Linux-2.6.12-rc2v2.6.12-rc2

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

Let it rip!

1 files changed, 2024 insertions, 0 deletions

diff --git a/net/ipx/af_ipx.c b/net/ipx/af_ipx.c
new file mode 100644
index 00000000000..5a27e5df588
--- /dev/null
+++ b/net/ipx/af_ipx.c
@@ -0,0 +1,2024 @@
+/*
+ *	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/config.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/tcp.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 <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 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(__u32 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, int len, int noblock);
+extern int ipxrtr_route_skb(struct sk_buff *skb);
+extern struct ipx_route *ipxrtr_lookup(__u32 net);
+extern int ipxrtr_ioctl(unsigned int cmd, void __user *arg);
+
+#undef IPX_REFCNT_DEBUG
+#ifdef IPX_REFCNT_DEBUG
+atomic_t ipx_sock_nr;
+#endif
+
+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);
+#ifdef IPX_REFCNT_DEBUG
+        atomic_dec(&ipx_sock_nr);
+        printk(KERN_DEBUG "IPX socket %p released, %d are still alive\n", sk,
+			atomic_read(&ipx_sock_nr));
+	if (atomic_read(&sk->sk_refcnt) != 1)
+		printk(KERN_DEBUG "Destruction sock ipx %p delayed, cnt=%d\n",
+				sk, atomic_read(&sk->sk_refcnt));
+#endif
+	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,
+						      unsigned short 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,
+						    unsigned short 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(__u32 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,
+					 unsigned short 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,
+					unsigned short 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,
+						unsigned short 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 (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);
+		skb2->nh.raw = skb2->h.raw = 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) {
+		u32 *last_hop = (u32 *)(((u8 *) skb->data) +
+				sizeof(struct ipxhdr) +
+				IPX_SKB_CB(skb)->last_hop.index *
+				sizeof(u32));
+		*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) htonl(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;
+	u32 *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 = (u32 *) 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 = (__u32 *) 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, __u32 netnum,
+					  unsigned short 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 int ipx_map_frame_type(unsigned char type)
+{
+	int 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;
+	unsigned short 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(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;
+	unsigned short 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(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,
+						unsigned short 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 (htons(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(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 */
+
+__u16 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.)
+	 */
+	/* start at ipx_dest - We skip the checksum field and start with
+	 * ipx_type before the loop, not considering ipx_tctrl in the calc */
+	__u16 *p = (__u16 *)&packet->ipx_dest;
+	__u32 i = (length >> 1) - 1; /* Number of complete words */
+	__u32 sum = packet->ipx_type << sizeof(packet->ipx_tctrl); 
+
+	/* Loop through all complete words except the checksum field,
+	 * ipx_type (accounted above) and ipx_tctrl (not used in the cksum) */
+	while (--i)
+		sum += *p++;
+
+	/* Add on the last part word if it exists */
+	if (packet->ipx_pktsize & htons(1))
+		sum += ntohs(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++;
+
+	return ~sum;
+}
+
+const char *ipx_frame_name(unsigned short 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 socket *sock, int protocol)
+{
+	int rc = -ESOCKTNOSUPPORT;
+	struct sock *sk;
+
+	/*
+	 * 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(PF_IPX, GFP_KERNEL, &ipx_proto, 1);
+	if (!sk)
+		goto out;
+#ifdef IPX_REFCNT_DEBUG
+        atomic_inc(&ipx_sock_nr);
+        printk(KERN_DEBUG "IPX socket %p created, now we have %d alive\n", sk,
+			atomic_read(&ipx_sock_nr));
+#endif
+	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;
+	ipx_destroy_socket(sk);
+out:
+	return 0;
+}
+
+/* caller must hold a reference to intrfc */
+
+static unsigned short 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, ntohs(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 ntohs(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((int)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((int)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)
+{
+	/* NULL here for pt means the packet was looped back */
+	struct ipx_interface *intrfc;
+	struct ipxhdr *ipx;
+	u16 ipx_pktsize;
+	int rc = 0;
+		
+	/* Not ours */	
+        if (skb->pkt_type == PACKET_OTHERHOST)
+        	goto drop;
+
+	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
+		goto out;
+
+	ipx		= ipx_hdr(skb);
+	ipx_pktsize	= ntohs(ipx->ipx_pktsize);
+	
+	/* Too small or invalid header? */
+	if (ipx_pktsize < sizeof(struct ipxhdr) || ipx_pktsize > skb->len)
+		goto drop;
+                        
+	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 &&
+		   ntohl(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->stamp.tv_sec)
+		sk->sk_stamp = skb->stamp;
+
+	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 = dev_ioctl(cmd, argp);
+		break;
+	}
+
+	return rc;
+}
+
+/*
+ * Socket family declarations
+ */
+
+static struct net_proto_family ipx_family_ops = {
+	.family		= PF_IPX,
+	.create		= ipx_create,
+	.owner		= THIS_MODULE,
+};
+
+static 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,
+	.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,
+};
+
+#include <linux/smp_lock.h>
+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 struct datalink_proto *make_8023_client(void);
+extern void destroy_EII_client(struct datalink_proto *);
+extern void destroy_8023_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();
+
+	unregister_snap_client(pSNAP_datalink);
+	pSNAP_datalink = NULL;
+
+	unregister_8022_client(p8022_datalink);
+	p8022_datalink = NULL;
+
+	dev_remove_pack(&ipx_8023_packet_type);
+	destroy_8023_client(p8023_datalink);
+	p8023_datalink = NULL;
+
+	dev_remove_pack(&ipx_dix_packet_type);
+	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);