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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * DDP: An implementation of the AppleTalk DDP protocol for | |
4 | * Ethernet 'ELAP'. | |
5 | * | |
113aa838 | 6 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
7 | * |
8 | * With more than a little assistance from | |
9 | * | |
10 | * Wesley Craig <netatalk@umich.edu> | |
11 | * | |
12 | * Fixes: | |
13 | * Neil Horman : Added missing device ioctls | |
14 | * Michael Callahan : Made routing work | |
15 | * Wesley Craig : Fix probing to listen to a | |
16 | * passed node id. | |
17 | * Alan Cox : Added send/recvmsg support | |
18 | * Alan Cox : Moved at. to protinfo in | |
19 | * socket. | |
20 | * Alan Cox : Added firewall hooks. | |
21 | * Alan Cox : Supports new ARPHRD_LOOPBACK | |
22 | * Christer Weinigel : Routing and /proc fixes. | |
23 | * Bradford Johnson : LocalTalk. | |
24 | * Tom Dyas : Module support. | |
25 | * Alan Cox : Hooks for PPP (based on the | |
26 | * LocalTalk hook). | |
27 | * Alan Cox : Posix bits | |
28 | * Alan Cox/Mike Freeman : Possible fix to NBP problems | |
29 | * Bradford Johnson : IP-over-DDP (experimental) | |
30 | * Jay Schulist : Moved IP-over-DDP to its own | |
31 | * driver file. (ipddp.c & ipddp.h) | |
ed4477b9 | 32 | * Jay Schulist : Made work as module with |
1da177e4 LT |
33 | * AppleTalk drivers, cleaned it. |
34 | * Rob Newberry : Added proxy AARP and AARP | |
35 | * procfs, moved probing to AARP | |
36 | * module. | |
ed4477b9 YH |
37 | * Adrian Sun/ |
38 | * Michael Zuelsdorff : fix for net.0 packets. don't | |
1da177e4 | 39 | * allow illegal ether/tokentalk |
ed4477b9 YH |
40 | * port assignment. we lose a |
41 | * valid localtalk port as a | |
1da177e4 LT |
42 | * result. |
43 | * Arnaldo C. de Melo : Cleanup, in preparation for | |
44 | * shared skb support 8) | |
45 | * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c, | |
46 | * use seq_file | |
1da177e4 LT |
47 | */ |
48 | ||
4fc268d2 | 49 | #include <linux/capability.h> |
1da177e4 | 50 | #include <linux/module.h> |
1da177e4 LT |
51 | #include <linux/if_arp.h> |
52 | #include <linux/termios.h> /* For TIOCOUTQ/INQ */ | |
415ce61a | 53 | #include <linux/compat.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
1da177e4 LT |
55 | #include <net/datalink.h> |
56 | #include <net/psnap.h> | |
57 | #include <net/sock.h> | |
c752f073 | 58 | #include <net/tcp_states.h> |
1da177e4 | 59 | #include <net/route.h> |
dc13c876 | 60 | #include <net/compat.h> |
1da177e4 | 61 | #include <linux/atalk.h> |
51c56b00 | 62 | #include <linux/highmem.h> |
1da177e4 LT |
63 | |
64 | struct datalink_proto *ddp_dl, *aarp_dl; | |
90ddc4f0 | 65 | static const struct proto_ops atalk_dgram_ops; |
1da177e4 LT |
66 | |
67 | /**************************************************************************\ | |
68 | * * | |
69 | * Handlers for the socket list. * | |
70 | * * | |
71 | \**************************************************************************/ | |
72 | ||
73 | HLIST_HEAD(atalk_sockets); | |
74 | DEFINE_RWLOCK(atalk_sockets_lock); | |
75 | ||
76 | static inline void __atalk_insert_socket(struct sock *sk) | |
77 | { | |
78 | sk_add_node(sk, &atalk_sockets); | |
79 | } | |
80 | ||
81 | static inline void atalk_remove_socket(struct sock *sk) | |
82 | { | |
83 | write_lock_bh(&atalk_sockets_lock); | |
84 | sk_del_node_init(sk); | |
85 | write_unlock_bh(&atalk_sockets_lock); | |
86 | } | |
87 | ||
88 | static struct sock *atalk_search_socket(struct sockaddr_at *to, | |
89 | struct atalk_iface *atif) | |
90 | { | |
91 | struct sock *s; | |
1da177e4 LT |
92 | |
93 | read_lock_bh(&atalk_sockets_lock); | |
b67bfe0d | 94 | sk_for_each(s, &atalk_sockets) { |
1da177e4 LT |
95 | struct atalk_sock *at = at_sk(s); |
96 | ||
97 | if (to->sat_port != at->src_port) | |
98 | continue; | |
99 | ||
ed4477b9 | 100 | if (to->sat_addr.s_net == ATADDR_ANYNET && |
64233bff | 101 | to->sat_addr.s_node == ATADDR_BCAST) |
1da177e4 LT |
102 | goto found; |
103 | ||
ed4477b9 | 104 | if (to->sat_addr.s_net == at->src_net && |
1da177e4 LT |
105 | (to->sat_addr.s_node == at->src_node || |
106 | to->sat_addr.s_node == ATADDR_BCAST || | |
107 | to->sat_addr.s_node == ATADDR_ANYNODE)) | |
108 | goto found; | |
109 | ||
ed4477b9 | 110 | /* XXXX.0 -- we got a request for this router. make sure |
1da177e4 LT |
111 | * that the node is appropriately set. */ |
112 | if (to->sat_addr.s_node == ATADDR_ANYNODE && | |
113 | to->sat_addr.s_net != ATADDR_ANYNET && | |
114 | atif->address.s_node == at->src_node) { | |
115 | to->sat_addr.s_node = atif->address.s_node; | |
116 | goto found; | |
117 | } | |
118 | } | |
119 | s = NULL; | |
120 | found: | |
121 | read_unlock_bh(&atalk_sockets_lock); | |
122 | return s; | |
123 | } | |
124 | ||
125 | /** | |
126 | * atalk_find_or_insert_socket - Try to find a socket matching ADDR | |
2c53040f BH |
127 | * @sk: socket to insert in the list if it is not there already |
128 | * @sat: address to search for | |
1da177e4 LT |
129 | * |
130 | * Try to find a socket matching ADDR in the socket list, if found then return | |
131 | * it. If not, insert SK into the socket list. | |
132 | * | |
133 | * This entire operation must execute atomically. | |
134 | */ | |
135 | static struct sock *atalk_find_or_insert_socket(struct sock *sk, | |
136 | struct sockaddr_at *sat) | |
137 | { | |
138 | struct sock *s; | |
1da177e4 LT |
139 | struct atalk_sock *at; |
140 | ||
141 | write_lock_bh(&atalk_sockets_lock); | |
b67bfe0d | 142 | sk_for_each(s, &atalk_sockets) { |
1da177e4 LT |
143 | at = at_sk(s); |
144 | ||
145 | if (at->src_net == sat->sat_addr.s_net && | |
146 | at->src_node == sat->sat_addr.s_node && | |
147 | at->src_port == sat->sat_port) | |
148 | goto found; | |
149 | } | |
150 | s = NULL; | |
151 | __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */ | |
152 | found: | |
153 | write_unlock_bh(&atalk_sockets_lock); | |
154 | return s; | |
155 | } | |
156 | ||
e99e88a9 | 157 | static void atalk_destroy_timer(struct timer_list *t) |
1da177e4 | 158 | { |
e99e88a9 | 159 | struct sock *sk = from_timer(sk, t, sk_timer); |
1da177e4 | 160 | |
c564039f | 161 | if (sk_has_allocations(sk)) { |
1da177e4 LT |
162 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
163 | add_timer(&sk->sk_timer); | |
164 | } else | |
165 | sock_put(sk); | |
166 | } | |
167 | ||
168 | static inline void atalk_destroy_socket(struct sock *sk) | |
169 | { | |
170 | atalk_remove_socket(sk); | |
171 | skb_queue_purge(&sk->sk_receive_queue); | |
172 | ||
c564039f | 173 | if (sk_has_allocations(sk)) { |
e99e88a9 | 174 | timer_setup(&sk->sk_timer, atalk_destroy_timer, 0); |
1da177e4 | 175 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
1da177e4 LT |
176 | add_timer(&sk->sk_timer); |
177 | } else | |
178 | sock_put(sk); | |
179 | } | |
180 | ||
181 | /**************************************************************************\ | |
182 | * * | |
183 | * Routing tables for the AppleTalk socket layer. * | |
184 | * * | |
185 | \**************************************************************************/ | |
186 | ||
187 | /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ | |
188 | struct atalk_route *atalk_routes; | |
189 | DEFINE_RWLOCK(atalk_routes_lock); | |
190 | ||
191 | struct atalk_iface *atalk_interfaces; | |
192 | DEFINE_RWLOCK(atalk_interfaces_lock); | |
193 | ||
194 | /* For probing devices or in a routerless network */ | |
195 | struct atalk_route atrtr_default; | |
196 | ||
197 | /* AppleTalk interface control */ | |
198 | /* | |
199 | * Drop a device. Doesn't drop any of its routes - that is the caller's | |
200 | * problem. Called when we down the interface or delete the address. | |
201 | */ | |
202 | static void atif_drop_device(struct net_device *dev) | |
203 | { | |
204 | struct atalk_iface **iface = &atalk_interfaces; | |
205 | struct atalk_iface *tmp; | |
206 | ||
207 | write_lock_bh(&atalk_interfaces_lock); | |
208 | while ((tmp = *iface) != NULL) { | |
209 | if (tmp->dev == dev) { | |
210 | *iface = tmp->next; | |
211 | dev_put(dev); | |
212 | kfree(tmp); | |
213 | dev->atalk_ptr = NULL; | |
214 | } else | |
215 | iface = &tmp->next; | |
216 | } | |
217 | write_unlock_bh(&atalk_interfaces_lock); | |
218 | } | |
219 | ||
220 | static struct atalk_iface *atif_add_device(struct net_device *dev, | |
221 | struct atalk_addr *sa) | |
222 | { | |
0da974f4 | 223 | struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); |
1da177e4 LT |
224 | |
225 | if (!iface) | |
226 | goto out; | |
227 | ||
1da177e4 LT |
228 | dev_hold(dev); |
229 | iface->dev = dev; | |
230 | dev->atalk_ptr = iface; | |
231 | iface->address = *sa; | |
232 | iface->status = 0; | |
233 | ||
234 | write_lock_bh(&atalk_interfaces_lock); | |
235 | iface->next = atalk_interfaces; | |
236 | atalk_interfaces = iface; | |
237 | write_unlock_bh(&atalk_interfaces_lock); | |
238 | out: | |
239 | return iface; | |
240 | } | |
241 | ||
242 | /* Perform phase 2 AARP probing on our tentative address */ | |
243 | static int atif_probe_device(struct atalk_iface *atif) | |
244 | { | |
245 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
246 | ntohs(atif->nets.nr_firstnet) + 1; | |
247 | int probe_net = ntohs(atif->address.s_net); | |
248 | int probe_node = atif->address.s_node; | |
249 | int netct, nodect; | |
250 | ||
251 | /* Offset the network we start probing with */ | |
252 | if (probe_net == ATADDR_ANYNET) { | |
253 | probe_net = ntohs(atif->nets.nr_firstnet); | |
254 | if (netrange) | |
255 | probe_net += jiffies % netrange; | |
256 | } | |
257 | if (probe_node == ATADDR_ANYNODE) | |
258 | probe_node = jiffies & 0xFF; | |
259 | ||
260 | /* Scan the networks */ | |
261 | atif->status |= ATIF_PROBE; | |
262 | for (netct = 0; netct <= netrange; netct++) { | |
263 | /* Sweep the available nodes from a given start */ | |
264 | atif->address.s_net = htons(probe_net); | |
265 | for (nodect = 0; nodect < 256; nodect++) { | |
266 | atif->address.s_node = (nodect + probe_node) & 0xFF; | |
267 | if (atif->address.s_node > 0 && | |
268 | atif->address.s_node < 254) { | |
269 | /* Probe a proposed address */ | |
270 | aarp_probe_network(atif); | |
271 | ||
272 | if (!(atif->status & ATIF_PROBE_FAIL)) { | |
273 | atif->status &= ~ATIF_PROBE; | |
274 | return 0; | |
275 | } | |
276 | } | |
277 | atif->status &= ~ATIF_PROBE_FAIL; | |
278 | } | |
279 | probe_net++; | |
280 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
281 | probe_net = ntohs(atif->nets.nr_firstnet); | |
282 | } | |
283 | atif->status &= ~ATIF_PROBE; | |
284 | ||
285 | return -EADDRINUSE; /* Network is full... */ | |
286 | } | |
287 | ||
288 | ||
289 | /* Perform AARP probing for a proxy address */ | |
290 | static int atif_proxy_probe_device(struct atalk_iface *atif, | |
6f0984a0 | 291 | struct atalk_addr *proxy_addr) |
1da177e4 LT |
292 | { |
293 | int netrange = ntohs(atif->nets.nr_lastnet) - | |
294 | ntohs(atif->nets.nr_firstnet) + 1; | |
295 | /* we probe the interface's network */ | |
296 | int probe_net = ntohs(atif->address.s_net); | |
297 | int probe_node = ATADDR_ANYNODE; /* we'll take anything */ | |
298 | int netct, nodect; | |
299 | ||
300 | /* Offset the network we start probing with */ | |
301 | if (probe_net == ATADDR_ANYNET) { | |
302 | probe_net = ntohs(atif->nets.nr_firstnet); | |
303 | if (netrange) | |
304 | probe_net += jiffies % netrange; | |
305 | } | |
306 | ||
307 | if (probe_node == ATADDR_ANYNODE) | |
308 | probe_node = jiffies & 0xFF; | |
ed4477b9 | 309 | |
1da177e4 LT |
310 | /* Scan the networks */ |
311 | for (netct = 0; netct <= netrange; netct++) { | |
312 | /* Sweep the available nodes from a given start */ | |
313 | proxy_addr->s_net = htons(probe_net); | |
314 | for (nodect = 0; nodect < 256; nodect++) { | |
315 | proxy_addr->s_node = (nodect + probe_node) & 0xFF; | |
316 | if (proxy_addr->s_node > 0 && | |
317 | proxy_addr->s_node < 254) { | |
318 | /* Tell AARP to probe a proposed address */ | |
319 | int ret = aarp_proxy_probe_network(atif, | |
320 | proxy_addr); | |
321 | ||
322 | if (ret != -EADDRINUSE) | |
323 | return ret; | |
324 | } | |
325 | } | |
326 | probe_net++; | |
327 | if (probe_net > ntohs(atif->nets.nr_lastnet)) | |
328 | probe_net = ntohs(atif->nets.nr_firstnet); | |
329 | } | |
330 | ||
331 | return -EADDRINUSE; /* Network is full... */ | |
332 | } | |
333 | ||
334 | ||
335 | struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) | |
336 | { | |
337 | struct atalk_iface *iface = dev->atalk_ptr; | |
338 | return iface ? &iface->address : NULL; | |
339 | } | |
340 | ||
341 | static struct atalk_addr *atalk_find_primary(void) | |
342 | { | |
343 | struct atalk_iface *fiface = NULL; | |
344 | struct atalk_addr *retval; | |
345 | struct atalk_iface *iface; | |
346 | ||
347 | /* | |
348 | * Return a point-to-point interface only if | |
349 | * there is no non-ptp interface available. | |
350 | */ | |
351 | read_lock_bh(&atalk_interfaces_lock); | |
352 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
353 | if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) | |
354 | fiface = iface; | |
355 | if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { | |
356 | retval = &iface->address; | |
357 | goto out; | |
358 | } | |
359 | } | |
360 | ||
361 | if (fiface) | |
362 | retval = &fiface->address; | |
363 | else if (atalk_interfaces) | |
364 | retval = &atalk_interfaces->address; | |
365 | else | |
366 | retval = NULL; | |
367 | out: | |
368 | read_unlock_bh(&atalk_interfaces_lock); | |
369 | return retval; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Find a match for 'any network' - ie any of our interfaces with that | |
374 | * node number will do just nicely. | |
375 | */ | |
376 | static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) | |
377 | { | |
378 | struct atalk_iface *iface = dev->atalk_ptr; | |
379 | ||
380 | if (!iface || iface->status & ATIF_PROBE) | |
381 | goto out_err; | |
382 | ||
383 | if (node != ATADDR_BCAST && | |
384 | iface->address.s_node != node && | |
385 | node != ATADDR_ANYNODE) | |
386 | goto out_err; | |
387 | out: | |
388 | return iface; | |
389 | out_err: | |
390 | iface = NULL; | |
391 | goto out; | |
392 | } | |
393 | ||
394 | /* Find a match for a specific network:node pair */ | |
f6e276ee | 395 | static struct atalk_iface *atalk_find_interface(__be16 net, int node) |
1da177e4 LT |
396 | { |
397 | struct atalk_iface *iface; | |
398 | ||
399 | read_lock_bh(&atalk_interfaces_lock); | |
400 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
401 | if ((node == ATADDR_BCAST || | |
402 | node == ATADDR_ANYNODE || | |
403 | iface->address.s_node == node) && | |
404 | iface->address.s_net == net && | |
405 | !(iface->status & ATIF_PROBE)) | |
406 | break; | |
407 | ||
408 | /* XXXX.0 -- net.0 returns the iface associated with net */ | |
409 | if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && | |
410 | ntohs(iface->nets.nr_firstnet) <= ntohs(net) && | |
411 | ntohs(net) <= ntohs(iface->nets.nr_lastnet)) | |
ed4477b9 | 412 | break; |
1da177e4 LT |
413 | } |
414 | read_unlock_bh(&atalk_interfaces_lock); | |
415 | return iface; | |
416 | } | |
417 | ||
418 | ||
419 | /* | |
420 | * Find a route for an AppleTalk packet. This ought to get cached in | |
421 | * the socket (later on...). We know about host routes and the fact | |
422 | * that a route must be direct to broadcast. | |
423 | */ | |
424 | static struct atalk_route *atrtr_find(struct atalk_addr *target) | |
425 | { | |
426 | /* | |
ed4477b9 | 427 | * we must search through all routes unless we find a |
1da177e4 LT |
428 | * host route, because some host routes might overlap |
429 | * network routes | |
430 | */ | |
431 | struct atalk_route *net_route = NULL; | |
432 | struct atalk_route *r; | |
ed4477b9 | 433 | |
1da177e4 LT |
434 | read_lock_bh(&atalk_routes_lock); |
435 | for (r = atalk_routes; r; r = r->next) { | |
436 | if (!(r->flags & RTF_UP)) | |
437 | continue; | |
438 | ||
439 | if (r->target.s_net == target->s_net) { | |
440 | if (r->flags & RTF_HOST) { | |
441 | /* | |
442 | * if this host route is for the target, | |
443 | * the we're done | |
444 | */ | |
445 | if (r->target.s_node == target->s_node) | |
446 | goto out; | |
447 | } else | |
448 | /* | |
449 | * this route will work if there isn't a | |
450 | * direct host route, so cache it | |
451 | */ | |
452 | net_route = r; | |
453 | } | |
454 | } | |
ed4477b9 YH |
455 | |
456 | /* | |
1da177e4 LT |
457 | * if we found a network route but not a direct host |
458 | * route, then return it | |
459 | */ | |
460 | if (net_route) | |
461 | r = net_route; | |
462 | else if (atrtr_default.dev) | |
463 | r = &atrtr_default; | |
464 | else /* No route can be found */ | |
465 | r = NULL; | |
466 | out: | |
467 | read_unlock_bh(&atalk_routes_lock); | |
468 | return r; | |
469 | } | |
470 | ||
471 | ||
472 | /* | |
473 | * Given an AppleTalk network, find the device to use. This can be | |
474 | * a simple lookup. | |
475 | */ | |
476 | struct net_device *atrtr_get_dev(struct atalk_addr *sa) | |
477 | { | |
478 | struct atalk_route *atr = atrtr_find(sa); | |
479 | return atr ? atr->dev : NULL; | |
480 | } | |
481 | ||
482 | /* Set up a default router */ | |
483 | static void atrtr_set_default(struct net_device *dev) | |
484 | { | |
485 | atrtr_default.dev = dev; | |
486 | atrtr_default.flags = RTF_UP; | |
487 | atrtr_default.gateway.s_net = htons(0); | |
488 | atrtr_default.gateway.s_node = 0; | |
489 | } | |
490 | ||
491 | /* | |
492 | * Add a router. Basically make sure it looks valid and stuff the | |
493 | * entry in the list. While it uses netranges we always set them to one | |
494 | * entry to work like netatalk. | |
495 | */ | |
496 | static int atrtr_create(struct rtentry *r, struct net_device *devhint) | |
497 | { | |
498 | struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; | |
499 | struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; | |
500 | struct atalk_route *rt; | |
501 | struct atalk_iface *iface, *riface; | |
502 | int retval = -EINVAL; | |
503 | ||
504 | /* | |
505 | * Fixme: Raise/Lower a routing change semaphore for these | |
506 | * operations. | |
507 | */ | |
508 | ||
509 | /* Validate the request */ | |
510 | if (ta->sat_family != AF_APPLETALK || | |
511 | (!devhint && ga->sat_family != AF_APPLETALK)) | |
512 | goto out; | |
513 | ||
514 | /* Now walk the routing table and make our decisions */ | |
515 | write_lock_bh(&atalk_routes_lock); | |
516 | for (rt = atalk_routes; rt; rt = rt->next) { | |
517 | if (r->rt_flags != rt->flags) | |
518 | continue; | |
519 | ||
520 | if (ta->sat_addr.s_net == rt->target.s_net) { | |
521 | if (!(rt->flags & RTF_HOST)) | |
522 | break; | |
523 | if (ta->sat_addr.s_node == rt->target.s_node) | |
524 | break; | |
525 | } | |
526 | } | |
527 | ||
528 | if (!devhint) { | |
529 | riface = NULL; | |
530 | ||
531 | read_lock_bh(&atalk_interfaces_lock); | |
532 | for (iface = atalk_interfaces; iface; iface = iface->next) { | |
533 | if (!riface && | |
534 | ntohs(ga->sat_addr.s_net) >= | |
ed4477b9 | 535 | ntohs(iface->nets.nr_firstnet) && |
1da177e4 | 536 | ntohs(ga->sat_addr.s_net) <= |
ed4477b9 | 537 | ntohs(iface->nets.nr_lastnet)) |
1da177e4 LT |
538 | riface = iface; |
539 | ||
540 | if (ga->sat_addr.s_net == iface->address.s_net && | |
541 | ga->sat_addr.s_node == iface->address.s_node) | |
542 | riface = iface; | |
ed4477b9 | 543 | } |
1da177e4 LT |
544 | read_unlock_bh(&atalk_interfaces_lock); |
545 | ||
546 | retval = -ENETUNREACH; | |
547 | if (!riface) | |
548 | goto out_unlock; | |
549 | ||
550 | devhint = riface->dev; | |
551 | } | |
552 | ||
553 | if (!rt) { | |
0da974f4 | 554 | rt = kzalloc(sizeof(*rt), GFP_ATOMIC); |
1da177e4 LT |
555 | |
556 | retval = -ENOBUFS; | |
557 | if (!rt) | |
558 | goto out_unlock; | |
1da177e4 LT |
559 | |
560 | rt->next = atalk_routes; | |
561 | atalk_routes = rt; | |
562 | } | |
563 | ||
564 | /* Fill in the routing entry */ | |
565 | rt->target = ta->sat_addr; | |
c7f905f0 | 566 | dev_hold(devhint); |
1da177e4 LT |
567 | rt->dev = devhint; |
568 | rt->flags = r->rt_flags; | |
569 | rt->gateway = ga->sat_addr; | |
570 | ||
571 | retval = 0; | |
572 | out_unlock: | |
573 | write_unlock_bh(&atalk_routes_lock); | |
574 | out: | |
575 | return retval; | |
576 | } | |
577 | ||
578 | /* Delete a route. Find it and discard it */ | |
6f0984a0 | 579 | static int atrtr_delete(struct atalk_addr *addr) |
1da177e4 LT |
580 | { |
581 | struct atalk_route **r = &atalk_routes; | |
582 | int retval = 0; | |
583 | struct atalk_route *tmp; | |
584 | ||
585 | write_lock_bh(&atalk_routes_lock); | |
586 | while ((tmp = *r) != NULL) { | |
587 | if (tmp->target.s_net == addr->s_net && | |
588 | (!(tmp->flags&RTF_GATEWAY) || | |
589 | tmp->target.s_node == addr->s_node)) { | |
590 | *r = tmp->next; | |
591 | dev_put(tmp->dev); | |
592 | kfree(tmp); | |
593 | goto out; | |
594 | } | |
595 | r = &tmp->next; | |
596 | } | |
597 | retval = -ENOENT; | |
598 | out: | |
599 | write_unlock_bh(&atalk_routes_lock); | |
600 | return retval; | |
601 | } | |
602 | ||
603 | /* | |
604 | * Called when a device is downed. Just throw away any routes | |
605 | * via it. | |
606 | */ | |
607 | static void atrtr_device_down(struct net_device *dev) | |
608 | { | |
609 | struct atalk_route **r = &atalk_routes; | |
610 | struct atalk_route *tmp; | |
611 | ||
612 | write_lock_bh(&atalk_routes_lock); | |
613 | while ((tmp = *r) != NULL) { | |
614 | if (tmp->dev == dev) { | |
615 | *r = tmp->next; | |
616 | dev_put(dev); | |
617 | kfree(tmp); | |
618 | } else | |
619 | r = &tmp->next; | |
620 | } | |
621 | write_unlock_bh(&atalk_routes_lock); | |
622 | ||
623 | if (atrtr_default.dev == dev) | |
624 | atrtr_set_default(NULL); | |
625 | } | |
626 | ||
627 | /* Actually down the interface */ | |
628 | static inline void atalk_dev_down(struct net_device *dev) | |
629 | { | |
630 | atrtr_device_down(dev); /* Remove all routes for the device */ | |
631 | aarp_device_down(dev); /* Remove AARP entries for the device */ | |
632 | atif_drop_device(dev); /* Remove the device */ | |
633 | } | |
634 | ||
635 | /* | |
636 | * A device event has occurred. Watch for devices going down and | |
637 | * delete our use of them (iface and route). | |
638 | */ | |
639 | static int ddp_device_event(struct notifier_block *this, unsigned long event, | |
640 | void *ptr) | |
641 | { | |
351638e7 | 642 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
890d52d3 | 643 | |
721499e8 | 644 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
645 | return NOTIFY_DONE; |
646 | ||
1da177e4 LT |
647 | if (event == NETDEV_DOWN) |
648 | /* Discard any use of this */ | |
890d52d3 | 649 | atalk_dev_down(dev); |
1da177e4 LT |
650 | |
651 | return NOTIFY_DONE; | |
652 | } | |
653 | ||
654 | /* ioctl calls. Shouldn't even need touching */ | |
655 | /* Device configuration ioctl calls */ | |
656 | static int atif_ioctl(int cmd, void __user *arg) | |
657 | { | |
658 | static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; | |
659 | struct ifreq atreq; | |
660 | struct atalk_netrange *nr; | |
661 | struct sockaddr_at *sa; | |
662 | struct net_device *dev; | |
663 | struct atalk_iface *atif; | |
664 | int ct; | |
665 | int limit; | |
666 | struct rtentry rtdef; | |
667 | int add_route; | |
668 | ||
669 | if (copy_from_user(&atreq, arg, sizeof(atreq))) | |
670 | return -EFAULT; | |
671 | ||
881d966b | 672 | dev = __dev_get_by_name(&init_net, atreq.ifr_name); |
1da177e4 LT |
673 | if (!dev) |
674 | return -ENODEV; | |
675 | ||
676 | sa = (struct sockaddr_at *)&atreq.ifr_addr; | |
677 | atif = atalk_find_dev(dev); | |
678 | ||
679 | switch (cmd) { | |
4a9e4b09 JP |
680 | case SIOCSIFADDR: |
681 | if (!capable(CAP_NET_ADMIN)) | |
682 | return -EPERM; | |
683 | if (sa->sat_family != AF_APPLETALK) | |
684 | return -EINVAL; | |
685 | if (dev->type != ARPHRD_ETHER && | |
686 | dev->type != ARPHRD_LOOPBACK && | |
687 | dev->type != ARPHRD_LOCALTLK && | |
688 | dev->type != ARPHRD_PPP) | |
689 | return -EPROTONOSUPPORT; | |
690 | ||
691 | nr = (struct atalk_netrange *)&sa->sat_zero[0]; | |
692 | add_route = 1; | |
693 | ||
694 | /* | |
695 | * if this is a point-to-point iface, and we already | |
696 | * have an iface for this AppleTalk address, then we | |
697 | * should not add a route | |
698 | */ | |
699 | if ((dev->flags & IFF_POINTOPOINT) && | |
700 | atalk_find_interface(sa->sat_addr.s_net, | |
701 | sa->sat_addr.s_node)) { | |
702 | printk(KERN_DEBUG "AppleTalk: point-to-point " | |
703 | "interface added with " | |
704 | "existing address\n"); | |
705 | add_route = 0; | |
706 | } | |
1da177e4 | 707 | |
4a9e4b09 JP |
708 | /* |
709 | * Phase 1 is fine on LocalTalk but we don't do | |
710 | * EtherTalk phase 1. Anyone wanting to add it go ahead. | |
711 | */ | |
712 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
713 | return -EPROTONOSUPPORT; | |
714 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
715 | sa->sat_addr.s_node == 254) | |
716 | return -EINVAL; | |
717 | if (atif) { | |
718 | /* Already setting address */ | |
719 | if (atif->status & ATIF_PROBE) | |
720 | return -EBUSY; | |
721 | ||
722 | atif->address.s_net = sa->sat_addr.s_net; | |
723 | atif->address.s_node = sa->sat_addr.s_node; | |
724 | atrtr_device_down(dev); /* Flush old routes */ | |
725 | } else { | |
726 | atif = atif_add_device(dev, &sa->sat_addr); | |
1da177e4 | 727 | if (!atif) |
4a9e4b09 JP |
728 | return -ENOMEM; |
729 | } | |
730 | atif->nets = *nr; | |
731 | ||
732 | /* | |
733 | * Check if the chosen address is used. If so we | |
734 | * error and atalkd will try another. | |
735 | */ | |
736 | ||
737 | if (!(dev->flags & IFF_LOOPBACK) && | |
738 | !(dev->flags & IFF_POINTOPOINT) && | |
739 | atif_probe_device(atif) < 0) { | |
740 | atif_drop_device(dev); | |
741 | return -EADDRINUSE; | |
742 | } | |
1da177e4 | 743 | |
4a9e4b09 JP |
744 | /* Hey it worked - add the direct routes */ |
745 | sa = (struct sockaddr_at *)&rtdef.rt_gateway; | |
746 | sa->sat_family = AF_APPLETALK; | |
747 | sa->sat_addr.s_net = atif->address.s_net; | |
748 | sa->sat_addr.s_node = atif->address.s_node; | |
749 | sa = (struct sockaddr_at *)&rtdef.rt_dst; | |
750 | rtdef.rt_flags = RTF_UP; | |
751 | sa->sat_family = AF_APPLETALK; | |
752 | sa->sat_addr.s_node = ATADDR_ANYNODE; | |
753 | if (dev->flags & IFF_LOOPBACK || | |
754 | dev->flags & IFF_POINTOPOINT) | |
755 | rtdef.rt_flags |= RTF_HOST; | |
756 | ||
757 | /* Routerless initial state */ | |
758 | if (nr->nr_firstnet == htons(0) && | |
759 | nr->nr_lastnet == htons(0xFFFE)) { | |
1da177e4 | 760 | sa->sat_addr.s_net = atif->address.s_net; |
4a9e4b09 JP |
761 | atrtr_create(&rtdef, dev); |
762 | atrtr_set_default(dev); | |
763 | } else { | |
764 | limit = ntohs(nr->nr_lastnet); | |
765 | if (limit - ntohs(nr->nr_firstnet) > 4096) { | |
766 | printk(KERN_WARNING "Too many routes/" | |
767 | "iface.\n"); | |
1da177e4 | 768 | return -EINVAL; |
4a9e4b09 JP |
769 | } |
770 | if (add_route) | |
771 | for (ct = ntohs(nr->nr_firstnet); | |
772 | ct <= limit; ct++) { | |
773 | sa->sat_addr.s_net = htons(ct); | |
774 | atrtr_create(&rtdef, dev); | |
775 | } | |
776 | } | |
777 | dev_mc_add_global(dev, aarp_mcast); | |
778 | return 0; | |
779 | ||
780 | case SIOCGIFADDR: | |
781 | if (!atif) | |
782 | return -EADDRNOTAVAIL; | |
783 | ||
784 | sa->sat_family = AF_APPLETALK; | |
785 | sa->sat_addr = atif->address; | |
786 | break; | |
787 | ||
788 | case SIOCGIFBRDADDR: | |
789 | if (!atif) | |
790 | return -EADDRNOTAVAIL; | |
791 | ||
792 | sa->sat_family = AF_APPLETALK; | |
793 | sa->sat_addr.s_net = atif->address.s_net; | |
794 | sa->sat_addr.s_node = ATADDR_BCAST; | |
795 | break; | |
796 | ||
797 | case SIOCATALKDIFADDR: | |
798 | case SIOCDIFADDR: | |
799 | if (!capable(CAP_NET_ADMIN)) | |
800 | return -EPERM; | |
801 | if (sa->sat_family != AF_APPLETALK) | |
802 | return -EINVAL; | |
803 | atalk_dev_down(dev); | |
804 | break; | |
805 | ||
806 | case SIOCSARP: | |
807 | if (!capable(CAP_NET_ADMIN)) | |
808 | return -EPERM; | |
809 | if (sa->sat_family != AF_APPLETALK) | |
810 | return -EINVAL; | |
811 | /* | |
812 | * for now, we only support proxy AARP on ELAP; | |
813 | * we should be able to do it for LocalTalk, too. | |
814 | */ | |
815 | if (dev->type != ARPHRD_ETHER) | |
816 | return -EPROTONOSUPPORT; | |
817 | ||
818 | /* | |
819 | * atif points to the current interface on this network; | |
820 | * we aren't concerned about its current status (at | |
821 | * least for now), but it has all the settings about | |
822 | * the network we're going to probe. Consequently, it | |
823 | * must exist. | |
824 | */ | |
825 | if (!atif) | |
826 | return -EADDRNOTAVAIL; | |
827 | ||
828 | nr = (struct atalk_netrange *)&(atif->nets); | |
829 | /* | |
830 | * Phase 1 is fine on Localtalk but we don't do | |
831 | * Ethertalk phase 1. Anyone wanting to add it go ahead. | |
832 | */ | |
833 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) | |
834 | return -EPROTONOSUPPORT; | |
835 | ||
836 | if (sa->sat_addr.s_node == ATADDR_BCAST || | |
837 | sa->sat_addr.s_node == 254) | |
838 | return -EINVAL; | |
839 | ||
840 | /* | |
841 | * Check if the chosen address is used. If so we | |
842 | * error and ATCP will try another. | |
843 | */ | |
844 | if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) | |
845 | return -EADDRINUSE; | |
846 | ||
847 | /* | |
848 | * We now have an address on the local network, and | |
849 | * the AARP code will defend it for us until we take it | |
850 | * down. We don't set up any routes right now, because | |
851 | * ATCP will install them manually via SIOCADDRT. | |
852 | */ | |
853 | break; | |
854 | ||
855 | case SIOCDARP: | |
856 | if (!capable(CAP_NET_ADMIN)) | |
857 | return -EPERM; | |
858 | if (sa->sat_family != AF_APPLETALK) | |
859 | return -EINVAL; | |
860 | if (!atif) | |
861 | return -EADDRNOTAVAIL; | |
862 | ||
863 | /* give to aarp module to remove proxy entry */ | |
864 | aarp_proxy_remove(atif->dev, &(sa->sat_addr)); | |
865 | return 0; | |
1da177e4 LT |
866 | } |
867 | ||
868 | return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; | |
869 | } | |
870 | ||
a5004923 CH |
871 | static int atrtr_ioctl_addrt(struct rtentry *rt) |
872 | { | |
873 | struct net_device *dev = NULL; | |
874 | ||
875 | if (rt->rt_dev) { | |
876 | char name[IFNAMSIZ]; | |
877 | ||
878 | if (copy_from_user(name, rt->rt_dev, IFNAMSIZ-1)) | |
879 | return -EFAULT; | |
880 | name[IFNAMSIZ-1] = '\0'; | |
881 | ||
882 | dev = __dev_get_by_name(&init_net, name); | |
883 | if (!dev) | |
884 | return -ENODEV; | |
885 | } | |
886 | return atrtr_create(rt, dev); | |
887 | } | |
888 | ||
1da177e4 LT |
889 | /* Routing ioctl() calls */ |
890 | static int atrtr_ioctl(unsigned int cmd, void __user *arg) | |
891 | { | |
892 | struct rtentry rt; | |
893 | ||
894 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
895 | return -EFAULT; | |
896 | ||
897 | switch (cmd) { | |
4a9e4b09 JP |
898 | case SIOCDELRT: |
899 | if (rt.rt_dst.sa_family != AF_APPLETALK) | |
900 | return -EINVAL; | |
901 | return atrtr_delete(&((struct sockaddr_at *) | |
902 | &rt.rt_dst)->sat_addr); | |
903 | ||
a5004923 CH |
904 | case SIOCADDRT: |
905 | return atrtr_ioctl_addrt(&rt); | |
1da177e4 LT |
906 | } |
907 | return -EINVAL; | |
908 | } | |
909 | ||
910 | /**************************************************************************\ | |
911 | * * | |
912 | * Handling for system calls applied via the various interfaces to an * | |
913 | * AppleTalk socket object. * | |
914 | * * | |
915 | \**************************************************************************/ | |
916 | ||
917 | /* | |
918 | * Checksum: This is 'optional'. It's quite likely also a good | |
919 | * candidate for assembler hackery 8) | |
920 | */ | |
ed4477b9 | 921 | static unsigned long atalk_sum_partial(const unsigned char *data, |
1da177e4 LT |
922 | int len, unsigned long sum) |
923 | { | |
924 | /* This ought to be unwrapped neatly. I'll trust gcc for now */ | |
925 | while (len--) { | |
f7a3a1d8 JP |
926 | sum += *data++; |
927 | sum = rol16(sum, 1); | |
1da177e4 LT |
928 | } |
929 | return sum; | |
930 | } | |
931 | ||
932 | /* Checksum skb data -- similar to skb_checksum */ | |
933 | static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, | |
934 | int len, unsigned long sum) | |
935 | { | |
1a028e50 | 936 | int start = skb_headlen(skb); |
c32ba3f9 | 937 | struct sk_buff *frag_iter; |
1da177e4 LT |
938 | int i, copy; |
939 | ||
940 | /* checksum stuff in header space */ | |
fd1dc261 | 941 | if ((copy = start - offset) > 0) { |
1da177e4 LT |
942 | if (copy > len) |
943 | copy = len; | |
944 | sum = atalk_sum_partial(skb->data + offset, copy, sum); | |
fd1dc261 | 945 | if ((len -= copy) == 0) |
1da177e4 LT |
946 | return sum; |
947 | ||
948 | offset += copy; | |
949 | } | |
950 | ||
951 | /* checksum stuff in frags */ | |
952 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1a028e50 | 953 | int end; |
9e903e08 | 954 | const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
547b792c | 955 | WARN_ON(start > offset + len); |
1a028e50 | 956 | |
9e903e08 | 957 | end = start + skb_frag_size(frag); |
1da177e4 LT |
958 | if ((copy = end - offset) > 0) { |
959 | u8 *vaddr; | |
1da177e4 LT |
960 | |
961 | if (copy > len) | |
962 | copy = len; | |
51c56b00 | 963 | vaddr = kmap_atomic(skb_frag_page(frag)); |
b54c9d5b JL |
964 | sum = atalk_sum_partial(vaddr + skb_frag_off(frag) + |
965 | offset - start, copy, sum); | |
51c56b00 | 966 | kunmap_atomic(vaddr); |
1da177e4 LT |
967 | |
968 | if (!(len -= copy)) | |
969 | return sum; | |
970 | offset += copy; | |
971 | } | |
1a028e50 | 972 | start = end; |
1da177e4 LT |
973 | } |
974 | ||
c32ba3f9 DM |
975 | skb_walk_frags(skb, frag_iter) { |
976 | int end; | |
1a028e50 | 977 | |
c32ba3f9 | 978 | WARN_ON(start > offset + len); |
1da177e4 | 979 | |
c32ba3f9 DM |
980 | end = start + frag_iter->len; |
981 | if ((copy = end - offset) > 0) { | |
982 | if (copy > len) | |
983 | copy = len; | |
984 | sum = atalk_sum_skb(frag_iter, offset - start, | |
985 | copy, sum); | |
986 | if ((len -= copy) == 0) | |
987 | return sum; | |
988 | offset += copy; | |
1da177e4 | 989 | } |
c32ba3f9 | 990 | start = end; |
1da177e4 LT |
991 | } |
992 | ||
993 | BUG_ON(len > 0); | |
994 | ||
995 | return sum; | |
996 | } | |
997 | ||
2a50f28c | 998 | static __be16 atalk_checksum(const struct sk_buff *skb, int len) |
1da177e4 LT |
999 | { |
1000 | unsigned long sum; | |
1001 | ||
1002 | /* skip header 4 bytes */ | |
1003 | sum = atalk_sum_skb(skb, 4, len-4, 0); | |
1004 | ||
1005 | /* Use 0xFFFF for 0. 0 itself means none */ | |
2a50f28c | 1006 | return sum ? htons((unsigned short)sum) : htons(0xFFFF); |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | static struct proto ddp_proto = { | |
1010 | .name = "DDP", | |
1011 | .owner = THIS_MODULE, | |
1012 | .obj_size = sizeof(struct atalk_sock), | |
1013 | }; | |
1014 | ||
1015 | /* | |
1016 | * Create a socket. Initialise the socket, blank the addresses | |
1017 | * set the state. | |
1018 | */ | |
3f378b68 EP |
1019 | static int atalk_create(struct net *net, struct socket *sock, int protocol, |
1020 | int kern) | |
1da177e4 LT |
1021 | { |
1022 | struct sock *sk; | |
1023 | int rc = -ESOCKTNOSUPPORT; | |
1024 | ||
09ad9bc7 | 1025 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
1026 | return -EAFNOSUPPORT; |
1027 | ||
1da177e4 LT |
1028 | /* |
1029 | * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do | |
ed4477b9 | 1030 | * and gives you the full ELAP frame. Should be handy for CAP 8) |
1da177e4 LT |
1031 | */ |
1032 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) | |
1033 | goto out; | |
6cc03e8a ON |
1034 | |
1035 | rc = -EPERM; | |
1036 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) | |
1037 | goto out; | |
1038 | ||
1da177e4 | 1039 | rc = -ENOMEM; |
11aa9c28 | 1040 | sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, kern); |
1da177e4 LT |
1041 | if (!sk) |
1042 | goto out; | |
1043 | rc = 0; | |
1044 | sock->ops = &atalk_dgram_ops; | |
1045 | sock_init_data(sock, sk); | |
1046 | ||
1047 | /* Checksums on by default */ | |
1048 | sock_set_flag(sk, SOCK_ZAPPED); | |
1049 | out: | |
1050 | return rc; | |
1051 | } | |
1052 | ||
1053 | /* Free a socket. No work needed */ | |
1054 | static int atalk_release(struct socket *sock) | |
1055 | { | |
1056 | struct sock *sk = sock->sk; | |
1057 | ||
1058 | if (sk) { | |
c100c8f4 DM |
1059 | sock_hold(sk); |
1060 | lock_sock(sk); | |
1061 | ||
1da177e4 LT |
1062 | sock_orphan(sk); |
1063 | sock->sk = NULL; | |
1064 | atalk_destroy_socket(sk); | |
b20e7bbf | 1065 | |
c100c8f4 DM |
1066 | release_sock(sk); |
1067 | sock_put(sk); | |
1068 | } | |
1da177e4 LT |
1069 | return 0; |
1070 | } | |
1071 | ||
1072 | /** | |
1073 | * atalk_pick_and_bind_port - Pick a source port when one is not given | |
2c53040f BH |
1074 | * @sk: socket to insert into the tables |
1075 | * @sat: address to search for | |
1da177e4 LT |
1076 | * |
1077 | * Pick a source port when one is not given. If we can find a suitable free | |
1078 | * one, we insert the socket into the tables using it. | |
1079 | * | |
1080 | * This whole operation must be atomic. | |
1081 | */ | |
1082 | static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat) | |
1083 | { | |
1084 | int retval; | |
1085 | ||
1086 | write_lock_bh(&atalk_sockets_lock); | |
1087 | ||
1088 | for (sat->sat_port = ATPORT_RESERVED; | |
1089 | sat->sat_port < ATPORT_LAST; | |
1090 | sat->sat_port++) { | |
1091 | struct sock *s; | |
1da177e4 | 1092 | |
b67bfe0d | 1093 | sk_for_each(s, &atalk_sockets) { |
1da177e4 LT |
1094 | struct atalk_sock *at = at_sk(s); |
1095 | ||
1096 | if (at->src_net == sat->sat_addr.s_net && | |
1097 | at->src_node == sat->sat_addr.s_node && | |
1098 | at->src_port == sat->sat_port) | |
1099 | goto try_next_port; | |
1100 | } | |
1101 | ||
1102 | /* Wheee, it's free, assign and insert. */ | |
1103 | __atalk_insert_socket(sk); | |
1104 | at_sk(sk)->src_port = sat->sat_port; | |
1105 | retval = 0; | |
1106 | goto out; | |
1107 | ||
1108 | try_next_port:; | |
1109 | } | |
1110 | ||
1111 | retval = -EBUSY; | |
1112 | out: | |
1113 | write_unlock_bh(&atalk_sockets_lock); | |
1114 | return retval; | |
1115 | } | |
1116 | ||
1117 | static int atalk_autobind(struct sock *sk) | |
1118 | { | |
1119 | struct atalk_sock *at = at_sk(sk); | |
1120 | struct sockaddr_at sat; | |
1121 | struct atalk_addr *ap = atalk_find_primary(); | |
1122 | int n = -EADDRNOTAVAIL; | |
1123 | ||
1124 | if (!ap || ap->s_net == htons(ATADDR_ANYNET)) | |
1125 | goto out; | |
1126 | ||
1127 | at->src_net = sat.sat_addr.s_net = ap->s_net; | |
1128 | at->src_node = sat.sat_addr.s_node = ap->s_node; | |
1129 | ||
1130 | n = atalk_pick_and_bind_port(sk, &sat); | |
1131 | if (!n) | |
1132 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1133 | out: | |
1134 | return n; | |
1135 | } | |
1136 | ||
1137 | /* Set the address 'our end' of the connection */ | |
1138 | static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1139 | { | |
1140 | struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; | |
1141 | struct sock *sk = sock->sk; | |
1142 | struct atalk_sock *at = at_sk(sk); | |
ecced8ba | 1143 | int err; |
1da177e4 LT |
1144 | |
1145 | if (!sock_flag(sk, SOCK_ZAPPED) || | |
1146 | addr_len != sizeof(struct sockaddr_at)) | |
1147 | return -EINVAL; | |
1148 | ||
1149 | if (addr->sat_family != AF_APPLETALK) | |
1150 | return -EAFNOSUPPORT; | |
1151 | ||
60d9f461 | 1152 | lock_sock(sk); |
1da177e4 LT |
1153 | if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { |
1154 | struct atalk_addr *ap = atalk_find_primary(); | |
1155 | ||
ecced8ba | 1156 | err = -EADDRNOTAVAIL; |
1da177e4 | 1157 | if (!ap) |
ecced8ba | 1158 | goto out; |
1da177e4 LT |
1159 | |
1160 | at->src_net = addr->sat_addr.s_net = ap->s_net; | |
fd1dc261 | 1161 | at->src_node = addr->sat_addr.s_node = ap->s_node; |
1da177e4 | 1162 | } else { |
ecced8ba | 1163 | err = -EADDRNOTAVAIL; |
1da177e4 LT |
1164 | if (!atalk_find_interface(addr->sat_addr.s_net, |
1165 | addr->sat_addr.s_node)) | |
ecced8ba | 1166 | goto out; |
1da177e4 LT |
1167 | |
1168 | at->src_net = addr->sat_addr.s_net; | |
1169 | at->src_node = addr->sat_addr.s_node; | |
1170 | } | |
1171 | ||
1172 | if (addr->sat_port == ATADDR_ANYPORT) { | |
ecced8ba | 1173 | err = atalk_pick_and_bind_port(sk, addr); |
1da177e4 | 1174 | |
ecced8ba AB |
1175 | if (err < 0) |
1176 | goto out; | |
1da177e4 LT |
1177 | } else { |
1178 | at->src_port = addr->sat_port; | |
1179 | ||
ecced8ba | 1180 | err = -EADDRINUSE; |
1da177e4 | 1181 | if (atalk_find_or_insert_socket(sk, addr)) |
ecced8ba | 1182 | goto out; |
1da177e4 LT |
1183 | } |
1184 | ||
1185 | sock_reset_flag(sk, SOCK_ZAPPED); | |
ecced8ba AB |
1186 | err = 0; |
1187 | out: | |
60d9f461 | 1188 | release_sock(sk); |
ecced8ba | 1189 | return err; |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | /* Set the address we talk to */ | |
1193 | static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, | |
1194 | int addr_len, int flags) | |
1195 | { | |
1196 | struct sock *sk = sock->sk; | |
1197 | struct atalk_sock *at = at_sk(sk); | |
1198 | struct sockaddr_at *addr; | |
ecced8ba | 1199 | int err; |
1da177e4 LT |
1200 | |
1201 | sk->sk_state = TCP_CLOSE; | |
1202 | sock->state = SS_UNCONNECTED; | |
1203 | ||
1204 | if (addr_len != sizeof(*addr)) | |
1205 | return -EINVAL; | |
1206 | ||
1207 | addr = (struct sockaddr_at *)uaddr; | |
1208 | ||
1209 | if (addr->sat_family != AF_APPLETALK) | |
1210 | return -EAFNOSUPPORT; | |
1211 | ||
1212 | if (addr->sat_addr.s_node == ATADDR_BCAST && | |
1213 | !sock_flag(sk, SOCK_BROADCAST)) { | |
ed4477b9 | 1214 | #if 1 |
278f015e | 1215 | pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n", |
1da177e4 LT |
1216 | current->comm); |
1217 | #else | |
1218 | return -EACCES; | |
ed4477b9 | 1219 | #endif |
1da177e4 LT |
1220 | } |
1221 | ||
60d9f461 | 1222 | lock_sock(sk); |
ecced8ba | 1223 | err = -EBUSY; |
1da177e4 LT |
1224 | if (sock_flag(sk, SOCK_ZAPPED)) |
1225 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1226 | goto out; |
1da177e4 | 1227 | |
ecced8ba | 1228 | err = -ENETUNREACH; |
1da177e4 | 1229 | if (!atrtr_get_dev(&addr->sat_addr)) |
ecced8ba | 1230 | goto out; |
1da177e4 LT |
1231 | |
1232 | at->dest_port = addr->sat_port; | |
1233 | at->dest_net = addr->sat_addr.s_net; | |
1234 | at->dest_node = addr->sat_addr.s_node; | |
1235 | ||
1236 | sock->state = SS_CONNECTED; | |
1237 | sk->sk_state = TCP_ESTABLISHED; | |
ecced8ba AB |
1238 | err = 0; |
1239 | out: | |
60d9f461 | 1240 | release_sock(sk); |
ecced8ba | 1241 | return err; |
1da177e4 LT |
1242 | } |
1243 | ||
1244 | /* | |
1245 | * Find the name of an AppleTalk socket. Just copy the right | |
1246 | * fields into the sockaddr. | |
1247 | */ | |
1248 | static int atalk_getname(struct socket *sock, struct sockaddr *uaddr, | |
9b2c45d4 | 1249 | int peer) |
1da177e4 LT |
1250 | { |
1251 | struct sockaddr_at sat; | |
1252 | struct sock *sk = sock->sk; | |
1253 | struct atalk_sock *at = at_sk(sk); | |
ecced8ba | 1254 | int err; |
1da177e4 | 1255 | |
60d9f461 | 1256 | lock_sock(sk); |
ecced8ba | 1257 | err = -ENOBUFS; |
1da177e4 LT |
1258 | if (sock_flag(sk, SOCK_ZAPPED)) |
1259 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1260 | goto out; |
1da177e4 | 1261 | |
fccc9f1f | 1262 | memset(&sat, 0, sizeof(sat)); |
1da177e4 LT |
1263 | |
1264 | if (peer) { | |
ecced8ba | 1265 | err = -ENOTCONN; |
1da177e4 | 1266 | if (sk->sk_state != TCP_ESTABLISHED) |
ecced8ba | 1267 | goto out; |
1da177e4 LT |
1268 | |
1269 | sat.sat_addr.s_net = at->dest_net; | |
1270 | sat.sat_addr.s_node = at->dest_node; | |
1271 | sat.sat_port = at->dest_port; | |
1272 | } else { | |
1273 | sat.sat_addr.s_net = at->src_net; | |
1274 | sat.sat_addr.s_node = at->src_node; | |
1275 | sat.sat_port = at->src_port; | |
1276 | } | |
1277 | ||
1278 | sat.sat_family = AF_APPLETALK; | |
1279 | memcpy(uaddr, &sat, sizeof(sat)); | |
9b2c45d4 | 1280 | err = sizeof(struct sockaddr_at); |
ecced8ba AB |
1281 | |
1282 | out: | |
60d9f461 | 1283 | release_sock(sk); |
ecced8ba | 1284 | return err; |
1da177e4 LT |
1285 | } |
1286 | ||
a73ec314 | 1287 | #if IS_ENABLED(CONFIG_IPDDP) |
1da177e4 LT |
1288 | static __inline__ int is_ip_over_ddp(struct sk_buff *skb) |
1289 | { | |
ed4477b9 | 1290 | return skb->data[12] == 22; |
1da177e4 LT |
1291 | } |
1292 | ||
1293 | static int handle_ip_over_ddp(struct sk_buff *skb) | |
1294 | { | |
881d966b | 1295 | struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0"); |
1da177e4 LT |
1296 | struct net_device_stats *stats; |
1297 | ||
1298 | /* This needs to be able to handle ipddp"N" devices */ | |
ffcfb8db ACM |
1299 | if (!dev) { |
1300 | kfree_skb(skb); | |
1301 | return NET_RX_DROP; | |
1302 | } | |
1da177e4 | 1303 | |
ed4477b9 YH |
1304 | skb->protocol = htons(ETH_P_IP); |
1305 | skb_pull(skb, 13); | |
1306 | skb->dev = dev; | |
badff6d0 | 1307 | skb_reset_transport_header(skb); |
1da177e4 | 1308 | |
524ad0a7 | 1309 | stats = netdev_priv(dev); |
ed4477b9 YH |
1310 | stats->rx_packets++; |
1311 | stats->rx_bytes += skb->len + 13; | |
ffcfb8db | 1312 | return netif_rx(skb); /* Send the SKB up to a higher place. */ |
1da177e4 LT |
1313 | } |
1314 | #else | |
1315 | /* make it easy for gcc to optimize this test out, i.e. kill the code */ | |
1316 | #define is_ip_over_ddp(skb) 0 | |
1317 | #define handle_ip_over_ddp(skb) 0 | |
1318 | #endif | |
1319 | ||
ffcfb8db ACM |
1320 | static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev, |
1321 | struct ddpehdr *ddp, __u16 len_hops, int origlen) | |
1da177e4 LT |
1322 | { |
1323 | struct atalk_route *rt; | |
1324 | struct atalk_addr ta; | |
1325 | ||
1326 | /* | |
1327 | * Don't route multicast, etc., packets, or packets sent to "this | |
ed4477b9 | 1328 | * network" |
1da177e4 LT |
1329 | */ |
1330 | if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { | |
1331 | /* | |
1332 | * FIXME: | |
1333 | * | |
1334 | * Can it ever happen that a packet is from a PPP iface and | |
1335 | * needs to be broadcast onto the default network? | |
1336 | */ | |
1337 | if (dev->type == ARPHRD_PPP) | |
1338 | printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " | |
1339 | "packet received from PPP iface\n"); | |
1340 | goto free_it; | |
1341 | } | |
1342 | ||
1343 | ta.s_net = ddp->deh_dnet; | |
1344 | ta.s_node = ddp->deh_dnode; | |
1345 | ||
1346 | /* Route the packet */ | |
1347 | rt = atrtr_find(&ta); | |
2a50f28c AV |
1348 | /* increment hops count */ |
1349 | len_hops += 1 << 10; | |
1350 | if (!rt || !(len_hops & (15 << 10))) | |
1da177e4 | 1351 | goto free_it; |
2a50f28c | 1352 | |
1da177e4 | 1353 | /* FIXME: use skb->cb to be able to use shared skbs */ |
1da177e4 LT |
1354 | |
1355 | /* | |
1356 | * Route goes through another gateway, so set the target to the | |
1357 | * gateway instead. | |
1358 | */ | |
1359 | ||
1360 | if (rt->flags & RTF_GATEWAY) { | |
1361 | ta.s_net = rt->gateway.s_net; | |
1362 | ta.s_node = rt->gateway.s_node; | |
1363 | } | |
1364 | ||
ed4477b9 YH |
1365 | /* Fix up skb->len field */ |
1366 | skb_trim(skb, min_t(unsigned int, origlen, | |
1da177e4 | 1367 | (rt->dev->hard_header_len + |
2a50f28c | 1368 | ddp_dl->header_length + (len_hops & 1023)))); |
1da177e4 | 1369 | |
1da177e4 | 1370 | /* FIXME: use skb->cb to be able to use shared skbs */ |
2a50f28c | 1371 | ddp->deh_len_hops = htons(len_hops); |
1da177e4 LT |
1372 | |
1373 | /* | |
1374 | * Send the buffer onwards | |
1375 | * | |
1376 | * Now we must always be careful. If it's come from LocalTalk to | |
1377 | * EtherTalk it might not fit | |
1378 | * | |
1379 | * Order matters here: If a packet has to be copied to make a new | |
1380 | * headroom (rare hopefully) then it won't need unsharing. | |
1381 | * | |
1382 | * Note. ddp-> becomes invalid at the realloc. | |
1383 | */ | |
1384 | if (skb_headroom(skb) < 22) { | |
1385 | /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ | |
1386 | struct sk_buff *nskb = skb_realloc_headroom(skb, 32); | |
1387 | kfree_skb(skb); | |
1da177e4 LT |
1388 | skb = nskb; |
1389 | } else | |
1390 | skb = skb_unshare(skb, GFP_ATOMIC); | |
ed4477b9 | 1391 | |
1da177e4 LT |
1392 | /* |
1393 | * If the buffer didn't vanish into the lack of space bitbucket we can | |
1394 | * send it. | |
1395 | */ | |
ffcfb8db ACM |
1396 | if (skb == NULL) |
1397 | goto drop; | |
1398 | ||
1399 | if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP) | |
1400 | return NET_RX_DROP; | |
8be8057e | 1401 | return NET_RX_SUCCESS; |
1da177e4 LT |
1402 | free_it: |
1403 | kfree_skb(skb); | |
ffcfb8db ACM |
1404 | drop: |
1405 | return NET_RX_DROP; | |
1da177e4 LT |
1406 | } |
1407 | ||
1408 | /** | |
1409 | * atalk_rcv - Receive a packet (in skb) from device dev | |
1410 | * @skb - packet received | |
1411 | * @dev - network device where the packet comes from | |
1412 | * @pt - packet type | |
1413 | * | |
1414 | * Receive a packet (in skb) from device dev. This has come from the SNAP | |
b0e380b1 ACM |
1415 | * decoder, and on entry skb->transport_header is the DDP header, skb->len |
1416 | * is the DDP header, skb->len is the DDP length. The physical headers | |
1417 | * have been extracted. PPP should probably pass frames marked as for this | |
1418 | * layer. [ie ARPHRD_ETHERTALK] | |
1da177e4 LT |
1419 | */ |
1420 | static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1421 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
1422 | { |
1423 | struct ddpehdr *ddp; | |
1424 | struct sock *sock; | |
1425 | struct atalk_iface *atif; | |
1426 | struct sockaddr_at tosat; | |
ed4477b9 | 1427 | int origlen; |
2a50f28c | 1428 | __u16 len_hops; |
1da177e4 | 1429 | |
721499e8 | 1430 | if (!net_eq(dev_net(dev), &init_net)) |
6885ffb3 | 1431 | goto drop; |
e730c155 | 1432 | |
1da177e4 | 1433 | /* Don't mangle buffer if shared */ |
ed4477b9 | 1434 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 | 1435 | goto out; |
ed4477b9 | 1436 | |
1da177e4 LT |
1437 | /* Size check and make sure header is contiguous */ |
1438 | if (!pskb_may_pull(skb, sizeof(*ddp))) | |
6885ffb3 | 1439 | goto drop; |
1da177e4 LT |
1440 | |
1441 | ddp = ddp_hdr(skb); | |
1442 | ||
2a50f28c | 1443 | len_hops = ntohs(ddp->deh_len_hops); |
1da177e4 LT |
1444 | |
1445 | /* Trim buffer in case of stray trailing data */ | |
1446 | origlen = skb->len; | |
2a50f28c | 1447 | skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); |
1da177e4 LT |
1448 | |
1449 | /* | |
1450 | * Size check to see if ddp->deh_len was crap | |
1451 | * (Otherwise we'll detonate most spectacularly | |
75559c16 | 1452 | * in the middle of atalk_checksum() or recvmsg()). |
1da177e4 | 1453 | */ |
75559c16 JD |
1454 | if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { |
1455 | pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " | |
1456 | "skb->len=%u)\n", len_hops & 1023, skb->len); | |
6885ffb3 | 1457 | goto drop; |
75559c16 | 1458 | } |
1da177e4 LT |
1459 | |
1460 | /* | |
1461 | * Any checksums. Note we don't do htons() on this == is assumed to be | |
1462 | * valid for net byte orders all over the networking code... | |
1463 | */ | |
1464 | if (ddp->deh_sum && | |
2a50f28c | 1465 | atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum) |
1da177e4 | 1466 | /* Not a valid AppleTalk frame - dustbin time */ |
6885ffb3 | 1467 | goto drop; |
1da177e4 LT |
1468 | |
1469 | /* Check the packet is aimed at us */ | |
1470 | if (!ddp->deh_dnet) /* Net 0 is 'this network' */ | |
1471 | atif = atalk_find_anynet(ddp->deh_dnode, dev); | |
1472 | else | |
1473 | atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); | |
1474 | ||
1da177e4 | 1475 | if (!atif) { |
64233bff OD |
1476 | /* Not ours, so we route the packet via the correct |
1477 | * AppleTalk iface | |
1478 | */ | |
ffcfb8db | 1479 | return atalk_route_packet(skb, dev, ddp, len_hops, origlen); |
1da177e4 LT |
1480 | } |
1481 | ||
1482 | /* if IP over DDP is not selected this code will be optimized out */ | |
1483 | if (is_ip_over_ddp(skb)) | |
1484 | return handle_ip_over_ddp(skb); | |
1485 | /* | |
1486 | * Which socket - atalk_search_socket() looks for a *full match* | |
1487 | * of the <net, node, port> tuple. | |
1488 | */ | |
1489 | tosat.sat_addr.s_net = ddp->deh_dnet; | |
1490 | tosat.sat_addr.s_node = ddp->deh_dnode; | |
1491 | tosat.sat_port = ddp->deh_dport; | |
1492 | ||
1493 | sock = atalk_search_socket(&tosat, atif); | |
1494 | if (!sock) /* But not one of our sockets */ | |
6885ffb3 | 1495 | goto drop; |
1da177e4 LT |
1496 | |
1497 | /* Queue packet (standard) */ | |
1da177e4 | 1498 | if (sock_queue_rcv_skb(sock, skb) < 0) |
6885ffb3 MS |
1499 | goto drop; |
1500 | ||
1501 | return NET_RX_SUCCESS; | |
1502 | ||
1503 | drop: | |
1da177e4 | 1504 | kfree_skb(skb); |
6885ffb3 MS |
1505 | out: |
1506 | return NET_RX_DROP; | |
1507 | ||
1da177e4 LT |
1508 | } |
1509 | ||
1510 | /* | |
1511 | * Receive a LocalTalk frame. We make some demands on the caller here. | |
1512 | * Caller must provide enough headroom on the packet to pull the short | |
1513 | * header and append a long one. | |
1514 | */ | |
1515 | static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1516 | struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 | 1517 | { |
721499e8 | 1518 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
1519 | goto freeit; |
1520 | ||
1da177e4 | 1521 | /* Expand any short form frames */ |
98e399f8 | 1522 | if (skb_mac_header(skb)[2] == 1) { |
1da177e4 LT |
1523 | struct ddpehdr *ddp; |
1524 | /* Find our address */ | |
1525 | struct atalk_addr *ap = atalk_find_dev_addr(dev); | |
1526 | ||
2a50f28c | 1527 | if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) |
1da177e4 LT |
1528 | goto freeit; |
1529 | ||
1530 | /* Don't mangle buffer if shared */ | |
ed4477b9 | 1531 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 LT |
1532 | return 0; |
1533 | ||
1534 | /* | |
1535 | * The push leaves us with a ddephdr not an shdr, and | |
1536 | * handily the port bytes in the right place preset. | |
1537 | */ | |
d58ff351 | 1538 | ddp = skb_push(skb, sizeof(*ddp) - 4); |
1da177e4 LT |
1539 | |
1540 | /* Now fill in the long header */ | |
1541 | ||
ed4477b9 YH |
1542 | /* |
1543 | * These two first. The mac overlays the new source/dest | |
1544 | * network information so we MUST copy these before | |
1545 | * we write the network numbers ! | |
1546 | */ | |
1da177e4 | 1547 | |
98e399f8 ACM |
1548 | ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */ |
1549 | ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */ | |
1da177e4 LT |
1550 | |
1551 | ddp->deh_dnet = ap->s_net; /* Network number */ | |
1552 | ddp->deh_snet = ap->s_net; | |
1553 | ddp->deh_sum = 0; /* No checksum */ | |
1554 | /* | |
1555 | * Not sure about this bit... | |
1556 | */ | |
2a50f28c AV |
1557 | /* Non routable, so force a drop if we slip up later */ |
1558 | ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); | |
1da177e4 | 1559 | } |
badff6d0 | 1560 | skb_reset_transport_header(skb); |
1da177e4 | 1561 | |
f2ccd8fa | 1562 | return atalk_rcv(skb, dev, pt, orig_dev); |
1da177e4 LT |
1563 | freeit: |
1564 | kfree_skb(skb); | |
1565 | return 0; | |
1566 | } | |
1567 | ||
1b784140 | 1568 | static int atalk_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
1569 | { |
1570 | struct sock *sk = sock->sk; | |
1571 | struct atalk_sock *at = at_sk(sk); | |
342dfc30 | 1572 | DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name); |
1da177e4 LT |
1573 | int flags = msg->msg_flags; |
1574 | int loopback = 0; | |
1575 | struct sockaddr_at local_satalk, gsat; | |
1576 | struct sk_buff *skb; | |
1577 | struct net_device *dev; | |
1578 | struct ddpehdr *ddp; | |
1579 | int size; | |
1580 | struct atalk_route *rt; | |
1581 | int err; | |
1582 | ||
1583 | if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) | |
1584 | return -EINVAL; | |
1585 | ||
1586 | if (len > DDP_MAXSZ) | |
1587 | return -EMSGSIZE; | |
1588 | ||
60d9f461 | 1589 | lock_sock(sk); |
1da177e4 | 1590 | if (usat) { |
ecced8ba | 1591 | err = -EBUSY; |
1da177e4 LT |
1592 | if (sock_flag(sk, SOCK_ZAPPED)) |
1593 | if (atalk_autobind(sk) < 0) | |
ecced8ba | 1594 | goto out; |
1da177e4 | 1595 | |
ecced8ba | 1596 | err = -EINVAL; |
1da177e4 LT |
1597 | if (msg->msg_namelen < sizeof(*usat) || |
1598 | usat->sat_family != AF_APPLETALK) | |
ecced8ba | 1599 | goto out; |
1da177e4 | 1600 | |
ecced8ba | 1601 | err = -EPERM; |
03ba9991 | 1602 | /* netatalk didn't implement this check */ |
1da177e4 LT |
1603 | if (usat->sat_addr.s_node == ATADDR_BCAST && |
1604 | !sock_flag(sk, SOCK_BROADCAST)) { | |
ecced8ba | 1605 | goto out; |
1da177e4 LT |
1606 | } |
1607 | } else { | |
ecced8ba | 1608 | err = -ENOTCONN; |
1da177e4 | 1609 | if (sk->sk_state != TCP_ESTABLISHED) |
ecced8ba | 1610 | goto out; |
1da177e4 LT |
1611 | usat = &local_satalk; |
1612 | usat->sat_family = AF_APPLETALK; | |
1613 | usat->sat_port = at->dest_port; | |
1614 | usat->sat_addr.s_node = at->dest_node; | |
1615 | usat->sat_addr.s_net = at->dest_net; | |
1616 | } | |
1617 | ||
1618 | /* Build a packet */ | |
1619 | SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); | |
1620 | ||
1621 | /* For headers */ | |
1622 | size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; | |
1623 | ||
1624 | if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { | |
1625 | rt = atrtr_find(&usat->sat_addr); | |
1da177e4 LT |
1626 | } else { |
1627 | struct atalk_addr at_hint; | |
1628 | ||
1629 | at_hint.s_node = 0; | |
1630 | at_hint.s_net = at->src_net; | |
1631 | ||
1632 | rt = atrtr_find(&at_hint); | |
1da177e4 | 1633 | } |
48bb230e | 1634 | err = -ENETUNREACH; |
64233bff | 1635 | if (!rt) |
ecced8ba | 1636 | goto out; |
64233bff OD |
1637 | |
1638 | dev = rt->dev; | |
1da177e4 LT |
1639 | |
1640 | SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", | |
1641 | sk, size, dev->name); | |
1642 | ||
1643 | size += dev->hard_header_len; | |
60d9f461 | 1644 | release_sock(sk); |
1da177e4 | 1645 | skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); |
60d9f461 | 1646 | lock_sock(sk); |
1da177e4 | 1647 | if (!skb) |
ecced8ba | 1648 | goto out; |
ed4477b9 | 1649 | |
1da177e4 LT |
1650 | skb_reserve(skb, ddp_dl->header_length); |
1651 | skb_reserve(skb, dev->hard_header_len); | |
1652 | skb->dev = dev; | |
1653 | ||
1654 | SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); | |
1655 | ||
4df864c1 | 1656 | ddp = skb_put(skb, sizeof(struct ddpehdr)); |
2a50f28c | 1657 | ddp->deh_len_hops = htons(len + sizeof(*ddp)); |
1da177e4 LT |
1658 | ddp->deh_dnet = usat->sat_addr.s_net; |
1659 | ddp->deh_snet = at->src_net; | |
1660 | ddp->deh_dnode = usat->sat_addr.s_node; | |
1661 | ddp->deh_snode = at->src_node; | |
1662 | ddp->deh_dport = usat->sat_port; | |
1663 | ddp->deh_sport = at->src_port; | |
1664 | ||
5b5e0928 | 1665 | SOCK_DEBUG(sk, "SK %p: Copy user data (%zd bytes).\n", sk, len); |
1da177e4 | 1666 | |
6ce8e9ce | 1667 | err = memcpy_from_msg(skb_put(skb, len), msg, len); |
1da177e4 LT |
1668 | if (err) { |
1669 | kfree_skb(skb); | |
ecced8ba AB |
1670 | err = -EFAULT; |
1671 | goto out; | |
1da177e4 LT |
1672 | } |
1673 | ||
28448b80 | 1674 | if (sk->sk_no_check_tx) |
1da177e4 LT |
1675 | ddp->deh_sum = 0; |
1676 | else | |
1677 | ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); | |
1678 | ||
1679 | /* | |
1680 | * Loopback broadcast packets to non gateway targets (ie routes | |
1681 | * to group we are in) | |
1682 | */ | |
1683 | if (ddp->deh_dnode == ATADDR_BCAST && | |
1684 | !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { | |
1685 | struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); | |
1686 | ||
1687 | if (skb2) { | |
1688 | loopback = 1; | |
1689 | SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); | |
ffcfb8db ACM |
1690 | /* |
1691 | * If it fails it is queued/sent above in the aarp queue | |
1692 | */ | |
1693 | aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL); | |
1da177e4 LT |
1694 | } |
1695 | } | |
1696 | ||
1697 | if (dev->flags & IFF_LOOPBACK || loopback) { | |
1698 | SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); | |
1699 | /* loop back */ | |
1700 | skb_orphan(skb); | |
64233bff OD |
1701 | if (ddp->deh_dnode == ATADDR_BCAST) { |
1702 | struct atalk_addr at_lo; | |
1703 | ||
1704 | at_lo.s_node = 0; | |
1705 | at_lo.s_net = 0; | |
1706 | ||
1707 | rt = atrtr_find(&at_lo); | |
1708 | if (!rt) { | |
1709 | kfree_skb(skb); | |
ecced8ba AB |
1710 | err = -ENETUNREACH; |
1711 | goto out; | |
64233bff OD |
1712 | } |
1713 | dev = rt->dev; | |
1714 | skb->dev = dev; | |
1715 | } | |
1da177e4 LT |
1716 | ddp_dl->request(ddp_dl, skb, dev->dev_addr); |
1717 | } else { | |
1718 | SOCK_DEBUG(sk, "SK %p: send out.\n", sk); | |
1719 | if (rt->flags & RTF_GATEWAY) { | |
1720 | gsat.sat_addr = rt->gateway; | |
1721 | usat = &gsat; | |
1722 | } | |
1723 | ||
ffcfb8db ACM |
1724 | /* |
1725 | * If it fails it is queued/sent above in the aarp queue | |
1726 | */ | |
1727 | aarp_send_ddp(dev, skb, &usat->sat_addr, NULL); | |
1da177e4 | 1728 | } |
5b5e0928 | 1729 | SOCK_DEBUG(sk, "SK %p: Done write (%zd).\n", sk, len); |
1da177e4 | 1730 | |
ecced8ba | 1731 | out: |
60d9f461 | 1732 | release_sock(sk); |
ecced8ba | 1733 | return err ? : len; |
1da177e4 LT |
1734 | } |
1735 | ||
1b784140 YX |
1736 | static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1737 | int flags) | |
1da177e4 LT |
1738 | { |
1739 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1740 | struct ddpehdr *ddp; |
1741 | int copied = 0; | |
2a50f28c | 1742 | int offset = 0; |
1da177e4 | 1743 | int err = 0; |
ecced8ba AB |
1744 | struct sk_buff *skb; |
1745 | ||
ecced8ba | 1746 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
1da177e4 | 1747 | flags & MSG_DONTWAIT, &err); |
60d9f461 AB |
1748 | lock_sock(sk); |
1749 | ||
1da177e4 | 1750 | if (!skb) |
ecced8ba | 1751 | goto out; |
1da177e4 LT |
1752 | |
1753 | /* FIXME: use skb->cb to be able to use shared skbs */ | |
1754 | ddp = ddp_hdr(skb); | |
2a50f28c | 1755 | copied = ntohs(ddp->deh_len_hops) & 1023; |
1da177e4 | 1756 | |
2a50f28c AV |
1757 | if (sk->sk_type != SOCK_RAW) { |
1758 | offset = sizeof(*ddp); | |
1759 | copied -= offset; | |
1760 | } | |
1da177e4 | 1761 | |
2a50f28c AV |
1762 | if (copied > size) { |
1763 | copied = size; | |
1764 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 | 1765 | } |
51f3d02b | 1766 | err = skb_copy_datagram_msg(skb, offset, msg, copied); |
1da177e4 | 1767 | |
f3d33426 | 1768 | if (!err && msg->msg_name) { |
342dfc30 | 1769 | DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name); |
f3d33426 HFS |
1770 | sat->sat_family = AF_APPLETALK; |
1771 | sat->sat_port = ddp->deh_sport; | |
1772 | sat->sat_addr.s_node = ddp->deh_snode; | |
1773 | sat->sat_addr.s_net = ddp->deh_snet; | |
1774 | msg->msg_namelen = sizeof(*sat); | |
1da177e4 LT |
1775 | } |
1776 | ||
1777 | skb_free_datagram(sk, skb); /* Free the datagram. */ | |
ecced8ba AB |
1778 | |
1779 | out: | |
60d9f461 | 1780 | release_sock(sk); |
1da177e4 LT |
1781 | return err ? : copied; |
1782 | } | |
1783 | ||
1784 | ||
1785 | /* | |
1786 | * AppleTalk ioctl calls. | |
1787 | */ | |
1788 | static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1789 | { | |
b5e5fa5e | 1790 | int rc = -ENOIOCTLCMD; |
1da177e4 LT |
1791 | struct sock *sk = sock->sk; |
1792 | void __user *argp = (void __user *)arg; | |
1793 | ||
1794 | switch (cmd) { | |
7b30600c | 1795 | /* Protocol layer */ |
1796 | case TIOCOUTQ: { | |
1797 | long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
1da177e4 | 1798 | |
7b30600c | 1799 | if (amount < 0) |
1800 | amount = 0; | |
1801 | rc = put_user(amount, (int __user *)argp); | |
1802 | break; | |
1803 | } | |
1804 | case TIOCINQ: { | |
1805 | /* | |
1806 | * These two are safe on a single CPU system as only | |
1807 | * user tasks fiddle here | |
1808 | */ | |
1809 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); | |
1810 | long amount = 0; | |
1da177e4 | 1811 | |
7b30600c | 1812 | if (skb) |
63ae8894 | 1813 | amount = skb->len - sizeof(struct ddpehdr); |
7b30600c | 1814 | rc = put_user(amount, (int __user *)argp); |
1815 | break; | |
1816 | } | |
7b30600c | 1817 | /* Routing */ |
1818 | case SIOCADDRT: | |
1819 | case SIOCDELRT: | |
1820 | rc = -EPERM; | |
1821 | if (capable(CAP_NET_ADMIN)) | |
1822 | rc = atrtr_ioctl(cmd, argp); | |
1823 | break; | |
1824 | /* Interface */ | |
1825 | case SIOCGIFADDR: | |
1826 | case SIOCSIFADDR: | |
1827 | case SIOCGIFBRDADDR: | |
1828 | case SIOCATALKDIFADDR: | |
1829 | case SIOCDIFADDR: | |
1830 | case SIOCSARP: /* proxy AARP */ | |
1831 | case SIOCDARP: /* proxy AARP */ | |
1832 | rtnl_lock(); | |
1833 | rc = atif_ioctl(cmd, argp); | |
1834 | rtnl_unlock(); | |
1835 | break; | |
1da177e4 LT |
1836 | } |
1837 | ||
1838 | return rc; | |
1839 | } | |
1840 | ||
f6c90b71 PV |
1841 | |
1842 | #ifdef CONFIG_COMPAT | |
dc13c876 CH |
1843 | static int atalk_compat_routing_ioctl(struct sock *sk, unsigned int cmd, |
1844 | struct compat_rtentry __user *ur) | |
1845 | { | |
1846 | compat_uptr_t rtdev; | |
1847 | struct rtentry rt; | |
1848 | ||
1849 | if (copy_from_user(&rt.rt_dst, &ur->rt_dst, | |
1850 | 3 * sizeof(struct sockaddr)) || | |
1851 | get_user(rt.rt_flags, &ur->rt_flags) || | |
1852 | get_user(rt.rt_metric, &ur->rt_metric) || | |
1853 | get_user(rt.rt_mtu, &ur->rt_mtu) || | |
1854 | get_user(rt.rt_window, &ur->rt_window) || | |
1855 | get_user(rt.rt_irtt, &ur->rt_irtt) || | |
1856 | get_user(rtdev, &ur->rt_dev)) | |
1857 | return -EFAULT; | |
1858 | ||
1859 | switch (cmd) { | |
1860 | case SIOCDELRT: | |
1861 | if (rt.rt_dst.sa_family != AF_APPLETALK) | |
1862 | return -EINVAL; | |
1863 | return atrtr_delete(&((struct sockaddr_at *) | |
1864 | &rt.rt_dst)->sat_addr); | |
1865 | ||
1866 | case SIOCADDRT: | |
1867 | rt.rt_dev = compat_ptr(rtdev); | |
1868 | return atrtr_ioctl_addrt(&rt); | |
1869 | default: | |
1870 | return -EINVAL; | |
1871 | } | |
1872 | } | |
f6c90b71 PV |
1873 | static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
1874 | { | |
dc13c876 CH |
1875 | void __user *argp = compat_ptr(arg); |
1876 | struct sock *sk = sock->sk; | |
1877 | ||
1878 | switch (cmd) { | |
1879 | case SIOCADDRT: | |
1880 | case SIOCDELRT: | |
1881 | return atalk_compat_routing_ioctl(sk, cmd, argp); | |
f6c90b71 | 1882 | /* |
20660221 AB |
1883 | * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we |
1884 | * cannot handle it in common code. The data we access if ifreq | |
1885 | * here is compatible, so we can simply call the native | |
1886 | * handler. | |
f6c90b71 | 1887 | */ |
dc13c876 CH |
1888 | case SIOCATALKDIFADDR: |
1889 | return atalk_ioctl(sock, cmd, (unsigned long)argp); | |
1890 | default: | |
1891 | return -ENOIOCTLCMD; | |
1892 | } | |
f6c90b71 | 1893 | } |
dc13c876 | 1894 | #endif /* CONFIG_COMPAT */ |
f6c90b71 PV |
1895 | |
1896 | ||
ec1b4cf7 | 1897 | static const struct net_proto_family atalk_family_ops = { |
1da177e4 LT |
1898 | .family = PF_APPLETALK, |
1899 | .create = atalk_create, | |
1900 | .owner = THIS_MODULE, | |
1901 | }; | |
1902 | ||
ecced8ba | 1903 | static const struct proto_ops atalk_dgram_ops = { |
1da177e4 LT |
1904 | .family = PF_APPLETALK, |
1905 | .owner = THIS_MODULE, | |
1906 | .release = atalk_release, | |
1907 | .bind = atalk_bind, | |
1908 | .connect = atalk_connect, | |
1909 | .socketpair = sock_no_socketpair, | |
1910 | .accept = sock_no_accept, | |
1911 | .getname = atalk_getname, | |
a11e1d43 | 1912 | .poll = datagram_poll, |
1da177e4 | 1913 | .ioctl = atalk_ioctl, |
c7cbdbf2 | 1914 | .gettstamp = sock_gettstamp, |
f6c90b71 PV |
1915 | #ifdef CONFIG_COMPAT |
1916 | .compat_ioctl = atalk_compat_ioctl, | |
1917 | #endif | |
1da177e4 LT |
1918 | .listen = sock_no_listen, |
1919 | .shutdown = sock_no_shutdown, | |
1da177e4 LT |
1920 | .sendmsg = atalk_sendmsg, |
1921 | .recvmsg = atalk_recvmsg, | |
1922 | .mmap = sock_no_mmap, | |
1923 | .sendpage = sock_no_sendpage, | |
1924 | }; | |
1925 | ||
1da177e4 LT |
1926 | static struct notifier_block ddp_notifier = { |
1927 | .notifier_call = ddp_device_event, | |
1928 | }; | |
1929 | ||
7546dd97 | 1930 | static struct packet_type ltalk_packet_type __read_mostly = { |
09640e63 | 1931 | .type = cpu_to_be16(ETH_P_LOCALTALK), |
1da177e4 LT |
1932 | .func = ltalk_rcv, |
1933 | }; | |
1934 | ||
7546dd97 | 1935 | static struct packet_type ppptalk_packet_type __read_mostly = { |
09640e63 | 1936 | .type = cpu_to_be16(ETH_P_PPPTALK), |
1da177e4 LT |
1937 | .func = atalk_rcv, |
1938 | }; | |
1939 | ||
1940 | static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; | |
1941 | ||
1942 | /* Export symbols for use by drivers when AppleTalk is a module */ | |
1da177e4 LT |
1943 | EXPORT_SYMBOL(atrtr_get_dev); |
1944 | EXPORT_SYMBOL(atalk_find_dev_addr); | |
1945 | ||
1da177e4 LT |
1946 | /* Called by proto.c on kernel start up */ |
1947 | static int __init atalk_init(void) | |
1948 | { | |
6377f787 | 1949 | int rc; |
1da177e4 | 1950 | |
6377f787 Y |
1951 | rc = proto_register(&ddp_proto, 0); |
1952 | if (rc) | |
1da177e4 LT |
1953 | goto out; |
1954 | ||
6377f787 Y |
1955 | rc = sock_register(&atalk_family_ops); |
1956 | if (rc) | |
1957 | goto out_proto; | |
1958 | ||
1da177e4 | 1959 | ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); |
9804501f Y |
1960 | if (!ddp_dl) { |
1961 | pr_crit("Unable to register DDP with SNAP.\n"); | |
c93ad133 | 1962 | rc = -ENOMEM; |
9804501f Y |
1963 | goto out_sock; |
1964 | } | |
1da177e4 LT |
1965 | |
1966 | dev_add_pack(<alk_packet_type); | |
1967 | dev_add_pack(&ppptalk_packet_type); | |
1968 | ||
6377f787 Y |
1969 | rc = register_netdevice_notifier(&ddp_notifier); |
1970 | if (rc) | |
9804501f Y |
1971 | goto out_snap; |
1972 | ||
1973 | rc = aarp_proto_init(); | |
1974 | if (rc) | |
1975 | goto out_dev; | |
6377f787 | 1976 | |
6377f787 Y |
1977 | rc = atalk_proc_init(); |
1978 | if (rc) | |
1979 | goto out_aarp; | |
1980 | ||
1981 | rc = atalk_register_sysctl(); | |
1982 | if (rc) | |
1983 | goto out_proc; | |
1da177e4 LT |
1984 | out: |
1985 | return rc; | |
6377f787 Y |
1986 | out_proc: |
1987 | atalk_proc_exit(); | |
1988 | out_aarp: | |
1989 | aarp_cleanup_module(); | |
9804501f | 1990 | out_dev: |
6377f787 | 1991 | unregister_netdevice_notifier(&ddp_notifier); |
9804501f | 1992 | out_snap: |
6377f787 Y |
1993 | dev_remove_pack(&ppptalk_packet_type); |
1994 | dev_remove_pack(<alk_packet_type); | |
1995 | unregister_snap_client(ddp_dl); | |
9804501f | 1996 | out_sock: |
6377f787 Y |
1997 | sock_unregister(PF_APPLETALK); |
1998 | out_proto: | |
1999 | proto_unregister(&ddp_proto); | |
2000 | goto out; | |
1da177e4 LT |
2001 | } |
2002 | module_init(atalk_init); | |
2003 | ||
2004 | /* | |
2005 | * No explicit module reference count manipulation is needed in the | |
2006 | * protocol. Socket layer sets module reference count for us | |
2007 | * and interfaces reference counting is done | |
2008 | * by the network device layer. | |
2009 | * | |
2010 | * Ergo, before the AppleTalk module can be removed, all AppleTalk | |
2011 | * sockets be closed from user space. | |
2012 | */ | |
2013 | static void __exit atalk_exit(void) | |
2014 | { | |
2015 | #ifdef CONFIG_SYSCTL | |
2016 | atalk_unregister_sysctl(); | |
2017 | #endif /* CONFIG_SYSCTL */ | |
2018 | atalk_proc_exit(); | |
2019 | aarp_cleanup_module(); /* General aarp clean-up. */ | |
2020 | unregister_netdevice_notifier(&ddp_notifier); | |
2021 | dev_remove_pack(<alk_packet_type); | |
2022 | dev_remove_pack(&ppptalk_packet_type); | |
2023 | unregister_snap_client(ddp_dl); | |
2024 | sock_unregister(PF_APPLETALK); | |
2025 | proto_unregister(&ddp_proto); | |
2026 | } | |
2027 | module_exit(atalk_exit); | |
2028 | ||
2029 | MODULE_LICENSE("GPL"); | |
113aa838 | 2030 | MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>"); |
1da177e4 LT |
2031 | MODULE_DESCRIPTION("AppleTalk 0.20\n"); |
2032 | MODULE_ALIAS_NETPROTO(PF_APPLETALK); |