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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 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
54 sigd_enq(vcc, as_close, NULL, NULL, NULL);
55 while (!test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) {
56 schedule();
57 prepare_to_wait(sk_sleep(sk), &wait,
58 TASK_UNINTERRUPTIBLE);
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 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
130 sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local);
131 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
132 schedule();
133 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
134 }
135 finish_wait(sk_sleep(sk), &wait);
136 clear_bit(ATM_VF_REGIS, &vcc->flags); /* doesn't count */
137 if (!sigd) {
138 error = -EUNATCH;
139 goto out;
140 }
141 if (!sk->sk_err)
142 set_bit(ATM_VF_BOUND, &vcc->flags);
143 error = -sk->sk_err;
144out:
145 release_sock(sk);
146 return error;
147}
148
149static int svc_connect(struct socket *sock, struct sockaddr *sockaddr,
150 int sockaddr_len, int flags)
151{
152 DEFINE_WAIT(wait);
153 struct sock *sk = sock->sk;
154 struct sockaddr_atmsvc *addr;
155 struct atm_vcc *vcc = ATM_SD(sock);
156 int error;
157
158 pr_debug("%p\n", vcc);
159 lock_sock(sk);
160 if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
161 error = -EINVAL;
162 goto out;
163 }
164
165 switch (sock->state) {
166 default:
167 error = -EINVAL;
168 goto out;
169 case SS_CONNECTED:
170 error = -EISCONN;
171 goto out;
172 case SS_CONNECTING:
173 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
174 error = -EALREADY;
175 goto out;
176 }
177 sock->state = SS_UNCONNECTED;
178 if (sk->sk_err) {
179 error = -sk->sk_err;
180 goto out;
181 }
182 break;
183 case SS_UNCONNECTED:
184 addr = (struct sockaddr_atmsvc *) sockaddr;
185 if (addr->sas_family != AF_ATMSVC) {
186 error = -EAFNOSUPPORT;
187 goto out;
188 }
189 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
190 error = -EBADFD;
191 goto out;
192 }
193 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
194 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
195 error = -EINVAL;
196 goto out;
197 }
198 if (!vcc->qos.txtp.traffic_class &&
199 !vcc->qos.rxtp.traffic_class) {
200 error = -EINVAL;
201 goto out;
202 }
203 vcc->remote = *addr;
204 set_bit(ATM_VF_WAITING, &vcc->flags);
205 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
206 sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote);
207 if (flags & O_NONBLOCK) {
208 finish_wait(sk_sleep(sk), &wait);
209 sock->state = SS_CONNECTING;
210 error = -EINPROGRESS;
211 goto out;
212 }
213 error = 0;
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 * Not supported yet
268 *
269 * #ifndef CONFIG_SINGLE_SIGITF
270 */
271 vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
272 vcc->qos.txtp.pcr = 0;
273 vcc->qos.txtp.min_pcr = 0;
274/*
275 * #endif
276 */
277 error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci);
278 if (!error)
279 sock->state = SS_CONNECTED;
280 else
281 (void)svc_disconnect(vcc);
282out:
283 release_sock(sk);
284 return error;
285}
286
287static int svc_listen(struct socket *sock, int backlog)
288{
289 DEFINE_WAIT(wait);
290 struct sock *sk = sock->sk;
291 struct atm_vcc *vcc = ATM_SD(sock);
292 int error;
293
294 pr_debug("%p\n", vcc);
295 lock_sock(sk);
296 /* let server handle listen on unbound sockets */
297 if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
298 error = -EINVAL;
299 goto out;
300 }
301 if (test_bit(ATM_VF_LISTEN, &vcc->flags)) {
302 error = -EADDRINUSE;
303 goto out;
304 }
305 set_bit(ATM_VF_WAITING, &vcc->flags);
306 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
307 sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local);
308 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
309 schedule();
310 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
311 }
312 finish_wait(sk_sleep(sk), &wait);
313 if (!sigd) {
314 error = -EUNATCH;
315 goto out;
316 }
317 set_bit(ATM_VF_LISTEN, &vcc->flags);
318 vcc_insert_socket(sk);
319 sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
320 error = -sk->sk_err;
321out:
322 release_sock(sk);
323 return error;
324}
325
326static int svc_accept(struct socket *sock, struct socket *newsock, int flags)
327{
328 struct sock *sk = sock->sk;
329 struct sk_buff *skb;
330 struct atmsvc_msg *msg;
331 struct atm_vcc *old_vcc = ATM_SD(sock);
332 struct atm_vcc *new_vcc;
333 int error;
334
335 lock_sock(sk);
336
337 error = svc_create(sock_net(sk), newsock, 0, 0);
338 if (error)
339 goto out;
340
341 new_vcc = ATM_SD(newsock);
342
343 pr_debug("%p -> %p\n", old_vcc, new_vcc);
344 while (1) {
345 DEFINE_WAIT(wait);
346
347 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
348 while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
349 sigd) {
350 if (test_bit(ATM_VF_RELEASED, &old_vcc->flags))
351 break;
352 if (test_bit(ATM_VF_CLOSE, &old_vcc->flags)) {
353 error = -sk->sk_err;
354 break;
355 }
356 if (flags & O_NONBLOCK) {
357 error = -EAGAIN;
358 break;
359 }
360 release_sock(sk);
361 schedule();
362 lock_sock(sk);
363 if (signal_pending(current)) {
364 error = -ERESTARTSYS;
365 break;
366 }
367 prepare_to_wait(sk_sleep(sk), &wait,
368 TASK_INTERRUPTIBLE);
369 }
370 finish_wait(sk_sleep(sk), &wait);
371 if (error)
372 goto out;
373 if (!skb) {
374 error = -EUNATCH;
375 goto out;
376 }
377 msg = (struct atmsvc_msg *)skb->data;
378 new_vcc->qos = msg->qos;
379 set_bit(ATM_VF_HASQOS, &new_vcc->flags);
380 new_vcc->remote = msg->svc;
381 new_vcc->local = msg->local;
382 new_vcc->sap = msg->sap;
383 error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
384 msg->pvc.sap_addr.vpi,
385 msg->pvc.sap_addr.vci);
386 dev_kfree_skb(skb);
387 sk->sk_ack_backlog--;
388 if (error) {
389 sigd_enq2(NULL, as_reject, old_vcc, NULL, NULL,
390 &old_vcc->qos, error);
391 error = error == -EAGAIN ? -EBUSY : error;
392 goto out;
393 }
394 /* wait should be short, so we ignore the non-blocking flag */
395 set_bit(ATM_VF_WAITING, &new_vcc->flags);
396 prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
397 TASK_UNINTERRUPTIBLE);
398 sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL);
399 while (test_bit(ATM_VF_WAITING, &new_vcc->flags) && sigd) {
400 release_sock(sk);
401 schedule();
402 lock_sock(sk);
403 prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
404 TASK_UNINTERRUPTIBLE);
405 }
406 finish_wait(sk_sleep(sk_atm(new_vcc)), &wait);
407 if (!sigd) {
408 error = -EUNATCH;
409 goto out;
410 }
411 if (!sk_atm(new_vcc)->sk_err)
412 break;
413 if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
414 error = -sk_atm(new_vcc)->sk_err;
415 goto out;
416 }
417 }
418 newsock->state = SS_CONNECTED;
419out:
420 release_sock(sk);
421 return error;
422}
423
424static int svc_getname(struct socket *sock, struct sockaddr *sockaddr,
425 int *sockaddr_len, int peer)
426{
427 struct sockaddr_atmsvc *addr;
428
429 *sockaddr_len = sizeof(struct sockaddr_atmsvc);
430 addr = (struct sockaddr_atmsvc *) sockaddr;
431 memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
432 sizeof(struct sockaddr_atmsvc));
433 return 0;
434}
435
436int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
437{
438 struct sock *sk = sk_atm(vcc);
439 DEFINE_WAIT(wait);
440
441 set_bit(ATM_VF_WAITING, &vcc->flags);
442 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
443 sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0);
444 while (test_bit(ATM_VF_WAITING, &vcc->flags) &&
445 !test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) {
446 schedule();
447 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
448 }
449 finish_wait(sk_sleep(sk), &wait);
450 if (!sigd)
451 return -EUNATCH;
452 return -sk->sk_err;
453}
454
455static int svc_setsockopt(struct socket *sock, int level, int optname,
456 char __user *optval, unsigned int optlen)
457{
458 struct sock *sk = sock->sk;
459 struct atm_vcc *vcc = ATM_SD(sock);
460 int value, error = 0;
461
462 lock_sock(sk);
463 switch (optname) {
464 case SO_ATMSAP:
465 if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
466 error = -EINVAL;
467 goto out;
468 }
469 if (copy_from_user(&vcc->sap, optval, optlen)) {
470 error = -EFAULT;
471 goto out;
472 }
473 set_bit(ATM_VF_HASSAP, &vcc->flags);
474 break;
475 case SO_MULTIPOINT:
476 if (level != SOL_ATM || optlen != sizeof(int)) {
477 error = -EINVAL;
478 goto out;
479 }
480 if (get_user(value, (int __user *)optval)) {
481 error = -EFAULT;
482 goto out;
483 }
484 if (value == 1)
485 set_bit(ATM_VF_SESSION, &vcc->flags);
486 else if (value == 0)
487 clear_bit(ATM_VF_SESSION, &vcc->flags);
488 else
489 error = -EINVAL;
490 break;
491 default:
492 error = vcc_setsockopt(sock, level, optname, optval, optlen);
493 }
494
495out:
496 release_sock(sk);
497 return error;
498}
499
500static int svc_getsockopt(struct socket *sock, int level, int optname,
501 char __user *optval, int __user *optlen)
502{
503 struct sock *sk = sock->sk;
504 int error = 0, len;
505
506 lock_sock(sk);
507 if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
508 error = vcc_getsockopt(sock, level, optname, optval, optlen);
509 goto out;
510 }
511 if (get_user(len, optlen)) {
512 error = -EFAULT;
513 goto out;
514 }
515 if (len != sizeof(struct atm_sap)) {
516 error = -EINVAL;
517 goto out;
518 }
519 if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
520 error = -EFAULT;
521 goto out;
522 }
523out:
524 release_sock(sk);
525 return error;
526}
527
528static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
529 int sockaddr_len, int flags)
530{
531 DEFINE_WAIT(wait);
532 struct sock *sk = sock->sk;
533 struct atm_vcc *vcc = ATM_SD(sock);
534 int error;
535
536 lock_sock(sk);
537 set_bit(ATM_VF_WAITING, &vcc->flags);
538 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
539 sigd_enq(vcc, as_addparty, NULL, NULL,
540 (struct sockaddr_atmsvc *) sockaddr);
541 if (flags & O_NONBLOCK) {
542 finish_wait(sk_sleep(sk), &wait);
543 error = -EINPROGRESS;
544 goto out;
545 }
546 pr_debug("added wait queue\n");
547 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
548 schedule();
549 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
550 }
551 finish_wait(sk_sleep(sk), &wait);
552 error = xchg(&sk->sk_err_soft, 0);
553out:
554 release_sock(sk);
555 return error;
556}
557
558static int svc_dropparty(struct socket *sock, int ep_ref)
559{
560 DEFINE_WAIT(wait);
561 struct sock *sk = sock->sk;
562 struct atm_vcc *vcc = ATM_SD(sock);
563 int error;
564
565 lock_sock(sk);
566 set_bit(ATM_VF_WAITING, &vcc->flags);
567 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
568 sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
569 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
570 schedule();
571 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
572 }
573 finish_wait(sk_sleep(sk), &wait);
574 if (!sigd) {
575 error = -EUNATCH;
576 goto out;
577 }
578 error = xchg(&sk->sk_err_soft, 0);
579out:
580 release_sock(sk);
581 return error;
582}
583
584static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
585{
586 int error, ep_ref;
587 struct sockaddr_atmsvc sa;
588 struct atm_vcc *vcc = ATM_SD(sock);
589
590 switch (cmd) {
591 case ATM_ADDPARTY:
592 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
593 return -EINVAL;
594 if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
595 return -EFAULT;
596 error = svc_addparty(sock, (struct sockaddr *)&sa, sizeof(sa),
597 0);
598 break;
599 case ATM_DROPPARTY:
600 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
601 return -EINVAL;
602 if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
603 return -EFAULT;
604 error = svc_dropparty(sock, ep_ref);
605 break;
606 default:
607 error = vcc_ioctl(sock, cmd, arg);
608 }
609
610 return error;
611}
612
613#ifdef CONFIG_COMPAT
614static int svc_compat_ioctl(struct socket *sock, unsigned int cmd,
615 unsigned long arg)
616{
617 /* The definition of ATM_ADDPARTY uses the size of struct atm_iobuf.
618 But actually it takes a struct sockaddr_atmsvc, which doesn't need
619 compat handling. So all we have to do is fix up cmd... */
620 if (cmd == COMPAT_ATM_ADDPARTY)
621 cmd = ATM_ADDPARTY;
622
623 if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY)
624 return svc_ioctl(sock, cmd, arg);
625 else
626 return vcc_compat_ioctl(sock, cmd, arg);
627}
628#endif /* CONFIG_COMPAT */
629
630static const struct proto_ops svc_proto_ops = {
631 .family = PF_ATMSVC,
632 .owner = THIS_MODULE,
633
634 .release = svc_release,
635 .bind = svc_bind,
636 .connect = svc_connect,
637 .socketpair = sock_no_socketpair,
638 .accept = svc_accept,
639 .getname = svc_getname,
640 .poll = vcc_poll,
641 .ioctl = svc_ioctl,
642#ifdef CONFIG_COMPAT
643 .compat_ioctl = svc_compat_ioctl,
644#endif
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);
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}