Phonet: basic net namespace support
[linux-3.10.git] / net / atm / svc.c
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 static int svc_create(struct net *net, struct socket *sock,int protocol);
29
30 /*
31  * Note: since all this is still nicely synchronized with the signaling demon,
32  *       there's no need to protect sleep loops with clis. If signaling is
33  *       moved into the kernel, that would change.
34  */
35
36
37 static int svc_shutdown(struct socket *sock,int how)
38 {
39         return 0;
40 }
41
42
43 static void svc_disconnect(struct atm_vcc *vcc)
44 {
45         DEFINE_WAIT(wait);
46         struct sk_buff *skb;
47         struct sock *sk = sk_atm(vcc);
48
49         pr_debug("svc_disconnect %p\n",vcc);
50         if (test_bit(ATM_VF_REGIS,&vcc->flags)) {
51                 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
52                 sigd_enq(vcc,as_close,NULL,NULL,NULL);
53                 while (!test_bit(ATM_VF_RELEASED,&vcc->flags) && sigd) {
54                         schedule();
55                         prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
56                 }
57                 finish_wait(sk->sk_sleep, &wait);
58         }
59         /* beware - socket is still in use by atmsigd until the last
60            as_indicate has been answered */
61         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
62                 atm_return(vcc, skb->truesize);
63                 pr_debug("LISTEN REL\n");
64                 sigd_enq2(NULL,as_reject,vcc,NULL,NULL,&vcc->qos,0);
65                 dev_kfree_skb(skb);
66         }
67         clear_bit(ATM_VF_REGIS, &vcc->flags);
68         /* ... may retry later */
69 }
70
71
72 static int svc_release(struct socket *sock)
73 {
74         struct sock *sk = sock->sk;
75         struct atm_vcc *vcc;
76
77         if (sk)  {
78                 vcc = ATM_SD(sock);
79                 pr_debug("svc_release %p\n", vcc);
80                 clear_bit(ATM_VF_READY, &vcc->flags);
81                 /* VCC pointer is used as a reference, so we must not free it
82                    (thereby subjecting it to re-use) before all pending connections
83                    are closed */
84                 svc_disconnect(vcc);
85                 vcc_release(sock);
86         }
87         return 0;
88 }
89
90
91 static int svc_bind(struct socket *sock,struct sockaddr *sockaddr,
92     int sockaddr_len)
93 {
94         DEFINE_WAIT(wait);
95         struct sock *sk = sock->sk;
96         struct sockaddr_atmsvc *addr;
97         struct atm_vcc *vcc;
98         int error;
99
100         if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
101                 return -EINVAL;
102         lock_sock(sk);
103         if (sock->state == SS_CONNECTED) {
104                 error = -EISCONN;
105                 goto out;
106         }
107         if (sock->state != SS_UNCONNECTED) {
108                 error = -EINVAL;
109                 goto out;
110         }
111         vcc = ATM_SD(sock);
112         addr = (struct sockaddr_atmsvc *) sockaddr;
113         if (addr->sas_family != AF_ATMSVC) {
114                 error = -EAFNOSUPPORT;
115                 goto out;
116         }
117         clear_bit(ATM_VF_BOUND,&vcc->flags);
118             /* failing rebind will kill old binding */
119         /* @@@ check memory (de)allocation on rebind */
120         if (!test_bit(ATM_VF_HASQOS,&vcc->flags)) {
121                 error = -EBADFD;
122                 goto out;
123         }
124         vcc->local = *addr;
125         set_bit(ATM_VF_WAITING, &vcc->flags);
126         prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
127         sigd_enq(vcc,as_bind,NULL,NULL,&vcc->local);
128         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
129                 schedule();
130                 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
131         }
132         finish_wait(sk->sk_sleep, &wait);
133         clear_bit(ATM_VF_REGIS,&vcc->flags); /* doesn't count */
134         if (!sigd) {
135                 error = -EUNATCH;
136                 goto out;
137         }
138         if (!sk->sk_err)
139                 set_bit(ATM_VF_BOUND,&vcc->flags);
140         error = -sk->sk_err;
141 out:
142         release_sock(sk);
143         return error;
144 }
145
146
147 static int svc_connect(struct socket *sock,struct sockaddr *sockaddr,
148     int sockaddr_len,int flags)
149 {
150         DEFINE_WAIT(wait);
151         struct sock *sk = sock->sk;
152         struct sockaddr_atmsvc *addr;
153         struct atm_vcc *vcc = ATM_SD(sock);
154         int error;
155
156         pr_debug("svc_connect %p\n",vcc);
157         lock_sock(sk);
158         if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
159                 error = -EINVAL;
160                 goto out;
161         }
162
163         switch (sock->state) {
164         default:
165                 error = -EINVAL;
166                 goto out;
167         case SS_CONNECTED:
168                 error = -EISCONN;
169                 goto out;
170         case SS_CONNECTING:
171                 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
172                         error = -EALREADY;
173                         goto out;
174                 }
175                 sock->state = SS_UNCONNECTED;
176                 if (sk->sk_err) {
177                         error = -sk->sk_err;
178                         goto out;
179                 }
180                 break;
181         case SS_UNCONNECTED:
182                 addr = (struct sockaddr_atmsvc *) sockaddr;
183                 if (addr->sas_family != AF_ATMSVC) {
184                         error = -EAFNOSUPPORT;
185                         goto out;
186                 }
187                 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
188                         error = -EBADFD;
189                         goto out;
190                 }
191                 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
192                     vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
193                         error = -EINVAL;
194                         goto out;
195                 }
196                 if (!vcc->qos.txtp.traffic_class &&
197                     !vcc->qos.rxtp.traffic_class) {
198                         error = -EINVAL;
199                         goto out;
200                 }
201                 vcc->remote = *addr;
202                 set_bit(ATM_VF_WAITING, &vcc->flags);
203                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
204                 sigd_enq(vcc,as_connect,NULL,NULL,&vcc->remote);
205                 if (flags & O_NONBLOCK) {
206                         finish_wait(sk->sk_sleep, &wait);
207                         sock->state = SS_CONNECTING;
208                         error = -EINPROGRESS;
209                         goto out;
210                 }
211                 error = 0;
212                 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
213                         schedule();
214                         if (!signal_pending(current)) {
215                                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
216                                 continue;
217                         }
218                         pr_debug("*ABORT*\n");
219                         /*
220                          * This is tricky:
221                          *   Kernel ---close--> Demon
222                          *   Kernel <--close--- Demon
223                          * or
224                          *   Kernel ---close--> Demon
225                          *   Kernel <--error--- Demon
226                          * or
227                          *   Kernel ---close--> Demon
228                          *   Kernel <--okay---- Demon
229                          *   Kernel <--close--- Demon
230                          */
231                         sigd_enq(vcc,as_close,NULL,NULL,NULL);
232                         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
233                                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
234                                 schedule();
235                         }
236                         if (!sk->sk_err)
237                                 while (!test_bit(ATM_VF_RELEASED,&vcc->flags)
238                                     && sigd) {
239                                         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
240                                         schedule();
241                                 }
242                         clear_bit(ATM_VF_REGIS,&vcc->flags);
243                         clear_bit(ATM_VF_RELEASED,&vcc->flags);
244                         clear_bit(ATM_VF_CLOSE,&vcc->flags);
245                             /* we're gone now but may connect later */
246                         error = -EINTR;
247                         break;
248                 }
249                 finish_wait(sk->sk_sleep, &wait);
250                 if (error)
251                         goto out;
252                 if (!sigd) {
253                         error = -EUNATCH;
254                         goto out;
255                 }
256                 if (sk->sk_err) {
257                         error = -sk->sk_err;
258                         goto out;
259                 }
260         }
261 /*
262  * Not supported yet
263  *
264  * #ifndef CONFIG_SINGLE_SIGITF
265  */
266         vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
267         vcc->qos.txtp.pcr = 0;
268         vcc->qos.txtp.min_pcr = 0;
269 /*
270  * #endif
271  */
272         if (!(error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci)))
273                 sock->state = SS_CONNECTED;
274         else
275                 (void) svc_disconnect(vcc);
276 out:
277         release_sock(sk);
278         return error;
279 }
280
281
282 static 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("svc_listen %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         vcc_insert_socket(sk);
297         set_bit(ATM_VF_WAITING, &vcc->flags);
298         prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
299         sigd_enq(vcc,as_listen,NULL,NULL,&vcc->local);
300         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
301                 schedule();
302                 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
303         }
304         finish_wait(sk->sk_sleep, &wait);
305         if (!sigd) {
306                 error = -EUNATCH;
307                 goto out;
308         }
309         set_bit(ATM_VF_LISTEN,&vcc->flags);
310         sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
311         error = -sk->sk_err;
312 out:
313         release_sock(sk);
314         return error;
315 }
316
317
318 static int svc_accept(struct socket *sock,struct socket *newsock,int flags)
319 {
320         struct sock *sk = sock->sk;
321         struct sk_buff *skb;
322         struct atmsvc_msg *msg;
323         struct atm_vcc *old_vcc = ATM_SD(sock);
324         struct atm_vcc *new_vcc;
325         int error;
326
327         lock_sock(sk);
328
329         error = svc_create(sock_net(sk), newsock,0);
330         if (error)
331                 goto out;
332
333         new_vcc = ATM_SD(newsock);
334
335         pr_debug("svc_accept %p -> %p\n",old_vcc,new_vcc);
336         while (1) {
337                 DEFINE_WAIT(wait);
338
339                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
340                 while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
341                        sigd) {
342                         if (test_bit(ATM_VF_RELEASED,&old_vcc->flags)) break;
343                         if (test_bit(ATM_VF_CLOSE,&old_vcc->flags)) {
344                                 error = -sk->sk_err;
345                                 break;
346                         }
347                         if (flags & O_NONBLOCK) {
348                                 error = -EAGAIN;
349                                 break;
350                         }
351                         release_sock(sk);
352                         schedule();
353                         lock_sock(sk);
354                         if (signal_pending(current)) {
355                                 error = -ERESTARTSYS;
356                                 break;
357                         }
358                         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
359                 }
360                 finish_wait(sk->sk_sleep, &wait);
361                 if (error)
362                         goto out;
363                 if (!skb) {
364                         error = -EUNATCH;
365                         goto out;
366                 }
367                 msg = (struct atmsvc_msg *) skb->data;
368                 new_vcc->qos = msg->qos;
369                 set_bit(ATM_VF_HASQOS,&new_vcc->flags);
370                 new_vcc->remote = msg->svc;
371                 new_vcc->local = msg->local;
372                 new_vcc->sap = msg->sap;
373                 error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
374                                     msg->pvc.sap_addr.vpi, msg->pvc.sap_addr.vci);
375                 dev_kfree_skb(skb);
376                 sk->sk_ack_backlog--;
377                 if (error) {
378                         sigd_enq2(NULL,as_reject,old_vcc,NULL,NULL,
379                             &old_vcc->qos,error);
380                         error = error == -EAGAIN ? -EBUSY : error;
381                         goto out;
382                 }
383                 /* wait should be short, so we ignore the non-blocking flag */
384                 set_bit(ATM_VF_WAITING, &new_vcc->flags);
385                 prepare_to_wait(sk_atm(new_vcc)->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
386                 sigd_enq(new_vcc,as_accept,old_vcc,NULL,NULL);
387                 while (test_bit(ATM_VF_WAITING, &new_vcc->flags) && sigd) {
388                         release_sock(sk);
389                         schedule();
390                         lock_sock(sk);
391                         prepare_to_wait(sk_atm(new_vcc)->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
392                 }
393                 finish_wait(sk_atm(new_vcc)->sk_sleep, &wait);
394                 if (!sigd) {
395                         error = -EUNATCH;
396                         goto out;
397                 }
398                 if (!sk_atm(new_vcc)->sk_err)
399                         break;
400                 if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
401                         error = -sk_atm(new_vcc)->sk_err;
402                         goto out;
403                 }
404         }
405         newsock->state = SS_CONNECTED;
406 out:
407         release_sock(sk);
408         return error;
409 }
410
411
412 static int svc_getname(struct socket *sock,struct sockaddr *sockaddr,
413     int *sockaddr_len,int peer)
414 {
415         struct sockaddr_atmsvc *addr;
416
417         *sockaddr_len = sizeof(struct sockaddr_atmsvc);
418         addr = (struct sockaddr_atmsvc *) sockaddr;
419         memcpy(addr,peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
420             sizeof(struct sockaddr_atmsvc));
421         return 0;
422 }
423
424
425 int svc_change_qos(struct atm_vcc *vcc,struct atm_qos *qos)
426 {
427         struct sock *sk = sk_atm(vcc);
428         DEFINE_WAIT(wait);
429
430         set_bit(ATM_VF_WAITING, &vcc->flags);
431         prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
432         sigd_enq2(vcc,as_modify,NULL,NULL,&vcc->local,qos,0);
433         while (test_bit(ATM_VF_WAITING, &vcc->flags) &&
434                !test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) {
435                 schedule();
436                 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
437         }
438         finish_wait(sk->sk_sleep, &wait);
439         if (!sigd) return -EUNATCH;
440         return -sk->sk_err;
441 }
442
443
444 static int svc_setsockopt(struct socket *sock, int level, int optname,
445                           char __user *optval, int optlen)
446 {
447         struct sock *sk = sock->sk;
448         struct atm_vcc *vcc = ATM_SD(sock);
449         int value, error = 0;
450
451         lock_sock(sk);
452         switch (optname) {
453                 case SO_ATMSAP:
454                         if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
455                                 error = -EINVAL;
456                                 goto out;
457                         }
458                         if (copy_from_user(&vcc->sap, optval, optlen)) {
459                                 error = -EFAULT;
460                                 goto out;
461                         }
462                         set_bit(ATM_VF_HASSAP, &vcc->flags);
463                         break;
464                 case SO_MULTIPOINT:
465                         if (level != SOL_ATM || optlen != sizeof(int)) {
466                                 error = -EINVAL;
467                                 goto out;
468                         }
469                         if (get_user(value, (int __user *) optval)) {
470                                 error = -EFAULT;
471                                 goto out;
472                         }
473                         if (value == 1) {
474                                 set_bit(ATM_VF_SESSION, &vcc->flags);
475                         } else if (value == 0) {
476                                 clear_bit(ATM_VF_SESSION, &vcc->flags);
477                         } else {
478                                 error = -EINVAL;
479                         }
480                         break;
481                 default:
482                         error = vcc_setsockopt(sock, level, optname,
483                                                optval, optlen);
484         }
485
486 out:
487         release_sock(sk);
488         return error;
489 }
490
491
492 static int svc_getsockopt(struct socket *sock,int level,int optname,
493     char __user *optval,int __user *optlen)
494 {
495         struct sock *sk = sock->sk;
496         int error = 0, len;
497
498         lock_sock(sk);
499         if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
500                 error = vcc_getsockopt(sock, level, optname, optval, optlen);
501                 goto out;
502         }
503         if (get_user(len, optlen)) {
504                 error = -EFAULT;
505                 goto out;
506         }
507         if (len != sizeof(struct atm_sap)) {
508                 error = -EINVAL;
509                 goto out;
510         }
511         if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
512                 error = -EFAULT;
513                 goto out;
514         }
515 out:
516         release_sock(sk);
517         return error;
518 }
519
520
521 static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
522                         int sockaddr_len, int flags)
523 {
524         DEFINE_WAIT(wait);
525         struct sock *sk = sock->sk;
526         struct atm_vcc *vcc = ATM_SD(sock);
527         int error;
528
529         lock_sock(sk);
530         set_bit(ATM_VF_WAITING, &vcc->flags);
531         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
532         sigd_enq(vcc, as_addparty, NULL, NULL,
533                  (struct sockaddr_atmsvc *) sockaddr);
534         if (flags & O_NONBLOCK) {
535                 finish_wait(sk->sk_sleep, &wait);
536                 error = -EINPROGRESS;
537                 goto out;
538         }
539         pr_debug("svc_addparty added wait queue\n");
540         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
541                 schedule();
542                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
543         }
544         finish_wait(sk->sk_sleep, &wait);
545         error = xchg(&sk->sk_err_soft, 0);
546 out:
547         release_sock(sk);
548         return error;
549 }
550
551
552 static int svc_dropparty(struct socket *sock, int ep_ref)
553 {
554         DEFINE_WAIT(wait);
555         struct sock *sk = sock->sk;
556         struct atm_vcc *vcc = ATM_SD(sock);
557         int error;
558
559         lock_sock(sk);
560         set_bit(ATM_VF_WAITING, &vcc->flags);
561         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
562         sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
563         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
564                 schedule();
565                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
566         }
567         finish_wait(sk->sk_sleep, &wait);
568         if (!sigd) {
569                 error = -EUNATCH;
570                 goto out;
571         }
572         error = xchg(&sk->sk_err_soft, 0);
573 out:
574         release_sock(sk);
575         return error;
576 }
577
578
579 static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
580 {
581         int error, ep_ref;
582         struct sockaddr_atmsvc sa;
583         struct atm_vcc *vcc = ATM_SD(sock);
584
585         switch (cmd) {
586                 case ATM_ADDPARTY:
587                         if (!test_bit(ATM_VF_SESSION, &vcc->flags))
588                                 return -EINVAL;
589                         if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
590                                 return -EFAULT;
591                         error = svc_addparty(sock, (struct sockaddr *) &sa, sizeof(sa), 0);
592                         break;
593                 case ATM_DROPPARTY:
594                         if (!test_bit(ATM_VF_SESSION, &vcc->flags))
595                                 return -EINVAL;
596                         if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
597                                 return -EFAULT;
598                         error = svc_dropparty(sock, ep_ref);
599                         break;
600                 default:
601                         error = vcc_ioctl(sock, cmd, arg);
602         }
603
604         return error;
605 }
606
607 static const struct proto_ops svc_proto_ops = {
608         .family =       PF_ATMSVC,
609         .owner =        THIS_MODULE,
610
611         .release =      svc_release,
612         .bind =         svc_bind,
613         .connect =      svc_connect,
614         .socketpair =   sock_no_socketpair,
615         .accept =       svc_accept,
616         .getname =      svc_getname,
617         .poll =         vcc_poll,
618         .ioctl =        svc_ioctl,
619         .listen =       svc_listen,
620         .shutdown =     svc_shutdown,
621         .setsockopt =   svc_setsockopt,
622         .getsockopt =   svc_getsockopt,
623         .sendmsg =      vcc_sendmsg,
624         .recvmsg =      vcc_recvmsg,
625         .mmap =         sock_no_mmap,
626         .sendpage =     sock_no_sendpage,
627 };
628
629
630 static int svc_create(struct net *net, struct socket *sock,int protocol)
631 {
632         int error;
633
634         if (net != &init_net)
635                 return -EAFNOSUPPORT;
636
637         sock->ops = &svc_proto_ops;
638         error = vcc_create(net, sock, protocol, AF_ATMSVC);
639         if (error) return error;
640         ATM_SD(sock)->local.sas_family = AF_ATMSVC;
641         ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
642         return 0;
643 }
644
645
646 static struct net_proto_family svc_family_ops = {
647         .family = PF_ATMSVC,
648         .create = svc_create,
649         .owner = THIS_MODULE,
650 };
651
652
653 /*
654  *      Initialize the ATM SVC protocol family
655  */
656
657 int __init atmsvc_init(void)
658 {
659         return sock_register(&svc_family_ops);
660 }
661
662 void atmsvc_exit(void)
663 {
664         sock_unregister(PF_ATMSVC);
665 }