blob: f11ad1d95e0e6e88294003fee338743863daa443 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Implements an IPX socket layer.
3 *
4 * This code is derived from work by
5 * Ross Biro : Writing the original IP stack
6 * Fred Van Kempen : Tidying up the TCP/IP
7 *
8 * Many thanks go to Keith Baker, Institute For Industrial Information
9 * Technology Ltd, Swansea University for allowing me to work on this
10 * in my own time even though it was in some ways related to commercial
11 * work I am currently employed to do there.
12 *
13 * All the material in this file is subject to the Gnu license version 2.
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +090014 * Neither Alan Cox nor the Swansea University Computer Society admit
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 * liability nor provide warranty for any of this software. This material
16 * is provided as is and at no charge.
17 *
18 * Portions Copyright (c) 2000-2003 Conectiva, Inc. <acme@conectiva.com.br>
19 * Neither Arnaldo Carvalho de Melo nor Conectiva, Inc. admit liability nor
20 * provide warranty for any of this software. This material is provided
21 * "AS-IS" and at no charge.
22 *
23 * Portions Copyright (c) 1995 Caldera, Inc. <greg@caldera.com>
24 * Neither Greg Page nor Caldera, Inc. admit liability nor provide
25 * warranty for any of this software. This material is provided
26 * "AS-IS" and at no charge.
27 *
28 * See net/ipx/ChangeLog.
29 */
30
Randy Dunlap4fc268d2006-01-11 12:17:47 -080031#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/errno.h>
33#include <linux/if_arp.h>
34#include <linux/if_ether.h>
35#include <linux/init.h>
36#include <linux/ipx.h>
37#include <linux/kernel.h>
38#include <linux/list.h>
39#include <linux/module.h>
40#include <linux/net.h>
41#include <linux/netdevice.h>
42#include <linux/uio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090043#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/skbuff.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
47#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <linux/types.h>
49#include <linux/termios.h>
50
51#include <net/ipx.h>
52#include <net/p8022.h>
53#include <net/psnap.h>
54#include <net/sock.h>
Rashika Kheria7780d8a2014-02-09 22:27:41 +053055#include <net/datalink.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070056#include <net/tcp_states.h>
Rashika Kheria535d3ae2014-02-09 22:29:14 +053057#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59#include <asm/uaccess.h>
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061/* Configuration Variables */
62static unsigned char ipxcfg_max_hops = 16;
63static char ipxcfg_auto_select_primary;
64static char ipxcfg_auto_create_interfaces;
65int sysctl_ipx_pprop_broadcasting = 1;
66
67/* Global Variables */
68static struct datalink_proto *p8022_datalink;
69static struct datalink_proto *pEII_datalink;
70static struct datalink_proto *p8023_datalink;
71static struct datalink_proto *pSNAP_datalink;
72
Eric Dumazet90ddc4f2005-12-22 12:49:22 -080073static const struct proto_ops ipx_dgram_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75LIST_HEAD(ipx_interfaces);
76DEFINE_SPINLOCK(ipx_interfaces_lock);
77
78struct ipx_interface *ipx_primary_net;
79struct ipx_interface *ipx_internal_net;
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081struct ipx_interface *ipx_interfaces_head(void)
82{
83 struct ipx_interface *rc = NULL;
84
85 if (!list_empty(&ipx_interfaces))
86 rc = list_entry(ipx_interfaces.next,
87 struct ipx_interface, node);
88 return rc;
89}
90
91static void ipxcfg_set_auto_select(char val)
92{
93 ipxcfg_auto_select_primary = val;
94 if (val && !ipx_primary_net)
95 ipx_primary_net = ipx_interfaces_head();
96}
97
98static int ipxcfg_get_config_data(struct ipx_config_data __user *arg)
99{
100 struct ipx_config_data vals;
101
102 vals.ipxcfg_auto_create_interfaces = ipxcfg_auto_create_interfaces;
103 vals.ipxcfg_auto_select_primary = ipxcfg_auto_select_primary;
104
105 return copy_to_user(arg, &vals, sizeof(vals)) ? -EFAULT : 0;
106}
107
108/*
109 * Note: Sockets may not be removed _during_ an interrupt or inet_bh
110 * handler using this technique. They can be added although we do not
111 * use this facility.
112 */
113
114static void ipx_remove_socket(struct sock *sk)
115{
116 /* Determine interface with which socket is associated */
117 struct ipx_interface *intrfc = ipx_sk(sk)->intrfc;
118
119 if (!intrfc)
120 goto out;
121
122 ipxitf_hold(intrfc);
123 spin_lock_bh(&intrfc->if_sklist_lock);
124 sk_del_node_init(sk);
125 spin_unlock_bh(&intrfc->if_sklist_lock);
126 ipxitf_put(intrfc);
127out:
128 return;
129}
130
131static void ipx_destroy_socket(struct sock *sk)
132{
133 ipx_remove_socket(sk);
134 skb_queue_purge(&sk->sk_receive_queue);
Pavel Emelyanovc2b42332007-11-10 21:39:26 -0800135 sk_refcnt_debug_dec(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900138/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 * The following code is used to support IPX Interfaces (IPXITF). An
140 * IPX interface is defined by a physical device and a frame type.
141 */
142
143/* ipxitf_clear_primary_net has to be called with ipx_interfaces_lock held */
144
145static void ipxitf_clear_primary_net(void)
146{
147 ipx_primary_net = NULL;
148 if (ipxcfg_auto_select_primary)
149 ipx_primary_net = ipx_interfaces_head();
150}
151
152static struct ipx_interface *__ipxitf_find_using_phys(struct net_device *dev,
Al Viro4833ed02006-11-03 00:27:06 -0800153 __be16 datalink)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
155 struct ipx_interface *i;
156
157 list_for_each_entry(i, &ipx_interfaces, node)
158 if (i->if_dev == dev && i->if_dlink_type == datalink)
159 goto out;
160 i = NULL;
161out:
162 return i;
163}
164
165static struct ipx_interface *ipxitf_find_using_phys(struct net_device *dev,
Al Viro4833ed02006-11-03 00:27:06 -0800166 __be16 datalink)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
168 struct ipx_interface *i;
169
170 spin_lock_bh(&ipx_interfaces_lock);
171 i = __ipxitf_find_using_phys(dev, datalink);
172 if (i)
173 ipxitf_hold(i);
174 spin_unlock_bh(&ipx_interfaces_lock);
175 return i;
176}
177
Al Viro4833ed02006-11-03 00:27:06 -0800178struct ipx_interface *ipxitf_find_using_net(__be32 net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
180 struct ipx_interface *i;
181
182 spin_lock_bh(&ipx_interfaces_lock);
183 if (net) {
184 list_for_each_entry(i, &ipx_interfaces, node)
185 if (i->if_netnum == net)
186 goto hold;
187 i = NULL;
188 goto unlock;
189 }
190
191 i = ipx_primary_net;
192 if (i)
193hold:
194 ipxitf_hold(i);
195unlock:
196 spin_unlock_bh(&ipx_interfaces_lock);
197 return i;
198}
199
200/* Sockets are bound to a particular IPX interface. */
201static void ipxitf_insert_socket(struct ipx_interface *intrfc, struct sock *sk)
202{
203 ipxitf_hold(intrfc);
204 spin_lock_bh(&intrfc->if_sklist_lock);
205 ipx_sk(sk)->intrfc = intrfc;
206 sk_add_node(sk, &intrfc->if_sklist);
207 spin_unlock_bh(&intrfc->if_sklist_lock);
208 ipxitf_put(intrfc);
209}
210
211/* caller must hold intrfc->if_sklist_lock */
212static struct sock *__ipxitf_find_socket(struct ipx_interface *intrfc,
Al Viro4833ed02006-11-03 00:27:06 -0800213 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
215 struct sock *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Sasha Levinb67bfe02013-02-27 17:06:00 -0800217 sk_for_each(s, &intrfc->if_sklist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 if (ipx_sk(s)->port == port)
219 goto found;
220 s = NULL;
221found:
222 return s;
223}
224
225/* caller must hold a reference to intrfc */
226static struct sock *ipxitf_find_socket(struct ipx_interface *intrfc,
Al Viro4833ed02006-11-03 00:27:06 -0800227 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
229 struct sock *s;
230
231 spin_lock_bh(&intrfc->if_sklist_lock);
232 s = __ipxitf_find_socket(intrfc, port);
233 if (s)
234 sock_hold(s);
235 spin_unlock_bh(&intrfc->if_sklist_lock);
236
237 return s;
238}
239
240#ifdef CONFIG_IPX_INTERN
241static struct sock *ipxitf_find_internal_socket(struct ipx_interface *intrfc,
242 unsigned char *ipx_node,
Al Viro4833ed02006-11-03 00:27:06 -0800243 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244{
245 struct sock *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247 ipxitf_hold(intrfc);
248 spin_lock_bh(&intrfc->if_sklist_lock);
249
Sasha Levinb67bfe02013-02-27 17:06:00 -0800250 sk_for_each(s, &intrfc->if_sklist) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 struct ipx_sock *ipxs = ipx_sk(s);
252
253 if (ipxs->port == port &&
254 !memcmp(ipx_node, ipxs->node, IPX_NODE_LEN))
255 goto found;
256 }
257 s = NULL;
258found:
259 spin_unlock_bh(&intrfc->if_sklist_lock);
260 ipxitf_put(intrfc);
261 return s;
262}
263#endif
264
265static void __ipxitf_down(struct ipx_interface *intrfc)
266{
267 struct sock *s;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800268 struct hlist_node *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 /* Delete all routes associated with this interface */
271 ipxrtr_del_routes(intrfc);
272
273 spin_lock_bh(&intrfc->if_sklist_lock);
274 /* error sockets */
Sasha Levinb67bfe02013-02-27 17:06:00 -0800275 sk_for_each_safe(s, t, &intrfc->if_sklist) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 struct ipx_sock *ipxs = ipx_sk(s);
277
278 s->sk_err = ENOLINK;
279 s->sk_error_report(s);
280 ipxs->intrfc = NULL;
281 ipxs->port = 0;
282 sock_set_flag(s, SOCK_ZAPPED); /* Indicates it is no longer bound */
283 sk_del_node_init(s);
284 }
285 INIT_HLIST_HEAD(&intrfc->if_sklist);
286 spin_unlock_bh(&intrfc->if_sklist_lock);
287
288 /* remove this interface from list */
289 list_del(&intrfc->node);
290
291 /* remove this interface from *special* networks */
292 if (intrfc == ipx_primary_net)
293 ipxitf_clear_primary_net();
294 if (intrfc == ipx_internal_net)
295 ipx_internal_net = NULL;
296
297 if (intrfc->if_dev)
298 dev_put(intrfc->if_dev);
299 kfree(intrfc);
300}
301
302void ipxitf_down(struct ipx_interface *intrfc)
303{
304 spin_lock_bh(&ipx_interfaces_lock);
305 __ipxitf_down(intrfc);
306 spin_unlock_bh(&ipx_interfaces_lock);
307}
308
Fabian Frederickb8901ac2014-10-27 21:12:08 +0100309static void __ipxitf_put(struct ipx_interface *intrfc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310{
311 if (atomic_dec_and_test(&intrfc->refcnt))
312 __ipxitf_down(intrfc);
313}
314
315static int ipxitf_device_event(struct notifier_block *notifier,
316 unsigned long event, void *ptr)
317{
Jiri Pirko351638e2013-05-28 01:30:21 +0000318 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 struct ipx_interface *i, *tmp;
320
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700321 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200322 return NOTIFY_DONE;
323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 if (event != NETDEV_DOWN && event != NETDEV_UP)
325 goto out;
326
327 spin_lock_bh(&ipx_interfaces_lock);
328 list_for_each_entry_safe(i, tmp, &ipx_interfaces, node)
329 if (i->if_dev == dev) {
330 if (event == NETDEV_UP)
331 ipxitf_hold(i);
332 else
333 __ipxitf_put(i);
334 }
335 spin_unlock_bh(&ipx_interfaces_lock);
336out:
337 return NOTIFY_DONE;
338}
339
340
341static __exit void ipxitf_cleanup(void)
342{
343 struct ipx_interface *i, *tmp;
344
345 spin_lock_bh(&ipx_interfaces_lock);
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900346 list_for_each_entry_safe(i, tmp, &ipx_interfaces, node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 __ipxitf_put(i);
348 spin_unlock_bh(&ipx_interfaces_lock);
349}
350
351static void ipxitf_def_skb_handler(struct sock *sock, struct sk_buff *skb)
352{
353 if (sock_queue_rcv_skb(sock, skb) < 0)
354 kfree_skb(skb);
355}
356
357/*
358 * On input skb->sk is NULL. Nobody is charged for the memory.
359 */
360
361/* caller must hold a reference to intrfc */
362
363#ifdef CONFIG_IPX_INTERN
364static int ipxitf_demux_socket(struct ipx_interface *intrfc,
365 struct sk_buff *skb, int copy)
366{
367 struct ipxhdr *ipx = ipx_hdr(skb);
368 int is_broadcast = !memcmp(ipx->ipx_dest.node, ipx_broadcast_node,
369 IPX_NODE_LEN);
370 struct sock *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 int rc;
372
373 spin_lock_bh(&intrfc->if_sklist_lock);
374
Sasha Levinb67bfe02013-02-27 17:06:00 -0800375 sk_for_each(s, &intrfc->if_sklist) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 struct ipx_sock *ipxs = ipx_sk(s);
377
378 if (ipxs->port == ipx->ipx_dest.sock &&
379 (is_broadcast || !memcmp(ipx->ipx_dest.node,
380 ipxs->node, IPX_NODE_LEN))) {
381 /* We found a socket to which to send */
382 struct sk_buff *skb1;
383
384 if (copy) {
385 skb1 = skb_clone(skb, GFP_ATOMIC);
386 rc = -ENOMEM;
387 if (!skb1)
388 goto out;
389 } else {
390 skb1 = skb;
391 copy = 1; /* skb may only be used once */
392 }
393 ipxitf_def_skb_handler(s, skb1);
394
395 /* On an external interface, one socket can listen */
396 if (intrfc != ipx_internal_net)
397 break;
398 }
399 }
400
401 /* skb was solely for us, and we did not make a copy, so free it. */
402 if (!copy)
403 kfree_skb(skb);
404
405 rc = 0;
406out:
407 spin_unlock_bh(&intrfc->if_sklist_lock);
408 return rc;
409}
410#else
411static struct sock *ncp_connection_hack(struct ipx_interface *intrfc,
412 struct ipxhdr *ipx)
413{
414 /* The packet's target is a NCP connection handler. We want to hand it
415 * to the correct socket directly within the kernel, so that the
416 * mars_nwe packet distribution process does not have to do it. Here we
417 * only care about NCP and BURST packets.
418 *
419 * You might call this a hack, but believe me, you do not want a
420 * complete NCP layer in the kernel, and this is VERY fast as well. */
421 struct sock *sk = NULL;
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900422 int connection = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 u8 *ncphdr = (u8 *)(ipx + 1);
424
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900425 if (*ncphdr == 0x22 && *(ncphdr + 1) == 0x22) /* NCP request */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 connection = (((int) *(ncphdr + 5)) << 8) | (int) *(ncphdr + 3);
427 else if (*ncphdr == 0x77 && *(ncphdr + 1) == 0x77) /* BURST packet */
428 connection = (((int) *(ncphdr + 9)) << 8) | (int) *(ncphdr + 8);
429
430 if (connection) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 /* Now we have to look for a special NCP connection handling
432 * socket. Only these sockets have ipx_ncp_conn != 0, set by
433 * SIOCIPXNCPCONN. */
434 spin_lock_bh(&intrfc->if_sklist_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800435 sk_for_each(sk, &intrfc->if_sklist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 if (ipx_sk(sk)->ipx_ncp_conn == connection) {
437 sock_hold(sk);
438 goto found;
439 }
440 sk = NULL;
441 found:
442 spin_unlock_bh(&intrfc->if_sklist_lock);
443 }
444 return sk;
445}
446
447static int ipxitf_demux_socket(struct ipx_interface *intrfc,
448 struct sk_buff *skb, int copy)
449{
450 struct ipxhdr *ipx = ipx_hdr(skb);
451 struct sock *sock1 = NULL, *sock2 = NULL;
452 struct sk_buff *skb1 = NULL, *skb2 = NULL;
453 int rc;
454
455 if (intrfc == ipx_primary_net && ntohs(ipx->ipx_dest.sock) == 0x451)
456 sock1 = ncp_connection_hack(intrfc, ipx);
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900457 if (!sock1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 /* No special socket found, forward the packet the normal way */
459 sock1 = ipxitf_find_socket(intrfc, ipx->ipx_dest.sock);
460
461 /*
462 * We need to check if there is a primary net and if
463 * this is addressed to one of the *SPECIAL* sockets because
464 * these need to be propagated to the primary net.
465 * The *SPECIAL* socket list contains: 0x452(SAP), 0x453(RIP) and
466 * 0x456(Diagnostic).
467 */
468
469 if (ipx_primary_net && intrfc != ipx_primary_net) {
470 const int dsock = ntohs(ipx->ipx_dest.sock);
471
472 if (dsock == 0x452 || dsock == 0x453 || dsock == 0x456)
473 /* The appropriate thing to do here is to dup the
474 * packet and route to the primary net interface via
475 * ipxitf_send; however, we'll cheat and just demux it
476 * here. */
477 sock2 = ipxitf_find_socket(ipx_primary_net,
478 ipx->ipx_dest.sock);
479 }
480
481 /*
482 * If there is nothing to do return. The kfree will cancel any charging.
483 */
484 rc = 0;
485 if (!sock1 && !sock2) {
486 if (!copy)
487 kfree_skb(skb);
488 goto out;
489 }
490
491 /*
492 * This next segment of code is a little awkward, but it sets it up
493 * so that the appropriate number of copies of the SKB are made and
494 * that skb1 and skb2 point to it (them) so that it (they) can be
495 * demuxed to sock1 and/or sock2. If we are unable to make enough
496 * copies, we do as much as is possible.
497 */
498
499 if (copy)
500 skb1 = skb_clone(skb, GFP_ATOMIC);
501 else
502 skb1 = skb;
503
504 rc = -ENOMEM;
505 if (!skb1)
506 goto out_put;
507
508 /* Do we need 2 SKBs? */
509 if (sock1 && sock2)
510 skb2 = skb_clone(skb1, GFP_ATOMIC);
511 else
512 skb2 = skb1;
513
514 if (sock1)
515 ipxitf_def_skb_handler(sock1, skb1);
516
517 if (!skb2)
518 goto out_put;
519
520 if (sock2)
521 ipxitf_def_skb_handler(sock2, skb2);
522
523 rc = 0;
524out_put:
525 if (sock1)
526 sock_put(sock1);
527 if (sock2)
528 sock_put(sock2);
529out:
530 return rc;
531}
532#endif /* CONFIG_IPX_INTERN */
533
534static struct sk_buff *ipxitf_adjust_skbuff(struct ipx_interface *intrfc,
535 struct sk_buff *skb)
536{
537 struct sk_buff *skb2;
538 int in_offset = (unsigned char *)ipx_hdr(skb) - skb->head;
539 int out_offset = intrfc->if_ipx_offset;
540 int len;
541
542 /* Hopefully, most cases */
543 if (in_offset >= out_offset)
544 return skb;
545
546 /* Need new SKB */
547 len = skb->len + out_offset;
548 skb2 = alloc_skb(len, GFP_ATOMIC);
549 if (skb2) {
550 skb_reserve(skb2, out_offset);
Arnaldo Carvalho de Melo7e28ecc2007-03-10 18:40:59 -0300551 skb_reset_network_header(skb2);
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300552 skb_reset_transport_header(skb2);
Arnaldo Carvalho de Melo7e28ecc2007-03-10 18:40:59 -0300553 skb_put(skb2, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 memcpy(ipx_hdr(skb2), ipx_hdr(skb), skb->len);
555 memcpy(skb2->cb, skb->cb, sizeof(skb->cb));
556 }
557 kfree_skb(skb);
558 return skb2;
559}
560
561/* caller must hold a reference to intrfc and the skb has to be unshared */
562int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, char *node)
563{
564 struct ipxhdr *ipx = ipx_hdr(skb);
565 struct net_device *dev = intrfc->if_dev;
566 struct datalink_proto *dl = intrfc->if_dlink;
567 char dest_node[IPX_NODE_LEN];
568 int send_to_wire = 1;
569 int addr_len;
570
571 ipx->ipx_tctrl = IPX_SKB_CB(skb)->ipx_tctrl;
572 ipx->ipx_dest.net = IPX_SKB_CB(skb)->ipx_dest_net;
573 ipx->ipx_source.net = IPX_SKB_CB(skb)->ipx_source_net;
574
575 /* see if we need to include the netnum in the route list */
576 if (IPX_SKB_CB(skb)->last_hop.index >= 0) {
Al Viro4833ed02006-11-03 00:27:06 -0800577 __be32 *last_hop = (__be32 *)(((u8 *) skb->data) +
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 sizeof(struct ipxhdr) +
579 IPX_SKB_CB(skb)->last_hop.index *
Al Viro4833ed02006-11-03 00:27:06 -0800580 sizeof(__be32));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 *last_hop = IPX_SKB_CB(skb)->last_hop.netnum;
582 IPX_SKB_CB(skb)->last_hop.index = -1;
583 }
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900584
585 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 * We need to know how many skbuffs it will take to send out this
587 * packet to avoid unnecessary copies.
588 */
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900589
590 if (!dl || !dev || dev->flags & IFF_LOOPBACK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 send_to_wire = 0; /* No non looped */
592
593 /*
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900594 * See if this should be demuxed to sockets on this interface
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 *
596 * We want to ensure the original was eaten or that we only use
597 * up clones.
598 */
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900599
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 if (ipx->ipx_dest.net == intrfc->if_netnum) {
601 /*
602 * To our own node, loop and free the original.
603 * The internal net will receive on all node address.
604 */
605 if (intrfc == ipx_internal_net ||
606 !memcmp(intrfc->if_node, node, IPX_NODE_LEN)) {
607 /* Don't charge sender */
608 skb_orphan(skb);
609
610 /* Will charge receiver */
611 return ipxitf_demux_socket(intrfc, skb, 0);
612 }
613
614 /* Broadcast, loop and possibly keep to send on. */
615 if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN)) {
616 if (!send_to_wire)
617 skb_orphan(skb);
618 ipxitf_demux_socket(intrfc, skb, send_to_wire);
619 if (!send_to_wire)
620 goto out;
621 }
622 }
623
624 /*
625 * If the originating net is not equal to our net; this is routed
626 * We are still charging the sender. Which is right - the driver
627 * free will handle this fairly.
628 */
629 if (ipx->ipx_source.net != intrfc->if_netnum) {
630 /*
631 * Unshare the buffer before modifying the count in
632 * case it's a flood or tcpdump
633 */
634 skb = skb_unshare(skb, GFP_ATOMIC);
635 if (!skb)
636 goto out;
637 if (++ipx->ipx_tctrl > ipxcfg_max_hops)
638 send_to_wire = 0;
639 }
640
641 if (!send_to_wire) {
642 kfree_skb(skb);
643 goto out;
644 }
645
646 /* Determine the appropriate hardware address */
647 addr_len = dev->addr_len;
648 if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN))
649 memcpy(dest_node, dev->broadcast, addr_len);
650 else
651 memcpy(dest_node, &(node[IPX_NODE_LEN-addr_len]), addr_len);
652
653 /* Make any compensation for differing physical/data link size */
654 skb = ipxitf_adjust_skbuff(intrfc, skb);
655 if (!skb)
656 goto out;
657
658 /* set up data link and physical headers */
659 skb->dev = dev;
660 skb->protocol = htons(ETH_P_IPX);
661
662 /* Send it out */
663 dl->request(dl, skb, dest_node);
664out:
665 return 0;
666}
667
668static int ipxitf_add_local_route(struct ipx_interface *intrfc)
669{
670 return ipxrtr_add_route(intrfc->if_netnum, intrfc, NULL);
671}
672
673static void ipxitf_discover_netnum(struct ipx_interface *intrfc,
674 struct sk_buff *skb);
675static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb);
676
677static int ipxitf_rcv(struct ipx_interface *intrfc, struct sk_buff *skb)
678{
679 struct ipxhdr *ipx = ipx_hdr(skb);
680 int rc = 0;
681
682 ipxitf_hold(intrfc);
683
684 /* See if we should update our network number */
685 if (!intrfc->if_netnum) /* net number of intrfc not known yet */
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900686 ipxitf_discover_netnum(intrfc, skb);
687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 IPX_SKB_CB(skb)->last_hop.index = -1;
689 if (ipx->ipx_type == IPX_TYPE_PPROP) {
690 rc = ipxitf_pprop(intrfc, skb);
691 if (rc)
692 goto out_free_skb;
693 }
694
695 /* local processing follows */
696 if (!IPX_SKB_CB(skb)->ipx_dest_net)
697 IPX_SKB_CB(skb)->ipx_dest_net = intrfc->if_netnum;
698 if (!IPX_SKB_CB(skb)->ipx_source_net)
699 IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum;
700
701 /* it doesn't make sense to route a pprop packet, there's no meaning
702 * in the ipx_dest_net for such packets */
703 if (ipx->ipx_type != IPX_TYPE_PPROP &&
704 intrfc->if_netnum != IPX_SKB_CB(skb)->ipx_dest_net) {
705 /* We only route point-to-point packets. */
706 if (skb->pkt_type == PACKET_HOST) {
707 skb = skb_unshare(skb, GFP_ATOMIC);
708 if (skb)
709 rc = ipxrtr_route_skb(skb);
710 goto out_intrfc;
711 }
712
713 goto out_free_skb;
714 }
715
716 /* see if we should keep it */
717 if (!memcmp(ipx_broadcast_node, ipx->ipx_dest.node, IPX_NODE_LEN) ||
718 !memcmp(intrfc->if_node, ipx->ipx_dest.node, IPX_NODE_LEN)) {
719 rc = ipxitf_demux_socket(intrfc, skb, 0);
720 goto out_intrfc;
721 }
722
723 /* we couldn't pawn it off so unload it */
724out_free_skb:
725 kfree_skb(skb);
726out_intrfc:
727 ipxitf_put(intrfc);
728 return rc;
729}
730
731static void ipxitf_discover_netnum(struct ipx_interface *intrfc,
732 struct sk_buff *skb)
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900733{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 const struct ipx_cb *cb = IPX_SKB_CB(skb);
735
736 /* see if this is an intra packet: source_net == dest_net */
737 if (cb->ipx_source_net == cb->ipx_dest_net && cb->ipx_source_net) {
738 struct ipx_interface *i =
739 ipxitf_find_using_net(cb->ipx_source_net);
740 /* NB: NetWare servers lie about their hop count so we
741 * dropped the test based on it. This is the best way
742 * to determine this is a 0 hop count packet. */
743 if (!i) {
744 intrfc->if_netnum = cb->ipx_source_net;
745 ipxitf_add_local_route(intrfc);
746 } else {
747 printk(KERN_WARNING "IPX: Network number collision "
748 "%lx\n %s %s and %s %s\n",
Al Viro4833ed02006-11-03 00:27:06 -0800749 (unsigned long) ntohl(cb->ipx_source_net),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 ipx_device_name(i),
751 ipx_frame_name(i->if_dlink_type),
752 ipx_device_name(intrfc),
753 ipx_frame_name(intrfc->if_dlink_type));
754 ipxitf_put(i);
755 }
756 }
757}
758
759/**
760 * ipxitf_pprop - Process packet propagation IPX packet type 0x14, used for
761 * NetBIOS broadcasts
762 * @intrfc: IPX interface receiving this packet
763 * @skb: Received packet
764 *
765 * Checks if packet is valid: if its more than %IPX_MAX_PPROP_HOPS hops or if it
766 * is smaller than a IPX header + the room for %IPX_MAX_PPROP_HOPS hops we drop
767 * it, not even processing it locally, if it has exact %IPX_MAX_PPROP_HOPS we
768 * don't broadcast it, but process it locally. See chapter 5 of Novell's "IPX
769 * RIP and SAP Router Specification", Part Number 107-000029-001.
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900770 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 * If it is valid, check if we have pprop broadcasting enabled by the user,
772 * if not, just return zero for local processing.
773 *
774 * If it is enabled check the packet and don't broadcast it if we have already
775 * seen this packet.
776 *
777 * Broadcast: send it to the interfaces that aren't on the packet visited nets
778 * array, just after the IPX header.
779 *
780 * Returns -EINVAL for invalid packets, so that the calling function drops
781 * the packet without local processing. 0 if packet is to be locally processed.
782 */
783static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb)
784{
785 struct ipxhdr *ipx = ipx_hdr(skb);
786 int i, rc = -EINVAL;
787 struct ipx_interface *ifcs;
788 char *c;
Al Viro4833ed02006-11-03 00:27:06 -0800789 __be32 *l;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
791 /* Illegal packet - too many hops or too short */
792 /* We decide to throw it away: no broadcasting, no local processing.
793 * NetBIOS unaware implementations route them as normal packets -
794 * tctrl <= 15, any data payload... */
795 if (IPX_SKB_CB(skb)->ipx_tctrl > IPX_MAX_PPROP_HOPS ||
796 ntohs(ipx->ipx_pktsize) < sizeof(struct ipxhdr) +
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900797 IPX_MAX_PPROP_HOPS * sizeof(u32))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 goto out;
799 /* are we broadcasting this damn thing? */
800 rc = 0;
801 if (!sysctl_ipx_pprop_broadcasting)
802 goto out;
803 /* We do broadcast packet on the IPX_MAX_PPROP_HOPS hop, but we
804 * process it locally. All previous hops broadcasted it, and process it
805 * locally. */
806 if (IPX_SKB_CB(skb)->ipx_tctrl == IPX_MAX_PPROP_HOPS)
807 goto out;
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900808
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 c = ((u8 *) ipx) + sizeof(struct ipxhdr);
Al Viro4833ed02006-11-03 00:27:06 -0800810 l = (__be32 *) c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
812 /* Don't broadcast packet if already seen this net */
813 for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
814 if (*l++ == intrfc->if_netnum)
815 goto out;
816
817 /* < IPX_MAX_PPROP_HOPS hops && input interface not in list. Save the
818 * position where we will insert recvd netnum into list, later on,
819 * in ipxitf_send */
820 IPX_SKB_CB(skb)->last_hop.index = i;
821 IPX_SKB_CB(skb)->last_hop.netnum = intrfc->if_netnum;
822 /* xmit on all other interfaces... */
823 spin_lock_bh(&ipx_interfaces_lock);
824 list_for_each_entry(ifcs, &ipx_interfaces, node) {
825 /* Except unconfigured interfaces */
826 if (!ifcs->if_netnum)
827 continue;
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +0900828
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 /* That aren't in the list */
830 if (ifcs == intrfc)
831 continue;
Al Viro4833ed02006-11-03 00:27:06 -0800832 l = (__be32 *) c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 /* don't consider the last entry in the packet list,
834 * it is our netnum, and it is not there yet */
835 for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
836 if (ifcs->if_netnum == *l++)
837 break;
838 if (i == IPX_SKB_CB(skb)->ipx_tctrl) {
839 struct sk_buff *s = skb_copy(skb, GFP_ATOMIC);
840
841 if (s) {
842 IPX_SKB_CB(s)->ipx_dest_net = ifcs->if_netnum;
843 ipxrtr_route_skb(s);
844 }
845 }
846 }
847 spin_unlock_bh(&ipx_interfaces_lock);
848out:
849 return rc;
850}
851
852static void ipxitf_insert(struct ipx_interface *intrfc)
853{
854 spin_lock_bh(&ipx_interfaces_lock);
855 list_add_tail(&intrfc->node, &ipx_interfaces);
856 spin_unlock_bh(&ipx_interfaces_lock);
857
858 if (ipxcfg_auto_select_primary && !ipx_primary_net)
859 ipx_primary_net = intrfc;
860}
861
Al Viro4833ed02006-11-03 00:27:06 -0800862static struct ipx_interface *ipxitf_alloc(struct net_device *dev, __be32 netnum,
863 __be16 dlink_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 struct datalink_proto *dlink,
865 unsigned char internal,
866 int ipx_offset)
867{
868 struct ipx_interface *intrfc = kmalloc(sizeof(*intrfc), GFP_ATOMIC);
869
870 if (intrfc) {
871 intrfc->if_dev = dev;
872 intrfc->if_netnum = netnum;
873 intrfc->if_dlink_type = dlink_type;
874 intrfc->if_dlink = dlink;
875 intrfc->if_internal = internal;
876 intrfc->if_ipx_offset = ipx_offset;
877 intrfc->if_sknum = IPX_MIN_EPHEMERAL_SOCKET;
878 INIT_HLIST_HEAD(&intrfc->if_sklist);
879 atomic_set(&intrfc->refcnt, 1);
880 spin_lock_init(&intrfc->if_sklist_lock);
881 }
882
883 return intrfc;
884}
885
886static int ipxitf_create_internal(struct ipx_interface_definition *idef)
887{
888 struct ipx_interface *intrfc;
889 int rc = -EEXIST;
890
891 /* Only one primary network allowed */
892 if (ipx_primary_net)
893 goto out;
894
895 /* Must have a valid network number */
896 rc = -EADDRNOTAVAIL;
897 if (!idef->ipx_network)
898 goto out;
899 intrfc = ipxitf_find_using_net(idef->ipx_network);
900 rc = -EADDRINUSE;
901 if (intrfc) {
902 ipxitf_put(intrfc);
903 goto out;
904 }
905 intrfc = ipxitf_alloc(NULL, idef->ipx_network, 0, NULL, 1, 0);
906 rc = -EAGAIN;
907 if (!intrfc)
908 goto out;
909 memcpy((char *)&(intrfc->if_node), idef->ipx_node, IPX_NODE_LEN);
910 ipx_internal_net = ipx_primary_net = intrfc;
911 ipxitf_hold(intrfc);
912 ipxitf_insert(intrfc);
913
914 rc = ipxitf_add_local_route(intrfc);
915 ipxitf_put(intrfc);
916out:
917 return rc;
918}
919
Alexey Dobriyan4ac396c2006-05-16 15:17:49 -0700920static __be16 ipx_map_frame_type(unsigned char type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921{
Alexey Dobriyan4ac396c2006-05-16 15:17:49 -0700922 __be16 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
924 switch (type) {
925 case IPX_FRAME_ETHERII: rc = htons(ETH_P_IPX); break;
926 case IPX_FRAME_8022: rc = htons(ETH_P_802_2); break;
927 case IPX_FRAME_SNAP: rc = htons(ETH_P_SNAP); break;
928 case IPX_FRAME_8023: rc = htons(ETH_P_802_3); break;
929 }
930
931 return rc;
932}
933
934static int ipxitf_create(struct ipx_interface_definition *idef)
935{
936 struct net_device *dev;
Al Viro4833ed02006-11-03 00:27:06 -0800937 __be16 dlink_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 struct datalink_proto *datalink = NULL;
939 struct ipx_interface *intrfc;
940 int rc;
941
942 if (idef->ipx_special == IPX_INTERNAL) {
943 rc = ipxitf_create_internal(idef);
944 goto out;
945 }
946
947 rc = -EEXIST;
948 if (idef->ipx_special == IPX_PRIMARY && ipx_primary_net)
949 goto out;
950
951 intrfc = ipxitf_find_using_net(idef->ipx_network);
952 rc = -EADDRINUSE;
953 if (idef->ipx_network && intrfc) {
954 ipxitf_put(intrfc);
955 goto out;
956 }
957
958 if (intrfc)
959 ipxitf_put(intrfc);
960
Eric W. Biederman881d9662007-09-17 11:56:21 -0700961 dev = dev_get_by_name(&init_net, idef->ipx_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 rc = -ENODEV;
963 if (!dev)
964 goto out;
965
966 switch (idef->ipx_dlink_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 case IPX_FRAME_8022:
968 dlink_type = htons(ETH_P_802_2);
969 datalink = p8022_datalink;
970 break;
971 case IPX_FRAME_ETHERII:
972 if (dev->type != ARPHRD_IEEE802) {
973 dlink_type = htons(ETH_P_IPX);
974 datalink = pEII_datalink;
975 break;
Paul Gortmaker211ed862012-05-10 17:14:35 -0400976 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 /* fall through */
978 case IPX_FRAME_SNAP:
979 dlink_type = htons(ETH_P_SNAP);
980 datalink = pSNAP_datalink;
981 break;
982 case IPX_FRAME_8023:
983 dlink_type = htons(ETH_P_802_3);
984 datalink = p8023_datalink;
985 break;
986 case IPX_FRAME_NONE:
987 default:
988 rc = -EPROTONOSUPPORT;
989 goto out_dev;
990 }
991
992 rc = -ENETDOWN;
993 if (!(dev->flags & IFF_UP))
994 goto out_dev;
995
996 /* Check addresses are suitable */
997 rc = -EINVAL;
998 if (dev->addr_len > IPX_NODE_LEN)
999 goto out_dev;
1000
1001 intrfc = ipxitf_find_using_phys(dev, dlink_type);
1002 if (!intrfc) {
1003 /* Ok now create */
1004 intrfc = ipxitf_alloc(dev, idef->ipx_network, dlink_type,
1005 datalink, 0, dev->hard_header_len +
1006 datalink->header_length);
1007 rc = -EAGAIN;
1008 if (!intrfc)
1009 goto out_dev;
1010 /* Setup primary if necessary */
1011 if (idef->ipx_special == IPX_PRIMARY)
1012 ipx_primary_net = intrfc;
1013 if (!memcmp(idef->ipx_node, "\000\000\000\000\000\000",
1014 IPX_NODE_LEN)) {
1015 memset(intrfc->if_node, 0, IPX_NODE_LEN);
1016 memcpy(intrfc->if_node + IPX_NODE_LEN - dev->addr_len,
1017 dev->dev_addr, dev->addr_len);
1018 } else
1019 memcpy(intrfc->if_node, idef->ipx_node, IPX_NODE_LEN);
1020 ipxitf_hold(intrfc);
1021 ipxitf_insert(intrfc);
1022 }
1023
1024
1025 /* If the network number is known, add a route */
1026 rc = 0;
1027 if (!intrfc->if_netnum)
1028 goto out_intrfc;
1029
1030 rc = ipxitf_add_local_route(intrfc);
1031out_intrfc:
1032 ipxitf_put(intrfc);
1033 goto out;
1034out_dev:
1035 dev_put(dev);
1036out:
1037 return rc;
1038}
1039
1040static int ipxitf_delete(struct ipx_interface_definition *idef)
1041{
1042 struct net_device *dev = NULL;
Al Viro4833ed02006-11-03 00:27:06 -08001043 __be16 dlink_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 struct ipx_interface *intrfc;
1045 int rc = 0;
1046
1047 spin_lock_bh(&ipx_interfaces_lock);
1048 if (idef->ipx_special == IPX_INTERNAL) {
1049 if (ipx_internal_net) {
1050 __ipxitf_put(ipx_internal_net);
1051 goto out;
1052 }
1053 rc = -ENOENT;
1054 goto out;
1055 }
1056
1057 dlink_type = ipx_map_frame_type(idef->ipx_dlink_type);
1058 rc = -EPROTONOSUPPORT;
1059 if (!dlink_type)
1060 goto out;
1061
Eric W. Biederman881d9662007-09-17 11:56:21 -07001062 dev = __dev_get_by_name(&init_net, idef->ipx_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 rc = -ENODEV;
1064 if (!dev)
1065 goto out;
1066
1067 intrfc = __ipxitf_find_using_phys(dev, dlink_type);
1068 rc = -EINVAL;
1069 if (!intrfc)
1070 goto out;
1071 __ipxitf_put(intrfc);
1072
1073 rc = 0;
1074out:
1075 spin_unlock_bh(&ipx_interfaces_lock);
1076 return rc;
1077}
1078
1079static struct ipx_interface *ipxitf_auto_create(struct net_device *dev,
Al Viro4833ed02006-11-03 00:27:06 -08001080 __be16 dlink_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081{
1082 struct ipx_interface *intrfc = NULL;
1083 struct datalink_proto *datalink;
1084
1085 if (!dev)
1086 goto out;
1087
1088 /* Check addresses are suitable */
1089 if (dev->addr_len > IPX_NODE_LEN)
1090 goto out;
1091
Al Viro4833ed02006-11-03 00:27:06 -08001092 switch (ntohs(dlink_type)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 case ETH_P_IPX: datalink = pEII_datalink; break;
1094 case ETH_P_802_2: datalink = p8022_datalink; break;
1095 case ETH_P_SNAP: datalink = pSNAP_datalink; break;
1096 case ETH_P_802_3: datalink = p8023_datalink; break;
1097 default: goto out;
1098 }
1099
1100 intrfc = ipxitf_alloc(dev, 0, dlink_type, datalink, 0,
1101 dev->hard_header_len + datalink->header_length);
1102
1103 if (intrfc) {
1104 memset(intrfc->if_node, 0, IPX_NODE_LEN);
1105 memcpy((char *)&(intrfc->if_node[IPX_NODE_LEN-dev->addr_len]),
1106 dev->dev_addr, dev->addr_len);
1107 spin_lock_init(&intrfc->if_sklist_lock);
1108 atomic_set(&intrfc->refcnt, 1);
1109 ipxitf_insert(intrfc);
1110 dev_hold(dev);
1111 }
1112
1113out:
1114 return intrfc;
1115}
1116
1117static int ipxitf_ioctl(unsigned int cmd, void __user *arg)
1118{
1119 int rc = -EINVAL;
1120 struct ifreq ifr;
1121 int val;
1122
1123 switch (cmd) {
1124 case SIOCSIFADDR: {
1125 struct sockaddr_ipx *sipx;
1126 struct ipx_interface_definition f;
1127
1128 rc = -EFAULT;
1129 if (copy_from_user(&ifr, arg, sizeof(ifr)))
1130 break;
1131 sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
1132 rc = -EINVAL;
1133 if (sipx->sipx_family != AF_IPX)
1134 break;
1135 f.ipx_network = sipx->sipx_network;
1136 memcpy(f.ipx_device, ifr.ifr_name,
1137 sizeof(f.ipx_device));
1138 memcpy(f.ipx_node, sipx->sipx_node, IPX_NODE_LEN);
1139 f.ipx_dlink_type = sipx->sipx_type;
1140 f.ipx_special = sipx->sipx_special;
1141
1142 if (sipx->sipx_action == IPX_DLTITF)
1143 rc = ipxitf_delete(&f);
1144 else
1145 rc = ipxitf_create(&f);
1146 break;
1147 }
1148 case SIOCGIFADDR: {
1149 struct sockaddr_ipx *sipx;
1150 struct ipx_interface *ipxif;
1151 struct net_device *dev;
1152
1153 rc = -EFAULT;
1154 if (copy_from_user(&ifr, arg, sizeof(ifr)))
1155 break;
1156 sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001157 dev = __dev_get_by_name(&init_net, ifr.ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 rc = -ENODEV;
1159 if (!dev)
1160 break;
1161 ipxif = ipxitf_find_using_phys(dev,
1162 ipx_map_frame_type(sipx->sipx_type));
1163 rc = -EADDRNOTAVAIL;
1164 if (!ipxif)
1165 break;
1166
1167 sipx->sipx_family = AF_IPX;
1168 sipx->sipx_network = ipxif->if_netnum;
1169 memcpy(sipx->sipx_node, ipxif->if_node,
1170 sizeof(sipx->sipx_node));
1171 rc = -EFAULT;
1172 if (copy_to_user(arg, &ifr, sizeof(ifr)))
1173 break;
1174 ipxitf_put(ipxif);
1175 rc = 0;
1176 break;
1177 }
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001178 case SIOCAIPXITFCRT:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 rc = -EFAULT;
1180 if (get_user(val, (unsigned char __user *) arg))
1181 break;
1182 rc = 0;
1183 ipxcfg_auto_create_interfaces = val;
1184 break;
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001185 case SIOCAIPXPRISLT:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 rc = -EFAULT;
1187 if (get_user(val, (unsigned char __user *) arg))
1188 break;
1189 rc = 0;
1190 ipxcfg_set_auto_select(val);
1191 break;
1192 }
1193
1194 return rc;
1195}
1196
1197/*
1198 * Checksum routine for IPX
1199 */
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001200
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201/* Note: We assume ipx_tctrl==0 and htons(length)==ipx_pktsize */
1202/* This functions should *not* mess with packet contents */
1203
Al Viro02e60372006-11-03 00:28:23 -08001204__be16 ipx_cksum(struct ipxhdr *packet, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205{
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001206 /*
1207 * NOTE: sum is a net byte order quantity, which optimizes the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 * loop. This only works on big and little endian machines. (I
1209 * don't know of a machine that isn't.)
1210 */
Al Viro02e60372006-11-03 00:28:23 -08001211 /* handle the first 3 words separately; checksum should be skipped
1212 * and ipx_tctrl masked out */
1213 __u16 *p = (__u16 *)packet;
1214 __u32 sum = p[1] + (p[2] & (__force u16)htons(0x00ff));
1215 __u32 i = (length >> 1) - 3; /* Number of remaining complete words */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216
Al Viro02e60372006-11-03 00:28:23 -08001217 /* Loop through them */
1218 p += 3;
1219 while (i--)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 sum += *p++;
1221
1222 /* Add on the last part word if it exists */
1223 if (packet->ipx_pktsize & htons(1))
Al Viro02e60372006-11-03 00:28:23 -08001224 sum += (__force u16)htons(0xff00) & *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225
1226 /* Do final fixup */
1227 sum = (sum & 0xffff) + (sum >> 16);
1228
1229 /* It's a pity there's no concept of carry in C */
1230 if (sum >= 0x10000)
1231 sum++;
1232
Al Viro02e60372006-11-03 00:28:23 -08001233 /*
1234 * Leave 0 alone; we don't want 0xffff here. Note that we can't get
1235 * here with 0x10000, so this check is the same as ((__u16)sum)
1236 */
1237 if (sum)
1238 sum = ~sum;
1239
1240 return (__force __be16)sum;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241}
1242
Al Viro4833ed02006-11-03 00:27:06 -08001243const char *ipx_frame_name(__be16 frame)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244{
1245 char* rc = "None";
1246
1247 switch (ntohs(frame)) {
1248 case ETH_P_IPX: rc = "EtherII"; break;
1249 case ETH_P_802_2: rc = "802.2"; break;
1250 case ETH_P_SNAP: rc = "SNAP"; break;
1251 case ETH_P_802_3: rc = "802.3"; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 }
1253
1254 return rc;
1255}
1256
1257const char *ipx_device_name(struct ipx_interface *intrfc)
1258{
1259 return intrfc->if_internal ? "Internal" :
1260 intrfc->if_dev ? intrfc->if_dev->name : "Unknown";
1261}
1262
1263/* Handling for system calls applied via the various interfaces to an IPX
1264 * socket object. */
1265
1266static int ipx_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001267 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268{
1269 struct sock *sk = sock->sk;
1270 int opt;
1271 int rc = -EINVAL;
1272
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001273 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 if (optlen != sizeof(int))
1275 goto out;
1276
1277 rc = -EFAULT;
1278 if (get_user(opt, (unsigned int __user *)optval))
1279 goto out;
1280
1281 rc = -ENOPROTOOPT;
1282 if (!(level == SOL_IPX && optname == IPX_TYPE))
1283 goto out;
1284
1285 ipx_sk(sk)->type = opt;
1286 rc = 0;
1287out:
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001288 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 return rc;
1290}
1291
1292static int ipx_getsockopt(struct socket *sock, int level, int optname,
1293 char __user *optval, int __user *optlen)
1294{
1295 struct sock *sk = sock->sk;
1296 int val = 0;
1297 int len;
1298 int rc = -ENOPROTOOPT;
1299
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001300 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 if (!(level == SOL_IPX && optname == IPX_TYPE))
1302 goto out;
1303
1304 val = ipx_sk(sk)->type;
1305
1306 rc = -EFAULT;
1307 if (get_user(len, optlen))
1308 goto out;
1309
1310 len = min_t(unsigned int, len, sizeof(int));
1311 rc = -EINVAL;
1312 if(len < 0)
1313 goto out;
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001314
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 rc = -EFAULT;
1316 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1317 goto out;
1318
1319 rc = 0;
1320out:
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001321 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 return rc;
1323}
1324
1325static struct proto ipx_proto = {
1326 .name = "IPX",
1327 .owner = THIS_MODULE,
1328 .obj_size = sizeof(struct ipx_sock),
1329};
1330
Eric Paris3f378b62009-11-05 22:18:14 -08001331static int ipx_create(struct net *net, struct socket *sock, int protocol,
1332 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333{
1334 int rc = -ESOCKTNOSUPPORT;
1335 struct sock *sk;
1336
Octavian Purdila09ad9bc2009-11-25 15:14:13 -08001337 if (!net_eq(net, &init_net))
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001338 return -EAFNOSUPPORT;
1339
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 /*
1341 * SPX support is not anymore in the kernel sources. If you want to
1342 * ressurrect it, completing it and making it understand shared skbs,
1343 * be fully multithreaded, etc, grab the sources in an early 2.5 kernel
1344 * tree.
1345 */
1346 if (sock->type != SOCK_DGRAM)
1347 goto out;
1348
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001349 rc = -ENOMEM;
Pavel Emelyanov6257ff22007-11-01 00:39:31 -07001350 sk = sk_alloc(net, PF_IPX, GFP_KERNEL, &ipx_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 if (!sk)
1352 goto out;
Pavel Emelyanovc2b42332007-11-10 21:39:26 -08001353
1354 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 sock_init_data(sock, sk);
Tom Herbert28448b82014-05-23 08:47:19 -07001356 sk->sk_no_check_tx = 1; /* Checksum off by default */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 sock->ops = &ipx_dgram_ops;
1358 rc = 0;
1359out:
1360 return rc;
1361}
1362
1363static int ipx_release(struct socket *sock)
1364{
1365 struct sock *sk = sock->sk;
1366
1367 if (!sk)
1368 goto out;
1369
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001370 lock_sock(sk);
Sabrina Dubroca8815cbd2014-02-09 00:23:38 +01001371 sk->sk_shutdown = SHUTDOWN_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 if (!sock_flag(sk, SOCK_DEAD))
1373 sk->sk_state_change(sk);
1374
1375 sock_set_flag(sk, SOCK_DEAD);
1376 sock->sk = NULL;
Pavel Emelyanovc2b42332007-11-10 21:39:26 -08001377 sk_refcnt_debug_release(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 ipx_destroy_socket(sk);
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001379 release_sock(sk);
Eric Dumazet674f2112011-03-21 18:16:39 -07001380 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381out:
1382 return 0;
1383}
1384
1385/* caller must hold a reference to intrfc */
1386
Al Viro4833ed02006-11-03 00:27:06 -08001387static __be16 ipx_first_free_socketnum(struct ipx_interface *intrfc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388{
1389 unsigned short socketNum = intrfc->if_sknum;
1390
1391 spin_lock_bh(&intrfc->if_sklist_lock);
1392
1393 if (socketNum < IPX_MIN_EPHEMERAL_SOCKET)
1394 socketNum = IPX_MIN_EPHEMERAL_SOCKET;
1395
Al Viro4833ed02006-11-03 00:27:06 -08001396 while (__ipxitf_find_socket(intrfc, htons(socketNum)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 if (socketNum > IPX_MAX_EPHEMERAL_SOCKET)
1398 socketNum = IPX_MIN_EPHEMERAL_SOCKET;
1399 else
1400 socketNum++;
1401
1402 spin_unlock_bh(&intrfc->if_sklist_lock);
1403 intrfc->if_sknum = socketNum;
1404
Al Viro4833ed02006-11-03 00:27:06 -08001405 return htons(socketNum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406}
1407
Arnd Bergmann83927ba2009-11-05 04:37:27 +00001408static int __ipx_bind(struct socket *sock,
1409 struct sockaddr *uaddr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410{
1411 struct sock *sk = sock->sk;
1412 struct ipx_sock *ipxs = ipx_sk(sk);
1413 struct ipx_interface *intrfc;
1414 struct sockaddr_ipx *addr = (struct sockaddr_ipx *)uaddr;
1415 int rc = -EINVAL;
1416
1417 if (!sock_flag(sk, SOCK_ZAPPED) || addr_len != sizeof(struct sockaddr_ipx))
1418 goto out;
1419
1420 intrfc = ipxitf_find_using_net(addr->sipx_network);
1421 rc = -EADDRNOTAVAIL;
1422 if (!intrfc)
1423 goto out;
1424
1425 if (!addr->sipx_port) {
1426 addr->sipx_port = ipx_first_free_socketnum(intrfc);
1427 rc = -EINVAL;
1428 if (!addr->sipx_port)
1429 goto out_put;
1430 }
1431
1432 /* protect IPX system stuff like routing/sap */
1433 rc = -EACCES;
1434 if (ntohs(addr->sipx_port) < IPX_MIN_EPHEMERAL_SOCKET &&
1435 !capable(CAP_NET_ADMIN))
1436 goto out_put;
1437
1438 ipxs->port = addr->sipx_port;
1439
1440#ifdef CONFIG_IPX_INTERN
1441 if (intrfc == ipx_internal_net) {
1442 /* The source address is to be set explicitly if the
1443 * socket is to be bound on the internal network. If a
1444 * node number 0 was specified, the default is used.
1445 */
1446
1447 rc = -EINVAL;
1448 if (!memcmp(addr->sipx_node, ipx_broadcast_node, IPX_NODE_LEN))
1449 goto out_put;
1450 if (!memcmp(addr->sipx_node, ipx_this_node, IPX_NODE_LEN))
1451 memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN);
1452 else
1453 memcpy(ipxs->node, addr->sipx_node, IPX_NODE_LEN);
1454
1455 rc = -EADDRINUSE;
1456 if (ipxitf_find_internal_socket(intrfc, ipxs->node,
1457 ipxs->port)) {
1458 SOCK_DEBUG(sk,
1459 "IPX: bind failed because port %X in use.\n",
Al Viro4833ed02006-11-03 00:27:06 -08001460 ntohs(addr->sipx_port));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 goto out_put;
1462 }
1463 } else {
1464 /* Source addresses are easy. It must be our
1465 * network:node pair for an interface routed to IPX
1466 * with the ipx routing ioctl()
1467 */
1468
1469 memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN);
1470
1471 rc = -EADDRINUSE;
1472 if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
1473 SOCK_DEBUG(sk,
1474 "IPX: bind failed because port %X in use.\n",
Al Viro4833ed02006-11-03 00:27:06 -08001475 ntohs(addr->sipx_port));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 goto out_put;
1477 }
1478 }
1479
1480#else /* !def CONFIG_IPX_INTERN */
1481
1482 /* Source addresses are easy. It must be our network:node pair for
1483 an interface routed to IPX with the ipx routing ioctl() */
1484
1485 rc = -EADDRINUSE;
1486 if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
1487 SOCK_DEBUG(sk, "IPX: bind failed because port %X in use.\n",
1488 ntohs((int)addr->sipx_port));
1489 goto out_put;
1490 }
1491
1492#endif /* CONFIG_IPX_INTERN */
1493
1494 ipxitf_insert_socket(intrfc, sk);
1495 sock_reset_flag(sk, SOCK_ZAPPED);
1496
1497 rc = 0;
1498out_put:
1499 ipxitf_put(intrfc);
1500out:
1501 return rc;
1502}
1503
Arnd Bergmann83927ba2009-11-05 04:37:27 +00001504static int ipx_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1505{
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001506 struct sock *sk = sock->sk;
Arnd Bergmann83927ba2009-11-05 04:37:27 +00001507 int rc;
1508
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001509 lock_sock(sk);
Arnd Bergmann83927ba2009-11-05 04:37:27 +00001510 rc = __ipx_bind(sock, uaddr, addr_len);
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001511 release_sock(sk);
Arnd Bergmann83927ba2009-11-05 04:37:27 +00001512
1513 return rc;
1514}
1515
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516static int ipx_connect(struct socket *sock, struct sockaddr *uaddr,
1517 int addr_len, int flags)
1518{
1519 struct sock *sk = sock->sk;
1520 struct ipx_sock *ipxs = ipx_sk(sk);
1521 struct sockaddr_ipx *addr;
1522 int rc = -EINVAL;
1523 struct ipx_route *rt;
1524
1525 sk->sk_state = TCP_CLOSE;
1526 sock->state = SS_UNCONNECTED;
1527
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001528 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 if (addr_len != sizeof(*addr))
1530 goto out;
1531 addr = (struct sockaddr_ipx *)uaddr;
1532
1533 /* put the autobinding in */
1534 if (!ipxs->port) {
1535 struct sockaddr_ipx uaddr;
1536
1537 uaddr.sipx_port = 0;
1538 uaddr.sipx_network = 0;
1539
1540#ifdef CONFIG_IPX_INTERN
1541 rc = -ENETDOWN;
1542 if (!ipxs->intrfc)
1543 goto out; /* Someone zonked the iface */
1544 memcpy(uaddr.sipx_node, ipxs->intrfc->if_node,
1545 IPX_NODE_LEN);
1546#endif /* CONFIG_IPX_INTERN */
1547
Arnd Bergmann83927ba2009-11-05 04:37:27 +00001548 rc = __ipx_bind(sock, (struct sockaddr *)&uaddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 sizeof(struct sockaddr_ipx));
1550 if (rc)
1551 goto out;
1552 }
1553
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001554 /* We can either connect to primary network or somewhere
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 * we can route to */
1556 rt = ipxrtr_lookup(addr->sipx_network);
1557 rc = -ENETUNREACH;
1558 if (!rt && !(!addr->sipx_network && ipx_primary_net))
1559 goto out;
1560
1561 ipxs->dest_addr.net = addr->sipx_network;
1562 ipxs->dest_addr.sock = addr->sipx_port;
1563 memcpy(ipxs->dest_addr.node, addr->sipx_node, IPX_NODE_LEN);
1564 ipxs->type = addr->sipx_type;
1565
1566 if (sock->type == SOCK_DGRAM) {
1567 sock->state = SS_CONNECTED;
1568 sk->sk_state = TCP_ESTABLISHED;
1569 }
1570
1571 if (rt)
1572 ipxrtr_put(rt);
1573 rc = 0;
1574out:
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001575 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 return rc;
1577}
1578
1579
1580static int ipx_getname(struct socket *sock, struct sockaddr *uaddr,
1581 int *uaddr_len, int peer)
1582{
1583 struct ipx_address *addr;
1584 struct sockaddr_ipx sipx;
1585 struct sock *sk = sock->sk;
1586 struct ipx_sock *ipxs = ipx_sk(sk);
1587 int rc;
1588
1589 *uaddr_len = sizeof(struct sockaddr_ipx);
1590
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001591 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 if (peer) {
1593 rc = -ENOTCONN;
1594 if (sk->sk_state != TCP_ESTABLISHED)
1595 goto out;
1596
1597 addr = &ipxs->dest_addr;
1598 sipx.sipx_network = addr->net;
1599 sipx.sipx_port = addr->sock;
1600 memcpy(sipx.sipx_node, addr->node, IPX_NODE_LEN);
1601 } else {
1602 if (ipxs->intrfc) {
1603 sipx.sipx_network = ipxs->intrfc->if_netnum;
1604#ifdef CONFIG_IPX_INTERN
1605 memcpy(sipx.sipx_node, ipxs->node, IPX_NODE_LEN);
1606#else
1607 memcpy(sipx.sipx_node, ipxs->intrfc->if_node,
1608 IPX_NODE_LEN);
1609#endif /* CONFIG_IPX_INTERN */
1610
1611 } else {
1612 sipx.sipx_network = 0;
1613 memset(sipx.sipx_node, '\0', IPX_NODE_LEN);
1614 }
1615
1616 sipx.sipx_port = ipxs->port;
1617 }
1618
1619 sipx.sipx_family = AF_IPX;
1620 sipx.sipx_type = ipxs->type;
1621 sipx.sipx_zero = 0;
1622 memcpy(uaddr, &sipx, sizeof(sipx));
1623
1624 rc = 0;
1625out:
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001626 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627 return rc;
1628}
1629
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001630static int ipx_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631{
1632 /* NULL here for pt means the packet was looped back */
1633 struct ipx_interface *intrfc;
1634 struct ipxhdr *ipx;
1635 u16 ipx_pktsize;
1636 int rc = 0;
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001637
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -07001638 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane730c152007-09-17 11:53:39 -07001639 goto drop;
1640
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001641 /* Not ours */
1642 if (skb->pkt_type == PACKET_OTHERHOST)
1643 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644
1645 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
1646 goto out;
1647
Stephen Hemminger7b1ba8d2006-08-08 16:48:51 -07001648 if (!pskb_may_pull(skb, sizeof(struct ipxhdr)))
1649 goto drop;
1650
David S. Millerfff64252006-08-09 17:36:15 -07001651 ipx_pktsize = ntohs(ipx_hdr(skb)->ipx_pktsize);
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001652
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 /* Too small or invalid header? */
Stephen Hemminger8b5cc5e2006-08-07 20:09:20 -07001654 if (ipx_pktsize < sizeof(struct ipxhdr) ||
1655 !pskb_may_pull(skb, ipx_pktsize))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 goto drop;
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001657
Stephen Hemminger7b1ba8d2006-08-08 16:48:51 -07001658 ipx = ipx_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 if (ipx->ipx_checksum != IPX_NO_CHECKSUM &&
1660 ipx->ipx_checksum != ipx_cksum(ipx, ipx_pktsize))
1661 goto drop;
1662
1663 IPX_SKB_CB(skb)->ipx_tctrl = ipx->ipx_tctrl;
1664 IPX_SKB_CB(skb)->ipx_dest_net = ipx->ipx_dest.net;
1665 IPX_SKB_CB(skb)->ipx_source_net = ipx->ipx_source.net;
1666
1667 /* Determine what local ipx endpoint this is */
1668 intrfc = ipxitf_find_using_phys(dev, pt->type);
1669 if (!intrfc) {
1670 if (ipxcfg_auto_create_interfaces &&
Al Viro4833ed02006-11-03 00:27:06 -08001671 IPX_SKB_CB(skb)->ipx_dest_net) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 intrfc = ipxitf_auto_create(dev, pt->type);
1673 if (intrfc)
1674 ipxitf_hold(intrfc);
1675 }
1676
1677 if (!intrfc) /* Not one of ours */
1678 /* or invalid packet for auto creation */
1679 goto drop;
1680 }
1681
1682 rc = ipxitf_rcv(intrfc, skb);
1683 ipxitf_put(intrfc);
1684 goto out;
1685drop:
1686 kfree_skb(skb);
1687out:
1688 return rc;
1689}
1690
1691static int ipx_sendmsg(struct kiocb *iocb, struct socket *sock,
1692 struct msghdr *msg, size_t len)
1693{
1694 struct sock *sk = sock->sk;
1695 struct ipx_sock *ipxs = ipx_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001696 DECLARE_SOCKADDR(struct sockaddr_ipx *, usipx, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 struct sockaddr_ipx local_sipx;
1698 int rc = -EINVAL;
1699 int flags = msg->msg_flags;
1700
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001701 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702 /* Socket gets bound below anyway */
1703/* if (sk->sk_zapped)
1704 return -EIO; */ /* Socket not bound */
1705 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1706 goto out;
1707
1708 /* Max possible packet size limited by 16 bit pktsize in header */
1709 if (len >= 65535 - sizeof(struct ipxhdr))
1710 goto out;
1711
1712 if (usipx) {
1713 if (!ipxs->port) {
1714 struct sockaddr_ipx uaddr;
1715
1716 uaddr.sipx_port = 0;
1717 uaddr.sipx_network = 0;
1718#ifdef CONFIG_IPX_INTERN
1719 rc = -ENETDOWN;
1720 if (!ipxs->intrfc)
1721 goto out; /* Someone zonked the iface */
1722 memcpy(uaddr.sipx_node, ipxs->intrfc->if_node,
1723 IPX_NODE_LEN);
1724#endif
Arnd Bergmann83927ba2009-11-05 04:37:27 +00001725 rc = __ipx_bind(sock, (struct sockaddr *)&uaddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 sizeof(struct sockaddr_ipx));
1727 if (rc)
1728 goto out;
1729 }
1730
1731 rc = -EINVAL;
1732 if (msg->msg_namelen < sizeof(*usipx) ||
1733 usipx->sipx_family != AF_IPX)
1734 goto out;
1735 } else {
1736 rc = -ENOTCONN;
1737 if (sk->sk_state != TCP_ESTABLISHED)
1738 goto out;
1739
1740 usipx = &local_sipx;
1741 usipx->sipx_family = AF_IPX;
1742 usipx->sipx_type = ipxs->type;
1743 usipx->sipx_port = ipxs->dest_addr.sock;
1744 usipx->sipx_network = ipxs->dest_addr.net;
1745 memcpy(usipx->sipx_node, ipxs->dest_addr.node, IPX_NODE_LEN);
1746 }
1747
Al Viroe1693712014-04-06 21:28:01 -04001748 rc = ipxrtr_route_packet(sk, usipx, msg, len, flags & MSG_DONTWAIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 if (rc >= 0)
1750 rc = len;
1751out:
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001752 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 return rc;
1754}
1755
1756
1757static int ipx_recvmsg(struct kiocb *iocb, struct socket *sock,
1758 struct msghdr *msg, size_t size, int flags)
1759{
1760 struct sock *sk = sock->sk;
1761 struct ipx_sock *ipxs = ipx_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001762 DECLARE_SOCKADDR(struct sockaddr_ipx *, sipx, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 struct ipxhdr *ipx = NULL;
1764 struct sk_buff *skb;
1765 int copied, rc;
Jiri Bohac01462402014-11-19 23:05:49 +01001766 bool locked = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001768 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 /* put the autobinding in */
1770 if (!ipxs->port) {
1771 struct sockaddr_ipx uaddr;
1772
1773 uaddr.sipx_port = 0;
1774 uaddr.sipx_network = 0;
1775
1776#ifdef CONFIG_IPX_INTERN
1777 rc = -ENETDOWN;
1778 if (!ipxs->intrfc)
1779 goto out; /* Someone zonked the iface */
1780 memcpy(uaddr.sipx_node, ipxs->intrfc->if_node, IPX_NODE_LEN);
1781#endif /* CONFIG_IPX_INTERN */
1782
Arnd Bergmann83927ba2009-11-05 04:37:27 +00001783 rc = __ipx_bind(sock, (struct sockaddr *)&uaddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 sizeof(struct sockaddr_ipx));
1785 if (rc)
1786 goto out;
1787 }
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001788
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 rc = -ENOTCONN;
1790 if (sock_flag(sk, SOCK_ZAPPED))
1791 goto out;
1792
Jiri Bohac01462402014-11-19 23:05:49 +01001793 release_sock(sk);
1794 locked = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1796 flags & MSG_DONTWAIT, &rc);
Sabrina Dubroca8815cbd2014-02-09 00:23:38 +01001797 if (!skb) {
1798 if (rc == -EAGAIN && (sk->sk_shutdown & RCV_SHUTDOWN))
1799 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 goto out;
Sabrina Dubroca8815cbd2014-02-09 00:23:38 +01001801 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802
1803 ipx = ipx_hdr(skb);
1804 copied = ntohs(ipx->ipx_pktsize) - sizeof(struct ipxhdr);
1805 if (copied > size) {
1806 copied = size;
1807 msg->msg_flags |= MSG_TRUNC;
1808 }
1809
David S. Miller51f3d022014-11-05 16:46:40 -05001810 rc = skb_copy_datagram_msg(skb, sizeof(struct ipxhdr), msg, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 if (rc)
1812 goto out_free;
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -07001813 if (skb->tstamp.tv64)
1814 sk->sk_stamp = skb->tstamp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816 if (sipx) {
1817 sipx->sipx_family = AF_IPX;
1818 sipx->sipx_port = ipx->ipx_source.sock;
1819 memcpy(sipx->sipx_node, ipx->ipx_source.node, IPX_NODE_LEN);
1820 sipx->sipx_network = IPX_SKB_CB(skb)->ipx_source_net;
1821 sipx->sipx_type = ipx->ipx_type;
1822 sipx->sipx_zero = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001823 msg->msg_namelen = sizeof(*sipx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 }
1825 rc = copied;
1826
1827out_free:
1828 skb_free_datagram(sk, skb);
1829out:
Jiri Bohac01462402014-11-19 23:05:49 +01001830 if (locked)
1831 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 return rc;
1833}
1834
1835
1836static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1837{
1838 int rc = 0;
1839 long amount = 0;
1840 struct sock *sk = sock->sk;
1841 void __user *argp = (void __user *)arg;
1842
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001843 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 switch (cmd) {
1845 case TIOCOUTQ:
Eric Dumazet31e6d362009-06-17 19:05:41 -07001846 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 if (amount < 0)
1848 amount = 0;
1849 rc = put_user(amount, (int __user *)argp);
1850 break;
1851 case TIOCINQ: {
1852 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1853 /* These two are safe on a single CPU system as only
1854 * user tasks fiddle here */
1855 if (skb)
1856 amount = skb->len - sizeof(struct ipxhdr);
1857 rc = put_user(amount, (int __user *)argp);
1858 break;
1859 }
1860 case SIOCADDRT:
1861 case SIOCDELRT:
1862 rc = -EPERM;
1863 if (capable(CAP_NET_ADMIN))
1864 rc = ipxrtr_ioctl(cmd, argp);
1865 break;
1866 case SIOCSIFADDR:
1867 case SIOCAIPXITFCRT:
1868 case SIOCAIPXPRISLT:
1869 rc = -EPERM;
1870 if (!capable(CAP_NET_ADMIN))
1871 break;
1872 case SIOCGIFADDR:
1873 rc = ipxitf_ioctl(cmd, argp);
1874 break;
1875 case SIOCIPXCFGDATA:
1876 rc = ipxcfg_get_config_data(argp);
1877 break;
1878 case SIOCIPXNCPCONN:
1879 /*
1880 * This socket wants to take care of the NCP connection
1881 * handed to us in arg.
1882 */
YOSHIFUJI Hideaki981c0ff2007-02-09 23:24:51 +09001883 rc = -EPERM;
1884 if (!capable(CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 break;
1886 rc = get_user(ipx_sk(sk)->ipx_ncp_conn,
1887 (const unsigned short __user *)argp);
1888 break;
1889 case SIOCGSTAMP:
David S. Miller32e90722012-05-19 00:51:04 -04001890 rc = sock_get_timestamp(sk, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 break;
1892 case SIOCGIFDSTADDR:
1893 case SIOCSIFDSTADDR:
1894 case SIOCGIFBRDADDR:
1895 case SIOCSIFBRDADDR:
1896 case SIOCGIFNETMASK:
1897 case SIOCSIFNETMASK:
1898 rc = -EINVAL;
1899 break;
1900 default:
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -08001901 rc = -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 break;
1903 }
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001904 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905
1906 return rc;
1907}
1908
Petr Vandrovecf6c90b72006-03-27 23:39:31 -08001909
1910#ifdef CONFIG_COMPAT
1911static int ipx_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1912{
1913 /*
1914 * These 4 commands use same structure on 32bit and 64bit. Rest of IPX
1915 * commands is handled by generic ioctl code. As these commands are
1916 * SIOCPROTOPRIVATE..SIOCPROTOPRIVATE+3, they cannot be handled by generic
1917 * code.
1918 */
1919 switch (cmd) {
1920 case SIOCAIPXITFCRT:
1921 case SIOCAIPXPRISLT:
1922 case SIOCIPXCFGDATA:
1923 case SIOCIPXNCPCONN:
1924 return ipx_ioctl(sock, cmd, arg);
1925 default:
1926 return -ENOIOCTLCMD;
1927 }
1928}
1929#endif
1930
Sabrina Dubroca8815cbd2014-02-09 00:23:38 +01001931static int ipx_shutdown(struct socket *sock, int mode)
1932{
1933 struct sock *sk = sock->sk;
1934
1935 if (mode < SHUT_RD || mode > SHUT_RDWR)
1936 return -EINVAL;
1937 /* This maps:
1938 * SHUT_RD (0) -> RCV_SHUTDOWN (1)
1939 * SHUT_WR (1) -> SEND_SHUTDOWN (2)
1940 * SHUT_RDWR (2) -> SHUTDOWN_MASK (3)
1941 */
1942 ++mode;
1943
1944 lock_sock(sk);
1945 sk->sk_shutdown |= mode;
1946 release_sock(sk);
1947 sk->sk_state_change(sk);
1948
1949 return 0;
1950}
Petr Vandrovecf6c90b72006-03-27 23:39:31 -08001951
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952/*
1953 * Socket family declarations
1954 */
1955
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00001956static const struct net_proto_family ipx_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957 .family = PF_IPX,
1958 .create = ipx_create,
1959 .owner = THIS_MODULE,
1960};
1961
Arnd Bergmann83927ba2009-11-05 04:37:27 +00001962static const struct proto_ops ipx_dgram_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963 .family = PF_IPX,
1964 .owner = THIS_MODULE,
1965 .release = ipx_release,
1966 .bind = ipx_bind,
1967 .connect = ipx_connect,
1968 .socketpair = sock_no_socketpair,
1969 .accept = sock_no_accept,
1970 .getname = ipx_getname,
Arnd Bergmannb0d0d912011-01-25 21:49:56 +01001971 .poll = datagram_poll,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 .ioctl = ipx_ioctl,
Petr Vandrovecf6c90b72006-03-27 23:39:31 -08001973#ifdef CONFIG_COMPAT
1974 .compat_ioctl = ipx_compat_ioctl,
1975#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 .listen = sock_no_listen,
Sabrina Dubroca8815cbd2014-02-09 00:23:38 +01001977 .shutdown = ipx_shutdown,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 .setsockopt = ipx_setsockopt,
1979 .getsockopt = ipx_getsockopt,
1980 .sendmsg = ipx_sendmsg,
1981 .recvmsg = ipx_recvmsg,
1982 .mmap = sock_no_mmap,
1983 .sendpage = sock_no_sendpage,
1984};
1985
Stephen Hemminger7546dd92009-03-09 08:18:29 +00001986static struct packet_type ipx_8023_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -08001987 .type = cpu_to_be16(ETH_P_802_3),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 .func = ipx_rcv,
1989};
1990
Stephen Hemminger7546dd92009-03-09 08:18:29 +00001991static struct packet_type ipx_dix_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -08001992 .type = cpu_to_be16(ETH_P_IPX),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 .func = ipx_rcv,
1994};
1995
1996static struct notifier_block ipx_dev_notifier = {
1997 .notifier_call = ipxitf_device_event,
1998};
1999
Stephen Hemmingerfa665cc2009-03-20 05:45:39 +00002000static const unsigned char ipx_8022_type = 0xE0;
2001static const unsigned char ipx_snap_id[5] = { 0x0, 0x0, 0x0, 0x81, 0x37 };
2002static const char ipx_EII_err_msg[] __initconst =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 KERN_CRIT "IPX: Unable to register with Ethernet II\n";
Stephen Hemmingerfa665cc2009-03-20 05:45:39 +00002004static const char ipx_8023_err_msg[] __initconst =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005 KERN_CRIT "IPX: Unable to register with 802.3\n";
Stephen Hemmingerfa665cc2009-03-20 05:45:39 +00002006static const char ipx_llc_err_msg[] __initconst =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007 KERN_CRIT "IPX: Unable to register with 802.2\n";
Stephen Hemmingerfa665cc2009-03-20 05:45:39 +00002008static const char ipx_snap_err_msg[] __initconst =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009 KERN_CRIT "IPX: Unable to register with SNAP\n";
2010
2011static int __init ipx_init(void)
2012{
2013 int rc = proto_register(&ipx_proto, 1);
2014
2015 if (rc != 0)
2016 goto out;
2017
2018 sock_register(&ipx_family_ops);
2019
2020 pEII_datalink = make_EII_client();
2021 if (pEII_datalink)
2022 dev_add_pack(&ipx_dix_packet_type);
2023 else
2024 printk(ipx_EII_err_msg);
2025
2026 p8023_datalink = make_8023_client();
2027 if (p8023_datalink)
2028 dev_add_pack(&ipx_8023_packet_type);
2029 else
2030 printk(ipx_8023_err_msg);
2031
2032 p8022_datalink = register_8022_client(ipx_8022_type, ipx_rcv);
2033 if (!p8022_datalink)
2034 printk(ipx_llc_err_msg);
2035
2036 pSNAP_datalink = register_snap_client(ipx_snap_id, ipx_rcv);
2037 if (!pSNAP_datalink)
2038 printk(ipx_snap_err_msg);
2039
2040 register_netdevice_notifier(&ipx_dev_notifier);
2041 ipx_register_sysctl();
2042 ipx_proc_init();
2043out:
2044 return rc;
2045}
2046
2047static void __exit ipx_proto_finito(void)
2048{
2049 ipx_proc_exit();
2050 ipx_unregister_sysctl();
2051
2052 unregister_netdevice_notifier(&ipx_dev_notifier);
2053
2054 ipxitf_cleanup();
2055
Jiri Bohac1539b982007-02-08 16:02:21 -08002056 if (pSNAP_datalink) {
2057 unregister_snap_client(pSNAP_datalink);
2058 pSNAP_datalink = NULL;
2059 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060
Jiri Bohac1539b982007-02-08 16:02:21 -08002061 if (p8022_datalink) {
2062 unregister_8022_client(p8022_datalink);
2063 p8022_datalink = NULL;
2064 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065
2066 dev_remove_pack(&ipx_8023_packet_type);
Jiri Bohac1539b982007-02-08 16:02:21 -08002067 if (p8023_datalink) {
2068 destroy_8023_client(p8023_datalink);
2069 p8023_datalink = NULL;
2070 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071
2072 dev_remove_pack(&ipx_dix_packet_type);
Jiri Bohac1539b982007-02-08 16:02:21 -08002073 if (pEII_datalink) {
2074 destroy_EII_client(pEII_datalink);
2075 pEII_datalink = NULL;
2076 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077
2078 proto_unregister(&ipx_proto);
2079 sock_unregister(ipx_family_ops.family);
2080}
2081
2082module_init(ipx_init);
2083module_exit(ipx_proto_finito);
2084MODULE_LICENSE("GPL");
2085MODULE_ALIAS_NETPROTO(PF_IPX);