]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * DDP: An implementation of the AppleTalk DDP protocol for | |
3 | * Ethernet 'ELAP'. | |
4 | * | |
113aa838 | 5 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
6 | * |
7 | * With more than a little assistance from | |
8 | * | |
9 | * Wesley Craig <netatalk@umich.edu> | |
10 | * | |
11 | * Fixes: | |
12 | * Neil Horman : Added missing device ioctls | |
13 | * Michael Callahan : Made routing work | |
14 | * Wesley Craig : Fix probing to listen to a | |
15 | * passed node id. | |
16 | * Alan Cox : Added send/recvmsg support | |
17 | * Alan Cox : Moved at. to protinfo in | |
18 | * socket. | |
19 | * Alan Cox : Added firewall hooks. | |
20 | * Alan Cox : Supports new ARPHRD_LOOPBACK | |
21 | * Christer Weinigel : Routing and /proc fixes. | |
22 | * Bradford Johnson : LocalTalk. | |
23 | * Tom Dyas : Module support. | |
24 | * Alan Cox : Hooks for PPP (based on the | |
25 | * LocalTalk hook). | |
26 | * Alan Cox : Posix bits | |
27 | * Alan Cox/Mike Freeman : Possible fix to NBP problems | |
28 | * Bradford Johnson : IP-over-DDP (experimental) | |
29 | * Jay Schulist : Moved IP-over-DDP to its own | |
30 | * driver file. (ipddp.c & ipddp.h) | |
ed4477b9 | 31 | * Jay Schulist : Made work as module with |
1da177e4 LT |
32 | * AppleTalk drivers, cleaned it. |
33 | * Rob Newberry : Added proxy AARP and AARP | |
34 | * procfs, moved probing to AARP | |
35 | * module. | |
ed4477b9 YH |
36 | * Adrian Sun/ |
37 | * Michael Zuelsdorff : fix for net.0 packets. don't | |
1da177e4 | 38 | * allow illegal ether/tokentalk |
ed4477b9 YH |
39 | * port assignment. we lose a |
40 | * valid localtalk port as a | |
1da177e4 LT |
41 | * result. |
42 | * Arnaldo C. de Melo : Cleanup, in preparation for | |
43 | * shared skb support 8) | |
44 | * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c, | |
45 | * use seq_file | |
46 | * | |
47 | * This program is free software; you can redistribute it and/or | |
48 | * modify it under the terms of the GNU General Public License | |
49 | * as published by the Free Software Foundation; either version | |
50 | * 2 of the License, or (at your option) any later version. | |
ed4477b9 | 51 | * |
1da177e4 LT |
52 | */ |
53 | ||
4fc268d2 | 54 | #include <linux/capability.h> |
1da177e4 | 55 | #include <linux/module.h> |
1da177e4 LT |
56 | #include <linux/if_arp.h> |
57 | #include <linux/termios.h> /* For TIOCOUTQ/INQ */ | |
415ce61a | 58 | #include <linux/compat.h> |
5a0e3ad6 | 59 | #include <linux/slab.h> |
1da177e4 LT |
60 | #include <net/datalink.h> |
61 | #include <net/psnap.h> | |
62 | #include <net/sock.h> | |
c752f073 | 63 | #include <net/tcp_states.h> |
1da177e4 LT |
64 | #include <net/route.h> |
65 | #include <linux/atalk.h> | |
51c56b00 | 66 | #include <linux/highmem.h> |
1da177e4 LT |
67 | |
68 | struct datalink_proto *ddp_dl, *aarp_dl; | |
90ddc4f0 | 69 | static const struct proto_ops atalk_dgram_ops; |
1da177e4 LT |
70 | |
71 | /**************************************************************************\ | |
72 | * * | |
73 | * Handlers for the socket list. * | |
74 | * * | |
75 | \**************************************************************************/ | |
76 | ||
77 | HLIST_HEAD(atalk_sockets); | |
78 | DEFINE_RWLOCK(atalk_sockets_lock); | |
79 | ||
80 | static inline void __atalk_insert_socket(struct sock *sk) | |
81 | { | |
82 | sk_add_node(sk, &atalk_sockets); | |
83 | } | |
84 | ||
85 | static inline void atalk_remove_socket(struct sock *sk) | |
86 | { | |
87 | write_lock_bh(&atalk_sockets_lock); | |
88 | sk_del_node_init(sk); | |
89 | write_unlock_bh(&atalk_sockets_lock); | |
90 | } | |
91 | ||
92 | static struct sock *atalk_search_socket(struct sockaddr_at *to, | |
93 | struct atalk_iface *atif) | |
94 | { | |
95 | struct sock *s; | |
1da177e4 LT |
96 | |
97 | read_lock_bh(&atalk_sockets_lock); | |
b67bfe0d | 98 | sk_for_each(s, &atalk_sockets) { |
1da177e4 LT |
99 | struct atalk_sock *at = at_sk(s); |
100 | ||
101 | if (to->sat_port != at->src_port) | |
102 | continue; | |
103 | ||
ed4477b9 | 104 | if (to->sat_addr.s_net == ATADDR_ANYNET && |
64233bff | 105 | to->sat_addr.s_node == ATADDR_BCAST) |
1da177e4 LT |
106 | goto found; |
107 | ||
ed4477b9 | 108 | if (to->sat_addr.s_net == at->src_net && |
1da177e4 LT |
109 | (to->sat_addr.s_node == at->src_node || |
110 | to->sat_addr.s_node == ATADDR_BCAST || | |
111 | to->sat_addr.s_node == ATADDR_ANYNODE)) | |
112 | goto found; | |
113 | ||
ed4477b9 | 114 | /* XXXX.0 -- we got a request for this router. make sure |
1da177e4 LT |
115 | * that the node is appropriately set. */ |
116 | if (to->sat_addr.s_node == ATADDR_ANYNODE && | |
117 | to->sat_addr.s_net != ATADDR_ANYNET && | |
118 | atif->address.s_node == at->src_node) { | |
119 | to->sat_addr.s_node = atif->address.s_node; | |
120 | goto found; | |
121 | } | |
122 | } | |
123 | s = NULL; | |
124 | found: | |
125 | read_unlock_bh(&atalk_sockets_lock); | |
126 | return s; | |
127 | } | |
128 | ||
129 | /** | |
130 | * atalk_find_or_insert_socket - Try to find a socket matching ADDR | |
2c53040f BH |
131 | * @sk: socket to insert in the list if it is not there already |
132 | * @sat: address to search for | |
1da177e4 LT |
133 | * |
134 | * Try to find a socket matching ADDR in the socket list, if found then return | |
135 | * it. If not, insert SK into the socket list. | |
136 | * | |
137 | * This entire operation must execute atomically. | |
138 | */ | |
139 | static struct sock *atalk_find_or_insert_socket(struct sock *sk, | |
140 | struct sockaddr_at *sat) | |
141 | { | |
142 | struct sock *s; | |
1da177e4 LT |
143 | struct atalk_sock *at; |
144 | ||
145 | write_lock_bh(&atalk_sockets_lock); | |
b67bfe0d | 146 | sk_for_each(s, &atalk_sockets) { |
1da177e4 LT |
147 | at = at_sk(s); |
148 | ||
149 | if (at->src_net == sat->sat_addr.s_net && | |
150 | at->src_node == sat->sat_addr.s_node && | |
151 | at->src_port == sat->sat_port) | |
152 | goto found; | |
153 | } | |
154 | s = NULL; | |
155 | __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */ | |
156 | found: | |
157 | write_unlock_bh(&atalk_sockets_lock); | |
158 | return s; | |
159 | } | |
160 | ||
e99e88a9 | 161 | static void atalk_destroy_timer(struct timer_list *t) |
1da177e4 | 162 | { |
e99e88a9 | 163 | struct sock *sk = from_timer(sk, t, sk_timer); |
1da177e4 | 164 | |
c564039f | 165 | if (sk_has_allocations(sk)) { |
1da177e4 LT |
166 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
167 | add_timer(&sk->sk_timer); | |
168 | } else | |
169 | sock_put(sk); | |
170 | } | |
171 | ||
172 | static inline void atalk_destroy_socket(struct sock *sk) | |
173 | { | |
174 | atalk_remove_socket(sk); | |
175 | skb_queue_purge(&sk->sk_receive_queue); | |
176 | ||
c564039f | 177 | if (sk_has_allocations(sk)) { |
e99e88a9 | 178 | timer_setup(&sk->sk_timer, atalk_destroy_timer, 0); |
1da177e4 | 179 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
1da177e4 LT |
180 | add_timer(&sk->sk_timer); |
181 | } else | |
182 | sock_put(sk); | |
183 | } | |
184 | ||
185 | /**************************************************************************\ | |
186 | * * | |
187 | * Routing tables for the AppleTalk socket layer. * | |
188 | * * | |
189 | \**************************************************************************/ | |
190 | ||
191 | /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ | |
192 | struct atalk_route *atalk_routes; | |
193 | DEFINE_RWLOCK(atalk_routes_lock); | |
194 | ||
195 | struct atalk_iface *atalk_interfaces; | |
196 | DEFINE_RWLOCK(atalk_interfaces_lock); | |
197 | ||
198 | /* For probing devices or in a routerless network */ | |
199 | struct atalk_route atrtr_default; | |
200 | ||
201 | /* AppleTalk interface control */ | |
202 | /* | |
203 | * Drop a device. Doesn't drop any of its routes - that is the caller's | |
204 | * problem. Called when we down the interface or delete the address. | |
205 | */ | |
206 | static void atif_drop_device(struct net_device *dev) | |
207 | { | |
208 | struct atalk_iface **iface = &atalk_interfaces; | |
209 | struct atalk_iface *tmp; | |
210 | ||
211 | write_lock_bh(&atalk_interfaces_lock); | |
212 | while ((tmp = *iface) != NULL) { | |
213 | if (tmp->dev == dev) { | |
214 | *iface = tmp->next; | |
215 | dev_put(dev); | |
216 | kfree(tmp); | |
217 | dev->atalk_ptr = NULL; | |
218 | } else | |
219 | iface = &tmp->next; | |
220 | } | |
221 | write_unlock_bh(&atalk_interfaces_lock); | |
222 | } | |
223 | ||
224 | static struct atalk_iface *atif_add_device(struct net_device *dev, | |
225 | struct atalk_addr *sa) | |
226 | { | |
0da974f4 | 227 | struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); |
1da177e4 LT |
228 | |
229 | if (!iface) | |
230 | goto out; | |
231 | ||
1da177e4 LT |
232 | dev_hold(dev); |
233 | iface->dev = dev; | |
234 | dev->atalk_ptr = iface; | |
235 | iface->address = *sa; | |
236 | iface->status = 0; | |
237 | ||
238 | write_lock_bh(&atalk_interfaces_lock); | |
239 | iface->next = atalk_interfaces; | |
240 | atalk_interfaces = iface; | |
241 | write_unlock_bh(&atalk_interfaces_lock); | |
242 | out: | |
243 | return iface; | |
244 | } | |
245 | ||
246 | /* Perform phase 2 AARP probing on our tentative address */ | |
247 | static int atif_probe_device(struct atalk_iface *atif) | |
248 | { | |
249 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
250 | ntohs(atif->nets.nr_firstnet) + 1; | |
251 | int probe_net = ntohs(atif->address.s_net); | |
252 | int probe_node = atif->address.s_node; | |
253 | int netct, nodect; | |
254 | ||
255 | /* Offset the network we start probing with */ | |
256 | if (probe_net == ATADDR_ANYNET) { | |
257 | probe_net = ntohs(atif->nets.nr_firstnet); | |
258 | if (netrange) | |
259 | probe_net += jiffies % netrange; | |
260 | } | |
261 | if (probe_node == ATADDR_ANYNODE) | |
262 | probe_node = jiffies & 0xFF; | |
263 | ||
264 | /* Scan the networks */ | |
265 | atif->status |= ATIF_PROBE; | |
266 | for (netct = 0; netct <= netrange; netct++) { | |
267 | /* Sweep the available nodes from a given start */ | |
268 | atif->address.s_net = htons(probe_net); | |
269 | for (nodect = 0; nodect < 256; nodect++) { | |
270 | atif->address.s_node = (nodect + probe_node) & 0xFF; | |
271 | if (atif->address.s_node > 0 && | |
272 | atif->address.s_node < 254) { | |
273 | /* Probe a proposed address */ | |
274 | aarp_probe_network(atif); | |
275 | ||
276 | if (!(atif->status & ATIF_PROBE_FAIL)) { | |
277 | atif->status &= ~ATIF_PROBE; | |
278 | return 0; | |
279 | } | |
280 | } | |
281 | atif->status &= ~ATIF_PROBE_FAIL; | |
282 | } | |
283 | probe_net++; | |
284 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
285 | probe_net = ntohs(atif->nets.nr_firstnet); | |
286 | } | |
287 | atif->status &= ~ATIF_PROBE; | |
288 | ||
289 | return -EADDRINUSE; /* Network is full... */ | |
290 | } | |
291 | ||
292 | ||
293 | /* Perform AARP probing for a proxy address */ | |
294 | static int atif_proxy_probe_device(struct atalk_iface *atif, | |
6f0984a0 | 295 | struct atalk_addr *proxy_addr) |
1da177e4 LT |
296 | { |
297 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
298 | ntohs(atif->nets.nr_firstnet) + 1; | |
299 | /* we probe the interface's network */ | |
300 | int probe_net = ntohs(atif->address.s_net); | |
301 | int probe_node = ATADDR_ANYNODE; /* we'll take anything */ | |
302 | int netct, nodect; | |
303 | ||
304 | /* Offset the network we start probing with */ | |
305 | if (probe_net == ATADDR_ANYNET) { | |
306 | probe_net = ntohs(atif->nets.nr_firstnet); | |
307 | if (netrange) | |
308 | probe_net += jiffies % netrange; | |
309 | } | |
310 | ||
311 | if (probe_node == ATADDR_ANYNODE) | |
312 | probe_node = jiffies & 0xFF; | |
ed4477b9 | 313 | |
1da177e4 LT |
314 | /* Scan the networks */ |
315 | for (netct = 0; netct <= netrange; netct++) { | |
316 | /* Sweep the available nodes from a given start */ | |
317 | proxy_addr->s_net = htons(probe_net); | |
318 | for (nodect = 0; nodect < 256; nodect++) { | |
319 | proxy_addr->s_node = (nodect + probe_node) & 0xFF; | |
320 | if (proxy_addr->s_node > 0 && | |
321 | proxy_addr->s_node < 254) { | |
322 | /* Tell AARP to probe a proposed address */ | |
323 | int ret = aarp_proxy_probe_network(atif, | |
324 | proxy_addr); | |
325 | ||
326 | if (ret != -EADDRINUSE) | |
327 | return ret; | |
328 | } | |
329 | } | |
330 | probe_net++; | |
331 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
332 | probe_net = ntohs(atif->nets.nr_firstnet); | |
333 | } | |
334 | ||
335 | return -EADDRINUSE; /* Network is full... */ | |
336 | } | |
337 | ||
338 | ||
339 | struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) | |
340 | { | |
341 | struct atalk_iface *iface = dev->atalk_ptr; | |
342 | return iface ? &iface->address : NULL; | |
343 | } | |
344 | ||
345 | static struct atalk_addr *atalk_find_primary(void) | |
346 | { | |
347 | struct atalk_iface *fiface = NULL; | |
348 | struct atalk_addr *retval; | |
349 | struct atalk_iface *iface; | |
350 | ||
351 | /* | |
352 | * Return a point-to-point interface only if | |
353 | * there is no non-ptp interface available. | |
354 | */ | |
355 | read_lock_bh(&atalk_interfaces_lock); | |
356 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
357 | if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) | |
358 | fiface = iface; | |
359 | if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { | |
360 | retval = &iface->address; | |
361 | goto out; | |
362 | } | |
363 | } | |
364 | ||
365 | if (fiface) | |
366 | retval = &fiface->address; | |
367 | else if (atalk_interfaces) | |
368 | retval = &atalk_interfaces->address; | |
369 | else | |
370 | retval = NULL; | |
371 | out: | |
372 | read_unlock_bh(&atalk_interfaces_lock); | |
373 | return retval; | |
374 | } | |
375 | ||
376 | /* | |
377 | * Find a match for 'any network' - ie any of our interfaces with that | |
378 | * node number will do just nicely. | |
379 | */ | |
380 | static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) | |
381 | { | |
382 | struct atalk_iface *iface = dev->atalk_ptr; | |
383 | ||
384 | if (!iface || iface->status & ATIF_PROBE) | |
385 | goto out_err; | |
386 | ||
387 | if (node != ATADDR_BCAST && | |
388 | iface->address.s_node != node && | |
389 | node != ATADDR_ANYNODE) | |
390 | goto out_err; | |
391 | out: | |
392 | return iface; | |
393 | out_err: | |
394 | iface = NULL; | |
395 | goto out; | |
396 | } | |
397 | ||
398 | /* Find a match for a specific network:node pair */ | |
f6e276ee | 399 | static struct atalk_iface *atalk_find_interface(__be16 net, int node) |
1da177e4 LT |
400 | { |
401 | struct atalk_iface *iface; | |
402 | ||
403 | read_lock_bh(&atalk_interfaces_lock); | |
404 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
405 | if ((node == ATADDR_BCAST || | |
406 | node == ATADDR_ANYNODE || | |
407 | iface->address.s_node == node) && | |
408 | iface->address.s_net == net && | |
409 | !(iface->status & ATIF_PROBE)) | |
410 | break; | |
411 | ||
412 | /* XXXX.0 -- net.0 returns the iface associated with net */ | |
413 | if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && | |
414 | ntohs(iface->nets.nr_firstnet) <= ntohs(net) && | |
415 | ntohs(net) <= ntohs(iface->nets.nr_lastnet)) | |
ed4477b9 | 416 | break; |
1da177e4 LT |
417 | } |
418 | read_unlock_bh(&atalk_interfaces_lock); | |
419 | return iface; | |
420 | } | |
421 | ||
422 | ||
423 | /* | |
424 | * Find a route for an AppleTalk packet. This ought to get cached in | |
425 | * the socket (later on...). We know about host routes and the fact | |
426 | * that a route must be direct to broadcast. | |
427 | */ | |
428 | static struct atalk_route *atrtr_find(struct atalk_addr *target) | |
429 | { | |
430 | /* | |
ed4477b9 | 431 | * we must search through all routes unless we find a |
1da177e4 LT |
432 | * host route, because some host routes might overlap |
433 | * network routes | |
434 | */ | |
435 | struct atalk_route *net_route = NULL; | |
436 | struct atalk_route *r; | |
ed4477b9 | 437 | |
1da177e4 LT |
438 | read_lock_bh(&atalk_routes_lock); |
439 | for (r = atalk_routes; r; r = r->next) { | |
440 | if (!(r->flags & RTF_UP)) | |
441 | continue; | |
442 | ||
443 | if (r->target.s_net == target->s_net) { | |
444 | if (r->flags & RTF_HOST) { | |
445 | /* | |
446 | * if this host route is for the target, | |
447 | * the we're done | |
448 | */ | |
449 | if (r->target.s_node == target->s_node) | |
450 | goto out; | |
451 | } else | |
452 | /* | |
453 | * this route will work if there isn't a | |
454 | * direct host route, so cache it | |
455 | */ | |
456 | net_route = r; | |
457 | } | |
458 | } | |
ed4477b9 YH |
459 | |
460 | /* | |
1da177e4 LT |
461 | * if we found a network route but not a direct host |
462 | * route, then return it | |
463 | */ | |
464 | if (net_route) | |
465 | r = net_route; | |
466 | else if (atrtr_default.dev) | |
467 | r = &atrtr_default; | |
468 | else /* No route can be found */ | |
469 | r = NULL; | |
470 | out: | |
471 | read_unlock_bh(&atalk_routes_lock); | |
472 | return r; | |
473 | } | |
474 | ||
475 | ||
476 | /* | |
477 | * Given an AppleTalk network, find the device to use. This can be | |
478 | * a simple lookup. | |
479 | */ | |
480 | struct net_device *atrtr_get_dev(struct atalk_addr *sa) | |
481 | { | |
482 | struct atalk_route *atr = atrtr_find(sa); | |
483 | return atr ? atr->dev : NULL; | |
484 | } | |
485 | ||
486 | /* Set up a default router */ | |
487 | static void atrtr_set_default(struct net_device *dev) | |
488 | { | |
489 | atrtr_default.dev = dev; | |
490 | atrtr_default.flags = RTF_UP; | |
491 | atrtr_default.gateway.s_net = htons(0); | |
492 | atrtr_default.gateway.s_node = 0; | |
493 | } | |
494 | ||
495 | /* | |
496 | * Add a router. Basically make sure it looks valid and stuff the | |
497 | * entry in the list. While it uses netranges we always set them to one | |
498 | * entry to work like netatalk. | |
499 | */ | |
500 | static int atrtr_create(struct rtentry *r, struct net_device *devhint) | |
501 | { | |
502 | struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; | |
503 | struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; | |
504 | struct atalk_route *rt; | |
505 | struct atalk_iface *iface, *riface; | |
506 | int retval = -EINVAL; | |
507 | ||
508 | /* | |
509 | * Fixme: Raise/Lower a routing change semaphore for these | |
510 | * operations. | |
511 | */ | |
512 | ||
513 | /* Validate the request */ | |
514 | if (ta->sat_family != AF_APPLETALK || | |
515 | (!devhint && ga->sat_family != AF_APPLETALK)) | |
516 | goto out; | |
517 | ||
518 | /* Now walk the routing table and make our decisions */ | |
519 | write_lock_bh(&atalk_routes_lock); | |
520 | for (rt = atalk_routes; rt; rt = rt->next) { | |
521 | if (r->rt_flags != rt->flags) | |
522 | continue; | |
523 | ||
524 | if (ta->sat_addr.s_net == rt->target.s_net) { | |
525 | if (!(rt->flags & RTF_HOST)) | |
526 | break; | |
527 | if (ta->sat_addr.s_node == rt->target.s_node) | |
528 | break; | |
529 | } | |
530 | } | |
531 | ||
532 | if (!devhint) { | |
533 | riface = NULL; | |
534 | ||
535 | read_lock_bh(&atalk_interfaces_lock); | |
536 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
537 | if (!riface && | |
538 | ntohs(ga->sat_addr.s_net) >= | |
ed4477b9 | 539 | ntohs(iface->nets.nr_firstnet) && |
1da177e4 | 540 | ntohs(ga->sat_addr.s_net) <= |
ed4477b9 | 541 | ntohs(iface->nets.nr_lastnet)) |
1da177e4 LT |
542 | riface = iface; |
543 | ||
544 | if (ga->sat_addr.s_net == iface->address.s_net && | |
545 | ga->sat_addr.s_node == iface->address.s_node) | |
546 | riface = iface; | |
ed4477b9 | 547 | } |
1da177e4 LT |
548 | read_unlock_bh(&atalk_interfaces_lock); |
549 | ||
550 | retval = -ENETUNREACH; | |
551 | if (!riface) | |
552 | goto out_unlock; | |
553 | ||
554 | devhint = riface->dev; | |
555 | } | |
556 | ||
557 | if (!rt) { | |
0da974f4 | 558 | rt = kzalloc(sizeof(*rt), GFP_ATOMIC); |
1da177e4 LT |
559 | |
560 | retval = -ENOBUFS; | |
561 | if (!rt) | |
562 | goto out_unlock; | |
1da177e4 LT |
563 | |
564 | rt->next = atalk_routes; | |
565 | atalk_routes = rt; | |
566 | } | |
567 | ||
568 | /* Fill in the routing entry */ | |
569 | rt->target = ta->sat_addr; | |
c7f905f0 | 570 | dev_hold(devhint); |
1da177e4 LT |
571 | rt->dev = devhint; |
572 | rt->flags = r->rt_flags; | |
573 | rt->gateway = ga->sat_addr; | |
574 | ||
575 | retval = 0; | |
576 | out_unlock: | |
577 | write_unlock_bh(&atalk_routes_lock); | |
578 | out: | |
579 | return retval; | |
580 | } | |
581 | ||
582 | /* Delete a route. Find it and discard it */ | |
6f0984a0 | 583 | static int atrtr_delete(struct atalk_addr *addr) |
1da177e4 LT |
584 | { |
585 | struct atalk_route **r = &atalk_routes; | |
586 | int retval = 0; | |
587 | struct atalk_route *tmp; | |
588 | ||
589 | write_lock_bh(&atalk_routes_lock); | |
590 | while ((tmp = *r) != NULL) { | |
591 | if (tmp->target.s_net == addr->s_net && | |
592 | (!(tmp->flags&RTF_GATEWAY) || | |
593 | tmp->target.s_node == addr->s_node)) { | |
594 | *r = tmp->next; | |
595 | dev_put(tmp->dev); | |
596 | kfree(tmp); | |
597 | goto out; | |
598 | } | |
599 | r = &tmp->next; | |
600 | } | |
601 | retval = -ENOENT; | |
602 | out: | |
603 | write_unlock_bh(&atalk_routes_lock); | |
604 | return retval; | |
605 | } | |
606 | ||
607 | /* | |
608 | * Called when a device is downed. Just throw away any routes | |
609 | * via it. | |
610 | */ | |
611 | static void atrtr_device_down(struct net_device *dev) | |
612 | { | |
613 | struct atalk_route **r = &atalk_routes; | |
614 | struct atalk_route *tmp; | |
615 | ||
616 | write_lock_bh(&atalk_routes_lock); | |
617 | while ((tmp = *r) != NULL) { | |
618 | if (tmp->dev == dev) { | |
619 | *r = tmp->next; | |
620 | dev_put(dev); | |
621 | kfree(tmp); | |
622 | } else | |
623 | r = &tmp->next; | |
624 | } | |
625 | write_unlock_bh(&atalk_routes_lock); | |
626 | ||
627 | if (atrtr_default.dev == dev) | |
628 | atrtr_set_default(NULL); | |
629 | } | |
630 | ||
631 | /* Actually down the interface */ | |
632 | static inline void atalk_dev_down(struct net_device *dev) | |
633 | { | |
634 | atrtr_device_down(dev); /* Remove all routes for the device */ | |
635 | aarp_device_down(dev); /* Remove AARP entries for the device */ | |
636 | atif_drop_device(dev); /* Remove the device */ | |
637 | } | |
638 | ||
639 | /* | |
640 | * A device event has occurred. Watch for devices going down and | |
641 | * delete our use of them (iface and route). | |
642 | */ | |
643 | static int ddp_device_event(struct notifier_block *this, unsigned long event, | |
644 | void *ptr) | |
645 | { | |
351638e7 | 646 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
890d52d3 | 647 | |
721499e8 | 648 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
649 | return NOTIFY_DONE; |
650 | ||
1da177e4 LT |
651 | if (event == NETDEV_DOWN) |
652 | /* Discard any use of this */ | |
890d52d3 | 653 | atalk_dev_down(dev); |
1da177e4 LT |
654 | |
655 | return NOTIFY_DONE; | |
656 | } | |
657 | ||
658 | /* ioctl calls. Shouldn't even need touching */ | |
659 | /* Device configuration ioctl calls */ | |
660 | static int atif_ioctl(int cmd, void __user *arg) | |
661 | { | |
662 | static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; | |
663 | struct ifreq atreq; | |
664 | struct atalk_netrange *nr; | |
665 | struct sockaddr_at *sa; | |
666 | struct net_device *dev; | |
667 | struct atalk_iface *atif; | |
668 | int ct; | |
669 | int limit; | |
670 | struct rtentry rtdef; | |
671 | int add_route; | |
672 | ||
673 | if (copy_from_user(&atreq, arg, sizeof(atreq))) | |
674 | return -EFAULT; | |
675 | ||
881d966b | 676 | dev = __dev_get_by_name(&init_net, atreq.ifr_name); |
1da177e4 LT |
677 | if (!dev) |
678 | return -ENODEV; | |
679 | ||
680 | sa = (struct sockaddr_at *)&atreq.ifr_addr; | |
681 | atif = atalk_find_dev(dev); | |
682 | ||
683 | switch (cmd) { | |
4a9e4b09 JP |
684 | case SIOCSIFADDR: |
685 | if (!capable(CAP_NET_ADMIN)) | |
686 | return -EPERM; | |
687 | if (sa->sat_family != AF_APPLETALK) | |
688 | return -EINVAL; | |
689 | if (dev->type != ARPHRD_ETHER && | |
690 | dev->type != ARPHRD_LOOPBACK && | |
691 | dev->type != ARPHRD_LOCALTLK && | |
692 | dev->type != ARPHRD_PPP) | |
693 | return -EPROTONOSUPPORT; | |
694 | ||
695 | nr = (struct atalk_netrange *)&sa->sat_zero[0]; | |
696 | add_route = 1; | |
697 | ||
698 | /* | |
699 | * if this is a point-to-point iface, and we already | |
700 | * have an iface for this AppleTalk address, then we | |
701 | * should not add a route | |
702 | */ | |
703 | if ((dev->flags & IFF_POINTOPOINT) && | |
704 | atalk_find_interface(sa->sat_addr.s_net, | |
705 | sa->sat_addr.s_node)) { | |
706 | printk(KERN_DEBUG "AppleTalk: point-to-point " | |
707 | "interface added with " | |
708 | "existing address\n"); | |
709 | add_route = 0; | |
710 | } | |
1da177e4 | 711 | |
4a9e4b09 JP |
712 | /* |
713 | * Phase 1 is fine on LocalTalk but we don't do | |
714 | * EtherTalk phase 1. Anyone wanting to add it go ahead. | |
715 | */ | |
716 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
717 | return -EPROTONOSUPPORT; | |
718 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
719 | sa->sat_addr.s_node == 254) | |
720 | return -EINVAL; | |
721 | if (atif) { | |
722 | /* Already setting address */ | |
723 | if (atif->status & ATIF_PROBE) | |
724 | return -EBUSY; | |
725 | ||
726 | atif->address.s_net = sa->sat_addr.s_net; | |
727 | atif->address.s_node = sa->sat_addr.s_node; | |
728 | atrtr_device_down(dev); /* Flush old routes */ | |
729 | } else { | |
730 | atif = atif_add_device(dev, &sa->sat_addr); | |
1da177e4 | 731 | if (!atif) |
4a9e4b09 JP |
732 | return -ENOMEM; |
733 | } | |
734 | atif->nets = *nr; | |
735 | ||
736 | /* | |
737 | * Check if the chosen address is used. If so we | |
738 | * error and atalkd will try another. | |
739 | */ | |
740 | ||
741 | if (!(dev->flags & IFF_LOOPBACK) && | |
742 | !(dev->flags & IFF_POINTOPOINT) && | |
743 | atif_probe_device(atif) < 0) { | |
744 | atif_drop_device(dev); | |
745 | return -EADDRINUSE; | |
746 | } | |
1da177e4 | 747 | |
4a9e4b09 JP |
748 | /* Hey it worked - add the direct routes */ |
749 | sa = (struct sockaddr_at *)&rtdef.rt_gateway; | |
750 | sa->sat_family = AF_APPLETALK; | |
751 | sa->sat_addr.s_net = atif->address.s_net; | |
752 | sa->sat_addr.s_node = atif->address.s_node; | |
753 | sa = (struct sockaddr_at *)&rtdef.rt_dst; | |
754 | rtdef.rt_flags = RTF_UP; | |
755 | sa->sat_family = AF_APPLETALK; | |
756 | sa->sat_addr.s_node = ATADDR_ANYNODE; | |
757 | if (dev->flags & IFF_LOOPBACK || | |
758 | dev->flags & IFF_POINTOPOINT) | |
759 | rtdef.rt_flags |= RTF_HOST; | |
760 | ||
761 | /* Routerless initial state */ | |
762 | if (nr->nr_firstnet == htons(0) && | |
763 | nr->nr_lastnet == htons(0xFFFE)) { | |
1da177e4 | 764 | sa->sat_addr.s_net = atif->address.s_net; |
4a9e4b09 JP |
765 | atrtr_create(&rtdef, dev); |
766 | atrtr_set_default(dev); | |
767 | } else { | |
768 | limit = ntohs(nr->nr_lastnet); | |
769 | if (limit - ntohs(nr->nr_firstnet) > 4096) { | |
770 | printk(KERN_WARNING "Too many routes/" | |
771 | "iface.\n"); | |
1da177e4 | 772 | return -EINVAL; |
4a9e4b09 JP |
773 | } |
774 | if (add_route) | |
775 | for (ct = ntohs(nr->nr_firstnet); | |
776 | ct <= limit; ct++) { | |
777 | sa->sat_addr.s_net = htons(ct); | |
778 | atrtr_create(&rtdef, dev); | |
779 | } | |
780 | } | |
781 | dev_mc_add_global(dev, aarp_mcast); | |
782 | return 0; | |
783 | ||
784 | case SIOCGIFADDR: | |
785 | if (!atif) | |
786 | return -EADDRNOTAVAIL; | |
787 | ||
788 | sa->sat_family = AF_APPLETALK; | |
789 | sa->sat_addr = atif->address; | |
790 | break; | |
791 | ||
792 | case SIOCGIFBRDADDR: | |
793 | if (!atif) | |
794 | return -EADDRNOTAVAIL; | |
795 | ||
796 | sa->sat_family = AF_APPLETALK; | |
797 | sa->sat_addr.s_net = atif->address.s_net; | |
798 | sa->sat_addr.s_node = ATADDR_BCAST; | |
799 | break; | |
800 | ||
801 | case SIOCATALKDIFADDR: | |
802 | case SIOCDIFADDR: | |
803 | if (!capable(CAP_NET_ADMIN)) | |
804 | return -EPERM; | |
805 | if (sa->sat_family != AF_APPLETALK) | |
806 | return -EINVAL; | |
807 | atalk_dev_down(dev); | |
808 | break; | |
809 | ||
810 | case SIOCSARP: | |
811 | if (!capable(CAP_NET_ADMIN)) | |
812 | return -EPERM; | |
813 | if (sa->sat_family != AF_APPLETALK) | |
814 | return -EINVAL; | |
815 | /* | |
816 | * for now, we only support proxy AARP on ELAP; | |
817 | * we should be able to do it for LocalTalk, too. | |
818 | */ | |
819 | if (dev->type != ARPHRD_ETHER) | |
820 | return -EPROTONOSUPPORT; | |
821 | ||
822 | /* | |
823 | * atif points to the current interface on this network; | |
824 | * we aren't concerned about its current status (at | |
825 | * least for now), but it has all the settings about | |
826 | * the network we're going to probe. Consequently, it | |
827 | * must exist. | |
828 | */ | |
829 | if (!atif) | |
830 | return -EADDRNOTAVAIL; | |
831 | ||
832 | nr = (struct atalk_netrange *)&(atif->nets); | |
833 | /* | |
834 | * Phase 1 is fine on Localtalk but we don't do | |
835 | * Ethertalk phase 1. Anyone wanting to add it go ahead. | |
836 | */ | |
837 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
838 | return -EPROTONOSUPPORT; | |
839 | ||
840 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
841 | sa->sat_addr.s_node == 254) | |
842 | return -EINVAL; | |
843 | ||
844 | /* | |
845 | * Check if the chosen address is used. If so we | |
846 | * error and ATCP will try another. | |
847 | */ | |
848 | if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) | |
849 | return -EADDRINUSE; | |
850 | ||
851 | /* | |
852 | * We now have an address on the local network, and | |
853 | * the AARP code will defend it for us until we take it | |
854 | * down. We don't set up any routes right now, because | |
855 | * ATCP will install them manually via SIOCADDRT. | |
856 | */ | |
857 | break; | |
858 | ||
859 | case SIOCDARP: | |
860 | if (!capable(CAP_NET_ADMIN)) | |
861 | return -EPERM; | |
862 | if (sa->sat_family != AF_APPLETALK) | |
863 | return -EINVAL; | |
864 | if (!atif) | |
865 | return -EADDRNOTAVAIL; | |
866 | ||
867 | /* give to aarp module to remove proxy entry */ | |
868 | aarp_proxy_remove(atif->dev, &(sa->sat_addr)); | |
869 | return 0; | |
1da177e4 LT |
870 | } |
871 | ||
872 | return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; | |
873 | } | |
874 | ||
875 | /* Routing ioctl() calls */ | |
876 | static int atrtr_ioctl(unsigned int cmd, void __user *arg) | |
877 | { | |
878 | struct rtentry rt; | |
879 | ||
880 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
881 | return -EFAULT; | |
882 | ||
883 | switch (cmd) { | |
4a9e4b09 JP |
884 | case SIOCDELRT: |
885 | if (rt.rt_dst.sa_family != AF_APPLETALK) | |
886 | return -EINVAL; | |
887 | return atrtr_delete(&((struct sockaddr_at *) | |
888 | &rt.rt_dst)->sat_addr); | |
889 | ||
890 | case SIOCADDRT: { | |
891 | struct net_device *dev = NULL; | |
892 | if (rt.rt_dev) { | |
893 | char name[IFNAMSIZ]; | |
894 | if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1)) | |
895 | return -EFAULT; | |
896 | name[IFNAMSIZ-1] = '\0'; | |
897 | dev = __dev_get_by_name(&init_net, name); | |
898 | if (!dev) | |
899 | return -ENODEV; | |
1da177e4 | 900 | } |
4a9e4b09 JP |
901 | return atrtr_create(&rt, dev); |
902 | } | |
1da177e4 LT |
903 | } |
904 | return -EINVAL; | |
905 | } | |
906 | ||
907 | /**************************************************************************\ | |
908 | * * | |
909 | * Handling for system calls applied via the various interfaces to an * | |
910 | * AppleTalk socket object. * | |
911 | * * | |
912 | \**************************************************************************/ | |
913 | ||
914 | /* | |
915 | * Checksum: This is 'optional'. It's quite likely also a good | |
916 | * candidate for assembler hackery 8) | |
917 | */ | |
ed4477b9 | 918 | static unsigned long atalk_sum_partial(const unsigned char *data, |
1da177e4 LT |
919 | int len, unsigned long sum) |
920 | { | |
921 | /* This ought to be unwrapped neatly. I'll trust gcc for now */ | |
922 | while (len--) { | |
f7a3a1d8 JP |
923 | sum += *data++; |
924 | sum = rol16(sum, 1); | |
1da177e4 LT |
925 | } |
926 | return sum; | |
927 | } | |
928 | ||
929 | /* Checksum skb data -- similar to skb_checksum */ | |
930 | static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, | |
931 | int len, unsigned long sum) | |
932 | { | |
1a028e50 | 933 | int start = skb_headlen(skb); |
c32ba3f9 | 934 | struct sk_buff *frag_iter; |
1da177e4 LT |
935 | int i, copy; |
936 | ||
937 | /* checksum stuff in header space */ | |
fd1dc261 | 938 | if ((copy = start - offset) > 0) { |
1da177e4 LT |
939 | if (copy > len) |
940 | copy = len; | |
941 | sum = atalk_sum_partial(skb->data + offset, copy, sum); | |
fd1dc261 | 942 | if ((len -= copy) == 0) |
1da177e4 LT |
943 | return sum; |
944 | ||
945 | offset += copy; | |
946 | } | |
947 | ||
948 | /* checksum stuff in frags */ | |
949 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1a028e50 | 950 | int end; |
9e903e08 | 951 | const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
547b792c | 952 | WARN_ON(start > offset + len); |
1a028e50 | 953 | |
9e903e08 | 954 | end = start + skb_frag_size(frag); |
1da177e4 LT |
955 | if ((copy = end - offset) > 0) { |
956 | u8 *vaddr; | |
1da177e4 LT |
957 | |
958 | if (copy > len) | |
959 | copy = len; | |
51c56b00 | 960 | vaddr = kmap_atomic(skb_frag_page(frag)); |
1a028e50 DM |
961 | sum = atalk_sum_partial(vaddr + frag->page_offset + |
962 | offset - start, copy, sum); | |
51c56b00 | 963 | kunmap_atomic(vaddr); |
1da177e4 LT |
964 | |
965 | if (!(len -= copy)) | |
966 | return sum; | |
967 | offset += copy; | |
968 | } | |
1a028e50 | 969 | start = end; |
1da177e4 LT |
970 | } |
971 | ||
c32ba3f9 DM |
972 | skb_walk_frags(skb, frag_iter) { |
973 | int end; | |
1a028e50 | 974 | |
c32ba3f9 | 975 | WARN_ON(start > offset + len); |
1da177e4 | 976 | |
c32ba3f9 DM |
977 | end = start + frag_iter->len; |
978 | if ((copy = end - offset) > 0) { | |
979 | if (copy > len) | |
980 | copy = len; | |
981 | sum = atalk_sum_skb(frag_iter, offset - start, | |
982 | copy, sum); | |
983 | if ((len -= copy) == 0) | |
984 | return sum; | |
985 | offset += copy; | |
1da177e4 | 986 | } |
c32ba3f9 | 987 | start = end; |
1da177e4 LT |
988 | } |
989 | ||
990 | BUG_ON(len > 0); | |
991 | ||
992 | return sum; | |
993 | } | |
994 | ||
2a50f28c | 995 | static __be16 atalk_checksum(const struct sk_buff *skb, int len) |
1da177e4 LT |
996 | { |
997 | unsigned long sum; | |
998 | ||
999 | /* skip header 4 bytes */ | |
1000 | sum = atalk_sum_skb(skb, 4, len-4, 0); | |
1001 | ||
1002 | /* Use 0xFFFF for 0. 0 itself means none */ | |
2a50f28c | 1003 | return sum ? htons((unsigned short)sum) : htons(0xFFFF); |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | static struct proto ddp_proto = { | |
1007 | .name = "DDP", | |
1008 | .owner = THIS_MODULE, | |
1009 | .obj_size = sizeof(struct atalk_sock), | |
1010 | }; | |
1011 | ||
1012 | /* | |
1013 | * Create a socket. Initialise the socket, blank the addresses | |
1014 | * set the state. | |
1015 | */ | |
3f378b68 EP |
1016 | static int atalk_create(struct net *net, struct socket *sock, int protocol, |
1017 | int kern) | |
1da177e4 LT |
1018 | { |
1019 | struct sock *sk; | |
1020 | int rc = -ESOCKTNOSUPPORT; | |
1021 | ||
09ad9bc7 | 1022 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
1023 | return -EAFNOSUPPORT; |
1024 | ||
1da177e4 LT |
1025 | /* |
1026 | * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do | |
ed4477b9 | 1027 | * and gives you the full ELAP frame. Should be handy for CAP 8) |
1da177e4 LT |
1028 | */ |
1029 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) | |
1030 | goto out; | |
1031 | rc = -ENOMEM; | |
11aa9c28 | 1032 | sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, kern); |
1da177e4 LT |
1033 | if (!sk) |
1034 | goto out; | |
1035 | rc = 0; | |
1036 | sock->ops = &atalk_dgram_ops; | |
1037 | sock_init_data(sock, sk); | |
1038 | ||
1039 | /* Checksums on by default */ | |
1040 | sock_set_flag(sk, SOCK_ZAPPED); | |
1041 | out: | |
1042 | return rc; | |
1043 | } | |
1044 | ||
1045 | /* Free a socket. No work needed */ | |
1046 | static int atalk_release(struct socket *sock) | |
1047 | { | |
1048 | struct sock *sk = sock->sk; | |
1049 | ||
1050 | if (sk) { | |
c100c8f4 DM |
1051 | sock_hold(sk); |
1052 | lock_sock(sk); | |
1053 | ||
1da177e4 LT |
1054 | sock_orphan(sk); |
1055 | sock->sk = NULL; | |
1056 | atalk_destroy_socket(sk); | |
b20e7bbf | 1057 | |
c100c8f4 DM |
1058 | release_sock(sk); |
1059 | sock_put(sk); | |
1060 | } | |
1da177e4 LT |
1061 | return 0; |
1062 | } | |
1063 | ||
1064 | /** | |
1065 | * atalk_pick_and_bind_port - Pick a source port when one is not given | |
2c53040f BH |
1066 | * @sk: socket to insert into the tables |
1067 | * @sat: address to search for | |
1da177e4 LT |
1068 | * |
1069 | * Pick a source port when one is not given. If we can find a suitable free | |
1070 | * one, we insert the socket into the tables using it. | |
1071 | * | |
1072 | * This whole operation must be atomic. | |
1073 | */ | |
1074 | static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat) | |
1075 | { | |
1076 | int retval; | |
1077 | ||
1078 | write_lock_bh(&atalk_sockets_lock); | |
1079 | ||
1080 | for (sat->sat_port = ATPORT_RESERVED; | |
1081 | sat->sat_port < ATPORT_LAST; | |
1082 | sat->sat_port++) { | |
1083 | struct sock *s; | |
1da177e4 | 1084 | |
b67bfe0d | 1085 | sk_for_each(s, &atalk_sockets) { |
1da177e4 LT |
1086 | struct atalk_sock *at = at_sk(s); |
1087 | ||
1088 | if (at->src_net == sat->sat_addr.s_net && | |
1089 | at->src_node == sat->sat_addr.s_node && | |
1090 | at->src_port == sat->sat_port) | |
1091 | goto try_next_port; | |
1092 | } | |
1093 | ||
1094 | /* Wheee, it's free, assign and insert. */ | |
1095 | __atalk_insert_socket(sk); | |
1096 | at_sk(sk)->src_port = sat->sat_port; | |
1097 | retval = 0; | |
1098 | goto out; | |
1099 | ||
1100 | try_next_port:; | |
1101 | } | |
1102 | ||
1103 | retval = -EBUSY; | |
1104 | out: | |
1105 | write_unlock_bh(&atalk_sockets_lock); | |
1106 | return retval; | |
1107 | } | |
1108 | ||
1109 | static int atalk_autobind(struct sock *sk) | |
1110 | { | |
1111 | struct atalk_sock *at = at_sk(sk); | |
1112 | struct sockaddr_at sat; | |
1113 | struct atalk_addr *ap = atalk_find_primary(); | |
1114 | int n = -EADDRNOTAVAIL; | |
1115 | ||
1116 | if (!ap || ap->s_net == htons(ATADDR_ANYNET)) | |
1117 | goto out; | |
1118 | ||
1119 | at->src_net = sat.sat_addr.s_net = ap->s_net; | |
1120 | at->src_node = sat.sat_addr.s_node = ap->s_node; | |
1121 | ||
1122 | n = atalk_pick_and_bind_port(sk, &sat); | |
1123 | if (!n) | |
1124 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1125 | out: | |
1126 | return n; | |
1127 | } | |
1128 | ||
1129 | /* Set the address 'our end' of the connection */ | |
1130 | static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1131 | { | |
1132 | struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; | |
1133 | struct sock *sk = sock->sk; | |
1134 | struct atalk_sock *at = at_sk(sk); | |
ecced8ba | 1135 | int err; |
1da177e4 LT |
1136 | |
1137 | if (!sock_flag(sk, SOCK_ZAPPED) || | |
1138 | addr_len != sizeof(struct sockaddr_at)) | |
1139 | return -EINVAL; | |
1140 | ||
1141 | if (addr->sat_family != AF_APPLETALK) | |
1142 | return -EAFNOSUPPORT; | |
1143 | ||
60d9f461 | 1144 | lock_sock(sk); |
1da177e4 LT |
1145 | if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { |
1146 | struct atalk_addr *ap = atalk_find_primary(); | |
1147 | ||
ecced8ba | 1148 | err = -EADDRNOTAVAIL; |
1da177e4 | 1149 | if (!ap) |
ecced8ba | 1150 | goto out; |
1da177e4 LT |
1151 | |
1152 | at->src_net = addr->sat_addr.s_net = ap->s_net; | |
fd1dc261 | 1153 | at->src_node = addr->sat_addr.s_node = ap->s_node; |
1da177e4 | 1154 | } else { |
ecced8ba | 1155 | err = -EADDRNOTAVAIL; |
1da177e4 LT |
1156 | if (!atalk_find_interface(addr->sat_addr.s_net, |
1157 | addr->sat_addr.s_node)) | |
ecced8ba | 1158 | goto out; |
1da177e4 LT |
1159 | |
1160 | at->src_net = addr->sat_addr.s_net; | |
1161 | at->src_node = addr->sat_addr.s_node; | |
1162 | } | |
1163 | ||
1164 | if (addr->sat_port == ATADDR_ANYPORT) { | |
ecced8ba | 1165 | err = atalk_pick_and_bind_port(sk, addr); |
1da177e4 | 1166 | |
ecced8ba AB |
1167 | if (err < 0) |
1168 | goto out; | |
1da177e4 LT |
1169 | } else { |
1170 | at->src_port = addr->sat_port; | |
1171 | ||
ecced8ba | 1172 | err = -EADDRINUSE; |
1da177e4 | 1173 | if (atalk_find_or_insert_socket(sk, addr)) |
ecced8ba | 1174 | goto out; |
1da177e4 LT |
1175 | } |
1176 | ||
1177 | sock_reset_flag(sk, SOCK_ZAPPED); | |
ecced8ba AB |
1178 | err = 0; |
1179 | out: | |
60d9f461 | 1180 | release_sock(sk); |
ecced8ba | 1181 | return err; |
1da177e4 LT |
1182 | } |
1183 | ||
1184 | /* Set the address we talk to */ | |
1185 | static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, | |
1186 | int addr_len, int flags) | |
1187 | { | |
1188 | struct sock *sk = sock->sk; | |
1189 | struct atalk_sock *at = at_sk(sk); | |
1190 | struct sockaddr_at *addr; | |
ecced8ba | 1191 | int err; |
1da177e4 LT |
1192 | |
1193 | sk->sk_state = TCP_CLOSE; | |
1194 | sock->state = SS_UNCONNECTED; | |
1195 | ||
1196 | if (addr_len != sizeof(*addr)) | |
1197 | return -EINVAL; | |
1198 | ||
1199 | addr = (struct sockaddr_at *)uaddr; | |
1200 | ||
1201 | if (addr->sat_family != AF_APPLETALK) | |
1202 | return -EAFNOSUPPORT; | |
1203 | ||
1204 | if (addr->sat_addr.s_node == ATADDR_BCAST && | |
1205 | !sock_flag(sk, SOCK_BROADCAST)) { | |
ed4477b9 | 1206 | #if 1 |
278f015e | 1207 | pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n", |
1da177e4 LT |
1208 | current->comm); |
1209 | #else | |
1210 | return -EACCES; | |
ed4477b9 | 1211 | #endif |
1da177e4 LT |
1212 | } |
1213 | ||
60d9f461 | 1214 | lock_sock(sk); |
ecced8ba | 1215 | err = -EBUSY; |
1da177e4 LT |
1216 | if (sock_flag(sk, SOCK_ZAPPED)) |
1217 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1218 | goto out; |
1da177e4 | 1219 | |
ecced8ba | 1220 | err = -ENETUNREACH; |
1da177e4 | 1221 | if (!atrtr_get_dev(&addr->sat_addr)) |
ecced8ba | 1222 | goto out; |
1da177e4 LT |
1223 | |
1224 | at->dest_port = addr->sat_port; | |
1225 | at->dest_net = addr->sat_addr.s_net; | |
1226 | at->dest_node = addr->sat_addr.s_node; | |
1227 | ||
1228 | sock->state = SS_CONNECTED; | |
1229 | sk->sk_state = TCP_ESTABLISHED; | |
ecced8ba AB |
1230 | err = 0; |
1231 | out: | |
60d9f461 | 1232 | release_sock(sk); |
ecced8ba | 1233 | return err; |
1da177e4 LT |
1234 | } |
1235 | ||
1236 | /* | |
1237 | * Find the name of an AppleTalk socket. Just copy the right | |
1238 | * fields into the sockaddr. | |
1239 | */ | |
1240 | static int atalk_getname(struct socket *sock, struct sockaddr *uaddr, | |
1241 | int *uaddr_len, int peer) | |
1242 | { | |
1243 | struct sockaddr_at sat; | |
1244 | struct sock *sk = sock->sk; | |
1245 | struct atalk_sock *at = at_sk(sk); | |
ecced8ba | 1246 | int err; |
1da177e4 | 1247 | |
60d9f461 | 1248 | lock_sock(sk); |
ecced8ba | 1249 | err = -ENOBUFS; |
1da177e4 LT |
1250 | if (sock_flag(sk, SOCK_ZAPPED)) |
1251 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1252 | goto out; |
1da177e4 LT |
1253 | |
1254 | *uaddr_len = sizeof(struct sockaddr_at); | |
fccc9f1f | 1255 | memset(&sat, 0, sizeof(sat)); |
1da177e4 LT |
1256 | |
1257 | if (peer) { | |
ecced8ba | 1258 | err = -ENOTCONN; |
1da177e4 | 1259 | if (sk->sk_state != TCP_ESTABLISHED) |
ecced8ba | 1260 | goto out; |
1da177e4 LT |
1261 | |
1262 | sat.sat_addr.s_net = at->dest_net; | |
1263 | sat.sat_addr.s_node = at->dest_node; | |
1264 | sat.sat_port = at->dest_port; | |
1265 | } else { | |
1266 | sat.sat_addr.s_net = at->src_net; | |
1267 | sat.sat_addr.s_node = at->src_node; | |
1268 | sat.sat_port = at->src_port; | |
1269 | } | |
1270 | ||
ecced8ba | 1271 | err = 0; |
1da177e4 LT |
1272 | sat.sat_family = AF_APPLETALK; |
1273 | memcpy(uaddr, &sat, sizeof(sat)); | |
ecced8ba AB |
1274 | |
1275 | out: | |
60d9f461 | 1276 | release_sock(sk); |
ecced8ba | 1277 | return err; |
1da177e4 LT |
1278 | } |
1279 | ||
a73ec314 | 1280 | #if IS_ENABLED(CONFIG_IPDDP) |
1da177e4 LT |
1281 | static __inline__ int is_ip_over_ddp(struct sk_buff *skb) |
1282 | { | |
ed4477b9 | 1283 | return skb->data[12] == 22; |
1da177e4 LT |
1284 | } |
1285 | ||
1286 | static int handle_ip_over_ddp(struct sk_buff *skb) | |
1287 | { | |
881d966b | 1288 | struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0"); |
1da177e4 LT |
1289 | struct net_device_stats *stats; |
1290 | ||
1291 | /* This needs to be able to handle ipddp"N" devices */ | |
ffcfb8db ACM |
1292 | if (!dev) { |
1293 | kfree_skb(skb); | |
1294 | return NET_RX_DROP; | |
1295 | } | |
1da177e4 | 1296 | |
ed4477b9 YH |
1297 | skb->protocol = htons(ETH_P_IP); |
1298 | skb_pull(skb, 13); | |
1299 | skb->dev = dev; | |
badff6d0 | 1300 | skb_reset_transport_header(skb); |
1da177e4 | 1301 | |
524ad0a7 | 1302 | stats = netdev_priv(dev); |
ed4477b9 YH |
1303 | stats->rx_packets++; |
1304 | stats->rx_bytes += skb->len + 13; | |
ffcfb8db | 1305 | return netif_rx(skb); /* Send the SKB up to a higher place. */ |
1da177e4 LT |
1306 | } |
1307 | #else | |
1308 | /* make it easy for gcc to optimize this test out, i.e. kill the code */ | |
1309 | #define is_ip_over_ddp(skb) 0 | |
1310 | #define handle_ip_over_ddp(skb) 0 | |
1311 | #endif | |
1312 | ||
ffcfb8db ACM |
1313 | static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev, |
1314 | struct ddpehdr *ddp, __u16 len_hops, int origlen) | |
1da177e4 LT |
1315 | { |
1316 | struct atalk_route *rt; | |
1317 | struct atalk_addr ta; | |
1318 | ||
1319 | /* | |
1320 | * Don't route multicast, etc., packets, or packets sent to "this | |
ed4477b9 | 1321 | * network" |
1da177e4 LT |
1322 | */ |
1323 | if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { | |
1324 | /* | |
1325 | * FIXME: | |
1326 | * | |
1327 | * Can it ever happen that a packet is from a PPP iface and | |
1328 | * needs to be broadcast onto the default network? | |
1329 | */ | |
1330 | if (dev->type == ARPHRD_PPP) | |
1331 | printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " | |
1332 | "packet received from PPP iface\n"); | |
1333 | goto free_it; | |
1334 | } | |
1335 | ||
1336 | ta.s_net = ddp->deh_dnet; | |
1337 | ta.s_node = ddp->deh_dnode; | |
1338 | ||
1339 | /* Route the packet */ | |
1340 | rt = atrtr_find(&ta); | |
2a50f28c AV |
1341 | /* increment hops count */ |
1342 | len_hops += 1 << 10; | |
1343 | if (!rt || !(len_hops & (15 << 10))) | |
1da177e4 | 1344 | goto free_it; |
2a50f28c | 1345 | |
1da177e4 | 1346 | /* FIXME: use skb->cb to be able to use shared skbs */ |
1da177e4 LT |
1347 | |
1348 | /* | |
1349 | * Route goes through another gateway, so set the target to the | |
1350 | * gateway instead. | |
1351 | */ | |
1352 | ||
1353 | if (rt->flags & RTF_GATEWAY) { | |
1354 | ta.s_net = rt->gateway.s_net; | |
1355 | ta.s_node = rt->gateway.s_node; | |
1356 | } | |
1357 | ||
ed4477b9 YH |
1358 | /* Fix up skb->len field */ |
1359 | skb_trim(skb, min_t(unsigned int, origlen, | |
1da177e4 | 1360 | (rt->dev->hard_header_len + |
2a50f28c | 1361 | ddp_dl->header_length + (len_hops & 1023)))); |
1da177e4 | 1362 | |
1da177e4 | 1363 | /* FIXME: use skb->cb to be able to use shared skbs */ |
2a50f28c | 1364 | ddp->deh_len_hops = htons(len_hops); |
1da177e4 LT |
1365 | |
1366 | /* | |
1367 | * Send the buffer onwards | |
1368 | * | |
1369 | * Now we must always be careful. If it's come from LocalTalk to | |
1370 | * EtherTalk it might not fit | |
1371 | * | |
1372 | * Order matters here: If a packet has to be copied to make a new | |
1373 | * headroom (rare hopefully) then it won't need unsharing. | |
1374 | * | |
1375 | * Note. ddp-> becomes invalid at the realloc. | |
1376 | */ | |
1377 | if (skb_headroom(skb) < 22) { | |
1378 | /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ | |
1379 | struct sk_buff *nskb = skb_realloc_headroom(skb, 32); | |
1380 | kfree_skb(skb); | |
1da177e4 LT |
1381 | skb = nskb; |
1382 | } else | |
1383 | skb = skb_unshare(skb, GFP_ATOMIC); | |
ed4477b9 | 1384 | |
1da177e4 LT |
1385 | /* |
1386 | * If the buffer didn't vanish into the lack of space bitbucket we can | |
1387 | * send it. | |
1388 | */ | |
ffcfb8db ACM |
1389 | if (skb == NULL) |
1390 | goto drop; | |
1391 | ||
1392 | if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP) | |
1393 | return NET_RX_DROP; | |
8be8057e | 1394 | return NET_RX_SUCCESS; |
1da177e4 LT |
1395 | free_it: |
1396 | kfree_skb(skb); | |
ffcfb8db ACM |
1397 | drop: |
1398 | return NET_RX_DROP; | |
1da177e4 LT |
1399 | } |
1400 | ||
1401 | /** | |
1402 | * atalk_rcv - Receive a packet (in skb) from device dev | |
1403 | * @skb - packet received | |
1404 | * @dev - network device where the packet comes from | |
1405 | * @pt - packet type | |
1406 | * | |
1407 | * Receive a packet (in skb) from device dev. This has come from the SNAP | |
b0e380b1 ACM |
1408 | * decoder, and on entry skb->transport_header is the DDP header, skb->len |
1409 | * is the DDP header, skb->len is the DDP length. The physical headers | |
1410 | * have been extracted. PPP should probably pass frames marked as for this | |
1411 | * layer. [ie ARPHRD_ETHERTALK] | |
1da177e4 LT |
1412 | */ |
1413 | static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1414 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
1415 | { |
1416 | struct ddpehdr *ddp; | |
1417 | struct sock *sock; | |
1418 | struct atalk_iface *atif; | |
1419 | struct sockaddr_at tosat; | |
ed4477b9 | 1420 | int origlen; |
2a50f28c | 1421 | __u16 len_hops; |
1da177e4 | 1422 | |
721499e8 | 1423 | if (!net_eq(dev_net(dev), &init_net)) |
6885ffb3 | 1424 | goto drop; |
e730c155 | 1425 | |
1da177e4 | 1426 | /* Don't mangle buffer if shared */ |
ed4477b9 | 1427 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 | 1428 | goto out; |
ed4477b9 | 1429 | |
1da177e4 LT |
1430 | /* Size check and make sure header is contiguous */ |
1431 | if (!pskb_may_pull(skb, sizeof(*ddp))) | |
6885ffb3 | 1432 | goto drop; |
1da177e4 LT |
1433 | |
1434 | ddp = ddp_hdr(skb); | |
1435 | ||
2a50f28c | 1436 | len_hops = ntohs(ddp->deh_len_hops); |
1da177e4 LT |
1437 | |
1438 | /* Trim buffer in case of stray trailing data */ | |
1439 | origlen = skb->len; | |
2a50f28c | 1440 | skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); |
1da177e4 LT |
1441 | |
1442 | /* | |
1443 | * Size check to see if ddp->deh_len was crap | |
1444 | * (Otherwise we'll detonate most spectacularly | |
75559c16 | 1445 | * in the middle of atalk_checksum() or recvmsg()). |
1da177e4 | 1446 | */ |
75559c16 JD |
1447 | if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { |
1448 | pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " | |
1449 | "skb->len=%u)\n", len_hops & 1023, skb->len); | |
6885ffb3 | 1450 | goto drop; |
75559c16 | 1451 | } |
1da177e4 LT |
1452 | |
1453 | /* | |
1454 | * Any checksums. Note we don't do htons() on this == is assumed to be | |
1455 | * valid for net byte orders all over the networking code... | |
1456 | */ | |
1457 | if (ddp->deh_sum && | |
2a50f28c | 1458 | atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum) |
1da177e4 | 1459 | /* Not a valid AppleTalk frame - dustbin time */ |
6885ffb3 | 1460 | goto drop; |
1da177e4 LT |
1461 | |
1462 | /* Check the packet is aimed at us */ | |
1463 | if (!ddp->deh_dnet) /* Net 0 is 'this network' */ | |
1464 | atif = atalk_find_anynet(ddp->deh_dnode, dev); | |
1465 | else | |
1466 | atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); | |
1467 | ||
1da177e4 | 1468 | if (!atif) { |
64233bff OD |
1469 | /* Not ours, so we route the packet via the correct |
1470 | * AppleTalk iface | |
1471 | */ | |
ffcfb8db | 1472 | return atalk_route_packet(skb, dev, ddp, len_hops, origlen); |
1da177e4 LT |
1473 | } |
1474 | ||
1475 | /* if IP over DDP is not selected this code will be optimized out */ | |
1476 | if (is_ip_over_ddp(skb)) | |
1477 | return handle_ip_over_ddp(skb); | |
1478 | /* | |
1479 | * Which socket - atalk_search_socket() looks for a *full match* | |
1480 | * of the <net, node, port> tuple. | |
1481 | */ | |
1482 | tosat.sat_addr.s_net = ddp->deh_dnet; | |
1483 | tosat.sat_addr.s_node = ddp->deh_dnode; | |
1484 | tosat.sat_port = ddp->deh_dport; | |
1485 | ||
1486 | sock = atalk_search_socket(&tosat, atif); | |
1487 | if (!sock) /* But not one of our sockets */ | |
6885ffb3 | 1488 | goto drop; |
1da177e4 LT |
1489 | |
1490 | /* Queue packet (standard) */ | |
1da177e4 | 1491 | if (sock_queue_rcv_skb(sock, skb) < 0) |
6885ffb3 MS |
1492 | goto drop; |
1493 | ||
1494 | return NET_RX_SUCCESS; | |
1495 | ||
1496 | drop: | |
1da177e4 | 1497 | kfree_skb(skb); |
6885ffb3 MS |
1498 | out: |
1499 | return NET_RX_DROP; | |
1500 | ||
1da177e4 LT |
1501 | } |
1502 | ||
1503 | /* | |
1504 | * Receive a LocalTalk frame. We make some demands on the caller here. | |
1505 | * Caller must provide enough headroom on the packet to pull the short | |
1506 | * header and append a long one. | |
1507 | */ | |
1508 | static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1509 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 | 1510 | { |
721499e8 | 1511 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
1512 | goto freeit; |
1513 | ||
1da177e4 | 1514 | /* Expand any short form frames */ |
98e399f8 | 1515 | if (skb_mac_header(skb)[2] == 1) { |
1da177e4 LT |
1516 | struct ddpehdr *ddp; |
1517 | /* Find our address */ | |
1518 | struct atalk_addr *ap = atalk_find_dev_addr(dev); | |
1519 | ||
2a50f28c | 1520 | if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) |
1da177e4 LT |
1521 | goto freeit; |
1522 | ||
1523 | /* Don't mangle buffer if shared */ | |
ed4477b9 | 1524 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 LT |
1525 | return 0; |
1526 | ||
1527 | /* | |
1528 | * The push leaves us with a ddephdr not an shdr, and | |
1529 | * handily the port bytes in the right place preset. | |
1530 | */ | |
d58ff351 | 1531 | ddp = skb_push(skb, sizeof(*ddp) - 4); |
1da177e4 LT |
1532 | |
1533 | /* Now fill in the long header */ | |
1534 | ||
ed4477b9 YH |
1535 | /* |
1536 | * These two first. The mac overlays the new source/dest | |
1537 | * network information so we MUST copy these before | |
1538 | * we write the network numbers ! | |
1539 | */ | |
1da177e4 | 1540 | |
98e399f8 ACM |
1541 | ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */ |
1542 | ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */ | |
1da177e4 LT |
1543 | |
1544 | ddp->deh_dnet = ap->s_net; /* Network number */ | |
1545 | ddp->deh_snet = ap->s_net; | |
1546 | ddp->deh_sum = 0; /* No checksum */ | |
1547 | /* | |
1548 | * Not sure about this bit... | |
1549 | */ | |
2a50f28c AV |
1550 | /* Non routable, so force a drop if we slip up later */ |
1551 | ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); | |
1da177e4 | 1552 | } |
badff6d0 | 1553 | skb_reset_transport_header(skb); |
1da177e4 | 1554 | |
f2ccd8fa | 1555 | return atalk_rcv(skb, dev, pt, orig_dev); |
1da177e4 LT |
1556 | freeit: |
1557 | kfree_skb(skb); | |
1558 | return 0; | |
1559 | } | |
1560 | ||
1b784140 | 1561 | static int atalk_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
1562 | { |
1563 | struct sock *sk = sock->sk; | |
1564 | struct atalk_sock *at = at_sk(sk); | |
342dfc30 | 1565 | DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name); |
1da177e4 LT |
1566 | int flags = msg->msg_flags; |
1567 | int loopback = 0; | |
1568 | struct sockaddr_at local_satalk, gsat; | |
1569 | struct sk_buff *skb; | |
1570 | struct net_device *dev; | |
1571 | struct ddpehdr *ddp; | |
1572 | int size; | |
1573 | struct atalk_route *rt; | |
1574 | int err; | |
1575 | ||
1576 | if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) | |
1577 | return -EINVAL; | |
1578 | ||
1579 | if (len > DDP_MAXSZ) | |
1580 | return -EMSGSIZE; | |
1581 | ||
60d9f461 | 1582 | lock_sock(sk); |
1da177e4 | 1583 | if (usat) { |
ecced8ba | 1584 | err = -EBUSY; |
1da177e4 LT |
1585 | if (sock_flag(sk, SOCK_ZAPPED)) |
1586 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1587 | goto out; |
1da177e4 | 1588 | |
ecced8ba | 1589 | err = -EINVAL; |
1da177e4 LT |
1590 | if (msg->msg_namelen < sizeof(*usat) || |
1591 | usat->sat_family != AF_APPLETALK) | |
ecced8ba | 1592 | goto out; |
1da177e4 | 1593 | |
ecced8ba | 1594 | err = -EPERM; |
03ba9991 | 1595 | /* netatalk didn't implement this check */ |
1da177e4 LT |
1596 | if (usat->sat_addr.s_node == ATADDR_BCAST && |
1597 | !sock_flag(sk, SOCK_BROADCAST)) { | |
ecced8ba | 1598 | goto out; |
1da177e4 LT |
1599 | } |
1600 | } else { | |
ecced8ba | 1601 | err = -ENOTCONN; |
1da177e4 | 1602 | if (sk->sk_state != TCP_ESTABLISHED) |
ecced8ba | 1603 | goto out; |
1da177e4 LT |
1604 | usat = &local_satalk; |
1605 | usat->sat_family = AF_APPLETALK; | |
1606 | usat->sat_port = at->dest_port; | |
1607 | usat->sat_addr.s_node = at->dest_node; | |
1608 | usat->sat_addr.s_net = at->dest_net; | |
1609 | } | |
1610 | ||
1611 | /* Build a packet */ | |
1612 | SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); | |
1613 | ||
1614 | /* For headers */ | |
1615 | size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; | |
1616 | ||
1617 | if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { | |
1618 | rt = atrtr_find(&usat->sat_addr); | |
1da177e4 LT |
1619 | } else { |
1620 | struct atalk_addr at_hint; | |
1621 | ||
1622 | at_hint.s_node = 0; | |
1623 | at_hint.s_net = at->src_net; | |
1624 | ||
1625 | rt = atrtr_find(&at_hint); | |
1da177e4 | 1626 | } |
48bb230e | 1627 | err = -ENETUNREACH; |
64233bff | 1628 | if (!rt) |
ecced8ba | 1629 | goto out; |
64233bff OD |
1630 | |
1631 | dev = rt->dev; | |
1da177e4 LT |
1632 | |
1633 | SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", | |
1634 | sk, size, dev->name); | |
1635 | ||
1636 | size += dev->hard_header_len; | |
60d9f461 | 1637 | release_sock(sk); |
1da177e4 | 1638 | skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); |
60d9f461 | 1639 | lock_sock(sk); |
1da177e4 | 1640 | if (!skb) |
ecced8ba | 1641 | goto out; |
ed4477b9 | 1642 | |
1da177e4 LT |
1643 | skb_reserve(skb, ddp_dl->header_length); |
1644 | skb_reserve(skb, dev->hard_header_len); | |
1645 | skb->dev = dev; | |
1646 | ||
1647 | SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); | |
1648 | ||
4df864c1 | 1649 | ddp = skb_put(skb, sizeof(struct ddpehdr)); |
2a50f28c | 1650 | ddp->deh_len_hops = htons(len + sizeof(*ddp)); |
1da177e4 LT |
1651 | ddp->deh_dnet = usat->sat_addr.s_net; |
1652 | ddp->deh_snet = at->src_net; | |
1653 | ddp->deh_dnode = usat->sat_addr.s_node; | |
1654 | ddp->deh_snode = at->src_node; | |
1655 | ddp->deh_dport = usat->sat_port; | |
1656 | ddp->deh_sport = at->src_port; | |
1657 | ||
5b5e0928 | 1658 | SOCK_DEBUG(sk, "SK %p: Copy user data (%zd bytes).\n", sk, len); |
1da177e4 | 1659 | |
6ce8e9ce | 1660 | err = memcpy_from_msg(skb_put(skb, len), msg, len); |
1da177e4 LT |
1661 | if (err) { |
1662 | kfree_skb(skb); | |
ecced8ba AB |
1663 | err = -EFAULT; |
1664 | goto out; | |
1da177e4 LT |
1665 | } |
1666 | ||
28448b80 | 1667 | if (sk->sk_no_check_tx) |
1da177e4 LT |
1668 | ddp->deh_sum = 0; |
1669 | else | |
1670 | ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); | |
1671 | ||
1672 | /* | |
1673 | * Loopback broadcast packets to non gateway targets (ie routes | |
1674 | * to group we are in) | |
1675 | */ | |
1676 | if (ddp->deh_dnode == ATADDR_BCAST && | |
1677 | !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { | |
1678 | struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); | |
1679 | ||
1680 | if (skb2) { | |
1681 | loopback = 1; | |
1682 | SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); | |
ffcfb8db ACM |
1683 | /* |
1684 | * If it fails it is queued/sent above in the aarp queue | |
1685 | */ | |
1686 | aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL); | |
1da177e4 LT |
1687 | } |
1688 | } | |
1689 | ||
1690 | if (dev->flags & IFF_LOOPBACK || loopback) { | |
1691 | SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); | |
1692 | /* loop back */ | |
1693 | skb_orphan(skb); | |
64233bff OD |
1694 | if (ddp->deh_dnode == ATADDR_BCAST) { |
1695 | struct atalk_addr at_lo; | |
1696 | ||
1697 | at_lo.s_node = 0; | |
1698 | at_lo.s_net = 0; | |
1699 | ||
1700 | rt = atrtr_find(&at_lo); | |
1701 | if (!rt) { | |
1702 | kfree_skb(skb); | |
ecced8ba AB |
1703 | err = -ENETUNREACH; |
1704 | goto out; | |
64233bff OD |
1705 | } |
1706 | dev = rt->dev; | |
1707 | skb->dev = dev; | |
1708 | } | |
1da177e4 LT |
1709 | ddp_dl->request(ddp_dl, skb, dev->dev_addr); |
1710 | } else { | |
1711 | SOCK_DEBUG(sk, "SK %p: send out.\n", sk); | |
1712 | if (rt->flags & RTF_GATEWAY) { | |
1713 | gsat.sat_addr = rt->gateway; | |
1714 | usat = &gsat; | |
1715 | } | |
1716 | ||
ffcfb8db ACM |
1717 | /* |
1718 | * If it fails it is queued/sent above in the aarp queue | |
1719 | */ | |
1720 | aarp_send_ddp(dev, skb, &usat->sat_addr, NULL); | |
1da177e4 | 1721 | } |
5b5e0928 | 1722 | SOCK_DEBUG(sk, "SK %p: Done write (%zd).\n", sk, len); |
1da177e4 | 1723 | |
ecced8ba | 1724 | out: |
60d9f461 | 1725 | release_sock(sk); |
ecced8ba | 1726 | return err ? : len; |
1da177e4 LT |
1727 | } |
1728 | ||
1b784140 YX |
1729 | static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1730 | int flags) | |
1da177e4 LT |
1731 | { |
1732 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1733 | struct ddpehdr *ddp; |
1734 | int copied = 0; | |
2a50f28c | 1735 | int offset = 0; |
1da177e4 | 1736 | int err = 0; |
ecced8ba AB |
1737 | struct sk_buff *skb; |
1738 | ||
ecced8ba | 1739 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
1da177e4 | 1740 | flags & MSG_DONTWAIT, &err); |
60d9f461 AB |
1741 | lock_sock(sk); |
1742 | ||
1da177e4 | 1743 | if (!skb) |
ecced8ba | 1744 | goto out; |
1da177e4 LT |
1745 | |
1746 | /* FIXME: use skb->cb to be able to use shared skbs */ | |
1747 | ddp = ddp_hdr(skb); | |
2a50f28c | 1748 | copied = ntohs(ddp->deh_len_hops) & 1023; |
1da177e4 | 1749 | |
2a50f28c AV |
1750 | if (sk->sk_type != SOCK_RAW) { |
1751 | offset = sizeof(*ddp); | |
1752 | copied -= offset; | |
1753 | } | |
1da177e4 | 1754 | |
2a50f28c AV |
1755 | if (copied > size) { |
1756 | copied = size; | |
1757 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 | 1758 | } |
51f3d02b | 1759 | err = skb_copy_datagram_msg(skb, offset, msg, copied); |
1da177e4 | 1760 | |
f3d33426 | 1761 | if (!err && msg->msg_name) { |
342dfc30 | 1762 | DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name); |
f3d33426 HFS |
1763 | sat->sat_family = AF_APPLETALK; |
1764 | sat->sat_port = ddp->deh_sport; | |
1765 | sat->sat_addr.s_node = ddp->deh_snode; | |
1766 | sat->sat_addr.s_net = ddp->deh_snet; | |
1767 | msg->msg_namelen = sizeof(*sat); | |
1da177e4 LT |
1768 | } |
1769 | ||
1770 | skb_free_datagram(sk, skb); /* Free the datagram. */ | |
ecced8ba AB |
1771 | |
1772 | out: | |
60d9f461 | 1773 | release_sock(sk); |
1da177e4 LT |
1774 | return err ? : copied; |
1775 | } | |
1776 | ||
1777 | ||
1778 | /* | |
1779 | * AppleTalk ioctl calls. | |
1780 | */ | |
1781 | static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1782 | { | |
b5e5fa5e | 1783 | int rc = -ENOIOCTLCMD; |
1da177e4 LT |
1784 | struct sock *sk = sock->sk; |
1785 | void __user *argp = (void __user *)arg; | |
1786 | ||
1787 | switch (cmd) { | |
7b30600c | 1788 | /* Protocol layer */ |
1789 | case TIOCOUTQ: { | |
1790 | long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
1da177e4 | 1791 | |
7b30600c | 1792 | if (amount < 0) |
1793 | amount = 0; | |
1794 | rc = put_user(amount, (int __user *)argp); | |
1795 | break; | |
1796 | } | |
1797 | case TIOCINQ: { | |
1798 | /* | |
1799 | * These two are safe on a single CPU system as only | |
1800 | * user tasks fiddle here | |
1801 | */ | |
1802 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); | |
1803 | long amount = 0; | |
1da177e4 | 1804 | |
7b30600c | 1805 | if (skb) |
63ae8894 | 1806 | amount = skb->len - sizeof(struct ddpehdr); |
7b30600c | 1807 | rc = put_user(amount, (int __user *)argp); |
1808 | break; | |
1809 | } | |
1810 | case SIOCGSTAMP: | |
1811 | rc = sock_get_timestamp(sk, argp); | |
1812 | break; | |
1813 | case SIOCGSTAMPNS: | |
1814 | rc = sock_get_timestampns(sk, argp); | |
1815 | break; | |
1816 | /* Routing */ | |
1817 | case SIOCADDRT: | |
1818 | case SIOCDELRT: | |
1819 | rc = -EPERM; | |
1820 | if (capable(CAP_NET_ADMIN)) | |
1821 | rc = atrtr_ioctl(cmd, argp); | |
1822 | break; | |
1823 | /* Interface */ | |
1824 | case SIOCGIFADDR: | |
1825 | case SIOCSIFADDR: | |
1826 | case SIOCGIFBRDADDR: | |
1827 | case SIOCATALKDIFADDR: | |
1828 | case SIOCDIFADDR: | |
1829 | case SIOCSARP: /* proxy AARP */ | |
1830 | case SIOCDARP: /* proxy AARP */ | |
1831 | rtnl_lock(); | |
1832 | rc = atif_ioctl(cmd, argp); | |
1833 | rtnl_unlock(); | |
1834 | break; | |
1da177e4 LT |
1835 | } |
1836 | ||
1837 | return rc; | |
1838 | } | |
1839 | ||
f6c90b71 PV |
1840 | |
1841 | #ifdef CONFIG_COMPAT | |
1842 | static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1843 | { | |
1844 | /* | |
20660221 AB |
1845 | * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we |
1846 | * cannot handle it in common code. The data we access if ifreq | |
1847 | * here is compatible, so we can simply call the native | |
1848 | * handler. | |
f6c90b71 | 1849 | */ |
20660221 AB |
1850 | if (cmd == SIOCATALKDIFADDR) |
1851 | return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg)); | |
1852 | ||
f6c90b71 PV |
1853 | return -ENOIOCTLCMD; |
1854 | } | |
1855 | #endif | |
1856 | ||
1857 | ||
ec1b4cf7 | 1858 | static const struct net_proto_family atalk_family_ops = { |
1da177e4 LT |
1859 | .family = PF_APPLETALK, |
1860 | .create = atalk_create, | |
1861 | .owner = THIS_MODULE, | |
1862 | }; | |
1863 | ||
ecced8ba | 1864 | static const struct proto_ops atalk_dgram_ops = { |
1da177e4 LT |
1865 | .family = PF_APPLETALK, |
1866 | .owner = THIS_MODULE, | |
1867 | .release = atalk_release, | |
1868 | .bind = atalk_bind, | |
1869 | .connect = atalk_connect, | |
1870 | .socketpair = sock_no_socketpair, | |
1871 | .accept = sock_no_accept, | |
1872 | .getname = atalk_getname, | |
60d9f461 | 1873 | .poll = datagram_poll, |
1da177e4 | 1874 | .ioctl = atalk_ioctl, |
f6c90b71 PV |
1875 | #ifdef CONFIG_COMPAT |
1876 | .compat_ioctl = atalk_compat_ioctl, | |
1877 | #endif | |
1da177e4 LT |
1878 | .listen = sock_no_listen, |
1879 | .shutdown = sock_no_shutdown, | |
1880 | .setsockopt = sock_no_setsockopt, | |
1881 | .getsockopt = sock_no_getsockopt, | |
1882 | .sendmsg = atalk_sendmsg, | |
1883 | .recvmsg = atalk_recvmsg, | |
1884 | .mmap = sock_no_mmap, | |
1885 | .sendpage = sock_no_sendpage, | |
1886 | }; | |
1887 | ||
1da177e4 LT |
1888 | static struct notifier_block ddp_notifier = { |
1889 | .notifier_call = ddp_device_event, | |
1890 | }; | |
1891 | ||
7546dd97 | 1892 | static struct packet_type ltalk_packet_type __read_mostly = { |
09640e63 | 1893 | .type = cpu_to_be16(ETH_P_LOCALTALK), |
1da177e4 LT |
1894 | .func = ltalk_rcv, |
1895 | }; | |
1896 | ||
7546dd97 | 1897 | static struct packet_type ppptalk_packet_type __read_mostly = { |
09640e63 | 1898 | .type = cpu_to_be16(ETH_P_PPPTALK), |
1da177e4 LT |
1899 | .func = atalk_rcv, |
1900 | }; | |
1901 | ||
1902 | static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; | |
1903 | ||
1904 | /* Export symbols for use by drivers when AppleTalk is a module */ | |
1da177e4 LT |
1905 | EXPORT_SYMBOL(atrtr_get_dev); |
1906 | EXPORT_SYMBOL(atalk_find_dev_addr); | |
1907 | ||
2db09608 | 1908 | static const char atalk_err_snap[] __initconst = |
1da177e4 LT |
1909 | KERN_CRIT "Unable to register DDP with SNAP.\n"; |
1910 | ||
1911 | /* Called by proto.c on kernel start up */ | |
1912 | static int __init atalk_init(void) | |
1913 | { | |
1914 | int rc = proto_register(&ddp_proto, 0); | |
1915 | ||
1916 | if (rc != 0) | |
1917 | goto out; | |
1918 | ||
1919 | (void)sock_register(&atalk_family_ops); | |
1920 | ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); | |
1921 | if (!ddp_dl) | |
1922 | printk(atalk_err_snap); | |
1923 | ||
1924 | dev_add_pack(<alk_packet_type); | |
1925 | dev_add_pack(&ppptalk_packet_type); | |
1926 | ||
1927 | register_netdevice_notifier(&ddp_notifier); | |
1928 | aarp_proto_init(); | |
1929 | atalk_proc_init(); | |
1930 | atalk_register_sysctl(); | |
1931 | out: | |
1932 | return rc; | |
1933 | } | |
1934 | module_init(atalk_init); | |
1935 | ||
1936 | /* | |
1937 | * No explicit module reference count manipulation is needed in the | |
1938 | * protocol. Socket layer sets module reference count for us | |
1939 | * and interfaces reference counting is done | |
1940 | * by the network device layer. | |
1941 | * | |
1942 | * Ergo, before the AppleTalk module can be removed, all AppleTalk | |
1943 | * sockets be closed from user space. | |
1944 | */ | |
1945 | static void __exit atalk_exit(void) | |
1946 | { | |
1947 | #ifdef CONFIG_SYSCTL | |
1948 | atalk_unregister_sysctl(); | |
1949 | #endif /* CONFIG_SYSCTL */ | |
1950 | atalk_proc_exit(); | |
1951 | aarp_cleanup_module(); /* General aarp clean-up. */ | |
1952 | unregister_netdevice_notifier(&ddp_notifier); | |
1953 | dev_remove_pack(<alk_packet_type); | |
1954 | dev_remove_pack(&ppptalk_packet_type); | |
1955 | unregister_snap_client(ddp_dl); | |
1956 | sock_unregister(PF_APPLETALK); | |
1957 | proto_unregister(&ddp_proto); | |
1958 | } | |
1959 | module_exit(atalk_exit); | |
1960 | ||
1961 | MODULE_LICENSE("GPL"); | |
113aa838 | 1962 | MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>"); |
1da177e4 LT |
1963 | MODULE_DESCRIPTION("AppleTalk 0.20\n"); |
1964 | MODULE_ALIAS_NETPROTO(PF_APPLETALK); |