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[XFRM]: Algorithm lookup using .compat name
[linux-2.6.22.y-op.git] / net / appletalk / ddp.c
blob3a7052207708eb8f834480f7f3d56a5684cf5e28
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 #include "../core/kmap_skb.h"
65
66 struct datalink_proto *ddp_dl, *aarp_dl;
67 static const struct proto_ops atalk_dgram_ops;
68
69 /**************************************************************************\
70 * *
71 * Handlers for the socket list. *
72 * *
73 \**************************************************************************/
74
75 HLIST_HEAD(atalk_sockets);
76 DEFINE_RWLOCK(atalk_sockets_lock);
77
78 static inline void __atalk_insert_socket(struct sock *sk)
79 {
80 sk_add_node(sk, &atalk_sockets);
81 }
82
83 static inline void atalk_remove_socket(struct sock *sk)
84 {
85 write_lock_bh(&atalk_sockets_lock);
86 sk_del_node_init(sk);
87 write_unlock_bh(&atalk_sockets_lock);
88 }
89
90 static struct sock *atalk_search_socket(struct sockaddr_at *to,
91 struct atalk_iface *atif)
92 {
93 struct sock *s;
94 struct hlist_node *node;
95
96 read_lock_bh(&atalk_sockets_lock);
97 sk_for_each(s, node, &atalk_sockets) {
98 struct atalk_sock *at = at_sk(s);
99
100 if (to->sat_port != at->src_port)
101 continue;
102
103 if (to->sat_addr.s_net == ATADDR_ANYNET &&
104 to->sat_addr.s_node == ATADDR_BCAST)
105 goto found;
106
107 if (to->sat_addr.s_net == at->src_net &&
108 (to->sat_addr.s_node == at->src_node ||
109 to->sat_addr.s_node == ATADDR_BCAST ||
110 to->sat_addr.s_node == ATADDR_ANYNODE))
111 goto found;
112
113 /* XXXX.0 -- we got a request for this router. make sure
114 * that the node is appropriately set. */
115 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
116 to->sat_addr.s_net != ATADDR_ANYNET &&
117 atif->address.s_node == at->src_node) {
118 to->sat_addr.s_node = atif->address.s_node;
119 goto found;
120 }
121 }
122 s = NULL;
123 found:
124 read_unlock_bh(&atalk_sockets_lock);
125 return s;
126 }
127
128 /**
129 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
130 * @sk - socket to insert in the list if it is not there already
131 * @sat - address to search for
132 *
133 * Try to find a socket matching ADDR in the socket list, if found then return
134 * it. If not, insert SK into the socket list.
135 *
136 * This entire operation must execute atomically.
137 */
138 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
139 struct sockaddr_at *sat)
140 {
141 struct sock *s;
142 struct hlist_node *node;
143 struct atalk_sock *at;
144
145 write_lock_bh(&atalk_sockets_lock);
146 sk_for_each(s, node, &atalk_sockets) {
147 at = at_sk(s);
148
149 if (at->src_net == sat->sat_addr.s_net &&
150 at->src_node == sat->sat_addr.s_node &&
151 at->src_port == sat->sat_port)
152 goto found;
153 }
154 s = NULL;
155 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
156 found:
157 write_unlock_bh(&atalk_sockets_lock);
158 return s;
159 }
160
161 static void atalk_destroy_timer(unsigned long data)
162 {
163 struct sock *sk = (struct sock *)data;
164
165 if (atomic_read(&sk->sk_wmem_alloc) ||
166 atomic_read(&sk->sk_rmem_alloc)) {
167 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
168 add_timer(&sk->sk_timer);
169 } else
170 sock_put(sk);
171 }
172
173 static inline void atalk_destroy_socket(struct sock *sk)
174 {
175 atalk_remove_socket(sk);
176 skb_queue_purge(&sk->sk_receive_queue);
177
178 if (atomic_read(&sk->sk_wmem_alloc) ||
179 atomic_read(&sk->sk_rmem_alloc)) {
180 init_timer(&sk->sk_timer);
181 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
182 sk->sk_timer.function = atalk_destroy_timer;
183 sk->sk_timer.data = (unsigned long)sk;
184 add_timer(&sk->sk_timer);
185 } else
186 sock_put(sk);
187 }
188
189 /**************************************************************************\
190 * *
191 * Routing tables for the AppleTalk socket layer. *
192 * *
193 \**************************************************************************/
194
195 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
196 struct atalk_route *atalk_routes;
197 DEFINE_RWLOCK(atalk_routes_lock);
198
199 struct atalk_iface *atalk_interfaces;
200 DEFINE_RWLOCK(atalk_interfaces_lock);
201
202 /* For probing devices or in a routerless network */
203 struct atalk_route atrtr_default;
204
205 /* AppleTalk interface control */
206 /*
207 * Drop a device. Doesn't drop any of its routes - that is the caller's
208 * problem. Called when we down the interface or delete the address.
209 */
210 static void atif_drop_device(struct net_device *dev)
211 {
212 struct atalk_iface **iface = &atalk_interfaces;
213 struct atalk_iface *tmp;
214
215 write_lock_bh(&atalk_interfaces_lock);
216 while ((tmp = *iface) != NULL) {
217 if (tmp->dev == dev) {
218 *iface = tmp->next;
219 dev_put(dev);
220 kfree(tmp);
221 dev->atalk_ptr = NULL;
222 } else
223 iface = &tmp->next;
224 }
225 write_unlock_bh(&atalk_interfaces_lock);
226 }
227
228 static struct atalk_iface *atif_add_device(struct net_device *dev,
229 struct atalk_addr *sa)
230 {
231 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
232
233 if (!iface)
234 goto out;
235
236 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);
246 out:
247 return iface;
248 }
249
250 /* Perform phase 2 AARP probing on our tentative address */
251 static 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 */
298 static 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;
317
318 /* 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
343 struct 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
349 static 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;
375 out:
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 */
384 static 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;
395 out:
396 return iface;
397 out_err:
398 iface = NULL;
399 goto out;
400 }
401
402 /* Find a match for a specific network:node pair */
403 static struct atalk_iface *atalk_find_interface(__be16 net, int node)
404 {
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))
420 break;
421 }
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 */
432 static struct atalk_route *atrtr_find(struct atalk_addr *target)
433 {
434 /*
435 * we must search through all routes unless we find a
436 * host route, because some host routes might overlap
437 * network routes
438 */
439 struct atalk_route *net_route = NULL;
440 struct atalk_route *r;
441
442 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 }
463
464 /*
465 * 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;
474 out:
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 */
484 struct 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 */
491 static 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 */
504 static 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) >=
543 ntohs(iface->nets.nr_firstnet) &&
544 ntohs(ga->sat_addr.s_net) <=
545 ntohs(iface->nets.nr_lastnet))
546 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;
551 }
552 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) {
562 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
563
564 retval = -ENOBUFS;
565 if (!rt)
566 goto out_unlock;
567
568 rt->next = atalk_routes;
569 atalk_routes = rt;
570 }
571
572 /* Fill in the routing entry */
573 rt->target = ta->sat_addr;
574 dev_hold(devhint);
575 rt->dev = devhint;
576 rt->flags = r->rt_flags;
577 rt->gateway = ga->sat_addr;
578
579 retval = 0;
580 out_unlock:
581 write_unlock_bh(&atalk_routes_lock);
582 out:
583 return retval;
584 }
585
586 /* Delete a route. Find it and discard it */
587 static 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;
606 out:
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 */
615 static 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 */
636 static 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 */
647 static int ddp_device_event(struct notifier_block *this, unsigned long event,
648 void *ptr)
649 {
650 if (event == NETDEV_DOWN)
651 /* Discard any use of this */
652 atalk_dev_down(ptr);
653
654 return NOTIFY_DONE;
655 }
656
657 /* ioctl calls. Shouldn't even need touching */
658 /* Device configuration ioctl calls */
659 static int atif_ioctl(int cmd, void __user *arg)
660 {
661 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
662 struct ifreq atreq;
663 struct atalk_netrange *nr;
664 struct sockaddr_at *sa;
665 struct net_device *dev;
666 struct atalk_iface *atif;
667 int ct;
668 int limit;
669 struct rtentry rtdef;
670 int add_route;
671
672 if (copy_from_user(&atreq, arg, sizeof(atreq)))
673 return -EFAULT;
674
675 dev = __dev_get_by_name(atreq.ifr_name);
676 if (!dev)
677 return -ENODEV;
678
679 sa = (struct sockaddr_at *)&atreq.ifr_addr;
680 atif = atalk_find_dev(dev);
681
682 switch (cmd) {
683 case SIOCSIFADDR:
684 if (!capable(CAP_NET_ADMIN))
685 return -EPERM;
686 if (sa->sat_family != AF_APPLETALK)
687 return -EINVAL;
688 if (dev->type != ARPHRD_ETHER &&
689 dev->type != ARPHRD_LOOPBACK &&
690 dev->type != ARPHRD_LOCALTLK &&
691 dev->type != ARPHRD_PPP)
692 return -EPROTONOSUPPORT;
693
694 nr = (struct atalk_netrange *)&sa->sat_zero[0];
695 add_route = 1;
696
697 /*
698 * if this is a point-to-point iface, and we already
699 * have an iface for this AppleTalk address, then we
700 * should not add a route
701 */
702 if ((dev->flags & IFF_POINTOPOINT) &&
703 atalk_find_interface(sa->sat_addr.s_net,
704 sa->sat_addr.s_node)) {
705 printk(KERN_DEBUG "AppleTalk: point-to-point "
706 "interface added with "
707 "existing address\n");
708 add_route = 0;
709 }
710
711 /*
712 * Phase 1 is fine on LocalTalk but we don't do
713 * EtherTalk phase 1. Anyone wanting to add it go ahead.
714 */
715 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
716 return -EPROTONOSUPPORT;
717 if (sa->sat_addr.s_node == ATADDR_BCAST ||
718 sa->sat_addr.s_node == 254)
719 return -EINVAL;
720 if (atif) {
721 /* Already setting address */
722 if (atif->status & ATIF_PROBE)
723 return -EBUSY;
724
725 atif->address.s_net = sa->sat_addr.s_net;
726 atif->address.s_node = sa->sat_addr.s_node;
727 atrtr_device_down(dev); /* Flush old routes */
728 } else {
729 atif = atif_add_device(dev, &sa->sat_addr);
730 if (!atif)
731 return -ENOMEM;
732 }
733 atif->nets = *nr;
734
735 /*
736 * Check if the chosen address is used. If so we
737 * error and atalkd will try another.
738 */
739
740 if (!(dev->flags & IFF_LOOPBACK) &&
741 !(dev->flags & IFF_POINTOPOINT) &&
742 atif_probe_device(atif) < 0) {
743 atif_drop_device(dev);
744 return -EADDRINUSE;
745 }
746
747 /* Hey it worked - add the direct routes */
748 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
749 sa->sat_family = AF_APPLETALK;
750 sa->sat_addr.s_net = atif->address.s_net;
751 sa->sat_addr.s_node = atif->address.s_node;
752 sa = (struct sockaddr_at *)&rtdef.rt_dst;
753 rtdef.rt_flags = RTF_UP;
754 sa->sat_family = AF_APPLETALK;
755 sa->sat_addr.s_node = ATADDR_ANYNODE;
756 if (dev->flags & IFF_LOOPBACK ||
757 dev->flags & IFF_POINTOPOINT)
758 rtdef.rt_flags |= RTF_HOST;
759
760 /* Routerless initial state */
761 if (nr->nr_firstnet == htons(0) &&
762 nr->nr_lastnet == htons(0xFFFE)) {
763 sa->sat_addr.s_net = atif->address.s_net;
764 atrtr_create(&rtdef, dev);
765 atrtr_set_default(dev);
766 } else {
767 limit = ntohs(nr->nr_lastnet);
768 if (limit - ntohs(nr->nr_firstnet) > 4096) {
769 printk(KERN_WARNING "Too many routes/"
770 "iface.\n");
771 return -EINVAL;
772 }
773 if (add_route)
774 for (ct = ntohs(nr->nr_firstnet);
775 ct <= limit; ct++) {
776 sa->sat_addr.s_net = htons(ct);
777 atrtr_create(&rtdef, dev);
778 }
779 }
780 dev_mc_add(dev, aarp_mcast, 6, 1);
781 return 0;
782
783 case SIOCGIFADDR:
784 if (!atif)
785 return -EADDRNOTAVAIL;
786
787 sa->sat_family = AF_APPLETALK;
788 sa->sat_addr = atif->address;
789 break;
790
791 case SIOCGIFBRDADDR:
792 if (!atif)
793 return -EADDRNOTAVAIL;
794
795 sa->sat_family = AF_APPLETALK;
796 sa->sat_addr.s_net = atif->address.s_net;
797 sa->sat_addr.s_node = ATADDR_BCAST;
798 break;
799
800 case SIOCATALKDIFADDR:
801 case SIOCDIFADDR:
802 if (!capable(CAP_NET_ADMIN))
803 return -EPERM;
804 if (sa->sat_family != AF_APPLETALK)
805 return -EINVAL;
806 atalk_dev_down(dev);
807 break;
808
809 case SIOCSARP:
810 if (!capable(CAP_NET_ADMIN))
811 return -EPERM;
812 if (sa->sat_family != AF_APPLETALK)
813 return -EINVAL;
814 if (!atif)
815 return -EADDRNOTAVAIL;
816
817 /*
818 * for now, we only support proxy AARP on ELAP;
819 * we should be able to do it for LocalTalk, too.
820 */
821 if (dev->type != ARPHRD_ETHER)
822 return -EPROTONOSUPPORT;
823
824 /*
825 * atif points to the current interface on this network;
826 * we aren't concerned about its current status (at
827 * least for now), but it has all the settings about
828 * the network we're going to probe. Consequently, it
829 * must exist.
830 */
831 if (!atif)
832 return -EADDRNOTAVAIL;
833
834 nr = (struct atalk_netrange *)&(atif->nets);
835 /*
836 * Phase 1 is fine on Localtalk but we don't do
837 * Ethertalk phase 1. Anyone wanting to add it go ahead.
838 */
839 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
840 return -EPROTONOSUPPORT;
841
842 if (sa->sat_addr.s_node == ATADDR_BCAST ||
843 sa->sat_addr.s_node == 254)
844 return -EINVAL;
845
846 /*
847 * Check if the chosen address is used. If so we
848 * error and ATCP will try another.
849 */
850 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
851 return -EADDRINUSE;
852
853 /*
854 * We now have an address on the local network, and
855 * the AARP code will defend it for us until we take it
856 * down. We don't set up any routes right now, because
857 * ATCP will install them manually via SIOCADDRT.
858 */
859 break;
860
861 case SIOCDARP:
862 if (!capable(CAP_NET_ADMIN))
863 return -EPERM;
864 if (sa->sat_family != AF_APPLETALK)
865 return -EINVAL;
866 if (!atif)
867 return -EADDRNOTAVAIL;
868
869 /* give to aarp module to remove proxy entry */
870 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
871 return 0;
872 }
873
874 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
875 }
876
877 /* Routing ioctl() calls */
878 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
879 {
880 struct rtentry rt;
881
882 if (copy_from_user(&rt, arg, sizeof(rt)))
883 return -EFAULT;
884
885 switch (cmd) {
886 case SIOCDELRT:
887 if (rt.rt_dst.sa_family != AF_APPLETALK)
888 return -EINVAL;
889 return atrtr_delete(&((struct sockaddr_at *)
890 &rt.rt_dst)->sat_addr);
891
892 case SIOCADDRT: {
893 struct net_device *dev = NULL;
894 if (rt.rt_dev) {
895 char name[IFNAMSIZ];
896 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
897 return -EFAULT;
898 name[IFNAMSIZ-1] = '\0';
899 dev = __dev_get_by_name(name);
900 if (!dev)
901 return -ENODEV;
902 }
903 return atrtr_create(&rt, dev);
904 }
905 }
906 return -EINVAL;
907 }
908
909 /**************************************************************************\
910 * *
911 * Handling for system calls applied via the various interfaces to an *
912 * AppleTalk socket object. *
913 * *
914 \**************************************************************************/
915
916 /*
917 * Checksum: This is 'optional'. It's quite likely also a good
918 * candidate for assembler hackery 8)
919 */
920 static unsigned long atalk_sum_partial(const unsigned char *data,
921 int len, unsigned long sum)
922 {
923 /* This ought to be unwrapped neatly. I'll trust gcc for now */
924 while (len--) {
925 sum += *data;
926 sum <<= 1;
927 if (sum & 0x10000) {
928 sum++;
929 sum &= 0xffff;
930 }
931 data++;
932 }
933 return sum;
934 }
935
936 /* Checksum skb data -- similar to skb_checksum */
937 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
938 int len, unsigned long sum)
939 {
940 int start = skb_headlen(skb);
941 int i, copy;
942
943 /* checksum stuff in header space */
944 if ( (copy = start - offset) > 0) {
945 if (copy > len)
946 copy = len;
947 sum = atalk_sum_partial(skb->data + offset, copy, sum);
948 if ( (len -= copy) == 0)
949 return sum;
950
951 offset += copy;
952 }
953
954 /* checksum stuff in frags */
955 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
956 int end;
957
958 BUG_TRAP(start <= offset + len);
959
960 end = start + skb_shinfo(skb)->frags[i].size;
961 if ((copy = end - offset) > 0) {
962 u8 *vaddr;
963 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
964
965 if (copy > len)
966 copy = len;
967 vaddr = kmap_skb_frag(frag);
968 sum = atalk_sum_partial(vaddr + frag->page_offset +
969 offset - start, copy, sum);
970 kunmap_skb_frag(vaddr);
971
972 if (!(len -= copy))
973 return sum;
974 offset += copy;
975 }
976 start = end;
977 }
978
979 if (skb_shinfo(skb)->frag_list) {
980 struct sk_buff *list = skb_shinfo(skb)->frag_list;
981
982 for (; list; list = list->next) {
983 int end;
984
985 BUG_TRAP(start <= offset + len);
986
987 end = start + list->len;
988 if ((copy = end - offset) > 0) {
989 if (copy > len)
990 copy = len;
991 sum = atalk_sum_skb(list, offset - start,
992 copy, sum);
993 if ((len -= copy) == 0)
994 return sum;
995 offset += copy;
996 }
997 start = end;
998 }
999 }
1000
1001 BUG_ON(len > 0);
1002
1003 return sum;
1004 }
1005
1006 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1007 {
1008 unsigned long sum;
1009
1010 /* skip header 4 bytes */
1011 sum = atalk_sum_skb(skb, 4, len-4, 0);
1012
1013 /* Use 0xFFFF for 0. 0 itself means none */
1014 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1015 }
1016
1017 static struct proto ddp_proto = {
1018 .name = "DDP",
1019 .owner = THIS_MODULE,
1020 .obj_size = sizeof(struct atalk_sock),
1021 };
1022
1023 /*
1024 * Create a socket. Initialise the socket, blank the addresses
1025 * set the state.
1026 */
1027 static int atalk_create(struct socket *sock, int protocol)
1028 {
1029 struct sock *sk;
1030 int rc = -ESOCKTNOSUPPORT;
1031
1032 /*
1033 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1034 * and gives you the full ELAP frame. Should be handy for CAP 8)
1035 */
1036 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1037 goto out;
1038 rc = -ENOMEM;
1039 sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1);
1040 if (!sk)
1041 goto out;
1042 rc = 0;
1043 sock->ops = &atalk_dgram_ops;
1044 sock_init_data(sock, sk);
1045
1046 /* Checksums on by default */
1047 sock_set_flag(sk, SOCK_ZAPPED);
1048 out:
1049 return rc;
1050 }
1051
1052 /* Free a socket. No work needed */
1053 static int atalk_release(struct socket *sock)
1054 {
1055 struct sock *sk = sock->sk;
1056
1057 if (sk) {
1058 sock_orphan(sk);
1059 sock->sk = NULL;
1060 atalk_destroy_socket(sk);
1061 }
1062 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 */
1075 static 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
1102 try_next_port:;
1103 }
1104
1105 retval = -EBUSY;
1106 out:
1107 write_unlock_bh(&atalk_sockets_lock);
1108 return retval;
1109 }
1110
1111 static 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);
1127 out:
1128 return n;
1129 }
1130
1131 /* Set the address 'our end' of the connection */
1132 static 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);
1137
1138 if (!sock_flag(sk, SOCK_ZAPPED) ||
1139 addr_len != sizeof(struct sockaddr_at))
1140 return -EINVAL;
1141
1142 if (addr->sat_family != AF_APPLETALK)
1143 return -EAFNOSUPPORT;
1144
1145 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1146 struct atalk_addr *ap = atalk_find_primary();
1147
1148 if (!ap)
1149 return -EADDRNOTAVAIL;
1150
1151 at->src_net = addr->sat_addr.s_net = ap->s_net;
1152 at->src_node = addr->sat_addr.s_node= ap->s_node;
1153 } else {
1154 if (!atalk_find_interface(addr->sat_addr.s_net,
1155 addr->sat_addr.s_node))
1156 return -EADDRNOTAVAIL;
1157
1158 at->src_net = addr->sat_addr.s_net;
1159 at->src_node = addr->sat_addr.s_node;
1160 }
1161
1162 if (addr->sat_port == ATADDR_ANYPORT) {
1163 int n = atalk_pick_and_bind_port(sk, addr);
1164
1165 if (n < 0)
1166 return n;
1167 } else {
1168 at->src_port = addr->sat_port;
1169
1170 if (atalk_find_or_insert_socket(sk, addr))
1171 return -EADDRINUSE;
1172 }
1173
1174 sock_reset_flag(sk, SOCK_ZAPPED);
1175 return 0;
1176 }
1177
1178 /* Set the address we talk to */
1179 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1180 int addr_len, int flags)
1181 {
1182 struct sock *sk = sock->sk;
1183 struct atalk_sock *at = at_sk(sk);
1184 struct sockaddr_at *addr;
1185
1186 sk->sk_state = TCP_CLOSE;
1187 sock->state = SS_UNCONNECTED;
1188
1189 if (addr_len != sizeof(*addr))
1190 return -EINVAL;
1191
1192 addr = (struct sockaddr_at *)uaddr;
1193
1194 if (addr->sat_family != AF_APPLETALK)
1195 return -EAFNOSUPPORT;
1196
1197 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1198 !sock_flag(sk, SOCK_BROADCAST)) {
1199 #if 1
1200 printk(KERN_WARNING "%s is broken and did not set "
1201 "SO_BROADCAST. It will break when 2.2 is "
1202 "released.\n",
1203 current->comm);
1204 #else
1205 return -EACCES;
1206 #endif
1207 }
1208
1209 if (sock_flag(sk, SOCK_ZAPPED))
1210 if (atalk_autobind(sk) < 0)
1211 return -EBUSY;
1212
1213 if (!atrtr_get_dev(&addr->sat_addr))
1214 return -ENETUNREACH;
1215
1216 at->dest_port = addr->sat_port;
1217 at->dest_net = addr->sat_addr.s_net;
1218 at->dest_node = addr->sat_addr.s_node;
1219
1220 sock->state = SS_CONNECTED;
1221 sk->sk_state = TCP_ESTABLISHED;
1222 return 0;
1223 }
1224
1225 /*
1226 * Find the name of an AppleTalk socket. Just copy the right
1227 * fields into the sockaddr.
1228 */
1229 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1230 int *uaddr_len, int peer)
1231 {
1232 struct sockaddr_at sat;
1233 struct sock *sk = sock->sk;
1234 struct atalk_sock *at = at_sk(sk);
1235
1236 if (sock_flag(sk, SOCK_ZAPPED))
1237 if (atalk_autobind(sk) < 0)
1238 return -ENOBUFS;
1239
1240 *uaddr_len = sizeof(struct sockaddr_at);
1241
1242 if (peer) {
1243 if (sk->sk_state != TCP_ESTABLISHED)
1244 return -ENOTCONN;
1245
1246 sat.sat_addr.s_net = at->dest_net;
1247 sat.sat_addr.s_node = at->dest_node;
1248 sat.sat_port = at->dest_port;
1249 } else {
1250 sat.sat_addr.s_net = at->src_net;
1251 sat.sat_addr.s_node = at->src_node;
1252 sat.sat_port = at->src_port;
1253 }
1254
1255 sat.sat_family = AF_APPLETALK;
1256 memcpy(uaddr, &sat, sizeof(sat));
1257 return 0;
1258 }
1259
1260 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1261 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1262 {
1263 return skb->data[12] == 22;
1264 }
1265
1266 static int handle_ip_over_ddp(struct sk_buff *skb)
1267 {
1268 struct net_device *dev = __dev_get_by_name("ipddp0");
1269 struct net_device_stats *stats;
1270
1271 /* This needs to be able to handle ipddp"N" devices */
1272 if (!dev)
1273 return -ENODEV;
1274
1275 skb->protocol = htons(ETH_P_IP);
1276 skb_pull(skb, 13);
1277 skb->dev = dev;
1278 skb->h.raw = skb->data;
1279
1280 stats = dev->priv;
1281 stats->rx_packets++;
1282 stats->rx_bytes += skb->len + 13;
1283 netif_rx(skb); /* Send the SKB up to a higher place. */
1284 return 0;
1285 }
1286 #else
1287 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1288 #define is_ip_over_ddp(skb) 0
1289 #define handle_ip_over_ddp(skb) 0
1290 #endif
1291
1292 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1293 struct ddpehdr *ddp, __u16 len_hops,
1294 int origlen)
1295 {
1296 struct atalk_route *rt;
1297 struct atalk_addr ta;
1298
1299 /*
1300 * Don't route multicast, etc., packets, or packets sent to "this
1301 * network"
1302 */
1303 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1304 /*
1305 * FIXME:
1306 *
1307 * Can it ever happen that a packet is from a PPP iface and
1308 * needs to be broadcast onto the default network?
1309 */
1310 if (dev->type == ARPHRD_PPP)
1311 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1312 "packet received from PPP iface\n");
1313 goto free_it;
1314 }
1315
1316 ta.s_net = ddp->deh_dnet;
1317 ta.s_node = ddp->deh_dnode;
1318
1319 /* Route the packet */
1320 rt = atrtr_find(&ta);
1321 /* increment hops count */
1322 len_hops += 1 << 10;
1323 if (!rt || !(len_hops & (15 << 10)))
1324 goto free_it;
1325
1326 /* FIXME: use skb->cb to be able to use shared skbs */
1327
1328 /*
1329 * Route goes through another gateway, so set the target to the
1330 * gateway instead.
1331 */
1332
1333 if (rt->flags & RTF_GATEWAY) {
1334 ta.s_net = rt->gateway.s_net;
1335 ta.s_node = rt->gateway.s_node;
1336 }
1337
1338 /* Fix up skb->len field */
1339 skb_trim(skb, min_t(unsigned int, origlen,
1340 (rt->dev->hard_header_len +
1341 ddp_dl->header_length + (len_hops & 1023))));
1342
1343 /* FIXME: use skb->cb to be able to use shared skbs */
1344 ddp->deh_len_hops = htons(len_hops);
1345
1346 /*
1347 * Send the buffer onwards
1348 *
1349 * Now we must always be careful. If it's come from LocalTalk to
1350 * EtherTalk it might not fit
1351 *
1352 * Order matters here: If a packet has to be copied to make a new
1353 * headroom (rare hopefully) then it won't need unsharing.
1354 *
1355 * Note. ddp-> becomes invalid at the realloc.
1356 */
1357 if (skb_headroom(skb) < 22) {
1358 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1359 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1360 kfree_skb(skb);
1361 if (!nskb)
1362 goto out;
1363 skb = nskb;
1364 } else
1365 skb = skb_unshare(skb, GFP_ATOMIC);
1366
1367 /*
1368 * If the buffer didn't vanish into the lack of space bitbucket we can
1369 * send it.
1370 */
1371 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1372 goto free_it;
1373 out:
1374 return;
1375 free_it:
1376 kfree_skb(skb);
1377 }
1378
1379 /**
1380 * atalk_rcv - Receive a packet (in skb) from device dev
1381 * @skb - packet received
1382 * @dev - network device where the packet comes from
1383 * @pt - packet type
1384 *
1385 * Receive a packet (in skb) from device dev. This has come from the SNAP
1386 * decoder, and on entry skb->h.raw is the DDP header, skb->len is the DDP
1387 * header, skb->len is the DDP length. The physical headers have been
1388 * extracted. PPP should probably pass frames marked as for this layer.
1389 * [ie ARPHRD_ETHERTALK]
1390 */
1391 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1392 struct packet_type *pt, struct net_device *orig_dev)
1393 {
1394 struct ddpehdr *ddp;
1395 struct sock *sock;
1396 struct atalk_iface *atif;
1397 struct sockaddr_at tosat;
1398 int origlen;
1399 __u16 len_hops;
1400
1401 /* Don't mangle buffer if shared */
1402 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1403 goto out;
1404
1405 /* Size check and make sure header is contiguous */
1406 if (!pskb_may_pull(skb, sizeof(*ddp)))
1407 goto freeit;
1408
1409 ddp = ddp_hdr(skb);
1410
1411 len_hops = ntohs(ddp->deh_len_hops);
1412
1413 /* Trim buffer in case of stray trailing data */
1414 origlen = skb->len;
1415 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1416
1417 /*
1418 * Size check to see if ddp->deh_len was crap
1419 * (Otherwise we'll detonate most spectacularly
1420 * in the middle of recvmsg()).
1421 */
1422 if (skb->len < sizeof(*ddp))
1423 goto freeit;
1424
1425 /*
1426 * Any checksums. Note we don't do htons() on this == is assumed to be
1427 * valid for net byte orders all over the networking code...
1428 */
1429 if (ddp->deh_sum &&
1430 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1431 /* Not a valid AppleTalk frame - dustbin time */
1432 goto freeit;
1433
1434 /* Check the packet is aimed at us */
1435 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1436 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1437 else
1438 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1439
1440 if (!atif) {
1441 /* Not ours, so we route the packet via the correct
1442 * AppleTalk iface
1443 */
1444 atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1445 goto out;
1446 }
1447
1448 /* if IP over DDP is not selected this code will be optimized out */
1449 if (is_ip_over_ddp(skb))
1450 return handle_ip_over_ddp(skb);
1451 /*
1452 * Which socket - atalk_search_socket() looks for a *full match*
1453 * of the <net, node, port> tuple.
1454 */
1455 tosat.sat_addr.s_net = ddp->deh_dnet;
1456 tosat.sat_addr.s_node = ddp->deh_dnode;
1457 tosat.sat_port = ddp->deh_dport;
1458
1459 sock = atalk_search_socket(&tosat, atif);
1460 if (!sock) /* But not one of our sockets */
1461 goto freeit;
1462
1463 /* Queue packet (standard) */
1464 skb->sk = sock;
1465
1466 if (sock_queue_rcv_skb(sock, skb) < 0)
1467 goto freeit;
1468 out:
1469 return 0;
1470 freeit:
1471 kfree_skb(skb);
1472 goto out;
1473 }
1474
1475 /*
1476 * Receive a LocalTalk frame. We make some demands on the caller here.
1477 * Caller must provide enough headroom on the packet to pull the short
1478 * header and append a long one.
1479 */
1480 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1481 struct packet_type *pt, struct net_device *orig_dev)
1482 {
1483 /* Expand any short form frames */
1484 if (skb->mac.raw[2] == 1) {
1485 struct ddpehdr *ddp;
1486 /* Find our address */
1487 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1488
1489 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1490 goto freeit;
1491
1492 /* Don't mangle buffer if shared */
1493 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1494 return 0;
1495
1496 /*
1497 * The push leaves us with a ddephdr not an shdr, and
1498 * handily the port bytes in the right place preset.
1499 */
1500 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1501
1502 /* Now fill in the long header */
1503
1504 /*
1505 * These two first. The mac overlays the new source/dest
1506 * network information so we MUST copy these before
1507 * we write the network numbers !
1508 */
1509
1510 ddp->deh_dnode = skb->mac.raw[0]; /* From physical header */
1511 ddp->deh_snode = skb->mac.raw[1]; /* From physical header */
1512
1513 ddp->deh_dnet = ap->s_net; /* Network number */
1514 ddp->deh_snet = ap->s_net;
1515 ddp->deh_sum = 0; /* No checksum */
1516 /*
1517 * Not sure about this bit...
1518 */
1519 /* Non routable, so force a drop if we slip up later */
1520 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1521 }
1522 skb->h.raw = skb->data;
1523
1524 return atalk_rcv(skb, dev, pt, orig_dev);
1525 freeit:
1526 kfree_skb(skb);
1527 return 0;
1528 }
1529
1530 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1531 size_t len)
1532 {
1533 struct sock *sk = sock->sk;
1534 struct atalk_sock *at = at_sk(sk);
1535 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1536 int flags = msg->msg_flags;
1537 int loopback = 0;
1538 struct sockaddr_at local_satalk, gsat;
1539 struct sk_buff *skb;
1540 struct net_device *dev;
1541 struct ddpehdr *ddp;
1542 int size;
1543 struct atalk_route *rt;
1544 int err;
1545
1546 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1547 return -EINVAL;
1548
1549 if (len > DDP_MAXSZ)
1550 return -EMSGSIZE;
1551
1552 if (usat) {
1553 if (sock_flag(sk, SOCK_ZAPPED))
1554 if (atalk_autobind(sk) < 0)
1555 return -EBUSY;
1556
1557 if (msg->msg_namelen < sizeof(*usat) ||
1558 usat->sat_family != AF_APPLETALK)
1559 return -EINVAL;
1560
1561 /* netatalk doesn't implement this check */
1562 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1563 !sock_flag(sk, SOCK_BROADCAST)) {
1564 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1565 "it will break before 2.2\n");
1566 #if 0
1567 return -EPERM;
1568 #endif
1569 }
1570 } else {
1571 if (sk->sk_state != TCP_ESTABLISHED)
1572 return -ENOTCONN;
1573 usat = &local_satalk;
1574 usat->sat_family = AF_APPLETALK;
1575 usat->sat_port = at->dest_port;
1576 usat->sat_addr.s_node = at->dest_node;
1577 usat->sat_addr.s_net = at->dest_net;
1578 }
1579
1580 /* Build a packet */
1581 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1582
1583 /* For headers */
1584 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1585
1586 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1587 rt = atrtr_find(&usat->sat_addr);
1588 } else {
1589 struct atalk_addr at_hint;
1590
1591 at_hint.s_node = 0;
1592 at_hint.s_net = at->src_net;
1593
1594 rt = atrtr_find(&at_hint);
1595 }
1596 if (!rt)
1597 return -ENETUNREACH;
1598
1599 dev = rt->dev;
1600
1601 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1602 sk, size, dev->name);
1603
1604 size += dev->hard_header_len;
1605 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1606 if (!skb)
1607 return err;
1608
1609 skb->sk = sk;
1610 skb_reserve(skb, ddp_dl->header_length);
1611 skb_reserve(skb, dev->hard_header_len);
1612 skb->dev = dev;
1613
1614 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1615
1616 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1617 ddp->deh_len_hops = htons(len + sizeof(*ddp));
1618 ddp->deh_dnet = usat->sat_addr.s_net;
1619 ddp->deh_snet = at->src_net;
1620 ddp->deh_dnode = usat->sat_addr.s_node;
1621 ddp->deh_snode = at->src_node;
1622 ddp->deh_dport = usat->sat_port;
1623 ddp->deh_sport = at->src_port;
1624
1625 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1626
1627 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1628 if (err) {
1629 kfree_skb(skb);
1630 return -EFAULT;
1631 }
1632
1633 if (sk->sk_no_check == 1)
1634 ddp->deh_sum = 0;
1635 else
1636 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1637
1638 /*
1639 * Loopback broadcast packets to non gateway targets (ie routes
1640 * to group we are in)
1641 */
1642 if (ddp->deh_dnode == ATADDR_BCAST &&
1643 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1644 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1645
1646 if (skb2) {
1647 loopback = 1;
1648 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1649 if (aarp_send_ddp(dev, skb2,
1650 &usat->sat_addr, NULL) == -1)
1651 kfree_skb(skb2);
1652 /* else queued/sent above in the aarp queue */
1653 }
1654 }
1655
1656 if (dev->flags & IFF_LOOPBACK || loopback) {
1657 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1658 /* loop back */
1659 skb_orphan(skb);
1660 if (ddp->deh_dnode == ATADDR_BCAST) {
1661 struct atalk_addr at_lo;
1662
1663 at_lo.s_node = 0;
1664 at_lo.s_net = 0;
1665
1666 rt = atrtr_find(&at_lo);
1667 if (!rt) {
1668 kfree_skb(skb);
1669 return -ENETUNREACH;
1670 }
1671 dev = rt->dev;
1672 skb->dev = dev;
1673 }
1674 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1675 } else {
1676 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1677 if (rt->flags & RTF_GATEWAY) {
1678 gsat.sat_addr = rt->gateway;
1679 usat = &gsat;
1680 }
1681
1682 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1683 kfree_skb(skb);
1684 /* else queued/sent above in the aarp queue */
1685 }
1686 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1687
1688 return len;
1689 }
1690
1691 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1692 size_t size, int flags)
1693 {
1694 struct sock *sk = sock->sk;
1695 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1696 struct ddpehdr *ddp;
1697 int copied = 0;
1698 int offset = 0;
1699 int err = 0;
1700 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1701 flags & MSG_DONTWAIT, &err);
1702 if (!skb)
1703 return err;
1704
1705 /* FIXME: use skb->cb to be able to use shared skbs */
1706 ddp = ddp_hdr(skb);
1707 copied = ntohs(ddp->deh_len_hops) & 1023;
1708
1709 if (sk->sk_type != SOCK_RAW) {
1710 offset = sizeof(*ddp);
1711 copied -= offset;
1712 }
1713
1714 if (copied > size) {
1715 copied = size;
1716 msg->msg_flags |= MSG_TRUNC;
1717 }
1718 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1719
1720 if (!err) {
1721 if (sat) {
1722 sat->sat_family = AF_APPLETALK;
1723 sat->sat_port = ddp->deh_sport;
1724 sat->sat_addr.s_node = ddp->deh_snode;
1725 sat->sat_addr.s_net = ddp->deh_snet;
1726 }
1727 msg->msg_namelen = sizeof(*sat);
1728 }
1729
1730 skb_free_datagram(sk, skb); /* Free the datagram. */
1731 return err ? : copied;
1732 }
1733
1734
1735 /*
1736 * AppleTalk ioctl calls.
1737 */
1738 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1739 {
1740 int rc = -ENOIOCTLCMD;
1741 struct sock *sk = sock->sk;
1742 void __user *argp = (void __user *)arg;
1743
1744 switch (cmd) {
1745 /* Protocol layer */
1746 case TIOCOUTQ: {
1747 long amount = sk->sk_sndbuf -
1748 atomic_read(&sk->sk_wmem_alloc);
1749
1750 if (amount < 0)
1751 amount = 0;
1752 rc = put_user(amount, (int __user *)argp);
1753 break;
1754 }
1755 case TIOCINQ: {
1756 /*
1757 * These two are safe on a single CPU system as only
1758 * user tasks fiddle here
1759 */
1760 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1761 long amount = 0;
1762
1763 if (skb)
1764 amount = skb->len - sizeof(struct ddpehdr);
1765 rc = put_user(amount, (int __user *)argp);
1766 break;
1767 }
1768 case SIOCGSTAMP:
1769 rc = sock_get_timestamp(sk, argp);
1770 break;
1771 /* Routing */
1772 case SIOCADDRT:
1773 case SIOCDELRT:
1774 rc = -EPERM;
1775 if (capable(CAP_NET_ADMIN))
1776 rc = atrtr_ioctl(cmd, argp);
1777 break;
1778 /* Interface */
1779 case SIOCGIFADDR:
1780 case SIOCSIFADDR:
1781 case SIOCGIFBRDADDR:
1782 case SIOCATALKDIFADDR:
1783 case SIOCDIFADDR:
1784 case SIOCSARP: /* proxy AARP */
1785 case SIOCDARP: /* proxy AARP */
1786 rtnl_lock();
1787 rc = atif_ioctl(cmd, argp);
1788 rtnl_unlock();
1789 break;
1790 }
1791
1792 return rc;
1793 }
1794
1795
1796 #ifdef CONFIG_COMPAT
1797 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1798 {
1799 /*
1800 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And
1801 * SIOCATALKDIFADDR is handled by upper layer as well, so there is
1802 * nothing to do. Eventually SIOCATALKDIFADDR should be moved
1803 * here so there is no generic SIOCPROTOPRIVATE translation in the
1804 * system.
1805 */
1806 return -ENOIOCTLCMD;
1807 }
1808 #endif
1809
1810
1811 static struct net_proto_family atalk_family_ops = {
1812 .family = PF_APPLETALK,
1813 .create = atalk_create,
1814 .owner = THIS_MODULE,
1815 };
1816
1817 static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1818 .family = PF_APPLETALK,
1819 .owner = THIS_MODULE,
1820 .release = atalk_release,
1821 .bind = atalk_bind,
1822 .connect = atalk_connect,
1823 .socketpair = sock_no_socketpair,
1824 .accept = sock_no_accept,
1825 .getname = atalk_getname,
1826 .poll = datagram_poll,
1827 .ioctl = atalk_ioctl,
1828 #ifdef CONFIG_COMPAT
1829 .compat_ioctl = atalk_compat_ioctl,
1830 #endif
1831 .listen = sock_no_listen,
1832 .shutdown = sock_no_shutdown,
1833 .setsockopt = sock_no_setsockopt,
1834 .getsockopt = sock_no_getsockopt,
1835 .sendmsg = atalk_sendmsg,
1836 .recvmsg = atalk_recvmsg,
1837 .mmap = sock_no_mmap,
1838 .sendpage = sock_no_sendpage,
1839 };
1840
1841 #include <linux/smp_lock.h>
1842 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1843
1844 static struct notifier_block ddp_notifier = {
1845 .notifier_call = ddp_device_event,
1846 };
1847
1848 static struct packet_type ltalk_packet_type = {
1849 .type = __constant_htons(ETH_P_LOCALTALK),
1850 .func = ltalk_rcv,
1851 };
1852
1853 static struct packet_type ppptalk_packet_type = {
1854 .type = __constant_htons(ETH_P_PPPTALK),
1855 .func = atalk_rcv,
1856 };
1857
1858 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1859
1860 /* Export symbols for use by drivers when AppleTalk is a module */
1861 EXPORT_SYMBOL(aarp_send_ddp);
1862 EXPORT_SYMBOL(atrtr_get_dev);
1863 EXPORT_SYMBOL(atalk_find_dev_addr);
1864
1865 static char atalk_err_snap[] __initdata =
1866 KERN_CRIT "Unable to register DDP with SNAP.\n";
1867
1868 /* Called by proto.c on kernel start up */
1869 static int __init atalk_init(void)
1870 {
1871 int rc = proto_register(&ddp_proto, 0);
1872
1873 if (rc != 0)
1874 goto out;
1875
1876 (void)sock_register(&atalk_family_ops);
1877 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1878 if (!ddp_dl)
1879 printk(atalk_err_snap);
1880
1881 dev_add_pack(&ltalk_packet_type);
1882 dev_add_pack(&ppptalk_packet_type);
1883
1884 register_netdevice_notifier(&ddp_notifier);
1885 aarp_proto_init();
1886 atalk_proc_init();
1887 atalk_register_sysctl();
1888 out:
1889 return rc;
1890 }
1891 module_init(atalk_init);
1892
1893 /*
1894 * No explicit module reference count manipulation is needed in the
1895 * protocol. Socket layer sets module reference count for us
1896 * and interfaces reference counting is done
1897 * by the network device layer.
1898 *
1899 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1900 * sockets be closed from user space.
1901 */
1902 static void __exit atalk_exit(void)
1903 {
1904 #ifdef CONFIG_SYSCTL
1905 atalk_unregister_sysctl();
1906 #endif /* CONFIG_SYSCTL */
1907 atalk_proc_exit();
1908 aarp_cleanup_module(); /* General aarp clean-up. */
1909 unregister_netdevice_notifier(&ddp_notifier);
1910 dev_remove_pack(&ltalk_packet_type);
1911 dev_remove_pack(&ppptalk_packet_type);
1912 unregister_snap_client(ddp_dl);
1913 sock_unregister(PF_APPLETALK);
1914 proto_unregister(&ddp_proto);
1915 }
1916 module_exit(atalk_exit);
1917
1918 MODULE_LICENSE("GPL");
1919 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1920 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1921 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
linux v2.6.22.y-op