1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * DDP: An implementation of the AppleTalk DDP protocol for
6 * Alan Cox <alan@lxorguk.ukuu.org.uk>
8 * With more than a little assistance from
10 * Wesley Craig <netatalk@umich.edu>
13 * Neil Horman : Added missing device ioctls
14 * Michael Callahan : Made routing work
15 * Wesley Craig : Fix probing to listen to a
17 * Alan Cox : Added send/recvmsg support
18 * Alan Cox : Moved at. to protinfo in
20 * Alan Cox : Added firewall hooks.
21 * Alan Cox : Supports new ARPHRD_LOOPBACK
22 * Christer Weinigel : Routing and /proc fixes.
23 * Bradford Johnson : LocalTalk.
24 * Tom Dyas : Module support.
25 * Alan Cox : Hooks for PPP (based on the
27 * Alan Cox : Posix bits
28 * Alan Cox/Mike Freeman : Possible fix to NBP problems
29 * Bradford Johnson : IP-over-DDP (experimental)
30 * Jay Schulist : Moved IP-over-DDP to its own
31 * driver file. (ipddp.c & ipddp.h)
32 * Jay Schulist : Made work as module with
33 * AppleTalk drivers, cleaned it.
34 * Rob Newberry : Added proxy AARP and AARP
35 * procfs, moved probing to AARP
38 * Michael Zuelsdorff : fix for net.0 packets. don't
39 * allow illegal ether/tokentalk
40 * port assignment. we lose a
41 * valid localtalk port as a
43 * Arnaldo C. de Melo : Cleanup, in preparation for
44 * shared skb support 8)
45 * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c,
49 #include <linux/capability.h>
50 #include <linux/module.h>
51 #include <linux/if_arp.h>
52 #include <linux/termios.h> /* For TIOCOUTQ/INQ */
53 #include <linux/compat.h>
54 #include <linux/slab.h>
55 #include <net/datalink.h>
56 #include <net/psnap.h>
58 #include <net/tcp_states.h>
59 #include <net/route.h>
60 #include <net/compat.h>
61 #include <linux/atalk.h>
62 #include <linux/highmem.h>
64 struct datalink_proto *ddp_dl, *aarp_dl;
65 static const struct proto_ops atalk_dgram_ops;
67 /**************************************************************************\
69 * Handlers for the socket list. *
71 \**************************************************************************/
73 HLIST_HEAD(atalk_sockets);
74 DEFINE_RWLOCK(atalk_sockets_lock);
76 static inline void __atalk_insert_socket(struct sock *sk)
78 sk_add_node(sk, &atalk_sockets);
81 static inline void atalk_remove_socket(struct sock *sk)
83 write_lock_bh(&atalk_sockets_lock);
85 write_unlock_bh(&atalk_sockets_lock);
88 static struct sock *atalk_search_socket(struct sockaddr_at *to,
89 struct atalk_iface *atif)
93 read_lock_bh(&atalk_sockets_lock);
94 sk_for_each(s, &atalk_sockets) {
95 struct atalk_sock *at = at_sk(s);
97 if (to->sat_port != at->src_port)
100 if (to->sat_addr.s_net == ATADDR_ANYNET &&
101 to->sat_addr.s_node == ATADDR_BCAST)
104 if (to->sat_addr.s_net == at->src_net &&
105 (to->sat_addr.s_node == at->src_node ||
106 to->sat_addr.s_node == ATADDR_BCAST ||
107 to->sat_addr.s_node == ATADDR_ANYNODE))
110 /* XXXX.0 -- we got a request for this router. make sure
111 * that the node is appropriately set. */
112 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
113 to->sat_addr.s_net != ATADDR_ANYNET &&
114 atif->address.s_node == at->src_node) {
115 to->sat_addr.s_node = atif->address.s_node;
121 read_unlock_bh(&atalk_sockets_lock);
126 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
127 * @sk: socket to insert in the list if it is not there already
128 * @sat: address to search for
130 * Try to find a socket matching ADDR in the socket list, if found then return
131 * it. If not, insert SK into the socket list.
133 * This entire operation must execute atomically.
135 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
136 struct sockaddr_at *sat)
139 struct atalk_sock *at;
141 write_lock_bh(&atalk_sockets_lock);
142 sk_for_each(s, &atalk_sockets) {
145 if (at->src_net == sat->sat_addr.s_net &&
146 at->src_node == sat->sat_addr.s_node &&
147 at->src_port == sat->sat_port)
151 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
153 write_unlock_bh(&atalk_sockets_lock);
157 static void atalk_destroy_timer(struct timer_list *t)
159 struct sock *sk = from_timer(sk, t, sk_timer);
161 if (sk_has_allocations(sk)) {
162 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
163 add_timer(&sk->sk_timer);
168 static inline void atalk_destroy_socket(struct sock *sk)
170 atalk_remove_socket(sk);
171 skb_queue_purge(&sk->sk_receive_queue);
173 if (sk_has_allocations(sk)) {
174 timer_setup(&sk->sk_timer, atalk_destroy_timer, 0);
175 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
176 add_timer(&sk->sk_timer);
181 /**************************************************************************\
183 * Routing tables for the AppleTalk socket layer. *
185 \**************************************************************************/
187 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
188 struct atalk_route *atalk_routes;
189 DEFINE_RWLOCK(atalk_routes_lock);
191 struct atalk_iface *atalk_interfaces;
192 DEFINE_RWLOCK(atalk_interfaces_lock);
194 /* For probing devices or in a routerless network */
195 struct atalk_route atrtr_default;
197 /* AppleTalk interface control */
199 * Drop a device. Doesn't drop any of its routes - that is the caller's
200 * problem. Called when we down the interface or delete the address.
202 static void atif_drop_device(struct net_device *dev)
204 struct atalk_iface **iface = &atalk_interfaces;
205 struct atalk_iface *tmp;
207 write_lock_bh(&atalk_interfaces_lock);
208 while ((tmp = *iface) != NULL) {
209 if (tmp->dev == dev) {
213 dev->atalk_ptr = NULL;
217 write_unlock_bh(&atalk_interfaces_lock);
220 static struct atalk_iface *atif_add_device(struct net_device *dev,
221 struct atalk_addr *sa)
223 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
230 dev->atalk_ptr = iface;
231 iface->address = *sa;
234 write_lock_bh(&atalk_interfaces_lock);
235 iface->next = atalk_interfaces;
236 atalk_interfaces = iface;
237 write_unlock_bh(&atalk_interfaces_lock);
242 /* Perform phase 2 AARP probing on our tentative address */
243 static int atif_probe_device(struct atalk_iface *atif)
245 int netrange = ntohs(atif->nets.nr_lastnet) -
246 ntohs(atif->nets.nr_firstnet) + 1;
247 int probe_net = ntohs(atif->address.s_net);
248 int probe_node = atif->address.s_node;
251 /* Offset the network we start probing with */
252 if (probe_net == ATADDR_ANYNET) {
253 probe_net = ntohs(atif->nets.nr_firstnet);
255 probe_net += jiffies % netrange;
257 if (probe_node == ATADDR_ANYNODE)
258 probe_node = jiffies & 0xFF;
260 /* Scan the networks */
261 atif->status |= ATIF_PROBE;
262 for (netct = 0; netct <= netrange; netct++) {
263 /* Sweep the available nodes from a given start */
264 atif->address.s_net = htons(probe_net);
265 for (nodect = 0; nodect < 256; nodect++) {
266 atif->address.s_node = (nodect + probe_node) & 0xFF;
267 if (atif->address.s_node > 0 &&
268 atif->address.s_node < 254) {
269 /* Probe a proposed address */
270 aarp_probe_network(atif);
272 if (!(atif->status & ATIF_PROBE_FAIL)) {
273 atif->status &= ~ATIF_PROBE;
277 atif->status &= ~ATIF_PROBE_FAIL;
280 if (probe_net > ntohs(atif->nets.nr_lastnet))
281 probe_net = ntohs(atif->nets.nr_firstnet);
283 atif->status &= ~ATIF_PROBE;
285 return -EADDRINUSE; /* Network is full... */
289 /* Perform AARP probing for a proxy address */
290 static int atif_proxy_probe_device(struct atalk_iface *atif,
291 struct atalk_addr *proxy_addr)
293 int netrange = ntohs(atif->nets.nr_lastnet) -
294 ntohs(atif->nets.nr_firstnet) + 1;
295 /* we probe the interface's network */
296 int probe_net = ntohs(atif->address.s_net);
297 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
300 /* Offset the network we start probing with */
301 if (probe_net == ATADDR_ANYNET) {
302 probe_net = ntohs(atif->nets.nr_firstnet);
304 probe_net += jiffies % netrange;
307 if (probe_node == ATADDR_ANYNODE)
308 probe_node = jiffies & 0xFF;
310 /* Scan the networks */
311 for (netct = 0; netct <= netrange; netct++) {
312 /* Sweep the available nodes from a given start */
313 proxy_addr->s_net = htons(probe_net);
314 for (nodect = 0; nodect < 256; nodect++) {
315 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
316 if (proxy_addr->s_node > 0 &&
317 proxy_addr->s_node < 254) {
318 /* Tell AARP to probe a proposed address */
319 int ret = aarp_proxy_probe_network(atif,
322 if (ret != -EADDRINUSE)
327 if (probe_net > ntohs(atif->nets.nr_lastnet))
328 probe_net = ntohs(atif->nets.nr_firstnet);
331 return -EADDRINUSE; /* Network is full... */
335 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
337 struct atalk_iface *iface = dev->atalk_ptr;
338 return iface ? &iface->address : NULL;
341 static struct atalk_addr *atalk_find_primary(void)
343 struct atalk_iface *fiface = NULL;
344 struct atalk_addr *retval;
345 struct atalk_iface *iface;
348 * Return a point-to-point interface only if
349 * there is no non-ptp interface available.
351 read_lock_bh(&atalk_interfaces_lock);
352 for (iface = atalk_interfaces; iface; iface = iface->next) {
353 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
355 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
356 retval = &iface->address;
362 retval = &fiface->address;
363 else if (atalk_interfaces)
364 retval = &atalk_interfaces->address;
368 read_unlock_bh(&atalk_interfaces_lock);
373 * Find a match for 'any network' - ie any of our interfaces with that
374 * node number will do just nicely.
376 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
378 struct atalk_iface *iface = dev->atalk_ptr;
380 if (!iface || iface->status & ATIF_PROBE)
383 if (node != ATADDR_BCAST &&
384 iface->address.s_node != node &&
385 node != ATADDR_ANYNODE)
394 /* Find a match for a specific network:node pair */
395 static struct atalk_iface *atalk_find_interface(__be16 net, int node)
397 struct atalk_iface *iface;
399 read_lock_bh(&atalk_interfaces_lock);
400 for (iface = atalk_interfaces; iface; iface = iface->next) {
401 if ((node == ATADDR_BCAST ||
402 node == ATADDR_ANYNODE ||
403 iface->address.s_node == node) &&
404 iface->address.s_net == net &&
405 !(iface->status & ATIF_PROBE))
408 /* XXXX.0 -- net.0 returns the iface associated with net */
409 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
410 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
411 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
414 read_unlock_bh(&atalk_interfaces_lock);
420 * Find a route for an AppleTalk packet. This ought to get cached in
421 * the socket (later on...). We know about host routes and the fact
422 * that a route must be direct to broadcast.
424 static struct atalk_route *atrtr_find(struct atalk_addr *target)
427 * we must search through all routes unless we find a
428 * host route, because some host routes might overlap
431 struct atalk_route *net_route = NULL;
432 struct atalk_route *r;
434 read_lock_bh(&atalk_routes_lock);
435 for (r = atalk_routes; r; r = r->next) {
436 if (!(r->flags & RTF_UP))
439 if (r->target.s_net == target->s_net) {
440 if (r->flags & RTF_HOST) {
442 * if this host route is for the target,
445 if (r->target.s_node == target->s_node)
449 * this route will work if there isn't a
450 * direct host route, so cache it
457 * if we found a network route but not a direct host
458 * route, then return it
462 else if (atrtr_default.dev)
464 else /* No route can be found */
467 read_unlock_bh(&atalk_routes_lock);
473 * Given an AppleTalk network, find the device to use. This can be
476 struct net_device *atrtr_get_dev(struct atalk_addr *sa)
478 struct atalk_route *atr = atrtr_find(sa);
479 return atr ? atr->dev : NULL;
482 /* Set up a default router */
483 static void atrtr_set_default(struct net_device *dev)
485 atrtr_default.dev = dev;
486 atrtr_default.flags = RTF_UP;
487 atrtr_default.gateway.s_net = htons(0);
488 atrtr_default.gateway.s_node = 0;
492 * Add a router. Basically make sure it looks valid and stuff the
493 * entry in the list. While it uses netranges we always set them to one
494 * entry to work like netatalk.
496 static int atrtr_create(struct rtentry *r, struct net_device *devhint)
498 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
499 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
500 struct atalk_route *rt;
501 struct atalk_iface *iface, *riface;
502 int retval = -EINVAL;
505 * Fixme: Raise/Lower a routing change semaphore for these
509 /* Validate the request */
510 if (ta->sat_family != AF_APPLETALK ||
511 (!devhint && ga->sat_family != AF_APPLETALK))
514 /* Now walk the routing table and make our decisions */
515 write_lock_bh(&atalk_routes_lock);
516 for (rt = atalk_routes; rt; rt = rt->next) {
517 if (r->rt_flags != rt->flags)
520 if (ta->sat_addr.s_net == rt->target.s_net) {
521 if (!(rt->flags & RTF_HOST))
523 if (ta->sat_addr.s_node == rt->target.s_node)
531 read_lock_bh(&atalk_interfaces_lock);
532 for (iface = atalk_interfaces; iface; iface = iface->next) {
534 ntohs(ga->sat_addr.s_net) >=
535 ntohs(iface->nets.nr_firstnet) &&
536 ntohs(ga->sat_addr.s_net) <=
537 ntohs(iface->nets.nr_lastnet))
540 if (ga->sat_addr.s_net == iface->address.s_net &&
541 ga->sat_addr.s_node == iface->address.s_node)
544 read_unlock_bh(&atalk_interfaces_lock);
546 retval = -ENETUNREACH;
550 devhint = riface->dev;
554 rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
560 rt->next = atalk_routes;
564 /* Fill in the routing entry */
565 rt->target = ta->sat_addr;
568 rt->flags = r->rt_flags;
569 rt->gateway = ga->sat_addr;
573 write_unlock_bh(&atalk_routes_lock);
578 /* Delete a route. Find it and discard it */
579 static int atrtr_delete(struct atalk_addr *addr)
581 struct atalk_route **r = &atalk_routes;
583 struct atalk_route *tmp;
585 write_lock_bh(&atalk_routes_lock);
586 while ((tmp = *r) != NULL) {
587 if (tmp->target.s_net == addr->s_net &&
588 (!(tmp->flags&RTF_GATEWAY) ||
589 tmp->target.s_node == addr->s_node)) {
599 write_unlock_bh(&atalk_routes_lock);
604 * Called when a device is downed. Just throw away any routes
607 static void atrtr_device_down(struct net_device *dev)
609 struct atalk_route **r = &atalk_routes;
610 struct atalk_route *tmp;
612 write_lock_bh(&atalk_routes_lock);
613 while ((tmp = *r) != NULL) {
614 if (tmp->dev == dev) {
621 write_unlock_bh(&atalk_routes_lock);
623 if (atrtr_default.dev == dev)
624 atrtr_set_default(NULL);
627 /* Actually down the interface */
628 static inline void atalk_dev_down(struct net_device *dev)
630 atrtr_device_down(dev); /* Remove all routes for the device */
631 aarp_device_down(dev); /* Remove AARP entries for the device */
632 atif_drop_device(dev); /* Remove the device */
636 * A device event has occurred. Watch for devices going down and
637 * delete our use of them (iface and route).
639 static int ddp_device_event(struct notifier_block *this, unsigned long event,
642 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
644 if (!net_eq(dev_net(dev), &init_net))
647 if (event == NETDEV_DOWN)
648 /* Discard any use of this */
654 /* ioctl calls. Shouldn't even need touching */
655 /* Device configuration ioctl calls */
656 static int atif_ioctl(int cmd, void __user *arg)
658 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
660 struct atalk_netrange *nr;
661 struct sockaddr_at *sa;
662 struct net_device *dev;
663 struct atalk_iface *atif;
666 struct rtentry rtdef;
669 if (get_user_ifreq(&atreq, NULL, arg))
672 dev = __dev_get_by_name(&init_net, atreq.ifr_name);
676 sa = (struct sockaddr_at *)&atreq.ifr_addr;
677 atif = atalk_find_dev(dev);
681 if (!capable(CAP_NET_ADMIN))
683 if (sa->sat_family != AF_APPLETALK)
685 if (dev->type != ARPHRD_ETHER &&
686 dev->type != ARPHRD_LOOPBACK &&
687 dev->type != ARPHRD_LOCALTLK &&
688 dev->type != ARPHRD_PPP)
689 return -EPROTONOSUPPORT;
691 nr = (struct atalk_netrange *)&sa->sat_zero[0];
695 * if this is a point-to-point iface, and we already
696 * have an iface for this AppleTalk address, then we
697 * should not add a route
699 if ((dev->flags & IFF_POINTOPOINT) &&
700 atalk_find_interface(sa->sat_addr.s_net,
701 sa->sat_addr.s_node)) {
702 printk(KERN_DEBUG "AppleTalk: point-to-point "
703 "interface added with "
704 "existing address\n");
709 * Phase 1 is fine on LocalTalk but we don't do
710 * EtherTalk phase 1. Anyone wanting to add it, go ahead.
712 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
713 return -EPROTONOSUPPORT;
714 if (sa->sat_addr.s_node == ATADDR_BCAST ||
715 sa->sat_addr.s_node == 254)
718 /* Already setting address */
719 if (atif->status & ATIF_PROBE)
722 atif->address.s_net = sa->sat_addr.s_net;
723 atif->address.s_node = sa->sat_addr.s_node;
724 atrtr_device_down(dev); /* Flush old routes */
726 atif = atif_add_device(dev, &sa->sat_addr);
733 * Check if the chosen address is used. If so we
734 * error and atalkd will try another.
737 if (!(dev->flags & IFF_LOOPBACK) &&
738 !(dev->flags & IFF_POINTOPOINT) &&
739 atif_probe_device(atif) < 0) {
740 atif_drop_device(dev);
744 /* Hey it worked - add the direct routes */
745 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
746 sa->sat_family = AF_APPLETALK;
747 sa->sat_addr.s_net = atif->address.s_net;
748 sa->sat_addr.s_node = atif->address.s_node;
749 sa = (struct sockaddr_at *)&rtdef.rt_dst;
750 rtdef.rt_flags = RTF_UP;
751 sa->sat_family = AF_APPLETALK;
752 sa->sat_addr.s_node = ATADDR_ANYNODE;
753 if (dev->flags & IFF_LOOPBACK ||
754 dev->flags & IFF_POINTOPOINT)
755 rtdef.rt_flags |= RTF_HOST;
757 /* Routerless initial state */
758 if (nr->nr_firstnet == htons(0) &&
759 nr->nr_lastnet == htons(0xFFFE)) {
760 sa->sat_addr.s_net = atif->address.s_net;
761 atrtr_create(&rtdef, dev);
762 atrtr_set_default(dev);
764 limit = ntohs(nr->nr_lastnet);
765 if (limit - ntohs(nr->nr_firstnet) > 4096) {
766 printk(KERN_WARNING "Too many routes/"
771 for (ct = ntohs(nr->nr_firstnet);
773 sa->sat_addr.s_net = htons(ct);
774 atrtr_create(&rtdef, dev);
777 dev_mc_add_global(dev, aarp_mcast);
782 return -EADDRNOTAVAIL;
784 sa->sat_family = AF_APPLETALK;
785 sa->sat_addr = atif->address;
790 return -EADDRNOTAVAIL;
792 sa->sat_family = AF_APPLETALK;
793 sa->sat_addr.s_net = atif->address.s_net;
794 sa->sat_addr.s_node = ATADDR_BCAST;
797 case SIOCATALKDIFADDR:
799 if (!capable(CAP_NET_ADMIN))
801 if (sa->sat_family != AF_APPLETALK)
807 if (!capable(CAP_NET_ADMIN))
809 if (sa->sat_family != AF_APPLETALK)
812 * for now, we only support proxy AARP on ELAP;
813 * we should be able to do it for LocalTalk, too.
815 if (dev->type != ARPHRD_ETHER)
816 return -EPROTONOSUPPORT;
819 * atif points to the current interface on this network;
820 * we aren't concerned about its current status (at
821 * least for now), but it has all the settings about
822 * the network we're going to probe. Consequently, it
826 return -EADDRNOTAVAIL;
828 nr = (struct atalk_netrange *)&(atif->nets);
830 * Phase 1 is fine on Localtalk but we don't do
831 * Ethertalk phase 1. Anyone wanting to add it, go ahead.
833 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
834 return -EPROTONOSUPPORT;
836 if (sa->sat_addr.s_node == ATADDR_BCAST ||
837 sa->sat_addr.s_node == 254)
841 * Check if the chosen address is used. If so we
842 * error and ATCP will try another.
844 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
848 * We now have an address on the local network, and
849 * the AARP code will defend it for us until we take it
850 * down. We don't set up any routes right now, because
851 * ATCP will install them manually via SIOCADDRT.
856 if (!capable(CAP_NET_ADMIN))
858 if (sa->sat_family != AF_APPLETALK)
861 return -EADDRNOTAVAIL;
863 /* give to aarp module to remove proxy entry */
864 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
868 return put_user_ifreq(&atreq, arg);
871 static int atrtr_ioctl_addrt(struct rtentry *rt)
873 struct net_device *dev = NULL;
878 if (copy_from_user(name, rt->rt_dev, IFNAMSIZ-1))
880 name[IFNAMSIZ-1] = '\0';
882 dev = __dev_get_by_name(&init_net, name);
886 return atrtr_create(rt, dev);
889 /* Routing ioctl() calls */
890 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
894 if (copy_from_user(&rt, arg, sizeof(rt)))
899 if (rt.rt_dst.sa_family != AF_APPLETALK)
901 return atrtr_delete(&((struct sockaddr_at *)
902 &rt.rt_dst)->sat_addr);
905 return atrtr_ioctl_addrt(&rt);
910 /**************************************************************************\
912 * Handling for system calls applied via the various interfaces to an *
913 * AppleTalk socket object. *
915 \**************************************************************************/
918 * Checksum: This is 'optional'. It's quite likely also a good
919 * candidate for assembler hackery 8)
921 static unsigned long atalk_sum_partial(const unsigned char *data,
922 int len, unsigned long sum)
924 /* This ought to be unwrapped neatly. I'll trust gcc for now */
932 /* Checksum skb data -- similar to skb_checksum */
933 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
934 int len, unsigned long sum)
936 int start = skb_headlen(skb);
937 struct sk_buff *frag_iter;
940 /* checksum stuff in header space */
941 if ((copy = start - offset) > 0) {
944 sum = atalk_sum_partial(skb->data + offset, copy, sum);
945 if ((len -= copy) == 0)
951 /* checksum stuff in frags */
952 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
954 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
955 WARN_ON(start > offset + len);
957 end = start + skb_frag_size(frag);
958 if ((copy = end - offset) > 0) {
963 vaddr = kmap_atomic(skb_frag_page(frag));
964 sum = atalk_sum_partial(vaddr + skb_frag_off(frag) +
965 offset - start, copy, sum);
966 kunmap_atomic(vaddr);
975 skb_walk_frags(skb, frag_iter) {
978 WARN_ON(start > offset + len);
980 end = start + frag_iter->len;
981 if ((copy = end - offset) > 0) {
984 sum = atalk_sum_skb(frag_iter, offset - start,
986 if ((len -= copy) == 0)
998 static __be16 atalk_checksum(const struct sk_buff *skb, int len)
1002 /* skip header 4 bytes */
1003 sum = atalk_sum_skb(skb, 4, len-4, 0);
1005 /* Use 0xFFFF for 0. 0 itself means none */
1006 return sum ? htons((unsigned short)sum) : htons(0xFFFF);
1009 static struct proto ddp_proto = {
1011 .owner = THIS_MODULE,
1012 .obj_size = sizeof(struct atalk_sock),
1016 * Create a socket. Initialise the socket, blank the addresses
1019 static int atalk_create(struct net *net, struct socket *sock, int protocol,
1023 int rc = -ESOCKTNOSUPPORT;
1025 if (!net_eq(net, &init_net))
1026 return -EAFNOSUPPORT;
1029 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1030 * and gives you the full ELAP frame. Should be handy for CAP 8)
1032 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1036 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1040 sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, kern);
1044 sock->ops = &atalk_dgram_ops;
1045 sock_init_data(sock, sk);
1047 /* Checksums on by default */
1048 sock_set_flag(sk, SOCK_ZAPPED);
1053 /* Free a socket. No work needed */
1054 static int atalk_release(struct socket *sock)
1056 struct sock *sk = sock->sk;
1064 atalk_destroy_socket(sk);
1073 * atalk_pick_and_bind_port - Pick a source port when one is not given
1074 * @sk: socket to insert into the tables
1075 * @sat: address to search for
1077 * Pick a source port when one is not given. If we can find a suitable free
1078 * one, we insert the socket into the tables using it.
1080 * This whole operation must be atomic.
1082 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1086 write_lock_bh(&atalk_sockets_lock);
1088 for (sat->sat_port = ATPORT_RESERVED;
1089 sat->sat_port < ATPORT_LAST;
1093 sk_for_each(s, &atalk_sockets) {
1094 struct atalk_sock *at = at_sk(s);
1096 if (at->src_net == sat->sat_addr.s_net &&
1097 at->src_node == sat->sat_addr.s_node &&
1098 at->src_port == sat->sat_port)
1102 /* Wheee, it's free, assign and insert. */
1103 __atalk_insert_socket(sk);
1104 at_sk(sk)->src_port = sat->sat_port;
1113 write_unlock_bh(&atalk_sockets_lock);
1117 static int atalk_autobind(struct sock *sk)
1119 struct atalk_sock *at = at_sk(sk);
1120 struct sockaddr_at sat;
1121 struct atalk_addr *ap = atalk_find_primary();
1122 int n = -EADDRNOTAVAIL;
1124 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1127 at->src_net = sat.sat_addr.s_net = ap->s_net;
1128 at->src_node = sat.sat_addr.s_node = ap->s_node;
1130 n = atalk_pick_and_bind_port(sk, &sat);
1132 sock_reset_flag(sk, SOCK_ZAPPED);
1137 /* Set the address 'our end' of the connection */
1138 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1140 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1141 struct sock *sk = sock->sk;
1142 struct atalk_sock *at = at_sk(sk);
1145 if (!sock_flag(sk, SOCK_ZAPPED) ||
1146 addr_len != sizeof(struct sockaddr_at))
1149 if (addr->sat_family != AF_APPLETALK)
1150 return -EAFNOSUPPORT;
1153 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1154 struct atalk_addr *ap = atalk_find_primary();
1156 err = -EADDRNOTAVAIL;
1160 at->src_net = addr->sat_addr.s_net = ap->s_net;
1161 at->src_node = addr->sat_addr.s_node = ap->s_node;
1163 err = -EADDRNOTAVAIL;
1164 if (!atalk_find_interface(addr->sat_addr.s_net,
1165 addr->sat_addr.s_node))
1168 at->src_net = addr->sat_addr.s_net;
1169 at->src_node = addr->sat_addr.s_node;
1172 if (addr->sat_port == ATADDR_ANYPORT) {
1173 err = atalk_pick_and_bind_port(sk, addr);
1178 at->src_port = addr->sat_port;
1181 if (atalk_find_or_insert_socket(sk, addr))
1185 sock_reset_flag(sk, SOCK_ZAPPED);
1192 /* Set the address we talk to */
1193 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1194 int addr_len, int flags)
1196 struct sock *sk = sock->sk;
1197 struct atalk_sock *at = at_sk(sk);
1198 struct sockaddr_at *addr;
1201 sk->sk_state = TCP_CLOSE;
1202 sock->state = SS_UNCONNECTED;
1204 if (addr_len != sizeof(*addr))
1207 addr = (struct sockaddr_at *)uaddr;
1209 if (addr->sat_family != AF_APPLETALK)
1210 return -EAFNOSUPPORT;
1212 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1213 !sock_flag(sk, SOCK_BROADCAST)) {
1215 pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n",
1224 if (sock_flag(sk, SOCK_ZAPPED))
1225 if (atalk_autobind(sk) < 0)
1229 if (!atrtr_get_dev(&addr->sat_addr))
1232 at->dest_port = addr->sat_port;
1233 at->dest_net = addr->sat_addr.s_net;
1234 at->dest_node = addr->sat_addr.s_node;
1236 sock->state = SS_CONNECTED;
1237 sk->sk_state = TCP_ESTABLISHED;
1245 * Find the name of an AppleTalk socket. Just copy the right
1246 * fields into the sockaddr.
1248 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1251 struct sockaddr_at sat;
1252 struct sock *sk = sock->sk;
1253 struct atalk_sock *at = at_sk(sk);
1258 if (sock_flag(sk, SOCK_ZAPPED))
1259 if (atalk_autobind(sk) < 0)
1262 memset(&sat, 0, sizeof(sat));
1266 if (sk->sk_state != TCP_ESTABLISHED)
1269 sat.sat_addr.s_net = at->dest_net;
1270 sat.sat_addr.s_node = at->dest_node;
1271 sat.sat_port = at->dest_port;
1273 sat.sat_addr.s_net = at->src_net;
1274 sat.sat_addr.s_node = at->src_node;
1275 sat.sat_port = at->src_port;
1278 sat.sat_family = AF_APPLETALK;
1279 memcpy(uaddr, &sat, sizeof(sat));
1280 err = sizeof(struct sockaddr_at);
1287 static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1288 struct ddpehdr *ddp, __u16 len_hops, int origlen)
1290 struct atalk_route *rt;
1291 struct atalk_addr ta;
1294 * Don't route multicast, etc., packets, or packets sent to "this
1297 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1301 * Can it ever happen that a packet is from a PPP iface and
1302 * needs to be broadcast onto the default network?
1304 if (dev->type == ARPHRD_PPP)
1305 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1306 "packet received from PPP iface\n");
1310 ta.s_net = ddp->deh_dnet;
1311 ta.s_node = ddp->deh_dnode;
1313 /* Route the packet */
1314 rt = atrtr_find(&ta);
1315 /* increment hops count */
1316 len_hops += 1 << 10;
1317 if (!rt || !(len_hops & (15 << 10)))
1320 /* FIXME: use skb->cb to be able to use shared skbs */
1323 * Route goes through another gateway, so set the target to the
1327 if (rt->flags & RTF_GATEWAY) {
1328 ta.s_net = rt->gateway.s_net;
1329 ta.s_node = rt->gateway.s_node;
1332 /* Fix up skb->len field */
1333 skb_trim(skb, min_t(unsigned int, origlen,
1334 (rt->dev->hard_header_len +
1335 ddp_dl->header_length + (len_hops & 1023))));
1337 /* FIXME: use skb->cb to be able to use shared skbs */
1338 ddp->deh_len_hops = htons(len_hops);
1341 * Send the buffer onwards
1343 * Now we must always be careful. If it's come from LocalTalk to
1344 * EtherTalk it might not fit
1346 * Order matters here: If a packet has to be copied to make a new
1347 * headroom (rare hopefully) then it won't need unsharing.
1349 * Note. ddp-> becomes invalid at the realloc.
1351 if (skb_headroom(skb) < 22) {
1352 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1353 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1357 skb = skb_unshare(skb, GFP_ATOMIC);
1360 * If the buffer didn't vanish into the lack of space bitbucket we can
1366 if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
1368 return NET_RX_SUCCESS;
1376 * atalk_rcv - Receive a packet (in skb) from device dev
1377 * @skb: packet received
1378 * @dev: network device where the packet comes from
1380 * @orig_dev: the original receive net device
1382 * Receive a packet (in skb) from device dev. This has come from the SNAP
1383 * decoder, and on entry skb->transport_header is the DDP header, skb->len
1384 * is the DDP header, skb->len is the DDP length. The physical headers
1385 * have been extracted. PPP should probably pass frames marked as for this
1386 * layer. [ie ARPHRD_ETHERTALK]
1388 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1389 struct packet_type *pt, struct net_device *orig_dev)
1391 struct ddpehdr *ddp;
1393 struct atalk_iface *atif;
1394 struct sockaddr_at tosat;
1398 if (!net_eq(dev_net(dev), &init_net))
1401 /* Don't mangle buffer if shared */
1402 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1405 /* Size check and make sure header is contiguous */
1406 if (!pskb_may_pull(skb, sizeof(*ddp)))
1411 len_hops = ntohs(ddp->deh_len_hops);
1413 /* Trim buffer in case of stray trailing data */
1415 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1418 * Size check to see if ddp->deh_len was crap
1419 * (Otherwise we'll detonate most spectacularly
1420 * in the middle of atalk_checksum() or recvmsg()).
1422 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1423 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1424 "skb->len=%u)\n", len_hops & 1023, skb->len);
1429 * Any checksums. Note we don't do htons() on this == is assumed to be
1430 * valid for net byte orders all over the networking code...
1433 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1434 /* Not a valid AppleTalk frame - dustbin time */
1437 /* Check the packet is aimed at us */
1438 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1439 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1441 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1444 /* Not ours, so we route the packet via the correct
1447 return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1451 * Which socket - atalk_search_socket() looks for a *full match*
1452 * of the <net, node, port> tuple.
1454 tosat.sat_addr.s_net = ddp->deh_dnet;
1455 tosat.sat_addr.s_node = ddp->deh_dnode;
1456 tosat.sat_port = ddp->deh_dport;
1458 sock = atalk_search_socket(&tosat, atif);
1459 if (!sock) /* But not one of our sockets */
1462 /* Queue packet (standard) */
1463 if (sock_queue_rcv_skb(sock, skb) < 0)
1466 return NET_RX_SUCCESS;
1476 * Receive a LocalTalk frame. We make some demands on the caller here.
1477 * Caller must provide enough headroom on the packet to pull the short
1478 * header and append a long one.
1480 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1481 struct packet_type *pt, struct net_device *orig_dev)
1483 if (!net_eq(dev_net(dev), &init_net))
1486 /* Expand any short form frames */
1487 if (skb_mac_header(skb)[2] == 1) {
1488 struct ddpehdr *ddp;
1489 /* Find our address */
1490 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1492 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1495 /* Don't mangle buffer if shared */
1496 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1500 * The push leaves us with a ddephdr not an shdr, and
1501 * handily the port bytes in the right place preset.
1503 ddp = skb_push(skb, sizeof(*ddp) - 4);
1505 /* Now fill in the long header */
1508 * These two first. The mac overlays the new source/dest
1509 * network information so we MUST copy these before
1510 * we write the network numbers !
1513 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1514 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
1516 ddp->deh_dnet = ap->s_net; /* Network number */
1517 ddp->deh_snet = ap->s_net;
1518 ddp->deh_sum = 0; /* No checksum */
1520 * Not sure about this bit...
1522 /* Non routable, so force a drop if we slip up later */
1523 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1525 skb_reset_transport_header(skb);
1527 return atalk_rcv(skb, dev, pt, orig_dev);
1533 static int atalk_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1535 struct sock *sk = sock->sk;
1536 struct atalk_sock *at = at_sk(sk);
1537 DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name);
1538 int flags = msg->msg_flags;
1540 struct sockaddr_at local_satalk, gsat;
1541 struct sk_buff *skb;
1542 struct net_device *dev;
1543 struct ddpehdr *ddp;
1544 int size, hard_header_len;
1545 struct atalk_route *rt, *rt_lo = NULL;
1548 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1551 if (len > DDP_MAXSZ)
1557 if (sock_flag(sk, SOCK_ZAPPED))
1558 if (atalk_autobind(sk) < 0)
1562 if (msg->msg_namelen < sizeof(*usat) ||
1563 usat->sat_family != AF_APPLETALK)
1567 /* netatalk didn't implement this check */
1568 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1569 !sock_flag(sk, SOCK_BROADCAST)) {
1574 if (sk->sk_state != TCP_ESTABLISHED)
1576 usat = &local_satalk;
1577 usat->sat_family = AF_APPLETALK;
1578 usat->sat_port = at->dest_port;
1579 usat->sat_addr.s_node = at->dest_node;
1580 usat->sat_addr.s_net = at->dest_net;
1583 /* Build a packet */
1584 net_dbg_ratelimited("SK %p: Got address.\n", sk);
1587 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1589 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1590 rt = atrtr_find(&usat->sat_addr);
1592 struct atalk_addr at_hint;
1595 at_hint.s_net = at->src_net;
1597 rt = atrtr_find(&at_hint);
1605 net_dbg_ratelimited("SK %p: Size needed %d, device %s\n",
1606 sk, size, dev->name);
1608 hard_header_len = dev->hard_header_len;
1609 /* Leave room for loopback hardware header if necessary */
1610 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1611 (dev->flags & IFF_LOOPBACK || !(rt->flags & RTF_GATEWAY))) {
1612 struct atalk_addr at_lo;
1617 rt_lo = atrtr_find(&at_lo);
1619 if (rt_lo && rt_lo->dev->hard_header_len > hard_header_len)
1620 hard_header_len = rt_lo->dev->hard_header_len;
1623 size += hard_header_len;
1625 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1630 skb_reserve(skb, ddp_dl->header_length);
1631 skb_reserve(skb, hard_header_len);
1634 net_dbg_ratelimited("SK %p: Begin build.\n", sk);
1636 ddp = skb_put(skb, sizeof(struct ddpehdr));
1637 ddp->deh_len_hops = htons(len + sizeof(*ddp));
1638 ddp->deh_dnet = usat->sat_addr.s_net;
1639 ddp->deh_snet = at->src_net;
1640 ddp->deh_dnode = usat->sat_addr.s_node;
1641 ddp->deh_snode = at->src_node;
1642 ddp->deh_dport = usat->sat_port;
1643 ddp->deh_sport = at->src_port;
1645 net_dbg_ratelimited("SK %p: Copy user data (%zd bytes).\n", sk, len);
1647 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1654 if (sk->sk_no_check_tx)
1657 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1660 * Loopback broadcast packets to non gateway targets (ie routes
1661 * to group we are in)
1663 if (ddp->deh_dnode == ATADDR_BCAST &&
1664 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1665 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1669 net_dbg_ratelimited("SK %p: send out(copy).\n", sk);
1671 * If it fails it is queued/sent above in the aarp queue
1673 aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
1677 if (dev->flags & IFF_LOOPBACK || loopback) {
1678 net_dbg_ratelimited("SK %p: Loop back.\n", sk);
1681 if (ddp->deh_dnode == ATADDR_BCAST) {
1690 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1692 net_dbg_ratelimited("SK %p: send out.\n", sk);
1693 if (rt->flags & RTF_GATEWAY) {
1694 gsat.sat_addr = rt->gateway;
1699 * If it fails it is queued/sent above in the aarp queue
1701 aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
1703 net_dbg_ratelimited("SK %p: Done write (%zd).\n", sk, len);
1710 static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1713 struct sock *sk = sock->sk;
1714 struct ddpehdr *ddp;
1718 struct sk_buff *skb;
1720 skb = skb_recv_datagram(sk, flags, &err);
1726 /* FIXME: use skb->cb to be able to use shared skbs */
1728 copied = ntohs(ddp->deh_len_hops) & 1023;
1730 if (sk->sk_type != SOCK_RAW) {
1731 offset = sizeof(*ddp);
1735 if (copied > size) {
1737 msg->msg_flags |= MSG_TRUNC;
1739 err = skb_copy_datagram_msg(skb, offset, msg, copied);
1741 if (!err && msg->msg_name) {
1742 DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name);
1743 sat->sat_family = AF_APPLETALK;
1744 sat->sat_port = ddp->deh_sport;
1745 sat->sat_addr.s_node = ddp->deh_snode;
1746 sat->sat_addr.s_net = ddp->deh_snet;
1747 msg->msg_namelen = sizeof(*sat);
1750 skb_free_datagram(sk, skb); /* Free the datagram. */
1754 return err ? : copied;
1759 * AppleTalk ioctl calls.
1761 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1763 int rc = -ENOIOCTLCMD;
1764 struct sock *sk = sock->sk;
1765 void __user *argp = (void __user *)arg;
1768 /* Protocol layer */
1770 long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1774 rc = put_user(amount, (int __user *)argp);
1778 struct sk_buff *skb;
1781 spin_lock_irq(&sk->sk_receive_queue.lock);
1782 skb = skb_peek(&sk->sk_receive_queue);
1784 amount = skb->len - sizeof(struct ddpehdr);
1785 spin_unlock_irq(&sk->sk_receive_queue.lock);
1786 rc = put_user(amount, (int __user *)argp);
1793 if (capable(CAP_NET_ADMIN))
1794 rc = atrtr_ioctl(cmd, argp);
1799 case SIOCGIFBRDADDR:
1800 case SIOCATALKDIFADDR:
1802 case SIOCSARP: /* proxy AARP */
1803 case SIOCDARP: /* proxy AARP */
1805 rc = atif_ioctl(cmd, argp);
1814 #ifdef CONFIG_COMPAT
1815 static int atalk_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
1816 struct compat_rtentry __user *ur)
1818 compat_uptr_t rtdev;
1821 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
1822 3 * sizeof(struct sockaddr)) ||
1823 get_user(rt.rt_flags, &ur->rt_flags) ||
1824 get_user(rt.rt_metric, &ur->rt_metric) ||
1825 get_user(rt.rt_mtu, &ur->rt_mtu) ||
1826 get_user(rt.rt_window, &ur->rt_window) ||
1827 get_user(rt.rt_irtt, &ur->rt_irtt) ||
1828 get_user(rtdev, &ur->rt_dev))
1833 if (rt.rt_dst.sa_family != AF_APPLETALK)
1835 return atrtr_delete(&((struct sockaddr_at *)
1836 &rt.rt_dst)->sat_addr);
1839 rt.rt_dev = compat_ptr(rtdev);
1840 return atrtr_ioctl_addrt(&rt);
1845 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1847 void __user *argp = compat_ptr(arg);
1848 struct sock *sk = sock->sk;
1853 return atalk_compat_routing_ioctl(sk, cmd, argp);
1855 * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
1856 * cannot handle it in common code. The data we access if ifreq
1857 * here is compatible, so we can simply call the native
1860 case SIOCATALKDIFADDR:
1861 return atalk_ioctl(sock, cmd, (unsigned long)argp);
1863 return -ENOIOCTLCMD;
1866 #endif /* CONFIG_COMPAT */
1869 static const struct net_proto_family atalk_family_ops = {
1870 .family = PF_APPLETALK,
1871 .create = atalk_create,
1872 .owner = THIS_MODULE,
1875 static const struct proto_ops atalk_dgram_ops = {
1876 .family = PF_APPLETALK,
1877 .owner = THIS_MODULE,
1878 .release = atalk_release,
1880 .connect = atalk_connect,
1881 .socketpair = sock_no_socketpair,
1882 .accept = sock_no_accept,
1883 .getname = atalk_getname,
1884 .poll = datagram_poll,
1885 .ioctl = atalk_ioctl,
1886 .gettstamp = sock_gettstamp,
1887 #ifdef CONFIG_COMPAT
1888 .compat_ioctl = atalk_compat_ioctl,
1890 .listen = sock_no_listen,
1891 .shutdown = sock_no_shutdown,
1892 .sendmsg = atalk_sendmsg,
1893 .recvmsg = atalk_recvmsg,
1894 .mmap = sock_no_mmap,
1897 static struct notifier_block ddp_notifier = {
1898 .notifier_call = ddp_device_event,
1901 static struct packet_type ltalk_packet_type __read_mostly = {
1902 .type = cpu_to_be16(ETH_P_LOCALTALK),
1906 static struct packet_type ppptalk_packet_type __read_mostly = {
1907 .type = cpu_to_be16(ETH_P_PPPTALK),
1911 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1913 /* Export symbols for use by drivers when AppleTalk is a module */
1914 EXPORT_SYMBOL(atrtr_get_dev);
1915 EXPORT_SYMBOL(atalk_find_dev_addr);
1917 /* Called by proto.c on kernel start up */
1918 static int __init atalk_init(void)
1922 rc = proto_register(&ddp_proto, 0);
1926 rc = sock_register(&atalk_family_ops);
1930 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1932 pr_crit("Unable to register DDP with SNAP.\n");
1937 dev_add_pack(<alk_packet_type);
1938 dev_add_pack(&ppptalk_packet_type);
1940 rc = register_netdevice_notifier(&ddp_notifier);
1944 rc = aarp_proto_init();
1948 rc = atalk_proc_init();
1952 rc = atalk_register_sysctl();
1960 aarp_cleanup_module();
1962 unregister_netdevice_notifier(&ddp_notifier);
1964 dev_remove_pack(&ppptalk_packet_type);
1965 dev_remove_pack(<alk_packet_type);
1966 unregister_snap_client(ddp_dl);
1968 sock_unregister(PF_APPLETALK);
1970 proto_unregister(&ddp_proto);
1973 module_init(atalk_init);
1976 * No explicit module reference count manipulation is needed in the
1977 * protocol. Socket layer sets module reference count for us
1978 * and interfaces reference counting is done
1979 * by the network device layer.
1981 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1982 * sockets should be closed from user space.
1984 static void __exit atalk_exit(void)
1986 #ifdef CONFIG_SYSCTL
1987 atalk_unregister_sysctl();
1988 #endif /* CONFIG_SYSCTL */
1990 aarp_cleanup_module(); /* General aarp clean-up. */
1991 unregister_netdevice_notifier(&ddp_notifier);
1992 dev_remove_pack(<alk_packet_type);
1993 dev_remove_pack(&ppptalk_packet_type);
1994 unregister_snap_client(ddp_dl);
1995 sock_unregister(PF_APPLETALK);
1996 proto_unregister(&ddp_proto);
1998 module_exit(atalk_exit);
2000 MODULE_LICENSE("GPL");
2001 MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
2002 MODULE_DESCRIPTION("AppleTalk 0.20\n");
2003 MODULE_ALIAS_NETPROTO(PF_APPLETALK);