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[PATCH] oom: swapoff tasks tweak
[linux-2.6/verdex.git] / net / appletalk / ddp.c
blob96dc6bb52d14aecd00cff0e8f37bed950d6b557f
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/capability.h>
55 #include <linux/module.h>
56 #include <linux/if_arp.h>
57 #include <linux/termios.h> /* For TIOCOUTQ/INQ */
58 #include <net/datalink.h>
59 #include <net/psnap.h>
60 #include <net/sock.h>
61 #include <net/tcp_states.h>
62 #include <net/route.h>
63 #include <linux/atalk.h>
64
65 struct datalink_proto *ddp_dl, *aarp_dl;
66 static const 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 goto found;
105
106 if (to->sat_addr.s_net == at->src_net &&
107 (to->sat_addr.s_node == at->src_node ||
108 to->sat_addr.s_node == ATADDR_BCAST ||
109 to->sat_addr.s_node == ATADDR_ANYNODE))
110 goto found;
111
112 /* XXXX.0 -- we got a request for this router. make sure
113 * that the node is appropriately set. */
114 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
115 to->sat_addr.s_net != ATADDR_ANYNET &&
116 atif->address.s_node == at->src_node) {
117 to->sat_addr.s_node = atif->address.s_node;
118 goto found;
119 }
120 }
121 s = NULL;
122 found:
123 read_unlock_bh(&atalk_sockets_lock);
124 return s;
125 }
126
127 /**
128 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
129 * @sk - socket to insert in the list if it is not there already
130 * @sat - address to search for
131 *
132 * Try to find a socket matching ADDR in the socket list, if found then return
133 * it. If not, insert SK into the socket list.
134 *
135 * This entire operation must execute atomically.
136 */
137 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
138 struct sockaddr_at *sat)
139 {
140 struct sock *s;
141 struct hlist_node *node;
142 struct atalk_sock *at;
143
144 write_lock_bh(&atalk_sockets_lock);
145 sk_for_each(s, node, &atalk_sockets) {
146 at = at_sk(s);
147
148 if (at->src_net == sat->sat_addr.s_net &&
149 at->src_node == sat->sat_addr.s_node &&
150 at->src_port == sat->sat_port)
151 goto found;
152 }
153 s = NULL;
154 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
155 found:
156 write_unlock_bh(&atalk_sockets_lock);
157 return s;
158 }
159
160 static void atalk_destroy_timer(unsigned long data)
161 {
162 struct sock *sk = (struct sock *)data;
163
164 if (atomic_read(&sk->sk_wmem_alloc) ||
165 atomic_read(&sk->sk_rmem_alloc)) {
166 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
167 add_timer(&sk->sk_timer);
168 } else
169 sock_put(sk);
170 }
171
172 static inline void atalk_destroy_socket(struct sock *sk)
173 {
174 atalk_remove_socket(sk);
175 skb_queue_purge(&sk->sk_receive_queue);
176
177 if (atomic_read(&sk->sk_wmem_alloc) ||
178 atomic_read(&sk->sk_rmem_alloc)) {
179 init_timer(&sk->sk_timer);
180 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
181 sk->sk_timer.function = atalk_destroy_timer;
182 sk->sk_timer.data = (unsigned long)sk;
183 add_timer(&sk->sk_timer);
184 } else
185 sock_put(sk);
186 }
187
188 /**************************************************************************\
189 * *
190 * Routing tables for the AppleTalk socket layer. *
191 * *
192 \**************************************************************************/
193
194 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
195 struct atalk_route *atalk_routes;
196 DEFINE_RWLOCK(atalk_routes_lock);
197
198 struct atalk_iface *atalk_interfaces;
199 DEFINE_RWLOCK(atalk_interfaces_lock);
200
201 /* For probing devices or in a routerless network */
202 struct atalk_route atrtr_default;
203
204 /* AppleTalk interface control */
205 /*
206 * Drop a device. Doesn't drop any of its routes - that is the caller's
207 * problem. Called when we down the interface or delete the address.
208 */
209 static void atif_drop_device(struct net_device *dev)
210 {
211 struct atalk_iface **iface = &atalk_interfaces;
212 struct atalk_iface *tmp;
213
214 write_lock_bh(&atalk_interfaces_lock);
215 while ((tmp = *iface) != NULL) {
216 if (tmp->dev == dev) {
217 *iface = tmp->next;
218 dev_put(dev);
219 kfree(tmp);
220 dev->atalk_ptr = NULL;
221 } else
222 iface = &tmp->next;
223 }
224 write_unlock_bh(&atalk_interfaces_lock);
225 }
226
227 static struct atalk_iface *atif_add_device(struct net_device *dev,
228 struct atalk_addr *sa)
229 {
230 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
231
232 if (!iface)
233 goto out;
234
235 dev_hold(dev);
236 iface->dev = dev;
237 dev->atalk_ptr = iface;
238 iface->address = *sa;
239 iface->status = 0;
240
241 write_lock_bh(&atalk_interfaces_lock);
242 iface->next = atalk_interfaces;
243 atalk_interfaces = iface;
244 write_unlock_bh(&atalk_interfaces_lock);
245 out:
246 return iface;
247 }
248
249 /* Perform phase 2 AARP probing on our tentative address */
250 static int atif_probe_device(struct atalk_iface *atif)
251 {
252 int netrange = ntohs(atif->nets.nr_lastnet) -
253 ntohs(atif->nets.nr_firstnet) + 1;
254 int probe_net = ntohs(atif->address.s_net);
255 int probe_node = atif->address.s_node;
256 int netct, nodect;
257
258 /* Offset the network we start probing with */
259 if (probe_net == ATADDR_ANYNET) {
260 probe_net = ntohs(atif->nets.nr_firstnet);
261 if (netrange)
262 probe_net += jiffies % netrange;
263 }
264 if (probe_node == ATADDR_ANYNODE)
265 probe_node = jiffies & 0xFF;
266
267 /* Scan the networks */
268 atif->status |= ATIF_PROBE;
269 for (netct = 0; netct <= netrange; netct++) {
270 /* Sweep the available nodes from a given start */
271 atif->address.s_net = htons(probe_net);
272 for (nodect = 0; nodect < 256; nodect++) {
273 atif->address.s_node = (nodect + probe_node) & 0xFF;
274 if (atif->address.s_node > 0 &&
275 atif->address.s_node < 254) {
276 /* Probe a proposed address */
277 aarp_probe_network(atif);
278
279 if (!(atif->status & ATIF_PROBE_FAIL)) {
280 atif->status &= ~ATIF_PROBE;
281 return 0;
282 }
283 }
284 atif->status &= ~ATIF_PROBE_FAIL;
285 }
286 probe_net++;
287 if (probe_net > ntohs(atif->nets.nr_lastnet))
288 probe_net = ntohs(atif->nets.nr_firstnet);
289 }
290 atif->status &= ~ATIF_PROBE;
291
292 return -EADDRINUSE; /* Network is full... */
293 }
294
295
296 /* Perform AARP probing for a proxy address */
297 static int atif_proxy_probe_device(struct atalk_iface *atif,
298 struct atalk_addr* proxy_addr)
299 {
300 int netrange = ntohs(atif->nets.nr_lastnet) -
301 ntohs(atif->nets.nr_firstnet) + 1;
302 /* we probe the interface's network */
303 int probe_net = ntohs(atif->address.s_net);
304 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
305 int netct, nodect;
306
307 /* Offset the network we start probing with */
308 if (probe_net == ATADDR_ANYNET) {
309 probe_net = ntohs(atif->nets.nr_firstnet);
310 if (netrange)
311 probe_net += jiffies % netrange;
312 }
313
314 if (probe_node == ATADDR_ANYNODE)
315 probe_node = jiffies & 0xFF;
316
317 /* Scan the networks */
318 for (netct = 0; netct <= netrange; netct++) {
319 /* Sweep the available nodes from a given start */
320 proxy_addr->s_net = htons(probe_net);
321 for (nodect = 0; nodect < 256; nodect++) {
322 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
323 if (proxy_addr->s_node > 0 &&
324 proxy_addr->s_node < 254) {
325 /* Tell AARP to probe a proposed address */
326 int ret = aarp_proxy_probe_network(atif,
327 proxy_addr);
328
329 if (ret != -EADDRINUSE)
330 return ret;
331 }
332 }
333 probe_net++;
334 if (probe_net > ntohs(atif->nets.nr_lastnet))
335 probe_net = ntohs(atif->nets.nr_firstnet);
336 }
337
338 return -EADDRINUSE; /* Network is full... */
339 }
340
341
342 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
343 {
344 struct atalk_iface *iface = dev->atalk_ptr;
345 return iface ? &iface->address : NULL;
346 }
347
348 static struct atalk_addr *atalk_find_primary(void)
349 {
350 struct atalk_iface *fiface = NULL;
351 struct atalk_addr *retval;
352 struct atalk_iface *iface;
353
354 /*
355 * Return a point-to-point interface only if
356 * there is no non-ptp interface available.
357 */
358 read_lock_bh(&atalk_interfaces_lock);
359 for (iface = atalk_interfaces; iface; iface = iface->next) {
360 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
361 fiface = iface;
362 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
363 retval = &iface->address;
364 goto out;
365 }
366 }
367
368 if (fiface)
369 retval = &fiface->address;
370 else if (atalk_interfaces)
371 retval = &atalk_interfaces->address;
372 else
373 retval = NULL;
374 out:
375 read_unlock_bh(&atalk_interfaces_lock);
376 return retval;
377 }
378
379 /*
380 * Find a match for 'any network' - ie any of our interfaces with that
381 * node number will do just nicely.
382 */
383 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
384 {
385 struct atalk_iface *iface = dev->atalk_ptr;
386
387 if (!iface || iface->status & ATIF_PROBE)
388 goto out_err;
389
390 if (node != ATADDR_BCAST &&
391 iface->address.s_node != node &&
392 node != ATADDR_ANYNODE)
393 goto out_err;
394 out:
395 return iface;
396 out_err:
397 iface = NULL;
398 goto out;
399 }
400
401 /* Find a match for a specific network:node pair */
402 static struct atalk_iface *atalk_find_interface(__be16 net, int node)
403 {
404 struct atalk_iface *iface;
405
406 read_lock_bh(&atalk_interfaces_lock);
407 for (iface = atalk_interfaces; iface; iface = iface->next) {
408 if ((node == ATADDR_BCAST ||
409 node == ATADDR_ANYNODE ||
410 iface->address.s_node == node) &&
411 iface->address.s_net == net &&
412 !(iface->status & ATIF_PROBE))
413 break;
414
415 /* XXXX.0 -- net.0 returns the iface associated with net */
416 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
417 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
418 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
419 break;
420 }
421 read_unlock_bh(&atalk_interfaces_lock);
422 return iface;
423 }
424
425
426 /*
427 * Find a route for an AppleTalk packet. This ought to get cached in
428 * the socket (later on...). We know about host routes and the fact
429 * that a route must be direct to broadcast.
430 */
431 static struct atalk_route *atrtr_find(struct atalk_addr *target)
432 {
433 /*
434 * we must search through all routes unless we find a
435 * host route, because some host routes might overlap
436 * network routes
437 */
438 struct atalk_route *net_route = NULL;
439 struct atalk_route *r;
440
441 read_lock_bh(&atalk_routes_lock);
442 for (r = atalk_routes; r; r = r->next) {
443 if (!(r->flags & RTF_UP))
444 continue;
445
446 if (r->target.s_net == target->s_net) {
447 if (r->flags & RTF_HOST) {
448 /*
449 * if this host route is for the target,
450 * the we're done
451 */
452 if (r->target.s_node == target->s_node)
453 goto out;
454 } else
455 /*
456 * this route will work if there isn't a
457 * direct host route, so cache it
458 */
459 net_route = r;
460 }
461 }
462
463 /*
464 * if we found a network route but not a direct host
465 * route, then return it
466 */
467 if (net_route)
468 r = net_route;
469 else if (atrtr_default.dev)
470 r = &atrtr_default;
471 else /* No route can be found */
472 r = NULL;
473 out:
474 read_unlock_bh(&atalk_routes_lock);
475 return r;
476 }
477
478
479 /*
480 * Given an AppleTalk network, find the device to use. This can be
481 * a simple lookup.
482 */
483 struct net_device *atrtr_get_dev(struct atalk_addr *sa)
484 {
485 struct atalk_route *atr = atrtr_find(sa);
486 return atr ? atr->dev : NULL;
487 }
488
489 /* Set up a default router */
490 static void atrtr_set_default(struct net_device *dev)
491 {
492 atrtr_default.dev = dev;
493 atrtr_default.flags = RTF_UP;
494 atrtr_default.gateway.s_net = htons(0);
495 atrtr_default.gateway.s_node = 0;
496 }
497
498 /*
499 * Add a router. Basically make sure it looks valid and stuff the
500 * entry in the list. While it uses netranges we always set them to one
501 * entry to work like netatalk.
502 */
503 static int atrtr_create(struct rtentry *r, struct net_device *devhint)
504 {
505 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
506 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
507 struct atalk_route *rt;
508 struct atalk_iface *iface, *riface;
509 int retval = -EINVAL;
510
511 /*
512 * Fixme: Raise/Lower a routing change semaphore for these
513 * operations.
514 */
515
516 /* Validate the request */
517 if (ta->sat_family != AF_APPLETALK ||
518 (!devhint && ga->sat_family != AF_APPLETALK))
519 goto out;
520
521 /* Now walk the routing table and make our decisions */
522 write_lock_bh(&atalk_routes_lock);
523 for (rt = atalk_routes; rt; rt = rt->next) {
524 if (r->rt_flags != rt->flags)
525 continue;
526
527 if (ta->sat_addr.s_net == rt->target.s_net) {
528 if (!(rt->flags & RTF_HOST))
529 break;
530 if (ta->sat_addr.s_node == rt->target.s_node)
531 break;
532 }
533 }
534
535 if (!devhint) {
536 riface = NULL;
537
538 read_lock_bh(&atalk_interfaces_lock);
539 for (iface = atalk_interfaces; iface; iface = iface->next) {
540 if (!riface &&
541 ntohs(ga->sat_addr.s_net) >=
542 ntohs(iface->nets.nr_firstnet) &&
543 ntohs(ga->sat_addr.s_net) <=
544 ntohs(iface->nets.nr_lastnet))
545 riface = iface;
546
547 if (ga->sat_addr.s_net == iface->address.s_net &&
548 ga->sat_addr.s_node == iface->address.s_node)
549 riface = iface;
550 }
551 read_unlock_bh(&atalk_interfaces_lock);
552
553 retval = -ENETUNREACH;
554 if (!riface)
555 goto out_unlock;
556
557 devhint = riface->dev;
558 }
559
560 if (!rt) {
561 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
562
563 retval = -ENOBUFS;
564 if (!rt)
565 goto out_unlock;
566
567 rt->next = atalk_routes;
568 atalk_routes = rt;
569 }
570
571 /* Fill in the routing entry */
572 rt->target = ta->sat_addr;
573 dev_hold(devhint);
574 rt->dev = devhint;
575 rt->flags = r->rt_flags;
576 rt->gateway = ga->sat_addr;
577
578 retval = 0;
579 out_unlock:
580 write_unlock_bh(&atalk_routes_lock);
581 out:
582 return retval;
583 }
584
585 /* Delete a route. Find it and discard it */
586 static int atrtr_delete(struct atalk_addr * addr)
587 {
588 struct atalk_route **r = &atalk_routes;
589 int retval = 0;
590 struct atalk_route *tmp;
591
592 write_lock_bh(&atalk_routes_lock);
593 while ((tmp = *r) != NULL) {
594 if (tmp->target.s_net == addr->s_net &&
595 (!(tmp->flags&RTF_GATEWAY) ||
596 tmp->target.s_node == addr->s_node)) {
597 *r = tmp->next;
598 dev_put(tmp->dev);
599 kfree(tmp);
600 goto out;
601 }
602 r = &tmp->next;
603 }
604 retval = -ENOENT;
605 out:
606 write_unlock_bh(&atalk_routes_lock);
607 return retval;
608 }
609
610 /*
611 * Called when a device is downed. Just throw away any routes
612 * via it.
613 */
614 static void atrtr_device_down(struct net_device *dev)
615 {
616 struct atalk_route **r = &atalk_routes;
617 struct atalk_route *tmp;
618
619 write_lock_bh(&atalk_routes_lock);
620 while ((tmp = *r) != NULL) {
621 if (tmp->dev == dev) {
622 *r = tmp->next;
623 dev_put(dev);
624 kfree(tmp);
625 } else
626 r = &tmp->next;
627 }
628 write_unlock_bh(&atalk_routes_lock);
629
630 if (atrtr_default.dev == dev)
631 atrtr_set_default(NULL);
632 }
633
634 /* Actually down the interface */
635 static inline void atalk_dev_down(struct net_device *dev)
636 {
637 atrtr_device_down(dev); /* Remove all routes for the device */
638 aarp_device_down(dev); /* Remove AARP entries for the device */
639 atif_drop_device(dev); /* Remove the device */
640 }
641
642 /*
643 * A device event has occurred. Watch for devices going down and
644 * delete our use of them (iface and route).
645 */
646 static int ddp_device_event(struct notifier_block *this, unsigned long event,
647 void *ptr)
648 {
649 if (event == NETDEV_DOWN)
650 /* Discard any use of this */
651 atalk_dev_down(ptr);
652
653 return NOTIFY_DONE;
654 }
655
656 /* ioctl calls. Shouldn't even need touching */
657 /* Device configuration ioctl calls */
658 static int atif_ioctl(int cmd, void __user *arg)
659 {
660 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
661 struct ifreq atreq;
662 struct atalk_netrange *nr;
663 struct sockaddr_at *sa;
664 struct net_device *dev;
665 struct atalk_iface *atif;
666 int ct;
667 int limit;
668 struct rtentry rtdef;
669 int add_route;
670
671 if (copy_from_user(&atreq, arg, sizeof(atreq)))
672 return -EFAULT;
673
674 dev = __dev_get_by_name(atreq.ifr_name);
675 if (!dev)
676 return -ENODEV;
677
678 sa = (struct sockaddr_at *)&atreq.ifr_addr;
679 atif = atalk_find_dev(dev);
680
681 switch (cmd) {
682 case SIOCSIFADDR:
683 if (!capable(CAP_NET_ADMIN))
684 return -EPERM;
685 if (sa->sat_family != AF_APPLETALK)
686 return -EINVAL;
687 if (dev->type != ARPHRD_ETHER &&
688 dev->type != ARPHRD_LOOPBACK &&
689 dev->type != ARPHRD_LOCALTLK &&
690 dev->type != ARPHRD_PPP)
691 return -EPROTONOSUPPORT;
692
693 nr = (struct atalk_netrange *)&sa->sat_zero[0];
694 add_route = 1;
695
696 /*
697 * if this is a point-to-point iface, and we already
698 * have an iface for this AppleTalk address, then we
699 * should not add a route
700 */
701 if ((dev->flags & IFF_POINTOPOINT) &&
702 atalk_find_interface(sa->sat_addr.s_net,
703 sa->sat_addr.s_node)) {
704 printk(KERN_DEBUG "AppleTalk: point-to-point "
705 "interface added with "
706 "existing address\n");
707 add_route = 0;
708 }
709
710 /*
711 * Phase 1 is fine on LocalTalk but we don't do
712 * EtherTalk phase 1. Anyone wanting to add it go ahead.
713 */
714 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
715 return -EPROTONOSUPPORT;
716 if (sa->sat_addr.s_node == ATADDR_BCAST ||
717 sa->sat_addr.s_node == 254)
718 return -EINVAL;
719 if (atif) {
720 /* Already setting address */
721 if (atif->status & ATIF_PROBE)
722 return -EBUSY;
723
724 atif->address.s_net = sa->sat_addr.s_net;
725 atif->address.s_node = sa->sat_addr.s_node;
726 atrtr_device_down(dev); /* Flush old routes */
727 } else {
728 atif = atif_add_device(dev, &sa->sat_addr);
729 if (!atif)
730 return -ENOMEM;
731 }
732 atif->nets = *nr;
733
734 /*
735 * Check if the chosen address is used. If so we
736 * error and atalkd will try another.
737 */
738
739 if (!(dev->flags & IFF_LOOPBACK) &&
740 !(dev->flags & IFF_POINTOPOINT) &&
741 atif_probe_device(atif) < 0) {
742 atif_drop_device(dev);
743 return -EADDRINUSE;
744 }
745
746 /* Hey it worked - add the direct routes */
747 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
748 sa->sat_family = AF_APPLETALK;
749 sa->sat_addr.s_net = atif->address.s_net;
750 sa->sat_addr.s_node = atif->address.s_node;
751 sa = (struct sockaddr_at *)&rtdef.rt_dst;
752 rtdef.rt_flags = RTF_UP;
753 sa->sat_family = AF_APPLETALK;
754 sa->sat_addr.s_node = ATADDR_ANYNODE;
755 if (dev->flags & IFF_LOOPBACK ||
756 dev->flags & IFF_POINTOPOINT)
757 rtdef.rt_flags |= RTF_HOST;
758
759 /* Routerless initial state */
760 if (nr->nr_firstnet == htons(0) &&
761 nr->nr_lastnet == htons(0xFFFE)) {
762 sa->sat_addr.s_net = atif->address.s_net;
763 atrtr_create(&rtdef, dev);
764 atrtr_set_default(dev);
765 } else {
766 limit = ntohs(nr->nr_lastnet);
767 if (limit - ntohs(nr->nr_firstnet) > 4096) {
768 printk(KERN_WARNING "Too many routes/"
769 "iface.\n");
770 return -EINVAL;
771 }
772 if (add_route)
773 for (ct = ntohs(nr->nr_firstnet);
774 ct <= limit; ct++) {
775 sa->sat_addr.s_net = htons(ct);
776 atrtr_create(&rtdef, dev);
777 }
778 }
779 dev_mc_add(dev, aarp_mcast, 6, 1);
780 return 0;
781
782 case SIOCGIFADDR:
783 if (!atif)
784 return -EADDRNOTAVAIL;
785
786 sa->sat_family = AF_APPLETALK;
787 sa->sat_addr = atif->address;
788 break;
789
790 case SIOCGIFBRDADDR:
791 if (!atif)
792 return -EADDRNOTAVAIL;
793
794 sa->sat_family = AF_APPLETALK;
795 sa->sat_addr.s_net = atif->address.s_net;
796 sa->sat_addr.s_node = ATADDR_BCAST;
797 break;
798
799 case SIOCATALKDIFADDR:
800 case SIOCDIFADDR:
801 if (!capable(CAP_NET_ADMIN))
802 return -EPERM;
803 if (sa->sat_family != AF_APPLETALK)
804 return -EINVAL;
805 atalk_dev_down(dev);
806 break;
807
808 case SIOCSARP:
809 if (!capable(CAP_NET_ADMIN))
810 return -EPERM;
811 if (sa->sat_family != AF_APPLETALK)
812 return -EINVAL;
813 if (!atif)
814 return -EADDRNOTAVAIL;
815
816 /*
817 * for now, we only support proxy AARP on ELAP;
818 * we should be able to do it for LocalTalk, too.
819 */
820 if (dev->type != ARPHRD_ETHER)
821 return -EPROTONOSUPPORT;
822
823 /*
824 * atif points to the current interface on this network;
825 * we aren't concerned about its current status (at
826 * least for now), but it has all the settings about
827 * the network we're going to probe. Consequently, it
828 * must exist.
829 */
830 if (!atif)
831 return -EADDRNOTAVAIL;
832
833 nr = (struct atalk_netrange *)&(atif->nets);
834 /*
835 * Phase 1 is fine on Localtalk but we don't do
836 * Ethertalk phase 1. Anyone wanting to add it go ahead.
837 */
838 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
839 return -EPROTONOSUPPORT;
840
841 if (sa->sat_addr.s_node == ATADDR_BCAST ||
842 sa->sat_addr.s_node == 254)
843 return -EINVAL;
844
845 /*
846 * Check if the chosen address is used. If so we
847 * error and ATCP will try another.
848 */
849 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
850 return -EADDRINUSE;
851
852 /*
853 * We now have an address on the local network, and
854 * the AARP code will defend it for us until we take it
855 * down. We don't set up any routes right now, because
856 * ATCP will install them manually via SIOCADDRT.
857 */
858 break;
859
860 case SIOCDARP:
861 if (!capable(CAP_NET_ADMIN))
862 return -EPERM;
863 if (sa->sat_family != AF_APPLETALK)
864 return -EINVAL;
865 if (!atif)
866 return -EADDRNOTAVAIL;
867
868 /* give to aarp module to remove proxy entry */
869 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
870 return 0;
871 }
872
873 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
874 }
875
876 /* Routing ioctl() calls */
877 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
878 {
879 struct rtentry rt;
880
881 if (copy_from_user(&rt, arg, sizeof(rt)))
882 return -EFAULT;
883
884 switch (cmd) {
885 case SIOCDELRT:
886 if (rt.rt_dst.sa_family != AF_APPLETALK)
887 return -EINVAL;
888 return atrtr_delete(&((struct sockaddr_at *)
889 &rt.rt_dst)->sat_addr);
890
891 case SIOCADDRT: {
892 struct net_device *dev = NULL;
893 if (rt.rt_dev) {
894 char name[IFNAMSIZ];
895 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
896 return -EFAULT;
897 name[IFNAMSIZ-1] = '\0';
898 dev = __dev_get_by_name(name);
899 if (!dev)
900 return -ENODEV;
901 }
902 return atrtr_create(&rt, dev);
903 }
904 }
905 return -EINVAL;
906 }
907
908 /**************************************************************************\
909 * *
910 * Handling for system calls applied via the various interfaces to an *
911 * AppleTalk socket object. *
912 * *
913 \**************************************************************************/
914
915 /*
916 * Checksum: This is 'optional'. It's quite likely also a good
917 * candidate for assembler hackery 8)
918 */
919 static unsigned long atalk_sum_partial(const unsigned char *data,
920 int len, unsigned long sum)
921 {
922 /* This ought to be unwrapped neatly. I'll trust gcc for now */
923 while (len--) {
924 sum += *data;
925 sum <<= 1;
926 if (sum & 0x10000) {
927 sum++;
928 sum &= 0xffff;
929 }
930 data++;
931 }
932 return sum;
933 }
934
935 /* Checksum skb data -- similar to skb_checksum */
936 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
937 int len, unsigned long sum)
938 {
939 int start = skb_headlen(skb);
940 int i, copy;
941
942 /* checksum stuff in header space */
943 if ( (copy = start - offset) > 0) {
944 if (copy > len)
945 copy = len;
946 sum = atalk_sum_partial(skb->data + offset, copy, sum);
947 if ( (len -= copy) == 0)
948 return sum;
949
950 offset += copy;
951 }
952
953 /* checksum stuff in frags */
954 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
955 int end;
956
957 BUG_TRAP(start <= offset + len);
958
959 end = start + skb_shinfo(skb)->frags[i].size;
960 if ((copy = end - offset) > 0) {
961 u8 *vaddr;
962 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
963
964 if (copy > len)
965 copy = len;
966 vaddr = kmap_skb_frag(frag);
967 sum = atalk_sum_partial(vaddr + frag->page_offset +
968 offset - start, copy, sum);
969 kunmap_skb_frag(vaddr);
970
971 if (!(len -= copy))
972 return sum;
973 offset += copy;
974 }
975 start = end;
976 }
977
978 if (skb_shinfo(skb)->frag_list) {
979 struct sk_buff *list = skb_shinfo(skb)->frag_list;
980
981 for (; list; list = list->next) {
982 int end;
983
984 BUG_TRAP(start <= offset + len);
985
986 end = start + list->len;
987 if ((copy = end - offset) > 0) {
988 if (copy > len)
989 copy = len;
990 sum = atalk_sum_skb(list, offset - start,
991 copy, sum);
992 if ((len -= copy) == 0)
993 return sum;
994 offset += copy;
995 }
996 start = end;
997 }
998 }
999
1000 BUG_ON(len > 0);
1001
1002 return sum;
1003 }
1004
1005 static unsigned short atalk_checksum(const struct sk_buff *skb, int len)
1006 {
1007 unsigned long sum;
1008
1009 /* skip header 4 bytes */
1010 sum = atalk_sum_skb(skb, 4, len-4, 0);
1011
1012 /* Use 0xFFFF for 0. 0 itself means none */
1013 return sum ? htons((unsigned short)sum) : 0xFFFF;
1014 }
1015
1016 static struct proto ddp_proto = {
1017 .name = "DDP",
1018 .owner = THIS_MODULE,
1019 .obj_size = sizeof(struct atalk_sock),
1020 };
1021
1022 /*
1023 * Create a socket. Initialise the socket, blank the addresses
1024 * set the state.
1025 */
1026 static int atalk_create(struct socket *sock, int protocol)
1027 {
1028 struct sock *sk;
1029 int rc = -ESOCKTNOSUPPORT;
1030
1031 /*
1032 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1033 * and gives you the full ELAP frame. Should be handy for CAP 8)
1034 */
1035 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1036 goto out;
1037 rc = -ENOMEM;
1038 sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1);
1039 if (!sk)
1040 goto out;
1041 rc = 0;
1042 sock->ops = &atalk_dgram_ops;
1043 sock_init_data(sock, sk);
1044
1045 /* Checksums on by default */
1046 sock_set_flag(sk, SOCK_ZAPPED);
1047 out:
1048 return rc;
1049 }
1050
1051 /* Free a socket. No work needed */
1052 static int atalk_release(struct socket *sock)
1053 {
1054 struct sock *sk = sock->sk;
1055
1056 if (sk) {
1057 sock_orphan(sk);
1058 sock->sk = NULL;
1059 atalk_destroy_socket(sk);
1060 }
1061 return 0;
1062 }
1063
1064 /**
1065 * atalk_pick_and_bind_port - Pick a source port when one is not given
1066 * @sk - socket to insert into the tables
1067 * @sat - address to search for
1068 *
1069 * Pick a source port when one is not given. If we can find a suitable free
1070 * one, we insert the socket into the tables using it.
1071 *
1072 * This whole operation must be atomic.
1073 */
1074 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1075 {
1076 int retval;
1077
1078 write_lock_bh(&atalk_sockets_lock);
1079
1080 for (sat->sat_port = ATPORT_RESERVED;
1081 sat->sat_port < ATPORT_LAST;
1082 sat->sat_port++) {
1083 struct sock *s;
1084 struct hlist_node *node;
1085
1086 sk_for_each(s, node, &atalk_sockets) {
1087 struct atalk_sock *at = at_sk(s);
1088
1089 if (at->src_net == sat->sat_addr.s_net &&
1090 at->src_node == sat->sat_addr.s_node &&
1091 at->src_port == sat->sat_port)
1092 goto try_next_port;
1093 }
1094
1095 /* Wheee, it's free, assign and insert. */
1096 __atalk_insert_socket(sk);
1097 at_sk(sk)->src_port = sat->sat_port;
1098 retval = 0;
1099 goto out;
1100
1101 try_next_port:;
1102 }
1103
1104 retval = -EBUSY;
1105 out:
1106 write_unlock_bh(&atalk_sockets_lock);
1107 return retval;
1108 }
1109
1110 static int atalk_autobind(struct sock *sk)
1111 {
1112 struct atalk_sock *at = at_sk(sk);
1113 struct sockaddr_at sat;
1114 struct atalk_addr *ap = atalk_find_primary();
1115 int n = -EADDRNOTAVAIL;
1116
1117 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1118 goto out;
1119
1120 at->src_net = sat.sat_addr.s_net = ap->s_net;
1121 at->src_node = sat.sat_addr.s_node = ap->s_node;
1122
1123 n = atalk_pick_and_bind_port(sk, &sat);
1124 if (!n)
1125 sock_reset_flag(sk, SOCK_ZAPPED);
1126 out:
1127 return n;
1128 }
1129
1130 /* Set the address 'our end' of the connection */
1131 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1132 {
1133 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1134 struct sock *sk = sock->sk;
1135 struct atalk_sock *at = at_sk(sk);
1136
1137 if (!sock_flag(sk, SOCK_ZAPPED) ||
1138 addr_len != sizeof(struct sockaddr_at))
1139 return -EINVAL;
1140
1141 if (addr->sat_family != AF_APPLETALK)
1142 return -EAFNOSUPPORT;
1143
1144 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1145 struct atalk_addr *ap = atalk_find_primary();
1146
1147 if (!ap)
1148 return -EADDRNOTAVAIL;
1149
1150 at->src_net = addr->sat_addr.s_net = ap->s_net;
1151 at->src_node = addr->sat_addr.s_node= ap->s_node;
1152 } else {
1153 if (!atalk_find_interface(addr->sat_addr.s_net,
1154 addr->sat_addr.s_node))
1155 return -EADDRNOTAVAIL;
1156
1157 at->src_net = addr->sat_addr.s_net;
1158 at->src_node = addr->sat_addr.s_node;
1159 }
1160
1161 if (addr->sat_port == ATADDR_ANYPORT) {
1162 int n = atalk_pick_and_bind_port(sk, addr);
1163
1164 if (n < 0)
1165 return n;
1166 } else {
1167 at->src_port = addr->sat_port;
1168
1169 if (atalk_find_or_insert_socket(sk, addr))
1170 return -EADDRINUSE;
1171 }
1172
1173 sock_reset_flag(sk, SOCK_ZAPPED);
1174 return 0;
1175 }
1176
1177 /* Set the address we talk to */
1178 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1179 int addr_len, int flags)
1180 {
1181 struct sock *sk = sock->sk;
1182 struct atalk_sock *at = at_sk(sk);
1183 struct sockaddr_at *addr;
1184
1185 sk->sk_state = TCP_CLOSE;
1186 sock->state = SS_UNCONNECTED;
1187
1188 if (addr_len != sizeof(*addr))
1189 return -EINVAL;
1190
1191 addr = (struct sockaddr_at *)uaddr;
1192
1193 if (addr->sat_family != AF_APPLETALK)
1194 return -EAFNOSUPPORT;
1195
1196 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1197 !sock_flag(sk, SOCK_BROADCAST)) {
1198 #if 1
1199 printk(KERN_WARNING "%s is broken and did not set "
1200 "SO_BROADCAST. It will break when 2.2 is "
1201 "released.\n",
1202 current->comm);
1203 #else
1204 return -EACCES;
1205 #endif
1206 }
1207
1208 if (sock_flag(sk, SOCK_ZAPPED))
1209 if (atalk_autobind(sk) < 0)
1210 return -EBUSY;
1211
1212 if (!atrtr_get_dev(&addr->sat_addr))
1213 return -ENETUNREACH;
1214
1215 at->dest_port = addr->sat_port;
1216 at->dest_net = addr->sat_addr.s_net;
1217 at->dest_node = addr->sat_addr.s_node;
1218
1219 sock->state = SS_CONNECTED;
1220 sk->sk_state = TCP_ESTABLISHED;
1221 return 0;
1222 }
1223
1224 /*
1225 * Find the name of an AppleTalk socket. Just copy the right
1226 * fields into the sockaddr.
1227 */
1228 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1229 int *uaddr_len, int peer)
1230 {
1231 struct sockaddr_at sat;
1232 struct sock *sk = sock->sk;
1233 struct atalk_sock *at = at_sk(sk);
1234
1235 if (sock_flag(sk, SOCK_ZAPPED))
1236 if (atalk_autobind(sk) < 0)
1237 return -ENOBUFS;
1238
1239 *uaddr_len = sizeof(struct sockaddr_at);
1240
1241 if (peer) {
1242 if (sk->sk_state != TCP_ESTABLISHED)
1243 return -ENOTCONN;
1244
1245 sat.sat_addr.s_net = at->dest_net;
1246 sat.sat_addr.s_node = at->dest_node;
1247 sat.sat_port = at->dest_port;
1248 } else {
1249 sat.sat_addr.s_net = at->src_net;
1250 sat.sat_addr.s_node = at->src_node;
1251 sat.sat_port = at->src_port;
1252 }
1253
1254 sat.sat_family = AF_APPLETALK;
1255 memcpy(uaddr, &sat, sizeof(sat));
1256 return 0;
1257 }
1258
1259 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1260 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1261 {
1262 return skb->data[12] == 22;
1263 }
1264
1265 static int handle_ip_over_ddp(struct sk_buff *skb)
1266 {
1267 struct net_device *dev = __dev_get_by_name("ipddp0");
1268 struct net_device_stats *stats;
1269
1270 /* This needs to be able to handle ipddp"N" devices */
1271 if (!dev)
1272 return -ENODEV;
1273
1274 skb->protocol = htons(ETH_P_IP);
1275 skb_pull(skb, 13);
1276 skb->dev = dev;
1277 skb->h.raw = skb->data;
1278
1279 stats = dev->priv;
1280 stats->rx_packets++;
1281 stats->rx_bytes += skb->len + 13;
1282 netif_rx(skb); /* Send the SKB up to a higher place. */
1283 return 0;
1284 }
1285 #else
1286 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1287 #define is_ip_over_ddp(skb) 0
1288 #define handle_ip_over_ddp(skb) 0
1289 #endif
1290
1291 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1292 struct ddpehdr *ddp, struct ddpebits *ddphv,
1293 int origlen)
1294 {
1295 struct atalk_route *rt;
1296 struct atalk_addr ta;
1297
1298 /*
1299 * Don't route multicast, etc., packets, or packets sent to "this
1300 * network"
1301 */
1302 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1303 /*
1304 * FIXME:
1305 *
1306 * Can it ever happen that a packet is from a PPP iface and
1307 * needs to be broadcast onto the default network?
1308 */
1309 if (dev->type == ARPHRD_PPP)
1310 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1311 "packet received from PPP iface\n");
1312 goto free_it;
1313 }
1314
1315 ta.s_net = ddp->deh_dnet;
1316 ta.s_node = ddp->deh_dnode;
1317
1318 /* Route the packet */
1319 rt = atrtr_find(&ta);
1320 if (!rt || ddphv->deh_hops == DDP_MAXHOPS)
1321 goto free_it;
1322 /* FIXME: use skb->cb to be able to use shared skbs */
1323 ddphv->deh_hops++;
1324
1325 /*
1326 * Route goes through another gateway, so set the target to the
1327 * gateway instead.
1328 */
1329
1330 if (rt->flags & RTF_GATEWAY) {
1331 ta.s_net = rt->gateway.s_net;
1332 ta.s_node = rt->gateway.s_node;
1333 }
1334
1335 /* Fix up skb->len field */
1336 skb_trim(skb, min_t(unsigned int, origlen,
1337 (rt->dev->hard_header_len +
1338 ddp_dl->header_length + ddphv->deh_len)));
1339
1340 /* Mend the byte order */
1341 /* FIXME: use skb->cb to be able to use shared skbs */
1342 *((__u16 *)ddp) = ntohs(*((__u16 *)ddphv));
1343
1344 /*
1345 * Send the buffer onwards
1346 *
1347 * Now we must always be careful. If it's come from LocalTalk to
1348 * EtherTalk it might not fit
1349 *
1350 * Order matters here: If a packet has to be copied to make a new
1351 * headroom (rare hopefully) then it won't need unsharing.
1352 *
1353 * Note. ddp-> becomes invalid at the realloc.
1354 */
1355 if (skb_headroom(skb) < 22) {
1356 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1357 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1358 kfree_skb(skb);
1359 if (!nskb)
1360 goto out;
1361 skb = nskb;
1362 } else
1363 skb = skb_unshare(skb, GFP_ATOMIC);
1364
1365 /*
1366 * If the buffer didn't vanish into the lack of space bitbucket we can
1367 * send it.
1368 */
1369 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1370 goto free_it;
1371 out:
1372 return;
1373 free_it:
1374 kfree_skb(skb);
1375 }
1376
1377 /**
1378 * atalk_rcv - Receive a packet (in skb) from device dev
1379 * @skb - packet received
1380 * @dev - network device where the packet comes from
1381 * @pt - packet type
1382 *
1383 * Receive a packet (in skb) from device dev. This has come from the SNAP
1384 * decoder, and on entry skb->h.raw is the DDP header, skb->len is the DDP
1385 * header, skb->len is the DDP length. The physical headers have been
1386 * extracted. PPP should probably pass frames marked as for this layer.
1387 * [ie ARPHRD_ETHERTALK]
1388 */
1389 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1390 struct packet_type *pt, struct net_device *orig_dev)
1391 {
1392 struct ddpehdr *ddp;
1393 struct sock *sock;
1394 struct atalk_iface *atif;
1395 struct sockaddr_at tosat;
1396 int origlen;
1397 struct ddpebits ddphv;
1398
1399 /* Don't mangle buffer if shared */
1400 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1401 goto out;
1402
1403 /* Size check and make sure header is contiguous */
1404 if (!pskb_may_pull(skb, sizeof(*ddp)))
1405 goto freeit;
1406
1407 ddp = ddp_hdr(skb);
1408
1409 /*
1410 * Fix up the length field [Ok this is horrible but otherwise
1411 * I end up with unions of bit fields and messy bit field order
1412 * compiler/endian dependencies..]
1413 */
1414 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1415
1416 /* Trim buffer in case of stray trailing data */
1417 origlen = skb->len;
1418 skb_trim(skb, min_t(unsigned int, skb->len, ddphv.deh_len));
1419
1420 /*
1421 * Size check to see if ddp->deh_len was crap
1422 * (Otherwise we'll detonate most spectacularly
1423 * in the middle of recvmsg()).
1424 */
1425 if (skb->len < sizeof(*ddp))
1426 goto freeit;
1427
1428 /*
1429 * Any checksums. Note we don't do htons() on this == is assumed to be
1430 * valid for net byte orders all over the networking code...
1431 */
1432 if (ddp->deh_sum &&
1433 atalk_checksum(skb, ddphv.deh_len) != ddp->deh_sum)
1434 /* Not a valid AppleTalk frame - dustbin time */
1435 goto freeit;
1436
1437 /* Check the packet is aimed at us */
1438 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1439 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1440 else
1441 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1442
1443 if (!atif) {
1444 /* Not ours, so we route the packet via the correct
1445 * AppleTalk iface
1446 */
1447 atalk_route_packet(skb, dev, ddp, &ddphv, origlen);
1448 goto out;
1449 }
1450
1451 /* if IP over DDP is not selected this code will be optimized out */
1452 if (is_ip_over_ddp(skb))
1453 return handle_ip_over_ddp(skb);
1454 /*
1455 * Which socket - atalk_search_socket() looks for a *full match*
1456 * of the <net, node, port> tuple.
1457 */
1458 tosat.sat_addr.s_net = ddp->deh_dnet;
1459 tosat.sat_addr.s_node = ddp->deh_dnode;
1460 tosat.sat_port = ddp->deh_dport;
1461
1462 sock = atalk_search_socket(&tosat, atif);
1463 if (!sock) /* But not one of our sockets */
1464 goto freeit;
1465
1466 /* Queue packet (standard) */
1467 skb->sk = sock;
1468
1469 if (sock_queue_rcv_skb(sock, skb) < 0)
1470 goto freeit;
1471 out:
1472 return 0;
1473 freeit:
1474 kfree_skb(skb);
1475 goto out;
1476 }
1477
1478 /*
1479 * Receive a LocalTalk frame. We make some demands on the caller here.
1480 * Caller must provide enough headroom on the packet to pull the short
1481 * header and append a long one.
1482 */
1483 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1484 struct packet_type *pt, struct net_device *orig_dev)
1485 {
1486 /* Expand any short form frames */
1487 if (skb->mac.raw[2] == 1) {
1488 struct ddpehdr *ddp;
1489 /* Find our address */
1490 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1491
1492 if (!ap || skb->len < sizeof(struct ddpshdr))
1493 goto freeit;
1494
1495 /* Don't mangle buffer if shared */
1496 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1497 return 0;
1498
1499 /*
1500 * The push leaves us with a ddephdr not an shdr, and
1501 * handily the port bytes in the right place preset.
1502 */
1503 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1504
1505 /* Now fill in the long header */
1506
1507 /*
1508 * These two first. The mac overlays the new source/dest
1509 * network information so we MUST copy these before
1510 * we write the network numbers !
1511 */
1512
1513 ddp->deh_dnode = skb->mac.raw[0]; /* From physical header */
1514 ddp->deh_snode = skb->mac.raw[1]; /* From physical header */
1515
1516 ddp->deh_dnet = ap->s_net; /* Network number */
1517 ddp->deh_snet = ap->s_net;
1518 ddp->deh_sum = 0; /* No checksum */
1519 /*
1520 * Not sure about this bit...
1521 */
1522 ddp->deh_len = skb->len;
1523 ddp->deh_hops = DDP_MAXHOPS; /* Non routable, so force a drop
1524 if we slip up later */
1525 /* Mend the byte order */
1526 *((__u16 *)ddp) = htons(*((__u16 *)ddp));
1527 }
1528 skb->h.raw = skb->data;
1529
1530 return atalk_rcv(skb, dev, pt, orig_dev);
1531 freeit:
1532 kfree_skb(skb);
1533 return 0;
1534 }
1535
1536 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1537 size_t len)
1538 {
1539 struct sock *sk = sock->sk;
1540 struct atalk_sock *at = at_sk(sk);
1541 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1542 int flags = msg->msg_flags;
1543 int loopback = 0;
1544 struct sockaddr_at local_satalk, gsat;
1545 struct sk_buff *skb;
1546 struct net_device *dev;
1547 struct ddpehdr *ddp;
1548 int size;
1549 struct atalk_route *rt;
1550 int err;
1551
1552 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1553 return -EINVAL;
1554
1555 if (len > DDP_MAXSZ)
1556 return -EMSGSIZE;
1557
1558 if (usat) {
1559 if (sock_flag(sk, SOCK_ZAPPED))
1560 if (atalk_autobind(sk) < 0)
1561 return -EBUSY;
1562
1563 if (msg->msg_namelen < sizeof(*usat) ||
1564 usat->sat_family != AF_APPLETALK)
1565 return -EINVAL;
1566
1567 /* netatalk doesn't implement this check */
1568 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1569 !sock_flag(sk, SOCK_BROADCAST)) {
1570 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1571 "it will break before 2.2\n");
1572 #if 0
1573 return -EPERM;
1574 #endif
1575 }
1576 } else {
1577 if (sk->sk_state != TCP_ESTABLISHED)
1578 return -ENOTCONN;
1579 usat = &local_satalk;
1580 usat->sat_family = AF_APPLETALK;
1581 usat->sat_port = at->dest_port;
1582 usat->sat_addr.s_node = at->dest_node;
1583 usat->sat_addr.s_net = at->dest_net;
1584 }
1585
1586 /* Build a packet */
1587 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1588
1589 /* For headers */
1590 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1591
1592 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1593 rt = atrtr_find(&usat->sat_addr);
1594 dev = rt->dev;
1595 } else {
1596 struct atalk_addr at_hint;
1597
1598 at_hint.s_node = 0;
1599 at_hint.s_net = at->src_net;
1600
1601 rt = atrtr_find(&at_hint);
1602 dev = rt->dev;
1603 }
1604 if (!rt)
1605 return -ENETUNREACH;
1606
1607 dev = rt->dev;
1608
1609 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1610 sk, size, dev->name);
1611
1612 size += dev->hard_header_len;
1613 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1614 if (!skb)
1615 return err;
1616
1617 skb->sk = sk;
1618 skb_reserve(skb, ddp_dl->header_length);
1619 skb_reserve(skb, dev->hard_header_len);
1620 skb->dev = dev;
1621
1622 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1623
1624 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1625 ddp->deh_pad = 0;
1626 ddp->deh_hops = 0;
1627 ddp->deh_len = len + sizeof(*ddp);
1628 /*
1629 * Fix up the length field [Ok this is horrible but otherwise
1630 * I end up with unions of bit fields and messy bit field order
1631 * compiler/endian dependencies..
1632 */
1633 *((__u16 *)ddp) = ntohs(*((__u16 *)ddp));
1634
1635 ddp->deh_dnet = usat->sat_addr.s_net;
1636 ddp->deh_snet = at->src_net;
1637 ddp->deh_dnode = usat->sat_addr.s_node;
1638 ddp->deh_snode = at->src_node;
1639 ddp->deh_dport = usat->sat_port;
1640 ddp->deh_sport = at->src_port;
1641
1642 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1643
1644 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1645 if (err) {
1646 kfree_skb(skb);
1647 return -EFAULT;
1648 }
1649
1650 if (sk->sk_no_check == 1)
1651 ddp->deh_sum = 0;
1652 else
1653 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1654
1655 /*
1656 * Loopback broadcast packets to non gateway targets (ie routes
1657 * to group we are in)
1658 */
1659 if (ddp->deh_dnode == ATADDR_BCAST &&
1660 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1661 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1662
1663 if (skb2) {
1664 loopback = 1;
1665 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1666 if (aarp_send_ddp(dev, skb2,
1667 &usat->sat_addr, NULL) == -1)
1668 kfree_skb(skb2);
1669 /* else queued/sent above in the aarp queue */
1670 }
1671 }
1672
1673 if (dev->flags & IFF_LOOPBACK || loopback) {
1674 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1675 /* loop back */
1676 skb_orphan(skb);
1677 if (ddp->deh_dnode == ATADDR_BCAST) {
1678 struct atalk_addr at_lo;
1679
1680 at_lo.s_node = 0;
1681 at_lo.s_net = 0;
1682
1683 rt = atrtr_find(&at_lo);
1684 if (!rt) {
1685 kfree_skb(skb);
1686 return -ENETUNREACH;
1687 }
1688 dev = rt->dev;
1689 skb->dev = dev;
1690 }
1691 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1692 } else {
1693 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1694 if (rt->flags & RTF_GATEWAY) {
1695 gsat.sat_addr = rt->gateway;
1696 usat = &gsat;
1697 }
1698
1699 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1700 kfree_skb(skb);
1701 /* else queued/sent above in the aarp queue */
1702 }
1703 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1704
1705 return len;
1706 }
1707
1708 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1709 size_t size, int flags)
1710 {
1711 struct sock *sk = sock->sk;
1712 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1713 struct ddpehdr *ddp;
1714 int copied = 0;
1715 int err = 0;
1716 struct ddpebits ddphv;
1717 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1718 flags & MSG_DONTWAIT, &err);
1719 if (!skb)
1720 return err;
1721
1722 /* FIXME: use skb->cb to be able to use shared skbs */
1723 ddp = ddp_hdr(skb);
1724 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1725
1726 if (sk->sk_type == SOCK_RAW) {
1727 copied = ddphv.deh_len;
1728 if (copied > size) {
1729 copied = size;
1730 msg->msg_flags |= MSG_TRUNC;
1731 }
1732
1733 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1734 } else {
1735 copied = ddphv.deh_len - sizeof(*ddp);
1736 if (copied > size) {
1737 copied = size;
1738 msg->msg_flags |= MSG_TRUNC;
1739 }
1740 err = skb_copy_datagram_iovec(skb, sizeof(*ddp),
1741 msg->msg_iov, copied);
1742 }
1743
1744 if (!err) {
1745 if (sat) {
1746 sat->sat_family = AF_APPLETALK;
1747 sat->sat_port = ddp->deh_sport;
1748 sat->sat_addr.s_node = ddp->deh_snode;
1749 sat->sat_addr.s_net = ddp->deh_snet;
1750 }
1751 msg->msg_namelen = sizeof(*sat);
1752 }
1753
1754 skb_free_datagram(sk, skb); /* Free the datagram. */
1755 return err ? : copied;
1756 }
1757
1758
1759 /*
1760 * AppleTalk ioctl calls.
1761 */
1762 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1763 {
1764 int rc = -ENOIOCTLCMD;
1765 struct sock *sk = sock->sk;
1766 void __user *argp = (void __user *)arg;
1767
1768 switch (cmd) {
1769 /* Protocol layer */
1770 case TIOCOUTQ: {
1771 long amount = sk->sk_sndbuf -
1772 atomic_read(&sk->sk_wmem_alloc);
1773
1774 if (amount < 0)
1775 amount = 0;
1776 rc = put_user(amount, (int __user *)argp);
1777 break;
1778 }
1779 case TIOCINQ: {
1780 /*
1781 * These two are safe on a single CPU system as only
1782 * user tasks fiddle here
1783 */
1784 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1785 long amount = 0;
1786
1787 if (skb)
1788 amount = skb->len - sizeof(struct ddpehdr);
1789 rc = put_user(amount, (int __user *)argp);
1790 break;
1791 }
1792 case SIOCGSTAMP:
1793 rc = sock_get_timestamp(sk, argp);
1794 break;
1795 /* Routing */
1796 case SIOCADDRT:
1797 case SIOCDELRT:
1798 rc = -EPERM;
1799 if (capable(CAP_NET_ADMIN))
1800 rc = atrtr_ioctl(cmd, argp);
1801 break;
1802 /* Interface */
1803 case SIOCGIFADDR:
1804 case SIOCSIFADDR:
1805 case SIOCGIFBRDADDR:
1806 case SIOCATALKDIFADDR:
1807 case SIOCDIFADDR:
1808 case SIOCSARP: /* proxy AARP */
1809 case SIOCDARP: /* proxy AARP */
1810 rtnl_lock();
1811 rc = atif_ioctl(cmd, argp);
1812 rtnl_unlock();
1813 break;
1814 }
1815
1816 return rc;
1817 }
1818
1819
1820 #ifdef CONFIG_COMPAT
1821 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1822 {
1823 /*
1824 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And
1825 * SIOCATALKDIFADDR is handled by upper layer as well, so there is
1826 * nothing to do. Eventually SIOCATALKDIFADDR should be moved
1827 * here so there is no generic SIOCPROTOPRIVATE translation in the
1828 * system.
1829 */
1830 return -ENOIOCTLCMD;
1831 }
1832 #endif
1833
1834
1835 static struct net_proto_family atalk_family_ops = {
1836 .family = PF_APPLETALK,
1837 .create = atalk_create,
1838 .owner = THIS_MODULE,
1839 };
1840
1841 static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1842 .family = PF_APPLETALK,
1843 .owner = THIS_MODULE,
1844 .release = atalk_release,
1845 .bind = atalk_bind,
1846 .connect = atalk_connect,
1847 .socketpair = sock_no_socketpair,
1848 .accept = sock_no_accept,
1849 .getname = atalk_getname,
1850 .poll = datagram_poll,
1851 .ioctl = atalk_ioctl,
1852 #ifdef CONFIG_COMPAT
1853 .compat_ioctl = atalk_compat_ioctl,
1854 #endif
1855 .listen = sock_no_listen,
1856 .shutdown = sock_no_shutdown,
1857 .setsockopt = sock_no_setsockopt,
1858 .getsockopt = sock_no_getsockopt,
1859 .sendmsg = atalk_sendmsg,
1860 .recvmsg = atalk_recvmsg,
1861 .mmap = sock_no_mmap,
1862 .sendpage = sock_no_sendpage,
1863 };
1864
1865 #include <linux/smp_lock.h>
1866 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1867
1868 static struct notifier_block ddp_notifier = {
1869 .notifier_call = ddp_device_event,
1870 };
1871
1872 static struct packet_type ltalk_packet_type = {
1873 .type = __constant_htons(ETH_P_LOCALTALK),
1874 .func = ltalk_rcv,
1875 };
1876
1877 static struct packet_type ppptalk_packet_type = {
1878 .type = __constant_htons(ETH_P_PPPTALK),
1879 .func = atalk_rcv,
1880 };
1881
1882 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1883
1884 /* Export symbols for use by drivers when AppleTalk is a module */
1885 EXPORT_SYMBOL(aarp_send_ddp);
1886 EXPORT_SYMBOL(atrtr_get_dev);
1887 EXPORT_SYMBOL(atalk_find_dev_addr);
1888
1889 static char atalk_err_snap[] __initdata =
1890 KERN_CRIT "Unable to register DDP with SNAP.\n";
1891
1892 /* Called by proto.c on kernel start up */
1893 static int __init atalk_init(void)
1894 {
1895 int rc = proto_register(&ddp_proto, 0);
1896
1897 if (rc != 0)
1898 goto out;
1899
1900 (void)sock_register(&atalk_family_ops);
1901 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1902 if (!ddp_dl)
1903 printk(atalk_err_snap);
1904
1905 dev_add_pack(&ltalk_packet_type);
1906 dev_add_pack(&ppptalk_packet_type);
1907
1908 register_netdevice_notifier(&ddp_notifier);
1909 aarp_proto_init();
1910 atalk_proc_init();
1911 atalk_register_sysctl();
1912 out:
1913 return rc;
1914 }
1915 module_init(atalk_init);
1916
1917 /*
1918 * No explicit module reference count manipulation is needed in the
1919 * protocol. Socket layer sets module reference count for us
1920 * and interfaces reference counting is done
1921 * by the network device layer.
1922 *
1923 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1924 * sockets be closed from user space.
1925 */
1926 static void __exit atalk_exit(void)
1927 {
1928 #ifdef CONFIG_SYSCTL
1929 atalk_unregister_sysctl();
1930 #endif /* CONFIG_SYSCTL */
1931 atalk_proc_exit();
1932 aarp_cleanup_module(); /* General aarp clean-up. */
1933 unregister_netdevice_notifier(&ddp_notifier);
1934 dev_remove_pack(&ltalk_packet_type);
1935 dev_remove_pack(&ppptalk_packet_type);
1936 unregister_snap_client(ddp_dl);
1937 sock_unregister(PF_APPLETALK);
1938 proto_unregister(&ddp_proto);
1939 }
1940 module_exit(atalk_exit);
1941
1942 MODULE_LICENSE("GPL");
1943 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1944 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1945 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
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