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net/appletalk: push down BKL into a atalk_dgram_ops
[deliverable/linux.git] / net / appletalk / ddp.c
1 /*
2 * DDP: An implementation of the AppleTalk DDP protocol for
3 * Ethernet 'ELAP'.
4 *
5 * Alan Cox <alan@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 <net/datalink.h>
60 #include <net/psnap.h>
61 #include <net/sock.h>
62 #include <net/tcp_states.h>
63 #include <net/route.h>
64 #include <linux/atalk.h>
65 #include "../core/kmap_skb.h"
66
67 struct datalink_proto *ddp_dl, *aarp_dl;
68 static const struct proto_ops atalk_dgram_ops;
69
70 /**************************************************************************\
71 * *
72 * Handlers for the socket list. *
73 * *
74 \**************************************************************************/
75
76 HLIST_HEAD(atalk_sockets);
77 DEFINE_RWLOCK(atalk_sockets_lock);
78
79 static inline void __atalk_insert_socket(struct sock *sk)
80 {
81 sk_add_node(sk, &atalk_sockets);
82 }
83
84 static inline void atalk_remove_socket(struct sock *sk)
85 {
86 write_lock_bh(&atalk_sockets_lock);
87 sk_del_node_init(sk);
88 write_unlock_bh(&atalk_sockets_lock);
89 }
90
91 static struct sock *atalk_search_socket(struct sockaddr_at *to,
92 struct atalk_iface *atif)
93 {
94 struct sock *s;
95 struct hlist_node *node;
96
97 read_lock_bh(&atalk_sockets_lock);
98 sk_for_each(s, node, &atalk_sockets) {
99 struct atalk_sock *at = at_sk(s);
100
101 if (to->sat_port != at->src_port)
102 continue;
103
104 if (to->sat_addr.s_net == ATADDR_ANYNET &&
105 to->sat_addr.s_node == ATADDR_BCAST)
106 goto found;
107
108 if (to->sat_addr.s_net == at->src_net &&
109 (to->sat_addr.s_node == at->src_node ||
110 to->sat_addr.s_node == ATADDR_BCAST ||
111 to->sat_addr.s_node == ATADDR_ANYNODE))
112 goto found;
113
114 /* XXXX.0 -- we got a request for this router. make sure
115 * that the node is appropriately set. */
116 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
117 to->sat_addr.s_net != ATADDR_ANYNET &&
118 atif->address.s_node == at->src_node) {
119 to->sat_addr.s_node = atif->address.s_node;
120 goto found;
121 }
122 }
123 s = NULL;
124 found:
125 read_unlock_bh(&atalk_sockets_lock);
126 return s;
127 }
128
129 /**
130 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
131 * @sk - socket to insert in the list if it is not there already
132 * @sat - address to search for
133 *
134 * Try to find a socket matching ADDR in the socket list, if found then return
135 * it. If not, insert SK into the socket list.
136 *
137 * This entire operation must execute atomically.
138 */
139 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
140 struct sockaddr_at *sat)
141 {
142 struct sock *s;
143 struct hlist_node *node;
144 struct atalk_sock *at;
145
146 write_lock_bh(&atalk_sockets_lock);
147 sk_for_each(s, node, &atalk_sockets) {
148 at = at_sk(s);
149
150 if (at->src_net == sat->sat_addr.s_net &&
151 at->src_node == sat->sat_addr.s_node &&
152 at->src_port == sat->sat_port)
153 goto found;
154 }
155 s = NULL;
156 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
157 found:
158 write_unlock_bh(&atalk_sockets_lock);
159 return s;
160 }
161
162 static void atalk_destroy_timer(unsigned long data)
163 {
164 struct sock *sk = (struct sock *)data;
165
166 if (sk_has_allocations(sk)) {
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 (sk_has_allocations(sk)) {
179 setup_timer(&sk->sk_timer, atalk_destroy_timer,
180 (unsigned long)sk);
181 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
182 add_timer(&sk->sk_timer);
183 } else
184 sock_put(sk);
185 }
186
187 /**************************************************************************\
188 * *
189 * Routing tables for the AppleTalk socket layer. *
190 * *
191 \**************************************************************************/
192
193 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
194 struct atalk_route *atalk_routes;
195 DEFINE_RWLOCK(atalk_routes_lock);
196
197 struct atalk_iface *atalk_interfaces;
198 DEFINE_RWLOCK(atalk_interfaces_lock);
199
200 /* For probing devices or in a routerless network */
201 struct atalk_route atrtr_default;
202
203 /* AppleTalk interface control */
204 /*
205 * Drop a device. Doesn't drop any of its routes - that is the caller's
206 * problem. Called when we down the interface or delete the address.
207 */
208 static void atif_drop_device(struct net_device *dev)
209 {
210 struct atalk_iface **iface = &atalk_interfaces;
211 struct atalk_iface *tmp;
212
213 write_lock_bh(&atalk_interfaces_lock);
214 while ((tmp = *iface) != NULL) {
215 if (tmp->dev == dev) {
216 *iface = tmp->next;
217 dev_put(dev);
218 kfree(tmp);
219 dev->atalk_ptr = NULL;
220 } else
221 iface = &tmp->next;
222 }
223 write_unlock_bh(&atalk_interfaces_lock);
224 }
225
226 static struct atalk_iface *atif_add_device(struct net_device *dev,
227 struct atalk_addr *sa)
228 {
229 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
230
231 if (!iface)
232 goto out;
233
234 dev_hold(dev);
235 iface->dev = dev;
236 dev->atalk_ptr = iface;
237 iface->address = *sa;
238 iface->status = 0;
239
240 write_lock_bh(&atalk_interfaces_lock);
241 iface->next = atalk_interfaces;
242 atalk_interfaces = iface;
243 write_unlock_bh(&atalk_interfaces_lock);
244 out:
245 return iface;
246 }
247
248 /* Perform phase 2 AARP probing on our tentative address */
249 static int atif_probe_device(struct atalk_iface *atif)
250 {
251 int netrange = ntohs(atif->nets.nr_lastnet) -
252 ntohs(atif->nets.nr_firstnet) + 1;
253 int probe_net = ntohs(atif->address.s_net);
254 int probe_node = atif->address.s_node;
255 int netct, nodect;
256
257 /* Offset the network we start probing with */
258 if (probe_net == ATADDR_ANYNET) {
259 probe_net = ntohs(atif->nets.nr_firstnet);
260 if (netrange)
261 probe_net += jiffies % netrange;
262 }
263 if (probe_node == ATADDR_ANYNODE)
264 probe_node = jiffies & 0xFF;
265
266 /* Scan the networks */
267 atif->status |= ATIF_PROBE;
268 for (netct = 0; netct <= netrange; netct++) {
269 /* Sweep the available nodes from a given start */
270 atif->address.s_net = htons(probe_net);
271 for (nodect = 0; nodect < 256; nodect++) {
272 atif->address.s_node = (nodect + probe_node) & 0xFF;
273 if (atif->address.s_node > 0 &&
274 atif->address.s_node < 254) {
275 /* Probe a proposed address */
276 aarp_probe_network(atif);
277
278 if (!(atif->status & ATIF_PROBE_FAIL)) {
279 atif->status &= ~ATIF_PROBE;
280 return 0;
281 }
282 }
283 atif->status &= ~ATIF_PROBE_FAIL;
284 }
285 probe_net++;
286 if (probe_net > ntohs(atif->nets.nr_lastnet))
287 probe_net = ntohs(atif->nets.nr_firstnet);
288 }
289 atif->status &= ~ATIF_PROBE;
290
291 return -EADDRINUSE; /* Network is full... */
292 }
293
294
295 /* Perform AARP probing for a proxy address */
296 static int atif_proxy_probe_device(struct atalk_iface *atif,
297 struct atalk_addr* proxy_addr)
298 {
299 int netrange = ntohs(atif->nets.nr_lastnet) -
300 ntohs(atif->nets.nr_firstnet) + 1;
301 /* we probe the interface's network */
302 int probe_net = ntohs(atif->address.s_net);
303 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
304 int netct, nodect;
305
306 /* Offset the network we start probing with */
307 if (probe_net == ATADDR_ANYNET) {
308 probe_net = ntohs(atif->nets.nr_firstnet);
309 if (netrange)
310 probe_net += jiffies % netrange;
311 }
312
313 if (probe_node == ATADDR_ANYNODE)
314 probe_node = jiffies & 0xFF;
315
316 /* Scan the networks */
317 for (netct = 0; netct <= netrange; netct++) {
318 /* Sweep the available nodes from a given start */
319 proxy_addr->s_net = htons(probe_net);
320 for (nodect = 0; nodect < 256; nodect++) {
321 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
322 if (proxy_addr->s_node > 0 &&
323 proxy_addr->s_node < 254) {
324 /* Tell AARP to probe a proposed address */
325 int ret = aarp_proxy_probe_network(atif,
326 proxy_addr);
327
328 if (ret != -EADDRINUSE)
329 return ret;
330 }
331 }
332 probe_net++;
333 if (probe_net > ntohs(atif->nets.nr_lastnet))
334 probe_net = ntohs(atif->nets.nr_firstnet);
335 }
336
337 return -EADDRINUSE; /* Network is full... */
338 }
339
340
341 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
342 {
343 struct atalk_iface *iface = dev->atalk_ptr;
344 return iface ? &iface->address : NULL;
345 }
346
347 static struct atalk_addr *atalk_find_primary(void)
348 {
349 struct atalk_iface *fiface = NULL;
350 struct atalk_addr *retval;
351 struct atalk_iface *iface;
352
353 /*
354 * Return a point-to-point interface only if
355 * there is no non-ptp interface available.
356 */
357 read_lock_bh(&atalk_interfaces_lock);
358 for (iface = atalk_interfaces; iface; iface = iface->next) {
359 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
360 fiface = iface;
361 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
362 retval = &iface->address;
363 goto out;
364 }
365 }
366
367 if (fiface)
368 retval = &fiface->address;
369 else if (atalk_interfaces)
370 retval = &atalk_interfaces->address;
371 else
372 retval = NULL;
373 out:
374 read_unlock_bh(&atalk_interfaces_lock);
375 return retval;
376 }
377
378 /*
379 * Find a match for 'any network' - ie any of our interfaces with that
380 * node number will do just nicely.
381 */
382 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
383 {
384 struct atalk_iface *iface = dev->atalk_ptr;
385
386 if (!iface || iface->status & ATIF_PROBE)
387 goto out_err;
388
389 if (node != ATADDR_BCAST &&
390 iface->address.s_node != node &&
391 node != ATADDR_ANYNODE)
392 goto out_err;
393 out:
394 return iface;
395 out_err:
396 iface = NULL;
397 goto out;
398 }
399
400 /* Find a match for a specific network:node pair */
401 static struct atalk_iface *atalk_find_interface(__be16 net, int node)
402 {
403 struct atalk_iface *iface;
404
405 read_lock_bh(&atalk_interfaces_lock);
406 for (iface = atalk_interfaces; iface; iface = iface->next) {
407 if ((node == ATADDR_BCAST ||
408 node == ATADDR_ANYNODE ||
409 iface->address.s_node == node) &&
410 iface->address.s_net == net &&
411 !(iface->status & ATIF_PROBE))
412 break;
413
414 /* XXXX.0 -- net.0 returns the iface associated with net */
415 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
416 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
417 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
418 break;
419 }
420 read_unlock_bh(&atalk_interfaces_lock);
421 return iface;
422 }
423
424
425 /*
426 * Find a route for an AppleTalk packet. This ought to get cached in
427 * the socket (later on...). We know about host routes and the fact
428 * that a route must be direct to broadcast.
429 */
430 static struct atalk_route *atrtr_find(struct atalk_addr *target)
431 {
432 /*
433 * we must search through all routes unless we find a
434 * host route, because some host routes might overlap
435 * network routes
436 */
437 struct atalk_route *net_route = NULL;
438 struct atalk_route *r;
439
440 read_lock_bh(&atalk_routes_lock);
441 for (r = atalk_routes; r; r = r->next) {
442 if (!(r->flags & RTF_UP))
443 continue;
444
445 if (r->target.s_net == target->s_net) {
446 if (r->flags & RTF_HOST) {
447 /*
448 * if this host route is for the target,
449 * the we're done
450 */
451 if (r->target.s_node == target->s_node)
452 goto out;
453 } else
454 /*
455 * this route will work if there isn't a
456 * direct host route, so cache it
457 */
458 net_route = r;
459 }
460 }
461
462 /*
463 * if we found a network route but not a direct host
464 * route, then return it
465 */
466 if (net_route)
467 r = net_route;
468 else if (atrtr_default.dev)
469 r = &atrtr_default;
470 else /* No route can be found */
471 r = NULL;
472 out:
473 read_unlock_bh(&atalk_routes_lock);
474 return r;
475 }
476
477
478 /*
479 * Given an AppleTalk network, find the device to use. This can be
480 * a simple lookup.
481 */
482 struct net_device *atrtr_get_dev(struct atalk_addr *sa)
483 {
484 struct atalk_route *atr = atrtr_find(sa);
485 return atr ? atr->dev : NULL;
486 }
487
488 /* Set up a default router */
489 static void atrtr_set_default(struct net_device *dev)
490 {
491 atrtr_default.dev = dev;
492 atrtr_default.flags = RTF_UP;
493 atrtr_default.gateway.s_net = htons(0);
494 atrtr_default.gateway.s_node = 0;
495 }
496
497 /*
498 * Add a router. Basically make sure it looks valid and stuff the
499 * entry in the list. While it uses netranges we always set them to one
500 * entry to work like netatalk.
501 */
502 static int atrtr_create(struct rtentry *r, struct net_device *devhint)
503 {
504 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
505 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
506 struct atalk_route *rt;
507 struct atalk_iface *iface, *riface;
508 int retval = -EINVAL;
509
510 /*
511 * Fixme: Raise/Lower a routing change semaphore for these
512 * operations.
513 */
514
515 /* Validate the request */
516 if (ta->sat_family != AF_APPLETALK ||
517 (!devhint && ga->sat_family != AF_APPLETALK))
518 goto out;
519
520 /* Now walk the routing table and make our decisions */
521 write_lock_bh(&atalk_routes_lock);
522 for (rt = atalk_routes; rt; rt = rt->next) {
523 if (r->rt_flags != rt->flags)
524 continue;
525
526 if (ta->sat_addr.s_net == rt->target.s_net) {
527 if (!(rt->flags & RTF_HOST))
528 break;
529 if (ta->sat_addr.s_node == rt->target.s_node)
530 break;
531 }
532 }
533
534 if (!devhint) {
535 riface = NULL;
536
537 read_lock_bh(&atalk_interfaces_lock);
538 for (iface = atalk_interfaces; iface; iface = iface->next) {
539 if (!riface &&
540 ntohs(ga->sat_addr.s_net) >=
541 ntohs(iface->nets.nr_firstnet) &&
542 ntohs(ga->sat_addr.s_net) <=
543 ntohs(iface->nets.nr_lastnet))
544 riface = iface;
545
546 if (ga->sat_addr.s_net == iface->address.s_net &&
547 ga->sat_addr.s_node == iface->address.s_node)
548 riface = iface;
549 }
550 read_unlock_bh(&atalk_interfaces_lock);
551
552 retval = -ENETUNREACH;
553 if (!riface)
554 goto out_unlock;
555
556 devhint = riface->dev;
557 }
558
559 if (!rt) {
560 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
561
562 retval = -ENOBUFS;
563 if (!rt)
564 goto out_unlock;
565
566 rt->next = atalk_routes;
567 atalk_routes = rt;
568 }
569
570 /* Fill in the routing entry */
571 rt->target = ta->sat_addr;
572 dev_hold(devhint);
573 rt->dev = devhint;
574 rt->flags = r->rt_flags;
575 rt->gateway = ga->sat_addr;
576
577 retval = 0;
578 out_unlock:
579 write_unlock_bh(&atalk_routes_lock);
580 out:
581 return retval;
582 }
583
584 /* Delete a route. Find it and discard it */
585 static int atrtr_delete(struct atalk_addr * addr)
586 {
587 struct atalk_route **r = &atalk_routes;
588 int retval = 0;
589 struct atalk_route *tmp;
590
591 write_lock_bh(&atalk_routes_lock);
592 while ((tmp = *r) != NULL) {
593 if (tmp->target.s_net == addr->s_net &&
594 (!(tmp->flags&RTF_GATEWAY) ||
595 tmp->target.s_node == addr->s_node)) {
596 *r = tmp->next;
597 dev_put(tmp->dev);
598 kfree(tmp);
599 goto out;
600 }
601 r = &tmp->next;
602 }
603 retval = -ENOENT;
604 out:
605 write_unlock_bh(&atalk_routes_lock);
606 return retval;
607 }
608
609 /*
610 * Called when a device is downed. Just throw away any routes
611 * via it.
612 */
613 static void atrtr_device_down(struct net_device *dev)
614 {
615 struct atalk_route **r = &atalk_routes;
616 struct atalk_route *tmp;
617
618 write_lock_bh(&atalk_routes_lock);
619 while ((tmp = *r) != NULL) {
620 if (tmp->dev == dev) {
621 *r = tmp->next;
622 dev_put(dev);
623 kfree(tmp);
624 } else
625 r = &tmp->next;
626 }
627 write_unlock_bh(&atalk_routes_lock);
628
629 if (atrtr_default.dev == dev)
630 atrtr_set_default(NULL);
631 }
632
633 /* Actually down the interface */
634 static inline void atalk_dev_down(struct net_device *dev)
635 {
636 atrtr_device_down(dev); /* Remove all routes for the device */
637 aarp_device_down(dev); /* Remove AARP entries for the device */
638 atif_drop_device(dev); /* Remove the device */
639 }
640
641 /*
642 * A device event has occurred. Watch for devices going down and
643 * delete our use of them (iface and route).
644 */
645 static int ddp_device_event(struct notifier_block *this, unsigned long event,
646 void *ptr)
647 {
648 struct net_device *dev = ptr;
649
650 if (!net_eq(dev_net(dev), &init_net))
651 return NOTIFY_DONE;
652
653 if (event == NETDEV_DOWN)
654 /* Discard any use of this */
655 atalk_dev_down(dev);
656
657 return NOTIFY_DONE;
658 }
659
660 /* ioctl calls. Shouldn't even need touching */
661 /* Device configuration ioctl calls */
662 static int atif_ioctl(int cmd, void __user *arg)
663 {
664 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
665 struct ifreq atreq;
666 struct atalk_netrange *nr;
667 struct sockaddr_at *sa;
668 struct net_device *dev;
669 struct atalk_iface *atif;
670 int ct;
671 int limit;
672 struct rtentry rtdef;
673 int add_route;
674
675 if (copy_from_user(&atreq, arg, sizeof(atreq)))
676 return -EFAULT;
677
678 dev = __dev_get_by_name(&init_net, atreq.ifr_name);
679 if (!dev)
680 return -ENODEV;
681
682 sa = (struct sockaddr_at *)&atreq.ifr_addr;
683 atif = atalk_find_dev(dev);
684
685 switch (cmd) {
686 case SIOCSIFADDR:
687 if (!capable(CAP_NET_ADMIN))
688 return -EPERM;
689 if (sa->sat_family != AF_APPLETALK)
690 return -EINVAL;
691 if (dev->type != ARPHRD_ETHER &&
692 dev->type != ARPHRD_LOOPBACK &&
693 dev->type != ARPHRD_LOCALTLK &&
694 dev->type != ARPHRD_PPP)
695 return -EPROTONOSUPPORT;
696
697 nr = (struct atalk_netrange *)&sa->sat_zero[0];
698 add_route = 1;
699
700 /*
701 * if this is a point-to-point iface, and we already
702 * have an iface for this AppleTalk address, then we
703 * should not add a route
704 */
705 if ((dev->flags & IFF_POINTOPOINT) &&
706 atalk_find_interface(sa->sat_addr.s_net,
707 sa->sat_addr.s_node)) {
708 printk(KERN_DEBUG "AppleTalk: point-to-point "
709 "interface added with "
710 "existing address\n");
711 add_route = 0;
712 }
713
714 /*
715 * Phase 1 is fine on LocalTalk but we don't do
716 * EtherTalk phase 1. Anyone wanting to add it go ahead.
717 */
718 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
719 return -EPROTONOSUPPORT;
720 if (sa->sat_addr.s_node == ATADDR_BCAST ||
721 sa->sat_addr.s_node == 254)
722 return -EINVAL;
723 if (atif) {
724 /* Already setting address */
725 if (atif->status & ATIF_PROBE)
726 return -EBUSY;
727
728 atif->address.s_net = sa->sat_addr.s_net;
729 atif->address.s_node = sa->sat_addr.s_node;
730 atrtr_device_down(dev); /* Flush old routes */
731 } else {
732 atif = atif_add_device(dev, &sa->sat_addr);
733 if (!atif)
734 return -ENOMEM;
735 }
736 atif->nets = *nr;
737
738 /*
739 * Check if the chosen address is used. If so we
740 * error and atalkd will try another.
741 */
742
743 if (!(dev->flags & IFF_LOOPBACK) &&
744 !(dev->flags & IFF_POINTOPOINT) &&
745 atif_probe_device(atif) < 0) {
746 atif_drop_device(dev);
747 return -EADDRINUSE;
748 }
749
750 /* Hey it worked - add the direct routes */
751 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
752 sa->sat_family = AF_APPLETALK;
753 sa->sat_addr.s_net = atif->address.s_net;
754 sa->sat_addr.s_node = atif->address.s_node;
755 sa = (struct sockaddr_at *)&rtdef.rt_dst;
756 rtdef.rt_flags = RTF_UP;
757 sa->sat_family = AF_APPLETALK;
758 sa->sat_addr.s_node = ATADDR_ANYNODE;
759 if (dev->flags & IFF_LOOPBACK ||
760 dev->flags & IFF_POINTOPOINT)
761 rtdef.rt_flags |= RTF_HOST;
762
763 /* Routerless initial state */
764 if (nr->nr_firstnet == htons(0) &&
765 nr->nr_lastnet == htons(0xFFFE)) {
766 sa->sat_addr.s_net = atif->address.s_net;
767 atrtr_create(&rtdef, dev);
768 atrtr_set_default(dev);
769 } else {
770 limit = ntohs(nr->nr_lastnet);
771 if (limit - ntohs(nr->nr_firstnet) > 4096) {
772 printk(KERN_WARNING "Too many routes/"
773 "iface.\n");
774 return -EINVAL;
775 }
776 if (add_route)
777 for (ct = ntohs(nr->nr_firstnet);
778 ct <= limit; ct++) {
779 sa->sat_addr.s_net = htons(ct);
780 atrtr_create(&rtdef, dev);
781 }
782 }
783 dev_mc_add(dev, aarp_mcast, 6, 1);
784 return 0;
785
786 case SIOCGIFADDR:
787 if (!atif)
788 return -EADDRNOTAVAIL;
789
790 sa->sat_family = AF_APPLETALK;
791 sa->sat_addr = atif->address;
792 break;
793
794 case SIOCGIFBRDADDR:
795 if (!atif)
796 return -EADDRNOTAVAIL;
797
798 sa->sat_family = AF_APPLETALK;
799 sa->sat_addr.s_net = atif->address.s_net;
800 sa->sat_addr.s_node = ATADDR_BCAST;
801 break;
802
803 case SIOCATALKDIFADDR:
804 case SIOCDIFADDR:
805 if (!capable(CAP_NET_ADMIN))
806 return -EPERM;
807 if (sa->sat_family != AF_APPLETALK)
808 return -EINVAL;
809 atalk_dev_down(dev);
810 break;
811
812 case SIOCSARP:
813 if (!capable(CAP_NET_ADMIN))
814 return -EPERM;
815 if (sa->sat_family != AF_APPLETALK)
816 return -EINVAL;
817 /*
818 * for now, we only support proxy AARP on ELAP;
819 * we should be able to do it for LocalTalk, too.
820 */
821 if (dev->type != ARPHRD_ETHER)
822 return -EPROTONOSUPPORT;
823
824 /*
825 * atif points to the current interface on this network;
826 * we aren't concerned about its current status (at
827 * least for now), but it has all the settings about
828 * the network we're going to probe. Consequently, it
829 * must exist.
830 */
831 if (!atif)
832 return -EADDRNOTAVAIL;
833
834 nr = (struct atalk_netrange *)&(atif->nets);
835 /*
836 * Phase 1 is fine on Localtalk but we don't do
837 * Ethertalk phase 1. Anyone wanting to add it go ahead.
838 */
839 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
840 return -EPROTONOSUPPORT;
841
842 if (sa->sat_addr.s_node == ATADDR_BCAST ||
843 sa->sat_addr.s_node == 254)
844 return -EINVAL;
845
846 /*
847 * Check if the chosen address is used. If so we
848 * error and ATCP will try another.
849 */
850 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
851 return -EADDRINUSE;
852
853 /*
854 * We now have an address on the local network, and
855 * the AARP code will defend it for us until we take it
856 * down. We don't set up any routes right now, because
857 * ATCP will install them manually via SIOCADDRT.
858 */
859 break;
860
861 case SIOCDARP:
862 if (!capable(CAP_NET_ADMIN))
863 return -EPERM;
864 if (sa->sat_family != AF_APPLETALK)
865 return -EINVAL;
866 if (!atif)
867 return -EADDRNOTAVAIL;
868
869 /* give to aarp module to remove proxy entry */
870 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
871 return 0;
872 }
873
874 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
875 }
876
877 /* Routing ioctl() calls */
878 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
879 {
880 struct rtentry rt;
881
882 if (copy_from_user(&rt, arg, sizeof(rt)))
883 return -EFAULT;
884
885 switch (cmd) {
886 case SIOCDELRT:
887 if (rt.rt_dst.sa_family != AF_APPLETALK)
888 return -EINVAL;
889 return atrtr_delete(&((struct sockaddr_at *)
890 &rt.rt_dst)->sat_addr);
891
892 case SIOCADDRT: {
893 struct net_device *dev = NULL;
894 if (rt.rt_dev) {
895 char name[IFNAMSIZ];
896 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
897 return -EFAULT;
898 name[IFNAMSIZ-1] = '\0';
899 dev = __dev_get_by_name(&init_net, name);
900 if (!dev)
901 return -ENODEV;
902 }
903 return atrtr_create(&rt, dev);
904 }
905 }
906 return -EINVAL;
907 }
908
909 /**************************************************************************\
910 * *
911 * Handling for system calls applied via the various interfaces to an *
912 * AppleTalk socket object. *
913 * *
914 \**************************************************************************/
915
916 /*
917 * Checksum: This is 'optional'. It's quite likely also a good
918 * candidate for assembler hackery 8)
919 */
920 static unsigned long atalk_sum_partial(const unsigned char *data,
921 int len, unsigned long sum)
922 {
923 /* This ought to be unwrapped neatly. I'll trust gcc for now */
924 while (len--) {
925 sum += *data;
926 sum <<= 1;
927 if (sum & 0x10000) {
928 sum++;
929 sum &= 0xffff;
930 }
931 data++;
932 }
933 return sum;
934 }
935
936 /* Checksum skb data -- similar to skb_checksum */
937 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
938 int len, unsigned long sum)
939 {
940 int start = skb_headlen(skb);
941 struct sk_buff *frag_iter;
942 int i, copy;
943
944 /* checksum stuff in header space */
945 if ( (copy = start - offset) > 0) {
946 if (copy > len)
947 copy = len;
948 sum = atalk_sum_partial(skb->data + offset, copy, sum);
949 if ( (len -= copy) == 0)
950 return sum;
951
952 offset += copy;
953 }
954
955 /* checksum stuff in frags */
956 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
957 int end;
958
959 WARN_ON(start > offset + len);
960
961 end = start + skb_shinfo(skb)->frags[i].size;
962 if ((copy = end - offset) > 0) {
963 u8 *vaddr;
964 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
965
966 if (copy > len)
967 copy = len;
968 vaddr = kmap_skb_frag(frag);
969 sum = atalk_sum_partial(vaddr + frag->page_offset +
970 offset - start, copy, sum);
971 kunmap_skb_frag(vaddr);
972
973 if (!(len -= copy))
974 return sum;
975 offset += copy;
976 }
977 start = end;
978 }
979
980 skb_walk_frags(skb, frag_iter) {
981 int end;
982
983 WARN_ON(start > offset + len);
984
985 end = start + frag_iter->len;
986 if ((copy = end - offset) > 0) {
987 if (copy > len)
988 copy = len;
989 sum = atalk_sum_skb(frag_iter, offset - start,
990 copy, sum);
991 if ((len -= copy) == 0)
992 return sum;
993 offset += copy;
994 }
995 start = end;
996 }
997
998 BUG_ON(len > 0);
999
1000 return sum;
1001 }
1002
1003 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1004 {
1005 unsigned long sum;
1006
1007 /* skip header 4 bytes */
1008 sum = atalk_sum_skb(skb, 4, len-4, 0);
1009
1010 /* Use 0xFFFF for 0. 0 itself means none */
1011 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1012 }
1013
1014 static struct proto ddp_proto = {
1015 .name = "DDP",
1016 .owner = THIS_MODULE,
1017 .obj_size = sizeof(struct atalk_sock),
1018 };
1019
1020 /*
1021 * Create a socket. Initialise the socket, blank the addresses
1022 * set the state.
1023 */
1024 static int atalk_create(struct net *net, struct socket *sock, int protocol,
1025 int kern)
1026 {
1027 struct sock *sk;
1028 int rc = -ESOCKTNOSUPPORT;
1029
1030 if (net != &init_net)
1031 return -EAFNOSUPPORT;
1032
1033 /*
1034 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1035 * and gives you the full ELAP frame. Should be handy for CAP 8)
1036 */
1037 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1038 goto out;
1039 rc = -ENOMEM;
1040 sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto);
1041 if (!sk)
1042 goto out;
1043 rc = 0;
1044 sock->ops = &atalk_dgram_ops;
1045 sock_init_data(sock, sk);
1046
1047 /* Checksums on by default */
1048 sock_set_flag(sk, SOCK_ZAPPED);
1049 out:
1050 return rc;
1051 }
1052
1053 /* Free a socket. No work needed */
1054 static int atalk_release(struct socket *sock)
1055 {
1056 struct sock *sk = sock->sk;
1057
1058 lock_kernel();
1059 if (sk) {
1060 sock_orphan(sk);
1061 sock->sk = NULL;
1062 atalk_destroy_socket(sk);
1063 }
1064 unlock_kernel();
1065 return 0;
1066 }
1067
1068 /**
1069 * atalk_pick_and_bind_port - Pick a source port when one is not given
1070 * @sk - socket to insert into the tables
1071 * @sat - address to search for
1072 *
1073 * Pick a source port when one is not given. If we can find a suitable free
1074 * one, we insert the socket into the tables using it.
1075 *
1076 * This whole operation must be atomic.
1077 */
1078 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1079 {
1080 int retval;
1081
1082 write_lock_bh(&atalk_sockets_lock);
1083
1084 for (sat->sat_port = ATPORT_RESERVED;
1085 sat->sat_port < ATPORT_LAST;
1086 sat->sat_port++) {
1087 struct sock *s;
1088 struct hlist_node *node;
1089
1090 sk_for_each(s, node, &atalk_sockets) {
1091 struct atalk_sock *at = at_sk(s);
1092
1093 if (at->src_net == sat->sat_addr.s_net &&
1094 at->src_node == sat->sat_addr.s_node &&
1095 at->src_port == sat->sat_port)
1096 goto try_next_port;
1097 }
1098
1099 /* Wheee, it's free, assign and insert. */
1100 __atalk_insert_socket(sk);
1101 at_sk(sk)->src_port = sat->sat_port;
1102 retval = 0;
1103 goto out;
1104
1105 try_next_port:;
1106 }
1107
1108 retval = -EBUSY;
1109 out:
1110 write_unlock_bh(&atalk_sockets_lock);
1111 return retval;
1112 }
1113
1114 static int atalk_autobind(struct sock *sk)
1115 {
1116 struct atalk_sock *at = at_sk(sk);
1117 struct sockaddr_at sat;
1118 struct atalk_addr *ap = atalk_find_primary();
1119 int n = -EADDRNOTAVAIL;
1120
1121 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1122 goto out;
1123
1124 at->src_net = sat.sat_addr.s_net = ap->s_net;
1125 at->src_node = sat.sat_addr.s_node = ap->s_node;
1126
1127 n = atalk_pick_and_bind_port(sk, &sat);
1128 if (!n)
1129 sock_reset_flag(sk, SOCK_ZAPPED);
1130 out:
1131 return n;
1132 }
1133
1134 /* Set the address 'our end' of the connection */
1135 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1136 {
1137 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1138 struct sock *sk = sock->sk;
1139 struct atalk_sock *at = at_sk(sk);
1140 int err;
1141
1142 if (!sock_flag(sk, SOCK_ZAPPED) ||
1143 addr_len != sizeof(struct sockaddr_at))
1144 return -EINVAL;
1145
1146 if (addr->sat_family != AF_APPLETALK)
1147 return -EAFNOSUPPORT;
1148
1149 lock_kernel();
1150 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1151 struct atalk_addr *ap = atalk_find_primary();
1152
1153 err = -EADDRNOTAVAIL;
1154 if (!ap)
1155 goto out;
1156
1157 at->src_net = addr->sat_addr.s_net = ap->s_net;
1158 at->src_node = addr->sat_addr.s_node= ap->s_node;
1159 } else {
1160 err = -EADDRNOTAVAIL;
1161 if (!atalk_find_interface(addr->sat_addr.s_net,
1162 addr->sat_addr.s_node))
1163 goto out;
1164
1165 at->src_net = addr->sat_addr.s_net;
1166 at->src_node = addr->sat_addr.s_node;
1167 }
1168
1169 if (addr->sat_port == ATADDR_ANYPORT) {
1170 err = atalk_pick_and_bind_port(sk, addr);
1171
1172 if (err < 0)
1173 goto out;
1174 } else {
1175 at->src_port = addr->sat_port;
1176
1177 err = -EADDRINUSE;
1178 if (atalk_find_or_insert_socket(sk, addr))
1179 goto out;
1180 }
1181
1182 sock_reset_flag(sk, SOCK_ZAPPED);
1183 err = 0;
1184 out:
1185 unlock_kernel();
1186 return err;
1187 }
1188
1189 /* Set the address we talk to */
1190 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1191 int addr_len, int flags)
1192 {
1193 struct sock *sk = sock->sk;
1194 struct atalk_sock *at = at_sk(sk);
1195 struct sockaddr_at *addr;
1196 int err;
1197
1198 sk->sk_state = TCP_CLOSE;
1199 sock->state = SS_UNCONNECTED;
1200
1201 if (addr_len != sizeof(*addr))
1202 return -EINVAL;
1203
1204 addr = (struct sockaddr_at *)uaddr;
1205
1206 if (addr->sat_family != AF_APPLETALK)
1207 return -EAFNOSUPPORT;
1208
1209 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1210 !sock_flag(sk, SOCK_BROADCAST)) {
1211 #if 1
1212 printk(KERN_WARNING "%s is broken and did not set "
1213 "SO_BROADCAST. It will break when 2.2 is "
1214 "released.\n",
1215 current->comm);
1216 #else
1217 return -EACCES;
1218 #endif
1219 }
1220
1221 lock_kernel();
1222 err = -EBUSY;
1223 if (sock_flag(sk, SOCK_ZAPPED))
1224 if (atalk_autobind(sk) < 0)
1225 goto out;
1226
1227 err = -ENETUNREACH;
1228 if (!atrtr_get_dev(&addr->sat_addr))
1229 goto out;
1230
1231 at->dest_port = addr->sat_port;
1232 at->dest_net = addr->sat_addr.s_net;
1233 at->dest_node = addr->sat_addr.s_node;
1234
1235 sock->state = SS_CONNECTED;
1236 sk->sk_state = TCP_ESTABLISHED;
1237 err = 0;
1238 out:
1239 unlock_kernel();
1240 return err;
1241 }
1242
1243 /*
1244 * Find the name of an AppleTalk socket. Just copy the right
1245 * fields into the sockaddr.
1246 */
1247 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1248 int *uaddr_len, int peer)
1249 {
1250 struct sockaddr_at sat;
1251 struct sock *sk = sock->sk;
1252 struct atalk_sock *at = at_sk(sk);
1253 int err;
1254
1255 lock_kernel();
1256 err = -ENOBUFS;
1257 if (sock_flag(sk, SOCK_ZAPPED))
1258 if (atalk_autobind(sk) < 0)
1259 goto out;
1260
1261 *uaddr_len = sizeof(struct sockaddr_at);
1262 memset(&sat.sat_zero, 0, sizeof(sat.sat_zero));
1263
1264 if (peer) {
1265 err = -ENOTCONN;
1266 if (sk->sk_state != TCP_ESTABLISHED)
1267 goto out;
1268
1269 sat.sat_addr.s_net = at->dest_net;
1270 sat.sat_addr.s_node = at->dest_node;
1271 sat.sat_port = at->dest_port;
1272 } else {
1273 sat.sat_addr.s_net = at->src_net;
1274 sat.sat_addr.s_node = at->src_node;
1275 sat.sat_port = at->src_port;
1276 }
1277
1278 err = 0;
1279 sat.sat_family = AF_APPLETALK;
1280 memcpy(uaddr, &sat, sizeof(sat));
1281
1282 out:
1283 unlock_kernel();
1284 return err;
1285 }
1286
1287 static unsigned int atalk_poll(struct file *file, struct socket *sock,
1288 poll_table *wait)
1289 {
1290 int err;
1291 lock_kernel();
1292 err = datagram_poll(file, sock, wait);
1293 unlock_kernel();
1294 return err;
1295 }
1296
1297 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1298 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1299 {
1300 return skb->data[12] == 22;
1301 }
1302
1303 static int handle_ip_over_ddp(struct sk_buff *skb)
1304 {
1305 struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
1306 struct net_device_stats *stats;
1307
1308 /* This needs to be able to handle ipddp"N" devices */
1309 if (!dev) {
1310 kfree_skb(skb);
1311 return NET_RX_DROP;
1312 }
1313
1314 skb->protocol = htons(ETH_P_IP);
1315 skb_pull(skb, 13);
1316 skb->dev = dev;
1317 skb_reset_transport_header(skb);
1318
1319 stats = netdev_priv(dev);
1320 stats->rx_packets++;
1321 stats->rx_bytes += skb->len + 13;
1322 return netif_rx(skb); /* Send the SKB up to a higher place. */
1323 }
1324 #else
1325 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1326 #define is_ip_over_ddp(skb) 0
1327 #define handle_ip_over_ddp(skb) 0
1328 #endif
1329
1330 static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1331 struct ddpehdr *ddp, __u16 len_hops, int origlen)
1332 {
1333 struct atalk_route *rt;
1334 struct atalk_addr ta;
1335
1336 /*
1337 * Don't route multicast, etc., packets, or packets sent to "this
1338 * network"
1339 */
1340 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1341 /*
1342 * FIXME:
1343 *
1344 * Can it ever happen that a packet is from a PPP iface and
1345 * needs to be broadcast onto the default network?
1346 */
1347 if (dev->type == ARPHRD_PPP)
1348 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1349 "packet received from PPP iface\n");
1350 goto free_it;
1351 }
1352
1353 ta.s_net = ddp->deh_dnet;
1354 ta.s_node = ddp->deh_dnode;
1355
1356 /* Route the packet */
1357 rt = atrtr_find(&ta);
1358 /* increment hops count */
1359 len_hops += 1 << 10;
1360 if (!rt || !(len_hops & (15 << 10)))
1361 goto free_it;
1362
1363 /* FIXME: use skb->cb to be able to use shared skbs */
1364
1365 /*
1366 * Route goes through another gateway, so set the target to the
1367 * gateway instead.
1368 */
1369
1370 if (rt->flags & RTF_GATEWAY) {
1371 ta.s_net = rt->gateway.s_net;
1372 ta.s_node = rt->gateway.s_node;
1373 }
1374
1375 /* Fix up skb->len field */
1376 skb_trim(skb, min_t(unsigned int, origlen,
1377 (rt->dev->hard_header_len +
1378 ddp_dl->header_length + (len_hops & 1023))));
1379
1380 /* FIXME: use skb->cb to be able to use shared skbs */
1381 ddp->deh_len_hops = htons(len_hops);
1382
1383 /*
1384 * Send the buffer onwards
1385 *
1386 * Now we must always be careful. If it's come from LocalTalk to
1387 * EtherTalk it might not fit
1388 *
1389 * Order matters here: If a packet has to be copied to make a new
1390 * headroom (rare hopefully) then it won't need unsharing.
1391 *
1392 * Note. ddp-> becomes invalid at the realloc.
1393 */
1394 if (skb_headroom(skb) < 22) {
1395 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1396 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1397 kfree_skb(skb);
1398 skb = nskb;
1399 } else
1400 skb = skb_unshare(skb, GFP_ATOMIC);
1401
1402 /*
1403 * If the buffer didn't vanish into the lack of space bitbucket we can
1404 * send it.
1405 */
1406 if (skb == NULL)
1407 goto drop;
1408
1409 if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
1410 return NET_RX_DROP;
1411 return NET_RX_SUCCESS;
1412 free_it:
1413 kfree_skb(skb);
1414 drop:
1415 return NET_RX_DROP;
1416 }
1417
1418 /**
1419 * atalk_rcv - Receive a packet (in skb) from device dev
1420 * @skb - packet received
1421 * @dev - network device where the packet comes from
1422 * @pt - packet type
1423 *
1424 * Receive a packet (in skb) from device dev. This has come from the SNAP
1425 * decoder, and on entry skb->transport_header is the DDP header, skb->len
1426 * is the DDP header, skb->len is the DDP length. The physical headers
1427 * have been extracted. PPP should probably pass frames marked as for this
1428 * layer. [ie ARPHRD_ETHERTALK]
1429 */
1430 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1431 struct packet_type *pt, struct net_device *orig_dev)
1432 {
1433 struct ddpehdr *ddp;
1434 struct sock *sock;
1435 struct atalk_iface *atif;
1436 struct sockaddr_at tosat;
1437 int origlen;
1438 __u16 len_hops;
1439
1440 if (!net_eq(dev_net(dev), &init_net))
1441 goto drop;
1442
1443 /* Don't mangle buffer if shared */
1444 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1445 goto out;
1446
1447 /* Size check and make sure header is contiguous */
1448 if (!pskb_may_pull(skb, sizeof(*ddp)))
1449 goto drop;
1450
1451 ddp = ddp_hdr(skb);
1452
1453 len_hops = ntohs(ddp->deh_len_hops);
1454
1455 /* Trim buffer in case of stray trailing data */
1456 origlen = skb->len;
1457 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1458
1459 /*
1460 * Size check to see if ddp->deh_len was crap
1461 * (Otherwise we'll detonate most spectacularly
1462 * in the middle of atalk_checksum() or recvmsg()).
1463 */
1464 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1465 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1466 "skb->len=%u)\n", len_hops & 1023, skb->len);
1467 goto drop;
1468 }
1469
1470 /*
1471 * Any checksums. Note we don't do htons() on this == is assumed to be
1472 * valid for net byte orders all over the networking code...
1473 */
1474 if (ddp->deh_sum &&
1475 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1476 /* Not a valid AppleTalk frame - dustbin time */
1477 goto drop;
1478
1479 /* Check the packet is aimed at us */
1480 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1481 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1482 else
1483 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1484
1485 if (!atif) {
1486 /* Not ours, so we route the packet via the correct
1487 * AppleTalk iface
1488 */
1489 return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1490 }
1491
1492 /* if IP over DDP is not selected this code will be optimized out */
1493 if (is_ip_over_ddp(skb))
1494 return handle_ip_over_ddp(skb);
1495 /*
1496 * Which socket - atalk_search_socket() looks for a *full match*
1497 * of the <net, node, port> tuple.
1498 */
1499 tosat.sat_addr.s_net = ddp->deh_dnet;
1500 tosat.sat_addr.s_node = ddp->deh_dnode;
1501 tosat.sat_port = ddp->deh_dport;
1502
1503 sock = atalk_search_socket(&tosat, atif);
1504 if (!sock) /* But not one of our sockets */
1505 goto drop;
1506
1507 /* Queue packet (standard) */
1508 skb->sk = sock;
1509
1510 if (sock_queue_rcv_skb(sock, skb) < 0)
1511 goto drop;
1512
1513 return NET_RX_SUCCESS;
1514
1515 drop:
1516 kfree_skb(skb);
1517 out:
1518 return NET_RX_DROP;
1519
1520 }
1521
1522 /*
1523 * Receive a LocalTalk frame. We make some demands on the caller here.
1524 * Caller must provide enough headroom on the packet to pull the short
1525 * header and append a long one.
1526 */
1527 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1528 struct packet_type *pt, struct net_device *orig_dev)
1529 {
1530 if (!net_eq(dev_net(dev), &init_net))
1531 goto freeit;
1532
1533 /* Expand any short form frames */
1534 if (skb_mac_header(skb)[2] == 1) {
1535 struct ddpehdr *ddp;
1536 /* Find our address */
1537 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1538
1539 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1540 goto freeit;
1541
1542 /* Don't mangle buffer if shared */
1543 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1544 return 0;
1545
1546 /*
1547 * The push leaves us with a ddephdr not an shdr, and
1548 * handily the port bytes in the right place preset.
1549 */
1550 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1551
1552 /* Now fill in the long header */
1553
1554 /*
1555 * These two first. The mac overlays the new source/dest
1556 * network information so we MUST copy these before
1557 * we write the network numbers !
1558 */
1559
1560 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1561 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
1562
1563 ddp->deh_dnet = ap->s_net; /* Network number */
1564 ddp->deh_snet = ap->s_net;
1565 ddp->deh_sum = 0; /* No checksum */
1566 /*
1567 * Not sure about this bit...
1568 */
1569 /* Non routable, so force a drop if we slip up later */
1570 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1571 }
1572 skb_reset_transport_header(skb);
1573
1574 return atalk_rcv(skb, dev, pt, orig_dev);
1575 freeit:
1576 kfree_skb(skb);
1577 return 0;
1578 }
1579
1580 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1581 size_t len)
1582 {
1583 struct sock *sk = sock->sk;
1584 struct atalk_sock *at = at_sk(sk);
1585 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1586 int flags = msg->msg_flags;
1587 int loopback = 0;
1588 struct sockaddr_at local_satalk, gsat;
1589 struct sk_buff *skb;
1590 struct net_device *dev;
1591 struct ddpehdr *ddp;
1592 int size;
1593 struct atalk_route *rt;
1594 int err;
1595
1596 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1597 return -EINVAL;
1598
1599 if (len > DDP_MAXSZ)
1600 return -EMSGSIZE;
1601
1602 lock_kernel();
1603 if (usat) {
1604 err = -EBUSY;
1605 if (sock_flag(sk, SOCK_ZAPPED))
1606 if (atalk_autobind(sk) < 0)
1607 goto out;
1608
1609 err = -EINVAL;
1610 if (msg->msg_namelen < sizeof(*usat) ||
1611 usat->sat_family != AF_APPLETALK)
1612 goto out;
1613
1614 err = -EPERM;
1615 /* netatalk didn't implement this check */
1616 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1617 !sock_flag(sk, SOCK_BROADCAST)) {
1618 goto out;
1619 }
1620 } else {
1621 err = -ENOTCONN;
1622 if (sk->sk_state != TCP_ESTABLISHED)
1623 goto out;
1624 usat = &local_satalk;
1625 usat->sat_family = AF_APPLETALK;
1626 usat->sat_port = at->dest_port;
1627 usat->sat_addr.s_node = at->dest_node;
1628 usat->sat_addr.s_net = at->dest_net;
1629 }
1630
1631 /* Build a packet */
1632 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1633
1634 /* For headers */
1635 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1636
1637 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1638 rt = atrtr_find(&usat->sat_addr);
1639 } else {
1640 struct atalk_addr at_hint;
1641
1642 at_hint.s_node = 0;
1643 at_hint.s_net = at->src_net;
1644
1645 rt = atrtr_find(&at_hint);
1646 }
1647 err = ENETUNREACH;
1648 if (!rt)
1649 goto out;
1650
1651 dev = rt->dev;
1652
1653 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1654 sk, size, dev->name);
1655
1656 size += dev->hard_header_len;
1657 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1658 if (!skb)
1659 goto out;
1660
1661 skb->sk = sk;
1662 skb_reserve(skb, ddp_dl->header_length);
1663 skb_reserve(skb, dev->hard_header_len);
1664 skb->dev = dev;
1665
1666 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1667
1668 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1669 ddp->deh_len_hops = htons(len + sizeof(*ddp));
1670 ddp->deh_dnet = usat->sat_addr.s_net;
1671 ddp->deh_snet = at->src_net;
1672 ddp->deh_dnode = usat->sat_addr.s_node;
1673 ddp->deh_snode = at->src_node;
1674 ddp->deh_dport = usat->sat_port;
1675 ddp->deh_sport = at->src_port;
1676
1677 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1678
1679 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1680 if (err) {
1681 kfree_skb(skb);
1682 err = -EFAULT;
1683 goto out;
1684 }
1685
1686 if (sk->sk_no_check == 1)
1687 ddp->deh_sum = 0;
1688 else
1689 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1690
1691 /*
1692 * Loopback broadcast packets to non gateway targets (ie routes
1693 * to group we are in)
1694 */
1695 if (ddp->deh_dnode == ATADDR_BCAST &&
1696 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1697 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1698
1699 if (skb2) {
1700 loopback = 1;
1701 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1702 /*
1703 * If it fails it is queued/sent above in the aarp queue
1704 */
1705 aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
1706 }
1707 }
1708
1709 if (dev->flags & IFF_LOOPBACK || loopback) {
1710 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1711 /* loop back */
1712 skb_orphan(skb);
1713 if (ddp->deh_dnode == ATADDR_BCAST) {
1714 struct atalk_addr at_lo;
1715
1716 at_lo.s_node = 0;
1717 at_lo.s_net = 0;
1718
1719 rt = atrtr_find(&at_lo);
1720 if (!rt) {
1721 kfree_skb(skb);
1722 err = -ENETUNREACH;
1723 goto out;
1724 }
1725 dev = rt->dev;
1726 skb->dev = dev;
1727 }
1728 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1729 } else {
1730 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1731 if (rt->flags & RTF_GATEWAY) {
1732 gsat.sat_addr = rt->gateway;
1733 usat = &gsat;
1734 }
1735
1736 /*
1737 * If it fails it is queued/sent above in the aarp queue
1738 */
1739 aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
1740 }
1741 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1742
1743 out:
1744 unlock_kernel();
1745 return err ? : len;
1746 }
1747
1748 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1749 size_t size, int flags)
1750 {
1751 struct sock *sk = sock->sk;
1752 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1753 struct ddpehdr *ddp;
1754 int copied = 0;
1755 int offset = 0;
1756 int err = 0;
1757 struct sk_buff *skb;
1758
1759 lock_kernel();
1760 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1761 flags & MSG_DONTWAIT, &err);
1762 if (!skb)
1763 goto out;
1764
1765 /* FIXME: use skb->cb to be able to use shared skbs */
1766 ddp = ddp_hdr(skb);
1767 copied = ntohs(ddp->deh_len_hops) & 1023;
1768
1769 if (sk->sk_type != SOCK_RAW) {
1770 offset = sizeof(*ddp);
1771 copied -= offset;
1772 }
1773
1774 if (copied > size) {
1775 copied = size;
1776 msg->msg_flags |= MSG_TRUNC;
1777 }
1778 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1779
1780 if (!err) {
1781 if (sat) {
1782 sat->sat_family = AF_APPLETALK;
1783 sat->sat_port = ddp->deh_sport;
1784 sat->sat_addr.s_node = ddp->deh_snode;
1785 sat->sat_addr.s_net = ddp->deh_snet;
1786 }
1787 msg->msg_namelen = sizeof(*sat);
1788 }
1789
1790 skb_free_datagram(sk, skb); /* Free the datagram. */
1791
1792 out:
1793 unlock_kernel();
1794 return err ? : copied;
1795 }
1796
1797
1798 /*
1799 * AppleTalk ioctl calls.
1800 */
1801 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1802 {
1803 int rc = -ENOIOCTLCMD;
1804 struct sock *sk = sock->sk;
1805 void __user *argp = (void __user *)arg;
1806
1807 switch (cmd) {
1808 /* Protocol layer */
1809 case TIOCOUTQ: {
1810 long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1811
1812 if (amount < 0)
1813 amount = 0;
1814 rc = put_user(amount, (int __user *)argp);
1815 break;
1816 }
1817 case TIOCINQ: {
1818 /*
1819 * These two are safe on a single CPU system as only
1820 * user tasks fiddle here
1821 */
1822 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1823 long amount = 0;
1824
1825 if (skb)
1826 amount = skb->len - sizeof(struct ddpehdr);
1827 rc = put_user(amount, (int __user *)argp);
1828 break;
1829 }
1830 case SIOCGSTAMP:
1831 rc = sock_get_timestamp(sk, argp);
1832 break;
1833 case SIOCGSTAMPNS:
1834 rc = sock_get_timestampns(sk, argp);
1835 break;
1836 /* Routing */
1837 case SIOCADDRT:
1838 case SIOCDELRT:
1839 rc = -EPERM;
1840 if (capable(CAP_NET_ADMIN))
1841 rc = atrtr_ioctl(cmd, argp);
1842 break;
1843 /* Interface */
1844 case SIOCGIFADDR:
1845 case SIOCSIFADDR:
1846 case SIOCGIFBRDADDR:
1847 case SIOCATALKDIFADDR:
1848 case SIOCDIFADDR:
1849 case SIOCSARP: /* proxy AARP */
1850 case SIOCDARP: /* proxy AARP */
1851 rtnl_lock();
1852 rc = atif_ioctl(cmd, argp);
1853 rtnl_unlock();
1854 break;
1855 }
1856
1857 return rc;
1858 }
1859
1860
1861 #ifdef CONFIG_COMPAT
1862 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1863 {
1864 /*
1865 * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
1866 * cannot handle it in common code. The data we access if ifreq
1867 * here is compatible, so we can simply call the native
1868 * handler.
1869 */
1870 if (cmd == SIOCATALKDIFADDR)
1871 return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1872
1873 return -ENOIOCTLCMD;
1874 }
1875 #endif
1876
1877
1878 static const struct net_proto_family atalk_family_ops = {
1879 .family = PF_APPLETALK,
1880 .create = atalk_create,
1881 .owner = THIS_MODULE,
1882 };
1883
1884 static const struct proto_ops atalk_dgram_ops = {
1885 .family = PF_APPLETALK,
1886 .owner = THIS_MODULE,
1887 .release = atalk_release,
1888 .bind = atalk_bind,
1889 .connect = atalk_connect,
1890 .socketpair = sock_no_socketpair,
1891 .accept = sock_no_accept,
1892 .getname = atalk_getname,
1893 .poll = atalk_poll,
1894 .ioctl = atalk_ioctl,
1895 #ifdef CONFIG_COMPAT
1896 .compat_ioctl = atalk_compat_ioctl,
1897 #endif
1898 .listen = sock_no_listen,
1899 .shutdown = sock_no_shutdown,
1900 .setsockopt = sock_no_setsockopt,
1901 .getsockopt = sock_no_getsockopt,
1902 .sendmsg = atalk_sendmsg,
1903 .recvmsg = atalk_recvmsg,
1904 .mmap = sock_no_mmap,
1905 .sendpage = sock_no_sendpage,
1906 };
1907
1908 static struct notifier_block ddp_notifier = {
1909 .notifier_call = ddp_device_event,
1910 };
1911
1912 static struct packet_type ltalk_packet_type __read_mostly = {
1913 .type = cpu_to_be16(ETH_P_LOCALTALK),
1914 .func = ltalk_rcv,
1915 };
1916
1917 static struct packet_type ppptalk_packet_type __read_mostly = {
1918 .type = cpu_to_be16(ETH_P_PPPTALK),
1919 .func = atalk_rcv,
1920 };
1921
1922 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1923
1924 /* Export symbols for use by drivers when AppleTalk is a module */
1925 EXPORT_SYMBOL(atrtr_get_dev);
1926 EXPORT_SYMBOL(atalk_find_dev_addr);
1927
1928 static const char atalk_err_snap[] __initconst =
1929 KERN_CRIT "Unable to register DDP with SNAP.\n";
1930
1931 /* Called by proto.c on kernel start up */
1932 static int __init atalk_init(void)
1933 {
1934 int rc = proto_register(&ddp_proto, 0);
1935
1936 if (rc != 0)
1937 goto out;
1938
1939 (void)sock_register(&atalk_family_ops);
1940 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1941 if (!ddp_dl)
1942 printk(atalk_err_snap);
1943
1944 dev_add_pack(&ltalk_packet_type);
1945 dev_add_pack(&ppptalk_packet_type);
1946
1947 register_netdevice_notifier(&ddp_notifier);
1948 aarp_proto_init();
1949 atalk_proc_init();
1950 atalk_register_sysctl();
1951 out:
1952 return rc;
1953 }
1954 module_init(atalk_init);
1955
1956 /*
1957 * No explicit module reference count manipulation is needed in the
1958 * protocol. Socket layer sets module reference count for us
1959 * and interfaces reference counting is done
1960 * by the network device layer.
1961 *
1962 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1963 * sockets be closed from user space.
1964 */
1965 static void __exit atalk_exit(void)
1966 {
1967 #ifdef CONFIG_SYSCTL
1968 atalk_unregister_sysctl();
1969 #endif /* CONFIG_SYSCTL */
1970 atalk_proc_exit();
1971 aarp_cleanup_module(); /* General aarp clean-up. */
1972 unregister_netdevice_notifier(&ddp_notifier);
1973 dev_remove_pack(&ltalk_packet_type);
1974 dev_remove_pack(&ppptalk_packet_type);
1975 unregister_snap_client(ddp_dl);
1976 sock_unregister(PF_APPLETALK);
1977 proto_unregister(&ddp_proto);
1978 }
1979 module_exit(atalk_exit);
1980
1981 MODULE_LICENSE("GPL");
1982 MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
1983 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1984 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
Linux kernel - Deliverables
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