Linux-2.6.12-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!

7 files changed, 2927 insertions, 0 deletions

diff --git a/net/ipx/ChangeLog b/net/ipx/ChangeLog
new file mode 100644
index 000000000000..3b29763751a3
--- /dev/null
+++ b/net/ipx/ChangeLog
@@ -0,0 +1,101 @@
+ Revision 0.21:	Uses the new generic socket option code.
+
+ Revision 0.22:	Gcc clean ups and drop out device registration. Use the
+ 		new multi-protocol edition of hard_header
+
+ Revision 0.23: IPX /proc by Mark Evans. Adding a route will
+ 		will overwrite any existing route to the same network.
+
+ Revision 0.24:	Supports new /proc with no 4K limit
+
+ Revision 0.25:	Add ephemeral sockets, passive local network
+ 		identification, support for local net 0 and
+ 		multiple datalinks <Greg Page>
+
+ Revision 0.26: Device drop kills IPX routes via it. (needed for module)
+
+ Revision 0.27: Autobind <Mark Evans>
+
+ Revision 0.28: Small fix for multiple local networks <Thomas Winder>
+
+ Revision 0.29: Assorted major errors removed <Mark Evans>
+ 		Small correction to promisc mode error fix <Alan Cox>
+ 		Asynchronous I/O support. Changed to use notifiers
+ 		and the newer packet_type stuff. Assorted major
+ 		fixes <Alejandro Liu>
+
+ Revision 0.30:	Moved to net/ipx/...	<Alan Cox>
+ 		Don't set address length on recvfrom that errors.
+ 		Incorrect verify_area.
+
+ Revision 0.31:	New sk_buffs. This still needs a lot of 
+ 		testing. <Alan Cox>
+
+ Revision 0.32: Using sock_alloc_send_skb, firewall hooks. <Alan Cox>
+ 		Supports sendmsg/recvmsg
+
+ Revision 0.33:	Internal network support, routing changes, uses a
+ 		protocol private area for ipx data.
+
+ Revision 0.34:	Module support. <Jim Freeman>
+
+ Revision 0.35: Checksum support. <Neil Turton>, hooked in by <Alan Cox>
+ 		Handles WIN95 discovery packets <Volker Lendecke>
+
+ Revision 0.36:	Internal bump up for 2.1
+
+ Revision 0.37:	Began adding POSIXisms.
+
+ Revision 0.38: Asynchronous socket stuff made current.
+
+ Revision 0.39: SPX interfaces
+
+ Revision 0.40: Tiny SIOCGSTAMP fix (chris@cybernet.co.nz)
+
+ Revision 0.41: 802.2TR removed (p.norton@computer.org)
+ 		Fixed connecting to primary net,
+ 		Automatic binding on send & receive,
+ 		Martijn van Oosterhout <kleptogimp@geocities.com>
+
+ Revision 042:  Multithreading - use spinlocks and refcounting to
+ 		protect some structures: ipx_interface sock list, list
+ 		of ipx interfaces, etc. 
+ 		Bugfixes - do refcounting on net_devices, check function
+ 		results, etc. Thanks to davem and freitag for
+ 		suggestions and guidance.
+ 		Arnaldo Carvalho de Melo <acme@conectiva.com.br>,
+ 		November, 2000
+
+ Revision 043:	Shared SKBs, don't mangle packets, some cleanups
+ 		Arnaldo Carvalho de Melo <acme@conectiva.com.br>,
+ 		December, 2000
+
+ Revision 044:	Call ipxitf_hold on NETDEV_UP - acme
+
+ Revision 045:	fix PPROP routing bug - acme
+
+ Revision 046:	Further fixes to PPROP, ipxitf_create_internal was
+ 		doing an unneeded MOD_INC_USE_COUNT, implement
+ 		sysctl for ipx_pprop_broacasting, fix the ipx sysctl
+ 		handling, making it dynamic, some cleanups, thanks to
+ 		Petr Vandrovec for review and good suggestions. (acme)
+
+ Revision 047:	Cleanups, CodingStyle changes, move the ncp connection
+ 		hack out of line - acme
+
+ Revision 048:	Use sk->protinfo to store the pointer to IPX private
+ 		area, remove af_ipx from sk->protinfo and move ipx_opt
+ 		to include/net/ipx.h, use IPX_SK like DecNET, etc - acme
+
+ Revision 049:	SPX support dropped, see comment in ipx_create - acme
+
+ Revision 050:	Use seq_file for proc stuff, moving it to ipx_proc.c - acme
+
+Other fixes:
+ 
+ Protect the module by a MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT pair. Also, now
+ usage count is managed this way:
+ -Count one if the auto_interface mode is on
+ -Count one per configured interface
+ 
+ Jacques Gelinas (jacques@solucorp.qc.ca)
diff --git a/net/ipx/Kconfig b/net/ipx/Kconfig
new file mode 100644
index 000000000000..a16237c0e783
--- /dev/null
+++ b/net/ipx/Kconfig
@@ -0,0 +1,31 @@
+#
+# IPX configuration
+#
+config IPX_INTERN
+	bool "IPX: Full internal IPX network"
+	depends on IPX
+	---help---
+	  Every IPX network has an address that identifies it. Sometimes it is
+	  useful to give an IPX "network" address to your Linux box as well
+	  (for example if your box is acting as a file server for different
+	  IPX networks: it will then be accessible from everywhere using the
+	  same address). The way this is done is to create a virtual internal
+	  "network" inside your box and to assign an IPX address to this
+	  network. Say Y here if you want to do this; read the IPX-HOWTO at
+	  <http://www.tldp.org/docs.html#howto> for details.
+
+	  The full internal IPX network enables you to allocate sockets on
+	  different virtual nodes of the internal network. This is done by
+	  evaluating the field sipx_node of the socket address given to the
+	  bind call. So applications should always initialize the node field
+	  to 0 when binding a socket on the primary network. In this case the
+	  socket is assigned the default node that has been given to the
+	  kernel when the internal network was created. By enabling the full
+	  internal IPX network the cross-forwarding of packets targeted at
+	  'special' sockets to sockets listening on the primary network is
+	  disabled. This might break existing applications, especially RIP/SAP
+	  daemons. A RIP/SAP daemon that works well with the full internal net
+	  can be found on <ftp://ftp.gwdg.de/pub/linux/misc/ncpfs/>.
+
+	  If you don't know what you are doing, say N.
+
diff --git a/net/ipx/Makefile b/net/ipx/Makefile
new file mode 100644
index 000000000000..4b95e3ea0f8b
--- /dev/null
+++ b/net/ipx/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for the Linux IPX layer.
+#
+
+obj-$(CONFIG_IPX) += ipx.o
+
+ipx-y			:= af_ipx.o ipx_route.o ipx_proc.o
+ipx-$(CONFIG_SYSCTL)	+= sysctl_net_ipx.o
diff --git a/net/ipx/af_ipx.c b/net/ipx/af_ipx.c
new file mode 100644
index 000000000000..5a27e5df5886
--- /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;