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Linux-2.6.12-rc2
[linux.git] / net / atm / svc.c
CommitLineData
1da177e4
LT		 1/* net/atm/svc.c - ATM SVC sockets */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5
6#include <linux/string.h>
7#include <linux/net.h> /* struct socket, struct proto_ops */
8#include <linux/errno.h> /* error codes */
9#include <linux/kernel.h> /* printk */
10#include <linux/skbuff.h>
11#include <linux/wait.h>
12#include <linux/sched.h> /* jiffies and HZ */
13#include <linux/fcntl.h> /* O_NONBLOCK */
14#include <linux/init.h>
15#include <linux/atm.h> /* ATM stuff */
16#include <linux/atmsap.h>
17#include <linux/atmsvc.h>
18#include <linux/atmdev.h>
19#include <linux/bitops.h>
20#include <net/sock.h> /* for sock_no_* */
21#include <asm/uaccess.h>
22
23#include "resources.h"
24#include "common.h" /* common for PVCs and SVCs */
25#include "signaling.h"
26#include "addr.h"
27
28
29#if 0
30#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
31#else
32#define DPRINTK(format,args...)
33#endif
34
35
36static int svc_create(struct socket *sock,int protocol);
37
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
51
52static void svc_disconnect(struct atm_vcc *vcc)
53{
54 DEFINE_WAIT(wait);
55 struct sk_buff *skb;
56 struct sock *sk = sk_atm(vcc);
57
58 DPRINTK("svc_disconnect %p\n",vcc);
59 if (test_bit(ATM_VF_REGIS,&vcc->flags)) {
60 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
61 sigd_enq(vcc,as_close,NULL,NULL,NULL);
62 while (!test_bit(ATM_VF_RELEASED,&vcc->flags) && sigd) {
63 schedule();
64 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
65 }
66 finish_wait(sk->sk_sleep, &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 DPRINTK("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
80
81static int svc_release(struct socket *sock)
82{
83 struct sock *sk = sock->sk;
84 struct atm_vcc *vcc;
85
86 if (sk) {
87 vcc = ATM_SD(sock);
88 DPRINTK("svc_release %p\n", vcc);
89 clear_bit(ATM_VF_READY, &vcc->flags);
90 /* VCC pointer is used as a reference, so we must not free it
91 (thereby subjecting it to re-use) before all pending connections
92 are closed */
93 svc_disconnect(vcc);
94 vcc_release(sock);
95 }
96 return 0;
97}
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 if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
122 error = -EINVAL;
123 goto out;
124 }
125 addr = (struct sockaddr_atmsvc *) sockaddr;
126 if (addr->sas_family != AF_ATMSVC) {
127 error = -EAFNOSUPPORT;
128 goto out;
129 }
130 clear_bit(ATM_VF_BOUND,&vcc->flags);
131 /* failing rebind will kill old binding */
132 /* @@@ check memory (de)allocation on rebind */
133 if (!test_bit(ATM_VF_HASQOS,&vcc->flags)) {
134 error = -EBADFD;
135 goto out;
136 }
137 vcc->local = *addr;
138 set_bit(ATM_VF_WAITING, &vcc->flags);
139 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
140 sigd_enq(vcc,as_bind,NULL,NULL,&vcc->local);
141 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
142 schedule();
143 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
144 }
145 finish_wait(sk->sk_sleep, &wait);
146 clear_bit(ATM_VF_REGIS,&vcc->flags); /* doesn't count */
147 if (!sigd) {
148 error = -EUNATCH;
149 goto out;
150 }
151 if (!sk->sk_err)
152 set_bit(ATM_VF_BOUND,&vcc->flags);
153 error = -sk->sk_err;
154out:
155 release_sock(sk);
156 return error;
157}
158
159
160static int svc_connect(struct socket *sock,struct sockaddr *sockaddr,
161 int sockaddr_len,int flags)
162{
163 DEFINE_WAIT(wait);
164 struct sock *sk = sock->sk;
165 struct sockaddr_atmsvc *addr;
166 struct atm_vcc *vcc = ATM_SD(sock);
167 int error;
168
169 DPRINTK("svc_connect %p\n",vcc);
170 lock_sock(sk);
171 if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
172 error = -EINVAL;
173 goto out;
174 }
175
176 switch (sock->state) {
177 default:
178 error = -EINVAL;
179 goto out;
180 case SS_CONNECTED:
181 error = -EISCONN;
182 goto out;
183 case SS_CONNECTING:
184 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
185 error = -EALREADY;
186 goto out;
187 }
188 sock->state = SS_UNCONNECTED;
189 if (sk->sk_err) {
190 error = -sk->sk_err;
191 goto out;
192 }
193 break;
194 case SS_UNCONNECTED:
195 addr = (struct sockaddr_atmsvc *) sockaddr;
196 if (addr->sas_family != AF_ATMSVC) {
197 error = -EAFNOSUPPORT;
198 goto out;
199 }
200 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
201 error = -EBADFD;
202 goto out;
203 }
204 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
205 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
206 error = -EINVAL;
207 goto out;
208 }
209 if (!vcc->qos.txtp.traffic_class &&
210 !vcc->qos.rxtp.traffic_class) {
211 error = -EINVAL;
212 goto out;
213 }
214 vcc->remote = *addr;
215 set_bit(ATM_VF_WAITING, &vcc->flags);
216 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
217 sigd_enq(vcc,as_connect,NULL,NULL,&vcc->remote);
218 if (flags & O_NONBLOCK) {
219 finish_wait(sk->sk_sleep, &wait);
220 sock->state = SS_CONNECTING;
221 error = -EINPROGRESS;
222 goto out;
223 }
224 error = 0;
225 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
226 schedule();
227 if (!signal_pending(current)) {
228 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
229 continue;
230 }
231 DPRINTK("*ABORT*\n");
232 /*
233 * This is tricky:
234 * Kernel ---close--> Demon
235 * Kernel <--close--- Demon
236 * or
237 * Kernel ---close--> Demon
238 * Kernel <--error--- Demon
239 * or
240 * Kernel ---close--> Demon
241 * Kernel <--okay---- Demon
242 * Kernel <--close--- Demon
243 */
244 sigd_enq(vcc,as_close,NULL,NULL,NULL);
245 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
246 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
247 schedule();
248 }
249 if (!sk->sk_err)
250 while (!test_bit(ATM_VF_RELEASED,&vcc->flags)
251 && sigd) {
252 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
253 schedule();
254 }
255 clear_bit(ATM_VF_REGIS,&vcc->flags);
256 clear_bit(ATM_VF_RELEASED,&vcc->flags);
257 clear_bit(ATM_VF_CLOSE,&vcc->flags);
258 /* we're gone now but may connect later */
259 error = -EINTR;
260 break;
261 }
262 finish_wait(sk->sk_sleep, &wait);
263 if (error)
264 goto out;
265 if (!sigd) {
266 error = -EUNATCH;
267 goto out;
268 }
269 if (sk->sk_err) {
270 error = -sk->sk_err;
271 goto out;
272 }
273 }
274/*
275 * Not supported yet
276 *
277 * #ifndef CONFIG_SINGLE_SIGITF
278 */
279 vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
280 vcc->qos.txtp.pcr = 0;
281 vcc->qos.txtp.min_pcr = 0;
282/*
283 * #endif
284 */
285 if (!(error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci)))
286 sock->state = SS_CONNECTED;
287 else
288 (void) svc_disconnect(vcc);
289out:
290 release_sock(sk);
291 return error;
292}
293
294
295static int svc_listen(struct socket *sock,int backlog)
296{
297 DEFINE_WAIT(wait);
298 struct sock *sk = sock->sk;
299 struct atm_vcc *vcc = ATM_SD(sock);
300 int error;
301
302 DPRINTK("svc_listen %p\n",vcc);
303 lock_sock(sk);
304 /* let server handle listen on unbound sockets */
305 if (test_bit(ATM_VF_SESSION,&vcc->flags)) {
306 error = -EINVAL;
307 goto out;
308 }
309 set_bit(ATM_VF_WAITING, &vcc->flags);
310 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
311 sigd_enq(vcc,as_listen,NULL,NULL,&vcc->local);
312 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
313 schedule();
314 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
315 }
316 finish_wait(sk->sk_sleep, &wait);
317 if (!sigd) {
318 error = -EUNATCH;
319 goto out;
320 }
321 set_bit(ATM_VF_LISTEN,&vcc->flags);
322 sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
323 error = -sk->sk_err;
324out:
325 release_sock(sk);
326 return error;
327}
328
329
330static int svc_accept(struct socket *sock,struct socket *newsock,int flags)
331{
332 struct sock *sk = sock->sk;
333 struct sk_buff *skb;
334 struct atmsvc_msg *msg;
335 struct atm_vcc *old_vcc = ATM_SD(sock);
336 struct atm_vcc *new_vcc;
337 int error;
338
339 lock_sock(sk);
340
341 error = svc_create(newsock,0);
342 if (error)
343 goto out;
344
345 new_vcc = ATM_SD(newsock);
346
347 DPRINTK("svc_accept %p -> %p\n",old_vcc,new_vcc);
348 while (1) {
349 DEFINE_WAIT(wait);
350
351 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
352 while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
353 sigd) {
354 if (test_bit(ATM_VF_RELEASED,&old_vcc->flags)) break;
355 if (test_bit(ATM_VF_CLOSE,&old_vcc->flags)) {
356 error = -sk->sk_err;
357 break;
358 }
359 if (flags & O_NONBLOCK) {
360 error = -EAGAIN;
361 break;
362 }
363 release_sock(sk);
364 schedule();
365 lock_sock(sk);
366 if (signal_pending(current)) {
367 error = -ERESTARTSYS;
368 break;
369 }
370 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
371 }
372 finish_wait(sk->sk_sleep, &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, msg->pvc.sap_addr.vci);
387 dev_kfree_skb(skb);
388 sk->sk_ack_backlog--;
389 if (error) {
390 sigd_enq2(NULL,as_reject,old_vcc,NULL,NULL,
391 &old_vcc->qos,error);
392 error = error == -EAGAIN ? -EBUSY : error;
393 goto out;
394 }
395 /* wait should be short, so we ignore the non-blocking flag */
396 set_bit(ATM_VF_WAITING, &new_vcc->flags);
397 prepare_to_wait(sk_atm(new_vcc)->sk_sleep, &wait, 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_atm(new_vcc)->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
404 }
405 finish_wait(sk_atm(new_vcc)->sk_sleep, &wait);
406 if (!sigd) {
407 error = -EUNATCH;
408 goto out;
409 }
410 if (!sk_atm(new_vcc)->sk_err)
411 break;
412 if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
413 error = -sk_atm(new_vcc)->sk_err;
414 goto out;
415 }
416 }
417 newsock->state = SS_CONNECTED;
418out:
419 release_sock(sk);
420 return error;
421}
422
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
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 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
444 sigd_enq2(vcc,as_modify,NULL,NULL,&vcc->local,qos,0);
445 while (test_bit(ATM_VF_WAITING, &vcc->flags) &&
446 !test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) {
447 schedule();
448 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
449 }
450 finish_wait(sk->sk_sleep, &wait);
451 if (!sigd) return -EUNATCH;
452 return -sk->sk_err;
453}
454
455
456static int svc_setsockopt(struct socket *sock, int level, int optname,
457 char __user *optval, int optlen)
458{
459 struct sock *sk = sock->sk;
460 struct atm_vcc *vcc = ATM_SD(sock);
461 int value, error = 0;
462
463 lock_sock(sk);
464 switch (optname) {
465 case SO_ATMSAP:
466 if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
467 error = -EINVAL;
468 goto out;
469 }
470 if (copy_from_user(&vcc->sap, optval, optlen)) {
471 error = -EFAULT;
472 goto out;
473 }
474 set_bit(ATM_VF_HASSAP, &vcc->flags);
475 break;
476 case SO_MULTIPOINT:
477 if (level != SOL_ATM || optlen != sizeof(int)) {
478 error = -EINVAL;
479 goto out;
480 }
481 if (get_user(value, (int __user *) optval)) {
482 error = -EFAULT;
483 goto out;
484 }
485 if (value == 1) {
486 set_bit(ATM_VF_SESSION, &vcc->flags);
487 } else if (value == 0) {
488 clear_bit(ATM_VF_SESSION, &vcc->flags);
489 } else {
490 error = -EINVAL;
491 }
492 break;
493 default:
494 error = vcc_setsockopt(sock, level, optname,
495 optval, optlen);
496 }
497
498out:
499 release_sock(sk);
500 return error;
501}
502
503
504static int svc_getsockopt(struct socket *sock,int level,int optname,
505 char __user *optval,int __user *optlen)
506{
507 struct sock *sk = sock->sk;
508 int error = 0, len;
509
510 lock_sock(sk);
511 if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
512 error = vcc_getsockopt(sock, level, optname, optval, optlen);
513 goto out;
514 }
515 if (get_user(len, optlen)) {
516 error = -EFAULT;
517 goto out;
518 }
519 if (len != sizeof(struct atm_sap)) {
520 error = -EINVAL;
521 goto out;
522 }
523 if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
524 error = -EFAULT;
525 goto out;
526 }
527out:
528 release_sock(sk);
529 return error;
530}
531
532
533static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
534 int sockaddr_len, int flags)
535{
536 DEFINE_WAIT(wait);
537 struct sock *sk = sock->sk;
538 struct atm_vcc *vcc = ATM_SD(sock);
539 int error;
540
541 lock_sock(sk);
542 set_bit(ATM_VF_WAITING, &vcc->flags);
543 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
544 sigd_enq(vcc, as_addparty, NULL, NULL,
545 (struct sockaddr_atmsvc *) sockaddr);
546 if (flags & O_NONBLOCK) {
547 finish_wait(sk->sk_sleep, &wait);
548 error = -EINPROGRESS;
549 goto out;
550 }
551 DPRINTK("svc_addparty added wait queue\n");
552 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
553 schedule();
554 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
555 }
556 finish_wait(sk->sk_sleep, &wait);
557 error = xchg(&sk->sk_err_soft, 0);
558out:
559 release_sock(sk);
560 return error;
561}
562
563
564static int svc_dropparty(struct socket *sock, int ep_ref)
565{
566 DEFINE_WAIT(wait);
567 struct sock *sk = sock->sk;
568 struct atm_vcc *vcc = ATM_SD(sock);
569 int error;
570
571 lock_sock(sk);
572 set_bit(ATM_VF_WAITING, &vcc->flags);
573 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
574 sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
575 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
576 schedule();
577 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
578 }
579 finish_wait(sk->sk_sleep, &wait);
580 if (!sigd) {
581 error = -EUNATCH;
582 goto out;
583 }
584 error = xchg(&sk->sk_err_soft, 0);
585out:
586 release_sock(sk);
587 return error;
588}
589
590
591static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
592{
593 int error, ep_ref;
594 struct sockaddr_atmsvc sa;
595 struct atm_vcc *vcc = ATM_SD(sock);
596
597 switch (cmd) {
598 case ATM_ADDPARTY:
599 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
600 return -EINVAL;
601 if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
602 return -EFAULT;
603 error = svc_addparty(sock, (struct sockaddr *) &sa, sizeof(sa), 0);
604 break;
605 case ATM_DROPPARTY:
606 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
607 return -EINVAL;
608 if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
609 return -EFAULT;
610 error = svc_dropparty(sock, ep_ref);
611 break;
612 default:
613 error = vcc_ioctl(sock, cmd, arg);
614 }
615
616 return error;
617}
618
619static struct proto_ops svc_proto_ops = {
620 .family = PF_ATMSVC,
621 .owner = THIS_MODULE,
622
623 .release = svc_release,
624 .bind = svc_bind,
625 .connect = svc_connect,
626 .socketpair = sock_no_socketpair,
627 .accept = svc_accept,
628 .getname = svc_getname,
629 .poll = vcc_poll,
630 .ioctl = svc_ioctl,
631 .listen = svc_listen,
632 .shutdown = svc_shutdown,
633 .setsockopt = svc_setsockopt,
634 .getsockopt = svc_getsockopt,
635 .sendmsg = vcc_sendmsg,
636 .recvmsg = vcc_recvmsg,
637 .mmap = sock_no_mmap,
638 .sendpage = sock_no_sendpage,
639};
640
641
642static int svc_create(struct socket *sock,int protocol)
643{
644 int error;
645
646 sock->ops = &svc_proto_ops;
647 error = vcc_create(sock, protocol, AF_ATMSVC);
648 if (error) return error;
649 ATM_SD(sock)->local.sas_family = AF_ATMSVC;
650 ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
651 return 0;
652}
653
654
655static struct net_proto_family svc_family_ops = {
656 .family = PF_ATMSVC,
657 .create = svc_create,
658 .owner = THIS_MODULE,
659};
660
661
662/*
663 * Initialize the ATM SVC protocol family
664 */
665
666int __init atmsvc_init(void)
667{
668 return sock_register(&svc_family_ops);
669}
670
671void atmsvc_exit(void)
672{
673 sock_unregister(PF_ATMSVC);
674}
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