Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2611 insertions, 0 deletions

diff --git a/net/wanrouter/af_wanpipe.c b/net/wanrouter/af_wanpipe.c
new file mode 100644
index 000000000000..d93b19faaab7
--- /dev/null
+++ b/net/wanrouter/af_wanpipe.c
@@ -0,0 +1,2611 @@
+/*****************************************************************************
+* af_wanpipe.c	WANPIPE(tm) Secure Socket Layer.
+*
+* Author:	Nenad Corbic	<ncorbic@sangoma.com>
+*
+* Copyright:	(c) 2000 Sangoma Technologies Inc.
+*
+*		This program 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.
+* ============================================================================
+* Due Credit:
+*               Wanpipe socket layer is based on Packet and 
+*               the X25 socket layers. The above sockets were 
+*               used for the specific use of Sangoma Technoloiges 
+*               API programs. 
+*               Packet socket Authors: Ross Biro, Fred N. van Kempen and 
+*                                      Alan Cox.
+*               X25 socket Author: Jonathan Naylor.
+* ============================================================================
+* Mar 15, 2002  Arnaldo C. Melo  o Use wp_sk()->num, as it isnt anymore in sock
+* Apr 25, 2000  Nenad Corbic     o Added the ability to send zero length packets.
+* Mar 13, 2000  Nenad Corbic	 o Added a tx buffer check via ioctl call.
+* Mar 06, 2000  Nenad Corbic     o Fixed the corrupt sock lcn problem.
+*                                  Server and client applicaton can run
+*                                  simultaneously without conflicts.
+* Feb 29, 2000  Nenad Corbic     o Added support for PVC protocols, such as
+*                                  CHDLC, Frame Relay and HDLC API.
+* Jan 17, 2000 	Nenad Corbic	 o Initial version, based on AF_PACKET socket.
+*			           X25API support only. 
+*
+******************************************************************************/
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/fcntl.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/poll.h>
+#include <linux/wireless.h>
+#include <linux/kmod.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/wanpipe.h>
+#include <linux/if_wanpipe.h>
+#include <linux/pkt_sched.h>
+#include <linux/tcp.h>
+#include <linux/if_wanpipe_common.h>
+#include <linux/sdla_x25.h>
+
+#ifdef CONFIG_INET
+#include <net/inet_common.h>
+#endif
+
+#define SLOW_BACKOFF 0.1*HZ
+#define FAST_BACKOFF 0.01*HZ
+
+//#define PRINT_DEBUG
+#ifdef PRINT_DEBUG
+	#define DBG_PRINTK(format, a...) printk(format, ## a)
+#else
+	#define DBG_PRINTK(format, a...)
+#endif      
+
+
+/* SECURE SOCKET IMPLEMENTATION 
+ * 
+ *   TRANSMIT:
+ *
+ *      When the user sends a packet via send() system call
+ *      the wanpipe_sendmsg() function is executed.  
+ *      
+ *      Each packet is enqueud into sk->sk_write_queue transmit
+ *      queue. When the packet is enqueued, a delayed transmit
+ *      timer is triggerd which acts as a Bottom Half hander. 
+ *
+ *      wanpipe_delay_transmit() function (BH), dequeues packets
+ *      from the sk->sk_write_queue transmit queue and sends it 
+ *      to the deriver via dev->hard_start_xmit(skb, dev) function.  
+ *      Note, this function is actual a function pointer of if_send()
+ *      routine in the wanpipe driver.
+ *
+ *      X25API GUARANTEED DELIVERY:
+ *
+ *         In order to provide 100% guaranteed packet delivery, 
+ *         an atomic 'packet_sent' counter is implemented.  Counter 
+ *         is incremented for each packet enqueued 
+ *         into sk->sk_write_queue.  Counter is decremented each
+ *         time wanpipe_delayed_transmit() function successfuly 
+ *         passes the packet to the driver. Before each send(), a poll
+ *         routine checks the sock resources The maximum value of
+ *         packet sent counter is 1, thus if one packet is queued, the
+ *         application will block until that packet is passed to the
+ *         driver.
+ *
+ *   RECEIVE:
+ *
+ *      Wanpipe device drivers call the socket bottom half
+ *      function, wanpipe_rcv() to queue the incoming packets
+ *      into an AF_WANPIPE socket queue.  Based on wanpipe_rcv()
+ *      return code, the driver knows whether the packet was
+ *      successfully queued.  If the socket queue is full, 
+ *      protocol flow control is used by the driver, if any, 
+ *      to slow down the traffic until the sock queue is free.
+ *
+ *      Every time a packet arrives into a socket queue the 
+ *      socket wakes up processes which are waiting to receive
+ *      data.
+ *
+ *      If the socket queue is full, the driver sets a block
+ *      bit which signals the socket to kick the wanpipe driver
+ *      bottom half hander when the socket queue is partialy
+ *      empty. wanpipe_recvmsg() function performs this action.
+ * 
+ *      In case of x25api, packets will never be dropped, since
+ *      flow control is available. 
+ *      
+ *      In case of streaming protocols like CHDLC, packets will 
+ *      be dropped but the statistics will be generated. 
+ */
+
+
+/* The code below is used to test memory leaks. It prints out
+ * a message every time kmalloc and kfree system calls get executed.
+ * If the calls match there is no leak :)
+ */
+
+/***********FOR DEBUGGING PURPOSES*********************************************
+#define KMEM_SAFETYZONE 8
+
+static void * dbg_kmalloc(unsigned int size, int prio, int line) {
+	void * v = kmalloc(size,prio);
+	printk(KERN_INFO "line %d  kmalloc(%d,%d) = %p\n",line,size,prio,v);
+	return v;
+}
+static void dbg_kfree(void * v, int line) {
+	printk(KERN_INFO "line %d  kfree(%p)\n",line,v);
+	kfree(v);
+}
+
+#define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
+#define kfree(x) dbg_kfree(x,__LINE__)
+******************************************************************************/
+
+
+/* List of all wanpipe sockets. */
+HLIST_HEAD(wanpipe_sklist);
+static DEFINE_RWLOCK(wanpipe_sklist_lock);
+
+atomic_t wanpipe_socks_nr;
+static unsigned long wanpipe_tx_critical;
+
+#if 0
+/* Private wanpipe socket structures. */
+struct wanpipe_opt
+{
+	void   *mbox;		/* Mail box  */
+	void   *card; 		/* Card bouded to */
+	struct net_device *dev;	/* Bounded device */
+	unsigned short lcn;	/* Binded LCN */
+	unsigned char  svc;	/* 0=pvc, 1=svc */
+	unsigned char  timer;   /* flag for delayed transmit*/	
+	struct timer_list tx_timer;
+	unsigned poll_cnt;
+	unsigned char force;	/* Used to force sock release */
+	atomic_t packet_sent;   
+};
+#endif
+
+static int sk_count;
+extern struct proto_ops wanpipe_ops;
+static unsigned long find_free_critical;
+
+static void wanpipe_unlink_driver(struct sock *sk);
+static void wanpipe_link_driver(struct net_device *dev, struct sock *sk);
+static void wanpipe_wakeup_driver(struct sock *sk);
+static int execute_command(struct sock *, unsigned char, unsigned int);
+static int check_dev(struct net_device *dev, sdla_t *card);
+struct net_device *wanpipe_find_free_dev(sdla_t *card);
+static void wanpipe_unlink_card (struct sock *);
+static int wanpipe_link_card (struct sock *);
+static struct sock *wanpipe_make_new(struct sock *);
+static struct sock *wanpipe_alloc_socket(void);
+static inline int get_atomic_device(struct net_device *dev);
+static int wanpipe_exec_cmd(struct sock *, int, unsigned int);
+static int get_ioctl_cmd (struct sock *, void *);
+static int set_ioctl_cmd (struct sock *, void *);
+static void release_device(struct net_device *dev);
+static void wanpipe_kill_sock_timer (unsigned long data);
+static void wanpipe_kill_sock_irq (struct sock *);
+static void wanpipe_kill_sock_accept (struct sock *);
+static int wanpipe_do_bind(struct sock *sk, struct net_device *dev,
+			   int protocol);
+struct sock * get_newsk_from_skb (struct sk_buff *);
+static int wanpipe_debug (struct sock *, void *);
+static void wanpipe_delayed_transmit (unsigned long data);
+static void release_driver(struct sock *);
+static void start_cleanup_timer (struct sock *);
+static void check_write_queue(struct sock *);
+static int check_driver_busy (struct sock *);
+
+/*============================================================
+ * wanpipe_rcv
+ *
+ *	Wanpipe socket bottom half handler.  This function
+ *      is called by the WANPIPE device drivers to queue a
+ *      incoming packet into the socket receive queue. 
+ *      Once the packet is queued, all processes waiting to 
+ *      read are woken up.
+ *
+ *      During socket bind, this function is bounded into
+ *      WANPIPE driver private.
+ *===========================================================*/
+
+static int wanpipe_rcv(struct sk_buff *skb, struct net_device *dev,
+		       struct sock *sk)
+{
+	struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb;
+	wanpipe_common_t *chan = dev->priv;
+	/*
+	 *	When we registered the protocol we saved the socket in the data
+	 *	field for just this event.
+	 */
+
+	skb->dev = dev;
+
+	sll->sll_family = AF_WANPIPE;
+	sll->sll_hatype = dev->type;
+	sll->sll_protocol = skb->protocol;
+	sll->sll_pkttype = skb->pkt_type;
+	sll->sll_ifindex = dev->ifindex;
+	sll->sll_halen = 0;
+
+	if (dev->hard_header_parse)
+		sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
+
+	/* 
+	 * WAN_PACKET_DATA : Data which should be passed up the receive queue.
+         * WAN_PACKET_ASYC : Asynchronous data like place call, which should
+         *                   be passed up the listening sock.
+         * WAN_PACKET_ERR  : Asynchronous data like clear call or restart 
+         *                   which should go into an error queue.
+         */
+	switch (skb->pkt_type){
+
+		case WAN_PACKET_DATA:
+			if (sock_queue_rcv_skb(sk,skb)<0){
+				return -ENOMEM;
+			}
+			break;
+		case WAN_PACKET_CMD:
+			sk->sk_state = chan->state;
+			/* Bug fix: update Mar6. 
+                         * Do not set the sock lcn number here, since
+         		 * cmd is not guaranteed to be executed on the
+                         * board, thus Lcn could be wrong */
+			sk->sk_data_ready(sk, skb->len);
+			kfree_skb(skb);
+			break;
+		case WAN_PACKET_ERR:
+			sk->sk_state = chan->state;
+			if (sock_queue_err_skb(sk,skb)<0){
+				return -ENOMEM;
+			}
+			break;
+		default:
+			printk(KERN_INFO "wansock: BH Illegal Packet Type Dropping\n");
+			kfree_skb(skb); 
+			break;
+	}
+
+//??????????????????????
+//	if (sk->sk_state == WANSOCK_DISCONNECTED){
+//		if (sk->sk_zapped) {
+//			//printk(KERN_INFO "wansock: Disconnected, killing early\n");
+//			wanpipe_unlink_driver(sk);
+//			sk->sk_bound_dev_if = 0;
+//		}
+//	}
+
+	return 0;
+}
+
+/*============================================================
+ * wanpipe_listen_rcv
+ *
+ *	Wanpipe LISTEN socket bottom half handler.  This function
+ *      is called by the WANPIPE device drivers to queue an
+ *      incoming call into the socket listening queue. 
+ *      Once the packet is queued, the waiting accept() process 
+ *      is woken up.
+ *
+ *      During socket bind, this function is bounded into
+ *      WANPIPE driver private. 
+ * 
+ *      IMPORTANT NOTE:
+ *          The accept call() is waiting for an skb packet
+ *          which contains a pointer to a device structure.
+ *
+ *          When we do a bind to a device structre, we 
+ *          bind a newly created socket into "chan->sk".  Thus, 
+ *          when accept receives the skb packet, it will know 
+ *          from which dev it came form, and in turn it will know
+ *          the address of the new sock.
+ *
+ *  	NOTE: This function gets called from driver ISR.
+ *===========================================================*/
+
+static int wanpipe_listen_rcv (struct sk_buff *skb,  struct sock *sk)
+{
+	wanpipe_opt *wp = wp_sk(sk), *newwp;
+	struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb;
+	struct sock *newsk;
+	struct net_device *dev; 
+	sdla_t *card;
+	mbox_cmd_t *mbox_ptr;
+	wanpipe_common_t *chan;
+
+	/* Find a free device, if none found, all svc's are busy 
+         */
+
+	card = (sdla_t*)wp->card;
+	if (!card){
+		printk(KERN_INFO "wansock: LISTEN ERROR, No Card\n");
+		return -ENODEV;
+	}
+	
+	dev = wanpipe_find_free_dev(card);
+	if (!dev){
+		printk(KERN_INFO "wansock: LISTEN ERROR, No Free Device\n");
+		return -ENODEV;
+	}
+
+	chan=dev->priv;	
+	chan->state = WANSOCK_CONNECTING;
+
+	/* Allocate a new sock, which accept will bind
+         * and pass up to the user 
+	 */
+	if ((newsk = wanpipe_make_new(sk)) == NULL){
+		release_device(dev);
+		return -ENOMEM;
+	}
+
+
+	/* Initialize the new sock structure 
+	 */
+	newsk->sk_bound_dev_if = dev->ifindex;
+	newwp = wp_sk(newsk);
+	newwp->card = wp->card;
+
+	/* Insert the sock into the main wanpipe
+         * sock list.
+         */
+	atomic_inc(&wanpipe_socks_nr);
+
+	/* Allocate and fill in the new Mail Box. Then
+         * bind the mail box to the sock. It will be 
+         * used by the ioctl call to read call information
+         * and to execute commands. 
+         */	
+	if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL) {
+		wanpipe_kill_sock_irq (newsk);
+		release_device(dev);		
+		return -ENOMEM;
+	}
+	memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
+	memcpy(mbox_ptr,skb->data,skb->len);
+
+	/* Register the lcn on which incoming call came
+         * from. Thus, if we have to clear it, we know
+         * which lcn to clear
+	 */ 
+
+	newwp->lcn = mbox_ptr->cmd.lcn;
+	newwp->mbox = (void *)mbox_ptr;
+
+	DBG_PRINTK(KERN_INFO "NEWSOCK : Device %s, bind to lcn %i\n",
+			dev->name,mbox_ptr->cmd.lcn);
+
+	chan->lcn = mbox_ptr->cmd.lcn;
+	card->u.x.svc_to_dev_map[(chan->lcn%MAX_X25_LCN)] = dev;
+
+	sock_reset_flag(newsk, SOCK_ZAPPED);
+	newwp->num = htons(X25_PROT);
+
+	if (wanpipe_do_bind(newsk, dev, newwp->num)) {
+		wanpipe_kill_sock_irq (newsk);
+		release_device(dev);
+		return -EINVAL;
+	}
+	newsk->sk_state = WANSOCK_CONNECTING;
+
+
+	/* Fill in the standard sock address info */
+
+	sll->sll_family = AF_WANPIPE;
+	sll->sll_hatype = dev->type;
+	sll->sll_protocol = skb->protocol;
+	sll->sll_pkttype = skb->pkt_type;
+	sll->sll_ifindex = dev->ifindex;
+	sll->sll_halen = 0;
+
+	skb->dev = dev;
+	sk->sk_ack_backlog++;
+
+	/* We must do this manually, since the sock_queue_rcv_skb()
+	 * function sets the skb->dev to NULL.  However, we use
+	 * the dev field in the accept function.*/ 
+	if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 
+	    (unsigned)sk->sk_rcvbuf) {
+
+         	wanpipe_unlink_driver(newsk);
+		wanpipe_kill_sock_irq (newsk);
+		--sk->sk_ack_backlog;
+		return -ENOMEM;
+	}	
+
+	skb_set_owner_r(skb, sk);
+	skb_queue_tail(&sk->sk_receive_queue, skb);
+	sk->sk_data_ready(sk, skb->len);
+	
+	return 0;
+}
+
+
+
+/*============================================================
+ * wanpipe_make_new
+ *
+ *	Create a new sock, and allocate a wanpipe private
+ *      structure to it. Also, copy the important data
+ *      from the original sock to the new sock.
+ *
+ *      This function is used by wanpipe_listen_rcv() listen
+ *      bottom half handler.  A copy of the listening sock
+ *      is created using this function.
+ *
+ *===========================================================*/
+
+static struct sock *wanpipe_make_new(struct sock *osk)
+{
+	struct sock *sk;
+
+	if (osk->sk_type != SOCK_RAW)
+		return NULL;
+
+	if ((sk = wanpipe_alloc_socket()) == NULL)
+		return NULL;
+
+	sk->sk_type	= osk->sk_type;
+	sk->sk_socket	= osk->sk_socket;
+	sk->sk_priority	= osk->sk_priority;
+	sk->sk_protocol	= osk->sk_protocol;
+	wp_sk(sk)->num	= wp_sk(osk)->num;
+	sk->sk_rcvbuf	= osk->sk_rcvbuf;
+	sk->sk_sndbuf	= osk->sk_sndbuf;
+	sk->sk_state	= WANSOCK_CONNECTING;
+	sk->sk_sleep	= osk->sk_sleep;
+
+	if (sock_flag(osk, SOCK_DBG))
+		sock_set_flag(sk, SOCK_DBG);
+
+	return sk;
+}
+
+/* 
+ * FIXME: wanpipe_opt has to include a sock in its definition and stop using
+ * sk_protinfo, but this code is not even compilable now, so lets leave it for
+ * later.
+ */
+static struct proto wanpipe_proto = {
+	.name	  = "WANPIPE",
+	.owner	  = THIS_MODULE,
+	.obj_size = sizeof(struct sock),
+};
+
+/*============================================================
+ * wanpipe_make_new
+ *
+ *	Allocate memory for the a new sock, and sock
+ *      private data.  
+ *	
+ *	Increment the module use count.
+ *       	
+ *      This function is used by wanpipe_create() and 
+ *      wanpipe_make_new() functions. 
+ *
+ *===========================================================*/
+
+static struct sock *wanpipe_alloc_socket(void)
+{
+	struct sock *sk;
+	struct wanpipe_opt *wan_opt;
+
+	if ((sk = sk_alloc(PF_WANPIPE, GFP_ATOMIC, &wanpipe_proto, 1)) == NULL)
+		return NULL;
+
+	if ((wan_opt = kmalloc(sizeof(struct wanpipe_opt), GFP_ATOMIC)) == NULL) {
+		sk_free(sk);
+		return NULL;
+	}
+	memset(wan_opt, 0x00, sizeof(struct wanpipe_opt));
+
+	wp_sk(sk) = wan_opt;
+
+	/* Use timer to send data to the driver. This will act
+         * as a BH handler for sendmsg functions */
+	init_timer(&wan_opt->tx_timer);
+	wan_opt->tx_timer.data	   = (unsigned long)sk;
+	wan_opt->tx_timer.function = wanpipe_delayed_transmit;
+
+	sock_init_data(NULL, sk);
+	return sk;
+}
+
+
+/*============================================================
+ * wanpipe_sendmsg
+ *
+ *	This function implements a sendto() system call,
+ *      for AF_WANPIPE socket family. 
+ *      During socket bind() sk->sk_bound_dev_if is initialized
+ *      to a correct network device. This number is used
+ *      to find a network device to which the packet should
+ *      be passed to.
+ *
+ *      Each packet is queued into sk->sk_write_queue and 
+ *      delayed transmit bottom half handler is marked for 
+ *      execution.
+ *
+ *      A socket must be in WANSOCK_CONNECTED state before
+ *      a packet is queued into sk->sk_write_queue.
+ *===========================================================*/
+
+static int wanpipe_sendmsg(struct kiocb *iocb, struct socket *sock,
+			   struct msghdr *msg, int len)
+{
+	wanpipe_opt *wp;
+	struct sock *sk = sock->sk;
+	struct wan_sockaddr_ll *saddr=(struct wan_sockaddr_ll *)msg->msg_name;
+	struct sk_buff *skb;
+	struct net_device *dev;
+	unsigned short proto;
+	unsigned char *addr;
+	int ifindex, err, reserve = 0;
+
+	
+	if (!sock_flag(sk, SOCK_ZAPPED))
+		return -ENETDOWN;
+
+	if (sk->sk_state != WANSOCK_CONNECTED)
+		return -ENOTCONN;	
+
+	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) 
+		return(-EINVAL);
+
+	/* it was <=, now one can send
+         * zero length packets */
+	if (len < sizeof(x25api_hdr_t))
+		return -EINVAL;
+
+	wp = wp_sk(sk);
+
+	if (saddr == NULL) {
+		ifindex	= sk->sk_bound_dev_if;
+		proto	= wp->num;
+		addr	= NULL;
+
+	}else{
+		if (msg->msg_namelen < sizeof(struct wan_sockaddr_ll)){ 
+			return -EINVAL;
+		}
+
+		ifindex = sk->sk_bound_dev_if;
+		proto	= saddr->sll_protocol;
+		addr	= saddr->sll_addr;
+	}
+
+	dev = dev_get_by_index(ifindex);
+	if (dev == NULL){
+		printk(KERN_INFO "wansock: Send failed, dev index: %i\n",ifindex);
+		return -ENXIO;
+	}
+	dev_put(dev);
+	
+	if (sock->type == SOCK_RAW)
+		reserve = dev->hard_header_len;
+
+	if (len > dev->mtu+reserve){
+  		return -EMSGSIZE;
+	}
+
+	skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev),
+				msg->msg_flags & MSG_DONTWAIT, &err);
+
+	if (skb==NULL){
+		goto out_unlock;
+	}
+		
+	skb_reserve(skb, LL_RESERVED_SPACE(dev));
+	skb->nh.raw = skb->data;
+
+	/* Returns -EFAULT on error */
+	err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
+	if (err){
+		goto out_free;
+	}
+
+	if (dev->hard_header) {
+		int res;
+		err = -EINVAL;
+		res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len);
+		if (res<0){
+			goto out_free;
+		}
+	}
+
+	skb->protocol = proto;
+	skb->dev = dev;
+	skb->priority = sk->sk_priority;
+	skb->pkt_type = WAN_PACKET_DATA;
+
+	err = -ENETDOWN;
+	if (!(dev->flags & IFF_UP))
+		goto out_free;
+
+	if (atomic_read(&sk->sk_wmem_alloc) + skb->truesize >
+	    (unsigned int)sk->sk_sndbuf){
+		kfree_skb(skb);
+		return -ENOBUFS;
+	}
+
+	skb_queue_tail(&sk->sk_write_queue,skb);
+	atomic_inc(&wp->packet_sent);
+
+	if (!(test_and_set_bit(0, &wp->timer)))
+		mod_timer(&wp->tx_timer, jiffies + 1);
+	
+	return(len);
+
+out_free:
+	kfree_skb(skb);
+out_unlock:
+	return err;
+}
+
+/*============================================================
+ * wanpipe_delayed_tarnsmit
+ *
+ *	Transmit bottom half handler. It dequeues packets
+ *      from sk->sk_write_queue and passes them to the 
+ *      driver.  If the driver is busy, the packet is 
+ *      re-enqueued.  
+ *
+ *      Packet Sent counter is decremented on successful
+ *      transmission. 
+ *===========================================================*/
+
+
+static void wanpipe_delayed_transmit (unsigned long data)
+{
+	struct sock *sk=(struct sock *)data;
+	struct sk_buff *skb;
+	wanpipe_opt *wp = wp_sk(sk);
+	struct net_device *dev = wp->dev;
+	sdla_t *card = (sdla_t*)wp->card;
+
+	if (!card || !dev){
+		clear_bit(0, &wp->timer);
+		DBG_PRINTK(KERN_INFO "wansock: Transmit delay, no dev or card\n");
+		return;
+	}
+	
+	if (sk->sk_state != WANSOCK_CONNECTED || !sock_flag(sk, SOCK_ZAPPED)) {
+		clear_bit(0, &wp->timer);
+		DBG_PRINTK(KERN_INFO "wansock: Tx Timer, State not CONNECTED\n");
+		return;
+	}
+	
+	/* If driver is executing command, we must offload
+         * the board by not sending data. Otherwise a 
+         * pending command will never get a free buffer
+         * to execute */ 	
+	if (atomic_read(&card->u.x.command_busy)){
+		wp->tx_timer.expires = jiffies + SLOW_BACKOFF;
+		add_timer(&wp->tx_timer);
+		DBG_PRINTK(KERN_INFO "wansock: Tx Timer, command bys BACKOFF\n");
+		return;
+	}
+
+	
+	if (test_and_set_bit(0,&wanpipe_tx_critical)){
+		printk(KERN_INFO "WanSock: Tx timer critical %s\n",dev->name);
+		wp->tx_timer.expires = jiffies + SLOW_BACKOFF;
+		add_timer(&wp->tx_timer);
+		return;
+	}	
+	
+	/* Check for a packet in the fifo and send */
+	if ((skb = skb_dequeue(&sk->sk_write_queue)) != NULL){
+
+		if (dev->hard_start_xmit(skb, dev) != 0){			
+
+			/* Driver failed to transmit, re-enqueue
+                         * the packet and retry again later */
+			skb_queue_head(&sk->sk_write_queue,skb);
+			clear_bit(0,&wanpipe_tx_critical);
+			return;
+		}else{
+
+			/* Packet Sent successful. Check for more packets
+                         * if more packets, re-trigger the transmit routine 
+                         * other wise exit
+                         */
+			atomic_dec(&wp->packet_sent);
+
+			if (skb_peek(&sk->sk_write_queue) == NULL) {
+				/* If there is nothing to send, kick
+				 * the poll routine, which will trigger
+				 * the application to send more data */
+				sk->sk_data_ready(sk, 0);
+				clear_bit(0, &wp->timer);
+			}else{
+				/* Reschedule as fast as possible */
+				wp->tx_timer.expires = jiffies + 1;
+				add_timer(&wp->tx_timer);
+			}
+		}
+	}
+	clear_bit(0,&wanpipe_tx_critical);
+}
+
+/*============================================================
+ * execute_command 
+ *
+ *	Execute x25api commands.  The atomic variable
+ *      chan->command is used to indicate to the driver that
+ *      command is pending for execution.  The acutal command
+ *      structure is placed into a sock mbox structure 
+ *      (wp_sk(sk)->mbox).
+ *
+ *      The sock private structure, mbox is
+ *      used as shared memory between sock and the driver.
+ *      Driver uses the sock mbox to execute the command
+ *      and return the result.  
+ *
+ *      For all command except PLACE CALL, the function
+ *      waits for the result.  PLACE CALL can be ether
+ *      blocking or nonblocking. The user sets this option
+ *      via ioctl call.
+ *===========================================================*/
+
+
+static int execute_command(struct sock *sk,  unsigned char cmd, unsigned int flags)
+{
+	wanpipe_opt *wp = wp_sk(sk);
+	struct net_device *dev;
+	wanpipe_common_t *chan=NULL;
+	int err=0;
+	DECLARE_WAITQUEUE(wait, current);
+	
+	dev = dev_get_by_index(sk->sk_bound_dev_if);
+	if (dev == NULL){
+		printk(KERN_INFO "wansock: Exec failed no dev %i\n",
+			sk->sk_bound_dev_if);
+		return -ENODEV;
+	}
+	dev_put(dev);
+
+	if ((chan=dev->priv) == NULL){
+		printk(KERN_INFO "wansock: Exec cmd failed no priv area\n");
+		return -ENODEV;
+	}
+
+	if (atomic_read(&chan->command)){
+		printk(KERN_INFO "wansock: ERROR: Command already running %x, %s\n",
+			atomic_read(&chan->command),dev->name);
+		return -EINVAL;
+	}
+
+	if (!wp->mbox) {
+		printk(KERN_INFO "wansock: In execute without MBOX\n");
+		return -EINVAL;
+	}
+
+	((mbox_cmd_t*)wp->mbox)->cmd.command = cmd;	
+	((mbox_cmd_t*)wp->mbox)->cmd.lcn     = wp->lcn;
+	((mbox_cmd_t*)wp->mbox)->cmd.result  = 0x7F;
+
+
+	if (flags & O_NONBLOCK){
+		cmd |= 0x80;
+		atomic_set(&chan->command, cmd);
+	}else{
+		atomic_set(&chan->command, cmd);
+	}
+
+	add_wait_queue(sk->sk_sleep,&wait);
+	current->state = TASK_INTERRUPTIBLE;
+	for (;;){
+		if (((mbox_cmd_t*)wp->mbox)->cmd.result != 0x7F) {
+			err = 0;
+			break;
+		}
+		if (signal_pending(current)) {
+			err = -ERESTARTSYS;
+			break;
+		}
+		schedule();
+	}
+	current->state = TASK_RUNNING;
+	remove_wait_queue(sk->sk_sleep,&wait);
+	
+	return err;
+}
+
+/*============================================================
+ * wanpipe_destroy_timer 
+ *
+ *	Used by wanpipe_release, to delay release of
+ *      the socket.
+ *===========================================================*/
+
+static void wanpipe_destroy_timer(unsigned long data)
+{
+	struct sock *sk=(struct sock *)data;
+	wanpipe_opt *wp = wp_sk(sk);
+
+	if ((!atomic_read(&sk->sk_wmem_alloc) &&
+	     !atomic_read(&sk->sk_rmem_alloc)) ||
+	    (++wp->force == 5)) {
+
+		if (atomic_read(&sk->sk_wmem_alloc) ||
+		    atomic_read(&sk->sk_rmem_alloc))
+			printk(KERN_INFO "wansock: Warning, Packet Discarded due to sock shutdown!\n");
+
+		kfree(wp);
+		wp_sk(sk) = NULL;
+		
+		if (atomic_read(&sk->sk_refcnt) != 1) {
+			atomic_set(&sk->sk_refcnt, 1);
+			DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :delay.\n",
+					atomic_read(&sk->sk_refcnt));
+		}
+		sock_put(sk);
+		atomic_dec(&wanpipe_socks_nr);
+		return;
+	}
+
+	sk->sk_timer.expires = jiffies + 5 * HZ;
+	add_timer(&sk->sk_timer);
+	printk(KERN_INFO "wansock: packet sk destroy delayed\n");
+}
+
+/*============================================================
+ * wanpipe_unlink_driver
+ *
+ * 	When the socket is released, this function is 
+ *      used to remove links that bind the sock and the
+ *      driver together.  
+ *===========================================================*/
+static void wanpipe_unlink_driver (struct sock *sk)
+{
+	struct net_device *dev;
+	wanpipe_common_t *chan=NULL;
+
+	sock_reset_flag(sk, SOCK_ZAPPED);
+	sk->sk_state = WANSOCK_DISCONNECTED;
+	wp_sk(sk)->dev = NULL;
+
+	dev = dev_get_by_index(sk->sk_bound_dev_if);
+	if (!dev){
+		printk(KERN_INFO "wansock: No dev on release\n");
+		return;
+	}			
+	dev_put(dev);
+
+	if ((chan = dev->priv) == NULL){
+		printk(KERN_INFO "wansock: No Priv Area on release\n");
+		return;
+	}
+
+	set_bit(0,&chan->common_critical);
+	chan->sk=NULL;
+	chan->func=NULL;
+	chan->mbox=NULL;
+	chan->tx_timer=NULL;
+	clear_bit(0,&chan->common_critical);
+	release_device(dev);
+	
+	return;
+}
+
+/*============================================================
+ * wanpipe_link_driver
+ *
+ * 	Upon successful bind(), sock is linked to a driver
+ *      by binding in the wanpipe_rcv() bottom half handler
+ *      to the driver function pointer, as well as sock and
+ *      sock mailbox addresses.  This way driver can pass
+ *      data up the socket.
+ *===========================================================*/
+
+static void wanpipe_link_driver(struct net_device *dev, struct sock *sk)
+{
+	wanpipe_opt *wp = wp_sk(sk);
+	wanpipe_common_t *chan = dev->priv;
+	if (!chan)
+		return;
+	set_bit(0,&chan->common_critical);
+	chan->sk=sk;
+	chan->func=wanpipe_rcv;
+	chan->mbox = wp->mbox;
+	chan->tx_timer = &wp->tx_timer;
+	wp->dev = dev;
+	sock_set_flag(sk, SOCK_ZAPPED);
+	clear_bit(0,&chan->common_critical);
+}
+
+
+/*============================================================
+ * release_device
+ *
+ *   	During sock release, clear a critical bit, which 
+ *      marks the device a being taken.
+ *===========================================================*/
+
+
+static void release_device(struct net_device *dev)
+{
+	wanpipe_common_t *chan=dev->priv;
+	clear_bit(0,(void*)&chan->rw_bind);
+}
+
+/*============================================================
+ * wanpipe_release
+ *
+ *	Close a PACKET socket. This is fairly simple. We 
+ *      immediately go to 'closed' state and remove our 
+ *      protocol entry in the device list.
+ *===========================================================*/
+
+static int wanpipe_release(struct socket *sock)
+{
+	wanpipe_opt *wp;
+	struct sock *sk = sock->sk;
+	
+	if (!sk)
+		return 0;
+
+	wp = wp_sk(sk);
+	check_write_queue(sk);
+
+	/* Kill the tx timer, if we don't kill it now, the timer
+         * will run after we kill the sock.  Timer code will 
+         * try to access the sock which has been killed and cause
+         * kernel panic */
+
+	del_timer(&wp->tx_timer);
+
+	/*
+	 *	Unhook packet receive handler.
+	 */
+
+	if (wp->num == htons(X25_PROT) &&
+	    sk->sk_state != WANSOCK_DISCONNECTED && sock_flag(sk, SOCK_ZAPPED)) {
+		struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
+		wanpipe_common_t *chan;
+		if (dev){
+			chan=dev->priv;
+			atomic_set(&chan->disconnect,1);
+			DBG_PRINTK(KERN_INFO "wansock: Sending Clear Indication %i\n",
+					sk->sk_state);
+			dev_put(dev);
+		}	
+	}
+
+	set_bit(1,&wanpipe_tx_critical);
+	write_lock(&wanpipe_sklist_lock);
+	sk_del_node_init(sk);
+	write_unlock(&wanpipe_sklist_lock);
+	clear_bit(1,&wanpipe_tx_critical);
+
+
+	
+	release_driver(sk);
+
+	
+	/*
+	 *	Now the socket is dead. No more input will appear.
+	 */
+
+	sk->sk_state_change(sk);	/* It is useless. Just for sanity. */
+
+	sock->sk = NULL;
+	sk->sk_socket = NULL;
+	sock_set_flag(sk, SOCK_DEAD);
+
+	/* Purge queues */
+	skb_queue_purge(&sk->sk_receive_queue);
+	skb_queue_purge(&sk->sk_write_queue);
+	skb_queue_purge(&sk->sk_error_queue);
+
+	if (atomic_read(&sk->sk_rmem_alloc) ||
+	    atomic_read(&sk->sk_wmem_alloc)) {
+		del_timer(&sk->sk_timer);
+		printk(KERN_INFO "wansock: Killing in Timer R %i , W %i\n",
+			atomic_read(&sk->sk_rmem_alloc),
+			atomic_read(&sk->sk_wmem_alloc));
+		sk->sk_timer.data	= (unsigned long)sk;
+		sk->sk_timer.expires	= jiffies + HZ;
+		sk->sk_timer.function	= wanpipe_destroy_timer;
+		add_timer(&sk->sk_timer);
+		return 0;
+	}
+
+	kfree(wp);
+	wp_sk(sk) = NULL;
+
+	if (atomic_read(&sk->sk_refcnt) != 1) {
+		DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:release.\n",
+					atomic_read(&sk->sk_refcnt));
+		atomic_set(&sk->sk_refcnt, 1);
+	}
+	sock_put(sk);
+	atomic_dec(&wanpipe_socks_nr);
+	return 0;
+}
+
+/*============================================================
+ * check_write_queue
+ *
+ *  	During sock shutdown, if the sock state is 
+ *      WANSOCK_CONNECTED and there is transmit data 
+ *      pending. Wait until data is released 
+ *      before proceeding.
+ *===========================================================*/
+
+static void check_write_queue(struct sock *sk)
+{
+
+	if (sk->sk_state != WANSOCK_CONNECTED)
+		return;
+
+	if (!atomic_read(&sk->sk_wmem_alloc))
+		return;
+
+	printk(KERN_INFO "wansock: MAJOR ERROR, Data lost on sock release !!!\n");
+
+}
+
+/*============================================================
+ * release_driver
+ *
+ *	This function is called during sock shutdown, to 
+ *      release any resources and links that bind the sock
+ *      to the driver.  It also changes the state of the
+ *      sock to WANSOCK_DISCONNECTED
+ *===========================================================*/
+
+static void release_driver(struct sock *sk)
+{
+	wanpipe_opt *wp;
+	struct sk_buff *skb=NULL;
+	struct sock *deadsk=NULL;
+
+	if (sk->sk_state == WANSOCK_LISTEN ||
+	    sk->sk_state == WANSOCK_BIND_LISTEN) {
+		while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+			if ((deadsk = get_newsk_from_skb(skb))){
+				DBG_PRINTK (KERN_INFO "wansock: RELEASE: FOUND DEAD SOCK\n");
+				sock_set_flag(deadsk, SOCK_DEAD);
+				start_cleanup_timer(deadsk);
+			}
+			kfree_skb(skb);
+		}
+		if (sock_flag(sk, SOCK_ZAPPED))
+			wanpipe_unlink_card(sk);
+	}else{
+		if (sock_flag(sk, SOCK_ZAPPED))
+			wanpipe_unlink_driver(sk);
+	}
+	sk->sk_state	    = WANSOCK_DISCONNECTED;
+	sk->sk_bound_dev_if = 0;
+	sock_reset_flag(sk, SOCK_ZAPPED);
+	wp = wp_sk(sk);
+
+	if (wp && wp->mbox) {
+		kfree(wp->mbox);
+		wp->mbox = NULL;
+	}
+}
+
+/*============================================================
+ *  start_cleanup_timer
+ *
+ *  	If new incoming call's are pending but the socket
+ *      is being released, start the timer which will 
+ *      envoke the kill routines for pending socks.
+ *===========================================================*/
+
+
+static void start_cleanup_timer (struct sock *sk)
+{
+	del_timer(&sk->sk_timer);
+	sk->sk_timer.data	= (unsigned long)sk;
+	sk->sk_timer.expires	= jiffies + HZ;
+	sk->sk_timer.function	= wanpipe_kill_sock_timer;
+	add_timer(&sk->sk_timer);
+}
+
+
+/*============================================================
+ *  wanpipe_kill_sock
+ *
+ *	This is a function which performs actual killing
+ *      of the sock.  It releases socket resources,
+ *      and unlinks the sock from the driver. 
+ *===========================================================*/
+
+static void wanpipe_kill_sock_timer (unsigned long data)
+{
+
+	struct sock *sk = (struct sock *)data;
+	struct sock **skp;
+
+	if (!sk)
+		return;
+
+	/* This function can be called from interrupt. We must use
+	 * appropriate locks */
+	
+	if (test_bit(1,&wanpipe_tx_critical)){
+		sk->sk_timer.expires = jiffies + 10;
+		add_timer(&sk->sk_timer);
+		return;
+	}
+	
+	write_lock(&wanpipe_sklist_lock);
+	sk_del_node_init(sk);
+	write_unlock(&wanpipe_sklist_lock);
+
+
+	if (wp_sk(sk)->num == htons(X25_PROT) &&
+	    sk->sk_state != WANSOCK_DISCONNECTED) {
+		struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
+		wanpipe_common_t *chan;
+		if (dev){
+			chan=dev->priv;
+			atomic_set(&chan->disconnect,1);
+			dev_put(dev);
+		}	
+	}
+
+	release_driver(sk);
+
+	sk->sk_socket = NULL;
+
+	/* Purge queues */
+	skb_queue_purge(&sk->sk_receive_queue);
+	skb_queue_purge(&sk->sk_write_queue);
+	skb_queue_purge(&sk->sk_error_queue);
+	
+	if (atomic_read(&sk->sk_rmem_alloc) ||
+	    atomic_read(&sk->sk_wmem_alloc)) {
+		del_timer(&sk->sk_timer);
+		printk(KERN_INFO "wansock: Killing SOCK in Timer\n");
+		sk->sk_timer.data	= (unsigned long)sk;
+		sk->sk_timer.expires	= jiffies + HZ;
+		sk->sk_timer.function	= wanpipe_destroy_timer;
+		add_timer(&sk->sk_timer);
+		return;
+	}
+
+	if (wp_sk(sk)) {
+		kfree(wp_sk(sk));
+		wp_sk(sk) = NULL;
+	}
+
+	if (atomic_read(&sk->sk_refcnt) != 1) {
+		atomic_set(&sk->sk_refcnt, 1);
+		DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n",
+					atomic_read(&sk->sk_refcnt));
+	}
+	sock_put(sk);
+	atomic_dec(&wanpipe_socks_nr);
+	return;
+}
+
+static void wanpipe_kill_sock_accept (struct sock *sk)
+{
+
+	struct sock **skp;
+
+	if (!sk)
+		return;
+
+	/* This function can be called from interrupt. We must use
+	 * appropriate locks */
+	
+	write_lock(&wanpipe_sklist_lock);
+	sk_del_node_init(sk);
+	write_unlock(&wanpipe_sklist_lock);
+
+	sk->sk_socket = NULL;
+
+
+	if (wp_sk(sk)) {
+		kfree(wp_sk(sk));
+		wp_sk(sk) = NULL;
+	}
+
+	if (atomic_read(&sk->sk_refcnt) != 1) {
+		atomic_set(&sk->sk_refcnt, 1);
+		DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n",
+					atomic_read(&sk->sk_refcnt));
+	}
+	sock_put(sk);
+	atomic_dec(&wanpipe_socks_nr);
+	return;
+}
+
+
+static void wanpipe_kill_sock_irq (struct sock *sk)
+{
+
+	if (!sk)
+		return;
+
+	sk->sk_socket = NULL;
+
+	if (wp_sk(sk)) {
+		kfree(wp_sk(sk));
+		wp_sk(sk) = NULL;
+	}
+
+	if (atomic_read(&sk->sk_refcnt) != 1) {
+		atomic_set(&sk->sk_refcnt, 1);
+		DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:listen.\n",
+					atomic_read(&sk->sk_refcnt));
+	}
+	sock_put(sk);
+	atomic_dec(&wanpipe_socks_nr);
+}
+
+
+/*============================================================
+ *  wanpipe_do_bind
+ *
+ * 	Bottom half of the binding system call.
+ *      Once the wanpipe_bind() function checks  the
+ *      legality of the call, this function binds the
+ *      sock to the driver.
+ *===========================================================*/
+
+static int wanpipe_do_bind(struct sock *sk, struct net_device *dev,
+			   int protocol)
+{
+	wanpipe_opt *wp = wp_sk(sk);
+	wanpipe_common_t *chan=NULL;
+	int err=0;
+
+	if (sock_flag(sk, SOCK_ZAPPED)) {
+		err = -EALREADY;
+		goto bind_unlock_exit;
+	}
+
+	wp->num = protocol;
+
+	if (protocol == 0){
+		release_device(dev);
+		err = -EINVAL;
+		goto bind_unlock_exit;
+	}
+
+	if (dev) {
+		if (dev->flags&IFF_UP) {
+			chan=dev->priv;
+			sk->sk_state = chan->state;
+
+			if (wp->num == htons(X25_PROT) && 
+			    sk->sk_state != WANSOCK_DISCONNECTED && 
+			    sk->sk_state != WANSOCK_CONNECTING) {
+				DBG_PRINTK(KERN_INFO 
+					"wansock: Binding to Device not DISCONNECTED %i\n",
+						sk->sk_state);
+				release_device(dev);
+				err = -EAGAIN;
+				goto bind_unlock_exit;
+			}
+
+			wanpipe_link_driver(dev,sk);
+			sk->sk_bound_dev_if = dev->ifindex;
+
+			/* X25 Specific option */
+			if (wp->num == htons(X25_PROT))
+				wp_sk(sk)->svc = chan->svc;
+
+		} else {
+			sk->sk_err = ENETDOWN;
+			sk->sk_error_report(sk);
+			release_device(dev);
+			err = -EINVAL;
+		}
+	} else {
+		err = -ENODEV;
+	}
+bind_unlock_exit:
+	/* FIXME where is this lock */
+
+	return err;
+}
+
+/*============================================================
+ *  wanpipe_bind
+ *
+ *      BIND() System call, which is bound to the AF_WANPIPE
+ *      operations structure.  It checks for correct wanpipe
+ *      card name, and cross references interface names with
+ *      the card names.  Thus, interface name must belong to
+ *      the actual card.
+ *===========================================================*/
+
+
+static int wanpipe_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+	struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr;
+	struct sock *sk=sock->sk;
+	wanpipe_opt *wp = wp_sk(sk);
+	struct net_device *dev = NULL;
+	sdla_t *card=NULL;
+	char name[15];
+
+	/*
+	 *	Check legality
+	 */
+	 
+	if (addr_len < sizeof(struct wan_sockaddr_ll)){
+		printk(KERN_INFO "wansock: Address length error\n");
+		return -EINVAL;
+	}
+	if (sll->sll_family != AF_WANPIPE){
+		printk(KERN_INFO "wansock: Illegal family name specified.\n");
+		return -EINVAL;
+	}
+
+	card = wanpipe_find_card (sll->sll_card);
+	if (!card){
+		printk(KERN_INFO "wansock: Wanpipe card not found: %s\n",sll->sll_card);
+		return -ENODEV;
+	}else{
+		wp_sk(sk)->card = (void *)card;
+	}
+
+	if (!strcmp(sll->sll_device,"svc_listen")){
+
+		/* Bind a sock to a card structure for listening 
+		 */		
+		int err=0; 
+
+		/* This is x25 specific area if protocol doesn't
+                 * match, return error */
+		if (sll->sll_protocol != htons(X25_PROT))
+			return -EINVAL;
+
+		err= wanpipe_link_card (sk);
+		if (err < 0)
+			return err;
+
+		if (sll->sll_protocol)
+			wp->num = sll->sll_protocol;
+		sk->sk_state = WANSOCK_BIND_LISTEN;
+		return 0;
+
+	}else if (!strcmp(sll->sll_device,"svc_connect")){ 
+
+		/* This is x25 specific area if protocol doesn't
+                 * match, return error */
+		if (sll->sll_protocol != htons(X25_PROT))
+			return -EINVAL;
+
+		/* Find a free device 
+		 */
+		dev = wanpipe_find_free_dev(card);
+		if (dev == NULL){
+			DBG_PRINTK(KERN_INFO "wansock: No free network devices for card %s\n",
+				card->devname);
+			return -EINVAL;
+		}
+	}else{
+		/* Bind a socket to a interface name 
+                 * This is used by PVC mostly
+                 */
+		strlcpy(name,sll->sll_device,sizeof(name));
+		dev = dev_get_by_name(name);
+		if (dev == NULL){
+			printk(KERN_INFO "wansock: Failed to get Dev from name: %s,\n",
+					name);
+			return -ENODEV;
+		}
+
+		dev_put(dev);
+
+		if (check_dev(dev, card)){
+			printk(KERN_INFO "wansock: Device %s, doesn't belong to card %s\n",
+				dev->name, card->devname);
+			return -EINVAL;
+		}
+		if (get_atomic_device (dev))
+			return -EINVAL;
+	}
+
+	return wanpipe_do_bind(sk, dev, sll->sll_protocol ? : wp->num);
+}
+
+/*============================================================
+ * get_atomic_device
+ *	
+ *	Sets a bit atomically which indicates that 
+ *      the interface is taken. This avoids race conditions.
+ *===========================================================*/
+
+
+static inline int get_atomic_device(struct net_device *dev)
+{
+	wanpipe_common_t *chan = dev->priv;
+	if (!test_and_set_bit(0,(void *)&chan->rw_bind)){
+		return 0;
+	}
+	return 1;
+}
+
+/*============================================================
+ * check_dev
+ *	
+ *  	Check that device name belongs to a particular card.
+ *===========================================================*/
+
+static int check_dev(struct net_device *dev, sdla_t *card)
+{
+	struct net_device* tmp_dev;
+
+	for (tmp_dev = card->wandev.dev; tmp_dev;
+	     tmp_dev = *((struct net_device **)tmp_dev->priv)) {
+		if (tmp_dev->ifindex == dev->ifindex){ 
+			return 0;	
+		}
+	}
+	return 1;
+}
+
+/*============================================================
+ *  wanpipe_find_free_dev
+ *	
+ *	Find a free network interface. If found set atomic
+ *      bit indicating that the interface is taken.
+ *      X25API Specific.
+ *===========================================================*/
+
+struct net_device *wanpipe_find_free_dev(sdla_t *card)
+{
+	struct net_device* dev;
+	volatile wanpipe_common_t *chan;
+
+	if (test_and_set_bit(0,&find_free_critical)){
+		printk(KERN_INFO "CRITICAL in Find Free\n");
+	}	
+
+	for (dev = card->wandev.dev; dev;
+	     dev = *((struct net_device **)dev->priv)) {
+		chan = dev->priv;
+		if (!chan) 
+			continue;
+		if (chan->usedby == API && chan->svc){
+			if (!get_atomic_device (dev)){
+				if (chan->state != WANSOCK_DISCONNECTED){
+					release_device(dev);
+				}else{
+					clear_bit(0,&find_free_critical);
+					return dev;
+				}
+			}
+		}
+	}
+	clear_bit(0,&find_free_critical);
+	return NULL;
+}
+
+/*============================================================
+ *  wanpipe_create
+ *	
+ * 	SOCKET() System call.  It allocates a sock structure
+ *      and adds the socket to the wanpipe_sk_list. 
+ *      Crates AF_WANPIPE socket.
+ *===========================================================*/
+
+static int wanpipe_create(struct socket *sock, int protocol)
+{
+	struct sock *sk;
+	
+	//FIXME: This checks for root user, SECURITY ?
+	//if (!capable(CAP_NET_RAW))
+	//	return -EPERM;
+
+	if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
+		return -ESOCKTNOSUPPORT;
+
+	sock->state = SS_UNCONNECTED;
+
+	if ((sk = wanpipe_alloc_socket()) == NULL)
+		return -ENOBUFS;
+
+	sk->sk_reuse = 1;
+	sock->ops = &wanpipe_ops;
+	sock_init_data(sock,sk);
+
+	sock_reset_flag(sk, SOCK_ZAPPED);
+	sk->sk_family	    = PF_WANPIPE;
+	wp_sk(sk)->num	    = protocol;
+	sk->sk_state	    = WANSOCK_DISCONNECTED;
+	sk->sk_ack_backlog  = 0;
+	sk->sk_bound_dev_if = 0;
+
+	atomic_inc(&wanpipe_socks_nr);
+	
+	/* We must disable interrupts because the ISR
+	 * can also change the list */
+	set_bit(1,&wanpipe_tx_critical);
+	write_lock(&wanpipe_sklist_lock);
+	sk_add_node(sk, &wanpipe_sklist);
+	write_unlock(&wanpipe_sklist_lock);
+	clear_bit(1,&wanpipe_tx_critical);
+
+	return(0);
+}
+
+
+/*============================================================
+ *  wanpipe_recvmsg
+ *	
+ *	Pull a packet from our receive queue and hand it 
+ *      to the user. If necessary we block.
+ *===========================================================*/
+
+static int wanpipe_recvmsg(struct kiocb *iocb, struct socket *sock,
+			   struct msghdr *msg, int len, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct sk_buff *skb;
+	int copied, err=-ENOBUFS;
+
+
+	/*
+	 *	If the address length field is there to be filled in, we fill
+	 *	it in now.
+	 */
+
+	msg->msg_namelen = sizeof(struct wan_sockaddr_ll);
+
+	/*
+	 *	Call the generic datagram receiver. This handles all sorts
+	 *	of horrible races and re-entrancy so we can forget about it
+	 *	in the protocol layers.
+	 *
+	 *	Now it will return ENETDOWN, if device have just gone down,
+	 *	but then it will block.
+	 */
+
+	if (flags & MSG_OOB){	
+		skb = skb_dequeue(&sk->sk_error_queue);
+	}else{
+		skb=skb_recv_datagram(sk,flags,1,&err);
+	}
+	/*
+	 *	An error occurred so return it. Because skb_recv_datagram() 
+	 *	handles the blocking we don't see and worry about blocking
+	 *	retries.
+	 */
+
+	if(skb==NULL)
+		goto out;
+
+	/*
+	 *	You lose any data beyond the buffer you gave. If it worries a
+	 *	user program they can ask the device for its MTU anyway.
+	 */
+
+	copied = skb->len;
+	if (copied > len)
+	{
+		copied=len;
+		msg->msg_flags|=MSG_TRUNC;
+	}
+
+	wanpipe_wakeup_driver(sk);
+
+	/* We can't use skb_copy_datagram here */
+	err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
+	if (err)
+		goto out_free;
+	
+	sock_recv_timestamp(msg, sk, skb);
+	
+	if (msg->msg_name)
+		memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
+
+	/*
+	 *	Free or return the buffer as appropriate. Again this
+	 *	hides all the races and re-entrancy issues from us.
+	 */
+	err = (flags&MSG_TRUNC) ? skb->len : copied;
+
+out_free:
+	skb_free_datagram(sk, skb);
+out:
+	return err;
+}
+
+
+/*============================================================
+ *  wanpipe_wakeup_driver
+ *	
+ * 	If socket receive buffer is full and driver cannot
+ *      pass data up the sock, it sets a packet_block flag.
+ *      This function check that flag and if sock receive 
+ *      queue has room it kicks the driver BH handler. 
+ *
+ * 	This way, driver doesn't have to poll the sock 
+ *      receive queue.
+ *===========================================================*/
+
+static void wanpipe_wakeup_driver(struct sock *sk)
+{
+	struct net_device *dev = NULL;
+	wanpipe_common_t *chan=NULL;
+
+	dev = dev_get_by_index(sk->sk_bound_dev_if);
+	if (!dev)
+		return;
+
+	dev_put(dev);
+
+	if ((chan = dev->priv) == NULL)
+		return;
+	
+	if (atomic_read(&chan->receive_block)){  
+		if (atomic_read(&sk->sk_rmem_alloc) <
+		    ((unsigned)sk->sk_rcvbuf * 0.9)) {
+			printk(KERN_INFO "wansock: Queuing task for wanpipe\n");
+			atomic_set(&chan->receive_block,0);
+			wanpipe_queue_tq(&chan->wanpipe_task);
+			wanpipe_mark_bh();
+		}
+	}	
+}	
+
+/*============================================================
+ *  wanpipe_getname
+ *	
+ * 	I don't know what to do with this yet. 
+ *      User can use this function to get sock address
+ *      information. Not very useful for Sangoma's purposes.
+ *===========================================================*/
+
+
+static int wanpipe_getname(struct socket *sock, struct sockaddr *uaddr,
+			  int *uaddr_len, int peer)
+{
+	struct net_device *dev;
+	struct sock *sk = sock->sk;
+	struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr;
+
+	sll->sll_family = AF_WANPIPE;
+	sll->sll_ifindex = sk->sk_bound_dev_if;
+	sll->sll_protocol = wp_sk(sk)->num;
+	dev = dev_get_by_index(sk->sk_bound_dev_if);
+	if (dev) {
+		sll->sll_hatype = dev->type;
+		sll->sll_halen = dev->addr_len;
+		memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
+	} else {
+		sll->sll_hatype = 0;	/* Bad: we have no ARPHRD_UNSPEC */
+		sll->sll_halen = 0;
+	}
+	*uaddr_len = sizeof(*sll);
+	
+	dev_put(dev);
+	
+	return 0;
+}
+
+/*============================================================
+ *  wanpipe_notifier
+ *	
+ *	If driver turns off network interface, this function
+ *      will be envoked. Currently I treate it as a 
+ *      call disconnect. More thought should go into this
+ *      function.
+ *
+ * FIXME: More thought should go into this function.
+ *
+ *===========================================================*/
+
+static int wanpipe_notifier(struct notifier_block *this, unsigned long msg, void *data)
+{
+	struct sock *sk;
+	hlist_node *node;
+	struct net_device *dev = (struct net_device *)data;
+
+	sk_for_each(sk, node, &wanpipe_sklist) {
+		struct wanpipe_opt *po = wp_sk(sk);
+
+		if (!po)
+			continue;
+		if (dev == NULL)
+			continue;
+		
+		switch (msg) {
+		case NETDEV_DOWN:
+		case NETDEV_UNREGISTER:
+			if (dev->ifindex == sk->sk_bound_dev_if) {
+				printk(KERN_INFO "wansock: Device down %s\n",dev->name);
+				if (sock_flag(sk, SOCK_ZAPPED)) {
+					wanpipe_unlink_driver(sk);
+					sk->sk_err = ENETDOWN;
+					sk->sk_error_report(sk);
+				}
+
+				if (msg == NETDEV_UNREGISTER) {
+					printk(KERN_INFO "wansock: Unregistering Device: %s\n",
+						 	  dev->name);
+					wanpipe_unlink_driver(sk);
+					sk->sk_bound_dev_if = 0;
+				}
+			}
+			break;
+		case NETDEV_UP:
+			if (dev->ifindex == sk->sk_bound_dev_if &&
+			    po->num && !sock_flag(sk, SOCK_ZAPPED)) {
+				printk(KERN_INFO "wansock: Registering Device: %s\n",
+						dev->name);
+				wanpipe_link_driver(dev,sk);
+			}
+			break;
+		}
+	}
+	return NOTIFY_DONE;
+}
+
+/*============================================================
+ *  wanpipe_ioctl
+ *	
+ * 	Execute a user commands, and set socket options.
+ *
+ * FIXME: More thought should go into this function.
+ *
+ *===========================================================*/
+
+static int wanpipe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	struct sock *sk = sock->sk;
+	int err;
+
+	switch(cmd) 
+	{
+		case SIOCGSTAMP:
+			return sock_get_timestamp(sk, (struct timeval __user *)arg);
+
+		case SIOC_WANPIPE_CHECK_TX:
+
+			return atomic_read(&sk->sk_wmem_alloc);
+
+		case SIOC_WANPIPE_SOCK_STATE:
+
+			if (sk->sk_state == WANSOCK_CONNECTED)
+				return 0;
+			
+			return 1;
+
+
+		case SIOC_WANPIPE_GET_CALL_DATA:
+
+			return get_ioctl_cmd (sk,(void*)arg);
+
+		case SIOC_WANPIPE_SET_CALL_DATA:
+
+			return set_ioctl_cmd (sk,(void*)arg);
+
+		case SIOC_WANPIPE_ACCEPT_CALL:
+		case SIOC_WANPIPE_CLEAR_CALL:
+		case SIOC_WANPIPE_RESET_CALL:
+
+			if ((err=set_ioctl_cmd(sk,(void*)arg)) < 0)
+				return err;
+
+			err=wanpipe_exec_cmd(sk,cmd,0);
+			get_ioctl_cmd(sk,(void*)arg);
+			return err;
+
+		case SIOC_WANPIPE_DEBUG:
+
+			return wanpipe_debug(sk,(void*)arg);
+	
+		case SIOC_WANPIPE_SET_NONBLOCK:
+
+			if (sk->sk_state != WANSOCK_DISCONNECTED)
+				return -EINVAL;
+
+			sock->file->f_flags |= O_NONBLOCK;
+			return 0;
+	
+#ifdef CONFIG_INET
+		case SIOCADDRT:
+		case SIOCDELRT:
+		case SIOCDARP:
+		case SIOCGARP:
+		case SIOCSARP:
+		case SIOCDRARP:
+		case SIOCGRARP:
+		case SIOCSRARP:
+		case SIOCGIFADDR:
+		case SIOCSIFADDR:
+		case SIOCGIFBRDADDR:
+		case SIOCSIFBRDADDR:
+		case SIOCGIFNETMASK:
+		case SIOCSIFNETMASK:
+		case SIOCGIFDSTADDR:
+		case SIOCSIFDSTADDR:
+		case SIOCSIFFLAGS:
+			return inet_dgram_ops.ioctl(sock, cmd, arg);
+#endif
+
+		default:
+			return dev_ioctl(cmd,(void __user *) arg);
+	}
+	/*NOTREACHED*/
+}
+
+/*============================================================
+ *  wanpipe_debug
+ *	
+ *	This function will pass up information about all
+ *      active sockets.
+ *
+ * FIXME: More thought should go into this function.
+ *
+ *===========================================================*/
+
+static int wanpipe_debug (struct sock *origsk, void *arg)
+{
+	struct sock *sk;
+	struct hlist_node *node;
+	struct net_device *dev = NULL;
+	wanpipe_common_t *chan=NULL;
+	int cnt=0, err=0;
+	wan_debug_t *dbg_data = (wan_debug_t *)arg;
+
+	sk_for_each(sk, node, &wanpipe_sklist) {
+		wanpipe_opt *wp = wp_sk(sk);
+
+		if (sk == origsk){
+			continue;
+		}
+
+		if ((err=put_user(1, &dbg_data->debug[cnt].free)))
+			return err;
+		if ((err = put_user(sk->sk_state,
+				    &dbg_data->debug[cnt].state_sk)))
+			return err;
+		if ((err = put_user(sk->sk_rcvbuf,
+				    &dbg_data->debug[cnt].rcvbuf)))
+			return err;
+		if ((err = put_user(atomic_read(&sk->sk_rmem_alloc),
+				    &dbg_data->debug[cnt].rmem)))
+			return err;
+		if ((err = put_user(atomic_read(&sk->sk_wmem_alloc),
+				    &dbg_data->debug[cnt].wmem)))
+			return err;
+		if ((err = put_user(sk->sk_sndbuf,
+				    &dbg_data->debug[cnt].sndbuf)))
+			return err;
+		if ((err=put_user(sk_count, &dbg_data->debug[cnt].sk_count)))
+			return err;
+		if ((err=put_user(wp->poll_cnt, &dbg_data->debug[cnt].poll_cnt)))
+			return err;
+		if ((err = put_user(sk->sk_bound_dev_if,
+				    &dbg_data->debug[cnt].bound)))
+			return err;
+
+		if (sk->sk_bound_dev_if) {
+			dev = dev_get_by_index(sk->sk_bound_dev_if);
+			if (!dev)	
+				continue;
+
+			chan=dev->priv;
+			dev_put(dev);
+	
+			if ((err=put_user(chan->state, &dbg_data->debug[cnt].d_state)))
+				return err;
+			if ((err=put_user(chan->svc, &dbg_data->debug[cnt].svc)))
+				return err;
+
+			if ((err=put_user(atomic_read(&chan->command), 
+						&dbg_data->debug[cnt].command)))
+				return err;
+
+
+			if (wp){
+				sdla_t *card = (sdla_t*)wp->card;			
+	
+				if (card){
+					if ((err=put_user(atomic_read(&card->u.x.command_busy), 
+								&dbg_data->debug[cnt].cmd_busy)))
+						return err;
+				}
+
+				if ((err=put_user(wp->lcn, 
+						  &dbg_data->debug[cnt].lcn)))
+					return err;
+				
+				if (wp->mbox) {
+					if ((err=put_user(1, &dbg_data->debug[cnt].mbox)))
+						return err;
+				}
+			}
+
+			if ((err=put_user(atomic_read(&chan->receive_block), 
+								&dbg_data->debug[cnt].rblock)))
+				return err;
+
+			if (copy_to_user(dbg_data->debug[cnt].name, dev->name, strlen(dev->name)))
+				return -EFAULT;
+		}
+	
+		if (++cnt == MAX_NUM_DEBUG)
+			break;
+	}
+	return 0;
+}
+
+/*============================================================
+ *  get_ioctl_cmd
+ *	
+ *	Pass up the contents of socket MBOX to the user.
+ *===========================================================*/
+
+static int get_ioctl_cmd (struct sock *sk, void *arg)
+{
+	x25api_t *usr_data = (x25api_t *)arg;
+	mbox_cmd_t *mbox_ptr;
+	int err;
+
+	if (usr_data == NULL)
+		return -EINVAL;
+
+	if (!wp_sk(sk)->mbox) {
+		return -EINVAL;
+	}
+
+	mbox_ptr = (mbox_cmd_t *)wp_sk(sk)->mbox;
+
+	if ((err=put_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm)))
+		return err;
+	if ((err=put_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause)))
+		return err;
+	if ((err=put_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn)))
+		return err;
+	if ((err=put_user(mbox_ptr->cmd.length, &usr_data->hdr.length)))
+		return err;
+	if ((err=put_user(mbox_ptr->cmd.result, &usr_data->hdr.result)))
+		return err;
+	if ((err=put_user(mbox_ptr->cmd.lcn, &usr_data->hdr.lcn)))
+		return err;	
+
+	if (mbox_ptr->cmd.length > 0){
+		if (mbox_ptr->cmd.length > X25_MAX_DATA)
+			return -EINVAL;
+
+		if (copy_to_user(usr_data->data, mbox_ptr->data, mbox_ptr->cmd.length)){
+			printk(KERN_INFO "wansock: Copy failed !!!\n");
+			return -EFAULT;
+		}
+	}
+	return 0;
+} 
+
+/*============================================================
+ *  set_ioctl_cmd
+ *	
+ *	Before command can be execute, socket MBOX must
+ *      be created, and initialized with user data.	
+ *===========================================================*/
+
+static int set_ioctl_cmd (struct sock *sk, void *arg)
+{
+	x25api_t *usr_data = (x25api_t *)arg;
+	mbox_cmd_t *mbox_ptr;
+	int err;
+
+	if (!wp_sk(sk)->mbox) {
+		void *mbox_ptr;
+		struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
+		if (!dev)
+			return -ENODEV;
+
+		dev_put(dev);
+		
+		if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL)
+			return -ENOMEM;
+
+		memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
+		wp_sk(sk)->mbox = mbox_ptr;
+
+		wanpipe_link_driver(dev,sk);
+	}
+
+	mbox_ptr = (mbox_cmd_t*)wp_sk(sk)->mbox;
+	memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
+
+	if (usr_data == NULL){
+		return 0;
+	}
+	if ((err=get_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm)))
+		return err;
+	if ((err=get_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause)))
+		return err;
+	if ((err=get_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn)))
+		return err;
+	if ((err=get_user(mbox_ptr->cmd.length, &usr_data->hdr.length)))
+		return err;
+	if ((err=get_user(mbox_ptr->cmd.result, &usr_data->hdr.result)))
+		return err;
+
+	if (mbox_ptr->cmd.length > 0){
+		if (mbox_ptr->cmd.length > X25_MAX_DATA)
+			return -EINVAL;
+
+		if (copy_from_user(mbox_ptr->data, usr_data->data, mbox_ptr->cmd.length)){
+			printk(KERN_INFO "Copy failed\n");
+			return -EFAULT;
+		}
+	}
+	return 0;
+}
+
+
+/*======================================================================
+ * wanpipe_poll
+ *
+ *	Datagram poll: Again totally generic. This also handles
+ *	sequenced packet sockets providing the socket receive queue
+ *	is only ever holding data ready to receive.
+ *
+ *	Note: when you _don't_ use this routine for this protocol,
+ *	and you use a different write policy from sock_writeable()
+ *	then please supply your own write_space callback.
+ *=====================================================================*/
+
+unsigned int wanpipe_poll(struct file * file, struct socket *sock, poll_table *wait)
+{
+	struct sock *sk = sock->sk;
+	unsigned int mask;
+
+	++wp_sk(sk)->poll_cnt;
+
+	poll_wait(file, sk->sk_sleep, wait);
+	mask = 0;
+
+	/* exceptional events? */
+	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) {
+		mask |= POLLPRI;
+		return mask;
+	}
+	if (sk->sk_shutdown & RCV_SHUTDOWN)
+		mask |= POLLHUP;
+
+	/* readable? */
+	if (!skb_queue_empty(&sk->sk_receive_queue)) {
+		mask |= POLLIN | POLLRDNORM;
+	}
+
+	/* connection hasn't started yet */
+	if (sk->sk_state == WANSOCK_CONNECTING) {
+		return mask;
+	}
+
+	if (sk->sk_state == WANSOCK_DISCONNECTED) {
+		mask = POLLPRI;
+		return mask;
+	}
+
+	/* This check blocks the user process if there is   
+	 * a packet already queued in the socket write queue.
+         * This option is only for X25API protocol, for other
+         * protocol like chdlc enable streaming mode, 
+         * where multiple packets can be pending in the socket 
+         * transmit queue */
+
+	if (wp_sk(sk)->num == htons(X25_PROT)) {
+		if (atomic_read(&wp_sk(sk)->packet_sent))
+			return mask;
+	}
+
+	/* writable? */
+	if (sock_writeable(sk)){
+		mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
+	}else{
+		set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+	}
+		
+	return mask;
+}
+
+/*======================================================================
+ * wanpipe_listen
+ *
+ *	X25API Specific function. Set a socket into LISTENING  MODE.
+ *=====================================================================*/
+
+
+static int wanpipe_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = sock->sk;
+
+ 	/* This is x25 specific area if protocol doesn't
+         * match, return error */
+	if (wp_sk(sk)->num != htons(X25_PROT))
+		return -EINVAL;
+
+	if (sk->sk_state == WANSOCK_BIND_LISTEN) {
+
+		sk->sk_max_ack_backlog = backlog;
+		sk->sk_state           = WANSOCK_LISTEN;
+		return 0;
+	}else{
+		printk(KERN_INFO "wansock: Listening sock was not binded\n");
+	}
+
+	return -EINVAL;
+}
+
+/*======================================================================
+ * wanpipe_link_card
+ *
+ *	Connects the listening socket to the driver
+ *=====================================================================*/
+
+static int wanpipe_link_card (struct sock *sk)
+{
+	sdla_t *card = (sdla_t*)wp_sk(sk)->card;
+
+	if (!card)
+		return -ENOMEM;
+
+	if ((card->sk != NULL) || (card->func != NULL)){
+		printk(KERN_INFO "wansock: Listening queue is already established\n");
+		return -EINVAL;
+	}
+
+	card->sk=sk;
+	card->func=wanpipe_listen_rcv;
+	sock_set_flag(sk, SOCK_ZAPPED);
+ 
+	return 0;
+}
+
+/*======================================================================
+ * wanpipe_listen
+ *
+ *	X25API Specific function. Disconnect listening socket from
+ *      the driver.
+ *=====================================================================*/
+
+static void wanpipe_unlink_card (struct sock *sk)
+{
+	sdla_t *card = (sdla_t*)wp_sk(sk)->card; 
+
+	if (card){
+		card->sk=NULL;
+		card->func=NULL;
+	}
+}
+
+/*======================================================================
+ * wanpipe_exec_cmd
+ *
+ *	Ioctl function calls this function to execute user command.
+ *      Connect() sytem call also calls this function to execute
+ *      place call.  This function blocks until command is executed.
+ *=====================================================================*/
+
+static int wanpipe_exec_cmd(struct sock *sk, int cmd, unsigned int flags)
+{
+	int err = -EINVAL;
+	wanpipe_opt *wp = wp_sk(sk);
+	mbox_cmd_t *mbox_ptr = (mbox_cmd_t*)wp->mbox;
+
+	if (!mbox_ptr){
+		printk(KERN_INFO "NO MBOX PTR !!!!!\n");
+		return -EINVAL;
+	}
+	
+	/* This is x25 specific area if protocol doesn't
+         * match, return error */
+	if (wp->num != htons(X25_PROT))
+		return -EINVAL;
+
+
+	switch (cmd){
+
+		case SIOC_WANPIPE_ACCEPT_CALL:
+
+			if (sk->sk_state != WANSOCK_CONNECTING) {
+				err = -EHOSTDOWN;
+				break;
+			}
+			
+			err = execute_command(sk,X25_ACCEPT_CALL,0);
+			if (err < 0)
+				break;
+
+			/* Update. Mar6 2000. 
+                         * Do not set the sock lcn number here, since
+                         * it is done in wanpipe_listen_rcv(). 
+                         */ 
+		 	if (sk->sk_state == WANSOCK_CONNECTED) {
+				wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;	
+				DBG_PRINTK(KERN_INFO "\nwansock: Accept OK %i\n",
+					wp->lcn);
+				err = 0;
+
+			}else{
+				DBG_PRINTK (KERN_INFO "\nwansock: Accept Failed %i\n",
+					wp->lcn);
+				wp->lcn = 0;
+				err = -ECONNREFUSED;
+			}
+			break;
+
+		case SIOC_WANPIPE_CLEAR_CALL:
+
+			if (sk->sk_state == WANSOCK_DISCONNECTED) {
+				err = -EINVAL;
+				break;
+			}
+
+
+			/* Check if data buffers are pending for transmission,
+                         * if so, check whether user wants to wait until data
+                         * is transmitted, or clear a call and drop packets */
+                          
+			if (atomic_read(&sk->sk_wmem_alloc) ||
+			    check_driver_busy(sk)) {
+			  	mbox_cmd_t *mbox = wp->mbox;
+				if (mbox->cmd.qdm & 0x80){
+					mbox->cmd.result = 0x35;
+					err = -EAGAIN;	
+					break;
+				}
+			}
+
+			sk->sk_state = WANSOCK_DISCONNECTING;
+
+			err = execute_command(sk,X25_CLEAR_CALL,0);
+			if (err < 0)
+				break;
+
+			err = -ECONNREFUSED;
+			if (sk->sk_state == WANSOCK_DISCONNECTED) {
+				DBG_PRINTK(KERN_INFO "\nwansock: CLEAR OK %i\n",
+					   wp->lcn);
+				wp->lcn = 0;
+				err = 0;
+			}
+			break;
+
+		case SIOC_WANPIPE_RESET_CALL:
+
+			if (sk->sk_state != WANSOCK_CONNECTED) {
+				err = -EINVAL;
+				break;
+			}
+
+
+			/* Check if data buffers are pending for transmission,
+                         * if so, check whether user wants to wait until data
+                         * is transmitted, or reset a call and drop packets */
+                          
+			if (atomic_read(&sk->sk_wmem_alloc) ||
+			    check_driver_busy(sk)) {
+			  	mbox_cmd_t *mbox = wp->mbox;
+				if (mbox->cmd.qdm & 0x80){
+					mbox->cmd.result = 0x35;
+					err = -EAGAIN;	
+					break;
+				}
+			}
+
+
+			err = execute_command(sk, X25_RESET,0);
+			if (err < 0)
+				break;
+
+			err = mbox_ptr->cmd.result;
+			break;
+
+
+		case X25_PLACE_CALL:
+
+			err=execute_command(sk,X25_PLACE_CALL,flags);
+			if (err < 0)
+				break;
+
+			if (sk->sk_state == WANSOCK_CONNECTED) {
+
+				wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;	
+
+				DBG_PRINTK(KERN_INFO "\nwansock: PLACE CALL OK %i\n",
+					wp->lcn);
+				err = 0;
+
+			} else if (sk->sk_state == WANSOCK_CONNECTING &&
+				   (flags & O_NONBLOCK)) {
+				wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;
+				DBG_PRINTK(KERN_INFO "\nwansock: Place Call OK: Waiting %i\n",
+					wp->lcn);
+
+				err = 0;
+
+			}else{
+				DBG_PRINTK(KERN_INFO "\nwansock: Place call Failed\n");
+				err = -ECONNREFUSED;
+			}
+
+			break;
+
+		default: 
+			return -EINVAL;
+	}
+
+	return err;
+}
+
+static int check_driver_busy (struct sock *sk)
+{
+	struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
+	wanpipe_common_t *chan;
+
+	if (!dev)
+		return 0;
+
+	dev_put(dev);
+
+	if ((chan=dev->priv) == NULL)
+		return 0;
+
+	return atomic_read(&chan->driver_busy);
+}
+
+
+/*======================================================================
+ * wanpipe_accept
+ *
+ *	ACCEPT() System call.	X25API Specific function. 
+ *	For each incoming call, create a new socket and 
+ *      return it to the user.	
+ *=====================================================================*/
+
+static int wanpipe_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+	struct sock *sk;
+	struct sock *newsk;
+	struct sk_buff *skb;
+	DECLARE_WAITQUEUE(wait, current);
+	int err=0;
+
+	if (newsock->sk != NULL){
+		wanpipe_kill_sock_accept(newsock->sk);	
+		newsock->sk=NULL;
+	}
+	
+	if ((sk = sock->sk) == NULL)
+		return -EINVAL;
+
+	if (sk->sk_type != SOCK_RAW)
+		return -EOPNOTSUPP;
+
+	if (sk->sk_state != WANSOCK_LISTEN)
+		return -EINVAL;
+
+	if (wp_sk(sk)->num != htons(X25_PROT))
+		return -EINVAL;
+
+	add_wait_queue(sk->sk_sleep,&wait);
+	current->state = TASK_INTERRUPTIBLE;
+	for (;;){
+		skb = skb_dequeue(&sk->sk_receive_queue);
+		if (skb){
+			err=0;
+			break;
+		}
+		if (signal_pending(current)) {
+			err = -ERESTARTSYS;
+			break;
+		}
+		schedule();
+	}
+	current->state = TASK_RUNNING;
+	remove_wait_queue(sk->sk_sleep,&wait);
+	
+	if (err != 0)
+		return err;
+	
+	newsk = get_newsk_from_skb(skb);
+	if (!newsk){
+		return -EINVAL;
+	}
+
+	set_bit(1,&wanpipe_tx_critical);
+	write_lock(&wanpipe_sklist_lock);
+	sk_add_node(newsk, &wanpipe_sklist);
+	write_unlock(&wanpipe_sklist_lock);
+	clear_bit(1,&wanpipe_tx_critical);
+
+	newsk->sk_socket = newsock;
+	newsk->sk_sleep = &newsock->wait;
+
+	/* Now attach up the new socket */
+	sk->sk_ack_backlog--;
+	newsock->sk = newsk;
+	
+	kfree_skb(skb);
+
+	DBG_PRINTK(KERN_INFO "\nwansock: ACCEPT Got LCN %i\n",
+		   wp_sk(newsk)->lcn);
+	return 0;
+}
+
+/*======================================================================
+ *  get_newsk_from_skb
+ *
+ *	Accept() uses this function to get the address of the new
+ *      socket structure.
+ *=====================================================================*/
+
+struct sock * get_newsk_from_skb (struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	wanpipe_common_t *chan;	
+
+	if (!dev){
+		return NULL;
+	}
+		
+	if ((chan = dev->priv) == NULL){
+		return NULL;
+	}
+		
+	if (!chan->sk){
+		return NULL;
+	}
+	return (struct sock *)chan->sk;
+}
+
+/*======================================================================
+ *  wanpipe_connect
+ *
+ *  	CONNECT() System Call. X25API specific function
+ * 	Check the state of the sock, and execute PLACE_CALL command.
+ *      Connect can ether block or return without waiting for connection, 
+ *      if specified by user.
+ *=====================================================================*/
+
+static int wanpipe_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct wan_sockaddr_ll *addr = (struct wan_sockaddr_ll*)uaddr;
+	struct net_device *dev;
+	int err;
+
+	if (wp_sk(sk)->num != htons(X25_PROT))
+		return -EINVAL;
+
+	if (sk->sk_state == WANSOCK_CONNECTED)
+		return -EISCONN;	/* No reconnect on a seqpacket socket */
+
+	if (sk->sk_state != WAN_DISCONNECTED) {
+		printk(KERN_INFO "wansock: Trying to connect on channel NON DISCONNECT\n");
+		return -ECONNREFUSED;
+	}
+
+	sk->sk_state = WANSOCK_DISCONNECTED;	
+	sock->state  = SS_UNCONNECTED;
+
+	if (addr_len != sizeof(struct wan_sockaddr_ll))
+		return -EINVAL;
+
+	if (addr->sll_family != AF_WANPIPE)
+		return -EINVAL;
+
+	if ((dev = dev_get_by_index(sk->sk_bound_dev_if)) == NULL)
+		return -ENETUNREACH;
+
+	dev_put(dev);
+	
+	if (!sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
+		return -EINVAL;
+
+	sock->state   = SS_CONNECTING;
+	sk->sk_state  = WANSOCK_CONNECTING;
+
+	if (!wp_sk(sk)->mbox) {
+		if (wp_sk (sk)->svc)
+			return -EINVAL;
+		else {
+			int err;
+			if ((err=set_ioctl_cmd(sk,NULL)) < 0)
+				return err;
+		}
+	}
+
+	if ((err=wanpipe_exec_cmd(sk, X25_PLACE_CALL,flags)) != 0){
+		sock->state = SS_UNCONNECTED;
+		sk->sk_state = WANSOCK_CONNECTED;
+		return err;
+	}
+
+	if (sk->sk_state != WANSOCK_CONNECTED && (flags & O_NONBLOCK)) {
+		return 0;
+	}
+
+	if (sk->sk_state != WANSOCK_CONNECTED) {
+		sock->state = SS_UNCONNECTED;
+		return -ECONNREFUSED; 
+	}
+
+	sock->state = SS_CONNECTED;
+	return 0;
+}
+
+struct proto_ops wanpipe_ops = {
+	.family = 	PF_WANPIPE,
+	.owner =	THIS_MODULE,
+	.release = 	wanpipe_release,
+	.bind = 	wanpipe_bind,
+	.connect = 	wanpipe_connect,
+	.socketpair = 	sock_no_socketpair,
+	.accept = 	wanpipe_accept,
+	.getname = 	wanpipe_getname, 
+	.poll = 	wanpipe_poll,
+	.ioctl = 	wanpipe_ioctl,
+	.listen = 	wanpipe_listen, 
+	.shutdown = 	sock_no_shutdown,
+	.setsockopt = 	sock_no_setsockopt,
+	.getsockopt = 	sock_no_getsockopt,
+	.sendmsg = 	wanpipe_sendmsg,
+	.recvmsg = 	wanpipe_recvmsg
+};
+
+static struct net_proto_family wanpipe_family_ops = {
+	.family = PF_WANPIPE,
+	.create = wanpipe_create,
+	.owner	= THIS_MODULE,
+};
+
+struct notifier_block wanpipe_netdev_notifier = {
+	.notifier_call = wanpipe_notifier,
+};
+
+
+#ifdef MODULE
+void cleanup_module(void)
+{
+	printk(KERN_INFO "wansock: Cleaning up \n");
+	unregister_netdevice_notifier(&wanpipe_netdev_notifier);
+	sock_unregister(PF_WANPIPE);
+	proto_unregister(&wanpipe_proto);
+}
+
+int init_module(void)
+{
+	int rc;
+
+	printk(KERN_INFO "wansock: Registering Socket \n");
+
+	rc = proto_register(&wanpipe_proto, 0);
+	if (rc != 0)
+		goto out;
+
+	sock_register(&wanpipe_family_ops);
+	register_netdevice_notifier(&wanpipe_netdev_notifier);
+out:
+	return rc;
+}
+#endif
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_WANPIPE);