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Linux/net/appletalk/ddp.c

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  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 <linux/highmem.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 
 97         read_lock_bh(&atalk_sockets_lock);
 98         sk_for_each(s, &atalk_sockets) {
 99                 struct atalk_sock *at = at_sk(s);
100 
101                 if (to->sat_port != at->src_port)
102                         continue;
103 
104                 if (to->sat_addr.s_net == ATADDR_ANYNET &&
105                     to->sat_addr.s_node == ATADDR_BCAST)
106                         goto found;
107 
108                 if (to->sat_addr.s_net == at->src_net &&
109                     (to->sat_addr.s_node == at->src_node ||
110                      to->sat_addr.s_node == ATADDR_BCAST ||
111                      to->sat_addr.s_node == ATADDR_ANYNODE))
112                         goto found;
113 
114                 /* XXXX.0 -- we got a request for this router. make sure
115                  * that the node is appropriately set. */
116                 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
117                     to->sat_addr.s_net != ATADDR_ANYNET &&
118                     atif->address.s_node == at->src_node) {
119                         to->sat_addr.s_node = atif->address.s_node;
120                         goto found;
121                 }
122         }
123         s = NULL;
124 found:
125         read_unlock_bh(&atalk_sockets_lock);
126         return s;
127 }
128 
129 /**
130  * atalk_find_or_insert_socket - Try to find a socket matching ADDR
131  * @sk: socket to insert in the list if it is not there already
132  * @sat: address to search for
133  *
134  * Try to find a socket matching ADDR in the socket list, if found then return
135  * it. If not, insert SK into the socket list.
136  *
137  * This entire operation must execute atomically.
138  */
139 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
140                                                 struct sockaddr_at *sat)
141 {
142         struct sock *s;
143         struct atalk_sock *at;
144 
145         write_lock_bh(&atalk_sockets_lock);
146         sk_for_each(s, &atalk_sockets) {
147                 at = at_sk(s);
148 
149                 if (at->src_net == sat->sat_addr.s_net &&
150                     at->src_node == sat->sat_addr.s_node &&
151                     at->src_port == sat->sat_port)
152                         goto found;
153         }
154         s = NULL;
155         __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
156 found:
157         write_unlock_bh(&atalk_sockets_lock);
158         return s;
159 }
160 
161 static void atalk_destroy_timer(unsigned long data)
162 {
163         struct sock *sk = (struct sock *)data;
164 
165         if (sk_has_allocations(sk)) {
166                 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
167                 add_timer(&sk->sk_timer);
168         } else
169                 sock_put(sk);
170 }
171 
172 static inline void atalk_destroy_socket(struct sock *sk)
173 {
174         atalk_remove_socket(sk);
175         skb_queue_purge(&sk->sk_receive_queue);
176 
177         if (sk_has_allocations(sk)) {
178                 setup_timer(&sk->sk_timer, atalk_destroy_timer,
179                                 (unsigned long)sk);
180                 sk->sk_timer.expires    = jiffies + SOCK_DESTROY_TIME;
181                 add_timer(&sk->sk_timer);
182         } else
183                 sock_put(sk);
184 }
185 
186 /**************************************************************************\
187 *                                                                          *
188 * Routing tables for the AppleTalk socket layer.                           *
189 *                                                                          *
190 \**************************************************************************/
191 
192 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
193 struct atalk_route *atalk_routes;
194 DEFINE_RWLOCK(atalk_routes_lock);
195 
196 struct atalk_iface *atalk_interfaces;
197 DEFINE_RWLOCK(atalk_interfaces_lock);
198 
199 /* For probing devices or in a routerless network */
200 struct atalk_route atrtr_default;
201 
202 /* AppleTalk interface control */
203 /*
204  * Drop a device. Doesn't drop any of its routes - that is the caller's
205  * problem. Called when we down the interface or delete the address.
206  */
207 static void atif_drop_device(struct net_device *dev)
208 {
209         struct atalk_iface **iface = &atalk_interfaces;
210         struct atalk_iface *tmp;
211 
212         write_lock_bh(&atalk_interfaces_lock);
213         while ((tmp = *iface) != NULL) {
214                 if (tmp->dev == dev) {
215                         *iface = tmp->next;
216                         dev_put(dev);
217                         kfree(tmp);
218                         dev->atalk_ptr = NULL;
219                 } else
220                         iface = &tmp->next;
221         }
222         write_unlock_bh(&atalk_interfaces_lock);
223 }
224 
225 static struct atalk_iface *atif_add_device(struct net_device *dev,
226                                            struct atalk_addr *sa)
227 {
228         struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
229 
230         if (!iface)
231                 goto out;
232 
233         dev_hold(dev);
234         iface->dev = dev;
235         dev->atalk_ptr = iface;
236         iface->address = *sa;
237         iface->status = 0;
238 
239         write_lock_bh(&atalk_interfaces_lock);
240         iface->next = atalk_interfaces;
241         atalk_interfaces = iface;
242         write_unlock_bh(&atalk_interfaces_lock);
243 out:
244         return iface;
245 }
246 
247 /* Perform phase 2 AARP probing on our tentative address */
248 static int atif_probe_device(struct atalk_iface *atif)
249 {
250         int netrange = ntohs(atif->nets.nr_lastnet) -
251                         ntohs(atif->nets.nr_firstnet) + 1;
252         int probe_net = ntohs(atif->address.s_net);
253         int probe_node = atif->address.s_node;
254         int netct, nodect;
255 
256         /* Offset the network we start probing with */
257         if (probe_net == ATADDR_ANYNET) {
258                 probe_net = ntohs(atif->nets.nr_firstnet);
259                 if (netrange)
260                         probe_net += jiffies % netrange;
261         }
262         if (probe_node == ATADDR_ANYNODE)
263                 probe_node = jiffies & 0xFF;
264 
265         /* Scan the networks */
266         atif->status |= ATIF_PROBE;
267         for (netct = 0; netct <= netrange; netct++) {
268                 /* Sweep the available nodes from a given start */
269                 atif->address.s_net = htons(probe_net);
270                 for (nodect = 0; nodect < 256; nodect++) {
271                         atif->address.s_node = (nodect + probe_node) & 0xFF;
272                         if (atif->address.s_node > 0 &&
273                             atif->address.s_node < 254) {
274                                 /* Probe a proposed address */
275                                 aarp_probe_network(atif);
276 
277                                 if (!(atif->status & ATIF_PROBE_FAIL)) {
278                                         atif->status &= ~ATIF_PROBE;
279                                         return 0;
280                                 }
281                         }
282                         atif->status &= ~ATIF_PROBE_FAIL;
283                 }
284                 probe_net++;
285                 if (probe_net > ntohs(atif->nets.nr_lastnet))
286                         probe_net = ntohs(atif->nets.nr_firstnet);
287         }
288         atif->status &= ~ATIF_PROBE;
289 
290         return -EADDRINUSE;     /* Network is full... */
291 }
292 
293 
294 /* Perform AARP probing for a proxy address */
295 static int atif_proxy_probe_device(struct atalk_iface *atif,
296                                    struct atalk_addr *proxy_addr)
297 {
298         int netrange = ntohs(atif->nets.nr_lastnet) -
299                         ntohs(atif->nets.nr_firstnet) + 1;
300         /* we probe the interface's network */
301         int probe_net = ntohs(atif->address.s_net);
302         int probe_node = ATADDR_ANYNODE;            /* we'll take anything */
303         int netct, nodect;
304 
305         /* Offset the network we start probing with */
306         if (probe_net == ATADDR_ANYNET) {
307                 probe_net = ntohs(atif->nets.nr_firstnet);
308                 if (netrange)
309                         probe_net += jiffies % netrange;
310         }
311 
312         if (probe_node == ATADDR_ANYNODE)
313                 probe_node = jiffies & 0xFF;
314 
315         /* Scan the networks */
316         for (netct = 0; netct <= netrange; netct++) {
317                 /* Sweep the available nodes from a given start */
318                 proxy_addr->s_net = htons(probe_net);
319                 for (nodect = 0; nodect < 256; nodect++) {
320                         proxy_addr->s_node = (nodect + probe_node) & 0xFF;
321                         if (proxy_addr->s_node > 0 &&
322                             proxy_addr->s_node < 254) {
323                                 /* Tell AARP to probe a proposed address */
324                                 int ret = aarp_proxy_probe_network(atif,
325                                                                     proxy_addr);
326 
327                                 if (ret != -EADDRINUSE)
328                                         return ret;
329                         }
330                 }
331                 probe_net++;
332                 if (probe_net > ntohs(atif->nets.nr_lastnet))
333                         probe_net = ntohs(atif->nets.nr_firstnet);
334         }
335 
336         return -EADDRINUSE;     /* Network is full... */
337 }
338 
339 
340 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
341 {
342         struct atalk_iface *iface = dev->atalk_ptr;
343         return iface ? &iface->address : NULL;
344 }
345 
346 static struct atalk_addr *atalk_find_primary(void)
347 {
348         struct atalk_iface *fiface = NULL;
349         struct atalk_addr *retval;
350         struct atalk_iface *iface;
351 
352         /*
353          * Return a point-to-point interface only if
354          * there is no non-ptp interface available.
355          */
356         read_lock_bh(&atalk_interfaces_lock);
357         for (iface = atalk_interfaces; iface; iface = iface->next) {
358                 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
359                         fiface = iface;
360                 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
361                         retval = &iface->address;
362                         goto out;
363                 }
364         }
365 
366         if (fiface)
367                 retval = &fiface->address;
368         else if (atalk_interfaces)
369                 retval = &atalk_interfaces->address;
370         else
371                 retval = NULL;
372 out:
373         read_unlock_bh(&atalk_interfaces_lock);
374         return retval;
375 }
376 
377 /*
378  * Find a match for 'any network' - ie any of our interfaces with that
379  * node number will do just nicely.
380  */
381 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
382 {
383         struct atalk_iface *iface = dev->atalk_ptr;
384 
385         if (!iface || iface->status & ATIF_PROBE)
386                 goto out_err;
387 
388         if (node != ATADDR_BCAST &&
389             iface->address.s_node != node &&
390             node != ATADDR_ANYNODE)
391                 goto out_err;
392 out:
393         return iface;
394 out_err:
395         iface = NULL;
396         goto out;
397 }
398 
399 /* Find a match for a specific network:node pair */
400 static struct atalk_iface *atalk_find_interface(__be16 net, int node)
401 {
402         struct atalk_iface *iface;
403 
404         read_lock_bh(&atalk_interfaces_lock);
405         for (iface = atalk_interfaces; iface; iface = iface->next) {
406                 if ((node == ATADDR_BCAST ||
407                      node == ATADDR_ANYNODE ||
408                      iface->address.s_node == node) &&
409                     iface->address.s_net == net &&
410                     !(iface->status & ATIF_PROBE))
411                         break;
412 
413                 /* XXXX.0 -- net.0 returns the iface associated with net */
414                 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
415                     ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
416                     ntohs(net) <= ntohs(iface->nets.nr_lastnet))
417                         break;
418         }
419         read_unlock_bh(&atalk_interfaces_lock);
420         return iface;
421 }
422 
423 
424 /*
425  * Find a route for an AppleTalk packet. This ought to get cached in
426  * the socket (later on...). We know about host routes and the fact
427  * that a route must be direct to broadcast.
428  */
429 static struct atalk_route *atrtr_find(struct atalk_addr *target)
430 {
431         /*
432          * we must search through all routes unless we find a
433          * host route, because some host routes might overlap
434          * network routes
435          */
436         struct atalk_route *net_route = NULL;
437         struct atalk_route *r;
438 
439         read_lock_bh(&atalk_routes_lock);
440         for (r = atalk_routes; r; r = r->next) {
441                 if (!(r->flags & RTF_UP))
442                         continue;
443 
444                 if (r->target.s_net == target->s_net) {
445                         if (r->flags & RTF_HOST) {
446                                 /*
447                                  * if this host route is for the target,
448                                  * the we're done
449                                  */
450                                 if (r->target.s_node == target->s_node)
451                                         goto out;
452                         } else
453                                 /*
454                                  * this route will work if there isn't a
455                                  * direct host route, so cache it
456                                  */
457                                 net_route = r;
458                 }
459         }
460 
461         /*
462          * if we found a network route but not a direct host
463          * route, then return it
464          */
465         if (net_route)
466                 r = net_route;
467         else if (atrtr_default.dev)
468                 r = &atrtr_default;
469         else /* No route can be found */
470                 r = NULL;
471 out:
472         read_unlock_bh(&atalk_routes_lock);
473         return r;
474 }
475 
476 
477 /*
478  * Given an AppleTalk network, find the device to use. This can be
479  * a simple lookup.
480  */
481 struct net_device *atrtr_get_dev(struct atalk_addr *sa)
482 {
483         struct atalk_route *atr = atrtr_find(sa);
484         return atr ? atr->dev : NULL;
485 }
486 
487 /* Set up a default router */
488 static void atrtr_set_default(struct net_device *dev)
489 {
490         atrtr_default.dev            = dev;
491         atrtr_default.flags          = RTF_UP;
492         atrtr_default.gateway.s_net  = htons(0);
493         atrtr_default.gateway.s_node = 0;
494 }
495 
496 /*
497  * Add a router. Basically make sure it looks valid and stuff the
498  * entry in the list. While it uses netranges we always set them to one
499  * entry to work like netatalk.
500  */
501 static int atrtr_create(struct rtentry *r, struct net_device *devhint)
502 {
503         struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
504         struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
505         struct atalk_route *rt;
506         struct atalk_iface *iface, *riface;
507         int retval = -EINVAL;
508 
509         /*
510          * Fixme: Raise/Lower a routing change semaphore for these
511          * operations.
512          */
513 
514         /* Validate the request */
515         if (ta->sat_family != AF_APPLETALK ||
516             (!devhint && ga->sat_family != AF_APPLETALK))
517                 goto out;
518 
519         /* Now walk the routing table and make our decisions */
520         write_lock_bh(&atalk_routes_lock);
521         for (rt = atalk_routes; rt; rt = rt->next) {
522                 if (r->rt_flags != rt->flags)
523                         continue;
524 
525                 if (ta->sat_addr.s_net == rt->target.s_net) {
526                         if (!(rt->flags & RTF_HOST))
527                                 break;
528                         if (ta->sat_addr.s_node == rt->target.s_node)
529                                 break;
530                 }
531         }
532 
533         if (!devhint) {
534                 riface = NULL;
535 
536                 read_lock_bh(&atalk_interfaces_lock);
537                 for (iface = atalk_interfaces; iface; iface = iface->next) {
538                         if (!riface &&
539                             ntohs(ga->sat_addr.s_net) >=
540                                         ntohs(iface->nets.nr_firstnet) &&
541                             ntohs(ga->sat_addr.s_net) <=
542                                         ntohs(iface->nets.nr_lastnet))
543                                 riface = iface;
544 
545                         if (ga->sat_addr.s_net == iface->address.s_net &&
546                             ga->sat_addr.s_node == iface->address.s_node)
547                                 riface = iface;
548                 }
549                 read_unlock_bh(&atalk_interfaces_lock);
550 
551                 retval = -ENETUNREACH;
552                 if (!riface)
553                         goto out_unlock;
554 
555                 devhint = riface->dev;
556         }
557 
558         if (!rt) {
559                 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
560 
561                 retval = -ENOBUFS;
562                 if (!rt)
563                         goto out_unlock;
564 
565                 rt->next = atalk_routes;
566                 atalk_routes = rt;
567         }
568 
569         /* Fill in the routing entry */
570         rt->target  = ta->sat_addr;
571         dev_hold(devhint);
572         rt->dev     = devhint;
573         rt->flags   = r->rt_flags;
574         rt->gateway = ga->sat_addr;
575 
576         retval = 0;
577 out_unlock:
578         write_unlock_bh(&atalk_routes_lock);
579 out:
580         return retval;
581 }
582 
583 /* Delete a route. Find it and discard it */
584 static int atrtr_delete(struct atalk_addr *addr)
585 {
586         struct atalk_route **r = &atalk_routes;
587         int retval = 0;
588         struct atalk_route *tmp;
589 
590         write_lock_bh(&atalk_routes_lock);
591         while ((tmp = *r) != NULL) {
592                 if (tmp->target.s_net == addr->s_net &&
593                     (!(tmp->flags&RTF_GATEWAY) ||
594                      tmp->target.s_node == addr->s_node)) {
595                         *r = tmp->next;
596                         dev_put(tmp->dev);
597                         kfree(tmp);
598                         goto out;
599                 }
600                 r = &tmp->next;
601         }
602         retval = -ENOENT;
603 out:
604         write_unlock_bh(&atalk_routes_lock);
605         return retval;
606 }
607 
608 /*
609  * Called when a device is downed. Just throw away any routes
610  * via it.
611  */
612 static void atrtr_device_down(struct net_device *dev)
613 {
614         struct atalk_route **r = &atalk_routes;
615         struct atalk_route *tmp;
616 
617         write_lock_bh(&atalk_routes_lock);
618         while ((tmp = *r) != NULL) {
619                 if (tmp->dev == dev) {
620                         *r = tmp->next;
621                         dev_put(dev);
622                         kfree(tmp);
623                 } else
624                         r = &tmp->next;
625         }
626         write_unlock_bh(&atalk_routes_lock);
627 
628         if (atrtr_default.dev == dev)
629                 atrtr_set_default(NULL);
630 }
631 
632 /* Actually down the interface */
633 static inline void atalk_dev_down(struct net_device *dev)
634 {
635         atrtr_device_down(dev); /* Remove all routes for the device */
636         aarp_device_down(dev);  /* Remove AARP entries for the device */
637         atif_drop_device(dev);  /* Remove the device */
638 }
639 
640 /*
641  * A device event has occurred. Watch for devices going down and
642  * delete our use of them (iface and route).
643  */
644 static int ddp_device_event(struct notifier_block *this, unsigned long event,
645                             void *ptr)
646 {
647         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
648 
649         if (!net_eq(dev_net(dev), &init_net))
650                 return NOTIFY_DONE;
651 
652         if (event == NETDEV_DOWN)
653                 /* Discard any use of this */
654                 atalk_dev_down(dev);
655 
656         return NOTIFY_DONE;
657 }
658 
659 /* ioctl calls. Shouldn't even need touching */
660 /* Device configuration ioctl calls */
661 static 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(&init_net, 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,
706                                          sa->sat_addr.s_node)) {
707                         printk(KERN_DEBUG "AppleTalk: point-to-point "
708                                "interface added with "
709                                "existing address\n");
710                         add_route = 0;
711                 }
712 
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_global(dev, aarp_mcast);
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 
802         case SIOCATALKDIFADDR:
803         case SIOCDIFADDR:
804                 if (!capable(CAP_NET_ADMIN))
805                         return -EPERM;
806                 if (sa->sat_family != AF_APPLETALK)
807                         return -EINVAL;
808                 atalk_dev_down(dev);
809                 break;
810 
811         case SIOCSARP:
812                 if (!capable(CAP_NET_ADMIN))
813                         return -EPERM;
814                 if (sa->sat_family != AF_APPLETALK)
815                         return -EINVAL;
816                 /*
817                  * for now, we only support proxy AARP on ELAP;
818                  * we should be able to do it for LocalTalk, too.
819                  */
820                 if (dev->type != ARPHRD_ETHER)
821                         return -EPROTONOSUPPORT;
822 
823                 /*
824                  * atif points to the current interface on this network;
825                  * we aren't concerned about its current status (at
826                  * least for now), but it has all the settings about
827                  * the network we're going to probe. Consequently, it
828                  * must exist.
829                  */
830                 if (!atif)
831                         return -EADDRNOTAVAIL;
832 
833                 nr = (struct atalk_netrange *)&(atif->nets);
834                 /*
835                  * Phase 1 is fine on Localtalk but we don't do
836                  * Ethertalk phase 1. Anyone wanting to add it go ahead.
837                  */
838                 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
839                         return -EPROTONOSUPPORT;
840 
841                 if (sa->sat_addr.s_node == ATADDR_BCAST ||
842                     sa->sat_addr.s_node == 254)
843                         return -EINVAL;
844 
845                 /*
846                  * Check if the chosen address is used. If so we
847                  * error and ATCP will try another.
848                  */
849                 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
850                         return -EADDRINUSE;
851 
852                 /*
853                  * We now have an address on the local network, and
854                  * the AARP code will defend it for us until we take it
855                  * down. We don't set up any routes right now, because
856                  * ATCP will install them manually via SIOCADDRT.
857                  */
858                 break;
859 
860         case SIOCDARP:
861                 if (!capable(CAP_NET_ADMIN))
862                         return -EPERM;
863                 if (sa->sat_family != AF_APPLETALK)
864                         return -EINVAL;
865                 if (!atif)
866                         return -EADDRNOTAVAIL;
867 
868                 /* give to aarp module to remove proxy entry */
869                 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
870                 return 0;
871         }
872 
873         return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
874 }
875 
876 /* Routing ioctl() calls */
877 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
878 {
879         struct rtentry rt;
880 
881         if (copy_from_user(&rt, arg, sizeof(rt)))
882                 return -EFAULT;
883 
884         switch (cmd) {
885         case SIOCDELRT:
886                 if (rt.rt_dst.sa_family != AF_APPLETALK)
887                         return -EINVAL;
888                 return atrtr_delete(&((struct sockaddr_at *)
889                                       &rt.rt_dst)->sat_addr);
890 
891         case SIOCADDRT: {
892                 struct net_device *dev = NULL;
893                 if (rt.rt_dev) {
894                         char name[IFNAMSIZ];
895                         if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
896                                 return -EFAULT;
897                         name[IFNAMSIZ-1] = '\0';
898                         dev = __dev_get_by_name(&init_net, name);
899                         if (!dev)
900                                 return -ENODEV;
901                 }
902                 return atrtr_create(&rt, dev);
903         }
904         }
905         return -EINVAL;
906 }
907 
908 /**************************************************************************\
909 *                                                                          *
910 * Handling for system calls applied via the various interfaces to an       *
911 * AppleTalk socket object.                                                 *
912 *                                                                          *
913 \**************************************************************************/
914 
915 /*
916  * Checksum: This is 'optional'. It's quite likely also a good
917  * candidate for assembler hackery 8)
918  */
919 static unsigned long atalk_sum_partial(const unsigned char *data,
920                                        int len, unsigned long sum)
921 {
922         /* This ought to be unwrapped neatly. I'll trust gcc for now */
923         while (len--) {
924                 sum += *data++;
925                 sum = rol16(sum, 1);
926         }
927         return sum;
928 }
929 
930 /*  Checksum skb data --  similar to skb_checksum  */
931 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
932                                    int len, unsigned long sum)
933 {
934         int start = skb_headlen(skb);
935         struct sk_buff *frag_iter;
936         int i, copy;
937 
938         /* checksum stuff in header space */
939         if ((copy = start - offset) > 0) {
940                 if (copy > len)
941                         copy = len;
942                 sum = atalk_sum_partial(skb->data + offset, copy, sum);
943                 if ((len -= copy) == 0)
944                         return sum;
945 
946                 offset += copy;
947         }
948 
949         /* checksum stuff in frags */
950         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
951                 int end;
952                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
953                 WARN_ON(start > offset + len);
954 
955                 end = start + skb_frag_size(frag);
956                 if ((copy = end - offset) > 0) {
957                         u8 *vaddr;
958 
959                         if (copy > len)
960                                 copy = len;
961                         vaddr = kmap_atomic(skb_frag_page(frag));
962                         sum = atalk_sum_partial(vaddr + frag->page_offset +
963                                                   offset - start, copy, sum);
964                         kunmap_atomic(vaddr);
965 
966                         if (!(len -= copy))
967                                 return sum;
968                         offset += copy;
969                 }
970                 start = end;
971         }
972 
973         skb_walk_frags(skb, frag_iter) {
974                 int end;
975 
976                 WARN_ON(start > offset + len);
977 
978                 end = start + frag_iter->len;
979                 if ((copy = end - offset) > 0) {
980                         if (copy > len)
981                                 copy = len;
982                         sum = atalk_sum_skb(frag_iter, offset - start,
983                                             copy, sum);
984                         if ((len -= copy) == 0)
985                                 return sum;
986                         offset += copy;
987                 }
988                 start = end;
989         }
990 
991         BUG_ON(len > 0);
992 
993         return sum;
994 }
995 
996 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
997 {
998         unsigned long sum;
999 
1000         /* skip header 4 bytes */
1001         sum = atalk_sum_skb(skb, 4, len-4, 0);
1002 
1003         /* Use 0xFFFF for 0. 0 itself means none */
1004         return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1005 }
1006 
1007 static struct proto ddp_proto = {
1008         .name     = "DDP",
1009         .owner    = THIS_MODULE,
1010         .obj_size = sizeof(struct atalk_sock),
1011 };
1012 
1013 /*
1014  * Create a socket. Initialise the socket, blank the addresses
1015  * set the state.
1016  */
1017 static int atalk_create(struct net *net, struct socket *sock, int protocol,
1018                         int kern)
1019 {
1020         struct sock *sk;
1021         int rc = -ESOCKTNOSUPPORT;
1022 
1023         if (!net_eq(net, &init_net))
1024                 return -EAFNOSUPPORT;
1025 
1026         /*
1027          * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1028          * and gives you the full ELAP frame. Should be handy for CAP 8)
1029          */
1030         if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1031                 goto out;
1032         rc = -ENOMEM;
1033         sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto);
1034         if (!sk)
1035                 goto out;
1036         rc = 0;
1037         sock->ops = &atalk_dgram_ops;
1038         sock_init_data(sock, sk);
1039 
1040         /* Checksums on by default */
1041         sock_set_flag(sk, SOCK_ZAPPED);
1042 out:
1043         return rc;
1044 }
1045 
1046 /* Free a socket. No work needed */
1047 static int atalk_release(struct socket *sock)
1048 {
1049         struct sock *sk = sock->sk;
1050 
1051         if (sk) {
1052                 sock_hold(sk);
1053                 lock_sock(sk);
1054 
1055                 sock_orphan(sk);
1056                 sock->sk = NULL;
1057                 atalk_destroy_socket(sk);
1058 
1059                 release_sock(sk);
1060                 sock_put(sk);
1061         }
1062         return 0;
1063 }
1064 
1065 /**
1066  * atalk_pick_and_bind_port - Pick a source port when one is not given
1067  * @sk: socket to insert into the tables
1068  * @sat: address to search for
1069  *
1070  * Pick a source port when one is not given. If we can find a suitable free
1071  * one, we insert the socket into the tables using it.
1072  *
1073  * This whole operation must be atomic.
1074  */
1075 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1076 {
1077         int retval;
1078 
1079         write_lock_bh(&atalk_sockets_lock);
1080 
1081         for (sat->sat_port = ATPORT_RESERVED;
1082              sat->sat_port < ATPORT_LAST;
1083              sat->sat_port++) {
1084                 struct sock *s;
1085 
1086                 sk_for_each(s, &atalk_sockets) {
1087                         struct atalk_sock *at = at_sk(s);
1088 
1089                         if (at->src_net == sat->sat_addr.s_net &&
1090                             at->src_node == sat->sat_addr.s_node &&
1091                             at->src_port == sat->sat_port)
1092                                 goto try_next_port;
1093                 }
1094 
1095                 /* Wheee, it's free, assign and insert. */
1096                 __atalk_insert_socket(sk);
1097                 at_sk(sk)->src_port = sat->sat_port;
1098                 retval = 0;
1099                 goto out;
1100 
1101 try_next_port:;
1102         }
1103 
1104         retval = -EBUSY;
1105 out:
1106         write_unlock_bh(&atalk_sockets_lock);
1107         return retval;
1108 }
1109 
1110 static int atalk_autobind(struct sock *sk)
1111 {
1112         struct atalk_sock *at = at_sk(sk);
1113         struct sockaddr_at sat;
1114         struct atalk_addr *ap = atalk_find_primary();
1115         int n = -EADDRNOTAVAIL;
1116 
1117         if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1118                 goto out;
1119 
1120         at->src_net  = sat.sat_addr.s_net  = ap->s_net;
1121         at->src_node = sat.sat_addr.s_node = ap->s_node;
1122 
1123         n = atalk_pick_and_bind_port(sk, &sat);
1124         if (!n)
1125                 sock_reset_flag(sk, SOCK_ZAPPED);
1126 out:
1127         return n;
1128 }
1129 
1130 /* Set the address 'our end' of the connection */
1131 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1132 {
1133         struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1134         struct sock *sk = sock->sk;
1135         struct atalk_sock *at = at_sk(sk);
1136         int err;
1137 
1138         if (!sock_flag(sk, SOCK_ZAPPED) ||
1139             addr_len != sizeof(struct sockaddr_at))
1140                 return -EINVAL;
1141 
1142         if (addr->sat_family != AF_APPLETALK)
1143                 return -EAFNOSUPPORT;
1144 
1145         lock_sock(sk);
1146         if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1147                 struct atalk_addr *ap = atalk_find_primary();
1148 
1149                 err = -EADDRNOTAVAIL;
1150                 if (!ap)
1151                         goto out;
1152 
1153                 at->src_net  = addr->sat_addr.s_net = ap->s_net;
1154                 at->src_node = addr->sat_addr.s_node = ap->s_node;
1155         } else {
1156                 err = -EADDRNOTAVAIL;
1157                 if (!atalk_find_interface(addr->sat_addr.s_net,
1158                                           addr->sat_addr.s_node))
1159                         goto out;
1160 
1161                 at->src_net  = addr->sat_addr.s_net;
1162                 at->src_node = addr->sat_addr.s_node;
1163         }
1164 
1165         if (addr->sat_port == ATADDR_ANYPORT) {
1166                 err = atalk_pick_and_bind_port(sk, addr);
1167 
1168                 if (err < 0)
1169                         goto out;
1170         } else {
1171                 at->src_port = addr->sat_port;
1172 
1173                 err = -EADDRINUSE;
1174                 if (atalk_find_or_insert_socket(sk, addr))
1175                         goto out;
1176         }
1177 
1178         sock_reset_flag(sk, SOCK_ZAPPED);
1179         err = 0;
1180 out:
1181         release_sock(sk);
1182         return err;
1183 }
1184 
1185 /* Set the address we talk to */
1186 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1187                          int addr_len, int flags)
1188 {
1189         struct sock *sk = sock->sk;
1190         struct atalk_sock *at = at_sk(sk);
1191         struct sockaddr_at *addr;
1192         int err;
1193 
1194         sk->sk_state   = TCP_CLOSE;
1195         sock->state = SS_UNCONNECTED;
1196 
1197         if (addr_len != sizeof(*addr))
1198                 return -EINVAL;
1199 
1200         addr = (struct sockaddr_at *)uaddr;
1201 
1202         if (addr->sat_family != AF_APPLETALK)
1203                 return -EAFNOSUPPORT;
1204 
1205         if (addr->sat_addr.s_node == ATADDR_BCAST &&
1206             !sock_flag(sk, SOCK_BROADCAST)) {
1207 #if 1
1208                 pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n",
1209                         current->comm);
1210 #else
1211                 return -EACCES;
1212 #endif
1213         }
1214 
1215         lock_sock(sk);
1216         err = -EBUSY;
1217         if (sock_flag(sk, SOCK_ZAPPED))
1218                 if (atalk_autobind(sk) < 0)
1219                         goto out;
1220 
1221         err = -ENETUNREACH;
1222         if (!atrtr_get_dev(&addr->sat_addr))
1223                 goto out;
1224 
1225         at->dest_port = addr->sat_port;
1226         at->dest_net  = addr->sat_addr.s_net;
1227         at->dest_node = addr->sat_addr.s_node;
1228 
1229         sock->state  = SS_CONNECTED;
1230         sk->sk_state = TCP_ESTABLISHED;
1231         err = 0;
1232 out:
1233         release_sock(sk);
1234         return err;
1235 }
1236 
1237 /*
1238  * Find the name of an AppleTalk socket. Just copy the right
1239  * fields into the sockaddr.
1240  */
1241 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1242                          int *uaddr_len, int peer)
1243 {
1244         struct sockaddr_at sat;
1245         struct sock *sk = sock->sk;
1246         struct atalk_sock *at = at_sk(sk);
1247         int err;
1248 
1249         lock_sock(sk);
1250         err = -ENOBUFS;
1251         if (sock_flag(sk, SOCK_ZAPPED))
1252                 if (atalk_autobind(sk) < 0)
1253                         goto out;
1254 
1255         *uaddr_len = sizeof(struct sockaddr_at);
1256         memset(&sat, 0, sizeof(sat));
1257 
1258         if (peer) {
1259                 err = -ENOTCONN;
1260                 if (sk->sk_state != TCP_ESTABLISHED)
1261                         goto out;
1262 
1263                 sat.sat_addr.s_net  = at->dest_net;
1264                 sat.sat_addr.s_node = at->dest_node;
1265                 sat.sat_port        = at->dest_port;
1266         } else {
1267                 sat.sat_addr.s_net  = at->src_net;
1268                 sat.sat_addr.s_node = at->src_node;
1269                 sat.sat_port        = at->src_port;
1270         }
1271 
1272         err = 0;
1273         sat.sat_family = AF_APPLETALK;
1274         memcpy(uaddr, &sat, sizeof(sat));
1275 
1276 out:
1277         release_sock(sk);
1278         return err;
1279 }
1280 
1281 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1282 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1283 {
1284         return skb->data[12] == 22;
1285 }
1286 
1287 static int handle_ip_over_ddp(struct sk_buff *skb)
1288 {
1289         struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
1290         struct net_device_stats *stats;
1291 
1292         /* This needs to be able to handle ipddp"N" devices */
1293         if (!dev) {
1294                 kfree_skb(skb);
1295                 return NET_RX_DROP;
1296         }
1297 
1298         skb->protocol = htons(ETH_P_IP);
1299         skb_pull(skb, 13);
1300         skb->dev   = dev;
1301         skb_reset_transport_header(skb);
1302 
1303         stats = netdev_priv(dev);
1304         stats->rx_packets++;
1305         stats->rx_bytes += skb->len + 13;
1306         return netif_rx(skb);  /* Send the SKB up to a higher place. */
1307 }
1308 #else
1309 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1310 #define is_ip_over_ddp(skb) 0
1311 #define handle_ip_over_ddp(skb) 0
1312 #endif
1313 
1314 static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1315                               struct ddpehdr *ddp, __u16 len_hops, int origlen)
1316 {
1317         struct atalk_route *rt;
1318         struct atalk_addr ta;
1319 
1320         /*
1321          * Don't route multicast, etc., packets, or packets sent to "this
1322          * network"
1323          */
1324         if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1325                 /*
1326                  * FIXME:
1327                  *
1328                  * Can it ever happen that a packet is from a PPP iface and
1329                  * needs to be broadcast onto the default network?
1330                  */
1331                 if (dev->type == ARPHRD_PPP)
1332                         printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1333                                           "packet received from PPP iface\n");
1334                 goto free_it;
1335         }
1336 
1337         ta.s_net  = ddp->deh_dnet;
1338         ta.s_node = ddp->deh_dnode;
1339 
1340         /* Route the packet */
1341         rt = atrtr_find(&ta);
1342         /* increment hops count */
1343         len_hops += 1 << 10;
1344         if (!rt || !(len_hops & (15 << 10)))
1345                 goto free_it;
1346 
1347         /* FIXME: use skb->cb to be able to use shared skbs */
1348 
1349         /*
1350          * Route goes through another gateway, so set the target to the
1351          * gateway instead.
1352          */
1353 
1354         if (rt->flags & RTF_GATEWAY) {
1355                 ta.s_net  = rt->gateway.s_net;
1356                 ta.s_node = rt->gateway.s_node;
1357         }
1358 
1359         /* Fix up skb->len field */
1360         skb_trim(skb, min_t(unsigned int, origlen,
1361                             (rt->dev->hard_header_len +
1362                              ddp_dl->header_length + (len_hops & 1023))));
1363 
1364         /* FIXME: use skb->cb to be able to use shared skbs */
1365         ddp->deh_len_hops = htons(len_hops);
1366 
1367         /*
1368          * Send the buffer onwards
1369          *
1370          * Now we must always be careful. If it's come from LocalTalk to
1371          * EtherTalk it might not fit
1372          *
1373          * Order matters here: If a packet has to be copied to make a new
1374          * headroom (rare hopefully) then it won't need unsharing.
1375          *
1376          * Note. ddp-> becomes invalid at the realloc.
1377          */
1378         if (skb_headroom(skb) < 22) {
1379                 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1380                 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1381                 kfree_skb(skb);
1382                 skb = nskb;
1383         } else
1384                 skb = skb_unshare(skb, GFP_ATOMIC);
1385 
1386         /*
1387          * If the buffer didn't vanish into the lack of space bitbucket we can
1388          * send it.
1389          */
1390         if (skb == NULL)
1391                 goto drop;
1392 
1393         if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
1394                 return NET_RX_DROP;
1395         return NET_RX_SUCCESS;
1396 free_it:
1397         kfree_skb(skb);
1398 drop:
1399         return NET_RX_DROP;
1400 }
1401 
1402 /**
1403  *      atalk_rcv - Receive a packet (in skb) from device dev
1404  *      @skb - packet received
1405  *      @dev - network device where the packet comes from
1406  *      @pt - packet type
1407  *
1408  *      Receive a packet (in skb) from device dev. This has come from the SNAP
1409  *      decoder, and on entry skb->transport_header is the DDP header, skb->len
1410  *      is the DDP header, skb->len is the DDP length. The physical headers
1411  *      have been extracted. PPP should probably pass frames marked as for this
1412  *      layer.  [ie ARPHRD_ETHERTALK]
1413  */
1414 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1415                      struct packet_type *pt, struct net_device *orig_dev)
1416 {
1417         struct ddpehdr *ddp;
1418         struct sock *sock;
1419         struct atalk_iface *atif;
1420         struct sockaddr_at tosat;
1421         int origlen;
1422         __u16 len_hops;
1423 
1424         if (!net_eq(dev_net(dev), &init_net))
1425                 goto drop;
1426 
1427         /* Don't mangle buffer if shared */
1428         if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1429                 goto out;
1430 
1431         /* Size check and make sure header is contiguous */
1432         if (!pskb_may_pull(skb, sizeof(*ddp)))
1433                 goto drop;
1434 
1435         ddp = ddp_hdr(skb);
1436 
1437         len_hops = ntohs(ddp->deh_len_hops);
1438 
1439         /* Trim buffer in case of stray trailing data */
1440         origlen = skb->len;
1441         skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1442 
1443         /*
1444          * Size check to see if ddp->deh_len was crap
1445          * (Otherwise we'll detonate most spectacularly
1446          * in the middle of atalk_checksum() or recvmsg()).
1447          */
1448         if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1449                 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1450                          "skb->len=%u)\n", len_hops & 1023, skb->len);
1451                 goto drop;
1452         }
1453 
1454         /*
1455          * Any checksums. Note we don't do htons() on this == is assumed to be
1456          * valid for net byte orders all over the networking code...
1457          */
1458         if (ddp->deh_sum &&
1459             atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1460                 /* Not a valid AppleTalk frame - dustbin time */
1461                 goto drop;
1462 
1463         /* Check the packet is aimed at us */
1464         if (!ddp->deh_dnet)     /* Net 0 is 'this network' */
1465                 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1466         else
1467                 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1468 
1469         if (!atif) {
1470                 /* Not ours, so we route the packet via the correct
1471                  * AppleTalk iface
1472                  */
1473                 return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1474         }
1475 
1476         /* if IP over DDP is not selected this code will be optimized out */
1477         if (is_ip_over_ddp(skb))
1478                 return handle_ip_over_ddp(skb);
1479         /*
1480          * Which socket - atalk_search_socket() looks for a *full match*
1481          * of the <net, node, port> tuple.
1482          */
1483         tosat.sat_addr.s_net  = ddp->deh_dnet;
1484         tosat.sat_addr.s_node = ddp->deh_dnode;
1485         tosat.sat_port        = ddp->deh_dport;
1486 
1487         sock = atalk_search_socket(&tosat, atif);
1488         if (!sock) /* But not one of our sockets */
1489                 goto drop;
1490 
1491         /* Queue packet (standard) */
1492         if (sock_queue_rcv_skb(sock, skb) < 0)
1493                 goto drop;
1494 
1495         return NET_RX_SUCCESS;
1496 
1497 drop:
1498         kfree_skb(skb);
1499 out:
1500         return NET_RX_DROP;
1501 
1502 }
1503 
1504 /*
1505  * Receive a LocalTalk frame. We make some demands on the caller here.
1506  * Caller must provide enough headroom on the packet to pull the short
1507  * header and append a long one.
1508  */
1509 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1510                      struct packet_type *pt, struct net_device *orig_dev)
1511 {
1512         if (!net_eq(dev_net(dev), &init_net))
1513                 goto freeit;
1514 
1515         /* Expand any short form frames */
1516         if (skb_mac_header(skb)[2] == 1) {
1517                 struct ddpehdr *ddp;
1518                 /* Find our address */
1519                 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1520 
1521                 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1522                         goto freeit;
1523 
1524                 /* Don't mangle buffer if shared */
1525                 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1526                         return 0;
1527 
1528                 /*
1529                  * The push leaves us with a ddephdr not an shdr, and
1530                  * handily the port bytes in the right place preset.
1531                  */
1532                 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1533 
1534                 /* Now fill in the long header */
1535 
1536                 /*
1537                  * These two first. The mac overlays the new source/dest
1538                  * network information so we MUST copy these before
1539                  * we write the network numbers !
1540                  */
1541 
1542                 ddp->deh_dnode = skb_mac_header(skb)[0];     /* From physical header */
1543                 ddp->deh_snode = skb_mac_header(skb)[1];     /* From physical header */
1544 
1545                 ddp->deh_dnet  = ap->s_net;     /* Network number */
1546                 ddp->deh_snet  = ap->s_net;
1547                 ddp->deh_sum   = 0;             /* No checksum */
1548                 /*
1549                  * Not sure about this bit...
1550                  */
1551                 /* Non routable, so force a drop if we slip up later */
1552                 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1553         }
1554         skb_reset_transport_header(skb);
1555 
1556         return atalk_rcv(skb, dev, pt, orig_dev);
1557 freeit:
1558         kfree_skb(skb);
1559         return 0;
1560 }
1561 
1562 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1563                          size_t len)
1564 {
1565         struct sock *sk = sock->sk;
1566         struct atalk_sock *at = at_sk(sk);
1567         DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name);
1568         int flags = msg->msg_flags;
1569         int loopback = 0;
1570         struct sockaddr_at local_satalk, gsat;
1571         struct sk_buff *skb;
1572         struct net_device *dev;
1573         struct ddpehdr *ddp;
1574         int size;
1575         struct atalk_route *rt;
1576         int err;
1577 
1578         if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1579                 return -EINVAL;
1580 
1581         if (len > DDP_MAXSZ)
1582                 return -EMSGSIZE;
1583 
1584         lock_sock(sk);
1585         if (usat) {
1586                 err = -EBUSY;
1587                 if (sock_flag(sk, SOCK_ZAPPED))
1588                         if (atalk_autobind(sk) < 0)
1589                                 goto out;
1590 
1591                 err = -EINVAL;
1592                 if (msg->msg_namelen < sizeof(*usat) ||
1593                     usat->sat_family != AF_APPLETALK)
1594                         goto out;
1595 
1596                 err = -EPERM;
1597                 /* netatalk didn't implement this check */
1598                 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1599                     !sock_flag(sk, SOCK_BROADCAST)) {
1600                         goto out;
1601                 }
1602         } else {
1603                 err = -ENOTCONN;
1604                 if (sk->sk_state != TCP_ESTABLISHED)
1605                         goto out;
1606                 usat = &local_satalk;
1607                 usat->sat_family      = AF_APPLETALK;
1608                 usat->sat_port        = at->dest_port;
1609                 usat->sat_addr.s_node = at->dest_node;
1610                 usat->sat_addr.s_net  = at->dest_net;
1611         }
1612 
1613         /* Build a packet */
1614         SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1615 
1616         /* For headers */
1617         size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1618 
1619         if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1620                 rt = atrtr_find(&usat->sat_addr);
1621         } else {
1622                 struct atalk_addr at_hint;
1623 
1624                 at_hint.s_node = 0;
1625                 at_hint.s_net  = at->src_net;
1626 
1627                 rt = atrtr_find(&at_hint);
1628         }
1629         err = ENETUNREACH;
1630         if (!rt)
1631                 goto out;
1632 
1633         dev = rt->dev;
1634 
1635         SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1636                         sk, size, dev->name);
1637 
1638         size += dev->hard_header_len;
1639         release_sock(sk);
1640         skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1641         lock_sock(sk);
1642         if (!skb)
1643                 goto out;
1644 
1645         skb_reserve(skb, ddp_dl->header_length);
1646         skb_reserve(skb, dev->hard_header_len);
1647         skb->dev = dev;
1648 
1649         SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1650 
1651         ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1652         ddp->deh_len_hops  = htons(len + sizeof(*ddp));
1653         ddp->deh_dnet  = usat->sat_addr.s_net;
1654         ddp->deh_snet  = at->src_net;
1655         ddp->deh_dnode = usat->sat_addr.s_node;
1656         ddp->deh_snode = at->src_node;
1657         ddp->deh_dport = usat->sat_port;
1658         ddp->deh_sport = at->src_port;
1659 
1660         SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1661 
1662         err = memcpy_from_msg(skb_put(skb, len), msg, len);
1663         if (err) {
1664                 kfree_skb(skb);
1665                 err = -EFAULT;
1666                 goto out;
1667         }
1668 
1669         if (sk->sk_no_check_tx)
1670                 ddp->deh_sum = 0;
1671         else
1672                 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1673 
1674         /*
1675          * Loopback broadcast packets to non gateway targets (ie routes
1676          * to group we are in)
1677          */
1678         if (ddp->deh_dnode == ATADDR_BCAST &&
1679             !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1680                 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1681 
1682                 if (skb2) {
1683                         loopback = 1;
1684                         SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1685                         /*
1686                          * If it fails it is queued/sent above in the aarp queue
1687                          */
1688                         aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
1689                 }
1690         }
1691 
1692         if (dev->flags & IFF_LOOPBACK || loopback) {
1693                 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1694                 /* loop back */
1695                 skb_orphan(skb);
1696                 if (ddp->deh_dnode == ATADDR_BCAST) {
1697                         struct atalk_addr at_lo;
1698 
1699                         at_lo.s_node = 0;
1700                         at_lo.s_net  = 0;
1701 
1702                         rt = atrtr_find(&at_lo);
1703                         if (!rt) {
1704                                 kfree_skb(skb);
1705                                 err = -ENETUNREACH;
1706                                 goto out;
1707                         }
1708                         dev = rt->dev;
1709                         skb->dev = dev;
1710                 }
1711                 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1712         } else {
1713                 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1714                 if (rt->flags & RTF_GATEWAY) {
1715                     gsat.sat_addr = rt->gateway;
1716                     usat = &gsat;
1717                 }
1718 
1719                 /*
1720                  * If it fails it is queued/sent above in the aarp queue
1721                  */
1722                 aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
1723         }
1724         SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1725 
1726 out:
1727         release_sock(sk);
1728         return err ? : len;
1729 }
1730 
1731 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1732                          size_t size, int flags)
1733 {
1734         struct sock *sk = sock->sk;
1735         struct ddpehdr *ddp;
1736         int copied = 0;
1737         int offset = 0;
1738         int err = 0;
1739         struct sk_buff *skb;
1740 
1741         skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1742                                                 flags & MSG_DONTWAIT, &err);
1743         lock_sock(sk);
1744 
1745         if (!skb)
1746                 goto out;
1747 
1748         /* FIXME: use skb->cb to be able to use shared skbs */
1749         ddp = ddp_hdr(skb);
1750         copied = ntohs(ddp->deh_len_hops) & 1023;
1751 
1752         if (sk->sk_type != SOCK_RAW) {
1753                 offset = sizeof(*ddp);
1754                 copied -= offset;
1755         }
1756 
1757         if (copied > size) {
1758                 copied = size;
1759                 msg->msg_flags |= MSG_TRUNC;
1760         }
1761         err = skb_copy_datagram_msg(skb, offset, msg, copied);
1762 
1763         if (!err && msg->msg_name) {
1764                 DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name);
1765                 sat->sat_family      = AF_APPLETALK;
1766                 sat->sat_port        = ddp->deh_sport;
1767                 sat->sat_addr.s_node = ddp->deh_snode;
1768                 sat->sat_addr.s_net  = ddp->deh_snet;
1769                 msg->msg_namelen     = sizeof(*sat);
1770         }
1771 
1772         skb_free_datagram(sk, skb);     /* Free the datagram. */
1773 
1774 out:
1775         release_sock(sk);
1776         return err ? : copied;
1777 }
1778 
1779 
1780 /*
1781  * AppleTalk ioctl calls.
1782  */
1783 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1784 {
1785         int rc = -ENOIOCTLCMD;
1786         struct sock *sk = sock->sk;
1787         void __user *argp = (void __user *)arg;
1788 
1789         switch (cmd) {
1790         /* Protocol layer */
1791         case TIOCOUTQ: {
1792                 long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1793 
1794                 if (amount < 0)
1795                         amount = 0;
1796                 rc = put_user(amount, (int __user *)argp);
1797                 break;
1798         }
1799         case TIOCINQ: {
1800                 /*
1801                  * These two are safe on a single CPU system as only
1802                  * user tasks fiddle here
1803                  */
1804                 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1805                 long amount = 0;
1806 
1807                 if (skb)
1808                         amount = skb->len - sizeof(struct ddpehdr);
1809                 rc = put_user(amount, (int __user *)argp);
1810                 break;
1811         }
1812         case SIOCGSTAMP:
1813                 rc = sock_get_timestamp(sk, argp);
1814                 break;
1815         case SIOCGSTAMPNS:
1816                 rc = sock_get_timestampns(sk, argp);
1817                 break;
1818         /* Routing */
1819         case SIOCADDRT:
1820         case SIOCDELRT:
1821                 rc = -EPERM;
1822                 if (capable(CAP_NET_ADMIN))
1823                         rc = atrtr_ioctl(cmd, argp);
1824                 break;
1825         /* Interface */
1826         case SIOCGIFADDR:
1827         case SIOCSIFADDR:
1828         case SIOCGIFBRDADDR:
1829         case SIOCATALKDIFADDR:
1830         case SIOCDIFADDR:
1831         case SIOCSARP:          /* proxy AARP */
1832         case SIOCDARP:          /* proxy AARP */
1833                 rtnl_lock();
1834                 rc = atif_ioctl(cmd, argp);
1835                 rtnl_unlock();
1836                 break;
1837         }
1838 
1839         return rc;
1840 }
1841 
1842 
1843 #ifdef CONFIG_COMPAT
1844 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1845 {
1846         /*
1847          * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
1848          * cannot handle it in common code. The data we access if ifreq
1849          * here is compatible, so we can simply call the native
1850          * handler.
1851          */
1852         if (cmd == SIOCATALKDIFADDR)
1853                 return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1854 
1855         return -ENOIOCTLCMD;
1856 }
1857 #endif
1858 
1859 
1860 static const struct net_proto_family atalk_family_ops = {
1861         .family         = PF_APPLETALK,
1862         .create         = atalk_create,
1863         .owner          = THIS_MODULE,
1864 };
1865 
1866 static const struct proto_ops atalk_dgram_ops = {
1867         .family         = PF_APPLETALK,
1868         .owner          = THIS_MODULE,
1869         .release        = atalk_release,
1870         .bind           = atalk_bind,
1871         .connect        = atalk_connect,
1872         .socketpair     = sock_no_socketpair,
1873         .accept         = sock_no_accept,
1874         .getname        = atalk_getname,
1875         .poll           = datagram_poll,
1876         .ioctl          = atalk_ioctl,
1877 #ifdef CONFIG_COMPAT
1878         .compat_ioctl   = atalk_compat_ioctl,
1879 #endif
1880         .listen         = sock_no_listen,
1881         .shutdown       = sock_no_shutdown,
1882         .setsockopt     = sock_no_setsockopt,
1883         .getsockopt     = sock_no_getsockopt,
1884         .sendmsg        = atalk_sendmsg,
1885         .recvmsg        = atalk_recvmsg,
1886         .mmap           = sock_no_mmap,
1887         .sendpage       = sock_no_sendpage,
1888 };
1889 
1890 static struct notifier_block ddp_notifier = {
1891         .notifier_call  = ddp_device_event,
1892 };
1893 
1894 static struct packet_type ltalk_packet_type __read_mostly = {
1895         .type           = cpu_to_be16(ETH_P_LOCALTALK),
1896         .func           = ltalk_rcv,
1897 };
1898 
1899 static struct packet_type ppptalk_packet_type __read_mostly = {
1900         .type           = cpu_to_be16(ETH_P_PPPTALK),
1901         .func           = atalk_rcv,
1902 };
1903 
1904 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1905 
1906 /* Export symbols for use by drivers when AppleTalk is a module */
1907 EXPORT_SYMBOL(atrtr_get_dev);
1908 EXPORT_SYMBOL(atalk_find_dev_addr);
1909 
1910 static const char atalk_err_snap[] __initconst =
1911         KERN_CRIT "Unable to register DDP with SNAP.\n";
1912 
1913 /* Called by proto.c on kernel start up */
1914 static int __init atalk_init(void)
1915 {
1916         int rc = proto_register(&ddp_proto, 0);
1917 
1918         if (rc != 0)
1919                 goto out;
1920 
1921         (void)sock_register(&atalk_family_ops);
1922         ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1923         if (!ddp_dl)
1924                 printk(atalk_err_snap);
1925 
1926         dev_add_pack(&ltalk_packet_type);
1927         dev_add_pack(&ppptalk_packet_type);
1928 
1929         register_netdevice_notifier(&ddp_notifier);
1930         aarp_proto_init();
1931         atalk_proc_init();
1932         atalk_register_sysctl();
1933 out:
1934         return rc;
1935 }
1936 module_init(atalk_init);
1937 
1938 /*
1939  * No explicit module reference count manipulation is needed in the
1940  * protocol. Socket layer sets module reference count for us
1941  * and interfaces reference counting is done
1942  * by the network device layer.
1943  *
1944  * Ergo, before the AppleTalk module can be removed, all AppleTalk
1945  * sockets be closed from user space.
1946  */
1947 static void __exit atalk_exit(void)
1948 {
1949 #ifdef CONFIG_SYSCTL
1950         atalk_unregister_sysctl();
1951 #endif /* CONFIG_SYSCTL */
1952         atalk_proc_exit();
1953         aarp_cleanup_module();  /* General aarp clean-up. */
1954         unregister_netdevice_notifier(&ddp_notifier);
1955         dev_remove_pack(&ltalk_packet_type);
1956         dev_remove_pack(&ppptalk_packet_type);
1957         unregister_snap_client(ddp_dl);
1958         sock_unregister(PF_APPLETALK);
1959         proto_unregister(&ddp_proto);
1960 }
1961 module_exit(atalk_exit);
1962 
1963 MODULE_LICENSE("GPL");
1964 MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
1965 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1966 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
1967 

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