patch-2.1.16 linux/net/x25/af_x25.c

• Lines: 1382
• Date: Wed Dec 18 12:07:56 1996
• Orig file: v2.1.15/linux/net/x25/af_x25.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.15/linux/net/x25/af_x25.c linux/net/x25/af_x25.c
@@ -0,0 +1,1381 @@
+/*
+ *	X.25 Packet Layer release 001
+ *
+ *	This is ALPHA test software. This code may break your machine, randomly fail to work with new 
+ *	releases, misbehave and/or generally screw up. It might even work. 
+ *
+ *	This code REQUIRES 2.1.15 or higher
+ *
+ *	This module:
+ *		This module is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ *	History
+ *	X.25 001	Jonathan Naylor	Started coding.
+ */
+  
+#include <linux/config.h>
+#if defined(CONFIG_X25) || defined(CONFIG_X25_MODULE)
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/stat.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/segment.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/termios.h>	/* For TIOCINQ/OUTQ */
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/proc_fs.h>
+#include <linux/if_arp.h>
+#include <net/x25.h>
+
+int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
+int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
+int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
+int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
+int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
+
+static unsigned int lci = 1;
+
+struct proto_ops x25_proto_ops;
+
+static struct sock *volatile x25_list = NULL;
+
+int x25_addr_ntoa(unsigned char *p, x25_address *called_addr, x25_address *calling_addr)
+{
+	int called_len, calling_len;
+	char *called, *calling;
+	int i;
+
+	called_len  = (*p >> 0) & 0x0F;
+	calling_len = (*p >> 4) & 0x0F;
+
+	called  = called_addr->x25_addr;
+	calling = calling_addr->x25_addr;
+	p++;
+
+	for (i = 0; i < (called_len + calling_len); i++) {
+		if (i < called_len) {
+			if (i % 2 != 0) {
+				*called++ = ((*p >> 0) & 0x0F) + '0';
+				p++;
+			} else {
+				*called++ = ((*p >> 4) & 0x0F) + '0';
+			}
+		} else {
+			if (i % 2 != 0) {
+				*calling++ = ((*p >> 0) & 0x0F) + '0';
+				p++;
+			} else {
+				*calling++ = ((*p >> 4) & 0x0F) + '0';
+			}
+		}
+	}
+
+	*called  = '\0';
+	*calling = '\0';
+
+	return 1 + (called_len + calling_len + 1) / 2;
+}
+
+int x25_addr_aton(unsigned char *p, x25_address *called_addr, x25_address *calling_addr)
+{
+	unsigned int called_len, calling_len;
+	char *called, *calling;
+	int i;
+
+	called  = called_addr->x25_addr;
+	calling = calling_addr->x25_addr;
+
+	called_len  = strlen(called);
+	calling_len = strlen(calling);
+	
+	*p++ = (calling_len << 4) | (called_len << 0);
+	
+	for (i = 0; i < (called_len + calling_len); i++) {
+		if (i < called_len) {
+			if (i % 2 != 0) {
+				*p |= (*called++ - '0') << 0;
+				p++;
+				*p = 0x00;
+			} else {
+				*p |= (*called++ - '0') << 4;
+			}
+		} else {
+			if (i % 2 != 0) {
+				*p |= (*calling++ - '0') << 0;
+				p++;
+				*p = 0x00;
+			} else {
+				*p |= (*calling++ - '0') << 4;
+			}
+		}
+	}
+	
+	return 1 + (called_len + calling_len + 1) / 2;
+}
+
+/*
+ *	Socket removal during an interrupt is now safe.
+ */
+static void x25_remove_socket(struct sock *sk)
+{
+	struct sock *s;
+	unsigned long flags;
+	
+	save_flags(flags);
+	cli();
+
+	if ((s = x25_list) == sk) {
+		x25_list = s->next;
+		restore_flags(flags);
+		return;
+	}
+
+	while (s != NULL && s->next != NULL) {
+		if (s->next == sk) {
+			s->next = sk->next;
+			restore_flags(flags);
+			return;
+		}
+
+		s = s->next;
+	}
+
+	restore_flags(flags);
+}
+
+/*
+ *	Kill all bound sockets on a dropped device.
+ */
+static void x25_kill_by_device(struct device *dev)
+{
+	struct sock *s;
+	
+	for (s = x25_list; s != NULL; s = s->next) {
+		if (s->protinfo.x25->neighbour->dev == dev) {
+			s->protinfo.x25->state  = X25_STATE_0;
+			s->state                = TCP_CLOSE;
+			s->err                  = ENETUNREACH;
+			s->shutdown            |= SEND_SHUTDOWN;
+			s->state_change(s);
+			s->dead                 = 1;
+		}
+	}
+}
+
+/*
+ *	Handle device status changes.
+ */
+static int x25_device_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+	struct device *dev = (struct device *)ptr;
+
+	if (dev->type == ARPHRD_X25 || dev->type == ARPHRD_ETHER) {
+		switch (event) {
+			case NETDEV_UP:
+				x25_link_device_up(dev);
+				break;
+			case NETDEV_DOWN:
+				x25_kill_by_device(dev);
+				x25_route_device_down(dev);
+				x25_link_device_down(dev);
+				break;
+		}
+	}
+
+	return NOTIFY_DONE;
+}
+
+/*
+ *	Add a socket to the bound sockets list.
+ */
+static void x25_insert_socket(struct sock *sk)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+
+	sk->next = x25_list;
+	x25_list  = sk;
+
+	restore_flags(flags);
+}
+
+/*
+ *	Find a socket that wants to accept the Call Request we just
+ *	received.
+ */
+static struct sock *x25_find_listener(x25_address *addr)
+{
+	unsigned long flags;
+	struct sock *s;
+
+	save_flags(flags);
+	cli();
+
+	for (s = x25_list; s != NULL; s = s->next) {
+		if (strcmp(s->protinfo.x25->source_addr.x25_addr, addr->x25_addr) == 0 && s->state == TCP_LISTEN) {
+			restore_flags(flags);
+			return s;
+		}
+	}
+
+	restore_flags(flags);
+	return NULL;
+}
+
+/*
+ *	Find a connected X.25 socket given my LCI.
+ */
+struct sock *x25_find_socket(unsigned int lci)
+{
+	struct sock *s;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+
+	for (s = x25_list; s != NULL; s = s->next) {
+		if (s->protinfo.x25->lci == lci) {
+			restore_flags(flags);
+			return s;
+		}
+	}
+
+	restore_flags(flags);
+	return NULL;
+}
+
+/*
+ *	Find a unique LCI for a given device.
+ */
+unsigned int x25_new_lci(void)
+{
+	lci++;
+	if (lci > 4095) lci = 1;
+
+	while (x25_find_socket(lci) != NULL) {
+		lci++;
+		if (lci > 4095) lci = 1;
+	}
+
+	return lci;
+}
+
+/*
+ *	Deferred destroy.
+ */
+void x25_destroy_socket(struct sock *);
+
+/*
+ *	Handler for deferred kills.
+ */
+static void x25_destroy_timer(unsigned long data)
+{
+	x25_destroy_socket((struct sock *)data);
+}
+
+/*
+ *	This is called from user mode and the timers. Thus it protects itself against
+ *	interrupt users but doesn't worry about being called during work.
+ *	Once it is removed from the queue no interrupt or bottom half will
+ *	touch it and we are (fairly 8-) ) safe.
+ */
+void x25_destroy_socket(struct sock *sk)	/* Not static as it's used by the timer */
+{
+	struct sk_buff *skb;
+	unsigned long flags;
+	
+	save_flags(flags);
+	cli();
+	
+	del_timer(&sk->timer);
+	
+	x25_remove_socket(sk);
+	x25_clear_queues(sk);		/* Flush the queues */
+	
+	while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
+		if (skb->sk != sk) {		/* A pending connection */
+			skb->sk->dead = 1;	/* Queue the unaccepted socket for death */
+			x25_set_timer(skb->sk);
+			skb->sk->protinfo.x25->state = X25_STATE_0;
+		}
+
+		kfree_skb(skb, FREE_READ);
+	}
+	
+	if (sk->wmem_alloc || sk->rmem_alloc) { /* Defer: outstanding buffers */
+		init_timer(&sk->timer);
+		sk->timer.expires  = jiffies + 10 * HZ;
+		sk->timer.function = x25_destroy_timer;
+		sk->timer.data     = (unsigned long)sk;
+		add_timer(&sk->timer);
+	} else {
+		kfree_s(sk->protinfo.x25, sizeof(*sk->protinfo.x25));
+		sk_free(sk);
+		MOD_DEC_USE_COUNT;
+	}
+
+	restore_flags(flags);
+}
+
+/*
+ *	Handling for system calls applied via the various interfaces to a
+ *	X.25 socket object.
+ */
+ 
+static int x25_fcntl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	return -EINVAL;
+}
+
+static int x25_setsockopt(struct socket *sock, int level, int optname,
+	char *optval, int optlen)
+{
+	struct sock *sk;
+	int err, opt;
+
+	sk = (struct sock *)sock->sk;
+	
+	if (level != SOL_X25)
+		return -EOPNOTSUPP;
+
+	if (optval == NULL)
+		return -EINVAL;
+
+	if ((err = verify_area(VERIFY_READ, optval, sizeof(int))) != 0)
+		return err;
+
+	get_user(opt, (int *)optval);
+	
+	switch (optname) {
+		case X25_QBITINCL:
+			sk->protinfo.x25->qbitincl = opt ? 1 : 0;
+			return 0;
+
+		case X25_PACKET_SIZE:
+			if (sk->state != TCP_LISTEN)
+				return -EINVAL;
+			if (opt < X25_PS16 || opt > X25_PS4096)
+				return -EINVAL;
+			sk->protinfo.x25->facilities.packet_size = opt;
+			return 0;
+
+		case X25_WINDOW_SIZE:
+			if (sk->state != TCP_LISTEN)
+				return -EINVAL;
+			if (sk->protinfo.x25->neighbour->extended) {
+				if (opt < 1 || opt > 127)
+					return -EINVAL;
+			} else {
+				if (opt < 1 || opt > 7)
+					return -EINVAL;
+			}
+			sk->protinfo.x25->facilities.window_size = opt;
+			return 0;
+
+		case X25_THROUGHPUT_SPEED:
+			if (sk->state != TCP_LISTEN)
+				return -EINVAL;
+			if (opt < 0x03 || opt > 0x2C)
+				return -EINVAL;
+			sk->protinfo.x25->facilities.throughput = opt;
+			return 0;
+
+		case X25_REVERSE_CHARGE:
+			if (sk->state != TCP_LISTEN)
+				return -EINVAL;
+			if (opt != 0 && opt != 1)
+				return -EINVAL;
+			sk->protinfo.x25->facilities.reverse = opt;
+			return 0;
+
+		default:
+			return -ENOPROTOOPT;
+	}
+}
+
+static int x25_getsockopt(struct socket *sock, int level, int optname,
+	char *optval, int *optlen)
+{
+	struct sock *sk;
+	int val = 0;
+	int err; 
+
+	sk = (struct sock *)sock->sk;
+	
+	if (level != SOL_X25)
+		return -EOPNOTSUPP;
+	
+	switch (optname) {
+		case X25_QBITINCL:
+			val = sk->protinfo.x25->qbitincl;
+			break;
+
+		case X25_PACKET_SIZE:
+			val = sk->protinfo.x25->facilities.packet_size;
+			break;
+			
+		case X25_WINDOW_SIZE:
+			val = sk->protinfo.x25->facilities.window_size;
+			break;
+
+		case X25_THROUGHPUT_SPEED:
+			val = sk->protinfo.x25->facilities.throughput;
+			break;
+
+		case X25_REVERSE_CHARGE:
+			val = sk->protinfo.x25->facilities.reverse;
+			break;
+
+		default:
+			return -ENOPROTOOPT;
+	}
+
+	if ((err = verify_area(VERIFY_WRITE, optlen, sizeof(int))) != 0)
+		return err;
+
+	put_user(sizeof(int), (unsigned long *)optlen);
+
+	if ((err = verify_area(VERIFY_WRITE, optval, sizeof(int))) != 0)
+		return err;
+
+	put_user(val, (unsigned long *)optval);
+
+	return 0;
+}
+
+static int x25_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = (struct sock *)sock->sk;
+
+	if (sk->state != TCP_LISTEN) {
+		memset(&sk->protinfo.x25->dest_addr, '\0', X25_ADDR_LEN);
+		sk->max_ack_backlog = backlog;
+		sk->state           = TCP_LISTEN;
+		return 0;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static void def_callback1(struct sock *sk)
+{
+	if (!sk->dead)
+		wake_up_interruptible(sk->sleep);
+}
+
+static void def_callback2(struct sock *sk, int len)
+{
+	if (!sk->dead)
+		wake_up_interruptible(sk->sleep);
+}
+
+static struct sock *x25_alloc_socket(void)
+{
+	struct sock *sk;
+	x25_cb *x25;
+
+	if ((sk = sk_alloc(GFP_ATOMIC)) == NULL)
+		return NULL;
+
+	if ((x25 = (x25_cb *)kmalloc(sizeof(*x25), GFP_ATOMIC)) == NULL) {
+		sk_free(sk);
+		return NULL;
+	}
+
+	x25->sk          = sk;
+	sk->protinfo.x25 = x25;
+
+	MOD_INC_USE_COUNT;
+
+	skb_queue_head_init(&sk->receive_queue);
+	skb_queue_head_init(&sk->write_queue);
+	skb_queue_head_init(&sk->back_log);
+
+	init_timer(&sk->timer);
+
+	sk->state_change = def_callback1;
+	sk->data_ready   = def_callback2;
+	sk->write_space  = def_callback1;
+	sk->error_report = def_callback1;
+
+	skb_queue_head_init(&x25->ack_queue);
+	skb_queue_head_init(&x25->fragment_queue);
+	skb_queue_head_init(&x25->interrupt_queue);
+
+	x25->condition = 0x00;
+	x25->timer     = 0;
+
+	x25->va    = 0;
+	x25->vr    = 0;
+	x25->vs    = 0;
+	x25->vl    = 0;
+
+	return sk;
+}
+
+static int x25_create(struct socket *sock, int protocol)
+{
+	struct sock *sk;
+	x25_cb *x25;
+
+	if (sock->type != SOCK_SEQPACKET || protocol != 0)
+		return -ESOCKTNOSUPPORT;
+
+	if ((sk = x25_alloc_socket()) == NULL)
+		return -ENOMEM;
+
+	x25 = sk->protinfo.x25;
+
+	sock->ops         = &x25_proto_ops;
+
+	sk->socket        = sock;
+	sk->type          = sock->type;
+	sk->protocol      = protocol;
+	sk->allocation	  = GFP_KERNEL;
+	sk->rcvbuf        = SK_RMEM_MAX;
+	sk->sndbuf        = SK_WMEM_MAX;
+	sk->state         = TCP_CLOSE;
+	sk->priority      = SOPRI_NORMAL;
+	sk->mtu           = X25_DEFAULT_PACKET_SIZE;	/* X25_PS128 */
+	sk->zapped        = 1;
+
+	if (sock != NULL) {
+		sock->sk  = sk;
+		sk->sleep = &sock->wait;
+	}
+
+	x25->lci      = 0;
+
+	x25->t21      = sysctl_x25_call_request_timeout;
+	x25->t22      = sysctl_x25_reset_request_timeout;
+	x25->t23      = sysctl_x25_clear_request_timeout;
+	x25->t2       = sysctl_x25_ack_holdback_timeout;
+
+	x25->fraglen     = 0;
+	x25->qbitincl    = 0;
+	x25->intflg      = 0;
+	x25->state       = X25_STATE_0;
+
+	x25->facilities.window_size = X25_DEFAULT_WINDOW_SIZE;
+	x25->facilities.packet_size = X25_DEFAULT_PACKET_SIZE;
+	x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
+	x25->facilities.reverse     = X25_DEFAULT_REVERSE;
+
+	x25->neighbour   = NULL;
+
+	memset(&x25->source_addr, '\0', X25_ADDR_LEN);
+	memset(&x25->dest_addr,   '\0', X25_ADDR_LEN);
+
+	return 0;
+}
+
+static struct sock *x25_make_new(struct sock *osk)
+{
+	struct sock *sk;
+	x25_cb *x25;
+
+	if (osk->type != SOCK_SEQPACKET)
+		return NULL;
+
+	if ((sk = x25_alloc_socket()) == NULL)
+		return NULL;
+
+	x25 = sk->protinfo.x25;
+
+	sk->type        = osk->type;
+	sk->socket      = osk->socket;
+	sk->priority    = osk->priority;
+	sk->protocol    = osk->protocol;
+	sk->rcvbuf      = osk->rcvbuf;
+	sk->sndbuf      = osk->sndbuf;
+	sk->debug       = osk->debug;
+	sk->state       = TCP_ESTABLISHED;
+	sk->mtu         = osk->mtu;
+	sk->sleep       = osk->sleep;
+	sk->zapped      = osk->zapped;
+
+	x25->t21        = osk->protinfo.x25->t21;
+	x25->t22        = osk->protinfo.x25->t22;
+	x25->t23        = osk->protinfo.x25->t23;
+	x25->t2         = osk->protinfo.x25->t2;
+
+	x25->facilities = osk->protinfo.x25->facilities;
+
+	x25->qbitincl    = osk->protinfo.x25->qbitincl;
+	x25->intflg      = 0;
+	x25->fraglen     = 0;
+
+	return sk;
+}
+
+static int x25_dup(struct socket *newsock, struct socket *oldsock)
+{
+	struct sock *sk = (struct sock *)oldsock->sk;
+
+	return x25_create(newsock, sk->protocol);
+}
+
+static int x25_release(struct socket *sock, struct socket *peer)
+{
+	struct sock *sk = (struct sock *)sock->sk;
+
+	if (sk == NULL) return 0;
+
+	switch (sk->protinfo.x25->state) {
+
+		case X25_STATE_0:
+			sk->state     = TCP_CLOSE;
+			sk->shutdown |= SEND_SHUTDOWN;
+			sk->state_change(sk);
+			sk->dead      = 1;
+			x25_destroy_socket(sk);
+			break;
+
+		case X25_STATE_1:
+			sk->protinfo.x25->state = X25_STATE_0;
+			sk->state               = TCP_CLOSE;
+			sk->shutdown           |= SEND_SHUTDOWN;
+			sk->state_change(sk);
+			sk->dead                = 1;
+			x25_destroy_socket(sk);
+			break;
+
+		case X25_STATE_2:
+			sk->protinfo.x25->state = X25_STATE_0;
+			sk->state               = TCP_CLOSE;
+			sk->shutdown           |= SEND_SHUTDOWN;
+			sk->state_change(sk);
+			sk->dead                = 1;
+			x25_destroy_socket(sk);
+			break;			
+
+		case X25_STATE_3:
+		case X25_STATE_4:
+			x25_clear_queues(sk);
+			x25_write_internal(sk, X25_CLEAR_REQUEST);
+			sk->protinfo.x25->timer = sk->protinfo.x25->t23;
+			sk->protinfo.x25->state = X25_STATE_2;
+			sk->state               = TCP_CLOSE;
+			sk->shutdown           |= SEND_SHUTDOWN;
+			sk->state_change(sk);
+			sk->dead                = 1;
+			sk->destroy             = 1;
+			break;
+
+		default:
+			break;
+	}
+
+	sock->sk   = NULL;	
+	sk->socket = NULL;	/* Not used, but we should do this */
+
+	return 0;
+}
+
+static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+	struct sock *sk;
+	struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
+	
+	sk = (struct sock *)sock->sk;
+
+	if (sk->zapped == 0)
+		return -EINVAL;
+		
+	if (addr_len != sizeof(struct sockaddr_x25))
+		return -EINVAL;
+
+	if (addr->sx25_family != AF_X25)
+		return -EINVAL;
+
+	sk->protinfo.x25->source_addr = addr->sx25_addr;
+
+	x25_insert_socket(sk);
+
+	sk->zapped = 0;
+
+	if (sk->debug)
+		printk(KERN_DEBUG "x25_bind: socket is bound\n");
+
+	return 0;
+}
+
+static int x25_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
+{
+	struct sock *sk = (struct sock *)sock->sk;
+	struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
+	struct device *dev;
+	
+	if (sk->state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
+		sock->state = SS_CONNECTED;
+		return 0;	/* Connect completed during a ERESTARTSYS event */
+	}
+	
+	if (sk->state == TCP_CLOSE && sock->state == SS_CONNECTING) {
+		sock->state = SS_UNCONNECTED;
+		return -ECONNREFUSED;
+	}
+	
+	if (sk->state == TCP_ESTABLISHED)
+		return -EISCONN;	/* No reconnect on a seqpacket socket */
+		
+	sk->state   = TCP_CLOSE;	
+	sock->state = SS_UNCONNECTED;
+
+	if (addr_len != sizeof(struct sockaddr_x25))
+		return -EINVAL;
+
+	if ((dev = x25_get_route(&addr->sx25_addr)) == NULL)
+		return -ENETUNREACH;
+
+	if ((sk->protinfo.x25->neighbour = x25_get_neigh(dev)) == NULL)
+		return -ENETUNREACH;
+
+	if (sk->zapped)		/* Must bind first - autobinding does not work */
+		return -EINVAL;
+
+	sk->protinfo.x25->dest_addr = addr->sx25_addr;
+	sk->protinfo.x25->lci       = x25_new_lci();
+
+	/* Move to connecting socket, start sending Connect Requests */
+	sock->state   = SS_CONNECTING;
+	sk->state     = TCP_SYN_SENT;
+
+	sk->protinfo.x25->state = X25_STATE_1;
+	sk->protinfo.x25->timer = sk->protinfo.x25->t21;
+	x25_write_internal(sk, X25_CALL_REQUEST);
+
+	x25_set_timer(sk);
+	
+	/* Now the loop */
+	if (sk->state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
+		return -EINPROGRESS;
+		
+	cli();	/* To avoid races on the sleep */
+
+	/*
+	 * A Connect Ack with Choke or timeout or failed routing will go to closed.
+	 */
+	while (sk->state == TCP_SYN_SENT) {
+		interruptible_sleep_on(sk->sleep);
+		if (current->signal & ~current->blocked) {
+			sti();
+			return -ERESTARTSYS;
+		}
+	}
+
+	if (sk->state != TCP_ESTABLISHED) {
+		sti();
+		sock->state = SS_UNCONNECTED;
+		return sock_error(sk);	/* Always set at this point */
+	}
+	
+	sock->state = SS_CONNECTED;
+
+	sti();
+	
+	return 0;
+}
+	
+static int x25_socketpair(struct socket *sock1, struct socket *sock2)
+{
+	return -EOPNOTSUPP;
+}
+
+static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+	struct sock *sk;
+	struct sock *newsk;
+	struct sk_buff *skb;
+
+	if (newsock->sk)
+		sk_free(newsock->sk);
+
+	newsock->sk = NULL;
+	
+	sk = (struct sock *)sock->sk;
+
+	if (sk->type != SOCK_SEQPACKET)
+		return -EOPNOTSUPP;
+	
+	if (sk->state != TCP_LISTEN)
+		return -EINVAL;
+		
+	/*
+	 *	The write queue this time is holding sockets ready to use
+	 *	hooked into the CALL INDICATION we saved
+	 */
+	do {
+		cli();
+		if ((skb = skb_dequeue(&sk->receive_queue)) == NULL) {
+			if (flags & O_NONBLOCK) {
+				sti();
+				return 0;
+			}
+			interruptible_sleep_on(sk->sleep);
+			if (current->signal & ~current->blocked) {
+				sti();
+				return -ERESTARTSYS;
+			}
+		}
+	} while (skb == NULL);
+
+	newsk = skb->sk;
+	newsk->pair = NULL;
+	sti();
+
+	/* Now attach up the new socket */
+	skb->sk = NULL;
+	kfree_skb(skb, FREE_READ);
+	sk->ack_backlog--;
+	newsock->sk = newsk;
+
+	return 0;
+}
+
+static int x25_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer)
+{
+	struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
+	struct sock *sk;
+	
+	sk = (struct sock *)sock->sk;
+	
+	if (peer != 0) {
+		if (sk->state != TCP_ESTABLISHED)
+			return -ENOTCONN;
+		sx25->sx25_addr   = sk->protinfo.x25->dest_addr;
+	} else {
+		sx25->sx25_addr   = sk->protinfo.x25->source_addr;
+	}
+
+	sx25->sx25_family = AF_X25;
+	*uaddr_len = sizeof(struct sockaddr_x25);
+
+	return 0;
+}
+ 
+int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *neigh, unsigned int lci)
+{
+	struct sock *sk;
+	struct sock *make;
+	x25_address source_addr, dest_addr;
+	struct x25_facilities facilities;
+	int len;
+
+	/*
+	 *	skb->data points to the x25 frame start
+	 */
+
+	/*
+	 *	Remove the LCI and frame type.
+	 */
+	skb_pull(skb, X25_STD_MIN_LEN);
+
+	/*
+	 *	Extract the X.25 addresses and convert them to ASCII strings.
+	 */
+	len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
+
+	/*
+	 *	Remove address lengths and addresses.
+	 */
+	skb_pull(skb, len);
+
+	/*
+	 *	Find a listener for the particular address.
+	 */
+	sk = x25_find_listener(&source_addr);
+
+	/*
+	 *	We can't accept the Call Request.
+	 */
+	if (sk == NULL || sk->ack_backlog == sk->max_ack_backlog || (make = x25_make_new(sk)) == NULL) {
+		x25_transmit_clear_request(neigh, lci, 0x01);
+		return 0;
+	}
+
+	/*
+	 *	Parse the facilities.
+	 */
+	len = x25_parse_facilities(skb, &facilities);
+
+	/*
+	 *	Then remove them, leaving any Call User Data.
+	 */
+	skb_pull(skb, len);
+
+	skb->sk     = make;
+	make->state = TCP_ESTABLISHED;
+
+	make->protinfo.x25->lci           = lci;
+	make->protinfo.x25->dest_addr     = dest_addr;
+	make->protinfo.x25->source_addr   = source_addr;
+	make->protinfo.x25->neighbour     = neigh;
+
+	/*
+	 *	This implies that we accept all the incoming facilities
+	 *	values (if any). This needs fixing. XXX
+	 */
+	make->protinfo.x25->facilities    = facilities;
+
+	/*
+	 *	Incoming Call User Data. XXX
+	 */
+	
+	x25_write_internal(make, X25_CALL_ACCEPTED);
+
+	make->protinfo.x25->state = X25_STATE_3;
+
+	sk->ack_backlog++;
+	make->pair = sk;
+
+	x25_insert_socket(make);
+
+	skb_queue_head(&sk->receive_queue, skb);
+
+	x25_set_timer(make);
+
+	if (!sk->dead)
+		sk->data_ready(sk, skb->len);
+
+	return 1;
+}
+
+static int x25_sendmsg(struct socket *sock, struct msghdr *msg, int len, struct scm_cookie *scm)
+{
+	struct sock *sk = (struct sock *)sock->sk;
+	struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
+	int err;
+	struct sockaddr_x25 sx25;
+	struct sk_buff *skb;
+	unsigned char *asmptr;
+	int size, qbit = 0;
+
+	if (msg->msg_flags & ~MSG_DONTWAIT)
+		return -EINVAL;
+
+	if (sk->zapped)
+		return -EADDRNOTAVAIL;
+
+	if (sk->shutdown & SEND_SHUTDOWN) {
+		send_sig(SIGPIPE, current, 0);
+		return -EPIPE;
+	}
+
+	if (sk->protinfo.x25->neighbour == NULL)
+		return -ENETUNREACH;
+		
+	if (usx25 != NULL) {
+		if (msg->msg_namelen < sizeof(sx25))
+			return -EINVAL;
+		sx25 = *usx25;
+		if (strcmp(sk->protinfo.x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr) != 0)
+			return -EISCONN;
+		if (sx25.sx25_family != AF_X25)
+			return -EINVAL;
+	} else {
+		/*
+		 *	FIXME 1003.1g - if the socket is like this because
+		 *	it has become closed (not started closed) we ought
+		 *	to SIGPIPE, EPIPE;
+		 */
+		if (sk->state != TCP_ESTABLISHED)
+			return -ENOTCONN;
+
+		sx25.sx25_family = AF_X25;
+		sx25.sx25_addr   = sk->protinfo.x25->dest_addr;
+	}
+	
+	if (sk->debug)
+		printk(KERN_DEBUG "x25_sendmsg: sendto: Addresses built.\n");
+
+	/* Build a packet */
+	if (sk->debug)
+		printk(KERN_DEBUG "x25_sendmsg: sendto: building packet.\n");
+
+	size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
+
+	if ((skb = sock_alloc_send_skb(sk, size, 0, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
+		return err;
+
+	skb->sk   = sk;
+	skb->arp  = 1;
+
+	skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
+	
+	/*
+	 *	Put the data on the end
+	 */
+	if (sk->debug)
+		printk(KERN_DEBUG "x25_sendmsg: Copying user data\n");
+
+	skb->h.raw = skb_put(skb, len);
+	asmptr = skb->h.raw;
+
+	memcpy_fromiovec(asmptr, msg->msg_iov, len);
+
+	/*
+	 *	If the Q BIT Include socket option is in force, the first
+	 *	byte of the user data is the logical value of the Q Bit.
+	 */
+	if (sk->protinfo.x25->qbitincl) {
+		qbit = skb->data[0];
+		skb_pull(skb, 1);
+	}
+
+	/*
+	 *	Push down the X.25 header
+	 */
+	if (sk->debug)
+		printk(KERN_DEBUG "x25_sendmsg: Building X.25 Header.\n");
+
+	if (sk->protinfo.x25->neighbour->extended) {
+		/* Build an Extended X.25 header */
+		asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
+		*asmptr++ = ((sk->protinfo.x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
+		*asmptr++ = (sk->protinfo.x25->lci >> 0) & 0xFF;
+		*asmptr++ = X25_DATA;
+		*asmptr++ = X25_DATA;
+	} else {
+		/* Build an Standard X.25 header */
+		asmptr    = skb_push(skb, X25_STD_MIN_LEN);
+		*asmptr++ = ((sk->protinfo.x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
+		*asmptr++ = (sk->protinfo.x25->lci >> 0) & 0xFF;
+		*asmptr++ = X25_DATA;
+	}
+
+	if (qbit)
+		skb->data[0] |= X25_Q_BIT;
+
+	if (sk->debug)
+		printk(KERN_DEBUG "x25_sendmsg: Built header.\n");
+
+	if (sk->debug)
+		printk(KERN_DEBUG "x25_sendmsg: Transmitting buffer\n");
+
+	if (sk->state != TCP_ESTABLISHED) {
+		kfree_skb(skb, FREE_WRITE);
+		return -ENOTCONN;
+	}
+
+	x25_output(sk, skb);	/* Shove it onto the queue */
+
+	return len;
+}
+
+
+static int x25_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags, struct scm_cookie *scm)
+{
+	struct sock *sk = (struct sock *)sock->sk;
+	struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
+	int copied, qbit;
+	struct sk_buff *skb;
+	unsigned char *asmptr;
+	int er;
+
+	/*
+	 * This works for seqpacket too. The receiver has ordered the queue for
+	 * us! We do one quick check first though
+	 */
+	if (sk->state != TCP_ESTABLISHED)
+		return -ENOTCONN;
+
+	/* Now we can treat all alike */
+	if ((skb = skb_recv_datagram(sk, flags, msg->msg_flags & MSG_DONTWAIT, &er)) == NULL)
+		return er;
+
+	qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
+
+	skb_pull(skb, (sk->protinfo.x25->neighbour->extended) ? X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
+	skb->h.raw = skb->data;
+
+	if (sk->protinfo.x25->qbitincl) {
+		asmptr  = skb_push(skb, 1);
+		*asmptr = qbit;
+		skb->h.raw = skb->data;
+	}
+
+	copied = skb->len;
+	
+	if (copied > size) {
+		copied = size;
+		msg->msg_flags |= MSG_TRUNC;
+	}
+
+	skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+	
+	if (sx25 != NULL) {
+		struct sockaddr_x25 addr;
+		
+		addr.sx25_family = AF_X25;
+		addr.sx25_addr   = sk->protinfo.x25->dest_addr;
+
+		*sx25 = addr;
+	}
+
+	msg->msg_namelen = sizeof(struct sockaddr_x25);
+
+	skb_free_datagram(sk, skb);
+
+	return copied;
+}
+
+static int x25_shutdown(struct socket *sk, int how)
+{
+	return -EOPNOTSUPP;
+}
+
+static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	struct sock *sk = (struct sock *)sock->sk;
+	int err;
+	long amount = 0;
+
+	switch (cmd) {
+		case TIOCOUTQ:
+			if ((err = verify_area(VERIFY_WRITE, (void *)arg, sizeof(unsigned long))) != 0)
+				return err;
+			amount = sk->sndbuf - sk->wmem_alloc;
+			if (amount < 0)
+				amount = 0;
+			put_user(amount, (unsigned long *)arg);
+			return 0;
+
+		case TIOCINQ: {
+			struct sk_buff *skb;
+			/* These two are safe on a single CPU system as only user tasks fiddle here */
+			if ((skb = skb_peek(&sk->receive_queue)) != NULL)
+				amount = skb->len - 20;
+			if ((err = verify_area(VERIFY_WRITE, (void *)arg, sizeof(unsigned long))) != 0)
+				return err;
+			put_user(amount, (unsigned long *)arg);
+			return 0;
+		}
+
+		case SIOCGSTAMP:
+			if (sk != NULL) {
+				if (sk->stamp.tv_sec==0)
+					return -ENOENT;
+				if ((err = verify_area(VERIFY_WRITE,(void *)arg,sizeof(struct timeval))) != 0)
+					return err;
+				copy_to_user((void *)arg, &sk->stamp, sizeof(struct timeval));
+				return 0;
+			}
+			return -EINVAL;
+
+		case SIOCGIFADDR:
+		case SIOCSIFADDR:
+		case SIOCGIFDSTADDR:
+		case SIOCSIFDSTADDR:
+		case SIOCGIFBRDADDR:
+		case SIOCSIFBRDADDR:
+		case SIOCGIFNETMASK:
+		case SIOCSIFNETMASK:
+		case SIOCGIFMETRIC:
+		case SIOCSIFMETRIC:
+			return -EINVAL;
+
+		case SIOCADDRT:
+		case SIOCDELRT:
+			if (!suser()) return -EPERM;
+			return x25_route_ioctl(cmd, (void *)arg);
+
+		case SIOCX25SETSUBSCR:
+			if (!suser()) return -EPERM;
+			return x25_subscr_ioctl(cmd, (void *)arg);
+
+ 		default:
+			return dev_ioctl(cmd, (void *)arg);
+	}
+
+	/*NOTREACHED*/
+	return 0;
+}
+
+static int x25_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
+{
+	struct sock *s;
+	struct device *dev;
+	const char *devname;
+	int len = 0;
+	off_t pos = 0;
+	off_t begin = 0;
+  
+	cli();
+
+	len += sprintf(buffer, "dest_addr  src_addr   dev   lci st vs vr va   t  t2 t21 t22 t23 Snd-Q Rcv-Q\n");
+
+	for (s = x25_list; s != NULL; s = s->next) {
+		if (s->protinfo.x25->neighbour == NULL || (dev = s->protinfo.x25->neighbour->dev) == NULL)
+			devname = "???";
+		else
+			devname = s->protinfo.x25->neighbour->dev->name;
+
+		len += sprintf(buffer + len, "%-10s %-10s %-5s %3.3X  %d  %d  %d  %d %3d %3d %3d %3d %3d %5d %5d\n",
+			(s->protinfo.x25->dest_addr.x25_addr[0] == '\0')   ? "*" : s->protinfo.x25->dest_addr.x25_addr,
+			(s->protinfo.x25->source_addr.x25_addr[0] == '\0') ? "*" : s->protinfo.x25->source_addr.x25_addr,
+			devname,  s->protinfo.x25->lci & 0x0FFF,
+			s->protinfo.x25->state,
+			s->protinfo.x25->vs, s->protinfo.x25->vr, s->protinfo.x25->va,
+			s->protinfo.x25->timer / X25_SLOWHZ,
+			s->protinfo.x25->t2    / X25_SLOWHZ,
+			s->protinfo.x25->t21   / X25_SLOWHZ,
+			s->protinfo.x25->t22   / X25_SLOWHZ,
+			s->protinfo.x25->t23   / X25_SLOWHZ,
+			s->wmem_alloc, s->rmem_alloc);
+		
+		pos = begin + len;
+
+		if (pos < offset) {
+			len   = 0;
+			begin = pos;
+		}
+		
+		if (pos > offset + length)
+			break;
+	}
+
+	sti();
+
+	*start = buffer + (offset - begin);
+	len   -= (offset - begin);
+
+	if (len > length) len = length;
+
+	return(len);
+} 
+
+struct net_proto_family x25_family_ops = {
+	AF_X25,
+	x25_create
+};
+
+struct proto_ops x25_proto_ops = {
+	AF_X25,
+
+	x25_dup,
+	x25_release,
+	x25_bind,
+	x25_connect,
+	x25_socketpair,
+	x25_accept,
+	x25_getname,
+	datagram_select,
+	x25_ioctl,
+	x25_listen,
+	x25_shutdown,
+	x25_setsockopt,
+	x25_getsockopt,
+	x25_fcntl,
+	x25_sendmsg,
+	x25_recvmsg
+};
+
+static struct packet_type x25_packet_type =
+{
+	0,		/* MUTTER ntohs(ETH_P_X25),*/
+	0,		/* copy */
+	x25_llc_receive_frame,
+	NULL,
+	NULL,
+};
+
+struct notifier_block x25_dev_notifier = {
+	x25_device_event,
+	0
+};
+
+void x25_proto_init(struct net_proto *pro)
+{
+	sock_register(&x25_family_ops);
+
+	x25_packet_type.type = htons(ETH_P_X25);
+	dev_add_pack(&x25_packet_type);
+
+	register_netdevice_notifier(&x25_dev_notifier);
+
+	printk(KERN_INFO "X.25 for Linux. Version 0.1 for Linux 2.1.15\n");
+
+	x25_register_sysctl();
+
+#ifdef CONFIG_PROC_FS
+	proc_net_register(&(struct proc_dir_entry) {
+		PROC_NET_X25, 3, "x25",
+		S_IFREG | S_IRUGO, 1, 0, 0,
+		0, &proc_net_inode_operations, 
+		x25_get_info
+	});
+
+	proc_net_register(&(struct proc_dir_entry) {
+		PROC_NET_X25_LINKS, 9, "x25_links",
+		S_IFREG | S_IRUGO, 1, 0, 0,
+		0, &proc_net_inode_operations, 
+		x25_link_get_info
+	});
+
+	proc_net_register(&(struct proc_dir_entry) {
+		PROC_NET_X25_ROUTES, 10, "x25_routes",
+		S_IFREG | S_IRUGO, 1, 0, 0,
+		0, &proc_net_inode_operations, 
+		x25_routes_get_info
+	});
+#endif	
+}
+
+#ifdef MODULE
+
+int init_module(void)
+{
+	register_symtab(NULL);
+
+	x25_proto_init(NULL);
+	
+	return 0;
+}
+
+void cleanup_module(void)
+{
+
+#ifdef CONFIG_PROC_FS
+	proc_net_unregister(PROC_NET_X25);
+	proc_net_unregister(PROC_NET_X25_LINKS);
+	proc_net_unregister(PROC_NET_X25_ROUTES);
+#endif
+
+	x25_link_free();
+	x25_route_free();
+
+	x25_unregister_sysctl();
+
+	unregister_netdevice_notifier(&x25_dev_notifier);
+
+	dev_remove_pack(&x25_packet_type);
+
+	sock_unregister(x25_proto_ops.family);
+}
+
+#endif
+
+#endif