2
* DDP: An implementation of the AppleTalk DDP protocol for
5
* Alan Cox <alan@lxorguk.ukuu.org.uk>
7
* With more than a little assistance from
9
* Wesley Craig <netatalk@umich.edu>
12
* Neil Horman : Added missing device ioctls
13
* Michael Callahan : Made routing work
14
* Wesley Craig : Fix probing to listen to a
16
* Alan Cox : Added send/recvmsg support
17
* Alan Cox : Moved at. to protinfo in
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
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
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
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,
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.
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>
63
#include <net/tcp_states.h>
64
#include <net/route.h>
65
#include <linux/atalk.h>
66
#include "../core/kmap_skb.h"
68
struct datalink_proto *ddp_dl, *aarp_dl;
69
static const struct proto_ops atalk_dgram_ops;
71
/**************************************************************************\
73
* Handlers for the socket list. *
75
\**************************************************************************/
77
HLIST_HEAD(atalk_sockets);
78
DEFINE_RWLOCK(atalk_sockets_lock);
80
static inline void __atalk_insert_socket(struct sock *sk)
82
sk_add_node(sk, &atalk_sockets);
85
static inline void atalk_remove_socket(struct sock *sk)
87
write_lock_bh(&atalk_sockets_lock);
89
write_unlock_bh(&atalk_sockets_lock);
92
static struct sock *atalk_search_socket(struct sockaddr_at *to,
93
struct atalk_iface *atif)
96
struct hlist_node *node;
98
read_lock_bh(&atalk_sockets_lock);
99
sk_for_each(s, node, &atalk_sockets) {
100
struct atalk_sock *at = at_sk(s);
102
if (to->sat_port != at->src_port)
105
if (to->sat_addr.s_net == ATADDR_ANYNET &&
106
to->sat_addr.s_node == ATADDR_BCAST)
109
if (to->sat_addr.s_net == at->src_net &&
110
(to->sat_addr.s_node == at->src_node ||
111
to->sat_addr.s_node == ATADDR_BCAST ||
112
to->sat_addr.s_node == ATADDR_ANYNODE))
115
/* XXXX.0 -- we got a request for this router. make sure
116
* that the node is appropriately set. */
117
if (to->sat_addr.s_node == ATADDR_ANYNODE &&
118
to->sat_addr.s_net != ATADDR_ANYNET &&
119
atif->address.s_node == at->src_node) {
120
to->sat_addr.s_node = atif->address.s_node;
126
read_unlock_bh(&atalk_sockets_lock);
131
* atalk_find_or_insert_socket - Try to find a socket matching ADDR
132
* @sk - socket to insert in the list if it is not there already
133
* @sat - address to search for
135
* Try to find a socket matching ADDR in the socket list, if found then return
136
* it. If not, insert SK into the socket list.
138
* This entire operation must execute atomically.
140
static struct sock *atalk_find_or_insert_socket(struct sock *sk,
141
struct sockaddr_at *sat)
144
struct hlist_node *node;
145
struct atalk_sock *at;
147
write_lock_bh(&atalk_sockets_lock);
148
sk_for_each(s, node, &atalk_sockets) {
151
if (at->src_net == sat->sat_addr.s_net &&
152
at->src_node == sat->sat_addr.s_node &&
153
at->src_port == sat->sat_port)
157
__atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
159
write_unlock_bh(&atalk_sockets_lock);
163
static void atalk_destroy_timer(unsigned long data)
165
struct sock *sk = (struct sock *)data;
167
if (sk_has_allocations(sk)) {
168
sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
169
add_timer(&sk->sk_timer);
174
static inline void atalk_destroy_socket(struct sock *sk)
176
atalk_remove_socket(sk);
177
skb_queue_purge(&sk->sk_receive_queue);
179
if (sk_has_allocations(sk)) {
180
setup_timer(&sk->sk_timer, atalk_destroy_timer,
182
sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
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
DEFINE_RWLOCK(atalk_routes_lock);
198
struct atalk_iface *atalk_interfaces;
199
DEFINE_RWLOCK(atalk_interfaces_lock);
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 = kzalloc(sizeof(*iface), GFP_KERNEL);
237
dev->atalk_ptr = iface;
238
iface->address = *sa;
241
write_lock_bh(&atalk_interfaces_lock);
242
iface->next = atalk_interfaces;
243
atalk_interfaces = iface;
244
write_unlock_bh(&atalk_interfaces_lock);
249
/* Perform phase 2 AARP probing on our tentative address */
250
static int atif_probe_device(struct atalk_iface *atif)
252
int netrange = ntohs(atif->nets.nr_lastnet) -
253
ntohs(atif->nets.nr_firstnet) + 1;
254
int probe_net = ntohs(atif->address.s_net);
255
int probe_node = atif->address.s_node;
258
/* Offset the network we start probing with */
259
if (probe_net == ATADDR_ANYNET) {
260
probe_net = ntohs(atif->nets.nr_firstnet);
262
probe_net += jiffies % netrange;
264
if (probe_node == ATADDR_ANYNODE)
265
probe_node = jiffies & 0xFF;
267
/* Scan the networks */
268
atif->status |= ATIF_PROBE;
269
for (netct = 0; netct <= netrange; netct++) {
270
/* Sweep the available nodes from a given start */
271
atif->address.s_net = htons(probe_net);
272
for (nodect = 0; nodect < 256; nodect++) {
273
atif->address.s_node = (nodect + probe_node) & 0xFF;
274
if (atif->address.s_node > 0 &&
275
atif->address.s_node < 254) {
276
/* Probe a proposed address */
277
aarp_probe_network(atif);
279
if (!(atif->status & ATIF_PROBE_FAIL)) {
280
atif->status &= ~ATIF_PROBE;
284
atif->status &= ~ATIF_PROBE_FAIL;
287
if (probe_net > ntohs(atif->nets.nr_lastnet))
288
probe_net = ntohs(atif->nets.nr_firstnet);
290
atif->status &= ~ATIF_PROBE;
292
return -EADDRINUSE; /* Network is full... */
296
/* Perform AARP probing for a proxy address */
297
static int atif_proxy_probe_device(struct atalk_iface *atif,
298
struct atalk_addr* proxy_addr)
300
int netrange = ntohs(atif->nets.nr_lastnet) -
301
ntohs(atif->nets.nr_firstnet) + 1;
302
/* we probe the interface's network */
303
int probe_net = ntohs(atif->address.s_net);
304
int probe_node = ATADDR_ANYNODE; /* we'll take anything */
307
/* Offset the network we start probing with */
308
if (probe_net == ATADDR_ANYNET) {
309
probe_net = ntohs(atif->nets.nr_firstnet);
311
probe_net += jiffies % netrange;
314
if (probe_node == ATADDR_ANYNODE)
315
probe_node = jiffies & 0xFF;
317
/* Scan the networks */
318
for (netct = 0; netct <= netrange; netct++) {
319
/* Sweep the available nodes from a given start */
320
proxy_addr->s_net = htons(probe_net);
321
for (nodect = 0; nodect < 256; nodect++) {
322
proxy_addr->s_node = (nodect + probe_node) & 0xFF;
323
if (proxy_addr->s_node > 0 &&
324
proxy_addr->s_node < 254) {
325
/* Tell AARP to probe a proposed address */
326
int ret = aarp_proxy_probe_network(atif,
329
if (ret != -EADDRINUSE)
334
if (probe_net > ntohs(atif->nets.nr_lastnet))
335
probe_net = ntohs(atif->nets.nr_firstnet);
338
return -EADDRINUSE; /* Network is full... */
342
struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
344
struct atalk_iface *iface = dev->atalk_ptr;
345
return iface ? &iface->address : NULL;
348
static struct atalk_addr *atalk_find_primary(void)
350
struct atalk_iface *fiface = NULL;
351
struct atalk_addr *retval;
352
struct atalk_iface *iface;
355
* Return a point-to-point interface only if
356
* there is no non-ptp interface available.
358
read_lock_bh(&atalk_interfaces_lock);
359
for (iface = atalk_interfaces; iface; iface = iface->next) {
360
if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
362
if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
363
retval = &iface->address;
369
retval = &fiface->address;
370
else if (atalk_interfaces)
371
retval = &atalk_interfaces->address;
375
read_unlock_bh(&atalk_interfaces_lock);
380
* Find a match for 'any network' - ie any of our interfaces with that
381
* node number will do just nicely.
383
static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
385
struct atalk_iface *iface = dev->atalk_ptr;
387
if (!iface || iface->status & ATIF_PROBE)
390
if (node != ATADDR_BCAST &&
391
iface->address.s_node != node &&
392
node != ATADDR_ANYNODE)
401
/* Find a match for a specific network:node pair */
402
static struct atalk_iface *atalk_find_interface(__be16 net, int node)
404
struct atalk_iface *iface;
406
read_lock_bh(&atalk_interfaces_lock);
407
for (iface = atalk_interfaces; iface; iface = iface->next) {
408
if ((node == ATADDR_BCAST ||
409
node == ATADDR_ANYNODE ||
410
iface->address.s_node == node) &&
411
iface->address.s_net == net &&
412
!(iface->status & ATIF_PROBE))
415
/* XXXX.0 -- net.0 returns the iface associated with net */
416
if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
417
ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
418
ntohs(net) <= ntohs(iface->nets.nr_lastnet))
421
read_unlock_bh(&atalk_interfaces_lock);
427
* Find a route for an AppleTalk packet. This ought to get cached in
428
* the socket (later on...). We know about host routes and the fact
429
* that a route must be direct to broadcast.
431
static struct atalk_route *atrtr_find(struct atalk_addr *target)
434
* we must search through all routes unless we find a
435
* host route, because some host routes might overlap
438
struct atalk_route *net_route = NULL;
439
struct atalk_route *r;
441
read_lock_bh(&atalk_routes_lock);
442
for (r = atalk_routes; r; r = r->next) {
443
if (!(r->flags & RTF_UP))
446
if (r->target.s_net == target->s_net) {
447
if (r->flags & RTF_HOST) {
449
* if this host route is for the target,
452
if (r->target.s_node == target->s_node)
456
* this route will work if there isn't a
457
* direct host route, so cache it
464
* if we found a network route but not a direct host
465
* route, then return it
469
else if (atrtr_default.dev)
471
else /* No route can be found */
474
read_unlock_bh(&atalk_routes_lock);
480
* Given an AppleTalk network, find the device to use. This can be
483
struct net_device *atrtr_get_dev(struct atalk_addr *sa)
485
struct atalk_route *atr = atrtr_find(sa);
486
return atr ? atr->dev : NULL;
489
/* Set up a default router */
490
static void atrtr_set_default(struct net_device *dev)
492
atrtr_default.dev = dev;
493
atrtr_default.flags = RTF_UP;
494
atrtr_default.gateway.s_net = htons(0);
495
atrtr_default.gateway.s_node = 0;
499
* Add a router. Basically make sure it looks valid and stuff the
500
* entry in the list. While it uses netranges we always set them to one
501
* entry to work like netatalk.
503
static int atrtr_create(struct rtentry *r, struct net_device *devhint)
505
struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
506
struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
507
struct atalk_route *rt;
508
struct atalk_iface *iface, *riface;
509
int retval = -EINVAL;
512
* Fixme: Raise/Lower a routing change semaphore for these
516
/* Validate the request */
517
if (ta->sat_family != AF_APPLETALK ||
518
(!devhint && ga->sat_family != AF_APPLETALK))
521
/* Now walk the routing table and make our decisions */
522
write_lock_bh(&atalk_routes_lock);
523
for (rt = atalk_routes; rt; rt = rt->next) {
524
if (r->rt_flags != rt->flags)
527
if (ta->sat_addr.s_net == rt->target.s_net) {
528
if (!(rt->flags & RTF_HOST))
530
if (ta->sat_addr.s_node == rt->target.s_node)
538
read_lock_bh(&atalk_interfaces_lock);
539
for (iface = atalk_interfaces; iface; iface = iface->next) {
541
ntohs(ga->sat_addr.s_net) >=
542
ntohs(iface->nets.nr_firstnet) &&
543
ntohs(ga->sat_addr.s_net) <=
544
ntohs(iface->nets.nr_lastnet))
547
if (ga->sat_addr.s_net == iface->address.s_net &&
548
ga->sat_addr.s_node == iface->address.s_node)
551
read_unlock_bh(&atalk_interfaces_lock);
553
retval = -ENETUNREACH;
557
devhint = riface->dev;
561
rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
567
rt->next = atalk_routes;
571
/* Fill in the routing entry */
572
rt->target = ta->sat_addr;
575
rt->flags = r->rt_flags;
576
rt->gateway = ga->sat_addr;
580
write_unlock_bh(&atalk_routes_lock);
585
/* Delete a route. Find it and discard it */
586
static int atrtr_delete(struct atalk_addr * addr)
588
struct atalk_route **r = &atalk_routes;
590
struct atalk_route *tmp;
592
write_lock_bh(&atalk_routes_lock);
593
while ((tmp = *r) != NULL) {
594
if (tmp->target.s_net == addr->s_net &&
595
(!(tmp->flags&RTF_GATEWAY) ||
596
tmp->target.s_node == addr->s_node)) {
606
write_unlock_bh(&atalk_routes_lock);
611
* Called when a device is downed. Just throw away any routes
614
static void atrtr_device_down(struct net_device *dev)
616
struct atalk_route **r = &atalk_routes;
617
struct atalk_route *tmp;
619
write_lock_bh(&atalk_routes_lock);
620
while ((tmp = *r) != NULL) {
621
if (tmp->dev == dev) {
628
write_unlock_bh(&atalk_routes_lock);
630
if (atrtr_default.dev == dev)
631
atrtr_set_default(NULL);
634
/* Actually down the interface */
635
static inline void atalk_dev_down(struct net_device *dev)
637
atrtr_device_down(dev); /* Remove all routes for the device */
638
aarp_device_down(dev); /* Remove AARP entries for the device */
639
atif_drop_device(dev); /* Remove the device */
643
* A device event has occurred. Watch for devices going down and
644
* delete our use of them (iface and route).
646
static int ddp_device_event(struct notifier_block *this, unsigned long event,
649
struct net_device *dev = ptr;
651
if (!net_eq(dev_net(dev), &init_net))
654
if (event == NETDEV_DOWN)
655
/* Discard any use of this */
661
/* ioctl calls. Shouldn't even need touching */
662
/* Device configuration ioctl calls */
663
static int atif_ioctl(int cmd, void __user *arg)
665
static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
667
struct atalk_netrange *nr;
668
struct sockaddr_at *sa;
669
struct net_device *dev;
670
struct atalk_iface *atif;
673
struct rtentry rtdef;
676
if (copy_from_user(&atreq, arg, sizeof(atreq)))
679
dev = __dev_get_by_name(&init_net, atreq.ifr_name);
683
sa = (struct sockaddr_at *)&atreq.ifr_addr;
684
atif = atalk_find_dev(dev);
688
if (!capable(CAP_NET_ADMIN))
690
if (sa->sat_family != AF_APPLETALK)
692
if (dev->type != ARPHRD_ETHER &&
693
dev->type != ARPHRD_LOOPBACK &&
694
dev->type != ARPHRD_LOCALTLK &&
695
dev->type != ARPHRD_PPP)
696
return -EPROTONOSUPPORT;
698
nr = (struct atalk_netrange *)&sa->sat_zero[0];
702
* if this is a point-to-point iface, and we already
703
* have an iface for this AppleTalk address, then we
704
* should not add a route
706
if ((dev->flags & IFF_POINTOPOINT) &&
707
atalk_find_interface(sa->sat_addr.s_net,
708
sa->sat_addr.s_node)) {
709
printk(KERN_DEBUG "AppleTalk: point-to-point "
710
"interface added with "
711
"existing address\n");
716
* Phase 1 is fine on LocalTalk but we don't do
717
* EtherTalk phase 1. Anyone wanting to add it go ahead.
719
if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
720
return -EPROTONOSUPPORT;
721
if (sa->sat_addr.s_node == ATADDR_BCAST ||
722
sa->sat_addr.s_node == 254)
725
/* Already setting address */
726
if (atif->status & ATIF_PROBE)
729
atif->address.s_net = sa->sat_addr.s_net;
730
atif->address.s_node = sa->sat_addr.s_node;
731
atrtr_device_down(dev); /* Flush old routes */
733
atif = atif_add_device(dev, &sa->sat_addr);
740
* Check if the chosen address is used. If so we
741
* error and atalkd will try another.
744
if (!(dev->flags & IFF_LOOPBACK) &&
745
!(dev->flags & IFF_POINTOPOINT) &&
746
atif_probe_device(atif) < 0) {
747
atif_drop_device(dev);
751
/* Hey it worked - add the direct routes */
752
sa = (struct sockaddr_at *)&rtdef.rt_gateway;
753
sa->sat_family = AF_APPLETALK;
754
sa->sat_addr.s_net = atif->address.s_net;
755
sa->sat_addr.s_node = atif->address.s_node;
756
sa = (struct sockaddr_at *)&rtdef.rt_dst;
757
rtdef.rt_flags = RTF_UP;
758
sa->sat_family = AF_APPLETALK;
759
sa->sat_addr.s_node = ATADDR_ANYNODE;
760
if (dev->flags & IFF_LOOPBACK ||
761
dev->flags & IFF_POINTOPOINT)
762
rtdef.rt_flags |= RTF_HOST;
764
/* Routerless initial state */
765
if (nr->nr_firstnet == htons(0) &&
766
nr->nr_lastnet == htons(0xFFFE)) {
767
sa->sat_addr.s_net = atif->address.s_net;
768
atrtr_create(&rtdef, dev);
769
atrtr_set_default(dev);
771
limit = ntohs(nr->nr_lastnet);
772
if (limit - ntohs(nr->nr_firstnet) > 4096) {
773
printk(KERN_WARNING "Too many routes/"
778
for (ct = ntohs(nr->nr_firstnet);
780
sa->sat_addr.s_net = htons(ct);
781
atrtr_create(&rtdef, dev);
784
dev_mc_add_global(dev, aarp_mcast);
789
return -EADDRNOTAVAIL;
791
sa->sat_family = AF_APPLETALK;
792
sa->sat_addr = atif->address;
797
return -EADDRNOTAVAIL;
799
sa->sat_family = AF_APPLETALK;
800
sa->sat_addr.s_net = atif->address.s_net;
801
sa->sat_addr.s_node = ATADDR_BCAST;
804
case SIOCATALKDIFADDR:
806
if (!capable(CAP_NET_ADMIN))
808
if (sa->sat_family != AF_APPLETALK)
814
if (!capable(CAP_NET_ADMIN))
816
if (sa->sat_family != AF_APPLETALK)
819
* for now, we only support proxy AARP on ELAP;
820
* we should be able to do it for LocalTalk, too.
822
if (dev->type != ARPHRD_ETHER)
823
return -EPROTONOSUPPORT;
826
* atif points to the current interface on this network;
827
* we aren't concerned about its current status (at
828
* least for now), but it has all the settings about
829
* the network we're going to probe. Consequently, it
833
return -EADDRNOTAVAIL;
835
nr = (struct atalk_netrange *)&(atif->nets);
837
* Phase 1 is fine on Localtalk but we don't do
838
* Ethertalk phase 1. Anyone wanting to add it go ahead.
840
if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
841
return -EPROTONOSUPPORT;
843
if (sa->sat_addr.s_node == ATADDR_BCAST ||
844
sa->sat_addr.s_node == 254)
848
* Check if the chosen address is used. If so we
849
* error and ATCP will try another.
851
if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
855
* We now have an address on the local network, and
856
* the AARP code will defend it for us until we take it
857
* down. We don't set up any routes right now, because
858
* ATCP will install them manually via SIOCADDRT.
863
if (!capable(CAP_NET_ADMIN))
865
if (sa->sat_family != AF_APPLETALK)
868
return -EADDRNOTAVAIL;
870
/* give to aarp module to remove proxy entry */
871
aarp_proxy_remove(atif->dev, &(sa->sat_addr));
875
return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
878
/* Routing ioctl() calls */
879
static int atrtr_ioctl(unsigned int cmd, void __user *arg)
883
if (copy_from_user(&rt, arg, sizeof(rt)))
888
if (rt.rt_dst.sa_family != AF_APPLETALK)
890
return atrtr_delete(&((struct sockaddr_at *)
891
&rt.rt_dst)->sat_addr);
894
struct net_device *dev = NULL;
897
if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
899
name[IFNAMSIZ-1] = '\0';
900
dev = __dev_get_by_name(&init_net, name);
904
return atrtr_create(&rt, dev);
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_skb_frag(frag);
964
sum = atalk_sum_partial(vaddr + frag->page_offset +
965
offset - start, copy, sum);
966
kunmap_skb_frag(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)
1035
sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto);
1039
sock->ops = &atalk_dgram_ops;
1040
sock_init_data(sock, sk);
1042
/* Checksums on by default */
1043
sock_set_flag(sk, SOCK_ZAPPED);
1048
/* Free a socket. No work needed */
1049
static int atalk_release(struct socket *sock)
1051
struct sock *sk = sock->sk;
1059
atalk_destroy_socket(sk);
1068
* atalk_pick_and_bind_port - Pick a source port when one is not given
1069
* @sk - socket to insert into the tables
1070
* @sat - address to search for
1072
* Pick a source port when one is not given. If we can find a suitable free
1073
* one, we insert the socket into the tables using it.
1075
* This whole operation must be atomic.
1077
static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
1081
write_lock_bh(&atalk_sockets_lock);
1083
for (sat->sat_port = ATPORT_RESERVED;
1084
sat->sat_port < ATPORT_LAST;
1087
struct hlist_node *node;
1089
sk_for_each(s, node, &atalk_sockets) {
1090
struct atalk_sock *at = at_sk(s);
1092
if (at->src_net == sat->sat_addr.s_net &&
1093
at->src_node == sat->sat_addr.s_node &&
1094
at->src_port == sat->sat_port)
1098
/* Wheee, it's free, assign and insert. */
1099
__atalk_insert_socket(sk);
1100
at_sk(sk)->src_port = sat->sat_port;
1109
write_unlock_bh(&atalk_sockets_lock);
1113
static int atalk_autobind(struct sock *sk)
1115
struct atalk_sock *at = at_sk(sk);
1116
struct sockaddr_at sat;
1117
struct atalk_addr *ap = atalk_find_primary();
1118
int n = -EADDRNOTAVAIL;
1120
if (!ap || ap->s_net == htons(ATADDR_ANYNET))
1123
at->src_net = sat.sat_addr.s_net = ap->s_net;
1124
at->src_node = sat.sat_addr.s_node = ap->s_node;
1126
n = atalk_pick_and_bind_port(sk, &sat);
1128
sock_reset_flag(sk, SOCK_ZAPPED);
1133
/* Set the address 'our end' of the connection */
1134
static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1136
struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
1137
struct sock *sk = sock->sk;
1138
struct atalk_sock *at = at_sk(sk);
1141
if (!sock_flag(sk, SOCK_ZAPPED) ||
1142
addr_len != sizeof(struct sockaddr_at))
1145
if (addr->sat_family != AF_APPLETALK)
1146
return -EAFNOSUPPORT;
1149
if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
1150
struct atalk_addr *ap = atalk_find_primary();
1152
err = -EADDRNOTAVAIL;
1156
at->src_net = addr->sat_addr.s_net = ap->s_net;
1157
at->src_node = addr->sat_addr.s_node= ap->s_node;
1159
err = -EADDRNOTAVAIL;
1160
if (!atalk_find_interface(addr->sat_addr.s_net,
1161
addr->sat_addr.s_node))
1164
at->src_net = addr->sat_addr.s_net;
1165
at->src_node = addr->sat_addr.s_node;
1168
if (addr->sat_port == ATADDR_ANYPORT) {
1169
err = atalk_pick_and_bind_port(sk, addr);
1174
at->src_port = addr->sat_port;
1177
if (atalk_find_or_insert_socket(sk, addr))
1181
sock_reset_flag(sk, SOCK_ZAPPED);
1188
/* Set the address we talk to */
1189
static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
1190
int addr_len, int flags)
1192
struct sock *sk = sock->sk;
1193
struct atalk_sock *at = at_sk(sk);
1194
struct sockaddr_at *addr;
1197
sk->sk_state = TCP_CLOSE;
1198
sock->state = SS_UNCONNECTED;
1200
if (addr_len != sizeof(*addr))
1203
addr = (struct sockaddr_at *)uaddr;
1205
if (addr->sat_family != AF_APPLETALK)
1206
return -EAFNOSUPPORT;
1208
if (addr->sat_addr.s_node == ATADDR_BCAST &&
1209
!sock_flag(sk, SOCK_BROADCAST)) {
1211
printk(KERN_WARNING "%s is broken and did not set "
1212
"SO_BROADCAST. It will break when 2.2 is "
1222
if (sock_flag(sk, SOCK_ZAPPED))
1223
if (atalk_autobind(sk) < 0)
1227
if (!atrtr_get_dev(&addr->sat_addr))
1230
at->dest_port = addr->sat_port;
1231
at->dest_net = addr->sat_addr.s_net;
1232
at->dest_node = addr->sat_addr.s_node;
1234
sock->state = SS_CONNECTED;
1235
sk->sk_state = TCP_ESTABLISHED;
1243
* Find the name of an AppleTalk socket. Just copy the right
1244
* fields into the sockaddr.
1246
static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
1247
int *uaddr_len, int peer)
1249
struct sockaddr_at sat;
1250
struct sock *sk = sock->sk;
1251
struct atalk_sock *at = at_sk(sk);
1256
if (sock_flag(sk, SOCK_ZAPPED))
1257
if (atalk_autobind(sk) < 0)
1260
*uaddr_len = sizeof(struct sockaddr_at);
1261
memset(&sat.sat_zero, 0, sizeof(sat.sat_zero));
1265
if (sk->sk_state != TCP_ESTABLISHED)
1268
sat.sat_addr.s_net = at->dest_net;
1269
sat.sat_addr.s_node = at->dest_node;
1270
sat.sat_port = at->dest_port;
1272
sat.sat_addr.s_net = at->src_net;
1273
sat.sat_addr.s_node = at->src_node;
1274
sat.sat_port = at->src_port;
1278
sat.sat_family = AF_APPLETALK;
1279
memcpy(uaddr, &sat, sizeof(sat));
1286
#if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
1287
static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
1289
return skb->data[12] == 22;
1292
static int handle_ip_over_ddp(struct sk_buff *skb)
1294
struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
1295
struct net_device_stats *stats;
1297
/* This needs to be able to handle ipddp"N" devices */
1303
skb->protocol = htons(ETH_P_IP);
1306
skb_reset_transport_header(skb);
1308
stats = netdev_priv(dev);
1309
stats->rx_packets++;
1310
stats->rx_bytes += skb->len + 13;
1311
return netif_rx(skb); /* Send the SKB up to a higher place. */
1314
/* make it easy for gcc to optimize this test out, i.e. kill the code */
1315
#define is_ip_over_ddp(skb) 0
1316
#define handle_ip_over_ddp(skb) 0
1319
static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
1320
struct ddpehdr *ddp, __u16 len_hops, int origlen)
1322
struct atalk_route *rt;
1323
struct atalk_addr ta;
1326
* Don't route multicast, etc., packets, or packets sent to "this
1329
if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
1333
* Can it ever happen that a packet is from a PPP iface and
1334
* needs to be broadcast onto the default network?
1336
if (dev->type == ARPHRD_PPP)
1337
printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
1338
"packet received from PPP iface\n");
1342
ta.s_net = ddp->deh_dnet;
1343
ta.s_node = ddp->deh_dnode;
1345
/* Route the packet */
1346
rt = atrtr_find(&ta);
1347
/* increment hops count */
1348
len_hops += 1 << 10;
1349
if (!rt || !(len_hops & (15 << 10)))
1352
/* FIXME: use skb->cb to be able to use shared skbs */
1355
* Route goes through another gateway, so set the target to the
1359
if (rt->flags & RTF_GATEWAY) {
1360
ta.s_net = rt->gateway.s_net;
1361
ta.s_node = rt->gateway.s_node;
1364
/* Fix up skb->len field */
1365
skb_trim(skb, min_t(unsigned int, origlen,
1366
(rt->dev->hard_header_len +
1367
ddp_dl->header_length + (len_hops & 1023))));
1369
/* FIXME: use skb->cb to be able to use shared skbs */
1370
ddp->deh_len_hops = htons(len_hops);
1373
* Send the buffer onwards
1375
* Now we must always be careful. If it's come from LocalTalk to
1376
* EtherTalk it might not fit
1378
* Order matters here: If a packet has to be copied to make a new
1379
* headroom (rare hopefully) then it won't need unsharing.
1381
* Note. ddp-> becomes invalid at the realloc.
1383
if (skb_headroom(skb) < 22) {
1384
/* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
1385
struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
1389
skb = skb_unshare(skb, GFP_ATOMIC);
1392
* If the buffer didn't vanish into the lack of space bitbucket we can
1398
if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
1400
return NET_RX_SUCCESS;
1408
* atalk_rcv - Receive a packet (in skb) from device dev
1409
* @skb - packet received
1410
* @dev - network device where the packet comes from
1413
* Receive a packet (in skb) from device dev. This has come from the SNAP
1414
* decoder, and on entry skb->transport_header is the DDP header, skb->len
1415
* is the DDP header, skb->len is the DDP length. The physical headers
1416
* have been extracted. PPP should probably pass frames marked as for this
1417
* layer. [ie ARPHRD_ETHERTALK]
1419
static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
1420
struct packet_type *pt, struct net_device *orig_dev)
1422
struct ddpehdr *ddp;
1424
struct atalk_iface *atif;
1425
struct sockaddr_at tosat;
1429
if (!net_eq(dev_net(dev), &init_net))
1432
/* Don't mangle buffer if shared */
1433
if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1436
/* Size check and make sure header is contiguous */
1437
if (!pskb_may_pull(skb, sizeof(*ddp)))
1442
len_hops = ntohs(ddp->deh_len_hops);
1444
/* Trim buffer in case of stray trailing data */
1446
skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
1449
* Size check to see if ddp->deh_len was crap
1450
* (Otherwise we'll detonate most spectacularly
1451
* in the middle of atalk_checksum() or recvmsg()).
1453
if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
1454
pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
1455
"skb->len=%u)\n", len_hops & 1023, skb->len);
1460
* Any checksums. Note we don't do htons() on this == is assumed to be
1461
* valid for net byte orders all over the networking code...
1464
atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
1465
/* Not a valid AppleTalk frame - dustbin time */
1468
/* Check the packet is aimed at us */
1469
if (!ddp->deh_dnet) /* Net 0 is 'this network' */
1470
atif = atalk_find_anynet(ddp->deh_dnode, dev);
1472
atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
1475
/* Not ours, so we route the packet via the correct
1478
return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
1481
/* if IP over DDP is not selected this code will be optimized out */
1482
if (is_ip_over_ddp(skb))
1483
return handle_ip_over_ddp(skb);
1485
* Which socket - atalk_search_socket() looks for a *full match*
1486
* of the <net, node, port> tuple.
1488
tosat.sat_addr.s_net = ddp->deh_dnet;
1489
tosat.sat_addr.s_node = ddp->deh_dnode;
1490
tosat.sat_port = ddp->deh_dport;
1492
sock = atalk_search_socket(&tosat, atif);
1493
if (!sock) /* But not one of our sockets */
1496
/* Queue packet (standard) */
1499
if (sock_queue_rcv_skb(sock, skb) < 0)
1502
return NET_RX_SUCCESS;
1512
* Receive a LocalTalk frame. We make some demands on the caller here.
1513
* Caller must provide enough headroom on the packet to pull the short
1514
* header and append a long one.
1516
static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
1517
struct packet_type *pt, struct net_device *orig_dev)
1519
if (!net_eq(dev_net(dev), &init_net))
1522
/* Expand any short form frames */
1523
if (skb_mac_header(skb)[2] == 1) {
1524
struct ddpehdr *ddp;
1525
/* Find our address */
1526
struct atalk_addr *ap = atalk_find_dev_addr(dev);
1528
if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
1531
/* Don't mangle buffer if shared */
1532
if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
1536
* The push leaves us with a ddephdr not an shdr, and
1537
* handily the port bytes in the right place preset.
1539
ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4);
1541
/* Now fill in the long header */
1544
* These two first. The mac overlays the new source/dest
1545
* network information so we MUST copy these before
1546
* we write the network numbers !
1549
ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
1550
ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
1552
ddp->deh_dnet = ap->s_net; /* Network number */
1553
ddp->deh_snet = ap->s_net;
1554
ddp->deh_sum = 0; /* No checksum */
1556
* Not sure about this bit...
1558
/* Non routable, so force a drop if we slip up later */
1559
ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
1561
skb_reset_transport_header(skb);
1563
return atalk_rcv(skb, dev, pt, orig_dev);
1569
static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1572
struct sock *sk = sock->sk;
1573
struct atalk_sock *at = at_sk(sk);
1574
struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
1575
int flags = msg->msg_flags;
1577
struct sockaddr_at local_satalk, gsat;
1578
struct sk_buff *skb;
1579
struct net_device *dev;
1580
struct ddpehdr *ddp;
1582
struct atalk_route *rt;
1585
if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1588
if (len > DDP_MAXSZ)
1594
if (sock_flag(sk, SOCK_ZAPPED))
1595
if (atalk_autobind(sk) < 0)
1599
if (msg->msg_namelen < sizeof(*usat) ||
1600
usat->sat_family != AF_APPLETALK)
1604
/* netatalk didn't implement this check */
1605
if (usat->sat_addr.s_node == ATADDR_BCAST &&
1606
!sock_flag(sk, SOCK_BROADCAST)) {
1611
if (sk->sk_state != TCP_ESTABLISHED)
1613
usat = &local_satalk;
1614
usat->sat_family = AF_APPLETALK;
1615
usat->sat_port = at->dest_port;
1616
usat->sat_addr.s_node = at->dest_node;
1617
usat->sat_addr.s_net = at->dest_net;
1620
/* Build a packet */
1621
SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
1624
size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
1626
if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
1627
rt = atrtr_find(&usat->sat_addr);
1629
struct atalk_addr at_hint;
1632
at_hint.s_net = at->src_net;
1634
rt = atrtr_find(&at_hint);
1642
SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
1643
sk, size, dev->name);
1645
size += dev->hard_header_len;
1647
skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
1653
skb_reserve(skb, ddp_dl->header_length);
1654
skb_reserve(skb, dev->hard_header_len);
1657
SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
1659
ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
1660
ddp->deh_len_hops = htons(len + sizeof(*ddp));
1661
ddp->deh_dnet = usat->sat_addr.s_net;
1662
ddp->deh_snet = at->src_net;
1663
ddp->deh_dnode = usat->sat_addr.s_node;
1664
ddp->deh_snode = at->src_node;
1665
ddp->deh_dport = usat->sat_port;
1666
ddp->deh_sport = at->src_port;
1668
SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len);
1670
err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1677
if (sk->sk_no_check == 1)
1680
ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
1683
* Loopback broadcast packets to non gateway targets (ie routes
1684
* to group we are in)
1686
if (ddp->deh_dnode == ATADDR_BCAST &&
1687
!(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
1688
struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
1692
SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
1694
* If it fails it is queued/sent above in the aarp queue
1696
aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
1700
if (dev->flags & IFF_LOOPBACK || loopback) {
1701
SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
1704
if (ddp->deh_dnode == ATADDR_BCAST) {
1705
struct atalk_addr at_lo;
1710
rt = atrtr_find(&at_lo);
1719
ddp_dl->request(ddp_dl, skb, dev->dev_addr);
1721
SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
1722
if (rt->flags & RTF_GATEWAY) {
1723
gsat.sat_addr = rt->gateway;
1728
* If it fails it is queued/sent above in the aarp queue
1730
aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
1732
SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
1739
static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
1740
size_t size, int flags)
1742
struct sock *sk = sock->sk;
1743
struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
1744
struct ddpehdr *ddp;
1748
struct sk_buff *skb;
1750
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1751
flags & MSG_DONTWAIT, &err);
1757
/* FIXME: use skb->cb to be able to use shared skbs */
1759
copied = ntohs(ddp->deh_len_hops) & 1023;
1761
if (sk->sk_type != SOCK_RAW) {
1762
offset = sizeof(*ddp);
1766
if (copied > size) {
1768
msg->msg_flags |= MSG_TRUNC;
1770
err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
1774
sat->sat_family = AF_APPLETALK;
1775
sat->sat_port = ddp->deh_sport;
1776
sat->sat_addr.s_node = ddp->deh_snode;
1777
sat->sat_addr.s_net = ddp->deh_snet;
1779
msg->msg_namelen = sizeof(*sat);
1782
skb_free_datagram(sk, skb); /* Free the datagram. */
1786
return err ? : copied;
1791
* AppleTalk ioctl calls.
1793
static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1795
int rc = -ENOIOCTLCMD;
1796
struct sock *sk = sock->sk;
1797
void __user *argp = (void __user *)arg;
1800
/* Protocol layer */
1802
long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1806
rc = put_user(amount, (int __user *)argp);
1811
* These two are safe on a single CPU system as only
1812
* user tasks fiddle here
1814
struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1818
amount = skb->len - sizeof(struct ddpehdr);
1819
rc = put_user(amount, (int __user *)argp);
1823
rc = sock_get_timestamp(sk, argp);
1826
rc = sock_get_timestampns(sk, argp);
1832
if (capable(CAP_NET_ADMIN))
1833
rc = atrtr_ioctl(cmd, argp);
1838
case SIOCGIFBRDADDR:
1839
case SIOCATALKDIFADDR:
1841
case SIOCSARP: /* proxy AARP */
1842
case SIOCDARP: /* proxy AARP */
1844
rc = atif_ioctl(cmd, argp);
1853
#ifdef CONFIG_COMPAT
1854
static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1857
* SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
1858
* cannot handle it in common code. The data we access if ifreq
1859
* here is compatible, so we can simply call the native
1862
if (cmd == SIOCATALKDIFADDR)
1863
return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1865
return -ENOIOCTLCMD;
1870
static const struct net_proto_family atalk_family_ops = {
1871
.family = PF_APPLETALK,
1872
.create = atalk_create,
1873
.owner = THIS_MODULE,
1876
static const struct proto_ops atalk_dgram_ops = {
1877
.family = PF_APPLETALK,
1878
.owner = THIS_MODULE,
1879
.release = atalk_release,
1881
.connect = atalk_connect,
1882
.socketpair = sock_no_socketpair,
1883
.accept = sock_no_accept,
1884
.getname = atalk_getname,
1885
.poll = datagram_poll,
1886
.ioctl = atalk_ioctl,
1887
#ifdef CONFIG_COMPAT
1888
.compat_ioctl = atalk_compat_ioctl,
1890
.listen = sock_no_listen,
1891
.shutdown = sock_no_shutdown,
1892
.setsockopt = sock_no_setsockopt,
1893
.getsockopt = sock_no_getsockopt,
1894
.sendmsg = atalk_sendmsg,
1895
.recvmsg = atalk_recvmsg,
1896
.mmap = sock_no_mmap,
1897
.sendpage = sock_no_sendpage,
1900
static struct notifier_block ddp_notifier = {
1901
.notifier_call = ddp_device_event,
1904
static struct packet_type ltalk_packet_type __read_mostly = {
1905
.type = cpu_to_be16(ETH_P_LOCALTALK),
1909
static struct packet_type ppptalk_packet_type __read_mostly = {
1910
.type = cpu_to_be16(ETH_P_PPPTALK),
1914
static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
1916
/* Export symbols for use by drivers when AppleTalk is a module */
1917
EXPORT_SYMBOL(atrtr_get_dev);
1918
EXPORT_SYMBOL(atalk_find_dev_addr);
1920
static const char atalk_err_snap[] __initconst =
1921
KERN_CRIT "Unable to register DDP with SNAP.\n";
1923
/* Called by proto.c on kernel start up */
1924
static int __init atalk_init(void)
1926
int rc = proto_register(&ddp_proto, 0);
1931
(void)sock_register(&atalk_family_ops);
1932
ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
1934
printk(atalk_err_snap);
1936
dev_add_pack(<alk_packet_type);
1937
dev_add_pack(&ppptalk_packet_type);
1939
register_netdevice_notifier(&ddp_notifier);
1942
atalk_register_sysctl();
1946
module_init(atalk_init);
1949
* No explicit module reference count manipulation is needed in the
1950
* protocol. Socket layer sets module reference count for us
1951
* and interfaces reference counting is done
1952
* by the network device layer.
1954
* Ergo, before the AppleTalk module can be removed, all AppleTalk
1955
* sockets be closed from user space.
1957
static void __exit atalk_exit(void)
1959
#ifdef CONFIG_SYSCTL
1960
atalk_unregister_sysctl();
1961
#endif /* CONFIG_SYSCTL */
1963
aarp_cleanup_module(); /* General aarp clean-up. */
1964
unregister_netdevice_notifier(&ddp_notifier);
1965
dev_remove_pack(<alk_packet_type);
1966
dev_remove_pack(&ppptalk_packet_type);
1967
unregister_snap_client(ddp_dl);
1968
sock_unregister(PF_APPLETALK);
1969
proto_unregister(&ddp_proto);
1971
module_exit(atalk_exit);
1973
MODULE_LICENSE("GPL");
1974
MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
1975
MODULE_DESCRIPTION("AppleTalk 0.20\n");
1976
MODULE_ALIAS_NETPROTO(PF_APPLETALK);