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Merge tag 'iommu-fix-v5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/joro...
[thirdparty/kernel/stable.git] / net / x25 / af_x25.c
CommitLineData
1da177e4
LT		 1/*
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
f8e1d201 6 * screw up. It might even work.
1da177e4
LT		 7 *
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.
f8e1d201
YH		 21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
22 * facilities negotiation and increased
1da177e4
LT		 23 * the throughput upper limit.
24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
f8e1d201 25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
1da177e4
LT		 26 * 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
cb65d506
SP		 32 * 2005-04-02 Shaun Pereira Selective sub address matching
33 * with call user data
ebc3f64b
SP		 34 * 2005-04-15 Shaun Pereira Fast select with no restriction on
35 * response
1da177e4
LT		 36 */
37
b73e9e3c 38#define pr_fmt(fmt) "X25: " fmt
39
1da177e4 40#include <linux/module.h>
4fc268d2 41#include <linux/capability.h>
1da177e4
LT		 42#include <linux/errno.h>
43#include <linux/kernel.h>
3f07c014 44#include <linux/sched/signal.h>
1da177e4
LT		 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>
5a0e3ad6 51#include <linux/slab.h>
1da177e4 52#include <net/sock.h>
c752f073 53#include <net/tcp_states.h>
7c0f6ba6 54#include <linux/uaccess.h>
1da177e4
LT		 55#include <linux/fcntl.h>
56#include <linux/termios.h> /* For TIOCINQ/OUTQ */
57#include <linux/notifier.h>
58#include <linux/init.h>
1b06e6ba 59#include <linux/compat.h>
a9288525 60#include <linux/ctype.h>
1b06e6ba 61
1da177e4 62#include <net/x25.h>
1b06e6ba 63#include <net/compat.h>
1da177e4
LT		 64
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;
39e21c0d 70int sysctl_x25_forward = 0;
1da177e4
LT		 71
72HLIST_HEAD(x25_list);
73DEFINE_RWLOCK(x25_list_lock);
74
90ddc4f0 75static const struct proto_ops x25_proto_ops;
1da177e4 76
e9e6c232 77static const struct x25_address null_x25_address = {" "};
1da177e4 78
1b06e6ba
SP		 79#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
f5eb917b
JH		 87
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
cb101ed2 96 if (!pskb_may_pull(skb, 1)) {
f5eb917b
JH		 97 /* packet has no address block */
98 rc = 0;
99 goto empty;
100 }
101
102 len = *skb->data;
d449ba3d 103 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
f5eb917b 104
cb101ed2 105 if (!pskb_may_pull(skb, needed)) {
f5eb917b
JH		 106 /* 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
1da177e4
LT		 122int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
123 struct x25_address *calling_addr)
124{
6bf1574e 125 unsigned int called_len, calling_len;
1da177e4 126 char *called, *calling;
6bf1574e 127 unsigned int i;
1da177e4
LT		 128
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;
1da177e4
LT		 213
214 write_lock_bh(&x25_list_lock);
215
b67bfe0d 216 sk_for_each(s, &x25_list)
1da177e4
LT		 217 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{
351638e7 229 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1da177e4
LT		 230 struct x25_neigh *nb;
231
721499e8 232 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB		 233 return NOTIFY_DONE;
234
1da177e4 235 if (dev->type == ARPHRD_X25
29c36262 236#if IS_ENABLED(CONFIG_LLC)
1da177e4
LT		 237 || dev->type == ARPHRD_ETHER
238#endif
239 ) {
240 switch (event) {
fddc5f3e
JP		 241 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;
1da177e4
LT		 256 }
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 */
cb65d506
SP		 279static struct sock *x25_find_listener(struct x25_address *addr,
280 struct sk_buff *skb)
1da177e4
LT		 281{
282 struct sock *s;
283 struct sock *next_best;
1da177e4
LT		 284
285 read_lock_bh(&x25_list_lock);
286 next_best = NULL;
287
b67bfe0d 288 sk_for_each(s, &x25_list)
1da177e4 289 if ((!strcmp(addr->x25_addr,
cb65d506 290 x25_sk(s)->source_addr.x25_addr) ||
06137619 291 !strcmp(x25_sk(s)->source_addr.x25_addr,
cb65d506
SP		 292 null_x25_address.x25_addr)) &&
293 s->sk_state == TCP_LISTEN) {
1da177e4
LT		 294 /*
295 * Found a listening socket, now check the incoming
296 * call user data vs this sockets call user data
297 */
7f81e25b
MD		 298 if (x25_sk(s)->cudmatchlength > 0 &&
299 skb->len >= x25_sk(s)->cudmatchlength) {
f8e1d201
YH		 300 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301 skb->data,
cb65d506
SP		 302 x25_sk(s)->cudmatchlength)) == 0) {
303 sock_hold(s);
304 goto found;
305 }
306 } else
1da177e4 307 next_best = s;
1da177e4
LT		 308 }
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;
1da177e4 326
b67bfe0d 327 sk_for_each(s, &x25_list)
1da177e4
LT		 328 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
cf657d22 355 while ((sk = x25_find_socket(lci, nb)) != NULL) {
1da177e4
LT		 356 sock_put(sk);
357 if (++lci == 4096) {
358 lci = 0;
359 break;
360 }
cf657d22 361 cond_resched();
1da177e4
LT		 362 }
363
1da177e4
LT		 364 return lci;
365}
366
367/*
368 * Deferred destroy.
369 */
14ebaf81 370static void __x25_destroy_socket(struct sock *);
1da177e4
LT		 371
372/*
373 * handler for deferred kills.
374 */
99767f27 375static void x25_destroy_timer(struct timer_list *t)
1da177e4 376{
99767f27
KC		 377 struct sock *sk = from_timer(sk, t, sk_timer);
378
379 x25_destroy_socket_from_timer(sk);
1da177e4
LT		 380}
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 */
14ebaf81 389static void __x25_destroy_socket(struct sock *sk)
1da177e4
LT		 390{
391 struct sk_buff *skb;
392
1da177e4
LT		 393 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 */
2cec6b01 404 skb->sk->sk_state = TCP_LISTEN;
1da177e4
LT		 405 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
c564039f 413 if (sk_has_allocations(sk)) {
1da177e4
LT		 414 /* Defer: outstanding buffers */
415 sk->sk_timer.expires = jiffies + 10 * HZ;
841b86f3 416 sk->sk_timer.function = x25_destroy_timer;
1da177e4
LT		 417 add_timer(&sk->sk_timer);
418 } else {
419 /* drop last reference so sock_put will free */
420 __sock_put(sk);
421 }
14ebaf81 422}
1da177e4 423
14ebaf81
DM		 424void x25_destroy_socket_from_timer(struct sock *sk)
425{
426 sock_hold(sk);
427 bh_lock_sock(sk);
428 __x25_destroy_socket(sk);
429 bh_unlock_sock(sk);
430 sock_put(sk);
431}
432
1da177e4
LT		 433/*
434 * Handling for system calls applied via the various interfaces to a
435 * X.25 socket object.
436 */
437
438static int x25_setsockopt(struct socket *sock, int level, int optname,
b7058842 439 char __user *optval, unsigned int optlen)
1da177e4
LT		 440{
441 int opt;
442 struct sock *sk = sock->sk;
443 int rc = -ENOPROTOOPT;
444
445 if (level != SOL_X25 || optname != X25_QBITINCL)
446 goto out;
447
448 rc = -EINVAL;
449 if (optlen < sizeof(int))
450 goto out;
451
452 rc = -EFAULT;
453 if (get_user(opt, (int __user *)optval))
454 goto out;
455
cb863ffd 456 if (opt)
457 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
458 else
459 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 460 rc = 0;
461out:
462 return rc;
463}
464
465static int x25_getsockopt(struct socket *sock, int level, int optname,
466 char __user *optval, int __user *optlen)
467{
468 struct sock *sk = sock->sk;
469 int val, len, rc = -ENOPROTOOPT;
f8e1d201 470
1da177e4
LT		 471 if (level != SOL_X25 || optname != X25_QBITINCL)
472 goto out;
473
474 rc = -EFAULT;
475 if (get_user(len, optlen))
476 goto out;
477
478 len = min_t(unsigned int, len, sizeof(int));
479
480 rc = -EINVAL;
481 if (len < 0)
482 goto out;
f8e1d201 483
1da177e4
LT		 484 rc = -EFAULT;
485 if (put_user(len, optlen))
486 goto out;
487
cb863ffd 488 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 489 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
490out:
491 return rc;
492}
493
494static int x25_listen(struct socket *sock, int backlog)
495{
496 struct sock *sk = sock->sk;
497 int rc = -EOPNOTSUPP;
498
25aa4efe 499 lock_sock(sk);
1da177e4
LT		 500 if (sk->sk_state != TCP_LISTEN) {
501 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
502 sk->sk_max_ack_backlog = backlog;
503 sk->sk_state = TCP_LISTEN;
504 rc = 0;
505 }
25aa4efe 506 release_sock(sk);
1da177e4
LT		 507
508 return rc;
509}
510
511static struct proto x25_proto = {
512 .name = "X25",
513 .owner = THIS_MODULE,
514 .obj_size = sizeof(struct x25_sock),
515};
516
11aa9c28 517static struct sock *x25_alloc_socket(struct net *net, int kern)
1da177e4
LT		 518{
519 struct x25_sock *x25;
11aa9c28 520 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
1da177e4
LT		 521
522 if (!sk)
523 goto out;
524
525 sock_init_data(NULL, sk);
526
527 x25 = x25_sk(sk);
528 skb_queue_head_init(&x25->ack_queue);
529 skb_queue_head_init(&x25->fragment_queue);
530 skb_queue_head_init(&x25->interrupt_in_queue);
531 skb_queue_head_init(&x25->interrupt_out_queue);
532out:
533 return sk;
534}
535
3f378b68
EP		 536static int x25_create(struct net *net, struct socket *sock, int protocol,
537 int kern)
1da177e4
LT		 538{
539 struct sock *sk;
540 struct x25_sock *x25;
b18e7a06 541 int rc = -EAFNOSUPPORT;
1da177e4 542
09ad9bc7 543 if (!net_eq(net, &init_net))
b18e7a06 544 goto out;
545
546 rc = -ESOCKTNOSUPPORT;
547 if (sock->type != SOCK_SEQPACKET)
548 goto out;
1b8d7ae4 549
b18e7a06 550 rc = -EINVAL;
551 if (protocol)
1da177e4
LT		 552 goto out;
553
b18e7a06 554 rc = -ENOBUFS;
11aa9c28 555 if ((sk = x25_alloc_socket(net, kern)) == NULL)
1da177e4
LT		 556 goto out;
557
558 x25 = x25_sk(sk);
559
560 sock_init_data(sock, sk);
561
562 x25_init_timers(sk);
563
564 sock->ops = &x25_proto_ops;
565 sk->sk_protocol = protocol;
566 sk->sk_backlog_rcv = x25_backlog_rcv;
567
568 x25->t21 = sysctl_x25_call_request_timeout;
569 x25->t22 = sysctl_x25_reset_request_timeout;
570 x25->t23 = sysctl_x25_clear_request_timeout;
571 x25->t2 = sysctl_x25_ack_holdback_timeout;
572 x25->state = X25_STATE_0;
cb65d506 573 x25->cudmatchlength = 0;
37cda787 574 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
ebc3f64b 575 /* on call accept */
1da177e4
LT		 576
577 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
578 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
579 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
580 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
ddd0451f
JH		 581 x25->facilities.throughput = 0; /* by default don't negotiate
582 throughput */
1da177e4 583 x25->facilities.reverse = X25_DEFAULT_REVERSE;
f8e1d201
YH		 584 x25->dte_facilities.calling_len = 0;
585 x25->dte_facilities.called_len = 0;
586 memset(x25->dte_facilities.called_ae, '\0',
587 sizeof(x25->dte_facilities.called_ae));
588 memset(x25->dte_facilities.calling_ae, '\0',
589 sizeof(x25->dte_facilities.calling_ae));
a64b7b93 590
1da177e4
LT		 591 rc = 0;
592out:
593 return rc;
594}
595
596static struct sock *x25_make_new(struct sock *osk)
597{
598 struct sock *sk = NULL;
599 struct x25_sock *x25, *ox25;
600
601 if (osk->sk_type != SOCK_SEQPACKET)
602 goto out;
603
11aa9c28 604 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
1da177e4
LT		 605 goto out;
606
607 x25 = x25_sk(sk);
608
609 sk->sk_type = osk->sk_type;
1da177e4
LT		 610 sk->sk_priority = osk->sk_priority;
611 sk->sk_protocol = osk->sk_protocol;
612 sk->sk_rcvbuf = osk->sk_rcvbuf;
613 sk->sk_sndbuf = osk->sk_sndbuf;
614 sk->sk_state = TCP_ESTABLISHED;
1da177e4 615 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
a20a8554 616 sock_copy_flags(sk, osk);
1da177e4
LT		 617
618 ox25 = x25_sk(osk);
619 x25->t21 = ox25->t21;
620 x25->t22 = ox25->t22;
621 x25->t23 = ox25->t23;
622 x25->t2 = ox25->t2;
cb863ffd 623 x25->flags = ox25->flags;
1da177e4 624 x25->facilities = ox25->facilities;
a64b7b93 625 x25->dte_facilities = ox25->dte_facilities;
cb65d506 626 x25->cudmatchlength = ox25->cudmatchlength;
1da177e4 627
b7792e34 628 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
1da177e4
LT		 629 x25_init_timers(sk);
630out:
631 return sk;
632}
633
634static int x25_release(struct socket *sock)
635{
636 struct sock *sk = sock->sk;
637 struct x25_sock *x25;
638
639 if (!sk)
77b22836 640 return 0;
1da177e4
LT		 641
642 x25 = x25_sk(sk);
643
77b22836
AB		 644 sock_hold(sk);
645 lock_sock(sk);
1da177e4
LT		 646 switch (x25->state) {
647
648 case X25_STATE_0:
649 case X25_STATE_2:
650 x25_disconnect(sk, 0, 0, 0);
77b22836 651 __x25_destroy_socket(sk);
1da177e4
LT		 652 goto out;
653
654 case X25_STATE_1:
655 case X25_STATE_3:
656 case X25_STATE_4:
657 x25_clear_queues(sk);
658 x25_write_internal(sk, X25_CLEAR_REQUEST);
659 x25_start_t23timer(sk);
660 x25->state = X25_STATE_2;
661 sk->sk_state = TCP_CLOSE;
662 sk->sk_shutdown |= SEND_SHUTDOWN;
663 sk->sk_state_change(sk);
664 sock_set_flag(sk, SOCK_DEAD);
665 sock_set_flag(sk, SOCK_DESTROY);
666 break;
667 }
668
c751e4f8 669 sock_orphan(sk);
1da177e4 670out:
77b22836
AB		 671 release_sock(sk);
672 sock_put(sk);
1da177e4
LT		 673 return 0;
674}
675
676static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
677{
678 struct sock *sk = sock->sk;
679 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
a9288525 680 int len, i, rc = 0;
1da177e4 681
797a22bd 682 if (addr_len != sizeof(struct sockaddr_x25) ||
91774904
AB		 683 addr->sx25_family != AF_X25) {
684 rc = -EINVAL;
685 goto out;
686 }
1da177e4 687
06137619
MS		 688 /* check for the null_x25_address */
689 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
690
691 len = strlen(addr->sx25_addr.x25_addr);
692 for (i = 0; i < len; i++) {
693 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
694 rc = -EINVAL;
695 goto out;
696 }
a9288525 697 }
698 }
699
90c27297 700 lock_sock(sk);
797a22bd
ED		 701 if (sock_flag(sk, SOCK_ZAPPED)) {
702 x25_sk(sk)->source_addr = addr->sx25_addr;
703 x25_insert_socket(sk);
704 sock_reset_flag(sk, SOCK_ZAPPED);
705 } else {
706 rc = -EINVAL;
707 }
90c27297 708 release_sock(sk);
1da177e4 709 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
91774904 710out:
91774904 711 return rc;
1da177e4
LT		 712}
713
714static int x25_wait_for_connection_establishment(struct sock *sk)
715{
716 DECLARE_WAITQUEUE(wait, current);
f8e1d201 717 int rc;
1da177e4 718
aa395145 719 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 720 for (;;) {
721 __set_current_state(TASK_INTERRUPTIBLE);
722 rc = -ERESTARTSYS;
723 if (signal_pending(current))
724 break;
725 rc = sock_error(sk);
726 if (rc) {
727 sk->sk_socket->state = SS_UNCONNECTED;
728 break;
729 }
730 rc = 0;
731 if (sk->sk_state != TCP_ESTABLISHED) {
732 release_sock(sk);
733 schedule();
734 lock_sock(sk);
735 } else
736 break;
737 }
738 __set_current_state(TASK_RUNNING);
aa395145 739 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 740 return rc;
741}
742
743static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
744 int addr_len, int flags)
745{
746 struct sock *sk = sock->sk;
747 struct x25_sock *x25 = x25_sk(sk);
748 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
749 struct x25_route *rt;
750 int rc = 0;
751
752 lock_sock(sk);
753 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
754 sock->state = SS_CONNECTED;
755 goto out; /* Connect completed during a ERESTARTSYS event */
756 }
757
758 rc = -ECONNREFUSED;
759 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
760 sock->state = SS_UNCONNECTED;
761 goto out;
762 }
763
764 rc = -EISCONN; /* No reconnect on a seqpacket socket */
765 if (sk->sk_state == TCP_ESTABLISHED)
766 goto out;
767
f8e1d201 768 sk->sk_state = TCP_CLOSE;
1da177e4
LT		 769 sock->state = SS_UNCONNECTED;
770
771 rc = -EINVAL;
772 if (addr_len != sizeof(struct sockaddr_x25) ||
773 addr->sx25_family != AF_X25)
774 goto out;
775
776 rc = -ENETUNREACH;
777 rt = x25_get_route(&addr->sx25_addr);
778 if (!rt)
779 goto out;
780
781 x25->neighbour = x25_get_neigh(rt->dev);
782 if (!x25->neighbour)
783 goto out_put_route;
784
785 x25_limit_facilities(&x25->facilities, x25->neighbour);
786
787 x25->lci = x25_new_lci(x25->neighbour);
788 if (!x25->lci)
789 goto out_put_neigh;
790
791 rc = -EINVAL;
792 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
793 goto out_put_neigh;
794
795 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
796 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
797
798 x25->dest_addr = addr->sx25_addr;
799
800 /* Move to connecting socket, start sending Connect Requests */
801 sock->state = SS_CONNECTING;
802 sk->sk_state = TCP_SYN_SENT;
803
804 x25->state = X25_STATE_1;
805
806 x25_write_internal(sk, X25_CALL_REQUEST);
807
808 x25_start_heartbeat(sk);
809 x25_start_t21timer(sk);
810
811 /* Now the loop */
812 rc = -EINPROGRESS;
813 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
814 goto out_put_neigh;
815
816 rc = x25_wait_for_connection_establishment(sk);
817 if (rc)
818 goto out_put_neigh;
819
820 sock->state = SS_CONNECTED;
821 rc = 0;
822out_put_neigh:
95d6ebd5
ED		 823 if (rc) {
824 read_lock_bh(&x25_list_lock);
1da177e4 825 x25_neigh_put(x25->neighbour);
95d6ebd5
ED		 826 x25->neighbour = NULL;
827 read_unlock_bh(&x25_list_lock);
ee74d0bd 828 x25->state = X25_STATE_0;
95d6ebd5 829 }
1da177e4
LT		 830out_put_route:
831 x25_route_put(rt);
832out:
833 release_sock(sk);
834 return rc;
835}
836
bac37ec8 837static int x25_wait_for_data(struct sock *sk, long timeout)
1da177e4
LT		 838{
839 DECLARE_WAITQUEUE(wait, current);
840 int rc = 0;
841
aa395145 842 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 843 for (;;) {
844 __set_current_state(TASK_INTERRUPTIBLE);
845 if (sk->sk_shutdown & RCV_SHUTDOWN)
846 break;
847 rc = -ERESTARTSYS;
848 if (signal_pending(current))
849 break;
850 rc = -EAGAIN;
851 if (!timeout)
852 break;
853 rc = 0;
854 if (skb_queue_empty(&sk->sk_receive_queue)) {
855 release_sock(sk);
856 timeout = schedule_timeout(timeout);
857 lock_sock(sk);
858 } else
859 break;
860 }
861 __set_current_state(TASK_RUNNING);
aa395145 862 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 863 return rc;
864}
f8e1d201 865
cdfbabfb
DH		 866static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
867 bool kern)
1da177e4
LT		 868{
869 struct sock *sk = sock->sk;
870 struct sock *newsk;
871 struct sk_buff *skb;
872 int rc = -EINVAL;
873
141646ce 874 if (!sk)
1da177e4
LT		 875 goto out;
876
877 rc = -EOPNOTSUPP;
878 if (sk->sk_type != SOCK_SEQPACKET)
879 goto out;
880
881 lock_sock(sk);
141646ce
AH		 882 rc = -EINVAL;
883 if (sk->sk_state != TCP_LISTEN)
884 goto out2;
885
1da177e4
LT		 886 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
887 if (rc)
888 goto out2;
889 skb = skb_dequeue(&sk->sk_receive_queue);
890 rc = -EINVAL;
891 if (!skb->sk)
892 goto out2;
893 newsk = skb->sk;
b61d38e0 894 sock_graft(newsk, newsock);
1da177e4
LT		 895
896 /* Now attach up the new socket */
897 skb->sk = NULL;
898 kfree_skb(skb);
899 sk->sk_ack_backlog--;
1da177e4
LT		 900 newsock->state = SS_CONNECTED;
901 rc = 0;
902out2:
903 release_sock(sk);
904out:
905 return rc;
906}
907
908static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
9b2c45d4 909 int peer)
1da177e4
LT		 910{
911 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
912 struct sock *sk = sock->sk;
913 struct x25_sock *x25 = x25_sk(sk);
91774904 914 int rc = 0;
1da177e4
LT		 915
916 if (peer) {
91774904
AB		 917 if (sk->sk_state != TCP_ESTABLISHED) {
918 rc = -ENOTCONN;
919 goto out;
920 }
1da177e4
LT		 921 sx25->sx25_addr = x25->dest_addr;
922 } else
923 sx25->sx25_addr = x25->source_addr;
924
925 sx25->sx25_family = AF_X25;
9b2c45d4 926 rc = sizeof(*sx25);
1da177e4 927
91774904 928out:
91774904
AB		 929 return rc;
930}
931
1da177e4
LT		 932int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
933 unsigned int lci)
934{
935 struct sock *sk;
936 struct sock *make;
937 struct x25_sock *makex25;
938 struct x25_address source_addr, dest_addr;
939 struct x25_facilities facilities;
a64b7b93 940 struct x25_dte_facilities dte_facilities;
95a9dc43 941 int len, addr_len, rc;
1da177e4
LT		 942
943 /*
944 * Remove the LCI and frame type.
945 */
946 skb_pull(skb, X25_STD_MIN_LEN);
947
948 /*
949 * Extract the X.25 addresses and convert them to ASCII strings,
950 * and remove them.
f5eb917b
JH		 951 *
952 * Address block is mandatory in call request packets
1da177e4 953 */
f5eb917b
JH		 954 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
955 if (addr_len <= 0)
956 goto out_clear_request;
95a9dc43 957 skb_pull(skb, addr_len);
1da177e4
LT		 958
959 /*
960 * Get the length of the facilities, skip past them for the moment
961 * get the call user data because this is needed to determine
962 * the correct listener
f5eb917b
JH		 963 *
964 * Facilities length is mandatory in call request packets
1da177e4 965 */
cb101ed2 966 if (!pskb_may_pull(skb, 1))
f5eb917b 967 goto out_clear_request;
1da177e4 968 len = skb->data[0] + 1;
cb101ed2 969 if (!pskb_may_pull(skb, len))
f5eb917b 970 goto out_clear_request;
1da177e4
LT		 971 skb_pull(skb,len);
972
c7fd0d48
MD		 973 /*
974 * Ensure that the amount of call user data is valid.
975 */
976 if (skb->len > X25_MAX_CUD_LEN)
977 goto out_clear_request;
978
cb101ed2
MD		 979 /*
980 * Get all the call user data so it can be used in
981 * x25_find_listener and skb_copy_from_linear_data up ahead.
982 */
983 if (!pskb_may_pull(skb, skb->len))
984 goto out_clear_request;
985
1da177e4
LT		 986 /*
987 * Find a listener for the particular address/cud pair.
988 */
cb65d506
SP		 989 sk = x25_find_listener(&source_addr,skb);
990 skb_push(skb,len);
1da177e4 991
95a9dc43
AH		 992 if (sk != NULL && sk_acceptq_is_full(sk)) {
993 goto out_sock_put;
994 }
995
1da177e4 996 /*
95a9dc43
AH		 997 * We dont have any listeners for this incoming call.
998 * Try forwarding it.
1da177e4 999 */
95a9dc43
AH		 1000 if (sk == NULL) {
1001 skb_push(skb, addr_len + X25_STD_MIN_LEN);
39e21c0d
AH		 1002 if (sysctl_x25_forward &&
1003 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
95a9dc43
AH		 1004 {
1005 /* Call was forwarded, dont process it any more */
1006 kfree_skb(skb);
1007 rc = 1;
1008 goto out;
1009 } else {
1010 /* No listeners, can't forward, clear the call */
1011 goto out_clear_request;
1012 }
1013 }
1da177e4
LT		 1014
1015 /*
1016 * Try to reach a compromise on the requested facilities.
1017 */
a64b7b93
SP		 1018 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1019 if (len == -1)
1da177e4
LT		 1020 goto out_sock_put;
1021
1022 /*
1023 * current neighbour/link might impose additional limits
1024 * on certain facilties
1025 */
1026
1027 x25_limit_facilities(&facilities, nb);
1028
1029 /*
1030 * Try to create a new socket.
1031 */
1032 make = x25_make_new(sk);
1033 if (!make)
1034 goto out_sock_put;
1035
1036 /*
1037 * Remove the facilities
1038 */
1039 skb_pull(skb, len);
1040
1041 skb->sk = make;
1042 make->sk_state = TCP_ESTABLISHED;
1043
1044 makex25 = x25_sk(make);
1045 makex25->lci = lci;
1046 makex25->dest_addr = dest_addr;
1047 makex25->source_addr = source_addr;
1048 makex25->neighbour = nb;
1049 makex25->facilities = facilities;
a64b7b93 1050 makex25->dte_facilities= dte_facilities;
1da177e4 1051 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
cb65d506
SP		 1052 /* ensure no reverse facil on accept */
1053 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
a64b7b93
SP		 1054 /* ensure no calling address extension on accept */
1055 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
cb65d506 1056 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1da177e4 1057
37cda787 1058 /* Normally all calls are accepted immediately */
1059 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
ebc3f64b
SP		 1060 x25_write_internal(make, X25_CALL_ACCEPTED);
1061 makex25->state = X25_STATE_3;
1062 }
1da177e4 1063
cb65d506
SP		 1064 /*
1065 * Incoming Call User Data.
1066 */
8db09f26
RK		 1067 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1068 makex25->calluserdata.cudlength = skb->len;
cb65d506 1069
1da177e4
LT		 1070 sk->sk_ack_backlog++;
1071
1072 x25_insert_socket(make);
1073
1074 skb_queue_head(&sk->sk_receive_queue, skb);
1075
1076 x25_start_heartbeat(make);
1077
1078 if (!sock_flag(sk, SOCK_DEAD))
676d2369 1079 sk->sk_data_ready(sk);
1da177e4
LT		 1080 rc = 1;
1081 sock_put(sk);
1082out:
1083 return rc;
1084out_sock_put:
1085 sock_put(sk);
1086out_clear_request:
1087 rc = 0;
1088 x25_transmit_clear_request(nb, lci, 0x01);
1089 goto out;
1090}
1091
1b784140 1092static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1da177e4
LT		 1093{
1094 struct sock *sk = sock->sk;
1095 struct x25_sock *x25 = x25_sk(sk);
342dfc30 1096 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1da177e4
LT		 1097 struct sockaddr_x25 sx25;
1098 struct sk_buff *skb;
1099 unsigned char *asmptr;
1100 int noblock = msg->msg_flags & MSG_DONTWAIT;
1101 size_t size;
1102 int qbit = 0, rc = -EINVAL;
1103
77b22836 1104 lock_sock(sk);
1da177e4
LT		 1105 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1106 goto out;
1107
1108 /* we currently don't support segmented records at the user interface */
1109 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1110 goto out;
1111
1112 rc = -EADDRNOTAVAIL;
1113 if (sock_flag(sk, SOCK_ZAPPED))
1114 goto out;
1115
1116 rc = -EPIPE;
1117 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1118 send_sig(SIGPIPE, current, 0);
1119 goto out;
1120 }
1121
1122 rc = -ENETUNREACH;
1123 if (!x25->neighbour)
1124 goto out;
1125
1126 if (usx25) {
1127 rc = -EINVAL;
1128 if (msg->msg_namelen < sizeof(sx25))
1129 goto out;
1130 memcpy(&sx25, usx25, sizeof(sx25));
1131 rc = -EISCONN;
1132 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1133 goto out;
1134 rc = -EINVAL;
1135 if (sx25.sx25_family != AF_X25)
1136 goto out;
1137 } else {
1138 /*
1139 * FIXME 1003.1g - if the socket is like this because
1140 * it has become closed (not started closed) we ought
1141 * to SIGPIPE, EPIPE;
1142 */
1143 rc = -ENOTCONN;
1144 if (sk->sk_state != TCP_ESTABLISHED)
1145 goto out;
1146
1147 sx25.sx25_family = AF_X25;
1148 sx25.sx25_addr = x25->dest_addr;
1149 }
1150
83e0bbcb
AC		 1151 /* Sanity check the packet size */
1152 if (len > 65535) {
1153 rc = -EMSGSIZE;
1154 goto out;
1155 }
1156
1da177e4
LT		 1157 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1158
1159 /* Build a packet */
1160 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1161
1162 if ((msg->msg_flags & MSG_OOB) && len > 32)
1163 len = 32;
1164
1165 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1166
77b22836 1167 release_sock(sk);
1da177e4 1168 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
77b22836 1169 lock_sock(sk);
1da177e4
LT		 1170 if (!skb)
1171 goto out;
1172 X25_SKB_CB(skb)->flags = msg->msg_flags;
1173
1174 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1175
1176 /*
1177 * Put the data on the end
1178 */
1179 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1180
eeeb0374
ACM		 1181 skb_reset_transport_header(skb);
1182 skb_put(skb, len);
1da177e4 1183
6ce8e9ce 1184 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1da177e4
LT		 1185 if (rc)
1186 goto out_kfree_skb;
1187
1188 /*
1189 * If the Q BIT Include socket option is in force, the first
1190 * byte of the user data is the logical value of the Q Bit.
1191 */
cb863ffd 1192 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
cb101ed2
MD		 1193 if (!pskb_may_pull(skb, 1))
1194 goto out_kfree_skb;
1195
1da177e4
LT		 1196 qbit = skb->data[0];
1197 skb_pull(skb, 1);
1198 }
1199
1200 /*
1201 * Push down the X.25 header
1202 */
1203 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1204
1205 if (msg->msg_flags & MSG_OOB) {
1206 if (x25->neighbour->extended) {
1207 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1208 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1209 *asmptr++ = (x25->lci >> 0) & 0xFF;
1210 *asmptr++ = X25_INTERRUPT;
1211 } else {
1212 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1213 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1214 *asmptr++ = (x25->lci >> 0) & 0xFF;
1215 *asmptr++ = X25_INTERRUPT;
1216 }
1217 } else {
1218 if (x25->neighbour->extended) {
1219 /* Build an Extended X.25 header */
1220 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1221 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1222 *asmptr++ = (x25->lci >> 0) & 0xFF;
1223 *asmptr++ = X25_DATA;
1224 *asmptr++ = X25_DATA;
1225 } else {
1226 /* Build an Standard X.25 header */
1227 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1228 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1229 *asmptr++ = (x25->lci >> 0) & 0xFF;
1230 *asmptr++ = X25_DATA;
1231 }
1232
1233 if (qbit)
1234 skb->data[0] |= X25_Q_BIT;
1235 }
1236
1237 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1238 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1239
1240 rc = -ENOTCONN;
1241 if (sk->sk_state != TCP_ESTABLISHED)
1242 goto out_kfree_skb;
1243
1244 if (msg->msg_flags & MSG_OOB)
1245 skb_queue_tail(&x25->interrupt_out_queue, skb);
1246 else {
8db09f26
RK		 1247 rc = x25_output(sk, skb);
1248 len = rc;
1249 if (rc < 0)
1da177e4 1250 kfree_skb(skb);
cb863ffd 1251 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1da177e4
LT		 1252 len++;
1253 }
1254
1da177e4 1255 x25_kick(sk);
1da177e4
LT		 1256 rc = len;
1257out:
77b22836 1258 release_sock(sk);
1da177e4
LT		 1259 return rc;
1260out_kfree_skb:
1261 kfree_skb(skb);
1262 goto out;
1263}
1264
1265
1b784140 1266static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1da177e4
LT		 1267 int flags)
1268{
1269 struct sock *sk = sock->sk;
1270 struct x25_sock *x25 = x25_sk(sk);
342dfc30 1271 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1da177e4 1272 size_t copied;
501e89d3 1273 int qbit, header_len;
1da177e4
LT		 1274 struct sk_buff *skb;
1275 unsigned char *asmptr;
1276 int rc = -ENOTCONN;
1277
77b22836 1278 lock_sock(sk);
501e89d3
DJ		 1279
1280 if (x25->neighbour == NULL)
1281 goto out;
1282
1283 header_len = x25->neighbour->extended ?
1284 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1285
1da177e4
LT		 1286 /*
1287 * This works for seqpacket too. The receiver has ordered the queue for
1288 * us! We do one quick check first though
1289 */
1290 if (sk->sk_state != TCP_ESTABLISHED)
1291 goto out;
1292
1293 if (flags & MSG_OOB) {
1294 rc = -EINVAL;
1295 if (sock_flag(sk, SOCK_URGINLINE) ||
1296 !skb_peek(&x25->interrupt_in_queue))
1297 goto out;
1298
1299 skb = skb_dequeue(&x25->interrupt_in_queue);
1300
cb101ed2
MD		 1301 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1302 goto out_free_dgram;
1303
1da177e4
LT		 1304 skb_pull(skb, X25_STD_MIN_LEN);
1305
1306 /*
1307 * No Q bit information on Interrupt data.
1308 */
cb863ffd 1309 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1310 asmptr = skb_push(skb, 1);
1311 *asmptr = 0x00;
1312 }
1313
1314 msg->msg_flags |= MSG_OOB;
1315 } else {
1316 /* Now we can treat all alike */
77b22836 1317 release_sock(sk);
1da177e4
LT		 1318 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1319 flags & MSG_DONTWAIT, &rc);
77b22836 1320 lock_sock(sk);
1da177e4
LT		 1321 if (!skb)
1322 goto out;
1323
cb101ed2
MD		 1324 if (!pskb_may_pull(skb, header_len))
1325 goto out_free_dgram;
1326
1da177e4
LT		 1327 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1328
cb101ed2 1329 skb_pull(skb, header_len);
1da177e4 1330
cb863ffd 1331 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1332 asmptr = skb_push(skb, 1);
1333 *asmptr = qbit;
1334 }
1335 }
1336
badff6d0 1337 skb_reset_transport_header(skb);
1da177e4
LT		 1338 copied = skb->len;
1339
1340 if (copied > size) {
1341 copied = size;
1342 msg->msg_flags |= MSG_TRUNC;
1343 }
1344
f8e1d201 1345 /* Currently, each datagram always contains a complete record */
1da177e4
LT		 1346 msg->msg_flags |= MSG_EOR;
1347
51f3d02b 1348 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1da177e4
LT		 1349 if (rc)
1350 goto out_free_dgram;
1351
1352 if (sx25) {
1353 sx25->sx25_family = AF_X25;
1354 sx25->sx25_addr = x25->dest_addr;
f3d33426 1355 msg->msg_namelen = sizeof(*sx25);
1da177e4
LT		 1356 }
1357
1da177e4 1358 x25_check_rbuf(sk);
1da177e4
LT		 1359 rc = copied;
1360out_free_dgram:
1361 skb_free_datagram(sk, skb);
1362out:
77b22836 1363 release_sock(sk);
1da177e4
LT		 1364 return rc;
1365}
1366
1367
1368static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1369{
1370 struct sock *sk = sock->sk;
1371 struct x25_sock *x25 = x25_sk(sk);
1372 void __user *argp = (void __user *)arg;
1373 int rc;
1374
1375 switch (cmd) {
fddc5f3e
JP		 1376 case TIOCOUTQ: {
1377 int amount;
1378
1379 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1380 if (amount < 0)
1381 amount = 0;
1382 rc = put_user(amount, (unsigned int __user *)argp);
1383 break;
1384 }
1da177e4 1385
fddc5f3e
JP		 1386 case TIOCINQ: {
1387 struct sk_buff *skb;
1388 int amount = 0;
1389 /*
1390 * These two are safe on a single CPU system as
1391 * only user tasks fiddle here
1392 */
1393 lock_sock(sk);
1394 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1395 amount = skb->len;
1396 release_sock(sk);
1397 rc = put_user(amount, (unsigned int __user *)argp);
1398 break;
1399 }
1da177e4 1400
fddc5f3e
JP		 1401 case SIOCGSTAMP:
1402 rc = -EINVAL;
1403 if (sk)
1404 rc = sock_get_timestamp(sk,
f8e1d201 1405 (struct timeval __user *)argp);
fddc5f3e
JP		 1406 break;
1407 case SIOCGSTAMPNS:
1408 rc = -EINVAL;
1409 if (sk)
1410 rc = sock_get_timestampns(sk,
1411 (struct timespec __user *)argp);
1412 break;
1413 case SIOCGIFADDR:
1414 case SIOCSIFADDR:
1415 case SIOCGIFDSTADDR:
1416 case SIOCSIFDSTADDR:
1417 case SIOCGIFBRDADDR:
1418 case SIOCSIFBRDADDR:
1419 case SIOCGIFNETMASK:
1420 case SIOCSIFNETMASK:
1421 case SIOCGIFMETRIC:
1422 case SIOCSIFMETRIC:
1423 rc = -EINVAL;
1424 break;
1425 case SIOCADDRT:
1426 case SIOCDELRT:
1427 rc = -EPERM;
1428 if (!capable(CAP_NET_ADMIN))
1da177e4 1429 break;
fddc5f3e
JP		 1430 rc = x25_route_ioctl(cmd, argp);
1431 break;
1432 case SIOCX25GSUBSCRIP:
1433 rc = x25_subscr_ioctl(cmd, argp);
1434 break;
1435 case SIOCX25SSUBSCRIP:
1436 rc = -EPERM;
1437 if (!capable(CAP_NET_ADMIN))
1da177e4 1438 break;
fddc5f3e
JP		 1439 rc = x25_subscr_ioctl(cmd, argp);
1440 break;
1441 case SIOCX25GFACILITIES: {
1442 lock_sock(sk);
1443 rc = copy_to_user(argp, &x25->facilities,
1444 sizeof(x25->facilities))
1445 ? -EFAULT : 0;
1446 release_sock(sk);
1447 break;
1448 }
1da177e4 1449
fddc5f3e
JP		 1450 case SIOCX25SFACILITIES: {
1451 struct x25_facilities facilities;
1452 rc = -EFAULT;
1453 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1454 break;
1455 rc = -EINVAL;
1456 lock_sock(sk);
1457 if (sk->sk_state != TCP_LISTEN &&
1458 sk->sk_state != TCP_CLOSE)
1459 goto out_fac_release;
1460 if (facilities.pacsize_in < X25_PS16 ||
1461 facilities.pacsize_in > X25_PS4096)
1462 goto out_fac_release;
1463 if (facilities.pacsize_out < X25_PS16 ||
1464 facilities.pacsize_out > X25_PS4096)
1465 goto out_fac_release;
1466 if (facilities.winsize_in < 1 ||
1467 facilities.winsize_in > 127)
1468 goto out_fac_release;
1469 if (facilities.throughput) {
1470 int out = facilities.throughput & 0xf0;
1471 int in = facilities.throughput & 0x0f;
1472 if (!out)
1473 facilities.throughput |=
1474 X25_DEFAULT_THROUGHPUT << 4;
1475 else if (out < 0x30 || out > 0xD0)
f90de660 1476 goto out_fac_release;
fddc5f3e
JP		 1477 if (!in)
1478 facilities.throughput |=
1479 X25_DEFAULT_THROUGHPUT;
1480 else if (in < 0x03 || in > 0x0D)
f90de660 1481 goto out_fac_release;
f8e1d201 1482 }
fddc5f3e
JP		 1483 if (facilities.reverse &&
1484 (facilities.reverse & 0x81) != 0x81)
1485 goto out_fac_release;
1486 x25->facilities = facilities;
1487 rc = 0;
1488out_fac_release:
1489 release_sock(sk);
1490 break;
1491 }
a64b7b93 1492
fddc5f3e
JP		 1493 case SIOCX25GDTEFACILITIES: {
1494 lock_sock(sk);
1495 rc = copy_to_user(argp, &x25->dte_facilities,
1496 sizeof(x25->dte_facilities));
1497 release_sock(sk);
1498 if (rc)
f8e1d201 1499 rc = -EFAULT;
fddc5f3e
JP		 1500 break;
1501 }
a64b7b93 1502
fddc5f3e
JP		 1503 case SIOCX25SDTEFACILITIES: {
1504 struct x25_dte_facilities dtefacs;
1505 rc = -EFAULT;
1506 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1da177e4 1507 break;
fddc5f3e
JP		 1508 rc = -EINVAL;
1509 lock_sock(sk);
1510 if (sk->sk_state != TCP_LISTEN &&
1511 sk->sk_state != TCP_CLOSE)
1512 goto out_dtefac_release;
1513 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1514 goto out_dtefac_release;
fddc5f3e 1515 if (dtefacs.called_len > X25_MAX_AE_LEN)
fddc5f3e
JP		 1516 goto out_dtefac_release;
1517 x25->dte_facilities = dtefacs;
1518 rc = 0;
1519out_dtefac_release:
1520 release_sock(sk);
1521 break;
1522 }
1da177e4 1523
fddc5f3e
JP		 1524 case SIOCX25GCALLUSERDATA: {
1525 lock_sock(sk);
1526 rc = copy_to_user(argp, &x25->calluserdata,
1527 sizeof(x25->calluserdata))
1528 ? -EFAULT : 0;
1529 release_sock(sk);
1530 break;
1531 }
1da177e4 1532
fddc5f3e
JP		 1533 case SIOCX25SCALLUSERDATA: {
1534 struct x25_calluserdata calluserdata;
1da177e4 1535
fddc5f3e
JP		 1536 rc = -EFAULT;
1537 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1da177e4 1538 break;
fddc5f3e
JP		 1539 rc = -EINVAL;
1540 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1541 break;
1542 lock_sock(sk);
1543 x25->calluserdata = calluserdata;
1544 release_sock(sk);
1545 rc = 0;
1546 break;
1547 }
1da177e4 1548
fddc5f3e
JP		 1549 case SIOCX25GCAUSEDIAG: {
1550 lock_sock(sk);
1551 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1552 ? -EFAULT : 0;
1553 release_sock(sk);
1554 break;
1555 }
1556
1557 case SIOCX25SCAUSEDIAG: {
1558 struct x25_causediag causediag;
1559 rc = -EFAULT;
1560 if (copy_from_user(&causediag, argp, sizeof(causediag)))
386e50cc 1561 break;
fddc5f3e
JP		 1562 lock_sock(sk);
1563 x25->causediag = causediag;
1564 release_sock(sk);
1565 rc = 0;
1566 break;
386e50cc 1567
fddc5f3e 1568 }
386e50cc 1569
fddc5f3e
JP		 1570 case SIOCX25SCUDMATCHLEN: {
1571 struct x25_subaddr sub_addr;
1572 rc = -EINVAL;
1573 lock_sock(sk);
1574 if(sk->sk_state != TCP_CLOSE)
1575 goto out_cud_release;
1576 rc = -EFAULT;
1577 if (copy_from_user(&sub_addr, argp,
1578 sizeof(sub_addr)))
1579 goto out_cud_release;
1580 rc = -EINVAL;
1581 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1582 goto out_cud_release;
1583 x25->cudmatchlength = sub_addr.cudmatchlength;
1584 rc = 0;
3f0a069a 1585out_cud_release:
fddc5f3e
JP		 1586 release_sock(sk);
1587 break;
1588 }
cb65d506 1589
fddc5f3e
JP		 1590 case SIOCX25CALLACCPTAPPRV: {
1591 rc = -EINVAL;
1592 lock_sock(sk);
4ccb93ce
DJ		 1593 if (sk->sk_state == TCP_CLOSE) {
1594 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1595 rc = 0;
1596 }
fddc5f3e 1597 release_sock(sk);
fddc5f3e
JP		 1598 break;
1599 }
ebc3f64b 1600
fddc5f3e
JP		 1601 case SIOCX25SENDCALLACCPT: {
1602 rc = -EINVAL;
1603 lock_sock(sk);
1604 if (sk->sk_state != TCP_ESTABLISHED)
4ccb93ce 1605 goto out_sendcallaccpt_release;
fddc5f3e
JP		 1606 /* must call accptapprv above */
1607 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
4ccb93ce 1608 goto out_sendcallaccpt_release;
fddc5f3e
JP		 1609 x25_write_internal(sk, X25_CALL_ACCEPTED);
1610 x25->state = X25_STATE_3;
fddc5f3e 1611 rc = 0;
4ccb93ce
DJ		 1612out_sendcallaccpt_release:
1613 release_sock(sk);
fddc5f3e
JP		 1614 break;
1615 }
1616
1617 default:
1618 rc = -ENOIOCTLCMD;
1619 break;
1da177e4
LT		 1620 }
1621
1622 return rc;
1623}
1624
ec1b4cf7 1625static const struct net_proto_family x25_family_ops = {
1da177e4
LT		 1626 .family = AF_X25,
1627 .create = x25_create,
1628 .owner = THIS_MODULE,
1629};
1630
1b06e6ba
SP		 1631#ifdef CONFIG_COMPAT
1632static int compat_x25_subscr_ioctl(unsigned int cmd,
1633 struct compat_x25_subscrip_struct __user *x25_subscr32)
1634{
1635 struct compat_x25_subscrip_struct x25_subscr;
1636 struct x25_neigh *nb;
1637 struct net_device *dev;
1638 int rc = -EINVAL;
1639
1640 rc = -EFAULT;
1641 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1642 goto out;
1643
1644 rc = -EINVAL;
1645 dev = x25_dev_get(x25_subscr.device);
1646 if (dev == NULL)
1647 goto out;
1648
1649 nb = x25_get_neigh(dev);
1650 if (nb == NULL)
1651 goto out_dev_put;
1652
1653 dev_put(dev);
1654
1655 if (cmd == SIOCX25GSUBSCRIP) {
5595a1a5 1656 read_lock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1657 x25_subscr.extended = nb->extended;
1658 x25_subscr.global_facil_mask = nb->global_facil_mask;
5595a1a5 1659 read_unlock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1660 rc = copy_to_user(x25_subscr32, &x25_subscr,
1661 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1662 } else {
1663 rc = -EINVAL;
1664 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1665 rc = 0;
5595a1a5 1666 write_lock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1667 nb->extended = x25_subscr.extended;
1668 nb->global_facil_mask = x25_subscr.global_facil_mask;
5595a1a5 1669 write_unlock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1670 }
1671 }
1672 x25_neigh_put(nb);
1673out:
1674 return rc;
1675out_dev_put:
1676 dev_put(dev);
1677 goto out;
1678}
1679
1680static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1681 unsigned long arg)
1682{
1683 void __user *argp = compat_ptr(arg);
1684 struct sock *sk = sock->sk;
1685
1686 int rc = -ENOIOCTLCMD;
1687
1688 switch(cmd) {
1689 case TIOCOUTQ:
1690 case TIOCINQ:
1691 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1692 break;
1693 case SIOCGSTAMP:
1694 rc = -EINVAL;
1695 if (sk)
1696 rc = compat_sock_get_timestamp(sk,
1697 (struct timeval __user*)argp);
1698 break;
ae40eb1e
ED		 1699 case SIOCGSTAMPNS:
1700 rc = -EINVAL;
1701 if (sk)
1702 rc = compat_sock_get_timestampns(sk,
1703 (struct timespec __user*)argp);
1704 break;
1b06e6ba
SP		 1705 case SIOCGIFADDR:
1706 case SIOCSIFADDR:
1707 case SIOCGIFDSTADDR:
1708 case SIOCSIFDSTADDR:
1709 case SIOCGIFBRDADDR:
1710 case SIOCSIFBRDADDR:
1711 case SIOCGIFNETMASK:
1712 case SIOCSIFNETMASK:
1713 case SIOCGIFMETRIC:
1714 case SIOCSIFMETRIC:
1715 rc = -EINVAL;
1716 break;
1717 case SIOCADDRT:
1718 case SIOCDELRT:
1719 rc = -EPERM;
1720 if (!capable(CAP_NET_ADMIN))
1721 break;
1722 rc = x25_route_ioctl(cmd, argp);
1723 break;
1724 case SIOCX25GSUBSCRIP:
1725 rc = compat_x25_subscr_ioctl(cmd, argp);
1726 break;
1727 case SIOCX25SSUBSCRIP:
1728 rc = -EPERM;
1729 if (!capable(CAP_NET_ADMIN))
1730 break;
1731 rc = compat_x25_subscr_ioctl(cmd, argp);
1732 break;
1733 case SIOCX25GFACILITIES:
1734 case SIOCX25SFACILITIES:
9a6b9f2e
SP		 1735 case SIOCX25GDTEFACILITIES:
1736 case SIOCX25SDTEFACILITIES:
1b06e6ba
SP		 1737 case SIOCX25GCALLUSERDATA:
1738 case SIOCX25SCALLUSERDATA:
1739 case SIOCX25GCAUSEDIAG:
386e50cc 1740 case SIOCX25SCAUSEDIAG:
1b06e6ba
SP		 1741 case SIOCX25SCUDMATCHLEN:
1742 case SIOCX25CALLACCPTAPPRV:
1743 case SIOCX25SENDCALLACCPT:
1744 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1745 break;
1746 default:
1747 rc = -ENOIOCTLCMD;
1748 break;
1749 }
1750 return rc;
1751}
1752#endif
1753
91774904 1754static const struct proto_ops x25_proto_ops = {
1da177e4
LT		 1755 .family = AF_X25,
1756 .owner = THIS_MODULE,
1757 .release = x25_release,
1758 .bind = x25_bind,
1759 .connect = x25_connect,
1760 .socketpair = sock_no_socketpair,
1761 .accept = x25_accept,
1762 .getname = x25_getname,
a11e1d43 1763 .poll = datagram_poll,
1da177e4 1764 .ioctl = x25_ioctl,
1b06e6ba
SP		 1765#ifdef CONFIG_COMPAT
1766 .compat_ioctl = compat_x25_ioctl,
1767#endif
1da177e4
LT		 1768 .listen = x25_listen,
1769 .shutdown = sock_no_shutdown,
1770 .setsockopt = x25_setsockopt,
1771 .getsockopt = x25_getsockopt,
1772 .sendmsg = x25_sendmsg,
1773 .recvmsg = x25_recvmsg,
1774 .mmap = sock_no_mmap,
1775 .sendpage = sock_no_sendpage,
1776};
1777
7546dd97 1778static struct packet_type x25_packet_type __read_mostly = {
09640e63 1779 .type = cpu_to_be16(ETH_P_X25),
1da177e4
LT		 1780 .func = x25_lapb_receive_frame,
1781};
1782
1783static struct notifier_block x25_dev_notifier = {
1784 .notifier_call = x25_device_event,
1785};
1786
1787void x25_kill_by_neigh(struct x25_neigh *nb)
1788{
1789 struct sock *s;
1da177e4
LT		 1790
1791 write_lock_bh(&x25_list_lock);
1792
b67bfe0d 1793 sk_for_each(s, &x25_list)
1da177e4
LT		 1794 if (x25_sk(s)->neighbour == nb)
1795 x25_disconnect(s, ENETUNREACH, 0, 0);
1796
1797 write_unlock_bh(&x25_list_lock);
95a9dc43
AH		 1798
1799 /* Remove any related forwards */
1800 x25_clear_forward_by_dev(nb->dev);
1da177e4
LT		 1801}
1802
1803static int __init x25_init(void)
1804{
64df6d52 1805 int rc;
1da177e4 1806
64df6d52 1807 rc = proto_register(&x25_proto, 0);
1808 if (rc)
1da177e4
LT		 1809 goto out;
1810
1fd975a0 1811 rc = sock_register(&x25_family_ops);
64df6d52 1812 if (rc)
1fd975a0 1813 goto out_proto;
1da177e4
LT		 1814
1815 dev_add_pack(&x25_packet_type);
1816
1fd975a0 1817 rc = register_netdevice_notifier(&x25_dev_notifier);
64df6d52 1818 if (rc)
1fd975a0 1819 goto out_sock;
1da177e4 1820
64df6d52 1821 rc = x25_register_sysctl();
1822 if (rc)
1823 goto out_dev;
1da177e4 1824
1fd975a0 1825 rc = x25_proc_init();
64df6d52 1826 if (rc)
1827 goto out_sysctl;
1828
1829 pr_info("Linux Version 0.2\n");
1830
1da177e4
LT		 1831out:
1832 return rc;
64df6d52 1833out_sysctl:
1834 x25_unregister_sysctl();
1fd975a0 1835out_dev:
1836 unregister_netdevice_notifier(&x25_dev_notifier);
1837out_sock:
64df6d52 1838 dev_remove_pack(&x25_packet_type);
1fd975a0 1839 sock_unregister(AF_X25);
1840out_proto:
1841 proto_unregister(&x25_proto);
1842 goto out;
1da177e4
LT		 1843}
1844module_init(x25_init);
1845
1846static void __exit x25_exit(void)
1847{
1848 x25_proc_exit();
1849 x25_link_free();
1850 x25_route_free();
1851
1da177e4 1852 x25_unregister_sysctl();
1da177e4
LT		 1853
1854 unregister_netdevice_notifier(&x25_dev_notifier);
1855
1856 dev_remove_pack(&x25_packet_type);
1857
1858 sock_unregister(AF_X25);
1859 proto_unregister(&x25_proto);
1860}
1861module_exit(x25_exit);
1862
1863MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1864MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1865MODULE_LICENSE("GPL");
1866MODULE_ALIAS_NETPROTO(PF_X25);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git