1 /* net/atm/svc.c - ATM SVC sockets */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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>
23 #include "resources.h"
24 #include "common.h" /* common for PVCs and SVCs */
25 #include "signaling.h"
30 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
32 #define DPRINTK(format,args...)
36 static int svc_create(struct socket *sock,int protocol);
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.
46 static int svc_shutdown(struct socket *sock,int how)
52 static void svc_disconnect(struct atm_vcc *vcc)
57 DPRINTK("svc_disconnect %p\n",vcc);
58 if (test_bit(ATM_VF_REGIS,&vcc->flags)) {
59 prepare_to_wait(vcc->sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
60 sigd_enq(vcc,as_close,NULL,NULL,NULL);
61 while (!test_bit(ATM_VF_RELEASED,&vcc->flags) && sigd) {
63 prepare_to_wait(vcc->sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
65 finish_wait(vcc->sk->sk_sleep, &wait);
67 /* beware - socket is still in use by atmsigd until the last
68 as_indicate has been answered */
69 while ((skb = skb_dequeue(&vcc->sk->sk_receive_queue))) {
70 DPRINTK("LISTEN REL\n");
71 sigd_enq2(NULL,as_reject,vcc,NULL,NULL,&vcc->qos,0);
74 clear_bit(ATM_VF_REGIS,&vcc->flags);
75 clear_bit(ATM_VF_RELEASED,&vcc->flags);
76 clear_bit(ATM_VF_CLOSE,&vcc->flags);
77 /* ... may retry later */
81 static int svc_release(struct socket *sock)
83 struct sock *sk = sock->sk;
88 DPRINTK("svc_release %p\n", vcc);
89 clear_bit(ATM_VF_READY, &vcc->flags);
90 /* VCC pointer is used as a reference, so we must not free it
91 (thereby subjecting it to re-use) before all pending connections
102 static int svc_bind(struct socket *sock,struct sockaddr *sockaddr,
106 struct sock *sk = sock->sk;
107 struct sockaddr_atmsvc *addr;
111 if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
114 if (sock->state == SS_CONNECTED) {
118 if (sock->state != SS_UNCONNECTED) {
123 if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
127 addr = (struct sockaddr_atmsvc *) sockaddr;
128 if (addr->sas_family != AF_ATMSVC) {
129 error = -EAFNOSUPPORT;
132 clear_bit(ATM_VF_BOUND,&vcc->flags);
133 /* failing rebind will kill old binding */
134 /* @@@ check memory (de)allocation on rebind */
135 if (!test_bit(ATM_VF_HASQOS,&vcc->flags)) {
140 set_bit(ATM_VF_WAITING, &vcc->flags);
141 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
142 sigd_enq(vcc,as_bind,NULL,NULL,&vcc->local);
143 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
145 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
147 finish_wait(sk->sk_sleep, &wait);
148 clear_bit(ATM_VF_REGIS,&vcc->flags); /* doesn't count */
154 set_bit(ATM_VF_BOUND,&vcc->flags);
162 static int svc_connect(struct socket *sock,struct sockaddr *sockaddr,
163 int sockaddr_len,int flags)
166 struct sock *sk = sock->sk;
167 struct sockaddr_atmsvc *addr;
168 struct atm_vcc *vcc = ATM_SD(sock);
171 DPRINTK("svc_connect %p\n",vcc);
173 if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
178 switch (sock->state) {
186 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
190 sock->state = SS_UNCONNECTED;
197 if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
201 addr = (struct sockaddr_atmsvc *) sockaddr;
202 if (addr->sas_family != AF_ATMSVC) {
203 error = -EAFNOSUPPORT;
206 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
210 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
211 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
215 if (!vcc->qos.txtp.traffic_class &&
216 !vcc->qos.rxtp.traffic_class) {
221 set_bit(ATM_VF_WAITING, &vcc->flags);
222 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
223 sigd_enq(vcc,as_connect,NULL,NULL,&vcc->remote);
224 if (flags & O_NONBLOCK) {
225 finish_wait(sk->sk_sleep, &wait);
226 sock->state = SS_CONNECTING;
227 error = -EINPROGRESS;
231 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
233 if (!signal_pending(current)) {
234 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
237 DPRINTK("*ABORT*\n");
240 * Kernel ---close--> Demon
241 * Kernel <--close--- Demon
243 * Kernel ---close--> Demon
244 * Kernel <--error--- Demon
246 * Kernel ---close--> Demon
247 * Kernel <--okay---- Demon
248 * Kernel <--close--- Demon
250 sigd_enq(vcc,as_close,NULL,NULL,NULL);
251 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
252 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
256 while (!test_bit(ATM_VF_RELEASED,&vcc->flags)
258 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
261 clear_bit(ATM_VF_REGIS,&vcc->flags);
262 clear_bit(ATM_VF_RELEASED,&vcc->flags);
263 clear_bit(ATM_VF_CLOSE,&vcc->flags);
264 /* we're gone now but may connect later */
268 finish_wait(sk->sk_sleep, &wait);
283 * #ifndef CONFIG_SINGLE_SIGITF
285 vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
286 vcc->qos.txtp.pcr = 0;
287 vcc->qos.txtp.min_pcr = 0;
291 if (!(error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci)))
292 sock->state = SS_CONNECTED;
293 else (void) svc_disconnect(vcc);
300 static int svc_listen(struct socket *sock,int backlog)
303 struct sock *sk = sock->sk;
304 struct atm_vcc *vcc = ATM_SD(sock);
307 DPRINTK("svc_listen %p\n",vcc);
309 /* let server handle listen on unbound sockets */
310 if (test_bit(ATM_VF_SESSION,&vcc->flags)) {
314 set_bit(ATM_VF_WAITING, &vcc->flags);
315 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
316 sigd_enq(vcc,as_listen,NULL,NULL,&vcc->local);
317 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
319 prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
321 finish_wait(sk->sk_sleep, &wait);
326 set_bit(ATM_VF_LISTEN,&vcc->flags);
327 vcc->sk->sk_max_ack_backlog = backlog > 0 ? backlog :
336 static int svc_accept(struct socket *sock,struct socket *newsock,int flags)
338 struct sock *sk = sock->sk;
340 struct atmsvc_msg *msg;
341 struct atm_vcc *old_vcc = ATM_SD(sock);
342 struct atm_vcc *new_vcc;
347 error = svc_create(newsock,0);
351 new_vcc = ATM_SD(newsock);
353 DPRINTK("svc_accept %p -> %p\n",old_vcc,new_vcc);
357 prepare_to_wait(old_vcc->sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
358 while (!(skb = skb_dequeue(&old_vcc->sk->sk_receive_queue)) &&
360 if (test_bit(ATM_VF_RELEASED,&old_vcc->flags)) break;
361 if (test_bit(ATM_VF_CLOSE,&old_vcc->flags)) {
365 if (flags & O_NONBLOCK) {
372 if (signal_pending(current)) {
373 error = -ERESTARTSYS;
376 prepare_to_wait(old_vcc->sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
378 finish_wait(old_vcc->sk->sk_sleep, &wait);
385 msg = (struct atmsvc_msg *) skb->data;
386 new_vcc->qos = msg->qos;
387 set_bit(ATM_VF_HASQOS,&new_vcc->flags);
388 new_vcc->remote = msg->svc;
389 new_vcc->local = msg->local;
390 new_vcc->sap = msg->sap;
391 error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
392 msg->pvc.sap_addr.vpi, msg->pvc.sap_addr.vci);
394 old_vcc->sk->sk_ack_backlog--;
396 sigd_enq2(NULL,as_reject,old_vcc,NULL,NULL,
397 &old_vcc->qos,error);
398 error = error == -EAGAIN ? -EBUSY : error;
401 /* wait should be short, so we ignore the non-blocking flag */
402 set_bit(ATM_VF_WAITING, &new_vcc->flags);
403 prepare_to_wait(new_vcc->sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
404 sigd_enq(new_vcc,as_accept,old_vcc,NULL,NULL);
405 while (test_bit(ATM_VF_WAITING, &new_vcc->flags) && sigd) {
409 prepare_to_wait(new_vcc->sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
411 finish_wait(new_vcc->sk->sk_sleep, &wait);
416 if (!new_vcc->sk->sk_err)
418 if (new_vcc->sk->sk_err != ERESTARTSYS) {
419 error = -new_vcc->sk->sk_err;
423 newsock->state = SS_CONNECTED;
430 static int svc_getname(struct socket *sock,struct sockaddr *sockaddr,
431 int *sockaddr_len,int peer)
433 struct sockaddr_atmsvc *addr;
435 *sockaddr_len = sizeof(struct sockaddr_atmsvc);
436 addr = (struct sockaddr_atmsvc *) sockaddr;
437 memcpy(addr,peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
438 sizeof(struct sockaddr_atmsvc));
443 int svc_change_qos(struct atm_vcc *vcc,struct atm_qos *qos)
447 set_bit(ATM_VF_WAITING, &vcc->flags);
448 prepare_to_wait(vcc->sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
449 sigd_enq2(vcc,as_modify,NULL,NULL,&vcc->local,qos,0);
450 while (test_bit(ATM_VF_WAITING, &vcc->flags) &&
451 !test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) {
453 prepare_to_wait(vcc->sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
455 finish_wait(vcc->sk->sk_sleep, &wait);
456 if (!sigd) return -EUNATCH;
457 return -vcc->sk->sk_err;
461 static int svc_setsockopt(struct socket *sock,int level,int optname,
462 char __user *optval,int optlen)
464 struct sock *sk = sock->sk;
468 if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP ||
469 optlen != sizeof(struct atm_sap)) {
470 error = vcc_setsockopt(sock, level, optname, optval, optlen);
474 if (copy_from_user(&vcc->sap, optval, optlen)) {
478 set_bit(ATM_VF_HASSAP, &vcc->flags);
485 static int svc_getsockopt(struct socket *sock,int level,int optname,
486 char __user *optval,int __user *optlen)
488 struct sock *sk = sock->sk;
492 if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
493 error = vcc_getsockopt(sock, level, optname, optval, optlen);
496 if (get_user(len, optlen)) {
500 if (len != sizeof(struct atm_sap)) {
504 if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
514 static struct proto_ops svc_proto_ops = {
516 .owner = THIS_MODULE,
518 .release = svc_release,
520 .connect = svc_connect,
521 .socketpair = sock_no_socketpair,
522 .accept = svc_accept,
523 .getname = svc_getname,
526 .listen = svc_listen,
527 .shutdown = svc_shutdown,
528 .setsockopt = svc_setsockopt,
529 .getsockopt = svc_getsockopt,
530 .sendmsg = vcc_sendmsg,
531 .recvmsg = vcc_recvmsg,
532 .mmap = sock_no_mmap,
533 .sendpage = sock_no_sendpage,
537 static int svc_create(struct socket *sock,int protocol)
541 sock->ops = &svc_proto_ops;
542 error = vcc_create(sock, protocol, AF_ATMSVC);
543 if (error) return error;
544 ATM_SD(sock)->local.sas_family = AF_ATMSVC;
545 ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
550 static struct net_proto_family svc_family_ops = {
552 .create = svc_create,
553 .owner = THIS_MODULE,
558 * Initialize the ATM SVC protocol family
561 int __init atmsvc_init(void)
563 return sock_register(&svc_family_ops);
566 void atmsvc_exit(void)
568 sock_unregister(PF_ATMSVC);