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[NET]: Clean up sk_buff walkers.
[deliverable/linux.git] / net / appletalk / ddp.c
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 end = skb_headlen(skb);
941 int i, copy;
942
943 /* checksum stuff in header space */
944 if ((copy = end - 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 BUG_TRAP(len >= 0);
957
958 end = offset + skb_shinfo(skb)->frags[i].size;
959 if ((copy = end - offset) > 0) {
960 u8 *vaddr;
961 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
962
963 if (copy > len)
964 copy = len;
965 vaddr = kmap_skb_frag(frag);
966 sum = atalk_sum_partial(vaddr + frag->page_offset,
967 copy, sum);
968 kunmap_skb_frag(vaddr);
969
970 if (!(len -= copy))
971 return sum;
972 offset += copy;
973 }
974 }
975
976 if (skb_shinfo(skb)->frag_list) {
977 struct sk_buff *list = skb_shinfo(skb)->frag_list;
978
979 for (; list; list = list->next) {
980 BUG_TRAP(len >= 0);
981
982 end = offset + list->len;
983 if ((copy = end - offset) > 0) {
984 if (copy > len)
985 copy = len;
986 sum = atalk_sum_skb(list, 0, copy, sum);
987 if ((len -= copy) == 0)
988 return sum;
989 offset += copy;
990 }
991 }
992 }
993
994 BUG_ON(len > 0);
995
996 return sum;
997 }
998
999 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1000 {
1001 unsigned long sum;
1002
1003 /* skip header 4 bytes */
1004 sum = atalk_sum_skb(skb, 4, len-4, 0);
1005
1006 /* Use 0xFFFF for 0. 0 itself means none */
1007 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1008 }
1009
1010 static struct proto ddp_proto = {
1011 .name = "DDP",
1012 .owner = THIS_MODULE,
1013 .obj_size = sizeof(struct atalk_sock),
1014 };
1015
1016 /*
1017 * Create a socket. Initialise the socket, blank the addresses
1018 * set the state.
1019 */
1020 static int atalk_create(struct socket *sock, int protocol)
1021 {
1022 struct sock *sk;
1023 int rc = -ESOCKTNOSUPPORT;
1024
1025 /*
1026 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1027 * and gives you the full ELAP frame. Should be handy for CAP 8)
1028 */
1029 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1030 goto out;
1031 rc = -ENOMEM;
1032 sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1);
1033 if (!sk)
1034 goto out;
1035 rc = 0;
1036 sock->ops = &atalk_dgram_ops;
1037 sock_init_data(sock, sk);
1038
1039 /* Checksums on by default */
1040 sock_set_flag(sk, SOCK_ZAPPED);
1041 out:
1042 return rc;
1043 }
1044
1045 /* Free a socket. No work needed */
1046 static int atalk_release(struct socket *sock)
1047 {
1048 struct sock *sk = sock->sk;
1049
1050 if (sk) {
1051 sock_orphan(sk);
1052 sock->sk = NULL;
1053 atalk_destroy_socket(sk);
1054 }
1055 return 0;
1056 }
1057
1058 /**
1059 * atalk_pick_and_bind_port - Pick a source port when one is not given
1060 * @sk - socket to insert into the tables
1061 * @sat - address to search for
1062 *
1063 * Pick a source port when one is not given. If we can find a suitable free
1064 * one, we insert the socket into the tables using it.
1065 *
1066 * This whole operation must be atomic.
1067 */
1068 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1069 {
1070 int retval;
1071
1072 write_lock_bh(&atalk_sockets_lock);
1073
1074 for (sat->sat_port = ATPORT_RESERVED;
1075 sat->sat_port < ATPORT_LAST;
1076 sat->sat_port++) {
1077 struct sock *s;
1078 struct hlist_node *node;
1079
1080 sk_for_each(s, node, &atalk_sockets) {
1081 struct atalk_sock *at = at_sk(s);
1082
1083 if (at->src_net == sat->sat_addr.s_net &&
1084 at->src_node == sat->sat_addr.s_node &&
1085 at->src_port == sat->sat_port)
1086 goto try_next_port;
1087 }
1088
1089 /* Wheee, it's free, assign and insert. */
1090 __atalk_insert_socket(sk);
1091 at_sk(sk)->src_port = sat->sat_port;
1092 retval = 0;
1093 goto out;
1094
1095 try_next_port:;
1096 }
1097
1098 retval = -EBUSY;
1099 out:
1100 write_unlock_bh(&atalk_sockets_lock);
1101 return retval;
1102 }
1103
1104 static int atalk_autobind(struct sock *sk)
1105 {
1106 struct atalk_sock *at = at_sk(sk);
1107 struct sockaddr_at sat;
1108 struct atalk_addr *ap = atalk_find_primary();
1109 int n = -EADDRNOTAVAIL;
1110
1111 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1112 goto out;
1113
1114 at->src_net = sat.sat_addr.s_net = ap->s_net;
1115 at->src_node = sat.sat_addr.s_node = ap->s_node;
1116
1117 n = atalk_pick_and_bind_port(sk, &sat);
1118 if (!n)
1119 sock_reset_flag(sk, SOCK_ZAPPED);
1120 out:
1121 return n;
1122 }
1123
1124 /* Set the address 'our end' of the connection */
1125 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1126 {
1127 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1128 struct sock *sk = sock->sk;
1129 struct atalk_sock *at = at_sk(sk);
1130
1131 if (!sock_flag(sk, SOCK_ZAPPED) ||
1132 addr_len != sizeof(struct sockaddr_at))
1133 return -EINVAL;
1134
1135 if (addr->sat_family != AF_APPLETALK)
1136 return -EAFNOSUPPORT;
1137
1138 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1139 struct atalk_addr *ap = atalk_find_primary();
1140
1141 if (!ap)
1142 return -EADDRNOTAVAIL;
1143
1144 at->src_net = addr->sat_addr.s_net = ap->s_net;
1145 at->src_node = addr->sat_addr.s_node= ap->s_node;
1146 } else {
1147 if (!atalk_find_interface(addr->sat_addr.s_net,
1148 addr->sat_addr.s_node))
1149 return -EADDRNOTAVAIL;
1150
1151 at->src_net = addr->sat_addr.s_net;
1152 at->src_node = addr->sat_addr.s_node;
1153 }
1154
1155 if (addr->sat_port == ATADDR_ANYPORT) {
1156 int n = atalk_pick_and_bind_port(sk, addr);
1157
1158 if (n < 0)
1159 return n;
1160 } else {
1161 at->src_port = addr->sat_port;
1162
1163 if (atalk_find_or_insert_socket(sk, addr))
1164 return -EADDRINUSE;
1165 }
1166
1167 sock_reset_flag(sk, SOCK_ZAPPED);
1168 return 0;
1169 }
1170
1171 /* Set the address we talk to */
1172 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1173 int addr_len, int flags)
1174 {
1175 struct sock *sk = sock->sk;
1176 struct atalk_sock *at = at_sk(sk);
1177 struct sockaddr_at *addr;
1178
1179 sk->sk_state = TCP_CLOSE;
1180 sock->state = SS_UNCONNECTED;
1181
1182 if (addr_len != sizeof(*addr))
1183 return -EINVAL;
1184
1185 addr = (struct sockaddr_at *)uaddr;
1186
1187 if (addr->sat_family != AF_APPLETALK)
1188 return -EAFNOSUPPORT;
1189
1190 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1191 !sock_flag(sk, SOCK_BROADCAST)) {
1192 #if 1
1193 printk(KERN_WARNING "%s is broken and did not set "
1194 "SO_BROADCAST. It will break when 2.2 is "
1195 "released.\n",
1196 current->comm);
1197 #else
1198 return -EACCES;
1199 #endif
1200 }
1201
1202 if (sock_flag(sk, SOCK_ZAPPED))
1203 if (atalk_autobind(sk) < 0)
1204 return -EBUSY;
1205
1206 if (!atrtr_get_dev(&addr->sat_addr))
1207 return -ENETUNREACH;
1208
1209 at->dest_port = addr->sat_port;
1210 at->dest_net = addr->sat_addr.s_net;
1211 at->dest_node = addr->sat_addr.s_node;
1212
1213 sock->state = SS_CONNECTED;
1214 sk->sk_state = TCP_ESTABLISHED;
1215 return 0;
1216 }
1217
1218 /*
1219 * Find the name of an AppleTalk socket. Just copy the right
1220 * fields into the sockaddr.
1221 */
1222 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1223 int *uaddr_len, int peer)
1224 {
1225 struct sockaddr_at sat;
1226 struct sock *sk = sock->sk;
1227 struct atalk_sock *at = at_sk(sk);
1228
1229 if (sock_flag(sk, SOCK_ZAPPED))
1230 if (atalk_autobind(sk) < 0)
1231 return -ENOBUFS;
1232
1233 *uaddr_len = sizeof(struct sockaddr_at);
1234
1235 if (peer) {
1236 if (sk->sk_state != TCP_ESTABLISHED)
1237 return -ENOTCONN;
1238
1239 sat.sat_addr.s_net = at->dest_net;
1240 sat.sat_addr.s_node = at->dest_node;
1241 sat.sat_port = at->dest_port;
1242 } else {
1243 sat.sat_addr.s_net = at->src_net;
1244 sat.sat_addr.s_node = at->src_node;
1245 sat.sat_port = at->src_port;
1246 }
1247
1248 sat.sat_family = AF_APPLETALK;
1249 memcpy(uaddr, &sat, sizeof(sat));
1250 return 0;
1251 }
1252
1253 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1254 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1255 {
1256 return skb->data[12] == 22;
1257 }
1258
1259 static int handle_ip_over_ddp(struct sk_buff *skb)
1260 {
1261 struct net_device *dev = __dev_get_by_name("ipddp0");
1262 struct net_device_stats *stats;
1263
1264 /* This needs to be able to handle ipddp"N" devices */
1265 if (!dev)
1266 return -ENODEV;
1267
1268 skb->protocol = htons(ETH_P_IP);
1269 skb_pull(skb, 13);
1270 skb->dev = dev;
1271 skb_reset_transport_header(skb);
1272
1273 stats = dev->priv;
1274 stats->rx_packets++;
1275 stats->rx_bytes += skb->len + 13;
1276 netif_rx(skb); /* Send the SKB up to a higher place. */
1277 return 0;
1278 }
1279 #else
1280 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1281 #define is_ip_over_ddp(skb) 0
1282 #define handle_ip_over_ddp(skb) 0
1283 #endif
1284
1285 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1286 struct ddpehdr *ddp, __u16 len_hops,
1287 int origlen)
1288 {
1289 struct atalk_route *rt;
1290 struct atalk_addr ta;
1291
1292 /*
1293 * Don't route multicast, etc., packets, or packets sent to "this
1294 * network"
1295 */
1296 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1297 /*
1298 * FIXME:
1299 *
1300 * Can it ever happen that a packet is from a PPP iface and
1301 * needs to be broadcast onto the default network?
1302 */
1303 if (dev->type == ARPHRD_PPP)
1304 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1305 "packet received from PPP iface\n");
1306 goto free_it;
1307 }
1308
1309 ta.s_net = ddp->deh_dnet;
1310 ta.s_node = ddp->deh_dnode;
1311
1312 /* Route the packet */
1313 rt = atrtr_find(&ta);
1314 /* increment hops count */
1315 len_hops += 1 << 10;
1316 if (!rt || !(len_hops & (15 << 10)))
1317 goto free_it;
1318
1319 /* FIXME: use skb->cb to be able to use shared skbs */
1320
1321 /*
1322 * Route goes through another gateway, so set the target to the
1323 * gateway instead.
1324 */
1325
1326 if (rt->flags & RTF_GATEWAY) {
1327 ta.s_net = rt->gateway.s_net;
1328 ta.s_node = rt->gateway.s_node;
1329 }
1330
1331 /* Fix up skb->len field */
1332 skb_trim(skb, min_t(unsigned int, origlen,
1333 (rt->dev->hard_header_len +
1334 ddp_dl->header_length + (len_hops & 1023))));
1335
1336 /* FIXME: use skb->cb to be able to use shared skbs */
1337 ddp->deh_len_hops = htons(len_hops);
1338
1339 /*
1340 * Send the buffer onwards
1341 *
1342 * Now we must always be careful. If it's come from LocalTalk to
1343 * EtherTalk it might not fit
1344 *
1345 * Order matters here: If a packet has to be copied to make a new
1346 * headroom (rare hopefully) then it won't need unsharing.
1347 *
1348 * Note. ddp-> becomes invalid at the realloc.
1349 */
1350 if (skb_headroom(skb) < 22) {
1351 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1352 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1353 kfree_skb(skb);
1354 if (!nskb)
1355 goto out;
1356 skb = nskb;
1357 } else
1358 skb = skb_unshare(skb, GFP_ATOMIC);
1359
1360 /*
1361 * If the buffer didn't vanish into the lack of space bitbucket we can
1362 * send it.
1363 */
1364 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1365 goto free_it;
1366 out:
1367 return;
1368 free_it:
1369 kfree_skb(skb);
1370 }
1371
1372 /**
1373 * atalk_rcv - Receive a packet (in skb) from device dev
1374 * @skb - packet received
1375 * @dev - network device where the packet comes from
1376 * @pt - packet type
1377 *
1378 * Receive a packet (in skb) from device dev. This has come from the SNAP
1379 * decoder, and on entry skb->transport_header is the DDP header, skb->len
1380 * is the DDP header, skb->len is the DDP length. The physical headers
1381 * have been extracted. PPP should probably pass frames marked as for this
1382 * layer. [ie ARPHRD_ETHERTALK]
1383 */
1384 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1385 struct packet_type *pt, struct net_device *orig_dev)
1386 {
1387 struct ddpehdr *ddp;
1388 struct sock *sock;
1389 struct atalk_iface *atif;
1390 struct sockaddr_at tosat;
1391 int origlen;
1392 __u16 len_hops;
1393
1394 /* Don't mangle buffer if shared */
1395 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1396 goto out;
1397
1398 /* Size check and make sure header is contiguous */
1399 if (!pskb_may_pull(skb, sizeof(*ddp)))
1400 goto freeit;
1401
1402 ddp = ddp_hdr(skb);
1403
1404 len_hops = ntohs(ddp->deh_len_hops);
1405
1406 /* Trim buffer in case of stray trailing data */
1407 origlen = skb->len;
1408 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1409
1410 /*
1411 * Size check to see if ddp->deh_len was crap
1412 * (Otherwise we'll detonate most spectacularly
1413 * in the middle of atalk_checksum() or recvmsg()).
1414 */
1415 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1416 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1417 "skb->len=%u)\n", len_hops & 1023, skb->len);
1418 goto freeit;
1419 }
1420
1421 /*
1422 * Any checksums. Note we don't do htons() on this == is assumed to be
1423 * valid for net byte orders all over the networking code...
1424 */
1425 if (ddp->deh_sum &&
1426 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1427 /* Not a valid AppleTalk frame - dustbin time */
1428 goto freeit;
1429
1430 /* Check the packet is aimed at us */
1431 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1432 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1433 else
1434 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1435
1436 if (!atif) {
1437 /* Not ours, so we route the packet via the correct
1438 * AppleTalk iface
1439 */
1440 atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1441 goto out;
1442 }
1443
1444 /* if IP over DDP is not selected this code will be optimized out */
1445 if (is_ip_over_ddp(skb))
1446 return handle_ip_over_ddp(skb);
1447 /*
1448 * Which socket - atalk_search_socket() looks for a *full match*
1449 * of the <net, node, port> tuple.
1450 */
1451 tosat.sat_addr.s_net = ddp->deh_dnet;
1452 tosat.sat_addr.s_node = ddp->deh_dnode;
1453 tosat.sat_port = ddp->deh_dport;
1454
1455 sock = atalk_search_socket(&tosat, atif);
1456 if (!sock) /* But not one of our sockets */
1457 goto freeit;
1458
1459 /* Queue packet (standard) */
1460 skb->sk = sock;
1461
1462 if (sock_queue_rcv_skb(sock, skb) < 0)
1463 goto freeit;
1464 out:
1465 return 0;
1466 freeit:
1467 kfree_skb(skb);
1468 goto out;
1469 }
1470
1471 /*
1472 * Receive a LocalTalk frame. We make some demands on the caller here.
1473 * Caller must provide enough headroom on the packet to pull the short
1474 * header and append a long one.
1475 */
1476 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1477 struct packet_type *pt, struct net_device *orig_dev)
1478 {
1479 /* Expand any short form frames */
1480 if (skb_mac_header(skb)[2] == 1) {
1481 struct ddpehdr *ddp;
1482 /* Find our address */
1483 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1484
1485 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1486 goto freeit;
1487
1488 /* Don't mangle buffer if shared */
1489 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1490 return 0;
1491
1492 /*
1493 * The push leaves us with a ddephdr not an shdr, and
1494 * handily the port bytes in the right place preset.
1495 */
1496 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1497
1498 /* Now fill in the long header */
1499
1500 /*
1501 * These two first. The mac overlays the new source/dest
1502 * network information so we MUST copy these before
1503 * we write the network numbers !
1504 */
1505
1506 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1507 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
1508
1509 ddp->deh_dnet = ap->s_net; /* Network number */
1510 ddp->deh_snet = ap->s_net;
1511 ddp->deh_sum = 0; /* No checksum */
1512 /*
1513 * Not sure about this bit...
1514 */
1515 /* Non routable, so force a drop if we slip up later */
1516 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1517 }
1518 skb_reset_transport_header(skb);
1519
1520 return atalk_rcv(skb, dev, pt, orig_dev);
1521 freeit:
1522 kfree_skb(skb);
1523 return 0;
1524 }
1525
1526 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1527 size_t len)
1528 {
1529 struct sock *sk = sock->sk;
1530 struct atalk_sock *at = at_sk(sk);
1531 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1532 int flags = msg->msg_flags;
1533 int loopback = 0;
1534 struct sockaddr_at local_satalk, gsat;
1535 struct sk_buff *skb;
1536 struct net_device *dev;
1537 struct ddpehdr *ddp;
1538 int size;
1539 struct atalk_route *rt;
1540 int err;
1541
1542 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1543 return -EINVAL;
1544
1545 if (len > DDP_MAXSZ)
1546 return -EMSGSIZE;
1547
1548 if (usat) {
1549 if (sock_flag(sk, SOCK_ZAPPED))
1550 if (atalk_autobind(sk) < 0)
1551 return -EBUSY;
1552
1553 if (msg->msg_namelen < sizeof(*usat) ||
1554 usat->sat_family != AF_APPLETALK)
1555 return -EINVAL;
1556
1557 /* netatalk doesn't implement this check */
1558 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1559 !sock_flag(sk, SOCK_BROADCAST)) {
1560 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1561 "it will break before 2.2\n");
1562 #if 0
1563 return -EPERM;
1564 #endif
1565 }
1566 } else {
1567 if (sk->sk_state != TCP_ESTABLISHED)
1568 return -ENOTCONN;
1569 usat = &local_satalk;
1570 usat->sat_family = AF_APPLETALK;
1571 usat->sat_port = at->dest_port;
1572 usat->sat_addr.s_node = at->dest_node;
1573 usat->sat_addr.s_net = at->dest_net;
1574 }
1575
1576 /* Build a packet */
1577 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1578
1579 /* For headers */
1580 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1581
1582 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1583 rt = atrtr_find(&usat->sat_addr);
1584 } else {
1585 struct atalk_addr at_hint;
1586
1587 at_hint.s_node = 0;
1588 at_hint.s_net = at->src_net;
1589
1590 rt = atrtr_find(&at_hint);
1591 }
1592 if (!rt)
1593 return -ENETUNREACH;
1594
1595 dev = rt->dev;
1596
1597 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1598 sk, size, dev->name);
1599
1600 size += dev->hard_header_len;
1601 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1602 if (!skb)
1603 return err;
1604
1605 skb->sk = sk;
1606 skb_reserve(skb, ddp_dl->header_length);
1607 skb_reserve(skb, dev->hard_header_len);
1608 skb->dev = dev;
1609
1610 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1611
1612 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1613 ddp->deh_len_hops = htons(len + sizeof(*ddp));
1614 ddp->deh_dnet = usat->sat_addr.s_net;
1615 ddp->deh_snet = at->src_net;
1616 ddp->deh_dnode = usat->sat_addr.s_node;
1617 ddp->deh_snode = at->src_node;
1618 ddp->deh_dport = usat->sat_port;
1619 ddp->deh_sport = at->src_port;
1620
1621 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1622
1623 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1624 if (err) {
1625 kfree_skb(skb);
1626 return -EFAULT;
1627 }
1628
1629 if (sk->sk_no_check == 1)
1630 ddp->deh_sum = 0;
1631 else
1632 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1633
1634 /*
1635 * Loopback broadcast packets to non gateway targets (ie routes
1636 * to group we are in)
1637 */
1638 if (ddp->deh_dnode == ATADDR_BCAST &&
1639 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1640 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1641
1642 if (skb2) {
1643 loopback = 1;
1644 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1645 if (aarp_send_ddp(dev, skb2,
1646 &usat->sat_addr, NULL) == -1)
1647 kfree_skb(skb2);
1648 /* else queued/sent above in the aarp queue */
1649 }
1650 }
1651
1652 if (dev->flags & IFF_LOOPBACK || loopback) {
1653 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1654 /* loop back */
1655 skb_orphan(skb);
1656 if (ddp->deh_dnode == ATADDR_BCAST) {
1657 struct atalk_addr at_lo;
1658
1659 at_lo.s_node = 0;
1660 at_lo.s_net = 0;
1661
1662 rt = atrtr_find(&at_lo);
1663 if (!rt) {
1664 kfree_skb(skb);
1665 return -ENETUNREACH;
1666 }
1667 dev = rt->dev;
1668 skb->dev = dev;
1669 }
1670 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1671 } else {
1672 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1673 if (rt->flags & RTF_GATEWAY) {
1674 gsat.sat_addr = rt->gateway;
1675 usat = &gsat;
1676 }
1677
1678 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1679 kfree_skb(skb);
1680 /* else queued/sent above in the aarp queue */
1681 }
1682 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1683
1684 return len;
1685 }
1686
1687 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1688 size_t size, int flags)
1689 {
1690 struct sock *sk = sock->sk;
1691 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1692 struct ddpehdr *ddp;
1693 int copied = 0;
1694 int offset = 0;
1695 int err = 0;
1696 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1697 flags & MSG_DONTWAIT, &err);
1698 if (!skb)
1699 return err;
1700
1701 /* FIXME: use skb->cb to be able to use shared skbs */
1702 ddp = ddp_hdr(skb);
1703 copied = ntohs(ddp->deh_len_hops) & 1023;
1704
1705 if (sk->sk_type != SOCK_RAW) {
1706 offset = sizeof(*ddp);
1707 copied -= offset;
1708 }
1709
1710 if (copied > size) {
1711 copied = size;
1712 msg->msg_flags |= MSG_TRUNC;
1713 }
1714 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1715
1716 if (!err) {
1717 if (sat) {
1718 sat->sat_family = AF_APPLETALK;
1719 sat->sat_port = ddp->deh_sport;
1720 sat->sat_addr.s_node = ddp->deh_snode;
1721 sat->sat_addr.s_net = ddp->deh_snet;
1722 }
1723 msg->msg_namelen = sizeof(*sat);
1724 }
1725
1726 skb_free_datagram(sk, skb); /* Free the datagram. */
1727 return err ? : copied;
1728 }
1729
1730
1731 /*
1732 * AppleTalk ioctl calls.
1733 */
1734 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1735 {
1736 int rc = -ENOIOCTLCMD;
1737 struct sock *sk = sock->sk;
1738 void __user *argp = (void __user *)arg;
1739
1740 switch (cmd) {
1741 /* Protocol layer */
1742 case TIOCOUTQ: {
1743 long amount = sk->sk_sndbuf -
1744 atomic_read(&sk->sk_wmem_alloc);
1745
1746 if (amount < 0)
1747 amount = 0;
1748 rc = put_user(amount, (int __user *)argp);
1749 break;
1750 }
1751 case TIOCINQ: {
1752 /*
1753 * These two are safe on a single CPU system as only
1754 * user tasks fiddle here
1755 */
1756 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1757 long amount = 0;
1758
1759 if (skb)
1760 amount = skb->len - sizeof(struct ddpehdr);
1761 rc = put_user(amount, (int __user *)argp);
1762 break;
1763 }
1764 case SIOCGSTAMP:
1765 rc = sock_get_timestamp(sk, argp);
1766 break;
1767 case SIOCGSTAMPNS:
1768 rc = sock_get_timestampns(sk, argp);
1769 break;
1770 /* Routing */
1771 case SIOCADDRT:
1772 case SIOCDELRT:
1773 rc = -EPERM;
1774 if (capable(CAP_NET_ADMIN))
1775 rc = atrtr_ioctl(cmd, argp);
1776 break;
1777 /* Interface */
1778 case SIOCGIFADDR:
1779 case SIOCSIFADDR:
1780 case SIOCGIFBRDADDR:
1781 case SIOCATALKDIFADDR:
1782 case SIOCDIFADDR:
1783 case SIOCSARP: /* proxy AARP */
1784 case SIOCDARP: /* proxy AARP */
1785 rtnl_lock();
1786 rc = atif_ioctl(cmd, argp);
1787 rtnl_unlock();
1788 break;
1789 }
1790
1791 return rc;
1792 }
1793
1794
1795 #ifdef CONFIG_COMPAT
1796 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1797 {
1798 /*
1799 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And
1800 * SIOCATALKDIFADDR is handled by upper layer as well, so there is
1801 * nothing to do. Eventually SIOCATALKDIFADDR should be moved
1802 * here so there is no generic SIOCPROTOPRIVATE translation in the
1803 * system.
1804 */
1805 return -ENOIOCTLCMD;
1806 }
1807 #endif
1808
1809
1810 static struct net_proto_family atalk_family_ops = {
1811 .family = PF_APPLETALK,
1812 .create = atalk_create,
1813 .owner = THIS_MODULE,
1814 };
1815
1816 static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1817 .family = PF_APPLETALK,
1818 .owner = THIS_MODULE,
1819 .release = atalk_release,
1820 .bind = atalk_bind,
1821 .connect = atalk_connect,
1822 .socketpair = sock_no_socketpair,
1823 .accept = sock_no_accept,
1824 .getname = atalk_getname,
1825 .poll = datagram_poll,
1826 .ioctl = atalk_ioctl,
1827 #ifdef CONFIG_COMPAT
1828 .compat_ioctl = atalk_compat_ioctl,
1829 #endif
1830 .listen = sock_no_listen,
1831 .shutdown = sock_no_shutdown,
1832 .setsockopt = sock_no_setsockopt,
1833 .getsockopt = sock_no_getsockopt,
1834 .sendmsg = atalk_sendmsg,
1835 .recvmsg = atalk_recvmsg,
1836 .mmap = sock_no_mmap,
1837 .sendpage = sock_no_sendpage,
1838 };
1839
1840 #include <linux/smp_lock.h>
1841 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1842
1843 static struct notifier_block ddp_notifier = {
1844 .notifier_call = ddp_device_event,
1845 };
1846
1847 static struct packet_type ltalk_packet_type = {
1848 .type = __constant_htons(ETH_P_LOCALTALK),
1849 .func = ltalk_rcv,
1850 };
1851
1852 static struct packet_type ppptalk_packet_type = {
1853 .type = __constant_htons(ETH_P_PPPTALK),
1854 .func = atalk_rcv,
1855 };
1856
1857 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1858
1859 /* Export symbols for use by drivers when AppleTalk is a module */
1860 EXPORT_SYMBOL(aarp_send_ddp);
1861 EXPORT_SYMBOL(atrtr_get_dev);
1862 EXPORT_SYMBOL(atalk_find_dev_addr);
1863
1864 static char atalk_err_snap[] __initdata =
1865 KERN_CRIT "Unable to register DDP with SNAP.\n";
1866
1867 /* Called by proto.c on kernel start up */
1868 static int __init atalk_init(void)
1869 {
1870 int rc = proto_register(&ddp_proto, 0);
1871
1872 if (rc != 0)
1873 goto out;
1874
1875 (void)sock_register(&atalk_family_ops);
1876 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1877 if (!ddp_dl)
1878 printk(atalk_err_snap);
1879
1880 dev_add_pack(&ltalk_packet_type);
1881 dev_add_pack(&ppptalk_packet_type);
1882
1883 register_netdevice_notifier(&ddp_notifier);
1884 aarp_proto_init();
1885 atalk_proc_init();
1886 atalk_register_sysctl();
1887 out:
1888 return rc;
1889 }
1890 module_init(atalk_init);
1891
1892 /*
1893 * No explicit module reference count manipulation is needed in the
1894 * protocol. Socket layer sets module reference count for us
1895 * and interfaces reference counting is done
1896 * by the network device layer.
1897 *
1898 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1899 * sockets be closed from user space.
1900 */
1901 static void __exit atalk_exit(void)
1902 {
1903 #ifdef CONFIG_SYSCTL
1904 atalk_unregister_sysctl();
1905 #endif /* CONFIG_SYSCTL */
1906 atalk_proc_exit();
1907 aarp_cleanup_module(); /* General aarp clean-up. */
1908 unregister_netdevice_notifier(&ddp_notifier);
1909 dev_remove_pack(&ltalk_packet_type);
1910 dev_remove_pack(&ppptalk_packet_type);
1911 unregister_snap_client(ddp_dl);
1912 sock_unregister(PF_APPLETALK);
1913 proto_unregister(&ddp_proto);
1914 }
1915 module_exit(atalk_exit);
1916
1917 MODULE_LICENSE("GPL");
1918 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1919 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1920 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
Linux kernel - Deliverables
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