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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / net / appletalk / ddp.c
blob3be55c8ca4ef660f8cabab3786d0ace8daa4de9d
1 /*
2 * DDP: An implementation of the AppleTalk DDP protocol for
3 * Ethernet 'ELAP'.
4 *
5 * Alan Cox <Alan.Cox@linux.org>
6 *
7 * With more than a little assistance from
8 *
9 * Wesley Craig <netatalk@umich.edu>
10 *
11 * Fixes:
12 * Neil Horman : Added missing device ioctls
13 * Michael Callahan : Made routing work
14 * Wesley Craig : Fix probing to listen to a
15 * passed node id.
16 * Alan Cox : Added send/recvmsg support
17 * Alan Cox : Moved at. to protinfo in
18 * socket.
19 * Alan Cox : Added firewall hooks.
20 * Alan Cox : Supports new ARPHRD_LOOPBACK
21 * Christer Weinigel : Routing and /proc fixes.
22 * Bradford Johnson : LocalTalk.
23 * Tom Dyas : Module support.
24 * Alan Cox : Hooks for PPP (based on the
25 * LocalTalk hook).
26 * Alan Cox : Posix bits
27 * Alan Cox/Mike Freeman : Possible fix to NBP problems
28 * Bradford Johnson : IP-over-DDP (experimental)
29 * Jay Schulist : Moved IP-over-DDP to its own
30 * driver file. (ipddp.c & ipddp.h)
31 * Jay Schulist : Made work as module with
32 * AppleTalk drivers, cleaned it.
33 * Rob Newberry : Added proxy AARP and AARP
34 * procfs, moved probing to AARP
35 * module.
36 * Adrian Sun/
37 * Michael Zuelsdorff : fix for net.0 packets. don't
38 * allow illegal ether/tokentalk
39 * port assignment. we lose a
40 * valid localtalk port as a
41 * result.
42 * Arnaldo C. de Melo : Cleanup, in preparation for
43 * shared skb support 8)
44 * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c,
45 * use seq_file
46 *
47 * This program is free software; you can redistribute it and/or
48 * modify it under the terms of the GNU General Public License
49 * as published by the Free Software Foundation; either version
50 * 2 of the License, or (at your option) any later version.
51 *
52 */
53
54 #include <linux/capability.h>
55 #include <linux/module.h>
56 #include <linux/if_arp.h>
57 #include <linux/termios.h> /* For TIOCOUTQ/INQ */
58 #include <net/datalink.h>
59 #include <net/psnap.h>
60 #include <net/sock.h>
61 #include <net/tcp_states.h>
62 #include <net/route.h>
63 #include <linux/atalk.h>
64 #include "../core/kmap_skb.h"
65
66 struct datalink_proto *ddp_dl, *aarp_dl;
67 static const struct proto_ops atalk_dgram_ops;
68
69 /**************************************************************************\
70 * *
71 * Handlers for the socket list. *
72 * *
73 \**************************************************************************/
74
75 HLIST_HEAD(atalk_sockets);
76 DEFINE_RWLOCK(atalk_sockets_lock);
77
78 static inline void __atalk_insert_socket(struct sock *sk)
79 {
80 sk_add_node(sk, &atalk_sockets);
81 }
82
83 static inline void atalk_remove_socket(struct sock *sk)
84 {
85 write_lock_bh(&atalk_sockets_lock);
86 sk_del_node_init(sk);
87 write_unlock_bh(&atalk_sockets_lock);
88 }
89
90 static struct sock *atalk_search_socket(struct sockaddr_at *to,
91 struct atalk_iface *atif)
92 {
93 struct sock *s;
94 struct hlist_node *node;
95
96 read_lock_bh(&atalk_sockets_lock);
97 sk_for_each(s, node, &atalk_sockets) {
98 struct atalk_sock *at = at_sk(s);
99
100 if (to->sat_port != at->src_port)
101 continue;
102
103 if (to->sat_addr.s_net == ATADDR_ANYNET &&
104 to->sat_addr.s_node == ATADDR_BCAST)
105 goto found;
106
107 if (to->sat_addr.s_net == at->src_net &&
108 (to->sat_addr.s_node == at->src_node ||
109 to->sat_addr.s_node == ATADDR_BCAST ||
110 to->sat_addr.s_node == ATADDR_ANYNODE))
111 goto found;
112
113 /* XXXX.0 -- we got a request for this router. make sure
114 * that the node is appropriately set. */
115 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
116 to->sat_addr.s_net != ATADDR_ANYNET &&
117 atif->address.s_node == at->src_node) {
118 to->sat_addr.s_node = atif->address.s_node;
119 goto found;
120 }
121 }
122 s = NULL;
123 found:
124 read_unlock_bh(&atalk_sockets_lock);
125 return s;
126 }
127
128 /**
129 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
130 * @sk - socket to insert in the list if it is not there already
131 * @sat - address to search for
132 *
133 * Try to find a socket matching ADDR in the socket list, if found then return
134 * it. If not, insert SK into the socket list.
135 *
136 * This entire operation must execute atomically.
137 */
138 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
139 struct sockaddr_at *sat)
140 {
141 struct sock *s;
142 struct hlist_node *node;
143 struct atalk_sock *at;
144
145 write_lock_bh(&atalk_sockets_lock);
146 sk_for_each(s, node, &atalk_sockets) {
147 at = at_sk(s);
148
149 if (at->src_net == sat->sat_addr.s_net &&
150 at->src_node == sat->sat_addr.s_node &&
151 at->src_port == sat->sat_port)
152 goto found;
153 }
154 s = NULL;
155 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
156 found:
157 write_unlock_bh(&atalk_sockets_lock);
158 return s;
159 }
160
161 static void atalk_destroy_timer(unsigned long data)
162 {
163 struct sock *sk = (struct sock *)data;
164
165 if (atomic_read(&sk->sk_wmem_alloc) ||
166 atomic_read(&sk->sk_rmem_alloc)) {
167 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
168 add_timer(&sk->sk_timer);
169 } else
170 sock_put(sk);
171 }
172
173 static inline void atalk_destroy_socket(struct sock *sk)
174 {
175 atalk_remove_socket(sk);
176 skb_queue_purge(&sk->sk_receive_queue);
177
178 if (atomic_read(&sk->sk_wmem_alloc) ||
179 atomic_read(&sk->sk_rmem_alloc)) {
180 setup_timer(&sk->sk_timer, atalk_destroy_timer,
181 (unsigned long)sk);
182 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
183 add_timer(&sk->sk_timer);
184 } else
185 sock_put(sk);
186 }
187
188 /**************************************************************************\
189 * *
190 * Routing tables for the AppleTalk socket layer. *
191 * *
192 \**************************************************************************/
193
194 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
195 struct atalk_route *atalk_routes;
196 DEFINE_RWLOCK(atalk_routes_lock);
197
198 struct atalk_iface *atalk_interfaces;
199 DEFINE_RWLOCK(atalk_interfaces_lock);
200
201 /* For probing devices or in a routerless network */
202 struct atalk_route atrtr_default;
203
204 /* AppleTalk interface control */
205 /*
206 * Drop a device. Doesn't drop any of its routes - that is the caller's
207 * problem. Called when we down the interface or delete the address.
208 */
209 static void atif_drop_device(struct net_device *dev)
210 {
211 struct atalk_iface **iface = &atalk_interfaces;
212 struct atalk_iface *tmp;
213
214 write_lock_bh(&atalk_interfaces_lock);
215 while ((tmp = *iface) != NULL) {
216 if (tmp->dev == dev) {
217 *iface = tmp->next;
218 dev_put(dev);
219 kfree(tmp);
220 dev->atalk_ptr = NULL;
221 } else
222 iface = &tmp->next;
223 }
224 write_unlock_bh(&atalk_interfaces_lock);
225 }
226
227 static struct atalk_iface *atif_add_device(struct net_device *dev,
228 struct atalk_addr *sa)
229 {
230 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
231
232 if (!iface)
233 goto out;
234
235 dev_hold(dev);
236 iface->dev = dev;
237 dev->atalk_ptr = iface;
238 iface->address = *sa;
239 iface->status = 0;
240
241 write_lock_bh(&atalk_interfaces_lock);
242 iface->next = atalk_interfaces;
243 atalk_interfaces = iface;
244 write_unlock_bh(&atalk_interfaces_lock);
245 out:
246 return iface;
247 }
248
249 /* Perform phase 2 AARP probing on our tentative address */
250 static int atif_probe_device(struct atalk_iface *atif)
251 {
252 int netrange = ntohs(atif->nets.nr_lastnet) -
253 ntohs(atif->nets.nr_firstnet) + 1;
254 int probe_net = ntohs(atif->address.s_net);
255 int probe_node = atif->address.s_node;
256 int netct, nodect;
257
258 /* Offset the network we start probing with */
259 if (probe_net == ATADDR_ANYNET) {
260 probe_net = ntohs(atif->nets.nr_firstnet);
261 if (netrange)
262 probe_net += jiffies % netrange;
263 }
264 if (probe_node == ATADDR_ANYNODE)
265 probe_node = jiffies & 0xFF;
266
267 /* Scan the networks */
268 atif->status |= ATIF_PROBE;
269 for (netct = 0; netct <= netrange; netct++) {
270 /* Sweep the available nodes from a given start */
271 atif->address.s_net = htons(probe_net);
272 for (nodect = 0; nodect < 256; nodect++) {
273 atif->address.s_node = (nodect + probe_node) & 0xFF;
274 if (atif->address.s_node > 0 &&
275 atif->address.s_node < 254) {
276 /* Probe a proposed address */
277 aarp_probe_network(atif);
278
279 if (!(atif->status & ATIF_PROBE_FAIL)) {
280 atif->status &= ~ATIF_PROBE;
281 return 0;
282 }
283 }
284 atif->status &= ~ATIF_PROBE_FAIL;
285 }
286 probe_net++;
287 if (probe_net > ntohs(atif->nets.nr_lastnet))
288 probe_net = ntohs(atif->nets.nr_firstnet);
289 }
290 atif->status &= ~ATIF_PROBE;
291
292 return -EADDRINUSE; /* Network is full... */
293 }
294
295
296 /* Perform AARP probing for a proxy address */
297 static int atif_proxy_probe_device(struct atalk_iface *atif,
298 struct atalk_addr* proxy_addr)
299 {
300 int netrange = ntohs(atif->nets.nr_lastnet) -
301 ntohs(atif->nets.nr_firstnet) + 1;
302 /* we probe the interface's network */
303 int probe_net = ntohs(atif->address.s_net);
304 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
305 int netct, nodect;
306
307 /* Offset the network we start probing with */
308 if (probe_net == ATADDR_ANYNET) {
309 probe_net = ntohs(atif->nets.nr_firstnet);
310 if (netrange)
311 probe_net += jiffies % netrange;
312 }
313
314 if (probe_node == ATADDR_ANYNODE)
315 probe_node = jiffies & 0xFF;
316
317 /* Scan the networks */
318 for (netct = 0; netct <= netrange; netct++) {
319 /* Sweep the available nodes from a given start */
320 proxy_addr->s_net = htons(probe_net);
321 for (nodect = 0; nodect < 256; nodect++) {
322 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
323 if (proxy_addr->s_node > 0 &&
324 proxy_addr->s_node < 254) {
325 /* Tell AARP to probe a proposed address */
326 int ret = aarp_proxy_probe_network(atif,
327 proxy_addr);
328
329 if (ret != -EADDRINUSE)
330 return ret;
331 }
332 }
333 probe_net++;
334 if (probe_net > ntohs(atif->nets.nr_lastnet))
335 probe_net = ntohs(atif->nets.nr_firstnet);
336 }
337
338 return -EADDRINUSE; /* Network is full... */
339 }
340
341
342 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
343 {
344 struct atalk_iface *iface = dev->atalk_ptr;
345 return iface ? &iface->address : NULL;
346 }
347
348 static struct atalk_addr *atalk_find_primary(void)
349 {
350 struct atalk_iface *fiface = NULL;
351 struct atalk_addr *retval;
352 struct atalk_iface *iface;
353
354 /*
355 * Return a point-to-point interface only if
356 * there is no non-ptp interface available.
357 */
358 read_lock_bh(&atalk_interfaces_lock);
359 for (iface = atalk_interfaces; iface; iface = iface->next) {
360 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
361 fiface = iface;
362 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
363 retval = &iface->address;
364 goto out;
365 }
366 }
367
368 if (fiface)
369 retval = &fiface->address;
370 else if (atalk_interfaces)
371 retval = &atalk_interfaces->address;
372 else
373 retval = NULL;
374 out:
375 read_unlock_bh(&atalk_interfaces_lock);
376 return retval;
377 }
378
379 /*
380 * Find a match for 'any network' - ie any of our interfaces with that
381 * node number will do just nicely.
382 */
383 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
384 {
385 struct atalk_iface *iface = dev->atalk_ptr;
386
387 if (!iface || iface->status & ATIF_PROBE)
388 goto out_err;
389
390 if (node != ATADDR_BCAST &&
391 iface->address.s_node != node &&
392 node != ATADDR_ANYNODE)
393 goto out_err;
394 out:
395 return iface;
396 out_err:
397 iface = NULL;
398 goto out;
399 }
400
401 /* Find a match for a specific network:node pair */
402 static struct atalk_iface *atalk_find_interface(__be16 net, int node)
403 {
404 struct atalk_iface *iface;
405
406 read_lock_bh(&atalk_interfaces_lock);
407 for (iface = atalk_interfaces; iface; iface = iface->next) {
408 if ((node == ATADDR_BCAST ||
409 node == ATADDR_ANYNODE ||
410 iface->address.s_node == node) &&
411 iface->address.s_net == net &&
412 !(iface->status & ATIF_PROBE))
413 break;
414
415 /* XXXX.0 -- net.0 returns the iface associated with net */
416 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
417 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
418 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
419 break;
420 }
421 read_unlock_bh(&atalk_interfaces_lock);
422 return iface;
423 }
424
425
426 /*
427 * Find a route for an AppleTalk packet. This ought to get cached in
428 * the socket (later on...). We know about host routes and the fact
429 * that a route must be direct to broadcast.
430 */
431 static struct atalk_route *atrtr_find(struct atalk_addr *target)
432 {
433 /*
434 * we must search through all routes unless we find a
435 * host route, because some host routes might overlap
436 * network routes
437 */
438 struct atalk_route *net_route = NULL;
439 struct atalk_route *r;
440
441 read_lock_bh(&atalk_routes_lock);
442 for (r = atalk_routes; r; r = r->next) {
443 if (!(r->flags & RTF_UP))
444 continue;
445
446 if (r->target.s_net == target->s_net) {
447 if (r->flags & RTF_HOST) {
448 /*
449 * if this host route is for the target,
450 * the we're done
451 */
452 if (r->target.s_node == target->s_node)
453 goto out;
454 } else
455 /*
456 * this route will work if there isn't a
457 * direct host route, so cache it
458 */
459 net_route = r;
460 }
461 }
462
463 /*
464 * if we found a network route but not a direct host
465 * route, then return it
466 */
467 if (net_route)
468 r = net_route;
469 else if (atrtr_default.dev)
470 r = &atrtr_default;
471 else /* No route can be found */
472 r = NULL;
473 out:
474 read_unlock_bh(&atalk_routes_lock);
475 return r;
476 }
477
478
479 /*
480 * Given an AppleTalk network, find the device to use. This can be
481 * a simple lookup.
482 */
483 struct net_device *atrtr_get_dev(struct atalk_addr *sa)
484 {
485 struct atalk_route *atr = atrtr_find(sa);
486 return atr ? atr->dev : NULL;
487 }
488
489 /* Set up a default router */
490 static void atrtr_set_default(struct net_device *dev)
491 {
492 atrtr_default.dev = dev;
493 atrtr_default.flags = RTF_UP;
494 atrtr_default.gateway.s_net = htons(0);
495 atrtr_default.gateway.s_node = 0;
496 }
497
498 /*
499 * Add a router. Basically make sure it looks valid and stuff the
500 * entry in the list. While it uses netranges we always set them to one
501 * entry to work like netatalk.
502 */
503 static int atrtr_create(struct rtentry *r, struct net_device *devhint)
504 {
505 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
506 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
507 struct atalk_route *rt;
508 struct atalk_iface *iface, *riface;
509 int retval = -EINVAL;
510
511 /*
512 * Fixme: Raise/Lower a routing change semaphore for these
513 * operations.
514 */
515
516 /* Validate the request */
517 if (ta->sat_family != AF_APPLETALK ||
518 (!devhint && ga->sat_family != AF_APPLETALK))
519 goto out;
520
521 /* Now walk the routing table and make our decisions */
522 write_lock_bh(&atalk_routes_lock);
523 for (rt = atalk_routes; rt; rt = rt->next) {
524 if (r->rt_flags != rt->flags)
525 continue;
526
527 if (ta->sat_addr.s_net == rt->target.s_net) {
528 if (!(rt->flags & RTF_HOST))
529 break;
530 if (ta->sat_addr.s_node == rt->target.s_node)
531 break;
532 }
533 }
534
535 if (!devhint) {
536 riface = NULL;
537
538 read_lock_bh(&atalk_interfaces_lock);
539 for (iface = atalk_interfaces; iface; iface = iface->next) {
540 if (!riface &&
541 ntohs(ga->sat_addr.s_net) >=
542 ntohs(iface->nets.nr_firstnet) &&
543 ntohs(ga->sat_addr.s_net) <=
544 ntohs(iface->nets.nr_lastnet))
545 riface = iface;
546
547 if (ga->sat_addr.s_net == iface->address.s_net &&
548 ga->sat_addr.s_node == iface->address.s_node)
549 riface = iface;
550 }
551 read_unlock_bh(&atalk_interfaces_lock);
552
553 retval = -ENETUNREACH;
554 if (!riface)
555 goto out_unlock;
556
557 devhint = riface->dev;
558 }
559
560 if (!rt) {
561 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
562
563 retval = -ENOBUFS;
564 if (!rt)
565 goto out_unlock;
566
567 rt->next = atalk_routes;
568 atalk_routes = rt;
569 }
570
571 /* Fill in the routing entry */
572 rt->target = ta->sat_addr;
573 dev_hold(devhint);
574 rt->dev = devhint;
575 rt->flags = r->rt_flags;
576 rt->gateway = ga->sat_addr;
577
578 retval = 0;
579 out_unlock:
580 write_unlock_bh(&atalk_routes_lock);
581 out:
582 return retval;
583 }
584
585 /* Delete a route. Find it and discard it */
586 static int atrtr_delete(struct atalk_addr * addr)
587 {
588 struct atalk_route **r = &atalk_routes;
589 int retval = 0;
590 struct atalk_route *tmp;
591
592 write_lock_bh(&atalk_routes_lock);
593 while ((tmp = *r) != NULL) {
594 if (tmp->target.s_net == addr->s_net &&
595 (!(tmp->flags&RTF_GATEWAY) ||
596 tmp->target.s_node == addr->s_node)) {
597 *r = tmp->next;
598 dev_put(tmp->dev);
599 kfree(tmp);
600 goto out;
601 }
602 r = &tmp->next;
603 }
604 retval = -ENOENT;
605 out:
606 write_unlock_bh(&atalk_routes_lock);
607 return retval;
608 }
609
610 /*
611 * Called when a device is downed. Just throw away any routes
612 * via it.
613 */
614 static void atrtr_device_down(struct net_device *dev)
615 {
616 struct atalk_route **r = &atalk_routes;
617 struct atalk_route *tmp;
618
619 write_lock_bh(&atalk_routes_lock);
620 while ((tmp = *r) != NULL) {
621 if (tmp->dev == dev) {
622 *r = tmp->next;
623 dev_put(dev);
624 kfree(tmp);
625 } else
626 r = &tmp->next;
627 }
628 write_unlock_bh(&atalk_routes_lock);
629
630 if (atrtr_default.dev == dev)
631 atrtr_set_default(NULL);
632 }
633
634 /* Actually down the interface */
635 static inline void atalk_dev_down(struct net_device *dev)
636 {
637 atrtr_device_down(dev); /* Remove all routes for the device */
638 aarp_device_down(dev); /* Remove AARP entries for the device */
639 atif_drop_device(dev); /* Remove the device */
640 }
641
642 /*
643 * A device event has occurred. Watch for devices going down and
644 * delete our use of them (iface and route).
645 */
646 static int ddp_device_event(struct notifier_block *this, unsigned long event,
647 void *ptr)
648 {
649 struct net_device *dev = ptr;
650
651 if (dev->nd_net != &init_net)
652 return NOTIFY_DONE;
653
654 if (event == NETDEV_DOWN)
655 /* Discard any use of this */
656 atalk_dev_down(dev);
657
658 return NOTIFY_DONE;
659 }
660
661 /* ioctl calls. Shouldn't even need touching */
662 /* Device configuration ioctl calls */
663 static int atif_ioctl(int cmd, void __user *arg)
664 {
665 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
666 struct ifreq atreq;
667 struct atalk_netrange *nr;
668 struct sockaddr_at *sa;
669 struct net_device *dev;
670 struct atalk_iface *atif;
671 int ct;
672 int limit;
673 struct rtentry rtdef;
674 int add_route;
675
676 if (copy_from_user(&atreq, arg, sizeof(atreq)))
677 return -EFAULT;
678
679 dev = __dev_get_by_name(&init_net, atreq.ifr_name);
680 if (!dev)
681 return -ENODEV;
682
683 sa = (struct sockaddr_at *)&atreq.ifr_addr;
684 atif = atalk_find_dev(dev);
685
686 switch (cmd) {
687 case SIOCSIFADDR:
688 if (!capable(CAP_NET_ADMIN))
689 return -EPERM;
690 if (sa->sat_family != AF_APPLETALK)
691 return -EINVAL;
692 if (dev->type != ARPHRD_ETHER &&
693 dev->type != ARPHRD_LOOPBACK &&
694 dev->type != ARPHRD_LOCALTLK &&
695 dev->type != ARPHRD_PPP)
696 return -EPROTONOSUPPORT;
697
698 nr = (struct atalk_netrange *)&sa->sat_zero[0];
699 add_route = 1;
700
701 /*
702 * if this is a point-to-point iface, and we already
703 * have an iface for this AppleTalk address, then we
704 * should not add a route
705 */
706 if ((dev->flags & IFF_POINTOPOINT) &&
707 atalk_find_interface(sa->sat_addr.s_net,
708 sa->sat_addr.s_node)) {
709 printk(KERN_DEBUG "AppleTalk: point-to-point "
710 "interface added with "
711 "existing address\n");
712 add_route = 0;
713 }
714
715 /*
716 * Phase 1 is fine on LocalTalk but we don't do
717 * EtherTalk phase 1. Anyone wanting to add it go ahead.
718 */
719 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
720 return -EPROTONOSUPPORT;
721 if (sa->sat_addr.s_node == ATADDR_BCAST ||
722 sa->sat_addr.s_node == 254)
723 return -EINVAL;
724 if (atif) {
725 /* Already setting address */
726 if (atif->status & ATIF_PROBE)
727 return -EBUSY;
728
729 atif->address.s_net = sa->sat_addr.s_net;
730 atif->address.s_node = sa->sat_addr.s_node;
731 atrtr_device_down(dev); /* Flush old routes */
732 } else {
733 atif = atif_add_device(dev, &sa->sat_addr);
734 if (!atif)
735 return -ENOMEM;
736 }
737 atif->nets = *nr;
738
739 /*
740 * Check if the chosen address is used. If so we
741 * error and atalkd will try another.
742 */
743
744 if (!(dev->flags & IFF_LOOPBACK) &&
745 !(dev->flags & IFF_POINTOPOINT) &&
746 atif_probe_device(atif) < 0) {
747 atif_drop_device(dev);
748 return -EADDRINUSE;
749 }
750
751 /* Hey it worked - add the direct routes */
752 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
753 sa->sat_family = AF_APPLETALK;
754 sa->sat_addr.s_net = atif->address.s_net;
755 sa->sat_addr.s_node = atif->address.s_node;
756 sa = (struct sockaddr_at *)&rtdef.rt_dst;
757 rtdef.rt_flags = RTF_UP;
758 sa->sat_family = AF_APPLETALK;
759 sa->sat_addr.s_node = ATADDR_ANYNODE;
760 if (dev->flags & IFF_LOOPBACK ||
761 dev->flags & IFF_POINTOPOINT)
762 rtdef.rt_flags |= RTF_HOST;
763
764 /* Routerless initial state */
765 if (nr->nr_firstnet == htons(0) &&
766 nr->nr_lastnet == htons(0xFFFE)) {
767 sa->sat_addr.s_net = atif->address.s_net;
768 atrtr_create(&rtdef, dev);
769 atrtr_set_default(dev);
770 } else {
771 limit = ntohs(nr->nr_lastnet);
772 if (limit - ntohs(nr->nr_firstnet) > 4096) {
773 printk(KERN_WARNING "Too many routes/"
774 "iface.\n");
775 return -EINVAL;
776 }
777 if (add_route)
778 for (ct = ntohs(nr->nr_firstnet);
779 ct <= limit; ct++) {
780 sa->sat_addr.s_net = htons(ct);
781 atrtr_create(&rtdef, dev);
782 }
783 }
784 dev_mc_add(dev, aarp_mcast, 6, 1);
785 return 0;
786
787 case SIOCGIFADDR:
788 if (!atif)
789 return -EADDRNOTAVAIL;
790
791 sa->sat_family = AF_APPLETALK;
792 sa->sat_addr = atif->address;
793 break;
794
795 case SIOCGIFBRDADDR:
796 if (!atif)
797 return -EADDRNOTAVAIL;
798
799 sa->sat_family = AF_APPLETALK;
800 sa->sat_addr.s_net = atif->address.s_net;
801 sa->sat_addr.s_node = ATADDR_BCAST;
802 break;
803
804 case SIOCATALKDIFADDR:
805 case SIOCDIFADDR:
806 if (!capable(CAP_NET_ADMIN))
807 return -EPERM;
808 if (sa->sat_family != AF_APPLETALK)
809 return -EINVAL;
810 atalk_dev_down(dev);
811 break;
812
813 case SIOCSARP:
814 if (!capable(CAP_NET_ADMIN))
815 return -EPERM;
816 if (sa->sat_family != AF_APPLETALK)
817 return -EINVAL;
818 if (!atif)
819 return -EADDRNOTAVAIL;
820
821 /*
822 * for now, we only support proxy AARP on ELAP;
823 * we should be able to do it for LocalTalk, too.
824 */
825 if (dev->type != ARPHRD_ETHER)
826 return -EPROTONOSUPPORT;
827
828 /*
829 * atif points to the current interface on this network;
830 * we aren't concerned about its current status (at
831 * least for now), but it has all the settings about
832 * the network we're going to probe. Consequently, it
833 * must exist.
834 */
835 if (!atif)
836 return -EADDRNOTAVAIL;
837
838 nr = (struct atalk_netrange *)&(atif->nets);
839 /*
840 * Phase 1 is fine on Localtalk but we don't do
841 * Ethertalk phase 1. Anyone wanting to add it go ahead.
842 */
843 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
844 return -EPROTONOSUPPORT;
845
846 if (sa->sat_addr.s_node == ATADDR_BCAST ||
847 sa->sat_addr.s_node == 254)
848 return -EINVAL;
849
850 /*
851 * Check if the chosen address is used. If so we
852 * error and ATCP will try another.
853 */
854 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
855 return -EADDRINUSE;
856
857 /*
858 * We now have an address on the local network, and
859 * the AARP code will defend it for us until we take it
860 * down. We don't set up any routes right now, because
861 * ATCP will install them manually via SIOCADDRT.
862 */
863 break;
864
865 case SIOCDARP:
866 if (!capable(CAP_NET_ADMIN))
867 return -EPERM;
868 if (sa->sat_family != AF_APPLETALK)
869 return -EINVAL;
870 if (!atif)
871 return -EADDRNOTAVAIL;
872
873 /* give to aarp module to remove proxy entry */
874 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
875 return 0;
876 }
877
878 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
879 }
880
881 /* Routing ioctl() calls */
882 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
883 {
884 struct rtentry rt;
885
886 if (copy_from_user(&rt, arg, sizeof(rt)))
887 return -EFAULT;
888
889 switch (cmd) {
890 case SIOCDELRT:
891 if (rt.rt_dst.sa_family != AF_APPLETALK)
892 return -EINVAL;
893 return atrtr_delete(&((struct sockaddr_at *)
894 &rt.rt_dst)->sat_addr);
895
896 case SIOCADDRT: {
897 struct net_device *dev = NULL;
898 if (rt.rt_dev) {
899 char name[IFNAMSIZ];
900 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
901 return -EFAULT;
902 name[IFNAMSIZ-1] = '\0';
903 dev = __dev_get_by_name(&init_net, name);
904 if (!dev)
905 return -ENODEV;
906 }
907 return atrtr_create(&rt, dev);
908 }
909 }
910 return -EINVAL;
911 }
912
913 /**************************************************************************\
914 * *
915 * Handling for system calls applied via the various interfaces to an *
916 * AppleTalk socket object. *
917 * *
918 \**************************************************************************/
919
920 /*
921 * Checksum: This is 'optional'. It's quite likely also a good
922 * candidate for assembler hackery 8)
923 */
924 static unsigned long atalk_sum_partial(const unsigned char *data,
925 int len, unsigned long sum)
926 {
927 /* This ought to be unwrapped neatly. I'll trust gcc for now */
928 while (len--) {
929 sum += *data;
930 sum <<= 1;
931 if (sum & 0x10000) {
932 sum++;
933 sum &= 0xffff;
934 }
935 data++;
936 }
937 return sum;
938 }
939
940 /* Checksum skb data -- similar to skb_checksum */
941 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
942 int len, unsigned long sum)
943 {
944 int start = skb_headlen(skb);
945 int i, copy;
946
947 /* checksum stuff in header space */
948 if ( (copy = start - offset) > 0) {
949 if (copy > len)
950 copy = len;
951 sum = atalk_sum_partial(skb->data + offset, copy, sum);
952 if ( (len -= copy) == 0)
953 return sum;
954
955 offset += copy;
956 }
957
958 /* checksum stuff in frags */
959 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
960 int end;
961
962 BUG_TRAP(start <= offset + len);
963
964 end = start + skb_shinfo(skb)->frags[i].size;
965 if ((copy = end - offset) > 0) {
966 u8 *vaddr;
967 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
968
969 if (copy > len)
970 copy = len;
971 vaddr = kmap_skb_frag(frag);
972 sum = atalk_sum_partial(vaddr + frag->page_offset +
973 offset - start, copy, sum);
974 kunmap_skb_frag(vaddr);
975
976 if (!(len -= copy))
977 return sum;
978 offset += copy;
979 }
980 start = end;
981 }
982
983 if (skb_shinfo(skb)->frag_list) {
984 struct sk_buff *list = skb_shinfo(skb)->frag_list;
985
986 for (; list; list = list->next) {
987 int end;
988
989 BUG_TRAP(start <= offset + len);
990
991 end = start + list->len;
992 if ((copy = end - offset) > 0) {
993 if (copy > len)
994 copy = len;
995 sum = atalk_sum_skb(list, offset - start,
996 copy, sum);
997 if ((len -= copy) == 0)
998 return sum;
999 offset += copy;
1000 }
1001 start = end;
1002 }
1003 }
1004
1005 BUG_ON(len > 0);
1006
1007 return sum;
1008 }
1009
1010 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1011 {
1012 unsigned long sum;
1013
1014 /* skip header 4 bytes */
1015 sum = atalk_sum_skb(skb, 4, len-4, 0);
1016
1017 /* Use 0xFFFF for 0. 0 itself means none */
1018 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1019 }
1020
1021 static struct proto ddp_proto = {
1022 .name = "DDP",
1023 .owner = THIS_MODULE,
1024 .obj_size = sizeof(struct atalk_sock),
1025 };
1026
1027 /*
1028 * Create a socket. Initialise the socket, blank the addresses
1029 * set the state.
1030 */
1031 static int atalk_create(struct net *net, struct socket *sock, int protocol)
1032 {
1033 struct sock *sk;
1034 int rc = -ESOCKTNOSUPPORT;
1035
1036 if (net != &init_net)
1037 return -EAFNOSUPPORT;
1038
1039 /*
1040 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1041 * and gives you the full ELAP frame. Should be handy for CAP 8)
1042 */
1043 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1044 goto out;
1045 rc = -ENOMEM;
1046 sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto);
1047 if (!sk)
1048 goto out;
1049 rc = 0;
1050 sock->ops = &atalk_dgram_ops;
1051 sock_init_data(sock, sk);
1052
1053 /* Checksums on by default */
1054 sock_set_flag(sk, SOCK_ZAPPED);
1055 out:
1056 return rc;
1057 }
1058
1059 /* Free a socket. No work needed */
1060 static int atalk_release(struct socket *sock)
1061 {
1062 struct sock *sk = sock->sk;
1063
1064 if (sk) {
1065 sock_orphan(sk);
1066 sock->sk = NULL;
1067 atalk_destroy_socket(sk);
1068 }
1069 return 0;
1070 }
1071
1072 /**
1073 * atalk_pick_and_bind_port - Pick a source port when one is not given
1074 * @sk - socket to insert into the tables
1075 * @sat - address to search for
1076 *
1077 * Pick a source port when one is not given. If we can find a suitable free
1078 * one, we insert the socket into the tables using it.
1079 *
1080 * This whole operation must be atomic.
1081 */
1082 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1083 {
1084 int retval;
1085
1086 write_lock_bh(&atalk_sockets_lock);
1087
1088 for (sat->sat_port = ATPORT_RESERVED;
1089 sat->sat_port < ATPORT_LAST;
1090 sat->sat_port++) {
1091 struct sock *s;
1092 struct hlist_node *node;
1093
1094 sk_for_each(s, node, &atalk_sockets) {
1095 struct atalk_sock *at = at_sk(s);
1096
1097 if (at->src_net == sat->sat_addr.s_net &&
1098 at->src_node == sat->sat_addr.s_node &&
1099 at->src_port == sat->sat_port)
1100 goto try_next_port;
1101 }
1102
1103 /* Wheee, it's free, assign and insert. */
1104 __atalk_insert_socket(sk);
1105 at_sk(sk)->src_port = sat->sat_port;
1106 retval = 0;
1107 goto out;
1108
1109 try_next_port:;
1110 }
1111
1112 retval = -EBUSY;
1113 out:
1114 write_unlock_bh(&atalk_sockets_lock);
1115 return retval;
1116 }
1117
1118 static int atalk_autobind(struct sock *sk)
1119 {
1120 struct atalk_sock *at = at_sk(sk);
1121 struct sockaddr_at sat;
1122 struct atalk_addr *ap = atalk_find_primary();
1123 int n = -EADDRNOTAVAIL;
1124
1125 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1126 goto out;
1127
1128 at->src_net = sat.sat_addr.s_net = ap->s_net;
1129 at->src_node = sat.sat_addr.s_node = ap->s_node;
1130
1131 n = atalk_pick_and_bind_port(sk, &sat);
1132 if (!n)
1133 sock_reset_flag(sk, SOCK_ZAPPED);
1134 out:
1135 return n;
1136 }
1137
1138 /* Set the address 'our end' of the connection */
1139 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1140 {
1141 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1142 struct sock *sk = sock->sk;
1143 struct atalk_sock *at = at_sk(sk);
1144
1145 if (!sock_flag(sk, SOCK_ZAPPED) ||
1146 addr_len != sizeof(struct sockaddr_at))
1147 return -EINVAL;
1148
1149 if (addr->sat_family != AF_APPLETALK)
1150 return -EAFNOSUPPORT;
1151
1152 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1153 struct atalk_addr *ap = atalk_find_primary();
1154
1155 if (!ap)
1156 return -EADDRNOTAVAIL;
1157
1158 at->src_net = addr->sat_addr.s_net = ap->s_net;
1159 at->src_node = addr->sat_addr.s_node= ap->s_node;
1160 } else {
1161 if (!atalk_find_interface(addr->sat_addr.s_net,
1162 addr->sat_addr.s_node))
1163 return -EADDRNOTAVAIL;
1164
1165 at->src_net = addr->sat_addr.s_net;
1166 at->src_node = addr->sat_addr.s_node;
1167 }
1168
1169 if (addr->sat_port == ATADDR_ANYPORT) {
1170 int n = atalk_pick_and_bind_port(sk, addr);
1171
1172 if (n < 0)
1173 return n;
1174 } else {
1175 at->src_port = addr->sat_port;
1176
1177 if (atalk_find_or_insert_socket(sk, addr))
1178 return -EADDRINUSE;
1179 }
1180
1181 sock_reset_flag(sk, SOCK_ZAPPED);
1182 return 0;
1183 }
1184
1185 /* Set the address we talk to */
1186 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1187 int addr_len, int flags)
1188 {
1189 struct sock *sk = sock->sk;
1190 struct atalk_sock *at = at_sk(sk);
1191 struct sockaddr_at *addr;
1192
1193 sk->sk_state = TCP_CLOSE;
1194 sock->state = SS_UNCONNECTED;
1195
1196 if (addr_len != sizeof(*addr))
1197 return -EINVAL;
1198
1199 addr = (struct sockaddr_at *)uaddr;
1200
1201 if (addr->sat_family != AF_APPLETALK)
1202 return -EAFNOSUPPORT;
1203
1204 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1205 !sock_flag(sk, SOCK_BROADCAST)) {
1206 #if 1
1207 printk(KERN_WARNING "%s is broken and did not set "
1208 "SO_BROADCAST. It will break when 2.2 is "
1209 "released.\n",
1210 current->comm);
1211 #else
1212 return -EACCES;
1213 #endif
1214 }
1215
1216 if (sock_flag(sk, SOCK_ZAPPED))
1217 if (atalk_autobind(sk) < 0)
1218 return -EBUSY;
1219
1220 if (!atrtr_get_dev(&addr->sat_addr))
1221 return -ENETUNREACH;
1222
1223 at->dest_port = addr->sat_port;
1224 at->dest_net = addr->sat_addr.s_net;
1225 at->dest_node = addr->sat_addr.s_node;
1226
1227 sock->state = SS_CONNECTED;
1228 sk->sk_state = TCP_ESTABLISHED;
1229 return 0;
1230 }
1231
1232 /*
1233 * Find the name of an AppleTalk socket. Just copy the right
1234 * fields into the sockaddr.
1235 */
1236 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1237 int *uaddr_len, int peer)
1238 {
1239 struct sockaddr_at sat;
1240 struct sock *sk = sock->sk;
1241 struct atalk_sock *at = at_sk(sk);
1242
1243 if (sock_flag(sk, SOCK_ZAPPED))
1244 if (atalk_autobind(sk) < 0)
1245 return -ENOBUFS;
1246
1247 *uaddr_len = sizeof(struct sockaddr_at);
1248
1249 if (peer) {
1250 if (sk->sk_state != TCP_ESTABLISHED)
1251 return -ENOTCONN;
1252
1253 sat.sat_addr.s_net = at->dest_net;
1254 sat.sat_addr.s_node = at->dest_node;
1255 sat.sat_port = at->dest_port;
1256 } else {
1257 sat.sat_addr.s_net = at->src_net;
1258 sat.sat_addr.s_node = at->src_node;
1259 sat.sat_port = at->src_port;
1260 }
1261
1262 sat.sat_family = AF_APPLETALK;
1263 memcpy(uaddr, &sat, sizeof(sat));
1264 return 0;
1265 }
1266
1267 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1268 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1269 {
1270 return skb->data[12] == 22;
1271 }
1272
1273 static int handle_ip_over_ddp(struct sk_buff *skb)
1274 {
1275 struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
1276 struct net_device_stats *stats;
1277
1278 /* This needs to be able to handle ipddp"N" devices */
1279 if (!dev)
1280 return -ENODEV;
1281
1282 skb->protocol = htons(ETH_P_IP);
1283 skb_pull(skb, 13);
1284 skb->dev = dev;
1285 skb_reset_transport_header(skb);
1286
1287 stats = dev->priv;
1288 stats->rx_packets++;
1289 stats->rx_bytes += skb->len + 13;
1290 netif_rx(skb); /* Send the SKB up to a higher place. */
1291 return 0;
1292 }
1293 #else
1294 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1295 #define is_ip_over_ddp(skb) 0
1296 #define handle_ip_over_ddp(skb) 0
1297 #endif
1298
1299 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1300 struct ddpehdr *ddp, __u16 len_hops,
1301 int origlen)
1302 {
1303 struct atalk_route *rt;
1304 struct atalk_addr ta;
1305
1306 /*
1307 * Don't route multicast, etc., packets, or packets sent to "this
1308 * network"
1309 */
1310 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1311 /*
1312 * FIXME:
1313 *
1314 * Can it ever happen that a packet is from a PPP iface and
1315 * needs to be broadcast onto the default network?
1316 */
1317 if (dev->type == ARPHRD_PPP)
1318 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1319 "packet received from PPP iface\n");
1320 goto free_it;
1321 }
1322
1323 ta.s_net = ddp->deh_dnet;
1324 ta.s_node = ddp->deh_dnode;
1325
1326 /* Route the packet */
1327 rt = atrtr_find(&ta);
1328 /* increment hops count */
1329 len_hops += 1 << 10;
1330 if (!rt || !(len_hops & (15 << 10)))
1331 goto free_it;
1332
1333 /* FIXME: use skb->cb to be able to use shared skbs */
1334
1335 /*
1336 * Route goes through another gateway, so set the target to the
1337 * gateway instead.
1338 */
1339
1340 if (rt->flags & RTF_GATEWAY) {
1341 ta.s_net = rt->gateway.s_net;
1342 ta.s_node = rt->gateway.s_node;
1343 }
1344
1345 /* Fix up skb->len field */
1346 skb_trim(skb, min_t(unsigned int, origlen,
1347 (rt->dev->hard_header_len +
1348 ddp_dl->header_length + (len_hops & 1023))));
1349
1350 /* FIXME: use skb->cb to be able to use shared skbs */
1351 ddp->deh_len_hops = htons(len_hops);
1352
1353 /*
1354 * Send the buffer onwards
1355 *
1356 * Now we must always be careful. If it's come from LocalTalk to
1357 * EtherTalk it might not fit
1358 *
1359 * Order matters here: If a packet has to be copied to make a new
1360 * headroom (rare hopefully) then it won't need unsharing.
1361 *
1362 * Note. ddp-> becomes invalid at the realloc.
1363 */
1364 if (skb_headroom(skb) < 22) {
1365 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1366 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1367 kfree_skb(skb);
1368 if (!nskb)
1369 goto out;
1370 skb = nskb;
1371 } else
1372 skb = skb_unshare(skb, GFP_ATOMIC);
1373
1374 /*
1375 * If the buffer didn't vanish into the lack of space bitbucket we can
1376 * send it.
1377 */
1378 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1379 goto free_it;
1380 out:
1381 return;
1382 free_it:
1383 kfree_skb(skb);
1384 }
1385
1386 /**
1387 * atalk_rcv - Receive a packet (in skb) from device dev
1388 * @skb - packet received
1389 * @dev - network device where the packet comes from
1390 * @pt - packet type
1391 *
1392 * Receive a packet (in skb) from device dev. This has come from the SNAP
1393 * decoder, and on entry skb->transport_header is the DDP header, skb->len
1394 * is the DDP header, skb->len is the DDP length. The physical headers
1395 * have been extracted. PPP should probably pass frames marked as for this
1396 * layer. [ie ARPHRD_ETHERTALK]
1397 */
1398 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1399 struct packet_type *pt, struct net_device *orig_dev)
1400 {
1401 struct ddpehdr *ddp;
1402 struct sock *sock;
1403 struct atalk_iface *atif;
1404 struct sockaddr_at tosat;
1405 int origlen;
1406 __u16 len_hops;
1407
1408 if (dev->nd_net != &init_net)
1409 goto freeit;
1410
1411 /* Don't mangle buffer if shared */
1412 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1413 goto out;
1414
1415 /* Size check and make sure header is contiguous */
1416 if (!pskb_may_pull(skb, sizeof(*ddp)))
1417 goto freeit;
1418
1419 ddp = ddp_hdr(skb);
1420
1421 len_hops = ntohs(ddp->deh_len_hops);
1422
1423 /* Trim buffer in case of stray trailing data */
1424 origlen = skb->len;
1425 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1426
1427 /*
1428 * Size check to see if ddp->deh_len was crap
1429 * (Otherwise we'll detonate most spectacularly
1430 * in the middle of atalk_checksum() or recvmsg()).
1431 */
1432 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1433 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1434 "skb->len=%u)\n", len_hops & 1023, skb->len);
1435 goto freeit;
1436 }
1437
1438 /*
1439 * Any checksums. Note we don't do htons() on this == is assumed to be
1440 * valid for net byte orders all over the networking code...
1441 */
1442 if (ddp->deh_sum &&
1443 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1444 /* Not a valid AppleTalk frame - dustbin time */
1445 goto freeit;
1446
1447 /* Check the packet is aimed at us */
1448 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1449 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1450 else
1451 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1452
1453 if (!atif) {
1454 /* Not ours, so we route the packet via the correct
1455 * AppleTalk iface
1456 */
1457 atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1458 goto out;
1459 }
1460
1461 /* if IP over DDP is not selected this code will be optimized out */
1462 if (is_ip_over_ddp(skb))
1463 return handle_ip_over_ddp(skb);
1464 /*
1465 * Which socket - atalk_search_socket() looks for a *full match*
1466 * of the <net, node, port> tuple.
1467 */
1468 tosat.sat_addr.s_net = ddp->deh_dnet;
1469 tosat.sat_addr.s_node = ddp->deh_dnode;
1470 tosat.sat_port = ddp->deh_dport;
1471
1472 sock = atalk_search_socket(&tosat, atif);
1473 if (!sock) /* But not one of our sockets */
1474 goto freeit;
1475
1476 /* Queue packet (standard) */
1477 skb->sk = sock;
1478
1479 if (sock_queue_rcv_skb(sock, skb) < 0)
1480 goto freeit;
1481 out:
1482 return 0;
1483 freeit:
1484 kfree_skb(skb);
1485 goto out;
1486 }
1487
1488 /*
1489 * Receive a LocalTalk frame. We make some demands on the caller here.
1490 * Caller must provide enough headroom on the packet to pull the short
1491 * header and append a long one.
1492 */
1493 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1494 struct packet_type *pt, struct net_device *orig_dev)
1495 {
1496 if (dev->nd_net != &init_net)
1497 goto freeit;
1498
1499 /* Expand any short form frames */
1500 if (skb_mac_header(skb)[2] == 1) {
1501 struct ddpehdr *ddp;
1502 /* Find our address */
1503 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1504
1505 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1506 goto freeit;
1507
1508 /* Don't mangle buffer if shared */
1509 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1510 return 0;
1511
1512 /*
1513 * The push leaves us with a ddephdr not an shdr, and
1514 * handily the port bytes in the right place preset.
1515 */
1516 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1517
1518 /* Now fill in the long header */
1519
1520 /*
1521 * These two first. The mac overlays the new source/dest
1522 * network information so we MUST copy these before
1523 * we write the network numbers !
1524 */
1525
1526 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1527 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
1528
1529 ddp->deh_dnet = ap->s_net; /* Network number */
1530 ddp->deh_snet = ap->s_net;
1531 ddp->deh_sum = 0; /* No checksum */
1532 /*
1533 * Not sure about this bit...
1534 */
1535 /* Non routable, so force a drop if we slip up later */
1536 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1537 }
1538 skb_reset_transport_header(skb);
1539
1540 return atalk_rcv(skb, dev, pt, orig_dev);
1541 freeit:
1542 kfree_skb(skb);
1543 return 0;
1544 }
1545
1546 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1547 size_t len)
1548 {
1549 struct sock *sk = sock->sk;
1550 struct atalk_sock *at = at_sk(sk);
1551 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1552 int flags = msg->msg_flags;
1553 int loopback = 0;
1554 struct sockaddr_at local_satalk, gsat;
1555 struct sk_buff *skb;
1556 struct net_device *dev;
1557 struct ddpehdr *ddp;
1558 int size;
1559 struct atalk_route *rt;
1560 int err;
1561
1562 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1563 return -EINVAL;
1564
1565 if (len > DDP_MAXSZ)
1566 return -EMSGSIZE;
1567
1568 if (usat) {
1569 if (sock_flag(sk, SOCK_ZAPPED))
1570 if (atalk_autobind(sk) < 0)
1571 return -EBUSY;
1572
1573 if (msg->msg_namelen < sizeof(*usat) ||
1574 usat->sat_family != AF_APPLETALK)
1575 return -EINVAL;
1576
1577 /* netatalk doesn't implement this check */
1578 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1579 !sock_flag(sk, SOCK_BROADCAST)) {
1580 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1581 "it will break before 2.2\n");
1582 #if 0
1583 return -EPERM;
1584 #endif
1585 }
1586 } else {
1587 if (sk->sk_state != TCP_ESTABLISHED)
1588 return -ENOTCONN;
1589 usat = &local_satalk;
1590 usat->sat_family = AF_APPLETALK;
1591 usat->sat_port = at->dest_port;
1592 usat->sat_addr.s_node = at->dest_node;
1593 usat->sat_addr.s_net = at->dest_net;
1594 }
1595
1596 /* Build a packet */
1597 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1598
1599 /* For headers */
1600 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1601
1602 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1603 rt = atrtr_find(&usat->sat_addr);
1604 } else {
1605 struct atalk_addr at_hint;
1606
1607 at_hint.s_node = 0;
1608 at_hint.s_net = at->src_net;
1609
1610 rt = atrtr_find(&at_hint);
1611 }
1612 if (!rt)
1613 return -ENETUNREACH;
1614
1615 dev = rt->dev;
1616
1617 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1618 sk, size, dev->name);
1619
1620 size += dev->hard_header_len;
1621 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1622 if (!skb)
1623 return err;
1624
1625 skb->sk = sk;
1626 skb_reserve(skb, ddp_dl->header_length);
1627 skb_reserve(skb, dev->hard_header_len);
1628 skb->dev = dev;
1629
1630 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1631
1632 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1633 ddp->deh_len_hops = htons(len + sizeof(*ddp));
1634 ddp->deh_dnet = usat->sat_addr.s_net;
1635 ddp->deh_snet = at->src_net;
1636 ddp->deh_dnode = usat->sat_addr.s_node;
1637 ddp->deh_snode = at->src_node;
1638 ddp->deh_dport = usat->sat_port;
1639 ddp->deh_sport = at->src_port;
1640
1641 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1642
1643 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1644 if (err) {
1645 kfree_skb(skb);
1646 return -EFAULT;
1647 }
1648
1649 if (sk->sk_no_check == 1)
1650 ddp->deh_sum = 0;
1651 else
1652 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1653
1654 /*
1655 * Loopback broadcast packets to non gateway targets (ie routes
1656 * to group we are in)
1657 */
1658 if (ddp->deh_dnode == ATADDR_BCAST &&
1659 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1660 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1661
1662 if (skb2) {
1663 loopback = 1;
1664 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1665 if (aarp_send_ddp(dev, skb2,
1666 &usat->sat_addr, NULL) == -1)
1667 kfree_skb(skb2);
1668 /* else queued/sent above in the aarp queue */
1669 }
1670 }
1671
1672 if (dev->flags & IFF_LOOPBACK || loopback) {
1673 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1674 /* loop back */
1675 skb_orphan(skb);
1676 if (ddp->deh_dnode == ATADDR_BCAST) {
1677 struct atalk_addr at_lo;
1678
1679 at_lo.s_node = 0;
1680 at_lo.s_net = 0;
1681
1682 rt = atrtr_find(&at_lo);
1683 if (!rt) {
1684 kfree_skb(skb);
1685 return -ENETUNREACH;
1686 }
1687 dev = rt->dev;
1688 skb->dev = dev;
1689 }
1690 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1691 } else {
1692 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1693 if (rt->flags & RTF_GATEWAY) {
1694 gsat.sat_addr = rt->gateway;
1695 usat = &gsat;
1696 }
1697
1698 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1699 kfree_skb(skb);
1700 /* else queued/sent above in the aarp queue */
1701 }
1702 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1703
1704 return len;
1705 }
1706
1707 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1708 size_t size, int flags)
1709 {
1710 struct sock *sk = sock->sk;
1711 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1712 struct ddpehdr *ddp;
1713 int copied = 0;
1714 int offset = 0;
1715 int err = 0;
1716 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1717 flags & MSG_DONTWAIT, &err);
1718 if (!skb)
1719 return err;
1720
1721 /* FIXME: use skb->cb to be able to use shared skbs */
1722 ddp = ddp_hdr(skb);
1723 copied = ntohs(ddp->deh_len_hops) & 1023;
1724
1725 if (sk->sk_type != SOCK_RAW) {
1726 offset = sizeof(*ddp);
1727 copied -= offset;
1728 }
1729
1730 if (copied > size) {
1731 copied = size;
1732 msg->msg_flags |= MSG_TRUNC;
1733 }
1734 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1735
1736 if (!err) {
1737 if (sat) {
1738 sat->sat_family = AF_APPLETALK;
1739 sat->sat_port = ddp->deh_sport;
1740 sat->sat_addr.s_node = ddp->deh_snode;
1741 sat->sat_addr.s_net = ddp->deh_snet;
1742 }
1743 msg->msg_namelen = sizeof(*sat);
1744 }
1745
1746 skb_free_datagram(sk, skb); /* Free the datagram. */
1747 return err ? : copied;
1748 }
1749
1750
1751 /*
1752 * AppleTalk ioctl calls.
1753 */
1754 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1755 {
1756 int rc = -ENOIOCTLCMD;
1757 struct sock *sk = sock->sk;
1758 void __user *argp = (void __user *)arg;
1759
1760 switch (cmd) {
1761 /* Protocol layer */
1762 case TIOCOUTQ: {
1763 long amount = sk->sk_sndbuf -
1764 atomic_read(&sk->sk_wmem_alloc);
1765
1766 if (amount < 0)
1767 amount = 0;
1768 rc = put_user(amount, (int __user *)argp);
1769 break;
1770 }
1771 case TIOCINQ: {
1772 /*
1773 * These two are safe on a single CPU system as only
1774 * user tasks fiddle here
1775 */
1776 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1777 long amount = 0;
1778
1779 if (skb)
1780 amount = skb->len - sizeof(struct ddpehdr);
1781 rc = put_user(amount, (int __user *)argp);
1782 break;
1783 }
1784 case SIOCGSTAMP:
1785 rc = sock_get_timestamp(sk, argp);
1786 break;
1787 case SIOCGSTAMPNS:
1788 rc = sock_get_timestampns(sk, argp);
1789 break;
1790 /* Routing */
1791 case SIOCADDRT:
1792 case SIOCDELRT:
1793 rc = -EPERM;
1794 if (capable(CAP_NET_ADMIN))
1795 rc = atrtr_ioctl(cmd, argp);
1796 break;
1797 /* Interface */
1798 case SIOCGIFADDR:
1799 case SIOCSIFADDR:
1800 case SIOCGIFBRDADDR:
1801 case SIOCATALKDIFADDR:
1802 case SIOCDIFADDR:
1803 case SIOCSARP: /* proxy AARP */
1804 case SIOCDARP: /* proxy AARP */
1805 rtnl_lock();
1806 rc = atif_ioctl(cmd, argp);
1807 rtnl_unlock();
1808 break;
1809 }
1810
1811 return rc;
1812 }
1813
1814
1815 #ifdef CONFIG_COMPAT
1816 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1817 {
1818 /*
1819 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And
1820 * SIOCATALKDIFADDR is handled by upper layer as well, so there is
1821 * nothing to do. Eventually SIOCATALKDIFADDR should be moved
1822 * here so there is no generic SIOCPROTOPRIVATE translation in the
1823 * system.
1824 */
1825 return -ENOIOCTLCMD;
1826 }
1827 #endif
1828
1829
1830 static struct net_proto_family atalk_family_ops = {
1831 .family = PF_APPLETALK,
1832 .create = atalk_create,
1833 .owner = THIS_MODULE,
1834 };
1835
1836 static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1837 .family = PF_APPLETALK,
1838 .owner = THIS_MODULE,
1839 .release = atalk_release,
1840 .bind = atalk_bind,
1841 .connect = atalk_connect,
1842 .socketpair = sock_no_socketpair,
1843 .accept = sock_no_accept,
1844 .getname = atalk_getname,
1845 .poll = datagram_poll,
1846 .ioctl = atalk_ioctl,
1847 #ifdef CONFIG_COMPAT
1848 .compat_ioctl = atalk_compat_ioctl,
1849 #endif
1850 .listen = sock_no_listen,
1851 .shutdown = sock_no_shutdown,
1852 .setsockopt = sock_no_setsockopt,
1853 .getsockopt = sock_no_getsockopt,
1854 .sendmsg = atalk_sendmsg,
1855 .recvmsg = atalk_recvmsg,
1856 .mmap = sock_no_mmap,
1857 .sendpage = sock_no_sendpage,
1858 };
1859
1860 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1861
1862 static struct notifier_block ddp_notifier = {
1863 .notifier_call = ddp_device_event,
1864 };
1865
1866 static struct packet_type ltalk_packet_type = {
1867 .type = __constant_htons(ETH_P_LOCALTALK),
1868 .func = ltalk_rcv,
1869 };
1870
1871 static struct packet_type ppptalk_packet_type = {
1872 .type = __constant_htons(ETH_P_PPPTALK),
1873 .func = atalk_rcv,
1874 };
1875
1876 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1877
1878 /* Export symbols for use by drivers when AppleTalk is a module */
1879 EXPORT_SYMBOL(aarp_send_ddp);
1880 EXPORT_SYMBOL(atrtr_get_dev);
1881 EXPORT_SYMBOL(atalk_find_dev_addr);
1882
1883 static char atalk_err_snap[] __initdata =
1884 KERN_CRIT "Unable to register DDP with SNAP.\n";
1885
1886 /* Called by proto.c on kernel start up */
1887 static int __init atalk_init(void)
1888 {
1889 int rc = proto_register(&ddp_proto, 0);
1890
1891 if (rc != 0)
1892 goto out;
1893
1894 (void)sock_register(&atalk_family_ops);
1895 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1896 if (!ddp_dl)
1897 printk(atalk_err_snap);
1898
1899 dev_add_pack(&ltalk_packet_type);
1900 dev_add_pack(&ppptalk_packet_type);
1901
1902 register_netdevice_notifier(&ddp_notifier);
1903 aarp_proto_init();
1904 atalk_proc_init();
1905 atalk_register_sysctl();
1906 out:
1907 return rc;
1908 }
1909 module_init(atalk_init);
1910
1911 /*
1912 * No explicit module reference count manipulation is needed in the
1913 * protocol. Socket layer sets module reference count for us
1914 * and interfaces reference counting is done
1915 * by the network device layer.
1916 *
1917 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1918 * sockets be closed from user space.
1919 */
1920 static void __exit atalk_exit(void)
1921 {
1922 #ifdef CONFIG_SYSCTL
1923 atalk_unregister_sysctl();
1924 #endif /* CONFIG_SYSCTL */
1925 atalk_proc_exit();
1926 aarp_cleanup_module(); /* General aarp clean-up. */
1927 unregister_netdevice_notifier(&ddp_notifier);
1928 dev_remove_pack(&ltalk_packet_type);
1929 dev_remove_pack(&ppptalk_packet_type);
1930 unregister_snap_client(ddp_dl);
1931 sock_unregister(PF_APPLETALK);
1932 proto_unregister(&ddp_proto);
1933 }
1934 module_exit(atalk_exit);
1935
1936 MODULE_LICENSE("GPL");
1937 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1938 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1939 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
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