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[mirror_ubuntu-bionic-kernel.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;
103 needed = 1 + (len >> 4) + (len & 0x0f);
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
SP		 290 x25_sk(s)->source_addr.x25_addr) ||
291 !strcmp(addr->x25_addr,
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
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 */
14ebaf81 372static void __x25_destroy_socket(struct sock *);
1da177e4
LT		 373
374/*
375 * handler for deferred kills.
376 */
99767f27 377static void x25_destroy_timer(struct timer_list *t)
1da177e4 378{
99767f27
KC		 379 struct sock *sk = from_timer(sk, t, sk_timer);
380
381 x25_destroy_socket_from_timer(sk);
1da177e4
LT		 382}
383
384/*
385 * This is called from user mode and the timers. Thus it protects itself
386 * against interrupt users but doesn't worry about being called during
387 * work. Once it is removed from the queue no interrupt or bottom half
388 * will touch it and we are (fairly 8-) ) safe.
389 * Not static as it's used by the timer
390 */
14ebaf81 391static void __x25_destroy_socket(struct sock *sk)
1da177e4
LT		 392{
393 struct sk_buff *skb;
394
1da177e4
LT		 395 x25_stop_heartbeat(sk);
396 x25_stop_timer(sk);
397
398 x25_remove_socket(sk);
399 x25_clear_queues(sk); /* Flush the queues */
400
401 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
402 if (skb->sk != sk) { /* A pending connection */
403 /*
404 * Queue the unaccepted socket for death
405 */
2cec6b01 406 skb->sk->sk_state = TCP_LISTEN;
1da177e4
LT		 407 sock_set_flag(skb->sk, SOCK_DEAD);
408 x25_start_heartbeat(skb->sk);
409 x25_sk(skb->sk)->state = X25_STATE_0;
410 }
411
412 kfree_skb(skb);
413 }
414
c564039f 415 if (sk_has_allocations(sk)) {
1da177e4
LT		 416 /* Defer: outstanding buffers */
417 sk->sk_timer.expires = jiffies + 10 * HZ;
841b86f3 418 sk->sk_timer.function = x25_destroy_timer;
1da177e4
LT		 419 add_timer(&sk->sk_timer);
420 } else {
421 /* drop last reference so sock_put will free */
422 __sock_put(sk);
423 }
14ebaf81 424}
1da177e4 425
14ebaf81
DM		 426void x25_destroy_socket_from_timer(struct sock *sk)
427{
428 sock_hold(sk);
429 bh_lock_sock(sk);
430 __x25_destroy_socket(sk);
431 bh_unlock_sock(sk);
432 sock_put(sk);
433}
434
1da177e4
LT		 435/*
436 * Handling for system calls applied via the various interfaces to a
437 * X.25 socket object.
438 */
439
440static int x25_setsockopt(struct socket *sock, int level, int optname,
b7058842 441 char __user *optval, unsigned int optlen)
1da177e4
LT		 442{
443 int opt;
444 struct sock *sk = sock->sk;
445 int rc = -ENOPROTOOPT;
446
447 if (level != SOL_X25 || optname != X25_QBITINCL)
448 goto out;
449
450 rc = -EINVAL;
451 if (optlen < sizeof(int))
452 goto out;
453
454 rc = -EFAULT;
455 if (get_user(opt, (int __user *)optval))
456 goto out;
457
cb863ffd 458 if (opt)
459 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
460 else
461 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 462 rc = 0;
463out:
464 return rc;
465}
466
467static int x25_getsockopt(struct socket *sock, int level, int optname,
468 char __user *optval, int __user *optlen)
469{
470 struct sock *sk = sock->sk;
471 int val, len, rc = -ENOPROTOOPT;
f8e1d201 472
1da177e4
LT		 473 if (level != SOL_X25 || optname != X25_QBITINCL)
474 goto out;
475
476 rc = -EFAULT;
477 if (get_user(len, optlen))
478 goto out;
479
480 len = min_t(unsigned int, len, sizeof(int));
481
482 rc = -EINVAL;
483 if (len < 0)
484 goto out;
f8e1d201 485
1da177e4
LT		 486 rc = -EFAULT;
487 if (put_user(len, optlen))
488 goto out;
489
cb863ffd 490 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 491 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
492out:
493 return rc;
494}
495
496static int x25_listen(struct socket *sock, int backlog)
497{
498 struct sock *sk = sock->sk;
499 int rc = -EOPNOTSUPP;
500
25aa4efe 501 lock_sock(sk);
1da177e4
LT		 502 if (sk->sk_state != TCP_LISTEN) {
503 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
504 sk->sk_max_ack_backlog = backlog;
505 sk->sk_state = TCP_LISTEN;
506 rc = 0;
507 }
25aa4efe 508 release_sock(sk);
1da177e4
LT		 509
510 return rc;
511}
512
513static struct proto x25_proto = {
514 .name = "X25",
515 .owner = THIS_MODULE,
516 .obj_size = sizeof(struct x25_sock),
517};
518
11aa9c28 519static struct sock *x25_alloc_socket(struct net *net, int kern)
1da177e4
LT		 520{
521 struct x25_sock *x25;
11aa9c28 522 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
1da177e4
LT		 523
524 if (!sk)
525 goto out;
526
527 sock_init_data(NULL, sk);
528
529 x25 = x25_sk(sk);
530 skb_queue_head_init(&x25->ack_queue);
531 skb_queue_head_init(&x25->fragment_queue);
532 skb_queue_head_init(&x25->interrupt_in_queue);
533 skb_queue_head_init(&x25->interrupt_out_queue);
534out:
535 return sk;
536}
537
3f378b68
EP		 538static int x25_create(struct net *net, struct socket *sock, int protocol,
539 int kern)
1da177e4
LT		 540{
541 struct sock *sk;
542 struct x25_sock *x25;
b18e7a06 543 int rc = -EAFNOSUPPORT;
1da177e4 544
09ad9bc7 545 if (!net_eq(net, &init_net))
b18e7a06 546 goto out;
547
548 rc = -ESOCKTNOSUPPORT;
549 if (sock->type != SOCK_SEQPACKET)
550 goto out;
1b8d7ae4 551
b18e7a06 552 rc = -EINVAL;
553 if (protocol)
1da177e4
LT		 554 goto out;
555
b18e7a06 556 rc = -ENOBUFS;
11aa9c28 557 if ((sk = x25_alloc_socket(net, kern)) == NULL)
1da177e4
LT		 558 goto out;
559
560 x25 = x25_sk(sk);
561
562 sock_init_data(sock, sk);
563
564 x25_init_timers(sk);
565
566 sock->ops = &x25_proto_ops;
567 sk->sk_protocol = protocol;
568 sk->sk_backlog_rcv = x25_backlog_rcv;
569
570 x25->t21 = sysctl_x25_call_request_timeout;
571 x25->t22 = sysctl_x25_reset_request_timeout;
572 x25->t23 = sysctl_x25_clear_request_timeout;
573 x25->t2 = sysctl_x25_ack_holdback_timeout;
574 x25->state = X25_STATE_0;
cb65d506 575 x25->cudmatchlength = 0;
37cda787 576 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
ebc3f64b 577 /* on call accept */
1da177e4
LT		 578
579 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
580 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
581 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
582 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
ddd0451f
JH		 583 x25->facilities.throughput = 0; /* by default don't negotiate
584 throughput */
1da177e4 585 x25->facilities.reverse = X25_DEFAULT_REVERSE;
f8e1d201
YH		 586 x25->dte_facilities.calling_len = 0;
587 x25->dte_facilities.called_len = 0;
588 memset(x25->dte_facilities.called_ae, '\0',
589 sizeof(x25->dte_facilities.called_ae));
590 memset(x25->dte_facilities.calling_ae, '\0',
591 sizeof(x25->dte_facilities.calling_ae));
a64b7b93 592
1da177e4
LT		 593 rc = 0;
594out:
595 return rc;
596}
597
598static struct sock *x25_make_new(struct sock *osk)
599{
600 struct sock *sk = NULL;
601 struct x25_sock *x25, *ox25;
602
603 if (osk->sk_type != SOCK_SEQPACKET)
604 goto out;
605
11aa9c28 606 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
1da177e4
LT		 607 goto out;
608
609 x25 = x25_sk(sk);
610
611 sk->sk_type = osk->sk_type;
1da177e4
LT		 612 sk->sk_priority = osk->sk_priority;
613 sk->sk_protocol = osk->sk_protocol;
614 sk->sk_rcvbuf = osk->sk_rcvbuf;
615 sk->sk_sndbuf = osk->sk_sndbuf;
616 sk->sk_state = TCP_ESTABLISHED;
1da177e4 617 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
a20a8554 618 sock_copy_flags(sk, osk);
1da177e4
LT		 619
620 ox25 = x25_sk(osk);
621 x25->t21 = ox25->t21;
622 x25->t22 = ox25->t22;
623 x25->t23 = ox25->t23;
624 x25->t2 = ox25->t2;
cb863ffd 625 x25->flags = ox25->flags;
1da177e4 626 x25->facilities = ox25->facilities;
a64b7b93 627 x25->dte_facilities = ox25->dte_facilities;
cb65d506 628 x25->cudmatchlength = ox25->cudmatchlength;
1da177e4 629
b7792e34 630 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
1da177e4
LT		 631 x25_init_timers(sk);
632out:
633 return sk;
634}
635
636static int x25_release(struct socket *sock)
637{
638 struct sock *sk = sock->sk;
639 struct x25_sock *x25;
640
641 if (!sk)
77b22836 642 return 0;
1da177e4
LT		 643
644 x25 = x25_sk(sk);
645
77b22836
AB		 646 sock_hold(sk);
647 lock_sock(sk);
1da177e4
LT		 648 switch (x25->state) {
649
650 case X25_STATE_0:
651 case X25_STATE_2:
652 x25_disconnect(sk, 0, 0, 0);
77b22836 653 __x25_destroy_socket(sk);
1da177e4
LT		 654 goto out;
655
656 case X25_STATE_1:
657 case X25_STATE_3:
658 case X25_STATE_4:
659 x25_clear_queues(sk);
660 x25_write_internal(sk, X25_CLEAR_REQUEST);
661 x25_start_t23timer(sk);
662 x25->state = X25_STATE_2;
663 sk->sk_state = TCP_CLOSE;
664 sk->sk_shutdown |= SEND_SHUTDOWN;
665 sk->sk_state_change(sk);
666 sock_set_flag(sk, SOCK_DEAD);
667 sock_set_flag(sk, SOCK_DESTROY);
668 break;
669 }
670
c751e4f8 671 sock_orphan(sk);
1da177e4 672out:
77b22836
AB		 673 release_sock(sk);
674 sock_put(sk);
1da177e4
LT		 675 return 0;
676}
677
678static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
679{
680 struct sock *sk = sock->sk;
681 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
a9288525 682 int len, i, rc = 0;
1da177e4
LT		 683
684 if (!sock_flag(sk, SOCK_ZAPPED) ||
685 addr_len != sizeof(struct sockaddr_x25) ||
91774904
AB		 686 addr->sx25_family != AF_X25) {
687 rc = -EINVAL;
688 goto out;
689 }
1da177e4 690
a9288525 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 }
697 }
698
90c27297 699 lock_sock(sk);
1da177e4
LT		 700 x25_sk(sk)->source_addr = addr->sx25_addr;
701 x25_insert_socket(sk);
702 sock_reset_flag(sk, SOCK_ZAPPED);
90c27297 703 release_sock(sk);
1da177e4 704 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
91774904 705out:
91774904 706 return rc;
1da177e4
LT		 707}
708
709static int x25_wait_for_connection_establishment(struct sock *sk)
710{
711 DECLARE_WAITQUEUE(wait, current);
f8e1d201 712 int rc;
1da177e4 713
aa395145 714 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 715 for (;;) {
716 __set_current_state(TASK_INTERRUPTIBLE);
717 rc = -ERESTARTSYS;
718 if (signal_pending(current))
719 break;
720 rc = sock_error(sk);
721 if (rc) {
722 sk->sk_socket->state = SS_UNCONNECTED;
723 break;
724 }
725 rc = 0;
726 if (sk->sk_state != TCP_ESTABLISHED) {
727 release_sock(sk);
728 schedule();
729 lock_sock(sk);
730 } else
731 break;
732 }
733 __set_current_state(TASK_RUNNING);
aa395145 734 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 735 return rc;
736}
737
738static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
739 int addr_len, int flags)
740{
741 struct sock *sk = sock->sk;
742 struct x25_sock *x25 = x25_sk(sk);
743 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
744 struct x25_route *rt;
745 int rc = 0;
746
747 lock_sock(sk);
748 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
749 sock->state = SS_CONNECTED;
750 goto out; /* Connect completed during a ERESTARTSYS event */
751 }
752
753 rc = -ECONNREFUSED;
754 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
755 sock->state = SS_UNCONNECTED;
756 goto out;
757 }
758
759 rc = -EISCONN; /* No reconnect on a seqpacket socket */
760 if (sk->sk_state == TCP_ESTABLISHED)
761 goto out;
762
f8e1d201 763 sk->sk_state = TCP_CLOSE;
1da177e4
LT		 764 sock->state = SS_UNCONNECTED;
765
766 rc = -EINVAL;
767 if (addr_len != sizeof(struct sockaddr_x25) ||
768 addr->sx25_family != AF_X25)
769 goto out;
770
771 rc = -ENETUNREACH;
772 rt = x25_get_route(&addr->sx25_addr);
773 if (!rt)
774 goto out;
775
776 x25->neighbour = x25_get_neigh(rt->dev);
777 if (!x25->neighbour)
778 goto out_put_route;
779
780 x25_limit_facilities(&x25->facilities, x25->neighbour);
781
782 x25->lci = x25_new_lci(x25->neighbour);
783 if (!x25->lci)
784 goto out_put_neigh;
785
786 rc = -EINVAL;
787 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
788 goto out_put_neigh;
789
790 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
791 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
792
793 x25->dest_addr = addr->sx25_addr;
794
795 /* Move to connecting socket, start sending Connect Requests */
796 sock->state = SS_CONNECTING;
797 sk->sk_state = TCP_SYN_SENT;
798
799 x25->state = X25_STATE_1;
800
801 x25_write_internal(sk, X25_CALL_REQUEST);
802
803 x25_start_heartbeat(sk);
804 x25_start_t21timer(sk);
805
806 /* Now the loop */
807 rc = -EINPROGRESS;
808 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
809 goto out_put_neigh;
810
811 rc = x25_wait_for_connection_establishment(sk);
812 if (rc)
813 goto out_put_neigh;
814
815 sock->state = SS_CONNECTED;
816 rc = 0;
817out_put_neigh:
818 if (rc)
819 x25_neigh_put(x25->neighbour);
820out_put_route:
821 x25_route_put(rt);
822out:
823 release_sock(sk);
824 return rc;
825}
826
bac37ec8 827static int x25_wait_for_data(struct sock *sk, long timeout)
1da177e4
LT		 828{
829 DECLARE_WAITQUEUE(wait, current);
830 int rc = 0;
831
aa395145 832 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 833 for (;;) {
834 __set_current_state(TASK_INTERRUPTIBLE);
835 if (sk->sk_shutdown & RCV_SHUTDOWN)
836 break;
837 rc = -ERESTARTSYS;
838 if (signal_pending(current))
839 break;
840 rc = -EAGAIN;
841 if (!timeout)
842 break;
843 rc = 0;
844 if (skb_queue_empty(&sk->sk_receive_queue)) {
845 release_sock(sk);
846 timeout = schedule_timeout(timeout);
847 lock_sock(sk);
848 } else
849 break;
850 }
851 __set_current_state(TASK_RUNNING);
aa395145 852 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 853 return rc;
854}
f8e1d201 855
cdfbabfb
DH		 856static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
857 bool kern)
1da177e4
LT		 858{
859 struct sock *sk = sock->sk;
860 struct sock *newsk;
861 struct sk_buff *skb;
862 int rc = -EINVAL;
863
141646ce 864 if (!sk)
1da177e4
LT		 865 goto out;
866
867 rc = -EOPNOTSUPP;
868 if (sk->sk_type != SOCK_SEQPACKET)
869 goto out;
870
871 lock_sock(sk);
141646ce
AH		 872 rc = -EINVAL;
873 if (sk->sk_state != TCP_LISTEN)
874 goto out2;
875
1da177e4
LT		 876 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
877 if (rc)
878 goto out2;
879 skb = skb_dequeue(&sk->sk_receive_queue);
880 rc = -EINVAL;
881 if (!skb->sk)
882 goto out2;
883 newsk = skb->sk;
b61d38e0 884 sock_graft(newsk, newsock);
1da177e4
LT		 885
886 /* Now attach up the new socket */
887 skb->sk = NULL;
888 kfree_skb(skb);
889 sk->sk_ack_backlog--;
1da177e4
LT		 890 newsock->state = SS_CONNECTED;
891 rc = 0;
892out2:
893 release_sock(sk);
894out:
895 return rc;
896}
897
898static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
899 int *uaddr_len, int peer)
900{
901 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
902 struct sock *sk = sock->sk;
903 struct x25_sock *x25 = x25_sk(sk);
91774904 904 int rc = 0;
1da177e4
LT		 905
906 if (peer) {
91774904
AB		 907 if (sk->sk_state != TCP_ESTABLISHED) {
908 rc = -ENOTCONN;
909 goto out;
910 }
1da177e4
LT		 911 sx25->sx25_addr = x25->dest_addr;
912 } else
913 sx25->sx25_addr = x25->source_addr;
914
915 sx25->sx25_family = AF_X25;
916 *uaddr_len = sizeof(*sx25);
917
91774904 918out:
91774904
AB		 919 return rc;
920}
921
1da177e4
LT		 922int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
923 unsigned int lci)
924{
925 struct sock *sk;
926 struct sock *make;
927 struct x25_sock *makex25;
928 struct x25_address source_addr, dest_addr;
929 struct x25_facilities facilities;
a64b7b93 930 struct x25_dte_facilities dte_facilities;
95a9dc43 931 int len, addr_len, rc;
1da177e4
LT		 932
933 /*
934 * Remove the LCI and frame type.
935 */
936 skb_pull(skb, X25_STD_MIN_LEN);
937
938 /*
939 * Extract the X.25 addresses and convert them to ASCII strings,
940 * and remove them.
f5eb917b
JH		 941 *
942 * Address block is mandatory in call request packets
1da177e4 943 */
f5eb917b
JH		 944 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
945 if (addr_len <= 0)
946 goto out_clear_request;
95a9dc43 947 skb_pull(skb, addr_len);
1da177e4
LT		 948
949 /*
950 * Get the length of the facilities, skip past them for the moment
951 * get the call user data because this is needed to determine
952 * the correct listener
f5eb917b
JH		 953 *
954 * Facilities length is mandatory in call request packets
1da177e4 955 */
cb101ed2 956 if (!pskb_may_pull(skb, 1))
f5eb917b 957 goto out_clear_request;
1da177e4 958 len = skb->data[0] + 1;
cb101ed2 959 if (!pskb_may_pull(skb, len))
f5eb917b 960 goto out_clear_request;
1da177e4
LT		 961 skb_pull(skb,len);
962
c7fd0d48
MD		 963 /*
964 * Ensure that the amount of call user data is valid.
965 */
966 if (skb->len > X25_MAX_CUD_LEN)
967 goto out_clear_request;
968
cb101ed2
MD		 969 /*
970 * Get all the call user data so it can be used in
971 * x25_find_listener and skb_copy_from_linear_data up ahead.
972 */
973 if (!pskb_may_pull(skb, skb->len))
974 goto out_clear_request;
975
1da177e4
LT		 976 /*
977 * Find a listener for the particular address/cud pair.
978 */
cb65d506
SP		 979 sk = x25_find_listener(&source_addr,skb);
980 skb_push(skb,len);
1da177e4 981
95a9dc43
AH		 982 if (sk != NULL && sk_acceptq_is_full(sk)) {
983 goto out_sock_put;
984 }
985
1da177e4 986 /*
95a9dc43
AH		 987 * We dont have any listeners for this incoming call.
988 * Try forwarding it.
1da177e4 989 */
95a9dc43
AH		 990 if (sk == NULL) {
991 skb_push(skb, addr_len + X25_STD_MIN_LEN);
39e21c0d
AH		 992 if (sysctl_x25_forward &&
993 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
95a9dc43
AH		 994 {
995 /* Call was forwarded, dont process it any more */
996 kfree_skb(skb);
997 rc = 1;
998 goto out;
999 } else {
1000 /* No listeners, can't forward, clear the call */
1001 goto out_clear_request;
1002 }
1003 }
1da177e4
LT		 1004
1005 /*
1006 * Try to reach a compromise on the requested facilities.
1007 */
a64b7b93
SP		 1008 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1009 if (len == -1)
1da177e4
LT		 1010 goto out_sock_put;
1011
1012 /*
1013 * current neighbour/link might impose additional limits
1014 * on certain facilties
1015 */
1016
1017 x25_limit_facilities(&facilities, nb);
1018
1019 /*
1020 * Try to create a new socket.
1021 */
1022 make = x25_make_new(sk);
1023 if (!make)
1024 goto out_sock_put;
1025
1026 /*
1027 * Remove the facilities
1028 */
1029 skb_pull(skb, len);
1030
1031 skb->sk = make;
1032 make->sk_state = TCP_ESTABLISHED;
1033
1034 makex25 = x25_sk(make);
1035 makex25->lci = lci;
1036 makex25->dest_addr = dest_addr;
1037 makex25->source_addr = source_addr;
1038 makex25->neighbour = nb;
1039 makex25->facilities = facilities;
a64b7b93 1040 makex25->dte_facilities= dte_facilities;
1da177e4 1041 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
cb65d506
SP		 1042 /* ensure no reverse facil on accept */
1043 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
a64b7b93
SP		 1044 /* ensure no calling address extension on accept */
1045 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
cb65d506 1046 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1da177e4 1047
37cda787 1048 /* Normally all calls are accepted immediately */
1049 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
ebc3f64b
SP		 1050 x25_write_internal(make, X25_CALL_ACCEPTED);
1051 makex25->state = X25_STATE_3;
1052 }
1da177e4 1053
cb65d506
SP		 1054 /*
1055 * Incoming Call User Data.
1056 */
8db09f26
RK		 1057 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1058 makex25->calluserdata.cudlength = skb->len;
cb65d506 1059
1da177e4
LT		 1060 sk->sk_ack_backlog++;
1061
1062 x25_insert_socket(make);
1063
1064 skb_queue_head(&sk->sk_receive_queue, skb);
1065
1066 x25_start_heartbeat(make);
1067
1068 if (!sock_flag(sk, SOCK_DEAD))
676d2369 1069 sk->sk_data_ready(sk);
1da177e4
LT		 1070 rc = 1;
1071 sock_put(sk);
1072out:
1073 return rc;
1074out_sock_put:
1075 sock_put(sk);
1076out_clear_request:
1077 rc = 0;
1078 x25_transmit_clear_request(nb, lci, 0x01);
1079 goto out;
1080}
1081
1b784140 1082static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1da177e4
LT		 1083{
1084 struct sock *sk = sock->sk;
1085 struct x25_sock *x25 = x25_sk(sk);
342dfc30 1086 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1da177e4
LT		 1087 struct sockaddr_x25 sx25;
1088 struct sk_buff *skb;
1089 unsigned char *asmptr;
1090 int noblock = msg->msg_flags & MSG_DONTWAIT;
1091 size_t size;
1092 int qbit = 0, rc = -EINVAL;
1093
77b22836 1094 lock_sock(sk);
1da177e4
LT		 1095 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1096 goto out;
1097
1098 /* we currently don't support segmented records at the user interface */
1099 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1100 goto out;
1101
1102 rc = -EADDRNOTAVAIL;
1103 if (sock_flag(sk, SOCK_ZAPPED))
1104 goto out;
1105
1106 rc = -EPIPE;
1107 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1108 send_sig(SIGPIPE, current, 0);
1109 goto out;
1110 }
1111
1112 rc = -ENETUNREACH;
1113 if (!x25->neighbour)
1114 goto out;
1115
1116 if (usx25) {
1117 rc = -EINVAL;
1118 if (msg->msg_namelen < sizeof(sx25))
1119 goto out;
1120 memcpy(&sx25, usx25, sizeof(sx25));
1121 rc = -EISCONN;
1122 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1123 goto out;
1124 rc = -EINVAL;
1125 if (sx25.sx25_family != AF_X25)
1126 goto out;
1127 } else {
1128 /*
1129 * FIXME 1003.1g - if the socket is like this because
1130 * it has become closed (not started closed) we ought
1131 * to SIGPIPE, EPIPE;
1132 */
1133 rc = -ENOTCONN;
1134 if (sk->sk_state != TCP_ESTABLISHED)
1135 goto out;
1136
1137 sx25.sx25_family = AF_X25;
1138 sx25.sx25_addr = x25->dest_addr;
1139 }
1140
83e0bbcb
AC		 1141 /* Sanity check the packet size */
1142 if (len > 65535) {
1143 rc = -EMSGSIZE;
1144 goto out;
1145 }
1146
1da177e4
LT		 1147 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1148
1149 /* Build a packet */
1150 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1151
1152 if ((msg->msg_flags & MSG_OOB) && len > 32)
1153 len = 32;
1154
1155 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1156
77b22836 1157 release_sock(sk);
1da177e4 1158 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
77b22836 1159 lock_sock(sk);
1da177e4
LT		 1160 if (!skb)
1161 goto out;
1162 X25_SKB_CB(skb)->flags = msg->msg_flags;
1163
1164 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1165
1166 /*
1167 * Put the data on the end
1168 */
1169 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1170
eeeb0374
ACM		 1171 skb_reset_transport_header(skb);
1172 skb_put(skb, len);
1da177e4 1173
6ce8e9ce 1174 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1da177e4
LT		 1175 if (rc)
1176 goto out_kfree_skb;
1177
1178 /*
1179 * If the Q BIT Include socket option is in force, the first
1180 * byte of the user data is the logical value of the Q Bit.
1181 */
cb863ffd 1182 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
cb101ed2
MD		 1183 if (!pskb_may_pull(skb, 1))
1184 goto out_kfree_skb;
1185
1da177e4
LT		 1186 qbit = skb->data[0];
1187 skb_pull(skb, 1);
1188 }
1189
1190 /*
1191 * Push down the X.25 header
1192 */
1193 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1194
1195 if (msg->msg_flags & MSG_OOB) {
1196 if (x25->neighbour->extended) {
1197 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1198 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1199 *asmptr++ = (x25->lci >> 0) & 0xFF;
1200 *asmptr++ = X25_INTERRUPT;
1201 } else {
1202 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1203 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1204 *asmptr++ = (x25->lci >> 0) & 0xFF;
1205 *asmptr++ = X25_INTERRUPT;
1206 }
1207 } else {
1208 if (x25->neighbour->extended) {
1209 /* Build an Extended X.25 header */
1210 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1211 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1212 *asmptr++ = (x25->lci >> 0) & 0xFF;
1213 *asmptr++ = X25_DATA;
1214 *asmptr++ = X25_DATA;
1215 } else {
1216 /* Build an Standard X.25 header */
1217 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1218 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1219 *asmptr++ = (x25->lci >> 0) & 0xFF;
1220 *asmptr++ = X25_DATA;
1221 }
1222
1223 if (qbit)
1224 skb->data[0] |= X25_Q_BIT;
1225 }
1226
1227 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1228 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1229
1230 rc = -ENOTCONN;
1231 if (sk->sk_state != TCP_ESTABLISHED)
1232 goto out_kfree_skb;
1233
1234 if (msg->msg_flags & MSG_OOB)
1235 skb_queue_tail(&x25->interrupt_out_queue, skb);
1236 else {
8db09f26
RK		 1237 rc = x25_output(sk, skb);
1238 len = rc;
1239 if (rc < 0)
1da177e4 1240 kfree_skb(skb);
cb863ffd 1241 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1da177e4
LT		 1242 len++;
1243 }
1244
1da177e4 1245 x25_kick(sk);
1da177e4
LT		 1246 rc = len;
1247out:
77b22836 1248 release_sock(sk);
1da177e4
LT		 1249 return rc;
1250out_kfree_skb:
1251 kfree_skb(skb);
1252 goto out;
1253}
1254
1255
1b784140 1256static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1da177e4
LT		 1257 int flags)
1258{
1259 struct sock *sk = sock->sk;
1260 struct x25_sock *x25 = x25_sk(sk);
342dfc30 1261 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1da177e4 1262 size_t copied;
501e89d3 1263 int qbit, header_len;
1da177e4
LT		 1264 struct sk_buff *skb;
1265 unsigned char *asmptr;
1266 int rc = -ENOTCONN;
1267
77b22836 1268 lock_sock(sk);
501e89d3
DJ		 1269
1270 if (x25->neighbour == NULL)
1271 goto out;
1272
1273 header_len = x25->neighbour->extended ?
1274 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1275
1da177e4
LT		 1276 /*
1277 * This works for seqpacket too. The receiver has ordered the queue for
1278 * us! We do one quick check first though
1279 */
1280 if (sk->sk_state != TCP_ESTABLISHED)
1281 goto out;
1282
1283 if (flags & MSG_OOB) {
1284 rc = -EINVAL;
1285 if (sock_flag(sk, SOCK_URGINLINE) ||
1286 !skb_peek(&x25->interrupt_in_queue))
1287 goto out;
1288
1289 skb = skb_dequeue(&x25->interrupt_in_queue);
1290
cb101ed2
MD		 1291 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1292 goto out_free_dgram;
1293
1da177e4
LT		 1294 skb_pull(skb, X25_STD_MIN_LEN);
1295
1296 /*
1297 * No Q bit information on Interrupt data.
1298 */
cb863ffd 1299 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1300 asmptr = skb_push(skb, 1);
1301 *asmptr = 0x00;
1302 }
1303
1304 msg->msg_flags |= MSG_OOB;
1305 } else {
1306 /* Now we can treat all alike */
77b22836 1307 release_sock(sk);
1da177e4
LT		 1308 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1309 flags & MSG_DONTWAIT, &rc);
77b22836 1310 lock_sock(sk);
1da177e4
LT		 1311 if (!skb)
1312 goto out;
1313
cb101ed2
MD		 1314 if (!pskb_may_pull(skb, header_len))
1315 goto out_free_dgram;
1316
1da177e4
LT		 1317 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1318
cb101ed2 1319 skb_pull(skb, header_len);
1da177e4 1320
cb863ffd 1321 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1322 asmptr = skb_push(skb, 1);
1323 *asmptr = qbit;
1324 }
1325 }
1326
badff6d0 1327 skb_reset_transport_header(skb);
1da177e4
LT		 1328 copied = skb->len;
1329
1330 if (copied > size) {
1331 copied = size;
1332 msg->msg_flags |= MSG_TRUNC;
1333 }
1334
f8e1d201 1335 /* Currently, each datagram always contains a complete record */
1da177e4
LT		 1336 msg->msg_flags |= MSG_EOR;
1337
51f3d02b 1338 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1da177e4
LT		 1339 if (rc)
1340 goto out_free_dgram;
1341
1342 if (sx25) {
1343 sx25->sx25_family = AF_X25;
1344 sx25->sx25_addr = x25->dest_addr;
f3d33426 1345 msg->msg_namelen = sizeof(*sx25);
1da177e4
LT		 1346 }
1347
1da177e4 1348 x25_check_rbuf(sk);
1da177e4
LT		 1349 rc = copied;
1350out_free_dgram:
1351 skb_free_datagram(sk, skb);
1352out:
77b22836 1353 release_sock(sk);
1da177e4
LT		 1354 return rc;
1355}
1356
1357
1358static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1359{
1360 struct sock *sk = sock->sk;
1361 struct x25_sock *x25 = x25_sk(sk);
1362 void __user *argp = (void __user *)arg;
1363 int rc;
1364
1365 switch (cmd) {
fddc5f3e
JP		 1366 case TIOCOUTQ: {
1367 int amount;
1368
1369 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1370 if (amount < 0)
1371 amount = 0;
1372 rc = put_user(amount, (unsigned int __user *)argp);
1373 break;
1374 }
1da177e4 1375
fddc5f3e
JP		 1376 case TIOCINQ: {
1377 struct sk_buff *skb;
1378 int amount = 0;
1379 /*
1380 * These two are safe on a single CPU system as
1381 * only user tasks fiddle here
1382 */
1383 lock_sock(sk);
1384 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1385 amount = skb->len;
1386 release_sock(sk);
1387 rc = put_user(amount, (unsigned int __user *)argp);
1388 break;
1389 }
1da177e4 1390
fddc5f3e
JP		 1391 case SIOCGSTAMP:
1392 rc = -EINVAL;
1393 if (sk)
1394 rc = sock_get_timestamp(sk,
f8e1d201 1395 (struct timeval __user *)argp);
fddc5f3e
JP		 1396 break;
1397 case SIOCGSTAMPNS:
1398 rc = -EINVAL;
1399 if (sk)
1400 rc = sock_get_timestampns(sk,
1401 (struct timespec __user *)argp);
1402 break;
1403 case SIOCGIFADDR:
1404 case SIOCSIFADDR:
1405 case SIOCGIFDSTADDR:
1406 case SIOCSIFDSTADDR:
1407 case SIOCGIFBRDADDR:
1408 case SIOCSIFBRDADDR:
1409 case SIOCGIFNETMASK:
1410 case SIOCSIFNETMASK:
1411 case SIOCGIFMETRIC:
1412 case SIOCSIFMETRIC:
1413 rc = -EINVAL;
1414 break;
1415 case SIOCADDRT:
1416 case SIOCDELRT:
1417 rc = -EPERM;
1418 if (!capable(CAP_NET_ADMIN))
1da177e4 1419 break;
fddc5f3e
JP		 1420 rc = x25_route_ioctl(cmd, argp);
1421 break;
1422 case SIOCX25GSUBSCRIP:
1423 rc = x25_subscr_ioctl(cmd, argp);
1424 break;
1425 case SIOCX25SSUBSCRIP:
1426 rc = -EPERM;
1427 if (!capable(CAP_NET_ADMIN))
1da177e4 1428 break;
fddc5f3e
JP		 1429 rc = x25_subscr_ioctl(cmd, argp);
1430 break;
1431 case SIOCX25GFACILITIES: {
1432 lock_sock(sk);
1433 rc = copy_to_user(argp, &x25->facilities,
1434 sizeof(x25->facilities))
1435 ? -EFAULT : 0;
1436 release_sock(sk);
1437 break;
1438 }
1da177e4 1439
fddc5f3e
JP		 1440 case SIOCX25SFACILITIES: {
1441 struct x25_facilities facilities;
1442 rc = -EFAULT;
1443 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1444 break;
1445 rc = -EINVAL;
1446 lock_sock(sk);
1447 if (sk->sk_state != TCP_LISTEN &&
1448 sk->sk_state != TCP_CLOSE)
1449 goto out_fac_release;
1450 if (facilities.pacsize_in < X25_PS16 ||
1451 facilities.pacsize_in > X25_PS4096)
1452 goto out_fac_release;
1453 if (facilities.pacsize_out < X25_PS16 ||
1454 facilities.pacsize_out > X25_PS4096)
1455 goto out_fac_release;
1456 if (facilities.winsize_in < 1 ||
1457 facilities.winsize_in > 127)
1458 goto out_fac_release;
1459 if (facilities.throughput) {
1460 int out = facilities.throughput & 0xf0;
1461 int in = facilities.throughput & 0x0f;
1462 if (!out)
1463 facilities.throughput |=
1464 X25_DEFAULT_THROUGHPUT << 4;
1465 else if (out < 0x30 || out > 0xD0)
f90de660 1466 goto out_fac_release;
fddc5f3e
JP		 1467 if (!in)
1468 facilities.throughput |=
1469 X25_DEFAULT_THROUGHPUT;
1470 else if (in < 0x03 || in > 0x0D)
f90de660 1471 goto out_fac_release;
f8e1d201 1472 }
fddc5f3e
JP		 1473 if (facilities.reverse &&
1474 (facilities.reverse & 0x81) != 0x81)
1475 goto out_fac_release;
1476 x25->facilities = facilities;
1477 rc = 0;
1478out_fac_release:
1479 release_sock(sk);
1480 break;
1481 }
a64b7b93 1482
fddc5f3e
JP		 1483 case SIOCX25GDTEFACILITIES: {
1484 lock_sock(sk);
1485 rc = copy_to_user(argp, &x25->dte_facilities,
1486 sizeof(x25->dte_facilities));
1487 release_sock(sk);
1488 if (rc)
f8e1d201 1489 rc = -EFAULT;
fddc5f3e
JP		 1490 break;
1491 }
a64b7b93 1492
fddc5f3e
JP		 1493 case SIOCX25SDTEFACILITIES: {
1494 struct x25_dte_facilities dtefacs;
1495 rc = -EFAULT;
1496 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1da177e4 1497 break;
fddc5f3e
JP		 1498 rc = -EINVAL;
1499 lock_sock(sk);
1500 if (sk->sk_state != TCP_LISTEN &&
1501 sk->sk_state != TCP_CLOSE)
1502 goto out_dtefac_release;
1503 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1504 goto out_dtefac_release;
fddc5f3e 1505 if (dtefacs.called_len > X25_MAX_AE_LEN)
fddc5f3e
JP		 1506 goto out_dtefac_release;
1507 x25->dte_facilities = dtefacs;
1508 rc = 0;
1509out_dtefac_release:
1510 release_sock(sk);
1511 break;
1512 }
1da177e4 1513
fddc5f3e
JP		 1514 case SIOCX25GCALLUSERDATA: {
1515 lock_sock(sk);
1516 rc = copy_to_user(argp, &x25->calluserdata,
1517 sizeof(x25->calluserdata))
1518 ? -EFAULT : 0;
1519 release_sock(sk);
1520 break;
1521 }
1da177e4 1522
fddc5f3e
JP		 1523 case SIOCX25SCALLUSERDATA: {
1524 struct x25_calluserdata calluserdata;
1da177e4 1525
fddc5f3e
JP		 1526 rc = -EFAULT;
1527 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1da177e4 1528 break;
fddc5f3e
JP		 1529 rc = -EINVAL;
1530 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1531 break;
1532 lock_sock(sk);
1533 x25->calluserdata = calluserdata;
1534 release_sock(sk);
1535 rc = 0;
1536 break;
1537 }
1da177e4 1538
fddc5f3e
JP		 1539 case SIOCX25GCAUSEDIAG: {
1540 lock_sock(sk);
1541 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1542 ? -EFAULT : 0;
1543 release_sock(sk);
1544 break;
1545 }
1546
1547 case SIOCX25SCAUSEDIAG: {
1548 struct x25_causediag causediag;
1549 rc = -EFAULT;
1550 if (copy_from_user(&causediag, argp, sizeof(causediag)))
386e50cc 1551 break;
fddc5f3e
JP		 1552 lock_sock(sk);
1553 x25->causediag = causediag;
1554 release_sock(sk);
1555 rc = 0;
1556 break;
386e50cc 1557
fddc5f3e 1558 }
386e50cc 1559
fddc5f3e
JP		 1560 case SIOCX25SCUDMATCHLEN: {
1561 struct x25_subaddr sub_addr;
1562 rc = -EINVAL;
1563 lock_sock(sk);
1564 if(sk->sk_state != TCP_CLOSE)
1565 goto out_cud_release;
1566 rc = -EFAULT;
1567 if (copy_from_user(&sub_addr, argp,
1568 sizeof(sub_addr)))
1569 goto out_cud_release;
1570 rc = -EINVAL;
1571 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1572 goto out_cud_release;
1573 x25->cudmatchlength = sub_addr.cudmatchlength;
1574 rc = 0;
3f0a069a 1575out_cud_release:
fddc5f3e
JP		 1576 release_sock(sk);
1577 break;
1578 }
cb65d506 1579
fddc5f3e
JP		 1580 case SIOCX25CALLACCPTAPPRV: {
1581 rc = -EINVAL;
1582 lock_sock(sk);
4ccb93ce
DJ		 1583 if (sk->sk_state == TCP_CLOSE) {
1584 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1585 rc = 0;
1586 }
fddc5f3e 1587 release_sock(sk);
fddc5f3e
JP		 1588 break;
1589 }
ebc3f64b 1590
fddc5f3e
JP		 1591 case SIOCX25SENDCALLACCPT: {
1592 rc = -EINVAL;
1593 lock_sock(sk);
1594 if (sk->sk_state != TCP_ESTABLISHED)
4ccb93ce 1595 goto out_sendcallaccpt_release;
fddc5f3e
JP		 1596 /* must call accptapprv above */
1597 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
4ccb93ce 1598 goto out_sendcallaccpt_release;
fddc5f3e
JP		 1599 x25_write_internal(sk, X25_CALL_ACCEPTED);
1600 x25->state = X25_STATE_3;
fddc5f3e 1601 rc = 0;
4ccb93ce
DJ		 1602out_sendcallaccpt_release:
1603 release_sock(sk);
fddc5f3e
JP		 1604 break;
1605 }
1606
1607 default:
1608 rc = -ENOIOCTLCMD;
1609 break;
1da177e4
LT		 1610 }
1611
1612 return rc;
1613}
1614
ec1b4cf7 1615static const struct net_proto_family x25_family_ops = {
1da177e4
LT		 1616 .family = AF_X25,
1617 .create = x25_create,
1618 .owner = THIS_MODULE,
1619};
1620
1b06e6ba
SP		 1621#ifdef CONFIG_COMPAT
1622static int compat_x25_subscr_ioctl(unsigned int cmd,
1623 struct compat_x25_subscrip_struct __user *x25_subscr32)
1624{
1625 struct compat_x25_subscrip_struct x25_subscr;
1626 struct x25_neigh *nb;
1627 struct net_device *dev;
1628 int rc = -EINVAL;
1629
1630 rc = -EFAULT;
1631 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1632 goto out;
1633
1634 rc = -EINVAL;
1635 dev = x25_dev_get(x25_subscr.device);
1636 if (dev == NULL)
1637 goto out;
1638
1639 nb = x25_get_neigh(dev);
1640 if (nb == NULL)
1641 goto out_dev_put;
1642
1643 dev_put(dev);
1644
1645 if (cmd == SIOCX25GSUBSCRIP) {
5595a1a5 1646 read_lock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1647 x25_subscr.extended = nb->extended;
1648 x25_subscr.global_facil_mask = nb->global_facil_mask;
5595a1a5 1649 read_unlock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1650 rc = copy_to_user(x25_subscr32, &x25_subscr,
1651 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1652 } else {
1653 rc = -EINVAL;
1654 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1655 rc = 0;
5595a1a5 1656 write_lock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1657 nb->extended = x25_subscr.extended;
1658 nb->global_facil_mask = x25_subscr.global_facil_mask;
5595a1a5 1659 write_unlock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1660 }
1661 }
1662 x25_neigh_put(nb);
1663out:
1664 return rc;
1665out_dev_put:
1666 dev_put(dev);
1667 goto out;
1668}
1669
1670static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1671 unsigned long arg)
1672{
1673 void __user *argp = compat_ptr(arg);
1674 struct sock *sk = sock->sk;
1675
1676 int rc = -ENOIOCTLCMD;
1677
1678 switch(cmd) {
1679 case TIOCOUTQ:
1680 case TIOCINQ:
1681 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1682 break;
1683 case SIOCGSTAMP:
1684 rc = -EINVAL;
1685 if (sk)
1686 rc = compat_sock_get_timestamp(sk,
1687 (struct timeval __user*)argp);
1688 break;
ae40eb1e
ED		 1689 case SIOCGSTAMPNS:
1690 rc = -EINVAL;
1691 if (sk)
1692 rc = compat_sock_get_timestampns(sk,
1693 (struct timespec __user*)argp);
1694 break;
1b06e6ba
SP		 1695 case SIOCGIFADDR:
1696 case SIOCSIFADDR:
1697 case SIOCGIFDSTADDR:
1698 case SIOCSIFDSTADDR:
1699 case SIOCGIFBRDADDR:
1700 case SIOCSIFBRDADDR:
1701 case SIOCGIFNETMASK:
1702 case SIOCSIFNETMASK:
1703 case SIOCGIFMETRIC:
1704 case SIOCSIFMETRIC:
1705 rc = -EINVAL;
1706 break;
1707 case SIOCADDRT:
1708 case SIOCDELRT:
1709 rc = -EPERM;
1710 if (!capable(CAP_NET_ADMIN))
1711 break;
1712 rc = x25_route_ioctl(cmd, argp);
1713 break;
1714 case SIOCX25GSUBSCRIP:
1715 rc = compat_x25_subscr_ioctl(cmd, argp);
1716 break;
1717 case SIOCX25SSUBSCRIP:
1718 rc = -EPERM;
1719 if (!capable(CAP_NET_ADMIN))
1720 break;
1721 rc = compat_x25_subscr_ioctl(cmd, argp);
1722 break;
1723 case SIOCX25GFACILITIES:
1724 case SIOCX25SFACILITIES:
9a6b9f2e
SP		 1725 case SIOCX25GDTEFACILITIES:
1726 case SIOCX25SDTEFACILITIES:
1b06e6ba
SP		 1727 case SIOCX25GCALLUSERDATA:
1728 case SIOCX25SCALLUSERDATA:
1729 case SIOCX25GCAUSEDIAG:
386e50cc 1730 case SIOCX25SCAUSEDIAG:
1b06e6ba
SP		 1731 case SIOCX25SCUDMATCHLEN:
1732 case SIOCX25CALLACCPTAPPRV:
1733 case SIOCX25SENDCALLACCPT:
1734 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1735 break;
1736 default:
1737 rc = -ENOIOCTLCMD;
1738 break;
1739 }
1740 return rc;
1741}
1742#endif
1743
91774904 1744static const struct proto_ops x25_proto_ops = {
1da177e4
LT		 1745 .family = AF_X25,
1746 .owner = THIS_MODULE,
1747 .release = x25_release,
1748 .bind = x25_bind,
1749 .connect = x25_connect,
1750 .socketpair = sock_no_socketpair,
1751 .accept = x25_accept,
1752 .getname = x25_getname,
768190fd 1753 .poll = datagram_poll,
1da177e4 1754 .ioctl = x25_ioctl,
1b06e6ba
SP		 1755#ifdef CONFIG_COMPAT
1756 .compat_ioctl = compat_x25_ioctl,
1757#endif
1da177e4
LT		 1758 .listen = x25_listen,
1759 .shutdown = sock_no_shutdown,
1760 .setsockopt = x25_setsockopt,
1761 .getsockopt = x25_getsockopt,
1762 .sendmsg = x25_sendmsg,
1763 .recvmsg = x25_recvmsg,
1764 .mmap = sock_no_mmap,
1765 .sendpage = sock_no_sendpage,
1766};
1767
7546dd97 1768static struct packet_type x25_packet_type __read_mostly = {
09640e63 1769 .type = cpu_to_be16(ETH_P_X25),
1da177e4
LT		 1770 .func = x25_lapb_receive_frame,
1771};
1772
1773static struct notifier_block x25_dev_notifier = {
1774 .notifier_call = x25_device_event,
1775};
1776
1777void x25_kill_by_neigh(struct x25_neigh *nb)
1778{
1779 struct sock *s;
1da177e4
LT		 1780
1781 write_lock_bh(&x25_list_lock);
1782
b67bfe0d 1783 sk_for_each(s, &x25_list)
1da177e4
LT		 1784 if (x25_sk(s)->neighbour == nb)
1785 x25_disconnect(s, ENETUNREACH, 0, 0);
1786
1787 write_unlock_bh(&x25_list_lock);
95a9dc43
AH		 1788
1789 /* Remove any related forwards */
1790 x25_clear_forward_by_dev(nb->dev);
1da177e4
LT		 1791}
1792
1793static int __init x25_init(void)
1794{
64df6d52 1795 int rc;
1da177e4 1796
64df6d52 1797 rc = proto_register(&x25_proto, 0);
1798 if (rc)
1da177e4
LT		 1799 goto out;
1800
1fd975a0 1801 rc = sock_register(&x25_family_ops);
64df6d52 1802 if (rc)
1fd975a0 1803 goto out_proto;
1da177e4
LT		 1804
1805 dev_add_pack(&x25_packet_type);
1806
1fd975a0 1807 rc = register_netdevice_notifier(&x25_dev_notifier);
64df6d52 1808 if (rc)
1fd975a0 1809 goto out_sock;
1da177e4 1810
64df6d52 1811 rc = x25_register_sysctl();
1812 if (rc)
1813 goto out_dev;
1da177e4 1814
1fd975a0 1815 rc = x25_proc_init();
64df6d52 1816 if (rc)
1817 goto out_sysctl;
1818
1819 pr_info("Linux Version 0.2\n");
1820
1da177e4
LT		 1821out:
1822 return rc;
64df6d52 1823out_sysctl:
1824 x25_unregister_sysctl();
1fd975a0 1825out_dev:
1826 unregister_netdevice_notifier(&x25_dev_notifier);
1827out_sock:
64df6d52 1828 dev_remove_pack(&x25_packet_type);
1fd975a0 1829 sock_unregister(AF_X25);
1830out_proto:
1831 proto_unregister(&x25_proto);
1832 goto out;
1da177e4
LT		 1833}
1834module_init(x25_init);
1835
1836static void __exit x25_exit(void)
1837{
1838 x25_proc_exit();
1839 x25_link_free();
1840 x25_route_free();
1841
1da177e4 1842 x25_unregister_sysctl();
1da177e4
LT		 1843
1844 unregister_netdevice_notifier(&x25_dev_notifier);
1845
1846 dev_remove_pack(&x25_packet_type);
1847
1848 sock_unregister(AF_X25);
1849 proto_unregister(&x25_proto);
1850}
1851module_exit(x25_exit);
1852
1853MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1854MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1855MODULE_LICENSE("GPL");
1856MODULE_ALIAS_NETPROTO(PF_X25);
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