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TOMOYO Linux Cross Reference
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(struct timer_list *t)
162 {
163         struct sock *sk = from_timer(sk, t, sk_timer);
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                 timer_setup(&sk->sk_timer, atalk_destroy_timer, 0);
179                 sk->sk_timer.expires    = jiffies + SOCK_DESTROY_TIME;
180                 add_timer(&sk->sk_timer);
181         } else
182                 sock_put(sk);
183 }
184 
185 /**************************************************************************\
186 *                                                                          *
187 * Routing tables for the AppleTalk socket layer.                           *
188 *                                                                          *
189 \**************************************************************************/
190 
191 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
192 struct atalk_route *atalk_routes;
193 DEFINE_RWLOCK(atalk_routes_lock);
194 
195 struct atalk_iface *atalk_interfaces;
196 DEFINE_RWLOCK(atalk_interfaces_lock);
197 
198 /* For probing devices or in a routerless network */
199 struct atalk_route atrtr_default;
200 
201 /* AppleTalk interface control */
202 /*
203  * Drop a device. Doesn't drop any of its routes - that is the caller's
204  * problem. Called when we down the interface or delete the address.
205  */
206 static void atif_drop_device(struct net_device *dev)
207 {
208         struct atalk_iface **iface = &atalk_interfaces;
209         struct atalk_iface *tmp;
210 
211         write_lock_bh(&atalk_interfaces_lock);
212         while ((tmp = *iface) != NULL) {
213                 if (tmp->dev == dev) {
214                         *iface = tmp->next;
215                         dev_put(dev);
216                         kfree(tmp);
217                         dev->atalk_ptr = NULL;
218                 } else
219                         iface = &tmp->next;
220         }
221         write_unlock_bh(&atalk_interfaces_lock);
222 }
223 
224 static struct atalk_iface *atif_add_device(struct net_device *dev,
225                                            struct atalk_addr *sa)
226 {
227         struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
228 
229         if (!iface)
230                 goto out;
231 
232         dev_hold(dev);
233         iface->dev = dev;
234         dev->atalk_ptr = iface;
235         iface->address = *sa;
236         iface->status = 0;
237 
238         write_lock_bh(&atalk_interfaces_lock);
239         iface->next = atalk_interfaces;
240         atalk_interfaces = iface;
241         write_unlock_bh(&atalk_interfaces_lock);
242 out:
243         return iface;
244 }
245 
246 /* Perform phase 2 AARP probing on our tentative address */
247 static int atif_probe_device(struct atalk_iface *atif)
248 {
249         int netrange = ntohs(atif->nets.nr_lastnet) -
250                         ntohs(atif->nets.nr_firstnet) + 1;
251         int probe_net = ntohs(atif->address.s_net);
252         int probe_node = atif->address.s_node;
253         int netct, nodect;
254 
255         /* Offset the network we start probing with */
256         if (probe_net == ATADDR_ANYNET) {
257                 probe_net = ntohs(atif->nets.nr_firstnet);
258                 if (netrange)
259                         probe_net += jiffies % netrange;
260         }
261         if (probe_node == ATADDR_ANYNODE)
262                 probe_node = jiffies & 0xFF;
263 
264         /* Scan the networks */
265         atif->status |= ATIF_PROBE;
266         for (netct = 0; netct <= netrange; netct++) {
267                 /* Sweep the available nodes from a given start */
268                 atif->address.s_net = htons(probe_net);
269                 for (nodect = 0; nodect < 256; nodect++) {
270                         atif->address.s_node = (nodect + probe_node) & 0xFF;
271                         if (atif->address.s_node > 0 &&
272                             atif->address.s_node < 254) {
273                                 /* Probe a proposed address */
274                                 aarp_probe_network(atif);
275 
276                                 if (!(atif->status & ATIF_PROBE_FAIL)) {
277                                         atif->status &= ~ATIF_PROBE;
278                                         return 0;
279                                 }
280                         }
281                         atif->status &= ~ATIF_PROBE_FAIL;
282                 }
283                 probe_net++;
284                 if (probe_net > ntohs(atif->nets.nr_lastnet))
285                         probe_net = ntohs(atif->nets.nr_firstnet);
286         }
287         atif->status &= ~ATIF_PROBE;
288 
289         return -EADDRINUSE;     /* Network is full... */
290 }
291 
292 
293 /* Perform AARP probing for a proxy address */
294 static int atif_proxy_probe_device(struct atalk_iface *atif,
295                                    struct atalk_addr *proxy_addr)
296 {
297         int netrange = ntohs(atif->nets.nr_lastnet) -
298                         ntohs(atif->nets.nr_firstnet) + 1;
299         /* we probe the interface's network */
300         int probe_net = ntohs(atif->address.s_net);
301         int probe_node = ATADDR_ANYNODE;            /* we'll take anything */
302         int netct, nodect;
303 
304         /* Offset the network we start probing with */
305         if (probe_net == ATADDR_ANYNET) {
306                 probe_net = ntohs(atif->nets.nr_firstnet);
307                 if (netrange)
308                         probe_net += jiffies % netrange;
309         }
310 
311         if (probe_node == ATADDR_ANYNODE)
312                 probe_node = jiffies & 0xFF;
313 
314         /* Scan the networks */
315         for (netct = 0; netct <= netrange; netct++) {
316                 /* Sweep the available nodes from a given start */
317                 proxy_addr->s_net = htons(probe_net);
318                 for (nodect = 0; nodect < 256; nodect++) {
319                         proxy_addr->s_node = (nodect + probe_node) & 0xFF;
320                         if (proxy_addr->s_node > 0 &&
321                             proxy_addr->s_node < 254) {
322                                 /* Tell AARP to probe a proposed address */
323                                 int ret = aarp_proxy_probe_network(atif,
324                                                                     proxy_addr);
325 
326                                 if (ret != -EADDRINUSE)
327                                         return ret;
328                         }
329                 }
330                 probe_net++;
331                 if (probe_net > ntohs(atif->nets.nr_lastnet))
332                         probe_net = ntohs(atif->nets.nr_firstnet);
333         }
334 
335         return -EADDRINUSE;     /* Network is full... */
336 }
337 
338 
339 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
340 {
341         struct atalk_iface *iface = dev->atalk_ptr;
342         return iface ? &iface->address : NULL;
343 }
344 
345 static struct atalk_addr *atalk_find_primary(void)
346 {
347         struct atalk_iface *fiface = NULL;
348         struct atalk_addr *retval;
349         struct atalk_iface *iface;
350 
351         /*
352          * Return a point-to-point interface only if
353          * there is no non-ptp interface available.
354          */
355         read_lock_bh(&atalk_interfaces_lock);
356         for (iface = atalk_interfaces; iface; iface = iface->next) {
357                 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
358                         fiface = iface;
359                 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
360                         retval = &iface->address;
361                         goto out;
362                 }
363         }
364 
365         if (fiface)
366                 retval = &fiface->address;
367         else if (atalk_interfaces)
368                 retval = &atalk_interfaces->address;
369         else
370                 retval = NULL;
371 out:
372         read_unlock_bh(&atalk_interfaces_lock);
373         return retval;
374 }
375 
376 /*
377  * Find a match for 'any network' - ie any of our interfaces with that
378  * node number will do just nicely.
379  */
380 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
381 {
382         struct atalk_iface *iface = dev->atalk_ptr;
383 
384         if (!iface || iface->status & ATIF_PROBE)
385                 goto out_err;
386 
387         if (node != ATADDR_BCAST &&
388             iface->address.s_node != node &&
389             node != ATADDR_ANYNODE)
390                 goto out_err;
391 out:
392         return iface;
393 out_err:
394         iface = NULL;
395         goto out;
396 }
397 
398 /* Find a match for a specific network:node pair */
399 static struct atalk_iface *atalk_find_interface(__be16 net, int node)
400 {
401         struct atalk_iface *iface;
402 
403         read_lock_bh(&atalk_interfaces_lock);
404         for (iface = atalk_interfaces; iface; iface = iface->next) {
405                 if ((node == ATADDR_BCAST ||
406                      node == ATADDR_ANYNODE ||
407                      iface->address.s_node == node) &&
408                     iface->address.s_net == net &&
409                     !(iface->status & ATIF_PROBE))
410                         break;
411 
412                 /* XXXX.0 -- net.0 returns the iface associated with net */
413                 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
414                     ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
415                     ntohs(net) <= ntohs(iface->nets.nr_lastnet))
416                         break;
417         }
418         read_unlock_bh(&atalk_interfaces_lock);
419         return iface;
420 }
421 
422 
423 /*
424  * Find a route for an AppleTalk packet. This ought to get cached in
425  * the socket (later on...). We know about host routes and the fact
426  * that a route must be direct to broadcast.
427  */
428 static struct atalk_route *atrtr_find(struct atalk_addr *target)
429 {
430         /*
431          * we must search through all routes unless we find a
432          * host route, because some host routes might overlap
433          * network routes
434          */
435         struct atalk_route *net_route = NULL;
436         struct atalk_route *r;
437 
438         read_lock_bh(&atalk_routes_lock);
439         for (r = atalk_routes; r; r = r->next) {
440                 if (!(r->flags & RTF_UP))
441                         continue;
442 
443                 if (r->target.s_net == target->s_net) {
444                         if (r->flags & RTF_HOST) {
445                                 /*
446                                  * if this host route is for the target,
447                                  * the we're done
448                                  */
449                                 if (r->target.s_node == target->s_node)
450                                         goto out;
451                         } else
452                                 /*
453                                  * this route will work if there isn't a
454                                  * direct host route, so cache it
455                                  */
456                                 net_route = r;
457                 }
458         }
459 
460         /*
461          * if we found a network route but not a direct host
462          * route, then return it
463          */
464         if (net_route)
465                 r = net_route;
466         else if (atrtr_default.dev)
467                 r = &atrtr_default;
468         else /* No route can be found */
469                 r = NULL;
470 out:
471         read_unlock_bh(&atalk_routes_lock);
472         return r;
473 }
474 
475 
476 /*
477  * Given an AppleTalk network, find the device to use. This can be
478  * a simple lookup.
479  */
480 struct net_device *atrtr_get_dev(struct atalk_addr *sa)
481 {
482         struct atalk_route *atr = atrtr_find(sa);
483         return atr ? atr->dev : NULL;
484 }
485 
486 /* Set up a default router */
487 static void atrtr_set_default(struct net_device *dev)
488 {
489         atrtr_default.dev            = dev;
490         atrtr_default.flags          = RTF_UP;
491         atrtr_default.gateway.s_net  = htons(0);
492         atrtr_default.gateway.s_node = 0;
493 }
494 
495 /*
496  * Add a router. Basically make sure it looks valid and stuff the
497  * entry in the list. While it uses netranges we always set them to one
498  * entry to work like netatalk.
499  */
500 static int atrtr_create(struct rtentry *r, struct net_device *devhint)
501 {
502         struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
503         struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
504         struct atalk_route *rt;
505         struct atalk_iface *iface, *riface;
506         int retval = -EINVAL;
507 
508         /*
509          * Fixme: Raise/Lower a routing change semaphore for these
510          * operations.
511          */
512 
513         /* Validate the request */
514         if (ta->sat_family != AF_APPLETALK ||
515             (!devhint && ga->sat_family != AF_APPLETALK))
516                 goto out;
517 
518         /* Now walk the routing table and make our decisions */
519         write_lock_bh(&atalk_routes_lock);
520         for (rt = atalk_routes; rt; rt = rt->next) {
521                 if (r->rt_flags != rt->flags)
522                         continue;
523 
524                 if (ta->sat_addr.s_net == rt->target.s_net) {
525                         if (!(rt->flags & RTF_HOST))
526                                 break;
527                         if (ta->sat_addr.s_node == rt->target.s_node)
528                                 break;
529                 }
530         }
531 
532         if (!devhint) {
533                 riface = NULL;
534 
535                 read_lock_bh(&atalk_interfaces_lock);
536                 for (iface = atalk_interfaces; iface; iface = iface->next) {
537                         if (!riface &&
538                             ntohs(ga->sat_addr.s_net) >=
539                                         ntohs(iface->nets.nr_firstnet) &&
540                             ntohs(ga->sat_addr.s_net) <=
541                                         ntohs(iface->nets.nr_lastnet))
542                                 riface = iface;
543 
544                         if (ga->sat_addr.s_net == iface->address.s_net &&
545                             ga->sat_addr.s_node == iface->address.s_node)
546                                 riface = iface;
547                 }
548                 read_unlock_bh(&atalk_interfaces_lock);
549 
550                 retval = -ENETUNREACH;
551                 if (!riface)
552                         goto out_unlock;
553 
554                 devhint = riface->dev;
555         }
556 
557         if (!rt) {
558                 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
559 
560                 retval = -ENOBUFS;
561                 if (!rt)
562                         goto out_unlock;
563 
564                 rt->next = atalk_routes;
565                 atalk_routes = rt;
566         }
567 
568         /* Fill in the routing entry */
569         rt->target  = ta->sat_addr;
570         dev_hold(devhint);
571         rt->dev     = devhint;
572         rt->flags   = r->rt_flags;
573         rt->gateway = ga->sat_addr;
574 
575         retval = 0;
576 out_unlock:
577         write_unlock_bh(&atalk_routes_lock);
578 out:
579         return retval;
580 }
581 
582 /* Delete a route. Find it and discard it */
583 static int atrtr_delete(struct atalk_addr *addr)
584 {
585         struct atalk_route **r = &atalk_routes;
586         int retval = 0;
587         struct atalk_route *tmp;
588 
589         write_lock_bh(&atalk_routes_lock);
590         while ((tmp = *r) != NULL) {
591                 if (tmp->target.s_net == addr->s_net &&
592                     (!(tmp->flags&RTF_GATEWAY) ||
593                      tmp->target.s_node == addr->s_node)) {
594                         *r = tmp->next;
595                         dev_put(tmp->dev);
596                         kfree(tmp);
597                         goto out;
598                 }
599                 r = &tmp->next;
600         }
601         retval = -ENOENT;
602 out:
603         write_unlock_bh(&atalk_routes_lock);
604         return retval;
605 }
606 
607 /*
608  * Called when a device is downed. Just throw away any routes
609  * via it.
610  */
611 static void atrtr_device_down(struct net_device *dev)
612 {
613         struct atalk_route **r = &atalk_routes;
614         struct atalk_route *tmp;
615 
616         write_lock_bh(&atalk_routes_lock);
617         while ((tmp = *r) != NULL) {
618                 if (tmp->dev == dev) {
619                         *r = tmp->next;
620                         dev_put(dev);
621                         kfree(tmp);
622                 } else
623                         r = &tmp->next;
624         }
625         write_unlock_bh(&atalk_routes_lock);
626 
627         if (atrtr_default.dev == dev)
628                 atrtr_set_default(NULL);
629 }
630 
631 /* Actually down the interface */
632 static inline void atalk_dev_down(struct net_device *dev)
633 {
634         atrtr_device_down(dev); /* Remove all routes for the device */
635         aarp_device_down(dev);  /* Remove AARP entries for the device */
636         atif_drop_device(dev);  /* Remove the device */
637 }
638 
639 /*
640  * A device event has occurred. Watch for devices going down and
641  * delete our use of them (iface and route).
642  */
643 static int ddp_device_event(struct notifier_block *this, unsigned long event,
644                             void *ptr)
645 {
646         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
647 
648         if (!net_eq(dev_net(dev), &init_net))
649                 return NOTIFY_DONE;
650 
651         if (event == NETDEV_DOWN)
652                 /* Discard any use of this */
653                 atalk_dev_down(dev);
654 
655         return NOTIFY_DONE;
656 }
657 
658 /* ioctl calls. Shouldn't even need touching */
659 /* Device configuration ioctl calls */
660 static int atif_ioctl(int cmd, void __user *arg)
661 {
662         static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
663         struct ifreq atreq;
664         struct atalk_netrange *nr;
665         struct sockaddr_at *sa;
666         struct net_device *dev;
667         struct atalk_iface *atif;
668         int ct;
669         int limit;
670         struct rtentry rtdef;
671         int add_route;
672 
673         if (copy_from_user(&atreq, arg, sizeof(atreq)))
674                 return -EFAULT;
675 
676         dev = __dev_get_by_name(&init_net, atreq.ifr_name);
677         if (!dev)
678                 return -ENODEV;
679 
680         sa = (struct sockaddr_at *)&atreq.ifr_addr;
681         atif = atalk_find_dev(dev);
682 
683         switch (cmd) {
684         case SIOCSIFADDR:
685                 if (!capable(CAP_NET_ADMIN))
686                         return -EPERM;
687                 if (sa->sat_family != AF_APPLETALK)
688                         return -EINVAL;
689                 if (dev->type != ARPHRD_ETHER &&
690                     dev->type != ARPHRD_LOOPBACK &&
691                     dev->type != ARPHRD_LOCALTLK &&
692                     dev->type != ARPHRD_PPP)
693                         return -EPROTONOSUPPORT;
694 
695                 nr = (struct atalk_netrange *)&sa->sat_zero[0];
696                 add_route = 1;
697 
698                 /*
699                  * if this is a point-to-point iface, and we already
700                  * have an iface for this AppleTalk address, then we
701                  * should not add a route
702                  */
703                 if ((dev->flags & IFF_POINTOPOINT) &&
704                     atalk_find_interface(sa->sat_addr.s_net,
705                                          sa->sat_addr.s_node)) {
706                         printk(KERN_DEBUG "AppleTalk: point-to-point "
707                                "interface added with "
708                                "existing address\n");
709                         add_route = 0;
710                 }
711 
712                 /*
713                  * Phase 1 is fine on LocalTalk but we don't do
714                  * EtherTalk phase 1. Anyone wanting to add it go ahead.
715                  */
716                 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
717                         return -EPROTONOSUPPORT;
718                 if (sa->sat_addr.s_node == ATADDR_BCAST ||
719                     sa->sat_addr.s_node == 254)
720                         return -EINVAL;
721                 if (atif) {
722                         /* Already setting address */
723                         if (atif->status & ATIF_PROBE)
724                                 return -EBUSY;
725 
726                         atif->address.s_net  = sa->sat_addr.s_net;
727                         atif->address.s_node = sa->sat_addr.s_node;
728                         atrtr_device_down(dev); /* Flush old routes */
729                 } else {
730                         atif = atif_add_device(dev, &sa->sat_addr);
731                         if (!atif)
732                                 return -ENOMEM;
733                 }
734                 atif->nets = *nr;
735 
736                 /*
737                  * Check if the chosen address is used. If so we
738                  * error and atalkd will try another.
739                  */
740 
741                 if (!(dev->flags & IFF_LOOPBACK) &&
742                     !(dev->flags & IFF_POINTOPOINT) &&
743                     atif_probe_device(atif) < 0) {
744                         atif_drop_device(dev);
745                         return -EADDRINUSE;
746                 }
747 
748                 /* Hey it worked - add the direct routes */
749                 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
750                 sa->sat_family = AF_APPLETALK;
751                 sa->sat_addr.s_net  = atif->address.s_net;
752                 sa->sat_addr.s_node = atif->address.s_node;
753                 sa = (struct sockaddr_at *)&rtdef.rt_dst;
754                 rtdef.rt_flags = RTF_UP;
755                 sa->sat_family = AF_APPLETALK;
756                 sa->sat_addr.s_node = ATADDR_ANYNODE;
757                 if (dev->flags & IFF_LOOPBACK ||
758                     dev->flags & IFF_POINTOPOINT)
759                         rtdef.rt_flags |= RTF_HOST;
760 
761                 /* Routerless initial state */
762                 if (nr->nr_firstnet == htons(0) &&
763                     nr->nr_lastnet == htons(0xFFFE)) {
764                         sa->sat_addr.s_net = atif->address.s_net;
765                         atrtr_create(&rtdef, dev);
766                         atrtr_set_default(dev);
767                 } else {
768                         limit = ntohs(nr->nr_lastnet);
769                         if (limit - ntohs(nr->nr_firstnet) > 4096) {
770                                 printk(KERN_WARNING "Too many routes/"
771                                        "iface.\n");
772                                 return -EINVAL;
773                         }
774                         if (add_route)
775                                 for (ct = ntohs(nr->nr_firstnet);
776                                      ct <= limit; ct++) {
777                                         sa->sat_addr.s_net = htons(ct);
778                                         atrtr_create(&rtdef, dev);
779                                 }
780                 }
781                 dev_mc_add_global(dev, aarp_mcast);
782                 return 0;
783 
784         case SIOCGIFADDR:
785                 if (!atif)
786                         return -EADDRNOTAVAIL;
787 
788                 sa->sat_family = AF_APPLETALK;
789                 sa->sat_addr = atif->address;
790                 break;
791 
792         case SIOCGIFBRDADDR:
793                 if (!atif)
794                         return -EADDRNOTAVAIL;
795 
796                 sa->sat_family = AF_APPLETALK;
797                 sa->sat_addr.s_net = atif->address.s_net;
798                 sa->sat_addr.s_node = ATADDR_BCAST;
799                 break;
800 
801         case SIOCATALKDIFADDR:
802         case SIOCDIFADDR:
803                 if (!capable(CAP_NET_ADMIN))
804                         return -EPERM;
805                 if (sa->sat_family != AF_APPLETALK)
806                         return -EINVAL;
807                 atalk_dev_down(dev);
808                 break;
809 
810         case SIOCSARP:
811                 if (!capable(CAP_NET_ADMIN))
812                         return -EPERM;
813                 if (sa->sat_family != AF_APPLETALK)
814                         return -EINVAL;
815                 /*
816                  * for now, we only support proxy AARP on ELAP;
817                  * we should be able to do it for LocalTalk, too.
818                  */
819                 if (dev->type != ARPHRD_ETHER)
820                         return -EPROTONOSUPPORT;
821 
822                 /*
823                  * atif points to the current interface on this network;
824                  * we aren't concerned about its current status (at
825                  * least for now), but it has all the settings about
826                  * the network we're going to probe. Consequently, it
827                  * must exist.
828                  */
829                 if (!atif)
830                         return -EADDRNOTAVAIL;
831 
832                 nr = (struct atalk_netrange *)&(atif->nets);
833                 /*
834                  * Phase 1 is fine on Localtalk but we don't do
835                  * Ethertalk phase 1. Anyone wanting to add it go ahead.
836                  */
837                 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
838                         return -EPROTONOSUPPORT;
839 
840                 if (sa->sat_addr.s_node == ATADDR_BCAST ||
841                     sa->sat_addr.s_node == 254)
842                         return -EINVAL;
843 
844                 /*
845                  * Check if the chosen address is used. If so we
846                  * error and ATCP will try another.
847                  */
848                 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
849                         return -EADDRINUSE;
850 
851                 /*
852                  * We now have an address on the local network, and
853                  * the AARP code will defend it for us until we take it
854                  * down. We don't set up any routes right now, because
855                  * ATCP will install them manually via SIOCADDRT.
856                  */
857                 break;
858 
859         case SIOCDARP:
860                 if (!capable(CAP_NET_ADMIN))
861                         return -EPERM;
862                 if (sa->sat_family != AF_APPLETALK)
863                         return -EINVAL;
864                 if (!atif)
865                         return -EADDRNOTAVAIL;
866 
867                 /* give to aarp module to remove proxy entry */
868                 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
869                 return 0;
870         }
871 
872         return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
873 }
874 
875 /* Routing ioctl() calls */
876 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
877 {
878         struct rtentry rt;
879 
880         if (copy_from_user(&rt, arg, sizeof(rt)))
881                 return -EFAULT;
882 
883         switch (cmd) {
884         case SIOCDELRT:
885                 if (rt.rt_dst.sa_family != AF_APPLETALK)
886                         return -EINVAL;
887                 return atrtr_delete(&((struct sockaddr_at *)
888                                       &rt.rt_dst)->sat_addr);
889 
890         case SIOCADDRT: {
891                 struct net_device *dev = NULL;
892                 if (rt.rt_dev) {
893                         char name[IFNAMSIZ];
894                         if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
895                                 return -EFAULT;
896                         name[IFNAMSIZ-1] = '\0';
897                         dev = __dev_get_by_name(&init_net, name);
898                         if (!dev)
899                                 return -ENODEV;
900                 }
901                 return atrtr_create(&rt, dev);
902         }
903         }
904         return -EINVAL;
905 }
906 
907 /**************************************************************************\
908 *                                                                          *
909 * Handling for system calls applied via the various interfaces to an       *
910 * AppleTalk socket object.                                                 *
911 *                                                                          *
912 \**************************************************************************/
913 
914 /*
915  * Checksum: This is 'optional'. It's quite likely also a good
916  * candidate for assembler hackery 8)
917  */
918 static unsigned long atalk_sum_partial(const unsigned char *data,
919                                        int len, unsigned long sum)
920 {
921         /* This ought to be unwrapped neatly. I'll trust gcc for now */
922         while (len--) {
923                 sum += *data++;
924                 sum = rol16(sum, 1);
925         }
926         return sum;
927 }
928 
929 /*  Checksum skb data --  similar to skb_checksum  */
930 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
931                                    int len, unsigned long sum)
932 {
933         int start = skb_headlen(skb);
934         struct sk_buff *frag_iter;
935         int i, copy;
936 
937         /* checksum stuff in header space */
938         if ((copy = start - offset) > 0) {
939                 if (copy > len)
940                         copy = len;
941                 sum = atalk_sum_partial(skb->data + offset, copy, sum);
942                 if ((len -= copy) == 0)
943                         return sum;
944 
945                 offset += copy;
946         }
947 
948         /* checksum stuff in frags */
949         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
950                 int end;
951                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
952                 WARN_ON(start > offset + len);
953 
954                 end = start + skb_frag_size(frag);
955                 if ((copy = end - offset) > 0) {
956                         u8 *vaddr;
957 
958                         if (copy > len)
959                                 copy = len;
960                         vaddr = kmap_atomic(skb_frag_page(frag));
961                         sum = atalk_sum_partial(vaddr + frag->page_offset +
962                                                   offset - start, copy, sum);
963                         kunmap_atomic(vaddr);
964 
965                         if (!(len -= copy))
966                                 return sum;
967                         offset += copy;
968                 }
969                 start = end;
970         }
971 
972         skb_walk_frags(skb, frag_iter) {
973                 int end;
974 
975                 WARN_ON(start > offset + len);
976 
977                 end = start + frag_iter->len;
978                 if ((copy = end - offset) > 0) {
979                         if (copy > len)
980                                 copy = len;
981                         sum = atalk_sum_skb(frag_iter, offset - start,
982                                             copy, sum);
983                         if ((len -= copy) == 0)
984                                 return sum;
985                         offset += copy;
986                 }
987                 start = end;
988         }
989 
990         BUG_ON(len > 0);
991 
992         return sum;
993 }
994 
995 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
996 {
997         unsigned long sum;
998 
999         /* skip header 4 bytes */
1000         sum = atalk_sum_skb(skb, 4, len-4, 0);
1001 
1002         /* Use 0xFFFF for 0. 0 itself means none */
1003         return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1004 }
1005 
1006 static struct proto ddp_proto = {
1007         .name     = "DDP",
1008         .owner    = THIS_MODULE,
1009         .obj_size = sizeof(struct atalk_sock),
1010 };
1011 
1012 /*
1013  * Create a socket. Initialise the socket, blank the addresses
1014  * set the state.
1015  */
1016 static int atalk_create(struct net *net, struct socket *sock, int protocol,
1017                         int kern)
1018 {
1019         struct sock *sk;
1020         int rc = -ESOCKTNOSUPPORT;
1021 
1022         if (!net_eq(net, &init_net))
1023                 return -EAFNOSUPPORT;
1024 
1025         /*
1026          * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1027          * and gives you the full ELAP frame. Should be handy for CAP 8)
1028          */
1029         if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1030                 goto out;
1031         rc = -ENOMEM;
1032         sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, kern);
1033         if (!sk)
1034                 goto out;
1035         rc = 0;
1036         sock->ops = &atalk_dgram_ops;
1037         sock_init_data(sock, sk);
1038 
1039         /* Checksums on by default */
1040         sock_set_flag(sk, SOCK_ZAPPED);
1041 out:
1042         return rc;
1043 }
1044 
1045 /* Free a socket. No work needed */
1046 static int atalk_release(struct socket *sock)
1047 {
1048         struct sock *sk = sock->sk;
1049 
1050         if (sk) {
1051                 sock_hold(sk);
1052                 lock_sock(sk);
1053 
1054                 sock_orphan(sk);
1055                 sock->sk = NULL;
1056                 atalk_destroy_socket(sk);
1057 
1058                 release_sock(sk);
1059                 sock_put(sk);
1060         }
1061         return 0;
1062 }
1063 
1064 /**
1065  * atalk_pick_and_bind_port - Pick a source port when one is not given
1066  * @sk: socket to insert into the tables
1067  * @sat: address to search for
1068  *
1069  * Pick a source port when one is not given. If we can find a suitable free
1070  * one, we insert the socket into the tables using it.
1071  *
1072  * This whole operation must be atomic.
1073  */
1074 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1075 {
1076         int retval;
1077 
1078         write_lock_bh(&atalk_sockets_lock);
1079 
1080         for (sat->sat_port = ATPORT_RESERVED;
1081              sat->sat_port < ATPORT_LAST;
1082              sat->sat_port++) {
1083                 struct sock *s;
1084 
1085                 sk_for_each(s, &atalk_sockets) {
1086                         struct atalk_sock *at = at_sk(s);
1087 
1088                         if (at->src_net == sat->sat_addr.s_net &&
1089                             at->src_node == sat->sat_addr.s_node &&
1090                             at->src_port == sat->sat_port)
1091                                 goto try_next_port;
1092                 }
1093 
1094                 /* Wheee, it's free, assign and insert. */
1095                 __atalk_insert_socket(sk);
1096                 at_sk(sk)->src_port = sat->sat_port;
1097                 retval = 0;
1098                 goto out;
1099 
1100 try_next_port:;
1101         }
1102 
1103         retval = -EBUSY;
1104 out:
1105         write_unlock_bh(&atalk_sockets_lock);
1106         return retval;
1107 }
1108 
1109 static int atalk_autobind(struct sock *sk)
1110 {
1111         struct atalk_sock *at = at_sk(sk);
1112         struct sockaddr_at sat;
1113         struct atalk_addr *ap = atalk_find_primary();
1114         int n = -EADDRNOTAVAIL;
1115 
1116         if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1117                 goto out;
1118 
1119         at->src_net  = sat.sat_addr.s_net  = ap->s_net;
1120         at->src_node = sat.sat_addr.s_node = ap->s_node;
1121 
1122         n = atalk_pick_and_bind_port(sk, &sat);
1123         if (!n)
1124                 sock_reset_flag(sk, SOCK_ZAPPED);
1125 out:
1126         return n;
1127 }
1128 
1129 /* Set the address 'our end' of the connection */
1130 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1131 {
1132         struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1133         struct sock *sk = sock->sk;
1134         struct atalk_sock *at = at_sk(sk);
1135         int err;
1136 
1137         if (!sock_flag(sk, SOCK_ZAPPED) ||
1138             addr_len != sizeof(struct sockaddr_at))
1139                 return -EINVAL;
1140 
1141         if (addr->sat_family != AF_APPLETALK)
1142                 return -EAFNOSUPPORT;
1143 
1144         lock_sock(sk);
1145         if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1146                 struct atalk_addr *ap = atalk_find_primary();
1147 
1148                 err = -EADDRNOTAVAIL;
1149                 if (!ap)
1150                         goto out;
1151 
1152                 at->src_net  = addr->sat_addr.s_net = ap->s_net;
1153                 at->src_node = addr->sat_addr.s_node = ap->s_node;
1154         } else {
1155                 err = -EADDRNOTAVAIL;
1156                 if (!atalk_find_interface(addr->sat_addr.s_net,
1157                                           addr->sat_addr.s_node))
1158                         goto out;
1159 
1160                 at->src_net  = addr->sat_addr.s_net;
1161                 at->src_node = addr->sat_addr.s_node;
1162         }
1163 
1164         if (addr->sat_port == ATADDR_ANYPORT) {
1165                 err = atalk_pick_and_bind_port(sk, addr);
1166 
1167                 if (err < 0)
1168                         goto out;
1169         } else {
1170                 at->src_port = addr->sat_port;
1171 
1172                 err = -EADDRINUSE;
1173                 if (atalk_find_or_insert_socket(sk, addr))
1174                         goto out;
1175         }
1176 
1177         sock_reset_flag(sk, SOCK_ZAPPED);
1178         err = 0;
1179 out:
1180         release_sock(sk);
1181         return err;
1182 }
1183 
1184 /* Set the address we talk to */
1185 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1186                          int addr_len, int flags)
1187 {
1188         struct sock *sk = sock->sk;
1189         struct atalk_sock *at = at_sk(sk);
1190         struct sockaddr_at *addr;
1191         int err;
1192 
1193         sk->sk_state   = TCP_CLOSE;
1194         sock->state = SS_UNCONNECTED;
1195 
1196         if (addr_len != sizeof(*addr))
1197                 return -EINVAL;
1198 
1199         addr = (struct sockaddr_at *)uaddr;
1200 
1201         if (addr->sat_family != AF_APPLETALK)
1202                 return -EAFNOSUPPORT;
1203 
1204         if (addr->sat_addr.s_node == ATADDR_BCAST &&
1205             !sock_flag(sk, SOCK_BROADCAST)) {
1206 #if 1
1207                 pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n",
1208                         current->comm);
1209 #else
1210                 return -EACCES;
1211 #endif
1212         }
1213 
1214         lock_sock(sk);
1215         err = -EBUSY;
1216         if (sock_flag(sk, SOCK_ZAPPED))
1217                 if (atalk_autobind(sk) < 0)
1218                         goto out;
1219 
1220         err = -ENETUNREACH;
1221         if (!atrtr_get_dev(&addr->sat_addr))
1222                 goto out;
1223 
1224         at->dest_port = addr->sat_port;
1225         at->dest_net  = addr->sat_addr.s_net;
1226         at->dest_node = addr->sat_addr.s_node;
1227 
1228         sock->state  = SS_CONNECTED;
1229         sk->sk_state = TCP_ESTABLISHED;
1230         err = 0;
1231 out:
1232         release_sock(sk);
1233         return err;
1234 }
1235 
1236 /*
1237  * Find the name of an AppleTalk socket. Just copy the right
1238  * fields into the sockaddr.
1239  */
1240 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1241                          int *uaddr_len, int peer)
1242 {
1243         struct sockaddr_at sat;
1244         struct sock *sk = sock->sk;
1245         struct atalk_sock *at = at_sk(sk);
1246         int err;
1247 
1248         lock_sock(sk);
1249         err = -ENOBUFS;
1250         if (sock_flag(sk, SOCK_ZAPPED))
1251                 if (atalk_autobind(sk) < 0)
1252                         goto out;
1253 
1254         *uaddr_len = sizeof(struct sockaddr_at);
1255         memset(&sat, 0, sizeof(sat));
1256 
1257         if (peer) {
1258                 err = -ENOTCONN;
1259                 if (sk->sk_state != TCP_ESTABLISHED)
1260                         goto out;
1261 
1262                 sat.sat_addr.s_net  = at->dest_net;
1263                 sat.sat_addr.s_node = at->dest_node;
1264                 sat.sat_port        = at->dest_port;
1265         } else {
1266                 sat.sat_addr.s_net  = at->src_net;
1267                 sat.sat_addr.s_node = at->src_node;
1268                 sat.sat_port        = at->src_port;
1269         }
1270 
1271         err = 0;
1272         sat.sat_family = AF_APPLETALK;
1273         memcpy(uaddr, &sat, sizeof(sat));
1274 
1275 out:
1276         release_sock(sk);
1277         return err;
1278 }
1279 
1280 #if IS_ENABLED(CONFIG_IPDDP)
1281 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1282 {
1283         return skb->data[12] == 22;
1284 }
1285 
1286 static int handle_ip_over_ddp(struct sk_buff *skb)
1287 {
1288         struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
1289         struct net_device_stats *stats;
1290 
1291         /* This needs to be able to handle ipddp"N" devices */
1292         if (!dev) {
1293                 kfree_skb(skb);
1294                 return NET_RX_DROP;
1295         }
1296 
1297         skb->protocol = htons(ETH_P_IP);
1298         skb_pull(skb, 13);
1299         skb->dev   = dev;
1300         skb_reset_transport_header(skb);
1301 
1302         stats = netdev_priv(dev);
1303         stats->rx_packets++;
1304         stats->rx_bytes += skb->len + 13;
1305         return netif_rx(skb);  /* Send the SKB up to a higher place. */
1306 }
1307 #else
1308 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1309 #define is_ip_over_ddp(skb) 0
1310 #define handle_ip_over_ddp(skb) 0
1311 #endif
1312 
1313 static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1314                               struct ddpehdr *ddp, __u16 len_hops, int origlen)
1315 {
1316         struct atalk_route *rt;
1317         struct atalk_addr ta;
1318 
1319         /*
1320          * Don't route multicast, etc., packets, or packets sent to "this
1321          * network"
1322          */
1323         if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1324                 /*
1325                  * FIXME:
1326                  *
1327                  * Can it ever happen that a packet is from a PPP iface and
1328                  * needs to be broadcast onto the default network?
1329                  */
1330                 if (dev->type == ARPHRD_PPP)
1331                         printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1332                                           "packet received from PPP iface\n");
1333                 goto free_it;
1334         }
1335 
1336         ta.s_net  = ddp->deh_dnet;
1337         ta.s_node = ddp->deh_dnode;
1338 
1339         /* Route the packet */
1340         rt = atrtr_find(&ta);
1341         /* increment hops count */
1342         len_hops += 1 << 10;
1343         if (!rt || !(len_hops & (15 << 10)))
1344                 goto free_it;
1345 
1346         /* FIXME: use skb->cb to be able to use shared skbs */
1347 
1348         /*
1349          * Route goes through another gateway, so set the target to the
1350          * gateway instead.
1351          */
1352 
1353         if (rt->flags & RTF_GATEWAY) {
1354                 ta.s_net  = rt->gateway.s_net;
1355                 ta.s_node = rt->gateway.s_node;
1356         }
1357 
1358         /* Fix up skb->len field */
1359         skb_trim(skb, min_t(unsigned int, origlen,
1360                             (rt->dev->hard_header_len +
1361                              ddp_dl->header_length + (len_hops & 1023))));
1362 
1363         /* FIXME: use skb->cb to be able to use shared skbs */
1364         ddp->deh_len_hops = htons(len_hops);
1365 
1366         /*
1367          * Send the buffer onwards
1368          *
1369          * Now we must always be careful. If it's come from LocalTalk to
1370          * EtherTalk it might not fit
1371          *
1372          * Order matters here: If a packet has to be copied to make a new
1373          * headroom (rare hopefully) then it won't need unsharing.
1374          *
1375          * Note. ddp-> becomes invalid at the realloc.
1376          */
1377         if (skb_headroom(skb) < 22) {
1378                 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1379                 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1380                 kfree_skb(skb);
1381                 skb = nskb;
1382         } else
1383                 skb = skb_unshare(skb, GFP_ATOMIC);
1384 
1385         /*
1386          * If the buffer didn't vanish into the lack of space bitbucket we can
1387          * send it.
1388          */
1389         if (skb == NULL)
1390                 goto drop;
1391 
1392         if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
1393                 return NET_RX_DROP;
1394         return NET_RX_SUCCESS;
1395 free_it:
1396         kfree_skb(skb);
1397 drop:
1398         return NET_RX_DROP;
1399 }
1400 
1401 /**
1402  *      atalk_rcv - Receive a packet (in skb) from device dev
1403  *      @skb - packet received
1404  *      @dev - network device where the packet comes from
1405  *      @pt - packet type
1406  *
1407  *      Receive a packet (in skb) from device dev. This has come from the SNAP
1408  *      decoder, and on entry skb->transport_header is the DDP header, skb->len
1409  *      is the DDP header, skb->len is the DDP length. The physical headers
1410  *      have been extracted. PPP should probably pass frames marked as for this
1411  *      layer.  [ie ARPHRD_ETHERTALK]
1412  */
1413 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1414                      struct packet_type *pt, struct net_device *orig_dev)
1415 {
1416         struct ddpehdr *ddp;
1417         struct sock *sock;
1418         struct atalk_iface *atif;
1419         struct sockaddr_at tosat;
1420         int origlen;
1421         __u16 len_hops;
1422 
1423         if (!net_eq(dev_net(dev), &init_net))
1424                 goto drop;
1425 
1426         /* Don't mangle buffer if shared */
1427         if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1428                 goto out;
1429 
1430         /* Size check and make sure header is contiguous */
1431         if (!pskb_may_pull(skb, sizeof(*ddp)))
1432                 goto drop;
1433 
1434         ddp = ddp_hdr(skb);
1435 
1436         len_hops = ntohs(ddp->deh_len_hops);
1437 
1438         /* Trim buffer in case of stray trailing data */
1439         origlen = skb->len;
1440         skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1441 
1442         /*
1443          * Size check to see if ddp->deh_len was crap
1444          * (Otherwise we'll detonate most spectacularly
1445          * in the middle of atalk_checksum() or recvmsg()).
1446          */
1447         if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1448                 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1449                          "skb->len=%u)\n", len_hops & 1023, skb->len);
1450                 goto drop;
1451         }
1452 
1453         /*
1454          * Any checksums. Note we don't do htons() on this == is assumed to be
1455          * valid for net byte orders all over the networking code...
1456          */
1457         if (ddp->deh_sum &&
1458             atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1459                 /* Not a valid AppleTalk frame - dustbin time */
1460                 goto drop;
1461 
1462         /* Check the packet is aimed at us */
1463         if (!ddp->deh_dnet)     /* Net 0 is 'this network' */
1464                 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1465         else
1466                 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1467 
1468         if (!atif) {
1469                 /* Not ours, so we route the packet via the correct
1470                  * AppleTalk iface
1471                  */
1472                 return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1473         }
1474 
1475         /* if IP over DDP is not selected this code will be optimized out */
1476         if (is_ip_over_ddp(skb))
1477                 return handle_ip_over_ddp(skb);
1478         /*
1479          * Which socket - atalk_search_socket() looks for a *full match*
1480          * of the <net, node, port> tuple.
1481          */
1482         tosat.sat_addr.s_net  = ddp->deh_dnet;
1483         tosat.sat_addr.s_node = ddp->deh_dnode;
1484         tosat.sat_port        = ddp->deh_dport;
1485 
1486         sock = atalk_search_socket(&tosat, atif);
1487         if (!sock) /* But not one of our sockets */
1488                 goto drop;
1489 
1490         /* Queue packet (standard) */
1491         if (sock_queue_rcv_skb(sock, skb) < 0)
1492                 goto drop;
1493 
1494         return NET_RX_SUCCESS;
1495 
1496 drop:
1497         kfree_skb(skb);
1498 out:
1499         return NET_RX_DROP;
1500 
1501 }
1502 
1503 /*
1504  * Receive a LocalTalk frame. We make some demands on the caller here.
1505  * Caller must provide enough headroom on the packet to pull the short
1506  * header and append a long one.
1507  */
1508 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1509                      struct packet_type *pt, struct net_device *orig_dev)
1510 {
1511         if (!net_eq(dev_net(dev), &init_net))
1512                 goto freeit;
1513 
1514         /* Expand any short form frames */
1515         if (skb_mac_header(skb)[2] == 1) {
1516                 struct ddpehdr *ddp;
1517                 /* Find our address */
1518                 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1519 
1520                 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1521                         goto freeit;
1522 
1523                 /* Don't mangle buffer if shared */
1524                 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1525                         return 0;
1526 
1527                 /*
1528                  * The push leaves us with a ddephdr not an shdr, and
1529                  * handily the port bytes in the right place preset.
1530                  */
1531                 ddp = skb_push(skb, sizeof(*ddp) - 4);
1532 
1533                 /* Now fill in the long header */
1534 
1535                 /*
1536                  * These two first. The mac overlays the new source/dest
1537                  * network information so we MUST copy these before
1538                  * we write the network numbers !
1539                  */
1540 
1541                 ddp->deh_dnode = skb_mac_header(skb)[0];     /* From physical header */
1542                 ddp->deh_snode = skb_mac_header(skb)[1];     /* From physical header */
1543 
1544                 ddp->deh_dnet  = ap->s_net;     /* Network number */
1545                 ddp->deh_snet  = ap->s_net;
1546                 ddp->deh_sum   = 0;             /* No checksum */
1547                 /*
1548                  * Not sure about this bit...
1549                  */
1550                 /* Non routable, so force a drop if we slip up later */
1551                 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1552         }
1553         skb_reset_transport_header(skb);
1554 
1555         return atalk_rcv(skb, dev, pt, orig_dev);
1556 freeit:
1557         kfree_skb(skb);
1558         return 0;
1559 }
1560 
1561 static int atalk_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1562 {
1563         struct sock *sk = sock->sk;
1564         struct atalk_sock *at = at_sk(sk);
1565         DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name);
1566         int flags = msg->msg_flags;
1567         int loopback = 0;
1568         struct sockaddr_at local_satalk, gsat;
1569         struct sk_buff *skb;
1570         struct net_device *dev;
1571         struct ddpehdr *ddp;
1572         int size;
1573         struct atalk_route *rt;
1574         int err;
1575 
1576         if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1577                 return -EINVAL;
1578 
1579         if (len > DDP_MAXSZ)
1580                 return -EMSGSIZE;
1581 
1582         lock_sock(sk);
1583         if (usat) {
1584                 err = -EBUSY;
1585                 if (sock_flag(sk, SOCK_ZAPPED))
1586                         if (atalk_autobind(sk) < 0)
1587                                 goto out;
1588 
1589                 err = -EINVAL;
1590                 if (msg->msg_namelen < sizeof(*usat) ||
1591                     usat->sat_family != AF_APPLETALK)
1592                         goto out;
1593 
1594                 err = -EPERM;
1595                 /* netatalk didn't implement this check */
1596                 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1597                     !sock_flag(sk, SOCK_BROADCAST)) {
1598                         goto out;
1599                 }
1600         } else {
1601                 err = -ENOTCONN;
1602                 if (sk->sk_state != TCP_ESTABLISHED)
1603                         goto out;
1604                 usat = &local_satalk;
1605                 usat->sat_family      = AF_APPLETALK;
1606                 usat->sat_port        = at->dest_port;
1607                 usat->sat_addr.s_node = at->dest_node;
1608                 usat->sat_addr.s_net  = at->dest_net;
1609         }
1610 
1611         /* Build a packet */
1612         SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1613 
1614         /* For headers */
1615         size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1616 
1617         if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1618                 rt = atrtr_find(&usat->sat_addr);
1619         } else {
1620                 struct atalk_addr at_hint;
1621 
1622                 at_hint.s_node = 0;
1623                 at_hint.s_net  = at->src_net;
1624 
1625                 rt = atrtr_find(&at_hint);
1626         }
1627         err = -ENETUNREACH;
1628         if (!rt)
1629                 goto out;
1630 
1631         dev = rt->dev;
1632 
1633         SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1634                         sk, size, dev->name);
1635 
1636         size += dev->hard_header_len;
1637         release_sock(sk);
1638         skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1639         lock_sock(sk);
1640         if (!skb)
1641                 goto out;
1642 
1643         skb_reserve(skb, ddp_dl->header_length);
1644         skb_reserve(skb, dev->hard_header_len);
1645         skb->dev = dev;
1646 
1647         SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1648 
1649         ddp = skb_put(skb, sizeof(struct ddpehdr));
1650         ddp->deh_len_hops  = htons(len + sizeof(*ddp));
1651         ddp->deh_dnet  = usat->sat_addr.s_net;
1652         ddp->deh_snet  = at->src_net;
1653         ddp->deh_dnode = usat->sat_addr.s_node;
1654         ddp->deh_snode = at->src_node;
1655         ddp->deh_dport = usat->sat_port;
1656         ddp->deh_sport = at->src_port;
1657 
1658         SOCK_DEBUG(sk, "SK %p: Copy user data (%zd bytes).\n", sk, len);
1659 
1660         err = memcpy_from_msg(skb_put(skb, len), msg, len);
1661         if (err) {
1662                 kfree_skb(skb);
1663                 err = -EFAULT;
1664                 goto out;
1665         }
1666 
1667         if (sk->sk_no_check_tx)
1668                 ddp->deh_sum = 0;
1669         else
1670                 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1671 
1672         /*
1673          * Loopback broadcast packets to non gateway targets (ie routes
1674          * to group we are in)
1675          */
1676         if (ddp->deh_dnode == ATADDR_BCAST &&
1677             !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1678                 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1679 
1680                 if (skb2) {
1681                         loopback = 1;
1682                         SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1683                         /*
1684                          * If it fails it is queued/sent above in the aarp queue
1685                          */
1686                         aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
1687                 }
1688         }
1689 
1690         if (dev->flags & IFF_LOOPBACK || loopback) {
1691                 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1692                 /* loop back */
1693                 skb_orphan(skb);
1694                 if (ddp->deh_dnode == ATADDR_BCAST) {
1695                         struct atalk_addr at_lo;
1696 
1697                         at_lo.s_node = 0;
1698                         at_lo.s_net  = 0;
1699 
1700                         rt = atrtr_find(&at_lo);
1701                         if (!rt) {
1702                                 kfree_skb(skb);
1703                                 err = -ENETUNREACH;
1704                                 goto out;
1705                         }
1706                         dev = rt->dev;
1707                         skb->dev = dev;
1708                 }
1709                 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1710         } else {
1711                 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1712                 if (rt->flags & RTF_GATEWAY) {
1713                     gsat.sat_addr = rt->gateway;
1714                     usat = &gsat;
1715                 }
1716 
1717                 /*
1718                  * If it fails it is queued/sent above in the aarp queue
1719                  */
1720                 aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
1721         }
1722         SOCK_DEBUG(sk, "SK %p: Done write (%zd).\n", sk, len);
1723 
1724 out:
1725         release_sock(sk);
1726         return err ? : len;
1727 }
1728 
1729 static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1730                          int flags)
1731 {
1732         struct sock *sk = sock->sk;
1733         struct ddpehdr *ddp;
1734         int copied = 0;
1735         int offset = 0;
1736         int err = 0;
1737         struct sk_buff *skb;
1738 
1739         skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1740                                                 flags & MSG_DONTWAIT, &err);
1741         lock_sock(sk);
1742 
1743         if (!skb)
1744                 goto out;
1745 
1746         /* FIXME: use skb->cb to be able to use shared skbs */
1747         ddp = ddp_hdr(skb);
1748         copied = ntohs(ddp->deh_len_hops) & 1023;
1749 
1750         if (sk->sk_type != SOCK_RAW) {
1751                 offset = sizeof(*ddp);
1752                 copied -= offset;
1753         }
1754 
1755         if (copied > size) {
1756                 copied = size;
1757                 msg->msg_flags |= MSG_TRUNC;
1758         }
1759         err = skb_copy_datagram_msg(skb, offset, msg, copied);
1760 
1761         if (!err && msg->msg_name) {
1762                 DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name);
1763                 sat->sat_family      = AF_APPLETALK;
1764                 sat->sat_port        = ddp->deh_sport;
1765                 sat->sat_addr.s_node = ddp->deh_snode;
1766                 sat->sat_addr.s_net  = ddp->deh_snet;
1767                 msg->msg_namelen     = sizeof(*sat);
1768         }
1769 
1770         skb_free_datagram(sk, skb);     /* Free the datagram. */
1771 
1772 out:
1773         release_sock(sk);
1774         return err ? : copied;
1775 }
1776 
1777 
1778 /*
1779  * AppleTalk ioctl calls.
1780  */
1781 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1782 {
1783         int rc = -ENOIOCTLCMD;
1784         struct sock *sk = sock->sk;
1785         void __user *argp = (void __user *)arg;
1786 
1787         switch (cmd) {
1788         /* Protocol layer */
1789         case TIOCOUTQ: {
1790                 long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1791 
1792                 if (amount < 0)
1793                         amount = 0;
1794                 rc = put_user(amount, (int __user *)argp);
1795                 break;
1796         }
1797         case TIOCINQ: {
1798                 /*
1799                  * These two are safe on a single CPU system as only
1800                  * user tasks fiddle here
1801                  */
1802                 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1803                 long amount = 0;
1804 
1805                 if (skb)
1806                         amount = skb->len - sizeof(struct ddpehdr);
1807                 rc = put_user(amount, (int __user *)argp);
1808                 break;
1809         }
1810         case SIOCGSTAMP:
1811                 rc = sock_get_timestamp(sk, argp);
1812                 break;
1813         case SIOCGSTAMPNS:
1814                 rc = sock_get_timestampns(sk, argp);
1815                 break;
1816         /* Routing */
1817         case SIOCADDRT:
1818         case SIOCDELRT:
1819                 rc = -EPERM;
1820                 if (capable(CAP_NET_ADMIN))
1821                         rc = atrtr_ioctl(cmd, argp);
1822                 break;
1823         /* Interface */
1824         case SIOCGIFADDR:
1825         case SIOCSIFADDR:
1826         case SIOCGIFBRDADDR:
1827         case SIOCATALKDIFADDR:
1828         case SIOCDIFADDR:
1829         case SIOCSARP:          /* proxy AARP */
1830         case SIOCDARP:          /* proxy AARP */
1831                 rtnl_lock();
1832                 rc = atif_ioctl(cmd, argp);
1833                 rtnl_unlock();
1834                 break;
1835         }
1836 
1837         return rc;
1838 }
1839 
1840 
1841 #ifdef CONFIG_COMPAT
1842 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1843 {
1844         /*
1845          * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
1846          * cannot handle it in common code. The data we access if ifreq
1847          * here is compatible, so we can simply call the native
1848          * handler.
1849          */
1850         if (cmd == SIOCATALKDIFADDR)
1851                 return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1852 
1853         return -ENOIOCTLCMD;
1854 }
1855 #endif
1856 
1857 
1858 static const struct net_proto_family atalk_family_ops = {
1859         .family         = PF_APPLETALK,
1860         .create         = atalk_create,
1861         .owner          = THIS_MODULE,
1862 };
1863 
1864 static const struct proto_ops atalk_dgram_ops = {
1865         .family         = PF_APPLETALK,
1866         .owner          = THIS_MODULE,
1867         .release        = atalk_release,
1868         .bind           = atalk_bind,
1869         .connect        = atalk_connect,
1870         .socketpair     = sock_no_socketpair,
1871         .accept         = sock_no_accept,
1872         .getname        = atalk_getname,
1873         .poll           = datagram_poll,
1874         .ioctl          = atalk_ioctl,
1875 #ifdef CONFIG_COMPAT
1876         .compat_ioctl   = atalk_compat_ioctl,
1877 #endif
1878         .listen         = sock_no_listen,
1879         .shutdown       = sock_no_shutdown,
1880         .setsockopt     = sock_no_setsockopt,
1881         .getsockopt     = sock_no_getsockopt,
1882         .sendmsg        = atalk_sendmsg,
1883         .recvmsg        = atalk_recvmsg,
1884         .mmap           = sock_no_mmap,
1885         .sendpage       = sock_no_sendpage,
1886 };
1887 
1888 static struct notifier_block ddp_notifier = {
1889         .notifier_call  = ddp_device_event,
1890 };
1891 
1892 static struct packet_type ltalk_packet_type __read_mostly = {
1893         .type           = cpu_to_be16(ETH_P_LOCALTALK),
1894         .func           = ltalk_rcv,
1895 };
1896 
1897 static struct packet_type ppptalk_packet_type __read_mostly = {
1898         .type           = cpu_to_be16(ETH_P_PPPTALK),
1899         .func           = atalk_rcv,
1900 };
1901 
1902 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1903 
1904 /* Export symbols for use by drivers when AppleTalk is a module */
1905 EXPORT_SYMBOL(atrtr_get_dev);
1906 EXPORT_SYMBOL(atalk_find_dev_addr);
1907 
1908 static const char atalk_err_snap[] __initconst =
1909         KERN_CRIT "Unable to register DDP with SNAP.\n";
1910 
1911 /* Called by proto.c on kernel start up */
1912 static int __init atalk_init(void)
1913 {
1914         int rc = proto_register(&ddp_proto, 0);
1915 
1916         if (rc != 0)
1917                 goto out;
1918 
1919         (void)sock_register(&atalk_family_ops);
1920         ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1921         if (!ddp_dl)
1922                 printk(atalk_err_snap);
1923 
1924         dev_add_pack(&ltalk_packet_type);
1925         dev_add_pack(&ppptalk_packet_type);
1926 
1927         register_netdevice_notifier(&ddp_notifier);
1928         aarp_proto_init();
1929         atalk_proc_init();
1930         atalk_register_sysctl();
1931 out:
1932         return rc;
1933 }
1934 module_init(atalk_init);
1935 
1936 /*
1937  * No explicit module reference count manipulation is needed in the
1938  * protocol. Socket layer sets module reference count for us
1939  * and interfaces reference counting is done
1940  * by the network device layer.
1941  *
1942  * Ergo, before the AppleTalk module can be removed, all AppleTalk
1943  * sockets be closed from user space.
1944  */
1945 static void __exit atalk_exit(void)
1946 {
1947 #ifdef CONFIG_SYSCTL
1948         atalk_unregister_sysctl();
1949 #endif /* CONFIG_SYSCTL */
1950         atalk_proc_exit();
1951         aarp_cleanup_module();  /* General aarp clean-up. */
1952         unregister_netdevice_notifier(&ddp_notifier);
1953         dev_remove_pack(&ltalk_packet_type);
1954         dev_remove_pack(&ppptalk_packet_type);
1955         unregister_snap_client(ddp_dl);
1956         sock_unregister(PF_APPLETALK);
1957         proto_unregister(&ddp_proto);
1958 }
1959 module_exit(atalk_exit);
1960 
1961 MODULE_LICENSE("GPL");
1962 MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
1963 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1964 MODULE_ALIAS_NETPROTO(PF_APPLETALK);
1965 

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