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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / net / appletalk / ddp.c
blob876dbac71060860956f2e939c81efe2b91512775
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/config.h>
55 #include <linux/module.h>
56 #include <linux/tcp.h>
57 #include <linux/if_arp.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/route.h>
63 #include <linux/atalk.h>
64
65 struct datalink_proto *ddp_dl, *aarp_dl;
66 static struct proto_ops atalk_dgram_ops;
67
68 /**************************************************************************\
69 * *
70 * Handlers for the socket list. *
71 * *
72 \**************************************************************************/
73
74 HLIST_HEAD(atalk_sockets);
75 DEFINE_RWLOCK(atalk_sockets_lock);
76
77 static inline void __atalk_insert_socket(struct sock *sk)
78 {
79 sk_add_node(sk, &atalk_sockets);
80 }
81
82 static inline void atalk_remove_socket(struct sock *sk)
83 {
84 write_lock_bh(&atalk_sockets_lock);
85 sk_del_node_init(sk);
86 write_unlock_bh(&atalk_sockets_lock);
87 }
88
89 static struct sock *atalk_search_socket(struct sockaddr_at *to,
90 struct atalk_iface *atif)
91 {
92 struct sock *s;
93 struct hlist_node *node;
94
95 read_lock_bh(&atalk_sockets_lock);
96 sk_for_each(s, node, &atalk_sockets) {
97 struct atalk_sock *at = at_sk(s);
98
99 if (to->sat_port != at->src_port)
100 continue;
101
102 if (to->sat_addr.s_net == ATADDR_ANYNET &&
103 to->sat_addr.s_node == ATADDR_BCAST &&
104 at->src_net == atif->address.s_net)
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 = kmalloc(sizeof(*iface), GFP_KERNEL);
232
233 if (!iface)
234 goto out;
235
236 memset(iface, 0, sizeof(*iface));
237 dev_hold(dev);
238 iface->dev = dev;
239 dev->atalk_ptr = iface;
240 iface->address = *sa;
241 iface->status = 0;
242
243 write_lock_bh(&atalk_interfaces_lock);
244 iface->next = atalk_interfaces;
245 atalk_interfaces = iface;
246 write_unlock_bh(&atalk_interfaces_lock);
247 out:
248 return iface;
249 }
250
251 /* Perform phase 2 AARP probing on our tentative address */
252 static int atif_probe_device(struct atalk_iface *atif)
253 {
254 int netrange = ntohs(atif->nets.nr_lastnet) -
255 ntohs(atif->nets.nr_firstnet) + 1;
256 int probe_net = ntohs(atif->address.s_net);
257 int probe_node = atif->address.s_node;
258 int netct, nodect;
259
260 /* Offset the network we start probing with */
261 if (probe_net == ATADDR_ANYNET) {
262 probe_net = ntohs(atif->nets.nr_firstnet);
263 if (netrange)
264 probe_net += jiffies % netrange;
265 }
266 if (probe_node == ATADDR_ANYNODE)
267 probe_node = jiffies & 0xFF;
268
269 /* Scan the networks */
270 atif->status |= ATIF_PROBE;
271 for (netct = 0; netct <= netrange; netct++) {
272 /* Sweep the available nodes from a given start */
273 atif->address.s_net = htons(probe_net);
274 for (nodect = 0; nodect < 256; nodect++) {
275 atif->address.s_node = (nodect + probe_node) & 0xFF;
276 if (atif->address.s_node > 0 &&
277 atif->address.s_node < 254) {
278 /* Probe a proposed address */
279 aarp_probe_network(atif);
280
281 if (!(atif->status & ATIF_PROBE_FAIL)) {
282 atif->status &= ~ATIF_PROBE;
283 return 0;
284 }
285 }
286 atif->status &= ~ATIF_PROBE_FAIL;
287 }
288 probe_net++;
289 if (probe_net > ntohs(atif->nets.nr_lastnet))
290 probe_net = ntohs(atif->nets.nr_firstnet);
291 }
292 atif->status &= ~ATIF_PROBE;
293
294 return -EADDRINUSE; /* Network is full... */
295 }
296
297
298 /* Perform AARP probing for a proxy address */
299 static int atif_proxy_probe_device(struct atalk_iface *atif,
300 struct atalk_addr* proxy_addr)
301 {
302 int netrange = ntohs(atif->nets.nr_lastnet) -
303 ntohs(atif->nets.nr_firstnet) + 1;
304 /* we probe the interface's network */
305 int probe_net = ntohs(atif->address.s_net);
306 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
307 int netct, nodect;
308
309 /* Offset the network we start probing with */
310 if (probe_net == ATADDR_ANYNET) {
311 probe_net = ntohs(atif->nets.nr_firstnet);
312 if (netrange)
313 probe_net += jiffies % netrange;
314 }
315
316 if (probe_node == ATADDR_ANYNODE)
317 probe_node = jiffies & 0xFF;
318
319 /* Scan the networks */
320 for (netct = 0; netct <= netrange; netct++) {
321 /* Sweep the available nodes from a given start */
322 proxy_addr->s_net = htons(probe_net);
323 for (nodect = 0; nodect < 256; nodect++) {
324 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
325 if (proxy_addr->s_node > 0 &&
326 proxy_addr->s_node < 254) {
327 /* Tell AARP to probe a proposed address */
328 int ret = aarp_proxy_probe_network(atif,
329 proxy_addr);
330
331 if (ret != -EADDRINUSE)
332 return ret;
333 }
334 }
335 probe_net++;
336 if (probe_net > ntohs(atif->nets.nr_lastnet))
337 probe_net = ntohs(atif->nets.nr_firstnet);
338 }
339
340 return -EADDRINUSE; /* Network is full... */
341 }
342
343
344 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
345 {
346 struct atalk_iface *iface = dev->atalk_ptr;
347 return iface ? &iface->address : NULL;
348 }
349
350 static struct atalk_addr *atalk_find_primary(void)
351 {
352 struct atalk_iface *fiface = NULL;
353 struct atalk_addr *retval;
354 struct atalk_iface *iface;
355
356 /*
357 * Return a point-to-point interface only if
358 * there is no non-ptp interface available.
359 */
360 read_lock_bh(&atalk_interfaces_lock);
361 for (iface = atalk_interfaces; iface; iface = iface->next) {
362 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
363 fiface = iface;
364 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
365 retval = &iface->address;
366 goto out;
367 }
368 }
369
370 if (fiface)
371 retval = &fiface->address;
372 else if (atalk_interfaces)
373 retval = &atalk_interfaces->address;
374 else
375 retval = NULL;
376 out:
377 read_unlock_bh(&atalk_interfaces_lock);
378 return retval;
379 }
380
381 /*
382 * Find a match for 'any network' - ie any of our interfaces with that
383 * node number will do just nicely.
384 */
385 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
386 {
387 struct atalk_iface *iface = dev->atalk_ptr;
388
389 if (!iface || iface->status & ATIF_PROBE)
390 goto out_err;
391
392 if (node != ATADDR_BCAST &&
393 iface->address.s_node != node &&
394 node != ATADDR_ANYNODE)
395 goto out_err;
396 out:
397 return iface;
398 out_err:
399 iface = NULL;
400 goto out;
401 }
402
403 /* Find a match for a specific network:node pair */
404 static struct atalk_iface *atalk_find_interface(int net, int node)
405 {
406 struct atalk_iface *iface;
407
408 read_lock_bh(&atalk_interfaces_lock);
409 for (iface = atalk_interfaces; iface; iface = iface->next) {
410 if ((node == ATADDR_BCAST ||
411 node == ATADDR_ANYNODE ||
412 iface->address.s_node == node) &&
413 iface->address.s_net == net &&
414 !(iface->status & ATIF_PROBE))
415 break;
416
417 /* XXXX.0 -- net.0 returns the iface associated with net */
418 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
419 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
420 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
421 break;
422 }
423 read_unlock_bh(&atalk_interfaces_lock);
424 return iface;
425 }
426
427
428 /*
429 * Find a route for an AppleTalk packet. This ought to get cached in
430 * the socket (later on...). We know about host routes and the fact
431 * that a route must be direct to broadcast.
432 */
433 static struct atalk_route *atrtr_find(struct atalk_addr *target)
434 {
435 /*
436 * we must search through all routes unless we find a
437 * host route, because some host routes might overlap
438 * network routes
439 */
440 struct atalk_route *net_route = NULL;
441 struct atalk_route *r;
442
443 read_lock_bh(&atalk_routes_lock);
444 for (r = atalk_routes; r; r = r->next) {
445 if (!(r->flags & RTF_UP))
446 continue;
447
448 if (r->target.s_net == target->s_net) {
449 if (r->flags & RTF_HOST) {
450 /*
451 * if this host route is for the target,
452 * the we're done
453 */
454 if (r->target.s_node == target->s_node)
455 goto out;
456 } else
457 /*
458 * this route will work if there isn't a
459 * direct host route, so cache it
460 */
461 net_route = r;
462 }
463 }
464
465 /*
466 * if we found a network route but not a direct host
467 * route, then return it
468 */
469 if (net_route)
470 r = net_route;
471 else if (atrtr_default.dev)
472 r = &atrtr_default;
473 else /* No route can be found */
474 r = NULL;
475 out:
476 read_unlock_bh(&atalk_routes_lock);
477 return r;
478 }
479
480
481 /*
482 * Given an AppleTalk network, find the device to use. This can be
483 * a simple lookup.
484 */
485 struct net_device *atrtr_get_dev(struct atalk_addr *sa)
486 {
487 struct atalk_route *atr = atrtr_find(sa);
488 return atr ? atr->dev : NULL;
489 }
490
491 /* Set up a default router */
492 static void atrtr_set_default(struct net_device *dev)
493 {
494 atrtr_default.dev = dev;
495 atrtr_default.flags = RTF_UP;
496 atrtr_default.gateway.s_net = htons(0);
497 atrtr_default.gateway.s_node = 0;
498 }
499
500 /*
501 * Add a router. Basically make sure it looks valid and stuff the
502 * entry in the list. While it uses netranges we always set them to one
503 * entry to work like netatalk.
504 */
505 static int atrtr_create(struct rtentry *r, struct net_device *devhint)
506 {
507 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
508 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
509 struct atalk_route *rt;
510 struct atalk_iface *iface, *riface;
511 int retval = -EINVAL;
512
513 /*
514 * Fixme: Raise/Lower a routing change semaphore for these
515 * operations.
516 */
517
518 /* Validate the request */
519 if (ta->sat_family != AF_APPLETALK ||
520 (!devhint && ga->sat_family != AF_APPLETALK))
521 goto out;
522
523 /* Now walk the routing table and make our decisions */
524 write_lock_bh(&atalk_routes_lock);
525 for (rt = atalk_routes; rt; rt = rt->next) {
526 if (r->rt_flags != rt->flags)
527 continue;
528
529 if (ta->sat_addr.s_net == rt->target.s_net) {
530 if (!(rt->flags & RTF_HOST))
531 break;
532 if (ta->sat_addr.s_node == rt->target.s_node)
533 break;
534 }
535 }
536
537 if (!devhint) {
538 riface = NULL;
539
540 read_lock_bh(&atalk_interfaces_lock);
541 for (iface = atalk_interfaces; iface; iface = iface->next) {
542 if (!riface &&
543 ntohs(ga->sat_addr.s_net) >=
544 ntohs(iface->nets.nr_firstnet) &&
545 ntohs(ga->sat_addr.s_net) <=
546 ntohs(iface->nets.nr_lastnet))
547 riface = iface;
548
549 if (ga->sat_addr.s_net == iface->address.s_net &&
550 ga->sat_addr.s_node == iface->address.s_node)
551 riface = iface;
552 }
553 read_unlock_bh(&atalk_interfaces_lock);
554
555 retval = -ENETUNREACH;
556 if (!riface)
557 goto out_unlock;
558
559 devhint = riface->dev;
560 }
561
562 if (!rt) {
563 rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
564
565 retval = -ENOBUFS;
566 if (!rt)
567 goto out_unlock;
568 memset(rt, 0, sizeof(*rt));
569
570 rt->next = atalk_routes;
571 atalk_routes = rt;
572 }
573
574 /* Fill in the routing entry */
575 rt->target = ta->sat_addr;
576 dev_hold(devhint);
577 rt->dev = devhint;
578 rt->flags = r->rt_flags;
579 rt->gateway = ga->sat_addr;
580
581 retval = 0;
582 out_unlock:
583 write_unlock_bh(&atalk_routes_lock);
584 out:
585 return retval;
586 }
587
588 /* Delete a route. Find it and discard it */
589 static int atrtr_delete(struct atalk_addr * addr)
590 {
591 struct atalk_route **r = &atalk_routes;
592 int retval = 0;
593 struct atalk_route *tmp;
594
595 write_lock_bh(&atalk_routes_lock);
596 while ((tmp = *r) != NULL) {
597 if (tmp->target.s_net == addr->s_net &&
598 (!(tmp->flags&RTF_GATEWAY) ||
599 tmp->target.s_node == addr->s_node)) {
600 *r = tmp->next;
601 dev_put(tmp->dev);
602 kfree(tmp);
603 goto out;
604 }
605 r = &tmp->next;
606 }
607 retval = -ENOENT;
608 out:
609 write_unlock_bh(&atalk_routes_lock);
610 return retval;
611 }
612
613 /*
614 * Called when a device is downed. Just throw away any routes
615 * via it.
616 */
617 static void atrtr_device_down(struct net_device *dev)
618 {
619 struct atalk_route **r = &atalk_routes;
620 struct atalk_route *tmp;
621
622 write_lock_bh(&atalk_routes_lock);
623 while ((tmp = *r) != NULL) {
624 if (tmp->dev == dev) {
625 *r = tmp->next;
626 dev_put(dev);
627 kfree(tmp);
628 } else
629 r = &tmp->next;
630 }
631 write_unlock_bh(&atalk_routes_lock);
632
633 if (atrtr_default.dev == dev)
634 atrtr_set_default(NULL);
635 }
636
637 /* Actually down the interface */
638 static inline void atalk_dev_down(struct net_device *dev)
639 {
640 atrtr_device_down(dev); /* Remove all routes for the device */
641 aarp_device_down(dev); /* Remove AARP entries for the device */
642 atif_drop_device(dev); /* Remove the device */
643 }
644
645 /*
646 * A device event has occurred. Watch for devices going down and
647 * delete our use of them (iface and route).
648 */
649 static int ddp_device_event(struct notifier_block *this, unsigned long event,
650 void *ptr)
651 {
652 if (event == NETDEV_DOWN)
653 /* Discard any use of this */
654 atalk_dev_down(ptr);
655
656 return NOTIFY_DONE;
657 }
658
659 /* ioctl calls. Shouldn't even need touching */
660 /* Device configuration ioctl calls */
661 static int atif_ioctl(int cmd, void __user *arg)
662 {
663 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
664 struct ifreq atreq;
665 struct atalk_netrange *nr;
666 struct sockaddr_at *sa;
667 struct net_device *dev;
668 struct atalk_iface *atif;
669 int ct;
670 int limit;
671 struct rtentry rtdef;
672 int add_route;
673
674 if (copy_from_user(&atreq, arg, sizeof(atreq)))
675 return -EFAULT;
676
677 dev = __dev_get_by_name(atreq.ifr_name);
678 if (!dev)
679 return -ENODEV;
680
681 sa = (struct sockaddr_at *)&atreq.ifr_addr;
682 atif = atalk_find_dev(dev);
683
684 switch (cmd) {
685 case SIOCSIFADDR:
686 if (!capable(CAP_NET_ADMIN))
687 return -EPERM;
688 if (sa->sat_family != AF_APPLETALK)
689 return -EINVAL;
690 if (dev->type != ARPHRD_ETHER &&
691 dev->type != ARPHRD_LOOPBACK &&
692 dev->type != ARPHRD_LOCALTLK &&
693 dev->type != ARPHRD_PPP)
694 return -EPROTONOSUPPORT;
695
696 nr = (struct atalk_netrange *)&sa->sat_zero[0];
697 add_route = 1;
698
699 /*
700 * if this is a point-to-point iface, and we already
701 * have an iface for this AppleTalk address, then we
702 * should not add a route
703 */
704 if ((dev->flags & IFF_POINTOPOINT) &&
705 atalk_find_interface(sa->sat_addr.s_net,
706 sa->sat_addr.s_node)) {
707 printk(KERN_DEBUG "AppleTalk: point-to-point "
708 "interface added with "
709 "existing address\n");
710 add_route = 0;
711 }
712
713 /*
714 * Phase 1 is fine on LocalTalk but we don't do
715 * EtherTalk phase 1. Anyone wanting to add it go ahead.
716 */
717 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
718 return -EPROTONOSUPPORT;
719 if (sa->sat_addr.s_node == ATADDR_BCAST ||
720 sa->sat_addr.s_node == 254)
721 return -EINVAL;
722 if (atif) {
723 /* Already setting address */
724 if (atif->status & ATIF_PROBE)
725 return -EBUSY;
726
727 atif->address.s_net = sa->sat_addr.s_net;
728 atif->address.s_node = sa->sat_addr.s_node;
729 atrtr_device_down(dev); /* Flush old routes */
730 } else {
731 atif = atif_add_device(dev, &sa->sat_addr);
732 if (!atif)
733 return -ENOMEM;
734 }
735 atif->nets = *nr;
736
737 /*
738 * Check if the chosen address is used. If so we
739 * error and atalkd will try another.
740 */
741
742 if (!(dev->flags & IFF_LOOPBACK) &&
743 !(dev->flags & IFF_POINTOPOINT) &&
744 atif_probe_device(atif) < 0) {
745 atif_drop_device(dev);
746 return -EADDRINUSE;
747 }
748
749 /* Hey it worked - add the direct routes */
750 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
751 sa->sat_family = AF_APPLETALK;
752 sa->sat_addr.s_net = atif->address.s_net;
753 sa->sat_addr.s_node = atif->address.s_node;
754 sa = (struct sockaddr_at *)&rtdef.rt_dst;
755 rtdef.rt_flags = RTF_UP;
756 sa->sat_family = AF_APPLETALK;
757 sa->sat_addr.s_node = ATADDR_ANYNODE;
758 if (dev->flags & IFF_LOOPBACK ||
759 dev->flags & IFF_POINTOPOINT)
760 rtdef.rt_flags |= RTF_HOST;
761
762 /* Routerless initial state */
763 if (nr->nr_firstnet == htons(0) &&
764 nr->nr_lastnet == htons(0xFFFE)) {
765 sa->sat_addr.s_net = atif->address.s_net;
766 atrtr_create(&rtdef, dev);
767 atrtr_set_default(dev);
768 } else {
769 limit = ntohs(nr->nr_lastnet);
770 if (limit - ntohs(nr->nr_firstnet) > 4096) {
771 printk(KERN_WARNING "Too many routes/"
772 "iface.\n");
773 return -EINVAL;
774 }
775 if (add_route)
776 for (ct = ntohs(nr->nr_firstnet);
777 ct <= limit; ct++) {
778 sa->sat_addr.s_net = htons(ct);
779 atrtr_create(&rtdef, dev);
780 }
781 }
782 dev_mc_add(dev, aarp_mcast, 6, 1);
783 return 0;
784
785 case SIOCGIFADDR:
786 if (!atif)
787 return -EADDRNOTAVAIL;
788
789 sa->sat_family = AF_APPLETALK;
790 sa->sat_addr = atif->address;
791 break;
792
793 case SIOCGIFBRDADDR:
794 if (!atif)
795 return -EADDRNOTAVAIL;
796
797 sa->sat_family = AF_APPLETALK;
798 sa->sat_addr.s_net = atif->address.s_net;
799 sa->sat_addr.s_node = ATADDR_BCAST;
800 break;
801
802 case SIOCATALKDIFADDR:
803 case SIOCDIFADDR:
804 if (!capable(CAP_NET_ADMIN))
805 return -EPERM;
806 if (sa->sat_family != AF_APPLETALK)
807 return -EINVAL;
808 atalk_dev_down(dev);
809 break;
810
811 case SIOCSARP:
812 if (!capable(CAP_NET_ADMIN))
813 return -EPERM;
814 if (sa->sat_family != AF_APPLETALK)
815 return -EINVAL;
816 if (!atif)
817 return -EADDRNOTAVAIL;
818
819 /*
820 * for now, we only support proxy AARP on ELAP;
821 * we should be able to do it for LocalTalk, too.
822 */
823 if (dev->type != ARPHRD_ETHER)
824 return -EPROTONOSUPPORT;
825
826 /*
827 * atif points to the current interface on this network;
828 * we aren't concerned about its current status (at
829 * least for now), but it has all the settings about
830 * the network we're going to probe. Consequently, it
831 * must exist.
832 */
833 if (!atif)
834 return -EADDRNOTAVAIL;
835
836 nr = (struct atalk_netrange *)&(atif->nets);
837 /*
838 * Phase 1 is fine on Localtalk but we don't do
839 * Ethertalk phase 1. Anyone wanting to add it go ahead.
840 */
841 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
842 return -EPROTONOSUPPORT;
843
844 if (sa->sat_addr.s_node == ATADDR_BCAST ||
845 sa->sat_addr.s_node == 254)
846 return -EINVAL;
847
848 /*
849 * Check if the chosen address is used. If so we
850 * error and ATCP will try another.
851 */
852 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
853 return -EADDRINUSE;
854
855 /*
856 * We now have an address on the local network, and
857 * the AARP code will defend it for us until we take it
858 * down. We don't set up any routes right now, because
859 * ATCP will install them manually via SIOCADDRT.
860 */
861 break;
862
863 case SIOCDARP:
864 if (!capable(CAP_NET_ADMIN))
865 return -EPERM;
866 if (sa->sat_family != AF_APPLETALK)
867 return -EINVAL;
868 if (!atif)
869 return -EADDRNOTAVAIL;
870
871 /* give to aarp module to remove proxy entry */
872 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
873 return 0;
874 }
875
876 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
877 }
878
879 /* Routing ioctl() calls */
880 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
881 {
882 struct rtentry rt;
883
884 if (copy_from_user(&rt, arg, sizeof(rt)))
885 return -EFAULT;
886
887 switch (cmd) {
888 case SIOCDELRT:
889 if (rt.rt_dst.sa_family != AF_APPLETALK)
890 return -EINVAL;
891 return atrtr_delete(&((struct sockaddr_at *)
892 &rt.rt_dst)->sat_addr);
893
894 case SIOCADDRT: {
895 struct net_device *dev = NULL;
896 if (rt.rt_dev) {
897 char name[IFNAMSIZ];
898 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
899 return -EFAULT;
900 name[IFNAMSIZ-1] = '\0';
901 dev = __dev_get_by_name(name);
902 if (!dev)
903 return -ENODEV;
904 }
905 return atrtr_create(&rt, dev);
906 }
907 }
908 return -EINVAL;
909 }
910
911 /**************************************************************************\
912 * *
913 * Handling for system calls applied via the various interfaces to an *
914 * AppleTalk socket object. *
915 * *
916 \**************************************************************************/
917
918 /*
919 * Checksum: This is 'optional'. It's quite likely also a good
920 * candidate for assembler hackery 8)
921 */
922 static unsigned long atalk_sum_partial(const unsigned char *data,
923 int len, unsigned long sum)
924 {
925 /* This ought to be unwrapped neatly. I'll trust gcc for now */
926 while (len--) {
927 sum += *data;
928 sum <<= 1;
929 if (sum & 0x10000) {
930 sum++;
931 sum &= 0xffff;
932 }
933 data++;
934 }
935 return sum;
936 }
937
938 /* Checksum skb data -- similar to skb_checksum */
939 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
940 int len, unsigned long sum)
941 {
942 int start = skb_headlen(skb);
943 int i, copy;
944
945 /* checksum stuff in header space */
946 if ( (copy = start - offset) > 0) {
947 if (copy > len)
948 copy = len;
949 sum = atalk_sum_partial(skb->data + offset, copy, sum);
950 if ( (len -= copy) == 0)
951 return sum;
952
953 offset += copy;
954 }
955
956 /* checksum stuff in frags */
957 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
958 int end;
959
960 BUG_TRAP(start <= offset + len);
961
962 end = start + skb_shinfo(skb)->frags[i].size;
963 if ((copy = end - offset) > 0) {
964 u8 *vaddr;
965 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
966
967 if (copy > len)
968 copy = len;
969 vaddr = kmap_skb_frag(frag);
970 sum = atalk_sum_partial(vaddr + frag->page_offset +
971 offset - start, copy, sum);
972 kunmap_skb_frag(vaddr);
973
974 if (!(len -= copy))
975 return sum;
976 offset += copy;
977 }
978 start = end;
979 }
980
981 if (skb_shinfo(skb)->frag_list) {
982 struct sk_buff *list = skb_shinfo(skb)->frag_list;
983
984 for (; list; list = list->next) {
985 int end;
986
987 BUG_TRAP(start <= offset + len);
988
989 end = start + list->len;
990 if ((copy = end - offset) > 0) {
991 if (copy > len)
992 copy = len;
993 sum = atalk_sum_skb(list, offset - start,
994 copy, sum);
995 if ((len -= copy) == 0)
996 return sum;
997 offset += copy;
998 }
999 start = end;
1000 }
1001 }
1002
1003 BUG_ON(len > 0);
1004
1005 return sum;
1006 }
1007
1008 static unsigned short atalk_checksum(const struct sk_buff *skb, int len)
1009 {
1010 unsigned long sum;
1011
1012 /* skip header 4 bytes */
1013 sum = atalk_sum_skb(skb, 4, len-4, 0);
1014
1015 /* Use 0xFFFF for 0. 0 itself means none */
1016 return sum ? htons((unsigned short)sum) : 0xFFFF;
1017 }
1018
1019 static struct proto ddp_proto = {
1020 .name = "DDP",
1021 .owner = THIS_MODULE,
1022 .obj_size = sizeof(struct atalk_sock),
1023 };
1024
1025 /*
1026 * Create a socket. Initialise the socket, blank the addresses
1027 * set the state.
1028 */
1029 static int atalk_create(struct socket *sock, int protocol)
1030 {
1031 struct sock *sk;
1032 int rc = -ESOCKTNOSUPPORT;
1033
1034 /*
1035 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1036 * and gives you the full ELAP frame. Should be handy for CAP 8)
1037 */
1038 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1039 goto out;
1040 rc = -ENOMEM;
1041 sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1);
1042 if (!sk)
1043 goto out;
1044 rc = 0;
1045 sock->ops = &atalk_dgram_ops;
1046 sock_init_data(sock, sk);
1047
1048 /* Checksums on by default */
1049 sock_set_flag(sk, SOCK_ZAPPED);
1050 out:
1051 return rc;
1052 }
1053
1054 /* Free a socket. No work needed */
1055 static int atalk_release(struct socket *sock)
1056 {
1057 struct sock *sk = sock->sk;
1058
1059 if (sk) {
1060 sock_orphan(sk);
1061 sock->sk = NULL;
1062 atalk_destroy_socket(sk);
1063 }
1064 return 0;
1065 }
1066
1067 /**
1068 * atalk_pick_and_bind_port - Pick a source port when one is not given
1069 * @sk - socket to insert into the tables
1070 * @sat - address to search for
1071 *
1072 * Pick a source port when one is not given. If we can find a suitable free
1073 * one, we insert the socket into the tables using it.
1074 *
1075 * This whole operation must be atomic.
1076 */
1077 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1078 {
1079 int retval;
1080
1081 write_lock_bh(&atalk_sockets_lock);
1082
1083 for (sat->sat_port = ATPORT_RESERVED;
1084 sat->sat_port < ATPORT_LAST;
1085 sat->sat_port++) {
1086 struct sock *s;
1087 struct hlist_node *node;
1088
1089 sk_for_each(s, node, &atalk_sockets) {
1090 struct atalk_sock *at = at_sk(s);
1091
1092 if (at->src_net == sat->sat_addr.s_net &&
1093 at->src_node == sat->sat_addr.s_node &&
1094 at->src_port == sat->sat_port)
1095 goto try_next_port;
1096 }
1097
1098 /* Wheee, it's free, assign and insert. */
1099 __atalk_insert_socket(sk);
1100 at_sk(sk)->src_port = sat->sat_port;
1101 retval = 0;
1102 goto out;
1103
1104 try_next_port:;
1105 }
1106
1107 retval = -EBUSY;
1108 out:
1109 write_unlock_bh(&atalk_sockets_lock);
1110 return retval;
1111 }
1112
1113 static int atalk_autobind(struct sock *sk)
1114 {
1115 struct atalk_sock *at = at_sk(sk);
1116 struct sockaddr_at sat;
1117 struct atalk_addr *ap = atalk_find_primary();
1118 int n = -EADDRNOTAVAIL;
1119
1120 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1121 goto out;
1122
1123 at->src_net = sat.sat_addr.s_net = ap->s_net;
1124 at->src_node = sat.sat_addr.s_node = ap->s_node;
1125
1126 n = atalk_pick_and_bind_port(sk, &sat);
1127 if (!n)
1128 sock_reset_flag(sk, SOCK_ZAPPED);
1129 out:
1130 return n;
1131 }
1132
1133 /* Set the address 'our end' of the connection */
1134 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1135 {
1136 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1137 struct sock *sk = sock->sk;
1138 struct atalk_sock *at = at_sk(sk);
1139
1140 if (!sock_flag(sk, SOCK_ZAPPED) ||
1141 addr_len != sizeof(struct sockaddr_at))
1142 return -EINVAL;
1143
1144 if (addr->sat_family != AF_APPLETALK)
1145 return -EAFNOSUPPORT;
1146
1147 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1148 struct atalk_addr *ap = atalk_find_primary();
1149
1150 if (!ap)
1151 return -EADDRNOTAVAIL;
1152
1153 at->src_net = addr->sat_addr.s_net = ap->s_net;
1154 at->src_node = addr->sat_addr.s_node= ap->s_node;
1155 } else {
1156 if (!atalk_find_interface(addr->sat_addr.s_net,
1157 addr->sat_addr.s_node))
1158 return -EADDRNOTAVAIL;
1159
1160 at->src_net = addr->sat_addr.s_net;
1161 at->src_node = addr->sat_addr.s_node;
1162 }
1163
1164 if (addr->sat_port == ATADDR_ANYPORT) {
1165 int n = atalk_pick_and_bind_port(sk, addr);
1166
1167 if (n < 0)
1168 return n;
1169 } else {
1170 at->src_port = addr->sat_port;
1171
1172 if (atalk_find_or_insert_socket(sk, addr))
1173 return -EADDRINUSE;
1174 }
1175
1176 sock_reset_flag(sk, SOCK_ZAPPED);
1177 return 0;
1178 }
1179
1180 /* Set the address we talk to */
1181 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1182 int addr_len, int flags)
1183 {
1184 struct sock *sk = sock->sk;
1185 struct atalk_sock *at = at_sk(sk);
1186 struct sockaddr_at *addr;
1187
1188 sk->sk_state = TCP_CLOSE;
1189 sock->state = SS_UNCONNECTED;
1190
1191 if (addr_len != sizeof(*addr))
1192 return -EINVAL;
1193
1194 addr = (struct sockaddr_at *)uaddr;
1195
1196 if (addr->sat_family != AF_APPLETALK)
1197 return -EAFNOSUPPORT;
1198
1199 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1200 !sock_flag(sk, SOCK_BROADCAST)) {
1201 #if 1
1202 printk(KERN_WARNING "%s is broken and did not set "
1203 "SO_BROADCAST. It will break when 2.2 is "
1204 "released.\n",
1205 current->comm);
1206 #else
1207 return -EACCES;
1208 #endif
1209 }
1210
1211 if (sock_flag(sk, SOCK_ZAPPED))
1212 if (atalk_autobind(sk) < 0)
1213 return -EBUSY;
1214
1215 if (!atrtr_get_dev(&addr->sat_addr))
1216 return -ENETUNREACH;
1217
1218 at->dest_port = addr->sat_port;
1219 at->dest_net = addr->sat_addr.s_net;
1220 at->dest_node = addr->sat_addr.s_node;
1221
1222 sock->state = SS_CONNECTED;
1223 sk->sk_state = TCP_ESTABLISHED;
1224 return 0;
1225 }
1226
1227 /*
1228 * Find the name of an AppleTalk socket. Just copy the right
1229 * fields into the sockaddr.
1230 */
1231 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1232 int *uaddr_len, int peer)
1233 {
1234 struct sockaddr_at sat;
1235 struct sock *sk = sock->sk;
1236 struct atalk_sock *at = at_sk(sk);
1237
1238 if (sock_flag(sk, SOCK_ZAPPED))
1239 if (atalk_autobind(sk) < 0)
1240 return -ENOBUFS;
1241
1242 *uaddr_len = sizeof(struct sockaddr_at);
1243
1244 if (peer) {
1245 if (sk->sk_state != TCP_ESTABLISHED)
1246 return -ENOTCONN;
1247
1248 sat.sat_addr.s_net = at->dest_net;
1249 sat.sat_addr.s_node = at->dest_node;
1250 sat.sat_port = at->dest_port;
1251 } else {
1252 sat.sat_addr.s_net = at->src_net;
1253 sat.sat_addr.s_node = at->src_node;
1254 sat.sat_port = at->src_port;
1255 }
1256
1257 sat.sat_family = AF_APPLETALK;
1258 memcpy(uaddr, &sat, sizeof(sat));
1259 return 0;
1260 }
1261
1262 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1263 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1264 {
1265 return skb->data[12] == 22;
1266 }
1267
1268 static int handle_ip_over_ddp(struct sk_buff *skb)
1269 {
1270 struct net_device *dev = __dev_get_by_name("ipddp0");
1271 struct net_device_stats *stats;
1272
1273 /* This needs to be able to handle ipddp"N" devices */
1274 if (!dev)
1275 return -ENODEV;
1276
1277 skb->protocol = htons(ETH_P_IP);
1278 skb_pull(skb, 13);
1279 skb->dev = dev;
1280 skb->h.raw = skb->data;
1281
1282 stats = dev->priv;
1283 stats->rx_packets++;
1284 stats->rx_bytes += skb->len + 13;
1285 netif_rx(skb); /* Send the SKB up to a higher place. */
1286 return 0;
1287 }
1288 #else
1289 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1290 #define is_ip_over_ddp(skb) 0
1291 #define handle_ip_over_ddp(skb) 0
1292 #endif
1293
1294 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1295 struct ddpehdr *ddp, struct ddpebits *ddphv,
1296 int origlen)
1297 {
1298 struct atalk_route *rt;
1299 struct atalk_addr ta;
1300
1301 /*
1302 * Don't route multicast, etc., packets, or packets sent to "this
1303 * network"
1304 */
1305 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1306 /*
1307 * FIXME:
1308 *
1309 * Can it ever happen that a packet is from a PPP iface and
1310 * needs to be broadcast onto the default network?
1311 */
1312 if (dev->type == ARPHRD_PPP)
1313 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1314 "packet received from PPP iface\n");
1315 goto free_it;
1316 }
1317
1318 ta.s_net = ddp->deh_dnet;
1319 ta.s_node = ddp->deh_dnode;
1320
1321 /* Route the packet */
1322 rt = atrtr_find(&ta);
1323 if (!rt || ddphv->deh_hops == DDP_MAXHOPS)
1324 goto free_it;
1325 /* FIXME: use skb->cb to be able to use shared skbs */
1326 ddphv->deh_hops++;
1327
1328 /*
1329 * Route goes through another gateway, so set the target to the
1330 * gateway instead.
1331 */
1332
1333 if (rt->flags & RTF_GATEWAY) {
1334 ta.s_net = rt->gateway.s_net;
1335 ta.s_node = rt->gateway.s_node;
1336 }
1337
1338 /* Fix up skb->len field */
1339 skb_trim(skb, min_t(unsigned int, origlen,
1340 (rt->dev->hard_header_len +
1341 ddp_dl->header_length + ddphv->deh_len)));
1342
1343 /* Mend the byte order */
1344 /* FIXME: use skb->cb to be able to use shared skbs */
1345 *((__u16 *)ddp) = ntohs(*((__u16 *)ddphv));
1346
1347 /*
1348 * Send the buffer onwards
1349 *
1350 * Now we must always be careful. If it's come from LocalTalk to
1351 * EtherTalk it might not fit
1352 *
1353 * Order matters here: If a packet has to be copied to make a new
1354 * headroom (rare hopefully) then it won't need unsharing.
1355 *
1356 * Note. ddp-> becomes invalid at the realloc.
1357 */
1358 if (skb_headroom(skb) < 22) {
1359 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1360 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1361 kfree_skb(skb);
1362 if (!nskb)
1363 goto out;
1364 skb = nskb;
1365 } else
1366 skb = skb_unshare(skb, GFP_ATOMIC);
1367
1368 /*
1369 * If the buffer didn't vanish into the lack of space bitbucket we can
1370 * send it.
1371 */
1372 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1373 goto free_it;
1374 out:
1375 return;
1376 free_it:
1377 kfree_skb(skb);
1378 }
1379
1380 /**
1381 * atalk_rcv - Receive a packet (in skb) from device dev
1382 * @skb - packet received
1383 * @dev - network device where the packet comes from
1384 * @pt - packet type
1385 *
1386 * Receive a packet (in skb) from device dev. This has come from the SNAP
1387 * decoder, and on entry skb->h.raw is the DDP header, skb->len is the DDP
1388 * header, skb->len is the DDP length. The physical headers have been
1389 * extracted. PPP should probably pass frames marked as for this layer.
1390 * [ie ARPHRD_ETHERTALK]
1391 */
1392 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1393 struct packet_type *pt)
1394 {
1395 struct ddpehdr *ddp;
1396 struct sock *sock;
1397 struct atalk_iface *atif;
1398 struct sockaddr_at tosat;
1399 int origlen;
1400 struct ddpebits ddphv;
1401
1402 /* Don't mangle buffer if shared */
1403 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1404 goto out;
1405
1406 /* Size check and make sure header is contiguous */
1407 if (!pskb_may_pull(skb, sizeof(*ddp)))
1408 goto freeit;
1409
1410 ddp = ddp_hdr(skb);
1411
1412 /*
1413 * Fix up the length field [Ok this is horrible but otherwise
1414 * I end up with unions of bit fields and messy bit field order
1415 * compiler/endian dependencies..]
1416 */
1417 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1418
1419 /* Trim buffer in case of stray trailing data */
1420 origlen = skb->len;
1421 skb_trim(skb, min_t(unsigned int, skb->len, ddphv.deh_len));
1422
1423 /*
1424 * Size check to see if ddp->deh_len was crap
1425 * (Otherwise we'll detonate most spectacularly
1426 * in the middle of recvmsg()).
1427 */
1428 if (skb->len < sizeof(*ddp))
1429 goto freeit;
1430
1431 /*
1432 * Any checksums. Note we don't do htons() on this == is assumed to be
1433 * valid for net byte orders all over the networking code...
1434 */
1435 if (ddp->deh_sum &&
1436 atalk_checksum(skb, ddphv.deh_len) != ddp->deh_sum)
1437 /* Not a valid AppleTalk frame - dustbin time */
1438 goto freeit;
1439
1440 /* Check the packet is aimed at us */
1441 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1442 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1443 else
1444 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1445
1446 /* Not ours, so we route the packet via the correct AppleTalk iface */
1447 if (!atif) {
1448 atalk_route_packet(skb, dev, ddp, &ddphv, origlen);
1449 goto out;
1450 }
1451
1452 /* if IP over DDP is not selected this code will be optimized out */
1453 if (is_ip_over_ddp(skb))
1454 return handle_ip_over_ddp(skb);
1455 /*
1456 * Which socket - atalk_search_socket() looks for a *full match*
1457 * of the <net, node, port> tuple.
1458 */
1459 tosat.sat_addr.s_net = ddp->deh_dnet;
1460 tosat.sat_addr.s_node = ddp->deh_dnode;
1461 tosat.sat_port = ddp->deh_dport;
1462
1463 sock = atalk_search_socket(&tosat, atif);
1464 if (!sock) /* But not one of our sockets */
1465 goto freeit;
1466
1467 /* Queue packet (standard) */
1468 skb->sk = sock;
1469
1470 if (sock_queue_rcv_skb(sock, skb) < 0)
1471 goto freeit;
1472 out:
1473 return 0;
1474 freeit:
1475 kfree_skb(skb);
1476 goto out;
1477 }
1478
1479 /*
1480 * Receive a LocalTalk frame. We make some demands on the caller here.
1481 * Caller must provide enough headroom on the packet to pull the short
1482 * header and append a long one.
1483 */
1484 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1485 struct packet_type *pt)
1486 {
1487 /* Expand any short form frames */
1488 if (skb->mac.raw[2] == 1) {
1489 struct ddpehdr *ddp;
1490 /* Find our address */
1491 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1492
1493 if (!ap || skb->len < sizeof(struct ddpshdr))
1494 goto freeit;
1495
1496 /* Don't mangle buffer if shared */
1497 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1498 return 0;
1499
1500 /*
1501 * The push leaves us with a ddephdr not an shdr, and
1502 * handily the port bytes in the right place preset.
1503 */
1504 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1505
1506 /* Now fill in the long header */
1507
1508 /*
1509 * These two first. The mac overlays the new source/dest
1510 * network information so we MUST copy these before
1511 * we write the network numbers !
1512 */
1513
1514 ddp->deh_dnode = skb->mac.raw[0]; /* From physical header */
1515 ddp->deh_snode = skb->mac.raw[1]; /* From physical header */
1516
1517 ddp->deh_dnet = ap->s_net; /* Network number */
1518 ddp->deh_snet = ap->s_net;
1519 ddp->deh_sum = 0; /* No checksum */
1520 /*
1521 * Not sure about this bit...
1522 */
1523 ddp->deh_len = skb->len;
1524 ddp->deh_hops = DDP_MAXHOPS; /* Non routable, so force a drop
1525 if we slip up later */
1526 /* Mend the byte order */
1527 *((__u16 *)ddp) = htons(*((__u16 *)ddp));
1528 }
1529 skb->h.raw = skb->data;
1530
1531 return atalk_rcv(skb, dev, pt);
1532 freeit:
1533 kfree_skb(skb);
1534 return 0;
1535 }
1536
1537 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1538 size_t len)
1539 {
1540 struct sock *sk = sock->sk;
1541 struct atalk_sock *at = at_sk(sk);
1542 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1543 int flags = msg->msg_flags;
1544 int loopback = 0;
1545 struct sockaddr_at local_satalk, gsat;
1546 struct sk_buff *skb;
1547 struct net_device *dev;
1548 struct ddpehdr *ddp;
1549 int size;
1550 struct atalk_route *rt;
1551 int err;
1552
1553 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1554 return -EINVAL;
1555
1556 if (len > DDP_MAXSZ)
1557 return -EMSGSIZE;
1558
1559 if (usat) {
1560 if (sock_flag(sk, SOCK_ZAPPED))
1561 if (atalk_autobind(sk) < 0)
1562 return -EBUSY;
1563
1564 if (msg->msg_namelen < sizeof(*usat) ||
1565 usat->sat_family != AF_APPLETALK)
1566 return -EINVAL;
1567
1568 /* netatalk doesn't implement this check */
1569 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1570 !sock_flag(sk, SOCK_BROADCAST)) {
1571 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1572 "it will break before 2.2\n");
1573 #if 0
1574 return -EPERM;
1575 #endif
1576 }
1577 } else {
1578 if (sk->sk_state != TCP_ESTABLISHED)
1579 return -ENOTCONN;
1580 usat = &local_satalk;
1581 usat->sat_family = AF_APPLETALK;
1582 usat->sat_port = at->dest_port;
1583 usat->sat_addr.s_node = at->dest_node;
1584 usat->sat_addr.s_net = at->dest_net;
1585 }
1586
1587 /* Build a packet */
1588 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1589
1590 /* For headers */
1591 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1592
1593 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1594 rt = atrtr_find(&usat->sat_addr);
1595 if (!rt)
1596 return -ENETUNREACH;
1597
1598 dev = rt->dev;
1599 } else {
1600 struct atalk_addr at_hint;
1601
1602 at_hint.s_node = 0;
1603 at_hint.s_net = at->src_net;
1604
1605 rt = atrtr_find(&at_hint);
1606 if (!rt)
1607 return -ENETUNREACH;
1608
1609 dev = rt->dev;
1610 }
1611
1612 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1613 sk, size, dev->name);
1614
1615 size += dev->hard_header_len;
1616 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1617 if (!skb)
1618 return err;
1619
1620 skb->sk = sk;
1621 skb_reserve(skb, ddp_dl->header_length);
1622 skb_reserve(skb, dev->hard_header_len);
1623 skb->dev = dev;
1624
1625 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1626
1627 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1628 ddp->deh_pad = 0;
1629 ddp->deh_hops = 0;
1630 ddp->deh_len = len + sizeof(*ddp);
1631 /*
1632 * Fix up the length field [Ok this is horrible but otherwise
1633 * I end up with unions of bit fields and messy bit field order
1634 * compiler/endian dependencies..
1635 */
1636 *((__u16 *)ddp) = ntohs(*((__u16 *)ddp));
1637
1638 ddp->deh_dnet = usat->sat_addr.s_net;
1639 ddp->deh_snet = at->src_net;
1640 ddp->deh_dnode = usat->sat_addr.s_node;
1641 ddp->deh_snode = at->src_node;
1642 ddp->deh_dport = usat->sat_port;
1643 ddp->deh_sport = at->src_port;
1644
1645 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1646
1647 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1648 if (err) {
1649 kfree_skb(skb);
1650 return -EFAULT;
1651 }
1652
1653 if (sk->sk_no_check == 1)
1654 ddp->deh_sum = 0;
1655 else
1656 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1657
1658 /*
1659 * Loopback broadcast packets to non gateway targets (ie routes
1660 * to group we are in)
1661 */
1662 if (ddp->deh_dnode == ATADDR_BCAST &&
1663 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1664 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1665
1666 if (skb2) {
1667 loopback = 1;
1668 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1669 if (aarp_send_ddp(dev, skb2,
1670 &usat->sat_addr, NULL) == -1)
1671 kfree_skb(skb2);
1672 /* else queued/sent above in the aarp queue */
1673 }
1674 }
1675
1676 if (dev->flags & IFF_LOOPBACK || loopback) {
1677 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1678 /* loop back */
1679 skb_orphan(skb);
1680 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1681 } else {
1682 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1683 if (rt->flags & RTF_GATEWAY) {
1684 gsat.sat_addr = rt->gateway;
1685 usat = &gsat;
1686 }
1687
1688 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1689 kfree_skb(skb);
1690 /* else queued/sent above in the aarp queue */
1691 }
1692 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1693
1694 return len;
1695 }
1696
1697 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1698 size_t size, int flags)
1699 {
1700 struct sock *sk = sock->sk;
1701 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1702 struct ddpehdr *ddp;
1703 int copied = 0;
1704 int err = 0;
1705 struct ddpebits ddphv;
1706 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1707 flags & MSG_DONTWAIT, &err);
1708 if (!skb)
1709 return err;
1710
1711 /* FIXME: use skb->cb to be able to use shared skbs */
1712 ddp = ddp_hdr(skb);
1713 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1714
1715 if (sk->sk_type == SOCK_RAW) {
1716 copied = ddphv.deh_len;
1717 if (copied > size) {
1718 copied = size;
1719 msg->msg_flags |= MSG_TRUNC;
1720 }
1721
1722 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1723 } else {
1724 copied = ddphv.deh_len - sizeof(*ddp);
1725 if (copied > size) {
1726 copied = size;
1727 msg->msg_flags |= MSG_TRUNC;
1728 }
1729 err = skb_copy_datagram_iovec(skb, sizeof(*ddp),
1730 msg->msg_iov, copied);
1731 }
1732
1733 if (!err) {
1734 if (sat) {
1735 sat->sat_family = AF_APPLETALK;
1736 sat->sat_port = ddp->deh_sport;
1737 sat->sat_addr.s_node = ddp->deh_snode;
1738 sat->sat_addr.s_net = ddp->deh_snet;
1739 }
1740 msg->msg_namelen = sizeof(*sat);
1741 }
1742
1743 skb_free_datagram(sk, skb); /* Free the datagram. */
1744 return err ? : copied;
1745 }
1746
1747
1748 /*
1749 * AppleTalk ioctl calls.
1750 */
1751 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1752 {
1753 int rc = -EINVAL;
1754 struct sock *sk = sock->sk;
1755 void __user *argp = (void __user *)arg;
1756
1757 switch (cmd) {
1758 /* Protocol layer */
1759 case TIOCOUTQ: {
1760 long amount = sk->sk_sndbuf -
1761 atomic_read(&sk->sk_wmem_alloc);
1762
1763 if (amount < 0)
1764 amount = 0;
1765 rc = put_user(amount, (int __user *)argp);
1766 break;
1767 }
1768 case TIOCINQ: {
1769 /*
1770 * These two are safe on a single CPU system as only
1771 * user tasks fiddle here
1772 */
1773 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1774 long amount = 0;
1775
1776 if (skb)
1777 amount = skb->len - sizeof(struct ddpehdr);
1778 rc = put_user(amount, (int __user *)argp);
1779 break;
1780 }
1781 case SIOCGSTAMP:
1782 rc = sock_get_timestamp(sk, argp);
1783 break;
1784 /* Routing */
1785 case SIOCADDRT:
1786 case SIOCDELRT:
1787 rc = -EPERM;
1788 if (capable(CAP_NET_ADMIN))
1789 rc = atrtr_ioctl(cmd, argp);
1790 break;
1791 /* Interface */
1792 case SIOCGIFADDR:
1793 case SIOCSIFADDR:
1794 case SIOCGIFBRDADDR:
1795 case SIOCATALKDIFADDR:
1796 case SIOCDIFADDR:
1797 case SIOCSARP: /* proxy AARP */
1798 case SIOCDARP: /* proxy AARP */
1799 rtnl_lock();
1800 rc = atif_ioctl(cmd, argp);
1801 rtnl_unlock();
1802 break;
1803 /* Physical layer ioctl calls */
1804 case SIOCSIFLINK:
1805 case SIOCGIFHWADDR:
1806 case SIOCSIFHWADDR:
1807 case SIOCGIFFLAGS:
1808 case SIOCSIFFLAGS:
1809 case SIOCGIFTXQLEN:
1810 case SIOCSIFTXQLEN:
1811 case SIOCGIFMTU:
1812 case SIOCGIFCONF:
1813 case SIOCADDMULTI:
1814 case SIOCDELMULTI:
1815 case SIOCGIFCOUNT:
1816 case SIOCGIFINDEX:
1817 case SIOCGIFNAME:
1818 rc = dev_ioctl(cmd, argp);
1819 break;
1820 }
1821
1822 return rc;
1823 }
1824
1825 static struct net_proto_family atalk_family_ops = {
1826 .family = PF_APPLETALK,
1827 .create = atalk_create,
1828 .owner = THIS_MODULE,
1829 };
1830
1831 static struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1832 .family = PF_APPLETALK,
1833 .owner = THIS_MODULE,
1834 .release = atalk_release,
1835 .bind = atalk_bind,
1836 .connect = atalk_connect,
1837 .socketpair = sock_no_socketpair,
1838 .accept = sock_no_accept,
1839 .getname = atalk_getname,
1840 .poll = datagram_poll,
1841 .ioctl = atalk_ioctl,
1842 .listen = sock_no_listen,
1843 .shutdown = sock_no_shutdown,
1844 .setsockopt = sock_no_setsockopt,
1845 .getsockopt = sock_no_getsockopt,
1846 .sendmsg = atalk_sendmsg,
1847 .recvmsg = atalk_recvmsg,
1848 .mmap = sock_no_mmap,
1849 .sendpage = sock_no_sendpage,
1850 };
1851
1852 #include <linux/smp_lock.h>
1853 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1854
1855 static struct notifier_block ddp_notifier = {
1856 .notifier_call = ddp_device_event,
1857 };
1858
1859 static struct packet_type ltalk_packet_type = {
1860 .type = __constant_htons(ETH_P_LOCALTALK),
1861 .func = ltalk_rcv,
1862 };
1863
1864 static struct packet_type ppptalk_packet_type = {
1865 .type = __constant_htons(ETH_P_PPPTALK),
1866 .func = atalk_rcv,
1867 };
1868
1869 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1870
1871 /* Export symbols for use by drivers when AppleTalk is a module */
1872 EXPORT_SYMBOL(aarp_send_ddp);
1873 EXPORT_SYMBOL(atrtr_get_dev);
1874 EXPORT_SYMBOL(atalk_find_dev_addr);
1875
1876 static char atalk_err_snap[] __initdata =
1877 KERN_CRIT "Unable to register DDP with SNAP.\n";
1878
1879 /* Called by proto.c on kernel start up */
1880 static int __init atalk_init(void)
1881 {
1882 int rc = proto_register(&ddp_proto, 0);
1883
1884 if (rc != 0)
1885 goto out;
1886
1887 (void)sock_register(&atalk_family_ops);
1888 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1889 if (!ddp_dl)
1890 printk(atalk_err_snap);
1891
1892 dev_add_pack(&ltalk_packet_type);
1893 dev_add_pack(&ppptalk_packet_type);
1894
1895 register_netdevice_notifier(&ddp_notifier);
1896 aarp_proto_init();
1897 atalk_proc_init();
1898 atalk_register_sysctl();
1899 out:
1900 return rc;
1901 }
1902 module_init(atalk_init);
1903
1904 /*
1905 * No explicit module reference count manipulation is needed in the
1906 * protocol. Socket layer sets module reference count for us
1907 * and interfaces reference counting is done
1908 * by the network device layer.
1909 *
1910 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1911 * sockets be closed from user space.
1912 */
1913 static void __exit atalk_exit(void)
1914 {
1915 #ifdef CONFIG_SYSCTL
1916 atalk_unregister_sysctl();
1917 #endif /* CONFIG_SYSCTL */
1918 atalk_proc_exit();
1919 aarp_cleanup_module(); /* General aarp clean-up. */
1920 unregister_netdevice_notifier(&ddp_notifier);
1921 dev_remove_pack(&ltalk_packet_type);
1922 dev_remove_pack(&ppptalk_packet_type);
1923 unregister_snap_client(ddp_dl);
1924 sock_unregister(PF_APPLETALK);
1925 proto_unregister(&ddp_proto);
1926 }
1927 module_exit(atalk_exit);
1928
1929 MODULE_LICENSE("GPL");
1930 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1931 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1932 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
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