openwrt-xburst/target/linux/linux-2.6/patches/generic/104-pf_ring.patch

diff --unified --recursive --new-file linux-2.6.12.5/include/linux/ring.h linux-2.6.12.5-1-686-smp-ring3/include/linux/ring.h
--- linux-2.6.12.5/include/linux/ring.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.12.5-1-686-smp-ring3/include/linux/ring.h	2005-10-22 23:50:44.951445250 +0200
@@ -0,0 +1,108 @@
+/*
+ * Definitions for packet ring
+ *
+ * 2004 - Luca Deri <deri@ntop.org>
+ */
+#ifndef __RING_H
+#define __RING_H
+
+
+#define INCLUDE_MAC_INFO
+
+#ifdef INCLUDE_MAC_INFO
+#define SKB_DISPLACEMENT    14 /* Include MAC address information */
+#else
+#define SKB_DISPLACEMENT    0  /* Do NOT include MAC address information */
+#endif
+
+#define RING_MAGIC
+#define RING_MAGIC_VALUE      0x88
+#define RING_FLOWSLOT_VERSION    5
+#define RING_VERSION          "3.0"
+
+#define SO_ADD_TO_CLUSTER        99
+#define SO_REMOVE_FROM_CLUSTER  100
+#define SO_SET_REFLECTOR        101
+
+/* *********************************** */
+
+#ifndef HAVE_PCAP
+struct pcap_pkthdr {
+  struct timeval ts;    /* time stamp */
+  u_int32_t caplen;     /* length of portion present */
+  u_int32_t len;        /* length this packet (off wire) */
+};
+#endif
+
+/* *********************************** */
+
+enum cluster_type {
+  cluster_per_flow = 0,
+  cluster_round_robin
+};
+
+/* *********************************** */
+
+#define RING_MIN_SLOT_SIZE    (60+sizeof(struct pcap_pkthdr))
+#define RING_MAX_SLOT_SIZE    (1514+sizeof(struct pcap_pkthdr))
+
+/* *********************************** */
+
+typedef struct flowSlotInfo {
+  u_int16_t version, sample_rate;
+  u_int32_t tot_slots, slot_len, tot_mem;
+  
+  u_int64_t tot_pkts, tot_lost;
+  u_int64_t tot_insert, tot_read;  
+  u_int16_t insert_idx;
+  u_int16_t remove_idx;
+} FlowSlotInfo;
+
+/* *********************************** */
+
+typedef struct flowSlot {
+#ifdef RING_MAGIC
+  u_char     magic;      /* It must alwasy be zero */
+#endif
+  u_char     slot_state; /* 0=empty, 1=full   */
+  u_char     bucket;     /* bucket[bucketLen] */
+} FlowSlot;
+
+/* *********************************** */
+
+#ifdef __KERNEL__ 
+
+FlowSlotInfo* getRingPtr(void);
+int allocateRing(char *deviceName, u_int numSlots,
+		 u_int bucketLen, u_int sampleRate);
+unsigned int pollRing(struct file *fp, struct poll_table_struct * wait);
+void deallocateRing(void);
+
+/* ************************* */
+
+typedef int (*handle_ring_skb)(struct sk_buff *skb,
+			       u_char recv_packet, u_char real_skb);
+extern handle_ring_skb get_skb_ring_handler(void);
+extern void set_skb_ring_handler(handle_ring_skb the_handler);
+extern void do_skb_ring_handler(struct sk_buff *skb,
+				u_char recv_packet, u_char real_skb);
+
+typedef int (*handle_ring_buffer)(struct net_device *dev, 
+				     char *data, int len);
+extern handle_ring_buffer get_buffer_ring_handler(void);
+extern void set_buffer_ring_handler(handle_ring_buffer the_handler);
+extern int do_buffer_ring_handler(struct net_device *dev,
+				  char *data, int len);
+#endif /* __KERNEL__  */
+
+/* *********************************** */
+
+#define PF_RING          27      /* Packet Ring */
+#define SOCK_RING        PF_RING
+
+/* ioctl() */
+#define SIORINGPOLL      0x8888
+
+/* *********************************** */
+
+#endif /* __RING_H */
diff --unified --recursive --new-file linux-2.6.12.5/net/Kconfig linux-2.6.12.5-1-686-smp-ring3/net/Kconfig
--- linux-2.6.12.5/net/Kconfig	2005-08-15 02:20:18.000000000 +0200
+++ linux-2.6.12.5-1-686-smp-ring3/net/Kconfig	2005-10-22 23:50:45.535481750 +0200
@@ -72,6 +72,7 @@
 
 	  Say Y unless you know what you are doing.
 
+source "net/ring/Kconfig"
 config INET
 	bool "TCP/IP networking"
 	---help---
diff --unified --recursive --new-file linux-2.6.12.5/net/Makefile linux-2.6.12.5-1-686-smp-ring3/net/Makefile
--- linux-2.6.12.5/net/Makefile	2005-08-15 02:20:18.000000000 +0200
+++ linux-2.6.12.5-1-686-smp-ring3/net/Makefile	2005-10-22 23:50:45.491479000 +0200
@@ -41,6 +41,7 @@
 obj-$(CONFIG_DECNET)		+= decnet/
 obj-$(CONFIG_ECONET)		+= econet/
 obj-$(CONFIG_VLAN_8021Q)	+= 8021q/
+obj-$(CONFIG_RING)		+= ring/
 obj-$(CONFIG_IP_SCTP)		+= sctp/
 
 ifeq ($(CONFIG_NET),y)
diff --unified --recursive --new-file linux-2.6.12.5/net/Makefile.ORG linux-2.6.12.5-1-686-smp-ring3/net/Makefile.ORG
--- linux-2.6.12.5/net/Makefile.ORG	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.12.5-1-686-smp-ring3/net/Makefile.ORG	2005-10-22 23:50:45.483478500 +0200
@@ -0,0 +1,48 @@
+#
+# Makefile for the linux networking.
+#
+# 2 Sep 2000, Christoph Hellwig <hch@infradead.org>
+# Rewritten to use lists instead of if-statements.
+#
+
+obj-y	:= nonet.o
+
+obj-$(CONFIG_NET)		:= socket.o core/
+
+tmp-$(CONFIG_COMPAT) 		:= compat.o
+obj-$(CONFIG_NET)		+= $(tmp-y)
+
+# LLC has to be linked before the files in net/802/
+obj-$(CONFIG_LLC)		+= llc/
+obj-$(CONFIG_NET)		+= ethernet/ 802/ sched/ netlink/
+obj-$(CONFIG_INET)		+= ipv4/
+obj-$(CONFIG_XFRM)		+= xfrm/
+obj-$(CONFIG_UNIX)		+= unix/
+ifneq ($(CONFIG_IPV6),)
+obj-y				+= ipv6/
+endif
+obj-$(CONFIG_PACKET)		+= packet/
+obj-$(CONFIG_NET_KEY)		+= key/
+obj-$(CONFIG_NET_SCHED)		+= sched/
+obj-$(CONFIG_BRIDGE)		+= bridge/
+obj-$(CONFIG_IPX)		+= ipx/
+obj-$(CONFIG_ATALK)		+= appletalk/
+obj-$(CONFIG_WAN_ROUTER)	+= wanrouter/
+obj-$(CONFIG_X25)		+= x25/
+obj-$(CONFIG_LAPB)		+= lapb/
+obj-$(CONFIG_NETROM)		+= netrom/
+obj-$(CONFIG_ROSE)		+= rose/
+obj-$(CONFIG_AX25)		+= ax25/
+obj-$(CONFIG_IRDA)		+= irda/
+obj-$(CONFIG_BT)		+= bluetooth/
+obj-$(CONFIG_SUNRPC)		+= sunrpc/
+obj-$(CONFIG_RXRPC)		+= rxrpc/
+obj-$(CONFIG_ATM)		+= atm/
+obj-$(CONFIG_DECNET)		+= decnet/
+obj-$(CONFIG_ECONET)		+= econet/
+obj-$(CONFIG_VLAN_8021Q)	+= 8021q/
+obj-$(CONFIG_IP_SCTP)		+= sctp/
+
+ifeq ($(CONFIG_NET),y)
+obj-$(CONFIG_SYSCTL)		+= sysctl_net.o
+endif
diff --unified --recursive --new-file linux-2.6.12.5/net/core/dev.c linux-2.6.12.5-1-686-smp-ring3/net/core/dev.c
--- linux-2.6.12.5/net/core/dev.c	2005-08-15 02:20:18.000000000 +0200
+++ linux-2.6.12.5-1-686-smp-ring3/net/core/dev.c	2005-10-22 23:50:45.479478250 +0200
@@ -115,6 +115,56 @@
 #endif	/* CONFIG_NET_RADIO */
 #include <asm/current.h>
 
+#if defined (CONFIG_RING) || defined(CONFIG_RING_MODULE)
+
+/* #define RING_DEBUG */
+
+#include <linux/ring.h>
+#include <linux/version.h>
+
+static handle_ring_skb ring_handler = NULL;
+
+handle_ring_skb get_skb_ring_handler() { return(ring_handler); }
+
+void set_skb_ring_handler(handle_ring_skb the_handler) {
+  ring_handler = the_handler;
+}
+
+void do_skb_ring_handler(struct sk_buff *skb,
+			 u_char recv_packet, u_char real_skb) {
+  if(ring_handler)
+    ring_handler(skb, recv_packet, real_skb);
+}
+
+/* ******************* */
+
+static handle_ring_buffer buffer_ring_handler = NULL;
+
+handle_ring_buffer get_buffer_ring_handler() { return(buffer_ring_handler); }
+
+void set_buffer_ring_handler(handle_ring_buffer the_handler) {
+  buffer_ring_handler = the_handler;
+}
+
+int do_buffer_ring_handler(struct net_device *dev, char *data, int len) {
+  if(buffer_ring_handler) {
+    buffer_ring_handler(dev, data, len);
+    return(1);
+  } else 
+    return(0);
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+EXPORT_SYMBOL(get_skb_ring_handler);
+EXPORT_SYMBOL(set_skb_ring_handler);
+EXPORT_SYMBOL(do_skb_ring_handler);
+
+EXPORT_SYMBOL(get_buffer_ring_handler);
+EXPORT_SYMBOL(set_buffer_ring_handler);
+EXPORT_SYMBOL(do_buffer_ring_handler);
+#endif
+
+#endif
 /* This define, if set, will randomly drop a packet when congestion
  * is more than moderate.  It helps fairness in the multi-interface
  * case when one of them is a hog, but it kills performance for the
@@ -1293,6 +1343,10 @@
 	skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
 #endif
 	if (q->enqueue) {
+#if defined (CONFIG_RING) || defined(CONFIG_RING_MODULE)
+	if(ring_handler) ring_handler(skb, 0, 1);
+#endif /* CONFIG_RING */
+
 		/* Grab device queue */
 		spin_lock(&dev->queue_lock);
 
@@ -1509,6 +1563,13 @@
 
 	preempt_disable();
 	err = netif_rx(skb);
+#if defined (CONFIG_RING) || defined(CONFIG_RING_MODULE)
+	if(ring_handler && ring_handler(skb, 1, 1)) {
+	  /* The packet has been copied into a ring */
+	  return(NET_RX_SUCCESS);
+	}
+#endif /* CONFIG_RING */
+
 	if (local_softirq_pending())
 		do_softirq();
 	preempt_enable();
@@ -1655,6 +1716,13 @@
 	int ret = NET_RX_DROP;
 	unsigned short type;
 
+#if defined (CONFIG_RING) || defined(CONFIG_RING_MODULE)
+	if(ring_handler && ring_handler(skb, 1, 1)) {
+	  /* The packet has been copied into a ring */
+	  return(NET_RX_SUCCESS);
+	}
+#endif /* CONFIG_RING */
+
 	/* if we've gotten here through NAPI, check netpoll */
 	if (skb->dev->poll && netpoll_rx(skb))
 		return NET_RX_DROP;
diff --unified --recursive --new-file linux-2.6.12.5/net/core/dev.c.ORG linux-2.6.12.5-1-686-smp-ring3/net/core/dev.c.ORG
--- linux-2.6.12.5/net/core/dev.c.ORG	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.12.5-1-686-smp-ring3/net/core/dev.c.ORG	2005-10-22 23:50:45.203461000 +0200
@@ -0,0 +1,3385 @@
+/*
+ * 	NET3	Protocol independent device support routines.
+ *
+ *		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.
+ *
+ *	Derived from the non IP parts of dev.c 1.0.19
+ * 		Authors:	Ross Biro
+ *				Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *				Mark Evans, <evansmp@uhura.aston.ac.uk>
+ *
+ *	Additional Authors:
+ *		Florian la Roche <rzsfl@rz.uni-sb.de>
+ *		Alan Cox <gw4pts@gw4pts.ampr.org>
+ *		David Hinds <dahinds@users.sourceforge.net>
+ *		Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ *		Adam Sulmicki <adam@cfar.umd.edu>
+ *              Pekka Riikonen <priikone@poesidon.pspt.fi>
+ *
+ *	Changes:
+ *              D.J. Barrow     :       Fixed bug where dev->refcnt gets set
+ *              			to 2 if register_netdev gets called
+ *              			before net_dev_init & also removed a
+ *              			few lines of code in the process.
+ *		Alan Cox	:	device private ioctl copies fields back.
+ *		Alan Cox	:	Transmit queue code does relevant
+ *					stunts to keep the queue safe.
+ *		Alan Cox	:	Fixed double lock.
+ *		Alan Cox	:	Fixed promisc NULL pointer trap
+ *		????????	:	Support the full private ioctl range
+ *		Alan Cox	:	Moved ioctl permission check into
+ *					drivers
+ *		Tim Kordas	:	SIOCADDMULTI/SIOCDELMULTI
+ *		Alan Cox	:	100 backlog just doesn't cut it when
+ *					you start doing multicast video 8)
+ *		Alan Cox	:	Rewrote net_bh and list manager.
+ *		Alan Cox	: 	Fix ETH_P_ALL echoback lengths.
+ *		Alan Cox	:	Took out transmit every packet pass
+ *					Saved a few bytes in the ioctl handler
+ *		Alan Cox	:	Network driver sets packet type before
+ *					calling netif_rx. Saves a function
+ *					call a packet.
+ *		Alan Cox	:	Hashed net_bh()
+ *		Richard Kooijman:	Timestamp fixes.
+ *		Alan Cox	:	Wrong field in SIOCGIFDSTADDR
+ *		Alan Cox	:	Device lock protection.
+ *		Alan Cox	: 	Fixed nasty side effect of device close
+ *					changes.
+ *		Rudi Cilibrasi	:	Pass the right thing to
+ *					set_mac_address()
+ *		Dave Miller	:	32bit quantity for the device lock to
+ *					make it work out on a Sparc.
+ *		Bjorn Ekwall	:	Added KERNELD hack.
+ *		Alan Cox	:	Cleaned up the backlog initialise.
+ *		Craig Metz	:	SIOCGIFCONF fix if space for under
+ *					1 device.
+ *	    Thomas Bogendoerfer :	Return ENODEV for dev_open, if there
+ *					is no device open function.
+ *		Andi Kleen	:	Fix error reporting for SIOCGIFCONF
+ *	    Michael Chastain	:	Fix signed/unsigned for SIOCGIFCONF
+ *		Cyrus Durgin	:	Cleaned for KMOD
+ *		Adam Sulmicki   :	Bug Fix : Network Device Unload
+ *					A network device unload needs to purge
+ *					the backlog queue.
+ *	Paul Rusty Russell	:	SIOCSIFNAME
+ *              Pekka Riikonen  :	Netdev boot-time settings code
+ *              Andrew Morton   :       Make unregister_netdevice wait
+ *              			indefinitely on dev->refcnt
+ * 		J Hadi Salim	:	- Backlog queue sampling
+ *				        - netif_rx() feedback
+ */
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/bitops.h>
+#include <linux/config.h>
+#include <linux/cpu.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/sockios.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/notifier.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+#include <linux/if_bridge.h>
+#include <linux/divert.h>
+#include <net/dst.h>
+#include <net/pkt_sched.h>
+#include <net/checksum.h>
+#include <linux/highmem.h>
+#include <linux/init.h>
+#include <linux/kmod.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/netpoll.h>
+#include <linux/rcupdate.h>
+#include <linux/delay.h>
+#ifdef CONFIG_NET_RADIO
+#include <linux/wireless.h>		/* Note : will define WIRELESS_EXT */
+#include <net/iw_handler.h>
+#endif	/* CONFIG_NET_RADIO */
+#include <asm/current.h>
+
+/* This define, if set, will randomly drop a packet when congestion
+ * is more than moderate.  It helps fairness in the multi-interface
+ * case when one of them is a hog, but it kills performance for the
+ * single interface case so it is off now by default.
+ */
+#undef RAND_LIE
+
+/* Setting this will sample the queue lengths and thus congestion
+ * via a timer instead of as each packet is received.
+ */
+#undef OFFLINE_SAMPLE
+
+/*
+ *	The list of packet types we will receive (as opposed to discard)
+ *	and the routines to invoke.
+ *
+ *	Why 16. Because with 16 the only overlap we get on a hash of the
+ *	low nibble of the protocol value is RARP/SNAP/X.25.
+ *
+ *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
+ *             sure which should go first, but I bet it won't make much
+ *             difference if we are running VLANs.  The good news is that
+ *             this protocol won't be in the list unless compiled in, so
+ *             the average user (w/out VLANs) will not be adversly affected.
+ *             --BLG
+ *
+ *		0800	IP
+ *		8100    802.1Q VLAN
+ *		0001	802.3
+ *		0002	AX.25
+ *		0004	802.2
+ *		8035	RARP
+ *		0005	SNAP
+ *		0805	X.25
+ *		0806	ARP
+ *		8137	IPX
+ *		0009	Localtalk
+ *		86DD	IPv6
+ */
+
+static DEFINE_SPINLOCK(ptype_lock);
+static struct list_head ptype_base[16];	/* 16 way hashed list */
+static struct list_head ptype_all;		/* Taps */
+
+#ifdef OFFLINE_SAMPLE
+static void sample_queue(unsigned long dummy);
+static struct timer_list samp_timer = TIMER_INITIALIZER(sample_queue, 0, 0);
+#endif
+
+/*
+ * The @dev_base list is protected by @dev_base_lock and the rtln
+ * semaphore.
+ *
+ * Pure readers hold dev_base_lock for reading.
+ *
+ * Writers must hold the rtnl semaphore while they loop through the
+ * dev_base list, and hold dev_base_lock for writing when they do the
+ * actual updates.  This allows pure readers to access the list even
+ * while a writer is preparing to update it.
+ *
+ * To put it another way, dev_base_lock is held for writing only to
+ * protect against pure readers; the rtnl semaphore provides the
+ * protection against other writers.
+ *
+ * See, for example usages, register_netdevice() and
+ * unregister_netdevice(), which must be called with the rtnl
+ * semaphore held.
+ */
+struct net_device *dev_base;
+static struct net_device **dev_tail = &dev_base;
+DEFINE_RWLOCK(dev_base_lock);
+
+EXPORT_SYMBOL(dev_base);
+EXPORT_SYMBOL(dev_base_lock);
+
+#define NETDEV_HASHBITS	8
+static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
+static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
+
+static inline struct hlist_head *dev_name_hash(const char *name)
+{
+	unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
+	return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
+}
+
+static inline struct hlist_head *dev_index_hash(int ifindex)
+{
+	return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
+}
+
+/*
+ *	Our notifier list
+ */
+
+static struct notifier_block *netdev_chain;
+
+/*
+ *	Device drivers call our routines to queue packets here. We empty the
+ *	queue in the local softnet handler.
+ */
+DEFINE_PER_CPU(struct softnet_data, softnet_data) = { 0, };
+
+#ifdef CONFIG_SYSFS
+extern int netdev_sysfs_init(void);
+extern int netdev_register_sysfs(struct net_device *);
+extern void netdev_unregister_sysfs(struct net_device *);
+#else
+#define netdev_sysfs_init()	 	(0)
+#define netdev_register_sysfs(dev)	(0)
+#define	netdev_unregister_sysfs(dev)	do { } while(0)
+#endif
+
+
+/*******************************************************************************
+
+		Protocol management and registration routines
+
+*******************************************************************************/
+
+/*
+ *	For efficiency
+ */
+
+int netdev_nit;
+
+/*
+ *	Add a protocol ID to the list. Now that the input handler is
+ *	smarter we can dispense with all the messy stuff that used to be
+ *	here.
+ *
+ *	BEWARE!!! Protocol handlers, mangling input packets,
+ *	MUST BE last in hash buckets and checking protocol handlers
+ *	MUST start from promiscuous ptype_all chain in net_bh.
+ *	It is true now, do not change it.
+ *	Explanation follows: if protocol handler, mangling packet, will
+ *	be the first on list, it is not able to sense, that packet
+ *	is cloned and should be copied-on-write, so that it will
+ *	change it and subsequent readers will get broken packet.
+ *							--ANK (980803)
+ */
+
+/**
+ *	dev_add_pack - add packet handler
+ *	@pt: packet type declaration
+ *
+ *	Add a protocol handler to the networking stack. The passed &packet_type
+ *	is linked into kernel lists and may not be freed until it has been
+ *	removed from the kernel lists.
+ *
+ *	This call does not sleep therefore it can not 
+ *	guarantee all CPU's that are in middle of receiving packets
+ *	will see the new packet type (until the next received packet).
+ */
+
+void dev_add_pack(struct packet_type *pt)
+{
+	int hash;
+
+	spin_lock_bh(&ptype_lock);
+	if (pt->type == htons(ETH_P_ALL)) {
+		netdev_nit++;
+		list_add_rcu(&pt->list, &ptype_all);
+	} else {
+		hash = ntohs(pt->type) & 15;
+		list_add_rcu(&pt->list, &ptype_base[hash]);
+	}
+	spin_unlock_bh(&ptype_lock);
+}
+
+extern void linkwatch_run_queue(void);
+
+
+
+/**
+ *	__dev_remove_pack	 - remove packet handler
+ *	@pt: packet type declaration
+ *
+ *	Remove a protocol handler that was previously added to the kernel
+ *	protocol handlers by dev_add_pack(). The passed &packet_type is removed
+ *	from the kernel lists and can be freed or reused once this function
+ *	returns. 
+ *
+ *      The packet type might still be in use by receivers
+ *	and must not be freed until after all the CPU's have gone
+ *	through a quiescent state.
+ */
+void __dev_remove_pack(struct packet_type *pt)
+{
+	struct list_head *head;
+	struct packet_type *pt1;
+
+	spin_lock_bh(&ptype_lock);
+
+	if (pt->type == htons(ETH_P_ALL)) {
+		netdev_nit--;
+		head = &ptype_all;
+	} else
+		head = &ptype_base[ntohs(pt->type) & 15];
+
+	list_for_each_entry(pt1, head, list) {
+		if (pt == pt1) {
+			list_del_rcu(&pt->list);
+			goto out;
+		}
+	}
+
+	printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
+out:
+	spin_unlock_bh(&ptype_lock);
+}
+/**
+ *	dev_remove_pack	 - remove packet handler
+ *	@pt: packet type declaration
+ *
+ *	Remove a protocol handler that was previously added to the kernel
+ *	protocol handlers by dev_add_pack(). The passed &packet_type is removed
+ *	from the kernel lists and can be freed or reused once this function
+ *	returns.
+ *
+ *	This call sleeps to guarantee that no CPU is looking at the packet
+ *	type after return.
+ */
+void dev_remove_pack(struct packet_type *pt)
+{
+	__dev_remove_pack(pt);
+	
+	synchronize_net();
+}
+
+/******************************************************************************
+
+		      Device Boot-time Settings Routines
+
+*******************************************************************************/
+
+/* Boot time configuration table */
+static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
+
+/**
+ *	netdev_boot_setup_add	- add new setup entry
+ *	@name: name of the device
+ *	@map: configured settings for the device
+ *
+ *	Adds new setup entry to the dev_boot_setup list.  The function
+ *	returns 0 on error and 1 on success.  This is a generic routine to
+ *	all netdevices.
+ */
+static int netdev_boot_setup_add(char *name, struct ifmap *map)
+{
+	struct netdev_boot_setup *s;
+	int i;
+
+	s = dev_boot_setup;
+	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
+		if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
+			memset(s[i].name, 0, sizeof(s[i].name));
+			strcpy(s[i].name, name);
+			memcpy(&s[i].map, map, sizeof(s[i].map));
+			break;
+		}
+	}
+
+	return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
+}
+
+/**
+ *	netdev_boot_setup_check	- check boot time settings
+ *	@dev: the netdevice
+ *
+ * 	Check boot time settings for the device.
+ *	The found settings are set for the device to be used
+ *	later in the device probing.
+ *	Returns 0 if no settings found, 1 if they are.
+ */
+int netdev_boot_setup_check(struct net_device *dev)
+{
+	struct netdev_boot_setup *s = dev_boot_setup;
+	int i;
+
+	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
+		if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
+		    !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
+			dev->irq 	= s[i].map.irq;
+			dev->base_addr 	= s[i].map.base_addr;
+			dev->mem_start 	= s[i].map.mem_start;
+			dev->mem_end 	= s[i].map.mem_end;
+			return 1;
+		}
+	}
+	return 0;
+}
+
+
+/**
+ *	netdev_boot_base	- get address from boot time settings
+ *	@prefix: prefix for network device
+ *	@unit: id for network device
+ *
+ * 	Check boot time settings for the base address of device.
+ *	The found settings are set for the device to be used
+ *	later in the device probing.
+ *	Returns 0 if no settings found.
+ */
+unsigned long netdev_boot_base(const char *prefix, int unit)
+{
+	const struct netdev_boot_setup *s = dev_boot_setup;
+	char name[IFNAMSIZ];
+	int i;
+
+	sprintf(name, "%s%d", prefix, unit);
+
+	/*
+	 * If device already registered then return base of 1
+	 * to indicate not to probe for this interface
+	 */
+	if (__dev_get_by_name(name))
+		return 1;
+
+	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
+		if (!strcmp(name, s[i].name))
+			return s[i].map.base_addr;
+	return 0;
+}
+
+/*
+ * Saves at boot time configured settings for any netdevice.
+ */
+int __init netdev_boot_setup(char *str)
+{
+	int ints[5];
+	struct ifmap map;
+
+	str = get_options(str, ARRAY_SIZE(ints), ints);
+	if (!str || !*str)
+		return 0;
+
+	/* Save settings */
+	memset(&map, 0, sizeof(map));
+	if (ints[0] > 0)
+		map.irq = ints[1];
+	if (ints[0] > 1)
+		map.base_addr = ints[2];
+	if (ints[0] > 2)
+		map.mem_start = ints[3];
+	if (ints[0] > 3)
+		map.mem_end = ints[4];
+
+	/* Add new entry to the list */
+	return netdev_boot_setup_add(str, &map);
+}
+
+__setup("netdev=", netdev_boot_setup);
+
+/*******************************************************************************
+
+			    Device Interface Subroutines
+
+*******************************************************************************/
+
+/**
+ *	__dev_get_by_name	- find a device by its name
+ *	@name: name to find
+ *
+ *	Find an interface by name. Must be called under RTNL semaphore
+ *	or @dev_base_lock. If the name is found a pointer to the device
+ *	is returned. If the name is not found then %NULL is returned. The
+ *	reference counters are not incremented so the caller must be
+ *	careful with locks.
+ */
+
+struct net_device *__dev_get_by_name(const char *name)
+{
+	struct hlist_node *p;
+
+	hlist_for_each(p, dev_name_hash(name)) {
+		struct net_device *dev
+			= hlist_entry(p, struct net_device, name_hlist);
+		if (!strncmp(dev->name, name, IFNAMSIZ))
+			return dev;
+	}
+	return NULL;
+}
+
+/**
+ *	dev_get_by_name		- find a device by its name
+ *	@name: name to find
+ *
+ *	Find an interface by name. This can be called from any
+ *	context and does its own locking. The returned handle has
+ *	the usage count incremented and the caller must use dev_put() to
+ *	release it when it is no longer needed. %NULL is returned if no
+ *	matching device is found.
+ */
+
+struct net_device *dev_get_by_name(const char *name)
+{
+	struct net_device *dev;
+
+	read_lock(&dev_base_lock);
+	dev = __dev_get_by_name(name);
+	if (dev)
+		dev_hold(dev);
+	read_unlock(&dev_base_lock);
+	return dev;
+}
+
+/**
+ *	__dev_get_by_index - find a device by its ifindex
+ *	@ifindex: index of device
+ *
+ *	Search for an interface by index. Returns %NULL if the device
+ *	is not found or a pointer to the device. The device has not
+ *	had its reference counter increased so the caller must be careful
+ *	about locking. The caller must hold either the RTNL semaphore
+ *	or @dev_base_lock.
+ */
+
+struct net_device *__dev_get_by_index(int ifindex)
+{
+	struct hlist_node *p;
+
+	hlist_for_each(p, dev_index_hash(ifindex)) {
+		struct net_device *dev
+			= hlist_entry(p, struct net_device, index_hlist);
+		if (dev->ifindex == ifindex)
+			return dev;
+	}
+	return NULL;
+}
+
+
+/**
+ *	dev_get_by_index - find a device by its ifindex
+ *	@ifindex: index of device
+ *
+ *	Search for an interface by index. Returns NULL if the device
+ *	is not found or a pointer to the device. The device returned has
+ *	had a reference added and the pointer is safe until the user calls
+ *	dev_put to indicate they have finished with it.
+ */
+
+struct net_device *dev_get_by_index(int ifindex)
+{
+	struct net_device *dev;
+
+	read_lock(&dev_base_lock);
+	dev = __dev_get_by_index(ifindex);
+	if (dev)
+		dev_hold(dev);
+	read_unlock(&dev_base_lock);
+	return dev;
+}
+
+/**
+ *	dev_getbyhwaddr - find a device by its hardware address
+ *	@type: media type of device
+ *	@ha: hardware address
+ *
+ *	Search for an interface by MAC address. Returns NULL if the device
+ *	is not found or a pointer to the device. The caller must hold the
+ *	rtnl semaphore. The returned device has not had its ref count increased
+ *	and the caller must therefore be careful about locking
+ *
+ *	BUGS:
+ *	If the API was consistent this would be __dev_get_by_hwaddr
+ */
+
+struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
+{
+	struct net_device *dev;
+
+	ASSERT_RTNL();
+
+	for (dev = dev_base; dev; dev = dev->next)
+		if (dev->type == type &&
+		    !memcmp(dev->dev_addr, ha, dev->addr_len))
+			break;
+	return dev;
+}
+
+struct net_device *dev_getfirstbyhwtype(unsigned short type)
+{
+	struct net_device *dev;
+
+	rtnl_lock();
+	for (dev = dev_base; dev; dev = dev->next) {
+		if (dev->type == type) {
+			dev_hold(dev);
+			break;
+		}
+	}
+	rtnl_unlock();
+	return dev;
+}
+
+EXPORT_SYMBOL(dev_getfirstbyhwtype);
+
+/**
+ *	dev_get_by_flags - find any device with given flags
+ *	@if_flags: IFF_* values
+ *	@mask: bitmask of bits in if_flags to check
+ *
+ *	Search for any interface with the given flags. Returns NULL if a device
+ *	is not found or a pointer to the device. The device returned has 
+ *	had a reference added and the pointer is safe until the user calls
+ *	dev_put to indicate they have finished with it.
+ */
+
+struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
+{
+	struct net_device *dev;
+
+	read_lock(&dev_base_lock);
+	for (dev = dev_base; dev != NULL; dev = dev->next) {
+		if (((dev->flags ^ if_flags) & mask) == 0) {
+			dev_hold(dev);
+			break;
+		}
+	}
+	read_unlock(&dev_base_lock);
+	return dev;
+}
+
+/**
+ *	dev_valid_name - check if name is okay for network device
+ *	@name: name string
+ *
+ *	Network device names need to be valid file names to
+ *	to allow sysfs to work
+ */
+static int dev_valid_name(const char *name)
+{
+	return !(*name == '\0' 
+		 || !strcmp(name, ".")
+		 || !strcmp(name, "..")
+		 || strchr(name, '/'));
+}
+
+/**
+ *	dev_alloc_name - allocate a name for a device
+ *	@dev: device
+ *	@name: name format string
+ *
+ *	Passed a format string - eg "lt%d" it will try and find a suitable
+ *	id. Not efficient for many devices, not called a lot. The caller
+ *	must hold the dev_base or rtnl lock while allocating the name and
+ *	adding the device in order to avoid duplicates. Returns the number
+ *	of the unit assigned or a negative errno code.
+ */
+
+int dev_alloc_name(struct net_device *dev, const char *name)
+{
+	int i = 0;
+	char buf[IFNAMSIZ];
+	const char *p;
+	const int max_netdevices = 8*PAGE_SIZE;
+	long *inuse;
+	struct net_device *d;
+
+	p = strnchr(name, IFNAMSIZ-1, '%');
+	if (p) {
+		/*
+		 * Verify the string as this thing may have come from
+		 * the user.  There must be either one "%d" and no other "%"
+		 * characters.
+		 */
+		if (p[1] != 'd' || strchr(p + 2, '%'))
+			return -EINVAL;
+
+		/* Use one page as a bit array of possible slots */
+		inuse = (long *) get_zeroed_page(GFP_ATOMIC);
+		if (!inuse)
+			return -ENOMEM;
+
+		for (d = dev_base; d; d = d->next) {
+			if (!sscanf(d->name, name, &i))
+				continue;
+			if (i < 0 || i >= max_netdevices)
+				continue;
+
+			/*  avoid cases where sscanf is not exact inverse of printf */
+			snprintf(buf, sizeof(buf), name, i);
+			if (!strncmp(buf, d->name, IFNAMSIZ))
+				set_bit(i, inuse);
+		}
+
+		i = find_first_zero_bit(inuse, max_netdevices);
+		free_page((unsigned long) inuse);
+	}
+
+	snprintf(buf, sizeof(buf), name, i);
+	if (!__dev_get_by_name(buf)) {
+		strlcpy(dev->name, buf, IFNAMSIZ);
+		return i;
+	}
+
+	/* It is possible to run out of possible slots
+	 * when the name is long and there isn't enough space left
+	 * for the digits, or if all bits are used.
+	 */
+	return -ENFILE;
+}
+
+
+/**
+ *	dev_change_name - change name of a device
+ *	@dev: device
+ *	@newname: name (or format string) must be at least IFNAMSIZ
+ *
+ *	Change name of a device, can pass format strings "eth%d".
+ *	for wildcarding.
+ */
+int dev_change_name(struct net_device *dev, char *newname)
+{
+	int err = 0;
+
+	ASSERT_RTNL();
+
+	if (dev->flags & IFF_UP)
+		return -EBUSY;
+
+	if (!dev_valid_name(newname))
+		return -EINVAL;
+
+	if (strchr(newname, '%')) {
+		err = dev_alloc_name(dev, newname);
+		if (err < 0)
+			return err;
+		strcpy(newname, dev->name);
+	}
+	else if (__dev_get_by_name(newname))
+		return -EEXIST;
+	else
+		strlcpy(dev->name, newname, IFNAMSIZ);
+
+	err = class_device_rename(&dev->class_dev, dev->name);
+	if (!err) {
+		hlist_del(&dev->name_hlist);
+		hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
+		notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
+	}
+
+	return err;
+}
+
+/**
+ *	netdev_features_change - device changes fatures
+ *	@dev: device to cause notification
+ *
+ *	Called to indicate a device has changed features.
+ */
+void netdev_features_change(struct net_device *dev)
+{
+	notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
+}
+EXPORT_SYMBOL(netdev_features_change);
+
+/**
+ *	netdev_state_change - device changes state
+ *	@dev: device to cause notification
+ *
+ *	Called to indicate a device has changed state. This function calls
+ *	the notifier chains for netdev_chain and sends a NEWLINK message
+ *	to the routing socket.
+ */
+void netdev_state_change(struct net_device *dev)
+{
+	if (dev->flags & IFF_UP) {
+		notifier_call_chain(&netdev_chain, NETDEV_CHANGE, dev);
+		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
+	}
+}
+
+/**
+ *	dev_load 	- load a network module
+ *	@name: name of interface
+ *
+ *	If a network interface is not present and the process has suitable
+ *	privileges this function loads the module. If module loading is not
+ *	available in this kernel then it becomes a nop.
+ */
+
+void dev_load(const char *name)
+{
+	struct net_device *dev;  
+
+	read_lock(&dev_base_lock);
+	dev = __dev_get_by_name(name);
+	read_unlock(&dev_base_lock);
+
+	if (!dev && capable(CAP_SYS_MODULE))
+		request_module("%s", name);
+}
+
+static int default_rebuild_header(struct sk_buff *skb)
+{
+	printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
+	       skb->dev ? skb->dev->name : "NULL!!!");
+	kfree_skb(skb);
+	return 1;
+}
+
+
+/**
+ *	dev_open	- prepare an interface for use.
+ *	@dev:	device to open
+ *
+ *	Takes a device from down to up state. The device's private open
+ *	function is invoked and then the multicast lists are loaded. Finally
+ *	the device is moved into the up state and a %NETDEV_UP message is
+ *	sent to the netdev notifier chain.
+ *
+ *	Calling this function on an active interface is a nop. On a failure
+ *	a negative errno code is returned.
+ */
+int dev_open(struct net_device *dev)
+{
+	int ret = 0;
+
+	/*
+	 *	Is it already up?
+	 */
+
+	if (dev->flags & IFF_UP)
+		return 0;
+
+	/*
+	 *	Is it even present?
+	 */
+	if (!netif_device_present(dev))
+		return -ENODEV;
+
+	/*
+	 *	Call device private open method
+	 */
+	set_bit(__LINK_STATE_START, &dev->state);
+	if (dev->open) {
+		ret = dev->open(dev);
+		if (ret)
+			clear_bit(__LINK_STATE_START, &dev->state);
+	}
+
+ 	/*
+	 *	If it went open OK then:
+	 */
+
+	if (!ret) {
+		/*
+		 *	Set the flags.
+		 */
+		dev->flags |= IFF_UP;
+
+		/*
+		 *	Initialize multicasting status
+		 */
+		dev_mc_upload(dev);
+
+		/*
+		 *	Wakeup transmit queue engine
+		 */
+		dev_activate(dev);
+
+		/*
+		 *	... and announce new interface.
+		 */
+		notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
+	}
+	return ret;
+}
+
+/**
+ *	dev_close - shutdown an interface.
+ *	@dev: device to shutdown
+ *
+ *	This function moves an active device into down state. A
+ *	%NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
+ *	is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
+ *	chain.
+ */
+int dev_close(struct net_device *dev)
+{
+	if (!(dev->flags & IFF_UP))
+		return 0;
+
+	/*
+	 *	Tell people we are going down, so that they can
+	 *	prepare to death, when device is still operating.
+	 */
+	notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
+
+	dev_deactivate(dev);
+
+	clear_bit(__LINK_STATE_START, &dev->state);
+
+	/* Synchronize to scheduled poll. We cannot touch poll list,
+	 * it can be even on different cpu. So just clear netif_running(),
+	 * and wait when poll really will happen. Actually, the best place
+	 * for this is inside dev->stop() after device stopped its irq
+	 * engine, but this requires more changes in devices. */
+
+	smp_mb__after_clear_bit(); /* Commit netif_running(). */
+	while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
+		/* No hurry. */
+		current->state = TASK_INTERRUPTIBLE;
+		schedule_timeout(1);
+	}
+
+	/*
+	 *	Call the device specific close. This cannot fail.
+	 *	Only if device is UP
+	 *
+	 *	We allow it to be called even after a DETACH hot-plug
+	 *	event.
+	 */
+	if (dev->stop)
+		dev->stop(dev);
+
+	/*
+	 *	Device is now down.
+	 */
+
+	dev->flags &= ~IFF_UP;
+
+	/*
+	 * Tell people we are down
+	 */
+	notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
+
+	return 0;
+}
+
+
+/*
+ *	Device change register/unregister. These are not inline or static
+ *	as we export them to the world.
+ */
+
+/**
+ *	register_netdevice_notifier - register a network notifier block
+ *	@nb: notifier
+ *
+ *	Register a notifier to be called when network device events occur.
+ *	The notifier passed is linked into the kernel structures and must
+ *	not be reused until it has been unregistered. A negative errno code
+ *	is returned on a failure.
+ *
+ * 	When registered all registration and up events are replayed
+ *	to the new notifier to allow device to have a race free 
+ *	view of the network device list.
+ */
+
+int register_netdevice_notifier(struct notifier_block *nb)
+{
+	struct net_device *dev;
+	int err;
+
+	rtnl_lock();
+	err = notifier_chain_register(&netdev_chain, nb);
+	if (!err) {
+		for (dev = dev_base; dev; dev = dev->next) {
+			nb->notifier_call(nb, NETDEV_REGISTER, dev);
+
+			if (dev->flags & IFF_UP) 
+				nb->notifier_call(nb, NETDEV_UP, dev);
+		}
+	}
+	rtnl_unlock();
+	return err;
+}
+
+/**
+ *	unregister_netdevice_notifier - unregister a network notifier block
+ *	@nb: notifier
+ *
+ *	Unregister a notifier previously registered by
+ *	register_netdevice_notifier(). The notifier is unlinked into the
+ *	kernel structures and may then be reused. A negative errno code
+ *	is returned on a failure.
+ */
+
+int unregister_netdevice_notifier(struct notifier_block *nb)
+{
+	return notifier_chain_unregister(&netdev_chain, nb);
+}
+
+/**
+ *	call_netdevice_notifiers - call all network notifier blocks
+ *      @val: value passed unmodified to notifier function
+ *      @v:   pointer passed unmodified to notifier function
+ *
+ *	Call all network notifier blocks.  Parameters and return value
+ *	are as for notifier_call_chain().
+ */
+
+int call_netdevice_notifiers(unsigned long val, void *v)
+{
+	return notifier_call_chain(&netdev_chain, val, v);
+}
+
+/* When > 0 there are consumers of rx skb time stamps */
+static atomic_t netstamp_needed = ATOMIC_INIT(0);
+
+void net_enable_timestamp(void)
+{
+	atomic_inc(&netstamp_needed);
+}
+
+void net_disable_timestamp(void)
+{
+	atomic_dec(&netstamp_needed);
+}
+
+static inline void net_timestamp(struct timeval *stamp)
+{
+	if (atomic_read(&netstamp_needed))
+		do_gettimeofday(stamp);
+	else {
+		stamp->tv_sec = 0;
+		stamp->tv_usec = 0;
+	}
+}
+
+/*
+ *	Support routine. Sends outgoing frames to any network
+ *	taps currently in use.
+ */
+
+void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct packet_type *ptype;
+	net_timestamp(&skb->stamp);
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(ptype, &ptype_all, list) {
+		/* Never send packets back to the socket
+		 * they originated from - MvS (miquels@drinkel.ow.org)
+		 */
+		if ((ptype->dev == dev || !ptype->dev) &&
+		    (ptype->af_packet_priv == NULL ||
+		     (struct sock *)ptype->af_packet_priv != skb->sk)) {
+			struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
+			if (!skb2)
+				break;
+
+			/* skb->nh should be correctly
+			   set by sender, so that the second statement is
+			   just protection against buggy protocols.
+			 */
+			skb2->mac.raw = skb2->data;
+
+			if (skb2->nh.raw < skb2->data ||
+			    skb2->nh.raw > skb2->tail) {
+				if (net_ratelimit())
+					printk(KERN_CRIT "protocol %04x is "
+					       "buggy, dev %s\n",
+					       skb2->protocol, dev->name);
+				skb2->nh.raw = skb2->data;
+			}
+
+			skb2->h.raw = skb2->nh.raw;
+			skb2->pkt_type = PACKET_OUTGOING;
+			ptype->func(skb2, skb->dev, ptype);
+		}
+	}
+	rcu_read_unlock();
+}
+
+/*
+ * Invalidate hardware checksum when packet is to be mangled, and
+ * complete checksum manually on outgoing path.
+ */
+int skb_checksum_help(struct sk_buff *skb, int inward)
+{
+	unsigned int csum;
+	int ret = 0, offset = skb->h.raw - skb->data;
+
+	if (inward) {
+		skb->ip_summed = CHECKSUM_NONE;
+		goto out;
+	}
+
+	if (skb_cloned(skb)) {
+		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
+		if (ret)
+			goto out;
+	}
+
+	if (offset > (int)skb->len)
+		BUG();
+	csum = skb_checksum(skb, offset, skb->len-offset, 0);
+
+	offset = skb->tail - skb->h.raw;
+	if (offset <= 0)
+		BUG();
+	if (skb->csum + 2 > offset)
+		BUG();
+
+	*(u16*)(skb->h.raw + skb->csum) = csum_fold(csum);
+	skb->ip_summed = CHECKSUM_NONE;
+out:	
+	return ret;
+}
+
+#ifdef CONFIG_HIGHMEM
+/* Actually, we should eliminate this check as soon as we know, that:
+ * 1. IOMMU is present and allows to map all the memory.
+ * 2. No high memory really exists on this machine.
+ */
+
+static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
+{
+	int i;
+
+	if (dev->features & NETIF_F_HIGHDMA)
+		return 0;
+
+	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
+		if (PageHighMem(skb_shinfo(skb)->frags[i].page))
+			return 1;
+
+	return 0;
+}
+#else
+#define illegal_highdma(dev, skb)	(0)
+#endif
+
+extern void skb_release_data(struct sk_buff *);
+
+/* Keep head the same: replace data */
+int __skb_linearize(struct sk_buff *skb, int gfp_mask)
+{
+	unsigned int size;
+	u8 *data;
+	long offset;
+	struct skb_shared_info *ninfo;
+	int headerlen = skb->data - skb->head;
+	int expand = (skb->tail + skb->data_len) - skb->end;
+
+	if (skb_shared(skb))
+		BUG();
+
+	if (expand <= 0)
+		expand = 0;
+
+	size = skb->end - skb->head + expand;
+	size = SKB_DATA_ALIGN(size);
+	data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);
+	if (!data)
+		return -ENOMEM;
+
+	/* Copy entire thing */
+	if (skb_copy_bits(skb, -headerlen, data, headerlen + skb->len))
+		BUG();
+
+	/* Set up shinfo */
+	ninfo = (struct skb_shared_info*)(data + size);
+	atomic_set(&ninfo->dataref, 1);
+	ninfo->tso_size = skb_shinfo(skb)->tso_size;
+	ninfo->tso_segs = skb_shinfo(skb)->tso_segs;
+	ninfo->nr_frags = 0;
+	ninfo->frag_list = NULL;
+
+	/* Offset between the two in bytes */
+	offset = data - skb->head;
+
+	/* Free old data. */
+	skb_release_data(skb);
+
+	skb->head = data;
+	skb->end  = data + size;
+
+	/* Set up new pointers */
+	skb->h.raw   += offset;
+	skb->nh.raw  += offset;
+	skb->mac.raw += offset;
+	skb->tail    += offset;
+	skb->data    += offset;
+
+	/* We are no longer a clone, even if we were. */
+	skb->cloned    = 0;
+
+	skb->tail     += skb->data_len;
+	skb->data_len  = 0;
+	return 0;
+}
+
+#define HARD_TX_LOCK(dev, cpu) {			\
+	if ((dev->features & NETIF_F_LLTX) == 0) {	\
+		spin_lock(&dev->xmit_lock);		\
+		dev->xmit_lock_owner = cpu;		\
+	}						\
+}
+
+#define HARD_TX_UNLOCK(dev) {				\
+	if ((dev->features & NETIF_F_LLTX) == 0) {	\
+		dev->xmit_lock_owner = -1;		\
+		spin_unlock(&dev->xmit_lock);		\
+	}						\
+}
+
+/**
+ *	dev_queue_xmit - transmit a buffer
+ *	@skb: buffer to transmit
+ *
+ *	Queue a buffer for transmission to a network device. The caller must
+ *	have set the device and priority and built the buffer before calling
+ *	this function. The function can be called from an interrupt.
+ *
+ *	A negative errno code is returned on a failure. A success does not
+ *	guarantee the frame will be transmitted as it may be dropped due
+ *	to congestion or traffic shaping.
+ *
+ * -----------------------------------------------------------------------------------
+ *      I notice this method can also return errors from the queue disciplines,
+ *      including NET_XMIT_DROP, which is a positive value.  So, errors can also
+ *      be positive.
+ *
+ *      Regardless of the return value, the skb is consumed, so it is currently
+ *      difficult to retry a send to this method.  (You can bump the ref count
+ *      before sending to hold a reference for retry if you are careful.)
+ *
+ *      When calling this method, interrupts MUST be enabled.  This is because
+ *      the BH enable code must have IRQs enabled so that it will not deadlock.
+ *          --BLG
+ */
+
+int dev_queue_xmit(struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	struct Qdisc *q;
+	int rc = -ENOMEM;
+
+	if (skb_shinfo(skb)->frag_list &&
+	    !(dev->features & NETIF_F_FRAGLIST) &&
+	    __skb_linearize(skb, GFP_ATOMIC))
+		goto out_kfree_skb;
+
+	/* Fragmented skb is linearized if device does not support SG,
+	 * or if at least one of fragments is in highmem and device
+	 * does not support DMA from it.
+	 */
+	if (skb_shinfo(skb)->nr_frags &&
+	    (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
+	    __skb_linearize(skb, GFP_ATOMIC))
+		goto out_kfree_skb;
+
+	/* If packet is not checksummed and device does not support
+	 * checksumming for this protocol, complete checksumming here.
+	 */
+	if (skb->ip_summed == CHECKSUM_HW &&
+	    (!(dev->features & (NETIF_F_HW_CSUM | NETIF_F_NO_CSUM)) &&
+	     (!(dev->features & NETIF_F_IP_CSUM) ||
+	      skb->protocol != htons(ETH_P_IP))))
+	      	if (skb_checksum_help(skb, 0))
+	      		goto out_kfree_skb;
+
+	/* Disable soft irqs for various locks below. Also 
+	 * stops preemption for RCU. 
+	 */
+	local_bh_disable(); 
+
+	/* Updates of qdisc are serialized by queue_lock. 
+	 * The struct Qdisc which is pointed to by qdisc is now a 
+	 * rcu structure - it may be accessed without acquiring 
+	 * a lock (but the structure may be stale.) The freeing of the
+	 * qdisc will be deferred until it's known that there are no 
+	 * more references to it.
+	 * 
+	 * If the qdisc has an enqueue function, we still need to 
+	 * hold the queue_lock before calling it, since queue_lock
+	 * also serializes access to the device queue.
+	 */
+
+	q = rcu_dereference(dev->qdisc);
+#ifdef CONFIG_NET_CLS_ACT
+	skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
+#endif
+	if (q->enqueue) {
+		/* Grab device queue */
+		spin_lock(&dev->queue_lock);
+
+		rc = q->enqueue(skb, q);
+
+		qdisc_run(dev);
+
+		spin_unlock(&dev->queue_lock);
+		rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
+		goto out;
+	}
+
+	/* The device has no queue. Common case for software devices:
+	   loopback, all the sorts of tunnels...
+
+	   Really, it is unlikely that xmit_lock protection is necessary here.
+	   (f.e. loopback and IP tunnels are clean ignoring statistics
+	   counters.)
+	   However, it is possible, that they rely on protection
+	   made by us here.
+
+	   Check this and shot the lock. It is not prone from deadlocks.
+	   Either shot noqueue qdisc, it is even simpler 8)
+	 */
+	if (dev->flags & IFF_UP) {
+		int cpu = smp_processor_id(); /* ok because BHs are off */
+
+		if (dev->xmit_lock_owner != cpu) {
+
+			HARD_TX_LOCK(dev, cpu);
+
+			if (!netif_queue_stopped(dev)) {
+				if (netdev_nit)
+					dev_queue_xmit_nit(skb, dev);
+
+				rc = 0;
+				if (!dev->hard_start_xmit(skb, dev)) {
+					HARD_TX_UNLOCK(dev);
+					goto out;
+				}
+			}
+			HARD_TX_UNLOCK(dev);
+			if (net_ratelimit())
+				printk(KERN_CRIT "Virtual device %s asks to "
+				       "queue packet!\n", dev->name);
+		} else {
+			/* Recursion is detected! It is possible,
+			 * unfortunately */
+			if (net_ratelimit())
+				printk(KERN_CRIT "Dead loop on virtual device "
+				       "%s, fix it urgently!\n", dev->name);
+		}
+	}
+
+	rc = -ENETDOWN;
+	local_bh_enable();
+
+out_kfree_skb:
+	kfree_skb(skb);
+	return rc;
+out:
+	local_bh_enable();
+	return rc;
+}
+
+
+/*=======================================================================
+			Receiver routines
+  =======================================================================*/
+
+int netdev_max_backlog = 300;
+int weight_p = 64;            /* old backlog weight */
+/* These numbers are selected based on intuition and some
+ * experimentatiom, if you have more scientific way of doing this
+ * please go ahead and fix things.
+ */
+int no_cong_thresh = 10;
+int no_cong = 20;
+int lo_cong = 100;
+int mod_cong = 290;
+
+DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
+
+
+static void get_sample_stats(int cpu)
+{
+#ifdef RAND_LIE
+	unsigned long rd;
+	int rq;
+#endif
+	struct softnet_data *sd = &per_cpu(softnet_data, cpu);
+	int blog = sd->input_pkt_queue.qlen;
+	int avg_blog = sd->avg_blog;
+
+	avg_blog = (avg_blog >> 1) + (blog >> 1);
+
+	if (avg_blog > mod_cong) {
+		/* Above moderate congestion levels. */
+		sd->cng_level = NET_RX_CN_HIGH;
+#ifdef RAND_LIE
+		rd = net_random();
+		rq = rd % netdev_max_backlog;
+		if (rq < avg_blog) /* unlucky bastard */
+			sd->cng_level = NET_RX_DROP;
+#endif
+	} else if (avg_blog > lo_cong) {
+		sd->cng_level = NET_RX_CN_MOD;
+#ifdef RAND_LIE
+		rd = net_random();
+		rq = rd % netdev_max_backlog;
+			if (rq < avg_blog) /* unlucky bastard */
+				sd->cng_level = NET_RX_CN_HIGH;
+#endif
+	} else if (avg_blog > no_cong)
+		sd->cng_level = NET_RX_CN_LOW;
+	else  /* no congestion */
+		sd->cng_level = NET_RX_SUCCESS;
+
+	sd->avg_blog = avg_blog;
+}
+
+#ifdef OFFLINE_SAMPLE
+static void sample_queue(unsigned long dummy)
+{
+/* 10 ms 0r 1ms -- i don't care -- JHS */
+	int next_tick = 1;
+	int cpu = smp_processor_id();
+
+	get_sample_stats(cpu);
+	next_tick += jiffies;
+	mod_timer(&samp_timer, next_tick);
+}
+#endif
+
+
+/**
+ *	netif_rx	-	post buffer to the network code
+ *	@skb: buffer to post
+ *
+ *	This function receives a packet from a device driver and queues it for
+ *	the upper (protocol) levels to process.  It always succeeds. The buffer
+ *	may be dropped during processing for congestion control or by the
+ *	protocol layers.
+ *
+ *	return values:
+ *	NET_RX_SUCCESS	(no congestion)
+ *	NET_RX_CN_LOW   (low congestion)
+ *	NET_RX_CN_MOD   (moderate congestion)
+ *	NET_RX_CN_HIGH  (high congestion)
+ *	NET_RX_DROP     (packet was dropped)
+ *
+ */
+
+int netif_rx(struct sk_buff *skb)
+{
+	int this_cpu;
+	struct softnet_data *queue;
+	unsigned long flags;
+
+	/* if netpoll wants it, pretend we never saw it */
+	if (netpoll_rx(skb))
+		return NET_RX_DROP;
+
+	if (!skb->stamp.tv_sec)
+		net_timestamp(&skb->stamp);
+
+	/*
+	 * The code is rearranged so that the path is the most
+	 * short when CPU is congested, but is still operating.
+	 */
+	local_irq_save(flags);
+	this_cpu = smp_processor_id();
+	queue = &__get_cpu_var(softnet_data);
+
+	__get_cpu_var(netdev_rx_stat).total++;
+	if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
+		if (queue->input_pkt_queue.qlen) {
+			if (queue->throttle)
+				goto drop;
+
+enqueue:
+			dev_hold(skb->dev);
+			__skb_queue_tail(&queue->input_pkt_queue, skb);
+#ifndef OFFLINE_SAMPLE
+			get_sample_stats(this_cpu);
+#endif
+			local_irq_restore(flags);
+			return queue->cng_level;
+		}
+
+		if (queue->throttle)
+			queue->throttle = 0;
+
+		netif_rx_schedule(&queue->backlog_dev);
+		goto enqueue;
+	}
+
+	if (!queue->throttle) {
+		queue->throttle = 1;
+		__get_cpu_var(netdev_rx_stat).throttled++;
+	}
+
+drop:
+	__get_cpu_var(netdev_rx_stat).dropped++;
+	local_irq_restore(flags);
+
+	kfree_skb(skb);
+	return NET_RX_DROP;
+}
+
+int netif_rx_ni(struct sk_buff *skb)
+{
+	int err;
+
+	preempt_disable();
+	err = netif_rx(skb);
+	if (local_softirq_pending())
+		do_softirq();
+	preempt_enable();
+
+	return err;
+}
+
+EXPORT_SYMBOL(netif_rx_ni);
+
+static __inline__ void skb_bond(struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+
+	if (dev->master) {
+		skb->real_dev = skb->dev;
+		skb->dev = dev->master;
+	}
+}
+
+static void net_tx_action(struct softirq_action *h)
+{
+	struct softnet_data *sd = &__get_cpu_var(softnet_data);
+
+	if (sd->completion_queue) {
+		struct sk_buff *clist;
+
+		local_irq_disable();
+		clist = sd->completion_queue;
+		sd->completion_queue = NULL;
+		local_irq_enable();
+
+		while (clist) {
+			struct sk_buff *skb = clist;
+			clist = clist->next;
+
+			BUG_TRAP(!atomic_read(&skb->users));
+			__kfree_skb(skb);
+		}
+	}
+
+	if (sd->output_queue) {
+		struct net_device *head;
+
+		local_irq_disable();
+		head = sd->output_queue;
+		sd->output_queue = NULL;
+		local_irq_enable();
+
+		while (head) {
+			struct net_device *dev = head;
+			head = head->next_sched;
+
+			smp_mb__before_clear_bit();
+			clear_bit(__LINK_STATE_SCHED, &dev->state);
+
+			if (spin_trylock(&dev->queue_lock)) {
+				qdisc_run(dev);
+				spin_unlock(&dev->queue_lock);
+			} else {
+				netif_schedule(dev);
+			}
+		}
+	}
+}
+
+static __inline__ int deliver_skb(struct sk_buff *skb,
+				  struct packet_type *pt_prev)
+{
+	atomic_inc(&skb->users);
+	return pt_prev->func(skb, skb->dev, pt_prev);
+}
+
+#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
+int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
+struct net_bridge;
+struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
+						unsigned char *addr);
+void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
+
+static __inline__ int handle_bridge(struct sk_buff **pskb,
+				    struct packet_type **pt_prev, int *ret)
+{
+	struct net_bridge_port *port;
+
+	if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
+	    (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
+		return 0;
+
+	if (*pt_prev) {
+		*ret = deliver_skb(*pskb, *pt_prev);
+		*pt_prev = NULL;
+	} 
+	
+	return br_handle_frame_hook(port, pskb);
+}
+#else
+#define handle_bridge(skb, pt_prev, ret)	(0)
+#endif
+
+#ifdef CONFIG_NET_CLS_ACT
+/* TODO: Maybe we should just force sch_ingress to be compiled in
+ * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
+ * a compare and 2 stores extra right now if we dont have it on
+ * but have CONFIG_NET_CLS_ACT
+ * NOTE: This doesnt stop any functionality; if you dont have 
+ * the ingress scheduler, you just cant add policies on ingress.
+ *
+ */
+static int ing_filter(struct sk_buff *skb) 
+{
+	struct Qdisc *q;
+	struct net_device *dev = skb->dev;
+	int result = TC_ACT_OK;
+	
+	if (dev->qdisc_ingress) {
+		__u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
+		if (MAX_RED_LOOP < ttl++) {
+			printk("Redir loop detected Dropping packet (%s->%s)\n",
+				skb->input_dev?skb->input_dev->name:"??",skb->dev->name);
+			return TC_ACT_SHOT;
+		}
+
+		skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
+
+		skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
+		if (NULL == skb->input_dev) {
+			skb->input_dev = skb->dev;
+			printk("ing_filter:  fixed  %s out %s\n",skb->input_dev->name,skb->dev->name);
+		}
+		spin_lock(&dev->ingress_lock);
+		if ((q = dev->qdisc_ingress) != NULL)
+			result = q->enqueue(skb, q);
+		spin_unlock(&dev->ingress_lock);
+
+	}
+
+	return result;
+}
+#endif
+
+int netif_receive_skb(struct sk_buff *skb)
+{
+	struct packet_type *ptype, *pt_prev;
+	int ret = NET_RX_DROP;
+	unsigned short type;
+
+	/* if we've gotten here through NAPI, check netpoll */
+	if (skb->dev->poll && netpoll_rx(skb))
+		return NET_RX_DROP;
+
+	if (!skb->stamp.tv_sec)
+		net_timestamp(&skb->stamp);
+
+	skb_bond(skb);
+
+	__get_cpu_var(netdev_rx_stat).total++;
+
+	skb->h.raw = skb->nh.raw = skb->data;
+	skb->mac_len = skb->nh.raw - skb->mac.raw;
+
+	pt_prev = NULL;
+
+	rcu_read_lock();
+
+#ifdef CONFIG_NET_CLS_ACT
+	if (skb->tc_verd & TC_NCLS) {
+		skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
+		goto ncls;
+	}
+#endif
+
+	list_for_each_entry_rcu(ptype, &ptype_all, list) {
+		if (!ptype->dev || ptype->dev == skb->dev) {
+			if (pt_prev) 
+				ret = deliver_skb(skb, pt_prev);
+			pt_prev = ptype;
+		}
+	}
+
+#ifdef CONFIG_NET_CLS_ACT
+	if (pt_prev) {
+		ret = deliver_skb(skb, pt_prev);
+		pt_prev = NULL; /* noone else should process this after*/
+	} else {
+		skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
+	}
+
+	ret = ing_filter(skb);
+
+	if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
+		kfree_skb(skb);
+		goto out;
+	}
+
+	skb->tc_verd = 0;
+ncls:
+#endif
+
+	handle_diverter(skb);
+
+	if (handle_bridge(&skb, &pt_prev, &ret))
+		goto out;
+
+	type = skb->protocol;
+	list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
+		if (ptype->type == type &&
+		    (!ptype->dev || ptype->dev == skb->dev)) {
+			if (pt_prev) 
+				ret = deliver_skb(skb, pt_prev);
+			pt_prev = ptype;
+		}
+	}
+
+	if (pt_prev) {
+		ret = pt_prev->func(skb, skb->dev, pt_prev);
+	} else {
+		kfree_skb(skb);
+		/* Jamal, now you will not able to escape explaining
+		 * me how you were going to use this. :-)
+		 */
+		ret = NET_RX_DROP;
+	}
+
+out:
+	rcu_read_unlock();
+	return ret;
+}
+
+static int process_backlog(struct net_device *backlog_dev, int *budget)
+{
+	int work = 0;
+	int quota = min(backlog_dev->quota, *budget);
+	struct softnet_data *queue = &__get_cpu_var(softnet_data);
+	unsigned long start_time = jiffies;
+
+	backlog_dev->weight = weight_p;
+	for (;;) {
+		struct sk_buff *skb;
+		struct net_device *dev;
+
+		local_irq_disable();
+		skb = __skb_dequeue(&queue->input_pkt_queue);
+		if (!skb)
+			goto job_done;
+		local_irq_enable();
+
+		dev = skb->dev;
+
+		netif_receive_skb(skb);
+
+		dev_put(dev);
+
+		work++;
+
+		if (work >= quota || jiffies - start_time > 1)
+			break;
+
+	}
+
+	backlog_dev->quota -= work;
+	*budget -= work;
+	return -1;
+
+job_done:
+	backlog_dev->quota -= work;
+	*budget -= work;
+
+	list_del(&backlog_dev->poll_list);
+	smp_mb__before_clear_bit();
+	netif_poll_enable(backlog_dev);
+
+	if (queue->throttle)
+		queue->throttle = 0;
+	local_irq_enable();
+	return 0;
+}
+
+static void net_rx_action(struct softirq_action *h)
+{
+	struct softnet_data *queue = &__get_cpu_var(softnet_data);
+	unsigned long start_time = jiffies;
+	int budget = netdev_max_backlog;
+
+	
+	local_irq_disable();
+
+	while (!list_empty(&queue->poll_list)) {
+		struct net_device *dev;
+
+		if (budget <= 0 || jiffies - start_time > 1)
+			goto softnet_break;
+
+		local_irq_enable();
+
+		dev = list_entry(queue->poll_list.next,
+				 struct net_device, poll_list);
+		netpoll_poll_lock(dev);
+
+		if (dev->quota <= 0 || dev->poll(dev, &budget)) {
+			netpoll_poll_unlock(dev);
+			local_irq_disable();
+			list_del(&dev->poll_list);
+			list_add_tail(&dev->poll_list, &queue->poll_list);
+			if (dev->quota < 0)
+				dev->quota += dev->weight;
+			else
+				dev->quota = dev->weight;
+		} else {
+			netpoll_poll_unlock(dev);
+			dev_put(dev);
+			local_irq_disable();
+		}
+	}
+out:
+	local_irq_enable();
+	return;
+
+softnet_break:
+	__get_cpu_var(netdev_rx_stat).time_squeeze++;
+	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
+	goto out;
+}
+
+static gifconf_func_t * gifconf_list [NPROTO];
+
+/**
+ *	register_gifconf	-	register a SIOCGIF handler
+ *	@family: Address family
+ *	@gifconf: Function handler
+ *
+ *	Register protocol dependent address dumping routines. The handler
+ *	that is passed must not be freed or reused until it has been replaced
+ *	by another handler.
+ */
+int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
+{
+	if (family >= NPROTO)
+		return -EINVAL;
+	gifconf_list[family] = gifconf;
+	return 0;
+}
+
+
+/*
+ *	Map an interface index to its name (SIOCGIFNAME)
+ */
+
+/*
+ *	We need this ioctl for efficient implementation of the
+ *	if_indextoname() function required by the IPv6 API.  Without
+ *	it, we would have to search all the interfaces to find a
+ *	match.  --pb
+ */
+
+static int dev_ifname(struct ifreq __user *arg)
+{
+	struct net_device *dev;
+	struct ifreq ifr;
+
+	/*
+	 *	Fetch the caller's info block.
+	 */
+
+	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
+		return -EFAULT;
+
+	read_lock(&dev_base_lock);
+	dev = __dev_get_by_index(ifr.ifr_ifindex);
+	if (!dev) {
+		read_unlock(&dev_base_lock);
+		return -ENODEV;
+	}
+
+	strcpy(ifr.ifr_name, dev->name);
+	read_unlock(&dev_base_lock);
+
+	if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
+		return -EFAULT;
+	return 0;
+}
+
+/*
+ *	Perform a SIOCGIFCONF call. This structure will change
+ *	size eventually, and there is nothing I can do about it.
+ *	Thus we will need a 'compatibility mode'.
+ */
+
+static int dev_ifconf(char __user *arg)
+{
+	struct ifconf ifc;
+	struct net_device *dev;
+	char __user *pos;
+	int len;
+	int total;
+	int i;
+
+	/*
+	 *	Fetch the caller's info block.
+	 */
+
+	if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
+		return -EFAULT;
+
+	pos = ifc.ifc_buf;
+	len = ifc.ifc_len;
+
+	/*
+	 *	Loop over the interfaces, and write an info block for each.
+	 */
+
+	total = 0;
+	for (dev = dev_base; dev; dev = dev->next) {
+		for (i = 0; i < NPROTO; i++) {
+			if (gifconf_list[i]) {
+				int done;
+				if (!pos)
+					done = gifconf_list[i](dev, NULL, 0);
+				else
+					done = gifconf_list[i](dev, pos + total,
+							       len - total);
+				if (done < 0)
+					return -EFAULT;
+				total += done;
+			}
+		}
+  	}
+
+	/*
+	 *	All done.  Write the updated control block back to the caller.
+	 */
+	ifc.ifc_len = total;
+
+	/*
+	 * 	Both BSD and Solaris return 0 here, so we do too.
+	 */
+	return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
+}
+
+#ifdef CONFIG_PROC_FS
+/*
+ *	This is invoked by the /proc filesystem handler to display a device
+ *	in detail.
+ */
+static __inline__ struct net_device *dev_get_idx(loff_t pos)
+{
+	struct net_device *dev;
+	loff_t i;
+
+	for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
+
+	return i == pos ? dev : NULL;
+}
+
+void *dev_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	read_lock(&dev_base_lock);
+	return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
+}
+
+void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	++*pos;
+	return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
+}
+
+void dev_seq_stop(struct seq_file *seq, void *v)
+{
+	read_unlock(&dev_base_lock);
+}
+
+static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
+{
+	if (dev->get_stats) {
+		struct net_device_stats *stats = dev->get_stats(dev);
+
+		seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
+				"%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
+			   dev->name, stats->rx_bytes, stats->rx_packets,
+			   stats->rx_errors,
+			   stats->rx_dropped + stats->rx_missed_errors,
+			   stats->rx_fifo_errors,
+			   stats->rx_length_errors + stats->rx_over_errors +
+			     stats->rx_crc_errors + stats->rx_frame_errors,
+			   stats->rx_compressed, stats->multicast,
+			   stats->tx_bytes, stats->tx_packets,
+			   stats->tx_errors, stats->tx_dropped,
+			   stats->tx_fifo_errors, stats->collisions,
+			   stats->tx_carrier_errors +
+			     stats->tx_aborted_errors +
+			     stats->tx_window_errors +
+			     stats->tx_heartbeat_errors,
+			   stats->tx_compressed);
+	} else
+		seq_printf(seq, "%6s: No statistics available.\n", dev->name);
+}
+
+/*
+ *	Called from the PROCfs module. This now uses the new arbitrary sized
+ *	/proc/net interface to create /proc/net/dev
+ */
+static int dev_seq_show(struct seq_file *seq, void *v)
+{
+	if (v == SEQ_START_TOKEN)
+		seq_puts(seq, "Inter-|   Receive                            "
+			      "                    |  Transmit\n"
+			      " face |bytes    packets errs drop fifo frame "
+			      "compressed multicast|bytes    packets errs "
+			      "drop fifo colls carrier compressed\n");
+	else
+		dev_seq_printf_stats(seq, v);
+	return 0;
+}
+
+static struct netif_rx_stats *softnet_get_online(loff_t *pos)
+{
+	struct netif_rx_stats *rc = NULL;
+
+	while (*pos < NR_CPUS)
+	       	if (cpu_online(*pos)) {
+			rc = &per_cpu(netdev_rx_stat, *pos);
+			break;
+		} else
+			++*pos;
+	return rc;
+}
+
+static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return softnet_get_online(pos);
+}
+
+static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	++*pos;
+	return softnet_get_online(pos);
+}
+
+static void softnet_seq_stop(struct seq_file *seq, void *v)
+{
+}
+
+static int softnet_seq_show(struct seq_file *seq, void *v)
+{
+	struct netif_rx_stats *s = v;
+
+	seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
+		   s->total, s->dropped, s->time_squeeze, s->throttled,
+		   s->fastroute_hit, s->fastroute_success, s->fastroute_defer,
+		   s->fastroute_deferred_out,
+#if 0
+		   s->fastroute_latency_reduction
+#else
+		   s->cpu_collision
+#endif
+		  );
+	return 0;
+}
+
+static struct seq_operations dev_seq_ops = {
+	.start = dev_seq_start,
+	.next  = dev_seq_next,
+	.stop  = dev_seq_stop,
+	.show  = dev_seq_show,
+};
+
+static int dev_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &dev_seq_ops);
+}
+
+static struct file_operations dev_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open    = dev_seq_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+};
+
+static struct seq_operations softnet_seq_ops = {
+	.start = softnet_seq_start,
+	.next  = softnet_seq_next,
+	.stop  = softnet_seq_stop,
+	.show  = softnet_seq_show,
+};
+
+static int softnet_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &softnet_seq_ops);
+}
+
+static struct file_operations softnet_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open    = softnet_seq_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+};
+
+#ifdef WIRELESS_EXT
+extern int wireless_proc_init(void);
+#else
+#define wireless_proc_init() 0
+#endif
+
+static int __init dev_proc_init(void)
+{
+	int rc = -ENOMEM;
+
+	if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
+		goto out;
+	if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
+		goto out_dev;
+	if (wireless_proc_init())
+		goto out_softnet;
+	rc = 0;
+out:
+	return rc;
+out_softnet:
+	proc_net_remove("softnet_stat");
+out_dev:
+	proc_net_remove("dev");
+	goto out;
+}
+#else
+#define dev_proc_init() 0
+#endif	/* CONFIG_PROC_FS */
+
+
+/**
+ *	netdev_set_master	-	set up master/slave pair
+ *	@slave: slave device
+ *	@master: new master device
+ *
+ *	Changes the master device of the slave. Pass %NULL to break the
+ *	bonding. The caller must hold the RTNL semaphore. On a failure
+ *	a negative errno code is returned. On success the reference counts
+ *	are adjusted, %RTM_NEWLINK is sent to the routing socket and the
+ *	function returns zero.
+ */
+int netdev_set_master(struct net_device *slave, struct net_device *master)
+{
+	struct net_device *old = slave->master;
+
+	ASSERT_RTNL();
+
+	if (master) {
+		if (old)
+			return -EBUSY;
+		dev_hold(master);
+	}
+
+	slave->master = master;
+	
+	synchronize_net();
+
+	if (old)
+		dev_put(old);
+
+	if (master)
+		slave->flags |= IFF_SLAVE;
+	else
+		slave->flags &= ~IFF_SLAVE;
+
+	rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
+	return 0;
+}
+
+/**
+ *	dev_set_promiscuity	- update promiscuity count on a device
+ *	@dev: device
+ *	@inc: modifier
+ *
+ *	Add or remove promsicuity from a device. While the count in the device
+ *	remains above zero the interface remains promiscuous. Once it hits zero
+ *	the device reverts back to normal filtering operation. A negative inc
+ *	value is used to drop promiscuity on the device.
+ */
+void dev_set_promiscuity(struct net_device *dev, int inc)
+{
+	unsigned short old_flags = dev->flags;
+
+	dev->flags |= IFF_PROMISC;
+	if ((dev->promiscuity += inc) == 0)
+		dev->flags &= ~IFF_PROMISC;
+	if (dev->flags ^ old_flags) {
+		dev_mc_upload(dev);
+		printk(KERN_INFO "device %s %s promiscuous mode\n",
+		       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
+		       					       "left");
+	}
+}
+
+/**
+ *	dev_set_allmulti	- update allmulti count on a device
+ *	@dev: device
+ *	@inc: modifier
+ *
+ *	Add or remove reception of all multicast frames to a device. While the
+ *	count in the device remains above zero the interface remains listening
+ *	to all interfaces. Once it hits zero the device reverts back to normal
+ *	filtering operation. A negative @inc value is used to drop the counter
+ *	when releasing a resource needing all multicasts.
+ */
+
+void dev_set_allmulti(struct net_device *dev, int inc)
+{
+	unsigned short old_flags = dev->flags;
+
+	dev->flags |= IFF_ALLMULTI;
+	if ((dev->allmulti += inc) == 0)
+		dev->flags &= ~IFF_ALLMULTI;
+	if (dev->flags ^ old_flags)
+		dev_mc_upload(dev);
+}
+
+unsigned dev_get_flags(const struct net_device *dev)
+{
+	unsigned flags;
+
+	flags = (dev->flags & ~(IFF_PROMISC |
+				IFF_ALLMULTI |
+				IFF_RUNNING)) | 
+		(dev->gflags & (IFF_PROMISC |
+				IFF_ALLMULTI));
+
+	if (netif_running(dev) && netif_carrier_ok(dev))
+		flags |= IFF_RUNNING;
+
+	return flags;
+}
+
+int dev_change_flags(struct net_device *dev, unsigned flags)
+{
+	int ret;
+	int old_flags = dev->flags;
+
+	/*
+	 *	Set the flags on our device.
+	 */
+
+	dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
+			       IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
+			       IFF_AUTOMEDIA)) |
+		     (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
+				    IFF_ALLMULTI));
+
+	/*
+	 *	Load in the correct multicast list now the flags have changed.
+	 */
+
+	dev_mc_upload(dev);
+
+	/*
+	 *	Have we downed the interface. We handle IFF_UP ourselves
+	 *	according to user attempts to set it, rather than blindly
+	 *	setting it.
+	 */
+
+	ret = 0;
+	if ((old_flags ^ flags) & IFF_UP) {	/* Bit is different  ? */
+		ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
+
+		if (!ret)
+			dev_mc_upload(dev);
+	}
+
+	if (dev->flags & IFF_UP &&
+	    ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
+					  IFF_VOLATILE)))
+		notifier_call_chain(&netdev_chain, NETDEV_CHANGE, dev);
+
+	if ((flags ^ dev->gflags) & IFF_PROMISC) {
+		int inc = (flags & IFF_PROMISC) ? +1 : -1;
+		dev->gflags ^= IFF_PROMISC;
+		dev_set_promiscuity(dev, inc);
+	}
+
+	/* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
+	   is important. Some (broken) drivers set IFF_PROMISC, when
+	   IFF_ALLMULTI is requested not asking us and not reporting.
+	 */
+	if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
+		int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
+		dev->gflags ^= IFF_ALLMULTI;
+		dev_set_allmulti(dev, inc);
+	}
+
+	if (old_flags ^ dev->flags)
+		rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
+
+	return ret;
+}
+
+int dev_set_mtu(struct net_device *dev, int new_mtu)
+{
+	int err;
+
+	if (new_mtu == dev->mtu)
+		return 0;
+
+	/*	MTU must be positive.	 */
+	if (new_mtu < 0)
+		return -EINVAL;
+
+	if (!netif_device_present(dev))
+		return -ENODEV;
+
+	err = 0;
+	if (dev->change_mtu)
+		err = dev->change_mtu(dev, new_mtu);
+	else
+		dev->mtu = new_mtu;
+	if (!err && dev->flags & IFF_UP)
+		notifier_call_chain(&netdev_chain,
+				    NETDEV_CHANGEMTU, dev);
+	return err;
+}
+
+int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
+{
+	int err;
+
+	if (!dev->set_mac_address)
+		return -EOPNOTSUPP;
+	if (sa->sa_family != dev->type)
+		return -EINVAL;
+	if (!netif_device_present(dev))
+		return -ENODEV;
+	err = dev->set_mac_address(dev, sa);
+	if (!err)
+		notifier_call_chain(&netdev_chain, NETDEV_CHANGEADDR, dev);
+	return err;
+}
+
+/*
+ *	Perform the SIOCxIFxxx calls.
+ */
+static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
+{
+	int err;
+	struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
+
+	if (!dev)
+		return -ENODEV;
+
+	switch (cmd) {
+		case SIOCGIFFLAGS:	/* Get interface flags */
+			ifr->ifr_flags = dev_get_flags(dev);
+			return 0;
+
+		case SIOCSIFFLAGS:	/* Set interface flags */
+			return dev_change_flags(dev, ifr->ifr_flags);
+
+		case SIOCGIFMETRIC:	/* Get the metric on the interface
+					   (currently unused) */
+			ifr->ifr_metric = 0;
+			return 0;
+
+		case SIOCSIFMETRIC:	/* Set the metric on the interface
+					   (currently unused) */
+			return -EOPNOTSUPP;
+
+		case SIOCGIFMTU:	/* Get the MTU of a device */
+			ifr->ifr_mtu = dev->mtu;
+			return 0;
+
+		case SIOCSIFMTU:	/* Set the MTU of a device */
+			return dev_set_mtu(dev, ifr->ifr_mtu);
+
+		case SIOCGIFHWADDR:
+			if (!dev->addr_len)
+				memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
+			else
+				memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
+				       min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
+			ifr->ifr_hwaddr.sa_family = dev->type;
+			return 0;
+
+		case SIOCSIFHWADDR:
+			return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
+
+		case SIOCSIFHWBROADCAST:
+			if (ifr->ifr_hwaddr.sa_family != dev->type)
+				return -EINVAL;
+			memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
+			       min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
+			notifier_call_chain(&netdev_chain,
+					    NETDEV_CHANGEADDR, dev);
+			return 0;
+
+		case SIOCGIFMAP:
+			ifr->ifr_map.mem_start = dev->mem_start;
+			ifr->ifr_map.mem_end   = dev->mem_end;
+			ifr->ifr_map.base_addr = dev->base_addr;
+			ifr->ifr_map.irq       = dev->irq;
+			ifr->ifr_map.dma       = dev->dma;
+			ifr->ifr_map.port      = dev->if_port;
+			return 0;
+
+		case SIOCSIFMAP:
+			if (dev->set_config) {
+				if (!netif_device_present(dev))
+					return -ENODEV;
+				return dev->set_config(dev, &ifr->ifr_map);
+			}
+			return -EOPNOTSUPP;
+
+		case SIOCADDMULTI:
+			if (!dev->set_multicast_list ||
+			    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
+				return -EINVAL;
+			if (!netif_device_present(dev))
+				return -ENODEV;
+			return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
+					  dev->addr_len, 1);
+
+		case SIOCDELMULTI:
+			if (!dev->set_multicast_list ||
+			    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
+				return -EINVAL;
+			if (!netif_device_present(dev))
+				return -ENODEV;
+			return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
+					     dev->addr_len, 1);
+
+		case SIOCGIFINDEX:
+			ifr->ifr_ifindex = dev->ifindex;
+			return 0;
+
+		case SIOCGIFTXQLEN:
+			ifr->ifr_qlen = dev->tx_queue_len;
+			return 0;
+
+		case SIOCSIFTXQLEN:
+			if (ifr->ifr_qlen < 0)
+				return -EINVAL;
+			dev->tx_queue_len = ifr->ifr_qlen;
+			return 0;
+
+		case SIOCSIFNAME:
+			ifr->ifr_newname[IFNAMSIZ-1] = '\0';
+			return dev_change_name(dev, ifr->ifr_newname);
+
+		/*
+		 *	Unknown or private ioctl
+		 */
+
+		default:
+			if ((cmd >= SIOCDEVPRIVATE &&
+			    cmd <= SIOCDEVPRIVATE + 15) ||
+			    cmd == SIOCBONDENSLAVE ||
+			    cmd == SIOCBONDRELEASE ||
+			    cmd == SIOCBONDSETHWADDR ||
+			    cmd == SIOCBONDSLAVEINFOQUERY ||
+			    cmd == SIOCBONDINFOQUERY ||
+			    cmd == SIOCBONDCHANGEACTIVE ||
+			    cmd == SIOCGMIIPHY ||
+			    cmd == SIOCGMIIREG ||
+			    cmd == SIOCSMIIREG ||
+			    cmd == SIOCBRADDIF ||
+			    cmd == SIOCBRDELIF ||
+			    cmd == SIOCWANDEV) {
+				err = -EOPNOTSUPP;
+				if (dev->do_ioctl) {
+					if (netif_device_present(dev))
+						err = dev->do_ioctl(dev, ifr,
+								    cmd);
+					else
+						err = -ENODEV;
+				}
+			} else
+				err = -EINVAL;
+
+	}
+	return err;
+}
+
+/*
+ *	This function handles all "interface"-type I/O control requests. The actual
+ *	'doing' part of this is dev_ifsioc above.
+ */
+
+/**
+ *	dev_ioctl	-	network device ioctl
+ *	@cmd: command to issue
+ *	@arg: pointer to a struct ifreq in user space
+ *
+ *	Issue ioctl functions to devices. This is normally called by the
+ *	user space syscall interfaces but can sometimes be useful for
+ *	other purposes. The return value is the return from the syscall if
+ *	positive or a negative errno code on error.
+ */
+
+int dev_ioctl(unsigned int cmd, void __user *arg)
+{
+	struct ifreq ifr;
+	int ret;
+	char *colon;
+
+	/* One special case: SIOCGIFCONF takes ifconf argument
+	   and requires shared lock, because it sleeps writing
+	   to user space.
+	 */
+
+	if (cmd == SIOCGIFCONF) {
+		rtnl_shlock();
+		ret = dev_ifconf((char __user *) arg);
+		rtnl_shunlock();
+		return ret;
+	}
+	if (cmd == SIOCGIFNAME)
+		return dev_ifname((struct ifreq __user *)arg);
+
+	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
+		return -EFAULT;
+
+	ifr.ifr_name[IFNAMSIZ-1] = 0;
+
+	colon = strchr(ifr.ifr_name, ':');
+	if (colon)
+		*colon = 0;
+
+	/*
+	 *	See which interface the caller is talking about.
+	 */
+
+	switch (cmd) {
+		/*
+		 *	These ioctl calls:
+		 *	- can be done by all.
+		 *	- atomic and do not require locking.
+		 *	- return a value
+		 */
+		case SIOCGIFFLAGS:
+		case SIOCGIFMETRIC:
+		case SIOCGIFMTU:
+		case SIOCGIFHWADDR:
+		case SIOCGIFSLAVE:
+		case SIOCGIFMAP:
+		case SIOCGIFINDEX:
+		case SIOCGIFTXQLEN:
+			dev_load(ifr.ifr_name);
+			read_lock(&dev_base_lock);
+			ret = dev_ifsioc(&ifr, cmd);
+			read_unlock(&dev_base_lock);
+			if (!ret) {
+				if (colon)
+					*colon = ':';
+				if (copy_to_user(arg, &ifr,
+						 sizeof(struct ifreq)))
+					ret = -EFAULT;
+			}
+			return ret;
+
+		case SIOCETHTOOL:
+			dev_load(ifr.ifr_name);
+			rtnl_lock();
+			ret = dev_ethtool(&ifr);
+			rtnl_unlock();
+			if (!ret) {
+				if (colon)
+					*colon = ':';
+				if (copy_to_user(arg, &ifr,
+						 sizeof(struct ifreq)))
+					ret = -EFAULT;
+			}
+			return ret;
+
+		/*
+		 *	These ioctl calls:
+		 *	- require superuser power.
+		 *	- require strict serialization.
+		 *	- return a value
+		 */
+		case SIOCGMIIPHY:
+		case SIOCGMIIREG:
+		case SIOCSIFNAME:
+			if (!capable(CAP_NET_ADMIN))
+				return -EPERM;
+			dev_load(ifr.ifr_name);
+			rtnl_lock();
+			ret = dev_ifsioc(&ifr, cmd);
+			rtnl_unlock();
+			if (!ret) {
+				if (colon)
+					*colon = ':';
+				if (copy_to_user(arg, &ifr,
+						 sizeof(struct ifreq)))
+					ret = -EFAULT;
+			}
+			return ret;
+
+		/*
+		 *	These ioctl calls:
+		 *	- require superuser power.
+		 *	- require strict serialization.
+		 *	- do not return a value
+		 */
+		case SIOCSIFFLAGS:
+		case SIOCSIFMETRIC:
+		case SIOCSIFMTU:
+		case SIOCSIFMAP:
+		case SIOCSIFHWADDR:
+		case SIOCSIFSLAVE:
+		case SIOCADDMULTI:
+		case SIOCDELMULTI:
+		case SIOCSIFHWBROADCAST:
+		case SIOCSIFTXQLEN:
+		case SIOCSMIIREG:
+		case SIOCBONDENSLAVE:
+		case SIOCBONDRELEASE:
+		case SIOCBONDSETHWADDR:
+		case SIOCBONDSLAVEINFOQUERY:
+		case SIOCBONDINFOQUERY:
+		case SIOCBONDCHANGEACTIVE:
+		case SIOCBRADDIF:
+		case SIOCBRDELIF:
+			if (!capable(CAP_NET_ADMIN))
+				return -EPERM;
+			dev_load(ifr.ifr_name);
+			rtnl_lock();
+			ret = dev_ifsioc(&ifr, cmd);
+			rtnl_unlock();
+			return ret;
+
+		case SIOCGIFMEM:
+			/* Get the per device memory space. We can add this but
+			 * currently do not support it */
+		case SIOCSIFMEM:
+			/* Set the per device memory buffer space.
+			 * Not applicable in our case */
+		case SIOCSIFLINK:
+			return -EINVAL;
+
+		/*
+		 *	Unknown or private ioctl.
+		 */
+		default:
+			if (cmd == SIOCWANDEV ||
+			    (cmd >= SIOCDEVPRIVATE &&
+			     cmd <= SIOCDEVPRIVATE + 15)) {
+				dev_load(ifr.ifr_name);
+				rtnl_lock();
+				ret = dev_ifsioc(&ifr, cmd);
+				rtnl_unlock();
+				if (!ret && copy_to_user(arg, &ifr,
+							 sizeof(struct ifreq)))
+					ret = -EFAULT;
+				return ret;
+			}
+#ifdef WIRELESS_EXT
+			/* Take care of Wireless Extensions */
+			if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
+				/* If command is `set a parameter', or
+				 * `get the encoding parameters', check if
+				 * the user has the right to do it */
+				if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE) {
+					if (!capable(CAP_NET_ADMIN))
+						return -EPERM;
+				}
+				dev_load(ifr.ifr_name);
+				rtnl_lock();
+				/* Follow me in net/core/wireless.c */
+				ret = wireless_process_ioctl(&ifr, cmd);
+				rtnl_unlock();
+				if (IW_IS_GET(cmd) &&
+				    copy_to_user(arg, &ifr,
+					    	 sizeof(struct ifreq)))
+					ret = -EFAULT;
+				return ret;
+			}
+#endif	/* WIRELESS_EXT */
+			return -EINVAL;
+	}
+}
+
+
+/**
+ *	dev_new_index	-	allocate an ifindex
+ *
+ *	Returns a suitable unique value for a new device interface
+ *	number.  The caller must hold the rtnl semaphore or the
+ *	dev_base_lock to be sure it remains unique.
+ */
+static int dev_new_index(void)
+{
+	static int ifindex;
+	for (;;) {
+		if (++ifindex <= 0)
+			ifindex = 1;
+		if (!__dev_get_by_index(ifindex))
+			return ifindex;
+	}
+}
+
+static int dev_boot_phase = 1;
+
+/* Delayed registration/unregisteration */
+static DEFINE_SPINLOCK(net_todo_list_lock);
+static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
+
+static inline void net_set_todo(struct net_device *dev)
+{
+	spin_lock(&net_todo_list_lock);
+	list_add_tail(&dev->todo_list, &net_todo_list);
+	spin_unlock(&net_todo_list_lock);
+}
+
+/**
+ *	register_netdevice	- register a network device
+ *	@dev: device to register
+ *
+ *	Take a completed network device structure and add it to the kernel
+ *	interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
+ *	chain. 0 is returned on success. A negative errno code is returned
+ *	on a failure to set up the device, or if the name is a duplicate.
+ *
+ *	Callers must hold the rtnl semaphore. You may want
+ *	register_netdev() instead of this.
+ *
+ *	BUGS:
+ *	The locking appears insufficient to guarantee two parallel registers
+ *	will not get the same name.
+ */
+
+int register_netdevice(struct net_device *dev)
+{
+	struct hlist_head *head;
+	struct hlist_node *p;
+	int ret;
+
+	BUG_ON(dev_boot_phase);
+	ASSERT_RTNL();
+
+	/* When net_device's are persistent, this will be fatal. */
+	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
+
+	spin_lock_init(&dev->queue_lock);
+	spin_lock_init(&dev->xmit_lock);
+	dev->xmit_lock_owner = -1;
+#ifdef CONFIG_NET_CLS_ACT
+	spin_lock_init(&dev->ingress_lock);
+#endif
+
+	ret = alloc_divert_blk(dev);
+	if (ret)
+		goto out;
+
+	dev->iflink = -1;
+
+	/* Init, if this function is available */
+	if (dev->init) {
+		ret = dev->init(dev);
+		if (ret) {
+			if (ret > 0)
+				ret = -EIO;
+			goto out_err;
+		}
+	}
+ 
+	if (!dev_valid_name(dev->name)) {
+		ret = -EINVAL;
+		goto out_err;
+	}
+
+	dev->ifindex = dev_new_index();
+	if (dev->iflink == -1)
+		dev->iflink = dev->ifindex;
+
+	/* Check for existence of name */
+	head = dev_name_hash(dev->name);
+	hlist_for_each(p, head) {
+		struct net_device *d
+			= hlist_entry(p, struct net_device, name_hlist);
+		if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
+			ret = -EEXIST;
+ 			goto out_err;
+		}
+ 	}
+
+	/* Fix illegal SG+CSUM combinations. */
+	if ((dev->features & NETIF_F_SG) &&
+	    !(dev->features & (NETIF_F_IP_CSUM |
+			       NETIF_F_NO_CSUM |
+			       NETIF_F_HW_CSUM))) {
+		printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
+		       dev->name);
+		dev->features &= ~NETIF_F_SG;
+	}
+
+	/* TSO requires that SG is present as well. */
+	if ((dev->features & NETIF_F_TSO) &&
+	    !(dev->features & NETIF_F_SG)) {
+		printk("%s: Dropping NETIF_F_TSO since no SG feature.\n",
+		       dev->name);
+		dev->features &= ~NETIF_F_TSO;
+	}
+
+	/*
+	 *	nil rebuild_header routine,
+	 *	that should be never called and used as just bug trap.
+	 */
+
+	if (!dev->rebuild_header)
+		dev->rebuild_header = default_rebuild_header;
+
+	/*
+	 *	Default initial state at registry is that the
+	 *	device is present.
+	 */
+
+	set_bit(__LINK_STATE_PRESENT, &dev->state);
+
+	dev->next = NULL;
+	dev_init_scheduler(dev);
+	write_lock_bh(&dev_base_lock);
+	*dev_tail = dev;
+	dev_tail = &dev->next;
+	hlist_add_head(&dev->name_hlist, head);
+	hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
+	dev_hold(dev);
+	dev->reg_state = NETREG_REGISTERING;
+	write_unlock_bh(&dev_base_lock);
+
+	/* Notify protocols, that a new device appeared. */
+	notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
+
+	/* Finish registration after unlock */
+	net_set_todo(dev);
+	ret = 0;
+
+out:
+	return ret;
+out_err:
+	free_divert_blk(dev);
+	goto out;
+}
+
+/**
+ *	register_netdev	- register a network device
+ *	@dev: device to register
+ *
+ *	Take a completed network device structure and add it to the kernel
+ *	interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
+ *	chain. 0 is returned on success. A negative errno code is returned
+ *	on a failure to set up the device, or if the name is a duplicate.
+ *
+ *	This is a wrapper around register_netdev that takes the rtnl semaphore
+ *	and expands the device name if you passed a format string to
+ *	alloc_netdev.
+ */
+int register_netdev(struct net_device *dev)
+{
+	int err;
+
+	rtnl_lock();
+
+	/*
+	 * If the name is a format string the caller wants us to do a
+	 * name allocation.
+	 */
+	if (strchr(dev->name, '%')) {
+		err = dev_alloc_name(dev, dev->name);
+		if (err < 0)
+			goto out;
+	}
+	
+	/*
+	 * Back compatibility hook. Kill this one in 2.5
+	 */
+	if (dev->name[0] == 0 || dev->name[0] == ' ') {
+		err = dev_alloc_name(dev, "eth%d");
+		if (err < 0)
+			goto out;
+	}
+
+	err = register_netdevice(dev);
+out:
+	rtnl_unlock();
+	return err;
+}
+EXPORT_SYMBOL(register_netdev);
+
+/*
+ * netdev_wait_allrefs - wait until all references are gone.
+ *
+ * This is called when unregistering network devices.
+ *
+ * Any protocol or device that holds a reference should register
+ * for netdevice notification, and cleanup and put back the
+ * reference if they receive an UNREGISTER event.
+ * We can get stuck here if buggy protocols don't correctly
+ * call dev_put. 
+ */
+static void netdev_wait_allrefs(struct net_device *dev)
+{
+	unsigned long rebroadcast_time, warning_time;
+
+	rebroadcast_time = warning_time = jiffies;
+	while (atomic_read(&dev->refcnt) != 0) {
+		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
+			rtnl_shlock();
+
+			/* Rebroadcast unregister notification */
+			notifier_call_chain(&netdev_chain,
+					    NETDEV_UNREGISTER, dev);
+
+			if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
+				     &dev->state)) {
+				/* We must not have linkwatch events
+				 * pending on unregister. If this
+				 * happens, we simply run the queue
+				 * unscheduled, resulting in a noop
+				 * for this device.
+				 */
+				linkwatch_run_queue();
+			}
+
+			rtnl_shunlock();
+
+			rebroadcast_time = jiffies;
+		}
+
+		msleep(250);
+
+		if (time_after(jiffies, warning_time + 10 * HZ)) {
+			printk(KERN_EMERG "unregister_netdevice: "
+			       "waiting for %s to become free. Usage "
+			       "count = %d\n",
+			       dev->name, atomic_read(&dev->refcnt));
+			warning_time = jiffies;
+		}
+	}
+}
+
+/* The sequence is:
+ *
+ *	rtnl_lock();
+ *	...
+ *	register_netdevice(x1);
+ *	register_netdevice(x2);
+ *	...
+ *	unregister_netdevice(y1);
+ *	unregister_netdevice(y2);
+ *      ...
+ *	rtnl_unlock();
+ *	free_netdev(y1);
+ *	free_netdev(y2);
+ *
+ * We are invoked by rtnl_unlock() after it drops the semaphore.
+ * This allows us to deal with problems:
+ * 1) We can create/delete sysfs objects which invoke hotplug
+ *    without deadlocking with linkwatch via keventd.
+ * 2) Since we run with the RTNL semaphore not held, we can sleep
+ *    safely in order to wait for the netdev refcnt to drop to zero.
+ */
+static DECLARE_MUTEX(net_todo_run_mutex);
+void netdev_run_todo(void)
+{
+	struct list_head list = LIST_HEAD_INIT(list);
+	int err;
+
+
+	/* Need to guard against multiple cpu's getting out of order. */
+	down(&net_todo_run_mutex);
+
+	/* Not safe to do outside the semaphore.  We must not return
+	 * until all unregister events invoked by the local processor
+	 * have been completed (either by this todo run, or one on
+	 * another cpu).
+	 */
+	if (list_empty(&net_todo_list))
+		goto out;
+
+	/* Snapshot list, allow later requests */
+	spin_lock(&net_todo_list_lock);
+	list_splice_init(&net_todo_list, &list);
+	spin_unlock(&net_todo_list_lock);
+		
+	while (!list_empty(&list)) {
+		struct net_device *dev
+			= list_entry(list.next, struct net_device, todo_list);
+		list_del(&dev->todo_list);
+
+		switch(dev->reg_state) {
+		case NETREG_REGISTERING:
+			err = netdev_register_sysfs(dev);
+			if (err)
+				printk(KERN_ERR "%s: failed sysfs registration (%d)\n",
+				       dev->name, err);
+			dev->reg_state = NETREG_REGISTERED;
+			break;
+
+		case NETREG_UNREGISTERING:
+			netdev_unregister_sysfs(dev);
+			dev->reg_state = NETREG_UNREGISTERED;
+
+			netdev_wait_allrefs(dev);
+
+			/* paranoia */
+			BUG_ON(atomic_read(&dev->refcnt));
+			BUG_TRAP(!dev->ip_ptr);
+			BUG_TRAP(!dev->ip6_ptr);
+			BUG_TRAP(!dev->dn_ptr);
+
+
+			/* It must be the very last action, 
+			 * after this 'dev' may point to freed up memory.
+			 */
+			if (dev->destructor)
+				dev->destructor(dev);
+			break;
+
+		default:
+			printk(KERN_ERR "network todo '%s' but state %d\n",
+			       dev->name, dev->reg_state);
+			break;
+		}
+	}
+
+out:
+	up(&net_todo_run_mutex);
+}
+
+/**
+ *	alloc_netdev - allocate network device
+ *	@sizeof_priv:	size of private data to allocate space for
+ *	@name:		device name format string
+ *	@setup:		callback to initialize device
+ *
+ *	Allocates a struct net_device with private data area for driver use
+ *	and performs basic initialization.
+ */
+struct net_device *alloc_netdev(int sizeof_priv, const char *name,
+		void (*setup)(struct net_device *))
+{
+	void *p;
+	struct net_device *dev;
+	int alloc_size;
+
+	/* ensure 32-byte alignment of both the device and private area */
+	alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
+	alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
+
+	p = kmalloc(alloc_size, GFP_KERNEL);
+	if (!p) {
+		printk(KERN_ERR "alloc_dev: Unable to allocate device.\n");
+		return NULL;
+	}
+	memset(p, 0, alloc_size);
+
+	dev = (struct net_device *)
+		(((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
+	dev->padded = (char *)dev - (char *)p;
+
+	if (sizeof_priv)
+		dev->priv = netdev_priv(dev);
+
+	setup(dev);
+	strcpy(dev->name, name);
+	return dev;
+}
+EXPORT_SYMBOL(alloc_netdev);
+
+/**
+ *	free_netdev - free network device
+ *	@dev: device
+ *
+ *	This function does the last stage of destroying an allocated device 
+ * 	interface. The reference to the device object is released.  
+ *	If this is the last reference then it will be freed.
+ */
+void free_netdev(struct net_device *dev)
+{
+#ifdef CONFIG_SYSFS
+	/*  Compatiablity with error handling in drivers */
+	if (dev->reg_state == NETREG_UNINITIALIZED) {
+		kfree((char *)dev - dev->padded);
+		return;
+	}
+
+	BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
+	dev->reg_state = NETREG_RELEASED;
+
+	/* will free via class release */
+	class_device_put(&dev->class_dev);
+#else
+	kfree((char *)dev - dev->padded);
+#endif
+}
+ 
+/* Synchronize with packet receive processing. */
+void synchronize_net(void) 
+{
+	might_sleep();
+	synchronize_rcu();
+}
+
+/**
+ *	unregister_netdevice - remove device from the kernel
+ *	@dev: device
+ *
+ *	This function shuts down a device interface and removes it
+ *	from the kernel tables. On success 0 is returned, on a failure
+ *	a negative errno code is returned.
+ *
+ *	Callers must hold the rtnl semaphore.  You may want
+ *	unregister_netdev() instead of this.
+ */
+
+int unregister_netdevice(struct net_device *dev)
+{
+	struct net_device *d, **dp;
+
+	BUG_ON(dev_boot_phase);
+	ASSERT_RTNL();
+
+	/* Some devices call without registering for initialization unwind. */
+	if (dev->reg_state == NETREG_UNINITIALIZED) {
+		printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
+				  "was registered\n", dev->name, dev);
+		return -ENODEV;
+	}
+
+	BUG_ON(dev->reg_state != NETREG_REGISTERED);
+
+	/* If device is running, close it first. */
+	if (dev->flags & IFF_UP)
+		dev_close(dev);
+
+	/* And unlink it from device chain. */
+	for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
+		if (d == dev) {
+			write_lock_bh(&dev_base_lock);
+			hlist_del(&dev->name_hlist);
+			hlist_del(&dev->index_hlist);
+			if (dev_tail == &dev->next)
+				dev_tail = dp;
+			*dp = d->next;
+			write_unlock_bh(&dev_base_lock);
+			break;
+		}
+	}
+	if (!d) {
+		printk(KERN_ERR "unregister net_device: '%s' not found\n",
+		       dev->name);
+		return -ENODEV;
+	}
+
+	dev->reg_state = NETREG_UNREGISTERING;
+
+	synchronize_net();
+
+	/* Shutdown queueing discipline. */
+	dev_shutdown(dev);
+
+	
+	/* Notify protocols, that we are about to destroy
+	   this device. They should clean all the things.
+	*/
+	notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
+	
+	/*
+	 *	Flush the multicast chain
+	 */
+	dev_mc_discard(dev);
+
+	if (dev->uninit)
+		dev->uninit(dev);
+
+	/* Notifier chain MUST detach us from master device. */
+	BUG_TRAP(!dev->master);
+
+	free_divert_blk(dev);
+
+	/* Finish processing unregister after unlock */
+	net_set_todo(dev);
+
+	synchronize_net();
+
+	dev_put(dev);
+	return 0;
+}
+
+/**
+ *	unregister_netdev - remove device from the kernel
+ *	@dev: device
+ *
+ *	This function shuts down a device interface and removes it
+ *	from the kernel tables. On success 0 is returned, on a failure
+ *	a negative errno code is returned.
+ *
+ *	This is just a wrapper for unregister_netdevice that takes
+ *	the rtnl semaphore.  In general you want to use this and not
+ *	unregister_netdevice.
+ */
+void unregister_netdev(struct net_device *dev)
+{
+	rtnl_lock();
+	unregister_netdevice(dev);
+	rtnl_unlock();
+}
+
+EXPORT_SYMBOL(unregister_netdev);
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int dev_cpu_callback(struct notifier_block *nfb,
+			    unsigned long action,
+			    void *ocpu)
+{
+	struct sk_buff **list_skb;
+	struct net_device **list_net;
+	struct sk_buff *skb;
+	unsigned int cpu, oldcpu = (unsigned long)ocpu;
+	struct softnet_data *sd, *oldsd;
+
+	if (action != CPU_DEAD)
+		return NOTIFY_OK;
+
+	local_irq_disable();
+	cpu = smp_processor_id();
+	sd = &per_cpu(softnet_data, cpu);
+	oldsd = &per_cpu(softnet_data, oldcpu);
+
+	/* Find end of our completion_queue. */
+	list_skb = &sd->completion_queue;
+	while (*list_skb)
+		list_skb = &(*list_skb)->next;
+	/* Append completion queue from offline CPU. */
+	*list_skb = oldsd->completion_queue;
+	oldsd->completion_queue = NULL;
+
+	/* Find end of our output_queue. */
+	list_net = &sd->output_queue;
+	while (*list_net)
+		list_net = &(*list_net)->next_sched;
+	/* Append output queue from offline CPU. */
+	*list_net = oldsd->output_queue;
+	oldsd->output_queue = NULL;
+
+	raise_softirq_irqoff(NET_TX_SOFTIRQ);
+	local_irq_enable();
+
+	/* Process offline CPU's input_pkt_queue */
+	while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
+		netif_rx(skb);
+
+	return NOTIFY_OK;
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+
+/*
+ *	Initialize the DEV module. At boot time this walks the device list and
+ *	unhooks any devices that fail to initialise (normally hardware not
+ *	present) and leaves us with a valid list of present and active devices.
+ *
+ */
+
+/*
+ *       This is called single threaded during boot, so no need
+ *       to take the rtnl semaphore.
+ */
+static int __init net_dev_init(void)
+{
+	int i, rc = -ENOMEM;
+
+	BUG_ON(!dev_boot_phase);
+
+	net_random_init();
+
+	if (dev_proc_init())
+		goto out;
+
+	if (netdev_sysfs_init())
+		goto out;
+
+	INIT_LIST_HEAD(&ptype_all);
+	for (i = 0; i < 16; i++) 
+		INIT_LIST_HEAD(&ptype_base[i]);
+
+	for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
+		INIT_HLIST_HEAD(&dev_name_head[i]);
+
+	for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
+		INIT_HLIST_HEAD(&dev_index_head[i]);
+
+	/*
+	 *	Initialise the packet receive queues.
+	 */
+
+	for (i = 0; i < NR_CPUS; i++) {
+		struct softnet_data *queue;
+
+		queue = &per_cpu(softnet_data, i);
+		skb_queue_head_init(&queue->input_pkt_queue);
+		queue->throttle = 0;
+		queue->cng_level = 0;
+		queue->avg_blog = 10; /* arbitrary non-zero */
+		queue->completion_queue = NULL;
+		INIT_LIST_HEAD(&queue->poll_list);
+		set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
+		queue->backlog_dev.weight = weight_p;
+		queue->backlog_dev.poll = process_backlog;
+		atomic_set(&queue->backlog_dev.refcnt, 1);
+	}
+
+#ifdef OFFLINE_SAMPLE
+	samp_timer.expires = jiffies + (10 * HZ);
+	add_timer(&samp_timer);
+#endif
+
+	dev_boot_phase = 0;
+
+	open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
+	open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
+
+	hotcpu_notifier(dev_cpu_callback, 0);
+	dst_init();
+	dev_mcast_init();
+	rc = 0;
+out:
+	return rc;
+}
+
+subsys_initcall(net_dev_init);
+
+EXPORT_SYMBOL(__dev_get_by_index);
+EXPORT_SYMBOL(__dev_get_by_name);
+EXPORT_SYMBOL(__dev_remove_pack);
+EXPORT_SYMBOL(__skb_linearize);
+EXPORT_SYMBOL(dev_add_pack);
+EXPORT_SYMBOL(dev_alloc_name);
+EXPORT_SYMBOL(dev_close);
+EXPORT_SYMBOL(dev_get_by_flags);
+EXPORT_SYMBOL(dev_get_by_index);
+EXPORT_SYMBOL(dev_get_by_name);
+EXPORT_SYMBOL(dev_ioctl);
+EXPORT_SYMBOL(dev_open);
+EXPORT_SYMBOL(dev_queue_xmit);
+EXPORT_SYMBOL(dev_remove_pack);
+EXPORT_SYMBOL(dev_set_allmulti);
+EXPORT_SYMBOL(dev_set_promiscuity);
+EXPORT_SYMBOL(dev_change_flags);
+EXPORT_SYMBOL(dev_set_mtu);
+EXPORT_SYMBOL(dev_set_mac_address);
+EXPORT_SYMBOL(free_netdev);
+EXPORT_SYMBOL(netdev_boot_setup_check);
+EXPORT_SYMBOL(netdev_set_master);
+EXPORT_SYMBOL(netdev_state_change);
+EXPORT_SYMBOL(netif_receive_skb);
+EXPORT_SYMBOL(netif_rx);
+EXPORT_SYMBOL(register_gifconf);
+EXPORT_SYMBOL(register_netdevice);
+EXPORT_SYMBOL(register_netdevice_notifier);
+EXPORT_SYMBOL(skb_checksum_help);
+EXPORT_SYMBOL(synchronize_net);
+EXPORT_SYMBOL(unregister_netdevice);
+EXPORT_SYMBOL(unregister_netdevice_notifier);
+EXPORT_SYMBOL(net_enable_timestamp);
+EXPORT_SYMBOL(net_disable_timestamp);
+EXPORT_SYMBOL(dev_get_flags);
+
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
+EXPORT_SYMBOL(br_handle_frame_hook);
+EXPORT_SYMBOL(br_fdb_get_hook);
+EXPORT_SYMBOL(br_fdb_put_hook);
+#endif
+
+#ifdef CONFIG_KMOD
+EXPORT_SYMBOL(dev_load);
+#endif
+
+EXPORT_PER_CPU_SYMBOL(softnet_data);
diff --unified --recursive --new-file linux-2.6.12.5/net/ring/Kconfig linux-2.6.12.5-1-686-smp-ring3/net/ring/Kconfig
--- linux-2.6.12.5/net/ring/Kconfig	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.12.5-1-686-smp-ring3/net/ring/Kconfig	2005-10-22 23:50:45.539482000 +0200
@@ -0,0 +1,14 @@
+config RING
+	tristate "PF_RING sockets (EXPERIMENTAL)"
+	depends on EXPERIMENTAL
+	---help---
+	  PF_RING socket family, optimized for packet capture.
+          If a PF_RING socket is bound to an adapter (via the bind() system
+          call), such adapter will be used in read-only mode until the socket
+          is destroyed. Whenever an incoming packet is received from the adapter
+          it will not passed to upper layers, but instead it is copied to a ring
+          buffer, which in turn is exported to user space applications via mmap.
+          Please refer to http://luca.ntop.org/Ring.pdf for more.
+
+	  Say N unless you know what you are doing.
+
diff --unified --recursive --new-file linux-2.6.12.5/net/ring/Makefile linux-2.6.12.5-1-686-smp-ring3/net/ring/Makefile
--- linux-2.6.12.5/net/ring/Makefile	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.12.5-1-686-smp-ring3/net/ring/Makefile	2005-10-22 23:50:45.051451500 +0200
@@ -0,0 +1,7 @@
+#
+# Makefile for the ring driver.
+#
+
+obj-m += ring.o
+
+ring-objs := ring_packet.o
diff --unified --recursive --new-file linux-2.6.12.5/net/ring/ring_packet.c linux-2.6.12.5-1-686-smp-ring3/net/ring/ring_packet.c
--- linux-2.6.12.5/net/ring/ring_packet.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.12.5-1-686-smp-ring3/net/ring/ring_packet.c	2005-10-22 23:50:45.159458250 +0200
@@ -0,0 +1,1592 @@
+/*
+ *
+ * (C) 2004-05 - Luca Deri <deri@ntop.org>
+ *
+ * This code includes patches courtesy of
+ * - Jeff Randall <jrandall@nexvu.com>
+ * - Helmut Manck <helmut.manck@secunet.com>
+ * - Brad Doctor <bdoctor@ps-ax.com>
+ *
+ */
+
+/* FIX: add an entry inside the /proc filesystem */
+
+#include <linux/version.h>
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/init.h>
+#include <linux/filter.h>
+#include <linux/ring.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/list.h>
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+#include <net/xfrm.h>
+#else
+#include <linux/poll.h>
+#endif
+#include <net/sock.h>
+#include <asm/io.h>   /* needed for virt_to_phys() */
+
+/* #define RING_DEBUG */
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,11))
+static inline int remap_page_range(struct vm_area_struct *vma,
+				   unsigned long uvaddr,
+				   unsigned long paddr,
+				   unsigned long size,
+				   pgprot_t prot) {
+  return(remap_pfn_range(vma, uvaddr, paddr >> PAGE_SHIFT,
+			 size, prot));
+}
+#endif
+
+/* ************************************************* */
+
+#define CLUSTER_LEN       8
+
+struct ring_cluster {
+  u_short             cluster_id; /* 0 = no cluster */
+  u_short             num_cluster_elements;
+  enum cluster_type   hashing_mode;
+  u_short             hashing_id;
+  struct sock         *sk[CLUSTER_LEN];
+  struct ring_cluster *next;      /* NULL = last element of the cluster */
+};
+
+/* ************************************************* */
+
+struct ring_element {
+  struct list_head  list;
+  struct sock      *sk;
+};
+
+/* ************************************************* */
+
+struct ring_opt {
+  struct net_device *ring_netdev;
+
+  /* Cluster */
+  u_short cluster_id; /* 0 = no cluster */
+
+  /* Reflector */
+  struct net_device *reflector_dev;
+
+  /* Packet buffers */
+  unsigned long order;
+
+  /* Ring Slots */
+  unsigned long ring_memory;
+  FlowSlotInfo *slots_info; /* Basically it points to ring_memory */
+  char *ring_slots;  /* Basically it points to ring_memory
+			+sizeof(FlowSlotInfo) */
+
+  /* Packet Sampling */
+  u_int pktToSample, sample_rate;
+
+  /* BPF Filter */
+  struct sk_filter *bpfFilter;
+
+  /* Locks */
+  atomic_t num_ring_slots_waiters;
+  wait_queue_head_t ring_slots_waitqueue;
+  rwlock_t ring_index_lock;
+
+  /* Indexes (Internal) */
+  u_int insert_page_id, insert_slot_id;
+};
+
+/* ************************************************* */
+
+/* List of all ring sockets. */
+static struct list_head ring_table;
+
+/* List of all clusters */
+static struct ring_cluster *ring_cluster_list;
+
+static rwlock_t ring_mgmt_lock = RW_LOCK_UNLOCKED;
+
+/* ********************************** */
+
+/* Forward */
+static struct proto_ops ring_ops;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,11))
+static struct proto ring_proto;
+#endif
+
+static int skb_ring_handler(struct sk_buff *skb, u_char recv_packet,
+			    u_char real_skb);
+static int buffer_ring_handler(struct net_device *dev, char *data, int len);
+static int remove_from_cluster(struct sock *sock, struct ring_opt *pfr);
+
+/* Extern */
+
+/* ********************************** */
+
+/* Defaults */
+static u_int bucket_len = 128, num_slots = 4096, sample_rate = 1,
+  transparent_mode = 0, enable_tx_capture = 0;
+
+MODULE_PARM(bucket_len, "i");
+MODULE_PARM_DESC(bucket_len, "Number of ring buckets");
+MODULE_PARM(num_slots,  "i");
+MODULE_PARM_DESC(num_slots,  "Number of ring slots");
+MODULE_PARM(sample_rate, "i");
+MODULE_PARM_DESC(sample_rate, "Ring packet sample rate");
+MODULE_PARM(transparent_mode, "i");
+MODULE_PARM_DESC(transparent_mode,
+		 "Set to 1 to set transparent mode "
+		 "(slower but backwards compatible)");
+MODULE_PARM(enable_tx_capture, "i");
+MODULE_PARM_DESC(enable_tx_capture, "Set to 1 to capture outgoing packets");
+
+/* ********************************** */
+
+#define MIN_QUEUED_PKTS      64
+#define MAX_QUEUE_LOOPS      64
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+#define ring_sk_datatype(__sk) ((struct ring_opt *)__sk)
+#define ring_sk(__sk) ((__sk)->sk_protinfo)
+#else
+#define ring_sk_datatype(a) (a)
+#define ring_sk(__sk) ((__sk)->protinfo.pf_ring)
+#endif
+
+/*
+  int dev_queue_xmit(struct sk_buff *skb)
+  skb->dev;
+  struct net_device *dev_get_by_name(const char *name)
+*/
+
+/* ********************************** */
+
+static void ring_sock_destruct(struct sock *sk) {
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+  skb_queue_purge(&sk->sk_receive_queue);
+
+  if (!sock_flag(sk, SOCK_DEAD)) {
+#if defined(RING_DEBUG)
+    printk("Attempt to release alive ring socket: %p\n", sk);
+#endif
+    return;
+  }
+
+  BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
+  BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
+#else
+
+  BUG_TRAP(atomic_read(&sk->rmem_alloc)==0);
+  BUG_TRAP(atomic_read(&sk->wmem_alloc)==0);
+
+  if (!sk->dead) {
+#if defined(RING_DEBUG)
+    printk("Attempt to release alive ring socket: %p\n", sk);
+#endif
+    return;
+  }
+#endif
+
+  kfree(ring_sk(sk));
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0))
+  MOD_DEC_USE_COUNT;
+#endif
+}
+
+/* ********************************** */
+/*
+ * ring_insert()
+ *
+ * store the sk in a new element and add it
+ * to the head of the list.
+ */
+static inline void ring_insert(struct sock *sk) {
+  struct ring_element *next;
+
+#if defined(RING_DEBUG)
+  printk("RING: ring_insert()\n");
+#endif
+
+  next = kmalloc(sizeof(struct ring_element), GFP_ATOMIC);
+  if(next != NULL) {
+    next->sk = sk;
+    write_lock_irq(&ring_mgmt_lock);
+    list_add(&next->list, &ring_table);
+    write_unlock_irq(&ring_mgmt_lock);
+  } else {
+    if (net_ratelimit())
+      printk("RING: could not kmalloc slot!!\n");
+  }
+}
+
+/* ********************************** */
+/*
+ * ring_remove()
+ *
+ * For each of the elements in the list:
+ *  - check if this is the element we want to delete
+ *  - if it is, remove it from the list, and free it.
+ *
+ * stop when we find the one we're looking for (break),
+ * or when we reach the end of the list.
+ */
+static inline void ring_remove(struct sock *sk) {
+  struct list_head *ptr;
+  struct ring_element *entry;
+
+
+  for(ptr = ring_table.next; ptr != &ring_table; ptr = ptr->next) {
+    entry = list_entry(ptr, struct ring_element, list);
+
+    if(entry->sk == sk) {
+      write_lock_irq(&ring_mgmt_lock);
+      list_del(ptr);
+      kfree(ptr);
+      write_unlock_irq(&ring_mgmt_lock);
+      break;
+    }
+  }
+
+}
+
+/* ********************************** */
+
+static u_int32_t num_queued_pkts(struct ring_opt *pfr) {
+
+  if(pfr->ring_slots != NULL) {
+
+    u_int32_t tot_insert = pfr->slots_info->insert_idx,
+#if defined(RING_DEBUG)
+      tot_read = pfr->slots_info->tot_read, tot_pkts;
+#else
+    tot_read = pfr->slots_info->tot_read;
+#endif
+
+    if(tot_insert >= tot_read) {
+#if defined(RING_DEBUG)
+      tot_pkts = tot_insert-tot_read;
+#endif
+      return(tot_insert-tot_read);
+    } else {
+#if defined(RING_DEBUG)
+      tot_pkts = ((u_int32_t)-1)+tot_insert-tot_read;
+#endif
+      return(((u_int32_t)-1)+tot_insert-tot_read);
+    }
+
+#if defined(RING_DEBUG)
+    printk("-> num_queued_pkts=%d [tot_insert=%d][tot_read=%d]\n",
+	   tot_pkts, tot_insert, tot_read);
+#endif
+
+  } else
+    return(0);
+}
+
+/* ********************************** */
+
+static inline FlowSlot* get_insert_slot(struct ring_opt *pfr) {
+#if defined(RING_DEBUG)
+  printk("get_insert_slot(%d)\n", pfr->slots_info->insert_idx);
+#endif
+
+  if(pfr->ring_slots != NULL) {
+    FlowSlot *slot = (FlowSlot*)&(pfr->ring_slots[pfr->slots_info->insert_idx
+						  *pfr->slots_info->slot_len]);
+    return(slot);
+  } else
+    return(NULL);
+}
+
+/* ********************************** */
+
+static inline FlowSlot* get_remove_slot(struct ring_opt *pfr) {
+#if defined(RING_DEBUG)
+  printk("get_remove_slot(%d)\n", pfr->slots_info->remove_idx);
+#endif
+
+  if(pfr->ring_slots != NULL)
+    return((FlowSlot*)&(pfr->ring_slots[pfr->slots_info->remove_idx*
+					pfr->slots_info->slot_len]));
+  else
+    return(NULL);
+}
+
+/* ********************************** */
+
+static void add_skb_to_ring(struct sk_buff *skb,
+			    struct ring_opt *pfr,
+			    u_char recv_packet,
+			    u_char real_skb /* 1=skb 0=faked skb */) {
+  FlowSlot *theSlot;
+  int idx, displ;
+
+  if(recv_packet) {
+    /* Hack for identifying a packet received by the e1000 */
+    if(real_skb) {
+      displ = SKB_DISPLACEMENT;
+    } else
+      displ = 0; /* Received by the e1000 wrapper */
+  } else
+    displ = 0;
+
+  write_lock(&pfr->ring_index_lock);
+  pfr->slots_info->tot_pkts++;
+  write_unlock(&pfr->ring_index_lock);
+
+  /* BPF Filtering (from af_packet.c) */
+  if(pfr->bpfFilter != NULL) {
+    unsigned res = 1, len;
+
+    len = skb->len-skb->data_len;
+
+    write_lock(&pfr->ring_index_lock);
+    skb->data -= displ;
+    res = sk_run_filter(skb, pfr->bpfFilter->insns, pfr->bpfFilter->len);
+    skb->data += displ;
+    write_unlock(&pfr->ring_index_lock);
+
+    if(res == 0) {
+      /* Filter failed */
+
+#if defined(RING_DEBUG)
+      printk("add_skb_to_ring(skb): Filter failed [len=%d][tot=%llu]"
+	     "[insertIdx=%d][pkt_type=%d][cloned=%d]\n",
+	     (int)skb->len, pfr->slots_info->tot_pkts,
+	     pfr->slots_info->insert_idx,
+	     skb->pkt_type, skb->cloned);
+#endif
+
+      return;
+    }
+  }
+
+  /* ************************** */
+
+  if(pfr->sample_rate > 1) {
+    if(pfr->pktToSample == 0) {
+      write_lock(&pfr->ring_index_lock);
+      pfr->pktToSample = pfr->sample_rate;
+      write_unlock(&pfr->ring_index_lock);
+    } else {
+      write_lock(&pfr->ring_index_lock);
+      pfr->pktToSample--;
+      write_unlock(&pfr->ring_index_lock);
+
+#if defined(RING_DEBUG)
+      printk("add_skb_to_ring(skb): sampled packet [len=%d]"
+	     "[tot=%llu][insertIdx=%d][pkt_type=%d][cloned=%d]\n",
+	     (int)skb->len, pfr->slots_info->tot_pkts,
+	     pfr->slots_info->insert_idx,
+	     skb->pkt_type, skb->cloned);
+#endif
+      return;
+    }
+  }
+
+  /* ************************************* */
+
+  if((pfr->reflector_dev != NULL)
+     && (!netif_queue_stopped(pfr->reflector_dev))) {
+    int cpu = smp_processor_id();
+
+    /* increase reference counter so that this skb is not freed */
+    atomic_inc(&skb->users);
+
+    skb->data -= displ;
+
+    /* send it */
+    if (pfr->reflector_dev->xmit_lock_owner != cpu) {
+      spin_lock_bh(&pfr->reflector_dev->xmit_lock);
+      pfr->reflector_dev->xmit_lock_owner = cpu;
+      spin_unlock_bh(&pfr->reflector_dev->xmit_lock);
+
+      if (pfr->reflector_dev->hard_start_xmit(skb,
+					      pfr->reflector_dev) == 0) {
+        spin_lock_bh(&pfr->reflector_dev->xmit_lock);
+	pfr->reflector_dev->xmit_lock_owner = -1;
+	skb->data += displ;
+	spin_unlock_bh(&pfr->reflector_dev->xmit_lock);
+#if defined(RING_DEBUG)
+	printk("++ hard_start_xmit succeeded\n");
+#endif
+	return; /* OK */
+      }
+
+      spin_lock_bh(&pfr->reflector_dev->xmit_lock);
+      pfr->reflector_dev->xmit_lock_owner = -1;
+      spin_unlock_bh(&pfr->reflector_dev->xmit_lock);
+    }
+
+#if defined(RING_DEBUG)
+    printk("++ hard_start_xmit failed\n");
+#endif
+    skb->data += displ;
+    return; /* -ENETDOWN */
+  }
+
+  /* ************************************* */
+
+#if defined(RING_DEBUG)
+  printk("add_skb_to_ring(skb) [len=%d][tot=%llu][insertIdx=%d]"
+	 "[pkt_type=%d][cloned=%d]\n",
+	 (int)skb->len, pfr->slots_info->tot_pkts,
+	 pfr->slots_info->insert_idx,
+	 skb->pkt_type, skb->cloned);
+#endif
+
+  idx = pfr->slots_info->insert_idx;
+  theSlot = get_insert_slot(pfr);
+
+  if((theSlot != NULL) && (theSlot->slot_state == 0)) {
+    struct pcap_pkthdr *hdr;
+    unsigned int bucketSpace;
+    char *bucket;
+
+    /* Update Index */
+    idx++;
+
+    if(idx == pfr->slots_info->tot_slots) {
+      write_lock(&pfr->ring_index_lock);
+      pfr->slots_info->insert_idx = 0;
+      write_unlock(&pfr->ring_index_lock);
+    } else {
+      write_lock(&pfr->ring_index_lock);
+      pfr->slots_info->insert_idx = idx;
+      write_unlock(&pfr->ring_index_lock);
+    }
+
+    bucketSpace = pfr->slots_info->slot_len
+#ifdef RING_MAGIC
+      - sizeof(u_char)
+#endif
+      - sizeof(u_char)  /* flowSlot.slot_state */
+      - sizeof(struct pcap_pkthdr)
+      - 1 /* 10 */ /* safe boundary */;
+
+    bucket = &theSlot->bucket;
+    hdr = (struct pcap_pkthdr*)bucket;
+
+    if(skb->stamp.tv_sec == 0) do_gettimeofday(&skb->stamp);
+
+    hdr->ts.tv_sec = skb->stamp.tv_sec, hdr->ts.tv_usec = skb->stamp.tv_usec;
+    hdr->caplen    = skb->len+displ;
+
+    if(hdr->caplen > bucketSpace)
+      hdr->caplen = bucketSpace;
+
+    hdr->len = skb->len+displ;
+    memcpy(&bucket[sizeof(struct pcap_pkthdr)],
+	   skb->data-displ, hdr->caplen);
+
+#if defined(RING_DEBUG)
+    {
+      static unsigned int lastLoss = 0;
+
+      if(pfr->slots_info->tot_lost
+	 && (lastLoss != pfr->slots_info->tot_lost)) {
+	printk("add_skb_to_ring(%d): [bucketSpace=%d]"
+	       "[hdr.caplen=%d][skb->len=%d]"
+	       "[pcap_pkthdr=%d][removeIdx=%d]"
+	       "[loss=%lu][page=%u][slot=%u]\n",
+	       idx-1, bucketSpace, hdr->caplen, skb->len,
+	       sizeof(struct pcap_pkthdr),
+	       pfr->slots_info->remove_idx,
+	       (long unsigned int)pfr->slots_info->tot_lost,
+	       pfr->insert_page_id, pfr->insert_slot_id);
+
+	lastLoss = pfr->slots_info->tot_lost;
+      }
+    }
+#endif
+
+    write_lock(&pfr->ring_index_lock);
+    pfr->slots_info->tot_insert++;
+    theSlot->slot_state = 1;
+    write_unlock(&pfr->ring_index_lock);
+  } else {
+    write_lock(&pfr->ring_index_lock);
+    pfr->slots_info->tot_lost++;
+    write_unlock(&pfr->ring_index_lock);
+
+#if defined(RING_DEBUG)
+    printk("add_skb_to_ring(skb): packet lost [loss=%lu]"
+	   "[removeIdx=%u][insertIdx=%u]\n",
+	   (long unsigned int)pfr->slots_info->tot_lost,
+	   pfr->slots_info->remove_idx, pfr->slots_info->insert_idx);
+#endif
+  }
+
+  /* wakeup in case of poll() */
+  if(waitqueue_active(&pfr->ring_slots_waitqueue))
+    wake_up_interruptible(&pfr->ring_slots_waitqueue);
+}
+
+/* ********************************** */
+
+static u_int hash_skb(struct ring_cluster *cluster_ptr,
+		      struct sk_buff *skb, u_char recv_packet) {
+  u_int idx;
+  int displ;
+  struct iphdr *ip;
+
+  if(cluster_ptr->hashing_mode == cluster_round_robin) {
+    idx = cluster_ptr->hashing_id++;
+  } else {
+    /* Per-flow clustering */
+    if(skb->len > sizeof(struct iphdr)+sizeof(struct tcphdr)) {
+      if(recv_packet)
+	displ = 0;
+      else
+	displ = SKB_DISPLACEMENT;
+
+      /*
+	skb->data+displ
+
+	Always points to to the IP part of the packet
+      */
+
+      ip = (struct iphdr*)(skb->data+displ);
+
+      idx = ip->saddr+ip->daddr+ip->protocol;
+
+      if(ip->protocol == IPPROTO_TCP) {
+	struct tcphdr *tcp = (struct tcphdr*)(skb->data+displ
+					      +sizeof(struct iphdr));
+	idx += tcp->source+tcp->dest;
+      } else if(ip->protocol == IPPROTO_UDP) {
+	struct udphdr *udp = (struct udphdr*)(skb->data+displ
+					      +sizeof(struct iphdr));
+	idx += udp->source+udp->dest;
+      }
+    } else
+      idx = skb->len;
+  }
+
+  return(idx % cluster_ptr->num_cluster_elements);
+}
+
+/* ********************************** */
+
+static int skb_ring_handler(struct sk_buff *skb,
+			    u_char recv_packet,
+			    u_char real_skb /* 1=skb 0=faked skb */) {
+  struct sock *skElement;
+  int rc = 0;
+  struct list_head *ptr;
+  struct ring_cluster *cluster_ptr;
+
+  if((!skb) /* Invalid skb */
+     || ((!enable_tx_capture) && (!recv_packet))) {
+    /*
+      An outgoing packet is about to be sent out
+      but we decided not to handle transmitted
+      packets.
+    */
+    return(0);
+  }
+
+#if defined(RING_DEBUG)
+  if(0) {
+    printk("skb_ring_handler() [len=%d][dev=%s]\n", skb->len,
+	   skb->dev->name == NULL ? "<NULL>" : skb->dev->name);
+  }
+#endif
+
+  /* [1] Check unclustered sockets */
+  for (ptr = ring_table.next; ptr != &ring_table; ptr = ptr->next) {
+    struct ring_opt *pfr;
+    struct ring_element *entry;
+
+    entry = list_entry(ptr, struct ring_element, list);
+
+    read_lock(&ring_mgmt_lock);
+    skElement = entry->sk;
+    pfr = ring_sk(skElement);
+    read_unlock(&ring_mgmt_lock);
+
+    if((pfr != NULL)
+       && (pfr->cluster_id == 0 /* No cluster */)
+       && (pfr->ring_slots != NULL)
+       && (pfr->ring_netdev == skb->dev)) {
+      /* We've found the ring where the packet can be stored */
+      read_lock(&ring_mgmt_lock);
+      add_skb_to_ring(skb, pfr, recv_packet, real_skb);
+      read_unlock(&ring_mgmt_lock);
+
+      rc = 1; /* Ring found: we've done our job */
+    }
+  }
+
+  /* [2] Check socket clusters */
+  cluster_ptr = ring_cluster_list;
+
+  while(cluster_ptr != NULL) {
+    struct ring_opt *pfr;
+
+    if(cluster_ptr->num_cluster_elements > 0) {
+      u_int skb_hash = hash_skb(cluster_ptr, skb, recv_packet);
+
+      read_lock(&ring_mgmt_lock);
+      skElement = cluster_ptr->sk[skb_hash];
+      read_unlock(&ring_mgmt_lock);
+
+      if(skElement != NULL) {
+	pfr = ring_sk(skElement);
+
+	if((pfr != NULL)
+	   && (pfr->ring_slots != NULL)
+	   && (pfr->ring_netdev == skb->dev)) {
+	  /* We've found the ring where the packet can be stored */
+          read_lock(&ring_mgmt_lock);
+	  add_skb_to_ring(skb, pfr, recv_packet, real_skb);
+          read_unlock(&ring_mgmt_lock);
+
+	  rc = 1; /* Ring found: we've done our job */
+	}
+      }
+    }
+
+    cluster_ptr = cluster_ptr->next;
+  }
+
+  if(transparent_mode) rc = 0;
+
+  if((rc != 0) && real_skb)
+    dev_kfree_skb(skb); /* Free the skb */
+
+  return(rc); /*  0 = packet not handled */
+}
+
+/* ********************************** */
+
+struct sk_buff skb;
+
+static int buffer_ring_handler(struct net_device *dev,
+			       char *data, int len) {
+
+#if defined(RING_DEBUG)
+  printk("buffer_ring_handler: [dev=%s][len=%d]\n",
+	 dev->name == NULL ? "<NULL>" : dev->name, len);
+#endif
+
+  skb.dev = dev, skb.len = len, skb.data = data,
+    skb.data_len = len, skb.stamp.tv_sec = 0; /* Calculate the time */
+
+  skb_ring_handler(&skb, 1, 0 /* fake skb */);
+
+  return(0);
+}
+
+/* ********************************** */
+
+static int ring_create(struct socket *sock, int protocol) {
+  struct sock *sk;
+  struct ring_opt *pfr;
+  int err;
+
+#if defined(RING_DEBUG)
+  printk("RING: ring_create()\n");
+#endif
+
+  /* Are you root, superuser or so ? */
+  if(!capable(CAP_NET_ADMIN))
+    return -EPERM;
+
+  if(sock->type != SOCK_RAW)
+    return -ESOCKTNOSUPPORT;
+
+  if(protocol != htons(ETH_P_ALL))
+    return -EPROTONOSUPPORT;
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0))
+  MOD_INC_USE_COUNT;
+#endif
+
+  err = -ENOMEM;
+
+  // BD: -- broke this out to keep it more simple and clear as to what the
+  // options are.
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11))
+  sk = sk_alloc(PF_RING, GFP_KERNEL, 1, NULL);
+#endif
+#endif
+
+  // BD: API changed in 2.6.12, ref:
+  // http://svn.clkao.org/svnweb/linux/revision/?rev=28201
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,11))
+  sk = sk_alloc(PF_RING, GFP_ATOMIC, &ring_proto, 1);
+#endif
+
+  if (sk == NULL)
+    goto out;
+
+  sock->ops = &ring_ops;
+  sock_init_data(sock, sk);
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11))
+  sk_set_owner(sk, THIS_MODULE);
+#endif
+#endif
+
+  err = -ENOMEM;
+  ring_sk(sk) = ring_sk_datatype(kmalloc(sizeof(*pfr), GFP_KERNEL));
+
+  if (!(pfr = ring_sk(sk))) {
+    sk_free(sk);
+    goto out;
+  }
+  memset(pfr, 0, sizeof(*pfr));
+  init_waitqueue_head(&pfr->ring_slots_waitqueue);
+  pfr->ring_index_lock = RW_LOCK_UNLOCKED;
+  atomic_set(&pfr->num_ring_slots_waiters, 0);
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+  sk->sk_family       = PF_RING;
+  sk->sk_destruct     = ring_sock_destruct;
+#else
+  sk->family          = PF_RING;
+  sk->destruct        = ring_sock_destruct;
+  sk->num             = protocol;
+#endif
+
+  ring_insert(sk);
+
+#if defined(RING_DEBUG)
+  printk("RING: ring_create() - created\n");
+#endif
+
+  return(0);
+ out:
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0))
+  MOD_DEC_USE_COUNT;
+#endif
+  return err;
+}
+
+/* *********************************************** */
+
+static int ring_release(struct socket *sock)
+{
+  struct sock *sk = sock->sk;
+  struct ring_opt *pfr = ring_sk(sk);
+
+  if(!sk)
+    return 0;
+
+#if defined(RING_DEBUG)
+  printk("RING: called ring_release\n");
+#endif
+
+#if defined(RING_DEBUG)
+  printk("RING: ring_release entered\n");
+#endif
+
+  ring_remove(sk);
+
+  sock_orphan(sk);
+  sock->sk = NULL;
+
+  /* Free the ring buffer */
+  if(pfr->ring_memory) {
+    struct page *page, *page_end;
+
+    page_end = virt_to_page(pfr->ring_memory + (PAGE_SIZE << pfr->order) - 1);
+    for(page = virt_to_page(pfr->ring_memory); page <= page_end; page++)
+      ClearPageReserved(page);
+
+    free_pages(pfr->ring_memory, pfr->order);
+  }
+
+  kfree(pfr);
+  ring_sk(sk) = NULL;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+  skb_queue_purge(&sk->sk_write_queue);
+#endif
+  sock_put(sk);
+
+#if defined(RING_DEBUG)
+  printk("RING: ring_release leaving\n");
+#endif
+
+  return 0;
+}
+
+/* ********************************** */
+/*
+ * We create a ring for this socket and bind it to the specified device
+ */
+static int packet_ring_bind(struct sock *sk, struct net_device *dev)
+{
+  u_int the_slot_len;
+  u_int32_t tot_mem;
+  struct ring_opt *pfr = ring_sk(sk);
+  struct page *page, *page_end;
+
+  if(!dev) return(-1);
+
+#if defined(RING_DEBUG)
+  printk("RING: packet_ring_bind(%s) called\n", dev->name);
+#endif
+
+  /* **********************************************
+
+  *************************************
+  *                                   *
+  *        FlowSlotInfo               *
+  *                                   *
+  ************************************* <-+
+  *        FlowSlot                   *   |
+  *************************************   |
+  *        FlowSlot                   *   |
+  *************************************   +- num_slots
+  *        FlowSlot                   *   |
+  *************************************   |
+  *        FlowSlot                   *   |
+  ************************************* <-+
+
+  ********************************************** */
+
+  the_slot_len = sizeof(u_char)    /* flowSlot.slot_state */
+    + sizeof(u_short) /* flowSlot.slot_len   */
+    + bucket_len      /* flowSlot.bucket     */;
+
+  tot_mem = sizeof(FlowSlotInfo) + num_slots*the_slot_len;
+
+  /*
+    Calculate the value of the order parameter used later.
+    See http://www.linuxjournal.com/article.php?sid=1133
+  */
+  for(pfr->order = 0;(PAGE_SIZE << pfr->order) < tot_mem; pfr->order++)  ;
+
+  /*
+    We now try to allocate the memory as required. If we fail
+    we try to allocate a smaller amount or memory (hence a
+    smaller ring).
+  */
+  while((pfr->ring_memory = __get_free_pages(GFP_ATOMIC, pfr->order)) == 0)
+    if(pfr->order-- == 0)
+      break;
+
+  if(pfr->order == 0) {
+#if defined(RING_DEBUG)
+    printk("ERROR: not enough memory\n");
+#endif
+    return(-1);
+  } else {
+#if defined(RING_DEBUG)
+    printk("RING: succesfully allocated %lu KB [tot_mem=%d][order=%ld]\n",
+	   PAGE_SIZE >> (10 - pfr->order), tot_mem, pfr->order);
+#endif
+  }
+
+  tot_mem = PAGE_SIZE << pfr->order;
+  memset((char*)pfr->ring_memory, 0, tot_mem);
+
+  /* Now we need to reserve the pages */
+  page_end = virt_to_page(pfr->ring_memory + (PAGE_SIZE << pfr->order) - 1);
+  for(page = virt_to_page(pfr->ring_memory); page <= page_end; page++)
+    SetPageReserved(page);
+
+  pfr->slots_info = (FlowSlotInfo*)pfr->ring_memory;
+  pfr->ring_slots = (char*)(pfr->ring_memory+sizeof(FlowSlotInfo));
+
+  pfr->slots_info->version     = RING_FLOWSLOT_VERSION;
+  pfr->slots_info->slot_len    = the_slot_len;
+  pfr->slots_info->tot_slots   = (tot_mem-sizeof(FlowSlotInfo))/the_slot_len;
+  pfr->slots_info->tot_mem     = tot_mem;
+  pfr->slots_info->sample_rate = sample_rate;
+
+#if defined(RING_DEBUG)
+  printk("RING: allocated %d slots [slot_len=%d][tot_mem=%u]\n",
+	 pfr->slots_info->tot_slots, pfr->slots_info->slot_len,
+	 pfr->slots_info->tot_mem);
+#endif
+
+#ifdef RING_MAGIC
+  {
+    int i;
+
+    for(i=0; i<pfr->slots_info->tot_slots; i++) {
+      unsigned long idx = i*pfr->slots_info->slot_len;
+      FlowSlot *slot = (FlowSlot*)&pfr->ring_slots[idx];
+      slot->magic = RING_MAGIC_VALUE; slot->slot_state = 0;
+    }
+  }
+#endif
+
+  pfr->insert_page_id = 1, pfr->insert_slot_id = 0;
+
+  /*
+    IMPORTANT
+    Leave this statement here as last one. In fact when
+    the ring_netdev != NULL the socket is ready to be used.
+  */
+  pfr->ring_netdev = dev;
+
+  return(0);
+}
+
+/* ************************************* */
+
+/* Bind to a device */
+static int ring_bind(struct socket *sock,
+		     struct sockaddr *sa, int addr_len)
+{
+  struct sock *sk=sock->sk;
+  struct net_device *dev = NULL;
+
+#if defined(RING_DEBUG)
+  printk("RING: ring_bind() called\n");
+#endif
+
+  /*
+   *	Check legality
+   */
+  if (addr_len != sizeof(struct sockaddr))
+    return -EINVAL;
+  if (sa->sa_family != PF_RING)
+    return -EINVAL;
+
+  /* Safety check: add trailing zero if missing */
+  sa->sa_data[sizeof(sa->sa_data)-1] = '\0';
+
+#if defined(RING_DEBUG)
+  printk("RING: searching device %s\n", sa->sa_data);
+#endif
+
+  if((dev = __dev_get_by_name(sa->sa_data)) == NULL) {
+#if defined(RING_DEBUG)
+    printk("RING: search failed\n");
+#endif
+    return(-EINVAL);
+  } else
+    return(packet_ring_bind(sk, dev));
+}
+
+/* ************************************* */
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+
+volatile void* virt_to_kseg(volatile void* address) {
+  pte_t *pte;
+  pud_t *pud;
+  unsigned long addr = (unsigned long)address;
+		       
+  pud = pud_offset(pgd_offset_k((unsigned long) address),
+		   (unsigned long) address);
+
+  /*
+     High-memory support courtesy of
+     Brad Doctor <bdoctor@ps-ax.com>
+  */
+#if defined(CONFIG_X86_PAE) && (!defined(CONFIG_NOHIGHMEM))
+  pte = pte_offset_map(pmd_offset(pud, addr), addr);
+#else
+  pte = pmd_offset_map(pud, addr);
+#endif
+
+  return((volatile void*)pte_page(*pte));
+}
+
+#else /* 2.4 */
+
+/* http://www.scs.ch/~frey/linux/memorymap.html */
+volatile void *virt_to_kseg(volatile void *address)
+{
+  pgd_t *pgd; pmd_t *pmd; pte_t *ptep, pte;
+  unsigned long va, ret = 0UL;
+
+  va=VMALLOC_VMADDR((unsigned long)address);
+
+  /* get the page directory. Use the kernel memory map. */
+  pgd = pgd_offset_k(va);
+
+  /* check whether we found an entry */
+  if (!pgd_none(*pgd))
+    {
+      /* get the page middle directory */
+      pmd = pmd_offset(pgd, va);
+      /* check whether we found an entry */
+      if (!pmd_none(*pmd))
+	{
+	  /* get a pointer to the page table entry */
+	  ptep = pte_offset(pmd, va);
+	  pte = *ptep;
+	  /* check for a valid page */
+	  if (pte_present(pte))
+	    {
+	      /* get the address the page is refering to */
+	      ret = (unsigned long)page_address(pte_page(pte));
+	      /* add the offset within the page to the page address */
+	      ret |= (va & (PAGE_SIZE -1));
+	    }
+	}
+    }
+  return((volatile void *)ret);
+}
+#endif
+
+/* ************************************* */
+
+static int ring_mmap(struct file *file,
+		     struct socket *sock,
+		     struct vm_area_struct *vma)
+{
+  struct sock *sk = sock->sk;
+  struct ring_opt *pfr = ring_sk(sk);
+  unsigned long size, start;
+  u_int pagesToMap;
+  char *ptr;
+
+#if defined(RING_DEBUG)
+  printk("RING: ring_mmap() called\n");
+#endif
+
+  if(pfr->ring_memory == 0) {
+#if defined(RING_DEBUG)
+    printk("RING: ring_mmap() failed: mapping area to an unbound socket\n");
+#endif
+    return -EINVAL;
+  }
+
+  size = (unsigned long)(vma->vm_end-vma->vm_start);
+
+  if(size % PAGE_SIZE) {
+#if defined(RING_DEBUG)
+    printk("RING: ring_mmap() failed: len is not multiple of PAGE_SIZE\n");
+#endif
+    return(-EINVAL);
+  }
+
+  /* if userspace tries to mmap beyond end of our buffer, fail */
+  if(size > pfr->slots_info->tot_mem) {
+#if defined(RING_DEBUG)
+    printk("proc_mmap() failed: area too large [%ld > %d]\n", size, pfr->slots_info->tot_mem);
+#endif
+    return(-EINVAL);
+  }
+
+  pagesToMap = size/PAGE_SIZE;
+
+#if defined(RING_DEBUG)
+  printk("RING: ring_mmap() called. %d pages to map\n", pagesToMap);
+#endif
+
+#if defined(RING_DEBUG)
+  printk("RING: mmap [slot_len=%d][tot_slots=%d] for ring on device %s\n",
+	 pfr->slots_info->slot_len, pfr->slots_info->tot_slots,
+	 pfr->ring_netdev->name);
+#endif
+
+  /* we do not want to have this area swapped out, lock it */
+  vma->vm_flags |= VM_LOCKED;
+  start = vma->vm_start;
+
+  /* Ring slots start from page 1 (page 0 is reserved for FlowSlotInfo) */
+  ptr = (char*)(start+PAGE_SIZE);
+
+  if(remap_page_range(
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+		      vma,
+#endif
+		      start,
+		      __pa(pfr->ring_memory),
+		      PAGE_SIZE*pagesToMap, vma->vm_page_prot)) {
+#if defined(RING_DEBUG)
+    printk("remap_page_range() failed\n");
+#endif
+    return(-EAGAIN);
+  }
+
+#if defined(RING_DEBUG)
+  printk("proc_mmap(pagesToMap=%d): success.\n", pagesToMap);
+#endif
+
+  return 0;
+}
+
+/* ************************************* */
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+static int ring_recvmsg(struct kiocb *iocb, struct socket *sock,
+			struct msghdr *msg, size_t len, int flags)
+#else
+  static int ring_recvmsg(struct socket *sock, struct msghdr *msg, int len,
+			  int flags, struct scm_cookie *scm)
+#endif
+{
+  FlowSlot* slot;
+  struct ring_opt *pfr = ring_sk(sock->sk);
+  u_int32_t queued_pkts, num_loops = 0;
+
+#if defined(RING_DEBUG)
+  printk("ring_recvmsg called\n");
+#endif
+
+  slot = get_remove_slot(pfr);
+
+  while((queued_pkts = num_queued_pkts(pfr)) < MIN_QUEUED_PKTS) {
+    wait_event_interruptible(pfr->ring_slots_waitqueue, 1);
+
+#if defined(RING_DEBUG)
+    printk("-> ring_recvmsg returning %d [queued_pkts=%d][num_loops=%d]\n",
+	   slot->slot_state, queued_pkts, num_loops);
+#endif
+
+    if(queued_pkts > 0) {
+      if(num_loops++ > MAX_QUEUE_LOOPS)
+	break;
+    }
+  }
+
+#if defined(RING_DEBUG)
+  if(slot != NULL)
+    printk("ring_recvmsg is returning [queued_pkts=%d][num_loops=%d]\n",
+	   queued_pkts, num_loops);
+#endif
+
+  return(queued_pkts);
+}
+
+/* ************************************* */
+
+unsigned int ring_poll(struct file * file,
+		       struct socket *sock, poll_table *wait)
+{
+  FlowSlot* slot;
+  struct ring_opt *pfr = ring_sk(sock->sk);
+
+#if defined(RING_DEBUG)
+  printk("poll called\n");
+#endif
+
+  slot = get_remove_slot(pfr);
+
+  if((slot != NULL) && (slot->slot_state == 0))
+    poll_wait(file, &pfr->ring_slots_waitqueue, wait);
+
+#if defined(RING_DEBUG)
+  printk("poll returning %d\n", slot->slot_state);
+#endif
+
+  if((slot != NULL) && (slot->slot_state == 1))
+    return(POLLIN | POLLRDNORM);
+  else
+    return(0);
+}
+
+/* ************************************* */
+
+int add_to_cluster_list(struct ring_cluster *el,
+			struct sock *sock) {
+
+  if(el->num_cluster_elements == CLUSTER_LEN)
+    return(-1); /* Cluster full */
+
+  ring_sk_datatype(ring_sk(sock))->cluster_id = el->cluster_id;
+  el->sk[el->num_cluster_elements] = sock;
+  el->num_cluster_elements++;
+  return(0);
+}
+
+/* ************************************* */
+
+int remove_from_cluster_list(struct ring_cluster *el,
+			     struct sock *sock) {
+  int i, j;
+
+  for(i=0; i<CLUSTER_LEN; i++)
+    if(el->sk[i] == sock) {
+      el->num_cluster_elements--;
+
+      if(el->num_cluster_elements > 0) {
+	/* The cluster contains other elements */
+	for(j=i; j<CLUSTER_LEN-1; j++)
+	  el->sk[j] = el->sk[j+1];
+
+	el->sk[CLUSTER_LEN-1] = NULL;
+      } else {
+	/* Empty cluster */
+	memset(el->sk, 0, sizeof(el->sk));
+      }
+
+      return(0);
+    }
+
+  return(-1); /* Not found */
+}
+
+/* ************************************* */
+
+static int remove_from_cluster(struct sock *sock,
+			       struct ring_opt *pfr)
+{
+  struct ring_cluster *el;
+
+#if defined(RING_DEBUG)
+  printk("--> remove_from_cluster(%d)\n", pfr->cluster_id);
+#endif
+
+  if(pfr->cluster_id == 0 /* 0 = No Cluster */)
+    return(0); /* Noting to do */
+
+  el = ring_cluster_list;
+
+  while(el != NULL) {
+    if(el->cluster_id == pfr->cluster_id) {
+      return(remove_from_cluster_list(el, sock));
+    } else
+      el = el->next;
+  }
+
+  return(-EINVAL); /* Not found */
+}
+
+/* ************************************* */
+
+static int add_to_cluster(struct sock *sock,
+			  struct ring_opt *pfr,
+			  u_short cluster_id)
+{
+  struct ring_cluster *el;
+
+#ifndef RING_DEBUG
+  printk("--> add_to_cluster(%d)\n", cluster_id);
+#endif
+
+  if(cluster_id == 0 /* 0 = No Cluster */) return(-EINVAL);
+
+  if(pfr->cluster_id != 0)
+    remove_from_cluster(sock, pfr);
+
+  el = ring_cluster_list;
+
+  while(el != NULL) {
+    if(el->cluster_id == cluster_id) {
+      return(add_to_cluster_list(el, sock));
+    } else
+      el = el->next;
+  }
+
+  /* There's no existing cluster. We need to create one */
+  if((el = kmalloc(sizeof(struct ring_cluster), GFP_KERNEL)) == NULL)
+    return(-ENOMEM);
+
+  el->cluster_id = cluster_id;
+  el->num_cluster_elements = 1;
+  el->hashing_mode = cluster_per_flow; /* Default */
+  el->hashing_id   = 0;
+
+  memset(el->sk, 0, sizeof(el->sk));
+  el->sk[0] = sock;
+  el->next = ring_cluster_list;
+  ring_cluster_list = el;
+  pfr->cluster_id = cluster_id;
+
+  return(0); /* 0 = OK */
+}
+
+/* ************************************* */
+
+/* Code taken/inspired from core/sock.c */
+static int ring_setsockopt(struct socket *sock,
+			   int level, int optname,
+			   char *optval, int optlen)
+{
+  struct ring_opt *pfr = ring_sk(sock->sk);
+  int val, found, ret = 0;
+  u_int cluster_id;
+  char devName[8];
+
+  if((optlen<sizeof(int)) || (pfr == NULL))
+    return(-EINVAL);
+
+  if (get_user(val, (int *)optval))
+    return -EFAULT;
+
+  found = 1;
+
+  switch(optname)
+    {
+    case SO_ATTACH_FILTER:
+      ret = -EINVAL;
+      if (optlen == sizeof(struct sock_fprog)) {
+	unsigned int fsize;
+	struct sock_fprog fprog;
+	struct sk_filter *filter;
+
+	ret = -EFAULT;
+
+	/*
+	  NOTE
+
+	  Do not call copy_from_user within a held
+	  splinlock (e.g. ring_mgmt_lock) as this caused
+	  problems when certain debugging was enabled under
+	  2.6.5 -- including hard lockups of the machine.
+	*/
+	if(copy_from_user(&fprog, optval, sizeof(fprog)))
+	  break;
+
+	fsize = sizeof(struct sock_filter) * fprog.len;
+	filter = kmalloc(fsize, GFP_KERNEL);
+
+	if(filter == NULL) {
+	  ret = -ENOMEM;
+	  break;
+	}
+
+	if(copy_from_user(filter->insns, fprog.filter, fsize))
+	  break;
+
+	filter->len = fprog.len;
+
+	if(sk_chk_filter(filter->insns, filter->len) != 0) {
+	  /* Bad filter specified */
+	  kfree(filter);
+	  pfr->bpfFilter = NULL;
+	  break;
+	}
+
+	/* get the lock, set the filter, release the lock */
+	write_lock(&ring_mgmt_lock);
+	pfr->bpfFilter = filter;
+	write_unlock(&ring_mgmt_lock);
+      }
+      ret = 0;
+      break;
+
+    case SO_DETACH_FILTER:
+      write_lock(&ring_mgmt_lock);
+      found = 1;
+      if(pfr->bpfFilter != NULL) {
+	kfree(pfr->bpfFilter);
+	pfr->bpfFilter = NULL;
+	write_unlock(&ring_mgmt_lock);
+	break;
+      }
+      ret = -ENONET;
+      break;
+
+    case SO_ADD_TO_CLUSTER:
+      if (optlen!=sizeof(val))
+	return -EINVAL;
+
+      if (copy_from_user(&cluster_id, optval, sizeof(cluster_id)))
+	return -EFAULT;
+
+      write_lock(&ring_mgmt_lock);
+      ret = add_to_cluster(sock->sk, pfr, cluster_id);
+      write_unlock(&ring_mgmt_lock);
+      break;
+
+    case SO_REMOVE_FROM_CLUSTER:
+      write_lock(&ring_mgmt_lock);
+      ret = remove_from_cluster(sock->sk, pfr);
+      write_unlock(&ring_mgmt_lock);
+      break;
+
+    case SO_SET_REFLECTOR:
+      if(optlen >= (sizeof(devName)-1))
+	return -EINVAL;
+
+      if(optlen > 0) {
+	if(copy_from_user(devName, optval, optlen))
+	  return -EFAULT;
+      }
+
+      devName[optlen] = '\0';
+
+#if defined(RING_DEBUG)
+      printk("+++ SO_SET_REFLECTOR(%s)\n", devName);
+#endif
+
+      write_lock(&ring_mgmt_lock);
+      pfr->reflector_dev = dev_get_by_name(devName);
+      write_unlock(&ring_mgmt_lock);
+
+#if defined(RING_DEBUG)
+      if(pfr->reflector_dev != NULL)
+	printk("SO_SET_REFLECTOR(%s): succeded\n", devName);
+      else
+	printk("SO_SET_REFLECTOR(%s): device unknown\n", devName);
+#endif
+      break;
+
+    default:
+      found = 0;
+      break;
+    }
+
+  if(found)
+    return(ret);
+  else
+    return(sock_setsockopt(sock, level, optname, optval, optlen));
+}
+
+/* ************************************* */
+
+static int ring_ioctl(struct socket *sock,
+		      unsigned int cmd, unsigned long arg)
+{
+  switch(cmd)
+    {
+    case SIOCGIFFLAGS:
+    case SIOCSIFFLAGS:
+    case SIOCGIFCONF:
+    case SIOCGIFMETRIC:
+    case SIOCSIFMETRIC:
+    case SIOCGIFMEM:
+    case SIOCSIFMEM:
+    case SIOCGIFMTU:
+    case SIOCSIFMTU:
+    case SIOCSIFLINK:
+    case SIOCGIFHWADDR:
+    case SIOCSIFHWADDR:
+    case SIOCSIFMAP:
+    case SIOCGIFMAP:
+    case SIOCSIFSLAVE:
+    case SIOCGIFSLAVE:
+    case SIOCGIFINDEX:
+    case SIOCGIFNAME:
+    case SIOCGIFCOUNT:
+    case SIOCSIFHWBROADCAST:
+      return(dev_ioctl(cmd,(void *) arg));
+
+    default:
+      return -EOPNOTSUPP;
+    }
+
+  return 0;
+}
+
+/* ************************************* */
+
+static struct proto_ops ring_ops = {
+  .family	=	PF_RING,
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+  .owner	=	THIS_MODULE,
+#endif
+
+  /* Operations that make no sense on ring sockets. */
+  .connect	=	sock_no_connect,
+  .socketpair	=	sock_no_socketpair,
+  .accept	=	sock_no_accept,
+  .getname	=	sock_no_getname,
+  .listen	=	sock_no_listen,
+  .shutdown	=	sock_no_shutdown,
+  .sendpage	=	sock_no_sendpage,
+  .sendmsg	=	sock_no_sendmsg,
+  .getsockopt	=	sock_no_getsockopt,
+
+  /* Now the operations that really occur. */
+  .release	=	ring_release,
+  .bind		=	ring_bind,
+  .mmap		=	ring_mmap,
+  .poll		=	ring_poll,
+  .setsockopt	=	ring_setsockopt,
+  .ioctl	=	ring_ioctl,
+  .recvmsg	=	ring_recvmsg,
+};
+
+/* ************************************ */
+
+static struct net_proto_family ring_family_ops = {
+  .family	=	PF_RING,
+  .create	=	ring_create,
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+  .owner	=	THIS_MODULE,
+#endif
+};
+
+// BD: API changed in 2.6.12, ref:
+// http://svn.clkao.org/svnweb/linux/revision/?rev=28201
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,11))
+static struct proto ring_proto = {
+  .name		=	"PF_RING",
+  .owner	=	THIS_MODULE,
+  .obj_size	=	sizeof(struct sock),
+};
+#endif
+
+/* ************************************ */
+
+static void __exit ring_exit(void)
+{
+  struct list_head *ptr;
+  struct ring_element *entry;
+
+  for(ptr = ring_table.next; ptr != &ring_table; ptr = ptr->next) {
+    entry = list_entry(ptr, struct ring_element, list);
+    kfree(entry);
+  }
+
+  while(ring_cluster_list != NULL) {
+    struct ring_cluster *next = ring_cluster_list->next;
+    kfree(ring_cluster_list);
+    ring_cluster_list = next;
+  }
+
+  set_skb_ring_handler(NULL);
+  set_buffer_ring_handler(NULL);
+  sock_unregister(PF_RING);
+
+  printk("PF_RING shut down.\n");
+}
+
+/* ************************************ */
+
+static int __init ring_init(void)
+{
+  printk("Welcome to PF_RING %s\n(C) 2004 L.Deri <deri@ntop.org>\n",
+	 RING_VERSION);
+
+  INIT_LIST_HEAD(&ring_table);
+  ring_cluster_list = NULL;
+
+  sock_register(&ring_family_ops);
+
+  set_skb_ring_handler(skb_ring_handler);
+  set_buffer_ring_handler(buffer_ring_handler);
+
+  if(get_buffer_ring_handler() != buffer_ring_handler) {
+    printk("PF_RING: set_buffer_ring_handler FAILED\n");
+
+    set_skb_ring_handler(NULL);
+    set_buffer_ring_handler(NULL);
+    sock_unregister(PF_RING);
+    return -1;
+  } else {
+    printk("PF_RING: bucket length    %d bytes\n", bucket_len);
+    printk("PF_RING: ring slots       %d\n", num_slots);
+    printk("PF_RING: sample rate      %d [1=no sampling]\n", sample_rate);
+    printk("PF_RING: capture TX       %s\n",
+	   enable_tx_capture ? "Yes [RX+TX]" : "No [RX only]");
+    printk("PF_RING: transparent mode %s\n",
+	   transparent_mode ? "Yes" : "No");
+
+    printk("PF_RING initialized correctly.\n");
+    return 0;
+  }
+}
+
+module_init(ring_init);
+module_exit(ring_exit);
+MODULE_LICENSE("GPL");
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
+MODULE_ALIAS_NETPROTO(PF_RING);
+#endif