diff options
Diffstat (limited to 'drivers/staging/appletalk/ddp.c')
-rw-r--r-- | drivers/staging/appletalk/ddp.c | 1981 |
1 files changed, 1981 insertions, 0 deletions
diff --git a/drivers/staging/appletalk/ddp.c b/drivers/staging/appletalk/ddp.c new file mode 100644 index 00000000000..940dd190833 --- /dev/null +++ b/drivers/staging/appletalk/ddp.c | |||
@@ -0,0 +1,1981 @@ | |||
1 | /* | ||
2 | * DDP: An implementation of the AppleTalk DDP protocol for | ||
3 | * Ethernet 'ELAP'. | ||
4 | * | ||
5 | * Alan Cox <alan@lxorguk.ukuu.org.uk> | ||
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/capability.h> | ||
55 | #include <linux/module.h> | ||
56 | #include <linux/if_arp.h> | ||
57 | #include <linux/smp_lock.h> | ||
58 | #include <linux/termios.h> /* For TIOCOUTQ/INQ */ | ||
59 | #include <linux/compat.h> | ||
60 | #include <linux/slab.h> | ||
61 | #include <net/datalink.h> | ||
62 | #include <net/psnap.h> | ||
63 | #include <net/sock.h> | ||
64 | #include <net/tcp_states.h> | ||
65 | #include <net/route.h> | ||
66 | #include "atalk.h" | ||
67 | #include "../../net/core/kmap_skb.h" | ||
68 | |||
69 | struct datalink_proto *ddp_dl, *aarp_dl; | ||
70 | static const struct proto_ops atalk_dgram_ops; | ||
71 | |||
72 | /**************************************************************************\ | ||
73 | * * | ||
74 | * Handlers for the socket list. * | ||
75 | * * | ||
76 | \**************************************************************************/ | ||
77 | |||
78 | HLIST_HEAD(atalk_sockets); | ||
79 | DEFINE_RWLOCK(atalk_sockets_lock); | ||
80 | |||
81 | static inline void __atalk_insert_socket(struct sock *sk) | ||
82 | { | ||
83 | sk_add_node(sk, &atalk_sockets); | ||
84 | } | ||
85 | |||
86 | static inline void atalk_remove_socket(struct sock *sk) | ||
87 | { | ||
88 | write_lock_bh(&atalk_sockets_lock); | ||
89 | sk_del_node_init(sk); | ||
90 | write_unlock_bh(&atalk_sockets_lock); | ||
91 | } | ||
92 | |||
93 | static struct sock *atalk_search_socket(struct sockaddr_at *to, | ||
94 | struct atalk_iface *atif) | ||
95 | { | ||
96 | struct sock *s; | ||
97 | struct hlist_node *node; | ||
98 | |||
99 | read_lock_bh(&atalk_sockets_lock); | ||
100 | sk_for_each(s, node, &atalk_sockets) { | ||
101 | struct atalk_sock *at = at_sk(s); | ||
102 | |||
103 | if (to->sat_port != at->src_port) | ||
104 | continue; | ||
105 | |||
106 | if (to->sat_addr.s_net == ATADDR_ANYNET && | ||
107 | to->sat_addr.s_node == ATADDR_BCAST) | ||
108 | goto found; | ||
109 | |||
110 | if (to->sat_addr.s_net == at->src_net && | ||
111 | (to->sat_addr.s_node == at->src_node || | ||
112 | to->sat_addr.s_node == ATADDR_BCAST || | ||
113 | to->sat_addr.s_node == ATADDR_ANYNODE)) | ||
114 | goto found; | ||
115 | |||
116 | /* XXXX.0 -- we got a request for this router. make sure | ||
117 | * that the node is appropriately set. */ | ||
118 | if (to->sat_addr.s_node == ATADDR_ANYNODE && | ||
119 | to->sat_addr.s_net != ATADDR_ANYNET && | ||
120 | atif->address.s_node == at->src_node) { | ||
121 | to->sat_addr.s_node = atif->address.s_node; | ||
122 | goto found; | ||
123 | } | ||
124 | } | ||
125 | s = NULL; | ||
126 | found: | ||
127 | read_unlock_bh(&atalk_sockets_lock); | ||
128 | return s; | ||
129 | } | ||
130 | |||
131 | /** | ||
132 | * atalk_find_or_insert_socket - Try to find a socket matching ADDR | ||
133 | * @sk - socket to insert in the list if it is not there already | ||
134 | * @sat - address to search for | ||
135 | * | ||
136 | * Try to find a socket matching ADDR in the socket list, if found then return | ||
137 | * it. If not, insert SK into the socket list. | ||
138 | * | ||
139 | * This entire operation must execute atomically. | ||
140 | */ | ||
141 | static struct sock *atalk_find_or_insert_socket(struct sock *sk, | ||
142 | struct sockaddr_at *sat) | ||
143 | { | ||
144 | struct sock *s; | ||
145 | struct hlist_node *node; | ||
146 | struct atalk_sock *at; | ||
147 | |||
148 | write_lock_bh(&atalk_sockets_lock); | ||
149 | sk_for_each(s, node, &atalk_sockets) { | ||
150 | at = at_sk(s); | ||
151 | |||
152 | if (at->src_net == sat->sat_addr.s_net && | ||
153 | at->src_node == sat->sat_addr.s_node && | ||
154 | at->src_port == sat->sat_port) | ||
155 | goto found; | ||
156 | } | ||
157 | s = NULL; | ||
158 | __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */ | ||
159 | found: | ||
160 | write_unlock_bh(&atalk_sockets_lock); | ||
161 | return s; | ||
162 | } | ||
163 | |||
164 | static void atalk_destroy_timer(unsigned long data) | ||
165 | { | ||
166 | struct sock *sk = (struct sock *)data; | ||
167 | |||
168 | if (sk_has_allocations(sk)) { | ||
169 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; | ||
170 | add_timer(&sk->sk_timer); | ||
171 | } else | ||
172 | sock_put(sk); | ||
173 | } | ||
174 | |||
175 | static inline void atalk_destroy_socket(struct sock *sk) | ||
176 | { | ||
177 | atalk_remove_socket(sk); | ||
178 | skb_queue_purge(&sk->sk_receive_queue); | ||
179 | |||
180 | if (sk_has_allocations(sk)) { | ||
181 | setup_timer(&sk->sk_timer, atalk_destroy_timer, | ||
182 | (unsigned long)sk); | ||
183 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; | ||
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 */ | ||
196 | struct atalk_route *atalk_routes; | ||
197 | DEFINE_RWLOCK(atalk_routes_lock); | ||
198 | |||
199 | struct atalk_iface *atalk_interfaces; | ||
200 | DEFINE_RWLOCK(atalk_interfaces_lock); | ||
201 | |||
202 | /* For probing devices or in a routerless network */ | ||
203 | struct 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 | */ | ||
210 | static 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 | |||
228 | static struct atalk_iface *atif_add_device(struct net_device *dev, | ||
229 | struct atalk_addr *sa) | ||
230 | { | ||
231 | struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); | ||
232 | |||
233 | if (!iface) | ||
234 | goto out; | ||
235 | |||
236 | dev_hold(dev); | ||
237 | iface->dev = dev; | ||
238 | dev->atalk_ptr = iface; | ||
239 | iface->address = *sa; | ||
240 | iface->status = 0; | ||
241 | |||
242 | write_lock_bh(&atalk_interfaces_lock); | ||
243 | iface->next = atalk_interfaces; | ||
244 | atalk_interfaces = iface; | ||
245 | write_unlock_bh(&atalk_interfaces_lock); | ||
246 | out: | ||
247 | return iface; | ||
248 | } | ||
249 | |||
250 | /* Perform phase 2 AARP probing on our tentative address */ | ||
251 | static int atif_probe_device(struct atalk_iface *atif) | ||
252 | { | ||
253 | int netrange = ntohs(atif->nets.nr_lastnet) - | ||
254 | ntohs(atif->nets.nr_firstnet) + 1; | ||
255 | int probe_net = ntohs(atif->address.s_net); | ||
256 | int probe_node = atif->address.s_node; | ||
257 | int netct, nodect; | ||
258 | |||
259 | /* Offset the network we start probing with */ | ||
260 | if (probe_net == ATADDR_ANYNET) { | ||
261 | probe_net = ntohs(atif->nets.nr_firstnet); | ||
262 | if (netrange) | ||
263 | probe_net += jiffies % netrange; | ||
264 | } | ||
265 | if (probe_node == ATADDR_ANYNODE) | ||
266 | probe_node = jiffies & 0xFF; | ||
267 | |||
268 | /* Scan the networks */ | ||
269 | atif->status |= ATIF_PROBE; | ||
270 | for (netct = 0; netct <= netrange; netct++) { | ||
271 | /* Sweep the available nodes from a given start */ | ||
272 | atif->address.s_net = htons(probe_net); | ||
273 | for (nodect = 0; nodect < 256; nodect++) { | ||
274 | atif->address.s_node = (nodect + probe_node) & 0xFF; | ||
275 | if (atif->address.s_node > 0 && | ||
276 | atif->address.s_node < 254) { | ||
277 | /* Probe a proposed address */ | ||
278 | aarp_probe_network(atif); | ||
279 | |||
280 | if (!(atif->status & ATIF_PROBE_FAIL)) { | ||
281 | atif->status &= ~ATIF_PROBE; | ||
282 | return 0; | ||
283 | } | ||
284 | } | ||
285 | atif->status &= ~ATIF_PROBE_FAIL; | ||
286 | } | ||
287 | probe_net++; | ||
288 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | ||
289 | probe_net = ntohs(atif->nets.nr_firstnet); | ||
290 | } | ||
291 | atif->status &= ~ATIF_PROBE; | ||
292 | |||
293 | return -EADDRINUSE; /* Network is full... */ | ||
294 | } | ||
295 | |||
296 | |||
297 | /* Perform AARP probing for a proxy address */ | ||
298 | static int atif_proxy_probe_device(struct atalk_iface *atif, | ||
299 | struct atalk_addr* proxy_addr) | ||
300 | { | ||
301 | int netrange = ntohs(atif->nets.nr_lastnet) - | ||
302 | ntohs(atif->nets.nr_firstnet) + 1; | ||
303 | /* we probe the interface's network */ | ||
304 | int probe_net = ntohs(atif->address.s_net); | ||
305 | int probe_node = ATADDR_ANYNODE; /* we'll take anything */ | ||
306 | int netct, nodect; | ||
307 | |||
308 | /* Offset the network we start probing with */ | ||
309 | if (probe_net == ATADDR_ANYNET) { | ||
310 | probe_net = ntohs(atif->nets.nr_firstnet); | ||
311 | if (netrange) | ||
312 | probe_net += jiffies % netrange; | ||
313 | } | ||
314 | |||
315 | if (probe_node == ATADDR_ANYNODE) | ||
316 | probe_node = jiffies & 0xFF; | ||
317 | |||
318 | /* Scan the networks */ | ||
319 | for (netct = 0; netct <= netrange; netct++) { | ||
320 | /* Sweep the available nodes from a given start */ | ||
321 | proxy_addr->s_net = htons(probe_net); | ||
322 | for (nodect = 0; nodect < 256; nodect++) { | ||
323 | proxy_addr->s_node = (nodect + probe_node) & 0xFF; | ||
324 | if (proxy_addr->s_node > 0 && | ||
325 | proxy_addr->s_node < 254) { | ||
326 | /* Tell AARP to probe a proposed address */ | ||
327 | int ret = aarp_proxy_probe_network(atif, | ||
328 | proxy_addr); | ||
329 | |||
330 | if (ret != -EADDRINUSE) | ||
331 | return ret; | ||
332 | } | ||
333 | } | ||
334 | probe_net++; | ||
335 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | ||
336 | probe_net = ntohs(atif->nets.nr_firstnet); | ||
337 | } | ||
338 | |||
339 | return -EADDRINUSE; /* Network is full... */ | ||
340 | } | ||
341 | |||
342 | |||
343 | struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) | ||
344 | { | ||
345 | struct atalk_iface *iface = dev->atalk_ptr; | ||
346 | return iface ? &iface->address : NULL; | ||
347 | } | ||
348 | |||
349 | static struct atalk_addr *atalk_find_primary(void) | ||
350 | { | ||
351 | struct atalk_iface *fiface = NULL; | ||
352 | struct atalk_addr *retval; | ||
353 | struct atalk_iface *iface; | ||
354 | |||
355 | /* | ||
356 | * Return a point-to-point interface only if | ||
357 | * there is no non-ptp interface available. | ||
358 | */ | ||
359 | read_lock_bh(&atalk_interfaces_lock); | ||
360 | for (iface = atalk_interfaces; iface; iface = iface->next) { | ||
361 | if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) | ||
362 | fiface = iface; | ||
363 | if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { | ||
364 | retval = &iface->address; | ||
365 | goto out; | ||
366 | } | ||
367 | } | ||
368 | |||
369 | if (fiface) | ||
370 | retval = &fiface->address; | ||
371 | else if (atalk_interfaces) | ||
372 | retval = &atalk_interfaces->address; | ||
373 | else | ||
374 | retval = NULL; | ||
375 | out: | ||
376 | read_unlock_bh(&atalk_interfaces_lock); | ||
377 | return retval; | ||
378 | } | ||
379 | |||
380 | /* | ||
381 | * Find a match for 'any network' - ie any of our interfaces with that | ||
382 | * node number will do just nicely. | ||
383 | */ | ||
384 | static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) | ||
385 | { | ||
386 | struct atalk_iface *iface = dev->atalk_ptr; | ||
387 | |||
388 | if (!iface || iface->status & ATIF_PROBE) | ||
389 | goto out_err; | ||
390 | |||
391 | if (node != ATADDR_BCAST && | ||
392 | iface->address.s_node != node && | ||
393 | node != ATADDR_ANYNODE) | ||
394 | goto out_err; | ||
395 | out: | ||
396 | return iface; | ||
397 | out_err: | ||
398 | iface = NULL; | ||
399 | goto out; | ||
400 | } | ||
401 | |||
402 | /* Find a match for a specific network:node pair */ | ||
403 | static struct atalk_iface *atalk_find_interface(__be16 net, int node) | ||
404 | { | ||
405 | struct atalk_iface *iface; | ||
406 | |||
407 | read_lock_bh(&atalk_interfaces_lock); | ||
408 | for (iface = atalk_interfaces; iface; iface = iface->next) { | ||
409 | if ((node == ATADDR_BCAST || | ||
410 | node == ATADDR_ANYNODE || | ||
411 | iface->address.s_node == node) && | ||
412 | iface->address.s_net == net && | ||
413 | !(iface->status & ATIF_PROBE)) | ||
414 | break; | ||
415 | |||
416 | /* XXXX.0 -- net.0 returns the iface associated with net */ | ||
417 | if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && | ||
418 | ntohs(iface->nets.nr_firstnet) <= ntohs(net) && | ||
419 | ntohs(net) <= ntohs(iface->nets.nr_lastnet)) | ||
420 | break; | ||
421 | } | ||
422 | read_unlock_bh(&atalk_interfaces_lock); | ||
423 | return iface; | ||
424 | } | ||
425 | |||
426 | |||
427 | /* | ||
428 | * Find a route for an AppleTalk packet. This ought to get cached in | ||
429 | * the socket (later on...). We know about host routes and the fact | ||
430 | * that a route must be direct to broadcast. | ||
431 | */ | ||
432 | static struct atalk_route *atrtr_find(struct atalk_addr *target) | ||
433 | { | ||
434 | /* | ||
435 | * we must search through all routes unless we find a | ||
436 | * host route, because some host routes might overlap | ||
437 | * network routes | ||
438 | */ | ||
439 | struct atalk_route *net_route = NULL; | ||
440 | struct atalk_route *r; | ||
441 | |||
442 | read_lock_bh(&atalk_routes_lock); | ||
443 | for (r = atalk_routes; r; r = r->next) { | ||
444 | if (!(r->flags & RTF_UP)) | ||
445 | continue; | ||
446 | |||
447 | if (r->target.s_net == target->s_net) { | ||
448 | if (r->flags & RTF_HOST) { | ||
449 | /* | ||
450 | * if this host route is for the target, | ||
451 | * the we're done | ||
452 | */ | ||
453 | if (r->target.s_node == target->s_node) | ||
454 | goto out; | ||
455 | } else | ||
456 | /* | ||
457 | * this route will work if there isn't a | ||
458 | * direct host route, so cache it | ||
459 | */ | ||
460 | net_route = r; | ||
461 | } | ||
462 | } | ||
463 | |||
464 | /* | ||
465 | * if we found a network route but not a direct host | ||
466 | * route, then return it | ||
467 | */ | ||
468 | if (net_route) | ||
469 | r = net_route; | ||
470 | else if (atrtr_default.dev) | ||
471 | r = &atrtr_default; | ||
472 | else /* No route can be found */ | ||
473 | r = NULL; | ||
474 | out: | ||
475 | read_unlock_bh(&atalk_routes_lock); | ||
476 | return r; | ||
477 | } | ||
478 | |||
479 | |||
480 | /* | ||
481 | * Given an AppleTalk network, find the device to use. This can be | ||
482 | * a simple lookup. | ||
483 | */ | ||
484 | struct net_device *atrtr_get_dev(struct atalk_addr *sa) | ||
485 | { | ||
486 | struct atalk_route *atr = atrtr_find(sa); | ||
487 | return atr ? atr->dev : NULL; | ||
488 | } | ||
489 | |||
490 | /* Set up a default router */ | ||
491 | static void atrtr_set_default(struct net_device *dev) | ||
492 | { | ||
493 | atrtr_default.dev = dev; | ||
494 | atrtr_default.flags = RTF_UP; | ||
495 | atrtr_default.gateway.s_net = htons(0); | ||
496 | atrtr_default.gateway.s_node = 0; | ||
497 | } | ||
498 | |||
499 | /* | ||
500 | * Add a router. Basically make sure it looks valid and stuff the | ||
501 | * entry in the list. While it uses netranges we always set them to one | ||
502 | * entry to work like netatalk. | ||
503 | */ | ||
504 | static int atrtr_create(struct rtentry *r, struct net_device *devhint) | ||
505 | { | ||
506 | struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; | ||
507 | struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; | ||
508 | struct atalk_route *rt; | ||
509 | struct atalk_iface *iface, *riface; | ||
510 | int retval = -EINVAL; | ||
511 | |||
512 | /* | ||
513 | * Fixme: Raise/Lower a routing change semaphore for these | ||
514 | * operations. | ||
515 | */ | ||
516 | |||
517 | /* Validate the request */ | ||
518 | if (ta->sat_family != AF_APPLETALK || | ||
519 | (!devhint && ga->sat_family != AF_APPLETALK)) | ||
520 | goto out; | ||
521 | |||
522 | /* Now walk the routing table and make our decisions */ | ||
523 | write_lock_bh(&atalk_routes_lock); | ||
524 | for (rt = atalk_routes; rt; rt = rt->next) { | ||
525 | if (r->rt_flags != rt->flags) | ||
526 | continue; | ||
527 | |||
528 | if (ta->sat_addr.s_net == rt->target.s_net) { | ||
529 | if (!(rt->flags & RTF_HOST)) | ||
530 | break; | ||
531 | if (ta->sat_addr.s_node == rt->target.s_node) | ||
532 | break; | ||
533 | } | ||
534 | } | ||
535 | |||
536 | if (!devhint) { | ||
537 | riface = NULL; | ||
538 | |||
539 | read_lock_bh(&atalk_interfaces_lock); | ||
540 | for (iface = atalk_interfaces; iface; iface = iface->next) { | ||
541 | if (!riface && | ||
542 | ntohs(ga->sat_addr.s_net) >= | ||
543 | ntohs(iface->nets.nr_firstnet) && | ||
544 | ntohs(ga->sat_addr.s_net) <= | ||
545 | ntohs(iface->nets.nr_lastnet)) | ||
546 | riface = iface; | ||
547 | |||
548 | if (ga->sat_addr.s_net == iface->address.s_net && | ||
549 | ga->sat_addr.s_node == iface->address.s_node) | ||
550 | riface = iface; | ||
551 | } | ||
552 | read_unlock_bh(&atalk_interfaces_lock); | ||
553 | |||
554 | retval = -ENETUNREACH; | ||
555 | if (!riface) | ||
556 | goto out_unlock; | ||
557 | |||
558 | devhint = riface->dev; | ||
559 | } | ||
560 | |||
561 | if (!rt) { | ||
562 | rt = kzalloc(sizeof(*rt), GFP_ATOMIC); | ||
563 | |||
564 | retval = -ENOBUFS; | ||
565 | if (!rt) | ||
566 | goto out_unlock; | ||
567 | |||
568 | rt->next = atalk_routes; | ||
569 | atalk_routes = rt; | ||
570 | } | ||
571 | |||
572 | /* Fill in the routing entry */ | ||
573 | rt->target = ta->sat_addr; | ||
574 | dev_hold(devhint); | ||
575 | rt->dev = devhint; | ||
576 | rt->flags = r->rt_flags; | ||
577 | rt->gateway = ga->sat_addr; | ||
578 | |||
579 | retval = 0; | ||
580 | out_unlock: | ||
581 | write_unlock_bh(&atalk_routes_lock); | ||
582 | out: | ||
583 | return retval; | ||
584 | } | ||
585 | |||
586 | /* Delete a route. Find it and discard it */ | ||
587 | static int atrtr_delete(struct atalk_addr * addr) | ||
588 | { | ||
589 | struct atalk_route **r = &atalk_routes; | ||
590 | int retval = 0; | ||
591 | struct atalk_route *tmp; | ||
592 | |||
593 | write_lock_bh(&atalk_routes_lock); | ||
594 | while ((tmp = *r) != NULL) { | ||
595 | if (tmp->target.s_net == addr->s_net && | ||
596 | (!(tmp->flags&RTF_GATEWAY) || | ||
597 | tmp->target.s_node == addr->s_node)) { | ||
598 | *r = tmp->next; | ||
599 | dev_put(tmp->dev); | ||
600 | kfree(tmp); | ||
601 | goto out; | ||
602 | } | ||
603 | r = &tmp->next; | ||
604 | } | ||
605 | retval = -ENOENT; | ||
606 | out: | ||
607 | write_unlock_bh(&atalk_routes_lock); | ||
608 | return retval; | ||
609 | } | ||
610 | |||
611 | /* | ||
612 | * Called when a device is downed. Just throw away any routes | ||
613 | * via it. | ||
614 | */ | ||
615 | static void atrtr_device_down(struct net_device *dev) | ||
616 | { | ||
617 | struct atalk_route **r = &atalk_routes; | ||
618 | struct atalk_route *tmp; | ||
619 | |||
620 | write_lock_bh(&atalk_routes_lock); | ||
621 | while ((tmp = *r) != NULL) { | ||
622 | if (tmp->dev == dev) { | ||
623 | *r = tmp->next; | ||
624 | dev_put(dev); | ||
625 | kfree(tmp); | ||
626 | } else | ||
627 | r = &tmp->next; | ||
628 | } | ||
629 | write_unlock_bh(&atalk_routes_lock); | ||
630 | |||
631 | if (atrtr_default.dev == dev) | ||
632 | atrtr_set_default(NULL); | ||
633 | } | ||
634 | |||
635 | /* Actually down the interface */ | ||
636 | static inline void atalk_dev_down(struct net_device *dev) | ||
637 | { | ||
638 | atrtr_device_down(dev); /* Remove all routes for the device */ | ||
639 | aarp_device_down(dev); /* Remove AARP entries for the device */ | ||
640 | atif_drop_device(dev); /* Remove the device */ | ||
641 | } | ||
642 | |||
643 | /* | ||
644 | * A device event has occurred. Watch for devices going down and | ||
645 | * delete our use of them (iface and route). | ||
646 | */ | ||
647 | static int ddp_device_event(struct notifier_block *this, unsigned long event, | ||
648 | void *ptr) | ||
649 | { | ||
650 | struct net_device *dev = ptr; | ||
651 | |||
652 | if (!net_eq(dev_net(dev), &init_net)) | ||
653 | return NOTIFY_DONE; | ||
654 | |||
655 | if (event == NETDEV_DOWN) | ||
656 | /* Discard any use of this */ | ||
657 | atalk_dev_down(dev); | ||
658 | |||
659 | return NOTIFY_DONE; | ||
660 | } | ||
661 | |||
662 | /* ioctl calls. Shouldn't even need touching */ | ||
663 | /* Device configuration ioctl calls */ | ||
664 | static int atif_ioctl(int cmd, void __user *arg) | ||
665 | { | ||
666 | static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; | ||
667 | struct ifreq atreq; | ||
668 | struct atalk_netrange *nr; | ||
669 | struct sockaddr_at *sa; | ||
670 | struct net_device *dev; | ||
671 | struct atalk_iface *atif; | ||
672 | int ct; | ||
673 | int limit; | ||
674 | struct rtentry rtdef; | ||
675 | int add_route; | ||
676 | |||
677 | if (copy_from_user(&atreq, arg, sizeof(atreq))) | ||
678 | return -EFAULT; | ||
679 | |||
680 | dev = __dev_get_by_name(&init_net, atreq.ifr_name); | ||
681 | if (!dev) | ||
682 | return -ENODEV; | ||
683 | |||
684 | sa = (struct sockaddr_at *)&atreq.ifr_addr; | ||
685 | atif = atalk_find_dev(dev); | ||
686 | |||
687 | switch (cmd) { | ||
688 | case SIOCSIFADDR: | ||
689 | if (!capable(CAP_NET_ADMIN)) | ||
690 | return -EPERM; | ||
691 | if (sa->sat_family != AF_APPLETALK) | ||
692 | return -EINVAL; | ||
693 | if (dev->type != ARPHRD_ETHER && | ||
694 | dev->type != ARPHRD_LOOPBACK && | ||
695 | dev->type != ARPHRD_LOCALTLK && | ||
696 | dev->type != ARPHRD_PPP) | ||
697 | return -EPROTONOSUPPORT; | ||
698 | |||
699 | nr = (struct atalk_netrange *)&sa->sat_zero[0]; | ||
700 | add_route = 1; | ||
701 | |||
702 | /* | ||
703 | * if this is a point-to-point iface, and we already | ||
704 | * have an iface for this AppleTalk address, then we | ||
705 | * should not add a route | ||
706 | */ | ||
707 | if ((dev->flags & IFF_POINTOPOINT) && | ||
708 | atalk_find_interface(sa->sat_addr.s_net, | ||
709 | sa->sat_addr.s_node)) { | ||
710 | printk(KERN_DEBUG "AppleTalk: point-to-point " | ||
711 | "interface added with " | ||
712 | "existing address\n"); | ||
713 | add_route = 0; | ||
714 | } | ||
715 | |||
716 | /* | ||
717 | * Phase 1 is fine on LocalTalk but we don't do | ||
718 | * EtherTalk phase 1. Anyone wanting to add it go ahead. | ||
719 | */ | ||
720 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | ||
721 | return -EPROTONOSUPPORT; | ||
722 | if (sa->sat_addr.s_node == ATADDR_BCAST || | ||
723 | sa->sat_addr.s_node == 254) | ||
724 | return -EINVAL; | ||
725 | if (atif) { | ||
726 | /* Already setting address */ | ||
727 | if (atif->status & ATIF_PROBE) | ||
728 | return -EBUSY; | ||
729 | |||
730 | atif->address.s_net = sa->sat_addr.s_net; | ||
731 | atif->address.s_node = sa->sat_addr.s_node; | ||
732 | atrtr_device_down(dev); /* Flush old routes */ | ||
733 | } else { | ||
734 | atif = atif_add_device(dev, &sa->sat_addr); | ||
735 | if (!atif) | ||
736 | return -ENOMEM; | ||
737 | } | ||
738 | atif->nets = *nr; | ||
739 | |||
740 | /* | ||
741 | * Check if the chosen address is used. If so we | ||
742 | * error and atalkd will try another. | ||
743 | */ | ||
744 | |||
745 | if (!(dev->flags & IFF_LOOPBACK) && | ||
746 | !(dev->flags & IFF_POINTOPOINT) && | ||
747 | atif_probe_device(atif) < 0) { | ||
748 | atif_drop_device(dev); | ||
749 | return -EADDRINUSE; | ||
750 | } | ||
751 | |||
752 | /* Hey it worked - add the direct routes */ | ||
753 | sa = (struct sockaddr_at *)&rtdef.rt_gateway; | ||
754 | sa->sat_family = AF_APPLETALK; | ||
755 | sa->sat_addr.s_net = atif->address.s_net; | ||
756 | sa->sat_addr.s_node = atif->address.s_node; | ||
757 | sa = (struct sockaddr_at *)&rtdef.rt_dst; | ||
758 | rtdef.rt_flags = RTF_UP; | ||
759 | sa->sat_family = AF_APPLETALK; | ||
760 | sa->sat_addr.s_node = ATADDR_ANYNODE; | ||
761 | if (dev->flags & IFF_LOOPBACK || | ||
762 | dev->flags & IFF_POINTOPOINT) | ||
763 | rtdef.rt_flags |= RTF_HOST; | ||
764 | |||
765 | /* Routerless initial state */ | ||
766 | if (nr->nr_firstnet == htons(0) && | ||
767 | nr->nr_lastnet == htons(0xFFFE)) { | ||
768 | sa->sat_addr.s_net = atif->address.s_net; | ||
769 | atrtr_create(&rtdef, dev); | ||
770 | atrtr_set_default(dev); | ||
771 | } else { | ||
772 | limit = ntohs(nr->nr_lastnet); | ||
773 | if (limit - ntohs(nr->nr_firstnet) > 4096) { | ||
774 | printk(KERN_WARNING "Too many routes/" | ||
775 | "iface.\n"); | ||
776 | return -EINVAL; | ||
777 | } | ||
778 | if (add_route) | ||
779 | for (ct = ntohs(nr->nr_firstnet); | ||
780 | ct <= limit; ct++) { | ||
781 | sa->sat_addr.s_net = htons(ct); | ||
782 | atrtr_create(&rtdef, dev); | ||
783 | } | ||
784 | } | ||
785 | dev_mc_add_global(dev, aarp_mcast); | ||
786 | return 0; | ||
787 | |||
788 | case SIOCGIFADDR: | ||
789 | if (!atif) | ||
790 | return -EADDRNOTAVAIL; | ||
791 | |||
792 | sa->sat_family = AF_APPLETALK; | ||
793 | sa->sat_addr = atif->address; | ||
794 | break; | ||
795 | |||
796 | case SIOCGIFBRDADDR: | ||
797 | if (!atif) | ||
798 | return -EADDRNOTAVAIL; | ||
799 | |||
800 | sa->sat_family = AF_APPLETALK; | ||
801 | sa->sat_addr.s_net = atif->address.s_net; | ||
802 | sa->sat_addr.s_node = ATADDR_BCAST; | ||
803 | break; | ||
804 | |||
805 | case SIOCATALKDIFADDR: | ||
806 | case SIOCDIFADDR: | ||
807 | if (!capable(CAP_NET_ADMIN)) | ||
808 | return -EPERM; | ||
809 | if (sa->sat_family != AF_APPLETALK) | ||
810 | return -EINVAL; | ||
811 | atalk_dev_down(dev); | ||
812 | break; | ||
813 | |||
814 | case SIOCSARP: | ||
815 | if (!capable(CAP_NET_ADMIN)) | ||
816 | return -EPERM; | ||
817 | if (sa->sat_family != AF_APPLETALK) | ||
818 | return -EINVAL; | ||
819 | /* | ||
820 | * for now, we only support proxy AARP on ELAP; | ||
821 | * we should be able to do it for LocalTalk, too. | ||
822 | */ | ||
823 | if (dev->type != ARPHRD_ETHER) | ||
824 | return -EPROTONOSUPPORT; | ||
825 | |||
826 | /* | ||
827 | * atif points to the current interface on this network; | ||
828 | * we aren't concerned about its current status (at | ||
829 | * least for now), but it has all the settings about | ||
830 | * the network we're going to probe. Consequently, it | ||
831 | * must exist. | ||
832 | */ | ||
833 | if (!atif) | ||
834 | return -EADDRNOTAVAIL; | ||
835 | |||
836 | nr = (struct atalk_netrange *)&(atif->nets); | ||
837 | /* | ||
838 | * Phase 1 is fine on Localtalk but we don't do | ||
839 | * Ethertalk phase 1. Anyone wanting to add it go ahead. | ||
840 | */ | ||
841 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | ||
842 | return -EPROTONOSUPPORT; | ||
843 | |||
844 | if (sa->sat_addr.s_node == ATADDR_BCAST || | ||
845 | sa->sat_addr.s_node == 254) | ||
846 | return -EINVAL; | ||
847 | |||
848 | /* | ||
849 | * Check if the chosen address is used. If so we | ||
850 | * error and ATCP will try another. | ||
851 | */ | ||
852 | if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) | ||
853 | return -EADDRINUSE; | ||
854 | |||
855 | /* | ||
856 | * We now have an address on the local network, and | ||
857 | * the AARP code will defend it for us until we take it | ||
858 | * down. We don't set up any routes right now, because | ||
859 | * ATCP will install them manually via SIOCADDRT. | ||
860 | */ | ||
861 | break; | ||
862 | |||
863 | case SIOCDARP: | ||
864 | if (!capable(CAP_NET_ADMIN)) | ||
865 | return -EPERM; | ||
866 | if (sa->sat_family != AF_APPLETALK) | ||
867 | return -EINVAL; | ||
868 | if (!atif) | ||
869 | return -EADDRNOTAVAIL; | ||
870 | |||
871 | /* give to aarp module to remove proxy entry */ | ||
872 | aarp_proxy_remove(atif->dev, &(sa->sat_addr)); | ||
873 | return 0; | ||
874 | } | ||
875 | |||
876 | return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; | ||
877 | } | ||
878 | |||
879 | /* Routing ioctl() calls */ | ||
880 | static int atrtr_ioctl(unsigned int cmd, void __user *arg) | ||
881 | { | ||
882 | struct rtentry rt; | ||
883 | |||
884 | if (copy_from_user(&rt, arg, sizeof(rt))) | ||
885 | return -EFAULT; | ||
886 | |||
887 | switch (cmd) { | ||
888 | case SIOCDELRT: | ||
889 | if (rt.rt_dst.sa_family != AF_APPLETALK) | ||
890 | return -EINVAL; | ||
891 | return atrtr_delete(&((struct sockaddr_at *) | ||
892 | &rt.rt_dst)->sat_addr); | ||
893 | |||
894 | case SIOCADDRT: { | ||
895 | struct net_device *dev = NULL; | ||
896 | if (rt.rt_dev) { | ||
897 | char name[IFNAMSIZ]; | ||
898 | if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1)) | ||
899 | return -EFAULT; | ||
900 | name[IFNAMSIZ-1] = '\0'; | ||
901 | dev = __dev_get_by_name(&init_net, name); | ||
902 | if (!dev) | ||
903 | return -ENODEV; | ||
904 | } | ||
905 | return atrtr_create(&rt, dev); | ||
906 | } | ||
907 | } | ||
908 | return -EINVAL; | ||
909 | } | ||
910 | |||
911 | /**************************************************************************\ | ||
912 | * * | ||
913 | * Handling for system calls applied via the various interfaces to an * | ||
914 | * AppleTalk socket object. * | ||
915 | * * | ||
916 | \**************************************************************************/ | ||
917 | |||
918 | /* | ||
919 | * Checksum: This is 'optional'. It's quite likely also a good | ||
920 | * candidate for assembler hackery 8) | ||
921 | */ | ||
922 | static unsigned long atalk_sum_partial(const unsigned char *data, | ||
923 | int len, unsigned long sum) | ||
924 | { | ||
925 | /* This ought to be unwrapped neatly. I'll trust gcc for now */ | ||
926 | while (len--) { | ||
927 | sum += *data++; | ||
928 | sum = rol16(sum, 1); | ||
929 | } | ||
930 | return sum; | ||
931 | } | ||
932 | |||
933 | /* Checksum skb data -- similar to skb_checksum */ | ||
934 | static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, | ||
935 | int len, unsigned long sum) | ||
936 | { | ||
937 | int start = skb_headlen(skb); | ||
938 | struct sk_buff *frag_iter; | ||
939 | int i, copy; | ||
940 | |||
941 | /* checksum stuff in header space */ | ||
942 | if ( (copy = start - offset) > 0) { | ||
943 | if (copy > len) | ||
944 | copy = len; | ||
945 | sum = atalk_sum_partial(skb->data + offset, copy, sum); | ||
946 | if ( (len -= copy) == 0) | ||
947 | return sum; | ||
948 | |||
949 | offset += copy; | ||
950 | } | ||
951 | |||
952 | /* checksum stuff in frags */ | ||
953 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | ||
954 | int end; | ||
955 | |||
956 | WARN_ON(start > offset + len); | ||
957 | |||
958 | end = start + skb_shinfo(skb)->frags[i].size; | ||
959 | if ((copy = end - offset) > 0) { | ||
960 | u8 *vaddr; | ||
961 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | ||
962 | |||
963 | if (copy > len) | ||
964 | copy = len; | ||
965 | vaddr = kmap_skb_frag(frag); | ||
966 | sum = atalk_sum_partial(vaddr + frag->page_offset + | ||
967 | offset - start, copy, sum); | ||
968 | kunmap_skb_frag(vaddr); | ||
969 | |||
970 | if (!(len -= copy)) | ||
971 | return sum; | ||
972 | offset += copy; | ||
973 | } | ||
974 | start = end; | ||
975 | } | ||
976 | |||
977 | skb_walk_frags(skb, frag_iter) { | ||
978 | int end; | ||
979 | |||
980 | WARN_ON(start > offset + len); | ||
981 | |||
982 | end = start + frag_iter->len; | ||
983 | if ((copy = end - offset) > 0) { | ||
984 | if (copy > len) | ||
985 | copy = len; | ||
986 | sum = atalk_sum_skb(frag_iter, offset - start, | ||
987 | copy, sum); | ||
988 | if ((len -= copy) == 0) | ||
989 | return sum; | ||
990 | offset += copy; | ||
991 | } | ||
992 | start = end; | ||
993 | } | ||
994 | |||
995 | BUG_ON(len > 0); | ||
996 | |||
997 | return sum; | ||
998 | } | ||
999 | |||
1000 | static __be16 atalk_checksum(const struct sk_buff *skb, int len) | ||
1001 | { | ||
1002 | unsigned long sum; | ||
1003 | |||
1004 | /* skip header 4 bytes */ | ||
1005 | sum = atalk_sum_skb(skb, 4, len-4, 0); | ||
1006 | |||
1007 | /* Use 0xFFFF for 0. 0 itself means none */ | ||
1008 | return sum ? htons((unsigned short)sum) : htons(0xFFFF); | ||
1009 | } | ||
1010 | |||
1011 | static struct proto ddp_proto = { | ||
1012 | .name = "DDP", | ||
1013 | .owner = THIS_MODULE, | ||
1014 | .obj_size = sizeof(struct atalk_sock), | ||
1015 | }; | ||
1016 | |||
1017 | /* | ||
1018 | * Create a socket. Initialise the socket, blank the addresses | ||
1019 | * set the state. | ||
1020 | */ | ||
1021 | static int atalk_create(struct net *net, struct socket *sock, int protocol, | ||
1022 | int kern) | ||
1023 | { | ||
1024 | struct sock *sk; | ||
1025 | int rc = -ESOCKTNOSUPPORT; | ||
1026 | |||
1027 | if (!net_eq(net, &init_net)) | ||
1028 | return -EAFNOSUPPORT; | ||
1029 | |||
1030 | /* | ||
1031 | * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do | ||
1032 | * and gives you the full ELAP frame. Should be handy for CAP 8) | ||
1033 | */ | ||
1034 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) | ||
1035 | goto out; | ||
1036 | rc = -ENOMEM; | ||
1037 | sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto); | ||
1038 | if (!sk) | ||
1039 | goto out; | ||
1040 | rc = 0; | ||
1041 | sock->ops = &atalk_dgram_ops; | ||
1042 | sock_init_data(sock, sk); | ||
1043 | |||
1044 | /* Checksums on by default */ | ||
1045 | sock_set_flag(sk, SOCK_ZAPPED); | ||
1046 | out: | ||
1047 | return rc; | ||
1048 | } | ||
1049 | |||
1050 | /* Free a socket. No work needed */ | ||
1051 | static int atalk_release(struct socket *sock) | ||
1052 | { | ||
1053 | struct sock *sk = sock->sk; | ||
1054 | |||
1055 | lock_kernel(); | ||
1056 | if (sk) { | ||
1057 | sock_orphan(sk); | ||
1058 | sock->sk = NULL; | ||
1059 | atalk_destroy_socket(sk); | ||
1060 | } | ||
1061 | unlock_kernel(); | ||
1062 | return 0; | ||
1063 | } | ||
1064 | |||
1065 | /** | ||
1066 | * atalk_pick_and_bind_port - Pick a source port when one is not given | ||
1067 | * @sk - socket to insert into the tables | ||
1068 | * @sat - address to search for | ||
1069 | * | ||
1070 | * Pick a source port when one is not given. If we can find a suitable free | ||
1071 | * one, we insert the socket into the tables using it. | ||
1072 | * | ||
1073 | * This whole operation must be atomic. | ||
1074 | */ | ||
1075 | static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat) | ||
1076 | { | ||
1077 | int retval; | ||
1078 | |||
1079 | write_lock_bh(&atalk_sockets_lock); | ||
1080 | |||
1081 | for (sat->sat_port = ATPORT_RESERVED; | ||
1082 | sat->sat_port < ATPORT_LAST; | ||
1083 | sat->sat_port++) { | ||
1084 | struct sock *s; | ||
1085 | struct hlist_node *node; | ||
1086 | |||
1087 | sk_for_each(s, node, &atalk_sockets) { | ||
1088 | struct atalk_sock *at = at_sk(s); | ||
1089 | |||
1090 | if (at->src_net == sat->sat_addr.s_net && | ||
1091 | at->src_node == sat->sat_addr.s_node && | ||
1092 | at->src_port == sat->sat_port) | ||
1093 | goto try_next_port; | ||
1094 | } | ||
1095 | |||
1096 | /* Wheee, it's free, assign and insert. */ | ||
1097 | __atalk_insert_socket(sk); | ||
1098 | at_sk(sk)->src_port = sat->sat_port; | ||
1099 | retval = 0; | ||
1100 | goto out; | ||
1101 | |||
1102 | try_next_port:; | ||
1103 | } | ||
1104 | |||
1105 | retval = -EBUSY; | ||
1106 | out: | ||
1107 | write_unlock_bh(&atalk_sockets_lock); | ||
1108 | return retval; | ||
1109 | } | ||
1110 | |||
1111 | static int atalk_autobind(struct sock *sk) | ||
1112 | { | ||
1113 | struct atalk_sock *at = at_sk(sk); | ||
1114 | struct sockaddr_at sat; | ||
1115 | struct atalk_addr *ap = atalk_find_primary(); | ||
1116 | int n = -EADDRNOTAVAIL; | ||
1117 | |||
1118 | if (!ap || ap->s_net == htons(ATADDR_ANYNET)) | ||
1119 | goto out; | ||
1120 | |||
1121 | at->src_net = sat.sat_addr.s_net = ap->s_net; | ||
1122 | at->src_node = sat.sat_addr.s_node = ap->s_node; | ||
1123 | |||
1124 | n = atalk_pick_and_bind_port(sk, &sat); | ||
1125 | if (!n) | ||
1126 | sock_reset_flag(sk, SOCK_ZAPPED); | ||
1127 | out: | ||
1128 | return n; | ||
1129 | } | ||
1130 | |||
1131 | /* Set the address 'our end' of the connection */ | ||
1132 | static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | ||
1133 | { | ||
1134 | struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; | ||
1135 | struct sock *sk = sock->sk; | ||
1136 | struct atalk_sock *at = at_sk(sk); | ||
1137 | int err; | ||
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 | lock_kernel(); | ||
1147 | if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { | ||
1148 | struct atalk_addr *ap = atalk_find_primary(); | ||
1149 | |||
1150 | err = -EADDRNOTAVAIL; | ||
1151 | if (!ap) | ||
1152 | goto out; | ||
1153 | |||
1154 | at->src_net = addr->sat_addr.s_net = ap->s_net; | ||
1155 | at->src_node = addr->sat_addr.s_node= ap->s_node; | ||
1156 | } else { | ||
1157 | err = -EADDRNOTAVAIL; | ||
1158 | if (!atalk_find_interface(addr->sat_addr.s_net, | ||
1159 | addr->sat_addr.s_node)) | ||
1160 | goto out; | ||
1161 | |||
1162 | at->src_net = addr->sat_addr.s_net; | ||
1163 | at->src_node = addr->sat_addr.s_node; | ||
1164 | } | ||
1165 | |||
1166 | if (addr->sat_port == ATADDR_ANYPORT) { | ||
1167 | err = atalk_pick_and_bind_port(sk, addr); | ||
1168 | |||
1169 | if (err < 0) | ||
1170 | goto out; | ||
1171 | } else { | ||
1172 | at->src_port = addr->sat_port; | ||
1173 | |||
1174 | err = -EADDRINUSE; | ||
1175 | if (atalk_find_or_insert_socket(sk, addr)) | ||
1176 | goto out; | ||
1177 | } | ||
1178 | |||
1179 | sock_reset_flag(sk, SOCK_ZAPPED); | ||
1180 | err = 0; | ||
1181 | out: | ||
1182 | unlock_kernel(); | ||
1183 | return err; | ||
1184 | } | ||
1185 | |||
1186 | /* Set the address we talk to */ | ||
1187 | static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, | ||
1188 | int addr_len, int flags) | ||
1189 | { | ||
1190 | struct sock *sk = sock->sk; | ||
1191 | struct atalk_sock *at = at_sk(sk); | ||
1192 | struct sockaddr_at *addr; | ||
1193 | int err; | ||
1194 | |||
1195 | sk->sk_state = TCP_CLOSE; | ||
1196 | sock->state = SS_UNCONNECTED; | ||
1197 | |||
1198 | if (addr_len != sizeof(*addr)) | ||
1199 | return -EINVAL; | ||
1200 | |||
1201 | addr = (struct sockaddr_at *)uaddr; | ||
1202 | |||
1203 | if (addr->sat_family != AF_APPLETALK) | ||
1204 | return -EAFNOSUPPORT; | ||
1205 | |||
1206 | if (addr->sat_addr.s_node == ATADDR_BCAST && | ||
1207 | !sock_flag(sk, SOCK_BROADCAST)) { | ||
1208 | #if 1 | ||
1209 | printk(KERN_WARNING "%s is broken and did not set " | ||
1210 | "SO_BROADCAST. It will break when 2.2 is " | ||
1211 | "released.\n", | ||
1212 | current->comm); | ||
1213 | #else | ||
1214 | return -EACCES; | ||
1215 | #endif | ||
1216 | } | ||
1217 | |||
1218 | lock_kernel(); | ||
1219 | err = -EBUSY; | ||
1220 | if (sock_flag(sk, SOCK_ZAPPED)) | ||
1221 | if (atalk_autobind(sk) < 0) | ||
1222 | goto out; | ||
1223 | |||
1224 | err = -ENETUNREACH; | ||
1225 | if (!atrtr_get_dev(&addr->sat_addr)) | ||
1226 | goto out; | ||
1227 | |||
1228 | at->dest_port = addr->sat_port; | ||
1229 | at->dest_net = addr->sat_addr.s_net; | ||
1230 | at->dest_node = addr->sat_addr.s_node; | ||
1231 | |||
1232 | sock->state = SS_CONNECTED; | ||
1233 | sk->sk_state = TCP_ESTABLISHED; | ||
1234 | err = 0; | ||
1235 | out: | ||
1236 | unlock_kernel(); | ||
1237 | return err; | ||
1238 | } | ||
1239 | |||
1240 | /* | ||
1241 | * Find the name of an AppleTalk socket. Just copy the right | ||
1242 | * fields into the sockaddr. | ||
1243 | */ | ||
1244 | static int atalk_getname(struct socket *sock, struct sockaddr *uaddr, | ||
1245 | int *uaddr_len, int peer) | ||
1246 | { | ||
1247 | struct sockaddr_at sat; | ||
1248 | struct sock *sk = sock->sk; | ||
1249 | struct atalk_sock *at = at_sk(sk); | ||
1250 | int err; | ||
1251 | |||
1252 | lock_kernel(); | ||
1253 | err = -ENOBUFS; | ||
1254 | if (sock_flag(sk, SOCK_ZAPPED)) | ||
1255 | if (atalk_autobind(sk) < 0) | ||
1256 | goto out; | ||
1257 | |||
1258 | *uaddr_len = sizeof(struct sockaddr_at); | ||
1259 | memset(&sat.sat_zero, 0, sizeof(sat.sat_zero)); | ||
1260 | |||
1261 | if (peer) { | ||
1262 | err = -ENOTCONN; | ||
1263 | if (sk->sk_state != TCP_ESTABLISHED) | ||
1264 | goto out; | ||
1265 | |||
1266 | sat.sat_addr.s_net = at->dest_net; | ||
1267 | sat.sat_addr.s_node = at->dest_node; | ||
1268 | sat.sat_port = at->dest_port; | ||
1269 | } else { | ||
1270 | sat.sat_addr.s_net = at->src_net; | ||
1271 | sat.sat_addr.s_node = at->src_node; | ||
1272 | sat.sat_port = at->src_port; | ||
1273 | } | ||
1274 | |||
1275 | err = 0; | ||
1276 | sat.sat_family = AF_APPLETALK; | ||
1277 | memcpy(uaddr, &sat, sizeof(sat)); | ||
1278 | |||
1279 | out: | ||
1280 | unlock_kernel(); | ||
1281 | return err; | ||
1282 | } | ||
1283 | |||
1284 | static unsigned int atalk_poll(struct file *file, struct socket *sock, | ||
1285 | poll_table *wait) | ||
1286 | { | ||
1287 | int err; | ||
1288 | lock_kernel(); | ||
1289 | err = datagram_poll(file, sock, wait); | ||
1290 | unlock_kernel(); | ||
1291 | return err; | ||
1292 | } | ||
1293 | |||
1294 | #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE) | ||
1295 | static __inline__ int is_ip_over_ddp(struct sk_buff *skb) | ||
1296 | { | ||
1297 | return skb->data[12] == 22; | ||
1298 | } | ||
1299 | |||
1300 | static int handle_ip_over_ddp(struct sk_buff *skb) | ||
1301 | { | ||
1302 | struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0"); | ||
1303 | struct net_device_stats *stats; | ||
1304 | |||
1305 | /* This needs to be able to handle ipddp"N" devices */ | ||
1306 | if (!dev) { | ||
1307 | kfree_skb(skb); | ||
1308 | return NET_RX_DROP; | ||
1309 | } | ||
1310 | |||
1311 | skb->protocol = htons(ETH_P_IP); | ||
1312 | skb_pull(skb, 13); | ||
1313 | skb->dev = dev; | ||
1314 | skb_reset_transport_header(skb); | ||
1315 | |||
1316 | stats = netdev_priv(dev); | ||
1317 | stats->rx_packets++; | ||
1318 | stats->rx_bytes += skb->len + 13; | ||
1319 | return netif_rx(skb); /* Send the SKB up to a higher place. */ | ||
1320 | } | ||
1321 | #else | ||
1322 | /* make it easy for gcc to optimize this test out, i.e. kill the code */ | ||
1323 | #define is_ip_over_ddp(skb) 0 | ||
1324 | #define handle_ip_over_ddp(skb) 0 | ||
1325 | #endif | ||
1326 | |||
1327 | static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev, | ||
1328 | struct ddpehdr *ddp, __u16 len_hops, int origlen) | ||
1329 | { | ||
1330 | struct atalk_route *rt; | ||
1331 | struct atalk_addr ta; | ||
1332 | |||
1333 | /* | ||
1334 | * Don't route multicast, etc., packets, or packets sent to "this | ||
1335 | * network" | ||
1336 | */ | ||
1337 | if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { | ||
1338 | /* | ||
1339 | * FIXME: | ||
1340 | * | ||
1341 | * Can it ever happen that a packet is from a PPP iface and | ||
1342 | * needs to be broadcast onto the default network? | ||
1343 | */ | ||
1344 | if (dev->type == ARPHRD_PPP) | ||
1345 | printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " | ||
1346 | "packet received from PPP iface\n"); | ||
1347 | goto free_it; | ||
1348 | } | ||
1349 | |||
1350 | ta.s_net = ddp->deh_dnet; | ||
1351 | ta.s_node = ddp->deh_dnode; | ||
1352 | |||
1353 | /* Route the packet */ | ||
1354 | rt = atrtr_find(&ta); | ||
1355 | /* increment hops count */ | ||
1356 | len_hops += 1 << 10; | ||
1357 | if (!rt || !(len_hops & (15 << 10))) | ||
1358 | goto free_it; | ||
1359 | |||
1360 | /* FIXME: use skb->cb to be able to use shared skbs */ | ||
1361 | |||
1362 | /* | ||
1363 | * Route goes through another gateway, so set the target to the | ||
1364 | * gateway instead. | ||
1365 | */ | ||
1366 | |||
1367 | if (rt->flags & RTF_GATEWAY) { | ||
1368 | ta.s_net = rt->gateway.s_net; | ||
1369 | ta.s_node = rt->gateway.s_node; | ||
1370 | } | ||
1371 | |||
1372 | /* Fix up skb->len field */ | ||
1373 | skb_trim(skb, min_t(unsigned int, origlen, | ||
1374 | (rt->dev->hard_header_len + | ||
1375 | ddp_dl->header_length + (len_hops & 1023)))); | ||
1376 | |||
1377 | /* FIXME: use skb->cb to be able to use shared skbs */ | ||
1378 | ddp->deh_len_hops = htons(len_hops); | ||
1379 | |||
1380 | /* | ||
1381 | * Send the buffer onwards | ||
1382 | * | ||
1383 | * Now we must always be careful. If it's come from LocalTalk to | ||
1384 | * EtherTalk it might not fit | ||
1385 | * | ||
1386 | * Order matters here: If a packet has to be copied to make a new | ||
1387 | * headroom (rare hopefully) then it won't need unsharing. | ||
1388 | * | ||
1389 | * Note. ddp-> becomes invalid at the realloc. | ||
1390 | */ | ||
1391 | if (skb_headroom(skb) < 22) { | ||
1392 | /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ | ||
1393 | struct sk_buff *nskb = skb_realloc_headroom(skb, 32); | ||
1394 | kfree_skb(skb); | ||
1395 | skb = nskb; | ||
1396 | } else | ||
1397 | skb = skb_unshare(skb, GFP_ATOMIC); | ||
1398 | |||
1399 | /* | ||
1400 | * If the buffer didn't vanish into the lack of space bitbucket we can | ||
1401 | * send it. | ||
1402 | */ | ||
1403 | if (skb == NULL) | ||
1404 | goto drop; | ||
1405 | |||
1406 | if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP) | ||
1407 | return NET_RX_DROP; | ||
1408 | return NET_RX_SUCCESS; | ||
1409 | free_it: | ||
1410 | kfree_skb(skb); | ||
1411 | drop: | ||
1412 | return NET_RX_DROP; | ||
1413 | } | ||
1414 | |||
1415 | /** | ||
1416 | * atalk_rcv - Receive a packet (in skb) from device dev | ||
1417 | * @skb - packet received | ||
1418 | * @dev - network device where the packet comes from | ||
1419 | * @pt - packet type | ||
1420 | * | ||
1421 | * Receive a packet (in skb) from device dev. This has come from the SNAP | ||
1422 | * decoder, and on entry skb->transport_header is the DDP header, skb->len | ||
1423 | * is the DDP header, skb->len is the DDP length. The physical headers | ||
1424 | * have been extracted. PPP should probably pass frames marked as for this | ||
1425 | * layer. [ie ARPHRD_ETHERTALK] | ||
1426 | */ | ||
1427 | static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, | ||
1428 | struct packet_type *pt, struct net_device *orig_dev) | ||
1429 | { | ||
1430 | struct ddpehdr *ddp; | ||
1431 | struct sock *sock; | ||
1432 | struct atalk_iface *atif; | ||
1433 | struct sockaddr_at tosat; | ||
1434 | int origlen; | ||
1435 | __u16 len_hops; | ||
1436 | |||
1437 | if (!net_eq(dev_net(dev), &init_net)) | ||
1438 | goto drop; | ||
1439 | |||
1440 | /* Don't mangle buffer if shared */ | ||
1441 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) | ||
1442 | goto out; | ||
1443 | |||
1444 | /* Size check and make sure header is contiguous */ | ||
1445 | if (!pskb_may_pull(skb, sizeof(*ddp))) | ||
1446 | goto drop; | ||
1447 | |||
1448 | ddp = ddp_hdr(skb); | ||
1449 | |||
1450 | len_hops = ntohs(ddp->deh_len_hops); | ||
1451 | |||
1452 | /* Trim buffer in case of stray trailing data */ | ||
1453 | origlen = skb->len; | ||
1454 | skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); | ||
1455 | |||
1456 | /* | ||
1457 | * Size check to see if ddp->deh_len was crap | ||
1458 | * (Otherwise we'll detonate most spectacularly | ||
1459 | * in the middle of atalk_checksum() or recvmsg()). | ||
1460 | */ | ||
1461 | if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { | ||
1462 | pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " | ||
1463 | "skb->len=%u)\n", len_hops & 1023, skb->len); | ||
1464 | goto drop; | ||
1465 | } | ||
1466 | |||
1467 | /* | ||
1468 | * Any checksums. Note we don't do htons() on this == is assumed to be | ||
1469 | * valid for net byte orders all over the networking code... | ||
1470 | */ | ||
1471 | if (ddp->deh_sum && | ||
1472 | atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum) | ||
1473 | /* Not a valid AppleTalk frame - dustbin time */ | ||
1474 | goto drop; | ||
1475 | |||
1476 | /* Check the packet is aimed at us */ | ||
1477 | if (!ddp->deh_dnet) /* Net 0 is 'this network' */ | ||
1478 | atif = atalk_find_anynet(ddp->deh_dnode, dev); | ||
1479 | else | ||
1480 | atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); | ||
1481 | |||
1482 | if (!atif) { | ||
1483 | /* Not ours, so we route the packet via the correct | ||
1484 | * AppleTalk iface | ||
1485 | */ | ||
1486 | return atalk_route_packet(skb, dev, ddp, len_hops, origlen); | ||
1487 | } | ||
1488 | |||
1489 | /* if IP over DDP is not selected this code will be optimized out */ | ||
1490 | if (is_ip_over_ddp(skb)) | ||
1491 | return handle_ip_over_ddp(skb); | ||
1492 | /* | ||
1493 | * Which socket - atalk_search_socket() looks for a *full match* | ||
1494 | * of the <net, node, port> tuple. | ||
1495 | */ | ||
1496 | tosat.sat_addr.s_net = ddp->deh_dnet; | ||
1497 | tosat.sat_addr.s_node = ddp->deh_dnode; | ||
1498 | tosat.sat_port = ddp->deh_dport; | ||
1499 | |||
1500 | sock = atalk_search_socket(&tosat, atif); | ||
1501 | if (!sock) /* But not one of our sockets */ | ||
1502 | goto drop; | ||
1503 | |||
1504 | /* Queue packet (standard) */ | ||
1505 | skb->sk = sock; | ||
1506 | |||
1507 | if (sock_queue_rcv_skb(sock, skb) < 0) | ||
1508 | goto drop; | ||
1509 | |||
1510 | return NET_RX_SUCCESS; | ||
1511 | |||
1512 | drop: | ||
1513 | kfree_skb(skb); | ||
1514 | out: | ||
1515 | return NET_RX_DROP; | ||
1516 | |||
1517 | } | ||
1518 | |||
1519 | /* | ||
1520 | * Receive a LocalTalk frame. We make some demands on the caller here. | ||
1521 | * Caller must provide enough headroom on the packet to pull the short | ||
1522 | * header and append a long one. | ||
1523 | */ | ||
1524 | static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, | ||
1525 | struct packet_type *pt, struct net_device *orig_dev) | ||
1526 | { | ||
1527 | if (!net_eq(dev_net(dev), &init_net)) | ||
1528 | goto freeit; | ||
1529 | |||
1530 | /* Expand any short form frames */ | ||
1531 | if (skb_mac_header(skb)[2] == 1) { | ||
1532 | struct ddpehdr *ddp; | ||
1533 | /* Find our address */ | ||
1534 | struct atalk_addr *ap = atalk_find_dev_addr(dev); | ||
1535 | |||
1536 | if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) | ||
1537 | goto freeit; | ||
1538 | |||
1539 | /* Don't mangle buffer if shared */ | ||
1540 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) | ||
1541 | return 0; | ||
1542 | |||
1543 | /* | ||
1544 | * The push leaves us with a ddephdr not an shdr, and | ||
1545 | * handily the port bytes in the right place preset. | ||
1546 | */ | ||
1547 | ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4); | ||
1548 | |||
1549 | /* Now fill in the long header */ | ||
1550 | |||
1551 | /* | ||
1552 | * These two first. The mac overlays the new source/dest | ||
1553 | * network information so we MUST copy these before | ||
1554 | * we write the network numbers ! | ||
1555 | */ | ||
1556 | |||
1557 | ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */ | ||
1558 | ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */ | ||
1559 | |||
1560 | ddp->deh_dnet = ap->s_net; /* Network number */ | ||
1561 | ddp->deh_snet = ap->s_net; | ||
1562 | ddp->deh_sum = 0; /* No checksum */ | ||
1563 | /* | ||
1564 | * Not sure about this bit... | ||
1565 | */ | ||
1566 | /* Non routable, so force a drop if we slip up later */ | ||
1567 | ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); | ||
1568 | } | ||
1569 | skb_reset_transport_header(skb); | ||
1570 | |||
1571 | return atalk_rcv(skb, dev, pt, orig_dev); | ||
1572 | freeit: | ||
1573 | kfree_skb(skb); | ||
1574 | return 0; | ||
1575 | } | ||
1576 | |||
1577 | static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | ||
1578 | size_t len) | ||
1579 | { | ||
1580 | struct sock *sk = sock->sk; | ||
1581 | struct atalk_sock *at = at_sk(sk); | ||
1582 | struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name; | ||
1583 | int flags = msg->msg_flags; | ||
1584 | int loopback = 0; | ||
1585 | struct sockaddr_at local_satalk, gsat; | ||
1586 | struct sk_buff *skb; | ||
1587 | struct net_device *dev; | ||
1588 | struct ddpehdr *ddp; | ||
1589 | int size; | ||
1590 | struct atalk_route *rt; | ||
1591 | int err; | ||
1592 | |||
1593 | if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) | ||
1594 | return -EINVAL; | ||
1595 | |||
1596 | if (len > DDP_MAXSZ) | ||
1597 | return -EMSGSIZE; | ||
1598 | |||
1599 | lock_kernel(); | ||
1600 | if (usat) { | ||
1601 | err = -EBUSY; | ||
1602 | if (sock_flag(sk, SOCK_ZAPPED)) | ||
1603 | if (atalk_autobind(sk) < 0) | ||
1604 | goto out; | ||
1605 | |||
1606 | err = -EINVAL; | ||
1607 | if (msg->msg_namelen < sizeof(*usat) || | ||
1608 | usat->sat_family != AF_APPLETALK) | ||
1609 | goto out; | ||
1610 | |||
1611 | err = -EPERM; | ||
1612 | /* netatalk didn't implement this check */ | ||
1613 | if (usat->sat_addr.s_node == ATADDR_BCAST && | ||
1614 | !sock_flag(sk, SOCK_BROADCAST)) { | ||
1615 | goto out; | ||
1616 | } | ||
1617 | } else { | ||
1618 | err = -ENOTCONN; | ||
1619 | if (sk->sk_state != TCP_ESTABLISHED) | ||
1620 | goto out; | ||
1621 | usat = &local_satalk; | ||
1622 | usat->sat_family = AF_APPLETALK; | ||
1623 | usat->sat_port = at->dest_port; | ||
1624 | usat->sat_addr.s_node = at->dest_node; | ||
1625 | usat->sat_addr.s_net = at->dest_net; | ||
1626 | } | ||
1627 | |||
1628 | /* Build a packet */ | ||
1629 | SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); | ||
1630 | |||
1631 | /* For headers */ | ||
1632 | size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; | ||
1633 | |||
1634 | if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { | ||
1635 | rt = atrtr_find(&usat->sat_addr); | ||
1636 | } else { | ||
1637 | struct atalk_addr at_hint; | ||
1638 | |||
1639 | at_hint.s_node = 0; | ||
1640 | at_hint.s_net = at->src_net; | ||
1641 | |||
1642 | rt = atrtr_find(&at_hint); | ||
1643 | } | ||
1644 | err = ENETUNREACH; | ||
1645 | if (!rt) | ||
1646 | goto out; | ||
1647 | |||
1648 | dev = rt->dev; | ||
1649 | |||
1650 | SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", | ||
1651 | sk, size, dev->name); | ||
1652 | |||
1653 | size += dev->hard_header_len; | ||
1654 | skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); | ||
1655 | if (!skb) | ||
1656 | goto out; | ||
1657 | |||
1658 | skb->sk = sk; | ||
1659 | skb_reserve(skb, ddp_dl->header_length); | ||
1660 | skb_reserve(skb, dev->hard_header_len); | ||
1661 | skb->dev = dev; | ||
1662 | |||
1663 | SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); | ||
1664 | |||
1665 | ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr)); | ||
1666 | ddp->deh_len_hops = htons(len + sizeof(*ddp)); | ||
1667 | ddp->deh_dnet = usat->sat_addr.s_net; | ||
1668 | ddp->deh_snet = at->src_net; | ||
1669 | ddp->deh_dnode = usat->sat_addr.s_node; | ||
1670 | ddp->deh_snode = at->src_node; | ||
1671 | ddp->deh_dport = usat->sat_port; | ||
1672 | ddp->deh_sport = at->src_port; | ||
1673 | |||
1674 | SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len); | ||
1675 | |||
1676 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | ||
1677 | if (err) { | ||
1678 | kfree_skb(skb); | ||
1679 | err = -EFAULT; | ||
1680 | goto out; | ||
1681 | } | ||
1682 | |||
1683 | if (sk->sk_no_check == 1) | ||
1684 | ddp->deh_sum = 0; | ||
1685 | else | ||
1686 | ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); | ||
1687 | |||
1688 | /* | ||
1689 | * Loopback broadcast packets to non gateway targets (ie routes | ||
1690 | * to group we are in) | ||
1691 | */ | ||
1692 | if (ddp->deh_dnode == ATADDR_BCAST && | ||
1693 | !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { | ||
1694 | struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); | ||
1695 | |||
1696 | if (skb2) { | ||
1697 | loopback = 1; | ||
1698 | SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); | ||
1699 | /* | ||
1700 | * If it fails it is queued/sent above in the aarp queue | ||
1701 | */ | ||
1702 | aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL); | ||
1703 | } | ||
1704 | } | ||
1705 | |||
1706 | if (dev->flags & IFF_LOOPBACK || loopback) { | ||
1707 | SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); | ||
1708 | /* loop back */ | ||
1709 | skb_orphan(skb); | ||
1710 | if (ddp->deh_dnode == ATADDR_BCAST) { | ||
1711 | struct atalk_addr at_lo; | ||
1712 | |||
1713 | at_lo.s_node = 0; | ||
1714 | at_lo.s_net = 0; | ||
1715 | |||
1716 | rt = atrtr_find(&at_lo); | ||
1717 | if (!rt) { | ||
1718 | kfree_skb(skb); | ||
1719 | err = -ENETUNREACH; | ||
1720 | goto out; | ||
1721 | } | ||
1722 | dev = rt->dev; | ||
1723 | skb->dev = dev; | ||
1724 | } | ||
1725 | ddp_dl->request(ddp_dl, skb, dev->dev_addr); | ||
1726 | } else { | ||
1727 | SOCK_DEBUG(sk, "SK %p: send out.\n", sk); | ||
1728 | if (rt->flags & RTF_GATEWAY) { | ||
1729 | gsat.sat_addr = rt->gateway; | ||
1730 | usat = &gsat; | ||
1731 | } | ||
1732 | |||
1733 | /* | ||
1734 | * If it fails it is queued/sent above in the aarp queue | ||
1735 | */ | ||
1736 | aarp_send_ddp(dev, skb, &usat->sat_addr, NULL); | ||
1737 | } | ||
1738 | SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len); | ||
1739 | |||
1740 | out: | ||
1741 | unlock_kernel(); | ||
1742 | return err ? : len; | ||
1743 | } | ||
1744 | |||
1745 | static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | ||
1746 | size_t size, int flags) | ||
1747 | { | ||
1748 | struct sock *sk = sock->sk; | ||
1749 | struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name; | ||
1750 | struct ddpehdr *ddp; | ||
1751 | int copied = 0; | ||
1752 | int offset = 0; | ||
1753 | int err = 0; | ||
1754 | struct sk_buff *skb; | ||
1755 | |||
1756 | lock_kernel(); | ||
1757 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | ||
1758 | flags & MSG_DONTWAIT, &err); | ||
1759 | if (!skb) | ||
1760 | goto out; | ||
1761 | |||
1762 | /* FIXME: use skb->cb to be able to use shared skbs */ | ||
1763 | ddp = ddp_hdr(skb); | ||
1764 | copied = ntohs(ddp->deh_len_hops) & 1023; | ||
1765 | |||
1766 | if (sk->sk_type != SOCK_RAW) { | ||
1767 | offset = sizeof(*ddp); | ||
1768 | copied -= offset; | ||
1769 | } | ||
1770 | |||
1771 | if (copied > size) { | ||
1772 | copied = size; | ||
1773 | msg->msg_flags |= MSG_TRUNC; | ||
1774 | } | ||
1775 | err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied); | ||
1776 | |||
1777 | if (!err) { | ||
1778 | if (sat) { | ||
1779 | sat->sat_family = AF_APPLETALK; | ||
1780 | sat->sat_port = ddp->deh_sport; | ||
1781 | sat->sat_addr.s_node = ddp->deh_snode; | ||
1782 | sat->sat_addr.s_net = ddp->deh_snet; | ||
1783 | } | ||
1784 | msg->msg_namelen = sizeof(*sat); | ||
1785 | } | ||
1786 | |||
1787 | skb_free_datagram(sk, skb); /* Free the datagram. */ | ||
1788 | |||
1789 | out: | ||
1790 | unlock_kernel(); | ||
1791 | return err ? : copied; | ||
1792 | } | ||
1793 | |||
1794 | |||
1795 | /* | ||
1796 | * AppleTalk ioctl calls. | ||
1797 | */ | ||
1798 | static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | ||
1799 | { | ||
1800 | int rc = -ENOIOCTLCMD; | ||
1801 | struct sock *sk = sock->sk; | ||
1802 | void __user *argp = (void __user *)arg; | ||
1803 | |||
1804 | switch (cmd) { | ||
1805 | /* Protocol layer */ | ||
1806 | case TIOCOUTQ: { | ||
1807 | long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | ||
1808 | |||
1809 | if (amount < 0) | ||
1810 | amount = 0; | ||
1811 | rc = put_user(amount, (int __user *)argp); | ||
1812 | break; | ||
1813 | } | ||
1814 | case TIOCINQ: { | ||
1815 | /* | ||
1816 | * These two are safe on a single CPU system as only | ||
1817 | * user tasks fiddle here | ||
1818 | */ | ||
1819 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); | ||
1820 | long amount = 0; | ||
1821 | |||
1822 | if (skb) | ||
1823 | amount = skb->len - sizeof(struct ddpehdr); | ||
1824 | rc = put_user(amount, (int __user *)argp); | ||
1825 | break; | ||
1826 | } | ||
1827 | case SIOCGSTAMP: | ||
1828 | rc = sock_get_timestamp(sk, argp); | ||
1829 | break; | ||
1830 | case SIOCGSTAMPNS: | ||
1831 | rc = sock_get_timestampns(sk, argp); | ||
1832 | break; | ||
1833 | /* Routing */ | ||
1834 | case SIOCADDRT: | ||
1835 | case SIOCDELRT: | ||
1836 | rc = -EPERM; | ||
1837 | if (capable(CAP_NET_ADMIN)) | ||
1838 | rc = atrtr_ioctl(cmd, argp); | ||
1839 | break; | ||
1840 | /* Interface */ | ||
1841 | case SIOCGIFADDR: | ||
1842 | case SIOCSIFADDR: | ||
1843 | case SIOCGIFBRDADDR: | ||
1844 | case SIOCATALKDIFADDR: | ||
1845 | case SIOCDIFADDR: | ||
1846 | case SIOCSARP: /* proxy AARP */ | ||
1847 | case SIOCDARP: /* proxy AARP */ | ||
1848 | rtnl_lock(); | ||
1849 | rc = atif_ioctl(cmd, argp); | ||
1850 | rtnl_unlock(); | ||
1851 | break; | ||
1852 | } | ||
1853 | |||
1854 | return rc; | ||
1855 | } | ||
1856 | |||
1857 | |||
1858 | #ifdef CONFIG_COMPAT | ||
1859 | static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | ||
1860 | { | ||
1861 | /* | ||
1862 | * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we | ||
1863 | * cannot handle it in common code. The data we access if ifreq | ||
1864 | * here is compatible, so we can simply call the native | ||
1865 | * handler. | ||
1866 | */ | ||
1867 | if (cmd == SIOCATALKDIFADDR) | ||
1868 | return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg)); | ||
1869 | |||
1870 | return -ENOIOCTLCMD; | ||
1871 | } | ||
1872 | #endif | ||
1873 | |||
1874 | |||
1875 | static const struct net_proto_family atalk_family_ops = { | ||
1876 | .family = PF_APPLETALK, | ||
1877 | .create = atalk_create, | ||
1878 | .owner = THIS_MODULE, | ||
1879 | }; | ||
1880 | |||
1881 | static const struct proto_ops atalk_dgram_ops = { | ||
1882 | .family = PF_APPLETALK, | ||
1883 | .owner = THIS_MODULE, | ||
1884 | .release = atalk_release, | ||
1885 | .bind = atalk_bind, | ||
1886 | .connect = atalk_connect, | ||
1887 | .socketpair = sock_no_socketpair, | ||
1888 | .accept = sock_no_accept, | ||
1889 | .getname = atalk_getname, | ||
1890 | .poll = atalk_poll, | ||
1891 | .ioctl = atalk_ioctl, | ||
1892 | #ifdef CONFIG_COMPAT | ||
1893 | .compat_ioctl = atalk_compat_ioctl, | ||
1894 | #endif | ||
1895 | .listen = sock_no_listen, | ||
1896 | .shutdown = sock_no_shutdown, | ||
1897 | .setsockopt = sock_no_setsockopt, | ||
1898 | .getsockopt = sock_no_getsockopt, | ||
1899 | .sendmsg = atalk_sendmsg, | ||
1900 | .recvmsg = atalk_recvmsg, | ||
1901 | .mmap = sock_no_mmap, | ||
1902 | .sendpage = sock_no_sendpage, | ||
1903 | }; | ||
1904 | |||
1905 | static struct notifier_block ddp_notifier = { | ||
1906 | .notifier_call = ddp_device_event, | ||
1907 | }; | ||
1908 | |||
1909 | static struct packet_type ltalk_packet_type __read_mostly = { | ||
1910 | .type = cpu_to_be16(ETH_P_LOCALTALK), | ||
1911 | .func = ltalk_rcv, | ||
1912 | }; | ||
1913 | |||
1914 | static struct packet_type ppptalk_packet_type __read_mostly = { | ||
1915 | .type = cpu_to_be16(ETH_P_PPPTALK), | ||
1916 | .func = atalk_rcv, | ||
1917 | }; | ||
1918 | |||
1919 | static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; | ||
1920 | |||
1921 | /* Export symbols for use by drivers when AppleTalk is a module */ | ||
1922 | EXPORT_SYMBOL(atrtr_get_dev); | ||
1923 | EXPORT_SYMBOL(atalk_find_dev_addr); | ||
1924 | |||
1925 | static const char atalk_err_snap[] __initconst = | ||
1926 | KERN_CRIT "Unable to register DDP with SNAP.\n"; | ||
1927 | |||
1928 | /* Called by proto.c on kernel start up */ | ||
1929 | static int __init atalk_init(void) | ||
1930 | { | ||
1931 | int rc = proto_register(&ddp_proto, 0); | ||
1932 | |||
1933 | if (rc != 0) | ||
1934 | goto out; | ||
1935 | |||
1936 | (void)sock_register(&atalk_family_ops); | ||
1937 | ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); | ||
1938 | if (!ddp_dl) | ||
1939 | printk(atalk_err_snap); | ||
1940 | |||
1941 | dev_add_pack(<alk_packet_type); | ||
1942 | dev_add_pack(&ppptalk_packet_type); | ||
1943 | |||
1944 | register_netdevice_notifier(&ddp_notifier); | ||
1945 | aarp_proto_init(); | ||
1946 | atalk_proc_init(); | ||
1947 | atalk_register_sysctl(); | ||
1948 | out: | ||
1949 | return rc; | ||
1950 | } | ||
1951 | module_init(atalk_init); | ||
1952 | |||
1953 | /* | ||
1954 | * No explicit module reference count manipulation is needed in the | ||
1955 | * protocol. Socket layer sets module reference count for us | ||
1956 | * and interfaces reference counting is done | ||
1957 | * by the network device layer. | ||
1958 | * | ||
1959 | * Ergo, before the AppleTalk module can be removed, all AppleTalk | ||
1960 | * sockets be closed from user space. | ||
1961 | */ | ||
1962 | static void __exit atalk_exit(void) | ||
1963 | { | ||
1964 | #ifdef CONFIG_SYSCTL | ||
1965 | atalk_unregister_sysctl(); | ||
1966 | #endif /* CONFIG_SYSCTL */ | ||
1967 | atalk_proc_exit(); | ||
1968 | aarp_cleanup_module(); /* General aarp clean-up. */ | ||
1969 | unregister_netdevice_notifier(&ddp_notifier); | ||
1970 | dev_remove_pack(<alk_packet_type); | ||
1971 | dev_remove_pack(&ppptalk_packet_type); | ||
1972 | unregister_snap_client(ddp_dl); | ||
1973 | sock_unregister(PF_APPLETALK); | ||
1974 | proto_unregister(&ddp_proto); | ||
1975 | } | ||
1976 | module_exit(atalk_exit); | ||
1977 | |||
1978 | MODULE_LICENSE("GPL"); | ||
1979 | MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>"); | ||
1980 | MODULE_DESCRIPTION("AppleTalk 0.20\n"); | ||
1981 | MODULE_ALIAS_NETPROTO(PF_APPLETALK); | ||