1 /* net/atm/svc.c - ATM SVC sockets */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
5 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
7 #include <linux/string.h>
8 #include <linux/net.h> /* struct socket, struct proto_ops */
9 #include <linux/errno.h> /* error codes */
10 #include <linux/kernel.h> /* printk */
11 #include <linux/skbuff.h>
12 #include <linux/wait.h>
13 #include <linux/sched/signal.h>
14 #include <linux/fcntl.h> /* O_NONBLOCK */
15 #include <linux/init.h>
16 #include <linux/atm.h> /* ATM stuff */
17 #include <linux/atmsap.h>
18 #include <linux/atmsvc.h>
19 #include <linux/atmdev.h>
20 #include <linux/bitops.h>
21 #include <net/sock.h> /* for sock_no_* */
22 #include <linux/uaccess.h>
23 #include <linux/export.h>
25 #include "resources.h"
26 #include "common.h" /* common for PVCs and SVCs */
27 #include "signaling.h"
30 static int svc_create(struct net *net, struct socket *sock, int protocol,
34 * Note: since all this is still nicely synchronized with the signaling demon,
35 * there's no need to protect sleep loops with clis. If signaling is
36 * moved into the kernel, that would change.
40 static int svc_shutdown(struct socket *sock, int how)
45 static void svc_disconnect(struct atm_vcc *vcc)
49 struct sock *sk = sk_atm(vcc);
51 pr_debug("%p\n", vcc);
52 if (test_bit(ATM_VF_REGIS, &vcc->flags)) {
53 sigd_enq(vcc, as_close, NULL, NULL, NULL);
55 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
56 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd)
60 finish_wait(sk_sleep(sk), &wait);
62 /* beware - socket is still in use by atmsigd until the last
63 as_indicate has been answered */
64 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
65 atm_return(vcc, skb->truesize);
66 pr_debug("LISTEN REL\n");
67 sigd_enq2(NULL, as_reject, vcc, NULL, NULL, &vcc->qos, 0);
70 clear_bit(ATM_VF_REGIS, &vcc->flags);
71 /* ... may retry later */
74 static int svc_release(struct socket *sock)
76 struct sock *sk = sock->sk;
81 pr_debug("%p\n", vcc);
82 clear_bit(ATM_VF_READY, &vcc->flags);
84 * VCC pointer is used as a reference,
85 * so we must not free it (thereby subjecting it to re-use)
86 * before all pending connections are closed
94 static int svc_bind(struct socket *sock, struct sockaddr *sockaddr,
98 struct sock *sk = sock->sk;
99 struct sockaddr_atmsvc *addr;
103 if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
106 if (sock->state == SS_CONNECTED) {
110 if (sock->state != SS_UNCONNECTED) {
115 addr = (struct sockaddr_atmsvc *) sockaddr;
116 if (addr->sas_family != AF_ATMSVC) {
117 error = -EAFNOSUPPORT;
120 clear_bit(ATM_VF_BOUND, &vcc->flags);
121 /* failing rebind will kill old binding */
122 /* @@@ check memory (de)allocation on rebind */
123 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
128 set_bit(ATM_VF_WAITING, &vcc->flags);
129 sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local);
131 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
132 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
136 finish_wait(sk_sleep(sk), &wait);
137 clear_bit(ATM_VF_REGIS, &vcc->flags); /* doesn't count */
143 set_bit(ATM_VF_BOUND, &vcc->flags);
150 static int svc_connect(struct socket *sock, struct sockaddr *sockaddr,
151 int sockaddr_len, int flags)
154 struct sock *sk = sock->sk;
155 struct sockaddr_atmsvc *addr;
156 struct atm_vcc *vcc = ATM_SD(sock);
159 pr_debug("%p\n", vcc);
161 if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
166 switch (sock->state) {
174 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
178 sock->state = SS_UNCONNECTED;
185 addr = (struct sockaddr_atmsvc *) sockaddr;
186 if (addr->sas_family != AF_ATMSVC) {
187 error = -EAFNOSUPPORT;
190 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
194 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
195 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
199 if (!vcc->qos.txtp.traffic_class &&
200 !vcc->qos.rxtp.traffic_class) {
205 set_bit(ATM_VF_WAITING, &vcc->flags);
206 sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote);
207 if (flags & O_NONBLOCK) {
208 sock->state = SS_CONNECTING;
209 error = -EINPROGRESS;
213 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
214 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
216 if (!signal_pending(current)) {
217 prepare_to_wait(sk_sleep(sk), &wait,
221 pr_debug("*ABORT*\n");
224 * Kernel ---close--> Demon
225 * Kernel <--close--- Demon
227 * Kernel ---close--> Demon
228 * Kernel <--error--- Demon
230 * Kernel ---close--> Demon
231 * Kernel <--okay---- Demon
232 * Kernel <--close--- Demon
234 sigd_enq(vcc, as_close, NULL, NULL, NULL);
235 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
236 prepare_to_wait(sk_sleep(sk), &wait,
241 while (!test_bit(ATM_VF_RELEASED, &vcc->flags) &&
243 prepare_to_wait(sk_sleep(sk), &wait,
247 clear_bit(ATM_VF_REGIS, &vcc->flags);
248 clear_bit(ATM_VF_RELEASED, &vcc->flags);
249 clear_bit(ATM_VF_CLOSE, &vcc->flags);
250 /* we're gone now but may connect later */
254 finish_wait(sk_sleep(sk), &wait);
267 vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
268 vcc->qos.txtp.pcr = 0;
269 vcc->qos.txtp.min_pcr = 0;
271 error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci);
273 sock->state = SS_CONNECTED;
275 (void)svc_disconnect(vcc);
281 static int svc_listen(struct socket *sock, int backlog)
284 struct sock *sk = sock->sk;
285 struct atm_vcc *vcc = ATM_SD(sock);
288 pr_debug("%p\n", vcc);
290 /* let server handle listen on unbound sockets */
291 if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
295 if (test_bit(ATM_VF_LISTEN, &vcc->flags)) {
299 set_bit(ATM_VF_WAITING, &vcc->flags);
300 sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local);
302 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
303 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
307 finish_wait(sk_sleep(sk), &wait);
312 set_bit(ATM_VF_LISTEN, &vcc->flags);
313 vcc_insert_socket(sk);
314 sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
321 static int svc_accept(struct socket *sock, struct socket *newsock, int flags,
324 struct sock *sk = sock->sk;
326 struct atmsvc_msg *msg;
327 struct atm_vcc *old_vcc = ATM_SD(sock);
328 struct atm_vcc *new_vcc;
333 error = svc_create(sock_net(sk), newsock, 0, kern);
337 new_vcc = ATM_SD(newsock);
339 pr_debug("%p -> %p\n", old_vcc, new_vcc);
343 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
344 while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
346 if (test_bit(ATM_VF_RELEASED, &old_vcc->flags))
348 if (test_bit(ATM_VF_CLOSE, &old_vcc->flags)) {
352 if (flags & O_NONBLOCK) {
359 if (signal_pending(current)) {
360 error = -ERESTARTSYS;
363 prepare_to_wait(sk_sleep(sk), &wait,
366 finish_wait(sk_sleep(sk), &wait);
373 msg = (struct atmsvc_msg *)skb->data;
374 new_vcc->qos = msg->qos;
375 set_bit(ATM_VF_HASQOS, &new_vcc->flags);
376 new_vcc->remote = msg->svc;
377 new_vcc->local = msg->local;
378 new_vcc->sap = msg->sap;
379 error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
380 msg->pvc.sap_addr.vpi,
381 msg->pvc.sap_addr.vci);
383 sk->sk_ack_backlog--;
385 sigd_enq2(NULL, as_reject, old_vcc, NULL, NULL,
386 &old_vcc->qos, error);
387 error = error == -EAGAIN ? -EBUSY : error;
390 /* wait should be short, so we ignore the non-blocking flag */
391 set_bit(ATM_VF_WAITING, &new_vcc->flags);
392 sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL);
394 prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
395 TASK_UNINTERRUPTIBLE);
396 if (!test_bit(ATM_VF_WAITING, &new_vcc->flags) || !sigd)
402 finish_wait(sk_sleep(sk_atm(new_vcc)), &wait);
407 if (!sk_atm(new_vcc)->sk_err)
409 if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
410 error = -sk_atm(new_vcc)->sk_err;
414 newsock->state = SS_CONNECTED;
420 static int svc_getname(struct socket *sock, struct sockaddr *sockaddr,
421 int *sockaddr_len, int peer)
423 struct sockaddr_atmsvc *addr;
425 *sockaddr_len = sizeof(struct sockaddr_atmsvc);
426 addr = (struct sockaddr_atmsvc *) sockaddr;
427 memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
428 sizeof(struct sockaddr_atmsvc));
432 int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
434 struct sock *sk = sk_atm(vcc);
437 set_bit(ATM_VF_WAITING, &vcc->flags);
438 sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0);
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) {
447 finish_wait(sk_sleep(sk), &wait);
453 static int svc_setsockopt(struct socket *sock, int level, int optname,
454 char __user *optval, unsigned int optlen)
456 struct sock *sk = sock->sk;
457 struct atm_vcc *vcc = ATM_SD(sock);
458 int value, error = 0;
463 if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
467 if (copy_from_user(&vcc->sap, optval, optlen)) {
471 set_bit(ATM_VF_HASSAP, &vcc->flags);
474 if (level != SOL_ATM || optlen != sizeof(int)) {
478 if (get_user(value, (int __user *)optval)) {
483 set_bit(ATM_VF_SESSION, &vcc->flags);
485 clear_bit(ATM_VF_SESSION, &vcc->flags);
490 error = vcc_setsockopt(sock, level, optname, optval, optlen);
498 static int svc_getsockopt(struct socket *sock, int level, int optname,
499 char __user *optval, int __user *optlen)
501 struct sock *sk = sock->sk;
505 if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
506 error = vcc_getsockopt(sock, level, optname, optval, optlen);
509 if (get_user(len, optlen)) {
513 if (len != sizeof(struct atm_sap)) {
517 if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
526 static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
527 int sockaddr_len, int flags)
530 struct sock *sk = sock->sk;
531 struct atm_vcc *vcc = ATM_SD(sock);
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;
542 pr_debug("added wait queue\n");
544 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
545 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
549 finish_wait(sk_sleep(sk), &wait);
550 error = -xchg(&sk->sk_err_soft, 0);
556 static int svc_dropparty(struct socket *sock, int ep_ref)
559 struct sock *sk = sock->sk;
560 struct atm_vcc *vcc = ATM_SD(sock);
564 set_bit(ATM_VF_WAITING, &vcc->flags);
565 sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
567 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
568 if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
572 finish_wait(sk_sleep(sk), &wait);
577 error = -xchg(&sk->sk_err_soft, 0);
583 static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
586 struct sockaddr_atmsvc sa;
587 struct atm_vcc *vcc = ATM_SD(sock);
591 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
593 if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
595 error = svc_addparty(sock, (struct sockaddr *)&sa, sizeof(sa),
599 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
601 if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
603 error = svc_dropparty(sock, ep_ref);
606 error = vcc_ioctl(sock, cmd, arg);
613 static int svc_compat_ioctl(struct socket *sock, unsigned int cmd,
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)
622 if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY)
623 return svc_ioctl(sock, cmd, arg);
625 return vcc_compat_ioctl(sock, cmd, arg);
627 #endif /* CONFIG_COMPAT */
629 static const struct proto_ops svc_proto_ops = {
631 .owner = THIS_MODULE,
633 .release = svc_release,
635 .connect = svc_connect,
636 .socketpair = sock_no_socketpair,
637 .accept = svc_accept,
638 .getname = svc_getname,
642 .compat_ioctl = svc_compat_ioctl,
644 .listen = svc_listen,
645 .shutdown = svc_shutdown,
646 .setsockopt = svc_setsockopt,
647 .getsockopt = svc_getsockopt,
648 .sendmsg = vcc_sendmsg,
649 .recvmsg = vcc_recvmsg,
650 .mmap = sock_no_mmap,
651 .sendpage = sock_no_sendpage,
655 static int svc_create(struct net *net, struct socket *sock, int protocol,
660 if (!net_eq(net, &init_net))
661 return -EAFNOSUPPORT;
663 sock->ops = &svc_proto_ops;
664 error = vcc_create(net, sock, protocol, AF_ATMSVC, kern);
667 ATM_SD(sock)->local.sas_family = AF_ATMSVC;
668 ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
672 static const struct net_proto_family svc_family_ops = {
674 .create = svc_create,
675 .owner = THIS_MODULE,
680 * Initialize the ATM SVC protocol family
683 int __init atmsvc_init(void)
685 return sock_register(&svc_family_ops);
688 void atmsvc_exit(void)
690 sock_unregister(PF_ATMSVC);