xref: /openbmc/linux/net/atm/svc.c (revision dc97391e)
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 
svc_shutdown(struct socket * sock,int how)46 static int svc_shutdown(struct socket *sock, int how)
47 {
48 	return 0;
49 }
50 
svc_disconnect(struct atm_vcc * vcc)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 
svc_release(struct socket * sock)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 
svc_bind(struct socket * sock,struct sockaddr * sockaddr,int sockaddr_len)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 
svc_connect(struct socket * sock,struct sockaddr * sockaddr,int sockaddr_len,int flags)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 
svc_listen(struct socket * sock,int backlog)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 
svc_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)327 static int svc_accept(struct socket *sock, struct socket *newsock, int flags,
328 		      bool kern)
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, 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 (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 
svc_getname(struct socket * sock,struct sockaddr * sockaddr,int peer)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 
svc_change_qos(struct atm_vcc * vcc,struct atm_qos * qos)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 
svc_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)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 
svc_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)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 
svc_addparty(struct socket * sock,struct sockaddr * sockaddr,int sockaddr_len,int flags)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 
svc_dropparty(struct socket * sock,int ep_ref)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 
svc_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)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
svc_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)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 
svc_create(struct net * net,struct socket * sock,int protocol,int kern)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 
atmsvc_init(void)688 int __init atmsvc_init(void)
689 {
690 	return sock_register(&svc_family_ops);
691 }
692 
atmsvc_exit(void)693 void atmsvc_exit(void)
694 {
695 	sock_unregister(PF_ATMSVC);
696 }
697