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Merge tag 'rpmsg-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/remoteproc...
[linux-block.git] / net / x25 / af_x25.c
CommitLineData
ee5d8f4d 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * X.25 Packet Layer release 002
4 *
5 * This is ALPHA test software. This code may break your machine,
6 * randomly fail to work with new releases, misbehave and/or generally
f8e1d201 7 * screw up. It might even work.
1da177e4
LT		 8 *
9 * This code REQUIRES 2.1.15 or higher
10 *
1da177e4
LT		 11 * History
12 * X.25 001 Jonathan Naylor Started coding.
13 * X.25 002 Jonathan Naylor Centralised disconnect handling.
14 * New timer architecture.
15 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
f8e1d201
YH		 16 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
17 * facilities negotiation and increased
1da177e4
LT		 18 * the throughput upper limit.
19 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
f8e1d201 20 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
1da177e4
LT		 21 * Fixed x25_output() related skb leakage.
22 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
23 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
24 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
25 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
26 * x25_proc.c, using seq_file
cb65d506
SP		 27 * 2005-04-02 Shaun Pereira Selective sub address matching
28 * with call user data
ebc3f64b
SP		 29 * 2005-04-15 Shaun Pereira Fast select with no restriction on
30 * response
1da177e4
LT		 31 */
32
b73e9e3c 33#define pr_fmt(fmt) "X25: " fmt
34
1da177e4 35#include <linux/module.h>
4fc268d2 36#include <linux/capability.h>
1da177e4
LT		 37#include <linux/errno.h>
38#include <linux/kernel.h>
3f07c014 39#include <linux/sched/signal.h>
1da177e4
LT		 40#include <linux/timer.h>
41#include <linux/string.h>
42#include <linux/net.h>
43#include <linux/netdevice.h>
44#include <linux/if_arp.h>
45#include <linux/skbuff.h>
5a0e3ad6 46#include <linux/slab.h>
1da177e4 47#include <net/sock.h>
c752f073 48#include <net/tcp_states.h>
7c0f6ba6 49#include <linux/uaccess.h>
1da177e4
LT		 50#include <linux/fcntl.h>
51#include <linux/termios.h> /* For TIOCINQ/OUTQ */
52#include <linux/notifier.h>
53#include <linux/init.h>
1b06e6ba 54#include <linux/compat.h>
a9288525 55#include <linux/ctype.h>
1b06e6ba 56
1da177e4 57#include <net/x25.h>
1b06e6ba 58#include <net/compat.h>
1da177e4
LT		 59
60int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
61int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
62int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
63int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
64int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
39e21c0d 65int sysctl_x25_forward = 0;
1da177e4
LT		 66
67HLIST_HEAD(x25_list);
68DEFINE_RWLOCK(x25_list_lock);
69
90ddc4f0 70static const struct proto_ops x25_proto_ops;
1da177e4 71
e9e6c232 72static const struct x25_address null_x25_address = {" "};
1da177e4 73
1b06e6ba
SP		 74#ifdef CONFIG_COMPAT
75struct compat_x25_subscrip_struct {
76 char device[200-sizeof(compat_ulong_t)];
77 compat_ulong_t global_facil_mask;
78 compat_uint_t extended;
79};
80#endif
81
f5eb917b
JH		 82
83int x25_parse_address_block(struct sk_buff *skb,
84 struct x25_address *called_addr,
85 struct x25_address *calling_addr)
86{
87 unsigned char len;
88 int needed;
89 int rc;
90
cb101ed2 91 if (!pskb_may_pull(skb, 1)) {
f5eb917b
JH		 92 /* packet has no address block */
93 rc = 0;
94 goto empty;
95 }
96
97 len = *skb->data;
d449ba3d 98 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
f5eb917b 99
cb101ed2 100 if (!pskb_may_pull(skb, needed)) {
f5eb917b
JH		 101 /* packet is too short to hold the addresses it claims
102 to hold */
103 rc = -1;
104 goto empty;
105 }
106
107 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
108
109empty:
110 *called_addr->x25_addr = 0;
111 *calling_addr->x25_addr = 0;
112
113 return rc;
114}
115
116
1da177e4
LT		 117int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
118 struct x25_address *calling_addr)
119{
6bf1574e 120 unsigned int called_len, calling_len;
1da177e4 121 char *called, *calling;
6bf1574e 122 unsigned int i;
1da177e4
LT		 123
124 called_len = (*p >> 0) & 0x0F;
125 calling_len = (*p >> 4) & 0x0F;
126
127 called = called_addr->x25_addr;
128 calling = calling_addr->x25_addr;
129 p++;
130
131 for (i = 0; i < (called_len + calling_len); i++) {
132 if (i < called_len) {
133 if (i % 2 != 0) {
134 *called++ = ((*p >> 0) & 0x0F) + '0';
135 p++;
136 } else {
137 *called++ = ((*p >> 4) & 0x0F) + '0';
138 }
139 } else {
140 if (i % 2 != 0) {
141 *calling++ = ((*p >> 0) & 0x0F) + '0';
142 p++;
143 } else {
144 *calling++ = ((*p >> 4) & 0x0F) + '0';
145 }
146 }
147 }
148
149 *called = *calling = '\0';
150
151 return 1 + (called_len + calling_len + 1) / 2;
152}
153
154int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
155 struct x25_address *calling_addr)
156{
157 unsigned int called_len, calling_len;
158 char *called, *calling;
159 int i;
160
161 called = called_addr->x25_addr;
162 calling = calling_addr->x25_addr;
163
164 called_len = strlen(called);
165 calling_len = strlen(calling);
166
167 *p++ = (calling_len << 4) | (called_len << 0);
168
169 for (i = 0; i < (called_len + calling_len); i++) {
170 if (i < called_len) {
171 if (i % 2 != 0) {
172 *p |= (*called++ - '0') << 0;
173 p++;
174 } else {
175 *p = 0x00;
176 *p |= (*called++ - '0') << 4;
177 }
178 } else {
179 if (i % 2 != 0) {
180 *p |= (*calling++ - '0') << 0;
181 p++;
182 } else {
183 *p = 0x00;
184 *p |= (*calling++ - '0') << 4;
185 }
186 }
187 }
188
189 return 1 + (called_len + calling_len + 1) / 2;
190}
191
192/*
193 * Socket removal during an interrupt is now safe.
194 */
195static void x25_remove_socket(struct sock *sk)
196{
197 write_lock_bh(&x25_list_lock);
198 sk_del_node_init(sk);
199 write_unlock_bh(&x25_list_lock);
200}
201
1da177e4
LT		 202/*
203 * Handle device status changes.
204 */
205static int x25_device_event(struct notifier_block *this, unsigned long event,
206 void *ptr)
207{
351638e7 208 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1da177e4
LT		 209 struct x25_neigh *nb;
210
721499e8 211 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB		 212 return NOTIFY_DONE;
213
13458ffe 214 if (dev->type == ARPHRD_X25) {
1da177e4 215 switch (event) {
7eed751b
MS		 216 case NETDEV_REGISTER:
217 case NETDEV_POST_TYPE_CHANGE:
fddc5f3e
JP		 218 x25_link_device_up(dev);
219 break;
7eed751b 220 case NETDEV_DOWN:
fddc5f3e
JP		 221 nb = x25_get_neigh(dev);
222 if (nb) {
7eed751b 223 x25_link_terminated(nb);
fddc5f3e
JP		 224 x25_neigh_put(nb);
225 }
fddc5f3e 226 x25_route_device_down(dev);
7eed751b
MS		 227 break;
228 case NETDEV_PRE_TYPE_CHANGE:
229 case NETDEV_UNREGISTER:
fddc5f3e
JP		 230 x25_link_device_down(dev);
231 break;
7eed751b
MS		 232 case NETDEV_CHANGE:
233 if (!netif_carrier_ok(dev)) {
234 nb = x25_get_neigh(dev);
235 if (nb) {
236 x25_link_terminated(nb);
237 x25_neigh_put(nb);
238 }
239 }
240 break;
1da177e4
LT		 241 }
242 }
243
244 return NOTIFY_DONE;
245}
246
247/*
248 * Add a socket to the bound sockets list.
249 */
250static void x25_insert_socket(struct sock *sk)
251{
252 write_lock_bh(&x25_list_lock);
253 sk_add_node(sk, &x25_list);
254 write_unlock_bh(&x25_list_lock);
255}
256
257/*
258 * Find a socket that wants to accept the Call Request we just
259 * received. Check the full list for an address/cud match.
260 * If no cuds match return the next_best thing, an address match.
261 * Note: if a listening socket has cud set it must only get calls
262 * with matching cud.
263 */
cb65d506
SP		 264static struct sock *x25_find_listener(struct x25_address *addr,
265 struct sk_buff *skb)
1da177e4
LT		 266{
267 struct sock *s;
268 struct sock *next_best;
1da177e4
LT		 269
270 read_lock_bh(&x25_list_lock);
271 next_best = NULL;
272
b67bfe0d 273 sk_for_each(s, &x25_list)
1da177e4 274 if ((!strcmp(addr->x25_addr,
cb65d506 275 x25_sk(s)->source_addr.x25_addr) ||
06137619 276 !strcmp(x25_sk(s)->source_addr.x25_addr,
cb65d506
SP		 277 null_x25_address.x25_addr)) &&
278 s->sk_state == TCP_LISTEN) {
1da177e4
LT		 279 /*
280 * Found a listening socket, now check the incoming
281 * call user data vs this sockets call user data
282 */
7f81e25b
MD		 283 if (x25_sk(s)->cudmatchlength > 0 &&
284 skb->len >= x25_sk(s)->cudmatchlength) {
f8e1d201
YH		 285 if((memcmp(x25_sk(s)->calluserdata.cuddata,
286 skb->data,
cb65d506
SP		 287 x25_sk(s)->cudmatchlength)) == 0) {
288 sock_hold(s);
289 goto found;
290 }
291 } else
1da177e4 292 next_best = s;
1da177e4
LT		 293 }
294 if (next_best) {
295 s = next_best;
296 sock_hold(s);
297 goto found;
298 }
299 s = NULL;
300found:
301 read_unlock_bh(&x25_list_lock);
302 return s;
303}
304
305/*
306 * Find a connected X.25 socket given my LCI and neighbour.
307 */
308static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
309{
310 struct sock *s;
1da177e4 311
b67bfe0d 312 sk_for_each(s, &x25_list)
1da177e4
LT		 313 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
314 sock_hold(s);
315 goto found;
316 }
317 s = NULL;
318found:
319 return s;
320}
321
322struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
323{
324 struct sock *s;
325
326 read_lock_bh(&x25_list_lock);
327 s = __x25_find_socket(lci, nb);
328 read_unlock_bh(&x25_list_lock);
329 return s;
330}
331
332/*
333 * Find a unique LCI for a given device.
334 */
335static unsigned int x25_new_lci(struct x25_neigh *nb)
336{
337 unsigned int lci = 1;
338 struct sock *sk;
339
cf657d22 340 while ((sk = x25_find_socket(lci, nb)) != NULL) {
1da177e4
LT		 341 sock_put(sk);
342 if (++lci == 4096) {
343 lci = 0;
344 break;
345 }
cf657d22 346 cond_resched();
1da177e4
LT		 347 }
348
1da177e4
LT		 349 return lci;
350}
351
352/*
353 * Deferred destroy.
354 */
14ebaf81 355static void __x25_destroy_socket(struct sock *);
1da177e4
LT		 356
357/*
358 * handler for deferred kills.
359 */
99767f27 360static void x25_destroy_timer(struct timer_list *t)
1da177e4 361{
99767f27
KC		 362 struct sock *sk = from_timer(sk, t, sk_timer);
363
364 x25_destroy_socket_from_timer(sk);
1da177e4
LT		 365}
366
367/*
368 * This is called from user mode and the timers. Thus it protects itself
db67f249 369 * against interrupting users but doesn't worry about being called during
1da177e4
LT		 370 * work. Once it is removed from the queue no interrupt or bottom half
371 * will touch it and we are (fairly 8-) ) safe.
372 * Not static as it's used by the timer
373 */
14ebaf81 374static void __x25_destroy_socket(struct sock *sk)
1da177e4
LT		 375{
376 struct sk_buff *skb;
377
1da177e4
LT		 378 x25_stop_heartbeat(sk);
379 x25_stop_timer(sk);
380
381 x25_remove_socket(sk);
382 x25_clear_queues(sk); /* Flush the queues */
383
384 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
385 if (skb->sk != sk) { /* A pending connection */
386 /*
387 * Queue the unaccepted socket for death
388 */
2cec6b01 389 skb->sk->sk_state = TCP_LISTEN;
1da177e4
LT		 390 sock_set_flag(skb->sk, SOCK_DEAD);
391 x25_start_heartbeat(skb->sk);
392 x25_sk(skb->sk)->state = X25_STATE_0;
393 }
394
395 kfree_skb(skb);
396 }
397
c564039f 398 if (sk_has_allocations(sk)) {
1da177e4
LT		 399 /* Defer: outstanding buffers */
400 sk->sk_timer.expires = jiffies + 10 * HZ;
841b86f3 401 sk->sk_timer.function = x25_destroy_timer;
1da177e4
LT		 402 add_timer(&sk->sk_timer);
403 } else {
404 /* drop last reference so sock_put will free */
405 __sock_put(sk);
406 }
14ebaf81 407}
1da177e4 408
14ebaf81
DM		 409void x25_destroy_socket_from_timer(struct sock *sk)
410{
411 sock_hold(sk);
412 bh_lock_sock(sk);
413 __x25_destroy_socket(sk);
414 bh_unlock_sock(sk);
415 sock_put(sk);
416}
417
1da177e4
LT		 418/*
419 * Handling for system calls applied via the various interfaces to a
420 * X.25 socket object.
421 */
422
423static int x25_setsockopt(struct socket *sock, int level, int optname,
a7b75c5a 424 sockptr_t optval, unsigned int optlen)
1da177e4
LT		 425{
426 int opt;
427 struct sock *sk = sock->sk;
428 int rc = -ENOPROTOOPT;
429
430 if (level != SOL_X25 || optname != X25_QBITINCL)
431 goto out;
432
433 rc = -EINVAL;
434 if (optlen < sizeof(int))
435 goto out;
436
437 rc = -EFAULT;
a7b75c5a 438 if (copy_from_sockptr(&opt, optval, sizeof(int)))
1da177e4
LT		 439 goto out;
440
cb863ffd 441 if (opt)
442 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
443 else
444 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 445 rc = 0;
446out:
447 return rc;
448}
449
450static int x25_getsockopt(struct socket *sock, int level, int optname,
451 char __user *optval, int __user *optlen)
452{
453 struct sock *sk = sock->sk;
454 int val, len, rc = -ENOPROTOOPT;
f8e1d201 455
1da177e4
LT		 456 if (level != SOL_X25 || optname != X25_QBITINCL)
457 goto out;
458
459 rc = -EFAULT;
460 if (get_user(len, optlen))
461 goto out;
462
463 len = min_t(unsigned int, len, sizeof(int));
464
465 rc = -EINVAL;
466 if (len < 0)
467 goto out;
f8e1d201 468
1da177e4
LT		 469 rc = -EFAULT;
470 if (put_user(len, optlen))
471 goto out;
472
cb863ffd 473 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 474 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
475out:
476 return rc;
477}
478
479static int x25_listen(struct socket *sock, int backlog)
480{
481 struct sock *sk = sock->sk;
482 int rc = -EOPNOTSUPP;
483
25aa4efe 484 lock_sock(sk);
f2b0b521
HK		 485 if (sock->state != SS_UNCONNECTED) {
486 rc = -EINVAL;
487 release_sock(sk);
488 return rc;
489 }
490
1da177e4
LT		 491 if (sk->sk_state != TCP_LISTEN) {
492 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
493 sk->sk_max_ack_backlog = backlog;
494 sk->sk_state = TCP_LISTEN;
495 rc = 0;
496 }
25aa4efe 497 release_sock(sk);
1da177e4
LT		 498
499 return rc;
500}
501
502static struct proto x25_proto = {
503 .name = "X25",
504 .owner = THIS_MODULE,
505 .obj_size = sizeof(struct x25_sock),
506};
507
11aa9c28 508static struct sock *x25_alloc_socket(struct net *net, int kern)
1da177e4
LT		 509{
510 struct x25_sock *x25;
11aa9c28 511 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
1da177e4
LT		 512
513 if (!sk)
514 goto out;
515
516 sock_init_data(NULL, sk);
517
518 x25 = x25_sk(sk);
519 skb_queue_head_init(&x25->ack_queue);
520 skb_queue_head_init(&x25->fragment_queue);
521 skb_queue_head_init(&x25->interrupt_in_queue);
522 skb_queue_head_init(&x25->interrupt_out_queue);
523out:
524 return sk;
525}
526
3f378b68
EP		 527static int x25_create(struct net *net, struct socket *sock, int protocol,
528 int kern)
1da177e4
LT		 529{
530 struct sock *sk;
531 struct x25_sock *x25;
b18e7a06 532 int rc = -EAFNOSUPPORT;
1da177e4 533
09ad9bc7 534 if (!net_eq(net, &init_net))
b18e7a06 535 goto out;
536
537 rc = -ESOCKTNOSUPPORT;
538 if (sock->type != SOCK_SEQPACKET)
539 goto out;
1b8d7ae4 540
b18e7a06 541 rc = -EINVAL;
542 if (protocol)
1da177e4
LT		 543 goto out;
544
d7736958 545 rc = -ENOMEM;
11aa9c28 546 if ((sk = x25_alloc_socket(net, kern)) == NULL)
1da177e4
LT		 547 goto out;
548
549 x25 = x25_sk(sk);
550
551 sock_init_data(sock, sk);
552
553 x25_init_timers(sk);
554
555 sock->ops = &x25_proto_ops;
556 sk->sk_protocol = protocol;
557 sk->sk_backlog_rcv = x25_backlog_rcv;
558
559 x25->t21 = sysctl_x25_call_request_timeout;
560 x25->t22 = sysctl_x25_reset_request_timeout;
561 x25->t23 = sysctl_x25_clear_request_timeout;
562 x25->t2 = sysctl_x25_ack_holdback_timeout;
563 x25->state = X25_STATE_0;
cb65d506 564 x25->cudmatchlength = 0;
37cda787 565 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
ebc3f64b 566 /* on call accept */
1da177e4
LT		 567
568 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
569 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
570 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
571 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
ddd0451f
JH		 572 x25->facilities.throughput = 0; /* by default don't negotiate
573 throughput */
1da177e4 574 x25->facilities.reverse = X25_DEFAULT_REVERSE;
f8e1d201
YH		 575 x25->dte_facilities.calling_len = 0;
576 x25->dte_facilities.called_len = 0;
577 memset(x25->dte_facilities.called_ae, '\0',
578 sizeof(x25->dte_facilities.called_ae));
579 memset(x25->dte_facilities.calling_ae, '\0',
580 sizeof(x25->dte_facilities.calling_ae));
a64b7b93 581
1da177e4
LT		 582 rc = 0;
583out:
584 return rc;
585}
586
587static struct sock *x25_make_new(struct sock *osk)
588{
589 struct sock *sk = NULL;
590 struct x25_sock *x25, *ox25;
591
592 if (osk->sk_type != SOCK_SEQPACKET)
593 goto out;
594
11aa9c28 595 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
1da177e4
LT		 596 goto out;
597
598 x25 = x25_sk(sk);
599
600 sk->sk_type = osk->sk_type;
1da177e4
LT		 601 sk->sk_priority = osk->sk_priority;
602 sk->sk_protocol = osk->sk_protocol;
603 sk->sk_rcvbuf = osk->sk_rcvbuf;
604 sk->sk_sndbuf = osk->sk_sndbuf;
605 sk->sk_state = TCP_ESTABLISHED;
1da177e4 606 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
a20a8554 607 sock_copy_flags(sk, osk);
1da177e4
LT		 608
609 ox25 = x25_sk(osk);
610 x25->t21 = ox25->t21;
611 x25->t22 = ox25->t22;
612 x25->t23 = ox25->t23;
613 x25->t2 = ox25->t2;
cb863ffd 614 x25->flags = ox25->flags;
1da177e4 615 x25->facilities = ox25->facilities;
a64b7b93 616 x25->dte_facilities = ox25->dte_facilities;
cb65d506 617 x25->cudmatchlength = ox25->cudmatchlength;
1da177e4 618
b7792e34 619 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
1da177e4
LT		 620 x25_init_timers(sk);
621out:
622 return sk;
623}
624
625static int x25_release(struct socket *sock)
626{
627 struct sock *sk = sock->sk;
628 struct x25_sock *x25;
629
630 if (!sk)
77b22836 631 return 0;
1da177e4
LT		 632
633 x25 = x25_sk(sk);
634
77b22836
AB		 635 sock_hold(sk);
636 lock_sock(sk);
1da177e4
LT		 637 switch (x25->state) {
638
639 case X25_STATE_0:
640 case X25_STATE_2:
641 x25_disconnect(sk, 0, 0, 0);
77b22836 642 __x25_destroy_socket(sk);
1da177e4
LT		 643 goto out;
644
645 case X25_STATE_1:
646 case X25_STATE_3:
647 case X25_STATE_4:
648 x25_clear_queues(sk);
649 x25_write_internal(sk, X25_CLEAR_REQUEST);
650 x25_start_t23timer(sk);
651 x25->state = X25_STATE_2;
652 sk->sk_state = TCP_CLOSE;
653 sk->sk_shutdown |= SEND_SHUTDOWN;
654 sk->sk_state_change(sk);
655 sock_set_flag(sk, SOCK_DEAD);
656 sock_set_flag(sk, SOCK_DESTROY);
657 break;
f8fc57e8
MS		 658
659 case X25_STATE_5:
660 x25_write_internal(sk, X25_CLEAR_REQUEST);
661 x25_disconnect(sk, 0, 0, 0);
662 __x25_destroy_socket(sk);
663 goto out;
1da177e4
LT		 664 }
665
c751e4f8 666 sock_orphan(sk);
1da177e4 667out:
77b22836
AB		 668 release_sock(sk);
669 sock_put(sk);
1da177e4
LT		 670 return 0;
671}
672
673static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
674{
675 struct sock *sk = sock->sk;
676 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
a9288525 677 int len, i, rc = 0;
1da177e4 678
797a22bd 679 if (addr_len != sizeof(struct sockaddr_x25) ||
6ee50c8e
DC		 680 addr->sx25_family != AF_X25 ||
681 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
91774904
AB		 682 rc = -EINVAL;
683 goto out;
684 }
1da177e4 685
06137619
MS		 686 /* check for the null_x25_address */
687 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
688
689 len = strlen(addr->sx25_addr.x25_addr);
690 for (i = 0; i < len; i++) {
691 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
692 rc = -EINVAL;
693 goto out;
694 }
a9288525 695 }
696 }
697
90c27297 698 lock_sock(sk);
797a22bd
ED		 699 if (sock_flag(sk, SOCK_ZAPPED)) {
700 x25_sk(sk)->source_addr = addr->sx25_addr;
701 x25_insert_socket(sk);
702 sock_reset_flag(sk, SOCK_ZAPPED);
703 } else {
704 rc = -EINVAL;
705 }
90c27297 706 release_sock(sk);
1da177e4 707 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
91774904 708out:
91774904 709 return rc;
1da177e4
LT		 710}
711
712static int x25_wait_for_connection_establishment(struct sock *sk)
713{
714 DECLARE_WAITQUEUE(wait, current);
f8e1d201 715 int rc;
1da177e4 716
aa395145 717 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 718 for (;;) {
719 __set_current_state(TASK_INTERRUPTIBLE);
720 rc = -ERESTARTSYS;
721 if (signal_pending(current))
722 break;
723 rc = sock_error(sk);
724 if (rc) {
725 sk->sk_socket->state = SS_UNCONNECTED;
726 break;
727 }
944e594c
MS		 728 rc = -ENOTCONN;
729 if (sk->sk_state == TCP_CLOSE) {
730 sk->sk_socket->state = SS_UNCONNECTED;
731 break;
732 }
1da177e4
LT		 733 rc = 0;
734 if (sk->sk_state != TCP_ESTABLISHED) {
735 release_sock(sk);
736 schedule();
737 lock_sock(sk);
738 } else
739 break;
740 }
741 __set_current_state(TASK_RUNNING);
aa395145 742 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 743 return rc;
744}
745
746static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
747 int addr_len, int flags)
748{
749 struct sock *sk = sock->sk;
750 struct x25_sock *x25 = x25_sk(sk);
751 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
752 struct x25_route *rt;
753 int rc = 0;
754
755 lock_sock(sk);
756 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
757 sock->state = SS_CONNECTED;
758 goto out; /* Connect completed during a ERESTARTSYS event */
759 }
760
761 rc = -ECONNREFUSED;
762 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
763 sock->state = SS_UNCONNECTED;
764 goto out;
765 }
766
767 rc = -EISCONN; /* No reconnect on a seqpacket socket */
768 if (sk->sk_state == TCP_ESTABLISHED)
769 goto out;
770
e21dba7a
MS		 771 rc = -EALREADY; /* Do nothing if call is already in progress */
772 if (sk->sk_state == TCP_SYN_SENT)
773 goto out;
774
f8e1d201 775 sk->sk_state = TCP_CLOSE;
1da177e4
LT		 776 sock->state = SS_UNCONNECTED;
777
778 rc = -EINVAL;
779 if (addr_len != sizeof(struct sockaddr_x25) ||
6ee50c8e
DC		 780 addr->sx25_family != AF_X25 ||
781 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
1da177e4
LT		 782 goto out;
783
784 rc = -ENETUNREACH;
785 rt = x25_get_route(&addr->sx25_addr);
786 if (!rt)
787 goto out;
788
789 x25->neighbour = x25_get_neigh(rt->dev);
790 if (!x25->neighbour)
791 goto out_put_route;
792
793 x25_limit_facilities(&x25->facilities, x25->neighbour);
794
795 x25->lci = x25_new_lci(x25->neighbour);
796 if (!x25->lci)
797 goto out_put_neigh;
798
799 rc = -EINVAL;
800 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
801 goto out_put_neigh;
802
803 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
804 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
805
806 x25->dest_addr = addr->sx25_addr;
807
808 /* Move to connecting socket, start sending Connect Requests */
809 sock->state = SS_CONNECTING;
810 sk->sk_state = TCP_SYN_SENT;
811
812 x25->state = X25_STATE_1;
813
814 x25_write_internal(sk, X25_CALL_REQUEST);
815
816 x25_start_heartbeat(sk);
817 x25_start_t21timer(sk);
818
819 /* Now the loop */
820 rc = -EINPROGRESS;
821 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
e21dba7a 822 goto out;
1da177e4
LT		 823
824 rc = x25_wait_for_connection_establishment(sk);
825 if (rc)
826 goto out_put_neigh;
827
828 sock->state = SS_CONNECTED;
829 rc = 0;
830out_put_neigh:
36118230 831 if (rc && x25->neighbour) {
95d6ebd5 832 read_lock_bh(&x25_list_lock);
1da177e4 833 x25_neigh_put(x25->neighbour);
95d6ebd5
ED		 834 x25->neighbour = NULL;
835 read_unlock_bh(&x25_list_lock);
ee74d0bd 836 x25->state = X25_STATE_0;
95d6ebd5 837 }
1da177e4
LT		 838out_put_route:
839 x25_route_put(rt);
840out:
841 release_sock(sk);
842 return rc;
843}
844
bac37ec8 845static int x25_wait_for_data(struct sock *sk, long timeout)
1da177e4
LT		 846{
847 DECLARE_WAITQUEUE(wait, current);
848 int rc = 0;
849
aa395145 850 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 851 for (;;) {
852 __set_current_state(TASK_INTERRUPTIBLE);
853 if (sk->sk_shutdown & RCV_SHUTDOWN)
854 break;
855 rc = -ERESTARTSYS;
856 if (signal_pending(current))
857 break;
858 rc = -EAGAIN;
859 if (!timeout)
860 break;
861 rc = 0;
862 if (skb_queue_empty(&sk->sk_receive_queue)) {
863 release_sock(sk);
864 timeout = schedule_timeout(timeout);
865 lock_sock(sk);
866 } else
867 break;
868 }
869 __set_current_state(TASK_RUNNING);
aa395145 870 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 871 return rc;
872}
f8e1d201 873
cdfbabfb
DH		 874static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
875 bool kern)
1da177e4
LT		 876{
877 struct sock *sk = sock->sk;
878 struct sock *newsk;
879 struct sk_buff *skb;
880 int rc = -EINVAL;
881
141646ce 882 if (!sk)
1da177e4
LT		 883 goto out;
884
885 rc = -EOPNOTSUPP;
886 if (sk->sk_type != SOCK_SEQPACKET)
887 goto out;
888
889 lock_sock(sk);
141646ce
AH		 890 rc = -EINVAL;
891 if (sk->sk_state != TCP_LISTEN)
892 goto out2;
893
1da177e4
LT		 894 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
895 if (rc)
896 goto out2;
897 skb = skb_dequeue(&sk->sk_receive_queue);
898 rc = -EINVAL;
899 if (!skb->sk)
900 goto out2;
901 newsk = skb->sk;
b61d38e0 902 sock_graft(newsk, newsock);
1da177e4
LT		 903
904 /* Now attach up the new socket */
905 skb->sk = NULL;
906 kfree_skb(skb);
7976a11b 907 sk_acceptq_removed(sk);
1da177e4
LT		 908 newsock->state = SS_CONNECTED;
909 rc = 0;
910out2:
911 release_sock(sk);
912out:
913 return rc;
914}
915
916static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
9b2c45d4 917 int peer)
1da177e4
LT		 918{
919 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
920 struct sock *sk = sock->sk;
921 struct x25_sock *x25 = x25_sk(sk);
91774904 922 int rc = 0;
1da177e4
LT		 923
924 if (peer) {
91774904
AB		 925 if (sk->sk_state != TCP_ESTABLISHED) {
926 rc = -ENOTCONN;
927 goto out;
928 }
1da177e4
LT		 929 sx25->sx25_addr = x25->dest_addr;
930 } else
931 sx25->sx25_addr = x25->source_addr;
932
933 sx25->sx25_family = AF_X25;
9b2c45d4 934 rc = sizeof(*sx25);
1da177e4 935
91774904 936out:
91774904
AB		 937 return rc;
938}
939
1da177e4
LT		 940int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
941 unsigned int lci)
942{
943 struct sock *sk;
944 struct sock *make;
945 struct x25_sock *makex25;
946 struct x25_address source_addr, dest_addr;
947 struct x25_facilities facilities;
a64b7b93 948 struct x25_dte_facilities dte_facilities;
95a9dc43 949 int len, addr_len, rc;
1da177e4
LT		 950
951 /*
952 * Remove the LCI and frame type.
953 */
954 skb_pull(skb, X25_STD_MIN_LEN);
955
956 /*
957 * Extract the X.25 addresses and convert them to ASCII strings,
958 * and remove them.
f5eb917b
JH		 959 *
960 * Address block is mandatory in call request packets
1da177e4 961 */
f5eb917b
JH		 962 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
963 if (addr_len <= 0)
964 goto out_clear_request;
95a9dc43 965 skb_pull(skb, addr_len);
1da177e4
LT		 966
967 /*
968 * Get the length of the facilities, skip past them for the moment
969 * get the call user data because this is needed to determine
970 * the correct listener
f5eb917b
JH		 971 *
972 * Facilities length is mandatory in call request packets
1da177e4 973 */
cb101ed2 974 if (!pskb_may_pull(skb, 1))
f5eb917b 975 goto out_clear_request;
1da177e4 976 len = skb->data[0] + 1;
cb101ed2 977 if (!pskb_may_pull(skb, len))
f5eb917b 978 goto out_clear_request;
1da177e4
LT		 979 skb_pull(skb,len);
980
c7fd0d48
MD		 981 /*
982 * Ensure that the amount of call user data is valid.
983 */
984 if (skb->len > X25_MAX_CUD_LEN)
985 goto out_clear_request;
986
cb101ed2
MD		 987 /*
988 * Get all the call user data so it can be used in
989 * x25_find_listener and skb_copy_from_linear_data up ahead.
990 */
991 if (!pskb_may_pull(skb, skb->len))
992 goto out_clear_request;
993
1da177e4
LT		 994 /*
995 * Find a listener for the particular address/cud pair.
996 */
cb65d506
SP		 997 sk = x25_find_listener(&source_addr,skb);
998 skb_push(skb,len);
1da177e4 999
95a9dc43
AH		 1000 if (sk != NULL && sk_acceptq_is_full(sk)) {
1001 goto out_sock_put;
1002 }
1003
1da177e4 1004 /*
95a9dc43
AH		 1005 * We dont have any listeners for this incoming call.
1006 * Try forwarding it.
1da177e4 1007 */
95a9dc43
AH		 1008 if (sk == NULL) {
1009 skb_push(skb, addr_len + X25_STD_MIN_LEN);
39e21c0d
AH		 1010 if (sysctl_x25_forward &&
1011 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
95a9dc43
AH		 1012 {
1013 /* Call was forwarded, dont process it any more */
1014 kfree_skb(skb);
1015 rc = 1;
1016 goto out;
1017 } else {
1018 /* No listeners, can't forward, clear the call */
1019 goto out_clear_request;
1020 }
1021 }
1da177e4
LT		 1022
1023 /*
1024 * Try to reach a compromise on the requested facilities.
1025 */
a64b7b93
SP		 1026 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1027 if (len == -1)
1da177e4
LT		 1028 goto out_sock_put;
1029
1030 /*
1031 * current neighbour/link might impose additional limits
8406d38f 1032 * on certain facilities
1da177e4
LT		 1033 */
1034
1035 x25_limit_facilities(&facilities, nb);
1036
1037 /*
1038 * Try to create a new socket.
1039 */
1040 make = x25_make_new(sk);
1041 if (!make)
1042 goto out_sock_put;
1043
1044 /*
1045 * Remove the facilities
1046 */
1047 skb_pull(skb, len);
1048
1049 skb->sk = make;
1050 make->sk_state = TCP_ESTABLISHED;
1051
1052 makex25 = x25_sk(make);
1053 makex25->lci = lci;
1054 makex25->dest_addr = dest_addr;
1055 makex25->source_addr = source_addr;
4ee18c17 1056 x25_neigh_hold(nb);
1da177e4
LT		 1057 makex25->neighbour = nb;
1058 makex25->facilities = facilities;
a64b7b93 1059 makex25->dte_facilities= dte_facilities;
1da177e4 1060 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
cb65d506
SP		 1061 /* ensure no reverse facil on accept */
1062 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
a64b7b93
SP		 1063 /* ensure no calling address extension on accept */
1064 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
cb65d506 1065 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1da177e4 1066
37cda787 1067 /* Normally all calls are accepted immediately */
1068 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
ebc3f64b
SP		 1069 x25_write_internal(make, X25_CALL_ACCEPTED);
1070 makex25->state = X25_STATE_3;
f8fc57e8
MS		 1071 } else {
1072 makex25->state = X25_STATE_5;
ebc3f64b 1073 }
1da177e4 1074
cb65d506
SP		 1075 /*
1076 * Incoming Call User Data.
1077 */
8db09f26
RK		 1078 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1079 makex25->calluserdata.cudlength = skb->len;
cb65d506 1080
7976a11b 1081 sk_acceptq_added(sk);
1da177e4
LT		 1082
1083 x25_insert_socket(make);
1084
1085 skb_queue_head(&sk->sk_receive_queue, skb);
1086
1087 x25_start_heartbeat(make);
1088
1089 if (!sock_flag(sk, SOCK_DEAD))
676d2369 1090 sk->sk_data_ready(sk);
1da177e4
LT		 1091 rc = 1;
1092 sock_put(sk);
1093out:
1094 return rc;
1095out_sock_put:
1096 sock_put(sk);
1097out_clear_request:
1098 rc = 0;
1099 x25_transmit_clear_request(nb, lci, 0x01);
1100 goto out;
1101}
1102
1b784140 1103static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1da177e4
LT		 1104{
1105 struct sock *sk = sock->sk;
1106 struct x25_sock *x25 = x25_sk(sk);
342dfc30 1107 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1da177e4
LT		 1108 struct sockaddr_x25 sx25;
1109 struct sk_buff *skb;
1110 unsigned char *asmptr;
1111 int noblock = msg->msg_flags & MSG_DONTWAIT;
1112 size_t size;
1113 int qbit = 0, rc = -EINVAL;
1114
77b22836 1115 lock_sock(sk);
1da177e4
LT		 1116 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1117 goto out;
1118
1119 /* we currently don't support segmented records at the user interface */
1120 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1121 goto out;
1122
1123 rc = -EADDRNOTAVAIL;
1124 if (sock_flag(sk, SOCK_ZAPPED))
1125 goto out;
1126
1127 rc = -EPIPE;
1128 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1129 send_sig(SIGPIPE, current, 0);
1130 goto out;
1131 }
1132
1133 rc = -ENETUNREACH;
1134 if (!x25->neighbour)
1135 goto out;
1136
1137 if (usx25) {
1138 rc = -EINVAL;
1139 if (msg->msg_namelen < sizeof(sx25))
1140 goto out;
1141 memcpy(&sx25, usx25, sizeof(sx25));
1142 rc = -EISCONN;
1143 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1144 goto out;
1145 rc = -EINVAL;
1146 if (sx25.sx25_family != AF_X25)
1147 goto out;
1148 } else {
1149 /*
1150 * FIXME 1003.1g - if the socket is like this because
1151 * it has become closed (not started closed) we ought
1152 * to SIGPIPE, EPIPE;
1153 */
1154 rc = -ENOTCONN;
1155 if (sk->sk_state != TCP_ESTABLISHED)
1156 goto out;
1157
1158 sx25.sx25_family = AF_X25;
1159 sx25.sx25_addr = x25->dest_addr;
1160 }
1161
83e0bbcb
AC		 1162 /* Sanity check the packet size */
1163 if (len > 65535) {
1164 rc = -EMSGSIZE;
1165 goto out;
1166 }
1167
1da177e4
LT		 1168 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1169
1170 /* Build a packet */
1171 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1172
1173 if ((msg->msg_flags & MSG_OOB) && len > 32)
1174 len = 32;
1175
1176 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1177
77b22836 1178 release_sock(sk);
1da177e4 1179 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
77b22836 1180 lock_sock(sk);
1da177e4
LT		 1181 if (!skb)
1182 goto out;
1183 X25_SKB_CB(skb)->flags = msg->msg_flags;
1184
1185 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1186
1187 /*
1188 * Put the data on the end
1189 */
1190 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1191
eeeb0374
ACM		 1192 skb_reset_transport_header(skb);
1193 skb_put(skb, len);
1da177e4 1194
6ce8e9ce 1195 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1da177e4
LT		 1196 if (rc)
1197 goto out_kfree_skb;
1198
1199 /*
1200 * If the Q BIT Include socket option is in force, the first
1201 * byte of the user data is the logical value of the Q Bit.
1202 */
cb863ffd 1203 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
cb101ed2
MD		 1204 if (!pskb_may_pull(skb, 1))
1205 goto out_kfree_skb;
1206
1da177e4
LT		 1207 qbit = skb->data[0];
1208 skb_pull(skb, 1);
1209 }
1210
1211 /*
1212 * Push down the X.25 header
1213 */
1214 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1215
1216 if (msg->msg_flags & MSG_OOB) {
1217 if (x25->neighbour->extended) {
1218 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1219 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1220 *asmptr++ = (x25->lci >> 0) & 0xFF;
1221 *asmptr++ = X25_INTERRUPT;
1222 } else {
1223 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1224 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1225 *asmptr++ = (x25->lci >> 0) & 0xFF;
1226 *asmptr++ = X25_INTERRUPT;
1227 }
1228 } else {
1229 if (x25->neighbour->extended) {
1230 /* Build an Extended X.25 header */
1231 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1232 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1233 *asmptr++ = (x25->lci >> 0) & 0xFF;
1234 *asmptr++ = X25_DATA;
1235 *asmptr++ = X25_DATA;
1236 } else {
1237 /* Build an Standard X.25 header */
1238 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1239 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1240 *asmptr++ = (x25->lci >> 0) & 0xFF;
1241 *asmptr++ = X25_DATA;
1242 }
1243
1244 if (qbit)
1245 skb->data[0] |= X25_Q_BIT;
1246 }
1247
1248 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1249 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1250
1251 rc = -ENOTCONN;
1252 if (sk->sk_state != TCP_ESTABLISHED)
1253 goto out_kfree_skb;
1254
1255 if (msg->msg_flags & MSG_OOB)
1256 skb_queue_tail(&x25->interrupt_out_queue, skb);
1257 else {
8db09f26
RK		 1258 rc = x25_output(sk, skb);
1259 len = rc;
1260 if (rc < 0)
1da177e4 1261 kfree_skb(skb);
cb863ffd 1262 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1da177e4
LT		 1263 len++;
1264 }
1265
1da177e4 1266 x25_kick(sk);
1da177e4
LT		 1267 rc = len;
1268out:
77b22836 1269 release_sock(sk);
1da177e4
LT		 1270 return rc;
1271out_kfree_skb:
1272 kfree_skb(skb);
1273 goto out;
1274}
1275
1276
1b784140 1277static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1da177e4
LT		 1278 int flags)
1279{
1280 struct sock *sk = sock->sk;
1281 struct x25_sock *x25 = x25_sk(sk);
342dfc30 1282 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1da177e4 1283 size_t copied;
501e89d3 1284 int qbit, header_len;
1da177e4
LT		 1285 struct sk_buff *skb;
1286 unsigned char *asmptr;
1287 int rc = -ENOTCONN;
1288
77b22836 1289 lock_sock(sk);
501e89d3
DJ		 1290
1291 if (x25->neighbour == NULL)
1292 goto out;
1293
1294 header_len = x25->neighbour->extended ?
1295 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1296
1da177e4
LT		 1297 /*
1298 * This works for seqpacket too. The receiver has ordered the queue for
1299 * us! We do one quick check first though
1300 */
1301 if (sk->sk_state != TCP_ESTABLISHED)
1302 goto out;
1303
1304 if (flags & MSG_OOB) {
1305 rc = -EINVAL;
1306 if (sock_flag(sk, SOCK_URGINLINE) ||
1307 !skb_peek(&x25->interrupt_in_queue))
1308 goto out;
1309
1310 skb = skb_dequeue(&x25->interrupt_in_queue);
1311
cb101ed2
MD		 1312 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1313 goto out_free_dgram;
1314
1da177e4
LT		 1315 skb_pull(skb, X25_STD_MIN_LEN);
1316
1317 /*
1318 * No Q bit information on Interrupt data.
1319 */
cb863ffd 1320 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1321 asmptr = skb_push(skb, 1);
1322 *asmptr = 0x00;
1323 }
1324
1325 msg->msg_flags |= MSG_OOB;
1326 } else {
1327 /* Now we can treat all alike */
77b22836 1328 release_sock(sk);
f4b41f06 1329 skb = skb_recv_datagram(sk, flags, &rc);
77b22836 1330 lock_sock(sk);
1da177e4
LT		 1331 if (!skb)
1332 goto out;
1333
cb101ed2
MD		 1334 if (!pskb_may_pull(skb, header_len))
1335 goto out_free_dgram;
1336
1da177e4
LT		 1337 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1338
cb101ed2 1339 skb_pull(skb, header_len);
1da177e4 1340
cb863ffd 1341 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1342 asmptr = skb_push(skb, 1);
1343 *asmptr = qbit;
1344 }
1345 }
1346
badff6d0 1347 skb_reset_transport_header(skb);
1da177e4
LT		 1348 copied = skb->len;
1349
1350 if (copied > size) {
1351 copied = size;
1352 msg->msg_flags |= MSG_TRUNC;
1353 }
1354
f8e1d201 1355 /* Currently, each datagram always contains a complete record */
1da177e4
LT		 1356 msg->msg_flags |= MSG_EOR;
1357
51f3d02b 1358 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1da177e4
LT		 1359 if (rc)
1360 goto out_free_dgram;
1361
1362 if (sx25) {
1363 sx25->sx25_family = AF_X25;
1364 sx25->sx25_addr = x25->dest_addr;
f3d33426 1365 msg->msg_namelen = sizeof(*sx25);
1da177e4
LT		 1366 }
1367
1da177e4 1368 x25_check_rbuf(sk);
1da177e4
LT		 1369 rc = copied;
1370out_free_dgram:
1371 skb_free_datagram(sk, skb);
1372out:
77b22836 1373 release_sock(sk);
1da177e4
LT		 1374 return rc;
1375}
1376
1377
1378static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1379{
1380 struct sock *sk = sock->sk;
1381 struct x25_sock *x25 = x25_sk(sk);
1382 void __user *argp = (void __user *)arg;
1383 int rc;
1384
1385 switch (cmd) {
fddc5f3e
JP		 1386 case TIOCOUTQ: {
1387 int amount;
1388
1389 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1390 if (amount < 0)
1391 amount = 0;
1392 rc = put_user(amount, (unsigned int __user *)argp);
1393 break;
1394 }
1da177e4 1395
fddc5f3e
JP		 1396 case TIOCINQ: {
1397 struct sk_buff *skb;
1398 int amount = 0;
1399 /*
1400 * These two are safe on a single CPU system as
1401 * only user tasks fiddle here
1402 */
1403 lock_sock(sk);
1404 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1405 amount = skb->len;
1406 release_sock(sk);
1407 rc = put_user(amount, (unsigned int __user *)argp);
1408 break;
1409 }
1da177e4 1410
fddc5f3e
JP		 1411 case SIOCGIFADDR:
1412 case SIOCSIFADDR:
1413 case SIOCGIFDSTADDR:
1414 case SIOCSIFDSTADDR:
1415 case SIOCGIFBRDADDR:
1416 case SIOCSIFBRDADDR:
1417 case SIOCGIFNETMASK:
1418 case SIOCSIFNETMASK:
1419 case SIOCGIFMETRIC:
1420 case SIOCSIFMETRIC:
1421 rc = -EINVAL;
1422 break;
1423 case SIOCADDRT:
1424 case SIOCDELRT:
1425 rc = -EPERM;
1426 if (!capable(CAP_NET_ADMIN))
1da177e4 1427 break;
fddc5f3e
JP		 1428 rc = x25_route_ioctl(cmd, argp);
1429 break;
1430 case SIOCX25GSUBSCRIP:
1431 rc = x25_subscr_ioctl(cmd, argp);
1432 break;
1433 case SIOCX25SSUBSCRIP:
1434 rc = -EPERM;
1435 if (!capable(CAP_NET_ADMIN))
1da177e4 1436 break;
fddc5f3e
JP		 1437 rc = x25_subscr_ioctl(cmd, argp);
1438 break;
1439 case SIOCX25GFACILITIES: {
1440 lock_sock(sk);
1441 rc = copy_to_user(argp, &x25->facilities,
1442 sizeof(x25->facilities))
1443 ? -EFAULT : 0;
1444 release_sock(sk);
1445 break;
1446 }
1da177e4 1447
fddc5f3e
JP		 1448 case SIOCX25SFACILITIES: {
1449 struct x25_facilities facilities;
1450 rc = -EFAULT;
1451 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1452 break;
1453 rc = -EINVAL;
1454 lock_sock(sk);
1455 if (sk->sk_state != TCP_LISTEN &&
1456 sk->sk_state != TCP_CLOSE)
1457 goto out_fac_release;
1458 if (facilities.pacsize_in < X25_PS16 ||
1459 facilities.pacsize_in > X25_PS4096)
1460 goto out_fac_release;
1461 if (facilities.pacsize_out < X25_PS16 ||
1462 facilities.pacsize_out > X25_PS4096)
1463 goto out_fac_release;
1464 if (facilities.winsize_in < 1 ||
1465 facilities.winsize_in > 127)
1466 goto out_fac_release;
1467 if (facilities.throughput) {
1468 int out = facilities.throughput & 0xf0;
1469 int in = facilities.throughput & 0x0f;
1470 if (!out)
1471 facilities.throughput |=
1472 X25_DEFAULT_THROUGHPUT << 4;
1473 else if (out < 0x30 || out > 0xD0)
f90de660 1474 goto out_fac_release;
fddc5f3e
JP		 1475 if (!in)
1476 facilities.throughput |=
1477 X25_DEFAULT_THROUGHPUT;
1478 else if (in < 0x03 || in > 0x0D)
f90de660 1479 goto out_fac_release;
f8e1d201 1480 }
fddc5f3e
JP		 1481 if (facilities.reverse &&
1482 (facilities.reverse & 0x81) != 0x81)
1483 goto out_fac_release;
1484 x25->facilities = facilities;
1485 rc = 0;
1486out_fac_release:
1487 release_sock(sk);
1488 break;
1489 }
a64b7b93 1490
fddc5f3e
JP		 1491 case SIOCX25GDTEFACILITIES: {
1492 lock_sock(sk);
1493 rc = copy_to_user(argp, &x25->dte_facilities,
1494 sizeof(x25->dte_facilities));
1495 release_sock(sk);
1496 if (rc)
f8e1d201 1497 rc = -EFAULT;
fddc5f3e
JP		 1498 break;
1499 }
a64b7b93 1500
fddc5f3e
JP		 1501 case SIOCX25SDTEFACILITIES: {
1502 struct x25_dte_facilities dtefacs;
1503 rc = -EFAULT;
1504 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1da177e4 1505 break;
fddc5f3e
JP		 1506 rc = -EINVAL;
1507 lock_sock(sk);
1508 if (sk->sk_state != TCP_LISTEN &&
1509 sk->sk_state != TCP_CLOSE)
1510 goto out_dtefac_release;
1511 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1512 goto out_dtefac_release;
fddc5f3e 1513 if (dtefacs.called_len > X25_MAX_AE_LEN)
fddc5f3e
JP		 1514 goto out_dtefac_release;
1515 x25->dte_facilities = dtefacs;
1516 rc = 0;
1517out_dtefac_release:
1518 release_sock(sk);
1519 break;
1520 }
1da177e4 1521
fddc5f3e
JP		 1522 case SIOCX25GCALLUSERDATA: {
1523 lock_sock(sk);
1524 rc = copy_to_user(argp, &x25->calluserdata,
1525 sizeof(x25->calluserdata))
1526 ? -EFAULT : 0;
1527 release_sock(sk);
1528 break;
1529 }
1da177e4 1530
fddc5f3e
JP		 1531 case SIOCX25SCALLUSERDATA: {
1532 struct x25_calluserdata calluserdata;
1da177e4 1533
fddc5f3e
JP		 1534 rc = -EFAULT;
1535 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1da177e4 1536 break;
fddc5f3e
JP		 1537 rc = -EINVAL;
1538 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1539 break;
1540 lock_sock(sk);
1541 x25->calluserdata = calluserdata;
1542 release_sock(sk);
1543 rc = 0;
1544 break;
1545 }
1da177e4 1546
fddc5f3e
JP		 1547 case SIOCX25GCAUSEDIAG: {
1548 lock_sock(sk);
1549 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1550 ? -EFAULT : 0;
1551 release_sock(sk);
1552 break;
1553 }
1554
1555 case SIOCX25SCAUSEDIAG: {
1556 struct x25_causediag causediag;
1557 rc = -EFAULT;
1558 if (copy_from_user(&causediag, argp, sizeof(causediag)))
386e50cc 1559 break;
fddc5f3e
JP		 1560 lock_sock(sk);
1561 x25->causediag = causediag;
1562 release_sock(sk);
1563 rc = 0;
1564 break;
386e50cc 1565
fddc5f3e 1566 }
386e50cc 1567
fddc5f3e
JP		 1568 case SIOCX25SCUDMATCHLEN: {
1569 struct x25_subaddr sub_addr;
1570 rc = -EINVAL;
1571 lock_sock(sk);
1572 if(sk->sk_state != TCP_CLOSE)
1573 goto out_cud_release;
1574 rc = -EFAULT;
1575 if (copy_from_user(&sub_addr, argp,
1576 sizeof(sub_addr)))
1577 goto out_cud_release;
1578 rc = -EINVAL;
1579 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1580 goto out_cud_release;
1581 x25->cudmatchlength = sub_addr.cudmatchlength;
1582 rc = 0;
3f0a069a 1583out_cud_release:
fddc5f3e
JP		 1584 release_sock(sk);
1585 break;
1586 }
cb65d506 1587
fddc5f3e
JP		 1588 case SIOCX25CALLACCPTAPPRV: {
1589 rc = -EINVAL;
1590 lock_sock(sk);
4ccb93ce
DJ		 1591 if (sk->sk_state == TCP_CLOSE) {
1592 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1593 rc = 0;
1594 }
fddc5f3e 1595 release_sock(sk);
fddc5f3e
JP		 1596 break;
1597 }
ebc3f64b 1598
fddc5f3e
JP		 1599 case SIOCX25SENDCALLACCPT: {
1600 rc = -EINVAL;
1601 lock_sock(sk);
1602 if (sk->sk_state != TCP_ESTABLISHED)
4ccb93ce 1603 goto out_sendcallaccpt_release;
fddc5f3e
JP		 1604 /* must call accptapprv above */
1605 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
4ccb93ce 1606 goto out_sendcallaccpt_release;
fddc5f3e
JP		 1607 x25_write_internal(sk, X25_CALL_ACCEPTED);
1608 x25->state = X25_STATE_3;
fddc5f3e 1609 rc = 0;
4ccb93ce
DJ		 1610out_sendcallaccpt_release:
1611 release_sock(sk);
fddc5f3e
JP		 1612 break;
1613 }
1614
1615 default:
1616 rc = -ENOIOCTLCMD;
1617 break;
1da177e4
LT		 1618 }
1619
1620 return rc;
1621}
1622
ec1b4cf7 1623static const struct net_proto_family x25_family_ops = {
1da177e4
LT		 1624 .family = AF_X25,
1625 .create = x25_create,
1626 .owner = THIS_MODULE,
1627};
1628
1b06e6ba
SP		 1629#ifdef CONFIG_COMPAT
1630static int compat_x25_subscr_ioctl(unsigned int cmd,
1631 struct compat_x25_subscrip_struct __user *x25_subscr32)
1632{
1633 struct compat_x25_subscrip_struct x25_subscr;
1634 struct x25_neigh *nb;
1635 struct net_device *dev;
1636 int rc = -EINVAL;
1637
1638 rc = -EFAULT;
1639 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1640 goto out;
1641
1642 rc = -EINVAL;
1643 dev = x25_dev_get(x25_subscr.device);
1644 if (dev == NULL)
1645 goto out;
1646
1647 nb = x25_get_neigh(dev);
1648 if (nb == NULL)
1649 goto out_dev_put;
1650
1651 dev_put(dev);
1652
1653 if (cmd == SIOCX25GSUBSCRIP) {
5595a1a5 1654 read_lock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1655 x25_subscr.extended = nb->extended;
1656 x25_subscr.global_facil_mask = nb->global_facil_mask;
5595a1a5 1657 read_unlock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1658 rc = copy_to_user(x25_subscr32, &x25_subscr,
1659 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1660 } else {
1661 rc = -EINVAL;
1662 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1663 rc = 0;
5595a1a5 1664 write_lock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1665 nb->extended = x25_subscr.extended;
1666 nb->global_facil_mask = x25_subscr.global_facil_mask;
5595a1a5 1667 write_unlock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1668 }
1669 }
1670 x25_neigh_put(nb);
1671out:
1672 return rc;
1673out_dev_put:
1674 dev_put(dev);
1675 goto out;
1676}
1677
1678static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1679 unsigned long arg)
1680{
1681 void __user *argp = compat_ptr(arg);
1b06e6ba
SP		 1682 int rc = -ENOIOCTLCMD;
1683
1684 switch(cmd) {
1685 case TIOCOUTQ:
1686 case TIOCINQ:
1687 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1688 break;
1b06e6ba
SP		 1689 case SIOCGIFADDR:
1690 case SIOCSIFADDR:
1691 case SIOCGIFDSTADDR:
1692 case SIOCSIFDSTADDR:
1693 case SIOCGIFBRDADDR:
1694 case SIOCSIFBRDADDR:
1695 case SIOCGIFNETMASK:
1696 case SIOCSIFNETMASK:
1697 case SIOCGIFMETRIC:
1698 case SIOCSIFMETRIC:
1699 rc = -EINVAL;
1700 break;
1701 case SIOCADDRT:
1702 case SIOCDELRT:
1703 rc = -EPERM;
1704 if (!capable(CAP_NET_ADMIN))
1705 break;
1706 rc = x25_route_ioctl(cmd, argp);
1707 break;
1708 case SIOCX25GSUBSCRIP:
1709 rc = compat_x25_subscr_ioctl(cmd, argp);
1710 break;
1711 case SIOCX25SSUBSCRIP:
1712 rc = -EPERM;
1713 if (!capable(CAP_NET_ADMIN))
1714 break;
1715 rc = compat_x25_subscr_ioctl(cmd, argp);
1716 break;
1717 case SIOCX25GFACILITIES:
1718 case SIOCX25SFACILITIES:
9a6b9f2e
SP		 1719 case SIOCX25GDTEFACILITIES:
1720 case SIOCX25SDTEFACILITIES:
1b06e6ba
SP		 1721 case SIOCX25GCALLUSERDATA:
1722 case SIOCX25SCALLUSERDATA:
1723 case SIOCX25GCAUSEDIAG:
386e50cc 1724 case SIOCX25SCAUSEDIAG:
1b06e6ba
SP		 1725 case SIOCX25SCUDMATCHLEN:
1726 case SIOCX25CALLACCPTAPPRV:
1727 case SIOCX25SENDCALLACCPT:
1728 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1729 break;
1730 default:
1731 rc = -ENOIOCTLCMD;
1732 break;
1733 }
1734 return rc;
1735}
1736#endif
1737
91774904 1738static const struct proto_ops x25_proto_ops = {
1da177e4
LT		 1739 .family = AF_X25,
1740 .owner = THIS_MODULE,
1741 .release = x25_release,
1742 .bind = x25_bind,
1743 .connect = x25_connect,
1744 .socketpair = sock_no_socketpair,
1745 .accept = x25_accept,
1746 .getname = x25_getname,
a11e1d43 1747 .poll = datagram_poll,
1da177e4 1748 .ioctl = x25_ioctl,
1b06e6ba
SP		 1749#ifdef CONFIG_COMPAT
1750 .compat_ioctl = compat_x25_ioctl,
1751#endif
c7cbdbf2 1752 .gettstamp = sock_gettstamp,
1da177e4
LT		 1753 .listen = x25_listen,
1754 .shutdown = sock_no_shutdown,
1755 .setsockopt = x25_setsockopt,
1756 .getsockopt = x25_getsockopt,
1757 .sendmsg = x25_sendmsg,
1758 .recvmsg = x25_recvmsg,
1759 .mmap = sock_no_mmap,
1760 .sendpage = sock_no_sendpage,
1761};
1762
7546dd97 1763static struct packet_type x25_packet_type __read_mostly = {
09640e63 1764 .type = cpu_to_be16(ETH_P_X25),
1da177e4
LT		 1765 .func = x25_lapb_receive_frame,
1766};
1767
1768static struct notifier_block x25_dev_notifier = {
1769 .notifier_call = x25_device_event,
1770};
1771
1772void x25_kill_by_neigh(struct x25_neigh *nb)
1773{
1774 struct sock *s;
1da177e4
LT		 1775
1776 write_lock_bh(&x25_list_lock);
1777
77816079
DZ		 1778 sk_for_each(s, &x25_list) {
1779 if (x25_sk(s)->neighbour == nb) {
1780 write_unlock_bh(&x25_list_lock);
1781 lock_sock(s);
1da177e4 1782 x25_disconnect(s, ENETUNREACH, 0, 0);
77816079
DZ		 1783 release_sock(s);
1784 write_lock_bh(&x25_list_lock);
1785 }
1786 }
1da177e4 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);
Linux 6.x block layer and io_uring tree(s)