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af_x25.c

/*
 *    X.25 Packet Layer release 002
 *
 *    This is ALPHA test software. This code may break your machine,
 *    randomly fail to work with new releases, misbehave and/or generally
 *    screw up. It might even work.
 *
 *    This code REQUIRES 2.1.15 or higher
 *
 *    This module:
 *          This module is free software; you can redistribute it and/or
 *          modify it under the terms of the GNU General Public License
 *          as published by the Free Software Foundation; either version
 *          2 of the License, or (at your option) any later version.
 *
 *    History
 *    X.25 001    Jonathan Naylor   Started coding.
 *    X.25 002    Jonathan Naylor   Centralised disconnect handling.
 *                            New timer architecture.
 *    2000-03-11  Henner Eisen      MSG_EOR handling more POSIX compliant.
 *    2000-03-22  Daniela Squassoni Allowed disabling/enabling of
 *                              facilities negotiation and increased
 *                              the throughput upper limit.
 *    2000-08-27  Arnaldo C. Melo s/suser/capable/ + micro cleanups
 *    2000-09-04  Henner Eisen      Set sock->state in x25_accept().
 *                            Fixed x25_output() related skb leakage.
 *    2000-10-02  Henner Eisen      Made x25_kick() single threaded per socket.
 *    2000-10-27  Henner Eisen    MSG_DONTWAIT for fragment allocation.
 *    2000-11-14  Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
 *    2002-10-06  Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
 *                            x25_proc.c, using seq_file
 *    2005-04-02  Shaun Pereira     Selective sub address matching
 *                            with call user data
 *    2005-04-15  Shaun Pereira     Fast select with no restriction on
 *                            response
 */

#include <linux/module.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <asm/uaccess.h>
#include <linux/fcntl.h>
#include <linux/termios.h>    /* For TIOCINQ/OUTQ */
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/compat.h>

#include <net/x25.h>
#include <net/compat.h>

int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
int sysctl_x25_forward                 = 0;

HLIST_HEAD(x25_list);
DEFINE_RWLOCK(x25_list_lock);

static const struct proto_ops x25_proto_ops;

static struct x25_address null_x25_address = {"               "};

#ifdef CONFIG_COMPAT
struct compat_x25_subscrip_struct {
      char device[200-sizeof(compat_ulong_t)];
      compat_ulong_t global_facil_mask;
      compat_uint_t extended;
};
#endif

int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
              struct x25_address *calling_addr)
{
      int called_len, calling_len;
      char *called, *calling;
      int i;

      called_len  = (*p >> 0) & 0x0F;
      calling_len = (*p >> 4) & 0x0F;

      called  = called_addr->x25_addr;
      calling = calling_addr->x25_addr;
      p++;

      for (i = 0; i < (called_len + calling_len); i++) {
            if (i < called_len) {
                  if (i % 2 != 0) {
                        *called++ = ((*p >> 0) & 0x0F) + '0';
                        p++;
                  } else {
                        *called++ = ((*p >> 4) & 0x0F) + '0';
                  }
            } else {
                  if (i % 2 != 0) {
                        *calling++ = ((*p >> 0) & 0x0F) + '0';
                        p++;
                  } else {
                        *calling++ = ((*p >> 4) & 0x0F) + '0';
                  }
            }
      }

      *called = *calling = '\0';

      return 1 + (called_len + calling_len + 1) / 2;
}

int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
              struct x25_address *calling_addr)
{
      unsigned int called_len, calling_len;
      char *called, *calling;
      int i;

      called  = called_addr->x25_addr;
      calling = calling_addr->x25_addr;

      called_len  = strlen(called);
      calling_len = strlen(calling);

      *p++ = (calling_len << 4) | (called_len << 0);

      for (i = 0; i < (called_len + calling_len); i++) {
            if (i < called_len) {
                  if (i % 2 != 0) {
                        *p |= (*called++ - '0') << 0;
                        p++;
                  } else {
                        *p = 0x00;
                        *p |= (*called++ - '0') << 4;
                  }
            } else {
                  if (i % 2 != 0) {
                        *p |= (*calling++ - '0') << 0;
                        p++;
                  } else {
                        *p = 0x00;
                        *p |= (*calling++ - '0') << 4;
                  }
            }
      }

      return 1 + (called_len + calling_len + 1) / 2;
}

/*
 *    Socket removal during an interrupt is now safe.
 */
static void x25_remove_socket(struct sock *sk)
{
      write_lock_bh(&x25_list_lock);
      sk_del_node_init(sk);
      write_unlock_bh(&x25_list_lock);
}

/*
 *    Kill all bound sockets on a dropped device.
 */
static void x25_kill_by_device(struct net_device *dev)
{
      struct sock *s;
      struct hlist_node *node;

      write_lock_bh(&x25_list_lock);

      sk_for_each(s, node, &x25_list)
            if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
                  x25_disconnect(s, ENETUNREACH, 0, 0);

      write_unlock_bh(&x25_list_lock);
}

/*
 *    Handle device status changes.
 */
static int x25_device_event(struct notifier_block *this, unsigned long event,
                      void *ptr)
{
      struct net_device *dev = ptr;
      struct x25_neigh *nb;

      if (dev->nd_net != &init_net)
            return NOTIFY_DONE;

      if (dev->type == ARPHRD_X25
#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
       || dev->type == ARPHRD_ETHER
#endif
       ) {
            switch (event) {
                  case NETDEV_UP:
                        x25_link_device_up(dev);
                        break;
                  case NETDEV_GOING_DOWN:
                        nb = x25_get_neigh(dev);
                        if (nb) {
                              x25_terminate_link(nb);
                              x25_neigh_put(nb);
                        }
                        break;
                  case NETDEV_DOWN:
                        x25_kill_by_device(dev);
                        x25_route_device_down(dev);
                        x25_link_device_down(dev);
                        break;
            }
      }

      return NOTIFY_DONE;
}

/*
 *    Add a socket to the bound sockets list.
 */
static void x25_insert_socket(struct sock *sk)
{
      write_lock_bh(&x25_list_lock);
      sk_add_node(sk, &x25_list);
      write_unlock_bh(&x25_list_lock);
}

/*
 *    Find a socket that wants to accept the Call Request we just
 *    received. Check the full list for an address/cud match.
 *    If no cuds match return the next_best thing, an address match.
 *    Note: if a listening socket has cud set it must only get calls
 *    with matching cud.
 */
static struct sock *x25_find_listener(struct x25_address *addr,
                              struct sk_buff *skb)
{
      struct sock *s;
      struct sock *next_best;
      struct hlist_node *node;

      read_lock_bh(&x25_list_lock);
      next_best = NULL;

      sk_for_each(s, node, &x25_list)
            if ((!strcmp(addr->x25_addr,
                  x25_sk(s)->source_addr.x25_addr) ||
                        !strcmp(addr->x25_addr,
                              null_x25_address.x25_addr)) &&
                              s->sk_state == TCP_LISTEN) {
                  /*
                   * Found a listening socket, now check the incoming
                   * call user data vs this sockets call user data
                   */
                  if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
                        if((memcmp(x25_sk(s)->calluserdata.cuddata,
                              skb->data,
                              x25_sk(s)->cudmatchlength)) == 0) {
                              sock_hold(s);
                              goto found;
                         }
                  } else
                        next_best = s;
            }
      if (next_best) {
            s = next_best;
            sock_hold(s);
            goto found;
      }
      s = NULL;
found:
      read_unlock_bh(&x25_list_lock);
      return s;
}

/*
 *    Find a connected X.25 socket given my LCI and neighbour.
 */
static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
{
      struct sock *s;
      struct hlist_node *node;

      sk_for_each(s, node, &x25_list)
            if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
                  sock_hold(s);
                  goto found;
            }
      s = NULL;
found:
      return s;
}

struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
{
      struct sock *s;

      read_lock_bh(&x25_list_lock);
      s = __x25_find_socket(lci, nb);
      read_unlock_bh(&x25_list_lock);
      return s;
}

/*
 *    Find a unique LCI for a given device.
 */
static unsigned int x25_new_lci(struct x25_neigh *nb)
{
      unsigned int lci = 1;
      struct sock *sk;

      read_lock_bh(&x25_list_lock);

      while ((sk = __x25_find_socket(lci, nb)) != NULL) {
            sock_put(sk);
            if (++lci == 4096) {
                  lci = 0;
                  break;
            }
      }

      read_unlock_bh(&x25_list_lock);
      return lci;
}

/*
 *    Deferred destroy.
 */
void x25_destroy_socket(struct sock *);

/*
 *    handler for deferred kills.
 */
static void x25_destroy_timer(unsigned long data)
{
      x25_destroy_socket((struct sock *)data);
}

/*
 *    This is called from user mode and the timers. Thus it protects itself
 *    against interrupt users but doesn't worry about being called during
 *    work. Once it is removed from the queue no interrupt or bottom half
 *    will touch it and we are (fairly 8-) ) safe.
 *    Not static as it's used by the timer
 */
void x25_destroy_socket(struct sock *sk)
{
      struct sk_buff *skb;

      sock_hold(sk);
      lock_sock(sk);
      x25_stop_heartbeat(sk);
      x25_stop_timer(sk);

      x25_remove_socket(sk);
      x25_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);
                  x25_start_heartbeat(skb->sk);
                  x25_sk(skb->sk)->state = X25_STATE_0;
            }

            kfree_skb(skb);
      }

      if (atomic_read(&sk->sk_wmem_alloc) ||
          atomic_read(&sk->sk_rmem_alloc)) {
            /* Defer: outstanding buffers */
            sk->sk_timer.expires  = jiffies + 10 * HZ;
            sk->sk_timer.function = x25_destroy_timer;
            sk->sk_timer.data = (unsigned long)sk;
            add_timer(&sk->sk_timer);
      } else {
            /* drop last reference so sock_put will free */
            __sock_put(sk);
      }

      release_sock(sk);
      sock_put(sk);
}

/*
 *    Handling for system calls applied via the various interfaces to a
 *    X.25 socket object.
 */

static int x25_setsockopt(struct socket *sock, int level, int optname,
                    char __user *optval, int optlen)
{
      int opt;
      struct sock *sk = sock->sk;
      int rc = -ENOPROTOOPT;

      if (level != SOL_X25 || optname != X25_QBITINCL)
            goto out;

      rc = -EINVAL;
      if (optlen < sizeof(int))
            goto out;

      rc = -EFAULT;
      if (get_user(opt, (int __user *)optval))
            goto out;

      x25_sk(sk)->qbitincl = !!opt;
      rc = 0;
out:
      return rc;
}

static int x25_getsockopt(struct socket *sock, int level, int optname,
                    char __user *optval, int __user *optlen)
{
      struct sock *sk = sock->sk;
      int val, len, rc = -ENOPROTOOPT;

      if (level != SOL_X25 || optname != X25_QBITINCL)
            goto out;

      rc = -EFAULT;
      if (get_user(len, optlen))
            goto out;

      len = min_t(unsigned int, len, sizeof(int));

      rc = -EINVAL;
      if (len < 0)
            goto out;

      rc = -EFAULT;
      if (put_user(len, optlen))
            goto out;

      val = x25_sk(sk)->qbitincl;
      rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
out:
      return rc;
}

static int x25_listen(struct socket *sock, int backlog)
{
      struct sock *sk = sock->sk;
      int rc = -EOPNOTSUPP;

      if (sk->sk_state != TCP_LISTEN) {
            memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
            sk->sk_max_ack_backlog = backlog;
            sk->sk_state           = TCP_LISTEN;
            rc = 0;
      }

      return rc;
}

static struct proto x25_proto = {
      .name   = "X25",
      .owner        = THIS_MODULE,
      .obj_size = sizeof(struct x25_sock),
};

static struct sock *x25_alloc_socket(struct net *net)
{
      struct x25_sock *x25;
      struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);

      if (!sk)
            goto out;

      sock_init_data(NULL, sk);

      x25 = x25_sk(sk);
      skb_queue_head_init(&x25->ack_queue);
      skb_queue_head_init(&x25->fragment_queue);
      skb_queue_head_init(&x25->interrupt_in_queue);
      skb_queue_head_init(&x25->interrupt_out_queue);
out:
      return sk;
}

static int x25_create(struct net *net, struct socket *sock, int protocol)
{
      struct sock *sk;
      struct x25_sock *x25;
      int rc = -ESOCKTNOSUPPORT;

      if (net != &init_net)
            return -EAFNOSUPPORT;

      if (sock->type != SOCK_SEQPACKET || protocol)
            goto out;

      rc = -ENOMEM;
      if ((sk = x25_alloc_socket(net)) == NULL)
            goto out;

      x25 = x25_sk(sk);

      sock_init_data(sock, sk);

      x25_init_timers(sk);

      sock->ops    = &x25_proto_ops;
      sk->sk_protocol = protocol;
      sk->sk_backlog_rcv = x25_backlog_rcv;

      x25->t21   = sysctl_x25_call_request_timeout;
      x25->t22   = sysctl_x25_reset_request_timeout;
      x25->t23   = sysctl_x25_clear_request_timeout;
      x25->t2    = sysctl_x25_ack_holdback_timeout;
      x25->state = X25_STATE_0;
      x25->cudmatchlength = 0;
      x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
                                          /* on call accept   */

      x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
      x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
      x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
      x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
      x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
      x25->facilities.reverse     = X25_DEFAULT_REVERSE;
      x25->dte_facilities.calling_len = 0;
      x25->dte_facilities.called_len = 0;
      memset(x25->dte_facilities.called_ae, '\0',
                  sizeof(x25->dte_facilities.called_ae));
      memset(x25->dte_facilities.calling_ae, '\0',
                  sizeof(x25->dte_facilities.calling_ae));

      rc = 0;
out:
      return rc;
}

static struct sock *x25_make_new(struct sock *osk)
{
      struct sock *sk = NULL;
      struct x25_sock *x25, *ox25;

      if (osk->sk_type != SOCK_SEQPACKET)
            goto out;

      if ((sk = x25_alloc_socket(osk->sk_net)) == NULL)
            goto out;

      x25 = x25_sk(sk);

      sk->sk_type        = osk->sk_type;
      sk->sk_socket      = osk->sk_socket;
      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;
      sk->sk_sleep       = osk->sk_sleep;
      sk->sk_backlog_rcv = osk->sk_backlog_rcv;
      sock_copy_flags(sk, osk);

      ox25 = x25_sk(osk);
      x25->t21        = ox25->t21;
      x25->t22        = ox25->t22;
      x25->t23        = ox25->t23;
      x25->t2         = ox25->t2;
      x25->facilities = ox25->facilities;
      x25->qbitincl   = ox25->qbitincl;
      x25->dte_facilities = ox25->dte_facilities;
      x25->cudmatchlength = ox25->cudmatchlength;
      x25->accptapprv = ox25->accptapprv;

      x25_init_timers(sk);
out:
      return sk;
}

static int x25_release(struct socket *sock)
{
      struct sock *sk = sock->sk;
      struct x25_sock *x25;

      if (!sk)
            goto out;

      x25 = x25_sk(sk);

      switch (x25->state) {

            case X25_STATE_0:
            case X25_STATE_2:
                  x25_disconnect(sk, 0, 0, 0);
                  x25_destroy_socket(sk);
                  goto out;

            case X25_STATE_1:
            case X25_STATE_3:
            case X25_STATE_4:
                  x25_clear_queues(sk);
                  x25_write_internal(sk, X25_CLEAR_REQUEST);
                  x25_start_t23timer(sk);
                  x25->state = X25_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;
      }

      sock->sk    = NULL;
      sk->sk_socket     = NULL;     /* Not used, but we should do this */
out:
      return 0;
}

static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
      struct sock *sk = sock->sk;
      struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;

      if (!sock_flag(sk, SOCK_ZAPPED) ||
          addr_len != sizeof(struct sockaddr_x25) ||
          addr->sx25_family != AF_X25)
            return -EINVAL;

      x25_sk(sk)->source_addr = addr->sx25_addr;
      x25_insert_socket(sk);
      sock_reset_flag(sk, SOCK_ZAPPED);
      SOCK_DEBUG(sk, "x25_bind: socket is bound\n");

      return 0;
}

static int x25_wait_for_connection_establishment(struct sock *sk)
{
      DECLARE_WAITQUEUE(wait, current);
      int rc;

      add_wait_queue_exclusive(sk->sk_sleep, &wait);
      for (;;) {
            __set_current_state(TASK_INTERRUPTIBLE);
            rc = -ERESTARTSYS;
            if (signal_pending(current))
                  break;
            rc = sock_error(sk);
            if (rc) {
                  sk->sk_socket->state = SS_UNCONNECTED;
                  break;
            }
            rc = 0;
            if (sk->sk_state != TCP_ESTABLISHED) {
                  release_sock(sk);
                  schedule();
                  lock_sock(sk);
            } else
                  break;
      }
      __set_current_state(TASK_RUNNING);
      remove_wait_queue(sk->sk_sleep, &wait);
      return rc;
}

static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
                   int addr_len, int flags)
{
      struct sock *sk = sock->sk;
      struct x25_sock *x25 = x25_sk(sk);
      struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
      struct x25_route *rt;
      int rc = 0;

      lock_sock(sk);
      if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
            sock->state = SS_CONNECTED;
            goto out; /* Connect completed during a ERESTARTSYS event */
      }

      rc = -ECONNREFUSED;
      if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
            sock->state = SS_UNCONNECTED;
            goto out;
      }

      rc = -EISCONN;    /* No reconnect on a seqpacket socket */
      if (sk->sk_state == TCP_ESTABLISHED)
            goto out;

      sk->sk_state   = TCP_CLOSE;
      sock->state = SS_UNCONNECTED;

      rc = -EINVAL;
      if (addr_len != sizeof(struct sockaddr_x25) ||
          addr->sx25_family != AF_X25)
            goto out;

      rc = -ENETUNREACH;
      rt = x25_get_route(&addr->sx25_addr);
      if (!rt)
            goto out;

      x25->neighbour = x25_get_neigh(rt->dev);
      if (!x25->neighbour)
            goto out_put_route;

      x25_limit_facilities(&x25->facilities, x25->neighbour);

      x25->lci = x25_new_lci(x25->neighbour);
      if (!x25->lci)
            goto out_put_neigh;

      rc = -EINVAL;
      if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
            goto out_put_neigh;

      if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
            memset(&x25->source_addr, '\0', X25_ADDR_LEN);

      x25->dest_addr = addr->sx25_addr;

      /* Move to connecting socket, start sending Connect Requests */
      sock->state   = SS_CONNECTING;
      sk->sk_state  = TCP_SYN_SENT;

      x25->state = X25_STATE_1;

      x25_write_internal(sk, X25_CALL_REQUEST);

      x25_start_heartbeat(sk);
      x25_start_t21timer(sk);

      /* Now the loop */
      rc = -EINPROGRESS;
      if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
            goto out_put_neigh;

      rc = x25_wait_for_connection_establishment(sk);
      if (rc)
            goto out_put_neigh;

      sock->state = SS_CONNECTED;
      rc = 0;
out_put_neigh:
      if (rc)
            x25_neigh_put(x25->neighbour);
out_put_route:
      x25_route_put(rt);
out:
      release_sock(sk);
      return rc;
}

static int x25_wait_for_data(struct sock *sk, long timeout)
{
      DECLARE_WAITQUEUE(wait, current);
      int rc = 0;

      add_wait_queue_exclusive(sk->sk_sleep, &wait);
      for (;;) {
            __set_current_state(TASK_INTERRUPTIBLE);
            if (sk->sk_shutdown & RCV_SHUTDOWN)
                  break;
            rc = -ERESTARTSYS;
            if (signal_pending(current))
                  break;
            rc = -EAGAIN;
            if (!timeout)
                  break;
            rc = 0;
            if (skb_queue_empty(&sk->sk_receive_queue)) {
                  release_sock(sk);
                  timeout = schedule_timeout(timeout);
                  lock_sock(sk);
            } else
                  break;
      }
      __set_current_state(TASK_RUNNING);
      remove_wait_queue(sk->sk_sleep, &wait);
      return rc;
}

static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
{
      struct sock *sk = sock->sk;
      struct sock *newsk;
      struct sk_buff *skb;
      int rc = -EINVAL;

      if (!sk || sk->sk_state != TCP_LISTEN)
            goto out;

      rc = -EOPNOTSUPP;
      if (sk->sk_type != SOCK_SEQPACKET)
            goto out;

      lock_sock(sk);
      rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
      if (rc)
            goto out2;
      skb = skb_dequeue(&sk->sk_receive_queue);
      rc = -EINVAL;
      if (!skb->sk)
            goto out2;
      newsk        = skb->sk;
      newsk->sk_socket = newsock;
      newsk->sk_sleep  = &newsock->wait;

      /* Now attach up the new socket */
      skb->sk = NULL;
      kfree_skb(skb);
      sk->sk_ack_backlog--;
      newsock->sk    = newsk;
      newsock->state = SS_CONNECTED;
      rc = 0;
out2:
      release_sock(sk);
out:
      return rc;
}

static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
                   int *uaddr_len, int peer)
{
      struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
      struct sock *sk = sock->sk;
      struct x25_sock *x25 = x25_sk(sk);

      if (peer) {
            if (sk->sk_state != TCP_ESTABLISHED)
                  return -ENOTCONN;
            sx25->sx25_addr = x25->dest_addr;
      } else
            sx25->sx25_addr = x25->source_addr;

      sx25->sx25_family = AF_X25;
      *uaddr_len = sizeof(*sx25);

      return 0;
}

int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
                  unsigned int lci)
{
      struct sock *sk;
      struct sock *make;
      struct x25_sock *makex25;
      struct x25_address source_addr, dest_addr;
      struct x25_facilities facilities;
      struct x25_dte_facilities dte_facilities;
      int len, addr_len, rc;

      /*
       *    Remove the LCI and frame type.
       */
      skb_pull(skb, X25_STD_MIN_LEN);

      /*
       *    Extract the X.25 addresses and convert them to ASCII strings,
       *    and remove them.
       */
      addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
      skb_pull(skb, addr_len);

      /*
       *    Get the length of the facilities, skip past them for the moment
       *    get the call user data because this is needed to determine
       *    the correct listener
       */
      len = skb->data[0] + 1;
      skb_pull(skb,len);

      /*
       *    Find a listener for the particular address/cud pair.
       */
      sk = x25_find_listener(&source_addr,skb);
      skb_push(skb,len);

      if (sk != NULL && sk_acceptq_is_full(sk)) {
            goto out_sock_put;
      }

      /*
       *    We dont have any listeners for this incoming call.
       *    Try forwarding it.
       */
      if (sk == NULL) {
            skb_push(skb, addr_len + X25_STD_MIN_LEN);
            if (sysctl_x25_forward &&
                        x25_forward_call(&dest_addr, nb, skb, lci) > 0)
            {
                  /* Call was forwarded, dont process it any more */
                  kfree_skb(skb);
                  rc = 1;
                  goto out;
            } else {
                  /* No listeners, can't forward, clear the call */
                  goto out_clear_request;
            }
      }

      /*
       *    Try to reach a compromise on the requested facilities.
       */
      len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
      if (len == -1)
            goto out_sock_put;

      /*
       * current neighbour/link might impose additional limits
       * on certain facilties
       */

      x25_limit_facilities(&facilities, nb);

      /*
       *    Try to create a new socket.
       */
      make = x25_make_new(sk);
      if (!make)
            goto out_sock_put;

      /*
       *    Remove the facilities
       */
      skb_pull(skb, len);

      skb->sk     = make;
      make->sk_state = TCP_ESTABLISHED;

      makex25 = x25_sk(make);
      makex25->lci           = lci;
      makex25->dest_addr     = dest_addr;
      makex25->source_addr   = source_addr;
      makex25->neighbour     = nb;
      makex25->facilities    = facilities;
      makex25->dte_facilities= dte_facilities;
      makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
      /* ensure no reverse facil on accept */
      makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
      /* ensure no calling address extension on accept */
      makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
      makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;

      /* Normally all calls are accepted immediatly */
      if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
            x25_write_internal(make, X25_CALL_ACCEPTED);
            makex25->state = X25_STATE_3;
      }

      /*
       *    Incoming Call User Data.
       */
      if (skb->len >= 0) {
            skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
            makex25->calluserdata.cudlength = skb->len;
      }

      sk->sk_ack_backlog++;

      x25_insert_socket(make);

      skb_queue_head(&sk->sk_receive_queue, skb);

      x25_start_heartbeat(make);

      if (!sock_flag(sk, SOCK_DEAD))
            sk->sk_data_ready(sk, skb->len);
      rc = 1;
      sock_put(sk);
out:
      return rc;
out_sock_put:
      sock_put(sk);
out_clear_request:
      rc = 0;
      x25_transmit_clear_request(nb, lci, 0x01);
      goto out;
}

static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
                   struct msghdr *msg, size_t len)
{
      struct sock *sk = sock->sk;
      struct x25_sock *x25 = x25_sk(sk);
      struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
      struct sockaddr_x25 sx25;
      struct sk_buff *skb;
      unsigned char *asmptr;
      int noblock = msg->msg_flags & MSG_DONTWAIT;
      size_t size;
      int qbit = 0, rc = -EINVAL;

      if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
            goto out;

      /* we currently don't support segmented records at the user interface */
      if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
            goto out;

      rc = -EADDRNOTAVAIL;
      if (sock_flag(sk, SOCK_ZAPPED))
            goto out;

      rc = -EPIPE;
      if (sk->sk_shutdown & SEND_SHUTDOWN) {
            send_sig(SIGPIPE, current, 0);
            goto out;
      }

      rc = -ENETUNREACH;
      if (!x25->neighbour)
            goto out;

      if (usx25) {
            rc = -EINVAL;
            if (msg->msg_namelen < sizeof(sx25))
                  goto out;
            memcpy(&sx25, usx25, sizeof(sx25));
            rc = -EISCONN;
            if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
                  goto out;
            rc = -EINVAL;
            if (sx25.sx25_family != AF_X25)
                  goto out;
      } else {
            /*
             *    FIXME 1003.1g - if the socket is like this because
             *    it has become closed (not started closed) we ought
             *    to SIGPIPE, EPIPE;
             */
            rc = -ENOTCONN;
            if (sk->sk_state != TCP_ESTABLISHED)
                  goto out;

            sx25.sx25_family = AF_X25;
            sx25.sx25_addr   = x25->dest_addr;
      }

      SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");

      /* Build a packet */
      SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");

      if ((msg->msg_flags & MSG_OOB) && len > 32)
            len = 32;

      size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;

      skb = sock_alloc_send_skb(sk, size, noblock, &rc);
      if (!skb)
            goto out;
      X25_SKB_CB(skb)->flags = msg->msg_flags;

      skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);

      /*
       *    Put the data on the end
       */
      SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");

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

      rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
      if (rc)
            goto out_kfree_skb;

      /*
       *    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 (x25->qbitincl) {
            qbit = skb->data[0];
            skb_pull(skb, 1);
      }

      /*
       *    Push down the X.25 header
       */
      SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");

      if (msg->msg_flags & MSG_OOB) {
            if (x25->neighbour->extended) {
                  asmptr    = skb_push(skb, X25_STD_MIN_LEN);
                  *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
                  *asmptr++ = (x25->lci >> 0) & 0xFF;
                  *asmptr++ = X25_INTERRUPT;
            } else {
                  asmptr    = skb_push(skb, X25_STD_MIN_LEN);
                  *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
                  *asmptr++ = (x25->lci >> 0) & 0xFF;
                  *asmptr++ = X25_INTERRUPT;
            }
      } else {
            if (x25->neighbour->extended) {
                  /* Build an Extended X.25 header */
                  asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
                  *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
                  *asmptr++ = (x25->lci >> 0) & 0xFF;
                  *asmptr++ = X25_DATA;
                  *asmptr++ = X25_DATA;
            } else {
                  /* Build an Standard X.25 header */
                  asmptr    = skb_push(skb, X25_STD_MIN_LEN);
                  *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
                  *asmptr++ = (x25->lci >> 0) & 0xFF;
                  *asmptr++ = X25_DATA;
            }

            if (qbit)
                  skb->data[0] |= X25_Q_BIT;
      }

      SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
      SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");

      rc = -ENOTCONN;
      if (sk->sk_state != TCP_ESTABLISHED)
            goto out_kfree_skb;

      if (msg->msg_flags & MSG_OOB)
            skb_queue_tail(&x25->interrupt_out_queue, skb);
      else {
            len = x25_output(sk, skb);
            if (len < 0)
                  kfree_skb(skb);
            else if (x25->qbitincl)
                  len++;
      }

      /*
       * lock_sock() is currently only used to serialize this x25_kick()
       * against input-driven x25_kick() calls. It currently only blocks
       * incoming packets for this socket and does not protect against
       * any other socket state changes and is not called from anywhere
       * else. As x25_kick() cannot block and as long as all socket
       * operations are BKL-wrapped, we don't need take to care about
       * purging the backlog queue in x25_release().
       *
       * Using lock_sock() to protect all socket operations entirely
       * (and making the whole x25 stack SMP aware) unfortunately would
       * require major changes to {send,recv}msg and skb allocation methods.
       * -> 2.5 ;)
       */
      lock_sock(sk);
      x25_kick(sk);
      release_sock(sk);
      rc = len;
out:
      return rc;
out_kfree_skb:
      kfree_skb(skb);
      goto out;
}


static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
                   struct msghdr *msg, size_t size,
                   int flags)
{
      struct sock *sk = sock->sk;
      struct x25_sock *x25 = x25_sk(sk);
      struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
      size_t copied;
      int qbit;
      struct sk_buff *skb;
      unsigned char *asmptr;
      int rc = -ENOTCONN;

      /*
       * 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)
            goto out;

      if (flags & MSG_OOB) {
            rc = -EINVAL;
            if (sock_flag(sk, SOCK_URGINLINE) ||
                !skb_peek(&x25->interrupt_in_queue))
                  goto out;

            skb = skb_dequeue(&x25->interrupt_in_queue);

            skb_pull(skb, X25_STD_MIN_LEN);

            /*
             *    No Q bit information on Interrupt data.
             */
            if (x25->qbitincl) {
                  asmptr  = skb_push(skb, 1);
                  *asmptr = 0x00;
            }

            msg->msg_flags |= MSG_OOB;
      } else {
            /* Now we can treat all alike */
            skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
                              flags & MSG_DONTWAIT, &rc);
            if (!skb)
                  goto out;

            qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;

            skb_pull(skb, x25->neighbour->extended ?
                        X25_EXT_MIN_LEN : X25_STD_MIN_LEN);

            if (x25->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;
      }

      /* Currently, each datagram always contains a complete record */
      msg->msg_flags |= MSG_EOR;

      rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
      if (rc)
            goto out_free_dgram;

      if (sx25) {
            sx25->sx25_family = AF_X25;
            sx25->sx25_addr   = x25->dest_addr;
      }

      msg->msg_namelen = sizeof(struct sockaddr_x25);

      lock_sock(sk);
      x25_check_rbuf(sk);
      release_sock(sk);
      rc = copied;
out_free_dgram:
      skb_free_datagram(sk, skb);
out:
      return rc;
}


static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
      struct sock *sk = sock->sk;
      struct x25_sock *x25 = x25_sk(sk);
      void __user *argp = (void __user *)arg;
      int rc;

      switch (cmd) {
            case TIOCOUTQ: {
                  int amount = sk->sk_sndbuf -
                             atomic_read(&sk->sk_wmem_alloc);
                  if (amount < 0)
                        amount = 0;
                  rc = put_user(amount, (unsigned int __user *)argp);
                  break;
            }

            case TIOCINQ: {
                  struct sk_buff *skb;
                  int amount = 0;
                  /*
                   * 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;
                  rc = put_user(amount, (unsigned int __user *)argp);
                  break;
            }

            case SIOCGSTAMP:
                  rc = -EINVAL;
                  if (sk)
                        rc = sock_get_timestamp(sk,
                                    (struct timeval __user *)argp);
                  break;
            case SIOCGSTAMPNS:
                  rc = -EINVAL;
                  if (sk)
                        rc = sock_get_timestampns(sk,
                                    (struct timespec __user *)argp);
                  break;
            case SIOCGIFADDR:
            case SIOCSIFADDR:
            case SIOCGIFDSTADDR:
            case SIOCSIFDSTADDR:
            case SIOCGIFBRDADDR:
            case SIOCSIFBRDADDR:
            case SIOCGIFNETMASK:
            case SIOCSIFNETMASK:
            case SIOCGIFMETRIC:
            case SIOCSIFMETRIC:
                  rc = -EINVAL;
                  break;
            case SIOCADDRT:
            case SIOCDELRT:
                  rc = -EPERM;
                  if (!capable(CAP_NET_ADMIN))
                        break;
                  rc = x25_route_ioctl(cmd, argp);
                  break;
            case SIOCX25GSUBSCRIP:
                  rc = x25_subscr_ioctl(cmd, argp);
                  break;
            case SIOCX25SSUBSCRIP:
                  rc = -EPERM;
                  if (!capable(CAP_NET_ADMIN))
                        break;
                  rc = x25_subscr_ioctl(cmd, argp);
                  break;
            case SIOCX25GFACILITIES: {
                  struct x25_facilities fac = x25->facilities;
                  rc = copy_to_user(argp, &fac,
                                sizeof(fac)) ? -EFAULT : 0;
                  break;
            }

            case SIOCX25SFACILITIES: {
                  struct x25_facilities facilities;
                  rc = -EFAULT;
                  if (copy_from_user(&facilities, argp,
                                 sizeof(facilities)))
                        break;
                  rc = -EINVAL;
                  if (sk->sk_state != TCP_LISTEN &&
                      sk->sk_state != TCP_CLOSE)
                        break;
                  if (facilities.pacsize_in < X25_PS16 ||
                      facilities.pacsize_in > X25_PS4096)
                        break;
                  if (facilities.pacsize_out < X25_PS16 ||
                      facilities.pacsize_out > X25_PS4096)
                        break;
                  if (facilities.winsize_in < 1 ||
                      facilities.winsize_in > 127)
                        break;
                  if (facilities.throughput < 0x03 ||
                      facilities.throughput > 0xDD)
                        break;
                  if (facilities.reverse &&
                        (facilities.reverse | 0x81)!= 0x81)
                        break;
                  x25->facilities = facilities;
                  rc = 0;
                  break;
            }

            case SIOCX25GDTEFACILITIES: {
                  rc = copy_to_user(argp, &x25->dte_facilities,
                                    sizeof(x25->dte_facilities));
                  if (rc)
                        rc = -EFAULT;
                  break;
            }

            case SIOCX25SDTEFACILITIES: {
                  struct x25_dte_facilities dtefacs;
                  rc = -EFAULT;
                  if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
                        break;
                  rc = -EINVAL;
                  if (sk->sk_state != TCP_LISTEN &&
                              sk->sk_state != TCP_CLOSE)
                        break;
                  if (dtefacs.calling_len > X25_MAX_AE_LEN)
                        break;
                  if (dtefacs.calling_ae == NULL)
                        break;
                  if (dtefacs.called_len > X25_MAX_AE_LEN)
                        break;
                  if (dtefacs.called_ae == NULL)
                        break;
                  x25->dte_facilities = dtefacs;
                  rc = 0;
                  break;
            }

            case SIOCX25GCALLUSERDATA: {
                  struct x25_calluserdata cud = x25->calluserdata;
                  rc = copy_to_user(argp, &cud,
                                sizeof(cud)) ? -EFAULT : 0;
                  break;
            }

            case SIOCX25SCALLUSERDATA: {
                  struct x25_calluserdata calluserdata;

                  rc = -EFAULT;
                  if (copy_from_user(&calluserdata, argp,
                                 sizeof(calluserdata)))
                        break;
                  rc = -EINVAL;
                  if (calluserdata.cudlength > X25_MAX_CUD_LEN)
                        break;
                  x25->calluserdata = calluserdata;
                  rc = 0;
                  break;
            }

            case SIOCX25GCAUSEDIAG: {
                  struct x25_causediag causediag;
                  causediag = x25->causediag;
                  rc = copy_to_user(argp, &causediag,
                                sizeof(causediag)) ? -EFAULT : 0;
                  break;
            }

            case SIOCX25SCUDMATCHLEN: {
                  struct x25_subaddr sub_addr;
                  rc = -EINVAL;
                  if(sk->sk_state != TCP_CLOSE)
                        break;
                  rc = -EFAULT;
                  if (copy_from_user(&sub_addr, argp,
                              sizeof(sub_addr)))
                        break;
                  rc = -EINVAL;
                  if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
                        break;
                  x25->cudmatchlength = sub_addr.cudmatchlength;
                  rc = 0;
                  break;
            }

            case SIOCX25CALLACCPTAPPRV: {
                  rc = -EINVAL;
                  if (sk->sk_state != TCP_CLOSE)
                        break;
                  x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
                  rc = 0;
                  break;
            }

            case SIOCX25SENDCALLACCPT:  {
                  rc = -EINVAL;
                  if (sk->sk_state != TCP_ESTABLISHED)
                        break;
                  if (x25->accptapprv)    /* must call accptapprv above */
                        break;
                  x25_write_internal(sk, X25_CALL_ACCEPTED);
                  x25->state = X25_STATE_3;
                  rc = 0;
                  break;
            }

            default:
                  rc = -ENOIOCTLCMD;
                  break;
      }

      return rc;
}

static struct net_proto_family x25_family_ops = {
      .family =   AF_X25,
      .create =   x25_create,
      .owner      =     THIS_MODULE,
};

#ifdef CONFIG_COMPAT
static int compat_x25_subscr_ioctl(unsigned int cmd,
            struct compat_x25_subscrip_struct __user *x25_subscr32)
{
      struct compat_x25_subscrip_struct x25_subscr;
      struct x25_neigh *nb;
      struct net_device *dev;
      int rc = -EINVAL;

      rc = -EFAULT;
      if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
            goto out;

      rc = -EINVAL;
      dev = x25_dev_get(x25_subscr.device);
      if (dev == NULL)
            goto out;

      nb = x25_get_neigh(dev);
      if (nb == NULL)
            goto out_dev_put;

      dev_put(dev);

      if (cmd == SIOCX25GSUBSCRIP) {
            x25_subscr.extended = nb->extended;
            x25_subscr.global_facil_mask = nb->global_facil_mask;
            rc = copy_to_user(x25_subscr32, &x25_subscr,
                        sizeof(*x25_subscr32)) ? -EFAULT : 0;
      } else {
            rc = -EINVAL;
            if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
                  rc = 0;
                  nb->extended = x25_subscr.extended;
                  nb->global_facil_mask = x25_subscr.global_facil_mask;
            }
      }
      x25_neigh_put(nb);
out:
      return rc;
out_dev_put:
      dev_put(dev);
      goto out;
}

static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
                        unsigned long arg)
{
      void __user *argp = compat_ptr(arg);
      struct sock *sk = sock->sk;

      int rc = -ENOIOCTLCMD;

      switch(cmd) {
      case TIOCOUTQ:
      case TIOCINQ:
            rc = x25_ioctl(sock, cmd, (unsigned long)argp);
            break;
      case SIOCGSTAMP:
            rc = -EINVAL;
            if (sk)
                  rc = compat_sock_get_timestamp(sk,
                              (struct timeval __user*)argp);
            break;
      case SIOCGSTAMPNS:
            rc = -EINVAL;
            if (sk)
                  rc = compat_sock_get_timestampns(sk,
                              (struct timespec __user*)argp);
            break;
      case SIOCGIFADDR:
      case SIOCSIFADDR:
      case SIOCGIFDSTADDR:
      case SIOCSIFDSTADDR:
      case SIOCGIFBRDADDR:
      case SIOCSIFBRDADDR:
      case SIOCGIFNETMASK:
      case SIOCSIFNETMASK:
      case SIOCGIFMETRIC:
      case SIOCSIFMETRIC:
            rc = -EINVAL;
            break;
      case SIOCADDRT:
      case SIOCDELRT:
            rc = -EPERM;
            if (!capable(CAP_NET_ADMIN))
                  break;
            rc = x25_route_ioctl(cmd, argp);
            break;
      case SIOCX25GSUBSCRIP:
            rc = compat_x25_subscr_ioctl(cmd, argp);
            break;
      case SIOCX25SSUBSCRIP:
            rc = -EPERM;
            if (!capable(CAP_NET_ADMIN))
                  break;
            rc = compat_x25_subscr_ioctl(cmd, argp);
            break;
      case SIOCX25GFACILITIES:
      case SIOCX25SFACILITIES:
      case SIOCX25GDTEFACILITIES:
      case SIOCX25SDTEFACILITIES:
      case SIOCX25GCALLUSERDATA:
      case SIOCX25SCALLUSERDATA:
      case SIOCX25GCAUSEDIAG:
      case SIOCX25SCUDMATCHLEN:
      case SIOCX25CALLACCPTAPPRV:
      case SIOCX25SENDCALLACCPT:
            rc = x25_ioctl(sock, cmd, (unsigned long)argp);
            break;
      default:
            rc = -ENOIOCTLCMD;
            break;
      }
      return rc;
}
#endif

static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
      .family =   AF_X25,
      .owner =    THIS_MODULE,
      .release =  x25_release,
      .bind =           x25_bind,
      .connect =  x25_connect,
      .socketpair =     sock_no_socketpair,
      .accept =   x25_accept,
      .getname =  x25_getname,
      .poll =           datagram_poll,
      .ioctl =    x25_ioctl,
#ifdef CONFIG_COMPAT
      .compat_ioctl = compat_x25_ioctl,
#endif
      .listen =   x25_listen,
      .shutdown = sock_no_shutdown,
      .setsockopt =     x25_setsockopt,
      .getsockopt =     x25_getsockopt,
      .sendmsg =  x25_sendmsg,
      .recvmsg =  x25_recvmsg,
      .mmap =           sock_no_mmap,
      .sendpage = sock_no_sendpage,
};

SOCKOPS_WRAP(x25_proto, AF_X25);

static struct packet_type x25_packet_type = {
      .type =     __constant_htons(ETH_P_X25),
      .func =     x25_lapb_receive_frame,
};

static struct notifier_block x25_dev_notifier = {
      .notifier_call = x25_device_event,
};

void x25_kill_by_neigh(struct x25_neigh *nb)
{
      struct sock *s;
      struct hlist_node *node;

      write_lock_bh(&x25_list_lock);

      sk_for_each(s, node, &x25_list)
            if (x25_sk(s)->neighbour == nb)
                  x25_disconnect(s, ENETUNREACH, 0, 0);

      write_unlock_bh(&x25_list_lock);

      /* Remove any related forwards */
      x25_clear_forward_by_dev(nb->dev);
}

static int __init x25_init(void)
{
      int rc = proto_register(&x25_proto, 0);

      if (rc != 0)
            goto out;

      sock_register(&x25_family_ops);

      dev_add_pack(&x25_packet_type);

      register_netdevice_notifier(&x25_dev_notifier);

      printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");

#ifdef CONFIG_SYSCTL
      x25_register_sysctl();
#endif
      x25_proc_init();
out:
      return rc;
}
module_init(x25_init);

static void __exit x25_exit(void)
{
      x25_proc_exit();
      x25_link_free();
      x25_route_free();

#ifdef CONFIG_SYSCTL
      x25_unregister_sysctl();
#endif

      unregister_netdevice_notifier(&x25_dev_notifier);

      dev_remove_pack(&x25_packet_type);

      sock_unregister(AF_X25);
      proto_unregister(&x25_proto);
}
module_exit(x25_exit);

MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_X25);

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