/*
   * 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.
   *
   * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
   * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net)
   * Copyright (C) Tomi Manninen OH2BNS (oh2bns@sral.fi)
   */

  #include <linux/capability.h>

  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/init.h>
  #include <linux/errno.h>
  #include <linux/types.h>
  #include <linux/socket.h>
  #include <linux/in.h>

  #include <linux/slab.h>

  #include <linux/kernel.h>
  #include <linux/sched.h>
  #include <linux/spinlock.h>
  #include <linux/timer.h>
  #include <linux/string.h>
  #include <linux/sockios.h>
  #include <linux/net.h>
  #include <linux/stat.h>

  #include <net/net_namespace.h>

  #include <net/ax25.h>
  #include <linux/inet.h>
  #include <linux/netdevice.h>
  #include <linux/if_arp.h>
  #include <linux/skbuff.h>
  #include <net/sock.h>
  #include <asm/system.h>
  #include <asm/uaccess.h>
  #include <linux/fcntl.h>
  #include <linux/termios.h>
  #include <linux/mm.h>
  #include <linux/interrupt.h>
  #include <linux/notifier.h>
  #include <net/rose.h>
  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>

  #include <net/tcp_states.h>

  #include <net/ip.h>
  #include <net/arp.h>
  
  static int rose_ndevs = 10;
  
  int sysctl_rose_restart_request_timeout = ROSE_DEFAULT_T0;
  int sysctl_rose_call_request_timeout    = ROSE_DEFAULT_T1;
  int sysctl_rose_reset_request_timeout   = ROSE_DEFAULT_T2;
  int sysctl_rose_clear_request_timeout   = ROSE_DEFAULT_T3;
  int sysctl_rose_no_activity_timeout     = ROSE_DEFAULT_IDLE;
  int sysctl_rose_ack_hold_back_timeout   = ROSE_DEFAULT_HB;
  int sysctl_rose_routing_control         = ROSE_DEFAULT_ROUTING;
  int sysctl_rose_link_fail_timeout       = ROSE_DEFAULT_FAIL_TIMEOUT;
  int sysctl_rose_maximum_vcs             = ROSE_DEFAULT_MAXVC;
  int sysctl_rose_window_size             = ROSE_DEFAULT_WINDOW_SIZE;
  
  static HLIST_HEAD(rose_list);
  static DEFINE_SPINLOCK(rose_list_lock);

  static const struct proto_ops rose_proto_ops;

  
  ax25_address rose_callsign;
  
  /*

   * ROSE network devices are virtual network devices encapsulating ROSE
   * frames into AX.25 which will be sent through an AX.25 device, so form a
   * special "super class" of normal net devices; split their locks off into a
   * separate class since they always nest.
   */
  static struct lock_class_key rose_netdev_xmit_lock_key;

  static struct lock_class_key rose_netdev_addr_lock_key;

  static void rose_set_lockdep_one(struct net_device *dev,
  				 struct netdev_queue *txq,
  				 void *_unused)

  {
  	lockdep_set_class(&txq->_xmit_lock, &rose_netdev_xmit_lock_key);
  }
  
  static void rose_set_lockdep_key(struct net_device *dev)
  {

  	lockdep_set_class(&dev->addr_list_lock, &rose_netdev_addr_lock_key);

  	netdev_for_each_tx_queue(dev, rose_set_lockdep_one, NULL);

  }

  /*

   *	Convert a ROSE address into text.
   */

  char *rose2asc(char *buf, const rose_address *addr)

  {

  	if (addr->rose_addr[0] == 0x00 && addr->rose_addr[1] == 0x00 &&
  	    addr->rose_addr[2] == 0x00 && addr->rose_addr[3] == 0x00 &&
  	    addr->rose_addr[4] == 0x00) {

  		strcpy(buf, "*");

  	} else {

  		sprintf(buf, "%02X%02X%02X%02X%02X", addr->rose_addr[0] & 0xFF,

  						addr->rose_addr[1] & 0xFF,
  						addr->rose_addr[2] & 0xFF,
  						addr->rose_addr[3] & 0xFF,
  						addr->rose_addr[4] & 0xFF);
  	}

  	return buf;

  }
  
  /*
   *	Compare two ROSE addresses, 0 == equal.
   */
  int rosecmp(rose_address *addr1, rose_address *addr2)
  {
  	int i;
  
  	for (i = 0; i < 5; i++)
  		if (addr1->rose_addr[i] != addr2->rose_addr[i])
  			return 1;
  
  	return 0;
  }
  
  /*
   *	Compare two ROSE addresses for only mask digits, 0 == equal.
   */
  int rosecmpm(rose_address *addr1, rose_address *addr2, unsigned short mask)
  {

  	unsigned int i, j;

  
  	if (mask > 10)
  		return 1;
  
  	for (i = 0; i < mask; i++) {
  		j = i / 2;
  
  		if ((i % 2) != 0) {
  			if ((addr1->rose_addr[j] & 0x0F) != (addr2->rose_addr[j] & 0x0F))
  				return 1;
  		} else {
  			if ((addr1->rose_addr[j] & 0xF0) != (addr2->rose_addr[j] & 0xF0))
  				return 1;
  		}
  	}
  
  	return 0;
  }
  
  /*
   *	Socket removal during an interrupt is now safe.
   */
  static void rose_remove_socket(struct sock *sk)
  {
  	spin_lock_bh(&rose_list_lock);
  	sk_del_node_init(sk);
  	spin_unlock_bh(&rose_list_lock);
  }
  
  /*
   *	Kill all bound sockets on a broken link layer connection to a
   *	particular neighbour.
   */
  void rose_kill_by_neigh(struct rose_neigh *neigh)
  {
  	struct sock *s;
  	struct hlist_node *node;
  
  	spin_lock_bh(&rose_list_lock);
  	sk_for_each(s, node, &rose_list) {
  		struct rose_sock *rose = rose_sk(s);
  
  		if (rose->neighbour == neigh) {
  			rose_disconnect(s, ENETUNREACH, ROSE_OUT_OF_ORDER, 0);
  			rose->neighbour->use--;
  			rose->neighbour = NULL;
  		}
  	}
  	spin_unlock_bh(&rose_list_lock);
  }
  
  /*
   *	Kill all bound sockets on a dropped device.
   */
  static void rose_kill_by_device(struct net_device *dev)
  {
  	struct sock *s;
  	struct hlist_node *node;
  
  	spin_lock_bh(&rose_list_lock);
  	sk_for_each(s, node, &rose_list) {
  		struct rose_sock *rose = rose_sk(s);
  
  		if (rose->device == dev) {
  			rose_disconnect(s, ENETUNREACH, ROSE_OUT_OF_ORDER, 0);
  			rose->neighbour->use--;
  			rose->device = NULL;
  		}
  	}
  	spin_unlock_bh(&rose_list_lock);
  }
  
  /*
   *	Handle device status changes.
   */
  static int rose_device_event(struct notifier_block *this, unsigned long event,
  	void *ptr)
  {
  	struct net_device *dev = (struct net_device *)ptr;

  	if (!net_eq(dev_net(dev), &init_net))

  		return NOTIFY_DONE;

  	if (event != NETDEV_DOWN)
  		return NOTIFY_DONE;
  
  	switch (dev->type) {
  	case ARPHRD_ROSE:
  		rose_kill_by_device(dev);
  		break;
  	case ARPHRD_AX25:
  		rose_link_device_down(dev);
  		rose_rt_device_down(dev);
  		break;
  	}
  
  	return NOTIFY_DONE;
  }
  
  /*
   *	Add a socket to the bound sockets list.
   */
  static void rose_insert_socket(struct sock *sk)
  {
  
  	spin_lock_bh(&rose_list_lock);
  	sk_add_node(sk, &rose_list);
  	spin_unlock_bh(&rose_list_lock);
  }
  
  /*
   *	Find a socket that wants to accept the Call Request we just
   *	received.
   */
  static struct sock *rose_find_listener(rose_address *addr, ax25_address *call)
  {
  	struct sock *s;
  	struct hlist_node *node;
  
  	spin_lock_bh(&rose_list_lock);
  	sk_for_each(s, node, &rose_list) {
  		struct rose_sock *rose = rose_sk(s);
  
  		if (!rosecmp(&rose->source_addr, addr) &&
  		    !ax25cmp(&rose->source_call, call) &&
  		    !rose->source_ndigis && s->sk_state == TCP_LISTEN)
  			goto found;
  	}
  
  	sk_for_each(s, node, &rose_list) {
  		struct rose_sock *rose = rose_sk(s);
  
  		if (!rosecmp(&rose->source_addr, addr) &&
  		    !ax25cmp(&rose->source_call, &null_ax25_address) &&
  		    s->sk_state == TCP_LISTEN)
  			goto found;
  	}
  	s = NULL;
  found:
  	spin_unlock_bh(&rose_list_lock);
  	return s;
  }
  
  /*
   *	Find a connected ROSE socket given my LCI and device.
   */
  struct sock *rose_find_socket(unsigned int lci, struct rose_neigh *neigh)
  {
  	struct sock *s;
  	struct hlist_node *node;
  
  	spin_lock_bh(&rose_list_lock);
  	sk_for_each(s, node, &rose_list) {
  		struct rose_sock *rose = rose_sk(s);
  
  		if (rose->lci == lci && rose->neighbour == neigh)
  			goto found;
  	}
  	s = NULL;
  found:
  	spin_unlock_bh(&rose_list_lock);
  	return s;
  }
  
  /*
   *	Find a unique LCI for a given device.
   */
  unsigned int rose_new_lci(struct rose_neigh *neigh)
  {
  	int lci;
  
  	if (neigh->dce_mode) {
  		for (lci = 1; lci <= sysctl_rose_maximum_vcs; lci++)
  			if (rose_find_socket(lci, neigh) == NULL && rose_route_free_lci(lci, neigh) == NULL)
  				return lci;
  	} else {
  		for (lci = sysctl_rose_maximum_vcs; lci > 0; lci--)
  			if (rose_find_socket(lci, neigh) == NULL && rose_route_free_lci(lci, neigh) == NULL)
  				return lci;
  	}
  
  	return 0;
  }
  
  /*
   *	Deferred destroy.
   */
  void rose_destroy_socket(struct sock *);
  
  /*
   *	Handler for deferred kills.
   */
  static void rose_destroy_timer(unsigned long data)
  {
  	rose_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 rose_destroy_socket(struct sock *sk)
  {
  	struct sk_buff *skb;
  
  	rose_remove_socket(sk);
  	rose_stop_heartbeat(sk);
  	rose_stop_idletimer(sk);
  	rose_stop_timer(sk);
  
  	rose_clear_queues(sk);		/* Flush the queues */
  
  	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
  		if (skb->sk != sk) {	/* A pending connection */
  			/* Queue the unaccepted socket for death */
  			sock_set_flag(skb->sk, SOCK_DEAD);
  			rose_start_heartbeat(skb->sk);
  			rose_sk(skb->sk)->state = ROSE_STATE_0;
  		}
  
  		kfree_skb(skb);
  	}

  	if (sk_has_allocations(sk)) {

  		/* Defer: outstanding buffers */

  		setup_timer(&sk->sk_timer, rose_destroy_timer,
  				(unsigned long)sk);

  		sk->sk_timer.expires  = jiffies + 10 * HZ;

  		add_timer(&sk->sk_timer);
  	} else
  		sock_put(sk);
  }
  
  /*
   *	Handling for system calls applied via the various interfaces to a
   *	ROSE socket object.
   */
  
  static int rose_setsockopt(struct socket *sock, int level, int optname,

  	char __user *optval, unsigned int optlen)

  {
  	struct sock *sk = sock->sk;
  	struct rose_sock *rose = rose_sk(sk);
  	int opt;
  
  	if (level != SOL_ROSE)
  		return -ENOPROTOOPT;
  
  	if (optlen < sizeof(int))
  		return -EINVAL;
  
  	if (get_user(opt, (int __user *)optval))
  		return -EFAULT;
  
  	switch (optname) {
  	case ROSE_DEFER:
  		rose->defer = opt ? 1 : 0;
  		return 0;
  
  	case ROSE_T1:
  		if (opt < 1)
  			return -EINVAL;
  		rose->t1 = opt * HZ;
  		return 0;
  
  	case ROSE_T2:
  		if (opt < 1)
  			return -EINVAL;
  		rose->t2 = opt * HZ;
  		return 0;
  
  	case ROSE_T3:
  		if (opt < 1)
  			return -EINVAL;
  		rose->t3 = opt * HZ;
  		return 0;
  
  	case ROSE_HOLDBACK:
  		if (opt < 1)
  			return -EINVAL;
  		rose->hb = opt * HZ;
  		return 0;
  
  	case ROSE_IDLE:
  		if (opt < 0)
  			return -EINVAL;
  		rose->idle = opt * 60 * HZ;
  		return 0;
  
  	case ROSE_QBITINCL:
  		rose->qbitincl = opt ? 1 : 0;
  		return 0;
  
  	default:
  		return -ENOPROTOOPT;
  	}
  }
  
  static int rose_getsockopt(struct socket *sock, int level, int optname,
  	char __user *optval, int __user *optlen)
  {
  	struct sock *sk = sock->sk;
  	struct rose_sock *rose = rose_sk(sk);
  	int val = 0;
  	int len;
  
  	if (level != SOL_ROSE)
  		return -ENOPROTOOPT;
  
  	if (get_user(len, optlen))
  		return -EFAULT;
  
  	if (len < 0)
  		return -EINVAL;
  
  	switch (optname) {
  	case ROSE_DEFER:
  		val = rose->defer;
  		break;
  
  	case ROSE_T1:
  		val = rose->t1 / HZ;
  		break;
  
  	case ROSE_T2:
  		val = rose->t2 / HZ;
  		break;
  
  	case ROSE_T3:
  		val = rose->t3 / HZ;
  		break;
  
  	case ROSE_HOLDBACK:
  		val = rose->hb / HZ;
  		break;
  
  	case ROSE_IDLE:
  		val = rose->idle / (60 * HZ);
  		break;
  
  	case ROSE_QBITINCL:
  		val = rose->qbitincl;
  		break;
  
  	default:
  		return -ENOPROTOOPT;
  	}
  
  	len = min_t(unsigned int, len, sizeof(int));
  
  	if (put_user(len, optlen))
  		return -EFAULT;
  
  	return copy_to_user(optval, &val, len) ? -EFAULT : 0;
  }
  
  static int rose_listen(struct socket *sock, int backlog)
  {
  	struct sock *sk = sock->sk;
  
  	if (sk->sk_state != TCP_LISTEN) {
  		struct rose_sock *rose = rose_sk(sk);
  
  		rose->dest_ndigis = 0;
  		memset(&rose->dest_addr, 0, ROSE_ADDR_LEN);
  		memset(&rose->dest_call, 0, AX25_ADDR_LEN);
  		memset(rose->dest_digis, 0, AX25_ADDR_LEN * ROSE_MAX_DIGIS);
  		sk->sk_max_ack_backlog = backlog;
  		sk->sk_state           = TCP_LISTEN;
  		return 0;
  	}
  
  	return -EOPNOTSUPP;
  }
  
  static struct proto rose_proto = {
  	.name	  = "ROSE",
  	.owner	  = THIS_MODULE,
  	.obj_size = sizeof(struct rose_sock),
  };

  static int rose_create(struct net *net, struct socket *sock, int protocol,
  		       int kern)

  {
  	struct sock *sk;
  	struct rose_sock *rose;

  	if (!net_eq(net, &init_net))

  		return -EAFNOSUPPORT;

  	if (sock->type != SOCK_SEQPACKET || protocol != 0)
  		return -ESOCKTNOSUPPORT;

  	sk = sk_alloc(net, PF_ROSE, GFP_ATOMIC, &rose_proto);
  	if (sk == NULL)

  		return -ENOMEM;
  
  	rose = rose_sk(sk);
  
  	sock_init_data(sock, sk);
  
  	skb_queue_head_init(&rose->ack_queue);
  #ifdef M_BIT
  	skb_queue_head_init(&rose->frag_queue);
  	rose->fraglen    = 0;
  #endif
  
  	sock->ops    = &rose_proto_ops;
  	sk->sk_protocol = protocol;
  
  	init_timer(&rose->timer);
  	init_timer(&rose->idletimer);

  	rose->t1   = msecs_to_jiffies(sysctl_rose_call_request_timeout);
  	rose->t2   = msecs_to_jiffies(sysctl_rose_reset_request_timeout);
  	rose->t3   = msecs_to_jiffies(sysctl_rose_clear_request_timeout);
  	rose->hb   = msecs_to_jiffies(sysctl_rose_ack_hold_back_timeout);
  	rose->idle = msecs_to_jiffies(sysctl_rose_no_activity_timeout);

  
  	rose->state = ROSE_STATE_0;
  
  	return 0;
  }
  
  static struct sock *rose_make_new(struct sock *osk)
  {
  	struct sock *sk;
  	struct rose_sock *rose, *orose;
  
  	if (osk->sk_type != SOCK_SEQPACKET)
  		return NULL;

  	sk = sk_alloc(sock_net(osk), PF_ROSE, GFP_ATOMIC, &rose_proto);

  	if (sk == NULL)

  		return NULL;
  
  	rose = rose_sk(sk);
  
  	sock_init_data(NULL, sk);
  
  	skb_queue_head_init(&rose->ack_queue);
  #ifdef M_BIT
  	skb_queue_head_init(&rose->frag_queue);
  	rose->fraglen  = 0;
  #endif
  
  	sk->sk_type     = osk->sk_type;

  	sk->sk_priority = osk->sk_priority;
  	sk->sk_protocol = osk->sk_protocol;
  	sk->sk_rcvbuf   = osk->sk_rcvbuf;
  	sk->sk_sndbuf   = osk->sk_sndbuf;
  	sk->sk_state    = TCP_ESTABLISHED;

  	sock_copy_flags(sk, osk);

  
  	init_timer(&rose->timer);
  	init_timer(&rose->idletimer);
  
  	orose		= rose_sk(osk);
  	rose->t1	= orose->t1;
  	rose->t2	= orose->t2;
  	rose->t3	= orose->t3;
  	rose->hb	= orose->hb;
  	rose->idle	= orose->idle;
  	rose->defer	= orose->defer;
  	rose->device	= orose->device;
  	rose->qbitincl	= orose->qbitincl;
  
  	return sk;
  }
  
  static int rose_release(struct socket *sock)
  {
  	struct sock *sk = sock->sk;
  	struct rose_sock *rose;
  
  	if (sk == NULL) return 0;

  	sock_hold(sk);
  	sock_orphan(sk);
  	lock_sock(sk);

  	rose = rose_sk(sk);
  
  	switch (rose->state) {
  	case ROSE_STATE_0:

  		release_sock(sk);

  		rose_disconnect(sk, 0, -1, -1);

  		lock_sock(sk);

  		rose_destroy_socket(sk);
  		break;
  
  	case ROSE_STATE_2:
  		rose->neighbour->use--;

  		release_sock(sk);

  		rose_disconnect(sk, 0, -1, -1);

  		lock_sock(sk);

  		rose_destroy_socket(sk);
  		break;
  
  	case ROSE_STATE_1:
  	case ROSE_STATE_3:
  	case ROSE_STATE_4:
  	case ROSE_STATE_5:
  		rose_clear_queues(sk);
  		rose_stop_idletimer(sk);
  		rose_write_internal(sk, ROSE_CLEAR_REQUEST);
  		rose_start_t3timer(sk);
  		rose->state  = ROSE_STATE_2;
  		sk->sk_state    = TCP_CLOSE;
  		sk->sk_shutdown |= SEND_SHUTDOWN;
  		sk->sk_state_change(sk);
  		sock_set_flag(sk, SOCK_DEAD);
  		sock_set_flag(sk, SOCK_DESTROY);
  		break;
  
  	default:
  		break;
  	}
  
  	sock->sk = NULL;

  	release_sock(sk);
  	sock_put(sk);

  
  	return 0;
  }
  
  static int rose_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
  {
  	struct sock *sk = sock->sk;
  	struct rose_sock *rose = rose_sk(sk);
  	struct sockaddr_rose *addr = (struct sockaddr_rose *)uaddr;
  	struct net_device *dev;

  	ax25_address *source;
  	ax25_uid_assoc *user;

  	int n;
  
  	if (!sock_flag(sk, SOCK_ZAPPED))
  		return -EINVAL;
  
  	if (addr_len != sizeof(struct sockaddr_rose) && addr_len != sizeof(struct full_sockaddr_rose))
  		return -EINVAL;
  
  	if (addr->srose_family != AF_ROSE)
  		return -EINVAL;
  
  	if (addr_len == sizeof(struct sockaddr_rose) && addr->srose_ndigis > 1)
  		return -EINVAL;

  	if ((unsigned int) addr->srose_ndigis > ROSE_MAX_DIGIS)

  		return -EINVAL;

  	if ((dev = rose_dev_get(&addr->srose_addr)) == NULL)

  		return -EADDRNOTAVAIL;

  
  	source = &addr->srose_call;

  	user = ax25_findbyuid(current_euid());

  	if (user) {
  		rose->source_call = user->call;
  		ax25_uid_put(user);
  	} else {

  		if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE))
  			return -EACCES;

  		rose->source_call   = *source;

  	}
  
  	rose->source_addr   = addr->srose_addr;

  	rose->device        = dev;
  	rose->source_ndigis = addr->srose_ndigis;
  
  	if (addr_len == sizeof(struct full_sockaddr_rose)) {
  		struct full_sockaddr_rose *full_addr = (struct full_sockaddr_rose *)uaddr;
  		for (n = 0 ; n < addr->srose_ndigis ; n++)
  			rose->source_digis[n] = full_addr->srose_digis[n];
  	} else {
  		if (rose->source_ndigis == 1) {
  			rose->source_digis[0] = addr->srose_digi;
  		}
  	}
  
  	rose_insert_socket(sk);
  
  	sock_reset_flag(sk, SOCK_ZAPPED);

  	return 0;
  }
  
  static int rose_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
  {
  	struct sock *sk = sock->sk;
  	struct rose_sock *rose = rose_sk(sk);
  	struct sockaddr_rose *addr = (struct sockaddr_rose *)uaddr;
  	unsigned char cause, diagnostic;

  	struct net_device *dev;

  	ax25_uid_assoc *user;

  	int n, err = 0;

  
  	if (addr_len != sizeof(struct sockaddr_rose) && addr_len != sizeof(struct full_sockaddr_rose))
  		return -EINVAL;
  
  	if (addr->srose_family != AF_ROSE)
  		return -EINVAL;
  
  	if (addr_len == sizeof(struct sockaddr_rose) && addr->srose_ndigis > 1)
  		return -EINVAL;

  	if ((unsigned int) addr->srose_ndigis > ROSE_MAX_DIGIS)

  		return -EINVAL;
  
  	/* Source + Destination digis should not exceed ROSE_MAX_DIGIS */
  	if ((rose->source_ndigis + addr->srose_ndigis) > ROSE_MAX_DIGIS)
  		return -EINVAL;

  	lock_sock(sk);
  
  	if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
  		/* Connect completed during a ERESTARTSYS event */
  		sock->state = SS_CONNECTED;
  		goto out_release;
  	}
  
  	if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
  		sock->state = SS_UNCONNECTED;
  		err = -ECONNREFUSED;
  		goto out_release;
  	}
  
  	if (sk->sk_state == TCP_ESTABLISHED) {
  		/* No reconnect on a seqpacket socket */
  		err = -EISCONN;
  		goto out_release;
  	}
  
  	sk->sk_state   = TCP_CLOSE;
  	sock->state = SS_UNCONNECTED;

  	rose->neighbour = rose_get_neigh(&addr->srose_addr, &cause,

  					 &diagnostic, 0);

  	if (!rose->neighbour) {
  		err = -ENETUNREACH;
  		goto out_release;
  	}

  
  	rose->lci = rose_new_lci(rose->neighbour);

  	if (!rose->lci) {
  		err = -ENETUNREACH;
  		goto out_release;
  	}

  
  	if (sock_flag(sk, SOCK_ZAPPED)) {	/* Must bind first - autobinding in this may or may not work */
  		sock_reset_flag(sk, SOCK_ZAPPED);

  		if ((dev = rose_dev_first()) == NULL) {
  			err = -ENETUNREACH;
  			goto out_release;
  		}

  		user = ax25_findbyuid(current_euid());

  		if (!user) {
  			err = -EINVAL;
  			goto out_release;
  		}

  
  		memcpy(&rose->source_addr, dev->dev_addr, ROSE_ADDR_LEN);

  		rose->source_call = user->call;

  		rose->device      = dev;

  		ax25_uid_put(user);

  
  		rose_insert_socket(sk);		/* Finish the bind */
  	}

  	rose->dest_addr   = addr->srose_addr;
  	rose->dest_call   = addr->srose_call;
  	rose->rand        = ((long)rose & 0xFFFF) + rose->lci;
  	rose->dest_ndigis = addr->srose_ndigis;
  
  	if (addr_len == sizeof(struct full_sockaddr_rose)) {
  		struct full_sockaddr_rose *full_addr = (struct full_sockaddr_rose *)uaddr;
  		for (n = 0 ; n < addr->srose_ndigis ; n++)
  			rose->dest_digis[n] = full_addr->srose_digis[n];
  	} else {
  		if (rose->dest_ndigis == 1) {
  			rose->dest_digis[0] = addr->srose_digi;
  		}
  	}
  
  	/* Move to connecting socket, start sending Connect Requests */
  	sock->state   = SS_CONNECTING;
  	sk->sk_state     = TCP_SYN_SENT;
  
  	rose->state = ROSE_STATE_1;
  
  	rose->neighbour->use++;
  
  	rose_write_internal(sk, ROSE_CALL_REQUEST);
  	rose_start_heartbeat(sk);
  	rose_start_t1timer(sk);
  
  	/* Now the loop */

  	if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
  		err = -EINPROGRESS;
  		goto out_release;
  	}

  
  	/*
  	 * A Connect Ack with Choke or timeout or failed routing will go to
  	 * closed.
  	 */
  	if (sk->sk_state == TCP_SYN_SENT) {

  		DEFINE_WAIT(wait);

  		for (;;) {

  			prepare_to_wait(sk_sleep(sk), &wait,

  					TASK_INTERRUPTIBLE);

  			if (sk->sk_state != TCP_SYN_SENT)
  				break;

  			if (!signal_pending(current)) {
  				release_sock(sk);

  				schedule();

  				lock_sock(sk);

  				continue;
  			}

  			err = -ERESTARTSYS;
  			break;

  		}

  		finish_wait(sk_sleep(sk), &wait);

  
  		if (err)
  			goto out_release;

  	}
  
  	if (sk->sk_state != TCP_ESTABLISHED) {
  		sock->state = SS_UNCONNECTED;

  		err = sock_error(sk);	/* Always set at this point */
  		goto out_release;

  	}
  
  	sock->state = SS_CONNECTED;

  out_release:
  	release_sock(sk);
  
  	return err;

  }
  
  static int rose_accept(struct socket *sock, struct socket *newsock, int flags)
  {

  	struct sk_buff *skb;
  	struct sock *newsk;

  	DEFINE_WAIT(wait);

  	struct sock *sk;
  	int err = 0;
  
  	if ((sk = sock->sk) == NULL)
  		return -EINVAL;
  
  	lock_sock(sk);
  	if (sk->sk_type != SOCK_SEQPACKET) {
  		err = -EOPNOTSUPP;

  		goto out_release;

  	}
  
  	if (sk->sk_state != TCP_LISTEN) {
  		err = -EINVAL;

  		goto out_release;

  	}
  
  	/*
  	 *	The write queue this time is holding sockets ready to use
  	 *	hooked into the SABM we saved
  	 */

  	for (;;) {

  		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);

  		skb = skb_dequeue(&sk->sk_receive_queue);
  		if (skb)
  			break;

  		if (flags & O_NONBLOCK) {

  			err = -EWOULDBLOCK;
  			break;

  		}

  		if (!signal_pending(current)) {
  			release_sock(sk);

  			schedule();
  			lock_sock(sk);
  			continue;
  		}

  		err = -ERESTARTSYS;
  		break;

  	}

  	finish_wait(sk_sleep(sk), &wait);

  	if (err)
  		goto out_release;

  
  	newsk = skb->sk;

  	sock_graft(newsk, newsock);

  
  	/* Now attach up the new socket */
  	skb->sk = NULL;
  	kfree_skb(skb);
  	sk->sk_ack_backlog--;

  out_release:

  	release_sock(sk);
  
  	return err;
  }
  
  static int rose_getname(struct socket *sock, struct sockaddr *uaddr,
  	int *uaddr_len, int peer)
  {
  	struct full_sockaddr_rose *srose = (struct full_sockaddr_rose *)uaddr;
  	struct sock *sk = sock->sk;
  	struct rose_sock *rose = rose_sk(sk);
  	int n;

  	memset(srose, 0, sizeof(*srose));

  	if (peer != 0) {
  		if (sk->sk_state != TCP_ESTABLISHED)
  			return -ENOTCONN;
  		srose->srose_family = AF_ROSE;
  		srose->srose_addr   = rose->dest_addr;
  		srose->srose_call   = rose->dest_call;
  		srose->srose_ndigis = rose->dest_ndigis;
  		for (n = 0; n < rose->dest_ndigis; n++)
  			srose->srose_digis[n] = rose->dest_digis[n];
  	} else {
  		srose->srose_family = AF_ROSE;
  		srose->srose_addr   = rose->source_addr;
  		srose->srose_call   = rose->source_call;
  		srose->srose_ndigis = rose->source_ndigis;
  		for (n = 0; n < rose->source_ndigis; n++)
  			srose->srose_digis[n] = rose->source_digis[n];
  	}
  
  	*uaddr_len = sizeof(struct full_sockaddr_rose);
  	return 0;
  }
  
  int rose_rx_call_request(struct sk_buff *skb, struct net_device *dev, struct rose_neigh *neigh, unsigned int lci)
  {
  	struct sock *sk;
  	struct sock *make;
  	struct rose_sock *make_rose;
  	struct rose_facilities_struct facilities;

  	int n;

  
  	skb->sk = NULL;		/* Initially we don't know who it's for */
  
  	/*
  	 *	skb->data points to the rose frame start
  	 */
  	memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));

  	if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF,
  				   skb->len - ROSE_CALL_REQ_FACILITIES_OFF,
  				   &facilities)) {

  		rose_transmit_clear_request(neigh, lci, ROSE_INVALID_FACILITY, 76);
  		return 0;
  	}
  
  	sk = rose_find_listener(&facilities.source_addr, &facilities.source_call);
  
  	/*
  	 * We can't accept the Call Request.
  	 */
  	if (sk == NULL || sk_acceptq_is_full(sk) ||
  	    (make = rose_make_new(sk)) == NULL) {
  		rose_transmit_clear_request(neigh, lci, ROSE_NETWORK_CONGESTION, 120);
  		return 0;
  	}
  
  	skb->sk     = make;
  	make->sk_state = TCP_ESTABLISHED;
  	make_rose = rose_sk(make);
  
  	make_rose->lci           = lci;
  	make_rose->dest_addr     = facilities.dest_addr;
  	make_rose->dest_call     = facilities.dest_call;
  	make_rose->dest_ndigis   = facilities.dest_ndigis;
  	for (n = 0 ; n < facilities.dest_ndigis ; n++)
  		make_rose->dest_digis[n] = facilities.dest_digis[n];
  	make_rose->source_addr   = facilities.source_addr;
  	make_rose->source_call   = facilities.source_call;
  	make_rose->source_ndigis = facilities.source_ndigis;
  	for (n = 0 ; n < facilities.source_ndigis ; n++)
  		make_rose->source_digis[n]= facilities.source_digis[n];
  	make_rose->neighbour     = neigh;
  	make_rose->device        = dev;
  	make_rose->facilities    = facilities;
  
  	make_rose->neighbour->use++;
  
  	if (rose_sk(sk)->defer) {
  		make_rose->state = ROSE_STATE_5;
  	} else {
  		rose_write_internal(make, ROSE_CALL_ACCEPTED);
  		make_rose->state = ROSE_STATE_3;
  		rose_start_idletimer(make);
  	}
  
  	make_rose->condition = 0x00;
  	make_rose->vs        = 0;
  	make_rose->va        = 0;
  	make_rose->vr        = 0;
  	make_rose->vl        = 0;
  	sk->sk_ack_backlog++;
  
  	rose_insert_socket(make);
  
  	skb_queue_head(&sk->sk_receive_queue, skb);
  
  	rose_start_heartbeat(make);
  
  	if (!sock_flag(sk, SOCK_DEAD))
  		sk->sk_data_ready(sk, skb->len);
  
  	return 1;
  }
  
  static int rose_sendmsg(struct kiocb *iocb, struct socket *sock,
  			struct msghdr *msg, size_t len)
  {
  	struct sock *sk = sock->sk;
  	struct rose_sock *rose = rose_sk(sk);
  	struct sockaddr_rose *usrose = (struct sockaddr_rose *)msg->msg_name;
  	int err;
  	struct full_sockaddr_rose srose;
  	struct sk_buff *skb;
  	unsigned char *asmptr;
  	int n, size, qbit = 0;
  
  	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
  		return -EINVAL;
  
  	if (sock_flag(sk, SOCK_ZAPPED))
  		return -EADDRNOTAVAIL;
  
  	if (sk->sk_shutdown & SEND_SHUTDOWN) {
  		send_sig(SIGPIPE, current, 0);
  		return -EPIPE;
  	}
  
  	if (rose->neighbour == NULL || rose->device == NULL)
  		return -ENETUNREACH;
  
  	if (usrose != NULL) {
  		if (msg->msg_namelen != sizeof(struct sockaddr_rose) && msg->msg_namelen != sizeof(struct full_sockaddr_rose))
  			return -EINVAL;
  		memset(&srose, 0, sizeof(struct full_sockaddr_rose));
  		memcpy(&srose, usrose, msg->msg_namelen);
  		if (rosecmp(&rose->dest_addr, &srose.srose_addr) != 0 ||
  		    ax25cmp(&rose->dest_call, &srose.srose_call) != 0)
  			return -EISCONN;
  		if (srose.srose_ndigis != rose->dest_ndigis)
  			return -EISCONN;
  		if (srose.srose_ndigis == rose->dest_ndigis) {
  			for (n = 0 ; n < srose.srose_ndigis ; n++)
  				if (ax25cmp(&rose->dest_digis[n],
  					    &srose.srose_digis[n]))
  					return -EISCONN;
  		}
  		if (srose.srose_family != AF_ROSE)
  			return -EINVAL;
  	} else {
  		if (sk->sk_state != TCP_ESTABLISHED)
  			return -ENOTCONN;
  
  		srose.srose_family = AF_ROSE;
  		srose.srose_addr   = rose->dest_addr;
  		srose.srose_call   = rose->dest_call;
  		srose.srose_ndigis = rose->dest_ndigis;
  		for (n = 0 ; n < rose->dest_ndigis ; n++)
  			srose.srose_digis[n] = rose->dest_digis[n];
  	}

  	/* Build a packet */

  	/* Sanity check the packet size */
  	if (len > 65535)
  		return -EMSGSIZE;

  	size = len + AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
  
  	if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
  		return err;
  
  	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN);
  
  	/*
  	 *	Put the data on the end
  	 */

  	skb_reset_transport_header(skb);
  	skb_put(skb, len);

  	err = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);

  	if (err) {
  		kfree_skb(skb);
  		return err;
  	}
  
  	/*
  	 *	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 (rose->qbitincl) {
  		qbit = skb->data[0];
  		skb_pull(skb, 1);
  	}
  
  	/*
  	 *	Push down the ROSE header
  	 */
  	asmptr = skb_push(skb, ROSE_MIN_LEN);

  	/* Build a ROSE Network header */
  	asmptr[0] = ((rose->lci >> 8) & 0x0F) | ROSE_GFI;
  	asmptr[1] = (rose->lci >> 0) & 0xFF;
  	asmptr[2] = ROSE_DATA;
  
  	if (qbit)
  		asmptr[0] |= ROSE_Q_BIT;

  	if (sk->sk_state != TCP_ESTABLISHED) {
  		kfree_skb(skb);
  		return -ENOTCONN;
  	}
  
  #ifdef M_BIT
  #define ROSE_PACLEN (256-ROSE_MIN_LEN)
  	if (skb->len - ROSE_MIN_LEN > ROSE_PACLEN) {
  		unsigned char header[ROSE_MIN_LEN];
  		struct sk_buff *skbn;
  		int frontlen;
  		int lg;
  
  		/* Save a copy of the Header */

  		skb_copy_from_linear_data(skb, header, ROSE_MIN_LEN);

  		skb_pull(skb, ROSE_MIN_LEN);
  
  		frontlen = skb_headroom(skb);
  
  		while (skb->len > 0) {
  			if ((skbn = sock_alloc_send_skb(sk, frontlen + ROSE_PACLEN, 0, &err)) == NULL) {
  				kfree_skb(skb);
  				return err;
  			}
  
  			skbn->sk   = sk;
  			skbn->free = 1;
  			skbn->arp  = 1;
  
  			skb_reserve(skbn, frontlen);
  
  			lg = (ROSE_PACLEN > skb->len) ? skb->len : ROSE_PACLEN;
  
  			/* Copy the user data */

  			skb_copy_from_linear_data(skb, skb_put(skbn, lg), lg);

  			skb_pull(skb, lg);
  
  			/* Duplicate the Header */
  			skb_push(skbn, ROSE_MIN_LEN);

  			skb_copy_to_linear_data(skbn, header, ROSE_MIN_LEN);

  
  			if (skb->len > 0)
  				skbn->data[2] |= M_BIT;
  
  			skb_queue_tail(&sk->sk_write_queue, skbn); /* Throw it on the queue */
  		}
  
  		skb->free = 1;
  		kfree_skb(skb);
  	} else {
  		skb_queue_tail(&sk->sk_write_queue, skb);		/* Throw it on the queue */
  	}
  #else
  	skb_queue_tail(&sk->sk_write_queue, skb);	/* Shove it onto the queue */
  #endif
  
  	rose_kick(sk);
  
  	return len;
  }
  
  
  static int rose_recvmsg(struct kiocb *iocb, struct socket *sock,
  			struct msghdr *msg, size_t size, int flags)
  {
  	struct sock *sk = sock->sk;
  	struct rose_sock *rose = rose_sk(sk);
  	struct sockaddr_rose *srose = (struct sockaddr_rose *)msg->msg_name;
  	size_t copied;
  	unsigned char *asmptr;
  	struct sk_buff *skb;
  	int n, er, qbit;
  
  	/*
  	 * This works for seqpacket too. The receiver has ordered the queue for
  	 * us! We do one quick check first though
  	 */
  	if (sk->sk_state != TCP_ESTABLISHED)
  		return -ENOTCONN;
  
  	/* Now we can treat all alike */
  	if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL)
  		return er;
  
  	qbit = (skb->data[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
  
  	skb_pull(skb, ROSE_MIN_LEN);
  
  	if (rose->qbitincl) {
  		asmptr  = skb_push(skb, 1);
  		*asmptr = qbit;
  	}

  	skb_reset_transport_header(skb);

  	copied     = skb->len;
  
  	if (copied > size) {
  		copied = size;
  		msg->msg_flags |= MSG_TRUNC;
  	}
  
  	skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
  
  	if (srose != NULL) {
  		srose->srose_family = AF_ROSE;
  		srose->srose_addr   = rose->dest_addr;
  		srose->srose_call   = rose->dest_call;
  		srose->srose_ndigis = rose->dest_ndigis;
  		if (msg->msg_namelen >= sizeof(struct full_sockaddr_rose)) {
  			struct full_sockaddr_rose *full_srose = (struct full_sockaddr_rose *)msg->msg_name;
  			for (n = 0 ; n < rose->dest_ndigis ; n++)
  				full_srose->srose_digis[n] = rose->dest_digis[n];
  			msg->msg_namelen = sizeof(struct full_sockaddr_rose);
  		} else {
  			if (rose->dest_ndigis >= 1) {
  				srose->srose_ndigis = 1;
  				srose->srose_digi = rose->dest_digis[0];
  			}
  			msg->msg_namelen = sizeof(struct sockaddr_rose);
  		}
  	}
  
  	skb_free_datagram(sk, skb);
  
  	return copied;
  }
  
  
  static int rose_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  {
  	struct sock *sk = sock->sk;
  	struct rose_sock *rose = rose_sk(sk);
  	void __user *argp = (void __user *)arg;
  
  	switch (cmd) {
  	case TIOCOUTQ: {
  		long amount;

  
  		amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);

  		if (amount < 0)
  			amount = 0;

  		return put_user(amount, (unsigned int __user *) argp);

  	}
  
  	case TIOCINQ: {
  		struct sk_buff *skb;
  		long amount = 0L;
  		/* These two are safe on a single CPU system as only user tasks fiddle here */
  		if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
  			amount = skb->len;

  		return put_user(amount, (unsigned int __user *) argp);

  	}
  
  	case SIOCGSTAMP:

  		return sock_get_timestamp(sk, (struct timeval __user *) argp);

  	case SIOCGSTAMPNS:
  		return sock_get_timestampns(sk, (struct timespec __user *) argp);

  	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:
  	case SIOCRSCLRRT:
  		if (!capable(CAP_NET_ADMIN))
  			return -EPERM;
  		return rose_rt_ioctl(cmd, argp);
  
  	case SIOCRSGCAUSE: {
  		struct rose_cause_struct rose_cause;
  		rose_cause.cause      = rose->cause;
  		rose_cause.diagnostic = rose->diagnostic;
  		return copy_to_user(argp, &rose_cause, sizeof(struct rose_cause_struct)) ? -EFAULT : 0;
  	}
  
  	case SIOCRSSCAUSE: {
  		struct rose_cause_struct rose_cause;
  		if (copy_from_user(&rose_cause, argp, sizeof(struct rose_cause_struct)))
  			return -EFAULT;
  		rose->cause      = rose_cause.cause;
  		rose->diagnostic = rose_cause.diagnostic;
  		return 0;
  	}
  
  	case SIOCRSSL2CALL:
  		if (!capable(CAP_NET_ADMIN)) return -EPERM;
  		if (ax25cmp(&rose_callsign, &null_ax25_address) != 0)
  			ax25_listen_release(&rose_callsign, NULL);
  		if (copy_from_user(&rose_callsign, argp, sizeof(ax25_address)))
  			return -EFAULT;
  		if (ax25cmp(&rose_callsign, &null_ax25_address) != 0)

  			return ax25_listen_register(&rose_callsign, NULL);

  		return 0;
  
  	case SIOCRSGL2CALL:
  		return copy_to_user(argp, &rose_callsign, sizeof(ax25_address)) ? -EFAULT : 0;
  
  	case SIOCRSACCEPT:
  		if (rose->state == ROSE_STATE_5) {
  			rose_write_internal(sk, ROSE_CALL_ACCEPTED);
  			rose_start_idletimer(sk);
  			rose->condition = 0x00;
  			rose->vs        = 0;
  			rose->va        = 0;
  			rose->vr        = 0;
  			rose->vl        = 0;
  			rose->state     = ROSE_STATE_3;
  		}
  		return 0;
  
  	default:

  		return -ENOIOCTLCMD;

  	}
  
  	return 0;
  }
  
  #ifdef CONFIG_PROC_FS
  static void *rose_info_start(struct seq_file *seq, loff_t *pos)

  	__acquires(rose_list_lock)

  {

  	spin_lock_bh(&rose_list_lock);

  	return seq_hlist_start_head(&rose_list, *pos);

  }
  
  static void *rose_info_next(struct seq_file *seq, void *v, loff_t *pos)
  {

  	return seq_hlist_next(v, &rose_list, pos);

  }

  static void rose_info_stop(struct seq_file *seq, void *v)

  	__releases(rose_list_lock)

  {
  	spin_unlock_bh(&rose_list_lock);
  }
  
  static int rose_info_show(struct seq_file *seq, void *v)
  {

  	char buf[11], rsbuf[11];

  	if (v == SEQ_START_TOKEN)

  		seq_puts(seq,

  			 "dest_addr  dest_call src_addr   src_call  dev   lci neigh st vs vr va   t  t1  t2  t3  hb    idle Snd-Q Rcv-Q inode
  ");
  
  	else {

  		struct sock *s = sk_entry(v);

  		struct rose_sock *rose = rose_sk(s);
  		const char *devname, *callsign;
  		const struct net_device *dev = rose->device;
  
  		if (!dev)
  			devname = "???";
  		else
  			devname = dev->name;

  		seq_printf(seq, "%-10s %-9s ",

  			   rose2asc(rsbuf, &rose->dest_addr),
  			   ax2asc(buf, &rose->dest_call));

  
  		if (ax25cmp(&rose->source_call, &null_ax25_address) == 0)
  			callsign = "??????-?";
  		else

  			callsign = ax2asc(buf, &rose->source_call);

  
  		seq_printf(seq,
  			   "%-10s %-9s %-5s %3.3X %05d  %d  %d  %d  %d %3lu %3lu %3lu %3lu %3lu %3lu/%03lu %5d %5d %ld
  ",

  			rose2asc(rsbuf, &rose->source_addr),

  			callsign,
  			devname,
  			rose->lci & 0x0FFF,
  			(rose->neighbour) ? rose->neighbour->number : 0,
  			rose->state,
  			rose->vs,
  			rose->vr,
  			rose->va,
  			ax25_display_timer(&rose->timer) / HZ,
  			rose->t1 / HZ,
  			rose->t2 / HZ,
  			rose->t3 / HZ,
  			rose->hb / HZ,
  			ax25_display_timer(&rose->idletimer) / (60 * HZ),
  			rose->idle / (60 * HZ),

  			sk_wmem_alloc_get(s),
  			sk_rmem_alloc_get(s),

  			s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
  	}
  
  	return 0;
  }

  static const struct seq_operations rose_info_seqops = {

  	.start = rose_info_start,
  	.next = rose_info_next,
  	.stop = rose_info_stop,
  	.show = rose_info_show,
  };
  
  static int rose_info_open(struct inode *inode, struct file *file)
  {
  	return seq_open(file, &rose_info_seqops);
  }

  static const struct file_operations rose_info_fops = {

  	.owner = THIS_MODULE,
  	.open = rose_info_open,
  	.read = seq_read,
  	.llseek = seq_lseek,
  	.release = seq_release,
  };
  #endif	/* CONFIG_PROC_FS */

  static const struct net_proto_family rose_family_ops = {

  	.family		=	PF_ROSE,
  	.create		=	rose_create,
  	.owner		=	THIS_MODULE,
  };

  static const struct proto_ops rose_proto_ops = {

  	.family		=	PF_ROSE,
  	.owner		=	THIS_MODULE,
  	.release	=	rose_release,
  	.bind		=	rose_bind,
  	.connect	=	rose_connect,
  	.socketpair	=	sock_no_socketpair,
  	.accept		=	rose_accept,
  	.getname	=	rose_getname,
  	.poll		=	datagram_poll,
  	.ioctl		=	rose_ioctl,
  	.listen		=	rose_listen,
  	.shutdown	=	sock_no_shutdown,
  	.setsockopt	=	rose_setsockopt,
  	.getsockopt	=	rose_getsockopt,
  	.sendmsg	=	rose_sendmsg,
  	.recvmsg	=	rose_recvmsg,
  	.mmap		=	sock_no_mmap,
  	.sendpage	=	sock_no_sendpage,
  };
  
  static struct notifier_block rose_dev_notifier = {
  	.notifier_call	=	rose_device_event,
  };
  
  static struct net_device **dev_rose;

  static struct ax25_protocol rose_pid = {
  	.pid	= AX25_P_ROSE,
  	.func	= rose_route_frame
  };

  static struct ax25_linkfail rose_linkfail_notifier = {
  	.func	= rose_link_failed
  };

  static int __init rose_proto_init(void)
  {
  	int i;

  	int rc;

  	if (rose_ndevs > 0x7FFFFFFF/sizeof(struct net_device *)) {
  		printk(KERN_ERR "ROSE: rose_proto_init - rose_ndevs parameter to large
  ");
  		rc = -EINVAL;
  		goto out;
  	}
  
  	rc = proto_register(&rose_proto, 0);

  	if (rc != 0)
  		goto out;
  
  	rose_callsign = null_ax25_address;

  	dev_rose = kzalloc(rose_ndevs * sizeof(struct net_device *), GFP_KERNEL);

  	if (dev_rose == NULL) {
  		printk(KERN_ERR "ROSE: rose_proto_init - unable to allocate device structure
  ");

  		rc = -ENOMEM;
  		goto out_proto_unregister;

  	}

  	for (i = 0; i < rose_ndevs; i++) {
  		struct net_device *dev;
  		char name[IFNAMSIZ];
  
  		sprintf(name, "rose%d", i);

  		dev = alloc_netdev(0, name, rose_setup);

  		if (!dev) {
  			printk(KERN_ERR "ROSE: rose_proto_init - unable to allocate memory
  ");

  			rc = -ENOMEM;

  			goto fail;
  		}

  		rc = register_netdev(dev);
  		if (rc) {

  			printk(KERN_ERR "ROSE: netdevice registration failed
  ");

  			free_netdev(dev);
  			goto fail;
  		}

  		rose_set_lockdep_key(dev);

  		dev_rose[i] = dev;
  	}
  
  	sock_register(&rose_family_ops);
  	register_netdevice_notifier(&rose_dev_notifier);

  	ax25_register_pid(&rose_pid);

  	ax25_linkfail_register(&rose_linkfail_notifier);

  
  #ifdef CONFIG_SYSCTL
  	rose_register_sysctl();
  #endif
  	rose_loopback_init();
  
  	rose_add_loopback_neigh();

  	proc_net_fops_create(&init_net, "rose", S_IRUGO, &rose_info_fops);
  	proc_net_fops_create(&init_net, "rose_neigh", S_IRUGO, &rose_neigh_fops);
  	proc_net_fops_create(&init_net, "rose_nodes", S_IRUGO, &rose_nodes_fops);
  	proc_net_fops_create(&init_net, "rose_routes", S_IRUGO, &rose_routes_fops);

  out:
  	return rc;
  fail:
  	while (--i >= 0) {
  		unregister_netdev(dev_rose[i]);
  		free_netdev(dev_rose[i]);
  	}
  	kfree(dev_rose);

  out_proto_unregister:

  	proto_unregister(&rose_proto);

  	goto out;

  }
  module_init(rose_proto_init);
  
  module_param(rose_ndevs, int, 0);
  MODULE_PARM_DESC(rose_ndevs, "number of ROSE devices");
  
  MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
  MODULE_DESCRIPTION("The amateur radio ROSE network layer protocol");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS_NETPROTO(PF_ROSE);
  
  static void __exit rose_exit(void)
  {
  	int i;

  	proc_net_remove(&init_net, "rose");
  	proc_net_remove(&init_net, "rose_neigh");
  	proc_net_remove(&init_net, "rose_nodes");
  	proc_net_remove(&init_net, "rose_routes");

  	rose_loopback_clear();
  
  	rose_rt_free();
  
  	ax25_protocol_release(AX25_P_ROSE);

  	ax25_linkfail_release(&rose_linkfail_notifier);

  
  	if (ax25cmp(&rose_callsign, &null_ax25_address) != 0)
  		ax25_listen_release(&rose_callsign, NULL);
  
  #ifdef CONFIG_SYSCTL
  	rose_unregister_sysctl();
  #endif
  	unregister_netdevice_notifier(&rose_dev_notifier);
  
  	sock_unregister(PF_ROSE);
  
  	for (i = 0; i < rose_ndevs; i++) {
  		struct net_device *dev = dev_rose[i];
  
  		if (dev) {
  			unregister_netdev(dev);
  			free_netdev(dev);
  		}
  	}
  
  	kfree(dev_rose);
  	proto_unregister(&rose_proto);
  }
  
  module_exit(rose_exit);