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
36 static 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
46 static int svc_shutdown(struct socket *sock, int how)
47 {
48 return 0;
49 }
50
51 static 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
80 static 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
100 static 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;
151 out:
152 release_sock(sk);
153 return error;
154 }
155
156 static 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);
282 out:
283 release_sock(sk);
284 return error;
285 }
286
287 static 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;
322 out:
323 release_sock(sk);
324 return error;
325 }
326
327 static 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;
421 out:
422 release_sock(sk);
423 return error;
424 }
425
426 static 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
437 int 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
458 static 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
498 out:
499 release_sock(sk);
500 return error;
501 }
502
503 static 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 }
526 out:
527 release_sock(sk);
528 return error;
529 }
530
531 static 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);
556 out:
557 release_sock(sk);
558 return error;
559 }
560
561 static 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);
583 out:
584 release_sock(sk);
585 return error;
586 }
587
588 static 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
618 static 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
634 static 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
660 static 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
677 static 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
688 int __init atmsvc_init(void)
689 {
690 return sock_register(&svc_family_ops);
691 }
692
693 void atmsvc_exit(void)
694 {
695 sock_unregister(PF_ATMSVC);
696 }
697
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