~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/appletalk/ddp.c

Version: ~ [ linux-5.0-rc6 ] ~ [ linux-4.20.10 ] ~ [ linux-4.19.23 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.101 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.158 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.174 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.134 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *      DDP:    An implementation of the AppleTalk DDP protocol for
  3  *              Ethernet 'ELAP'.
  4  *
  5  *              Alan Cox  <alan@lxorguk.ukuu.org.uk>
  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 <linux/compat.h>
 59 #include <linux/slab.h>
 60 #include <net/datalink.h>
 61 #include <net/psnap.h>
 62 #include <net/sock.h>
 63 #include <net/tcp_states.h>
 64 #include <net/route.h>
 65 #include <linux/atalk.h>
 66 #include "../core/kmap_skb.h"
 67 
 68 struct datalink_proto *ddp_dl, *aarp_dl;
 69 static const struct proto_ops atalk_dgram_ops;
 70 
 71 /**************************************************************************\
 72 *                                                                          *
 73 * Handlers for the socket list.                                            *
 74 *                                                                          *
 75 \**************************************************************************/
 76 
 77 HLIST_HEAD(atalk_sockets);
 78 DEFINE_RWLOCK(atalk_sockets_lock);
 79 
 80 static inline void __atalk_insert_socket(struct sock *sk)
 81 {
 82         sk_add_node(sk, &atalk_sockets);
 83 }
 84 
 85 static inline void atalk_remove_socket(struct sock *sk)
 86 {
 87         write_lock_bh(&atalk_sockets_lock);
 88         sk_del_node_init(sk);
 89         write_unlock_bh(&atalk_sockets_lock);
 90 }
 91 
 92 static struct sock *atalk_search_socket(struct sockaddr_at *to,
 93                                         struct atalk_iface *atif)
 94 {
 95         struct sock *s;
 96         struct hlist_node *node;
 97 
 98         read_lock_bh(&atalk_sockets_lock);
 99         sk_for_each(s, node, &atalk_sockets) {
100                 struct atalk_sock *at = at_sk(s);
101 
102                 if (to->sat_port != at->src_port)
103                         continue;
104 
105                 if (to->sat_addr.s_net == ATADDR_ANYNET &&
106                     to->sat_addr.s_node == ATADDR_BCAST)
107                         goto found;
108 
109                 if (to->sat_addr.s_net == at->src_net &&
110                     (to->sat_addr.s_node == at->src_node ||
111                      to->sat_addr.s_node == ATADDR_BCAST ||
112                      to->sat_addr.s_node == ATADDR_ANYNODE))
113                         goto found;
114 
115                 /* XXXX.0 -- we got a request for this router. make sure
116                  * that the node is appropriately set. */
117                 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
118                     to->sat_addr.s_net != ATADDR_ANYNET &&
119                     atif->address.s_node == at->src_node) {
120                         to->sat_addr.s_node = atif->address.s_node;
121                         goto found;
122                 }
123         }
124         s = NULL;
125 found:
126         read_unlock_bh(&atalk_sockets_lock);
127         return s;
128 }
129 
130 /**
131  * atalk_find_or_insert_socket - Try to find a socket matching ADDR
132  * @sk - socket to insert in the list if it is not there already
133  * @sat - address to search for
134  *
135  * Try to find a socket matching ADDR in the socket list, if found then return
136  * it. If not, insert SK into the socket list.
137  *
138  * This entire operation must execute atomically.
139  */
140 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
141                                                 struct sockaddr_at *sat)
142 {
143         struct sock *s;
144         struct hlist_node *node;
145         struct atalk_sock *at;
146 
147         write_lock_bh(&atalk_sockets_lock);
148         sk_for_each(s, node, &atalk_sockets) {
149                 at = at_sk(s);
150 
151                 if (at->src_net == sat->sat_addr.s_net &&
152                     at->src_node == sat->sat_addr.s_node &&
153                     at->src_port == sat->sat_port)
154                         goto found;
155         }
156         s = NULL;
157         __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
158 found:
159         write_unlock_bh(&atalk_sockets_lock);
160         return s;
161 }
162 
163 static void atalk_destroy_timer(unsigned long data)
164 {
165         struct sock *sk = (struct sock *)data;
166 
167         if (sk_has_allocations(sk)) {
168                 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
169                 add_timer(&sk->sk_timer);
170         } else
171                 sock_put(sk);
172 }
173 
174 static inline void atalk_destroy_socket(struct sock *sk)
175 {
176         atalk_remove_socket(sk);
177         skb_queue_purge(&sk->sk_receive_queue);
178 
179         if (sk_has_allocations(sk)) {
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 (!net_eq(dev_net(dev), &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_global(dev, aarp_mcast);
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                         /*
819                          * for now, we only support proxy AARP on ELAP;
820                          * we should be able to do it for LocalTalk, too.
821                          */
822                         if (dev->type != ARPHRD_ETHER)
823                                 return -EPROTONOSUPPORT;
824 
825                         /*
826                          * atif points to the current interface on this network;
827                          * we aren't concerned about its current status (at
828                          * least for now), but it has all the settings about
829                          * the network we're going to probe. Consequently, it
830                          * must exist.
831                          */
832                         if (!atif)
833                                 return -EADDRNOTAVAIL;
834 
835                         nr = (struct atalk_netrange *)&(atif->nets);
836                         /*
837                          * Phase 1 is fine on Localtalk but we don't do
838                          * Ethertalk phase 1. Anyone wanting to add it go ahead.
839                          */
840                         if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
841                                 return -EPROTONOSUPPORT;
842 
843                         if (sa->sat_addr.s_node == ATADDR_BCAST ||
844                             sa->sat_addr.s_node == 254)
845                                 return -EINVAL;
846 
847                         /*
848                          * Check if the chosen address is used. If so we
849                          * error and ATCP will try another.
850                          */
851                         if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
852                                 return -EADDRINUSE;
853 
854                         /*
855                          * We now have an address on the local network, and
856                          * the AARP code will defend it for us until we take it
857                          * down. We don't set up any routes right now, because
858                          * ATCP will install them manually via SIOCADDRT.
859                          */
860                         break;
861 
862                 case SIOCDARP:
863                         if (!capable(CAP_NET_ADMIN))
864                                 return -EPERM;
865                         if (sa->sat_family != AF_APPLETALK)
866                                 return -EINVAL;
867                         if (!atif)
868                                 return -EADDRNOTAVAIL;
869 
870                         /* give to aarp module to remove proxy entry */
871                         aarp_proxy_remove(atif->dev, &(sa->sat_addr));
872                         return 0;
873         }
874 
875         return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
876 }
877 
878 /* Routing ioctl() calls */
879 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
880 {
881         struct rtentry rt;
882 
883         if (copy_from_user(&rt, arg, sizeof(rt)))
884                 return -EFAULT;
885 
886         switch (cmd) {
887                 case SIOCDELRT:
888                         if (rt.rt_dst.sa_family != AF_APPLETALK)
889                                 return -EINVAL;
890                         return atrtr_delete(&((struct sockaddr_at *)
891                                                 &rt.rt_dst)->sat_addr);
892 
893                 case SIOCADDRT: {
894                         struct net_device *dev = NULL;
895                         if (rt.rt_dev) {
896                                 char name[IFNAMSIZ];
897                                 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
898                                         return -EFAULT;
899                                 name[IFNAMSIZ-1] = '\0';
900                                 dev = __dev_get_by_name(&init_net, name);
901                                 if (!dev)
902                                         return -ENODEV;
903                         }
904                         return atrtr_create(&rt, dev);
905                 }
906         }
907         return -EINVAL;
908 }
909 
910 /**************************************************************************\
911 *                                                                          *
912 * Handling for system calls applied via the various interfaces to an       *
913 * AppleTalk socket object.                                                 *
914 *                                                                          *
915 \**************************************************************************/
916 
917 /*
918  * Checksum: This is 'optional'. It's quite likely also a good
919  * candidate for assembler hackery 8)
920  */
921 static unsigned long atalk_sum_partial(const unsigned char *data,
922                                        int len, unsigned long sum)
923 {
924         /* This ought to be unwrapped neatly. I'll trust gcc for now */
925         while (len--) {
926                 sum += *data++;
927                 sum = rol16(sum, 1);
928         }
929         return sum;
930 }
931 
932 /*  Checksum skb data --  similar to skb_checksum  */
933 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
934                                    int len, unsigned long sum)
935 {
936         int start = skb_headlen(skb);
937         struct sk_buff *frag_iter;
938         int i, copy;
939 
940         /* checksum stuff in header space */
941         if ( (copy = start - offset) > 0) {
942                 if (copy > len)
943                         copy = len;
944                 sum = atalk_sum_partial(skb->data + offset, copy, sum);
945                 if ( (len -= copy) == 0)
946                         return sum;
947 
948                 offset += copy;
949         }
950 
951         /* checksum stuff in frags */
952         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
953                 int end;
954 
955                 WARN_ON(start > offset + len);
956 
957                 end = start + skb_shinfo(skb)->frags[i].size;
958                 if ((copy = end - offset) > 0) {
959                         u8 *vaddr;
960                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
961 
962                         if (copy > len)
963                                 copy = len;
964                         vaddr = kmap_skb_frag(frag);
965                         sum = atalk_sum_partial(vaddr + frag->page_offset +
966                                                   offset - start, copy, sum);
967                         kunmap_skb_frag(vaddr);
968 
969                         if (!(len -= copy))
970                                 return sum;
971                         offset += copy;
972                 }
973                 start = end;
974         }
975 
976         skb_walk_frags(skb, frag_iter) {
977                 int end;
978 
979                 WARN_ON(start > offset + len);
980 
981                 end = start + frag_iter->len;
982                 if ((copy = end - offset) > 0) {
983                         if (copy > len)
984                                 copy = len;
985                         sum = atalk_sum_skb(frag_iter, offset - start,
986                                             copy, sum);
987                         if ((len -= copy) == 0)
988                                 return sum;
989                         offset += copy;
990                 }
991                 start = end;
992         }
993 
994         BUG_ON(len > 0);
995 
996         return sum;
997 }
998 
999 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1000 {
1001         unsigned long sum;
1002 
1003         /* skip header 4 bytes */
1004         sum = atalk_sum_skb(skb, 4, len-4, 0);
1005 
1006         /* Use 0xFFFF for 0. 0 itself means none */
1007         return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1008 }
1009 
1010 static struct proto ddp_proto = {
1011         .name     = "DDP",
1012         .owner    = THIS_MODULE,
1013         .obj_size = sizeof(struct atalk_sock),
1014 };
1015 
1016 /*
1017  * Create a socket. Initialise the socket, blank the addresses
1018  * set the state.
1019  */
1020 static int atalk_create(struct net *net, struct socket *sock, int protocol,
1021                         int kern)
1022 {
1023         struct sock *sk;
1024         int rc = -ESOCKTNOSUPPORT;
1025 
1026         if (!net_eq(net, &init_net))
1027                 return -EAFNOSUPPORT;
1028 
1029         /*
1030          * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1031          * and gives you the full ELAP frame. Should be handy for CAP 8)
1032          */
1033         if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1034                 goto out;
1035         rc = -ENOMEM;
1036         sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto);
1037         if (!sk)
1038                 goto out;
1039         rc = 0;
1040         sock->ops = &atalk_dgram_ops;
1041         sock_init_data(sock, sk);
1042 
1043         /* Checksums on by default */
1044         sock_set_flag(sk, SOCK_ZAPPED);
1045 out:
1046         return rc;
1047 }
1048 
1049 /* Free a socket. No work needed */
1050 static int atalk_release(struct socket *sock)
1051 {
1052         struct sock *sk = sock->sk;
1053 
1054         if (sk) {
1055                 sock_hold(sk);
1056                 lock_sock(sk);
1057 
1058                 sock_orphan(sk);
1059                 sock->sk = NULL;
1060                 atalk_destroy_socket(sk);
1061 
1062                 release_sock(sk);
1063                 sock_put(sk);
1064         }
1065         return 0;
1066 }
1067 
1068 /**
1069  * atalk_pick_and_bind_port - Pick a source port when one is not given
1070  * @sk - socket to insert into the tables
1071  * @sat - address to search for
1072  *
1073  * Pick a source port when one is not given. If we can find a suitable free
1074  * one, we insert the socket into the tables using it.
1075  *
1076  * This whole operation must be atomic.
1077  */
1078 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1079 {
1080         int retval;
1081 
1082         write_lock_bh(&atalk_sockets_lock);
1083 
1084         for (sat->sat_port = ATPORT_RESERVED;
1085              sat->sat_port < ATPORT_LAST;
1086              sat->sat_port++) {
1087                 struct sock *s;
1088                 struct hlist_node *node;
1089 
1090                 sk_for_each(s, node, &atalk_sockets) {
1091                         struct atalk_sock *at = at_sk(s);
1092 
1093                         if (at->src_net == sat->sat_addr.s_net &&
1094                             at->src_node == sat->sat_addr.s_node &&
1095                             at->src_port == sat->sat_port)
1096                                 goto try_next_port;
1097                 }
1098 
1099                 /* Wheee, it's free, assign and insert. */
1100                 __atalk_insert_socket(sk);
1101                 at_sk(sk)->src_port = sat->sat_port;
1102                 retval = 0;
1103                 goto out;
1104 
1105 try_next_port:;
1106         }
1107 
1108         retval = -EBUSY;
1109 out:
1110         write_unlock_bh(&atalk_sockets_lock);
1111         return retval;
1112 }
1113 
1114 static int atalk_autobind(struct sock *sk)
1115 {
1116         struct atalk_sock *at = at_sk(sk);
1117         struct sockaddr_at sat;
1118         struct atalk_addr *ap = atalk_find_primary();
1119         int n = -EADDRNOTAVAIL;
1120 
1121         if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1122                 goto out;
1123 
1124         at->src_net  = sat.sat_addr.s_net  = ap->s_net;
1125         at->src_node = sat.sat_addr.s_node = ap->s_node;
1126 
1127         n = atalk_pick_and_bind_port(sk, &sat);
1128         if (!n)
1129                 sock_reset_flag(sk, SOCK_ZAPPED);
1130 out:
1131         return n;
1132 }
1133 
1134 /* Set the address 'our end' of the connection */
1135 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1136 {
1137         struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1138         struct sock *sk = sock->sk;
1139         struct atalk_sock *at = at_sk(sk);
1140         int err;
1141 
1142         if (!sock_flag(sk, SOCK_ZAPPED) ||
1143             addr_len != sizeof(struct sockaddr_at))
1144                 return -EINVAL;
1145 
1146         if (addr->sat_family != AF_APPLETALK)
1147                 return -EAFNOSUPPORT;
1148 
1149         lock_sock(sk);
1150         if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1151                 struct atalk_addr *ap = atalk_find_primary();
1152 
1153                 err = -EADDRNOTAVAIL;
1154                 if (!ap)
1155                         goto out;
1156 
1157                 at->src_net  = addr->sat_addr.s_net = ap->s_net;
1158                 at->src_node = addr->sat_addr.s_node= ap->s_node;
1159         } else {
1160                 err = -EADDRNOTAVAIL;
1161                 if (!atalk_find_interface(addr->sat_addr.s_net,
1162                                           addr->sat_addr.s_node))
1163                         goto out;
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                 err = atalk_pick_and_bind_port(sk, addr);
1171 
1172                 if (err < 0)
1173                         goto out;
1174         } else {
1175                 at->src_port = addr->sat_port;
1176 
1177                 err = -EADDRINUSE;
1178                 if (atalk_find_or_insert_socket(sk, addr))
1179                         goto out;
1180         }
1181 
1182         sock_reset_flag(sk, SOCK_ZAPPED);
1183         err = 0;
1184 out:
1185         release_sock(sk);
1186         return err;
1187 }
1188 
1189 /* Set the address we talk to */
1190 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1191                          int addr_len, int flags)
1192 {
1193         struct sock *sk = sock->sk;
1194         struct atalk_sock *at = at_sk(sk);
1195         struct sockaddr_at *addr;
1196         int err;
1197 
1198         sk->sk_state   = TCP_CLOSE;
1199         sock->state = SS_UNCONNECTED;
1200 
1201         if (addr_len != sizeof(*addr))
1202                 return -EINVAL;
1203 
1204         addr = (struct sockaddr_at *)uaddr;
1205 
1206         if (addr->sat_family != AF_APPLETALK)
1207                 return -EAFNOSUPPORT;
1208 
1209         if (addr->sat_addr.s_node == ATADDR_BCAST &&
1210             !sock_flag(sk, SOCK_BROADCAST)) {
1211 #if 1
1212                 printk(KERN_WARNING "%s is broken and did not set "
1213                                     "SO_BROADCAST. It will break when 2.2 is "
1214                                     "released.\n",
1215                         current->comm);
1216 #else
1217                 return -EACCES;
1218 #endif
1219         }
1220 
1221         lock_sock(sk);
1222         err = -EBUSY;
1223         if (sock_flag(sk, SOCK_ZAPPED))
1224                 if (atalk_autobind(sk) < 0)
1225                         goto out;
1226 
1227         err = -ENETUNREACH;
1228         if (!atrtr_get_dev(&addr->sat_addr))
1229                 goto out;
1230 
1231         at->dest_port = addr->sat_port;
1232         at->dest_net  = addr->sat_addr.s_net;
1233         at->dest_node = addr->sat_addr.s_node;
1234 
1235         sock->state  = SS_CONNECTED;
1236         sk->sk_state = TCP_ESTABLISHED;
1237         err = 0;
1238 out:
1239         release_sock(sk);
1240         return err;
1241 }
1242 
1243 /*
1244  * Find the name of an AppleTalk socket. Just copy the right
1245  * fields into the sockaddr.
1246  */
1247 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1248                          int *uaddr_len, int peer)
1249 {
1250         struct sockaddr_at sat;
1251         struct sock *sk = sock->sk;
1252         struct atalk_sock *at = at_sk(sk);
1253         int err;
1254 
1255         lock_sock(sk);
1256         err = -ENOBUFS;
1257         if (sock_flag(sk, SOCK_ZAPPED))
1258                 if (atalk_autobind(sk) < 0)
1259                         goto out;
1260 
1261         *uaddr_len = sizeof(struct sockaddr_at);
1262         memset(&sat.sat_zero, 0, sizeof(sat.sat_zero));
1263 
1264         if (peer) {
1265                 err = -ENOTCONN;
1266                 if (sk->sk_state != TCP_ESTABLISHED)
1267                         goto out;
1268 
1269                 sat.sat_addr.s_net  = at->dest_net;
1270                 sat.sat_addr.s_node = at->dest_node;
1271                 sat.sat_port        = at->dest_port;
1272         } else {
1273                 sat.sat_addr.s_net  = at->src_net;
1274                 sat.sat_addr.s_node = at->src_node;
1275                 sat.sat_port        = at->src_port;
1276         }
1277 
1278         err = 0;
1279         sat.sat_family = AF_APPLETALK;
1280         memcpy(uaddr, &sat, sizeof(sat));
1281 
1282 out:
1283         release_sock(sk);
1284         return err;
1285 }
1286 
1287 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1288 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1289 {
1290         return skb->data[12] == 22;
1291 }
1292 
1293 static int handle_ip_over_ddp(struct sk_buff *skb)
1294 {
1295         struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
1296         struct net_device_stats *stats;
1297 
1298         /* This needs to be able to handle ipddp"N" devices */
1299         if (!dev) {
1300                 kfree_skb(skb);
1301                 return NET_RX_DROP;
1302         }
1303 
1304         skb->protocol = htons(ETH_P_IP);
1305         skb_pull(skb, 13);
1306         skb->dev   = dev;
1307         skb_reset_transport_header(skb);
1308 
1309         stats = netdev_priv(dev);
1310         stats->rx_packets++;
1311         stats->rx_bytes += skb->len + 13;
1312         return netif_rx(skb);  /* Send the SKB up to a higher place. */
1313 }
1314 #else
1315 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1316 #define is_ip_over_ddp(skb) 0
1317 #define handle_ip_over_ddp(skb) 0
1318 #endif
1319 
1320 static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1321                               struct ddpehdr *ddp, __u16 len_hops, int origlen)
1322 {
1323         struct atalk_route *rt;
1324         struct atalk_addr ta;
1325 
1326         /*
1327          * Don't route multicast, etc., packets, or packets sent to "this
1328          * network"
1329          */
1330         if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1331                 /*
1332                  * FIXME:
1333                  *
1334                  * Can it ever happen that a packet is from a PPP iface and
1335                  * needs to be broadcast onto the default network?
1336                  */
1337                 if (dev->type == ARPHRD_PPP)
1338                         printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1339                                           "packet received from PPP iface\n");
1340                 goto free_it;
1341         }
1342 
1343         ta.s_net  = ddp->deh_dnet;
1344         ta.s_node = ddp->deh_dnode;
1345 
1346         /* Route the packet */
1347         rt = atrtr_find(&ta);
1348         /* increment hops count */
1349         len_hops += 1 << 10;
1350         if (!rt || !(len_hops & (15 << 10)))
1351                 goto free_it;
1352 
1353         /* FIXME: use skb->cb to be able to use shared skbs */
1354 
1355         /*
1356          * Route goes through another gateway, so set the target to the
1357          * gateway instead.
1358          */
1359 
1360         if (rt->flags & RTF_GATEWAY) {
1361                 ta.s_net  = rt->gateway.s_net;
1362                 ta.s_node = rt->gateway.s_node;
1363         }
1364 
1365         /* Fix up skb->len field */
1366         skb_trim(skb, min_t(unsigned int, origlen,
1367                             (rt->dev->hard_header_len +
1368                              ddp_dl->header_length + (len_hops & 1023))));
1369 
1370         /* FIXME: use skb->cb to be able to use shared skbs */
1371         ddp->deh_len_hops = htons(len_hops);
1372 
1373         /*
1374          * Send the buffer onwards
1375          *
1376          * Now we must always be careful. If it's come from LocalTalk to
1377          * EtherTalk it might not fit
1378          *
1379          * Order matters here: If a packet has to be copied to make a new
1380          * headroom (rare hopefully) then it won't need unsharing.
1381          *
1382          * Note. ddp-> becomes invalid at the realloc.
1383          */
1384         if (skb_headroom(skb) < 22) {
1385                 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1386                 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1387                 kfree_skb(skb);
1388                 skb = nskb;
1389         } else
1390                 skb = skb_unshare(skb, GFP_ATOMIC);
1391 
1392         /*
1393          * If the buffer didn't vanish into the lack of space bitbucket we can
1394          * send it.
1395          */
1396         if (skb == NULL)
1397                 goto drop;
1398 
1399         if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
1400                 return NET_RX_DROP;
1401         return NET_RX_SUCCESS;
1402 free_it:
1403         kfree_skb(skb);
1404 drop:
1405         return NET_RX_DROP;
1406 }
1407 
1408 /**
1409  *      atalk_rcv - Receive a packet (in skb) from device dev
1410  *      @skb - packet received
1411  *      @dev - network device where the packet comes from
1412  *      @pt - packet type
1413  *
1414  *      Receive a packet (in skb) from device dev. This has come from the SNAP
1415  *      decoder, and on entry skb->transport_header is the DDP header, skb->len
1416  *      is the DDP header, skb->len is the DDP length. The physical headers
1417  *      have been extracted. PPP should probably pass frames marked as for this
1418  *      layer.  [ie ARPHRD_ETHERTALK]
1419  */
1420 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1421                      struct packet_type *pt, struct net_device *orig_dev)
1422 {
1423         struct ddpehdr *ddp;
1424         struct sock *sock;
1425         struct atalk_iface *atif;
1426         struct sockaddr_at tosat;
1427         int origlen;
1428         __u16 len_hops;
1429 
1430         if (!net_eq(dev_net(dev), &init_net))
1431                 goto drop;
1432 
1433         /* Don't mangle buffer if shared */
1434         if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1435                 goto out;
1436 
1437         /* Size check and make sure header is contiguous */
1438         if (!pskb_may_pull(skb, sizeof(*ddp)))
1439                 goto drop;
1440 
1441         ddp = ddp_hdr(skb);
1442 
1443         len_hops = ntohs(ddp->deh_len_hops);
1444 
1445         /* Trim buffer in case of stray trailing data */
1446         origlen = skb->len;
1447         skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1448 
1449         /*
1450          * Size check to see if ddp->deh_len was crap
1451          * (Otherwise we'll detonate most spectacularly
1452          * in the middle of atalk_checksum() or recvmsg()).
1453          */
1454         if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1455                 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1456                          "skb->len=%u)\n", len_hops & 1023, skb->len);
1457                 goto drop;
1458         }
1459 
1460         /*
1461          * Any checksums. Note we don't do htons() on this == is assumed to be
1462          * valid for net byte orders all over the networking code...
1463          */
1464         if (ddp->deh_sum &&
1465             atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1466                 /* Not a valid AppleTalk frame - dustbin time */
1467                 goto drop;
1468 
1469         /* Check the packet is aimed at us */
1470         if (!ddp->deh_dnet)     /* Net 0 is 'this network' */
1471                 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1472         else
1473                 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1474 
1475         if (!atif) {
1476                 /* Not ours, so we route the packet via the correct
1477                  * AppleTalk iface
1478                  */
1479                 return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1480         }
1481 
1482         /* if IP over DDP is not selected this code will be optimized out */
1483         if (is_ip_over_ddp(skb))
1484                 return handle_ip_over_ddp(skb);
1485         /*
1486          * Which socket - atalk_search_socket() looks for a *full match*
1487          * of the <net, node, port> tuple.
1488          */
1489         tosat.sat_addr.s_net  = ddp->deh_dnet;
1490         tosat.sat_addr.s_node = ddp->deh_dnode;
1491         tosat.sat_port        = ddp->deh_dport;
1492 
1493         sock = atalk_search_socket(&tosat, atif);
1494         if (!sock) /* But not one of our sockets */
1495                 goto drop;
1496 
1497         /* Queue packet (standard) */
1498         skb->sk = sock;
1499 
1500         if (sock_queue_rcv_skb(sock, skb) < 0)
1501                 goto drop;
1502 
1503         return NET_RX_SUCCESS;
1504 
1505 drop:
1506         kfree_skb(skb);
1507 out:
1508         return NET_RX_DROP;
1509 
1510 }
1511 
1512 /*
1513  * Receive a LocalTalk frame. We make some demands on the caller here.
1514  * Caller must provide enough headroom on the packet to pull the short
1515  * header and append a long one.
1516  */
1517 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1518                      struct packet_type *pt, struct net_device *orig_dev)
1519 {
1520         if (!net_eq(dev_net(dev), &init_net))
1521                 goto freeit;
1522 
1523         /* Expand any short form frames */
1524         if (skb_mac_header(skb)[2] == 1) {
1525                 struct ddpehdr *ddp;
1526                 /* Find our address */
1527                 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1528 
1529                 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1530                         goto freeit;
1531 
1532                 /* Don't mangle buffer if shared */
1533                 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1534                         return 0;
1535 
1536                 /*
1537                  * The push leaves us with a ddephdr not an shdr, and
1538                  * handily the port bytes in the right place preset.
1539                  */
1540                 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1541 
1542                 /* Now fill in the long header */
1543 
1544                 /*
1545                  * These two first. The mac overlays the new source/dest
1546                  * network information so we MUST copy these before
1547                  * we write the network numbers !
1548                  */
1549 
1550                 ddp->deh_dnode = skb_mac_header(skb)[0];     /* From physical header */
1551                 ddp->deh_snode = skb_mac_header(skb)[1];     /* From physical header */
1552 
1553                 ddp->deh_dnet  = ap->s_net;     /* Network number */
1554                 ddp->deh_snet  = ap->s_net;
1555                 ddp->deh_sum   = 0;             /* No checksum */
1556                 /*
1557                  * Not sure about this bit...
1558                  */
1559                 /* Non routable, so force a drop if we slip up later */
1560                 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1561         }
1562         skb_reset_transport_header(skb);
1563 
1564         return atalk_rcv(skb, dev, pt, orig_dev);
1565 freeit:
1566         kfree_skb(skb);
1567         return 0;
1568 }
1569 
1570 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1571                          size_t len)
1572 {
1573         struct sock *sk = sock->sk;
1574         struct atalk_sock *at = at_sk(sk);
1575         struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1576         int flags = msg->msg_flags;
1577         int loopback = 0;
1578         struct sockaddr_at local_satalk, gsat;
1579         struct sk_buff *skb;
1580         struct net_device *dev;
1581         struct ddpehdr *ddp;
1582         int size;
1583         struct atalk_route *rt;
1584         int err;
1585 
1586         if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1587                 return -EINVAL;
1588 
1589         if (len > DDP_MAXSZ)
1590                 return -EMSGSIZE;
1591 
1592         lock_sock(sk);
1593         if (usat) {
1594                 err = -EBUSY;
1595                 if (sock_flag(sk, SOCK_ZAPPED))
1596                         if (atalk_autobind(sk) < 0)
1597                                 goto out;
1598 
1599                 err = -EINVAL;
1600                 if (msg->msg_namelen < sizeof(*usat) ||
1601                     usat->sat_family != AF_APPLETALK)
1602                         goto out;
1603 
1604                 err = -EPERM;
1605                 /* netatalk didn't implement this check */
1606                 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1607                     !sock_flag(sk, SOCK_BROADCAST)) {
1608                         goto out;
1609                 }
1610         } else {
1611                 err = -ENOTCONN;
1612                 if (sk->sk_state != TCP_ESTABLISHED)
1613                         goto out;
1614                 usat = &local_satalk;
1615                 usat->sat_family      = AF_APPLETALK;
1616                 usat->sat_port        = at->dest_port;
1617                 usat->sat_addr.s_node = at->dest_node;
1618                 usat->sat_addr.s_net  = at->dest_net;
1619         }
1620 
1621         /* Build a packet */
1622         SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1623 
1624         /* For headers */
1625         size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1626 
1627         if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1628                 rt = atrtr_find(&usat->sat_addr);
1629         } else {
1630                 struct atalk_addr at_hint;
1631 
1632                 at_hint.s_node = 0;
1633                 at_hint.s_net  = at->src_net;
1634 
1635                 rt = atrtr_find(&at_hint);
1636         }
1637         err = ENETUNREACH;
1638         if (!rt)
1639                 goto out;
1640 
1641         dev = rt->dev;
1642 
1643         SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1644                         sk, size, dev->name);
1645 
1646         size += dev->hard_header_len;
1647         release_sock(sk);
1648         skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1649         lock_sock(sk);
1650         if (!skb)
1651                 goto out;
1652 
1653         skb->sk = sk;
1654         skb_reserve(skb, ddp_dl->header_length);
1655         skb_reserve(skb, dev->hard_header_len);
1656         skb->dev = dev;
1657 
1658         SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1659 
1660         ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1661         ddp->deh_len_hops  = htons(len + sizeof(*ddp));
1662         ddp->deh_dnet  = usat->sat_addr.s_net;
1663         ddp->deh_snet  = at->src_net;
1664         ddp->deh_dnode = usat->sat_addr.s_node;
1665         ddp->deh_snode = at->src_node;
1666         ddp->deh_dport = usat->sat_port;
1667         ddp->deh_sport = at->src_port;
1668 
1669         SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1670 
1671         err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1672         if (err) {
1673                 kfree_skb(skb);
1674                 err = -EFAULT;
1675                 goto out;
1676         }
1677 
1678         if (sk->sk_no_check == 1)
1679                 ddp->deh_sum = 0;
1680         else
1681                 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1682 
1683         /*
1684          * Loopback broadcast packets to non gateway targets (ie routes
1685          * to group we are in)
1686          */
1687         if (ddp->deh_dnode == ATADDR_BCAST &&
1688             !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1689                 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1690 
1691                 if (skb2) {
1692                         loopback = 1;
1693                         SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1694                         /*
1695                          * If it fails it is queued/sent above in the aarp queue
1696                          */
1697                         aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
1698                 }
1699         }
1700 
1701         if (dev->flags & IFF_LOOPBACK || loopback) {
1702                 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1703                 /* loop back */
1704                 skb_orphan(skb);
1705                 if (ddp->deh_dnode == ATADDR_BCAST) {
1706                         struct atalk_addr at_lo;
1707 
1708                         at_lo.s_node = 0;
1709                         at_lo.s_net  = 0;
1710 
1711                         rt = atrtr_find(&at_lo);
1712                         if (!rt) {
1713                                 kfree_skb(skb);
1714                                 err = -ENETUNREACH;
1715                                 goto out;
1716                         }
1717                         dev = rt->dev;
1718                         skb->dev = dev;
1719                 }
1720                 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1721         } else {
1722                 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1723                 if (rt->flags & RTF_GATEWAY) {
1724                     gsat.sat_addr = rt->gateway;
1725                     usat = &gsat;
1726                 }
1727 
1728                 /*
1729                  * If it fails it is queued/sent above in the aarp queue
1730                  */
1731                 aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
1732         }
1733         SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1734 
1735 out:
1736         release_sock(sk);
1737         return err ? : len;
1738 }
1739 
1740 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1741                          size_t size, int flags)
1742 {
1743         struct sock *sk = sock->sk;
1744         struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1745         struct ddpehdr *ddp;
1746         int copied = 0;
1747         int offset = 0;
1748         int err = 0;
1749         struct sk_buff *skb;
1750 
1751         skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1752                                                 flags & MSG_DONTWAIT, &err);
1753         lock_sock(sk);
1754 
1755         if (!skb)
1756                 goto out;
1757 
1758         /* FIXME: use skb->cb to be able to use shared skbs */
1759         ddp = ddp_hdr(skb);
1760         copied = ntohs(ddp->deh_len_hops) & 1023;
1761 
1762         if (sk->sk_type != SOCK_RAW) {
1763                 offset = sizeof(*ddp);
1764                 copied -= offset;
1765         }
1766 
1767         if (copied > size) {
1768                 copied = size;
1769                 msg->msg_flags |= MSG_TRUNC;
1770         }
1771         err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1772 
1773         if (!err) {
1774                 if (sat) {
1775                         sat->sat_family      = AF_APPLETALK;
1776                         sat->sat_port        = ddp->deh_sport;
1777                         sat->sat_addr.s_node = ddp->deh_snode;
1778                         sat->sat_addr.s_net  = ddp->deh_snet;
1779                 }
1780                 msg->msg_namelen = sizeof(*sat);
1781         }
1782 
1783         skb_free_datagram(sk, skb);     /* Free the datagram. */
1784 
1785 out:
1786         release_sock(sk);
1787         return err ? : copied;
1788 }
1789 
1790 
1791 /*
1792  * AppleTalk ioctl calls.
1793  */
1794 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1795 {
1796         int rc = -ENOIOCTLCMD;
1797         struct sock *sk = sock->sk;
1798         void __user *argp = (void __user *)arg;
1799 
1800         switch (cmd) {
1801                 /* Protocol layer */
1802                 case TIOCOUTQ: {
1803                         long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1804 
1805                         if (amount < 0)
1806                                 amount = 0;
1807                         rc = put_user(amount, (int __user *)argp);
1808                         break;
1809                 }
1810                 case TIOCINQ: {
1811                         /*
1812                          * These two are safe on a single CPU system as only
1813                          * user tasks fiddle here
1814                          */
1815                         struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1816                         long amount = 0;
1817 
1818                         if (skb)
1819                                 amount = skb->len - sizeof(struct ddpehdr);
1820                         rc = put_user(amount, (int __user *)argp);
1821                         break;
1822                 }
1823                 case SIOCGSTAMP:
1824                         rc = sock_get_timestamp(sk, argp);
1825                         break;
1826                 case SIOCGSTAMPNS:
1827                         rc = sock_get_timestampns(sk, argp);
1828                         break;
1829                 /* Routing */
1830                 case SIOCADDRT:
1831                 case SIOCDELRT:
1832                         rc = -EPERM;
1833                         if (capable(CAP_NET_ADMIN))
1834                                 rc = atrtr_ioctl(cmd, argp);
1835                         break;
1836                 /* Interface */
1837                 case SIOCGIFADDR:
1838                 case SIOCSIFADDR:
1839                 case SIOCGIFBRDADDR:
1840                 case SIOCATALKDIFADDR:
1841                 case SIOCDIFADDR:
1842                 case SIOCSARP:          /* proxy AARP */
1843                 case SIOCDARP:          /* proxy AARP */
1844                         rtnl_lock();
1845                         rc = atif_ioctl(cmd, argp);
1846                         rtnl_unlock();
1847                         break;
1848         }
1849 
1850         return rc;
1851 }
1852 
1853 
1854 #ifdef CONFIG_COMPAT
1855 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1856 {
1857         /*
1858          * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
1859          * cannot handle it in common code. The data we access if ifreq
1860          * here is compatible, so we can simply call the native
1861          * handler.
1862          */
1863         if (cmd == SIOCATALKDIFADDR)
1864                 return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1865 
1866         return -ENOIOCTLCMD;
1867 }
1868 #endif
1869 
1870 
1871 static const struct net_proto_family atalk_family_ops = {
1872         .family         = PF_APPLETALK,
1873         .create         = atalk_create,
1874         .owner          = THIS_MODULE,
1875 };
1876 
1877 static const struct proto_ops atalk_dgram_ops = {
1878         .family         = PF_APPLETALK,
1879         .owner          = THIS_MODULE,
1880         .release        = atalk_release,
1881         .bind           = atalk_bind,
1882         .connect        = atalk_connect,
1883         .socketpair     = sock_no_socketpair,
1884         .accept         = sock_no_accept,
1885         .getname        = atalk_getname,
1886         .poll           = datagram_poll,
1887         .ioctl          = atalk_ioctl,
1888 #ifdef CONFIG_COMPAT
1889         .compat_ioctl   = atalk_compat_ioctl,
1890 #endif
1891         .listen         = sock_no_listen,
1892         .shutdown       = sock_no_shutdown,
1893         .setsockopt     = sock_no_setsockopt,
1894         .getsockopt     = sock_no_getsockopt,
1895         .sendmsg        = atalk_sendmsg,
1896         .recvmsg        = atalk_recvmsg,
1897         .mmap           = sock_no_mmap,
1898         .sendpage       = sock_no_sendpage,
1899 };
1900 
1901 static struct notifier_block ddp_notifier = {
1902         .notifier_call  = ddp_device_event,
1903 };
1904 
1905 static struct packet_type ltalk_packet_type __read_mostly = {
1906         .type           = cpu_to_be16(ETH_P_LOCALTALK),
1907         .func           = ltalk_rcv,
1908 };
1909 
1910 static struct packet_type ppptalk_packet_type __read_mostly = {
1911         .type           = cpu_to_be16(ETH_P_PPPTALK),
1912         .func           = atalk_rcv,
1913 };
1914 
1915 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1916 
1917 /* Export symbols for use by drivers when AppleTalk is a module */
1918 EXPORT_SYMBOL(atrtr_get_dev);
1919 EXPORT_SYMBOL(atalk_find_dev_addr);
1920 
1921 static const char atalk_err_snap[] __initconst =
1922         KERN_CRIT "Unable to register DDP with SNAP.\n";
1923 
1924 /* Called by proto.c on kernel start up */
1925 static int __init atalk_init(void)
1926 {
1927         int rc = proto_register(&ddp_proto, 0);
1928 
1929         if (rc != 0)
1930                 goto out;
1931 
1932         (void)sock_register(&atalk_family_ops);
1933         ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1934         if (!ddp_dl)
1935                 printk(atalk_err_snap);
1936 
1937         dev_add_pack(&ltalk_packet_type);
1938         dev_add_pack(&ppptalk_packet_type);
1939 
1940         register_netdevice_notifier(&ddp_notifier);
1941         aarp_proto_init();
1942         atalk_proc_init();
1943         atalk_register_sysctl();
1944 out:
1945         return rc;
1946 }
1947 module_init(atalk_init);
1948 
1949 /*
1950  * No explicit module reference count manipulation is needed in the
1951  * protocol. Socket layer sets module reference count for us
1952  * and interfaces reference counting is done
1953  * by the network device layer.
1954  *
1955  * Ergo, before the AppleTalk module can be removed, all AppleTalk
1956  * sockets be closed from user space.
1957  */
1958 static void __exit atalk_exit(void)
1959 {
1960 #ifdef CONFIG_SYSCTL
1961         atalk_unregister_sysctl();
1962 #endif /* CONFIG_SYSCTL */
1963         atalk_proc_exit();
1964         aarp_cleanup_module();  /* General aarp clean-up. */
1965         unregister_netdevice_notifier(&ddp_notifier);
1966         dev_remove_pack(&ltalk_packet_type);
1967         dev_remove_pack(&ppptalk_packet_type);
1968         unregister_snap_client(ddp_dl);
1969         sock_unregister(PF_APPLETALK);
1970         proto_unregister(&ddp_proto);
1971 }
1972 module_exit(atalk_exit);
1973 
1974 MODULE_LICENSE("GPL");
1975 MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
1976 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1977 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
1978 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp