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[NET]: Make the device list and device lookups per namespace.
[thirdparty/kernel/stable.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 struct net_device *dev = ptr;
651
652 if (dev->nd_net != &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(dev, aarp_mcast, 6, 1);
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 if (!atif)
820 return -EADDRNOTAVAIL;
821
822 /*
823 * for now, we only support proxy AARP on ELAP;
824 * we should be able to do it for LocalTalk, too.
825 */
826 if (dev->type != ARPHRD_ETHER)
827 return -EPROTONOSUPPORT;
828
829 /*
830 * atif points to the current interface on this network;
831 * we aren't concerned about its current status (at
832 * least for now), but it has all the settings about
833 * the network we're going to probe. Consequently, it
834 * must exist.
835 */
836 if (!atif)
837 return -EADDRNOTAVAIL;
838
839 nr = (struct atalk_netrange *)&(atif->nets);
840 /*
841 * Phase 1 is fine on Localtalk but we don't do
842 * Ethertalk phase 1. Anyone wanting to add it go ahead.
843 */
844 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
845 return -EPROTONOSUPPORT;
846
847 if (sa->sat_addr.s_node == ATADDR_BCAST ||
848 sa->sat_addr.s_node == 254)
849 return -EINVAL;
850
851 /*
852 * Check if the chosen address is used. If so we
853 * error and ATCP will try another.
854 */
855 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
856 return -EADDRINUSE;
857
858 /*
859 * We now have an address on the local network, and
860 * the AARP code will defend it for us until we take it
861 * down. We don't set up any routes right now, because
862 * ATCP will install them manually via SIOCADDRT.
863 */
864 break;
865
866 case SIOCDARP:
867 if (!capable(CAP_NET_ADMIN))
868 return -EPERM;
869 if (sa->sat_family != AF_APPLETALK)
870 return -EINVAL;
871 if (!atif)
872 return -EADDRNOTAVAIL;
873
874 /* give to aarp module to remove proxy entry */
875 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
876 return 0;
877 }
878
879 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
880 }
881
882 /* Routing ioctl() calls */
883 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
884 {
885 struct rtentry rt;
886
887 if (copy_from_user(&rt, arg, sizeof(rt)))
888 return -EFAULT;
889
890 switch (cmd) {
891 case SIOCDELRT:
892 if (rt.rt_dst.sa_family != AF_APPLETALK)
893 return -EINVAL;
894 return atrtr_delete(&((struct sockaddr_at *)
895 &rt.rt_dst)->sat_addr);
896
897 case SIOCADDRT: {
898 struct net_device *dev = NULL;
899 if (rt.rt_dev) {
900 char name[IFNAMSIZ];
901 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
902 return -EFAULT;
903 name[IFNAMSIZ-1] = '\0';
904 dev = __dev_get_by_name(&init_net, name);
905 if (!dev)
906 return -ENODEV;
907 }
908 return atrtr_create(&rt, dev);
909 }
910 }
911 return -EINVAL;
912 }
913
914 /**************************************************************************\
915 * *
916 * Handling for system calls applied via the various interfaces to an *
917 * AppleTalk socket object. *
918 * *
919 \**************************************************************************/
920
921 /*
922 * Checksum: This is 'optional'. It's quite likely also a good
923 * candidate for assembler hackery 8)
924 */
925 static unsigned long atalk_sum_partial(const unsigned char *data,
926 int len, unsigned long sum)
927 {
928 /* This ought to be unwrapped neatly. I'll trust gcc for now */
929 while (len--) {
930 sum += *data;
931 sum <<= 1;
932 if (sum & 0x10000) {
933 sum++;
934 sum &= 0xffff;
935 }
936 data++;
937 }
938 return sum;
939 }
940
941 /* Checksum skb data -- similar to skb_checksum */
942 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
943 int len, unsigned long sum)
944 {
945 int start = skb_headlen(skb);
946 int i, copy;
947
948 /* checksum stuff in header space */
949 if ( (copy = start - offset) > 0) {
950 if (copy > len)
951 copy = len;
952 sum = atalk_sum_partial(skb->data + offset, copy, sum);
953 if ( (len -= copy) == 0)
954 return sum;
955
956 offset += copy;
957 }
958
959 /* checksum stuff in frags */
960 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
961 int end;
962
963 BUG_TRAP(start <= offset + len);
964
965 end = start + skb_shinfo(skb)->frags[i].size;
966 if ((copy = end - offset) > 0) {
967 u8 *vaddr;
968 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
969
970 if (copy > len)
971 copy = len;
972 vaddr = kmap_skb_frag(frag);
973 sum = atalk_sum_partial(vaddr + frag->page_offset +
974 offset - start, copy, sum);
975 kunmap_skb_frag(vaddr);
976
977 if (!(len -= copy))
978 return sum;
979 offset += copy;
980 }
981 start = end;
982 }
983
984 if (skb_shinfo(skb)->frag_list) {
985 struct sk_buff *list = skb_shinfo(skb)->frag_list;
986
987 for (; list; list = list->next) {
988 int end;
989
990 BUG_TRAP(start <= offset + len);
991
992 end = start + list->len;
993 if ((copy = end - offset) > 0) {
994 if (copy > len)
995 copy = len;
996 sum = atalk_sum_skb(list, offset - start,
997 copy, sum);
998 if ((len -= copy) == 0)
999 return sum;
1000 offset += copy;
1001 }
1002 start = end;
1003 }
1004 }
1005
1006 BUG_ON(len > 0);
1007
1008 return sum;
1009 }
1010
1011 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1012 {
1013 unsigned long sum;
1014
1015 /* skip header 4 bytes */
1016 sum = atalk_sum_skb(skb, 4, len-4, 0);
1017
1018 /* Use 0xFFFF for 0. 0 itself means none */
1019 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1020 }
1021
1022 static struct proto ddp_proto = {
1023 .name = "DDP",
1024 .owner = THIS_MODULE,
1025 .obj_size = sizeof(struct atalk_sock),
1026 };
1027
1028 /*
1029 * Create a socket. Initialise the socket, blank the addresses
1030 * set the state.
1031 */
1032 static int atalk_create(struct net *net, struct socket *sock, int protocol)
1033 {
1034 struct sock *sk;
1035 int rc = -ESOCKTNOSUPPORT;
1036
1037 if (net != &init_net)
1038 return -EAFNOSUPPORT;
1039
1040 /*
1041 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1042 * and gives you the full ELAP frame. Should be handy for CAP 8)
1043 */
1044 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1045 goto out;
1046 rc = -ENOMEM;
1047 sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1);
1048 if (!sk)
1049 goto out;
1050 rc = 0;
1051 sock->ops = &atalk_dgram_ops;
1052 sock_init_data(sock, sk);
1053
1054 /* Checksums on by default */
1055 sock_set_flag(sk, SOCK_ZAPPED);
1056 out:
1057 return rc;
1058 }
1059
1060 /* Free a socket. No work needed */
1061 static int atalk_release(struct socket *sock)
1062 {
1063 struct sock *sk = sock->sk;
1064
1065 if (sk) {
1066 sock_orphan(sk);
1067 sock->sk = NULL;
1068 atalk_destroy_socket(sk);
1069 }
1070 return 0;
1071 }
1072
1073 /**
1074 * atalk_pick_and_bind_port - Pick a source port when one is not given
1075 * @sk - socket to insert into the tables
1076 * @sat - address to search for
1077 *
1078 * Pick a source port when one is not given. If we can find a suitable free
1079 * one, we insert the socket into the tables using it.
1080 *
1081 * This whole operation must be atomic.
1082 */
1083 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1084 {
1085 int retval;
1086
1087 write_lock_bh(&atalk_sockets_lock);
1088
1089 for (sat->sat_port = ATPORT_RESERVED;
1090 sat->sat_port < ATPORT_LAST;
1091 sat->sat_port++) {
1092 struct sock *s;
1093 struct hlist_node *node;
1094
1095 sk_for_each(s, node, &atalk_sockets) {
1096 struct atalk_sock *at = at_sk(s);
1097
1098 if (at->src_net == sat->sat_addr.s_net &&
1099 at->src_node == sat->sat_addr.s_node &&
1100 at->src_port == sat->sat_port)
1101 goto try_next_port;
1102 }
1103
1104 /* Wheee, it's free, assign and insert. */
1105 __atalk_insert_socket(sk);
1106 at_sk(sk)->src_port = sat->sat_port;
1107 retval = 0;
1108 goto out;
1109
1110 try_next_port:;
1111 }
1112
1113 retval = -EBUSY;
1114 out:
1115 write_unlock_bh(&atalk_sockets_lock);
1116 return retval;
1117 }
1118
1119 static int atalk_autobind(struct sock *sk)
1120 {
1121 struct atalk_sock *at = at_sk(sk);
1122 struct sockaddr_at sat;
1123 struct atalk_addr *ap = atalk_find_primary();
1124 int n = -EADDRNOTAVAIL;
1125
1126 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1127 goto out;
1128
1129 at->src_net = sat.sat_addr.s_net = ap->s_net;
1130 at->src_node = sat.sat_addr.s_node = ap->s_node;
1131
1132 n = atalk_pick_and_bind_port(sk, &sat);
1133 if (!n)
1134 sock_reset_flag(sk, SOCK_ZAPPED);
1135 out:
1136 return n;
1137 }
1138
1139 /* Set the address 'our end' of the connection */
1140 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1141 {
1142 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1143 struct sock *sk = sock->sk;
1144 struct atalk_sock *at = at_sk(sk);
1145
1146 if (!sock_flag(sk, SOCK_ZAPPED) ||
1147 addr_len != sizeof(struct sockaddr_at))
1148 return -EINVAL;
1149
1150 if (addr->sat_family != AF_APPLETALK)
1151 return -EAFNOSUPPORT;
1152
1153 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1154 struct atalk_addr *ap = atalk_find_primary();
1155
1156 if (!ap)
1157 return -EADDRNOTAVAIL;
1158
1159 at->src_net = addr->sat_addr.s_net = ap->s_net;
1160 at->src_node = addr->sat_addr.s_node= ap->s_node;
1161 } else {
1162 if (!atalk_find_interface(addr->sat_addr.s_net,
1163 addr->sat_addr.s_node))
1164 return -EADDRNOTAVAIL;
1165
1166 at->src_net = addr->sat_addr.s_net;
1167 at->src_node = addr->sat_addr.s_node;
1168 }
1169
1170 if (addr->sat_port == ATADDR_ANYPORT) {
1171 int n = atalk_pick_and_bind_port(sk, addr);
1172
1173 if (n < 0)
1174 return n;
1175 } else {
1176 at->src_port = addr->sat_port;
1177
1178 if (atalk_find_or_insert_socket(sk, addr))
1179 return -EADDRINUSE;
1180 }
1181
1182 sock_reset_flag(sk, SOCK_ZAPPED);
1183 return 0;
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
1194 sk->sk_state = TCP_CLOSE;
1195 sock->state = SS_UNCONNECTED;
1196
1197 if (addr_len != sizeof(*addr))
1198 return -EINVAL;
1199
1200 addr = (struct sockaddr_at *)uaddr;
1201
1202 if (addr->sat_family != AF_APPLETALK)
1203 return -EAFNOSUPPORT;
1204
1205 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1206 !sock_flag(sk, SOCK_BROADCAST)) {
1207 #if 1
1208 printk(KERN_WARNING "%s is broken and did not set "
1209 "SO_BROADCAST. It will break when 2.2 is "
1210 "released.\n",
1211 current->comm);
1212 #else
1213 return -EACCES;
1214 #endif
1215 }
1216
1217 if (sock_flag(sk, SOCK_ZAPPED))
1218 if (atalk_autobind(sk) < 0)
1219 return -EBUSY;
1220
1221 if (!atrtr_get_dev(&addr->sat_addr))
1222 return -ENETUNREACH;
1223
1224 at->dest_port = addr->sat_port;
1225 at->dest_net = addr->sat_addr.s_net;
1226 at->dest_node = addr->sat_addr.s_node;
1227
1228 sock->state = SS_CONNECTED;
1229 sk->sk_state = TCP_ESTABLISHED;
1230 return 0;
1231 }
1232
1233 /*
1234 * Find the name of an AppleTalk socket. Just copy the right
1235 * fields into the sockaddr.
1236 */
1237 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1238 int *uaddr_len, int peer)
1239 {
1240 struct sockaddr_at sat;
1241 struct sock *sk = sock->sk;
1242 struct atalk_sock *at = at_sk(sk);
1243
1244 if (sock_flag(sk, SOCK_ZAPPED))
1245 if (atalk_autobind(sk) < 0)
1246 return -ENOBUFS;
1247
1248 *uaddr_len = sizeof(struct sockaddr_at);
1249
1250 if (peer) {
1251 if (sk->sk_state != TCP_ESTABLISHED)
1252 return -ENOTCONN;
1253
1254 sat.sat_addr.s_net = at->dest_net;
1255 sat.sat_addr.s_node = at->dest_node;
1256 sat.sat_port = at->dest_port;
1257 } else {
1258 sat.sat_addr.s_net = at->src_net;
1259 sat.sat_addr.s_node = at->src_node;
1260 sat.sat_port = at->src_port;
1261 }
1262
1263 sat.sat_family = AF_APPLETALK;
1264 memcpy(uaddr, &sat, sizeof(sat));
1265 return 0;
1266 }
1267
1268 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1269 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1270 {
1271 return skb->data[12] == 22;
1272 }
1273
1274 static int handle_ip_over_ddp(struct sk_buff *skb)
1275 {
1276 struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
1277 struct net_device_stats *stats;
1278
1279 /* This needs to be able to handle ipddp"N" devices */
1280 if (!dev)
1281 return -ENODEV;
1282
1283 skb->protocol = htons(ETH_P_IP);
1284 skb_pull(skb, 13);
1285 skb->dev = dev;
1286 skb_reset_transport_header(skb);
1287
1288 stats = dev->priv;
1289 stats->rx_packets++;
1290 stats->rx_bytes += skb->len + 13;
1291 netif_rx(skb); /* Send the SKB up to a higher place. */
1292 return 0;
1293 }
1294 #else
1295 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1296 #define is_ip_over_ddp(skb) 0
1297 #define handle_ip_over_ddp(skb) 0
1298 #endif
1299
1300 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1301 struct ddpehdr *ddp, __u16 len_hops,
1302 int origlen)
1303 {
1304 struct atalk_route *rt;
1305 struct atalk_addr ta;
1306
1307 /*
1308 * Don't route multicast, etc., packets, or packets sent to "this
1309 * network"
1310 */
1311 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1312 /*
1313 * FIXME:
1314 *
1315 * Can it ever happen that a packet is from a PPP iface and
1316 * needs to be broadcast onto the default network?
1317 */
1318 if (dev->type == ARPHRD_PPP)
1319 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1320 "packet received from PPP iface\n");
1321 goto free_it;
1322 }
1323
1324 ta.s_net = ddp->deh_dnet;
1325 ta.s_node = ddp->deh_dnode;
1326
1327 /* Route the packet */
1328 rt = atrtr_find(&ta);
1329 /* increment hops count */
1330 len_hops += 1 << 10;
1331 if (!rt || !(len_hops & (15 << 10)))
1332 goto free_it;
1333
1334 /* FIXME: use skb->cb to be able to use shared skbs */
1335
1336 /*
1337 * Route goes through another gateway, so set the target to the
1338 * gateway instead.
1339 */
1340
1341 if (rt->flags & RTF_GATEWAY) {
1342 ta.s_net = rt->gateway.s_net;
1343 ta.s_node = rt->gateway.s_node;
1344 }
1345
1346 /* Fix up skb->len field */
1347 skb_trim(skb, min_t(unsigned int, origlen,
1348 (rt->dev->hard_header_len +
1349 ddp_dl->header_length + (len_hops & 1023))));
1350
1351 /* FIXME: use skb->cb to be able to use shared skbs */
1352 ddp->deh_len_hops = htons(len_hops);
1353
1354 /*
1355 * Send the buffer onwards
1356 *
1357 * Now we must always be careful. If it's come from LocalTalk to
1358 * EtherTalk it might not fit
1359 *
1360 * Order matters here: If a packet has to be copied to make a new
1361 * headroom (rare hopefully) then it won't need unsharing.
1362 *
1363 * Note. ddp-> becomes invalid at the realloc.
1364 */
1365 if (skb_headroom(skb) < 22) {
1366 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1367 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1368 kfree_skb(skb);
1369 if (!nskb)
1370 goto out;
1371 skb = nskb;
1372 } else
1373 skb = skb_unshare(skb, GFP_ATOMIC);
1374
1375 /*
1376 * If the buffer didn't vanish into the lack of space bitbucket we can
1377 * send it.
1378 */
1379 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1380 goto free_it;
1381 out:
1382 return;
1383 free_it:
1384 kfree_skb(skb);
1385 }
1386
1387 /**
1388 * atalk_rcv - Receive a packet (in skb) from device dev
1389 * @skb - packet received
1390 * @dev - network device where the packet comes from
1391 * @pt - packet type
1392 *
1393 * Receive a packet (in skb) from device dev. This has come from the SNAP
1394 * decoder, and on entry skb->transport_header is the DDP header, skb->len
1395 * is the DDP header, skb->len is the DDP length. The physical headers
1396 * have been extracted. PPP should probably pass frames marked as for this
1397 * layer. [ie ARPHRD_ETHERTALK]
1398 */
1399 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1400 struct packet_type *pt, struct net_device *orig_dev)
1401 {
1402 struct ddpehdr *ddp;
1403 struct sock *sock;
1404 struct atalk_iface *atif;
1405 struct sockaddr_at tosat;
1406 int origlen;
1407 __u16 len_hops;
1408
1409 if (dev->nd_net != &init_net)
1410 goto freeit;
1411
1412 /* Don't mangle buffer if shared */
1413 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1414 goto out;
1415
1416 /* Size check and make sure header is contiguous */
1417 if (!pskb_may_pull(skb, sizeof(*ddp)))
1418 goto freeit;
1419
1420 ddp = ddp_hdr(skb);
1421
1422 len_hops = ntohs(ddp->deh_len_hops);
1423
1424 /* Trim buffer in case of stray trailing data */
1425 origlen = skb->len;
1426 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1427
1428 /*
1429 * Size check to see if ddp->deh_len was crap
1430 * (Otherwise we'll detonate most spectacularly
1431 * in the middle of atalk_checksum() or recvmsg()).
1432 */
1433 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1434 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1435 "skb->len=%u)\n", len_hops & 1023, skb->len);
1436 goto freeit;
1437 }
1438
1439 /*
1440 * Any checksums. Note we don't do htons() on this == is assumed to be
1441 * valid for net byte orders all over the networking code...
1442 */
1443 if (ddp->deh_sum &&
1444 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1445 /* Not a valid AppleTalk frame - dustbin time */
1446 goto freeit;
1447
1448 /* Check the packet is aimed at us */
1449 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1450 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1451 else
1452 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1453
1454 if (!atif) {
1455 /* Not ours, so we route the packet via the correct
1456 * AppleTalk iface
1457 */
1458 atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1459 goto out;
1460 }
1461
1462 /* if IP over DDP is not selected this code will be optimized out */
1463 if (is_ip_over_ddp(skb))
1464 return handle_ip_over_ddp(skb);
1465 /*
1466 * Which socket - atalk_search_socket() looks for a *full match*
1467 * of the <net, node, port> tuple.
1468 */
1469 tosat.sat_addr.s_net = ddp->deh_dnet;
1470 tosat.sat_addr.s_node = ddp->deh_dnode;
1471 tosat.sat_port = ddp->deh_dport;
1472
1473 sock = atalk_search_socket(&tosat, atif);
1474 if (!sock) /* But not one of our sockets */
1475 goto freeit;
1476
1477 /* Queue packet (standard) */
1478 skb->sk = sock;
1479
1480 if (sock_queue_rcv_skb(sock, skb) < 0)
1481 goto freeit;
1482 out:
1483 return 0;
1484 freeit:
1485 kfree_skb(skb);
1486 goto out;
1487 }
1488
1489 /*
1490 * Receive a LocalTalk frame. We make some demands on the caller here.
1491 * Caller must provide enough headroom on the packet to pull the short
1492 * header and append a long one.
1493 */
1494 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1495 struct packet_type *pt, struct net_device *orig_dev)
1496 {
1497 if (dev->nd_net != &init_net)
1498 goto freeit;
1499
1500 /* Expand any short form frames */
1501 if (skb_mac_header(skb)[2] == 1) {
1502 struct ddpehdr *ddp;
1503 /* Find our address */
1504 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1505
1506 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1507 goto freeit;
1508
1509 /* Don't mangle buffer if shared */
1510 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1511 return 0;
1512
1513 /*
1514 * The push leaves us with a ddephdr not an shdr, and
1515 * handily the port bytes in the right place preset.
1516 */
1517 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1518
1519 /* Now fill in the long header */
1520
1521 /*
1522 * These two first. The mac overlays the new source/dest
1523 * network information so we MUST copy these before
1524 * we write the network numbers !
1525 */
1526
1527 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1528 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
1529
1530 ddp->deh_dnet = ap->s_net; /* Network number */
1531 ddp->deh_snet = ap->s_net;
1532 ddp->deh_sum = 0; /* No checksum */
1533 /*
1534 * Not sure about this bit...
1535 */
1536 /* Non routable, so force a drop if we slip up later */
1537 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1538 }
1539 skb_reset_transport_header(skb);
1540
1541 return atalk_rcv(skb, dev, pt, orig_dev);
1542 freeit:
1543 kfree_skb(skb);
1544 return 0;
1545 }
1546
1547 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1548 size_t len)
1549 {
1550 struct sock *sk = sock->sk;
1551 struct atalk_sock *at = at_sk(sk);
1552 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1553 int flags = msg->msg_flags;
1554 int loopback = 0;
1555 struct sockaddr_at local_satalk, gsat;
1556 struct sk_buff *skb;
1557 struct net_device *dev;
1558 struct ddpehdr *ddp;
1559 int size;
1560 struct atalk_route *rt;
1561 int err;
1562
1563 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1564 return -EINVAL;
1565
1566 if (len > DDP_MAXSZ)
1567 return -EMSGSIZE;
1568
1569 if (usat) {
1570 if (sock_flag(sk, SOCK_ZAPPED))
1571 if (atalk_autobind(sk) < 0)
1572 return -EBUSY;
1573
1574 if (msg->msg_namelen < sizeof(*usat) ||
1575 usat->sat_family != AF_APPLETALK)
1576 return -EINVAL;
1577
1578 /* netatalk doesn't implement this check */
1579 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1580 !sock_flag(sk, SOCK_BROADCAST)) {
1581 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1582 "it will break before 2.2\n");
1583 #if 0
1584 return -EPERM;
1585 #endif
1586 }
1587 } else {
1588 if (sk->sk_state != TCP_ESTABLISHED)
1589 return -ENOTCONN;
1590 usat = &local_satalk;
1591 usat->sat_family = AF_APPLETALK;
1592 usat->sat_port = at->dest_port;
1593 usat->sat_addr.s_node = at->dest_node;
1594 usat->sat_addr.s_net = at->dest_net;
1595 }
1596
1597 /* Build a packet */
1598 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1599
1600 /* For headers */
1601 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1602
1603 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1604 rt = atrtr_find(&usat->sat_addr);
1605 } else {
1606 struct atalk_addr at_hint;
1607
1608 at_hint.s_node = 0;
1609 at_hint.s_net = at->src_net;
1610
1611 rt = atrtr_find(&at_hint);
1612 }
1613 if (!rt)
1614 return -ENETUNREACH;
1615
1616 dev = rt->dev;
1617
1618 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1619 sk, size, dev->name);
1620
1621 size += dev->hard_header_len;
1622 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1623 if (!skb)
1624 return err;
1625
1626 skb->sk = sk;
1627 skb_reserve(skb, ddp_dl->header_length);
1628 skb_reserve(skb, dev->hard_header_len);
1629 skb->dev = dev;
1630
1631 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1632
1633 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1634 ddp->deh_len_hops = htons(len + sizeof(*ddp));
1635 ddp->deh_dnet = usat->sat_addr.s_net;
1636 ddp->deh_snet = at->src_net;
1637 ddp->deh_dnode = usat->sat_addr.s_node;
1638 ddp->deh_snode = at->src_node;
1639 ddp->deh_dport = usat->sat_port;
1640 ddp->deh_sport = at->src_port;
1641
1642 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1643
1644 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1645 if (err) {
1646 kfree_skb(skb);
1647 return -EFAULT;
1648 }
1649
1650 if (sk->sk_no_check == 1)
1651 ddp->deh_sum = 0;
1652 else
1653 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1654
1655 /*
1656 * Loopback broadcast packets to non gateway targets (ie routes
1657 * to group we are in)
1658 */
1659 if (ddp->deh_dnode == ATADDR_BCAST &&
1660 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1661 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1662
1663 if (skb2) {
1664 loopback = 1;
1665 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1666 if (aarp_send_ddp(dev, skb2,
1667 &usat->sat_addr, NULL) == -1)
1668 kfree_skb(skb2);
1669 /* else queued/sent above in the aarp queue */
1670 }
1671 }
1672
1673 if (dev->flags & IFF_LOOPBACK || loopback) {
1674 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1675 /* loop back */
1676 skb_orphan(skb);
1677 if (ddp->deh_dnode == ATADDR_BCAST) {
1678 struct atalk_addr at_lo;
1679
1680 at_lo.s_node = 0;
1681 at_lo.s_net = 0;
1682
1683 rt = atrtr_find(&at_lo);
1684 if (!rt) {
1685 kfree_skb(skb);
1686 return -ENETUNREACH;
1687 }
1688 dev = rt->dev;
1689 skb->dev = dev;
1690 }
1691 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1692 } else {
1693 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1694 if (rt->flags & RTF_GATEWAY) {
1695 gsat.sat_addr = rt->gateway;
1696 usat = &gsat;
1697 }
1698
1699 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1700 kfree_skb(skb);
1701 /* else queued/sent above in the aarp queue */
1702 }
1703 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1704
1705 return len;
1706 }
1707
1708 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1709 size_t size, int flags)
1710 {
1711 struct sock *sk = sock->sk;
1712 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1713 struct ddpehdr *ddp;
1714 int copied = 0;
1715 int offset = 0;
1716 int err = 0;
1717 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1718 flags & MSG_DONTWAIT, &err);
1719 if (!skb)
1720 return err;
1721
1722 /* FIXME: use skb->cb to be able to use shared skbs */
1723 ddp = ddp_hdr(skb);
1724 copied = ntohs(ddp->deh_len_hops) & 1023;
1725
1726 if (sk->sk_type != SOCK_RAW) {
1727 offset = sizeof(*ddp);
1728 copied -= offset;
1729 }
1730
1731 if (copied > size) {
1732 copied = size;
1733 msg->msg_flags |= MSG_TRUNC;
1734 }
1735 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1736
1737 if (!err) {
1738 if (sat) {
1739 sat->sat_family = AF_APPLETALK;
1740 sat->sat_port = ddp->deh_sport;
1741 sat->sat_addr.s_node = ddp->deh_snode;
1742 sat->sat_addr.s_net = ddp->deh_snet;
1743 }
1744 msg->msg_namelen = sizeof(*sat);
1745 }
1746
1747 skb_free_datagram(sk, skb); /* Free the datagram. */
1748 return err ? : copied;
1749 }
1750
1751
1752 /*
1753 * AppleTalk ioctl calls.
1754 */
1755 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1756 {
1757 int rc = -ENOIOCTLCMD;
1758 struct sock *sk = sock->sk;
1759 void __user *argp = (void __user *)arg;
1760
1761 switch (cmd) {
1762 /* Protocol layer */
1763 case TIOCOUTQ: {
1764 long amount = sk->sk_sndbuf -
1765 atomic_read(&sk->sk_wmem_alloc);
1766
1767 if (amount < 0)
1768 amount = 0;
1769 rc = put_user(amount, (int __user *)argp);
1770 break;
1771 }
1772 case TIOCINQ: {
1773 /*
1774 * These two are safe on a single CPU system as only
1775 * user tasks fiddle here
1776 */
1777 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1778 long amount = 0;
1779
1780 if (skb)
1781 amount = skb->len - sizeof(struct ddpehdr);
1782 rc = put_user(amount, (int __user *)argp);
1783 break;
1784 }
1785 case SIOCGSTAMP:
1786 rc = sock_get_timestamp(sk, argp);
1787 break;
1788 case SIOCGSTAMPNS:
1789 rc = sock_get_timestampns(sk, argp);
1790 break;
1791 /* Routing */
1792 case SIOCADDRT:
1793 case SIOCDELRT:
1794 rc = -EPERM;
1795 if (capable(CAP_NET_ADMIN))
1796 rc = atrtr_ioctl(cmd, argp);
1797 break;
1798 /* Interface */
1799 case SIOCGIFADDR:
1800 case SIOCSIFADDR:
1801 case SIOCGIFBRDADDR:
1802 case SIOCATALKDIFADDR:
1803 case SIOCDIFADDR:
1804 case SIOCSARP: /* proxy AARP */
1805 case SIOCDARP: /* proxy AARP */
1806 rtnl_lock();
1807 rc = atif_ioctl(cmd, argp);
1808 rtnl_unlock();
1809 break;
1810 }
1811
1812 return rc;
1813 }
1814
1815
1816 #ifdef CONFIG_COMPAT
1817 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1818 {
1819 /*
1820 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And
1821 * SIOCATALKDIFADDR is handled by upper layer as well, so there is
1822 * nothing to do. Eventually SIOCATALKDIFADDR should be moved
1823 * here so there is no generic SIOCPROTOPRIVATE translation in the
1824 * system.
1825 */
1826 return -ENOIOCTLCMD;
1827 }
1828 #endif
1829
1830
1831 static struct net_proto_family atalk_family_ops = {
1832 .family = PF_APPLETALK,
1833 .create = atalk_create,
1834 .owner = THIS_MODULE,
1835 };
1836
1837 static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1838 .family = PF_APPLETALK,
1839 .owner = THIS_MODULE,
1840 .release = atalk_release,
1841 .bind = atalk_bind,
1842 .connect = atalk_connect,
1843 .socketpair = sock_no_socketpair,
1844 .accept = sock_no_accept,
1845 .getname = atalk_getname,
1846 .poll = datagram_poll,
1847 .ioctl = atalk_ioctl,
1848 #ifdef CONFIG_COMPAT
1849 .compat_ioctl = atalk_compat_ioctl,
1850 #endif
1851 .listen = sock_no_listen,
1852 .shutdown = sock_no_shutdown,
1853 .setsockopt = sock_no_setsockopt,
1854 .getsockopt = sock_no_getsockopt,
1855 .sendmsg = atalk_sendmsg,
1856 .recvmsg = atalk_recvmsg,
1857 .mmap = sock_no_mmap,
1858 .sendpage = sock_no_sendpage,
1859 };
1860
1861 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1862
1863 static struct notifier_block ddp_notifier = {
1864 .notifier_call = ddp_device_event,
1865 };
1866
1867 static struct packet_type ltalk_packet_type = {
1868 .type = __constant_htons(ETH_P_LOCALTALK),
1869 .func = ltalk_rcv,
1870 };
1871
1872 static struct packet_type ppptalk_packet_type = {
1873 .type = __constant_htons(ETH_P_PPPTALK),
1874 .func = atalk_rcv,
1875 };
1876
1877 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1878
1879 /* Export symbols for use by drivers when AppleTalk is a module */
1880 EXPORT_SYMBOL(aarp_send_ddp);
1881 EXPORT_SYMBOL(atrtr_get_dev);
1882 EXPORT_SYMBOL(atalk_find_dev_addr);
1883
1884 static char atalk_err_snap[] __initdata =
1885 KERN_CRIT "Unable to register DDP with SNAP.\n";
1886
1887 /* Called by proto.c on kernel start up */
1888 static int __init atalk_init(void)
1889 {
1890 int rc = proto_register(&ddp_proto, 0);
1891
1892 if (rc != 0)
1893 goto out;
1894
1895 (void)sock_register(&atalk_family_ops);
1896 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1897 if (!ddp_dl)
1898 printk(atalk_err_snap);
1899
1900 dev_add_pack(&ltalk_packet_type);
1901 dev_add_pack(&ppptalk_packet_type);
1902
1903 register_netdevice_notifier(&ddp_notifier);
1904 aarp_proto_init();
1905 atalk_proc_init();
1906 atalk_register_sysctl();
1907 out:
1908 return rc;
1909 }
1910 module_init(atalk_init);
1911
1912 /*
1913 * No explicit module reference count manipulation is needed in the
1914 * protocol. Socket layer sets module reference count for us
1915 * and interfaces reference counting is done
1916 * by the network device layer.
1917 *
1918 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1919 * sockets be closed from user space.
1920 */
1921 static void __exit atalk_exit(void)
1922 {
1923 #ifdef CONFIG_SYSCTL
1924 atalk_unregister_sysctl();
1925 #endif /* CONFIG_SYSCTL */
1926 atalk_proc_exit();
1927 aarp_cleanup_module(); /* General aarp clean-up. */
1928 unregister_netdevice_notifier(&ddp_notifier);
1929 dev_remove_pack(&ltalk_packet_type);
1930 dev_remove_pack(&ppptalk_packet_type);
1931 unregister_snap_client(ddp_dl);
1932 sock_unregister(PF_APPLETALK);
1933 proto_unregister(&ddp_proto);
1934 }
1935 module_exit(atalk_exit);
1936
1937 MODULE_LICENSE("GPL");
1938 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1939 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1940 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git