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-rw-r--r--net/decnet/Kconfig27
-rw-r--r--net/decnet/Makefile10
-rw-r--r--net/decnet/README8
-rw-r--r--net/decnet/TODO41
-rw-r--r--net/decnet/af_decnet.c2405
-rw-r--r--net/decnet/dn_dev.c1481
-rw-r--r--net/decnet/dn_fib.c802
-rw-r--r--net/decnet/dn_neigh.c627
-rw-r--r--net/decnet/dn_nsp_in.c934
-rw-r--r--net/decnet/dn_nsp_out.c782
-rw-r--r--net/decnet/dn_route.c1840
-rw-r--r--net/decnet/dn_rules.c416
-rw-r--r--net/decnet/dn_table.c825
-rw-r--r--net/decnet/dn_timer.c109
-rw-r--r--net/decnet/netfilter/Kconfig15
-rw-r--r--net/decnet/netfilter/Makefile6
-rw-r--r--net/decnet/netfilter/dn_rtmsg.c167
-rw-r--r--net/decnet/sysctl_net_decnet.c480
18 files changed, 10975 insertions, 0 deletions
diff --git a/net/decnet/Kconfig b/net/decnet/Kconfig
new file mode 100644
index 000000000000..2101da542ba8
--- /dev/null
+++ b/net/decnet/Kconfig
@@ -0,0 +1,27 @@
1#
2# DECnet configuration
3#
4config DECNET_ROUTER
5 bool "DECnet: router support (EXPERIMENTAL)"
6 depends on DECNET && EXPERIMENTAL
7 ---help---
8 Add support for turning your DECnet Endnode into a level 1 or 2
9 router. This is an experimental, but functional option. If you
10 do say Y here, then make sure that you also say Y to "Kernel/User
11 network link driver", "Routing messages" and "Network packet
12 filtering". The first two are required to allow configuration via
13 rtnetlink (you will need Alexey Kuznetsov's iproute2 package
14 from <ftp://ftp.tux.org/pub/net/ip-routing/>). The "Network packet
15 filtering" option will be required for the forthcoming routing daemon
16 to work.
17
18 See <file:Documentation/networking/decnet.txt> for more information.
19
20config DECNET_ROUTE_FWMARK
21 bool "DECnet: use FWMARK value as routing key (EXPERIMENTAL)"
22 depends on DECNET_ROUTER && NETFILTER
23 help
24 If you say Y here, you will be able to specify different routes for
25 packets with different FWMARK ("firewalling mark") values
26 (see ipchains(8), "-m" argument).
27
diff --git a/net/decnet/Makefile b/net/decnet/Makefile
new file mode 100644
index 000000000000..e44003af71f6
--- /dev/null
+++ b/net/decnet/Makefile
@@ -0,0 +1,10 @@
1
2obj-$(CONFIG_DECNET) += decnet.o
3
4decnet-y := af_decnet.o dn_nsp_in.o dn_nsp_out.o \
5 dn_route.o dn_dev.o dn_neigh.o dn_timer.o
6decnet-$(CONFIG_DECNET_ROUTER) += dn_fib.o dn_rules.o dn_table.o
7decnet-y += sysctl_net_decnet.o
8
9obj-$(CONFIG_NETFILTER) += netfilter/
10
diff --git a/net/decnet/README b/net/decnet/README
new file mode 100644
index 000000000000..60e7ec88c81f
--- /dev/null
+++ b/net/decnet/README
@@ -0,0 +1,8 @@
1 Linux DECnet Project
2 ======================
3
4The documentation for this kernel subsystem is available in the
5Documentation/networking subdirectory of this distribution and also
6on line at http://www.chygwyn.com/DECnet/
7
8Steve Whitehouse <SteveW@ACM.org>
diff --git a/net/decnet/TODO b/net/decnet/TODO
new file mode 100644
index 000000000000..ebb5ac69d128
--- /dev/null
+++ b/net/decnet/TODO
@@ -0,0 +1,41 @@
1Steve's quick list of things that need finishing off:
2[they are in no particular order and range from the trivial to the long winded]
3
4 o Proper timeouts on each neighbour (in routing mode) rather than
5 just the 60 second On-Ethernet cache value.
6
7 o Support for X.25 linklayer
8
9 o Support for DDCMP link layer
10
11 o The DDCMP device itself
12
13 o PPP support (rfc1762)
14
15 o Lots of testing with real applications
16
17 o Verify errors etc. against POSIX 1003.1g (draft)
18
19 o Using send/recvmsg() to get at connect/disconnect data (POSIX 1003.1g)
20 [maybe this should be done at socket level... the control data in the
21 send/recvmsg() calls should simply be a vector of set/getsockopt()
22 calls]
23
24 o check MSG_CTRUNC is set where it should be.
25
26 o Find all the commonality between DECnet and IPv4 routing code and extract
27 it into a small library of routines. [probably a project for 2.7.xx]
28
29 o Add perfect socket hashing - an idea suggested by Paul Koning. Currently
30 we have a half-way house scheme which seems to work reasonably well, but
31 the full scheme is still worth implementing, its not not top of my list
32 right now.
33
34 o Add session control message flow control
35
36 o Add NSP message flow control
37
38 o DECnet sendpages() function
39
40 o AIO for DECnet
41
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
new file mode 100644
index 000000000000..29bb3cd21965
--- /dev/null
+++ b/net/decnet/af_decnet.c
@@ -0,0 +1,2405 @@
1
2/*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet Socket Layer Interface
8 *
9 * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
10 * Patrick Caulfield <patrick@pandh.demon.co.uk>
11 *
12 * Changes:
13 * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
14 * version of the code. Original copyright preserved
15 * below.
16 * Steve Whitehouse: Some bug fixes, cleaning up some code to make it
17 * compatible with my routing layer.
18 * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
19 * Caulfield.
20 * Steve Whitehouse: Further bug fixes, checking module code still works
21 * with new routing layer.
22 * Steve Whitehouse: Additional set/get_sockopt() calls.
23 * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
24 * code.
25 * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
26 * way. Didn't manage it entirely, but its better.
27 * Steve Whitehouse: ditto for sendmsg().
28 * Steve Whitehouse: A selection of bug fixes to various things.
29 * Steve Whitehouse: Added TIOCOUTQ ioctl.
30 * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
31 * Steve Whitehouse: Fixes to connect() error returns.
32 * Patrick Caulfield: Fixes to delayed acceptance logic.
33 * David S. Miller: New socket locking
34 * Steve Whitehouse: Socket list hashing/locking
35 * Arnaldo C. Melo: use capable, not suser
36 * Steve Whitehouse: Removed unused code. Fix to use sk->allocation
37 * when required.
38 * Patrick Caulfield: /proc/net/decnet now has object name/number
39 * Steve Whitehouse: Fixed local port allocation, hashed sk list
40 * Matthew Wilcox: Fixes for dn_ioctl()
41 * Steve Whitehouse: New connect/accept logic to allow timeouts and
42 * prepare for sendpage etc.
43 */
44
45
46/******************************************************************************
47 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
48
49 This program is free software; you can redistribute it and/or modify
50 it under the terms of the GNU General Public License as published by
51 the Free Software Foundation; either version 2 of the License, or
52 any later version.
53
54 This program is distributed in the hope that it will be useful,
55 but WITHOUT ANY WARRANTY; without even the implied warranty of
56 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
57 GNU General Public License for more details.
58
59HISTORY:
60
61Version Kernel Date Author/Comments
62------- ------ ---- ---------------
63Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
64 (emserrat@geocities.com)
65
66 First Development of DECnet Socket La-
67 yer for Linux. Only supports outgoing
68 connections.
69
70Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
71 (patrick@pandh.demon.co.uk)
72
73 Port to new kernel development version.
74
75Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
76 (emserrat@geocities.com)
77 _
78 Added support for incoming connections
79 so we can start developing server apps
80 on Linux.
81 -
82 Module Support
83Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
84 (emserrat@geocities.com)
85 _
86 Added support for X11R6.4. Now we can
87 use DECnet transport for X on Linux!!!
88 -
89Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
90 (emserrat@geocities.com)
91 Removed bugs on flow control
92 Removed bugs on incoming accessdata
93 order
94 -
95Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
96 dn_recvmsg fixes
97
98 Patrick J. Caulfield
99 dn_bind fixes
100*******************************************************************************/
101
102#include <linux/config.h>
103#include <linux/module.h>
104#include <linux/errno.h>
105#include <linux/types.h>
106#include <linux/slab.h>
107#include <linux/socket.h>
108#include <linux/in.h>
109#include <linux/kernel.h>
110#include <linux/sched.h>
111#include <linux/timer.h>
112#include <linux/string.h>
113#include <linux/sockios.h>
114#include <linux/net.h>
115#include <linux/netdevice.h>
116#include <linux/inet.h>
117#include <linux/route.h>
118#include <linux/netfilter.h>
119#include <linux/seq_file.h>
120#include <net/sock.h>
121#include <net/tcp.h>
122#include <net/flow.h>
123#include <asm/system.h>
124#include <asm/ioctls.h>
125#include <linux/mm.h>
126#include <linux/interrupt.h>
127#include <linux/proc_fs.h>
128#include <linux/stat.h>
129#include <linux/init.h>
130#include <linux/poll.h>
131#include <net/neighbour.h>
132#include <net/dst.h>
133#include <net/dn.h>
134#include <net/dn_nsp.h>
135#include <net/dn_dev.h>
136#include <net/dn_route.h>
137#include <net/dn_fib.h>
138#include <net/dn_neigh.h>
139
140struct dn_sock {
141 struct sock sk;
142 struct dn_scp scp;
143};
144
145static void dn_keepalive(struct sock *sk);
146
147#define DN_SK_HASH_SHIFT 8
148#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
149#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
150
151
152static struct proto_ops dn_proto_ops;
153static DEFINE_RWLOCK(dn_hash_lock);
154static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
155static struct hlist_head dn_wild_sk;
156
157static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
158static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
159
160static struct hlist_head *dn_find_list(struct sock *sk)
161{
162 struct dn_scp *scp = DN_SK(sk);
163
164 if (scp->addr.sdn_flags & SDF_WILD)
165 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
166
167 return &dn_sk_hash[scp->addrloc & DN_SK_HASH_MASK];
168}
169
170/*
171 * Valid ports are those greater than zero and not already in use.
172 */
173static int check_port(unsigned short port)
174{
175 struct sock *sk;
176 struct hlist_node *node;
177
178 if (port == 0)
179 return -1;
180
181 sk_for_each(sk, node, &dn_sk_hash[port & DN_SK_HASH_MASK]) {
182 struct dn_scp *scp = DN_SK(sk);
183 if (scp->addrloc == port)
184 return -1;
185 }
186 return 0;
187}
188
189static unsigned short port_alloc(struct sock *sk)
190{
191 struct dn_scp *scp = DN_SK(sk);
192static unsigned short port = 0x2000;
193 unsigned short i_port = port;
194
195 while(check_port(++port) != 0) {
196 if (port == i_port)
197 return 0;
198 }
199
200 scp->addrloc = port;
201
202 return 1;
203}
204
205/*
206 * Since this is only ever called from user
207 * level, we don't need a write_lock() version
208 * of this.
209 */
210static int dn_hash_sock(struct sock *sk)
211{
212 struct dn_scp *scp = DN_SK(sk);
213 struct hlist_head *list;
214 int rv = -EUSERS;
215
216 BUG_ON(sk_hashed(sk));
217
218 write_lock_bh(&dn_hash_lock);
219
220 if (!scp->addrloc && !port_alloc(sk))
221 goto out;
222
223 rv = -EADDRINUSE;
224 if ((list = dn_find_list(sk)) == NULL)
225 goto out;
226
227 sk_add_node(sk, list);
228 rv = 0;
229out:
230 write_unlock_bh(&dn_hash_lock);
231 return rv;
232}
233
234static void dn_unhash_sock(struct sock *sk)
235{
236 write_lock(&dn_hash_lock);
237 sk_del_node_init(sk);
238 write_unlock(&dn_hash_lock);
239}
240
241static void dn_unhash_sock_bh(struct sock *sk)
242{
243 write_lock_bh(&dn_hash_lock);
244 sk_del_node_init(sk);
245 write_unlock_bh(&dn_hash_lock);
246}
247
248static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
249{
250 int i;
251 unsigned hash = addr->sdn_objnum;
252
253 if (hash == 0) {
254 hash = addr->sdn_objnamel;
255 for(i = 0; i < dn_ntohs(addr->sdn_objnamel); i++) {
256 hash ^= addr->sdn_objname[i];
257 hash ^= (hash << 3);
258 }
259 }
260
261 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
262}
263
264/*
265 * Called to transform a socket from bound (i.e. with a local address)
266 * into a listening socket (doesn't need a local port number) and rehashes
267 * based upon the object name/number.
268 */
269static void dn_rehash_sock(struct sock *sk)
270{
271 struct hlist_head *list;
272 struct dn_scp *scp = DN_SK(sk);
273
274 if (scp->addr.sdn_flags & SDF_WILD)
275 return;
276
277 write_lock_bh(&dn_hash_lock);
278 sk_del_node_init(sk);
279 DN_SK(sk)->addrloc = 0;
280 list = listen_hash(&DN_SK(sk)->addr);
281 sk_add_node(sk, list);
282 write_unlock_bh(&dn_hash_lock);
283}
284
285int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
286{
287 int len = 2;
288
289 *buf++ = type;
290
291 switch(type) {
292 case 0:
293 *buf++ = sdn->sdn_objnum;
294 break;
295 case 1:
296 *buf++ = 0;
297 *buf++ = dn_ntohs(sdn->sdn_objnamel);
298 memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
299 len = 3 + dn_ntohs(sdn->sdn_objnamel);
300 break;
301 case 2:
302 memset(buf, 0, 5);
303 buf += 5;
304 *buf++ = dn_ntohs(sdn->sdn_objnamel);
305 memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
306 len = 7 + dn_ntohs(sdn->sdn_objnamel);
307 break;
308 }
309
310 return len;
311}
312
313/*
314 * On reception of usernames, we handle types 1 and 0 for destination
315 * addresses only. Types 2 and 4 are used for source addresses, but the
316 * UIC, GIC are ignored and they are both treated the same way. Type 3
317 * is never used as I've no idea what its purpose might be or what its
318 * format is.
319 */
320int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
321{
322 unsigned char type;
323 int size = len;
324 int namel = 12;
325
326 sdn->sdn_objnum = 0;
327 sdn->sdn_objnamel = dn_htons(0);
328 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
329
330 if (len < 2)
331 return -1;
332
333 len -= 2;
334 *fmt = *data++;
335 type = *data++;
336
337 switch(*fmt) {
338 case 0:
339 sdn->sdn_objnum = type;
340 return 2;
341 case 1:
342 namel = 16;
343 break;
344 case 2:
345 len -= 4;
346 data += 4;
347 break;
348 case 4:
349 len -= 8;
350 data += 8;
351 break;
352 default:
353 return -1;
354 }
355
356 len -= 1;
357
358 if (len < 0)
359 return -1;
360
361 sdn->sdn_objnamel = dn_htons(*data++);
362 len -= dn_ntohs(sdn->sdn_objnamel);
363
364 if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
365 return -1;
366
367 memcpy(sdn->sdn_objname, data, dn_ntohs(sdn->sdn_objnamel));
368
369 return size - len;
370}
371
372struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
373{
374 struct hlist_head *list = listen_hash(addr);
375 struct hlist_node *node;
376 struct sock *sk;
377
378 read_lock(&dn_hash_lock);
379 sk_for_each(sk, node, list) {
380 struct dn_scp *scp = DN_SK(sk);
381 if (sk->sk_state != TCP_LISTEN)
382 continue;
383 if (scp->addr.sdn_objnum) {
384 if (scp->addr.sdn_objnum != addr->sdn_objnum)
385 continue;
386 } else {
387 if (addr->sdn_objnum)
388 continue;
389 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
390 continue;
391 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
392 continue;
393 }
394 sock_hold(sk);
395 read_unlock(&dn_hash_lock);
396 return sk;
397 }
398
399 sk = sk_head(&dn_wild_sk);
400 if (sk) {
401 if (sk->sk_state == TCP_LISTEN)
402 sock_hold(sk);
403 else
404 sk = NULL;
405 }
406
407 read_unlock(&dn_hash_lock);
408 return sk;
409}
410
411struct sock *dn_find_by_skb(struct sk_buff *skb)
412{
413 struct dn_skb_cb *cb = DN_SKB_CB(skb);
414 struct sock *sk;
415 struct hlist_node *node;
416 struct dn_scp *scp;
417
418 read_lock(&dn_hash_lock);
419 sk_for_each(sk, node, &dn_sk_hash[cb->dst_port & DN_SK_HASH_MASK]) {
420 scp = DN_SK(sk);
421 if (cb->src != dn_saddr2dn(&scp->peer))
422 continue;
423 if (cb->dst_port != scp->addrloc)
424 continue;
425 if (scp->addrrem && (cb->src_port != scp->addrrem))
426 continue;
427 sock_hold(sk);
428 goto found;
429 }
430 sk = NULL;
431found:
432 read_unlock(&dn_hash_lock);
433 return sk;
434}
435
436
437
438static void dn_destruct(struct sock *sk)
439{
440 struct dn_scp *scp = DN_SK(sk);
441
442 skb_queue_purge(&scp->data_xmit_queue);
443 skb_queue_purge(&scp->other_xmit_queue);
444 skb_queue_purge(&scp->other_receive_queue);
445
446 dst_release(xchg(&sk->sk_dst_cache, NULL));
447}
448
449static struct proto dn_proto = {
450 .name = "DECNET",
451 .owner = THIS_MODULE,
452 .obj_size = sizeof(struct dn_sock),
453};
454
455static struct sock *dn_alloc_sock(struct socket *sock, int gfp)
456{
457 struct dn_scp *scp;
458 struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
459
460 if (!sk)
461 goto out;
462
463 if (sock)
464 sock->ops = &dn_proto_ops;
465 sock_init_data(sock, sk);
466
467 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
468 sk->sk_destruct = dn_destruct;
469 sk->sk_no_check = 1;
470 sk->sk_family = PF_DECnet;
471 sk->sk_protocol = 0;
472 sk->sk_allocation = gfp;
473
474 /* Initialization of DECnet Session Control Port */
475 scp = DN_SK(sk);
476 scp->state = DN_O; /* Open */
477 scp->numdat = 1; /* Next data seg to tx */
478 scp->numoth = 1; /* Next oth data to tx */
479 scp->ackxmt_dat = 0; /* Last data seg ack'ed */
480 scp->ackxmt_oth = 0; /* Last oth data ack'ed */
481 scp->ackrcv_dat = 0; /* Highest data ack recv*/
482 scp->ackrcv_oth = 0; /* Last oth data ack rec*/
483 scp->flowrem_sw = DN_SEND;
484 scp->flowloc_sw = DN_SEND;
485 scp->flowrem_dat = 0;
486 scp->flowrem_oth = 1;
487 scp->flowloc_dat = 0;
488 scp->flowloc_oth = 1;
489 scp->services_rem = 0;
490 scp->services_loc = 1 | NSP_FC_NONE;
491 scp->info_rem = 0;
492 scp->info_loc = 0x03; /* NSP version 4.1 */
493 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
494 scp->nonagle = 0;
495 scp->multi_ireq = 1;
496 scp->accept_mode = ACC_IMMED;
497 scp->addr.sdn_family = AF_DECnet;
498 scp->peer.sdn_family = AF_DECnet;
499 scp->accessdata.acc_accl = 5;
500 memcpy(scp->accessdata.acc_acc, "LINUX", 5);
501
502 scp->max_window = NSP_MAX_WINDOW;
503 scp->snd_window = NSP_MIN_WINDOW;
504 scp->nsp_srtt = NSP_INITIAL_SRTT;
505 scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
506 scp->nsp_rxtshift = 0;
507
508 skb_queue_head_init(&scp->data_xmit_queue);
509 skb_queue_head_init(&scp->other_xmit_queue);
510 skb_queue_head_init(&scp->other_receive_queue);
511
512 scp->persist = 0;
513 scp->persist_fxn = NULL;
514 scp->keepalive = 10 * HZ;
515 scp->keepalive_fxn = dn_keepalive;
516
517 init_timer(&scp->delack_timer);
518 scp->delack_pending = 0;
519 scp->delack_fxn = dn_nsp_delayed_ack;
520
521 dn_start_slow_timer(sk);
522out:
523 return sk;
524}
525
526/*
527 * Keepalive timer.
528 * FIXME: Should respond to SO_KEEPALIVE etc.
529 */
530static void dn_keepalive(struct sock *sk)
531{
532 struct dn_scp *scp = DN_SK(sk);
533
534 /*
535 * By checking the other_data transmit queue is empty
536 * we are double checking that we are not sending too
537 * many of these keepalive frames.
538 */
539 if (skb_queue_len(&scp->other_xmit_queue) == 0)
540 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
541}
542
543
544/*
545 * Timer for shutdown/destroyed sockets.
546 * When socket is dead & no packets have been sent for a
547 * certain amount of time, they are removed by this
548 * routine. Also takes care of sending out DI & DC
549 * frames at correct times.
550 */
551int dn_destroy_timer(struct sock *sk)
552{
553 struct dn_scp *scp = DN_SK(sk);
554
555 scp->persist = dn_nsp_persist(sk);
556
557 switch(scp->state) {
558 case DN_DI:
559 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
560 if (scp->nsp_rxtshift >= decnet_di_count)
561 scp->state = DN_CN;
562 return 0;
563
564 case DN_DR:
565 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
566 if (scp->nsp_rxtshift >= decnet_dr_count)
567 scp->state = DN_DRC;
568 return 0;
569
570 case DN_DN:
571 if (scp->nsp_rxtshift < decnet_dn_count) {
572 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
573 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
574 return 0;
575 }
576 }
577
578 scp->persist = (HZ * decnet_time_wait);
579
580 if (sk->sk_socket)
581 return 0;
582
583 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
584 dn_unhash_sock(sk);
585 sock_put(sk);
586 return 1;
587 }
588
589 return 0;
590}
591
592static void dn_destroy_sock(struct sock *sk)
593{
594 struct dn_scp *scp = DN_SK(sk);
595
596 scp->nsp_rxtshift = 0; /* reset back off */
597
598 if (sk->sk_socket) {
599 if (sk->sk_socket->state != SS_UNCONNECTED)
600 sk->sk_socket->state = SS_DISCONNECTING;
601 }
602
603 sk->sk_state = TCP_CLOSE;
604
605 switch(scp->state) {
606 case DN_DN:
607 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
608 sk->sk_allocation);
609 scp->persist_fxn = dn_destroy_timer;
610 scp->persist = dn_nsp_persist(sk);
611 break;
612 case DN_CR:
613 scp->state = DN_DR;
614 goto disc_reject;
615 case DN_RUN:
616 scp->state = DN_DI;
617 case DN_DI:
618 case DN_DR:
619disc_reject:
620 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
621 case DN_NC:
622 case DN_NR:
623 case DN_RJ:
624 case DN_DIC:
625 case DN_CN:
626 case DN_DRC:
627 case DN_CI:
628 case DN_CD:
629 scp->persist_fxn = dn_destroy_timer;
630 scp->persist = dn_nsp_persist(sk);
631 break;
632 default:
633 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
634 case DN_O:
635 dn_stop_slow_timer(sk);
636
637 dn_unhash_sock_bh(sk);
638 sock_put(sk);
639
640 break;
641 }
642}
643
644char *dn_addr2asc(dn_address addr, char *buf)
645{
646 unsigned short node, area;
647
648 node = addr & 0x03ff;
649 area = addr >> 10;
650 sprintf(buf, "%hd.%hd", area, node);
651
652 return buf;
653}
654
655
656
657static int dn_create(struct socket *sock, int protocol)
658{
659 struct sock *sk;
660
661 switch(sock->type) {
662 case SOCK_SEQPACKET:
663 if (protocol != DNPROTO_NSP)
664 return -EPROTONOSUPPORT;
665 break;
666 case SOCK_STREAM:
667 break;
668 default:
669 return -ESOCKTNOSUPPORT;
670 }
671
672
673 if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
674 return -ENOBUFS;
675
676 sk->sk_protocol = protocol;
677
678 return 0;
679}
680
681
682static int
683dn_release(struct socket *sock)
684{
685 struct sock *sk = sock->sk;
686
687 if (sk) {
688 sock_orphan(sk);
689 sock_hold(sk);
690 lock_sock(sk);
691 dn_destroy_sock(sk);
692 release_sock(sk);
693 sock_put(sk);
694 }
695
696 return 0;
697}
698
699static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
700{
701 struct sock *sk = sock->sk;
702 struct dn_scp *scp = DN_SK(sk);
703 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
704 struct net_device *dev;
705 int rv;
706
707 if (addr_len != sizeof(struct sockaddr_dn))
708 return -EINVAL;
709
710 if (saddr->sdn_family != AF_DECnet)
711 return -EINVAL;
712
713 if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
714 return -EINVAL;
715
716 if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
717 return -EINVAL;
718
719 if (saddr->sdn_flags & ~SDF_WILD)
720 return -EINVAL;
721
722#if 1
723 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
724 (saddr->sdn_flags & SDF_WILD)))
725 return -EACCES;
726#else
727 /*
728 * Maybe put the default actions in the default security ops for
729 * dn_prot_sock ? Would be nice if the capable call would go there
730 * too.
731 */
732 if (security_dn_prot_sock(saddr) &&
733 !capable(CAP_NET_BIND_SERVICE) ||
734 saddr->sdn_objnum || (saddr->sdn_flags & SDF_WILD))
735 return -EACCES;
736#endif
737
738
739 if (!(saddr->sdn_flags & SDF_WILD)) {
740 if (dn_ntohs(saddr->sdn_nodeaddrl)) {
741 read_lock(&dev_base_lock);
742 for(dev = dev_base; dev; dev = dev->next) {
743 if (!dev->dn_ptr)
744 continue;
745 if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
746 break;
747 }
748 read_unlock(&dev_base_lock);
749 if (dev == NULL)
750 return -EADDRNOTAVAIL;
751 }
752 }
753
754 rv = -EINVAL;
755 lock_sock(sk);
756 if (sock_flag(sk, SOCK_ZAPPED)) {
757 memcpy(&scp->addr, saddr, addr_len);
758 sock_reset_flag(sk, SOCK_ZAPPED);
759
760 rv = dn_hash_sock(sk);
761 if (rv)
762 sock_set_flag(sk, SOCK_ZAPPED);
763 }
764 release_sock(sk);
765
766 return rv;
767}
768
769
770static int dn_auto_bind(struct socket *sock)
771{
772 struct sock *sk = sock->sk;
773 struct dn_scp *scp = DN_SK(sk);
774 int rv;
775
776 sock_reset_flag(sk, SOCK_ZAPPED);
777
778 scp->addr.sdn_flags = 0;
779 scp->addr.sdn_objnum = 0;
780
781 /*
782 * This stuff is to keep compatibility with Eduardo's
783 * patch. I hope I can dispense with it shortly...
784 */
785 if ((scp->accessdata.acc_accl != 0) &&
786 (scp->accessdata.acc_accl <= 12)) {
787
788 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
789 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
790
791 scp->accessdata.acc_accl = 0;
792 memset(scp->accessdata.acc_acc, 0, 40);
793 }
794 /* End of compatibility stuff */
795
796 scp->addr.sdn_add.a_len = dn_htons(2);
797 rv = dn_dev_bind_default((dn_address *)scp->addr.sdn_add.a_addr);
798 if (rv == 0) {
799 rv = dn_hash_sock(sk);
800 if (rv)
801 sock_set_flag(sk, SOCK_ZAPPED);
802 }
803
804 return rv;
805}
806
807static int dn_confirm_accept(struct sock *sk, long *timeo, int allocation)
808{
809 struct dn_scp *scp = DN_SK(sk);
810 DEFINE_WAIT(wait);
811 int err;
812
813 if (scp->state != DN_CR)
814 return -EINVAL;
815
816 scp->state = DN_CC;
817 scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
818 dn_send_conn_conf(sk, allocation);
819
820 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
821 for(;;) {
822 release_sock(sk);
823 if (scp->state == DN_CC)
824 *timeo = schedule_timeout(*timeo);
825 lock_sock(sk);
826 err = 0;
827 if (scp->state == DN_RUN)
828 break;
829 err = sock_error(sk);
830 if (err)
831 break;
832 err = sock_intr_errno(*timeo);
833 if (signal_pending(current))
834 break;
835 err = -EAGAIN;
836 if (!*timeo)
837 break;
838 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
839 }
840 finish_wait(sk->sk_sleep, &wait);
841 if (err == 0) {
842 sk->sk_socket->state = SS_CONNECTED;
843 } else if (scp->state != DN_CC) {
844 sk->sk_socket->state = SS_UNCONNECTED;
845 }
846 return err;
847}
848
849static int dn_wait_run(struct sock *sk, long *timeo)
850{
851 struct dn_scp *scp = DN_SK(sk);
852 DEFINE_WAIT(wait);
853 int err = 0;
854
855 if (scp->state == DN_RUN)
856 goto out;
857
858 if (!*timeo)
859 return -EALREADY;
860
861 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
862 for(;;) {
863 release_sock(sk);
864 if (scp->state == DN_CI || scp->state == DN_CC)
865 *timeo = schedule_timeout(*timeo);
866 lock_sock(sk);
867 err = 0;
868 if (scp->state == DN_RUN)
869 break;
870 err = sock_error(sk);
871 if (err)
872 break;
873 err = sock_intr_errno(*timeo);
874 if (signal_pending(current))
875 break;
876 err = -ETIMEDOUT;
877 if (!*timeo)
878 break;
879 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
880 }
881 finish_wait(sk->sk_sleep, &wait);
882out:
883 if (err == 0) {
884 sk->sk_socket->state = SS_CONNECTED;
885 } else if (scp->state != DN_CI && scp->state != DN_CC) {
886 sk->sk_socket->state = SS_UNCONNECTED;
887 }
888 return err;
889}
890
891static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
892{
893 struct socket *sock = sk->sk_socket;
894 struct dn_scp *scp = DN_SK(sk);
895 int err = -EISCONN;
896 struct flowi fl;
897
898 if (sock->state == SS_CONNECTED)
899 goto out;
900
901 if (sock->state == SS_CONNECTING) {
902 err = 0;
903 if (scp->state == DN_RUN) {
904 sock->state = SS_CONNECTED;
905 goto out;
906 }
907 err = -ECONNREFUSED;
908 if (scp->state != DN_CI && scp->state != DN_CC) {
909 sock->state = SS_UNCONNECTED;
910 goto out;
911 }
912 return dn_wait_run(sk, timeo);
913 }
914
915 err = -EINVAL;
916 if (scp->state != DN_O)
917 goto out;
918
919 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
920 goto out;
921 if (addr->sdn_family != AF_DECnet)
922 goto out;
923 if (addr->sdn_flags & SDF_WILD)
924 goto out;
925
926 if (sock_flag(sk, SOCK_ZAPPED)) {
927 err = dn_auto_bind(sk->sk_socket);
928 if (err)
929 goto out;
930 }
931
932 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
933
934 err = -EHOSTUNREACH;
935 memset(&fl, 0, sizeof(fl));
936 fl.oif = sk->sk_bound_dev_if;
937 fl.fld_dst = dn_saddr2dn(&scp->peer);
938 fl.fld_src = dn_saddr2dn(&scp->addr);
939 dn_sk_ports_copy(&fl, scp);
940 fl.proto = DNPROTO_NSP;
941 if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
942 goto out;
943 sk->sk_route_caps = sk->sk_dst_cache->dev->features;
944 sock->state = SS_CONNECTING;
945 scp->state = DN_CI;
946 scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
947
948 dn_nsp_send_conninit(sk, NSP_CI);
949 err = -EINPROGRESS;
950 if (*timeo) {
951 err = dn_wait_run(sk, timeo);
952 }
953out:
954 return err;
955}
956
957static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
958{
959 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
960 struct sock *sk = sock->sk;
961 int err;
962 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
963
964 lock_sock(sk);
965 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
966 release_sock(sk);
967
968 return err;
969}
970
971static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
972{
973 struct dn_scp *scp = DN_SK(sk);
974
975 switch(scp->state) {
976 case DN_RUN:
977 return 0;
978 case DN_CR:
979 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
980 case DN_CI:
981 case DN_CC:
982 return dn_wait_run(sk, timeo);
983 case DN_O:
984 return __dn_connect(sk, addr, addrlen, timeo, flags);
985 }
986
987 return -EINVAL;
988}
989
990
991static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
992{
993 unsigned char *ptr = skb->data;
994
995 acc->acc_userl = *ptr++;
996 memcpy(&acc->acc_user, ptr, acc->acc_userl);
997 ptr += acc->acc_userl;
998
999 acc->acc_passl = *ptr++;
1000 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1001 ptr += acc->acc_passl;
1002
1003 acc->acc_accl = *ptr++;
1004 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1005
1006 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1007
1008}
1009
1010static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1011{
1012 unsigned char *ptr = skb->data;
1013
1014 opt->opt_optl = *ptr++;
1015 opt->opt_status = 0;
1016 memcpy(opt->opt_data, ptr, opt->opt_optl);
1017 skb_pull(skb, opt->opt_optl + 1);
1018
1019}
1020
1021static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1022{
1023 DEFINE_WAIT(wait);
1024 struct sk_buff *skb = NULL;
1025 int err = 0;
1026
1027 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1028 for(;;) {
1029 release_sock(sk);
1030 skb = skb_dequeue(&sk->sk_receive_queue);
1031 if (skb == NULL) {
1032 *timeo = schedule_timeout(*timeo);
1033 skb = skb_dequeue(&sk->sk_receive_queue);
1034 }
1035 lock_sock(sk);
1036 if (skb != NULL)
1037 break;
1038 err = -EINVAL;
1039 if (sk->sk_state != TCP_LISTEN)
1040 break;
1041 err = sock_intr_errno(*timeo);
1042 if (signal_pending(current))
1043 break;
1044 err = -EAGAIN;
1045 if (!*timeo)
1046 break;
1047 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1048 }
1049 finish_wait(sk->sk_sleep, &wait);
1050
1051 return skb == NULL ? ERR_PTR(err) : skb;
1052}
1053
1054static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1055{
1056 struct sock *sk = sock->sk, *newsk;
1057 struct sk_buff *skb = NULL;
1058 struct dn_skb_cb *cb;
1059 unsigned char menuver;
1060 int err = 0;
1061 unsigned char type;
1062 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1063
1064 lock_sock(sk);
1065
1066 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1067 release_sock(sk);
1068 return -EINVAL;
1069 }
1070
1071 skb = skb_dequeue(&sk->sk_receive_queue);
1072 if (skb == NULL) {
1073 skb = dn_wait_for_connect(sk, &timeo);
1074 if (IS_ERR(skb)) {
1075 release_sock(sk);
1076 return PTR_ERR(skb);
1077 }
1078 }
1079
1080 cb = DN_SKB_CB(skb);
1081 sk->sk_ack_backlog--;
1082 newsk = dn_alloc_sock(newsock, sk->sk_allocation);
1083 if (newsk == NULL) {
1084 release_sock(sk);
1085 kfree_skb(skb);
1086 return -ENOBUFS;
1087 }
1088 release_sock(sk);
1089
1090 dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1091 skb->dst = NULL;
1092
1093 DN_SK(newsk)->state = DN_CR;
1094 DN_SK(newsk)->addrrem = cb->src_port;
1095 DN_SK(newsk)->services_rem = cb->services;
1096 DN_SK(newsk)->info_rem = cb->info;
1097 DN_SK(newsk)->segsize_rem = cb->segsize;
1098 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1099
1100 if (DN_SK(newsk)->segsize_rem < 230)
1101 DN_SK(newsk)->segsize_rem = 230;
1102
1103 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1104 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1105
1106 newsk->sk_state = TCP_LISTEN;
1107 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1108
1109 /*
1110 * If we are listening on a wild socket, we don't want
1111 * the newly created socket on the wrong hash queue.
1112 */
1113 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1114
1115 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1116 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1117 *(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1118 *(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1119
1120 menuver = *skb->data;
1121 skb_pull(skb, 1);
1122
1123 if (menuver & DN_MENUVER_ACC)
1124 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1125
1126 if (menuver & DN_MENUVER_USR)
1127 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1128
1129 if (menuver & DN_MENUVER_PRX)
1130 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1131
1132 if (menuver & DN_MENUVER_UIC)
1133 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1134
1135 kfree_skb(skb);
1136
1137 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1138 sizeof(struct optdata_dn));
1139 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1140 sizeof(struct optdata_dn));
1141
1142 lock_sock(newsk);
1143 err = dn_hash_sock(newsk);
1144 if (err == 0) {
1145 sock_reset_flag(newsk, SOCK_ZAPPED);
1146 dn_send_conn_ack(newsk);
1147
1148 /*
1149 * Here we use sk->sk_allocation since although the conn conf is
1150 * for the newsk, the context is the old socket.
1151 */
1152 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1153 err = dn_confirm_accept(newsk, &timeo,
1154 sk->sk_allocation);
1155 }
1156 release_sock(newsk);
1157 return err;
1158}
1159
1160
1161static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1162{
1163 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1164 struct sock *sk = sock->sk;
1165 struct dn_scp *scp = DN_SK(sk);
1166
1167 *uaddr_len = sizeof(struct sockaddr_dn);
1168
1169 lock_sock(sk);
1170
1171 if (peer) {
1172 if ((sock->state != SS_CONNECTED &&
1173 sock->state != SS_CONNECTING) &&
1174 scp->accept_mode == ACC_IMMED)
1175 return -ENOTCONN;
1176
1177 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1178 } else {
1179 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1180 }
1181
1182 release_sock(sk);
1183
1184 return 0;
1185}
1186
1187
1188static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1189{
1190 struct sock *sk = sock->sk;
1191 struct dn_scp *scp = DN_SK(sk);
1192 int mask = datagram_poll(file, sock, wait);
1193
1194 if (skb_queue_len(&scp->other_receive_queue))
1195 mask |= POLLRDBAND;
1196
1197 return mask;
1198}
1199
1200static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1201{
1202 struct sock *sk = sock->sk;
1203 struct dn_scp *scp = DN_SK(sk);
1204 int err = -EOPNOTSUPP;
1205 long amount = 0;
1206 struct sk_buff *skb;
1207 int val;
1208
1209 switch(cmd)
1210 {
1211 case SIOCGIFADDR:
1212 case SIOCSIFADDR:
1213 return dn_dev_ioctl(cmd, (void __user *)arg);
1214
1215 case SIOCATMARK:
1216 lock_sock(sk);
1217 val = (skb_queue_len(&scp->other_receive_queue) != 0);
1218 if (scp->state != DN_RUN)
1219 val = -ENOTCONN;
1220 release_sock(sk);
1221 return val;
1222
1223 case TIOCOUTQ:
1224 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1225 if (amount < 0)
1226 amount = 0;
1227 err = put_user(amount, (int __user *)arg);
1228 break;
1229
1230 case TIOCINQ:
1231 lock_sock(sk);
1232 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1233 amount = skb->len;
1234 } else {
1235 struct sk_buff *skb = sk->sk_receive_queue.next;
1236 for(;;) {
1237 if (skb ==
1238 (struct sk_buff *)&sk->sk_receive_queue)
1239 break;
1240 amount += skb->len;
1241 skb = skb->next;
1242 }
1243 }
1244 release_sock(sk);
1245 err = put_user(amount, (int __user *)arg);
1246 break;
1247
1248 default:
1249 err = dev_ioctl(cmd, (void __user *)arg);
1250 break;
1251 }
1252
1253 return err;
1254}
1255
1256static int dn_listen(struct socket *sock, int backlog)
1257{
1258 struct sock *sk = sock->sk;
1259 int err = -EINVAL;
1260
1261 lock_sock(sk);
1262
1263 if (sock_flag(sk, SOCK_ZAPPED))
1264 goto out;
1265
1266 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1267 goto out;
1268
1269 sk->sk_max_ack_backlog = backlog;
1270 sk->sk_ack_backlog = 0;
1271 sk->sk_state = TCP_LISTEN;
1272 err = 0;
1273 dn_rehash_sock(sk);
1274
1275out:
1276 release_sock(sk);
1277
1278 return err;
1279}
1280
1281
1282static int dn_shutdown(struct socket *sock, int how)
1283{
1284 struct sock *sk = sock->sk;
1285 struct dn_scp *scp = DN_SK(sk);
1286 int err = -ENOTCONN;
1287
1288 lock_sock(sk);
1289
1290 if (sock->state == SS_UNCONNECTED)
1291 goto out;
1292
1293 err = 0;
1294 if (sock->state == SS_DISCONNECTING)
1295 goto out;
1296
1297 err = -EINVAL;
1298 if (scp->state == DN_O)
1299 goto out;
1300
1301 if (how != SHUTDOWN_MASK)
1302 goto out;
1303
1304 sk->sk_shutdown = how;
1305 dn_destroy_sock(sk);
1306 err = 0;
1307
1308out:
1309 release_sock(sk);
1310
1311 return err;
1312}
1313
1314static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1315{
1316 struct sock *sk = sock->sk;
1317 int err;
1318
1319 lock_sock(sk);
1320 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1321 release_sock(sk);
1322
1323 return err;
1324}
1325
1326static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1327{
1328 struct sock *sk = sock->sk;
1329 struct dn_scp *scp = DN_SK(sk);
1330 long timeo;
1331 union {
1332 struct optdata_dn opt;
1333 struct accessdata_dn acc;
1334 int mode;
1335 unsigned long win;
1336 int val;
1337 unsigned char services;
1338 unsigned char info;
1339 } u;
1340 int err;
1341
1342 if (optlen && !optval)
1343 return -EINVAL;
1344
1345 if (optlen > sizeof(u))
1346 return -EINVAL;
1347
1348 if (copy_from_user(&u, optval, optlen))
1349 return -EFAULT;
1350
1351 switch(optname) {
1352 case DSO_CONDATA:
1353 if (sock->state == SS_CONNECTED)
1354 return -EISCONN;
1355 if ((scp->state != DN_O) && (scp->state != DN_CR))
1356 return -EINVAL;
1357
1358 if (optlen != sizeof(struct optdata_dn))
1359 return -EINVAL;
1360
1361 if (u.opt.opt_optl > 16)
1362 return -EINVAL;
1363
1364 memcpy(&scp->conndata_out, &u.opt, optlen);
1365 break;
1366
1367 case DSO_DISDATA:
1368 if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1369 return -ENOTCONN;
1370
1371 if (optlen != sizeof(struct optdata_dn))
1372 return -EINVAL;
1373
1374 if (u.opt.opt_optl > 16)
1375 return -EINVAL;
1376
1377 memcpy(&scp->discdata_out, &u.opt, optlen);
1378 break;
1379
1380 case DSO_CONACCESS:
1381 if (sock->state == SS_CONNECTED)
1382 return -EISCONN;
1383 if (scp->state != DN_O)
1384 return -EINVAL;
1385
1386 if (optlen != sizeof(struct accessdata_dn))
1387 return -EINVAL;
1388
1389 if ((u.acc.acc_accl > DN_MAXACCL) ||
1390 (u.acc.acc_passl > DN_MAXACCL) ||
1391 (u.acc.acc_userl > DN_MAXACCL))
1392 return -EINVAL;
1393
1394 memcpy(&scp->accessdata, &u.acc, optlen);
1395 break;
1396
1397 case DSO_ACCEPTMODE:
1398 if (sock->state == SS_CONNECTED)
1399 return -EISCONN;
1400 if (scp->state != DN_O)
1401 return -EINVAL;
1402
1403 if (optlen != sizeof(int))
1404 return -EINVAL;
1405
1406 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1407 return -EINVAL;
1408
1409 scp->accept_mode = (unsigned char)u.mode;
1410 break;
1411
1412 case DSO_CONACCEPT:
1413
1414 if (scp->state != DN_CR)
1415 return -EINVAL;
1416 timeo = sock_rcvtimeo(sk, 0);
1417 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1418 return err;
1419
1420 case DSO_CONREJECT:
1421
1422 if (scp->state != DN_CR)
1423 return -EINVAL;
1424
1425 scp->state = DN_DR;
1426 sk->sk_shutdown = SHUTDOWN_MASK;
1427 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1428 break;
1429
1430 default:
1431#ifdef CONFIG_NETFILTER
1432 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1433#endif
1434 case DSO_LINKINFO:
1435 case DSO_STREAM:
1436 case DSO_SEQPACKET:
1437 return -ENOPROTOOPT;
1438
1439 case DSO_MAXWINDOW:
1440 if (optlen != sizeof(unsigned long))
1441 return -EINVAL;
1442 if (u.win > NSP_MAX_WINDOW)
1443 u.win = NSP_MAX_WINDOW;
1444 if (u.win == 0)
1445 return -EINVAL;
1446 scp->max_window = u.win;
1447 if (scp->snd_window > u.win)
1448 scp->snd_window = u.win;
1449 break;
1450
1451 case DSO_NODELAY:
1452 if (optlen != sizeof(int))
1453 return -EINVAL;
1454 if (scp->nonagle == 2)
1455 return -EINVAL;
1456 scp->nonagle = (u.val == 0) ? 0 : 1;
1457 /* if (scp->nonagle == 1) { Push pending frames } */
1458 break;
1459
1460 case DSO_CORK:
1461 if (optlen != sizeof(int))
1462 return -EINVAL;
1463 if (scp->nonagle == 1)
1464 return -EINVAL;
1465 scp->nonagle = (u.val == 0) ? 0 : 2;
1466 /* if (scp->nonagle == 0) { Push pending frames } */
1467 break;
1468
1469 case DSO_SERVICES:
1470 if (optlen != sizeof(unsigned char))
1471 return -EINVAL;
1472 if ((u.services & ~NSP_FC_MASK) != 0x01)
1473 return -EINVAL;
1474 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1475 return -EINVAL;
1476 scp->services_loc = u.services;
1477 break;
1478
1479 case DSO_INFO:
1480 if (optlen != sizeof(unsigned char))
1481 return -EINVAL;
1482 if (u.info & 0xfc)
1483 return -EINVAL;
1484 scp->info_loc = u.info;
1485 break;
1486 }
1487
1488 return 0;
1489}
1490
1491static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1492{
1493 struct sock *sk = sock->sk;
1494 int err;
1495
1496 lock_sock(sk);
1497 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1498 release_sock(sk);
1499
1500 return err;
1501}
1502
1503static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1504{
1505 struct sock *sk = sock->sk;
1506 struct dn_scp *scp = DN_SK(sk);
1507 struct linkinfo_dn link;
1508 unsigned int r_len;
1509 void *r_data = NULL;
1510 unsigned int val;
1511
1512 if(get_user(r_len , optlen))
1513 return -EFAULT;
1514
1515 switch(optname) {
1516 case DSO_CONDATA:
1517 if (r_len > sizeof(struct optdata_dn))
1518 r_len = sizeof(struct optdata_dn);
1519 r_data = &scp->conndata_in;
1520 break;
1521
1522 case DSO_DISDATA:
1523 if (r_len > sizeof(struct optdata_dn))
1524 r_len = sizeof(struct optdata_dn);
1525 r_data = &scp->discdata_in;
1526 break;
1527
1528 case DSO_CONACCESS:
1529 if (r_len > sizeof(struct accessdata_dn))
1530 r_len = sizeof(struct accessdata_dn);
1531 r_data = &scp->accessdata;
1532 break;
1533
1534 case DSO_ACCEPTMODE:
1535 if (r_len > sizeof(unsigned char))
1536 r_len = sizeof(unsigned char);
1537 r_data = &scp->accept_mode;
1538 break;
1539
1540 case DSO_LINKINFO:
1541 if (r_len > sizeof(struct linkinfo_dn))
1542 r_len = sizeof(struct linkinfo_dn);
1543
1544 switch(sock->state) {
1545 case SS_CONNECTING:
1546 link.idn_linkstate = LL_CONNECTING;
1547 break;
1548 case SS_DISCONNECTING:
1549 link.idn_linkstate = LL_DISCONNECTING;
1550 break;
1551 case SS_CONNECTED:
1552 link.idn_linkstate = LL_RUNNING;
1553 break;
1554 default:
1555 link.idn_linkstate = LL_INACTIVE;
1556 }
1557
1558 link.idn_segsize = scp->segsize_rem;
1559 r_data = &link;
1560 break;
1561
1562 default:
1563#ifdef CONFIG_NETFILTER
1564 {
1565 int val, len;
1566
1567 if(get_user(len, optlen))
1568 return -EFAULT;
1569
1570 val = nf_getsockopt(sk, PF_DECnet, optname,
1571 optval, &len);
1572 if (val >= 0)
1573 val = put_user(len, optlen);
1574 return val;
1575 }
1576#endif
1577 case DSO_STREAM:
1578 case DSO_SEQPACKET:
1579 case DSO_CONACCEPT:
1580 case DSO_CONREJECT:
1581 return -ENOPROTOOPT;
1582
1583 case DSO_MAXWINDOW:
1584 if (r_len > sizeof(unsigned long))
1585 r_len = sizeof(unsigned long);
1586 r_data = &scp->max_window;
1587 break;
1588
1589 case DSO_NODELAY:
1590 if (r_len > sizeof(int))
1591 r_len = sizeof(int);
1592 val = (scp->nonagle == 1);
1593 r_data = &val;
1594 break;
1595
1596 case DSO_CORK:
1597 if (r_len > sizeof(int))
1598 r_len = sizeof(int);
1599 val = (scp->nonagle == 2);
1600 r_data = &val;
1601 break;
1602
1603 case DSO_SERVICES:
1604 if (r_len > sizeof(unsigned char))
1605 r_len = sizeof(unsigned char);
1606 r_data = &scp->services_rem;
1607 break;
1608
1609 case DSO_INFO:
1610 if (r_len > sizeof(unsigned char))
1611 r_len = sizeof(unsigned char);
1612 r_data = &scp->info_rem;
1613 break;
1614 }
1615
1616 if (r_data) {
1617 if (copy_to_user(optval, r_data, r_len))
1618 return -EFAULT;
1619 if (put_user(r_len, optlen))
1620 return -EFAULT;
1621 }
1622
1623 return 0;
1624}
1625
1626
1627static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1628{
1629 struct sk_buff *skb = q->next;
1630 int len = 0;
1631
1632 if (flags & MSG_OOB)
1633 return skb_queue_len(q) ? 1 : 0;
1634
1635 while(skb != (struct sk_buff *)q) {
1636 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1637 len += skb->len;
1638
1639 if (cb->nsp_flags & 0x40) {
1640 /* SOCK_SEQPACKET reads to EOM */
1641 if (sk->sk_type == SOCK_SEQPACKET)
1642 return 1;
1643 /* so does SOCK_STREAM unless WAITALL is specified */
1644 if (!(flags & MSG_WAITALL))
1645 return 1;
1646 }
1647
1648 /* minimum data length for read exceeded */
1649 if (len >= target)
1650 return 1;
1651
1652 skb = skb->next;
1653 }
1654
1655 return 0;
1656}
1657
1658
1659static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1660 struct msghdr *msg, size_t size, int flags)
1661{
1662 struct sock *sk = sock->sk;
1663 struct dn_scp *scp = DN_SK(sk);
1664 struct sk_buff_head *queue = &sk->sk_receive_queue;
1665 size_t target = size > 1 ? 1 : 0;
1666 size_t copied = 0;
1667 int rv = 0;
1668 struct sk_buff *skb, *nskb;
1669 struct dn_skb_cb *cb = NULL;
1670 unsigned char eor = 0;
1671 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1672
1673 lock_sock(sk);
1674
1675 if (sock_flag(sk, SOCK_ZAPPED)) {
1676 rv = -EADDRNOTAVAIL;
1677 goto out;
1678 }
1679
1680 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1681 if (rv)
1682 goto out;
1683
1684 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1685 if (!(flags & MSG_NOSIGNAL))
1686 send_sig(SIGPIPE, current, 0);
1687 rv = -EPIPE;
1688 goto out;
1689 }
1690
1691 if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1692 rv = -EOPNOTSUPP;
1693 goto out;
1694 }
1695
1696 if (flags & MSG_OOB)
1697 queue = &scp->other_receive_queue;
1698
1699 if (flags & MSG_WAITALL)
1700 target = size;
1701
1702
1703 /*
1704 * See if there is data ready to read, sleep if there isn't
1705 */
1706 for(;;) {
1707 if (sk->sk_err)
1708 goto out;
1709
1710 if (skb_queue_len(&scp->other_receive_queue)) {
1711 if (!(flags & MSG_OOB)) {
1712 msg->msg_flags |= MSG_OOB;
1713 if (!scp->other_report) {
1714 scp->other_report = 1;
1715 goto out;
1716 }
1717 }
1718 }
1719
1720 if (scp->state != DN_RUN)
1721 goto out;
1722
1723 if (signal_pending(current)) {
1724 rv = sock_intr_errno(timeo);
1725 goto out;
1726 }
1727
1728 if (dn_data_ready(sk, queue, flags, target))
1729 break;
1730
1731 if (flags & MSG_DONTWAIT) {
1732 rv = -EWOULDBLOCK;
1733 goto out;
1734 }
1735
1736 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1737 SOCK_SLEEP_PRE(sk)
1738
1739 if (!dn_data_ready(sk, queue, flags, target))
1740 schedule();
1741
1742 SOCK_SLEEP_POST(sk)
1743 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1744 }
1745
1746 for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1747 unsigned int chunk = skb->len;
1748 cb = DN_SKB_CB(skb);
1749
1750 if ((chunk + copied) > size)
1751 chunk = size - copied;
1752
1753 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1754 rv = -EFAULT;
1755 break;
1756 }
1757 copied += chunk;
1758
1759 if (!(flags & MSG_PEEK))
1760 skb_pull(skb, chunk);
1761
1762 eor = cb->nsp_flags & 0x40;
1763 nskb = skb->next;
1764
1765 if (skb->len == 0) {
1766 skb_unlink(skb);
1767 kfree_skb(skb);
1768 /*
1769 * N.B. Don't refer to skb or cb after this point
1770 * in loop.
1771 */
1772 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1773 scp->flowloc_sw = DN_SEND;
1774 dn_nsp_send_link(sk, DN_SEND, 0);
1775 }
1776 }
1777
1778 if (eor) {
1779 if (sk->sk_type == SOCK_SEQPACKET)
1780 break;
1781 if (!(flags & MSG_WAITALL))
1782 break;
1783 }
1784
1785 if (flags & MSG_OOB)
1786 break;
1787
1788 if (copied >= target)
1789 break;
1790 }
1791
1792 rv = copied;
1793
1794
1795 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1796 msg->msg_flags |= MSG_EOR;
1797
1798out:
1799 if (rv == 0)
1800 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1801
1802 if ((rv >= 0) && msg->msg_name) {
1803 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1804 msg->msg_namelen = sizeof(struct sockaddr_dn);
1805 }
1806
1807 release_sock(sk);
1808
1809 return rv;
1810}
1811
1812
1813static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1814{
1815 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1816 if (skb_queue_len(queue) >= scp->snd_window)
1817 return 1;
1818 if (fctype != NSP_FC_NONE) {
1819 if (flags & MSG_OOB) {
1820 if (scp->flowrem_oth == 0)
1821 return 1;
1822 } else {
1823 if (scp->flowrem_dat == 0)
1824 return 1;
1825 }
1826 }
1827 return 0;
1828}
1829
1830/*
1831 * The DECnet spec requires the the "routing layer" accepts packets which
1832 * are at least 230 bytes in size. This excludes any headers which the NSP
1833 * layer might add, so we always assume that we'll be using the maximal
1834 * length header on data packets. The variation in length is due to the
1835 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1836 * make much practical difference.
1837 */
1838unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1839{
1840 unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1841 if (dev) {
1842 struct dn_dev *dn_db = dev->dn_ptr;
1843 mtu -= LL_RESERVED_SPACE(dev);
1844 if (dn_db->use_long)
1845 mtu -= 21;
1846 else
1847 mtu -= 6;
1848 mtu -= DN_MAX_NSP_DATA_HEADER;
1849 } else {
1850 /*
1851 * 21 = long header, 16 = guess at MAC header length
1852 */
1853 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1854 }
1855 if (mtu > mss)
1856 mss = mtu;
1857 return mss;
1858}
1859
1860static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1861{
1862 struct dst_entry *dst = __sk_dst_get(sk);
1863 struct dn_scp *scp = DN_SK(sk);
1864 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1865
1866 /* Other data messages are limited to 16 bytes per packet */
1867 if (flags & MSG_OOB)
1868 return 16;
1869
1870 /* This works out the maximum size of segment we can send out */
1871 if (dst) {
1872 u32 mtu = dst_mtu(dst);
1873 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1874 }
1875
1876 return mss_now;
1877}
1878
1879static int dn_error(struct sock *sk, int flags, int err)
1880{
1881 if (err == -EPIPE)
1882 err = sock_error(sk) ? : -EPIPE;
1883 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1884 send_sig(SIGPIPE, current, 0);
1885 return err;
1886}
1887
1888static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1889 struct msghdr *msg, size_t size)
1890{
1891 struct sock *sk = sock->sk;
1892 struct dn_scp *scp = DN_SK(sk);
1893 size_t mss;
1894 struct sk_buff_head *queue = &scp->data_xmit_queue;
1895 int flags = msg->msg_flags;
1896 int err = 0;
1897 size_t sent = 0;
1898 int addr_len = msg->msg_namelen;
1899 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1900 struct sk_buff *skb = NULL;
1901 struct dn_skb_cb *cb;
1902 size_t len;
1903 unsigned char fctype;
1904 long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1905
1906 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1907 return -EOPNOTSUPP;
1908
1909 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1910 return -EINVAL;
1911
1912 /*
1913 * The only difference between stream sockets and sequenced packet
1914 * sockets is that the stream sockets always behave as if MSG_EOR
1915 * has been set.
1916 */
1917 if (sock->type == SOCK_STREAM) {
1918 if (flags & MSG_EOR)
1919 return -EINVAL;
1920 flags |= MSG_EOR;
1921 }
1922
1923 lock_sock(sk);
1924
1925 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1926 if (err)
1927 goto out_err;
1928
1929 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1930 err = -EPIPE;
1931 goto out_err;
1932 }
1933
1934 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1935 dst_negative_advice(&sk->sk_dst_cache);
1936
1937 mss = scp->segsize_rem;
1938 fctype = scp->services_rem & NSP_FC_MASK;
1939
1940 mss = dn_current_mss(sk, flags);
1941
1942 if (flags & MSG_OOB) {
1943 queue = &scp->other_xmit_queue;
1944 if (size > mss) {
1945 err = -EMSGSIZE;
1946 goto out;
1947 }
1948 }
1949
1950 scp->persist_fxn = dn_nsp_xmit_timeout;
1951
1952 while(sent < size) {
1953 err = sock_error(sk);
1954 if (err)
1955 goto out;
1956
1957 if (signal_pending(current)) {
1958 err = sock_intr_errno(timeo);
1959 goto out;
1960 }
1961
1962 /*
1963 * Calculate size that we wish to send.
1964 */
1965 len = size - sent;
1966
1967 if (len > mss)
1968 len = mss;
1969
1970 /*
1971 * Wait for queue size to go down below the window
1972 * size.
1973 */
1974 if (dn_queue_too_long(scp, queue, flags)) {
1975 if (flags & MSG_DONTWAIT) {
1976 err = -EWOULDBLOCK;
1977 goto out;
1978 }
1979
1980 SOCK_SLEEP_PRE(sk)
1981
1982 if (dn_queue_too_long(scp, queue, flags))
1983 schedule();
1984
1985 SOCK_SLEEP_POST(sk)
1986
1987 continue;
1988 }
1989
1990 /*
1991 * Get a suitably sized skb.
1992 */
1993 skb = dn_alloc_send_skb(sk, &len, flags & MSG_DONTWAIT, timeo, &err);
1994
1995 if (err)
1996 break;
1997
1998 if (!skb)
1999 continue;
2000
2001 cb = DN_SKB_CB(skb);
2002
2003 skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
2004
2005 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2006 err = -EFAULT;
2007 goto out;
2008 }
2009
2010 if (flags & MSG_OOB) {
2011 cb->nsp_flags = 0x30;
2012 if (fctype != NSP_FC_NONE)
2013 scp->flowrem_oth--;
2014 } else {
2015 cb->nsp_flags = 0x00;
2016 if (scp->seg_total == 0)
2017 cb->nsp_flags |= 0x20;
2018
2019 scp->seg_total += len;
2020
2021 if (((sent + len) == size) && (flags & MSG_EOR)) {
2022 cb->nsp_flags |= 0x40;
2023 scp->seg_total = 0;
2024 if (fctype == NSP_FC_SCMC)
2025 scp->flowrem_dat--;
2026 }
2027 if (fctype == NSP_FC_SRC)
2028 scp->flowrem_dat--;
2029 }
2030
2031 sent += len;
2032 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2033 skb = NULL;
2034
2035 scp->persist = dn_nsp_persist(sk);
2036
2037 }
2038out:
2039
2040 if (skb)
2041 kfree_skb(skb);
2042
2043 release_sock(sk);
2044
2045 return sent ? sent : err;
2046
2047out_err:
2048 err = dn_error(sk, flags, err);
2049 release_sock(sk);
2050 return err;
2051}
2052
2053static int dn_device_event(struct notifier_block *this, unsigned long event,
2054 void *ptr)
2055{
2056 struct net_device *dev = (struct net_device *)ptr;
2057
2058 switch(event) {
2059 case NETDEV_UP:
2060 dn_dev_up(dev);
2061 break;
2062 case NETDEV_DOWN:
2063 dn_dev_down(dev);
2064 break;
2065 default:
2066 break;
2067 }
2068
2069 return NOTIFY_DONE;
2070}
2071
2072static struct notifier_block dn_dev_notifier = {
2073 .notifier_call = dn_device_event,
2074};
2075
2076extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *);
2077
2078static struct packet_type dn_dix_packet_type = {
2079 .type = __constant_htons(ETH_P_DNA_RT),
2080 .dev = NULL, /* All devices */
2081 .func = dn_route_rcv,
2082};
2083
2084#ifdef CONFIG_PROC_FS
2085struct dn_iter_state {
2086 int bucket;
2087};
2088
2089static struct sock *dn_socket_get_first(struct seq_file *seq)
2090{
2091 struct dn_iter_state *state = seq->private;
2092 struct sock *n = NULL;
2093
2094 for(state->bucket = 0;
2095 state->bucket < DN_SK_HASH_SIZE;
2096 ++state->bucket) {
2097 n = sk_head(&dn_sk_hash[state->bucket]);
2098 if (n)
2099 break;
2100 }
2101
2102 return n;
2103}
2104
2105static struct sock *dn_socket_get_next(struct seq_file *seq,
2106 struct sock *n)
2107{
2108 struct dn_iter_state *state = seq->private;
2109
2110 n = sk_next(n);
2111try_again:
2112 if (n)
2113 goto out;
2114 if (++state->bucket >= DN_SK_HASH_SIZE)
2115 goto out;
2116 n = sk_head(&dn_sk_hash[state->bucket]);
2117 goto try_again;
2118out:
2119 return n;
2120}
2121
2122static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2123{
2124 struct sock *sk = dn_socket_get_first(seq);
2125
2126 if (sk) {
2127 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2128 --*pos;
2129 }
2130 return *pos ? NULL : sk;
2131}
2132
2133static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2134{
2135 void *rc;
2136 read_lock_bh(&dn_hash_lock);
2137 rc = socket_get_idx(seq, &pos);
2138 if (!rc) {
2139 read_unlock_bh(&dn_hash_lock);
2140 }
2141 return rc;
2142}
2143
2144static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2145{
2146 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2147}
2148
2149static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2150{
2151 void *rc;
2152
2153 if (v == SEQ_START_TOKEN) {
2154 rc = dn_socket_get_idx(seq, 0);
2155 goto out;
2156 }
2157
2158 rc = dn_socket_get_next(seq, v);
2159 if (rc)
2160 goto out;
2161 read_unlock_bh(&dn_hash_lock);
2162out:
2163 ++*pos;
2164 return rc;
2165}
2166
2167static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2168{
2169 if (v && v != SEQ_START_TOKEN)
2170 read_unlock_bh(&dn_hash_lock);
2171}
2172
2173#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2174
2175static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2176{
2177 int i;
2178
2179 switch (dn_ntohs(dn->sdn_objnamel)) {
2180 case 0:
2181 sprintf(buf, "%d", dn->sdn_objnum);
2182 break;
2183 default:
2184 for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2185 buf[i] = dn->sdn_objname[i];
2186 if (IS_NOT_PRINTABLE(buf[i]))
2187 buf[i] = '.';
2188 }
2189 buf[i] = 0;
2190 }
2191}
2192
2193static char *dn_state2asc(unsigned char state)
2194{
2195 switch(state) {
2196 case DN_O:
2197 return "OPEN";
2198 case DN_CR:
2199 return " CR";
2200 case DN_DR:
2201 return " DR";
2202 case DN_DRC:
2203 return " DRC";
2204 case DN_CC:
2205 return " CC";
2206 case DN_CI:
2207 return " CI";
2208 case DN_NR:
2209 return " NR";
2210 case DN_NC:
2211 return " NC";
2212 case DN_CD:
2213 return " CD";
2214 case DN_RJ:
2215 return " RJ";
2216 case DN_RUN:
2217 return " RUN";
2218 case DN_DI:
2219 return " DI";
2220 case DN_DIC:
2221 return " DIC";
2222 case DN_DN:
2223 return " DN";
2224 case DN_CL:
2225 return " CL";
2226 case DN_CN:
2227 return " CN";
2228 }
2229
2230 return "????";
2231}
2232
2233static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2234{
2235 struct dn_scp *scp = DN_SK(sk);
2236 char buf1[DN_ASCBUF_LEN];
2237 char buf2[DN_ASCBUF_LEN];
2238 char local_object[DN_MAXOBJL+3];
2239 char remote_object[DN_MAXOBJL+3];
2240
2241 dn_printable_object(&scp->addr, local_object);
2242 dn_printable_object(&scp->peer, remote_object);
2243
2244 seq_printf(seq,
2245 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2246 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2247 dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2248 scp->addrloc,
2249 scp->numdat,
2250 scp->numoth,
2251 scp->ackxmt_dat,
2252 scp->ackxmt_oth,
2253 scp->flowloc_sw,
2254 local_object,
2255 dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2256 scp->addrrem,
2257 scp->numdat_rcv,
2258 scp->numoth_rcv,
2259 scp->ackrcv_dat,
2260 scp->ackrcv_oth,
2261 scp->flowrem_sw,
2262 remote_object,
2263 dn_state2asc(scp->state),
2264 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2265}
2266
2267static int dn_socket_seq_show(struct seq_file *seq, void *v)
2268{
2269 if (v == SEQ_START_TOKEN) {
2270 seq_puts(seq, "Local Remote\n");
2271 } else {
2272 dn_socket_format_entry(seq, v);
2273 }
2274 return 0;
2275}
2276
2277static struct seq_operations dn_socket_seq_ops = {
2278 .start = dn_socket_seq_start,
2279 .next = dn_socket_seq_next,
2280 .stop = dn_socket_seq_stop,
2281 .show = dn_socket_seq_show,
2282};
2283
2284static int dn_socket_seq_open(struct inode *inode, struct file *file)
2285{
2286 struct seq_file *seq;
2287 int rc = -ENOMEM;
2288 struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2289
2290 if (!s)
2291 goto out;
2292
2293 rc = seq_open(file, &dn_socket_seq_ops);
2294 if (rc)
2295 goto out_kfree;
2296
2297 seq = file->private_data;
2298 seq->private = s;
2299 memset(s, 0, sizeof(*s));
2300out:
2301 return rc;
2302out_kfree:
2303 kfree(s);
2304 goto out;
2305}
2306
2307static struct file_operations dn_socket_seq_fops = {
2308 .owner = THIS_MODULE,
2309 .open = dn_socket_seq_open,
2310 .read = seq_read,
2311 .llseek = seq_lseek,
2312 .release = seq_release_private,
2313};
2314#endif
2315
2316static struct net_proto_family dn_family_ops = {
2317 .family = AF_DECnet,
2318 .create = dn_create,
2319 .owner = THIS_MODULE,
2320};
2321
2322static struct proto_ops dn_proto_ops = {
2323 .family = AF_DECnet,
2324 .owner = THIS_MODULE,
2325 .release = dn_release,
2326 .bind = dn_bind,
2327 .connect = dn_connect,
2328 .socketpair = sock_no_socketpair,
2329 .accept = dn_accept,
2330 .getname = dn_getname,
2331 .poll = dn_poll,
2332 .ioctl = dn_ioctl,
2333 .listen = dn_listen,
2334 .shutdown = dn_shutdown,
2335 .setsockopt = dn_setsockopt,
2336 .getsockopt = dn_getsockopt,
2337 .sendmsg = dn_sendmsg,
2338 .recvmsg = dn_recvmsg,
2339 .mmap = sock_no_mmap,
2340 .sendpage = sock_no_sendpage,
2341};
2342
2343void dn_register_sysctl(void);
2344void dn_unregister_sysctl(void);
2345
2346MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2347MODULE_AUTHOR("Linux DECnet Project Team");
2348MODULE_LICENSE("GPL");
2349MODULE_ALIAS_NETPROTO(PF_DECnet);
2350
2351static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2352
2353static int __init decnet_init(void)
2354{
2355 int rc;
2356
2357 printk(banner);
2358
2359 rc = proto_register(&dn_proto, 1);
2360 if (rc != 0)
2361 goto out;
2362
2363 dn_neigh_init();
2364 dn_dev_init();
2365 dn_route_init();
2366 dn_fib_init();
2367
2368 sock_register(&dn_family_ops);
2369 dev_add_pack(&dn_dix_packet_type);
2370 register_netdevice_notifier(&dn_dev_notifier);
2371
2372 proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
2373 dn_register_sysctl();
2374out:
2375 return rc;
2376
2377}
2378module_init(decnet_init);
2379
2380/*
2381 * Prevent DECnet module unloading until its fixed properly.
2382 * Requires an audit of the code to check for memory leaks and
2383 * initialisation problems etc.
2384 */
2385#if 0
2386static void __exit decnet_exit(void)
2387{
2388 sock_unregister(AF_DECnet);
2389 dev_remove_pack(&dn_dix_packet_type);
2390
2391 dn_unregister_sysctl();
2392
2393 unregister_netdevice_notifier(&dn_dev_notifier);
2394
2395 dn_route_cleanup();
2396 dn_dev_cleanup();
2397 dn_neigh_cleanup();
2398 dn_fib_cleanup();
2399
2400 proc_net_remove("decnet");
2401
2402 proto_unregister(&dn_proto);
2403}
2404module_exit(decnet_exit);
2405#endif
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
new file mode 100644
index 000000000000..c2a0346f423b
--- /dev/null
+++ b/net/decnet/dn_dev.c
@@ -0,0 +1,1481 @@
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Device Layer
7 *
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 * Steve Whitehouse : Devices now see incoming frames so they
13 * can mark on who it came from.
14 * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
15 * can now have a device specific setup func.
16 * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
17 * Steve Whitehouse : Fixed bug which sometimes killed timer
18 * Steve Whitehouse : Multiple ifaddr support
19 * Steve Whitehouse : SIOCGIFCONF is now a compile time option
20 * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
21 * Steve Whitehouse : Removed timer1 - it's a user space issue now
22 * Patrick Caulfield : Fixed router hello message format
23 * Steve Whitehouse : Got rid of constant sizes for blksize for
24 * devices. All mtu based now.
25 */
26
27#include <linux/config.h>
28#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/init.h>
31#include <linux/net.h>
32#include <linux/netdevice.h>
33#include <linux/proc_fs.h>
34#include <linux/seq_file.h>
35#include <linux/timer.h>
36#include <linux/string.h>
37#include <linux/if_arp.h>
38#include <linux/if_ether.h>
39#include <linux/skbuff.h>
40#include <linux/rtnetlink.h>
41#include <linux/sysctl.h>
42#include <linux/notifier.h>
43#include <asm/uaccess.h>
44#include <asm/system.h>
45#include <net/neighbour.h>
46#include <net/dst.h>
47#include <net/flow.h>
48#include <net/dn.h>
49#include <net/dn_dev.h>
50#include <net/dn_route.h>
51#include <net/dn_neigh.h>
52#include <net/dn_fib.h>
53
54#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
55
56static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
57static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
58static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
59static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
60
61extern struct neigh_table dn_neigh_table;
62
63/*
64 * decnet_address is kept in network order.
65 */
66dn_address decnet_address = 0;
67
68static DEFINE_RWLOCK(dndev_lock);
69static struct net_device *decnet_default_device;
70static struct notifier_block *dnaddr_chain;
71
72static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
73static void dn_dev_delete(struct net_device *dev);
74static void rtmsg_ifa(int event, struct dn_ifaddr *ifa);
75
76static int dn_eth_up(struct net_device *);
77static void dn_eth_down(struct net_device *);
78static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
79static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
80
81static struct dn_dev_parms dn_dev_list[] = {
82{
83 .type = ARPHRD_ETHER, /* Ethernet */
84 .mode = DN_DEV_BCAST,
85 .state = DN_DEV_S_RU,
86 .t2 = 1,
87 .t3 = 10,
88 .name = "ethernet",
89 .ctl_name = NET_DECNET_CONF_ETHER,
90 .up = dn_eth_up,
91 .down = dn_eth_down,
92 .timer3 = dn_send_brd_hello,
93},
94{
95 .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
96 .mode = DN_DEV_BCAST,
97 .state = DN_DEV_S_RU,
98 .t2 = 1,
99 .t3 = 10,
100 .name = "ipgre",
101 .ctl_name = NET_DECNET_CONF_GRE,
102 .timer3 = dn_send_brd_hello,
103},
104#if 0
105{
106 .type = ARPHRD_X25, /* Bog standard X.25 */
107 .mode = DN_DEV_UCAST,
108 .state = DN_DEV_S_DS,
109 .t2 = 1,
110 .t3 = 120,
111 .name = "x25",
112 .ctl_name = NET_DECNET_CONF_X25,
113 .timer3 = dn_send_ptp_hello,
114},
115#endif
116#if 0
117{
118 .type = ARPHRD_PPP, /* DECnet over PPP */
119 .mode = DN_DEV_BCAST,
120 .state = DN_DEV_S_RU,
121 .t2 = 1,
122 .t3 = 10,
123 .name = "ppp",
124 .ctl_name = NET_DECNET_CONF_PPP,
125 .timer3 = dn_send_brd_hello,
126},
127#endif
128{
129 .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
130 .mode = DN_DEV_UCAST,
131 .state = DN_DEV_S_DS,
132 .t2 = 1,
133 .t3 = 120,
134 .name = "ddcmp",
135 .ctl_name = NET_DECNET_CONF_DDCMP,
136 .timer3 = dn_send_ptp_hello,
137},
138{
139 .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
140 .mode = DN_DEV_BCAST,
141 .state = DN_DEV_S_RU,
142 .t2 = 1,
143 .t3 = 10,
144 .name = "loopback",
145 .ctl_name = NET_DECNET_CONF_LOOPBACK,
146 .timer3 = dn_send_brd_hello,
147}
148};
149
150#define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
151
152#define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
153
154#ifdef CONFIG_SYSCTL
155
156static int min_t2[] = { 1 };
157static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
158static int min_t3[] = { 1 };
159static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
160
161static int min_priority[1];
162static int max_priority[] = { 127 }; /* From DECnet spec */
163
164static int dn_forwarding_proc(ctl_table *, int, struct file *,
165 void __user *, size_t *, loff_t *);
166static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
167 void __user *oldval, size_t __user *oldlenp,
168 void __user *newval, size_t newlen,
169 void **context);
170
171static struct dn_dev_sysctl_table {
172 struct ctl_table_header *sysctl_header;
173 ctl_table dn_dev_vars[5];
174 ctl_table dn_dev_dev[2];
175 ctl_table dn_dev_conf_dir[2];
176 ctl_table dn_dev_proto_dir[2];
177 ctl_table dn_dev_root_dir[2];
178} dn_dev_sysctl = {
179 NULL,
180 {
181 {
182 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
183 .procname = "forwarding",
184 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
185 .maxlen = sizeof(int),
186 .mode = 0644,
187 .proc_handler = dn_forwarding_proc,
188 .strategy = dn_forwarding_sysctl,
189 },
190 {
191 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
192 .procname = "priority",
193 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
194 .maxlen = sizeof(int),
195 .mode = 0644,
196 .proc_handler = proc_dointvec_minmax,
197 .strategy = sysctl_intvec,
198 .extra1 = &min_priority,
199 .extra2 = &max_priority
200 },
201 {
202 .ctl_name = NET_DECNET_CONF_DEV_T2,
203 .procname = "t2",
204 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
205 .maxlen = sizeof(int),
206 .mode = 0644,
207 .proc_handler = proc_dointvec_minmax,
208 .strategy = sysctl_intvec,
209 .extra1 = &min_t2,
210 .extra2 = &max_t2
211 },
212 {
213 .ctl_name = NET_DECNET_CONF_DEV_T3,
214 .procname = "t3",
215 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
216 .maxlen = sizeof(int),
217 .mode = 0644,
218 .proc_handler = proc_dointvec_minmax,
219 .strategy = sysctl_intvec,
220 .extra1 = &min_t3,
221 .extra2 = &max_t3
222 },
223 {0}
224 },
225 {{
226 .ctl_name = 0,
227 .procname = "",
228 .mode = 0555,
229 .child = dn_dev_sysctl.dn_dev_vars
230 }, {0}},
231 {{
232 .ctl_name = NET_DECNET_CONF,
233 .procname = "conf",
234 .mode = 0555,
235 .child = dn_dev_sysctl.dn_dev_dev
236 }, {0}},
237 {{
238 .ctl_name = NET_DECNET,
239 .procname = "decnet",
240 .mode = 0555,
241 .child = dn_dev_sysctl.dn_dev_conf_dir
242 }, {0}},
243 {{
244 .ctl_name = CTL_NET,
245 .procname = "net",
246 .mode = 0555,
247 .child = dn_dev_sysctl.dn_dev_proto_dir
248 }, {0}}
249};
250
251static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
252{
253 struct dn_dev_sysctl_table *t;
254 int i;
255
256 t = kmalloc(sizeof(*t), GFP_KERNEL);
257 if (t == NULL)
258 return;
259
260 memcpy(t, &dn_dev_sysctl, sizeof(*t));
261
262 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
263 long offset = (long)t->dn_dev_vars[i].data;
264 t->dn_dev_vars[i].data = ((char *)parms) + offset;
265 t->dn_dev_vars[i].de = NULL;
266 }
267
268 if (dev) {
269 t->dn_dev_dev[0].procname = dev->name;
270 t->dn_dev_dev[0].ctl_name = dev->ifindex;
271 } else {
272 t->dn_dev_dev[0].procname = parms->name;
273 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
274 }
275
276 t->dn_dev_dev[0].child = t->dn_dev_vars;
277 t->dn_dev_dev[0].de = NULL;
278 t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
279 t->dn_dev_conf_dir[0].de = NULL;
280 t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
281 t->dn_dev_proto_dir[0].de = NULL;
282 t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
283 t->dn_dev_root_dir[0].de = NULL;
284 t->dn_dev_vars[0].extra1 = (void *)dev;
285
286 t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
287 if (t->sysctl_header == NULL)
288 kfree(t);
289 else
290 parms->sysctl = t;
291}
292
293static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
294{
295 if (parms->sysctl) {
296 struct dn_dev_sysctl_table *t = parms->sysctl;
297 parms->sysctl = NULL;
298 unregister_sysctl_table(t->sysctl_header);
299 kfree(t);
300 }
301}
302
303static int dn_forwarding_proc(ctl_table *table, int write,
304 struct file *filep,
305 void __user *buffer,
306 size_t *lenp, loff_t *ppos)
307{
308#ifdef CONFIG_DECNET_ROUTER
309 struct net_device *dev = table->extra1;
310 struct dn_dev *dn_db;
311 int err;
312 int tmp, old;
313
314 if (table->extra1 == NULL)
315 return -EINVAL;
316
317 dn_db = dev->dn_ptr;
318 old = dn_db->parms.forwarding;
319
320 err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
321
322 if ((err >= 0) && write) {
323 if (dn_db->parms.forwarding < 0)
324 dn_db->parms.forwarding = 0;
325 if (dn_db->parms.forwarding > 2)
326 dn_db->parms.forwarding = 2;
327 /*
328 * What an ugly hack this is... its works, just. It
329 * would be nice if sysctl/proc were just that little
330 * bit more flexible so I don't have to write a special
331 * routine, or suffer hacks like this - SJW
332 */
333 tmp = dn_db->parms.forwarding;
334 dn_db->parms.forwarding = old;
335 if (dn_db->parms.down)
336 dn_db->parms.down(dev);
337 dn_db->parms.forwarding = tmp;
338 if (dn_db->parms.up)
339 dn_db->parms.up(dev);
340 }
341
342 return err;
343#else
344 return -EINVAL;
345#endif
346}
347
348static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
349 void __user *oldval, size_t __user *oldlenp,
350 void __user *newval, size_t newlen,
351 void **context)
352{
353#ifdef CONFIG_DECNET_ROUTER
354 struct net_device *dev = table->extra1;
355 struct dn_dev *dn_db;
356 int value;
357
358 if (table->extra1 == NULL)
359 return -EINVAL;
360
361 dn_db = dev->dn_ptr;
362
363 if (newval && newlen) {
364 if (newlen != sizeof(int))
365 return -EINVAL;
366
367 if (get_user(value, (int __user *)newval))
368 return -EFAULT;
369 if (value < 0)
370 return -EINVAL;
371 if (value > 2)
372 return -EINVAL;
373
374 if (dn_db->parms.down)
375 dn_db->parms.down(dev);
376 dn_db->parms.forwarding = value;
377 if (dn_db->parms.up)
378 dn_db->parms.up(dev);
379 }
380
381 return 0;
382#else
383 return -EINVAL;
384#endif
385}
386
387#else /* CONFIG_SYSCTL */
388static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
389{
390}
391static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
392{
393}
394
395#endif /* CONFIG_SYSCTL */
396
397static inline __u16 mtu2blksize(struct net_device *dev)
398{
399 u32 blksize = dev->mtu;
400 if (blksize > 0xffff)
401 blksize = 0xffff;
402
403 if (dev->type == ARPHRD_ETHER ||
404 dev->type == ARPHRD_PPP ||
405 dev->type == ARPHRD_IPGRE ||
406 dev->type == ARPHRD_LOOPBACK)
407 blksize -= 2;
408
409 return (__u16)blksize;
410}
411
412static struct dn_ifaddr *dn_dev_alloc_ifa(void)
413{
414 struct dn_ifaddr *ifa;
415
416 ifa = kmalloc(sizeof(*ifa), GFP_KERNEL);
417
418 if (ifa) {
419 memset(ifa, 0, sizeof(*ifa));
420 }
421
422 return ifa;
423}
424
425static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
426{
427 kfree(ifa);
428}
429
430static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
431{
432 struct dn_ifaddr *ifa1 = *ifap;
433 unsigned char mac_addr[6];
434 struct net_device *dev = dn_db->dev;
435
436 ASSERT_RTNL();
437
438 *ifap = ifa1->ifa_next;
439
440 if (dn_db->dev->type == ARPHRD_ETHER) {
441 if (ifa1->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
442 dn_dn2eth(mac_addr, ifa1->ifa_local);
443 dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
444 }
445 }
446
447 rtmsg_ifa(RTM_DELADDR, ifa1);
448 notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
449 if (destroy) {
450 dn_dev_free_ifa(ifa1);
451
452 if (dn_db->ifa_list == NULL)
453 dn_dev_delete(dn_db->dev);
454 }
455}
456
457static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
458{
459 struct net_device *dev = dn_db->dev;
460 struct dn_ifaddr *ifa1;
461 unsigned char mac_addr[6];
462
463 ASSERT_RTNL();
464
465 /* Check for duplicates */
466 for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
467 if (ifa1->ifa_local == ifa->ifa_local)
468 return -EEXIST;
469 }
470
471 if (dev->type == ARPHRD_ETHER) {
472 if (ifa->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
473 dn_dn2eth(mac_addr, ifa->ifa_local);
474 dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
475 dev_mc_upload(dev);
476 }
477 }
478
479 ifa->ifa_next = dn_db->ifa_list;
480 dn_db->ifa_list = ifa;
481
482 rtmsg_ifa(RTM_NEWADDR, ifa);
483 notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
484
485 return 0;
486}
487
488static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
489{
490 struct dn_dev *dn_db = dev->dn_ptr;
491 int rv;
492
493 if (dn_db == NULL) {
494 int err;
495 dn_db = dn_dev_create(dev, &err);
496 if (dn_db == NULL)
497 return err;
498 }
499
500 ifa->ifa_dev = dn_db;
501
502 if (dev->flags & IFF_LOOPBACK)
503 ifa->ifa_scope = RT_SCOPE_HOST;
504
505 rv = dn_dev_insert_ifa(dn_db, ifa);
506 if (rv)
507 dn_dev_free_ifa(ifa);
508 return rv;
509}
510
511
512int dn_dev_ioctl(unsigned int cmd, void __user *arg)
513{
514 char buffer[DN_IFREQ_SIZE];
515 struct ifreq *ifr = (struct ifreq *)buffer;
516 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
517 struct dn_dev *dn_db;
518 struct net_device *dev;
519 struct dn_ifaddr *ifa = NULL, **ifap = NULL;
520 int ret = 0;
521
522 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
523 return -EFAULT;
524 ifr->ifr_name[IFNAMSIZ-1] = 0;
525
526#ifdef CONFIG_KMOD
527 dev_load(ifr->ifr_name);
528#endif
529
530 switch(cmd) {
531 case SIOCGIFADDR:
532 break;
533 case SIOCSIFADDR:
534 if (!capable(CAP_NET_ADMIN))
535 return -EACCES;
536 if (sdn->sdn_family != AF_DECnet)
537 return -EINVAL;
538 break;
539 default:
540 return -EINVAL;
541 }
542
543 rtnl_lock();
544
545 if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
546 ret = -ENODEV;
547 goto done;
548 }
549
550 if ((dn_db = dev->dn_ptr) != NULL) {
551 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
552 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
553 break;
554 }
555
556 if (ifa == NULL && cmd != SIOCSIFADDR) {
557 ret = -EADDRNOTAVAIL;
558 goto done;
559 }
560
561 switch(cmd) {
562 case SIOCGIFADDR:
563 *((dn_address *)sdn->sdn_nodeaddr) = ifa->ifa_local;
564 goto rarok;
565
566 case SIOCSIFADDR:
567 if (!ifa) {
568 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
569 ret = -ENOBUFS;
570 break;
571 }
572 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
573 } else {
574 if (ifa->ifa_local == dn_saddr2dn(sdn))
575 break;
576 dn_dev_del_ifa(dn_db, ifap, 0);
577 }
578
579 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
580
581 ret = dn_dev_set_ifa(dev, ifa);
582 }
583done:
584 rtnl_unlock();
585
586 return ret;
587rarok:
588 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
589 ret = -EFAULT;
590 goto done;
591}
592
593struct net_device *dn_dev_get_default(void)
594{
595 struct net_device *dev;
596 read_lock(&dndev_lock);
597 dev = decnet_default_device;
598 if (dev) {
599 if (dev->dn_ptr)
600 dev_hold(dev);
601 else
602 dev = NULL;
603 }
604 read_unlock(&dndev_lock);
605 return dev;
606}
607
608int dn_dev_set_default(struct net_device *dev, int force)
609{
610 struct net_device *old = NULL;
611 int rv = -EBUSY;
612 if (!dev->dn_ptr)
613 return -ENODEV;
614 write_lock(&dndev_lock);
615 if (force || decnet_default_device == NULL) {
616 old = decnet_default_device;
617 decnet_default_device = dev;
618 rv = 0;
619 }
620 write_unlock(&dndev_lock);
621 if (old)
622 dev_put(dev);
623 return rv;
624}
625
626static void dn_dev_check_default(struct net_device *dev)
627{
628 write_lock(&dndev_lock);
629 if (dev == decnet_default_device) {
630 decnet_default_device = NULL;
631 } else {
632 dev = NULL;
633 }
634 write_unlock(&dndev_lock);
635 if (dev)
636 dev_put(dev);
637}
638
639static struct dn_dev *dn_dev_by_index(int ifindex)
640{
641 struct net_device *dev;
642 struct dn_dev *dn_dev = NULL;
643 dev = dev_get_by_index(ifindex);
644 if (dev) {
645 dn_dev = dev->dn_ptr;
646 dev_put(dev);
647 }
648
649 return dn_dev;
650}
651
652static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
653{
654 struct rtattr **rta = arg;
655 struct dn_dev *dn_db;
656 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
657 struct dn_ifaddr *ifa, **ifap;
658
659 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
660 return -EADDRNOTAVAIL;
661
662 for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
663 void *tmp = rta[IFA_LOCAL-1];
664 if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
665 (rta[IFA_LABEL-1] && rtattr_strcmp(rta[IFA_LABEL-1], ifa->ifa_label)))
666 continue;
667
668 dn_dev_del_ifa(dn_db, ifap, 1);
669 return 0;
670 }
671
672 return -EADDRNOTAVAIL;
673}
674
675static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
676{
677 struct rtattr **rta = arg;
678 struct net_device *dev;
679 struct dn_dev *dn_db;
680 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
681 struct dn_ifaddr *ifa;
682 int rv;
683
684 if (rta[IFA_LOCAL-1] == NULL)
685 return -EINVAL;
686
687 if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
688 return -ENODEV;
689
690 if ((dn_db = dev->dn_ptr) == NULL) {
691 int err;
692 dn_db = dn_dev_create(dev, &err);
693 if (!dn_db)
694 return err;
695 }
696
697 if ((ifa = dn_dev_alloc_ifa()) == NULL)
698 return -ENOBUFS;
699
700 if (!rta[IFA_ADDRESS - 1])
701 rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
702 memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
703 memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
704 ifa->ifa_flags = ifm->ifa_flags;
705 ifa->ifa_scope = ifm->ifa_scope;
706 ifa->ifa_dev = dn_db;
707 if (rta[IFA_LABEL-1])
708 rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL-1], IFNAMSIZ);
709 else
710 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
711
712 rv = dn_dev_insert_ifa(dn_db, ifa);
713 if (rv)
714 dn_dev_free_ifa(ifa);
715 return rv;
716}
717
718static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
719 u32 pid, u32 seq, int event)
720{
721 struct ifaddrmsg *ifm;
722 struct nlmsghdr *nlh;
723 unsigned char *b = skb->tail;
724
725 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
726 ifm = NLMSG_DATA(nlh);
727
728 ifm->ifa_family = AF_DECnet;
729 ifm->ifa_prefixlen = 16;
730 ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
731 ifm->ifa_scope = ifa->ifa_scope;
732 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
733 if (ifa->ifa_address)
734 RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
735 if (ifa->ifa_local)
736 RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
737 if (ifa->ifa_label[0])
738 RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
739 nlh->nlmsg_len = skb->tail - b;
740 return skb->len;
741
742nlmsg_failure:
743rtattr_failure:
744 skb_trim(skb, b - skb->data);
745 return -1;
746}
747
748static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
749{
750 struct sk_buff *skb;
751 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
752
753 skb = alloc_skb(size, GFP_KERNEL);
754 if (!skb) {
755 netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, ENOBUFS);
756 return;
757 }
758 if (dn_dev_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
759 kfree_skb(skb);
760 netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, EINVAL);
761 return;
762 }
763 NETLINK_CB(skb).dst_groups = RTMGRP_DECnet_IFADDR;
764 netlink_broadcast(rtnl, skb, 0, RTMGRP_DECnet_IFADDR, GFP_KERNEL);
765}
766
767static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
768{
769 int idx, dn_idx;
770 int s_idx, s_dn_idx;
771 struct net_device *dev;
772 struct dn_dev *dn_db;
773 struct dn_ifaddr *ifa;
774
775 s_idx = cb->args[0];
776 s_dn_idx = dn_idx = cb->args[1];
777 read_lock(&dev_base_lock);
778 for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
779 if (idx < s_idx)
780 continue;
781 if (idx > s_idx)
782 s_dn_idx = 0;
783 if ((dn_db = dev->dn_ptr) == NULL)
784 continue;
785
786 for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
787 if (dn_idx < s_dn_idx)
788 continue;
789
790 if (dn_dev_fill_ifaddr(skb, ifa,
791 NETLINK_CB(cb->skb).pid,
792 cb->nlh->nlmsg_seq,
793 RTM_NEWADDR) <= 0)
794 goto done;
795 }
796 }
797done:
798 read_unlock(&dev_base_lock);
799 cb->args[0] = idx;
800 cb->args[1] = dn_idx;
801
802 return skb->len;
803}
804
805static int dn_dev_get_first(struct net_device *dev, dn_address *addr)
806{
807 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
808 struct dn_ifaddr *ifa;
809 int rv = -ENODEV;
810 if (dn_db == NULL)
811 goto out;
812 ifa = dn_db->ifa_list;
813 if (ifa != NULL) {
814 *addr = ifa->ifa_local;
815 rv = 0;
816 }
817out:
818 return rv;
819}
820
821/*
822 * Find a default address to bind to.
823 *
824 * This is one of those areas where the initial VMS concepts don't really
825 * map onto the Linux concepts, and since we introduced multiple addresses
826 * per interface we have to cope with slightly odd ways of finding out what
827 * "our address" really is. Mostly it's not a problem; for this we just guess
828 * a sensible default. Eventually the routing code will take care of all the
829 * nasties for us I hope.
830 */
831int dn_dev_bind_default(dn_address *addr)
832{
833 struct net_device *dev;
834 int rv;
835 dev = dn_dev_get_default();
836last_chance:
837 if (dev) {
838 read_lock(&dev_base_lock);
839 rv = dn_dev_get_first(dev, addr);
840 read_unlock(&dev_base_lock);
841 dev_put(dev);
842 if (rv == 0 || dev == &loopback_dev)
843 return rv;
844 }
845 dev = &loopback_dev;
846 dev_hold(dev);
847 goto last_chance;
848}
849
850static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
851{
852 struct endnode_hello_message *msg;
853 struct sk_buff *skb = NULL;
854 unsigned short int *pktlen;
855 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
856
857 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
858 return;
859
860 skb->dev = dev;
861
862 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
863
864 msg->msgflg = 0x0D;
865 memcpy(msg->tiver, dn_eco_version, 3);
866 dn_dn2eth(msg->id, ifa->ifa_local);
867 msg->iinfo = DN_RT_INFO_ENDN;
868 msg->blksize = dn_htons(mtu2blksize(dev));
869 msg->area = 0x00;
870 memset(msg->seed, 0, 8);
871 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
872
873 if (dn_db->router) {
874 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
875 dn_dn2eth(msg->neighbor, dn->addr);
876 }
877
878 msg->timer = dn_htons((unsigned short)dn_db->parms.t3);
879 msg->mpd = 0x00;
880 msg->datalen = 0x02;
881 memset(msg->data, 0xAA, 2);
882
883 pktlen = (unsigned short *)skb_push(skb,2);
884 *pktlen = dn_htons(skb->len - 2);
885
886 skb->nh.raw = skb->data;
887
888 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
889}
890
891
892#define DRDELAY (5 * HZ)
893
894static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
895{
896 /* First check time since device went up */
897 if ((jiffies - dn_db->uptime) < DRDELAY)
898 return 0;
899
900 /* If there is no router, then yes... */
901 if (!dn_db->router)
902 return 1;
903
904 /* otherwise only if we have a higher priority or.. */
905 if (dn->priority < dn_db->parms.priority)
906 return 1;
907
908 /* if we have equal priority and a higher node number */
909 if (dn->priority != dn_db->parms.priority)
910 return 0;
911
912 if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
913 return 1;
914
915 return 0;
916}
917
918static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
919{
920 int n;
921 struct dn_dev *dn_db = dev->dn_ptr;
922 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
923 struct sk_buff *skb;
924 size_t size;
925 unsigned char *ptr;
926 unsigned char *i1, *i2;
927 unsigned short *pktlen;
928 char *src;
929
930 if (mtu2blksize(dev) < (26 + 7))
931 return;
932
933 n = mtu2blksize(dev) - 26;
934 n /= 7;
935
936 if (n > 32)
937 n = 32;
938
939 size = 2 + 26 + 7 * n;
940
941 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
942 return;
943
944 skb->dev = dev;
945 ptr = skb_put(skb, size);
946
947 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
948 *ptr++ = 2; /* ECO */
949 *ptr++ = 0;
950 *ptr++ = 0;
951 dn_dn2eth(ptr, ifa->ifa_local);
952 src = ptr;
953 ptr += ETH_ALEN;
954 *ptr++ = dn_db->parms.forwarding == 1 ?
955 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
956 *((unsigned short *)ptr) = dn_htons(mtu2blksize(dev));
957 ptr += 2;
958 *ptr++ = dn_db->parms.priority; /* Priority */
959 *ptr++ = 0; /* Area: Reserved */
960 *((unsigned short *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
961 ptr += 2;
962 *ptr++ = 0; /* MPD: Reserved */
963 i1 = ptr++;
964 memset(ptr, 0, 7); /* Name: Reserved */
965 ptr += 7;
966 i2 = ptr++;
967
968 n = dn_neigh_elist(dev, ptr, n);
969
970 *i2 = 7 * n;
971 *i1 = 8 + *i2;
972
973 skb_trim(skb, (27 + *i2));
974
975 pktlen = (unsigned short *)skb_push(skb, 2);
976 *pktlen = dn_htons(skb->len - 2);
977
978 skb->nh.raw = skb->data;
979
980 if (dn_am_i_a_router(dn, dn_db, ifa)) {
981 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
982 if (skb2) {
983 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
984 }
985 }
986
987 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
988}
989
990static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
991{
992 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
993
994 if (dn_db->parms.forwarding == 0)
995 dn_send_endnode_hello(dev, ifa);
996 else
997 dn_send_router_hello(dev, ifa);
998}
999
1000static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1001{
1002 int tdlen = 16;
1003 int size = dev->hard_header_len + 2 + 4 + tdlen;
1004 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1005 int i;
1006 unsigned char *ptr;
1007 char src[ETH_ALEN];
1008
1009 if (skb == NULL)
1010 return ;
1011
1012 skb->dev = dev;
1013 skb_push(skb, dev->hard_header_len);
1014 ptr = skb_put(skb, 2 + 4 + tdlen);
1015
1016 *ptr++ = DN_RT_PKT_HELO;
1017 *((dn_address *)ptr) = ifa->ifa_local;
1018 ptr += 2;
1019 *ptr++ = tdlen;
1020
1021 for(i = 0; i < tdlen; i++)
1022 *ptr++ = 0252;
1023
1024 dn_dn2eth(src, ifa->ifa_local);
1025 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1026}
1027
1028static int dn_eth_up(struct net_device *dev)
1029{
1030 struct dn_dev *dn_db = dev->dn_ptr;
1031
1032 if (dn_db->parms.forwarding == 0)
1033 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1034 else
1035 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1036
1037 dev_mc_upload(dev);
1038
1039 dn_db->use_long = 1;
1040
1041 return 0;
1042}
1043
1044static void dn_eth_down(struct net_device *dev)
1045{
1046 struct dn_dev *dn_db = dev->dn_ptr;
1047
1048 if (dn_db->parms.forwarding == 0)
1049 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1050 else
1051 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1052}
1053
1054static void dn_dev_set_timer(struct net_device *dev);
1055
1056static void dn_dev_timer_func(unsigned long arg)
1057{
1058 struct net_device *dev = (struct net_device *)arg;
1059 struct dn_dev *dn_db = dev->dn_ptr;
1060 struct dn_ifaddr *ifa;
1061
1062 if (dn_db->t3 <= dn_db->parms.t2) {
1063 if (dn_db->parms.timer3) {
1064 for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1065 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1066 dn_db->parms.timer3(dev, ifa);
1067 }
1068 }
1069 dn_db->t3 = dn_db->parms.t3;
1070 } else {
1071 dn_db->t3 -= dn_db->parms.t2;
1072 }
1073
1074 dn_dev_set_timer(dev);
1075}
1076
1077static void dn_dev_set_timer(struct net_device *dev)
1078{
1079 struct dn_dev *dn_db = dev->dn_ptr;
1080
1081 if (dn_db->parms.t2 > dn_db->parms.t3)
1082 dn_db->parms.t2 = dn_db->parms.t3;
1083
1084 dn_db->timer.data = (unsigned long)dev;
1085 dn_db->timer.function = dn_dev_timer_func;
1086 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1087
1088 add_timer(&dn_db->timer);
1089}
1090
1091struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1092{
1093 int i;
1094 struct dn_dev_parms *p = dn_dev_list;
1095 struct dn_dev *dn_db;
1096
1097 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1098 if (p->type == dev->type)
1099 break;
1100 }
1101
1102 *err = -ENODEV;
1103 if (i == DN_DEV_LIST_SIZE)
1104 return NULL;
1105
1106 *err = -ENOBUFS;
1107 if ((dn_db = kmalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1108 return NULL;
1109
1110 memset(dn_db, 0, sizeof(struct dn_dev));
1111 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1112 smp_wmb();
1113 dev->dn_ptr = dn_db;
1114 dn_db->dev = dev;
1115 init_timer(&dn_db->timer);
1116
1117 dn_db->uptime = jiffies;
1118 if (dn_db->parms.up) {
1119 if (dn_db->parms.up(dev) < 0) {
1120 dev->dn_ptr = NULL;
1121 kfree(dn_db);
1122 return NULL;
1123 }
1124 }
1125
1126 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1127
1128 dn_dev_sysctl_register(dev, &dn_db->parms);
1129
1130 dn_dev_set_timer(dev);
1131
1132 *err = 0;
1133 return dn_db;
1134}
1135
1136
1137/*
1138 * This processes a device up event. We only start up
1139 * the loopback device & ethernet devices with correct
1140 * MAC addreses automatically. Others must be started
1141 * specifically.
1142 *
1143 * FIXME: How should we configure the loopback address ? If we could dispense
1144 * with using decnet_address here and for autobind, it will be one less thing
1145 * for users to worry about setting up.
1146 */
1147
1148void dn_dev_up(struct net_device *dev)
1149{
1150 struct dn_ifaddr *ifa;
1151 dn_address addr = decnet_address;
1152 int maybe_default = 0;
1153 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1154
1155 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1156 return;
1157
1158 /*
1159 * Need to ensure that loopback device has a dn_db attached to it
1160 * to allow creation of neighbours against it, even though it might
1161 * not have a local address of its own. Might as well do the same for
1162 * all autoconfigured interfaces.
1163 */
1164 if (dn_db == NULL) {
1165 int err;
1166 dn_db = dn_dev_create(dev, &err);
1167 if (dn_db == NULL)
1168 return;
1169 }
1170
1171 if (dev->type == ARPHRD_ETHER) {
1172 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1173 return;
1174 addr = dn_htons(dn_eth2dn(dev->dev_addr));
1175 maybe_default = 1;
1176 }
1177
1178 if (addr == 0)
1179 return;
1180
1181 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1182 return;
1183
1184 ifa->ifa_local = ifa->ifa_address = addr;
1185 ifa->ifa_flags = 0;
1186 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1187 strcpy(ifa->ifa_label, dev->name);
1188
1189 dn_dev_set_ifa(dev, ifa);
1190
1191 /*
1192 * Automagically set the default device to the first automatically
1193 * configured ethernet card in the system.
1194 */
1195 if (maybe_default) {
1196 dev_hold(dev);
1197 if (dn_dev_set_default(dev, 0))
1198 dev_put(dev);
1199 }
1200}
1201
1202static void dn_dev_delete(struct net_device *dev)
1203{
1204 struct dn_dev *dn_db = dev->dn_ptr;
1205
1206 if (dn_db == NULL)
1207 return;
1208
1209 del_timer_sync(&dn_db->timer);
1210 dn_dev_sysctl_unregister(&dn_db->parms);
1211 dn_dev_check_default(dev);
1212 neigh_ifdown(&dn_neigh_table, dev);
1213
1214 if (dn_db->parms.down)
1215 dn_db->parms.down(dev);
1216
1217 dev->dn_ptr = NULL;
1218
1219 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1220 neigh_ifdown(&dn_neigh_table, dev);
1221
1222 if (dn_db->router)
1223 neigh_release(dn_db->router);
1224 if (dn_db->peer)
1225 neigh_release(dn_db->peer);
1226
1227 kfree(dn_db);
1228}
1229
1230void dn_dev_down(struct net_device *dev)
1231{
1232 struct dn_dev *dn_db = dev->dn_ptr;
1233 struct dn_ifaddr *ifa;
1234
1235 if (dn_db == NULL)
1236 return;
1237
1238 while((ifa = dn_db->ifa_list) != NULL) {
1239 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1240 dn_dev_free_ifa(ifa);
1241 }
1242
1243 dn_dev_delete(dev);
1244}
1245
1246void dn_dev_init_pkt(struct sk_buff *skb)
1247{
1248 return;
1249}
1250
1251void dn_dev_veri_pkt(struct sk_buff *skb)
1252{
1253 return;
1254}
1255
1256void dn_dev_hello(struct sk_buff *skb)
1257{
1258 return;
1259}
1260
1261void dn_dev_devices_off(void)
1262{
1263 struct net_device *dev;
1264
1265 rtnl_lock();
1266 for(dev = dev_base; dev; dev = dev->next)
1267 dn_dev_down(dev);
1268 rtnl_unlock();
1269
1270}
1271
1272void dn_dev_devices_on(void)
1273{
1274 struct net_device *dev;
1275
1276 rtnl_lock();
1277 for(dev = dev_base; dev; dev = dev->next) {
1278 if (dev->flags & IFF_UP)
1279 dn_dev_up(dev);
1280 }
1281 rtnl_unlock();
1282}
1283
1284int register_dnaddr_notifier(struct notifier_block *nb)
1285{
1286 return notifier_chain_register(&dnaddr_chain, nb);
1287}
1288
1289int unregister_dnaddr_notifier(struct notifier_block *nb)
1290{
1291 return notifier_chain_unregister(&dnaddr_chain, nb);
1292}
1293
1294#ifdef CONFIG_PROC_FS
1295static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1296{
1297 do {
1298 dev = dev->next;
1299 } while(dev && !dev->dn_ptr);
1300
1301 return dev;
1302}
1303
1304static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1305{
1306 struct net_device *dev;
1307
1308 dev = dev_base;
1309 if (dev && !dev->dn_ptr)
1310 dev = dn_dev_get_next(seq, dev);
1311 if (pos) {
1312 while(dev && (dev = dn_dev_get_next(seq, dev)))
1313 --pos;
1314 }
1315 return dev;
1316}
1317
1318static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1319{
1320 if (*pos) {
1321 struct net_device *dev;
1322 read_lock(&dev_base_lock);
1323 dev = dn_dev_get_idx(seq, *pos - 1);
1324 if (dev == NULL)
1325 read_unlock(&dev_base_lock);
1326 return dev;
1327 }
1328 return SEQ_START_TOKEN;
1329}
1330
1331static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1332{
1333 struct net_device *dev = v;
1334 loff_t one = 1;
1335
1336 if (v == SEQ_START_TOKEN) {
1337 dev = dn_dev_seq_start(seq, &one);
1338 } else {
1339 dev = dn_dev_get_next(seq, dev);
1340 if (dev == NULL)
1341 read_unlock(&dev_base_lock);
1342 }
1343 ++*pos;
1344 return dev;
1345}
1346
1347static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1348{
1349 if (v && v != SEQ_START_TOKEN)
1350 read_unlock(&dev_base_lock);
1351}
1352
1353static char *dn_type2asc(char type)
1354{
1355 switch(type) {
1356 case DN_DEV_BCAST:
1357 return "B";
1358 case DN_DEV_UCAST:
1359 return "U";
1360 case DN_DEV_MPOINT:
1361 return "M";
1362 }
1363
1364 return "?";
1365}
1366
1367static int dn_dev_seq_show(struct seq_file *seq, void *v)
1368{
1369 if (v == SEQ_START_TOKEN)
1370 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1371 else {
1372 struct net_device *dev = v;
1373 char peer_buf[DN_ASCBUF_LEN];
1374 char router_buf[DN_ASCBUF_LEN];
1375 struct dn_dev *dn_db = dev->dn_ptr;
1376
1377 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1378 " %04hu %03d %02x %-10s %-7s %-7s\n",
1379 dev->name ? dev->name : "???",
1380 dn_type2asc(dn_db->parms.mode),
1381 0, 0,
1382 dn_db->t3, dn_db->parms.t3,
1383 mtu2blksize(dev),
1384 dn_db->parms.priority,
1385 dn_db->parms.state, dn_db->parms.name,
1386 dn_db->router ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->router->primary_key), router_buf) : "",
1387 dn_db->peer ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->peer->primary_key), peer_buf) : "");
1388 }
1389 return 0;
1390}
1391
1392static struct seq_operations dn_dev_seq_ops = {
1393 .start = dn_dev_seq_start,
1394 .next = dn_dev_seq_next,
1395 .stop = dn_dev_seq_stop,
1396 .show = dn_dev_seq_show,
1397};
1398
1399static int dn_dev_seq_open(struct inode *inode, struct file *file)
1400{
1401 return seq_open(file, &dn_dev_seq_ops);
1402}
1403
1404static struct file_operations dn_dev_seq_fops = {
1405 .owner = THIS_MODULE,
1406 .open = dn_dev_seq_open,
1407 .read = seq_read,
1408 .llseek = seq_lseek,
1409 .release = seq_release,
1410};
1411
1412#endif /* CONFIG_PROC_FS */
1413
1414static struct rtnetlink_link dnet_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
1415{
1416 [4] = { .doit = dn_dev_rtm_newaddr, },
1417 [5] = { .doit = dn_dev_rtm_deladdr, },
1418 [6] = { .dumpit = dn_dev_dump_ifaddr, },
1419
1420#ifdef CONFIG_DECNET_ROUTER
1421 [8] = { .doit = dn_fib_rtm_newroute, },
1422 [9] = { .doit = dn_fib_rtm_delroute, },
1423 [10] = { .doit = dn_cache_getroute, .dumpit = dn_fib_dump, },
1424 [16] = { .doit = dn_fib_rtm_newrule, },
1425 [17] = { .doit = dn_fib_rtm_delrule, },
1426 [18] = { .dumpit = dn_fib_dump_rules, },
1427#else
1428 [10] = { .doit = dn_cache_getroute, .dumpit = dn_cache_dump, },
1429#endif
1430
1431};
1432
1433static int __initdata addr[2];
1434module_param_array(addr, int, NULL, 0444);
1435MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1436
1437void __init dn_dev_init(void)
1438{
1439 if (addr[0] > 63 || addr[0] < 0) {
1440 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1441 return;
1442 }
1443
1444 if (addr[1] > 1023 || addr[1] < 0) {
1445 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1446 return;
1447 }
1448
1449 decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1450
1451 dn_dev_devices_on();
1452
1453 rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1454
1455 proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1456
1457#ifdef CONFIG_SYSCTL
1458 {
1459 int i;
1460 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1461 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1462 }
1463#endif /* CONFIG_SYSCTL */
1464}
1465
1466void __exit dn_dev_cleanup(void)
1467{
1468 rtnetlink_links[PF_DECnet] = NULL;
1469
1470#ifdef CONFIG_SYSCTL
1471 {
1472 int i;
1473 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1474 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1475 }
1476#endif /* CONFIG_SYSCTL */
1477
1478 proc_net_remove("decnet_dev");
1479
1480 dn_dev_devices_off();
1481}
diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c
new file mode 100644
index 000000000000..9934b25720e4
--- /dev/null
+++ b/net/decnet/dn_fib.c
@@ -0,0 +1,802 @@
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Routing Forwarding Information Base (Glue/Info List)
7 *
8 * Author: Steve Whitehouse <SteveW@ACM.org>
9 *
10 *
11 * Changes:
12 * Alexey Kuznetsov : SMP locking changes
13 * Steve Whitehouse : Rewrote it... Well to be more correct, I
14 * copied most of it from the ipv4 fib code.
15 * Steve Whitehouse : Updated it in style and fixed a few bugs
16 * which were fixed in the ipv4 code since
17 * this code was copied from it.
18 *
19 */
20#include <linux/config.h>
21#include <linux/string.h>
22#include <linux/net.h>
23#include <linux/socket.h>
24#include <linux/sockios.h>
25#include <linux/init.h>
26#include <linux/skbuff.h>
27#include <linux/netlink.h>
28#include <linux/rtnetlink.h>
29#include <linux/proc_fs.h>
30#include <linux/netdevice.h>
31#include <linux/timer.h>
32#include <linux/spinlock.h>
33#include <asm/atomic.h>
34#include <asm/uaccess.h>
35#include <net/neighbour.h>
36#include <net/dst.h>
37#include <net/flow.h>
38#include <net/dn.h>
39#include <net/dn_route.h>
40#include <net/dn_fib.h>
41#include <net/dn_neigh.h>
42#include <net/dn_dev.h>
43
44#define RT_MIN_TABLE 1
45
46#define for_fib_info() { struct dn_fib_info *fi;\
47 for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
48#define endfor_fib_info() }
49
50#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
51 for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
52
53#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
54 for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
55
56#define endfor_nexthops(fi) }
57
58extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
59
60static DEFINE_SPINLOCK(dn_fib_multipath_lock);
61static struct dn_fib_info *dn_fib_info_list;
62static DEFINE_RWLOCK(dn_fib_info_lock);
63
64static struct
65{
66 int error;
67 u8 scope;
68} dn_fib_props[RTA_MAX+1] = {
69 [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
70 [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
71 [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
72 [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
73 [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
74 [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
75 [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
76 [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
77 [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
78 [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
79 [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
80 [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
81};
82
83void dn_fib_free_info(struct dn_fib_info *fi)
84{
85 if (fi->fib_dead == 0) {
86 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
87 return;
88 }
89
90 change_nexthops(fi) {
91 if (nh->nh_dev)
92 dev_put(nh->nh_dev);
93 nh->nh_dev = NULL;
94 } endfor_nexthops(fi);
95 kfree(fi);
96}
97
98void dn_fib_release_info(struct dn_fib_info *fi)
99{
100 write_lock(&dn_fib_info_lock);
101 if (fi && --fi->fib_treeref == 0) {
102 if (fi->fib_next)
103 fi->fib_next->fib_prev = fi->fib_prev;
104 if (fi->fib_prev)
105 fi->fib_prev->fib_next = fi->fib_next;
106 if (fi == dn_fib_info_list)
107 dn_fib_info_list = fi->fib_next;
108 fi->fib_dead = 1;
109 dn_fib_info_put(fi);
110 }
111 write_unlock(&dn_fib_info_lock);
112}
113
114static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
115{
116 const struct dn_fib_nh *onh = ofi->fib_nh;
117
118 for_nexthops(fi) {
119 if (nh->nh_oif != onh->nh_oif ||
120 nh->nh_gw != onh->nh_gw ||
121 nh->nh_scope != onh->nh_scope ||
122 nh->nh_weight != onh->nh_weight ||
123 ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
124 return -1;
125 onh++;
126 } endfor_nexthops(fi);
127 return 0;
128}
129
130static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
131{
132 for_fib_info() {
133 if (fi->fib_nhs != nfi->fib_nhs)
134 continue;
135 if (nfi->fib_protocol == fi->fib_protocol &&
136 nfi->fib_prefsrc == fi->fib_prefsrc &&
137 nfi->fib_priority == fi->fib_priority &&
138 memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
139 ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
140 (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
141 return fi;
142 } endfor_fib_info();
143 return NULL;
144}
145
146u16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
147{
148 while(RTA_OK(attr,attrlen)) {
149 if (attr->rta_type == type)
150 return *(u16*)RTA_DATA(attr);
151 attr = RTA_NEXT(attr, attrlen);
152 }
153
154 return 0;
155}
156
157static int dn_fib_count_nhs(struct rtattr *rta)
158{
159 int nhs = 0;
160 struct rtnexthop *nhp = RTA_DATA(rta);
161 int nhlen = RTA_PAYLOAD(rta);
162
163 while(nhlen >= (int)sizeof(struct rtnexthop)) {
164 if ((nhlen -= nhp->rtnh_len) < 0)
165 return 0;
166 nhs++;
167 nhp = RTNH_NEXT(nhp);
168 }
169
170 return nhs;
171}
172
173static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
174{
175 struct rtnexthop *nhp = RTA_DATA(rta);
176 int nhlen = RTA_PAYLOAD(rta);
177
178 change_nexthops(fi) {
179 int attrlen = nhlen - sizeof(struct rtnexthop);
180 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
181 return -EINVAL;
182
183 nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
184 nh->nh_oif = nhp->rtnh_ifindex;
185 nh->nh_weight = nhp->rtnh_hops + 1;
186
187 if (attrlen) {
188 nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
189 }
190 nhp = RTNH_NEXT(nhp);
191 } endfor_nexthops(fi);
192
193 return 0;
194}
195
196
197static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
198{
199 int err;
200
201 if (nh->nh_gw) {
202 struct flowi fl;
203 struct dn_fib_res res;
204
205 memset(&fl, 0, sizeof(fl));
206
207 if (nh->nh_flags&RTNH_F_ONLINK) {
208 struct net_device *dev;
209
210 if (r->rtm_scope >= RT_SCOPE_LINK)
211 return -EINVAL;
212 if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
213 return -EINVAL;
214 if ((dev = __dev_get_by_index(nh->nh_oif)) == NULL)
215 return -ENODEV;
216 if (!(dev->flags&IFF_UP))
217 return -ENETDOWN;
218 nh->nh_dev = dev;
219 dev_hold(dev);
220 nh->nh_scope = RT_SCOPE_LINK;
221 return 0;
222 }
223
224 memset(&fl, 0, sizeof(fl));
225 fl.fld_dst = nh->nh_gw;
226 fl.oif = nh->nh_oif;
227 fl.fld_scope = r->rtm_scope + 1;
228
229 if (fl.fld_scope < RT_SCOPE_LINK)
230 fl.fld_scope = RT_SCOPE_LINK;
231
232 if ((err = dn_fib_lookup(&fl, &res)) != 0)
233 return err;
234
235 err = -EINVAL;
236 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
237 goto out;
238 nh->nh_scope = res.scope;
239 nh->nh_oif = DN_FIB_RES_OIF(res);
240 nh->nh_dev = DN_FIB_RES_DEV(res);
241 if (nh->nh_dev == NULL)
242 goto out;
243 dev_hold(nh->nh_dev);
244 err = -ENETDOWN;
245 if (!(nh->nh_dev->flags & IFF_UP))
246 goto out;
247 err = 0;
248out:
249 dn_fib_res_put(&res);
250 return err;
251 } else {
252 struct net_device *dev;
253
254 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
255 return -EINVAL;
256
257 dev = __dev_get_by_index(nh->nh_oif);
258 if (dev == NULL || dev->dn_ptr == NULL)
259 return -ENODEV;
260 if (!(dev->flags&IFF_UP))
261 return -ENETDOWN;
262 nh->nh_dev = dev;
263 dev_hold(nh->nh_dev);
264 nh->nh_scope = RT_SCOPE_HOST;
265 }
266
267 return 0;
268}
269
270
271struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
272{
273 int err;
274 struct dn_fib_info *fi = NULL;
275 struct dn_fib_info *ofi;
276 int nhs = 1;
277
278 if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
279 goto err_inval;
280
281 if (rta->rta_mp) {
282 nhs = dn_fib_count_nhs(rta->rta_mp);
283 if (nhs == 0)
284 goto err_inval;
285 }
286
287 fi = kmalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
288 err = -ENOBUFS;
289 if (fi == NULL)
290 goto failure;
291 memset(fi, 0, sizeof(*fi)+nhs*sizeof(struct dn_fib_nh));
292
293 fi->fib_protocol = r->rtm_protocol;
294 fi->fib_nhs = nhs;
295 fi->fib_flags = r->rtm_flags;
296 if (rta->rta_priority)
297 fi->fib_priority = *rta->rta_priority;
298 if (rta->rta_mx) {
299 int attrlen = RTA_PAYLOAD(rta->rta_mx);
300 struct rtattr *attr = RTA_DATA(rta->rta_mx);
301
302 while(RTA_OK(attr, attrlen)) {
303 unsigned flavour = attr->rta_type;
304 if (flavour) {
305 if (flavour > RTAX_MAX)
306 goto err_inval;
307 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
308 }
309 attr = RTA_NEXT(attr, attrlen);
310 }
311 }
312 if (rta->rta_prefsrc)
313 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
314
315 if (rta->rta_mp) {
316 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
317 goto failure;
318 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
319 goto err_inval;
320 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
321 goto err_inval;
322 } else {
323 struct dn_fib_nh *nh = fi->fib_nh;
324 if (rta->rta_oif)
325 nh->nh_oif = *rta->rta_oif;
326 if (rta->rta_gw)
327 memcpy(&nh->nh_gw, rta->rta_gw, 2);
328 nh->nh_flags = r->rtm_flags;
329 nh->nh_weight = 1;
330 }
331
332 if (r->rtm_type == RTN_NAT) {
333 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
334 goto err_inval;
335 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
336 goto link_it;
337 }
338
339 if (dn_fib_props[r->rtm_type].error) {
340 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
341 goto err_inval;
342 goto link_it;
343 }
344
345 if (r->rtm_scope > RT_SCOPE_HOST)
346 goto err_inval;
347
348 if (r->rtm_scope == RT_SCOPE_HOST) {
349 struct dn_fib_nh *nh = fi->fib_nh;
350
351 /* Local address is added */
352 if (nhs != 1 || nh->nh_gw)
353 goto err_inval;
354 nh->nh_scope = RT_SCOPE_NOWHERE;
355 nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif);
356 err = -ENODEV;
357 if (nh->nh_dev == NULL)
358 goto failure;
359 } else {
360 change_nexthops(fi) {
361 if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
362 goto failure;
363 } endfor_nexthops(fi)
364 }
365
366 if (fi->fib_prefsrc) {
367 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
368 memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
369 if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
370 goto err_inval;
371 }
372
373link_it:
374 if ((ofi = dn_fib_find_info(fi)) != NULL) {
375 fi->fib_dead = 1;
376 dn_fib_free_info(fi);
377 ofi->fib_treeref++;
378 return ofi;
379 }
380
381 fi->fib_treeref++;
382 atomic_inc(&fi->fib_clntref);
383 write_lock(&dn_fib_info_lock);
384 fi->fib_next = dn_fib_info_list;
385 fi->fib_prev = NULL;
386 if (dn_fib_info_list)
387 dn_fib_info_list->fib_prev = fi;
388 dn_fib_info_list = fi;
389 write_unlock(&dn_fib_info_lock);
390 return fi;
391
392err_inval:
393 err = -EINVAL;
394
395failure:
396 *errp = err;
397 if (fi) {
398 fi->fib_dead = 1;
399 dn_fib_free_info(fi);
400 }
401
402 return NULL;
403}
404
405int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
406{
407 int err = dn_fib_props[type].error;
408
409 if (err == 0) {
410 if (fi->fib_flags & RTNH_F_DEAD)
411 return 1;
412
413 res->fi = fi;
414
415 switch(type) {
416 case RTN_NAT:
417 DN_FIB_RES_RESET(*res);
418 atomic_inc(&fi->fib_clntref);
419 return 0;
420 case RTN_UNICAST:
421 case RTN_LOCAL:
422 for_nexthops(fi) {
423 if (nh->nh_flags & RTNH_F_DEAD)
424 continue;
425 if (!fl->oif || fl->oif == nh->nh_oif)
426 break;
427 }
428 if (nhsel < fi->fib_nhs) {
429 res->nh_sel = nhsel;
430 atomic_inc(&fi->fib_clntref);
431 return 0;
432 }
433 endfor_nexthops(fi);
434 res->fi = NULL;
435 return 1;
436 default:
437 if (net_ratelimit())
438 printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
439 res->fi = NULL;
440 return -EINVAL;
441 }
442 }
443 return err;
444}
445
446void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
447{
448 struct dn_fib_info *fi = res->fi;
449 int w;
450
451 spin_lock_bh(&dn_fib_multipath_lock);
452 if (fi->fib_power <= 0) {
453 int power = 0;
454 change_nexthops(fi) {
455 if (!(nh->nh_flags&RTNH_F_DEAD)) {
456 power += nh->nh_weight;
457 nh->nh_power = nh->nh_weight;
458 }
459 } endfor_nexthops(fi);
460 fi->fib_power = power;
461 if (power < 0) {
462 spin_unlock_bh(&dn_fib_multipath_lock);
463 res->nh_sel = 0;
464 return;
465 }
466 }
467
468 w = jiffies % fi->fib_power;
469
470 change_nexthops(fi) {
471 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
472 if ((w -= nh->nh_power) <= 0) {
473 nh->nh_power--;
474 fi->fib_power--;
475 res->nh_sel = nhsel;
476 spin_unlock_bh(&dn_fib_multipath_lock);
477 return;
478 }
479 }
480 } endfor_nexthops(fi);
481 res->nh_sel = 0;
482 spin_unlock_bh(&dn_fib_multipath_lock);
483}
484
485
486static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
487{
488 int i;
489
490 for(i = 1; i <= RTA_MAX; i++) {
491 struct rtattr *attr = rta[i-1];
492 if (attr) {
493 if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
494 return -EINVAL;
495 if (i != RTA_MULTIPATH && i != RTA_METRICS)
496 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
497 }
498 }
499
500 return 0;
501}
502
503int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
504{
505 struct dn_fib_table *tb;
506 struct rtattr **rta = arg;
507 struct rtmsg *r = NLMSG_DATA(nlh);
508
509 if (dn_fib_check_attr(r, rta))
510 return -EINVAL;
511
512 tb = dn_fib_get_table(r->rtm_table, 0);
513 if (tb)
514 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
515
516 return -ESRCH;
517}
518
519int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
520{
521 struct dn_fib_table *tb;
522 struct rtattr **rta = arg;
523 struct rtmsg *r = NLMSG_DATA(nlh);
524
525 if (dn_fib_check_attr(r, rta))
526 return -EINVAL;
527
528 tb = dn_fib_get_table(r->rtm_table, 1);
529 if (tb)
530 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
531
532 return -ENOBUFS;
533}
534
535
536int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb)
537{
538 int t;
539 int s_t;
540 struct dn_fib_table *tb;
541
542 if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
543 ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)
544 return dn_cache_dump(skb, cb);
545
546 s_t = cb->args[0];
547 if (s_t == 0)
548 s_t = cb->args[0] = RT_MIN_TABLE;
549
550 for(t = s_t; t <= RT_TABLE_MAX; t++) {
551 if (t < s_t)
552 continue;
553 if (t > s_t)
554 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(int));
555 tb = dn_fib_get_table(t, 0);
556 if (tb == NULL)
557 continue;
558 if (tb->dump(tb, skb, cb) < 0)
559 break;
560 }
561
562 cb->args[0] = t;
563
564 return skb->len;
565}
566
567static void fib_magic(int cmd, int type, __u16 dst, int dst_len, struct dn_ifaddr *ifa)
568{
569 struct dn_fib_table *tb;
570 struct {
571 struct nlmsghdr nlh;
572 struct rtmsg rtm;
573 } req;
574 struct dn_kern_rta rta;
575
576 memset(&req.rtm, 0, sizeof(req.rtm));
577 memset(&rta, 0, sizeof(rta));
578
579 if (type == RTN_UNICAST)
580 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
581 else
582 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
583
584 if (tb == NULL)
585 return;
586
587 req.nlh.nlmsg_len = sizeof(req);
588 req.nlh.nlmsg_type = cmd;
589 req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
590 req.nlh.nlmsg_pid = 0;
591 req.nlh.nlmsg_seq = 0;
592
593 req.rtm.rtm_dst_len = dst_len;
594 req.rtm.rtm_table = tb->n;
595 req.rtm.rtm_protocol = RTPROT_KERNEL;
596 req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
597 req.rtm.rtm_type = type;
598
599 rta.rta_dst = &dst;
600 rta.rta_prefsrc = &ifa->ifa_local;
601 rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
602
603 if (cmd == RTM_NEWROUTE)
604 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
605 else
606 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
607}
608
609static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
610{
611
612 fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
613
614#if 0
615 if (!(dev->flags&IFF_UP))
616 return;
617 /* In the future, we will want to add default routes here */
618
619#endif
620}
621
622static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
623{
624 int found_it = 0;
625 struct net_device *dev;
626 struct dn_dev *dn_db;
627 struct dn_ifaddr *ifa2;
628
629 ASSERT_RTNL();
630
631 /* Scan device list */
632 read_lock(&dev_base_lock);
633 for(dev = dev_base; dev; dev = dev->next) {
634 dn_db = dev->dn_ptr;
635 if (dn_db == NULL)
636 continue;
637 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
638 if (ifa2->ifa_local == ifa->ifa_local) {
639 found_it = 1;
640 break;
641 }
642 }
643 }
644 read_unlock(&dev_base_lock);
645
646 if (found_it == 0) {
647 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
648
649 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
650 if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
651 dn_fib_flush();
652 }
653 }
654}
655
656static void dn_fib_disable_addr(struct net_device *dev, int force)
657{
658 if (dn_fib_sync_down(0, dev, force))
659 dn_fib_flush();
660 dn_rt_cache_flush(0);
661 neigh_ifdown(&dn_neigh_table, dev);
662}
663
664static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
665{
666 struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
667
668 switch(event) {
669 case NETDEV_UP:
670 dn_fib_add_ifaddr(ifa);
671 dn_fib_sync_up(ifa->ifa_dev->dev);
672 dn_rt_cache_flush(-1);
673 break;
674 case NETDEV_DOWN:
675 dn_fib_del_ifaddr(ifa);
676 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
677 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
678 } else {
679 dn_rt_cache_flush(-1);
680 }
681 break;
682 }
683 return NOTIFY_DONE;
684}
685
686int dn_fib_sync_down(dn_address local, struct net_device *dev, int force)
687{
688 int ret = 0;
689 int scope = RT_SCOPE_NOWHERE;
690
691 if (force)
692 scope = -1;
693
694 for_fib_info() {
695 /*
696 * This makes no sense for DECnet.... we will almost
697 * certainly have more than one local address the same
698 * over all our interfaces. It needs thinking about
699 * some more.
700 */
701 if (local && fi->fib_prefsrc == local) {
702 fi->fib_flags |= RTNH_F_DEAD;
703 ret++;
704 } else if (dev && fi->fib_nhs) {
705 int dead = 0;
706
707 change_nexthops(fi) {
708 if (nh->nh_flags&RTNH_F_DEAD)
709 dead++;
710 else if (nh->nh_dev == dev &&
711 nh->nh_scope != scope) {
712 spin_lock_bh(&dn_fib_multipath_lock);
713 nh->nh_flags |= RTNH_F_DEAD;
714 fi->fib_power -= nh->nh_power;
715 nh->nh_power = 0;
716 spin_unlock_bh(&dn_fib_multipath_lock);
717 dead++;
718 }
719 } endfor_nexthops(fi)
720 if (dead == fi->fib_nhs) {
721 fi->fib_flags |= RTNH_F_DEAD;
722 ret++;
723 }
724 }
725 } endfor_fib_info();
726 return ret;
727}
728
729
730int dn_fib_sync_up(struct net_device *dev)
731{
732 int ret = 0;
733
734 if (!(dev->flags&IFF_UP))
735 return 0;
736
737 for_fib_info() {
738 int alive = 0;
739
740 change_nexthops(fi) {
741 if (!(nh->nh_flags&RTNH_F_DEAD)) {
742 alive++;
743 continue;
744 }
745 if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
746 continue;
747 if (nh->nh_dev != dev || dev->dn_ptr == NULL)
748 continue;
749 alive++;
750 spin_lock_bh(&dn_fib_multipath_lock);
751 nh->nh_power = 0;
752 nh->nh_flags &= ~RTNH_F_DEAD;
753 spin_unlock_bh(&dn_fib_multipath_lock);
754 } endfor_nexthops(fi);
755
756 if (alive > 0) {
757 fi->fib_flags &= ~RTNH_F_DEAD;
758 ret++;
759 }
760 } endfor_fib_info();
761 return ret;
762}
763
764void dn_fib_flush(void)
765{
766 int flushed = 0;
767 struct dn_fib_table *tb;
768 int id;
769
770 for(id = RT_TABLE_MAX; id > 0; id--) {
771 if ((tb = dn_fib_get_table(id, 0)) == NULL)
772 continue;
773 flushed += tb->flush(tb);
774 }
775
776 if (flushed)
777 dn_rt_cache_flush(-1);
778}
779
780static struct notifier_block dn_fib_dnaddr_notifier = {
781 .notifier_call = dn_fib_dnaddr_event,
782};
783
784void __exit dn_fib_cleanup(void)
785{
786 dn_fib_table_cleanup();
787 dn_fib_rules_cleanup();
788
789 unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
790}
791
792
793void __init dn_fib_init(void)
794{
795
796 dn_fib_table_init();
797 dn_fib_rules_init();
798
799 register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
800}
801
802
diff --git a/net/decnet/dn_neigh.c b/net/decnet/dn_neigh.c
new file mode 100644
index 000000000000..f6dfe96f45b7
--- /dev/null
+++ b/net/decnet/dn_neigh.c
@@ -0,0 +1,627 @@
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Neighbour Functions (Adjacency Database and
7 * On-Ethernet Cache)
8 *
9 * Author: Steve Whitehouse <SteveW@ACM.org>
10 *
11 *
12 * Changes:
13 * Steve Whitehouse : Fixed router listing routine
14 * Steve Whitehouse : Added error_report functions
15 * Steve Whitehouse : Added default router detection
16 * Steve Whitehouse : Hop counts in outgoing messages
17 * Steve Whitehouse : Fixed src/dst in outgoing messages so
18 * forwarding now stands a good chance of
19 * working.
20 * Steve Whitehouse : Fixed neighbour states (for now anyway).
21 * Steve Whitehouse : Made error_report functions dummies. This
22 * is not the right place to return skbs.
23 * Steve Whitehouse : Convert to seq_file
24 *
25 */
26
27#include <linux/config.h>
28#include <linux/net.h>
29#include <linux/module.h>
30#include <linux/socket.h>
31#include <linux/if_arp.h>
32#include <linux/if_ether.h>
33#include <linux/init.h>
34#include <linux/proc_fs.h>
35#include <linux/string.h>
36#include <linux/netfilter_decnet.h>
37#include <linux/spinlock.h>
38#include <linux/seq_file.h>
39#include <linux/rcupdate.h>
40#include <linux/jhash.h>
41#include <asm/atomic.h>
42#include <net/neighbour.h>
43#include <net/dst.h>
44#include <net/flow.h>
45#include <net/dn.h>
46#include <net/dn_dev.h>
47#include <net/dn_neigh.h>
48#include <net/dn_route.h>
49
50static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev);
51static int dn_neigh_construct(struct neighbour *);
52static void dn_long_error_report(struct neighbour *, struct sk_buff *);
53static void dn_short_error_report(struct neighbour *, struct sk_buff *);
54static int dn_long_output(struct sk_buff *);
55static int dn_short_output(struct sk_buff *);
56static int dn_phase3_output(struct sk_buff *);
57
58
59/*
60 * For talking to broadcast devices: Ethernet & PPP
61 */
62static struct neigh_ops dn_long_ops = {
63 .family = AF_DECnet,
64 .error_report = dn_long_error_report,
65 .output = dn_long_output,
66 .connected_output = dn_long_output,
67 .hh_output = dev_queue_xmit,
68 .queue_xmit = dev_queue_xmit,
69};
70
71/*
72 * For talking to pointopoint and multidrop devices: DDCMP and X.25
73 */
74static struct neigh_ops dn_short_ops = {
75 .family = AF_DECnet,
76 .error_report = dn_short_error_report,
77 .output = dn_short_output,
78 .connected_output = dn_short_output,
79 .hh_output = dev_queue_xmit,
80 .queue_xmit = dev_queue_xmit,
81};
82
83/*
84 * For talking to DECnet phase III nodes
85 */
86static struct neigh_ops dn_phase3_ops = {
87 .family = AF_DECnet,
88 .error_report = dn_short_error_report, /* Can use short version here */
89 .output = dn_phase3_output,
90 .connected_output = dn_phase3_output,
91 .hh_output = dev_queue_xmit,
92 .queue_xmit = dev_queue_xmit
93};
94
95struct neigh_table dn_neigh_table = {
96 .family = PF_DECnet,
97 .entry_size = sizeof(struct dn_neigh),
98 .key_len = sizeof(dn_address),
99 .hash = dn_neigh_hash,
100 .constructor = dn_neigh_construct,
101 .id = "dn_neigh_cache",
102 .parms ={
103 .tbl = &dn_neigh_table,
104 .entries = 0,
105 .base_reachable_time = 30 * HZ,
106 .retrans_time = 1 * HZ,
107 .gc_staletime = 60 * HZ,
108 .reachable_time = 30 * HZ,
109 .delay_probe_time = 5 * HZ,
110 .queue_len = 3,
111 .ucast_probes = 0,
112 .app_probes = 0,
113 .mcast_probes = 0,
114 .anycast_delay = 0,
115 .proxy_delay = 0,
116 .proxy_qlen = 0,
117 .locktime = 1 * HZ,
118 },
119 .gc_interval = 30 * HZ,
120 .gc_thresh1 = 128,
121 .gc_thresh2 = 512,
122 .gc_thresh3 = 1024,
123};
124
125static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev)
126{
127 return jhash_2words(*(dn_address *)pkey, 0, dn_neigh_table.hash_rnd);
128}
129
130static int dn_neigh_construct(struct neighbour *neigh)
131{
132 struct net_device *dev = neigh->dev;
133 struct dn_neigh *dn = (struct dn_neigh *)neigh;
134 struct dn_dev *dn_db;
135 struct neigh_parms *parms;
136
137 rcu_read_lock();
138 dn_db = rcu_dereference(dev->dn_ptr);
139 if (dn_db == NULL) {
140 rcu_read_unlock();
141 return -EINVAL;
142 }
143
144 parms = dn_db->neigh_parms;
145 if (!parms) {
146 rcu_read_unlock();
147 return -EINVAL;
148 }
149
150 __neigh_parms_put(neigh->parms);
151 neigh->parms = neigh_parms_clone(parms);
152 rcu_read_unlock();
153
154 if (dn_db->use_long)
155 neigh->ops = &dn_long_ops;
156 else
157 neigh->ops = &dn_short_ops;
158
159 if (dn->flags & DN_NDFLAG_P3)
160 neigh->ops = &dn_phase3_ops;
161
162 neigh->nud_state = NUD_NOARP;
163 neigh->output = neigh->ops->connected_output;
164
165 if ((dev->type == ARPHRD_IPGRE) || (dev->flags & IFF_POINTOPOINT))
166 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
167 else if ((dev->type == ARPHRD_ETHER) || (dev->type == ARPHRD_LOOPBACK))
168 dn_dn2eth(neigh->ha, dn->addr);
169 else {
170 if (net_ratelimit())
171 printk(KERN_DEBUG "Trying to create neigh for hw %d\n", dev->type);
172 return -EINVAL;
173 }
174
175 /*
176 * Make an estimate of the remote block size by assuming that its
177 * two less then the device mtu, which it true for ethernet (and
178 * other things which support long format headers) since there is
179 * an extra length field (of 16 bits) which isn't part of the
180 * ethernet headers and which the DECnet specs won't admit is part
181 * of the DECnet routing headers either.
182 *
183 * If we over estimate here its no big deal, the NSP negotiations
184 * will prevent us from sending packets which are too large for the
185 * remote node to handle. In any case this figure is normally updated
186 * by a hello message in most cases.
187 */
188 dn->blksize = dev->mtu - 2;
189
190 return 0;
191}
192
193static void dn_long_error_report(struct neighbour *neigh, struct sk_buff *skb)
194{
195 printk(KERN_DEBUG "dn_long_error_report: called\n");
196 kfree_skb(skb);
197}
198
199
200static void dn_short_error_report(struct neighbour *neigh, struct sk_buff *skb)
201{
202 printk(KERN_DEBUG "dn_short_error_report: called\n");
203 kfree_skb(skb);
204}
205
206static int dn_neigh_output_packet(struct sk_buff *skb)
207{
208 struct dst_entry *dst = skb->dst;
209 struct dn_route *rt = (struct dn_route *)dst;
210 struct neighbour *neigh = dst->neighbour;
211 struct net_device *dev = neigh->dev;
212 char mac_addr[ETH_ALEN];
213
214 dn_dn2eth(mac_addr, rt->rt_local_src);
215 if (!dev->hard_header || dev->hard_header(skb, dev, ntohs(skb->protocol), neigh->ha, mac_addr, skb->len) >= 0)
216 return neigh->ops->queue_xmit(skb);
217
218 if (net_ratelimit())
219 printk(KERN_DEBUG "dn_neigh_output_packet: oops, can't send packet\n");
220
221 kfree_skb(skb);
222 return -EINVAL;
223}
224
225static int dn_long_output(struct sk_buff *skb)
226{
227 struct dst_entry *dst = skb->dst;
228 struct neighbour *neigh = dst->neighbour;
229 struct net_device *dev = neigh->dev;
230 int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3;
231 unsigned char *data;
232 struct dn_long_packet *lp;
233 struct dn_skb_cb *cb = DN_SKB_CB(skb);
234
235
236 if (skb_headroom(skb) < headroom) {
237 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
238 if (skb2 == NULL) {
239 if (net_ratelimit())
240 printk(KERN_CRIT "dn_long_output: no memory\n");
241 kfree_skb(skb);
242 return -ENOBUFS;
243 }
244 kfree_skb(skb);
245 skb = skb2;
246 if (net_ratelimit())
247 printk(KERN_INFO "dn_long_output: Increasing headroom\n");
248 }
249
250 data = skb_push(skb, sizeof(struct dn_long_packet) + 3);
251 lp = (struct dn_long_packet *)(data+3);
252
253 *((unsigned short *)data) = dn_htons(skb->len - 2);
254 *(data + 2) = 1 | DN_RT_F_PF; /* Padding */
255
256 lp->msgflg = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS));
257 lp->d_area = lp->d_subarea = 0;
258 dn_dn2eth(lp->d_id, dn_ntohs(cb->dst));
259 lp->s_area = lp->s_subarea = 0;
260 dn_dn2eth(lp->s_id, dn_ntohs(cb->src));
261 lp->nl2 = 0;
262 lp->visit_ct = cb->hops & 0x3f;
263 lp->s_class = 0;
264 lp->pt = 0;
265
266 skb->nh.raw = skb->data;
267
268 return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
269}
270
271static int dn_short_output(struct sk_buff *skb)
272{
273 struct dst_entry *dst = skb->dst;
274 struct neighbour *neigh = dst->neighbour;
275 struct net_device *dev = neigh->dev;
276 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
277 struct dn_short_packet *sp;
278 unsigned char *data;
279 struct dn_skb_cb *cb = DN_SKB_CB(skb);
280
281
282 if (skb_headroom(skb) < headroom) {
283 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
284 if (skb2 == NULL) {
285 if (net_ratelimit())
286 printk(KERN_CRIT "dn_short_output: no memory\n");
287 kfree_skb(skb);
288 return -ENOBUFS;
289 }
290 kfree_skb(skb);
291 skb = skb2;
292 if (net_ratelimit())
293 printk(KERN_INFO "dn_short_output: Increasing headroom\n");
294 }
295
296 data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
297 *((unsigned short *)data) = dn_htons(skb->len - 2);
298 sp = (struct dn_short_packet *)(data+2);
299
300 sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
301 sp->dstnode = cb->dst;
302 sp->srcnode = cb->src;
303 sp->forward = cb->hops & 0x3f;
304
305 skb->nh.raw = skb->data;
306
307 return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
308}
309
310/*
311 * Phase 3 output is the same is short output, execpt that
312 * it clears the area bits before transmission.
313 */
314static int dn_phase3_output(struct sk_buff *skb)
315{
316 struct dst_entry *dst = skb->dst;
317 struct neighbour *neigh = dst->neighbour;
318 struct net_device *dev = neigh->dev;
319 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
320 struct dn_short_packet *sp;
321 unsigned char *data;
322 struct dn_skb_cb *cb = DN_SKB_CB(skb);
323
324 if (skb_headroom(skb) < headroom) {
325 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
326 if (skb2 == NULL) {
327 if (net_ratelimit())
328 printk(KERN_CRIT "dn_phase3_output: no memory\n");
329 kfree_skb(skb);
330 return -ENOBUFS;
331 }
332 kfree_skb(skb);
333 skb = skb2;
334 if (net_ratelimit())
335 printk(KERN_INFO "dn_phase3_output: Increasing headroom\n");
336 }
337
338 data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
339 *((unsigned short *)data) = dn_htons(skb->len - 2);
340 sp = (struct dn_short_packet *)(data + 2);
341
342 sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
343 sp->dstnode = cb->dst & dn_htons(0x03ff);
344 sp->srcnode = cb->src & dn_htons(0x03ff);
345 sp->forward = cb->hops & 0x3f;
346
347 skb->nh.raw = skb->data;
348
349 return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
350}
351
352/*
353 * Unfortunately, the neighbour code uses the device in its hash
354 * function, so we don't get any advantage from it. This function
355 * basically does a neigh_lookup(), but without comparing the device
356 * field. This is required for the On-Ethernet cache
357 */
358
359/*
360 * Pointopoint link receives a hello message
361 */
362void dn_neigh_pointopoint_hello(struct sk_buff *skb)
363{
364 kfree_skb(skb);
365}
366
367/*
368 * Ethernet router hello message received
369 */
370int dn_neigh_router_hello(struct sk_buff *skb)
371{
372 struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data;
373
374 struct neighbour *neigh;
375 struct dn_neigh *dn;
376 struct dn_dev *dn_db;
377 dn_address src;
378
379 src = dn_htons(dn_eth2dn(msg->id));
380
381 neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
382
383 dn = (struct dn_neigh *)neigh;
384
385 if (neigh) {
386 write_lock(&neigh->lock);
387
388 neigh->used = jiffies;
389 dn_db = (struct dn_dev *)neigh->dev->dn_ptr;
390
391 if (!(neigh->nud_state & NUD_PERMANENT)) {
392 neigh->updated = jiffies;
393
394 if (neigh->dev->type == ARPHRD_ETHER)
395 memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
396
397 dn->blksize = dn_ntohs(msg->blksize);
398 dn->priority = msg->priority;
399
400 dn->flags &= ~DN_NDFLAG_P3;
401
402 switch(msg->iinfo & DN_RT_INFO_TYPE) {
403 case DN_RT_INFO_L1RT:
404 dn->flags &=~DN_NDFLAG_R2;
405 dn->flags |= DN_NDFLAG_R1;
406 break;
407 case DN_RT_INFO_L2RT:
408 dn->flags |= DN_NDFLAG_R2;
409 }
410 }
411
412 if (!dn_db->router) {
413 dn_db->router = neigh_clone(neigh);
414 } else {
415 if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
416 neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
417 }
418 write_unlock(&neigh->lock);
419 neigh_release(neigh);
420 }
421
422 kfree_skb(skb);
423 return 0;
424}
425
426/*
427 * Endnode hello message received
428 */
429int dn_neigh_endnode_hello(struct sk_buff *skb)
430{
431 struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data;
432 struct neighbour *neigh;
433 struct dn_neigh *dn;
434 dn_address src;
435
436 src = dn_htons(dn_eth2dn(msg->id));
437
438 neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
439
440 dn = (struct dn_neigh *)neigh;
441
442 if (neigh) {
443 write_lock(&neigh->lock);
444
445 neigh->used = jiffies;
446
447 if (!(neigh->nud_state & NUD_PERMANENT)) {
448 neigh->updated = jiffies;
449
450 if (neigh->dev->type == ARPHRD_ETHER)
451 memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
452 dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2);
453 dn->blksize = dn_ntohs(msg->blksize);
454 dn->priority = 0;
455 }
456
457 write_unlock(&neigh->lock);
458 neigh_release(neigh);
459 }
460
461 kfree_skb(skb);
462 return 0;
463}
464
465static char *dn_find_slot(char *base, int max, int priority)
466{
467 int i;
468 unsigned char *min = NULL;
469
470 base += 6; /* skip first id */
471
472 for(i = 0; i < max; i++) {
473 if (!min || (*base < *min))
474 min = base;
475 base += 7; /* find next priority */
476 }
477
478 if (!min)
479 return NULL;
480
481 return (*min < priority) ? (min - 6) : NULL;
482}
483
484struct elist_cb_state {
485 struct net_device *dev;
486 unsigned char *ptr;
487 unsigned char *rs;
488 int t, n;
489};
490
491static void neigh_elist_cb(struct neighbour *neigh, void *_info)
492{
493 struct elist_cb_state *s = _info;
494 struct dn_dev *dn_db;
495 struct dn_neigh *dn;
496
497 if (neigh->dev != s->dev)
498 return;
499
500 dn = (struct dn_neigh *) neigh;
501 if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2)))
502 return;
503
504 dn_db = (struct dn_dev *) s->dev->dn_ptr;
505 if (dn_db->parms.forwarding == 1 && (dn->flags & DN_NDFLAG_R2))
506 return;
507
508 if (s->t == s->n)
509 s->rs = dn_find_slot(s->ptr, s->n, dn->priority);
510 else
511 s->t++;
512 if (s->rs == NULL)
513 return;
514
515 dn_dn2eth(s->rs, dn->addr);
516 s->rs += 6;
517 *(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0;
518 *(s->rs) |= dn->priority;
519 s->rs++;
520}
521
522int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n)
523{
524 struct elist_cb_state state;
525
526 state.dev = dev;
527 state.t = 0;
528 state.n = n;
529 state.ptr = ptr;
530 state.rs = ptr;
531
532 neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state);
533
534 return state.t;
535}
536
537
538#ifdef CONFIG_PROC_FS
539
540static inline void dn_neigh_format_entry(struct seq_file *seq,
541 struct neighbour *n)
542{
543 struct dn_neigh *dn = (struct dn_neigh *) n;
544 char buf[DN_ASCBUF_LEN];
545
546 read_lock(&n->lock);
547 seq_printf(seq, "%-7s %s%s%s %02x %02d %07ld %-8s\n",
548 dn_addr2asc(dn_ntohs(dn->addr), buf),
549 (dn->flags&DN_NDFLAG_R1) ? "1" : "-",
550 (dn->flags&DN_NDFLAG_R2) ? "2" : "-",
551 (dn->flags&DN_NDFLAG_P3) ? "3" : "-",
552 dn->n.nud_state,
553 atomic_read(&dn->n.refcnt),
554 dn->blksize,
555 (dn->n.dev) ? dn->n.dev->name : "?");
556 read_unlock(&n->lock);
557}
558
559static int dn_neigh_seq_show(struct seq_file *seq, void *v)
560{
561 if (v == SEQ_START_TOKEN) {
562 seq_puts(seq, "Addr Flags State Use Blksize Dev\n");
563 } else {
564 dn_neigh_format_entry(seq, v);
565 }
566
567 return 0;
568}
569
570static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos)
571{
572 return neigh_seq_start(seq, pos, &dn_neigh_table,
573 NEIGH_SEQ_NEIGH_ONLY);
574}
575
576static struct seq_operations dn_neigh_seq_ops = {
577 .start = dn_neigh_seq_start,
578 .next = neigh_seq_next,
579 .stop = neigh_seq_stop,
580 .show = dn_neigh_seq_show,
581};
582
583static int dn_neigh_seq_open(struct inode *inode, struct file *file)
584{
585 struct seq_file *seq;
586 int rc = -ENOMEM;
587 struct neigh_seq_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
588
589 if (!s)
590 goto out;
591
592 memset(s, 0, sizeof(*s));
593 rc = seq_open(file, &dn_neigh_seq_ops);
594 if (rc)
595 goto out_kfree;
596
597 seq = file->private_data;
598 seq->private = s;
599 memset(s, 0, sizeof(*s));
600out:
601 return rc;
602out_kfree:
603 kfree(s);
604 goto out;
605}
606
607static struct file_operations dn_neigh_seq_fops = {
608 .owner = THIS_MODULE,
609 .open = dn_neigh_seq_open,
610 .read = seq_read,
611 .llseek = seq_lseek,
612 .release = seq_release_private,
613};
614
615#endif
616
617void __init dn_neigh_init(void)
618{
619 neigh_table_init(&dn_neigh_table);
620 proc_net_fops_create("decnet_neigh", S_IRUGO, &dn_neigh_seq_fops);
621}
622
623void __exit dn_neigh_cleanup(void)
624{
625 proc_net_remove("decnet_neigh");
626 neigh_table_clear(&dn_neigh_table);
627}
diff --git a/net/decnet/dn_nsp_in.c b/net/decnet/dn_nsp_in.c
new file mode 100644
index 000000000000..202dbde9850d
--- /dev/null
+++ b/net/decnet/dn_nsp_in.c
@@ -0,0 +1,934 @@
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Network Services Protocol (Input)
7 *
8 * Author: Eduardo Marcelo Serrat <emserrat@geocities.com>
9 *
10 * Changes:
11 *
12 * Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from
13 * original dn_nsp.c.
14 * Steve Whitehouse: Updated to work with my new routing architecture.
15 * Steve Whitehouse: Add changes from Eduardo Serrat's patches.
16 * Steve Whitehouse: Put all ack handling code in a common routine.
17 * Steve Whitehouse: Put other common bits into dn_nsp_rx()
18 * Steve Whitehouse: More checks on skb->len to catch bogus packets
19 * Fixed various race conditions and possible nasties.
20 * Steve Whitehouse: Now handles returned conninit frames.
21 * David S. Miller: New socket locking
22 * Steve Whitehouse: Fixed lockup when socket filtering was enabled.
23 * Paul Koning: Fix to push CC sockets into RUN when acks are
24 * received.
25 * Steve Whitehouse:
26 * Patrick Caulfield: Checking conninits for correctness & sending of error
27 * responses.
28 * Steve Whitehouse: Added backlog congestion level return codes.
29 * Patrick Caulfield:
30 * Steve Whitehouse: Added flow control support (outbound)
31 * Steve Whitehouse: Prepare for nonlinear skbs
32 */
33
34/******************************************************************************
35 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
36
37 This program is free software; you can redistribute it and/or modify
38 it under the terms of the GNU General Public License as published by
39 the Free Software Foundation; either version 2 of the License, or
40 any later version.
41
42 This program is distributed in the hope that it will be useful,
43 but WITHOUT ANY WARRANTY; without even the implied warranty of
44 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
45 GNU General Public License for more details.
46*******************************************************************************/
47
48#include <linux/config.h>
49#include <linux/errno.h>
50#include <linux/types.h>
51#include <linux/socket.h>
52#include <linux/in.h>
53#include <linux/kernel.h>
54#include <linux/sched.h>
55#include <linux/timer.h>
56#include <linux/string.h>
57#include <linux/sockios.h>
58#include <linux/net.h>
59#include <linux/netdevice.h>
60#include <linux/inet.h>
61#include <linux/route.h>
62#include <net/sock.h>
63#include <net/tcp.h>
64#include <asm/system.h>
65#include <linux/fcntl.h>
66#include <linux/mm.h>
67#include <linux/termios.h>
68#include <linux/interrupt.h>
69#include <linux/proc_fs.h>
70#include <linux/stat.h>
71#include <linux/init.h>
72#include <linux/poll.h>
73#include <linux/netfilter_decnet.h>
74#include <net/neighbour.h>
75#include <net/dst.h>
76#include <net/dn.h>
77#include <net/dn_nsp.h>
78#include <net/dn_dev.h>
79#include <net/dn_route.h>
80
81extern int decnet_log_martians;
82
83static void dn_log_martian(struct sk_buff *skb, const char *msg)
84{
85 if (decnet_log_martians && net_ratelimit()) {
86 char *devname = skb->dev ? skb->dev->name : "???";
87 struct dn_skb_cb *cb = DN_SKB_CB(skb);
88 printk(KERN_INFO "DECnet: Martian packet (%s) dev=%s src=0x%04hx dst=0x%04hx srcport=0x%04hx dstport=0x%04hx\n", msg, devname, cb->src, cb->dst, cb->src_port, cb->dst_port);
89 }
90}
91
92/*
93 * For this function we've flipped the cross-subchannel bit
94 * if the message is an otherdata or linkservice message. Thus
95 * we can use it to work out what to update.
96 */
97static void dn_ack(struct sock *sk, struct sk_buff *skb, unsigned short ack)
98{
99 struct dn_scp *scp = DN_SK(sk);
100 unsigned short type = ((ack >> 12) & 0x0003);
101 int wakeup = 0;
102
103 switch(type) {
104 case 0: /* ACK - Data */
105 if (dn_after(ack, scp->ackrcv_dat)) {
106 scp->ackrcv_dat = ack & 0x0fff;
107 wakeup |= dn_nsp_check_xmit_queue(sk, skb, &scp->data_xmit_queue, ack);
108 }
109 break;
110 case 1: /* NAK - Data */
111 break;
112 case 2: /* ACK - OtherData */
113 if (dn_after(ack, scp->ackrcv_oth)) {
114 scp->ackrcv_oth = ack & 0x0fff;
115 wakeup |= dn_nsp_check_xmit_queue(sk, skb, &scp->other_xmit_queue, ack);
116 }
117 break;
118 case 3: /* NAK - OtherData */
119 break;
120 }
121
122 if (wakeup && !sock_flag(sk, SOCK_DEAD))
123 sk->sk_state_change(sk);
124}
125
126/*
127 * This function is a universal ack processor.
128 */
129static int dn_process_ack(struct sock *sk, struct sk_buff *skb, int oth)
130{
131 unsigned short *ptr = (unsigned short *)skb->data;
132 int len = 0;
133 unsigned short ack;
134
135 if (skb->len < 2)
136 return len;
137
138 if ((ack = dn_ntohs(*ptr)) & 0x8000) {
139 skb_pull(skb, 2);
140 ptr++;
141 len += 2;
142 if ((ack & 0x4000) == 0) {
143 if (oth)
144 ack ^= 0x2000;
145 dn_ack(sk, skb, ack);
146 }
147 }
148
149 if (skb->len < 2)
150 return len;
151
152 if ((ack = dn_ntohs(*ptr)) & 0x8000) {
153 skb_pull(skb, 2);
154 len += 2;
155 if ((ack & 0x4000) == 0) {
156 if (oth)
157 ack ^= 0x2000;
158 dn_ack(sk, skb, ack);
159 }
160 }
161
162 return len;
163}
164
165
166/**
167 * dn_check_idf - Check an image data field format is correct.
168 * @pptr: Pointer to pointer to image data
169 * @len: Pointer to length of image data
170 * @max: The maximum allowed length of the data in the image data field
171 * @follow_on: Check that this many bytes exist beyond the end of the image data
172 *
173 * Returns: 0 if ok, -1 on error
174 */
175static inline int dn_check_idf(unsigned char **pptr, int *len, unsigned char max, unsigned char follow_on)
176{
177 unsigned char *ptr = *pptr;
178 unsigned char flen = *ptr++;
179
180 (*len)--;
181 if (flen > max)
182 return -1;
183 if ((flen + follow_on) > *len)
184 return -1;
185
186 *len -= flen;
187 *pptr = ptr + flen;
188 return 0;
189}
190
191/*
192 * Table of reason codes to pass back to node which sent us a badly
193 * formed message, plus text messages for the log. A zero entry in
194 * the reason field means "don't reply" otherwise a disc init is sent with
195 * the specified reason code.
196 */
197static struct {
198 unsigned short reason;
199 const char *text;
200} ci_err_table[] = {
201 { 0, "CI: Truncated message" },
202 { NSP_REASON_ID, "CI: Destination username error" },
203 { NSP_REASON_ID, "CI: Destination username type" },
204 { NSP_REASON_US, "CI: Source username error" },
205 { 0, "CI: Truncated at menuver" },
206 { 0, "CI: Truncated before access or user data" },
207 { NSP_REASON_IO, "CI: Access data format error" },
208 { NSP_REASON_IO, "CI: User data format error" }
209};
210
211/*
212 * This function uses a slightly different lookup method
213 * to find its sockets, since it searches on object name/number
214 * rather than port numbers. Various tests are done to ensure that
215 * the incoming data is in the correct format before it is queued to
216 * a socket.
217 */
218static struct sock *dn_find_listener(struct sk_buff *skb, unsigned short *reason)
219{
220 struct dn_skb_cb *cb = DN_SKB_CB(skb);
221 struct nsp_conn_init_msg *msg = (struct nsp_conn_init_msg *)skb->data;
222 struct sockaddr_dn dstaddr;
223 struct sockaddr_dn srcaddr;
224 unsigned char type = 0;
225 int dstlen;
226 int srclen;
227 unsigned char *ptr;
228 int len;
229 int err = 0;
230 unsigned char menuver;
231
232 memset(&dstaddr, 0, sizeof(struct sockaddr_dn));
233 memset(&srcaddr, 0, sizeof(struct sockaddr_dn));
234
235 /*
236 * 1. Decode & remove message header
237 */
238 cb->src_port = msg->srcaddr;
239 cb->dst_port = msg->dstaddr;
240 cb->services = msg->services;
241 cb->info = msg->info;
242 cb->segsize = dn_ntohs(msg->segsize);
243
244 if (!pskb_may_pull(skb, sizeof(*msg)))
245 goto err_out;
246
247 skb_pull(skb, sizeof(*msg));
248
249 len = skb->len;
250 ptr = skb->data;
251
252 /*
253 * 2. Check destination end username format
254 */
255 dstlen = dn_username2sockaddr(ptr, len, &dstaddr, &type);
256 err++;
257 if (dstlen < 0)
258 goto err_out;
259
260 err++;
261 if (type > 1)
262 goto err_out;
263
264 len -= dstlen;
265 ptr += dstlen;
266
267 /*
268 * 3. Check source end username format
269 */
270 srclen = dn_username2sockaddr(ptr, len, &srcaddr, &type);
271 err++;
272 if (srclen < 0)
273 goto err_out;
274
275 len -= srclen;
276 ptr += srclen;
277 err++;
278 if (len < 1)
279 goto err_out;
280
281 menuver = *ptr;
282 ptr++;
283 len--;
284
285 /*
286 * 4. Check that optional data actually exists if menuver says it does
287 */
288 err++;
289 if ((menuver & (DN_MENUVER_ACC | DN_MENUVER_USR)) && (len < 1))
290 goto err_out;
291
292 /*
293 * 5. Check optional access data format
294 */
295 err++;
296 if (menuver & DN_MENUVER_ACC) {
297 if (dn_check_idf(&ptr, &len, 39, 1))
298 goto err_out;
299 if (dn_check_idf(&ptr, &len, 39, 1))
300 goto err_out;
301 if (dn_check_idf(&ptr, &len, 39, (menuver & DN_MENUVER_USR) ? 1 : 0))
302 goto err_out;
303 }
304
305 /*
306 * 6. Check optional user data format
307 */
308 err++;
309 if (menuver & DN_MENUVER_USR) {
310 if (dn_check_idf(&ptr, &len, 16, 0))
311 goto err_out;
312 }
313
314 /*
315 * 7. Look up socket based on destination end username
316 */
317 return dn_sklist_find_listener(&dstaddr);
318err_out:
319 dn_log_martian(skb, ci_err_table[err].text);
320 *reason = ci_err_table[err].reason;
321 return NULL;
322}
323
324
325static void dn_nsp_conn_init(struct sock *sk, struct sk_buff *skb)
326{
327 if (sk_acceptq_is_full(sk)) {
328 kfree_skb(skb);
329 return;
330 }
331
332 sk->sk_ack_backlog++;
333 skb_queue_tail(&sk->sk_receive_queue, skb);
334 sk->sk_state_change(sk);
335}
336
337static void dn_nsp_conn_conf(struct sock *sk, struct sk_buff *skb)
338{
339 struct dn_skb_cb *cb = DN_SKB_CB(skb);
340 struct dn_scp *scp = DN_SK(sk);
341 unsigned char *ptr;
342
343 if (skb->len < 4)
344 goto out;
345
346 ptr = skb->data;
347 cb->services = *ptr++;
348 cb->info = *ptr++;
349 cb->segsize = dn_ntohs(*(__u16 *)ptr);
350
351 if ((scp->state == DN_CI) || (scp->state == DN_CD)) {
352 scp->persist = 0;
353 scp->addrrem = cb->src_port;
354 sk->sk_state = TCP_ESTABLISHED;
355 scp->state = DN_RUN;
356 scp->services_rem = cb->services;
357 scp->info_rem = cb->info;
358 scp->segsize_rem = cb->segsize;
359
360 if ((scp->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
361 scp->max_window = decnet_no_fc_max_cwnd;
362
363 if (skb->len > 0) {
364 unsigned char dlen = *skb->data;
365 if ((dlen <= 16) && (dlen <= skb->len)) {
366 scp->conndata_in.opt_optl = dlen;
367 memcpy(scp->conndata_in.opt_data, skb->data + 1, dlen);
368 }
369 }
370 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
371 if (!sock_flag(sk, SOCK_DEAD))
372 sk->sk_state_change(sk);
373 }
374
375out:
376 kfree_skb(skb);
377}
378
379static void dn_nsp_conn_ack(struct sock *sk, struct sk_buff *skb)
380{
381 struct dn_scp *scp = DN_SK(sk);
382
383 if (scp->state == DN_CI) {
384 scp->state = DN_CD;
385 scp->persist = 0;
386 }
387
388 kfree_skb(skb);
389}
390
391static void dn_nsp_disc_init(struct sock *sk, struct sk_buff *skb)
392{
393 struct dn_scp *scp = DN_SK(sk);
394 struct dn_skb_cb *cb = DN_SKB_CB(skb);
395 unsigned short reason;
396
397 if (skb->len < 2)
398 goto out;
399
400 reason = dn_ntohs(*(__u16 *)skb->data);
401 skb_pull(skb, 2);
402
403 scp->discdata_in.opt_status = reason;
404 scp->discdata_in.opt_optl = 0;
405 memset(scp->discdata_in.opt_data, 0, 16);
406
407 if (skb->len > 0) {
408 unsigned char dlen = *skb->data;
409 if ((dlen <= 16) && (dlen <= skb->len)) {
410 scp->discdata_in.opt_optl = dlen;
411 memcpy(scp->discdata_in.opt_data, skb->data + 1, dlen);
412 }
413 }
414
415 scp->addrrem = cb->src_port;
416 sk->sk_state = TCP_CLOSE;
417
418 switch(scp->state) {
419 case DN_CI:
420 case DN_CD:
421 scp->state = DN_RJ;
422 sk->sk_err = ECONNREFUSED;
423 break;
424 case DN_RUN:
425 sk->sk_shutdown |= SHUTDOWN_MASK;
426 scp->state = DN_DN;
427 break;
428 case DN_DI:
429 scp->state = DN_DIC;
430 break;
431 }
432
433 if (!sock_flag(sk, SOCK_DEAD)) {
434 if (sk->sk_socket->state != SS_UNCONNECTED)
435 sk->sk_socket->state = SS_DISCONNECTING;
436 sk->sk_state_change(sk);
437 }
438
439 /*
440 * It appears that its possible for remote machines to send disc
441 * init messages with no port identifier if we are in the CI and
442 * possibly also the CD state. Obviously we shouldn't reply with
443 * a message if we don't know what the end point is.
444 */
445 if (scp->addrrem) {
446 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
447 }
448 scp->persist_fxn = dn_destroy_timer;
449 scp->persist = dn_nsp_persist(sk);
450
451out:
452 kfree_skb(skb);
453}
454
455/*
456 * disc_conf messages are also called no_resources or no_link
457 * messages depending upon the "reason" field.
458 */
459static void dn_nsp_disc_conf(struct sock *sk, struct sk_buff *skb)
460{
461 struct dn_scp *scp = DN_SK(sk);
462 unsigned short reason;
463
464 if (skb->len != 2)
465 goto out;
466
467 reason = dn_ntohs(*(__u16 *)skb->data);
468
469 sk->sk_state = TCP_CLOSE;
470
471 switch(scp->state) {
472 case DN_CI:
473 scp->state = DN_NR;
474 break;
475 case DN_DR:
476 if (reason == NSP_REASON_DC)
477 scp->state = DN_DRC;
478 if (reason == NSP_REASON_NL)
479 scp->state = DN_CN;
480 break;
481 case DN_DI:
482 scp->state = DN_DIC;
483 break;
484 case DN_RUN:
485 sk->sk_shutdown |= SHUTDOWN_MASK;
486 case DN_CC:
487 scp->state = DN_CN;
488 }
489
490 if (!sock_flag(sk, SOCK_DEAD)) {
491 if (sk->sk_socket->state != SS_UNCONNECTED)
492 sk->sk_socket->state = SS_DISCONNECTING;
493 sk->sk_state_change(sk);
494 }
495
496 scp->persist_fxn = dn_destroy_timer;
497 scp->persist = dn_nsp_persist(sk);
498
499out:
500 kfree_skb(skb);
501}
502
503static void dn_nsp_linkservice(struct sock *sk, struct sk_buff *skb)
504{
505 struct dn_scp *scp = DN_SK(sk);
506 unsigned short segnum;
507 unsigned char lsflags;
508 signed char fcval;
509 int wake_up = 0;
510 char *ptr = skb->data;
511 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
512
513 if (skb->len != 4)
514 goto out;
515
516 segnum = dn_ntohs(*(__u16 *)ptr);
517 ptr += 2;
518 lsflags = *(unsigned char *)ptr++;
519 fcval = *ptr;
520
521 /*
522 * Here we ignore erronous packets which should really
523 * should cause a connection abort. It is not critical
524 * for now though.
525 */
526 if (lsflags & 0xf8)
527 goto out;
528
529 if (seq_next(scp->numoth_rcv, segnum)) {
530 seq_add(&scp->numoth_rcv, 1);
531 switch(lsflags & 0x04) { /* FCVAL INT */
532 case 0x00: /* Normal Request */
533 switch(lsflags & 0x03) { /* FCVAL MOD */
534 case 0x00: /* Request count */
535 if (fcval < 0) {
536 unsigned char p_fcval = -fcval;
537 if ((scp->flowrem_dat > p_fcval) &&
538 (fctype == NSP_FC_SCMC)) {
539 scp->flowrem_dat -= p_fcval;
540 }
541 } else if (fcval > 0) {
542 scp->flowrem_dat += fcval;
543 wake_up = 1;
544 }
545 break;
546 case 0x01: /* Stop outgoing data */
547 scp->flowrem_sw = DN_DONTSEND;
548 break;
549 case 0x02: /* Ok to start again */
550 scp->flowrem_sw = DN_SEND;
551 dn_nsp_output(sk);
552 wake_up = 1;
553 }
554 break;
555 case 0x04: /* Interrupt Request */
556 if (fcval > 0) {
557 scp->flowrem_oth += fcval;
558 wake_up = 1;
559 }
560 break;
561 }
562 if (wake_up && !sock_flag(sk, SOCK_DEAD))
563 sk->sk_state_change(sk);
564 }
565
566 dn_nsp_send_oth_ack(sk);
567
568out:
569 kfree_skb(skb);
570}
571
572/*
573 * Copy of sock_queue_rcv_skb (from sock.h) without
574 * bh_lock_sock() (its already held when this is called) which
575 * also allows data and other data to be queued to a socket.
576 */
577static __inline__ int dn_queue_skb(struct sock *sk, struct sk_buff *skb, int sig, struct sk_buff_head *queue)
578{
579 int err;
580
581 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
582 number of warnings when compiling with -W --ANK
583 */
584 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
585 (unsigned)sk->sk_rcvbuf) {
586 err = -ENOMEM;
587 goto out;
588 }
589
590 err = sk_filter(sk, skb, 0);
591 if (err)
592 goto out;
593
594 skb_set_owner_r(skb, sk);
595 skb_queue_tail(queue, skb);
596
597 /* This code only runs from BH or BH protected context.
598 * Therefore the plain read_lock is ok here. -DaveM
599 */
600 read_lock(&sk->sk_callback_lock);
601 if (!sock_flag(sk, SOCK_DEAD)) {
602 struct socket *sock = sk->sk_socket;
603 wake_up_interruptible(sk->sk_sleep);
604 if (sock && sock->fasync_list &&
605 !test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
606 __kill_fasync(sock->fasync_list, sig,
607 (sig == SIGURG) ? POLL_PRI : POLL_IN);
608 }
609 read_unlock(&sk->sk_callback_lock);
610out:
611 return err;
612}
613
614static void dn_nsp_otherdata(struct sock *sk, struct sk_buff *skb)
615{
616 struct dn_scp *scp = DN_SK(sk);
617 unsigned short segnum;
618 struct dn_skb_cb *cb = DN_SKB_CB(skb);
619 int queued = 0;
620
621 if (skb->len < 2)
622 goto out;
623
624 cb->segnum = segnum = dn_ntohs(*(__u16 *)skb->data);
625 skb_pull(skb, 2);
626
627 if (seq_next(scp->numoth_rcv, segnum)) {
628
629 if (dn_queue_skb(sk, skb, SIGURG, &scp->other_receive_queue) == 0) {
630 seq_add(&scp->numoth_rcv, 1);
631 scp->other_report = 0;
632 queued = 1;
633 }
634 }
635
636 dn_nsp_send_oth_ack(sk);
637out:
638 if (!queued)
639 kfree_skb(skb);
640}
641
642static void dn_nsp_data(struct sock *sk, struct sk_buff *skb)
643{
644 int queued = 0;
645 unsigned short segnum;
646 struct dn_skb_cb *cb = DN_SKB_CB(skb);
647 struct dn_scp *scp = DN_SK(sk);
648
649 if (skb->len < 2)
650 goto out;
651
652 cb->segnum = segnum = dn_ntohs(*(__u16 *)skb->data);
653 skb_pull(skb, 2);
654
655 if (seq_next(scp->numdat_rcv, segnum)) {
656 if (dn_queue_skb(sk, skb, SIGIO, &sk->sk_receive_queue) == 0) {
657 seq_add(&scp->numdat_rcv, 1);
658 queued = 1;
659 }
660
661 if ((scp->flowloc_sw == DN_SEND) && dn_congested(sk)) {
662 scp->flowloc_sw = DN_DONTSEND;
663 dn_nsp_send_link(sk, DN_DONTSEND, 0);
664 }
665 }
666
667 dn_nsp_send_data_ack(sk);
668out:
669 if (!queued)
670 kfree_skb(skb);
671}
672
673/*
674 * If one of our conninit messages is returned, this function
675 * deals with it. It puts the socket into the NO_COMMUNICATION
676 * state.
677 */
678static void dn_returned_conn_init(struct sock *sk, struct sk_buff *skb)
679{
680 struct dn_scp *scp = DN_SK(sk);
681
682 if (scp->state == DN_CI) {
683 scp->state = DN_NC;
684 sk->sk_state = TCP_CLOSE;
685 if (!sock_flag(sk, SOCK_DEAD))
686 sk->sk_state_change(sk);
687 }
688
689 kfree_skb(skb);
690}
691
692static int dn_nsp_no_socket(struct sk_buff *skb, unsigned short reason)
693{
694 struct dn_skb_cb *cb = DN_SKB_CB(skb);
695 int ret = NET_RX_DROP;
696
697 /* Must not reply to returned packets */
698 if (cb->rt_flags & DN_RT_F_RTS)
699 goto out;
700
701 if ((reason != NSP_REASON_OK) && ((cb->nsp_flags & 0x0c) == 0x08)) {
702 switch(cb->nsp_flags & 0x70) {
703 case 0x10:
704 case 0x60: /* (Retransmitted) Connect Init */
705 dn_nsp_return_disc(skb, NSP_DISCINIT, reason);
706 ret = NET_RX_SUCCESS;
707 break;
708 case 0x20: /* Connect Confirm */
709 dn_nsp_return_disc(skb, NSP_DISCCONF, reason);
710 ret = NET_RX_SUCCESS;
711 break;
712 }
713 }
714
715out:
716 kfree_skb(skb);
717 return ret;
718}
719
720static int dn_nsp_rx_packet(struct sk_buff *skb)
721{
722 struct dn_skb_cb *cb = DN_SKB_CB(skb);
723 struct sock *sk = NULL;
724 unsigned char *ptr = (unsigned char *)skb->data;
725 unsigned short reason = NSP_REASON_NL;
726
727 if (!pskb_may_pull(skb, 2))
728 goto free_out;
729
730 skb->h.raw = skb->data;
731 cb->nsp_flags = *ptr++;
732
733 if (decnet_debug_level & 2)
734 printk(KERN_DEBUG "dn_nsp_rx: Message type 0x%02x\n", (int)cb->nsp_flags);
735
736 if (cb->nsp_flags & 0x83)
737 goto free_out;
738
739 /*
740 * Filter out conninits and useless packet types
741 */
742 if ((cb->nsp_flags & 0x0c) == 0x08) {
743 switch(cb->nsp_flags & 0x70) {
744 case 0x00: /* NOP */
745 case 0x70: /* Reserved */
746 case 0x50: /* Reserved, Phase II node init */
747 goto free_out;
748 case 0x10:
749 case 0x60:
750 if (unlikely(cb->rt_flags & DN_RT_F_RTS))
751 goto free_out;
752 sk = dn_find_listener(skb, &reason);
753 goto got_it;
754 }
755 }
756
757 if (!pskb_may_pull(skb, 3))
758 goto free_out;
759
760 /*
761 * Grab the destination address.
762 */
763 cb->dst_port = *(unsigned short *)ptr;
764 cb->src_port = 0;
765 ptr += 2;
766
767 /*
768 * If not a connack, grab the source address too.
769 */
770 if (pskb_may_pull(skb, 5)) {
771 cb->src_port = *(unsigned short *)ptr;
772 ptr += 2;
773 skb_pull(skb, 5);
774 }
775
776 /*
777 * Returned packets...
778 * Swap src & dst and look up in the normal way.
779 */
780 if (unlikely(cb->rt_flags & DN_RT_F_RTS)) {
781 unsigned short tmp = cb->dst_port;
782 cb->dst_port = cb->src_port;
783 cb->src_port = tmp;
784 tmp = cb->dst;
785 cb->dst = cb->src;
786 cb->src = tmp;
787 }
788
789 /*
790 * Find the socket to which this skb is destined.
791 */
792 sk = dn_find_by_skb(skb);
793got_it:
794 if (sk != NULL) {
795 struct dn_scp *scp = DN_SK(sk);
796 int ret;
797
798 /* Reset backoff */
799 scp->nsp_rxtshift = 0;
800
801 /*
802 * We linearize everything except data segments here.
803 */
804 if (cb->nsp_flags & ~0x60) {
805 if (unlikely(skb_is_nonlinear(skb)) &&
806 skb_linearize(skb, GFP_ATOMIC) != 0)
807 goto free_out;
808 }
809
810 bh_lock_sock(sk);
811 ret = NET_RX_SUCCESS;
812 if (decnet_debug_level & 8)
813 printk(KERN_DEBUG "NSP: 0x%02x 0x%02x 0x%04x 0x%04x %d\n",
814 (int)cb->rt_flags, (int)cb->nsp_flags,
815 (int)cb->src_port, (int)cb->dst_port,
816 !!sock_owned_by_user(sk));
817 if (!sock_owned_by_user(sk))
818 ret = dn_nsp_backlog_rcv(sk, skb);
819 else
820 sk_add_backlog(sk, skb);
821 bh_unlock_sock(sk);
822 sock_put(sk);
823
824 return ret;
825 }
826
827 return dn_nsp_no_socket(skb, reason);
828
829free_out:
830 kfree_skb(skb);
831 return NET_RX_DROP;
832}
833
834int dn_nsp_rx(struct sk_buff *skb)
835{
836 return NF_HOOK(PF_DECnet, NF_DN_LOCAL_IN, skb, skb->dev, NULL, dn_nsp_rx_packet);
837}
838
839/*
840 * This is the main receive routine for sockets. It is called
841 * from the above when the socket is not busy, and also from
842 * sock_release() when there is a backlog queued up.
843 */
844int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
845{
846 struct dn_scp *scp = DN_SK(sk);
847 struct dn_skb_cb *cb = DN_SKB_CB(skb);
848
849 if (cb->rt_flags & DN_RT_F_RTS) {
850 if (cb->nsp_flags == 0x18 || cb->nsp_flags == 0x68)
851 dn_returned_conn_init(sk, skb);
852 else
853 kfree_skb(skb);
854 return NET_RX_SUCCESS;
855 }
856
857 /*
858 * Control packet.
859 */
860 if ((cb->nsp_flags & 0x0c) == 0x08) {
861 switch(cb->nsp_flags & 0x70) {
862 case 0x10:
863 case 0x60:
864 dn_nsp_conn_init(sk, skb);
865 break;
866 case 0x20:
867 dn_nsp_conn_conf(sk, skb);
868 break;
869 case 0x30:
870 dn_nsp_disc_init(sk, skb);
871 break;
872 case 0x40:
873 dn_nsp_disc_conf(sk, skb);
874 break;
875 }
876
877 } else if (cb->nsp_flags == 0x24) {
878 /*
879 * Special for connacks, 'cos they don't have
880 * ack data or ack otherdata info.
881 */
882 dn_nsp_conn_ack(sk, skb);
883 } else {
884 int other = 1;
885
886 /* both data and ack frames can kick a CC socket into RUN */
887 if ((scp->state == DN_CC) && !sock_flag(sk, SOCK_DEAD)) {
888 scp->state = DN_RUN;
889 sk->sk_state = TCP_ESTABLISHED;
890 sk->sk_state_change(sk);
891 }
892
893 if ((cb->nsp_flags & 0x1c) == 0)
894 other = 0;
895 if (cb->nsp_flags == 0x04)
896 other = 0;
897
898 /*
899 * Read out ack data here, this applies equally
900 * to data, other data, link serivce and both
901 * ack data and ack otherdata.
902 */
903 dn_process_ack(sk, skb, other);
904
905 /*
906 * If we've some sort of data here then call a
907 * suitable routine for dealing with it, otherwise
908 * the packet is an ack and can be discarded.
909 */
910 if ((cb->nsp_flags & 0x0c) == 0) {
911
912 if (scp->state != DN_RUN)
913 goto free_out;
914
915 switch(cb->nsp_flags) {
916 case 0x10: /* LS */
917 dn_nsp_linkservice(sk, skb);
918 break;
919 case 0x30: /* OD */
920 dn_nsp_otherdata(sk, skb);
921 break;
922 default:
923 dn_nsp_data(sk, skb);
924 }
925
926 } else { /* Ack, chuck it out here */
927free_out:
928 kfree_skb(skb);
929 }
930 }
931
932 return NET_RX_SUCCESS;
933}
934
diff --git a/net/decnet/dn_nsp_out.c b/net/decnet/dn_nsp_out.c
new file mode 100644
index 000000000000..42abbf3f524f
--- /dev/null
+++ b/net/decnet/dn_nsp_out.c
@@ -0,0 +1,782 @@
1
2/*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet Network Services Protocol (Output)
8 *
9 * Author: Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 *
13 * Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from
14 * original dn_nsp.c.
15 * Steve Whitehouse: Updated to work with my new routing architecture.
16 * Steve Whitehouse: Added changes from Eduardo Serrat's patches.
17 * Steve Whitehouse: Now conninits have the "return" bit set.
18 * Steve Whitehouse: Fixes to check alloc'd skbs are non NULL!
19 * Moved output state machine into one function
20 * Steve Whitehouse: New output state machine
21 * Paul Koning: Connect Confirm message fix.
22 * Eduardo Serrat: Fix to stop dn_nsp_do_disc() sending malformed packets.
23 * Steve Whitehouse: dn_nsp_output() and friends needed a spring clean
24 * Steve Whitehouse: Moved dn_nsp_send() in here from route.h
25 */
26
27/******************************************************************************
28 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
29
30 This program is free software; you can redistribute it and/or modify
31 it under the terms of the GNU General Public License as published by
32 the Free Software Foundation; either version 2 of the License, or
33 any later version.
34
35 This program is distributed in the hope that it will be useful,
36 but WITHOUT ANY WARRANTY; without even the implied warranty of
37 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
38 GNU General Public License for more details.
39*******************************************************************************/
40
41#include <linux/errno.h>
42#include <linux/types.h>
43#include <linux/socket.h>
44#include <linux/in.h>
45#include <linux/kernel.h>
46#include <linux/sched.h>
47#include <linux/timer.h>
48#include <linux/string.h>
49#include <linux/sockios.h>
50#include <linux/net.h>
51#include <linux/netdevice.h>
52#include <linux/inet.h>
53#include <linux/route.h>
54#include <net/sock.h>
55#include <asm/system.h>
56#include <linux/fcntl.h>
57#include <linux/mm.h>
58#include <linux/termios.h>
59#include <linux/interrupt.h>
60#include <linux/proc_fs.h>
61#include <linux/stat.h>
62#include <linux/init.h>
63#include <linux/poll.h>
64#include <linux/if_packet.h>
65#include <net/neighbour.h>
66#include <net/dst.h>
67#include <net/flow.h>
68#include <net/dn.h>
69#include <net/dn_nsp.h>
70#include <net/dn_dev.h>
71#include <net/dn_route.h>
72
73
74static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
75
76static void dn_nsp_send(struct sk_buff *skb)
77{
78 struct sock *sk = skb->sk;
79 struct dn_scp *scp = DN_SK(sk);
80 struct dst_entry *dst;
81 struct flowi fl;
82
83 skb->h.raw = skb->data;
84 scp->stamp = jiffies;
85
86 dst = sk_dst_check(sk, 0);
87 if (dst) {
88try_again:
89 skb->dst = dst;
90 dst_output(skb);
91 return;
92 }
93
94 memset(&fl, 0, sizeof(fl));
95 fl.oif = sk->sk_bound_dev_if;
96 fl.fld_src = dn_saddr2dn(&scp->addr);
97 fl.fld_dst = dn_saddr2dn(&scp->peer);
98 dn_sk_ports_copy(&fl, scp);
99 fl.proto = DNPROTO_NSP;
100 if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, 0) == 0) {
101 dst = sk_dst_get(sk);
102 sk->sk_route_caps = dst->dev->features;
103 goto try_again;
104 }
105
106 sk->sk_err = EHOSTUNREACH;
107 if (!sock_flag(sk, SOCK_DEAD))
108 sk->sk_state_change(sk);
109}
110
111
112/*
113 * If sk == NULL, then we assume that we are supposed to be making
114 * a routing layer skb. If sk != NULL, then we are supposed to be
115 * creating an skb for the NSP layer.
116 *
117 * The eventual aim is for each socket to have a cached header size
118 * for its outgoing packets, and to set hdr from this when sk != NULL.
119 */
120struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri)
121{
122 struct sk_buff *skb;
123 int hdr = 64;
124
125 if ((skb = alloc_skb(size + hdr, pri)) == NULL)
126 return NULL;
127
128 skb->protocol = __constant_htons(ETH_P_DNA_RT);
129 skb->pkt_type = PACKET_OUTGOING;
130
131 if (sk)
132 skb_set_owner_w(skb, sk);
133
134 skb_reserve(skb, hdr);
135
136 return skb;
137}
138
139/*
140 * Wrapper for the above, for allocs of data skbs. We try and get the
141 * whole size thats been asked for (plus 11 bytes of header). If this
142 * fails, then we try for any size over 16 bytes for SOCK_STREAMS.
143 */
144struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, long timeo, int *err)
145{
146 int space;
147 int len;
148 struct sk_buff *skb = NULL;
149
150 *err = 0;
151
152 while(skb == NULL) {
153 if (signal_pending(current)) {
154 *err = sock_intr_errno(timeo);
155 break;
156 }
157
158 if (sk->sk_shutdown & SEND_SHUTDOWN) {
159 *err = EINVAL;
160 break;
161 }
162
163 if (sk->sk_err)
164 break;
165
166 len = *size + 11;
167 space = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
168
169 if (space < len) {
170 if ((sk->sk_socket->type == SOCK_STREAM) &&
171 (space >= (16 + 11)))
172 len = space;
173 }
174
175 if (space < len) {
176 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
177 if (noblock) {
178 *err = EWOULDBLOCK;
179 break;
180 }
181
182 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
183 SOCK_SLEEP_PRE(sk)
184
185 if ((sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc)) <
186 len)
187 schedule();
188
189 SOCK_SLEEP_POST(sk)
190 continue;
191 }
192
193 if ((skb = dn_alloc_skb(sk, len, sk->sk_allocation)) == NULL)
194 continue;
195
196 *size = len - 11;
197 }
198
199 return skb;
200}
201
202/*
203 * Calculate persist timer based upon the smoothed round
204 * trip time and the variance. Backoff according to the
205 * nsp_backoff[] array.
206 */
207unsigned long dn_nsp_persist(struct sock *sk)
208{
209 struct dn_scp *scp = DN_SK(sk);
210
211 unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
212
213 t *= nsp_backoff[scp->nsp_rxtshift];
214
215 if (t < HZ) t = HZ;
216 if (t > (600*HZ)) t = (600*HZ);
217
218 if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT)
219 scp->nsp_rxtshift++;
220
221 /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */
222
223 return t;
224}
225
226/*
227 * This is called each time we get an estimate for the rtt
228 * on the link.
229 */
230static void dn_nsp_rtt(struct sock *sk, long rtt)
231{
232 struct dn_scp *scp = DN_SK(sk);
233 long srtt = (long)scp->nsp_srtt;
234 long rttvar = (long)scp->nsp_rttvar;
235 long delta;
236
237 /*
238 * If the jiffies clock flips over in the middle of timestamp
239 * gathering this value might turn out negative, so we make sure
240 * that is it always positive here.
241 */
242 if (rtt < 0)
243 rtt = -rtt;
244 /*
245 * Add new rtt to smoothed average
246 */
247 delta = ((rtt << 3) - srtt);
248 srtt += (delta >> 3);
249 if (srtt >= 1)
250 scp->nsp_srtt = (unsigned long)srtt;
251 else
252 scp->nsp_srtt = 1;
253
254 /*
255 * Add new rtt varience to smoothed varience
256 */
257 delta >>= 1;
258 rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2);
259 if (rttvar >= 1)
260 scp->nsp_rttvar = (unsigned long)rttvar;
261 else
262 scp->nsp_rttvar = 1;
263
264 /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */
265}
266
267/**
268 * dn_nsp_clone_and_send - Send a data packet by cloning it
269 * @skb: The packet to clone and transmit
270 * @gfp: memory allocation flag
271 *
272 * Clone a queued data or other data packet and transmit it.
273 *
274 * Returns: The number of times the packet has been sent previously
275 */
276static inline unsigned dn_nsp_clone_and_send(struct sk_buff *skb, int gfp)
277{
278 struct dn_skb_cb *cb = DN_SKB_CB(skb);
279 struct sk_buff *skb2;
280 int ret = 0;
281
282 if ((skb2 = skb_clone(skb, gfp)) != NULL) {
283 ret = cb->xmit_count;
284 cb->xmit_count++;
285 cb->stamp = jiffies;
286 skb2->sk = skb->sk;
287 dn_nsp_send(skb2);
288 }
289
290 return ret;
291}
292
293/**
294 * dn_nsp_output - Try and send something from socket queues
295 * @sk: The socket whose queues are to be investigated
296 * @gfp: The memory allocation flags
297 *
298 * Try and send the packet on the end of the data and other data queues.
299 * Other data gets priority over data, and if we retransmit a packet we
300 * reduce the window by dividing it in two.
301 *
302 */
303void dn_nsp_output(struct sock *sk)
304{
305 struct dn_scp *scp = DN_SK(sk);
306 struct sk_buff *skb;
307 unsigned reduce_win = 0;
308
309 /*
310 * First we check for otherdata/linkservice messages
311 */
312 if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL)
313 reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
314
315 /*
316 * If we may not send any data, we don't.
317 * If we are still trying to get some other data down the
318 * channel, we don't try and send any data.
319 */
320 if (reduce_win || (scp->flowrem_sw != DN_SEND))
321 goto recalc_window;
322
323 if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL)
324 reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
325
326 /*
327 * If we've sent any frame more than once, we cut the
328 * send window size in half. There is always a minimum
329 * window size of one available.
330 */
331recalc_window:
332 if (reduce_win) {
333 scp->snd_window >>= 1;
334 if (scp->snd_window < NSP_MIN_WINDOW)
335 scp->snd_window = NSP_MIN_WINDOW;
336 }
337}
338
339int dn_nsp_xmit_timeout(struct sock *sk)
340{
341 struct dn_scp *scp = DN_SK(sk);
342
343 dn_nsp_output(sk);
344
345 if (skb_queue_len(&scp->data_xmit_queue) || skb_queue_len(&scp->other_xmit_queue))
346 scp->persist = dn_nsp_persist(sk);
347
348 return 0;
349}
350
351static inline unsigned char *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len)
352{
353 unsigned char *ptr = skb_push(skb, len);
354
355 BUG_ON(len < 5);
356
357 *ptr++ = msgflag;
358 *((unsigned short *)ptr) = scp->addrrem;
359 ptr += 2;
360 *((unsigned short *)ptr) = scp->addrloc;
361 ptr += 2;
362 return ptr;
363}
364
365static unsigned short *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other)
366{
367 struct dn_scp *scp = DN_SK(sk);
368 unsigned short acknum = scp->numdat_rcv & 0x0FFF;
369 unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
370 unsigned short *ptr;
371
372 BUG_ON(hlen < 9);
373
374 scp->ackxmt_dat = acknum;
375 scp->ackxmt_oth = ackcrs;
376 acknum |= 0x8000;
377 ackcrs |= 0x8000;
378
379 /* If this is an "other data/ack" message, swap acknum and ackcrs */
380 if (other) {
381 unsigned short tmp = acknum;
382 acknum = ackcrs;
383 ackcrs = tmp;
384 }
385
386 /* Set "cross subchannel" bit in ackcrs */
387 ackcrs |= 0x2000;
388
389 ptr = (unsigned short *)dn_mk_common_header(scp, skb, msgflag, hlen);
390
391 *ptr++ = dn_htons(acknum);
392 *ptr++ = dn_htons(ackcrs);
393
394 return ptr;
395}
396
397static unsigned short *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
398{
399 struct dn_scp *scp = DN_SK(sk);
400 struct dn_skb_cb *cb = DN_SKB_CB(skb);
401 unsigned short *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);
402
403 if (unlikely(oth)) {
404 cb->segnum = scp->numoth;
405 seq_add(&scp->numoth, 1);
406 } else {
407 cb->segnum = scp->numdat;
408 seq_add(&scp->numdat, 1);
409 }
410 *(ptr++) = dn_htons(cb->segnum);
411
412 return ptr;
413}
414
415void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, int gfp, int oth)
416{
417 struct dn_scp *scp = DN_SK(sk);
418 struct dn_skb_cb *cb = DN_SKB_CB(skb);
419 unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
420
421 cb->xmit_count = 0;
422 dn_nsp_mk_data_header(sk, skb, oth);
423
424 /*
425 * Slow start: If we have been idle for more than
426 * one RTT, then reset window to min size.
427 */
428 if ((jiffies - scp->stamp) > t)
429 scp->snd_window = NSP_MIN_WINDOW;
430
431 if (oth)
432 skb_queue_tail(&scp->other_xmit_queue, skb);
433 else
434 skb_queue_tail(&scp->data_xmit_queue, skb);
435
436 if (scp->flowrem_sw != DN_SEND)
437 return;
438
439 dn_nsp_clone_and_send(skb, gfp);
440}
441
442
443int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum)
444{
445 struct dn_skb_cb *cb = DN_SKB_CB(skb);
446 struct dn_scp *scp = DN_SK(sk);
447 struct sk_buff *skb2, *list, *ack = NULL;
448 int wakeup = 0;
449 int try_retrans = 0;
450 unsigned long reftime = cb->stamp;
451 unsigned long pkttime;
452 unsigned short xmit_count;
453 unsigned short segnum;
454
455 skb2 = q->next;
456 list = (struct sk_buff *)q;
457 while(list != skb2) {
458 struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);
459
460 if (dn_before_or_equal(cb2->segnum, acknum))
461 ack = skb2;
462
463 /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */
464
465 skb2 = skb2->next;
466
467 if (ack == NULL)
468 continue;
469
470 /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */
471
472 /* Does _last_ packet acked have xmit_count > 1 */
473 try_retrans = 0;
474 /* Remember to wake up the sending process */
475 wakeup = 1;
476 /* Keep various statistics */
477 pkttime = cb2->stamp;
478 xmit_count = cb2->xmit_count;
479 segnum = cb2->segnum;
480 /* Remove and drop ack'ed packet */
481 skb_unlink(ack);
482 kfree_skb(ack);
483 ack = NULL;
484
485 /*
486 * We don't expect to see acknowledgements for packets we
487 * haven't sent yet.
488 */
489 WARN_ON(xmit_count == 0);
490
491 /*
492 * If the packet has only been sent once, we can use it
493 * to calculate the RTT and also open the window a little
494 * further.
495 */
496 if (xmit_count == 1) {
497 if (dn_equal(segnum, acknum))
498 dn_nsp_rtt(sk, (long)(pkttime - reftime));
499
500 if (scp->snd_window < scp->max_window)
501 scp->snd_window++;
502 }
503
504 /*
505 * Packet has been sent more than once. If this is the last
506 * packet to be acknowledged then we want to send the next
507 * packet in the send queue again (assumes the remote host does
508 * go-back-N error control).
509 */
510 if (xmit_count > 1)
511 try_retrans = 1;
512 }
513
514 if (try_retrans)
515 dn_nsp_output(sk);
516
517 return wakeup;
518}
519
520void dn_nsp_send_data_ack(struct sock *sk)
521{
522 struct sk_buff *skb = NULL;
523
524 if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
525 return;
526
527 skb_reserve(skb, 9);
528 dn_mk_ack_header(sk, skb, 0x04, 9, 0);
529 dn_nsp_send(skb);
530}
531
532void dn_nsp_send_oth_ack(struct sock *sk)
533{
534 struct sk_buff *skb = NULL;
535
536 if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
537 return;
538
539 skb_reserve(skb, 9);
540 dn_mk_ack_header(sk, skb, 0x14, 9, 1);
541 dn_nsp_send(skb);
542}
543
544
545void dn_send_conn_ack (struct sock *sk)
546{
547 struct dn_scp *scp = DN_SK(sk);
548 struct sk_buff *skb = NULL;
549 struct nsp_conn_ack_msg *msg;
550
551 if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
552 return;
553
554 msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3);
555 msg->msgflg = 0x24;
556 msg->dstaddr = scp->addrrem;
557
558 dn_nsp_send(skb);
559}
560
561void dn_nsp_delayed_ack(struct sock *sk)
562{
563 struct dn_scp *scp = DN_SK(sk);
564
565 if (scp->ackxmt_oth != scp->numoth_rcv)
566 dn_nsp_send_oth_ack(sk);
567
568 if (scp->ackxmt_dat != scp->numdat_rcv)
569 dn_nsp_send_data_ack(sk);
570}
571
572static int dn_nsp_retrans_conn_conf(struct sock *sk)
573{
574 struct dn_scp *scp = DN_SK(sk);
575
576 if (scp->state == DN_CC)
577 dn_send_conn_conf(sk, GFP_ATOMIC);
578
579 return 0;
580}
581
582void dn_send_conn_conf(struct sock *sk, int gfp)
583{
584 struct dn_scp *scp = DN_SK(sk);
585 struct sk_buff *skb = NULL;
586 struct nsp_conn_init_msg *msg;
587 unsigned char len = scp->conndata_out.opt_optl;
588
589 if ((skb = dn_alloc_skb(sk, 50 + scp->conndata_out.opt_optl, gfp)) == NULL)
590 return;
591
592 msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
593 msg->msgflg = 0x28;
594 msg->dstaddr = scp->addrrem;
595 msg->srcaddr = scp->addrloc;
596 msg->services = scp->services_loc;
597 msg->info = scp->info_loc;
598 msg->segsize = dn_htons(scp->segsize_loc);
599
600 *skb_put(skb,1) = len;
601
602 if (len > 0)
603 memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
604
605
606 dn_nsp_send(skb);
607
608 scp->persist = dn_nsp_persist(sk);
609 scp->persist_fxn = dn_nsp_retrans_conn_conf;
610}
611
612
613static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
614 unsigned short reason, int gfp, struct dst_entry *dst,
615 int ddl, unsigned char *dd, __u16 rem, __u16 loc)
616{
617 struct sk_buff *skb = NULL;
618 int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
619 unsigned char *msg;
620
621 if ((dst == NULL) || (rem == 0)) {
622 if (net_ratelimit())
623 printk(KERN_DEBUG "DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", (unsigned)rem, dst);
624 return;
625 }
626
627 if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
628 return;
629
630 msg = skb_put(skb, size);
631 *msg++ = msgflg;
632 *(__u16 *)msg = rem;
633 msg += 2;
634 *(__u16 *)msg = loc;
635 msg += 2;
636 *(__u16 *)msg = dn_htons(reason);
637 msg += 2;
638 if (msgflg == NSP_DISCINIT)
639 *msg++ = ddl;
640
641 if (ddl) {
642 memcpy(msg, dd, ddl);
643 }
644
645 /*
646 * This doesn't go via the dn_nsp_send() function since we need
647 * to be able to send disc packets out which have no socket
648 * associations.
649 */
650 skb->dst = dst_clone(dst);
651 dst_output(skb);
652}
653
654
655void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg,
656 unsigned short reason, int gfp)
657{
658 struct dn_scp *scp = DN_SK(sk);
659 int ddl = 0;
660
661 if (msgflg == NSP_DISCINIT)
662 ddl = scp->discdata_out.opt_optl;
663
664 if (reason == 0)
665 reason = scp->discdata_out.opt_status;
666
667 dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->sk_dst_cache, ddl,
668 scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
669}
670
671
672void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg,
673 unsigned short reason)
674{
675 struct dn_skb_cb *cb = DN_SKB_CB(skb);
676 int ddl = 0;
677 int gfp = GFP_ATOMIC;
678
679 dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb->dst, ddl,
680 NULL, cb->src_port, cb->dst_port);
681}
682
683
684void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval)
685{
686 struct dn_scp *scp = DN_SK(sk);
687 struct sk_buff *skb;
688 unsigned char *ptr;
689 int gfp = GFP_ATOMIC;
690
691 if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL)
692 return;
693
694 skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
695 ptr = skb_put(skb, 2);
696 DN_SKB_CB(skb)->nsp_flags = 0x10;
697 *ptr++ = lsflags;
698 *ptr = fcval;
699
700 dn_nsp_queue_xmit(sk, skb, gfp, 1);
701
702 scp->persist = dn_nsp_persist(sk);
703 scp->persist_fxn = dn_nsp_xmit_timeout;
704}
705
706static int dn_nsp_retrans_conninit(struct sock *sk)
707{
708 struct dn_scp *scp = DN_SK(sk);
709
710 if (scp->state == DN_CI)
711 dn_nsp_send_conninit(sk, NSP_RCI);
712
713 return 0;
714}
715
716void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
717{
718 struct dn_scp *scp = DN_SK(sk);
719 struct nsp_conn_init_msg *msg;
720 unsigned char aux;
721 unsigned char menuver;
722 struct dn_skb_cb *cb;
723 unsigned char type = 1;
724 int allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
725 struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);
726
727 if (!skb)
728 return;
729
730 cb = DN_SKB_CB(skb);
731 msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg));
732
733 msg->msgflg = msgflg;
734 msg->dstaddr = 0x0000; /* Remote Node will assign it*/
735
736 msg->srcaddr = scp->addrloc;
737 msg->services = scp->services_loc; /* Requested flow control */
738 msg->info = scp->info_loc; /* Version Number */
739 msg->segsize = dn_htons(scp->segsize_loc); /* Max segment size */
740
741 if (scp->peer.sdn_objnum)
742 type = 0;
743
744 skb_put(skb, dn_sockaddr2username(&scp->peer, skb->tail, type));
745 skb_put(skb, dn_sockaddr2username(&scp->addr, skb->tail, 2));
746
747 menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
748 if (scp->peer.sdn_flags & SDF_PROXY)
749 menuver |= DN_MENUVER_PRX;
750 if (scp->peer.sdn_flags & SDF_UICPROXY)
751 menuver |= DN_MENUVER_UIC;
752
753 *skb_put(skb, 1) = menuver; /* Menu Version */
754
755 aux = scp->accessdata.acc_userl;
756 *skb_put(skb, 1) = aux;
757 if (aux > 0)
758 memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);
759
760 aux = scp->accessdata.acc_passl;
761 *skb_put(skb, 1) = aux;
762 if (aux > 0)
763 memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);
764
765 aux = scp->accessdata.acc_accl;
766 *skb_put(skb, 1) = aux;
767 if (aux > 0)
768 memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);
769
770 aux = scp->conndata_out.opt_optl;
771 *skb_put(skb, 1) = aux;
772 if (aux > 0)
773 memcpy(skb_put(skb,aux), scp->conndata_out.opt_data, aux);
774
775 scp->persist = dn_nsp_persist(sk);
776 scp->persist_fxn = dn_nsp_retrans_conninit;
777
778 cb->rt_flags = DN_RT_F_RQR;
779
780 dn_nsp_send(skb);
781}
782
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
new file mode 100644
index 000000000000..1e7b5c3ea215
--- /dev/null
+++ b/net/decnet/dn_route.c
@@ -0,0 +1,1840 @@
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Routing Functions (Endnode and Router)
7 *
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 * Steve Whitehouse : Fixes to allow "intra-ethernet" and
13 * "return-to-sender" bits on outgoing
14 * packets.
15 * Steve Whitehouse : Timeouts for cached routes.
16 * Steve Whitehouse : Use dst cache for input routes too.
17 * Steve Whitehouse : Fixed error values in dn_send_skb.
18 * Steve Whitehouse : Rework routing functions to better fit
19 * DECnet routing design
20 * Alexey Kuznetsov : New SMP locking
21 * Steve Whitehouse : More SMP locking changes & dn_cache_dump()
22 * Steve Whitehouse : Prerouting NF hook, now really is prerouting.
23 * Fixed possible skb leak in rtnetlink funcs.
24 * Steve Whitehouse : Dave Miller's dynamic hash table sizing and
25 * Alexey Kuznetsov's finer grained locking
26 * from ipv4/route.c.
27 * Steve Whitehouse : Routing is now starting to look like a
28 * sensible set of code now, mainly due to
29 * my copying the IPv4 routing code. The
30 * hooks here are modified and will continue
31 * to evolve for a while.
32 * Steve Whitehouse : Real SMP at last :-) Also new netfilter
33 * stuff. Look out raw sockets your days
34 * are numbered!
35 * Steve Whitehouse : Added return-to-sender functions. Added
36 * backlog congestion level return codes.
37 * Steve Whitehouse : Fixed bug where routes were set up with
38 * no ref count on net devices.
39 * Steve Whitehouse : RCU for the route cache
40 * Steve Whitehouse : Preparations for the flow cache
41 * Steve Whitehouse : Prepare for nonlinear skbs
42 */
43
44/******************************************************************************
45 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
46
47 This program is free software; you can redistribute it and/or modify
48 it under the terms of the GNU General Public License as published by
49 the Free Software Foundation; either version 2 of the License, or
50 any later version.
51
52 This program is distributed in the hope that it will be useful,
53 but WITHOUT ANY WARRANTY; without even the implied warranty of
54 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
55 GNU General Public License for more details.
56*******************************************************************************/
57
58#include <linux/config.h>
59#include <linux/errno.h>
60#include <linux/types.h>
61#include <linux/socket.h>
62#include <linux/in.h>
63#include <linux/kernel.h>
64#include <linux/sockios.h>
65#include <linux/net.h>
66#include <linux/netdevice.h>
67#include <linux/inet.h>
68#include <linux/route.h>
69#include <linux/in_route.h>
70#include <net/sock.h>
71#include <linux/mm.h>
72#include <linux/proc_fs.h>
73#include <linux/seq_file.h>
74#include <linux/init.h>
75#include <linux/rtnetlink.h>
76#include <linux/string.h>
77#include <linux/netfilter_decnet.h>
78#include <linux/rcupdate.h>
79#include <linux/times.h>
80#include <asm/errno.h>
81#include <net/neighbour.h>
82#include <net/dst.h>
83#include <net/flow.h>
84#include <net/dn.h>
85#include <net/dn_dev.h>
86#include <net/dn_nsp.h>
87#include <net/dn_route.h>
88#include <net/dn_neigh.h>
89#include <net/dn_fib.h>
90
91struct dn_rt_hash_bucket
92{
93 struct dn_route *chain;
94 spinlock_t lock;
95} __attribute__((__aligned__(8)));
96
97extern struct neigh_table dn_neigh_table;
98
99
100static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
101
102static const int dn_rt_min_delay = 2 * HZ;
103static const int dn_rt_max_delay = 10 * HZ;
104static const int dn_rt_mtu_expires = 10 * 60 * HZ;
105
106static unsigned long dn_rt_deadline;
107
108static int dn_dst_gc(void);
109static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
110static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
111static void dn_dst_link_failure(struct sk_buff *);
112static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);
113static int dn_route_input(struct sk_buff *);
114static void dn_run_flush(unsigned long dummy);
115
116static struct dn_rt_hash_bucket *dn_rt_hash_table;
117static unsigned dn_rt_hash_mask;
118
119static struct timer_list dn_route_timer;
120static struct timer_list dn_rt_flush_timer =
121 TIMER_INITIALIZER(dn_run_flush, 0, 0);
122int decnet_dst_gc_interval = 2;
123
124static struct dst_ops dn_dst_ops = {
125 .family = PF_DECnet,
126 .protocol = __constant_htons(ETH_P_DNA_RT),
127 .gc_thresh = 128,
128 .gc = dn_dst_gc,
129 .check = dn_dst_check,
130 .negative_advice = dn_dst_negative_advice,
131 .link_failure = dn_dst_link_failure,
132 .update_pmtu = dn_dst_update_pmtu,
133 .entry_size = sizeof(struct dn_route),
134 .entries = ATOMIC_INIT(0),
135};
136
137static __inline__ unsigned dn_hash(unsigned short src, unsigned short dst)
138{
139 unsigned short tmp = src ^ dst;
140 tmp ^= (tmp >> 3);
141 tmp ^= (tmp >> 5);
142 tmp ^= (tmp >> 10);
143 return dn_rt_hash_mask & (unsigned)tmp;
144}
145
146static inline void dnrt_free(struct dn_route *rt)
147{
148 call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
149}
150
151static inline void dnrt_drop(struct dn_route *rt)
152{
153 if (rt)
154 dst_release(&rt->u.dst);
155 call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
156}
157
158static void dn_dst_check_expire(unsigned long dummy)
159{
160 int i;
161 struct dn_route *rt, **rtp;
162 unsigned long now = jiffies;
163 unsigned long expire = 120 * HZ;
164
165 for(i = 0; i <= dn_rt_hash_mask; i++) {
166 rtp = &dn_rt_hash_table[i].chain;
167
168 spin_lock(&dn_rt_hash_table[i].lock);
169 while((rt=*rtp) != NULL) {
170 if (atomic_read(&rt->u.dst.__refcnt) ||
171 (now - rt->u.dst.lastuse) < expire) {
172 rtp = &rt->u.rt_next;
173 continue;
174 }
175 *rtp = rt->u.rt_next;
176 rt->u.rt_next = NULL;
177 dnrt_free(rt);
178 }
179 spin_unlock(&dn_rt_hash_table[i].lock);
180
181 if ((jiffies - now) > 0)
182 break;
183 }
184
185 mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
186}
187
188static int dn_dst_gc(void)
189{
190 struct dn_route *rt, **rtp;
191 int i;
192 unsigned long now = jiffies;
193 unsigned long expire = 10 * HZ;
194
195 for(i = 0; i <= dn_rt_hash_mask; i++) {
196
197 spin_lock_bh(&dn_rt_hash_table[i].lock);
198 rtp = &dn_rt_hash_table[i].chain;
199
200 while((rt=*rtp) != NULL) {
201 if (atomic_read(&rt->u.dst.__refcnt) ||
202 (now - rt->u.dst.lastuse) < expire) {
203 rtp = &rt->u.rt_next;
204 continue;
205 }
206 *rtp = rt->u.rt_next;
207 rt->u.rt_next = NULL;
208 dnrt_drop(rt);
209 break;
210 }
211 spin_unlock_bh(&dn_rt_hash_table[i].lock);
212 }
213
214 return 0;
215}
216
217/*
218 * The decnet standards don't impose a particular minimum mtu, what they
219 * do insist on is that the routing layer accepts a datagram of at least
220 * 230 bytes long. Here we have to subtract the routing header length from
221 * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
222 * assume the worst and use a long header size.
223 *
224 * We update both the mtu and the advertised mss (i.e. the segment size we
225 * advertise to the other end).
226 */
227static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu)
228{
229 u32 min_mtu = 230;
230 struct dn_dev *dn = dst->neighbour ?
231 (struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL;
232
233 if (dn && dn->use_long == 0)
234 min_mtu -= 6;
235 else
236 min_mtu -= 21;
237
238 if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) {
239 if (!(dst_metric_locked(dst, RTAX_MTU))) {
240 dst->metrics[RTAX_MTU-1] = mtu;
241 dst_set_expires(dst, dn_rt_mtu_expires);
242 }
243 if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
244 u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
245 if (dst->metrics[RTAX_ADVMSS-1] > mss)
246 dst->metrics[RTAX_ADVMSS-1] = mss;
247 }
248 }
249}
250
251/*
252 * When a route has been marked obsolete. (e.g. routing cache flush)
253 */
254static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
255{
256 return NULL;
257}
258
259static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
260{
261 dst_release(dst);
262 return NULL;
263}
264
265static void dn_dst_link_failure(struct sk_buff *skb)
266{
267 return;
268}
269
270static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
271{
272 return memcmp(&fl1->nl_u.dn_u, &fl2->nl_u.dn_u, sizeof(fl1->nl_u.dn_u)) == 0 &&
273 fl1->oif == fl2->oif &&
274 fl1->iif == fl2->iif;
275}
276
277static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp)
278{
279 struct dn_route *rth, **rthp;
280 unsigned long now = jiffies;
281
282 rthp = &dn_rt_hash_table[hash].chain;
283
284 spin_lock_bh(&dn_rt_hash_table[hash].lock);
285 while((rth = *rthp) != NULL) {
286 if (compare_keys(&rth->fl, &rt->fl)) {
287 /* Put it first */
288 *rthp = rth->u.rt_next;
289 rcu_assign_pointer(rth->u.rt_next,
290 dn_rt_hash_table[hash].chain);
291 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
292
293 rth->u.dst.__use++;
294 dst_hold(&rth->u.dst);
295 rth->u.dst.lastuse = now;
296 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
297
298 dnrt_drop(rt);
299 *rp = rth;
300 return 0;
301 }
302 rthp = &rth->u.rt_next;
303 }
304
305 rcu_assign_pointer(rt->u.rt_next, dn_rt_hash_table[hash].chain);
306 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
307
308 dst_hold(&rt->u.dst);
309 rt->u.dst.__use++;
310 rt->u.dst.lastuse = now;
311 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
312 *rp = rt;
313 return 0;
314}
315
316void dn_run_flush(unsigned long dummy)
317{
318 int i;
319 struct dn_route *rt, *next;
320
321 for(i = 0; i < dn_rt_hash_mask; i++) {
322 spin_lock_bh(&dn_rt_hash_table[i].lock);
323
324 if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL)
325 goto nothing_to_declare;
326
327 for(; rt; rt=next) {
328 next = rt->u.rt_next;
329 rt->u.rt_next = NULL;
330 dst_free((struct dst_entry *)rt);
331 }
332
333nothing_to_declare:
334 spin_unlock_bh(&dn_rt_hash_table[i].lock);
335 }
336}
337
338static DEFINE_SPINLOCK(dn_rt_flush_lock);
339
340void dn_rt_cache_flush(int delay)
341{
342 unsigned long now = jiffies;
343 int user_mode = !in_interrupt();
344
345 if (delay < 0)
346 delay = dn_rt_min_delay;
347
348 spin_lock_bh(&dn_rt_flush_lock);
349
350 if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
351 long tmo = (long)(dn_rt_deadline - now);
352
353 if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
354 tmo = 0;
355
356 if (delay > tmo)
357 delay = tmo;
358 }
359
360 if (delay <= 0) {
361 spin_unlock_bh(&dn_rt_flush_lock);
362 dn_run_flush(0);
363 return;
364 }
365
366 if (dn_rt_deadline == 0)
367 dn_rt_deadline = now + dn_rt_max_delay;
368
369 dn_rt_flush_timer.expires = now + delay;
370 add_timer(&dn_rt_flush_timer);
371 spin_unlock_bh(&dn_rt_flush_lock);
372}
373
374/**
375 * dn_return_short - Return a short packet to its sender
376 * @skb: The packet to return
377 *
378 */
379static int dn_return_short(struct sk_buff *skb)
380{
381 struct dn_skb_cb *cb;
382 unsigned char *ptr;
383 dn_address *src;
384 dn_address *dst;
385 dn_address tmp;
386
387 /* Add back headers */
388 skb_push(skb, skb->data - skb->nh.raw);
389
390 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
391 return NET_RX_DROP;
392
393 cb = DN_SKB_CB(skb);
394 /* Skip packet length and point to flags */
395 ptr = skb->data + 2;
396 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
397
398 dst = (dn_address *)ptr;
399 ptr += 2;
400 src = (dn_address *)ptr;
401 ptr += 2;
402 *ptr = 0; /* Zero hop count */
403
404 /* Swap source and destination */
405 tmp = *src;
406 *src = *dst;
407 *dst = tmp;
408
409 skb->pkt_type = PACKET_OUTGOING;
410 dn_rt_finish_output(skb, NULL, NULL);
411 return NET_RX_SUCCESS;
412}
413
414/**
415 * dn_return_long - Return a long packet to its sender
416 * @skb: The long format packet to return
417 *
418 */
419static int dn_return_long(struct sk_buff *skb)
420{
421 struct dn_skb_cb *cb;
422 unsigned char *ptr;
423 unsigned char *src_addr, *dst_addr;
424 unsigned char tmp[ETH_ALEN];
425
426 /* Add back all headers */
427 skb_push(skb, skb->data - skb->nh.raw);
428
429 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
430 return NET_RX_DROP;
431
432 cb = DN_SKB_CB(skb);
433 /* Ignore packet length and point to flags */
434 ptr = skb->data + 2;
435
436 /* Skip padding */
437 if (*ptr & DN_RT_F_PF) {
438 char padlen = (*ptr & ~DN_RT_F_PF);
439 ptr += padlen;
440 }
441
442 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
443 ptr += 2;
444 dst_addr = ptr;
445 ptr += 8;
446 src_addr = ptr;
447 ptr += 6;
448 *ptr = 0; /* Zero hop count */
449
450 /* Swap source and destination */
451 memcpy(tmp, src_addr, ETH_ALEN);
452 memcpy(src_addr, dst_addr, ETH_ALEN);
453 memcpy(dst_addr, tmp, ETH_ALEN);
454
455 skb->pkt_type = PACKET_OUTGOING;
456 dn_rt_finish_output(skb, dst_addr, src_addr);
457 return NET_RX_SUCCESS;
458}
459
460/**
461 * dn_route_rx_packet - Try and find a route for an incoming packet
462 * @skb: The packet to find a route for
463 *
464 * Returns: result of input function if route is found, error code otherwise
465 */
466static int dn_route_rx_packet(struct sk_buff *skb)
467{
468 struct dn_skb_cb *cb = DN_SKB_CB(skb);
469 int err;
470
471 if ((err = dn_route_input(skb)) == 0)
472 return dst_input(skb);
473
474 if (decnet_debug_level & 4) {
475 char *devname = skb->dev ? skb->dev->name : "???";
476 struct dn_skb_cb *cb = DN_SKB_CB(skb);
477 printk(KERN_DEBUG
478 "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
479 (int)cb->rt_flags, devname, skb->len, cb->src, cb->dst,
480 err, skb->pkt_type);
481 }
482
483 if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
484 switch(cb->rt_flags & DN_RT_PKT_MSK) {
485 case DN_RT_PKT_SHORT:
486 return dn_return_short(skb);
487 case DN_RT_PKT_LONG:
488 return dn_return_long(skb);
489 }
490 }
491
492 kfree_skb(skb);
493 return NET_RX_DROP;
494}
495
496static int dn_route_rx_long(struct sk_buff *skb)
497{
498 struct dn_skb_cb *cb = DN_SKB_CB(skb);
499 unsigned char *ptr = skb->data;
500
501 if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
502 goto drop_it;
503
504 skb_pull(skb, 20);
505 skb->h.raw = skb->data;
506
507 /* Destination info */
508 ptr += 2;
509 cb->dst = dn_htons(dn_eth2dn(ptr));
510 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
511 goto drop_it;
512 ptr += 6;
513
514
515 /* Source info */
516 ptr += 2;
517 cb->src = dn_htons(dn_eth2dn(ptr));
518 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
519 goto drop_it;
520 ptr += 6;
521 /* Other junk */
522 ptr++;
523 cb->hops = *ptr++; /* Visit Count */
524
525 return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
526
527drop_it:
528 kfree_skb(skb);
529 return NET_RX_DROP;
530}
531
532
533
534static int dn_route_rx_short(struct sk_buff *skb)
535{
536 struct dn_skb_cb *cb = DN_SKB_CB(skb);
537 unsigned char *ptr = skb->data;
538
539 if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
540 goto drop_it;
541
542 skb_pull(skb, 5);
543 skb->h.raw = skb->data;
544
545 cb->dst = *(dn_address *)ptr;
546 ptr += 2;
547 cb->src = *(dn_address *)ptr;
548 ptr += 2;
549 cb->hops = *ptr & 0x3f;
550
551 return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
552
553drop_it:
554 kfree_skb(skb);
555 return NET_RX_DROP;
556}
557
558static int dn_route_discard(struct sk_buff *skb)
559{
560 /*
561 * I know we drop the packet here, but thats considered success in
562 * this case
563 */
564 kfree_skb(skb);
565 return NET_RX_SUCCESS;
566}
567
568static int dn_route_ptp_hello(struct sk_buff *skb)
569{
570 dn_dev_hello(skb);
571 dn_neigh_pointopoint_hello(skb);
572 return NET_RX_SUCCESS;
573}
574
575int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
576{
577 struct dn_skb_cb *cb;
578 unsigned char flags = 0;
579 __u16 len = dn_ntohs(*(__u16 *)skb->data);
580 struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr;
581 unsigned char padlen = 0;
582
583 if (dn == NULL)
584 goto dump_it;
585
586 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
587 goto out;
588
589 if (!pskb_may_pull(skb, 3))
590 goto dump_it;
591
592 skb_pull(skb, 2);
593
594 if (len > skb->len)
595 goto dump_it;
596
597 skb_trim(skb, len);
598
599 flags = *skb->data;
600
601 cb = DN_SKB_CB(skb);
602 cb->stamp = jiffies;
603 cb->iif = dev->ifindex;
604
605 /*
606 * If we have padding, remove it.
607 */
608 if (flags & DN_RT_F_PF) {
609 padlen = flags & ~DN_RT_F_PF;
610 if (!pskb_may_pull(skb, padlen + 1))
611 goto dump_it;
612 skb_pull(skb, padlen);
613 flags = *skb->data;
614 }
615
616 skb->nh.raw = skb->data;
617
618 /*
619 * Weed out future version DECnet
620 */
621 if (flags & DN_RT_F_VER)
622 goto dump_it;
623
624 cb->rt_flags = flags;
625
626 if (decnet_debug_level & 1)
627 printk(KERN_DEBUG
628 "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
629 (int)flags, (dev) ? dev->name : "???", len, skb->len,
630 padlen);
631
632 if (flags & DN_RT_PKT_CNTL) {
633 if (unlikely(skb_is_nonlinear(skb)) &&
634 skb_linearize(skb, GFP_ATOMIC) != 0)
635 goto dump_it;
636
637 switch(flags & DN_RT_CNTL_MSK) {
638 case DN_RT_PKT_INIT:
639 dn_dev_init_pkt(skb);
640 break;
641 case DN_RT_PKT_VERI:
642 dn_dev_veri_pkt(skb);
643 break;
644 }
645
646 if (dn->parms.state != DN_DEV_S_RU)
647 goto dump_it;
648
649 switch(flags & DN_RT_CNTL_MSK) {
650 case DN_RT_PKT_HELO:
651 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello);
652
653 case DN_RT_PKT_L1RT:
654 case DN_RT_PKT_L2RT:
655 return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard);
656 case DN_RT_PKT_ERTH:
657 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello);
658
659 case DN_RT_PKT_EEDH:
660 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello);
661 }
662 } else {
663 if (dn->parms.state != DN_DEV_S_RU)
664 goto dump_it;
665
666 skb_pull(skb, 1); /* Pull flags */
667
668 switch(flags & DN_RT_PKT_MSK) {
669 case DN_RT_PKT_LONG:
670 return dn_route_rx_long(skb);
671 case DN_RT_PKT_SHORT:
672 return dn_route_rx_short(skb);
673 }
674 }
675
676dump_it:
677 kfree_skb(skb);
678out:
679 return NET_RX_DROP;
680}
681
682static int dn_output(struct sk_buff *skb)
683{
684 struct dst_entry *dst = skb->dst;
685 struct dn_route *rt = (struct dn_route *)dst;
686 struct net_device *dev = dst->dev;
687 struct dn_skb_cb *cb = DN_SKB_CB(skb);
688 struct neighbour *neigh;
689
690 int err = -EINVAL;
691
692 if ((neigh = dst->neighbour) == NULL)
693 goto error;
694
695 skb->dev = dev;
696
697 cb->src = rt->rt_saddr;
698 cb->dst = rt->rt_daddr;
699
700 /*
701 * Always set the Intra-Ethernet bit on all outgoing packets
702 * originated on this node. Only valid flag from upper layers
703 * is return-to-sender-requested. Set hop count to 0 too.
704 */
705 cb->rt_flags &= ~DN_RT_F_RQR;
706 cb->rt_flags |= DN_RT_F_IE;
707 cb->hops = 0;
708
709 return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output);
710
711error:
712 if (net_ratelimit())
713 printk(KERN_DEBUG "dn_output: This should not happen\n");
714
715 kfree_skb(skb);
716
717 return err;
718}
719
720static int dn_forward(struct sk_buff *skb)
721{
722 struct dn_skb_cb *cb = DN_SKB_CB(skb);
723 struct dst_entry *dst = skb->dst;
724 struct dn_dev *dn_db = dst->dev->dn_ptr;
725 struct dn_route *rt;
726 struct neighbour *neigh = dst->neighbour;
727 int header_len;
728#ifdef CONFIG_NETFILTER
729 struct net_device *dev = skb->dev;
730#endif
731
732 if (skb->pkt_type != PACKET_HOST)
733 goto drop;
734
735 /* Ensure that we have enough space for headers */
736 rt = (struct dn_route *)skb->dst;
737 header_len = dn_db->use_long ? 21 : 6;
738 if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len))
739 goto drop;
740
741 /*
742 * Hop count exceeded.
743 */
744 if (++cb->hops > 30)
745 goto drop;
746
747 skb->dev = rt->u.dst.dev;
748
749 /*
750 * If packet goes out same interface it came in on, then set
751 * the Intra-Ethernet bit. This has no effect for short
752 * packets, so we don't need to test for them here.
753 */
754 cb->rt_flags &= ~DN_RT_F_IE;
755 if (rt->rt_flags & RTCF_DOREDIRECT)
756 cb->rt_flags |= DN_RT_F_IE;
757
758 return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output);
759
760drop:
761 kfree_skb(skb);
762 return NET_RX_DROP;
763}
764
765/*
766 * Drop packet. This is used for endnodes and for
767 * when we should not be forwarding packets from
768 * this dest.
769 */
770static int dn_blackhole(struct sk_buff *skb)
771{
772 kfree_skb(skb);
773 return NET_RX_DROP;
774}
775
776/*
777 * Used to catch bugs. This should never normally get
778 * called.
779 */
780static int dn_rt_bug(struct sk_buff *skb)
781{
782 if (net_ratelimit()) {
783 struct dn_skb_cb *cb = DN_SKB_CB(skb);
784
785 printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n",
786 cb->src, cb->dst);
787 }
788
789 kfree_skb(skb);
790
791 return NET_RX_BAD;
792}
793
794static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
795{
796 struct dn_fib_info *fi = res->fi;
797 struct net_device *dev = rt->u.dst.dev;
798 struct neighbour *n;
799 unsigned mss;
800
801 if (fi) {
802 if (DN_FIB_RES_GW(*res) &&
803 DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
804 rt->rt_gateway = DN_FIB_RES_GW(*res);
805 memcpy(rt->u.dst.metrics, fi->fib_metrics,
806 sizeof(rt->u.dst.metrics));
807 }
808 rt->rt_type = res->type;
809
810 if (dev != NULL && rt->u.dst.neighbour == NULL) {
811 n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
812 if (IS_ERR(n))
813 return PTR_ERR(n);
814 rt->u.dst.neighbour = n;
815 }
816
817 if (rt->u.dst.metrics[RTAX_MTU-1] == 0 ||
818 rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu)
819 rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
820 mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst));
821 if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 ||
822 rt->u.dst.metrics[RTAX_ADVMSS-1] > mss)
823 rt->u.dst.metrics[RTAX_ADVMSS-1] = mss;
824 return 0;
825}
826
827static inline int dn_match_addr(__u16 addr1, __u16 addr2)
828{
829 __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2);
830 int match = 16;
831 while(tmp) {
832 tmp >>= 1;
833 match--;
834 }
835 return match;
836}
837
838static __u16 dnet_select_source(const struct net_device *dev, __u16 daddr, int scope)
839{
840 __u16 saddr = 0;
841 struct dn_dev *dn_db = dev->dn_ptr;
842 struct dn_ifaddr *ifa;
843 int best_match = 0;
844 int ret;
845
846 read_lock(&dev_base_lock);
847 for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
848 if (ifa->ifa_scope > scope)
849 continue;
850 if (!daddr) {
851 saddr = ifa->ifa_local;
852 break;
853 }
854 ret = dn_match_addr(daddr, ifa->ifa_local);
855 if (ret > best_match)
856 saddr = ifa->ifa_local;
857 if (best_match == 0)
858 saddr = ifa->ifa_local;
859 }
860 read_unlock(&dev_base_lock);
861
862 return saddr;
863}
864
865static inline __u16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
866{
867 return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
868}
869
870static inline __u16 dn_fib_rules_map_destination(__u16 daddr, struct dn_fib_res *res)
871{
872 __u16 mask = dnet_make_mask(res->prefixlen);
873 return (daddr&~mask)|res->fi->fib_nh->nh_gw;
874}
875
876static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard)
877{
878 struct flowi fl = { .nl_u = { .dn_u =
879 { .daddr = oldflp->fld_dst,
880 .saddr = oldflp->fld_src,
881 .scope = RT_SCOPE_UNIVERSE,
882#ifdef CONFIG_DECNET_ROUTE_FWMARK
883 .fwmark = oldflp->fld_fwmark
884#endif
885 } },
886 .iif = loopback_dev.ifindex,
887 .oif = oldflp->oif };
888 struct dn_route *rt = NULL;
889 struct net_device *dev_out = NULL;
890 struct neighbour *neigh = NULL;
891 unsigned hash;
892 unsigned flags = 0;
893 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
894 int err;
895 int free_res = 0;
896 __u16 gateway = 0;
897
898 if (decnet_debug_level & 16)
899 printk(KERN_DEBUG
900 "dn_route_output_slow: dst=%04x src=%04x mark=%d"
901 " iif=%d oif=%d\n", oldflp->fld_dst, oldflp->fld_src,
902 oldflp->fld_fwmark, loopback_dev.ifindex, oldflp->oif);
903
904 /* If we have an output interface, verify its a DECnet device */
905 if (oldflp->oif) {
906 dev_out = dev_get_by_index(oldflp->oif);
907 err = -ENODEV;
908 if (dev_out && dev_out->dn_ptr == NULL) {
909 dev_put(dev_out);
910 dev_out = NULL;
911 }
912 if (dev_out == NULL)
913 goto out;
914 }
915
916 /* If we have a source address, verify that its a local address */
917 if (oldflp->fld_src) {
918 err = -EADDRNOTAVAIL;
919
920 if (dev_out) {
921 if (dn_dev_islocal(dev_out, oldflp->fld_src))
922 goto source_ok;
923 dev_put(dev_out);
924 goto out;
925 }
926 read_lock(&dev_base_lock);
927 for(dev_out = dev_base; dev_out; dev_out = dev_out->next) {
928 if (!dev_out->dn_ptr)
929 continue;
930 if (dn_dev_islocal(dev_out, oldflp->fld_src))
931 break;
932 }
933 read_unlock(&dev_base_lock);
934 if (dev_out == NULL)
935 goto out;
936 dev_hold(dev_out);
937source_ok:
938 ;
939 }
940
941 /* No destination? Assume its local */
942 if (!fl.fld_dst) {
943 fl.fld_dst = fl.fld_src;
944
945 err = -EADDRNOTAVAIL;
946 if (dev_out)
947 dev_put(dev_out);
948 dev_out = &loopback_dev;
949 dev_hold(dev_out);
950 if (!fl.fld_dst) {
951 fl.fld_dst =
952 fl.fld_src = dnet_select_source(dev_out, 0,
953 RT_SCOPE_HOST);
954 if (!fl.fld_dst)
955 goto out;
956 }
957 fl.oif = loopback_dev.ifindex;
958 res.type = RTN_LOCAL;
959 goto make_route;
960 }
961
962 if (decnet_debug_level & 16)
963 printk(KERN_DEBUG
964 "dn_route_output_slow: initial checks complete."
965 " dst=%o4x src=%04x oif=%d try_hard=%d\n", fl.fld_dst,
966 fl.fld_src, fl.oif, try_hard);
967
968 /*
969 * N.B. If the kernel is compiled without router support then
970 * dn_fib_lookup() will evaluate to non-zero so this if () block
971 * will always be executed.
972 */
973 err = -ESRCH;
974 if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) {
975 struct dn_dev *dn_db;
976 if (err != -ESRCH)
977 goto out;
978 /*
979 * Here the fallback is basically the standard algorithm for
980 * routing in endnodes which is described in the DECnet routing
981 * docs
982 *
983 * If we are not trying hard, look in neighbour cache.
984 * The result is tested to ensure that if a specific output
985 * device/source address was requested, then we honour that
986 * here
987 */
988 if (!try_hard) {
989 neigh = neigh_lookup_nodev(&dn_neigh_table, &fl.fld_dst);
990 if (neigh) {
991 if ((oldflp->oif &&
992 (neigh->dev->ifindex != oldflp->oif)) ||
993 (oldflp->fld_src &&
994 (!dn_dev_islocal(neigh->dev,
995 oldflp->fld_src)))) {
996 neigh_release(neigh);
997 neigh = NULL;
998 } else {
999 if (dev_out)
1000 dev_put(dev_out);
1001 if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
1002 dev_out = &loopback_dev;
1003 res.type = RTN_LOCAL;
1004 } else {
1005 dev_out = neigh->dev;
1006 }
1007 dev_hold(dev_out);
1008 goto select_source;
1009 }
1010 }
1011 }
1012
1013 /* Not there? Perhaps its a local address */
1014 if (dev_out == NULL)
1015 dev_out = dn_dev_get_default();
1016 err = -ENODEV;
1017 if (dev_out == NULL)
1018 goto out;
1019 dn_db = dev_out->dn_ptr;
1020 /* Possible improvement - check all devices for local addr */
1021 if (dn_dev_islocal(dev_out, fl.fld_dst)) {
1022 dev_put(dev_out);
1023 dev_out = &loopback_dev;
1024 dev_hold(dev_out);
1025 res.type = RTN_LOCAL;
1026 goto select_source;
1027 }
1028 /* Not local either.... try sending it to the default router */
1029 neigh = neigh_clone(dn_db->router);
1030 BUG_ON(neigh && neigh->dev != dev_out);
1031
1032 /* Ok then, we assume its directly connected and move on */
1033select_source:
1034 if (neigh)
1035 gateway = ((struct dn_neigh *)neigh)->addr;
1036 if (gateway == 0)
1037 gateway = fl.fld_dst;
1038 if (fl.fld_src == 0) {
1039 fl.fld_src = dnet_select_source(dev_out, gateway,
1040 res.type == RTN_LOCAL ?
1041 RT_SCOPE_HOST :
1042 RT_SCOPE_LINK);
1043 if (fl.fld_src == 0 && res.type != RTN_LOCAL)
1044 goto e_addr;
1045 }
1046 fl.oif = dev_out->ifindex;
1047 goto make_route;
1048 }
1049 free_res = 1;
1050
1051 if (res.type == RTN_NAT)
1052 goto e_inval;
1053
1054 if (res.type == RTN_LOCAL) {
1055 if (!fl.fld_src)
1056 fl.fld_src = fl.fld_dst;
1057 if (dev_out)
1058 dev_put(dev_out);
1059 dev_out = &loopback_dev;
1060 dev_hold(dev_out);
1061 fl.oif = dev_out->ifindex;
1062 if (res.fi)
1063 dn_fib_info_put(res.fi);
1064 res.fi = NULL;
1065 goto make_route;
1066 }
1067
1068 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1069 dn_fib_select_multipath(&fl, &res);
1070
1071 /*
1072 * We could add some logic to deal with default routes here and
1073 * get rid of some of the special casing above.
1074 */
1075
1076 if (!fl.fld_src)
1077 fl.fld_src = DN_FIB_RES_PREFSRC(res);
1078
1079 if (dev_out)
1080 dev_put(dev_out);
1081 dev_out = DN_FIB_RES_DEV(res);
1082 dev_hold(dev_out);
1083 fl.oif = dev_out->ifindex;
1084 gateway = DN_FIB_RES_GW(res);
1085
1086make_route:
1087 if (dev_out->flags & IFF_LOOPBACK)
1088 flags |= RTCF_LOCAL;
1089
1090 rt = dst_alloc(&dn_dst_ops);
1091 if (rt == NULL)
1092 goto e_nobufs;
1093
1094 atomic_set(&rt->u.dst.__refcnt, 1);
1095 rt->u.dst.flags = DST_HOST;
1096
1097 rt->fl.fld_src = oldflp->fld_src;
1098 rt->fl.fld_dst = oldflp->fld_dst;
1099 rt->fl.oif = oldflp->oif;
1100 rt->fl.iif = 0;
1101#ifdef CONFIG_DECNET_ROUTE_FWMARK
1102 rt->fl.fld_fwmark = oldflp->fld_fwmark;
1103#endif
1104
1105 rt->rt_saddr = fl.fld_src;
1106 rt->rt_daddr = fl.fld_dst;
1107 rt->rt_gateway = gateway ? gateway : fl.fld_dst;
1108 rt->rt_local_src = fl.fld_src;
1109
1110 rt->rt_dst_map = fl.fld_dst;
1111 rt->rt_src_map = fl.fld_src;
1112
1113 rt->u.dst.dev = dev_out;
1114 dev_hold(dev_out);
1115 rt->u.dst.neighbour = neigh;
1116 neigh = NULL;
1117
1118 rt->u.dst.lastuse = jiffies;
1119 rt->u.dst.output = dn_output;
1120 rt->u.dst.input = dn_rt_bug;
1121 rt->rt_flags = flags;
1122 if (flags & RTCF_LOCAL)
1123 rt->u.dst.input = dn_nsp_rx;
1124
1125 err = dn_rt_set_next_hop(rt, &res);
1126 if (err)
1127 goto e_neighbour;
1128
1129 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1130 dn_insert_route(rt, hash, (struct dn_route **)pprt);
1131
1132done:
1133 if (neigh)
1134 neigh_release(neigh);
1135 if (free_res)
1136 dn_fib_res_put(&res);
1137 if (dev_out)
1138 dev_put(dev_out);
1139out:
1140 return err;
1141
1142e_addr:
1143 err = -EADDRNOTAVAIL;
1144 goto done;
1145e_inval:
1146 err = -EINVAL;
1147 goto done;
1148e_nobufs:
1149 err = -ENOBUFS;
1150 goto done;
1151e_neighbour:
1152 dst_free(&rt->u.dst);
1153 goto e_nobufs;
1154}
1155
1156
1157/*
1158 * N.B. The flags may be moved into the flowi at some future stage.
1159 */
1160static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags)
1161{
1162 unsigned hash = dn_hash(flp->fld_src, flp->fld_dst);
1163 struct dn_route *rt = NULL;
1164
1165 if (!(flags & MSG_TRYHARD)) {
1166 rcu_read_lock_bh();
1167 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt;
1168 rt = rcu_dereference(rt->u.rt_next)) {
1169 if ((flp->fld_dst == rt->fl.fld_dst) &&
1170 (flp->fld_src == rt->fl.fld_src) &&
1171#ifdef CONFIG_DECNET_ROUTE_FWMARK
1172 (flp->fld_fwmark == rt->fl.fld_fwmark) &&
1173#endif
1174 (rt->fl.iif == 0) &&
1175 (rt->fl.oif == flp->oif)) {
1176 rt->u.dst.lastuse = jiffies;
1177 dst_hold(&rt->u.dst);
1178 rt->u.dst.__use++;
1179 rcu_read_unlock_bh();
1180 *pprt = &rt->u.dst;
1181 return 0;
1182 }
1183 }
1184 rcu_read_unlock_bh();
1185 }
1186
1187 return dn_route_output_slow(pprt, flp, flags);
1188}
1189
1190static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags)
1191{
1192 int err;
1193
1194 err = __dn_route_output_key(pprt, flp, flags);
1195 if (err == 0 && flp->proto) {
1196 err = xfrm_lookup(pprt, flp, NULL, 0);
1197 }
1198 return err;
1199}
1200
1201int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags)
1202{
1203 int err;
1204
1205 err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
1206 if (err == 0 && fl->proto) {
1207 err = xfrm_lookup(pprt, fl, sk, !(flags & MSG_DONTWAIT));
1208 }
1209 return err;
1210}
1211
1212static int dn_route_input_slow(struct sk_buff *skb)
1213{
1214 struct dn_route *rt = NULL;
1215 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1216 struct net_device *in_dev = skb->dev;
1217 struct net_device *out_dev = NULL;
1218 struct dn_dev *dn_db;
1219 struct neighbour *neigh = NULL;
1220 unsigned hash;
1221 int flags = 0;
1222 __u16 gateway = 0;
1223 __u16 local_src = 0;
1224 struct flowi fl = { .nl_u = { .dn_u =
1225 { .daddr = cb->dst,
1226 .saddr = cb->src,
1227 .scope = RT_SCOPE_UNIVERSE,
1228#ifdef CONFIG_DECNET_ROUTE_FWMARK
1229 .fwmark = skb->nfmark
1230#endif
1231 } },
1232 .iif = skb->dev->ifindex };
1233 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
1234 int err = -EINVAL;
1235 int free_res = 0;
1236
1237 dev_hold(in_dev);
1238
1239 if ((dn_db = in_dev->dn_ptr) == NULL)
1240 goto out;
1241
1242 /* Zero source addresses are not allowed */
1243 if (fl.fld_src == 0)
1244 goto out;
1245
1246 /*
1247 * In this case we've just received a packet from a source
1248 * outside ourselves pretending to come from us. We don't
1249 * allow it any further to prevent routing loops, spoofing and
1250 * other nasties. Loopback packets already have the dst attached
1251 * so this only affects packets which have originated elsewhere.
1252 */
1253 err = -ENOTUNIQ;
1254 if (dn_dev_islocal(in_dev, cb->src))
1255 goto out;
1256
1257 err = dn_fib_lookup(&fl, &res);
1258 if (err) {
1259 if (err != -ESRCH)
1260 goto out;
1261 /*
1262 * Is the destination us ?
1263 */
1264 if (!dn_dev_islocal(in_dev, cb->dst))
1265 goto e_inval;
1266
1267 res.type = RTN_LOCAL;
1268 flags |= RTCF_DIRECTSRC;
1269 } else {
1270 __u16 src_map = fl.fld_src;
1271 free_res = 1;
1272
1273 out_dev = DN_FIB_RES_DEV(res);
1274 if (out_dev == NULL) {
1275 if (net_ratelimit())
1276 printk(KERN_CRIT "Bug in dn_route_input_slow() "
1277 "No output device\n");
1278 goto e_inval;
1279 }
1280 dev_hold(out_dev);
1281
1282 if (res.r)
1283 src_map = dn_fib_rules_policy(fl.fld_src, &res, &flags);
1284
1285 gateway = DN_FIB_RES_GW(res);
1286 if (res.type == RTN_NAT) {
1287 fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res);
1288 dn_fib_res_put(&res);
1289 free_res = 0;
1290 if (dn_fib_lookup(&fl, &res))
1291 goto e_inval;
1292 free_res = 1;
1293 if (res.type != RTN_UNICAST)
1294 goto e_inval;
1295 flags |= RTCF_DNAT;
1296 gateway = fl.fld_dst;
1297 }
1298 fl.fld_src = src_map;
1299 }
1300
1301 switch(res.type) {
1302 case RTN_UNICAST:
1303 /*
1304 * Forwarding check here, we only check for forwarding
1305 * being turned off, if you want to only forward intra
1306 * area, its up to you to set the routing tables up
1307 * correctly.
1308 */
1309 if (dn_db->parms.forwarding == 0)
1310 goto e_inval;
1311
1312 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1313 dn_fib_select_multipath(&fl, &res);
1314
1315 /*
1316 * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
1317 * flag as a hint to set the intra-ethernet bit when
1318 * forwarding. If we've got NAT in operation, we don't do
1319 * this optimisation.
1320 */
1321 if (out_dev == in_dev && !(flags & RTCF_NAT))
1322 flags |= RTCF_DOREDIRECT;
1323
1324 local_src = DN_FIB_RES_PREFSRC(res);
1325
1326 case RTN_BLACKHOLE:
1327 case RTN_UNREACHABLE:
1328 break;
1329 case RTN_LOCAL:
1330 flags |= RTCF_LOCAL;
1331 fl.fld_src = cb->dst;
1332 fl.fld_dst = cb->src;
1333
1334 /* Routing tables gave us a gateway */
1335 if (gateway)
1336 goto make_route;
1337
1338 /* Packet was intra-ethernet, so we know its on-link */
1339 if (cb->rt_flags | DN_RT_F_IE) {
1340 gateway = cb->src;
1341 flags |= RTCF_DIRECTSRC;
1342 goto make_route;
1343 }
1344
1345 /* Use the default router if there is one */
1346 neigh = neigh_clone(dn_db->router);
1347 if (neigh) {
1348 gateway = ((struct dn_neigh *)neigh)->addr;
1349 goto make_route;
1350 }
1351
1352 /* Close eyes and pray */
1353 gateway = cb->src;
1354 flags |= RTCF_DIRECTSRC;
1355 goto make_route;
1356 default:
1357 goto e_inval;
1358 }
1359
1360make_route:
1361 rt = dst_alloc(&dn_dst_ops);
1362 if (rt == NULL)
1363 goto e_nobufs;
1364
1365 rt->rt_saddr = fl.fld_src;
1366 rt->rt_daddr = fl.fld_dst;
1367 rt->rt_gateway = fl.fld_dst;
1368 if (gateway)
1369 rt->rt_gateway = gateway;
1370 rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
1371
1372 rt->rt_dst_map = fl.fld_dst;
1373 rt->rt_src_map = fl.fld_src;
1374
1375 rt->fl.fld_src = cb->src;
1376 rt->fl.fld_dst = cb->dst;
1377 rt->fl.oif = 0;
1378 rt->fl.iif = in_dev->ifindex;
1379 rt->fl.fld_fwmark = fl.fld_fwmark;
1380
1381 rt->u.dst.flags = DST_HOST;
1382 rt->u.dst.neighbour = neigh;
1383 rt->u.dst.dev = out_dev;
1384 rt->u.dst.lastuse = jiffies;
1385 rt->u.dst.output = dn_rt_bug;
1386 switch(res.type) {
1387 case RTN_UNICAST:
1388 rt->u.dst.input = dn_forward;
1389 break;
1390 case RTN_LOCAL:
1391 rt->u.dst.output = dn_output;
1392 rt->u.dst.input = dn_nsp_rx;
1393 rt->u.dst.dev = in_dev;
1394 flags |= RTCF_LOCAL;
1395 break;
1396 default:
1397 case RTN_UNREACHABLE:
1398 case RTN_BLACKHOLE:
1399 rt->u.dst.input = dn_blackhole;
1400 }
1401 rt->rt_flags = flags;
1402 if (rt->u.dst.dev)
1403 dev_hold(rt->u.dst.dev);
1404
1405 err = dn_rt_set_next_hop(rt, &res);
1406 if (err)
1407 goto e_neighbour;
1408
1409 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1410 dn_insert_route(rt, hash, (struct dn_route **)&skb->dst);
1411
1412done:
1413 if (neigh)
1414 neigh_release(neigh);
1415 if (free_res)
1416 dn_fib_res_put(&res);
1417 dev_put(in_dev);
1418 if (out_dev)
1419 dev_put(out_dev);
1420out:
1421 return err;
1422
1423e_inval:
1424 err = -EINVAL;
1425 goto done;
1426
1427e_nobufs:
1428 err = -ENOBUFS;
1429 goto done;
1430
1431e_neighbour:
1432 dst_free(&rt->u.dst);
1433 goto done;
1434}
1435
1436int dn_route_input(struct sk_buff *skb)
1437{
1438 struct dn_route *rt;
1439 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1440 unsigned hash = dn_hash(cb->src, cb->dst);
1441
1442 if (skb->dst)
1443 return 0;
1444
1445 rcu_read_lock();
1446 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
1447 rt = rcu_dereference(rt->u.rt_next)) {
1448 if ((rt->fl.fld_src == cb->src) &&
1449 (rt->fl.fld_dst == cb->dst) &&
1450 (rt->fl.oif == 0) &&
1451#ifdef CONFIG_DECNET_ROUTE_FWMARK
1452 (rt->fl.fld_fwmark == skb->nfmark) &&
1453#endif
1454 (rt->fl.iif == cb->iif)) {
1455 rt->u.dst.lastuse = jiffies;
1456 dst_hold(&rt->u.dst);
1457 rt->u.dst.__use++;
1458 rcu_read_unlock();
1459 skb->dst = (struct dst_entry *)rt;
1460 return 0;
1461 }
1462 }
1463 rcu_read_unlock();
1464
1465 return dn_route_input_slow(skb);
1466}
1467
1468static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, int nowait)
1469{
1470 struct dn_route *rt = (struct dn_route *)skb->dst;
1471 struct rtmsg *r;
1472 struct nlmsghdr *nlh;
1473 unsigned char *b = skb->tail;
1474 struct rta_cacheinfo ci;
1475
1476 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*r));
1477 r = NLMSG_DATA(nlh);
1478 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1479 r->rtm_family = AF_DECnet;
1480 r->rtm_dst_len = 16;
1481 r->rtm_src_len = 0;
1482 r->rtm_tos = 0;
1483 r->rtm_table = RT_TABLE_MAIN;
1484 r->rtm_type = rt->rt_type;
1485 r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
1486 r->rtm_scope = RT_SCOPE_UNIVERSE;
1487 r->rtm_protocol = RTPROT_UNSPEC;
1488 if (rt->rt_flags & RTCF_NOTIFY)
1489 r->rtm_flags |= RTM_F_NOTIFY;
1490 RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr);
1491 if (rt->fl.fld_src) {
1492 r->rtm_src_len = 16;
1493 RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src);
1494 }
1495 if (rt->u.dst.dev)
1496 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex);
1497 /*
1498 * Note to self - change this if input routes reverse direction when
1499 * they deal only with inputs and not with replies like they do
1500 * currently.
1501 */
1502 RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src);
1503 if (rt->rt_daddr != rt->rt_gateway)
1504 RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway);
1505 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
1506 goto rtattr_failure;
1507 ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
1508 ci.rta_used = rt->u.dst.__use;
1509 ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
1510 if (rt->u.dst.expires)
1511 ci.rta_expires = jiffies_to_clock_t(rt->u.dst.expires - jiffies);
1512 else
1513 ci.rta_expires = 0;
1514 ci.rta_error = rt->u.dst.error;
1515 ci.rta_id = ci.rta_ts = ci.rta_tsage = 0;
1516 RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);
1517 if (rt->fl.iif)
1518 RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif);
1519
1520 nlh->nlmsg_len = skb->tail - b;
1521 return skb->len;
1522
1523nlmsg_failure:
1524rtattr_failure:
1525 skb_trim(skb, b - skb->data);
1526 return -1;
1527}
1528
1529/*
1530 * This is called by both endnodes and routers now.
1531 */
1532int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
1533{
1534 struct rtattr **rta = arg;
1535 struct rtmsg *rtm = NLMSG_DATA(nlh);
1536 struct dn_route *rt = NULL;
1537 struct dn_skb_cb *cb;
1538 int err;
1539 struct sk_buff *skb;
1540 struct flowi fl;
1541
1542 memset(&fl, 0, sizeof(fl));
1543 fl.proto = DNPROTO_NSP;
1544
1545 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1546 if (skb == NULL)
1547 return -ENOBUFS;
1548 skb->mac.raw = skb->data;
1549 cb = DN_SKB_CB(skb);
1550
1551 if (rta[RTA_SRC-1])
1552 memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2);
1553 if (rta[RTA_DST-1])
1554 memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2);
1555 if (rta[RTA_IIF-1])
1556 memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
1557
1558 if (fl.iif) {
1559 struct net_device *dev;
1560 if ((dev = dev_get_by_index(fl.iif)) == NULL) {
1561 kfree_skb(skb);
1562 return -ENODEV;
1563 }
1564 if (!dev->dn_ptr) {
1565 dev_put(dev);
1566 kfree_skb(skb);
1567 return -ENODEV;
1568 }
1569 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1570 skb->dev = dev;
1571 cb->src = fl.fld_src;
1572 cb->dst = fl.fld_dst;
1573 local_bh_disable();
1574 err = dn_route_input(skb);
1575 local_bh_enable();
1576 memset(cb, 0, sizeof(struct dn_skb_cb));
1577 rt = (struct dn_route *)skb->dst;
1578 if (!err && -rt->u.dst.error)
1579 err = rt->u.dst.error;
1580 } else {
1581 int oif = 0;
1582 if (rta[RTA_OIF - 1])
1583 memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
1584 fl.oif = oif;
1585 err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0);
1586 }
1587
1588 if (skb->dev)
1589 dev_put(skb->dev);
1590 skb->dev = NULL;
1591 if (err)
1592 goto out_free;
1593 skb->dst = &rt->u.dst;
1594 if (rtm->rtm_flags & RTM_F_NOTIFY)
1595 rt->rt_flags |= RTCF_NOTIFY;
1596
1597 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
1598
1599 err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0);
1600
1601 if (err == 0)
1602 goto out_free;
1603 if (err < 0) {
1604 err = -EMSGSIZE;
1605 goto out_free;
1606 }
1607
1608 err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
1609
1610 return err;
1611
1612out_free:
1613 kfree_skb(skb);
1614 return err;
1615}
1616
1617/*
1618 * For routers, this is called from dn_fib_dump, but for endnodes its
1619 * called directly from the rtnetlink dispatch table.
1620 */
1621int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
1622{
1623 struct dn_route *rt;
1624 int h, s_h;
1625 int idx, s_idx;
1626
1627 if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg))
1628 return -EINVAL;
1629 if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED))
1630 return 0;
1631
1632 s_h = cb->args[0];
1633 s_idx = idx = cb->args[1];
1634 for(h = 0; h <= dn_rt_hash_mask; h++) {
1635 if (h < s_h)
1636 continue;
1637 if (h > s_h)
1638 s_idx = 0;
1639 rcu_read_lock_bh();
1640 for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0;
1641 rt;
1642 rt = rcu_dereference(rt->u.rt_next), idx++) {
1643 if (idx < s_idx)
1644 continue;
1645 skb->dst = dst_clone(&rt->u.dst);
1646 if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
1647 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 1) <= 0) {
1648 dst_release(xchg(&skb->dst, NULL));
1649 rcu_read_unlock_bh();
1650 goto done;
1651 }
1652 dst_release(xchg(&skb->dst, NULL));
1653 }
1654 rcu_read_unlock_bh();
1655 }
1656
1657done:
1658 cb->args[0] = h;
1659 cb->args[1] = idx;
1660 return skb->len;
1661}
1662
1663#ifdef CONFIG_PROC_FS
1664struct dn_rt_cache_iter_state {
1665 int bucket;
1666};
1667
1668static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
1669{
1670 struct dn_route *rt = NULL;
1671 struct dn_rt_cache_iter_state *s = seq->private;
1672
1673 for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
1674 rcu_read_lock_bh();
1675 rt = dn_rt_hash_table[s->bucket].chain;
1676 if (rt)
1677 break;
1678 rcu_read_unlock_bh();
1679 }
1680 return rt;
1681}
1682
1683static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
1684{
1685 struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private);
1686
1687 rt = rt->u.rt_next;
1688 while(!rt) {
1689 rcu_read_unlock_bh();
1690 if (--s->bucket < 0)
1691 break;
1692 rcu_read_lock_bh();
1693 rt = dn_rt_hash_table[s->bucket].chain;
1694 }
1695 return rt;
1696}
1697
1698static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
1699{
1700 struct dn_route *rt = dn_rt_cache_get_first(seq);
1701
1702 if (rt) {
1703 while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
1704 --*pos;
1705 }
1706 return *pos ? NULL : rt;
1707}
1708
1709static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1710{
1711 struct dn_route *rt = dn_rt_cache_get_next(seq, v);
1712 ++*pos;
1713 return rt;
1714}
1715
1716static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
1717{
1718 if (v)
1719 rcu_read_unlock_bh();
1720}
1721
1722static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
1723{
1724 struct dn_route *rt = v;
1725 char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
1726
1727 seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
1728 rt->u.dst.dev ? rt->u.dst.dev->name : "*",
1729 dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1),
1730 dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2),
1731 atomic_read(&rt->u.dst.__refcnt),
1732 rt->u.dst.__use,
1733 (int) dst_metric(&rt->u.dst, RTAX_RTT));
1734 return 0;
1735}
1736
1737static struct seq_operations dn_rt_cache_seq_ops = {
1738 .start = dn_rt_cache_seq_start,
1739 .next = dn_rt_cache_seq_next,
1740 .stop = dn_rt_cache_seq_stop,
1741 .show = dn_rt_cache_seq_show,
1742};
1743
1744static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
1745{
1746 struct seq_file *seq;
1747 int rc = -ENOMEM;
1748 struct dn_rt_cache_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
1749
1750 if (!s)
1751 goto out;
1752 rc = seq_open(file, &dn_rt_cache_seq_ops);
1753 if (rc)
1754 goto out_kfree;
1755 seq = file->private_data;
1756 seq->private = s;
1757 memset(s, 0, sizeof(*s));
1758out:
1759 return rc;
1760out_kfree:
1761 kfree(s);
1762 goto out;
1763}
1764
1765static struct file_operations dn_rt_cache_seq_fops = {
1766 .owner = THIS_MODULE,
1767 .open = dn_rt_cache_seq_open,
1768 .read = seq_read,
1769 .llseek = seq_lseek,
1770 .release = seq_release_private,
1771};
1772
1773#endif /* CONFIG_PROC_FS */
1774
1775void __init dn_route_init(void)
1776{
1777 int i, goal, order;
1778
1779 dn_dst_ops.kmem_cachep = kmem_cache_create("dn_dst_cache",
1780 sizeof(struct dn_route),
1781 0, SLAB_HWCACHE_ALIGN,
1782 NULL, NULL);
1783
1784 if (!dn_dst_ops.kmem_cachep)
1785 panic("DECnet: Failed to allocate dn_dst_cache\n");
1786
1787 init_timer(&dn_route_timer);
1788 dn_route_timer.function = dn_dst_check_expire;
1789 dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
1790 add_timer(&dn_route_timer);
1791
1792 goal = num_physpages >> (26 - PAGE_SHIFT);
1793
1794 for(order = 0; (1UL << order) < goal; order++)
1795 /* NOTHING */;
1796
1797 /*
1798 * Only want 1024 entries max, since the table is very, very unlikely
1799 * to be larger than that.
1800 */
1801 while(order && ((((1UL << order) * PAGE_SIZE) /
1802 sizeof(struct dn_rt_hash_bucket)) >= 2048))
1803 order--;
1804
1805 do {
1806 dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
1807 sizeof(struct dn_rt_hash_bucket);
1808 while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
1809 dn_rt_hash_mask--;
1810 dn_rt_hash_table = (struct dn_rt_hash_bucket *)
1811 __get_free_pages(GFP_ATOMIC, order);
1812 } while (dn_rt_hash_table == NULL && --order > 0);
1813
1814 if (!dn_rt_hash_table)
1815 panic("Failed to allocate DECnet route cache hash table\n");
1816
1817 printk(KERN_INFO
1818 "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
1819 dn_rt_hash_mask,
1820 (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
1821
1822 dn_rt_hash_mask--;
1823 for(i = 0; i <= dn_rt_hash_mask; i++) {
1824 spin_lock_init(&dn_rt_hash_table[i].lock);
1825 dn_rt_hash_table[i].chain = NULL;
1826 }
1827
1828 dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
1829
1830 proc_net_fops_create("decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops);
1831}
1832
1833void __exit dn_route_cleanup(void)
1834{
1835 del_timer(&dn_route_timer);
1836 dn_run_flush(0);
1837
1838 proc_net_remove("decnet_cache");
1839}
1840
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
new file mode 100644
index 000000000000..597587d170d8
--- /dev/null
+++ b/net/decnet/dn_rules.c
@@ -0,0 +1,416 @@
1
2/*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet Routing Forwarding Information Base (Rules)
8 *
9 * Author: Steve Whitehouse <SteveW@ACM.org>
10 * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
11 *
12 *
13 * Changes:
14 *
15 */
16#include <linux/config.h>
17#include <linux/string.h>
18#include <linux/net.h>
19#include <linux/socket.h>
20#include <linux/sockios.h>
21#include <linux/init.h>
22#include <linux/skbuff.h>
23#include <linux/netlink.h>
24#include <linux/rtnetlink.h>
25#include <linux/proc_fs.h>
26#include <linux/netdevice.h>
27#include <linux/timer.h>
28#include <linux/spinlock.h>
29#include <linux/in_route.h>
30#include <asm/atomic.h>
31#include <asm/uaccess.h>
32#include <net/neighbour.h>
33#include <net/dst.h>
34#include <net/flow.h>
35#include <net/dn.h>
36#include <net/dn_fib.h>
37#include <net/dn_neigh.h>
38#include <net/dn_dev.h>
39
40struct dn_fib_rule
41{
42 struct dn_fib_rule *r_next;
43 atomic_t r_clntref;
44 u32 r_preference;
45 unsigned char r_table;
46 unsigned char r_action;
47 unsigned char r_dst_len;
48 unsigned char r_src_len;
49 dn_address r_src;
50 dn_address r_srcmask;
51 dn_address r_dst;
52 dn_address r_dstmask;
53 dn_address r_srcmap;
54 u8 r_flags;
55#ifdef CONFIG_DECNET_ROUTE_FWMARK
56 u32 r_fwmark;
57#endif
58 int r_ifindex;
59 char r_ifname[IFNAMSIZ];
60 int r_dead;
61};
62
63static struct dn_fib_rule default_rule = {
64 .r_clntref = ATOMIC_INIT(2),
65 .r_preference = 0x7fff,
66 .r_table = RT_TABLE_MAIN,
67 .r_action = RTN_UNICAST
68};
69
70static struct dn_fib_rule *dn_fib_rules = &default_rule;
71static DEFINE_RWLOCK(dn_fib_rules_lock);
72
73
74int dn_fib_rtm_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
75{
76 struct rtattr **rta = arg;
77 struct rtmsg *rtm = NLMSG_DATA(nlh);
78 struct dn_fib_rule *r, **rp;
79 int err = -ESRCH;
80
81 for(rp=&dn_fib_rules; (r=*rp) != NULL; rp = &r->r_next) {
82 if ((!rta[RTA_SRC-1] || memcmp(RTA_DATA(rta[RTA_SRC-1]), &r->r_src, 2) == 0) &&
83 rtm->rtm_src_len == r->r_src_len &&
84 rtm->rtm_dst_len == r->r_dst_len &&
85 (!rta[RTA_DST-1] || memcmp(RTA_DATA(rta[RTA_DST-1]), &r->r_dst, 2) == 0) &&
86#ifdef CONFIG_DECNET_ROUTE_FWMARK
87 (!rta[RTA_PROTOINFO-1] || memcmp(RTA_DATA(rta[RTA_PROTOINFO-1]), &r->r_fwmark, 4) == 0) &&
88#endif
89 (!rtm->rtm_type || rtm->rtm_type == r->r_action) &&
90 (!rta[RTA_PRIORITY-1] || memcmp(RTA_DATA(rta[RTA_PRIORITY-1]), &r->r_preference, 4) == 0) &&
91 (!rta[RTA_IIF-1] || rtattr_strcmp(rta[RTA_IIF-1], r->r_ifname) == 0) &&
92 (!rtm->rtm_table || (r && rtm->rtm_table == r->r_table))) {
93
94 err = -EPERM;
95 if (r == &default_rule)
96 break;
97
98 write_lock_bh(&dn_fib_rules_lock);
99 *rp = r->r_next;
100 r->r_dead = 1;
101 write_unlock_bh(&dn_fib_rules_lock);
102 dn_fib_rule_put(r);
103 err = 0;
104 break;
105 }
106 }
107
108 return err;
109}
110
111void dn_fib_rule_put(struct dn_fib_rule *r)
112{
113 if (atomic_dec_and_test(&r->r_clntref)) {
114 if (r->r_dead)
115 kfree(r);
116 else
117 printk(KERN_DEBUG "Attempt to free alive dn_fib_rule\n");
118 }
119}
120
121
122int dn_fib_rtm_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
123{
124 struct rtattr **rta = arg;
125 struct rtmsg *rtm = NLMSG_DATA(nlh);
126 struct dn_fib_rule *r, *new_r, **rp;
127 unsigned char table_id;
128
129 if (rtm->rtm_src_len > 16 || rtm->rtm_dst_len > 16)
130 return -EINVAL;
131
132 if (rta[RTA_IIF-1] && RTA_PAYLOAD(rta[RTA_IIF-1]) > IFNAMSIZ)
133 return -EINVAL;
134
135 if (rtm->rtm_type == RTN_NAT)
136 return -EINVAL;
137
138 table_id = rtm->rtm_table;
139 if (table_id == RT_TABLE_UNSPEC) {
140 struct dn_fib_table *tb;
141 if (rtm->rtm_type == RTN_UNICAST) {
142 if ((tb = dn_fib_empty_table()) == NULL)
143 return -ENOBUFS;
144 table_id = tb->n;
145 }
146 }
147
148 new_r = kmalloc(sizeof(*new_r), GFP_KERNEL);
149 if (!new_r)
150 return -ENOMEM;
151 memset(new_r, 0, sizeof(*new_r));
152 if (rta[RTA_SRC-1])
153 memcpy(&new_r->r_src, RTA_DATA(rta[RTA_SRC-1]), 2);
154 if (rta[RTA_DST-1])
155 memcpy(&new_r->r_dst, RTA_DATA(rta[RTA_DST-1]), 2);
156 if (rta[RTA_GATEWAY-1])
157 memcpy(&new_r->r_srcmap, RTA_DATA(rta[RTA_GATEWAY-1]), 2);
158 new_r->r_src_len = rtm->rtm_src_len;
159 new_r->r_dst_len = rtm->rtm_dst_len;
160 new_r->r_srcmask = dnet_make_mask(rtm->rtm_src_len);
161 new_r->r_dstmask = dnet_make_mask(rtm->rtm_dst_len);
162#ifdef CONFIG_DECNET_ROUTE_FWMARK
163 if (rta[RTA_PROTOINFO-1])
164 memcpy(&new_r->r_fwmark, RTA_DATA(rta[RTA_PROTOINFO-1]), 4);
165#endif
166 new_r->r_action = rtm->rtm_type;
167 new_r->r_flags = rtm->rtm_flags;
168 if (rta[RTA_PRIORITY-1])
169 memcpy(&new_r->r_preference, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
170 new_r->r_table = table_id;
171 if (rta[RTA_IIF-1]) {
172 struct net_device *dev;
173 rtattr_strlcpy(new_r->r_ifname, rta[RTA_IIF-1], IFNAMSIZ);
174 new_r->r_ifindex = -1;
175 dev = dev_get_by_name(new_r->r_ifname);
176 if (dev) {
177 new_r->r_ifindex = dev->ifindex;
178 dev_put(dev);
179 }
180 }
181
182 rp = &dn_fib_rules;
183 if (!new_r->r_preference) {
184 r = dn_fib_rules;
185 if (r && (r = r->r_next) != NULL) {
186 rp = &dn_fib_rules->r_next;
187 if (r->r_preference)
188 new_r->r_preference = r->r_preference - 1;
189 }
190 }
191
192 while((r=*rp) != NULL) {
193 if (r->r_preference > new_r->r_preference)
194 break;
195 rp = &r->r_next;
196 }
197
198 new_r->r_next = r;
199 atomic_inc(&new_r->r_clntref);
200 write_lock_bh(&dn_fib_rules_lock);
201 *rp = new_r;
202 write_unlock_bh(&dn_fib_rules_lock);
203 return 0;
204}
205
206
207int dn_fib_lookup(const struct flowi *flp, struct dn_fib_res *res)
208{
209 struct dn_fib_rule *r, *policy;
210 struct dn_fib_table *tb;
211 dn_address saddr = flp->fld_src;
212 dn_address daddr = flp->fld_dst;
213 int err;
214
215 read_lock(&dn_fib_rules_lock);
216 for(r = dn_fib_rules; r; r = r->r_next) {
217 if (((saddr^r->r_src) & r->r_srcmask) ||
218 ((daddr^r->r_dst) & r->r_dstmask) ||
219#ifdef CONFIG_DECNET_ROUTE_FWMARK
220 (r->r_fwmark && r->r_fwmark != flp->fld_fwmark) ||
221#endif
222 (r->r_ifindex && r->r_ifindex != flp->iif))
223 continue;
224
225 switch(r->r_action) {
226 case RTN_UNICAST:
227 case RTN_NAT:
228 policy = r;
229 break;
230 case RTN_UNREACHABLE:
231 read_unlock(&dn_fib_rules_lock);
232 return -ENETUNREACH;
233 default:
234 case RTN_BLACKHOLE:
235 read_unlock(&dn_fib_rules_lock);
236 return -EINVAL;
237 case RTN_PROHIBIT:
238 read_unlock(&dn_fib_rules_lock);
239 return -EACCES;
240 }
241
242 if ((tb = dn_fib_get_table(r->r_table, 0)) == NULL)
243 continue;
244 err = tb->lookup(tb, flp, res);
245 if (err == 0) {
246 res->r = policy;
247 if (policy)
248 atomic_inc(&policy->r_clntref);
249 read_unlock(&dn_fib_rules_lock);
250 return 0;
251 }
252 if (err < 0 && err != -EAGAIN) {
253 read_unlock(&dn_fib_rules_lock);
254 return err;
255 }
256 }
257
258 read_unlock(&dn_fib_rules_lock);
259 return -ESRCH;
260}
261
262unsigned dnet_addr_type(__u16 addr)
263{
264 struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
265 struct dn_fib_res res;
266 unsigned ret = RTN_UNICAST;
267 struct dn_fib_table *tb = dn_fib_tables[RT_TABLE_LOCAL];
268
269 res.r = NULL;
270
271 if (tb) {
272 if (!tb->lookup(tb, &fl, &res)) {
273 ret = res.type;
274 dn_fib_res_put(&res);
275 }
276 }
277 return ret;
278}
279
280__u16 dn_fib_rules_policy(__u16 saddr, struct dn_fib_res *res, unsigned *flags)
281{
282 struct dn_fib_rule *r = res->r;
283
284 if (r->r_action == RTN_NAT) {
285 int addrtype = dnet_addr_type(r->r_srcmap);
286
287 if (addrtype == RTN_NAT) {
288 saddr = (saddr&~r->r_srcmask)|r->r_srcmap;
289 *flags |= RTCF_SNAT;
290 } else if (addrtype == RTN_LOCAL || r->r_srcmap == 0) {
291 saddr = r->r_srcmap;
292 *flags |= RTCF_MASQ;
293 }
294 }
295 return saddr;
296}
297
298static void dn_fib_rules_detach(struct net_device *dev)
299{
300 struct dn_fib_rule *r;
301
302 for(r = dn_fib_rules; r; r = r->r_next) {
303 if (r->r_ifindex == dev->ifindex) {
304 write_lock_bh(&dn_fib_rules_lock);
305 r->r_ifindex = -1;
306 write_unlock_bh(&dn_fib_rules_lock);
307 }
308 }
309}
310
311static void dn_fib_rules_attach(struct net_device *dev)
312{
313 struct dn_fib_rule *r;
314
315 for(r = dn_fib_rules; r; r = r->r_next) {
316 if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0) {
317 write_lock_bh(&dn_fib_rules_lock);
318 r->r_ifindex = dev->ifindex;
319 write_unlock_bh(&dn_fib_rules_lock);
320 }
321 }
322}
323
324static int dn_fib_rules_event(struct notifier_block *this, unsigned long event, void *ptr)
325{
326 struct net_device *dev = ptr;
327
328 switch(event) {
329 case NETDEV_UNREGISTER:
330 dn_fib_rules_detach(dev);
331 dn_fib_sync_down(0, dev, 1);
332 case NETDEV_REGISTER:
333 dn_fib_rules_attach(dev);
334 dn_fib_sync_up(dev);
335 }
336
337 return NOTIFY_DONE;
338}
339
340
341static struct notifier_block dn_fib_rules_notifier = {
342 .notifier_call = dn_fib_rules_event,
343};
344
345static int dn_fib_fill_rule(struct sk_buff *skb, struct dn_fib_rule *r, struct netlink_callback *cb)
346{
347 struct rtmsg *rtm;
348 struct nlmsghdr *nlh;
349 unsigned char *b = skb->tail;
350
351
352 nlh = NLMSG_PUT(skb, NETLINK_CREDS(cb->skb)->pid, cb->nlh->nlmsg_seq, RTM_NEWRULE, sizeof(*rtm));
353 rtm = NLMSG_DATA(nlh);
354 rtm->rtm_family = AF_DECnet;
355 rtm->rtm_dst_len = r->r_dst_len;
356 rtm->rtm_src_len = r->r_src_len;
357 rtm->rtm_tos = 0;
358#ifdef CONFIG_DECNET_ROUTE_FWMARK
359 if (r->r_fwmark)
360 RTA_PUT(skb, RTA_PROTOINFO, 4, &r->r_fwmark);
361#endif
362 rtm->rtm_table = r->r_table;
363 rtm->rtm_protocol = 0;
364 rtm->rtm_scope = 0;
365 rtm->rtm_type = r->r_action;
366 rtm->rtm_flags = r->r_flags;
367
368 if (r->r_dst_len)
369 RTA_PUT(skb, RTA_DST, 2, &r->r_dst);
370 if (r->r_src_len)
371 RTA_PUT(skb, RTA_SRC, 2, &r->r_src);
372 if (r->r_ifname[0])
373 RTA_PUT(skb, RTA_IIF, IFNAMSIZ, &r->r_ifname);
374 if (r->r_preference)
375 RTA_PUT(skb, RTA_PRIORITY, 4, &r->r_preference);
376 if (r->r_srcmap)
377 RTA_PUT(skb, RTA_GATEWAY, 2, &r->r_srcmap);
378 nlh->nlmsg_len = skb->tail - b;
379 return skb->len;
380
381nlmsg_failure:
382rtattr_failure:
383 skb_trim(skb, b - skb->data);
384 return -1;
385}
386
387int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
388{
389 int idx;
390 int s_idx = cb->args[0];
391 struct dn_fib_rule *r;
392
393 read_lock(&dn_fib_rules_lock);
394 for(r = dn_fib_rules, idx = 0; r; r = r->r_next, idx++) {
395 if (idx < s_idx)
396 continue;
397 if (dn_fib_fill_rule(skb, r, cb) < 0)
398 break;
399 }
400 read_unlock(&dn_fib_rules_lock);
401 cb->args[0] = idx;
402
403 return skb->len;
404}
405
406void __init dn_fib_rules_init(void)
407{
408 register_netdevice_notifier(&dn_fib_rules_notifier);
409}
410
411void __exit dn_fib_rules_cleanup(void)
412{
413 unregister_netdevice_notifier(&dn_fib_rules_notifier);
414}
415
416
diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c
new file mode 100644
index 000000000000..dad5603912be
--- /dev/null
+++ b/net/decnet/dn_table.c
@@ -0,0 +1,825 @@
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Routing Forwarding Information Base (Routing Tables)
7 *
8 * Author: Steve Whitehouse <SteveW@ACM.org>
9 * Mostly copied from the IPv4 routing code
10 *
11 *
12 * Changes:
13 *
14 */
15#include <linux/config.h>
16#include <linux/string.h>
17#include <linux/net.h>
18#include <linux/socket.h>
19#include <linux/sockios.h>
20#include <linux/init.h>
21#include <linux/skbuff.h>
22#include <linux/netlink.h>
23#include <linux/rtnetlink.h>
24#include <linux/proc_fs.h>
25#include <linux/netdevice.h>
26#include <linux/timer.h>
27#include <linux/spinlock.h>
28#include <asm/atomic.h>
29#include <asm/uaccess.h>
30#include <linux/route.h> /* RTF_xxx */
31#include <net/neighbour.h>
32#include <net/dst.h>
33#include <net/flow.h>
34#include <net/dn.h>
35#include <net/dn_route.h>
36#include <net/dn_fib.h>
37#include <net/dn_neigh.h>
38#include <net/dn_dev.h>
39
40struct dn_zone
41{
42 struct dn_zone *dz_next;
43 struct dn_fib_node **dz_hash;
44 int dz_nent;
45 int dz_divisor;
46 u32 dz_hashmask;
47#define DZ_HASHMASK(dz) ((dz)->dz_hashmask)
48 int dz_order;
49 u16 dz_mask;
50#define DZ_MASK(dz) ((dz)->dz_mask)
51};
52
53struct dn_hash
54{
55 struct dn_zone *dh_zones[17];
56 struct dn_zone *dh_zone_list;
57};
58
59#define dz_key_0(key) ((key).datum = 0)
60#define dz_prefix(key,dz) ((key).datum)
61
62#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
63 for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
64
65#define endfor_nexthops(fi) }
66
67#define DN_MAX_DIVISOR 1024
68#define DN_S_ZOMBIE 1
69#define DN_S_ACCESSED 2
70
71#define DN_FIB_SCAN(f, fp) \
72for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next)
73
74#define DN_FIB_SCAN_KEY(f, fp, key) \
75for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next)
76
77#define RT_TABLE_MIN 1
78
79static DEFINE_RWLOCK(dn_fib_tables_lock);
80struct dn_fib_table *dn_fib_tables[RT_TABLE_MAX + 1];
81
82static kmem_cache_t *dn_hash_kmem;
83static int dn_fib_hash_zombies;
84
85static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz)
86{
87 u16 h = ntohs(key.datum)>>(16 - dz->dz_order);
88 h ^= (h >> 10);
89 h ^= (h >> 6);
90 h &= DZ_HASHMASK(dz);
91 return *(dn_fib_idx_t *)&h;
92}
93
94static inline dn_fib_key_t dz_key(u16 dst, struct dn_zone *dz)
95{
96 dn_fib_key_t k;
97 k.datum = dst & DZ_MASK(dz);
98 return k;
99}
100
101static inline struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz)
102{
103 return &dz->dz_hash[dn_hash(key, dz).datum];
104}
105
106static inline struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz)
107{
108 return dz->dz_hash[dn_hash(key, dz).datum];
109}
110
111static inline int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b)
112{
113 return a.datum == b.datum;
114}
115
116static inline int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b)
117{
118 return a.datum <= b.datum;
119}
120
121static inline void dn_rebuild_zone(struct dn_zone *dz,
122 struct dn_fib_node **old_ht,
123 int old_divisor)
124{
125 int i;
126 struct dn_fib_node *f, **fp, *next;
127
128 for(i = 0; i < old_divisor; i++) {
129 for(f = old_ht[i]; f; f = f->fn_next) {
130 next = f->fn_next;
131 for(fp = dn_chain_p(f->fn_key, dz);
132 *fp && dn_key_leq((*fp)->fn_key, f->fn_key);
133 fp = &(*fp)->fn_next)
134 /* NOTHING */;
135 f->fn_next = *fp;
136 *fp = f;
137 }
138 }
139}
140
141static void dn_rehash_zone(struct dn_zone *dz)
142{
143 struct dn_fib_node **ht, **old_ht;
144 int old_divisor, new_divisor;
145 u32 new_hashmask;
146
147 old_divisor = dz->dz_divisor;
148
149 switch(old_divisor) {
150 case 16:
151 new_divisor = 256;
152 new_hashmask = 0xFF;
153 break;
154 default:
155 printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n", old_divisor);
156 case 256:
157 new_divisor = 1024;
158 new_hashmask = 0x3FF;
159 break;
160 }
161
162 ht = kmalloc(new_divisor*sizeof(struct dn_fib_node*), GFP_KERNEL);
163
164 if (ht == NULL)
165 return;
166
167 memset(ht, 0, new_divisor*sizeof(struct dn_fib_node *));
168 write_lock_bh(&dn_fib_tables_lock);
169 old_ht = dz->dz_hash;
170 dz->dz_hash = ht;
171 dz->dz_hashmask = new_hashmask;
172 dz->dz_divisor = new_divisor;
173 dn_rebuild_zone(dz, old_ht, old_divisor);
174 write_unlock_bh(&dn_fib_tables_lock);
175 kfree(old_ht);
176}
177
178static void dn_free_node(struct dn_fib_node *f)
179{
180 dn_fib_release_info(DN_FIB_INFO(f));
181 kmem_cache_free(dn_hash_kmem, f);
182}
183
184
185static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
186{
187 int i;
188 struct dn_zone *dz = kmalloc(sizeof(struct dn_zone), GFP_KERNEL);
189 if (!dz)
190 return NULL;
191
192 memset(dz, 0, sizeof(struct dn_zone));
193 if (z) {
194 dz->dz_divisor = 16;
195 dz->dz_hashmask = 0x0F;
196 } else {
197 dz->dz_divisor = 1;
198 dz->dz_hashmask = 0;
199 }
200
201 dz->dz_hash = kmalloc(dz->dz_divisor*sizeof(struct dn_fib_node *), GFP_KERNEL);
202
203 if (!dz->dz_hash) {
204 kfree(dz);
205 return NULL;
206 }
207
208 memset(dz->dz_hash, 0, dz->dz_divisor*sizeof(struct dn_fib_node*));
209 dz->dz_order = z;
210 dz->dz_mask = dnet_make_mask(z);
211
212 for(i = z + 1; i <= 16; i++)
213 if (table->dh_zones[i])
214 break;
215
216 write_lock_bh(&dn_fib_tables_lock);
217 if (i>16) {
218 dz->dz_next = table->dh_zone_list;
219 table->dh_zone_list = dz;
220 } else {
221 dz->dz_next = table->dh_zones[i]->dz_next;
222 table->dh_zones[i]->dz_next = dz;
223 }
224 table->dh_zones[z] = dz;
225 write_unlock_bh(&dn_fib_tables_lock);
226 return dz;
227}
228
229
230static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi)
231{
232 struct rtnexthop *nhp;
233 int nhlen;
234
235 if (rta->rta_priority && *rta->rta_priority != fi->fib_priority)
236 return 1;
237
238 if (rta->rta_oif || rta->rta_gw) {
239 if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
240 (!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0))
241 return 0;
242 return 1;
243 }
244
245 if (rta->rta_mp == NULL)
246 return 0;
247
248 nhp = RTA_DATA(rta->rta_mp);
249 nhlen = RTA_PAYLOAD(rta->rta_mp);
250
251 for_nexthops(fi) {
252 int attrlen = nhlen - sizeof(struct rtnexthop);
253 dn_address gw;
254
255 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
256 return -EINVAL;
257 if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
258 return 1;
259 if (attrlen) {
260 gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
261
262 if (gw && gw != nh->nh_gw)
263 return 1;
264 }
265 nhp = RTNH_NEXT(nhp);
266 } endfor_nexthops(fi);
267
268 return 0;
269}
270
271static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
272 u8 tb_id, u8 type, u8 scope, void *dst, int dst_len,
273 struct dn_fib_info *fi)
274{
275 struct rtmsg *rtm;
276 struct nlmsghdr *nlh;
277 unsigned char *b = skb->tail;
278
279 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*rtm));
280 rtm = NLMSG_DATA(nlh);
281 rtm->rtm_family = AF_DECnet;
282 rtm->rtm_dst_len = dst_len;
283 rtm->rtm_src_len = 0;
284 rtm->rtm_tos = 0;
285 rtm->rtm_table = tb_id;
286 rtm->rtm_flags = fi->fib_flags;
287 rtm->rtm_scope = scope;
288 rtm->rtm_type = type;
289 if (rtm->rtm_dst_len)
290 RTA_PUT(skb, RTA_DST, 2, dst);
291 rtm->rtm_protocol = fi->fib_protocol;
292 if (fi->fib_priority)
293 RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority);
294 if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0)
295 goto rtattr_failure;
296 if (fi->fib_nhs == 1) {
297 if (fi->fib_nh->nh_gw)
298 RTA_PUT(skb, RTA_GATEWAY, 2, &fi->fib_nh->nh_gw);
299 if (fi->fib_nh->nh_oif)
300 RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif);
301 }
302 if (fi->fib_nhs > 1) {
303 struct rtnexthop *nhp;
304 struct rtattr *mp_head;
305 if (skb_tailroom(skb) <= RTA_SPACE(0))
306 goto rtattr_failure;
307 mp_head = (struct rtattr *)skb_put(skb, RTA_SPACE(0));
308
309 for_nexthops(fi) {
310 if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
311 goto rtattr_failure;
312 nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
313 nhp->rtnh_flags = nh->nh_flags & 0xFF;
314 nhp->rtnh_hops = nh->nh_weight - 1;
315 nhp->rtnh_ifindex = nh->nh_oif;
316 if (nh->nh_gw)
317 RTA_PUT(skb, RTA_GATEWAY, 2, &nh->nh_gw);
318 nhp->rtnh_len = skb->tail - (unsigned char *)nhp;
319 } endfor_nexthops(fi);
320 mp_head->rta_type = RTA_MULTIPATH;
321 mp_head->rta_len = skb->tail - (u8*)mp_head;
322 }
323
324 nlh->nlmsg_len = skb->tail - b;
325 return skb->len;
326
327
328nlmsg_failure:
329rtattr_failure:
330 skb_trim(skb, b - skb->data);
331 return -1;
332}
333
334
335static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, int tb_id,
336 struct nlmsghdr *nlh, struct netlink_skb_parms *req)
337{
338 struct sk_buff *skb;
339 u32 pid = req ? req->pid : 0;
340 int size = NLMSG_SPACE(sizeof(struct rtmsg) + 256);
341
342 skb = alloc_skb(size, GFP_KERNEL);
343 if (!skb)
344 return;
345
346 if (dn_fib_dump_info(skb, pid, nlh->nlmsg_seq, event, tb_id,
347 f->fn_type, f->fn_scope, &f->fn_key, z,
348 DN_FIB_INFO(f)) < 0) {
349 kfree_skb(skb);
350 return;
351 }
352 NETLINK_CB(skb).dst_groups = RTMGRP_DECnet_ROUTE;
353 if (nlh->nlmsg_flags & NLM_F_ECHO)
354 atomic_inc(&skb->users);
355 netlink_broadcast(rtnl, skb, pid, RTMGRP_DECnet_ROUTE, GFP_KERNEL);
356 if (nlh->nlmsg_flags & NLM_F_ECHO)
357 netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
358}
359
360static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb,
361 struct netlink_callback *cb,
362 struct dn_fib_table *tb,
363 struct dn_zone *dz,
364 struct dn_fib_node *f)
365{
366 int i, s_i;
367
368 s_i = cb->args[3];
369 for(i = 0; f; i++, f = f->fn_next) {
370 if (i < s_i)
371 continue;
372 if (f->fn_state & DN_S_ZOMBIE)
373 continue;
374 if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).pid,
375 cb->nlh->nlmsg_seq,
376 RTM_NEWROUTE,
377 tb->n,
378 (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type,
379 f->fn_scope, &f->fn_key, dz->dz_order,
380 f->fn_info) < 0) {
381 cb->args[3] = i;
382 return -1;
383 }
384 }
385 cb->args[3] = i;
386 return skb->len;
387}
388
389static __inline__ int dn_hash_dump_zone(struct sk_buff *skb,
390 struct netlink_callback *cb,
391 struct dn_fib_table *tb,
392 struct dn_zone *dz)
393{
394 int h, s_h;
395
396 s_h = cb->args[2];
397 for(h = 0; h < dz->dz_divisor; h++) {
398 if (h < s_h)
399 continue;
400 if (h > s_h)
401 memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0]));
402 if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL)
403 continue;
404 if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) {
405 cb->args[2] = h;
406 return -1;
407 }
408 }
409 cb->args[2] = h;
410 return skb->len;
411}
412
413static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb,
414 struct netlink_callback *cb)
415{
416 int m, s_m;
417 struct dn_zone *dz;
418 struct dn_hash *table = (struct dn_hash *)tb->data;
419
420 s_m = cb->args[1];
421 read_lock(&dn_fib_tables_lock);
422 for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) {
423 if (m < s_m)
424 continue;
425 if (m > s_m)
426 memset(&cb->args[2], 0, sizeof(cb->args) - 2*sizeof(cb->args[0]));
427
428 if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) {
429 cb->args[1] = m;
430 read_unlock(&dn_fib_tables_lock);
431 return -1;
432 }
433 }
434 read_unlock(&dn_fib_tables_lock);
435 cb->args[1] = m;
436
437 return skb->len;
438}
439
440static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
441{
442 struct dn_hash *table = (struct dn_hash *)tb->data;
443 struct dn_fib_node *new_f, *f, **fp, **del_fp;
444 struct dn_zone *dz;
445 struct dn_fib_info *fi;
446 int z = r->rtm_dst_len;
447 int type = r->rtm_type;
448 dn_fib_key_t key;
449 int err;
450
451 if (z > 16)
452 return -EINVAL;
453
454 dz = table->dh_zones[z];
455 if (!dz && !(dz = dn_new_zone(table, z)))
456 return -ENOBUFS;
457
458 dz_key_0(key);
459 if (rta->rta_dst) {
460 dn_address dst;
461 memcpy(&dst, rta->rta_dst, 2);
462 if (dst & ~DZ_MASK(dz))
463 return -EINVAL;
464 key = dz_key(dst, dz);
465 }
466
467 if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL)
468 return err;
469
470 if (dz->dz_nent > (dz->dz_divisor << 2) &&
471 dz->dz_divisor > DN_MAX_DIVISOR &&
472 (z==16 || (1<<z) > dz->dz_divisor))
473 dn_rehash_zone(dz);
474
475 fp = dn_chain_p(key, dz);
476
477 DN_FIB_SCAN(f, fp) {
478 if (dn_key_leq(key, f->fn_key))
479 break;
480 }
481
482 del_fp = NULL;
483
484 if (f && (f->fn_state & DN_S_ZOMBIE) &&
485 dn_key_eq(f->fn_key, key)) {
486 del_fp = fp;
487 fp = &f->fn_next;
488 f = *fp;
489 goto create;
490 }
491
492 DN_FIB_SCAN_KEY(f, fp, key) {
493 if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority)
494 break;
495 }
496
497 if (f && dn_key_eq(f->fn_key, key) &&
498 fi->fib_priority == DN_FIB_INFO(f)->fib_priority) {
499 struct dn_fib_node **ins_fp;
500
501 err = -EEXIST;
502 if (n->nlmsg_flags & NLM_F_EXCL)
503 goto out;
504
505 if (n->nlmsg_flags & NLM_F_REPLACE) {
506 del_fp = fp;
507 fp = &f->fn_next;
508 f = *fp;
509 goto replace;
510 }
511
512 ins_fp = fp;
513 err = -EEXIST;
514
515 DN_FIB_SCAN_KEY(f, fp, key) {
516 if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority)
517 break;
518 if (f->fn_type == type && f->fn_scope == r->rtm_scope
519 && DN_FIB_INFO(f) == fi)
520 goto out;
521 }
522
523 if (!(n->nlmsg_flags & NLM_F_APPEND)) {
524 fp = ins_fp;
525 f = *fp;
526 }
527 }
528
529create:
530 err = -ENOENT;
531 if (!(n->nlmsg_flags & NLM_F_CREATE))
532 goto out;
533
534replace:
535 err = -ENOBUFS;
536 new_f = kmem_cache_alloc(dn_hash_kmem, SLAB_KERNEL);
537 if (new_f == NULL)
538 goto out;
539
540 memset(new_f, 0, sizeof(struct dn_fib_node));
541
542 new_f->fn_key = key;
543 new_f->fn_type = type;
544 new_f->fn_scope = r->rtm_scope;
545 DN_FIB_INFO(new_f) = fi;
546
547 new_f->fn_next = f;
548 write_lock_bh(&dn_fib_tables_lock);
549 *fp = new_f;
550 write_unlock_bh(&dn_fib_tables_lock);
551 dz->dz_nent++;
552
553 if (del_fp) {
554 f = *del_fp;
555 write_lock_bh(&dn_fib_tables_lock);
556 *del_fp = f->fn_next;
557 write_unlock_bh(&dn_fib_tables_lock);
558
559 if (!(f->fn_state & DN_S_ZOMBIE))
560 dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
561 if (f->fn_state & DN_S_ACCESSED)
562 dn_rt_cache_flush(-1);
563 dn_free_node(f);
564 dz->dz_nent--;
565 } else {
566 dn_rt_cache_flush(-1);
567 }
568
569 dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req);
570
571 return 0;
572out:
573 dn_fib_release_info(fi);
574 return err;
575}
576
577
578static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
579{
580 struct dn_hash *table = (struct dn_hash*)tb->data;
581 struct dn_fib_node **fp, **del_fp, *f;
582 int z = r->rtm_dst_len;
583 struct dn_zone *dz;
584 dn_fib_key_t key;
585 int matched;
586
587
588 if (z > 16)
589 return -EINVAL;
590
591 if ((dz = table->dh_zones[z]) == NULL)
592 return -ESRCH;
593
594 dz_key_0(key);
595 if (rta->rta_dst) {
596 dn_address dst;
597 memcpy(&dst, rta->rta_dst, 2);
598 if (dst & ~DZ_MASK(dz))
599 return -EINVAL;
600 key = dz_key(dst, dz);
601 }
602
603 fp = dn_chain_p(key, dz);
604
605 DN_FIB_SCAN(f, fp) {
606 if (dn_key_eq(f->fn_key, key))
607 break;
608 if (dn_key_leq(key, f->fn_key))
609 return -ESRCH;
610 }
611
612 matched = 0;
613 del_fp = NULL;
614 DN_FIB_SCAN_KEY(f, fp, key) {
615 struct dn_fib_info *fi = DN_FIB_INFO(f);
616
617 if (f->fn_state & DN_S_ZOMBIE)
618 return -ESRCH;
619
620 matched++;
621
622 if (del_fp == NULL &&
623 (!r->rtm_type || f->fn_type == r->rtm_type) &&
624 (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
625 (!r->rtm_protocol ||
626 fi->fib_protocol == r->rtm_protocol) &&
627 dn_fib_nh_match(r, n, rta, fi) == 0)
628 del_fp = fp;
629 }
630
631 if (del_fp) {
632 f = *del_fp;
633 dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
634
635 if (matched != 1) {
636 write_lock_bh(&dn_fib_tables_lock);
637 *del_fp = f->fn_next;
638 write_unlock_bh(&dn_fib_tables_lock);
639
640 if (f->fn_state & DN_S_ACCESSED)
641 dn_rt_cache_flush(-1);
642 dn_free_node(f);
643 dz->dz_nent--;
644 } else {
645 f->fn_state |= DN_S_ZOMBIE;
646 if (f->fn_state & DN_S_ACCESSED) {
647 f->fn_state &= ~DN_S_ACCESSED;
648 dn_rt_cache_flush(-1);
649 }
650 if (++dn_fib_hash_zombies > 128)
651 dn_fib_flush();
652 }
653
654 return 0;
655 }
656
657 return -ESRCH;
658}
659
660static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table)
661{
662 int found = 0;
663 struct dn_fib_node *f;
664
665 while((f = *fp) != NULL) {
666 struct dn_fib_info *fi = DN_FIB_INFO(f);
667
668 if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) {
669 write_lock_bh(&dn_fib_tables_lock);
670 *fp = f->fn_next;
671 write_unlock_bh(&dn_fib_tables_lock);
672
673 dn_free_node(f);
674 found++;
675 continue;
676 }
677 fp = &f->fn_next;
678 }
679
680 return found;
681}
682
683static int dn_fib_table_flush(struct dn_fib_table *tb)
684{
685 struct dn_hash *table = (struct dn_hash *)tb->data;
686 struct dn_zone *dz;
687 int found = 0;
688
689 dn_fib_hash_zombies = 0;
690 for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
691 int i;
692 int tmp = 0;
693 for(i = dz->dz_divisor-1; i >= 0; i--)
694 tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table);
695 dz->dz_nent -= tmp;
696 found += tmp;
697 }
698
699 return found;
700}
701
702static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowi *flp, struct dn_fib_res *res)
703{
704 int err;
705 struct dn_zone *dz;
706 struct dn_hash *t = (struct dn_hash *)tb->data;
707
708 read_lock(&dn_fib_tables_lock);
709 for(dz = t->dh_zone_list; dz; dz = dz->dz_next) {
710 struct dn_fib_node *f;
711 dn_fib_key_t k = dz_key(flp->fld_dst, dz);
712
713 for(f = dz_chain(k, dz); f; f = f->fn_next) {
714 if (!dn_key_eq(k, f->fn_key)) {
715 if (dn_key_leq(k, f->fn_key))
716 break;
717 else
718 continue;
719 }
720
721 f->fn_state |= DN_S_ACCESSED;
722
723 if (f->fn_state&DN_S_ZOMBIE)
724 continue;
725
726 if (f->fn_scope < flp->fld_scope)
727 continue;
728
729 err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res);
730
731 if (err == 0) {
732 res->type = f->fn_type;
733 res->scope = f->fn_scope;
734 res->prefixlen = dz->dz_order;
735 goto out;
736 }
737 if (err < 0)
738 goto out;
739 }
740 }
741 err = 1;
742out:
743 read_unlock(&dn_fib_tables_lock);
744 return err;
745}
746
747
748struct dn_fib_table *dn_fib_get_table(int n, int create)
749{
750 struct dn_fib_table *t;
751
752 if (n < RT_TABLE_MIN)
753 return NULL;
754
755 if (n > RT_TABLE_MAX)
756 return NULL;
757
758 if (dn_fib_tables[n])
759 return dn_fib_tables[n];
760
761 if (!create)
762 return NULL;
763
764 if (in_interrupt() && net_ratelimit()) {
765 printk(KERN_DEBUG "DECnet: BUG! Attempt to create routing table from interrupt\n");
766 return NULL;
767 }
768 if ((t = kmalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash), GFP_KERNEL)) == NULL)
769 return NULL;
770
771 memset(t, 0, sizeof(struct dn_fib_table));
772
773 t->n = n;
774 t->insert = dn_fib_table_insert;
775 t->delete = dn_fib_table_delete;
776 t->lookup = dn_fib_table_lookup;
777 t->flush = dn_fib_table_flush;
778 t->dump = dn_fib_table_dump;
779 memset(t->data, 0, sizeof(struct dn_hash));
780 dn_fib_tables[n] = t;
781
782 return t;
783}
784
785static void dn_fib_del_tree(int n)
786{
787 struct dn_fib_table *t;
788
789 write_lock(&dn_fib_tables_lock);
790 t = dn_fib_tables[n];
791 dn_fib_tables[n] = NULL;
792 write_unlock(&dn_fib_tables_lock);
793
794 if (t) {
795 kfree(t);
796 }
797}
798
799struct dn_fib_table *dn_fib_empty_table(void)
800{
801 int id;
802
803 for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++)
804 if (dn_fib_tables[id] == NULL)
805 return dn_fib_get_table(id, 1);
806 return NULL;
807}
808
809void __init dn_fib_table_init(void)
810{
811 dn_hash_kmem = kmem_cache_create("dn_fib_info_cache",
812 sizeof(struct dn_fib_info),
813 0, SLAB_HWCACHE_ALIGN,
814 NULL, NULL);
815}
816
817void __exit dn_fib_table_cleanup(void)
818{
819 int i;
820
821 for (i = RT_TABLE_MIN; i <= RT_TABLE_MAX; ++i)
822 dn_fib_del_tree(i);
823
824 return;
825}
diff --git a/net/decnet/dn_timer.c b/net/decnet/dn_timer.c
new file mode 100644
index 000000000000..09825711d58a
--- /dev/null
+++ b/net/decnet/dn_timer.c
@@ -0,0 +1,109 @@
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Socket Timer Functions
7 *
8 * Author: Steve Whitehouse <SteveW@ACM.org>
9 *
10 *
11 * Changes:
12 * Steve Whitehouse : Made keepalive timer part of the same
13 * timer idea.
14 * Steve Whitehouse : Added checks for sk->sock_readers
15 * David S. Miller : New socket locking
16 * Steve Whitehouse : Timer grabs socket ref.
17 */
18#include <linux/net.h>
19#include <linux/socket.h>
20#include <linux/skbuff.h>
21#include <linux/netdevice.h>
22#include <linux/timer.h>
23#include <linux/spinlock.h>
24#include <net/sock.h>
25#include <asm/atomic.h>
26#include <net/flow.h>
27#include <net/dn.h>
28
29/*
30 * Slow timer is for everything else (n * 500mS)
31 */
32
33#define SLOW_INTERVAL (HZ/2)
34
35static void dn_slow_timer(unsigned long arg);
36
37void dn_start_slow_timer(struct sock *sk)
38{
39 sk->sk_timer.expires = jiffies + SLOW_INTERVAL;
40 sk->sk_timer.function = dn_slow_timer;
41 sk->sk_timer.data = (unsigned long)sk;
42
43 add_timer(&sk->sk_timer);
44}
45
46void dn_stop_slow_timer(struct sock *sk)
47{
48 del_timer(&sk->sk_timer);
49}
50
51static void dn_slow_timer(unsigned long arg)
52{
53 struct sock *sk = (struct sock *)arg;
54 struct dn_scp *scp = DN_SK(sk);
55
56 sock_hold(sk);
57 bh_lock_sock(sk);
58
59 if (sock_owned_by_user(sk)) {
60 sk->sk_timer.expires = jiffies + HZ / 10;
61 add_timer(&sk->sk_timer);
62 goto out;
63 }
64
65 /*
66 * The persist timer is the standard slow timer used for retransmits
67 * in both connection establishment and disconnection as well as
68 * in the RUN state. The different states are catered for by changing
69 * the function pointer in the socket. Setting the timer to a value
70 * of zero turns it off. We allow the persist_fxn to turn the
71 * timer off in a permant way by returning non-zero, so that
72 * timer based routines may remove sockets. This is why we have a
73 * sock_hold()/sock_put() around the timer to prevent the socket
74 * going away in the middle.
75 */
76 if (scp->persist && scp->persist_fxn) {
77 if (scp->persist <= SLOW_INTERVAL) {
78 scp->persist = 0;
79
80 if (scp->persist_fxn(sk))
81 goto out;
82 } else {
83 scp->persist -= SLOW_INTERVAL;
84 }
85 }
86
87 /*
88 * Check for keepalive timeout. After the other timer 'cos if
89 * the previous timer caused a retransmit, we don't need to
90 * do this. scp->stamp is the last time that we sent a packet.
91 * The keepalive function sends a link service packet to the
92 * other end. If it remains unacknowledged, the standard
93 * socket timers will eventually shut the socket down. Each
94 * time we do this, scp->stamp will be updated, thus
95 * we won't try and send another until scp->keepalive has passed
96 * since the last successful transmission.
97 */
98 if (scp->keepalive && scp->keepalive_fxn && (scp->state == DN_RUN)) {
99 if ((jiffies - scp->stamp) >= scp->keepalive)
100 scp->keepalive_fxn(sk);
101 }
102
103 sk->sk_timer.expires = jiffies + SLOW_INTERVAL;
104
105 add_timer(&sk->sk_timer);
106out:
107 bh_unlock_sock(sk);
108 sock_put(sk);
109}
diff --git a/net/decnet/netfilter/Kconfig b/net/decnet/netfilter/Kconfig
new file mode 100644
index 000000000000..ecdb3f9f14ca
--- /dev/null
+++ b/net/decnet/netfilter/Kconfig
@@ -0,0 +1,15 @@
1#
2# DECnet netfilter configuration
3#
4
5menu "DECnet: Netfilter Configuration"
6 depends on DECNET && NETFILTER && EXPERIMENTAL
7
8config DECNET_NF_GRABULATOR
9 tristate "Routing message grabulator (for userland routing daemon)"
10 help
11 Enable this module if you want to use the userland DECnet routing
12 daemon. You will also need to enable routing support for DECnet
13 unless you just want to monitor routing messages from other nodes.
14
15endmenu
diff --git a/net/decnet/netfilter/Makefile b/net/decnet/netfilter/Makefile
new file mode 100644
index 000000000000..255c1ae9daeb
--- /dev/null
+++ b/net/decnet/netfilter/Makefile
@@ -0,0 +1,6 @@
1#
2# Makefile for DECnet netfilter modules
3#
4
5obj-$(CONFIG_DECNET_NF_GRABULATOR) += dn_rtmsg.o
6
diff --git a/net/decnet/netfilter/dn_rtmsg.c b/net/decnet/netfilter/dn_rtmsg.c
new file mode 100644
index 000000000000..f86a6259fd12
--- /dev/null
+++ b/net/decnet/netfilter/dn_rtmsg.c
@@ -0,0 +1,167 @@
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Routing Message Grabulator
7 *
8 * (C) 2000 ChyGwyn Limited - http://www.chygwyn.com/
9 * This code may be copied under the GPL v.2 or at your option
10 * any later version.
11 *
12 * Author: Steven Whitehouse <steve@chygwyn.com>
13 *
14 */
15#include <linux/module.h>
16#include <linux/skbuff.h>
17#include <linux/init.h>
18#include <linux/netdevice.h>
19#include <linux/netfilter.h>
20#include <linux/spinlock.h>
21#include <linux/netlink.h>
22
23#include <net/sock.h>
24#include <net/flow.h>
25#include <net/dn.h>
26#include <net/dn_route.h>
27
28#include <linux/netfilter_decnet.h>
29
30static struct sock *dnrmg = NULL;
31
32
33static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp)
34{
35 struct sk_buff *skb = NULL;
36 size_t size;
37 unsigned char *old_tail;
38 struct nlmsghdr *nlh;
39 unsigned char *ptr;
40 struct nf_dn_rtmsg *rtm;
41
42 size = NLMSG_SPACE(rt_skb->len);
43 size += NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg));
44 skb = alloc_skb(size, GFP_ATOMIC);
45 if (!skb)
46 goto nlmsg_failure;
47 old_tail = skb->tail;
48 nlh = NLMSG_PUT(skb, 0, 0, 0, size - sizeof(*nlh));
49 rtm = (struct nf_dn_rtmsg *)NLMSG_DATA(nlh);
50 rtm->nfdn_ifindex = rt_skb->dev->ifindex;
51 ptr = NFDN_RTMSG(rtm);
52 memcpy(ptr, rt_skb->data, rt_skb->len);
53 nlh->nlmsg_len = skb->tail - old_tail;
54 return skb;
55
56nlmsg_failure:
57 if (skb)
58 kfree_skb(skb);
59 *errp = -ENOMEM;
60 if (net_ratelimit())
61 printk(KERN_ERR "dn_rtmsg: error creating netlink message\n");
62 return NULL;
63}
64
65static void dnrmg_send_peer(struct sk_buff *skb)
66{
67 struct sk_buff *skb2;
68 int status = 0;
69 int group = 0;
70 unsigned char flags = *skb->data;
71
72 switch(flags & DN_RT_CNTL_MSK) {
73 case DN_RT_PKT_L1RT:
74 group = DNRMG_L1_GROUP;
75 break;
76 case DN_RT_PKT_L2RT:
77 group = DNRMG_L2_GROUP;
78 break;
79 default:
80 return;
81 }
82
83 skb2 = dnrmg_build_message(skb, &status);
84 if (skb2 == NULL)
85 return;
86 NETLINK_CB(skb2).dst_groups = group;
87 netlink_broadcast(dnrmg, skb2, 0, group, GFP_ATOMIC);
88}
89
90
91static unsigned int dnrmg_hook(unsigned int hook,
92 struct sk_buff **pskb,
93 const struct net_device *in,
94 const struct net_device *out,
95 int (*okfn)(struct sk_buff *))
96{
97 dnrmg_send_peer(*pskb);
98 return NF_ACCEPT;
99}
100
101
102#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
103
104static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
105{
106 struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
107
108 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
109 return;
110
111 if (!cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN))
112 RCV_SKB_FAIL(-EPERM);
113
114 /* Eventually we might send routing messages too */
115
116 RCV_SKB_FAIL(-EINVAL);
117}
118
119static void dnrmg_receive_user_sk(struct sock *sk, int len)
120{
121 struct sk_buff *skb;
122
123 while((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
124 dnrmg_receive_user_skb(skb);
125 kfree_skb(skb);
126 }
127}
128
129static struct nf_hook_ops dnrmg_ops = {
130 .hook = dnrmg_hook,
131 .pf = PF_DECnet,
132 .hooknum = NF_DN_ROUTE,
133 .priority = NF_DN_PRI_DNRTMSG,
134};
135
136static int __init init(void)
137{
138 int rv = 0;
139
140 dnrmg = netlink_kernel_create(NETLINK_DNRTMSG, dnrmg_receive_user_sk);
141 if (dnrmg == NULL) {
142 printk(KERN_ERR "dn_rtmsg: Cannot create netlink socket");
143 return -ENOMEM;
144 }
145
146 rv = nf_register_hook(&dnrmg_ops);
147 if (rv) {
148 sock_release(dnrmg->sk_socket);
149 }
150
151 return rv;
152}
153
154static void __exit fini(void)
155{
156 nf_unregister_hook(&dnrmg_ops);
157 sock_release(dnrmg->sk_socket);
158}
159
160
161MODULE_DESCRIPTION("DECnet Routing Message Grabulator");
162MODULE_AUTHOR("Steven Whitehouse <steve@chygwyn.com>");
163MODULE_LICENSE("GPL");
164
165module_init(init);
166module_exit(fini);
167
diff --git a/net/decnet/sysctl_net_decnet.c b/net/decnet/sysctl_net_decnet.c
new file mode 100644
index 000000000000..02bca49cb508
--- /dev/null
+++ b/net/decnet/sysctl_net_decnet.c
@@ -0,0 +1,480 @@
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet sysctl support functions
7 *
8 * Author: Steve Whitehouse <SteveW@ACM.org>
9 *
10 *
11 * Changes:
12 * Steve Whitehouse - C99 changes and default device handling
13 *
14 */
15#include <linux/config.h>
16#include <linux/mm.h>
17#include <linux/sysctl.h>
18#include <linux/fs.h>
19#include <linux/netdevice.h>
20#include <linux/string.h>
21#include <net/neighbour.h>
22#include <net/dst.h>
23#include <net/flow.h>
24
25#include <asm/uaccess.h>
26
27#include <net/dn.h>
28#include <net/dn_dev.h>
29#include <net/dn_route.h>
30
31
32int decnet_debug_level;
33int decnet_time_wait = 30;
34int decnet_dn_count = 1;
35int decnet_di_count = 3;
36int decnet_dr_count = 3;
37int decnet_log_martians = 1;
38int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;
39
40#ifdef CONFIG_SYSCTL
41extern int decnet_dst_gc_interval;
42static int min_decnet_time_wait[] = { 5 };
43static int max_decnet_time_wait[] = { 600 };
44static int min_state_count[] = { 1 };
45static int max_state_count[] = { NSP_MAXRXTSHIFT };
46static int min_decnet_dst_gc_interval[] = { 1 };
47static int max_decnet_dst_gc_interval[] = { 60 };
48static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
49static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
50static char node_name[7] = "???";
51
52static struct ctl_table_header *dn_table_header = NULL;
53
54/*
55 * ctype.h :-)
56 */
57#define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
58#define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
59#define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
60#define ISALPHA(x) (ISLOWER(x) || ISUPPER(x))
61#define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x))
62
63static void strip_it(char *str)
64{
65 for(;;) {
66 switch(*str) {
67 case ' ':
68 case '\n':
69 case '\r':
70 case ':':
71 *str = 0;
72 case 0:
73 return;
74 }
75 str++;
76 }
77}
78
79/*
80 * Simple routine to parse an ascii DECnet address
81 * into a network order address.
82 */
83static int parse_addr(dn_address *addr, char *str)
84{
85 dn_address area, node;
86
87 while(*str && !ISNUM(*str)) str++;
88
89 if (*str == 0)
90 return -1;
91
92 area = (*str++ - '0');
93 if (ISNUM(*str)) {
94 area *= 10;
95 area += (*str++ - '0');
96 }
97
98 if (*str++ != '.')
99 return -1;
100
101 if (!ISNUM(*str))
102 return -1;
103
104 node = *str++ - '0';
105 if (ISNUM(*str)) {
106 node *= 10;
107 node += (*str++ - '0');
108 }
109 if (ISNUM(*str)) {
110 node *= 10;
111 node += (*str++ - '0');
112 }
113 if (ISNUM(*str)) {
114 node *= 10;
115 node += (*str++ - '0');
116 }
117
118 if ((node > 1023) || (area > 63))
119 return -1;
120
121 if (INVALID_END_CHAR(*str))
122 return -1;
123
124 *addr = dn_htons((area << 10) | node);
125
126 return 0;
127}
128
129
130static int dn_node_address_strategy(ctl_table *table, int __user *name, int nlen,
131 void __user *oldval, size_t __user *oldlenp,
132 void __user *newval, size_t newlen,
133 void **context)
134{
135 size_t len;
136 dn_address addr;
137
138 if (oldval && oldlenp) {
139 if (get_user(len, oldlenp))
140 return -EFAULT;
141 if (len) {
142 if (len != sizeof(unsigned short))
143 return -EINVAL;
144 if (put_user(decnet_address, (unsigned short __user *)oldval))
145 return -EFAULT;
146 }
147 }
148 if (newval && newlen) {
149 if (newlen != sizeof(unsigned short))
150 return -EINVAL;
151 if (get_user(addr, (unsigned short __user *)newval))
152 return -EFAULT;
153
154 dn_dev_devices_off();
155
156 decnet_address = addr;
157
158 dn_dev_devices_on();
159 }
160 return 0;
161}
162
163static int dn_node_address_handler(ctl_table *table, int write,
164 struct file *filp,
165 void __user *buffer,
166 size_t *lenp, loff_t *ppos)
167{
168 char addr[DN_ASCBUF_LEN];
169 size_t len;
170 dn_address dnaddr;
171
172 if (!*lenp || (*ppos && !write)) {
173 *lenp = 0;
174 return 0;
175 }
176
177 if (write) {
178 int len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
179
180 if (copy_from_user(addr, buffer, len))
181 return -EFAULT;
182
183 addr[len] = 0;
184 strip_it(addr);
185
186 if (parse_addr(&dnaddr, addr))
187 return -EINVAL;
188
189 dn_dev_devices_off();
190
191 decnet_address = dnaddr;
192
193 dn_dev_devices_on();
194
195 *ppos += len;
196
197 return 0;
198 }
199
200 dn_addr2asc(dn_ntohs(decnet_address), addr);
201 len = strlen(addr);
202 addr[len++] = '\n';
203
204 if (len > *lenp) len = *lenp;
205
206 if (copy_to_user(buffer, addr, len))
207 return -EFAULT;
208
209 *lenp = len;
210 *ppos += len;
211
212 return 0;
213}
214
215
216static int dn_def_dev_strategy(ctl_table *table, int __user *name, int nlen,
217 void __user *oldval, size_t __user *oldlenp,
218 void __user *newval, size_t newlen,
219 void **context)
220{
221 size_t len;
222 struct net_device *dev;
223 char devname[17];
224 size_t namel;
225 int rv = 0;
226
227 devname[0] = 0;
228
229 if (oldval && oldlenp) {
230 if (get_user(len, oldlenp))
231 return -EFAULT;
232 if (len) {
233 dev = dn_dev_get_default();
234 if (dev) {
235 strcpy(devname, dev->name);
236 dev_put(dev);
237 }
238
239 namel = strlen(devname) + 1;
240 if (len > namel) len = namel;
241
242 if (copy_to_user(oldval, devname, len))
243 return -EFAULT;
244
245 if (put_user(len, oldlenp))
246 return -EFAULT;
247 }
248 }
249
250 if (newval && newlen) {
251 if (newlen > 16)
252 return -E2BIG;
253
254 if (copy_from_user(devname, newval, newlen))
255 return -EFAULT;
256
257 devname[newlen] = 0;
258
259 dev = dev_get_by_name(devname);
260 if (dev == NULL)
261 return -ENODEV;
262
263 rv = -ENODEV;
264 if (dev->dn_ptr != NULL) {
265 rv = dn_dev_set_default(dev, 1);
266 if (rv)
267 dev_put(dev);
268 }
269 }
270
271 return rv;
272}
273
274
275static int dn_def_dev_handler(ctl_table *table, int write,
276 struct file * filp,
277 void __user *buffer,
278 size_t *lenp, loff_t *ppos)
279{
280 size_t len;
281 struct net_device *dev;
282 char devname[17];
283
284 if (!*lenp || (*ppos && !write)) {
285 *lenp = 0;
286 return 0;
287 }
288
289 if (write) {
290 if (*lenp > 16)
291 return -E2BIG;
292
293 if (copy_from_user(devname, buffer, *lenp))
294 return -EFAULT;
295
296 devname[*lenp] = 0;
297 strip_it(devname);
298
299 dev = dev_get_by_name(devname);
300 if (dev == NULL)
301 return -ENODEV;
302
303 if (dev->dn_ptr == NULL) {
304 dev_put(dev);
305 return -ENODEV;
306 }
307
308 if (dn_dev_set_default(dev, 1)) {
309 dev_put(dev);
310 return -ENODEV;
311 }
312 *ppos += *lenp;
313
314 return 0;
315 }
316
317 dev = dn_dev_get_default();
318 if (dev == NULL) {
319 *lenp = 0;
320 return 0;
321 }
322
323 strcpy(devname, dev->name);
324 dev_put(dev);
325 len = strlen(devname);
326 devname[len++] = '\n';
327
328 if (len > *lenp) len = *lenp;
329
330 if (copy_to_user(buffer, devname, len))
331 return -EFAULT;
332
333 *lenp = len;
334 *ppos += len;
335
336 return 0;
337}
338
339static ctl_table dn_table[] = {
340 {
341 .ctl_name = NET_DECNET_NODE_ADDRESS,
342 .procname = "node_address",
343 .maxlen = 7,
344 .mode = 0644,
345 .proc_handler = dn_node_address_handler,
346 .strategy = dn_node_address_strategy,
347 },
348 {
349 .ctl_name = NET_DECNET_NODE_NAME,
350 .procname = "node_name",
351 .data = node_name,
352 .maxlen = 7,
353 .mode = 0644,
354 .proc_handler = &proc_dostring,
355 .strategy = &sysctl_string,
356 },
357 {
358 .ctl_name = NET_DECNET_DEFAULT_DEVICE,
359 .procname = "default_device",
360 .maxlen = 16,
361 .mode = 0644,
362 .proc_handler = dn_def_dev_handler,
363 .strategy = dn_def_dev_strategy,
364 },
365 {
366 .ctl_name = NET_DECNET_TIME_WAIT,
367 .procname = "time_wait",
368 .data = &decnet_time_wait,
369 .maxlen = sizeof(int),
370 .mode = 0644,
371 .proc_handler = &proc_dointvec_minmax,
372 .strategy = &sysctl_intvec,
373 .extra1 = &min_decnet_time_wait,
374 .extra2 = &max_decnet_time_wait
375 },
376 {
377 .ctl_name = NET_DECNET_DN_COUNT,
378 .procname = "dn_count",
379 .data = &decnet_dn_count,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = &proc_dointvec_minmax,
383 .strategy = &sysctl_intvec,
384 .extra1 = &min_state_count,
385 .extra2 = &max_state_count
386 },
387 {
388 .ctl_name = NET_DECNET_DI_COUNT,
389 .procname = "di_count",
390 .data = &decnet_di_count,
391 .maxlen = sizeof(int),
392 .mode = 0644,
393 .proc_handler = &proc_dointvec_minmax,
394 .strategy = &sysctl_intvec,
395 .extra1 = &min_state_count,
396 .extra2 = &max_state_count
397 },
398 {
399 .ctl_name = NET_DECNET_DR_COUNT,
400 .procname = "dr_count",
401 .data = &decnet_dr_count,
402 .maxlen = sizeof(int),
403 .mode = 0644,
404 .proc_handler = &proc_dointvec_minmax,
405 .strategy = &sysctl_intvec,
406 .extra1 = &min_state_count,
407 .extra2 = &max_state_count
408 },
409 {
410 .ctl_name = NET_DECNET_DST_GC_INTERVAL,
411 .procname = "dst_gc_interval",
412 .data = &decnet_dst_gc_interval,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = &proc_dointvec_minmax,
416 .strategy = &sysctl_intvec,
417 .extra1 = &min_decnet_dst_gc_interval,
418 .extra2 = &max_decnet_dst_gc_interval
419 },
420 {
421 .ctl_name = NET_DECNET_NO_FC_MAX_CWND,
422 .procname = "no_fc_max_cwnd",
423 .data = &decnet_no_fc_max_cwnd,
424 .maxlen = sizeof(int),
425 .mode = 0644,
426 .proc_handler = &proc_dointvec_minmax,
427 .strategy = &sysctl_intvec,
428 .extra1 = &min_decnet_no_fc_max_cwnd,
429 .extra2 = &max_decnet_no_fc_max_cwnd
430 },
431 {
432 .ctl_name = NET_DECNET_DEBUG_LEVEL,
433 .procname = "debug",
434 .data = &decnet_debug_level,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = &proc_dointvec,
438 .strategy = &sysctl_intvec,
439 },
440 {0}
441};
442
443static ctl_table dn_dir_table[] = {
444 {
445 .ctl_name = NET_DECNET,
446 .procname = "decnet",
447 .mode = 0555,
448 .child = dn_table},
449 {0}
450};
451
452static ctl_table dn_root_table[] = {
453 {
454 .ctl_name = CTL_NET,
455 .procname = "net",
456 .mode = 0555,
457 .child = dn_dir_table
458 },
459 {0}
460};
461
462void dn_register_sysctl(void)
463{
464 dn_table_header = register_sysctl_table(dn_root_table, 1);
465}
466
467void dn_unregister_sysctl(void)
468{
469 unregister_sysctl_table(dn_table_header);
470}
471
472#else /* CONFIG_SYSCTL */
473void dn_unregister_sysctl(void)
474{
475}
476void dn_register_sysctl(void)
477{
478}
479
480#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-21 09:30:29 -0500