Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * DDP: An implementation of the AppleTalk DDP protocol for | |
3 | * Ethernet 'ELAP'. | |
4 | * | |
113aa838 | 5 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
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) | |
ed4477b9 | 31 | * Jay Schulist : Made work as module with |
1da177e4 LT |
32 | * AppleTalk drivers, cleaned it. |
33 | * Rob Newberry : Added proxy AARP and AARP | |
34 | * procfs, moved probing to AARP | |
35 | * module. | |
ed4477b9 YH |
36 | * Adrian Sun/ |
37 | * Michael Zuelsdorff : fix for net.0 packets. don't | |
1da177e4 | 38 | * allow illegal ether/tokentalk |
ed4477b9 YH |
39 | * port assignment. we lose a |
40 | * valid localtalk port as a | |
1da177e4 LT |
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. | |
ed4477b9 | 51 | * |
1da177e4 LT |
52 | */ |
53 | ||
4fc268d2 | 54 | #include <linux/capability.h> |
1da177e4 | 55 | #include <linux/module.h> |
1da177e4 LT |
56 | #include <linux/if_arp.h> |
57 | #include <linux/termios.h> /* For TIOCOUTQ/INQ */ | |
415ce61a | 58 | #include <linux/compat.h> |
5a0e3ad6 | 59 | #include <linux/slab.h> |
1da177e4 LT |
60 | #include <net/datalink.h> |
61 | #include <net/psnap.h> | |
62 | #include <net/sock.h> | |
c752f073 | 63 | #include <net/tcp_states.h> |
1da177e4 LT |
64 | #include <net/route.h> |
65 | #include <linux/atalk.h> | |
51c56b00 | 66 | #include <linux/highmem.h> |
1da177e4 LT |
67 | |
68 | struct datalink_proto *ddp_dl, *aarp_dl; | |
90ddc4f0 | 69 | static const struct proto_ops atalk_dgram_ops; |
1da177e4 LT |
70 | |
71 | /**************************************************************************\ | |
72 | * * | |
73 | * Handlers for the socket list. * | |
74 | * * | |
75 | \**************************************************************************/ | |
76 | ||
77 | HLIST_HEAD(atalk_sockets); | |
78 | DEFINE_RWLOCK(atalk_sockets_lock); | |
79 | ||
80 | static inline void __atalk_insert_socket(struct sock *sk) | |
81 | { | |
82 | sk_add_node(sk, &atalk_sockets); | |
83 | } | |
84 | ||
85 | static inline void atalk_remove_socket(struct sock *sk) | |
86 | { | |
87 | write_lock_bh(&atalk_sockets_lock); | |
88 | sk_del_node_init(sk); | |
89 | write_unlock_bh(&atalk_sockets_lock); | |
90 | } | |
91 | ||
92 | static struct sock *atalk_search_socket(struct sockaddr_at *to, | |
93 | struct atalk_iface *atif) | |
94 | { | |
95 | struct sock *s; | |
1da177e4 LT |
96 | |
97 | read_lock_bh(&atalk_sockets_lock); | |
b67bfe0d | 98 | sk_for_each(s, &atalk_sockets) { |
1da177e4 LT |
99 | struct atalk_sock *at = at_sk(s); |
100 | ||
101 | if (to->sat_port != at->src_port) | |
102 | continue; | |
103 | ||
ed4477b9 | 104 | if (to->sat_addr.s_net == ATADDR_ANYNET && |
64233bff | 105 | to->sat_addr.s_node == ATADDR_BCAST) |
1da177e4 LT |
106 | goto found; |
107 | ||
ed4477b9 | 108 | if (to->sat_addr.s_net == at->src_net && |
1da177e4 LT |
109 | (to->sat_addr.s_node == at->src_node || |
110 | to->sat_addr.s_node == ATADDR_BCAST || | |
111 | to->sat_addr.s_node == ATADDR_ANYNODE)) | |
112 | goto found; | |
113 | ||
ed4477b9 | 114 | /* XXXX.0 -- we got a request for this router. make sure |
1da177e4 LT |
115 | * that the node is appropriately set. */ |
116 | if (to->sat_addr.s_node == ATADDR_ANYNODE && | |
117 | to->sat_addr.s_net != ATADDR_ANYNET && | |
118 | atif->address.s_node == at->src_node) { | |
119 | to->sat_addr.s_node = atif->address.s_node; | |
120 | goto found; | |
121 | } | |
122 | } | |
123 | s = NULL; | |
124 | found: | |
125 | read_unlock_bh(&atalk_sockets_lock); | |
126 | return s; | |
127 | } | |
128 | ||
129 | /** | |
130 | * atalk_find_or_insert_socket - Try to find a socket matching ADDR | |
2c53040f BH |
131 | * @sk: socket to insert in the list if it is not there already |
132 | * @sat: address to search for | |
1da177e4 LT |
133 | * |
134 | * Try to find a socket matching ADDR in the socket list, if found then return | |
135 | * it. If not, insert SK into the socket list. | |
136 | * | |
137 | * This entire operation must execute atomically. | |
138 | */ | |
139 | static struct sock *atalk_find_or_insert_socket(struct sock *sk, | |
140 | struct sockaddr_at *sat) | |
141 | { | |
142 | struct sock *s; | |
1da177e4 LT |
143 | struct atalk_sock *at; |
144 | ||
145 | write_lock_bh(&atalk_sockets_lock); | |
b67bfe0d | 146 | sk_for_each(s, &atalk_sockets) { |
1da177e4 LT |
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. */ | |
156 | found: | |
157 | write_unlock_bh(&atalk_sockets_lock); | |
158 | return s; | |
159 | } | |
160 | ||
161 | static void atalk_destroy_timer(unsigned long data) | |
162 | { | |
163 | struct sock *sk = (struct sock *)data; | |
164 | ||
c564039f | 165 | if (sk_has_allocations(sk)) { |
1da177e4 LT |
166 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
167 | add_timer(&sk->sk_timer); | |
168 | } else | |
169 | sock_put(sk); | |
170 | } | |
171 | ||
172 | static inline void atalk_destroy_socket(struct sock *sk) | |
173 | { | |
174 | atalk_remove_socket(sk); | |
175 | skb_queue_purge(&sk->sk_receive_queue); | |
176 | ||
c564039f | 177 | if (sk_has_allocations(sk)) { |
b24b8a24 PE |
178 | setup_timer(&sk->sk_timer, atalk_destroy_timer, |
179 | (unsigned long)sk); | |
1da177e4 | 180 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
1da177e4 LT |
181 | add_timer(&sk->sk_timer); |
182 | } else | |
183 | sock_put(sk); | |
184 | } | |
185 | ||
186 | /**************************************************************************\ | |
187 | * * | |
188 | * Routing tables for the AppleTalk socket layer. * | |
189 | * * | |
190 | \**************************************************************************/ | |
191 | ||
192 | /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ | |
193 | struct atalk_route *atalk_routes; | |
194 | DEFINE_RWLOCK(atalk_routes_lock); | |
195 | ||
196 | struct atalk_iface *atalk_interfaces; | |
197 | DEFINE_RWLOCK(atalk_interfaces_lock); | |
198 | ||
199 | /* For probing devices or in a routerless network */ | |
200 | struct atalk_route atrtr_default; | |
201 | ||
202 | /* AppleTalk interface control */ | |
203 | /* | |
204 | * Drop a device. Doesn't drop any of its routes - that is the caller's | |
205 | * problem. Called when we down the interface or delete the address. | |
206 | */ | |
207 | static void atif_drop_device(struct net_device *dev) | |
208 | { | |
209 | struct atalk_iface **iface = &atalk_interfaces; | |
210 | struct atalk_iface *tmp; | |
211 | ||
212 | write_lock_bh(&atalk_interfaces_lock); | |
213 | while ((tmp = *iface) != NULL) { | |
214 | if (tmp->dev == dev) { | |
215 | *iface = tmp->next; | |
216 | dev_put(dev); | |
217 | kfree(tmp); | |
218 | dev->atalk_ptr = NULL; | |
219 | } else | |
220 | iface = &tmp->next; | |
221 | } | |
222 | write_unlock_bh(&atalk_interfaces_lock); | |
223 | } | |
224 | ||
225 | static struct atalk_iface *atif_add_device(struct net_device *dev, | |
226 | struct atalk_addr *sa) | |
227 | { | |
0da974f4 | 228 | struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); |
1da177e4 LT |
229 | |
230 | if (!iface) | |
231 | goto out; | |
232 | ||
1da177e4 LT |
233 | dev_hold(dev); |
234 | iface->dev = dev; | |
235 | dev->atalk_ptr = iface; | |
236 | iface->address = *sa; | |
237 | iface->status = 0; | |
238 | ||
239 | write_lock_bh(&atalk_interfaces_lock); | |
240 | iface->next = atalk_interfaces; | |
241 | atalk_interfaces = iface; | |
242 | write_unlock_bh(&atalk_interfaces_lock); | |
243 | out: | |
244 | return iface; | |
245 | } | |
246 | ||
247 | /* Perform phase 2 AARP probing on our tentative address */ | |
248 | static int atif_probe_device(struct atalk_iface *atif) | |
249 | { | |
250 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
251 | ntohs(atif->nets.nr_firstnet) + 1; | |
252 | int probe_net = ntohs(atif->address.s_net); | |
253 | int probe_node = atif->address.s_node; | |
254 | int netct, nodect; | |
255 | ||
256 | /* Offset the network we start probing with */ | |
257 | if (probe_net == ATADDR_ANYNET) { | |
258 | probe_net = ntohs(atif->nets.nr_firstnet); | |
259 | if (netrange) | |
260 | probe_net += jiffies % netrange; | |
261 | } | |
262 | if (probe_node == ATADDR_ANYNODE) | |
263 | probe_node = jiffies & 0xFF; | |
264 | ||
265 | /* Scan the networks */ | |
266 | atif->status |= ATIF_PROBE; | |
267 | for (netct = 0; netct <= netrange; netct++) { | |
268 | /* Sweep the available nodes from a given start */ | |
269 | atif->address.s_net = htons(probe_net); | |
270 | for (nodect = 0; nodect < 256; nodect++) { | |
271 | atif->address.s_node = (nodect + probe_node) & 0xFF; | |
272 | if (atif->address.s_node > 0 && | |
273 | atif->address.s_node < 254) { | |
274 | /* Probe a proposed address */ | |
275 | aarp_probe_network(atif); | |
276 | ||
277 | if (!(atif->status & ATIF_PROBE_FAIL)) { | |
278 | atif->status &= ~ATIF_PROBE; | |
279 | return 0; | |
280 | } | |
281 | } | |
282 | atif->status &= ~ATIF_PROBE_FAIL; | |
283 | } | |
284 | probe_net++; | |
285 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
286 | probe_net = ntohs(atif->nets.nr_firstnet); | |
287 | } | |
288 | atif->status &= ~ATIF_PROBE; | |
289 | ||
290 | return -EADDRINUSE; /* Network is full... */ | |
291 | } | |
292 | ||
293 | ||
294 | /* Perform AARP probing for a proxy address */ | |
295 | static int atif_proxy_probe_device(struct atalk_iface *atif, | |
6f0984a0 | 296 | struct atalk_addr *proxy_addr) |
1da177e4 LT |
297 | { |
298 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
299 | ntohs(atif->nets.nr_firstnet) + 1; | |
300 | /* we probe the interface's network */ | |
301 | int probe_net = ntohs(atif->address.s_net); | |
302 | int probe_node = ATADDR_ANYNODE; /* we'll take anything */ | |
303 | int netct, nodect; | |
304 | ||
305 | /* Offset the network we start probing with */ | |
306 | if (probe_net == ATADDR_ANYNET) { | |
307 | probe_net = ntohs(atif->nets.nr_firstnet); | |
308 | if (netrange) | |
309 | probe_net += jiffies % netrange; | |
310 | } | |
311 | ||
312 | if (probe_node == ATADDR_ANYNODE) | |
313 | probe_node = jiffies & 0xFF; | |
ed4477b9 | 314 | |
1da177e4 LT |
315 | /* Scan the networks */ |
316 | for (netct = 0; netct <= netrange; netct++) { | |
317 | /* Sweep the available nodes from a given start */ | |
318 | proxy_addr->s_net = htons(probe_net); | |
319 | for (nodect = 0; nodect < 256; nodect++) { | |
320 | proxy_addr->s_node = (nodect + probe_node) & 0xFF; | |
321 | if (proxy_addr->s_node > 0 && | |
322 | proxy_addr->s_node < 254) { | |
323 | /* Tell AARP to probe a proposed address */ | |
324 | int ret = aarp_proxy_probe_network(atif, | |
325 | proxy_addr); | |
326 | ||
327 | if (ret != -EADDRINUSE) | |
328 | return ret; | |
329 | } | |
330 | } | |
331 | probe_net++; | |
332 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
333 | probe_net = ntohs(atif->nets.nr_firstnet); | |
334 | } | |
335 | ||
336 | return -EADDRINUSE; /* Network is full... */ | |
337 | } | |
338 | ||
339 | ||
340 | struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) | |
341 | { | |
342 | struct atalk_iface *iface = dev->atalk_ptr; | |
343 | return iface ? &iface->address : NULL; | |
344 | } | |
345 | ||
346 | static struct atalk_addr *atalk_find_primary(void) | |
347 | { | |
348 | struct atalk_iface *fiface = NULL; | |
349 | struct atalk_addr *retval; | |
350 | struct atalk_iface *iface; | |
351 | ||
352 | /* | |
353 | * Return a point-to-point interface only if | |
354 | * there is no non-ptp interface available. | |
355 | */ | |
356 | read_lock_bh(&atalk_interfaces_lock); | |
357 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
358 | if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) | |
359 | fiface = iface; | |
360 | if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { | |
361 | retval = &iface->address; | |
362 | goto out; | |
363 | } | |
364 | } | |
365 | ||
366 | if (fiface) | |
367 | retval = &fiface->address; | |
368 | else if (atalk_interfaces) | |
369 | retval = &atalk_interfaces->address; | |
370 | else | |
371 | retval = NULL; | |
372 | out: | |
373 | read_unlock_bh(&atalk_interfaces_lock); | |
374 | return retval; | |
375 | } | |
376 | ||
377 | /* | |
378 | * Find a match for 'any network' - ie any of our interfaces with that | |
379 | * node number will do just nicely. | |
380 | */ | |
381 | static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) | |
382 | { | |
383 | struct atalk_iface *iface = dev->atalk_ptr; | |
384 | ||
385 | if (!iface || iface->status & ATIF_PROBE) | |
386 | goto out_err; | |
387 | ||
388 | if (node != ATADDR_BCAST && | |
389 | iface->address.s_node != node && | |
390 | node != ATADDR_ANYNODE) | |
391 | goto out_err; | |
392 | out: | |
393 | return iface; | |
394 | out_err: | |
395 | iface = NULL; | |
396 | goto out; | |
397 | } | |
398 | ||
399 | /* Find a match for a specific network:node pair */ | |
f6e276ee | 400 | static struct atalk_iface *atalk_find_interface(__be16 net, int node) |
1da177e4 LT |
401 | { |
402 | struct atalk_iface *iface; | |
403 | ||
404 | read_lock_bh(&atalk_interfaces_lock); | |
405 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
406 | if ((node == ATADDR_BCAST || | |
407 | node == ATADDR_ANYNODE || | |
408 | iface->address.s_node == node) && | |
409 | iface->address.s_net == net && | |
410 | !(iface->status & ATIF_PROBE)) | |
411 | break; | |
412 | ||
413 | /* XXXX.0 -- net.0 returns the iface associated with net */ | |
414 | if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && | |
415 | ntohs(iface->nets.nr_firstnet) <= ntohs(net) && | |
416 | ntohs(net) <= ntohs(iface->nets.nr_lastnet)) | |
ed4477b9 | 417 | break; |
1da177e4 LT |
418 | } |
419 | read_unlock_bh(&atalk_interfaces_lock); | |
420 | return iface; | |
421 | } | |
422 | ||
423 | ||
424 | /* | |
425 | * Find a route for an AppleTalk packet. This ought to get cached in | |
426 | * the socket (later on...). We know about host routes and the fact | |
427 | * that a route must be direct to broadcast. | |
428 | */ | |
429 | static struct atalk_route *atrtr_find(struct atalk_addr *target) | |
430 | { | |
431 | /* | |
ed4477b9 | 432 | * we must search through all routes unless we find a |
1da177e4 LT |
433 | * host route, because some host routes might overlap |
434 | * network routes | |
435 | */ | |
436 | struct atalk_route *net_route = NULL; | |
437 | struct atalk_route *r; | |
ed4477b9 | 438 | |
1da177e4 LT |
439 | read_lock_bh(&atalk_routes_lock); |
440 | for (r = atalk_routes; r; r = r->next) { | |
441 | if (!(r->flags & RTF_UP)) | |
442 | continue; | |
443 | ||
444 | if (r->target.s_net == target->s_net) { | |
445 | if (r->flags & RTF_HOST) { | |
446 | /* | |
447 | * if this host route is for the target, | |
448 | * the we're done | |
449 | */ | |
450 | if (r->target.s_node == target->s_node) | |
451 | goto out; | |
452 | } else | |
453 | /* | |
454 | * this route will work if there isn't a | |
455 | * direct host route, so cache it | |
456 | */ | |
457 | net_route = r; | |
458 | } | |
459 | } | |
ed4477b9 YH |
460 | |
461 | /* | |
1da177e4 LT |
462 | * if we found a network route but not a direct host |
463 | * route, then return it | |
464 | */ | |
465 | if (net_route) | |
466 | r = net_route; | |
467 | else if (atrtr_default.dev) | |
468 | r = &atrtr_default; | |
469 | else /* No route can be found */ | |
470 | r = NULL; | |
471 | out: | |
472 | read_unlock_bh(&atalk_routes_lock); | |
473 | return r; | |
474 | } | |
475 | ||
476 | ||
477 | /* | |
478 | * Given an AppleTalk network, find the device to use. This can be | |
479 | * a simple lookup. | |
480 | */ | |
481 | struct net_device *atrtr_get_dev(struct atalk_addr *sa) | |
482 | { | |
483 | struct atalk_route *atr = atrtr_find(sa); | |
484 | return atr ? atr->dev : NULL; | |
485 | } | |
486 | ||
487 | /* Set up a default router */ | |
488 | static void atrtr_set_default(struct net_device *dev) | |
489 | { | |
490 | atrtr_default.dev = dev; | |
491 | atrtr_default.flags = RTF_UP; | |
492 | atrtr_default.gateway.s_net = htons(0); | |
493 | atrtr_default.gateway.s_node = 0; | |
494 | } | |
495 | ||
496 | /* | |
497 | * Add a router. Basically make sure it looks valid and stuff the | |
498 | * entry in the list. While it uses netranges we always set them to one | |
499 | * entry to work like netatalk. | |
500 | */ | |
501 | static int atrtr_create(struct rtentry *r, struct net_device *devhint) | |
502 | { | |
503 | struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; | |
504 | struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; | |
505 | struct atalk_route *rt; | |
506 | struct atalk_iface *iface, *riface; | |
507 | int retval = -EINVAL; | |
508 | ||
509 | /* | |
510 | * Fixme: Raise/Lower a routing change semaphore for these | |
511 | * operations. | |
512 | */ | |
513 | ||
514 | /* Validate the request */ | |
515 | if (ta->sat_family != AF_APPLETALK || | |
516 | (!devhint && ga->sat_family != AF_APPLETALK)) | |
517 | goto out; | |
518 | ||
519 | /* Now walk the routing table and make our decisions */ | |
520 | write_lock_bh(&atalk_routes_lock); | |
521 | for (rt = atalk_routes; rt; rt = rt->next) { | |
522 | if (r->rt_flags != rt->flags) | |
523 | continue; | |
524 | ||
525 | if (ta->sat_addr.s_net == rt->target.s_net) { | |
526 | if (!(rt->flags & RTF_HOST)) | |
527 | break; | |
528 | if (ta->sat_addr.s_node == rt->target.s_node) | |
529 | break; | |
530 | } | |
531 | } | |
532 | ||
533 | if (!devhint) { | |
534 | riface = NULL; | |
535 | ||
536 | read_lock_bh(&atalk_interfaces_lock); | |
537 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
538 | if (!riface && | |
539 | ntohs(ga->sat_addr.s_net) >= | |
ed4477b9 | 540 | ntohs(iface->nets.nr_firstnet) && |
1da177e4 | 541 | ntohs(ga->sat_addr.s_net) <= |
ed4477b9 | 542 | ntohs(iface->nets.nr_lastnet)) |
1da177e4 LT |
543 | riface = iface; |
544 | ||
545 | if (ga->sat_addr.s_net == iface->address.s_net && | |
546 | ga->sat_addr.s_node == iface->address.s_node) | |
547 | riface = iface; | |
ed4477b9 | 548 | } |
1da177e4 LT |
549 | read_unlock_bh(&atalk_interfaces_lock); |
550 | ||
551 | retval = -ENETUNREACH; | |
552 | if (!riface) | |
553 | goto out_unlock; | |
554 | ||
555 | devhint = riface->dev; | |
556 | } | |
557 | ||
558 | if (!rt) { | |
0da974f4 | 559 | rt = kzalloc(sizeof(*rt), GFP_ATOMIC); |
1da177e4 LT |
560 | |
561 | retval = -ENOBUFS; | |
562 | if (!rt) | |
563 | goto out_unlock; | |
1da177e4 LT |
564 | |
565 | rt->next = atalk_routes; | |
566 | atalk_routes = rt; | |
567 | } | |
568 | ||
569 | /* Fill in the routing entry */ | |
570 | rt->target = ta->sat_addr; | |
c7f905f0 | 571 | dev_hold(devhint); |
1da177e4 LT |
572 | rt->dev = devhint; |
573 | rt->flags = r->rt_flags; | |
574 | rt->gateway = ga->sat_addr; | |
575 | ||
576 | retval = 0; | |
577 | out_unlock: | |
578 | write_unlock_bh(&atalk_routes_lock); | |
579 | out: | |
580 | return retval; | |
581 | } | |
582 | ||
583 | /* Delete a route. Find it and discard it */ | |
6f0984a0 | 584 | static int atrtr_delete(struct atalk_addr *addr) |
1da177e4 LT |
585 | { |
586 | struct atalk_route **r = &atalk_routes; | |
587 | int retval = 0; | |
588 | struct atalk_route *tmp; | |
589 | ||
590 | write_lock_bh(&atalk_routes_lock); | |
591 | while ((tmp = *r) != NULL) { | |
592 | if (tmp->target.s_net == addr->s_net && | |
593 | (!(tmp->flags&RTF_GATEWAY) || | |
594 | tmp->target.s_node == addr->s_node)) { | |
595 | *r = tmp->next; | |
596 | dev_put(tmp->dev); | |
597 | kfree(tmp); | |
598 | goto out; | |
599 | } | |
600 | r = &tmp->next; | |
601 | } | |
602 | retval = -ENOENT; | |
603 | out: | |
604 | write_unlock_bh(&atalk_routes_lock); | |
605 | return retval; | |
606 | } | |
607 | ||
608 | /* | |
609 | * Called when a device is downed. Just throw away any routes | |
610 | * via it. | |
611 | */ | |
612 | static void atrtr_device_down(struct net_device *dev) | |
613 | { | |
614 | struct atalk_route **r = &atalk_routes; | |
615 | struct atalk_route *tmp; | |
616 | ||
617 | write_lock_bh(&atalk_routes_lock); | |
618 | while ((tmp = *r) != NULL) { | |
619 | if (tmp->dev == dev) { | |
620 | *r = tmp->next; | |
621 | dev_put(dev); | |
622 | kfree(tmp); | |
623 | } else | |
624 | r = &tmp->next; | |
625 | } | |
626 | write_unlock_bh(&atalk_routes_lock); | |
627 | ||
628 | if (atrtr_default.dev == dev) | |
629 | atrtr_set_default(NULL); | |
630 | } | |
631 | ||
632 | /* Actually down the interface */ | |
633 | static inline void atalk_dev_down(struct net_device *dev) | |
634 | { | |
635 | atrtr_device_down(dev); /* Remove all routes for the device */ | |
636 | aarp_device_down(dev); /* Remove AARP entries for the device */ | |
637 | atif_drop_device(dev); /* Remove the device */ | |
638 | } | |
639 | ||
640 | /* | |
641 | * A device event has occurred. Watch for devices going down and | |
642 | * delete our use of them (iface and route). | |
643 | */ | |
644 | static int ddp_device_event(struct notifier_block *this, unsigned long event, | |
645 | void *ptr) | |
646 | { | |
351638e7 | 647 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
890d52d3 | 648 | |
721499e8 | 649 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
650 | return NOTIFY_DONE; |
651 | ||
1da177e4 LT |
652 | if (event == NETDEV_DOWN) |
653 | /* Discard any use of this */ | |
890d52d3 | 654 | atalk_dev_down(dev); |
1da177e4 LT |
655 | |
656 | return NOTIFY_DONE; | |
657 | } | |
658 | ||
659 | /* ioctl calls. Shouldn't even need touching */ | |
660 | /* Device configuration ioctl calls */ | |
661 | static int atif_ioctl(int cmd, void __user *arg) | |
662 | { | |
663 | static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; | |
664 | struct ifreq atreq; | |
665 | struct atalk_netrange *nr; | |
666 | struct sockaddr_at *sa; | |
667 | struct net_device *dev; | |
668 | struct atalk_iface *atif; | |
669 | int ct; | |
670 | int limit; | |
671 | struct rtentry rtdef; | |
672 | int add_route; | |
673 | ||
674 | if (copy_from_user(&atreq, arg, sizeof(atreq))) | |
675 | return -EFAULT; | |
676 | ||
881d966b | 677 | dev = __dev_get_by_name(&init_net, atreq.ifr_name); |
1da177e4 LT |
678 | if (!dev) |
679 | return -ENODEV; | |
680 | ||
681 | sa = (struct sockaddr_at *)&atreq.ifr_addr; | |
682 | atif = atalk_find_dev(dev); | |
683 | ||
684 | switch (cmd) { | |
4a9e4b09 JP |
685 | case SIOCSIFADDR: |
686 | if (!capable(CAP_NET_ADMIN)) | |
687 | return -EPERM; | |
688 | if (sa->sat_family != AF_APPLETALK) | |
689 | return -EINVAL; | |
690 | if (dev->type != ARPHRD_ETHER && | |
691 | dev->type != ARPHRD_LOOPBACK && | |
692 | dev->type != ARPHRD_LOCALTLK && | |
693 | dev->type != ARPHRD_PPP) | |
694 | return -EPROTONOSUPPORT; | |
695 | ||
696 | nr = (struct atalk_netrange *)&sa->sat_zero[0]; | |
697 | add_route = 1; | |
698 | ||
699 | /* | |
700 | * if this is a point-to-point iface, and we already | |
701 | * have an iface for this AppleTalk address, then we | |
702 | * should not add a route | |
703 | */ | |
704 | if ((dev->flags & IFF_POINTOPOINT) && | |
705 | atalk_find_interface(sa->sat_addr.s_net, | |
706 | sa->sat_addr.s_node)) { | |
707 | printk(KERN_DEBUG "AppleTalk: point-to-point " | |
708 | "interface added with " | |
709 | "existing address\n"); | |
710 | add_route = 0; | |
711 | } | |
1da177e4 | 712 | |
4a9e4b09 JP |
713 | /* |
714 | * Phase 1 is fine on LocalTalk but we don't do | |
715 | * EtherTalk phase 1. Anyone wanting to add it go ahead. | |
716 | */ | |
717 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
718 | return -EPROTONOSUPPORT; | |
719 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
720 | sa->sat_addr.s_node == 254) | |
721 | return -EINVAL; | |
722 | if (atif) { | |
723 | /* Already setting address */ | |
724 | if (atif->status & ATIF_PROBE) | |
725 | return -EBUSY; | |
726 | ||
727 | atif->address.s_net = sa->sat_addr.s_net; | |
728 | atif->address.s_node = sa->sat_addr.s_node; | |
729 | atrtr_device_down(dev); /* Flush old routes */ | |
730 | } else { | |
731 | atif = atif_add_device(dev, &sa->sat_addr); | |
1da177e4 | 732 | if (!atif) |
4a9e4b09 JP |
733 | return -ENOMEM; |
734 | } | |
735 | atif->nets = *nr; | |
736 | ||
737 | /* | |
738 | * Check if the chosen address is used. If so we | |
739 | * error and atalkd will try another. | |
740 | */ | |
741 | ||
742 | if (!(dev->flags & IFF_LOOPBACK) && | |
743 | !(dev->flags & IFF_POINTOPOINT) && | |
744 | atif_probe_device(atif) < 0) { | |
745 | atif_drop_device(dev); | |
746 | return -EADDRINUSE; | |
747 | } | |
1da177e4 | 748 | |
4a9e4b09 JP |
749 | /* Hey it worked - add the direct routes */ |
750 | sa = (struct sockaddr_at *)&rtdef.rt_gateway; | |
751 | sa->sat_family = AF_APPLETALK; | |
752 | sa->sat_addr.s_net = atif->address.s_net; | |
753 | sa->sat_addr.s_node = atif->address.s_node; | |
754 | sa = (struct sockaddr_at *)&rtdef.rt_dst; | |
755 | rtdef.rt_flags = RTF_UP; | |
756 | sa->sat_family = AF_APPLETALK; | |
757 | sa->sat_addr.s_node = ATADDR_ANYNODE; | |
758 | if (dev->flags & IFF_LOOPBACK || | |
759 | dev->flags & IFF_POINTOPOINT) | |
760 | rtdef.rt_flags |= RTF_HOST; | |
761 | ||
762 | /* Routerless initial state */ | |
763 | if (nr->nr_firstnet == htons(0) && | |
764 | nr->nr_lastnet == htons(0xFFFE)) { | |
1da177e4 | 765 | sa->sat_addr.s_net = atif->address.s_net; |
4a9e4b09 JP |
766 | atrtr_create(&rtdef, dev); |
767 | atrtr_set_default(dev); | |
768 | } else { | |
769 | limit = ntohs(nr->nr_lastnet); | |
770 | if (limit - ntohs(nr->nr_firstnet) > 4096) { | |
771 | printk(KERN_WARNING "Too many routes/" | |
772 | "iface.\n"); | |
1da177e4 | 773 | return -EINVAL; |
4a9e4b09 JP |
774 | } |
775 | if (add_route) | |
776 | for (ct = ntohs(nr->nr_firstnet); | |
777 | ct <= limit; ct++) { | |
778 | sa->sat_addr.s_net = htons(ct); | |
779 | atrtr_create(&rtdef, dev); | |
780 | } | |
781 | } | |
782 | dev_mc_add_global(dev, aarp_mcast); | |
783 | return 0; | |
784 | ||
785 | case SIOCGIFADDR: | |
786 | if (!atif) | |
787 | return -EADDRNOTAVAIL; | |
788 | ||
789 | sa->sat_family = AF_APPLETALK; | |
790 | sa->sat_addr = atif->address; | |
791 | break; | |
792 | ||
793 | case SIOCGIFBRDADDR: | |
794 | if (!atif) | |
795 | return -EADDRNOTAVAIL; | |
796 | ||
797 | sa->sat_family = AF_APPLETALK; | |
798 | sa->sat_addr.s_net = atif->address.s_net; | |
799 | sa->sat_addr.s_node = ATADDR_BCAST; | |
800 | break; | |
801 | ||
802 | case SIOCATALKDIFADDR: | |
803 | case SIOCDIFADDR: | |
804 | if (!capable(CAP_NET_ADMIN)) | |
805 | return -EPERM; | |
806 | if (sa->sat_family != AF_APPLETALK) | |
807 | return -EINVAL; | |
808 | atalk_dev_down(dev); | |
809 | break; | |
810 | ||
811 | case SIOCSARP: | |
812 | if (!capable(CAP_NET_ADMIN)) | |
813 | return -EPERM; | |
814 | if (sa->sat_family != AF_APPLETALK) | |
815 | return -EINVAL; | |
816 | /* | |
817 | * for now, we only support proxy AARP on ELAP; | |
818 | * we should be able to do it for LocalTalk, too. | |
819 | */ | |
820 | if (dev->type != ARPHRD_ETHER) | |
821 | return -EPROTONOSUPPORT; | |
822 | ||
823 | /* | |
824 | * atif points to the current interface on this network; | |
825 | * we aren't concerned about its current status (at | |
826 | * least for now), but it has all the settings about | |
827 | * the network we're going to probe. Consequently, it | |
828 | * must exist. | |
829 | */ | |
830 | if (!atif) | |
831 | return -EADDRNOTAVAIL; | |
832 | ||
833 | nr = (struct atalk_netrange *)&(atif->nets); | |
834 | /* | |
835 | * Phase 1 is fine on Localtalk but we don't do | |
836 | * Ethertalk phase 1. Anyone wanting to add it go ahead. | |
837 | */ | |
838 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
839 | return -EPROTONOSUPPORT; | |
840 | ||
841 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
842 | sa->sat_addr.s_node == 254) | |
843 | return -EINVAL; | |
844 | ||
845 | /* | |
846 | * Check if the chosen address is used. If so we | |
847 | * error and ATCP will try another. | |
848 | */ | |
849 | if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) | |
850 | return -EADDRINUSE; | |
851 | ||
852 | /* | |
853 | * We now have an address on the local network, and | |
854 | * the AARP code will defend it for us until we take it | |
855 | * down. We don't set up any routes right now, because | |
856 | * ATCP will install them manually via SIOCADDRT. | |
857 | */ | |
858 | break; | |
859 | ||
860 | case SIOCDARP: | |
861 | if (!capable(CAP_NET_ADMIN)) | |
862 | return -EPERM; | |
863 | if (sa->sat_family != AF_APPLETALK) | |
864 | return -EINVAL; | |
865 | if (!atif) | |
866 | return -EADDRNOTAVAIL; | |
867 | ||
868 | /* give to aarp module to remove proxy entry */ | |
869 | aarp_proxy_remove(atif->dev, &(sa->sat_addr)); | |
870 | return 0; | |
1da177e4 LT |
871 | } |
872 | ||
873 | return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; | |
874 | } | |
875 | ||
876 | /* Routing ioctl() calls */ | |
877 | static int atrtr_ioctl(unsigned int cmd, void __user *arg) | |
878 | { | |
879 | struct rtentry rt; | |
880 | ||
881 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
882 | return -EFAULT; | |
883 | ||
884 | switch (cmd) { | |
4a9e4b09 JP |
885 | case SIOCDELRT: |
886 | if (rt.rt_dst.sa_family != AF_APPLETALK) | |
887 | return -EINVAL; | |
888 | return atrtr_delete(&((struct sockaddr_at *) | |
889 | &rt.rt_dst)->sat_addr); | |
890 | ||
891 | case SIOCADDRT: { | |
892 | struct net_device *dev = NULL; | |
893 | if (rt.rt_dev) { | |
894 | char name[IFNAMSIZ]; | |
895 | if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1)) | |
896 | return -EFAULT; | |
897 | name[IFNAMSIZ-1] = '\0'; | |
898 | dev = __dev_get_by_name(&init_net, name); | |
899 | if (!dev) | |
900 | return -ENODEV; | |
1da177e4 | 901 | } |
4a9e4b09 JP |
902 | return atrtr_create(&rt, dev); |
903 | } | |
1da177e4 LT |
904 | } |
905 | return -EINVAL; | |
906 | } | |
907 | ||
908 | /**************************************************************************\ | |
909 | * * | |
910 | * Handling for system calls applied via the various interfaces to an * | |
911 | * AppleTalk socket object. * | |
912 | * * | |
913 | \**************************************************************************/ | |
914 | ||
915 | /* | |
916 | * Checksum: This is 'optional'. It's quite likely also a good | |
917 | * candidate for assembler hackery 8) | |
918 | */ | |
ed4477b9 | 919 | static unsigned long atalk_sum_partial(const unsigned char *data, |
1da177e4 LT |
920 | int len, unsigned long sum) |
921 | { | |
922 | /* This ought to be unwrapped neatly. I'll trust gcc for now */ | |
923 | while (len--) { | |
f7a3a1d8 JP |
924 | sum += *data++; |
925 | sum = rol16(sum, 1); | |
1da177e4 LT |
926 | } |
927 | return sum; | |
928 | } | |
929 | ||
930 | /* Checksum skb data -- similar to skb_checksum */ | |
931 | static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, | |
932 | int len, unsigned long sum) | |
933 | { | |
1a028e50 | 934 | int start = skb_headlen(skb); |
c32ba3f9 | 935 | struct sk_buff *frag_iter; |
1da177e4 LT |
936 | int i, copy; |
937 | ||
938 | /* checksum stuff in header space */ | |
fd1dc261 | 939 | if ((copy = start - offset) > 0) { |
1da177e4 LT |
940 | if (copy > len) |
941 | copy = len; | |
942 | sum = atalk_sum_partial(skb->data + offset, copy, sum); | |
fd1dc261 | 943 | if ((len -= copy) == 0) |
1da177e4 LT |
944 | return sum; |
945 | ||
946 | offset += copy; | |
947 | } | |
948 | ||
949 | /* checksum stuff in frags */ | |
950 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1a028e50 | 951 | int end; |
9e903e08 | 952 | const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
547b792c | 953 | WARN_ON(start > offset + len); |
1a028e50 | 954 | |
9e903e08 | 955 | end = start + skb_frag_size(frag); |
1da177e4 LT |
956 | if ((copy = end - offset) > 0) { |
957 | u8 *vaddr; | |
1da177e4 LT |
958 | |
959 | if (copy > len) | |
960 | copy = len; | |
51c56b00 | 961 | vaddr = kmap_atomic(skb_frag_page(frag)); |
1a028e50 DM |
962 | sum = atalk_sum_partial(vaddr + frag->page_offset + |
963 | offset - start, copy, sum); | |
51c56b00 | 964 | kunmap_atomic(vaddr); |
1da177e4 LT |
965 | |
966 | if (!(len -= copy)) | |
967 | return sum; | |
968 | offset += copy; | |
969 | } | |
1a028e50 | 970 | start = end; |
1da177e4 LT |
971 | } |
972 | ||
c32ba3f9 DM |
973 | skb_walk_frags(skb, frag_iter) { |
974 | int end; | |
1a028e50 | 975 | |
c32ba3f9 | 976 | WARN_ON(start > offset + len); |
1da177e4 | 977 | |
c32ba3f9 DM |
978 | end = start + frag_iter->len; |
979 | if ((copy = end - offset) > 0) { | |
980 | if (copy > len) | |
981 | copy = len; | |
982 | sum = atalk_sum_skb(frag_iter, offset - start, | |
983 | copy, sum); | |
984 | if ((len -= copy) == 0) | |
985 | return sum; | |
986 | offset += copy; | |
1da177e4 | 987 | } |
c32ba3f9 | 988 | start = end; |
1da177e4 LT |
989 | } |
990 | ||
991 | BUG_ON(len > 0); | |
992 | ||
993 | return sum; | |
994 | } | |
995 | ||
2a50f28c | 996 | static __be16 atalk_checksum(const struct sk_buff *skb, int len) |
1da177e4 LT |
997 | { |
998 | unsigned long sum; | |
999 | ||
1000 | /* skip header 4 bytes */ | |
1001 | sum = atalk_sum_skb(skb, 4, len-4, 0); | |
1002 | ||
1003 | /* Use 0xFFFF for 0. 0 itself means none */ | |
2a50f28c | 1004 | return sum ? htons((unsigned short)sum) : htons(0xFFFF); |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | static struct proto ddp_proto = { | |
1008 | .name = "DDP", | |
1009 | .owner = THIS_MODULE, | |
1010 | .obj_size = sizeof(struct atalk_sock), | |
1011 | }; | |
1012 | ||
1013 | /* | |
1014 | * Create a socket. Initialise the socket, blank the addresses | |
1015 | * set the state. | |
1016 | */ | |
3f378b68 EP |
1017 | static int atalk_create(struct net *net, struct socket *sock, int protocol, |
1018 | int kern) | |
1da177e4 LT |
1019 | { |
1020 | struct sock *sk; | |
1021 | int rc = -ESOCKTNOSUPPORT; | |
1022 | ||
09ad9bc7 | 1023 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
1024 | return -EAFNOSUPPORT; |
1025 | ||
1da177e4 LT |
1026 | /* |
1027 | * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do | |
ed4477b9 | 1028 | * and gives you the full ELAP frame. Should be handy for CAP 8) |
1da177e4 LT |
1029 | */ |
1030 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) | |
1031 | goto out; | |
1032 | rc = -ENOMEM; | |
11aa9c28 | 1033 | sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, kern); |
1da177e4 LT |
1034 | if (!sk) |
1035 | goto out; | |
1036 | rc = 0; | |
1037 | sock->ops = &atalk_dgram_ops; | |
1038 | sock_init_data(sock, sk); | |
1039 | ||
1040 | /* Checksums on by default */ | |
1041 | sock_set_flag(sk, SOCK_ZAPPED); | |
1042 | out: | |
1043 | return rc; | |
1044 | } | |
1045 | ||
1046 | /* Free a socket. No work needed */ | |
1047 | static int atalk_release(struct socket *sock) | |
1048 | { | |
1049 | struct sock *sk = sock->sk; | |
1050 | ||
1051 | if (sk) { | |
c100c8f4 DM |
1052 | sock_hold(sk); |
1053 | lock_sock(sk); | |
1054 | ||
1da177e4 LT |
1055 | sock_orphan(sk); |
1056 | sock->sk = NULL; | |
1057 | atalk_destroy_socket(sk); | |
b20e7bbf | 1058 | |
c100c8f4 DM |
1059 | release_sock(sk); |
1060 | sock_put(sk); | |
1061 | } | |
1da177e4 LT |
1062 | return 0; |
1063 | } | |
1064 | ||
1065 | /** | |
1066 | * atalk_pick_and_bind_port - Pick a source port when one is not given | |
2c53040f BH |
1067 | * @sk: socket to insert into the tables |
1068 | * @sat: address to search for | |
1da177e4 LT |
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; | |
1da177e4 | 1085 | |
b67bfe0d | 1086 | sk_for_each(s, &atalk_sockets) { |
1da177e4 LT |
1087 | struct atalk_sock *at = at_sk(s); |
1088 | ||
1089 | if (at->src_net == sat->sat_addr.s_net && | |
1090 | at->src_node == sat->sat_addr.s_node && | |
1091 | at->src_port == sat->sat_port) | |
1092 | goto try_next_port; | |
1093 | } | |
1094 | ||
1095 | /* Wheee, it's free, assign and insert. */ | |
1096 | __atalk_insert_socket(sk); | |
1097 | at_sk(sk)->src_port = sat->sat_port; | |
1098 | retval = 0; | |
1099 | goto out; | |
1100 | ||
1101 | try_next_port:; | |
1102 | } | |
1103 | ||
1104 | retval = -EBUSY; | |
1105 | out: | |
1106 | write_unlock_bh(&atalk_sockets_lock); | |
1107 | return retval; | |
1108 | } | |
1109 | ||
1110 | static int atalk_autobind(struct sock *sk) | |
1111 | { | |
1112 | struct atalk_sock *at = at_sk(sk); | |
1113 | struct sockaddr_at sat; | |
1114 | struct atalk_addr *ap = atalk_find_primary(); | |
1115 | int n = -EADDRNOTAVAIL; | |
1116 | ||
1117 | if (!ap || ap->s_net == htons(ATADDR_ANYNET)) | |
1118 | goto out; | |
1119 | ||
1120 | at->src_net = sat.sat_addr.s_net = ap->s_net; | |
1121 | at->src_node = sat.sat_addr.s_node = ap->s_node; | |
1122 | ||
1123 | n = atalk_pick_and_bind_port(sk, &sat); | |
1124 | if (!n) | |
1125 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1126 | out: | |
1127 | return n; | |
1128 | } | |
1129 | ||
1130 | /* Set the address 'our end' of the connection */ | |
1131 | static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1132 | { | |
1133 | struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; | |
1134 | struct sock *sk = sock->sk; | |
1135 | struct atalk_sock *at = at_sk(sk); | |
ecced8ba | 1136 | int err; |
1da177e4 LT |
1137 | |
1138 | if (!sock_flag(sk, SOCK_ZAPPED) || | |
1139 | addr_len != sizeof(struct sockaddr_at)) | |
1140 | return -EINVAL; | |
1141 | ||
1142 | if (addr->sat_family != AF_APPLETALK) | |
1143 | return -EAFNOSUPPORT; | |
1144 | ||
60d9f461 | 1145 | lock_sock(sk); |
1da177e4 LT |
1146 | if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { |
1147 | struct atalk_addr *ap = atalk_find_primary(); | |
1148 | ||
ecced8ba | 1149 | err = -EADDRNOTAVAIL; |
1da177e4 | 1150 | if (!ap) |
ecced8ba | 1151 | goto out; |
1da177e4 LT |
1152 | |
1153 | at->src_net = addr->sat_addr.s_net = ap->s_net; | |
fd1dc261 | 1154 | at->src_node = addr->sat_addr.s_node = ap->s_node; |
1da177e4 | 1155 | } else { |
ecced8ba | 1156 | err = -EADDRNOTAVAIL; |
1da177e4 LT |
1157 | if (!atalk_find_interface(addr->sat_addr.s_net, |
1158 | addr->sat_addr.s_node)) | |
ecced8ba | 1159 | goto out; |
1da177e4 LT |
1160 | |
1161 | at->src_net = addr->sat_addr.s_net; | |
1162 | at->src_node = addr->sat_addr.s_node; | |
1163 | } | |
1164 | ||
1165 | if (addr->sat_port == ATADDR_ANYPORT) { | |
ecced8ba | 1166 | err = atalk_pick_and_bind_port(sk, addr); |
1da177e4 | 1167 | |
ecced8ba AB |
1168 | if (err < 0) |
1169 | goto out; | |
1da177e4 LT |
1170 | } else { |
1171 | at->src_port = addr->sat_port; | |
1172 | ||
ecced8ba | 1173 | err = -EADDRINUSE; |
1da177e4 | 1174 | if (atalk_find_or_insert_socket(sk, addr)) |
ecced8ba | 1175 | goto out; |
1da177e4 LT |
1176 | } |
1177 | ||
1178 | sock_reset_flag(sk, SOCK_ZAPPED); | |
ecced8ba AB |
1179 | err = 0; |
1180 | out: | |
60d9f461 | 1181 | release_sock(sk); |
ecced8ba | 1182 | return err; |
1da177e4 LT |
1183 | } |
1184 | ||
1185 | /* Set the address we talk to */ | |
1186 | static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, | |
1187 | int addr_len, int flags) | |
1188 | { | |
1189 | struct sock *sk = sock->sk; | |
1190 | struct atalk_sock *at = at_sk(sk); | |
1191 | struct sockaddr_at *addr; | |
ecced8ba | 1192 | int err; |
1da177e4 LT |
1193 | |
1194 | sk->sk_state = TCP_CLOSE; | |
1195 | sock->state = SS_UNCONNECTED; | |
1196 | ||
1197 | if (addr_len != sizeof(*addr)) | |
1198 | return -EINVAL; | |
1199 | ||
1200 | addr = (struct sockaddr_at *)uaddr; | |
1201 | ||
1202 | if (addr->sat_family != AF_APPLETALK) | |
1203 | return -EAFNOSUPPORT; | |
1204 | ||
1205 | if (addr->sat_addr.s_node == ATADDR_BCAST && | |
1206 | !sock_flag(sk, SOCK_BROADCAST)) { | |
ed4477b9 | 1207 | #if 1 |
278f015e | 1208 | pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n", |
1da177e4 LT |
1209 | current->comm); |
1210 | #else | |
1211 | return -EACCES; | |
ed4477b9 | 1212 | #endif |
1da177e4 LT |
1213 | } |
1214 | ||
60d9f461 | 1215 | lock_sock(sk); |
ecced8ba | 1216 | err = -EBUSY; |
1da177e4 LT |
1217 | if (sock_flag(sk, SOCK_ZAPPED)) |
1218 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1219 | goto out; |
1da177e4 | 1220 | |
ecced8ba | 1221 | err = -ENETUNREACH; |
1da177e4 | 1222 | if (!atrtr_get_dev(&addr->sat_addr)) |
ecced8ba | 1223 | goto out; |
1da177e4 LT |
1224 | |
1225 | at->dest_port = addr->sat_port; | |
1226 | at->dest_net = addr->sat_addr.s_net; | |
1227 | at->dest_node = addr->sat_addr.s_node; | |
1228 | ||
1229 | sock->state = SS_CONNECTED; | |
1230 | sk->sk_state = TCP_ESTABLISHED; | |
ecced8ba AB |
1231 | err = 0; |
1232 | out: | |
60d9f461 | 1233 | release_sock(sk); |
ecced8ba | 1234 | return err; |
1da177e4 LT |
1235 | } |
1236 | ||
1237 | /* | |
1238 | * Find the name of an AppleTalk socket. Just copy the right | |
1239 | * fields into the sockaddr. | |
1240 | */ | |
1241 | static int atalk_getname(struct socket *sock, struct sockaddr *uaddr, | |
1242 | int *uaddr_len, int peer) | |
1243 | { | |
1244 | struct sockaddr_at sat; | |
1245 | struct sock *sk = sock->sk; | |
1246 | struct atalk_sock *at = at_sk(sk); | |
ecced8ba | 1247 | int err; |
1da177e4 | 1248 | |
60d9f461 | 1249 | lock_sock(sk); |
ecced8ba | 1250 | err = -ENOBUFS; |
1da177e4 LT |
1251 | if (sock_flag(sk, SOCK_ZAPPED)) |
1252 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1253 | goto out; |
1da177e4 LT |
1254 | |
1255 | *uaddr_len = sizeof(struct sockaddr_at); | |
fccc9f1f | 1256 | memset(&sat, 0, sizeof(sat)); |
1da177e4 LT |
1257 | |
1258 | if (peer) { | |
ecced8ba | 1259 | err = -ENOTCONN; |
1da177e4 | 1260 | if (sk->sk_state != TCP_ESTABLISHED) |
ecced8ba | 1261 | goto out; |
1da177e4 LT |
1262 | |
1263 | sat.sat_addr.s_net = at->dest_net; | |
1264 | sat.sat_addr.s_node = at->dest_node; | |
1265 | sat.sat_port = at->dest_port; | |
1266 | } else { | |
1267 | sat.sat_addr.s_net = at->src_net; | |
1268 | sat.sat_addr.s_node = at->src_node; | |
1269 | sat.sat_port = at->src_port; | |
1270 | } | |
1271 | ||
ecced8ba | 1272 | err = 0; |
1da177e4 LT |
1273 | sat.sat_family = AF_APPLETALK; |
1274 | memcpy(uaddr, &sat, sizeof(sat)); | |
ecced8ba AB |
1275 | |
1276 | out: | |
60d9f461 | 1277 | release_sock(sk); |
ecced8ba | 1278 | return err; |
1da177e4 LT |
1279 | } |
1280 | ||
1281 | #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE) | |
1282 | static __inline__ int is_ip_over_ddp(struct sk_buff *skb) | |
1283 | { | |
ed4477b9 | 1284 | return skb->data[12] == 22; |
1da177e4 LT |
1285 | } |
1286 | ||
1287 | static int handle_ip_over_ddp(struct sk_buff *skb) | |
1288 | { | |
881d966b | 1289 | struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0"); |
1da177e4 LT |
1290 | struct net_device_stats *stats; |
1291 | ||
1292 | /* This needs to be able to handle ipddp"N" devices */ | |
ffcfb8db ACM |
1293 | if (!dev) { |
1294 | kfree_skb(skb); | |
1295 | return NET_RX_DROP; | |
1296 | } | |
1da177e4 | 1297 | |
ed4477b9 YH |
1298 | skb->protocol = htons(ETH_P_IP); |
1299 | skb_pull(skb, 13); | |
1300 | skb->dev = dev; | |
badff6d0 | 1301 | skb_reset_transport_header(skb); |
1da177e4 | 1302 | |
524ad0a7 | 1303 | stats = netdev_priv(dev); |
ed4477b9 YH |
1304 | stats->rx_packets++; |
1305 | stats->rx_bytes += skb->len + 13; | |
ffcfb8db | 1306 | return netif_rx(skb); /* Send the SKB up to a higher place. */ |
1da177e4 LT |
1307 | } |
1308 | #else | |
1309 | /* make it easy for gcc to optimize this test out, i.e. kill the code */ | |
1310 | #define is_ip_over_ddp(skb) 0 | |
1311 | #define handle_ip_over_ddp(skb) 0 | |
1312 | #endif | |
1313 | ||
ffcfb8db ACM |
1314 | static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev, |
1315 | struct ddpehdr *ddp, __u16 len_hops, int origlen) | |
1da177e4 LT |
1316 | { |
1317 | struct atalk_route *rt; | |
1318 | struct atalk_addr ta; | |
1319 | ||
1320 | /* | |
1321 | * Don't route multicast, etc., packets, or packets sent to "this | |
ed4477b9 | 1322 | * network" |
1da177e4 LT |
1323 | */ |
1324 | if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { | |
1325 | /* | |
1326 | * FIXME: | |
1327 | * | |
1328 | * Can it ever happen that a packet is from a PPP iface and | |
1329 | * needs to be broadcast onto the default network? | |
1330 | */ | |
1331 | if (dev->type == ARPHRD_PPP) | |
1332 | printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " | |
1333 | "packet received from PPP iface\n"); | |
1334 | goto free_it; | |
1335 | } | |
1336 | ||
1337 | ta.s_net = ddp->deh_dnet; | |
1338 | ta.s_node = ddp->deh_dnode; | |
1339 | ||
1340 | /* Route the packet */ | |
1341 | rt = atrtr_find(&ta); | |
2a50f28c AV |
1342 | /* increment hops count */ |
1343 | len_hops += 1 << 10; | |
1344 | if (!rt || !(len_hops & (15 << 10))) | |
1da177e4 | 1345 | goto free_it; |
2a50f28c | 1346 | |
1da177e4 | 1347 | /* FIXME: use skb->cb to be able to use shared skbs */ |
1da177e4 LT |
1348 | |
1349 | /* | |
1350 | * Route goes through another gateway, so set the target to the | |
1351 | * gateway instead. | |
1352 | */ | |
1353 | ||
1354 | if (rt->flags & RTF_GATEWAY) { | |
1355 | ta.s_net = rt->gateway.s_net; | |
1356 | ta.s_node = rt->gateway.s_node; | |
1357 | } | |
1358 | ||
ed4477b9 YH |
1359 | /* Fix up skb->len field */ |
1360 | skb_trim(skb, min_t(unsigned int, origlen, | |
1da177e4 | 1361 | (rt->dev->hard_header_len + |
2a50f28c | 1362 | ddp_dl->header_length + (len_hops & 1023)))); |
1da177e4 | 1363 | |
1da177e4 | 1364 | /* FIXME: use skb->cb to be able to use shared skbs */ |
2a50f28c | 1365 | ddp->deh_len_hops = htons(len_hops); |
1da177e4 LT |
1366 | |
1367 | /* | |
1368 | * Send the buffer onwards | |
1369 | * | |
1370 | * Now we must always be careful. If it's come from LocalTalk to | |
1371 | * EtherTalk it might not fit | |
1372 | * | |
1373 | * Order matters here: If a packet has to be copied to make a new | |
1374 | * headroom (rare hopefully) then it won't need unsharing. | |
1375 | * | |
1376 | * Note. ddp-> becomes invalid at the realloc. | |
1377 | */ | |
1378 | if (skb_headroom(skb) < 22) { | |
1379 | /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ | |
1380 | struct sk_buff *nskb = skb_realloc_headroom(skb, 32); | |
1381 | kfree_skb(skb); | |
1da177e4 LT |
1382 | skb = nskb; |
1383 | } else | |
1384 | skb = skb_unshare(skb, GFP_ATOMIC); | |
ed4477b9 | 1385 | |
1da177e4 LT |
1386 | /* |
1387 | * If the buffer didn't vanish into the lack of space bitbucket we can | |
1388 | * send it. | |
1389 | */ | |
ffcfb8db ACM |
1390 | if (skb == NULL) |
1391 | goto drop; | |
1392 | ||
1393 | if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP) | |
1394 | return NET_RX_DROP; | |
8be8057e | 1395 | return NET_RX_SUCCESS; |
1da177e4 LT |
1396 | free_it: |
1397 | kfree_skb(skb); | |
ffcfb8db ACM |
1398 | drop: |
1399 | return NET_RX_DROP; | |
1da177e4 LT |
1400 | } |
1401 | ||
1402 | /** | |
1403 | * atalk_rcv - Receive a packet (in skb) from device dev | |
1404 | * @skb - packet received | |
1405 | * @dev - network device where the packet comes from | |
1406 | * @pt - packet type | |
1407 | * | |
1408 | * Receive a packet (in skb) from device dev. This has come from the SNAP | |
b0e380b1 ACM |
1409 | * decoder, and on entry skb->transport_header is the DDP header, skb->len |
1410 | * is the DDP header, skb->len is the DDP length. The physical headers | |
1411 | * have been extracted. PPP should probably pass frames marked as for this | |
1412 | * layer. [ie ARPHRD_ETHERTALK] | |
1da177e4 LT |
1413 | */ |
1414 | static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1415 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
1416 | { |
1417 | struct ddpehdr *ddp; | |
1418 | struct sock *sock; | |
1419 | struct atalk_iface *atif; | |
1420 | struct sockaddr_at tosat; | |
ed4477b9 | 1421 | int origlen; |
2a50f28c | 1422 | __u16 len_hops; |
1da177e4 | 1423 | |
721499e8 | 1424 | if (!net_eq(dev_net(dev), &init_net)) |
6885ffb3 | 1425 | goto drop; |
e730c155 | 1426 | |
1da177e4 | 1427 | /* Don't mangle buffer if shared */ |
ed4477b9 | 1428 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 | 1429 | goto out; |
ed4477b9 | 1430 | |
1da177e4 LT |
1431 | /* Size check and make sure header is contiguous */ |
1432 | if (!pskb_may_pull(skb, sizeof(*ddp))) | |
6885ffb3 | 1433 | goto drop; |
1da177e4 LT |
1434 | |
1435 | ddp = ddp_hdr(skb); | |
1436 | ||
2a50f28c | 1437 | len_hops = ntohs(ddp->deh_len_hops); |
1da177e4 LT |
1438 | |
1439 | /* Trim buffer in case of stray trailing data */ | |
1440 | origlen = skb->len; | |
2a50f28c | 1441 | skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); |
1da177e4 LT |
1442 | |
1443 | /* | |
1444 | * Size check to see if ddp->deh_len was crap | |
1445 | * (Otherwise we'll detonate most spectacularly | |
75559c16 | 1446 | * in the middle of atalk_checksum() or recvmsg()). |
1da177e4 | 1447 | */ |
75559c16 JD |
1448 | if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { |
1449 | pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " | |
1450 | "skb->len=%u)\n", len_hops & 1023, skb->len); | |
6885ffb3 | 1451 | goto drop; |
75559c16 | 1452 | } |
1da177e4 LT |
1453 | |
1454 | /* | |
1455 | * Any checksums. Note we don't do htons() on this == is assumed to be | |
1456 | * valid for net byte orders all over the networking code... | |
1457 | */ | |
1458 | if (ddp->deh_sum && | |
2a50f28c | 1459 | atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum) |
1da177e4 | 1460 | /* Not a valid AppleTalk frame - dustbin time */ |
6885ffb3 | 1461 | goto drop; |
1da177e4 LT |
1462 | |
1463 | /* Check the packet is aimed at us */ | |
1464 | if (!ddp->deh_dnet) /* Net 0 is 'this network' */ | |
1465 | atif = atalk_find_anynet(ddp->deh_dnode, dev); | |
1466 | else | |
1467 | atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); | |
1468 | ||
1da177e4 | 1469 | if (!atif) { |
64233bff OD |
1470 | /* Not ours, so we route the packet via the correct |
1471 | * AppleTalk iface | |
1472 | */ | |
ffcfb8db | 1473 | return atalk_route_packet(skb, dev, ddp, len_hops, origlen); |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | /* if IP over DDP is not selected this code will be optimized out */ | |
1477 | if (is_ip_over_ddp(skb)) | |
1478 | return handle_ip_over_ddp(skb); | |
1479 | /* | |
1480 | * Which socket - atalk_search_socket() looks for a *full match* | |
1481 | * of the <net, node, port> tuple. | |
1482 | */ | |
1483 | tosat.sat_addr.s_net = ddp->deh_dnet; | |
1484 | tosat.sat_addr.s_node = ddp->deh_dnode; | |
1485 | tosat.sat_port = ddp->deh_dport; | |
1486 | ||
1487 | sock = atalk_search_socket(&tosat, atif); | |
1488 | if (!sock) /* But not one of our sockets */ | |
6885ffb3 | 1489 | goto drop; |
1da177e4 LT |
1490 | |
1491 | /* Queue packet (standard) */ | |
1da177e4 | 1492 | if (sock_queue_rcv_skb(sock, skb) < 0) |
6885ffb3 MS |
1493 | goto drop; |
1494 | ||
1495 | return NET_RX_SUCCESS; | |
1496 | ||
1497 | drop: | |
1da177e4 | 1498 | kfree_skb(skb); |
6885ffb3 MS |
1499 | out: |
1500 | return NET_RX_DROP; | |
1501 | ||
1da177e4 LT |
1502 | } |
1503 | ||
1504 | /* | |
1505 | * Receive a LocalTalk frame. We make some demands on the caller here. | |
1506 | * Caller must provide enough headroom on the packet to pull the short | |
1507 | * header and append a long one. | |
1508 | */ | |
1509 | static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1510 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 | 1511 | { |
721499e8 | 1512 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
1513 | goto freeit; |
1514 | ||
1da177e4 | 1515 | /* Expand any short form frames */ |
98e399f8 | 1516 | if (skb_mac_header(skb)[2] == 1) { |
1da177e4 LT |
1517 | struct ddpehdr *ddp; |
1518 | /* Find our address */ | |
1519 | struct atalk_addr *ap = atalk_find_dev_addr(dev); | |
1520 | ||
2a50f28c | 1521 | if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) |
1da177e4 LT |
1522 | goto freeit; |
1523 | ||
1524 | /* Don't mangle buffer if shared */ | |
ed4477b9 | 1525 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 LT |
1526 | return 0; |
1527 | ||
1528 | /* | |
1529 | * The push leaves us with a ddephdr not an shdr, and | |
1530 | * handily the port bytes in the right place preset. | |
1531 | */ | |
1532 | ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4); | |
1533 | ||
1534 | /* Now fill in the long header */ | |
1535 | ||
ed4477b9 YH |
1536 | /* |
1537 | * These two first. The mac overlays the new source/dest | |
1538 | * network information so we MUST copy these before | |
1539 | * we write the network numbers ! | |
1540 | */ | |
1da177e4 | 1541 | |
98e399f8 ACM |
1542 | ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */ |
1543 | ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */ | |
1da177e4 LT |
1544 | |
1545 | ddp->deh_dnet = ap->s_net; /* Network number */ | |
1546 | ddp->deh_snet = ap->s_net; | |
1547 | ddp->deh_sum = 0; /* No checksum */ | |
1548 | /* | |
1549 | * Not sure about this bit... | |
1550 | */ | |
2a50f28c AV |
1551 | /* Non routable, so force a drop if we slip up later */ |
1552 | ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); | |
1da177e4 | 1553 | } |
badff6d0 | 1554 | skb_reset_transport_header(skb); |
1da177e4 | 1555 | |
f2ccd8fa | 1556 | return atalk_rcv(skb, dev, pt, orig_dev); |
1da177e4 LT |
1557 | freeit: |
1558 | kfree_skb(skb); | |
1559 | return 0; | |
1560 | } | |
1561 | ||
1b784140 | 1562 | static int atalk_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
1563 | { |
1564 | struct sock *sk = sock->sk; | |
1565 | struct atalk_sock *at = at_sk(sk); | |
342dfc30 | 1566 | DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name); |
1da177e4 LT |
1567 | int flags = msg->msg_flags; |
1568 | int loopback = 0; | |
1569 | struct sockaddr_at local_satalk, gsat; | |
1570 | struct sk_buff *skb; | |
1571 | struct net_device *dev; | |
1572 | struct ddpehdr *ddp; | |
1573 | int size; | |
1574 | struct atalk_route *rt; | |
1575 | int err; | |
1576 | ||
1577 | if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) | |
1578 | return -EINVAL; | |
1579 | ||
1580 | if (len > DDP_MAXSZ) | |
1581 | return -EMSGSIZE; | |
1582 | ||
60d9f461 | 1583 | lock_sock(sk); |
1da177e4 | 1584 | if (usat) { |
ecced8ba | 1585 | err = -EBUSY; |
1da177e4 LT |
1586 | if (sock_flag(sk, SOCK_ZAPPED)) |
1587 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1588 | goto out; |
1da177e4 | 1589 | |
ecced8ba | 1590 | err = -EINVAL; |
1da177e4 LT |
1591 | if (msg->msg_namelen < sizeof(*usat) || |
1592 | usat->sat_family != AF_APPLETALK) | |
ecced8ba | 1593 | goto out; |
1da177e4 | 1594 | |
ecced8ba | 1595 | err = -EPERM; |
03ba9991 | 1596 | /* netatalk didn't implement this check */ |
1da177e4 LT |
1597 | if (usat->sat_addr.s_node == ATADDR_BCAST && |
1598 | !sock_flag(sk, SOCK_BROADCAST)) { | |
ecced8ba | 1599 | goto out; |
1da177e4 LT |
1600 | } |
1601 | } else { | |
ecced8ba | 1602 | err = -ENOTCONN; |
1da177e4 | 1603 | if (sk->sk_state != TCP_ESTABLISHED) |
ecced8ba | 1604 | goto out; |
1da177e4 LT |
1605 | usat = &local_satalk; |
1606 | usat->sat_family = AF_APPLETALK; | |
1607 | usat->sat_port = at->dest_port; | |
1608 | usat->sat_addr.s_node = at->dest_node; | |
1609 | usat->sat_addr.s_net = at->dest_net; | |
1610 | } | |
1611 | ||
1612 | /* Build a packet */ | |
1613 | SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); | |
1614 | ||
1615 | /* For headers */ | |
1616 | size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; | |
1617 | ||
1618 | if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { | |
1619 | rt = atrtr_find(&usat->sat_addr); | |
1da177e4 LT |
1620 | } else { |
1621 | struct atalk_addr at_hint; | |
1622 | ||
1623 | at_hint.s_node = 0; | |
1624 | at_hint.s_net = at->src_net; | |
1625 | ||
1626 | rt = atrtr_find(&at_hint); | |
1da177e4 | 1627 | } |
ecced8ba | 1628 | err = ENETUNREACH; |
64233bff | 1629 | if (!rt) |
ecced8ba | 1630 | goto out; |
64233bff OD |
1631 | |
1632 | dev = rt->dev; | |
1da177e4 LT |
1633 | |
1634 | SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", | |
1635 | sk, size, dev->name); | |
1636 | ||
1637 | size += dev->hard_header_len; | |
60d9f461 | 1638 | release_sock(sk); |
1da177e4 | 1639 | skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); |
60d9f461 | 1640 | lock_sock(sk); |
1da177e4 | 1641 | if (!skb) |
ecced8ba | 1642 | goto out; |
ed4477b9 | 1643 | |
1da177e4 LT |
1644 | skb_reserve(skb, ddp_dl->header_length); |
1645 | skb_reserve(skb, dev->hard_header_len); | |
1646 | skb->dev = dev; | |
1647 | ||
1648 | SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); | |
1649 | ||
1650 | ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr)); | |
2a50f28c | 1651 | ddp->deh_len_hops = htons(len + sizeof(*ddp)); |
1da177e4 LT |
1652 | ddp->deh_dnet = usat->sat_addr.s_net; |
1653 | ddp->deh_snet = at->src_net; | |
1654 | ddp->deh_dnode = usat->sat_addr.s_node; | |
1655 | ddp->deh_snode = at->src_node; | |
1656 | ddp->deh_dport = usat->sat_port; | |
1657 | ddp->deh_sport = at->src_port; | |
1658 | ||
1659 | SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len); | |
1660 | ||
6ce8e9ce | 1661 | err = memcpy_from_msg(skb_put(skb, len), msg, len); |
1da177e4 LT |
1662 | if (err) { |
1663 | kfree_skb(skb); | |
ecced8ba AB |
1664 | err = -EFAULT; |
1665 | goto out; | |
1da177e4 LT |
1666 | } |
1667 | ||
28448b80 | 1668 | if (sk->sk_no_check_tx) |
1da177e4 LT |
1669 | ddp->deh_sum = 0; |
1670 | else | |
1671 | ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); | |
1672 | ||
1673 | /* | |
1674 | * Loopback broadcast packets to non gateway targets (ie routes | |
1675 | * to group we are in) | |
1676 | */ | |
1677 | if (ddp->deh_dnode == ATADDR_BCAST && | |
1678 | !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { | |
1679 | struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); | |
1680 | ||
1681 | if (skb2) { | |
1682 | loopback = 1; | |
1683 | SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); | |
ffcfb8db ACM |
1684 | /* |
1685 | * If it fails it is queued/sent above in the aarp queue | |
1686 | */ | |
1687 | aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL); | |
1da177e4 LT |
1688 | } |
1689 | } | |
1690 | ||
1691 | if (dev->flags & IFF_LOOPBACK || loopback) { | |
1692 | SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); | |
1693 | /* loop back */ | |
1694 | skb_orphan(skb); | |
64233bff OD |
1695 | if (ddp->deh_dnode == ATADDR_BCAST) { |
1696 | struct atalk_addr at_lo; | |
1697 | ||
1698 | at_lo.s_node = 0; | |
1699 | at_lo.s_net = 0; | |
1700 | ||
1701 | rt = atrtr_find(&at_lo); | |
1702 | if (!rt) { | |
1703 | kfree_skb(skb); | |
ecced8ba AB |
1704 | err = -ENETUNREACH; |
1705 | goto out; | |
64233bff OD |
1706 | } |
1707 | dev = rt->dev; | |
1708 | skb->dev = dev; | |
1709 | } | |
1da177e4 LT |
1710 | ddp_dl->request(ddp_dl, skb, dev->dev_addr); |
1711 | } else { | |
1712 | SOCK_DEBUG(sk, "SK %p: send out.\n", sk); | |
1713 | if (rt->flags & RTF_GATEWAY) { | |
1714 | gsat.sat_addr = rt->gateway; | |
1715 | usat = &gsat; | |
1716 | } | |
1717 | ||
ffcfb8db ACM |
1718 | /* |
1719 | * If it fails it is queued/sent above in the aarp queue | |
1720 | */ | |
1721 | aarp_send_ddp(dev, skb, &usat->sat_addr, NULL); | |
1da177e4 LT |
1722 | } |
1723 | SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len); | |
1724 | ||
ecced8ba | 1725 | out: |
60d9f461 | 1726 | release_sock(sk); |
ecced8ba | 1727 | return err ? : len; |
1da177e4 LT |
1728 | } |
1729 | ||
1b784140 YX |
1730 | static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1731 | int flags) | |
1da177e4 LT |
1732 | { |
1733 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1734 | struct ddpehdr *ddp; |
1735 | int copied = 0; | |
2a50f28c | 1736 | int offset = 0; |
1da177e4 | 1737 | int err = 0; |
ecced8ba AB |
1738 | struct sk_buff *skb; |
1739 | ||
ecced8ba | 1740 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
1da177e4 | 1741 | flags & MSG_DONTWAIT, &err); |
60d9f461 AB |
1742 | lock_sock(sk); |
1743 | ||
1da177e4 | 1744 | if (!skb) |
ecced8ba | 1745 | goto out; |
1da177e4 LT |
1746 | |
1747 | /* FIXME: use skb->cb to be able to use shared skbs */ | |
1748 | ddp = ddp_hdr(skb); | |
2a50f28c | 1749 | copied = ntohs(ddp->deh_len_hops) & 1023; |
1da177e4 | 1750 | |
2a50f28c AV |
1751 | if (sk->sk_type != SOCK_RAW) { |
1752 | offset = sizeof(*ddp); | |
1753 | copied -= offset; | |
1754 | } | |
1da177e4 | 1755 | |
2a50f28c AV |
1756 | if (copied > size) { |
1757 | copied = size; | |
1758 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 | 1759 | } |
51f3d02b | 1760 | err = skb_copy_datagram_msg(skb, offset, msg, copied); |
1da177e4 | 1761 | |
f3d33426 | 1762 | if (!err && msg->msg_name) { |
342dfc30 | 1763 | DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name); |
f3d33426 HFS |
1764 | sat->sat_family = AF_APPLETALK; |
1765 | sat->sat_port = ddp->deh_sport; | |
1766 | sat->sat_addr.s_node = ddp->deh_snode; | |
1767 | sat->sat_addr.s_net = ddp->deh_snet; | |
1768 | msg->msg_namelen = sizeof(*sat); | |
1da177e4 LT |
1769 | } |
1770 | ||
1771 | skb_free_datagram(sk, skb); /* Free the datagram. */ | |
ecced8ba AB |
1772 | |
1773 | out: | |
60d9f461 | 1774 | release_sock(sk); |
1da177e4 LT |
1775 | return err ? : copied; |
1776 | } | |
1777 | ||
1778 | ||
1779 | /* | |
1780 | * AppleTalk ioctl calls. | |
1781 | */ | |
1782 | static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1783 | { | |
b5e5fa5e | 1784 | int rc = -ENOIOCTLCMD; |
1da177e4 LT |
1785 | struct sock *sk = sock->sk; |
1786 | void __user *argp = (void __user *)arg; | |
1787 | ||
1788 | switch (cmd) { | |
7b30600c | 1789 | /* Protocol layer */ |
1790 | case TIOCOUTQ: { | |
1791 | long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
1da177e4 | 1792 | |
7b30600c | 1793 | if (amount < 0) |
1794 | amount = 0; | |
1795 | rc = put_user(amount, (int __user *)argp); | |
1796 | break; | |
1797 | } | |
1798 | case TIOCINQ: { | |
1799 | /* | |
1800 | * These two are safe on a single CPU system as only | |
1801 | * user tasks fiddle here | |
1802 | */ | |
1803 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); | |
1804 | long amount = 0; | |
1da177e4 | 1805 | |
7b30600c | 1806 | if (skb) |
63ae8894 | 1807 | amount = skb->len - sizeof(struct ddpehdr); |
7b30600c | 1808 | rc = put_user(amount, (int __user *)argp); |
1809 | break; | |
1810 | } | |
1811 | case SIOCGSTAMP: | |
1812 | rc = sock_get_timestamp(sk, argp); | |
1813 | break; | |
1814 | case SIOCGSTAMPNS: | |
1815 | rc = sock_get_timestampns(sk, argp); | |
1816 | break; | |
1817 | /* Routing */ | |
1818 | case SIOCADDRT: | |
1819 | case SIOCDELRT: | |
1820 | rc = -EPERM; | |
1821 | if (capable(CAP_NET_ADMIN)) | |
1822 | rc = atrtr_ioctl(cmd, argp); | |
1823 | break; | |
1824 | /* Interface */ | |
1825 | case SIOCGIFADDR: | |
1826 | case SIOCSIFADDR: | |
1827 | case SIOCGIFBRDADDR: | |
1828 | case SIOCATALKDIFADDR: | |
1829 | case SIOCDIFADDR: | |
1830 | case SIOCSARP: /* proxy AARP */ | |
1831 | case SIOCDARP: /* proxy AARP */ | |
1832 | rtnl_lock(); | |
1833 | rc = atif_ioctl(cmd, argp); | |
1834 | rtnl_unlock(); | |
1835 | break; | |
1da177e4 LT |
1836 | } |
1837 | ||
1838 | return rc; | |
1839 | } | |
1840 | ||
f6c90b71 PV |
1841 | |
1842 | #ifdef CONFIG_COMPAT | |
1843 | static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1844 | { | |
1845 | /* | |
20660221 AB |
1846 | * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we |
1847 | * cannot handle it in common code. The data we access if ifreq | |
1848 | * here is compatible, so we can simply call the native | |
1849 | * handler. | |
f6c90b71 | 1850 | */ |
20660221 AB |
1851 | if (cmd == SIOCATALKDIFADDR) |
1852 | return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg)); | |
1853 | ||
f6c90b71 PV |
1854 | return -ENOIOCTLCMD; |
1855 | } | |
1856 | #endif | |
1857 | ||
1858 | ||
ec1b4cf7 | 1859 | static const struct net_proto_family atalk_family_ops = { |
1da177e4 LT |
1860 | .family = PF_APPLETALK, |
1861 | .create = atalk_create, | |
1862 | .owner = THIS_MODULE, | |
1863 | }; | |
1864 | ||
ecced8ba | 1865 | static const struct proto_ops atalk_dgram_ops = { |
1da177e4 LT |
1866 | .family = PF_APPLETALK, |
1867 | .owner = THIS_MODULE, | |
1868 | .release = atalk_release, | |
1869 | .bind = atalk_bind, | |
1870 | .connect = atalk_connect, | |
1871 | .socketpair = sock_no_socketpair, | |
1872 | .accept = sock_no_accept, | |
1873 | .getname = atalk_getname, | |
60d9f461 | 1874 | .poll = datagram_poll, |
1da177e4 | 1875 | .ioctl = atalk_ioctl, |
f6c90b71 PV |
1876 | #ifdef CONFIG_COMPAT |
1877 | .compat_ioctl = atalk_compat_ioctl, | |
1878 | #endif | |
1da177e4 LT |
1879 | .listen = sock_no_listen, |
1880 | .shutdown = sock_no_shutdown, | |
1881 | .setsockopt = sock_no_setsockopt, | |
1882 | .getsockopt = sock_no_getsockopt, | |
1883 | .sendmsg = atalk_sendmsg, | |
1884 | .recvmsg = atalk_recvmsg, | |
1885 | .mmap = sock_no_mmap, | |
1886 | .sendpage = sock_no_sendpage, | |
1887 | }; | |
1888 | ||
1da177e4 LT |
1889 | static struct notifier_block ddp_notifier = { |
1890 | .notifier_call = ddp_device_event, | |
1891 | }; | |
1892 | ||
7546dd97 | 1893 | static struct packet_type ltalk_packet_type __read_mostly = { |
09640e63 | 1894 | .type = cpu_to_be16(ETH_P_LOCALTALK), |
1da177e4 LT |
1895 | .func = ltalk_rcv, |
1896 | }; | |
1897 | ||
7546dd97 | 1898 | static struct packet_type ppptalk_packet_type __read_mostly = { |
09640e63 | 1899 | .type = cpu_to_be16(ETH_P_PPPTALK), |
1da177e4 LT |
1900 | .func = atalk_rcv, |
1901 | }; | |
1902 | ||
1903 | static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; | |
1904 | ||
1905 | /* Export symbols for use by drivers when AppleTalk is a module */ | |
1da177e4 LT |
1906 | EXPORT_SYMBOL(atrtr_get_dev); |
1907 | EXPORT_SYMBOL(atalk_find_dev_addr); | |
1908 | ||
2db09608 | 1909 | static const char atalk_err_snap[] __initconst = |
1da177e4 LT |
1910 | KERN_CRIT "Unable to register DDP with SNAP.\n"; |
1911 | ||
1912 | /* Called by proto.c on kernel start up */ | |
1913 | static int __init atalk_init(void) | |
1914 | { | |
1915 | int rc = proto_register(&ddp_proto, 0); | |
1916 | ||
1917 | if (rc != 0) | |
1918 | goto out; | |
1919 | ||
1920 | (void)sock_register(&atalk_family_ops); | |
1921 | ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); | |
1922 | if (!ddp_dl) | |
1923 | printk(atalk_err_snap); | |
1924 | ||
1925 | dev_add_pack(<alk_packet_type); | |
1926 | dev_add_pack(&ppptalk_packet_type); | |
1927 | ||
1928 | register_netdevice_notifier(&ddp_notifier); | |
1929 | aarp_proto_init(); | |
1930 | atalk_proc_init(); | |
1931 | atalk_register_sysctl(); | |
1932 | out: | |
1933 | return rc; | |
1934 | } | |
1935 | module_init(atalk_init); | |
1936 | ||
1937 | /* | |
1938 | * No explicit module reference count manipulation is needed in the | |
1939 | * protocol. Socket layer sets module reference count for us | |
1940 | * and interfaces reference counting is done | |
1941 | * by the network device layer. | |
1942 | * | |
1943 | * Ergo, before the AppleTalk module can be removed, all AppleTalk | |
1944 | * sockets be closed from user space. | |
1945 | */ | |
1946 | static void __exit atalk_exit(void) | |
1947 | { | |
1948 | #ifdef CONFIG_SYSCTL | |
1949 | atalk_unregister_sysctl(); | |
1950 | #endif /* CONFIG_SYSCTL */ | |
1951 | atalk_proc_exit(); | |
1952 | aarp_cleanup_module(); /* General aarp clean-up. */ | |
1953 | unregister_netdevice_notifier(&ddp_notifier); | |
1954 | dev_remove_pack(<alk_packet_type); | |
1955 | dev_remove_pack(&ppptalk_packet_type); | |
1956 | unregister_snap_client(ddp_dl); | |
1957 | sock_unregister(PF_APPLETALK); | |
1958 | proto_unregister(&ddp_proto); | |
1959 | } | |
1960 | module_exit(atalk_exit); | |
1961 | ||
1962 | MODULE_LICENSE("GPL"); | |
113aa838 | 1963 | MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>"); |
1da177e4 LT |
1964 | MODULE_DESCRIPTION("AppleTalk 0.20\n"); |
1965 | MODULE_ALIAS_NETPROTO(PF_APPLETALK); |