blob: c410b93fda2ecde367bf1815dda21ccbbff36823 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * DDP: An implementation of the AppleTalk DDP protocol for
3 * Ethernet 'ELAP'.
4 *
Alan Cox113aa832008-10-13 19:01:08 -07005 * Alan Cox <alan@lxorguk.ukuu.org.uk>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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)
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +090031 * Jay Schulist : Made work as module with
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 * AppleTalk drivers, cleaned it.
33 * Rob Newberry : Added proxy AARP and AARP
34 * procfs, moved probing to AARP
35 * module.
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +090036 * Adrian Sun/
37 * Michael Zuelsdorff : fix for net.0 packets. don't
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 * allow illegal ether/tokentalk
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +090039 * port assignment. we lose a
40 * valid localtalk port as a
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 * 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.
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +090051 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 */
53
Randy Dunlap4fc268d2006-01-11 12:17:47 -080054#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/if_arp.h>
Alexey Dobriyan405f5572009-07-11 22:08:37 +040057#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <linux/termios.h> /* For TIOCOUTQ/INQ */
Stephen Rothwell415ce612009-11-08 20:41:03 -080059#include <linux/compat.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090060#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <net/datalink.h>
62#include <net/psnap.h>
63#include <net/sock.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070064#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <net/route.h>
66#include <linux/atalk.h>
Al Viroa1f8e7f72006-10-19 16:08:53 -040067#include "../core/kmap_skb.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69struct datalink_proto *ddp_dl, *aarp_dl;
Eric Dumazet90ddc4f2005-12-22 12:49:22 -080070static const struct proto_ops atalk_dgram_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72/**************************************************************************\
73* *
74* Handlers for the socket list. *
75* *
76\**************************************************************************/
77
78HLIST_HEAD(atalk_sockets);
79DEFINE_RWLOCK(atalk_sockets_lock);
80
81static inline void __atalk_insert_socket(struct sock *sk)
82{
83 sk_add_node(sk, &atalk_sockets);
84}
85
86static inline void atalk_remove_socket(struct sock *sk)
87{
88 write_lock_bh(&atalk_sockets_lock);
89 sk_del_node_init(sk);
90 write_unlock_bh(&atalk_sockets_lock);
91}
92
93static struct sock *atalk_search_socket(struct sockaddr_at *to,
94 struct atalk_iface *atif)
95{
96 struct sock *s;
97 struct hlist_node *node;
98
99 read_lock_bh(&atalk_sockets_lock);
100 sk_for_each(s, node, &atalk_sockets) {
101 struct atalk_sock *at = at_sk(s);
102
103 if (to->sat_port != at->src_port)
104 continue;
105
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900106 if (to->sat_addr.s_net == ATADDR_ANYNET &&
Oliver Dawid64233bf2005-09-27 16:11:29 -0700107 to->sat_addr.s_node == ATADDR_BCAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 goto found;
109
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900110 if (to->sat_addr.s_net == at->src_net &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 (to->sat_addr.s_node == at->src_node ||
112 to->sat_addr.s_node == ATADDR_BCAST ||
113 to->sat_addr.s_node == ATADDR_ANYNODE))
114 goto found;
115
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900116 /* XXXX.0 -- we got a request for this router. make sure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 * that the node is appropriately set. */
118 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
119 to->sat_addr.s_net != ATADDR_ANYNET &&
120 atif->address.s_node == at->src_node) {
121 to->sat_addr.s_node = atif->address.s_node;
122 goto found;
123 }
124 }
125 s = NULL;
126found:
127 read_unlock_bh(&atalk_sockets_lock);
128 return s;
129}
130
131/**
132 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
133 * @sk - socket to insert in the list if it is not there already
134 * @sat - address to search for
135 *
136 * Try to find a socket matching ADDR in the socket list, if found then return
137 * it. If not, insert SK into the socket list.
138 *
139 * This entire operation must execute atomically.
140 */
141static struct sock *atalk_find_or_insert_socket(struct sock *sk,
142 struct sockaddr_at *sat)
143{
144 struct sock *s;
145 struct hlist_node *node;
146 struct atalk_sock *at;
147
148 write_lock_bh(&atalk_sockets_lock);
149 sk_for_each(s, node, &atalk_sockets) {
150 at = at_sk(s);
151
152 if (at->src_net == sat->sat_addr.s_net &&
153 at->src_node == sat->sat_addr.s_node &&
154 at->src_port == sat->sat_port)
155 goto found;
156 }
157 s = NULL;
158 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
159found:
160 write_unlock_bh(&atalk_sockets_lock);
161 return s;
162}
163
164static void atalk_destroy_timer(unsigned long data)
165{
166 struct sock *sk = (struct sock *)data;
167
Eric Dumazetc5640392009-06-16 10:12:03 +0000168 if (sk_has_allocations(sk)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
170 add_timer(&sk->sk_timer);
171 } else
172 sock_put(sk);
173}
174
175static inline void atalk_destroy_socket(struct sock *sk)
176{
177 atalk_remove_socket(sk);
178 skb_queue_purge(&sk->sk_receive_queue);
179
Eric Dumazetc5640392009-06-16 10:12:03 +0000180 if (sk_has_allocations(sk)) {
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800181 setup_timer(&sk->sk_timer, atalk_destroy_timer,
182 (unsigned long)sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 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 */
196struct atalk_route *atalk_routes;
197DEFINE_RWLOCK(atalk_routes_lock);
198
199struct atalk_iface *atalk_interfaces;
200DEFINE_RWLOCK(atalk_interfaces_lock);
201
202/* For probing devices or in a routerless network */
203struct 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 */
210static 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
228static struct atalk_iface *atif_add_device(struct net_device *dev,
229 struct atalk_addr *sa)
230{
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700231 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233 if (!iface)
234 goto out;
235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 dev_hold(dev);
237 iface->dev = dev;
238 dev->atalk_ptr = iface;
239 iface->address = *sa;
240 iface->status = 0;
241
242 write_lock_bh(&atalk_interfaces_lock);
243 iface->next = atalk_interfaces;
244 atalk_interfaces = iface;
245 write_unlock_bh(&atalk_interfaces_lock);
246out:
247 return iface;
248}
249
250/* Perform phase 2 AARP probing on our tentative address */
251static int atif_probe_device(struct atalk_iface *atif)
252{
253 int netrange = ntohs(atif->nets.nr_lastnet) -
254 ntohs(atif->nets.nr_firstnet) + 1;
255 int probe_net = ntohs(atif->address.s_net);
256 int probe_node = atif->address.s_node;
257 int netct, nodect;
258
259 /* Offset the network we start probing with */
260 if (probe_net == ATADDR_ANYNET) {
261 probe_net = ntohs(atif->nets.nr_firstnet);
262 if (netrange)
263 probe_net += jiffies % netrange;
264 }
265 if (probe_node == ATADDR_ANYNODE)
266 probe_node = jiffies & 0xFF;
267
268 /* Scan the networks */
269 atif->status |= ATIF_PROBE;
270 for (netct = 0; netct <= netrange; netct++) {
271 /* Sweep the available nodes from a given start */
272 atif->address.s_net = htons(probe_net);
273 for (nodect = 0; nodect < 256; nodect++) {
274 atif->address.s_node = (nodect + probe_node) & 0xFF;
275 if (atif->address.s_node > 0 &&
276 atif->address.s_node < 254) {
277 /* Probe a proposed address */
278 aarp_probe_network(atif);
279
280 if (!(atif->status & ATIF_PROBE_FAIL)) {
281 atif->status &= ~ATIF_PROBE;
282 return 0;
283 }
284 }
285 atif->status &= ~ATIF_PROBE_FAIL;
286 }
287 probe_net++;
288 if (probe_net > ntohs(atif->nets.nr_lastnet))
289 probe_net = ntohs(atif->nets.nr_firstnet);
290 }
291 atif->status &= ~ATIF_PROBE;
292
293 return -EADDRINUSE; /* Network is full... */
294}
295
296
297/* Perform AARP probing for a proxy address */
298static int atif_proxy_probe_device(struct atalk_iface *atif,
299 struct atalk_addr* proxy_addr)
300{
301 int netrange = ntohs(atif->nets.nr_lastnet) -
302 ntohs(atif->nets.nr_firstnet) + 1;
303 /* we probe the interface's network */
304 int probe_net = ntohs(atif->address.s_net);
305 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
306 int netct, nodect;
307
308 /* Offset the network we start probing with */
309 if (probe_net == ATADDR_ANYNET) {
310 probe_net = ntohs(atif->nets.nr_firstnet);
311 if (netrange)
312 probe_net += jiffies % netrange;
313 }
314
315 if (probe_node == ATADDR_ANYNODE)
316 probe_node = jiffies & 0xFF;
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 /* Scan the networks */
319 for (netct = 0; netct <= netrange; netct++) {
320 /* Sweep the available nodes from a given start */
321 proxy_addr->s_net = htons(probe_net);
322 for (nodect = 0; nodect < 256; nodect++) {
323 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
324 if (proxy_addr->s_node > 0 &&
325 proxy_addr->s_node < 254) {
326 /* Tell AARP to probe a proposed address */
327 int ret = aarp_proxy_probe_network(atif,
328 proxy_addr);
329
330 if (ret != -EADDRINUSE)
331 return ret;
332 }
333 }
334 probe_net++;
335 if (probe_net > ntohs(atif->nets.nr_lastnet))
336 probe_net = ntohs(atif->nets.nr_firstnet);
337 }
338
339 return -EADDRINUSE; /* Network is full... */
340}
341
342
343struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
344{
345 struct atalk_iface *iface = dev->atalk_ptr;
346 return iface ? &iface->address : NULL;
347}
348
349static struct atalk_addr *atalk_find_primary(void)
350{
351 struct atalk_iface *fiface = NULL;
352 struct atalk_addr *retval;
353 struct atalk_iface *iface;
354
355 /*
356 * Return a point-to-point interface only if
357 * there is no non-ptp interface available.
358 */
359 read_lock_bh(&atalk_interfaces_lock);
360 for (iface = atalk_interfaces; iface; iface = iface->next) {
361 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
362 fiface = iface;
363 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
364 retval = &iface->address;
365 goto out;
366 }
367 }
368
369 if (fiface)
370 retval = &fiface->address;
371 else if (atalk_interfaces)
372 retval = &atalk_interfaces->address;
373 else
374 retval = NULL;
375out:
376 read_unlock_bh(&atalk_interfaces_lock);
377 return retval;
378}
379
380/*
381 * Find a match for 'any network' - ie any of our interfaces with that
382 * node number will do just nicely.
383 */
384static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
385{
386 struct atalk_iface *iface = dev->atalk_ptr;
387
388 if (!iface || iface->status & ATIF_PROBE)
389 goto out_err;
390
391 if (node != ATADDR_BCAST &&
392 iface->address.s_node != node &&
393 node != ATADDR_ANYNODE)
394 goto out_err;
395out:
396 return iface;
397out_err:
398 iface = NULL;
399 goto out;
400}
401
402/* Find a match for a specific network:node pair */
Alexey Dobriyanf6e276ee2005-06-20 13:32:05 -0700403static struct atalk_iface *atalk_find_interface(__be16 net, int node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404{
405 struct atalk_iface *iface;
406
407 read_lock_bh(&atalk_interfaces_lock);
408 for (iface = atalk_interfaces; iface; iface = iface->next) {
409 if ((node == ATADDR_BCAST ||
410 node == ATADDR_ANYNODE ||
411 iface->address.s_node == node) &&
412 iface->address.s_net == net &&
413 !(iface->status & ATIF_PROBE))
414 break;
415
416 /* XXXX.0 -- net.0 returns the iface associated with net */
417 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
418 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
419 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900420 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 }
422 read_unlock_bh(&atalk_interfaces_lock);
423 return iface;
424}
425
426
427/*
428 * Find a route for an AppleTalk packet. This ought to get cached in
429 * the socket (later on...). We know about host routes and the fact
430 * that a route must be direct to broadcast.
431 */
432static struct atalk_route *atrtr_find(struct atalk_addr *target)
433{
434 /*
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900435 * we must search through all routes unless we find a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 * host route, because some host routes might overlap
437 * network routes
438 */
439 struct atalk_route *net_route = NULL;
440 struct atalk_route *r;
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 read_lock_bh(&atalk_routes_lock);
443 for (r = atalk_routes; r; r = r->next) {
444 if (!(r->flags & RTF_UP))
445 continue;
446
447 if (r->target.s_net == target->s_net) {
448 if (r->flags & RTF_HOST) {
449 /*
450 * if this host route is for the target,
451 * the we're done
452 */
453 if (r->target.s_node == target->s_node)
454 goto out;
455 } else
456 /*
457 * this route will work if there isn't a
458 * direct host route, so cache it
459 */
460 net_route = r;
461 }
462 }
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900463
464 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 * if we found a network route but not a direct host
466 * route, then return it
467 */
468 if (net_route)
469 r = net_route;
470 else if (atrtr_default.dev)
471 r = &atrtr_default;
472 else /* No route can be found */
473 r = NULL;
474out:
475 read_unlock_bh(&atalk_routes_lock);
476 return r;
477}
478
479
480/*
481 * Given an AppleTalk network, find the device to use. This can be
482 * a simple lookup.
483 */
484struct net_device *atrtr_get_dev(struct atalk_addr *sa)
485{
486 struct atalk_route *atr = atrtr_find(sa);
487 return atr ? atr->dev : NULL;
488}
489
490/* Set up a default router */
491static void atrtr_set_default(struct net_device *dev)
492{
493 atrtr_default.dev = dev;
494 atrtr_default.flags = RTF_UP;
495 atrtr_default.gateway.s_net = htons(0);
496 atrtr_default.gateway.s_node = 0;
497}
498
499/*
500 * Add a router. Basically make sure it looks valid and stuff the
501 * entry in the list. While it uses netranges we always set them to one
502 * entry to work like netatalk.
503 */
504static int atrtr_create(struct rtentry *r, struct net_device *devhint)
505{
506 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
507 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
508 struct atalk_route *rt;
509 struct atalk_iface *iface, *riface;
510 int retval = -EINVAL;
511
512 /*
513 * Fixme: Raise/Lower a routing change semaphore for these
514 * operations.
515 */
516
517 /* Validate the request */
518 if (ta->sat_family != AF_APPLETALK ||
519 (!devhint && ga->sat_family != AF_APPLETALK))
520 goto out;
521
522 /* Now walk the routing table and make our decisions */
523 write_lock_bh(&atalk_routes_lock);
524 for (rt = atalk_routes; rt; rt = rt->next) {
525 if (r->rt_flags != rt->flags)
526 continue;
527
528 if (ta->sat_addr.s_net == rt->target.s_net) {
529 if (!(rt->flags & RTF_HOST))
530 break;
531 if (ta->sat_addr.s_node == rt->target.s_node)
532 break;
533 }
534 }
535
536 if (!devhint) {
537 riface = NULL;
538
539 read_lock_bh(&atalk_interfaces_lock);
540 for (iface = atalk_interfaces; iface; iface = iface->next) {
541 if (!riface &&
542 ntohs(ga->sat_addr.s_net) >=
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900543 ntohs(iface->nets.nr_firstnet) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 ntohs(ga->sat_addr.s_net) <=
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900545 ntohs(iface->nets.nr_lastnet))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 riface = iface;
547
548 if (ga->sat_addr.s_net == iface->address.s_net &&
549 ga->sat_addr.s_node == iface->address.s_node)
550 riface = iface;
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900551 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 read_unlock_bh(&atalk_interfaces_lock);
553
554 retval = -ENETUNREACH;
555 if (!riface)
556 goto out_unlock;
557
558 devhint = riface->dev;
559 }
560
561 if (!rt) {
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700562 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
564 retval = -ENOBUFS;
565 if (!rt)
566 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
568 rt->next = atalk_routes;
569 atalk_routes = rt;
570 }
571
572 /* Fill in the routing entry */
573 rt->target = ta->sat_addr;
Herbert Xuc7f905f02005-04-19 22:44:17 -0700574 dev_hold(devhint);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 rt->dev = devhint;
576 rt->flags = r->rt_flags;
577 rt->gateway = ga->sat_addr;
578
579 retval = 0;
580out_unlock:
581 write_unlock_bh(&atalk_routes_lock);
582out:
583 return retval;
584}
585
586/* Delete a route. Find it and discard it */
587static int atrtr_delete(struct atalk_addr * addr)
588{
589 struct atalk_route **r = &atalk_routes;
590 int retval = 0;
591 struct atalk_route *tmp;
592
593 write_lock_bh(&atalk_routes_lock);
594 while ((tmp = *r) != NULL) {
595 if (tmp->target.s_net == addr->s_net &&
596 (!(tmp->flags&RTF_GATEWAY) ||
597 tmp->target.s_node == addr->s_node)) {
598 *r = tmp->next;
599 dev_put(tmp->dev);
600 kfree(tmp);
601 goto out;
602 }
603 r = &tmp->next;
604 }
605 retval = -ENOENT;
606out:
607 write_unlock_bh(&atalk_routes_lock);
608 return retval;
609}
610
611/*
612 * Called when a device is downed. Just throw away any routes
613 * via it.
614 */
615static void atrtr_device_down(struct net_device *dev)
616{
617 struct atalk_route **r = &atalk_routes;
618 struct atalk_route *tmp;
619
620 write_lock_bh(&atalk_routes_lock);
621 while ((tmp = *r) != NULL) {
622 if (tmp->dev == dev) {
623 *r = tmp->next;
624 dev_put(dev);
625 kfree(tmp);
626 } else
627 r = &tmp->next;
628 }
629 write_unlock_bh(&atalk_routes_lock);
630
631 if (atrtr_default.dev == dev)
632 atrtr_set_default(NULL);
633}
634
635/* Actually down the interface */
636static inline void atalk_dev_down(struct net_device *dev)
637{
638 atrtr_device_down(dev); /* Remove all routes for the device */
639 aarp_device_down(dev); /* Remove AARP entries for the device */
640 atif_drop_device(dev); /* Remove the device */
641}
642
643/*
644 * A device event has occurred. Watch for devices going down and
645 * delete our use of them (iface and route).
646 */
647static int ddp_device_event(struct notifier_block *this, unsigned long event,
648 void *ptr)
649{
Eric W. Biederman890d52d2007-09-12 11:26:59 +0200650 struct net_device *dev = ptr;
651
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700652 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200653 return NOTIFY_DONE;
654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 if (event == NETDEV_DOWN)
656 /* Discard any use of this */
Eric W. Biederman890d52d2007-09-12 11:26:59 +0200657 atalk_dev_down(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
659 return NOTIFY_DONE;
660}
661
662/* ioctl calls. Shouldn't even need touching */
663/* Device configuration ioctl calls */
664static int atif_ioctl(int cmd, void __user *arg)
665{
666 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
667 struct ifreq atreq;
668 struct atalk_netrange *nr;
669 struct sockaddr_at *sa;
670 struct net_device *dev;
671 struct atalk_iface *atif;
672 int ct;
673 int limit;
674 struct rtentry rtdef;
675 int add_route;
676
677 if (copy_from_user(&atreq, arg, sizeof(atreq)))
678 return -EFAULT;
679
Eric W. Biederman881d9662007-09-17 11:56:21 -0700680 dev = __dev_get_by_name(&init_net, atreq.ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 if (!dev)
682 return -ENODEV;
683
684 sa = (struct sockaddr_at *)&atreq.ifr_addr;
685 atif = atalk_find_dev(dev);
686
687 switch (cmd) {
688 case SIOCSIFADDR:
689 if (!capable(CAP_NET_ADMIN))
690 return -EPERM;
691 if (sa->sat_family != AF_APPLETALK)
692 return -EINVAL;
693 if (dev->type != ARPHRD_ETHER &&
694 dev->type != ARPHRD_LOOPBACK &&
695 dev->type != ARPHRD_LOCALTLK &&
696 dev->type != ARPHRD_PPP)
697 return -EPROTONOSUPPORT;
698
699 nr = (struct atalk_netrange *)&sa->sat_zero[0];
700 add_route = 1;
701
702 /*
703 * if this is a point-to-point iface, and we already
704 * have an iface for this AppleTalk address, then we
705 * should not add a route
706 */
707 if ((dev->flags & IFF_POINTOPOINT) &&
708 atalk_find_interface(sa->sat_addr.s_net,
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900709 sa->sat_addr.s_node)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 printk(KERN_DEBUG "AppleTalk: point-to-point "
711 "interface added with "
712 "existing address\n");
713 add_route = 0;
714 }
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 /*
717 * Phase 1 is fine on LocalTalk but we don't do
718 * EtherTalk phase 1. Anyone wanting to add it go ahead.
719 */
720 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
721 return -EPROTONOSUPPORT;
722 if (sa->sat_addr.s_node == ATADDR_BCAST ||
723 sa->sat_addr.s_node == 254)
724 return -EINVAL;
725 if (atif) {
726 /* Already setting address */
727 if (atif->status & ATIF_PROBE)
728 return -EBUSY;
729
730 atif->address.s_net = sa->sat_addr.s_net;
731 atif->address.s_node = sa->sat_addr.s_node;
732 atrtr_device_down(dev); /* Flush old routes */
733 } else {
734 atif = atif_add_device(dev, &sa->sat_addr);
735 if (!atif)
736 return -ENOMEM;
737 }
738 atif->nets = *nr;
739
740 /*
741 * Check if the chosen address is used. If so we
742 * error and atalkd will try another.
743 */
744
745 if (!(dev->flags & IFF_LOOPBACK) &&
746 !(dev->flags & IFF_POINTOPOINT) &&
747 atif_probe_device(atif) < 0) {
748 atif_drop_device(dev);
749 return -EADDRINUSE;
750 }
751
752 /* Hey it worked - add the direct routes */
753 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
754 sa->sat_family = AF_APPLETALK;
755 sa->sat_addr.s_net = atif->address.s_net;
756 sa->sat_addr.s_node = atif->address.s_node;
757 sa = (struct sockaddr_at *)&rtdef.rt_dst;
758 rtdef.rt_flags = RTF_UP;
759 sa->sat_family = AF_APPLETALK;
760 sa->sat_addr.s_node = ATADDR_ANYNODE;
761 if (dev->flags & IFF_LOOPBACK ||
762 dev->flags & IFF_POINTOPOINT)
763 rtdef.rt_flags |= RTF_HOST;
764
765 /* Routerless initial state */
766 if (nr->nr_firstnet == htons(0) &&
767 nr->nr_lastnet == htons(0xFFFE)) {
768 sa->sat_addr.s_net = atif->address.s_net;
769 atrtr_create(&rtdef, dev);
770 atrtr_set_default(dev);
771 } else {
772 limit = ntohs(nr->nr_lastnet);
773 if (limit - ntohs(nr->nr_firstnet) > 4096) {
774 printk(KERN_WARNING "Too many routes/"
775 "iface.\n");
776 return -EINVAL;
777 }
778 if (add_route)
779 for (ct = ntohs(nr->nr_firstnet);
780 ct <= limit; ct++) {
781 sa->sat_addr.s_net = htons(ct);
782 atrtr_create(&rtdef, dev);
783 }
784 }
Jiri Pirko22bedad32010-04-01 21:22:57 +0000785 dev_mc_add_global(dev, aarp_mcast);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 return 0;
787
788 case SIOCGIFADDR:
789 if (!atif)
790 return -EADDRNOTAVAIL;
791
792 sa->sat_family = AF_APPLETALK;
793 sa->sat_addr = atif->address;
794 break;
795
796 case SIOCGIFBRDADDR:
797 if (!atif)
798 return -EADDRNOTAVAIL;
799
800 sa->sat_family = AF_APPLETALK;
801 sa->sat_addr.s_net = atif->address.s_net;
802 sa->sat_addr.s_node = ATADDR_BCAST;
803 break;
804
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900805 case SIOCATALKDIFADDR:
806 case SIOCDIFADDR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 if (!capable(CAP_NET_ADMIN))
808 return -EPERM;
809 if (sa->sat_family != AF_APPLETALK)
810 return -EINVAL;
811 atalk_dev_down(dev);
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900812 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 case SIOCSARP:
815 if (!capable(CAP_NET_ADMIN))
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900816 return -EPERM;
817 if (sa->sat_family != AF_APPLETALK)
818 return -EINVAL;
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900819 /*
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900826 /*
827 * atif points to the current interface on this network;
828 * we aren't concerned about its current status (at
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 * least for now), but it has all the settings about
830 * the network we're going to probe. Consequently, it
831 * must exist.
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900832 */
833 if (!atif)
834 return -EADDRNOTAVAIL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900836 nr = (struct atalk_netrange *)&(atif->nets);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 /*
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900838 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 * 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.
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900860 */
861 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900863 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900871 /* give to aarp module to remove proxy entry */
872 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
873 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 }
875
876 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
877}
878
879/* Routing ioctl() calls */
880static 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';
Eric W. Biederman881d9662007-09-17 11:56:21 -0700901 dev = __dev_get_by_name(&init_net, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 if (!dev)
903 return -ENODEV;
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900904 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 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 */
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900922static unsigned long atalk_sum_partial(const unsigned char *data,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 int len, unsigned long sum)
924{
925 /* This ought to be unwrapped neatly. I'll trust gcc for now */
926 while (len--) {
Joe Perchesf7a3a1d2009-11-04 10:26:13 +0000927 sum += *data++;
928 sum = rol16(sum, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 }
930 return sum;
931}
932
933/* Checksum skb data -- similar to skb_checksum */
934static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
935 int len, unsigned long sum)
936{
David S. Miller1a028e52007-04-27 15:21:23 -0700937 int start = skb_headlen(skb);
David S. Millerc32ba3f2009-06-09 00:17:44 -0700938 struct sk_buff *frag_iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 int i, copy;
940
941 /* checksum stuff in header space */
David S. Miller1a028e52007-04-27 15:21:23 -0700942 if ( (copy = start - offset) > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 if (copy > len)
944 copy = len;
945 sum = atalk_sum_partial(skb->data + offset, copy, sum);
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +0900946 if ( (len -= copy) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 return sum;
948
949 offset += copy;
950 }
951
952 /* checksum stuff in frags */
953 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
David S. Miller1a028e52007-04-27 15:21:23 -0700954 int end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700956 WARN_ON(start > offset + len);
David S. Miller1a028e52007-04-27 15:21:23 -0700957
958 end = start + skb_shinfo(skb)->frags[i].size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 if ((copy = end - offset) > 0) {
960 u8 *vaddr;
961 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
962
963 if (copy > len)
964 copy = len;
965 vaddr = kmap_skb_frag(frag);
David S. Miller1a028e52007-04-27 15:21:23 -0700966 sum = atalk_sum_partial(vaddr + frag->page_offset +
967 offset - start, copy, sum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 kunmap_skb_frag(vaddr);
969
970 if (!(len -= copy))
971 return sum;
972 offset += copy;
973 }
David S. Miller1a028e52007-04-27 15:21:23 -0700974 start = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 }
976
David S. Millerc32ba3f2009-06-09 00:17:44 -0700977 skb_walk_frags(skb, frag_iter) {
978 int end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
David S. Millerc32ba3f2009-06-09 00:17:44 -0700980 WARN_ON(start > offset + len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
David S. Millerc32ba3f2009-06-09 00:17:44 -0700982 end = start + frag_iter->len;
983 if ((copy = end - offset) > 0) {
984 if (copy > len)
985 copy = len;
986 sum = atalk_sum_skb(frag_iter, offset - start,
987 copy, sum);
988 if ((len -= copy) == 0)
989 return sum;
990 offset += copy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 }
David S. Millerc32ba3f2009-06-09 00:17:44 -0700992 start = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 }
994
995 BUG_ON(len > 0);
996
997 return sum;
998}
999
Al Viro2a50f282006-09-26 21:22:08 -07001000static __be16 atalk_checksum(const struct sk_buff *skb, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001{
1002 unsigned long sum;
1003
1004 /* skip header 4 bytes */
1005 sum = atalk_sum_skb(skb, 4, len-4, 0);
1006
1007 /* Use 0xFFFF for 0. 0 itself means none */
Al Viro2a50f282006-09-26 21:22:08 -07001008 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009}
1010
1011static struct proto ddp_proto = {
1012 .name = "DDP",
1013 .owner = THIS_MODULE,
1014 .obj_size = sizeof(struct atalk_sock),
1015};
1016
1017/*
1018 * Create a socket. Initialise the socket, blank the addresses
1019 * set the state.
1020 */
Eric Paris3f378b62009-11-05 22:18:14 -08001021static int atalk_create(struct net *net, struct socket *sock, int protocol,
1022 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023{
1024 struct sock *sk;
1025 int rc = -ESOCKTNOSUPPORT;
1026
Octavian Purdila09ad9bc2009-11-25 15:14:13 -08001027 if (!net_eq(net, &init_net))
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001028 return -EAFNOSUPPORT;
1029
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 /*
1031 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001032 * and gives you the full ELAP frame. Should be handy for CAP 8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 */
1034 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1035 goto out;
1036 rc = -ENOMEM;
Pavel Emelyanov6257ff22007-11-01 00:39:31 -07001037 sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 if (!sk)
1039 goto out;
1040 rc = 0;
1041 sock->ops = &atalk_dgram_ops;
1042 sock_init_data(sock, sk);
1043
1044 /* Checksums on by default */
1045 sock_set_flag(sk, SOCK_ZAPPED);
1046out:
1047 return rc;
1048}
1049
1050/* Free a socket. No work needed */
1051static int atalk_release(struct socket *sock)
1052{
1053 struct sock *sk = sock->sk;
1054
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001055 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 if (sk) {
1057 sock_orphan(sk);
1058 sock->sk = NULL;
1059 atalk_destroy_socket(sk);
1060 }
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001061 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 return 0;
1063}
1064
1065/**
1066 * atalk_pick_and_bind_port - Pick a source port when one is not given
1067 * @sk - socket to insert into the tables
1068 * @sat - address to search for
1069 *
1070 * Pick a source port when one is not given. If we can find a suitable free
1071 * one, we insert the socket into the tables using it.
1072 *
1073 * This whole operation must be atomic.
1074 */
1075static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1076{
1077 int retval;
1078
1079 write_lock_bh(&atalk_sockets_lock);
1080
1081 for (sat->sat_port = ATPORT_RESERVED;
1082 sat->sat_port < ATPORT_LAST;
1083 sat->sat_port++) {
1084 struct sock *s;
1085 struct hlist_node *node;
1086
1087 sk_for_each(s, node, &atalk_sockets) {
1088 struct atalk_sock *at = at_sk(s);
1089
1090 if (at->src_net == sat->sat_addr.s_net &&
1091 at->src_node == sat->sat_addr.s_node &&
1092 at->src_port == sat->sat_port)
1093 goto try_next_port;
1094 }
1095
1096 /* Wheee, it's free, assign and insert. */
1097 __atalk_insert_socket(sk);
1098 at_sk(sk)->src_port = sat->sat_port;
1099 retval = 0;
1100 goto out;
1101
1102try_next_port:;
1103 }
1104
1105 retval = -EBUSY;
1106out:
1107 write_unlock_bh(&atalk_sockets_lock);
1108 return retval;
1109}
1110
1111static int atalk_autobind(struct sock *sk)
1112{
1113 struct atalk_sock *at = at_sk(sk);
1114 struct sockaddr_at sat;
1115 struct atalk_addr *ap = atalk_find_primary();
1116 int n = -EADDRNOTAVAIL;
1117
1118 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1119 goto out;
1120
1121 at->src_net = sat.sat_addr.s_net = ap->s_net;
1122 at->src_node = sat.sat_addr.s_node = ap->s_node;
1123
1124 n = atalk_pick_and_bind_port(sk, &sat);
1125 if (!n)
1126 sock_reset_flag(sk, SOCK_ZAPPED);
1127out:
1128 return n;
1129}
1130
1131/* Set the address 'our end' of the connection */
1132static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1133{
1134 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1135 struct sock *sk = sock->sk;
1136 struct atalk_sock *at = at_sk(sk);
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001137 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138
1139 if (!sock_flag(sk, SOCK_ZAPPED) ||
1140 addr_len != sizeof(struct sockaddr_at))
1141 return -EINVAL;
1142
1143 if (addr->sat_family != AF_APPLETALK)
1144 return -EAFNOSUPPORT;
1145
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001146 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1148 struct atalk_addr *ap = atalk_find_primary();
1149
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001150 err = -EADDRNOTAVAIL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 if (!ap)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001152 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
1154 at->src_net = addr->sat_addr.s_net = ap->s_net;
1155 at->src_node = addr->sat_addr.s_node= ap->s_node;
1156 } else {
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001157 err = -EADDRNOTAVAIL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 if (!atalk_find_interface(addr->sat_addr.s_net,
1159 addr->sat_addr.s_node))
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001160 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
1162 at->src_net = addr->sat_addr.s_net;
1163 at->src_node = addr->sat_addr.s_node;
1164 }
1165
1166 if (addr->sat_port == ATADDR_ANYPORT) {
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001167 err = atalk_pick_and_bind_port(sk, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001169 if (err < 0)
1170 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 } else {
1172 at->src_port = addr->sat_port;
1173
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001174 err = -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 if (atalk_find_or_insert_socket(sk, addr))
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001176 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 }
1178
1179 sock_reset_flag(sk, SOCK_ZAPPED);
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001180 err = 0;
1181out:
1182 unlock_kernel();
1183 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184}
1185
1186/* Set the address we talk to */
1187static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1188 int addr_len, int flags)
1189{
1190 struct sock *sk = sock->sk;
1191 struct atalk_sock *at = at_sk(sk);
1192 struct sockaddr_at *addr;
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001193 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
1195 sk->sk_state = TCP_CLOSE;
1196 sock->state = SS_UNCONNECTED;
1197
1198 if (addr_len != sizeof(*addr))
1199 return -EINVAL;
1200
1201 addr = (struct sockaddr_at *)uaddr;
1202
1203 if (addr->sat_family != AF_APPLETALK)
1204 return -EAFNOSUPPORT;
1205
1206 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1207 !sock_flag(sk, SOCK_BROADCAST)) {
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001208#if 1
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 printk(KERN_WARNING "%s is broken and did not set "
1210 "SO_BROADCAST. It will break when 2.2 is "
1211 "released.\n",
1212 current->comm);
1213#else
1214 return -EACCES;
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001215#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 }
1217
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001218 lock_kernel();
1219 err = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 if (sock_flag(sk, SOCK_ZAPPED))
1221 if (atalk_autobind(sk) < 0)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001222 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001224 err = -ENETUNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 if (!atrtr_get_dev(&addr->sat_addr))
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001226 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
1228 at->dest_port = addr->sat_port;
1229 at->dest_net = addr->sat_addr.s_net;
1230 at->dest_node = addr->sat_addr.s_node;
1231
1232 sock->state = SS_CONNECTED;
1233 sk->sk_state = TCP_ESTABLISHED;
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001234 err = 0;
1235out:
1236 unlock_kernel();
1237 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238}
1239
1240/*
1241 * Find the name of an AppleTalk socket. Just copy the right
1242 * fields into the sockaddr.
1243 */
1244static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1245 int *uaddr_len, int peer)
1246{
1247 struct sockaddr_at sat;
1248 struct sock *sk = sock->sk;
1249 struct atalk_sock *at = at_sk(sk);
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001250 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001252 lock_kernel();
1253 err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 if (sock_flag(sk, SOCK_ZAPPED))
1255 if (atalk_autobind(sk) < 0)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001256 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
1258 *uaddr_len = sizeof(struct sockaddr_at);
Eric Dumazet3d392472009-08-06 02:27:43 +00001259 memset(&sat.sat_zero, 0, sizeof(sat.sat_zero));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260
1261 if (peer) {
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001262 err = -ENOTCONN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 if (sk->sk_state != TCP_ESTABLISHED)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001264 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265
1266 sat.sat_addr.s_net = at->dest_net;
1267 sat.sat_addr.s_node = at->dest_node;
1268 sat.sat_port = at->dest_port;
1269 } else {
1270 sat.sat_addr.s_net = at->src_net;
1271 sat.sat_addr.s_node = at->src_node;
1272 sat.sat_port = at->src_port;
1273 }
1274
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001275 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 sat.sat_family = AF_APPLETALK;
1277 memcpy(uaddr, &sat, sizeof(sat));
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001278
1279out:
1280 unlock_kernel();
1281 return err;
1282}
1283
1284static unsigned int atalk_poll(struct file *file, struct socket *sock,
1285 poll_table *wait)
1286{
1287 int err;
1288 lock_kernel();
1289 err = datagram_poll(file, sock, wait);
1290 unlock_kernel();
1291 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292}
1293
1294#if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1295static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1296{
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001297 return skb->data[12] == 22;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298}
1299
1300static int handle_ip_over_ddp(struct sk_buff *skb)
1301{
Eric W. Biederman881d9662007-09-17 11:56:21 -07001302 struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 struct net_device_stats *stats;
1304
1305 /* This needs to be able to handle ipddp"N" devices */
Arnaldo Carvalho de Meloffcfb8d2009-09-11 11:35:22 -07001306 if (!dev) {
1307 kfree_skb(skb);
1308 return NET_RX_DROP;
1309 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001311 skb->protocol = htons(ETH_P_IP);
1312 skb_pull(skb, 13);
1313 skb->dev = dev;
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001314 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315
Wang Chen524ad0a2008-11-12 23:39:10 -08001316 stats = netdev_priv(dev);
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001317 stats->rx_packets++;
1318 stats->rx_bytes += skb->len + 13;
Arnaldo Carvalho de Meloffcfb8d2009-09-11 11:35:22 -07001319 return netif_rx(skb); /* Send the SKB up to a higher place. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320}
1321#else
1322/* make it easy for gcc to optimize this test out, i.e. kill the code */
1323#define is_ip_over_ddp(skb) 0
1324#define handle_ip_over_ddp(skb) 0
1325#endif
1326
Arnaldo Carvalho de Meloffcfb8d2009-09-11 11:35:22 -07001327static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1328 struct ddpehdr *ddp, __u16 len_hops, int origlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329{
1330 struct atalk_route *rt;
1331 struct atalk_addr ta;
1332
1333 /*
1334 * Don't route multicast, etc., packets, or packets sent to "this
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001335 * network"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 */
1337 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1338 /*
1339 * FIXME:
1340 *
1341 * Can it ever happen that a packet is from a PPP iface and
1342 * needs to be broadcast onto the default network?
1343 */
1344 if (dev->type == ARPHRD_PPP)
1345 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1346 "packet received from PPP iface\n");
1347 goto free_it;
1348 }
1349
1350 ta.s_net = ddp->deh_dnet;
1351 ta.s_node = ddp->deh_dnode;
1352
1353 /* Route the packet */
1354 rt = atrtr_find(&ta);
Al Viro2a50f282006-09-26 21:22:08 -07001355 /* increment hops count */
1356 len_hops += 1 << 10;
1357 if (!rt || !(len_hops & (15 << 10)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 goto free_it;
Al Viro2a50f282006-09-26 21:22:08 -07001359
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 /* FIXME: use skb->cb to be able to use shared skbs */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361
1362 /*
1363 * Route goes through another gateway, so set the target to the
1364 * gateway instead.
1365 */
1366
1367 if (rt->flags & RTF_GATEWAY) {
1368 ta.s_net = rt->gateway.s_net;
1369 ta.s_node = rt->gateway.s_node;
1370 }
1371
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001372 /* Fix up skb->len field */
1373 skb_trim(skb, min_t(unsigned int, origlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 (rt->dev->hard_header_len +
Al Viro2a50f282006-09-26 21:22:08 -07001375 ddp_dl->header_length + (len_hops & 1023))));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 /* FIXME: use skb->cb to be able to use shared skbs */
Al Viro2a50f282006-09-26 21:22:08 -07001378 ddp->deh_len_hops = htons(len_hops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380 /*
1381 * Send the buffer onwards
1382 *
1383 * Now we must always be careful. If it's come from LocalTalk to
1384 * EtherTalk it might not fit
1385 *
1386 * Order matters here: If a packet has to be copied to make a new
1387 * headroom (rare hopefully) then it won't need unsharing.
1388 *
1389 * Note. ddp-> becomes invalid at the realloc.
1390 */
1391 if (skb_headroom(skb) < 22) {
1392 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1393 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1394 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 skb = nskb;
1396 } else
1397 skb = skb_unshare(skb, GFP_ATOMIC);
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001398
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 /*
1400 * If the buffer didn't vanish into the lack of space bitbucket we can
1401 * send it.
1402 */
Arnaldo Carvalho de Meloffcfb8d2009-09-11 11:35:22 -07001403 if (skb == NULL)
1404 goto drop;
1405
1406 if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
1407 return NET_RX_DROP;
Mark Smith8be80572009-09-12 20:48:43 +00001408 return NET_RX_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409free_it:
1410 kfree_skb(skb);
Arnaldo Carvalho de Meloffcfb8d2009-09-11 11:35:22 -07001411drop:
1412 return NET_RX_DROP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413}
1414
1415/**
1416 * atalk_rcv - Receive a packet (in skb) from device dev
1417 * @skb - packet received
1418 * @dev - network device where the packet comes from
1419 * @pt - packet type
1420 *
1421 * Receive a packet (in skb) from device dev. This has come from the SNAP
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07001422 * decoder, and on entry skb->transport_header is the DDP header, skb->len
1423 * is the DDP header, skb->len is the DDP length. The physical headers
1424 * have been extracted. PPP should probably pass frames marked as for this
1425 * layer. [ie ARPHRD_ETHERTALK]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 */
1427static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001428 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429{
1430 struct ddpehdr *ddp;
1431 struct sock *sock;
1432 struct atalk_iface *atif;
1433 struct sockaddr_at tosat;
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001434 int origlen;
Al Viro2a50f282006-09-26 21:22:08 -07001435 __u16 len_hops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -07001437 if (!net_eq(dev_net(dev), &init_net))
Mark Smith6885ffb2009-08-06 23:21:22 +00001438 goto drop;
Eric W. Biedermane730c152007-09-17 11:53:39 -07001439
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 /* Don't mangle buffer if shared */
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001441 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 goto out;
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001443
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 /* Size check and make sure header is contiguous */
1445 if (!pskb_may_pull(skb, sizeof(*ddp)))
Mark Smith6885ffb2009-08-06 23:21:22 +00001446 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
1448 ddp = ddp_hdr(skb);
1449
Al Viro2a50f282006-09-26 21:22:08 -07001450 len_hops = ntohs(ddp->deh_len_hops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451
1452 /* Trim buffer in case of stray trailing data */
1453 origlen = skb->len;
Al Viro2a50f282006-09-26 21:22:08 -07001454 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
1456 /*
1457 * Size check to see if ddp->deh_len was crap
1458 * (Otherwise we'll detonate most spectacularly
Jean Delvare75559c12007-04-04 23:52:46 -07001459 * in the middle of atalk_checksum() or recvmsg()).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 */
Jean Delvare75559c12007-04-04 23:52:46 -07001461 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1462 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1463 "skb->len=%u)\n", len_hops & 1023, skb->len);
Mark Smith6885ffb2009-08-06 23:21:22 +00001464 goto drop;
Jean Delvare75559c12007-04-04 23:52:46 -07001465 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466
1467 /*
1468 * Any checksums. Note we don't do htons() on this == is assumed to be
1469 * valid for net byte orders all over the networking code...
1470 */
1471 if (ddp->deh_sum &&
Al Viro2a50f282006-09-26 21:22:08 -07001472 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 /* Not a valid AppleTalk frame - dustbin time */
Mark Smith6885ffb2009-08-06 23:21:22 +00001474 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475
1476 /* Check the packet is aimed at us */
1477 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1478 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1479 else
1480 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1481
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 if (!atif) {
Oliver Dawid64233bf2005-09-27 16:11:29 -07001483 /* Not ours, so we route the packet via the correct
1484 * AppleTalk iface
1485 */
Arnaldo Carvalho de Meloffcfb8d2009-09-11 11:35:22 -07001486 return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 }
1488
1489 /* if IP over DDP is not selected this code will be optimized out */
1490 if (is_ip_over_ddp(skb))
1491 return handle_ip_over_ddp(skb);
1492 /*
1493 * Which socket - atalk_search_socket() looks for a *full match*
1494 * of the <net, node, port> tuple.
1495 */
1496 tosat.sat_addr.s_net = ddp->deh_dnet;
1497 tosat.sat_addr.s_node = ddp->deh_dnode;
1498 tosat.sat_port = ddp->deh_dport;
1499
1500 sock = atalk_search_socket(&tosat, atif);
1501 if (!sock) /* But not one of our sockets */
Mark Smith6885ffb2009-08-06 23:21:22 +00001502 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503
1504 /* Queue packet (standard) */
1505 skb->sk = sock;
1506
1507 if (sock_queue_rcv_skb(sock, skb) < 0)
Mark Smith6885ffb2009-08-06 23:21:22 +00001508 goto drop;
1509
1510 return NET_RX_SUCCESS;
1511
1512drop:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 kfree_skb(skb);
Mark Smith6885ffb2009-08-06 23:21:22 +00001514out:
1515 return NET_RX_DROP;
1516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517}
1518
1519/*
1520 * Receive a LocalTalk frame. We make some demands on the caller here.
1521 * Caller must provide enough headroom on the packet to pull the short
1522 * header and append a long one.
1523 */
1524static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001525 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526{
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -07001527 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane730c152007-09-17 11:53:39 -07001528 goto freeit;
1529
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 /* Expand any short form frames */
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07001531 if (skb_mac_header(skb)[2] == 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 struct ddpehdr *ddp;
1533 /* Find our address */
1534 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1535
Al Viro2a50f282006-09-26 21:22:08 -07001536 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 goto freeit;
1538
1539 /* Don't mangle buffer if shared */
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001540 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 return 0;
1542
1543 /*
1544 * The push leaves us with a ddephdr not an shdr, and
1545 * handily the port bytes in the right place preset.
1546 */
1547 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1548
1549 /* Now fill in the long header */
1550
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001551 /*
1552 * These two first. The mac overlays the new source/dest
1553 * network information so we MUST copy these before
1554 * we write the network numbers !
1555 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07001557 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1558 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559
1560 ddp->deh_dnet = ap->s_net; /* Network number */
1561 ddp->deh_snet = ap->s_net;
1562 ddp->deh_sum = 0; /* No checksum */
1563 /*
1564 * Not sure about this bit...
1565 */
Al Viro2a50f282006-09-26 21:22:08 -07001566 /* Non routable, so force a drop if we slip up later */
1567 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 }
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001569 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001571 return atalk_rcv(skb, dev, pt, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572freeit:
1573 kfree_skb(skb);
1574 return 0;
1575}
1576
1577static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1578 size_t len)
1579{
1580 struct sock *sk = sock->sk;
1581 struct atalk_sock *at = at_sk(sk);
1582 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1583 int flags = msg->msg_flags;
1584 int loopback = 0;
1585 struct sockaddr_at local_satalk, gsat;
1586 struct sk_buff *skb;
1587 struct net_device *dev;
1588 struct ddpehdr *ddp;
1589 int size;
1590 struct atalk_route *rt;
1591 int err;
1592
1593 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1594 return -EINVAL;
1595
1596 if (len > DDP_MAXSZ)
1597 return -EMSGSIZE;
1598
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001599 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 if (usat) {
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001601 err = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 if (sock_flag(sk, SOCK_ZAPPED))
1603 if (atalk_autobind(sk) < 0)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001604 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001606 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 if (msg->msg_namelen < sizeof(*usat) ||
1608 usat->sat_family != AF_APPLETALK)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001609 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001611 err = -EPERM;
Alan Cox03ba9992009-03-27 00:27:18 -07001612 /* netatalk didn't implement this check */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1614 !sock_flag(sk, SOCK_BROADCAST)) {
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001615 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 }
1617 } else {
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001618 err = -ENOTCONN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 if (sk->sk_state != TCP_ESTABLISHED)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001620 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 usat = &local_satalk;
1622 usat->sat_family = AF_APPLETALK;
1623 usat->sat_port = at->dest_port;
1624 usat->sat_addr.s_node = at->dest_node;
1625 usat->sat_addr.s_net = at->dest_net;
1626 }
1627
1628 /* Build a packet */
1629 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1630
1631 /* For headers */
1632 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1633
1634 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1635 rt = atrtr_find(&usat->sat_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 } else {
1637 struct atalk_addr at_hint;
1638
1639 at_hint.s_node = 0;
1640 at_hint.s_net = at->src_net;
1641
1642 rt = atrtr_find(&at_hint);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 }
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001644 err = ENETUNREACH;
Oliver Dawid64233bf2005-09-27 16:11:29 -07001645 if (!rt)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001646 goto out;
Oliver Dawid64233bf2005-09-27 16:11:29 -07001647
1648 dev = rt->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
1650 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1651 sk, size, dev->name);
1652
1653 size += dev->hard_header_len;
1654 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1655 if (!skb)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001656 goto out;
YOSHIFUJI Hideakied4477b2007-02-09 23:24:27 +09001657
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 skb->sk = sk;
1659 skb_reserve(skb, ddp_dl->header_length);
1660 skb_reserve(skb, dev->hard_header_len);
1661 skb->dev = dev;
1662
1663 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1664
1665 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
Al Viro2a50f282006-09-26 21:22:08 -07001666 ddp->deh_len_hops = htons(len + sizeof(*ddp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 ddp->deh_dnet = usat->sat_addr.s_net;
1668 ddp->deh_snet = at->src_net;
1669 ddp->deh_dnode = usat->sat_addr.s_node;
1670 ddp->deh_snode = at->src_node;
1671 ddp->deh_dport = usat->sat_port;
1672 ddp->deh_sport = at->src_port;
1673
1674 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1675
1676 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1677 if (err) {
1678 kfree_skb(skb);
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001679 err = -EFAULT;
1680 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 }
1682
1683 if (sk->sk_no_check == 1)
1684 ddp->deh_sum = 0;
1685 else
1686 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1687
1688 /*
1689 * Loopback broadcast packets to non gateway targets (ie routes
1690 * to group we are in)
1691 */
1692 if (ddp->deh_dnode == ATADDR_BCAST &&
1693 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1694 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1695
1696 if (skb2) {
1697 loopback = 1;
1698 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
Arnaldo Carvalho de Meloffcfb8d2009-09-11 11:35:22 -07001699 /*
1700 * If it fails it is queued/sent above in the aarp queue
1701 */
1702 aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 }
1704 }
1705
1706 if (dev->flags & IFF_LOOPBACK || loopback) {
1707 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1708 /* loop back */
1709 skb_orphan(skb);
Oliver Dawid64233bf2005-09-27 16:11:29 -07001710 if (ddp->deh_dnode == ATADDR_BCAST) {
1711 struct atalk_addr at_lo;
1712
1713 at_lo.s_node = 0;
1714 at_lo.s_net = 0;
1715
1716 rt = atrtr_find(&at_lo);
1717 if (!rt) {
1718 kfree_skb(skb);
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001719 err = -ENETUNREACH;
1720 goto out;
Oliver Dawid64233bf2005-09-27 16:11:29 -07001721 }
1722 dev = rt->dev;
1723 skb->dev = dev;
1724 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1726 } else {
1727 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1728 if (rt->flags & RTF_GATEWAY) {
1729 gsat.sat_addr = rt->gateway;
1730 usat = &gsat;
1731 }
1732
Arnaldo Carvalho de Meloffcfb8d2009-09-11 11:35:22 -07001733 /*
1734 * If it fails it is queued/sent above in the aarp queue
1735 */
1736 aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 }
1738 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1739
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001740out:
1741 unlock_kernel();
1742 return err ? : len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743}
1744
1745static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1746 size_t size, int flags)
1747{
1748 struct sock *sk = sock->sk;
1749 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1750 struct ddpehdr *ddp;
1751 int copied = 0;
Al Viro2a50f282006-09-26 21:22:08 -07001752 int offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 int err = 0;
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001754 struct sk_buff *skb;
1755
1756 lock_kernel();
1757 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 flags & MSG_DONTWAIT, &err);
1759 if (!skb)
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001760 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761
1762 /* FIXME: use skb->cb to be able to use shared skbs */
1763 ddp = ddp_hdr(skb);
Al Viro2a50f282006-09-26 21:22:08 -07001764 copied = ntohs(ddp->deh_len_hops) & 1023;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765
Al Viro2a50f282006-09-26 21:22:08 -07001766 if (sk->sk_type != SOCK_RAW) {
1767 offset = sizeof(*ddp);
1768 copied -= offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 }
1770
Al Viro2a50f282006-09-26 21:22:08 -07001771 if (copied > size) {
1772 copied = size;
1773 msg->msg_flags |= MSG_TRUNC;
1774 }
1775 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1776
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 if (!err) {
1778 if (sat) {
1779 sat->sat_family = AF_APPLETALK;
1780 sat->sat_port = ddp->deh_sport;
1781 sat->sat_addr.s_node = ddp->deh_snode;
1782 sat->sat_addr.s_net = ddp->deh_snet;
1783 }
1784 msg->msg_namelen = sizeof(*sat);
1785 }
1786
1787 skb_free_datagram(sk, skb); /* Free the datagram. */
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001788
1789out:
1790 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 return err ? : copied;
1792}
1793
1794
1795/*
1796 * AppleTalk ioctl calls.
1797 */
1798static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1799{
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -08001800 int rc = -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801 struct sock *sk = sock->sk;
1802 void __user *argp = (void __user *)arg;
1803
1804 switch (cmd) {
1805 /* Protocol layer */
1806 case TIOCOUTQ: {
Eric Dumazet31e6d362009-06-17 19:05:41 -07001807 long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808
1809 if (amount < 0)
1810 amount = 0;
1811 rc = put_user(amount, (int __user *)argp);
1812 break;
1813 }
1814 case TIOCINQ: {
1815 /*
1816 * These two are safe on a single CPU system as only
1817 * user tasks fiddle here
1818 */
1819 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1820 long amount = 0;
1821
1822 if (skb)
1823 amount = skb->len - sizeof(struct ddpehdr);
1824 rc = put_user(amount, (int __user *)argp);
1825 break;
1826 }
1827 case SIOCGSTAMP:
1828 rc = sock_get_timestamp(sk, argp);
1829 break;
Eric Dumazetae40eb12007-03-18 17:33:16 -07001830 case SIOCGSTAMPNS:
1831 rc = sock_get_timestampns(sk, argp);
1832 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 /* Routing */
1834 case SIOCADDRT:
1835 case SIOCDELRT:
1836 rc = -EPERM;
1837 if (capable(CAP_NET_ADMIN))
1838 rc = atrtr_ioctl(cmd, argp);
1839 break;
1840 /* Interface */
1841 case SIOCGIFADDR:
1842 case SIOCSIFADDR:
1843 case SIOCGIFBRDADDR:
1844 case SIOCATALKDIFADDR:
1845 case SIOCDIFADDR:
1846 case SIOCSARP: /* proxy AARP */
1847 case SIOCDARP: /* proxy AARP */
1848 rtnl_lock();
1849 rc = atif_ioctl(cmd, argp);
1850 rtnl_unlock();
1851 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852 }
1853
1854 return rc;
1855}
1856
Petr Vandrovecf6c90b72006-03-27 23:39:31 -08001857
1858#ifdef CONFIG_COMPAT
1859static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1860{
1861 /*
Arnd Bergmann20660222009-11-06 08:09:06 +00001862 * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
1863 * cannot handle it in common code. The data we access if ifreq
1864 * here is compatible, so we can simply call the native
1865 * handler.
Petr Vandrovecf6c90b72006-03-27 23:39:31 -08001866 */
Arnd Bergmann20660222009-11-06 08:09:06 +00001867 if (cmd == SIOCATALKDIFADDR)
1868 return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1869
Petr Vandrovecf6c90b72006-03-27 23:39:31 -08001870 return -ENOIOCTLCMD;
1871}
1872#endif
1873
1874
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00001875static const struct net_proto_family atalk_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 .family = PF_APPLETALK,
1877 .create = atalk_create,
1878 .owner = THIS_MODULE,
1879};
1880
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001881static const struct proto_ops atalk_dgram_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 .family = PF_APPLETALK,
1883 .owner = THIS_MODULE,
1884 .release = atalk_release,
1885 .bind = atalk_bind,
1886 .connect = atalk_connect,
1887 .socketpair = sock_no_socketpair,
1888 .accept = sock_no_accept,
1889 .getname = atalk_getname,
Arnd Bergmannecced8b2009-11-05 04:37:26 +00001890 .poll = atalk_poll,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 .ioctl = atalk_ioctl,
Petr Vandrovecf6c90b72006-03-27 23:39:31 -08001892#ifdef CONFIG_COMPAT
1893 .compat_ioctl = atalk_compat_ioctl,
1894#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895 .listen = sock_no_listen,
1896 .shutdown = sock_no_shutdown,
1897 .setsockopt = sock_no_setsockopt,
1898 .getsockopt = sock_no_getsockopt,
1899 .sendmsg = atalk_sendmsg,
1900 .recvmsg = atalk_recvmsg,
1901 .mmap = sock_no_mmap,
1902 .sendpage = sock_no_sendpage,
1903};
1904
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905static struct notifier_block ddp_notifier = {
1906 .notifier_call = ddp_device_event,
1907};
1908
Stephen Hemminger7546dd92009-03-09 08:18:29 +00001909static struct packet_type ltalk_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -08001910 .type = cpu_to_be16(ETH_P_LOCALTALK),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 .func = ltalk_rcv,
1912};
1913
Stephen Hemminger7546dd92009-03-09 08:18:29 +00001914static struct packet_type ppptalk_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -08001915 .type = cpu_to_be16(ETH_P_PPPTALK),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 .func = atalk_rcv,
1917};
1918
1919static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1920
1921/* Export symbols for use by drivers when AppleTalk is a module */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922EXPORT_SYMBOL(atrtr_get_dev);
1923EXPORT_SYMBOL(atalk_find_dev_addr);
1924
Hannes Eder2db09602009-02-25 10:31:59 +00001925static const char atalk_err_snap[] __initconst =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 KERN_CRIT "Unable to register DDP with SNAP.\n";
1927
1928/* Called by proto.c on kernel start up */
1929static int __init atalk_init(void)
1930{
1931 int rc = proto_register(&ddp_proto, 0);
1932
1933 if (rc != 0)
1934 goto out;
1935
1936 (void)sock_register(&atalk_family_ops);
1937 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1938 if (!ddp_dl)
1939 printk(atalk_err_snap);
1940
1941 dev_add_pack(&ltalk_packet_type);
1942 dev_add_pack(&ppptalk_packet_type);
1943
1944 register_netdevice_notifier(&ddp_notifier);
1945 aarp_proto_init();
1946 atalk_proc_init();
1947 atalk_register_sysctl();
1948out:
1949 return rc;
1950}
1951module_init(atalk_init);
1952
1953/*
1954 * No explicit module reference count manipulation is needed in the
1955 * protocol. Socket layer sets module reference count for us
1956 * and interfaces reference counting is done
1957 * by the network device layer.
1958 *
1959 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1960 * sockets be closed from user space.
1961 */
1962static void __exit atalk_exit(void)
1963{
1964#ifdef CONFIG_SYSCTL
1965 atalk_unregister_sysctl();
1966#endif /* CONFIG_SYSCTL */
1967 atalk_proc_exit();
1968 aarp_cleanup_module(); /* General aarp clean-up. */
1969 unregister_netdevice_notifier(&ddp_notifier);
1970 dev_remove_pack(&ltalk_packet_type);
1971 dev_remove_pack(&ppptalk_packet_type);
1972 unregister_snap_client(ddp_dl);
1973 sock_unregister(PF_APPLETALK);
1974 proto_unregister(&ddp_proto);
1975}
1976module_exit(atalk_exit);
1977
1978MODULE_LICENSE("GPL");
Alan Cox113aa832008-10-13 19:01:08 -07001979MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980MODULE_DESCRIPTION("AppleTalk 0.20\n");
1981MODULE_ALIAS_NETPROTO(PF_APPLETALK);