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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
31#ifdef CONFIG_COMPAT
32/* It actually takes struct sockaddr_atmsvc, not struct atm_iobuf */
33#define COMPAT_ATM_ADDPARTY _IOW('a', ATMIOC_SPECIAL + 4, struct compat_atm_iobuf)
34#endif
35
36static int svc_create(struct net *net, struct socket *sock, int protocol,
37 int kern);
38
39/*
40 * Note: since all this is still nicely synchronized with the signaling demon,
41 * there's no need to protect sleep loops with clis. If signaling is
42 * moved into the kernel, that would change.
43 */
44
45
46static int svc_shutdown(struct socket *sock, int how)
47{
48 return 0;
49}
50
51static void svc_disconnect(struct atm_vcc *vcc)
52{
53 DEFINE_WAIT(wait);
54 struct sk_buff *skb;
55 struct sock *sk = sk_atm(vcc);
56
57 pr_debug("%p\n", vcc);
58 if (test_bit(ATM_VF_REGIS, &vcc->flags)) {
59 sigd_enq(vcc, as_close, NULL, NULL, NULL);
60 for (;;) {
61 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
62 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd)
63 break;
64 schedule();
65 }
66 finish_wait(sk_sleep(sk), &wait);
67 }
68 /* beware - socket is still in use by atmsigd until the last
69 as_indicate has been answered */
70 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
71 atm_return(vcc, skb->truesize);
72 pr_debug("LISTEN REL\n");
73 sigd_enq2(NULL, as_reject, vcc, NULL, NULL, &vcc->qos, 0);
74 dev_kfree_skb(skb);
75 }
76 clear_bit(ATM_VF_REGIS, &vcc->flags);
77 /* ... may retry later */
78}
79
80static int svc_release(struct socket *sock)
81{
82 struct sock *sk = sock->sk;
83 struct atm_vcc *vcc;
84
85 if (sk) {
86 vcc = ATM_SD(sock);
87 pr_debug("%p\n", vcc);
88 clear_bit(ATM_VF_READY, &vcc->flags);
89 /*
90 * VCC pointer is used as a reference,
91 * so we must not free it (thereby subjecting it to re-use)
92 * before all pending connections are closed
93 */
94 svc_disconnect(vcc);
95 vcc_release(sock);
96 }
97 return 0;
98}
99
100static int svc_bind(struct socket *sock, struct sockaddr *sockaddr,
101 int sockaddr_len)
102{
103 DEFINE_WAIT(wait);
104 struct sock *sk = sock->sk;
105 struct sockaddr_atmsvc *addr;
106 struct atm_vcc *vcc;
107 int error;
108
109 if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
110 return -EINVAL;
111 lock_sock(sk);
112 if (sock->state == SS_CONNECTED) {
113 error = -EISCONN;
114 goto out;
115 }
116 if (sock->state != SS_UNCONNECTED) {
117 error = -EINVAL;
118 goto out;
119 }
120 vcc = ATM_SD(sock);
121 addr = (struct sockaddr_atmsvc *) sockaddr;
122 if (addr->sas_family != AF_ATMSVC) {
123 error = -EAFNOSUPPORT;
124 goto out;
125 }
126 clear_bit(ATM_VF_BOUND, &vcc->flags);
127 /* failing rebind will kill old binding */
128 /* @@@ check memory (de)allocation on rebind */
129 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
130 error = -EBADFD;
131 goto out;
132 }
133 vcc->local = *addr;
134 set_bit(ATM_VF_WAITING, &vcc->flags);
135 sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local);
136 for (;;) {
137 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
138 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
139 break;
140 schedule();
141 }
142 finish_wait(sk_sleep(sk), &wait);
143 clear_bit(ATM_VF_REGIS, &vcc->flags); /* doesn't count */
144 if (!sigd) {
145 error = -EUNATCH;
146 goto out;
147 }
148 if (!sk->sk_err)
149 set_bit(ATM_VF_BOUND, &vcc->flags);
150 error = -sk->sk_err;
151out:
152 release_sock(sk);
153 return error;
154}
155
156static int svc_connect(struct socket *sock, struct sockaddr *sockaddr,
157 int sockaddr_len, int flags)
158{
159 DEFINE_WAIT(wait);
160 struct sock *sk = sock->sk;
161 struct sockaddr_atmsvc *addr;
162 struct atm_vcc *vcc = ATM_SD(sock);
163 int error;
164
165 pr_debug("%p\n", vcc);
166 lock_sock(sk);
167 if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
168 error = -EINVAL;
169 goto out;
170 }
171
172 switch (sock->state) {
173 default:
174 error = -EINVAL;
175 goto out;
176 case SS_CONNECTED:
177 error = -EISCONN;
178 goto out;
179 case SS_CONNECTING:
180 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
181 error = -EALREADY;
182 goto out;
183 }
184 sock->state = SS_UNCONNECTED;
185 if (sk->sk_err) {
186 error = -sk->sk_err;
187 goto out;
188 }
189 break;
190 case SS_UNCONNECTED:
191 addr = (struct sockaddr_atmsvc *) sockaddr;
192 if (addr->sas_family != AF_ATMSVC) {
193 error = -EAFNOSUPPORT;
194 goto out;
195 }
196 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
197 error = -EBADFD;
198 goto out;
199 }
200 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
201 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
202 error = -EINVAL;
203 goto out;
204 }
205 if (!vcc->qos.txtp.traffic_class &&
206 !vcc->qos.rxtp.traffic_class) {
207 error = -EINVAL;
208 goto out;
209 }
210 vcc->remote = *addr;
211 set_bit(ATM_VF_WAITING, &vcc->flags);
212 sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote);
213 if (flags & O_NONBLOCK) {
214 sock->state = SS_CONNECTING;
215 error = -EINPROGRESS;
216 goto out;
217 }
218 error = 0;
219 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
220 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
221 schedule();
222 if (!signal_pending(current)) {
223 prepare_to_wait(sk_sleep(sk), &wait,
224 TASK_INTERRUPTIBLE);
225 continue;
226 }
227 pr_debug("*ABORT*\n");
228 /*
229 * This is tricky:
230 * Kernel ---close--> Demon
231 * Kernel <--close--- Demon
232 * or
233 * Kernel ---close--> Demon
234 * Kernel <--error--- Demon
235 * or
236 * Kernel ---close--> Demon
237 * Kernel <--okay---- Demon
238 * Kernel <--close--- Demon
239 */
240 sigd_enq(vcc, as_close, NULL, NULL, NULL);
241 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
242 prepare_to_wait(sk_sleep(sk), &wait,
243 TASK_INTERRUPTIBLE);
244 schedule();
245 }
246 if (!sk->sk_err)
247 while (!test_bit(ATM_VF_RELEASED, &vcc->flags) &&
248 sigd) {
249 prepare_to_wait(sk_sleep(sk), &wait,
250 TASK_INTERRUPTIBLE);
251 schedule();
252 }
253 clear_bit(ATM_VF_REGIS, &vcc->flags);
254 clear_bit(ATM_VF_RELEASED, &vcc->flags);
255 clear_bit(ATM_VF_CLOSE, &vcc->flags);
256 /* we're gone now but may connect later */
257 error = -EINTR;
258 break;
259 }
260 finish_wait(sk_sleep(sk), &wait);
261 if (error)
262 goto out;
263 if (!sigd) {
264 error = -EUNATCH;
265 goto out;
266 }
267 if (sk->sk_err) {
268 error = -sk->sk_err;
269 goto out;
270 }
271 }
272
273 vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
274 vcc->qos.txtp.pcr = 0;
275 vcc->qos.txtp.min_pcr = 0;
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 sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local);
307 for (;;) {
308 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
309 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
310 break;
311 schedule();
312 }
313 finish_wait(sk_sleep(sk), &wait);
314 if (!sigd) {
315 error = -EUNATCH;
316 goto out;
317 }
318 set_bit(ATM_VF_LISTEN, &vcc->flags);
319 vcc_insert_socket(sk);
320 sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
321 error = -sk->sk_err;
322out:
323 release_sock(sk);
324 return error;
325}
326
327static int svc_accept(struct socket *sock, struct socket *newsock,
328 struct proto_accept_arg *arg)
329{
330 struct sock *sk = sock->sk;
331 struct sk_buff *skb;
332 struct atmsvc_msg *msg;
333 struct atm_vcc *old_vcc = ATM_SD(sock);
334 struct atm_vcc *new_vcc;
335 int error;
336
337 lock_sock(sk);
338
339 error = svc_create(sock_net(sk), newsock, 0, arg->kern);
340 if (error)
341 goto out;
342
343 new_vcc = ATM_SD(newsock);
344
345 pr_debug("%p -> %p\n", old_vcc, new_vcc);
346 while (1) {
347 DEFINE_WAIT(wait);
348
349 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
350 while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
351 sigd) {
352 if (test_bit(ATM_VF_RELEASED, &old_vcc->flags))
353 break;
354 if (test_bit(ATM_VF_CLOSE, &old_vcc->flags)) {
355 error = -sk->sk_err;
356 break;
357 }
358 if (arg->flags & O_NONBLOCK) {
359 error = -EAGAIN;
360 break;
361 }
362 release_sock(sk);
363 schedule();
364 lock_sock(sk);
365 if (signal_pending(current)) {
366 error = -ERESTARTSYS;
367 break;
368 }
369 prepare_to_wait(sk_sleep(sk), &wait,
370 TASK_INTERRUPTIBLE);
371 }
372 finish_wait(sk_sleep(sk), &wait);
373 if (error)
374 goto out;
375 if (!skb) {
376 error = -EUNATCH;
377 goto out;
378 }
379 msg = (struct atmsvc_msg *)skb->data;
380 new_vcc->qos = msg->qos;
381 set_bit(ATM_VF_HASQOS, &new_vcc->flags);
382 new_vcc->remote = msg->svc;
383 new_vcc->local = msg->local;
384 new_vcc->sap = msg->sap;
385 error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
386 msg->pvc.sap_addr.vpi,
387 msg->pvc.sap_addr.vci);
388 dev_kfree_skb(skb);
389 sk_acceptq_removed(sk);
390 if (error) {
391 sigd_enq2(NULL, as_reject, old_vcc, NULL, NULL,
392 &old_vcc->qos, error);
393 error = error == -EAGAIN ? -EBUSY : error;
394 goto out;
395 }
396 /* wait should be short, so we ignore the non-blocking flag */
397 set_bit(ATM_VF_WAITING, &new_vcc->flags);
398 sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL);
399 for (;;) {
400 prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
401 TASK_UNINTERRUPTIBLE);
402 if (!test_bit(ATM_VF_WAITING, &new_vcc->flags) || !sigd)
403 break;
404 release_sock(sk);
405 schedule();
406 lock_sock(sk);
407 }
408 finish_wait(sk_sleep(sk_atm(new_vcc)), &wait);
409 if (!sigd) {
410 error = -EUNATCH;
411 goto out;
412 }
413 if (!sk_atm(new_vcc)->sk_err)
414 break;
415 if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
416 error = -sk_atm(new_vcc)->sk_err;
417 goto out;
418 }
419 }
420 newsock->state = SS_CONNECTED;
421out:
422 release_sock(sk);
423 return error;
424}
425
426static int svc_getname(struct socket *sock, struct sockaddr *sockaddr,
427 int peer)
428{
429 struct sockaddr_atmsvc *addr;
430
431 addr = (struct sockaddr_atmsvc *) sockaddr;
432 memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
433 sizeof(struct sockaddr_atmsvc));
434 return sizeof(struct sockaddr_atmsvc);
435}
436
437int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
438{
439 struct sock *sk = sk_atm(vcc);
440 DEFINE_WAIT(wait);
441
442 set_bit(ATM_VF_WAITING, &vcc->flags);
443 sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0);
444 for (;;) {
445 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
446 if (!test_bit(ATM_VF_WAITING, &vcc->flags) ||
447 test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd) {
448 break;
449 }
450 schedule();
451 }
452 finish_wait(sk_sleep(sk), &wait);
453 if (!sigd)
454 return -EUNATCH;
455 return -sk->sk_err;
456}
457
458static int svc_setsockopt(struct socket *sock, int level, int optname,
459 sockptr_t optval, unsigned int optlen)
460{
461 struct sock *sk = sock->sk;
462 struct atm_vcc *vcc = ATM_SD(sock);
463 int value, error = 0;
464
465 lock_sock(sk);
466 switch (optname) {
467 case SO_ATMSAP:
468 if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
469 error = -EINVAL;
470 goto out;
471 }
472 if (copy_from_sockptr(&vcc->sap, optval, optlen)) {
473 error = -EFAULT;
474 goto out;
475 }
476 set_bit(ATM_VF_HASSAP, &vcc->flags);
477 break;
478 case SO_MULTIPOINT:
479 if (level != SOL_ATM || optlen != sizeof(int)) {
480 error = -EINVAL;
481 goto out;
482 }
483 if (copy_from_sockptr(&value, optval, sizeof(int))) {
484 error = -EFAULT;
485 goto out;
486 }
487 if (value == 1)
488 set_bit(ATM_VF_SESSION, &vcc->flags);
489 else if (value == 0)
490 clear_bit(ATM_VF_SESSION, &vcc->flags);
491 else
492 error = -EINVAL;
493 break;
494 default:
495 error = vcc_setsockopt(sock, level, optname, optval, optlen);
496 }
497
498out:
499 release_sock(sk);
500 return error;
501}
502
503static int svc_getsockopt(struct socket *sock, int level, int optname,
504 char __user *optval, int __user *optlen)
505{
506 struct sock *sk = sock->sk;
507 int error = 0, len;
508
509 lock_sock(sk);
510 if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
511 error = vcc_getsockopt(sock, level, optname, optval, optlen);
512 goto out;
513 }
514 if (get_user(len, optlen)) {
515 error = -EFAULT;
516 goto out;
517 }
518 if (len != sizeof(struct atm_sap)) {
519 error = -EINVAL;
520 goto out;
521 }
522 if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
523 error = -EFAULT;
524 goto out;
525 }
526out:
527 release_sock(sk);
528 return error;
529}
530
531static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
532 int sockaddr_len, int flags)
533{
534 DEFINE_WAIT(wait);
535 struct sock *sk = sock->sk;
536 struct atm_vcc *vcc = ATM_SD(sock);
537 int error;
538
539 lock_sock(sk);
540 set_bit(ATM_VF_WAITING, &vcc->flags);
541 sigd_enq(vcc, as_addparty, NULL, NULL,
542 (struct sockaddr_atmsvc *) sockaddr);
543 if (flags & O_NONBLOCK) {
544 error = -EINPROGRESS;
545 goto out;
546 }
547 pr_debug("added wait queue\n");
548 for (;;) {
549 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
550 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
551 break;
552 schedule();
553 }
554 finish_wait(sk_sleep(sk), &wait);
555 error = -xchg(&sk->sk_err_soft, 0);
556out:
557 release_sock(sk);
558 return error;
559}
560
561static int svc_dropparty(struct socket *sock, int ep_ref)
562{
563 DEFINE_WAIT(wait);
564 struct sock *sk = sock->sk;
565 struct atm_vcc *vcc = ATM_SD(sock);
566 int error;
567
568 lock_sock(sk);
569 set_bit(ATM_VF_WAITING, &vcc->flags);
570 sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
571 for (;;) {
572 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
573 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
574 break;
575 schedule();
576 }
577 finish_wait(sk_sleep(sk), &wait);
578 if (!sigd) {
579 error = -EUNATCH;
580 goto out;
581 }
582 error = -xchg(&sk->sk_err_soft, 0);
583out:
584 release_sock(sk);
585 return error;
586}
587
588static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
589{
590 int error, ep_ref;
591 struct sockaddr_atmsvc sa;
592 struct atm_vcc *vcc = ATM_SD(sock);
593
594 switch (cmd) {
595 case ATM_ADDPARTY:
596 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
597 return -EINVAL;
598 if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
599 return -EFAULT;
600 error = svc_addparty(sock, (struct sockaddr *)&sa, sizeof(sa),
601 0);
602 break;
603 case ATM_DROPPARTY:
604 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
605 return -EINVAL;
606 if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
607 return -EFAULT;
608 error = svc_dropparty(sock, ep_ref);
609 break;
610 default:
611 error = vcc_ioctl(sock, cmd, arg);
612 }
613
614 return error;
615}
616
617#ifdef CONFIG_COMPAT
618static int svc_compat_ioctl(struct socket *sock, unsigned int cmd,
619 unsigned long arg)
620{
621 /* The definition of ATM_ADDPARTY uses the size of struct atm_iobuf.
622 But actually it takes a struct sockaddr_atmsvc, which doesn't need
623 compat handling. So all we have to do is fix up cmd... */
624 if (cmd == COMPAT_ATM_ADDPARTY)
625 cmd = ATM_ADDPARTY;
626
627 if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY)
628 return svc_ioctl(sock, cmd, arg);
629 else
630 return vcc_compat_ioctl(sock, cmd, arg);
631}
632#endif /* CONFIG_COMPAT */
633
634static const struct proto_ops svc_proto_ops = {
635 .family = PF_ATMSVC,
636 .owner = THIS_MODULE,
637
638 .release = svc_release,
639 .bind = svc_bind,
640 .connect = svc_connect,
641 .socketpair = sock_no_socketpair,
642 .accept = svc_accept,
643 .getname = svc_getname,
644 .poll = vcc_poll,
645 .ioctl = svc_ioctl,
646#ifdef CONFIG_COMPAT
647 .compat_ioctl = svc_compat_ioctl,
648#endif
649 .gettstamp = sock_gettstamp,
650 .listen = svc_listen,
651 .shutdown = svc_shutdown,
652 .setsockopt = svc_setsockopt,
653 .getsockopt = svc_getsockopt,
654 .sendmsg = vcc_sendmsg,
655 .recvmsg = vcc_recvmsg,
656 .mmap = sock_no_mmap,
657};
658
659
660static int svc_create(struct net *net, struct socket *sock, int protocol,
661 int kern)
662{
663 int error;
664
665 if (!net_eq(net, &init_net))
666 return -EAFNOSUPPORT;
667
668 sock->ops = &svc_proto_ops;
669 error = vcc_create(net, sock, protocol, AF_ATMSVC, kern);
670 if (error)
671 return error;
672 ATM_SD(sock)->local.sas_family = AF_ATMSVC;
673 ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
674 return 0;
675}
676
677static const struct net_proto_family svc_family_ops = {
678 .family = PF_ATMSVC,
679 .create = svc_create,
680 .owner = THIS_MODULE,
681};
682
683
684/*
685 * Initialize the ATM SVC protocol family
686 */
687
688int __init atmsvc_init(void)
689{
690 return sock_register(&svc_family_ops);
691}
692
693void atmsvc_exit(void)
694{
695 sock_unregister(PF_ATMSVC);
696}
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}