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; | |
96 | struct hlist_node *node; | |
97 | ||
98 | read_lock_bh(&atalk_sockets_lock); | |
99 | sk_for_each(s, node, &atalk_sockets) { | |
100 | struct atalk_sock *at = at_sk(s); | |
101 | ||
102 | if (to->sat_port != at->src_port) | |
103 | continue; | |
104 | ||
ed4477b9 | 105 | if (to->sat_addr.s_net == ATADDR_ANYNET && |
64233bff | 106 | to->sat_addr.s_node == ATADDR_BCAST) |
1da177e4 LT |
107 | goto found; |
108 | ||
ed4477b9 | 109 | if (to->sat_addr.s_net == at->src_net && |
1da177e4 LT |
110 | (to->sat_addr.s_node == at->src_node || |
111 | to->sat_addr.s_node == ATADDR_BCAST || | |
112 | to->sat_addr.s_node == ATADDR_ANYNODE)) | |
113 | goto found; | |
114 | ||
ed4477b9 | 115 | /* XXXX.0 -- we got a request for this router. make sure |
1da177e4 LT |
116 | * that the node is appropriately set. */ |
117 | if (to->sat_addr.s_node == ATADDR_ANYNODE && | |
118 | to->sat_addr.s_net != ATADDR_ANYNET && | |
119 | atif->address.s_node == at->src_node) { | |
120 | to->sat_addr.s_node = atif->address.s_node; | |
121 | goto found; | |
122 | } | |
123 | } | |
124 | s = NULL; | |
125 | found: | |
126 | read_unlock_bh(&atalk_sockets_lock); | |
127 | return s; | |
128 | } | |
129 | ||
130 | /** | |
131 | * atalk_find_or_insert_socket - Try to find a socket matching ADDR | |
132 | * @sk - socket to insert in the list if it is not there already | |
133 | * @sat - address to search for | |
134 | * | |
135 | * Try to find a socket matching ADDR in the socket list, if found then return | |
136 | * it. If not, insert SK into the socket list. | |
137 | * | |
138 | * This entire operation must execute atomically. | |
139 | */ | |
140 | static struct sock *atalk_find_or_insert_socket(struct sock *sk, | |
141 | struct sockaddr_at *sat) | |
142 | { | |
143 | struct sock *s; | |
144 | struct hlist_node *node; | |
145 | struct atalk_sock *at; | |
146 | ||
147 | write_lock_bh(&atalk_sockets_lock); | |
148 | sk_for_each(s, node, &atalk_sockets) { | |
149 | at = at_sk(s); | |
150 | ||
151 | if (at->src_net == sat->sat_addr.s_net && | |
152 | at->src_node == sat->sat_addr.s_node && | |
153 | at->src_port == sat->sat_port) | |
154 | goto found; | |
155 | } | |
156 | s = NULL; | |
157 | __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */ | |
158 | found: | |
159 | write_unlock_bh(&atalk_sockets_lock); | |
160 | return s; | |
161 | } | |
162 | ||
163 | static void atalk_destroy_timer(unsigned long data) | |
164 | { | |
165 | struct sock *sk = (struct sock *)data; | |
166 | ||
c564039f | 167 | if (sk_has_allocations(sk)) { |
1da177e4 LT |
168 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
169 | add_timer(&sk->sk_timer); | |
170 | } else | |
171 | sock_put(sk); | |
172 | } | |
173 | ||
174 | static inline void atalk_destroy_socket(struct sock *sk) | |
175 | { | |
176 | atalk_remove_socket(sk); | |
177 | skb_queue_purge(&sk->sk_receive_queue); | |
178 | ||
c564039f | 179 | if (sk_has_allocations(sk)) { |
b24b8a24 PE |
180 | setup_timer(&sk->sk_timer, atalk_destroy_timer, |
181 | (unsigned long)sk); | |
1da177e4 | 182 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
1da177e4 LT |
183 | add_timer(&sk->sk_timer); |
184 | } else | |
185 | sock_put(sk); | |
186 | } | |
187 | ||
188 | /**************************************************************************\ | |
189 | * * | |
190 | * Routing tables for the AppleTalk socket layer. * | |
191 | * * | |
192 | \**************************************************************************/ | |
193 | ||
194 | /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ | |
195 | struct atalk_route *atalk_routes; | |
196 | DEFINE_RWLOCK(atalk_routes_lock); | |
197 | ||
198 | struct atalk_iface *atalk_interfaces; | |
199 | DEFINE_RWLOCK(atalk_interfaces_lock); | |
200 | ||
201 | /* For probing devices or in a routerless network */ | |
202 | struct atalk_route atrtr_default; | |
203 | ||
204 | /* AppleTalk interface control */ | |
205 | /* | |
206 | * Drop a device. Doesn't drop any of its routes - that is the caller's | |
207 | * problem. Called when we down the interface or delete the address. | |
208 | */ | |
209 | static void atif_drop_device(struct net_device *dev) | |
210 | { | |
211 | struct atalk_iface **iface = &atalk_interfaces; | |
212 | struct atalk_iface *tmp; | |
213 | ||
214 | write_lock_bh(&atalk_interfaces_lock); | |
215 | while ((tmp = *iface) != NULL) { | |
216 | if (tmp->dev == dev) { | |
217 | *iface = tmp->next; | |
218 | dev_put(dev); | |
219 | kfree(tmp); | |
220 | dev->atalk_ptr = NULL; | |
221 | } else | |
222 | iface = &tmp->next; | |
223 | } | |
224 | write_unlock_bh(&atalk_interfaces_lock); | |
225 | } | |
226 | ||
227 | static struct atalk_iface *atif_add_device(struct net_device *dev, | |
228 | struct atalk_addr *sa) | |
229 | { | |
0da974f4 | 230 | struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); |
1da177e4 LT |
231 | |
232 | if (!iface) | |
233 | goto out; | |
234 | ||
1da177e4 LT |
235 | dev_hold(dev); |
236 | iface->dev = dev; | |
237 | dev->atalk_ptr = iface; | |
238 | iface->address = *sa; | |
239 | iface->status = 0; | |
240 | ||
241 | write_lock_bh(&atalk_interfaces_lock); | |
242 | iface->next = atalk_interfaces; | |
243 | atalk_interfaces = iface; | |
244 | write_unlock_bh(&atalk_interfaces_lock); | |
245 | out: | |
246 | return iface; | |
247 | } | |
248 | ||
249 | /* Perform phase 2 AARP probing on our tentative address */ | |
250 | static int atif_probe_device(struct atalk_iface *atif) | |
251 | { | |
252 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
253 | ntohs(atif->nets.nr_firstnet) + 1; | |
254 | int probe_net = ntohs(atif->address.s_net); | |
255 | int probe_node = atif->address.s_node; | |
256 | int netct, nodect; | |
257 | ||
258 | /* Offset the network we start probing with */ | |
259 | if (probe_net == ATADDR_ANYNET) { | |
260 | probe_net = ntohs(atif->nets.nr_firstnet); | |
261 | if (netrange) | |
262 | probe_net += jiffies % netrange; | |
263 | } | |
264 | if (probe_node == ATADDR_ANYNODE) | |
265 | probe_node = jiffies & 0xFF; | |
266 | ||
267 | /* Scan the networks */ | |
268 | atif->status |= ATIF_PROBE; | |
269 | for (netct = 0; netct <= netrange; netct++) { | |
270 | /* Sweep the available nodes from a given start */ | |
271 | atif->address.s_net = htons(probe_net); | |
272 | for (nodect = 0; nodect < 256; nodect++) { | |
273 | atif->address.s_node = (nodect + probe_node) & 0xFF; | |
274 | if (atif->address.s_node > 0 && | |
275 | atif->address.s_node < 254) { | |
276 | /* Probe a proposed address */ | |
277 | aarp_probe_network(atif); | |
278 | ||
279 | if (!(atif->status & ATIF_PROBE_FAIL)) { | |
280 | atif->status &= ~ATIF_PROBE; | |
281 | return 0; | |
282 | } | |
283 | } | |
284 | atif->status &= ~ATIF_PROBE_FAIL; | |
285 | } | |
286 | probe_net++; | |
287 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
288 | probe_net = ntohs(atif->nets.nr_firstnet); | |
289 | } | |
290 | atif->status &= ~ATIF_PROBE; | |
291 | ||
292 | return -EADDRINUSE; /* Network is full... */ | |
293 | } | |
294 | ||
295 | ||
296 | /* Perform AARP probing for a proxy address */ | |
297 | static int atif_proxy_probe_device(struct atalk_iface *atif, | |
298 | struct atalk_addr* proxy_addr) | |
299 | { | |
300 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
301 | ntohs(atif->nets.nr_firstnet) + 1; | |
302 | /* we probe the interface's network */ | |
303 | int probe_net = ntohs(atif->address.s_net); | |
304 | int probe_node = ATADDR_ANYNODE; /* we'll take anything */ | |
305 | int netct, nodect; | |
306 | ||
307 | /* Offset the network we start probing with */ | |
308 | if (probe_net == ATADDR_ANYNET) { | |
309 | probe_net = ntohs(atif->nets.nr_firstnet); | |
310 | if (netrange) | |
311 | probe_net += jiffies % netrange; | |
312 | } | |
313 | ||
314 | if (probe_node == ATADDR_ANYNODE) | |
315 | probe_node = jiffies & 0xFF; | |
ed4477b9 | 316 | |
1da177e4 LT |
317 | /* Scan the networks */ |
318 | for (netct = 0; netct <= netrange; netct++) { | |
319 | /* Sweep the available nodes from a given start */ | |
320 | proxy_addr->s_net = htons(probe_net); | |
321 | for (nodect = 0; nodect < 256; nodect++) { | |
322 | proxy_addr->s_node = (nodect + probe_node) & 0xFF; | |
323 | if (proxy_addr->s_node > 0 && | |
324 | proxy_addr->s_node < 254) { | |
325 | /* Tell AARP to probe a proposed address */ | |
326 | int ret = aarp_proxy_probe_network(atif, | |
327 | proxy_addr); | |
328 | ||
329 | if (ret != -EADDRINUSE) | |
330 | return ret; | |
331 | } | |
332 | } | |
333 | probe_net++; | |
334 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
335 | probe_net = ntohs(atif->nets.nr_firstnet); | |
336 | } | |
337 | ||
338 | return -EADDRINUSE; /* Network is full... */ | |
339 | } | |
340 | ||
341 | ||
342 | struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) | |
343 | { | |
344 | struct atalk_iface *iface = dev->atalk_ptr; | |
345 | return iface ? &iface->address : NULL; | |
346 | } | |
347 | ||
348 | static struct atalk_addr *atalk_find_primary(void) | |
349 | { | |
350 | struct atalk_iface *fiface = NULL; | |
351 | struct atalk_addr *retval; | |
352 | struct atalk_iface *iface; | |
353 | ||
354 | /* | |
355 | * Return a point-to-point interface only if | |
356 | * there is no non-ptp interface available. | |
357 | */ | |
358 | read_lock_bh(&atalk_interfaces_lock); | |
359 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
360 | if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) | |
361 | fiface = iface; | |
362 | if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { | |
363 | retval = &iface->address; | |
364 | goto out; | |
365 | } | |
366 | } | |
367 | ||
368 | if (fiface) | |
369 | retval = &fiface->address; | |
370 | else if (atalk_interfaces) | |
371 | retval = &atalk_interfaces->address; | |
372 | else | |
373 | retval = NULL; | |
374 | out: | |
375 | read_unlock_bh(&atalk_interfaces_lock); | |
376 | return retval; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Find a match for 'any network' - ie any of our interfaces with that | |
381 | * node number will do just nicely. | |
382 | */ | |
383 | static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) | |
384 | { | |
385 | struct atalk_iface *iface = dev->atalk_ptr; | |
386 | ||
387 | if (!iface || iface->status & ATIF_PROBE) | |
388 | goto out_err; | |
389 | ||
390 | if (node != ATADDR_BCAST && | |
391 | iface->address.s_node != node && | |
392 | node != ATADDR_ANYNODE) | |
393 | goto out_err; | |
394 | out: | |
395 | return iface; | |
396 | out_err: | |
397 | iface = NULL; | |
398 | goto out; | |
399 | } | |
400 | ||
401 | /* Find a match for a specific network:node pair */ | |
f6e276ee | 402 | static struct atalk_iface *atalk_find_interface(__be16 net, int node) |
1da177e4 LT |
403 | { |
404 | struct atalk_iface *iface; | |
405 | ||
406 | read_lock_bh(&atalk_interfaces_lock); | |
407 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
408 | if ((node == ATADDR_BCAST || | |
409 | node == ATADDR_ANYNODE || | |
410 | iface->address.s_node == node) && | |
411 | iface->address.s_net == net && | |
412 | !(iface->status & ATIF_PROBE)) | |
413 | break; | |
414 | ||
415 | /* XXXX.0 -- net.0 returns the iface associated with net */ | |
416 | if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && | |
417 | ntohs(iface->nets.nr_firstnet) <= ntohs(net) && | |
418 | ntohs(net) <= ntohs(iface->nets.nr_lastnet)) | |
ed4477b9 | 419 | break; |
1da177e4 LT |
420 | } |
421 | read_unlock_bh(&atalk_interfaces_lock); | |
422 | return iface; | |
423 | } | |
424 | ||
425 | ||
426 | /* | |
427 | * Find a route for an AppleTalk packet. This ought to get cached in | |
428 | * the socket (later on...). We know about host routes and the fact | |
429 | * that a route must be direct to broadcast. | |
430 | */ | |
431 | static struct atalk_route *atrtr_find(struct atalk_addr *target) | |
432 | { | |
433 | /* | |
ed4477b9 | 434 | * we must search through all routes unless we find a |
1da177e4 LT |
435 | * host route, because some host routes might overlap |
436 | * network routes | |
437 | */ | |
438 | struct atalk_route *net_route = NULL; | |
439 | struct atalk_route *r; | |
ed4477b9 | 440 | |
1da177e4 LT |
441 | read_lock_bh(&atalk_routes_lock); |
442 | for (r = atalk_routes; r; r = r->next) { | |
443 | if (!(r->flags & RTF_UP)) | |
444 | continue; | |
445 | ||
446 | if (r->target.s_net == target->s_net) { | |
447 | if (r->flags & RTF_HOST) { | |
448 | /* | |
449 | * if this host route is for the target, | |
450 | * the we're done | |
451 | */ | |
452 | if (r->target.s_node == target->s_node) | |
453 | goto out; | |
454 | } else | |
455 | /* | |
456 | * this route will work if there isn't a | |
457 | * direct host route, so cache it | |
458 | */ | |
459 | net_route = r; | |
460 | } | |
461 | } | |
ed4477b9 YH |
462 | |
463 | /* | |
1da177e4 LT |
464 | * if we found a network route but not a direct host |
465 | * route, then return it | |
466 | */ | |
467 | if (net_route) | |
468 | r = net_route; | |
469 | else if (atrtr_default.dev) | |
470 | r = &atrtr_default; | |
471 | else /* No route can be found */ | |
472 | r = NULL; | |
473 | out: | |
474 | read_unlock_bh(&atalk_routes_lock); | |
475 | return r; | |
476 | } | |
477 | ||
478 | ||
479 | /* | |
480 | * Given an AppleTalk network, find the device to use. This can be | |
481 | * a simple lookup. | |
482 | */ | |
483 | struct net_device *atrtr_get_dev(struct atalk_addr *sa) | |
484 | { | |
485 | struct atalk_route *atr = atrtr_find(sa); | |
486 | return atr ? atr->dev : NULL; | |
487 | } | |
488 | ||
489 | /* Set up a default router */ | |
490 | static void atrtr_set_default(struct net_device *dev) | |
491 | { | |
492 | atrtr_default.dev = dev; | |
493 | atrtr_default.flags = RTF_UP; | |
494 | atrtr_default.gateway.s_net = htons(0); | |
495 | atrtr_default.gateway.s_node = 0; | |
496 | } | |
497 | ||
498 | /* | |
499 | * Add a router. Basically make sure it looks valid and stuff the | |
500 | * entry in the list. While it uses netranges we always set them to one | |
501 | * entry to work like netatalk. | |
502 | */ | |
503 | static int atrtr_create(struct rtentry *r, struct net_device *devhint) | |
504 | { | |
505 | struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; | |
506 | struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; | |
507 | struct atalk_route *rt; | |
508 | struct atalk_iface *iface, *riface; | |
509 | int retval = -EINVAL; | |
510 | ||
511 | /* | |
512 | * Fixme: Raise/Lower a routing change semaphore for these | |
513 | * operations. | |
514 | */ | |
515 | ||
516 | /* Validate the request */ | |
517 | if (ta->sat_family != AF_APPLETALK || | |
518 | (!devhint && ga->sat_family != AF_APPLETALK)) | |
519 | goto out; | |
520 | ||
521 | /* Now walk the routing table and make our decisions */ | |
522 | write_lock_bh(&atalk_routes_lock); | |
523 | for (rt = atalk_routes; rt; rt = rt->next) { | |
524 | if (r->rt_flags != rt->flags) | |
525 | continue; | |
526 | ||
527 | if (ta->sat_addr.s_net == rt->target.s_net) { | |
528 | if (!(rt->flags & RTF_HOST)) | |
529 | break; | |
530 | if (ta->sat_addr.s_node == rt->target.s_node) | |
531 | break; | |
532 | } | |
533 | } | |
534 | ||
535 | if (!devhint) { | |
536 | riface = NULL; | |
537 | ||
538 | read_lock_bh(&atalk_interfaces_lock); | |
539 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
540 | if (!riface && | |
541 | ntohs(ga->sat_addr.s_net) >= | |
ed4477b9 | 542 | ntohs(iface->nets.nr_firstnet) && |
1da177e4 | 543 | ntohs(ga->sat_addr.s_net) <= |
ed4477b9 | 544 | ntohs(iface->nets.nr_lastnet)) |
1da177e4 LT |
545 | riface = iface; |
546 | ||
547 | if (ga->sat_addr.s_net == iface->address.s_net && | |
548 | ga->sat_addr.s_node == iface->address.s_node) | |
549 | riface = iface; | |
ed4477b9 | 550 | } |
1da177e4 LT |
551 | read_unlock_bh(&atalk_interfaces_lock); |
552 | ||
553 | retval = -ENETUNREACH; | |
554 | if (!riface) | |
555 | goto out_unlock; | |
556 | ||
557 | devhint = riface->dev; | |
558 | } | |
559 | ||
560 | if (!rt) { | |
0da974f4 | 561 | rt = kzalloc(sizeof(*rt), GFP_ATOMIC); |
1da177e4 LT |
562 | |
563 | retval = -ENOBUFS; | |
564 | if (!rt) | |
565 | goto out_unlock; | |
1da177e4 LT |
566 | |
567 | rt->next = atalk_routes; | |
568 | atalk_routes = rt; | |
569 | } | |
570 | ||
571 | /* Fill in the routing entry */ | |
572 | rt->target = ta->sat_addr; | |
c7f905f0 | 573 | dev_hold(devhint); |
1da177e4 LT |
574 | rt->dev = devhint; |
575 | rt->flags = r->rt_flags; | |
576 | rt->gateway = ga->sat_addr; | |
577 | ||
578 | retval = 0; | |
579 | out_unlock: | |
580 | write_unlock_bh(&atalk_routes_lock); | |
581 | out: | |
582 | return retval; | |
583 | } | |
584 | ||
585 | /* Delete a route. Find it and discard it */ | |
586 | static int atrtr_delete(struct atalk_addr * addr) | |
587 | { | |
588 | struct atalk_route **r = &atalk_routes; | |
589 | int retval = 0; | |
590 | struct atalk_route *tmp; | |
591 | ||
592 | write_lock_bh(&atalk_routes_lock); | |
593 | while ((tmp = *r) != NULL) { | |
594 | if (tmp->target.s_net == addr->s_net && | |
595 | (!(tmp->flags&RTF_GATEWAY) || | |
596 | tmp->target.s_node == addr->s_node)) { | |
597 | *r = tmp->next; | |
598 | dev_put(tmp->dev); | |
599 | kfree(tmp); | |
600 | goto out; | |
601 | } | |
602 | r = &tmp->next; | |
603 | } | |
604 | retval = -ENOENT; | |
605 | out: | |
606 | write_unlock_bh(&atalk_routes_lock); | |
607 | return retval; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Called when a device is downed. Just throw away any routes | |
612 | * via it. | |
613 | */ | |
614 | static void atrtr_device_down(struct net_device *dev) | |
615 | { | |
616 | struct atalk_route **r = &atalk_routes; | |
617 | struct atalk_route *tmp; | |
618 | ||
619 | write_lock_bh(&atalk_routes_lock); | |
620 | while ((tmp = *r) != NULL) { | |
621 | if (tmp->dev == dev) { | |
622 | *r = tmp->next; | |
623 | dev_put(dev); | |
624 | kfree(tmp); | |
625 | } else | |
626 | r = &tmp->next; | |
627 | } | |
628 | write_unlock_bh(&atalk_routes_lock); | |
629 | ||
630 | if (atrtr_default.dev == dev) | |
631 | atrtr_set_default(NULL); | |
632 | } | |
633 | ||
634 | /* Actually down the interface */ | |
635 | static inline void atalk_dev_down(struct net_device *dev) | |
636 | { | |
637 | atrtr_device_down(dev); /* Remove all routes for the device */ | |
638 | aarp_device_down(dev); /* Remove AARP entries for the device */ | |
639 | atif_drop_device(dev); /* Remove the device */ | |
640 | } | |
641 | ||
642 | /* | |
643 | * A device event has occurred. Watch for devices going down and | |
644 | * delete our use of them (iface and route). | |
645 | */ | |
646 | static int ddp_device_event(struct notifier_block *this, unsigned long event, | |
647 | void *ptr) | |
648 | { | |
890d52d3 EB |
649 | struct net_device *dev = ptr; |
650 | ||
721499e8 | 651 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
652 | return NOTIFY_DONE; |
653 | ||
1da177e4 LT |
654 | if (event == NETDEV_DOWN) |
655 | /* Discard any use of this */ | |
890d52d3 | 656 | atalk_dev_down(dev); |
1da177e4 LT |
657 | |
658 | return NOTIFY_DONE; | |
659 | } | |
660 | ||
661 | /* ioctl calls. Shouldn't even need touching */ | |
662 | /* Device configuration ioctl calls */ | |
663 | static int atif_ioctl(int cmd, void __user *arg) | |
664 | { | |
665 | static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; | |
666 | struct ifreq atreq; | |
667 | struct atalk_netrange *nr; | |
668 | struct sockaddr_at *sa; | |
669 | struct net_device *dev; | |
670 | struct atalk_iface *atif; | |
671 | int ct; | |
672 | int limit; | |
673 | struct rtentry rtdef; | |
674 | int add_route; | |
675 | ||
676 | if (copy_from_user(&atreq, arg, sizeof(atreq))) | |
677 | return -EFAULT; | |
678 | ||
881d966b | 679 | dev = __dev_get_by_name(&init_net, atreq.ifr_name); |
1da177e4 LT |
680 | if (!dev) |
681 | return -ENODEV; | |
682 | ||
683 | sa = (struct sockaddr_at *)&atreq.ifr_addr; | |
684 | atif = atalk_find_dev(dev); | |
685 | ||
686 | switch (cmd) { | |
4a9e4b09 JP |
687 | case SIOCSIFADDR: |
688 | if (!capable(CAP_NET_ADMIN)) | |
689 | return -EPERM; | |
690 | if (sa->sat_family != AF_APPLETALK) | |
691 | return -EINVAL; | |
692 | if (dev->type != ARPHRD_ETHER && | |
693 | dev->type != ARPHRD_LOOPBACK && | |
694 | dev->type != ARPHRD_LOCALTLK && | |
695 | dev->type != ARPHRD_PPP) | |
696 | return -EPROTONOSUPPORT; | |
697 | ||
698 | nr = (struct atalk_netrange *)&sa->sat_zero[0]; | |
699 | add_route = 1; | |
700 | ||
701 | /* | |
702 | * if this is a point-to-point iface, and we already | |
703 | * have an iface for this AppleTalk address, then we | |
704 | * should not add a route | |
705 | */ | |
706 | if ((dev->flags & IFF_POINTOPOINT) && | |
707 | atalk_find_interface(sa->sat_addr.s_net, | |
708 | sa->sat_addr.s_node)) { | |
709 | printk(KERN_DEBUG "AppleTalk: point-to-point " | |
710 | "interface added with " | |
711 | "existing address\n"); | |
712 | add_route = 0; | |
713 | } | |
1da177e4 | 714 | |
4a9e4b09 JP |
715 | /* |
716 | * Phase 1 is fine on LocalTalk but we don't do | |
717 | * EtherTalk phase 1. Anyone wanting to add it go ahead. | |
718 | */ | |
719 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
720 | return -EPROTONOSUPPORT; | |
721 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
722 | sa->sat_addr.s_node == 254) | |
723 | return -EINVAL; | |
724 | if (atif) { | |
725 | /* Already setting address */ | |
726 | if (atif->status & ATIF_PROBE) | |
727 | return -EBUSY; | |
728 | ||
729 | atif->address.s_net = sa->sat_addr.s_net; | |
730 | atif->address.s_node = sa->sat_addr.s_node; | |
731 | atrtr_device_down(dev); /* Flush old routes */ | |
732 | } else { | |
733 | atif = atif_add_device(dev, &sa->sat_addr); | |
1da177e4 | 734 | if (!atif) |
4a9e4b09 JP |
735 | return -ENOMEM; |
736 | } | |
737 | atif->nets = *nr; | |
738 | ||
739 | /* | |
740 | * Check if the chosen address is used. If so we | |
741 | * error and atalkd will try another. | |
742 | */ | |
743 | ||
744 | if (!(dev->flags & IFF_LOOPBACK) && | |
745 | !(dev->flags & IFF_POINTOPOINT) && | |
746 | atif_probe_device(atif) < 0) { | |
747 | atif_drop_device(dev); | |
748 | return -EADDRINUSE; | |
749 | } | |
1da177e4 | 750 | |
4a9e4b09 JP |
751 | /* Hey it worked - add the direct routes */ |
752 | sa = (struct sockaddr_at *)&rtdef.rt_gateway; | |
753 | sa->sat_family = AF_APPLETALK; | |
754 | sa->sat_addr.s_net = atif->address.s_net; | |
755 | sa->sat_addr.s_node = atif->address.s_node; | |
756 | sa = (struct sockaddr_at *)&rtdef.rt_dst; | |
757 | rtdef.rt_flags = RTF_UP; | |
758 | sa->sat_family = AF_APPLETALK; | |
759 | sa->sat_addr.s_node = ATADDR_ANYNODE; | |
760 | if (dev->flags & IFF_LOOPBACK || | |
761 | dev->flags & IFF_POINTOPOINT) | |
762 | rtdef.rt_flags |= RTF_HOST; | |
763 | ||
764 | /* Routerless initial state */ | |
765 | if (nr->nr_firstnet == htons(0) && | |
766 | nr->nr_lastnet == htons(0xFFFE)) { | |
1da177e4 | 767 | sa->sat_addr.s_net = atif->address.s_net; |
4a9e4b09 JP |
768 | atrtr_create(&rtdef, dev); |
769 | atrtr_set_default(dev); | |
770 | } else { | |
771 | limit = ntohs(nr->nr_lastnet); | |
772 | if (limit - ntohs(nr->nr_firstnet) > 4096) { | |
773 | printk(KERN_WARNING "Too many routes/" | |
774 | "iface.\n"); | |
1da177e4 | 775 | return -EINVAL; |
4a9e4b09 JP |
776 | } |
777 | if (add_route) | |
778 | for (ct = ntohs(nr->nr_firstnet); | |
779 | ct <= limit; ct++) { | |
780 | sa->sat_addr.s_net = htons(ct); | |
781 | atrtr_create(&rtdef, dev); | |
782 | } | |
783 | } | |
784 | dev_mc_add_global(dev, aarp_mcast); | |
785 | return 0; | |
786 | ||
787 | case SIOCGIFADDR: | |
788 | if (!atif) | |
789 | return -EADDRNOTAVAIL; | |
790 | ||
791 | sa->sat_family = AF_APPLETALK; | |
792 | sa->sat_addr = atif->address; | |
793 | break; | |
794 | ||
795 | case SIOCGIFBRDADDR: | |
796 | if (!atif) | |
797 | return -EADDRNOTAVAIL; | |
798 | ||
799 | sa->sat_family = AF_APPLETALK; | |
800 | sa->sat_addr.s_net = atif->address.s_net; | |
801 | sa->sat_addr.s_node = ATADDR_BCAST; | |
802 | break; | |
803 | ||
804 | case SIOCATALKDIFADDR: | |
805 | case SIOCDIFADDR: | |
806 | if (!capable(CAP_NET_ADMIN)) | |
807 | return -EPERM; | |
808 | if (sa->sat_family != AF_APPLETALK) | |
809 | return -EINVAL; | |
810 | atalk_dev_down(dev); | |
811 | break; | |
812 | ||
813 | case SIOCSARP: | |
814 | if (!capable(CAP_NET_ADMIN)) | |
815 | return -EPERM; | |
816 | if (sa->sat_family != AF_APPLETALK) | |
817 | return -EINVAL; | |
818 | /* | |
819 | * for now, we only support proxy AARP on ELAP; | |
820 | * we should be able to do it for LocalTalk, too. | |
821 | */ | |
822 | if (dev->type != ARPHRD_ETHER) | |
823 | return -EPROTONOSUPPORT; | |
824 | ||
825 | /* | |
826 | * atif points to the current interface on this network; | |
827 | * we aren't concerned about its current status (at | |
828 | * least for now), but it has all the settings about | |
829 | * the network we're going to probe. Consequently, it | |
830 | * must exist. | |
831 | */ | |
832 | if (!atif) | |
833 | return -EADDRNOTAVAIL; | |
834 | ||
835 | nr = (struct atalk_netrange *)&(atif->nets); | |
836 | /* | |
837 | * Phase 1 is fine on Localtalk but we don't do | |
838 | * Ethertalk phase 1. Anyone wanting to add it go ahead. | |
839 | */ | |
840 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
841 | return -EPROTONOSUPPORT; | |
842 | ||
843 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
844 | sa->sat_addr.s_node == 254) | |
845 | return -EINVAL; | |
846 | ||
847 | /* | |
848 | * Check if the chosen address is used. If so we | |
849 | * error and ATCP will try another. | |
850 | */ | |
851 | if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) | |
852 | return -EADDRINUSE; | |
853 | ||
854 | /* | |
855 | * We now have an address on the local network, and | |
856 | * the AARP code will defend it for us until we take it | |
857 | * down. We don't set up any routes right now, because | |
858 | * ATCP will install them manually via SIOCADDRT. | |
859 | */ | |
860 | break; | |
861 | ||
862 | case SIOCDARP: | |
863 | if (!capable(CAP_NET_ADMIN)) | |
864 | return -EPERM; | |
865 | if (sa->sat_family != AF_APPLETALK) | |
866 | return -EINVAL; | |
867 | if (!atif) | |
868 | return -EADDRNOTAVAIL; | |
869 | ||
870 | /* give to aarp module to remove proxy entry */ | |
871 | aarp_proxy_remove(atif->dev, &(sa->sat_addr)); | |
872 | return 0; | |
1da177e4 LT |
873 | } |
874 | ||
875 | return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; | |
876 | } | |
877 | ||
878 | /* Routing ioctl() calls */ | |
879 | static int atrtr_ioctl(unsigned int cmd, void __user *arg) | |
880 | { | |
881 | struct rtentry rt; | |
882 | ||
883 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
884 | return -EFAULT; | |
885 | ||
886 | switch (cmd) { | |
4a9e4b09 JP |
887 | case SIOCDELRT: |
888 | if (rt.rt_dst.sa_family != AF_APPLETALK) | |
889 | return -EINVAL; | |
890 | return atrtr_delete(&((struct sockaddr_at *) | |
891 | &rt.rt_dst)->sat_addr); | |
892 | ||
893 | case SIOCADDRT: { | |
894 | struct net_device *dev = NULL; | |
895 | if (rt.rt_dev) { | |
896 | char name[IFNAMSIZ]; | |
897 | if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1)) | |
898 | return -EFAULT; | |
899 | name[IFNAMSIZ-1] = '\0'; | |
900 | dev = __dev_get_by_name(&init_net, name); | |
901 | if (!dev) | |
902 | return -ENODEV; | |
1da177e4 | 903 | } |
4a9e4b09 JP |
904 | return atrtr_create(&rt, dev); |
905 | } | |
1da177e4 LT |
906 | } |
907 | return -EINVAL; | |
908 | } | |
909 | ||
910 | /**************************************************************************\ | |
911 | * * | |
912 | * Handling for system calls applied via the various interfaces to an * | |
913 | * AppleTalk socket object. * | |
914 | * * | |
915 | \**************************************************************************/ | |
916 | ||
917 | /* | |
918 | * Checksum: This is 'optional'. It's quite likely also a good | |
919 | * candidate for assembler hackery 8) | |
920 | */ | |
ed4477b9 | 921 | static unsigned long atalk_sum_partial(const unsigned char *data, |
1da177e4 LT |
922 | int len, unsigned long sum) |
923 | { | |
924 | /* This ought to be unwrapped neatly. I'll trust gcc for now */ | |
925 | while (len--) { | |
f7a3a1d8 JP |
926 | sum += *data++; |
927 | sum = rol16(sum, 1); | |
1da177e4 LT |
928 | } |
929 | return sum; | |
930 | } | |
931 | ||
932 | /* Checksum skb data -- similar to skb_checksum */ | |
933 | static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, | |
934 | int len, unsigned long sum) | |
935 | { | |
1a028e50 | 936 | int start = skb_headlen(skb); |
c32ba3f9 | 937 | struct sk_buff *frag_iter; |
1da177e4 LT |
938 | int i, copy; |
939 | ||
940 | /* checksum stuff in header space */ | |
1a028e50 | 941 | if ( (copy = start - offset) > 0) { |
1da177e4 LT |
942 | if (copy > len) |
943 | copy = len; | |
944 | sum = atalk_sum_partial(skb->data + offset, copy, sum); | |
ed4477b9 | 945 | if ( (len -= copy) == 0) |
1da177e4 LT |
946 | return sum; |
947 | ||
948 | offset += copy; | |
949 | } | |
950 | ||
951 | /* checksum stuff in frags */ | |
952 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1a028e50 | 953 | int end; |
9e903e08 | 954 | const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
547b792c | 955 | WARN_ON(start > offset + len); |
1a028e50 | 956 | |
9e903e08 | 957 | end = start + skb_frag_size(frag); |
1da177e4 LT |
958 | if ((copy = end - offset) > 0) { |
959 | u8 *vaddr; | |
1da177e4 LT |
960 | |
961 | if (copy > len) | |
962 | copy = len; | |
51c56b00 | 963 | vaddr = kmap_atomic(skb_frag_page(frag)); |
1a028e50 DM |
964 | sum = atalk_sum_partial(vaddr + frag->page_offset + |
965 | offset - start, copy, sum); | |
51c56b00 | 966 | kunmap_atomic(vaddr); |
1da177e4 LT |
967 | |
968 | if (!(len -= copy)) | |
969 | return sum; | |
970 | offset += copy; | |
971 | } | |
1a028e50 | 972 | start = end; |
1da177e4 LT |
973 | } |
974 | ||
c32ba3f9 DM |
975 | skb_walk_frags(skb, frag_iter) { |
976 | int end; | |
1a028e50 | 977 | |
c32ba3f9 | 978 | WARN_ON(start > offset + len); |
1da177e4 | 979 | |
c32ba3f9 DM |
980 | end = start + frag_iter->len; |
981 | if ((copy = end - offset) > 0) { | |
982 | if (copy > len) | |
983 | copy = len; | |
984 | sum = atalk_sum_skb(frag_iter, offset - start, | |
985 | copy, sum); | |
986 | if ((len -= copy) == 0) | |
987 | return sum; | |
988 | offset += copy; | |
1da177e4 | 989 | } |
c32ba3f9 | 990 | start = end; |
1da177e4 LT |
991 | } |
992 | ||
993 | BUG_ON(len > 0); | |
994 | ||
995 | return sum; | |
996 | } | |
997 | ||
2a50f28c | 998 | static __be16 atalk_checksum(const struct sk_buff *skb, int len) |
1da177e4 LT |
999 | { |
1000 | unsigned long sum; | |
1001 | ||
1002 | /* skip header 4 bytes */ | |
1003 | sum = atalk_sum_skb(skb, 4, len-4, 0); | |
1004 | ||
1005 | /* Use 0xFFFF for 0. 0 itself means none */ | |
2a50f28c | 1006 | return sum ? htons((unsigned short)sum) : htons(0xFFFF); |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | static struct proto ddp_proto = { | |
1010 | .name = "DDP", | |
1011 | .owner = THIS_MODULE, | |
1012 | .obj_size = sizeof(struct atalk_sock), | |
1013 | }; | |
1014 | ||
1015 | /* | |
1016 | * Create a socket. Initialise the socket, blank the addresses | |
1017 | * set the state. | |
1018 | */ | |
3f378b68 EP |
1019 | static int atalk_create(struct net *net, struct socket *sock, int protocol, |
1020 | int kern) | |
1da177e4 LT |
1021 | { |
1022 | struct sock *sk; | |
1023 | int rc = -ESOCKTNOSUPPORT; | |
1024 | ||
09ad9bc7 | 1025 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
1026 | return -EAFNOSUPPORT; |
1027 | ||
1da177e4 LT |
1028 | /* |
1029 | * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do | |
ed4477b9 | 1030 | * and gives you the full ELAP frame. Should be handy for CAP 8) |
1da177e4 LT |
1031 | */ |
1032 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) | |
1033 | goto out; | |
1034 | rc = -ENOMEM; | |
6257ff21 | 1035 | sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto); |
1da177e4 LT |
1036 | if (!sk) |
1037 | goto out; | |
1038 | rc = 0; | |
1039 | sock->ops = &atalk_dgram_ops; | |
1040 | sock_init_data(sock, sk); | |
1041 | ||
1042 | /* Checksums on by default */ | |
1043 | sock_set_flag(sk, SOCK_ZAPPED); | |
1044 | out: | |
1045 | return rc; | |
1046 | } | |
1047 | ||
1048 | /* Free a socket. No work needed */ | |
1049 | static int atalk_release(struct socket *sock) | |
1050 | { | |
1051 | struct sock *sk = sock->sk; | |
1052 | ||
1053 | if (sk) { | |
c100c8f4 DM |
1054 | sock_hold(sk); |
1055 | lock_sock(sk); | |
1056 | ||
1da177e4 LT |
1057 | sock_orphan(sk); |
1058 | sock->sk = NULL; | |
1059 | atalk_destroy_socket(sk); | |
b20e7bbf | 1060 | |
c100c8f4 DM |
1061 | release_sock(sk); |
1062 | sock_put(sk); | |
1063 | } | |
1da177e4 LT |
1064 | return 0; |
1065 | } | |
1066 | ||
1067 | /** | |
1068 | * atalk_pick_and_bind_port - Pick a source port when one is not given | |
1069 | * @sk - socket to insert into the tables | |
1070 | * @sat - address to search for | |
1071 | * | |
1072 | * Pick a source port when one is not given. If we can find a suitable free | |
1073 | * one, we insert the socket into the tables using it. | |
1074 | * | |
1075 | * This whole operation must be atomic. | |
1076 | */ | |
1077 | static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat) | |
1078 | { | |
1079 | int retval; | |
1080 | ||
1081 | write_lock_bh(&atalk_sockets_lock); | |
1082 | ||
1083 | for (sat->sat_port = ATPORT_RESERVED; | |
1084 | sat->sat_port < ATPORT_LAST; | |
1085 | sat->sat_port++) { | |
1086 | struct sock *s; | |
1087 | struct hlist_node *node; | |
1088 | ||
1089 | sk_for_each(s, node, &atalk_sockets) { | |
1090 | struct atalk_sock *at = at_sk(s); | |
1091 | ||
1092 | if (at->src_net == sat->sat_addr.s_net && | |
1093 | at->src_node == sat->sat_addr.s_node && | |
1094 | at->src_port == sat->sat_port) | |
1095 | goto try_next_port; | |
1096 | } | |
1097 | ||
1098 | /* Wheee, it's free, assign and insert. */ | |
1099 | __atalk_insert_socket(sk); | |
1100 | at_sk(sk)->src_port = sat->sat_port; | |
1101 | retval = 0; | |
1102 | goto out; | |
1103 | ||
1104 | try_next_port:; | |
1105 | } | |
1106 | ||
1107 | retval = -EBUSY; | |
1108 | out: | |
1109 | write_unlock_bh(&atalk_sockets_lock); | |
1110 | return retval; | |
1111 | } | |
1112 | ||
1113 | static int atalk_autobind(struct sock *sk) | |
1114 | { | |
1115 | struct atalk_sock *at = at_sk(sk); | |
1116 | struct sockaddr_at sat; | |
1117 | struct atalk_addr *ap = atalk_find_primary(); | |
1118 | int n = -EADDRNOTAVAIL; | |
1119 | ||
1120 | if (!ap || ap->s_net == htons(ATADDR_ANYNET)) | |
1121 | goto out; | |
1122 | ||
1123 | at->src_net = sat.sat_addr.s_net = ap->s_net; | |
1124 | at->src_node = sat.sat_addr.s_node = ap->s_node; | |
1125 | ||
1126 | n = atalk_pick_and_bind_port(sk, &sat); | |
1127 | if (!n) | |
1128 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1129 | out: | |
1130 | return n; | |
1131 | } | |
1132 | ||
1133 | /* Set the address 'our end' of the connection */ | |
1134 | static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1135 | { | |
1136 | struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; | |
1137 | struct sock *sk = sock->sk; | |
1138 | struct atalk_sock *at = at_sk(sk); | |
ecced8ba | 1139 | int err; |
1da177e4 LT |
1140 | |
1141 | if (!sock_flag(sk, SOCK_ZAPPED) || | |
1142 | addr_len != sizeof(struct sockaddr_at)) | |
1143 | return -EINVAL; | |
1144 | ||
1145 | if (addr->sat_family != AF_APPLETALK) | |
1146 | return -EAFNOSUPPORT; | |
1147 | ||
60d9f461 | 1148 | lock_sock(sk); |
1da177e4 LT |
1149 | if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { |
1150 | struct atalk_addr *ap = atalk_find_primary(); | |
1151 | ||
ecced8ba | 1152 | err = -EADDRNOTAVAIL; |
1da177e4 | 1153 | if (!ap) |
ecced8ba | 1154 | goto out; |
1da177e4 LT |
1155 | |
1156 | at->src_net = addr->sat_addr.s_net = ap->s_net; | |
1157 | at->src_node = addr->sat_addr.s_node= ap->s_node; | |
1158 | } else { | |
ecced8ba | 1159 | err = -EADDRNOTAVAIL; |
1da177e4 LT |
1160 | if (!atalk_find_interface(addr->sat_addr.s_net, |
1161 | addr->sat_addr.s_node)) | |
ecced8ba | 1162 | goto out; |
1da177e4 LT |
1163 | |
1164 | at->src_net = addr->sat_addr.s_net; | |
1165 | at->src_node = addr->sat_addr.s_node; | |
1166 | } | |
1167 | ||
1168 | if (addr->sat_port == ATADDR_ANYPORT) { | |
ecced8ba | 1169 | err = atalk_pick_and_bind_port(sk, addr); |
1da177e4 | 1170 | |
ecced8ba AB |
1171 | if (err < 0) |
1172 | goto out; | |
1da177e4 LT |
1173 | } else { |
1174 | at->src_port = addr->sat_port; | |
1175 | ||
ecced8ba | 1176 | err = -EADDRINUSE; |
1da177e4 | 1177 | if (atalk_find_or_insert_socket(sk, addr)) |
ecced8ba | 1178 | goto out; |
1da177e4 LT |
1179 | } |
1180 | ||
1181 | sock_reset_flag(sk, SOCK_ZAPPED); | |
ecced8ba AB |
1182 | err = 0; |
1183 | out: | |
60d9f461 | 1184 | release_sock(sk); |
ecced8ba | 1185 | return err; |
1da177e4 LT |
1186 | } |
1187 | ||
1188 | /* Set the address we talk to */ | |
1189 | static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, | |
1190 | int addr_len, int flags) | |
1191 | { | |
1192 | struct sock *sk = sock->sk; | |
1193 | struct atalk_sock *at = at_sk(sk); | |
1194 | struct sockaddr_at *addr; | |
ecced8ba | 1195 | int err; |
1da177e4 LT |
1196 | |
1197 | sk->sk_state = TCP_CLOSE; | |
1198 | sock->state = SS_UNCONNECTED; | |
1199 | ||
1200 | if (addr_len != sizeof(*addr)) | |
1201 | return -EINVAL; | |
1202 | ||
1203 | addr = (struct sockaddr_at *)uaddr; | |
1204 | ||
1205 | if (addr->sat_family != AF_APPLETALK) | |
1206 | return -EAFNOSUPPORT; | |
1207 | ||
1208 | if (addr->sat_addr.s_node == ATADDR_BCAST && | |
1209 | !sock_flag(sk, SOCK_BROADCAST)) { | |
ed4477b9 | 1210 | #if 1 |
278f015e | 1211 | pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n", |
1da177e4 LT |
1212 | current->comm); |
1213 | #else | |
1214 | return -EACCES; | |
ed4477b9 | 1215 | #endif |
1da177e4 LT |
1216 | } |
1217 | ||
60d9f461 | 1218 | lock_sock(sk); |
ecced8ba | 1219 | err = -EBUSY; |
1da177e4 LT |
1220 | if (sock_flag(sk, SOCK_ZAPPED)) |
1221 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1222 | goto out; |
1da177e4 | 1223 | |
ecced8ba | 1224 | err = -ENETUNREACH; |
1da177e4 | 1225 | if (!atrtr_get_dev(&addr->sat_addr)) |
ecced8ba | 1226 | goto out; |
1da177e4 LT |
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; | |
ecced8ba AB |
1234 | err = 0; |
1235 | out: | |
60d9f461 | 1236 | release_sock(sk); |
ecced8ba | 1237 | return err; |
1da177e4 LT |
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); | |
ecced8ba | 1250 | int err; |
1da177e4 | 1251 | |
60d9f461 | 1252 | lock_sock(sk); |
ecced8ba | 1253 | err = -ENOBUFS; |
1da177e4 LT |
1254 | if (sock_flag(sk, SOCK_ZAPPED)) |
1255 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1256 | goto out; |
1da177e4 LT |
1257 | |
1258 | *uaddr_len = sizeof(struct sockaddr_at); | |
3d392475 | 1259 | memset(&sat.sat_zero, 0, sizeof(sat.sat_zero)); |
1da177e4 LT |
1260 | |
1261 | if (peer) { | |
ecced8ba | 1262 | err = -ENOTCONN; |
1da177e4 | 1263 | if (sk->sk_state != TCP_ESTABLISHED) |
ecced8ba | 1264 | goto out; |
1da177e4 LT |
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 | ||
ecced8ba | 1275 | err = 0; |
1da177e4 LT |
1276 | sat.sat_family = AF_APPLETALK; |
1277 | memcpy(uaddr, &sat, sizeof(sat)); | |
ecced8ba AB |
1278 | |
1279 | out: | |
60d9f461 | 1280 | release_sock(sk); |
ecced8ba | 1281 | return err; |
1da177e4 LT |
1282 | } |
1283 | ||
1284 | #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE) | |
1285 | static __inline__ int is_ip_over_ddp(struct sk_buff *skb) | |
1286 | { | |
ed4477b9 | 1287 | return skb->data[12] == 22; |
1da177e4 LT |
1288 | } |
1289 | ||
1290 | static int handle_ip_over_ddp(struct sk_buff *skb) | |
1291 | { | |
881d966b | 1292 | struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0"); |
1da177e4 LT |
1293 | struct net_device_stats *stats; |
1294 | ||
1295 | /* This needs to be able to handle ipddp"N" devices */ | |
ffcfb8db ACM |
1296 | if (!dev) { |
1297 | kfree_skb(skb); | |
1298 | return NET_RX_DROP; | |
1299 | } | |
1da177e4 | 1300 | |
ed4477b9 YH |
1301 | skb->protocol = htons(ETH_P_IP); |
1302 | skb_pull(skb, 13); | |
1303 | skb->dev = dev; | |
badff6d0 | 1304 | skb_reset_transport_header(skb); |
1da177e4 | 1305 | |
524ad0a7 | 1306 | stats = netdev_priv(dev); |
ed4477b9 YH |
1307 | stats->rx_packets++; |
1308 | stats->rx_bytes += skb->len + 13; | |
ffcfb8db | 1309 | return netif_rx(skb); /* Send the SKB up to a higher place. */ |
1da177e4 LT |
1310 | } |
1311 | #else | |
1312 | /* make it easy for gcc to optimize this test out, i.e. kill the code */ | |
1313 | #define is_ip_over_ddp(skb) 0 | |
1314 | #define handle_ip_over_ddp(skb) 0 | |
1315 | #endif | |
1316 | ||
ffcfb8db ACM |
1317 | static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev, |
1318 | struct ddpehdr *ddp, __u16 len_hops, int origlen) | |
1da177e4 LT |
1319 | { |
1320 | struct atalk_route *rt; | |
1321 | struct atalk_addr ta; | |
1322 | ||
1323 | /* | |
1324 | * Don't route multicast, etc., packets, or packets sent to "this | |
ed4477b9 | 1325 | * network" |
1da177e4 LT |
1326 | */ |
1327 | if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { | |
1328 | /* | |
1329 | * FIXME: | |
1330 | * | |
1331 | * Can it ever happen that a packet is from a PPP iface and | |
1332 | * needs to be broadcast onto the default network? | |
1333 | */ | |
1334 | if (dev->type == ARPHRD_PPP) | |
1335 | printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " | |
1336 | "packet received from PPP iface\n"); | |
1337 | goto free_it; | |
1338 | } | |
1339 | ||
1340 | ta.s_net = ddp->deh_dnet; | |
1341 | ta.s_node = ddp->deh_dnode; | |
1342 | ||
1343 | /* Route the packet */ | |
1344 | rt = atrtr_find(&ta); | |
2a50f28c AV |
1345 | /* increment hops count */ |
1346 | len_hops += 1 << 10; | |
1347 | if (!rt || !(len_hops & (15 << 10))) | |
1da177e4 | 1348 | goto free_it; |
2a50f28c | 1349 | |
1da177e4 | 1350 | /* FIXME: use skb->cb to be able to use shared skbs */ |
1da177e4 LT |
1351 | |
1352 | /* | |
1353 | * Route goes through another gateway, so set the target to the | |
1354 | * gateway instead. | |
1355 | */ | |
1356 | ||
1357 | if (rt->flags & RTF_GATEWAY) { | |
1358 | ta.s_net = rt->gateway.s_net; | |
1359 | ta.s_node = rt->gateway.s_node; | |
1360 | } | |
1361 | ||
ed4477b9 YH |
1362 | /* Fix up skb->len field */ |
1363 | skb_trim(skb, min_t(unsigned int, origlen, | |
1da177e4 | 1364 | (rt->dev->hard_header_len + |
2a50f28c | 1365 | ddp_dl->header_length + (len_hops & 1023)))); |
1da177e4 | 1366 | |
1da177e4 | 1367 | /* FIXME: use skb->cb to be able to use shared skbs */ |
2a50f28c | 1368 | ddp->deh_len_hops = htons(len_hops); |
1da177e4 LT |
1369 | |
1370 | /* | |
1371 | * Send the buffer onwards | |
1372 | * | |
1373 | * Now we must always be careful. If it's come from LocalTalk to | |
1374 | * EtherTalk it might not fit | |
1375 | * | |
1376 | * Order matters here: If a packet has to be copied to make a new | |
1377 | * headroom (rare hopefully) then it won't need unsharing. | |
1378 | * | |
1379 | * Note. ddp-> becomes invalid at the realloc. | |
1380 | */ | |
1381 | if (skb_headroom(skb) < 22) { | |
1382 | /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ | |
1383 | struct sk_buff *nskb = skb_realloc_headroom(skb, 32); | |
1384 | kfree_skb(skb); | |
1da177e4 LT |
1385 | skb = nskb; |
1386 | } else | |
1387 | skb = skb_unshare(skb, GFP_ATOMIC); | |
ed4477b9 | 1388 | |
1da177e4 LT |
1389 | /* |
1390 | * If the buffer didn't vanish into the lack of space bitbucket we can | |
1391 | * send it. | |
1392 | */ | |
ffcfb8db ACM |
1393 | if (skb == NULL) |
1394 | goto drop; | |
1395 | ||
1396 | if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP) | |
1397 | return NET_RX_DROP; | |
8be8057e | 1398 | return NET_RX_SUCCESS; |
1da177e4 LT |
1399 | free_it: |
1400 | kfree_skb(skb); | |
ffcfb8db ACM |
1401 | drop: |
1402 | return NET_RX_DROP; | |
1da177e4 LT |
1403 | } |
1404 | ||
1405 | /** | |
1406 | * atalk_rcv - Receive a packet (in skb) from device dev | |
1407 | * @skb - packet received | |
1408 | * @dev - network device where the packet comes from | |
1409 | * @pt - packet type | |
1410 | * | |
1411 | * Receive a packet (in skb) from device dev. This has come from the SNAP | |
b0e380b1 ACM |
1412 | * decoder, and on entry skb->transport_header is the DDP header, skb->len |
1413 | * is the DDP header, skb->len is the DDP length. The physical headers | |
1414 | * have been extracted. PPP should probably pass frames marked as for this | |
1415 | * layer. [ie ARPHRD_ETHERTALK] | |
1da177e4 LT |
1416 | */ |
1417 | static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1418 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
1419 | { |
1420 | struct ddpehdr *ddp; | |
1421 | struct sock *sock; | |
1422 | struct atalk_iface *atif; | |
1423 | struct sockaddr_at tosat; | |
ed4477b9 | 1424 | int origlen; |
2a50f28c | 1425 | __u16 len_hops; |
1da177e4 | 1426 | |
721499e8 | 1427 | if (!net_eq(dev_net(dev), &init_net)) |
6885ffb3 | 1428 | goto drop; |
e730c155 | 1429 | |
1da177e4 | 1430 | /* Don't mangle buffer if shared */ |
ed4477b9 | 1431 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 | 1432 | goto out; |
ed4477b9 | 1433 | |
1da177e4 LT |
1434 | /* Size check and make sure header is contiguous */ |
1435 | if (!pskb_may_pull(skb, sizeof(*ddp))) | |
6885ffb3 | 1436 | goto drop; |
1da177e4 LT |
1437 | |
1438 | ddp = ddp_hdr(skb); | |
1439 | ||
2a50f28c | 1440 | len_hops = ntohs(ddp->deh_len_hops); |
1da177e4 LT |
1441 | |
1442 | /* Trim buffer in case of stray trailing data */ | |
1443 | origlen = skb->len; | |
2a50f28c | 1444 | skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); |
1da177e4 LT |
1445 | |
1446 | /* | |
1447 | * Size check to see if ddp->deh_len was crap | |
1448 | * (Otherwise we'll detonate most spectacularly | |
75559c16 | 1449 | * in the middle of atalk_checksum() or recvmsg()). |
1da177e4 | 1450 | */ |
75559c16 JD |
1451 | if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { |
1452 | pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " | |
1453 | "skb->len=%u)\n", len_hops & 1023, skb->len); | |
6885ffb3 | 1454 | goto drop; |
75559c16 | 1455 | } |
1da177e4 LT |
1456 | |
1457 | /* | |
1458 | * Any checksums. Note we don't do htons() on this == is assumed to be | |
1459 | * valid for net byte orders all over the networking code... | |
1460 | */ | |
1461 | if (ddp->deh_sum && | |
2a50f28c | 1462 | atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum) |
1da177e4 | 1463 | /* Not a valid AppleTalk frame - dustbin time */ |
6885ffb3 | 1464 | goto drop; |
1da177e4 LT |
1465 | |
1466 | /* Check the packet is aimed at us */ | |
1467 | if (!ddp->deh_dnet) /* Net 0 is 'this network' */ | |
1468 | atif = atalk_find_anynet(ddp->deh_dnode, dev); | |
1469 | else | |
1470 | atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); | |
1471 | ||
1da177e4 | 1472 | if (!atif) { |
64233bff OD |
1473 | /* Not ours, so we route the packet via the correct |
1474 | * AppleTalk iface | |
1475 | */ | |
ffcfb8db | 1476 | return atalk_route_packet(skb, dev, ddp, len_hops, origlen); |
1da177e4 LT |
1477 | } |
1478 | ||
1479 | /* if IP over DDP is not selected this code will be optimized out */ | |
1480 | if (is_ip_over_ddp(skb)) | |
1481 | return handle_ip_over_ddp(skb); | |
1482 | /* | |
1483 | * Which socket - atalk_search_socket() looks for a *full match* | |
1484 | * of the <net, node, port> tuple. | |
1485 | */ | |
1486 | tosat.sat_addr.s_net = ddp->deh_dnet; | |
1487 | tosat.sat_addr.s_node = ddp->deh_dnode; | |
1488 | tosat.sat_port = ddp->deh_dport; | |
1489 | ||
1490 | sock = atalk_search_socket(&tosat, atif); | |
1491 | if (!sock) /* But not one of our sockets */ | |
6885ffb3 | 1492 | goto drop; |
1da177e4 LT |
1493 | |
1494 | /* Queue packet (standard) */ | |
1495 | skb->sk = sock; | |
1496 | ||
1497 | if (sock_queue_rcv_skb(sock, skb) < 0) | |
6885ffb3 MS |
1498 | goto drop; |
1499 | ||
1500 | return NET_RX_SUCCESS; | |
1501 | ||
1502 | drop: | |
1da177e4 | 1503 | kfree_skb(skb); |
6885ffb3 MS |
1504 | out: |
1505 | return NET_RX_DROP; | |
1506 | ||
1da177e4 LT |
1507 | } |
1508 | ||
1509 | /* | |
1510 | * Receive a LocalTalk frame. We make some demands on the caller here. | |
1511 | * Caller must provide enough headroom on the packet to pull the short | |
1512 | * header and append a long one. | |
1513 | */ | |
1514 | static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1515 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 | 1516 | { |
721499e8 | 1517 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
1518 | goto freeit; |
1519 | ||
1da177e4 | 1520 | /* Expand any short form frames */ |
98e399f8 | 1521 | if (skb_mac_header(skb)[2] == 1) { |
1da177e4 LT |
1522 | struct ddpehdr *ddp; |
1523 | /* Find our address */ | |
1524 | struct atalk_addr *ap = atalk_find_dev_addr(dev); | |
1525 | ||
2a50f28c | 1526 | if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) |
1da177e4 LT |
1527 | goto freeit; |
1528 | ||
1529 | /* Don't mangle buffer if shared */ | |
ed4477b9 | 1530 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 LT |
1531 | return 0; |
1532 | ||
1533 | /* | |
1534 | * The push leaves us with a ddephdr not an shdr, and | |
1535 | * handily the port bytes in the right place preset. | |
1536 | */ | |
1537 | ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4); | |
1538 | ||
1539 | /* Now fill in the long header */ | |
1540 | ||
ed4477b9 YH |
1541 | /* |
1542 | * These two first. The mac overlays the new source/dest | |
1543 | * network information so we MUST copy these before | |
1544 | * we write the network numbers ! | |
1545 | */ | |
1da177e4 | 1546 | |
98e399f8 ACM |
1547 | ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */ |
1548 | ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */ | |
1da177e4 LT |
1549 | |
1550 | ddp->deh_dnet = ap->s_net; /* Network number */ | |
1551 | ddp->deh_snet = ap->s_net; | |
1552 | ddp->deh_sum = 0; /* No checksum */ | |
1553 | /* | |
1554 | * Not sure about this bit... | |
1555 | */ | |
2a50f28c AV |
1556 | /* Non routable, so force a drop if we slip up later */ |
1557 | ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); | |
1da177e4 | 1558 | } |
badff6d0 | 1559 | skb_reset_transport_header(skb); |
1da177e4 | 1560 | |
f2ccd8fa | 1561 | return atalk_rcv(skb, dev, pt, orig_dev); |
1da177e4 LT |
1562 | freeit: |
1563 | kfree_skb(skb); | |
1564 | return 0; | |
1565 | } | |
1566 | ||
1567 | static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | |
1568 | size_t len) | |
1569 | { | |
1570 | struct sock *sk = sock->sk; | |
1571 | struct atalk_sock *at = at_sk(sk); | |
1572 | struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name; | |
1573 | int flags = msg->msg_flags; | |
1574 | int loopback = 0; | |
1575 | struct sockaddr_at local_satalk, gsat; | |
1576 | struct sk_buff *skb; | |
1577 | struct net_device *dev; | |
1578 | struct ddpehdr *ddp; | |
1579 | int size; | |
1580 | struct atalk_route *rt; | |
1581 | int err; | |
1582 | ||
1583 | if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) | |
1584 | return -EINVAL; | |
1585 | ||
1586 | if (len > DDP_MAXSZ) | |
1587 | return -EMSGSIZE; | |
1588 | ||
60d9f461 | 1589 | lock_sock(sk); |
1da177e4 | 1590 | if (usat) { |
ecced8ba | 1591 | err = -EBUSY; |
1da177e4 LT |
1592 | if (sock_flag(sk, SOCK_ZAPPED)) |
1593 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1594 | goto out; |
1da177e4 | 1595 | |
ecced8ba | 1596 | err = -EINVAL; |
1da177e4 LT |
1597 | if (msg->msg_namelen < sizeof(*usat) || |
1598 | usat->sat_family != AF_APPLETALK) | |
ecced8ba | 1599 | goto out; |
1da177e4 | 1600 | |
ecced8ba | 1601 | err = -EPERM; |
03ba9991 | 1602 | /* netatalk didn't implement this check */ |
1da177e4 LT |
1603 | if (usat->sat_addr.s_node == ATADDR_BCAST && |
1604 | !sock_flag(sk, SOCK_BROADCAST)) { | |
ecced8ba | 1605 | goto out; |
1da177e4 LT |
1606 | } |
1607 | } else { | |
ecced8ba | 1608 | err = -ENOTCONN; |
1da177e4 | 1609 | if (sk->sk_state != TCP_ESTABLISHED) |
ecced8ba | 1610 | goto out; |
1da177e4 LT |
1611 | usat = &local_satalk; |
1612 | usat->sat_family = AF_APPLETALK; | |
1613 | usat->sat_port = at->dest_port; | |
1614 | usat->sat_addr.s_node = at->dest_node; | |
1615 | usat->sat_addr.s_net = at->dest_net; | |
1616 | } | |
1617 | ||
1618 | /* Build a packet */ | |
1619 | SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); | |
1620 | ||
1621 | /* For headers */ | |
1622 | size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; | |
1623 | ||
1624 | if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { | |
1625 | rt = atrtr_find(&usat->sat_addr); | |
1da177e4 LT |
1626 | } else { |
1627 | struct atalk_addr at_hint; | |
1628 | ||
1629 | at_hint.s_node = 0; | |
1630 | at_hint.s_net = at->src_net; | |
1631 | ||
1632 | rt = atrtr_find(&at_hint); | |
1da177e4 | 1633 | } |
ecced8ba | 1634 | err = ENETUNREACH; |
64233bff | 1635 | if (!rt) |
ecced8ba | 1636 | goto out; |
64233bff OD |
1637 | |
1638 | dev = rt->dev; | |
1da177e4 LT |
1639 | |
1640 | SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", | |
1641 | sk, size, dev->name); | |
1642 | ||
1643 | size += dev->hard_header_len; | |
60d9f461 | 1644 | release_sock(sk); |
1da177e4 | 1645 | skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); |
60d9f461 | 1646 | lock_sock(sk); |
1da177e4 | 1647 | if (!skb) |
ecced8ba | 1648 | goto out; |
ed4477b9 | 1649 | |
1da177e4 LT |
1650 | skb->sk = sk; |
1651 | skb_reserve(skb, ddp_dl->header_length); | |
1652 | skb_reserve(skb, dev->hard_header_len); | |
1653 | skb->dev = dev; | |
1654 | ||
1655 | SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); | |
1656 | ||
1657 | ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr)); | |
2a50f28c | 1658 | ddp->deh_len_hops = htons(len + sizeof(*ddp)); |
1da177e4 LT |
1659 | ddp->deh_dnet = usat->sat_addr.s_net; |
1660 | ddp->deh_snet = at->src_net; | |
1661 | ddp->deh_dnode = usat->sat_addr.s_node; | |
1662 | ddp->deh_snode = at->src_node; | |
1663 | ddp->deh_dport = usat->sat_port; | |
1664 | ddp->deh_sport = at->src_port; | |
1665 | ||
1666 | SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len); | |
1667 | ||
1668 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
1669 | if (err) { | |
1670 | kfree_skb(skb); | |
ecced8ba AB |
1671 | err = -EFAULT; |
1672 | goto out; | |
1da177e4 LT |
1673 | } |
1674 | ||
1675 | if (sk->sk_no_check == 1) | |
1676 | ddp->deh_sum = 0; | |
1677 | else | |
1678 | ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); | |
1679 | ||
1680 | /* | |
1681 | * Loopback broadcast packets to non gateway targets (ie routes | |
1682 | * to group we are in) | |
1683 | */ | |
1684 | if (ddp->deh_dnode == ATADDR_BCAST && | |
1685 | !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { | |
1686 | struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); | |
1687 | ||
1688 | if (skb2) { | |
1689 | loopback = 1; | |
1690 | SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); | |
ffcfb8db ACM |
1691 | /* |
1692 | * If it fails it is queued/sent above in the aarp queue | |
1693 | */ | |
1694 | aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL); | |
1da177e4 LT |
1695 | } |
1696 | } | |
1697 | ||
1698 | if (dev->flags & IFF_LOOPBACK || loopback) { | |
1699 | SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); | |
1700 | /* loop back */ | |
1701 | skb_orphan(skb); | |
64233bff OD |
1702 | if (ddp->deh_dnode == ATADDR_BCAST) { |
1703 | struct atalk_addr at_lo; | |
1704 | ||
1705 | at_lo.s_node = 0; | |
1706 | at_lo.s_net = 0; | |
1707 | ||
1708 | rt = atrtr_find(&at_lo); | |
1709 | if (!rt) { | |
1710 | kfree_skb(skb); | |
ecced8ba AB |
1711 | err = -ENETUNREACH; |
1712 | goto out; | |
64233bff OD |
1713 | } |
1714 | dev = rt->dev; | |
1715 | skb->dev = dev; | |
1716 | } | |
1da177e4 LT |
1717 | ddp_dl->request(ddp_dl, skb, dev->dev_addr); |
1718 | } else { | |
1719 | SOCK_DEBUG(sk, "SK %p: send out.\n", sk); | |
1720 | if (rt->flags & RTF_GATEWAY) { | |
1721 | gsat.sat_addr = rt->gateway; | |
1722 | usat = &gsat; | |
1723 | } | |
1724 | ||
ffcfb8db ACM |
1725 | /* |
1726 | * If it fails it is queued/sent above in the aarp queue | |
1727 | */ | |
1728 | aarp_send_ddp(dev, skb, &usat->sat_addr, NULL); | |
1da177e4 LT |
1729 | } |
1730 | SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len); | |
1731 | ||
ecced8ba | 1732 | out: |
60d9f461 | 1733 | release_sock(sk); |
ecced8ba | 1734 | return err ? : len; |
1da177e4 LT |
1735 | } |
1736 | ||
1737 | static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | |
1738 | size_t size, int flags) | |
1739 | { | |
1740 | struct sock *sk = sock->sk; | |
1741 | struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name; | |
1742 | struct ddpehdr *ddp; | |
1743 | int copied = 0; | |
2a50f28c | 1744 | int offset = 0; |
1da177e4 | 1745 | int err = 0; |
ecced8ba AB |
1746 | struct sk_buff *skb; |
1747 | ||
ecced8ba | 1748 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
1da177e4 | 1749 | flags & MSG_DONTWAIT, &err); |
60d9f461 AB |
1750 | lock_sock(sk); |
1751 | ||
1da177e4 | 1752 | if (!skb) |
ecced8ba | 1753 | goto out; |
1da177e4 LT |
1754 | |
1755 | /* FIXME: use skb->cb to be able to use shared skbs */ | |
1756 | ddp = ddp_hdr(skb); | |
2a50f28c | 1757 | copied = ntohs(ddp->deh_len_hops) & 1023; |
1da177e4 | 1758 | |
2a50f28c AV |
1759 | if (sk->sk_type != SOCK_RAW) { |
1760 | offset = sizeof(*ddp); | |
1761 | copied -= offset; | |
1762 | } | |
1da177e4 | 1763 | |
2a50f28c AV |
1764 | if (copied > size) { |
1765 | copied = size; | |
1766 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 | 1767 | } |
2a50f28c | 1768 | err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied); |
1da177e4 LT |
1769 | |
1770 | if (!err) { | |
1771 | if (sat) { | |
1772 | sat->sat_family = AF_APPLETALK; | |
1773 | sat->sat_port = ddp->deh_sport; | |
1774 | sat->sat_addr.s_node = ddp->deh_snode; | |
1775 | sat->sat_addr.s_net = ddp->deh_snet; | |
1776 | } | |
1777 | msg->msg_namelen = sizeof(*sat); | |
1778 | } | |
1779 | ||
1780 | skb_free_datagram(sk, skb); /* Free the datagram. */ | |
ecced8ba AB |
1781 | |
1782 | out: | |
60d9f461 | 1783 | release_sock(sk); |
1da177e4 LT |
1784 | return err ? : copied; |
1785 | } | |
1786 | ||
1787 | ||
1788 | /* | |
1789 | * AppleTalk ioctl calls. | |
1790 | */ | |
1791 | static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1792 | { | |
b5e5fa5e | 1793 | int rc = -ENOIOCTLCMD; |
1da177e4 LT |
1794 | struct sock *sk = sock->sk; |
1795 | void __user *argp = (void __user *)arg; | |
1796 | ||
1797 | switch (cmd) { | |
1798 | /* Protocol layer */ | |
1799 | case TIOCOUTQ: { | |
31e6d363 | 1800 | long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); |
1da177e4 LT |
1801 | |
1802 | if (amount < 0) | |
1803 | amount = 0; | |
1804 | rc = put_user(amount, (int __user *)argp); | |
1805 | break; | |
1806 | } | |
1807 | case TIOCINQ: { | |
1808 | /* | |
1809 | * These two are safe on a single CPU system as only | |
1810 | * user tasks fiddle here | |
1811 | */ | |
1812 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); | |
1813 | long amount = 0; | |
1814 | ||
1815 | if (skb) | |
1816 | amount = skb->len - sizeof(struct ddpehdr); | |
1817 | rc = put_user(amount, (int __user *)argp); | |
1818 | break; | |
1819 | } | |
1820 | case SIOCGSTAMP: | |
1821 | rc = sock_get_timestamp(sk, argp); | |
1822 | break; | |
ae40eb1e ED |
1823 | case SIOCGSTAMPNS: |
1824 | rc = sock_get_timestampns(sk, argp); | |
1825 | break; | |
1da177e4 LT |
1826 | /* Routing */ |
1827 | case SIOCADDRT: | |
1828 | case SIOCDELRT: | |
1829 | rc = -EPERM; | |
1830 | if (capable(CAP_NET_ADMIN)) | |
1831 | rc = atrtr_ioctl(cmd, argp); | |
1832 | break; | |
1833 | /* Interface */ | |
1834 | case SIOCGIFADDR: | |
1835 | case SIOCSIFADDR: | |
1836 | case SIOCGIFBRDADDR: | |
1837 | case SIOCATALKDIFADDR: | |
1838 | case SIOCDIFADDR: | |
1839 | case SIOCSARP: /* proxy AARP */ | |
1840 | case SIOCDARP: /* proxy AARP */ | |
1841 | rtnl_lock(); | |
1842 | rc = atif_ioctl(cmd, argp); | |
1843 | rtnl_unlock(); | |
1844 | break; | |
1da177e4 LT |
1845 | } |
1846 | ||
1847 | return rc; | |
1848 | } | |
1849 | ||
f6c90b71 PV |
1850 | |
1851 | #ifdef CONFIG_COMPAT | |
1852 | static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1853 | { | |
1854 | /* | |
20660221 AB |
1855 | * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we |
1856 | * cannot handle it in common code. The data we access if ifreq | |
1857 | * here is compatible, so we can simply call the native | |
1858 | * handler. | |
f6c90b71 | 1859 | */ |
20660221 AB |
1860 | if (cmd == SIOCATALKDIFADDR) |
1861 | return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg)); | |
1862 | ||
f6c90b71 PV |
1863 | return -ENOIOCTLCMD; |
1864 | } | |
1865 | #endif | |
1866 | ||
1867 | ||
ec1b4cf7 | 1868 | static const struct net_proto_family atalk_family_ops = { |
1da177e4 LT |
1869 | .family = PF_APPLETALK, |
1870 | .create = atalk_create, | |
1871 | .owner = THIS_MODULE, | |
1872 | }; | |
1873 | ||
ecced8ba | 1874 | static const struct proto_ops atalk_dgram_ops = { |
1da177e4 LT |
1875 | .family = PF_APPLETALK, |
1876 | .owner = THIS_MODULE, | |
1877 | .release = atalk_release, | |
1878 | .bind = atalk_bind, | |
1879 | .connect = atalk_connect, | |
1880 | .socketpair = sock_no_socketpair, | |
1881 | .accept = sock_no_accept, | |
1882 | .getname = atalk_getname, | |
60d9f461 | 1883 | .poll = datagram_poll, |
1da177e4 | 1884 | .ioctl = atalk_ioctl, |
f6c90b71 PV |
1885 | #ifdef CONFIG_COMPAT |
1886 | .compat_ioctl = atalk_compat_ioctl, | |
1887 | #endif | |
1da177e4 LT |
1888 | .listen = sock_no_listen, |
1889 | .shutdown = sock_no_shutdown, | |
1890 | .setsockopt = sock_no_setsockopt, | |
1891 | .getsockopt = sock_no_getsockopt, | |
1892 | .sendmsg = atalk_sendmsg, | |
1893 | .recvmsg = atalk_recvmsg, | |
1894 | .mmap = sock_no_mmap, | |
1895 | .sendpage = sock_no_sendpage, | |
1896 | }; | |
1897 | ||
1da177e4 LT |
1898 | static struct notifier_block ddp_notifier = { |
1899 | .notifier_call = ddp_device_event, | |
1900 | }; | |
1901 | ||
7546dd97 | 1902 | static struct packet_type ltalk_packet_type __read_mostly = { |
09640e63 | 1903 | .type = cpu_to_be16(ETH_P_LOCALTALK), |
1da177e4 LT |
1904 | .func = ltalk_rcv, |
1905 | }; | |
1906 | ||
7546dd97 | 1907 | static struct packet_type ppptalk_packet_type __read_mostly = { |
09640e63 | 1908 | .type = cpu_to_be16(ETH_P_PPPTALK), |
1da177e4 LT |
1909 | .func = atalk_rcv, |
1910 | }; | |
1911 | ||
1912 | static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; | |
1913 | ||
1914 | /* Export symbols for use by drivers when AppleTalk is a module */ | |
1da177e4 LT |
1915 | EXPORT_SYMBOL(atrtr_get_dev); |
1916 | EXPORT_SYMBOL(atalk_find_dev_addr); | |
1917 | ||
2db09608 | 1918 | static const char atalk_err_snap[] __initconst = |
1da177e4 LT |
1919 | KERN_CRIT "Unable to register DDP with SNAP.\n"; |
1920 | ||
1921 | /* Called by proto.c on kernel start up */ | |
1922 | static int __init atalk_init(void) | |
1923 | { | |
1924 | int rc = proto_register(&ddp_proto, 0); | |
1925 | ||
1926 | if (rc != 0) | |
1927 | goto out; | |
1928 | ||
1929 | (void)sock_register(&atalk_family_ops); | |
1930 | ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); | |
1931 | if (!ddp_dl) | |
1932 | printk(atalk_err_snap); | |
1933 | ||
1934 | dev_add_pack(<alk_packet_type); | |
1935 | dev_add_pack(&ppptalk_packet_type); | |
1936 | ||
1937 | register_netdevice_notifier(&ddp_notifier); | |
1938 | aarp_proto_init(); | |
1939 | atalk_proc_init(); | |
1940 | atalk_register_sysctl(); | |
1941 | out: | |
1942 | return rc; | |
1943 | } | |
1944 | module_init(atalk_init); | |
1945 | ||
1946 | /* | |
1947 | * No explicit module reference count manipulation is needed in the | |
1948 | * protocol. Socket layer sets module reference count for us | |
1949 | * and interfaces reference counting is done | |
1950 | * by the network device layer. | |
1951 | * | |
1952 | * Ergo, before the AppleTalk module can be removed, all AppleTalk | |
1953 | * sockets be closed from user space. | |
1954 | */ | |
1955 | static void __exit atalk_exit(void) | |
1956 | { | |
1957 | #ifdef CONFIG_SYSCTL | |
1958 | atalk_unregister_sysctl(); | |
1959 | #endif /* CONFIG_SYSCTL */ | |
1960 | atalk_proc_exit(); | |
1961 | aarp_cleanup_module(); /* General aarp clean-up. */ | |
1962 | unregister_netdevice_notifier(&ddp_notifier); | |
1963 | dev_remove_pack(<alk_packet_type); | |
1964 | dev_remove_pack(&ppptalk_packet_type); | |
1965 | unregister_snap_client(ddp_dl); | |
1966 | sock_unregister(PF_APPLETALK); | |
1967 | proto_unregister(&ddp_proto); | |
1968 | } | |
1969 | module_exit(atalk_exit); | |
1970 | ||
1971 | MODULE_LICENSE("GPL"); | |
113aa838 | 1972 | MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>"); |
1da177e4 LT |
1973 | MODULE_DESCRIPTION("AppleTalk 0.20\n"); |
1974 | MODULE_ALIAS_NETPROTO(PF_APPLETALK); |