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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/appletalk
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/appletalk')
-rw-r--r--net/appletalk/Makefile9
-rw-r--r--net/appletalk/aarp.c1069
-rw-r--r--net/appletalk/atalk_proc.c321
-rw-r--r--net/appletalk/ddp.c1931
-rw-r--r--net/appletalk/dev.c43
-rw-r--r--net/appletalk/sysctl_net_atalk.c83
6 files changed, 3456 insertions, 0 deletions
diff --git a/net/appletalk/Makefile b/net/appletalk/Makefile
new file mode 100644
index 00000000000..5cda56edef5
--- /dev/null
+++ b/net/appletalk/Makefile
@@ -0,0 +1,9 @@
1#
2# Makefile for the Linux AppleTalk layer.
3#
4
5obj-$(CONFIG_ATALK) += appletalk.o
6
7appletalk-y := aarp.o ddp.o dev.o
8appletalk-$(CONFIG_PROC_FS) += atalk_proc.o
9appletalk-$(CONFIG_SYSCTL) += sysctl_net_atalk.o
diff --git a/net/appletalk/aarp.c b/net/appletalk/aarp.c
new file mode 100644
index 00000000000..54640c01b50
--- /dev/null
+++ b/net/appletalk/aarp.c
@@ -0,0 +1,1069 @@
1/*
2 * AARP: An implementation of the AppleTalk AARP protocol for
3 * Ethernet 'ELAP'.
4 *
5 * Alan Cox <Alan.Cox@linux.org>
6 *
7 * This doesn't fit cleanly with the IP arp. Potentially we can use
8 * the generic neighbour discovery code to clean this up.
9 *
10 * FIXME:
11 * We ought to handle the retransmits with a single list and a
12 * separate fast timer for when it is needed.
13 * Use neighbour discovery code.
14 * Token Ring Support.
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
21 *
22 * References:
23 * Inside AppleTalk (2nd Ed).
24 * Fixes:
25 * Jaume Grau - flush caches on AARP_PROBE
26 * Rob Newberry - Added proxy AARP and AARP proc fs,
27 * moved probing from DDP module.
28 * Arnaldo C. Melo - don't mangle rx packets
29 *
30 */
31
32#include <linux/config.h>
33#include <linux/if_arp.h>
34#include <net/sock.h>
35#include <net/datalink.h>
36#include <net/psnap.h>
37#include <linux/atalk.h>
38#include <linux/init.h>
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
41
42int sysctl_aarp_expiry_time = AARP_EXPIRY_TIME;
43int sysctl_aarp_tick_time = AARP_TICK_TIME;
44int sysctl_aarp_retransmit_limit = AARP_RETRANSMIT_LIMIT;
45int sysctl_aarp_resolve_time = AARP_RESOLVE_TIME;
46
47/* Lists of aarp entries */
48/**
49 * struct aarp_entry - AARP entry
50 * @last_sent - Last time we xmitted the aarp request
51 * @packet_queue - Queue of frames wait for resolution
52 * @status - Used for proxy AARP
53 * expires_at - Entry expiry time
54 * target_addr - DDP Address
55 * dev - Device to use
56 * hwaddr - Physical i/f address of target/router
57 * xmit_count - When this hits 10 we give up
58 * next - Next entry in chain
59 */
60struct aarp_entry {
61 /* These first two are only used for unresolved entries */
62 unsigned long last_sent;
63 struct sk_buff_head packet_queue;
64 int status;
65 unsigned long expires_at;
66 struct atalk_addr target_addr;
67 struct net_device *dev;
68 char hwaddr[6];
69 unsigned short xmit_count;
70 struct aarp_entry *next;
71};
72
73/* Hashed list of resolved, unresolved and proxy entries */
74static struct aarp_entry *resolved[AARP_HASH_SIZE];
75static struct aarp_entry *unresolved[AARP_HASH_SIZE];
76static struct aarp_entry *proxies[AARP_HASH_SIZE];
77static int unresolved_count;
78
79/* One lock protects it all. */
80static DEFINE_RWLOCK(aarp_lock);
81
82/* Used to walk the list and purge/kick entries. */
83static struct timer_list aarp_timer;
84
85/*
86 * Delete an aarp queue
87 *
88 * Must run under aarp_lock.
89 */
90static void __aarp_expire(struct aarp_entry *a)
91{
92 skb_queue_purge(&a->packet_queue);
93 kfree(a);
94}
95
96/*
97 * Send an aarp queue entry request
98 *
99 * Must run under aarp_lock.
100 */
101static void __aarp_send_query(struct aarp_entry *a)
102{
103 static unsigned char aarp_eth_multicast[ETH_ALEN] =
104 { 0x09, 0x00, 0x07, 0xFF, 0xFF, 0xFF };
105 struct net_device *dev = a->dev;
106 struct elapaarp *eah;
107 int len = dev->hard_header_len + sizeof(*eah) + aarp_dl->header_length;
108 struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
109 struct atalk_addr *sat = atalk_find_dev_addr(dev);
110
111 if (!skb)
112 return;
113
114 if (!sat) {
115 kfree_skb(skb);
116 return;
117 }
118
119 /* Set up the buffer */
120 skb_reserve(skb, dev->hard_header_len + aarp_dl->header_length);
121 skb->nh.raw = skb->h.raw = skb_put(skb, sizeof(*eah));
122 skb->protocol = htons(ETH_P_ATALK);
123 skb->dev = dev;
124 eah = aarp_hdr(skb);
125
126 /* Set up the ARP */
127 eah->hw_type = htons(AARP_HW_TYPE_ETHERNET);
128 eah->pa_type = htons(ETH_P_ATALK);
129 eah->hw_len = ETH_ALEN;
130 eah->pa_len = AARP_PA_ALEN;
131 eah->function = htons(AARP_REQUEST);
132
133 memcpy(eah->hw_src, dev->dev_addr, ETH_ALEN);
134
135 eah->pa_src_zero = 0;
136 eah->pa_src_net = sat->s_net;
137 eah->pa_src_node = sat->s_node;
138
139 memset(eah->hw_dst, '\0', ETH_ALEN);
140
141 eah->pa_dst_zero = 0;
142 eah->pa_dst_net = a->target_addr.s_net;
143 eah->pa_dst_node = a->target_addr.s_node;
144
145 /* Send it */
146 aarp_dl->request(aarp_dl, skb, aarp_eth_multicast);
147 /* Update the sending count */
148 a->xmit_count++;
149 a->last_sent = jiffies;
150}
151
152/* This runs under aarp_lock and in softint context, so only atomic memory
153 * allocations can be used. */
154static void aarp_send_reply(struct net_device *dev, struct atalk_addr *us,
155 struct atalk_addr *them, unsigned char *sha)
156{
157 struct elapaarp *eah;
158 int len = dev->hard_header_len + sizeof(*eah) + aarp_dl->header_length;
159 struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
160
161 if (!skb)
162 return;
163
164 /* Set up the buffer */
165 skb_reserve(skb, dev->hard_header_len + aarp_dl->header_length);
166 skb->nh.raw = skb->h.raw = skb_put(skb, sizeof(*eah));
167 skb->protocol = htons(ETH_P_ATALK);
168 skb->dev = dev;
169 eah = aarp_hdr(skb);
170
171 /* Set up the ARP */
172 eah->hw_type = htons(AARP_HW_TYPE_ETHERNET);
173 eah->pa_type = htons(ETH_P_ATALK);
174 eah->hw_len = ETH_ALEN;
175 eah->pa_len = AARP_PA_ALEN;
176 eah->function = htons(AARP_REPLY);
177
178 memcpy(eah->hw_src, dev->dev_addr, ETH_ALEN);
179
180 eah->pa_src_zero = 0;
181 eah->pa_src_net = us->s_net;
182 eah->pa_src_node = us->s_node;
183
184 if (!sha)
185 memset(eah->hw_dst, '\0', ETH_ALEN);
186 else
187 memcpy(eah->hw_dst, sha, ETH_ALEN);
188
189 eah->pa_dst_zero = 0;
190 eah->pa_dst_net = them->s_net;
191 eah->pa_dst_node = them->s_node;
192
193 /* Send it */
194 aarp_dl->request(aarp_dl, skb, sha);
195}
196
197/*
198 * Send probe frames. Called from aarp_probe_network and
199 * aarp_proxy_probe_network.
200 */
201
202static void aarp_send_probe(struct net_device *dev, struct atalk_addr *us)
203{
204 struct elapaarp *eah;
205 int len = dev->hard_header_len + sizeof(*eah) + aarp_dl->header_length;
206 struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
207 static unsigned char aarp_eth_multicast[ETH_ALEN] =
208 { 0x09, 0x00, 0x07, 0xFF, 0xFF, 0xFF };
209
210 if (!skb)
211 return;
212
213 /* Set up the buffer */
214 skb_reserve(skb, dev->hard_header_len + aarp_dl->header_length);
215 skb->nh.raw = skb->h.raw = skb_put(skb, sizeof(*eah));
216 skb->protocol = htons(ETH_P_ATALK);
217 skb->dev = dev;
218 eah = aarp_hdr(skb);
219
220 /* Set up the ARP */
221 eah->hw_type = htons(AARP_HW_TYPE_ETHERNET);
222 eah->pa_type = htons(ETH_P_ATALK);
223 eah->hw_len = ETH_ALEN;
224 eah->pa_len = AARP_PA_ALEN;
225 eah->function = htons(AARP_PROBE);
226
227 memcpy(eah->hw_src, dev->dev_addr, ETH_ALEN);
228
229 eah->pa_src_zero = 0;
230 eah->pa_src_net = us->s_net;
231 eah->pa_src_node = us->s_node;
232
233 memset(eah->hw_dst, '\0', ETH_ALEN);
234
235 eah->pa_dst_zero = 0;
236 eah->pa_dst_net = us->s_net;
237 eah->pa_dst_node = us->s_node;
238
239 /* Send it */
240 aarp_dl->request(aarp_dl, skb, aarp_eth_multicast);
241}
242
243/*
244 * Handle an aarp timer expire
245 *
246 * Must run under the aarp_lock.
247 */
248
249static void __aarp_expire_timer(struct aarp_entry **n)
250{
251 struct aarp_entry *t;
252
253 while (*n)
254 /* Expired ? */
255 if (time_after(jiffies, (*n)->expires_at)) {
256 t = *n;
257 *n = (*n)->next;
258 __aarp_expire(t);
259 } else
260 n = &((*n)->next);
261}
262
263/*
264 * Kick all pending requests 5 times a second.
265 *
266 * Must run under the aarp_lock.
267 */
268static void __aarp_kick(struct aarp_entry **n)
269{
270 struct aarp_entry *t;
271
272 while (*n)
273 /* Expired: if this will be the 11th tx, we delete instead. */
274 if ((*n)->xmit_count >= sysctl_aarp_retransmit_limit) {
275 t = *n;
276 *n = (*n)->next;
277 __aarp_expire(t);
278 } else {
279 __aarp_send_query(*n);
280 n = &((*n)->next);
281 }
282}
283
284/*
285 * A device has gone down. Take all entries referring to the device
286 * and remove them.
287 *
288 * Must run under the aarp_lock.
289 */
290static void __aarp_expire_device(struct aarp_entry **n, struct net_device *dev)
291{
292 struct aarp_entry *t;
293
294 while (*n)
295 if ((*n)->dev == dev) {
296 t = *n;
297 *n = (*n)->next;
298 __aarp_expire(t);
299 } else
300 n = &((*n)->next);
301}
302
303/* Handle the timer event */
304static void aarp_expire_timeout(unsigned long unused)
305{
306 int ct;
307
308 write_lock_bh(&aarp_lock);
309
310 for (ct = 0; ct < AARP_HASH_SIZE; ct++) {
311 __aarp_expire_timer(&resolved[ct]);
312 __aarp_kick(&unresolved[ct]);
313 __aarp_expire_timer(&unresolved[ct]);
314 __aarp_expire_timer(&proxies[ct]);
315 }
316
317 write_unlock_bh(&aarp_lock);
318 mod_timer(&aarp_timer, jiffies +
319 (unresolved_count ? sysctl_aarp_tick_time :
320 sysctl_aarp_expiry_time));
321}
322
323/* Network device notifier chain handler. */
324static int aarp_device_event(struct notifier_block *this, unsigned long event,
325 void *ptr)
326{
327 int ct;
328
329 if (event == NETDEV_DOWN) {
330 write_lock_bh(&aarp_lock);
331
332 for (ct = 0; ct < AARP_HASH_SIZE; ct++) {
333 __aarp_expire_device(&resolved[ct], ptr);
334 __aarp_expire_device(&unresolved[ct], ptr);
335 __aarp_expire_device(&proxies[ct], ptr);
336 }
337
338 write_unlock_bh(&aarp_lock);
339 }
340 return NOTIFY_DONE;
341}
342
343/* Expire all entries in a hash chain */
344static void __aarp_expire_all(struct aarp_entry **n)
345{
346 struct aarp_entry *t;
347
348 while (*n) {
349 t = *n;
350 *n = (*n)->next;
351 __aarp_expire(t);
352 }
353}
354
355/* Cleanup all hash chains -- module unloading */
356static void aarp_purge(void)
357{
358 int ct;
359
360 write_lock_bh(&aarp_lock);
361 for (ct = 0; ct < AARP_HASH_SIZE; ct++) {
362 __aarp_expire_all(&resolved[ct]);
363 __aarp_expire_all(&unresolved[ct]);
364 __aarp_expire_all(&proxies[ct]);
365 }
366 write_unlock_bh(&aarp_lock);
367}
368
369/*
370 * Create a new aarp entry. This must use GFP_ATOMIC because it
371 * runs while holding spinlocks.
372 */
373static struct aarp_entry *aarp_alloc(void)
374{
375 struct aarp_entry *a = kmalloc(sizeof(*a), GFP_ATOMIC);
376
377 if (a)
378 skb_queue_head_init(&a->packet_queue);
379 return a;
380}
381
382/*
383 * Find an entry. We might return an expired but not yet purged entry. We
384 * don't care as it will do no harm.
385 *
386 * This must run under the aarp_lock.
387 */
388static struct aarp_entry *__aarp_find_entry(struct aarp_entry *list,
389 struct net_device *dev,
390 struct atalk_addr *sat)
391{
392 while (list) {
393 if (list->target_addr.s_net == sat->s_net &&
394 list->target_addr.s_node == sat->s_node &&
395 list->dev == dev)
396 break;
397 list = list->next;
398 }
399
400 return list;
401}
402
403/* Called from the DDP code, and thus must be exported. */
404void aarp_proxy_remove(struct net_device *dev, struct atalk_addr *sa)
405{
406 int hash = sa->s_node % (AARP_HASH_SIZE - 1);
407 struct aarp_entry *a;
408
409 write_lock_bh(&aarp_lock);
410
411 a = __aarp_find_entry(proxies[hash], dev, sa);
412 if (a)
413 a->expires_at = jiffies - 1;
414
415 write_unlock_bh(&aarp_lock);
416}
417
418/* This must run under aarp_lock. */
419static struct atalk_addr *__aarp_proxy_find(struct net_device *dev,
420 struct atalk_addr *sa)
421{
422 int hash = sa->s_node % (AARP_HASH_SIZE - 1);
423 struct aarp_entry *a = __aarp_find_entry(proxies[hash], dev, sa);
424
425 return a ? sa : NULL;
426}
427
428/*
429 * Probe a Phase 1 device or a device that requires its Net:Node to
430 * be set via an ioctl.
431 */
432static void aarp_send_probe_phase1(struct atalk_iface *iface)
433{
434 struct ifreq atreq;
435 struct sockaddr_at *sa = (struct sockaddr_at *)&atreq.ifr_addr;
436
437 sa->sat_addr.s_node = iface->address.s_node;
438 sa->sat_addr.s_net = ntohs(iface->address.s_net);
439
440 /* We pass the Net:Node to the drivers/cards by a Device ioctl. */
441 if (!(iface->dev->do_ioctl(iface->dev, &atreq, SIOCSIFADDR))) {
442 (void)iface->dev->do_ioctl(iface->dev, &atreq, SIOCGIFADDR);
443 if (iface->address.s_net != htons(sa->sat_addr.s_net) ||
444 iface->address.s_node != sa->sat_addr.s_node)
445 iface->status |= ATIF_PROBE_FAIL;
446
447 iface->address.s_net = htons(sa->sat_addr.s_net);
448 iface->address.s_node = sa->sat_addr.s_node;
449 }
450}
451
452
453void aarp_probe_network(struct atalk_iface *atif)
454{
455 if (atif->dev->type == ARPHRD_LOCALTLK ||
456 atif->dev->type == ARPHRD_PPP)
457 aarp_send_probe_phase1(atif);
458 else {
459 unsigned int count;
460
461 for (count = 0; count < AARP_RETRANSMIT_LIMIT; count++) {
462 aarp_send_probe(atif->dev, &atif->address);
463
464 /* Defer 1/10th */
465 current->state = TASK_INTERRUPTIBLE;
466 schedule_timeout(HZ / 10);
467
468 if (atif->status & ATIF_PROBE_FAIL)
469 break;
470 }
471 }
472}
473
474int aarp_proxy_probe_network(struct atalk_iface *atif, struct atalk_addr *sa)
475{
476 int hash, retval = -EPROTONOSUPPORT;
477 struct aarp_entry *entry;
478 unsigned int count;
479
480 /*
481 * we don't currently support LocalTalk or PPP for proxy AARP;
482 * if someone wants to try and add it, have fun
483 */
484 if (atif->dev->type == ARPHRD_LOCALTLK ||
485 atif->dev->type == ARPHRD_PPP)
486 goto out;
487
488 /*
489 * create a new AARP entry with the flags set to be published --
490 * we need this one to hang around even if it's in use
491 */
492 entry = aarp_alloc();
493 retval = -ENOMEM;
494 if (!entry)
495 goto out;
496
497 entry->expires_at = -1;
498 entry->status = ATIF_PROBE;
499 entry->target_addr.s_node = sa->s_node;
500 entry->target_addr.s_net = sa->s_net;
501 entry->dev = atif->dev;
502
503 write_lock_bh(&aarp_lock);
504
505 hash = sa->s_node % (AARP_HASH_SIZE - 1);
506 entry->next = proxies[hash];
507 proxies[hash] = entry;
508
509 for (count = 0; count < AARP_RETRANSMIT_LIMIT; count++) {
510 aarp_send_probe(atif->dev, sa);
511
512 /* Defer 1/10th */
513 current->state = TASK_INTERRUPTIBLE;
514 write_unlock_bh(&aarp_lock);
515 schedule_timeout(HZ / 10);
516 write_lock_bh(&aarp_lock);
517
518 if (entry->status & ATIF_PROBE_FAIL)
519 break;
520 }
521
522 if (entry->status & ATIF_PROBE_FAIL) {
523 entry->expires_at = jiffies - 1; /* free the entry */
524 retval = -EADDRINUSE; /* return network full */
525 } else { /* clear the probing flag */
526 entry->status &= ~ATIF_PROBE;
527 retval = 1;
528 }
529
530 write_unlock_bh(&aarp_lock);
531out:
532 return retval;
533}
534
535/* Send a DDP frame */
536int aarp_send_ddp(struct net_device *dev, struct sk_buff *skb,
537 struct atalk_addr *sa, void *hwaddr)
538{
539 static char ddp_eth_multicast[ETH_ALEN] =
540 { 0x09, 0x00, 0x07, 0xFF, 0xFF, 0xFF };
541 int hash;
542 struct aarp_entry *a;
543
544 skb->nh.raw = skb->data;
545
546 /* Check for LocalTalk first */
547 if (dev->type == ARPHRD_LOCALTLK) {
548 struct atalk_addr *at = atalk_find_dev_addr(dev);
549 struct ddpehdr *ddp = (struct ddpehdr *)skb->data;
550 int ft = 2;
551
552 /*
553 * Compressible ?
554 *
555 * IFF: src_net == dest_net == device_net
556 * (zero matches anything)
557 */
558
559 if ((!ddp->deh_snet || at->s_net == ddp->deh_snet) &&
560 (!ddp->deh_dnet || at->s_net == ddp->deh_dnet)) {
561 skb_pull(skb, sizeof(*ddp) - 4);
562
563 /*
564 * The upper two remaining bytes are the port
565 * numbers we just happen to need. Now put the
566 * length in the lower two.
567 */
568 *((__u16 *)skb->data) = htons(skb->len);
569 ft = 1;
570 }
571 /*
572 * Nice and easy. No AARP type protocols occur here so we can
573 * just shovel it out with a 3 byte LLAP header
574 */
575
576 skb_push(skb, 3);
577 skb->data[0] = sa->s_node;
578 skb->data[1] = at->s_node;
579 skb->data[2] = ft;
580 skb->dev = dev;
581 goto sendit;
582 }
583
584 /* On a PPP link we neither compress nor aarp. */
585 if (dev->type == ARPHRD_PPP) {
586 skb->protocol = htons(ETH_P_PPPTALK);
587 skb->dev = dev;
588 goto sendit;
589 }
590
591 /* Non ELAP we cannot do. */
592 if (dev->type != ARPHRD_ETHER)
593 return -1;
594
595 skb->dev = dev;
596 skb->protocol = htons(ETH_P_ATALK);
597 hash = sa->s_node % (AARP_HASH_SIZE - 1);
598
599 /* Do we have a resolved entry? */
600 if (sa->s_node == ATADDR_BCAST) {
601 /* Send it */
602 ddp_dl->request(ddp_dl, skb, ddp_eth_multicast);
603 goto sent;
604 }
605
606 write_lock_bh(&aarp_lock);
607 a = __aarp_find_entry(resolved[hash], dev, sa);
608
609 if (a) { /* Return 1 and fill in the address */
610 a->expires_at = jiffies + (sysctl_aarp_expiry_time * 10);
611 ddp_dl->request(ddp_dl, skb, a->hwaddr);
612 write_unlock_bh(&aarp_lock);
613 goto sent;
614 }
615
616 /* Do we have an unresolved entry: This is the less common path */
617 a = __aarp_find_entry(unresolved[hash], dev, sa);
618 if (a) { /* Queue onto the unresolved queue */
619 skb_queue_tail(&a->packet_queue, skb);
620 goto out_unlock;
621 }
622
623 /* Allocate a new entry */
624 a = aarp_alloc();
625 if (!a) {
626 /* Whoops slipped... good job it's an unreliable protocol 8) */
627 write_unlock_bh(&aarp_lock);
628 return -1;
629 }
630
631 /* Set up the queue */
632 skb_queue_tail(&a->packet_queue, skb);
633 a->expires_at = jiffies + sysctl_aarp_resolve_time;
634 a->dev = dev;
635 a->next = unresolved[hash];
636 a->target_addr = *sa;
637 a->xmit_count = 0;
638 unresolved[hash] = a;
639 unresolved_count++;
640
641 /* Send an initial request for the address */
642 __aarp_send_query(a);
643
644 /*
645 * Switch to fast timer if needed (That is if this is the first
646 * unresolved entry to get added)
647 */
648
649 if (unresolved_count == 1)
650 mod_timer(&aarp_timer, jiffies + sysctl_aarp_tick_time);
651
652 /* Now finally, it is safe to drop the lock. */
653out_unlock:
654 write_unlock_bh(&aarp_lock);
655
656 /* Tell the ddp layer we have taken over for this frame. */
657 return 0;
658
659sendit:
660 if (skb->sk)
661 skb->priority = skb->sk->sk_priority;
662 dev_queue_xmit(skb);
663sent:
664 return 1;
665}
666
667/*
668 * An entry in the aarp unresolved queue has become resolved. Send
669 * all the frames queued under it.
670 *
671 * Must run under aarp_lock.
672 */
673static void __aarp_resolved(struct aarp_entry **list, struct aarp_entry *a,
674 int hash)
675{
676 struct sk_buff *skb;
677
678 while (*list)
679 if (*list == a) {
680 unresolved_count--;
681 *list = a->next;
682
683 /* Move into the resolved list */
684 a->next = resolved[hash];
685 resolved[hash] = a;
686
687 /* Kick frames off */
688 while ((skb = skb_dequeue(&a->packet_queue)) != NULL) {
689 a->expires_at = jiffies +
690 sysctl_aarp_expiry_time * 10;
691 ddp_dl->request(ddp_dl, skb, a->hwaddr);
692 }
693 } else
694 list = &((*list)->next);
695}
696
697/*
698 * This is called by the SNAP driver whenever we see an AARP SNAP
699 * frame. We currently only support Ethernet.
700 */
701static int aarp_rcv(struct sk_buff *skb, struct net_device *dev,
702 struct packet_type *pt)
703{
704 struct elapaarp *ea = aarp_hdr(skb);
705 int hash, ret = 0;
706 __u16 function;
707 struct aarp_entry *a;
708 struct atalk_addr sa, *ma, da;
709 struct atalk_iface *ifa;
710
711 /* We only do Ethernet SNAP AARP. */
712 if (dev->type != ARPHRD_ETHER)
713 goto out0;
714
715 /* Frame size ok? */
716 if (!skb_pull(skb, sizeof(*ea)))
717 goto out0;
718
719 function = ntohs(ea->function);
720
721 /* Sanity check fields. */
722 if (function < AARP_REQUEST || function > AARP_PROBE ||
723 ea->hw_len != ETH_ALEN || ea->pa_len != AARP_PA_ALEN ||
724 ea->pa_src_zero || ea->pa_dst_zero)
725 goto out0;
726
727 /* Looks good. */
728 hash = ea->pa_src_node % (AARP_HASH_SIZE - 1);
729
730 /* Build an address. */
731 sa.s_node = ea->pa_src_node;
732 sa.s_net = ea->pa_src_net;
733
734 /* Process the packet. Check for replies of me. */
735 ifa = atalk_find_dev(dev);
736 if (!ifa)
737 goto out1;
738
739 if (ifa->status & ATIF_PROBE &&
740 ifa->address.s_node == ea->pa_dst_node &&
741 ifa->address.s_net == ea->pa_dst_net) {
742 ifa->status |= ATIF_PROBE_FAIL; /* Fail the probe (in use) */
743 goto out1;
744 }
745
746 /* Check for replies of proxy AARP entries */
747 da.s_node = ea->pa_dst_node;
748 da.s_net = ea->pa_dst_net;
749
750 write_lock_bh(&aarp_lock);
751 a = __aarp_find_entry(proxies[hash], dev, &da);
752
753 if (a && a->status & ATIF_PROBE) {
754 a->status |= ATIF_PROBE_FAIL;
755 /*
756 * we do not respond to probe or request packets for
757 * this address while we are probing this address
758 */
759 goto unlock;
760 }
761
762 switch (function) {
763 case AARP_REPLY:
764 if (!unresolved_count) /* Speed up */
765 break;
766
767 /* Find the entry. */
768 a = __aarp_find_entry(unresolved[hash], dev, &sa);
769 if (!a || dev != a->dev)
770 break;
771
772 /* We can fill one in - this is good. */
773 memcpy(a->hwaddr, ea->hw_src, ETH_ALEN);
774 __aarp_resolved(&unresolved[hash], a, hash);
775 if (!unresolved_count)
776 mod_timer(&aarp_timer,
777 jiffies + sysctl_aarp_expiry_time);
778 break;
779
780 case AARP_REQUEST:
781 case AARP_PROBE:
782
783 /*
784 * If it is my address set ma to my address and reply.
785 * We can treat probe and request the same. Probe
786 * simply means we shouldn't cache the querying host,
787 * as in a probe they are proposing an address not
788 * using one.
789 *
790 * Support for proxy-AARP added. We check if the
791 * address is one of our proxies before we toss the
792 * packet out.
793 */
794
795 sa.s_node = ea->pa_dst_node;
796 sa.s_net = ea->pa_dst_net;
797
798 /* See if we have a matching proxy. */
799 ma = __aarp_proxy_find(dev, &sa);
800 if (!ma)
801 ma = &ifa->address;
802 else { /* We need to make a copy of the entry. */
803 da.s_node = sa.s_node;
804 da.s_net = da.s_net;
805 ma = &da;
806 }
807
808 if (function == AARP_PROBE) {
809 /*
810 * A probe implies someone trying to get an
811 * address. So as a precaution flush any
812 * entries we have for this address.
813 */
814 struct aarp_entry *a;
815
816 a = __aarp_find_entry(resolved[sa.s_node %
817 (AARP_HASH_SIZE - 1)],
818 skb->dev, &sa);
819
820 /*
821 * Make it expire next tick - that avoids us
822 * getting into a probe/flush/learn/probe/
823 * flush/learn cycle during probing of a slow
824 * to respond host addr.
825 */
826 if (a) {
827 a->expires_at = jiffies - 1;
828 mod_timer(&aarp_timer, jiffies +
829 sysctl_aarp_tick_time);
830 }
831 }
832
833 if (sa.s_node != ma->s_node)
834 break;
835
836 if (sa.s_net && ma->s_net && sa.s_net != ma->s_net)
837 break;
838
839 sa.s_node = ea->pa_src_node;
840 sa.s_net = ea->pa_src_net;
841
842 /* aarp_my_address has found the address to use for us.
843 */
844 aarp_send_reply(dev, ma, &sa, ea->hw_src);
845 break;
846 }
847
848unlock:
849 write_unlock_bh(&aarp_lock);
850out1:
851 ret = 1;
852out0:
853 kfree_skb(skb);
854 return ret;
855}
856
857static struct notifier_block aarp_notifier = {
858 .notifier_call = aarp_device_event,
859};
860
861static unsigned char aarp_snap_id[] = { 0x00, 0x00, 0x00, 0x80, 0xF3 };
862
863void __init aarp_proto_init(void)
864{
865 aarp_dl = register_snap_client(aarp_snap_id, aarp_rcv);
866 if (!aarp_dl)
867 printk(KERN_CRIT "Unable to register AARP with SNAP.\n");
868 init_timer(&aarp_timer);
869 aarp_timer.function = aarp_expire_timeout;
870 aarp_timer.data = 0;
871 aarp_timer.expires = jiffies + sysctl_aarp_expiry_time;
872 add_timer(&aarp_timer);
873 register_netdevice_notifier(&aarp_notifier);
874}
875
876/* Remove the AARP entries associated with a device. */
877void aarp_device_down(struct net_device *dev)
878{
879 int ct;
880
881 write_lock_bh(&aarp_lock);
882
883 for (ct = 0; ct < AARP_HASH_SIZE; ct++) {
884 __aarp_expire_device(&resolved[ct], dev);
885 __aarp_expire_device(&unresolved[ct], dev);
886 __aarp_expire_device(&proxies[ct], dev);
887 }
888
889 write_unlock_bh(&aarp_lock);
890}
891
892#ifdef CONFIG_PROC_FS
893struct aarp_iter_state {
894 int bucket;
895 struct aarp_entry **table;
896};
897
898/*
899 * Get the aarp entry that is in the chain described
900 * by the iterator.
901 * If pos is set then skip till that index.
902 * pos = 1 is the first entry
903 */
904static struct aarp_entry *iter_next(struct aarp_iter_state *iter, loff_t *pos)
905{
906 int ct = iter->bucket;
907 struct aarp_entry **table = iter->table;
908 loff_t off = 0;
909 struct aarp_entry *entry;
910
911 rescan:
912 while(ct < AARP_HASH_SIZE) {
913 for (entry = table[ct]; entry; entry = entry->next) {
914 if (!pos || ++off == *pos) {
915 iter->table = table;
916 iter->bucket = ct;
917 return entry;
918 }
919 }
920 ++ct;
921 }
922
923 if (table == resolved) {
924 ct = 0;
925 table = unresolved;
926 goto rescan;
927 }
928 if (table == unresolved) {
929 ct = 0;
930 table = proxies;
931 goto rescan;
932 }
933 return NULL;
934}
935
936static void *aarp_seq_start(struct seq_file *seq, loff_t *pos)
937{
938 struct aarp_iter_state *iter = seq->private;
939
940 read_lock_bh(&aarp_lock);
941 iter->table = resolved;
942 iter->bucket = 0;
943
944 return *pos ? iter_next(iter, pos) : SEQ_START_TOKEN;
945}
946
947static void *aarp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
948{
949 struct aarp_entry *entry = v;
950 struct aarp_iter_state *iter = seq->private;
951
952 ++*pos;
953
954 /* first line after header */
955 if (v == SEQ_START_TOKEN)
956 entry = iter_next(iter, NULL);
957
958 /* next entry in current bucket */
959 else if (entry->next)
960 entry = entry->next;
961
962 /* next bucket or table */
963 else {
964 ++iter->bucket;
965 entry = iter_next(iter, NULL);
966 }
967 return entry;
968}
969
970static void aarp_seq_stop(struct seq_file *seq, void *v)
971{
972 read_unlock_bh(&aarp_lock);
973}
974
975static const char *dt2str(unsigned long ticks)
976{
977 static char buf[32];
978
979 sprintf(buf, "%ld.%02ld", ticks / HZ, ((ticks % HZ) * 100 ) / HZ);
980
981 return buf;
982}
983
984static int aarp_seq_show(struct seq_file *seq, void *v)
985{
986 struct aarp_iter_state *iter = seq->private;
987 struct aarp_entry *entry = v;
988 unsigned long now = jiffies;
989
990 if (v == SEQ_START_TOKEN)
991 seq_puts(seq,
992 "Address Interface Hardware Address"
993 " Expires LastSend Retry Status\n");
994 else {
995 seq_printf(seq, "%04X:%02X %-12s",
996 ntohs(entry->target_addr.s_net),
997 (unsigned int) entry->target_addr.s_node,
998 entry->dev ? entry->dev->name : "????");
999 seq_printf(seq, "%02X:%02X:%02X:%02X:%02X:%02X",
1000 entry->hwaddr[0] & 0xFF,
1001 entry->hwaddr[1] & 0xFF,
1002 entry->hwaddr[2] & 0xFF,
1003 entry->hwaddr[3] & 0xFF,
1004 entry->hwaddr[4] & 0xFF,
1005 entry->hwaddr[5] & 0xFF);
1006 seq_printf(seq, " %8s",
1007 dt2str((long)entry->expires_at - (long)now));
1008 if (iter->table == unresolved)
1009 seq_printf(seq, " %8s %6hu",
1010 dt2str(now - entry->last_sent),
1011 entry->xmit_count);
1012 else
1013 seq_puts(seq, " ");
1014 seq_printf(seq, " %s\n",
1015 (iter->table == resolved) ? "resolved"
1016 : (iter->table == unresolved) ? "unresolved"
1017 : (iter->table == proxies) ? "proxies"
1018 : "unknown");
1019 }
1020 return 0;
1021}
1022
1023static struct seq_operations aarp_seq_ops = {
1024 .start = aarp_seq_start,
1025 .next = aarp_seq_next,
1026 .stop = aarp_seq_stop,
1027 .show = aarp_seq_show,
1028};
1029
1030static int aarp_seq_open(struct inode *inode, struct file *file)
1031{
1032 struct seq_file *seq;
1033 int rc = -ENOMEM;
1034 struct aarp_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
1035
1036 if (!s)
1037 goto out;
1038
1039 rc = seq_open(file, &aarp_seq_ops);
1040 if (rc)
1041 goto out_kfree;
1042
1043 seq = file->private_data;
1044 seq->private = s;
1045 memset(s, 0, sizeof(*s));
1046out:
1047 return rc;
1048out_kfree:
1049 kfree(s);
1050 goto out;
1051}
1052
1053struct file_operations atalk_seq_arp_fops = {
1054 .owner = THIS_MODULE,
1055 .open = aarp_seq_open,
1056 .read = seq_read,
1057 .llseek = seq_lseek,
1058 .release = seq_release_private,
1059};
1060#endif
1061
1062/* General module cleanup. Called from cleanup_module() in ddp.c. */
1063void aarp_cleanup_module(void)
1064{
1065 del_timer_sync(&aarp_timer);
1066 unregister_netdevice_notifier(&aarp_notifier);
1067 unregister_snap_client(aarp_dl);
1068 aarp_purge();
1069}
diff --git a/net/appletalk/atalk_proc.c b/net/appletalk/atalk_proc.c
new file mode 100644
index 00000000000..dc4048dd98c
--- /dev/null
+++ b/net/appletalk/atalk_proc.c
@@ -0,0 +1,321 @@
1/*
2 * atalk_proc.c - proc support for Appletalk
3 *
4 * Copyright(c) Arnaldo Carvalho de Melo <acme@conectiva.com.br>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation, version 2.
9 */
10
11#include <linux/config.h>
12#include <linux/init.h>
13#include <linux/proc_fs.h>
14#include <linux/seq_file.h>
15#include <net/sock.h>
16#include <linux/atalk.h>
17
18
19static __inline__ struct atalk_iface *atalk_get_interface_idx(loff_t pos)
20{
21 struct atalk_iface *i;
22
23 for (i = atalk_interfaces; pos && i; i = i->next)
24 --pos;
25
26 return i;
27}
28
29static void *atalk_seq_interface_start(struct seq_file *seq, loff_t *pos)
30{
31 loff_t l = *pos;
32
33 read_lock_bh(&atalk_interfaces_lock);
34 return l ? atalk_get_interface_idx(--l) : SEQ_START_TOKEN;
35}
36
37static void *atalk_seq_interface_next(struct seq_file *seq, void *v, loff_t *pos)
38{
39 struct atalk_iface *i;
40
41 ++*pos;
42 if (v == SEQ_START_TOKEN) {
43 i = NULL;
44 if (atalk_interfaces)
45 i = atalk_interfaces;
46 goto out;
47 }
48 i = v;
49 i = i->next;
50out:
51 return i;
52}
53
54static void atalk_seq_interface_stop(struct seq_file *seq, void *v)
55{
56 read_unlock_bh(&atalk_interfaces_lock);
57}
58
59static int atalk_seq_interface_show(struct seq_file *seq, void *v)
60{
61 struct atalk_iface *iface;
62
63 if (v == SEQ_START_TOKEN) {
64 seq_puts(seq, "Interface Address Networks "
65 "Status\n");
66 goto out;
67 }
68
69 iface = v;
70 seq_printf(seq, "%-16s %04X:%02X %04X-%04X %d\n",
71 iface->dev->name, ntohs(iface->address.s_net),
72 iface->address.s_node, ntohs(iface->nets.nr_firstnet),
73 ntohs(iface->nets.nr_lastnet), iface->status);
74out:
75 return 0;
76}
77
78static __inline__ struct atalk_route *atalk_get_route_idx(loff_t pos)
79{
80 struct atalk_route *r;
81
82 for (r = atalk_routes; pos && r; r = r->next)
83 --pos;
84
85 return r;
86}
87
88static void *atalk_seq_route_start(struct seq_file *seq, loff_t *pos)
89{
90 loff_t l = *pos;
91
92 read_lock_bh(&atalk_routes_lock);
93 return l ? atalk_get_route_idx(--l) : SEQ_START_TOKEN;
94}
95
96static void *atalk_seq_route_next(struct seq_file *seq, void *v, loff_t *pos)
97{
98 struct atalk_route *r;
99
100 ++*pos;
101 if (v == SEQ_START_TOKEN) {
102 r = NULL;
103 if (atalk_routes)
104 r = atalk_routes;
105 goto out;
106 }
107 r = v;
108 r = r->next;
109out:
110 return r;
111}
112
113static void atalk_seq_route_stop(struct seq_file *seq, void *v)
114{
115 read_unlock_bh(&atalk_routes_lock);
116}
117
118static int atalk_seq_route_show(struct seq_file *seq, void *v)
119{
120 struct atalk_route *rt;
121
122 if (v == SEQ_START_TOKEN) {
123 seq_puts(seq, "Target Router Flags Dev\n");
124 goto out;
125 }
126
127 if (atrtr_default.dev) {
128 rt = &atrtr_default;
129 seq_printf(seq, "Default %04X:%02X %-4d %s\n",
130 ntohs(rt->gateway.s_net), rt->gateway.s_node,
131 rt->flags, rt->dev->name);
132 }
133
134 rt = v;
135 seq_printf(seq, "%04X:%02X %04X:%02X %-4d %s\n",
136 ntohs(rt->target.s_net), rt->target.s_node,
137 ntohs(rt->gateway.s_net), rt->gateway.s_node,
138 rt->flags, rt->dev->name);
139out:
140 return 0;
141}
142
143static __inline__ struct sock *atalk_get_socket_idx(loff_t pos)
144{
145 struct sock *s;
146 struct hlist_node *node;
147
148 sk_for_each(s, node, &atalk_sockets)
149 if (!pos--)
150 goto found;
151 s = NULL;
152found:
153 return s;
154}
155
156static void *atalk_seq_socket_start(struct seq_file *seq, loff_t *pos)
157{
158 loff_t l = *pos;
159
160 read_lock_bh(&atalk_sockets_lock);
161 return l ? atalk_get_socket_idx(--l) : SEQ_START_TOKEN;
162}
163
164static void *atalk_seq_socket_next(struct seq_file *seq, void *v, loff_t *pos)
165{
166 struct sock *i;
167
168 ++*pos;
169 if (v == SEQ_START_TOKEN) {
170 i = sk_head(&atalk_sockets);
171 goto out;
172 }
173 i = sk_next(v);
174out:
175 return i;
176}
177
178static void atalk_seq_socket_stop(struct seq_file *seq, void *v)
179{
180 read_unlock_bh(&atalk_sockets_lock);
181}
182
183static int atalk_seq_socket_show(struct seq_file *seq, void *v)
184{
185 struct sock *s;
186 struct atalk_sock *at;
187
188 if (v == SEQ_START_TOKEN) {
189 seq_printf(seq, "Type Local_addr Remote_addr Tx_queue "
190 "Rx_queue St UID\n");
191 goto out;
192 }
193
194 s = v;
195 at = at_sk(s);
196
197 seq_printf(seq, "%02X %04X:%02X:%02X %04X:%02X:%02X %08X:%08X "
198 "%02X %d\n",
199 s->sk_type, ntohs(at->src_net), at->src_node, at->src_port,
200 ntohs(at->dest_net), at->dest_node, at->dest_port,
201 atomic_read(&s->sk_wmem_alloc),
202 atomic_read(&s->sk_rmem_alloc),
203 s->sk_state, SOCK_INODE(s->sk_socket)->i_uid);
204out:
205 return 0;
206}
207
208static struct seq_operations atalk_seq_interface_ops = {
209 .start = atalk_seq_interface_start,
210 .next = atalk_seq_interface_next,
211 .stop = atalk_seq_interface_stop,
212 .show = atalk_seq_interface_show,
213};
214
215static struct seq_operations atalk_seq_route_ops = {
216 .start = atalk_seq_route_start,
217 .next = atalk_seq_route_next,
218 .stop = atalk_seq_route_stop,
219 .show = atalk_seq_route_show,
220};
221
222static struct seq_operations atalk_seq_socket_ops = {
223 .start = atalk_seq_socket_start,
224 .next = atalk_seq_socket_next,
225 .stop = atalk_seq_socket_stop,
226 .show = atalk_seq_socket_show,
227};
228
229static int atalk_seq_interface_open(struct inode *inode, struct file *file)
230{
231 return seq_open(file, &atalk_seq_interface_ops);
232}
233
234static int atalk_seq_route_open(struct inode *inode, struct file *file)
235{
236 return seq_open(file, &atalk_seq_route_ops);
237}
238
239static int atalk_seq_socket_open(struct inode *inode, struct file *file)
240{
241 return seq_open(file, &atalk_seq_socket_ops);
242}
243
244static struct file_operations atalk_seq_interface_fops = {
245 .owner = THIS_MODULE,
246 .open = atalk_seq_interface_open,
247 .read = seq_read,
248 .llseek = seq_lseek,
249 .release = seq_release,
250};
251
252static struct file_operations atalk_seq_route_fops = {
253 .owner = THIS_MODULE,
254 .open = atalk_seq_route_open,
255 .read = seq_read,
256 .llseek = seq_lseek,
257 .release = seq_release,
258};
259
260static struct file_operations atalk_seq_socket_fops = {
261 .owner = THIS_MODULE,
262 .open = atalk_seq_socket_open,
263 .read = seq_read,
264 .llseek = seq_lseek,
265 .release = seq_release,
266};
267
268static struct proc_dir_entry *atalk_proc_dir;
269
270int __init atalk_proc_init(void)
271{
272 struct proc_dir_entry *p;
273 int rc = -ENOMEM;
274
275 atalk_proc_dir = proc_mkdir("atalk", proc_net);
276 if (!atalk_proc_dir)
277 goto out;
278 atalk_proc_dir->owner = THIS_MODULE;
279
280 p = create_proc_entry("interface", S_IRUGO, atalk_proc_dir);
281 if (!p)
282 goto out_interface;
283 p->proc_fops = &atalk_seq_interface_fops;
284
285 p = create_proc_entry("route", S_IRUGO, atalk_proc_dir);
286 if (!p)
287 goto out_route;
288 p->proc_fops = &atalk_seq_route_fops;
289
290 p = create_proc_entry("socket", S_IRUGO, atalk_proc_dir);
291 if (!p)
292 goto out_socket;
293 p->proc_fops = &atalk_seq_socket_fops;
294
295 p = create_proc_entry("arp", S_IRUGO, atalk_proc_dir);
296 if (!p)
297 goto out_arp;
298 p->proc_fops = &atalk_seq_arp_fops;
299
300 rc = 0;
301out:
302 return rc;
303out_arp:
304 remove_proc_entry("socket", atalk_proc_dir);
305out_socket:
306 remove_proc_entry("route", atalk_proc_dir);
307out_route:
308 remove_proc_entry("interface", atalk_proc_dir);
309out_interface:
310 remove_proc_entry("atalk", proc_net);
311 goto out;
312}
313
314void __exit atalk_proc_exit(void)
315{
316 remove_proc_entry("interface", atalk_proc_dir);
317 remove_proc_entry("route", atalk_proc_dir);
318 remove_proc_entry("socket", atalk_proc_dir);
319 remove_proc_entry("arp", atalk_proc_dir);
320 remove_proc_entry("atalk", proc_net);
321}
diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
new file mode 100644
index 00000000000..d1fea5c3dda
--- /dev/null
+++ b/net/appletalk/ddp.c
@@ -0,0 +1,1931 @@
1/*
2 * DDP: An implementation of the AppleTalk DDP protocol for
3 * Ethernet 'ELAP'.
4 *
5 * Alan Cox <Alan.Cox@linux.org>
6 *
7 * With more than a little assistance from
8 *
9 * Wesley Craig <netatalk@umich.edu>
10 *
11 * Fixes:
12 * Neil Horman : Added missing device ioctls
13 * Michael Callahan : Made routing work
14 * Wesley Craig : Fix probing to listen to a
15 * passed node id.
16 * Alan Cox : Added send/recvmsg support
17 * Alan Cox : Moved at. to protinfo in
18 * socket.
19 * Alan Cox : Added firewall hooks.
20 * Alan Cox : Supports new ARPHRD_LOOPBACK
21 * Christer Weinigel : Routing and /proc fixes.
22 * Bradford Johnson : LocalTalk.
23 * Tom Dyas : Module support.
24 * Alan Cox : Hooks for PPP (based on the
25 * LocalTalk hook).
26 * Alan Cox : Posix bits
27 * Alan Cox/Mike Freeman : Possible fix to NBP problems
28 * Bradford Johnson : IP-over-DDP (experimental)
29 * Jay Schulist : Moved IP-over-DDP to its own
30 * driver file. (ipddp.c & ipddp.h)
31 * Jay Schulist : Made work as module with
32 * AppleTalk drivers, cleaned it.
33 * Rob Newberry : Added proxy AARP and AARP
34 * procfs, moved probing to AARP
35 * module.
36 * Adrian Sun/
37 * Michael Zuelsdorff : fix for net.0 packets. don't
38 * allow illegal ether/tokentalk
39 * port assignment. we lose a
40 * valid localtalk port as a
41 * result.
42 * Arnaldo C. de Melo : Cleanup, in preparation for
43 * shared skb support 8)
44 * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c,
45 * use seq_file
46 *
47 * This program is free software; you can redistribute it and/or
48 * modify it under the terms of the GNU General Public License
49 * as published by the Free Software Foundation; either version
50 * 2 of the License, or (at your option) any later version.
51 *
52 */
53
54#include <linux/config.h>
55#include <linux/module.h>
56#include <linux/tcp.h>
57#include <linux/if_arp.h>
58#include <linux/termios.h> /* For TIOCOUTQ/INQ */
59#include <net/datalink.h>
60#include <net/psnap.h>
61#include <net/sock.h>
62#include <net/route.h>
63#include <linux/atalk.h>
64
65struct datalink_proto *ddp_dl, *aarp_dl;
66static struct proto_ops atalk_dgram_ops;
67
68/**************************************************************************\
69* *
70* Handlers for the socket list. *
71* *
72\**************************************************************************/
73
74HLIST_HEAD(atalk_sockets);
75DEFINE_RWLOCK(atalk_sockets_lock);
76
77static inline void __atalk_insert_socket(struct sock *sk)
78{
79 sk_add_node(sk, &atalk_sockets);
80}
81
82static inline void atalk_remove_socket(struct sock *sk)
83{
84 write_lock_bh(&atalk_sockets_lock);
85 sk_del_node_init(sk);
86 write_unlock_bh(&atalk_sockets_lock);
87}
88
89static struct sock *atalk_search_socket(struct sockaddr_at *to,
90 struct atalk_iface *atif)
91{
92 struct sock *s;
93 struct hlist_node *node;
94
95 read_lock_bh(&atalk_sockets_lock);
96 sk_for_each(s, node, &atalk_sockets) {
97 struct atalk_sock *at = at_sk(s);
98
99 if (to->sat_port != at->src_port)
100 continue;
101
102 if (to->sat_addr.s_net == ATADDR_ANYNET &&
103 to->sat_addr.s_node == ATADDR_BCAST &&
104 at->src_net == atif->address.s_net)
105 goto found;
106
107 if (to->sat_addr.s_net == at->src_net &&
108 (to->sat_addr.s_node == at->src_node ||
109 to->sat_addr.s_node == ATADDR_BCAST ||
110 to->sat_addr.s_node == ATADDR_ANYNODE))
111 goto found;
112
113 /* XXXX.0 -- we got a request for this router. make sure
114 * that the node is appropriately set. */
115 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
116 to->sat_addr.s_net != ATADDR_ANYNET &&
117 atif->address.s_node == at->src_node) {
118 to->sat_addr.s_node = atif->address.s_node;
119 goto found;
120 }
121 }
122 s = NULL;
123found:
124 read_unlock_bh(&atalk_sockets_lock);
125 return s;
126}
127
128/**
129 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
130 * @sk - socket to insert in the list if it is not there already
131 * @sat - address to search for
132 *
133 * Try to find a socket matching ADDR in the socket list, if found then return
134 * it. If not, insert SK into the socket list.
135 *
136 * This entire operation must execute atomically.
137 */
138static struct sock *atalk_find_or_insert_socket(struct sock *sk,
139 struct sockaddr_at *sat)
140{
141 struct sock *s;
142 struct hlist_node *node;
143 struct atalk_sock *at;
144
145 write_lock_bh(&atalk_sockets_lock);
146 sk_for_each(s, node, &atalk_sockets) {
147 at = at_sk(s);
148
149 if (at->src_net == sat->sat_addr.s_net &&
150 at->src_node == sat->sat_addr.s_node &&
151 at->src_port == sat->sat_port)
152 goto found;
153 }
154 s = NULL;
155 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
156found:
157 write_unlock_bh(&atalk_sockets_lock);
158 return s;
159}
160
161static void atalk_destroy_timer(unsigned long data)
162{
163 struct sock *sk = (struct sock *)data;
164
165 if (atomic_read(&sk->sk_wmem_alloc) ||
166 atomic_read(&sk->sk_rmem_alloc)) {
167 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
168 add_timer(&sk->sk_timer);
169 } else
170 sock_put(sk);
171}
172
173static inline void atalk_destroy_socket(struct sock *sk)
174{
175 atalk_remove_socket(sk);
176 skb_queue_purge(&sk->sk_receive_queue);
177
178 if (atomic_read(&sk->sk_wmem_alloc) ||
179 atomic_read(&sk->sk_rmem_alloc)) {
180 init_timer(&sk->sk_timer);
181 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
182 sk->sk_timer.function = atalk_destroy_timer;
183 sk->sk_timer.data = (unsigned long)sk;
184 add_timer(&sk->sk_timer);
185 } else
186 sock_put(sk);
187}
188
189/**************************************************************************\
190* *
191* Routing tables for the AppleTalk socket layer. *
192* *
193\**************************************************************************/
194
195/* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
196struct atalk_route *atalk_routes;
197DEFINE_RWLOCK(atalk_routes_lock);
198
199struct atalk_iface *atalk_interfaces;
200DEFINE_RWLOCK(atalk_interfaces_lock);
201
202/* For probing devices or in a routerless network */
203struct atalk_route atrtr_default;
204
205/* AppleTalk interface control */
206/*
207 * Drop a device. Doesn't drop any of its routes - that is the caller's
208 * problem. Called when we down the interface or delete the address.
209 */
210static void atif_drop_device(struct net_device *dev)
211{
212 struct atalk_iface **iface = &atalk_interfaces;
213 struct atalk_iface *tmp;
214
215 write_lock_bh(&atalk_interfaces_lock);
216 while ((tmp = *iface) != NULL) {
217 if (tmp->dev == dev) {
218 *iface = tmp->next;
219 dev_put(dev);
220 kfree(tmp);
221 dev->atalk_ptr = NULL;
222 } else
223 iface = &tmp->next;
224 }
225 write_unlock_bh(&atalk_interfaces_lock);
226}
227
228static struct atalk_iface *atif_add_device(struct net_device *dev,
229 struct atalk_addr *sa)
230{
231 struct atalk_iface *iface = kmalloc(sizeof(*iface), GFP_KERNEL);
232
233 if (!iface)
234 goto out;
235
236 memset(iface, 0, sizeof(*iface));
237 dev_hold(dev);
238 iface->dev = dev;
239 dev->atalk_ptr = iface;
240 iface->address = *sa;
241 iface->status = 0;
242
243 write_lock_bh(&atalk_interfaces_lock);
244 iface->next = atalk_interfaces;
245 atalk_interfaces = iface;
246 write_unlock_bh(&atalk_interfaces_lock);
247out:
248 return iface;
249}
250
251/* Perform phase 2 AARP probing on our tentative address */
252static int atif_probe_device(struct atalk_iface *atif)
253{
254 int netrange = ntohs(atif->nets.nr_lastnet) -
255 ntohs(atif->nets.nr_firstnet) + 1;
256 int probe_net = ntohs(atif->address.s_net);
257 int probe_node = atif->address.s_node;
258 int netct, nodect;
259
260 /* Offset the network we start probing with */
261 if (probe_net == ATADDR_ANYNET) {
262 probe_net = ntohs(atif->nets.nr_firstnet);
263 if (netrange)
264 probe_net += jiffies % netrange;
265 }
266 if (probe_node == ATADDR_ANYNODE)
267 probe_node = jiffies & 0xFF;
268
269 /* Scan the networks */
270 atif->status |= ATIF_PROBE;
271 for (netct = 0; netct <= netrange; netct++) {
272 /* Sweep the available nodes from a given start */
273 atif->address.s_net = htons(probe_net);
274 for (nodect = 0; nodect < 256; nodect++) {
275 atif->address.s_node = (nodect + probe_node) & 0xFF;
276 if (atif->address.s_node > 0 &&
277 atif->address.s_node < 254) {
278 /* Probe a proposed address */
279 aarp_probe_network(atif);
280
281 if (!(atif->status & ATIF_PROBE_FAIL)) {
282 atif->status &= ~ATIF_PROBE;
283 return 0;
284 }
285 }
286 atif->status &= ~ATIF_PROBE_FAIL;
287 }
288 probe_net++;
289 if (probe_net > ntohs(atif->nets.nr_lastnet))
290 probe_net = ntohs(atif->nets.nr_firstnet);
291 }
292 atif->status &= ~ATIF_PROBE;
293
294 return -EADDRINUSE; /* Network is full... */
295}
296
297
298/* Perform AARP probing for a proxy address */
299static int atif_proxy_probe_device(struct atalk_iface *atif,
300 struct atalk_addr* proxy_addr)
301{
302 int netrange = ntohs(atif->nets.nr_lastnet) -
303 ntohs(atif->nets.nr_firstnet) + 1;
304 /* we probe the interface's network */
305 int probe_net = ntohs(atif->address.s_net);
306 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
307 int netct, nodect;
308
309 /* Offset the network we start probing with */
310 if (probe_net == ATADDR_ANYNET) {
311 probe_net = ntohs(atif->nets.nr_firstnet);
312 if (netrange)
313 probe_net += jiffies % netrange;
314 }
315
316 if (probe_node == ATADDR_ANYNODE)
317 probe_node = jiffies & 0xFF;
318
319 /* Scan the networks */
320 for (netct = 0; netct <= netrange; netct++) {
321 /* Sweep the available nodes from a given start */
322 proxy_addr->s_net = htons(probe_net);
323 for (nodect = 0; nodect < 256; nodect++) {
324 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
325 if (proxy_addr->s_node > 0 &&
326 proxy_addr->s_node < 254) {
327 /* Tell AARP to probe a proposed address */
328 int ret = aarp_proxy_probe_network(atif,
329 proxy_addr);
330
331 if (ret != -EADDRINUSE)
332 return ret;
333 }
334 }
335 probe_net++;
336 if (probe_net > ntohs(atif->nets.nr_lastnet))
337 probe_net = ntohs(atif->nets.nr_firstnet);
338 }
339
340 return -EADDRINUSE; /* Network is full... */
341}
342
343
344struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
345{
346 struct atalk_iface *iface = dev->atalk_ptr;
347 return iface ? &iface->address : NULL;
348}
349
350static struct atalk_addr *atalk_find_primary(void)
351{
352 struct atalk_iface *fiface = NULL;
353 struct atalk_addr *retval;
354 struct atalk_iface *iface;
355
356 /*
357 * Return a point-to-point interface only if
358 * there is no non-ptp interface available.
359 */
360 read_lock_bh(&atalk_interfaces_lock);
361 for (iface = atalk_interfaces; iface; iface = iface->next) {
362 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
363 fiface = iface;
364 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
365 retval = &iface->address;
366 goto out;
367 }
368 }
369
370 if (fiface)
371 retval = &fiface->address;
372 else if (atalk_interfaces)
373 retval = &atalk_interfaces->address;
374 else
375 retval = NULL;
376out:
377 read_unlock_bh(&atalk_interfaces_lock);
378 return retval;
379}
380
381/*
382 * Find a match for 'any network' - ie any of our interfaces with that
383 * node number will do just nicely.
384 */
385static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
386{
387 struct atalk_iface *iface = dev->atalk_ptr;
388
389 if (!iface || iface->status & ATIF_PROBE)
390 goto out_err;
391
392 if (node != ATADDR_BCAST &&
393 iface->address.s_node != node &&
394 node != ATADDR_ANYNODE)
395 goto out_err;
396out:
397 return iface;
398out_err:
399 iface = NULL;
400 goto out;
401}
402
403/* Find a match for a specific network:node pair */
404static struct atalk_iface *atalk_find_interface(int net, int node)
405{
406 struct atalk_iface *iface;
407
408 read_lock_bh(&atalk_interfaces_lock);
409 for (iface = atalk_interfaces; iface; iface = iface->next) {
410 if ((node == ATADDR_BCAST ||
411 node == ATADDR_ANYNODE ||
412 iface->address.s_node == node) &&
413 iface->address.s_net == net &&
414 !(iface->status & ATIF_PROBE))
415 break;
416
417 /* XXXX.0 -- net.0 returns the iface associated with net */
418 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
419 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
420 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
421 break;
422 }
423 read_unlock_bh(&atalk_interfaces_lock);
424 return iface;
425}
426
427
428/*
429 * Find a route for an AppleTalk packet. This ought to get cached in
430 * the socket (later on...). We know about host routes and the fact
431 * that a route must be direct to broadcast.
432 */
433static struct atalk_route *atrtr_find(struct atalk_addr *target)
434{
435 /*
436 * we must search through all routes unless we find a
437 * host route, because some host routes might overlap
438 * network routes
439 */
440 struct atalk_route *net_route = NULL;
441 struct atalk_route *r;
442
443 read_lock_bh(&atalk_routes_lock);
444 for (r = atalk_routes; r; r = r->next) {
445 if (!(r->flags & RTF_UP))
446 continue;
447
448 if (r->target.s_net == target->s_net) {
449 if (r->flags & RTF_HOST) {
450 /*
451 * if this host route is for the target,
452 * the we're done
453 */
454 if (r->target.s_node == target->s_node)
455 goto out;
456 } else
457 /*
458 * this route will work if there isn't a
459 * direct host route, so cache it
460 */
461 net_route = r;
462 }
463 }
464
465 /*
466 * if we found a network route but not a direct host
467 * route, then return it
468 */
469 if (net_route)
470 r = net_route;
471 else if (atrtr_default.dev)
472 r = &atrtr_default;
473 else /* No route can be found */
474 r = NULL;
475out:
476 read_unlock_bh(&atalk_routes_lock);
477 return r;
478}
479
480
481/*
482 * Given an AppleTalk network, find the device to use. This can be
483 * a simple lookup.
484 */
485struct net_device *atrtr_get_dev(struct atalk_addr *sa)
486{
487 struct atalk_route *atr = atrtr_find(sa);
488 return atr ? atr->dev : NULL;
489}
490
491/* Set up a default router */
492static void atrtr_set_default(struct net_device *dev)
493{
494 atrtr_default.dev = dev;
495 atrtr_default.flags = RTF_UP;
496 atrtr_default.gateway.s_net = htons(0);
497 atrtr_default.gateway.s_node = 0;
498}
499
500/*
501 * Add a router. Basically make sure it looks valid and stuff the
502 * entry in the list. While it uses netranges we always set them to one
503 * entry to work like netatalk.
504 */
505static int atrtr_create(struct rtentry *r, struct net_device *devhint)
506{
507 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
508 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
509 struct atalk_route *rt;
510 struct atalk_iface *iface, *riface;
511 int retval = -EINVAL;
512
513 /*
514 * Fixme: Raise/Lower a routing change semaphore for these
515 * operations.
516 */
517
518 /* Validate the request */
519 if (ta->sat_family != AF_APPLETALK ||
520 (!devhint && ga->sat_family != AF_APPLETALK))
521 goto out;
522
523 /* Now walk the routing table and make our decisions */
524 write_lock_bh(&atalk_routes_lock);
525 for (rt = atalk_routes; rt; rt = rt->next) {
526 if (r->rt_flags != rt->flags)
527 continue;
528
529 if (ta->sat_addr.s_net == rt->target.s_net) {
530 if (!(rt->flags & RTF_HOST))
531 break;
532 if (ta->sat_addr.s_node == rt->target.s_node)
533 break;
534 }
535 }
536
537 if (!devhint) {
538 riface = NULL;
539
540 read_lock_bh(&atalk_interfaces_lock);
541 for (iface = atalk_interfaces; iface; iface = iface->next) {
542 if (!riface &&
543 ntohs(ga->sat_addr.s_net) >=
544 ntohs(iface->nets.nr_firstnet) &&
545 ntohs(ga->sat_addr.s_net) <=
546 ntohs(iface->nets.nr_lastnet))
547 riface = iface;
548
549 if (ga->sat_addr.s_net == iface->address.s_net &&
550 ga->sat_addr.s_node == iface->address.s_node)
551 riface = iface;
552 }
553 read_unlock_bh(&atalk_interfaces_lock);
554
555 retval = -ENETUNREACH;
556 if (!riface)
557 goto out_unlock;
558
559 devhint = riface->dev;
560 }
561
562 if (!rt) {
563 rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
564
565 retval = -ENOBUFS;
566 if (!rt)
567 goto out_unlock;
568 memset(rt, 0, sizeof(*rt));
569
570 rt->next = atalk_routes;
571 atalk_routes = rt;
572 }
573
574 /* Fill in the routing entry */
575 rt->target = ta->sat_addr;
576 rt->dev = devhint;
577 rt->flags = r->rt_flags;
578 rt->gateway = ga->sat_addr;
579
580 retval = 0;
581out_unlock:
582 write_unlock_bh(&atalk_routes_lock);
583out:
584 return retval;
585}
586
587/* Delete a route. Find it and discard it */
588static int atrtr_delete(struct atalk_addr * addr)
589{
590 struct atalk_route **r = &atalk_routes;
591 int retval = 0;
592 struct atalk_route *tmp;
593
594 write_lock_bh(&atalk_routes_lock);
595 while ((tmp = *r) != NULL) {
596 if (tmp->target.s_net == addr->s_net &&
597 (!(tmp->flags&RTF_GATEWAY) ||
598 tmp->target.s_node == addr->s_node)) {
599 *r = tmp->next;
600 dev_put(tmp->dev);
601 kfree(tmp);
602 goto out;
603 }
604 r = &tmp->next;
605 }
606 retval = -ENOENT;
607out:
608 write_unlock_bh(&atalk_routes_lock);
609 return retval;
610}
611
612/*
613 * Called when a device is downed. Just throw away any routes
614 * via it.
615 */
616static void atrtr_device_down(struct net_device *dev)
617{
618 struct atalk_route **r = &atalk_routes;
619 struct atalk_route *tmp;
620
621 write_lock_bh(&atalk_routes_lock);
622 while ((tmp = *r) != NULL) {
623 if (tmp->dev == dev) {
624 *r = tmp->next;
625 dev_put(dev);
626 kfree(tmp);
627 } else
628 r = &tmp->next;
629 }
630 write_unlock_bh(&atalk_routes_lock);
631
632 if (atrtr_default.dev == dev)
633 atrtr_set_default(NULL);
634}
635
636/* Actually down the interface */
637static inline void atalk_dev_down(struct net_device *dev)
638{
639 atrtr_device_down(dev); /* Remove all routes for the device */
640 aarp_device_down(dev); /* Remove AARP entries for the device */
641 atif_drop_device(dev); /* Remove the device */
642}
643
644/*
645 * A device event has occurred. Watch for devices going down and
646 * delete our use of them (iface and route).
647 */
648static int ddp_device_event(struct notifier_block *this, unsigned long event,
649 void *ptr)
650{
651 if (event == NETDEV_DOWN)
652 /* Discard any use of this */
653 atalk_dev_down(ptr);
654
655 return NOTIFY_DONE;
656}
657
658/* ioctl calls. Shouldn't even need touching */
659/* Device configuration ioctl calls */
660static int atif_ioctl(int cmd, void __user *arg)
661{
662 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
663 struct ifreq atreq;
664 struct atalk_netrange *nr;
665 struct sockaddr_at *sa;
666 struct net_device *dev;
667 struct atalk_iface *atif;
668 int ct;
669 int limit;
670 struct rtentry rtdef;
671 int add_route;
672
673 if (copy_from_user(&atreq, arg, sizeof(atreq)))
674 return -EFAULT;
675
676 dev = __dev_get_by_name(atreq.ifr_name);
677 if (!dev)
678 return -ENODEV;
679
680 sa = (struct sockaddr_at *)&atreq.ifr_addr;
681 atif = atalk_find_dev(dev);
682
683 switch (cmd) {
684 case SIOCSIFADDR:
685 if (!capable(CAP_NET_ADMIN))
686 return -EPERM;
687 if (sa->sat_family != AF_APPLETALK)
688 return -EINVAL;
689 if (dev->type != ARPHRD_ETHER &&
690 dev->type != ARPHRD_LOOPBACK &&
691 dev->type != ARPHRD_LOCALTLK &&
692 dev->type != ARPHRD_PPP)
693 return -EPROTONOSUPPORT;
694
695 nr = (struct atalk_netrange *)&sa->sat_zero[0];
696 add_route = 1;
697
698 /*
699 * if this is a point-to-point iface, and we already
700 * have an iface for this AppleTalk address, then we
701 * should not add a route
702 */
703 if ((dev->flags & IFF_POINTOPOINT) &&
704 atalk_find_interface(sa->sat_addr.s_net,
705 sa->sat_addr.s_node)) {
706 printk(KERN_DEBUG "AppleTalk: point-to-point "
707 "interface added with "
708 "existing address\n");
709 add_route = 0;
710 }
711
712 /*
713 * Phase 1 is fine on LocalTalk but we don't do
714 * EtherTalk phase 1. Anyone wanting to add it go ahead.
715 */
716 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
717 return -EPROTONOSUPPORT;
718 if (sa->sat_addr.s_node == ATADDR_BCAST ||
719 sa->sat_addr.s_node == 254)
720 return -EINVAL;
721 if (atif) {
722 /* Already setting address */
723 if (atif->status & ATIF_PROBE)
724 return -EBUSY;
725
726 atif->address.s_net = sa->sat_addr.s_net;
727 atif->address.s_node = sa->sat_addr.s_node;
728 atrtr_device_down(dev); /* Flush old routes */
729 } else {
730 atif = atif_add_device(dev, &sa->sat_addr);
731 if (!atif)
732 return -ENOMEM;
733 }
734 atif->nets = *nr;
735
736 /*
737 * Check if the chosen address is used. If so we
738 * error and atalkd will try another.
739 */
740
741 if (!(dev->flags & IFF_LOOPBACK) &&
742 !(dev->flags & IFF_POINTOPOINT) &&
743 atif_probe_device(atif) < 0) {
744 atif_drop_device(dev);
745 return -EADDRINUSE;
746 }
747
748 /* Hey it worked - add the direct routes */
749 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
750 sa->sat_family = AF_APPLETALK;
751 sa->sat_addr.s_net = atif->address.s_net;
752 sa->sat_addr.s_node = atif->address.s_node;
753 sa = (struct sockaddr_at *)&rtdef.rt_dst;
754 rtdef.rt_flags = RTF_UP;
755 sa->sat_family = AF_APPLETALK;
756 sa->sat_addr.s_node = ATADDR_ANYNODE;
757 if (dev->flags & IFF_LOOPBACK ||
758 dev->flags & IFF_POINTOPOINT)
759 rtdef.rt_flags |= RTF_HOST;
760
761 /* Routerless initial state */
762 if (nr->nr_firstnet == htons(0) &&
763 nr->nr_lastnet == htons(0xFFFE)) {
764 sa->sat_addr.s_net = atif->address.s_net;
765 atrtr_create(&rtdef, dev);
766 atrtr_set_default(dev);
767 } else {
768 limit = ntohs(nr->nr_lastnet);
769 if (limit - ntohs(nr->nr_firstnet) > 4096) {
770 printk(KERN_WARNING "Too many routes/"
771 "iface.\n");
772 return -EINVAL;
773 }
774 if (add_route)
775 for (ct = ntohs(nr->nr_firstnet);
776 ct <= limit; ct++) {
777 sa->sat_addr.s_net = htons(ct);
778 atrtr_create(&rtdef, dev);
779 }
780 }
781 dev_mc_add(dev, aarp_mcast, 6, 1);
782 return 0;
783
784 case SIOCGIFADDR:
785 if (!atif)
786 return -EADDRNOTAVAIL;
787
788 sa->sat_family = AF_APPLETALK;
789 sa->sat_addr = atif->address;
790 break;
791
792 case SIOCGIFBRDADDR:
793 if (!atif)
794 return -EADDRNOTAVAIL;
795
796 sa->sat_family = AF_APPLETALK;
797 sa->sat_addr.s_net = atif->address.s_net;
798 sa->sat_addr.s_node = ATADDR_BCAST;
799 break;
800
801 case SIOCATALKDIFADDR:
802 case SIOCDIFADDR:
803 if (!capable(CAP_NET_ADMIN))
804 return -EPERM;
805 if (sa->sat_family != AF_APPLETALK)
806 return -EINVAL;
807 atalk_dev_down(dev);
808 break;
809
810 case SIOCSARP:
811 if (!capable(CAP_NET_ADMIN))
812 return -EPERM;
813 if (sa->sat_family != AF_APPLETALK)
814 return -EINVAL;
815 if (!atif)
816 return -EADDRNOTAVAIL;
817
818 /*
819 * for now, we only support proxy AARP on ELAP;
820 * we should be able to do it for LocalTalk, too.
821 */
822 if (dev->type != ARPHRD_ETHER)
823 return -EPROTONOSUPPORT;
824
825 /*
826 * atif points to the current interface on this network;
827 * we aren't concerned about its current status (at
828 * least for now), but it has all the settings about
829 * the network we're going to probe. Consequently, it
830 * must exist.
831 */
832 if (!atif)
833 return -EADDRNOTAVAIL;
834
835 nr = (struct atalk_netrange *)&(atif->nets);
836 /*
837 * Phase 1 is fine on Localtalk but we don't do
838 * Ethertalk phase 1. Anyone wanting to add it go ahead.
839 */
840 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
841 return -EPROTONOSUPPORT;
842
843 if (sa->sat_addr.s_node == ATADDR_BCAST ||
844 sa->sat_addr.s_node == 254)
845 return -EINVAL;
846
847 /*
848 * Check if the chosen address is used. If so we
849 * error and ATCP will try another.
850 */
851 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
852 return -EADDRINUSE;
853
854 /*
855 * We now have an address on the local network, and
856 * the AARP code will defend it for us until we take it
857 * down. We don't set up any routes right now, because
858 * ATCP will install them manually via SIOCADDRT.
859 */
860 break;
861
862 case SIOCDARP:
863 if (!capable(CAP_NET_ADMIN))
864 return -EPERM;
865 if (sa->sat_family != AF_APPLETALK)
866 return -EINVAL;
867 if (!atif)
868 return -EADDRNOTAVAIL;
869
870 /* give to aarp module to remove proxy entry */
871 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
872 return 0;
873 }
874
875 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
876}
877
878/* Routing ioctl() calls */
879static int atrtr_ioctl(unsigned int cmd, void __user *arg)
880{
881 struct rtentry rt;
882
883 if (copy_from_user(&rt, arg, sizeof(rt)))
884 return -EFAULT;
885
886 switch (cmd) {
887 case SIOCDELRT:
888 if (rt.rt_dst.sa_family != AF_APPLETALK)
889 return -EINVAL;
890 return atrtr_delete(&((struct sockaddr_at *)
891 &rt.rt_dst)->sat_addr);
892
893 case SIOCADDRT: {
894 struct net_device *dev = NULL;
895 if (rt.rt_dev) {
896 char name[IFNAMSIZ];
897 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
898 return -EFAULT;
899 name[IFNAMSIZ-1] = '\0';
900 dev = __dev_get_by_name(name);
901 if (!dev)
902 return -ENODEV;
903 }
904 return atrtr_create(&rt, dev);
905 }
906 }
907 return -EINVAL;
908}
909
910/**************************************************************************\
911* *
912* Handling for system calls applied via the various interfaces to an *
913* AppleTalk socket object. *
914* *
915\**************************************************************************/
916
917/*
918 * Checksum: This is 'optional'. It's quite likely also a good
919 * candidate for assembler hackery 8)
920 */
921static unsigned long atalk_sum_partial(const unsigned char *data,
922 int len, unsigned long sum)
923{
924 /* This ought to be unwrapped neatly. I'll trust gcc for now */
925 while (len--) {
926 sum += *data;
927 sum <<= 1;
928 if (sum & 0x10000) {
929 sum++;
930 sum &= 0xffff;
931 }
932 data++;
933 }
934 return sum;
935}
936
937/* Checksum skb data -- similar to skb_checksum */
938static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
939 int len, unsigned long sum)
940{
941 int start = skb_headlen(skb);
942 int i, copy;
943
944 /* checksum stuff in header space */
945 if ( (copy = start - offset) > 0) {
946 if (copy > len)
947 copy = len;
948 sum = atalk_sum_partial(skb->data + offset, copy, sum);
949 if ( (len -= copy) == 0)
950 return sum;
951
952 offset += copy;
953 }
954
955 /* checksum stuff in frags */
956 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
957 int end;
958
959 BUG_TRAP(start <= offset + len);
960
961 end = start + skb_shinfo(skb)->frags[i].size;
962 if ((copy = end - offset) > 0) {
963 u8 *vaddr;
964 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
965
966 if (copy > len)
967 copy = len;
968 vaddr = kmap_skb_frag(frag);
969 sum = atalk_sum_partial(vaddr + frag->page_offset +
970 offset - start, copy, sum);
971 kunmap_skb_frag(vaddr);
972
973 if (!(len -= copy))
974 return sum;
975 offset += copy;
976 }
977 start = end;
978 }
979
980 if (skb_shinfo(skb)->frag_list) {
981 struct sk_buff *list = skb_shinfo(skb)->frag_list;
982
983 for (; list; list = list->next) {
984 int end;
985
986 BUG_TRAP(start <= offset + len);
987
988 end = start + list->len;
989 if ((copy = end - offset) > 0) {
990 if (copy > len)
991 copy = len;
992 sum = atalk_sum_skb(list, offset - start,
993 copy, sum);
994 if ((len -= copy) == 0)
995 return sum;
996 offset += copy;
997 }
998 start = end;
999 }
1000 }
1001
1002 BUG_ON(len > 0);
1003
1004 return sum;
1005}
1006
1007static unsigned short atalk_checksum(const struct sk_buff *skb, int len)
1008{
1009 unsigned long sum;
1010
1011 /* skip header 4 bytes */
1012 sum = atalk_sum_skb(skb, 4, len-4, 0);
1013
1014 /* Use 0xFFFF for 0. 0 itself means none */
1015 return sum ? htons((unsigned short)sum) : 0xFFFF;
1016}
1017
1018static struct proto ddp_proto = {
1019 .name = "DDP",
1020 .owner = THIS_MODULE,
1021 .obj_size = sizeof(struct atalk_sock),
1022};
1023
1024/*
1025 * Create a socket. Initialise the socket, blank the addresses
1026 * set the state.
1027 */
1028static int atalk_create(struct socket *sock, int protocol)
1029{
1030 struct sock *sk;
1031 int rc = -ESOCKTNOSUPPORT;
1032
1033 /*
1034 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1035 * and gives you the full ELAP frame. Should be handy for CAP 8)
1036 */
1037 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1038 goto out;
1039 rc = -ENOMEM;
1040 sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1);
1041 if (!sk)
1042 goto out;
1043 rc = 0;
1044 sock->ops = &atalk_dgram_ops;
1045 sock_init_data(sock, sk);
1046
1047 /* Checksums on by default */
1048 sock_set_flag(sk, SOCK_ZAPPED);
1049out:
1050 return rc;
1051}
1052
1053/* Free a socket. No work needed */
1054static int atalk_release(struct socket *sock)
1055{
1056 struct sock *sk = sock->sk;
1057
1058 if (sk) {
1059 sock_orphan(sk);
1060 sock->sk = NULL;
1061 atalk_destroy_socket(sk);
1062 }
1063 return 0;
1064}
1065
1066/**
1067 * atalk_pick_and_bind_port - Pick a source port when one is not given
1068 * @sk - socket to insert into the tables
1069 * @sat - address to search for
1070 *
1071 * Pick a source port when one is not given. If we can find a suitable free
1072 * one, we insert the socket into the tables using it.
1073 *
1074 * This whole operation must be atomic.
1075 */
1076static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1077{
1078 int retval;
1079
1080 write_lock_bh(&atalk_sockets_lock);
1081
1082 for (sat->sat_port = ATPORT_RESERVED;
1083 sat->sat_port < ATPORT_LAST;
1084 sat->sat_port++) {
1085 struct sock *s;
1086 struct hlist_node *node;
1087
1088 sk_for_each(s, node, &atalk_sockets) {
1089 struct atalk_sock *at = at_sk(s);
1090
1091 if (at->src_net == sat->sat_addr.s_net &&
1092 at->src_node == sat->sat_addr.s_node &&
1093 at->src_port == sat->sat_port)
1094 goto try_next_port;
1095 }
1096
1097 /* Wheee, it's free, assign and insert. */
1098 __atalk_insert_socket(sk);
1099 at_sk(sk)->src_port = sat->sat_port;
1100 retval = 0;
1101 goto out;
1102
1103try_next_port:;
1104 }
1105
1106 retval = -EBUSY;
1107out:
1108 write_unlock_bh(&atalk_sockets_lock);
1109 return retval;
1110}
1111
1112static int atalk_autobind(struct sock *sk)
1113{
1114 struct atalk_sock *at = at_sk(sk);
1115 struct sockaddr_at sat;
1116 struct atalk_addr *ap = atalk_find_primary();
1117 int n = -EADDRNOTAVAIL;
1118
1119 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1120 goto out;
1121
1122 at->src_net = sat.sat_addr.s_net = ap->s_net;
1123 at->src_node = sat.sat_addr.s_node = ap->s_node;
1124
1125 n = atalk_pick_and_bind_port(sk, &sat);
1126 if (!n)
1127 sock_reset_flag(sk, SOCK_ZAPPED);
1128out:
1129 return n;
1130}
1131
1132/* Set the address 'our end' of the connection */
1133static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1134{
1135 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1136 struct sock *sk = sock->sk;
1137 struct atalk_sock *at = at_sk(sk);
1138
1139 if (!sock_flag(sk, SOCK_ZAPPED) ||
1140 addr_len != sizeof(struct sockaddr_at))
1141 return -EINVAL;
1142
1143 if (addr->sat_family != AF_APPLETALK)
1144 return -EAFNOSUPPORT;
1145
1146 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1147 struct atalk_addr *ap = atalk_find_primary();
1148
1149 if (!ap)
1150 return -EADDRNOTAVAIL;
1151
1152 at->src_net = addr->sat_addr.s_net = ap->s_net;
1153 at->src_node = addr->sat_addr.s_node= ap->s_node;
1154 } else {
1155 if (!atalk_find_interface(addr->sat_addr.s_net,
1156 addr->sat_addr.s_node))
1157 return -EADDRNOTAVAIL;
1158
1159 at->src_net = addr->sat_addr.s_net;
1160 at->src_node = addr->sat_addr.s_node;
1161 }
1162
1163 if (addr->sat_port == ATADDR_ANYPORT) {
1164 int n = atalk_pick_and_bind_port(sk, addr);
1165
1166 if (n < 0)
1167 return n;
1168 } else {
1169 at->src_port = addr->sat_port;
1170
1171 if (atalk_find_or_insert_socket(sk, addr))
1172 return -EADDRINUSE;
1173 }
1174
1175 sock_reset_flag(sk, SOCK_ZAPPED);
1176 return 0;
1177}
1178
1179/* Set the address we talk to */
1180static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1181 int addr_len, int flags)
1182{
1183 struct sock *sk = sock->sk;
1184 struct atalk_sock *at = at_sk(sk);
1185 struct sockaddr_at *addr;
1186
1187 sk->sk_state = TCP_CLOSE;
1188 sock->state = SS_UNCONNECTED;
1189
1190 if (addr_len != sizeof(*addr))
1191 return -EINVAL;
1192
1193 addr = (struct sockaddr_at *)uaddr;
1194
1195 if (addr->sat_family != AF_APPLETALK)
1196 return -EAFNOSUPPORT;
1197
1198 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1199 !sock_flag(sk, SOCK_BROADCAST)) {
1200#if 1
1201 printk(KERN_WARNING "%s is broken and did not set "
1202 "SO_BROADCAST. It will break when 2.2 is "
1203 "released.\n",
1204 current->comm);
1205#else
1206 return -EACCES;
1207#endif
1208 }
1209
1210 if (sock_flag(sk, SOCK_ZAPPED))
1211 if (atalk_autobind(sk) < 0)
1212 return -EBUSY;
1213
1214 if (!atrtr_get_dev(&addr->sat_addr))
1215 return -ENETUNREACH;
1216
1217 at->dest_port = addr->sat_port;
1218 at->dest_net = addr->sat_addr.s_net;
1219 at->dest_node = addr->sat_addr.s_node;
1220
1221 sock->state = SS_CONNECTED;
1222 sk->sk_state = TCP_ESTABLISHED;
1223 return 0;
1224}
1225
1226/*
1227 * Find the name of an AppleTalk socket. Just copy the right
1228 * fields into the sockaddr.
1229 */
1230static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1231 int *uaddr_len, int peer)
1232{
1233 struct sockaddr_at sat;
1234 struct sock *sk = sock->sk;
1235 struct atalk_sock *at = at_sk(sk);
1236
1237 if (sock_flag(sk, SOCK_ZAPPED))
1238 if (atalk_autobind(sk) < 0)
1239 return -ENOBUFS;
1240
1241 *uaddr_len = sizeof(struct sockaddr_at);
1242
1243 if (peer) {
1244 if (sk->sk_state != TCP_ESTABLISHED)
1245 return -ENOTCONN;
1246
1247 sat.sat_addr.s_net = at->dest_net;
1248 sat.sat_addr.s_node = at->dest_node;
1249 sat.sat_port = at->dest_port;
1250 } else {
1251 sat.sat_addr.s_net = at->src_net;
1252 sat.sat_addr.s_node = at->src_node;
1253 sat.sat_port = at->src_port;
1254 }
1255
1256 sat.sat_family = AF_APPLETALK;
1257 memcpy(uaddr, &sat, sizeof(sat));
1258 return 0;
1259}
1260
1261#if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1262static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1263{
1264 return skb->data[12] == 22;
1265}
1266
1267static int handle_ip_over_ddp(struct sk_buff *skb)
1268{
1269 struct net_device *dev = __dev_get_by_name("ipddp0");
1270 struct net_device_stats *stats;
1271
1272 /* This needs to be able to handle ipddp"N" devices */
1273 if (!dev)
1274 return -ENODEV;
1275
1276 skb->protocol = htons(ETH_P_IP);
1277 skb_pull(skb, 13);
1278 skb->dev = dev;
1279 skb->h.raw = skb->data;
1280
1281 stats = dev->priv;
1282 stats->rx_packets++;
1283 stats->rx_bytes += skb->len + 13;
1284 netif_rx(skb); /* Send the SKB up to a higher place. */
1285 return 0;
1286}
1287#else
1288/* make it easy for gcc to optimize this test out, i.e. kill the code */
1289#define is_ip_over_ddp(skb) 0
1290#define handle_ip_over_ddp(skb) 0
1291#endif
1292
1293static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1294 struct ddpehdr *ddp, struct ddpebits *ddphv,
1295 int origlen)
1296{
1297 struct atalk_route *rt;
1298 struct atalk_addr ta;
1299
1300 /*
1301 * Don't route multicast, etc., packets, or packets sent to "this
1302 * network"
1303 */
1304 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1305 /*
1306 * FIXME:
1307 *
1308 * Can it ever happen that a packet is from a PPP iface and
1309 * needs to be broadcast onto the default network?
1310 */
1311 if (dev->type == ARPHRD_PPP)
1312 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1313 "packet received from PPP iface\n");
1314 goto free_it;
1315 }
1316
1317 ta.s_net = ddp->deh_dnet;
1318 ta.s_node = ddp->deh_dnode;
1319
1320 /* Route the packet */
1321 rt = atrtr_find(&ta);
1322 if (!rt || ddphv->deh_hops == DDP_MAXHOPS)
1323 goto free_it;
1324 /* FIXME: use skb->cb to be able to use shared skbs */
1325 ddphv->deh_hops++;
1326
1327 /*
1328 * Route goes through another gateway, so set the target to the
1329 * gateway instead.
1330 */
1331
1332 if (rt->flags & RTF_GATEWAY) {
1333 ta.s_net = rt->gateway.s_net;
1334 ta.s_node = rt->gateway.s_node;
1335 }
1336
1337 /* Fix up skb->len field */
1338 skb_trim(skb, min_t(unsigned int, origlen,
1339 (rt->dev->hard_header_len +
1340 ddp_dl->header_length + ddphv->deh_len)));
1341
1342 /* Mend the byte order */
1343 /* FIXME: use skb->cb to be able to use shared skbs */
1344 *((__u16 *)ddp) = ntohs(*((__u16 *)ddphv));
1345
1346 /*
1347 * Send the buffer onwards
1348 *
1349 * Now we must always be careful. If it's come from LocalTalk to
1350 * EtherTalk it might not fit
1351 *
1352 * Order matters here: If a packet has to be copied to make a new
1353 * headroom (rare hopefully) then it won't need unsharing.
1354 *
1355 * Note. ddp-> becomes invalid at the realloc.
1356 */
1357 if (skb_headroom(skb) < 22) {
1358 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1359 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1360 kfree_skb(skb);
1361 if (!nskb)
1362 goto out;
1363 skb = nskb;
1364 } else
1365 skb = skb_unshare(skb, GFP_ATOMIC);
1366
1367 /*
1368 * If the buffer didn't vanish into the lack of space bitbucket we can
1369 * send it.
1370 */
1371 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1372 goto free_it;
1373out:
1374 return;
1375free_it:
1376 kfree_skb(skb);
1377}
1378
1379/**
1380 * atalk_rcv - Receive a packet (in skb) from device dev
1381 * @skb - packet received
1382 * @dev - network device where the packet comes from
1383 * @pt - packet type
1384 *
1385 * Receive a packet (in skb) from device dev. This has come from the SNAP
1386 * decoder, and on entry skb->h.raw is the DDP header, skb->len is the DDP
1387 * header, skb->len is the DDP length. The physical headers have been
1388 * extracted. PPP should probably pass frames marked as for this layer.
1389 * [ie ARPHRD_ETHERTALK]
1390 */
1391static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1392 struct packet_type *pt)
1393{
1394 struct ddpehdr *ddp;
1395 struct sock *sock;
1396 struct atalk_iface *atif;
1397 struct sockaddr_at tosat;
1398 int origlen;
1399 struct ddpebits ddphv;
1400
1401 /* Don't mangle buffer if shared */
1402 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1403 goto out;
1404
1405 /* Size check and make sure header is contiguous */
1406 if (!pskb_may_pull(skb, sizeof(*ddp)))
1407 goto freeit;
1408
1409 ddp = ddp_hdr(skb);
1410
1411 /*
1412 * Fix up the length field [Ok this is horrible but otherwise
1413 * I end up with unions of bit fields and messy bit field order
1414 * compiler/endian dependencies..]
1415 */
1416 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1417
1418 /* Trim buffer in case of stray trailing data */
1419 origlen = skb->len;
1420 skb_trim(skb, min_t(unsigned int, skb->len, ddphv.deh_len));
1421
1422 /*
1423 * Size check to see if ddp->deh_len was crap
1424 * (Otherwise we'll detonate most spectacularly
1425 * in the middle of recvmsg()).
1426 */
1427 if (skb->len < sizeof(*ddp))
1428 goto freeit;
1429
1430 /*
1431 * Any checksums. Note we don't do htons() on this == is assumed to be
1432 * valid for net byte orders all over the networking code...
1433 */
1434 if (ddp->deh_sum &&
1435 atalk_checksum(skb, ddphv.deh_len) != ddp->deh_sum)
1436 /* Not a valid AppleTalk frame - dustbin time */
1437 goto freeit;
1438
1439 /* Check the packet is aimed at us */
1440 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1441 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1442 else
1443 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1444
1445 /* Not ours, so we route the packet via the correct AppleTalk iface */
1446 if (!atif) {
1447 atalk_route_packet(skb, dev, ddp, &ddphv, origlen);
1448 goto out;
1449 }
1450
1451 /* if IP over DDP is not selected this code will be optimized out */
1452 if (is_ip_over_ddp(skb))
1453 return handle_ip_over_ddp(skb);
1454 /*
1455 * Which socket - atalk_search_socket() looks for a *full match*
1456 * of the <net, node, port> tuple.
1457 */
1458 tosat.sat_addr.s_net = ddp->deh_dnet;
1459 tosat.sat_addr.s_node = ddp->deh_dnode;
1460 tosat.sat_port = ddp->deh_dport;
1461
1462 sock = atalk_search_socket(&tosat, atif);
1463 if (!sock) /* But not one of our sockets */
1464 goto freeit;
1465
1466 /* Queue packet (standard) */
1467 skb->sk = sock;
1468
1469 if (sock_queue_rcv_skb(sock, skb) < 0)
1470 goto freeit;
1471out:
1472 return 0;
1473freeit:
1474 kfree_skb(skb);
1475 goto out;
1476}
1477
1478/*
1479 * Receive a LocalTalk frame. We make some demands on the caller here.
1480 * Caller must provide enough headroom on the packet to pull the short
1481 * header and append a long one.
1482 */
1483static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1484 struct packet_type *pt)
1485{
1486 /* Expand any short form frames */
1487 if (skb->mac.raw[2] == 1) {
1488 struct ddpehdr *ddp;
1489 /* Find our address */
1490 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1491
1492 if (!ap || skb->len < sizeof(struct ddpshdr))
1493 goto freeit;
1494
1495 /* Don't mangle buffer if shared */
1496 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1497 return 0;
1498
1499 /*
1500 * The push leaves us with a ddephdr not an shdr, and
1501 * handily the port bytes in the right place preset.
1502 */
1503 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1504
1505 /* Now fill in the long header */
1506
1507 /*
1508 * These two first. The mac overlays the new source/dest
1509 * network information so we MUST copy these before
1510 * we write the network numbers !
1511 */
1512
1513 ddp->deh_dnode = skb->mac.raw[0]; /* From physical header */
1514 ddp->deh_snode = skb->mac.raw[1]; /* From physical header */
1515
1516 ddp->deh_dnet = ap->s_net; /* Network number */
1517 ddp->deh_snet = ap->s_net;
1518 ddp->deh_sum = 0; /* No checksum */
1519 /*
1520 * Not sure about this bit...
1521 */
1522 ddp->deh_len = skb->len;
1523 ddp->deh_hops = DDP_MAXHOPS; /* Non routable, so force a drop
1524 if we slip up later */
1525 /* Mend the byte order */
1526 *((__u16 *)ddp) = htons(*((__u16 *)ddp));
1527 }
1528 skb->h.raw = skb->data;
1529
1530 return atalk_rcv(skb, dev, pt);
1531freeit:
1532 kfree_skb(skb);
1533 return 0;
1534}
1535
1536static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1537 size_t len)
1538{
1539 struct sock *sk = sock->sk;
1540 struct atalk_sock *at = at_sk(sk);
1541 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1542 int flags = msg->msg_flags;
1543 int loopback = 0;
1544 struct sockaddr_at local_satalk, gsat;
1545 struct sk_buff *skb;
1546 struct net_device *dev;
1547 struct ddpehdr *ddp;
1548 int size;
1549 struct atalk_route *rt;
1550 int err;
1551
1552 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1553 return -EINVAL;
1554
1555 if (len > DDP_MAXSZ)
1556 return -EMSGSIZE;
1557
1558 if (usat) {
1559 if (sock_flag(sk, SOCK_ZAPPED))
1560 if (atalk_autobind(sk) < 0)
1561 return -EBUSY;
1562
1563 if (msg->msg_namelen < sizeof(*usat) ||
1564 usat->sat_family != AF_APPLETALK)
1565 return -EINVAL;
1566
1567 /* netatalk doesn't implement this check */
1568 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1569 !sock_flag(sk, SOCK_BROADCAST)) {
1570 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1571 "it will break before 2.2\n");
1572#if 0
1573 return -EPERM;
1574#endif
1575 }
1576 } else {
1577 if (sk->sk_state != TCP_ESTABLISHED)
1578 return -ENOTCONN;
1579 usat = &local_satalk;
1580 usat->sat_family = AF_APPLETALK;
1581 usat->sat_port = at->dest_port;
1582 usat->sat_addr.s_node = at->dest_node;
1583 usat->sat_addr.s_net = at->dest_net;
1584 }
1585
1586 /* Build a packet */
1587 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1588
1589 /* For headers */
1590 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1591
1592 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1593 rt = atrtr_find(&usat->sat_addr);
1594 if (!rt)
1595 return -ENETUNREACH;
1596
1597 dev = rt->dev;
1598 } else {
1599 struct atalk_addr at_hint;
1600
1601 at_hint.s_node = 0;
1602 at_hint.s_net = at->src_net;
1603
1604 rt = atrtr_find(&at_hint);
1605 if (!rt)
1606 return -ENETUNREACH;
1607
1608 dev = rt->dev;
1609 }
1610
1611 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1612 sk, size, dev->name);
1613
1614 size += dev->hard_header_len;
1615 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1616 if (!skb)
1617 return err;
1618
1619 skb->sk = sk;
1620 skb_reserve(skb, ddp_dl->header_length);
1621 skb_reserve(skb, dev->hard_header_len);
1622 skb->dev = dev;
1623
1624 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1625
1626 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1627 ddp->deh_pad = 0;
1628 ddp->deh_hops = 0;
1629 ddp->deh_len = len + sizeof(*ddp);
1630 /*
1631 * Fix up the length field [Ok this is horrible but otherwise
1632 * I end up with unions of bit fields and messy bit field order
1633 * compiler/endian dependencies..
1634 */
1635 *((__u16 *)ddp) = ntohs(*((__u16 *)ddp));
1636
1637 ddp->deh_dnet = usat->sat_addr.s_net;
1638 ddp->deh_snet = at->src_net;
1639 ddp->deh_dnode = usat->sat_addr.s_node;
1640 ddp->deh_snode = at->src_node;
1641 ddp->deh_dport = usat->sat_port;
1642 ddp->deh_sport = at->src_port;
1643
1644 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1645
1646 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1647 if (err) {
1648 kfree_skb(skb);
1649 return -EFAULT;
1650 }
1651
1652 if (sk->sk_no_check == 1)
1653 ddp->deh_sum = 0;
1654 else
1655 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1656
1657 /*
1658 * Loopback broadcast packets to non gateway targets (ie routes
1659 * to group we are in)
1660 */
1661 if (ddp->deh_dnode == ATADDR_BCAST &&
1662 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1663 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1664
1665 if (skb2) {
1666 loopback = 1;
1667 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1668 if (aarp_send_ddp(dev, skb2,
1669 &usat->sat_addr, NULL) == -1)
1670 kfree_skb(skb2);
1671 /* else queued/sent above in the aarp queue */
1672 }
1673 }
1674
1675 if (dev->flags & IFF_LOOPBACK || loopback) {
1676 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1677 /* loop back */
1678 skb_orphan(skb);
1679 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1680 } else {
1681 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1682 if (rt->flags & RTF_GATEWAY) {
1683 gsat.sat_addr = rt->gateway;
1684 usat = &gsat;
1685 }
1686
1687 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1688 kfree_skb(skb);
1689 /* else queued/sent above in the aarp queue */
1690 }
1691 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1692
1693 return len;
1694}
1695
1696static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1697 size_t size, int flags)
1698{
1699 struct sock *sk = sock->sk;
1700 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1701 struct ddpehdr *ddp;
1702 int copied = 0;
1703 int err = 0;
1704 struct ddpebits ddphv;
1705 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1706 flags & MSG_DONTWAIT, &err);
1707 if (!skb)
1708 return err;
1709
1710 /* FIXME: use skb->cb to be able to use shared skbs */
1711 ddp = ddp_hdr(skb);
1712 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1713
1714 if (sk->sk_type == SOCK_RAW) {
1715 copied = ddphv.deh_len;
1716 if (copied > size) {
1717 copied = size;
1718 msg->msg_flags |= MSG_TRUNC;
1719 }
1720
1721 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1722 } else {
1723 copied = ddphv.deh_len - sizeof(*ddp);
1724 if (copied > size) {
1725 copied = size;
1726 msg->msg_flags |= MSG_TRUNC;
1727 }
1728 err = skb_copy_datagram_iovec(skb, sizeof(*ddp),
1729 msg->msg_iov, copied);
1730 }
1731
1732 if (!err) {
1733 if (sat) {
1734 sat->sat_family = AF_APPLETALK;
1735 sat->sat_port = ddp->deh_sport;
1736 sat->sat_addr.s_node = ddp->deh_snode;
1737 sat->sat_addr.s_net = ddp->deh_snet;
1738 }
1739 msg->msg_namelen = sizeof(*sat);
1740 }
1741
1742 skb_free_datagram(sk, skb); /* Free the datagram. */
1743 return err ? : copied;
1744}
1745
1746
1747/*
1748 * AppleTalk ioctl calls.
1749 */
1750static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1751{
1752 int rc = -EINVAL;
1753 struct sock *sk = sock->sk;
1754 void __user *argp = (void __user *)arg;
1755
1756 switch (cmd) {
1757 /* Protocol layer */
1758 case TIOCOUTQ: {
1759 long amount = sk->sk_sndbuf -
1760 atomic_read(&sk->sk_wmem_alloc);
1761
1762 if (amount < 0)
1763 amount = 0;
1764 rc = put_user(amount, (int __user *)argp);
1765 break;
1766 }
1767 case TIOCINQ: {
1768 /*
1769 * These two are safe on a single CPU system as only
1770 * user tasks fiddle here
1771 */
1772 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1773 long amount = 0;
1774
1775 if (skb)
1776 amount = skb->len - sizeof(struct ddpehdr);
1777 rc = put_user(amount, (int __user *)argp);
1778 break;
1779 }
1780 case SIOCGSTAMP:
1781 rc = sock_get_timestamp(sk, argp);
1782 break;
1783 /* Routing */
1784 case SIOCADDRT:
1785 case SIOCDELRT:
1786 rc = -EPERM;
1787 if (capable(CAP_NET_ADMIN))
1788 rc = atrtr_ioctl(cmd, argp);
1789 break;
1790 /* Interface */
1791 case SIOCGIFADDR:
1792 case SIOCSIFADDR:
1793 case SIOCGIFBRDADDR:
1794 case SIOCATALKDIFADDR:
1795 case SIOCDIFADDR:
1796 case SIOCSARP: /* proxy AARP */
1797 case SIOCDARP: /* proxy AARP */
1798 rtnl_lock();
1799 rc = atif_ioctl(cmd, argp);
1800 rtnl_unlock();
1801 break;
1802 /* Physical layer ioctl calls */
1803 case SIOCSIFLINK:
1804 case SIOCGIFHWADDR:
1805 case SIOCSIFHWADDR:
1806 case SIOCGIFFLAGS:
1807 case SIOCSIFFLAGS:
1808 case SIOCGIFTXQLEN:
1809 case SIOCSIFTXQLEN:
1810 case SIOCGIFMTU:
1811 case SIOCGIFCONF:
1812 case SIOCADDMULTI:
1813 case SIOCDELMULTI:
1814 case SIOCGIFCOUNT:
1815 case SIOCGIFINDEX:
1816 case SIOCGIFNAME:
1817 rc = dev_ioctl(cmd, argp);
1818 break;
1819 }
1820
1821 return rc;
1822}
1823
1824static struct net_proto_family atalk_family_ops = {
1825 .family = PF_APPLETALK,
1826 .create = atalk_create,
1827 .owner = THIS_MODULE,
1828};
1829
1830static struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1831 .family = PF_APPLETALK,
1832 .owner = THIS_MODULE,
1833 .release = atalk_release,
1834 .bind = atalk_bind,
1835 .connect = atalk_connect,
1836 .socketpair = sock_no_socketpair,
1837 .accept = sock_no_accept,
1838 .getname = atalk_getname,
1839 .poll = datagram_poll,
1840 .ioctl = atalk_ioctl,
1841 .listen = sock_no_listen,
1842 .shutdown = sock_no_shutdown,
1843 .setsockopt = sock_no_setsockopt,
1844 .getsockopt = sock_no_getsockopt,
1845 .sendmsg = atalk_sendmsg,
1846 .recvmsg = atalk_recvmsg,
1847 .mmap = sock_no_mmap,
1848 .sendpage = sock_no_sendpage,
1849};
1850
1851#include <linux/smp_lock.h>
1852SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1853
1854static struct notifier_block ddp_notifier = {
1855 .notifier_call = ddp_device_event,
1856};
1857
1858static struct packet_type ltalk_packet_type = {
1859 .type = __constant_htons(ETH_P_LOCALTALK),
1860 .func = ltalk_rcv,
1861};
1862
1863static struct packet_type ppptalk_packet_type = {
1864 .type = __constant_htons(ETH_P_PPPTALK),
1865 .func = atalk_rcv,
1866};
1867
1868static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1869
1870/* Export symbols for use by drivers when AppleTalk is a module */
1871EXPORT_SYMBOL(aarp_send_ddp);
1872EXPORT_SYMBOL(atrtr_get_dev);
1873EXPORT_SYMBOL(atalk_find_dev_addr);
1874
1875static char atalk_err_snap[] __initdata =
1876 KERN_CRIT "Unable to register DDP with SNAP.\n";
1877
1878/* Called by proto.c on kernel start up */
1879static int __init atalk_init(void)
1880{
1881 int rc = proto_register(&ddp_proto, 0);
1882
1883 if (rc != 0)
1884 goto out;
1885
1886 (void)sock_register(&atalk_family_ops);
1887 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1888 if (!ddp_dl)
1889 printk(atalk_err_snap);
1890
1891 dev_add_pack(&ltalk_packet_type);
1892 dev_add_pack(&ppptalk_packet_type);
1893
1894 register_netdevice_notifier(&ddp_notifier);
1895 aarp_proto_init();
1896 atalk_proc_init();
1897 atalk_register_sysctl();
1898out:
1899 return rc;
1900}
1901module_init(atalk_init);
1902
1903/*
1904 * No explicit module reference count manipulation is needed in the
1905 * protocol. Socket layer sets module reference count for us
1906 * and interfaces reference counting is done
1907 * by the network device layer.
1908 *
1909 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1910 * sockets be closed from user space.
1911 */
1912static void __exit atalk_exit(void)
1913{
1914#ifdef CONFIG_SYSCTL
1915 atalk_unregister_sysctl();
1916#endif /* CONFIG_SYSCTL */
1917 atalk_proc_exit();
1918 aarp_cleanup_module(); /* General aarp clean-up. */
1919 unregister_netdevice_notifier(&ddp_notifier);
1920 dev_remove_pack(&ltalk_packet_type);
1921 dev_remove_pack(&ppptalk_packet_type);
1922 unregister_snap_client(ddp_dl);
1923 sock_unregister(PF_APPLETALK);
1924 proto_unregister(&ddp_proto);
1925}
1926module_exit(atalk_exit);
1927
1928MODULE_LICENSE("GPL");
1929MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1930MODULE_DESCRIPTION("AppleTalk 0.20\n");
1931MODULE_ALIAS_NETPROTO(PF_APPLETALK);
diff --git a/net/appletalk/dev.c b/net/appletalk/dev.c
new file mode 100644
index 00000000000..76598445d84
--- /dev/null
+++ b/net/appletalk/dev.c
@@ -0,0 +1,43 @@
1/*
2 * Moved here from drivers/net/net_init.c, which is:
3 * Written 1993,1994,1995 by Donald Becker.
4 */
5
6#include <linux/errno.h>
7#include <linux/module.h>
8#include <linux/netdevice.h>
9#include <linux/if_arp.h>
10#include <linux/if_ltalk.h>
11
12static int ltalk_change_mtu(struct net_device *dev, int mtu)
13{
14 return -EINVAL;
15}
16
17static int ltalk_mac_addr(struct net_device *dev, void *addr)
18{
19 return -EINVAL;
20}
21
22void ltalk_setup(struct net_device *dev)
23{
24 /* Fill in the fields of the device structure with localtalk-generic values. */
25
26 dev->change_mtu = ltalk_change_mtu;
27 dev->hard_header = NULL;
28 dev->rebuild_header = NULL;
29 dev->set_mac_address = ltalk_mac_addr;
30 dev->hard_header_cache = NULL;
31 dev->header_cache_update= NULL;
32
33 dev->type = ARPHRD_LOCALTLK;
34 dev->hard_header_len = LTALK_HLEN;
35 dev->mtu = LTALK_MTU;
36 dev->addr_len = LTALK_ALEN;
37 dev->tx_queue_len = 10;
38
39 dev->broadcast[0] = 0xFF;
40
41 dev->flags = IFF_BROADCAST|IFF_MULTICAST|IFF_NOARP;
42}
43EXPORT_SYMBOL(ltalk_setup);
diff --git a/net/appletalk/sysctl_net_atalk.c b/net/appletalk/sysctl_net_atalk.c
new file mode 100644
index 00000000000..af7f0604395
--- /dev/null
+++ b/net/appletalk/sysctl_net_atalk.c
@@ -0,0 +1,83 @@
1/*
2 * sysctl_net_atalk.c: sysctl interface to net AppleTalk subsystem.
3 *
4 * Begun April 1, 1996, Mike Shaver.
5 * Added /proc/sys/net/atalk directory entry (empty =) ). [MS]
6 * Dynamic registration, added aarp entries. (5/30/97 Chris Horn)
7 */
8
9#include <linux/config.h>
10#include <linux/sysctl.h>
11#include <net/sock.h>
12#include <linux/atalk.h>
13
14static struct ctl_table atalk_table[] = {
15 {
16 .ctl_name = NET_ATALK_AARP_EXPIRY_TIME,
17 .procname = "aarp-expiry-time",
18 .data = &sysctl_aarp_expiry_time,
19 .maxlen = sizeof(int),
20 .mode = 0644,
21 .proc_handler = &proc_dointvec_jiffies,
22 .strategy = &sysctl_jiffies,
23 },
24 {
25 .ctl_name = NET_ATALK_AARP_TICK_TIME,
26 .procname = "aarp-tick-time",
27 .data = &sysctl_aarp_tick_time,
28 .maxlen = sizeof(int),
29 .mode = 0644,
30 .proc_handler = &proc_dointvec_jiffies,
31 .strategy = &sysctl_jiffies,
32 },
33 {
34 .ctl_name = NET_ATALK_AARP_RETRANSMIT_LIMIT,
35 .procname = "aarp-retransmit-limit",
36 .data = &sysctl_aarp_retransmit_limit,
37 .maxlen = sizeof(int),
38 .mode = 0644,
39 .proc_handler = &proc_dointvec,
40 },
41 {
42 .ctl_name = NET_ATALK_AARP_RESOLVE_TIME,
43 .procname = "aarp-resolve-time",
44 .data = &sysctl_aarp_resolve_time,
45 .maxlen = sizeof(int),
46 .mode = 0644,
47 .proc_handler = &proc_dointvec_jiffies,
48 .strategy = &sysctl_jiffies,
49 },
50 { 0 },
51};
52
53static struct ctl_table atalk_dir_table[] = {
54 {
55 .ctl_name = NET_ATALK,
56 .procname = "appletalk",
57 .mode = 0555,
58 .child = atalk_table,
59 },
60 { 0 },
61};
62
63static struct ctl_table atalk_root_table[] = {
64 {
65 .ctl_name = CTL_NET,
66 .procname = "net",
67 .mode = 0555,
68 .child = atalk_dir_table,
69 },
70 { 0 },
71};
72
73static struct ctl_table_header *atalk_table_header;
74
75void atalk_register_sysctl(void)
76{
77 atalk_table_header = register_sysctl_table(atalk_root_table, 1);
78}
79
80void atalk_unregister_sysctl(void)
81{
82 unregister_sysctl_table(atalk_table_header);
83}
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-09 00:08:39 -0500