blob: 007721632b07086fa78e5e2395d6b75bc76866a6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * X.25 Packet Layer release 002
3 *
4 * This is ALPHA test software. This code may break your machine,
5 * randomly fail to work with new releases, misbehave and/or generally
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +09006 * screw up. It might even work.
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * This code REQUIRES 2.1.15 or higher
9 *
10 * This module:
11 * This module is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * History
17 * X.25 001 Jonathan Naylor Started coding.
18 * X.25 002 Jonathan Naylor Centralised disconnect handling.
19 * New timer architecture.
20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +090021 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
22 * facilities negotiation and increased
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 * the throughput upper limit.
24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +090025 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 * Fixed x25_output() related skb leakage.
27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
31 * x25_proc.c, using seq_file
Shaun Pereiracb65d502005-06-22 22:15:01 -070032 * 2005-04-02 Shaun Pereira Selective sub address matching
33 * with call user data
Shaun Pereiraebc3f642005-06-22 22:16:17 -070034 * 2005-04-15 Shaun Pereira Fast select with no restriction on
35 * response
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 */
37
wangweidongb73e9e32013-12-06 19:24:33 +080038#define pr_fmt(fmt) "X25: " fmt
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080041#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/errno.h>
43#include <linux/kernel.h>
44#include <linux/sched.h>
45#include <linux/timer.h>
46#include <linux/string.h>
47#include <linux/net.h>
48#include <linux/netdevice.h>
49#include <linux/if_arp.h>
50#include <linux/skbuff.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090051#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <net/sock.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070053#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <asm/uaccess.h>
55#include <linux/fcntl.h>
56#include <linux/termios.h> /* For TIOCINQ/OUTQ */
57#include <linux/notifier.h>
58#include <linux/init.h>
Shaun Pereira1b06e6b2006-03-22 00:00:12 -080059#include <linux/compat.h>
andrew hendrya9288522010-02-14 02:00:45 +000060#include <linux/ctype.h>
Shaun Pereira1b06e6b2006-03-22 00:00:12 -080061
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <net/x25.h>
Shaun Pereira1b06e6b2006-03-22 00:00:12 -080063#include <net/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
66int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
67int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
68int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
69int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
Andrew Hendry39e21c02007-02-08 13:34:36 -080070int sysctl_x25_forward = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72HLIST_HEAD(x25_list);
73DEFINE_RWLOCK(x25_list_lock);
74
Eric Dumazet90ddc4f2005-12-22 12:49:22 -080075static const struct proto_ops x25_proto_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77static struct x25_address null_x25_address = {" "};
78
Shaun Pereira1b06e6b2006-03-22 00:00:12 -080079#ifdef CONFIG_COMPAT
80struct compat_x25_subscrip_struct {
81 char device[200-sizeof(compat_ulong_t)];
82 compat_ulong_t global_facil_mask;
83 compat_uint_t extended;
84};
85#endif
86
John Hughesf5eb9172010-04-07 21:29:25 -070087
88int x25_parse_address_block(struct sk_buff *skb,
89 struct x25_address *called_addr,
90 struct x25_address *calling_addr)
91{
92 unsigned char len;
93 int needed;
94 int rc;
95
Matthew Daleycb101ed2011-10-14 18:45:04 +000096 if (!pskb_may_pull(skb, 1)) {
John Hughesf5eb9172010-04-07 21:29:25 -070097 /* packet has no address block */
98 rc = 0;
99 goto empty;
100 }
101
102 len = *skb->data;
103 needed = 1 + (len >> 4) + (len & 0x0f);
104
Matthew Daleycb101ed2011-10-14 18:45:04 +0000105 if (!pskb_may_pull(skb, needed)) {
John Hughesf5eb9172010-04-07 21:29:25 -0700106 /* packet is too short to hold the addresses it claims
107 to hold */
108 rc = -1;
109 goto empty;
110 }
111
112 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
113
114empty:
115 *called_addr->x25_addr = 0;
116 *calling_addr->x25_addr = 0;
117
118 return rc;
119}
120
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
123 struct x25_address *calling_addr)
124{
Eric Dumazet6bf15742008-01-13 22:27:52 -0800125 unsigned int called_len, calling_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 char *called, *calling;
Eric Dumazet6bf15742008-01-13 22:27:52 -0800127 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 called_len = (*p >> 0) & 0x0F;
130 calling_len = (*p >> 4) & 0x0F;
131
132 called = called_addr->x25_addr;
133 calling = calling_addr->x25_addr;
134 p++;
135
136 for (i = 0; i < (called_len + calling_len); i++) {
137 if (i < called_len) {
138 if (i % 2 != 0) {
139 *called++ = ((*p >> 0) & 0x0F) + '0';
140 p++;
141 } else {
142 *called++ = ((*p >> 4) & 0x0F) + '0';
143 }
144 } else {
145 if (i % 2 != 0) {
146 *calling++ = ((*p >> 0) & 0x0F) + '0';
147 p++;
148 } else {
149 *calling++ = ((*p >> 4) & 0x0F) + '0';
150 }
151 }
152 }
153
154 *called = *calling = '\0';
155
156 return 1 + (called_len + calling_len + 1) / 2;
157}
158
159int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
160 struct x25_address *calling_addr)
161{
162 unsigned int called_len, calling_len;
163 char *called, *calling;
164 int i;
165
166 called = called_addr->x25_addr;
167 calling = calling_addr->x25_addr;
168
169 called_len = strlen(called);
170 calling_len = strlen(calling);
171
172 *p++ = (calling_len << 4) | (called_len << 0);
173
174 for (i = 0; i < (called_len + calling_len); i++) {
175 if (i < called_len) {
176 if (i % 2 != 0) {
177 *p |= (*called++ - '0') << 0;
178 p++;
179 } else {
180 *p = 0x00;
181 *p |= (*called++ - '0') << 4;
182 }
183 } else {
184 if (i % 2 != 0) {
185 *p |= (*calling++ - '0') << 0;
186 p++;
187 } else {
188 *p = 0x00;
189 *p |= (*calling++ - '0') << 4;
190 }
191 }
192 }
193
194 return 1 + (called_len + calling_len + 1) / 2;
195}
196
197/*
198 * Socket removal during an interrupt is now safe.
199 */
200static void x25_remove_socket(struct sock *sk)
201{
202 write_lock_bh(&x25_list_lock);
203 sk_del_node_init(sk);
204 write_unlock_bh(&x25_list_lock);
205}
206
207/*
208 * Kill all bound sockets on a dropped device.
209 */
210static void x25_kill_by_device(struct net_device *dev)
211{
212 struct sock *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214 write_lock_bh(&x25_list_lock);
215
Sasha Levinb67bfe02013-02-27 17:06:00 -0800216 sk_for_each(s, &x25_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
218 x25_disconnect(s, ENETUNREACH, 0, 0);
219
220 write_unlock_bh(&x25_list_lock);
221}
222
223/*
224 * Handle device status changes.
225 */
226static int x25_device_event(struct notifier_block *this, unsigned long event,
227 void *ptr)
228{
Jiri Pirko351638e2013-05-28 01:30:21 +0000229 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 struct x25_neigh *nb;
231
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700232 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200233 return NOTIFY_DONE;
234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (dev->type == ARPHRD_X25
Igor Maravić29c36262011-12-12 02:58:23 +0000236#if IS_ENABLED(CONFIG_LLC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 || dev->type == ARPHRD_ETHER
238#endif
239 ) {
240 switch (event) {
Joe Perchesfddc5f32011-07-01 09:43:13 +0000241 case NETDEV_UP:
242 x25_link_device_up(dev);
243 break;
244 case NETDEV_GOING_DOWN:
245 nb = x25_get_neigh(dev);
246 if (nb) {
247 x25_terminate_link(nb);
248 x25_neigh_put(nb);
249 }
250 break;
251 case NETDEV_DOWN:
252 x25_kill_by_device(dev);
253 x25_route_device_down(dev);
254 x25_link_device_down(dev);
255 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 }
257 }
258
259 return NOTIFY_DONE;
260}
261
262/*
263 * Add a socket to the bound sockets list.
264 */
265static void x25_insert_socket(struct sock *sk)
266{
267 write_lock_bh(&x25_list_lock);
268 sk_add_node(sk, &x25_list);
269 write_unlock_bh(&x25_list_lock);
270}
271
272/*
273 * Find a socket that wants to accept the Call Request we just
274 * received. Check the full list for an address/cud match.
275 * If no cuds match return the next_best thing, an address match.
276 * Note: if a listening socket has cud set it must only get calls
277 * with matching cud.
278 */
Shaun Pereiracb65d502005-06-22 22:15:01 -0700279static struct sock *x25_find_listener(struct x25_address *addr,
280 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281{
282 struct sock *s;
283 struct sock *next_best;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 read_lock_bh(&x25_list_lock);
286 next_best = NULL;
287
Sasha Levinb67bfe02013-02-27 17:06:00 -0800288 sk_for_each(s, &x25_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 if ((!strcmp(addr->x25_addr,
Shaun Pereiracb65d502005-06-22 22:15:01 -0700290 x25_sk(s)->source_addr.x25_addr) ||
291 !strcmp(addr->x25_addr,
292 null_x25_address.x25_addr)) &&
293 s->sk_state == TCP_LISTEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 /*
295 * Found a listening socket, now check the incoming
296 * call user data vs this sockets call user data
297 */
Matthew Daley7f81e252011-10-14 18:45:05 +0000298 if (x25_sk(s)->cudmatchlength > 0 &&
299 skb->len >= x25_sk(s)->cudmatchlength) {
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +0900300 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301 skb->data,
Shaun Pereiracb65d502005-06-22 22:15:01 -0700302 x25_sk(s)->cudmatchlength)) == 0) {
303 sock_hold(s);
304 goto found;
305 }
306 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 next_best = s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 }
309 if (next_best) {
310 s = next_best;
311 sock_hold(s);
312 goto found;
313 }
314 s = NULL;
315found:
316 read_unlock_bh(&x25_list_lock);
317 return s;
318}
319
320/*
321 * Find a connected X.25 socket given my LCI and neighbour.
322 */
323static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324{
325 struct sock *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Sasha Levinb67bfe02013-02-27 17:06:00 -0800327 sk_for_each(s, &x25_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
329 sock_hold(s);
330 goto found;
331 }
332 s = NULL;
333found:
334 return s;
335}
336
337struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
338{
339 struct sock *s;
340
341 read_lock_bh(&x25_list_lock);
342 s = __x25_find_socket(lci, nb);
343 read_unlock_bh(&x25_list_lock);
344 return s;
345}
346
347/*
348 * Find a unique LCI for a given device.
349 */
350static unsigned int x25_new_lci(struct x25_neigh *nb)
351{
352 unsigned int lci = 1;
353 struct sock *sk;
354
355 read_lock_bh(&x25_list_lock);
356
357 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
358 sock_put(sk);
359 if (++lci == 4096) {
360 lci = 0;
361 break;
362 }
363 }
364
365 read_unlock_bh(&x25_list_lock);
366 return lci;
367}
368
369/*
370 * Deferred destroy.
371 */
David S. Miller14ebaf82009-06-16 05:40:30 -0700372static void __x25_destroy_socket(struct sock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374/*
375 * handler for deferred kills.
376 */
377static void x25_destroy_timer(unsigned long data)
378{
David S. Miller14ebaf82009-06-16 05:40:30 -0700379 x25_destroy_socket_from_timer((struct sock *)data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
381
382/*
383 * This is called from user mode and the timers. Thus it protects itself
384 * against interrupt users but doesn't worry about being called during
385 * work. Once it is removed from the queue no interrupt or bottom half
386 * will touch it and we are (fairly 8-) ) safe.
387 * Not static as it's used by the timer
388 */
David S. Miller14ebaf82009-06-16 05:40:30 -0700389static void __x25_destroy_socket(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390{
391 struct sk_buff *skb;
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 x25_stop_heartbeat(sk);
394 x25_stop_timer(sk);
395
396 x25_remove_socket(sk);
397 x25_clear_queues(sk); /* Flush the queues */
398
399 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
400 if (skb->sk != sk) { /* A pending connection */
401 /*
402 * Queue the unaccepted socket for death
403 */
andrew hendry2cec6b02010-04-17 14:17:32 +0000404 skb->sk->sk_state = TCP_LISTEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 sock_set_flag(skb->sk, SOCK_DEAD);
406 x25_start_heartbeat(skb->sk);
407 x25_sk(skb->sk)->state = X25_STATE_0;
408 }
409
410 kfree_skb(skb);
411 }
412
Eric Dumazetc5640392009-06-16 10:12:03 +0000413 if (sk_has_allocations(sk)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 /* Defer: outstanding buffers */
415 sk->sk_timer.expires = jiffies + 10 * HZ;
416 sk->sk_timer.function = x25_destroy_timer;
417 sk->sk_timer.data = (unsigned long)sk;
418 add_timer(&sk->sk_timer);
419 } else {
420 /* drop last reference so sock_put will free */
421 __sock_put(sk);
422 }
David S. Miller14ebaf82009-06-16 05:40:30 -0700423}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
David S. Miller14ebaf82009-06-16 05:40:30 -0700425void x25_destroy_socket_from_timer(struct sock *sk)
426{
427 sock_hold(sk);
428 bh_lock_sock(sk);
429 __x25_destroy_socket(sk);
430 bh_unlock_sock(sk);
431 sock_put(sk);
432}
433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434/*
435 * Handling for system calls applied via the various interfaces to a
436 * X.25 socket object.
437 */
438
439static int x25_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700440 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
442 int opt;
443 struct sock *sk = sock->sk;
444 int rc = -ENOPROTOOPT;
445
446 if (level != SOL_X25 || optname != X25_QBITINCL)
447 goto out;
448
449 rc = -EINVAL;
450 if (optlen < sizeof(int))
451 goto out;
452
453 rc = -EFAULT;
454 if (get_user(opt, (int __user *)optval))
455 goto out;
456
andrew hendrycb863ff2010-05-16 22:59:41 +0000457 if (opt)
458 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
459 else
460 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 rc = 0;
462out:
463 return rc;
464}
465
466static int x25_getsockopt(struct socket *sock, int level, int optname,
467 char __user *optval, int __user *optlen)
468{
469 struct sock *sk = sock->sk;
470 int val, len, rc = -ENOPROTOOPT;
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +0900471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 if (level != SOL_X25 || optname != X25_QBITINCL)
473 goto out;
474
475 rc = -EFAULT;
476 if (get_user(len, optlen))
477 goto out;
478
479 len = min_t(unsigned int, len, sizeof(int));
480
481 rc = -EINVAL;
482 if (len < 0)
483 goto out;
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +0900484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 rc = -EFAULT;
486 if (put_user(len, optlen))
487 goto out;
488
andrew hendrycb863ff2010-05-16 22:59:41 +0000489 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
491out:
492 return rc;
493}
494
495static int x25_listen(struct socket *sock, int backlog)
496{
497 struct sock *sk = sock->sk;
498 int rc = -EOPNOTSUPP;
499
andrew hendry25aa4ef2010-09-14 13:31:16 +0000500 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 if (sk->sk_state != TCP_LISTEN) {
502 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
503 sk->sk_max_ack_backlog = backlog;
504 sk->sk_state = TCP_LISTEN;
505 rc = 0;
506 }
andrew hendry25aa4ef2010-09-14 13:31:16 +0000507 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 return rc;
510}
511
512static struct proto x25_proto = {
513 .name = "X25",
514 .owner = THIS_MODULE,
515 .obj_size = sizeof(struct x25_sock),
516};
517
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500518static struct sock *x25_alloc_socket(struct net *net, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
520 struct x25_sock *x25;
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500521 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 if (!sk)
524 goto out;
525
526 sock_init_data(NULL, sk);
527
528 x25 = x25_sk(sk);
529 skb_queue_head_init(&x25->ack_queue);
530 skb_queue_head_init(&x25->fragment_queue);
531 skb_queue_head_init(&x25->interrupt_in_queue);
532 skb_queue_head_init(&x25->interrupt_out_queue);
533out:
534 return sk;
535}
536
Eric Paris3f378b62009-11-05 22:18:14 -0800537static int x25_create(struct net *net, struct socket *sock, int protocol,
538 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539{
540 struct sock *sk;
541 struct x25_sock *x25;
andrew hendryb18e7a02010-02-14 02:00:11 +0000542 int rc = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800544 if (!net_eq(net, &init_net))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 goto out;
546
andrew hendryb18e7a02010-02-14 02:00:11 +0000547 rc = -ESOCKTNOSUPPORT;
548 if (sock->type != SOCK_SEQPACKET)
549 goto out;
550
551 rc = -EINVAL;
552 if (protocol)
553 goto out;
554
555 rc = -ENOBUFS;
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500556 if ((sk = x25_alloc_socket(net, kern)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 goto out;
558
559 x25 = x25_sk(sk);
560
561 sock_init_data(sock, sk);
562
563 x25_init_timers(sk);
564
565 sock->ops = &x25_proto_ops;
566 sk->sk_protocol = protocol;
567 sk->sk_backlog_rcv = x25_backlog_rcv;
568
569 x25->t21 = sysctl_x25_call_request_timeout;
570 x25->t22 = sysctl_x25_reset_request_timeout;
571 x25->t23 = sysctl_x25_clear_request_timeout;
572 x25->t2 = sysctl_x25_ack_holdback_timeout;
573 x25->state = X25_STATE_0;
Shaun Pereiracb65d502005-06-22 22:15:01 -0700574 x25->cudmatchlength = 0;
andrew hendry37cda782010-05-16 23:00:27 +0000575 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
Shaun Pereiraebc3f642005-06-22 22:16:17 -0700576 /* on call accept */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
579 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
580 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
581 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
John Hughesddd04512010-04-04 06:48:10 +0000582 x25->facilities.throughput = 0; /* by default don't negotiate
583 throughput */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 x25->facilities.reverse = X25_DEFAULT_REVERSE;
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +0900585 x25->dte_facilities.calling_len = 0;
586 x25->dte_facilities.called_len = 0;
587 memset(x25->dte_facilities.called_ae, '\0',
588 sizeof(x25->dte_facilities.called_ae));
589 memset(x25->dte_facilities.calling_ae, '\0',
590 sizeof(x25->dte_facilities.calling_ae));
Shaun Pereiraa64b7b92006-03-22 00:01:31 -0800591
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 rc = 0;
593out:
594 return rc;
595}
596
597static struct sock *x25_make_new(struct sock *osk)
598{
599 struct sock *sk = NULL;
600 struct x25_sock *x25, *ox25;
601
602 if (osk->sk_type != SOCK_SEQPACKET)
603 goto out;
604
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500605 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 goto out;
607
608 x25 = x25_sk(sk);
609
610 sk->sk_type = osk->sk_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 sk->sk_priority = osk->sk_priority;
612 sk->sk_protocol = osk->sk_protocol;
613 sk->sk_rcvbuf = osk->sk_rcvbuf;
614 sk->sk_sndbuf = osk->sk_sndbuf;
615 sk->sk_state = TCP_ESTABLISHED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
Shaun Pereiraa20a8552006-01-06 13:11:35 -0800617 sock_copy_flags(sk, osk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619 ox25 = x25_sk(osk);
620 x25->t21 = ox25->t21;
621 x25->t22 = ox25->t22;
622 x25->t23 = ox25->t23;
623 x25->t2 = ox25->t2;
andrew hendrycb863ff2010-05-16 22:59:41 +0000624 x25->flags = ox25->flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 x25->facilities = ox25->facilities;
Shaun Pereiraa64b7b92006-03-22 00:01:31 -0800626 x25->dte_facilities = ox25->dte_facilities;
Shaun Pereiracb65d502005-06-22 22:15:01 -0700627 x25->cudmatchlength = ox25->cudmatchlength;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
andrew hendryb7792e32010-05-16 23:00:02 +0000629 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 x25_init_timers(sk);
631out:
632 return sk;
633}
634
635static int x25_release(struct socket *sock)
636{
637 struct sock *sk = sock->sk;
638 struct x25_sock *x25;
639
640 if (!sk)
Arnd Bergmann77b22832011-01-22 23:44:59 +0100641 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
643 x25 = x25_sk(sk);
644
Arnd Bergmann77b22832011-01-22 23:44:59 +0100645 sock_hold(sk);
646 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 switch (x25->state) {
648
649 case X25_STATE_0:
650 case X25_STATE_2:
651 x25_disconnect(sk, 0, 0, 0);
Arnd Bergmann77b22832011-01-22 23:44:59 +0100652 __x25_destroy_socket(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 goto out;
654
655 case X25_STATE_1:
656 case X25_STATE_3:
657 case X25_STATE_4:
658 x25_clear_queues(sk);
659 x25_write_internal(sk, X25_CLEAR_REQUEST);
660 x25_start_t23timer(sk);
661 x25->state = X25_STATE_2;
662 sk->sk_state = TCP_CLOSE;
663 sk->sk_shutdown |= SEND_SHUTDOWN;
664 sk->sk_state_change(sk);
665 sock_set_flag(sk, SOCK_DEAD);
666 sock_set_flag(sk, SOCK_DESTROY);
667 break;
668 }
669
David S. Millerc751e4f2008-06-17 03:05:13 -0700670 sock_orphan(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671out:
Arnd Bergmann77b22832011-01-22 23:44:59 +0100672 release_sock(sk);
673 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 return 0;
675}
676
677static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
678{
679 struct sock *sk = sock->sk;
680 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
andrew hendrya9288522010-02-14 02:00:45 +0000681 int len, i, rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
683 if (!sock_flag(sk, SOCK_ZAPPED) ||
684 addr_len != sizeof(struct sockaddr_x25) ||
Arnd Bergmann91774902009-11-05 04:37:29 +0000685 addr->sx25_family != AF_X25) {
686 rc = -EINVAL;
687 goto out;
688 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
andrew hendrya9288522010-02-14 02:00:45 +0000690 len = strlen(addr->sx25_addr.x25_addr);
691 for (i = 0; i < len; i++) {
692 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
693 rc = -EINVAL;
694 goto out;
695 }
696 }
697
andrew hendry90c27292010-09-14 13:31:38 +0000698 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 x25_sk(sk)->source_addr = addr->sx25_addr;
700 x25_insert_socket(sk);
701 sock_reset_flag(sk, SOCK_ZAPPED);
andrew hendry90c27292010-09-14 13:31:38 +0000702 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
Arnd Bergmann91774902009-11-05 04:37:29 +0000704out:
Arnd Bergmann91774902009-11-05 04:37:29 +0000705 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706}
707
708static int x25_wait_for_connection_establishment(struct sock *sk)
709{
710 DECLARE_WAITQUEUE(wait, current);
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +0900711 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
Eric Dumazetaa395142010-04-20 13:03:51 +0000713 add_wait_queue_exclusive(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 for (;;) {
715 __set_current_state(TASK_INTERRUPTIBLE);
716 rc = -ERESTARTSYS;
717 if (signal_pending(current))
718 break;
719 rc = sock_error(sk);
720 if (rc) {
721 sk->sk_socket->state = SS_UNCONNECTED;
722 break;
723 }
724 rc = 0;
725 if (sk->sk_state != TCP_ESTABLISHED) {
726 release_sock(sk);
727 schedule();
728 lock_sock(sk);
729 } else
730 break;
731 }
732 __set_current_state(TASK_RUNNING);
Eric Dumazetaa395142010-04-20 13:03:51 +0000733 remove_wait_queue(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 return rc;
735}
736
737static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
738 int addr_len, int flags)
739{
740 struct sock *sk = sock->sk;
741 struct x25_sock *x25 = x25_sk(sk);
742 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
743 struct x25_route *rt;
744 int rc = 0;
745
746 lock_sock(sk);
747 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
748 sock->state = SS_CONNECTED;
749 goto out; /* Connect completed during a ERESTARTSYS event */
750 }
751
752 rc = -ECONNREFUSED;
753 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
754 sock->state = SS_UNCONNECTED;
755 goto out;
756 }
757
758 rc = -EISCONN; /* No reconnect on a seqpacket socket */
759 if (sk->sk_state == TCP_ESTABLISHED)
760 goto out;
761
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +0900762 sk->sk_state = TCP_CLOSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 sock->state = SS_UNCONNECTED;
764
765 rc = -EINVAL;
766 if (addr_len != sizeof(struct sockaddr_x25) ||
767 addr->sx25_family != AF_X25)
768 goto out;
769
770 rc = -ENETUNREACH;
771 rt = x25_get_route(&addr->sx25_addr);
772 if (!rt)
773 goto out;
774
775 x25->neighbour = x25_get_neigh(rt->dev);
776 if (!x25->neighbour)
777 goto out_put_route;
778
779 x25_limit_facilities(&x25->facilities, x25->neighbour);
780
781 x25->lci = x25_new_lci(x25->neighbour);
782 if (!x25->lci)
783 goto out_put_neigh;
784
785 rc = -EINVAL;
786 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
787 goto out_put_neigh;
788
789 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
790 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
791
792 x25->dest_addr = addr->sx25_addr;
793
794 /* Move to connecting socket, start sending Connect Requests */
795 sock->state = SS_CONNECTING;
796 sk->sk_state = TCP_SYN_SENT;
797
798 x25->state = X25_STATE_1;
799
800 x25_write_internal(sk, X25_CALL_REQUEST);
801
802 x25_start_heartbeat(sk);
803 x25_start_t21timer(sk);
804
805 /* Now the loop */
806 rc = -EINPROGRESS;
807 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
808 goto out_put_neigh;
809
810 rc = x25_wait_for_connection_establishment(sk);
811 if (rc)
812 goto out_put_neigh;
813
814 sock->state = SS_CONNECTED;
815 rc = 0;
816out_put_neigh:
817 if (rc)
818 x25_neigh_put(x25->neighbour);
819out_put_route:
820 x25_route_put(rt);
821out:
822 release_sock(sk);
823 return rc;
824}
825
Shaun Pereirabac37ec2006-03-22 00:00:40 -0800826static int x25_wait_for_data(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827{
828 DECLARE_WAITQUEUE(wait, current);
829 int rc = 0;
830
Eric Dumazetaa395142010-04-20 13:03:51 +0000831 add_wait_queue_exclusive(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 for (;;) {
833 __set_current_state(TASK_INTERRUPTIBLE);
834 if (sk->sk_shutdown & RCV_SHUTDOWN)
835 break;
836 rc = -ERESTARTSYS;
837 if (signal_pending(current))
838 break;
839 rc = -EAGAIN;
840 if (!timeout)
841 break;
842 rc = 0;
843 if (skb_queue_empty(&sk->sk_receive_queue)) {
844 release_sock(sk);
845 timeout = schedule_timeout(timeout);
846 lock_sock(sk);
847 } else
848 break;
849 }
850 __set_current_state(TASK_RUNNING);
Eric Dumazetaa395142010-04-20 13:03:51 +0000851 remove_wait_queue(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 return rc;
853}
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +0900854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
856{
857 struct sock *sk = sock->sk;
858 struct sock *newsk;
859 struct sk_buff *skb;
860 int rc = -EINVAL;
861
Andrew Hendry141646c2010-09-14 20:38:54 -0700862 if (!sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 goto out;
864
865 rc = -EOPNOTSUPP;
866 if (sk->sk_type != SOCK_SEQPACKET)
867 goto out;
868
869 lock_sock(sk);
Andrew Hendry141646c2010-09-14 20:38:54 -0700870 rc = -EINVAL;
871 if (sk->sk_state != TCP_LISTEN)
872 goto out2;
873
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
875 if (rc)
876 goto out2;
877 skb = skb_dequeue(&sk->sk_receive_queue);
878 rc = -EINVAL;
879 if (!skb->sk)
880 goto out2;
881 newsk = skb->sk;
David S. Millerb61d38e2008-06-17 02:44:35 -0700882 sock_graft(newsk, newsock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
884 /* Now attach up the new socket */
885 skb->sk = NULL;
886 kfree_skb(skb);
887 sk->sk_ack_backlog--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 newsock->state = SS_CONNECTED;
889 rc = 0;
890out2:
891 release_sock(sk);
892out:
893 return rc;
894}
895
896static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
897 int *uaddr_len, int peer)
898{
899 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
900 struct sock *sk = sock->sk;
901 struct x25_sock *x25 = x25_sk(sk);
Arnd Bergmann91774902009-11-05 04:37:29 +0000902 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
904 if (peer) {
Arnd Bergmann91774902009-11-05 04:37:29 +0000905 if (sk->sk_state != TCP_ESTABLISHED) {
906 rc = -ENOTCONN;
907 goto out;
908 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 sx25->sx25_addr = x25->dest_addr;
910 } else
911 sx25->sx25_addr = x25->source_addr;
912
913 sx25->sx25_family = AF_X25;
914 *uaddr_len = sizeof(*sx25);
915
Arnd Bergmann91774902009-11-05 04:37:29 +0000916out:
Arnd Bergmann91774902009-11-05 04:37:29 +0000917 return rc;
918}
919
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
921 unsigned int lci)
922{
923 struct sock *sk;
924 struct sock *make;
925 struct x25_sock *makex25;
926 struct x25_address source_addr, dest_addr;
927 struct x25_facilities facilities;
Shaun Pereiraa64b7b92006-03-22 00:01:31 -0800928 struct x25_dte_facilities dte_facilities;
Andrew Hendry95a9dc42007-02-08 13:34:02 -0800929 int len, addr_len, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
931 /*
932 * Remove the LCI and frame type.
933 */
934 skb_pull(skb, X25_STD_MIN_LEN);
935
936 /*
937 * Extract the X.25 addresses and convert them to ASCII strings,
938 * and remove them.
John Hughesf5eb9172010-04-07 21:29:25 -0700939 *
940 * Address block is mandatory in call request packets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 */
John Hughesf5eb9172010-04-07 21:29:25 -0700942 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
943 if (addr_len <= 0)
944 goto out_clear_request;
Andrew Hendry95a9dc42007-02-08 13:34:02 -0800945 skb_pull(skb, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946
947 /*
948 * Get the length of the facilities, skip past them for the moment
949 * get the call user data because this is needed to determine
950 * the correct listener
John Hughesf5eb9172010-04-07 21:29:25 -0700951 *
952 * Facilities length is mandatory in call request packets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 */
Matthew Daleycb101ed2011-10-14 18:45:04 +0000954 if (!pskb_may_pull(skb, 1))
John Hughesf5eb9172010-04-07 21:29:25 -0700955 goto out_clear_request;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 len = skb->data[0] + 1;
Matthew Daleycb101ed2011-10-14 18:45:04 +0000957 if (!pskb_may_pull(skb, len))
John Hughesf5eb9172010-04-07 21:29:25 -0700958 goto out_clear_request;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 skb_pull(skb,len);
960
961 /*
Matthew Daleyc7fd0d42011-10-14 18:45:03 +0000962 * Ensure that the amount of call user data is valid.
963 */
964 if (skb->len > X25_MAX_CUD_LEN)
965 goto out_clear_request;
966
967 /*
Matthew Daleycb101ed2011-10-14 18:45:04 +0000968 * Get all the call user data so it can be used in
969 * x25_find_listener and skb_copy_from_linear_data up ahead.
970 */
971 if (!pskb_may_pull(skb, skb->len))
972 goto out_clear_request;
973
974 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 * Find a listener for the particular address/cud pair.
976 */
Shaun Pereiracb65d502005-06-22 22:15:01 -0700977 sk = x25_find_listener(&source_addr,skb);
978 skb_push(skb,len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
Andrew Hendry95a9dc42007-02-08 13:34:02 -0800980 if (sk != NULL && sk_acceptq_is_full(sk)) {
981 goto out_sock_put;
982 }
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 /*
Andrew Hendry95a9dc42007-02-08 13:34:02 -0800985 * We dont have any listeners for this incoming call.
986 * Try forwarding it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 */
Andrew Hendry95a9dc42007-02-08 13:34:02 -0800988 if (sk == NULL) {
989 skb_push(skb, addr_len + X25_STD_MIN_LEN);
Andrew Hendry39e21c02007-02-08 13:34:36 -0800990 if (sysctl_x25_forward &&
991 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
Andrew Hendry95a9dc42007-02-08 13:34:02 -0800992 {
993 /* Call was forwarded, dont process it any more */
994 kfree_skb(skb);
995 rc = 1;
996 goto out;
997 } else {
998 /* No listeners, can't forward, clear the call */
999 goto out_clear_request;
1000 }
1001 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
1003 /*
1004 * Try to reach a compromise on the requested facilities.
1005 */
Shaun Pereiraa64b7b92006-03-22 00:01:31 -08001006 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1007 if (len == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 goto out_sock_put;
1009
1010 /*
1011 * current neighbour/link might impose additional limits
1012 * on certain facilties
1013 */
1014
1015 x25_limit_facilities(&facilities, nb);
1016
1017 /*
1018 * Try to create a new socket.
1019 */
1020 make = x25_make_new(sk);
1021 if (!make)
1022 goto out_sock_put;
1023
1024 /*
1025 * Remove the facilities
1026 */
1027 skb_pull(skb, len);
1028
1029 skb->sk = make;
1030 make->sk_state = TCP_ESTABLISHED;
1031
1032 makex25 = x25_sk(make);
1033 makex25->lci = lci;
1034 makex25->dest_addr = dest_addr;
1035 makex25->source_addr = source_addr;
1036 makex25->neighbour = nb;
1037 makex25->facilities = facilities;
Shaun Pereiraa64b7b92006-03-22 00:01:31 -08001038 makex25->dte_facilities= dte_facilities;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
Shaun Pereiracb65d502005-06-22 22:15:01 -07001040 /* ensure no reverse facil on accept */
1041 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
Shaun Pereiraa64b7b92006-03-22 00:01:31 -08001042 /* ensure no calling address extension on accept */
1043 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
Shaun Pereiracb65d502005-06-22 22:15:01 -07001044 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
andrew hendry37cda782010-05-16 23:00:27 +00001046 /* Normally all calls are accepted immediately */
1047 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
Shaun Pereiraebc3f642005-06-22 22:16:17 -07001048 x25_write_internal(make, X25_CALL_ACCEPTED);
1049 makex25->state = X25_STATE_3;
1050 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051
Shaun Pereiracb65d502005-06-22 22:15:01 -07001052 /*
1053 * Incoming Call User Data.
1054 */
Roel Kluin8db09f22009-03-13 16:04:12 -07001055 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1056 makex25->calluserdata.cudlength = skb->len;
Shaun Pereiracb65d502005-06-22 22:15:01 -07001057
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 sk->sk_ack_backlog++;
1059
1060 x25_insert_socket(make);
1061
1062 skb_queue_head(&sk->sk_receive_queue, skb);
1063
1064 x25_start_heartbeat(make);
1065
1066 if (!sock_flag(sk, SOCK_DEAD))
David S. Miller676d2362014-04-11 16:15:36 -04001067 sk->sk_data_ready(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 rc = 1;
1069 sock_put(sk);
1070out:
1071 return rc;
1072out_sock_put:
1073 sock_put(sk);
1074out_clear_request:
1075 rc = 0;
1076 x25_transmit_clear_request(nb, lci, 0x01);
1077 goto out;
1078}
1079
Ying Xue1b784142015-03-02 15:37:48 +08001080static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081{
1082 struct sock *sk = sock->sk;
1083 struct x25_sock *x25 = x25_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001084 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 struct sockaddr_x25 sx25;
1086 struct sk_buff *skb;
1087 unsigned char *asmptr;
1088 int noblock = msg->msg_flags & MSG_DONTWAIT;
1089 size_t size;
1090 int qbit = 0, rc = -EINVAL;
1091
Arnd Bergmann77b22832011-01-22 23:44:59 +01001092 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1094 goto out;
1095
1096 /* we currently don't support segmented records at the user interface */
1097 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1098 goto out;
1099
1100 rc = -EADDRNOTAVAIL;
1101 if (sock_flag(sk, SOCK_ZAPPED))
1102 goto out;
1103
1104 rc = -EPIPE;
1105 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1106 send_sig(SIGPIPE, current, 0);
1107 goto out;
1108 }
1109
1110 rc = -ENETUNREACH;
1111 if (!x25->neighbour)
1112 goto out;
1113
1114 if (usx25) {
1115 rc = -EINVAL;
1116 if (msg->msg_namelen < sizeof(sx25))
1117 goto out;
1118 memcpy(&sx25, usx25, sizeof(sx25));
1119 rc = -EISCONN;
1120 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1121 goto out;
1122 rc = -EINVAL;
1123 if (sx25.sx25_family != AF_X25)
1124 goto out;
1125 } else {
1126 /*
1127 * FIXME 1003.1g - if the socket is like this because
1128 * it has become closed (not started closed) we ought
1129 * to SIGPIPE, EPIPE;
1130 */
1131 rc = -ENOTCONN;
1132 if (sk->sk_state != TCP_ESTABLISHED)
1133 goto out;
1134
1135 sx25.sx25_family = AF_X25;
1136 sx25.sx25_addr = x25->dest_addr;
1137 }
1138
Alan Cox83e0bbc2009-03-27 00:28:21 -07001139 /* Sanity check the packet size */
1140 if (len > 65535) {
1141 rc = -EMSGSIZE;
1142 goto out;
1143 }
1144
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1146
1147 /* Build a packet */
1148 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1149
1150 if ((msg->msg_flags & MSG_OOB) && len > 32)
1151 len = 32;
1152
1153 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1154
Arnd Bergmann77b22832011-01-22 23:44:59 +01001155 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
Arnd Bergmann77b22832011-01-22 23:44:59 +01001157 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 if (!skb)
1159 goto out;
1160 X25_SKB_CB(skb)->flags = msg->msg_flags;
1161
1162 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1163
1164 /*
1165 * Put the data on the end
1166 */
1167 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1168
Arnaldo Carvalho de Meloeeeb0372007-03-14 21:04:34 -03001169 skb_reset_transport_header(skb);
1170 skb_put(skb, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171
Al Viro6ce8e9c2014-04-06 21:25:44 -04001172 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 if (rc)
1174 goto out_kfree_skb;
1175
1176 /*
1177 * If the Q BIT Include socket option is in force, the first
1178 * byte of the user data is the logical value of the Q Bit.
1179 */
andrew hendrycb863ff2010-05-16 22:59:41 +00001180 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
Matthew Daleycb101ed2011-10-14 18:45:04 +00001181 if (!pskb_may_pull(skb, 1))
1182 goto out_kfree_skb;
1183
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 qbit = skb->data[0];
1185 skb_pull(skb, 1);
1186 }
1187
1188 /*
1189 * Push down the X.25 header
1190 */
1191 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1192
1193 if (msg->msg_flags & MSG_OOB) {
1194 if (x25->neighbour->extended) {
1195 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1196 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1197 *asmptr++ = (x25->lci >> 0) & 0xFF;
1198 *asmptr++ = X25_INTERRUPT;
1199 } else {
1200 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1201 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1202 *asmptr++ = (x25->lci >> 0) & 0xFF;
1203 *asmptr++ = X25_INTERRUPT;
1204 }
1205 } else {
1206 if (x25->neighbour->extended) {
1207 /* Build an Extended X.25 header */
1208 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1209 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1210 *asmptr++ = (x25->lci >> 0) & 0xFF;
1211 *asmptr++ = X25_DATA;
1212 *asmptr++ = X25_DATA;
1213 } else {
1214 /* Build an Standard X.25 header */
1215 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1216 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1217 *asmptr++ = (x25->lci >> 0) & 0xFF;
1218 *asmptr++ = X25_DATA;
1219 }
1220
1221 if (qbit)
1222 skb->data[0] |= X25_Q_BIT;
1223 }
1224
1225 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1226 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1227
1228 rc = -ENOTCONN;
1229 if (sk->sk_state != TCP_ESTABLISHED)
1230 goto out_kfree_skb;
1231
1232 if (msg->msg_flags & MSG_OOB)
1233 skb_queue_tail(&x25->interrupt_out_queue, skb);
1234 else {
Roel Kluin8db09f22009-03-13 16:04:12 -07001235 rc = x25_output(sk, skb);
1236 len = rc;
1237 if (rc < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 kfree_skb(skb);
andrew hendrycb863ff2010-05-16 22:59:41 +00001239 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 len++;
1241 }
1242
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 x25_kick(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 rc = len;
1245out:
Arnd Bergmann77b22832011-01-22 23:44:59 +01001246 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 return rc;
1248out_kfree_skb:
1249 kfree_skb(skb);
1250 goto out;
1251}
1252
1253
Ying Xue1b784142015-03-02 15:37:48 +08001254static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 int flags)
1256{
1257 struct sock *sk = sock->sk;
1258 struct x25_sock *x25 = x25_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001259 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 size_t copied;
Dave Jones501e89d2011-11-01 16:26:44 +00001261 int qbit, header_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 struct sk_buff *skb;
1263 unsigned char *asmptr;
1264 int rc = -ENOTCONN;
1265
Arnd Bergmann77b22832011-01-22 23:44:59 +01001266 lock_sock(sk);
Dave Jones501e89d2011-11-01 16:26:44 +00001267
1268 if (x25->neighbour == NULL)
1269 goto out;
1270
1271 header_len = x25->neighbour->extended ?
1272 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1273
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 /*
1275 * This works for seqpacket too. The receiver has ordered the queue for
1276 * us! We do one quick check first though
1277 */
1278 if (sk->sk_state != TCP_ESTABLISHED)
1279 goto out;
1280
1281 if (flags & MSG_OOB) {
1282 rc = -EINVAL;
1283 if (sock_flag(sk, SOCK_URGINLINE) ||
1284 !skb_peek(&x25->interrupt_in_queue))
1285 goto out;
1286
1287 skb = skb_dequeue(&x25->interrupt_in_queue);
1288
Matthew Daleycb101ed2011-10-14 18:45:04 +00001289 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1290 goto out_free_dgram;
1291
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 skb_pull(skb, X25_STD_MIN_LEN);
1293
1294 /*
1295 * No Q bit information on Interrupt data.
1296 */
andrew hendrycb863ff2010-05-16 22:59:41 +00001297 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 asmptr = skb_push(skb, 1);
1299 *asmptr = 0x00;
1300 }
1301
1302 msg->msg_flags |= MSG_OOB;
1303 } else {
1304 /* Now we can treat all alike */
Arnd Bergmann77b22832011-01-22 23:44:59 +01001305 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1307 flags & MSG_DONTWAIT, &rc);
Arnd Bergmann77b22832011-01-22 23:44:59 +01001308 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 if (!skb)
1310 goto out;
1311
Matthew Daleycb101ed2011-10-14 18:45:04 +00001312 if (!pskb_may_pull(skb, header_len))
1313 goto out_free_dgram;
1314
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1316
Matthew Daleycb101ed2011-10-14 18:45:04 +00001317 skb_pull(skb, header_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318
andrew hendrycb863ff2010-05-16 22:59:41 +00001319 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 asmptr = skb_push(skb, 1);
1321 *asmptr = qbit;
1322 }
1323 }
1324
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001325 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 copied = skb->len;
1327
1328 if (copied > size) {
1329 copied = size;
1330 msg->msg_flags |= MSG_TRUNC;
1331 }
1332
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +09001333 /* Currently, each datagram always contains a complete record */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 msg->msg_flags |= MSG_EOR;
1335
David S. Miller51f3d022014-11-05 16:46:40 -05001336 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 if (rc)
1338 goto out_free_dgram;
1339
1340 if (sx25) {
1341 sx25->sx25_family = AF_X25;
1342 sx25->sx25_addr = x25->dest_addr;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001343 msg->msg_namelen = sizeof(*sx25);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 }
1345
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 x25_check_rbuf(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 rc = copied;
1348out_free_dgram:
1349 skb_free_datagram(sk, skb);
1350out:
Arnd Bergmann77b22832011-01-22 23:44:59 +01001351 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 return rc;
1353}
1354
1355
1356static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1357{
1358 struct sock *sk = sock->sk;
1359 struct x25_sock *x25 = x25_sk(sk);
1360 void __user *argp = (void __user *)arg;
1361 int rc;
1362
1363 switch (cmd) {
Joe Perchesfddc5f32011-07-01 09:43:13 +00001364 case TIOCOUTQ: {
1365 int amount;
Eric Dumazet31e6d362009-06-17 19:05:41 -07001366
Joe Perchesfddc5f32011-07-01 09:43:13 +00001367 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1368 if (amount < 0)
1369 amount = 0;
1370 rc = put_user(amount, (unsigned int __user *)argp);
1371 break;
1372 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
Joe Perchesfddc5f32011-07-01 09:43:13 +00001374 case TIOCINQ: {
1375 struct sk_buff *skb;
1376 int amount = 0;
1377 /*
1378 * These two are safe on a single CPU system as
1379 * only user tasks fiddle here
1380 */
1381 lock_sock(sk);
1382 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1383 amount = skb->len;
1384 release_sock(sk);
1385 rc = put_user(amount, (unsigned int __user *)argp);
1386 break;
1387 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388
Joe Perchesfddc5f32011-07-01 09:43:13 +00001389 case SIOCGSTAMP:
1390 rc = -EINVAL;
1391 if (sk)
1392 rc = sock_get_timestamp(sk,
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +09001393 (struct timeval __user *)argp);
Joe Perchesfddc5f32011-07-01 09:43:13 +00001394 break;
1395 case SIOCGSTAMPNS:
1396 rc = -EINVAL;
1397 if (sk)
1398 rc = sock_get_timestampns(sk,
1399 (struct timespec __user *)argp);
1400 break;
1401 case SIOCGIFADDR:
1402 case SIOCSIFADDR:
1403 case SIOCGIFDSTADDR:
1404 case SIOCSIFDSTADDR:
1405 case SIOCGIFBRDADDR:
1406 case SIOCSIFBRDADDR:
1407 case SIOCGIFNETMASK:
1408 case SIOCSIFNETMASK:
1409 case SIOCGIFMETRIC:
1410 case SIOCSIFMETRIC:
1411 rc = -EINVAL;
1412 break;
1413 case SIOCADDRT:
1414 case SIOCDELRT:
1415 rc = -EPERM;
1416 if (!capable(CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 break;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001418 rc = x25_route_ioctl(cmd, argp);
1419 break;
1420 case SIOCX25GSUBSCRIP:
1421 rc = x25_subscr_ioctl(cmd, argp);
1422 break;
1423 case SIOCX25SSUBSCRIP:
1424 rc = -EPERM;
1425 if (!capable(CAP_NET_ADMIN))
Eric Dumazetae40eb12007-03-18 17:33:16 -07001426 break;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001427 rc = x25_subscr_ioctl(cmd, argp);
1428 break;
1429 case SIOCX25GFACILITIES: {
1430 lock_sock(sk);
1431 rc = copy_to_user(argp, &x25->facilities,
1432 sizeof(x25->facilities))
1433 ? -EFAULT : 0;
1434 release_sock(sk);
1435 break;
1436 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
Joe Perchesfddc5f32011-07-01 09:43:13 +00001438 case SIOCX25SFACILITIES: {
1439 struct x25_facilities facilities;
1440 rc = -EFAULT;
1441 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1442 break;
1443 rc = -EINVAL;
1444 lock_sock(sk);
1445 if (sk->sk_state != TCP_LISTEN &&
1446 sk->sk_state != TCP_CLOSE)
1447 goto out_fac_release;
1448 if (facilities.pacsize_in < X25_PS16 ||
1449 facilities.pacsize_in > X25_PS4096)
1450 goto out_fac_release;
1451 if (facilities.pacsize_out < X25_PS16 ||
1452 facilities.pacsize_out > X25_PS4096)
1453 goto out_fac_release;
1454 if (facilities.winsize_in < 1 ||
1455 facilities.winsize_in > 127)
1456 goto out_fac_release;
1457 if (facilities.throughput) {
1458 int out = facilities.throughput & 0xf0;
1459 int in = facilities.throughput & 0x0f;
1460 if (!out)
1461 facilities.throughput |=
1462 X25_DEFAULT_THROUGHPUT << 4;
1463 else if (out < 0x30 || out > 0xD0)
andrew hendryf90de662010-11-25 02:18:35 +00001464 goto out_fac_release;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001465 if (!in)
1466 facilities.throughput |=
1467 X25_DEFAULT_THROUGHPUT;
1468 else if (in < 0x03 || in > 0x0D)
andrew hendryf90de662010-11-25 02:18:35 +00001469 goto out_fac_release;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001470 }
1471 if (facilities.reverse &&
1472 (facilities.reverse & 0x81) != 0x81)
1473 goto out_fac_release;
1474 x25->facilities = facilities;
1475 rc = 0;
andrew hendryf90de662010-11-25 02:18:35 +00001476out_fac_release:
Joe Perchesfddc5f32011-07-01 09:43:13 +00001477 release_sock(sk);
1478 break;
1479 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
Joe Perchesfddc5f32011-07-01 09:43:13 +00001481 case SIOCX25GDTEFACILITIES: {
1482 lock_sock(sk);
1483 rc = copy_to_user(argp, &x25->dte_facilities,
1484 sizeof(x25->dte_facilities));
1485 release_sock(sk);
1486 if (rc)
YOSHIFUJI Hideakif8e1d2012007-02-09 23:25:27 +09001487 rc = -EFAULT;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001488 break;
1489 }
1490
1491 case SIOCX25SDTEFACILITIES: {
1492 struct x25_dte_facilities dtefacs;
1493 rc = -EFAULT;
1494 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1495 break;
1496 rc = -EINVAL;
1497 lock_sock(sk);
1498 if (sk->sk_state != TCP_LISTEN &&
1499 sk->sk_state != TCP_CLOSE)
1500 goto out_dtefac_release;
1501 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1502 goto out_dtefac_release;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001503 if (dtefacs.called_len > X25_MAX_AE_LEN)
1504 goto out_dtefac_release;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001505 x25->dte_facilities = dtefacs;
1506 rc = 0;
andrew hendryf90de662010-11-25 02:18:35 +00001507out_dtefac_release:
Joe Perchesfddc5f32011-07-01 09:43:13 +00001508 release_sock(sk);
1509 break;
1510 }
1511
1512 case SIOCX25GCALLUSERDATA: {
1513 lock_sock(sk);
1514 rc = copy_to_user(argp, &x25->calluserdata,
1515 sizeof(x25->calluserdata))
1516 ? -EFAULT : 0;
1517 release_sock(sk);
1518 break;
1519 }
1520
1521 case SIOCX25SCALLUSERDATA: {
1522 struct x25_calluserdata calluserdata;
1523
1524 rc = -EFAULT;
1525 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
Shaun Pereiraa64b7b92006-03-22 00:01:31 -08001526 break;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001527 rc = -EINVAL;
1528 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 break;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001530 lock_sock(sk);
1531 x25->calluserdata = calluserdata;
1532 release_sock(sk);
1533 rc = 0;
1534 break;
1535 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536
Joe Perchesfddc5f32011-07-01 09:43:13 +00001537 case SIOCX25GCAUSEDIAG: {
1538 lock_sock(sk);
1539 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1540 ? -EFAULT : 0;
1541 release_sock(sk);
1542 break;
1543 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544
Joe Perchesfddc5f32011-07-01 09:43:13 +00001545 case SIOCX25SCAUSEDIAG: {
1546 struct x25_causediag causediag;
1547 rc = -EFAULT;
1548 if (copy_from_user(&causediag, argp, sizeof(causediag)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 break;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001550 lock_sock(sk);
1551 x25->causediag = causediag;
1552 release_sock(sk);
1553 rc = 0;
1554 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Joe Perchesfddc5f32011-07-01 09:43:13 +00001556 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557
Joe Perchesfddc5f32011-07-01 09:43:13 +00001558 case SIOCX25SCUDMATCHLEN: {
1559 struct x25_subaddr sub_addr;
1560 rc = -EINVAL;
1561 lock_sock(sk);
1562 if(sk->sk_state != TCP_CLOSE)
1563 goto out_cud_release;
1564 rc = -EFAULT;
1565 if (copy_from_user(&sub_addr, argp,
1566 sizeof(sub_addr)))
1567 goto out_cud_release;
1568 rc = -EINVAL;
1569 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1570 goto out_cud_release;
1571 x25->cudmatchlength = sub_addr.cudmatchlength;
1572 rc = 0;
andrew hendry3f0a0692010-11-25 02:18:45 +00001573out_cud_release:
Joe Perchesfddc5f32011-07-01 09:43:13 +00001574 release_sock(sk);
1575 break;
1576 }
Shaun Pereiracb65d502005-06-22 22:15:01 -07001577
Joe Perchesfddc5f32011-07-01 09:43:13 +00001578 case SIOCX25CALLACCPTAPPRV: {
1579 rc = -EINVAL;
1580 lock_sock(sk);
Dave Jones4ccb93c2013-06-28 12:13:52 -04001581 if (sk->sk_state == TCP_CLOSE) {
1582 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1583 rc = 0;
1584 }
Joe Perchesfddc5f32011-07-01 09:43:13 +00001585 release_sock(sk);
Joe Perchesfddc5f32011-07-01 09:43:13 +00001586 break;
1587 }
Shaun Pereiraebc3f642005-06-22 22:16:17 -07001588
Joe Perchesfddc5f32011-07-01 09:43:13 +00001589 case SIOCX25SENDCALLACCPT: {
1590 rc = -EINVAL;
1591 lock_sock(sk);
1592 if (sk->sk_state != TCP_ESTABLISHED)
Dave Jones4ccb93c2013-06-28 12:13:52 -04001593 goto out_sendcallaccpt_release;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001594 /* must call accptapprv above */
1595 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
Dave Jones4ccb93c2013-06-28 12:13:52 -04001596 goto out_sendcallaccpt_release;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001597 x25_write_internal(sk, X25_CALL_ACCEPTED);
1598 x25->state = X25_STATE_3;
Joe Perchesfddc5f32011-07-01 09:43:13 +00001599 rc = 0;
Dave Jones4ccb93c2013-06-28 12:13:52 -04001600out_sendcallaccpt_release:
1601 release_sock(sk);
Joe Perchesfddc5f32011-07-01 09:43:13 +00001602 break;
1603 }
Shaun Pereiraebc3f642005-06-22 22:16:17 -07001604
Joe Perchesfddc5f32011-07-01 09:43:13 +00001605 default:
1606 rc = -ENOIOCTLCMD;
1607 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 }
1609
1610 return rc;
1611}
1612
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00001613static const struct net_proto_family x25_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 .family = AF_X25,
1615 .create = x25_create,
1616 .owner = THIS_MODULE,
1617};
1618
Shaun Pereira1b06e6b2006-03-22 00:00:12 -08001619#ifdef CONFIG_COMPAT
1620static int compat_x25_subscr_ioctl(unsigned int cmd,
1621 struct compat_x25_subscrip_struct __user *x25_subscr32)
1622{
1623 struct compat_x25_subscrip_struct x25_subscr;
1624 struct x25_neigh *nb;
1625 struct net_device *dev;
1626 int rc = -EINVAL;
1627
1628 rc = -EFAULT;
1629 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1630 goto out;
1631
1632 rc = -EINVAL;
1633 dev = x25_dev_get(x25_subscr.device);
1634 if (dev == NULL)
1635 goto out;
1636
1637 nb = x25_get_neigh(dev);
1638 if (nb == NULL)
1639 goto out_dev_put;
1640
1641 dev_put(dev);
1642
1643 if (cmd == SIOCX25GSUBSCRIP) {
andrew hendry5595a1a2010-11-25 02:18:15 +00001644 read_lock_bh(&x25_neigh_list_lock);
Shaun Pereira1b06e6b2006-03-22 00:00:12 -08001645 x25_subscr.extended = nb->extended;
1646 x25_subscr.global_facil_mask = nb->global_facil_mask;
andrew hendry5595a1a2010-11-25 02:18:15 +00001647 read_unlock_bh(&x25_neigh_list_lock);
Shaun Pereira1b06e6b2006-03-22 00:00:12 -08001648 rc = copy_to_user(x25_subscr32, &x25_subscr,
1649 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1650 } else {
1651 rc = -EINVAL;
1652 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1653 rc = 0;
andrew hendry5595a1a2010-11-25 02:18:15 +00001654 write_lock_bh(&x25_neigh_list_lock);
Shaun Pereira1b06e6b2006-03-22 00:00:12 -08001655 nb->extended = x25_subscr.extended;
1656 nb->global_facil_mask = x25_subscr.global_facil_mask;
andrew hendry5595a1a2010-11-25 02:18:15 +00001657 write_unlock_bh(&x25_neigh_list_lock);
Shaun Pereira1b06e6b2006-03-22 00:00:12 -08001658 }
1659 }
1660 x25_neigh_put(nb);
1661out:
1662 return rc;
1663out_dev_put:
1664 dev_put(dev);
1665 goto out;
1666}
1667
1668static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1669 unsigned long arg)
1670{
1671 void __user *argp = compat_ptr(arg);
1672 struct sock *sk = sock->sk;
1673
1674 int rc = -ENOIOCTLCMD;
1675
1676 switch(cmd) {
1677 case TIOCOUTQ:
1678 case TIOCINQ:
1679 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1680 break;
1681 case SIOCGSTAMP:
1682 rc = -EINVAL;
1683 if (sk)
1684 rc = compat_sock_get_timestamp(sk,
1685 (struct timeval __user*)argp);
1686 break;
Eric Dumazetae40eb12007-03-18 17:33:16 -07001687 case SIOCGSTAMPNS:
1688 rc = -EINVAL;
1689 if (sk)
1690 rc = compat_sock_get_timestampns(sk,
1691 (struct timespec __user*)argp);
1692 break;
Shaun Pereira1b06e6b2006-03-22 00:00:12 -08001693 case SIOCGIFADDR:
1694 case SIOCSIFADDR:
1695 case SIOCGIFDSTADDR:
1696 case SIOCSIFDSTADDR:
1697 case SIOCGIFBRDADDR:
1698 case SIOCSIFBRDADDR:
1699 case SIOCGIFNETMASK:
1700 case SIOCSIFNETMASK:
1701 case SIOCGIFMETRIC:
1702 case SIOCSIFMETRIC:
1703 rc = -EINVAL;
1704 break;
1705 case SIOCADDRT:
1706 case SIOCDELRT:
1707 rc = -EPERM;
1708 if (!capable(CAP_NET_ADMIN))
1709 break;
1710 rc = x25_route_ioctl(cmd, argp);
1711 break;
1712 case SIOCX25GSUBSCRIP:
1713 rc = compat_x25_subscr_ioctl(cmd, argp);
1714 break;
1715 case SIOCX25SSUBSCRIP:
1716 rc = -EPERM;
1717 if (!capable(CAP_NET_ADMIN))
1718 break;
1719 rc = compat_x25_subscr_ioctl(cmd, argp);
1720 break;
1721 case SIOCX25GFACILITIES:
1722 case SIOCX25SFACILITIES:
Shaun Pereira9a6b9f22006-03-22 00:02:00 -08001723 case SIOCX25GDTEFACILITIES:
1724 case SIOCX25SDTEFACILITIES:
Shaun Pereira1b06e6b2006-03-22 00:00:12 -08001725 case SIOCX25GCALLUSERDATA:
1726 case SIOCX25SCALLUSERDATA:
1727 case SIOCX25GCAUSEDIAG:
Andrew Hendry386e50c2009-11-18 23:30:41 -08001728 case SIOCX25SCAUSEDIAG:
Shaun Pereira1b06e6b2006-03-22 00:00:12 -08001729 case SIOCX25SCUDMATCHLEN:
1730 case SIOCX25CALLACCPTAPPRV:
1731 case SIOCX25SENDCALLACCPT:
1732 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1733 break;
1734 default:
1735 rc = -ENOIOCTLCMD;
1736 break;
1737 }
1738 return rc;
1739}
1740#endif
1741
Arnd Bergmann91774902009-11-05 04:37:29 +00001742static const struct proto_ops x25_proto_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 .family = AF_X25,
1744 .owner = THIS_MODULE,
1745 .release = x25_release,
1746 .bind = x25_bind,
1747 .connect = x25_connect,
1748 .socketpair = sock_no_socketpair,
1749 .accept = x25_accept,
1750 .getname = x25_getname,
andrew hendry768190f2010-09-21 15:24:45 +00001751 .poll = datagram_poll,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 .ioctl = x25_ioctl,
Shaun Pereira1b06e6b2006-03-22 00:00:12 -08001753#ifdef CONFIG_COMPAT
1754 .compat_ioctl = compat_x25_ioctl,
1755#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 .listen = x25_listen,
1757 .shutdown = sock_no_shutdown,
1758 .setsockopt = x25_setsockopt,
1759 .getsockopt = x25_getsockopt,
1760 .sendmsg = x25_sendmsg,
1761 .recvmsg = x25_recvmsg,
1762 .mmap = sock_no_mmap,
1763 .sendpage = sock_no_sendpage,
1764};
1765
Stephen Hemminger7546dd92009-03-09 08:18:29 +00001766static struct packet_type x25_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -08001767 .type = cpu_to_be16(ETH_P_X25),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 .func = x25_lapb_receive_frame,
1769};
1770
1771static struct notifier_block x25_dev_notifier = {
1772 .notifier_call = x25_device_event,
1773};
1774
1775void x25_kill_by_neigh(struct x25_neigh *nb)
1776{
1777 struct sock *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778
1779 write_lock_bh(&x25_list_lock);
1780
Sasha Levinb67bfe02013-02-27 17:06:00 -08001781 sk_for_each(s, &x25_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782 if (x25_sk(s)->neighbour == nb)
1783 x25_disconnect(s, ENETUNREACH, 0, 0);
1784
1785 write_unlock_bh(&x25_list_lock);
Andrew Hendry95a9dc42007-02-08 13:34:02 -08001786
1787 /* Remove any related forwards */
1788 x25_clear_forward_by_dev(nb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789}
1790
1791static int __init x25_init(void)
1792{
linzhang53678832017-05-17 12:05:07 +08001793 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794
linzhang53678832017-05-17 12:05:07 +08001795 rc = proto_register(&x25_proto, 0);
1796 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 goto out;
1798
andrew hendry1fd975a2009-11-24 15:15:42 +00001799 rc = sock_register(&x25_family_ops);
linzhang53678832017-05-17 12:05:07 +08001800 if (rc)
andrew hendry1fd975a2009-11-24 15:15:42 +00001801 goto out_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802
1803 dev_add_pack(&x25_packet_type);
1804
andrew hendry1fd975a2009-11-24 15:15:42 +00001805 rc = register_netdevice_notifier(&x25_dev_notifier);
linzhang53678832017-05-17 12:05:07 +08001806 if (rc)
andrew hendry1fd975a2009-11-24 15:15:42 +00001807 goto out_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808
linzhang53678832017-05-17 12:05:07 +08001809 rc = x25_register_sysctl();
1810 if (rc)
1811 goto out_dev;
1812
1813 rc = x25_proc_init();
1814 if (rc)
1815 goto out_sysctl;
1816
wangweidongb73e9e32013-12-06 19:24:33 +08001817 pr_info("Linux Version 0.2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819out:
1820 return rc;
linzhang53678832017-05-17 12:05:07 +08001821out_sysctl:
1822 x25_unregister_sysctl();
andrew hendry1fd975a2009-11-24 15:15:42 +00001823out_dev:
1824 unregister_netdevice_notifier(&x25_dev_notifier);
1825out_sock:
linzhang53678832017-05-17 12:05:07 +08001826 dev_remove_pack(&x25_packet_type);
andrew hendry1fd975a2009-11-24 15:15:42 +00001827 sock_unregister(AF_X25);
1828out_proto:
1829 proto_unregister(&x25_proto);
1830 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831}
1832module_init(x25_init);
1833
1834static void __exit x25_exit(void)
1835{
1836 x25_proc_exit();
1837 x25_link_free();
1838 x25_route_free();
1839
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 x25_unregister_sysctl();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841
1842 unregister_netdevice_notifier(&x25_dev_notifier);
1843
1844 dev_remove_pack(&x25_packet_type);
1845
1846 sock_unregister(AF_X25);
1847 proto_unregister(&x25_proto);
1848}
1849module_exit(x25_exit);
1850
1851MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1852MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1853MODULE_LICENSE("GPL");
1854MODULE_ALIAS_NETPROTO(PF_X25);