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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / appletalk / ddp.c
blobc410b93fda2ecde367bf1815dda21ccbbff36823
1 /*
2 * DDP: An implementation of the AppleTalk DDP protocol for
3 * Ethernet 'ELAP'.
4 *
5 * Alan Cox <alan@lxorguk.ukuu.org.uk>
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/smp_lock.h>
58 #include <linux/termios.h> /* For TIOCOUTQ/INQ */
59 #include <linux/compat.h>
60 #include <linux/slab.h>
61 #include <net/datalink.h>
62 #include <net/psnap.h>
63 #include <net/sock.h>
64 #include <net/tcp_states.h>
65 #include <net/route.h>
66 #include <linux/atalk.h>
67 #include "../core/kmap_skb.h"
68
69 struct datalink_proto *ddp_dl, *aarp_dl;
70 static const struct proto_ops atalk_dgram_ops;
71
72 /**************************************************************************\
73 * *
74 * Handlers for the socket list. *
75 * *
76 \**************************************************************************/
77
78 HLIST_HEAD(atalk_sockets);
79 DEFINE_RWLOCK(atalk_sockets_lock);
80
81 static inline void __atalk_insert_socket(struct sock *sk)
82 {
83 sk_add_node(sk, &atalk_sockets);
84 }
85
86 static inline void atalk_remove_socket(struct sock *sk)
87 {
88 write_lock_bh(&atalk_sockets_lock);
89 sk_del_node_init(sk);
90 write_unlock_bh(&atalk_sockets_lock);
91 }
92
93 static struct sock *atalk_search_socket(struct sockaddr_at *to,
94 struct atalk_iface *atif)
95 {
96 struct sock *s;
97 struct hlist_node *node;
98
99 read_lock_bh(&atalk_sockets_lock);
100 sk_for_each(s, node, &atalk_sockets) {
101 struct atalk_sock *at = at_sk(s);
102
103 if (to->sat_port != at->src_port)
104 continue;
105
106 if (to->sat_addr.s_net == ATADDR_ANYNET &&
107 to->sat_addr.s_node == ATADDR_BCAST)
108 goto found;
109
110 if (to->sat_addr.s_net == at->src_net &&
111 (to->sat_addr.s_node == at->src_node ||
112 to->sat_addr.s_node == ATADDR_BCAST ||
113 to->sat_addr.s_node == ATADDR_ANYNODE))
114 goto found;
115
116 /* XXXX.0 -- we got a request for this router. make sure
117 * that the node is appropriately set. */
118 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
119 to->sat_addr.s_net != ATADDR_ANYNET &&
120 atif->address.s_node == at->src_node) {
121 to->sat_addr.s_node = atif->address.s_node;
122 goto found;
123 }
124 }
125 s = NULL;
126 found:
127 read_unlock_bh(&atalk_sockets_lock);
128 return s;
129 }
130
131 /**
132 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
133 * @sk - socket to insert in the list if it is not there already
134 * @sat - address to search for
135 *
136 * Try to find a socket matching ADDR in the socket list, if found then return
137 * it. If not, insert SK into the socket list.
138 *
139 * This entire operation must execute atomically.
140 */
141 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
142 struct sockaddr_at *sat)
143 {
144 struct sock *s;
145 struct hlist_node *node;
146 struct atalk_sock *at;
147
148 write_lock_bh(&atalk_sockets_lock);
149 sk_for_each(s, node, &atalk_sockets) {
150 at = at_sk(s);
151
152 if (at->src_net == sat->sat_addr.s_net &&
153 at->src_node == sat->sat_addr.s_node &&
154 at->src_port == sat->sat_port)
155 goto found;
156 }
157 s = NULL;
158 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
159 found:
160 write_unlock_bh(&atalk_sockets_lock);
161 return s;
162 }
163
164 static void atalk_destroy_timer(unsigned long data)
165 {
166 struct sock *sk = (struct sock *)data;
167
168 if (sk_has_allocations(sk)) {
169 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
170 add_timer(&sk->sk_timer);
171 } else
172 sock_put(sk);
173 }
174
175 static inline void atalk_destroy_socket(struct sock *sk)
176 {
177 atalk_remove_socket(sk);
178 skb_queue_purge(&sk->sk_receive_queue);
179
180 if (sk_has_allocations(sk)) {
181 setup_timer(&sk->sk_timer, atalk_destroy_timer,
182 (unsigned long)sk);
183 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
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 struct net_device *dev = ptr;
651
652 if (!net_eq(dev_net(dev), &init_net))
653 return NOTIFY_DONE;
654
655 if (event == NETDEV_DOWN)
656 /* Discard any use of this */
657 atalk_dev_down(dev);
658
659 return NOTIFY_DONE;
660 }
661
662 /* ioctl calls. Shouldn't even need touching */
663 /* Device configuration ioctl calls */
664 static int atif_ioctl(int cmd, void __user *arg)
665 {
666 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
667 struct ifreq atreq;
668 struct atalk_netrange *nr;
669 struct sockaddr_at *sa;
670 struct net_device *dev;
671 struct atalk_iface *atif;
672 int ct;
673 int limit;
674 struct rtentry rtdef;
675 int add_route;
676
677 if (copy_from_user(&atreq, arg, sizeof(atreq)))
678 return -EFAULT;
679
680 dev = __dev_get_by_name(&init_net, atreq.ifr_name);
681 if (!dev)
682 return -ENODEV;
683
684 sa = (struct sockaddr_at *)&atreq.ifr_addr;
685 atif = atalk_find_dev(dev);
686
687 switch (cmd) {
688 case SIOCSIFADDR:
689 if (!capable(CAP_NET_ADMIN))
690 return -EPERM;
691 if (sa->sat_family != AF_APPLETALK)
692 return -EINVAL;
693 if (dev->type != ARPHRD_ETHER &&
694 dev->type != ARPHRD_LOOPBACK &&
695 dev->type != ARPHRD_LOCALTLK &&
696 dev->type != ARPHRD_PPP)
697 return -EPROTONOSUPPORT;
698
699 nr = (struct atalk_netrange *)&sa->sat_zero[0];
700 add_route = 1;
701
702 /*
703 * if this is a point-to-point iface, and we already
704 * have an iface for this AppleTalk address, then we
705 * should not add a route
706 */
707 if ((dev->flags & IFF_POINTOPOINT) &&
708 atalk_find_interface(sa->sat_addr.s_net,
709 sa->sat_addr.s_node)) {
710 printk(KERN_DEBUG "AppleTalk: point-to-point "
711 "interface added with "
712 "existing address\n");
713 add_route = 0;
714 }
715
716 /*
717 * Phase 1 is fine on LocalTalk but we don't do
718 * EtherTalk phase 1. Anyone wanting to add it go ahead.
719 */
720 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
721 return -EPROTONOSUPPORT;
722 if (sa->sat_addr.s_node == ATADDR_BCAST ||
723 sa->sat_addr.s_node == 254)
724 return -EINVAL;
725 if (atif) {
726 /* Already setting address */
727 if (atif->status & ATIF_PROBE)
728 return -EBUSY;
729
730 atif->address.s_net = sa->sat_addr.s_net;
731 atif->address.s_node = sa->sat_addr.s_node;
732 atrtr_device_down(dev); /* Flush old routes */
733 } else {
734 atif = atif_add_device(dev, &sa->sat_addr);
735 if (!atif)
736 return -ENOMEM;
737 }
738 atif->nets = *nr;
739
740 /*
741 * Check if the chosen address is used. If so we
742 * error and atalkd will try another.
743 */
744
745 if (!(dev->flags & IFF_LOOPBACK) &&
746 !(dev->flags & IFF_POINTOPOINT) &&
747 atif_probe_device(atif) < 0) {
748 atif_drop_device(dev);
749 return -EADDRINUSE;
750 }
751
752 /* Hey it worked - add the direct routes */
753 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
754 sa->sat_family = AF_APPLETALK;
755 sa->sat_addr.s_net = atif->address.s_net;
756 sa->sat_addr.s_node = atif->address.s_node;
757 sa = (struct sockaddr_at *)&rtdef.rt_dst;
758 rtdef.rt_flags = RTF_UP;
759 sa->sat_family = AF_APPLETALK;
760 sa->sat_addr.s_node = ATADDR_ANYNODE;
761 if (dev->flags & IFF_LOOPBACK ||
762 dev->flags & IFF_POINTOPOINT)
763 rtdef.rt_flags |= RTF_HOST;
764
765 /* Routerless initial state */
766 if (nr->nr_firstnet == htons(0) &&
767 nr->nr_lastnet == htons(0xFFFE)) {
768 sa->sat_addr.s_net = atif->address.s_net;
769 atrtr_create(&rtdef, dev);
770 atrtr_set_default(dev);
771 } else {
772 limit = ntohs(nr->nr_lastnet);
773 if (limit - ntohs(nr->nr_firstnet) > 4096) {
774 printk(KERN_WARNING "Too many routes/"
775 "iface.\n");
776 return -EINVAL;
777 }
778 if (add_route)
779 for (ct = ntohs(nr->nr_firstnet);
780 ct <= limit; ct++) {
781 sa->sat_addr.s_net = htons(ct);
782 atrtr_create(&rtdef, dev);
783 }
784 }
785 dev_mc_add_global(dev, aarp_mcast);
786 return 0;
787
788 case SIOCGIFADDR:
789 if (!atif)
790 return -EADDRNOTAVAIL;
791
792 sa->sat_family = AF_APPLETALK;
793 sa->sat_addr = atif->address;
794 break;
795
796 case SIOCGIFBRDADDR:
797 if (!atif)
798 return -EADDRNOTAVAIL;
799
800 sa->sat_family = AF_APPLETALK;
801 sa->sat_addr.s_net = atif->address.s_net;
802 sa->sat_addr.s_node = ATADDR_BCAST;
803 break;
804
805 case SIOCATALKDIFADDR:
806 case SIOCDIFADDR:
807 if (!capable(CAP_NET_ADMIN))
808 return -EPERM;
809 if (sa->sat_family != AF_APPLETALK)
810 return -EINVAL;
811 atalk_dev_down(dev);
812 break;
813
814 case SIOCSARP:
815 if (!capable(CAP_NET_ADMIN))
816 return -EPERM;
817 if (sa->sat_family != AF_APPLETALK)
818 return -EINVAL;
819 /*
820 * for now, we only support proxy AARP on ELAP;
821 * we should be able to do it for LocalTalk, too.
822 */
823 if (dev->type != ARPHRD_ETHER)
824 return -EPROTONOSUPPORT;
825
826 /*
827 * atif points to the current interface on this network;
828 * we aren't concerned about its current status (at
829 * least for now), but it has all the settings about
830 * the network we're going to probe. Consequently, it
831 * must exist.
832 */
833 if (!atif)
834 return -EADDRNOTAVAIL;
835
836 nr = (struct atalk_netrange *)&(atif->nets);
837 /*
838 * Phase 1 is fine on Localtalk but we don't do
839 * Ethertalk phase 1. Anyone wanting to add it go ahead.
840 */
841 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
842 return -EPROTONOSUPPORT;
843
844 if (sa->sat_addr.s_node == ATADDR_BCAST ||
845 sa->sat_addr.s_node == 254)
846 return -EINVAL;
847
848 /*
849 * Check if the chosen address is used. If so we
850 * error and ATCP will try another.
851 */
852 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
853 return -EADDRINUSE;
854
855 /*
856 * We now have an address on the local network, and
857 * the AARP code will defend it for us until we take it
858 * down. We don't set up any routes right now, because
859 * ATCP will install them manually via SIOCADDRT.
860 */
861 break;
862
863 case SIOCDARP:
864 if (!capable(CAP_NET_ADMIN))
865 return -EPERM;
866 if (sa->sat_family != AF_APPLETALK)
867 return -EINVAL;
868 if (!atif)
869 return -EADDRNOTAVAIL;
870
871 /* give to aarp module to remove proxy entry */
872 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
873 return 0;
874 }
875
876 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
877 }
878
879 /* Routing ioctl() calls */
880 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
881 {
882 struct rtentry rt;
883
884 if (copy_from_user(&rt, arg, sizeof(rt)))
885 return -EFAULT;
886
887 switch (cmd) {
888 case SIOCDELRT:
889 if (rt.rt_dst.sa_family != AF_APPLETALK)
890 return -EINVAL;
891 return atrtr_delete(&((struct sockaddr_at *)
892 &rt.rt_dst)->sat_addr);
893
894 case SIOCADDRT: {
895 struct net_device *dev = NULL;
896 if (rt.rt_dev) {
897 char name[IFNAMSIZ];
898 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
899 return -EFAULT;
900 name[IFNAMSIZ-1] = '\0';
901 dev = __dev_get_by_name(&init_net, name);
902 if (!dev)
903 return -ENODEV;
904 }
905 return atrtr_create(&rt, dev);
906 }
907 }
908 return -EINVAL;
909 }
910
911 /**************************************************************************\
912 * *
913 * Handling for system calls applied via the various interfaces to an *
914 * AppleTalk socket object. *
915 * *
916 \**************************************************************************/
917
918 /*
919 * Checksum: This is 'optional'. It's quite likely also a good
920 * candidate for assembler hackery 8)
921 */
922 static unsigned long atalk_sum_partial(const unsigned char *data,
923 int len, unsigned long sum)
924 {
925 /* This ought to be unwrapped neatly. I'll trust gcc for now */
926 while (len--) {
927 sum += *data++;
928 sum = rol16(sum, 1);
929 }
930 return sum;
931 }
932
933 /* Checksum skb data -- similar to skb_checksum */
934 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
935 int len, unsigned long sum)
936 {
937 int start = skb_headlen(skb);
938 struct sk_buff *frag_iter;
939 int i, copy;
940
941 /* checksum stuff in header space */
942 if ( (copy = start - offset) > 0) {
943 if (copy > len)
944 copy = len;
945 sum = atalk_sum_partial(skb->data + offset, copy, sum);
946 if ( (len -= copy) == 0)
947 return sum;
948
949 offset += copy;
950 }
951
952 /* checksum stuff in frags */
953 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
954 int end;
955
956 WARN_ON(start > offset + len);
957
958 end = start + 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 offset - start, copy, sum);
968 kunmap_skb_frag(vaddr);
969
970 if (!(len -= copy))
971 return sum;
972 offset += copy;
973 }
974 start = end;
975 }
976
977 skb_walk_frags(skb, frag_iter) {
978 int end;
979
980 WARN_ON(start > offset + len);
981
982 end = start + frag_iter->len;
983 if ((copy = end - offset) > 0) {
984 if (copy > len)
985 copy = len;
986 sum = atalk_sum_skb(frag_iter, offset - start,
987 copy, sum);
988 if ((len -= copy) == 0)
989 return sum;
990 offset += copy;
991 }
992 start = end;
993 }
994
995 BUG_ON(len > 0);
996
997 return sum;
998 }
999
1000 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1001 {
1002 unsigned long sum;
1003
1004 /* skip header 4 bytes */
1005 sum = atalk_sum_skb(skb, 4, len-4, 0);
1006
1007 /* Use 0xFFFF for 0. 0 itself means none */
1008 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1009 }
1010
1011 static struct proto ddp_proto = {
1012 .name = "DDP",
1013 .owner = THIS_MODULE,
1014 .obj_size = sizeof(struct atalk_sock),
1015 };
1016
1017 /*
1018 * Create a socket. Initialise the socket, blank the addresses
1019 * set the state.
1020 */
1021 static int atalk_create(struct net *net, struct socket *sock, int protocol,
1022 int kern)
1023 {
1024 struct sock *sk;
1025 int rc = -ESOCKTNOSUPPORT;
1026
1027 if (!net_eq(net, &init_net))
1028 return -EAFNOSUPPORT;
1029
1030 /*
1031 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1032 * and gives you the full ELAP frame. Should be handy for CAP 8)
1033 */
1034 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1035 goto out;
1036 rc = -ENOMEM;
1037 sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto);
1038 if (!sk)
1039 goto out;
1040 rc = 0;
1041 sock->ops = &atalk_dgram_ops;
1042 sock_init_data(sock, sk);
1043
1044 /* Checksums on by default */
1045 sock_set_flag(sk, SOCK_ZAPPED);
1046 out:
1047 return rc;
1048 }
1049
1050 /* Free a socket. No work needed */
1051 static int atalk_release(struct socket *sock)
1052 {
1053 struct sock *sk = sock->sk;
1054
1055 lock_kernel();
1056 if (sk) {
1057 sock_orphan(sk);
1058 sock->sk = NULL;
1059 atalk_destroy_socket(sk);
1060 }
1061 unlock_kernel();
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 int err;
1138
1139 if (!sock_flag(sk, SOCK_ZAPPED) ||
1140 addr_len != sizeof(struct sockaddr_at))
1141 return -EINVAL;
1142
1143 if (addr->sat_family != AF_APPLETALK)
1144 return -EAFNOSUPPORT;
1145
1146 lock_kernel();
1147 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1148 struct atalk_addr *ap = atalk_find_primary();
1149
1150 err = -EADDRNOTAVAIL;
1151 if (!ap)
1152 goto out;
1153
1154 at->src_net = addr->sat_addr.s_net = ap->s_net;
1155 at->src_node = addr->sat_addr.s_node= ap->s_node;
1156 } else {
1157 err = -EADDRNOTAVAIL;
1158 if (!atalk_find_interface(addr->sat_addr.s_net,
1159 addr->sat_addr.s_node))
1160 goto out;
1161
1162 at->src_net = addr->sat_addr.s_net;
1163 at->src_node = addr->sat_addr.s_node;
1164 }
1165
1166 if (addr->sat_port == ATADDR_ANYPORT) {
1167 err = atalk_pick_and_bind_port(sk, addr);
1168
1169 if (err < 0)
1170 goto out;
1171 } else {
1172 at->src_port = addr->sat_port;
1173
1174 err = -EADDRINUSE;
1175 if (atalk_find_or_insert_socket(sk, addr))
1176 goto out;
1177 }
1178
1179 sock_reset_flag(sk, SOCK_ZAPPED);
1180 err = 0;
1181 out:
1182 unlock_kernel();
1183 return err;
1184 }
1185
1186 /* Set the address we talk to */
1187 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1188 int addr_len, int flags)
1189 {
1190 struct sock *sk = sock->sk;
1191 struct atalk_sock *at = at_sk(sk);
1192 struct sockaddr_at *addr;
1193 int err;
1194
1195 sk->sk_state = TCP_CLOSE;
1196 sock->state = SS_UNCONNECTED;
1197
1198 if (addr_len != sizeof(*addr))
1199 return -EINVAL;
1200
1201 addr = (struct sockaddr_at *)uaddr;
1202
1203 if (addr->sat_family != AF_APPLETALK)
1204 return -EAFNOSUPPORT;
1205
1206 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1207 !sock_flag(sk, SOCK_BROADCAST)) {
1208 #if 1
1209 printk(KERN_WARNING "%s is broken and did not set "
1210 "SO_BROADCAST. It will break when 2.2 is "
1211 "released.\n",
1212 current->comm);
1213 #else
1214 return -EACCES;
1215 #endif
1216 }
1217
1218 lock_kernel();
1219 err = -EBUSY;
1220 if (sock_flag(sk, SOCK_ZAPPED))
1221 if (atalk_autobind(sk) < 0)
1222 goto out;
1223
1224 err = -ENETUNREACH;
1225 if (!atrtr_get_dev(&addr->sat_addr))
1226 goto out;
1227
1228 at->dest_port = addr->sat_port;
1229 at->dest_net = addr->sat_addr.s_net;
1230 at->dest_node = addr->sat_addr.s_node;
1231
1232 sock->state = SS_CONNECTED;
1233 sk->sk_state = TCP_ESTABLISHED;
1234 err = 0;
1235 out:
1236 unlock_kernel();
1237 return err;
1238 }
1239
1240 /*
1241 * Find the name of an AppleTalk socket. Just copy the right
1242 * fields into the sockaddr.
1243 */
1244 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1245 int *uaddr_len, int peer)
1246 {
1247 struct sockaddr_at sat;
1248 struct sock *sk = sock->sk;
1249 struct atalk_sock *at = at_sk(sk);
1250 int err;
1251
1252 lock_kernel();
1253 err = -ENOBUFS;
1254 if (sock_flag(sk, SOCK_ZAPPED))
1255 if (atalk_autobind(sk) < 0)
1256 goto out;
1257
1258 *uaddr_len = sizeof(struct sockaddr_at);
1259 memset(&sat.sat_zero, 0, sizeof(sat.sat_zero));
1260
1261 if (peer) {
1262 err = -ENOTCONN;
1263 if (sk->sk_state != TCP_ESTABLISHED)
1264 goto out;
1265
1266 sat.sat_addr.s_net = at->dest_net;
1267 sat.sat_addr.s_node = at->dest_node;
1268 sat.sat_port = at->dest_port;
1269 } else {
1270 sat.sat_addr.s_net = at->src_net;
1271 sat.sat_addr.s_node = at->src_node;
1272 sat.sat_port = at->src_port;
1273 }
1274
1275 err = 0;
1276 sat.sat_family = AF_APPLETALK;
1277 memcpy(uaddr, &sat, sizeof(sat));
1278
1279 out:
1280 unlock_kernel();
1281 return err;
1282 }
1283
1284 static unsigned int atalk_poll(struct file *file, struct socket *sock,
1285 poll_table *wait)
1286 {
1287 int err;
1288 lock_kernel();
1289 err = datagram_poll(file, sock, wait);
1290 unlock_kernel();
1291 return err;
1292 }
1293
1294 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1295 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1296 {
1297 return skb->data[12] == 22;
1298 }
1299
1300 static int handle_ip_over_ddp(struct sk_buff *skb)
1301 {
1302 struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
1303 struct net_device_stats *stats;
1304
1305 /* This needs to be able to handle ipddp"N" devices */
1306 if (!dev) {
1307 kfree_skb(skb);
1308 return NET_RX_DROP;
1309 }
1310
1311 skb->protocol = htons(ETH_P_IP);
1312 skb_pull(skb, 13);
1313 skb->dev = dev;
1314 skb_reset_transport_header(skb);
1315
1316 stats = netdev_priv(dev);
1317 stats->rx_packets++;
1318 stats->rx_bytes += skb->len + 13;
1319 return netif_rx(skb); /* Send the SKB up to a higher place. */
1320 }
1321 #else
1322 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1323 #define is_ip_over_ddp(skb) 0
1324 #define handle_ip_over_ddp(skb) 0
1325 #endif
1326
1327 static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1328 struct ddpehdr *ddp, __u16 len_hops, int origlen)
1329 {
1330 struct atalk_route *rt;
1331 struct atalk_addr ta;
1332
1333 /*
1334 * Don't route multicast, etc., packets, or packets sent to "this
1335 * network"
1336 */
1337 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1338 /*
1339 * FIXME:
1340 *
1341 * Can it ever happen that a packet is from a PPP iface and
1342 * needs to be broadcast onto the default network?
1343 */
1344 if (dev->type == ARPHRD_PPP)
1345 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1346 "packet received from PPP iface\n");
1347 goto free_it;
1348 }
1349
1350 ta.s_net = ddp->deh_dnet;
1351 ta.s_node = ddp->deh_dnode;
1352
1353 /* Route the packet */
1354 rt = atrtr_find(&ta);
1355 /* increment hops count */
1356 len_hops += 1 << 10;
1357 if (!rt || !(len_hops & (15 << 10)))
1358 goto free_it;
1359
1360 /* FIXME: use skb->cb to be able to use shared skbs */
1361
1362 /*
1363 * Route goes through another gateway, so set the target to the
1364 * gateway instead.
1365 */
1366
1367 if (rt->flags & RTF_GATEWAY) {
1368 ta.s_net = rt->gateway.s_net;
1369 ta.s_node = rt->gateway.s_node;
1370 }
1371
1372 /* Fix up skb->len field */
1373 skb_trim(skb, min_t(unsigned int, origlen,
1374 (rt->dev->hard_header_len +
1375 ddp_dl->header_length + (len_hops & 1023))));
1376
1377 /* FIXME: use skb->cb to be able to use shared skbs */
1378 ddp->deh_len_hops = htons(len_hops);
1379
1380 /*
1381 * Send the buffer onwards
1382 *
1383 * Now we must always be careful. If it's come from LocalTalk to
1384 * EtherTalk it might not fit
1385 *
1386 * Order matters here: If a packet has to be copied to make a new
1387 * headroom (rare hopefully) then it won't need unsharing.
1388 *
1389 * Note. ddp-> becomes invalid at the realloc.
1390 */
1391 if (skb_headroom(skb) < 22) {
1392 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1393 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1394 kfree_skb(skb);
1395 skb = nskb;
1396 } else
1397 skb = skb_unshare(skb, GFP_ATOMIC);
1398
1399 /*
1400 * If the buffer didn't vanish into the lack of space bitbucket we can
1401 * send it.
1402 */
1403 if (skb == NULL)
1404 goto drop;
1405
1406 if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
1407 return NET_RX_DROP;
1408 return NET_RX_SUCCESS;
1409 free_it:
1410 kfree_skb(skb);
1411 drop:
1412 return NET_RX_DROP;
1413 }
1414
1415 /**
1416 * atalk_rcv - Receive a packet (in skb) from device dev
1417 * @skb - packet received
1418 * @dev - network device where the packet comes from
1419 * @pt - packet type
1420 *
1421 * Receive a packet (in skb) from device dev. This has come from the SNAP
1422 * decoder, and on entry skb->transport_header is the DDP header, skb->len
1423 * is the DDP header, skb->len is the DDP length. The physical headers
1424 * have been extracted. PPP should probably pass frames marked as for this
1425 * layer. [ie ARPHRD_ETHERTALK]
1426 */
1427 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1428 struct packet_type *pt, struct net_device *orig_dev)
1429 {
1430 struct ddpehdr *ddp;
1431 struct sock *sock;
1432 struct atalk_iface *atif;
1433 struct sockaddr_at tosat;
1434 int origlen;
1435 __u16 len_hops;
1436
1437 if (!net_eq(dev_net(dev), &init_net))
1438 goto drop;
1439
1440 /* Don't mangle buffer if shared */
1441 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1442 goto out;
1443
1444 /* Size check and make sure header is contiguous */
1445 if (!pskb_may_pull(skb, sizeof(*ddp)))
1446 goto drop;
1447
1448 ddp = ddp_hdr(skb);
1449
1450 len_hops = ntohs(ddp->deh_len_hops);
1451
1452 /* Trim buffer in case of stray trailing data */
1453 origlen = skb->len;
1454 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1455
1456 /*
1457 * Size check to see if ddp->deh_len was crap
1458 * (Otherwise we'll detonate most spectacularly
1459 * in the middle of atalk_checksum() or recvmsg()).
1460 */
1461 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1462 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1463 "skb->len=%u)\n", len_hops & 1023, skb->len);
1464 goto drop;
1465 }
1466
1467 /*
1468 * Any checksums. Note we don't do htons() on this == is assumed to be
1469 * valid for net byte orders all over the networking code...
1470 */
1471 if (ddp->deh_sum &&
1472 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1473 /* Not a valid AppleTalk frame - dustbin time */
1474 goto drop;
1475
1476 /* Check the packet is aimed at us */
1477 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1478 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1479 else
1480 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1481
1482 if (!atif) {
1483 /* Not ours, so we route the packet via the correct
1484 * AppleTalk iface
1485 */
1486 return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1487 }
1488
1489 /* if IP over DDP is not selected this code will be optimized out */
1490 if (is_ip_over_ddp(skb))
1491 return handle_ip_over_ddp(skb);
1492 /*
1493 * Which socket - atalk_search_socket() looks for a *full match*
1494 * of the <net, node, port> tuple.
1495 */
1496 tosat.sat_addr.s_net = ddp->deh_dnet;
1497 tosat.sat_addr.s_node = ddp->deh_dnode;
1498 tosat.sat_port = ddp->deh_dport;
1499
1500 sock = atalk_search_socket(&tosat, atif);
1501 if (!sock) /* But not one of our sockets */
1502 goto drop;
1503
1504 /* Queue packet (standard) */
1505 skb->sk = sock;
1506
1507 if (sock_queue_rcv_skb(sock, skb) < 0)
1508 goto drop;
1509
1510 return NET_RX_SUCCESS;
1511
1512 drop:
1513 kfree_skb(skb);
1514 out:
1515 return NET_RX_DROP;
1516
1517 }
1518
1519 /*
1520 * Receive a LocalTalk frame. We make some demands on the caller here.
1521 * Caller must provide enough headroom on the packet to pull the short
1522 * header and append a long one.
1523 */
1524 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1525 struct packet_type *pt, struct net_device *orig_dev)
1526 {
1527 if (!net_eq(dev_net(dev), &init_net))
1528 goto freeit;
1529
1530 /* Expand any short form frames */
1531 if (skb_mac_header(skb)[2] == 1) {
1532 struct ddpehdr *ddp;
1533 /* Find our address */
1534 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1535
1536 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1537 goto freeit;
1538
1539 /* Don't mangle buffer if shared */
1540 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1541 return 0;
1542
1543 /*
1544 * The push leaves us with a ddephdr not an shdr, and
1545 * handily the port bytes in the right place preset.
1546 */
1547 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1548
1549 /* Now fill in the long header */
1550
1551 /*
1552 * These two first. The mac overlays the new source/dest
1553 * network information so we MUST copy these before
1554 * we write the network numbers !
1555 */
1556
1557 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1558 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
1559
1560 ddp->deh_dnet = ap->s_net; /* Network number */
1561 ddp->deh_snet = ap->s_net;
1562 ddp->deh_sum = 0; /* No checksum */
1563 /*
1564 * Not sure about this bit...
1565 */
1566 /* Non routable, so force a drop if we slip up later */
1567 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1568 }
1569 skb_reset_transport_header(skb);
1570
1571 return atalk_rcv(skb, dev, pt, orig_dev);
1572 freeit:
1573 kfree_skb(skb);
1574 return 0;
1575 }
1576
1577 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1578 size_t len)
1579 {
1580 struct sock *sk = sock->sk;
1581 struct atalk_sock *at = at_sk(sk);
1582 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1583 int flags = msg->msg_flags;
1584 int loopback = 0;
1585 struct sockaddr_at local_satalk, gsat;
1586 struct sk_buff *skb;
1587 struct net_device *dev;
1588 struct ddpehdr *ddp;
1589 int size;
1590 struct atalk_route *rt;
1591 int err;
1592
1593 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1594 return -EINVAL;
1595
1596 if (len > DDP_MAXSZ)
1597 return -EMSGSIZE;
1598
1599 lock_kernel();
1600 if (usat) {
1601 err = -EBUSY;
1602 if (sock_flag(sk, SOCK_ZAPPED))
1603 if (atalk_autobind(sk) < 0)
1604 goto out;
1605
1606 err = -EINVAL;
1607 if (msg->msg_namelen < sizeof(*usat) ||
1608 usat->sat_family != AF_APPLETALK)
1609 goto out;
1610
1611 err = -EPERM;
1612 /* netatalk didn't implement this check */
1613 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1614 !sock_flag(sk, SOCK_BROADCAST)) {
1615 goto out;
1616 }
1617 } else {
1618 err = -ENOTCONN;
1619 if (sk->sk_state != TCP_ESTABLISHED)
1620 goto out;
1621 usat = &local_satalk;
1622 usat->sat_family = AF_APPLETALK;
1623 usat->sat_port = at->dest_port;
1624 usat->sat_addr.s_node = at->dest_node;
1625 usat->sat_addr.s_net = at->dest_net;
1626 }
1627
1628 /* Build a packet */
1629 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1630
1631 /* For headers */
1632 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1633
1634 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1635 rt = atrtr_find(&usat->sat_addr);
1636 } else {
1637 struct atalk_addr at_hint;
1638
1639 at_hint.s_node = 0;
1640 at_hint.s_net = at->src_net;
1641
1642 rt = atrtr_find(&at_hint);
1643 }
1644 err = ENETUNREACH;
1645 if (!rt)
1646 goto out;
1647
1648 dev = rt->dev;
1649
1650 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1651 sk, size, dev->name);
1652
1653 size += dev->hard_header_len;
1654 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1655 if (!skb)
1656 goto out;
1657
1658 skb->sk = sk;
1659 skb_reserve(skb, ddp_dl->header_length);
1660 skb_reserve(skb, dev->hard_header_len);
1661 skb->dev = dev;
1662
1663 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1664
1665 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1666 ddp->deh_len_hops = htons(len + sizeof(*ddp));
1667 ddp->deh_dnet = usat->sat_addr.s_net;
1668 ddp->deh_snet = at->src_net;
1669 ddp->deh_dnode = usat->sat_addr.s_node;
1670 ddp->deh_snode = at->src_node;
1671 ddp->deh_dport = usat->sat_port;
1672 ddp->deh_sport = at->src_port;
1673
1674 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1675
1676 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1677 if (err) {
1678 kfree_skb(skb);
1679 err = -EFAULT;
1680 goto out;
1681 }
1682
1683 if (sk->sk_no_check == 1)
1684 ddp->deh_sum = 0;
1685 else
1686 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1687
1688 /*
1689 * Loopback broadcast packets to non gateway targets (ie routes
1690 * to group we are in)
1691 */
1692 if (ddp->deh_dnode == ATADDR_BCAST &&
1693 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1694 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1695
1696 if (skb2) {
1697 loopback = 1;
1698 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1699 /*
1700 * If it fails it is queued/sent above in the aarp queue
1701 */
1702 aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
1703 }
1704 }
1705
1706 if (dev->flags & IFF_LOOPBACK || loopback) {
1707 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1708 /* loop back */
1709 skb_orphan(skb);
1710 if (ddp->deh_dnode == ATADDR_BCAST) {
1711 struct atalk_addr at_lo;
1712
1713 at_lo.s_node = 0;
1714 at_lo.s_net = 0;
1715
1716 rt = atrtr_find(&at_lo);
1717 if (!rt) {
1718 kfree_skb(skb);
1719 err = -ENETUNREACH;
1720 goto out;
1721 }
1722 dev = rt->dev;
1723 skb->dev = dev;
1724 }
1725 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1726 } else {
1727 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1728 if (rt->flags & RTF_GATEWAY) {
1729 gsat.sat_addr = rt->gateway;
1730 usat = &gsat;
1731 }
1732
1733 /*
1734 * If it fails it is queued/sent above in the aarp queue
1735 */
1736 aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
1737 }
1738 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1739
1740 out:
1741 unlock_kernel();
1742 return err ? : len;
1743 }
1744
1745 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1746 size_t size, int flags)
1747 {
1748 struct sock *sk = sock->sk;
1749 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1750 struct ddpehdr *ddp;
1751 int copied = 0;
1752 int offset = 0;
1753 int err = 0;
1754 struct sk_buff *skb;
1755
1756 lock_kernel();
1757 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1758 flags & MSG_DONTWAIT, &err);
1759 if (!skb)
1760 goto out;
1761
1762 /* FIXME: use skb->cb to be able to use shared skbs */
1763 ddp = ddp_hdr(skb);
1764 copied = ntohs(ddp->deh_len_hops) & 1023;
1765
1766 if (sk->sk_type != SOCK_RAW) {
1767 offset = sizeof(*ddp);
1768 copied -= offset;
1769 }
1770
1771 if (copied > size) {
1772 copied = size;
1773 msg->msg_flags |= MSG_TRUNC;
1774 }
1775 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1776
1777 if (!err) {
1778 if (sat) {
1779 sat->sat_family = AF_APPLETALK;
1780 sat->sat_port = ddp->deh_sport;
1781 sat->sat_addr.s_node = ddp->deh_snode;
1782 sat->sat_addr.s_net = ddp->deh_snet;
1783 }
1784 msg->msg_namelen = sizeof(*sat);
1785 }
1786
1787 skb_free_datagram(sk, skb); /* Free the datagram. */
1788
1789 out:
1790 unlock_kernel();
1791 return err ? : copied;
1792 }
1793
1794
1795 /*
1796 * AppleTalk ioctl calls.
1797 */
1798 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1799 {
1800 int rc = -ENOIOCTLCMD;
1801 struct sock *sk = sock->sk;
1802 void __user *argp = (void __user *)arg;
1803
1804 switch (cmd) {
1805 /* Protocol layer */
1806 case TIOCOUTQ: {
1807 long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1808
1809 if (amount < 0)
1810 amount = 0;
1811 rc = put_user(amount, (int __user *)argp);
1812 break;
1813 }
1814 case TIOCINQ: {
1815 /*
1816 * These two are safe on a single CPU system as only
1817 * user tasks fiddle here
1818 */
1819 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1820 long amount = 0;
1821
1822 if (skb)
1823 amount = skb->len - sizeof(struct ddpehdr);
1824 rc = put_user(amount, (int __user *)argp);
1825 break;
1826 }
1827 case SIOCGSTAMP:
1828 rc = sock_get_timestamp(sk, argp);
1829 break;
1830 case SIOCGSTAMPNS:
1831 rc = sock_get_timestampns(sk, argp);
1832 break;
1833 /* Routing */
1834 case SIOCADDRT:
1835 case SIOCDELRT:
1836 rc = -EPERM;
1837 if (capable(CAP_NET_ADMIN))
1838 rc = atrtr_ioctl(cmd, argp);
1839 break;
1840 /* Interface */
1841 case SIOCGIFADDR:
1842 case SIOCSIFADDR:
1843 case SIOCGIFBRDADDR:
1844 case SIOCATALKDIFADDR:
1845 case SIOCDIFADDR:
1846 case SIOCSARP: /* proxy AARP */
1847 case SIOCDARP: /* proxy AARP */
1848 rtnl_lock();
1849 rc = atif_ioctl(cmd, argp);
1850 rtnl_unlock();
1851 break;
1852 }
1853
1854 return rc;
1855 }
1856
1857
1858 #ifdef CONFIG_COMPAT
1859 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1860 {
1861 /*
1862 * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
1863 * cannot handle it in common code. The data we access if ifreq
1864 * here is compatible, so we can simply call the native
1865 * handler.
1866 */
1867 if (cmd == SIOCATALKDIFADDR)
1868 return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1869
1870 return -ENOIOCTLCMD;
1871 }
1872 #endif
1873
1874
1875 static const struct net_proto_family atalk_family_ops = {
1876 .family = PF_APPLETALK,
1877 .create = atalk_create,
1878 .owner = THIS_MODULE,
1879 };
1880
1881 static const struct proto_ops atalk_dgram_ops = {
1882 .family = PF_APPLETALK,
1883 .owner = THIS_MODULE,
1884 .release = atalk_release,
1885 .bind = atalk_bind,
1886 .connect = atalk_connect,
1887 .socketpair = sock_no_socketpair,
1888 .accept = sock_no_accept,
1889 .getname = atalk_getname,
1890 .poll = atalk_poll,
1891 .ioctl = atalk_ioctl,
1892 #ifdef CONFIG_COMPAT
1893 .compat_ioctl = atalk_compat_ioctl,
1894 #endif
1895 .listen = sock_no_listen,
1896 .shutdown = sock_no_shutdown,
1897 .setsockopt = sock_no_setsockopt,
1898 .getsockopt = sock_no_getsockopt,
1899 .sendmsg = atalk_sendmsg,
1900 .recvmsg = atalk_recvmsg,
1901 .mmap = sock_no_mmap,
1902 .sendpage = sock_no_sendpage,
1903 };
1904
1905 static struct notifier_block ddp_notifier = {
1906 .notifier_call = ddp_device_event,
1907 };
1908
1909 static struct packet_type ltalk_packet_type __read_mostly = {
1910 .type = cpu_to_be16(ETH_P_LOCALTALK),
1911 .func = ltalk_rcv,
1912 };
1913
1914 static struct packet_type ppptalk_packet_type __read_mostly = {
1915 .type = cpu_to_be16(ETH_P_PPPTALK),
1916 .func = atalk_rcv,
1917 };
1918
1919 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1920
1921 /* Export symbols for use by drivers when AppleTalk is a module */
1922 EXPORT_SYMBOL(atrtr_get_dev);
1923 EXPORT_SYMBOL(atalk_find_dev_addr);
1924
1925 static const char atalk_err_snap[] __initconst =
1926 KERN_CRIT "Unable to register DDP with SNAP.\n";
1927
1928 /* Called by proto.c on kernel start up */
1929 static int __init atalk_init(void)
1930 {
1931 int rc = proto_register(&ddp_proto, 0);
1932
1933 if (rc != 0)
1934 goto out;
1935
1936 (void)sock_register(&atalk_family_ops);
1937 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1938 if (!ddp_dl)
1939 printk(atalk_err_snap);
1940
1941 dev_add_pack(&ltalk_packet_type);
1942 dev_add_pack(&ppptalk_packet_type);
1943
1944 register_netdevice_notifier(&ddp_notifier);
1945 aarp_proto_init();
1946 atalk_proc_init();
1947 atalk_register_sysctl();
1948 out:
1949 return rc;
1950 }
1951 module_init(atalk_init);
1952
1953 /*
1954 * No explicit module reference count manipulation is needed in the
1955 * protocol. Socket layer sets module reference count for us
1956 * and interfaces reference counting is done
1957 * by the network device layer.
1958 *
1959 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1960 * sockets be closed from user space.
1961 */
1962 static void __exit atalk_exit(void)
1963 {
1964 #ifdef CONFIG_SYSCTL
1965 atalk_unregister_sysctl();
1966 #endif /* CONFIG_SYSCTL */
1967 atalk_proc_exit();
1968 aarp_cleanup_module(); /* General aarp clean-up. */
1969 unregister_netdevice_notifier(&ddp_notifier);
1970 dev_remove_pack(&ltalk_packet_type);
1971 dev_remove_pack(&ppptalk_packet_type);
1972 unregister_snap_client(ddp_dl);
1973 sock_unregister(PF_APPLETALK);
1974 proto_unregister(&ddp_proto);
1975 }
1976 module_exit(atalk_exit);
1977
1978 MODULE_LICENSE("GPL");
1979 MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
1980 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1981 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
linux-next