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X25: Move interrupt flag to bitfield
[net-next-2.6.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
1da177e4 38#include <linux/module.h>
4fc268d2 39#include <linux/capability.h>
1da177e4
LT		 40#include <linux/errno.h>
41#include <linux/kernel.h>
42#include <linux/sched.h>
405f5571 43#include <linux/smp_lock.h>
1da177e4
LT		 44#include <linux/timer.h>
45#include <linux/string.h>
46#include <linux/net.h>
47#include <linux/netdevice.h>
48#include <linux/if_arp.h>
49#include <linux/skbuff.h>
5a0e3ad6 50#include <linux/slab.h>
1da177e4 51#include <net/sock.h>
c752f073 52#include <net/tcp_states.h>
1da177e4
LT		 53#include <asm/uaccess.h>
54#include <linux/fcntl.h>
55#include <linux/termios.h> /* For TIOCINQ/OUTQ */
56#include <linux/notifier.h>
57#include <linux/init.h>
1b06e6ba 58#include <linux/compat.h>
a9288525 59#include <linux/ctype.h>
1b06e6ba 60
1da177e4 61#include <net/x25.h>
1b06e6ba 62#include <net/compat.h>
1da177e4
LT		 63
64int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
65int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
66int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
67int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
68int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
39e21c0d 69int sysctl_x25_forward = 0;
1da177e4
LT		 70
71HLIST_HEAD(x25_list);
72DEFINE_RWLOCK(x25_list_lock);
73
90ddc4f0 74static const struct proto_ops x25_proto_ops;
1da177e4
LT		 75
76static struct x25_address null_x25_address = {" "};
77
1b06e6ba
SP		 78#ifdef CONFIG_COMPAT
79struct compat_x25_subscrip_struct {
80 char device[200-sizeof(compat_ulong_t)];
81 compat_ulong_t global_facil_mask;
82 compat_uint_t extended;
83};
84#endif
85
f5eb917b
JH		 86
87int x25_parse_address_block(struct sk_buff *skb,
88 struct x25_address *called_addr,
89 struct x25_address *calling_addr)
90{
91 unsigned char len;
92 int needed;
93 int rc;
94
95 if (skb->len < 1) {
96 /* packet has no address block */
97 rc = 0;
98 goto empty;
99 }
100
101 len = *skb->data;
102 needed = 1 + (len >> 4) + (len & 0x0f);
103
104 if (skb->len < needed) {
105 /* packet is too short to hold the addresses it claims
106 to hold */
107 rc = -1;
108 goto empty;
109 }
110
111 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
112
113empty:
114 *called_addr->x25_addr = 0;
115 *calling_addr->x25_addr = 0;
116
117 return rc;
118}
119
120
1da177e4
LT		 121int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
122 struct x25_address *calling_addr)
123{
6bf1574e 124 unsigned int called_len, calling_len;
1da177e4 125 char *called, *calling;
6bf1574e 126 unsigned int i;
1da177e4
LT		 127
128 called_len = (*p >> 0) & 0x0F;
129 calling_len = (*p >> 4) & 0x0F;
130
131 called = called_addr->x25_addr;
132 calling = calling_addr->x25_addr;
133 p++;
134
135 for (i = 0; i < (called_len + calling_len); i++) {
136 if (i < called_len) {
137 if (i % 2 != 0) {
138 *called++ = ((*p >> 0) & 0x0F) + '0';
139 p++;
140 } else {
141 *called++ = ((*p >> 4) & 0x0F) + '0';
142 }
143 } else {
144 if (i % 2 != 0) {
145 *calling++ = ((*p >> 0) & 0x0F) + '0';
146 p++;
147 } else {
148 *calling++ = ((*p >> 4) & 0x0F) + '0';
149 }
150 }
151 }
152
153 *called = *calling = '\0';
154
155 return 1 + (called_len + calling_len + 1) / 2;
156}
157
158int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
159 struct x25_address *calling_addr)
160{
161 unsigned int called_len, calling_len;
162 char *called, *calling;
163 int i;
164
165 called = called_addr->x25_addr;
166 calling = calling_addr->x25_addr;
167
168 called_len = strlen(called);
169 calling_len = strlen(calling);
170
171 *p++ = (calling_len << 4) | (called_len << 0);
172
173 for (i = 0; i < (called_len + calling_len); i++) {
174 if (i < called_len) {
175 if (i % 2 != 0) {
176 *p |= (*called++ - '0') << 0;
177 p++;
178 } else {
179 *p = 0x00;
180 *p |= (*called++ - '0') << 4;
181 }
182 } else {
183 if (i % 2 != 0) {
184 *p |= (*calling++ - '0') << 0;
185 p++;
186 } else {
187 *p = 0x00;
188 *p |= (*calling++ - '0') << 4;
189 }
190 }
191 }
192
193 return 1 + (called_len + calling_len + 1) / 2;
194}
195
196/*
197 * Socket removal during an interrupt is now safe.
198 */
199static void x25_remove_socket(struct sock *sk)
200{
201 write_lock_bh(&x25_list_lock);
202 sk_del_node_init(sk);
203 write_unlock_bh(&x25_list_lock);
204}
205
206/*
207 * Kill all bound sockets on a dropped device.
208 */
209static void x25_kill_by_device(struct net_device *dev)
210{
211 struct sock *s;
212 struct hlist_node *node;
213
214 write_lock_bh(&x25_list_lock);
215
216 sk_for_each(s, node, &x25_list)
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{
229 struct net_device *dev = ptr;
230 struct x25_neigh *nb;
231
721499e8 232 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB		 233 return NOTIFY_DONE;
234
1da177e4
LT		 235 if (dev->type == ARPHRD_X25
236#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
237 || dev->type == ARPHRD_ETHER
238#endif
239 ) {
240 switch (event) {
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;
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;
284 struct hlist_node *node;
285
286 read_lock_bh(&x25_list_lock);
287 next_best = NULL;
288
289 sk_for_each(s, node, &x25_list)
290 if ((!strcmp(addr->x25_addr,
cb65d506
SP		 291 x25_sk(s)->source_addr.x25_addr) ||
292 !strcmp(addr->x25_addr,
293 null_x25_address.x25_addr)) &&
294 s->sk_state == TCP_LISTEN) {
1da177e4
LT		 295 /*
296 * Found a listening socket, now check the incoming
297 * call user data vs this sockets call user data
298 */
cb65d506 299 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
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;
326 struct hlist_node *node;
327
328 sk_for_each(s, node, &x25_list)
329 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
330 sock_hold(s);
331 goto found;
332 }
333 s = NULL;
334found:
335 return s;
336}
337
338struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
339{
340 struct sock *s;
341
342 read_lock_bh(&x25_list_lock);
343 s = __x25_find_socket(lci, nb);
344 read_unlock_bh(&x25_list_lock);
345 return s;
346}
347
348/*
349 * Find a unique LCI for a given device.
350 */
351static unsigned int x25_new_lci(struct x25_neigh *nb)
352{
353 unsigned int lci = 1;
354 struct sock *sk;
355
356 read_lock_bh(&x25_list_lock);
357
358 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
359 sock_put(sk);
360 if (++lci == 4096) {
361 lci = 0;
362 break;
363 }
364 }
365
366 read_unlock_bh(&x25_list_lock);
367 return lci;
368}
369
370/*
371 * Deferred destroy.
372 */
14ebaf81 373static void __x25_destroy_socket(struct sock *);
1da177e4
LT		 374
375/*
376 * handler for deferred kills.
377 */
378static void x25_destroy_timer(unsigned long data)
379{
14ebaf81 380 x25_destroy_socket_from_timer((struct sock *)data);
1da177e4
LT		 381}
382
383/*
384 * This is called from user mode and the timers. Thus it protects itself
385 * against interrupt users but doesn't worry about being called during
386 * work. Once it is removed from the queue no interrupt or bottom half
387 * will touch it and we are (fairly 8-) ) safe.
388 * Not static as it's used by the timer
389 */
14ebaf81 390static void __x25_destroy_socket(struct sock *sk)
1da177e4
LT		 391{
392 struct sk_buff *skb;
393
1da177e4
LT		 394 x25_stop_heartbeat(sk);
395 x25_stop_timer(sk);
396
397 x25_remove_socket(sk);
398 x25_clear_queues(sk); /* Flush the queues */
399
400 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
401 if (skb->sk != sk) { /* A pending connection */
402 /*
403 * Queue the unaccepted socket for death
404 */
2cec6b01 405 skb->sk->sk_state = TCP_LISTEN;
1da177e4
LT		 406 sock_set_flag(skb->sk, SOCK_DEAD);
407 x25_start_heartbeat(skb->sk);
408 x25_sk(skb->sk)->state = X25_STATE_0;
409 }
410
411 kfree_skb(skb);
412 }
413
c564039f 414 if (sk_has_allocations(sk)) {
1da177e4
LT		 415 /* Defer: outstanding buffers */
416 sk->sk_timer.expires = jiffies + 10 * HZ;
417 sk->sk_timer.function = x25_destroy_timer;
418 sk->sk_timer.data = (unsigned long)sk;
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
435static void x25_destroy_socket(struct sock *sk)
436{
437 sock_hold(sk);
438 lock_sock(sk);
439 __x25_destroy_socket(sk);
1da177e4
LT		 440 release_sock(sk);
441 sock_put(sk);
442}
443
444/*
445 * Handling for system calls applied via the various interfaces to a
446 * X.25 socket object.
447 */
448
449static int x25_setsockopt(struct socket *sock, int level, int optname,
b7058842 450 char __user *optval, unsigned int optlen)
1da177e4
LT		 451{
452 int opt;
453 struct sock *sk = sock->sk;
454 int rc = -ENOPROTOOPT;
455
91774904 456 lock_kernel();
1da177e4
LT		 457 if (level != SOL_X25 || optname != X25_QBITINCL)
458 goto out;
459
460 rc = -EINVAL;
461 if (optlen < sizeof(int))
462 goto out;
463
464 rc = -EFAULT;
465 if (get_user(opt, (int __user *)optval))
466 goto out;
467
cb863ffd 468 if (opt)
469 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
470 else
471 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 472 rc = 0;
473out:
91774904 474 unlock_kernel();
1da177e4
LT		 475 return rc;
476}
477
478static int x25_getsockopt(struct socket *sock, int level, int optname,
479 char __user *optval, int __user *optlen)
480{
481 struct sock *sk = sock->sk;
482 int val, len, rc = -ENOPROTOOPT;
f8e1d201 483
91774904 484 lock_kernel();
1da177e4
LT		 485 if (level != SOL_X25 || optname != X25_QBITINCL)
486 goto out;
487
488 rc = -EFAULT;
489 if (get_user(len, optlen))
490 goto out;
491
492 len = min_t(unsigned int, len, sizeof(int));
493
494 rc = -EINVAL;
495 if (len < 0)
496 goto out;
f8e1d201 497
1da177e4
LT		 498 rc = -EFAULT;
499 if (put_user(len, optlen))
500 goto out;
501
cb863ffd 502 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 503 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
504out:
91774904 505 unlock_kernel();
1da177e4
LT		 506 return rc;
507}
508
509static int x25_listen(struct socket *sock, int backlog)
510{
511 struct sock *sk = sock->sk;
512 int rc = -EOPNOTSUPP;
513
91774904 514 lock_kernel();
1da177e4
LT		 515 if (sk->sk_state != TCP_LISTEN) {
516 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
517 sk->sk_max_ack_backlog = backlog;
518 sk->sk_state = TCP_LISTEN;
519 rc = 0;
520 }
91774904 521 unlock_kernel();
1da177e4
LT		 522
523 return rc;
524}
525
526static struct proto x25_proto = {
527 .name = "X25",
528 .owner = THIS_MODULE,
529 .obj_size = sizeof(struct x25_sock),
530};
531
1b8d7ae4 532static struct sock *x25_alloc_socket(struct net *net)
1da177e4
LT		 533{
534 struct x25_sock *x25;
6257ff21 535 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
1da177e4
LT		 536
537 if (!sk)
538 goto out;
539
540 sock_init_data(NULL, sk);
541
542 x25 = x25_sk(sk);
543 skb_queue_head_init(&x25->ack_queue);
544 skb_queue_head_init(&x25->fragment_queue);
545 skb_queue_head_init(&x25->interrupt_in_queue);
546 skb_queue_head_init(&x25->interrupt_out_queue);
547out:
548 return sk;
549}
550
3f378b68
EP		 551static int x25_create(struct net *net, struct socket *sock, int protocol,
552 int kern)
1da177e4
LT		 553{
554 struct sock *sk;
555 struct x25_sock *x25;
b18e7a06 556 int rc = -EAFNOSUPPORT;
1da177e4 557
09ad9bc7 558 if (!net_eq(net, &init_net))
b18e7a06 559 goto out;
560
561 rc = -ESOCKTNOSUPPORT;
562 if (sock->type != SOCK_SEQPACKET)
563 goto out;
1b8d7ae4 564
b18e7a06 565 rc = -EINVAL;
566 if (protocol)
1da177e4
LT		 567 goto out;
568
b18e7a06 569 rc = -ENOBUFS;
1b8d7ae4 570 if ((sk = x25_alloc_socket(net)) == NULL)
1da177e4
LT		 571 goto out;
572
573 x25 = x25_sk(sk);
574
575 sock_init_data(sock, sk);
576
577 x25_init_timers(sk);
578
579 sock->ops = &x25_proto_ops;
580 sk->sk_protocol = protocol;
581 sk->sk_backlog_rcv = x25_backlog_rcv;
582
583 x25->t21 = sysctl_x25_call_request_timeout;
584 x25->t22 = sysctl_x25_reset_request_timeout;
585 x25->t23 = sysctl_x25_clear_request_timeout;
586 x25->t2 = sysctl_x25_ack_holdback_timeout;
587 x25->state = X25_STATE_0;
cb65d506 588 x25->cudmatchlength = 0;
ebc3f64b
SP		 589 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */
590 /* on call accept */
1da177e4
LT		 591
592 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
593 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
594 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
595 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
ddd0451f
JH		 596 x25->facilities.throughput = 0; /* by default don't negotiate
597 throughput */
1da177e4 598 x25->facilities.reverse = X25_DEFAULT_REVERSE;
f8e1d201
YH		 599 x25->dte_facilities.calling_len = 0;
600 x25->dte_facilities.called_len = 0;
601 memset(x25->dte_facilities.called_ae, '\0',
602 sizeof(x25->dte_facilities.called_ae));
603 memset(x25->dte_facilities.calling_ae, '\0',
604 sizeof(x25->dte_facilities.calling_ae));
a64b7b93 605
1da177e4
LT		 606 rc = 0;
607out:
608 return rc;
609}
610
611static struct sock *x25_make_new(struct sock *osk)
612{
613 struct sock *sk = NULL;
614 struct x25_sock *x25, *ox25;
615
616 if (osk->sk_type != SOCK_SEQPACKET)
617 goto out;
618
3b1e0a65 619 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
1da177e4
LT		 620 goto out;
621
622 x25 = x25_sk(sk);
623
624 sk->sk_type = osk->sk_type;
1da177e4
LT		 625 sk->sk_priority = osk->sk_priority;
626 sk->sk_protocol = osk->sk_protocol;
627 sk->sk_rcvbuf = osk->sk_rcvbuf;
628 sk->sk_sndbuf = osk->sk_sndbuf;
629 sk->sk_state = TCP_ESTABLISHED;
1da177e4 630 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
a20a8554 631 sock_copy_flags(sk, osk);
1da177e4
LT		 632
633 ox25 = x25_sk(osk);
634 x25->t21 = ox25->t21;
635 x25->t22 = ox25->t22;
636 x25->t23 = ox25->t23;
637 x25->t2 = ox25->t2;
cb863ffd 638 x25->flags = ox25->flags;
1da177e4 639 x25->facilities = ox25->facilities;
a64b7b93 640 x25->dte_facilities = ox25->dte_facilities;
cb65d506 641 x25->cudmatchlength = ox25->cudmatchlength;
ebc3f64b 642 x25->accptapprv = ox25->accptapprv;
1da177e4 643
b7792e34 644 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
1da177e4
LT		 645 x25_init_timers(sk);
646out:
647 return sk;
648}
649
650static int x25_release(struct socket *sock)
651{
652 struct sock *sk = sock->sk;
653 struct x25_sock *x25;
654
91774904 655 lock_kernel();
1da177e4
LT		 656 if (!sk)
657 goto out;
658
659 x25 = x25_sk(sk);
660
661 switch (x25->state) {
662
663 case X25_STATE_0:
664 case X25_STATE_2:
665 x25_disconnect(sk, 0, 0, 0);
666 x25_destroy_socket(sk);
667 goto out;
668
669 case X25_STATE_1:
670 case X25_STATE_3:
671 case X25_STATE_4:
672 x25_clear_queues(sk);
673 x25_write_internal(sk, X25_CLEAR_REQUEST);
674 x25_start_t23timer(sk);
675 x25->state = X25_STATE_2;
676 sk->sk_state = TCP_CLOSE;
677 sk->sk_shutdown |= SEND_SHUTDOWN;
678 sk->sk_state_change(sk);
679 sock_set_flag(sk, SOCK_DEAD);
680 sock_set_flag(sk, SOCK_DESTROY);
681 break;
682 }
683
c751e4f8 684 sock_orphan(sk);
1da177e4 685out:
91774904 686 unlock_kernel();
1da177e4
LT		 687 return 0;
688}
689
690static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
691{
692 struct sock *sk = sock->sk;
693 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
a9288525 694 int len, i, rc = 0;
1da177e4 695
91774904 696 lock_kernel();
1da177e4
LT		 697 if (!sock_flag(sk, SOCK_ZAPPED) ||
698 addr_len != sizeof(struct sockaddr_x25) ||
91774904
AB		 699 addr->sx25_family != AF_X25) {
700 rc = -EINVAL;
701 goto out;
702 }
1da177e4 703
a9288525 704 len = strlen(addr->sx25_addr.x25_addr);
705 for (i = 0; i < len; i++) {
706 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
707 rc = -EINVAL;
708 goto out;
709 }
710 }
711
1da177e4
LT		 712 x25_sk(sk)->source_addr = addr->sx25_addr;
713 x25_insert_socket(sk);
714 sock_reset_flag(sk, SOCK_ZAPPED);
715 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
91774904
AB		 716out:
717 unlock_kernel();
718 return rc;
1da177e4
LT		 719}
720
721static int x25_wait_for_connection_establishment(struct sock *sk)
722{
723 DECLARE_WAITQUEUE(wait, current);
f8e1d201 724 int rc;
1da177e4 725
aa395145 726 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 727 for (;;) {
728 __set_current_state(TASK_INTERRUPTIBLE);
729 rc = -ERESTARTSYS;
730 if (signal_pending(current))
731 break;
732 rc = sock_error(sk);
733 if (rc) {
734 sk->sk_socket->state = SS_UNCONNECTED;
735 break;
736 }
737 rc = 0;
738 if (sk->sk_state != TCP_ESTABLISHED) {
739 release_sock(sk);
740 schedule();
741 lock_sock(sk);
742 } else
743 break;
744 }
745 __set_current_state(TASK_RUNNING);
aa395145 746 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 747 return rc;
748}
749
750static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
751 int addr_len, int flags)
752{
753 struct sock *sk = sock->sk;
754 struct x25_sock *x25 = x25_sk(sk);
755 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
756 struct x25_route *rt;
757 int rc = 0;
758
91774904 759 lock_kernel();
1da177e4
LT		 760 lock_sock(sk);
761 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
762 sock->state = SS_CONNECTED;
763 goto out; /* Connect completed during a ERESTARTSYS event */
764 }
765
766 rc = -ECONNREFUSED;
767 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
768 sock->state = SS_UNCONNECTED;
769 goto out;
770 }
771
772 rc = -EISCONN; /* No reconnect on a seqpacket socket */
773 if (sk->sk_state == TCP_ESTABLISHED)
774 goto out;
775
f8e1d201 776 sk->sk_state = TCP_CLOSE;
1da177e4
LT		 777 sock->state = SS_UNCONNECTED;
778
779 rc = -EINVAL;
780 if (addr_len != sizeof(struct sockaddr_x25) ||
781 addr->sx25_family != AF_X25)
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))
822 goto out_put_neigh;
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:
831 if (rc)
832 x25_neigh_put(x25->neighbour);
833out_put_route:
834 x25_route_put(rt);
835out:
836 release_sock(sk);
91774904 837 unlock_kernel();
1da177e4
LT		 838 return rc;
839}
840
bac37ec8 841static int x25_wait_for_data(struct sock *sk, long timeout)
1da177e4
LT		 842{
843 DECLARE_WAITQUEUE(wait, current);
844 int rc = 0;
845
aa395145 846 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 847 for (;;) {
848 __set_current_state(TASK_INTERRUPTIBLE);
849 if (sk->sk_shutdown & RCV_SHUTDOWN)
850 break;
851 rc = -ERESTARTSYS;
852 if (signal_pending(current))
853 break;
854 rc = -EAGAIN;
855 if (!timeout)
856 break;
857 rc = 0;
858 if (skb_queue_empty(&sk->sk_receive_queue)) {
859 release_sock(sk);
860 timeout = schedule_timeout(timeout);
861 lock_sock(sk);
862 } else
863 break;
864 }
865 __set_current_state(TASK_RUNNING);
aa395145 866 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 867 return rc;
868}
f8e1d201 869
1da177e4
LT		 870static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
871{
872 struct sock *sk = sock->sk;
873 struct sock *newsk;
874 struct sk_buff *skb;
875 int rc = -EINVAL;
876
91774904 877 lock_kernel();
1da177e4
LT		 878 if (!sk || sk->sk_state != TCP_LISTEN)
879 goto out;
880
881 rc = -EOPNOTSUPP;
882 if (sk->sk_type != SOCK_SEQPACKET)
883 goto out;
884
885 lock_sock(sk);
886 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
887 if (rc)
888 goto out2;
889 skb = skb_dequeue(&sk->sk_receive_queue);
890 rc = -EINVAL;
891 if (!skb->sk)
892 goto out2;
893 newsk = skb->sk;
b61d38e0 894 sock_graft(newsk, newsock);
1da177e4
LT		 895
896 /* Now attach up the new socket */
897 skb->sk = NULL;
898 kfree_skb(skb);
899 sk->sk_ack_backlog--;
1da177e4
LT		 900 newsock->state = SS_CONNECTED;
901 rc = 0;
902out2:
903 release_sock(sk);
904out:
91774904 905 unlock_kernel();
1da177e4
LT		 906 return rc;
907}
908
909static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
910 int *uaddr_len, int peer)
911{
912 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
913 struct sock *sk = sock->sk;
914 struct x25_sock *x25 = x25_sk(sk);
91774904 915 int rc = 0;
1da177e4 916
91774904 917 lock_kernel();
1da177e4 918 if (peer) {
91774904
AB		 919 if (sk->sk_state != TCP_ESTABLISHED) {
920 rc = -ENOTCONN;
921 goto out;
922 }
1da177e4
LT		 923 sx25->sx25_addr = x25->dest_addr;
924 } else
925 sx25->sx25_addr = x25->source_addr;
926
927 sx25->sx25_family = AF_X25;
928 *uaddr_len = sizeof(*sx25);
929
91774904
AB		 930out:
931 unlock_kernel();
932 return rc;
933}
934
935static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
936 poll_table *wait)
937{
938 int rc;
939
940 lock_kernel();
941 rc = datagram_poll(file, sock, wait);
942 unlock_kernel();
943
944 return rc;
1da177e4 945}
f8e1d201 946
1da177e4
LT		 947int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
948 unsigned int lci)
949{
950 struct sock *sk;
951 struct sock *make;
952 struct x25_sock *makex25;
953 struct x25_address source_addr, dest_addr;
954 struct x25_facilities facilities;
a64b7b93 955 struct x25_dte_facilities dte_facilities;
95a9dc43 956 int len, addr_len, rc;
1da177e4
LT		 957
958 /*
959 * Remove the LCI and frame type.
960 */
961 skb_pull(skb, X25_STD_MIN_LEN);
962
963 /*
964 * Extract the X.25 addresses and convert them to ASCII strings,
965 * and remove them.
f5eb917b
JH		 966 *
967 * Address block is mandatory in call request packets
1da177e4 968 */
f5eb917b
JH		 969 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
970 if (addr_len <= 0)
971 goto out_clear_request;
95a9dc43 972 skb_pull(skb, addr_len);
1da177e4
LT		 973
974 /*
975 * Get the length of the facilities, skip past them for the moment
976 * get the call user data because this is needed to determine
977 * the correct listener
f5eb917b
JH		 978 *
979 * Facilities length is mandatory in call request packets
1da177e4 980 */
f5eb917b
JH		 981 if (skb->len < 1)
982 goto out_clear_request;
1da177e4 983 len = skb->data[0] + 1;
f5eb917b
JH		 984 if (skb->len < len)
985 goto out_clear_request;
1da177e4
LT		 986 skb_pull(skb,len);
987
1da177e4
LT		 988 /*
989 * Find a listener for the particular address/cud pair.
990 */
cb65d506
SP		 991 sk = x25_find_listener(&source_addr,skb);
992 skb_push(skb,len);
1da177e4 993
95a9dc43
AH		 994 if (sk != NULL && sk_acceptq_is_full(sk)) {
995 goto out_sock_put;
996 }
997
1da177e4 998 /*
95a9dc43
AH		 999 * We dont have any listeners for this incoming call.
1000 * Try forwarding it.
1da177e4 1001 */
95a9dc43
AH		 1002 if (sk == NULL) {
1003 skb_push(skb, addr_len + X25_STD_MIN_LEN);
39e21c0d
AH		 1004 if (sysctl_x25_forward &&
1005 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
95a9dc43
AH		 1006 {
1007 /* Call was forwarded, dont process it any more */
1008 kfree_skb(skb);
1009 rc = 1;
1010 goto out;
1011 } else {
1012 /* No listeners, can't forward, clear the call */
1013 goto out_clear_request;
1014 }
1015 }
1da177e4
LT		 1016
1017 /*
1018 * Try to reach a compromise on the requested facilities.
1019 */
a64b7b93
SP		 1020 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1021 if (len == -1)
1da177e4
LT		 1022 goto out_sock_put;
1023
1024 /*
1025 * current neighbour/link might impose additional limits
1026 * on certain facilties
1027 */
1028
1029 x25_limit_facilities(&facilities, nb);
1030
1031 /*
1032 * Try to create a new socket.
1033 */
1034 make = x25_make_new(sk);
1035 if (!make)
1036 goto out_sock_put;
1037
1038 /*
1039 * Remove the facilities
1040 */
1041 skb_pull(skb, len);
1042
1043 skb->sk = make;
1044 make->sk_state = TCP_ESTABLISHED;
1045
1046 makex25 = x25_sk(make);
1047 makex25->lci = lci;
1048 makex25->dest_addr = dest_addr;
1049 makex25->source_addr = source_addr;
1050 makex25->neighbour = nb;
1051 makex25->facilities = facilities;
a64b7b93 1052 makex25->dte_facilities= dte_facilities;
1da177e4 1053 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
cb65d506
SP		 1054 /* ensure no reverse facil on accept */
1055 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
a64b7b93
SP		 1056 /* ensure no calling address extension on accept */
1057 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
cb65d506 1058 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1da177e4 1059
ebc3f64b
SP		 1060 /* Normally all calls are accepted immediatly */
1061 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
1062 x25_write_internal(make, X25_CALL_ACCEPTED);
1063 makex25->state = X25_STATE_3;
1064 }
1da177e4 1065
cb65d506
SP		 1066 /*
1067 * Incoming Call User Data.
1068 */
8db09f26
RK		 1069 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1070 makex25->calluserdata.cudlength = skb->len;
cb65d506 1071
1da177e4
LT		 1072 sk->sk_ack_backlog++;
1073
1074 x25_insert_socket(make);
1075
1076 skb_queue_head(&sk->sk_receive_queue, skb);
1077
1078 x25_start_heartbeat(make);
1079
1080 if (!sock_flag(sk, SOCK_DEAD))
1081 sk->sk_data_ready(sk, skb->len);
1082 rc = 1;
1083 sock_put(sk);
1084out:
1085 return rc;
1086out_sock_put:
1087 sock_put(sk);
1088out_clear_request:
1089 rc = 0;
1090 x25_transmit_clear_request(nb, lci, 0x01);
1091 goto out;
1092}
1093
1094static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1095 struct msghdr *msg, size_t len)
1096{
1097 struct sock *sk = sock->sk;
1098 struct x25_sock *x25 = x25_sk(sk);
1099 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1100 struct sockaddr_x25 sx25;
1101 struct sk_buff *skb;
1102 unsigned char *asmptr;
1103 int noblock = msg->msg_flags & MSG_DONTWAIT;
1104 size_t size;
1105 int qbit = 0, rc = -EINVAL;
1106
91774904 1107 lock_kernel();
1da177e4
LT		 1108 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1109 goto out;
1110
1111 /* we currently don't support segmented records at the user interface */
1112 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1113 goto out;
1114
1115 rc = -EADDRNOTAVAIL;
1116 if (sock_flag(sk, SOCK_ZAPPED))
1117 goto out;
1118
1119 rc = -EPIPE;
1120 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1121 send_sig(SIGPIPE, current, 0);
1122 goto out;
1123 }
1124
1125 rc = -ENETUNREACH;
1126 if (!x25->neighbour)
1127 goto out;
1128
1129 if (usx25) {
1130 rc = -EINVAL;
1131 if (msg->msg_namelen < sizeof(sx25))
1132 goto out;
1133 memcpy(&sx25, usx25, sizeof(sx25));
1134 rc = -EISCONN;
1135 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1136 goto out;
1137 rc = -EINVAL;
1138 if (sx25.sx25_family != AF_X25)
1139 goto out;
1140 } else {
1141 /*
1142 * FIXME 1003.1g - if the socket is like this because
1143 * it has become closed (not started closed) we ought
1144 * to SIGPIPE, EPIPE;
1145 */
1146 rc = -ENOTCONN;
1147 if (sk->sk_state != TCP_ESTABLISHED)
1148 goto out;
1149
1150 sx25.sx25_family = AF_X25;
1151 sx25.sx25_addr = x25->dest_addr;
1152 }
1153
83e0bbcb
AC		 1154 /* Sanity check the packet size */
1155 if (len > 65535) {
1156 rc = -EMSGSIZE;
1157 goto out;
1158 }
1159
1da177e4
LT		 1160 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1161
1162 /* Build a packet */
1163 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1164
1165 if ((msg->msg_flags & MSG_OOB) && len > 32)
1166 len = 32;
1167
1168 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1169
1170 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1171 if (!skb)
1172 goto out;
1173 X25_SKB_CB(skb)->flags = msg->msg_flags;
1174
1175 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1176
1177 /*
1178 * Put the data on the end
1179 */
1180 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1181
eeeb0374
ACM		 1182 skb_reset_transport_header(skb);
1183 skb_put(skb, len);
1da177e4 1184
eeeb0374 1185 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1da177e4
LT		 1186 if (rc)
1187 goto out_kfree_skb;
1188
1189 /*
1190 * If the Q BIT Include socket option is in force, the first
1191 * byte of the user data is the logical value of the Q Bit.
1192 */
cb863ffd 1193 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1194 qbit = skb->data[0];
1195 skb_pull(skb, 1);
1196 }
1197
1198 /*
1199 * Push down the X.25 header
1200 */
1201 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1202
1203 if (msg->msg_flags & MSG_OOB) {
1204 if (x25->neighbour->extended) {
1205 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1206 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1207 *asmptr++ = (x25->lci >> 0) & 0xFF;
1208 *asmptr++ = X25_INTERRUPT;
1209 } else {
1210 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1211 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1212 *asmptr++ = (x25->lci >> 0) & 0xFF;
1213 *asmptr++ = X25_INTERRUPT;
1214 }
1215 } else {
1216 if (x25->neighbour->extended) {
1217 /* Build an Extended X.25 header */
1218 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1219 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1220 *asmptr++ = (x25->lci >> 0) & 0xFF;
1221 *asmptr++ = X25_DATA;
1222 *asmptr++ = X25_DATA;
1223 } else {
1224 /* Build an Standard X.25 header */
1225 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1226 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1227 *asmptr++ = (x25->lci >> 0) & 0xFF;
1228 *asmptr++ = X25_DATA;
1229 }
1230
1231 if (qbit)
1232 skb->data[0] |= X25_Q_BIT;
1233 }
1234
1235 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1236 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1237
1238 rc = -ENOTCONN;
1239 if (sk->sk_state != TCP_ESTABLISHED)
1240 goto out_kfree_skb;
1241
1242 if (msg->msg_flags & MSG_OOB)
1243 skb_queue_tail(&x25->interrupt_out_queue, skb);
1244 else {
8db09f26
RK		 1245 rc = x25_output(sk, skb);
1246 len = rc;
1247 if (rc < 0)
1da177e4 1248 kfree_skb(skb);
cb863ffd 1249 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1da177e4
LT		 1250 len++;
1251 }
1252
1253 /*
1254 * lock_sock() is currently only used to serialize this x25_kick()
1255 * against input-driven x25_kick() calls. It currently only blocks
1256 * incoming packets for this socket and does not protect against
1257 * any other socket state changes and is not called from anywhere
1258 * else. As x25_kick() cannot block and as long as all socket
1259 * operations are BKL-wrapped, we don't need take to care about
1260 * purging the backlog queue in x25_release().
1261 *
1262 * Using lock_sock() to protect all socket operations entirely
1263 * (and making the whole x25 stack SMP aware) unfortunately would
1264 * require major changes to {send,recv}msg and skb allocation methods.
1265 * -> 2.5 ;)
1266 */
1267 lock_sock(sk);
1268 x25_kick(sk);
1269 release_sock(sk);
1270 rc = len;
1271out:
91774904 1272 unlock_kernel();
1da177e4
LT		 1273 return rc;
1274out_kfree_skb:
1275 kfree_skb(skb);
1276 goto out;
1277}
1278
1279
1280static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1281 struct msghdr *msg, size_t size,
1282 int flags)
1283{
1284 struct sock *sk = sock->sk;
1285 struct x25_sock *x25 = x25_sk(sk);
1286 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1287 size_t copied;
1288 int qbit;
1289 struct sk_buff *skb;
1290 unsigned char *asmptr;
1291 int rc = -ENOTCONN;
1292
91774904 1293 lock_kernel();
1da177e4
LT		 1294 /*
1295 * This works for seqpacket too. The receiver has ordered the queue for
1296 * us! We do one quick check first though
1297 */
1298 if (sk->sk_state != TCP_ESTABLISHED)
1299 goto out;
1300
1301 if (flags & MSG_OOB) {
1302 rc = -EINVAL;
1303 if (sock_flag(sk, SOCK_URGINLINE) ||
1304 !skb_peek(&x25->interrupt_in_queue))
1305 goto out;
1306
1307 skb = skb_dequeue(&x25->interrupt_in_queue);
1308
1309 skb_pull(skb, X25_STD_MIN_LEN);
1310
1311 /*
1312 * No Q bit information on Interrupt data.
1313 */
cb863ffd 1314 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1315 asmptr = skb_push(skb, 1);
1316 *asmptr = 0x00;
1317 }
1318
1319 msg->msg_flags |= MSG_OOB;
1320 } else {
1321 /* Now we can treat all alike */
1322 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1323 flags & MSG_DONTWAIT, &rc);
1324 if (!skb)
1325 goto out;
1326
1327 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1328
1329 skb_pull(skb, x25->neighbour->extended ?
1330 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1331
cb863ffd 1332 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1333 asmptr = skb_push(skb, 1);
1334 *asmptr = qbit;
1335 }
1336 }
1337
badff6d0 1338 skb_reset_transport_header(skb);
1da177e4
LT		 1339 copied = skb->len;
1340
1341 if (copied > size) {
1342 copied = size;
1343 msg->msg_flags |= MSG_TRUNC;
1344 }
1345
f8e1d201 1346 /* Currently, each datagram always contains a complete record */
1da177e4
LT		 1347 msg->msg_flags |= MSG_EOR;
1348
1349 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1350 if (rc)
1351 goto out_free_dgram;
1352
1353 if (sx25) {
1354 sx25->sx25_family = AF_X25;
1355 sx25->sx25_addr = x25->dest_addr;
1356 }
1357
1358 msg->msg_namelen = sizeof(struct sockaddr_x25);
1359
1360 lock_sock(sk);
1361 x25_check_rbuf(sk);
1362 release_sock(sk);
1363 rc = copied;
1364out_free_dgram:
1365 skb_free_datagram(sk, skb);
1366out:
91774904 1367 unlock_kernel();
1da177e4
LT		 1368 return rc;
1369}
1370
1371
1372static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1373{
1374 struct sock *sk = sock->sk;
1375 struct x25_sock *x25 = x25_sk(sk);
1376 void __user *argp = (void __user *)arg;
1377 int rc;
1378
91774904 1379 lock_kernel();
1da177e4
LT		 1380 switch (cmd) {
1381 case TIOCOUTQ: {
31e6d363
ED		 1382 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1383
1da177e4
LT		 1384 if (amount < 0)
1385 amount = 0;
1386 rc = put_user(amount, (unsigned int __user *)argp);
1387 break;
1388 }
1389
1390 case TIOCINQ: {
1391 struct sk_buff *skb;
1392 int amount = 0;
1393 /*
1394 * These two are safe on a single CPU system as
1395 * only user tasks fiddle here
1396 */
1397 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1398 amount = skb->len;
1399 rc = put_user(amount, (unsigned int __user *)argp);
1400 break;
1401 }
1402
1403 case SIOCGSTAMP:
1404 rc = -EINVAL;
1405 if (sk)
f8e1d201
YH		 1406 rc = sock_get_timestamp(sk,
1407 (struct timeval __user *)argp);
1da177e4 1408 break;
ae40eb1e
ED		 1409 case SIOCGSTAMPNS:
1410 rc = -EINVAL;
1411 if (sk)
1412 rc = sock_get_timestampns(sk,
1413 (struct timespec __user *)argp);
1414 break;
1da177e4
LT		 1415 case SIOCGIFADDR:
1416 case SIOCSIFADDR:
1417 case SIOCGIFDSTADDR:
1418 case SIOCSIFDSTADDR:
1419 case SIOCGIFBRDADDR:
1420 case SIOCSIFBRDADDR:
1421 case SIOCGIFNETMASK:
1422 case SIOCSIFNETMASK:
1423 case SIOCGIFMETRIC:
1424 case SIOCSIFMETRIC:
1425 rc = -EINVAL;
1426 break;
1427 case SIOCADDRT:
1428 case SIOCDELRT:
1429 rc = -EPERM;
1430 if (!capable(CAP_NET_ADMIN))
1431 break;
1432 rc = x25_route_ioctl(cmd, argp);
1433 break;
1434 case SIOCX25GSUBSCRIP:
1435 rc = x25_subscr_ioctl(cmd, argp);
1436 break;
1437 case SIOCX25SSUBSCRIP:
1438 rc = -EPERM;
1439 if (!capable(CAP_NET_ADMIN))
1440 break;
1441 rc = x25_subscr_ioctl(cmd, argp);
1442 break;
1443 case SIOCX25GFACILITIES: {
1444 struct x25_facilities fac = x25->facilities;
1445 rc = copy_to_user(argp, &fac,
1446 sizeof(fac)) ? -EFAULT : 0;
1447 break;
1448 }
1449
1450 case SIOCX25SFACILITIES: {
1451 struct x25_facilities facilities;
1452 rc = -EFAULT;
1453 if (copy_from_user(&facilities, argp,
1454 sizeof(facilities)))
1455 break;
1456 rc = -EINVAL;
1457 if (sk->sk_state != TCP_LISTEN &&
1458 sk->sk_state != TCP_CLOSE)
1459 break;
1460 if (facilities.pacsize_in < X25_PS16 ||
1461 facilities.pacsize_in > X25_PS4096)
1462 break;
1463 if (facilities.pacsize_out < X25_PS16 ||
1464 facilities.pacsize_out > X25_PS4096)
1465 break;
1466 if (facilities.winsize_in < 1 ||
1467 facilities.winsize_in > 127)
1468 break;
ddd0451f
JH		 1469 if (facilities.throughput) {
1470 int out = facilities.throughput & 0xf0;
1471 int in = facilities.throughput & 0x0f;
1472 if (!out)
1473 facilities.throughput |=
1474 X25_DEFAULT_THROUGHPUT << 4;
1475 else if (out < 0x30 || out > 0xD0)
1476 break;
1477 if (!in)
1478 facilities.throughput |=
1479 X25_DEFAULT_THROUGHPUT;
1480 else if (in < 0x03 || in > 0x0D)
1481 break;
1482 }
ebc3f64b 1483 if (facilities.reverse &&
06a96b33 1484 (facilities.reverse & 0x81) != 0x81)
1da177e4
LT		 1485 break;
1486 x25->facilities = facilities;
1487 rc = 0;
1488 break;
1489 }
1490
a64b7b93 1491 case SIOCX25GDTEFACILITIES: {
f8e1d201 1492 rc = copy_to_user(argp, &x25->dte_facilities,
a64b7b93
SP		 1493 sizeof(x25->dte_facilities));
1494 if (rc)
1495 rc = -EFAULT;
f8e1d201
YH		 1496 break;
1497 }
a64b7b93 1498
f8e1d201
YH		 1499 case SIOCX25SDTEFACILITIES: {
1500 struct x25_dte_facilities dtefacs;
1501 rc = -EFAULT;
1502 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
a64b7b93
SP		 1503 break;
1504 rc = -EINVAL;
1505 if (sk->sk_state != TCP_LISTEN &&
1506 sk->sk_state != TCP_CLOSE)
1507 break;
1508 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1509 break;
1510 if (dtefacs.calling_ae == NULL)
1511 break;
1512 if (dtefacs.called_len > X25_MAX_AE_LEN)
1513 break;
1514 if (dtefacs.called_ae == NULL)
1515 break;
1516 x25->dte_facilities = dtefacs;
1517 rc = 0;
1518 break;
1519 }
1520
1da177e4
LT		 1521 case SIOCX25GCALLUSERDATA: {
1522 struct x25_calluserdata cud = x25->calluserdata;
1523 rc = copy_to_user(argp, &cud,
1524 sizeof(cud)) ? -EFAULT : 0;
1525 break;
1526 }
1527
1528 case SIOCX25SCALLUSERDATA: {
1529 struct x25_calluserdata calluserdata;
1530
1531 rc = -EFAULT;
1532 if (copy_from_user(&calluserdata, argp,
1533 sizeof(calluserdata)))
1534 break;
1535 rc = -EINVAL;
1536 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1537 break;
1538 x25->calluserdata = calluserdata;
1539 rc = 0;
1540 break;
1541 }
1542
1543 case SIOCX25GCAUSEDIAG: {
1544 struct x25_causediag causediag;
1545 causediag = x25->causediag;
1546 rc = copy_to_user(argp, &causediag,
1547 sizeof(causediag)) ? -EFAULT : 0;
1548 break;
1549 }
1550
386e50cc
AH		 1551 case SIOCX25SCAUSEDIAG: {
1552 struct x25_causediag causediag;
1553 rc = -EFAULT;
1554 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1555 break;
1556 x25->causediag = causediag;
1557 rc = 0;
1558 break;
1559
1560 }
1561
cb65d506
SP		 1562 case SIOCX25SCUDMATCHLEN: {
1563 struct x25_subaddr sub_addr;
1564 rc = -EINVAL;
1565 if(sk->sk_state != TCP_CLOSE)
1566 break;
1567 rc = -EFAULT;
1568 if (copy_from_user(&sub_addr, argp,
1569 sizeof(sub_addr)))
1570 break;
f8e1d201 1571 rc = -EINVAL;
cb65d506
SP		 1572 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1573 break;
1574 x25->cudmatchlength = sub_addr.cudmatchlength;
1575 rc = 0;
1576 break;
1577 }
1578
ebc3f64b
SP		 1579 case SIOCX25CALLACCPTAPPRV: {
1580 rc = -EINVAL;
1581 if (sk->sk_state != TCP_CLOSE)
1582 break;
1583 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1584 rc = 0;
1585 break;
1586 }
1587
1588 case SIOCX25SENDCALLACCPT: {
1589 rc = -EINVAL;
1590 if (sk->sk_state != TCP_ESTABLISHED)
1591 break;
1592 if (x25->accptapprv) /* must call accptapprv above */
1593 break;
1594 x25_write_internal(sk, X25_CALL_ACCEPTED);
1595 x25->state = X25_STATE_3;
1596 rc = 0;
1597 break;
1598 }
1599
f8e1d201 1600 default:
b5e5fa5e 1601 rc = -ENOIOCTLCMD;
1da177e4
LT		 1602 break;
1603 }
91774904 1604 unlock_kernel();
1da177e4
LT		 1605
1606 return rc;
1607}
1608
ec1b4cf7 1609static const struct net_proto_family x25_family_ops = {
1da177e4
LT		 1610 .family = AF_X25,
1611 .create = x25_create,
1612 .owner = THIS_MODULE,
1613};
1614
1b06e6ba
SP		 1615#ifdef CONFIG_COMPAT
1616static int compat_x25_subscr_ioctl(unsigned int cmd,
1617 struct compat_x25_subscrip_struct __user *x25_subscr32)
1618{
1619 struct compat_x25_subscrip_struct x25_subscr;
1620 struct x25_neigh *nb;
1621 struct net_device *dev;
1622 int rc = -EINVAL;
1623
1624 rc = -EFAULT;
1625 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1626 goto out;
1627
1628 rc = -EINVAL;
1629 dev = x25_dev_get(x25_subscr.device);
1630 if (dev == NULL)
1631 goto out;
1632
1633 nb = x25_get_neigh(dev);
1634 if (nb == NULL)
1635 goto out_dev_put;
1636
1637 dev_put(dev);
1638
1639 if (cmd == SIOCX25GSUBSCRIP) {
1640 x25_subscr.extended = nb->extended;
1641 x25_subscr.global_facil_mask = nb->global_facil_mask;
1642 rc = copy_to_user(x25_subscr32, &x25_subscr,
1643 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1644 } else {
1645 rc = -EINVAL;
1646 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1647 rc = 0;
1648 nb->extended = x25_subscr.extended;
1649 nb->global_facil_mask = x25_subscr.global_facil_mask;
1650 }
1651 }
1652 x25_neigh_put(nb);
1653out:
1654 return rc;
1655out_dev_put:
1656 dev_put(dev);
1657 goto out;
1658}
1659
1660static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1661 unsigned long arg)
1662{
1663 void __user *argp = compat_ptr(arg);
1664 struct sock *sk = sock->sk;
1665
1666 int rc = -ENOIOCTLCMD;
1667
1668 switch(cmd) {
1669 case TIOCOUTQ:
1670 case TIOCINQ:
1671 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1672 break;
1673 case SIOCGSTAMP:
1674 rc = -EINVAL;
91774904 1675 lock_kernel();
1b06e6ba
SP		 1676 if (sk)
1677 rc = compat_sock_get_timestamp(sk,
1678 (struct timeval __user*)argp);
91774904 1679 unlock_kernel();
1b06e6ba 1680 break;
ae40eb1e
ED		 1681 case SIOCGSTAMPNS:
1682 rc = -EINVAL;
91774904 1683 lock_kernel();
ae40eb1e
ED		 1684 if (sk)
1685 rc = compat_sock_get_timestampns(sk,
1686 (struct timespec __user*)argp);
91774904 1687 unlock_kernel();
ae40eb1e 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;
91774904 1706 lock_kernel();
1b06e6ba 1707 rc = x25_route_ioctl(cmd, argp);
91774904 1708 unlock_kernel();
1b06e6ba
SP		 1709 break;
1710 case SIOCX25GSUBSCRIP:
91774904 1711 lock_kernel();
1b06e6ba 1712 rc = compat_x25_subscr_ioctl(cmd, argp);
91774904 1713 unlock_kernel();
1b06e6ba
SP		 1714 break;
1715 case SIOCX25SSUBSCRIP:
1716 rc = -EPERM;
1717 if (!capable(CAP_NET_ADMIN))
1718 break;
91774904 1719 lock_kernel();
1b06e6ba 1720 rc = compat_x25_subscr_ioctl(cmd, argp);
91774904 1721 unlock_kernel();
1b06e6ba
SP		 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,
91774904 1753 .poll = x25_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;
1780 struct hlist_node *node;
1781
1782 write_lock_bh(&x25_list_lock);
1783
1784 sk_for_each(s, node, &x25_list)
1785 if (x25_sk(s)->neighbour == nb)
1786 x25_disconnect(s, ENETUNREACH, 0, 0);
1787
1788 write_unlock_bh(&x25_list_lock);
95a9dc43
AH		 1789
1790 /* Remove any related forwards */
1791 x25_clear_forward_by_dev(nb->dev);
1da177e4
LT		 1792}
1793
1794static int __init x25_init(void)
1795{
1796 int rc = proto_register(&x25_proto, 0);
1797
1798 if (rc != 0)
1799 goto out;
1800
1fd975a0 1801 rc = sock_register(&x25_family_ops);
1802 if (rc != 0)
1803 goto out_proto;
1da177e4
LT		 1804
1805 dev_add_pack(&x25_packet_type);
1806
1fd975a0 1807 rc = register_netdevice_notifier(&x25_dev_notifier);
1808 if (rc != 0)
1809 goto out_sock;
1da177e4 1810
a44562e4 1811 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1da177e4 1812
1da177e4 1813 x25_register_sysctl();
1fd975a0 1814 rc = x25_proc_init();
1815 if (rc != 0)
1816 goto out_dev;
1da177e4
LT		 1817out:
1818 return rc;
1fd975a0 1819out_dev:
1820 unregister_netdevice_notifier(&x25_dev_notifier);
1821out_sock:
1822 sock_unregister(AF_X25);
1823out_proto:
1824 proto_unregister(&x25_proto);
1825 goto out;
1da177e4
LT		 1826}
1827module_init(x25_init);
1828
1829static void __exit x25_exit(void)
1830{
1831 x25_proc_exit();
1832 x25_link_free();
1833 x25_route_free();
1834
1da177e4 1835 x25_unregister_sysctl();
1da177e4
LT		 1836
1837 unregister_netdevice_notifier(&x25_dev_notifier);
1838
1839 dev_remove_pack(&x25_packet_type);
1840
1841 sock_unregister(AF_X25);
1842 proto_unregister(&x25_proto);
1843}
1844module_exit(x25_exit);
1845
1846MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1847MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1848MODULE_LICENSE("GPL");
1849MODULE_ALIAS_NETPROTO(PF_X25);
Clone of davem's net-next-2.6 tree