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[NET]: Make packet reception network namespace safe
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / appletalk / ddp.c
CommitLineData
1da177e4
LT		 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)
ed4477b9 31 * Jay Schulist : Made work as module with
1da177e4
LT		 32 * AppleTalk drivers, cleaned it.
33 * Rob Newberry : Added proxy AARP and AARP
34 * procfs, moved probing to AARP
35 * module.
ed4477b9
YH		 36 * Adrian Sun/
37 * Michael Zuelsdorff : fix for net.0 packets. don't
1da177e4 38 * allow illegal ether/tokentalk
ed4477b9
YH		 39 * port assignment. we lose a
40 * valid localtalk port as a
1da177e4
LT		 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.
ed4477b9 51 *
1da177e4
LT		 52 */
53
4fc268d2 54#include <linux/capability.h>
1da177e4 55#include <linux/module.h>
1da177e4
LT		 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>
c752f073 61#include <net/tcp_states.h>
1da177e4
LT		 62#include <net/route.h>
63#include <linux/atalk.h>
a1f8e7f7 64#include "../core/kmap_skb.h"
1da177e4
LT		 65
66struct datalink_proto *ddp_dl, *aarp_dl;
90ddc4f0 67static const struct proto_ops atalk_dgram_ops;
1da177e4
LT		 68
69/**************************************************************************\
70* *
71* Handlers for the socket list. *
72* *
73\**************************************************************************/
74
75HLIST_HEAD(atalk_sockets);
76DEFINE_RWLOCK(atalk_sockets_lock);
77
78static inline void __atalk_insert_socket(struct sock *sk)
79{
80 sk_add_node(sk, &atalk_sockets);
81}
82
83static 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
90static 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
ed4477b9 103 if (to->sat_addr.s_net == ATADDR_ANYNET &&
64233bff 104 to->sat_addr.s_node == ATADDR_BCAST)
1da177e4
LT		 105 goto found;
106
ed4477b9 107 if (to->sat_addr.s_net == at->src_net &&
1da177e4
LT		 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
ed4477b9 113 /* XXXX.0 -- we got a request for this router. make sure
1da177e4
LT		 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;
123found:
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 */
138static 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. */
156found:
157 write_unlock_bh(&atalk_sockets_lock);
158 return s;
159}
160
161static 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
173static inline void atalk_destroy_socket(struct sock *sk)
174{
175 atalk_remove_socket(sk);
176 skb_queue_purge(&sk->sk_receive_queue);
177
178 if (atomic_read(&sk->sk_wmem_alloc) ||
179 atomic_read(&sk->sk_rmem_alloc)) {
180 init_timer(&sk->sk_timer);
181 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
182 sk->sk_timer.function = atalk_destroy_timer;
183 sk->sk_timer.data = (unsigned long)sk;
184 add_timer(&sk->sk_timer);
185 } else
186 sock_put(sk);
187}
188
189/**************************************************************************\
190* *
191* Routing tables for the AppleTalk socket layer. *
192* *
193\**************************************************************************/
194
195/* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
196struct atalk_route *atalk_routes;
197DEFINE_RWLOCK(atalk_routes_lock);
198
199struct atalk_iface *atalk_interfaces;
200DEFINE_RWLOCK(atalk_interfaces_lock);
201
202/* For probing devices or in a routerless network */
203struct atalk_route atrtr_default;
204
205/* AppleTalk interface control */
206/*
207 * Drop a device. Doesn't drop any of its routes - that is the caller's
208 * problem. Called when we down the interface or delete the address.
209 */
210static void atif_drop_device(struct net_device *dev)
211{
212 struct atalk_iface **iface = &atalk_interfaces;
213 struct atalk_iface *tmp;
214
215 write_lock_bh(&atalk_interfaces_lock);
216 while ((tmp = *iface) != NULL) {
217 if (tmp->dev == dev) {
218 *iface = tmp->next;
219 dev_put(dev);
220 kfree(tmp);
221 dev->atalk_ptr = NULL;
222 } else
223 iface = &tmp->next;
224 }
225 write_unlock_bh(&atalk_interfaces_lock);
226}
227
228static struct atalk_iface *atif_add_device(struct net_device *dev,
229 struct atalk_addr *sa)
230{
0da974f4 231 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
1da177e4
LT		 232
233 if (!iface)
234 goto out;
235
1da177e4
LT		 236 dev_hold(dev);
237 iface->dev = dev;
238 dev->atalk_ptr = iface;
239 iface->address = *sa;
240 iface->status = 0;
241
242 write_lock_bh(&atalk_interfaces_lock);
243 iface->next = atalk_interfaces;
244 atalk_interfaces = iface;
245 write_unlock_bh(&atalk_interfaces_lock);
246out:
247 return iface;
248}
249
250/* Perform phase 2 AARP probing on our tentative address */
251static int atif_probe_device(struct atalk_iface *atif)
252{
253 int netrange = ntohs(atif->nets.nr_lastnet) -
254 ntohs(atif->nets.nr_firstnet) + 1;
255 int probe_net = ntohs(atif->address.s_net);
256 int probe_node = atif->address.s_node;
257 int netct, nodect;
258
259 /* Offset the network we start probing with */
260 if (probe_net == ATADDR_ANYNET) {
261 probe_net = ntohs(atif->nets.nr_firstnet);
262 if (netrange)
263 probe_net += jiffies % netrange;
264 }
265 if (probe_node == ATADDR_ANYNODE)
266 probe_node = jiffies & 0xFF;
267
268 /* Scan the networks */
269 atif->status |= ATIF_PROBE;
270 for (netct = 0; netct <= netrange; netct++) {
271 /* Sweep the available nodes from a given start */
272 atif->address.s_net = htons(probe_net);
273 for (nodect = 0; nodect < 256; nodect++) {
274 atif->address.s_node = (nodect + probe_node) & 0xFF;
275 if (atif->address.s_node > 0 &&
276 atif->address.s_node < 254) {
277 /* Probe a proposed address */
278 aarp_probe_network(atif);
279
280 if (!(atif->status & ATIF_PROBE_FAIL)) {
281 atif->status &= ~ATIF_PROBE;
282 return 0;
283 }
284 }
285 atif->status &= ~ATIF_PROBE_FAIL;
286 }
287 probe_net++;
288 if (probe_net > ntohs(atif->nets.nr_lastnet))
289 probe_net = ntohs(atif->nets.nr_firstnet);
290 }
291 atif->status &= ~ATIF_PROBE;
292
293 return -EADDRINUSE; /* Network is full... */
294}
295
296
297/* Perform AARP probing for a proxy address */
298static int atif_proxy_probe_device(struct atalk_iface *atif,
299 struct atalk_addr* proxy_addr)
300{
301 int netrange = ntohs(atif->nets.nr_lastnet) -
302 ntohs(atif->nets.nr_firstnet) + 1;
303 /* we probe the interface's network */
304 int probe_net = ntohs(atif->address.s_net);
305 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
306 int netct, nodect;
307
308 /* Offset the network we start probing with */
309 if (probe_net == ATADDR_ANYNET) {
310 probe_net = ntohs(atif->nets.nr_firstnet);
311 if (netrange)
312 probe_net += jiffies % netrange;
313 }
314
315 if (probe_node == ATADDR_ANYNODE)
316 probe_node = jiffies & 0xFF;
ed4477b9 317
1da177e4
LT		 318 /* Scan the networks */
319 for (netct = 0; netct <= netrange; netct++) {
320 /* Sweep the available nodes from a given start */
321 proxy_addr->s_net = htons(probe_net);
322 for (nodect = 0; nodect < 256; nodect++) {
323 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
324 if (proxy_addr->s_node > 0 &&
325 proxy_addr->s_node < 254) {
326 /* Tell AARP to probe a proposed address */
327 int ret = aarp_proxy_probe_network(atif,
328 proxy_addr);
329
330 if (ret != -EADDRINUSE)
331 return ret;
332 }
333 }
334 probe_net++;
335 if (probe_net > ntohs(atif->nets.nr_lastnet))
336 probe_net = ntohs(atif->nets.nr_firstnet);
337 }
338
339 return -EADDRINUSE; /* Network is full... */
340}
341
342
343struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
344{
345 struct atalk_iface *iface = dev->atalk_ptr;
346 return iface ? &iface->address : NULL;
347}
348
349static struct atalk_addr *atalk_find_primary(void)
350{
351 struct atalk_iface *fiface = NULL;
352 struct atalk_addr *retval;
353 struct atalk_iface *iface;
354
355 /*
356 * Return a point-to-point interface only if
357 * there is no non-ptp interface available.
358 */
359 read_lock_bh(&atalk_interfaces_lock);
360 for (iface = atalk_interfaces; iface; iface = iface->next) {
361 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
362 fiface = iface;
363 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
364 retval = &iface->address;
365 goto out;
366 }
367 }
368
369 if (fiface)
370 retval = &fiface->address;
371 else if (atalk_interfaces)
372 retval = &atalk_interfaces->address;
373 else
374 retval = NULL;
375out:
376 read_unlock_bh(&atalk_interfaces_lock);
377 return retval;
378}
379
380/*
381 * Find a match for 'any network' - ie any of our interfaces with that
382 * node number will do just nicely.
383 */
384static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
385{
386 struct atalk_iface *iface = dev->atalk_ptr;
387
388 if (!iface || iface->status & ATIF_PROBE)
389 goto out_err;
390
391 if (node != ATADDR_BCAST &&
392 iface->address.s_node != node &&
393 node != ATADDR_ANYNODE)
394 goto out_err;
395out:
396 return iface;
397out_err:
398 iface = NULL;
399 goto out;
400}
401
402/* Find a match for a specific network:node pair */
f6e276ee 403static struct atalk_iface *atalk_find_interface(__be16 net, int node)
1da177e4
LT		 404{
405 struct atalk_iface *iface;
406
407 read_lock_bh(&atalk_interfaces_lock);
408 for (iface = atalk_interfaces; iface; iface = iface->next) {
409 if ((node == ATADDR_BCAST ||
410 node == ATADDR_ANYNODE ||
411 iface->address.s_node == node) &&
412 iface->address.s_net == net &&
413 !(iface->status & ATIF_PROBE))
414 break;
415
416 /* XXXX.0 -- net.0 returns the iface associated with net */
417 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
418 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
419 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
ed4477b9 420 break;
1da177e4
LT		 421 }
422 read_unlock_bh(&atalk_interfaces_lock);
423 return iface;
424}
425
426
427/*
428 * Find a route for an AppleTalk packet. This ought to get cached in
429 * the socket (later on...). We know about host routes and the fact
430 * that a route must be direct to broadcast.
431 */
432static struct atalk_route *atrtr_find(struct atalk_addr *target)
433{
434 /*
ed4477b9 435 * we must search through all routes unless we find a
1da177e4
LT		 436 * host route, because some host routes might overlap
437 * network routes
438 */
439 struct atalk_route *net_route = NULL;
440 struct atalk_route *r;
ed4477b9 441
1da177e4
LT		 442 read_lock_bh(&atalk_routes_lock);
443 for (r = atalk_routes; r; r = r->next) {
444 if (!(r->flags & RTF_UP))
445 continue;
446
447 if (r->target.s_net == target->s_net) {
448 if (r->flags & RTF_HOST) {
449 /*
450 * if this host route is for the target,
451 * the we're done
452 */
453 if (r->target.s_node == target->s_node)
454 goto out;
455 } else
456 /*
457 * this route will work if there isn't a
458 * direct host route, so cache it
459 */
460 net_route = r;
461 }
462 }
ed4477b9
YH		 463
464 /*
1da177e4
LT		 465 * if we found a network route but not a direct host
466 * route, then return it
467 */
468 if (net_route)
469 r = net_route;
470 else if (atrtr_default.dev)
471 r = &atrtr_default;
472 else /* No route can be found */
473 r = NULL;
474out:
475 read_unlock_bh(&atalk_routes_lock);
476 return r;
477}
478
479
480/*
481 * Given an AppleTalk network, find the device to use. This can be
482 * a simple lookup.
483 */
484struct net_device *atrtr_get_dev(struct atalk_addr *sa)
485{
486 struct atalk_route *atr = atrtr_find(sa);
487 return atr ? atr->dev : NULL;
488}
489
490/* Set up a default router */
491static void atrtr_set_default(struct net_device *dev)
492{
493 atrtr_default.dev = dev;
494 atrtr_default.flags = RTF_UP;
495 atrtr_default.gateway.s_net = htons(0);
496 atrtr_default.gateway.s_node = 0;
497}
498
499/*
500 * Add a router. Basically make sure it looks valid and stuff the
501 * entry in the list. While it uses netranges we always set them to one
502 * entry to work like netatalk.
503 */
504static int atrtr_create(struct rtentry *r, struct net_device *devhint)
505{
506 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
507 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
508 struct atalk_route *rt;
509 struct atalk_iface *iface, *riface;
510 int retval = -EINVAL;
511
512 /*
513 * Fixme: Raise/Lower a routing change semaphore for these
514 * operations.
515 */
516
517 /* Validate the request */
518 if (ta->sat_family != AF_APPLETALK ||
519 (!devhint && ga->sat_family != AF_APPLETALK))
520 goto out;
521
522 /* Now walk the routing table and make our decisions */
523 write_lock_bh(&atalk_routes_lock);
524 for (rt = atalk_routes; rt; rt = rt->next) {
525 if (r->rt_flags != rt->flags)
526 continue;
527
528 if (ta->sat_addr.s_net == rt->target.s_net) {
529 if (!(rt->flags & RTF_HOST))
530 break;
531 if (ta->sat_addr.s_node == rt->target.s_node)
532 break;
533 }
534 }
535
536 if (!devhint) {
537 riface = NULL;
538
539 read_lock_bh(&atalk_interfaces_lock);
540 for (iface = atalk_interfaces; iface; iface = iface->next) {
541 if (!riface &&
542 ntohs(ga->sat_addr.s_net) >=
ed4477b9 543 ntohs(iface->nets.nr_firstnet) &&
1da177e4 544 ntohs(ga->sat_addr.s_net) <=
ed4477b9 545 ntohs(iface->nets.nr_lastnet))
1da177e4
LT		 546 riface = iface;
547
548 if (ga->sat_addr.s_net == iface->address.s_net &&
549 ga->sat_addr.s_node == iface->address.s_node)
550 riface = iface;
ed4477b9 551 }
1da177e4
LT		 552 read_unlock_bh(&atalk_interfaces_lock);
553
554 retval = -ENETUNREACH;
555 if (!riface)
556 goto out_unlock;
557
558 devhint = riface->dev;
559 }
560
561 if (!rt) {
0da974f4 562 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
1da177e4
LT		 563
564 retval = -ENOBUFS;
565 if (!rt)
566 goto out_unlock;
1da177e4
LT		 567
568 rt->next = atalk_routes;
569 atalk_routes = rt;
570 }
571
572 /* Fill in the routing entry */
573 rt->target = ta->sat_addr;
c7f905f0 574 dev_hold(devhint);
1da177e4
LT		 575 rt->dev = devhint;
576 rt->flags = r->rt_flags;
577 rt->gateway = ga->sat_addr;
578
579 retval = 0;
580out_unlock:
581 write_unlock_bh(&atalk_routes_lock);
582out:
583 return retval;
584}
585
586/* Delete a route. Find it and discard it */
587static int atrtr_delete(struct atalk_addr * addr)
588{
589 struct atalk_route **r = &atalk_routes;
590 int retval = 0;
591 struct atalk_route *tmp;
592
593 write_lock_bh(&atalk_routes_lock);
594 while ((tmp = *r) != NULL) {
595 if (tmp->target.s_net == addr->s_net &&
596 (!(tmp->flags&RTF_GATEWAY) ||
597 tmp->target.s_node == addr->s_node)) {
598 *r = tmp->next;
599 dev_put(tmp->dev);
600 kfree(tmp);
601 goto out;
602 }
603 r = &tmp->next;
604 }
605 retval = -ENOENT;
606out:
607 write_unlock_bh(&atalk_routes_lock);
608 return retval;
609}
610
611/*
612 * Called when a device is downed. Just throw away any routes
613 * via it.
614 */
615static void atrtr_device_down(struct net_device *dev)
616{
617 struct atalk_route **r = &atalk_routes;
618 struct atalk_route *tmp;
619
620 write_lock_bh(&atalk_routes_lock);
621 while ((tmp = *r) != NULL) {
622 if (tmp->dev == dev) {
623 *r = tmp->next;
624 dev_put(dev);
625 kfree(tmp);
626 } else
627 r = &tmp->next;
628 }
629 write_unlock_bh(&atalk_routes_lock);
630
631 if (atrtr_default.dev == dev)
632 atrtr_set_default(NULL);
633}
634
635/* Actually down the interface */
636static inline void atalk_dev_down(struct net_device *dev)
637{
638 atrtr_device_down(dev); /* Remove all routes for the device */
639 aarp_device_down(dev); /* Remove AARP entries for the device */
640 atif_drop_device(dev); /* Remove the device */
641}
642
643/*
644 * A device event has occurred. Watch for devices going down and
645 * delete our use of them (iface and route).
646 */
647static int ddp_device_event(struct notifier_block *this, unsigned long event,
648 void *ptr)
649{
890d52d3
EB		 650 struct net_device *dev = ptr;
651
1da177e4
LT		 652 if (event == NETDEV_DOWN)
653 /* Discard any use of this */
890d52d3 654 atalk_dev_down(dev);
1da177e4
LT		 655
656 return NOTIFY_DONE;
657}
658
659/* ioctl calls. Shouldn't even need touching */
660/* Device configuration ioctl calls */
661static int atif_ioctl(int cmd, void __user *arg)
662{
663 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
664 struct ifreq atreq;
665 struct atalk_netrange *nr;
666 struct sockaddr_at *sa;
667 struct net_device *dev;
668 struct atalk_iface *atif;
669 int ct;
670 int limit;
671 struct rtentry rtdef;
672 int add_route;
673
674 if (copy_from_user(&atreq, arg, sizeof(atreq)))
675 return -EFAULT;
676
677 dev = __dev_get_by_name(atreq.ifr_name);
678 if (!dev)
679 return -ENODEV;
680
681 sa = (struct sockaddr_at *)&atreq.ifr_addr;
682 atif = atalk_find_dev(dev);
683
684 switch (cmd) {
685 case SIOCSIFADDR:
686 if (!capable(CAP_NET_ADMIN))
687 return -EPERM;
688 if (sa->sat_family != AF_APPLETALK)
689 return -EINVAL;
690 if (dev->type != ARPHRD_ETHER &&
691 dev->type != ARPHRD_LOOPBACK &&
692 dev->type != ARPHRD_LOCALTLK &&
693 dev->type != ARPHRD_PPP)
694 return -EPROTONOSUPPORT;
695
696 nr = (struct atalk_netrange *)&sa->sat_zero[0];
697 add_route = 1;
698
699 /*
700 * if this is a point-to-point iface, and we already
701 * have an iface for this AppleTalk address, then we
702 * should not add a route
703 */
704 if ((dev->flags & IFF_POINTOPOINT) &&
705 atalk_find_interface(sa->sat_addr.s_net,
ed4477b9 706 sa->sat_addr.s_node)) {
1da177e4
LT		 707 printk(KERN_DEBUG "AppleTalk: point-to-point "
708 "interface added with "
709 "existing address\n");
710 add_route = 0;
711 }
ed4477b9 712
1da177e4
LT		 713 /*
714 * Phase 1 is fine on LocalTalk but we don't do
715 * EtherTalk phase 1. Anyone wanting to add it go ahead.
716 */
717 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
718 return -EPROTONOSUPPORT;
719 if (sa->sat_addr.s_node == ATADDR_BCAST ||
720 sa->sat_addr.s_node == 254)
721 return -EINVAL;
722 if (atif) {
723 /* Already setting address */
724 if (atif->status & ATIF_PROBE)
725 return -EBUSY;
726
727 atif->address.s_net = sa->sat_addr.s_net;
728 atif->address.s_node = sa->sat_addr.s_node;
729 atrtr_device_down(dev); /* Flush old routes */
730 } else {
731 atif = atif_add_device(dev, &sa->sat_addr);
732 if (!atif)
733 return -ENOMEM;
734 }
735 atif->nets = *nr;
736
737 /*
738 * Check if the chosen address is used. If so we
739 * error and atalkd will try another.
740 */
741
742 if (!(dev->flags & IFF_LOOPBACK) &&
743 !(dev->flags & IFF_POINTOPOINT) &&
744 atif_probe_device(atif) < 0) {
745 atif_drop_device(dev);
746 return -EADDRINUSE;
747 }
748
749 /* Hey it worked - add the direct routes */
750 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
751 sa->sat_family = AF_APPLETALK;
752 sa->sat_addr.s_net = atif->address.s_net;
753 sa->sat_addr.s_node = atif->address.s_node;
754 sa = (struct sockaddr_at *)&rtdef.rt_dst;
755 rtdef.rt_flags = RTF_UP;
756 sa->sat_family = AF_APPLETALK;
757 sa->sat_addr.s_node = ATADDR_ANYNODE;
758 if (dev->flags & IFF_LOOPBACK ||
759 dev->flags & IFF_POINTOPOINT)
760 rtdef.rt_flags |= RTF_HOST;
761
762 /* Routerless initial state */
763 if (nr->nr_firstnet == htons(0) &&
764 nr->nr_lastnet == htons(0xFFFE)) {
765 sa->sat_addr.s_net = atif->address.s_net;
766 atrtr_create(&rtdef, dev);
767 atrtr_set_default(dev);
768 } else {
769 limit = ntohs(nr->nr_lastnet);
770 if (limit - ntohs(nr->nr_firstnet) > 4096) {
771 printk(KERN_WARNING "Too many routes/"
772 "iface.\n");
773 return -EINVAL;
774 }
775 if (add_route)
776 for (ct = ntohs(nr->nr_firstnet);
777 ct <= limit; ct++) {
778 sa->sat_addr.s_net = htons(ct);
779 atrtr_create(&rtdef, dev);
780 }
781 }
782 dev_mc_add(dev, aarp_mcast, 6, 1);
783 return 0;
784
785 case SIOCGIFADDR:
786 if (!atif)
787 return -EADDRNOTAVAIL;
788
789 sa->sat_family = AF_APPLETALK;
790 sa->sat_addr = atif->address;
791 break;
792
793 case SIOCGIFBRDADDR:
794 if (!atif)
795 return -EADDRNOTAVAIL;
796
797 sa->sat_family = AF_APPLETALK;
798 sa->sat_addr.s_net = atif->address.s_net;
799 sa->sat_addr.s_node = ATADDR_BCAST;
800 break;
801
ed4477b9
YH		 802 case SIOCATALKDIFADDR:
803 case SIOCDIFADDR:
1da177e4
LT		 804 if (!capable(CAP_NET_ADMIN))
805 return -EPERM;
806 if (sa->sat_family != AF_APPLETALK)
807 return -EINVAL;
808 atalk_dev_down(dev);
ed4477b9 809 break;
1da177e4
LT		 810
811 case SIOCSARP:
812 if (!capable(CAP_NET_ADMIN))
ed4477b9
YH		 813 return -EPERM;
814 if (sa->sat_family != AF_APPLETALK)
815 return -EINVAL;
816 if (!atif)
817 return -EADDRNOTAVAIL;
818
819 /*
820 * for now, we only support proxy AARP on ELAP;
821 * we should be able to do it for LocalTalk, too.
822 */
823 if (dev->type != ARPHRD_ETHER)
824 return -EPROTONOSUPPORT;
825
826 /*
827 * atif points to the current interface on this network;
828 * we aren't concerned about its current status (at
1da177e4
LT		 829 * least for now), but it has all the settings about
830 * the network we're going to probe. Consequently, it
831 * must exist.
ed4477b9
YH		 832 */
833 if (!atif)
834 return -EADDRNOTAVAIL;
835
836 nr = (struct atalk_netrange *)&(atif->nets);
837 /*
838 * Phase 1 is fine on Localtalk but we don't do
839 * Ethertalk phase 1. Anyone wanting to add it go ahead.
840 */
841 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
842 return -EPROTONOSUPPORT;
843
844 if (sa->sat_addr.s_node == ATADDR_BCAST ||
1da177e4 845 sa->sat_addr.s_node == 254)
ed4477b9
YH		 846 return -EINVAL;
847
848 /*
849 * Check if the chosen address is used. If so we
850 * error and ATCP will try another.
851 */
852 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
853 return -EADDRINUSE;
854
1da177e4 855 /*
ed4477b9 856 * We now have an address on the local network, and
1da177e4
LT		 857 * the AARP code will defend it for us until we take it
858 * down. We don't set up any routes right now, because
859 * ATCP will install them manually via SIOCADDRT.
ed4477b9
YH		 860 */
861 break;
862
863 case SIOCDARP:
864 if (!capable(CAP_NET_ADMIN))
865 return -EPERM;
866 if (sa->sat_family != AF_APPLETALK)
867 return -EINVAL;
868 if (!atif)
869 return -EADDRNOTAVAIL;
870
871 /* give to aarp module to remove proxy entry */
872 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
873 return 0;
1da177e4
LT		 874 }
875
876 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
877}
878
879/* Routing ioctl() calls */
880static int atrtr_ioctl(unsigned int cmd, void __user *arg)
881{
882 struct rtentry rt;
883
884 if (copy_from_user(&rt, arg, sizeof(rt)))
885 return -EFAULT;
886
887 switch (cmd) {
888 case SIOCDELRT:
889 if (rt.rt_dst.sa_family != AF_APPLETALK)
890 return -EINVAL;
891 return atrtr_delete(&((struct sockaddr_at *)
892 &rt.rt_dst)->sat_addr);
893
894 case SIOCADDRT: {
895 struct net_device *dev = NULL;
896 if (rt.rt_dev) {
897 char name[IFNAMSIZ];
898 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
899 return -EFAULT;
900 name[IFNAMSIZ-1] = '\0';
901 dev = __dev_get_by_name(name);
902 if (!dev)
903 return -ENODEV;
ed4477b9 904 }
1da177e4
LT		 905 return atrtr_create(&rt, dev);
906 }
907 }
908 return -EINVAL;
909}
910
911/**************************************************************************\
912* *
913* Handling for system calls applied via the various interfaces to an *
914* AppleTalk socket object. *
915* *
916\**************************************************************************/
917
918/*
919 * Checksum: This is 'optional'. It's quite likely also a good
920 * candidate for assembler hackery 8)
921 */
ed4477b9 922static unsigned long atalk_sum_partial(const unsigned char *data,
1da177e4
LT		 923 int len, unsigned long sum)
924{
925 /* This ought to be unwrapped neatly. I'll trust gcc for now */
926 while (len--) {
927 sum += *data;
928 sum <<= 1;
929 if (sum & 0x10000) {
930 sum++;
931 sum &= 0xffff;
932 }
933 data++;
934 }
935 return sum;
936}
937
938/* Checksum skb data -- similar to skb_checksum */
939static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
940 int len, unsigned long sum)
941{
1a028e50 942 int start = skb_headlen(skb);
1da177e4
LT		 943 int i, copy;
944
945 /* checksum stuff in header space */
1a028e50 946 if ( (copy = start - offset) > 0) {
1da177e4
LT		 947 if (copy > len)
948 copy = len;
949 sum = atalk_sum_partial(skb->data + offset, copy, sum);
ed4477b9 950 if ( (len -= copy) == 0)
1da177e4
LT		 951 return sum;
952
953 offset += copy;
954 }
955
956 /* checksum stuff in frags */
957 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1a028e50 958 int end;
1da177e4 959
1a028e50
DM		 960 BUG_TRAP(start <= offset + len);
961
962 end = start + skb_shinfo(skb)->frags[i].size;
1da177e4
LT		 963 if ((copy = end - offset) > 0) {
964 u8 *vaddr;
965 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
966
967 if (copy > len)
968 copy = len;
969 vaddr = kmap_skb_frag(frag);
1a028e50
DM		 970 sum = atalk_sum_partial(vaddr + frag->page_offset +
971 offset - start, copy, sum);
1da177e4
LT		 972 kunmap_skb_frag(vaddr);
973
974 if (!(len -= copy))
975 return sum;
976 offset += copy;
977 }
1a028e50 978 start = end;
1da177e4
LT		 979 }
980
981 if (skb_shinfo(skb)->frag_list) {
982 struct sk_buff *list = skb_shinfo(skb)->frag_list;
983
984 for (; list; list = list->next) {
1a028e50
DM		 985 int end;
986
987 BUG_TRAP(start <= offset + len);
1da177e4 988
1a028e50 989 end = start + list->len;
1da177e4
LT		 990 if ((copy = end - offset) > 0) {
991 if (copy > len)
992 copy = len;
1a028e50
DM		 993 sum = atalk_sum_skb(list, offset - start,
994 copy, sum);
1da177e4
LT		 995 if ((len -= copy) == 0)
996 return sum;
997 offset += copy;
998 }
1a028e50 999 start = end;
1da177e4
LT		 1000 }
1001 }
1002
1003 BUG_ON(len > 0);
1004
1005 return sum;
1006}
1007
2a50f28c 1008static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1da177e4
LT		 1009{
1010 unsigned long sum;
1011
1012 /* skip header 4 bytes */
1013 sum = atalk_sum_skb(skb, 4, len-4, 0);
1014
1015 /* Use 0xFFFF for 0. 0 itself means none */
2a50f28c 1016 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1da177e4
LT		 1017}
1018
1019static struct proto ddp_proto = {
1020 .name = "DDP",
1021 .owner = THIS_MODULE,
1022 .obj_size = sizeof(struct atalk_sock),
1023};
1024
1025/*
1026 * Create a socket. Initialise the socket, blank the addresses
1027 * set the state.
1028 */
1b8d7ae4 1029static int atalk_create(struct net *net, struct socket *sock, int protocol)
1da177e4
LT		 1030{
1031 struct sock *sk;
1032 int rc = -ESOCKTNOSUPPORT;
1033
1b8d7ae4
EB		 1034 if (net != &init_net)
1035 return -EAFNOSUPPORT;
1036
1da177e4
LT		 1037 /*
1038 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
ed4477b9 1039 * and gives you the full ELAP frame. Should be handy for CAP 8)
1da177e4
LT		 1040 */
1041 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1042 goto out;
1043 rc = -ENOMEM;
1b8d7ae4 1044 sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1);
1da177e4
LT		 1045 if (!sk)
1046 goto out;
1047 rc = 0;
1048 sock->ops = &atalk_dgram_ops;
1049 sock_init_data(sock, sk);
1050
1051 /* Checksums on by default */
1052 sock_set_flag(sk, SOCK_ZAPPED);
1053out:
1054 return rc;
1055}
1056
1057/* Free a socket. No work needed */
1058static int atalk_release(struct socket *sock)
1059{
1060 struct sock *sk = sock->sk;
1061
1062 if (sk) {
1063 sock_orphan(sk);
1064 sock->sk = NULL;
1065 atalk_destroy_socket(sk);
1066 }
1067 return 0;
1068}
1069
1070/**
1071 * atalk_pick_and_bind_port - Pick a source port when one is not given
1072 * @sk - socket to insert into the tables
1073 * @sat - address to search for
1074 *
1075 * Pick a source port when one is not given. If we can find a suitable free
1076 * one, we insert the socket into the tables using it.
1077 *
1078 * This whole operation must be atomic.
1079 */
1080static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1081{
1082 int retval;
1083
1084 write_lock_bh(&atalk_sockets_lock);
1085
1086 for (sat->sat_port = ATPORT_RESERVED;
1087 sat->sat_port < ATPORT_LAST;
1088 sat->sat_port++) {
1089 struct sock *s;
1090 struct hlist_node *node;
1091
1092 sk_for_each(s, node, &atalk_sockets) {
1093 struct atalk_sock *at = at_sk(s);
1094
1095 if (at->src_net == sat->sat_addr.s_net &&
1096 at->src_node == sat->sat_addr.s_node &&
1097 at->src_port == sat->sat_port)
1098 goto try_next_port;
1099 }
1100
1101 /* Wheee, it's free, assign and insert. */
1102 __atalk_insert_socket(sk);
1103 at_sk(sk)->src_port = sat->sat_port;
1104 retval = 0;
1105 goto out;
1106
1107try_next_port:;
1108 }
1109
1110 retval = -EBUSY;
1111out:
1112 write_unlock_bh(&atalk_sockets_lock);
1113 return retval;
1114}
1115
1116static int atalk_autobind(struct sock *sk)
1117{
1118 struct atalk_sock *at = at_sk(sk);
1119 struct sockaddr_at sat;
1120 struct atalk_addr *ap = atalk_find_primary();
1121 int n = -EADDRNOTAVAIL;
1122
1123 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1124 goto out;
1125
1126 at->src_net = sat.sat_addr.s_net = ap->s_net;
1127 at->src_node = sat.sat_addr.s_node = ap->s_node;
1128
1129 n = atalk_pick_and_bind_port(sk, &sat);
1130 if (!n)
1131 sock_reset_flag(sk, SOCK_ZAPPED);
1132out:
1133 return n;
1134}
1135
1136/* Set the address 'our end' of the connection */
1137static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1138{
1139 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1140 struct sock *sk = sock->sk;
1141 struct atalk_sock *at = at_sk(sk);
1142
1143 if (!sock_flag(sk, SOCK_ZAPPED) ||
1144 addr_len != sizeof(struct sockaddr_at))
1145 return -EINVAL;
1146
1147 if (addr->sat_family != AF_APPLETALK)
1148 return -EAFNOSUPPORT;
1149
1150 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1151 struct atalk_addr *ap = atalk_find_primary();
1152
1153 if (!ap)
1154 return -EADDRNOTAVAIL;
1155
1156 at->src_net = addr->sat_addr.s_net = ap->s_net;
1157 at->src_node = addr->sat_addr.s_node= ap->s_node;
1158 } else {
1159 if (!atalk_find_interface(addr->sat_addr.s_net,
1160 addr->sat_addr.s_node))
1161 return -EADDRNOTAVAIL;
1162
1163 at->src_net = addr->sat_addr.s_net;
1164 at->src_node = addr->sat_addr.s_node;
1165 }
1166
1167 if (addr->sat_port == ATADDR_ANYPORT) {
1168 int n = atalk_pick_and_bind_port(sk, addr);
1169
1170 if (n < 0)
1171 return n;
1172 } else {
1173 at->src_port = addr->sat_port;
1174
1175 if (atalk_find_or_insert_socket(sk, addr))
1176 return -EADDRINUSE;
1177 }
1178
1179 sock_reset_flag(sk, SOCK_ZAPPED);
1180 return 0;
1181}
1182
1183/* Set the address we talk to */
1184static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1185 int addr_len, int flags)
1186{
1187 struct sock *sk = sock->sk;
1188 struct atalk_sock *at = at_sk(sk);
1189 struct sockaddr_at *addr;
1190
1191 sk->sk_state = TCP_CLOSE;
1192 sock->state = SS_UNCONNECTED;
1193
1194 if (addr_len != sizeof(*addr))
1195 return -EINVAL;
1196
1197 addr = (struct sockaddr_at *)uaddr;
1198
1199 if (addr->sat_family != AF_APPLETALK)
1200 return -EAFNOSUPPORT;
1201
1202 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1203 !sock_flag(sk, SOCK_BROADCAST)) {
ed4477b9 1204#if 1
1da177e4
LT		 1205 printk(KERN_WARNING "%s is broken and did not set "
1206 "SO_BROADCAST. It will break when 2.2 is "
1207 "released.\n",
1208 current->comm);
1209#else
1210 return -EACCES;
ed4477b9 1211#endif
1da177e4
LT		 1212 }
1213
1214 if (sock_flag(sk, SOCK_ZAPPED))
1215 if (atalk_autobind(sk) < 0)
1216 return -EBUSY;
1217
1218 if (!atrtr_get_dev(&addr->sat_addr))
1219 return -ENETUNREACH;
1220
1221 at->dest_port = addr->sat_port;
1222 at->dest_net = addr->sat_addr.s_net;
1223 at->dest_node = addr->sat_addr.s_node;
1224
1225 sock->state = SS_CONNECTED;
1226 sk->sk_state = TCP_ESTABLISHED;
1227 return 0;
1228}
1229
1230/*
1231 * Find the name of an AppleTalk socket. Just copy the right
1232 * fields into the sockaddr.
1233 */
1234static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1235 int *uaddr_len, int peer)
1236{
1237 struct sockaddr_at sat;
1238 struct sock *sk = sock->sk;
1239 struct atalk_sock *at = at_sk(sk);
1240
1241 if (sock_flag(sk, SOCK_ZAPPED))
1242 if (atalk_autobind(sk) < 0)
1243 return -ENOBUFS;
1244
1245 *uaddr_len = sizeof(struct sockaddr_at);
1246
1247 if (peer) {
1248 if (sk->sk_state != TCP_ESTABLISHED)
1249 return -ENOTCONN;
1250
1251 sat.sat_addr.s_net = at->dest_net;
1252 sat.sat_addr.s_node = at->dest_node;
1253 sat.sat_port = at->dest_port;
1254 } else {
1255 sat.sat_addr.s_net = at->src_net;
1256 sat.sat_addr.s_node = at->src_node;
1257 sat.sat_port = at->src_port;
1258 }
1259
1260 sat.sat_family = AF_APPLETALK;
1261 memcpy(uaddr, &sat, sizeof(sat));
1262 return 0;
1263}
1264
1265#if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1266static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1267{
ed4477b9 1268 return skb->data[12] == 22;
1da177e4
LT		 1269}
1270
1271static int handle_ip_over_ddp(struct sk_buff *skb)
1272{
ed4477b9 1273 struct net_device *dev = __dev_get_by_name("ipddp0");
1da177e4
LT		 1274 struct net_device_stats *stats;
1275
1276 /* This needs to be able to handle ipddp"N" devices */
ed4477b9
YH		 1277 if (!dev)
1278 return -ENODEV;
1da177e4 1279
ed4477b9
YH		 1280 skb->protocol = htons(ETH_P_IP);
1281 skb_pull(skb, 13);
1282 skb->dev = dev;
badff6d0 1283 skb_reset_transport_header(skb);
1da177e4
LT		 1284
1285 stats = dev->priv;
ed4477b9
YH		 1286 stats->rx_packets++;
1287 stats->rx_bytes += skb->len + 13;
1288 netif_rx(skb); /* Send the SKB up to a higher place. */
1da177e4
LT		 1289 return 0;
1290}
1291#else
1292/* make it easy for gcc to optimize this test out, i.e. kill the code */
1293#define is_ip_over_ddp(skb) 0
1294#define handle_ip_over_ddp(skb) 0
1295#endif
1296
1297static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
2a50f28c 1298 struct ddpehdr *ddp, __u16 len_hops,
1da177e4
LT		 1299 int origlen)
1300{
1301 struct atalk_route *rt;
1302 struct atalk_addr ta;
1303
1304 /*
1305 * Don't route multicast, etc., packets, or packets sent to "this
ed4477b9 1306 * network"
1da177e4
LT		 1307 */
1308 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1309 /*
1310 * FIXME:
1311 *
1312 * Can it ever happen that a packet is from a PPP iface and
1313 * needs to be broadcast onto the default network?
1314 */
1315 if (dev->type == ARPHRD_PPP)
1316 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1317 "packet received from PPP iface\n");
1318 goto free_it;
1319 }
1320
1321 ta.s_net = ddp->deh_dnet;
1322 ta.s_node = ddp->deh_dnode;
1323
1324 /* Route the packet */
1325 rt = atrtr_find(&ta);
2a50f28c
AV		 1326 /* increment hops count */
1327 len_hops += 1 << 10;
1328 if (!rt || !(len_hops & (15 << 10)))
1da177e4 1329 goto free_it;
2a50f28c 1330
1da177e4 1331 /* FIXME: use skb->cb to be able to use shared skbs */
1da177e4
LT		 1332
1333 /*
1334 * Route goes through another gateway, so set the target to the
1335 * gateway instead.
1336 */
1337
1338 if (rt->flags & RTF_GATEWAY) {
1339 ta.s_net = rt->gateway.s_net;
1340 ta.s_node = rt->gateway.s_node;
1341 }
1342
ed4477b9
YH		 1343 /* Fix up skb->len field */
1344 skb_trim(skb, min_t(unsigned int, origlen,
1da177e4 1345 (rt->dev->hard_header_len +
2a50f28c 1346 ddp_dl->header_length + (len_hops & 1023))));
1da177e4 1347
1da177e4 1348 /* FIXME: use skb->cb to be able to use shared skbs */
2a50f28c 1349 ddp->deh_len_hops = htons(len_hops);
1da177e4
LT		 1350
1351 /*
1352 * Send the buffer onwards
1353 *
1354 * Now we must always be careful. If it's come from LocalTalk to
1355 * EtherTalk it might not fit
1356 *
1357 * Order matters here: If a packet has to be copied to make a new
1358 * headroom (rare hopefully) then it won't need unsharing.
1359 *
1360 * Note. ddp-> becomes invalid at the realloc.
1361 */
1362 if (skb_headroom(skb) < 22) {
1363 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1364 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1365 kfree_skb(skb);
ed4477b9 1366 if (!nskb)
1da177e4
LT		 1367 goto out;
1368 skb = nskb;
1369 } else
1370 skb = skb_unshare(skb, GFP_ATOMIC);
ed4477b9 1371
1da177e4
LT		 1372 /*
1373 * If the buffer didn't vanish into the lack of space bitbucket we can
1374 * send it.
1375 */
1376 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1377 goto free_it;
1378out:
1379 return;
1380free_it:
1381 kfree_skb(skb);
1382}
1383
1384/**
1385 * atalk_rcv - Receive a packet (in skb) from device dev
1386 * @skb - packet received
1387 * @dev - network device where the packet comes from
1388 * @pt - packet type
1389 *
1390 * Receive a packet (in skb) from device dev. This has come from the SNAP
b0e380b1
ACM		 1391 * decoder, and on entry skb->transport_header is the DDP header, skb->len
1392 * is the DDP header, skb->len is the DDP length. The physical headers
1393 * have been extracted. PPP should probably pass frames marked as for this
1394 * layer. [ie ARPHRD_ETHERTALK]
1da177e4
LT		 1395 */
1396static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
f2ccd8fa 1397 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 1398{
1399 struct ddpehdr *ddp;
1400 struct sock *sock;
1401 struct atalk_iface *atif;
1402 struct sockaddr_at tosat;
ed4477b9 1403 int origlen;
2a50f28c 1404 __u16 len_hops;
1da177e4 1405
e730c155
EB		 1406 if (dev->nd_net != &init_net)
1407 goto freeit;
1408
1da177e4 1409 /* Don't mangle buffer if shared */
ed4477b9 1410 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1da177e4 1411 goto out;
ed4477b9 1412
1da177e4
LT		 1413 /* Size check and make sure header is contiguous */
1414 if (!pskb_may_pull(skb, sizeof(*ddp)))
1415 goto freeit;
1416
1417 ddp = ddp_hdr(skb);
1418
2a50f28c 1419 len_hops = ntohs(ddp->deh_len_hops);
1da177e4
LT		 1420
1421 /* Trim buffer in case of stray trailing data */
1422 origlen = skb->len;
2a50f28c 1423 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1da177e4
LT		 1424
1425 /*
1426 * Size check to see if ddp->deh_len was crap
1427 * (Otherwise we'll detonate most spectacularly
75559c16 1428 * in the middle of atalk_checksum() or recvmsg()).
1da177e4 1429 */
75559c16
JD		 1430 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1431 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1432 "skb->len=%u)\n", len_hops & 1023, skb->len);
1da177e4 1433 goto freeit;
75559c16 1434 }
1da177e4
LT		 1435
1436 /*
1437 * Any checksums. Note we don't do htons() on this == is assumed to be
1438 * valid for net byte orders all over the networking code...
1439 */
1440 if (ddp->deh_sum &&
2a50f28c 1441 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1da177e4
LT		 1442 /* Not a valid AppleTalk frame - dustbin time */
1443 goto freeit;
1444
1445 /* Check the packet is aimed at us */
1446 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1447 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1448 else
1449 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1450
1da177e4 1451 if (!atif) {
64233bff
OD		 1452 /* Not ours, so we route the packet via the correct
1453 * AppleTalk iface
1454 */
2a50f28c 1455 atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1da177e4
LT		 1456 goto out;
1457 }
1458
1459 /* if IP over DDP is not selected this code will be optimized out */
1460 if (is_ip_over_ddp(skb))
1461 return handle_ip_over_ddp(skb);
1462 /*
1463 * Which socket - atalk_search_socket() looks for a *full match*
1464 * of the <net, node, port> tuple.
1465 */
1466 tosat.sat_addr.s_net = ddp->deh_dnet;
1467 tosat.sat_addr.s_node = ddp->deh_dnode;
1468 tosat.sat_port = ddp->deh_dport;
1469
1470 sock = atalk_search_socket(&tosat, atif);
1471 if (!sock) /* But not one of our sockets */
1472 goto freeit;
1473
1474 /* Queue packet (standard) */
1475 skb->sk = sock;
1476
1477 if (sock_queue_rcv_skb(sock, skb) < 0)
1478 goto freeit;
1479out:
1480 return 0;
1481freeit:
1482 kfree_skb(skb);
1483 goto out;
1484}
1485
1486/*
1487 * Receive a LocalTalk frame. We make some demands on the caller here.
1488 * Caller must provide enough headroom on the packet to pull the short
1489 * header and append a long one.
1490 */
1491static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
f2ccd8fa 1492 struct packet_type *pt, struct net_device *orig_dev)
1da177e4 1493{
e730c155
EB		 1494 if (dev->nd_net != &init_net)
1495 goto freeit;
1496
1da177e4 1497 /* Expand any short form frames */
98e399f8 1498 if (skb_mac_header(skb)[2] == 1) {
1da177e4
LT		 1499 struct ddpehdr *ddp;
1500 /* Find our address */
1501 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1502
2a50f28c 1503 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1da177e4
LT		 1504 goto freeit;
1505
1506 /* Don't mangle buffer if shared */
ed4477b9 1507 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1da177e4
LT		 1508 return 0;
1509
1510 /*
1511 * The push leaves us with a ddephdr not an shdr, and
1512 * handily the port bytes in the right place preset.
1513 */
1514 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1515
1516 /* Now fill in the long header */
1517
ed4477b9
YH		 1518 /*
1519 * These two first. The mac overlays the new source/dest
1520 * network information so we MUST copy these before
1521 * we write the network numbers !
1522 */
1da177e4 1523
98e399f8
ACM		 1524 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1525 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
1da177e4
LT		 1526
1527 ddp->deh_dnet = ap->s_net; /* Network number */
1528 ddp->deh_snet = ap->s_net;
1529 ddp->deh_sum = 0; /* No checksum */
1530 /*
1531 * Not sure about this bit...
1532 */
2a50f28c
AV		 1533 /* Non routable, so force a drop if we slip up later */
1534 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1da177e4 1535 }
badff6d0 1536 skb_reset_transport_header(skb);
1da177e4 1537
f2ccd8fa 1538 return atalk_rcv(skb, dev, pt, orig_dev);
1da177e4
LT		 1539freeit:
1540 kfree_skb(skb);
1541 return 0;
1542}
1543
1544static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1545 size_t len)
1546{
1547 struct sock *sk = sock->sk;
1548 struct atalk_sock *at = at_sk(sk);
1549 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1550 int flags = msg->msg_flags;
1551 int loopback = 0;
1552 struct sockaddr_at local_satalk, gsat;
1553 struct sk_buff *skb;
1554 struct net_device *dev;
1555 struct ddpehdr *ddp;
1556 int size;
1557 struct atalk_route *rt;
1558 int err;
1559
1560 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1561 return -EINVAL;
1562
1563 if (len > DDP_MAXSZ)
1564 return -EMSGSIZE;
1565
1566 if (usat) {
1567 if (sock_flag(sk, SOCK_ZAPPED))
1568 if (atalk_autobind(sk) < 0)
1569 return -EBUSY;
1570
1571 if (msg->msg_namelen < sizeof(*usat) ||
1572 usat->sat_family != AF_APPLETALK)
1573 return -EINVAL;
1574
1575 /* netatalk doesn't implement this check */
1576 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1577 !sock_flag(sk, SOCK_BROADCAST)) {
1578 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1579 "it will break before 2.2\n");
1580#if 0
1581 return -EPERM;
1582#endif
1583 }
1584 } else {
1585 if (sk->sk_state != TCP_ESTABLISHED)
1586 return -ENOTCONN;
1587 usat = &local_satalk;
1588 usat->sat_family = AF_APPLETALK;
1589 usat->sat_port = at->dest_port;
1590 usat->sat_addr.s_node = at->dest_node;
1591 usat->sat_addr.s_net = at->dest_net;
1592 }
1593
1594 /* Build a packet */
1595 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1596
1597 /* For headers */
1598 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1599
1600 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1601 rt = atrtr_find(&usat->sat_addr);
1da177e4
LT		 1602 } else {
1603 struct atalk_addr at_hint;
1604
1605 at_hint.s_node = 0;
1606 at_hint.s_net = at->src_net;
1607
1608 rt = atrtr_find(&at_hint);
1da177e4 1609 }
64233bff
OD		 1610 if (!rt)
1611 return -ENETUNREACH;
1612
1613 dev = rt->dev;
1da177e4
LT		 1614
1615 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1616 sk, size, dev->name);
1617
1618 size += dev->hard_header_len;
1619 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1620 if (!skb)
1621 return err;
ed4477b9 1622
1da177e4
LT		 1623 skb->sk = sk;
1624 skb_reserve(skb, ddp_dl->header_length);
1625 skb_reserve(skb, dev->hard_header_len);
1626 skb->dev = dev;
1627
1628 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1629
1630 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
2a50f28c 1631 ddp->deh_len_hops = htons(len + sizeof(*ddp));
1da177e4
LT		 1632 ddp->deh_dnet = usat->sat_addr.s_net;
1633 ddp->deh_snet = at->src_net;
1634 ddp->deh_dnode = usat->sat_addr.s_node;
1635 ddp->deh_snode = at->src_node;
1636 ddp->deh_dport = usat->sat_port;
1637 ddp->deh_sport = at->src_port;
1638
1639 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1640
1641 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1642 if (err) {
1643 kfree_skb(skb);
1644 return -EFAULT;
1645 }
1646
1647 if (sk->sk_no_check == 1)
1648 ddp->deh_sum = 0;
1649 else
1650 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1651
1652 /*
1653 * Loopback broadcast packets to non gateway targets (ie routes
1654 * to group we are in)
1655 */
1656 if (ddp->deh_dnode == ATADDR_BCAST &&
1657 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1658 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1659
1660 if (skb2) {
1661 loopback = 1;
1662 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1663 if (aarp_send_ddp(dev, skb2,
1664 &usat->sat_addr, NULL) == -1)
1665 kfree_skb(skb2);
1666 /* else queued/sent above in the aarp queue */
1667 }
1668 }
1669
1670 if (dev->flags & IFF_LOOPBACK || loopback) {
1671 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1672 /* loop back */
1673 skb_orphan(skb);
64233bff
OD		 1674 if (ddp->deh_dnode == ATADDR_BCAST) {
1675 struct atalk_addr at_lo;
1676
1677 at_lo.s_node = 0;
1678 at_lo.s_net = 0;
1679
1680 rt = atrtr_find(&at_lo);
1681 if (!rt) {
1682 kfree_skb(skb);
1683 return -ENETUNREACH;
1684 }
1685 dev = rt->dev;
1686 skb->dev = dev;
1687 }
1da177e4
LT		 1688 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1689 } else {
1690 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1691 if (rt->flags & RTF_GATEWAY) {
1692 gsat.sat_addr = rt->gateway;
1693 usat = &gsat;
1694 }
1695
1696 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1697 kfree_skb(skb);
1698 /* else queued/sent above in the aarp queue */
1699 }
1700 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1701
1702 return len;
1703}
1704
1705static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1706 size_t size, int flags)
1707{
1708 struct sock *sk = sock->sk;
1709 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1710 struct ddpehdr *ddp;
1711 int copied = 0;
2a50f28c 1712 int offset = 0;
1da177e4 1713 int err = 0;
1da177e4
LT		 1714 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1715 flags & MSG_DONTWAIT, &err);
1716 if (!skb)
1717 return err;
1718
1719 /* FIXME: use skb->cb to be able to use shared skbs */
1720 ddp = ddp_hdr(skb);
2a50f28c 1721 copied = ntohs(ddp->deh_len_hops) & 1023;
1da177e4 1722
2a50f28c
AV		 1723 if (sk->sk_type != SOCK_RAW) {
1724 offset = sizeof(*ddp);
1725 copied -= offset;
1726 }
1da177e4 1727
2a50f28c
AV		 1728 if (copied > size) {
1729 copied = size;
1730 msg->msg_flags |= MSG_TRUNC;
1da177e4 1731 }
2a50f28c 1732 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1da177e4
LT		 1733
1734 if (!err) {
1735 if (sat) {
1736 sat->sat_family = AF_APPLETALK;
1737 sat->sat_port = ddp->deh_sport;
1738 sat->sat_addr.s_node = ddp->deh_snode;
1739 sat->sat_addr.s_net = ddp->deh_snet;
1740 }
1741 msg->msg_namelen = sizeof(*sat);
1742 }
1743
1744 skb_free_datagram(sk, skb); /* Free the datagram. */
1745 return err ? : copied;
1746}
1747
1748
1749/*
1750 * AppleTalk ioctl calls.
1751 */
1752static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1753{
b5e5fa5e 1754 int rc = -ENOIOCTLCMD;
1da177e4
LT		 1755 struct sock *sk = sock->sk;
1756 void __user *argp = (void __user *)arg;
1757
1758 switch (cmd) {
1759 /* Protocol layer */
1760 case TIOCOUTQ: {
1761 long amount = sk->sk_sndbuf -
1762 atomic_read(&sk->sk_wmem_alloc);
1763
1764 if (amount < 0)
1765 amount = 0;
1766 rc = put_user(amount, (int __user *)argp);
1767 break;
1768 }
1769 case TIOCINQ: {
1770 /*
1771 * These two are safe on a single CPU system as only
1772 * user tasks fiddle here
1773 */
1774 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1775 long amount = 0;
1776
1777 if (skb)
1778 amount = skb->len - sizeof(struct ddpehdr);
1779 rc = put_user(amount, (int __user *)argp);
1780 break;
1781 }
1782 case SIOCGSTAMP:
1783 rc = sock_get_timestamp(sk, argp);
1784 break;
ae40eb1e
ED		 1785 case SIOCGSTAMPNS:
1786 rc = sock_get_timestampns(sk, argp);
1787 break;
1da177e4
LT		 1788 /* Routing */
1789 case SIOCADDRT:
1790 case SIOCDELRT:
1791 rc = -EPERM;
1792 if (capable(CAP_NET_ADMIN))
1793 rc = atrtr_ioctl(cmd, argp);
1794 break;
1795 /* Interface */
1796 case SIOCGIFADDR:
1797 case SIOCSIFADDR:
1798 case SIOCGIFBRDADDR:
1799 case SIOCATALKDIFADDR:
1800 case SIOCDIFADDR:
1801 case SIOCSARP: /* proxy AARP */
1802 case SIOCDARP: /* proxy AARP */
1803 rtnl_lock();
1804 rc = atif_ioctl(cmd, argp);
1805 rtnl_unlock();
1806 break;
1da177e4
LT		 1807 }
1808
1809 return rc;
1810}
1811
f6c90b71
PV		 1812
1813#ifdef CONFIG_COMPAT
1814static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1815{
1816 /*
1817 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And
1818 * SIOCATALKDIFADDR is handled by upper layer as well, so there is
1819 * nothing to do. Eventually SIOCATALKDIFADDR should be moved
1820 * here so there is no generic SIOCPROTOPRIVATE translation in the
1821 * system.
1822 */
1823 return -ENOIOCTLCMD;
1824}
1825#endif
1826
1827
1da177e4
LT		 1828static struct net_proto_family atalk_family_ops = {
1829 .family = PF_APPLETALK,
1830 .create = atalk_create,
1831 .owner = THIS_MODULE,
1832};
1833
90ddc4f0 1834static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1da177e4
LT		 1835 .family = PF_APPLETALK,
1836 .owner = THIS_MODULE,
1837 .release = atalk_release,
1838 .bind = atalk_bind,
1839 .connect = atalk_connect,
1840 .socketpair = sock_no_socketpair,
1841 .accept = sock_no_accept,
1842 .getname = atalk_getname,
1843 .poll = datagram_poll,
1844 .ioctl = atalk_ioctl,
f6c90b71
PV		 1845#ifdef CONFIG_COMPAT
1846 .compat_ioctl = atalk_compat_ioctl,
1847#endif
1da177e4
LT		 1848 .listen = sock_no_listen,
1849 .shutdown = sock_no_shutdown,
1850 .setsockopt = sock_no_setsockopt,
1851 .getsockopt = sock_no_getsockopt,
1852 .sendmsg = atalk_sendmsg,
1853 .recvmsg = atalk_recvmsg,
1854 .mmap = sock_no_mmap,
1855 .sendpage = sock_no_sendpage,
1856};
1857
1da177e4
LT		 1858SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1859
1860static struct notifier_block ddp_notifier = {
1861 .notifier_call = ddp_device_event,
1862};
1863
1864static struct packet_type ltalk_packet_type = {
1865 .type = __constant_htons(ETH_P_LOCALTALK),
1866 .func = ltalk_rcv,
1867};
1868
1869static struct packet_type ppptalk_packet_type = {
1870 .type = __constant_htons(ETH_P_PPPTALK),
1871 .func = atalk_rcv,
1872};
1873
1874static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1875
1876/* Export symbols for use by drivers when AppleTalk is a module */
1877EXPORT_SYMBOL(aarp_send_ddp);
1878EXPORT_SYMBOL(atrtr_get_dev);
1879EXPORT_SYMBOL(atalk_find_dev_addr);
1880
1881static char atalk_err_snap[] __initdata =
1882 KERN_CRIT "Unable to register DDP with SNAP.\n";
1883
1884/* Called by proto.c on kernel start up */
1885static int __init atalk_init(void)
1886{
1887 int rc = proto_register(&ddp_proto, 0);
1888
1889 if (rc != 0)
1890 goto out;
1891
1892 (void)sock_register(&atalk_family_ops);
1893 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1894 if (!ddp_dl)
1895 printk(atalk_err_snap);
1896
1897 dev_add_pack(&ltalk_packet_type);
1898 dev_add_pack(&ppptalk_packet_type);
1899
1900 register_netdevice_notifier(&ddp_notifier);
1901 aarp_proto_init();
1902 atalk_proc_init();
1903 atalk_register_sysctl();
1904out:
1905 return rc;
1906}
1907module_init(atalk_init);
1908
1909/*
1910 * No explicit module reference count manipulation is needed in the
1911 * protocol. Socket layer sets module reference count for us
1912 * and interfaces reference counting is done
1913 * by the network device layer.
1914 *
1915 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1916 * sockets be closed from user space.
1917 */
1918static void __exit atalk_exit(void)
1919{
1920#ifdef CONFIG_SYSCTL
1921 atalk_unregister_sysctl();
1922#endif /* CONFIG_SYSCTL */
1923 atalk_proc_exit();
1924 aarp_cleanup_module(); /* General aarp clean-up. */
1925 unregister_netdevice_notifier(&ddp_notifier);
1926 dev_remove_pack(&ltalk_packet_type);
1927 dev_remove_pack(&ppptalk_packet_type);
1928 unregister_snap_client(ddp_dl);
1929 sock_unregister(PF_APPLETALK);
1930 proto_unregister(&ddp_proto);
1931}
1932module_exit(atalk_exit);
1933
1934MODULE_LICENSE("GPL");
1935MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1936MODULE_DESCRIPTION("AppleTalk 0.20\n");
1937MODULE_ALIAS_NETPROTO(PF_APPLETALK);
kernel source for telekom puls (alcatel/mediatek)