net/atm/svc.c - pub/scm/linux/kernel/git/tglx/history - Git at Google

 /* net/atm/svc.c - ATM SVC sockets */

 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */


 #include <linux/string.h>
 #include <linux/net.h>		/* struct socket, struct net_proto,
 				   struct proto_ops */
 #include <linux/errno.h>	/* error codes */
 #include <linux/kernel.h>	/* printk */
 #include <linux/skbuff.h>
 #include <linux/wait.h>
 #include <linux/sched.h>	/* jiffies and HZ */
 #include <linux/fcntl.h>	/* O_NONBLOCK */
 #include <linux/init.h>
 #include <linux/atm.h>		/* ATM stuff */
 #include <linux/atmsap.h>
 #include <linux/atmsvc.h>
 #include <linux/atmdev.h>
 #include <linux/bitops.h>
 #include <net/sock.h>		/* for sock_no_* */
 #include <asm/uaccess.h>

 #include "resources.h"
 #include "common.h"		/* common for PVCs and SVCs */
 #include "signaling.h"
 #include "addr.h"


 #if 0
 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
 #else
 #define DPRINTK(format,args...)
 #endif


 static int svc_create(struct socket *sock,int protocol);


 /*
  * Note: since all this is still nicely synchronized with the signaling demon,
  *       there's no need to protect sleep loops with clis. If signaling is
  *       moved into the kernel, that would change.
  */


 void svc_callback(struct atm_vcc *vcc)
 {
 	wake_up(&vcc->sleep);
 }


 static int svc_shutdown(struct socket *sock,int how)
 {
 	return 0;
 }


 static void svc_disconnect(struct atm_vcc *vcc)
 {
 	DECLARE_WAITQUEUE(wait,current);
 	struct sk_buff *skb;

 	DPRINTK("svc_disconnect %p\n",vcc);
 	if (test_bit(ATM_VF_REGIS,&vcc->flags)) {
 		sigd_enq(vcc,as_close,NULL,NULL,NULL);
 		add_wait_queue(&vcc->sleep,&wait);
 		while (!test_bit(ATM_VF_RELEASED,&vcc->flags) && sigd) {
 			set_current_state(TASK_UNINTERRUPTIBLE);
 			schedule();
 		}
 		remove_wait_queue(&vcc->sleep,&wait);
 	}
 	/* beware - socket is still in use by atmsigd until the last
 	   as_indicate has been answered */
 	while ((skb = skb_dequeue(&vcc->listenq))) {
 		DPRINTK("LISTEN REL\n");
 		sigd_enq2(NULL,as_reject,vcc,NULL,NULL,&vcc->qos,0);
 		dev_kfree_skb(skb);
 	}
 	clear_bit(ATM_VF_REGIS,&vcc->flags);
 	clear_bit(ATM_VF_RELEASED,&vcc->flags);
 	clear_bit(ATM_VF_CLOSE,&vcc->flags);
 	/* ... may retry later */
 }


 static int svc_release(struct socket *sock)
 {
 	struct atm_vcc *vcc;

 	if (!sock->sk) return 0;
 	vcc = ATM_SD(sock);
 	DPRINTK("svc_release %p\n",vcc);
 	clear_bit(ATM_VF_READY,&vcc->flags);
 	atm_release_vcc_sk(sock->sk,0);
 	svc_disconnect(vcc);
 	    /* VCC pointer is used as a reference, so we must not free it
 	       (thereby subjecting it to re-use) before all pending connections
 	        are closed */
 	free_atm_vcc_sk(sock->sk);
 	return 0;
 }


 static int svc_bind(struct socket *sock,struct sockaddr *sockaddr,
     int sockaddr_len)
 {
 	DECLARE_WAITQUEUE(wait,current);
 	struct sockaddr_atmsvc *addr;
 	struct atm_vcc *vcc;

 	if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) return -EINVAL;
 	if (sock->state == SS_CONNECTED) return -EISCONN;
 	if (sock->state != SS_UNCONNECTED) return -EINVAL;
 	vcc = ATM_SD(sock);
 	if (test_bit(ATM_VF_SESSION,&vcc->flags)) return -EINVAL;
 	addr = (struct sockaddr_atmsvc *) sockaddr;
 	if (addr->sas_family != AF_ATMSVC) return -EAFNOSUPPORT;
 	clear_bit(ATM_VF_BOUND,&vcc->flags);
 	    /* failing rebind will kill old binding */
 	/* @@@ check memory (de)allocation on rebind */
 	if (!test_bit(ATM_VF_HASQOS,&vcc->flags)) return -EBADFD;
 	vcc->local = *addr;
 	vcc->reply = WAITING;
 	sigd_enq(vcc,as_bind,NULL,NULL,&vcc->local);
 	add_wait_queue(&vcc->sleep,&wait);
 	while (vcc->reply == WAITING && sigd) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule();
 	}
 	remove_wait_queue(&vcc->sleep,&wait);
 	clear_bit(ATM_VF_REGIS,&vcc->flags); /* doesn't count */
 	if (!sigd) return -EUNATCH;
         if (!vcc->reply) set_bit(ATM_VF_BOUND,&vcc->flags);
 	return vcc->reply;
 }


 static int svc_connect(struct socket *sock,struct sockaddr *sockaddr,
     int sockaddr_len,int flags)
 {
 	DECLARE_WAITQUEUE(wait,current);
 	struct sockaddr_atmsvc *addr;
 	struct atm_vcc *vcc = ATM_SD(sock);
 	int error;

 	DPRINTK("svc_connect %p\n",vcc);
 	if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) return -EINVAL;
 	if (sock->state == SS_CONNECTED) return -EISCONN;
 	if (sock->state == SS_CONNECTING) {
 		if (vcc->reply == WAITING) return -EALREADY;
 		sock->state = SS_UNCONNECTED;
 		if (vcc->reply) return vcc->reply;
 	}
 	else {
 		int error;

 		if (sock->state != SS_UNCONNECTED) return -EINVAL;
 		if (test_bit(ATM_VF_SESSION,&vcc->flags)) return -EINVAL;
 		addr = (struct sockaddr_atmsvc *) sockaddr;
 		if (addr->sas_family != AF_ATMSVC) return -EAFNOSUPPORT;
 		if (!test_bit(ATM_VF_HASQOS,&vcc->flags)) return -EBADFD;
 		if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
 		    vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
 			return -EINVAL;
 		if (!vcc->qos.txtp.traffic_class &&
 		    !vcc->qos.rxtp.traffic_class) return -EINVAL;
 		vcc->remote = *addr;
 		vcc->reply = WAITING;
 		sigd_enq(vcc,as_connect,NULL,NULL,&vcc->remote);
 		if (flags & O_NONBLOCK) {
 			sock->state = SS_CONNECTING;
 			return -EINPROGRESS;
 		}
 		add_wait_queue(&vcc->sleep,&wait);
 		error = 0;
 		while (vcc->reply == WAITING && sigd) {
 			set_current_state(TASK_INTERRUPTIBLE);
 			schedule();
 			if (!signal_pending(current)) continue;
 			DPRINTK("*ABORT*\n");
 			/*
 			 * This is tricky:
 			 *   Kernel ---close--> Demon
 			 *   Kernel <--close--- Demon
 		         * or
 			 *   Kernel ---close--> Demon
 			 *   Kernel <--error--- Demon
 			 * or
 			 *   Kernel ---close--> Demon
 			 *   Kernel <--okay---- Demon
 			 *   Kernel <--close--- Demon
 			 */
 			sigd_enq(vcc,as_close,NULL,NULL,NULL);
 			while (vcc->reply == WAITING && sigd) {
 				set_current_state(TASK_UNINTERRUPTIBLE);
 				schedule();
 			}
 			if (!vcc->reply)
 				while (!test_bit(ATM_VF_RELEASED,&vcc->flags)
 				    && sigd) {
 					set_current_state(TASK_UNINTERRUPTIBLE);
 					schedule();
 				}
 			clear_bit(ATM_VF_REGIS,&vcc->flags);
 			clear_bit(ATM_VF_RELEASED,&vcc->flags);
 			clear_bit(ATM_VF_CLOSE,&vcc->flags);
 			    /* we're gone now but may connect later */
 			error = -EINTR;
 			break;
 		}
 		remove_wait_queue(&vcc->sleep,&wait);
 		if (error) return error;
 		if (!sigd) return -EUNATCH;
 		if (vcc->reply) return vcc->reply;
 	}
 /*
  * Not supported yet
  *
  * #ifndef CONFIG_SINGLE_SIGITF
  */
 	vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
 	vcc->qos.txtp.pcr = 0;
 	vcc->qos.txtp.min_pcr = 0;
 /*
  * #endif
  */
 	if (!(error = atm_connect(sock,vcc->itf,vcc->vpi,vcc->vci)))
 		sock->state = SS_CONNECTED;
 	else (void) svc_disconnect(vcc);
 	return error;
 }


 static int svc_listen(struct socket *sock,int backlog)
 {
 	DECLARE_WAITQUEUE(wait,current);
 	struct atm_vcc *vcc = ATM_SD(sock);

 	DPRINTK("svc_listen %p\n",vcc);
 	/* let server handle listen on unbound sockets */
 	if (test_bit(ATM_VF_SESSION,&vcc->flags)) return -EINVAL;
 	vcc->reply = WAITING;
 	sigd_enq(vcc,as_listen,NULL,NULL,&vcc->local);
 	add_wait_queue(&vcc->sleep,&wait);
 	while (vcc->reply == WAITING && sigd) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule();
 	}
 	remove_wait_queue(&vcc->sleep,&wait);
 	if (!sigd) return -EUNATCH;
 	set_bit(ATM_VF_LISTEN,&vcc->flags);
 	vcc->backlog_quota = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
 	return vcc->reply;
 }


 static int svc_accept(struct socket *sock,struct socket *newsock,int flags)
 {
 	struct sk_buff *skb;
 	struct atmsvc_msg *msg;
 	struct atm_vcc *old_vcc = ATM_SD(sock);
 	struct atm_vcc *new_vcc;
 	int error;

 	error = svc_create(newsock,0);
 	if (error)
 		return error;

 	new_vcc = ATM_SD(newsock);

 	DPRINTK("svc_accept %p -> %p\n",old_vcc,new_vcc);
 	while (1) {
 		DECLARE_WAITQUEUE(wait,current);

 		add_wait_queue(&old_vcc->sleep,&wait);
 		while (!(skb = skb_dequeue(&old_vcc->listenq)) && sigd) {
 			if (test_bit(ATM_VF_RELEASED,&old_vcc->flags)) break;
 			if (test_bit(ATM_VF_CLOSE,&old_vcc->flags)) {
 				error = old_vcc->reply;
 				break;
 			}
 			if (flags & O_NONBLOCK) {
 				error = -EAGAIN;
 				break;
 			}
 			set_current_state(TASK_INTERRUPTIBLE);
 			schedule();
 			if (signal_pending(current)) {
 				error = -ERESTARTSYS;
 				break;
 			}
 		}
 		remove_wait_queue(&old_vcc->sleep,&wait);
 		if (error) return error;
 		if (!skb) return -EUNATCH;
 		msg = (struct atmsvc_msg *) skb->data;
 		new_vcc->qos = msg->qos;
 		set_bit(ATM_VF_HASQOS,&new_vcc->flags);
 		new_vcc->remote = msg->svc;
 		new_vcc->local = msg->local;
 		new_vcc->sap = msg->sap;
 		error = atm_connect(newsock,msg->pvc.sap_addr.itf,
 		    msg->pvc.sap_addr.vpi,msg->pvc.sap_addr.vci);
 		dev_kfree_skb(skb);
 		old_vcc->backlog_quota++;
 		if (error) {
 			sigd_enq2(NULL,as_reject,old_vcc,NULL,NULL,
 			    &old_vcc->qos,error);
 			return error == -EAGAIN ? -EBUSY : error;
 		}
 		/* wait should be short, so we ignore the non-blocking flag */
 		new_vcc->reply = WAITING;
 		sigd_enq(new_vcc,as_accept,old_vcc,NULL,NULL);
 		add_wait_queue(&new_vcc->sleep,&wait);
 		while (new_vcc->reply == WAITING && sigd) {
 			set_current_state(TASK_UNINTERRUPTIBLE);
 			schedule();
 		}
 		remove_wait_queue(&new_vcc->sleep,&wait);
 		if (!sigd) return -EUNATCH;
 		if (!new_vcc->reply) break;
 		if (new_vcc->reply != -ERESTARTSYS) return new_vcc->reply;
 	}
 	newsock->state = SS_CONNECTED;
 	return 0;
 }


 static int svc_getname(struct socket *sock,struct sockaddr *sockaddr,
     int *sockaddr_len,int peer)
 {
 	struct sockaddr_atmsvc *addr;

 	*sockaddr_len = sizeof(struct sockaddr_atmsvc);
 	addr = (struct sockaddr_atmsvc *) sockaddr;
 	memcpy(addr,peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
 	    sizeof(struct sockaddr_atmsvc));
 	return 0;
 }


 int svc_change_qos(struct atm_vcc *vcc,struct atm_qos *qos)
 {
 	DECLARE_WAITQUEUE(wait,current);

 	vcc->reply = WAITING;
 	sigd_enq2(vcc,as_modify,NULL,NULL,&vcc->local,qos,0);
 	add_wait_queue(&vcc->sleep,&wait);
 	while (vcc->reply == WAITING && !test_bit(ATM_VF_RELEASED,&vcc->flags)
 	    && sigd) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule();
 	}
 	remove_wait_queue(&vcc->sleep,&wait);
 	if (!sigd) return -EUNATCH;
 	return vcc->reply;
 }


 static int svc_setsockopt(struct socket *sock,int level,int optname,
     char *optval,int optlen)
 {
 	struct atm_vcc *vcc;

 	if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP ||
 	    optlen != sizeof(struct atm_sap))
 		return atm_setsockopt(sock,level,optname,optval,optlen);
 	vcc = ATM_SD(sock);
 	if (copy_from_user(&vcc->sap,optval,optlen)) return -EFAULT;
 	set_bit(ATM_VF_HASSAP,&vcc->flags);
 	return 0;
 }


 static int svc_getsockopt(struct socket *sock,int level,int optname,
     char *optval,int *optlen)
 {
 	int len;

 	if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP)
 		return atm_getsockopt(sock,level,optname,optval,optlen);
 	if (get_user(len,optlen)) return -EFAULT;
 	if (len != sizeof(struct atm_sap)) return -EINVAL;
 	return copy_to_user(optval,&ATM_SD(sock)->sap,sizeof(struct atm_sap)) ?
 	    -EFAULT : 0;
 }


 static struct proto_ops SOCKOPS_WRAPPED(svc_proto_ops) = {
 	family:		PF_ATMSVC,

 	release:	svc_release,
 	bind:		svc_bind,
 	connect:	svc_connect,
 	socketpair:	sock_no_socketpair,
 	accept:		svc_accept,
 	getname:	svc_getname,
 	poll:		atm_poll,
 	ioctl:		atm_ioctl,
 	listen:		svc_listen,
 	shutdown:	svc_shutdown,
 	setsockopt:	svc_setsockopt,
 	getsockopt:	svc_getsockopt,
 	sendmsg:	atm_sendmsg,
 	recvmsg:	atm_recvmsg,
 	mmap:		sock_no_mmap,
 	sendpage:	sock_no_sendpage,
 };


 #include <linux/smp_lock.h>
 SOCKOPS_WRAP(svc_proto, PF_ATMSVC);

 static int svc_create(struct socket *sock,int protocol)
 {
 	int error;

 	sock->ops = &svc_proto_ops;
 	error = atm_create(sock,protocol,AF_ATMSVC);
 	if (error) return error;
 	ATM_SD(sock)->callback = svc_callback;
 	ATM_SD(sock)->local.sas_family = AF_ATMSVC;
 	ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
 	return 0;
 }


 static struct net_proto_family svc_family_ops = {
 	PF_ATMSVC,
 	svc_create,
 	0,			/* no authentication */
 	0,			/* no encryption */
 	0			/* no encrypt_net */
 };


 /*
  *	Initialize the ATM SVC protocol family
  */

 static int __init atmsvc_init(void)
 {
 	if (sock_register(&svc_family_ops) < 0) {
 		printk(KERN_ERR "ATMSVC: can't register");
 		return -1;
 	}
 	return 0;
 }

 module_init(atmsvc_init);
	/* net/atm/svc.c - ATM SVC sockets */

	/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */


	#include <linux/string.h>
	#include <linux/net.h> /* struct socket, struct net_proto,
	struct proto_ops */
	#include <linux/errno.h> /* error codes */
	#include <linux/kernel.h> /* printk */
	#include <linux/skbuff.h>
	#include <linux/wait.h>
	#include <linux/sched.h> /* jiffies and HZ */
	#include <linux/fcntl.h> /* O_NONBLOCK */
	#include <linux/init.h>
	#include <linux/atm.h> /* ATM stuff */
	#include <linux/atmsap.h>
	#include <linux/atmsvc.h>
	#include <linux/atmdev.h>
	#include <linux/bitops.h>
	#include <net/sock.h> /* for sock_no_* */
	#include <asm/uaccess.h>

	#include "resources.h"
	#include "common.h" /* common for PVCs and SVCs */
	#include "signaling.h"
	#include "addr.h"


	#if 0
	#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
	#else
	#define DPRINTK(format,args...)
	#endif


	static int svc_create(struct socket *sock,int protocol);


	/*
	* Note: since all this is still nicely synchronized with the signaling demon,
	* there's no need to protect sleep loops with clis. If signaling is
	* moved into the kernel, that would change.
	*/


	void svc_callback(struct atm_vcc *vcc)
	{
	wake_up(&vcc->sleep);
	}




	static int svc_shutdown(struct socket *sock,int how)
	{
	return 0;
	}


	static void svc_disconnect(struct atm_vcc *vcc)
	{
	DECLARE_WAITQUEUE(wait,current);
	struct sk_buff *skb;

	DPRINTK("svc_disconnect %p\n",vcc);
	if (test_bit(ATM_VF_REGIS,&vcc->flags)) {
	sigd_enq(vcc,as_close,NULL,NULL,NULL);
	add_wait_queue(&vcc->sleep,&wait);
	while (!test_bit(ATM_VF_RELEASED,&vcc->flags) && sigd) {
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule();
	}
	remove_wait_queue(&vcc->sleep,&wait);
	}
	/* beware - socket is still in use by atmsigd until the last
	as_indicate has been answered */
	while ((skb = skb_dequeue(&vcc->listenq))) {
	DPRINTK("LISTEN REL\n");
	sigd_enq2(NULL,as_reject,vcc,NULL,NULL,&vcc->qos,0);
	dev_kfree_skb(skb);
	}
	clear_bit(ATM_VF_REGIS,&vcc->flags);
	clear_bit(ATM_VF_RELEASED,&vcc->flags);
	clear_bit(ATM_VF_CLOSE,&vcc->flags);
	/* ... may retry later */
	}


	static int svc_release(struct socket *sock)
	{
	struct atm_vcc *vcc;

	if (!sock->sk) return 0;
	vcc = ATM_SD(sock);
	DPRINTK("svc_release %p\n",vcc);
	clear_bit(ATM_VF_READY,&vcc->flags);
	atm_release_vcc_sk(sock->sk,0);
	svc_disconnect(vcc);
	/* VCC pointer is used as a reference, so we must not free it
	(thereby subjecting it to re-use) before all pending connections
	are closed */
	free_atm_vcc_sk(sock->sk);
	return 0;
	}


	static int svc_bind(struct socket sock,struct sockaddr sockaddr,
	int sockaddr_len)
	{
	DECLARE_WAITQUEUE(wait,current);
	struct sockaddr_atmsvc *addr;
	struct atm_vcc *vcc;

	if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) return -EINVAL;
	if (sock->state == SS_CONNECTED) return -EISCONN;
	if (sock->state != SS_UNCONNECTED) return -EINVAL;
	vcc = ATM_SD(sock);
	if (test_bit(ATM_VF_SESSION,&vcc->flags)) return -EINVAL;
	addr = (struct sockaddr_atmsvc *) sockaddr;
	if (addr->sas_family != AF_ATMSVC) return -EAFNOSUPPORT;
	clear_bit(ATM_VF_BOUND,&vcc->flags);
	/* failing rebind will kill old binding */
	/* @@@ check memory (de)allocation on rebind */
	if (!test_bit(ATM_VF_HASQOS,&vcc->flags)) return -EBADFD;
	vcc->local = *addr;
	vcc->reply = WAITING;
	sigd_enq(vcc,as_bind,NULL,NULL,&vcc->local);
	add_wait_queue(&vcc->sleep,&wait);
	while (vcc->reply == WAITING && sigd) {
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule();
	}
	remove_wait_queue(&vcc->sleep,&wait);
	clear_bit(ATM_VF_REGIS,&vcc->flags); /* doesn't count */
	if (!sigd) return -EUNATCH;
	if (!vcc->reply) set_bit(ATM_VF_BOUND,&vcc->flags);
	return vcc->reply;
	}


	static int svc_connect(struct socket sock,struct sockaddr sockaddr,
	int sockaddr_len,int flags)
	{
	DECLARE_WAITQUEUE(wait,current);
	struct sockaddr_atmsvc *addr;
	struct atm_vcc *vcc = ATM_SD(sock);
	int error;

	DPRINTK("svc_connect %p\n",vcc);
	if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) return -EINVAL;
	if (sock->state == SS_CONNECTED) return -EISCONN;
	if (sock->state == SS_CONNECTING) {
	if (vcc->reply == WAITING) return -EALREADY;
	sock->state = SS_UNCONNECTED;
	if (vcc->reply) return vcc->reply;
	}
	else {
	int error;

	if (sock->state != SS_UNCONNECTED) return -EINVAL;
	if (test_bit(ATM_VF_SESSION,&vcc->flags)) return -EINVAL;
	addr = (struct sockaddr_atmsvc *) sockaddr;
	if (addr->sas_family != AF_ATMSVC) return -EAFNOSUPPORT;
	if (!test_bit(ATM_VF_HASQOS,&vcc->flags)) return -EBADFD;
	if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS \|\|
	vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
	return -EINVAL;
	if (!vcc->qos.txtp.traffic_class &&
	!vcc->qos.rxtp.traffic_class) return -EINVAL;
	vcc->remote = *addr;
	vcc->reply = WAITING;
	sigd_enq(vcc,as_connect,NULL,NULL,&vcc->remote);
	if (flags & O_NONBLOCK) {
	sock->state = SS_CONNECTING;
	return -EINPROGRESS;
	}
	add_wait_queue(&vcc->sleep,&wait);
	error = 0;
	while (vcc->reply == WAITING && sigd) {
	set_current_state(TASK_INTERRUPTIBLE);
	schedule();
	if (!signal_pending(current)) continue;
	DPRINTK("ABORT\n");
	/*
	* This is tricky:
	* Kernel ---close--> Demon
	* Kernel <--close--- Demon
	* or
	* Kernel ---close--> Demon
	* Kernel <--error--- Demon
	* or
	* Kernel ---close--> Demon
	* Kernel <--okay---- Demon
	* Kernel <--close--- Demon
	*/
	sigd_enq(vcc,as_close,NULL,NULL,NULL);
	while (vcc->reply == WAITING && sigd) {
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule();
	}
	if (!vcc->reply)
	while (!test_bit(ATM_VF_RELEASED,&vcc->flags)
	&& sigd) {
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule();
	}
	clear_bit(ATM_VF_REGIS,&vcc->flags);
	clear_bit(ATM_VF_RELEASED,&vcc->flags);
	clear_bit(ATM_VF_CLOSE,&vcc->flags);
	/* we're gone now but may connect later */
	error = -EINTR;
	break;
	}
	remove_wait_queue(&vcc->sleep,&wait);
	if (error) return error;
	if (!sigd) return -EUNATCH;
	if (vcc->reply) return vcc->reply;
	}
	/*
	* Not supported yet
	*
	* #ifndef CONFIG_SINGLE_SIGITF
	*/
	vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
	vcc->qos.txtp.pcr = 0;
	vcc->qos.txtp.min_pcr = 0;
	/*
	* #endif
	*/
	if (!(error = atm_connect(sock,vcc->itf,vcc->vpi,vcc->vci)))
	sock->state = SS_CONNECTED;
	else (void) svc_disconnect(vcc);
	return error;
	}


	static int svc_listen(struct socket *sock,int backlog)
	{
	DECLARE_WAITQUEUE(wait,current);
	struct atm_vcc *vcc = ATM_SD(sock);

	DPRINTK("svc_listen %p\n",vcc);
	/* let server handle listen on unbound sockets */
	if (test_bit(ATM_VF_SESSION,&vcc->flags)) return -EINVAL;
	vcc->reply = WAITING;
	sigd_enq(vcc,as_listen,NULL,NULL,&vcc->local);
	add_wait_queue(&vcc->sleep,&wait);
	while (vcc->reply == WAITING && sigd) {
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule();
	}
	remove_wait_queue(&vcc->sleep,&wait);
	if (!sigd) return -EUNATCH;
	set_bit(ATM_VF_LISTEN,&vcc->flags);
	vcc->backlog_quota = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
	return vcc->reply;
	}


	static int svc_accept(struct socket sock,struct socket newsock,int flags)
	{
	struct sk_buff *skb;
	struct atmsvc_msg *msg;
	struct atm_vcc *old_vcc = ATM_SD(sock);
	struct atm_vcc *new_vcc;
	int error;

	error = svc_create(newsock,0);
	if (error)
	return error;

	new_vcc = ATM_SD(newsock);

	DPRINTK("svc_accept %p -> %p\n",old_vcc,new_vcc);
	while (1) {
	DECLARE_WAITQUEUE(wait,current);

	add_wait_queue(&old_vcc->sleep,&wait);
	while (!(skb = skb_dequeue(&old_vcc->listenq)) && sigd) {
	if (test_bit(ATM_VF_RELEASED,&old_vcc->flags)) break;
	if (test_bit(ATM_VF_CLOSE,&old_vcc->flags)) {
	error = old_vcc->reply;
	break;
	}
	if (flags & O_NONBLOCK) {
	error = -EAGAIN;
	break;
	}
	set_current_state(TASK_INTERRUPTIBLE);
	schedule();
	if (signal_pending(current)) {
	error = -ERESTARTSYS;
	break;
	}
	}
	remove_wait_queue(&old_vcc->sleep,&wait);
	if (error) return error;
	if (!skb) return -EUNATCH;
	msg = (struct atmsvc_msg *) skb->data;
	new_vcc->qos = msg->qos;
	set_bit(ATM_VF_HASQOS,&new_vcc->flags);
	new_vcc->remote = msg->svc;
	new_vcc->local = msg->local;
	new_vcc->sap = msg->sap;
	error = atm_connect(newsock,msg->pvc.sap_addr.itf,
	msg->pvc.sap_addr.vpi,msg->pvc.sap_addr.vci);
	dev_kfree_skb(skb);
	old_vcc->backlog_quota++;
	if (error) {
	sigd_enq2(NULL,as_reject,old_vcc,NULL,NULL,
	&old_vcc->qos,error);
	return error == -EAGAIN ? -EBUSY : error;
	}
	/* wait should be short, so we ignore the non-blocking flag */
	new_vcc->reply = WAITING;
	sigd_enq(new_vcc,as_accept,old_vcc,NULL,NULL);
	add_wait_queue(&new_vcc->sleep,&wait);
	while (new_vcc->reply == WAITING && sigd) {
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule();
	}
	remove_wait_queue(&new_vcc->sleep,&wait);
	if (!sigd) return -EUNATCH;
	if (!new_vcc->reply) break;
	if (new_vcc->reply != -ERESTARTSYS) return new_vcc->reply;
	}
	newsock->state = SS_CONNECTED;
	return 0;
	}


	static int svc_getname(struct socket sock,struct sockaddr sockaddr,
	int *sockaddr_len,int peer)
	{
	struct sockaddr_atmsvc *addr;

	*sockaddr_len = sizeof(struct sockaddr_atmsvc);
	addr = (struct sockaddr_atmsvc *) sockaddr;
	memcpy(addr,peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
	sizeof(struct sockaddr_atmsvc));
	return 0;
	}


	int svc_change_qos(struct atm_vcc vcc,struct atm_qos qos)
	{
	DECLARE_WAITQUEUE(wait,current);

	vcc->reply = WAITING;
	sigd_enq2(vcc,as_modify,NULL,NULL,&vcc->local,qos,0);
	add_wait_queue(&vcc->sleep,&wait);
	while (vcc->reply == WAITING && !test_bit(ATM_VF_RELEASED,&vcc->flags)
	&& sigd) {
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule();
	}
	remove_wait_queue(&vcc->sleep,&wait);
	if (!sigd) return -EUNATCH;
	return vcc->reply;
	}


	static int svc_setsockopt(struct socket *sock,int level,int optname,
	char *optval,int optlen)
	{
	struct atm_vcc *vcc;

	if (!__SO_LEVEL_MATCH(optname, level) \|\| optname != SO_ATMSAP \|\|
	optlen != sizeof(struct atm_sap))
	return atm_setsockopt(sock,level,optname,optval,optlen);
	vcc = ATM_SD(sock);
	if (copy_from_user(&vcc->sap,optval,optlen)) return -EFAULT;
	set_bit(ATM_VF_HASSAP,&vcc->flags);
	return 0;
	}


	static int svc_getsockopt(struct socket *sock,int level,int optname,
	char optval,int optlen)
	{
	int len;

	if (!__SO_LEVEL_MATCH(optname, level) \|\| optname != SO_ATMSAP)
	return atm_getsockopt(sock,level,optname,optval,optlen);
	if (get_user(len,optlen)) return -EFAULT;
	if (len != sizeof(struct atm_sap)) return -EINVAL;
	return copy_to_user(optval,&ATM_SD(sock)->sap,sizeof(struct atm_sap)) ?
	-EFAULT : 0;
	}


	static struct proto_ops SOCKOPS_WRAPPED(svc_proto_ops) = {
	family: PF_ATMSVC,

	release: svc_release,
	bind: svc_bind,
	connect: svc_connect,
	socketpair: sock_no_socketpair,
	accept: svc_accept,
	getname: svc_getname,
	poll: atm_poll,
	ioctl: atm_ioctl,
	listen: svc_listen,
	shutdown: svc_shutdown,
	setsockopt: svc_setsockopt,
	getsockopt: svc_getsockopt,
	sendmsg: atm_sendmsg,
	recvmsg: atm_recvmsg,
	mmap: sock_no_mmap,
	sendpage: sock_no_sendpage,
	};


	#include <linux/smp_lock.h>
	SOCKOPS_WRAP(svc_proto, PF_ATMSVC);

	static int svc_create(struct socket *sock,int protocol)
	{
	int error;

	sock->ops = &svc_proto_ops;
	error = atm_create(sock,protocol,AF_ATMSVC);
	if (error) return error;
	ATM_SD(sock)->callback = svc_callback;
	ATM_SD(sock)->local.sas_family = AF_ATMSVC;
	ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
	return 0;
	}


	static struct net_proto_family svc_family_ops = {
	PF_ATMSVC,
	svc_create,
	0, /* no authentication */
	0, /* no encryption */
	0 /* no encrypt_net */
	};


	/*
	* Initialize the ATM SVC protocol family
	*/

	static int __init atmsvc_init(void)
	{
	if (sock_register(&svc_family_ops) < 0) {
	printk(KERN_ERR "ATMSVC: can't register");
	return -1;
	}
	return 0;
	}

	module_init(atmsvc_init);