1
2
3
4
5#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
6
7#include <linux/string.h>
8#include <linux/net.h>
9#include <linux/errno.h>
10#include <linux/kernel.h>
11#include <linux/skbuff.h>
12#include <linux/wait.h>
13#include <linux/sched.h>
14#include <linux/fcntl.h>
15#include <linux/init.h>
16#include <linux/atm.h>
17#include <linux/atmsap.h>
18#include <linux/atmsvc.h>
19#include <linux/atmdev.h>
20#include <linux/bitops.h>
21#include <net/sock.h>
22#include <linux/uaccess.h>
23
24#include "resources.h"
25#include "common.h"
26#include "signaling.h"
27#include "addr.h"
28
29static int svc_create(struct net *net, struct socket *sock, int protocol,
30 int kern);
31
32
33
34
35
36
37
38
39static int svc_shutdown(struct socket *sock, int how)
40{
41 return 0;
42}
43
44static void svc_disconnect(struct atm_vcc *vcc)
45{
46 DEFINE_WAIT(wait);
47 struct sk_buff *skb;
48 struct sock *sk = sk_atm(vcc);
49
50 pr_debug("%p\n", vcc);
51 if (test_bit(ATM_VF_REGIS, &vcc->flags)) {
52 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
53 sigd_enq(vcc, as_close, NULL, NULL, NULL);
54 while (!test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) {
55 schedule();
56 prepare_to_wait(sk_sleep(sk), &wait,
57 TASK_UNINTERRUPTIBLE);
58 }
59 finish_wait(sk_sleep(sk), &wait);
60 }
61
62
63 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
64 atm_return(vcc, skb->truesize);
65 pr_debug("LISTEN REL\n");
66 sigd_enq2(NULL, as_reject, vcc, NULL, NULL, &vcc->qos, 0);
67 dev_kfree_skb(skb);
68 }
69 clear_bit(ATM_VF_REGIS, &vcc->flags);
70
71}
72
73static int svc_release(struct socket *sock)
74{
75 struct sock *sk = sock->sk;
76 struct atm_vcc *vcc;
77
78 if (sk) {
79 vcc = ATM_SD(sock);
80 pr_debug("%p\n", vcc);
81 clear_bit(ATM_VF_READY, &vcc->flags);
82
83
84
85
86
87 svc_disconnect(vcc);
88 vcc_release(sock);
89 }
90 return 0;
91}
92
93static int svc_bind(struct socket *sock, struct sockaddr *sockaddr,
94 int sockaddr_len)
95{
96 DEFINE_WAIT(wait);
97 struct sock *sk = sock->sk;
98 struct sockaddr_atmsvc *addr;
99 struct atm_vcc *vcc;
100 int error;
101
102 if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
103 return -EINVAL;
104 lock_sock(sk);
105 if (sock->state == SS_CONNECTED) {
106 error = -EISCONN;
107 goto out;
108 }
109 if (sock->state != SS_UNCONNECTED) {
110 error = -EINVAL;
111 goto out;
112 }
113 vcc = ATM_SD(sock);
114 addr = (struct sockaddr_atmsvc *) sockaddr;
115 if (addr->sas_family != AF_ATMSVC) {
116 error = -EAFNOSUPPORT;
117 goto out;
118 }
119 clear_bit(ATM_VF_BOUND, &vcc->flags);
120
121
122 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
123 error = -EBADFD;
124 goto out;
125 }
126 vcc->local = *addr;
127 set_bit(ATM_VF_WAITING, &vcc->flags);
128 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
129 sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local);
130 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
131 schedule();
132 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
133 }
134 finish_wait(sk_sleep(sk), &wait);
135 clear_bit(ATM_VF_REGIS, &vcc->flags);
136 if (!sigd) {
137 error = -EUNATCH;
138 goto out;
139 }
140 if (!sk->sk_err)
141 set_bit(ATM_VF_BOUND, &vcc->flags);
142 error = -sk->sk_err;
143out:
144 release_sock(sk);
145 return error;
146}
147
148static int svc_connect(struct socket *sock, struct sockaddr *sockaddr,
149 int sockaddr_len, int flags)
150{
151 DEFINE_WAIT(wait);
152 struct sock *sk = sock->sk;
153 struct sockaddr_atmsvc *addr;
154 struct atm_vcc *vcc = ATM_SD(sock);
155 int error;
156
157 pr_debug("%p\n", vcc);
158 lock_sock(sk);
159 if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
160 error = -EINVAL;
161 goto out;
162 }
163
164 switch (sock->state) {
165 default:
166 error = -EINVAL;
167 goto out;
168 case SS_CONNECTED:
169 error = -EISCONN;
170 goto out;
171 case SS_CONNECTING:
172 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
173 error = -EALREADY;
174 goto out;
175 }
176 sock->state = SS_UNCONNECTED;
177 if (sk->sk_err) {
178 error = -sk->sk_err;
179 goto out;
180 }
181 break;
182 case SS_UNCONNECTED:
183 addr = (struct sockaddr_atmsvc *) sockaddr;
184 if (addr->sas_family != AF_ATMSVC) {
185 error = -EAFNOSUPPORT;
186 goto out;
187 }
188 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
189 error = -EBADFD;
190 goto out;
191 }
192 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
193 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
194 error = -EINVAL;
195 goto out;
196 }
197 if (!vcc->qos.txtp.traffic_class &&
198 !vcc->qos.rxtp.traffic_class) {
199 error = -EINVAL;
200 goto out;
201 }
202 vcc->remote = *addr;
203 set_bit(ATM_VF_WAITING, &vcc->flags);
204 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
205 sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote);
206 if (flags & O_NONBLOCK) {
207 finish_wait(sk_sleep(sk), &wait);
208 sock->state = SS_CONNECTING;
209 error = -EINPROGRESS;
210 goto out;
211 }
212 error = 0;
213 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
214 schedule();
215 if (!signal_pending(current)) {
216 prepare_to_wait(sk_sleep(sk), &wait,
217 TASK_INTERRUPTIBLE);
218 continue;
219 }
220 pr_debug("*ABORT*\n");
221
222
223
224
225
226
227
228
229
230
231
232
233 sigd_enq(vcc, as_close, NULL, NULL, NULL);
234 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
235 prepare_to_wait(sk_sleep(sk), &wait,
236 TASK_INTERRUPTIBLE);
237 schedule();
238 }
239 if (!sk->sk_err)
240 while (!test_bit(ATM_VF_RELEASED, &vcc->flags) &&
241 sigd) {
242 prepare_to_wait(sk_sleep(sk), &wait,
243 TASK_INTERRUPTIBLE);
244 schedule();
245 }
246 clear_bit(ATM_VF_REGIS, &vcc->flags);
247 clear_bit(ATM_VF_RELEASED, &vcc->flags);
248 clear_bit(ATM_VF_CLOSE, &vcc->flags);
249
250 error = -EINTR;
251 break;
252 }
253 finish_wait(sk_sleep(sk), &wait);
254 if (error)
255 goto out;
256 if (!sigd) {
257 error = -EUNATCH;
258 goto out;
259 }
260 if (sk->sk_err) {
261 error = -sk->sk_err;
262 goto out;
263 }
264 }
265
266
267
268
269
270 vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
271 vcc->qos.txtp.pcr = 0;
272 vcc->qos.txtp.min_pcr = 0;
273
274
275
276 error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci);
277 if (!error)
278 sock->state = SS_CONNECTED;
279 else
280 (void)svc_disconnect(vcc);
281out:
282 release_sock(sk);
283 return error;
284}
285
286static int svc_listen(struct socket *sock, int backlog)
287{
288 DEFINE_WAIT(wait);
289 struct sock *sk = sock->sk;
290 struct atm_vcc *vcc = ATM_SD(sock);
291 int error;
292
293 pr_debug("%p\n", vcc);
294 lock_sock(sk);
295
296 if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
297 error = -EINVAL;
298 goto out;
299 }
300 if (test_bit(ATM_VF_LISTEN, &vcc->flags)) {
301 error = -EADDRINUSE;
302 goto out;
303 }
304 set_bit(ATM_VF_WAITING, &vcc->flags);
305 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
306 sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local);
307 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
308 schedule();
309 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
310 }
311 finish_wait(sk_sleep(sk), &wait);
312 if (!sigd) {
313 error = -EUNATCH;
314 goto out;
315 }
316 set_bit(ATM_VF_LISTEN, &vcc->flags);
317 vcc_insert_socket(sk);
318 sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
319 error = -sk->sk_err;
320out:
321 release_sock(sk);
322 return error;
323}
324
325static int svc_accept(struct socket *sock, struct socket *newsock, int flags)
326{
327 struct sock *sk = sock->sk;
328 struct sk_buff *skb;
329 struct atmsvc_msg *msg;
330 struct atm_vcc *old_vcc = ATM_SD(sock);
331 struct atm_vcc *new_vcc;
332 int error;
333
334 lock_sock(sk);
335
336 error = svc_create(sock_net(sk), newsock, 0, 0);
337 if (error)
338 goto out;
339
340 new_vcc = ATM_SD(newsock);
341
342 pr_debug("%p -> %p\n", old_vcc, new_vcc);
343 while (1) {
344 DEFINE_WAIT(wait);
345
346 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
347 while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
348 sigd) {
349 if (test_bit(ATM_VF_RELEASED, &old_vcc->flags))
350 break;
351 if (test_bit(ATM_VF_CLOSE, &old_vcc->flags)) {
352 error = -sk->sk_err;
353 break;
354 }
355 if (flags & O_NONBLOCK) {
356 error = -EAGAIN;
357 break;
358 }
359 release_sock(sk);
360 schedule();
361 lock_sock(sk);
362 if (signal_pending(current)) {
363 error = -ERESTARTSYS;
364 break;
365 }
366 prepare_to_wait(sk_sleep(sk), &wait,
367 TASK_INTERRUPTIBLE);
368 }
369 finish_wait(sk_sleep(sk), &wait);
370 if (error)
371 goto out;
372 if (!skb) {
373 error = -EUNATCH;
374 goto out;
375 }
376 msg = (struct atmsvc_msg *)skb->data;
377 new_vcc->qos = msg->qos;
378 set_bit(ATM_VF_HASQOS, &new_vcc->flags);
379 new_vcc->remote = msg->svc;
380 new_vcc->local = msg->local;
381 new_vcc->sap = msg->sap;
382 error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
383 msg->pvc.sap_addr.vpi,
384 msg->pvc.sap_addr.vci);
385 dev_kfree_skb(skb);
386 sk->sk_ack_backlog--;
387 if (error) {
388 sigd_enq2(NULL, as_reject, old_vcc, NULL, NULL,
389 &old_vcc->qos, error);
390 error = error == -EAGAIN ? -EBUSY : error;
391 goto out;
392 }
393
394 set_bit(ATM_VF_WAITING, &new_vcc->flags);
395 prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
396 TASK_UNINTERRUPTIBLE);
397 sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL);
398 while (test_bit(ATM_VF_WAITING, &new_vcc->flags) && sigd) {
399 release_sock(sk);
400 schedule();
401 lock_sock(sk);
402 prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
403 TASK_UNINTERRUPTIBLE);
404 }
405 finish_wait(sk_sleep(sk_atm(new_vcc)), &wait);
406 if (!sigd) {
407 error = -EUNATCH;
408 goto out;
409 }
410 if (!sk_atm(new_vcc)->sk_err)
411 break;
412 if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
413 error = -sk_atm(new_vcc)->sk_err;
414 goto out;
415 }
416 }
417 newsock->state = SS_CONNECTED;
418out:
419 release_sock(sk);
420 return error;
421}
422
423static int svc_getname(struct socket *sock, struct sockaddr *sockaddr,
424 int *sockaddr_len, int peer)
425{
426 struct sockaddr_atmsvc *addr;
427
428 *sockaddr_len = sizeof(struct sockaddr_atmsvc);
429 addr = (struct sockaddr_atmsvc *) sockaddr;
430 memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
431 sizeof(struct sockaddr_atmsvc));
432 return 0;
433}
434
435int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
436{
437 struct sock *sk = sk_atm(vcc);
438 DEFINE_WAIT(wait);
439
440 set_bit(ATM_VF_WAITING, &vcc->flags);
441 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
442 sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0);
443 while (test_bit(ATM_VF_WAITING, &vcc->flags) &&
444 !test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) {
445 schedule();
446 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
447 }
448 finish_wait(sk_sleep(sk), &wait);
449 if (!sigd)
450 return -EUNATCH;
451 return -sk->sk_err;
452}
453
454static int svc_setsockopt(struct socket *sock, int level, int optname,
455 char __user *optval, unsigned int optlen)
456{
457 struct sock *sk = sock->sk;
458 struct atm_vcc *vcc = ATM_SD(sock);
459 int value, error = 0;
460
461 lock_sock(sk);
462 switch (optname) {
463 case SO_ATMSAP:
464 if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
465 error = -EINVAL;
466 goto out;
467 }
468 if (copy_from_user(&vcc->sap, optval, optlen)) {
469 error = -EFAULT;
470 goto out;
471 }
472 set_bit(ATM_VF_HASSAP, &vcc->flags);
473 break;
474 case SO_MULTIPOINT:
475 if (level != SOL_ATM || optlen != sizeof(int)) {
476 error = -EINVAL;
477 goto out;
478 }
479 if (get_user(value, (int __user *)optval)) {
480 error = -EFAULT;
481 goto out;
482 }
483 if (value == 1)
484 set_bit(ATM_VF_SESSION, &vcc->flags);
485 else if (value == 0)
486 clear_bit(ATM_VF_SESSION, &vcc->flags);
487 else
488 error = -EINVAL;
489 break;
490 default:
491 error = vcc_setsockopt(sock, level, optname, optval, optlen);
492 }
493
494out:
495 release_sock(sk);
496 return error;
497}
498
499static int svc_getsockopt(struct socket *sock, int level, int optname,
500 char __user *optval, int __user *optlen)
501{
502 struct sock *sk = sock->sk;
503 int error = 0, len;
504
505 lock_sock(sk);
506 if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
507 error = vcc_getsockopt(sock, level, optname, optval, optlen);
508 goto out;
509 }
510 if (get_user(len, optlen)) {
511 error = -EFAULT;
512 goto out;
513 }
514 if (len != sizeof(struct atm_sap)) {
515 error = -EINVAL;
516 goto out;
517 }
518 if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
519 error = -EFAULT;
520 goto out;
521 }
522out:
523 release_sock(sk);
524 return error;
525}
526
527static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
528 int sockaddr_len, int flags)
529{
530 DEFINE_WAIT(wait);
531 struct sock *sk = sock->sk;
532 struct atm_vcc *vcc = ATM_SD(sock);
533 int error;
534
535 lock_sock(sk);
536 set_bit(ATM_VF_WAITING, &vcc->flags);
537 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
538 sigd_enq(vcc, as_addparty, NULL, NULL,
539 (struct sockaddr_atmsvc *) sockaddr);
540 if (flags & O_NONBLOCK) {
541 finish_wait(sk_sleep(sk), &wait);
542 error = -EINPROGRESS;
543 goto out;
544 }
545 pr_debug("added wait queue\n");
546 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
547 schedule();
548 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
549 }
550 finish_wait(sk_sleep(sk), &wait);
551 error = xchg(&sk->sk_err_soft, 0);
552out:
553 release_sock(sk);
554 return error;
555}
556
557static int svc_dropparty(struct socket *sock, int ep_ref)
558{
559 DEFINE_WAIT(wait);
560 struct sock *sk = sock->sk;
561 struct atm_vcc *vcc = ATM_SD(sock);
562 int error;
563
564 lock_sock(sk);
565 set_bit(ATM_VF_WAITING, &vcc->flags);
566 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
567 sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
568 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
569 schedule();
570 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
571 }
572 finish_wait(sk_sleep(sk), &wait);
573 if (!sigd) {
574 error = -EUNATCH;
575 goto out;
576 }
577 error = xchg(&sk->sk_err_soft, 0);
578out:
579 release_sock(sk);
580 return error;
581}
582
583static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
584{
585 int error, ep_ref;
586 struct sockaddr_atmsvc sa;
587 struct atm_vcc *vcc = ATM_SD(sock);
588
589 switch (cmd) {
590 case ATM_ADDPARTY:
591 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
592 return -EINVAL;
593 if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
594 return -EFAULT;
595 error = svc_addparty(sock, (struct sockaddr *)&sa, sizeof(sa),
596 0);
597 break;
598 case ATM_DROPPARTY:
599 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
600 return -EINVAL;
601 if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
602 return -EFAULT;
603 error = svc_dropparty(sock, ep_ref);
604 break;
605 default:
606 error = vcc_ioctl(sock, cmd, arg);
607 }
608
609 return error;
610}
611
612#ifdef CONFIG_COMPAT
613static int svc_compat_ioctl(struct socket *sock, unsigned int cmd,
614 unsigned long arg)
615{
616
617
618
619 if (cmd == COMPAT_ATM_ADDPARTY)
620 cmd = ATM_ADDPARTY;
621
622 if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY)
623 return svc_ioctl(sock, cmd, arg);
624 else
625 return vcc_compat_ioctl(sock, cmd, arg);
626}
627#endif
628
629static const struct proto_ops svc_proto_ops = {
630 .family = PF_ATMSVC,
631 .owner = THIS_MODULE,
632
633 .release = svc_release,
634 .bind = svc_bind,
635 .connect = svc_connect,
636 .socketpair = sock_no_socketpair,
637 .accept = svc_accept,
638 .getname = svc_getname,
639 .poll = vcc_poll,
640 .ioctl = svc_ioctl,
641#ifdef CONFIG_COMPAT
642 .compat_ioctl = svc_compat_ioctl,
643#endif
644 .listen = svc_listen,
645 .shutdown = svc_shutdown,
646 .setsockopt = svc_setsockopt,
647 .getsockopt = svc_getsockopt,
648 .sendmsg = vcc_sendmsg,
649 .recvmsg = vcc_recvmsg,
650 .mmap = sock_no_mmap,
651 .sendpage = sock_no_sendpage,
652};
653
654
655static int svc_create(struct net *net, struct socket *sock, int protocol,
656 int kern)
657{
658 int error;
659
660 if (!net_eq(net, &init_net))
661 return -EAFNOSUPPORT;
662
663 sock->ops = &svc_proto_ops;
664 error = vcc_create(net, sock, protocol, AF_ATMSVC);
665 if (error)
666 return error;
667 ATM_SD(sock)->local.sas_family = AF_ATMSVC;
668 ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
669 return 0;
670}
671
672static const struct net_proto_family svc_family_ops = {
673 .family = PF_ATMSVC,
674 .create = svc_create,
675 .owner = THIS_MODULE,
676};
677
678
679
680
681
682
683int __init atmsvc_init(void)
684{
685 return sock_register(&svc_family_ops);
686}
687
688void atmsvc_exit(void)
689{
690 sock_unregister(PF_ATMSVC);
691}
692
