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Commit | Line | Data |
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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 | 56 | #include <linux/if_arp.h> |
405f5571 | 57 | #include <linux/smp_lock.h> |
1da177e4 LT |
58 | #include <linux/termios.h> /* For TIOCOUTQ/INQ */ |
59 | #include <net/datalink.h> | |
60 | #include <net/psnap.h> | |
61 | #include <net/sock.h> | |
c752f073 | 62 | #include <net/tcp_states.h> |
1da177e4 LT |
63 | #include <net/route.h> |
64 | #include <linux/atalk.h> | |
a1f8e7f7 | 65 | #include "../core/kmap_skb.h" |
1da177e4 LT |
66 | |
67 | struct datalink_proto *ddp_dl, *aarp_dl; | |
90ddc4f0 | 68 | static const struct proto_ops atalk_dgram_ops; |
1da177e4 LT |
69 | |
70 | /**************************************************************************\ | |
71 | * * | |
72 | * Handlers for the socket list. * | |
73 | * * | |
74 | \**************************************************************************/ | |
75 | ||
76 | HLIST_HEAD(atalk_sockets); | |
77 | DEFINE_RWLOCK(atalk_sockets_lock); | |
78 | ||
79 | static inline void __atalk_insert_socket(struct sock *sk) | |
80 | { | |
81 | sk_add_node(sk, &atalk_sockets); | |
82 | } | |
83 | ||
84 | static inline void atalk_remove_socket(struct sock *sk) | |
85 | { | |
86 | write_lock_bh(&atalk_sockets_lock); | |
87 | sk_del_node_init(sk); | |
88 | write_unlock_bh(&atalk_sockets_lock); | |
89 | } | |
90 | ||
91 | static struct sock *atalk_search_socket(struct sockaddr_at *to, | |
92 | struct atalk_iface *atif) | |
93 | { | |
94 | struct sock *s; | |
95 | struct hlist_node *node; | |
96 | ||
97 | read_lock_bh(&atalk_sockets_lock); | |
98 | sk_for_each(s, node, &atalk_sockets) { | |
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 | |
131 | * @sk - socket to insert in the list if it is not there already | |
132 | * @sat - address to search for | |
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; | |
143 | struct hlist_node *node; | |
144 | struct atalk_sock *at; | |
145 | ||
146 | write_lock_bh(&atalk_sockets_lock); | |
147 | sk_for_each(s, node, &atalk_sockets) { | |
148 | at = at_sk(s); | |
149 | ||
150 | if (at->src_net == sat->sat_addr.s_net && | |
151 | at->src_node == sat->sat_addr.s_node && | |
152 | at->src_port == sat->sat_port) | |
153 | goto found; | |
154 | } | |
155 | s = NULL; | |
156 | __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */ | |
157 | found: | |
158 | write_unlock_bh(&atalk_sockets_lock); | |
159 | return s; | |
160 | } | |
161 | ||
162 | static void atalk_destroy_timer(unsigned long data) | |
163 | { | |
164 | struct sock *sk = (struct sock *)data; | |
165 | ||
c564039f | 166 | if (sk_has_allocations(sk)) { |
1da177e4 LT |
167 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
168 | add_timer(&sk->sk_timer); | |
169 | } else | |
170 | sock_put(sk); | |
171 | } | |
172 | ||
173 | static inline void atalk_destroy_socket(struct sock *sk) | |
174 | { | |
175 | atalk_remove_socket(sk); | |
176 | skb_queue_purge(&sk->sk_receive_queue); | |
177 | ||
c564039f | 178 | if (sk_has_allocations(sk)) { |
b24b8a24 PE |
179 | setup_timer(&sk->sk_timer, atalk_destroy_timer, |
180 | (unsigned long)sk); | |
1da177e4 | 181 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
1da177e4 LT |
182 | add_timer(&sk->sk_timer); |
183 | } else | |
184 | sock_put(sk); | |
185 | } | |
186 | ||
187 | /**************************************************************************\ | |
188 | * * | |
189 | * Routing tables for the AppleTalk socket layer. * | |
190 | * * | |
191 | \**************************************************************************/ | |
192 | ||
193 | /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ | |
194 | struct atalk_route *atalk_routes; | |
195 | DEFINE_RWLOCK(atalk_routes_lock); | |
196 | ||
197 | struct atalk_iface *atalk_interfaces; | |
198 | DEFINE_RWLOCK(atalk_interfaces_lock); | |
199 | ||
200 | /* For probing devices or in a routerless network */ | |
201 | struct atalk_route atrtr_default; | |
202 | ||
203 | /* AppleTalk interface control */ | |
204 | /* | |
205 | * Drop a device. Doesn't drop any of its routes - that is the caller's | |
206 | * problem. Called when we down the interface or delete the address. | |
207 | */ | |
208 | static void atif_drop_device(struct net_device *dev) | |
209 | { | |
210 | struct atalk_iface **iface = &atalk_interfaces; | |
211 | struct atalk_iface *tmp; | |
212 | ||
213 | write_lock_bh(&atalk_interfaces_lock); | |
214 | while ((tmp = *iface) != NULL) { | |
215 | if (tmp->dev == dev) { | |
216 | *iface = tmp->next; | |
217 | dev_put(dev); | |
218 | kfree(tmp); | |
219 | dev->atalk_ptr = NULL; | |
220 | } else | |
221 | iface = &tmp->next; | |
222 | } | |
223 | write_unlock_bh(&atalk_interfaces_lock); | |
224 | } | |
225 | ||
226 | static struct atalk_iface *atif_add_device(struct net_device *dev, | |
227 | struct atalk_addr *sa) | |
228 | { | |
0da974f4 | 229 | struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); |
1da177e4 LT |
230 | |
231 | if (!iface) | |
232 | goto out; | |
233 | ||
1da177e4 LT |
234 | dev_hold(dev); |
235 | iface->dev = dev; | |
236 | dev->atalk_ptr = iface; | |
237 | iface->address = *sa; | |
238 | iface->status = 0; | |
239 | ||
240 | write_lock_bh(&atalk_interfaces_lock); | |
241 | iface->next = atalk_interfaces; | |
242 | atalk_interfaces = iface; | |
243 | write_unlock_bh(&atalk_interfaces_lock); | |
244 | out: | |
245 | return iface; | |
246 | } | |
247 | ||
248 | /* Perform phase 2 AARP probing on our tentative address */ | |
249 | static int atif_probe_device(struct atalk_iface *atif) | |
250 | { | |
251 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
252 | ntohs(atif->nets.nr_firstnet) + 1; | |
253 | int probe_net = ntohs(atif->address.s_net); | |
254 | int probe_node = atif->address.s_node; | |
255 | int netct, nodect; | |
256 | ||
257 | /* Offset the network we start probing with */ | |
258 | if (probe_net == ATADDR_ANYNET) { | |
259 | probe_net = ntohs(atif->nets.nr_firstnet); | |
260 | if (netrange) | |
261 | probe_net += jiffies % netrange; | |
262 | } | |
263 | if (probe_node == ATADDR_ANYNODE) | |
264 | probe_node = jiffies & 0xFF; | |
265 | ||
266 | /* Scan the networks */ | |
267 | atif->status |= ATIF_PROBE; | |
268 | for (netct = 0; netct <= netrange; netct++) { | |
269 | /* Sweep the available nodes from a given start */ | |
270 | atif->address.s_net = htons(probe_net); | |
271 | for (nodect = 0; nodect < 256; nodect++) { | |
272 | atif->address.s_node = (nodect + probe_node) & 0xFF; | |
273 | if (atif->address.s_node > 0 && | |
274 | atif->address.s_node < 254) { | |
275 | /* Probe a proposed address */ | |
276 | aarp_probe_network(atif); | |
277 | ||
278 | if (!(atif->status & ATIF_PROBE_FAIL)) { | |
279 | atif->status &= ~ATIF_PROBE; | |
280 | return 0; | |
281 | } | |
282 | } | |
283 | atif->status &= ~ATIF_PROBE_FAIL; | |
284 | } | |
285 | probe_net++; | |
286 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
287 | probe_net = ntohs(atif->nets.nr_firstnet); | |
288 | } | |
289 | atif->status &= ~ATIF_PROBE; | |
290 | ||
291 | return -EADDRINUSE; /* Network is full... */ | |
292 | } | |
293 | ||
294 | ||
295 | /* Perform AARP probing for a proxy address */ | |
296 | static int atif_proxy_probe_device(struct atalk_iface *atif, | |
297 | struct atalk_addr* proxy_addr) | |
298 | { | |
299 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
300 | ntohs(atif->nets.nr_firstnet) + 1; | |
301 | /* we probe the interface's network */ | |
302 | int probe_net = ntohs(atif->address.s_net); | |
303 | int probe_node = ATADDR_ANYNODE; /* we'll take anything */ | |
304 | int netct, nodect; | |
305 | ||
306 | /* Offset the network we start probing with */ | |
307 | if (probe_net == ATADDR_ANYNET) { | |
308 | probe_net = ntohs(atif->nets.nr_firstnet); | |
309 | if (netrange) | |
310 | probe_net += jiffies % netrange; | |
311 | } | |
312 | ||
313 | if (probe_node == ATADDR_ANYNODE) | |
314 | probe_node = jiffies & 0xFF; | |
ed4477b9 | 315 | |
1da177e4 LT |
316 | /* Scan the networks */ |
317 | for (netct = 0; netct <= netrange; netct++) { | |
318 | /* Sweep the available nodes from a given start */ | |
319 | proxy_addr->s_net = htons(probe_net); | |
320 | for (nodect = 0; nodect < 256; nodect++) { | |
321 | proxy_addr->s_node = (nodect + probe_node) & 0xFF; | |
322 | if (proxy_addr->s_node > 0 && | |
323 | proxy_addr->s_node < 254) { | |
324 | /* Tell AARP to probe a proposed address */ | |
325 | int ret = aarp_proxy_probe_network(atif, | |
326 | proxy_addr); | |
327 | ||
328 | if (ret != -EADDRINUSE) | |
329 | return ret; | |
330 | } | |
331 | } | |
332 | probe_net++; | |
333 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
334 | probe_net = ntohs(atif->nets.nr_firstnet); | |
335 | } | |
336 | ||
337 | return -EADDRINUSE; /* Network is full... */ | |
338 | } | |
339 | ||
340 | ||
341 | struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) | |
342 | { | |
343 | struct atalk_iface *iface = dev->atalk_ptr; | |
344 | return iface ? &iface->address : NULL; | |
345 | } | |
346 | ||
347 | static struct atalk_addr *atalk_find_primary(void) | |
348 | { | |
349 | struct atalk_iface *fiface = NULL; | |
350 | struct atalk_addr *retval; | |
351 | struct atalk_iface *iface; | |
352 | ||
353 | /* | |
354 | * Return a point-to-point interface only if | |
355 | * there is no non-ptp interface available. | |
356 | */ | |
357 | read_lock_bh(&atalk_interfaces_lock); | |
358 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
359 | if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) | |
360 | fiface = iface; | |
361 | if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { | |
362 | retval = &iface->address; | |
363 | goto out; | |
364 | } | |
365 | } | |
366 | ||
367 | if (fiface) | |
368 | retval = &fiface->address; | |
369 | else if (atalk_interfaces) | |
370 | retval = &atalk_interfaces->address; | |
371 | else | |
372 | retval = NULL; | |
373 | out: | |
374 | read_unlock_bh(&atalk_interfaces_lock); | |
375 | return retval; | |
376 | } | |
377 | ||
378 | /* | |
379 | * Find a match for 'any network' - ie any of our interfaces with that | |
380 | * node number will do just nicely. | |
381 | */ | |
382 | static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) | |
383 | { | |
384 | struct atalk_iface *iface = dev->atalk_ptr; | |
385 | ||
386 | if (!iface || iface->status & ATIF_PROBE) | |
387 | goto out_err; | |
388 | ||
389 | if (node != ATADDR_BCAST && | |
390 | iface->address.s_node != node && | |
391 | node != ATADDR_ANYNODE) | |
392 | goto out_err; | |
393 | out: | |
394 | return iface; | |
395 | out_err: | |
396 | iface = NULL; | |
397 | goto out; | |
398 | } | |
399 | ||
400 | /* Find a match for a specific network:node pair */ | |
f6e276ee | 401 | static struct atalk_iface *atalk_find_interface(__be16 net, int node) |
1da177e4 LT |
402 | { |
403 | struct atalk_iface *iface; | |
404 | ||
405 | read_lock_bh(&atalk_interfaces_lock); | |
406 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
407 | if ((node == ATADDR_BCAST || | |
408 | node == ATADDR_ANYNODE || | |
409 | iface->address.s_node == node) && | |
410 | iface->address.s_net == net && | |
411 | !(iface->status & ATIF_PROBE)) | |
412 | break; | |
413 | ||
414 | /* XXXX.0 -- net.0 returns the iface associated with net */ | |
415 | if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && | |
416 | ntohs(iface->nets.nr_firstnet) <= ntohs(net) && | |
417 | ntohs(net) <= ntohs(iface->nets.nr_lastnet)) | |
ed4477b9 | 418 | break; |
1da177e4 LT |
419 | } |
420 | read_unlock_bh(&atalk_interfaces_lock); | |
421 | return iface; | |
422 | } | |
423 | ||
424 | ||
425 | /* | |
426 | * Find a route for an AppleTalk packet. This ought to get cached in | |
427 | * the socket (later on...). We know about host routes and the fact | |
428 | * that a route must be direct to broadcast. | |
429 | */ | |
430 | static struct atalk_route *atrtr_find(struct atalk_addr *target) | |
431 | { | |
432 | /* | |
ed4477b9 | 433 | * we must search through all routes unless we find a |
1da177e4 LT |
434 | * host route, because some host routes might overlap |
435 | * network routes | |
436 | */ | |
437 | struct atalk_route *net_route = NULL; | |
438 | struct atalk_route *r; | |
ed4477b9 | 439 | |
1da177e4 LT |
440 | read_lock_bh(&atalk_routes_lock); |
441 | for (r = atalk_routes; r; r = r->next) { | |
442 | if (!(r->flags & RTF_UP)) | |
443 | continue; | |
444 | ||
445 | if (r->target.s_net == target->s_net) { | |
446 | if (r->flags & RTF_HOST) { | |
447 | /* | |
448 | * if this host route is for the target, | |
449 | * the we're done | |
450 | */ | |
451 | if (r->target.s_node == target->s_node) | |
452 | goto out; | |
453 | } else | |
454 | /* | |
455 | * this route will work if there isn't a | |
456 | * direct host route, so cache it | |
457 | */ | |
458 | net_route = r; | |
459 | } | |
460 | } | |
ed4477b9 YH |
461 | |
462 | /* | |
1da177e4 LT |
463 | * if we found a network route but not a direct host |
464 | * route, then return it | |
465 | */ | |
466 | if (net_route) | |
467 | r = net_route; | |
468 | else if (atrtr_default.dev) | |
469 | r = &atrtr_default; | |
470 | else /* No route can be found */ | |
471 | r = NULL; | |
472 | out: | |
473 | read_unlock_bh(&atalk_routes_lock); | |
474 | return r; | |
475 | } | |
476 | ||
477 | ||
478 | /* | |
479 | * Given an AppleTalk network, find the device to use. This can be | |
480 | * a simple lookup. | |
481 | */ | |
482 | struct net_device *atrtr_get_dev(struct atalk_addr *sa) | |
483 | { | |
484 | struct atalk_route *atr = atrtr_find(sa); | |
485 | return atr ? atr->dev : NULL; | |
486 | } | |
487 | ||
488 | /* Set up a default router */ | |
489 | static void atrtr_set_default(struct net_device *dev) | |
490 | { | |
491 | atrtr_default.dev = dev; | |
492 | atrtr_default.flags = RTF_UP; | |
493 | atrtr_default.gateway.s_net = htons(0); | |
494 | atrtr_default.gateway.s_node = 0; | |
495 | } | |
496 | ||
497 | /* | |
498 | * Add a router. Basically make sure it looks valid and stuff the | |
499 | * entry in the list. While it uses netranges we always set them to one | |
500 | * entry to work like netatalk. | |
501 | */ | |
502 | static int atrtr_create(struct rtentry *r, struct net_device *devhint) | |
503 | { | |
504 | struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; | |
505 | struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; | |
506 | struct atalk_route *rt; | |
507 | struct atalk_iface *iface, *riface; | |
508 | int retval = -EINVAL; | |
509 | ||
510 | /* | |
511 | * Fixme: Raise/Lower a routing change semaphore for these | |
512 | * operations. | |
513 | */ | |
514 | ||
515 | /* Validate the request */ | |
516 | if (ta->sat_family != AF_APPLETALK || | |
517 | (!devhint && ga->sat_family != AF_APPLETALK)) | |
518 | goto out; | |
519 | ||
520 | /* Now walk the routing table and make our decisions */ | |
521 | write_lock_bh(&atalk_routes_lock); | |
522 | for (rt = atalk_routes; rt; rt = rt->next) { | |
523 | if (r->rt_flags != rt->flags) | |
524 | continue; | |
525 | ||
526 | if (ta->sat_addr.s_net == rt->target.s_net) { | |
527 | if (!(rt->flags & RTF_HOST)) | |
528 | break; | |
529 | if (ta->sat_addr.s_node == rt->target.s_node) | |
530 | break; | |
531 | } | |
532 | } | |
533 | ||
534 | if (!devhint) { | |
535 | riface = NULL; | |
536 | ||
537 | read_lock_bh(&atalk_interfaces_lock); | |
538 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
539 | if (!riface && | |
540 | ntohs(ga->sat_addr.s_net) >= | |
ed4477b9 | 541 | ntohs(iface->nets.nr_firstnet) && |
1da177e4 | 542 | ntohs(ga->sat_addr.s_net) <= |
ed4477b9 | 543 | ntohs(iface->nets.nr_lastnet)) |
1da177e4 LT |
544 | riface = iface; |
545 | ||
546 | if (ga->sat_addr.s_net == iface->address.s_net && | |
547 | ga->sat_addr.s_node == iface->address.s_node) | |
548 | riface = iface; | |
ed4477b9 | 549 | } |
1da177e4 LT |
550 | read_unlock_bh(&atalk_interfaces_lock); |
551 | ||
552 | retval = -ENETUNREACH; | |
553 | if (!riface) | |
554 | goto out_unlock; | |
555 | ||
556 | devhint = riface->dev; | |
557 | } | |
558 | ||
559 | if (!rt) { | |
0da974f4 | 560 | rt = kzalloc(sizeof(*rt), GFP_ATOMIC); |
1da177e4 LT |
561 | |
562 | retval = -ENOBUFS; | |
563 | if (!rt) | |
564 | goto out_unlock; | |
1da177e4 LT |
565 | |
566 | rt->next = atalk_routes; | |
567 | atalk_routes = rt; | |
568 | } | |
569 | ||
570 | /* Fill in the routing entry */ | |
571 | rt->target = ta->sat_addr; | |
c7f905f0 | 572 | dev_hold(devhint); |
1da177e4 LT |
573 | rt->dev = devhint; |
574 | rt->flags = r->rt_flags; | |
575 | rt->gateway = ga->sat_addr; | |
576 | ||
577 | retval = 0; | |
578 | out_unlock: | |
579 | write_unlock_bh(&atalk_routes_lock); | |
580 | out: | |
581 | return retval; | |
582 | } | |
583 | ||
584 | /* Delete a route. Find it and discard it */ | |
585 | static int atrtr_delete(struct atalk_addr * addr) | |
586 | { | |
587 | struct atalk_route **r = &atalk_routes; | |
588 | int retval = 0; | |
589 | struct atalk_route *tmp; | |
590 | ||
591 | write_lock_bh(&atalk_routes_lock); | |
592 | while ((tmp = *r) != NULL) { | |
593 | if (tmp->target.s_net == addr->s_net && | |
594 | (!(tmp->flags&RTF_GATEWAY) || | |
595 | tmp->target.s_node == addr->s_node)) { | |
596 | *r = tmp->next; | |
597 | dev_put(tmp->dev); | |
598 | kfree(tmp); | |
599 | goto out; | |
600 | } | |
601 | r = &tmp->next; | |
602 | } | |
603 | retval = -ENOENT; | |
604 | out: | |
605 | write_unlock_bh(&atalk_routes_lock); | |
606 | return retval; | |
607 | } | |
608 | ||
609 | /* | |
610 | * Called when a device is downed. Just throw away any routes | |
611 | * via it. | |
612 | */ | |
613 | static void atrtr_device_down(struct net_device *dev) | |
614 | { | |
615 | struct atalk_route **r = &atalk_routes; | |
616 | struct atalk_route *tmp; | |
617 | ||
618 | write_lock_bh(&atalk_routes_lock); | |
619 | while ((tmp = *r) != NULL) { | |
620 | if (tmp->dev == dev) { | |
621 | *r = tmp->next; | |
622 | dev_put(dev); | |
623 | kfree(tmp); | |
624 | } else | |
625 | r = &tmp->next; | |
626 | } | |
627 | write_unlock_bh(&atalk_routes_lock); | |
628 | ||
629 | if (atrtr_default.dev == dev) | |
630 | atrtr_set_default(NULL); | |
631 | } | |
632 | ||
633 | /* Actually down the interface */ | |
634 | static inline void atalk_dev_down(struct net_device *dev) | |
635 | { | |
636 | atrtr_device_down(dev); /* Remove all routes for the device */ | |
637 | aarp_device_down(dev); /* Remove AARP entries for the device */ | |
638 | atif_drop_device(dev); /* Remove the device */ | |
639 | } | |
640 | ||
641 | /* | |
642 | * A device event has occurred. Watch for devices going down and | |
643 | * delete our use of them (iface and route). | |
644 | */ | |
645 | static int ddp_device_event(struct notifier_block *this, unsigned long event, | |
646 | void *ptr) | |
647 | { | |
890d52d3 EB |
648 | struct net_device *dev = ptr; |
649 | ||
721499e8 | 650 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
651 | return NOTIFY_DONE; |
652 | ||
1da177e4 LT |
653 | if (event == NETDEV_DOWN) |
654 | /* Discard any use of this */ | |
890d52d3 | 655 | atalk_dev_down(dev); |
1da177e4 LT |
656 | |
657 | return NOTIFY_DONE; | |
658 | } | |
659 | ||
660 | /* ioctl calls. Shouldn't even need touching */ | |
661 | /* Device configuration ioctl calls */ | |
662 | static int atif_ioctl(int cmd, void __user *arg) | |
663 | { | |
664 | static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; | |
665 | struct ifreq atreq; | |
666 | struct atalk_netrange *nr; | |
667 | struct sockaddr_at *sa; | |
668 | struct net_device *dev; | |
669 | struct atalk_iface *atif; | |
670 | int ct; | |
671 | int limit; | |
672 | struct rtentry rtdef; | |
673 | int add_route; | |
674 | ||
675 | if (copy_from_user(&atreq, arg, sizeof(atreq))) | |
676 | return -EFAULT; | |
677 | ||
881d966b | 678 | dev = __dev_get_by_name(&init_net, atreq.ifr_name); |
1da177e4 LT |
679 | if (!dev) |
680 | return -ENODEV; | |
681 | ||
682 | sa = (struct sockaddr_at *)&atreq.ifr_addr; | |
683 | atif = atalk_find_dev(dev); | |
684 | ||
685 | switch (cmd) { | |
686 | case SIOCSIFADDR: | |
687 | if (!capable(CAP_NET_ADMIN)) | |
688 | return -EPERM; | |
689 | if (sa->sat_family != AF_APPLETALK) | |
690 | return -EINVAL; | |
691 | if (dev->type != ARPHRD_ETHER && | |
692 | dev->type != ARPHRD_LOOPBACK && | |
693 | dev->type != ARPHRD_LOCALTLK && | |
694 | dev->type != ARPHRD_PPP) | |
695 | return -EPROTONOSUPPORT; | |
696 | ||
697 | nr = (struct atalk_netrange *)&sa->sat_zero[0]; | |
698 | add_route = 1; | |
699 | ||
700 | /* | |
701 | * if this is a point-to-point iface, and we already | |
702 | * have an iface for this AppleTalk address, then we | |
703 | * should not add a route | |
704 | */ | |
705 | if ((dev->flags & IFF_POINTOPOINT) && | |
706 | atalk_find_interface(sa->sat_addr.s_net, | |
ed4477b9 | 707 | sa->sat_addr.s_node)) { |
1da177e4 LT |
708 | printk(KERN_DEBUG "AppleTalk: point-to-point " |
709 | "interface added with " | |
710 | "existing address\n"); | |
711 | add_route = 0; | |
712 | } | |
ed4477b9 | 713 | |
1da177e4 LT |
714 | /* |
715 | * Phase 1 is fine on LocalTalk but we don't do | |
716 | * EtherTalk phase 1. Anyone wanting to add it go ahead. | |
717 | */ | |
718 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
719 | return -EPROTONOSUPPORT; | |
720 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
721 | sa->sat_addr.s_node == 254) | |
722 | return -EINVAL; | |
723 | if (atif) { | |
724 | /* Already setting address */ | |
725 | if (atif->status & ATIF_PROBE) | |
726 | return -EBUSY; | |
727 | ||
728 | atif->address.s_net = sa->sat_addr.s_net; | |
729 | atif->address.s_node = sa->sat_addr.s_node; | |
730 | atrtr_device_down(dev); /* Flush old routes */ | |
731 | } else { | |
732 | atif = atif_add_device(dev, &sa->sat_addr); | |
733 | if (!atif) | |
734 | return -ENOMEM; | |
735 | } | |
736 | atif->nets = *nr; | |
737 | ||
738 | /* | |
739 | * Check if the chosen address is used. If so we | |
740 | * error and atalkd will try another. | |
741 | */ | |
742 | ||
743 | if (!(dev->flags & IFF_LOOPBACK) && | |
744 | !(dev->flags & IFF_POINTOPOINT) && | |
745 | atif_probe_device(atif) < 0) { | |
746 | atif_drop_device(dev); | |
747 | return -EADDRINUSE; | |
748 | } | |
749 | ||
750 | /* Hey it worked - add the direct routes */ | |
751 | sa = (struct sockaddr_at *)&rtdef.rt_gateway; | |
752 | sa->sat_family = AF_APPLETALK; | |
753 | sa->sat_addr.s_net = atif->address.s_net; | |
754 | sa->sat_addr.s_node = atif->address.s_node; | |
755 | sa = (struct sockaddr_at *)&rtdef.rt_dst; | |
756 | rtdef.rt_flags = RTF_UP; | |
757 | sa->sat_family = AF_APPLETALK; | |
758 | sa->sat_addr.s_node = ATADDR_ANYNODE; | |
759 | if (dev->flags & IFF_LOOPBACK || | |
760 | dev->flags & IFF_POINTOPOINT) | |
761 | rtdef.rt_flags |= RTF_HOST; | |
762 | ||
763 | /* Routerless initial state */ | |
764 | if (nr->nr_firstnet == htons(0) && | |
765 | nr->nr_lastnet == htons(0xFFFE)) { | |
766 | sa->sat_addr.s_net = atif->address.s_net; | |
767 | atrtr_create(&rtdef, dev); | |
768 | atrtr_set_default(dev); | |
769 | } else { | |
770 | limit = ntohs(nr->nr_lastnet); | |
771 | if (limit - ntohs(nr->nr_firstnet) > 4096) { | |
772 | printk(KERN_WARNING "Too many routes/" | |
773 | "iface.\n"); | |
774 | return -EINVAL; | |
775 | } | |
776 | if (add_route) | |
777 | for (ct = ntohs(nr->nr_firstnet); | |
778 | ct <= limit; ct++) { | |
779 | sa->sat_addr.s_net = htons(ct); | |
780 | atrtr_create(&rtdef, dev); | |
781 | } | |
782 | } | |
783 | dev_mc_add(dev, aarp_mcast, 6, 1); | |
784 | return 0; | |
785 | ||
786 | case SIOCGIFADDR: | |
787 | if (!atif) | |
788 | return -EADDRNOTAVAIL; | |
789 | ||
790 | sa->sat_family = AF_APPLETALK; | |
791 | sa->sat_addr = atif->address; | |
792 | break; | |
793 | ||
794 | case SIOCGIFBRDADDR: | |
795 | if (!atif) | |
796 | return -EADDRNOTAVAIL; | |
797 | ||
798 | sa->sat_family = AF_APPLETALK; | |
799 | sa->sat_addr.s_net = atif->address.s_net; | |
800 | sa->sat_addr.s_node = ATADDR_BCAST; | |
801 | break; | |
802 | ||
ed4477b9 YH |
803 | case SIOCATALKDIFADDR: |
804 | case SIOCDIFADDR: | |
1da177e4 LT |
805 | if (!capable(CAP_NET_ADMIN)) |
806 | return -EPERM; | |
807 | if (sa->sat_family != AF_APPLETALK) | |
808 | return -EINVAL; | |
809 | atalk_dev_down(dev); | |
ed4477b9 | 810 | break; |
1da177e4 LT |
811 | |
812 | case SIOCSARP: | |
813 | if (!capable(CAP_NET_ADMIN)) | |
ed4477b9 YH |
814 | return -EPERM; |
815 | if (sa->sat_family != AF_APPLETALK) | |
816 | return -EINVAL; | |
ed4477b9 YH |
817 | /* |
818 | * for now, we only support proxy AARP on ELAP; | |
819 | * we should be able to do it for LocalTalk, too. | |
820 | */ | |
821 | if (dev->type != ARPHRD_ETHER) | |
822 | return -EPROTONOSUPPORT; | |
823 | ||
824 | /* | |
825 | * atif points to the current interface on this network; | |
826 | * we aren't concerned about its current status (at | |
1da177e4 LT |
827 | * least for now), but it has all the settings about |
828 | * the network we're going to probe. Consequently, it | |
829 | * must exist. | |
ed4477b9 YH |
830 | */ |
831 | if (!atif) | |
832 | return -EADDRNOTAVAIL; | |
833 | ||
834 | nr = (struct atalk_netrange *)&(atif->nets); | |
835 | /* | |
836 | * Phase 1 is fine on Localtalk but we don't do | |
837 | * Ethertalk phase 1. Anyone wanting to add it go ahead. | |
838 | */ | |
839 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
840 | return -EPROTONOSUPPORT; | |
841 | ||
842 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
1da177e4 | 843 | sa->sat_addr.s_node == 254) |
ed4477b9 YH |
844 | return -EINVAL; |
845 | ||
846 | /* | |
847 | * Check if the chosen address is used. If so we | |
848 | * error and ATCP will try another. | |
849 | */ | |
850 | if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) | |
851 | return -EADDRINUSE; | |
852 | ||
1da177e4 | 853 | /* |
ed4477b9 | 854 | * We now have an address on the local network, and |
1da177e4 LT |
855 | * the AARP code will defend it for us until we take it |
856 | * down. We don't set up any routes right now, because | |
857 | * ATCP will install them manually via SIOCADDRT. | |
ed4477b9 YH |
858 | */ |
859 | break; | |
860 | ||
861 | case SIOCDARP: | |
862 | if (!capable(CAP_NET_ADMIN)) | |
863 | return -EPERM; | |
864 | if (sa->sat_family != AF_APPLETALK) | |
865 | return -EINVAL; | |
866 | if (!atif) | |
867 | return -EADDRNOTAVAIL; | |
868 | ||
869 | /* give to aarp module to remove proxy entry */ | |
870 | aarp_proxy_remove(atif->dev, &(sa->sat_addr)); | |
871 | return 0; | |
1da177e4 LT |
872 | } |
873 | ||
874 | return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; | |
875 | } | |
876 | ||
877 | /* Routing ioctl() calls */ | |
878 | static int atrtr_ioctl(unsigned int cmd, void __user *arg) | |
879 | { | |
880 | struct rtentry rt; | |
881 | ||
882 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
883 | return -EFAULT; | |
884 | ||
885 | switch (cmd) { | |
886 | case SIOCDELRT: | |
887 | if (rt.rt_dst.sa_family != AF_APPLETALK) | |
888 | return -EINVAL; | |
889 | return atrtr_delete(&((struct sockaddr_at *) | |
890 | &rt.rt_dst)->sat_addr); | |
891 | ||
892 | case SIOCADDRT: { | |
893 | struct net_device *dev = NULL; | |
894 | if (rt.rt_dev) { | |
895 | char name[IFNAMSIZ]; | |
896 | if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1)) | |
897 | return -EFAULT; | |
898 | name[IFNAMSIZ-1] = '\0'; | |
881d966b | 899 | dev = __dev_get_by_name(&init_net, name); |
1da177e4 LT |
900 | if (!dev) |
901 | return -ENODEV; | |
ed4477b9 | 902 | } |
1da177e4 LT |
903 | return atrtr_create(&rt, dev); |
904 | } | |
905 | } | |
906 | return -EINVAL; | |
907 | } | |
908 | ||
909 | /**************************************************************************\ | |
910 | * * | |
911 | * Handling for system calls applied via the various interfaces to an * | |
912 | * AppleTalk socket object. * | |
913 | * * | |
914 | \**************************************************************************/ | |
915 | ||
916 | /* | |
917 | * Checksum: This is 'optional'. It's quite likely also a good | |
918 | * candidate for assembler hackery 8) | |
919 | */ | |
ed4477b9 | 920 | static unsigned long atalk_sum_partial(const unsigned char *data, |
1da177e4 LT |
921 | int len, unsigned long sum) |
922 | { | |
923 | /* This ought to be unwrapped neatly. I'll trust gcc for now */ | |
924 | while (len--) { | |
925 | sum += *data; | |
926 | sum <<= 1; | |
927 | if (sum & 0x10000) { | |
928 | sum++; | |
929 | sum &= 0xffff; | |
930 | } | |
931 | data++; | |
932 | } | |
933 | return sum; | |
934 | } | |
935 | ||
936 | /* Checksum skb data -- similar to skb_checksum */ | |
937 | static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, | |
938 | int len, unsigned long sum) | |
939 | { | |
1a028e50 | 940 | int start = skb_headlen(skb); |
c32ba3f9 | 941 | struct sk_buff *frag_iter; |
1da177e4 LT |
942 | int i, copy; |
943 | ||
944 | /* checksum stuff in header space */ | |
1a028e50 | 945 | if ( (copy = start - offset) > 0) { |
1da177e4 LT |
946 | if (copy > len) |
947 | copy = len; | |
948 | sum = atalk_sum_partial(skb->data + offset, copy, sum); | |
ed4477b9 | 949 | if ( (len -= copy) == 0) |
1da177e4 LT |
950 | return sum; |
951 | ||
952 | offset += copy; | |
953 | } | |
954 | ||
955 | /* checksum stuff in frags */ | |
956 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1a028e50 | 957 | int end; |
1da177e4 | 958 | |
547b792c | 959 | WARN_ON(start > offset + len); |
1a028e50 DM |
960 | |
961 | end = start + skb_shinfo(skb)->frags[i].size; | |
1da177e4 LT |
962 | if ((copy = end - offset) > 0) { |
963 | u8 *vaddr; | |
964 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
965 | ||
966 | if (copy > len) | |
967 | copy = len; | |
968 | vaddr = kmap_skb_frag(frag); | |
1a028e50 DM |
969 | sum = atalk_sum_partial(vaddr + frag->page_offset + |
970 | offset - start, copy, sum); | |
1da177e4 LT |
971 | kunmap_skb_frag(vaddr); |
972 | ||
973 | if (!(len -= copy)) | |
974 | return sum; | |
975 | offset += copy; | |
976 | } | |
1a028e50 | 977 | start = end; |
1da177e4 LT |
978 | } |
979 | ||
c32ba3f9 DM |
980 | skb_walk_frags(skb, frag_iter) { |
981 | int end; | |
1a028e50 | 982 | |
c32ba3f9 | 983 | WARN_ON(start > offset + len); |
1da177e4 | 984 | |
c32ba3f9 DM |
985 | end = start + frag_iter->len; |
986 | if ((copy = end - offset) > 0) { | |
987 | if (copy > len) | |
988 | copy = len; | |
989 | sum = atalk_sum_skb(frag_iter, offset - start, | |
990 | copy, sum); | |
991 | if ((len -= copy) == 0) | |
992 | return sum; | |
993 | offset += copy; | |
1da177e4 | 994 | } |
c32ba3f9 | 995 | start = end; |
1da177e4 LT |
996 | } |
997 | ||
998 | BUG_ON(len > 0); | |
999 | ||
1000 | return sum; | |
1001 | } | |
1002 | ||
2a50f28c | 1003 | static __be16 atalk_checksum(const struct sk_buff *skb, int len) |
1da177e4 LT |
1004 | { |
1005 | unsigned long sum; | |
1006 | ||
1007 | /* skip header 4 bytes */ | |
1008 | sum = atalk_sum_skb(skb, 4, len-4, 0); | |
1009 | ||
1010 | /* Use 0xFFFF for 0. 0 itself means none */ | |
2a50f28c | 1011 | return sum ? htons((unsigned short)sum) : htons(0xFFFF); |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | static struct proto ddp_proto = { | |
1015 | .name = "DDP", | |
1016 | .owner = THIS_MODULE, | |
1017 | .obj_size = sizeof(struct atalk_sock), | |
1018 | }; | |
1019 | ||
1020 | /* | |
1021 | * Create a socket. Initialise the socket, blank the addresses | |
1022 | * set the state. | |
1023 | */ | |
1b8d7ae4 | 1024 | static int atalk_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
1025 | { |
1026 | struct sock *sk; | |
1027 | int rc = -ESOCKTNOSUPPORT; | |
1028 | ||
1b8d7ae4 EB |
1029 | if (net != &init_net) |
1030 | return -EAFNOSUPPORT; | |
1031 | ||
1da177e4 LT |
1032 | /* |
1033 | * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do | |
ed4477b9 | 1034 | * and gives you the full ELAP frame. Should be handy for CAP 8) |
1da177e4 LT |
1035 | */ |
1036 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) | |
1037 | goto out; | |
1038 | rc = -ENOMEM; | |
6257ff21 | 1039 | sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto); |
1da177e4 LT |
1040 | if (!sk) |
1041 | goto out; | |
1042 | rc = 0; | |
1043 | sock->ops = &atalk_dgram_ops; | |
1044 | sock_init_data(sock, sk); | |
1045 | ||
1046 | /* Checksums on by default */ | |
1047 | sock_set_flag(sk, SOCK_ZAPPED); | |
1048 | out: | |
1049 | return rc; | |
1050 | } | |
1051 | ||
1052 | /* Free a socket. No work needed */ | |
1053 | static int atalk_release(struct socket *sock) | |
1054 | { | |
1055 | struct sock *sk = sock->sk; | |
1056 | ||
1057 | if (sk) { | |
1058 | sock_orphan(sk); | |
1059 | sock->sk = NULL; | |
1060 | atalk_destroy_socket(sk); | |
1061 | } | |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | /** | |
1066 | * atalk_pick_and_bind_port - Pick a source port when one is not given | |
1067 | * @sk - socket to insert into the tables | |
1068 | * @sat - address to search for | |
1069 | * | |
1070 | * Pick a source port when one is not given. If we can find a suitable free | |
1071 | * one, we insert the socket into the tables using it. | |
1072 | * | |
1073 | * This whole operation must be atomic. | |
1074 | */ | |
1075 | static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat) | |
1076 | { | |
1077 | int retval; | |
1078 | ||
1079 | write_lock_bh(&atalk_sockets_lock); | |
1080 | ||
1081 | for (sat->sat_port = ATPORT_RESERVED; | |
1082 | sat->sat_port < ATPORT_LAST; | |
1083 | sat->sat_port++) { | |
1084 | struct sock *s; | |
1085 | struct hlist_node *node; | |
1086 | ||
1087 | sk_for_each(s, node, &atalk_sockets) { | |
1088 | struct atalk_sock *at = at_sk(s); | |
1089 | ||
1090 | if (at->src_net == sat->sat_addr.s_net && | |
1091 | at->src_node == sat->sat_addr.s_node && | |
1092 | at->src_port == sat->sat_port) | |
1093 | goto try_next_port; | |
1094 | } | |
1095 | ||
1096 | /* Wheee, it's free, assign and insert. */ | |
1097 | __atalk_insert_socket(sk); | |
1098 | at_sk(sk)->src_port = sat->sat_port; | |
1099 | retval = 0; | |
1100 | goto out; | |
1101 | ||
1102 | try_next_port:; | |
1103 | } | |
1104 | ||
1105 | retval = -EBUSY; | |
1106 | out: | |
1107 | write_unlock_bh(&atalk_sockets_lock); | |
1108 | return retval; | |
1109 | } | |
1110 | ||
1111 | static int atalk_autobind(struct sock *sk) | |
1112 | { | |
1113 | struct atalk_sock *at = at_sk(sk); | |
1114 | struct sockaddr_at sat; | |
1115 | struct atalk_addr *ap = atalk_find_primary(); | |
1116 | int n = -EADDRNOTAVAIL; | |
1117 | ||
1118 | if (!ap || ap->s_net == htons(ATADDR_ANYNET)) | |
1119 | goto out; | |
1120 | ||
1121 | at->src_net = sat.sat_addr.s_net = ap->s_net; | |
1122 | at->src_node = sat.sat_addr.s_node = ap->s_node; | |
1123 | ||
1124 | n = atalk_pick_and_bind_port(sk, &sat); | |
1125 | if (!n) | |
1126 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1127 | out: | |
1128 | return n; | |
1129 | } | |
1130 | ||
1131 | /* Set the address 'our end' of the connection */ | |
1132 | static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1133 | { | |
1134 | struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; | |
1135 | struct sock *sk = sock->sk; | |
1136 | struct atalk_sock *at = at_sk(sk); | |
1137 | ||
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 | ||
1145 | if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { | |
1146 | struct atalk_addr *ap = atalk_find_primary(); | |
1147 | ||
1148 | if (!ap) | |
1149 | return -EADDRNOTAVAIL; | |
1150 | ||
1151 | at->src_net = addr->sat_addr.s_net = ap->s_net; | |
1152 | at->src_node = addr->sat_addr.s_node= ap->s_node; | |
1153 | } else { | |
1154 | if (!atalk_find_interface(addr->sat_addr.s_net, | |
1155 | addr->sat_addr.s_node)) | |
1156 | return -EADDRNOTAVAIL; | |
1157 | ||
1158 | at->src_net = addr->sat_addr.s_net; | |
1159 | at->src_node = addr->sat_addr.s_node; | |
1160 | } | |
1161 | ||
1162 | if (addr->sat_port == ATADDR_ANYPORT) { | |
1163 | int n = atalk_pick_and_bind_port(sk, addr); | |
1164 | ||
1165 | if (n < 0) | |
1166 | return n; | |
1167 | } else { | |
1168 | at->src_port = addr->sat_port; | |
1169 | ||
1170 | if (atalk_find_or_insert_socket(sk, addr)) | |
1171 | return -EADDRINUSE; | |
1172 | } | |
1173 | ||
1174 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | /* Set the address we talk to */ | |
1179 | static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, | |
1180 | int addr_len, int flags) | |
1181 | { | |
1182 | struct sock *sk = sock->sk; | |
1183 | struct atalk_sock *at = at_sk(sk); | |
1184 | struct sockaddr_at *addr; | |
1185 | ||
1186 | sk->sk_state = TCP_CLOSE; | |
1187 | sock->state = SS_UNCONNECTED; | |
1188 | ||
1189 | if (addr_len != sizeof(*addr)) | |
1190 | return -EINVAL; | |
1191 | ||
1192 | addr = (struct sockaddr_at *)uaddr; | |
1193 | ||
1194 | if (addr->sat_family != AF_APPLETALK) | |
1195 | return -EAFNOSUPPORT; | |
1196 | ||
1197 | if (addr->sat_addr.s_node == ATADDR_BCAST && | |
1198 | !sock_flag(sk, SOCK_BROADCAST)) { | |
ed4477b9 | 1199 | #if 1 |
1da177e4 LT |
1200 | printk(KERN_WARNING "%s is broken and did not set " |
1201 | "SO_BROADCAST. It will break when 2.2 is " | |
1202 | "released.\n", | |
1203 | current->comm); | |
1204 | #else | |
1205 | return -EACCES; | |
ed4477b9 | 1206 | #endif |
1da177e4 LT |
1207 | } |
1208 | ||
1209 | if (sock_flag(sk, SOCK_ZAPPED)) | |
1210 | if (atalk_autobind(sk) < 0) | |
1211 | return -EBUSY; | |
1212 | ||
1213 | if (!atrtr_get_dev(&addr->sat_addr)) | |
1214 | return -ENETUNREACH; | |
1215 | ||
1216 | at->dest_port = addr->sat_port; | |
1217 | at->dest_net = addr->sat_addr.s_net; | |
1218 | at->dest_node = addr->sat_addr.s_node; | |
1219 | ||
1220 | sock->state = SS_CONNECTED; | |
1221 | sk->sk_state = TCP_ESTABLISHED; | |
1222 | return 0; | |
1223 | } | |
1224 | ||
1225 | /* | |
1226 | * Find the name of an AppleTalk socket. Just copy the right | |
1227 | * fields into the sockaddr. | |
1228 | */ | |
1229 | static int atalk_getname(struct socket *sock, struct sockaddr *uaddr, | |
1230 | int *uaddr_len, int peer) | |
1231 | { | |
1232 | struct sockaddr_at sat; | |
1233 | struct sock *sk = sock->sk; | |
1234 | struct atalk_sock *at = at_sk(sk); | |
1235 | ||
1236 | if (sock_flag(sk, SOCK_ZAPPED)) | |
1237 | if (atalk_autobind(sk) < 0) | |
1238 | return -ENOBUFS; | |
1239 | ||
1240 | *uaddr_len = sizeof(struct sockaddr_at); | |
3d392475 | 1241 | memset(&sat.sat_zero, 0, sizeof(sat.sat_zero)); |
1da177e4 LT |
1242 | |
1243 | if (peer) { | |
1244 | if (sk->sk_state != TCP_ESTABLISHED) | |
1245 | return -ENOTCONN; | |
1246 | ||
1247 | sat.sat_addr.s_net = at->dest_net; | |
1248 | sat.sat_addr.s_node = at->dest_node; | |
1249 | sat.sat_port = at->dest_port; | |
1250 | } else { | |
1251 | sat.sat_addr.s_net = at->src_net; | |
1252 | sat.sat_addr.s_node = at->src_node; | |
1253 | sat.sat_port = at->src_port; | |
1254 | } | |
1255 | ||
1256 | sat.sat_family = AF_APPLETALK; | |
1257 | memcpy(uaddr, &sat, sizeof(sat)); | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE) | |
1262 | static __inline__ int is_ip_over_ddp(struct sk_buff *skb) | |
1263 | { | |
ed4477b9 | 1264 | return skb->data[12] == 22; |
1da177e4 LT |
1265 | } |
1266 | ||
1267 | static int handle_ip_over_ddp(struct sk_buff *skb) | |
1268 | { | |
881d966b | 1269 | struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0"); |
1da177e4 LT |
1270 | struct net_device_stats *stats; |
1271 | ||
1272 | /* This needs to be able to handle ipddp"N" devices */ | |
ffcfb8db ACM |
1273 | if (!dev) { |
1274 | kfree_skb(skb); | |
1275 | return NET_RX_DROP; | |
1276 | } | |
1da177e4 | 1277 | |
ed4477b9 YH |
1278 | skb->protocol = htons(ETH_P_IP); |
1279 | skb_pull(skb, 13); | |
1280 | skb->dev = dev; | |
badff6d0 | 1281 | skb_reset_transport_header(skb); |
1da177e4 | 1282 | |
524ad0a7 | 1283 | stats = netdev_priv(dev); |
ed4477b9 YH |
1284 | stats->rx_packets++; |
1285 | stats->rx_bytes += skb->len + 13; | |
ffcfb8db | 1286 | return netif_rx(skb); /* Send the SKB up to a higher place. */ |
1da177e4 LT |
1287 | } |
1288 | #else | |
1289 | /* make it easy for gcc to optimize this test out, i.e. kill the code */ | |
1290 | #define is_ip_over_ddp(skb) 0 | |
1291 | #define handle_ip_over_ddp(skb) 0 | |
1292 | #endif | |
1293 | ||
ffcfb8db ACM |
1294 | static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev, |
1295 | struct ddpehdr *ddp, __u16 len_hops, int origlen) | |
1da177e4 LT |
1296 | { |
1297 | struct atalk_route *rt; | |
1298 | struct atalk_addr ta; | |
1299 | ||
1300 | /* | |
1301 | * Don't route multicast, etc., packets, or packets sent to "this | |
ed4477b9 | 1302 | * network" |
1da177e4 LT |
1303 | */ |
1304 | if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { | |
1305 | /* | |
1306 | * FIXME: | |
1307 | * | |
1308 | * Can it ever happen that a packet is from a PPP iface and | |
1309 | * needs to be broadcast onto the default network? | |
1310 | */ | |
1311 | if (dev->type == ARPHRD_PPP) | |
1312 | printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " | |
1313 | "packet received from PPP iface\n"); | |
1314 | goto free_it; | |
1315 | } | |
1316 | ||
1317 | ta.s_net = ddp->deh_dnet; | |
1318 | ta.s_node = ddp->deh_dnode; | |
1319 | ||
1320 | /* Route the packet */ | |
1321 | rt = atrtr_find(&ta); | |
2a50f28c AV |
1322 | /* increment hops count */ |
1323 | len_hops += 1 << 10; | |
1324 | if (!rt || !(len_hops & (15 << 10))) | |
1da177e4 | 1325 | goto free_it; |
2a50f28c | 1326 | |
1da177e4 | 1327 | /* FIXME: use skb->cb to be able to use shared skbs */ |
1da177e4 LT |
1328 | |
1329 | /* | |
1330 | * Route goes through another gateway, so set the target to the | |
1331 | * gateway instead. | |
1332 | */ | |
1333 | ||
1334 | if (rt->flags & RTF_GATEWAY) { | |
1335 | ta.s_net = rt->gateway.s_net; | |
1336 | ta.s_node = rt->gateway.s_node; | |
1337 | } | |
1338 | ||
ed4477b9 YH |
1339 | /* Fix up skb->len field */ |
1340 | skb_trim(skb, min_t(unsigned int, origlen, | |
1da177e4 | 1341 | (rt->dev->hard_header_len + |
2a50f28c | 1342 | ddp_dl->header_length + (len_hops & 1023)))); |
1da177e4 | 1343 | |
1da177e4 | 1344 | /* FIXME: use skb->cb to be able to use shared skbs */ |
2a50f28c | 1345 | ddp->deh_len_hops = htons(len_hops); |
1da177e4 LT |
1346 | |
1347 | /* | |
1348 | * Send the buffer onwards | |
1349 | * | |
1350 | * Now we must always be careful. If it's come from LocalTalk to | |
1351 | * EtherTalk it might not fit | |
1352 | * | |
1353 | * Order matters here: If a packet has to be copied to make a new | |
1354 | * headroom (rare hopefully) then it won't need unsharing. | |
1355 | * | |
1356 | * Note. ddp-> becomes invalid at the realloc. | |
1357 | */ | |
1358 | if (skb_headroom(skb) < 22) { | |
1359 | /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ | |
1360 | struct sk_buff *nskb = skb_realloc_headroom(skb, 32); | |
1361 | kfree_skb(skb); | |
1da177e4 LT |
1362 | skb = nskb; |
1363 | } else | |
1364 | skb = skb_unshare(skb, GFP_ATOMIC); | |
ed4477b9 | 1365 | |
1da177e4 LT |
1366 | /* |
1367 | * If the buffer didn't vanish into the lack of space bitbucket we can | |
1368 | * send it. | |
1369 | */ | |
ffcfb8db ACM |
1370 | if (skb == NULL) |
1371 | goto drop; | |
1372 | ||
1373 | if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP) | |
1374 | return NET_RX_DROP; | |
8be8057e | 1375 | return NET_RX_SUCCESS; |
1da177e4 LT |
1376 | free_it: |
1377 | kfree_skb(skb); | |
ffcfb8db ACM |
1378 | drop: |
1379 | return NET_RX_DROP; | |
1da177e4 LT |
1380 | } |
1381 | ||
1382 | /** | |
1383 | * atalk_rcv - Receive a packet (in skb) from device dev | |
1384 | * @skb - packet received | |
1385 | * @dev - network device where the packet comes from | |
1386 | * @pt - packet type | |
1387 | * | |
1388 | * Receive a packet (in skb) from device dev. This has come from the SNAP | |
b0e380b1 ACM |
1389 | * decoder, and on entry skb->transport_header is the DDP header, skb->len |
1390 | * is the DDP header, skb->len is the DDP length. The physical headers | |
1391 | * have been extracted. PPP should probably pass frames marked as for this | |
1392 | * layer. [ie ARPHRD_ETHERTALK] | |
1da177e4 LT |
1393 | */ |
1394 | static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1395 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
1396 | { |
1397 | struct ddpehdr *ddp; | |
1398 | struct sock *sock; | |
1399 | struct atalk_iface *atif; | |
1400 | struct sockaddr_at tosat; | |
ed4477b9 | 1401 | int origlen; |
2a50f28c | 1402 | __u16 len_hops; |
1da177e4 | 1403 | |
721499e8 | 1404 | if (!net_eq(dev_net(dev), &init_net)) |
6885ffb3 | 1405 | goto drop; |
e730c155 | 1406 | |
1da177e4 | 1407 | /* Don't mangle buffer if shared */ |
ed4477b9 | 1408 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 | 1409 | goto out; |
ed4477b9 | 1410 | |
1da177e4 LT |
1411 | /* Size check and make sure header is contiguous */ |
1412 | if (!pskb_may_pull(skb, sizeof(*ddp))) | |
6885ffb3 | 1413 | goto drop; |
1da177e4 LT |
1414 | |
1415 | ddp = ddp_hdr(skb); | |
1416 | ||
2a50f28c | 1417 | len_hops = ntohs(ddp->deh_len_hops); |
1da177e4 LT |
1418 | |
1419 | /* Trim buffer in case of stray trailing data */ | |
1420 | origlen = skb->len; | |
2a50f28c | 1421 | skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); |
1da177e4 LT |
1422 | |
1423 | /* | |
1424 | * Size check to see if ddp->deh_len was crap | |
1425 | * (Otherwise we'll detonate most spectacularly | |
75559c16 | 1426 | * in the middle of atalk_checksum() or recvmsg()). |
1da177e4 | 1427 | */ |
75559c16 JD |
1428 | if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { |
1429 | pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " | |
1430 | "skb->len=%u)\n", len_hops & 1023, skb->len); | |
6885ffb3 | 1431 | goto drop; |
75559c16 | 1432 | } |
1da177e4 LT |
1433 | |
1434 | /* | |
1435 | * Any checksums. Note we don't do htons() on this == is assumed to be | |
1436 | * valid for net byte orders all over the networking code... | |
1437 | */ | |
1438 | if (ddp->deh_sum && | |
2a50f28c | 1439 | atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum) |
1da177e4 | 1440 | /* Not a valid AppleTalk frame - dustbin time */ |
6885ffb3 | 1441 | goto drop; |
1da177e4 LT |
1442 | |
1443 | /* Check the packet is aimed at us */ | |
1444 | if (!ddp->deh_dnet) /* Net 0 is 'this network' */ | |
1445 | atif = atalk_find_anynet(ddp->deh_dnode, dev); | |
1446 | else | |
1447 | atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); | |
1448 | ||
1da177e4 | 1449 | if (!atif) { |
64233bff OD |
1450 | /* Not ours, so we route the packet via the correct |
1451 | * AppleTalk iface | |
1452 | */ | |
ffcfb8db | 1453 | return atalk_route_packet(skb, dev, ddp, len_hops, origlen); |
1da177e4 LT |
1454 | } |
1455 | ||
1456 | /* if IP over DDP is not selected this code will be optimized out */ | |
1457 | if (is_ip_over_ddp(skb)) | |
1458 | return handle_ip_over_ddp(skb); | |
1459 | /* | |
1460 | * Which socket - atalk_search_socket() looks for a *full match* | |
1461 | * of the <net, node, port> tuple. | |
1462 | */ | |
1463 | tosat.sat_addr.s_net = ddp->deh_dnet; | |
1464 | tosat.sat_addr.s_node = ddp->deh_dnode; | |
1465 | tosat.sat_port = ddp->deh_dport; | |
1466 | ||
1467 | sock = atalk_search_socket(&tosat, atif); | |
1468 | if (!sock) /* But not one of our sockets */ | |
6885ffb3 | 1469 | goto drop; |
1da177e4 LT |
1470 | |
1471 | /* Queue packet (standard) */ | |
1472 | skb->sk = sock; | |
1473 | ||
1474 | if (sock_queue_rcv_skb(sock, skb) < 0) | |
6885ffb3 MS |
1475 | goto drop; |
1476 | ||
1477 | return NET_RX_SUCCESS; | |
1478 | ||
1479 | drop: | |
1da177e4 | 1480 | kfree_skb(skb); |
6885ffb3 MS |
1481 | out: |
1482 | return NET_RX_DROP; | |
1483 | ||
1da177e4 LT |
1484 | } |
1485 | ||
1486 | /* | |
1487 | * Receive a LocalTalk frame. We make some demands on the caller here. | |
1488 | * Caller must provide enough headroom on the packet to pull the short | |
1489 | * header and append a long one. | |
1490 | */ | |
1491 | static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1492 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 | 1493 | { |
721499e8 | 1494 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
1495 | goto freeit; |
1496 | ||
1da177e4 | 1497 | /* Expand any short form frames */ |
98e399f8 | 1498 | if (skb_mac_header(skb)[2] == 1) { |
1da177e4 LT |
1499 | struct ddpehdr *ddp; |
1500 | /* Find our address */ | |
1501 | struct atalk_addr *ap = atalk_find_dev_addr(dev); | |
1502 | ||
2a50f28c | 1503 | if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) |
1da177e4 LT |
1504 | goto freeit; |
1505 | ||
1506 | /* Don't mangle buffer if shared */ | |
ed4477b9 | 1507 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 LT |
1508 | return 0; |
1509 | ||
1510 | /* | |
1511 | * The push leaves us with a ddephdr not an shdr, and | |
1512 | * handily the port bytes in the right place preset. | |
1513 | */ | |
1514 | ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4); | |
1515 | ||
1516 | /* Now fill in the long header */ | |
1517 | ||
ed4477b9 YH |
1518 | /* |
1519 | * These two first. The mac overlays the new source/dest | |
1520 | * network information so we MUST copy these before | |
1521 | * we write the network numbers ! | |
1522 | */ | |
1da177e4 | 1523 | |
98e399f8 ACM |
1524 | ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */ |
1525 | ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */ | |
1da177e4 LT |
1526 | |
1527 | ddp->deh_dnet = ap->s_net; /* Network number */ | |
1528 | ddp->deh_snet = ap->s_net; | |
1529 | ddp->deh_sum = 0; /* No checksum */ | |
1530 | /* | |
1531 | * Not sure about this bit... | |
1532 | */ | |
2a50f28c AV |
1533 | /* Non routable, so force a drop if we slip up later */ |
1534 | ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); | |
1da177e4 | 1535 | } |
badff6d0 | 1536 | skb_reset_transport_header(skb); |
1da177e4 | 1537 | |
f2ccd8fa | 1538 | return atalk_rcv(skb, dev, pt, orig_dev); |
1da177e4 LT |
1539 | freeit: |
1540 | kfree_skb(skb); | |
1541 | return 0; | |
1542 | } | |
1543 | ||
1544 | static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | |
1545 | size_t len) | |
1546 | { | |
1547 | struct sock *sk = sock->sk; | |
1548 | struct atalk_sock *at = at_sk(sk); | |
1549 | struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name; | |
1550 | int flags = msg->msg_flags; | |
1551 | int loopback = 0; | |
1552 | struct sockaddr_at local_satalk, gsat; | |
1553 | struct sk_buff *skb; | |
1554 | struct net_device *dev; | |
1555 | struct ddpehdr *ddp; | |
1556 | int size; | |
1557 | struct atalk_route *rt; | |
1558 | int err; | |
1559 | ||
1560 | if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) | |
1561 | return -EINVAL; | |
1562 | ||
1563 | if (len > DDP_MAXSZ) | |
1564 | return -EMSGSIZE; | |
1565 | ||
1566 | if (usat) { | |
1567 | if (sock_flag(sk, SOCK_ZAPPED)) | |
1568 | if (atalk_autobind(sk) < 0) | |
1569 | return -EBUSY; | |
1570 | ||
1571 | if (msg->msg_namelen < sizeof(*usat) || | |
1572 | usat->sat_family != AF_APPLETALK) | |
1573 | return -EINVAL; | |
1574 | ||
03ba9991 | 1575 | /* netatalk didn't implement this check */ |
1da177e4 LT |
1576 | if (usat->sat_addr.s_node == ATADDR_BCAST && |
1577 | !sock_flag(sk, SOCK_BROADCAST)) { | |
1da177e4 | 1578 | return -EPERM; |
1da177e4 LT |
1579 | } |
1580 | } else { | |
1581 | if (sk->sk_state != TCP_ESTABLISHED) | |
1582 | return -ENOTCONN; | |
1583 | usat = &local_satalk; | |
1584 | usat->sat_family = AF_APPLETALK; | |
1585 | usat->sat_port = at->dest_port; | |
1586 | usat->sat_addr.s_node = at->dest_node; | |
1587 | usat->sat_addr.s_net = at->dest_net; | |
1588 | } | |
1589 | ||
1590 | /* Build a packet */ | |
1591 | SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); | |
1592 | ||
1593 | /* For headers */ | |
1594 | size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; | |
1595 | ||
1596 | if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { | |
1597 | rt = atrtr_find(&usat->sat_addr); | |
1da177e4 LT |
1598 | } else { |
1599 | struct atalk_addr at_hint; | |
1600 | ||
1601 | at_hint.s_node = 0; | |
1602 | at_hint.s_net = at->src_net; | |
1603 | ||
1604 | rt = atrtr_find(&at_hint); | |
1da177e4 | 1605 | } |
64233bff OD |
1606 | if (!rt) |
1607 | return -ENETUNREACH; | |
1608 | ||
1609 | dev = rt->dev; | |
1da177e4 LT |
1610 | |
1611 | SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", | |
1612 | sk, size, dev->name); | |
1613 | ||
1614 | size += dev->hard_header_len; | |
1615 | skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); | |
1616 | if (!skb) | |
1617 | return err; | |
ed4477b9 | 1618 | |
1da177e4 LT |
1619 | skb->sk = sk; |
1620 | skb_reserve(skb, ddp_dl->header_length); | |
1621 | skb_reserve(skb, dev->hard_header_len); | |
1622 | skb->dev = dev; | |
1623 | ||
1624 | SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); | |
1625 | ||
1626 | ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr)); | |
2a50f28c | 1627 | ddp->deh_len_hops = htons(len + sizeof(*ddp)); |
1da177e4 LT |
1628 | ddp->deh_dnet = usat->sat_addr.s_net; |
1629 | ddp->deh_snet = at->src_net; | |
1630 | ddp->deh_dnode = usat->sat_addr.s_node; | |
1631 | ddp->deh_snode = at->src_node; | |
1632 | ddp->deh_dport = usat->sat_port; | |
1633 | ddp->deh_sport = at->src_port; | |
1634 | ||
1635 | SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len); | |
1636 | ||
1637 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
1638 | if (err) { | |
1639 | kfree_skb(skb); | |
1640 | return -EFAULT; | |
1641 | } | |
1642 | ||
1643 | if (sk->sk_no_check == 1) | |
1644 | ddp->deh_sum = 0; | |
1645 | else | |
1646 | ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); | |
1647 | ||
1648 | /* | |
1649 | * Loopback broadcast packets to non gateway targets (ie routes | |
1650 | * to group we are in) | |
1651 | */ | |
1652 | if (ddp->deh_dnode == ATADDR_BCAST && | |
1653 | !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { | |
1654 | struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); | |
1655 | ||
1656 | if (skb2) { | |
1657 | loopback = 1; | |
1658 | SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); | |
ffcfb8db ACM |
1659 | /* |
1660 | * If it fails it is queued/sent above in the aarp queue | |
1661 | */ | |
1662 | aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL); | |
1da177e4 LT |
1663 | } |
1664 | } | |
1665 | ||
1666 | if (dev->flags & IFF_LOOPBACK || loopback) { | |
1667 | SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); | |
1668 | /* loop back */ | |
1669 | skb_orphan(skb); | |
64233bff OD |
1670 | if (ddp->deh_dnode == ATADDR_BCAST) { |
1671 | struct atalk_addr at_lo; | |
1672 | ||
1673 | at_lo.s_node = 0; | |
1674 | at_lo.s_net = 0; | |
1675 | ||
1676 | rt = atrtr_find(&at_lo); | |
1677 | if (!rt) { | |
1678 | kfree_skb(skb); | |
1679 | return -ENETUNREACH; | |
1680 | } | |
1681 | dev = rt->dev; | |
1682 | skb->dev = dev; | |
1683 | } | |
1da177e4 LT |
1684 | ddp_dl->request(ddp_dl, skb, dev->dev_addr); |
1685 | } else { | |
1686 | SOCK_DEBUG(sk, "SK %p: send out.\n", sk); | |
1687 | if (rt->flags & RTF_GATEWAY) { | |
1688 | gsat.sat_addr = rt->gateway; | |
1689 | usat = &gsat; | |
1690 | } | |
1691 | ||
ffcfb8db ACM |
1692 | /* |
1693 | * If it fails it is queued/sent above in the aarp queue | |
1694 | */ | |
1695 | aarp_send_ddp(dev, skb, &usat->sat_addr, NULL); | |
1da177e4 LT |
1696 | } |
1697 | SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len); | |
1698 | ||
1699 | return len; | |
1700 | } | |
1701 | ||
1702 | static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | |
1703 | size_t size, int flags) | |
1704 | { | |
1705 | struct sock *sk = sock->sk; | |
1706 | struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name; | |
1707 | struct ddpehdr *ddp; | |
1708 | int copied = 0; | |
2a50f28c | 1709 | int offset = 0; |
1da177e4 | 1710 | int err = 0; |
1da177e4 LT |
1711 | struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
1712 | flags & MSG_DONTWAIT, &err); | |
1713 | if (!skb) | |
1714 | return err; | |
1715 | ||
1716 | /* FIXME: use skb->cb to be able to use shared skbs */ | |
1717 | ddp = ddp_hdr(skb); | |
2a50f28c | 1718 | copied = ntohs(ddp->deh_len_hops) & 1023; |
1da177e4 | 1719 | |
2a50f28c AV |
1720 | if (sk->sk_type != SOCK_RAW) { |
1721 | offset = sizeof(*ddp); | |
1722 | copied -= offset; | |
1723 | } | |
1da177e4 | 1724 | |
2a50f28c AV |
1725 | if (copied > size) { |
1726 | copied = size; | |
1727 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 | 1728 | } |
2a50f28c | 1729 | err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied); |
1da177e4 LT |
1730 | |
1731 | if (!err) { | |
1732 | if (sat) { | |
1733 | sat->sat_family = AF_APPLETALK; | |
1734 | sat->sat_port = ddp->deh_sport; | |
1735 | sat->sat_addr.s_node = ddp->deh_snode; | |
1736 | sat->sat_addr.s_net = ddp->deh_snet; | |
1737 | } | |
1738 | msg->msg_namelen = sizeof(*sat); | |
1739 | } | |
1740 | ||
1741 | skb_free_datagram(sk, skb); /* Free the datagram. */ | |
1742 | return err ? : copied; | |
1743 | } | |
1744 | ||
1745 | ||
1746 | /* | |
1747 | * AppleTalk ioctl calls. | |
1748 | */ | |
1749 | static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1750 | { | |
b5e5fa5e | 1751 | int rc = -ENOIOCTLCMD; |
1da177e4 LT |
1752 | struct sock *sk = sock->sk; |
1753 | void __user *argp = (void __user *)arg; | |
1754 | ||
1755 | switch (cmd) { | |
1756 | /* Protocol layer */ | |
1757 | case TIOCOUTQ: { | |
31e6d363 | 1758 | long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); |
1da177e4 LT |
1759 | |
1760 | if (amount < 0) | |
1761 | amount = 0; | |
1762 | rc = put_user(amount, (int __user *)argp); | |
1763 | break; | |
1764 | } | |
1765 | case TIOCINQ: { | |
1766 | /* | |
1767 | * These two are safe on a single CPU system as only | |
1768 | * user tasks fiddle here | |
1769 | */ | |
1770 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); | |
1771 | long amount = 0; | |
1772 | ||
1773 | if (skb) | |
1774 | amount = skb->len - sizeof(struct ddpehdr); | |
1775 | rc = put_user(amount, (int __user *)argp); | |
1776 | break; | |
1777 | } | |
1778 | case SIOCGSTAMP: | |
1779 | rc = sock_get_timestamp(sk, argp); | |
1780 | break; | |
ae40eb1e ED |
1781 | case SIOCGSTAMPNS: |
1782 | rc = sock_get_timestampns(sk, argp); | |
1783 | break; | |
1da177e4 LT |
1784 | /* Routing */ |
1785 | case SIOCADDRT: | |
1786 | case SIOCDELRT: | |
1787 | rc = -EPERM; | |
1788 | if (capable(CAP_NET_ADMIN)) | |
1789 | rc = atrtr_ioctl(cmd, argp); | |
1790 | break; | |
1791 | /* Interface */ | |
1792 | case SIOCGIFADDR: | |
1793 | case SIOCSIFADDR: | |
1794 | case SIOCGIFBRDADDR: | |
1795 | case SIOCATALKDIFADDR: | |
1796 | case SIOCDIFADDR: | |
1797 | case SIOCSARP: /* proxy AARP */ | |
1798 | case SIOCDARP: /* proxy AARP */ | |
1799 | rtnl_lock(); | |
1800 | rc = atif_ioctl(cmd, argp); | |
1801 | rtnl_unlock(); | |
1802 | break; | |
1da177e4 LT |
1803 | } |
1804 | ||
1805 | return rc; | |
1806 | } | |
1807 | ||
f6c90b71 PV |
1808 | |
1809 | #ifdef CONFIG_COMPAT | |
1810 | static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1811 | { | |
1812 | /* | |
1813 | * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And | |
1814 | * SIOCATALKDIFADDR is handled by upper layer as well, so there is | |
1815 | * nothing to do. Eventually SIOCATALKDIFADDR should be moved | |
1816 | * here so there is no generic SIOCPROTOPRIVATE translation in the | |
1817 | * system. | |
1818 | */ | |
1819 | return -ENOIOCTLCMD; | |
1820 | } | |
1821 | #endif | |
1822 | ||
1823 | ||
ec1b4cf7 | 1824 | static const struct net_proto_family atalk_family_ops = { |
1da177e4 LT |
1825 | .family = PF_APPLETALK, |
1826 | .create = atalk_create, | |
1827 | .owner = THIS_MODULE, | |
1828 | }; | |
1829 | ||
90ddc4f0 | 1830 | static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = { |
1da177e4 LT |
1831 | .family = PF_APPLETALK, |
1832 | .owner = THIS_MODULE, | |
1833 | .release = atalk_release, | |
1834 | .bind = atalk_bind, | |
1835 | .connect = atalk_connect, | |
1836 | .socketpair = sock_no_socketpair, | |
1837 | .accept = sock_no_accept, | |
1838 | .getname = atalk_getname, | |
1839 | .poll = datagram_poll, | |
1840 | .ioctl = atalk_ioctl, | |
f6c90b71 PV |
1841 | #ifdef CONFIG_COMPAT |
1842 | .compat_ioctl = atalk_compat_ioctl, | |
1843 | #endif | |
1da177e4 LT |
1844 | .listen = sock_no_listen, |
1845 | .shutdown = sock_no_shutdown, | |
1846 | .setsockopt = sock_no_setsockopt, | |
1847 | .getsockopt = sock_no_getsockopt, | |
1848 | .sendmsg = atalk_sendmsg, | |
1849 | .recvmsg = atalk_recvmsg, | |
1850 | .mmap = sock_no_mmap, | |
1851 | .sendpage = sock_no_sendpage, | |
1852 | }; | |
1853 | ||
1da177e4 LT |
1854 | SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK); |
1855 | ||
1856 | static struct notifier_block ddp_notifier = { | |
1857 | .notifier_call = ddp_device_event, | |
1858 | }; | |
1859 | ||
7546dd97 | 1860 | static struct packet_type ltalk_packet_type __read_mostly = { |
09640e63 | 1861 | .type = cpu_to_be16(ETH_P_LOCALTALK), |
1da177e4 LT |
1862 | .func = ltalk_rcv, |
1863 | }; | |
1864 | ||
7546dd97 | 1865 | static struct packet_type ppptalk_packet_type __read_mostly = { |
09640e63 | 1866 | .type = cpu_to_be16(ETH_P_PPPTALK), |
1da177e4 LT |
1867 | .func = atalk_rcv, |
1868 | }; | |
1869 | ||
1870 | static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; | |
1871 | ||
1872 | /* Export symbols for use by drivers when AppleTalk is a module */ | |
1da177e4 LT |
1873 | EXPORT_SYMBOL(atrtr_get_dev); |
1874 | EXPORT_SYMBOL(atalk_find_dev_addr); | |
1875 | ||
2db09608 | 1876 | static const char atalk_err_snap[] __initconst = |
1da177e4 LT |
1877 | KERN_CRIT "Unable to register DDP with SNAP.\n"; |
1878 | ||
1879 | /* Called by proto.c on kernel start up */ | |
1880 | static int __init atalk_init(void) | |
1881 | { | |
1882 | int rc = proto_register(&ddp_proto, 0); | |
1883 | ||
1884 | if (rc != 0) | |
1885 | goto out; | |
1886 | ||
1887 | (void)sock_register(&atalk_family_ops); | |
1888 | ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); | |
1889 | if (!ddp_dl) | |
1890 | printk(atalk_err_snap); | |
1891 | ||
1892 | dev_add_pack(<alk_packet_type); | |
1893 | dev_add_pack(&ppptalk_packet_type); | |
1894 | ||
1895 | register_netdevice_notifier(&ddp_notifier); | |
1896 | aarp_proto_init(); | |
1897 | atalk_proc_init(); | |
1898 | atalk_register_sysctl(); | |
1899 | out: | |
1900 | return rc; | |
1901 | } | |
1902 | module_init(atalk_init); | |
1903 | ||
1904 | /* | |
1905 | * No explicit module reference count manipulation is needed in the | |
1906 | * protocol. Socket layer sets module reference count for us | |
1907 | * and interfaces reference counting is done | |
1908 | * by the network device layer. | |
1909 | * | |
1910 | * Ergo, before the AppleTalk module can be removed, all AppleTalk | |
1911 | * sockets be closed from user space. | |
1912 | */ | |
1913 | static void __exit atalk_exit(void) | |
1914 | { | |
1915 | #ifdef CONFIG_SYSCTL | |
1916 | atalk_unregister_sysctl(); | |
1917 | #endif /* CONFIG_SYSCTL */ | |
1918 | atalk_proc_exit(); | |
1919 | aarp_cleanup_module(); /* General aarp clean-up. */ | |
1920 | unregister_netdevice_notifier(&ddp_notifier); | |
1921 | dev_remove_pack(<alk_packet_type); | |
1922 | dev_remove_pack(&ppptalk_packet_type); | |
1923 | unregister_snap_client(ddp_dl); | |
1924 | sock_unregister(PF_APPLETALK); | |
1925 | proto_unregister(&ddp_proto); | |
1926 | } | |
1927 | module_exit(atalk_exit); | |
1928 | ||
1929 | MODULE_LICENSE("GPL"); | |
113aa838 | 1930 | MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>"); |
1da177e4 LT |
1931 | MODULE_DESCRIPTION("AppleTalk 0.20\n"); |
1932 | MODULE_ALIAS_NETPROTO(PF_APPLETALK); |