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1// SPDX-License-Identifier: GPL-2.0
2/* net/atm/svc.c - ATM SVC sockets */
3
4/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
5
6#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
7
8#include <linux/string.h>
9#include <linux/net.h> /* struct socket, struct proto_ops */
10#include <linux/errno.h> /* error codes */
11#include <linux/kernel.h> /* printk */
12#include <linux/skbuff.h>
13#include <linux/wait.h>
14#include <linux/sched/signal.h>
15#include <linux/fcntl.h> /* O_NONBLOCK */
16#include <linux/init.h>
17#include <linux/atm.h> /* ATM stuff */
18#include <linux/atmsap.h>
19#include <linux/atmsvc.h>
20#include <linux/atmdev.h>
21#include <linux/bitops.h>
22#include <net/sock.h> /* for sock_no_* */
23#include <linux/uaccess.h>
24#include <linux/export.h>
25
26#include "resources.h"
27#include "common.h" /* common for PVCs and SVCs */
28#include "signaling.h"
29#include "addr.h"
30
31static int svc_create(struct net *net, struct socket *sock, int protocol,
32 int kern);
33
34/*
35 * Note: since all this is still nicely synchronized with the signaling demon,
36 * there's no need to protect sleep loops with clis. If signaling is
37 * moved into the kernel, that would change.
38 */
39
40
41static int svc_shutdown(struct socket *sock, int how)
42{
43 return 0;
44}
45
46static void svc_disconnect(struct atm_vcc *vcc)
47{
48 DEFINE_WAIT(wait);
49 struct sk_buff *skb;
50 struct sock *sk = sk_atm(vcc);
51
52 pr_debug("%p\n", vcc);
53 if (test_bit(ATM_VF_REGIS, &vcc->flags)) {
54 sigd_enq(vcc, as_close, NULL, NULL, NULL);
55 for (;;) {
56 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
57 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd)
58 break;
59 schedule();
60 }
61 finish_wait(sk_sleep(sk), &wait);
62 }
63 /* beware - socket is still in use by atmsigd until the last
64 as_indicate has been answered */
65 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
66 atm_return(vcc, skb->truesize);
67 pr_debug("LISTEN REL\n");
68 sigd_enq2(NULL, as_reject, vcc, NULL, NULL, &vcc->qos, 0);
69 dev_kfree_skb(skb);
70 }
71 clear_bit(ATM_VF_REGIS, &vcc->flags);
72 /* ... may retry later */
73}
74
75static int svc_release(struct socket *sock)
76{
77 struct sock *sk = sock->sk;
78 struct atm_vcc *vcc;
79
80 if (sk) {
81 vcc = ATM_SD(sock);
82 pr_debug("%p\n", vcc);
83 clear_bit(ATM_VF_READY, &vcc->flags);
84 /*
85 * VCC pointer is used as a reference,
86 * so we must not free it (thereby subjecting it to re-use)
87 * before all pending connections are closed
88 */
89 svc_disconnect(vcc);
90 vcc_release(sock);
91 }
92 return 0;
93}
94
95static int svc_bind(struct socket *sock, struct sockaddr *sockaddr,
96 int sockaddr_len)
97{
98 DEFINE_WAIT(wait);
99 struct sock *sk = sock->sk;
100 struct sockaddr_atmsvc *addr;
101 struct atm_vcc *vcc;
102 int error;
103
104 if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
105 return -EINVAL;
106 lock_sock(sk);
107 if (sock->state == SS_CONNECTED) {
108 error = -EISCONN;
109 goto out;
110 }
111 if (sock->state != SS_UNCONNECTED) {
112 error = -EINVAL;
113 goto out;
114 }
115 vcc = ATM_SD(sock);
116 addr = (struct sockaddr_atmsvc *) sockaddr;
117 if (addr->sas_family != AF_ATMSVC) {
118 error = -EAFNOSUPPORT;
119 goto out;
120 }
121 clear_bit(ATM_VF_BOUND, &vcc->flags);
122 /* failing rebind will kill old binding */
123 /* @@@ check memory (de)allocation on rebind */
124 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
125 error = -EBADFD;
126 goto out;
127 }
128 vcc->local = *addr;
129 set_bit(ATM_VF_WAITING, &vcc->flags);
130 sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local);
131 for (;;) {
132 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
133 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
134 break;
135 schedule();
136 }
137 finish_wait(sk_sleep(sk), &wait);
138 clear_bit(ATM_VF_REGIS, &vcc->flags); /* doesn't count */
139 if (!sigd) {
140 error = -EUNATCH;
141 goto out;
142 }
143 if (!sk->sk_err)
144 set_bit(ATM_VF_BOUND, &vcc->flags);
145 error = -sk->sk_err;
146out:
147 release_sock(sk);
148 return error;
149}
150
151static int svc_connect(struct socket *sock, struct sockaddr *sockaddr,
152 int sockaddr_len, int flags)
153{
154 DEFINE_WAIT(wait);
155 struct sock *sk = sock->sk;
156 struct sockaddr_atmsvc *addr;
157 struct atm_vcc *vcc = ATM_SD(sock);
158 int error;
159
160 pr_debug("%p\n", vcc);
161 lock_sock(sk);
162 if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
163 error = -EINVAL;
164 goto out;
165 }
166
167 switch (sock->state) {
168 default:
169 error = -EINVAL;
170 goto out;
171 case SS_CONNECTED:
172 error = -EISCONN;
173 goto out;
174 case SS_CONNECTING:
175 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
176 error = -EALREADY;
177 goto out;
178 }
179 sock->state = SS_UNCONNECTED;
180 if (sk->sk_err) {
181 error = -sk->sk_err;
182 goto out;
183 }
184 break;
185 case SS_UNCONNECTED:
186 addr = (struct sockaddr_atmsvc *) sockaddr;
187 if (addr->sas_family != AF_ATMSVC) {
188 error = -EAFNOSUPPORT;
189 goto out;
190 }
191 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
192 error = -EBADFD;
193 goto out;
194 }
195 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
196 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
197 error = -EINVAL;
198 goto out;
199 }
200 if (!vcc->qos.txtp.traffic_class &&
201 !vcc->qos.rxtp.traffic_class) {
202 error = -EINVAL;
203 goto out;
204 }
205 vcc->remote = *addr;
206 set_bit(ATM_VF_WAITING, &vcc->flags);
207 sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote);
208 if (flags & O_NONBLOCK) {
209 sock->state = SS_CONNECTING;
210 error = -EINPROGRESS;
211 goto out;
212 }
213 error = 0;
214 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
215 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
216 schedule();
217 if (!signal_pending(current)) {
218 prepare_to_wait(sk_sleep(sk), &wait,
219 TASK_INTERRUPTIBLE);
220 continue;
221 }
222 pr_debug("*ABORT*\n");
223 /*
224 * This is tricky:
225 * Kernel ---close--> Demon
226 * Kernel <--close--- Demon
227 * or
228 * Kernel ---close--> Demon
229 * Kernel <--error--- Demon
230 * or
231 * Kernel ---close--> Demon
232 * Kernel <--okay---- Demon
233 * Kernel <--close--- Demon
234 */
235 sigd_enq(vcc, as_close, NULL, NULL, NULL);
236 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
237 prepare_to_wait(sk_sleep(sk), &wait,
238 TASK_INTERRUPTIBLE);
239 schedule();
240 }
241 if (!sk->sk_err)
242 while (!test_bit(ATM_VF_RELEASED, &vcc->flags) &&
243 sigd) {
244 prepare_to_wait(sk_sleep(sk), &wait,
245 TASK_INTERRUPTIBLE);
246 schedule();
247 }
248 clear_bit(ATM_VF_REGIS, &vcc->flags);
249 clear_bit(ATM_VF_RELEASED, &vcc->flags);
250 clear_bit(ATM_VF_CLOSE, &vcc->flags);
251 /* we're gone now but may connect later */
252 error = -EINTR;
253 break;
254 }
255 finish_wait(sk_sleep(sk), &wait);
256 if (error)
257 goto out;
258 if (!sigd) {
259 error = -EUNATCH;
260 goto out;
261 }
262 if (sk->sk_err) {
263 error = -sk->sk_err;
264 goto out;
265 }
266 }
267
268 vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
269 vcc->qos.txtp.pcr = 0;
270 vcc->qos.txtp.min_pcr = 0;
271
272 error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci);
273 if (!error)
274 sock->state = SS_CONNECTED;
275 else
276 (void)svc_disconnect(vcc);
277out:
278 release_sock(sk);
279 return error;
280}
281
282static int svc_listen(struct socket *sock, int backlog)
283{
284 DEFINE_WAIT(wait);
285 struct sock *sk = sock->sk;
286 struct atm_vcc *vcc = ATM_SD(sock);
287 int error;
288
289 pr_debug("%p\n", vcc);
290 lock_sock(sk);
291 /* let server handle listen on unbound sockets */
292 if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
293 error = -EINVAL;
294 goto out;
295 }
296 if (test_bit(ATM_VF_LISTEN, &vcc->flags)) {
297 error = -EADDRINUSE;
298 goto out;
299 }
300 set_bit(ATM_VF_WAITING, &vcc->flags);
301 sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local);
302 for (;;) {
303 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
304 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
305 break;
306 schedule();
307 }
308 finish_wait(sk_sleep(sk), &wait);
309 if (!sigd) {
310 error = -EUNATCH;
311 goto out;
312 }
313 set_bit(ATM_VF_LISTEN, &vcc->flags);
314 vcc_insert_socket(sk);
315 sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
316 error = -sk->sk_err;
317out:
318 release_sock(sk);
319 return error;
320}
321
322static int svc_accept(struct socket *sock, struct socket *newsock, int flags,
323 bool kern)
324{
325 struct sock *sk = sock->sk;
326 struct sk_buff *skb;
327 struct atmsvc_msg *msg;
328 struct atm_vcc *old_vcc = ATM_SD(sock);
329 struct atm_vcc *new_vcc;
330 int error;
331
332 lock_sock(sk);
333
334 error = svc_create(sock_net(sk), newsock, 0, kern);
335 if (error)
336 goto out;
337
338 new_vcc = ATM_SD(newsock);
339
340 pr_debug("%p -> %p\n", old_vcc, new_vcc);
341 while (1) {
342 DEFINE_WAIT(wait);
343
344 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
345 while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
346 sigd) {
347 if (test_bit(ATM_VF_RELEASED, &old_vcc->flags))
348 break;
349 if (test_bit(ATM_VF_CLOSE, &old_vcc->flags)) {
350 error = -sk->sk_err;
351 break;
352 }
353 if (flags & O_NONBLOCK) {
354 error = -EAGAIN;
355 break;
356 }
357 release_sock(sk);
358 schedule();
359 lock_sock(sk);
360 if (signal_pending(current)) {
361 error = -ERESTARTSYS;
362 break;
363 }
364 prepare_to_wait(sk_sleep(sk), &wait,
365 TASK_INTERRUPTIBLE);
366 }
367 finish_wait(sk_sleep(sk), &wait);
368 if (error)
369 goto out;
370 if (!skb) {
371 error = -EUNATCH;
372 goto out;
373 }
374 msg = (struct atmsvc_msg *)skb->data;
375 new_vcc->qos = msg->qos;
376 set_bit(ATM_VF_HASQOS, &new_vcc->flags);
377 new_vcc->remote = msg->svc;
378 new_vcc->local = msg->local;
379 new_vcc->sap = msg->sap;
380 error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
381 msg->pvc.sap_addr.vpi,
382 msg->pvc.sap_addr.vci);
383 dev_kfree_skb(skb);
384 sk_acceptq_removed(sk);
385 if (error) {
386 sigd_enq2(NULL, as_reject, old_vcc, NULL, NULL,
387 &old_vcc->qos, error);
388 error = error == -EAGAIN ? -EBUSY : error;
389 goto out;
390 }
391 /* wait should be short, so we ignore the non-blocking flag */
392 set_bit(ATM_VF_WAITING, &new_vcc->flags);
393 sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL);
394 for (;;) {
395 prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
396 TASK_UNINTERRUPTIBLE);
397 if (!test_bit(ATM_VF_WAITING, &new_vcc->flags) || !sigd)
398 break;
399 release_sock(sk);
400 schedule();
401 lock_sock(sk);
402 }
403 finish_wait(sk_sleep(sk_atm(new_vcc)), &wait);
404 if (!sigd) {
405 error = -EUNATCH;
406 goto out;
407 }
408 if (!sk_atm(new_vcc)->sk_err)
409 break;
410 if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
411 error = -sk_atm(new_vcc)->sk_err;
412 goto out;
413 }
414 }
415 newsock->state = SS_CONNECTED;
416out:
417 release_sock(sk);
418 return error;
419}
420
421static int svc_getname(struct socket *sock, struct sockaddr *sockaddr,
422 int peer)
423{
424 struct sockaddr_atmsvc *addr;
425
426 addr = (struct sockaddr_atmsvc *) sockaddr;
427 memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
428 sizeof(struct sockaddr_atmsvc));
429 return sizeof(struct sockaddr_atmsvc);
430}
431
432int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
433{
434 struct sock *sk = sk_atm(vcc);
435 DEFINE_WAIT(wait);
436
437 set_bit(ATM_VF_WAITING, &vcc->flags);
438 sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0);
439 for (;;) {
440 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
441 if (!test_bit(ATM_VF_WAITING, &vcc->flags) ||
442 test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd) {
443 break;
444 }
445 schedule();
446 }
447 finish_wait(sk_sleep(sk), &wait);
448 if (!sigd)
449 return -EUNATCH;
450 return -sk->sk_err;
451}
452
453static int svc_setsockopt(struct socket *sock, int level, int optname,
454 sockptr_t optval, unsigned int optlen)
455{
456 struct sock *sk = sock->sk;
457 struct atm_vcc *vcc = ATM_SD(sock);
458 int value, error = 0;
459
460 lock_sock(sk);
461 switch (optname) {
462 case SO_ATMSAP:
463 if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
464 error = -EINVAL;
465 goto out;
466 }
467 if (copy_from_sockptr(&vcc->sap, optval, optlen)) {
468 error = -EFAULT;
469 goto out;
470 }
471 set_bit(ATM_VF_HASSAP, &vcc->flags);
472 break;
473 case SO_MULTIPOINT:
474 if (level != SOL_ATM || optlen != sizeof(int)) {
475 error = -EINVAL;
476 goto out;
477 }
478 if (copy_from_sockptr(&value, optval, sizeof(int))) {
479 error = -EFAULT;
480 goto out;
481 }
482 if (value == 1)
483 set_bit(ATM_VF_SESSION, &vcc->flags);
484 else if (value == 0)
485 clear_bit(ATM_VF_SESSION, &vcc->flags);
486 else
487 error = -EINVAL;
488 break;
489 default:
490 error = vcc_setsockopt(sock, level, optname, optval, optlen);
491 }
492
493out:
494 release_sock(sk);
495 return error;
496}
497
498static int svc_getsockopt(struct socket *sock, int level, int optname,
499 char __user *optval, int __user *optlen)
500{
501 struct sock *sk = sock->sk;
502 int error = 0, len;
503
504 lock_sock(sk);
505 if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
506 error = vcc_getsockopt(sock, level, optname, optval, optlen);
507 goto out;
508 }
509 if (get_user(len, optlen)) {
510 error = -EFAULT;
511 goto out;
512 }
513 if (len != sizeof(struct atm_sap)) {
514 error = -EINVAL;
515 goto out;
516 }
517 if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
518 error = -EFAULT;
519 goto out;
520 }
521out:
522 release_sock(sk);
523 return error;
524}
525
526static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
527 int sockaddr_len, int flags)
528{
529 DEFINE_WAIT(wait);
530 struct sock *sk = sock->sk;
531 struct atm_vcc *vcc = ATM_SD(sock);
532 int error;
533
534 lock_sock(sk);
535 set_bit(ATM_VF_WAITING, &vcc->flags);
536 sigd_enq(vcc, as_addparty, NULL, NULL,
537 (struct sockaddr_atmsvc *) sockaddr);
538 if (flags & O_NONBLOCK) {
539 error = -EINPROGRESS;
540 goto out;
541 }
542 pr_debug("added wait queue\n");
543 for (;;) {
544 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
545 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
546 break;
547 schedule();
548 }
549 finish_wait(sk_sleep(sk), &wait);
550 error = -xchg(&sk->sk_err_soft, 0);
551out:
552 release_sock(sk);
553 return error;
554}
555
556static int svc_dropparty(struct socket *sock, int ep_ref)
557{
558 DEFINE_WAIT(wait);
559 struct sock *sk = sock->sk;
560 struct atm_vcc *vcc = ATM_SD(sock);
561 int error;
562
563 lock_sock(sk);
564 set_bit(ATM_VF_WAITING, &vcc->flags);
565 sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
566 for (;;) {
567 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
568 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
569 break;
570 schedule();
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 /* The definition of ATM_ADDPARTY uses the size of struct atm_iobuf.
617 But actually it takes a struct sockaddr_atmsvc, which doesn't need
618 compat handling. So all we have to do is fix up cmd... */
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 /* CONFIG_COMPAT */
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 .gettstamp = sock_gettstamp,
645 .listen = svc_listen,
646 .shutdown = svc_shutdown,
647 .setsockopt = svc_setsockopt,
648 .getsockopt = svc_getsockopt,
649 .sendmsg = vcc_sendmsg,
650 .recvmsg = vcc_recvmsg,
651 .mmap = sock_no_mmap,
652 .sendpage = sock_no_sendpage,
653};
654
655
656static int svc_create(struct net *net, struct socket *sock, int protocol,
657 int kern)
658{
659 int error;
660
661 if (!net_eq(net, &init_net))
662 return -EAFNOSUPPORT;
663
664 sock->ops = &svc_proto_ops;
665 error = vcc_create(net, sock, protocol, AF_ATMSVC, kern);
666 if (error)
667 return error;
668 ATM_SD(sock)->local.sas_family = AF_ATMSVC;
669 ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
670 return 0;
671}
672
673static const struct net_proto_family svc_family_ops = {
674 .family = PF_ATMSVC,
675 .create = svc_create,
676 .owner = THIS_MODULE,
677};
678
679
680/*
681 * Initialize the ATM SVC protocol family
682 */
683
684int __init atmsvc_init(void)
685{
686 return sock_register(&svc_family_ops);
687}
688
689void atmsvc_exit(void)
690{
691 sock_unregister(PF_ATMSVC);
692}
1/* net/atm/svc.c - ATM SVC sockets */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
6
7#include <linux/string.h>
8#include <linux/net.h> /* struct socket, struct proto_ops */
9#include <linux/errno.h> /* error codes */
10#include <linux/kernel.h> /* printk */
11#include <linux/skbuff.h>
12#include <linux/wait.h>
13#include <linux/sched.h> /* jiffies and HZ */
14#include <linux/fcntl.h> /* O_NONBLOCK */
15#include <linux/init.h>
16#include <linux/atm.h> /* ATM stuff */
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> /* for sock_no_* */
22#include <linux/uaccess.h>
23#include <linux/export.h>
24
25#include "resources.h"
26#include "common.h" /* common for PVCs and SVCs */
27#include "signaling.h"
28#include "addr.h"
29
30static int svc_create(struct net *net, struct socket *sock, int protocol,
31 int kern);
32
33/*
34 * Note: since all this is still nicely synchronized with the signaling demon,
35 * there's no need to protect sleep loops with clis. If signaling is
36 * moved into the kernel, that would change.
37 */
38
39
40static int svc_shutdown(struct socket *sock, int how)
41{
42 return 0;
43}
44
45static void svc_disconnect(struct atm_vcc *vcc)
46{
47 DEFINE_WAIT(wait);
48 struct sk_buff *skb;
49 struct sock *sk = sk_atm(vcc);
50
51 pr_debug("%p\n", vcc);
52 if (test_bit(ATM_VF_REGIS, &vcc->flags)) {
53 sigd_enq(vcc, as_close, NULL, NULL, NULL);
54 for (;;) {
55 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
56 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd)
57 break;
58 schedule();
59 }
60 finish_wait(sk_sleep(sk), &wait);
61 }
62 /* beware - socket is still in use by atmsigd until the last
63 as_indicate has been answered */
64 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
65 atm_return(vcc, skb->truesize);
66 pr_debug("LISTEN REL\n");
67 sigd_enq2(NULL, as_reject, vcc, NULL, NULL, &vcc->qos, 0);
68 dev_kfree_skb(skb);
69 }
70 clear_bit(ATM_VF_REGIS, &vcc->flags);
71 /* ... may retry later */
72}
73
74static int svc_release(struct socket *sock)
75{
76 struct sock *sk = sock->sk;
77 struct atm_vcc *vcc;
78
79 if (sk) {
80 vcc = ATM_SD(sock);
81 pr_debug("%p\n", vcc);
82 clear_bit(ATM_VF_READY, &vcc->flags);
83 /*
84 * VCC pointer is used as a reference,
85 * so we must not free it (thereby subjecting it to re-use)
86 * before all pending connections are closed
87 */
88 svc_disconnect(vcc);
89 vcc_release(sock);
90 }
91 return 0;
92}
93
94static int svc_bind(struct socket *sock, struct sockaddr *sockaddr,
95 int sockaddr_len)
96{
97 DEFINE_WAIT(wait);
98 struct sock *sk = sock->sk;
99 struct sockaddr_atmsvc *addr;
100 struct atm_vcc *vcc;
101 int error;
102
103 if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
104 return -EINVAL;
105 lock_sock(sk);
106 if (sock->state == SS_CONNECTED) {
107 error = -EISCONN;
108 goto out;
109 }
110 if (sock->state != SS_UNCONNECTED) {
111 error = -EINVAL;
112 goto out;
113 }
114 vcc = ATM_SD(sock);
115 addr = (struct sockaddr_atmsvc *) sockaddr;
116 if (addr->sas_family != AF_ATMSVC) {
117 error = -EAFNOSUPPORT;
118 goto out;
119 }
120 clear_bit(ATM_VF_BOUND, &vcc->flags);
121 /* failing rebind will kill old binding */
122 /* @@@ check memory (de)allocation on rebind */
123 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
124 error = -EBADFD;
125 goto out;
126 }
127 vcc->local = *addr;
128 set_bit(ATM_VF_WAITING, &vcc->flags);
129 sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local);
130 for (;;) {
131 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
132 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
133 break;
134 schedule();
135 }
136 finish_wait(sk_sleep(sk), &wait);
137 clear_bit(ATM_VF_REGIS, &vcc->flags); /* doesn't count */
138 if (!sigd) {
139 error = -EUNATCH;
140 goto out;
141 }
142 if (!sk->sk_err)
143 set_bit(ATM_VF_BOUND, &vcc->flags);
144 error = -sk->sk_err;
145out:
146 release_sock(sk);
147 return error;
148}
149
150static int svc_connect(struct socket *sock, struct sockaddr *sockaddr,
151 int sockaddr_len, int flags)
152{
153 DEFINE_WAIT(wait);
154 struct sock *sk = sock->sk;
155 struct sockaddr_atmsvc *addr;
156 struct atm_vcc *vcc = ATM_SD(sock);
157 int error;
158
159 pr_debug("%p\n", vcc);
160 lock_sock(sk);
161 if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
162 error = -EINVAL;
163 goto out;
164 }
165
166 switch (sock->state) {
167 default:
168 error = -EINVAL;
169 goto out;
170 case SS_CONNECTED:
171 error = -EISCONN;
172 goto out;
173 case SS_CONNECTING:
174 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
175 error = -EALREADY;
176 goto out;
177 }
178 sock->state = SS_UNCONNECTED;
179 if (sk->sk_err) {
180 error = -sk->sk_err;
181 goto out;
182 }
183 break;
184 case SS_UNCONNECTED:
185 addr = (struct sockaddr_atmsvc *) sockaddr;
186 if (addr->sas_family != AF_ATMSVC) {
187 error = -EAFNOSUPPORT;
188 goto out;
189 }
190 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
191 error = -EBADFD;
192 goto out;
193 }
194 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
195 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
196 error = -EINVAL;
197 goto out;
198 }
199 if (!vcc->qos.txtp.traffic_class &&
200 !vcc->qos.rxtp.traffic_class) {
201 error = -EINVAL;
202 goto out;
203 }
204 vcc->remote = *addr;
205 set_bit(ATM_VF_WAITING, &vcc->flags);
206 sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote);
207 if (flags & O_NONBLOCK) {
208 sock->state = SS_CONNECTING;
209 error = -EINPROGRESS;
210 goto out;
211 }
212 error = 0;
213 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
214 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
215 schedule();
216 if (!signal_pending(current)) {
217 prepare_to_wait(sk_sleep(sk), &wait,
218 TASK_INTERRUPTIBLE);
219 continue;
220 }
221 pr_debug("*ABORT*\n");
222 /*
223 * This is tricky:
224 * Kernel ---close--> Demon
225 * Kernel <--close--- Demon
226 * or
227 * Kernel ---close--> Demon
228 * Kernel <--error--- Demon
229 * or
230 * Kernel ---close--> Demon
231 * Kernel <--okay---- Demon
232 * Kernel <--close--- Demon
233 */
234 sigd_enq(vcc, as_close, NULL, NULL, NULL);
235 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
236 prepare_to_wait(sk_sleep(sk), &wait,
237 TASK_INTERRUPTIBLE);
238 schedule();
239 }
240 if (!sk->sk_err)
241 while (!test_bit(ATM_VF_RELEASED, &vcc->flags) &&
242 sigd) {
243 prepare_to_wait(sk_sleep(sk), &wait,
244 TASK_INTERRUPTIBLE);
245 schedule();
246 }
247 clear_bit(ATM_VF_REGIS, &vcc->flags);
248 clear_bit(ATM_VF_RELEASED, &vcc->flags);
249 clear_bit(ATM_VF_CLOSE, &vcc->flags);
250 /* we're gone now but may connect later */
251 error = -EINTR;
252 break;
253 }
254 finish_wait(sk_sleep(sk), &wait);
255 if (error)
256 goto out;
257 if (!sigd) {
258 error = -EUNATCH;
259 goto out;
260 }
261 if (sk->sk_err) {
262 error = -sk->sk_err;
263 goto out;
264 }
265 }
266
267 vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
268 vcc->qos.txtp.pcr = 0;
269 vcc->qos.txtp.min_pcr = 0;
270
271 error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci);
272 if (!error)
273 sock->state = SS_CONNECTED;
274 else
275 (void)svc_disconnect(vcc);
276out:
277 release_sock(sk);
278 return error;
279}
280
281static int svc_listen(struct socket *sock, int backlog)
282{
283 DEFINE_WAIT(wait);
284 struct sock *sk = sock->sk;
285 struct atm_vcc *vcc = ATM_SD(sock);
286 int error;
287
288 pr_debug("%p\n", vcc);
289 lock_sock(sk);
290 /* let server handle listen on unbound sockets */
291 if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
292 error = -EINVAL;
293 goto out;
294 }
295 if (test_bit(ATM_VF_LISTEN, &vcc->flags)) {
296 error = -EADDRINUSE;
297 goto out;
298 }
299 set_bit(ATM_VF_WAITING, &vcc->flags);
300 sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local);
301 for (;;) {
302 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
303 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
304 break;
305 schedule();
306 }
307 finish_wait(sk_sleep(sk), &wait);
308 if (!sigd) {
309 error = -EUNATCH;
310 goto out;
311 }
312 set_bit(ATM_VF_LISTEN, &vcc->flags);
313 vcc_insert_socket(sk);
314 sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
315 error = -sk->sk_err;
316out:
317 release_sock(sk);
318 return error;
319}
320
321static int svc_accept(struct socket *sock, struct socket *newsock, int flags)
322{
323 struct sock *sk = sock->sk;
324 struct sk_buff *skb;
325 struct atmsvc_msg *msg;
326 struct atm_vcc *old_vcc = ATM_SD(sock);
327 struct atm_vcc *new_vcc;
328 int error;
329
330 lock_sock(sk);
331
332 error = svc_create(sock_net(sk), newsock, 0, 0);
333 if (error)
334 goto out;
335
336 new_vcc = ATM_SD(newsock);
337
338 pr_debug("%p -> %p\n", old_vcc, new_vcc);
339 while (1) {
340 DEFINE_WAIT(wait);
341
342 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
343 while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
344 sigd) {
345 if (test_bit(ATM_VF_RELEASED, &old_vcc->flags))
346 break;
347 if (test_bit(ATM_VF_CLOSE, &old_vcc->flags)) {
348 error = -sk->sk_err;
349 break;
350 }
351 if (flags & O_NONBLOCK) {
352 error = -EAGAIN;
353 break;
354 }
355 release_sock(sk);
356 schedule();
357 lock_sock(sk);
358 if (signal_pending(current)) {
359 error = -ERESTARTSYS;
360 break;
361 }
362 prepare_to_wait(sk_sleep(sk), &wait,
363 TASK_INTERRUPTIBLE);
364 }
365 finish_wait(sk_sleep(sk), &wait);
366 if (error)
367 goto out;
368 if (!skb) {
369 error = -EUNATCH;
370 goto out;
371 }
372 msg = (struct atmsvc_msg *)skb->data;
373 new_vcc->qos = msg->qos;
374 set_bit(ATM_VF_HASQOS, &new_vcc->flags);
375 new_vcc->remote = msg->svc;
376 new_vcc->local = msg->local;
377 new_vcc->sap = msg->sap;
378 error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
379 msg->pvc.sap_addr.vpi,
380 msg->pvc.sap_addr.vci);
381 dev_kfree_skb(skb);
382 sk->sk_ack_backlog--;
383 if (error) {
384 sigd_enq2(NULL, as_reject, old_vcc, NULL, NULL,
385 &old_vcc->qos, error);
386 error = error == -EAGAIN ? -EBUSY : error;
387 goto out;
388 }
389 /* wait should be short, so we ignore the non-blocking flag */
390 set_bit(ATM_VF_WAITING, &new_vcc->flags);
391 sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL);
392 for (;;) {
393 prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
394 TASK_UNINTERRUPTIBLE);
395 if (!test_bit(ATM_VF_WAITING, &new_vcc->flags) || !sigd)
396 break;
397 release_sock(sk);
398 schedule();
399 lock_sock(sk);
400 }
401 finish_wait(sk_sleep(sk_atm(new_vcc)), &wait);
402 if (!sigd) {
403 error = -EUNATCH;
404 goto out;
405 }
406 if (!sk_atm(new_vcc)->sk_err)
407 break;
408 if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
409 error = -sk_atm(new_vcc)->sk_err;
410 goto out;
411 }
412 }
413 newsock->state = SS_CONNECTED;
414out:
415 release_sock(sk);
416 return error;
417}
418
419static int svc_getname(struct socket *sock, struct sockaddr *sockaddr,
420 int *sockaddr_len, int peer)
421{
422 struct sockaddr_atmsvc *addr;
423
424 *sockaddr_len = sizeof(struct sockaddr_atmsvc);
425 addr = (struct sockaddr_atmsvc *) sockaddr;
426 memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
427 sizeof(struct sockaddr_atmsvc));
428 return 0;
429}
430
431int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
432{
433 struct sock *sk = sk_atm(vcc);
434 DEFINE_WAIT(wait);
435
436 set_bit(ATM_VF_WAITING, &vcc->flags);
437 sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0);
438 for (;;) {
439 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
440 if (!test_bit(ATM_VF_WAITING, &vcc->flags) ||
441 test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd) {
442 break;
443 }
444 schedule();
445 }
446 finish_wait(sk_sleep(sk), &wait);
447 if (!sigd)
448 return -EUNATCH;
449 return -sk->sk_err;
450}
451
452static int svc_setsockopt(struct socket *sock, int level, int optname,
453 char __user *optval, unsigned int optlen)
454{
455 struct sock *sk = sock->sk;
456 struct atm_vcc *vcc = ATM_SD(sock);
457 int value, error = 0;
458
459 lock_sock(sk);
460 switch (optname) {
461 case SO_ATMSAP:
462 if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
463 error = -EINVAL;
464 goto out;
465 }
466 if (copy_from_user(&vcc->sap, optval, optlen)) {
467 error = -EFAULT;
468 goto out;
469 }
470 set_bit(ATM_VF_HASSAP, &vcc->flags);
471 break;
472 case SO_MULTIPOINT:
473 if (level != SOL_ATM || optlen != sizeof(int)) {
474 error = -EINVAL;
475 goto out;
476 }
477 if (get_user(value, (int __user *)optval)) {
478 error = -EFAULT;
479 goto out;
480 }
481 if (value == 1)
482 set_bit(ATM_VF_SESSION, &vcc->flags);
483 else if (value == 0)
484 clear_bit(ATM_VF_SESSION, &vcc->flags);
485 else
486 error = -EINVAL;
487 break;
488 default:
489 error = vcc_setsockopt(sock, level, optname, optval, optlen);
490 }
491
492out:
493 release_sock(sk);
494 return error;
495}
496
497static int svc_getsockopt(struct socket *sock, int level, int optname,
498 char __user *optval, int __user *optlen)
499{
500 struct sock *sk = sock->sk;
501 int error = 0, len;
502
503 lock_sock(sk);
504 if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
505 error = vcc_getsockopt(sock, level, optname, optval, optlen);
506 goto out;
507 }
508 if (get_user(len, optlen)) {
509 error = -EFAULT;
510 goto out;
511 }
512 if (len != sizeof(struct atm_sap)) {
513 error = -EINVAL;
514 goto out;
515 }
516 if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
517 error = -EFAULT;
518 goto out;
519 }
520out:
521 release_sock(sk);
522 return error;
523}
524
525static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
526 int sockaddr_len, int flags)
527{
528 DEFINE_WAIT(wait);
529 struct sock *sk = sock->sk;
530 struct atm_vcc *vcc = ATM_SD(sock);
531 int error;
532
533 lock_sock(sk);
534 set_bit(ATM_VF_WAITING, &vcc->flags);
535 sigd_enq(vcc, as_addparty, NULL, NULL,
536 (struct sockaddr_atmsvc *) sockaddr);
537 if (flags & O_NONBLOCK) {
538 error = -EINPROGRESS;
539 goto out;
540 }
541 pr_debug("added wait queue\n");
542 for (;;) {
543 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
544 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
545 break;
546 schedule();
547 }
548 finish_wait(sk_sleep(sk), &wait);
549 error = xchg(&sk->sk_err_soft, 0);
550out:
551 release_sock(sk);
552 return error;
553}
554
555static int svc_dropparty(struct socket *sock, int ep_ref)
556{
557 DEFINE_WAIT(wait);
558 struct sock *sk = sock->sk;
559 struct atm_vcc *vcc = ATM_SD(sock);
560 int error;
561
562 lock_sock(sk);
563 set_bit(ATM_VF_WAITING, &vcc->flags);
564 sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
565 for (;;) {
566 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
567 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
568 break;
569 schedule();
570 }
571 finish_wait(sk_sleep(sk), &wait);
572 if (!sigd) {
573 error = -EUNATCH;
574 goto out;
575 }
576 error = xchg(&sk->sk_err_soft, 0);
577out:
578 release_sock(sk);
579 return error;
580}
581
582static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
583{
584 int error, ep_ref;
585 struct sockaddr_atmsvc sa;
586 struct atm_vcc *vcc = ATM_SD(sock);
587
588 switch (cmd) {
589 case ATM_ADDPARTY:
590 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
591 return -EINVAL;
592 if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
593 return -EFAULT;
594 error = svc_addparty(sock, (struct sockaddr *)&sa, sizeof(sa),
595 0);
596 break;
597 case ATM_DROPPARTY:
598 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
599 return -EINVAL;
600 if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
601 return -EFAULT;
602 error = svc_dropparty(sock, ep_ref);
603 break;
604 default:
605 error = vcc_ioctl(sock, cmd, arg);
606 }
607
608 return error;
609}
610
611#ifdef CONFIG_COMPAT
612static int svc_compat_ioctl(struct socket *sock, unsigned int cmd,
613 unsigned long arg)
614{
615 /* The definition of ATM_ADDPARTY uses the size of struct atm_iobuf.
616 But actually it takes a struct sockaddr_atmsvc, which doesn't need
617 compat handling. So all we have to do is fix up cmd... */
618 if (cmd == COMPAT_ATM_ADDPARTY)
619 cmd = ATM_ADDPARTY;
620
621 if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY)
622 return svc_ioctl(sock, cmd, arg);
623 else
624 return vcc_compat_ioctl(sock, cmd, arg);
625}
626#endif /* CONFIG_COMPAT */
627
628static const struct proto_ops svc_proto_ops = {
629 .family = PF_ATMSVC,
630 .owner = THIS_MODULE,
631
632 .release = svc_release,
633 .bind = svc_bind,
634 .connect = svc_connect,
635 .socketpair = sock_no_socketpair,
636 .accept = svc_accept,
637 .getname = svc_getname,
638 .poll = vcc_poll,
639 .ioctl = svc_ioctl,
640#ifdef CONFIG_COMPAT
641 .compat_ioctl = svc_compat_ioctl,
642#endif
643 .listen = svc_listen,
644 .shutdown = svc_shutdown,
645 .setsockopt = svc_setsockopt,
646 .getsockopt = svc_getsockopt,
647 .sendmsg = vcc_sendmsg,
648 .recvmsg = vcc_recvmsg,
649 .mmap = sock_no_mmap,
650 .sendpage = sock_no_sendpage,
651};
652
653
654static int svc_create(struct net *net, struct socket *sock, int protocol,
655 int kern)
656{
657 int error;
658
659 if (!net_eq(net, &init_net))
660 return -EAFNOSUPPORT;
661
662 sock->ops = &svc_proto_ops;
663 error = vcc_create(net, sock, protocol, AF_ATMSVC, kern);
664 if (error)
665 return error;
666 ATM_SD(sock)->local.sas_family = AF_ATMSVC;
667 ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
668 return 0;
669}
670
671static const struct net_proto_family svc_family_ops = {
672 .family = PF_ATMSVC,
673 .create = svc_create,
674 .owner = THIS_MODULE,
675};
676
677
678/*
679 * Initialize the ATM SVC protocol family
680 */
681
682int __init atmsvc_init(void)
683{
684 return sock_register(&svc_family_ops);
685}
686
687void atmsvc_exit(void)
688{
689 sock_unregister(PF_ATMSVC);
690}