2 * DDP: An implementation of the AppleTalk DDP protocol for
5 * Alan Cox <Alan.Cox@linux.org>
7 * With more than a little assistance from
9 * Wesley Craig <netatalk@umich.edu>
12 * Michael Callahan : Made routing work
13 * Wesley Craig : Fix probing to listen to a
15 * Alan Cox : Added send/recvmsg support
16 * Alan Cox : Moved at. to protinfo in
18 * Alan Cox : Added firewall hooks.
19 * Alan Cox : Supports new ARPHRD_LOOPBACK
20 * Christer Weinigel : Routing and /proc fixes.
21 * Bradford Johnson : LocalTalk.
22 * Tom Dyas : Module support.
23 * Alan Cox : Hooks for PPP (based on the
25 * Alan Cox : Posix bits
26 * Alan Cox/Mike Freeman : Possible fix to NBP problems
27 * Bradford Johnson : IP-over-DDP (experimental)
28 * Jay Schulist : Moved IP-over-DDP to its own
29 * driver file. (ipddp.c & ipddp.h)
30 * Jay Schulist : Made work as module with
31 * AppleTalk drivers, cleaned it.
32 * Rob Newberry : Added proxy AARP and AARP
33 * procfs, moved probing to AARP
36 * Michael Zuelsdorff : fix for net.0 packets. don't
37 * allow illegal ether/tokentalk
38 * port assignment. we lose a
39 * valid localtalk port as a
41 * Arnaldo C. de Melo : Cleanup, in preparation for
42 * shared skb support 8)
43 * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c,
46 * This program is free software; you can redistribute it and/or
47 * modify it under the terms of the GNU General Public License
48 * as published by the Free Software Foundation; either version
49 * 2 of the License, or (at your option) any later version.
53 #include <linux/config.h>
54 #include <linux/module.h>
55 #include <linux/tcp.h>
56 #include <linux/if_arp.h>
57 #include <linux/termios.h> /* For TIOCOUTQ/INQ */
58 #include <net/datalink.h>
59 #include <net/psnap.h>
61 #include <net/route.h>
62 #include <linux/atalk.h>
64 struct datalink_proto *ddp_dl, *aarp_dl;
65 static struct proto_ops atalk_dgram_ops;
67 /**************************************************************************\
69 * Handlers for the socket list. *
71 \**************************************************************************/
73 HLIST_HEAD(atalk_sockets);
74 rwlock_t atalk_sockets_lock = RW_LOCK_UNLOCKED;
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)
92 struct hlist_node *node;
94 read_lock_bh(&atalk_sockets_lock);
95 sk_for_each(s, node, &atalk_sockets) {
96 struct atalk_sock *at = at_sk(s);
98 if (to->sat_port != at->src_port)
101 if (to->sat_addr.s_net == ATADDR_ANYNET &&
102 to->sat_addr.s_node == ATADDR_BCAST &&
103 at->src_net == atif->address.s_net)
106 if (to->sat_addr.s_net == at->src_net &&
107 (to->sat_addr.s_node == at->src_node ||
108 to->sat_addr.s_node == ATADDR_BCAST ||
109 to->sat_addr.s_node == ATADDR_ANYNODE))
112 /* XXXX.0 -- we got a request for this router. make sure
113 * that the node is appropriately set. */
114 if (to->sat_addr.s_node == ATADDR_ANYNODE &&
115 to->sat_addr.s_net != ATADDR_ANYNET &&
116 atif->address.s_node == at->src_node) {
117 to->sat_addr.s_node = atif->address.s_node;
123 read_unlock_bh(&atalk_sockets_lock);
128 * atalk_find_or_insert_socket - Try to find a socket matching ADDR
129 * @sk - socket to insert in the list if it is not there already
130 * @sat - address to search for
132 * Try to find a socket matching ADDR in the socket list, if found then return
133 * it. If not, insert SK into the socket list.
135 * This entire operation must execute atomically.
137 static struct sock *atalk_find_or_insert_socket(struct sock *sk,
138 struct sockaddr_at *sat)
141 struct hlist_node *node;
142 struct atalk_sock *at;
144 write_lock_bh(&atalk_sockets_lock);
145 sk_for_each(s, node, &atalk_sockets) {
148 if (at->src_net == sat->sat_addr.s_net &&
149 at->src_node == sat->sat_addr.s_node &&
150 at->src_port == sat->sat_port)
154 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
156 write_unlock_bh(&atalk_sockets_lock);
160 static void atalk_destroy_timer(unsigned long data)
162 struct sock *sk = (struct sock *)data;
164 if (atomic_read(&sk->sk_wmem_alloc) ||
165 atomic_read(&sk->sk_rmem_alloc)) {
166 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
167 add_timer(&sk->sk_timer);
172 static inline void atalk_destroy_socket(struct sock *sk)
174 atalk_remove_socket(sk);
175 skb_queue_purge(&sk->sk_receive_queue);
177 if (atomic_read(&sk->sk_wmem_alloc) ||
178 atomic_read(&sk->sk_rmem_alloc)) {
179 init_timer(&sk->sk_timer);
180 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
181 sk->sk_timer.function = atalk_destroy_timer;
182 sk->sk_timer.data = (unsigned long)sk;
183 add_timer(&sk->sk_timer);
188 /**************************************************************************\
190 * Routing tables for the AppleTalk socket layer. *
192 \**************************************************************************/
194 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
195 struct atalk_route *atalk_routes;
196 rwlock_t atalk_routes_lock = RW_LOCK_UNLOCKED;
198 struct atalk_iface *atalk_interfaces;
199 rwlock_t atalk_interfaces_lock = RW_LOCK_UNLOCKED;
201 /* For probing devices or in a routerless network */
202 struct atalk_route atrtr_default;
204 /* AppleTalk interface control */
206 * Drop a device. Doesn't drop any of its routes - that is the caller's
207 * problem. Called when we down the interface or delete the address.
209 static void atif_drop_device(struct net_device *dev)
211 struct atalk_iface **iface = &atalk_interfaces;
212 struct atalk_iface *tmp;
214 write_lock_bh(&atalk_interfaces_lock);
215 while ((tmp = *iface) != NULL) {
216 if (tmp->dev == dev) {
220 dev->atalk_ptr = NULL;
224 write_unlock_bh(&atalk_interfaces_lock);
227 static struct atalk_iface *atif_add_device(struct net_device *dev,
228 struct atalk_addr *sa)
230 struct atalk_iface *iface = kmalloc(sizeof(*iface), GFP_KERNEL);
235 memset(iface, 0, sizeof(*iface));
238 dev->atalk_ptr = iface;
239 iface->address = *sa;
242 write_lock_bh(&atalk_interfaces_lock);
243 iface->next = atalk_interfaces;
244 atalk_interfaces = iface;
245 write_unlock_bh(&atalk_interfaces_lock);
250 /* Perform phase 2 AARP probing on our tentative address */
251 static int atif_probe_device(struct atalk_iface *atif)
253 int netrange = ntohs(atif->nets.nr_lastnet) -
254 ntohs(atif->nets.nr_firstnet) + 1;
255 int probe_net = ntohs(atif->address.s_net);
256 int probe_node = atif->address.s_node;
259 /* Offset the network we start probing with */
260 if (probe_net == ATADDR_ANYNET) {
261 probe_net = ntohs(atif->nets.nr_firstnet);
263 probe_net += jiffies % netrange;
265 if (probe_node == ATADDR_ANYNODE)
266 probe_node = jiffies & 0xFF;
268 /* Scan the networks */
269 atif->status |= ATIF_PROBE;
270 for (netct = 0; netct <= netrange; netct++) {
271 /* Sweep the available nodes from a given start */
272 atif->address.s_net = htons(probe_net);
273 for (nodect = 0; nodect < 256; nodect++) {
274 atif->address.s_node = (nodect + probe_node) & 0xFF;
275 if (atif->address.s_node > 0 &&
276 atif->address.s_node < 254) {
277 /* Probe a proposed address */
278 aarp_probe_network(atif);
280 if (!(atif->status & ATIF_PROBE_FAIL)) {
281 atif->status &= ~ATIF_PROBE;
285 atif->status &= ~ATIF_PROBE_FAIL;
288 if (probe_net > ntohs(atif->nets.nr_lastnet))
289 probe_net = ntohs(atif->nets.nr_firstnet);
291 atif->status &= ~ATIF_PROBE;
293 return -EADDRINUSE; /* Network is full... */
297 /* Perform AARP probing for a proxy address */
298 static int atif_proxy_probe_device(struct atalk_iface *atif,
299 struct atalk_addr* proxy_addr)
301 int netrange = ntohs(atif->nets.nr_lastnet) -
302 ntohs(atif->nets.nr_firstnet) + 1;
303 /* we probe the interface's network */
304 int probe_net = ntohs(atif->address.s_net);
305 int probe_node = ATADDR_ANYNODE; /* we'll take anything */
308 /* Offset the network we start probing with */
309 if (probe_net == ATADDR_ANYNET) {
310 probe_net = ntohs(atif->nets.nr_firstnet);
312 probe_net += jiffies % netrange;
315 if (probe_node == ATADDR_ANYNODE)
316 probe_node = jiffies & 0xFF;
318 /* Scan the networks */
319 for (netct = 0; netct <= netrange; netct++) {
320 /* Sweep the available nodes from a given start */
321 proxy_addr->s_net = htons(probe_net);
322 for (nodect = 0; nodect < 256; nodect++) {
323 proxy_addr->s_node = (nodect + probe_node) & 0xFF;
324 if (proxy_addr->s_node > 0 &&
325 proxy_addr->s_node < 254) {
326 /* Tell AARP to probe a proposed address */
327 int ret = aarp_proxy_probe_network(atif,
330 if (ret != -EADDRINUSE)
335 if (probe_net > ntohs(atif->nets.nr_lastnet))
336 probe_net = ntohs(atif->nets.nr_firstnet);
339 return -EADDRINUSE; /* Network is full... */
343 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
345 struct atalk_iface *iface = dev->atalk_ptr;
346 return iface ? &iface->address : NULL;
349 static struct atalk_addr *atalk_find_primary(void)
351 struct atalk_iface *fiface = NULL;
352 struct atalk_addr *retval;
353 struct atalk_iface *iface;
356 * Return a point-to-point interface only if
357 * there is no non-ptp interface available.
359 read_lock_bh(&atalk_interfaces_lock);
360 for (iface = atalk_interfaces; iface; iface = iface->next) {
361 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
363 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
364 retval = &iface->address;
370 retval = &fiface->address;
371 else if (atalk_interfaces)
372 retval = &atalk_interfaces->address;
376 read_unlock_bh(&atalk_interfaces_lock);
381 * Find a match for 'any network' - ie any of our interfaces with that
382 * node number will do just nicely.
384 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
386 struct atalk_iface *iface = dev->atalk_ptr;
388 if (!iface || iface->status & ATIF_PROBE)
391 if (node != ATADDR_BCAST &&
392 iface->address.s_node != node &&
393 node != ATADDR_ANYNODE)
402 /* Find a match for a specific network:node pair */
403 static struct atalk_iface *atalk_find_interface(int net, int node)
405 struct atalk_iface *iface;
407 read_lock_bh(&atalk_interfaces_lock);
408 for (iface = atalk_interfaces; iface; iface = iface->next) {
409 if ((node == ATADDR_BCAST ||
410 node == ATADDR_ANYNODE ||
411 iface->address.s_node == node) &&
412 iface->address.s_net == net &&
413 !(iface->status & ATIF_PROBE))
416 /* XXXX.0 -- net.0 returns the iface associated with net */
417 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
418 ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
419 ntohs(net) <= ntohs(iface->nets.nr_lastnet))
422 read_unlock_bh(&atalk_interfaces_lock);
428 * Find a route for an AppleTalk packet. This ought to get cached in
429 * the socket (later on...). We know about host routes and the fact
430 * that a route must be direct to broadcast.
432 static struct atalk_route *atrtr_find(struct atalk_addr *target)
435 * we must search through all routes unless we find a
436 * host route, because some host routes might overlap
439 struct atalk_route *net_route = NULL;
440 struct atalk_route *r;
442 read_lock_bh(&atalk_routes_lock);
443 for (r = atalk_routes; r; r = r->next) {
444 if (!(r->flags & RTF_UP))
447 if (r->target.s_net == target->s_net) {
448 if (r->flags & RTF_HOST) {
450 * if this host route is for the target,
453 if (r->target.s_node == target->s_node)
457 * this route will work if there isn't a
458 * direct host route, so cache it
465 * if we found a network route but not a direct host
466 * route, then return it
470 else if (atrtr_default.dev)
472 else /* No route can be found */
475 read_unlock_bh(&atalk_routes_lock);
481 * Given an AppleTalk network, find the device to use. This can be
484 struct net_device *atrtr_get_dev(struct atalk_addr *sa)
486 struct atalk_route *atr = atrtr_find(sa);
487 return atr ? atr->dev : NULL;
490 /* Set up a default router */
491 static void atrtr_set_default(struct net_device *dev)
493 atrtr_default.dev = dev;
494 atrtr_default.flags = RTF_UP;
495 atrtr_default.gateway.s_net = htons(0);
496 atrtr_default.gateway.s_node = 0;
500 * Add a router. Basically make sure it looks valid and stuff the
501 * entry in the list. While it uses netranges we always set them to one
502 * entry to work like netatalk.
504 static int atrtr_create(struct rtentry *r, struct net_device *devhint)
506 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
507 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
508 struct atalk_route *rt;
509 struct atalk_iface *iface, *riface;
510 int retval = -EINVAL;
513 * Fixme: Raise/Lower a routing change semaphore for these
517 /* Validate the request */
518 if (ta->sat_family != AF_APPLETALK ||
519 (!devhint && ga->sat_family != AF_APPLETALK))
522 /* Now walk the routing table and make our decisions */
523 write_lock_bh(&atalk_routes_lock);
524 for (rt = atalk_routes; rt; rt = rt->next) {
525 if (r->rt_flags != rt->flags)
528 if (ta->sat_addr.s_net == rt->target.s_net) {
529 if (!(rt->flags & RTF_HOST))
531 if (ta->sat_addr.s_node == rt->target.s_node)
539 read_lock_bh(&atalk_interfaces_lock);
540 for (iface = atalk_interfaces; iface; iface = iface->next) {
542 ntohs(ga->sat_addr.s_net) >=
543 ntohs(iface->nets.nr_firstnet) &&
544 ntohs(ga->sat_addr.s_net) <=
545 ntohs(iface->nets.nr_lastnet))
548 if (ga->sat_addr.s_net == iface->address.s_net &&
549 ga->sat_addr.s_node == iface->address.s_node)
552 read_unlock_bh(&atalk_interfaces_lock);
554 retval = -ENETUNREACH;
558 devhint = riface->dev;
562 rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
567 memset(rt, 0, sizeof(*rt));
569 rt->next = atalk_routes;
573 /* Fill in the routing entry */
574 rt->target = ta->sat_addr;
576 rt->flags = r->rt_flags;
577 rt->gateway = ga->sat_addr;
581 write_unlock_bh(&atalk_routes_lock);
586 /* Delete a route. Find it and discard it */
587 static int atrtr_delete(struct atalk_addr * addr)
589 struct atalk_route **r = &atalk_routes;
591 struct atalk_route *tmp;
593 write_lock_bh(&atalk_routes_lock);
594 while ((tmp = *r) != NULL) {
595 if (tmp->target.s_net == addr->s_net &&
596 (!(tmp->flags&RTF_GATEWAY) ||
597 tmp->target.s_node == addr->s_node)) {
607 write_unlock_bh(&atalk_routes_lock);
612 * Called when a device is downed. Just throw away any routes
615 void atrtr_device_down(struct net_device *dev)
617 struct atalk_route **r = &atalk_routes;
618 struct atalk_route *tmp;
620 write_lock_bh(&atalk_routes_lock);
621 while ((tmp = *r) != NULL) {
622 if (tmp->dev == dev) {
629 write_unlock_bh(&atalk_routes_lock);
631 if (atrtr_default.dev == dev)
632 atrtr_set_default(NULL);
635 /* Actually down the interface */
636 static inline void atalk_dev_down(struct net_device *dev)
638 atrtr_device_down(dev); /* Remove all routes for the device */
639 aarp_device_down(dev); /* Remove AARP entries for the device */
640 atif_drop_device(dev); /* Remove the device */
644 * A device event has occurred. Watch for devices going down and
645 * delete our use of them (iface and route).
647 static int ddp_device_event(struct notifier_block *this, unsigned long event,
650 if (event == NETDEV_DOWN)
651 /* Discard any use of this */
657 /* ioctl calls. Shouldn't even need touching */
658 /* Device configuration ioctl calls */
659 static int atif_ioctl(int cmd, void __user *arg)
661 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
663 struct atalk_netrange *nr;
664 struct sockaddr_at *sa;
665 struct net_device *dev;
666 struct atalk_iface *atif;
669 struct rtentry rtdef;
672 if (copy_from_user(&atreq, arg, sizeof(atreq)))
675 dev = __dev_get_by_name(atreq.ifr_name);
679 sa = (struct sockaddr_at *)&atreq.ifr_addr;
680 atif = atalk_find_dev(dev);
684 if (!capable(CAP_NET_ADMIN))
686 if (sa->sat_family != AF_APPLETALK)
688 if (dev->type != ARPHRD_ETHER &&
689 dev->type != ARPHRD_LOOPBACK &&
690 dev->type != ARPHRD_LOCALTLK &&
691 dev->type != ARPHRD_PPP)
692 return -EPROTONOSUPPORT;
694 nr = (struct atalk_netrange *)&sa->sat_zero[0];
698 * if this is a point-to-point iface, and we already
699 * have an iface for this AppleTalk address, then we
700 * should not add a route
702 if ((dev->flags & IFF_POINTOPOINT) &&
703 atalk_find_interface(sa->sat_addr.s_net,
704 sa->sat_addr.s_node)) {
705 printk(KERN_DEBUG "AppleTalk: point-to-point "
706 "interface added with "
707 "existing address\n");
712 * Phase 1 is fine on LocalTalk but we don't do
713 * EtherTalk phase 1. Anyone wanting to add it go ahead.
715 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
716 return -EPROTONOSUPPORT;
717 if (sa->sat_addr.s_node == ATADDR_BCAST ||
718 sa->sat_addr.s_node == 254)
721 /* Already setting address */
722 if (atif->status & ATIF_PROBE)
725 atif->address.s_net = sa->sat_addr.s_net;
726 atif->address.s_node = sa->sat_addr.s_node;
727 atrtr_device_down(dev); /* Flush old routes */
729 atif = atif_add_device(dev, &sa->sat_addr);
736 * Check if the chosen address is used. If so we
737 * error and atalkd will try another.
740 if (!(dev->flags & IFF_LOOPBACK) &&
741 !(dev->flags & IFF_POINTOPOINT) &&
742 atif_probe_device(atif) < 0) {
743 atif_drop_device(dev);
747 /* Hey it worked - add the direct routes */
748 sa = (struct sockaddr_at *)&rtdef.rt_gateway;
749 sa->sat_family = AF_APPLETALK;
750 sa->sat_addr.s_net = atif->address.s_net;
751 sa->sat_addr.s_node = atif->address.s_node;
752 sa = (struct sockaddr_at *)&rtdef.rt_dst;
753 rtdef.rt_flags = RTF_UP;
754 sa->sat_family = AF_APPLETALK;
755 sa->sat_addr.s_node = ATADDR_ANYNODE;
756 if (dev->flags & IFF_LOOPBACK ||
757 dev->flags & IFF_POINTOPOINT)
758 rtdef.rt_flags |= RTF_HOST;
760 /* Routerless initial state */
761 if (nr->nr_firstnet == htons(0) &&
762 nr->nr_lastnet == htons(0xFFFE)) {
763 sa->sat_addr.s_net = atif->address.s_net;
764 atrtr_create(&rtdef, dev);
765 atrtr_set_default(dev);
767 limit = ntohs(nr->nr_lastnet);
768 if (limit - ntohs(nr->nr_firstnet) > 4096) {
769 printk(KERN_WARNING "Too many routes/"
774 for (ct = ntohs(nr->nr_firstnet);
776 sa->sat_addr.s_net = htons(ct);
777 atrtr_create(&rtdef, dev);
780 dev_mc_add(dev, aarp_mcast, 6, 1);
785 return -EADDRNOTAVAIL;
787 sa->sat_family = AF_APPLETALK;
788 sa->sat_addr = atif->address;
793 return -EADDRNOTAVAIL;
795 sa->sat_family = AF_APPLETALK;
796 sa->sat_addr.s_net = atif->address.s_net;
797 sa->sat_addr.s_node = ATADDR_BCAST;
800 case SIOCATALKDIFADDR:
802 if (!capable(CAP_NET_ADMIN))
804 if (sa->sat_family != AF_APPLETALK)
810 if (!capable(CAP_NET_ADMIN))
812 if (sa->sat_family != AF_APPLETALK)
815 return -EADDRNOTAVAIL;
818 * for now, we only support proxy AARP on ELAP;
819 * we should be able to do it for LocalTalk, too.
821 if (dev->type != ARPHRD_ETHER)
822 return -EPROTONOSUPPORT;
825 * atif points to the current interface on this network;
826 * we aren't concerned about its current status (at
827 * least for now), but it has all the settings about
828 * the network we're going to probe. Consequently, it
832 return -EADDRNOTAVAIL;
834 nr = (struct atalk_netrange *)&(atif->nets);
836 * Phase 1 is fine on Localtalk but we don't do
837 * Ethertalk phase 1. Anyone wanting to add it go ahead.
839 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
840 return -EPROTONOSUPPORT;
842 if (sa->sat_addr.s_node == ATADDR_BCAST ||
843 sa->sat_addr.s_node == 254)
847 * Check if the chosen address is used. If so we
848 * error and ATCP will try another.
850 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
854 * We now have an address on the local network, and
855 * the AARP code will defend it for us until we take it
856 * down. We don't set up any routes right now, because
857 * ATCP will install them manually via SIOCADDRT.
862 if (!capable(CAP_NET_ADMIN))
864 if (sa->sat_family != AF_APPLETALK)
867 return -EADDRNOTAVAIL;
869 /* give to aarp module to remove proxy entry */
870 aarp_proxy_remove(atif->dev, &(sa->sat_addr));
874 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
877 /* Routing ioctl() calls */
878 static int atrtr_ioctl(unsigned int cmd, void __user *arg)
882 if (copy_from_user(&rt, arg, sizeof(rt)))
887 if (rt.rt_dst.sa_family != AF_APPLETALK)
889 return atrtr_delete(&((struct sockaddr_at *)
890 &rt.rt_dst)->sat_addr);
893 struct net_device *dev = NULL;
896 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
898 name[IFNAMSIZ-1] = '\0';
899 dev = __dev_get_by_name(name);
903 return atrtr_create(&rt, dev);
909 /**************************************************************************\
911 * Handling for system calls applied via the various interfaces to an *
912 * AppleTalk socket object. *
914 \**************************************************************************/
917 * Checksum: This is 'optional'. It's quite likely also a good
918 * candidate for assembler hackery 8)
920 static unsigned long atalk_sum_partial(const unsigned char *data,
921 int len, unsigned long sum)
923 /* This ought to be unwrapped neatly. I'll trust gcc for now */
936 /* Checksum skb data -- similar to skb_checksum */
937 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
938 int len, unsigned long sum)
940 int start = skb_headlen(skb);
943 /* checksum stuff in header space */
944 if ( (copy = start - offset) > 0) {
947 sum = atalk_sum_partial(skb->data + offset, copy, sum);
948 if ( (len -= copy) == 0)
954 /* checksum stuff in frags */
955 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
958 BUG_TRAP(start <= offset + len);
960 end = start + skb_shinfo(skb)->frags[i].size;
961 if ((copy = end - offset) > 0) {
963 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
967 vaddr = kmap_skb_frag(frag);
968 sum = atalk_sum_partial(vaddr + frag->page_offset +
969 offset - start, copy, sum);
970 kunmap_skb_frag(vaddr);
979 if (skb_shinfo(skb)->frag_list) {
980 struct sk_buff *list = skb_shinfo(skb)->frag_list;
982 for (; list; list = list->next) {
985 BUG_TRAP(start <= offset + len);
987 end = start + list->len;
988 if ((copy = end - offset) > 0) {
991 sum = atalk_sum_skb(list, offset - start,
993 if ((len -= copy) == 0)
1006 static unsigned short atalk_checksum(const struct sk_buff *skb, int len)
1010 /* skip header 4 bytes */
1011 sum = atalk_sum_skb(skb, 4, len-4, 0);
1013 /* Use 0xFFFF for 0. 0 itself means none */
1014 return sum ? htons((unsigned short)sum) : 0xFFFF;
1018 * Create a socket. Initialise the socket, blank the addresses
1021 static int atalk_create(struct socket *sock, int protocol)
1024 struct atalk_sock *at;
1025 int rc = -ESOCKTNOSUPPORT;
1028 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
1029 * and gives you the full ELAP frame. Should be handy for CAP 8)
1031 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
1034 sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, 1, NULL);
1037 at = sk->sk_protinfo = kmalloc(sizeof(*at), GFP_KERNEL);
1040 memset(at, 0, sizeof(*at));
1042 sock->ops = &atalk_dgram_ops;
1043 sock_init_data(sock, sk);
1044 sk_set_owner(sk, THIS_MODULE);
1046 /* Checksums on by default */
1055 /* Free a socket. No work needed */
1056 static int atalk_release(struct socket *sock)
1058 struct sock *sk = sock->sk;
1063 atalk_destroy_socket(sk);
1069 * atalk_pick_and_bind_port - Pick a source port when one is not given
1070 * @sk - socket to insert into the tables
1071 * @sat - address to search for
1073 * Pick a source port when one is not given. If we can find a suitable free
1074 * one, we insert the socket into the tables using it.
1076 * This whole operation must be atomic.
1078 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1082 write_lock_bh(&atalk_sockets_lock);
1084 for (sat->sat_port = ATPORT_RESERVED;
1085 sat->sat_port < ATPORT_LAST;
1088 struct hlist_node *node;
1090 sk_for_each(s, node, &atalk_sockets) {
1091 struct atalk_sock *at = at_sk(s);
1093 if (at->src_net == sat->sat_addr.s_net &&
1094 at->src_node == sat->sat_addr.s_node &&
1095 at->src_port == sat->sat_port)
1099 /* Wheee, it's free, assign and insert. */
1100 __atalk_insert_socket(sk);
1101 at_sk(sk)->src_port = sat->sat_port;
1110 write_unlock_bh(&atalk_sockets_lock);
1114 static int atalk_autobind(struct sock *sk)
1116 struct atalk_sock *at = at_sk(sk);
1117 struct sockaddr_at sat;
1118 struct atalk_addr *ap = atalk_find_primary();
1119 int n = -EADDRNOTAVAIL;
1121 if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1124 at->src_net = sat.sat_addr.s_net = ap->s_net;
1125 at->src_node = sat.sat_addr.s_node = ap->s_node;
1127 n = atalk_pick_and_bind_port(sk, &sat);
1134 /* Set the address 'our end' of the connection */
1135 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1137 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1138 struct sock *sk = sock->sk;
1139 struct atalk_sock *at = at_sk(sk);
1141 if (!sk->sk_zapped || addr_len != sizeof(struct sockaddr_at))
1144 if (addr->sat_family != AF_APPLETALK)
1145 return -EAFNOSUPPORT;
1147 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1148 struct atalk_addr *ap = atalk_find_primary();
1151 return -EADDRNOTAVAIL;
1153 at->src_net = addr->sat_addr.s_net = ap->s_net;
1154 at->src_node = addr->sat_addr.s_node= ap->s_node;
1156 if (!atalk_find_interface(addr->sat_addr.s_net,
1157 addr->sat_addr.s_node))
1158 return -EADDRNOTAVAIL;
1160 at->src_net = addr->sat_addr.s_net;
1161 at->src_node = addr->sat_addr.s_node;
1164 if (addr->sat_port == ATADDR_ANYPORT) {
1165 int n = atalk_pick_and_bind_port(sk, addr);
1170 at->src_port = addr->sat_port;
1172 if (atalk_find_or_insert_socket(sk, addr))
1180 /* Set the address we talk to */
1181 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1182 int addr_len, int flags)
1184 struct sock *sk = sock->sk;
1185 struct atalk_sock *at = at_sk(sk);
1186 struct sockaddr_at *addr;
1188 sk->sk_state = TCP_CLOSE;
1189 sock->state = SS_UNCONNECTED;
1191 if (addr_len != sizeof(*addr))
1194 addr = (struct sockaddr_at *)uaddr;
1196 if (addr->sat_family != AF_APPLETALK)
1197 return -EAFNOSUPPORT;
1199 if (addr->sat_addr.s_node == ATADDR_BCAST &&
1200 !sock_flag(sk, SOCK_BROADCAST)) {
1202 printk(KERN_WARNING "%s is broken and did not set "
1203 "SO_BROADCAST. It will break when 2.2 is "
1212 if (atalk_autobind(sk) < 0)
1215 if (!atrtr_get_dev(&addr->sat_addr))
1216 return -ENETUNREACH;
1218 at->dest_port = addr->sat_port;
1219 at->dest_net = addr->sat_addr.s_net;
1220 at->dest_node = addr->sat_addr.s_node;
1222 sock->state = SS_CONNECTED;
1223 sk->sk_state = TCP_ESTABLISHED;
1228 * Find the name of an AppleTalk socket. Just copy the right
1229 * fields into the sockaddr.
1231 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1232 int *uaddr_len, int peer)
1234 struct sockaddr_at sat;
1235 struct sock *sk = sock->sk;
1236 struct atalk_sock *at = at_sk(sk);
1239 if (atalk_autobind(sk) < 0)
1242 *uaddr_len = sizeof(struct sockaddr_at);
1245 if (sk->sk_state != TCP_ESTABLISHED)
1248 sat.sat_addr.s_net = at->dest_net;
1249 sat.sat_addr.s_node = at->dest_node;
1250 sat.sat_port = at->dest_port;
1252 sat.sat_addr.s_net = at->src_net;
1253 sat.sat_addr.s_node = at->src_node;
1254 sat.sat_port = at->src_port;
1257 sat.sat_family = AF_APPLETALK;
1258 memcpy(uaddr, &sat, sizeof(sat));
1262 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1263 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1265 return skb->data[12] == 22;
1268 static int handle_ip_over_ddp(struct sk_buff *skb)
1270 struct net_device *dev = __dev_get_by_name("ipddp0");
1271 struct net_device_stats *stats;
1273 /* This needs to be able to handle ipddp"N" devices */
1277 skb->protocol = htons(ETH_P_IP);
1280 skb->h.raw = skb->data;
1283 stats->rx_packets++;
1284 stats->rx_bytes += skb->len + 13;
1285 netif_rx(skb); /* Send the SKB up to a higher place. */
1289 /* make it easy for gcc to optimize this test out, i.e. kill the code */
1290 #define is_ip_over_ddp(skb) 0
1291 #define handle_ip_over_ddp(skb) 0
1294 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1295 struct ddpehdr *ddp, struct ddpebits *ddphv,
1298 struct atalk_route *rt;
1299 struct atalk_addr ta;
1302 * Don't route multicast, etc., packets, or packets sent to "this
1305 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1309 * Can it ever happen that a packet is from a PPP iface and
1310 * needs to be broadcast onto the default network?
1312 if (dev->type == ARPHRD_PPP)
1313 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1314 "packet received from PPP iface\n");
1318 ta.s_net = ddp->deh_dnet;
1319 ta.s_node = ddp->deh_dnode;
1321 /* Route the packet */
1322 rt = atrtr_find(&ta);
1323 if (!rt || ddphv->deh_hops == DDP_MAXHOPS)
1325 /* FIXME: use skb->cb to be able to use shared skbs */
1329 * Route goes through another gateway, so set the target to the
1333 if (rt->flags & RTF_GATEWAY) {
1334 ta.s_net = rt->gateway.s_net;
1335 ta.s_node = rt->gateway.s_node;
1338 /* Fix up skb->len field */
1339 skb_trim(skb, min_t(unsigned int, origlen,
1340 (rt->dev->hard_header_len +
1341 ddp_dl->header_length + ddphv->deh_len)));
1343 /* Mend the byte order */
1344 /* FIXME: use skb->cb to be able to use shared skbs */
1345 *((__u16 *)ddp) = ntohs(*((__u16 *)ddphv));
1348 * Send the buffer onwards
1350 * Now we must always be careful. If it's come from LocalTalk to
1351 * EtherTalk it might not fit
1353 * Order matters here: If a packet has to be copied to make a new
1354 * headroom (rare hopefully) then it won't need unsharing.
1356 * Note. ddp-> becomes invalid at the realloc.
1358 if (skb_headroom(skb) < 22) {
1359 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1360 struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1366 skb = skb_unshare(skb, GFP_ATOMIC);
1369 * If the buffer didn't vanish into the lack of space bitbucket we can
1372 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
1381 * atalk_rcv - Receive a packet (in skb) from device dev
1382 * @skb - packet received
1383 * @dev - network device where the packet comes from
1386 * Receive a packet (in skb) from device dev. This has come from the SNAP
1387 * decoder, and on entry skb->h.raw is the DDP header, skb->len is the DDP
1388 * header, skb->len is the DDP length. The physical headers have been
1389 * extracted. PPP should probably pass frames marked as for this layer.
1390 * [ie ARPHRD_ETHERTALK]
1392 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1393 struct packet_type *pt)
1395 struct ddpehdr *ddp;
1397 struct atalk_iface *atif;
1398 struct sockaddr_at tosat;
1400 struct ddpebits ddphv;
1402 /* Don't mangle buffer if shared */
1403 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1406 /* Size check and make sure header is contiguous */
1407 if (!pskb_may_pull(skb, sizeof(*ddp)))
1413 * Fix up the length field [Ok this is horrible but otherwise
1414 * I end up with unions of bit fields and messy bit field order
1415 * compiler/endian dependencies..]
1417 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1419 /* Trim buffer in case of stray trailing data */
1421 skb_trim(skb, min_t(unsigned int, skb->len, ddphv.deh_len));
1424 * Size check to see if ddp->deh_len was crap
1425 * (Otherwise we'll detonate most spectacularly
1426 * in the middle of recvmsg()).
1428 if (skb->len < sizeof(*ddp))
1432 * Any checksums. Note we don't do htons() on this == is assumed to be
1433 * valid for net byte orders all over the networking code...
1436 atalk_checksum(skb, ddphv.deh_len) != ddp->deh_sum)
1437 /* Not a valid AppleTalk frame - dustbin time */
1440 /* Check the packet is aimed at us */
1441 if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1442 atif = atalk_find_anynet(ddp->deh_dnode, dev);
1444 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1446 /* Not ours, so we route the packet via the correct AppleTalk iface */
1448 atalk_route_packet(skb, dev, ddp, &ddphv, origlen);
1452 /* if IP over DDP is not selected this code will be optimized out */
1453 if (is_ip_over_ddp(skb))
1454 return handle_ip_over_ddp(skb);
1456 * Which socket - atalk_search_socket() looks for a *full match*
1457 * of the <net, node, port> tuple.
1459 tosat.sat_addr.s_net = ddp->deh_dnet;
1460 tosat.sat_addr.s_node = ddp->deh_dnode;
1461 tosat.sat_port = ddp->deh_dport;
1463 sock = atalk_search_socket(&tosat, atif);
1464 if (!sock) /* But not one of our sockets */
1467 /* Queue packet (standard) */
1470 if (sock_queue_rcv_skb(sock, skb) < 0)
1480 * Receive a LocalTalk frame. We make some demands on the caller here.
1481 * Caller must provide enough headroom on the packet to pull the short
1482 * header and append a long one.
1484 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1485 struct packet_type *pt)
1487 /* Expand any short form frames */
1488 if (skb->mac.raw[2] == 1) {
1489 struct ddpehdr *ddp;
1490 /* Find our address */
1491 struct atalk_addr *ap = atalk_find_dev_addr(dev);
1493 if (!ap || skb->len < sizeof(struct ddpshdr))
1496 /* Don't mangle buffer if shared */
1497 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1501 * The push leaves us with a ddephdr not an shdr, and
1502 * handily the port bytes in the right place preset.
1504 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1506 /* Now fill in the long header */
1509 * These two first. The mac overlays the new source/dest
1510 * network information so we MUST copy these before
1511 * we write the network numbers !
1514 ddp->deh_dnode = skb->mac.raw[0]; /* From physical header */
1515 ddp->deh_snode = skb->mac.raw[1]; /* From physical header */
1517 ddp->deh_dnet = ap->s_net; /* Network number */
1518 ddp->deh_snet = ap->s_net;
1519 ddp->deh_sum = 0; /* No checksum */
1521 * Not sure about this bit...
1523 ddp->deh_len = skb->len;
1524 ddp->deh_hops = DDP_MAXHOPS; /* Non routable, so force a drop
1525 if we slip up later */
1526 /* Mend the byte order */
1527 *((__u16 *)ddp) = htons(*((__u16 *)ddp));
1529 skb->h.raw = skb->data;
1531 return atalk_rcv(skb, dev, pt);
1537 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1540 struct sock *sk = sock->sk;
1541 struct atalk_sock *at = at_sk(sk);
1542 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1543 int flags = msg->msg_flags;
1545 struct sockaddr_at local_satalk, gsat;
1546 struct sk_buff *skb;
1547 struct net_device *dev;
1548 struct ddpehdr *ddp;
1550 struct atalk_route *rt;
1553 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1556 if (len > DDP_MAXSZ)
1561 if (atalk_autobind(sk) < 0)
1564 if (msg->msg_namelen < sizeof(*usat) ||
1565 usat->sat_family != AF_APPLETALK)
1568 /* netatalk doesn't implement this check */
1569 if (usat->sat_addr.s_node == ATADDR_BCAST &&
1570 !sock_flag(sk, SOCK_BROADCAST)) {
1571 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
1572 "it will break before 2.2\n");
1578 if (sk->sk_state != TCP_ESTABLISHED)
1580 usat = &local_satalk;
1581 usat->sat_family = AF_APPLETALK;
1582 usat->sat_port = at->dest_port;
1583 usat->sat_addr.s_node = at->dest_node;
1584 usat->sat_addr.s_net = at->dest_net;
1587 /* Build a packet */
1588 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1591 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1593 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1594 rt = atrtr_find(&usat->sat_addr);
1596 return -ENETUNREACH;
1600 struct atalk_addr at_hint;
1603 at_hint.s_net = at->src_net;
1605 rt = atrtr_find(&at_hint);
1607 return -ENETUNREACH;
1612 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1613 sk, size, dev->name);
1615 size += dev->hard_header_len;
1616 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1621 skb_reserve(skb, ddp_dl->header_length);
1622 skb_reserve(skb, dev->hard_header_len);
1625 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1627 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1630 ddp->deh_len = len + sizeof(*ddp);
1632 * Fix up the length field [Ok this is horrible but otherwise
1633 * I end up with unions of bit fields and messy bit field order
1634 * compiler/endian dependencies..
1636 *((__u16 *)ddp) = ntohs(*((__u16 *)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 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1647 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1653 if (sk->sk_no_check == 1)
1656 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1659 * Loopback broadcast packets to non gateway targets (ie routes
1660 * to group we are in)
1662 if (ddp->deh_dnode == ATADDR_BCAST &&
1663 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1664 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1668 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1669 if (aarp_send_ddp(dev, skb2,
1670 &usat->sat_addr, NULL) == -1)
1672 /* else queued/sent above in the aarp queue */
1676 if (dev->flags & IFF_LOOPBACK || loopback) {
1677 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1680 ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1682 SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1683 if (rt->flags & RTF_GATEWAY) {
1684 gsat.sat_addr = rt->gateway;
1688 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
1690 /* else queued/sent above in the aarp queue */
1692 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1697 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1698 size_t size, int flags)
1700 struct sock *sk = sock->sk;
1701 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1702 struct ddpehdr *ddp;
1705 struct ddpebits ddphv;
1706 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1707 flags & MSG_DONTWAIT, &err);
1711 /* FIXME: use skb->cb to be able to use shared skbs */
1713 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
1715 if (sk->sk_type == SOCK_RAW) {
1716 copied = ddphv.deh_len;
1717 if (copied > size) {
1719 msg->msg_flags |= MSG_TRUNC;
1722 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1724 copied = ddphv.deh_len - sizeof(*ddp);
1725 if (copied > size) {
1727 msg->msg_flags |= MSG_TRUNC;
1729 err = skb_copy_datagram_iovec(skb, sizeof(*ddp),
1730 msg->msg_iov, copied);
1735 sat->sat_family = AF_APPLETALK;
1736 sat->sat_port = ddp->deh_sport;
1737 sat->sat_addr.s_node = ddp->deh_snode;
1738 sat->sat_addr.s_net = ddp->deh_snet;
1740 msg->msg_namelen = sizeof(*sat);
1743 skb_free_datagram(sk, skb); /* Free the datagram. */
1744 return err ? : copied;
1749 * AppleTalk ioctl calls.
1751 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1754 struct sock *sk = sock->sk;
1755 void __user *argp = (void __user *)arg;
1758 /* Protocol layer */
1760 long amount = sk->sk_sndbuf -
1761 atomic_read(&sk->sk_wmem_alloc);
1765 rc = put_user(amount, (int __user *)argp);
1770 * These two are safe on a single CPU system as only
1771 * user tasks fiddle here
1773 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1777 amount = skb->len - sizeof(struct ddpehdr);
1778 rc = put_user(amount, (int __user *)argp);
1782 rc = sock_get_timestamp(sk, argp);
1788 if (capable(CAP_NET_ADMIN))
1789 rc = atrtr_ioctl(cmd, argp);
1794 case SIOCGIFBRDADDR:
1795 case SIOCATALKDIFADDR:
1797 case SIOCSARP: /* proxy AARP */
1798 case SIOCDARP: /* proxy AARP */
1800 rc = atif_ioctl(cmd, argp);
1803 /* Physical layer ioctl calls */
1816 rc = dev_ioctl(cmd, argp);
1823 static struct net_proto_family atalk_family_ops = {
1824 .family = PF_APPLETALK,
1825 .create = atalk_create,
1826 .owner = THIS_MODULE,
1829 static struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1830 .family = PF_APPLETALK,
1831 .owner = THIS_MODULE,
1832 .release = atalk_release,
1834 .connect = atalk_connect,
1835 .socketpair = sock_no_socketpair,
1836 .accept = sock_no_accept,
1837 .getname = atalk_getname,
1838 .poll = datagram_poll,
1839 .ioctl = atalk_ioctl,
1840 .listen = sock_no_listen,
1841 .shutdown = sock_no_shutdown,
1842 .setsockopt = sock_no_setsockopt,
1843 .getsockopt = sock_no_getsockopt,
1844 .sendmsg = atalk_sendmsg,
1845 .recvmsg = atalk_recvmsg,
1846 .mmap = sock_no_mmap,
1847 .sendpage = sock_no_sendpage,
1850 #include <linux/smp_lock.h>
1851 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
1853 static struct notifier_block ddp_notifier = {
1854 .notifier_call = ddp_device_event,
1857 struct packet_type ltalk_packet_type = {
1858 .type = __constant_htons(ETH_P_LOCALTALK),
1862 struct packet_type ppptalk_packet_type = {
1863 .type = __constant_htons(ETH_P_PPPTALK),
1867 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1869 /* Export symbols for use by drivers when AppleTalk is a module */
1870 EXPORT_SYMBOL(aarp_send_ddp);
1871 EXPORT_SYMBOL(atrtr_get_dev);
1872 EXPORT_SYMBOL(atalk_find_dev_addr);
1874 static char atalk_err_snap[] __initdata =
1875 KERN_CRIT "Unable to register DDP with SNAP.\n";
1877 /* Called by proto.c on kernel start up */
1878 static int __init atalk_init(void)
1880 (void)sock_register(&atalk_family_ops);
1881 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1883 printk(atalk_err_snap);
1885 dev_add_pack(<alk_packet_type);
1886 dev_add_pack(&ppptalk_packet_type);
1888 register_netdevice_notifier(&ddp_notifier);
1891 atalk_register_sysctl();
1894 module_init(atalk_init);
1897 * No explicit module reference count manipulation is needed in the
1898 * protocol. Socket layer sets module reference count for us
1899 * and interfaces reference counting is done
1900 * by the network device layer.
1902 * Ergo, before the AppleTalk module can be removed, all AppleTalk
1903 * sockets be closed from user space.
1905 static void __exit atalk_exit(void)
1907 #ifdef CONFIG_SYSCTL
1908 atalk_unregister_sysctl();
1909 #endif /* CONFIG_SYSCTL */
1911 aarp_cleanup_module(); /* General aarp clean-up. */
1912 unregister_netdevice_notifier(&ddp_notifier);
1913 dev_remove_pack(<alk_packet_type);
1914 dev_remove_pack(&ppptalk_packet_type);
1915 unregister_snap_client(ddp_dl);
1916 sock_unregister(PF_APPLETALK);
1918 module_exit(atalk_exit);
1920 MODULE_LICENSE("GPL");
1921 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>");
1922 MODULE_DESCRIPTION("AppleTalk 0.20\n");
1923 MODULE_ALIAS_NETPROTO(PF_APPLETALK);