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RT-AC66 3.0.0.4.374.130 core
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / net / appletalk / ddp.c
blob830e96629113bdf201c30a7e29d38fc0b61b03bc
1 /*
2 * DDP: An implementation of the AppleTalk DDP protocol for
3 * Ethernet 'ELAP'.
4 *
5 * Alan Cox <Alan.Cox@linux.org>
6 *
7 * With more than a little assistance from
8 *
9 * Wesley Craig <netatalk@umich.edu>
10 *
11 * Fixes:
12 * Neil Horman : Added missing device ioctls
13 * Michael Callahan : Made routing work
14 * Wesley Craig : Fix probing to listen to a
15 * passed node id.
16 * Alan Cox : Added send/recvmsg support
17 * Alan Cox : Moved at. to protinfo in
18 * socket.
19 * Alan Cox : Added firewall hooks.
20 * Alan Cox : Supports new ARPHRD_LOOPBACK
21 * Christer Weinigel : Routing and /proc fixes.
22 * Bradford Johnson : LocalTalk.
23 * Tom Dyas : Module support.
24 * Alan Cox : Hooks for PPP (based on the
25 * LocalTalk hook).
26 * Alan Cox : Posix bits
27 * Alan Cox/Mike Freeman : Possible fix to NBP problems
28 * Bradford Johnson : IP-over-DDP (experimental)
29 * Jay Schulist : Moved IP-over-DDP to its own
30 * driver file. (ipddp.c & ipddp.h)
31 * Jay Schulist : Made work as module with
32 * AppleTalk drivers, cleaned it.
33 * Rob Newberry : Added proxy AARP and AARP
34 * procfs, moved probing to AARP
35 * module.
36 * Adrian Sun/
37 * Michael Zuelsdorff : fix for net.0 packets. don't
38 * allow illegal ether/tokentalk
39 * port assignment. we lose a
40 * valid localtalk port as a
41 * result.
42 * Arnaldo C. de Melo : Cleanup, in preparation for
43 * shared skb support 8)
44 * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c,
45 * use seq_file
46 *
47 * This program is free software; you can redistribute it and/or
48 * modify it under the terms of the GNU General Public License
49 * as published by the Free Software Foundation; either version
50 * 2 of the License, or (at your option) any later version.
51 *
52 */
53
54 #include <linux/capability.h>
55 #include <linux/module.h>
56 #include <linux/if_arp.h>
57 #include <linux/termios.h> /* For TIOCOUTQ/INQ */
58 #include <net/datalink.h>
59 #include <net/psnap.h>
60 #include <net/sock.h>
61 #include <net/tcp_states.h>
62 #include <net/route.h>
63 #include <linux/atalk.h>
64 #include "../core/kmap_skb.h"
65
66 struct datalink_proto *ddp_dl, *aarp_dl;
67 static const struct proto_ops atalk_dgram_ops;
68
69 /**************************************************************************\
70 * *
71 * Handlers for the socket list. *
72 * *
73 \**************************************************************************/
74
75 HLIST_HEAD(atalk_sockets);
76 DEFINE_RWLOCK(atalk_sockets_lock);
77
78 static inline void __atalk_insert_socket(struct sock *sk)
79 {
80 sk_add_node(sk, &atalk_sockets);
81 }
82
83 static inline void atalk_remove_socket(struct sock *sk)
84 {
85 write_lock_bh(&atalk_sockets_lock);
86 sk_del_node_init(sk);
87 write_unlock_bh(&atalk_sockets_lock);
88 }
89
90 static struct sock *atalk_search_socket(struct sockaddr_at *to,
91 struct atalk_iface *atif)
92 {
93 struct sock *s;
94 struct hlist_node *node;
95
96 read_lock_bh(&atalk_sockets_lock);
97 sk_for_each(s, node, &atalk_sockets) {
98 struct atalk_sock *at = at_sk(s);
99
100 if (to->sat_port != at->src_port)
101 continue;
102
103 if (to->sat_addr.s_net == ATADDR_ANYNET &&
104 to->sat_addr.s_node == ATADDR_BCAST)
105 goto found;
106
107 if (to->sat_addr.s_net == at->src_net &&
108 (to->sat_addr.s_node == at->src_node ||
109 to->sat_addr.s_node == ATADDR_BCAST ||
110 to->sat_addr.s_node == ATADDR_ANYNODE))
111 goto found;
112
113 /* XXXX.0 -- we got a request for this router. make sure
114 * that the node is appropriately set. */
115 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
116 to->sat_addr.s_net != ATADDR_ANYNET &&
117 atif->address.s_node == at->src_node) {
118 to->sat_addr.s_node = atif->address.s_node;
119 goto found;
120 }
121 }
122 s = NULL;
123 found:
124 read_unlock_bh(&atalk_sockets_lock);
125 return s;
126 }
127
128 /**
129 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
130 * @sk - socket to insert in the list if it is not there already
131 * @sat - address to search for
132 *
133 * Try to find a socket matching ADDR in the socket list, if found then return
134 * it. If not, insert SK into the socket list.
135 *
136 * This entire operation must execute atomically.
137 */
138 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
139 struct sockaddr_at *sat)
140 {
141 struct sock *s;
142 struct hlist_node *node;
143 struct atalk_sock *at;
144
145 write_lock_bh(&atalk_sockets_lock);
146 sk_for_each(s, node, &atalk_sockets) {
147 at = at_sk(s);
148
149 if (at->src_net == sat->sat_addr.s_net &&
150 at->src_node == sat->sat_addr.s_node &&
151 at->src_port == sat->sat_port)
152 goto found;
153 }
154 s = NULL;
155 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
156 found:
157 write_unlock_bh(&atalk_sockets_lock);
158 return s;
159 }
160
161 static void atalk_destroy_timer(unsigned long data)
162 {
163 struct sock *sk = (struct sock *)data;
164
165 if (sk_has_allocations(sk)) {
166 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
167 add_timer(&sk->sk_timer);
168 } else
169 sock_put(sk);
170 }
171
172 static inline void atalk_destroy_socket(struct sock *sk)
173 {
174 atalk_remove_socket(sk);
175 skb_queue_purge(&sk->sk_receive_queue);
176
177 if (sk_has_allocations(sk)) {
178 init_timer(&sk->sk_timer);
179 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
180 sk->sk_timer.function = atalk_destroy_timer;
181 sk->sk_timer.data = (unsigned long)sk;
182 add_timer(&sk->sk_timer);
183 } else
184 sock_put(sk);
185 }
186
187 /**************************************************************************\
188 * *
189 * Routing tables for the AppleTalk socket layer. *
190 * *
191 \**************************************************************************/
192
193 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
194 struct atalk_route *atalk_routes;
195 DEFINE_RWLOCK(atalk_routes_lock);
196
197 struct atalk_iface *atalk_interfaces;
198 DEFINE_RWLOCK(atalk_interfaces_lock);
199
200 /* For probing devices or in a routerless network */
201 struct atalk_route atrtr_default;
202
203 /* AppleTalk interface control */
204 /*
205 * Drop a device. Doesn't drop any of its routes - that is the caller's
206 * problem. Called when we down the interface or delete the address.
207 */
208 static void atif_drop_device(struct net_device *dev)
209 {
210 struct atalk_iface **iface = &atalk_interfaces;
211 struct atalk_iface *tmp;
212
213 write_lock_bh(&atalk_interfaces_lock);
214 while ((tmp = *iface) != NULL) {
215 if (tmp->dev == dev) {
216 *iface = tmp->next;
217 dev_put(dev);
218 kfree(tmp);
219 dev->atalk_ptr = NULL;
220 } else
221 iface = &tmp->next;
222 }
223 write_unlock_bh(&atalk_interfaces_lock);
224 }
225
226 static struct atalk_iface *atif_add_device(struct net_device *dev,
227 struct atalk_addr *sa)
228 {
229 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
230
231 if (!iface)
232 goto out;
233
234 dev_hold(dev);
235 iface->dev = dev;
236 dev->atalk_ptr = iface;
237 iface->address = *sa;
238 iface->status = 0;
239
240 write_lock_bh(&atalk_interfaces_lock);
241 iface->next = atalk_interfaces;
242 atalk_interfaces = iface;
243 write_unlock_bh(&atalk_interfaces_lock);
244 out:
245 return iface;
246 }
247
248 /* Perform phase 2 AARP probing on our tentative address */
249 static int atif_probe_device(struct atalk_iface *atif)
250 {
251 int netrange = ntohs(atif->nets.nr_lastnet) -
252 ntohs(atif->nets.nr_firstnet) + 1;
253 int probe_net = ntohs(atif->address.s_net);
254 int probe_node = atif->address.s_node;
255 int netct, nodect;
256
257 /* Offset the network we start probing with */
258 if (probe_net == ATADDR_ANYNET) {
259 probe_net = ntohs(atif->nets.nr_firstnet);
260 if (netrange)
261 probe_net += jiffies % netrange;
262 }
263 if (probe_node == ATADDR_ANYNODE)
264 probe_node = jiffies & 0xFF;
265
266 /* Scan the networks */
267 atif->status |= ATIF_PROBE;
268 for (netct = 0; netct <= netrange; netct++) {
269 /* Sweep the available nodes from a given start */
270 atif->address.s_net = htons(probe_net);
271 for (nodect = 0; nodect < 256; nodect++) {
272 atif->address.s_node = (nodect + probe_node) & 0xFF;
273 if (atif->address.s_node > 0 &&
274 atif->address.s_node < 254) {
275 /* Probe a proposed address */
276 aarp_probe_network(atif);
277
278 if (!(atif->status & ATIF_PROBE_FAIL)) {
279 atif->status &= ~ATIF_PROBE;
280 return 0;
281 }
282 }
283 atif->status &= ~ATIF_PROBE_FAIL;
284 }
285 probe_net++;
286 if (probe_net > ntohs(atif->nets.nr_lastnet))
287 probe_net = ntohs(atif->nets.nr_firstnet);
288 }
289 atif->status &= ~ATIF_PROBE;
290
291 return -EADDRINUSE; /* Network is full... */
292 }
293
294
295 /* Perform AARP probing for a proxy address */
296 static int atif_proxy_probe_device(struct atalk_iface *atif,
297 struct atalk_addr* proxy_addr)
298 {
299 int netrange = ntohs(atif->nets.nr_lastnet) -
300 ntohs(atif->nets.nr_firstnet) + 1;
301 /* we probe the interface's network */
302 int probe_net = ntohs(atif->address.s_net);
303 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
304 int netct, nodect;
305
306 /* Offset the network we start probing with */
307 if (probe_net == ATADDR_ANYNET) {
308 probe_net = ntohs(atif->nets.nr_firstnet);
309 if (netrange)
310 probe_net += jiffies % netrange;
311 }
312
313 if (probe_node == ATADDR_ANYNODE)
314 probe_node = jiffies & 0xFF;
315
316 /* Scan the networks */
317 for (netct = 0; netct <= netrange; netct++) {
318 /* Sweep the available nodes from a given start */
319 proxy_addr->s_net = htons(probe_net);
320 for (nodect = 0; nodect < 256; nodect++) {
321 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
322 if (proxy_addr->s_node > 0 &&
323 proxy_addr->s_node < 254) {
324 /* Tell AARP to probe a proposed address */
325 int ret = aarp_proxy_probe_network(atif,
326 proxy_addr);
327
328 if (ret != -EADDRINUSE)
329 return ret;
330 }
331 }
332 probe_net++;
333 if (probe_net > ntohs(atif->nets.nr_lastnet))
334 probe_net = ntohs(atif->nets.nr_firstnet);
335 }
336
337 return -EADDRINUSE; /* Network is full... */
338 }
339
340
341 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
342 {
343 struct atalk_iface *iface = dev->atalk_ptr;
344 return iface ? &iface->address : NULL;
345 }
346
347 static struct atalk_addr *atalk_find_primary(void)
348 {
349 struct atalk_iface *fiface = NULL;
350 struct atalk_addr *retval;
351 struct atalk_iface *iface;
352
353 /*
354 * Return a point-to-point interface only if
355 * there is no non-ptp interface available.
356 */
357 read_lock_bh(&atalk_interfaces_lock);
358 for (iface = atalk_interfaces; iface; iface = iface->next) {
359 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
360 fiface = iface;
361 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
362 retval = &iface->address;
363 goto out;
364 }
365 }
366
367 if (fiface)
368 retval = &fiface->address;
369 else if (atalk_interfaces)
370 retval = &atalk_interfaces->address;
371 else
372 retval = NULL;
373 out:
374 read_unlock_bh(&atalk_interfaces_lock);
375 return retval;
376 }
377
378 /*
379 * Find a match for 'any network' - ie any of our interfaces with that
380 * node number will do just nicely.
381 */
382 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
383 {
384 struct atalk_iface *iface = dev->atalk_ptr;
385
386 if (!iface || iface->status & ATIF_PROBE)
387 goto out_err;
388
389 if (node != ATADDR_BCAST &&
390 iface->address.s_node != node &&
391 node != ATADDR_ANYNODE)
392 goto out_err;
393 out:
394 return iface;
395 out_err:
396 iface = NULL;
397 goto out;
398 }
399
400 /* Find a match for a specific network:node pair */
401 static struct atalk_iface *atalk_find_interface(__be16 net, int node)
402 {
403 struct atalk_iface *iface;
404
405 read_lock_bh(&atalk_interfaces_lock);
406 for (iface = atalk_interfaces; iface; iface = iface->next) {
407 if ((node == ATADDR_BCAST ||
408 node == ATADDR_ANYNODE ||
409 iface->address.s_node == node) &&
410 iface->address.s_net == net &&
411 !(iface->status & ATIF_PROBE))
412 break;
413
414 /* XXXX.0 -- net.0 returns the iface associated with net */
415 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
416 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
417 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
418 break;
419 }
420 read_unlock_bh(&atalk_interfaces_lock);
421 return iface;
422 }
423
424
425 /*
426 * Find a route for an AppleTalk packet. This ought to get cached in
427 * the socket (later on...). We know about host routes and the fact
428 * that a route must be direct to broadcast.
429 */
430 static struct atalk_route *atrtr_find(struct atalk_addr *target)
431 {
432 /*
433 * we must search through all routes unless we find a
434 * host route, because some host routes might overlap
435 * network routes
436 */
437 struct atalk_route *net_route = NULL;
438 struct atalk_route *r;
439
440 read_lock_bh(&atalk_routes_lock);
441 for (r = atalk_routes; r; r = r->next) {
442 if (!(r->flags & RTF_UP))
443 continue;
444
445 if (r->target.s_net == target->s_net) {
446 if (r->flags & RTF_HOST) {
447 /*
448 * if this host route is for the target,
449 * the we're done
450 */
451 if (r->target.s_node == target->s_node)
452 goto out;
453 } else
454 /*
455 * this route will work if there isn't a
456 * direct host route, so cache it
457 */
458 net_route = r;
459 }
460 }
461
462 /*
463 * if we found a network route but not a direct host
464 * route, then return it
465 */
466 if (net_route)
467 r = net_route;
468 else if (atrtr_default.dev)
469 r = &atrtr_default;
470 else /* No route can be found */
471 r = NULL;
472 out:
473 read_unlock_bh(&atalk_routes_lock);
474 return r;
475 }
476
477
478 /*
479 * Given an AppleTalk network, find the device to use. This can be
480 * a simple lookup.
481 */
482 struct net_device *atrtr_get_dev(struct atalk_addr *sa)
483 {
484 struct atalk_route *atr = atrtr_find(sa);
485 return atr ? atr->dev : NULL;
486 }
487
488 /* Set up a default router */
489 static void atrtr_set_default(struct net_device *dev)
490 {
491 atrtr_default.dev = dev;
492 atrtr_default.flags = RTF_UP;
493 atrtr_default.gateway.s_net = htons(0);
494 atrtr_default.gateway.s_node = 0;
495 }
496
497 /*
498 * Add a router. Basically make sure it looks valid and stuff the
499 * entry in the list. While it uses netranges we always set them to one
500 * entry to work like netatalk.
501 */
502 static int atrtr_create(struct rtentry *r, struct net_device *devhint)
503 {
504 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
505 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
506 struct atalk_route *rt;
507 struct atalk_iface *iface, *riface;
508 int retval = -EINVAL;
509
510 /*
511 * Fixme: Raise/Lower a routing change semaphore for these
512 * operations.
513 */
514
515 /* Validate the request */
516 if (ta->sat_family != AF_APPLETALK ||
517 (!devhint && ga->sat_family != AF_APPLETALK))
518 goto out;
519
520 /* Now walk the routing table and make our decisions */
521 write_lock_bh(&atalk_routes_lock);
522 for (rt = atalk_routes; rt; rt = rt->next) {
523 if (r->rt_flags != rt->flags)
524 continue;
525
526 if (ta->sat_addr.s_net == rt->target.s_net) {
527 if (!(rt->flags & RTF_HOST))
528 break;
529 if (ta->sat_addr.s_node == rt->target.s_node)
530 break;
531 }
532 }
533
534 if (!devhint) {
535 riface = NULL;
536
537 read_lock_bh(&atalk_interfaces_lock);
538 for (iface = atalk_interfaces; iface; iface = iface->next) {
539 if (!riface &&
540 ntohs(ga->sat_addr.s_net) >=
541 ntohs(iface->nets.nr_firstnet) &&
542 ntohs(ga->sat_addr.s_net) <=
543 ntohs(iface->nets.nr_lastnet))
544 riface = iface;
545
546 if (ga->sat_addr.s_net == iface->address.s_net &&
547 ga->sat_addr.s_node == iface->address.s_node)
548 riface = iface;
549 }
550 read_unlock_bh(&atalk_interfaces_lock);
551
552 retval = -ENETUNREACH;
553 if (!riface)
554 goto out_unlock;
555
556 devhint = riface->dev;
557 }
558
559 if (!rt) {
560 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
561
562 retval = -ENOBUFS;
563 if (!rt)
564 goto out_unlock;
565
566 rt->next = atalk_routes;
567 atalk_routes = rt;
568 }
569
570 /* Fill in the routing entry */
571 rt->target = ta->sat_addr;
572 dev_hold(devhint);
573 rt->dev = devhint;
574 rt->flags = r->rt_flags;
575 rt->gateway = ga->sat_addr;
576
577 retval = 0;
578 out_unlock:
579 write_unlock_bh(&atalk_routes_lock);
580 out:
581 return retval;
582 }
583
584 /* Delete a route. Find it and discard it */
585 static int atrtr_delete(struct atalk_addr * addr)
586 {
587 struct atalk_route **r = &atalk_routes;
588 int retval = 0;
589 struct atalk_route *tmp;
590
591 write_lock_bh(&atalk_routes_lock);
592 while ((tmp = *r) != NULL) {
593 if (tmp->target.s_net == addr->s_net &&
594 (!(tmp->flags&RTF_GATEWAY) ||
595 tmp->target.s_node == addr->s_node)) {
596 *r = tmp->next;
597 dev_put(tmp->dev);
598 kfree(tmp);
599 goto out;
600 }
601 r = &tmp->next;
602 }
603 retval = -ENOENT;
604 out:
605 write_unlock_bh(&atalk_routes_lock);
606 return retval;
607 }
608
609 /*
610 * Called when a device is downed. Just throw away any routes
611 * via it.
612 */
613 static void atrtr_device_down(struct net_device *dev)
614 {
615 struct atalk_route **r = &atalk_routes;
616 struct atalk_route *tmp;
617
618 write_lock_bh(&atalk_routes_lock);
619 while ((tmp = *r) != NULL) {
620 if (tmp->dev == dev) {
621 *r = tmp->next;
622 dev_put(dev);
623 kfree(tmp);
624 } else
625 r = &tmp->next;
626 }
627 write_unlock_bh(&atalk_routes_lock);
628
629 if (atrtr_default.dev == dev)
630 atrtr_set_default(NULL);
631 }
632
633 /* Actually down the interface */
634 static inline void atalk_dev_down(struct net_device *dev)
635 {
636 atrtr_device_down(dev); /* Remove all routes for the device */
637 aarp_device_down(dev); /* Remove AARP entries for the device */
638 atif_drop_device(dev); /* Remove the device */
639 }
640
641 /*
642 * A device event has occurred. Watch for devices going down and
643 * delete our use of them (iface and route).
644 */
645 static int ddp_device_event(struct notifier_block *this, unsigned long event,
646 void *ptr)
647 {
648 if (event == NETDEV_DOWN)
649 /* Discard any use of this */
650 atalk_dev_down(ptr);
651
652 return NOTIFY_DONE;
653 }
654
655 /* ioctl calls. Shouldn't even need touching */
656 /* Device configuration ioctl calls */
657 static int atif_ioctl(int cmd, void __user *arg)
658 {
659 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
660 struct ifreq atreq;
661 struct atalk_netrange *nr;
662 struct sockaddr_at *sa;
663 struct net_device *dev;
664 struct atalk_iface *atif;
665 int ct;
666 int limit;
667 struct rtentry rtdef;
668 int add_route;
669
670 if (copy_from_user(&atreq, arg, sizeof(atreq)))
671 return -EFAULT;
672
673 dev = __dev_get_by_name(atreq.ifr_name);
674 if (!dev)
675 return -ENODEV;
676
677 sa = (struct sockaddr_at *)&atreq.ifr_addr;
678 atif = atalk_find_dev(dev);
679
680 switch (cmd) {
681 case SIOCSIFADDR:
682 if (!capable(CAP_NET_ADMIN))
683 return -EPERM;
684 if (sa->sat_family != AF_APPLETALK)
685 return -EINVAL;
686 if (dev->type != ARPHRD_ETHER &&
687 dev->type != ARPHRD_LOOPBACK &&
688 dev->type != ARPHRD_LOCALTLK &&
689 dev->type != ARPHRD_PPP)
690 return -EPROTONOSUPPORT;
691
692 nr = (struct atalk_netrange *)&sa->sat_zero[0];
693 add_route = 1;
694
695 /*
696 * if this is a point-to-point iface, and we already
697 * have an iface for this AppleTalk address, then we
698 * should not add a route
699 */
700 if ((dev->flags & IFF_POINTOPOINT) &&
701 atalk_find_interface(sa->sat_addr.s_net,
702 sa->sat_addr.s_node)) {
703 printk(KERN_DEBUG "AppleTalk: point-to-point "
704 "interface added with "
705 "existing address\n");
706 add_route = 0;
707 }
708
709 /*
710 * Phase 1 is fine on LocalTalk but we don't do
711 * EtherTalk phase 1. Anyone wanting to add it go ahead.
712 */
713 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
714 return -EPROTONOSUPPORT;
715 if (sa->sat_addr.s_node == ATADDR_BCAST ||
716 sa->sat_addr.s_node == 254)
717 return -EINVAL;
718 if (atif) {
719 /* Already setting address */
720 if (atif->status & ATIF_PROBE)
721 return -EBUSY;
722
723 atif->address.s_net = sa->sat_addr.s_net;
724 atif->address.s_node = sa->sat_addr.s_node;
725 atrtr_device_down(dev); /* Flush old routes */
726 } else {
727 atif = atif_add_device(dev, &sa->sat_addr);
728 if (!atif)
729 return -ENOMEM;
730 }
731 atif->nets = *nr;
732
733 /*
734 * Check if the chosen address is used. If so we
735 * error and atalkd will try another.
736 */
737
738 if (!(dev->flags & IFF_LOOPBACK) &&
739 !(dev->flags & IFF_POINTOPOINT) &&
740 atif_probe_device(atif) < 0) {
741 atif_drop_device(dev);
742 return -EADDRINUSE;
743 }
744
745 /* Hey it worked - add the direct routes */
746 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
747 sa->sat_family = AF_APPLETALK;
748 sa->sat_addr.s_net = atif->address.s_net;
749 sa->sat_addr.s_node = atif->address.s_node;
750 sa = (struct sockaddr_at *)&rtdef.rt_dst;
751 rtdef.rt_flags = RTF_UP;
752 sa->sat_family = AF_APPLETALK;
753 sa->sat_addr.s_node = ATADDR_ANYNODE;
754 if (dev->flags & IFF_LOOPBACK ||
755 dev->flags & IFF_POINTOPOINT)
756 rtdef.rt_flags |= RTF_HOST;
757
758 /* Routerless initial state */
759 if (nr->nr_firstnet == htons(0) &&
760 nr->nr_lastnet == htons(0xFFFE)) {
761 sa->sat_addr.s_net = atif->address.s_net;
762 atrtr_create(&rtdef, dev);
763 atrtr_set_default(dev);
764 } else {
765 limit = ntohs(nr->nr_lastnet);
766 if (limit - ntohs(nr->nr_firstnet) > 4096) {
767 printk(KERN_WARNING "Too many routes/"
768 "iface.\n");
769 return -EINVAL;
770 }
771 if (add_route)
772 for (ct = ntohs(nr->nr_firstnet);
773 ct <= limit; ct++) {
774 sa->sat_addr.s_net = htons(ct);
775 atrtr_create(&rtdef, dev);
776 }
777 }
778 dev_mc_add(dev, aarp_mcast, 6, 1);
779 return 0;
780
781 case SIOCGIFADDR:
782 if (!atif)
783 return -EADDRNOTAVAIL;
784
785 sa->sat_family = AF_APPLETALK;
786 sa->sat_addr = atif->address;
787 break;
788
789 case SIOCGIFBRDADDR:
790 if (!atif)
791 return -EADDRNOTAVAIL;
792
793 sa->sat_family = AF_APPLETALK;
794 sa->sat_addr.s_net = atif->address.s_net;
795 sa->sat_addr.s_node = ATADDR_BCAST;
796 break;
797
798 case SIOCATALKDIFADDR:
799 case SIOCDIFADDR:
800 if (!capable(CAP_NET_ADMIN))
801 return -EPERM;
802 if (sa->sat_family != AF_APPLETALK)
803 return -EINVAL;
804 atalk_dev_down(dev);
805 break;
806
807 case SIOCSARP:
808 if (!capable(CAP_NET_ADMIN))
809 return -EPERM;
810 if (sa->sat_family != AF_APPLETALK)
811 return -EINVAL;
812 if (!atif)
813 return -EADDRNOTAVAIL;
814
815 /*
816 * for now, we only support proxy AARP on ELAP;
817 * we should be able to do it for LocalTalk, too.
818 */
819 if (dev->type != ARPHRD_ETHER)
820 return -EPROTONOSUPPORT;
821
822 /*
823 * atif points to the current interface on this network;
824 * we aren't concerned about its current status (at
825 * least for now), but it has all the settings about
826 * the network we're going to probe. Consequently, it
827 * must exist.
828 */
829 if (!atif)
830 return -EADDRNOTAVAIL;
831
832 nr = (struct atalk_netrange *)&(atif->nets);
833 /*
834 * Phase 1 is fine on Localtalk but we don't do
835 * Ethertalk phase 1. Anyone wanting to add it go ahead.
836 */
837 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
838 return -EPROTONOSUPPORT;
839
840 if (sa->sat_addr.s_node == ATADDR_BCAST ||
841 sa->sat_addr.s_node == 254)
842 return -EINVAL;
843
844 /*
845 * Check if the chosen address is used. If so we
846 * error and ATCP will try another.
847 */
848 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
849 return -EADDRINUSE;
850
851 /*
852 * We now have an address on the local network, and
853 * the AARP code will defend it for us until we take it
854 * down. We don't set up any routes right now, because
855 * ATCP will install them manually via SIOCADDRT.
856 */
857 break;
858
859 case SIOCDARP:
860 if (!capable(CAP_NET_ADMIN))
861 return -EPERM;
862 if (sa->sat_family != AF_APPLETALK)
863 return -EINVAL;
864 if (!atif)
865 return -EADDRNOTAVAIL;
866
867 /* give to aarp module to remove proxy entry */
868 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
869 return 0;
870 }
871
872 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
873 }
874
875 /* Routing ioctl() calls */
876 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
877 {
878 struct rtentry rt;
879
880 if (copy_from_user(&rt, arg, sizeof(rt)))
881 return -EFAULT;
882
883 switch (cmd) {
884 case SIOCDELRT:
885 if (rt.rt_dst.sa_family != AF_APPLETALK)
886 return -EINVAL;
887 return atrtr_delete(&((struct sockaddr_at *)
888 &rt.rt_dst)->sat_addr);
889
890 case SIOCADDRT: {
891 struct net_device *dev = NULL;
892 if (rt.rt_dev) {
893 char name[IFNAMSIZ];
894 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
895 return -EFAULT;
896 name[IFNAMSIZ-1] = '\0';
897 dev = __dev_get_by_name(name);
898 if (!dev)
899 return -ENODEV;
900 }
901 return atrtr_create(&rt, dev);
902 }
903 }
904 return -EINVAL;
905 }
906
907 /**************************************************************************\
908 * *
909 * Handling for system calls applied via the various interfaces to an *
910 * AppleTalk socket object. *
911 * *
912 \**************************************************************************/
913
914 /*
915 * Checksum: This is 'optional'. It's quite likely also a good
916 * candidate for assembler hackery 8)
917 */
918 static unsigned long atalk_sum_partial(const unsigned char *data,
919 int len, unsigned long sum)
920 {
921 /* This ought to be unwrapped neatly. I'll trust gcc for now */
922 while (len--) {
923 sum += *data;
924 sum <<= 1;
925 if (sum & 0x10000) {
926 sum++;
927 sum &= 0xffff;
928 }
929 data++;
930 }
931 return sum;
932 }
933
934 /* Checksum skb data -- similar to skb_checksum */
935 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
936 int len, unsigned long sum)
937 {
938 int start = skb_headlen(skb);
939 int i, copy;
940
941 /* checksum stuff in header space */
942 if ( (copy = start - offset) > 0) {
943 if (copy > len)
944 copy = len;
945 sum = atalk_sum_partial(skb->data + offset, copy, sum);
946 if ( (len -= copy) == 0)
947 return sum;
948
949 offset += copy;
950 }
951
952 /* checksum stuff in frags */
953 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
954 int end;
955
956 BUG_TRAP(start <= offset + len);
957
958 end = start + skb_shinfo(skb)->frags[i].size;
959 if ((copy = end - offset) > 0) {
960 u8 *vaddr;
961 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
962
963 if (copy > len)
964 copy = len;
965 vaddr = kmap_skb_frag(frag);
966 sum = atalk_sum_partial(vaddr + frag->page_offset +
967 offset - start, copy, sum);
968 kunmap_skb_frag(vaddr);
969
970 if (!(len -= copy))
971 return sum;
972 offset += copy;
973 }
974 start = end;
975 }
976
977 if (skb_shinfo(skb)->frag_list) {
978 struct sk_buff *list = skb_shinfo(skb)->frag_list;
979
980 for (; list; list = list->next) {
981 int end;
982
983 BUG_TRAP(start <= offset + len);
984
985 end = start + list->len;
986 if ((copy = end - offset) > 0) {
987 if (copy > len)
988 copy = len;
989 sum = atalk_sum_skb(list, offset - start,
990 copy, sum);
991 if ((len -= copy) == 0)
992 return sum;
993 offset += copy;
994 }
995 start = end;
996 }
997 }
998
999 BUG_ON(len > 0);
1000
1001 return sum;
1002 }
1003
1004 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1005 {
1006 unsigned long sum;
1007
1008 /* skip header 4 bytes */
1009 sum = atalk_sum_skb(skb, 4, len-4, 0);
1010
1011 /* Use 0xFFFF for 0. 0 itself means none */
1012 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1013 }
1014
1015 static struct proto ddp_proto = {
1016 .name = "DDP",
1017 .owner = THIS_MODULE,
1018 .obj_size = sizeof(struct atalk_sock),
1019 };
1020
1021 /*
1022 * Create a socket. Initialise the socket, blank the addresses
1023 * set the state.
1024 */
1025 static int atalk_create(struct socket *sock, int protocol)
1026 {
1027 struct sock *sk;
1028 int rc = -ESOCKTNOSUPPORT;
1029
1030 /*
1031 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1032 * and gives you the full ELAP frame. Should be handy for CAP 8)
1033 */
1034 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1035 goto out;
1036 rc = -ENOMEM;
1037 sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1);
1038 if (!sk)
1039 goto out;
1040 rc = 0;
1041 sock->ops = &atalk_dgram_ops;
1042 sock_init_data(sock, sk);
1043
1044 /* Checksums on by default */
1045 sock_set_flag(sk, SOCK_ZAPPED);
1046 out:
1047 return rc;
1048 }
1049
1050 /* Free a socket. No work needed */
1051 static int atalk_release(struct socket *sock)
1052 {
1053 struct sock *sk = sock->sk;
1054
1055 if (sk) {
1056 sock_orphan(sk);
1057 sock->sk = NULL;
1058 atalk_destroy_socket(sk);
1059 }
1060 return 0;
1061 }
1062
1063 /**
1064 * atalk_pick_and_bind_port - Pick a source port when one is not given
1065 * @sk - socket to insert into the tables
1066 * @sat - address to search for
1067 *
1068 * Pick a source port when one is not given. If we can find a suitable free
1069 * one, we insert the socket into the tables using it.
1070 *
1071 * This whole operation must be atomic.
1072 */
1073 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1074 {
1075 int retval;
1076
1077 write_lock_bh(&atalk_sockets_lock);
1078
1079 for (sat->sat_port = ATPORT_RESERVED;
1080 sat->sat_port < ATPORT_LAST;
1081 sat->sat_port++) {
1082 struct sock *s;
1083 struct hlist_node *node;
1084
1085 sk_for_each(s, node, &atalk_sockets) {
1086 struct atalk_sock *at = at_sk(s);
1087
1088 if (at->src_net == sat->sat_addr.s_net &&
1089 at->src_node == sat->sat_addr.s_node &&
1090 at->src_port == sat->sat_port)
1091 goto try_next_port;
1092 }
1093
1094 /* Wheee, it's free, assign and insert. */
1095 __atalk_insert_socket(sk);
1096 at_sk(sk)->src_port = sat->sat_port;
1097 retval = 0;
1098 goto out;
1099
1100 try_next_port:;
1101 }
1102
1103 retval = -EBUSY;
1104 out:
1105 write_unlock_bh(&atalk_sockets_lock);
1106 return retval;
1107 }
1108
1109 static int atalk_autobind(struct sock *sk)
1110 {
1111 struct atalk_sock *at = at_sk(sk);
1112 struct sockaddr_at sat;
1113 struct atalk_addr *ap = atalk_find_primary();
1114 int n = -EADDRNOTAVAIL;
1115
1116 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1117 goto out;
1118
1119 at->src_net = sat.sat_addr.s_net = ap->s_net;
1120 at->src_node = sat.sat_addr.s_node = ap->s_node;
1121
1122 n = atalk_pick_and_bind_port(sk, &sat);
1123 if (!n)
1124 sock_reset_flag(sk, SOCK_ZAPPED);
1125 out:
1126 return n;
1127 }
1128
1129 /* Set the address 'our end' of the connection */
1130 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1131 {
1132 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1133 struct sock *sk = sock->sk;
1134 struct atalk_sock *at = at_sk(sk);
1135
1136 if (!sock_flag(sk, SOCK_ZAPPED) ||
1137 addr_len != sizeof(struct sockaddr_at))
1138 return -EINVAL;
1139
1140 if (addr->sat_family != AF_APPLETALK)
1141 return -EAFNOSUPPORT;
1142
1143 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1144 struct atalk_addr *ap = atalk_find_primary();
1145
1146 if (!ap)
1147 return -EADDRNOTAVAIL;
1148
1149 at->src_net = addr->sat_addr.s_net = ap->s_net;
1150 at->src_node = addr->sat_addr.s_node= ap->s_node;
1151 } else {
1152 if (!atalk_find_interface(addr->sat_addr.s_net,
1153 addr->sat_addr.s_node))
1154 return -EADDRNOTAVAIL;
1155
1156 at->src_net = addr->sat_addr.s_net;
1157 at->src_node = addr->sat_addr.s_node;
1158 }
1159
1160 if (addr->sat_port == ATADDR_ANYPORT) {
1161 int n = atalk_pick_and_bind_port(sk, addr);
1162
1163 if (n < 0)
1164 return n;
1165 } else {
1166 at->src_port = addr->sat_port;
1167
1168 if (atalk_find_or_insert_socket(sk, addr))
1169 return -EADDRINUSE;
1170 }
1171
1172 sock_reset_flag(sk, SOCK_ZAPPED);
1173 return 0;
1174 }
1175
1176 /* Set the address we talk to */
1177 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1178 int addr_len, int flags)
1179 {
1180 struct sock *sk = sock->sk;
1181 struct atalk_sock *at = at_sk(sk);
1182 struct sockaddr_at *addr;
1183
1184 sk->sk_state = TCP_CLOSE;
1185 sock->state = SS_UNCONNECTED;
1186
1187 if (addr_len != sizeof(*addr))
1188 return -EINVAL;
1189
1190 addr = (struct sockaddr_at *)uaddr;
1191
1192 if (addr->sat_family != AF_APPLETALK)
1193 return -EAFNOSUPPORT;
1194
1195 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1196 !sock_flag(sk, SOCK_BROADCAST)) {
1197 #if 1
1198 printk(KERN_WARNING "%s is broken and did not set "
1199 "SO_BROADCAST. It will break when 2.2 is "
1200 "released.\n",
1201 current->comm);
1202 #else
1203 return -EACCES;
1204 #endif
1205 }
1206
1207 if (sock_flag(sk, SOCK_ZAPPED))
1208 if (atalk_autobind(sk) < 0)
1209 return -EBUSY;
1210
1211 if (!atrtr_get_dev(&addr->sat_addr))
1212 return -ENETUNREACH;
1213
1214 at->dest_port = addr->sat_port;
1215 at->dest_net = addr->sat_addr.s_net;
1216 at->dest_node = addr->sat_addr.s_node;
1217
1218 sock->state = SS_CONNECTED;
1219 sk->sk_state = TCP_ESTABLISHED;
1220 return 0;
1221 }
1222
1223 /*
1224 * Find the name of an AppleTalk socket. Just copy the right
1225 * fields into the sockaddr.
1226 */
1227 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1228 int *uaddr_len, int peer)
1229 {
1230 struct sockaddr_at sat;
1231 struct sock *sk = sock->sk;
1232 struct atalk_sock *at = at_sk(sk);
1233
1234 if (sock_flag(sk, SOCK_ZAPPED))
1235 if (atalk_autobind(sk) < 0)
1236 return -ENOBUFS;
1237
1238 *uaddr_len = sizeof(struct sockaddr_at);
1239
1240 if (peer) {
1241 if (sk->sk_state != TCP_ESTABLISHED)
1242 return -ENOTCONN;
1243
1244 sat.sat_addr.s_net = at->dest_net;
1245 sat.sat_addr.s_node = at->dest_node;
1246 sat.sat_port = at->dest_port;
1247 } else {
1248 sat.sat_addr.s_net = at->src_net;
1249 sat.sat_addr.s_node = at->src_node;
1250 sat.sat_port = at->src_port;
1251 }
1252
1253 sat.sat_family = AF_APPLETALK;
1254 memcpy(uaddr, &sat, sizeof(sat));
1255 return 0;
1256 }
1257
1258 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1259 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1260 {
1261 return skb->data[12] == 22;
1262 }
1263
1264 static int handle_ip_over_ddp(struct sk_buff *skb)
1265 {
1266 struct net_device *dev = __dev_get_by_name("ipddp0");
1267 struct net_device_stats *stats;
1268
1269 /* This needs to be able to handle ipddp"N" devices */
1270 if (!dev)
1271 return -ENODEV;
1272
1273 skb->protocol = htons(ETH_P_IP);
1274 skb_pull(skb, 13);
1275 skb->dev = dev;
1276 skb_reset_transport_header(skb);
1277
1278 stats = dev->priv;
1279 stats->rx_packets++;
1280 stats->rx_bytes += skb->len + 13;
1281 netif_rx(skb); /* Send the SKB up to a higher place. */
1282 return 0;
1283 }
1284 #else
1285 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1286 #define is_ip_over_ddp(skb) 0
1287 #define handle_ip_over_ddp(skb) 0
1288 #endif
1289
1290 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1291 struct ddpehdr *ddp, __u16 len_hops,
1292 int origlen)
1293 {
1294 struct atalk_route *rt;
1295 struct atalk_addr ta;
1296
1297 /*
1298 * Don't route multicast, etc., packets, or packets sent to "this
1299 * network"
1300 */
1301 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1302 /*
1303 * FIXME:
1304 *
1305 * Can it ever happen that a packet is from a PPP iface and
1306 * needs to be broadcast onto the default network?
1307 */
1308 if (dev->type == ARPHRD_PPP)
1309 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1310 "packet received from PPP iface\n");
1311 goto free_it;
1312 }
1313
1314 ta.s_net = ddp->deh_dnet;
1315 ta.s_node = ddp->deh_dnode;
1316
1317 /* Route the packet */
1318 rt = atrtr_find(&ta);
1319 /* increment hops count */
1320 len_hops += 1 << 10;
1321 if (!rt || !(len_hops & (15 << 10)))
1322 goto free_it;
1323
1324 /* FIXME: use skb->cb to be able to use shared skbs */
1325
1326 /*
1327 * Route goes through another gateway, so set the target to the
1328 * gateway instead.
1329 */
1330
1331 if (rt->flags & RTF_GATEWAY) {
1332 ta.s_net = rt->gateway.s_net;
1333 ta.s_node = rt->gateway.s_node;
1334 }
1335
1336 /* Fix up skb->len field */
1337 skb_trim(skb, min_t(unsigned int, origlen,
1338 (rt->dev->hard_header_len +
1339 ddp_dl->header_length + (len_hops & 1023))));
1340
1341 /* FIXME: use skb->cb to be able to use shared skbs */
1342 ddp->deh_len_hops = htons(len_hops);
1343
1344 /*
1345 * Send the buffer onwards
1346 *
1347 * Now we must always be careful. If it's come from LocalTalk to
1348 * EtherTalk it might not fit
1349 *
1350 * Order matters here: If a packet has to be copied to make a new
1351 * headroom (rare hopefully) then it won't need unsharing.
1352 *
1353 * Note. ddp-> becomes invalid at the realloc.
1354 */
1355 if (skb_headroom(skb) < 22) {
1356 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1357 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1358 kfree_skb(skb);
1359 if (!nskb)
1360 goto out;
1361 skb = nskb;
1362 } else
1363 skb = skb_unshare(skb, GFP_ATOMIC);
1364
1365 /*
1366 * If the buffer didn't vanish into the lack of space bitbucket we can
1367 * send it.
1368 */
1369 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1370 goto free_it;
1371 out:
1372 return;
1373 free_it:
1374 kfree_skb(skb);
1375 }
1376
1377 /**
1378 * atalk_rcv - Receive a packet (in skb) from device dev
1379 * @skb - packet received
1380 * @dev - network device where the packet comes from
1381 * @pt - packet type
1382 *
1383 * Receive a packet (in skb) from device dev. This has come from the SNAP
1384 * decoder, and on entry skb->transport_header is the DDP header, skb->len
1385 * is the DDP header, skb->len is the DDP length. The physical headers
1386 * have been extracted. PPP should probably pass frames marked as for this
1387 * layer. [ie ARPHRD_ETHERTALK]
1388 */
1389 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1390 struct packet_type *pt, struct net_device *orig_dev)
1391 {
1392 struct ddpehdr *ddp;
1393 struct sock *sock;
1394 struct atalk_iface *atif;
1395 struct sockaddr_at tosat;
1396 int origlen;
1397 __u16 len_hops;
1398
1399 /* Don't mangle buffer if shared */
1400 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1401 goto out;
1402
1403 /* Size check and make sure header is contiguous */
1404 if (!pskb_may_pull(skb, sizeof(*ddp)))
1405 goto freeit;
1406
1407 ddp = ddp_hdr(skb);
1408
1409 len_hops = ntohs(ddp->deh_len_hops);
1410
1411 /* Trim buffer in case of stray trailing data */
1412 origlen = skb->len;
1413 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1414
1415 /*
1416 * Size check to see if ddp->deh_len was crap
1417 * (Otherwise we'll detonate most spectacularly
1418 * in the middle of atalk_checksum() or recvmsg()).
1419 */
1420 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1421 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1422 "skb->len=%u)\n", len_hops & 1023, skb->len);
1423 goto freeit;
1424 }
1425
1426 /*
1427 * Any checksums. Note we don't do htons() on this == is assumed to be
1428 * valid for net byte orders all over the networking code...
1429 */
1430 if (ddp->deh_sum &&
1431 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1432 /* Not a valid AppleTalk frame - dustbin time */
1433 goto freeit;
1434
1435 /* Check the packet is aimed at us */
1436 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1437 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1438 else
1439 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1440
1441 if (!atif) {
1442 /* Not ours, so we route the packet via the correct
1443 * AppleTalk iface
1444 */
1445 atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1446 goto out;
1447 }
1448
1449 /* if IP over DDP is not selected this code will be optimized out */
1450 if (is_ip_over_ddp(skb))
1451 return handle_ip_over_ddp(skb);
1452 /*
1453 * Which socket - atalk_search_socket() looks for a *full match*
1454 * of the <net, node, port> tuple.
1455 */
1456 tosat.sat_addr.s_net = ddp->deh_dnet;
1457 tosat.sat_addr.s_node = ddp->deh_dnode;
1458 tosat.sat_port = ddp->deh_dport;
1459
1460 sock = atalk_search_socket(&tosat, atif);
1461 if (!sock) /* But not one of our sockets */
1462 goto freeit;
1463
1464 /* Queue packet (standard) */
1465 skb->sk = sock;
1466
1467 if (sock_queue_rcv_skb(sock, skb) < 0)
1468 goto freeit;
1469 out:
1470 return 0;
1471 freeit:
1472 kfree_skb(skb);
1473 goto out;
1474 }
1475
1476 /*
1477 * Receive a LocalTalk frame. We make some demands on the caller here.
1478 * Caller must provide enough headroom on the packet to pull the short
1479 * header and append a long one.
1480 */
1481 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1482 struct packet_type *pt, struct net_device *orig_dev)
1483 {
1484 /* Expand any short form frames */
1485 if (skb_mac_header(skb)[2] == 1) {
1486 struct ddpehdr *ddp;
1487 /* Find our address */
1488 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1489
1490 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1491 goto freeit;
1492
1493 /* Don't mangle buffer if shared */
1494 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1495 return 0;
1496
1497 /*
1498 * The push leaves us with a ddephdr not an shdr, and
1499 * handily the port bytes in the right place preset.
1500 */
1501 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1502
1503 /* Now fill in the long header */
1504
1505 /*
1506 * These two first. The mac overlays the new source/dest
1507 * network information so we MUST copy these before
1508 * we write the network numbers !
1509 */
1510
1511 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1512 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
1513
1514 ddp->deh_dnet = ap->s_net; /* Network number */
1515 ddp->deh_snet = ap->s_net;
1516 ddp->deh_sum = 0; /* No checksum */
1517 /*
1518 * Not sure about this bit...
1519 */
1520 /* Non routable, so force a drop if we slip up later */
1521 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1522 }
1523 skb_reset_transport_header(skb);
1524
1525 return atalk_rcv(skb, dev, pt, orig_dev);
1526 freeit:
1527 kfree_skb(skb);
1528 return 0;
1529 }
1530
1531 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1532 size_t len)
1533 {
1534 struct sock *sk = sock->sk;
1535 struct atalk_sock *at = at_sk(sk);
1536 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1537 int flags = msg->msg_flags;
1538 int loopback = 0;
1539 struct sockaddr_at local_satalk, gsat;
1540 struct sk_buff *skb;
1541 struct net_device *dev;
1542 struct ddpehdr *ddp;
1543 int size;
1544 struct atalk_route *rt;
1545 int err;
1546
1547 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1548 return -EINVAL;
1549
1550 if (len > DDP_MAXSZ)
1551 return -EMSGSIZE;
1552
1553 if (usat) {
1554 if (sock_flag(sk, SOCK_ZAPPED))
1555 if (atalk_autobind(sk) < 0)
1556 return -EBUSY;
1557
1558 if (msg->msg_namelen < sizeof(*usat) ||
1559 usat->sat_family != AF_APPLETALK)
1560 return -EINVAL;
1561
1562 /* netatalk doesn't implement this check */
1563 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1564 !sock_flag(sk, SOCK_BROADCAST)) {
1565 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1566 "it will break before 2.2\n");
1567 #if 0
1568 return -EPERM;
1569 #endif
1570 }
1571 } else {
1572 if (sk->sk_state != TCP_ESTABLISHED)
1573 return -ENOTCONN;
1574 usat = &local_satalk;
1575 usat->sat_family = AF_APPLETALK;
1576 usat->sat_port = at->dest_port;
1577 usat->sat_addr.s_node = at->dest_node;
1578 usat->sat_addr.s_net = at->dest_net;
1579 }
1580
1581 /* Build a packet */
1582 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1583
1584 /* For headers */
1585 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1586
1587 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1588 rt = atrtr_find(&usat->sat_addr);
1589 } else {
1590 struct atalk_addr at_hint;
1591
1592 at_hint.s_node = 0;
1593 at_hint.s_net = at->src_net;
1594
1595 rt = atrtr_find(&at_hint);
1596 }
1597 if (!rt)
1598 return -ENETUNREACH;
1599
1600 dev = rt->dev;
1601
1602 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1603 sk, size, dev->name);
1604
1605 size += dev->hard_header_len;
1606 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1607 if (!skb)
1608 return err;
1609
1610 skb->sk = sk;
1611 skb_reserve(skb, ddp_dl->header_length);
1612 skb_reserve(skb, dev->hard_header_len);
1613 skb->dev = dev;
1614
1615 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1616
1617 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1618 ddp->deh_len_hops = htons(len + sizeof(*ddp));
1619 ddp->deh_dnet = usat->sat_addr.s_net;
1620 ddp->deh_snet = at->src_net;
1621 ddp->deh_dnode = usat->sat_addr.s_node;
1622 ddp->deh_snode = at->src_node;
1623 ddp->deh_dport = usat->sat_port;
1624 ddp->deh_sport = at->src_port;
1625
1626 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1627
1628 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1629 if (err) {
1630 kfree_skb(skb);
1631 return -EFAULT;
1632 }
1633
1634 if (sk->sk_no_check == 1)
1635 ddp->deh_sum = 0;
1636 else
1637 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1638
1639 /*
1640 * Loopback broadcast packets to non gateway targets (ie routes
1641 * to group we are in)
1642 */
1643 if (ddp->deh_dnode == ATADDR_BCAST &&
1644 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1645 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1646
1647 if (skb2) {
1648 loopback = 1;
1649 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1650 if (aarp_send_ddp(dev, skb2,
1651 &usat->sat_addr, NULL) == -1)
1652 kfree_skb(skb2);
1653 /* else queued/sent above in the aarp queue */
1654 }
1655 }
1656
1657 if (dev->flags & IFF_LOOPBACK || loopback) {
1658 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1659 /* loop back */
1660 skb_orphan(skb);
1661 if (ddp->deh_dnode == ATADDR_BCAST) {
1662 struct atalk_addr at_lo;
1663
1664 at_lo.s_node = 0;
1665 at_lo.s_net = 0;
1666
1667 rt = atrtr_find(&at_lo);
1668 if (!rt) {
1669 kfree_skb(skb);
1670 return -ENETUNREACH;
1671 }
1672 dev = rt->dev;
1673 skb->dev = dev;
1674 }
1675 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1676 } else {
1677 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1678 if (rt->flags & RTF_GATEWAY) {
1679 gsat.sat_addr = rt->gateway;
1680 usat = &gsat;
1681 }
1682
1683 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1684 kfree_skb(skb);
1685 /* else queued/sent above in the aarp queue */
1686 }
1687 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1688
1689 return len;
1690 }
1691
1692 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1693 size_t size, int flags)
1694 {
1695 struct sock *sk = sock->sk;
1696 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1697 struct ddpehdr *ddp;
1698 int copied = 0;
1699 int offset = 0;
1700 int err = 0;
1701 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1702 flags & MSG_DONTWAIT, &err);
1703 if (!skb)
1704 return err;
1705
1706 /* FIXME: use skb->cb to be able to use shared skbs */
1707 ddp = ddp_hdr(skb);
1708 copied = ntohs(ddp->deh_len_hops) & 1023;
1709
1710 if (sk->sk_type != SOCK_RAW) {
1711 offset = sizeof(*ddp);
1712 copied -= offset;
1713 }
1714
1715 if (copied > size) {
1716 copied = size;
1717 msg->msg_flags |= MSG_TRUNC;
1718 }
1719 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1720
1721 if (!err) {
1722 if (sat) {
1723 sat->sat_family = AF_APPLETALK;
1724 sat->sat_port = ddp->deh_sport;
1725 sat->sat_addr.s_node = ddp->deh_snode;
1726 sat->sat_addr.s_net = ddp->deh_snet;
1727 }
1728 msg->msg_namelen = sizeof(*sat);
1729 }
1730
1731 skb_free_datagram(sk, skb); /* Free the datagram. */
1732 return err ? : copied;
1733 }
1734
1735
1736 /*
1737 * AppleTalk ioctl calls.
1738 */
1739 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1740 {
1741 int rc = -ENOIOCTLCMD;
1742 struct sock *sk = sock->sk;
1743 void __user *argp = (void __user *)arg;
1744
1745 switch (cmd) {
1746 /* Protocol layer */
1747 case TIOCOUTQ: {
1748 long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1749
1750 if (amount < 0)
1751 amount = 0;
1752 rc = put_user(amount, (int __user *)argp);
1753 break;
1754 }
1755 case TIOCINQ: {
1756 /*
1757 * These two are safe on a single CPU system as only
1758 * user tasks fiddle here
1759 */
1760 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1761 long amount = 0;
1762
1763 if (skb)
1764 amount = skb->len - sizeof(struct ddpehdr);
1765 rc = put_user(amount, (int __user *)argp);
1766 break;
1767 }
1768 case SIOCGSTAMP:
1769 rc = sock_get_timestamp(sk, argp);
1770 break;
1771 case SIOCGSTAMPNS:
1772 rc = sock_get_timestampns(sk, argp);
1773 break;
1774 /* Routing */
1775 case SIOCADDRT:
1776 case SIOCDELRT:
1777 rc = -EPERM;
1778 if (capable(CAP_NET_ADMIN))
1779 rc = atrtr_ioctl(cmd, argp);
1780 break;
1781 /* Interface */
1782 case SIOCGIFADDR:
1783 case SIOCSIFADDR:
1784 case SIOCGIFBRDADDR:
1785 case SIOCATALKDIFADDR:
1786 case SIOCDIFADDR:
1787 case SIOCSARP: /* proxy AARP */
1788 case SIOCDARP: /* proxy AARP */
1789 rtnl_lock();
1790 rc = atif_ioctl(cmd, argp);
1791 rtnl_unlock();
1792 break;
1793 }
1794
1795 return rc;
1796 }
1797
1798
1799 #ifdef CONFIG_COMPAT
1800 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1801 {
1802 /*
1803 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And
1804 * SIOCATALKDIFADDR is handled by upper layer as well, so there is
1805 * nothing to do. Eventually SIOCATALKDIFADDR should be moved
1806 * here so there is no generic SIOCPROTOPRIVATE translation in the
1807 * system.
1808 */
1809 return -ENOIOCTLCMD;
1810 }
1811 #endif
1812
1813
1814 static struct net_proto_family atalk_family_ops = {
1815 .family = PF_APPLETALK,
1816 .create = atalk_create,
1817 .owner = THIS_MODULE,
1818 };
1819
1820 static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1821 .family = PF_APPLETALK,
1822 .owner = THIS_MODULE,
1823 .release = atalk_release,
1824 .bind = atalk_bind,
1825 .connect = atalk_connect,
1826 .socketpair = sock_no_socketpair,
1827 .accept = sock_no_accept,
1828 .getname = atalk_getname,
1829 .poll = datagram_poll,
1830 .ioctl = atalk_ioctl,
1831 #ifdef CONFIG_COMPAT
1832 .compat_ioctl = atalk_compat_ioctl,
1833 #endif
1834 .listen = sock_no_listen,
1835 .shutdown = sock_no_shutdown,
1836 .setsockopt = sock_no_setsockopt,
1837 .getsockopt = sock_no_getsockopt,
1838 .sendmsg = atalk_sendmsg,
1839 .recvmsg = atalk_recvmsg,
1840 .mmap = sock_no_mmap,
1841 .sendpage = sock_no_sendpage,
1842 };
1843
1844 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1845
1846 static struct notifier_block ddp_notifier = {
1847 .notifier_call = ddp_device_event,
1848 };
1849
1850 static struct packet_type ltalk_packet_type = {
1851 .type = __constant_htons(ETH_P_LOCALTALK),
1852 .func = ltalk_rcv,
1853 };
1854
1855 static struct packet_type ppptalk_packet_type = {
1856 .type = __constant_htons(ETH_P_PPPTALK),
1857 .func = atalk_rcv,
1858 };
1859
1860 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1861
1862 /* Export symbols for use by drivers when AppleTalk is a module */
1863 EXPORT_SYMBOL(aarp_send_ddp);
1864 EXPORT_SYMBOL(atrtr_get_dev);
1865 EXPORT_SYMBOL(atalk_find_dev_addr);
1866
1867 static char atalk_err_snap[] __initdata =
1868 KERN_CRIT "Unable to register DDP with SNAP.\n";
1869
1870 /* Called by proto.c on kernel start up */
1871 static int __init atalk_init(void)
1872 {
1873 int rc = proto_register(&ddp_proto, 0);
1874
1875 if (rc != 0)
1876 goto out;
1877
1878 (void)sock_register(&atalk_family_ops);
1879 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1880 if (!ddp_dl)
1881 printk(atalk_err_snap);
1882
1883 dev_add_pack(&ltalk_packet_type);
1884 dev_add_pack(&ppptalk_packet_type);
1885
1886 register_netdevice_notifier(&ddp_notifier);
1887 aarp_proto_init();
1888 atalk_proc_init();
1889 atalk_register_sysctl();
1890 out:
1891 return rc;
1892 }
1893 module_init(atalk_init);
1894
1895 /*
1896 * No explicit module reference count manipulation is needed in the
1897 * protocol. Socket layer sets module reference count for us
1898 * and interfaces reference counting is done
1899 * by the network device layer.
1900 *
1901 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1902 * sockets be closed from user space.
1903 */
1904 static void __exit atalk_exit(void)
1905 {
1906 #ifdef CONFIG_SYSCTL
1907 atalk_unregister_sysctl();
1908 #endif /* CONFIG_SYSCTL */
1909 atalk_proc_exit();
1910 aarp_cleanup_module(); /* General aarp clean-up. */
1911 unregister_netdevice_notifier(&ddp_notifier);
1912 dev_remove_pack(&ltalk_packet_type);
1913 dev_remove_pack(&ppptalk_packet_type);
1914 unregister_snap_client(ddp_dl);
1915 sock_unregister(PF_APPLETALK);
1916 proto_unregister(&ddp_proto);
1917 }
1918 module_exit(atalk_exit);
1919
1920 MODULE_LICENSE("GPL");
1921 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1922 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1923 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
Tomato firmware and modifications.