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path: root/kernel/patches/base-patches/ebtables-v2.0pre9_vs_2.4.18.diff
blob: 08ef3a2a9b95121c4abe1d140dd88ce5c3b3ca3a (plain)
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ebtables-v2.0pre9 - 27 June

*** modifications for brouter support ***

--- linux/net/bridge/br_private.h	Fri Jun 28 17:52:15 2002
+++ ebt2.0pre9/net/bridge/br_private.h	Thu Jun 27 20:16:49 2002
@@ -170,7 +170,7 @@
 
 /* br_input.c */
 extern int  br_handle_frame_finish(struct sk_buff *skb);
-extern void br_handle_frame(struct sk_buff *skb);
+extern int br_handle_frame(struct sk_buff *skb);
 
 /* br_ioctl.c */
 extern void br_call_ioctl_atomic(void (*fn)(void));
--- linux/include/linux/if_bridge.h	Thu Nov 22 20:47:12 2001
+++ ebt2.0pre9/include/linux/if_bridge.h	Thu Jun 27 20:00:23 2002
@@ -102,8 +102,13 @@
 struct net_bridge_port;
 
 extern int (*br_ioctl_hook)(unsigned long arg);
-extern void (*br_handle_frame_hook)(struct sk_buff *skb);
-
+extern int (*br_handle_frame_hook)(struct sk_buff *skb);
+#if defined(CONFIG_BRIDGE_EBT_BROUTE) || \
+    defined(CONFIG_BRIDGE_EBT_BROUTE_MODULE)
+extern unsigned int (*broute_decision) (unsigned int hook, struct sk_buff **pskb,
+   const struct net_device *in, const struct net_device *out,
+   int (*okfn)(struct sk_buff *));
+#endif
 #endif
 
 #endif
--- linux/net/core/dev.c	Mon Feb 25 20:38:14 2002
+++ ebt2.0pre9/net/core/dev.c	Thu Jun 27 19:11:50 2002
@@ -1384,7 +1384,14 @@
 }
 
 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-void (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
+int (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
+#if defined(CONFIG_BRIDGE_EBT_BROUTE) || \
+    defined(CONFIG_BRIDGE_EBT_BROUTE_MODULE)
+unsigned int (*broute_decision) (unsigned int hook, struct sk_buff **pskb,
+			const struct net_device *in,
+			const struct net_device *out,
+			int (*okfn)(struct sk_buff *)) = NULL;
+#endif
 #endif
 
 static __inline__ int handle_bridge(struct sk_buff *skb,
@@ -1394,14 +1401,14 @@
 
 	if (pt_prev) {
 		if (!pt_prev->data)
-			ret = deliver_to_old_ones(pt_prev, skb, 0);
+			deliver_to_old_ones(pt_prev, skb, 0);
 		else {
 			atomic_inc(&skb->users);
-			ret = pt_prev->func(skb, skb->dev, pt_prev);
+			pt_prev->func(skb, skb->dev, pt_prev);
 		}
 	}
 
-	br_handle_frame_hook(skb);
+	ret = br_handle_frame_hook(skb);
 	return ret;
 }
 
@@ -1479,9 +1486,10 @@
 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 			if (skb->dev->br_port != NULL &&
 			    br_handle_frame_hook != NULL) {
-				handle_bridge(skb, pt_prev);
-				dev_put(rx_dev);
-				continue;
+				if (handle_bridge(skb, pt_prev) == 0) {
+					dev_put(rx_dev);
+					continue;
+				}
 			}
 #endif
 
--- linux/net/bridge/br_input.c	Fri Jun 28 17:52:15 2002
+++ ebt2.0pre9/net/bridge/br_input.c	Thu Jun 27 19:11:50 2002
@@ -19,7 +19,10 @@
 #include <linux/if_bridge.h>
 #include <linux/netfilter_bridge.h>
 #include "br_private.h"
-
+#if defined(CONFIG_BRIDGE_EBT_BROUTE) || \
+    defined(CONFIG_BRIDGE_EBT_BROUTE_MODULE)
+#include <linux/netfilter.h>
+#endif
 unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
 
 static int br_pass_frame_up_finish(struct sk_buff *skb)
@@ -112,7 +115,7 @@
 	return 0;
 }
 
-void br_handle_frame(struct sk_buff *skb)
+int br_handle_frame(struct sk_buff *skb)
 {
 	struct net_bridge *br;
 	unsigned char *dest;
@@ -146,23 +149,30 @@
 		goto handle_special_frame;
 
 	if (p->state == BR_STATE_FORWARDING) {
+#if defined(CONFIG_BRIDGE_EBT_BROUTE) || \
+    defined(CONFIG_BRIDGE_EBT_BROUTE_MODULE)
+		if (broute_decision && broute_decision(NF_BR_BROUTING, &skb,
+		   skb->dev, NULL, NULL) == NF_DROP)
+			return -1;
+#endif
 		NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
 			br_handle_frame_finish);
 		read_unlock(&br->lock);
-		return;
+		return 0;
 	}
 
 err:
 	read_unlock(&br->lock);
 err_nolock:
 	kfree_skb(skb);
-	return;
+	return 0;
 
 handle_special_frame:
 	if (!dest[5]) {
 		br_stp_handle_bpdu(skb);
-		return;
+		return 0;
 	}
 
 	kfree_skb(skb);
+	return 0;
 }
--- linux/net/netsyms.c	Mon Feb 25 20:38:14 2002
+++ ebt2.0pre9/net/netsyms.c	Thu Jun 27 19:11:50 2002
@@ -228,6 +228,10 @@
 
 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 EXPORT_SYMBOL(br_handle_frame_hook);
+#if defined(CONFIG_BRIDGE_EBT_BROUTE) || \
+    defined(CONFIG_BRIDGE_EBT_BROUTE_MODULE)
+EXPORT_SYMBOL(broute_decision);
+#endif
 #ifdef CONFIG_INET
 EXPORT_SYMBOL(br_ioctl_hook);
 #endif
--- linux/include/linux/netfilter_bridge.h	Tue Jun 12 04:15:27 2001
+++ ebt2.0pre9/include/linux/netfilter_bridge.h	Thu Jun 27 20:17:07 2002
@@ -18,7 +18,19 @@
 #define NF_BR_LOCAL_OUT		3
 /* Packets about to hit the wire. */
 #define NF_BR_POST_ROUTING	4
-#define NF_BR_NUMHOOKS		5
+/* Not really a hook, but used for the ebtables broute table */
+#define NF_BR_BROUTING		5
+#define NF_BR_NUMHOOKS		6
 
+enum nf_br_hook_priorities {
+        NF_BR_PRI_FIRST = INT_MIN,
+        NF_BR_PRI_FILTER_BRIDGED = -200,
+        NF_BR_PRI_FILTER_OTHER = 200,
+        NF_BR_PRI_NAT_DST_BRIDGED = -300,
+        NF_BR_PRI_NAT_DST_OTHER = 100,
+        NF_BR_PRI_NAT_SRC_BRIDGED = -100,
+        NF_BR_PRI_NAT_SRC_OTHER = 300,
+        NF_BR_PRI_LAST = INT_MAX,
+};
 
 #endif

*** modifications for ebtables compilation ***

--- linux/net/Makefile	Mon Feb 25 20:38:14 2002
+++ ebt2.0pre9/net/Makefile	Thu Jun 27 19:11:50 2002
@@ -7,7 +7,8 @@
 
 O_TARGET :=	network.o
 
-mod-subdirs :=	ipv4/netfilter ipv6/netfilter ipx irda bluetooth atm netlink sched
+mod-subdirs :=	bridge/netfilter ipv4/netfilter ipv6/netfilter ipx irda \
+	bluetooth atm netlink sched
 export-objs :=	netsyms.o
 
 subdir-y :=	core ethernet
@@ -23,6 +24,12 @@
 ifneq ($(CONFIG_IPV6),n)
 ifneq ($(CONFIG_IPV6),)
 subdir-$(CONFIG_NETFILTER)	+= ipv6/netfilter
+endif
+endif
+
+ifneq ($(CONFIG_BRIDGE),n)
+ifneq ($CONFIG_BRIDGE),)
+subdir-$(CONFIG_BRIDGE)		+= bridge/netfilter
 endif
 endif
 
--- linux/net/Config.in	Fri Jun 28 17:52:15 2002
+++ ebt2.0pre9/net/Config.in	Thu Jun 27 19:11:50 2002
@@ -60,6 +60,9 @@
    source net/decnet/Config.in
 fi
 dep_tristate '802.1d Ethernet Bridging' CONFIG_BRIDGE $CONFIG_INET
+if [ "$CONFIG_BRIDGE" != "n" -a "$CONFIG_NETFILTER" != "n" ]; then
+   source net/bridge/netfilter/Config.in
+fi
 if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
    if [ "$CONFIG_BRIDGE" != "n" -a "$CONFIG_NETFILTER" != "n" ]; then
       bool '  netfilter (firewalling) support' CONFIG_BRIDGE_NF

*** new ebtables files ***

--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/Makefile	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,26 @@
+#
+# Makefile for the netfilter modules on top of bridging.
+#
+# Note! Dependencies are done automagically by 'make dep', which also
+# removes any old dependencies. DON'T put your own dependencies here
+# unless it's something special (ie not a .c file).
+#
+# Note 2! The CFLAGS definition is now in the main makefile...
+
+O_TARGET	:= netfilter.o
+
+export-objs = ebtables.o
+
+obj-$(CONFIG_BRIDGE_EBT) += ebtables.o
+obj-$(CONFIG_BRIDGE_EBT_T_FILTER) += ebtable_filter.o
+obj-$(CONFIG_BRIDGE_EBT_T_NAT) += ebtable_nat.o
+obj-$(CONFIG_BRIDGE_EBT_BROUTE) += ebtable_broute.o
+obj-$(CONFIG_BRIDGE_DB) += br_db.o
+obj-$(CONFIG_BRIDGE_EBT_IPF) += ebt_ip.o
+obj-$(CONFIG_BRIDGE_EBT_ARPF) += ebt_arp.o
+obj-$(CONFIG_BRIDGE_EBT_VLANF) += ebt_vlan.o
+obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_log.o
+obj-$(CONFIG_BRIDGE_EBT_SNAT) += ebt_snat.o
+obj-$(CONFIG_BRIDGE_EBT_DNAT) += ebt_dnat.o
+obj-$(CONFIG_BRIDGE_EBT_REDIRECT) += ebt_redirect.o
+include $(TOPDIR)/Rules.make
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/Config.in	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,16 @@
+#
+# Bridge netfilter configuration
+#
+dep_tristate '  Bridge: ebtables' CONFIG_BRIDGE_EBT $CONFIG_BRIDGE
+dep_tristate '    ebt: filter table support' CONFIG_BRIDGE_EBT_T_FILTER $CONFIG_BRIDGE_EBT
+dep_tristate '    ebt: nat table support' CONFIG_BRIDGE_EBT_T_NAT $CONFIG_BRIDGE_EBT
+dep_tristate '    ebt: broute table support' CONFIG_BRIDGE_EBT_BROUTE $CONFIG_BRIDGE_EBT
+dep_tristate '    ebt: LOG support' CONFIG_BRIDGE_EBT_LOG $CONFIG_BRIDGE_EBT
+dep_tristate '    ebt: IP filter support' CONFIG_BRIDGE_EBT_IPF $CONFIG_BRIDGE_EBT
+dep_tristate '    ebt: ARP filter support' CONFIG_BRIDGE_EBT_ARPF $CONFIG_BRIDGE_EBT
+dep_tristate '    ebt: 802.1Q VLAN filter support (EXPERIMENTAL)' CONFIG_BRIDGE_EBT_VLANF $CONFIG_BRIDGE_EBT
+dep_tristate '    ebt: snat target support' CONFIG_BRIDGE_EBT_SNAT $CONFIG_BRIDGE_EBT
+dep_tristate '    ebt: dnat target support' CONFIG_BRIDGE_EBT_DNAT $CONFIG_BRIDGE_EBT
+dep_tristate '    ebt: redirect target support' CONFIG_BRIDGE_EBT_REDIRECT $CONFIG_BRIDGE_EBT
+dep_tristate '  Bridge: ethernet database' CONFIG_BRIDGE_DB $CONFIG_BRIDGE
+
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/br_db.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,357 @@
+/*
+ *  bridge ethernet protocol database
+ *
+ *	Authors:
+ *	Bart De Schuymer		<bart.de.schuymer@pandora.be>
+ *
+ *  br_db.c, April, 2002
+ *
+ *  This code is stongly inspired on the iptables code which is
+ *  Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/skbuff.h>
+#include <linux/if_ether.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/br_db.h>
+#include <linux/socket.h> /* PF_BRIDGE */
+#include <linux/spinlock.h> /* rwlock_t */
+#include <asm/errno.h>
+#include <asm/uaccess.h> /* copy_[to,from]_user */
+#include <linux/smp.h> /* multiprocessors */
+
+#define BUGPRINT(format, args...) printk("kernel msg: brdb bug: please report to author: "format, ## args)
+/*#define BUGPRINT(format, args...)*/
+#define MEMPRINT(format, args...) printk("kernel msg: brdb : out of memory: "format, ## args)
+/*#define MEMPRINT(format, args...)*/
+
+/* database variables */
+static __u16 allowdb = BRDB_NODB;
+static struct brdb_dbentry **flowdb = NULL;
+static unsigned int *dbsize;
+static unsigned int *dbnum;
+/* database lock */
+static rwlock_t brdb_dblock;
+
+static inline int brdb_dev_check(char *entry, const struct net_device *device){
+	if (*entry == '\0') return 0;
+	if (!device) return 1;
+	return strncmp(entry, device->name, IFNAMSIZ);
+}	
+
+static inline int brdb_proto_check(unsigned int a, unsigned int b){
+	if (a == b || ( a == IDENTIFY802_3 && ntohs(b) < 1536 )) return 0;
+	return 1;
+}
+
+static unsigned int maintaindb (unsigned int hook, struct sk_buff **pskb,
+			const struct net_device *in,
+			const struct net_device *out,
+			int (*okfn)(struct sk_buff *))
+{
+	struct brdb_dbentry *hlp;
+	int i, cpunr;
+	unsigned short ethproto = ((**pskb).mac.ethernet)->h_proto;
+
+	cpunr = cpu_number_map(smp_processor_id());
+
+	read_lock_bh(&brdb_dblock);
+
+	if (allowdb == BRDB_NODB) {// must be after readlock
+		read_unlock_bh(&brdb_dblock);
+		return NF_ACCEPT;
+	}
+	hlp = flowdb[cpunr];
+	/* search for existing entry */
+	for (i = 0; i < dbnum[cpunr]; i++) {
+		if (hlp->hook == hook && !brdb_proto_check(hlp->ethproto, ethproto) &&
+			  !brdb_dev_check(hlp->in, in) && !brdb_dev_check(hlp->out, out)) {
+			read_unlock_bh(&brdb_dblock);
+			return NF_ACCEPT;
+		}
+		hlp++;
+	}
+	/* add new entry to database */
+	if (dbnum[cpunr] == dbsize[cpunr]) {
+		dbsize[cpunr] *= 2;
+		if ( !( hlp = (struct brdb_dbentry *) vmalloc(dbsize[cpunr] * sizeof(struct brdb_dbentry)) ) ) {
+			dbsize[cpunr] /= 2;
+			MEMPRINT("maintaindb && nomemory\n");
+			read_unlock_bh(&brdb_dblock);
+			return NF_ACCEPT;
+		}
+		memcpy(hlp, flowdb[cpunr], dbnum[cpunr] * sizeof(struct brdb_dbentry));
+		vfree(flowdb[cpunr]);
+		flowdb[cpunr] = hlp;
+	}
+
+	hlp = flowdb[cpunr] + dbnum[cpunr];
+	hlp->hook = hook;
+	if (in)
+		strncpy(hlp->in, in->name, IFNAMSIZ);
+	else
+		hlp->in[0] = '\0';
+	if (out)
+		strncpy(hlp->out, out->name, IFNAMSIZ);
+	else
+		hlp->out[0] = '\0';
+	if (ntohs(ethproto) < 1536)
+		hlp->ethproto = IDENTIFY802_3;
+	else
+		hlp->ethproto = ethproto;
+	dbnum[cpunr]++;
+
+	read_unlock_bh(&brdb_dblock);
+
+	return NF_ACCEPT;
+}
+
+static int copy_db(void *user, int *len)
+{
+	int i, j, nentries = 0, ret;
+	struct brdb_dbentry *begin, *end1, *end2, *point, *point2;
+
+	write_lock_bh(&brdb_dblock);
+	for (i = 0; i < smp_num_cpus; i++)
+		nentries += dbnum[i];
+	if (*len > nentries)
+		return -EINVAL;
+
+	if ( !(begin = (struct brdb_dbentry *) vmalloc((*len) * sizeof(struct brdb_dbentry))) )
+		return -ENOMEM;
+	memcpy(begin, flowdb[0], dbnum[0] * sizeof(struct brdb_dbentry));
+	end1 = begin + dbnum[0];
+	for (i = 1; i < smp_num_cpus; i++) {/* cycle databases per cpu */
+		point2 = flowdb[i];
+		end2 = end1;
+		for (j = 0; j < dbnum[i]; j++) {/* cycle entries of a cpu's database (point2) */
+			for (point = begin; point != end2; point++)/* cycle different entries we found so far */
+				if (point->hook == point2->hook && !strncmp(point->in, point2->in, IFNAMSIZ) &&
+				    !strncmp(point->out, point2->out, IFNAMSIZ) && point->ethproto == point2->ethproto)
+					goto out;/* already exists in a database of another cpu */
+
+			memcpy(end1, point2, sizeof(struct brdb_dbentry));
+			end1++;
+out:
+			point2++;
+		}
+	}
+	write_unlock_bh(&brdb_dblock);
+	i = (int)( (char *)end1 - (char *)begin);
+	*len = i < *len ? i : *len;
+	if (copy_to_user(user, begin, *len * sizeof(struct brdb_dbentry)) != 0)
+		ret = -EFAULT;
+	else
+		ret = 0;
+	vfree(begin);
+	return ret;
+}
+
+static int switch_nodb(void){
+	int i;
+
+	if (!flowdb)
+		BUGPRINT("switch_nodb && !flowdb\n");
+	for (i = 0; i < smp_num_cpus; i++)
+		vfree(flowdb[i]);
+	vfree(flowdb);
+	if (!dbsize)
+		BUGPRINT("switch_nodb && !dbsize\n");
+	vfree(dbsize);
+	if (!dbnum)
+		BUGPRINT("switch_nodb && !dbnum\n");
+	vfree(dbnum);
+	flowdb = NULL;
+	allowdb = BRDB_NODB;
+	return 0;
+}
+
+static int switch_db(void)
+{
+	int i, j;
+
+	if (flowdb) BUGPRINT("switch_db && flowdb\n");
+	if ( !(flowdb = (struct brdb_dbentry **) vmalloc(smp_num_cpus * sizeof(struct brdb_dbentry *))) ) {
+		MEMPRINT("switch_db && nomemory\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < smp_num_cpus; i++)
+		if ( !(flowdb[i] = (struct brdb_dbentry *) vmalloc(INITIAL_DBSIZE * sizeof(struct brdb_dbentry))) )
+			goto sw_free1;
+		else
+			memset(flowdb[i], 0, INITIAL_DBSIZE * sizeof(struct brdb_dbentry));
+
+	if ( !(dbnum = (int*) vmalloc(smp_num_cpus * sizeof(int))) )
+		goto sw_free2;
+
+	if ( !(dbsize = (int*) vmalloc(smp_num_cpus * sizeof(int))) )
+		goto sw_free3;
+
+	for (i = 0; i < smp_num_cpus; i++) {
+		dbnum[i] = 0;
+		dbsize[i] = INITIAL_DBSIZE;
+	}
+	allowdb = BRDB_DB;
+	return 0;
+
+sw_free3:
+	MEMPRINT("switch_db && nomemory2\n");
+	vfree(dbnum);
+	dbnum = NULL;
+sw_free2:
+	MEMPRINT("switch_db && nomemory3\n");
+sw_free1:
+	MEMPRINT("switch_db && nomemory4\n");
+	for (j = 0; j<i; j++)
+		vfree(flowdb[j]);
+	vfree(flowdb);
+	allowdb = BRDB_NODB;
+	return -ENOMEM;
+}
+
+static int
+do_brdb_set_ctl(struct sock *sk, int cmd, void *user, unsigned int len)
+{
+	int ret;
+	__u16 adb;
+	switch(cmd) {
+	case BRDB_SO_SET_ALLOWDB:
+		if (len != sizeof(__u16)) {
+			ret = -EINVAL;
+			break;
+		}
+	 	if (copy_from_user(&adb, user, len) != 0) {
+			ret = -EFAULT;
+	 		break;
+		}
+		if (adb != BRDB_DB && adb != BRDB_NODB) {
+			ret = -EINVAL;
+			break;
+		}
+		write_lock_bh(&brdb_dblock);
+		if (adb == allowdb) {
+			ret = 0;
+			write_unlock_bh(&brdb_dblock);
+			break;
+		}
+		if (allowdb == BRDB_DB)
+			ret = switch_nodb();
+		else
+			ret = switch_db();
+		write_unlock_bh(&brdb_dblock);
+		break;
+
+	default:
+		ret = -EINVAL;
+	}
+	return ret;
+}
+
+static int
+do_brdb_get_ctl(struct sock *sk, int cmd, void *user, int *len)
+{
+	struct brdb_dbinfo help2;
+	int i, ret;
+	switch(cmd) {
+	case BRDB_SO_GET_DBINFO:
+		if (sizeof(struct brdb_dbinfo) != *len)
+			return -EINVAL;
+		write_lock_bh(&brdb_dblock);
+		/* 0 == no database
+		 * i-1 == number of entries (if database)
+		 */
+		if (allowdb == BRDB_NODB)
+			help2.nentries = 0;
+		else {
+			help2.nentries = 1;
+			for (i = 0; i < smp_num_cpus; i++)
+				help2.nentries += dbnum[i];
+		}
+		write_unlock_bh(&brdb_dblock);
+		if (copy_to_user(user, &help2, sizeof(help2)) != 0)
+			ret = -EFAULT;
+		else
+			ret = 0;
+		break;
+
+	case BRDB_SO_GET_DB:
+		if (*len == 0 || allowdb == BRDB_NODB)
+			return -EINVAL;
+		ret = copy_db(user, len);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static struct nf_sockopt_ops brdb_sockopts
+= { { NULL, NULL }, PF_INET, BRDB_BASE_CTL, BRDB_SO_SET_MAX+1, do_brdb_set_ctl,
+    BRDB_BASE_CTL, BRDB_SO_GET_MAX+1, do_brdb_get_ctl, 0, NULL  };
+
+
+static struct nf_hook_ops brdb_br_ops[] = {
+	{ { NULL, NULL }, maintaindb, PF_BRIDGE, NF_BR_PRE_ROUTING, -250},
+	{ { NULL, NULL }, maintaindb, PF_BRIDGE, NF_BR_LOCAL_IN, -250},
+	{ { NULL, NULL }, maintaindb, PF_BRIDGE, NF_BR_FORWARD, -250},
+	{ { NULL, NULL }, maintaindb, PF_BRIDGE, NF_BR_LOCAL_OUT, -250},
+	{ { NULL, NULL }, maintaindb, PF_BRIDGE, NF_BR_POST_ROUTING, -250}
+};
+
+static int __init init(void)
+{
+	int ret;
+
+	if ((ret = nf_register_hook(&brdb_br_ops[0])) < 0)
+		return ret;
+
+	if ((ret = nf_register_hook(&brdb_br_ops[1])) < 0)
+		goto clean0;
+
+	if ((ret = nf_register_hook(&brdb_br_ops[2])) < 0)
+		goto clean1;
+
+	if ((ret = nf_register_hook(&brdb_br_ops[3])) < 0)
+		goto clean2;
+
+	if ((ret = nf_register_hook(&brdb_br_ops[4])) < 0)
+		goto clean3;
+
+	/* Register setsockopt */
+	if ((ret = nf_register_sockopt(&brdb_sockopts)) < 0)
+		goto clean4;
+	
+	rwlock_init(&brdb_dblock);
+	printk("Bridge ethernet database registered\n");
+	return ret;
+
+clean4:		nf_unregister_hook(&brdb_br_ops[4]);
+clean3:		nf_unregister_hook(&brdb_br_ops[3]);
+clean2:		nf_unregister_hook(&brdb_br_ops[2]);
+clean1:		nf_unregister_hook(&brdb_br_ops[1]);
+clean0:		nf_unregister_hook(&brdb_br_ops[0]);
+
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	nf_unregister_hook(&brdb_br_ops[4]);
+	nf_unregister_hook(&brdb_br_ops[3]);
+	nf_unregister_hook(&brdb_br_ops[2]);
+	nf_unregister_hook(&brdb_br_ops[1]);
+	nf_unregister_hook(&brdb_br_ops[0]);
+	nf_unregister_sockopt(&brdb_sockopts);
+}
+
+module_init(init);
+module_exit(fini);
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebtable_filter.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,92 @@
+/*
+ *  ebtable_filter
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/module.h>
+
+#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
+   (1 << NF_BR_LOCAL_OUT))
+
+static struct ebt_entries initial_chains[] =
+{
+  {0, "INPUT", 0, EBT_ACCEPT, 0},
+  {0, "FORWARD", 0, EBT_ACCEPT, 0},
+  {0, "OUTPUT", 0, EBT_ACCEPT, 0}
+};
+
+static struct ebt_replace initial_table =
+{
+  "filter", FILTER_VALID_HOOKS, 0, 3 * sizeof(struct ebt_entries),
+  { [NF_BR_LOCAL_IN]&initial_chains[0], [NF_BR_FORWARD]&initial_chains[1],
+    [NF_BR_LOCAL_OUT]&initial_chains[2] }, 0, NULL, (char *)initial_chains
+};
+
+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
+{
+	if (valid_hooks & ~FILTER_VALID_HOOKS)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_table frame_filter =
+{ 
+  {NULL, NULL}, "filter", &initial_table, FILTER_VALID_HOOKS, 
+  RW_LOCK_UNLOCKED, check, NULL
+};
+
+static unsigned int ebt_hook (unsigned int hook, struct sk_buff **pskb,
+			const struct net_device *in,
+			const struct net_device *out,
+			int (*okfn)(struct sk_buff *))
+{
+	return ebt_do_table(hook, pskb, in, out, &frame_filter);
+}
+
+static struct nf_hook_ops ebt_ops_filter[] = {
+	{ { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_LOCAL_IN,
+	   NF_BR_PRI_FILTER_BRIDGED},
+	{ { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_FORWARD,
+	   NF_BR_PRI_FILTER_BRIDGED},
+	{ { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_LOCAL_OUT,
+	   NF_BR_PRI_FILTER_OTHER}
+};
+
+static int __init init(void)
+{
+	int i, j, ret;
+
+	ret = ebt_register_table(&frame_filter);
+	if (ret < 0)
+		return ret;
+	for (i = 0; i < sizeof(ebt_ops_filter) / sizeof(ebt_ops_filter[0]); i++)
+		if ((ret = nf_register_hook(&ebt_ops_filter[i])) < 0)
+			goto cleanup;
+	return ret;
+cleanup:
+	for (j = 0; j < i; j++)
+		nf_unregister_hook(&ebt_ops_filter[j]);
+	ebt_unregister_table(&frame_filter);
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	int i;
+
+	for (i = 0; i < sizeof(ebt_ops_filter) / sizeof(ebt_ops_filter[0]); i++)
+		nf_unregister_hook(&ebt_ops_filter[i]);
+	ebt_unregister_table(&frame_filter);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebtable_nat.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,155 @@
+/*
+ *  ebtable_nat
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/netdevice.h>
+#include <linux/module.h>
+#define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
+   (1 << NF_BR_POST_ROUTING))
+
+static struct ebt_entries initial_chains[] =
+{
+  {0, "PREROUTING", 0, EBT_ACCEPT, 0},
+  {0, "OUTPUT", 0, EBT_ACCEPT, 0},
+  {0, "POSTROUTING", 0, EBT_ACCEPT, 0}
+};
+
+static struct ebt_replace initial_table =
+{
+  "nat", NAT_VALID_HOOKS, 0, 3 * sizeof(struct ebt_entries),
+  { [NF_BR_PRE_ROUTING]&initial_chains[0], [NF_BR_LOCAL_OUT]&initial_chains[1],
+    [NF_BR_POST_ROUTING]&initial_chains[2] }, 0, NULL, (char *)initial_chains
+};
+
+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
+{
+	if (valid_hooks & ~NAT_VALID_HOOKS)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_table frame_nat =
+{
+  {NULL, NULL}, "nat", &initial_table, NAT_VALID_HOOKS,
+  RW_LOCK_UNLOCKED, check, NULL
+};
+
+// used for snat to know if the frame comes from FORWARD or LOCAL_OUT.
+// needed because of the bridge-nf patch (that allows use of iptables
+// on bridged traffic)
+// if the packet is routed, we want the ebtables stuff on POSTROUTING
+// to be executed _after_ the iptables stuff. when it's bridged, it's
+// the way around
+static struct net_device __fake_net_device = {
+        hard_header_len:        ETH_HLEN
+};
+
+static unsigned int
+ebt_nat_dst (unsigned int hook, struct sk_buff **pskb,
+   const struct net_device *in, const struct net_device *out,
+   int (*okfn)(struct sk_buff *))
+{
+	return ebt_do_table(hook, pskb, in, out, &frame_nat);
+}
+
+// let snat know this frame is routed
+static unsigned int ebt_clear_physin (unsigned int hook, struct sk_buff **pskb,
+   const struct net_device *in, const struct net_device *out,
+   int (*okfn)(struct sk_buff *))
+{
+	(*pskb)->physindev = NULL;
+	return NF_ACCEPT;
+}
+
+// let snat know this frame is bridged
+static unsigned int ebt_set_physin (unsigned int hook, struct sk_buff **pskb,
+   const struct net_device *in, const struct net_device *out,
+   int (*okfn)(struct sk_buff *))
+{
+	(*pskb)->physindev = &__fake_net_device;
+	return NF_ACCEPT;
+}
+
+static unsigned int ebt_nat_src (unsigned int hook, struct sk_buff **pskb,
+			const struct net_device *in,
+			const struct net_device *out,
+			int (*okfn)(struct sk_buff *))
+{
+	// this is a routed packet
+	if ((*pskb)->physindev == NULL)
+		return NF_ACCEPT;
+	if ((*pskb)->physindev != &__fake_net_device)
+		printk("ebtables (br_nat_src): physindev hack "
+		       "doesn't work - BUG\n");
+
+	return ebt_do_table(hook, pskb, in, out, &frame_nat);
+}
+
+static unsigned int ebt_nat_src_route (unsigned int hook, struct sk_buff **pskb,
+   const struct net_device *in, const struct net_device *out,
+   int (*okfn)(struct sk_buff *))
+{
+	// this is a bridged packet
+	if ((*pskb)->physindev == &__fake_net_device)
+		return NF_ACCEPT;
+	if ((*pskb)->physindev)
+		printk("ebtables (br_nat_src_route): physindev hack "
+		       "doesn't work - BUG\n");
+
+	return ebt_do_table(hook, pskb, in, out, &frame_nat);
+}
+
+static struct nf_hook_ops ebt_ops_nat[] = {
+	{ { NULL, NULL }, ebt_nat_dst, PF_BRIDGE, NF_BR_LOCAL_OUT,
+	   NF_BR_PRI_NAT_DST_OTHER},
+	{ { NULL, NULL }, ebt_nat_src, PF_BRIDGE, NF_BR_POST_ROUTING,
+	   NF_BR_PRI_NAT_SRC_BRIDGED},
+	{ { NULL, NULL }, ebt_nat_src_route, PF_BRIDGE, NF_BR_POST_ROUTING,
+	   NF_BR_PRI_NAT_SRC_OTHER},
+	{ { NULL, NULL }, ebt_nat_dst, PF_BRIDGE, NF_BR_PRE_ROUTING,
+	   NF_BR_PRI_NAT_DST_BRIDGED},
+	{ { NULL, NULL }, ebt_clear_physin, PF_BRIDGE, NF_BR_LOCAL_OUT,
+	   NF_BR_PRI_FILTER_OTHER + 1},
+	{ { NULL, NULL }, ebt_set_physin, PF_BRIDGE, NF_BR_FORWARD,
+	   NF_BR_PRI_FILTER_OTHER + 1}
+};
+
+static int __init init(void)
+{
+	int i, ret, j;
+
+	ret = ebt_register_table(&frame_nat);
+	if (ret < 0)
+		return ret;
+	for (i = 0; i < sizeof(ebt_ops_nat) / sizeof(ebt_ops_nat[0]); i++)
+		if ((ret = nf_register_hook(&ebt_ops_nat[i])) < 0)
+			goto cleanup;
+	return ret;
+cleanup:
+	for (j = 0; j < i; j++)
+		nf_unregister_hook(&ebt_ops_nat[j]);
+	ebt_unregister_table(&frame_nat);
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	int i;
+
+	for (i = 0; i < sizeof(ebt_ops_nat) / sizeof(ebt_ops_nat[0]); i++)
+		nf_unregister_hook(&ebt_ops_nat[i]);
+	ebt_unregister_table(&frame_nat);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebtable_broute.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,79 @@
+/*
+ *  ebtable_broute
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
+ *  April, 2002
+ *
+ *  This table lets you choose between routing and bridging for frames
+ *  entering on a bridge enslaved nic. This table is traversed before any
+ *  other ebtables table. See net/bridge/br_input.c.
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/netdevice.h>
+#include <linux/module.h>
+#include <linux/if_bridge.h>
+#include <linux/brlock.h>
+
+// EBT_ACCEPT means the frame will be bridged
+// EBT_DROP means the frame will be routed
+static struct ebt_entries initial_chain =
+  {0, "BROUTE", 0, EBT_ACCEPT, 0};
+
+static struct ebt_replace initial_table =
+{
+  "broute", 1 << NF_BR_BROUTING, 0, sizeof(struct ebt_entries),
+  { [NF_BR_BROUTING]&initial_chain}, 0, NULL, (char *)&initial_chain
+};
+
+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
+{
+	if (valid_hooks & ~(1 << NF_BR_BROUTING))
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_table broute_table =
+{
+  {NULL, NULL}, "broute", &initial_table, 1 << NF_BR_BROUTING,
+  RW_LOCK_UNLOCKED, check, NULL
+};
+
+static unsigned int
+ebt_broute (unsigned int hook, struct sk_buff **pskb,
+			const struct net_device *in,
+			const struct net_device *out,
+			int (*okfn)(struct sk_buff *))
+{
+	return ebt_do_table(hook, pskb, in, out, &broute_table);
+}
+
+static int __init init(void)
+{
+	int ret;
+
+	ret = ebt_register_table(&broute_table);
+	if (ret < 0)
+		return ret;
+	br_write_lock_bh(BR_NETPROTO_LOCK);
+	// in br_input.c, br_handle_frame() wants to call broute_decision()
+	broute_decision = ebt_broute;
+	br_write_unlock_bh(BR_NETPROTO_LOCK);
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	br_write_lock_bh(BR_NETPROTO_LOCK);
+	broute_decision = NULL;
+	br_write_unlock_bh(BR_NETPROTO_LOCK);
+	ebt_unregister_table(&broute_table);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebt_redirect.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,65 @@
+/*
+ *  ebt_redirect
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_redirect.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/skbuff.h>
+#include <linux/module.h>
+#include <net/sock.h>
+#include "../br_private.h"
+
+static int ebt_target_redirect(struct sk_buff **pskb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_redirect_info *infostuff = (struct ebt_redirect_info *) data;
+
+	memcpy((**pskb).mac.ethernet->h_dest,
+	   in->br_port->br->dev.dev_addr, ETH_ALEN);
+	(*pskb)->pkt_type = PACKET_HOST;
+	return infostuff->target;
+}
+
+static int ebt_target_redirect_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_redirect_info *infostuff = (struct ebt_redirect_info *) data;
+
+	if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) &&
+	     (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
+		return -EINVAL;
+	if (datalen != sizeof(struct ebt_redirect_info))
+		return -EINVAL;
+	if (infostuff->target < -NUM_STANDARD_TARGETS || infostuff->target >= 0)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_target redirect_target =
+{
+	{NULL, NULL}, EBT_REDIRECT_TARGET, ebt_target_redirect,
+	ebt_target_redirect_check, NULL, THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ebt_register_target(&redirect_target);
+}
+
+static void __exit fini(void)
+{
+	ebt_unregister_target(&redirect_target);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebt_arp.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,107 @@
+/*
+ *  ebt_arp
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *	Tim Gardner <timg@tpi.com>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_arp.h>
+#include <linux/if_arp.h>
+#include <linux/module.h>
+
+#define FWINV2(bool,invflg) ((bool) ^ !!(infostuff->invflags & invflg))
+static int ebt_filter_arp(const struct sk_buff *skb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const void *data,
+	       unsigned int datalen, const struct ebt_counter *c)
+{
+	struct ebt_arp_info *infostuff = (struct ebt_arp_info *)data;
+
+	if (infostuff->bitmask & EBT_ARP_OPCODE && FWINV2(infostuff->opcode !=
+	   ((*skb).nh.arph)->ar_op, EBT_ARP_OPCODE))
+		return 1;
+	if (infostuff->bitmask & EBT_ARP_HTYPE && FWINV2(infostuff->htype !=
+	   ((*skb).nh.arph)->ar_hrd, EBT_ARP_HTYPE))
+		return 1;
+	if (infostuff->bitmask & EBT_ARP_PTYPE && FWINV2(infostuff->ptype !=
+	   ((*skb).nh.arph)->ar_pro, EBT_ARP_PTYPE))
+		return 1;
+
+	if (infostuff->bitmask & (EBT_ARP_SRC_IP | EBT_ARP_DST_IP))
+	{
+		__u32 arp_len = sizeof(struct arphdr) +
+		   (2*(((*skb).nh.arph)->ar_hln)) +
+		   (2*(((*skb).nh.arph)->ar_pln));
+		__u32 dst;
+		__u32 src;
+
+ 		// Make sure the packet is long enough.
+		if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
+			return 1;
+		// IPV4 addresses are always 4 bytes.
+		if (((*skb).nh.arph)->ar_pln != sizeof(__u32))
+			return 1;
+
+		if (infostuff->bitmask & EBT_ARP_SRC_IP) {
+			memcpy(&src, ((*skb).nh.raw) + sizeof(struct arphdr) +
+			   ((*skb).nh.arph)->ar_hln, sizeof(__u32));
+			if (FWINV2(infostuff->saddr != (src & infostuff->smsk),
+			   EBT_ARP_SRC_IP))
+				return 1;
+		}
+
+		if (infostuff->bitmask & EBT_ARP_DST_IP) {
+			memcpy(&dst, ((*skb).nh.raw)+sizeof(struct arphdr) +
+			   (2*(((*skb).nh.arph)->ar_hln)) +
+			   (((*skb).nh.arph)->ar_pln), sizeof(__u32));
+			if (FWINV2(infostuff->daddr != (dst & infostuff->dmsk),
+			   EBT_ARP_DST_IP))
+				return 1;
+		}
+	}
+	return 0;
+}
+
+static int ebt_arp_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_arp_info *infostuff = (struct ebt_arp_info *) data;
+
+	if (datalen != sizeof(struct ebt_arp_info))
+		return -EINVAL;
+	if (e->bitmask & (EBT_NOPROTO | EBT_802_3) || 
+	   (e->ethproto != __constant_htons(ETH_P_ARP) && 
+	    e->ethproto != __constant_htons(ETH_P_RARP)) ||
+	   e->invflags & EBT_IPROTO)
+		return -EINVAL;
+	if (infostuff->bitmask & ~EBT_ARP_MASK)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_match filter_arp =
+{
+	{NULL, NULL}, EBT_ARP_MATCH, ebt_filter_arp, ebt_arp_check, NULL,
+	THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ebt_register_match(&filter_arp);
+}
+
+static void __exit fini(void)
+{
+	ebt_unregister_match(&filter_arp);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebt_ip.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,81 @@
+/*
+ *  ebt_ip
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_ip.h>
+#include <linux/ip.h>
+#include <linux/module.h>
+
+#define FWINV2(bool,invflg) ((bool) ^ !!(infostuff->invflags & invflg))
+static int ebt_filter_ip(const struct sk_buff *skb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const void *data,
+	       unsigned int datalen, const struct ebt_counter *c)
+{
+	struct ebt_ip_info *infostuff = (struct ebt_ip_info *) data;
+
+	if (infostuff->bitmask & EBT_IP_TOS &&
+	   FWINV2(infostuff->tos != ((*skb).nh.iph)->tos, EBT_IP_TOS))
+		return 1;
+	if (infostuff->bitmask & EBT_IP_PROTO && FWINV2(infostuff->protocol !=
+	   ((*skb).nh.iph)->protocol, EBT_IP_PROTO))
+		return 1;
+	if (infostuff->bitmask & EBT_IP_SOURCE &&
+	   FWINV2((((*skb).nh.iph)->saddr & infostuff->smsk) !=
+	   infostuff->saddr, EBT_IP_SOURCE))
+		return 1;
+	if ((infostuff->bitmask & EBT_IP_DEST) &&
+	   FWINV2((((*skb).nh.iph)->daddr & infostuff->dmsk) !=
+	   infostuff->daddr, EBT_IP_DEST))
+		return 1;
+	return 0;
+}
+
+static int ebt_ip_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_ip_info *infostuff = (struct ebt_ip_info *) data;
+
+	if (datalen != sizeof(struct ebt_ip_info)) {
+		return -EINVAL;
+	}
+	if (e->bitmask & (EBT_NOPROTO | EBT_802_3) || 
+	    e->ethproto != __constant_htons(ETH_P_IP) ||
+	    e->invflags & EBT_IPROTO)
+	{
+		return -EINVAL;
+	}
+	if (infostuff->bitmask & ~EBT_IP_MASK) {
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static struct ebt_match filter_ip =
+{
+	{NULL, NULL}, EBT_IP_MATCH, ebt_filter_ip, ebt_ip_check, NULL,
+	THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ebt_register_match(&filter_ip);
+}
+
+static void __exit fini(void)
+{
+	ebt_unregister_match(&filter_ip);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebt_vlan.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,152 @@
+/*
+ *  ebt_vlan kernelspace
+ *
+ *      Authors:
+ *      Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *      Nick Fedchik <nick@fedchik.org.ua>
+ *
+ *      June, 2002
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_vlan.h>
+#include <linux/if_vlan.h>
+#include <linux/if_ether.h>
+#include <linux/module.h>
+
+static unsigned char debug;
+MODULE_PARM (debug, "0-1b");
+MODULE_PARM_DESC (debug, "debug=1 is turn on debug messages");
+
+#define MODULE_VERSION "0.2"
+
+static int ebt_filter_vlan (const struct sk_buff *skb,
+			    const struct net_device *in,
+			    const struct net_device *out,
+			    const void *data,
+			    unsigned int datalen,
+			    const struct ebt_counter *c)
+{
+	struct ebt_vlan_info *infostuff = (struct ebt_vlan_info *) data;
+	struct vlan_ethhdr *vlanethhdr =
+	    (struct vlan_ethhdr *) skb->mac.raw;
+	unsigned short v_id;
+	unsigned short v_prio;
+	unsigned short v_TCI;
+
+	/*
+	 * Calculate 802.1Q VLAN ID and user_priority from 
+	 * Tag Control Information (TCI) field.
+	 * Reserved one bit (13) for CFI (Canonical Format Indicator)
+	 */
+	v_TCI = ntohs (vlanethhdr->h_vlan_TCI);
+	v_id = v_TCI & 0xFFF;
+	v_prio = v_TCI >> 13;
+
+	/*
+	 * Checking VLANs 
+	 */
+	if (infostuff->bitmask & EBT_VLAN_ID) {	/* Is VLAN ID parsed? */
+		if (!((infostuff->id == v_id)
+		      ^ !!(infostuff->invflags & EBT_VLAN_ID)))
+			return 1;
+		if (debug)
+			printk (KERN_DEBUG
+				"ebt_vlan: matched ID=%s%d (mask=%X)\n",
+				(infostuff->
+				 invflags & EBT_VLAN_ID) ? "!" : "",
+				infostuff->id, infostuff->bitmask);
+	}
+	/*
+	 * Checking User Priority 
+	 */
+	if (infostuff->bitmask & EBT_VLAN_PRIO) {	/* Is VLAN Prio parsed? */
+		if (!((infostuff->prio == v_prio)
+		      ^ !!(infostuff->invflags & EBT_VLAN_PRIO)))
+			return 1;	/* missed */
+		if (debug)
+			printk (KERN_DEBUG
+				"ebt_vlan: matched Prio=%s%d (mask=%X)\n",
+				(infostuff->
+				 invflags & EBT_VLAN_PRIO) ? "!" : "",
+				infostuff->prio, infostuff->bitmask);
+	}
+	/*
+	 * Checking for Encapsulated proto
+	 */
+	if (infostuff->bitmask & EBT_VLAN_ENCAP) {	/* Is VLAN Encap parsed? */
+		if (!
+		    ((infostuff->encap ==
+		      vlanethhdr->h_vlan_encapsulated_proto)
+		     ^ !!(infostuff->invflags & EBT_VLAN_ENCAP)))
+			return 1;	/* missed */
+		if (debug)
+			printk (KERN_DEBUG
+				"ebt_vlan: matched encap=%s%2.4X (mask=%X)\n",
+				(infostuff->
+				 invflags & EBT_VLAN_ENCAP) ? "!" : "",
+				ntohs (infostuff->encap),
+				infostuff->bitmask);
+	}
+
+	/*
+	 * rule matched 
+	 */
+	return 0;
+}
+
+/*
+ * ebt_vlan_check() is called when userspace delivers the table to the kernel, 
+ * * it is called to check that userspace doesn't give a bad table.
+ */
+static int ebt_vlan_check (const char *tablename, unsigned int hookmask,
+			   const struct ebt_entry *e, void *data,
+			   unsigned int datalen)
+{
+	struct ebt_vlan_info *infostuff = (struct ebt_vlan_info *) data;
+
+	if (datalen != sizeof (struct ebt_vlan_info))
+		return -EINVAL;
+
+	if (e->ethproto != __constant_htons (ETH_P_8021Q))
+		return -EINVAL;
+
+	if (infostuff->bitmask & ~EBT_VLAN_MASK) {
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct ebt_match filter_vlan = {
+	{NULL, NULL},
+	EBT_VLAN_MATCH,
+	ebt_filter_vlan,
+	ebt_vlan_check,
+	NULL,
+	THIS_MODULE
+};
+
+static int __init init (void)
+{
+	printk (KERN_INFO
+		"ebt_vlan: 802.1Q VLAN matching module for EBTables "
+		MODULE_VERSION "\n");
+	if (debug)
+		printk (KERN_DEBUG
+			"ebt_vlan: 802.1Q rule matching debug is on\n");
+	return ebt_register_match (&filter_vlan);
+}
+
+static void __exit fini (void)
+{
+	ebt_unregister_match (&filter_vlan);
+}
+
+module_init (init);
+module_exit (fini);
+EXPORT_NO_SYMBOLS;
+MODULE_AUTHOR ("Nick Fedchik <nick@fedchik.org.ua>");
+MODULE_DESCRIPTION ("802.1Q VLAN matching module for ebtables, v"
+		    MODULE_VERSION);
+MODULE_LICENSE ("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebt_log.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,111 @@
+/*
+ *  ebt_log
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_log.h>
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/if_arp.h>
+#include <linux/spinlock.h>
+
+static spinlock_t ebt_log_lock = SPIN_LOCK_UNLOCKED;
+
+static int ebt_log_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_log_info *loginfo = (struct ebt_log_info *)data;
+
+	if (datalen != sizeof(struct ebt_log_info))
+		return -EINVAL;
+	if (loginfo->bitmask & ~EBT_LOG_MASK)
+		return -EINVAL;
+	if (loginfo->loglevel >= 8)
+		return -EINVAL;
+	loginfo->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
+	return 0;
+}
+
+static void ebt_log(const struct sk_buff *skb, const struct net_device *in,
+   const struct net_device *out, const void *data, unsigned int datalen,
+   const struct ebt_counter *c)
+{
+	struct ebt_log_info *loginfo = (struct ebt_log_info *)data;
+	char level_string[4] = "< >";
+	level_string[1] = '0' + loginfo->loglevel;
+
+	spin_lock_bh(&ebt_log_lock);
+	printk(level_string);
+	// max length: 29 + 10 + 2 * 16
+	printk("%s IN=%s OUT=%s ",
+	       loginfo->prefix,
+	       in ? in->name : "",
+	       out ? out->name : "");
+
+	if (skb->dev->hard_header_len) {
+		int i;
+		unsigned char *p = (skb->mac.ethernet)->h_source;
+		printk("MAC source = ");
+		for (i = 0; i < ETH_ALEN; i++,p++)
+			printk("%02x%c", *p,
+			       i == ETH_ALEN - 1
+			       ? ' ':':');// length: 31
+		printk("MAC dest = ");
+		p = (skb->mac.ethernet)->h_dest;
+		for (i = 0; i < ETH_ALEN; i++,p++)
+			printk("%02x%c", *p,
+			       i == ETH_ALEN - 1
+			       ? ' ':':');// length: 29
+	}
+	// length: 14
+	printk("proto = 0x%04x", ntohs(((*skb).mac.ethernet)->h_proto));
+
+	if ((loginfo->bitmask & EBT_LOG_IP) && skb->mac.ethernet->h_proto ==
+	   htons(ETH_P_IP)){
+		struct iphdr *iph = skb->nh.iph;
+		// max length: 46
+		printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u,",
+		   NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
+		// max length: 26
+		printk(" IP tos=0x%02X, IP proto=%d", iph->tos, iph->protocol);
+	}
+
+	if ((loginfo->bitmask & EBT_LOG_ARP) &&
+	    ((skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) ||
+	    (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_RARP)))) {
+		struct arphdr * arph = skb->nh.arph;
+		// max length: 40
+		printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
+		   ntohs(arph->ar_hrd), ntohs(arph->ar_pro),
+		   ntohs(arph->ar_op));
+	}
+	printk("\n");
+	spin_unlock_bh(&ebt_log_lock);
+}
+
+struct ebt_watcher log =
+{
+	{NULL, NULL}, EBT_LOG_WATCHER, ebt_log, ebt_log_check, NULL,
+	THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ebt_register_watcher(&log);
+}
+
+static void __exit fini(void)
+{
+	ebt_unregister_watcher(&log);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebt_snat.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,64 @@
+/*
+ *  ebt_snat
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
+ *  June, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_nat.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/skbuff.h>
+#include <linux/module.h>
+#include <net/sock.h>
+
+static int ebt_target_snat(struct sk_buff **pskb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_nat_info *infostuff = (struct ebt_nat_info *) data;
+
+	memcpy(((**pskb).mac.ethernet)->h_source, infostuff->mac,
+	   ETH_ALEN * sizeof(unsigned char));
+	return infostuff->target;
+}
+
+static int ebt_target_snat_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_nat_info *infostuff = (struct ebt_nat_info *) data;
+
+	if (strcmp(tablename, "nat"))
+		return -EINVAL;
+	if (datalen != sizeof(struct ebt_nat_info))
+		return -EINVAL;
+	if (hookmask & ~(1 << NF_BR_POST_ROUTING))
+		return -EINVAL;
+	if (infostuff->target < -NUM_STANDARD_TARGETS || infostuff->target >= 0)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_target snat =
+{
+	{NULL, NULL}, EBT_SNAT_TARGET, ebt_target_snat, ebt_target_snat_check,
+	NULL, THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ebt_register_target(&snat);
+}
+
+static void __exit fini(void)
+{
+	ebt_unregister_target(&snat);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebt_dnat.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,64 @@
+/*
+ *  ebt_dnat
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
+ *  June, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_nat.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/skbuff.h>
+#include <linux/module.h>
+#include <net/sock.h>
+
+static int ebt_target_dnat(struct sk_buff **pskb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_nat_info *infostuff = (struct ebt_nat_info *) data;
+
+	memcpy(((**pskb).mac.ethernet)->h_dest, infostuff->mac,
+	   ETH_ALEN * sizeof(unsigned char));
+	return infostuff->target;
+}
+
+static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_nat_info *infostuff = (struct ebt_nat_info *) data;
+
+	if ( (strcmp(tablename, "nat") ||
+	   (hookmask & ~((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT)))) &&
+	   (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
+		return -EINVAL;
+	if (datalen != sizeof(struct ebt_nat_info))
+		return -EINVAL;
+	if (infostuff->target < -NUM_STANDARD_TARGETS || infostuff->target >= 0)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_target dnat =
+{
+	{NULL, NULL}, EBT_DNAT_TARGET, ebt_target_dnat, ebt_target_dnat_check,
+	NULL, THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ebt_register_target(&dnat);
+}
+
+static void __exit fini(void)
+{
+	ebt_unregister_target(&dnat);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/net/bridge/netfilter/ebtables.c	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,1453 @@
+/*
+ *  ebtables
+ *
+ *  Author:
+ *  Bart De Schuymer		<bart.de.schuymer@pandora.be>
+ *
+ *  ebtables.c,v 2.0, April, 2002
+ *
+ *  This code is stongly inspired on the iptables code which is
+ *  Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ *
+ *  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.
+ */
+
+// used for print_string
+#include <linux/sched.h>
+#include <linux/tty.h>
+
+#include <linux/kmod.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/skbuff.h>
+#include <linux/if_ether.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/spinlock.h>
+#include <asm/uaccess.h>
+#include <linux/smp.h>
+#include <net/sock.h>
+// needed for logical [in,out]-dev filtering
+#include "../br_private.h"
+
+// list_named_find
+#define ASSERT_READ_LOCK(x)
+#define ASSERT_WRITE_LOCK(x)
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#if 0 // use this for remote debugging
+#define BUGPRINT(args) print_string(args);
+#else
+#define BUGPRINT(format, args...) printk("kernel msg: ebtables bug: please "\
+                                         "report to author: "format, ## args)
+// #define BUGPRINT(format, args...)
+#endif
+#define MEMPRINT(format, args...) printk("kernel msg: ebtables "\
+                                         ": out of memory: "format, ## args)
+// #define MEMPRINT(format, args...)
+
+static void print_string(char *str);
+
+static DECLARE_MUTEX(ebt_mutex);
+static LIST_HEAD(ebt_tables);
+static LIST_HEAD(ebt_targets);
+static LIST_HEAD(ebt_matches);
+static LIST_HEAD(ebt_watchers);
+
+static struct ebt_target ebt_standard_target =
+{ {NULL, NULL}, EBT_STANDARD_TARGET, NULL, NULL, NULL, NULL};
+
+static inline int ebt_do_watcher (struct ebt_entry_watcher *w,
+	    const struct sk_buff *skb,
+	    const struct net_device *in,
+	    const struct net_device *out,
+	    const struct ebt_counter *c)
+{
+	w->u.watcher->watcher(skb, in, out, w->data,
+	   w->watcher_size, c);
+	// watchers don't give a verdict
+	return 0;
+}
+
+static inline int ebt_do_match (struct ebt_entry_match *m,
+	    const struct sk_buff *skb,
+	    const struct net_device *in,
+	    const struct net_device *out,
+	    const struct ebt_counter *c)
+{
+	return m->u.match->match(skb, in, out, m->data,
+	   m->match_size, c);
+}
+
+static inline int ebt_dev_check(char *entry, const struct net_device *device)
+{
+	if (*entry == '\0')
+		return 0;
+	if (!device)
+		return 1;
+	return strncmp(entry, device->name, IFNAMSIZ);
+}
+
+// Do some firewalling
+unsigned int ebt_do_table (unsigned int hook, struct sk_buff **pskb,
+   const struct net_device *in, const struct net_device *out,
+   struct ebt_table *table)
+{
+	int i, j, nentries;
+	struct ebt_entry *point;
+	struct ebt_counter *counter_base;
+	struct ebt_entry_target *t;
+	int verdict, sp = 0;
+	struct ebt_chainstack *cs;
+	struct ebt_entries *chaininfo;
+	char *base;
+
+	read_lock_bh(&table->lock);
+	cs = table->private->chainstack;
+	chaininfo = table->private->hook_entry[hook];
+	nentries = table->private->hook_entry[hook]->nentries;
+	point = (struct ebt_entry *)(table->private->hook_entry[hook]->data);
+	#define cb_base table->private->counters + \
+	   cpu_number_map(smp_processor_id()) * table->private->nentries
+	counter_base = cb_base + table->private->hook_entry[hook]->counter_offset;
+	#define FWINV(bool,invflg) ((bool) ^ !!(point->invflags & invflg))
+	// base for chain jumps
+	base = (char *)chaininfo;
+	i = 0;
+ 	while (i < nentries) {
+		if ( ( point->bitmask & EBT_NOPROTO ||
+		   FWINV(point->ethproto == ((**pskb).mac.ethernet)->h_proto,
+		      EBT_IPROTO)
+		   || FWINV(ntohs(((**pskb).mac.ethernet)->h_proto) < 1536 &&
+		      (point->bitmask & EBT_802_3), EBT_IPROTO) )
+		   && FWINV(!ebt_dev_check((char *)(point->in), in), EBT_IIN)
+		   && FWINV(!ebt_dev_check((char *)(point->out), out), EBT_IOUT)
+		   && ((!in || !in->br_port) ? 1 : FWINV(!ebt_dev_check((char *)
+		      (point->logical_in), &in->br_port->br->dev), EBT_ILOGICALIN))
+		   && ((!out || !out->br_port) ? 1 :
+		       FWINV(!ebt_dev_check((char *)
+		      (point->logical_out), &out->br_port->br->dev), EBT_ILOGICALOUT))
+
+		) {
+			if (point->bitmask & EBT_SOURCEMAC) {
+				verdict = 0;
+				for (j = 0; j < 6; j++)
+					verdict |= (((**pskb).mac.ethernet)->
+					   h_source[j] ^ point->sourcemac[j]) &
+					   point->sourcemsk[j];
+				if (FWINV(!!verdict, EBT_ISOURCE) )
+					goto letscontinue;
+			}
+
+			if (point->bitmask & EBT_DESTMAC) {
+				verdict = 0;
+				for (j = 0; j < 6; j++)
+					verdict |= (((**pskb).mac.ethernet)->
+					   h_dest[j] ^ point->destmac[j]) &
+					   point->destmsk[j];
+				if (FWINV(!!verdict, EBT_IDEST) )
+					goto letscontinue;
+			}
+
+			if (EBT_MATCH_ITERATE(point, ebt_do_match, *pskb, in,
+			   out, counter_base + i) != 0)
+				goto letscontinue;
+
+			// increase counter
+			(*(counter_base + i)).pcnt++;
+
+			// these should only watch: not modify, nor tell us
+			// what to do with the packet
+			EBT_WATCHER_ITERATE(point, ebt_do_watcher, *pskb, in,
+			   out, counter_base + i);
+
+			t = (struct ebt_entry_target *)
+			   (((char *)point) + point->target_offset);
+			// standard target
+			if (!t->u.target->target)
+				verdict =
+				   ((struct ebt_standard_target *)t)->verdict;
+			else
+				verdict = t->u.target->target(pskb, hook,
+				   in, out, t->data, t->target_size);
+			if (verdict == EBT_ACCEPT) {
+				read_unlock_bh(&table->lock);
+				return NF_ACCEPT;
+			}
+			if (verdict == EBT_DROP) {
+				read_unlock_bh(&table->lock);
+				return NF_DROP;
+			}
+			if (verdict == EBT_RETURN) {
+letsreturn:
+				if (sp == 0)
+					// act like this is EBT_CONTINUE
+					goto letscontinue;
+				sp--;
+				// put all the local variables right
+				i = cs[sp].n;
+				chaininfo = cs[sp].chaininfo;
+				nentries = chaininfo->nentries;
+				point = cs[sp].e;
+				counter_base = cb_base +
+				   chaininfo->counter_offset;
+				continue;
+			}
+			if (verdict == EBT_CONTINUE)
+				goto letscontinue;
+			if (verdict < 0) {
+				BUGPRINT("bogus standard verdict\n");
+				read_unlock_bh(&table->lock);
+				return NF_DROP;
+			}
+			// jump to a udc
+			cs[sp].n = i + 1;
+			cs[sp].chaininfo = chaininfo;
+			cs[sp].e = (struct ebt_entry *)
+			   (((char *)point) + point->next_offset);
+			i = 0;
+			chaininfo = (struct ebt_entries *) (base + verdict);
+			if (chaininfo->distinguisher) {
+				BUGPRINT("jump to non-chain\n");
+				read_unlock_bh(&table->lock);
+				return NF_DROP;
+			}
+			nentries = chaininfo->nentries;
+			point = (struct ebt_entry *)chaininfo->data;
+			counter_base = cb_base + chaininfo->counter_offset;
+			sp++;
+			continue;
+		}
+letscontinue:
+		point = (struct ebt_entry *)
+		   (((char *)point) + point->next_offset);
+		i++;
+	}
+
+	// I actually like this :)
+	if (chaininfo->policy == EBT_RETURN)
+		goto letsreturn;
+	if (chaininfo->policy == EBT_ACCEPT) {
+		read_unlock_bh(&table->lock);
+		return NF_ACCEPT;
+	}
+	read_unlock_bh(&table->lock);
+	return NF_DROP;
+}
+
+/* If it succeeds, returns element and locks mutex */
+static inline void *
+find_inlist_lock_noload(struct list_head *head,
+			const char *name,
+			int *error,
+			struct semaphore *mutex)
+{
+	void *ret;
+
+	*error = down_interruptible(mutex);
+	if (*error != 0)
+		return NULL;
+
+	ret = list_named_find(head, name);
+	if (!ret) {
+		*error = -ENOENT;
+		up(mutex);
+	}
+	return ret;
+}
+
+#ifndef CONFIG_KMOD
+#define find_inlist_lock(h,n,p,e,m) find_inlist_lock_noload((h),(n),(e),(m))
+#else
+static void *
+find_inlist_lock(struct list_head *head,
+		 const char *name,
+		 const char *prefix,
+		 int *error,
+		 struct semaphore *mutex)
+{
+	void *ret;
+
+	ret = find_inlist_lock_noload(head, name, error, mutex);
+	if (!ret) {
+		char modulename[EBT_FUNCTION_MAXNAMELEN + strlen(prefix) + 1];
+		strcpy(modulename, prefix);
+		strcat(modulename, name);
+		request_module(modulename);
+		ret = find_inlist_lock_noload(head, name, error, mutex);
+	}
+
+	return ret;
+}
+#endif
+
+static inline struct ebt_table *
+find_table_lock(const char *name, int *error, struct semaphore *mutex)
+{
+	return find_inlist_lock(&ebt_tables, name, "ebtable_", error, mutex);
+}
+
+static inline struct ebt_match *
+find_match_lock(const char *name, int *error, struct semaphore *mutex)
+{
+	return find_inlist_lock(&ebt_matches, name, "ebt_", error, mutex);
+}
+
+static inline struct ebt_watcher *
+find_watcher_lock(const char *name, int *error, struct semaphore *mutex)
+{
+	return find_inlist_lock(&ebt_watchers, name, "ebt_", error, mutex);
+}
+
+static inline struct ebt_target *
+find_target_lock(const char *name, int *error, struct semaphore *mutex)
+{
+	return find_inlist_lock(&ebt_targets, name, "ebt_", error, mutex);
+}
+
+static inline int
+ebt_check_match(struct ebt_entry_match *m, struct ebt_entry *e,
+   const char *name, unsigned int hookmask, unsigned int *cnt)
+{
+	struct ebt_match *match;
+	int ret;
+
+	m->u.name[EBT_FUNCTION_MAXNAMELEN - 1] = '\0';
+	match = find_match_lock(m->u.name, &ret, &ebt_mutex);
+	if (!match) 
+		return ret;
+	m->u.match = match;
+	if (match->me)
+		__MOD_INC_USE_COUNT(match->me);
+	up(&ebt_mutex);
+	if (match->check &&
+	   match->check(name, hookmask, e, m->data, m->match_size) != 0) {
+		BUGPRINT("match->check failed\n");
+		if (match->me)
+			__MOD_DEC_USE_COUNT(match->me);
+		return -EINVAL;
+	}
+	(*cnt)++;
+	return 0;
+}
+
+static inline int
+ebt_check_watcher(struct ebt_entry_watcher *w, struct ebt_entry *e,
+   const char *name, unsigned int hookmask, unsigned int *cnt)
+{
+	struct ebt_watcher *watcher;
+	int ret;
+
+	w->u.name[EBT_FUNCTION_MAXNAMELEN - 1] = '\0';
+	watcher = find_watcher_lock(w->u.name, &ret, &ebt_mutex);
+	if (!watcher) 
+		return ret;
+	w->u.watcher = watcher;
+	if (watcher->me)
+		__MOD_INC_USE_COUNT(watcher->me);
+	up(&ebt_mutex);
+	if (watcher->check &&
+	   watcher->check(name, hookmask, e, w->data, w->watcher_size) != 0) {
+		BUGPRINT("watcher->check failed\n");
+		if (watcher->me)
+			__MOD_DEC_USE_COUNT(watcher->me);
+		return -EINVAL;
+	}
+	(*cnt)++;
+	return 0;
+}
+
+// this one is very careful, as it is the first function
+// to parse the userspace data
+static inline int
+ebt_check_entry_size_and_hooks(struct ebt_entry *e,
+   struct ebt_table_info *newinfo, char *base, char *limit,
+   struct ebt_entries **hook_entries, unsigned int *n, unsigned int *cnt,
+   unsigned int *totalcnt, unsigned int *udc_cnt, unsigned int valid_hooks)
+{
+	int i;
+
+	for (i = 0; i < NF_BR_NUMHOOKS; i++) {
+		if ((valid_hooks & (1 << i)) == 0)
+			continue;
+		if ( (char *)hook_entries[i] - base ==
+		   (char *)e - newinfo->entries)
+			break;
+	}
+	// beginning of a new chain
+	// if i == NF_BR_NUMHOOKS it must be a user defined chain
+	if (i != NF_BR_NUMHOOKS || !(e->bitmask & EBT_ENTRY_OR_ENTRIES)) {
+		if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) != 0) {
+			// we make userspace set this right,
+			// so there is no misunderstanding
+			BUGPRINT("EBT_ENTRY_OR_ENTRIES shouldn't be set "
+			         "in distinguisher\n");
+			return -EINVAL;
+		}
+		// this checks if the previous chain has as many entries
+		// as it said it has
+		if (*n != *cnt) {
+			BUGPRINT("nentries does not equal the nr of entries "
+		                 "in the chain\n");
+			return -EINVAL;
+		}
+		// before we look at the struct, be sure it is not too big
+		if ((char *)hook_entries[i] + sizeof(struct ebt_entries)
+		   > limit) {
+			BUGPRINT("entries_size too small\n");
+			return -EINVAL;
+		}
+		if (((struct ebt_entries *)e)->policy != EBT_DROP &&
+		   ((struct ebt_entries *)e)->policy != EBT_ACCEPT) {
+			// only RETURN from udc
+			if (i != NF_BR_NUMHOOKS ||
+			   ((struct ebt_entries *)e)->policy != EBT_RETURN) {
+				BUGPRINT("bad policy\n");
+				return -EINVAL;
+			}
+		}
+		if (i == NF_BR_NUMHOOKS) // it's a user defined chain
+			(*udc_cnt)++;
+		else
+			newinfo->hook_entry[i] = (struct ebt_entries *)e;
+		if (((struct ebt_entries *)e)->counter_offset != *totalcnt) {
+			BUGPRINT("counter_offset != totalcnt");
+			return -EINVAL;
+		}
+		*n = ((struct ebt_entries *)e)->nentries;
+		*cnt = 0;
+		return 0;
+	}
+	// a plain old entry, heh
+	if (sizeof(struct ebt_entry) > e->watchers_offset ||
+	   e->watchers_offset > e->target_offset ||
+	   e->target_offset > e->next_offset) {
+		BUGPRINT("entry offsets not in right order\n");
+		return -EINVAL;
+	}
+	// this is not checked anywhere else
+	if (e->next_offset - e->target_offset < sizeof(struct ebt_entry_target)) {
+		BUGPRINT("target size too small\n");
+		return -EINVAL;
+	}
+
+	(*cnt)++;
+	(*totalcnt)++;
+	return 0;
+}
+
+struct ebt_cl_stack
+{
+	struct ebt_chainstack cs;
+	int from;
+	unsigned int hookmask;
+};
+
+// we need these positions to check that the jumps to a different part of the
+// entries is a jump to the beginning of a new chain.
+static inline int
+ebt_get_udc_positions(struct ebt_entry *e, struct ebt_table_info *newinfo,
+   struct ebt_entries **hook_entries, unsigned int *n, unsigned int valid_hooks,
+   struct ebt_cl_stack *udc)
+{
+	int i;
+
+	// we're only interested in chain starts
+	if (e->bitmask & EBT_ENTRY_OR_ENTRIES)
+		return 0;
+	for (i = 0; i < NF_BR_NUMHOOKS; i++) {
+		if ((valid_hooks & (1 << i)) == 0)
+			continue;
+		if (newinfo->hook_entry[i] == (struct ebt_entries *)e)
+			break;
+	}
+	// only care about udc
+	if (i != NF_BR_NUMHOOKS)
+		return 0;
+
+	udc[*n].cs.chaininfo = (struct ebt_entries *)e;
+	// these initialisations are depended on later in check_chainloops()
+	udc[*n].cs.n = 0;
+	udc[*n].hookmask = 0;
+
+	(*n)++;
+	return 0;
+}
+
+static inline int
+ebt_cleanup_match(struct ebt_entry_match *m, unsigned int *i)
+{
+	if (i && (*i)-- == 0)
+		return 1;
+	if (m->u.match->destroy)
+		m->u.match->destroy(m->data, m->match_size);
+	if (m->u.match->me)
+		__MOD_DEC_USE_COUNT(m->u.match->me);
+
+	return 0;
+}
+
+static inline int
+ebt_cleanup_watcher(struct ebt_entry_watcher *w, unsigned int *i)
+{
+	if (i && (*i)-- == 0)
+		return 1;
+	if (w->u.watcher->destroy)
+		w->u.watcher->destroy(w->data, w->watcher_size);
+	if (w->u.watcher->me)
+		__MOD_DEC_USE_COUNT(w->u.watcher->me);
+
+	return 0;
+}
+
+static inline int
+ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
+   const char *name, unsigned int *cnt, unsigned int valid_hooks,
+   struct ebt_cl_stack *cl_s, unsigned int udc_cnt)
+{
+	struct ebt_entry_target *t;
+	struct ebt_target *target;
+	unsigned int i, j, hook = 0, hookmask = 0;
+	int ret;
+
+	// Don't mess with the struct ebt_entries
+	if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
+		return 0;
+
+	if (e->bitmask & ~EBT_F_MASK) {
+		BUGPRINT("Unknown flag for bitmask\n");
+		return -EINVAL;
+	}
+	if (e->invflags & ~EBT_INV_MASK) {
+		BUGPRINT("Unknown flag for inv bitmask\n");
+		return -EINVAL;
+	}
+	if ( (e->bitmask & EBT_NOPROTO) && (e->bitmask & EBT_802_3) ) {
+		BUGPRINT("NOPROTO & 802_3 not allowed\n");
+		return -EINVAL;
+	}
+	e->in[IFNAMSIZ - 1] = '\0';
+	e->out[IFNAMSIZ - 1] = '\0';
+	e->logical_in[IFNAMSIZ - 1] = '\0';
+	e->logical_out[IFNAMSIZ - 1] = '\0';
+	// what hook do we belong to?
+	for (i = 0; i < NF_BR_NUMHOOKS; i++) {
+		if ((valid_hooks & (1 << i)) == 0)
+			continue;
+		if ((char *)newinfo->hook_entry[i] < (char *)e)
+			hook = i;
+		else
+			break;
+	}
+	if (i < NF_BR_NUMHOOKS)
+		hookmask = (1 << hook);
+	else {
+		for (i = 0; i < udc_cnt; i++)
+			if ((char *)(cl_s[i].cs.chaininfo) > (char *)e)
+				break;
+		if (i == 0)
+			hookmask = (1 << hook);
+		else
+			hookmask = cl_s[i - 1].hookmask;
+	}
+	i = 0;
+	ret = EBT_MATCH_ITERATE(e, ebt_check_match, e, name, hookmask, &i);
+	if (ret != 0)
+		goto cleanup_matches;
+	j = 0;
+	ret = EBT_WATCHER_ITERATE(e, ebt_check_watcher, e, name, hookmask, &j);
+	if (ret != 0)
+		goto cleanup_watchers;
+	t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
+	t->u.name[EBT_FUNCTION_MAXNAMELEN - 1] = '\0';
+	target = find_target_lock(t->u.name, &ret, &ebt_mutex);
+	if (!target)
+		goto cleanup_watchers;
+	if (target->me)
+		__MOD_INC_USE_COUNT(target->me);
+	up(&ebt_mutex);
+
+	t->u.target = target;
+	if (t->u.target == &ebt_standard_target) {
+		if (e->target_offset + sizeof(struct ebt_standard_target) >
+		   e->next_offset) {
+			BUGPRINT("Standard target size too big\n");
+			ret = -EFAULT;
+			goto cleanup_watchers;
+		}
+		if (((struct ebt_standard_target *)t)->verdict <
+		   -NUM_STANDARD_TARGETS) {
+			BUGPRINT("Invalid standard target\n");
+			ret = -EFAULT;
+			goto cleanup_watchers;
+		}
+	} else if (t->u.target->check &&
+	   t->u.target->check(name, hookmask, e, t->data,
+	   t->target_size) != 0) {
+		if (t->u.target->me)
+			__MOD_DEC_USE_COUNT(t->u.target->me);
+		ret = -EFAULT;
+		goto cleanup_watchers;
+	}
+	(*cnt)++;
+	return 0;
+cleanup_watchers:
+	EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, &j);
+cleanup_matches:
+	EBT_MATCH_ITERATE(e, ebt_cleanup_match, &i);
+	return ret;
+}
+
+static inline int
+ebt_cleanup_entry(struct ebt_entry *e, unsigned int *cnt)
+{
+	struct ebt_entry_target *t;
+
+	if (e->bitmask == 0)
+		return 0;
+	// we're done
+	if (cnt && (*cnt)-- == 0)
+		return 1;
+	EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, NULL);
+	EBT_MATCH_ITERATE(e, ebt_cleanup_match, NULL);
+	t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
+	if (t->u.target->destroy)
+		t->u.target->destroy(t->data, t->target_size);
+	if (t->u.target->me)
+		__MOD_DEC_USE_COUNT(t->u.target->me);
+
+	return 0;
+}
+
+// checks for loops and sets the hook mask for udc
+// the hook mask for udc tells us from which base chains the udc can be
+// accessed. This mask is a parameter to the check() functions of the extensions
+int check_chainloops(struct ebt_entries *chain, struct ebt_cl_stack *cl_s,
+   unsigned int udc_cnt, unsigned int hooknr, char *base)
+{
+	int i, chain_nr = -1, pos = 0, nentries = chain->nentries, verdict;
+	struct ebt_entry *e = (struct ebt_entry *)chain->data;
+	struct ebt_entry_target *t;
+
+	while (pos < nentries || chain_nr != -1) {
+		// end of udc, go back one 'recursion' step
+		if (pos == nentries) {
+			// put back values of the time when this chain was called
+			e = cl_s[chain_nr].cs.e;
+			if (cl_s[chain_nr].from != -1)
+				nentries = cl_s[cl_s[chain_nr].from].cs.chaininfo->nentries;
+			else
+				nentries = chain->nentries;
+			pos = cl_s[chain_nr].cs.n;
+			// make sure we won't see a loop that isn't one
+			cl_s[chain_nr].cs.n = 0;
+			chain_nr = cl_s[chain_nr].from;
+			if (pos == nentries)
+				continue;
+		}
+		t = (struct ebt_entry_target *)
+		   (((char *)e) + e->target_offset);
+		t->u.name[EBT_FUNCTION_MAXNAMELEN - 1] = '\0';
+		if (strcmp(t->u.name, EBT_STANDARD_TARGET))
+			goto letscontinue;
+		if (e->target_offset + sizeof(struct ebt_standard_target) >
+		   e->next_offset) {
+			BUGPRINT("Standard target size too big\n");
+			return -1;
+		}
+		verdict = ((struct ebt_standard_target *)t)->verdict;
+		if (verdict >= 0) { // jump to another chain
+			struct ebt_entries *hlp2 =
+			   (struct ebt_entries *)(base + verdict);
+			for (i = 0; i < udc_cnt; i++)
+				if (hlp2 == cl_s[i].cs.chaininfo)
+					break;
+			// bad destination or loop
+			if (i == udc_cnt) {
+				BUGPRINT("bad destination\n");
+				return -1;
+			}
+			if (cl_s[i].cs.n) {
+				BUGPRINT("loop\n");
+				return -1;
+			}
+			cl_s[i].cs.n = pos + 1;
+			pos = 0;
+			cl_s[i].cs.e = ((void *)e + e->next_offset);
+			e = (struct ebt_entry *)(hlp2->data);
+			nentries = hlp2->nentries;
+			cl_s[i].from = chain_nr;
+			chain_nr = i;
+			// this udc is accessible from the base chain for hooknr
+			cl_s[i].hookmask |= (1 << hooknr);
+			continue;
+		}
+letscontinue:
+		e = (void *)e + e->next_offset;
+		pos++;
+	}
+	return 0;
+}
+
+// do the parsing of the table/chains/entries/matches/watchers/targets, heh
+static int translate_table(struct ebt_replace *repl,
+   struct ebt_table_info *newinfo)
+{
+	unsigned int i, j, k, udc_cnt;
+	int ret;
+	struct ebt_cl_stack *cl_s = NULL; // used in the checking for chain loops
+
+	i = 0;
+	while (i < NF_BR_NUMHOOKS && !(repl->valid_hooks & (1 << i)))
+		i++;
+	if (i == NF_BR_NUMHOOKS) {
+		BUGPRINT("No valid hooks specified\n");
+		return -EINVAL;
+	}
+	if (repl->hook_entry[i] != (struct ebt_entries *)repl->entries) {
+		BUGPRINT("Chains don't start at beginning\n");
+		return -EINVAL;
+	}
+	// make sure chains are ordered after each other in same order
+	// as their corresponding hooks
+	for (j = i + 1; j < NF_BR_NUMHOOKS; j++) {
+		if (!(repl->valid_hooks & (1 << j)))
+			continue;
+		if ( repl->hook_entry[j] <= repl->hook_entry[i] ) {
+			BUGPRINT("Hook order must be followed\n");
+			return -EINVAL;
+		}
+		i = j;
+	}
+
+	for (i = 0; i < NF_BR_NUMHOOKS; i++)
+		newinfo->hook_entry[i] = NULL;
+
+	newinfo->entries_size = repl->entries_size;
+	newinfo->nentries = repl->nentries;
+
+	// do some early checkings and initialize some things
+	i = 0; // holds the expected nr. of entries for the chain
+	j = 0; // holds the up to now counted entries for the chain
+	k = 0; // holds the total nr. of entries, should equal
+	       // newinfo->nentries afterwards
+	udc_cnt = 0; // will hold the nr. of user defined chains (udc)
+	ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
+	   ebt_check_entry_size_and_hooks, newinfo, repl->entries,
+	   repl->entries + repl->entries_size, repl->hook_entry, &i, &j, &k,
+	   &udc_cnt, repl->valid_hooks);
+
+	if (ret != 0)
+		return ret;
+
+	if (i != j) {
+		BUGPRINT("nentries does not equal the nr of entries in the "
+		         "(last) chain\n");
+		return -EINVAL;
+	}
+	if (k != newinfo->nentries) {
+		BUGPRINT("Total nentries is wrong\n");
+		return -EINVAL;
+	}
+
+	// check if all valid hooks have a chain
+	for (i = 0; i < NF_BR_NUMHOOKS; i++) {
+		if (newinfo->hook_entry[i] == NULL &&
+		   (repl->valid_hooks & (1 << i))) {
+			BUGPRINT("Valid hook without chain\n");
+			return -EINVAL;
+		}
+	}
+
+	// Get the location of the udc, put them in an array
+	// While we're at it, allocate the chainstack
+	if (udc_cnt) {
+		// this will get free'd in do_replace()/ebt_register_table()
+		// if an error occurs
+		newinfo->chainstack = (struct ebt_chainstack *)
+		   vmalloc(udc_cnt * sizeof(struct ebt_chainstack));
+		if (!newinfo->chainstack)
+			return -ENOMEM;
+		cl_s = (struct ebt_cl_stack *)
+		   vmalloc(udc_cnt * sizeof(struct ebt_cl_stack));
+		if (!cl_s)
+			return -ENOMEM;
+		i = 0; // the i'th udc
+		EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
+		   ebt_get_udc_positions, newinfo, repl->hook_entry, &i,
+		   repl->valid_hooks, cl_s);
+		// sanity check
+		if (i != udc_cnt) {
+			BUGPRINT("i != udc_cnt\n");
+			vfree(cl_s);
+			return -EFAULT;
+		}
+	}
+
+	// Check for loops
+	for (i = 0; i < NF_BR_NUMHOOKS; i++)
+		if (repl->valid_hooks & (1 << i))
+			if (check_chainloops(newinfo->hook_entry[i],
+			   cl_s, udc_cnt, i, newinfo->entries)) {
+				if (cl_s)
+					vfree(cl_s);
+				return -EINVAL;
+			}
+
+	// we now know the following (along with E=mc):
+	// - the nr of entries in each chain is right
+	// - the size of the allocated space is right
+	// - all valid hooks have a corresponding chain
+	// - there are no loops
+	// - wrong data can still be on the level of a single entry
+	// - could be there are jumps to places that are not the
+	//   beginning of a chain. This can only occur in chains that
+	//   are not accessible from any base chains, so we don't care.
+
+	// we just don't trust anything
+	repl->name[EBT_TABLE_MAXNAMELEN - 1] = '\0';
+	// used to know what we need to clean up if something goes wrong
+	i = 0;
+	ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
+	   ebt_check_entry, newinfo, repl->name, &i, repl->valid_hooks,
+	   cl_s, udc_cnt);
+	if (ret != 0) {
+		EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
+		   ebt_cleanup_entry, &i);
+	}
+	if (cl_s)
+		vfree(cl_s);
+	return ret;
+}
+
+// called under write_lock
+static inline void get_counters(struct ebt_table_info *info,
+   struct ebt_counter *counters)
+{
+	int i, cpu, counter_base;
+
+	// counters of cpu 0
+	memcpy(counters, info->counters,
+	   sizeof(struct ebt_counter) * info->nentries);
+	// add other counters to those of cpu 0
+	for (cpu = 1; cpu < smp_num_cpus; cpu++) {
+		counter_base = cpu * info->nentries;
+		for (i = 0; i < info->nentries; i++)
+			counters[i].pcnt +=
+			   info->counters[counter_base + i].pcnt;
+	}
+}
+
+// replace the table
+static int do_replace(void *user, unsigned int len)
+{
+	int ret;
+	struct ebt_table_info *newinfo;
+	struct ebt_replace tmp;
+	struct ebt_table *t;
+	struct ebt_counter *counterstmp = NULL;
+	// used to be able to unlock earlier
+	struct ebt_table_info *table;
+
+ 	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+		return -EFAULT;
+
+	if (len != sizeof(tmp) + tmp.entries_size) {
+		BUGPRINT("Wrong len argument\n");
+		return -EINVAL;
+	}
+
+	if (tmp.entries_size == 0) {
+		BUGPRINT("Entries_size never zero\n");
+		return -EINVAL;
+	}
+	newinfo = (struct ebt_table_info *)
+	   vmalloc(sizeof(struct ebt_table_info));
+	if (!newinfo)
+		return -ENOMEM;
+
+	if (tmp.nentries) {
+		newinfo->counters = (struct ebt_counter *)vmalloc(
+		   sizeof(struct ebt_counter) * tmp.nentries * smp_num_cpus);
+		if (!newinfo->counters) {
+			ret = -ENOMEM;
+			goto free_newinfo;
+		}
+		memset(newinfo->counters, 0,
+		   sizeof(struct ebt_counter) * tmp.nentries * smp_num_cpus);
+	}
+	else
+		newinfo->counters = NULL;
+
+	newinfo->entries = (char *)vmalloc(tmp.entries_size);
+	if (!newinfo->entries) {
+		ret = -ENOMEM;
+		goto free_counters;
+	}
+	if (copy_from_user(
+	   newinfo->entries, tmp.entries, tmp.entries_size) != 0) {
+		BUGPRINT("Couldn't copy entries from userspace\n");
+		ret = -EFAULT;
+		goto free_entries;
+	}
+
+	// the user wants counters back
+	// the check on the size is done later, when we have the lock
+	if (tmp.num_counters) {
+		counterstmp = (struct ebt_counter *)
+		   vmalloc(tmp.num_counters * sizeof(struct ebt_counter));
+		if (!counterstmp) {
+			ret = -ENOMEM;
+			goto free_entries;
+		}
+	}
+	else
+		counterstmp = NULL;
+
+	// this can get initialized by translate_table()
+	newinfo->chainstack = NULL;
+	ret = translate_table(&tmp, newinfo);
+
+	if (ret != 0)
+		goto free_counterstmp;
+
+	t = find_table_lock(tmp.name, &ret, &ebt_mutex);
+	if (!t)
+		goto free_unlock;
+
+	// the table doesn't like it
+	if (t->check && (ret = t->check(newinfo, tmp.valid_hooks)))
+		goto free_unlock;
+		
+	if (tmp.num_counters && tmp.num_counters != t->private->nentries) {
+		BUGPRINT("Wrong nr. of counters requested\n");
+		ret = -EINVAL;
+		goto free_unlock;
+	}
+
+	// we have the mutex lock, so no danger in reading this pointer
+	table = t->private;
+	// we need an atomic snapshot of the counters
+	write_lock_bh(&t->lock);
+	if (tmp.num_counters)
+		get_counters(t->private, counterstmp);
+
+	t->private = newinfo;
+	write_unlock_bh(&t->lock);
+	up(&ebt_mutex);
+	// So, a user can change the chains while having messed up his counter
+	// allocation. Only reason why I do this is because this way the lock
+	// is held only once, while this doesn't bring the kernel into a
+	// dangerous state.
+	if (tmp.num_counters &&
+	   copy_to_user(tmp.counters, counterstmp,
+	   tmp.num_counters * sizeof(struct ebt_counter))) {
+		BUGPRINT("Couldn't copy counters to userspace\n");
+		ret = -EFAULT;
+	}
+	else
+		ret = 0;
+
+	// decrease module count and free resources
+	EBT_ENTRY_ITERATE(table->entries, table->entries_size,
+	   ebt_cleanup_entry, NULL);
+
+	vfree(table->entries);
+	if (table->counters)
+		vfree(table->counters);
+	if (table->chainstack)
+		vfree(table->chainstack);
+	vfree(table);
+
+	if (counterstmp)
+		vfree(counterstmp);
+	return ret;
+
+free_unlock:
+	up(&ebt_mutex);
+	EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
+	   ebt_cleanup_entry, NULL);
+free_counterstmp:
+	if (counterstmp)
+		vfree(counterstmp);
+	// can be initialized in translate_table()
+	if (newinfo->chainstack)
+		vfree(newinfo->chainstack);
+free_entries:
+	if (newinfo->entries)
+		vfree(newinfo->entries);
+free_counters:
+	if (newinfo->counters)
+		vfree(newinfo->counters);
+free_newinfo:
+	if (newinfo)
+		vfree(newinfo);
+	return ret;
+}
+
+int ebt_register_target(struct ebt_target *target)
+{
+	int ret;
+
+	ret = down_interruptible(&ebt_mutex);
+	if (ret != 0)
+		return ret;
+	if (!list_named_insert(&ebt_targets, target)) {
+		up(&ebt_mutex);
+		return -EEXIST;
+	}
+	up(&ebt_mutex);
+	MOD_INC_USE_COUNT;
+
+	return 0;
+}
+
+void ebt_unregister_target(struct ebt_target *target)
+{
+	down(&ebt_mutex);
+	LIST_DELETE(&ebt_targets, target);
+	up(&ebt_mutex);
+	MOD_DEC_USE_COUNT;
+}
+
+int ebt_register_match(struct ebt_match *match)
+{
+	int ret;
+
+	ret = down_interruptible(&ebt_mutex);
+	if (ret != 0)
+		return ret;
+	if (!list_named_insert(&ebt_matches, match)) {
+		up(&ebt_mutex);
+		return -EEXIST;
+	}
+	up(&ebt_mutex);
+	MOD_INC_USE_COUNT;
+
+	return 0;
+}
+
+void ebt_unregister_match(struct ebt_match *match)
+{
+	down(&ebt_mutex);
+	LIST_DELETE(&ebt_matches, match);
+	up(&ebt_mutex);
+	MOD_DEC_USE_COUNT;
+}
+
+int ebt_register_watcher(struct ebt_watcher *watcher)
+{
+	int ret;
+
+	ret = down_interruptible(&ebt_mutex);
+	if (ret != 0)
+		return ret;
+	if (!list_named_insert(&ebt_watchers, watcher)) {
+		up(&ebt_mutex);
+		return -EEXIST;
+	}
+	up(&ebt_mutex);
+	MOD_INC_USE_COUNT;
+
+	return 0;
+}
+
+void ebt_unregister_watcher(struct ebt_watcher *watcher)
+{
+	down(&ebt_mutex);
+	LIST_DELETE(&ebt_watchers, watcher);
+	up(&ebt_mutex);
+	MOD_DEC_USE_COUNT;
+}
+
+int ebt_register_table(struct ebt_table *table)
+{
+	struct ebt_table_info *newinfo;
+	int ret;
+
+	if (!table || !table->table ||!table->table->entries ||
+	    table->table->entries_size == 0 ||
+	    table->table->counters || table->private) {
+		BUGPRINT("Bad table data for ebt_register_table!!!\n");
+		return -EINVAL;
+	}
+
+	newinfo = (struct ebt_table_info *)
+	   vmalloc(sizeof(struct ebt_table_info));
+	ret = -ENOMEM;
+	if (!newinfo)
+		return -ENOMEM;
+
+	newinfo->entries = (char *)vmalloc(table->table->entries_size);
+	if (!(newinfo->entries))
+		goto free_newinfo;
+
+	memcpy(newinfo->entries, table->table->entries,
+	   table->table->entries_size);
+
+	if (table->table->nentries) {
+		newinfo->counters = (struct ebt_counter *)
+		   vmalloc(table->table->nentries *
+		   sizeof(struct ebt_counter) * smp_num_cpus);
+		if (!newinfo->counters)
+			goto free_entries;
+		memset(newinfo->counters, 0, table->table->nentries *
+		   sizeof(struct ebt_counter) * smp_num_cpus);
+	}
+	else
+		newinfo->counters = NULL;
+
+	// fill in newinfo and parse the entries
+	newinfo->chainstack = NULL;
+	ret = translate_table(table->table, newinfo);
+	if (ret != 0) {
+		BUGPRINT("Translate_table failed\n");
+		goto free_counters;
+	}
+
+	if (table->check && table->check(newinfo, table->valid_hooks)) {
+		BUGPRINT("The table doesn't like its own initial data, lol\n");
+		return -EINVAL;
+	}
+
+	table->private = newinfo;
+	table->lock = RW_LOCK_UNLOCKED;
+	ret = down_interruptible(&ebt_mutex);
+	if (ret != 0)
+		goto free_counters;
+
+	if (list_named_find(&ebt_tables, table->name)) {
+		ret = -EEXIST;
+		BUGPRINT("Table name already exists\n");
+		goto free_unlock;
+	}
+
+	list_prepend(&ebt_tables, table);
+	up(&ebt_mutex);
+	MOD_INC_USE_COUNT;
+	return 0;
+free_unlock:
+	up(&ebt_mutex);
+free_counters:
+	if (newinfo->counters)
+		vfree(newinfo->counters);
+	if (newinfo->chainstack)
+		vfree(newinfo->chainstack);
+free_entries:
+	vfree(newinfo->entries);
+free_newinfo:
+	vfree(newinfo);
+	return ret;
+}
+
+void ebt_unregister_table(struct ebt_table *table)
+{
+	if (!table) {
+		BUGPRINT("Request to unregister NULL table!!!\n");
+		return;
+	}
+	down(&ebt_mutex);
+	LIST_DELETE(&ebt_tables, table);
+	up(&ebt_mutex);
+	EBT_ENTRY_ITERATE(table->private->entries,
+	   table->private->entries_size, ebt_cleanup_entry, NULL);
+	if (table->private->counters)
+		vfree(table->private->counters);
+	if (table->private->entries)
+		vfree(table->private->entries);
+	if (table->private->chainstack)
+		vfree(table->private->chainstack);
+	vfree(table->private);
+	MOD_DEC_USE_COUNT;
+}
+
+// userspace just supplied us with counters
+static int update_counters(void *user, unsigned int len)
+{
+	int i, ret;
+	struct ebt_counter *tmp;
+	struct ebt_replace hlp;
+	struct ebt_table *t;
+
+	if (copy_from_user(&hlp, user, sizeof(hlp)))
+		return -EFAULT;
+
+	if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))
+		return -EINVAL;
+	if (hlp.num_counters == 0)
+		return -EINVAL;
+
+	if ( !(tmp = (struct ebt_counter *)
+	   vmalloc(hlp.num_counters * sizeof(struct ebt_counter))) ){
+		MEMPRINT("Updata_counters && nomemory\n");
+		return -ENOMEM;
+	}
+
+	hlp.name[EBT_TABLE_MAXNAMELEN - 1] = '\0';
+
+	t = find_table_lock(hlp.name, &ret, &ebt_mutex);
+	if (!t)
+		goto free_tmp;
+
+	if (hlp.num_counters != t->private->nentries) {
+		BUGPRINT("Wrong nr of counters\n");
+		ret = -EINVAL;
+		goto unlock_mutex;
+	}
+
+	if ( copy_from_user(tmp, hlp.counters,
+	   hlp.num_counters * sizeof(struct ebt_counter)) ) {
+		BUGPRINT("Updata_counters && !cfu\n");
+		ret = -EFAULT;
+		goto unlock_mutex;
+	}
+
+	// we want an atomic add of the counters
+	write_lock_bh(&t->lock);
+
+	// we add to the counters of the first cpu
+	for (i = 0; i < hlp.num_counters; i++)
+		t->private->counters[i].pcnt += tmp[i].pcnt;
+
+	write_unlock_bh(&t->lock);
+	ret = 0;
+unlock_mutex:
+	up(&ebt_mutex);
+free_tmp:
+	vfree(tmp);
+	return ret;
+}
+
+static inline int ebt_make_matchname(struct ebt_entry_match *m,
+   char *base, char *ubase)
+{
+	char *hlp = ubase - base + (char *)m;
+	if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN))
+		return -EFAULT;
+	return 0;
+}
+
+static inline int ebt_make_watchername(struct ebt_entry_watcher *w,
+   char *base, char *ubase)
+{
+	char *hlp = ubase - base + (char *)w;
+	if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN))
+		return -EFAULT;
+	return 0;
+}
+
+static inline int ebt_make_names(struct ebt_entry *e, char *base, char *ubase)
+{
+	int ret;
+	char *hlp = ubase - base + (char *)e + e->target_offset;
+	struct ebt_entry_target *t;
+
+	if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
+		return 0;
+
+	t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
+	
+	ret = EBT_MATCH_ITERATE(e, ebt_make_matchname, base, ubase);
+	if (ret != 0)
+		return ret;
+	ret = EBT_WATCHER_ITERATE(e, ebt_make_watchername, base, ubase);
+	if (ret != 0)
+		return ret;
+	if (copy_to_user(hlp, t->u.target->name, EBT_FUNCTION_MAXNAMELEN))
+		return -EFAULT;
+	return 0;
+}
+
+// called with ebt_mutex down
+static int copy_everything_to_user(struct ebt_table *t, void *user, int *len)
+{
+	struct ebt_replace tmp;
+	struct ebt_table_info *info = t->private;
+	struct ebt_counter *counterstmp;
+	int i;
+
+	if (copy_from_user(&tmp, user, sizeof(tmp))) {
+		BUGPRINT("Cfu didn't work\n");
+		return -EFAULT;
+	}
+
+	if (*len != sizeof(struct ebt_replace) + info->entries_size +
+	   (tmp.num_counters? info->nentries * sizeof(struct ebt_counter): 0)) {
+		BUGPRINT("Wrong size\n");
+		return -EINVAL;
+	}
+
+	if (tmp.nentries != info->nentries) {
+		BUGPRINT("Nentries wrong\n");
+		return -EINVAL;
+	}
+
+	if (tmp.entries_size != info->entries_size) {
+		BUGPRINT("Wrong size\n");
+		return -EINVAL;
+	}
+
+	// userspace might not need the counters
+	if (tmp.num_counters) {
+		if (tmp.num_counters != info->nentries) {
+			BUGPRINT("Num_counters wrong\n");
+			return -EINVAL;
+		}
+		counterstmp = (struct ebt_counter *)
+		   vmalloc(info->nentries * sizeof(struct ebt_counter));
+		if (!counterstmp) {
+			BUGPRINT("Couldn't copy counters, out of memory\n");
+			return -ENOMEM;
+		}
+		write_lock_bh(&t->lock);
+		get_counters(info, counterstmp);
+		write_unlock_bh(&t->lock);
+
+		if (copy_to_user(tmp.counters, counterstmp,
+		   info->nentries * sizeof(struct ebt_counter))) {
+			BUGPRINT("Couldn't copy counters to userspace\n");
+			vfree(counterstmp);
+			return -EFAULT;
+		}
+		vfree(counterstmp);
+	}
+
+	if (copy_to_user(tmp.entries, info->entries, info->entries_size)) {
+		BUGPRINT("Couldn't copy entries to userspace\n");
+		return -EFAULT;
+	}
+	// make userspace's life easier
+	memcpy(tmp.hook_entry, info->hook_entry,
+	   NF_BR_NUMHOOKS * sizeof(struct ebt_entries *));
+	for (i = 0; i < NF_BR_NUMHOOKS; i++)
+		tmp.hook_entry[i] = (struct ebt_entries *)(((char *)
+		   (info->hook_entry[i])) - info->entries + tmp.entries);
+	if (copy_to_user(user, &tmp, sizeof(struct ebt_replace))) {
+		BUGPRINT("Couldn't copy ebt_replace to userspace\n");
+		return -EFAULT;
+	}
+	// set the match/watcher/target names right
+	return EBT_ENTRY_ITERATE(info->entries, info->entries_size,
+	   ebt_make_names, info->entries, tmp.entries);
+}
+
+static int do_ebt_set_ctl(struct sock *sk,
+	int cmd, void *user, unsigned int len)
+{
+	int ret;
+
+	switch(cmd) {
+	case EBT_SO_SET_ENTRIES:
+		ret = do_replace(user, len);
+		break;
+	case EBT_SO_SET_COUNTERS:
+		ret = update_counters(user, len);
+		break;
+	default:
+		ret = -EINVAL;
+  }
+	return ret;
+}
+
+static int do_ebt_get_ctl(struct sock *sk, int cmd, void *user, int *len)
+{
+	int ret;
+	struct ebt_replace tmp;
+	struct ebt_table *t;
+
+	if (copy_from_user(&tmp, user, sizeof(tmp)))
+		return -EFAULT;
+
+	t = find_table_lock(tmp.name, &ret, &ebt_mutex);
+	if (!t)
+		return ret;
+
+	switch(cmd) {
+	case EBT_SO_GET_INFO:
+		if (*len != sizeof(struct ebt_replace)){
+			ret = -EINVAL;
+			up(&ebt_mutex);
+			break;
+		}
+		tmp.nentries = t->private->nentries;
+		tmp.entries_size = t->private->entries_size;
+		// userspace needs this to check the chain names
+		tmp.valid_hooks = t->valid_hooks;
+		up(&ebt_mutex);
+		if (copy_to_user(user, &tmp, *len) != 0){
+			BUGPRINT("c2u Didn't work\n");
+			ret = -EFAULT;
+			break;
+		}
+		ret = 0;
+		break;
+
+	case EBT_SO_GET_ENTRIES:
+		ret = copy_everything_to_user(t, user, len);
+		up(&ebt_mutex);
+		break;			
+
+	default:
+		up(&ebt_mutex);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static struct nf_sockopt_ops ebt_sockopts =
+{ { NULL, NULL }, PF_INET, EBT_BASE_CTL, EBT_SO_SET_MAX + 1, do_ebt_set_ctl,
+    EBT_BASE_CTL, EBT_SO_GET_MAX + 1, do_ebt_get_ctl, 0, NULL
+};
+
+// Copyright (C) 1998 by Ori Pomerantz
+// Print the string to the appropriate tty, the one
+// the current task uses
+static void print_string(char *str)
+{
+	struct tty_struct *my_tty;
+
+	/* The tty for the current task */
+	my_tty = current->tty;
+	if (my_tty != NULL) {
+		(*(my_tty->driver).write)(my_tty, 0, str, strlen(str));  
+		(*(my_tty->driver).write)(my_tty, 0, "\015\012", 2);
+	}
+}
+
+static int __init init(void)
+{
+	int ret;
+
+	down(&ebt_mutex);
+	list_named_insert(&ebt_targets, &ebt_standard_target);
+	up(&ebt_mutex);
+	if ((ret = nf_register_sockopt(&ebt_sockopts)) < 0)
+		return ret;
+
+	print_string("Ebtables v2.0 registered");
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	nf_unregister_sockopt(&ebt_sockopts);
+	print_string("Ebtables v2.0 unregistered");
+}
+
+EXPORT_SYMBOL(ebt_register_table);
+EXPORT_SYMBOL(ebt_unregister_table);
+EXPORT_SYMBOL(ebt_register_match);
+EXPORT_SYMBOL(ebt_unregister_match);
+EXPORT_SYMBOL(ebt_register_watcher);
+EXPORT_SYMBOL(ebt_unregister_watcher);
+EXPORT_SYMBOL(ebt_register_target);
+EXPORT_SYMBOL(ebt_unregister_target);
+EXPORT_SYMBOL(ebt_do_table);
+module_init(init);
+module_exit(fini);
+MODULE_LICENSE("GPL");
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/include/linux/netfilter_bridge/ebtables.h	Thu Jun 27 20:18:07 2002
@@ -0,0 +1,345 @@
+/*
+ *  ebtables
+ *
+ *	Authors:
+ *	Bart De Schuymer		<bart.de.schuymer@pandora.be>
+ *
+ *  ebtables.c,v 2.0, April, 2002
+ *
+ *  This code is stongly inspired on the iptables code which is
+ *  Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ */
+
+#ifndef __LINUX_BRIDGE_EFF_H
+#define __LINUX_BRIDGE_EFF_H
+#include <linux/if.h> // IFNAMSIZ
+#include <linux/netfilter_bridge.h>
+#include <linux/if_ether.h> // ETH_ALEN
+
+#define EBT_TABLE_MAXNAMELEN 32
+#define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN
+#define EBT_FUNCTION_MAXNAMELEN EBT_TABLE_MAXNAMELEN
+
+// [gs]etsockopt numbers
+#define EBT_BASE_CTL            128
+
+#define EBT_SO_SET_ENTRIES      (EBT_BASE_CTL)
+#define EBT_SO_SET_COUNTERS     (EBT_SO_SET_ENTRIES+1)
+#define EBT_SO_SET_MAX          (EBT_SO_SET_COUNTERS+1)
+
+#define EBT_SO_GET_INFO         (EBT_BASE_CTL)
+#define EBT_SO_GET_ENTRIES      (EBT_SO_GET_INFO+1)
+#define EBT_SO_GET_MAX          (EBT_SO_GET_ENTRIES+1)
+
+// verdicts >0 are "branches"
+#define EBT_ACCEPT   -1
+#define EBT_DROP     -2
+#define EBT_CONTINUE -3
+#define EBT_RETURN   -4
+#define NUM_STANDARD_TARGETS   4
+
+struct ebt_counter
+{
+	__u64 pcnt;
+};
+
+struct ebt_entries {
+	// this field is always set to zero (including userspace).
+	// See EBT_ENTRY_OR_ENTRIES.
+	// Must be same size as ebt_entry.bitmask
+	__u32 distinguisher;
+	// the chain name
+	char name[EBT_CHAIN_MAXNAMELEN];
+	// counter offset for this chain
+	unsigned int counter_offset;
+	// one standard (accept, drop, return) per hook
+	int policy;
+	// nr. of entries
+	__u32 nentries;
+	// entry list
+	__u8 data[0];
+};
+
+// used for the bitmask of struct ebt_entry
+
+// This is a hack to make a difference between an ebt_entry struct and an
+// ebt_entries struct when traversing the entries from start to end.
+// Using this simplifies the code alot, while still being able to use
+// ebt_entries.
+// Contrary, iptables doesn't use something like ebt_entries and therefore uses
+// different techniques for naming the policy and such. So, iptables doesn't
+// need a hack like this.
+#define EBT_ENTRY_OR_ENTRIES 0x01
+// these are the normal masks
+#define EBT_NOPROTO 0x02
+#define EBT_802_3 0x04
+#define EBT_SOURCEMAC 0x08
+#define EBT_DESTMAC 0x10
+#define EBT_F_MASK (EBT_NOPROTO | EBT_802_3 | EBT_SOURCEMAC | EBT_DESTMAC \
+   | EBT_ENTRY_OR_ENTRIES)
+
+#define EBT_IPROTO 0x01
+#define EBT_IIN 0x02
+#define EBT_IOUT 0x04
+#define EBT_ISOURCE 0x8
+#define EBT_IDEST 0x10
+#define EBT_ILOGICALIN 0x20
+#define EBT_ILOGICALOUT 0x40
+#define EBT_INV_MASK (EBT_IPROTO | EBT_IIN | EBT_IOUT | EBT_ILOGICALIN \
+   | EBT_ILOGICALOUT | EBT_ISOURCE | EBT_IDEST)
+
+struct ebt_entry_match
+{
+	union {
+		char name[EBT_FUNCTION_MAXNAMELEN];
+		struct ebt_match *match;
+	} u;
+	// size of data
+	unsigned int match_size;
+	unsigned char data[0];
+};
+
+struct ebt_entry_watcher
+{
+	union {
+		char name[EBT_FUNCTION_MAXNAMELEN];
+		struct ebt_watcher *watcher;
+	} u;
+	// size of data
+	unsigned int watcher_size;
+	unsigned char data[0];
+};
+
+struct ebt_entry_target
+{
+	union {
+		char name[EBT_FUNCTION_MAXNAMELEN];
+		struct ebt_target *target;
+	} u;
+	// size of data
+	unsigned int target_size;
+	unsigned char data[0];
+};
+
+#define EBT_STANDARD_TARGET "standard"
+struct ebt_standard_target
+{
+	struct ebt_entry_target target;
+	int verdict;
+};
+
+// one entry
+struct ebt_entry {
+	// this needs to be the first field
+	__u32 bitmask;
+	__u32 invflags;
+	__u16 ethproto;
+	// the physical in-dev
+	__u8 in[IFNAMSIZ];
+	// the logical in-dev
+	__u8 logical_in[IFNAMSIZ];
+	// the physical out-dev
+	__u8 out[IFNAMSIZ];
+	// the logical out-dev
+	__u8 logical_out[IFNAMSIZ];
+	__u8 sourcemac[ETH_ALEN];
+	__u8 sourcemsk[ETH_ALEN];
+	__u8 destmac[ETH_ALEN];
+	__u8 destmsk[ETH_ALEN];
+	// sizeof ebt_entry + matches
+	__u16 watchers_offset;
+	// sizeof ebt_entry + matches + watchers
+	__u16 target_offset;
+	// sizeof ebt_entry + matches + watchers + target
+	__u16 next_offset;
+	unsigned char elems[0];
+};
+
+struct ebt_replace
+{
+	char name[EBT_TABLE_MAXNAMELEN];
+	unsigned int valid_hooks;
+	// nr of rules in the table
+	unsigned int nentries;
+	// total size of the entries
+	unsigned int entries_size;
+	// start of the chains
+	struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
+	// nr of counters userspace expects back
+	unsigned int num_counters;
+	// where the kernel will put the old counters
+	struct ebt_counter *counters;
+	char *entries;
+};
+
+#ifdef __KERNEL__
+
+struct ebt_match
+{
+	struct list_head list;
+	const char name[EBT_FUNCTION_MAXNAMELEN];
+	// 0 == it matches
+	int (*match)(const struct sk_buff *skb, const struct net_device *in,
+	   const struct net_device *out, const void *matchdata,
+	   unsigned int datalen, const struct ebt_counter *c);
+	// 0 == let it in
+	int (*check)(const char *tablename, unsigned int hookmask,
+	   const struct ebt_entry *e, void *matchdata, unsigned int datalen);
+	void (*destroy)(void *matchdata, unsigned int datalen);
+	struct module *me;
+};
+
+struct ebt_watcher
+{
+	struct list_head list;
+	const char name[EBT_FUNCTION_MAXNAMELEN];
+	void (*watcher)(const struct sk_buff *skb, const struct net_device *in,
+	   const struct net_device *out, const void *watcherdata,
+	   unsigned int datalen, const struct ebt_counter *c);
+	// 0 == let it in
+	int (*check)(const char *tablename, unsigned int hookmask,
+	   const struct ebt_entry *e, void *watcherdata, unsigned int datalen);
+	void (*destroy)(void *watcherdata, unsigned int datalen);
+	struct module *me;
+};
+
+struct ebt_target
+{
+	struct list_head list;
+	const char name[EBT_FUNCTION_MAXNAMELEN];
+	// returns one of the standard verdicts
+	int (*target)(struct sk_buff **pskb,
+	       unsigned int hooknr,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const void *targetdata,
+	       unsigned int datalen);
+	// 0 == let it in
+	int (*check)(const char *tablename, unsigned int hookmask,
+	   const struct ebt_entry *e, void *targetdata, unsigned int datalen);
+	void (*destroy)(void *targetdata, unsigned int datalen);
+	struct module *me;
+};
+
+// used for jumping from and into user defined chains (udc)
+struct ebt_chainstack
+{
+	struct ebt_entries *chaininfo; // pointer to chain data
+	struct ebt_entry *e; // pointer to entry data
+	unsigned int n; // n'th entry
+};
+
+struct ebt_table_info
+{
+	// total size of the entries
+	unsigned int entries_size;
+	unsigned int nentries;
+	// pointers to the start of the chains
+	struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
+	struct ebt_counter *counters;
+	// room to maintain the stack used for jumping from and into udc
+	struct ebt_chainstack *chainstack;
+	char *entries;
+};
+
+struct ebt_table
+{
+	struct list_head list;
+	char name[EBT_TABLE_MAXNAMELEN];
+	struct ebt_replace *table;
+	unsigned int valid_hooks;
+	rwlock_t lock;
+	// e.g. could be the table explicitly only allows certain
+	// matches, targets, ... 0 == let it in
+	int (*check)(const struct ebt_table_info *info,
+	   unsigned int valid_hooks);
+	// the data used by the kernel
+	struct ebt_table_info *private;
+};
+
+extern int ebt_register_table(struct ebt_table *table);
+extern void ebt_unregister_table(struct ebt_table *table);
+extern int ebt_register_match(struct ebt_match *match);
+extern void ebt_unregister_match(struct ebt_match *match);
+extern int ebt_register_watcher(struct ebt_watcher *watcher);
+extern void ebt_unregister_watcher(struct ebt_watcher *watcher);
+extern int ebt_register_target(struct ebt_target *target);
+extern void ebt_unregister_target(struct ebt_target *target);
+extern unsigned int ebt_do_table(unsigned int hook, struct sk_buff **pskb,
+   const struct net_device *in, const struct net_device *out,
+   struct ebt_table *table);
+
+#endif /* __KERNEL__ */
+
+// blatently stolen from ip_tables.h
+// fn returns 0 to continue iteration
+#define EBT_MATCH_ITERATE(e, fn, args...)                   \
+({                                                          \
+	unsigned int __i;                                   \
+	int __ret = 0;                                      \
+	struct ebt_entry_match *__match;                    \
+	                                                    \
+	for (__i = sizeof(struct ebt_entry);                \
+	     __i < (e)->watchers_offset;                    \
+	     __i += __match->match_size +                   \
+	     sizeof(struct ebt_entry_match)) {              \
+		__match = (void *)(e) + __i;                \
+		                                            \
+		__ret = fn(__match , ## args);              \
+		if (__ret != 0)                             \
+			break;                              \
+	}                                                   \
+	if (__ret == 0) {                                   \
+		if (__i != (e)->watchers_offset)            \
+			__ret = -EINVAL;                    \
+	}                                                   \
+	__ret;                                              \
+})
+
+#define EBT_WATCHER_ITERATE(e, fn, args...)                 \
+({                                                          \
+	unsigned int __i;                                   \
+	int __ret = 0;                                      \
+	struct ebt_entry_watcher *__watcher;                \
+	                                                    \
+	for (__i = e->watchers_offset;                      \
+	     __i < (e)->target_offset;                      \
+	     __i += __watcher->watcher_size +               \
+	     sizeof(struct ebt_entry_watcher)) {            \
+		__watcher = (void *)(e) + __i;              \
+		                                            \
+		__ret = fn(__watcher , ## args);            \
+		if (__ret != 0)                             \
+			break;                              \
+	}                                                   \
+	if (__ret == 0) {                                   \
+		if (__i != (e)->target_offset)              \
+			__ret = -EINVAL;                    \
+	}                                                   \
+	__ret;                                              \
+})
+
+#define EBT_ENTRY_ITERATE(entries, size, fn, args...)       \
+({                                                          \
+	unsigned int __i;                                   \
+	int __ret = 0;                                      \
+	struct ebt_entry *__entry;                          \
+	                                                    \
+	for (__i = 0; __i < (size);) {                      \
+		__entry = (void *)(entries) + __i;          \
+		__ret = fn(__entry , ## args);              \
+		if (__ret != 0)                             \
+			break;                              \
+		if (__entry->bitmask != 0)                  \
+		 __i += __entry->next_offset;               \
+		else                                        \
+		 __i += sizeof(struct ebt_entries);         \
+	}                                                   \
+	if (__ret == 0) {                                   \
+		if (__i != (size))                          \
+			__ret = -EINVAL;                    \
+	}                                                   \
+	__ret;                                              \
+})
+
+#endif
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/include/linux/netfilter_bridge/ebt_arp.h	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,26 @@
+#ifndef __LINUX_BRIDGE_EBT_ARP_H
+#define __LINUX_BRIDGE_EBT_ARP_H
+
+#define EBT_ARP_OPCODE 0x01
+#define EBT_ARP_HTYPE 0x02
+#define EBT_ARP_PTYPE 0x04
+#define EBT_ARP_SRC_IP 0x08
+#define EBT_ARP_DST_IP 0x10
+#define EBT_ARP_MASK (EBT_ARP_OPCODE | EBT_ARP_HTYPE | EBT_ARP_PTYPE | \
+   EBT_ARP_SRC_IP | EBT_ARP_DST_IP)
+#define EBT_ARP_MATCH "arp"
+
+struct ebt_arp_info
+{
+	__u16 htype;
+	__u16 ptype;
+	__u16 opcode;
+	__u32 saddr;
+	__u32 smsk;
+	__u32 daddr;
+	__u32 dmsk;
+	__u8  bitmask;
+	__u8  invflags;
+};
+
+#endif
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/include/linux/netfilter_bridge/ebt_ip.h	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,24 @@
+#ifndef __LINUX_BRIDGE_EBT_IP_H
+#define __LINUX_BRIDGE_EBT_IP_H
+
+#define EBT_IP_SOURCE 0x01
+#define EBT_IP_DEST 0x02
+#define EBT_IP_TOS 0x04
+#define EBT_IP_PROTO 0x08
+#define EBT_IP_MASK (EBT_IP_SOURCE | EBT_IP_DEST | EBT_IP_TOS | EBT_IP_PROTO)
+#define EBT_IP_MATCH "ip"
+
+// the same values are used for the invflags
+struct ebt_ip_info
+{
+	__u32 saddr;
+	__u32 daddr;
+	__u32 smsk;
+	__u32 dmsk;
+	__u8  tos;
+	__u8  protocol;
+	__u8  bitmask;
+	__u8  invflags;
+};
+
+#endif
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/include/linux/netfilter_bridge/ebt_vlan.h	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,20 @@
+#ifndef __LINUX_BRIDGE_EBT_VLAN_H
+#define __LINUX_BRIDGE_EBT_VLAN_H
+
+#define EBT_VLAN_ID	0x01
+#define EBT_VLAN_PRIO	0x02
+#define EBT_VLAN_ENCAP	0x04
+#define EBT_VLAN_MASK (EBT_VLAN_ID | EBT_VLAN_PRIO | EBT_VLAN_ENCAP)
+#define EBT_VLAN_MATCH "vlan"
+
+struct ebt_vlan_info {
+	__u16 id;		/* VLAN ID {1-4095} */
+	__u8 prio;		/* VLAN User Priority {0-7} */
+	__u16 encap;		/* VLAN Encapsulated frame code {0-65535} */
+	__u8 bitmask;		/* Args bitmask bit 1=1 - ID arg, 
+				   bit 2=1 User-Priority arg, bit 3=1 encap*/
+	__u8 invflags;		/* Inverse bitmask  bit 1=1 - inversed ID arg, 
+				   bit 2=1 - inversed Pirority arg */
+};
+
+#endif
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/include/linux/netfilter_bridge/ebt_log.h	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,17 @@
+#ifndef __LINUX_BRIDGE_EBT_LOG_H
+#define __LINUX_BRIDGE_EBT_LOG_H
+
+#define EBT_LOG_IP 0x01 // if the frame is made by ip, log the ip information
+#define EBT_LOG_ARP 0x02
+#define EBT_LOG_MASK (EBT_LOG_IP | EBT_LOG_ARP)
+#define EBT_LOG_PREFIX_SIZE 30
+#define EBT_LOG_WATCHER "log"
+
+struct ebt_log_info
+{
+	__u8 loglevel;
+	__u8 prefix[EBT_LOG_PREFIX_SIZE];
+	__u32 bitmask;
+};
+
+#endif
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/include/linux/netfilter_bridge/ebt_nat.h	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,13 @@
+#ifndef __LINUX_BRIDGE_EBT_NAT_H
+#define __LINUX_BRIDGE_EBT_NAT_H
+
+struct ebt_nat_info
+{
+	unsigned char mac[ETH_ALEN];
+	// EBT_ACCEPT, EBT_DROP or EBT_CONTINUE or EBT_RETURN
+	int target;
+};
+#define EBT_SNAT_TARGET "snat"
+#define EBT_DNAT_TARGET "dnat"
+
+#endif
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/include/linux/netfilter_bridge/ebt_redirect.h	Thu Jun 27 19:11:50 2002
@@ -0,0 +1,11 @@
+#ifndef __LINUX_BRIDGE_EBT_REDIRECT_H
+#define __LINUX_BRIDGE_EBT_REDIRECT_H
+
+struct ebt_redirect_info
+{
+	// EBT_ACCEPT, EBT_DROP or EBT_CONTINUE or EBT_RETURN
+	int target;
+};
+#define EBT_REDIRECT_TARGET "redirect"
+
+#endif
--- /dev/null	Thu Aug 24 11:00:32 2000
+++ ebt2.0pre9/include/linux/br_db.h	Thu Jun 27 20:18:35 2002
@@ -0,0 +1,53 @@
+/*
+ *  bridge ethernet protocol filter
+ *
+ *	Authors:
+ *	Bart De Schuymer		<bart.de.schuymer@pandora.be>
+ *
+ *	br_db.h,v 1.1 2001/04/16
+ *
+ *  This code is stongly inspired on the iptables code which is
+ *  Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ *
+ *	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.
+ */
+
+#ifndef __LINUX_BRIDGE_DB_H
+#define __LINUX_BRIDGE_DB_H
+#include <linux/if.h> /* IFNAMSIZ */
+#ifdef __KERNEL__
+#include <linux/if_bridge.h>
+#include <linux/netfilter_bridge.h>
+#else
+#include <linux/netfilter_bridge.h>
+#endif
+#define BRDB_BASE_CTL            135
+
+#define BRDB_SO_SET_ALLOWDB      (BRDB_BASE_CTL)
+#define BRDB_SO_SET_MAX          (BRDB_SO_SET_ALLOWDB+1)
+
+#define BRDB_SO_GET_DBINFO       (BRDB_BASE_CTL)
+#define BRDB_SO_GET_DB           (BRDB_SO_GET_DBINFO+1)
+#define BRDB_SO_GET_MAX          (BRDB_SO_GET_DB+1)
+
+#define BRDB_NODB 0
+#define BRDB_DB   1
+
+#define INITIAL_DBSIZE 10
+#define IDENTIFY802_3 46
+
+struct brdb_dbinfo {
+	__u32 nentries;
+};
+
+struct brdb_dbentry {
+	__u8 in[IFNAMSIZ];
+	__u8 out[IFNAMSIZ];
+	__u16 ethproto;
+	__u32 hook;
+};
+
+#endif