xref: /openbmc/linux/net/atm/svc.c (revision be58f710) 
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 static int svc_create(struct net *net, struct socket *sock, int protocol,
32 		      int kern);
33 
34 /*
35  * Note: since all this is still nicely synchronized with the signaling demon,
36  *       there's no need to protect sleep loops with clis. If signaling is
37  *       moved into the kernel, that would change.
38  */
39 
40 
41 static int svc_shutdown(struct socket *sock, int how)
42 {
43 	return 0;
44 }
45 
46 static void svc_disconnect(struct atm_vcc *vcc)
47 {
48 	DEFINE_WAIT(wait);
49 	struct sk_buff *skb;
50 	struct sock *sk = sk_atm(vcc);
51 
52 	pr_debug("%p\n", vcc);
53 	if (test_bit(ATM_VF_REGIS, &vcc->flags)) {
54 		sigd_enq(vcc, as_close, NULL, NULL, NULL);
55 		for (;;) {
56 			prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
57 			if (test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd)
58 				break;
59 			schedule();
60 		}
61 		finish_wait(sk_sleep(sk), &wait);
62 	}
63 	/* beware - socket is still in use by atmsigd until the last
64 	   as_indicate has been answered */
65 	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
66 		atm_return(vcc, skb->truesize);
67 		pr_debug("LISTEN REL\n");
68 		sigd_enq2(NULL, as_reject, vcc, NULL, NULL, &vcc->qos, 0);
69 		dev_kfree_skb(skb);
70 	}
71 	clear_bit(ATM_VF_REGIS, &vcc->flags);
72 	/* ... may retry later */
73 }
74 
75 static int svc_release(struct socket *sock)
76 {
77 	struct sock *sk = sock->sk;
78 	struct atm_vcc *vcc;
79 
80 	if (sk) {
81 		vcc = ATM_SD(sock);
82 		pr_debug("%p\n", vcc);
83 		clear_bit(ATM_VF_READY, &vcc->flags);
84 		/*
85 		 * VCC pointer is used as a reference,
86 		 * so we must not free it (thereby subjecting it to re-use)
87 		 * before all pending connections are closed
88 		 */
89 		svc_disconnect(vcc);
90 		vcc_release(sock);
91 	}
92 	return 0;
93 }
94 
95 static int svc_bind(struct socket *sock, struct sockaddr *sockaddr,
96 		    int sockaddr_len)
97 {
98 	DEFINE_WAIT(wait);
99 	struct sock *sk = sock->sk;
100 	struct sockaddr_atmsvc *addr;
101 	struct atm_vcc *vcc;
102 	int error;
103 
104 	if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
105 		return -EINVAL;
106 	lock_sock(sk);
107 	if (sock->state == SS_CONNECTED) {
108 		error = -EISCONN;
109 		goto out;
110 	}
111 	if (sock->state != SS_UNCONNECTED) {
112 		error = -EINVAL;
113 		goto out;
114 	}
115 	vcc = ATM_SD(sock);
116 	addr = (struct sockaddr_atmsvc *) sockaddr;
117 	if (addr->sas_family != AF_ATMSVC) {
118 		error = -EAFNOSUPPORT;
119 		goto out;
120 	}
121 	clear_bit(ATM_VF_BOUND, &vcc->flags);
122 	    /* failing rebind will kill old binding */
123 	/* @@@ check memory (de)allocation on rebind */
124 	if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
125 		error = -EBADFD;
126 		goto out;
127 	}
128 	vcc->local = *addr;
129 	set_bit(ATM_VF_WAITING, &vcc->flags);
130 	sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local);
131 	for (;;) {
132 		prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
133 		if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
134 			break;
135 		schedule();
136 	}
137 	finish_wait(sk_sleep(sk), &wait);
138 	clear_bit(ATM_VF_REGIS, &vcc->flags); /* doesn't count */
139 	if (!sigd) {
140 		error = -EUNATCH;
141 		goto out;
142 	}
143 	if (!sk->sk_err)
144 		set_bit(ATM_VF_BOUND, &vcc->flags);
145 	error = -sk->sk_err;
146 out:
147 	release_sock(sk);
148 	return error;
149 }
150 
151 static int svc_connect(struct socket *sock, struct sockaddr *sockaddr,
152 		       int sockaddr_len, int flags)
153 {
154 	DEFINE_WAIT(wait);
155 	struct sock *sk = sock->sk;
156 	struct sockaddr_atmsvc *addr;
157 	struct atm_vcc *vcc = ATM_SD(sock);
158 	int error;
159 
160 	pr_debug("%p\n", vcc);
161 	lock_sock(sk);
162 	if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
163 		error = -EINVAL;
164 		goto out;
165 	}
166 
167 	switch (sock->state) {
168 	default:
169 		error = -EINVAL;
170 		goto out;
171 	case SS_CONNECTED:
172 		error = -EISCONN;
173 		goto out;
174 	case SS_CONNECTING:
175 		if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
176 			error = -EALREADY;
177 			goto out;
178 		}
179 		sock->state = SS_UNCONNECTED;
180 		if (sk->sk_err) {
181 			error = -sk->sk_err;
182 			goto out;
183 		}
184 		break;
185 	case SS_UNCONNECTED:
186 		addr = (struct sockaddr_atmsvc *) sockaddr;
187 		if (addr->sas_family != AF_ATMSVC) {
188 			error = -EAFNOSUPPORT;
189 			goto out;
190 		}
191 		if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
192 			error = -EBADFD;
193 			goto out;
194 		}
195 		if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
196 		    vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
197 			error = -EINVAL;
198 			goto out;
199 		}
200 		if (!vcc->qos.txtp.traffic_class &&
201 		    !vcc->qos.rxtp.traffic_class) {
202 			error = -EINVAL;
203 			goto out;
204 		}
205 		vcc->remote = *addr;
206 		set_bit(ATM_VF_WAITING, &vcc->flags);
207 		sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote);
208 		if (flags & O_NONBLOCK) {
209 			sock->state = SS_CONNECTING;
210 			error = -EINPROGRESS;
211 			goto out;
212 		}
213 		error = 0;
214 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
215 		while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
216 			schedule();
217 			if (!signal_pending(current)) {
218 				prepare_to_wait(sk_sleep(sk), &wait,
219 						TASK_INTERRUPTIBLE);
220 				continue;
221 			}
222 			pr_debug("*ABORT*\n");
223 			/*
224 			 * This is tricky:
225 			 *   Kernel ---close--> Demon
226 			 *   Kernel <--close--- Demon
227 			 * or
228 			 *   Kernel ---close--> Demon
229 			 *   Kernel <--error--- Demon
230 			 * or
231 			 *   Kernel ---close--> Demon
232 			 *   Kernel <--okay---- Demon
233 			 *   Kernel <--close--- Demon
234 			 */
235 			sigd_enq(vcc, as_close, NULL, NULL, NULL);
236 			while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
237 				prepare_to_wait(sk_sleep(sk), &wait,
238 						TASK_INTERRUPTIBLE);
239 				schedule();
240 			}
241 			if (!sk->sk_err)
242 				while (!test_bit(ATM_VF_RELEASED, &vcc->flags) &&
243 				       sigd) {
244 					prepare_to_wait(sk_sleep(sk), &wait,
245 							TASK_INTERRUPTIBLE);
246 					schedule();
247 				}
248 			clear_bit(ATM_VF_REGIS, &vcc->flags);
249 			clear_bit(ATM_VF_RELEASED, &vcc->flags);
250 			clear_bit(ATM_VF_CLOSE, &vcc->flags);
251 			    /* we're gone now but may connect later */
252 			error = -EINTR;
253 			break;
254 		}
255 		finish_wait(sk_sleep(sk), &wait);
256 		if (error)
257 			goto out;
258 		if (!sigd) {
259 			error = -EUNATCH;
260 			goto out;
261 		}
262 		if (sk->sk_err) {
263 			error = -sk->sk_err;
264 			goto out;
265 		}
266 	}
267 
268 	vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
269 	vcc->qos.txtp.pcr = 0;
270 	vcc->qos.txtp.min_pcr = 0;
271 
272 	error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci);
273 	if (!error)
274 		sock->state = SS_CONNECTED;
275 	else
276 		(void)svc_disconnect(vcc);
277 out:
278 	release_sock(sk);
279 	return error;
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("%p\n", vcc);
290 	lock_sock(sk);
291 	/* let server handle listen on unbound sockets */
292 	if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
293 		error = -EINVAL;
294 		goto out;
295 	}
296 	if (test_bit(ATM_VF_LISTEN, &vcc->flags)) {
297 		error = -EADDRINUSE;
298 		goto out;
299 	}
300 	set_bit(ATM_VF_WAITING, &vcc->flags);
301 	sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local);
302 	for (;;) {
303 		prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
304 		if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
305 			break;
306 		schedule();
307 	}
308 	finish_wait(sk_sleep(sk), &wait);
309 	if (!sigd) {
310 		error = -EUNATCH;
311 		goto out;
312 	}
313 	set_bit(ATM_VF_LISTEN, &vcc->flags);
314 	vcc_insert_socket(sk);
315 	sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
316 	error = -sk->sk_err;
317 out:
318 	release_sock(sk);
319 	return error;
320 }
321 
322 static int svc_accept(struct socket *sock, struct socket *newsock, int flags,
323 		      bool kern)
324 {
325 	struct sock *sk = sock->sk;
326 	struct sk_buff *skb;
327 	struct atmsvc_msg *msg;
328 	struct atm_vcc *old_vcc = ATM_SD(sock);
329 	struct atm_vcc *new_vcc;
330 	int error;
331 
332 	lock_sock(sk);
333 
334 	error = svc_create(sock_net(sk), newsock, 0, kern);
335 	if (error)
336 		goto out;
337 
338 	new_vcc = ATM_SD(newsock);
339 
340 	pr_debug("%p -> %p\n", old_vcc, new_vcc);
341 	while (1) {
342 		DEFINE_WAIT(wait);
343 
344 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
345 		while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
346 		       sigd) {
347 			if (test_bit(ATM_VF_RELEASED, &old_vcc->flags))
348 				break;
349 			if (test_bit(ATM_VF_CLOSE, &old_vcc->flags)) {
350 				error = -sk->sk_err;
351 				break;
352 			}
353 			if (flags & O_NONBLOCK) {
354 				error = -EAGAIN;
355 				break;
356 			}
357 			release_sock(sk);
358 			schedule();
359 			lock_sock(sk);
360 			if (signal_pending(current)) {
361 				error = -ERESTARTSYS;
362 				break;
363 			}
364 			prepare_to_wait(sk_sleep(sk), &wait,
365 					TASK_INTERRUPTIBLE);
366 		}
367 		finish_wait(sk_sleep(sk), &wait);
368 		if (error)
369 			goto out;
370 		if (!skb) {
371 			error = -EUNATCH;
372 			goto out;
373 		}
374 		msg = (struct atmsvc_msg *)skb->data;
375 		new_vcc->qos = msg->qos;
376 		set_bit(ATM_VF_HASQOS, &new_vcc->flags);
377 		new_vcc->remote = msg->svc;
378 		new_vcc->local = msg->local;
379 		new_vcc->sap = msg->sap;
380 		error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
381 				    msg->pvc.sap_addr.vpi,
382 				    msg->pvc.sap_addr.vci);
383 		dev_kfree_skb(skb);
384 		sk_acceptq_removed(sk);
385 		if (error) {
386 			sigd_enq2(NULL, as_reject, old_vcc, NULL, NULL,
387 				  &old_vcc->qos, error);
388 			error = error == -EAGAIN ? -EBUSY : error;
389 			goto out;
390 		}
391 		/* wait should be short, so we ignore the non-blocking flag */
392 		set_bit(ATM_VF_WAITING, &new_vcc->flags);
393 		sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL);
394 		for (;;) {
395 			prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
396 					TASK_UNINTERRUPTIBLE);
397 			if (!test_bit(ATM_VF_WAITING, &new_vcc->flags) || !sigd)
398 				break;
399 			release_sock(sk);
400 			schedule();
401 			lock_sock(sk);
402 		}
403 		finish_wait(sk_sleep(sk_atm(new_vcc)), &wait);
404 		if (!sigd) {
405 			error = -EUNATCH;
406 			goto out;
407 		}
408 		if (!sk_atm(new_vcc)->sk_err)
409 			break;
410 		if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
411 			error = -sk_atm(new_vcc)->sk_err;
412 			goto out;
413 		}
414 	}
415 	newsock->state = SS_CONNECTED;
416 out:
417 	release_sock(sk);
418 	return error;
419 }
420 
421 static int svc_getname(struct socket *sock, struct sockaddr *sockaddr,
422 		       int peer)
423 {
424 	struct sockaddr_atmsvc *addr;
425 
426 	addr = (struct sockaddr_atmsvc *) sockaddr;
427 	memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
428 	       sizeof(struct sockaddr_atmsvc));
429 	return sizeof(struct sockaddr_atmsvc);
430 }
431 
432 int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
433 {
434 	struct sock *sk = sk_atm(vcc);
435 	DEFINE_WAIT(wait);
436 
437 	set_bit(ATM_VF_WAITING, &vcc->flags);
438 	sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0);
439 	for (;;) {
440 		prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
441 		if (!test_bit(ATM_VF_WAITING, &vcc->flags) ||
442 		    test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd) {
443 			break;
444 		}
445 		schedule();
446 	}
447 	finish_wait(sk_sleep(sk), &wait);
448 	if (!sigd)
449 		return -EUNATCH;
450 	return -sk->sk_err;
451 }
452 
453 static int svc_setsockopt(struct socket *sock, int level, int optname,
454 			  sockptr_t optval, unsigned int optlen)
455 {
456 	struct sock *sk = sock->sk;
457 	struct atm_vcc *vcc = ATM_SD(sock);
458 	int value, error = 0;
459 
460 	lock_sock(sk);
461 	switch (optname) {
462 	case SO_ATMSAP:
463 		if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
464 			error = -EINVAL;
465 			goto out;
466 		}
467 		if (copy_from_sockptr(&vcc->sap, optval, optlen)) {
468 			error = -EFAULT;
469 			goto out;
470 		}
471 		set_bit(ATM_VF_HASSAP, &vcc->flags);
472 		break;
473 	case SO_MULTIPOINT:
474 		if (level != SOL_ATM || optlen != sizeof(int)) {
475 			error = -EINVAL;
476 			goto out;
477 		}
478 		if (copy_from_sockptr(&value, optval, sizeof(int))) {
479 			error = -EFAULT;
480 			goto out;
481 		}
482 		if (value == 1)
483 			set_bit(ATM_VF_SESSION, &vcc->flags);
484 		else if (value == 0)
485 			clear_bit(ATM_VF_SESSION, &vcc->flags);
486 		else
487 			error = -EINVAL;
488 		break;
489 	default:
490 		error = vcc_setsockopt(sock, level, optname, optval, optlen);
491 	}
492 
493 out:
494 	release_sock(sk);
495 	return error;
496 }
497 
498 static int svc_getsockopt(struct socket *sock, int level, int optname,
499 			  char __user *optval, int __user *optlen)
500 {
501 	struct sock *sk = sock->sk;
502 	int error = 0, len;
503 
504 	lock_sock(sk);
505 	if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
506 		error = vcc_getsockopt(sock, level, optname, optval, optlen);
507 		goto out;
508 	}
509 	if (get_user(len, optlen)) {
510 		error = -EFAULT;
511 		goto out;
512 	}
513 	if (len != sizeof(struct atm_sap)) {
514 		error = -EINVAL;
515 		goto out;
516 	}
517 	if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
518 		error = -EFAULT;
519 		goto out;
520 	}
521 out:
522 	release_sock(sk);
523 	return error;
524 }
525 
526 static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
527 			int sockaddr_len, int flags)
528 {
529 	DEFINE_WAIT(wait);
530 	struct sock *sk = sock->sk;
531 	struct atm_vcc *vcc = ATM_SD(sock);
532 	int error;
533 
534 	lock_sock(sk);
535 	set_bit(ATM_VF_WAITING, &vcc->flags);
536 	sigd_enq(vcc, as_addparty, NULL, NULL,
537 		 (struct sockaddr_atmsvc *) sockaddr);
538 	if (flags & O_NONBLOCK) {
539 		error = -EINPROGRESS;
540 		goto out;
541 	}
542 	pr_debug("added wait queue\n");
543 	for (;;) {
544 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
545 		if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
546 			break;
547 		schedule();
548 	}
549 	finish_wait(sk_sleep(sk), &wait);
550 	error = -xchg(&sk->sk_err_soft, 0);
551 out:
552 	release_sock(sk);
553 	return error;
554 }
555 
556 static int svc_dropparty(struct socket *sock, int ep_ref)
557 {
558 	DEFINE_WAIT(wait);
559 	struct sock *sk = sock->sk;
560 	struct atm_vcc *vcc = ATM_SD(sock);
561 	int error;
562 
563 	lock_sock(sk);
564 	set_bit(ATM_VF_WAITING, &vcc->flags);
565 	sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
566 	for (;;) {
567 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
568 		if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
569 			break;
570 		schedule();
571 	}
572 	finish_wait(sk_sleep(sk), &wait);
573 	if (!sigd) {
574 		error = -EUNATCH;
575 		goto out;
576 	}
577 	error = -xchg(&sk->sk_err_soft, 0);
578 out:
579 	release_sock(sk);
580 	return error;
581 }
582 
583 static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
584 {
585 	int error, ep_ref;
586 	struct sockaddr_atmsvc sa;
587 	struct atm_vcc *vcc = ATM_SD(sock);
588 
589 	switch (cmd) {
590 	case ATM_ADDPARTY:
591 		if (!test_bit(ATM_VF_SESSION, &vcc->flags))
592 			return -EINVAL;
593 		if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
594 			return -EFAULT;
595 		error = svc_addparty(sock, (struct sockaddr *)&sa, sizeof(sa),
596 				     0);
597 		break;
598 	case ATM_DROPPARTY:
599 		if (!test_bit(ATM_VF_SESSION, &vcc->flags))
600 			return -EINVAL;
601 		if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
602 			return -EFAULT;
603 		error = svc_dropparty(sock, ep_ref);
604 		break;
605 	default:
606 		error = vcc_ioctl(sock, cmd, arg);
607 	}
608 
609 	return error;
610 }
611 
612 #ifdef CONFIG_COMPAT
613 static int svc_compat_ioctl(struct socket *sock, unsigned int cmd,
614 			    unsigned long arg)
615 {
616 	/* The definition of ATM_ADDPARTY uses the size of struct atm_iobuf.
617 	   But actually it takes a struct sockaddr_atmsvc, which doesn't need
618 	   compat handling. So all we have to do is fix up cmd... */
619 	if (cmd == COMPAT_ATM_ADDPARTY)
620 		cmd = ATM_ADDPARTY;
621 
622 	if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY)
623 		return svc_ioctl(sock, cmd, arg);
624 	else
625 		return vcc_compat_ioctl(sock, cmd, arg);
626 }
627 #endif /* CONFIG_COMPAT */
628 
629 static const struct proto_ops svc_proto_ops = {
630 	.family =	PF_ATMSVC,
631 	.owner =	THIS_MODULE,
632 
633 	.release =	svc_release,
634 	.bind =		svc_bind,
635 	.connect =	svc_connect,
636 	.socketpair =	sock_no_socketpair,
637 	.accept =	svc_accept,
638 	.getname =	svc_getname,
639 	.poll =		vcc_poll,
640 	.ioctl =	svc_ioctl,
641 #ifdef CONFIG_COMPAT
642 	.compat_ioctl =	svc_compat_ioctl,
643 #endif
644 	.gettstamp =	sock_gettstamp,
645 	.listen =	svc_listen,
646 	.shutdown =	svc_shutdown,
647 	.setsockopt =	svc_setsockopt,
648 	.getsockopt =	svc_getsockopt,
649 	.sendmsg =	vcc_sendmsg,
650 	.recvmsg =	vcc_recvmsg,
651 	.mmap =		sock_no_mmap,
652 	.sendpage =	sock_no_sendpage,
653 };
654 
655 
656 static int svc_create(struct net *net, struct socket *sock, int protocol,
657 		      int kern)
658 {
659 	int error;
660 
661 	if (!net_eq(net, &init_net))
662 		return -EAFNOSUPPORT;
663 
664 	sock->ops = &svc_proto_ops;
665 	error = vcc_create(net, sock, protocol, AF_ATMSVC, kern);
666 	if (error)
667 		return error;
668 	ATM_SD(sock)->local.sas_family = AF_ATMSVC;
669 	ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
670 	return 0;
671 }
672 
673 static const struct net_proto_family svc_family_ops = {
674 	.family = PF_ATMSVC,
675 	.create = svc_create,
676 	.owner = THIS_MODULE,
677 };
678 
679 
680 /*
681  *	Initialize the ATM SVC protocol family
682  */
683 
684 int __init atmsvc_init(void)
685 {
686 	return sock_register(&svc_family_ops);
687 }
688 
689 void atmsvc_exit(void)
690 {
691 	sock_unregister(PF_ATMSVC);
692 }
693