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af_ipx.c

/*
 *    Implements an IPX socket layer.
 *
 *    This code is derived from work by
 *          Ross Biro   :     Writing the original IP stack
 *          Fred Van Kempen : Tidying up the TCP/IP
 *
 *    Many thanks go to Keith Baker, Institute For Industrial Information
 *    Technology Ltd, Swansea University for allowing me to work on this
 *    in my own time even though it was in some ways related to commercial
 *    work I am currently employed to do there.
 *
 *    All the material in this file is subject to the Gnu license version 2.
 *    Neither Alan Cox nor the Swansea University Computer Society admit
 *    liability nor provide warranty for any of this software. This material
 *    is provided as is and at no charge.
 *
 *    Portions Copyright (c) 2000-2003 Conectiva, Inc. <acme@conectiva.com.br>
 *    Neither Arnaldo Carvalho de Melo nor Conectiva, Inc. admit liability nor
 *    provide warranty for any of this software. This material is provided
 *    "AS-IS" and at no charge.
 *
 *    Portions Copyright (c) 1995 Caldera, Inc. <greg@caldera.com>
 *    Neither Greg Page nor Caldera, Inc. admit liability nor provide
 *    warranty for any of this software. This material is provided
 *    "AS-IS" and at no charge.
 *
 *    See net/ipx/ChangeLog.
 */

#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/ipx.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/uio.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/termios.h>

#include <net/ipx.h>
#include <net/p8022.h>
#include <net/psnap.h>
#include <net/sock.h>
#include <net/tcp_states.h>

#include <asm/uaccess.h>

#ifdef CONFIG_SYSCTL
extern void ipx_register_sysctl(void);
extern void ipx_unregister_sysctl(void);
#else
#define ipx_register_sysctl()
#define ipx_unregister_sysctl()
#endif

/* Configuration Variables */
static unsigned char ipxcfg_max_hops = 16;
static char ipxcfg_auto_select_primary;
static char ipxcfg_auto_create_interfaces;
int sysctl_ipx_pprop_broadcasting = 1;

/* Global Variables */
static struct datalink_proto *p8022_datalink;
static struct datalink_proto *pEII_datalink;
static struct datalink_proto *p8023_datalink;
static struct datalink_proto *pSNAP_datalink;

static const struct proto_ops ipx_dgram_ops;

LIST_HEAD(ipx_interfaces);
DEFINE_SPINLOCK(ipx_interfaces_lock);

struct ipx_interface *ipx_primary_net;
struct ipx_interface *ipx_internal_net;

extern int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
                      unsigned char *node);
extern void ipxrtr_del_routes(struct ipx_interface *intrfc);
extern int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx,
                         struct iovec *iov, size_t len, int noblock);
extern int ipxrtr_route_skb(struct sk_buff *skb);
extern struct ipx_route *ipxrtr_lookup(__be32 net);
extern int ipxrtr_ioctl(unsigned int cmd, void __user *arg);

struct ipx_interface *ipx_interfaces_head(void)
{
      struct ipx_interface *rc = NULL;

      if (!list_empty(&ipx_interfaces))
            rc = list_entry(ipx_interfaces.next,
                        struct ipx_interface, node);
      return rc;
}

static void ipxcfg_set_auto_select(char val)
{
      ipxcfg_auto_select_primary = val;
      if (val && !ipx_primary_net)
            ipx_primary_net = ipx_interfaces_head();
}

static int ipxcfg_get_config_data(struct ipx_config_data __user *arg)
{
      struct ipx_config_data vals;

      vals.ipxcfg_auto_create_interfaces = ipxcfg_auto_create_interfaces;
      vals.ipxcfg_auto_select_primary        = ipxcfg_auto_select_primary;

      return copy_to_user(arg, &vals, sizeof(vals)) ? -EFAULT : 0;
}

/*
 * Note: Sockets may not be removed _during_ an interrupt or inet_bh
 * handler using this technique. They can be added although we do not
 * use this facility.
 */

static void ipx_remove_socket(struct sock *sk)
{
      /* Determine interface with which socket is associated */
      struct ipx_interface *intrfc = ipx_sk(sk)->intrfc;

      if (!intrfc)
            goto out;

      ipxitf_hold(intrfc);
      spin_lock_bh(&intrfc->if_sklist_lock);
      sk_del_node_init(sk);
      spin_unlock_bh(&intrfc->if_sklist_lock);
      ipxitf_put(intrfc);
out:
      return;
}

static void ipx_destroy_socket(struct sock *sk)
{
      ipx_remove_socket(sk);
      skb_queue_purge(&sk->sk_receive_queue);
      sk_refcnt_debug_dec(sk);
      sock_put(sk);
}

/*
 * The following code is used to support IPX Interfaces (IPXITF).  An
 * IPX interface is defined by a physical device and a frame type.
 */

/* ipxitf_clear_primary_net has to be called with ipx_interfaces_lock held */

static void ipxitf_clear_primary_net(void)
{
      ipx_primary_net = NULL;
      if (ipxcfg_auto_select_primary)
            ipx_primary_net = ipx_interfaces_head();
}

static struct ipx_interface *__ipxitf_find_using_phys(struct net_device *dev,
                                          __be16 datalink)
{
      struct ipx_interface *i;

      list_for_each_entry(i, &ipx_interfaces, node)
            if (i->if_dev == dev && i->if_dlink_type == datalink)
                  goto out;
      i = NULL;
out:
      return i;
}

static struct ipx_interface *ipxitf_find_using_phys(struct net_device *dev,
                                        __be16 datalink)
{
      struct ipx_interface *i;

      spin_lock_bh(&ipx_interfaces_lock);
      i = __ipxitf_find_using_phys(dev, datalink);
      if (i)
            ipxitf_hold(i);
      spin_unlock_bh(&ipx_interfaces_lock);
      return i;
}

struct ipx_interface *ipxitf_find_using_net(__be32 net)
{
      struct ipx_interface *i;

      spin_lock_bh(&ipx_interfaces_lock);
      if (net) {
            list_for_each_entry(i, &ipx_interfaces, node)
                  if (i->if_netnum == net)
                        goto hold;
            i = NULL;
            goto unlock;
      }

      i = ipx_primary_net;
      if (i)
hold:
            ipxitf_hold(i);
unlock:
      spin_unlock_bh(&ipx_interfaces_lock);
      return i;
}

/* Sockets are bound to a particular IPX interface. */
static void ipxitf_insert_socket(struct ipx_interface *intrfc, struct sock *sk)
{
      ipxitf_hold(intrfc);
      spin_lock_bh(&intrfc->if_sklist_lock);
      ipx_sk(sk)->intrfc = intrfc;
      sk_add_node(sk, &intrfc->if_sklist);
      spin_unlock_bh(&intrfc->if_sklist_lock);
      ipxitf_put(intrfc);
}

/* caller must hold intrfc->if_sklist_lock */
static struct sock *__ipxitf_find_socket(struct ipx_interface *intrfc,
                               __be16 port)
{
      struct sock *s;
      struct hlist_node *node;

      sk_for_each(s, node, &intrfc->if_sklist)
            if (ipx_sk(s)->port == port)
                  goto found;
      s = NULL;
found:
      return s;
}

/* caller must hold a reference to intrfc */
static struct sock *ipxitf_find_socket(struct ipx_interface *intrfc,
                              __be16 port)
{
      struct sock *s;

      spin_lock_bh(&intrfc->if_sklist_lock);
      s = __ipxitf_find_socket(intrfc, port);
      if (s)
            sock_hold(s);
      spin_unlock_bh(&intrfc->if_sklist_lock);

      return s;
}

#ifdef CONFIG_IPX_INTERN
static struct sock *ipxitf_find_internal_socket(struct ipx_interface *intrfc,
                                    unsigned char *ipx_node,
                                    __be16 port)
{
      struct sock *s;
      struct hlist_node *node;

      ipxitf_hold(intrfc);
      spin_lock_bh(&intrfc->if_sklist_lock);

      sk_for_each(s, node, &intrfc->if_sklist) {
            struct ipx_sock *ipxs = ipx_sk(s);

            if (ipxs->port == port &&
                !memcmp(ipx_node, ipxs->node, IPX_NODE_LEN))
                  goto found;
      }
      s = NULL;
found:
      spin_unlock_bh(&intrfc->if_sklist_lock);
      ipxitf_put(intrfc);
      return s;
}
#endif

static void __ipxitf_down(struct ipx_interface *intrfc)
{
      struct sock *s;
      struct hlist_node *node, *t;

      /* Delete all routes associated with this interface */
      ipxrtr_del_routes(intrfc);

      spin_lock_bh(&intrfc->if_sklist_lock);
      /* error sockets */
      sk_for_each_safe(s, node, t, &intrfc->if_sklist) {
            struct ipx_sock *ipxs = ipx_sk(s);

            s->sk_err = ENOLINK;
            s->sk_error_report(s);
            ipxs->intrfc = NULL;
            ipxs->port   = 0;
            sock_set_flag(s, SOCK_ZAPPED); /* Indicates it is no longer bound */
            sk_del_node_init(s);
      }
      INIT_HLIST_HEAD(&intrfc->if_sklist);
      spin_unlock_bh(&intrfc->if_sklist_lock);

      /* remove this interface from list */
      list_del(&intrfc->node);

      /* remove this interface from *special* networks */
      if (intrfc == ipx_primary_net)
            ipxitf_clear_primary_net();
      if (intrfc == ipx_internal_net)
            ipx_internal_net = NULL;

      if (intrfc->if_dev)
            dev_put(intrfc->if_dev);
      kfree(intrfc);
}

void ipxitf_down(struct ipx_interface *intrfc)
{
      spin_lock_bh(&ipx_interfaces_lock);
      __ipxitf_down(intrfc);
      spin_unlock_bh(&ipx_interfaces_lock);
}

static __inline__ void __ipxitf_put(struct ipx_interface *intrfc)
{
      if (atomic_dec_and_test(&intrfc->refcnt))
            __ipxitf_down(intrfc);
}

static int ipxitf_device_event(struct notifier_block *notifier,
                        unsigned long event, void *ptr)
{
      struct net_device *dev = ptr;
      struct ipx_interface *i, *tmp;

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

      if (event != NETDEV_DOWN && event != NETDEV_UP)
            goto out;

      spin_lock_bh(&ipx_interfaces_lock);
      list_for_each_entry_safe(i, tmp, &ipx_interfaces, node)
            if (i->if_dev == dev) {
                  if (event == NETDEV_UP)
                        ipxitf_hold(i);
                  else
                        __ipxitf_put(i);
            }
      spin_unlock_bh(&ipx_interfaces_lock);
out:
      return NOTIFY_DONE;
}


static __exit void ipxitf_cleanup(void)
{
      struct ipx_interface *i, *tmp;

      spin_lock_bh(&ipx_interfaces_lock);
      list_for_each_entry_safe(i, tmp, &ipx_interfaces, node)
            __ipxitf_put(i);
      spin_unlock_bh(&ipx_interfaces_lock);
}

static void ipxitf_def_skb_handler(struct sock *sock, struct sk_buff *skb)
{
      if (sock_queue_rcv_skb(sock, skb) < 0)
            kfree_skb(skb);
}

/*
 * On input skb->sk is NULL. Nobody is charged for the memory.
 */

/* caller must hold a reference to intrfc */

#ifdef CONFIG_IPX_INTERN
static int ipxitf_demux_socket(struct ipx_interface *intrfc,
                         struct sk_buff *skb, int copy)
{
      struct ipxhdr *ipx = ipx_hdr(skb);
      int is_broadcast = !memcmp(ipx->ipx_dest.node, ipx_broadcast_node,
                           IPX_NODE_LEN);
      struct sock *s;
      struct hlist_node *node;
      int rc;

      spin_lock_bh(&intrfc->if_sklist_lock);

      sk_for_each(s, node, &intrfc->if_sklist) {
            struct ipx_sock *ipxs = ipx_sk(s);

            if (ipxs->port == ipx->ipx_dest.sock &&
                (is_broadcast || !memcmp(ipx->ipx_dest.node,
                                   ipxs->node, IPX_NODE_LEN))) {
                  /* We found a socket to which to send */
                  struct sk_buff *skb1;

                  if (copy) {
                        skb1 = skb_clone(skb, GFP_ATOMIC);
                        rc = -ENOMEM;
                        if (!skb1)
                              goto out;
                  } else {
                        skb1 = skb;
                        copy = 1; /* skb may only be used once */
                  }
                  ipxitf_def_skb_handler(s, skb1);

                  /* On an external interface, one socket can listen */
                  if (intrfc != ipx_internal_net)
                        break;
            }
      }

      /* skb was solely for us, and we did not make a copy, so free it. */
      if (!copy)
            kfree_skb(skb);

      rc = 0;
out:
      spin_unlock_bh(&intrfc->if_sklist_lock);
      return rc;
}
#else
static struct sock *ncp_connection_hack(struct ipx_interface *intrfc,
                              struct ipxhdr *ipx)
{
      /* The packet's target is a NCP connection handler. We want to hand it
       * to the correct socket directly within the kernel, so that the
       * mars_nwe packet distribution process does not have to do it. Here we
       * only care about NCP and BURST packets.
       *
       * You might call this a hack, but believe me, you do not want a
       * complete NCP layer in the kernel, and this is VERY fast as well. */
      struct sock *sk = NULL;
      int connection = 0;
      u8 *ncphdr = (u8 *)(ipx + 1);

      if (*ncphdr == 0x22 && *(ncphdr + 1) == 0x22) /* NCP request */
            connection = (((int) *(ncphdr + 5)) << 8) | (int) *(ncphdr + 3);
      else if (*ncphdr == 0x77 && *(ncphdr + 1) == 0x77) /* BURST packet */
            connection = (((int) *(ncphdr + 9)) << 8) | (int) *(ncphdr + 8);

      if (connection) {
            struct hlist_node *node;
            /* Now we have to look for a special NCP connection handling
             * socket. Only these sockets have ipx_ncp_conn != 0, set by
             * SIOCIPXNCPCONN. */
            spin_lock_bh(&intrfc->if_sklist_lock);
            sk_for_each(sk, node, &intrfc->if_sklist)
                  if (ipx_sk(sk)->ipx_ncp_conn == connection) {
                        sock_hold(sk);
                        goto found;
                  }
            sk = NULL;
      found:
            spin_unlock_bh(&intrfc->if_sklist_lock);
      }
      return sk;
}

static int ipxitf_demux_socket(struct ipx_interface *intrfc,
                         struct sk_buff *skb, int copy)
{
      struct ipxhdr *ipx = ipx_hdr(skb);
      struct sock *sock1 = NULL, *sock2 = NULL;
      struct sk_buff *skb1 = NULL, *skb2 = NULL;
      int rc;

      if (intrfc == ipx_primary_net && ntohs(ipx->ipx_dest.sock) == 0x451)
            sock1 = ncp_connection_hack(intrfc, ipx);
      if (!sock1)
            /* No special socket found, forward the packet the normal way */
            sock1 = ipxitf_find_socket(intrfc, ipx->ipx_dest.sock);

      /*
       * We need to check if there is a primary net and if
       * this is addressed to one of the *SPECIAL* sockets because
       * these need to be propagated to the primary net.
       * The *SPECIAL* socket list contains: 0x452(SAP), 0x453(RIP) and
       * 0x456(Diagnostic).
       */

      if (ipx_primary_net && intrfc != ipx_primary_net) {
            const int dsock = ntohs(ipx->ipx_dest.sock);

            if (dsock == 0x452 || dsock == 0x453 || dsock == 0x456)
                  /* The appropriate thing to do here is to dup the
                   * packet and route to the primary net interface via
                   * ipxitf_send; however, we'll cheat and just demux it
                   * here. */
                  sock2 = ipxitf_find_socket(ipx_primary_net,
                                          ipx->ipx_dest.sock);
      }

      /*
       * If there is nothing to do return. The kfree will cancel any charging.
       */
      rc = 0;
      if (!sock1 && !sock2) {
            if (!copy)
                  kfree_skb(skb);
            goto out;
      }

      /*
       * This next segment of code is a little awkward, but it sets it up
       * so that the appropriate number of copies of the SKB are made and
       * that skb1 and skb2 point to it (them) so that it (they) can be
       * demuxed to sock1 and/or sock2.  If we are unable to make enough
       * copies, we do as much as is possible.
       */

      if (copy)
            skb1 = skb_clone(skb, GFP_ATOMIC);
      else
            skb1 = skb;

      rc = -ENOMEM;
      if (!skb1)
            goto out_put;

      /* Do we need 2 SKBs? */
      if (sock1 && sock2)
            skb2 = skb_clone(skb1, GFP_ATOMIC);
      else
            skb2 = skb1;

      if (sock1)
            ipxitf_def_skb_handler(sock1, skb1);

      if (!skb2)
            goto out_put;

      if (sock2)
            ipxitf_def_skb_handler(sock2, skb2);

      rc = 0;
out_put:
      if (sock1)
            sock_put(sock1);
      if (sock2)
            sock_put(sock2);
out:
      return rc;
}
#endif      /* CONFIG_IPX_INTERN */

static struct sk_buff *ipxitf_adjust_skbuff(struct ipx_interface *intrfc,
                                  struct sk_buff *skb)
{
      struct sk_buff *skb2;
      int in_offset = (unsigned char *)ipx_hdr(skb) - skb->head;
      int out_offset = intrfc->if_ipx_offset;
      int len;

      /* Hopefully, most cases */
      if (in_offset >= out_offset)
            return skb;

      /* Need new SKB */
      len  = skb->len + out_offset;
      skb2 = alloc_skb(len, GFP_ATOMIC);
      if (skb2) {
            skb_reserve(skb2, out_offset);
            skb_reset_network_header(skb2);
            skb_reset_transport_header(skb2);
            skb_put(skb2, skb->len);
            memcpy(ipx_hdr(skb2), ipx_hdr(skb), skb->len);
            memcpy(skb2->cb, skb->cb, sizeof(skb->cb));
      }
      kfree_skb(skb);
      return skb2;
}

/* caller must hold a reference to intrfc and the skb has to be unshared */
int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, char *node)
{
      struct ipxhdr *ipx = ipx_hdr(skb);
      struct net_device *dev = intrfc->if_dev;
      struct datalink_proto *dl = intrfc->if_dlink;
      char dest_node[IPX_NODE_LEN];
      int send_to_wire = 1;
      int addr_len;

      ipx->ipx_tctrl = IPX_SKB_CB(skb)->ipx_tctrl;
      ipx->ipx_dest.net = IPX_SKB_CB(skb)->ipx_dest_net;
      ipx->ipx_source.net = IPX_SKB_CB(skb)->ipx_source_net;

      /* see if we need to include the netnum in the route list */
      if (IPX_SKB_CB(skb)->last_hop.index >= 0) {
            __be32 *last_hop = (__be32 *)(((u8 *) skb->data) +
                        sizeof(struct ipxhdr) +
                        IPX_SKB_CB(skb)->last_hop.index *
                        sizeof(__be32));
            *last_hop = IPX_SKB_CB(skb)->last_hop.netnum;
            IPX_SKB_CB(skb)->last_hop.index = -1;
      }

      /*
       * We need to know how many skbuffs it will take to send out this
       * packet to avoid unnecessary copies.
       */

      if (!dl || !dev || dev->flags & IFF_LOOPBACK)
            send_to_wire = 0; /* No non looped */

      /*
       * See if this should be demuxed to sockets on this interface
       *
       * We want to ensure the original was eaten or that we only use
       * up clones.
       */

      if (ipx->ipx_dest.net == intrfc->if_netnum) {
            /*
             * To our own node, loop and free the original.
             * The internal net will receive on all node address.
             */
            if (intrfc == ipx_internal_net ||
                !memcmp(intrfc->if_node, node, IPX_NODE_LEN)) {
                  /* Don't charge sender */
                  skb_orphan(skb);

                  /* Will charge receiver */
                  return ipxitf_demux_socket(intrfc, skb, 0);
            }

            /* Broadcast, loop and possibly keep to send on. */
            if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN)) {
                  if (!send_to_wire)
                        skb_orphan(skb);
                  ipxitf_demux_socket(intrfc, skb, send_to_wire);
                  if (!send_to_wire)
                        goto out;
            }
      }

      /*
       * If the originating net is not equal to our net; this is routed
       * We are still charging the sender. Which is right - the driver
       * free will handle this fairly.
       */
      if (ipx->ipx_source.net != intrfc->if_netnum) {
            /*
             * Unshare the buffer before modifying the count in
             * case it's a flood or tcpdump
             */
            skb = skb_unshare(skb, GFP_ATOMIC);
            if (!skb)
                  goto out;
            if (++ipx->ipx_tctrl > ipxcfg_max_hops)
                  send_to_wire = 0;
      }

      if (!send_to_wire) {
            kfree_skb(skb);
            goto out;
      }

      /* Determine the appropriate hardware address */
      addr_len = dev->addr_len;
      if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN))
            memcpy(dest_node, dev->broadcast, addr_len);
      else
            memcpy(dest_node, &(node[IPX_NODE_LEN-addr_len]), addr_len);

      /* Make any compensation for differing physical/data link size */
      skb = ipxitf_adjust_skbuff(intrfc, skb);
      if (!skb)
            goto out;

      /* set up data link and physical headers */
      skb->dev    = dev;
      skb->protocol     = htons(ETH_P_IPX);

      /* Send it out */
      dl->request(dl, skb, dest_node);
out:
      return 0;
}

static int ipxitf_add_local_route(struct ipx_interface *intrfc)
{
      return ipxrtr_add_route(intrfc->if_netnum, intrfc, NULL);
}

static void ipxitf_discover_netnum(struct ipx_interface *intrfc,
                           struct sk_buff *skb);
static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb);

static int ipxitf_rcv(struct ipx_interface *intrfc, struct sk_buff *skb)
{
      struct ipxhdr *ipx = ipx_hdr(skb);
      int rc = 0;

      ipxitf_hold(intrfc);

      /* See if we should update our network number */
      if (!intrfc->if_netnum) /* net number of intrfc not known yet */
            ipxitf_discover_netnum(intrfc, skb);

      IPX_SKB_CB(skb)->last_hop.index = -1;
      if (ipx->ipx_type == IPX_TYPE_PPROP) {
            rc = ipxitf_pprop(intrfc, skb);
            if (rc)
                  goto out_free_skb;
      }

      /* local processing follows */
      if (!IPX_SKB_CB(skb)->ipx_dest_net)
            IPX_SKB_CB(skb)->ipx_dest_net = intrfc->if_netnum;
      if (!IPX_SKB_CB(skb)->ipx_source_net)
            IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum;

      /* it doesn't make sense to route a pprop packet, there's no meaning
       * in the ipx_dest_net for such packets */
      if (ipx->ipx_type != IPX_TYPE_PPROP &&
          intrfc->if_netnum != IPX_SKB_CB(skb)->ipx_dest_net) {
            /* We only route point-to-point packets. */
            if (skb->pkt_type == PACKET_HOST) {
                  skb = skb_unshare(skb, GFP_ATOMIC);
                  if (skb)
                        rc = ipxrtr_route_skb(skb);
                  goto out_intrfc;
            }

            goto out_free_skb;
      }

      /* see if we should keep it */
      if (!memcmp(ipx_broadcast_node, ipx->ipx_dest.node, IPX_NODE_LEN) ||
          !memcmp(intrfc->if_node, ipx->ipx_dest.node, IPX_NODE_LEN)) {
            rc = ipxitf_demux_socket(intrfc, skb, 0);
            goto out_intrfc;
      }

      /* we couldn't pawn it off so unload it */
out_free_skb:
      kfree_skb(skb);
out_intrfc:
      ipxitf_put(intrfc);
      return rc;
}

static void ipxitf_discover_netnum(struct ipx_interface *intrfc,
                           struct sk_buff *skb)
{
      const struct ipx_cb *cb = IPX_SKB_CB(skb);

      /* see if this is an intra packet: source_net == dest_net */
      if (cb->ipx_source_net == cb->ipx_dest_net && cb->ipx_source_net) {
            struct ipx_interface *i =
                        ipxitf_find_using_net(cb->ipx_source_net);
            /* NB: NetWare servers lie about their hop count so we
             * dropped the test based on it. This is the best way
             * to determine this is a 0 hop count packet. */
            if (!i) {
                  intrfc->if_netnum = cb->ipx_source_net;
                  ipxitf_add_local_route(intrfc);
            } else {
                  printk(KERN_WARNING "IPX: Network number collision "
                        "%lx\n        %s %s and %s %s\n",
                        (unsigned long) ntohl(cb->ipx_source_net),
                        ipx_device_name(i),
                        ipx_frame_name(i->if_dlink_type),
                        ipx_device_name(intrfc),
                        ipx_frame_name(intrfc->if_dlink_type));
                  ipxitf_put(i);
            }
      }
}

/**
 * ipxitf_pprop - Process packet propagation IPX packet type 0x14, used for
 *            NetBIOS broadcasts
 * @intrfc: IPX interface receiving this packet
 * @skb: Received packet
 *
 * Checks if packet is valid: if its more than %IPX_MAX_PPROP_HOPS hops or if it
 * is smaller than a IPX header + the room for %IPX_MAX_PPROP_HOPS hops we drop
 * it, not even processing it locally, if it has exact %IPX_MAX_PPROP_HOPS we
 * don't broadcast it, but process it locally. See chapter 5 of Novell's "IPX
 * RIP and SAP Router Specification", Part Number 107-000029-001.
 *
 * If it is valid, check if we have pprop broadcasting enabled by the user,
 * if not, just return zero for local processing.
 *
 * If it is enabled check the packet and don't broadcast it if we have already
 * seen this packet.
 *
 * Broadcast: send it to the interfaces that aren't on the packet visited nets
 * array, just after the IPX header.
 *
 * Returns -EINVAL for invalid packets, so that the calling function drops
 * the packet without local processing. 0 if packet is to be locally processed.
 */
static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb)
{
      struct ipxhdr *ipx = ipx_hdr(skb);
      int i, rc = -EINVAL;
      struct ipx_interface *ifcs;
      char *c;
      __be32 *l;

      /* Illegal packet - too many hops or too short */
      /* We decide to throw it away: no broadcasting, no local processing.
       * NetBIOS unaware implementations route them as normal packets -
       * tctrl <= 15, any data payload... */
      if (IPX_SKB_CB(skb)->ipx_tctrl > IPX_MAX_PPROP_HOPS ||
          ntohs(ipx->ipx_pktsize) < sizeof(struct ipxhdr) +
                              IPX_MAX_PPROP_HOPS * sizeof(u32))
            goto out;
      /* are we broadcasting this damn thing? */
      rc = 0;
      if (!sysctl_ipx_pprop_broadcasting)
            goto out;
      /* We do broadcast packet on the IPX_MAX_PPROP_HOPS hop, but we
       * process it locally. All previous hops broadcasted it, and process it
       * locally. */
      if (IPX_SKB_CB(skb)->ipx_tctrl == IPX_MAX_PPROP_HOPS)
            goto out;

      c = ((u8 *) ipx) + sizeof(struct ipxhdr);
      l = (__be32 *) c;

      /* Don't broadcast packet if already seen this net */
      for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
            if (*l++ == intrfc->if_netnum)
                  goto out;

      /* < IPX_MAX_PPROP_HOPS hops && input interface not in list. Save the
       * position where we will insert recvd netnum into list, later on,
       * in ipxitf_send */
      IPX_SKB_CB(skb)->last_hop.index = i;
      IPX_SKB_CB(skb)->last_hop.netnum = intrfc->if_netnum;
      /* xmit on all other interfaces... */
      spin_lock_bh(&ipx_interfaces_lock);
      list_for_each_entry(ifcs, &ipx_interfaces, node) {
            /* Except unconfigured interfaces */
            if (!ifcs->if_netnum)
                  continue;

            /* That aren't in the list */
            if (ifcs == intrfc)
                  continue;
            l = (__be32 *) c;
            /* don't consider the last entry in the packet list,
             * it is our netnum, and it is not there yet */
            for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
                  if (ifcs->if_netnum == *l++)
                        break;
            if (i == IPX_SKB_CB(skb)->ipx_tctrl) {
                  struct sk_buff *s = skb_copy(skb, GFP_ATOMIC);

                  if (s) {
                        IPX_SKB_CB(s)->ipx_dest_net = ifcs->if_netnum;
                        ipxrtr_route_skb(s);
                  }
            }
      }
      spin_unlock_bh(&ipx_interfaces_lock);
out:
      return rc;
}

static void ipxitf_insert(struct ipx_interface *intrfc)
{
      spin_lock_bh(&ipx_interfaces_lock);
      list_add_tail(&intrfc->node, &ipx_interfaces);
      spin_unlock_bh(&ipx_interfaces_lock);

      if (ipxcfg_auto_select_primary && !ipx_primary_net)
            ipx_primary_net = intrfc;
}

static struct ipx_interface *ipxitf_alloc(struct net_device *dev, __be32 netnum,
                                __be16 dlink_type,
                                struct datalink_proto *dlink,
                                unsigned char internal,
                                int ipx_offset)
{
      struct ipx_interface *intrfc = kmalloc(sizeof(*intrfc), GFP_ATOMIC);

      if (intrfc) {
            intrfc->if_dev          = dev;
            intrfc->if_netnum = netnum;
            intrfc->if_dlink_type   = dlink_type;
            intrfc->if_dlink  = dlink;
            intrfc->if_internal     = internal;
            intrfc->if_ipx_offset   = ipx_offset;
            intrfc->if_sknum  = IPX_MIN_EPHEMERAL_SOCKET;
            INIT_HLIST_HEAD(&intrfc->if_sklist);
            atomic_set(&intrfc->refcnt, 1);
            spin_lock_init(&intrfc->if_sklist_lock);
      }

      return intrfc;
}

static int ipxitf_create_internal(struct ipx_interface_definition *idef)
{
      struct ipx_interface *intrfc;
      int rc = -EEXIST;

      /* Only one primary network allowed */
      if (ipx_primary_net)
            goto out;

      /* Must have a valid network number */
      rc = -EADDRNOTAVAIL;
      if (!idef->ipx_network)
            goto out;
      intrfc = ipxitf_find_using_net(idef->ipx_network);
      rc = -EADDRINUSE;
      if (intrfc) {
            ipxitf_put(intrfc);
            goto out;
      }
      intrfc = ipxitf_alloc(NULL, idef->ipx_network, 0, NULL, 1, 0);
      rc = -EAGAIN;
      if (!intrfc)
            goto out;
      memcpy((char *)&(intrfc->if_node), idef->ipx_node, IPX_NODE_LEN);
      ipx_internal_net = ipx_primary_net = intrfc;
      ipxitf_hold(intrfc);
      ipxitf_insert(intrfc);

      rc = ipxitf_add_local_route(intrfc);
      ipxitf_put(intrfc);
out:
      return rc;
}

static __be16 ipx_map_frame_type(unsigned char type)
{
      __be16 rc = 0;

      switch (type) {
      case IPX_FRAME_ETHERII: rc = htons(ETH_P_IPX);        break;
      case IPX_FRAME_8022:    rc = htons(ETH_P_802_2);      break;
      case IPX_FRAME_SNAP:    rc = htons(ETH_P_SNAP);       break;
      case IPX_FRAME_8023:    rc = htons(ETH_P_802_3);      break;
      }

      return rc;
}

static int ipxitf_create(struct ipx_interface_definition *idef)
{
      struct net_device *dev;
      __be16 dlink_type = 0;
      struct datalink_proto *datalink = NULL;
      struct ipx_interface *intrfc;
      int rc;

      if (idef->ipx_special == IPX_INTERNAL) {
            rc = ipxitf_create_internal(idef);
            goto out;
      }

      rc = -EEXIST;
      if (idef->ipx_special == IPX_PRIMARY && ipx_primary_net)
            goto out;

      intrfc = ipxitf_find_using_net(idef->ipx_network);
      rc = -EADDRINUSE;
      if (idef->ipx_network && intrfc) {
            ipxitf_put(intrfc);
            goto out;
      }

      if (intrfc)
            ipxitf_put(intrfc);

      dev = dev_get_by_name(&init_net, idef->ipx_device);
      rc = -ENODEV;
      if (!dev)
            goto out;

      switch (idef->ipx_dlink_type) {
      case IPX_FRAME_TR_8022:
            printk(KERN_WARNING "IPX frame type 802.2TR is "
                  "obsolete Use 802.2 instead.\n");
            /* fall through */
      case IPX_FRAME_8022:
            dlink_type  = htons(ETH_P_802_2);
            datalink    = p8022_datalink;
            break;
      case IPX_FRAME_ETHERII:
            if (dev->type != ARPHRD_IEEE802) {
                  dlink_type  = htons(ETH_P_IPX);
                  datalink    = pEII_datalink;
                  break;
            } else
                  printk(KERN_WARNING "IPX frame type EtherII over "
                              "token-ring is obsolete. Use SNAP "
                              "instead.\n");
            /* fall through */
      case IPX_FRAME_SNAP:
            dlink_type  = htons(ETH_P_SNAP);
            datalink    = pSNAP_datalink;
            break;
      case IPX_FRAME_8023:
            dlink_type  = htons(ETH_P_802_3);
            datalink    = p8023_datalink;
            break;
      case IPX_FRAME_NONE:
      default:
            rc = -EPROTONOSUPPORT;
            goto out_dev;
      }

      rc = -ENETDOWN;
      if (!(dev->flags & IFF_UP))
            goto out_dev;

      /* Check addresses are suitable */
      rc = -EINVAL;
      if (dev->addr_len > IPX_NODE_LEN)
            goto out_dev;

      intrfc = ipxitf_find_using_phys(dev, dlink_type);
      if (!intrfc) {
            /* Ok now create */
            intrfc = ipxitf_alloc(dev, idef->ipx_network, dlink_type,
                              datalink, 0, dev->hard_header_len +
                              datalink->header_length);
            rc = -EAGAIN;
            if (!intrfc)
                  goto out_dev;
            /* Setup primary if necessary */
            if (idef->ipx_special == IPX_PRIMARY)
                  ipx_primary_net = intrfc;
            if (!memcmp(idef->ipx_node, "\000\000\000\000\000\000",
                      IPX_NODE_LEN)) {
                  memset(intrfc->if_node, 0, IPX_NODE_LEN);
                  memcpy(intrfc->if_node + IPX_NODE_LEN - dev->addr_len,
                        dev->dev_addr, dev->addr_len);
            } else
                  memcpy(intrfc->if_node, idef->ipx_node, IPX_NODE_LEN);
            ipxitf_hold(intrfc);
            ipxitf_insert(intrfc);
      }


      /* If the network number is known, add a route */
      rc = 0;
      if (!intrfc->if_netnum)
            goto out_intrfc;

      rc = ipxitf_add_local_route(intrfc);
out_intrfc:
      ipxitf_put(intrfc);
      goto out;
out_dev:
      dev_put(dev);
out:
      return rc;
}

static int ipxitf_delete(struct ipx_interface_definition *idef)
{
      struct net_device *dev = NULL;
      __be16 dlink_type = 0;
      struct ipx_interface *intrfc;
      int rc = 0;

      spin_lock_bh(&ipx_interfaces_lock);
      if (idef->ipx_special == IPX_INTERNAL) {
            if (ipx_internal_net) {
                  __ipxitf_put(ipx_internal_net);
                  goto out;
            }
            rc = -ENOENT;
            goto out;
      }

      dlink_type = ipx_map_frame_type(idef->ipx_dlink_type);
      rc = -EPROTONOSUPPORT;
      if (!dlink_type)
            goto out;

      dev = __dev_get_by_name(&init_net, idef->ipx_device);
      rc = -ENODEV;
      if (!dev)
            goto out;

      intrfc = __ipxitf_find_using_phys(dev, dlink_type);
      rc = -EINVAL;
      if (!intrfc)
            goto out;
      __ipxitf_put(intrfc);

      rc = 0;
out:
      spin_unlock_bh(&ipx_interfaces_lock);
      return rc;
}

static struct ipx_interface *ipxitf_auto_create(struct net_device *dev,
                                    __be16 dlink_type)
{
      struct ipx_interface *intrfc = NULL;
      struct datalink_proto *datalink;

      if (!dev)
            goto out;

      /* Check addresses are suitable */
      if (dev->addr_len > IPX_NODE_LEN)
            goto out;

      switch (ntohs(dlink_type)) {
      case ETH_P_IPX:         datalink = pEII_datalink;     break;
      case ETH_P_802_2: datalink = p8022_datalink;    break;
      case ETH_P_SNAP:  datalink = pSNAP_datalink;    break;
      case ETH_P_802_3: datalink = p8023_datalink;    break;
      default:          goto out;
      }

      intrfc = ipxitf_alloc(dev, 0, dlink_type, datalink, 0,
                        dev->hard_header_len + datalink->header_length);

      if (intrfc) {
            memset(intrfc->if_node, 0, IPX_NODE_LEN);
            memcpy((char *)&(intrfc->if_node[IPX_NODE_LEN-dev->addr_len]),
                  dev->dev_addr, dev->addr_len);
            spin_lock_init(&intrfc->if_sklist_lock);
            atomic_set(&intrfc->refcnt, 1);
            ipxitf_insert(intrfc);
            dev_hold(dev);
      }

out:
      return intrfc;
}

static int ipxitf_ioctl(unsigned int cmd, void __user *arg)
{
      int rc = -EINVAL;
      struct ifreq ifr;
      int val;

      switch (cmd) {
      case SIOCSIFADDR: {
            struct sockaddr_ipx *sipx;
            struct ipx_interface_definition f;

            rc = -EFAULT;
            if (copy_from_user(&ifr, arg, sizeof(ifr)))
                  break;
            sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
            rc = -EINVAL;
            if (sipx->sipx_family != AF_IPX)
                  break;
            f.ipx_network = sipx->sipx_network;
            memcpy(f.ipx_device, ifr.ifr_name,
                  sizeof(f.ipx_device));
            memcpy(f.ipx_node, sipx->sipx_node, IPX_NODE_LEN);
            f.ipx_dlink_type = sipx->sipx_type;
            f.ipx_special = sipx->sipx_special;

            if (sipx->sipx_action == IPX_DLTITF)
                  rc = ipxitf_delete(&f);
            else
                  rc = ipxitf_create(&f);
            break;
      }
      case SIOCGIFADDR: {
            struct sockaddr_ipx *sipx;
            struct ipx_interface *ipxif;
            struct net_device *dev;

            rc = -EFAULT;
            if (copy_from_user(&ifr, arg, sizeof(ifr)))
                  break;
            sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
            dev  = __dev_get_by_name(&init_net, ifr.ifr_name);
            rc   = -ENODEV;
            if (!dev)
                  break;
            ipxif = ipxitf_find_using_phys(dev,
                                 ipx_map_frame_type(sipx->sipx_type));
            rc = -EADDRNOTAVAIL;
            if (!ipxif)
                  break;

            sipx->sipx_family = AF_IPX;
            sipx->sipx_network      = ipxif->if_netnum;
            memcpy(sipx->sipx_node, ipxif->if_node,
                  sizeof(sipx->sipx_node));
            rc = -EFAULT;
            if (copy_to_user(arg, &ifr, sizeof(ifr)))
                  break;
            ipxitf_put(ipxif);
            rc = 0;
            break;
      }
      case SIOCAIPXITFCRT:
            rc = -EFAULT;
            if (get_user(val, (unsigned char __user *) arg))
                  break;
            rc = 0;
            ipxcfg_auto_create_interfaces = val;
            break;
      case SIOCAIPXPRISLT:
            rc = -EFAULT;
            if (get_user(val, (unsigned char __user *) arg))
                  break;
            rc = 0;
            ipxcfg_set_auto_select(val);
            break;
      }

      return rc;
}

/*
 *    Checksum routine for IPX
 */

/* Note: We assume ipx_tctrl==0 and htons(length)==ipx_pktsize */
/* This functions should *not* mess with packet contents */

__be16 ipx_cksum(struct ipxhdr *packet, int length)
{
      /*
       *    NOTE: sum is a net byte order quantity, which optimizes the
       *    loop. This only works on big and little endian machines. (I
       *    don't know of a machine that isn't.)
       */
      /* handle the first 3 words separately; checksum should be skipped
       * and ipx_tctrl masked out */
      __u16 *p = (__u16 *)packet;
      __u32 sum = p[1] + (p[2] & (__force u16)htons(0x00ff));
      __u32 i = (length >> 1) - 3; /* Number of remaining complete words */

      /* Loop through them */
      p += 3;
      while (i--)
            sum += *p++;

      /* Add on the last part word if it exists */
      if (packet->ipx_pktsize & htons(1))
            sum += (__force u16)htons(0xff00) & *p;

      /* Do final fixup */
      sum = (sum & 0xffff) + (sum >> 16);

      /* It's a pity there's no concept of carry in C */
      if (sum >= 0x10000)
            sum++;

      /*
       * Leave 0 alone; we don't want 0xffff here.  Note that we can't get
       * here with 0x10000, so this check is the same as ((__u16)sum)
       */
      if (sum)
            sum = ~sum;

      return (__force __be16)sum;
}

const char *ipx_frame_name(__be16 frame)
{
      char* rc = "None";

      switch (ntohs(frame)) {
      case ETH_P_IPX:         rc = "EtherII";   break;
      case ETH_P_802_2: rc = "802.2";     break;
      case ETH_P_SNAP:  rc = "SNAP";      break;
      case ETH_P_802_3: rc = "802.3";     break;
      case ETH_P_TR_802_2:    rc = "802.2TR";   break;
      }

      return rc;
}

const char *ipx_device_name(struct ipx_interface *intrfc)
{
      return intrfc->if_internal ? "Internal" :
            intrfc->if_dev ? intrfc->if_dev->name : "Unknown";
}

/* Handling for system calls applied via the various interfaces to an IPX
 * socket object. */

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

      if (optlen != sizeof(int))
            goto out;

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

      rc = -ENOPROTOOPT;
      if (!(level == SOL_IPX && optname == IPX_TYPE))
            goto out;

      ipx_sk(sk)->type = opt;
      rc = 0;
out:
      return rc;
}

static int ipx_getsockopt(struct socket *sock, int level, int optname,
      char __user *optval, int __user *optlen)
{
      struct sock *sk = sock->sk;
      int val = 0;
      int len;
      int rc = -ENOPROTOOPT;

      if (!(level == SOL_IPX && optname == IPX_TYPE))
            goto out;

      val = ipx_sk(sk)->type;

      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) || copy_to_user(optval, &val, len))
            goto out;

      rc = 0;
out:
      return rc;
}

static struct proto ipx_proto = {
      .name   = "IPX",
      .owner        = THIS_MODULE,
      .obj_size = sizeof(struct ipx_sock),
};

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

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

      /*
       * SPX support is not anymore in the kernel sources. If you want to
       * ressurrect it, completing it and making it understand shared skbs,
       * be fully multithreaded, etc, grab the sources in an early 2.5 kernel
       * tree.
       */
      if (sock->type != SOCK_DGRAM)
            goto out;

      rc = -ENOMEM;
      sk = sk_alloc(net, PF_IPX, GFP_KERNEL, &ipx_proto);
      if (!sk)
            goto out;

      sk_refcnt_debug_inc(sk);
      sock_init_data(sock, sk);
      sk->sk_no_check = 1;          /* Checksum off by default */
      sock->ops = &ipx_dgram_ops;
      rc = 0;
out:
      return rc;
}

static int ipx_release(struct socket *sock)
{
      struct sock *sk = sock->sk;

      if (!sk)
            goto out;

      if (!sock_flag(sk, SOCK_DEAD))
            sk->sk_state_change(sk);

      sock_set_flag(sk, SOCK_DEAD);
      sock->sk = NULL;
      sk_refcnt_debug_release(sk);
      ipx_destroy_socket(sk);
out:
      return 0;
}

/* caller must hold a reference to intrfc */

static __be16 ipx_first_free_socketnum(struct ipx_interface *intrfc)
{
      unsigned short socketNum = intrfc->if_sknum;

      spin_lock_bh(&intrfc->if_sklist_lock);

      if (socketNum < IPX_MIN_EPHEMERAL_SOCKET)
            socketNum = IPX_MIN_EPHEMERAL_SOCKET;

      while (__ipxitf_find_socket(intrfc, htons(socketNum)))
            if (socketNum > IPX_MAX_EPHEMERAL_SOCKET)
                  socketNum = IPX_MIN_EPHEMERAL_SOCKET;
            else
                  socketNum++;

      spin_unlock_bh(&intrfc->if_sklist_lock);
      intrfc->if_sknum = socketNum;

      return htons(socketNum);
}

static int ipx_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
      struct sock *sk = sock->sk;
      struct ipx_sock *ipxs = ipx_sk(sk);
      struct ipx_interface *intrfc;
      struct sockaddr_ipx *addr = (struct sockaddr_ipx *)uaddr;
      int rc = -EINVAL;

      if (!sock_flag(sk, SOCK_ZAPPED) || addr_len != sizeof(struct sockaddr_ipx))
            goto out;

      intrfc = ipxitf_find_using_net(addr->sipx_network);
      rc = -EADDRNOTAVAIL;
      if (!intrfc)
            goto out;

      if (!addr->sipx_port) {
            addr->sipx_port = ipx_first_free_socketnum(intrfc);
            rc = -EINVAL;
            if (!addr->sipx_port)
                  goto out_put;
      }

      /* protect IPX system stuff like routing/sap */
      rc = -EACCES;
      if (ntohs(addr->sipx_port) < IPX_MIN_EPHEMERAL_SOCKET &&
          !capable(CAP_NET_ADMIN))
            goto out_put;

      ipxs->port = addr->sipx_port;

#ifdef CONFIG_IPX_INTERN
      if (intrfc == ipx_internal_net) {
            /* The source address is to be set explicitly if the
             * socket is to be bound on the internal network. If a
             * node number 0 was specified, the default is used.
             */

            rc = -EINVAL;
            if (!memcmp(addr->sipx_node, ipx_broadcast_node, IPX_NODE_LEN))
                  goto out_put;
            if (!memcmp(addr->sipx_node, ipx_this_node, IPX_NODE_LEN))
                  memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN);
            else
                  memcpy(ipxs->node, addr->sipx_node, IPX_NODE_LEN);

            rc = -EADDRINUSE;
            if (ipxitf_find_internal_socket(intrfc, ipxs->node,
                                    ipxs->port)) {
                  SOCK_DEBUG(sk,
                        "IPX: bind failed because port %X in use.\n",
                        ntohs(addr->sipx_port));
                  goto out_put;
            }
      } else {
            /* Source addresses are easy. It must be our
             * network:node pair for an interface routed to IPX
             * with the ipx routing ioctl()
             */

            memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN);

            rc = -EADDRINUSE;
            if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
                  SOCK_DEBUG(sk,
                        "IPX: bind failed because port %X in use.\n",
                        ntohs(addr->sipx_port));
                  goto out_put;
            }
      }

#else /* !def CONFIG_IPX_INTERN */

      /* Source addresses are easy. It must be our network:node pair for
         an interface routed to IPX with the ipx routing ioctl() */

      rc = -EADDRINUSE;
      if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
            SOCK_DEBUG(sk, "IPX: bind failed because port %X in use.\n",
                        ntohs((int)addr->sipx_port));
            goto out_put;
      }

#endif      /* CONFIG_IPX_INTERN */

      ipxitf_insert_socket(intrfc, sk);
      sock_reset_flag(sk, SOCK_ZAPPED);

      rc = 0;
out_put:
      ipxitf_put(intrfc);
out:
      return rc;
}

static int ipx_connect(struct socket *sock, struct sockaddr *uaddr,
      int addr_len, int flags)
{
      struct sock *sk = sock->sk;
      struct ipx_sock *ipxs = ipx_sk(sk);
      struct sockaddr_ipx *addr;
      int rc = -EINVAL;
      struct ipx_route *rt;

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

      if (addr_len != sizeof(*addr))
            goto out;
      addr = (struct sockaddr_ipx *)uaddr;

      /* put the autobinding in */
      if (!ipxs->port) {
            struct sockaddr_ipx uaddr;

            uaddr.sipx_port         = 0;
            uaddr.sipx_network      = 0;

#ifdef CONFIG_IPX_INTERN
            rc = -ENETDOWN;
            if (!ipxs->intrfc)
                  goto out; /* Someone zonked the iface */
            memcpy(uaddr.sipx_node, ipxs->intrfc->if_node,
                  IPX_NODE_LEN);
#endif      /* CONFIG_IPX_INTERN */

            rc = ipx_bind(sock, (struct sockaddr *)&uaddr,
                        sizeof(struct sockaddr_ipx));
            if (rc)
                  goto out;
      }

      /* We can either connect to primary network or somewhere
       * we can route to */
      rt = ipxrtr_lookup(addr->sipx_network);
      rc = -ENETUNREACH;
      if (!rt && !(!addr->sipx_network && ipx_primary_net))
            goto out;

      ipxs->dest_addr.net  = addr->sipx_network;
      ipxs->dest_addr.sock = addr->sipx_port;
      memcpy(ipxs->dest_addr.node, addr->sipx_node, IPX_NODE_LEN);
      ipxs->type = addr->sipx_type;

      if (sock->type == SOCK_DGRAM) {
            sock->state       = SS_CONNECTED;
            sk->sk_state      = TCP_ESTABLISHED;
      }

      if (rt)
            ipxrtr_put(rt);
      rc = 0;
out:
      return rc;
}


static int ipx_getname(struct socket *sock, struct sockaddr *uaddr,
                  int *uaddr_len, int peer)
{
      struct ipx_address *addr;
      struct sockaddr_ipx sipx;
      struct sock *sk = sock->sk;
      struct ipx_sock *ipxs = ipx_sk(sk);
      int rc;

      *uaddr_len = sizeof(struct sockaddr_ipx);

      if (peer) {
            rc = -ENOTCONN;
            if (sk->sk_state != TCP_ESTABLISHED)
                  goto out;

            addr = &ipxs->dest_addr;
            sipx.sipx_network = addr->net;
            sipx.sipx_port          = addr->sock;
            memcpy(sipx.sipx_node, addr->node, IPX_NODE_LEN);
      } else {
            if (ipxs->intrfc) {
                  sipx.sipx_network = ipxs->intrfc->if_netnum;
#ifdef CONFIG_IPX_INTERN
                  memcpy(sipx.sipx_node, ipxs->node, IPX_NODE_LEN);
#else
                  memcpy(sipx.sipx_node, ipxs->intrfc->if_node,
                        IPX_NODE_LEN);
#endif      /* CONFIG_IPX_INTERN */

            } else {
                  sipx.sipx_network = 0;
                  memset(sipx.sipx_node, '\0', IPX_NODE_LEN);
            }

            sipx.sipx_port = ipxs->port;
      }

      sipx.sipx_family = AF_IPX;
      sipx.sipx_type     = ipxs->type;
      sipx.sipx_zero     = 0;
      memcpy(uaddr, &sipx, sizeof(sipx));

      rc = 0;
out:
      return rc;
}

static int ipx_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
      /* NULL here for pt means the packet was looped back */
      struct ipx_interface *intrfc;
      struct ipxhdr *ipx;
      u16 ipx_pktsize;
      int rc = 0;

      if (dev->nd_net != &init_net)
            goto drop;

      /* Not ours */
      if (skb->pkt_type == PACKET_OTHERHOST)
            goto drop;

      if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
            goto out;

      if (!pskb_may_pull(skb, sizeof(struct ipxhdr)))
            goto drop;

      ipx_pktsize = ntohs(ipx_hdr(skb)->ipx_pktsize);

      /* Too small or invalid header? */
      if (ipx_pktsize < sizeof(struct ipxhdr) ||
          !pskb_may_pull(skb, ipx_pktsize))
            goto drop;

      ipx = ipx_hdr(skb);
      if (ipx->ipx_checksum != IPX_NO_CHECKSUM &&
         ipx->ipx_checksum != ipx_cksum(ipx, ipx_pktsize))
            goto drop;

      IPX_SKB_CB(skb)->ipx_tctrl    = ipx->ipx_tctrl;
      IPX_SKB_CB(skb)->ipx_dest_net = ipx->ipx_dest.net;
      IPX_SKB_CB(skb)->ipx_source_net = ipx->ipx_source.net;

      /* Determine what local ipx endpoint this is */
      intrfc = ipxitf_find_using_phys(dev, pt->type);
      if (!intrfc) {
            if (ipxcfg_auto_create_interfaces &&
               IPX_SKB_CB(skb)->ipx_dest_net) {
                  intrfc = ipxitf_auto_create(dev, pt->type);
                  if (intrfc)
                        ipxitf_hold(intrfc);
            }

            if (!intrfc)      /* Not one of ours */
                        /* or invalid packet for auto creation */
                  goto drop;
      }

      rc = ipxitf_rcv(intrfc, skb);
      ipxitf_put(intrfc);
      goto out;
drop:
      kfree_skb(skb);
out:
      return rc;
}

static int ipx_sendmsg(struct kiocb *iocb, struct socket *sock,
      struct msghdr *msg, size_t len)
{
      struct sock *sk = sock->sk;
      struct ipx_sock *ipxs = ipx_sk(sk);
      struct sockaddr_ipx *usipx = (struct sockaddr_ipx *)msg->msg_name;
      struct sockaddr_ipx local_sipx;
      int rc = -EINVAL;
      int flags = msg->msg_flags;

      /* Socket gets bound below anyway */
/*    if (sk->sk_zapped)
            return -EIO; */   /* Socket not bound */
      if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
            goto out;

      /* Max possible packet size limited by 16 bit pktsize in header */
      if (len >= 65535 - sizeof(struct ipxhdr))
            goto out;

      if (usipx) {
            if (!ipxs->port) {
                  struct sockaddr_ipx uaddr;

                  uaddr.sipx_port         = 0;
                  uaddr.sipx_network      = 0;
#ifdef CONFIG_IPX_INTERN
                  rc = -ENETDOWN;
                  if (!ipxs->intrfc)
                        goto out; /* Someone zonked the iface */
                  memcpy(uaddr.sipx_node, ipxs->intrfc->if_node,
                        IPX_NODE_LEN);
#endif
                  rc = ipx_bind(sock, (struct sockaddr *)&uaddr,
                              sizeof(struct sockaddr_ipx));
                  if (rc)
                        goto out;
            }

            rc = -EINVAL;
            if (msg->msg_namelen < sizeof(*usipx) ||
                usipx->sipx_family != AF_IPX)
                  goto out;
      } else {
            rc = -ENOTCONN;
            if (sk->sk_state != TCP_ESTABLISHED)
                  goto out;

            usipx = &local_sipx;
            usipx->sipx_family      = AF_IPX;
            usipx->sipx_type  = ipxs->type;
            usipx->sipx_port  = ipxs->dest_addr.sock;
            usipx->sipx_network     = ipxs->dest_addr.net;
            memcpy(usipx->sipx_node, ipxs->dest_addr.node, IPX_NODE_LEN);
      }

      rc = ipxrtr_route_packet(sk, usipx, msg->msg_iov, len,
                         flags & MSG_DONTWAIT);
      if (rc >= 0)
            rc = len;
out:
      return rc;
}


static int ipx_recvmsg(struct kiocb *iocb, struct socket *sock,
            struct msghdr *msg, size_t size, int flags)
{
      struct sock *sk = sock->sk;
      struct ipx_sock *ipxs = ipx_sk(sk);
      struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)msg->msg_name;
      struct ipxhdr *ipx = NULL;
      struct sk_buff *skb;
      int copied, rc;

      /* put the autobinding in */
      if (!ipxs->port) {
            struct sockaddr_ipx uaddr;

            uaddr.sipx_port         = 0;
            uaddr.sipx_network      = 0;

#ifdef CONFIG_IPX_INTERN
            rc = -ENETDOWN;
            if (!ipxs->intrfc)
                  goto out; /* Someone zonked the iface */
            memcpy(uaddr.sipx_node, ipxs->intrfc->if_node, IPX_NODE_LEN);
#endif      /* CONFIG_IPX_INTERN */

            rc = ipx_bind(sock, (struct sockaddr *)&uaddr,
                        sizeof(struct sockaddr_ipx));
            if (rc)
                  goto out;
      }

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

      skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
                        flags & MSG_DONTWAIT, &rc);
      if (!skb)
            goto out;

      ipx   = ipx_hdr(skb);
      copied      = ntohs(ipx->ipx_pktsize) - sizeof(struct ipxhdr);
      if (copied > size) {
            copied = size;
            msg->msg_flags |= MSG_TRUNC;
      }

      rc = skb_copy_datagram_iovec(skb, sizeof(struct ipxhdr), msg->msg_iov,
                             copied);
      if (rc)
            goto out_free;
      if (skb->tstamp.tv64)
            sk->sk_stamp = skb->tstamp;

      msg->msg_namelen = sizeof(*sipx);

      if (sipx) {
            sipx->sipx_family = AF_IPX;
            sipx->sipx_port         = ipx->ipx_source.sock;
            memcpy(sipx->sipx_node, ipx->ipx_source.node, IPX_NODE_LEN);
            sipx->sipx_network      = IPX_SKB_CB(skb)->ipx_source_net;
            sipx->sipx_type   = ipx->ipx_type;
            sipx->sipx_zero         = 0;
      }
      rc = copied;

out_free:
      skb_free_datagram(sk, skb);
out:
      return rc;
}


static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
      int rc = 0;
      long amount = 0;
      struct sock *sk = sock->sk;
      void __user *argp = (void __user *)arg;

      switch (cmd) {
      case TIOCOUTQ:
            amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
            if (amount < 0)
                  amount = 0;
            rc = put_user(amount, (int __user *)argp);
            break;
      case TIOCINQ: {
            struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
            /* These two are safe on a single CPU system as only
             * user tasks fiddle here */
            if (skb)
                  amount = skb->len - sizeof(struct ipxhdr);
            rc = put_user(amount, (int __user *)argp);
            break;
      }
      case SIOCADDRT:
      case SIOCDELRT:
            rc = -EPERM;
            if (capable(CAP_NET_ADMIN))
                  rc = ipxrtr_ioctl(cmd, argp);
            break;
      case SIOCSIFADDR:
      case SIOCAIPXITFCRT:
      case SIOCAIPXPRISLT:
            rc = -EPERM;
            if (!capable(CAP_NET_ADMIN))
                  break;
      case SIOCGIFADDR:
            rc = ipxitf_ioctl(cmd, argp);
            break;
      case SIOCIPXCFGDATA:
            rc = ipxcfg_get_config_data(argp);
            break;
      case SIOCIPXNCPCONN:
            /*
             * This socket wants to take care of the NCP connection
             * handed to us in arg.
             */
            rc = -EPERM;
            if (!capable(CAP_NET_ADMIN))
                  break;
            rc = get_user(ipx_sk(sk)->ipx_ncp_conn,
                        (const unsigned short __user *)argp);
            break;
      case SIOCGSTAMP:
            rc = -EINVAL;
            if (sk)
                  rc = sock_get_timestamp(sk, argp);
            break;
      case SIOCGIFDSTADDR:
      case SIOCSIFDSTADDR:
      case SIOCGIFBRDADDR:
      case SIOCSIFBRDADDR:
      case SIOCGIFNETMASK:
      case SIOCSIFNETMASK:
            rc = -EINVAL;
            break;
      default:
            rc = -ENOIOCTLCMD;
            break;
      }

      return rc;
}


#ifdef CONFIG_COMPAT
static int ipx_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
      /*
       * These 4 commands use same structure on 32bit and 64bit.  Rest of IPX
       * commands is handled by generic ioctl code.  As these commands are
       * SIOCPROTOPRIVATE..SIOCPROTOPRIVATE+3, they cannot be handled by generic
       * code.
       */
      switch (cmd) {
      case SIOCAIPXITFCRT:
      case SIOCAIPXPRISLT:
      case SIOCIPXCFGDATA:
      case SIOCIPXNCPCONN:
            return ipx_ioctl(sock, cmd, arg);
      default:
            return -ENOIOCTLCMD;
      }
}
#endif


/*
 * Socket family declarations
 */

static struct net_proto_family ipx_family_ops = {
      .family           = PF_IPX,
      .create           = ipx_create,
      .owner            = THIS_MODULE,
};

static const struct proto_ops SOCKOPS_WRAPPED(ipx_dgram_ops) = {
      .family           = PF_IPX,
      .owner            = THIS_MODULE,
      .release    = ipx_release,
      .bind       = ipx_bind,
      .connect    = ipx_connect,
      .socketpair = sock_no_socketpair,
      .accept           = sock_no_accept,
      .getname    = ipx_getname,
      .poll       = datagram_poll,
      .ioctl            = ipx_ioctl,
#ifdef CONFIG_COMPAT
      .compat_ioctl     = ipx_compat_ioctl,
#endif
      .listen           = sock_no_listen,
      .shutdown   = sock_no_shutdown, /* FIXME: support shutdown */
      .setsockopt = ipx_setsockopt,
      .getsockopt = ipx_getsockopt,
      .sendmsg    = ipx_sendmsg,
      .recvmsg    = ipx_recvmsg,
      .mmap       = sock_no_mmap,
      .sendpage   = sock_no_sendpage,
};

SOCKOPS_WRAP(ipx_dgram, PF_IPX);

static struct packet_type ipx_8023_packet_type = {
      .type       = __constant_htons(ETH_P_802_3),
      .func       = ipx_rcv,
};

static struct packet_type ipx_dix_packet_type = {
      .type       = __constant_htons(ETH_P_IPX),
      .func       = ipx_rcv,
};

static struct notifier_block ipx_dev_notifier = {
      .notifier_call    = ipxitf_device_event,
};

extern struct datalink_proto *make_EII_client(void);
extern void destroy_EII_client(struct datalink_proto *);

static unsigned char ipx_8022_type = 0xE0;
static unsigned char ipx_snap_id[5] = { 0x0, 0x0, 0x0, 0x81, 0x37 };
static char ipx_EII_err_msg[] __initdata =
      KERN_CRIT "IPX: Unable to register with Ethernet II\n";
static char ipx_8023_err_msg[] __initdata =
      KERN_CRIT "IPX: Unable to register with 802.3\n";
static char ipx_llc_err_msg[] __initdata =
      KERN_CRIT "IPX: Unable to register with 802.2\n";
static char ipx_snap_err_msg[] __initdata =
      KERN_CRIT "IPX: Unable to register with SNAP\n";

static int __init ipx_init(void)
{
      int rc = proto_register(&ipx_proto, 1);

      if (rc != 0)
            goto out;

      sock_register(&ipx_family_ops);

      pEII_datalink = make_EII_client();
      if (pEII_datalink)
            dev_add_pack(&ipx_dix_packet_type);
      else
            printk(ipx_EII_err_msg);

      p8023_datalink = make_8023_client();
      if (p8023_datalink)
            dev_add_pack(&ipx_8023_packet_type);
      else
            printk(ipx_8023_err_msg);

      p8022_datalink = register_8022_client(ipx_8022_type, ipx_rcv);
      if (!p8022_datalink)
            printk(ipx_llc_err_msg);

      pSNAP_datalink = register_snap_client(ipx_snap_id, ipx_rcv);
      if (!pSNAP_datalink)
            printk(ipx_snap_err_msg);

      register_netdevice_notifier(&ipx_dev_notifier);
      ipx_register_sysctl();
      ipx_proc_init();
out:
      return rc;
}

static void __exit ipx_proto_finito(void)
{
      ipx_proc_exit();
      ipx_unregister_sysctl();

      unregister_netdevice_notifier(&ipx_dev_notifier);

      ipxitf_cleanup();

      if (pSNAP_datalink) {
            unregister_snap_client(pSNAP_datalink);
            pSNAP_datalink = NULL;
      }

      if (p8022_datalink) {
            unregister_8022_client(p8022_datalink);
            p8022_datalink = NULL;
      }

      dev_remove_pack(&ipx_8023_packet_type);
      if (p8023_datalink) {
            destroy_8023_client(p8023_datalink);
            p8023_datalink = NULL;
      }

      dev_remove_pack(&ipx_dix_packet_type);
      if (pEII_datalink) {
            destroy_EII_client(pEII_datalink);
            pEII_datalink = NULL;
      }

      proto_unregister(&ipx_proto);
      sock_unregister(ipx_family_ops.family);
}

module_init(ipx_init);
module_exit(ipx_proto_finito);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_IPX);

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