import clean BK tree at cset 1.3670

1 files changed, 5557 insertions, 0 deletions

diff --git a/packages/linux/linux-wrt-2.4.20/140-ebtables-brnf-5.patch b/packages/linux/linux-wrt-2.4.20/140-ebtables-brnf-5.patch
index e69de29bb2..70fc354496 100644
--- a/packages/linux/linux-wrt-2.4.20/140-ebtables-brnf-5.patch
+++ b/packages/linux/linux-wrt-2.4.20/140-ebtables-brnf-5.patch
@@ -0,0 +1,5557 @@
+
+#
+# Patch managed by http://www.mn-logistik.de/unsupported/pxa250/patcher
+#
+
+--- linux-2.4.20/net/bridge/br_private.h~140-ebtables-brnf-5	2005-01-07 02:52:47.206944000 -0500
++++ linux-2.4.20/net/bridge/br_private.h	2005-01-07 02:57:30.880819576 -0500
+@@ -145,8 +145,10 @@
+ /* br_forward.c */
+ extern void br_deliver(struct net_bridge_port *to,
+ 		struct sk_buff *skb);
++extern int br_dev_queue_push_xmit(struct sk_buff *skb);
+ extern void br_forward(struct net_bridge_port *to,
+ 		struct sk_buff *skb);
++extern int br_forward_finish(struct sk_buff *skb);
+ extern void br_flood_deliver(struct net_bridge *br,
+ 		      struct sk_buff *skb,
+ 		      int clone);
+@@ -167,7 +169,8 @@
+ 			   int *ifindices);
+ 
+ /* br_input.c */
+-extern void br_handle_frame(struct sk_buff *skb);
++extern int br_handle_frame_finish(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));
+@@ -178,6 +181,10 @@
+ 	     unsigned long arg2);
+ extern int br_ioctl_deviceless_stub(unsigned long arg);
+ 
++/* br_netfilter.c */
++extern int br_netfilter_init(void);
++extern void br_netfilter_fini(void);
++
+ /* br_stp.c */
+ extern int br_is_root_bridge(struct net_bridge *br);
+ extern struct net_bridge_port *br_get_port(struct net_bridge *br,
+--- linux-2.4.20/include/linux/if_bridge.h~140-ebtables-brnf-5	2001-11-22 14:47:12.000000000 -0500
++++ linux-2.4.20/include/linux/if_bridge.h	2005-01-07 02:57:30.880819576 -0500
+@@ -102,7 +102,8 @@
+ 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);
++extern int (*br_should_route_hook)(struct sk_buff **pskb);
+ 
+ #endif
+ 
+--- linux-2.4.20/net/core/dev.c~140-ebtables-brnf-5	2005-01-07 02:52:47.208944000 -0500
++++ linux-2.4.20/net/core/dev.c	2005-01-07 02:57:30.882819272 -0500
+@@ -1393,7 +1393,7 @@
+ 
+ 
+ #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;
+ #endif
+ 
+ static __inline__ int handle_bridge(struct sk_buff *skb,
+@@ -1410,7 +1410,6 @@
+ 		}
+ 	}
+ 
+-	br_handle_frame_hook(skb);
+ 	return ret;
+ }
+ 
+@@ -1466,11 +1465,16 @@
+ 	if (skb->dev->divert && skb->dev->divert->divert)
+ 		ret = handle_diverter(skb);
+ #endif /* CONFIG_NET_DIVERT */
+-			
++
+ #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
+ 	if (skb->dev->br_port != NULL &&
+-	    br_handle_frame_hook != NULL) {
+-		return handle_bridge(skb, pt_prev);
++        br_handle_frame_hook != NULL) {
++		int ret;
++
++		ret = handle_bridge(skb, pt_prev);
++		if (br_handle_frame_hook(skb) == 0)
++			return ret;
++		pt_prev = NULL;
+ 	}
+ #endif
+ 
+@@ -1866,7 +1870,7 @@
+  *	are adjusted, %RTM_NEWLINK is sent to the routing socket and the
+  *	function returns zero.
+  */
+- 
++
+ int netdev_set_master(struct net_device *slave, struct net_device *master)
+ {
+ 	struct net_device *old = slave->master;
+--- linux-2.4.20/net/bridge/br_input.c~140-ebtables-brnf-5	2002-08-02 20:39:46.000000000 -0400
++++ linux-2.4.20/net/bridge/br_input.c	2005-01-07 02:57:30.882819272 -0500
+@@ -24,6 +24,9 @@
+ 
+ static int br_pass_frame_up_finish(struct sk_buff *skb)
+ {
++#ifdef CONFIG_NETFILTER_DEBUG
++	skb->nf_debug = 0;
++#endif
+ 	netif_rx(skb);
+ 
+ 	return 0;
+@@ -46,7 +49,7 @@
+ 			br_pass_frame_up_finish);
+ }
+ 
+-static int br_handle_frame_finish(struct sk_buff *skb)
++int br_handle_frame_finish(struct sk_buff *skb)
+ {
+ 	struct net_bridge *br;
+ 	unsigned char *dest;
+@@ -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;
+@@ -146,25 +149,35 @@
+ 		goto handle_special_frame;
+ 
+ 	if (p->state == BR_STATE_FORWARDING) {
++
++		if (br_should_route_hook && br_should_route_hook(&skb)) {
++			read_unlock(&br->lock);
++			return -1;
++		}
++
++		if (!memcmp(p->br->dev.dev_addr, dest, ETH_ALEN))
++			skb->pkt_type = PACKET_HOST;
++
+ 		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);
+ 		read_unlock(&br->lock);
+-		return;
++		return 0;
+ 	}
+ 
+ 	read_unlock(&br->lock);
+ 	kfree_skb(skb);
++	return 0;
+ }
+--- linux-2.4.20/net/bridge/br_forward.c~140-ebtables-brnf-5	2002-08-02 20:39:46.000000000 -0400
++++ linux-2.4.20/net/bridge/br_forward.c	2005-01-07 02:57:30.883819120 -0500
+@@ -30,18 +30,22 @@
+ 	return 1;
+ }
+ 
+-static int __dev_queue_push_xmit(struct sk_buff *skb)
++int br_dev_queue_push_xmit(struct sk_buff *skb)
+ {
++#ifdef CONFIG_NETFILTER
++	if (skb->nf_bridge)
++		memcpy(skb->data - 16, skb->nf_bridge->hh, 16);
++#endif
+ 	skb_push(skb, ETH_HLEN);
+ 	dev_queue_xmit(skb);
+ 
+ 	return 0;
+ }
+ 
+-static int __br_forward_finish(struct sk_buff *skb)
++int br_forward_finish(struct sk_buff *skb)
+ {
+ 	NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
+-			__dev_queue_push_xmit);
++			br_dev_queue_push_xmit);
+ 
+ 	return 0;
+ }
+@@ -49,8 +53,11 @@
+ static void __br_deliver(struct net_bridge_port *to, struct sk_buff *skb)
+ {
+ 	skb->dev = to->dev;
++#ifdef CONFIG_NETFILTER_DEBUG
++	skb->nf_debug = 0;
++#endif
+ 	NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
+-			__br_forward_finish);
++			br_forward_finish);
+ }
+ 
+ static void __br_forward(struct net_bridge_port *to, struct sk_buff *skb)
+@@ -61,7 +68,7 @@
+ 	skb->dev = to->dev;
+ 
+ 	NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
+-			__br_forward_finish);
++			br_forward_finish);
+ }
+ 
+ /* called under bridge lock */
+--- linux-2.4.20/net/bridge/br.c~140-ebtables-brnf-5	2002-11-28 18:53:15.000000000 -0500
++++ linux-2.4.20/net/bridge/br.c	2005-01-07 02:57:30.885818816 -0500
+@@ -29,6 +29,8 @@
+ #include "../atm/lec.h"
+ #endif
+ 
++int (*br_should_route_hook) (struct sk_buff **pskb) = NULL;
++
+ void br_dec_use_count()
+ {
+ 	MOD_DEC_USE_COUNT;
+@@ -43,6 +45,10 @@
+ {
+ 	printk(KERN_INFO "NET4: Ethernet Bridge 008 for NET4.0\n");
+ 
++#ifdef CONFIG_NETFILTER
++	if (br_netfilter_init())
++		return 1;
++#endif
+ 	br_handle_frame_hook = br_handle_frame;
+ 	br_ioctl_hook = br_ioctl_deviceless_stub;
+ #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
+@@ -61,6 +67,9 @@
+ 
+ static void __exit br_deinit(void)
+ {
++#ifdef CONFIG_NETFILTER
++	br_netfilter_fini();
++#endif
+ 	unregister_netdevice_notifier(&br_device_notifier);
+ 	br_call_ioctl_atomic(__br_clear_ioctl_hook);
+ 
+@@ -74,7 +83,7 @@
+ #endif
+ }
+ 
+-EXPORT_NO_SYMBOLS;
++EXPORT_SYMBOL(br_should_route_hook);
+ 
+ module_init(br_init)
+ module_exit(br_deinit)
+--- linux-2.4.20/net/bridge/Makefile~140-ebtables-brnf-5	2000-12-29 17:07:24.000000000 -0500
++++ linux-2.4.20/net/bridge/Makefile	2005-01-07 02:57:30.885818816 -0500
+@@ -7,10 +7,17 @@
+ #
+ # Note 2! The CFLAGS definition is now in the main makefile...
+ 
++export-objs := br.o
++
+ O_TARGET	:= bridge.o
+ obj-y		:= br.o br_device.o br_fdb.o br_forward.o br_if.o br_input.o \
+ 			br_ioctl.o br_notify.o br_stp.o br_stp_bpdu.o \
+ 			br_stp_if.o br_stp_timer.o
++
++ifeq ($(CONFIG_NETFILTER),y)
++obj-y		+= br_netfilter.o
++endif
++
+ obj-m		:= $(O_TARGET)
+ 
+ include $(TOPDIR)/Rules.make
+--- linux-2.4.20/include/linux/netfilter_bridge.h~140-ebtables-brnf-5	2001-06-11 22:15:27.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge.h	2005-01-07 02:57:30.885818816 -0500
+@@ -1,11 +1,14 @@
+ #ifndef __LINUX_BRIDGE_NETFILTER_H
+ #define __LINUX_BRIDGE_NETFILTER_H
+ 
+-/* bridge-specific defines for netfilter. 
++/* bridge-specific defines for netfilter.
+  */
+ 
+ #include <linux/config.h>
+ #include <linux/netfilter.h>
++#if defined(__KERNEL__) && defined(CONFIG_NETFILTER)
++#include <asm/atomic.h>
++#endif
+ 
+ /* Bridge Hooks */
+ /* After promisc drops, checksum checks. */
+@@ -18,7 +21,49 @@
+ #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
+ 
++#ifdef __KERNEL__
+ 
++#define BRNF_PKT_TYPE			0x01
++#define BRNF_BRIDGED_DNAT		0x02
++#define BRNF_DONT_TAKE_PARENT		0x04
++#define BRNF_BRIDGED			0x08
++
++enum nf_br_hook_priorities {
++	NF_BR_PRI_FIRST = INT_MIN,
++	NF_BR_PRI_NAT_DST_BRIDGED = -300,
++	NF_BR_PRI_FILTER_BRIDGED = -200,
++	NF_BR_PRI_BRNF = 0,
++	NF_BR_PRI_NAT_DST_OTHER = 100,
++	NF_BR_PRI_FILTER_OTHER = 200,
++	NF_BR_PRI_NAT_SRC = 300,
++	NF_BR_PRI_LAST = INT_MAX,
++};
++
++#ifdef CONFIG_NETFILTER
++static inline
++struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
++{
++	struct nf_bridge_info **nf_bridge = &(skb->nf_bridge);
++
++	if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) {
++		atomic_set(&(*nf_bridge)->use, 1);
++		(*nf_bridge)->mask = 0;
++		(*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
++	}
++
++	return *nf_bridge;
++}
++
++struct bridge_skb_cb {
++	union {
++		__u32 ipv4;
++	} daddr;
++};
++#endif /* CONFIG_NETFILTER */
++
++#endif /* __KERNEL__ */
+ #endif
+--- linux-2.4.20/net/Makefile~140-ebtables-brnf-5	2005-01-07 02:55:48.037454000 -0500
++++ linux-2.4.20/net/Makefile	2005-01-07 02:57:30.886818664 -0500
+@@ -7,7 +7,8 @@
+ 
+ O_TARGET :=	network.o
+ 
+-mod-subdirs :=	ipv4/netfilter ipv6/netfilter ipx irda bluetooth atm netlink sched core
++mod-subdirs :=	ipv4/netfilter ipv6/netfilter bridge/netfilter ipx irda \
++	bluetooth atm netlink sched core
+ export-objs :=	netsyms.o
+ 
+ subdir-y :=	core ethernet
+@@ -26,6 +27,12 @@
+ endif
+ endif
+ 
++ifneq ($(CONFIG_BRIDGE),n)
++ifneq ($(CONFIG_BRIDGE),)
++subdir-$(CONFIG_BRIDGE)		+= bridge/netfilter
++endif
++endif
++
+ subdir-$(CONFIG_KHTTPD)		+= khttpd
+ subdir-$(CONFIG_PACKET)		+= packet
+ subdir-$(CONFIG_NET_SCHED)	+= sched
+--- linux-2.4.20/net/Config.in~140-ebtables-brnf-5	2005-01-07 02:55:48.037454000 -0500
++++ linux-2.4.20/net/Config.in	2005-01-07 02:57:30.886818664 -0500
+@@ -68,6 +68,9 @@
+    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
+    tristate 'CCITT X.25 Packet Layer (EXPERIMENTAL)' CONFIG_X25
+    tristate 'LAPB Data Link Driver (EXPERIMENTAL)' CONFIG_LAPB
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/Makefile	2005-01-07 02:57:30.886818664 -0500
+@@ -0,0 +1,30 @@
++#
++# 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-$(CONFIG_BRIDGE_NF_EBTABLES) += ebtables.o
++obj-$(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-$(CONFIG_BRIDGE_EBT_IPF) += ebt_ip.o
++obj-$(CONFIG_BRIDGE_EBT_ARPF) += ebt_arp.o
++obj-$(CONFIG_BRIDGE_EBT_VLANF) += ebt_vlan.o
++obj-$(CONFIG_BRIDGE_EBT_MARKF) += ebt_mark_m.o
++obj-$(CONFIG_BRIDGE_EBT_802_3) += ebt_802_3.o
++obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_pkttype.o
++obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_stp.o
++obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_log.o
++obj-$(CONFIG_BRIDGE_EBT_SNAT) += ebt_snat.o
++obj-$(CONFIG_BRIDGE_EBT_DNAT) += ebt_dnat.o
++obj-$(CONFIG_BRIDGE_EBT_REDIRECT) += ebt_redirect.o
++obj-$(CONFIG_BRIDGE_EBT_MARK_T) += ebt_mark.o
++include $(TOPDIR)/Rules.make
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/Config.in	2005-01-07 02:57:30.886818664 -0500
+@@ -0,0 +1,19 @@
++#
++# Bridge netfilter configuration
++#
++dep_tristate '  Bridge: ebtables' CONFIG_BRIDGE_NF_EBTABLES $CONFIG_BRIDGE
++dep_tristate '    ebt: filter table support' CONFIG_BRIDGE_EBT_T_FILTER $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: nat table support' CONFIG_BRIDGE_EBT_T_NAT $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: broute table support' CONFIG_BRIDGE_EBT_BROUTE $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: log support' CONFIG_BRIDGE_EBT_LOG $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: IP filter support' CONFIG_BRIDGE_EBT_IPF $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: ARP filter support' CONFIG_BRIDGE_EBT_ARPF $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: 802.1Q VLAN filter support' CONFIG_BRIDGE_EBT_VLANF $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: 802.3 filter support' CONFIG_BRIDGE_EBT_802_3 $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: packet type filter support' CONFIG_BRIDGE_EBT_PKTTYPE $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: STP filter support' CONFIG_BRIDGE_EBT_STP $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: mark filter support' CONFIG_BRIDGE_EBT_MARKF $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: snat target support' CONFIG_BRIDGE_EBT_SNAT $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: dnat target support' CONFIG_BRIDGE_EBT_DNAT $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: redirect target support' CONFIG_BRIDGE_EBT_REDIRECT $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate '    ebt: mark target support' CONFIG_BRIDGE_EBT_MARK_T $CONFIG_BRIDGE_NF_EBTABLES
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebtable_filter.c	2005-01-07 02:57:30.887818512 -0500
+@@ -0,0 +1,90 @@
++/*
++ *  ebtable_filter
++ *
++ *	Authors:
++ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ *  April, 2002
++ *
++ */
++
++#include <linux/netfilter_bridge/ebtables.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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebtable_nat.c	2005-01-07 02:57:30.887818512 -0500
+@@ -0,0 +1,96 @@
++/*
++ *  ebtable_nat
++ *
++ *	Authors:
++ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ *  April, 2002
++ *
++ */
++
++#include <linux/netfilter_bridge/ebtables.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
++};
++
++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);
++}
++
++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 *))
++{
++	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},
++	{ { NULL, NULL }, ebt_nat_dst, PF_BRIDGE, NF_BR_PRE_ROUTING,
++	   NF_BR_PRI_NAT_DST_BRIDGED},
++};
++
++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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebtable_broute.c	2005-01-07 02:57:30.887818512 -0500
+@@ -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/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, "BROUTING", 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 int ebt_broute(struct sk_buff **pskb)
++{
++	int ret;
++
++	ret = ebt_do_table(NF_BR_BROUTING, pskb, (*pskb)->dev, NULL,
++	   &broute_table);
++	if (ret == NF_DROP)
++		return 1; // route it
++	return 0; // bridge it
++}
++
++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);
++	// see br_input.c
++	br_should_route_hook = ebt_broute;
++	br_write_unlock_bh(BR_NETPROTO_LOCK);
++	return ret;
++}
++
++static void __exit fini(void)
++{
++	br_write_lock_bh(BR_NETPROTO_LOCK);
++	br_should_route_hook = 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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_802_3.c	2005-01-07 02:57:30.888818360 -0500
+@@ -0,0 +1,74 @@
++/*
++ * 802_3
++ *
++ * Author:
++ * Chris Vitale csv@bluetail.com
++ *
++ * May 2003
++ * 
++ */
++
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_802_3.h>
++#include <linux/module.h>
++
++static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *in,
++   const struct net_device *out, const void *data, unsigned int datalen)
++{
++	struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
++	struct ebt_802_3_hdr *hdr = (struct ebt_802_3_hdr *)skb->mac.ethernet;
++	uint16_t type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type;
++
++	if (info->bitmask & EBT_802_3_SAP) {
++		if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP)) 
++				return EBT_NOMATCH;
++		if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
++				return EBT_NOMATCH;
++	}
++
++	if (info->bitmask & EBT_802_3_TYPE) {
++		if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
++			return EBT_NOMATCH;
++		if (FWINV(info->type != type, EBT_802_3_TYPE)) 
++			return EBT_NOMATCH;
++	}
++
++	return EBT_MATCH;
++}
++
++static struct ebt_match filter_802_3;
++static int ebt_802_3_check(const char *tablename, unsigned int hookmask,
++   const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++	struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
++
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_802_3_info)))
++		return -EINVAL;
++	if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
++		return -EINVAL;
++
++	return 0;
++}
++
++static struct ebt_match filter_802_3 =
++{
++	.name		= EBT_802_3_MATCH,
++	.match		= ebt_filter_802_3,
++	.check		= ebt_802_3_check,
++	.me		= THIS_MODULE,
++};
++
++static int __init init(void)
++{
++	return ebt_register_match(&filter_802_3);
++}
++
++static void __exit fini(void)
++{
++	ebt_unregister_match(&filter_802_3);
++}
++
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_mark.c	2005-01-07 02:57:30.888818360 -0500
+@@ -0,0 +1,66 @@
++/*
++ *  ebt_mark
++ *
++ *	Authors:
++ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ *  July, 2002
++ *
++ */
++
++// The mark target can be used in any chain
++// I believe adding a mangle table just for marking is total overkill
++// Marking a frame doesn't really change anything in the frame anyway
++
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_mark_t.h>
++#include <linux/module.h>
++
++static int ebt_target_mark(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_mark_t_info *info = (struct ebt_mark_t_info *)data;
++
++	if ((*pskb)->nfmark != info->mark) {
++		(*pskb)->nfmark = info->mark;
++		(*pskb)->nfcache |= NFC_ALTERED;
++	}
++	return info->target;
++}
++
++static int ebt_target_mark_check(const char *tablename, unsigned int hookmask,
++   const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++	struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
++
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_t_info)))
++		return -EINVAL;
++	if (BASE_CHAIN && info->target == EBT_RETURN)
++		return -EINVAL;
++	CLEAR_BASE_CHAIN_BIT;
++	if (INVALID_TARGET)
++		return -EINVAL;
++	return 0;
++}
++
++static struct ebt_target mark_target =
++{
++	{NULL, NULL}, EBT_MARK_TARGET, ebt_target_mark,
++	ebt_target_mark_check, NULL, THIS_MODULE
++};
++
++static int __init init(void)
++{
++	return ebt_register_target(&mark_target);
++}
++
++static void __exit fini(void)
++{
++	ebt_unregister_target(&mark_target);
++}
++
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_mark_m.c	2005-01-07 02:57:30.888818360 -0500
+@@ -0,0 +1,61 @@
++/*
++ *  ebt_mark_m
++ *
++ *	Authors:
++ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ *  July, 2002
++ *
++ */
++
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_mark_m.h>
++#include <linux/module.h>
++
++static int ebt_filter_mark(const struct sk_buff *skb,
++   const struct net_device *in, const struct net_device *out, const void *data,
++   unsigned int datalen)
++{
++	struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
++
++	if (info->bitmask & EBT_MARK_OR)
++		return !(!!(skb->nfmark & info->mask) ^ info->invert);
++	return !(((skb->nfmark & info->mask) == info->mark) ^ info->invert);
++}
++
++static int ebt_mark_check(const char *tablename, unsigned int hookmask,
++   const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++        struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
++
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_m_info)))
++		return -EINVAL;
++	if (info->bitmask & ~EBT_MARK_MASK)
++		return -EINVAL;
++	if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
++		return -EINVAL;
++	if (!info->bitmask)
++		return -EINVAL;
++	return 0;
++}
++
++static struct ebt_match filter_mark =
++{
++	{NULL, NULL}, EBT_MARK_MATCH, ebt_filter_mark, ebt_mark_check, NULL,
++	THIS_MODULE
++};
++
++static int __init init(void)
++{
++	return ebt_register_match(&filter_mark);
++}
++
++static void __exit fini(void)
++{
++	ebt_unregister_match(&filter_mark);
++}
++
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_pkttype.c	2005-01-07 02:57:30.888818360 -0500
+@@ -0,0 +1,60 @@
++/*
++ *  ebt_pkttype
++ *
++ *	Authors:
++ *	Bart De Schuymer <bdschuym@pandora.be>
++ *
++ *  April, 2003
++ *
++ */
++
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_pkttype.h>
++#include <linux/module.h>
++
++static int ebt_filter_pkttype(const struct sk_buff *skb,
++   const struct net_device *in,
++   const struct net_device *out,
++   const void *data,
++   unsigned int datalen)
++{
++	struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
++
++	return (skb->pkt_type != info->pkt_type) ^ info->invert;
++}
++
++static int ebt_pkttype_check(const char *tablename, unsigned int hookmask,
++   const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++	struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
++
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_pkttype_info)))
++		return -EINVAL;
++	if (info->invert != 0 && info->invert != 1)
++		return -EINVAL;
++	/* Allow any pkt_type value */
++	return 0;
++}
++
++static struct ebt_match filter_pkttype =
++{
++	.name		= EBT_PKTTYPE_MATCH,
++	.match		= ebt_filter_pkttype,
++	.check		= ebt_pkttype_check,
++	.me		= THIS_MODULE,
++};
++
++static int __init init(void)
++{
++	return ebt_register_match(&filter_pkttype);
++}
++
++static void __exit fini(void)
++{
++	ebt_unregister_match(&filter_pkttype);
++}
++
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_stp.c	2005-01-07 02:57:30.889818208 -0500
+@@ -0,0 +1,191 @@
++/*
++ *  ebt_stp
++ *
++ *	Authors:
++ *	Bart De Schuymer <bdschuym@pandora.be>
++ *	Stephen Hemminger <shemminger@osdl.org>
++ *
++ *  June, 2003
++ */
++
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_stp.h>
++#include <linux/module.h>
++
++#define BPDU_TYPE_CONFIG 0
++#define BPDU_TYPE_TCN 0x80
++
++struct stp_header {
++	uint8_t dsap;
++	uint8_t ssap;
++	uint8_t ctrl;
++	uint8_t pid;
++	uint8_t vers;
++	uint8_t type;
++};
++
++struct stp_config_pdu {
++	uint8_t flags;
++	uint8_t root[8];
++	uint8_t root_cost[4];
++	uint8_t sender[8];
++	uint8_t port[2];
++	uint8_t msg_age[2];
++	uint8_t max_age[2];
++	uint8_t hello_time[2];
++	uint8_t forward_delay[2];
++};
++
++#define NR16(p) (p[0] << 8 | p[1])
++#define NR32(p) ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3])
++
++static int ebt_filter_config(struct ebt_stp_info *info,
++   struct stp_config_pdu *stpc)
++{
++	struct ebt_stp_config_info *c;
++	uint16_t v16;
++	uint32_t v32;
++	int verdict, i;
++
++	c = &info->config;
++	if ((info->bitmask & EBT_STP_FLAGS) &&
++	    FWINV(c->flags != stpc->flags, EBT_STP_FLAGS))
++		return EBT_NOMATCH;
++	if (info->bitmask & EBT_STP_ROOTPRIO) {
++		v16 = NR16(stpc->root);
++		if (FWINV(v16 < c->root_priol ||
++		    v16 > c->root_priou, EBT_STP_ROOTPRIO))
++			return EBT_NOMATCH;
++	}
++	if (info->bitmask & EBT_STP_ROOTADDR) {
++		verdict = 0;
++		for (i = 0; i < 6; i++)
++			verdict |= (stpc->root[2+i] ^ c->root_addr[i]) &
++			           c->root_addrmsk[i];
++		if (FWINV(verdict != 0, EBT_STP_ROOTADDR))
++			return EBT_NOMATCH;
++	}
++	if (info->bitmask & EBT_STP_ROOTCOST) {
++		v32 = NR32(stpc->root_cost);
++		if (FWINV(v32 < c->root_costl ||
++		    v32 > c->root_costu, EBT_STP_ROOTCOST))
++			return EBT_NOMATCH;
++	}
++	if (info->bitmask & EBT_STP_SENDERPRIO) {
++		v16 = NR16(stpc->sender);
++		if (FWINV(v16 < c->sender_priol ||
++		    v16 > c->sender_priou, EBT_STP_SENDERPRIO))
++			return EBT_NOMATCH;
++	}
++	if (info->bitmask & EBT_STP_SENDERADDR) {
++		verdict = 0;
++		for (i = 0; i < 6; i++)
++			verdict |= (stpc->sender[2+i] ^ c->sender_addr[i]) &
++			           c->sender_addrmsk[i];
++		if (FWINV(verdict != 0, EBT_STP_SENDERADDR))
++			return EBT_NOMATCH;
++	}
++	if (info->bitmask & EBT_STP_PORT) {
++		v16 = NR16(stpc->port);
++		if (FWINV(v16 < c->portl ||
++		    v16 > c->portu, EBT_STP_PORT))
++			return EBT_NOMATCH;
++	}
++	if (info->bitmask & EBT_STP_MSGAGE) {
++		v16 = NR16(stpc->msg_age);
++		if (FWINV(v16 < c->msg_agel ||
++		    v16 > c->msg_ageu, EBT_STP_MSGAGE))
++			return EBT_NOMATCH;
++	}
++	if (info->bitmask & EBT_STP_MAXAGE) {
++		v16 = NR16(stpc->max_age);
++		if (FWINV(v16 < c->max_agel ||
++		    v16 > c->max_ageu, EBT_STP_MAXAGE))
++			return EBT_NOMATCH;
++	}
++	if (info->bitmask & EBT_STP_HELLOTIME) {
++		v16 = NR16(stpc->hello_time);
++		if (FWINV(v16 < c->hello_timel ||
++		    v16 > c->hello_timeu, EBT_STP_HELLOTIME))
++			return EBT_NOMATCH;
++	}
++	if (info->bitmask & EBT_STP_FWDD) {
++		v16 = NR16(stpc->forward_delay);
++		if (FWINV(v16 < c->forward_delayl ||
++		    v16 > c->forward_delayu, EBT_STP_FWDD))
++			return EBT_NOMATCH;
++	}
++	return EBT_MATCH;
++}
++
++static int ebt_filter_stp(const struct sk_buff *skb, const struct net_device *in,
++   const struct net_device *out, const void *data, unsigned int datalen)
++{
++	struct ebt_stp_info *info = (struct ebt_stp_info *)data;
++	struct stp_header stph;
++	uint8_t header[6] = {0x42, 0x42, 0x03, 0x00, 0x00, 0x00};
++	if (skb_copy_bits(skb, 0, &stph, sizeof(stph)))
++		return EBT_NOMATCH;
++
++	/* The stp code only considers these */
++	if (memcmp(&stph, header, sizeof(header)))
++		return EBT_NOMATCH;
++
++	if (info->bitmask & EBT_STP_TYPE
++	    && FWINV(info->type != stph.type, EBT_STP_TYPE))
++		return EBT_NOMATCH;
++
++	if (stph.type == BPDU_TYPE_CONFIG &&
++	    info->bitmask & EBT_STP_CONFIG_MASK) {
++		struct stp_config_pdu stpc;
++
++		if (skb_copy_bits(skb, sizeof(stph), &stpc, sizeof(stpc)))
++		    return EBT_NOMATCH;
++		return ebt_filter_config(info, &stpc);
++	}
++	return EBT_MATCH;
++}
++
++static int ebt_stp_check(const char *tablename, unsigned int hookmask,
++   const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++	struct ebt_stp_info *info = (struct ebt_stp_info *)data;
++	int len = EBT_ALIGN(sizeof(struct ebt_stp_info));
++	uint8_t bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
++	uint8_t msk[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
++
++	if (info->bitmask & ~EBT_STP_MASK || info->invflags & ~EBT_STP_MASK ||
++	    !(info->bitmask & EBT_STP_MASK))
++		return -EINVAL;
++	if (datalen != len)
++		return -EINVAL;
++	/* Make sure the match only receives stp frames */
++	if (memcmp(e->destmac, bridge_ula, ETH_ALEN) ||
++	    memcmp(e->destmsk, msk, ETH_ALEN) || !(e->bitmask & EBT_DESTMAC))
++		return -EINVAL;
++
++	return 0;
++}
++
++static struct ebt_match filter_stp =
++{
++	.name		= EBT_STP_MATCH,
++	.match		= ebt_filter_stp,
++	.check		= ebt_stp_check,
++	.me		= THIS_MODULE,
++};
++
++static int __init init(void)
++{
++	return ebt_register_match(&filter_stp);
++}
++
++static void __exit fini(void)
++{
++	ebt_unregister_match(&filter_stp);
++}
++
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_redirect.c	2005-01-07 02:57:30.889818208 -0500
+@@ -0,0 +1,71 @@
++/*
++ *  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/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 *info = (struct ebt_redirect_info *)data;
++
++	if (hooknr != NF_BR_BROUTING)
++		memcpy((**pskb).mac.ethernet->h_dest,
++		   in->br_port->br->dev.dev_addr, ETH_ALEN);
++	else {
++		memcpy((**pskb).mac.ethernet->h_dest,
++		   in->dev_addr, ETH_ALEN);
++		(*pskb)->pkt_type = PACKET_HOST;
++	}
++	return info->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 *info = (struct ebt_redirect_info *)data;
++
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_redirect_info)))
++		return -EINVAL;
++	if (BASE_CHAIN && info->target == EBT_RETURN)
++		return -EINVAL;
++	CLEAR_BASE_CHAIN_BIT;
++	if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) &&
++	     (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
++		return -EINVAL;
++	if (INVALID_TARGET)
++		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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_arp.c	2005-01-07 02:57:30.889818208 -0500
+@@ -0,0 +1,149 @@
++/*
++ *  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/if_ether.h>
++#include <linux/module.h>
++
++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)
++{
++	struct ebt_arp_info *info = (struct ebt_arp_info *)data;
++
++	if (info->bitmask & EBT_ARP_OPCODE && FWINV(info->opcode !=
++	   ((*skb).nh.arph)->ar_op, EBT_ARP_OPCODE))
++		return EBT_NOMATCH;
++	if (info->bitmask & EBT_ARP_HTYPE && FWINV(info->htype !=
++	   ((*skb).nh.arph)->ar_hrd, EBT_ARP_HTYPE))
++		return EBT_NOMATCH;
++	if (info->bitmask & EBT_ARP_PTYPE && FWINV(info->ptype !=
++	   ((*skb).nh.arph)->ar_pro, EBT_ARP_PTYPE))
++		return EBT_NOMATCH;
++
++	if (info->bitmask & (EBT_ARP_SRC_IP | EBT_ARP_DST_IP))
++	{
++		uint32_t arp_len = sizeof(struct arphdr) +
++		   (2 * (((*skb).nh.arph)->ar_hln)) +
++		   (2 * (((*skb).nh.arph)->ar_pln));
++		uint32_t dst;
++		uint32_t src;
++
++		// Make sure the packet is long enough.
++		if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
++			return EBT_NOMATCH;
++		// IPv4 addresses are always 4 bytes.
++		if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t))
++			return EBT_NOMATCH;
++
++		if (info->bitmask & EBT_ARP_SRC_IP) {
++			memcpy(&src, ((*skb).nh.raw) + sizeof(struct arphdr) +
++			   ((*skb).nh.arph)->ar_hln, sizeof(uint32_t));
++			if (FWINV(info->saddr != (src & info->smsk),
++			   EBT_ARP_SRC_IP))
++				return EBT_NOMATCH;
++		}
++
++		if (info->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(uint32_t));
++			if (FWINV(info->daddr != (dst & info->dmsk),
++			   EBT_ARP_DST_IP))
++				return EBT_NOMATCH;
++		}
++	}
++
++	if (info->bitmask & (EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC))
++	{
++		uint32_t arp_len = sizeof(struct arphdr) +
++		   (2 * (((*skb).nh.arph)->ar_hln)) +
++		   (2 * (((*skb).nh.arph)->ar_pln));
++		unsigned char dst[ETH_ALEN];
++		unsigned char src[ETH_ALEN];
++
++		// Make sure the packet is long enough.
++		if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
++			return EBT_NOMATCH;
++		// MAC addresses are 6 bytes.
++		if (((*skb).nh.arph)->ar_hln != ETH_ALEN)
++			return EBT_NOMATCH;
++		if (info->bitmask & EBT_ARP_SRC_MAC) {
++			uint8_t verdict, i;
++
++			memcpy(&src, ((*skb).nh.raw) +
++					sizeof(struct arphdr),
++					ETH_ALEN);
++			verdict = 0;
++			for (i = 0; i < 6; i++)
++				verdict |= (src[i] ^ info->smaddr[i]) &
++				       info->smmsk[i];	
++			if (FWINV(verdict != 0, EBT_ARP_SRC_MAC))
++				return EBT_NOMATCH;
++		}
++
++		if (info->bitmask & EBT_ARP_DST_MAC) { 
++			uint8_t verdict, i;
++
++			memcpy(&dst, ((*skb).nh.raw) +
++					sizeof(struct arphdr) +
++			   		(((*skb).nh.arph)->ar_hln) +
++			   		(((*skb).nh.arph)->ar_pln),
++					ETH_ALEN);
++			verdict = 0;
++			for (i = 0; i < 6; i++)
++				verdict |= (dst[i] ^ info->dmaddr[i]) &
++					info->dmmsk[i];
++			if (FWINV(verdict != 0, EBT_ARP_DST_MAC))
++				return EBT_NOMATCH;
++		}
++	}
++
++	return EBT_MATCH;
++}
++
++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 *info = (struct ebt_arp_info *)data;
++
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_arp_info)))
++		return -EINVAL;
++	if ((e->ethproto != __constant_htons(ETH_P_ARP) &&
++	   e->ethproto != __constant_htons(ETH_P_RARP)) ||
++	   e->invflags & EBT_IPROTO)
++		return -EINVAL;
++	if (info->bitmask & ~EBT_ARP_MASK || info->invflags & ~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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_ip.c	2005-01-07 02:57:30.890818056 -0500
+@@ -0,0 +1,121 @@
++/*
++ *  ebt_ip
++ *
++ *	Authors:
++ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ *  April, 2002
++ *
++ *  Changes:
++ *    added ip-sport and ip-dport
++ *    Innominate Security Technologies AG <mhopf@innominate.com>
++ *    September, 2002
++ */
++
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_ip.h>
++#include <linux/ip.h>
++#include <linux/in.h>
++#include <linux/module.h>
++
++struct tcpudphdr {
++	uint16_t src;
++	uint16_t dst;
++};
++
++union h_u {
++	unsigned char *raw;
++	struct tcpudphdr *tuh;
++};
++
++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)
++{
++	struct ebt_ip_info *info = (struct ebt_ip_info *)data;
++
++	if (info->bitmask & EBT_IP_TOS &&
++	   FWINV(info->tos != ((*skb).nh.iph)->tos, EBT_IP_TOS))
++		return EBT_NOMATCH;
++	if (info->bitmask & EBT_IP_PROTO) {
++		if (FWINV(info->protocol != ((*skb).nh.iph)->protocol,
++		          EBT_IP_PROTO))
++			return EBT_NOMATCH;
++		if ( info->protocol == IPPROTO_TCP ||
++		     info->protocol == IPPROTO_UDP )
++		{
++			union h_u h;
++			h.raw = skb->data + skb->nh.iph->ihl*4;
++			if (info->bitmask & EBT_IP_DPORT) {
++				uint16_t port = ntohs(h.tuh->dst);
++				if (FWINV(port < info->dport[0] ||
++				          port > info->dport[1],
++				          EBT_IP_DPORT))
++				return EBT_NOMATCH;
++			}
++			if (info->bitmask & EBT_IP_SPORT) {
++				uint16_t port = ntohs(h.tuh->src);
++				if (FWINV(port < info->sport[0] ||
++				          port > info->sport[1],
++				          EBT_IP_SPORT))
++				return EBT_NOMATCH;
++			}
++		}
++	}
++	if (info->bitmask & EBT_IP_SOURCE &&
++	   FWINV((((*skb).nh.iph)->saddr & info->smsk) !=
++	   info->saddr, EBT_IP_SOURCE))
++		return EBT_NOMATCH;
++	if ((info->bitmask & EBT_IP_DEST) &&
++	   FWINV((((*skb).nh.iph)->daddr & info->dmsk) !=
++	   info->daddr, EBT_IP_DEST))
++		return EBT_NOMATCH;
++	return EBT_MATCH;
++}
++
++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 *info = (struct ebt_ip_info *)data;
++
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_ip_info)))
++		return -EINVAL;
++	if (e->ethproto != __constant_htons(ETH_P_IP) ||
++	   e->invflags & EBT_IPROTO)
++		return -EINVAL;
++	if (info->bitmask & ~EBT_IP_MASK || info->invflags & ~EBT_IP_MASK)
++		return -EINVAL;
++	if (info->bitmask & (EBT_IP_DPORT | EBT_IP_SPORT)) {
++		if (!info->bitmask & EBT_IPROTO)
++			return -EINVAL;
++		if (info->protocol != IPPROTO_TCP &&
++		    info->protocol != IPPROTO_UDP)
++			 return -EINVAL;
++	}
++	if (info->bitmask & EBT_IP_DPORT && info->dport[0] > info->dport[1])
++		return -EINVAL;
++	if (info->bitmask & EBT_IP_SPORT && info->sport[0] > info->sport[1])
++		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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_vlan.c	2005-01-07 02:57:30.890818056 -0500
+@@ -0,0 +1,259 @@
++/*
++ * Description: EBTables 802.1Q match extension kernelspace module.
++ * Authors: Nick Fedchik <nick@fedchik.org.ua>
++ *          Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *    
++ * 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.
++ * 
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
++ * GNU General Public License for more details.
++ *  
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
++ */
++
++#include <linux/if_ether.h>
++#include <linux/if_vlan.h>
++#include <linux/module.h>
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_vlan.h>
++
++static unsigned char debug;
++#define MODULE_VERSION "0.6"
++
++MODULE_PARM(debug, "0-1b");
++MODULE_PARM_DESC(debug, "debug=1 is turn on debug messages");
++MODULE_AUTHOR("Nick Fedchik <nick@fedchik.org.ua>");
++MODULE_DESCRIPTION("802.1Q match module (ebtables extension), v"
++		   MODULE_VERSION);
++MODULE_LICENSE("GPL");
++
++
++#define DEBUG_MSG(args...) if (debug) printk (KERN_DEBUG "ebt_vlan: " args)
++#define INV_FLAG(_inv_flag_) (info->invflags & _inv_flag_) ? "!" : ""
++#define GET_BITMASK(_BIT_MASK_) info->bitmask & _BIT_MASK_
++#define SET_BITMASK(_BIT_MASK_) info->bitmask |= _BIT_MASK_
++#define EXIT_ON_MISMATCH(_MATCH_,_MASK_) if (!((info->_MATCH_ == _MATCH_)^!!(info->invflags & _MASK_))) return 1;
++
++/*
++ * Function description: ebt_filter_vlan() is main engine for 
++ * checking passed 802.1Q frame according to 
++ * the passed extension parameters (in the *data buffer)
++ * ebt_filter_vlan() is called after successfull check the rule params
++ * by ebt_check_vlan() function.
++ * Parameters:
++ * const struct sk_buff *skb - pointer to passed ethernet frame buffer
++ * const void *data - pointer to passed extension parameters
++ * unsigned int datalen - length of passed *data buffer
++ * const struct net_device *in  -
++ * const struct net_device *out -
++ * const struct ebt_counter *c -
++ * Returned values:
++ * 0 - ok (all rule params matched)
++ * 1 - miss (rule params not acceptable to the parsed frame)
++ */
++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)
++{
++	struct ebt_vlan_info *info = (struct ebt_vlan_info *) data;	/* userspace data */
++	struct vlan_ethhdr *frame = (struct vlan_ethhdr *) skb->mac.raw;	/* Passed tagged frame */
++
++	unsigned short TCI;	/* Whole TCI, given from parsed frame */
++	unsigned short id;	/* VLAN ID, given from frame TCI */
++	unsigned char prio;	/* user_priority, given from frame TCI */
++	unsigned short encap;	/* VLAN encapsulated Type/Length field, given from orig frame */
++
++	/*
++	 * Tag Control Information (TCI) consists of the following elements:
++	 * - User_priority. The user_priority field is three bits in length, 
++	 * interpreted as a binary number. 
++	 * - Canonical Format Indicator (CFI). The Canonical Format Indicator 
++	 * (CFI) is a single bit flag value. Currently ignored.
++	 * - VLAN Identifier (VID). The VID is encoded as 
++	 * an unsigned binary number. 
++	 */
++	TCI = ntohs(frame->h_vlan_TCI);
++	id = TCI & VLAN_VID_MASK;
++	prio = (TCI >> 13) & 0x7;
++	encap = frame->h_vlan_encapsulated_proto;
++
++	/*
++	 * Checking VLAN Identifier (VID)
++	 */
++	if (GET_BITMASK(EBT_VLAN_ID)) {	/* Is VLAN ID parsed? */
++		EXIT_ON_MISMATCH(id, EBT_VLAN_ID);
++	}
++	/*
++	 * Checking user_priority
++	 */
++	if (GET_BITMASK(EBT_VLAN_PRIO)) {	/* Is VLAN user_priority parsed? */
++		EXIT_ON_MISMATCH(prio, EBT_VLAN_PRIO);
++	}
++	/*
++	 * Checking Encapsulated Proto (Length/Type) field
++	 */
++	if (GET_BITMASK(EBT_VLAN_ENCAP)) {	/* Is VLAN Encap parsed? */
++		EXIT_ON_MISMATCH(encap, EBT_VLAN_ENCAP);
++	}
++	/*
++	 * All possible extension parameters was parsed.
++	 * If rule never returned by missmatch, then all ok.
++	 */
++	return 0;
++}
++
++/*
++ * Function description: ebt_vlan_check() is called when userspace 
++ * delivers the table entry to the kernel, 
++ * and to check that userspace doesn't give a bad table.
++ * Parameters:
++ * const char *tablename - table name string
++ * unsigned int hooknr - hook number
++ * const struct ebt_entry *e - ebtables entry basic set
++ * const void *data - pointer to passed extension parameters
++ * unsigned int datalen - length of passed *data buffer
++ * Returned values:
++ * 0 - ok (all delivered rule params are correct)
++ * 1 - miss (rule params is out of range, invalid, incompatible, etc.)
++ */
++static int
++ebt_check_vlan(const char *tablename,
++	       unsigned int hooknr,
++	       const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++	struct ebt_vlan_info *info = (struct ebt_vlan_info *) data;
++
++	/*
++	 * Parameters buffer overflow check 
++	 */
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_vlan_info))) {
++		DEBUG_MSG
++		    ("passed size %d is not eq to ebt_vlan_info (%d)\n",
++		     datalen, sizeof(struct ebt_vlan_info));
++		return -EINVAL;
++	}
++
++	/*
++	 * Is it 802.1Q frame checked?
++	 */
++	if (e->ethproto != __constant_htons(ETH_P_8021Q)) {
++		DEBUG_MSG
++		    ("passed entry proto %2.4X is not 802.1Q (8100)\n",
++		     (unsigned short) ntohs(e->ethproto));
++		return -EINVAL;
++	}
++
++	/*
++	 * Check for bitmask range 
++	 * True if even one bit is out of mask
++	 */
++	if (info->bitmask & ~EBT_VLAN_MASK) {
++		DEBUG_MSG("bitmask %2X is out of mask (%2X)\n",
++			  info->bitmask, EBT_VLAN_MASK);
++		return -EINVAL;
++	}
++
++	/*
++	 * Check for inversion flags range 
++	 */
++	if (info->invflags & ~EBT_VLAN_MASK) {
++		DEBUG_MSG("inversion flags %2X is out of mask (%2X)\n",
++			  info->invflags, EBT_VLAN_MASK);
++		return -EINVAL;
++	}
++
++	/*
++	 * Reserved VLAN ID (VID) values
++	 * -----------------------------
++	 * 0 - The null VLAN ID. 
++	 * 1 - The default Port VID (PVID)
++	 * 0x0FFF - Reserved for implementation use. 
++	 * if_vlan.h: VLAN_GROUP_ARRAY_LEN 4096.
++	 */
++	if (GET_BITMASK(EBT_VLAN_ID)) {	/* when vlan-id param was spec-ed */
++		if (!!info->id) {	/* if id!=0 => check vid range */
++			if (info->id > VLAN_GROUP_ARRAY_LEN) {
++				DEBUG_MSG
++				    ("id %d is out of range (1-4096)\n",
++				     info->id);
++				return -EINVAL;
++			}
++			/*
++			 * Note: This is valid VLAN-tagged frame point.
++			 * Any value of user_priority are acceptable, 
++			 * but should be ignored according to 802.1Q Std.
++			 * So we just drop the prio flag. 
++			 */
++			info->bitmask &= ~EBT_VLAN_PRIO;
++		}
++		/*
++		 * Else, id=0 (null VLAN ID)  => user_priority range (any?)
++		 */
++	}
++
++	if (GET_BITMASK(EBT_VLAN_PRIO)) {
++		if ((unsigned char) info->prio > 7) {
++			DEBUG_MSG
++			    ("prio %d is out of range (0-7)\n",
++			     info->prio);
++			return -EINVAL;
++		}
++	}
++	/*
++	 * Check for encapsulated proto range - it is possible to be 
++	 * any value for u_short range.
++	 * if_ether.h:  ETH_ZLEN        60   -  Min. octets in frame sans FCS
++	 */
++	if (GET_BITMASK(EBT_VLAN_ENCAP)) {
++		if ((unsigned short) ntohs(info->encap) < ETH_ZLEN) {
++			DEBUG_MSG
++			    ("encap frame length %d is less than minimal\n",
++			     ntohs(info->encap));
++			return -EINVAL;
++		}
++	}
++
++	return 0;
++}
++
++static struct ebt_match filter_vlan = {
++	{NULL, NULL},
++	EBT_VLAN_MATCH,
++	ebt_filter_vlan,
++	ebt_check_vlan,
++	NULL,
++	THIS_MODULE
++};
++
++/*
++ * Module initialization function.
++ */
++static int __init init(void)
++{
++	DEBUG_MSG("ebtables 802.1Q extension module v"
++		  MODULE_VERSION "\n");
++	DEBUG_MSG("module debug=%d\n", !!debug);
++	return ebt_register_match(&filter_vlan);
++}
++
++/*
++ * Module "finalization" function
++ */
++static void __exit fini(void)
++{
++	ebt_unregister_match(&filter_vlan);
++}
++
++module_init(init);
++module_exit(fini);
++
++EXPORT_NO_SYMBOLS;
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_log.c	2005-01-07 02:57:30.890818056 -0500
+@@ -0,0 +1,152 @@
++/*
++ *  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/in.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 *info = (struct ebt_log_info *)data;
++
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_log_info)))
++		return -EINVAL;
++	if (info->bitmask & ~EBT_LOG_MASK)
++		return -EINVAL;
++	if (info->loglevel >= 8)
++		return -EINVAL;
++	info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
++	return 0;
++}
++
++struct tcpudphdr
++{
++	uint16_t src;
++	uint16_t dst;
++};
++
++struct arppayload
++{
++	unsigned char mac_src[ETH_ALEN];
++	unsigned char ip_src[4];
++	unsigned char mac_dst[ETH_ALEN];
++	unsigned char ip_dst[4];
++};
++
++static void print_MAC(unsigned char *p)
++{
++	int i;
++
++	for (i = 0; i < ETH_ALEN; i++, p++)
++		printk("%02x%c", *p, i == ETH_ALEN - 1 ? ' ':':');
++}
++
++#define myNIPQUAD(a) a[0], a[1], a[2], a[3]
++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)
++{
++	struct ebt_log_info *info = (struct ebt_log_info *)data;
++	char level_string[4] = "< >";
++	level_string[1] = '0' + info->loglevel;
++
++	spin_lock_bh(&ebt_log_lock);
++	printk(level_string);
++	printk("%s IN=%s OUT=%s ", info->prefix, in ? in->name : "",
++	   out ? out->name : "");
++
++	printk("MAC source = ");
++	print_MAC((skb->mac.ethernet)->h_source);
++	printk("MAC dest = ");
++	print_MAC((skb->mac.ethernet)->h_dest);
++
++	printk("proto = 0x%04x", ntohs(((*skb).mac.ethernet)->h_proto));
++
++	if ((info->bitmask & EBT_LOG_IP) && skb->mac.ethernet->h_proto ==
++	   htons(ETH_P_IP)){
++		struct iphdr *iph = skb->nh.iph;
++		printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u,",
++		   NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
++		printk(" IP tos=0x%02X, IP proto=%d", iph->tos, iph->protocol);
++		if (iph->protocol == IPPROTO_TCP ||
++		    iph->protocol == IPPROTO_UDP) {
++			struct tcpudphdr *ports = (struct tcpudphdr *)(skb->data + iph->ihl*4);
++
++			if (skb->data + iph->ihl*4 > skb->tail) {
++				printk(" INCOMPLETE TCP/UDP header");
++				goto out;
++			}
++			printk(" SPT=%u DPT=%u", ntohs(ports->src),
++			   ntohs(ports->dst));
++		}
++		goto out;
++	}
++
++	if ((info->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;
++		printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
++		   ntohs(arph->ar_hrd), ntohs(arph->ar_pro),
++		   ntohs(arph->ar_op));
++		/* If it's for Ethernet and the lengths are OK,
++		 * then log the ARP payload */
++		if (arph->ar_hrd == __constant_htons(1) &&
++		    arph->ar_hln == ETH_ALEN &&
++		    arph->ar_pln == sizeof(uint32_t)) {
++			struct arppayload *arpp = (struct arppayload *)(skb->data + sizeof(*arph));
++
++			if (skb->data + sizeof(*arph) > skb->tail) {
++				printk(" INCOMPLETE ARP header");
++				goto out;
++			}
++
++			printk(" ARP MAC SRC=");
++			print_MAC(arpp->mac_src);
++			printk(" ARP IP SRC=%u.%u.%u.%u",
++			       myNIPQUAD(arpp->ip_src));
++			printk(" ARP MAC DST=");
++			print_MAC(arpp->mac_dst);
++			printk(" ARP IP DST=%u.%u.%u.%u",
++			       myNIPQUAD(arpp->ip_dst));
++		}
++
++	}
++out:
++	printk("\n");
++	spin_unlock_bh(&ebt_log_lock);
++}
++
++static 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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_snat.c	2005-01-07 02:57:30.891817904 -0500
+@@ -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/module.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 *info = (struct ebt_nat_info *) data;
++
++	memcpy(((**pskb).mac.ethernet)->h_source, info->mac,
++	   ETH_ALEN * sizeof(unsigned char));
++	return info->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 *info = (struct ebt_nat_info *) data;
++
++	if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))
++		return -EINVAL;
++	if (BASE_CHAIN && info->target == EBT_RETURN)
++		return -EINVAL;
++	CLEAR_BASE_CHAIN_BIT;
++	if (strcmp(tablename, "nat"))
++		return -EINVAL;
++	if (hookmask & ~(1 << NF_BR_POST_ROUTING))
++		return -EINVAL;
++	if (INVALID_TARGET)
++		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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebt_dnat.c	2005-01-07 02:57:30.891817904 -0500
+@@ -0,0 +1,65 @@
++/*
++ *  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/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 *info = (struct ebt_nat_info *)data;
++
++	memcpy(((**pskb).mac.ethernet)->h_dest, info->mac,
++	   ETH_ALEN * sizeof(unsigned char));
++	return info->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 *info = (struct ebt_nat_info *)data;
++
++	if (BASE_CHAIN && info->target == EBT_RETURN)
++		return -EINVAL;
++	CLEAR_BASE_CHAIN_BIT;
++	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 != EBT_ALIGN(sizeof(struct ebt_nat_info)))
++		return -EINVAL;
++	if (INVALID_TARGET)
++		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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/netfilter/ebtables.c	2005-01-07 02:57:30.893817600 -0500
+@@ -0,0 +1,1490 @@
++/*
++ *  ebtables
++ *
++ *  Author:
++ *  Bart De Schuymer		<bart.de.schuymer@pandora.be>
++ *
++ *  ebtables.c,v 2.0, July, 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/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
++// 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);
++	}
++}
++
++#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...)
++
++
++
++// Each cpu has its own set of counters, so there is no need for write_lock in
++// the softirq
++// For reading or updating the counters, the user context needs to
++// get a write_lock
++
++// The size of each set of counters is altered to get cache alignment
++#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
++#define COUNTER_OFFSET(n) (SMP_ALIGN(n * sizeof(struct ebt_counter)))
++#define COUNTER_BASE(c, n, cpu) ((struct ebt_counter *)(((char *)c) + \
++   COUNTER_OFFSET(n) * cpu))
++
++
++
++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)
++{
++	w->u.watcher->watcher(skb, in, out, w->data,
++	   w->watcher_size);
++	// 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)
++{
++	return m->u.match->match(skb, in, out, m->data,
++	   m->match_size);
++}
++
++static inline int ebt_dev_check(char *entry, const struct net_device *device)
++{
++	if (*entry == '\0')
++		return 0;
++	if (!device)
++		return 1;
++	return !!strcmp(entry, device->name);
++}
++
++#define FWINV2(bool,invflg) ((bool) ^ !!(e->invflags & invflg))
++// process standard matches
++static inline int ebt_basic_match(struct ebt_entry *e, struct ethhdr *h,
++   const struct net_device *in, const struct net_device *out)
++{
++	int verdict, i;
++
++	if (e->bitmask & EBT_802_3) {
++		if (FWINV2(ntohs(h->h_proto) >= 1536, EBT_IPROTO))
++			return 1;
++	} else if (!(e->bitmask & EBT_NOPROTO) &&
++	   FWINV2(e->ethproto != h->h_proto, EBT_IPROTO))
++		return 1;
++
++	if (FWINV2(ebt_dev_check(e->in, in), EBT_IIN))
++		return 1;
++	if (FWINV2(ebt_dev_check(e->out, out), EBT_IOUT))
++		return 1;
++	if ((!in || !in->br_port) ? 0 : FWINV2(ebt_dev_check(
++	   e->logical_in, &in->br_port->br->dev), EBT_ILOGICALIN))
++		return 1;
++	if ((!out || !out->br_port) ? 0 : FWINV2(ebt_dev_check(
++	   e->logical_out, &out->br_port->br->dev), EBT_ILOGICALOUT))
++		return 1;
++
++	if (e->bitmask & EBT_SOURCEMAC) {
++		verdict = 0;
++		for (i = 0; i < 6; i++)
++			verdict |= (h->h_source[i] ^ e->sourcemac[i]) &
++			   e->sourcemsk[i];
++		if (FWINV2(verdict != 0, EBT_ISOURCE) )
++			return 1;
++	}
++	if (e->bitmask & EBT_DESTMAC) {
++		verdict = 0;
++		for (i = 0; i < 6; i++)
++			verdict |= (h->h_dest[i] ^ e->destmac[i]) &
++			   e->destmsk[i];
++		if (FWINV2(verdict != 0, EBT_IDEST) )
++			return 1;
++	}
++	return 0;
++}
++
++// 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, nentries;
++	struct ebt_entry *point;
++	struct ebt_counter *counter_base, *cb_base;
++	struct ebt_entry_target *t;
++	int verdict, sp = 0;
++	struct ebt_chainstack *cs;
++	struct ebt_entries *chaininfo;
++	char *base;
++	struct ebt_table_info *private = table->private;
++
++	read_lock_bh(&table->lock);
++	cb_base = COUNTER_BASE(private->counters, private->nentries,
++	   cpu_number_map(smp_processor_id()));
++	if (private->chainstack)
++		cs = private->chainstack[cpu_number_map(smp_processor_id())];
++	else
++		cs = NULL;
++	chaininfo = private->hook_entry[hook];
++	nentries = private->hook_entry[hook]->nentries;
++	point = (struct ebt_entry *)(private->hook_entry[hook]->data);
++	counter_base = cb_base + private->hook_entry[hook]->counter_offset;
++	// base for chain jumps
++	base = private->entries;
++	i = 0;
++	while (i < nentries) {
++		if (ebt_basic_match(point, (**pskb).mac.ethernet, in, out))
++			goto letscontinue;
++
++		if (EBT_MATCH_ITERATE(point, ebt_do_match, *pskb, in, out) != 0)
++			goto letscontinue;
++
++		// increase counter
++		(*(counter_base + i)).pcnt++;
++		(*(counter_base + i)).bcnt+=(**pskb).len;
++
++		// 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);
++
++		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:
++#ifdef CONFIG_NETFILTER_DEBUG
++			if (sp == 0) {
++				BUGPRINT("RETURN on base chain");
++				// act like this is EBT_CONTINUE
++				goto letscontinue;
++			}
++#endif
++			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;
++#ifdef CONFIG_NETFILTER_DEBUG
++		if (verdict < 0) {
++			BUGPRINT("bogus standard verdict\n");
++			read_unlock_bh(&table->lock);
++			return NF_DROP;
++		}
++#endif
++		// 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);
++#ifdef CONFIG_NETFILTER_DEBUG
++		if (chaininfo->distinguisher) {
++			BUGPRINT("jump to non-chain\n");
++			read_unlock_bh(&table->lock);
++			return NF_DROP;
++		}
++#endif
++		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;
++
++	if (((char *)m) + m->match_size + sizeof(struct ebt_entry_match) >
++	   ((char *)e) + e->watchers_offset)
++		return -EINVAL;
++	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;
++
++	if (((char *)w) + w->watcher_size + sizeof(struct ebt_entry_watcher) >
++	   ((char *)e) + e->target_offset)
++		return -EINVAL;
++	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_cleanup_entry(struct ebt_entry *e, unsigned int *cnt)
++{
++	struct ebt_entry_target *t;
++
++	if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 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;
++}
++
++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;
++	}
++	// 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;
++	}
++	// (1 << NF_BR_NUMHOOKS) tells the check functions the rule is on
++	// a base chain
++	if (i < NF_BR_NUMHOOKS)
++		hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS);
++	else {
++		for (i = 0; i < udc_cnt; i++)
++			if ((char *)(cl_s[i].cs.chaininfo) > (char *)e)
++				break;
++		if (i == 0)
++			hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS);
++		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);
++	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 ((e->target_offset + t->target_size +
++	   sizeof(struct ebt_entry_target) > e->next_offset) ||
++	   (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;
++}
++
++// 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
++static 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);
++		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;
++			}
++			// this can't be 0, so the above test is correct
++			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(smp_num_cpus * sizeof(struct ebt_chainstack));
++		if (!newinfo->chainstack)
++			return -ENOMEM;
++		for (i = 0; i < smp_num_cpus; i++) {
++			newinfo->chainstack[i] =
++			   vmalloc(udc_cnt * sizeof(struct ebt_chainstack));
++			if (!newinfo->chainstack[i]) {
++				while (i)
++					vfree(newinfo->chainstack[--i]);
++				vfree(newinfo->chainstack);
++				newinfo->chainstack = NULL;
++				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=mc²):
++	// - 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.
++
++	// 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 void get_counters(struct ebt_counter *oldcounters,
++   struct ebt_counter *counters, unsigned int nentries)
++{
++	int i, cpu;
++	struct ebt_counter *counter_base;
++
++	// counters of cpu 0
++	memcpy(counters, oldcounters,
++	   sizeof(struct ebt_counter) * nentries);
++	// add other counters to those of cpu 0
++	for (cpu = 1; cpu < smp_num_cpus; cpu++) {
++		counter_base = COUNTER_BASE(oldcounters, nentries, cpu);
++		for (i = 0; i < nentries; i++) {
++			counters[i].pcnt += counter_base[i].pcnt;
++			counters[i].bcnt += counter_base[i].bcnt;
++		}
++	}
++}
++
++// replace the table
++static int do_replace(void *user, unsigned int len)
++{
++	int ret, i, countersize;
++	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;
++	}
++	countersize = COUNTER_OFFSET(tmp.nentries) * smp_num_cpus;
++	newinfo = (struct ebt_table_info *)
++	   vmalloc(sizeof(struct ebt_table_info) + countersize);
++	if (!newinfo)
++		return -ENOMEM;
++
++	if (countersize)
++		memset(newinfo->counters, 0, countersize);
++
++	newinfo->entries = (char *)vmalloc(tmp.entries_size);
++	if (!newinfo->entries) {
++		ret = -ENOMEM;
++		goto free_newinfo;
++	}
++	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_iterate;
++
++	// 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->counters, counterstmp,
++		   t->private->nentries);
++
++	t->private = newinfo;
++	write_unlock_bh(&t->lock);
++	up(&ebt_mutex);
++	// So, a user can change the chains while having messed up her counter
++	// allocation. Only reason why this is done 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->chainstack) {
++		for (i = 0; i < smp_num_cpus; i++)
++			vfree(table->chainstack[i]);
++		vfree(table->chainstack);
++	}
++	vfree(table);
++
++	if (counterstmp)
++		vfree(counterstmp);
++	return ret;
++
++free_unlock:
++	up(&ebt_mutex);
++free_iterate:
++	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) {
++		for (i = 0; i < smp_num_cpus; i++)
++			vfree(newinfo->chainstack[i]);
++		vfree(newinfo->chainstack);
++	}
++free_entries:
++	if (newinfo->entries)
++		vfree(newinfo->entries);
++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, i, countersize;
++
++	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;
++	}
++
++	countersize = COUNTER_OFFSET(table->table->nentries) * smp_num_cpus;
++	newinfo = (struct ebt_table_info *)
++	   vmalloc(sizeof(struct ebt_table_info) + countersize);
++	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 (countersize)
++		memset(newinfo->counters, 0, countersize);
++
++	// 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_chainstack;
++	}
++
++	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_chainstack;
++
++	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_chainstack:
++	if (newinfo->chainstack) {
++		for (i = 0; i < smp_num_cpus; i++)
++			vfree(newinfo->chainstack[i]);
++		vfree(newinfo->chainstack);
++	}
++	vfree(newinfo->entries);
++free_newinfo:
++	vfree(newinfo);
++	return ret;
++}
++
++void ebt_unregister_table(struct ebt_table *table)
++{
++	int i;
++
++	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->entries)
++		vfree(table->private->entries);
++	if (table->private->chainstack) {
++		for (i = 0; i < smp_num_cpus; i++)
++			vfree(table->private->chainstack[i]);
++		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("Update_counters && nomemory\n");
++		return -ENOMEM;
++	}
++
++	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;
++		t->private->counters[i].bcnt += tmp[i].bcnt;
++	}
++
++	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;
++	struct ebt_entry_target *t;
++
++	if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
++		return 0;
++
++	hlp = ubase - base + (char *)e + e->target_offset;
++	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, int cmd)
++{
++	struct ebt_replace tmp;
++	struct ebt_counter *counterstmp, *oldcounters;
++	unsigned int entries_size, nentries;
++	char *entries;
++
++	if (cmd == EBT_SO_GET_ENTRIES) {
++		entries_size = t->private->entries_size;
++		nentries = t->private->nentries;
++		entries = t->private->entries;
++		oldcounters = t->private->counters;
++	} else {
++		entries_size = t->table->entries_size;
++		nentries = t->table->nentries;
++		entries = t->table->entries;
++		oldcounters = t->table->counters;
++	}
++
++	if (copy_from_user(&tmp, user, sizeof(tmp))) {
++		BUGPRINT("Cfu didn't work\n");
++		return -EFAULT;
++	}
++
++	if (*len != sizeof(struct ebt_replace) + entries_size +
++	   (tmp.num_counters? nentries * sizeof(struct ebt_counter): 0)) {
++		BUGPRINT("Wrong size\n");
++		return -EINVAL;
++	}
++
++	if (tmp.nentries != nentries) {
++		BUGPRINT("Nentries wrong\n");
++		return -EINVAL;
++	}
++
++	if (tmp.entries_size != entries_size) {
++		BUGPRINT("Wrong size\n");
++		return -EINVAL;
++	}
++
++	// userspace might not need the counters
++	if (tmp.num_counters) {
++		if (tmp.num_counters != nentries) {
++			BUGPRINT("Num_counters wrong\n");
++			return -EINVAL;
++		}
++		counterstmp = (struct ebt_counter *)
++		   vmalloc(nentries * sizeof(struct ebt_counter));
++		if (!counterstmp) {
++			MEMPRINT("Couldn't copy counters, out of memory\n");
++			return -ENOMEM;
++		}
++		write_lock_bh(&t->lock);
++		get_counters(oldcounters, counterstmp, nentries);
++		write_unlock_bh(&t->lock);
++
++		if (copy_to_user(tmp.counters, counterstmp,
++		   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, entries, entries_size)) {
++		BUGPRINT("Couldn't copy entries to userspace\n");
++		return -EFAULT;
++	}
++	// set the match/watcher/target names right
++	return EBT_ENTRY_ITERATE(entries, entries_size,
++	   ebt_make_names, 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:
++	case EBT_SO_GET_INIT_INFO:
++		if (*len != sizeof(struct ebt_replace)){
++			ret = -EINVAL;
++			up(&ebt_mutex);
++			break;
++		}
++		if (cmd == EBT_SO_GET_INFO) {
++			tmp.nentries = t->private->nentries;
++			tmp.entries_size = t->private->entries_size;
++			tmp.valid_hooks = t->valid_hooks;
++		} else {
++			tmp.nentries = t->table->nentries;
++			tmp.entries_size = t->table->entries_size;
++			tmp.valid_hooks = t->table->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:
++	case EBT_SO_GET_INIT_ENTRIES:
++		ret = copy_everything_to_user(t, user, len, cmd);
++		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
++};
++
++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;
++
++	printk(KERN_NOTICE "Ebtables v2.0 registered\n");
++	return 0;
++}
++
++static void __exit fini(void)
++{
++	nf_unregister_sockopt(&ebt_sockopts);
++	printk(KERN_NOTICE "Ebtables v2.0 unregistered\n");
++}
++
++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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebtables.h	2005-01-07 02:57:30.893817600 -0500
+@@ -0,0 +1,361 @@
++/*
++ *  ebtables
++ *
++ *	Authors:
++ *	Bart De Schuymer		<bart.de.schuymer@pandora.be>
++ *
++ *  ebtables.c,v 2.0, September, 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>
++#include <linux/netfilter_bridge.h>
++#include <linux/if_ether.h>
++
++#define EBT_TABLE_MAXNAMELEN 32
++#define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN
++#define EBT_FUNCTION_MAXNAMELEN EBT_TABLE_MAXNAMELEN
++
++// 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_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;
++};
++
++struct ebt_counter
++{
++	uint64_t pcnt;
++	uint64_t bcnt;
++};
++
++struct ebt_entries {
++	// this field is always set to zero
++	// See EBT_ENTRY_OR_ENTRIES.
++	// Must be same size as ebt_entry.bitmask
++	unsigned int 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
++	unsigned int nentries;
++	// entry list
++	char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
++
++// 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] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
++
++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] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
++
++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] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
++
++#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
++	unsigned int bitmask;
++	unsigned int invflags;
++	uint16_t ethproto;
++	// the physical in-dev
++	char in[IFNAMSIZ];
++	// the logical in-dev
++	char logical_in[IFNAMSIZ];
++	// the physical out-dev
++	char out[IFNAMSIZ];
++	// the logical out-dev
++	char logical_out[IFNAMSIZ];
++	unsigned char sourcemac[ETH_ALEN];
++	unsigned char sourcemsk[ETH_ALEN];
++	unsigned char destmac[ETH_ALEN];
++	unsigned char destmsk[ETH_ALEN];
++	// sizeof ebt_entry + matches
++	unsigned int watchers_offset;
++	// sizeof ebt_entry + matches + watchers
++	unsigned int target_offset;
++	// sizeof ebt_entry + matches + watchers + target
++	unsigned int next_offset;
++	unsigned char elems[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
++
++// [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_INIT_INFO    (EBT_SO_GET_ENTRIES+1)
++#define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO+1)
++#define EBT_SO_GET_MAX          (EBT_SO_GET_INIT_ENTRIES+1)
++
++#ifdef __KERNEL__
++
++// return values for match() functions
++#define EBT_MATCH 0
++#define EBT_NOMATCH 1
++
++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);
++	// 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);
++	// 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];
++	// room to maintain the stack used for jumping from and into udc
++	struct ebt_chainstack **chainstack;
++	char *entries;
++	struct ebt_counter counters[0] ____cacheline_aligned;
++};
++
++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;
++};
++
++#define EBT_ALIGN(s) (((s) + (__alignof__(struct ebt_replace)-1)) & \
++		     ~(__alignof__(struct ebt_replace)-1))
++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);
++
++   // Used in the kernel match() functions
++#define FWINV(bool,invflg) ((bool) ^ !!(info->invflags & invflg))
++// True if the hook mask denotes that the rule is in a base chain,
++// used in the check() functions
++#define BASE_CHAIN (hookmask & (1 << NF_BR_NUMHOOKS))
++// Clear the bit in the hook mask that tells if the rule is on a base chain
++#define CLEAR_BASE_CHAIN_BIT (hookmask &= ~(1 << NF_BR_NUMHOOKS))
++// True if the target is not a standard target
++#define INVALID_TARGET (info->target < -NUM_STANDARD_TARGETS || info->target >= 0)
++
++#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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_802_3.h	2005-01-07 02:57:30.894817448 -0500
+@@ -0,0 +1,60 @@
++#ifndef __LINUX_BRIDGE_EBT_802_3_H
++#define __LINUX_BRIDGE_EBT_802_3_H
++
++#define EBT_802_3_SAP 0x01
++#define EBT_802_3_TYPE 0x02
++
++#define EBT_802_3_MATCH "802_3"
++
++/*
++ * If frame has DSAP/SSAP value 0xaa you must check the SNAP type
++ * to discover what kind of packet we're carrying. 
++ */
++#define CHECK_TYPE 0xaa
++
++/*
++ * Control field may be one or two bytes.  If the first byte has
++ * the value 0x03 then the entire length is one byte, otherwise it is two.
++ * One byte controls are used in Unnumbered Information frames.
++ * Two byte controls are used in Numbered Information frames.
++ */
++#define IS_UI 0x03
++
++#define EBT_802_3_MASK (EBT_802_3_SAP | EBT_802_3_TYPE | EBT_802_3)
++
++/* ui has one byte ctrl, ni has two */
++struct hdr_ui {
++	uint8_t dsap;
++	uint8_t ssap;
++	uint8_t ctrl;
++	uint8_t orig[3];
++	uint16_t type;
++};
++
++struct hdr_ni {
++	uint8_t dsap;
++	uint8_t ssap;
++	uint16_t ctrl;
++	uint8_t  orig[3];
++	uint16_t type;
++};
++
++struct ebt_802_3_hdr {
++	uint8_t  daddr[6];
++	uint8_t  saddr[6];
++	uint16_t len;
++	union {
++		struct hdr_ui ui;
++		struct hdr_ni ni;
++	} llc;
++};
++
++struct ebt_802_3_info 
++{
++	uint8_t  sap;
++	uint16_t type;
++	uint8_t  bitmask;
++	uint8_t  invflags;
++};
++
++#endif
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_arp.h	2005-01-07 02:57:30.894817448 -0500
+@@ -0,0 +1,32 @@
++#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_SRC_MAC 0x20
++#define EBT_ARP_DST_MAC 0x40
++#define EBT_ARP_MASK (EBT_ARP_OPCODE | EBT_ARP_HTYPE | EBT_ARP_PTYPE | \
++   EBT_ARP_SRC_IP | EBT_ARP_DST_IP | EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC)
++#define EBT_ARP_MATCH "arp"
++
++struct ebt_arp_info
++{
++	uint16_t htype;
++	uint16_t ptype;
++	uint16_t opcode;
++	uint32_t saddr;
++	uint32_t smsk;
++	uint32_t daddr;
++	uint32_t dmsk;
++	unsigned char smaddr[ETH_ALEN];
++	unsigned char smmsk[ETH_ALEN];
++	unsigned char dmaddr[ETH_ALEN];
++	unsigned char dmmsk[ETH_ALEN];
++	uint8_t  bitmask;
++	uint8_t  invflags;
++};
++
++#endif
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_ip.h	2005-01-07 02:57:30.894817448 -0500
+@@ -0,0 +1,43 @@
++/*
++ *  ebt_ip
++ *
++ *	Authors:
++ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ *  April, 2002
++ *
++ *  Changes:
++ *    added ip-sport and ip-dport
++ *    Innominate Security Technologies AG <mhopf@innominate.com>
++ *    September, 2002
++ */
++
++#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_SPORT 0x10
++#define EBT_IP_DPORT 0x20
++#define EBT_IP_MASK (EBT_IP_SOURCE | EBT_IP_DEST | EBT_IP_TOS | EBT_IP_PROTO |\
++ EBT_IP_SPORT | EBT_IP_DPORT )
++#define EBT_IP_MATCH "ip"
++
++// the same values are used for the invflags
++struct ebt_ip_info
++{
++	uint32_t saddr;
++	uint32_t daddr;
++	uint32_t smsk;
++	uint32_t dmsk;
++	uint8_t  tos;
++	uint8_t  protocol;
++	uint8_t  bitmask;
++	uint8_t  invflags;
++	uint16_t sport[2];
++	uint16_t dport[2];
++};
++
++#endif
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_pkttype.h	2005-01-07 02:57:30.894817448 -0500
+@@ -0,0 +1,11 @@
++#ifndef __LINUX_BRIDGE_EBT_PKTTYPE_H
++#define __LINUX_BRIDGE_EBT_PKTTYPE_H
++
++struct ebt_pkttype_info
++{
++	uint8_t pkt_type;
++	uint8_t invert;
++};
++#define EBT_PKTTYPE_MATCH "pkttype"
++
++#endif
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_stp.h	2005-01-07 02:57:30.894817448 -0500
+@@ -0,0 +1,46 @@
++#ifndef __LINUX_BRIDGE_EBT_STP_H
++#define __LINUX_BRIDGE_EBT_STP_H
++
++#define EBT_STP_TYPE		0x0001
++
++#define EBT_STP_FLAGS		0x0002
++#define EBT_STP_ROOTPRIO	0x0004
++#define EBT_STP_ROOTADDR	0x0008
++#define EBT_STP_ROOTCOST	0x0010
++#define EBT_STP_SENDERPRIO	0x0020
++#define EBT_STP_SENDERADDR	0x0040
++#define EBT_STP_PORT		0x0080
++#define EBT_STP_MSGAGE		0x0100
++#define EBT_STP_MAXAGE		0x0200
++#define EBT_STP_HELLOTIME	0x0400
++#define EBT_STP_FWDD		0x0800
++
++#define EBT_STP_MASK		0x0fff
++#define EBT_STP_CONFIG_MASK	0x0ffe
++
++#define EBT_STP_MATCH "stp"
++
++struct ebt_stp_config_info
++{
++	uint8_t flags;
++	uint16_t root_priol, root_priou;
++	char root_addr[6], root_addrmsk[6];
++	uint32_t root_costl, root_costu;
++	uint16_t sender_priol, sender_priou;
++	char sender_addr[6], sender_addrmsk[6];
++	uint16_t portl, portu;
++	uint16_t msg_agel, msg_ageu;
++	uint16_t max_agel, max_ageu;
++	uint16_t hello_timel, hello_timeu;
++	uint16_t forward_delayl, forward_delayu;
++};
++
++struct ebt_stp_info
++{
++	uint8_t type;
++	struct ebt_stp_config_info config;
++	uint16_t bitmask;
++	uint16_t invflags;
++};
++
++#endif
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_vlan.h	2005-01-07 02:57:30.895817296 -0500
+@@ -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 {
++	uint16_t id;		/* VLAN ID {1-4095} */
++	uint8_t prio;		/* VLAN User Priority {0-7} */
++	uint16_t encap;		/* VLAN Encapsulated frame code {0-65535} */
++	uint8_t bitmask;		/* Args bitmask bit 1=1 - ID arg,
++				   bit 2=1 User-Priority arg, bit 3=1 encap*/
++	uint8_t invflags;		/* Inverse bitmask  bit 1=1 - inversed ID arg, 
++				   bit 2=1 - inversed Pirority arg */
++};
++
++#endif
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_log.h	2005-01-07 02:57:30.895817296 -0500
+@@ -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
++{
++	uint8_t loglevel;
++	uint8_t prefix[EBT_LOG_PREFIX_SIZE];
++	uint32_t bitmask;
++};
++
++#endif
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_nat.h	2005-01-07 02:57:30.895817296 -0500
+@@ -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, EBT_CONTINUE or EBT_RETURN
++	int target;
++};
++#define EBT_SNAT_TARGET "snat"
++#define EBT_DNAT_TARGET "dnat"
++
++#endif
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_redirect.h	2005-01-07 02:57:30.895817296 -0500
+@@ -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	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_mark_m.h	2005-01-07 02:57:30.896817144 -0500
+@@ -0,0 +1,15 @@
++#ifndef __LINUX_BRIDGE_EBT_MARK_M_H
++#define __LINUX_BRIDGE_EBT_MARK_M_H
++
++#define EBT_MARK_AND 0x01
++#define EBT_MARK_OR 0x02
++#define EBT_MARK_MASK (EBT_MARK_AND | EBT_MARK_OR)
++struct ebt_mark_m_info
++{
++	unsigned long mark, mask;
++	uint8_t invert;
++	uint8_t bitmask;
++};
++#define EBT_MARK_MATCH "mark_m"
++
++#endif
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_bridge/ebt_mark_t.h	2005-01-07 02:57:30.896817144 -0500
+@@ -0,0 +1,12 @@
++#ifndef __LINUX_BRIDGE_EBT_MARK_T_H
++#define __LINUX_BRIDGE_EBT_MARK_T_H
++
++struct ebt_mark_t_info
++{
++	unsigned long mark;
++	// EBT_ACCEPT, EBT_DROP or EBT_CONTINUE or EBT_RETURN
++	int target;
++};
++#define EBT_MARK_TARGET "mark"
++
++#endif
+--- linux-2.4.20/include/linux/netfilter.h~140-ebtables-brnf-5	2001-11-22 14:47:48.000000000 -0500
++++ linux-2.4.20/include/linux/netfilter.h	2005-01-07 02:57:30.896817144 -0500
+@@ -117,28 +117,34 @@
+ /* This is gross, but inline doesn't cut it for avoiding the function
+    call in fast path: gcc doesn't inline (needs value tracking?). --RR */
+ #ifdef CONFIG_NETFILTER_DEBUG
+-#define NF_HOOK nf_hook_slow
++#define NF_HOOK(pf, hook, skb, indev, outdev, okfn)			\
++nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN)
++#define NF_HOOK_THRESH nf_hook_slow
+ #else
+ #define NF_HOOK(pf, hook, skb, indev, outdev, okfn)			\
+ (list_empty(&nf_hooks[(pf)][(hook)])					\
+  ? (okfn)(skb)								\
+- : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn)))
++ : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN))
++#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh)	\
++(list_empty(&nf_hooks[(pf)][(hook)])					\
++ ? (okfn)(skb)								\
++ : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), (thresh)))
+ #endif
+ 
+ int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
+ 		 struct net_device *indev, struct net_device *outdev,
+-		 int (*okfn)(struct sk_buff *));
++		 int (*okfn)(struct sk_buff *), int thresh);
+ 
+ /* Call setsockopt() */
+-int nf_setsockopt(struct sock *sk, int pf, int optval, char *opt, 
++int nf_setsockopt(struct sock *sk, int pf, int optval, char *opt,
+ 		  int len);
+ int nf_getsockopt(struct sock *sk, int pf, int optval, char *opt,
+ 		  int *len);
+ 
+ /* Packet queuing */
+-typedef int (*nf_queue_outfn_t)(struct sk_buff *skb, 
++typedef int (*nf_queue_outfn_t)(struct sk_buff *skb,
+                                 struct nf_info *info, void *data);
+-extern int nf_register_queue_handler(int pf, 
++extern int nf_register_queue_handler(int pf,
+                                      nf_queue_outfn_t outfn, void *data);
+ extern int nf_unregister_queue_handler(int pf);
+ extern void nf_reinject(struct sk_buff *skb,
+--- linux-2.4.20/include/linux/netfilter_ipv4.h~140-ebtables-brnf-5	2002-02-25 14:38:13.000000000 -0500
++++ linux-2.4.20/include/linux/netfilter_ipv4.h	2005-01-07 02:57:30.896817144 -0500
+@@ -52,8 +52,10 @@
+ enum nf_ip_hook_priorities {
+ 	NF_IP_PRI_FIRST = INT_MIN,
+ 	NF_IP_PRI_CONNTRACK = -200,
++	NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD = -175,
+ 	NF_IP_PRI_MANGLE = -150,
+ 	NF_IP_PRI_NAT_DST = -100,
++	NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50,
+ 	NF_IP_PRI_FILTER = 0,
+ 	NF_IP_PRI_NAT_SRC = 100,
+ 	NF_IP_PRI_LAST = INT_MAX,
+--- linux-2.4.20/include/linux/skbuff.h~140-ebtables-brnf-5	2002-08-02 20:39:46.000000000 -0400
++++ linux-2.4.20/include/linux/skbuff.h	2005-01-07 02:57:30.897816992 -0500
+@@ -92,6 +92,17 @@
+ struct nf_ct_info {
+ 	struct nf_conntrack *master;
+ };
++
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++struct nf_bridge_info {
++	atomic_t use;
++	struct net_device *physindev;
++	struct net_device *physoutdev;
++	unsigned int mask;
++	unsigned long hh[16 / sizeof(unsigned long)];
++};
++#endif
++
+ #endif
+ 
+ struct sk_buff_head {
+@@ -204,6 +215,9 @@
+ #ifdef CONFIG_NETFILTER_DEBUG
+         unsigned int nf_debug;
+ #endif
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	struct nf_bridge_info	*nf_bridge;	/* Saved data about a bridged frame - see br_netfilter.c */
++#endif
+ #endif /*CONFIG_NETFILTER*/
+ 
+ #if defined(CONFIG_HIPPI)
+@@ -277,7 +291,7 @@
+  * If users==1, we are the only owner and are can avoid redundant
+  * atomic change.
+  */
+- 
++
+ /**
+  *	kfree_skb - free an sk_buff
+  *	@skb: buffer to free
+@@ -285,7 +299,7 @@
+  *	Drop a reference to the buffer and free it if the usage count has
+  *	hit zero.
+  */
+- 
++
+ static inline void kfree_skb(struct sk_buff *skb)
+ {
+ 	if (atomic_read(&skb->users) == 1 || atomic_dec_and_test(&skb->users))
+@@ -1144,6 +1158,20 @@
+ 	if (nfct)
+ 		atomic_inc(&nfct->master->use);
+ }
++
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge)
++{
++	if (nf_bridge && atomic_dec_and_test(&nf_bridge->use))
++		kfree(nf_bridge);
++}
++static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge)
++{
++	if (nf_bridge)
++		atomic_inc(&nf_bridge->use);
++}
++#endif
++
+ #endif
+ 
+ #endif	/* __KERNEL__ */
+--- linux-2.4.20/net/core/netfilter.c~140-ebtables-brnf-5	2002-08-02 20:39:46.000000000 -0400
++++ linux-2.4.20/net/core/netfilter.c	2005-01-07 02:57:30.898816840 -0500
+@@ -1,4 +1,4 @@
+-/* netfilter.c: look after the filters for various protocols. 
++/* netfilter.c: look after the filters for various protocols.
+  * Heavily influenced by the old firewall.c by David Bonn and Alan Cox.
+  *
+  * Thanks to Rob `CmdrTaco' Malda for not influencing this code in any
+@@ -342,10 +342,15 @@
+ 			       const struct net_device *indev,
+ 			       const struct net_device *outdev,
+ 			       struct list_head **i,
+-			       int (*okfn)(struct sk_buff *))
++			       int (*okfn)(struct sk_buff *),
++			       int hook_thresh)
+ {
+ 	for (*i = (*i)->next; *i != head; *i = (*i)->next) {
+ 		struct nf_hook_ops *elem = (struct nf_hook_ops *)*i;
++
++		if (hook_thresh > elem->priority)
++			continue;
++
+ 		switch (elem->hook(hook, skb, indev, outdev, okfn)) {
+ 		case NF_QUEUE:
+ 			return NF_QUEUE;
+@@ -365,7 +370,7 @@
+ 			break;
+ 
+ 		default:
+-			NFDEBUG("Evil return from %p(%u).\n", 
++			NFDEBUG("Evil return from %p(%u).\n",
+ 				elem->hook, hook);
+ #endif
+ 		}
+@@ -374,7 +379,7 @@
+ }
+ 
+ int nf_register_queue_handler(int pf, nf_queue_outfn_t outfn, void *data)
+-{      
++{
+ 	int ret;
+ 
+ 	br_write_lock_bh(BR_NETPROTO_LOCK);
+@@ -400,12 +405,12 @@
+ 	return 0;
+ }
+ 
+-/* 
+- * Any packet that leaves via this function must come back 
++/*
++ * Any packet that leaves via this function must come back
+  * through nf_reinject().
+  */
+-static void nf_queue(struct sk_buff *skb, 
+-		     struct list_head *elem, 
++static void nf_queue(struct sk_buff *skb,
++		     struct list_head *elem,
+ 		     int pf, unsigned int hook,
+ 		     struct net_device *indev,
+ 		     struct net_device *outdev,
+@@ -413,6 +418,10 @@
+ {
+ 	int status;
+ 	struct nf_info *info;
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	struct net_device *physindev = NULL;
++	struct net_device *physoutdev = NULL;
++#endif
+ 
+ 	if (!queue_handler[pf].outfn) {
+ 		kfree_skb(skb);
+@@ -428,18 +437,31 @@
+ 		return;
+ 	}
+ 
+-	*info = (struct nf_info) { 
++	*info = (struct nf_info) {
+ 		(struct nf_hook_ops *)elem, pf, hook, indev, outdev, okfn };
+ 
+ 	/* Bump dev refs so they don't vanish while packet is out */
+ 	if (indev) dev_hold(indev);
+ 	if (outdev) dev_hold(outdev);
+ 
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	if (skb->nf_bridge) {
++		physindev = skb->nf_bridge->physindev;
++		if (physindev) dev_hold(physindev);
++		physoutdev = skb->nf_bridge->physoutdev;
++		if (physoutdev) dev_hold(physoutdev);
++	}
++#endif
++
+ 	status = queue_handler[pf].outfn(skb, info, queue_handler[pf].data);
+ 	if (status < 0) {
+ 		/* James M doesn't say fuck enough. */
+ 		if (indev) dev_put(indev);
+ 		if (outdev) dev_put(outdev);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++		if (physindev) dev_put(physindev);
++		if (physoutdev) dev_put(physoutdev);
++#endif
+ 		kfree(info);
+ 		kfree_skb(skb);
+ 		return;
+@@ -449,7 +471,8 @@
+ int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
+ 		 struct net_device *indev,
+ 		 struct net_device *outdev,
+-		 int (*okfn)(struct sk_buff *))
++		 int (*okfn)(struct sk_buff *),
++		 int hook_thresh)
+ {
+ 	struct list_head *elem;
+ 	unsigned int verdict;
+@@ -481,7 +504,7 @@
+ 
+ 	elem = &nf_hooks[pf][hook];
+ 	verdict = nf_iterate(&nf_hooks[pf][hook], &skb, hook, indev,
+-			     outdev, &elem, okfn);
++			     outdev, &elem, okfn, hook_thresh);
+ 	if (verdict == NF_QUEUE) {
+ 		NFDEBUG("nf_hook: Verdict = QUEUE.\n");
+ 		nf_queue(skb, elem, pf, hook, indev, outdev, okfn);
+@@ -510,6 +533,14 @@
+ 
+ 	/* We don't have BR_NETPROTO_LOCK here */
+ 	br_read_lock_bh(BR_NETPROTO_LOCK);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	if (skb->nf_bridge) {
++		if (skb->nf_bridge->physindev)
++			dev_put(skb->nf_bridge->physindev);
++		if (skb->nf_bridge->physoutdev)
++			dev_put(skb->nf_bridge->physoutdev);
++	}
++#endif
+ 	for (i = nf_hooks[info->pf][info->hook].next; i != elem; i = i->next) {
+ 		if (i == &nf_hooks[info->pf][info->hook]) {
+ 			/* The module which sent it to userspace is gone. */
+@@ -528,9 +559,9 @@
+ 
+ 	if (verdict == NF_ACCEPT) {
+ 		verdict = nf_iterate(&nf_hooks[info->pf][info->hook],
+-				     &skb, info->hook, 
++				     &skb, info->hook,
+ 				     info->indev, info->outdev, &elem,
+-				     info->okfn);
++				     info->okfn, INT_MIN);
+ 	}
+ 
+ 	switch (verdict) {
+@@ -539,20 +570,19 @@
+ 		break;
+ 
+ 	case NF_QUEUE:
+-		nf_queue(skb, elem, info->pf, info->hook, 
++		nf_queue(skb, elem, info->pf, info->hook,
+ 			 info->indev, info->outdev, info->okfn);
+ 		break;
+-
+-	case NF_DROP:
+-		kfree_skb(skb);
+-		break;
+ 	}
+ 	br_read_unlock_bh(BR_NETPROTO_LOCK);
+ 
+ 	/* Release those devices we held, or Alexey will kill me. */
+ 	if (info->indev) dev_put(info->indev);
+ 	if (info->outdev) dev_put(info->outdev);
+-	
++
++	if (verdict == NF_DROP)
++		kfree_skb(skb);
++
+ 	kfree(info);
+ 	return;
+ }
+--- linux-2.4.20/net/core/skbuff.c~140-ebtables-brnf-5	2002-08-02 20:39:46.000000000 -0400
++++ linux-2.4.20/net/core/skbuff.c	2005-01-07 02:57:30.899816688 -0500
+@@ -245,6 +245,9 @@
+ #ifdef CONFIG_NETFILTER_DEBUG
+ 	skb->nf_debug = 0;
+ #endif
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	skb->nf_bridge	  = NULL;
++#endif
+ #endif
+ #ifdef CONFIG_NET_SCHED
+ 	skb->tc_index = 0;
+@@ -325,6 +328,9 @@
+ 	}
+ #ifdef CONFIG_NETFILTER
+ 	nf_conntrack_put(skb->nfct);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	nf_bridge_put(skb->nf_bridge);
++#endif
+ #endif
+ 	skb_headerinit(skb, NULL, 0);  /* clean state */
+ 	kfree_skbmem(skb);
+@@ -391,6 +397,9 @@
+ #ifdef CONFIG_NETFILTER_DEBUG
+ 	C(nf_debug);
+ #endif
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	C(nf_bridge);
++#endif
+ #endif /*CONFIG_NETFILTER*/
+ #if defined(CONFIG_HIPPI)
+ 	C(private);
+@@ -403,6 +412,9 @@
+ 	skb->cloned = 1;
+ #ifdef CONFIG_NETFILTER
+ 	nf_conntrack_get(skb->nfct);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	nf_bridge_get(skb->nf_bridge);
++#endif
+ #endif
+ 	return n;
+ }
+@@ -437,6 +449,10 @@
+ #ifdef CONFIG_NETFILTER_DEBUG
+ 	new->nf_debug=old->nf_debug;
+ #endif
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	new->nf_bridge=old->nf_bridge;
++	nf_bridge_get(new->nf_bridge);
++#endif
+ #endif
+ #ifdef CONFIG_NET_SCHED
+ 	new->tc_index = old->tc_index;
+--- linux-2.4.20/net/ipv4/netfilter/ip_tables.c~140-ebtables-brnf-5	2002-11-28 18:53:15.000000000 -0500
++++ linux-2.4.20/net/ipv4/netfilter/ip_tables.c	2005-01-07 02:57:30.901816384 -0500
+@@ -122,12 +122,19 @@
+ static inline int
+ ip_packet_match(const struct iphdr *ip,
+ 		const char *indev,
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++		const char *physindev,
++#endif
+ 		const char *outdev,
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++		const char *physoutdev,
++#endif
+ 		const struct ipt_ip *ipinfo,
+ 		int isfrag)
+ {
+ 	size_t i;
+ 	unsigned long ret;
++	unsigned long ret2 = 1;
+ 
+ #define FWINV(bool,invflg) ((bool) ^ !!(ipinfo->invflags & invflg))
+ 
+@@ -157,7 +164,15 @@
+ 			& ((const unsigned long *)ipinfo->iniface_mask)[i];
+ 	}
+ 
+-	if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	for (i = 0, ret2 = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
++		ret2 |= (((const unsigned long *)physindev)[i]
++			^ ((const unsigned long *)ipinfo->iniface)[i])
++			& ((const unsigned long *)ipinfo->iniface_mask)[i];
++	}
++#endif
++
++	if (FWINV(ret != 0 && ret2 != 0, IPT_INV_VIA_IN)) {
+ 		dprintf("VIA in mismatch (%s vs %s).%s\n",
+ 			indev, ipinfo->iniface,
+ 			ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":"");
+@@ -170,7 +185,15 @@
+ 			& ((const unsigned long *)ipinfo->outiface_mask)[i];
+ 	}
+ 
+-	if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	for (i = 0, ret2 = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
++		ret2 |= (((const unsigned long *)physoutdev)[i]
++			^ ((const unsigned long *)ipinfo->outiface)[i])
++			& ((const unsigned long *)ipinfo->outiface_mask)[i];
++	}
++#endif
++
++	if (FWINV(ret != 0 && ret2 != 0, IPT_INV_VIA_OUT)) {
+ 		dprintf("VIA out mismatch (%s vs %s).%s\n",
+ 			outdev, ipinfo->outiface,
+ 			ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":"");
+@@ -269,6 +292,9 @@
+ 	/* Initializing verdict to NF_DROP keeps gcc happy. */
+ 	unsigned int verdict = NF_DROP;
+ 	const char *indev, *outdev;
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	const char *physindev, *physoutdev;
++#endif
+ 	void *table_base;
+ 	struct ipt_entry *e, *back;
+ 
+@@ -278,6 +304,13 @@
+ 	datalen = (*pskb)->len - ip->ihl * 4;
+ 	indev = in ? in->name : nulldevname;
+ 	outdev = out ? out->name : nulldevname;
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	physindev = ((*pskb)->nf_bridge && (*pskb)->nf_bridge->physindev) ?
++		(*pskb)->nf_bridge->physindev->name : nulldevname;
++	physoutdev = ((*pskb)->nf_bridge && (*pskb)->nf_bridge->physoutdev) ?
++		(*pskb)->nf_bridge->physoutdev->name : nulldevname;
++#endif
++
+ 	/* We handle fragments by dealing with the first fragment as
+ 	 * if it was a normal packet.  All other fragments are treated
+ 	 * normally, except that they will NEVER match rules that ask
+@@ -313,7 +346,15 @@
+ 		IP_NF_ASSERT(e);
+ 		IP_NF_ASSERT(back);
+ 		(*pskb)->nfcache |= e->nfcache;
+-		if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) {
++		if (ip_packet_match(ip, indev,
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++		    physindev,
++#endif
++		    outdev,
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++		    physoutdev,
++#endif
++		    &e->ip, offset)) {
+ 			struct ipt_entry_target *t;
+ 
+ 			if (IPT_MATCH_ITERATE(e, do_match,
+--- linux-2.4.20/net/ipv4/ip_output.c~140-ebtables-brnf-5	2002-11-28 18:53:15.000000000 -0500
++++ linux-2.4.20/net/ipv4/ip_output.c	2005-01-07 02:57:30.902816232 -0500
+@@ -879,6 +879,10 @@
+ 		/* Connection association is same as pre-frag packet */
+ 		skb2->nfct = skb->nfct;
+ 		nf_conntrack_get(skb2->nfct);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++		skb2->nf_bridge = skb->nf_bridge;
++		nf_bridge_get(skb2->nf_bridge);
++#endif
+ #ifdef CONFIG_NETFILTER_DEBUG
+ 		skb2->nf_debug = skb->nf_debug;
+ #endif
+--- linux-2.4.20/net/ipv4/netfilter/ipt_LOG.c~140-ebtables-brnf-5	2002-02-25 14:38:14.000000000 -0500
++++ linux-2.4.20/net/ipv4/netfilter/ipt_LOG.c	2005-01-07 02:57:30.902816232 -0500
+@@ -289,6 +289,18 @@
+ 	       loginfo->prefix,
+ 	       in ? in->name : "",
+ 	       out ? out->name : "");
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++	if ((*pskb)->nf_bridge) {
++		struct net_device *physindev = (*pskb)->nf_bridge->physindev;
++		struct net_device *physoutdev = (*pskb)->nf_bridge->physoutdev;
++
++		if (physindev && in != physindev)
++			printk("PHYSIN=%s ", physindev->name);
++		if (physoutdev && out != physoutdev)
++			printk("PHYSOUT=%s ", physoutdev->name);
++	}
++#endif
++
+ 	if (in && !out) {
+ 		/* MAC logging for input chain only. */
+ 		printk("MAC=");
+--- linux-2.4.20/net/ipv4/netfilter/Makefile~140-ebtables-brnf-5	2002-11-28 18:53:15.000000000 -0500
++++ linux-2.4.20/net/ipv4/netfilter/Makefile	2005-01-07 02:57:30.903816080 -0500
+@@ -76,6 +76,8 @@
+ obj-$(CONFIG_IP_NF_MATCH_UNCLEAN) += ipt_unclean.o
+ obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
+ 
++obj-$(CONFIG_IP_NF_MATCH_PHYSDEV) += ipt_physdev.o
++
+ # targets
+ obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
+ obj-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o
+--- linux-2.4.20/net/ipv4/netfilter/Config.in~140-ebtables-brnf-5	2002-11-28 18:53:15.000000000 -0500
++++ linux-2.4.20/net/ipv4/netfilter/Config.in	2005-01-07 02:57:30.903816080 -0500
+@@ -41,6 +41,9 @@
+     dep_tristate '  Unclean match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_UNCLEAN $CONFIG_IP_NF_IPTABLES
+     dep_tristate '  Owner match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_OWNER $CONFIG_IP_NF_IPTABLES
+   fi
++  if [ "$CONFIG_BRIDGE" != "n" ]; then
++    dep_tristate '  Physdev match support' CONFIG_IP_NF_MATCH_PHYSDEV
++  fi
+ # The targets
+   dep_tristate '  Packet filtering' CONFIG_IP_NF_FILTER $CONFIG_IP_NF_IPTABLES 
+   if [ "$CONFIG_IP_NF_FILTER" != "n" ]; then
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/bridge/br_netfilter.c	2005-01-07 02:57:30.904815928 -0500
+@@ -0,0 +1,636 @@
++/*
++ *	Handle firewalling
++ *	Linux ethernet bridge
++ *
++ *	Authors:
++ *	Lennert Buytenhek               <buytenh@gnu.org>
++ *	Bart De Schuymer		<bdschuym@pandora.be>
++ *
++ *	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.
++ *
++ *	Lennert dedicates this file to Kerstin Wurdinger.
++ */
++
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/ip.h>
++#include <linux/netdevice.h>
++#include <linux/skbuff.h>
++#include <linux/if_ether.h>
++#include <linux/netfilter_bridge.h>
++#include <linux/netfilter_ipv4.h>
++#include <linux/in_route.h>
++#include <net/ip.h>
++#include <asm/uaccess.h>
++#include <asm/checksum.h>
++#include "br_private.h"
++
++
++#define skb_origaddr(skb)	 (((struct bridge_skb_cb *) \
++				 (skb->cb))->daddr.ipv4)
++#define store_orig_dstaddr(skb)	 (skb_origaddr(skb) = (skb)->nh.iph->daddr)
++#define dnat_took_place(skb)	 (skb_origaddr(skb) != (skb)->nh.iph->daddr)
++#define clear_cb(skb)		 (memset(&skb_origaddr(skb), 0, \
++				 sizeof(struct bridge_skb_cb)))
++
++#define has_bridge_parent(device)	((device)->br_port != NULL)
++#define bridge_parent(device)		(&((device)->br_port->br->dev))
++
++/* We need these fake structures to make netfilter happy --
++ * lots of places assume that skb->dst != NULL, which isn't
++ * all that unreasonable.
++ *
++ * Currently, we fill in the PMTU entry because netfilter
++ * refragmentation needs it, and the rt_flags entry because
++ * ipt_REJECT needs it.  Future netfilter modules might
++ * require us to fill additional fields.
++ */
++static struct net_device __fake_net_device = {
++	.hard_header_len	= ETH_HLEN
++};
++
++static struct rtable __fake_rtable = {
++	u: {
++		dst: {
++			__refcnt:		ATOMIC_INIT(1),
++			dev:			&__fake_net_device,
++			pmtu:			1500
++		}
++	},
++
++	rt_flags:	0
++};
++
++
++/* PF_BRIDGE/PRE_ROUTING *********************************************/
++static void __br_dnat_complain(void)
++{
++	static unsigned long last_complaint = 0;
++
++	if (jiffies - last_complaint >= 5 * HZ) {
++		printk(KERN_WARNING "Performing cross-bridge DNAT requires IP "
++			"forwarding to be enabled\n");
++		last_complaint = jiffies;
++	}
++}
++
++
++/* This requires some explaining. If DNAT has taken place,
++ * we will need to fix up the destination Ethernet address,
++ * and this is a tricky process.
++ *
++ * There are two cases to consider:
++ * 1. The packet was DNAT'ed to a device in the same bridge
++ *    port group as it was received on. We can still bridge
++ *    the packet.
++ * 2. The packet was DNAT'ed to a different device, either
++ *    a non-bridged device or another bridge port group.
++ *    The packet will need to be routed.
++ *
++ * The correct way of distinguishing between these two cases is to
++ * call ip_route_input() and to look at skb->dst->dev, which is
++ * changed to the destination device if ip_route_input() succeeds.
++ *
++ * Let us first consider the case that ip_route_input() succeeds:
++ *
++ * If skb->dst->dev equals the logical bridge device the packet
++ * came in on, we can consider this bridging. We then call
++ * skb->dst->output() which will make the packet enter br_nf_local_out()
++ * not much later. In that function it is assured that the iptables
++ * FORWARD chain is traversed for the packet.
++ *
++ * Otherwise, the packet is considered to be routed and we just
++ * change the destination MAC address so that the packet will
++ * later be passed up to the IP stack to be routed.
++ *
++ * Let us now consider the case that ip_route_input() fails:
++ *
++ * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input()
++ * will fail, while __ip_route_output_key() will return success. The source
++ * address for __ip_route_output_key() is set to zero, so __ip_route_output_key
++ * thinks we're handling a locally generated packet and won't care
++ * if IP forwarding is allowed. We send a warning message to the users's
++ * log telling her to put IP forwarding on.
++ *
++ * ip_route_input() will also fail if there is no route available.
++ * In that case we just drop the packet.
++ *
++ * --Lennert, 20020411
++ * --Bart, 20020416 (updated)
++ * --Bart, 20021007 (updated)
++ */
++
++static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
++{
++#ifdef CONFIG_NETFILTER_DEBUG
++	skb->nf_debug |= (1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_FORWARD);
++#endif
++
++	if (skb->pkt_type == PACKET_OTHERHOST) {
++		skb->pkt_type = PACKET_HOST;
++		skb->nf_bridge->mask |= BRNF_PKT_TYPE;
++	}
++
++	skb->dev = bridge_parent(skb->dev);
++	skb->dst->output(skb);
++	return 0;
++}
++
++static int br_nf_pre_routing_finish(struct sk_buff *skb)
++{
++	struct net_device *dev = skb->dev;
++	struct iphdr *iph = skb->nh.iph;
++	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
++
++#ifdef CONFIG_NETFILTER_DEBUG
++	skb->nf_debug ^= (1 << NF_BR_PRE_ROUTING);
++#endif
++
++	if (nf_bridge->mask & BRNF_PKT_TYPE) {
++		skb->pkt_type = PACKET_OTHERHOST;
++		nf_bridge->mask ^= BRNF_PKT_TYPE;
++	}
++
++	if (dnat_took_place(skb)) {
++		if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
++		    dev)) {
++			struct rtable *rt;
++
++			if (!ip_route_output(&rt, iph->daddr, 0, iph->tos, 0)) {
++				/* Bridged-and-DNAT'ed traffic doesn't
++				 * require ip_forwarding.
++				 */
++				if (((struct dst_entry *)rt)->dev == dev) {
++					skb->dst = (struct dst_entry *)rt;
++					goto bridged_dnat;
++				}
++				__br_dnat_complain();
++				dst_release((struct dst_entry *)rt);
++			}
++			kfree_skb(skb);
++			return 0;
++		} else {
++			if (skb->dst->dev == dev) {
++bridged_dnat:
++				/* Tell br_nf_local_out this is a
++				 * bridged frame
++				 */
++				nf_bridge->mask |= BRNF_BRIDGED_DNAT;
++				skb->dev = nf_bridge->physindev;
++				clear_cb(skb);
++				NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING,
++					       skb, skb->dev, NULL,
++					       br_nf_pre_routing_finish_bridge,
++					       1);
++				return 0;
++			}
++			memcpy(skb->mac.ethernet->h_dest, dev->dev_addr,
++			       ETH_ALEN);
++		}
++	} else {
++		skb->dst = (struct dst_entry *)&__fake_rtable;
++		dst_hold(skb->dst);
++	}
++
++	clear_cb(skb);
++	skb->dev = nf_bridge->physindev;
++	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
++		       br_handle_frame_finish, 1);
++
++	return 0;
++}
++
++/* Replicate the checks that IPv4 does on packet reception.
++ * Set skb->dev to the bridge device (i.e. parent of the
++ * receiving device) to make netfilter happy, the REDIRECT
++ * target in particular.  Save the original destination IP
++ * address to be able to detect DNAT afterwards.
++ */
++static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
++   const struct net_device *in, const struct net_device *out,
++   int (*okfn)(struct sk_buff *))
++{
++	struct iphdr *iph;
++	__u32 len;
++	struct sk_buff *skb;
++	struct nf_bridge_info *nf_bridge;
++
++	if ((*pskb)->protocol != __constant_htons(ETH_P_IP))
++		return NF_ACCEPT;
++
++	if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
++		goto out;
++
++	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
++		goto inhdr_error;
++
++	iph = skb->nh.iph;
++	if (iph->ihl < 5 || iph->version != 4)
++		goto inhdr_error;
++
++	if (!pskb_may_pull(skb, 4*iph->ihl))
++		goto inhdr_error;
++
++	iph = skb->nh.iph;
++	if (ip_fast_csum((__u8 *)iph, iph->ihl) != 0)
++		goto inhdr_error;
++
++	len = ntohs(iph->tot_len);
++	if (skb->len < len || len < 4*iph->ihl)
++		goto inhdr_error;
++
++	if (skb->len > len) {
++		__pskb_trim(skb, len);
++		if (skb->ip_summed == CHECKSUM_HW)
++			skb->ip_summed = CHECKSUM_NONE;
++	}
++
++#ifdef CONFIG_NETFILTER_DEBUG
++	skb->nf_debug ^= (1 << NF_IP_PRE_ROUTING);
++#endif
++ 	if ((nf_bridge = nf_bridge_alloc(skb)) == NULL)
++		return NF_DROP;
++
++	if (skb->pkt_type == PACKET_OTHERHOST) {
++		skb->pkt_type = PACKET_HOST;
++		nf_bridge->mask |= BRNF_PKT_TYPE;
++	}
++
++	nf_bridge->physindev = skb->dev;
++	skb->dev = bridge_parent(skb->dev);
++	store_orig_dstaddr(skb);
++
++	NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
++		br_nf_pre_routing_finish);
++
++	return NF_STOLEN;
++
++inhdr_error:
++//	IP_INC_STATS_BH(IpInHdrErrors);
++out:
++	return NF_DROP;
++}
++
++
++/* PF_BRIDGE/LOCAL_IN ************************************************/
++/* The packet is locally destined, which requires a real
++ * dst_entry, so detach the fake one.  On the way up, the
++ * packet would pass through PRE_ROUTING again (which already
++ * took place when the packet entered the bridge), but we
++ * register an IPv4 PRE_ROUTING 'sabotage' hook that will
++ * prevent this from happening.
++ */
++static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb,
++   const struct net_device *in, const struct net_device *out,
++   int (*okfn)(struct sk_buff *))
++{
++	struct sk_buff *skb = *pskb;
++
++	if (skb->protocol != __constant_htons(ETH_P_IP))
++		return NF_ACCEPT;
++
++	if (skb->dst == (struct dst_entry *)&__fake_rtable) {
++		dst_release(skb->dst);
++		skb->dst = NULL;
++	}
++
++	return NF_ACCEPT;
++}
++
++
++/* PF_BRIDGE/FORWARD *************************************************/
++static int br_nf_forward_finish(struct sk_buff *skb)
++{
++	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
++
++#ifdef CONFIG_NETFILTER_DEBUG
++	skb->nf_debug ^= (1 << NF_BR_FORWARD);
++#endif
++
++	if (nf_bridge->mask & BRNF_PKT_TYPE) {
++		skb->pkt_type = PACKET_OTHERHOST;
++		nf_bridge->mask ^= BRNF_PKT_TYPE;
++	}
++
++	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, nf_bridge->physindev,
++			skb->dev, br_forward_finish, 1);
++
++	return 0;
++}
++
++/* This is the 'purely bridged' case.  We pass the packet to
++ * netfilter with indev and outdev set to the bridge device,
++ * but we are still able to filter on the 'real' indev/outdev
++ * because of the ipt_physdev.c module.
++ */
++static unsigned int br_nf_forward(unsigned int hook, struct sk_buff **pskb,
++   const struct net_device *in, const struct net_device *out,
++   int (*okfn)(struct sk_buff *))
++{
++	struct sk_buff *skb = *pskb;
++	struct nf_bridge_info *nf_bridge;
++
++	if (skb->protocol != __constant_htons(ETH_P_IP))
++		return NF_ACCEPT;
++
++#ifdef CONFIG_NETFILTER_DEBUG
++	skb->nf_debug ^= (1 << NF_BR_FORWARD);
++#endif
++
++	nf_bridge = skb->nf_bridge;
++	if (skb->pkt_type == PACKET_OTHERHOST) {
++		skb->pkt_type = PACKET_HOST;
++		nf_bridge->mask |= BRNF_PKT_TYPE;
++	}
++
++	nf_bridge->mask |= BRNF_BRIDGED; /* The physdev module checks on this */
++	nf_bridge->physoutdev = skb->dev;
++
++	NF_HOOK(PF_INET, NF_IP_FORWARD, skb, bridge_parent(nf_bridge->physindev),
++			bridge_parent(skb->dev), br_nf_forward_finish);
++
++	return NF_STOLEN;
++}
++
++
++/* PF_BRIDGE/LOCAL_OUT ***********************************************/
++static int br_nf_local_out_finish(struct sk_buff *skb)
++{
++#ifdef CONFIG_NETFILTER_DEBUG
++	skb->nf_debug &= ~(1 << NF_BR_LOCAL_OUT);
++#endif
++
++	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
++			br_forward_finish, NF_BR_PRI_FIRST + 1);
++
++	return 0;
++}
++
++
++/* This function sees both locally originated IP packets and forwarded
++ * IP packets (in both cases the destination device is a bridge
++ * device). It also sees bridged-and-DNAT'ed packets.
++ * To be able to filter on the physical bridge devices (with the ipt_physdev.c
++ * module), we steal packets destined to a bridge device away from the
++ * PF_INET/FORWARD and PF_INET/OUTPUT hook functions, and give them back later,
++ * when we have determined the real output device. This is done in here.
++ *
++ * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged
++ * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward()
++ * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority
++ * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor
++ * will be executed.
++ * Otherwise, if nf_bridge->physindev is NULL, the bridge-nf code never touched
++ * this packet before, and so the packet was locally originated. We fake
++ * the PF_INET/LOCAL_OUT hook.
++ * Finally, if nf_bridge->physindev isn't NULL, then the packet was IP routed,
++ * so we fake the PF_INET/FORWARD hook. ipv4_sabotage_out() makes sure
++ * even routed packets that didn't arrive on a bridge interface have their
++ * nf_bridge->physindev set.
++ */
++
++static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
++   const struct net_device *in, const struct net_device *out,
++   int (*_okfn)(struct sk_buff *))
++{
++	int (*okfn)(struct sk_buff *skb);
++	struct net_device *realindev;
++	struct sk_buff *skb = *pskb;
++	struct nf_bridge_info *nf_bridge;
++
++	if (skb->protocol != __constant_htons(ETH_P_IP))
++		return NF_ACCEPT;
++
++	/* Sometimes we get packets with NULL ->dst here (for example,
++	 * running a dhcp client daemon triggers this).
++	 */
++	if (skb->dst == NULL)
++		return NF_ACCEPT;
++
++	nf_bridge = skb->nf_bridge;
++	nf_bridge->physoutdev = skb->dev;
++
++	realindev = nf_bridge->physindev;
++
++	/* Bridged, take PF_BRIDGE/FORWARD.
++	 * (see big note in front of br_nf_pre_routing_finish)
++	 */
++	if (nf_bridge->mask & BRNF_BRIDGED_DNAT) {
++		okfn = br_forward_finish;
++
++		if (nf_bridge->mask & BRNF_PKT_TYPE) {
++			skb->pkt_type = PACKET_OTHERHOST;
++			nf_bridge->mask ^= BRNF_PKT_TYPE;
++		}
++
++		NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev,
++			skb->dev, okfn);
++	} else {
++		okfn = br_nf_local_out_finish;
++		/* IP forwarded traffic has a physindev, locally
++		 * generated traffic hasn't.
++		 */
++		if (realindev != NULL) {
++			if (((nf_bridge->mask & BRNF_DONT_TAKE_PARENT) == 0) &&
++			    has_bridge_parent(realindev))
++				realindev = bridge_parent(realindev);
++
++			NF_HOOK_THRESH(PF_INET, NF_IP_FORWARD, skb, realindev,
++				       bridge_parent(skb->dev), okfn,
++				       NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD + 1);
++		} else {
++#ifdef CONFIG_NETFILTER_DEBUG
++			skb->nf_debug ^= (1 << NF_IP_LOCAL_OUT);
++#endif
++
++			NF_HOOK_THRESH(PF_INET, NF_IP_LOCAL_OUT, skb, realindev,
++				       bridge_parent(skb->dev), okfn,
++				       NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1);
++		}
++	}
++
++	return NF_STOLEN;
++}
++
++
++/* PF_BRIDGE/POST_ROUTING ********************************************/
++static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
++   const struct net_device *in, const struct net_device *out,
++   int (*okfn)(struct sk_buff *))
++{
++	struct sk_buff *skb = *pskb;
++	struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge;
++
++	/* Be very paranoid. Must be a device driver bug. */
++	if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) {
++		printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: "
++				 "bad mac.raw pointer.");
++		if (skb->dev != NULL) {
++			printk("[%s]", skb->dev->name);
++			if (has_bridge_parent(skb->dev))
++				printk("[%s]", bridge_parent(skb->dev)->name);
++		}
++		printk("\n");
++		return NF_ACCEPT;
++	}
++
++	if (skb->protocol != __constant_htons(ETH_P_IP))
++		return NF_ACCEPT;
++
++	/* Sometimes we get packets with NULL ->dst here (for example,
++	 * running a dhcp client daemon triggers this).
++	 */
++	if (skb->dst == NULL)
++		return NF_ACCEPT;
++
++#ifdef CONFIG_NETFILTER_DEBUG
++	skb->nf_debug ^= (1 << NF_IP_POST_ROUTING);
++#endif
++
++	/* We assume any code from br_dev_queue_push_xmit onwards doesn't care
++	 * about the value of skb->pkt_type.
++	 */
++	if (skb->pkt_type == PACKET_OTHERHOST) {
++		skb->pkt_type = PACKET_HOST;
++		nf_bridge->mask |= BRNF_PKT_TYPE;
++	}
++
++	memcpy(nf_bridge->hh, skb->data - 16, 16);
++
++	NF_HOOK(PF_INET, NF_IP_POST_ROUTING, skb, NULL,
++		bridge_parent(skb->dev), br_dev_queue_push_xmit);
++
++	return NF_STOLEN;
++}
++
++
++/* IPv4/SABOTAGE *****************************************************/
++
++/* Don't hand locally destined packets to PF_INET/PRE_ROUTING
++ * for the second time.
++ */
++static unsigned int ipv4_sabotage_in(unsigned int hook, struct sk_buff **pskb,
++   const struct net_device *in, const struct net_device *out,
++   int (*okfn)(struct sk_buff *))
++{
++	if (in->hard_start_xmit == br_dev_xmit &&
++	    okfn != br_nf_pre_routing_finish) {
++		okfn(*pskb);
++		return NF_STOLEN;
++	}
++
++	return NF_ACCEPT;
++}
++
++/* Postpone execution of PF_INET/FORWARD, PF_INET/LOCAL_OUT
++ * and PF_INET/POST_ROUTING until we have done the forwarding
++ * decision in the bridge code and have determined skb->physoutdev.
++ */
++static unsigned int ipv4_sabotage_out(unsigned int hook, struct sk_buff **pskb,
++   const struct net_device *in, const struct net_device *out,
++   int (*okfn)(struct sk_buff *))
++{
++	if (out->hard_start_xmit == br_dev_xmit &&
++	    okfn != br_nf_forward_finish &&
++	    okfn != br_nf_local_out_finish &&
++	    okfn != br_dev_queue_push_xmit) {
++		struct sk_buff *skb = *pskb;
++		struct nf_bridge_info *nf_bridge;
++
++		if (!skb->nf_bridge && !nf_bridge_alloc(skb))
++			return NF_DROP;
++
++		nf_bridge = skb->nf_bridge;
++
++		/* This frame will arrive on PF_BRIDGE/LOCAL_OUT and we
++		 * will need the indev then. For a brouter, the real indev
++		 * can be a bridge port, so we make sure br_nf_local_out()
++		 * doesn't use the bridge parent of the indev by using
++		 * the BRNF_DONT_TAKE_PARENT mask.
++		 */
++		if (hook == NF_IP_FORWARD && nf_bridge->physindev == NULL) {
++			nf_bridge->mask &= BRNF_DONT_TAKE_PARENT;
++			nf_bridge->physindev = (struct net_device *)in;
++		}
++		okfn(skb);
++		return NF_STOLEN;
++	}
++
++	return NF_ACCEPT;
++}
++
++/* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent
++ * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input.
++ * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because
++ * ip_refrag() can return NF_STOLEN.
++ */
++static struct nf_hook_ops br_nf_ops[] = {
++	{ .hook = br_nf_pre_routing,
++	  .pf = PF_BRIDGE,
++	  .hooknum = NF_BR_PRE_ROUTING,
++	  .priority = NF_BR_PRI_BRNF, },
++	{ .hook = br_nf_local_in,
++	  .pf = PF_BRIDGE,
++	  .hooknum = NF_BR_LOCAL_IN,
++	  .priority = NF_BR_PRI_BRNF, },
++	{ .hook = br_nf_forward,
++	  .pf = PF_BRIDGE,
++	  .hooknum = NF_BR_FORWARD,
++	  .priority = NF_BR_PRI_BRNF, },
++	{ .hook = br_nf_local_out,
++	  .pf = PF_BRIDGE,
++	  .hooknum = NF_BR_LOCAL_OUT,
++	  .priority = NF_BR_PRI_FIRST, },
++	{ .hook = br_nf_post_routing,
++	  .pf = PF_BRIDGE,
++	  .hooknum = NF_BR_POST_ROUTING,
++	  .priority = NF_BR_PRI_LAST, },
++	{ .hook = ipv4_sabotage_in,
++	  .pf = PF_INET,
++	  .hooknum = NF_IP_PRE_ROUTING,
++	  .priority = NF_IP_PRI_FIRST, },
++	{ .hook = ipv4_sabotage_out,
++	  .pf = PF_INET,
++	  .hooknum = NF_IP_FORWARD,
++	  .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, },
++	{ .hook = ipv4_sabotage_out,
++	  .pf = PF_INET,
++	  .hooknum = NF_IP_LOCAL_OUT,
++	  .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, },
++	{ .hook = ipv4_sabotage_out,
++	  .pf = PF_INET,
++	  .hooknum = NF_IP_POST_ROUTING,
++	  .priority = NF_IP_PRI_FIRST, },
++};
++
++int br_netfilter_init(void)
++{
++	int i;
++
++	for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) {
++		int ret;
++
++		if ((ret = nf_register_hook(&br_nf_ops[i])) >= 0)
++			continue;
++
++		while (i--)
++			nf_unregister_hook(&br_nf_ops[i]);
++
++		return ret;
++	}
++
++	printk(KERN_NOTICE "Bridge firewalling registered\n");
++
++	return 0;
++}
++
++void br_netfilter_fini(void)
++{
++	int i;
++
++	for (i = ARRAY_SIZE(br_nf_ops) - 1; i >= 0; i--)
++		nf_unregister_hook(&br_nf_ops[i]);
++}
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/net/ipv4/netfilter/ipt_physdev.c	2005-01-07 02:57:30.904815928 -0500
+@@ -0,0 +1,127 @@
++/* Kernel module to match the bridge port in and
++ * out device for IP packets coming into contact with a bridge. */
++#include <linux/module.h>
++#include <linux/skbuff.h>
++#include <linux/netfilter_ipv4/ipt_physdev.h>
++#include <linux/netfilter_ipv4/ip_tables.h>
++#include <linux/netfilter_bridge.h>
++#include <linux/netdevice.h>
++#define MATCH   1
++#define NOMATCH 0
++
++static int
++match(const struct sk_buff *skb,
++      const struct net_device *in,
++      const struct net_device *out,
++      const void *matchinfo,
++      int offset,
++      const void *hdr,
++      u_int16_t datalen,
++      int *hotdrop)
++{
++	int i;
++	static const char nulldevname[IFNAMSIZ] = { 0 };
++	const struct ipt_physdev_info *info = matchinfo;
++	unsigned long ret;
++	const char *indev, *outdev;
++	struct nf_bridge_info *nf_bridge;
++
++	/* Not a bridged IP packet or no info available yet:
++	 * LOCAL_OUT/mangle and LOCAL_OUT/nat don't know if
++	 * the destination device will be a bridge. */
++	if (!(nf_bridge = skb->nf_bridge)) {
++		/* Return MATCH if the invert flags of the used options are on */
++		if ((info->bitmask & IPT_PHYSDEV_OP_BRIDGED) &&
++		    !(info->invert & IPT_PHYSDEV_OP_BRIDGED))
++			return NOMATCH;
++		if ((info->bitmask & IPT_PHYSDEV_OP_ISIN) &&
++		    !(info->invert & IPT_PHYSDEV_OP_ISIN))
++			return NOMATCH;
++		if ((info->bitmask & IPT_PHYSDEV_OP_ISOUT) &&
++		    !(info->invert & IPT_PHYSDEV_OP_ISOUT))
++			return NOMATCH;
++		if ((info->bitmask & IPT_PHYSDEV_OP_IN) &&
++		    !(info->invert & IPT_PHYSDEV_OP_IN))
++			return NOMATCH;
++		if ((info->bitmask & IPT_PHYSDEV_OP_OUT) &&
++		    !(info->invert & IPT_PHYSDEV_OP_OUT))
++			return NOMATCH;
++		return MATCH;
++	}
++
++	/* This only makes sense in the FORWARD and POSTROUTING chains */
++	if ((info->bitmask & IPT_PHYSDEV_OP_BRIDGED) &&
++	    (!!(nf_bridge->mask & BRNF_BRIDGED) ^
++	    !(info->invert & IPT_PHYSDEV_OP_BRIDGED)))
++		return NOMATCH;
++
++	if ((info->bitmask & IPT_PHYSDEV_OP_ISIN &&
++	    (!nf_bridge->physindev ^ !!(info->invert & IPT_PHYSDEV_OP_ISIN))) ||
++	    (info->bitmask & IPT_PHYSDEV_OP_ISOUT &&
++	    (!nf_bridge->physoutdev ^ !!(info->invert & IPT_PHYSDEV_OP_ISOUT))))
++		return NOMATCH;
++
++	if (!(info->bitmask & IPT_PHYSDEV_OP_IN))
++		goto match_outdev;
++	indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname;
++	for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
++		ret |= (((const unsigned long *)indev)[i]
++			^ ((const unsigned long *)info->physindev)[i])
++			& ((const unsigned long *)info->in_mask)[i];
++	}
++
++	if ((ret == 0) ^ !(info->invert & IPT_PHYSDEV_OP_IN))
++		return NOMATCH;
++
++match_outdev:
++	if (!(info->bitmask & IPT_PHYSDEV_OP_OUT))
++		return MATCH;
++	outdev = nf_bridge->physoutdev ?
++		 nf_bridge->physoutdev->name : nulldevname;
++	for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
++		ret |= (((const unsigned long *)outdev)[i]
++			^ ((const unsigned long *)info->physoutdev)[i])
++			& ((const unsigned long *)info->out_mask)[i];
++	}
++
++	return (ret != 0) ^ !(info->invert & IPT_PHYSDEV_OP_OUT);
++}
++
++static int
++checkentry(const char *tablename,
++		       const struct ipt_ip *ip,
++		       void *matchinfo,
++		       unsigned int matchsize,
++		       unsigned int hook_mask)
++{
++	const struct ipt_physdev_info *info = matchinfo;
++
++	if (matchsize != IPT_ALIGN(sizeof(struct ipt_physdev_info)))
++		return 0;
++	if (!(info->bitmask & IPT_PHYSDEV_OP_MASK) ||
++	    info->bitmask & ~IPT_PHYSDEV_OP_MASK)
++		return 0;
++	return 1;
++}
++
++static struct ipt_match physdev_match = {
++	.name		= "physdev",
++	.match		= &match,
++	.checkentry	= &checkentry,
++	.me		= THIS_MODULE,
++};
++
++static int __init init(void)
++{
++	return ipt_register_match(&physdev_match);
++}
++
++static void __exit fini(void)
++{
++	ipt_unregister_match(&physdev_match);
++}
++
++module_init(init);
++module_exit(fini);
++MODULE_LICENSE("GPL");
++EXPORT_NO_SYMBOLS;
+--- /dev/null	2004-04-06 13:56:48.000000000 -0400
++++ linux-2.4.20/include/linux/netfilter_ipv4/ipt_physdev.h	2005-01-07 02:57:30.905815776 -0500
+@@ -0,0 +1,24 @@
++#ifndef _IPT_PHYSDEV_H
++#define _IPT_PHYSDEV_H
++
++#ifdef __KERNEL__
++#include <linux/if.h>
++#endif
++
++#define IPT_PHYSDEV_OP_IN		0x01
++#define IPT_PHYSDEV_OP_OUT		0x02
++#define IPT_PHYSDEV_OP_BRIDGED		0x04
++#define IPT_PHYSDEV_OP_ISIN		0x08
++#define IPT_PHYSDEV_OP_ISOUT		0x10
++#define IPT_PHYSDEV_OP_MASK		(0x20 - 1)
++
++struct ipt_physdev_info {
++	u_int8_t invert;
++	u_int8_t bitmask;
++	char physindev[IFNAMSIZ];
++	char in_mask[IFNAMSIZ];
++	char physoutdev[IFNAMSIZ];
++	char out_mask[IFNAMSIZ];
++};
++
++#endif /*_IPT_PHYSDEV_H*/