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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / appletalk / ddp.c
blobd1fea5c3dda1b08989e8acfed841129e229421b5
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 rt->dev = devhint;
577 rt->flags = r->rt_flags;
578 rt->gateway = ga->sat_addr;
579
580 retval = 0;
581 out_unlock:
582 write_unlock_bh(&atalk_routes_lock);
583 out:
584 return retval;
585 }
586
587 /* Delete a route. Find it and discard it */
588 static int atrtr_delete(struct atalk_addr * addr)
589 {
590 struct atalk_route **r = &atalk_routes;
591 int retval = 0;
592 struct atalk_route *tmp;
593
594 write_lock_bh(&atalk_routes_lock);
595 while ((tmp = *r) != NULL) {
596 if (tmp->target.s_net == addr->s_net &&
597 (!(tmp->flags&RTF_GATEWAY) ||
598 tmp->target.s_node == addr->s_node)) {
599 *r = tmp->next;
600 dev_put(tmp->dev);
601 kfree(tmp);
602 goto out;
603 }
604 r = &tmp->next;
605 }
606 retval = -ENOENT;
607 out:
608 write_unlock_bh(&atalk_routes_lock);
609 return retval;
610 }
611
612 /*
613 * Called when a device is downed. Just throw away any routes
614 * via it.
615 */
616 static void atrtr_device_down(struct net_device *dev)
617 {
618 struct atalk_route **r = &atalk_routes;
619 struct atalk_route *tmp;
620
621 write_lock_bh(&atalk_routes_lock);
622 while ((tmp = *r) != NULL) {
623 if (tmp->dev == dev) {
624 *r = tmp->next;
625 dev_put(dev);
626 kfree(tmp);
627 } else
628 r = &tmp->next;
629 }
630 write_unlock_bh(&atalk_routes_lock);
631
632 if (atrtr_default.dev == dev)
633 atrtr_set_default(NULL);
634 }
635
636 /* Actually down the interface */
637 static inline void atalk_dev_down(struct net_device *dev)
638 {
639 atrtr_device_down(dev); /* Remove all routes for the device */
640 aarp_device_down(dev); /* Remove AARP entries for the device */
641 atif_drop_device(dev); /* Remove the device */
642 }
643
644 /*
645 * A device event has occurred. Watch for devices going down and
646 * delete our use of them (iface and route).
647 */
648 static int ddp_device_event(struct notifier_block *this, unsigned long event,
649 void *ptr)
650 {
651 if (event == NETDEV_DOWN)
652 /* Discard any use of this */
653 atalk_dev_down(ptr);
654
655 return NOTIFY_DONE;
656 }
657
658 /* ioctl calls. Shouldn't even need touching */
659 /* Device configuration ioctl calls */
660 static int atif_ioctl(int cmd, void __user *arg)
661 {
662 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
663 struct ifreq atreq;
664 struct atalk_netrange *nr;
665 struct sockaddr_at *sa;
666 struct net_device *dev;
667 struct atalk_iface *atif;
668 int ct;
669 int limit;
670 struct rtentry rtdef;
671 int add_route;
672
673 if (copy_from_user(&atreq, arg, sizeof(atreq)))
674 return -EFAULT;
675
676 dev = __dev_get_by_name(atreq.ifr_name);
677 if (!dev)
678 return -ENODEV;
679
680 sa = (struct sockaddr_at *)&atreq.ifr_addr;
681 atif = atalk_find_dev(dev);
682
683 switch (cmd) {
684 case SIOCSIFADDR:
685 if (!capable(CAP_NET_ADMIN))
686 return -EPERM;
687 if (sa->sat_family != AF_APPLETALK)
688 return -EINVAL;
689 if (dev->type != ARPHRD_ETHER &&
690 dev->type != ARPHRD_LOOPBACK &&
691 dev->type != ARPHRD_LOCALTLK &&
692 dev->type != ARPHRD_PPP)
693 return -EPROTONOSUPPORT;
694
695 nr = (struct atalk_netrange *)&sa->sat_zero[0];
696 add_route = 1;
697
698 /*
699 * if this is a point-to-point iface, and we already
700 * have an iface for this AppleTalk address, then we
701 * should not add a route
702 */
703 if ((dev->flags & IFF_POINTOPOINT) &&
704 atalk_find_interface(sa->sat_addr.s_net,
705 sa->sat_addr.s_node)) {
706 printk(KERN_DEBUG "AppleTalk: point-to-point "
707 "interface added with "
708 "existing address\n");
709 add_route = 0;
710 }
711
712 /*
713 * Phase 1 is fine on LocalTalk but we don't do
714 * EtherTalk phase 1. Anyone wanting to add it go ahead.
715 */
716 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
717 return -EPROTONOSUPPORT;
718 if (sa->sat_addr.s_node == ATADDR_BCAST ||
719 sa->sat_addr.s_node == 254)
720 return -EINVAL;
721 if (atif) {
722 /* Already setting address */
723 if (atif->status & ATIF_PROBE)
724 return -EBUSY;
725
726 atif->address.s_net = sa->sat_addr.s_net;
727 atif->address.s_node = sa->sat_addr.s_node;
728 atrtr_device_down(dev); /* Flush old routes */
729 } else {
730 atif = atif_add_device(dev, &sa->sat_addr);
731 if (!atif)
732 return -ENOMEM;
733 }
734 atif->nets = *nr;
735
736 /*
737 * Check if the chosen address is used. If so we
738 * error and atalkd will try another.
739 */
740
741 if (!(dev->flags & IFF_LOOPBACK) &&
742 !(dev->flags & IFF_POINTOPOINT) &&
743 atif_probe_device(atif) < 0) {
744 atif_drop_device(dev);
745 return -EADDRINUSE;
746 }
747
748 /* Hey it worked - add the direct routes */
749 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
750 sa->sat_family = AF_APPLETALK;
751 sa->sat_addr.s_net = atif->address.s_net;
752 sa->sat_addr.s_node = atif->address.s_node;
753 sa = (struct sockaddr_at *)&rtdef.rt_dst;
754 rtdef.rt_flags = RTF_UP;
755 sa->sat_family = AF_APPLETALK;
756 sa->sat_addr.s_node = ATADDR_ANYNODE;
757 if (dev->flags & IFF_LOOPBACK ||
758 dev->flags & IFF_POINTOPOINT)
759 rtdef.rt_flags |= RTF_HOST;
760
761 /* Routerless initial state */
762 if (nr->nr_firstnet == htons(0) &&
763 nr->nr_lastnet == htons(0xFFFE)) {
764 sa->sat_addr.s_net = atif->address.s_net;
765 atrtr_create(&rtdef, dev);
766 atrtr_set_default(dev);
767 } else {
768 limit = ntohs(nr->nr_lastnet);
769 if (limit - ntohs(nr->nr_firstnet) > 4096) {
770 printk(KERN_WARNING "Too many routes/"
771 "iface.\n");
772 return -EINVAL;
773 }
774 if (add_route)
775 for (ct = ntohs(nr->nr_firstnet);
776 ct <= limit; ct++) {
777 sa->sat_addr.s_net = htons(ct);
778 atrtr_create(&rtdef, dev);
779 }
780 }
781 dev_mc_add(dev, aarp_mcast, 6, 1);
782 return 0;
783
784 case SIOCGIFADDR:
785 if (!atif)
786 return -EADDRNOTAVAIL;
787
788 sa->sat_family = AF_APPLETALK;
789 sa->sat_addr = atif->address;
790 break;
791
792 case SIOCGIFBRDADDR:
793 if (!atif)
794 return -EADDRNOTAVAIL;
795
796 sa->sat_family = AF_APPLETALK;
797 sa->sat_addr.s_net = atif->address.s_net;
798 sa->sat_addr.s_node = ATADDR_BCAST;
799 break;
800
801 case SIOCATALKDIFADDR:
802 case SIOCDIFADDR:
803 if (!capable(CAP_NET_ADMIN))
804 return -EPERM;
805 if (sa->sat_family != AF_APPLETALK)
806 return -EINVAL;
807 atalk_dev_down(dev);
808 break;
809
810 case SIOCSARP:
811 if (!capable(CAP_NET_ADMIN))
812 return -EPERM;
813 if (sa->sat_family != AF_APPLETALK)
814 return -EINVAL;
815 if (!atif)
816 return -EADDRNOTAVAIL;
817
818 /*
819 * for now, we only support proxy AARP on ELAP;
820 * we should be able to do it for LocalTalk, too.
821 */
822 if (dev->type != ARPHRD_ETHER)
823 return -EPROTONOSUPPORT;
824
825 /*
826 * atif points to the current interface on this network;
827 * we aren't concerned about its current status (at
828 * least for now), but it has all the settings about
829 * the network we're going to probe. Consequently, it
830 * must exist.
831 */
832 if (!atif)
833 return -EADDRNOTAVAIL;
834
835 nr = (struct atalk_netrange *)&(atif->nets);
836 /*
837 * Phase 1 is fine on Localtalk but we don't do
838 * Ethertalk phase 1. Anyone wanting to add it go ahead.
839 */
840 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
841 return -EPROTONOSUPPORT;
842
843 if (sa->sat_addr.s_node == ATADDR_BCAST ||
844 sa->sat_addr.s_node == 254)
845 return -EINVAL;
846
847 /*
848 * Check if the chosen address is used. If so we
849 * error and ATCP will try another.
850 */
851 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
852 return -EADDRINUSE;
853
854 /*
855 * We now have an address on the local network, and
856 * the AARP code will defend it for us until we take it
857 * down. We don't set up any routes right now, because
858 * ATCP will install them manually via SIOCADDRT.
859 */
860 break;
861
862 case SIOCDARP:
863 if (!capable(CAP_NET_ADMIN))
864 return -EPERM;
865 if (sa->sat_family != AF_APPLETALK)
866 return -EINVAL;
867 if (!atif)
868 return -EADDRNOTAVAIL;
869
870 /* give to aarp module to remove proxy entry */
871 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
872 return 0;
873 }
874
875 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
876 }
877
878 /* Routing ioctl() calls */
879 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
880 {
881 struct rtentry rt;
882
883 if (copy_from_user(&rt, arg, sizeof(rt)))
884 return -EFAULT;
885
886 switch (cmd) {
887 case SIOCDELRT:
888 if (rt.rt_dst.sa_family != AF_APPLETALK)
889 return -EINVAL;
890 return atrtr_delete(&((struct sockaddr_at *)
891 &rt.rt_dst)->sat_addr);
892
893 case SIOCADDRT: {
894 struct net_device *dev = NULL;
895 if (rt.rt_dev) {
896 char name[IFNAMSIZ];
897 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
898 return -EFAULT;
899 name[IFNAMSIZ-1] = '\0';
900 dev = __dev_get_by_name(name);
901 if (!dev)
902 return -ENODEV;
903 }
904 return atrtr_create(&rt, dev);
905 }
906 }
907 return -EINVAL;
908 }
909
910 /**************************************************************************\
911 * *
912 * Handling for system calls applied via the various interfaces to an *
913 * AppleTalk socket object. *
914 * *
915 \**************************************************************************/
916
917 /*
918 * Checksum: This is 'optional'. It's quite likely also a good
919 * candidate for assembler hackery 8)
920 */
921 static unsigned long atalk_sum_partial(const unsigned char *data,
922 int len, unsigned long sum)
923 {
924 /* This ought to be unwrapped neatly. I'll trust gcc for now */
925 while (len--) {
926 sum += *data;
927 sum <<= 1;
928 if (sum & 0x10000) {
929 sum++;
930 sum &= 0xffff;
931 }
932 data++;
933 }
934 return sum;
935 }
936
937 /* Checksum skb data -- similar to skb_checksum */
938 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
939 int len, unsigned long sum)
940 {
941 int start = skb_headlen(skb);
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 BUG_TRAP(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 if (skb_shinfo(skb)->frag_list) {
981 struct sk_buff *list = skb_shinfo(skb)->frag_list;
982
983 for (; list; list = list->next) {
984 int end;
985
986 BUG_TRAP(start <= offset + len);
987
988 end = start + list->len;
989 if ((copy = end - offset) > 0) {
990 if (copy > len)
991 copy = len;
992 sum = atalk_sum_skb(list, offset - start,
993 copy, sum);
994 if ((len -= copy) == 0)
995 return sum;
996 offset += copy;
997 }
998 start = end;
999 }
1000 }
1001
1002 BUG_ON(len > 0);
1003
1004 return sum;
1005 }
1006
1007 static unsigned short atalk_checksum(const struct sk_buff *skb, int len)
1008 {
1009 unsigned long sum;
1010
1011 /* skip header 4 bytes */
1012 sum = atalk_sum_skb(skb, 4, len-4, 0);
1013
1014 /* Use 0xFFFF for 0. 0 itself means none */
1015 return sum ? htons((unsigned short)sum) : 0xFFFF;
1016 }
1017
1018 static struct proto ddp_proto = {
1019 .name = "DDP",
1020 .owner = THIS_MODULE,
1021 .obj_size = sizeof(struct atalk_sock),
1022 };
1023
1024 /*
1025 * Create a socket. Initialise the socket, blank the addresses
1026 * set the state.
1027 */
1028 static int atalk_create(struct socket *sock, int protocol)
1029 {
1030 struct sock *sk;
1031 int rc = -ESOCKTNOSUPPORT;
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(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1);
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 if (sk) {
1059 sock_orphan(sk);
1060 sock->sk = NULL;
1061 atalk_destroy_socket(sk);
1062 }
1063 return 0;
1064 }
1065
1066 /**
1067 * atalk_pick_and_bind_port - Pick a source port when one is not given
1068 * @sk - socket to insert into the tables
1069 * @sat - address to search for
1070 *
1071 * Pick a source port when one is not given. If we can find a suitable free
1072 * one, we insert the socket into the tables using it.
1073 *
1074 * This whole operation must be atomic.
1075 */
1076 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1077 {
1078 int retval;
1079
1080 write_lock_bh(&atalk_sockets_lock);
1081
1082 for (sat->sat_port = ATPORT_RESERVED;
1083 sat->sat_port < ATPORT_LAST;
1084 sat->sat_port++) {
1085 struct sock *s;
1086 struct hlist_node *node;
1087
1088 sk_for_each(s, node, &atalk_sockets) {
1089 struct atalk_sock *at = at_sk(s);
1090
1091 if (at->src_net == sat->sat_addr.s_net &&
1092 at->src_node == sat->sat_addr.s_node &&
1093 at->src_port == sat->sat_port)
1094 goto try_next_port;
1095 }
1096
1097 /* Wheee, it's free, assign and insert. */
1098 __atalk_insert_socket(sk);
1099 at_sk(sk)->src_port = sat->sat_port;
1100 retval = 0;
1101 goto out;
1102
1103 try_next_port:;
1104 }
1105
1106 retval = -EBUSY;
1107 out:
1108 write_unlock_bh(&atalk_sockets_lock);
1109 return retval;
1110 }
1111
1112 static int atalk_autobind(struct sock *sk)
1113 {
1114 struct atalk_sock *at = at_sk(sk);
1115 struct sockaddr_at sat;
1116 struct atalk_addr *ap = atalk_find_primary();
1117 int n = -EADDRNOTAVAIL;
1118
1119 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1120 goto out;
1121
1122 at->src_net = sat.sat_addr.s_net = ap->s_net;
1123 at->src_node = sat.sat_addr.s_node = ap->s_node;
1124
1125 n = atalk_pick_and_bind_port(sk, &sat);
1126 if (!n)
1127 sock_reset_flag(sk, SOCK_ZAPPED);
1128 out:
1129 return n;
1130 }
1131
1132 /* Set the address 'our end' of the connection */
1133 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1134 {
1135 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1136 struct sock *sk = sock->sk;
1137 struct atalk_sock *at = at_sk(sk);
1138
1139 if (!sock_flag(sk, SOCK_ZAPPED) ||
1140 addr_len != sizeof(struct sockaddr_at))
1141 return -EINVAL;
1142
1143 if (addr->sat_family != AF_APPLETALK)
1144 return -EAFNOSUPPORT;
1145
1146 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1147 struct atalk_addr *ap = atalk_find_primary();
1148
1149 if (!ap)
1150 return -EADDRNOTAVAIL;
1151
1152 at->src_net = addr->sat_addr.s_net = ap->s_net;
1153 at->src_node = addr->sat_addr.s_node= ap->s_node;
1154 } else {
1155 if (!atalk_find_interface(addr->sat_addr.s_net,
1156 addr->sat_addr.s_node))
1157 return -EADDRNOTAVAIL;
1158
1159 at->src_net = addr->sat_addr.s_net;
1160 at->src_node = addr->sat_addr.s_node;
1161 }
1162
1163 if (addr->sat_port == ATADDR_ANYPORT) {
1164 int n = atalk_pick_and_bind_port(sk, addr);
1165
1166 if (n < 0)
1167 return n;
1168 } else {
1169 at->src_port = addr->sat_port;
1170
1171 if (atalk_find_or_insert_socket(sk, addr))
1172 return -EADDRINUSE;
1173 }
1174
1175 sock_reset_flag(sk, SOCK_ZAPPED);
1176 return 0;
1177 }
1178
1179 /* Set the address we talk to */
1180 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1181 int addr_len, int flags)
1182 {
1183 struct sock *sk = sock->sk;
1184 struct atalk_sock *at = at_sk(sk);
1185 struct sockaddr_at *addr;
1186
1187 sk->sk_state = TCP_CLOSE;
1188 sock->state = SS_UNCONNECTED;
1189
1190 if (addr_len != sizeof(*addr))
1191 return -EINVAL;
1192
1193 addr = (struct sockaddr_at *)uaddr;
1194
1195 if (addr->sat_family != AF_APPLETALK)
1196 return -EAFNOSUPPORT;
1197
1198 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1199 !sock_flag(sk, SOCK_BROADCAST)) {
1200 #if 1
1201 printk(KERN_WARNING "%s is broken and did not set "
1202 "SO_BROADCAST. It will break when 2.2 is "
1203 "released.\n",
1204 current->comm);
1205 #else
1206 return -EACCES;
1207 #endif
1208 }
1209
1210 if (sock_flag(sk, SOCK_ZAPPED))
1211 if (atalk_autobind(sk) < 0)
1212 return -EBUSY;
1213
1214 if (!atrtr_get_dev(&addr->sat_addr))
1215 return -ENETUNREACH;
1216
1217 at->dest_port = addr->sat_port;
1218 at->dest_net = addr->sat_addr.s_net;
1219 at->dest_node = addr->sat_addr.s_node;
1220
1221 sock->state = SS_CONNECTED;
1222 sk->sk_state = TCP_ESTABLISHED;
1223 return 0;
1224 }
1225
1226 /*
1227 * Find the name of an AppleTalk socket. Just copy the right
1228 * fields into the sockaddr.
1229 */
1230 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1231 int *uaddr_len, int peer)
1232 {
1233 struct sockaddr_at sat;
1234 struct sock *sk = sock->sk;
1235 struct atalk_sock *at = at_sk(sk);
1236
1237 if (sock_flag(sk, SOCK_ZAPPED))
1238 if (atalk_autobind(sk) < 0)
1239 return -ENOBUFS;
1240
1241 *uaddr_len = sizeof(struct sockaddr_at);
1242
1243 if (peer) {
1244 if (sk->sk_state != TCP_ESTABLISHED)
1245 return -ENOTCONN;
1246
1247 sat.sat_addr.s_net = at->dest_net;
1248 sat.sat_addr.s_node = at->dest_node;
1249 sat.sat_port = at->dest_port;
1250 } else {
1251 sat.sat_addr.s_net = at->src_net;
1252 sat.sat_addr.s_node = at->src_node;
1253 sat.sat_port = at->src_port;
1254 }
1255
1256 sat.sat_family = AF_APPLETALK;
1257 memcpy(uaddr, &sat, sizeof(sat));
1258 return 0;
1259 }
1260
1261 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1262 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1263 {
1264 return skb->data[12] == 22;
1265 }
1266
1267 static int handle_ip_over_ddp(struct sk_buff *skb)
1268 {
1269 struct net_device *dev = __dev_get_by_name("ipddp0");
1270 struct net_device_stats *stats;
1271
1272 /* This needs to be able to handle ipddp"N" devices */
1273 if (!dev)
1274 return -ENODEV;
1275
1276 skb->protocol = htons(ETH_P_IP);
1277 skb_pull(skb, 13);
1278 skb->dev = dev;
1279 skb->h.raw = skb->data;
1280
1281 stats = dev->priv;
1282 stats->rx_packets++;
1283 stats->rx_bytes += skb->len + 13;
1284 netif_rx(skb); /* Send the SKB up to a higher place. */
1285 return 0;
1286 }
1287 #else
1288 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1289 #define is_ip_over_ddp(skb) 0
1290 #define handle_ip_over_ddp(skb) 0
1291 #endif
1292
1293 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1294 struct ddpehdr *ddp, struct ddpebits *ddphv,
1295 int origlen)
1296 {
1297 struct atalk_route *rt;
1298 struct atalk_addr ta;
1299
1300 /*
1301 * Don't route multicast, etc., packets, or packets sent to "this
1302 * network"
1303 */
1304 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1305 /*
1306 * FIXME:
1307 *
1308 * Can it ever happen that a packet is from a PPP iface and
1309 * needs to be broadcast onto the default network?
1310 */
1311 if (dev->type == ARPHRD_PPP)
1312 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1313 "packet received from PPP iface\n");
1314 goto free_it;
1315 }
1316
1317 ta.s_net = ddp->deh_dnet;
1318 ta.s_node = ddp->deh_dnode;
1319
1320 /* Route the packet */
1321 rt = atrtr_find(&ta);
1322 if (!rt || ddphv->deh_hops == DDP_MAXHOPS)
1323 goto free_it;
1324 /* FIXME: use skb->cb to be able to use shared skbs */
1325 ddphv->deh_hops++;
1326
1327 /*
1328 * Route goes through another gateway, so set the target to the
1329 * gateway instead.
1330 */
1331
1332 if (rt->flags & RTF_GATEWAY) {
1333 ta.s_net = rt->gateway.s_net;
1334 ta.s_node = rt->gateway.s_node;
1335 }
1336
1337 /* Fix up skb->len field */
1338 skb_trim(skb, min_t(unsigned int, origlen,
1339 (rt->dev->hard_header_len +
1340 ddp_dl->header_length + ddphv->deh_len)));
1341
1342 /* Mend the byte order */
1343 /* FIXME: use skb->cb to be able to use shared skbs */
1344 *((__u16 *)ddp) = ntohs(*((__u16 *)ddphv));
1345
1346 /*
1347 * Send the buffer onwards
1348 *
1349 * Now we must always be careful. If it's come from LocalTalk to
1350 * EtherTalk it might not fit
1351 *
1352 * Order matters here: If a packet has to be copied to make a new
1353 * headroom (rare hopefully) then it won't need unsharing.
1354 *
1355 * Note. ddp-> becomes invalid at the realloc.
1356 */
1357 if (skb_headroom(skb) < 22) {
1358 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1359 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1360 kfree_skb(skb);
1361 if (!nskb)
1362 goto out;
1363 skb = nskb;
1364 } else
1365 skb = skb_unshare(skb, GFP_ATOMIC);
1366
1367 /*
1368 * If the buffer didn't vanish into the lack of space bitbucket we can
1369 * send it.
1370 */
1371 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1372 goto free_it;
1373 out:
1374 return;
1375 free_it:
1376 kfree_skb(skb);
1377 }
1378
1379 /**
1380 * atalk_rcv - Receive a packet (in skb) from device dev
1381 * @skb - packet received
1382 * @dev - network device where the packet comes from
1383 * @pt - packet type
1384 *
1385 * Receive a packet (in skb) from device dev. This has come from the SNAP
1386 * decoder, and on entry skb->h.raw is the DDP header, skb->len is the DDP
1387 * header, skb->len is the DDP length. The physical headers have been
1388 * extracted. PPP should probably pass frames marked as for this layer.
1389 * [ie ARPHRD_ETHERTALK]
1390 */
1391 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1392 struct packet_type *pt)
1393 {
1394 struct ddpehdr *ddp;
1395 struct sock *sock;
1396 struct atalk_iface *atif;
1397 struct sockaddr_at tosat;
1398 int origlen;
1399 struct ddpebits ddphv;
1400
1401 /* Don't mangle buffer if shared */
1402 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1403 goto out;
1404
1405 /* Size check and make sure header is contiguous */
1406 if (!pskb_may_pull(skb, sizeof(*ddp)))
1407 goto freeit;
1408
1409 ddp = ddp_hdr(skb);
1410
1411 /*
1412 * Fix up the length field [Ok this is horrible but otherwise
1413 * I end up with unions of bit fields and messy bit field order
1414 * compiler/endian dependencies..]
1415 */
1416 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1417
1418 /* Trim buffer in case of stray trailing data */
1419 origlen = skb->len;
1420 skb_trim(skb, min_t(unsigned int, skb->len, ddphv.deh_len));
1421
1422 /*
1423 * Size check to see if ddp->deh_len was crap
1424 * (Otherwise we'll detonate most spectacularly
1425 * in the middle of recvmsg()).
1426 */
1427 if (skb->len < sizeof(*ddp))
1428 goto freeit;
1429
1430 /*
1431 * Any checksums. Note we don't do htons() on this == is assumed to be
1432 * valid for net byte orders all over the networking code...
1433 */
1434 if (ddp->deh_sum &&
1435 atalk_checksum(skb, ddphv.deh_len) != ddp->deh_sum)
1436 /* Not a valid AppleTalk frame - dustbin time */
1437 goto freeit;
1438
1439 /* Check the packet is aimed at us */
1440 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1441 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1442 else
1443 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1444
1445 /* Not ours, so we route the packet via the correct AppleTalk iface */
1446 if (!atif) {
1447 atalk_route_packet(skb, dev, ddp, &ddphv, origlen);
1448 goto out;
1449 }
1450
1451 /* if IP over DDP is not selected this code will be optimized out */
1452 if (is_ip_over_ddp(skb))
1453 return handle_ip_over_ddp(skb);
1454 /*
1455 * Which socket - atalk_search_socket() looks for a *full match*
1456 * of the <net, node, port> tuple.
1457 */
1458 tosat.sat_addr.s_net = ddp->deh_dnet;
1459 tosat.sat_addr.s_node = ddp->deh_dnode;
1460 tosat.sat_port = ddp->deh_dport;
1461
1462 sock = atalk_search_socket(&tosat, atif);
1463 if (!sock) /* But not one of our sockets */
1464 goto freeit;
1465
1466 /* Queue packet (standard) */
1467 skb->sk = sock;
1468
1469 if (sock_queue_rcv_skb(sock, skb) < 0)
1470 goto freeit;
1471 out:
1472 return 0;
1473 freeit:
1474 kfree_skb(skb);
1475 goto out;
1476 }
1477
1478 /*
1479 * Receive a LocalTalk frame. We make some demands on the caller here.
1480 * Caller must provide enough headroom on the packet to pull the short
1481 * header and append a long one.
1482 */
1483 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1484 struct packet_type *pt)
1485 {
1486 /* Expand any short form frames */
1487 if (skb->mac.raw[2] == 1) {
1488 struct ddpehdr *ddp;
1489 /* Find our address */
1490 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1491
1492 if (!ap || skb->len < sizeof(struct ddpshdr))
1493 goto freeit;
1494
1495 /* Don't mangle buffer if shared */
1496 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1497 return 0;
1498
1499 /*
1500 * The push leaves us with a ddephdr not an shdr, and
1501 * handily the port bytes in the right place preset.
1502 */
1503 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1504
1505 /* Now fill in the long header */
1506
1507 /*
1508 * These two first. The mac overlays the new source/dest
1509 * network information so we MUST copy these before
1510 * we write the network numbers !
1511 */
1512
1513 ddp->deh_dnode = skb->mac.raw[0]; /* From physical header */
1514 ddp->deh_snode = skb->mac.raw[1]; /* From physical header */
1515
1516 ddp->deh_dnet = ap->s_net; /* Network number */
1517 ddp->deh_snet = ap->s_net;
1518 ddp->deh_sum = 0; /* No checksum */
1519 /*
1520 * Not sure about this bit...
1521 */
1522 ddp->deh_len = skb->len;
1523 ddp->deh_hops = DDP_MAXHOPS; /* Non routable, so force a drop
1524 if we slip up later */
1525 /* Mend the byte order */
1526 *((__u16 *)ddp) = htons(*((__u16 *)ddp));
1527 }
1528 skb->h.raw = skb->data;
1529
1530 return atalk_rcv(skb, dev, pt);
1531 freeit:
1532 kfree_skb(skb);
1533 return 0;
1534 }
1535
1536 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1537 size_t len)
1538 {
1539 struct sock *sk = sock->sk;
1540 struct atalk_sock *at = at_sk(sk);
1541 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1542 int flags = msg->msg_flags;
1543 int loopback = 0;
1544 struct sockaddr_at local_satalk, gsat;
1545 struct sk_buff *skb;
1546 struct net_device *dev;
1547 struct ddpehdr *ddp;
1548 int size;
1549 struct atalk_route *rt;
1550 int err;
1551
1552 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1553 return -EINVAL;
1554
1555 if (len > DDP_MAXSZ)
1556 return -EMSGSIZE;
1557
1558 if (usat) {
1559 if (sock_flag(sk, SOCK_ZAPPED))
1560 if (atalk_autobind(sk) < 0)
1561 return -EBUSY;
1562
1563 if (msg->msg_namelen < sizeof(*usat) ||
1564 usat->sat_family != AF_APPLETALK)
1565 return -EINVAL;
1566
1567 /* netatalk doesn't implement this check */
1568 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1569 !sock_flag(sk, SOCK_BROADCAST)) {
1570 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1571 "it will break before 2.2\n");
1572 #if 0
1573 return -EPERM;
1574 #endif
1575 }
1576 } else {
1577 if (sk->sk_state != TCP_ESTABLISHED)
1578 return -ENOTCONN;
1579 usat = &local_satalk;
1580 usat->sat_family = AF_APPLETALK;
1581 usat->sat_port = at->dest_port;
1582 usat->sat_addr.s_node = at->dest_node;
1583 usat->sat_addr.s_net = at->dest_net;
1584 }
1585
1586 /* Build a packet */
1587 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1588
1589 /* For headers */
1590 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1591
1592 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1593 rt = atrtr_find(&usat->sat_addr);
1594 if (!rt)
1595 return -ENETUNREACH;
1596
1597 dev = rt->dev;
1598 } else {
1599 struct atalk_addr at_hint;
1600
1601 at_hint.s_node = 0;
1602 at_hint.s_net = at->src_net;
1603
1604 rt = atrtr_find(&at_hint);
1605 if (!rt)
1606 return -ENETUNREACH;
1607
1608 dev = rt->dev;
1609 }
1610
1611 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1612 sk, size, dev->name);
1613
1614 size += dev->hard_header_len;
1615 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1616 if (!skb)
1617 return err;
1618
1619 skb->sk = sk;
1620 skb_reserve(skb, ddp_dl->header_length);
1621 skb_reserve(skb, dev->hard_header_len);
1622 skb->dev = dev;
1623
1624 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1625
1626 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1627 ddp->deh_pad = 0;
1628 ddp->deh_hops = 0;
1629 ddp->deh_len = len + sizeof(*ddp);
1630 /*
1631 * Fix up the length field [Ok this is horrible but otherwise
1632 * I end up with unions of bit fields and messy bit field order
1633 * compiler/endian dependencies..
1634 */
1635 *((__u16 *)ddp) = ntohs(*((__u16 *)ddp));
1636
1637 ddp->deh_dnet = usat->sat_addr.s_net;
1638 ddp->deh_snet = at->src_net;
1639 ddp->deh_dnode = usat->sat_addr.s_node;
1640 ddp->deh_snode = at->src_node;
1641 ddp->deh_dport = usat->sat_port;
1642 ddp->deh_sport = at->src_port;
1643
1644 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1645
1646 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1647 if (err) {
1648 kfree_skb(skb);
1649 return -EFAULT;
1650 }
1651
1652 if (sk->sk_no_check == 1)
1653 ddp->deh_sum = 0;
1654 else
1655 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1656
1657 /*
1658 * Loopback broadcast packets to non gateway targets (ie routes
1659 * to group we are in)
1660 */
1661 if (ddp->deh_dnode == ATADDR_BCAST &&
1662 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1663 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1664
1665 if (skb2) {
1666 loopback = 1;
1667 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1668 if (aarp_send_ddp(dev, skb2,
1669 &usat->sat_addr, NULL) == -1)
1670 kfree_skb(skb2);
1671 /* else queued/sent above in the aarp queue */
1672 }
1673 }
1674
1675 if (dev->flags & IFF_LOOPBACK || loopback) {
1676 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1677 /* loop back */
1678 skb_orphan(skb);
1679 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1680 } else {
1681 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1682 if (rt->flags & RTF_GATEWAY) {
1683 gsat.sat_addr = rt->gateway;
1684 usat = &gsat;
1685 }
1686
1687 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1688 kfree_skb(skb);
1689 /* else queued/sent above in the aarp queue */
1690 }
1691 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1692
1693 return len;
1694 }
1695
1696 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1697 size_t size, int flags)
1698 {
1699 struct sock *sk = sock->sk;
1700 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1701 struct ddpehdr *ddp;
1702 int copied = 0;
1703 int err = 0;
1704 struct ddpebits ddphv;
1705 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1706 flags & MSG_DONTWAIT, &err);
1707 if (!skb)
1708 return err;
1709
1710 /* FIXME: use skb->cb to be able to use shared skbs */
1711 ddp = ddp_hdr(skb);
1712 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1713
1714 if (sk->sk_type == SOCK_RAW) {
1715 copied = ddphv.deh_len;
1716 if (copied > size) {
1717 copied = size;
1718 msg->msg_flags |= MSG_TRUNC;
1719 }
1720
1721 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1722 } else {
1723 copied = ddphv.deh_len - sizeof(*ddp);
1724 if (copied > size) {
1725 copied = size;
1726 msg->msg_flags |= MSG_TRUNC;
1727 }
1728 err = skb_copy_datagram_iovec(skb, sizeof(*ddp),
1729 msg->msg_iov, copied);
1730 }
1731
1732 if (!err) {
1733 if (sat) {
1734 sat->sat_family = AF_APPLETALK;
1735 sat->sat_port = ddp->deh_sport;
1736 sat->sat_addr.s_node = ddp->deh_snode;
1737 sat->sat_addr.s_net = ddp->deh_snet;
1738 }
1739 msg->msg_namelen = sizeof(*sat);
1740 }
1741
1742 skb_free_datagram(sk, skb); /* Free the datagram. */
1743 return err ? : copied;
1744 }
1745
1746
1747 /*
1748 * AppleTalk ioctl calls.
1749 */
1750 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1751 {
1752 int rc = -EINVAL;
1753 struct sock *sk = sock->sk;
1754 void __user *argp = (void __user *)arg;
1755
1756 switch (cmd) {
1757 /* Protocol layer */
1758 case TIOCOUTQ: {
1759 long amount = sk->sk_sndbuf -
1760 atomic_read(&sk->sk_wmem_alloc);
1761
1762 if (amount < 0)
1763 amount = 0;
1764 rc = put_user(amount, (int __user *)argp);
1765 break;
1766 }
1767 case TIOCINQ: {
1768 /*
1769 * These two are safe on a single CPU system as only
1770 * user tasks fiddle here
1771 */
1772 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1773 long amount = 0;
1774
1775 if (skb)
1776 amount = skb->len - sizeof(struct ddpehdr);
1777 rc = put_user(amount, (int __user *)argp);
1778 break;
1779 }
1780 case SIOCGSTAMP:
1781 rc = sock_get_timestamp(sk, argp);
1782 break;
1783 /* Routing */
1784 case SIOCADDRT:
1785 case SIOCDELRT:
1786 rc = -EPERM;
1787 if (capable(CAP_NET_ADMIN))
1788 rc = atrtr_ioctl(cmd, argp);
1789 break;
1790 /* Interface */
1791 case SIOCGIFADDR:
1792 case SIOCSIFADDR:
1793 case SIOCGIFBRDADDR:
1794 case SIOCATALKDIFADDR:
1795 case SIOCDIFADDR:
1796 case SIOCSARP: /* proxy AARP */
1797 case SIOCDARP: /* proxy AARP */
1798 rtnl_lock();
1799 rc = atif_ioctl(cmd, argp);
1800 rtnl_unlock();
1801 break;
1802 /* Physical layer ioctl calls */
1803 case SIOCSIFLINK:
1804 case SIOCGIFHWADDR:
1805 case SIOCSIFHWADDR:
1806 case SIOCGIFFLAGS:
1807 case SIOCSIFFLAGS:
1808 case SIOCGIFTXQLEN:
1809 case SIOCSIFTXQLEN:
1810 case SIOCGIFMTU:
1811 case SIOCGIFCONF:
1812 case SIOCADDMULTI:
1813 case SIOCDELMULTI:
1814 case SIOCGIFCOUNT:
1815 case SIOCGIFINDEX:
1816 case SIOCGIFNAME:
1817 rc = dev_ioctl(cmd, argp);
1818 break;
1819 }
1820
1821 return rc;
1822 }
1823
1824 static struct net_proto_family atalk_family_ops = {
1825 .family = PF_APPLETALK,
1826 .create = atalk_create,
1827 .owner = THIS_MODULE,
1828 };
1829
1830 static struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1831 .family = PF_APPLETALK,
1832 .owner = THIS_MODULE,
1833 .release = atalk_release,
1834 .bind = atalk_bind,
1835 .connect = atalk_connect,
1836 .socketpair = sock_no_socketpair,
1837 .accept = sock_no_accept,
1838 .getname = atalk_getname,
1839 .poll = datagram_poll,
1840 .ioctl = atalk_ioctl,
1841 .listen = sock_no_listen,
1842 .shutdown = sock_no_shutdown,
1843 .setsockopt = sock_no_setsockopt,
1844 .getsockopt = sock_no_getsockopt,
1845 .sendmsg = atalk_sendmsg,
1846 .recvmsg = atalk_recvmsg,
1847 .mmap = sock_no_mmap,
1848 .sendpage = sock_no_sendpage,
1849 };
1850
1851 #include <linux/smp_lock.h>
1852 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1853
1854 static struct notifier_block ddp_notifier = {
1855 .notifier_call = ddp_device_event,
1856 };
1857
1858 static struct packet_type ltalk_packet_type = {
1859 .type = __constant_htons(ETH_P_LOCALTALK),
1860 .func = ltalk_rcv,
1861 };
1862
1863 static struct packet_type ppptalk_packet_type = {
1864 .type = __constant_htons(ETH_P_PPPTALK),
1865 .func = atalk_rcv,
1866 };
1867
1868 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1869
1870 /* Export symbols for use by drivers when AppleTalk is a module */
1871 EXPORT_SYMBOL(aarp_send_ddp);
1872 EXPORT_SYMBOL(atrtr_get_dev);
1873 EXPORT_SYMBOL(atalk_find_dev_addr);
1874
1875 static char atalk_err_snap[] __initdata =
1876 KERN_CRIT "Unable to register DDP with SNAP.\n";
1877
1878 /* Called by proto.c on kernel start up */
1879 static int __init atalk_init(void)
1880 {
1881 int rc = proto_register(&ddp_proto, 0);
1882
1883 if (rc != 0)
1884 goto out;
1885
1886 (void)sock_register(&atalk_family_ops);
1887 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1888 if (!ddp_dl)
1889 printk(atalk_err_snap);
1890
1891 dev_add_pack(&ltalk_packet_type);
1892 dev_add_pack(&ppptalk_packet_type);
1893
1894 register_netdevice_notifier(&ddp_notifier);
1895 aarp_proto_init();
1896 atalk_proc_init();
1897 atalk_register_sysctl();
1898 out:
1899 return rc;
1900 }
1901 module_init(atalk_init);
1902
1903 /*
1904 * No explicit module reference count manipulation is needed in the
1905 * protocol. Socket layer sets module reference count for us
1906 * and interfaces reference counting is done
1907 * by the network device layer.
1908 *
1909 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1910 * sockets be closed from user space.
1911 */
1912 static void __exit atalk_exit(void)
1913 {
1914 #ifdef CONFIG_SYSCTL
1915 atalk_unregister_sysctl();
1916 #endif /* CONFIG_SYSCTL */
1917 atalk_proc_exit();
1918 aarp_cleanup_module(); /* General aarp clean-up. */
1919 unregister_netdevice_notifier(&ddp_notifier);
1920 dev_remove_pack(&ltalk_packet_type);
1921 dev_remove_pack(&ppptalk_packet_type);
1922 unregister_snap_client(ddp_dl);
1923 sock_unregister(PF_APPLETALK);
1924 proto_unregister(&ddp_proto);
1925 }
1926 module_exit(atalk_exit);
1927
1928 MODULE_LICENSE("GPL");
1929 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1930 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1931 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree