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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 50397 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * DDP: An implementation of the AppleTalk DDP protocol for |
3 | * Ethernet 'ELAP'. |
4 | * |
5 | * Alan Cox <Alan.Cox@linux.org> |
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) |
31 | * Jay Schulist : Made work as module with |
32 | * AppleTalk drivers, cleaned it. |
33 | * Rob Newberry : Added proxy AARP and AARP |
34 | * procfs, moved probing to AARP |
35 | * module. |
36 | * Adrian Sun/ |
37 | * Michael Zuelsdorff : fix for net.0 packets. don't |
38 | * allow illegal ether/tokentalk |
39 | * port assignment. we lose a |
40 | * valid localtalk port as a |
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. |
51 | * |
52 | */ |
53 | |
54 | #include <linux/config.h> |
55 | #include <linux/module.h> |
56 | #include <linux/tcp.h> |
57 | #include <linux/if_arp.h> |
58 | #include <linux/termios.h> /* For TIOCOUTQ/INQ */ |
59 | #include <net/datalink.h> |
60 | #include <net/psnap.h> |
61 | #include <net/sock.h> |
62 | #include <net/route.h> |
63 | #include <linux/atalk.h> |
64 | |
65 | struct datalink_proto *ddp_dl, *aarp_dl; |
66 | static struct proto_ops atalk_dgram_ops; |
67 | |
68 | /**************************************************************************\ |
69 | * * |
70 | * Handlers for the socket list. * |
71 | * * |
72 | \**************************************************************************/ |
73 | |
74 | HLIST_HEAD(atalk_sockets); |
75 | DEFINE_RWLOCK(atalk_sockets_lock); |
76 | |
77 | static inline void __atalk_insert_socket(struct sock *sk) |
78 | { |
79 | sk_add_node(sk, &atalk_sockets); |
80 | } |
81 | |
82 | static inline void atalk_remove_socket(struct sock *sk) |
83 | { |
84 | write_lock_bh(&atalk_sockets_lock); |
85 | sk_del_node_init(sk); |
86 | write_unlock_bh(&atalk_sockets_lock); |
87 | } |
88 | |
89 | static struct sock *atalk_search_socket(struct sockaddr_at *to, |
90 | struct atalk_iface *atif) |
91 | { |
92 | struct sock *s; |
93 | struct hlist_node *node; |
94 | |
95 | read_lock_bh(&atalk_sockets_lock); |
96 | sk_for_each(s, node, &atalk_sockets) { |
97 | struct atalk_sock *at = at_sk(s); |
98 | |
99 | if (to->sat_port != at->src_port) |
100 | continue; |
101 | |
102 | if (to->sat_addr.s_net == ATADDR_ANYNET && |
103 | to->sat_addr.s_node == ATADDR_BCAST && |
104 | at->src_net == atif->address.s_net) |
105 | goto found; |
106 | |
107 | if (to->sat_addr.s_net == at->src_net && |
108 | (to->sat_addr.s_node == at->src_node || |
109 | to->sat_addr.s_node == ATADDR_BCAST || |
110 | to->sat_addr.s_node == ATADDR_ANYNODE)) |
111 | goto found; |
112 | |
113 | /* XXXX.0 -- we got a request for this router. make sure |
114 | * that the node is appropriately set. */ |
115 | if (to->sat_addr.s_node == ATADDR_ANYNODE && |
116 | to->sat_addr.s_net != ATADDR_ANYNET && |
117 | atif->address.s_node == at->src_node) { |
118 | to->sat_addr.s_node = atif->address.s_node; |
119 | goto found; |
120 | } |
121 | } |
122 | s = NULL; |
123 | found: |
124 | read_unlock_bh(&atalk_sockets_lock); |
125 | return s; |
126 | } |
127 | |
128 | /** |
129 | * atalk_find_or_insert_socket - Try to find a socket matching ADDR |
130 | * @sk - socket to insert in the list if it is not there already |
131 | * @sat - address to search for |
132 | * |
133 | * Try to find a socket matching ADDR in the socket list, if found then return |
134 | * it. If not, insert SK into the socket list. |
135 | * |
136 | * This entire operation must execute atomically. |
137 | */ |
138 | static struct sock *atalk_find_or_insert_socket(struct sock *sk, |
139 | struct sockaddr_at *sat) |
140 | { |
141 | struct sock *s; |
142 | struct hlist_node *node; |
143 | struct atalk_sock *at; |
144 | |
145 | write_lock_bh(&atalk_sockets_lock); |
146 | sk_for_each(s, node, &atalk_sockets) { |
147 | at = at_sk(s); |
148 | |
149 | if (at->src_net == sat->sat_addr.s_net && |
150 | at->src_node == sat->sat_addr.s_node && |
151 | at->src_port == sat->sat_port) |
152 | goto found; |
153 | } |
154 | s = NULL; |
155 | __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */ |
156 | found: |
157 | write_unlock_bh(&atalk_sockets_lock); |
158 | return s; |
159 | } |
160 | |
161 | static void atalk_destroy_timer(unsigned long data) |
162 | { |
163 | struct sock *sk = (struct sock *)data; |
164 | |
165 | if (atomic_read(&sk->sk_wmem_alloc) || |
166 | atomic_read(&sk->sk_rmem_alloc)) { |
167 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
168 | add_timer(&sk->sk_timer); |
169 | } else |
170 | sock_put(sk); |
171 | } |
172 | |
173 | static inline void atalk_destroy_socket(struct sock *sk) |
174 | { |
175 | atalk_remove_socket(sk); |
176 | skb_queue_purge(&sk->sk_receive_queue); |
177 | |
178 | if (atomic_read(&sk->sk_wmem_alloc) || |
179 | atomic_read(&sk->sk_rmem_alloc)) { |
180 | init_timer(&sk->sk_timer); |
181 | sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; |
182 | sk->sk_timer.function = atalk_destroy_timer; |
183 | sk->sk_timer.data = (unsigned long)sk; |
184 | add_timer(&sk->sk_timer); |
185 | } else |
186 | sock_put(sk); |
187 | } |
188 | |
189 | /**************************************************************************\ |
190 | * * |
191 | * Routing tables for the AppleTalk socket layer. * |
192 | * * |
193 | \**************************************************************************/ |
194 | |
195 | /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ |
196 | struct atalk_route *atalk_routes; |
197 | DEFINE_RWLOCK(atalk_routes_lock); |
198 | |
199 | struct atalk_iface *atalk_interfaces; |
200 | DEFINE_RWLOCK(atalk_interfaces_lock); |
201 | |
202 | /* For probing devices or in a routerless network */ |
203 | struct atalk_route atrtr_default; |
204 | |
205 | /* AppleTalk interface control */ |
206 | /* |
207 | * Drop a device. Doesn't drop any of its routes - that is the caller's |
208 | * problem. Called when we down the interface or delete the address. |
209 | */ |
210 | static void atif_drop_device(struct net_device *dev) |
211 | { |
212 | struct atalk_iface **iface = &atalk_interfaces; |
213 | struct atalk_iface *tmp; |
214 | |
215 | write_lock_bh(&atalk_interfaces_lock); |
216 | while ((tmp = *iface) != NULL) { |
217 | if (tmp->dev == dev) { |
218 | *iface = tmp->next; |
219 | dev_put(dev); |
220 | kfree(tmp); |
221 | dev->atalk_ptr = NULL; |
222 | } else |
223 | iface = &tmp->next; |
224 | } |
225 | write_unlock_bh(&atalk_interfaces_lock); |
226 | } |
227 | |
228 | static struct atalk_iface *atif_add_device(struct net_device *dev, |
229 | struct atalk_addr *sa) |
230 | { |
231 | struct atalk_iface *iface = kmalloc(sizeof(*iface), GFP_KERNEL); |
232 | |
233 | if (!iface) |
234 | goto out; |
235 | |
236 | memset(iface, 0, sizeof(*iface)); |
237 | dev_hold(dev); |
238 | iface->dev = dev; |
239 | dev->atalk_ptr = iface; |
240 | iface->address = *sa; |
241 | iface->status = 0; |
242 | |
243 | write_lock_bh(&atalk_interfaces_lock); |
244 | iface->next = atalk_interfaces; |
245 | atalk_interfaces = iface; |
246 | write_unlock_bh(&atalk_interfaces_lock); |
247 | out: |
248 | return iface; |
249 | } |
250 | |
251 | /* Perform phase 2 AARP probing on our tentative address */ |
252 | static int atif_probe_device(struct atalk_iface *atif) |
253 | { |
254 | int netrange = ntohs(atif->nets.nr_lastnet) - |
255 | ntohs(atif->nets.nr_firstnet) + 1; |
256 | int probe_net = ntohs(atif->address.s_net); |
257 | int probe_node = atif->address.s_node; |
258 | int netct, nodect; |
259 | |
260 | /* Offset the network we start probing with */ |
261 | if (probe_net == ATADDR_ANYNET) { |
262 | probe_net = ntohs(atif->nets.nr_firstnet); |
263 | if (netrange) |
264 | probe_net += jiffies % netrange; |
265 | } |
266 | if (probe_node == ATADDR_ANYNODE) |
267 | probe_node = jiffies & 0xFF; |
268 | |
269 | /* Scan the networks */ |
270 | atif->status |= ATIF_PROBE; |
271 | for (netct = 0; netct <= netrange; netct++) { |
272 | /* Sweep the available nodes from a given start */ |
273 | atif->address.s_net = htons(probe_net); |
274 | for (nodect = 0; nodect < 256; nodect++) { |
275 | atif->address.s_node = (nodect + probe_node) & 0xFF; |
276 | if (atif->address.s_node > 0 && |
277 | atif->address.s_node < 254) { |
278 | /* Probe a proposed address */ |
279 | aarp_probe_network(atif); |
280 | |
281 | if (!(atif->status & ATIF_PROBE_FAIL)) { |
282 | atif->status &= ~ATIF_PROBE; |
283 | return 0; |
284 | } |
285 | } |
286 | atif->status &= ~ATIF_PROBE_FAIL; |
287 | } |
288 | probe_net++; |
289 | if (probe_net > ntohs(atif->nets.nr_lastnet)) |
290 | probe_net = ntohs(atif->nets.nr_firstnet); |
291 | } |
292 | atif->status &= ~ATIF_PROBE; |
293 | |
294 | return -EADDRINUSE; /* Network is full... */ |
295 | } |
296 | |
297 | |
298 | /* Perform AARP probing for a proxy address */ |
299 | static int atif_proxy_probe_device(struct atalk_iface *atif, |
300 | struct atalk_addr* proxy_addr) |
301 | { |
302 | int netrange = ntohs(atif->nets.nr_lastnet) - |
303 | ntohs(atif->nets.nr_firstnet) + 1; |
304 | /* we probe the interface's network */ |
305 | int probe_net = ntohs(atif->address.s_net); |
306 | int probe_node = ATADDR_ANYNODE; /* we'll take anything */ |
307 | int netct, nodect; |
308 | |
309 | /* Offset the network we start probing with */ |
310 | if (probe_net == ATADDR_ANYNET) { |
311 | probe_net = ntohs(atif->nets.nr_firstnet); |
312 | if (netrange) |
313 | probe_net += jiffies % netrange; |
314 | } |
315 | |
316 | if (probe_node == ATADDR_ANYNODE) |
317 | probe_node = jiffies & 0xFF; |
318 | |
319 | /* Scan the networks */ |
320 | for (netct = 0; netct <= netrange; netct++) { |
321 | /* Sweep the available nodes from a given start */ |
322 | proxy_addr->s_net = htons(probe_net); |
323 | for (nodect = 0; nodect < 256; nodect++) { |
324 | proxy_addr->s_node = (nodect + probe_node) & 0xFF; |
325 | if (proxy_addr->s_node > 0 && |
326 | proxy_addr->s_node < 254) { |
327 | /* Tell AARP to probe a proposed address */ |
328 | int ret = aarp_proxy_probe_network(atif, |
329 | proxy_addr); |
330 | |
331 | if (ret != -EADDRINUSE) |
332 | return ret; |
333 | } |
334 | } |
335 | probe_net++; |
336 | if (probe_net > ntohs(atif->nets.nr_lastnet)) |
337 | probe_net = ntohs(atif->nets.nr_firstnet); |
338 | } |
339 | |
340 | return -EADDRINUSE; /* Network is full... */ |
341 | } |
342 | |
343 | |
344 | struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) |
345 | { |
346 | struct atalk_iface *iface = dev->atalk_ptr; |
347 | return iface ? &iface->address : NULL; |
348 | } |
349 | |
350 | static struct atalk_addr *atalk_find_primary(void) |
351 | { |
352 | struct atalk_iface *fiface = NULL; |
353 | struct atalk_addr *retval; |
354 | struct atalk_iface *iface; |
355 | |
356 | /* |
357 | * Return a point-to-point interface only if |
358 | * there is no non-ptp interface available. |
359 | */ |
360 | read_lock_bh(&atalk_interfaces_lock); |
361 | for (iface = atalk_interfaces; iface; iface = iface->next) { |
362 | if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) |
363 | fiface = iface; |
364 | if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { |
365 | retval = &iface->address; |
366 | goto out; |
367 | } |
368 | } |
369 | |
370 | if (fiface) |
371 | retval = &fiface->address; |
372 | else if (atalk_interfaces) |
373 | retval = &atalk_interfaces->address; |
374 | else |
375 | retval = NULL; |
376 | out: |
377 | read_unlock_bh(&atalk_interfaces_lock); |
378 | return retval; |
379 | } |
380 | |
381 | /* |
382 | * Find a match for 'any network' - ie any of our interfaces with that |
383 | * node number will do just nicely. |
384 | */ |
385 | static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) |
386 | { |
387 | struct atalk_iface *iface = dev->atalk_ptr; |
388 | |
389 | if (!iface || iface->status & ATIF_PROBE) |
390 | goto out_err; |
391 | |
392 | if (node != ATADDR_BCAST && |
393 | iface->address.s_node != node && |
394 | node != ATADDR_ANYNODE) |
395 | goto out_err; |
396 | out: |
397 | return iface; |
398 | out_err: |
399 | iface = NULL; |
400 | goto out; |
401 | } |
402 | |
403 | /* Find a match for a specific network:node pair */ |
404 | static struct atalk_iface *atalk_find_interface(int net, int node) |
405 | { |
406 | struct atalk_iface *iface; |
407 | |
408 | read_lock_bh(&atalk_interfaces_lock); |
409 | for (iface = atalk_interfaces; iface; iface = iface->next) { |
410 | if ((node == ATADDR_BCAST || |
411 | node == ATADDR_ANYNODE || |
412 | iface->address.s_node == node) && |
413 | iface->address.s_net == net && |
414 | !(iface->status & ATIF_PROBE)) |
415 | break; |
416 | |
417 | /* XXXX.0 -- net.0 returns the iface associated with net */ |
418 | if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && |
419 | ntohs(iface->nets.nr_firstnet) <= ntohs(net) && |
420 | ntohs(net) <= ntohs(iface->nets.nr_lastnet)) |
421 | break; |
422 | } |
423 | read_unlock_bh(&atalk_interfaces_lock); |
424 | return iface; |
425 | } |
426 | |
427 | |
428 | /* |
429 | * Find a route for an AppleTalk packet. This ought to get cached in |
430 | * the socket (later on...). We know about host routes and the fact |
431 | * that a route must be direct to broadcast. |
432 | */ |
433 | static struct atalk_route *atrtr_find(struct atalk_addr *target) |
434 | { |
435 | /* |
436 | * we must search through all routes unless we find a |
437 | * host route, because some host routes might overlap |
438 | * network routes |
439 | */ |
440 | struct atalk_route *net_route = NULL; |
441 | struct atalk_route *r; |
442 | |
443 | read_lock_bh(&atalk_routes_lock); |
444 | for (r = atalk_routes; r; r = r->next) { |
445 | if (!(r->flags & RTF_UP)) |
446 | continue; |
447 | |
448 | if (r->target.s_net == target->s_net) { |
449 | if (r->flags & RTF_HOST) { |
450 | /* |
451 | * if this host route is for the target, |
452 | * the we're done |
453 | */ |
454 | if (r->target.s_node == target->s_node) |
455 | goto out; |
456 | } else |
457 | /* |
458 | * this route will work if there isn't a |
459 | * direct host route, so cache it |
460 | */ |
461 | net_route = r; |
462 | } |
463 | } |
464 | |
465 | /* |
466 | * if we found a network route but not a direct host |
467 | * route, then return it |
468 | */ |
469 | if (net_route) |
470 | r = net_route; |
471 | else if (atrtr_default.dev) |
472 | r = &atrtr_default; |
473 | else /* No route can be found */ |
474 | r = NULL; |
475 | out: |
476 | read_unlock_bh(&atalk_routes_lock); |
477 | return r; |
478 | } |
479 | |
480 | |
481 | /* |
482 | * Given an AppleTalk network, find the device to use. This can be |
483 | * a simple lookup. |
484 | */ |
485 | struct net_device *atrtr_get_dev(struct atalk_addr *sa) |
486 | { |
487 | struct atalk_route *atr = atrtr_find(sa); |
488 | return atr ? atr->dev : NULL; |
489 | } |
490 | |
491 | /* Set up a default router */ |
492 | static void atrtr_set_default(struct net_device *dev) |
493 | { |
494 | atrtr_default.dev = dev; |
495 | atrtr_default.flags = RTF_UP; |
496 | atrtr_default.gateway.s_net = htons(0); |
497 | atrtr_default.gateway.s_node = 0; |
498 | } |
499 | |
500 | /* |
501 | * Add a router. Basically make sure it looks valid and stuff the |
502 | * entry in the list. While it uses netranges we always set them to one |
503 | * entry to work like netatalk. |
504 | */ |
505 | static int atrtr_create(struct rtentry *r, struct net_device *devhint) |
506 | { |
507 | struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; |
508 | struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; |
509 | struct atalk_route *rt; |
510 | struct atalk_iface *iface, *riface; |
511 | int retval = -EINVAL; |
512 | |
513 | /* |
514 | * Fixme: Raise/Lower a routing change semaphore for these |
515 | * operations. |
516 | */ |
517 | |
518 | /* Validate the request */ |
519 | if (ta->sat_family != AF_APPLETALK || |
520 | (!devhint && ga->sat_family != AF_APPLETALK)) |
521 | goto out; |
522 | |
523 | /* Now walk the routing table and make our decisions */ |
524 | write_lock_bh(&atalk_routes_lock); |
525 | for (rt = atalk_routes; rt; rt = rt->next) { |
526 | if (r->rt_flags != rt->flags) |
527 | continue; |
528 | |
529 | if (ta->sat_addr.s_net == rt->target.s_net) { |
530 | if (!(rt->flags & RTF_HOST)) |
531 | break; |
532 | if (ta->sat_addr.s_node == rt->target.s_node) |
533 | break; |
534 | } |
535 | } |
536 | |
537 | if (!devhint) { |
538 | riface = NULL; |
539 | |
540 | read_lock_bh(&atalk_interfaces_lock); |
541 | for (iface = atalk_interfaces; iface; iface = iface->next) { |
542 | if (!riface && |
543 | ntohs(ga->sat_addr.s_net) >= |
544 | ntohs(iface->nets.nr_firstnet) && |
545 | ntohs(ga->sat_addr.s_net) <= |
546 | ntohs(iface->nets.nr_lastnet)) |
547 | riface = iface; |
548 | |
549 | if (ga->sat_addr.s_net == iface->address.s_net && |
550 | ga->sat_addr.s_node == iface->address.s_node) |
551 | riface = iface; |
552 | } |
553 | read_unlock_bh(&atalk_interfaces_lock); |
554 | |
555 | retval = -ENETUNREACH; |
556 | if (!riface) |
557 | goto out_unlock; |
558 | |
559 | devhint = riface->dev; |
560 | } |
561 | |
562 | if (!rt) { |
563 | rt = kmalloc(sizeof(*rt), GFP_ATOMIC); |
564 | |
565 | retval = -ENOBUFS; |
566 | if (!rt) |
567 | goto out_unlock; |
568 | memset(rt, 0, sizeof(*rt)); |
569 | |
570 | rt->next = atalk_routes; |
571 | atalk_routes = rt; |
572 | } |
573 | |
574 | /* Fill in the routing entry */ |
575 | rt->target = ta->sat_addr; |
576 | dev_hold(devhint); |
577 | rt->dev = devhint; |
578 | rt->flags = r->rt_flags; |
579 | rt->gateway = ga->sat_addr; |
580 | |
581 | retval = 0; |
582 | out_unlock: |
583 | write_unlock_bh(&atalk_routes_lock); |
584 | out: |
585 | return retval; |
586 | } |
587 | |
588 | /* Delete a route. Find it and discard it */ |
589 | static int atrtr_delete(struct atalk_addr * addr) |
590 | { |
591 | struct atalk_route **r = &atalk_routes; |
592 | int retval = 0; |
593 | struct atalk_route *tmp; |
594 | |
595 | write_lock_bh(&atalk_routes_lock); |
596 | while ((tmp = *r) != NULL) { |
597 | if (tmp->target.s_net == addr->s_net && |
598 | (!(tmp->flags&RTF_GATEWAY) || |
599 | tmp->target.s_node == addr->s_node)) { |
600 | *r = tmp->next; |
601 | dev_put(tmp->dev); |
602 | kfree(tmp); |
603 | goto out; |
604 | } |
605 | r = &tmp->next; |
606 | } |
607 | retval = -ENOENT; |
608 | out: |
609 | write_unlock_bh(&atalk_routes_lock); |
610 | return retval; |
611 | } |
612 | |
613 | /* |
614 | * Called when a device is downed. Just throw away any routes |
615 | * via it. |
616 | */ |
617 | static void atrtr_device_down(struct net_device *dev) |
618 | { |
619 | struct atalk_route **r = &atalk_routes; |
620 | struct atalk_route *tmp; |
621 | |
622 | write_lock_bh(&atalk_routes_lock); |
623 | while ((tmp = *r) != NULL) { |
624 | if (tmp->dev == dev) { |
625 | *r = tmp->next; |
626 | dev_put(dev); |
627 | kfree(tmp); |
628 | } else |
629 | r = &tmp->next; |
630 | } |
631 | write_unlock_bh(&atalk_routes_lock); |
632 | |
633 | if (atrtr_default.dev == dev) |
634 | atrtr_set_default(NULL); |
635 | } |
636 | |
637 | /* Actually down the interface */ |
638 | static inline void atalk_dev_down(struct net_device *dev) |
639 | { |
640 | atrtr_device_down(dev); /* Remove all routes for the device */ |
641 | aarp_device_down(dev); /* Remove AARP entries for the device */ |
642 | atif_drop_device(dev); /* Remove the device */ |
643 | } |
644 | |
645 | /* |
646 | * A device event has occurred. Watch for devices going down and |
647 | * delete our use of them (iface and route). |
648 | */ |
649 | static int ddp_device_event(struct notifier_block *this, unsigned long event, |
650 | void *ptr) |
651 | { |
652 | if (event == NETDEV_DOWN) |
653 | /* Discard any use of this */ |
654 | atalk_dev_down(ptr); |
655 | |
656 | return NOTIFY_DONE; |
657 | } |
658 | |
659 | /* ioctl calls. Shouldn't even need touching */ |
660 | /* Device configuration ioctl calls */ |
661 | static int atif_ioctl(int cmd, void __user *arg) |
662 | { |
663 | static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; |
664 | struct ifreq atreq; |
665 | struct atalk_netrange *nr; |
666 | struct sockaddr_at *sa; |
667 | struct net_device *dev; |
668 | struct atalk_iface *atif; |
669 | int ct; |
670 | int limit; |
671 | struct rtentry rtdef; |
672 | int add_route; |
673 | |
674 | if (copy_from_user(&atreq, arg, sizeof(atreq))) |
675 | return -EFAULT; |
676 | |
677 | dev = __dev_get_by_name(atreq.ifr_name); |
678 | if (!dev) |
679 | return -ENODEV; |
680 | |
681 | sa = (struct sockaddr_at *)&atreq.ifr_addr; |
682 | atif = atalk_find_dev(dev); |
683 | |
684 | switch (cmd) { |
685 | case SIOCSIFADDR: |
686 | if (!capable(CAP_NET_ADMIN)) |
687 | return -EPERM; |
688 | if (sa->sat_family != AF_APPLETALK) |
689 | return -EINVAL; |
690 | if (dev->type != ARPHRD_ETHER && |
691 | dev->type != ARPHRD_LOOPBACK && |
692 | dev->type != ARPHRD_LOCALTLK && |
693 | dev->type != ARPHRD_PPP) |
694 | return -EPROTONOSUPPORT; |
695 | |
696 | nr = (struct atalk_netrange *)&sa->sat_zero[0]; |
697 | add_route = 1; |
698 | |
699 | /* |
700 | * if this is a point-to-point iface, and we already |
701 | * have an iface for this AppleTalk address, then we |
702 | * should not add a route |
703 | */ |
704 | if ((dev->flags & IFF_POINTOPOINT) && |
705 | atalk_find_interface(sa->sat_addr.s_net, |
706 | sa->sat_addr.s_node)) { |
707 | printk(KERN_DEBUG "AppleTalk: point-to-point " |
708 | "interface added with " |
709 | "existing address\n"); |
710 | add_route = 0; |
711 | } |
712 | |
713 | /* |
714 | * Phase 1 is fine on LocalTalk but we don't do |
715 | * EtherTalk phase 1. Anyone wanting to add it go ahead. |
716 | */ |
717 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) |
718 | return -EPROTONOSUPPORT; |
719 | if (sa->sat_addr.s_node == ATADDR_BCAST || |
720 | sa->sat_addr.s_node == 254) |
721 | return -EINVAL; |
722 | if (atif) { |
723 | /* Already setting address */ |
724 | if (atif->status & ATIF_PROBE) |
725 | return -EBUSY; |
726 | |
727 | atif->address.s_net = sa->sat_addr.s_net; |
728 | atif->address.s_node = sa->sat_addr.s_node; |
729 | atrtr_device_down(dev); /* Flush old routes */ |
730 | } else { |
731 | atif = atif_add_device(dev, &sa->sat_addr); |
732 | if (!atif) |
733 | return -ENOMEM; |
734 | } |
735 | atif->nets = *nr; |
736 | |
737 | /* |
738 | * Check if the chosen address is used. If so we |
739 | * error and atalkd will try another. |
740 | */ |
741 | |
742 | if (!(dev->flags & IFF_LOOPBACK) && |
743 | !(dev->flags & IFF_POINTOPOINT) && |
744 | atif_probe_device(atif) < 0) { |
745 | atif_drop_device(dev); |
746 | return -EADDRINUSE; |
747 | } |
748 | |
749 | /* Hey it worked - add the direct routes */ |
750 | sa = (struct sockaddr_at *)&rtdef.rt_gateway; |
751 | sa->sat_family = AF_APPLETALK; |
752 | sa->sat_addr.s_net = atif->address.s_net; |
753 | sa->sat_addr.s_node = atif->address.s_node; |
754 | sa = (struct sockaddr_at *)&rtdef.rt_dst; |
755 | rtdef.rt_flags = RTF_UP; |
756 | sa->sat_family = AF_APPLETALK; |
757 | sa->sat_addr.s_node = ATADDR_ANYNODE; |
758 | if (dev->flags & IFF_LOOPBACK || |
759 | dev->flags & IFF_POINTOPOINT) |
760 | rtdef.rt_flags |= RTF_HOST; |
761 | |
762 | /* Routerless initial state */ |
763 | if (nr->nr_firstnet == htons(0) && |
764 | nr->nr_lastnet == htons(0xFFFE)) { |
765 | sa->sat_addr.s_net = atif->address.s_net; |
766 | atrtr_create(&rtdef, dev); |
767 | atrtr_set_default(dev); |
768 | } else { |
769 | limit = ntohs(nr->nr_lastnet); |
770 | if (limit - ntohs(nr->nr_firstnet) > 4096) { |
771 | printk(KERN_WARNING "Too many routes/" |
772 | "iface.\n"); |
773 | return -EINVAL; |
774 | } |
775 | if (add_route) |
776 | for (ct = ntohs(nr->nr_firstnet); |
777 | ct <= limit; ct++) { |
778 | sa->sat_addr.s_net = htons(ct); |
779 | atrtr_create(&rtdef, dev); |
780 | } |
781 | } |
782 | dev_mc_add(dev, aarp_mcast, 6, 1); |
783 | return 0; |
784 | |
785 | case SIOCGIFADDR: |
786 | if (!atif) |
787 | return -EADDRNOTAVAIL; |
788 | |
789 | sa->sat_family = AF_APPLETALK; |
790 | sa->sat_addr = atif->address; |
791 | break; |
792 | |
793 | case SIOCGIFBRDADDR: |
794 | if (!atif) |
795 | return -EADDRNOTAVAIL; |
796 | |
797 | sa->sat_family = AF_APPLETALK; |
798 | sa->sat_addr.s_net = atif->address.s_net; |
799 | sa->sat_addr.s_node = ATADDR_BCAST; |
800 | break; |
801 | |
802 | case SIOCATALKDIFADDR: |
803 | case SIOCDIFADDR: |
804 | if (!capable(CAP_NET_ADMIN)) |
805 | return -EPERM; |
806 | if (sa->sat_family != AF_APPLETALK) |
807 | return -EINVAL; |
808 | atalk_dev_down(dev); |
809 | break; |
810 | |
811 | case SIOCSARP: |
812 | if (!capable(CAP_NET_ADMIN)) |
813 | return -EPERM; |
814 | if (sa->sat_family != AF_APPLETALK) |
815 | return -EINVAL; |
816 | if (!atif) |
817 | return -EADDRNOTAVAIL; |
818 | |
819 | /* |
820 | * for now, we only support proxy AARP on ELAP; |
821 | * we should be able to do it for LocalTalk, too. |
822 | */ |
823 | if (dev->type != ARPHRD_ETHER) |
824 | return -EPROTONOSUPPORT; |
825 | |
826 | /* |
827 | * atif points to the current interface on this network; |
828 | * we aren't concerned about its current status (at |
829 | * least for now), but it has all the settings about |
830 | * the network we're going to probe. Consequently, it |
831 | * must exist. |
832 | */ |
833 | if (!atif) |
834 | return -EADDRNOTAVAIL; |
835 | |
836 | nr = (struct atalk_netrange *)&(atif->nets); |
837 | /* |
838 | * Phase 1 is fine on Localtalk but we don't do |
839 | * Ethertalk phase 1. Anyone wanting to add it go ahead. |
840 | */ |
841 | if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) |
842 | return -EPROTONOSUPPORT; |
843 | |
844 | if (sa->sat_addr.s_node == ATADDR_BCAST || |
845 | sa->sat_addr.s_node == 254) |
846 | return -EINVAL; |
847 | |
848 | /* |
849 | * Check if the chosen address is used. If so we |
850 | * error and ATCP will try another. |
851 | */ |
852 | if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) |
853 | return -EADDRINUSE; |
854 | |
855 | /* |
856 | * We now have an address on the local network, and |
857 | * the AARP code will defend it for us until we take it |
858 | * down. We don't set up any routes right now, because |
859 | * ATCP will install them manually via SIOCADDRT. |
860 | */ |
861 | break; |
862 | |
863 | case SIOCDARP: |
864 | if (!capable(CAP_NET_ADMIN)) |
865 | return -EPERM; |
866 | if (sa->sat_family != AF_APPLETALK) |
867 | return -EINVAL; |
868 | if (!atif) |
869 | return -EADDRNOTAVAIL; |
870 | |
871 | /* give to aarp module to remove proxy entry */ |
872 | aarp_proxy_remove(atif->dev, &(sa->sat_addr)); |
873 | return 0; |
874 | } |
875 | |
876 | return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; |
877 | } |
878 | |
879 | /* Routing ioctl() calls */ |
880 | static int atrtr_ioctl(unsigned int cmd, void __user *arg) |
881 | { |
882 | struct rtentry rt; |
883 | |
884 | if (copy_from_user(&rt, arg, sizeof(rt))) |
885 | return -EFAULT; |
886 | |
887 | switch (cmd) { |
888 | case SIOCDELRT: |
889 | if (rt.rt_dst.sa_family != AF_APPLETALK) |
890 | return -EINVAL; |
891 | return atrtr_delete(&((struct sockaddr_at *) |
892 | &rt.rt_dst)->sat_addr); |
893 | |
894 | case SIOCADDRT: { |
895 | struct net_device *dev = NULL; |
896 | if (rt.rt_dev) { |
897 | char name[IFNAMSIZ]; |
898 | if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1)) |
899 | return -EFAULT; |
900 | name[IFNAMSIZ-1] = '\0'; |
901 | dev = __dev_get_by_name(name); |
902 | if (!dev) |
903 | return -ENODEV; |
904 | } |
905 | return atrtr_create(&rt, dev); |
906 | } |
907 | } |
908 | return -EINVAL; |
909 | } |
910 | |
911 | /**************************************************************************\ |
912 | * * |
913 | * Handling for system calls applied via the various interfaces to an * |
914 | * AppleTalk socket object. * |
915 | * * |
916 | \**************************************************************************/ |
917 | |
918 | /* |
919 | * Checksum: This is 'optional'. It's quite likely also a good |
920 | * candidate for assembler hackery 8) |
921 | */ |
922 | static unsigned long atalk_sum_partial(const unsigned char *data, |
923 | int len, unsigned long sum) |
924 | { |
925 | /* This ought to be unwrapped neatly. I'll trust gcc for now */ |
926 | while (len--) { |
927 | sum += *data; |
928 | sum <<= 1; |
929 | if (sum & 0x10000) { |
930 | sum++; |
931 | sum &= 0xffff; |
932 | } |
933 | data++; |
934 | } |
935 | return sum; |
936 | } |
937 | |
938 | /* Checksum skb data -- similar to skb_checksum */ |
939 | static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, |
940 | int len, unsigned long sum) |
941 | { |
942 | int start = skb_headlen(skb); |
943 | int i, copy; |
944 | |
945 | /* checksum stuff in header space */ |
946 | if ( (copy = start - offset) > 0) { |
947 | if (copy > len) |
948 | copy = len; |
949 | sum = atalk_sum_partial(skb->data + offset, copy, sum); |
950 | if ( (len -= copy) == 0) |
951 | return sum; |
952 | |
953 | offset += copy; |
954 | } |
955 | |
956 | /* checksum stuff in frags */ |
957 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
958 | int end; |
959 | |
960 | BUG_TRAP(start <= offset + len); |
961 | |
962 | end = start + skb_shinfo(skb)->frags[i].size; |
963 | if ((copy = end - offset) > 0) { |
964 | u8 *vaddr; |
965 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
966 | |
967 | if (copy > len) |
968 | copy = len; |
969 | vaddr = kmap_skb_frag(frag); |
970 | sum = atalk_sum_partial(vaddr + frag->page_offset + |
971 | offset - start, copy, sum); |
972 | kunmap_skb_frag(vaddr); |
973 | |
974 | if (!(len -= copy)) |
975 | return sum; |
976 | offset += copy; |
977 | } |
978 | start = end; |
979 | } |
980 | |
981 | if (skb_shinfo(skb)->frag_list) { |
982 | struct sk_buff *list = skb_shinfo(skb)->frag_list; |
983 | |
984 | for (; list; list = list->next) { |
985 | int end; |
986 | |
987 | BUG_TRAP(start <= offset + len); |
988 | |
989 | end = start + list->len; |
990 | if ((copy = end - offset) > 0) { |
991 | if (copy > len) |
992 | copy = len; |
993 | sum = atalk_sum_skb(list, offset - start, |
994 | copy, sum); |
995 | if ((len -= copy) == 0) |
996 | return sum; |
997 | offset += copy; |
998 | } |
999 | start = end; |
1000 | } |
1001 | } |
1002 | |
1003 | BUG_ON(len > 0); |
1004 | |
1005 | return sum; |
1006 | } |
1007 | |
1008 | static unsigned short atalk_checksum(const struct sk_buff *skb, int len) |
1009 | { |
1010 | unsigned long sum; |
1011 | |
1012 | /* skip header 4 bytes */ |
1013 | sum = atalk_sum_skb(skb, 4, len-4, 0); |
1014 | |
1015 | /* Use 0xFFFF for 0. 0 itself means none */ |
1016 | return sum ? htons((unsigned short)sum) : 0xFFFF; |
1017 | } |
1018 | |
1019 | static struct proto ddp_proto = { |
1020 | .name = "DDP", |
1021 | .owner = THIS_MODULE, |
1022 | .obj_size = sizeof(struct atalk_sock), |
1023 | }; |
1024 | |
1025 | /* |
1026 | * Create a socket. Initialise the socket, blank the addresses |
1027 | * set the state. |
1028 | */ |
1029 | static int atalk_create(struct socket *sock, int protocol) |
1030 | { |
1031 | struct sock *sk; |
1032 | int rc = -ESOCKTNOSUPPORT; |
1033 | |
1034 | /* |
1035 | * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do |
1036 | * and gives you the full ELAP frame. Should be handy for CAP 8) |
1037 | */ |
1038 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) |
1039 | goto out; |
1040 | rc = -ENOMEM; |
1041 | sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1); |
1042 | if (!sk) |
1043 | goto out; |
1044 | rc = 0; |
1045 | sock->ops = &atalk_dgram_ops; |
1046 | sock_init_data(sock, sk); |
1047 | |
1048 | /* Checksums on by default */ |
1049 | sock_set_flag(sk, SOCK_ZAPPED); |
1050 | out: |
1051 | return rc; |
1052 | } |
1053 | |
1054 | /* Free a socket. No work needed */ |
1055 | static int atalk_release(struct socket *sock) |
1056 | { |
1057 | struct sock *sk = sock->sk; |
1058 | |
1059 | if (sk) { |
1060 | sock_orphan(sk); |
1061 | sock->sk = NULL; |
1062 | atalk_destroy_socket(sk); |
1063 | } |
1064 | return 0; |
1065 | } |
1066 | |
1067 | /** |
1068 | * atalk_pick_and_bind_port - Pick a source port when one is not given |
1069 | * @sk - socket to insert into the tables |
1070 | * @sat - address to search for |
1071 | * |
1072 | * Pick a source port when one is not given. If we can find a suitable free |
1073 | * one, we insert the socket into the tables using it. |
1074 | * |
1075 | * This whole operation must be atomic. |
1076 | */ |
1077 | static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat) |
1078 | { |
1079 | int retval; |
1080 | |
1081 | write_lock_bh(&atalk_sockets_lock); |
1082 | |
1083 | for (sat->sat_port = ATPORT_RESERVED; |
1084 | sat->sat_port < ATPORT_LAST; |
1085 | sat->sat_port++) { |
1086 | struct sock *s; |
1087 | struct hlist_node *node; |
1088 | |
1089 | sk_for_each(s, node, &atalk_sockets) { |
1090 | struct atalk_sock *at = at_sk(s); |
1091 | |
1092 | if (at->src_net == sat->sat_addr.s_net && |
1093 | at->src_node == sat->sat_addr.s_node && |
1094 | at->src_port == sat->sat_port) |
1095 | goto try_next_port; |
1096 | } |
1097 | |
1098 | /* Wheee, it's free, assign and insert. */ |
1099 | __atalk_insert_socket(sk); |
1100 | at_sk(sk)->src_port = sat->sat_port; |
1101 | retval = 0; |
1102 | goto out; |
1103 | |
1104 | try_next_port:; |
1105 | } |
1106 | |
1107 | retval = -EBUSY; |
1108 | out: |
1109 | write_unlock_bh(&atalk_sockets_lock); |
1110 | return retval; |
1111 | } |
1112 | |
1113 | static int atalk_autobind(struct sock *sk) |
1114 | { |
1115 | struct atalk_sock *at = at_sk(sk); |
1116 | struct sockaddr_at sat; |
1117 | struct atalk_addr *ap = atalk_find_primary(); |
1118 | int n = -EADDRNOTAVAIL; |
1119 | |
1120 | if (!ap || ap->s_net == htons(ATADDR_ANYNET)) |
1121 | goto out; |
1122 | |
1123 | at->src_net = sat.sat_addr.s_net = ap->s_net; |
1124 | at->src_node = sat.sat_addr.s_node = ap->s_node; |
1125 | |
1126 | n = atalk_pick_and_bind_port(sk, &sat); |
1127 | if (!n) |
1128 | sock_reset_flag(sk, SOCK_ZAPPED); |
1129 | out: |
1130 | return n; |
1131 | } |
1132 | |
1133 | /* Set the address 'our end' of the connection */ |
1134 | static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
1135 | { |
1136 | struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; |
1137 | struct sock *sk = sock->sk; |
1138 | struct atalk_sock *at = at_sk(sk); |
1139 | |
1140 | if (!sock_flag(sk, SOCK_ZAPPED) || |
1141 | addr_len != sizeof(struct sockaddr_at)) |
1142 | return -EINVAL; |
1143 | |
1144 | if (addr->sat_family != AF_APPLETALK) |
1145 | return -EAFNOSUPPORT; |
1146 | |
1147 | if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { |
1148 | struct atalk_addr *ap = atalk_find_primary(); |
1149 | |
1150 | if (!ap) |
1151 | return -EADDRNOTAVAIL; |
1152 | |
1153 | at->src_net = addr->sat_addr.s_net = ap->s_net; |
1154 | at->src_node = addr->sat_addr.s_node= ap->s_node; |
1155 | } else { |
1156 | if (!atalk_find_interface(addr->sat_addr.s_net, |
1157 | addr->sat_addr.s_node)) |
1158 | return -EADDRNOTAVAIL; |
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) { |
1165 | int n = atalk_pick_and_bind_port(sk, addr); |
1166 | |
1167 | if (n < 0) |
1168 | return n; |
1169 | } else { |
1170 | at->src_port = addr->sat_port; |
1171 | |
1172 | if (atalk_find_or_insert_socket(sk, addr)) |
1173 | return -EADDRINUSE; |
1174 | } |
1175 | |
1176 | sock_reset_flag(sk, SOCK_ZAPPED); |
1177 | return 0; |
1178 | } |
1179 | |
1180 | /* Set the address we talk to */ |
1181 | static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, |
1182 | int addr_len, int flags) |
1183 | { |
1184 | struct sock *sk = sock->sk; |
1185 | struct atalk_sock *at = at_sk(sk); |
1186 | struct sockaddr_at *addr; |
1187 | |
1188 | sk->sk_state = TCP_CLOSE; |
1189 | sock->state = SS_UNCONNECTED; |
1190 | |
1191 | if (addr_len != sizeof(*addr)) |
1192 | return -EINVAL; |
1193 | |
1194 | addr = (struct sockaddr_at *)uaddr; |
1195 | |
1196 | if (addr->sat_family != AF_APPLETALK) |
1197 | return -EAFNOSUPPORT; |
1198 | |
1199 | if (addr->sat_addr.s_node == ATADDR_BCAST && |
1200 | !sock_flag(sk, SOCK_BROADCAST)) { |
1201 | #if 1 |
1202 | printk(KERN_WARNING "%s is broken and did not set " |
1203 | "SO_BROADCAST. It will break when 2.2 is " |
1204 | "released.\n", |
1205 | current->comm); |
1206 | #else |
1207 | return -EACCES; |
1208 | #endif |
1209 | } |
1210 | |
1211 | if (sock_flag(sk, SOCK_ZAPPED)) |
1212 | if (atalk_autobind(sk) < 0) |
1213 | return -EBUSY; |
1214 | |
1215 | if (!atrtr_get_dev(&addr->sat_addr)) |
1216 | return -ENETUNREACH; |
1217 | |
1218 | at->dest_port = addr->sat_port; |
1219 | at->dest_net = addr->sat_addr.s_net; |
1220 | at->dest_node = addr->sat_addr.s_node; |
1221 | |
1222 | sock->state = SS_CONNECTED; |
1223 | sk->sk_state = TCP_ESTABLISHED; |
1224 | return 0; |
1225 | } |
1226 | |
1227 | /* |
1228 | * Find the name of an AppleTalk socket. Just copy the right |
1229 | * fields into the sockaddr. |
1230 | */ |
1231 | static int atalk_getname(struct socket *sock, struct sockaddr *uaddr, |
1232 | int *uaddr_len, int peer) |
1233 | { |
1234 | struct sockaddr_at sat; |
1235 | struct sock *sk = sock->sk; |
1236 | struct atalk_sock *at = at_sk(sk); |
1237 | |
1238 | if (sock_flag(sk, SOCK_ZAPPED)) |
1239 | if (atalk_autobind(sk) < 0) |
1240 | return -ENOBUFS; |
1241 | |
1242 | *uaddr_len = sizeof(struct sockaddr_at); |
1243 | |
1244 | if (peer) { |
1245 | if (sk->sk_state != TCP_ESTABLISHED) |
1246 | return -ENOTCONN; |
1247 | |
1248 | sat.sat_addr.s_net = at->dest_net; |
1249 | sat.sat_addr.s_node = at->dest_node; |
1250 | sat.sat_port = at->dest_port; |
1251 | } else { |
1252 | sat.sat_addr.s_net = at->src_net; |
1253 | sat.sat_addr.s_node = at->src_node; |
1254 | sat.sat_port = at->src_port; |
1255 | } |
1256 | |
1257 | sat.sat_family = AF_APPLETALK; |
1258 | memcpy(uaddr, &sat, sizeof(sat)); |
1259 | return 0; |
1260 | } |
1261 | |
1262 | #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE) |
1263 | static __inline__ int is_ip_over_ddp(struct sk_buff *skb) |
1264 | { |
1265 | return skb->data[12] == 22; |
1266 | } |
1267 | |
1268 | static int handle_ip_over_ddp(struct sk_buff *skb) |
1269 | { |
1270 | struct net_device *dev = __dev_get_by_name("ipddp0"); |
1271 | struct net_device_stats *stats; |
1272 | |
1273 | /* This needs to be able to handle ipddp"N" devices */ |
1274 | if (!dev) |
1275 | return -ENODEV; |
1276 | |
1277 | skb->protocol = htons(ETH_P_IP); |
1278 | skb_pull(skb, 13); |
1279 | skb->dev = dev; |
1280 | skb->h.raw = skb->data; |
1281 | |
1282 | stats = dev->priv; |
1283 | stats->rx_packets++; |
1284 | stats->rx_bytes += skb->len + 13; |
1285 | netif_rx(skb); /* Send the SKB up to a higher place. */ |
1286 | return 0; |
1287 | } |
1288 | #else |
1289 | /* make it easy for gcc to optimize this test out, i.e. kill the code */ |
1290 | #define is_ip_over_ddp(skb) 0 |
1291 | #define handle_ip_over_ddp(skb) 0 |
1292 | #endif |
1293 | |
1294 | static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev, |
1295 | struct ddpehdr *ddp, struct ddpebits *ddphv, |
1296 | int origlen) |
1297 | { |
1298 | struct atalk_route *rt; |
1299 | struct atalk_addr ta; |
1300 | |
1301 | /* |
1302 | * Don't route multicast, etc., packets, or packets sent to "this |
1303 | * network" |
1304 | */ |
1305 | if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { |
1306 | /* |
1307 | * FIXME: |
1308 | * |
1309 | * Can it ever happen that a packet is from a PPP iface and |
1310 | * needs to be broadcast onto the default network? |
1311 | */ |
1312 | if (dev->type == ARPHRD_PPP) |
1313 | printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " |
1314 | "packet received from PPP iface\n"); |
1315 | goto free_it; |
1316 | } |
1317 | |
1318 | ta.s_net = ddp->deh_dnet; |
1319 | ta.s_node = ddp->deh_dnode; |
1320 | |
1321 | /* Route the packet */ |
1322 | rt = atrtr_find(&ta); |
1323 | if (!rt || ddphv->deh_hops == DDP_MAXHOPS) |
1324 | goto free_it; |
1325 | /* FIXME: use skb->cb to be able to use shared skbs */ |
1326 | ddphv->deh_hops++; |
1327 | |
1328 | /* |
1329 | * Route goes through another gateway, so set the target to the |
1330 | * gateway instead. |
1331 | */ |
1332 | |
1333 | if (rt->flags & RTF_GATEWAY) { |
1334 | ta.s_net = rt->gateway.s_net; |
1335 | ta.s_node = rt->gateway.s_node; |
1336 | } |
1337 | |
1338 | /* Fix up skb->len field */ |
1339 | skb_trim(skb, min_t(unsigned int, origlen, |
1340 | (rt->dev->hard_header_len + |
1341 | ddp_dl->header_length + ddphv->deh_len))); |
1342 | |
1343 | /* Mend the byte order */ |
1344 | /* FIXME: use skb->cb to be able to use shared skbs */ |
1345 | *((__u16 *)ddp) = ntohs(*((__u16 *)ddphv)); |
1346 | |
1347 | /* |
1348 | * Send the buffer onwards |
1349 | * |
1350 | * Now we must always be careful. If it's come from LocalTalk to |
1351 | * EtherTalk it might not fit |
1352 | * |
1353 | * Order matters here: If a packet has to be copied to make a new |
1354 | * headroom (rare hopefully) then it won't need unsharing. |
1355 | * |
1356 | * Note. ddp-> becomes invalid at the realloc. |
1357 | */ |
1358 | if (skb_headroom(skb) < 22) { |
1359 | /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ |
1360 | struct sk_buff *nskb = skb_realloc_headroom(skb, 32); |
1361 | kfree_skb(skb); |
1362 | if (!nskb) |
1363 | goto out; |
1364 | skb = nskb; |
1365 | } else |
1366 | skb = skb_unshare(skb, GFP_ATOMIC); |
1367 | |
1368 | /* |
1369 | * If the buffer didn't vanish into the lack of space bitbucket we can |
1370 | * send it. |
1371 | */ |
1372 | if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1) |
1373 | goto free_it; |
1374 | out: |
1375 | return; |
1376 | free_it: |
1377 | kfree_skb(skb); |
1378 | } |
1379 | |
1380 | /** |
1381 | * atalk_rcv - Receive a packet (in skb) from device dev |
1382 | * @skb - packet received |
1383 | * @dev - network device where the packet comes from |
1384 | * @pt - packet type |
1385 | * |
1386 | * Receive a packet (in skb) from device dev. This has come from the SNAP |
1387 | * decoder, and on entry skb->h.raw is the DDP header, skb->len is the DDP |
1388 | * header, skb->len is the DDP length. The physical headers have been |
1389 | * extracted. PPP should probably pass frames marked as for this layer. |
1390 | * [ie ARPHRD_ETHERTALK] |
1391 | */ |
1392 | static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, |
1393 | struct packet_type *pt) |
1394 | { |
1395 | struct ddpehdr *ddp; |
1396 | struct sock *sock; |
1397 | struct atalk_iface *atif; |
1398 | struct sockaddr_at tosat; |
1399 | int origlen; |
1400 | struct ddpebits ddphv; |
1401 | |
1402 | /* Don't mangle buffer if shared */ |
1403 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1404 | goto out; |
1405 | |
1406 | /* Size check and make sure header is contiguous */ |
1407 | if (!pskb_may_pull(skb, sizeof(*ddp))) |
1408 | goto freeit; |
1409 | |
1410 | ddp = ddp_hdr(skb); |
1411 | |
1412 | /* |
1413 | * Fix up the length field [Ok this is horrible but otherwise |
1414 | * I end up with unions of bit fields and messy bit field order |
1415 | * compiler/endian dependencies..] |
1416 | */ |
1417 | *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp)); |
1418 | |
1419 | /* Trim buffer in case of stray trailing data */ |
1420 | origlen = skb->len; |
1421 | skb_trim(skb, min_t(unsigned int, skb->len, ddphv.deh_len)); |
1422 | |
1423 | /* |
1424 | * Size check to see if ddp->deh_len was crap |
1425 | * (Otherwise we'll detonate most spectacularly |
1426 | * in the middle of recvmsg()). |
1427 | */ |
1428 | if (skb->len < sizeof(*ddp)) |
1429 | goto freeit; |
1430 | |
1431 | /* |
1432 | * Any checksums. Note we don't do htons() on this == is assumed to be |
1433 | * valid for net byte orders all over the networking code... |
1434 | */ |
1435 | if (ddp->deh_sum && |
1436 | atalk_checksum(skb, ddphv.deh_len) != ddp->deh_sum) |
1437 | /* Not a valid AppleTalk frame - dustbin time */ |
1438 | goto freeit; |
1439 | |
1440 | /* Check the packet is aimed at us */ |
1441 | if (!ddp->deh_dnet) /* Net 0 is 'this network' */ |
1442 | atif = atalk_find_anynet(ddp->deh_dnode, dev); |
1443 | else |
1444 | atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); |
1445 | |
1446 | /* Not ours, so we route the packet via the correct AppleTalk iface */ |
1447 | if (!atif) { |
1448 | atalk_route_packet(skb, dev, ddp, &ddphv, origlen); |
1449 | goto out; |
1450 | } |
1451 | |
1452 | /* if IP over DDP is not selected this code will be optimized out */ |
1453 | if (is_ip_over_ddp(skb)) |
1454 | return handle_ip_over_ddp(skb); |
1455 | /* |
1456 | * Which socket - atalk_search_socket() looks for a *full match* |
1457 | * of the <net, node, port> tuple. |
1458 | */ |
1459 | tosat.sat_addr.s_net = ddp->deh_dnet; |
1460 | tosat.sat_addr.s_node = ddp->deh_dnode; |
1461 | tosat.sat_port = ddp->deh_dport; |
1462 | |
1463 | sock = atalk_search_socket(&tosat, atif); |
1464 | if (!sock) /* But not one of our sockets */ |
1465 | goto freeit; |
1466 | |
1467 | /* Queue packet (standard) */ |
1468 | skb->sk = sock; |
1469 | |
1470 | if (sock_queue_rcv_skb(sock, skb) < 0) |
1471 | goto freeit; |
1472 | out: |
1473 | return 0; |
1474 | freeit: |
1475 | kfree_skb(skb); |
1476 | goto out; |
1477 | } |
1478 | |
1479 | /* |
1480 | * Receive a LocalTalk frame. We make some demands on the caller here. |
1481 | * Caller must provide enough headroom on the packet to pull the short |
1482 | * header and append a long one. |
1483 | */ |
1484 | static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, |
1485 | struct packet_type *pt) |
1486 | { |
1487 | /* Expand any short form frames */ |
1488 | if (skb->mac.raw[2] == 1) { |
1489 | struct ddpehdr *ddp; |
1490 | /* Find our address */ |
1491 | struct atalk_addr *ap = atalk_find_dev_addr(dev); |
1492 | |
1493 | if (!ap || skb->len < sizeof(struct ddpshdr)) |
1494 | goto freeit; |
1495 | |
1496 | /* Don't mangle buffer if shared */ |
1497 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1498 | return 0; |
1499 | |
1500 | /* |
1501 | * The push leaves us with a ddephdr not an shdr, and |
1502 | * handily the port bytes in the right place preset. |
1503 | */ |
1504 | ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4); |
1505 | |
1506 | /* Now fill in the long header */ |
1507 | |
1508 | /* |
1509 | * These two first. The mac overlays the new source/dest |
1510 | * network information so we MUST copy these before |
1511 | * we write the network numbers ! |
1512 | */ |
1513 | |
1514 | ddp->deh_dnode = skb->mac.raw[0]; /* From physical header */ |
1515 | ddp->deh_snode = skb->mac.raw[1]; /* From physical header */ |
1516 | |
1517 | ddp->deh_dnet = ap->s_net; /* Network number */ |
1518 | ddp->deh_snet = ap->s_net; |
1519 | ddp->deh_sum = 0; /* No checksum */ |
1520 | /* |
1521 | * Not sure about this bit... |
1522 | */ |
1523 | ddp->deh_len = skb->len; |
1524 | ddp->deh_hops = DDP_MAXHOPS; /* Non routable, so force a drop |
1525 | if we slip up later */ |
1526 | /* Mend the byte order */ |
1527 | *((__u16 *)ddp) = htons(*((__u16 *)ddp)); |
1528 | } |
1529 | skb->h.raw = skb->data; |
1530 | |
1531 | return atalk_rcv(skb, dev, pt); |
1532 | freeit: |
1533 | kfree_skb(skb); |
1534 | return 0; |
1535 | } |
1536 | |
1537 | static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, |
1538 | size_t len) |
1539 | { |
1540 | struct sock *sk = sock->sk; |
1541 | struct atalk_sock *at = at_sk(sk); |
1542 | struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name; |
1543 | int flags = msg->msg_flags; |
1544 | int loopback = 0; |
1545 | struct sockaddr_at local_satalk, gsat; |
1546 | struct sk_buff *skb; |
1547 | struct net_device *dev; |
1548 | struct ddpehdr *ddp; |
1549 | int size; |
1550 | struct atalk_route *rt; |
1551 | int err; |
1552 | |
1553 | if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) |
1554 | return -EINVAL; |
1555 | |
1556 | if (len > DDP_MAXSZ) |
1557 | return -EMSGSIZE; |
1558 | |
1559 | if (usat) { |
1560 | if (sock_flag(sk, SOCK_ZAPPED)) |
1561 | if (atalk_autobind(sk) < 0) |
1562 | return -EBUSY; |
1563 | |
1564 | if (msg->msg_namelen < sizeof(*usat) || |
1565 | usat->sat_family != AF_APPLETALK) |
1566 | return -EINVAL; |
1567 | |
1568 | /* netatalk doesn't implement this check */ |
1569 | if (usat->sat_addr.s_node == ATADDR_BCAST && |
1570 | !sock_flag(sk, SOCK_BROADCAST)) { |
1571 | printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as " |
1572 | "it will break before 2.2\n"); |
1573 | #if 0 |
1574 | return -EPERM; |
1575 | #endif |
1576 | } |
1577 | } else { |
1578 | if (sk->sk_state != TCP_ESTABLISHED) |
1579 | return -ENOTCONN; |
1580 | usat = &local_satalk; |
1581 | usat->sat_family = AF_APPLETALK; |
1582 | usat->sat_port = at->dest_port; |
1583 | usat->sat_addr.s_node = at->dest_node; |
1584 | usat->sat_addr.s_net = at->dest_net; |
1585 | } |
1586 | |
1587 | /* Build a packet */ |
1588 | SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); |
1589 | |
1590 | /* For headers */ |
1591 | size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; |
1592 | |
1593 | if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { |
1594 | rt = atrtr_find(&usat->sat_addr); |
1595 | if (!rt) |
1596 | return -ENETUNREACH; |
1597 | |
1598 | dev = rt->dev; |
1599 | } else { |
1600 | struct atalk_addr at_hint; |
1601 | |
1602 | at_hint.s_node = 0; |
1603 | at_hint.s_net = at->src_net; |
1604 | |
1605 | rt = atrtr_find(&at_hint); |
1606 | if (!rt) |
1607 | return -ENETUNREACH; |
1608 | |
1609 | dev = rt->dev; |
1610 | } |
1611 | |
1612 | SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", |
1613 | sk, size, dev->name); |
1614 | |
1615 | size += dev->hard_header_len; |
1616 | skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); |
1617 | if (!skb) |
1618 | return err; |
1619 | |
1620 | skb->sk = sk; |
1621 | skb_reserve(skb, ddp_dl->header_length); |
1622 | skb_reserve(skb, dev->hard_header_len); |
1623 | skb->dev = dev; |
1624 | |
1625 | SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); |
1626 | |
1627 | ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr)); |
1628 | ddp->deh_pad = 0; |
1629 | ddp->deh_hops = 0; |
1630 | ddp->deh_len = len + sizeof(*ddp); |
1631 | /* |
1632 | * Fix up the length field [Ok this is horrible but otherwise |
1633 | * I end up with unions of bit fields and messy bit field order |
1634 | * compiler/endian dependencies.. |
1635 | */ |
1636 | *((__u16 *)ddp) = ntohs(*((__u16 *)ddp)); |
1637 | |
1638 | ddp->deh_dnet = usat->sat_addr.s_net; |
1639 | ddp->deh_snet = at->src_net; |
1640 | ddp->deh_dnode = usat->sat_addr.s_node; |
1641 | ddp->deh_snode = at->src_node; |
1642 | ddp->deh_dport = usat->sat_port; |
1643 | ddp->deh_sport = at->src_port; |
1644 | |
1645 | SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len); |
1646 | |
1647 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1648 | if (err) { |
1649 | kfree_skb(skb); |
1650 | return -EFAULT; |
1651 | } |
1652 | |
1653 | if (sk->sk_no_check == 1) |
1654 | ddp->deh_sum = 0; |
1655 | else |
1656 | ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); |
1657 | |
1658 | /* |
1659 | * Loopback broadcast packets to non gateway targets (ie routes |
1660 | * to group we are in) |
1661 | */ |
1662 | if (ddp->deh_dnode == ATADDR_BCAST && |
1663 | !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { |
1664 | struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); |
1665 | |
1666 | if (skb2) { |
1667 | loopback = 1; |
1668 | SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); |
1669 | if (aarp_send_ddp(dev, skb2, |
1670 | &usat->sat_addr, NULL) == -1) |
1671 | kfree_skb(skb2); |
1672 | /* else queued/sent above in the aarp queue */ |
1673 | } |
1674 | } |
1675 | |
1676 | if (dev->flags & IFF_LOOPBACK || loopback) { |
1677 | SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); |
1678 | /* loop back */ |
1679 | skb_orphan(skb); |
1680 | ddp_dl->request(ddp_dl, skb, dev->dev_addr); |
1681 | } else { |
1682 | SOCK_DEBUG(sk, "SK %p: send out.\n", sk); |
1683 | if (rt->flags & RTF_GATEWAY) { |
1684 | gsat.sat_addr = rt->gateway; |
1685 | usat = &gsat; |
1686 | } |
1687 | |
1688 | if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1) |
1689 | kfree_skb(skb); |
1690 | /* else queued/sent above in the aarp queue */ |
1691 | } |
1692 | SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len); |
1693 | |
1694 | return len; |
1695 | } |
1696 | |
1697 | static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, |
1698 | size_t size, int flags) |
1699 | { |
1700 | struct sock *sk = sock->sk; |
1701 | struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name; |
1702 | struct ddpehdr *ddp; |
1703 | int copied = 0; |
1704 | int err = 0; |
1705 | struct ddpebits ddphv; |
1706 | struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
1707 | flags & MSG_DONTWAIT, &err); |
1708 | if (!skb) |
1709 | return err; |
1710 | |
1711 | /* FIXME: use skb->cb to be able to use shared skbs */ |
1712 | ddp = ddp_hdr(skb); |
1713 | *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp)); |
1714 | |
1715 | if (sk->sk_type == SOCK_RAW) { |
1716 | copied = ddphv.deh_len; |
1717 | if (copied > size) { |
1718 | copied = size; |
1719 | msg->msg_flags |= MSG_TRUNC; |
1720 | } |
1721 | |
1722 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
1723 | } else { |
1724 | copied = ddphv.deh_len - sizeof(*ddp); |
1725 | if (copied > size) { |
1726 | copied = size; |
1727 | msg->msg_flags |= MSG_TRUNC; |
1728 | } |
1729 | err = skb_copy_datagram_iovec(skb, sizeof(*ddp), |
1730 | msg->msg_iov, copied); |
1731 | } |
1732 | |
1733 | if (!err) { |
1734 | if (sat) { |
1735 | sat->sat_family = AF_APPLETALK; |
1736 | sat->sat_port = ddp->deh_sport; |
1737 | sat->sat_addr.s_node = ddp->deh_snode; |
1738 | sat->sat_addr.s_net = ddp->deh_snet; |
1739 | } |
1740 | msg->msg_namelen = sizeof(*sat); |
1741 | } |
1742 | |
1743 | skb_free_datagram(sk, skb); /* Free the datagram. */ |
1744 | return err ? : copied; |
1745 | } |
1746 | |
1747 | |
1748 | /* |
1749 | * AppleTalk ioctl calls. |
1750 | */ |
1751 | static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
1752 | { |
1753 | int rc = -EINVAL; |
1754 | struct sock *sk = sock->sk; |
1755 | void __user *argp = (void __user *)arg; |
1756 | |
1757 | switch (cmd) { |
1758 | /* Protocol layer */ |
1759 | case TIOCOUTQ: { |
1760 | long amount = sk->sk_sndbuf - |
1761 | atomic_read(&sk->sk_wmem_alloc); |
1762 | |
1763 | if (amount < 0) |
1764 | amount = 0; |
1765 | rc = put_user(amount, (int __user *)argp); |
1766 | break; |
1767 | } |
1768 | case TIOCINQ: { |
1769 | /* |
1770 | * These two are safe on a single CPU system as only |
1771 | * user tasks fiddle here |
1772 | */ |
1773 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
1774 | long amount = 0; |
1775 | |
1776 | if (skb) |
1777 | amount = skb->len - sizeof(struct ddpehdr); |
1778 | rc = put_user(amount, (int __user *)argp); |
1779 | break; |
1780 | } |
1781 | case SIOCGSTAMP: |
1782 | rc = sock_get_timestamp(sk, argp); |
1783 | break; |
1784 | /* Routing */ |
1785 | case SIOCADDRT: |
1786 | case SIOCDELRT: |
1787 | rc = -EPERM; |
1788 | if (capable(CAP_NET_ADMIN)) |
1789 | rc = atrtr_ioctl(cmd, argp); |
1790 | break; |
1791 | /* Interface */ |
1792 | case SIOCGIFADDR: |
1793 | case SIOCSIFADDR: |
1794 | case SIOCGIFBRDADDR: |
1795 | case SIOCATALKDIFADDR: |
1796 | case SIOCDIFADDR: |
1797 | case SIOCSARP: /* proxy AARP */ |
1798 | case SIOCDARP: /* proxy AARP */ |
1799 | rtnl_lock(); |
1800 | rc = atif_ioctl(cmd, argp); |
1801 | rtnl_unlock(); |
1802 | break; |
1803 | /* Physical layer ioctl calls */ |
1804 | case SIOCSIFLINK: |
1805 | case SIOCGIFHWADDR: |
1806 | case SIOCSIFHWADDR: |
1807 | case SIOCGIFFLAGS: |
1808 | case SIOCSIFFLAGS: |
1809 | case SIOCGIFTXQLEN: |
1810 | case SIOCSIFTXQLEN: |
1811 | case SIOCGIFMTU: |
1812 | case SIOCGIFCONF: |
1813 | case SIOCADDMULTI: |
1814 | case SIOCDELMULTI: |
1815 | case SIOCGIFCOUNT: |
1816 | case SIOCGIFINDEX: |
1817 | case SIOCGIFNAME: |
1818 | rc = dev_ioctl(cmd, argp); |
1819 | break; |
1820 | } |
1821 | |
1822 | return rc; |
1823 | } |
1824 | |
1825 | static struct net_proto_family atalk_family_ops = { |
1826 | .family = PF_APPLETALK, |
1827 | .create = atalk_create, |
1828 | .owner = THIS_MODULE, |
1829 | }; |
1830 | |
1831 | static struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = { |
1832 | .family = PF_APPLETALK, |
1833 | .owner = THIS_MODULE, |
1834 | .release = atalk_release, |
1835 | .bind = atalk_bind, |
1836 | .connect = atalk_connect, |
1837 | .socketpair = sock_no_socketpair, |
1838 | .accept = sock_no_accept, |
1839 | .getname = atalk_getname, |
1840 | .poll = datagram_poll, |
1841 | .ioctl = atalk_ioctl, |
1842 | .listen = sock_no_listen, |
1843 | .shutdown = sock_no_shutdown, |
1844 | .setsockopt = sock_no_setsockopt, |
1845 | .getsockopt = sock_no_getsockopt, |
1846 | .sendmsg = atalk_sendmsg, |
1847 | .recvmsg = atalk_recvmsg, |
1848 | .mmap = sock_no_mmap, |
1849 | .sendpage = sock_no_sendpage, |
1850 | }; |
1851 | |
1852 | #include <linux/smp_lock.h> |
1853 | SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK); |
1854 | |
1855 | static struct notifier_block ddp_notifier = { |
1856 | .notifier_call = ddp_device_event, |
1857 | }; |
1858 | |
1859 | static struct packet_type ltalk_packet_type = { |
1860 | .type = __constant_htons(ETH_P_LOCALTALK), |
1861 | .func = ltalk_rcv, |
1862 | }; |
1863 | |
1864 | static struct packet_type ppptalk_packet_type = { |
1865 | .type = __constant_htons(ETH_P_PPPTALK), |
1866 | .func = atalk_rcv, |
1867 | }; |
1868 | |
1869 | static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; |
1870 | |
1871 | /* Export symbols for use by drivers when AppleTalk is a module */ |
1872 | EXPORT_SYMBOL(aarp_send_ddp); |
1873 | EXPORT_SYMBOL(atrtr_get_dev); |
1874 | EXPORT_SYMBOL(atalk_find_dev_addr); |
1875 | |
1876 | static char atalk_err_snap[] __initdata = |
1877 | KERN_CRIT "Unable to register DDP with SNAP.\n"; |
1878 | |
1879 | /* Called by proto.c on kernel start up */ |
1880 | static int __init atalk_init(void) |
1881 | { |
1882 | int rc = proto_register(&ddp_proto, 0); |
1883 | |
1884 | if (rc != 0) |
1885 | goto out; |
1886 | |
1887 | (void)sock_register(&atalk_family_ops); |
1888 | ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); |
1889 | if (!ddp_dl) |
1890 | printk(atalk_err_snap); |
1891 | |
1892 | dev_add_pack(<alk_packet_type); |
1893 | dev_add_pack(&ppptalk_packet_type); |
1894 | |
1895 | register_netdevice_notifier(&ddp_notifier); |
1896 | aarp_proto_init(); |
1897 | atalk_proc_init(); |
1898 | atalk_register_sysctl(); |
1899 | out: |
1900 | return rc; |
1901 | } |
1902 | module_init(atalk_init); |
1903 | |
1904 | /* |
1905 | * No explicit module reference count manipulation is needed in the |
1906 | * protocol. Socket layer sets module reference count for us |
1907 | * and interfaces reference counting is done |
1908 | * by the network device layer. |
1909 | * |
1910 | * Ergo, before the AppleTalk module can be removed, all AppleTalk |
1911 | * sockets be closed from user space. |
1912 | */ |
1913 | static void __exit atalk_exit(void) |
1914 | { |
1915 | #ifdef CONFIG_SYSCTL |
1916 | atalk_unregister_sysctl(); |
1917 | #endif /* CONFIG_SYSCTL */ |
1918 | atalk_proc_exit(); |
1919 | aarp_cleanup_module(); /* General aarp clean-up. */ |
1920 | unregister_netdevice_notifier(&ddp_notifier); |
1921 | dev_remove_pack(<alk_packet_type); |
1922 | dev_remove_pack(&ppptalk_packet_type); |
1923 | unregister_snap_client(ddp_dl); |
1924 | sock_unregister(PF_APPLETALK); |
1925 | proto_unregister(&ddp_proto); |
1926 | } |
1927 | module_exit(atalk_exit); |
1928 | |
1929 | MODULE_LICENSE("GPL"); |
1930 | MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>"); |
1931 | MODULE_DESCRIPTION("AppleTalk 0.20\n"); |
1932 | MODULE_ALIAS_NETPROTO(PF_APPLETALK); |