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!

9 files changed, 1552 insertions, 0 deletions

diff --git a/net/802/Makefile b/net/802/Makefile
new file mode 100644
index 00000000000..01861929591
--- /dev/null
+++ b/net/802/Makefile
@@ -0,0 +1,15 @@
+#
+# Makefile for the Linux 802.x protocol layers.
+#
+
+obj-y			:= p8023.o
+
+# Check the p8022 selections against net/core/Makefile.
+obj-$(CONFIG_SYSCTL)	+= sysctl_net_802.o
+obj-$(CONFIG_LLC)	+= p8022.o psnap.o
+obj-$(CONFIG_TR)	+= p8022.o psnap.o tr.o sysctl_net_802.o
+obj-$(CONFIG_NET_FC)	+=                 fc.o
+obj-$(CONFIG_FDDI)	+=                 fddi.o
+obj-$(CONFIG_HIPPI)	+=                 hippi.o
+obj-$(CONFIG_IPX)	+= p8022.o psnap.o
+obj-$(CONFIG_ATALK)	+= p8022.o psnap.o
diff --git a/net/802/fc.c b/net/802/fc.c
new file mode 100644
index 00000000000..640d34e026c
--- /dev/null
+++ b/net/802/fc.c
@@ -0,0 +1,130 @@
+/*
+ * NET3:	Fibre Channel device handling subroutines
+ * 
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ *		Vineet Abraham <vma@iol.unh.edu>
+ *		v 1.0 03/22/99
+ */
+
+#include <linux/config.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/fcdevice.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/net.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <net/arp.h>
+
+/*
+ *	Put the headers on a Fibre Channel packet. 
+ */
+ 
+static int fc_header(struct sk_buff *skb, struct net_device *dev,
+		     unsigned short type,
+		     void *daddr, void *saddr, unsigned len) 
+{
+	struct fch_hdr *fch;
+	int hdr_len;
+
+	/* 
+	 * Add the 802.2 SNAP header if IP as the IPv4 code calls  
+	 * dev->hard_header directly.
+	 */
+	if (type == ETH_P_IP || type == ETH_P_ARP)
+	{
+		struct fcllc *fcllc;
+
+		hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
+		fch = (struct fch_hdr *)skb_push(skb, hdr_len);
+		fcllc = (struct fcllc *)(fch+1);
+		fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
+		fcllc->llc = UI_CMD;
+		fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
+		fcllc->ethertype = htons(type);
+	}
+	else
+	{
+		hdr_len = sizeof(struct fch_hdr);
+		fch = (struct fch_hdr *)skb_push(skb, hdr_len);	
+	}
+
+	if(saddr)
+		memcpy(fch->saddr,saddr,dev->addr_len);
+	else
+		memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
+
+	if(daddr) 
+	{
+		memcpy(fch->daddr,daddr,dev->addr_len);
+		return(hdr_len);
+	}
+	return -hdr_len;
+}
+	
+/*
+ *	A neighbour discovery of some species (eg arp) has completed. We
+ *	can now send the packet.
+ */
+ 
+static int fc_rebuild_header(struct sk_buff *skb) 
+{
+	struct fch_hdr *fch=(struct fch_hdr *)skb->data;
+	struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr));
+	if(fcllc->ethertype != htons(ETH_P_IP)) {
+		printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n",(unsigned int)htons(fcllc->ethertype));
+		return 0;
+	}
+#ifdef CONFIG_INET
+	return arp_find(fch->daddr, skb);
+#else
+	return 0;
+#endif
+}
+
+static void fc_setup(struct net_device *dev)
+{
+	dev->hard_header	= fc_header;
+	dev->rebuild_header	= fc_rebuild_header;
+                
+	dev->type		= ARPHRD_IEEE802;
+	dev->hard_header_len	= FC_HLEN;
+	dev->mtu		= 2024;
+	dev->addr_len		= FC_ALEN;
+	dev->tx_queue_len	= 100; /* Long queues on fc */
+	dev->flags		= IFF_BROADCAST;
+
+	memset(dev->broadcast, 0xFF, FC_ALEN);
+}
+
+/**
+ * alloc_fcdev - Register fibre channel device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ *	for this fibre channel device
+ *
+ * Fill in the fields of the device structure with fibre channel-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+struct net_device *alloc_fcdev(int sizeof_priv)
+{
+	return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
+}
+EXPORT_SYMBOL(alloc_fcdev);
diff --git a/net/802/fddi.c b/net/802/fddi.c
new file mode 100644
index 00000000000..f9a31a9f70f
--- /dev/null
+++ b/net/802/fddi.c
@@ -0,0 +1,210 @@
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		FDDI-type device handling.
+ *
+ * Version:	@(#)fddi.c	1.0.0	08/12/96
+ *
+ * Authors:	Lawrence V. Stefani, <stefani@lkg.dec.com>
+ *
+ *		fddi.c is based on previous eth.c and tr.c work by
+ *			Ross Biro, <bir7@leland.Stanford.Edu>
+ *			Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *			Mark Evans, <evansmp@uhura.aston.ac.uk>
+ *			Florian La Roche, <rzsfl@rz.uni-sb.de>
+ *			Alan Cox, <gw4pts@gw4pts.ampr.org>
+ * 
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ *	Changes
+ *		Alan Cox		:	New arp/rebuild header
+ *		Maciej W. Rozycki	:	IPv6 support
+ */
+ 
+#include <linux/config.h>
+#include <linux/module.h>
+#include <asm/system.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/fddidevice.h>
+#include <linux/if_ether.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <net/arp.h>
+#include <net/sock.h>
+
+/*
+ * Create the FDDI MAC header for an arbitrary protocol layer
+ *
+ * saddr=NULL	means use device source address
+ * daddr=NULL	means leave destination address (eg unresolved arp)
+ */
+
+static int fddi_header(struct sk_buff *skb, struct net_device *dev,
+		       unsigned short type,
+		       void *daddr, void *saddr, unsigned len)
+{
+	int hl = FDDI_K_SNAP_HLEN;
+	struct fddihdr *fddi;
+	
+	if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)
+		hl=FDDI_K_8022_HLEN-3;
+	fddi = (struct fddihdr *)skb_push(skb, hl);
+	fddi->fc			 = FDDI_FC_K_ASYNC_LLC_DEF;
+	if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
+	{
+		fddi->hdr.llc_snap.dsap		 = FDDI_EXTENDED_SAP;
+		fddi->hdr.llc_snap.ssap		 = FDDI_EXTENDED_SAP;
+		fddi->hdr.llc_snap.ctrl		 = FDDI_UI_CMD;
+		fddi->hdr.llc_snap.oui[0]	 = 0x00;
+		fddi->hdr.llc_snap.oui[1]	 = 0x00;
+		fddi->hdr.llc_snap.oui[2]	 = 0x00;
+		fddi->hdr.llc_snap.ethertype	 = htons(type);
+	}
+
+	/* Set the source and destination hardware addresses */
+	 
+	if (saddr != NULL)
+		memcpy(fddi->saddr, saddr, dev->addr_len);
+	else
+		memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
+
+	if (daddr != NULL)
+	{
+		memcpy(fddi->daddr, daddr, dev->addr_len);
+		return(hl);
+	}
+
+	return(-hl);
+}
+
+
+/*
+ * Rebuild the FDDI MAC header. This is called after an ARP
+ * (or in future other address resolution) has completed on
+ * this sk_buff.  We now let ARP fill in the other fields.
+ */
+ 
+static int fddi_rebuild_header(struct sk_buff	*skb)
+{
+	struct fddihdr *fddi = (struct fddihdr *)skb->data;
+
+#ifdef CONFIG_INET
+	if (fddi->hdr.llc_snap.ethertype == __constant_htons(ETH_P_IP))
+		/* Try to get ARP to resolve the header and fill destination address */
+		return arp_find(fddi->daddr, skb);
+	else
+#endif	
+	{
+		printk("%s: Don't know how to resolve type %02X addresses.\n",
+		       skb->dev->name, htons(fddi->hdr.llc_snap.ethertype));
+		return(0);
+	}
+}
+
+
+/*
+ * Determine the packet's protocol ID and fill in skb fields.
+ * This routine is called before an incoming packet is passed
+ * up.  It's used to fill in specific skb fields and to set
+ * the proper pointer to the start of packet data (skb->data).
+ */
+ 
+unsigned short fddi_type_trans(struct sk_buff *skb, struct net_device *dev)
+{
+	struct fddihdr *fddi = (struct fddihdr *)skb->data;
+	unsigned short type;
+	
+	/*
+	 * Set mac.raw field to point to FC byte, set data field to point
+	 * to start of packet data.  Assume 802.2 SNAP frames for now.
+	 */
+
+	skb->mac.raw = skb->data;	/* point to frame control (FC) */
+	
+	if(fddi->hdr.llc_8022_1.dsap==0xe0)
+	{
+		skb_pull(skb, FDDI_K_8022_HLEN-3);
+		type = __constant_htons(ETH_P_802_2);
+	}
+	else
+	{
+		skb_pull(skb, FDDI_K_SNAP_HLEN);		/* adjust for 21 byte header */
+		type=fddi->hdr.llc_snap.ethertype;
+	}
+	
+	/* Set packet type based on destination address and flag settings */
+			
+	if (*fddi->daddr & 0x01)
+	{
+		if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
+			skb->pkt_type = PACKET_BROADCAST;
+		else
+			skb->pkt_type = PACKET_MULTICAST;
+	}
+	
+	else if (dev->flags & IFF_PROMISC)
+	{
+		if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
+			skb->pkt_type = PACKET_OTHERHOST;
+	}
+
+	/* Assume 802.2 SNAP frames, for now */
+
+	return(type);
+}
+
+EXPORT_SYMBOL(fddi_type_trans);
+
+static int fddi_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if ((new_mtu < FDDI_K_SNAP_HLEN) || (new_mtu > FDDI_K_SNAP_DLEN))
+		return(-EINVAL);
+	dev->mtu = new_mtu;
+	return(0);
+}
+
+static void fddi_setup(struct net_device *dev)
+{
+	dev->change_mtu		= fddi_change_mtu;
+	dev->hard_header	= fddi_header;
+	dev->rebuild_header	= fddi_rebuild_header;
+
+	dev->type		= ARPHRD_FDDI;
+	dev->hard_header_len	= FDDI_K_SNAP_HLEN+3;	/* Assume 802.2 SNAP hdr len + 3 pad bytes */
+	dev->mtu		= FDDI_K_SNAP_DLEN;	/* Assume max payload of 802.2 SNAP frame */
+	dev->addr_len		= FDDI_K_ALEN;
+	dev->tx_queue_len	= 100;			/* Long queues on FDDI */
+	dev->flags		= IFF_BROADCAST | IFF_MULTICAST;
+	
+	memset(dev->broadcast, 0xFF, FDDI_K_ALEN);
+}
+
+/**
+ * alloc_fddidev - Register FDDI device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ *	for this FDDI device
+ *
+ * Fill in the fields of the device structure with FDDI-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+struct net_device *alloc_fddidev(int sizeof_priv)
+{
+	return alloc_netdev(sizeof_priv, "fddi%d", fddi_setup);
+}
+EXPORT_SYMBOL(alloc_fddidev);
diff --git a/net/802/hippi.c b/net/802/hippi.c
new file mode 100644
index 00000000000..4eb135c0afb
--- /dev/null
+++ b/net/802/hippi.c
@@ -0,0 +1,234 @@
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		HIPPI-type device handling.
+ *
+ * Version:	@(#)hippi.c	1.0.0	05/29/97
+ *
+ * Authors:	Ross Biro, <bir7@leland.Stanford.Edu>
+ *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *		Mark Evans, <evansmp@uhura.aston.ac.uk>
+ *		Florian  La Roche, <rzsfl@rz.uni-sb.de>
+ *		Alan Cox, <gw4pts@gw4pts.ampr.org>
+ *		Jes Sorensen, <Jes.Sorensen@cern.ch>
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/hippidevice.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <net/arp.h>
+#include <net/sock.h>
+#include <asm/uaccess.h>
+#include <asm/checksum.h>
+#include <asm/system.h>
+
+/*
+ * Create the HIPPI MAC header for an arbitrary protocol layer 
+ *
+ * saddr=NULL	means use device source address
+ * daddr=NULL	means leave destination address (eg unresolved arp)
+ */
+
+static int hippi_header(struct sk_buff *skb, struct net_device *dev,
+			unsigned short type, void *daddr, void *saddr,
+			unsigned len)
+{
+	struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
+
+	if (!len){
+		len = skb->len - HIPPI_HLEN;
+		printk("hippi_header(): length not supplied\n");
+	}
+
+	/*
+	 * Due to the stupidity of the little endian byte-order we
+	 * have to set the fp field this way.
+	 */
+	hip->fp.fixed		= __constant_htonl(0x04800018);
+	hip->fp.d2_size		= htonl(len + 8);
+	hip->le.fc		= 0;
+	hip->le.double_wide	= 0;	/* only HIPPI 800 for the time being */
+	hip->le.message_type	= 0;	/* Data PDU */
+
+	hip->le.dest_addr_type	= 2;	/* 12 bit SC address */
+	hip->le.src_addr_type	= 2;	/* 12 bit SC address */
+
+	memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
+	memset(&hip->le.reserved, 0, 16);
+
+	hip->snap.dsap		= HIPPI_EXTENDED_SAP;
+	hip->snap.ssap		= HIPPI_EXTENDED_SAP;
+	hip->snap.ctrl		= HIPPI_UI_CMD;
+	hip->snap.oui[0]	= 0x00;
+	hip->snap.oui[1]	= 0x00;
+	hip->snap.oui[2]	= 0x00;
+	hip->snap.ethertype	= htons(type);
+
+	if (daddr)
+	{
+		memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
+		memcpy(&skb->private.ifield, daddr + 2, 4);
+		return HIPPI_HLEN;
+	}
+	return -((int)HIPPI_HLEN);
+}
+
+
+/*
+ * Rebuild the HIPPI MAC header. This is called after an ARP has
+ * completed on this sk_buff. We now let ARP fill in the other fields.
+ */
+
+static int hippi_rebuild_header(struct sk_buff *skb)
+{
+	struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
+
+	/*
+	 * Only IP is currently supported
+	 */
+	 
+	if(hip->snap.ethertype != __constant_htons(ETH_P_IP)) 
+	{
+		printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
+		return 0;
+	}
+
+	/*
+	 * We don't support dynamic ARP on HIPPI, but we use the ARP
+	 * static ARP tables to hold the I-FIELDs.
+	 */
+	return arp_find(hip->le.daddr, skb);
+}
+
+
+/*
+ *	Determine the packet's protocol ID.
+ */
+ 
+unsigned short hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
+{
+	struct hippi_hdr *hip;
+	
+	hip = (struct hippi_hdr *) skb->data;
+
+	/*
+	 * This is actually wrong ... question is if we really should
+	 * set the raw address here.
+	 */
+	 skb->mac.raw = skb->data;
+	 skb_pull(skb, HIPPI_HLEN);
+
+	/*
+	 * No fancy promisc stuff here now.
+	 */
+
+	return hip->snap.ethertype;
+}
+
+EXPORT_SYMBOL(hippi_type_trans);
+
+static int hippi_change_mtu(struct net_device *dev, int new_mtu)
+{
+	/*
+	 * HIPPI's got these nice large MTUs.
+	 */
+	if ((new_mtu < 68) || (new_mtu > 65280))
+		return -EINVAL;
+	dev->mtu = new_mtu;
+	return(0);
+}
+
+/*
+ * For HIPPI we will actually use the lower 4 bytes of the hardware
+ * address as the I-FIELD rather than the actual hardware address.
+ */
+static int hippi_mac_addr(struct net_device *dev, void *p)
+{
+	struct sockaddr *addr = p;
+	if (netif_running(dev))
+		return -EBUSY;
+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+	return 0;
+}
+
+static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
+{
+	/* Never send broadcast/multicast ARP messages */
+	p->mcast_probes = 0;
+ 
+	/* In IPv6 unicast probes are valid even on NBMA,
+	* because they are encapsulated in normal IPv6 protocol.
+	* Should be a generic flag. 
+	*/
+	if (p->tbl->family != AF_INET6)
+		p->ucast_probes = 0;
+	return 0;
+}
+
+static void hippi_setup(struct net_device *dev)
+{
+	dev->set_multicast_list		= NULL;
+	dev->change_mtu			= hippi_change_mtu;
+	dev->hard_header		= hippi_header;
+	dev->rebuild_header 		= hippi_rebuild_header;
+	dev->set_mac_address 		= hippi_mac_addr;
+	dev->hard_header_parse		= NULL;
+	dev->hard_header_cache		= NULL;
+	dev->header_cache_update	= NULL;
+	dev->neigh_setup 		= hippi_neigh_setup_dev; 
+
+	/*
+	 * We don't support HIPPI `ARP' for the time being, and probably
+	 * never will unless someone else implements it. However we
+	 * still need a fake ARPHRD to make ifconfig and friends play ball.
+	 */
+	dev->type		= ARPHRD_HIPPI;
+	dev->hard_header_len 	= HIPPI_HLEN;
+	dev->mtu		= 65280;
+	dev->addr_len		= HIPPI_ALEN;
+	dev->tx_queue_len	= 25 /* 5 */;
+	memset(dev->broadcast, 0xFF, HIPPI_ALEN);
+
+
+	/*
+	 * HIPPI doesn't support broadcast+multicast and we only use
+	 * static ARP tables. ARP is disabled by hippi_neigh_setup_dev. 
+	 */
+	dev->flags = 0; 
+}
+
+/**
+ * alloc_hippi_dev - Register HIPPI device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ *	for this HIPPI device
+ *
+ * Fill in the fields of the device structure with HIPPI-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+
+struct net_device *alloc_hippi_dev(int sizeof_priv)
+{
+	return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
+}
+
+EXPORT_SYMBOL(alloc_hippi_dev);
diff --git a/net/802/p8022.c b/net/802/p8022.c
new file mode 100644
index 00000000000..5ae63416df6
--- /dev/null
+++ b/net/802/p8022.c
@@ -0,0 +1,65 @@
+/*
+ *	NET3:	Support for 802.2 demultiplexing off Ethernet (Token ring
+ *		is kept separate see p8022tr.c)
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ *		Demultiplex 802.2 encoded protocols. We match the entry by the
+ *		SSAP/DSAP pair and then deliver to the registered datalink that
+ *		matches. The control byte is ignored and handling of such items
+ *		is up to the routine passed the frame.
+ *
+ *		Unlike the 802.3 datalink we have a list of 802.2 entries as
+ *		there are multiple protocols to demux. The list is currently
+ *		short (3 or 4 entries at most). The current demux assumes this.
+ */
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/datalink.h>
+#include <linux/mm.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <net/llc.h>
+#include <net/p8022.h>
+
+static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb,
+			 unsigned char *dest)
+{
+	llc_build_and_send_ui_pkt(dl->sap, skb, dest, dl->sap->laddr.lsap);
+	return 0;
+}
+
+struct datalink_proto *register_8022_client(unsigned char type,
+					    int (*func)(struct sk_buff *skb,
+							struct net_device *dev,
+							struct packet_type *pt))
+{
+	struct datalink_proto *proto;
+
+	proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
+	if (proto) {
+		proto->type[0]		= type;
+		proto->header_length	= 3;
+		proto->request		= p8022_request;
+		proto->sap = llc_sap_open(type, func);
+		if (!proto->sap) {
+			kfree(proto);
+			proto = NULL;
+		}
+	}
+	return proto;
+}
+
+void unregister_8022_client(struct datalink_proto *proto)
+{
+	llc_sap_close(proto->sap);
+	kfree(proto);
+}
+
+EXPORT_SYMBOL(register_8022_client);
+EXPORT_SYMBOL(unregister_8022_client);
+
+MODULE_LICENSE("GPL");
diff --git a/net/802/p8023.c b/net/802/p8023.c
new file mode 100644
index 00000000000..a0b61b40225
--- /dev/null
+++ b/net/802/p8023.c
@@ -0,0 +1,61 @@
+/*
+ *	NET3:	802.3 data link hooks used for IPX 802.3
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ *
+ *	802.3 isn't really a protocol data link layer. Some old IPX stuff
+ *	uses it however. Note that there is only one 802.3 protocol layer
+ *	in the system. We don't currently support different protocols
+ *	running raw 802.3 on different devices. Thankfully nobody else
+ *	has done anything like the old IPX.
+ */
+
+#include <linux/in.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+
+#include <net/datalink.h>
+
+/*
+ *	Place an 802.3 header on a packet. The driver will do the mac
+ *	addresses, we just need to give it the buffer length.
+ */
+static int p8023_request(struct datalink_proto *dl,
+			 struct sk_buff *skb, unsigned char *dest_node)
+{
+	struct net_device *dev = skb->dev;
+
+	dev->hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
+	return dev_queue_xmit(skb);
+}
+
+/*
+ *	Create an 802.3 client. Note there can be only one 802.3 client
+ */
+struct datalink_proto *make_8023_client(void)
+{
+	struct datalink_proto *proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
+
+	if (proto) {
+		proto->header_length = 0;
+		proto->request	     = p8023_request;
+	}
+	return proto;
+}
+
+/*
+ *	Destroy the 802.3 client.
+ */
+void destroy_8023_client(struct datalink_proto *dl)
+{
+	if (dl)
+		kfree(dl);
+}
+
+EXPORT_SYMBOL(destroy_8023_client);
+EXPORT_SYMBOL(make_8023_client);
diff --git a/net/802/psnap.c b/net/802/psnap.c
new file mode 100644
index 00000000000..1053821ddf9
--- /dev/null
+++ b/net/802/psnap.c
@@ -0,0 +1,159 @@
+/*
+ *	SNAP data link layer. Derived from 802.2
+ *
+ *		Alan Cox <Alan.Cox@linux.org>,
+ *		from the 802.2 layer by Greg Page.
+ *		Merged in additions from Greg Page's psnap.c.
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/datalink.h>
+#include <net/llc.h>
+#include <net/psnap.h>
+#include <linux/mm.h>
+#include <linux/in.h>
+#include <linux/init.h>
+
+static LIST_HEAD(snap_list);
+static DEFINE_SPINLOCK(snap_lock);
+static struct llc_sap *snap_sap;
+
+/*
+ *	Find a snap client by matching the 5 bytes.
+ */
+static struct datalink_proto *find_snap_client(unsigned char *desc)
+{
+	struct list_head *entry;
+	struct datalink_proto *proto = NULL, *p;
+
+	list_for_each_rcu(entry, &snap_list) {
+		p = list_entry(entry, struct datalink_proto, node);
+		if (!memcmp(p->type, desc, 5)) {
+			proto = p;
+			break;
+		}
+	}
+	return proto;
+}
+
+/*
+ *	A SNAP packet has arrived
+ */
+static int snap_rcv(struct sk_buff *skb, struct net_device *dev,
+		    struct packet_type *pt)
+{
+	int rc = 1;
+	struct datalink_proto *proto;
+	static struct packet_type snap_packet_type = {
+		.type = __constant_htons(ETH_P_SNAP),
+	};
+
+	rcu_read_lock();
+	proto = find_snap_client(skb->h.raw);
+	if (proto) {
+		/* Pass the frame on. */
+		skb->h.raw  += 5;
+		skb_pull(skb, 5);
+		rc = proto->rcvfunc(skb, dev, &snap_packet_type);
+	} else {
+		skb->sk = NULL;
+		kfree_skb(skb);
+		rc = 1;
+	}
+
+	rcu_read_unlock();
+	return rc;
+}
+
+/*
+ *	Put a SNAP header on a frame and pass to 802.2
+ */
+static int snap_request(struct datalink_proto *dl,
+			struct sk_buff *skb, u8 *dest)
+{
+	memcpy(skb_push(skb, 5), dl->type, 5);
+	llc_build_and_send_ui_pkt(snap_sap, skb, dest, snap_sap->laddr.lsap);
+	return 0;
+}
+
+/*
+ *	Set up the SNAP layer
+ */
+EXPORT_SYMBOL(register_snap_client);
+EXPORT_SYMBOL(unregister_snap_client);
+
+static char snap_err_msg[] __initdata =
+	KERN_CRIT "SNAP - unable to register with 802.2\n";
+
+static int __init snap_init(void)
+{
+	snap_sap = llc_sap_open(0xAA, snap_rcv);
+
+	if (!snap_sap)
+		printk(snap_err_msg);
+
+	return 0;
+}
+
+module_init(snap_init);
+
+static void __exit snap_exit(void)
+{
+	llc_sap_close(snap_sap);
+}
+
+module_exit(snap_exit);
+
+
+/*
+ *	Register SNAP clients. We don't yet use this for IP.
+ */
+struct datalink_proto *register_snap_client(unsigned char *desc,
+					    int (*rcvfunc)(struct sk_buff *,
+						    	   struct net_device *,
+							   struct packet_type *))
+{
+	struct datalink_proto *proto = NULL;
+
+	spin_lock_bh(&snap_lock);
+
+	if (find_snap_client(desc))
+		goto out;
+
+	proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
+	if (proto) {
+		memcpy(proto->type, desc,5);
+		proto->rcvfunc		= rcvfunc;
+		proto->header_length	= 5 + 3; /* snap + 802.2 */
+		proto->request		= snap_request;
+		list_add_rcu(&proto->node, &snap_list);
+	}
+out:
+	spin_unlock_bh(&snap_lock);
+
+	synchronize_net();
+	return proto;
+}
+
+/*
+ *	Unregister SNAP clients. Protocols no longer want to play with us ...
+ */
+void unregister_snap_client(struct datalink_proto *proto)
+{
+	spin_lock_bh(&snap_lock);
+	list_del_rcu(&proto->node);
+	spin_unlock_bh(&snap_lock);
+
+	synchronize_net();
+
+	kfree(proto);
+}
+
+MODULE_LICENSE("GPL");
diff --git a/net/802/sysctl_net_802.c b/net/802/sysctl_net_802.c
new file mode 100644
index 00000000000..36079630c49
--- /dev/null
+++ b/net/802/sysctl_net_802.c
@@ -0,0 +1,33 @@
+/* -*- linux-c -*-
+ *		sysctl_net_802.c: sysctl interface to net 802 subsystem.
+ *
+ *		Begun April 1, 1996, Mike Shaver.
+ *		Added /proc/sys/net/802 directory entry (empty =) ). [MS]
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/mm.h>
+#include <linux/sysctl.h>
+#include <linux/config.h>
+
+#ifdef CONFIG_TR
+extern int sysctl_tr_rif_timeout;
+#endif
+
+struct ctl_table tr_table[] = {
+#ifdef CONFIG_TR
+	{
+		.ctl_name	= NET_TR_RIF_TIMEOUT,
+		.procname	= "rif_timeout",
+		.data		= &sysctl_tr_rif_timeout,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec
+	},
+#endif /* CONFIG_TR */
+	{ 0 },
+};
diff --git a/net/802/tr.c b/net/802/tr.c
new file mode 100644
index 00000000000..85293ccf7ef
--- /dev/null
+++ b/net/802/tr.c
@@ -0,0 +1,645 @@
+/*
+ * NET3:	Token ring device handling subroutines
+ * 
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Fixes:       3 Feb 97 Paul Norton <pnorton@cts.com> Minor routing fixes.
+ *              Added rif table to /proc/net/tr_rif and rif timeout to
+ *              /proc/sys/net/token-ring/rif_timeout.
+ *              22 Jun 98 Paul Norton <p.norton@computer.org> Rearranged
+ *              tr_header and tr_type_trans to handle passing IPX SNAP and
+ *              802.2 through the correct layers. Eliminated tr_reformat.
+ *        
+ */
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/trdevice.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/net.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <net/arp.h>
+
+static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev);
+static void rif_check_expire(unsigned long dummy);
+
+#define TR_SR_DEBUG 0
+
+/*
+ *	Each RIF entry we learn is kept this way
+ */
+ 
+struct rif_cache_s {	
+	unsigned char addr[TR_ALEN];
+	int iface;
+	__u16 rcf;
+	__u16 rseg[8];
+	struct rif_cache_s *next;
+	unsigned long last_used;
+	unsigned char local_ring;
+};
+
+#define RIF_TABLE_SIZE 32
+
+/*
+ *	We hash the RIF cache 32 ways. We do after all have to look it
+ *	up a lot.
+ */
+ 
+static struct rif_cache_s *rif_table[RIF_TABLE_SIZE];
+
+static DEFINE_SPINLOCK(rif_lock);
+
+
+/*
+ *	Garbage disposal timer.
+ */
+ 
+static struct timer_list rif_timer;
+
+int sysctl_tr_rif_timeout = 60*10*HZ;
+
+static inline unsigned long rif_hash(const unsigned char *addr)
+{
+	unsigned long x;
+
+	x = addr[0];
+	x = (x << 2) ^ addr[1];
+	x = (x << 2) ^ addr[2];
+	x = (x << 2) ^ addr[3];
+	x = (x << 2) ^ addr[4];
+	x = (x << 2) ^ addr[5];
+
+	x ^= x >> 8;
+
+	return x & (RIF_TABLE_SIZE - 1);
+}
+
+/*
+ *	Put the headers on a token ring packet. Token ring source routing
+ *	makes this a little more exciting than on ethernet.
+ */
+ 
+static int tr_header(struct sk_buff *skb, struct net_device *dev,
+		     unsigned short type,
+		     void *daddr, void *saddr, unsigned len) 
+{
+	struct trh_hdr *trh;
+	int hdr_len;
+
+	/* 
+	 * Add the 802.2 SNAP header if IP as the IPv4/IPv6 code calls  
+	 * dev->hard_header directly.
+	 */
+	if (type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
+	{
+		struct trllc *trllc;
+
+		hdr_len = sizeof(struct trh_hdr) + sizeof(struct trllc);
+		trh = (struct trh_hdr *)skb_push(skb, hdr_len);
+		trllc = (struct trllc *)(trh+1);
+		trllc->dsap = trllc->ssap = EXTENDED_SAP;
+		trllc->llc = UI_CMD;
+		trllc->protid[0] = trllc->protid[1] = trllc->protid[2] = 0x00;
+		trllc->ethertype = htons(type);
+	}
+	else
+	{
+		hdr_len = sizeof(struct trh_hdr);
+		trh = (struct trh_hdr *)skb_push(skb, hdr_len);	
+	}
+
+	trh->ac=AC;
+	trh->fc=LLC_FRAME;
+
+	if(saddr)
+		memcpy(trh->saddr,saddr,dev->addr_len);
+	else
+		memcpy(trh->saddr,dev->dev_addr,dev->addr_len);
+
+	/*
+	 *	Build the destination and then source route the frame
+	 */
+	 
+	if(daddr) 
+	{
+		memcpy(trh->daddr,daddr,dev->addr_len);
+		tr_source_route(skb,trh,dev);
+		return(hdr_len);
+	}
+
+	return -hdr_len;
+}
+	
+/*
+ *	A neighbour discovery of some species (eg arp) has completed. We
+ *	can now send the packet.
+ */
+ 
+static int tr_rebuild_header(struct sk_buff *skb) 
+{
+	struct trh_hdr *trh=(struct trh_hdr *)skb->data;
+	struct trllc *trllc=(struct trllc *)(skb->data+sizeof(struct trh_hdr));
+	struct net_device *dev = skb->dev;
+
+	/*
+	 *	FIXME: We don't yet support IPv6 over token rings
+	 */
+	 
+	if(trllc->ethertype != htons(ETH_P_IP)) {
+		printk("tr_rebuild_header: Don't know how to resolve type %04X addresses ?\n",(unsigned int)htons(trllc->ethertype));
+		return 0;
+	}
+
+#ifdef CONFIG_INET
+	if(arp_find(trh->daddr, skb)) {
+			return 1;
+	}
+	else 
+#endif	
+	{	
+		tr_source_route(skb,trh,dev); 
+		return 0;
+	}
+}
+	
+/*
+ *	Some of this is a bit hackish. We intercept RIF information
+ *	used for source routing. We also grab IP directly and don't feed
+ *	it via SNAP.
+ */
+ 
+unsigned short tr_type_trans(struct sk_buff *skb, struct net_device *dev) 
+{
+
+	struct trh_hdr *trh=(struct trh_hdr *)skb->data;
+	struct trllc *trllc;
+	unsigned riflen=0;
+	
+	skb->mac.raw = skb->data;
+	
+       	if(trh->saddr[0] & TR_RII)
+		riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
+
+	trllc = (struct trllc *)(skb->data+sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
+
+	skb_pull(skb,sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
+
+	if(*trh->daddr & 0x80) 
+	{
+		if(!memcmp(trh->daddr,dev->broadcast,TR_ALEN)) 	
+			skb->pkt_type=PACKET_BROADCAST;
+		else
+			skb->pkt_type=PACKET_MULTICAST;
+	}
+	else if ( (trh->daddr[0] & 0x01) && (trh->daddr[1] & 0x00) && (trh->daddr[2] & 0x5E))
+	{
+		skb->pkt_type=PACKET_MULTICAST;
+	}
+	else if(dev->flags & IFF_PROMISC) 
+	{
+		if(memcmp(trh->daddr, dev->dev_addr, TR_ALEN))
+			skb->pkt_type=PACKET_OTHERHOST;
+	}
+
+	if ((skb->pkt_type != PACKET_BROADCAST) &&
+	    (skb->pkt_type != PACKET_MULTICAST))
+		tr_add_rif_info(trh,dev) ; 
+
+	/*
+	 * Strip the SNAP header from ARP packets since we don't 
+	 * pass them through to the 802.2/SNAP layers.
+	 */
+
+	if (trllc->dsap == EXTENDED_SAP &&
+	    (trllc->ethertype == ntohs(ETH_P_IP) ||
+	     trllc->ethertype == ntohs(ETH_P_IPV6) ||
+	     trllc->ethertype == ntohs(ETH_P_ARP)))
+	{
+		skb_pull(skb, sizeof(struct trllc));
+		return trllc->ethertype;
+	}
+
+	return ntohs(ETH_P_802_2);
+}
+
+/*
+ *	We try to do source routing... 
+ */
+
+void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,struct net_device *dev) 
+{
+	int slack;
+	unsigned int hash;
+	struct rif_cache_s *entry;
+	unsigned char *olddata;
+	static const unsigned char mcast_func_addr[] 
+		= {0xC0,0x00,0x00,0x04,0x00,0x00};
+	
+	spin_lock_bh(&rif_lock);
+
+	/*
+	 *	Broadcasts are single route as stated in RFC 1042 
+	 */
+	if( (!memcmp(&(trh->daddr[0]),&(dev->broadcast[0]),TR_ALEN)) ||
+	    (!memcmp(&(trh->daddr[0]),&(mcast_func_addr[0]), TR_ALEN))  )
+	{
+		trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)  
+			       | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
+		trh->saddr[0]|=TR_RII;
+	}
+	else 
+	{
+		hash = rif_hash(trh->daddr);
+		/*
+		 *	Walk the hash table and look for an entry
+		 */
+		for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->daddr[0]),TR_ALEN);entry=entry->next);
+
+		/*
+		 *	If we found an entry we can route the frame.
+		 */
+		if(entry) 
+		{
+#if TR_SR_DEBUG
+printk("source routing for %02X:%02X:%02X:%02X:%02X:%02X\n",trh->daddr[0],
+		  trh->daddr[1],trh->daddr[2],trh->daddr[3],trh->daddr[4],trh->daddr[5]);
+#endif
+			if(!entry->local_ring && (ntohs(entry->rcf) & TR_RCF_LEN_MASK) >> 8)
+			{
+				trh->rcf=entry->rcf;
+				memcpy(&trh->rseg[0],&entry->rseg[0],8*sizeof(unsigned short));
+				trh->rcf^=htons(TR_RCF_DIR_BIT);	
+				trh->rcf&=htons(0x1fff);	/* Issam Chehab <ichehab@madge1.demon.co.uk> */
+
+				trh->saddr[0]|=TR_RII;
+#if TR_SR_DEBUG
+				printk("entry found with rcf %04x\n", entry->rcf);
+			}
+			else
+			{
+				printk("entry found but without rcf length, local=%02x\n", entry->local_ring);
+#endif
+			}
+			entry->last_used=jiffies;
+		}
+		else 
+		{
+			/*
+			 *	Without the information we simply have to shout
+			 *	on the wire. The replies should rapidly clean this
+			 *	situation up.
+			 */
+			trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)  
+				       | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
+			trh->saddr[0]|=TR_RII;
+#if TR_SR_DEBUG
+			printk("no entry in rif table found - broadcasting frame\n");
+#endif
+		}
+	}
+
+	/* Compress the RIF here so we don't have to do it in the driver(s) */
+	if (!(trh->saddr[0] & 0x80))
+		slack = 18;
+	else 
+		slack = 18 - ((ntohs(trh->rcf) & TR_RCF_LEN_MASK)>>8);
+	olddata = skb->data;
+	spin_unlock_bh(&rif_lock);
+
+	skb_pull(skb, slack);
+	memmove(skb->data, olddata, sizeof(struct trh_hdr) - slack);
+}
+
+/*
+ *	We have learned some new RIF information for our source
+ *	routing.
+ */
+ 
+static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev)
+{
+	unsigned int hash, rii_p = 0;
+	struct rif_cache_s *entry;
+
+
+	spin_lock_bh(&rif_lock);
+	
+	/*
+	 *	Firstly see if the entry exists
+	 */
+
+       	if(trh->saddr[0] & TR_RII)
+	{
+		trh->saddr[0]&=0x7f;
+		if (((ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8) > 2)
+		{
+			rii_p = 1;
+	        }
+	}
+
+	hash = rif_hash(trh->saddr);
+	for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);entry=entry->next);
+
+	if(entry==NULL) 
+	{
+#if TR_SR_DEBUG
+printk("adding rif_entry: addr:%02X:%02X:%02X:%02X:%02X:%02X rcf:%04X\n",
+		trh->saddr[0],trh->saddr[1],trh->saddr[2],
+       		trh->saddr[3],trh->saddr[4],trh->saddr[5],
+		ntohs(trh->rcf));
+#endif
+		/*
+		 *	Allocate our new entry. A failure to allocate loses
+		 *	use the information. This is harmless.
+		 *
+		 *	FIXME: We ought to keep some kind of cache size
+		 *	limiting and adjust the timers to suit.
+		 */
+		entry=kmalloc(sizeof(struct rif_cache_s),GFP_ATOMIC);
+
+		if(!entry) 
+		{
+			printk(KERN_DEBUG "tr.c: Couldn't malloc rif cache entry !\n");
+			spin_unlock_bh(&rif_lock);
+			return;
+		}
+
+		memcpy(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);
+		entry->iface = dev->ifindex;
+		entry->next=rif_table[hash];
+		entry->last_used=jiffies;
+		rif_table[hash]=entry;
+
+		if (rii_p)
+		{
+			entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
+			memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
+			entry->local_ring = 0;
+			trh->saddr[0]|=TR_RII; /* put the routing indicator back for tcpdump */
+		}
+		else
+		{
+			entry->local_ring = 1;
+		}
+	} 	
+	else	/* Y. Tahara added */
+	{ 
+		/*
+		 *	Update existing entries
+		 */
+		if (!entry->local_ring) 
+		    if (entry->rcf != (trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK)) &&
+			 !(trh->rcf & htons(TR_RCF_BROADCAST_MASK)))
+		    {
+#if TR_SR_DEBUG
+printk("updating rif_entry: addr:%02X:%02X:%02X:%02X:%02X:%02X rcf:%04X\n",
+		trh->saddr[0],trh->saddr[1],trh->saddr[2],
+		trh->saddr[3],trh->saddr[4],trh->saddr[5],
+		ntohs(trh->rcf));
+#endif
+			    entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
+        		    memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
+		    }                                         
+           	entry->last_used=jiffies;               
+	}
+	spin_unlock_bh(&rif_lock);
+}
+
+/*
+ *	Scan the cache with a timer and see what we need to throw out.
+ */
+
+static void rif_check_expire(unsigned long dummy) 
+{
+	int i;
+	unsigned long next_interval = jiffies + sysctl_tr_rif_timeout/2;
+
+	spin_lock_bh(&rif_lock);
+	
+	for(i =0; i < RIF_TABLE_SIZE; i++) {
+		struct rif_cache_s *entry, **pentry;
+		
+		pentry = rif_table+i;
+		while((entry=*pentry) != NULL) {
+			unsigned long expires
+				= entry->last_used + sysctl_tr_rif_timeout;
+
+			if (time_before_eq(expires, jiffies)) {
+				*pentry = entry->next;
+				kfree(entry);
+			} else {
+				pentry = &entry->next;
+
+				if (time_before(expires, next_interval))
+					next_interval = expires;
+			}
+		}
+	}
+	
+	spin_unlock_bh(&rif_lock);
+
+	mod_timer(&rif_timer, next_interval);
+
+}
+
+/*
+ *	Generate the /proc/net information for the token ring RIF
+ *	routing.
+ */
+ 
+#ifdef CONFIG_PROC_FS
+
+static struct rif_cache_s *rif_get_idx(loff_t pos)
+{
+	int i;
+	struct rif_cache_s *entry;
+	loff_t off = 0;
+
+	for(i = 0; i < RIF_TABLE_SIZE; i++) 
+		for(entry = rif_table[i]; entry; entry = entry->next) {
+			if (off == pos)
+				return entry;
+			++off;
+		}
+
+	return NULL;
+}
+
+static void *rif_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	spin_lock_bh(&rif_lock);
+
+	return *pos ? rif_get_idx(*pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *rif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	int i;
+	struct rif_cache_s *ent = v;
+
+	++*pos;
+
+	if (v == SEQ_START_TOKEN) {
+		i = -1;
+		goto scan;
+	}
+
+	if (ent->next) 
+		return ent->next;
+
+	i = rif_hash(ent->addr);
+ scan:
+	while (++i < RIF_TABLE_SIZE) {
+		if ((ent = rif_table[i]) != NULL)
+			return ent;
+	}
+	return NULL;
+}
+
+static void rif_seq_stop(struct seq_file *seq, void *v)
+{
+	spin_unlock_bh(&rif_lock);
+}
+
+static int rif_seq_show(struct seq_file *seq, void *v)
+{
+	int j, rcf_len, segment, brdgnmb;
+	struct rif_cache_s *entry = v;
+
+	if (v == SEQ_START_TOKEN)
+		seq_puts(seq,
+		     "if     TR address       TTL   rcf   routing segments\n");
+	else {
+		struct net_device *dev = dev_get_by_index(entry->iface);
+		long ttl = (long) (entry->last_used + sysctl_tr_rif_timeout)
+				- (long) jiffies;
+
+		seq_printf(seq, "%s %02X:%02X:%02X:%02X:%02X:%02X %7li ",
+			   dev?dev->name:"?",
+			   entry->addr[0],entry->addr[1],entry->addr[2],
+			   entry->addr[3],entry->addr[4],entry->addr[5],
+			   ttl/HZ);
+
+			if (entry->local_ring)
+			        seq_puts(seq, "local\n");
+			else {
+
+				seq_printf(seq, "%04X", ntohs(entry->rcf));
+				rcf_len = ((ntohs(entry->rcf) & TR_RCF_LEN_MASK)>>8)-2; 
+				if (rcf_len)
+				        rcf_len >>= 1;
+				for(j = 1; j < rcf_len; j++) {
+					if(j==1) {
+						segment=ntohs(entry->rseg[j-1])>>4;
+						seq_printf(seq,"  %03X",segment);
+					};
+					segment=ntohs(entry->rseg[j])>>4;
+					brdgnmb=ntohs(entry->rseg[j-1])&0x00f;
+					seq_printf(seq,"-%01X-%03X",brdgnmb,segment);
+				}
+				seq_putc(seq, '\n');
+			}
+	   	}
+	return 0;
+}
+
+
+static struct seq_operations rif_seq_ops = {
+	.start = rif_seq_start,
+	.next  = rif_seq_next,
+	.stop  = rif_seq_stop,
+	.show  = rif_seq_show,
+};
+
+static int rif_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &rif_seq_ops);
+}
+
+static struct file_operations rif_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open    = rif_seq_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+};
+
+#endif
+
+static void tr_setup(struct net_device *dev)
+{
+	/*
+	 *	Configure and register
+	 */
+	
+	dev->hard_header	= tr_header;
+	dev->rebuild_header	= tr_rebuild_header;
+
+	dev->type		= ARPHRD_IEEE802_TR;
+	dev->hard_header_len	= TR_HLEN;
+	dev->mtu		= 2000;
+	dev->addr_len		= TR_ALEN;
+	dev->tx_queue_len	= 100;	/* Long queues on tr */
+	
+	memset(dev->broadcast,0xFF, TR_ALEN);
+
+	/* New-style flags. */
+	dev->flags		= IFF_BROADCAST | IFF_MULTICAST ;
+}
+
+/**
+ * alloc_trdev - Register token ring device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ *	for this token ring device
+ *
+ * Fill in the fields of the device structure with token ring-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+struct net_device *alloc_trdev(int sizeof_priv)
+{
+	return alloc_netdev(sizeof_priv, "tr%d", tr_setup);
+}
+
+/*
+ *	Called during bootup.  We don't actually have to initialise
+ *	too much for this.
+ */
+
+static int __init rif_init(void)
+{
+	init_timer(&rif_timer);
+	rif_timer.expires  = sysctl_tr_rif_timeout;
+	rif_timer.data     = 0L;
+	rif_timer.function = rif_check_expire;
+	add_timer(&rif_timer);
+
+	proc_net_fops_create("tr_rif", S_IRUGO, &rif_seq_fops);
+	return 0;
+}
+
+module_init(rif_init);
+
+EXPORT_SYMBOL(tr_source_route);
+EXPORT_SYMBOL(tr_type_trans);
+EXPORT_SYMBOL(alloc_trdev);