diff options
Diffstat (limited to 'target/linux/linux-2.4/patches/generic/100-ebtables.patch')
| -rw-r--r-- | target/linux/linux-2.4/patches/generic/100-ebtables.patch | 7012 |
1 files changed, 7012 insertions, 0 deletions
diff --git a/target/linux/linux-2.4/patches/generic/100-ebtables.patch b/target/linux/linux-2.4/patches/generic/100-ebtables.patch new file mode 100644 index 000000000..b1c34abe4 --- /dev/null +++ b/target/linux/linux-2.4/patches/generic/100-ebtables.patch @@ -0,0 +1,7012 @@ +--- linux-2.4.29/net/bridge/br_private.h 2004-08-08 01:26:06.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/net/bridge/br_private.h 2005-03-14 21:24:04.000000000 +0100 +@@ -143,8 +143,10 @@ extern void br_fdb_insert(struct net_bri + /* 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); +@@ -165,7 +167,8 @@ extern void br_get_port_ifindices(struct + 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 int br_ioctl(struct net_bridge *br, +@@ -175,6 +178,10 @@ extern int br_ioctl(struct net_bridge *b + 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-2.4.29/include/linux/if_bridge.h 2001-11-22 20:47:12.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/if_bridge.h 2005-03-14 21:11:28.000000000 +0100 +@@ -102,7 +102,8 @@ struct net_bridge; + 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-2.4.29/net/core/dev.c 2004-04-14 15:05:41.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/net/core/dev.c 2005-03-14 00:00:29.000000000 +0100 +@@ -1426,7 +1426,7 @@ static void net_tx_action(struct softirq + + + #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, +@@ -1443,7 +1443,6 @@ static __inline__ int handle_bridge(stru + } + } + +- br_handle_frame_hook(skb); + return ret; + } + +@@ -1503,7 +1502,12 @@ int netif_receive_skb(struct sk_buff *sk + #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) + if (skb->dev->br_port != NULL && br_handle_frame_hook != NULL && + skb->pkt_type != PACKET_LOOPBACK) { +- return handle_bridge(skb, pt_prev); ++ int ret; ++ ++ ret = handle_bridge(skb, pt_prev); ++ if (br_handle_frame_hook(skb) == 0) ++ return ret; ++ pt_prev = NULL; + } + #endif + +--- linux-2.4.29/net/bridge/br_input.c 2003-08-25 13:44:44.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/net/bridge/br_input.c 2005-03-14 00:00:29.000000000 +0100 +@@ -24,6 +24,9 @@ unsigned char bridge_ula[6] = { 0x01, 0x + + 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 @@ static void br_pass_frame_up(struct net_ + 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 @@ err_nolock: + 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; +@@ -146,26 +149,35 @@ void br_handle_frame(struct sk_buff *skb + 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]) { + NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,NULL, + br_stp_handle_bpdu); + read_unlock(&br->lock); +- return; ++ return 0; + } + + read_unlock(&br->lock); + kfree_skb(skb); ++ return 0; + } +--- linux-2.4.29/net/bridge/br_forward.c 2003-11-28 19:26:21.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/br_forward.c 2005-03-14 00:00:29.000000000 +0100 +@@ -30,18 +30,21 @@ static inline int should_deliver(struct + 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 ++ nf_bridge_maybe_copy_header(skb); ++#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 +52,11 @@ static int __br_forward_finish(struct sk + 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) +@@ -62,7 +68,7 @@ static void __br_forward(struct net_brid + skb->ip_summed = CHECKSUM_NONE; + + NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev, +- __br_forward_finish); ++ br_forward_finish); + } + + /* called under bridge lock */ +--- linux-2.4.29/net/bridge/br.c 2004-08-08 01:26:06.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/net/bridge/br.c 2005-03-14 00:00:29.000000000 +0100 +@@ -30,6 +30,8 @@ + #include "../atm/lec.h" + #endif + ++int (*br_should_route_hook) (struct sk_buff **pskb) = NULL; ++ + void br_dec_use_count() + { + MOD_DEC_USE_COUNT; +@@ -44,6 +46,10 @@ static int __init br_init(void) + { + 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) +@@ -57,6 +63,9 @@ static int __init br_init(void) + + static void __exit br_deinit(void) + { ++#ifdef CONFIG_NETFILTER ++ br_netfilter_fini(); ++#endif + unregister_netdevice_notifier(&br_device_notifier); + + rtnl_lock(); +@@ -73,7 +82,7 @@ static void __exit br_deinit(void) + #endif + } + +-EXPORT_NO_SYMBOLS; ++EXPORT_SYMBOL(br_should_route_hook); + + module_init(br_init) + module_exit(br_deinit) +--- linux-2.4.29/net/bridge/Makefile 2000-12-29 23:07:24.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/Makefile 2005-03-14 00:00:29.000000000 +0100 +@@ -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-2.4.29/include/linux/netfilter_bridge.h 2001-06-12 04:15:27.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge.h 2005-03-14 21:24:06.000000000 +0100 +@@ -6,6 +6,10 @@ + + #include <linux/config.h> + #include <linux/netfilter.h> ++#if defined(__KERNEL__) && defined(CONFIG_NETFILTER) ++#include <asm/atomic.h> ++#include <linux/if_ether.h> ++#endif + + /* Bridge Hooks */ + /* After promisc drops, checksum checks. */ +@@ -18,7 +22,76 @@ + #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 ++#define BRNF_NF_BRIDGE_PREROUTING 0x10 ++ ++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; ++#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) ++ (*nf_bridge)->netoutdev = NULL; ++#endif ++ } ++ ++ return *nf_bridge; ++} ++ ++/* Only used in br_forward.c */ ++static inline ++void nf_bridge_maybe_copy_header(struct sk_buff *skb) ++{ ++ if (skb->nf_bridge) { ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ memcpy(skb->data - 18, skb->nf_bridge->data, 18); ++ skb_push(skb, 4); ++ } else ++ memcpy(skb->data - 16, skb->nf_bridge->data, 16); ++ } ++} ++ ++static inline ++void nf_bridge_save_header(struct sk_buff *skb) ++{ ++ int header_size = 16; ++ ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) ++ header_size = 18; ++ memcpy(skb->nf_bridge->data, skb->data - header_size, header_size); ++} + ++struct bridge_skb_cb { ++ union { ++ __u32 ipv4; ++ } daddr; ++}; ++#endif /* CONFIG_NETFILTER */ + ++#endif /* __KERNEL__ */ + #endif +--- linux-2.4.29/include/linux/netfilter_ipv4/ip_tables.h 2004-08-08 01:26:06.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv4/ip_tables.h 2005-03-14 21:24:28.000000000 +0100 +@@ -159,7 +159,7 @@ struct ipt_entry + #define IPT_CONTINUE 0xFFFFFFFF + + /* For standard target */ +-#define IPT_RETURN (-NF_MAX_VERDICT - 1) ++#define IPT_RETURN (-NF_REPEAT - 1) + + /* TCP matching stuff */ + struct ipt_tcp +--- linux-2.4.29/include/linux/netfilter_ipv6/ip6_tables.h 2004-08-08 01:26:06.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv6/ip6_tables.h 2005-03-14 00:00:29.000000000 +0100 +@@ -167,7 +167,7 @@ struct ip6t_entry + #define IP6T_CONTINUE 0xFFFFFFFF + + /* For standard target */ +-#define IP6T_RETURN (-NF_MAX_VERDICT - 1) ++#define IP6T_RETURN (-NF_REPEAT - 1) + + /* TCP matching stuff */ + struct ip6t_tcp +--- linux-2.4.29/include/linux/netfilter_arp/arp_tables.h 2003-08-25 13:44:44.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_arp/arp_tables.h 2005-03-14 21:24:31.000000000 +0100 +@@ -154,7 +154,7 @@ struct arpt_entry + #define ARPT_CONTINUE 0xFFFFFFFF + + /* For standard target */ +-#define ARPT_RETURN (-NF_MAX_VERDICT - 1) ++#define ARPT_RETURN (-NF_REPEAT - 1) + + /* The argument to ARPT_SO_GET_INFO */ + struct arpt_getinfo +--- linux-2.4.29/net/Makefile 2004-08-08 01:26:06.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/net/Makefile 2005-03-14 00:00:29.000000000 +0100 +@@ -7,7 +7,8 @@ + + O_TARGET := network.o + +-mod-subdirs := ipv4/netfilter ipv6/netfilter ipx irda bluetooth atm netlink sched core sctp 802 ++mod-subdirs := ipv4/netfilter ipv6/netfilter bridge/netfilter ipx irda \ ++ bluetooth atm netlink sched core sctp 802 + export-objs := netsyms.o + + subdir-y := core ethernet +@@ -27,6 +28,12 @@ subdir-$(CONFIG_NETFILTER) += ipv6/netfi + 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-2.4.29/net/Config.in 2005-01-19 15:10:13.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/Config.in 2005-03-14 00:00:29.000000000 +0100 +@@ -70,6 +70,9 @@ if [ "$CONFIG_DECNET" != "n" ]; then + 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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/Makefile 2005-03-14 00:00:29.000000000 +0100 +@@ -0,0 +1,34 @@ ++# ++# 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-$(CONFIG_BRIDGE_EBT_802_3) += ebt_802_3.o ++obj-$(CONFIG_BRIDGE_EBT_ARPF) += ebt_arp.o ++obj-$(CONFIG_BRIDGE_EBT_AMONG) += ebt_among.o ++obj-$(CONFIG_BRIDGE_EBT_IPF) += ebt_ip.o ++obj-$(CONFIG_BRIDGE_EBT_LIMIT) += ebt_limit.o ++obj-$(CONFIG_BRIDGE_EBT_MARKF) += ebt_mark_m.o ++obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_pkttype.o ++obj-$(CONFIG_BRIDGE_EBT_STP) += ebt_stp.o ++obj-$(CONFIG_BRIDGE_EBT_VLANF) += ebt_vlan.o ++obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_log.o ++obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_ulog.o ++obj-$(CONFIG_BRIDGE_EBT_ARPREPLY) += ebt_arpreply.o ++obj-$(CONFIG_BRIDGE_EBT_DNAT) += ebt_dnat.o ++obj-$(CONFIG_BRIDGE_EBT_MARK_T) += ebt_mark.o ++obj-$(CONFIG_BRIDGE_EBT_REDIRECT) += ebt_redirect.o ++obj-$(CONFIG_BRIDGE_EBT_SNAT) += ebt_snat.o ++include $(TOPDIR)/Rules.make +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/Config.in 2005-03-14 00:00:29.000000000 +0100 +@@ -0,0 +1,23 @@ ++# ++# 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: ulog 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: among filter support' CONFIG_BRIDGE_EBT_AMONG $CONFIG_BRIDGE_NF_EBTABLES ++dep_tristate ' ebt: limit filter support' CONFIG_BRIDGE_EBT_LIMIT $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: arp reply target support' CONFIG_BRIDGE_EBT_ARPREPLY $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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebtable_filter.c 2005-03-14 00:00:29.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebtable_nat.c 2005-03-14 00:00:29.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebtable_broute.c 2005-03-14 00:00:29.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_among.c 2005-03-14 00:00:29.000000000 +0100 +@@ -0,0 +1,223 @@ ++/* ++ * ebt_among ++ * ++ * Authors: ++ * Grzegorz Borowiak <grzes@gnu.univ.gda.pl> ++ * ++ * August, 2003 ++ * ++ */ ++ ++#include <linux/netfilter_bridge/ebtables.h> ++#include <linux/netfilter_bridge/ebt_among.h> ++#include <linux/ip.h> ++#include <linux/if_arp.h> ++#include <linux/module.h> ++ ++static int ebt_mac_wormhash_contains(const struct ebt_mac_wormhash *wh, ++ const char *mac, uint32_t ip) ++{ ++ /* You may be puzzled as to how this code works. ++ * Some tricks were used, refer to ++ * include/linux/netfilter_bridge/ebt_among.h ++ * as there you can find a solution of this mystery. ++ */ ++ const struct ebt_mac_wormhash_tuple *p; ++ int start, limit, i; ++ uint32_t cmp[2] = { 0, 0 }; ++ int key = (const unsigned char) mac[5]; ++ ++ memcpy(((char *) cmp) + 2, mac, 6); ++ start = wh->table[key]; ++ limit = wh->table[key + 1]; ++ if (ip) { ++ for (i = start; i < limit; i++) { ++ p = &wh->pool[i]; ++ if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) { ++ if (p->ip == 0 || p->ip == ip) { ++ return 1; ++ } ++ } ++ } ++ } else { ++ for (i = start; i < limit; i++) { ++ p = &wh->pool[i]; ++ if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) { ++ if (p->ip == 0) { ++ return 1; ++ } ++ } ++ } ++ } ++ return 0; ++} ++ ++static int ebt_mac_wormhash_check_integrity(const struct ebt_mac_wormhash ++ *wh) ++{ ++ int i; ++ ++ for (i = 0; i < 256; i++) { ++ if (wh->table[i] > wh->table[i + 1]) ++ return -0x100 - i; ++ if (wh->table[i] < 0) ++ return -0x200 - i; ++ if (wh->table[i] > wh->poolsize) ++ return -0x300 - i; ++ } ++ if (wh->table[256] > wh->poolsize) ++ return -0xc00; ++ return 0; ++} ++ ++static int get_ip_dst(const struct sk_buff *skb, uint32_t * addr) ++{ ++ if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_IP)) ++ *addr = skb->nh.iph->daddr; ++ else if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) { ++ uint32_t arp_len = sizeof(struct arphdr) + ++ (2 * (((*skb).nh.arph)->ar_hln)) + ++ (2 * (((*skb).nh.arph)->ar_pln)); ++ ++ /* Make sure the packet is long enough. */ ++ if ((((*skb).nh.raw) + arp_len) > (*skb).tail) ++ return -1; ++ /* IPv4 addresses are always 4 bytes. */ ++ if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t)) ++ return -1; ++ ++ memcpy(addr, ((*skb).nh.raw) + sizeof(struct arphdr) + ++ (2 * (((*skb).nh.arph)->ar_hln)) + ++ (((*skb).nh.arph)->ar_pln), sizeof(uint32_t)); ++ ++ } ++ return 0; ++} ++ ++static int get_ip_src(const struct sk_buff *skb, uint32_t * addr) ++{ ++ if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_IP)) ++ *addr = skb->nh.iph->saddr; ++ else if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) { ++ uint32_t arp_len = sizeof(struct arphdr) + ++ (2 * (((*skb).nh.arph)->ar_hln)) + ++ (2 * (((*skb).nh.arph)->ar_pln)); ++ ++ /* Make sure the packet is long enough. */ ++ if ((((*skb).nh.raw) + arp_len) > (*skb).tail) ++ return -1; ++ /* IPv4 addresses are always 4 bytes. */ ++ if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t)) ++ return -1; ++ ++ memcpy(addr, ((*skb).nh.raw) + sizeof(struct arphdr) + ++ ((((*skb).nh.arph)->ar_hln)), sizeof(uint32_t)); ++ ++ } ++ return 0; ++} ++ ++static int ebt_filter_among(const struct sk_buff *skb, ++ const struct net_device *in, ++ const struct net_device *out, const void *data, ++ unsigned int datalen) ++{ ++ struct ebt_among_info *info = (struct ebt_among_info *) data; ++ const char *dmac, *smac; ++ const struct ebt_mac_wormhash *wh_dst, *wh_src; ++ uint32_t dip = 0, sip = 0; ++ ++ wh_dst = ebt_among_wh_dst(info); ++ wh_src = ebt_among_wh_src(info); ++ ++ if (wh_src) { ++ smac = skb->mac.ethernet->h_source; ++ if (get_ip_src(skb, &sip)) ++ return EBT_NOMATCH; ++ if (!(info->bitmask & EBT_AMONG_SRC_NEG)) { ++ /* we match only if it contains */ ++ if (!ebt_mac_wormhash_contains(wh_src, smac, sip)) ++ return EBT_NOMATCH; ++ } else { ++ /* we match only if it DOES NOT contain */ ++ if (ebt_mac_wormhash_contains(wh_src, smac, sip)) ++ return EBT_NOMATCH; ++ } ++ } ++ ++ if (wh_dst) { ++ dmac = skb->mac.ethernet->h_dest; ++ if (get_ip_dst(skb, &dip)) ++ return EBT_NOMATCH; ++ if (!(info->bitmask & EBT_AMONG_DST_NEG)) { ++ /* we match only if it contains */ ++ if (!ebt_mac_wormhash_contains(wh_dst, dmac, dip)) ++ return EBT_NOMATCH; ++ } else { ++ /* we match only if it DOES NOT contain */ ++ if (ebt_mac_wormhash_contains(wh_dst, dmac, dip)) ++ return EBT_NOMATCH; ++ } ++ } ++ ++ return EBT_MATCH; ++} ++ ++static int ebt_among_check(const char *tablename, unsigned int hookmask, ++ const struct ebt_entry *e, void *data, ++ unsigned int datalen) ++{ ++ struct ebt_among_info *info = (struct ebt_among_info *) data; ++ int expected_length = sizeof(struct ebt_among_info); ++ const struct ebt_mac_wormhash *wh_dst, *wh_src; ++ int err; ++ ++ wh_dst = ebt_among_wh_dst(info); ++ wh_src = ebt_among_wh_src(info); ++ expected_length += ebt_mac_wormhash_size(wh_dst); ++ expected_length += ebt_mac_wormhash_size(wh_src); ++ ++ if (datalen != EBT_ALIGN(expected_length)) { ++ printk(KERN_WARNING ++ "ebtables: among: wrong size: %d" ++ "against expected %d, rounded to %d\n", ++ datalen, expected_length, ++ EBT_ALIGN(expected_length)); ++ return -EINVAL; ++ } ++ if (wh_dst && (err = ebt_mac_wormhash_check_integrity(wh_dst))) { ++ printk(KERN_WARNING ++ "ebtables: among: dst integrity fail: %x\n", -err); ++ return -EINVAL; ++ } ++ if (wh_src && (err = ebt_mac_wormhash_check_integrity(wh_src))) { ++ printk(KERN_WARNING ++ "ebtables: among: src integrity fail: %x\n", -err); ++ return -EINVAL; ++ } ++ return 0; ++} ++ ++static struct ebt_match filter_among = { ++ {NULL, NULL}, ++ EBT_AMONG_MATCH, ++ ebt_filter_among, ++ ebt_among_check, ++ NULL, ++ THIS_MODULE ++}; ++ ++static int __init init(void) ++{ ++ return ebt_register_match(&filter_among); ++} ++ ++static void __exit fini(void) ++{ ++ ebt_unregister_match(&filter_among); ++} ++ ++module_init(init); ++module_exit(fini); ++EXPORT_NO_SYMBOLS; ++MODULE_LICENSE("GPL"); +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_limit.c 2005-03-14 00:00:29.000000000 +0100 +@@ -0,0 +1,101 @@ ++/* ++ * ebt_limit ++ * ++ * Authors: ++ * Tom Marshall <tommy@home.tig-grr.com> ++ * ++ * Mostly copied from netfilter's ipt_limit.c, see that file for explanation ++ * ++ * September, 2003 ++ * ++ */ ++ ++#include <linux/netfilter_bridge/ebtables.h> ++#include <linux/netfilter_bridge/ebt_limit.h> ++#include <linux/module.h> ++ ++#include <linux/netdevice.h> ++#include <linux/spinlock.h> ++ ++static spinlock_t limit_lock = SPIN_LOCK_UNLOCKED; ++ ++#define CREDITS_PER_JIFFY 128 ++ ++static int ebt_limit_match(const struct sk_buff *skb, const struct net_device *in, ++ const struct net_device *out, const void *data, unsigned int datalen) ++{ ++ struct ebt_limit_info *info = (struct ebt_limit_info *)data; ++ unsigned long now = jiffies; ++ ++ spin_lock_bh(&limit_lock); ++ info->credit += (now - xchg(&info->prev, now)) * CREDITS_PER_JIFFY; ++ if (info->credit > info->credit_cap) ++ info->credit = info->credit_cap; ++ ++ if (info->credit >= info->cost) { ++ /* We're not limited. */ ++ info->credit -= info->cost; ++ spin_unlock_bh(&limit_lock); ++ return EBT_MATCH; ++ } ++ ++ spin_unlock_bh(&limit_lock); ++ return EBT_NOMATCH; ++} ++ ++/* Precision saver. */ ++static u_int32_t ++user2credits(u_int32_t user) ++{ ++ /* If multiplying would overflow... */ ++ if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY)) ++ /* Divide first. */ ++ return (user / EBT_LIMIT_SCALE) * HZ * CREDITS_PER_JIFFY; ++ ++ return (user * HZ * CREDITS_PER_JIFFY) / EBT_LIMIT_SCALE; ++} ++ ++static int ebt_limit_check(const char *tablename, unsigned int hookmask, ++ const struct ebt_entry *e, void *data, unsigned int datalen) ++{ ++ struct ebt_limit_info *info = (struct ebt_limit_info *)data; ++ ++ if (datalen != EBT_ALIGN(sizeof(struct ebt_limit_info))) ++ return -EINVAL; ++ ++ /* Check for overflow. */ ++ if (info->burst == 0 ++ || user2credits(info->avg * info->burst) < user2credits(info->avg)) { ++ printk("Overflow in ebt_limit: %u/%u\n", ++ info->avg, info->burst); ++ return -EINVAL; ++ } ++ ++ /* User avg in seconds * EBT_LIMIT_SCALE: convert to jiffies * 128. */ ++ info->prev = jiffies; ++ info->credit = user2credits(info->avg * info->burst); ++ info->credit_cap = user2credits(info->avg * info->burst); ++ info->cost = user2credits(info->avg); ++ return 0; ++} ++ ++static struct ebt_match ebt_limit_reg = ++{ ++ {NULL, NULL}, EBT_LIMIT_MATCH, ebt_limit_match, ebt_limit_check, NULL, ++ THIS_MODULE ++}; ++ ++static int __init init(void) ++{ ++ return ebt_register_match(&ebt_limit_reg); ++} ++ ++static void __exit fini(void) ++{ ++ ebt_unregister_match(&ebt_limit_reg); ++} ++ ++module_init(init); ++module_exit(fini); ++EXPORT_NO_SYMBOLS; ++MODULE_LICENSE("GPL"); +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_arpreply.c 2005-03-14 00:00:30.000000000 +0100 +@@ -0,0 +1,86 @@ ++/* ++ * ebt_arpreply ++ * ++ * Authors: ++ * Grzegorz Borowiak <grzes@gnu.univ.gda.pl> ++ * Bart De Schuymer <bdschuym@pandora.be> ++ * ++ * August, 2003 ++ * ++ */ ++ ++#include <linux/netfilter_bridge/ebtables.h> ++#include <linux/netfilter_bridge/ebt_arpreply.h> ++#include <linux/if_arp.h> ++#include <net/arp.h> ++#include <linux/module.h> ++ ++static int ebt_target_reply(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_arpreply_info *info = (struct ebt_arpreply_info *)data; ++ struct arphdr *ah; ++ unsigned char *sha, *arp_ptr; ++ u32 sip, tip; ++ ++ ah = (**pskb).nh.arph; ++ if (ah->ar_op != __constant_htons(ARPOP_REQUEST) || ++ ah->ar_hln != ETH_ALEN || ah->ar_pro != htons(ETH_P_IP) || ++ ah->ar_pln != 4) ++ return EBT_CONTINUE; ++ ++ arp_ptr = (unsigned char *)(ah + 1); ++ ++ /* get source and target IP */ ++ sha = arp_ptr; ++ arp_ptr += ETH_ALEN; ++ memcpy(&sip, arp_ptr, 4); ++ arp_ptr += 4 + ETH_ALEN; ++ memcpy(&tip, arp_ptr, 4); ++ ++ arp_send(ARPOP_REPLY, ETH_P_ARP, sip, in, tip, sha, info->mac, sha); ++ ++ return info->target; ++} ++ ++static int ebt_target_reply_check(const char *tablename, unsigned int hookmask, ++ const struct ebt_entry *e, void *data, unsigned int datalen) ++{ ++ struct ebt_arpreply_info *info = (struct ebt_arpreply_info *)data; ++ ++ if (datalen != EBT_ALIGN(sizeof(struct ebt_arpreply_info))) ++ return -EINVAL; ++ if (BASE_CHAIN && info->target == EBT_RETURN) ++ return -EINVAL; ++ if (e->ethproto != __constant_htons(ETH_P_ARP) || ++ e->invflags & EBT_IPROTO) ++ return -EINVAL; ++ CLEAR_BASE_CHAIN_BIT; ++ if (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) ++ return -EINVAL; ++ return 0; ++} ++ ++static struct ebt_target reply_target = ++{ ++ .name = EBT_ARPREPLY_TARGET, ++ .target = ebt_target_reply, ++ .check = ebt_target_reply_check, ++ .me = THIS_MODULE, ++}; ++ ++static int __init init(void) ++{ ++ return ebt_register_target(&reply_target); ++} ++ ++static void __exit fini(void) ++{ ++ ebt_unregister_target(&reply_target); ++} ++ ++module_init(init); ++module_exit(fini); ++EXPORT_NO_SYMBOLS; ++MODULE_LICENSE("GPL"); +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_802_3.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_mark.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_mark_m.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_pkttype.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_stp.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_redirect.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_arp.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_ip.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_vlan.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_log.c 2005-03-14 00:00:30.000000000 +0100 +@@ -0,0 +1,153 @@ ++/* ++ * 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, unsigned int hooknr, ++ 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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_ulog.c 2005-03-14 00:00:30.000000000 +0100 +@@ -0,0 +1,281 @@ ++/* ++ * netfilter module for userspace bridged Ethernet frames logging daemons ++ * ++ * Authors: ++ * Bart De Schuymer <bdschuym@pandora.be> ++ * ++ * November, 2004 ++ * ++ * Based on ipt_ULOG.c, which is ++ * (C) 2000-2002 by Harald Welte <laforge@netfilter.org> ++ * ++ * This module accepts two parameters: ++ * ++ * nlbufsiz: ++ * The parameter specifies how big the buffer for each netlink multicast ++ * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will ++ * get accumulated in the kernel until they are sent to userspace. It is ++ * NOT possible to allocate more than 128kB, and it is strongly discouraged, ++ * because atomically allocating 128kB inside the network rx softirq is not ++ * reliable. Please also keep in mind that this buffer size is allocated for ++ * each nlgroup you are using, so the total kernel memory usage increases ++ * by that factor. ++ * ++ * flushtimeout: ++ * Specify, after how many hundredths of a second the queue should be ++ * flushed even if it is not full yet. ++ * ++ */ ++ ++#include <linux/module.h> ++#include <linux/config.h> ++#include <linux/spinlock.h> ++#include <linux/socket.h> ++#include <linux/skbuff.h> ++#include <linux/kernel.h> ++#include <linux/timer.h> ++#include <linux/netlink.h> ++#include <linux/netdevice.h> ++#include <linux/module.h> ++#include <linux/netfilter_bridge/ebtables.h> ++#include <linux/netfilter_bridge/ebt_ulog.h> ++#include <net/sock.h> ++#include "../br_private.h" ++ ++#define PRINTR(format, args...) do { if (net_ratelimit()) \ ++ printk(format , ## args); } while (0) ++ ++static unsigned int nlbufsiz = 4096; ++MODULE_PARM(nlbufsiz, "i"); ++MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) " ++ "(defaults to 4096)"); ++ ++static unsigned int flushtimeout = 10; ++MODULE_PARM(flushtimeout, "i"); ++MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths of a second) " ++ "(defaults to 10)"); ++ ++typedef struct { ++ unsigned int qlen; /* number of nlmsgs' in the skb */ ++ struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ ++ struct sk_buff *skb; /* the pre-allocated skb */ ++ struct timer_list timer; /* the timer function */ ++ spinlock_t lock; /* the per-queue lock */ ++} ebt_ulog_buff_t; ++ ++static ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS]; ++static struct sock *ebtlognl; ++ ++/* send one ulog_buff_t to userspace */ ++static void ulog_send(unsigned int nlgroup) ++{ ++ ebt_ulog_buff_t *ub = &ulog_buffers[nlgroup]; ++ ++ if (timer_pending(&ub->timer)) ++ del_timer(&ub->timer); ++ ++ /* last nlmsg needs NLMSG_DONE */ ++ if (ub->qlen > 1) ++ ub->lastnlh->nlmsg_type = NLMSG_DONE; ++ ++ NETLINK_CB(ub->skb).dst_groups = 1 << nlgroup; ++ netlink_broadcast(ebtlognl, ub->skb, 0, 1 << nlgroup, GFP_ATOMIC); ++ ++ ub->qlen = 0; ++ ub->skb = NULL; ++} ++ ++/* timer function to flush queue in flushtimeout time */ ++static void ulog_timer(unsigned long data) ++{ ++ spin_lock_bh(&ulog_buffers[data].lock); ++ if (ulog_buffers[data].skb) ++ ulog_send(data); ++ spin_unlock_bh(&ulog_buffers[data].lock); ++} ++ ++static struct sk_buff *ulog_alloc_skb(unsigned int size) ++{ ++ struct sk_buff *skb; ++ ++ skb = alloc_skb(nlbufsiz, GFP_ATOMIC); ++ if (!skb) { ++ PRINTR(KERN_ERR "ebt_ulog: can't alloc whole buffer " ++ "of size %ub!\n", nlbufsiz); ++ if (size < nlbufsiz) { ++ /* try to allocate only as much as we need for ++ * current packet */ ++ skb = alloc_skb(size, GFP_ATOMIC); ++ if (!skb) ++ PRINTR(KERN_ERR "ebt_ulog: can't even allocate " ++ "buffer of size %ub\n", size); ++ } ++ } ++ ++ return skb; ++} ++ ++static void ebt_ulog(const struct sk_buff *skb, unsigned int hooknr, ++ const struct net_device *in, const struct net_device *out, ++ const void *data, unsigned int datalen) ++{ ++ ebt_ulog_packet_msg_t *pm; ++ size_t size, copy_len; ++ struct nlmsghdr *nlh; ++ struct ebt_ulog_info *loginfo = (struct ebt_ulog_info *)data; ++ unsigned int group = loginfo->nlgroup; ++ ebt_ulog_buff_t *ub = &ulog_buffers[group]; ++ spinlock_t *lock = &ub->lock; ++ ++ if ((loginfo->cprange == 0) || ++ (loginfo->cprange > skb->len + ETH_HLEN)) ++ copy_len = skb->len + ETH_HLEN; ++ else ++ copy_len = loginfo->cprange; ++ ++ size = NLMSG_SPACE(sizeof(*pm) + copy_len); ++ ++ spin_lock_bh(lock); ++ ++ if (!ub->skb) { ++ if (!(ub->skb = ulog_alloc_skb(size))) ++ goto alloc_failure; ++ } else if (size > skb_tailroom(ub->skb)) { ++ ulog_send(group); ++ ++ if (!(ub->skb = ulog_alloc_skb(size))) ++ goto alloc_failure; ++ } ++ ++ nlh = NLMSG_PUT(ub->skb, 0, ub->qlen, 0, ++ size - NLMSG_ALIGN(sizeof(*nlh))); ++ ub->qlen++; ++ ++ pm = NLMSG_DATA(nlh); ++ ++ /* Fill in the ulog data */ ++ do_gettimeofday(&pm->stamp); ++ if (ub->qlen == 1) ++ ub->skb->stamp = pm->stamp; ++ pm->data_len = copy_len; ++ pm->mark = skb->nfmark; ++ pm->hook = hooknr; ++ if (loginfo->prefix != NULL) ++ strcpy(pm->prefix, loginfo->prefix); ++ else ++ *(pm->prefix) = '\0'; ++ ++ if (in) { ++ strcpy(pm->physindev, in->name); ++ strcpy(pm->indev, in->br_port->br->dev.name); ++ } else ++ pm->indev[0] = pm->physindev[0] = '\0'; ++ ++ if (out) { ++ strcpy(pm->physoutdev, out->name); ++ strcpy(pm->outdev, out->br_port->br->dev.name); ++ } else ++ pm->outdev[0] = pm->physoutdev[0] = '\0'; ++ ++ if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0) ++ BUG(); ++ ++ if (ub->qlen > 1) ++ ub->lastnlh->nlmsg_flags |= NLM_F_MULTI; ++ ++ ub->lastnlh = nlh; ++ ++ if (ub->qlen >= loginfo->qthreshold) ++ ulog_send(group); ++ else if (!timer_pending(&ub->timer)) { ++ ub->timer.expires = jiffies + flushtimeout * HZ / 100; ++ add_timer(&ub->timer); ++ } ++ ++unlock: ++ spin_unlock_bh(lock); ++ ++ return; ++ ++nlmsg_failure: ++ PRINTR(KERN_ERR "ebt_ULOG: error during NLMSG_PUT.\n"); ++ goto unlock; ++alloc_failure: ++ goto unlock; ++} ++ ++static int ebt_ulog_check(const char *tablename, unsigned int hookmask, ++ const struct ebt_entry *e, void *data, unsigned int datalen) ++{ ++ struct ebt_ulog_info *loginfo = (struct ebt_ulog_info *)data; ++ ++ if (datalen != EBT_ALIGN(sizeof(struct ebt_ulog_info)) || ++ loginfo->nlgroup > 31) ++ return -EINVAL; ++ ++ loginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0'; ++ ++ if (loginfo->qthreshold > EBT_ULOG_MAX_QLEN) ++ loginfo->qthreshold = EBT_ULOG_MAX_QLEN; ++ ++ return 0; ++} ++ ++static struct ebt_watcher ulog = { ++ {NULL, NULL}, EBT_ULOG_WATCHER, ebt_ulog, ebt_ulog_check, NULL, ++ THIS_MODULE ++}; ++ ++static int __init init(void) ++{ ++ int i, ret = 0; ++ ++ if (nlbufsiz >= 128*1024) { ++ printk(KERN_NOTICE "ebt_ulog: Netlink buffer has to be <= 128kB," ++ " please try a smaller nlbufsiz parameter.\n"); ++ return -EINVAL; ++ } ++ ++ /* initialize ulog_buffers */ ++ for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) { ++ init_timer(&ulog_buffers[i].timer); ++ ulog_buffers[i].timer.function = ulog_timer; ++ ulog_buffers[i].timer.data = i; ++ ulog_buffers[i].lock = SPIN_LOCK_UNLOCKED; ++ } ++ ++ ebtlognl = netlink_kernel_create(NETLINK_NFLOG, NULL); ++ if (!ebtlognl) ++ ret = -ENOMEM; ++ else if ((ret = ebt_register_watcher(&ulog))) ++ sock_release(ebtlognl->socket); ++ ++ return ret; ++} ++ ++static void __exit fini(void) ++{ ++ ebt_ulog_buff_t *ub; ++ int i; ++ ++ ebt_unregister_watcher(&ulog); ++ for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) { ++ ub = &ulog_buffers[i]; ++ if (timer_pending(&ub->timer)) ++ del_timer(&ub->timer); ++ spin_lock_bh(&ub->lock); ++ if (ub->skb) { ++ kfree_skb(ub->skb); ++ ub->skb = NULL; ++ } ++ spin_unlock_bh(&ub->lock); ++ } ++ sock_release(ebtlognl->socket); ++} ++ ++module_init(init); ++module_exit(fini); ++MODULE_LICENSE("GPL"); ++MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); ++MODULE_DESCRIPTION("ebtables userspace logging module for bridged Ethernet" ++ " frames"); +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_snat.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_dnat.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebtables.c 2005-03-14 21:04:05.155913576 +0100 +@@ -0,0 +1,1497 @@ ++/* ++ * 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, unsigned int hooknr, const struct net_device *in, ++ const struct net_device *out) ++{ ++ w->u.watcher->watcher(skb, hooknr, 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) ++{ ++ int i = 0; ++ char *devname = device->name; ++ ++ if (*entry == '\0') ++ return 0; ++ if (!device) ++ return 1; ++ /* 1 is the wildcard token */ ++ while (entry[i] != '\0' && entry[i] != 1 && entry[i] == devname[i]) ++ i++; ++ return (devname[i] != entry[i] && entry[i] != 1); ++} ++ ++#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; ++ ++ read_lock_bh(&table->lock); ++ private = table->private; ++ 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, hook, 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=mc): ++ // - the nr of entries in each chain is right ++ // - the size of the allocated space is right ++ // - all valid hooks have a corresponding chain ++ // - there are no loops ++ // - wrong data can still be on the level of a single entry ++ // - could be there are jumps to places that are not the ++ // beginning of a chain. This can only occur in chains that ++ // are not accessible from any base chains, so we don't care. ++ ++ // 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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebtables.h 2005-03-14 21:24:12.000000000 +0100 +@@ -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_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]; ++}; ++ ++// used for the bitmask of struct ebt_entry ++ ++// This is a hack to make a difference between an ebt_entry struct and an ++// ebt_entries struct when traversing the entries from start to end. ++// Using this simplifies the code alot, while still being able to use ++// ebt_entries. ++// Contrary, iptables doesn't use something like ebt_entries and therefore uses ++// different techniques for naming the policy and such. So, iptables doesn't ++// need a hack like this. ++#define EBT_ENTRY_OR_ENTRIES 0x01 ++// these are the normal masks ++#define EBT_NOPROTO 0x02 ++#define EBT_802_3 0x04 ++#define EBT_SOURCEMAC 0x08 ++#define EBT_DESTMAC 0x10 ++#define EBT_F_MASK (EBT_NOPROTO | EBT_802_3 | EBT_SOURCEMAC | EBT_DESTMAC \ ++ | EBT_ENTRY_OR_ENTRIES) ++ ++#define EBT_IPROTO 0x01 ++#define EBT_IIN 0x02 ++#define EBT_IOUT 0x04 ++#define EBT_ISOURCE 0x8 ++#define EBT_IDEST 0x10 ++#define EBT_ILOGICALIN 0x20 ++#define EBT_ILOGICALOUT 0x40 ++#define EBT_INV_MASK (EBT_IPROTO | EBT_IIN | EBT_IOUT | EBT_ILOGICALIN \ ++ | EBT_ILOGICALOUT | EBT_ISOURCE | EBT_IDEST) ++ ++struct ebt_entry_match ++{ ++ union { ++ char name[EBT_FUNCTION_MAXNAMELEN]; ++ struct ebt_match *match; ++ } u; ++ // size of data ++ unsigned int match_size; ++ unsigned char data[0]; ++}; ++ ++struct ebt_entry_watcher ++{ ++ union { ++ char name[EBT_FUNCTION_MAXNAMELEN]; ++ struct ebt_watcher *watcher; ++ } u; ++ // size of data ++ unsigned int watcher_size; ++ unsigned char data[0]; ++}; ++ ++struct ebt_entry_target ++{ ++ union { ++ char name[EBT_FUNCTION_MAXNAMELEN]; ++ struct ebt_target *target; ++ } u; ++ // size of data ++ unsigned int target_size; ++ unsigned char data[0]; ++}; ++ ++#define EBT_STANDARD_TARGET "standard" ++struct ebt_standard_target ++{ ++ struct ebt_entry_target target; ++ int verdict; ++}; ++ ++// one entry ++struct ebt_entry { ++ // this needs to be the first field ++ 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]; ++}; ++ ++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; ++}; ++ ++// [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, unsigned int hooknr, ++ 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_entry_target)-1)) & \ ++ ~(__alignof__(struct ebt_entry_target)-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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_among.h 2005-03-14 00:00:30.000000000 +0100 +@@ -0,0 +1,65 @@ ++#ifndef __LINUX_BRIDGE_EBT_AMONG_H ++#define __LINUX_BRIDGE_EBT_AMONG_H ++ ++#define EBT_AMONG_DST 0x01 ++#define EBT_AMONG_SRC 0x02 ++ ++/* Grzegorz Borowiak <grzes@gnu.univ.gda.pl> 2003 ++ * ++ * Write-once-read-many hash table, used for checking if a given ++ * MAC address belongs to a set or not and possibly for checking ++ * if it is related with a given IPv4 address. ++ * ++ * The hash value of an address is its last byte. ++ * ++ * In real-world ethernet addresses, values of the last byte are ++ * evenly distributed and there is no need to consider other bytes. ++ * It would only slow the routines down. ++ * ++ * For MAC address comparison speedup reasons, we introduce a trick. ++ * MAC address is mapped onto an array of two 32-bit integers. ++ * This pair of integers is compared with MAC addresses in the ++ * hash table, which are stored also in form of pairs of integers ++ * (in `cmp' array). This is quick as it requires only two elementary ++ * number comparisons in worst case. Further, we take advantage of ++ * fact that entropy of 3 last bytes of address is larger than entropy ++ * of 3 first bytes. So first we compare 4 last bytes of addresses and ++ * if they are the same we compare 2 first. ++ * ++ * Yes, it is a memory overhead, but in 2003 AD, who cares? ++ */ ++ ++struct ebt_mac_wormhash_tuple ++{ ++ uint32_t cmp[2]; ++ uint32_t ip; ++}; ++ ++struct ebt_mac_wormhash ++{ ++ int table[257]; ++ int poolsize; ++ struct ebt_mac_wormhash_tuple pool[0]; ++}; ++ ++#define ebt_mac_wormhash_size(x) ((x) ? sizeof(struct ebt_mac_wormhash) \ ++ + (x)->poolsize * sizeof(struct ebt_mac_wormhash_tuple) : 0) ++ ++struct ebt_among_info ++{ ++ int wh_dst_ofs; ++ int wh_src_ofs; ++ int bitmask; ++}; ++ ++#define EBT_AMONG_DST_NEG 0x1 ++#define EBT_AMONG_SRC_NEG 0x2 ++ ++#define ebt_among_wh_dst(x) ((x)->wh_dst_ofs ? \ ++ (struct ebt_mac_wormhash*)((char*)(x) + (x)->wh_dst_ofs) : NULL) ++#define ebt_among_wh_src(x) ((x)->wh_src_ofs ? \ ++ (struct ebt_mac_wormhash*)((char*)(x) + (x)->wh_src_ofs) : NULL) ++ ++#define EBT_AMONG_MATCH "among" ++ ++#endif +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_limit.h 2005-03-14 00:00:30.000000000 +0100 +@@ -0,0 +1,23 @@ ++#ifndef __LINUX_BRIDGE_EBT_LIMIT_H ++#define __LINUX_BRIDGE_EBT_LIMIT_H ++ ++#define EBT_LIMIT_MATCH "limit" ++ ++/* timings are in milliseconds. */ ++#define EBT_LIMIT_SCALE 10000 ++ ++/* 1/10,000 sec period => max of 10,000/sec. Min rate is then 429490 ++ seconds, or one every 59 hours. */ ++ ++struct ebt_limit_info ++{ ++ u_int32_t avg; /* Average secs between packets * scale */ ++ u_int32_t burst; /* Period multiplier for upper limit. */ ++ ++ /* Used internally by the kernel */ ++ unsigned long prev; ++ u_int32_t credit; ++ u_int32_t credit_cap, cost; ++}; ++ ++#endif +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_arpreply.h 2005-03-14 00:00:30.000000000 +0100 +@@ -0,0 +1,11 @@ ++#ifndef __LINUX_BRIDGE_EBT_ARPREPLY_H ++#define __LINUX_BRIDGE_EBT_ARPREPLY_H ++ ++struct ebt_arpreply_info ++{ ++ unsigned char mac[ETH_ALEN]; ++ int target; ++}; ++#define EBT_ARPREPLY_TARGET "arpreply" ++ ++#endif +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_802_3.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_arp.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_ip.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_pkttype.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_stp.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_vlan.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_log.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_ulog.h 2005-03-14 00:00:30.000000000 +0100 +@@ -0,0 +1,33 @@ ++#ifndef _EBT_ULOG_H ++#define _EBT_ULOG_H ++ ++#define EBT_ULOG_DEFAULT_NLGROUP 0 ++#define EBT_ULOG_DEFAULT_QTHRESHOLD 1 ++#define EBT_ULOG_MAXNLGROUPS 32 /* hardcoded netlink max */ ++#define EBT_ULOG_PREFIX_LEN 32 ++#define EBT_ULOG_MAX_QLEN 50 ++#define EBT_ULOG_WATCHER "ulog" ++ ++struct ebt_ulog_info { ++ uint32_t nlgroup; ++ unsigned int cprange; ++ unsigned int qthreshold; ++ char prefix[EBT_ULOG_PREFIX_LEN]; ++}; ++ ++typedef struct ebt_ulog_packet_msg { ++ char indev[IFNAMSIZ]; ++ char outdev[IFNAMSIZ]; ++ char physindev[IFNAMSIZ]; ++ char physoutdev[IFNAMSIZ]; ++ char prefix[EBT_ULOG_PREFIX_LEN]; ++ struct timeval stamp; ++ unsigned long mark; ++ unsigned int hook; ++ size_t data_len; ++ /* The complete packet, including Ethernet header and perhaps ++ * the VLAN header is appended */ ++ unsigned char data[0] __attribute__ ((aligned (__alignof__(int)))); ++} ebt_ulog_packet_msg_t; ++ ++#endif /* _EBT_ULOG_H */ +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_nat.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_redirect.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_mark_m.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_mark_t.h 2005-03-14 00:00:30.000000000 +0100 +@@ -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-2.4.29/include/linux/netfilter.h 2005-01-19 15:10:12.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter.h 2005-03-14 21:11:36.000000000 +0100 +@@ -17,7 +17,8 @@ + #define NF_STOLEN 2 + #define NF_QUEUE 3 + #define NF_REPEAT 4 +-#define NF_MAX_VERDICT NF_REPEAT ++#define NF_STOP 5 ++#define NF_MAX_VERDICT NF_STOP + + /* Generic cache responses from hook functions. + <= 0x2000 is used for protocol-flags. */ +@@ -118,17 +119,34 @@ extern struct list_head nf_hooks[NPROTO] + /* 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) \ ++({int __ret; \ ++if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \ ++ __ret = (okfn)(skb); \ ++__ret;}) ++#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \ ++({int __ret; \ ++if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1) \ ++ __ret = (okfn)(skb); \ ++__ret;}) + #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))) ++#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \ ++({int __ret; \ ++if (list_empty(&nf_hooks[pf][hook]) || \ ++ (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \ ++ __ret = (okfn)(skb); \ ++__ret;}) ++#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \ ++({int __ret; \ ++if (list_empty(&nf_hooks[pf][hook]) || \ ++ (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1) \ ++ __ret = (okfn)(skb); \ ++__ret;}) + #endif + +-int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb, ++int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb, + 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, +--- linux-2.4.29/include/linux/netfilter_ipv4.h 2002-02-25 20:38:13.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv4.h 2005-03-14 21:11:36.000000000 +0100 +@@ -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-2.4.29/include/linux/netfilter_ipv6.h 2001-01-02 01:17:54.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv6.h 2005-03-14 21:24:11.000000000 +0100 +@@ -57,8 +57,10 @@ + enum nf_ip6_hook_priorities { + NF_IP6_PRI_FIRST = INT_MIN, + NF_IP6_PRI_CONNTRACK = -200, ++ NF_IP6_PRI_BRIDGE_SABOTAGE_FORWARD = -175, + NF_IP6_PRI_MANGLE = -150, + NF_IP6_PRI_NAT_DST = -100, ++ NF_IP6_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50, + NF_IP6_PRI_FILTER = 0, + NF_IP6_PRI_NAT_SRC = 100, + NF_IP6_PRI_LAST = INT_MAX, +--- linux-2.4.29/include/linux/skbuff.h 2004-08-08 01:26:06.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/include/linux/skbuff.h 2005-03-14 21:07:31.000000000 +0100 +@@ -92,6 +92,20 @@ struct nf_conntrack { + 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; ++#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) ++ struct net_device *netoutdev; ++#endif ++ unsigned int mask; ++ unsigned long data[32 / sizeof(unsigned long)]; ++}; ++#endif ++ + #endif + + struct sk_buff_head { +@@ -208,6 +222,9 @@ struct sk_buff { + #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) +@@ -1175,6 +1192,20 @@ nf_reset(struct sk_buff *skb) + skb->nf_debug = 0; + #endif + } ++ ++#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 ++ + #else /* CONFIG_NETFILTER */ + static inline void nf_reset(struct sk_buff *skb) {} + #endif /* CONFIG_NETFILTER */ +--- linux-2.4.29/net/core/netfilter.c 2005-01-19 15:10:13.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/core/netfilter.c 2005-03-14 21:21:41.825275416 +0100 +@@ -342,32 +342,29 @@ static unsigned int nf_iterate(struct li + 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) + { ++ unsigned int verdict; ++ + for (*i = (*i)->next; *i != head; *i = (*i)->next) { + struct nf_hook_ops *elem = (struct nf_hook_ops *)*i; +- switch (elem->hook(hook, skb, indev, outdev, okfn)) { +- case NF_QUEUE: +- return NF_QUEUE; +- +- case NF_STOLEN: +- return NF_STOLEN; +- +- case NF_DROP: +- return NF_DROP; + +- case NF_REPEAT: +- *i = (*i)->prev; +- break; ++ if (hook_thresh > elem->priority) ++ continue; + ++ verdict = elem->hook(hook, skb, indev, outdev, okfn); ++ if (verdict != NF_ACCEPT) { + #ifdef CONFIG_NETFILTER_DEBUG +- case NF_ACCEPT: +- break; +- +- default: +- NFDEBUG("Evil return from %p(%u).\n", +- elem->hook, hook); ++ if (unlikely(verdict > NF_MAX_VERDICT)) { ++ NFDEBUG("Evil return from %p(%u).\n", ++ elem->hook, hook); ++ continue; ++ } + #endif ++ if (verdict != NF_REPEAT) ++ return verdict; ++ *i = (*i)->prev; + } + } + return NF_ACCEPT; +@@ -413,6 +410,10 @@ static void nf_queue(struct sk_buff *skb + { + 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); +@@ -435,36 +436,52 @@ static void nf_queue(struct sk_buff *skb + 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; + } + } + +-int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb, ++/* Returns 1 if okfn() needs to be executed by the caller, ++ * -EPERM for NF_DROP, 0 otherwise. */ ++int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb, + 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; + int ret = 0; + + /* This stopgap cannot be removed until all the hooks are audited. */ +- if (skb_is_nonlinear(skb) && skb_linearize(skb, GFP_ATOMIC) != 0) { +- kfree_skb(skb); ++ if (skb_is_nonlinear(*pskb) && skb_linearize(*pskb, GFP_ATOMIC) != 0) { ++ kfree_skb(*pskb); + return -ENOMEM; + } +- if (skb->ip_summed == CHECKSUM_HW) { ++ if ((*pskb)->ip_summed == CHECKSUM_HW) { + if (outdev == NULL) { +- skb->ip_summed = CHECKSUM_NONE; ++ (*pskb)->ip_summed = CHECKSUM_NONE; + } else { +- skb_checksum_help(skb); ++ skb_checksum_help(*pskb); + } + } + +@@ -472,30 +489,24 @@ int nf_hook_slow(int pf, unsigned int ho + br_read_lock_bh(BR_NETPROTO_LOCK); + + #ifdef CONFIG_NETFILTER_DEBUG +- if (skb->nf_debug & (1 << hook)) { ++ if (unlikely((*pskb)->nf_debug & (1 << hook))) { + printk("nf_hook: hook %i already set.\n", hook); +- nf_dump_skb(pf, skb); ++ nf_dump_skb(pf, *pskb); + } +- skb->nf_debug |= (1 << hook); ++ (*pskb)->nf_debug |= (1 << hook); + #endif + + elem = &nf_hooks[pf][hook]; +- verdict = nf_iterate(&nf_hooks[pf][hook], &skb, hook, indev, +- outdev, &elem, okfn); +- if (verdict == NF_QUEUE) { +- NFDEBUG("nf_hook: Verdict = QUEUE.\n"); +- nf_queue(skb, elem, pf, hook, indev, outdev, okfn); +- } +- +- switch (verdict) { +- case NF_ACCEPT: +- ret = okfn(skb); +- break; +- +- case NF_DROP: +- kfree_skb(skb); ++ verdict = nf_iterate(&nf_hooks[pf][hook], pskb, hook, indev, ++ outdev, &elem, okfn, hook_thresh); ++ if (verdict == NF_ACCEPT || verdict == NF_STOP) ++ ret = 1; ++ else if (verdict == NF_DROP) { ++ kfree_skb(*pskb); + ret = -EPERM; +- break; ++ } else if (verdict == NF_QUEUE) { ++ NFDEBUG("nf_hook: Verdict = QUEUE.\n"); ++ nf_queue(*pskb, elem, pf, hook, indev, outdev, okfn); + } + + br_read_unlock_bh(BR_NETPROTO_LOCK); +@@ -510,6 +521,14 @@ void nf_reinject(struct sk_buff *skb, st + + /* 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. */ +@@ -530,7 +549,7 @@ void nf_reinject(struct sk_buff *skb, st + verdict = nf_iterate(&nf_hooks[info->pf][info->hook], + &skb, info->hook, + info->indev, info->outdev, &elem, +- info->okfn); ++ info->okfn, INT_MIN); + } + + switch (verdict) { +--- linux-2.4.29/net/core/skbuff.c 2003-08-25 13:44:44.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/net/core/skbuff.c 2005-03-14 00:00:30.000000000 +0100 +@@ -246,6 +246,9 @@ static inline void skb_headerinit(void * + #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; +@@ -326,6 +329,9 @@ void __kfree_skb(struct sk_buff *skb) + } + #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); +@@ -393,6 +399,9 @@ struct sk_buff *skb_clone(struct sk_buff + #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); +@@ -405,6 +414,9 @@ struct sk_buff *skb_clone(struct sk_buff + 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; + } +@@ -440,6 +452,10 @@ static void copy_skb_header(struct sk_bu + #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; +@@ -726,9 +742,9 @@ struct sk_buff *skb_copy_expand(const st + /* Set the tail pointer and length */ + skb_put(n,skb->len); + +- /* Copy the data only. */ +- if (skb_copy_bits(skb, 0, n->data, skb->len)) +- BUG(); ++ /* Copy the linear data and header. */ ++ if (skb_copy_bits(skb, -newheadroom, n->head, newheadroom + skb->len)) ++ BUG(); + + copy_skb_header(n, skb); + return n; +--- linux-2.4.29/net/ipv4/netfilter/ip_tables.c 2005-01-19 15:10:13.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/ip_tables.c 2005-03-14 00:00:30.000000000 +0100 +@@ -118,12 +118,19 @@ static LIST_HEAD(ipt_tables); + 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)) + +@@ -153,7 +160,15 @@ ip_packet_match(const struct iphdr *ip, + & ((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)":""); +@@ -166,7 +181,15 @@ ip_packet_match(const struct iphdr *ip, + & ((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)":""); +@@ -265,6 +288,9 @@ ipt_do_table(struct sk_buff **pskb, + /* 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; + +@@ -274,6 +300,13 @@ ipt_do_table(struct sk_buff **pskb, + 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 +@@ -309,7 +342,15 @@ ipt_do_table(struct sk_buff **pskb, + 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-2.4.29/net/ipv4/ip_output.c 2005-01-19 15:10:13.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/ipv4/ip_output.c 2005-03-14 00:00:30.000000000 +0100 +@@ -890,6 +890,10 @@ int ip_fragment(struct sk_buff *skb, int + /* 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-2.4.29/net/ipv4/netfilter/ipt_LOG.c 2003-11-28 19:26:21.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/ipt_LOG.c 2005-03-14 00:00:30.000000000 +0100 +@@ -316,6 +316,18 @@ ipt_log_target(struct sk_buff **pskb, + 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-2.4.29/net/ipv4/netfilter/Makefile 2003-08-25 13:44:44.000000000 +0200 ++++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/Makefile 2005-03-14 00:00:30.000000000 +0100 +@@ -87,6 +87,8 @@ obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += i + 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-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o +--- linux-2.4.29/net/ipv4/netfilter/Config.in 2005-01-19 15:10:13.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/Config.in 2005-03-14 00:00:30.000000000 +0100 +@@ -44,6 +44,9 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ]; + 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 $CONFIG_IP_NF_IPTABLES ++ fi + # The targets + dep_tristate ' Packet filtering' CONFIG_IP_NF_FILTER $CONFIG_IP_NF_IPTABLES + if [ "$CONFIG_IP_NF_FILTER" != "n" ]; then +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/bridge/br_netfilter.c 2005-03-14 00:00:30.000000000 +0100 +@@ -0,0 +1,1101 @@ ++/* ++ * Handle firewalling ++ * Linux ethernet bridge ++ * ++ * Authors: ++ * Lennert Buytenhek <buytenh@gnu.org> ++ * Bart De Schuymer (maintainer) <bdschuym@pandora.be> ++ * ++ * Changes: ++ * Apr 29 2003: physdev module support (bdschuym) ++ * Jun 19 2003: let arptables see bridged ARP traffic (bdschuym) ++ * Oct 06 2003: filter encapsulated IP/ARP VLAN traffic on untagged bridge ++ * (bdschuym) ++ * Aug 28 2004: add IPv6 filtering (bdschuym) ++ * ++ * 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/if_vlan.h> ++#include <linux/netfilter_bridge.h> ++#include <linux/netfilter_ipv4.h> ++#include <linux/netfilter_ipv6.h> ++#include <linux/in_route.h> ++#include <net/ip.h> ++#include <net/ipv6.h> ++#include <asm/uaccess.h> ++#include <asm/checksum.h> ++#include "br_private.h" ++#ifdef CONFIG_SYSCTL ++#include <linux/sysctl.h> ++#endif ++ ++#define skb_origaddr(skb) (((struct bridge_skb_cb *) \ ++ (skb->nf_bridge->data))->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 has_bridge_parent(device) ((device)->br_port != NULL) ++#define bridge_parent(device) (&((device)->br_port->br->dev)) ++ ++#ifdef CONFIG_SYSCTL ++static struct ctl_table_header *brnf_sysctl_header; ++static int brnf_call_iptables = 1; ++static int brnf_call_ip6tables = 1; ++static int brnf_call_arptables = 1; ++static int brnf_filter_vlan_tagged = 1; ++#else ++#define brnf_filter_vlan_tagged 1 ++#endif ++ ++#define IS_VLAN_IP (skb->protocol == __constant_htons(ETH_P_8021Q) && \ ++ hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_IP) && \ ++ brnf_filter_vlan_tagged) ++#define IS_VLAN_IPV6 (skb->protocol == __constant_htons(ETH_P_8021Q) && \ ++ hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_IPV6) && \ ++ brnf_filter_vlan_tagged) ++/* ++#define IS_VLAN_ARP (skb->protocol == __constant_htons(ETH_P_8021Q) && \ ++ hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_ARP) && \ ++ brnf_filter_vlan_tagged) ++*/ ++ ++/* 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 *********************************************/ ++/* Undo the changes made for ip6tables PREROUTING and continue the ++ * bridge PRE_ROUTING hook. */ ++static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) ++{ ++ 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; ++ } ++ nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; ++ ++ skb->dst = (struct dst_entry *)&__fake_rtable; ++ dst_hold(skb->dst); ++ ++ skb->dev = nf_bridge->physindev; ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_push(skb, VLAN_HLEN); ++ skb->nh.raw -= VLAN_HLEN; ++ } ++ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, ++ br_handle_frame_finish, 1); ++ ++ return 0; ++} ++ ++static void __br_dnat_complain(void) ++{ ++ static unsigned long last_complaint; ++ ++ 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->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; ++ ++ skb->dev = bridge_parent(skb->dev); ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_pull(skb, VLAN_HLEN); ++ skb->nh.raw += VLAN_HLEN; ++ } ++ 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; ++ } ++ nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; ++ ++ 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; ++ if (skb->protocol == ++ __constant_htons(ETH_P_8021Q)) { ++ skb_push(skb, VLAN_HLEN); ++ skb->nh.raw -= VLAN_HLEN; ++ } ++ 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); ++ skb->pkt_type = PACKET_HOST; ++ } ++ } else { ++ skb->dst = (struct dst_entry *)&__fake_rtable; ++ dst_hold(skb->dst); ++ } ++ ++ skb->dev = nf_bridge->physindev; ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_push(skb, VLAN_HLEN); ++ skb->nh.raw -= VLAN_HLEN; ++ } ++ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, ++ br_handle_frame_finish, 1); ++ ++ return 0; ++} ++ ++/* Some common code for IPv4/IPv6 */ ++static void setup_pre_routing(struct sk_buff *skb) ++{ ++ struct nf_bridge_info *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_NF_BRIDGE_PREROUTING; ++ nf_bridge->physindev = skb->dev; ++ skb->dev = bridge_parent(skb->dev); ++} ++ ++/* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ ++static int check_hbh_len(struct sk_buff *skb) ++{ ++ unsigned char *raw = (u8*)(skb->nh.ipv6h+1); ++ u32 pkt_len; ++ int off = raw - skb->nh.raw; ++ int len = (raw[1]+1)<<3; ++ ++ if ((raw + len) - skb->data > skb_headlen(skb)) ++ goto bad; ++ ++ off += 2; ++ len -= 2; ++ ++ while (len > 0) { ++ int optlen = raw[off+1]+2; ++ ++ switch (skb->nh.raw[off]) { ++ case IPV6_TLV_PAD0: ++ optlen = 1; ++ break; ++ ++ case IPV6_TLV_PADN: ++ break; ++ ++ case IPV6_TLV_JUMBO: ++ if (skb->nh.raw[off+1] != 4 || (off&3) != 2) ++ goto bad; ++ ++ pkt_len = ntohl(*(u32*)(skb->nh.raw+off+2)); ++ ++ if (pkt_len > skb->len - sizeof(struct ipv6hdr)) ++ goto bad; ++ if (pkt_len + sizeof(struct ipv6hdr) < skb->len) { ++ if (__pskb_trim(skb, ++ pkt_len + sizeof(struct ipv6hdr))) ++ goto bad; ++ if (skb->ip_summed == CHECKSUM_HW) ++ skb->ip_summed = CHECKSUM_NONE; ++ } ++ break; ++ default: ++ if (optlen > len) ++ goto bad; ++ break; ++ } ++ off += optlen; ++ len -= optlen; ++ } ++ if (len == 0) ++ return 0; ++bad: ++ return -1; ++ ++} ++ ++/* Replicate the checks that IPv6 does on packet reception and pass the packet ++ * to ip6tables, which doesn't support NAT, so things are fairly simple. */ ++static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, ++ struct sk_buff *skb, const struct net_device *in, ++ const struct net_device *out, int (*okfn)(struct sk_buff *)) ++{ ++ struct ipv6hdr *hdr; ++ u32 pkt_len; ++ struct nf_bridge_info *nf_bridge; ++ ++ if (skb->len < sizeof(struct ipv6hdr)) ++ goto inhdr_error; ++ ++ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) ++ goto inhdr_error; ++ ++ hdr = skb->nh.ipv6h; ++ ++ if (hdr->version != 6) ++ goto inhdr_error; ++ ++ pkt_len = ntohs(hdr->payload_len); ++ ++ if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { ++ if (pkt_len + sizeof(struct ipv6hdr) > skb->len) ++ goto inhdr_error; ++ if (pkt_len + sizeof(struct ipv6hdr) < skb->len) { ++ if (__pskb_trim(skb, pkt_len + sizeof(struct ipv6hdr))) ++ goto inhdr_error; ++ if (skb->ip_summed == CHECKSUM_HW) ++ skb->ip_summed = CHECKSUM_NONE; ++ } ++ } ++ if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) ++ goto inhdr_error; ++ ++#ifdef CONFIG_NETFILTER_DEBUG ++ skb->nf_debug ^= (1 << NF_IP6_PRE_ROUTING); ++#endif ++ if ((nf_bridge = nf_bridge_alloc(skb)) == NULL) ++ return NF_DROP; ++ setup_pre_routing(skb); ++ ++ NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL, ++ br_nf_pre_routing_finish_ipv6); ++ ++ return NF_STOLEN; ++ ++inhdr_error: ++ return NF_DROP; ++} ++ ++/* Direct IPv6 traffic to br_nf_pre_routing_ipv6. ++ * 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 = *pskb; ++ struct nf_bridge_info *nf_bridge; ++ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *) ++ ((*pskb)->mac.ethernet); ++ ++ if (skb->protocol == __constant_htons(ETH_P_IPV6) || IS_VLAN_IPV6) { ++#ifdef CONFIG_SYSCTL ++ if (!brnf_call_ip6tables) ++ return NF_ACCEPT; ++#endif ++ if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) ++ goto out; ++ ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_pull(skb, VLAN_HLEN); ++ (skb)->nh.raw += VLAN_HLEN; ++ } ++ return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); ++ } ++ ++#ifdef CONFIG_SYSCTL ++ if (!brnf_call_iptables) ++ return NF_ACCEPT; ++#endif ++ ++ if (skb->protocol != __constant_htons(ETH_P_IP) && !IS_VLAN_IP) ++ return NF_ACCEPT; ++ if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) ++ goto out; ++ ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_pull(skb, VLAN_HLEN); ++ (skb)->nh.raw += VLAN_HLEN; ++ } ++ ++ 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; ++ ++ setup_pre_routing(skb); ++ 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->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; ++ struct net_device *in; ++/* struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);*/ ++ ++#ifdef CONFIG_NETFILTER_DEBUG ++ skb->nf_debug ^= (1 << NF_BR_FORWARD); ++#endif ++ ++/* if (skb->protocol != __constant_htons(ETH_P_ARP) && !IS_VLAN_ARP) {*/ ++ in = nf_bridge->physindev; ++ if (nf_bridge->mask & BRNF_PKT_TYPE) { ++ skb->pkt_type = PACKET_OTHERHOST; ++ nf_bridge->mask ^= BRNF_PKT_TYPE; ++ } ++/* } else { ++ in = *((struct net_device **)(skb->cb)); ++ }*/ ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_push(skb, VLAN_HLEN); ++ skb->nh.raw -= VLAN_HLEN; ++ } ++ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, ++ skb->dev, br_forward_finish, 1); ++ return 0; ++} ++ ++/* This is the 'purely bridged' case. For IP, 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. For ARP, indev and outdev are the ++ * bridge ports. ++ */ ++static unsigned int br_nf_forward_ip(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; ++ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet); ++ int pf; ++ ++ if (!skb->nf_bridge) ++ return NF_ACCEPT; ++ ++ if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP) ++ pf = PF_INET; ++ else ++ pf = PF_INET6; ++ ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_pull(*pskb, VLAN_HLEN); ++ (*pskb)->nh.raw += VLAN_HLEN; ++ } ++ ++#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; ++ } ++ ++ /* The physdev module checks on this */ ++ nf_bridge->mask |= BRNF_BRIDGED; ++ nf_bridge->physoutdev = skb->dev; ++ ++ NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), ++ bridge_parent(out), br_nf_forward_finish); ++ ++ return NF_STOLEN; ++} ++ ++/* ++static unsigned int br_nf_forward_arp(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 vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet); ++ struct net_device **d = (struct net_device **)(skb->cb); ++ ++ if (!brnf_call_arptables) ++ return NF_ACCEPT; ++ ++ if (skb->protocol != __constant_htons(ETH_P_ARP)) { ++ if (!IS_VLAN_ARP) ++ return NF_ACCEPT; ++ skb_pull(*pskb, VLAN_HLEN); ++ (*pskb)->nh.raw += VLAN_HLEN; ++ } ++ ++#ifdef CONFIG_NETFILTER_DEBUG ++ skb->nf_debug ^= (1 << NF_BR_FORWARD); ++#endif ++ ++ if (skb->nh.arph->ar_pln != 4) { ++ if (IS_VLAN_ARP) { ++ skb_push(*pskb, VLAN_HLEN); ++ (*pskb)->nh.raw -= VLAN_HLEN; ++ } ++ return NF_ACCEPT; ++ } ++ *d = (struct net_device *)in; ++ NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, ++ (struct net_device *)out, 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 ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_push(skb, VLAN_HLEN); ++ skb->nh.raw -= VLAN_HLEN; ++ } ++ ++ 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 *)) ++{ ++ struct net_device *realindev, *realoutdev; ++ struct sk_buff *skb = *pskb; ++ struct nf_bridge_info *nf_bridge; ++ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet); ++ int pf; ++ ++ if (!skb->nf_bridge) ++ return NF_ACCEPT; ++ ++ if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP) ++ pf = PF_INET; ++ else ++ pf = PF_INET6; ++ ++#ifdef CONFIG_NETFILTER_DEBUG ++ /* Sometimes we get packets with NULL ->dst here (for example, ++ * running a dhcp client daemon triggers this). This should now ++ * be fixed, but let's keep the check around. */ ++ if (skb->dst == NULL) { ++ printk(KERN_CRIT "br_netfilter: skb->dst == NULL."); ++ return NF_ACCEPT; ++ } ++#endif ++ ++ 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) { ++ if (nf_bridge->mask & BRNF_PKT_TYPE) { ++ skb->pkt_type = PACKET_OTHERHOST; ++ nf_bridge->mask ^= BRNF_PKT_TYPE; ++ } ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_push(skb, VLAN_HLEN); ++ skb->nh.raw -= VLAN_HLEN; ++ } ++ ++ NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, ++ skb->dev, br_forward_finish); ++ goto out; ++ } ++ realoutdev = bridge_parent(skb->dev); ++ ++#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) ++ /* iptables should match -o br0.x */ ++ if (nf_bridge->netoutdev) ++ realoutdev = nf_bridge->netoutdev; ++#endif ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_pull(skb, VLAN_HLEN); ++ (*pskb)->nh.raw += VLAN_HLEN; ++ } ++ /* 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, NF_IP_FORWARD, skb, realindev, ++ realoutdev, 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, NF_IP_LOCAL_OUT, skb, realindev, ++ realoutdev, okfn, ++ NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1); ++ } ++ ++out: ++ 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; ++ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet); ++ struct net_device *realoutdev = bridge_parent(skb->dev); ++ int pf; ++ ++#ifdef CONFIG_NETFILTER_DEBUG ++ /* Be very paranoid. This probably won't happen anymore, but let's ++ * keep the check just to be sure... */ ++ 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."); ++ goto print_error; ++ } ++#endif ++ ++ if (!nf_bridge) ++ return NF_ACCEPT; ++ ++ if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP) ++ pf = PF_INET; ++ else ++ pf = PF_INET6; ++ ++ /* 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 ++ /* Sometimes we get packets with NULL ->dst here (for example, ++ * running a dhcp client daemon triggers this). This should now ++ * be fixed, but let's keep the check around. ++ */ ++ if (skb->dst == NULL) { ++ printk(KERN_CRIT "br_netfilter: skb->dst == NULL."); ++ goto print_error; ++ } ++ ++ 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; ++ } ++ ++ if (skb->protocol == __constant_htons(ETH_P_8021Q)) { ++ skb_pull(skb, VLAN_HLEN); ++ skb->nh.raw += VLAN_HLEN; ++ } ++ ++ nf_bridge_save_header(skb); ++ ++#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) ++ if (nf_bridge->netoutdev) ++ realoutdev = nf_bridge->netoutdev; ++#endif ++ NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, ++ realoutdev, br_dev_queue_push_xmit); ++ ++ return NF_STOLEN; ++ ++#ifdef CONFIG_NETFILTER_DEBUG ++print_error: ++ if (skb->dev != NULL) { ++ printk("[%s]", skb->dev->name); ++ if (has_bridge_parent(skb->dev)) ++ printk("[%s]", bridge_parent(skb->dev)->name); ++ } ++ printk(" head:%p, raw:%p, data:%p\n", skb->head, skb->mac.raw, ++ skb->data); ++ return NF_ACCEPT; ++#endif ++} ++ ++ ++/* IPv4/SABOTAGE *****************************************************/ ++ ++/* Don't hand locally destined packets to PF_INET/PRE_ROUTING ++ * for the second time. ++ */ ++static unsigned int ip_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 ((*pskb)->nf_bridge && ++ !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { ++ return NF_STOP; ++ } ++ ++ 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 ip_sabotage_out(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 ((out->hard_start_xmit == br_dev_xmit && ++ okfn != br_nf_forward_finish && ++ okfn != br_nf_local_out_finish && ++ okfn != br_dev_queue_push_xmit) ++#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) ++ || ((out->priv_flags & IFF_802_1Q_VLAN) && ++ VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit) ++#endif ++ ) { ++ struct nf_bridge_info *nf_bridge; ++ ++ if (!skb->nf_bridge) { ++#ifdef CONFIG_SYSCTL ++ /* This code is executed while in the IP(v6) stack, ++ the version should be 4 or 6. We can't use ++ skb->protocol because that isn't set on ++ PF_INET(6)/LOCAL_OUT. */ ++ struct iphdr *ip = skb->nh.iph; ++ ++ if (ip->version == 4 && !brnf_call_iptables) ++ return NF_ACCEPT; ++ else if (ip->version == 6 && !brnf_call_ip6tables) ++ return NF_ACCEPT; ++#endif ++ if (hook == NF_IP_POST_ROUTING) ++ return NF_ACCEPT; ++ if (!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; ++ } ++#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) ++ /* the iptables outdev is br0.x, not br0 */ ++ if (out->priv_flags & IFF_802_1Q_VLAN) ++ nf_bridge->netoutdev = (struct net_device *)out; ++#endif ++ return NF_STOP; ++ } ++ ++ 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_ip, ++ .pf = PF_BRIDGE, ++ .hooknum = NF_BR_FORWARD, ++ .priority = NF_BR_PRI_BRNF /*- 1*/, }, ++/* { .hook = br_nf_forward_arp, ++ .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 = ip_sabotage_in, ++ .pf = PF_INET, ++ .hooknum = NF_IP_PRE_ROUTING, ++ .priority = NF_IP_PRI_FIRST, }, ++ { .hook = ip_sabotage_in, ++ .pf = PF_INET6, ++ .hooknum = NF_IP6_PRE_ROUTING, ++ .priority = NF_IP6_PRI_FIRST, }, ++ { .hook = ip_sabotage_out, ++ .pf = PF_INET, ++ .hooknum = NF_IP_FORWARD, ++ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, }, ++ { .hook = ip_sabotage_out, ++ .pf = PF_INET6, ++ .hooknum = NF_IP6_FORWARD, ++ .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_FORWARD, }, ++ { .hook = ip_sabotage_out, ++ .pf = PF_INET, ++ .hooknum = NF_IP_LOCAL_OUT, ++ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, }, ++ { .hook = ip_sabotage_out, ++ .pf = PF_INET6, ++ .hooknum = NF_IP6_LOCAL_OUT, ++ .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, }, ++ { .hook = ip_sabotage_out, ++ .pf = PF_INET, ++ .hooknum = NF_IP_POST_ROUTING, ++ .priority = NF_IP_PRI_FIRST, }, ++ { .hook = ip_sabotage_out, ++ .pf = PF_INET6, ++ .hooknum = NF_IP6_POST_ROUTING, ++ .priority = NF_IP6_PRI_FIRST, }, ++}; ++ ++#ifdef CONFIG_SYSCTL ++static ++int brnf_sysctl_call_tables(ctl_table *ctl, int write, struct file * filp, ++ void *buffer, size_t *lenp) ++{ ++ int ret; ++ ++ ret = proc_dointvec(ctl, write, filp, buffer, lenp); ++ ++ if (write && *(int *)(ctl->data)) ++ *(int *)(ctl->data) = 1; ++ return ret; ++} ++ ++static ctl_table brnf_table[] = { ++ { ++ .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES, ++ .procname = "bridge-nf-call-arptables", ++ .data = &brnf_call_arptables, ++ .maxlen = sizeof(int), ++ .mode = 0644, ++ .proc_handler = &brnf_sysctl_call_tables, ++ }, ++ { ++ .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES, ++ .procname = "bridge-nf-call-iptables", ++ .data = &brnf_call_iptables, ++ .maxlen = sizeof(int), ++ .mode = 0644, ++ .proc_handler = &brnf_sysctl_call_tables, ++ }, ++ { ++ .ctl_name = NET_BRIDGE_NF_CALL_IP6TABLES, ++ .procname = "bridge-nf-call-ip6tables", ++ .data = &brnf_call_ip6tables, ++ .maxlen = sizeof(int), ++ .mode = 0644, ++ .proc_handler = &brnf_sysctl_call_tables, ++ }, ++ { ++ .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED, ++ .procname = "bridge-nf-filter-vlan-tagged", ++ .data = &brnf_filter_vlan_tagged, ++ .maxlen = sizeof(int), ++ .mode = 0644, ++ .proc_handler = &brnf_sysctl_call_tables, ++ }, ++ { .ctl_name = 0 } ++}; ++ ++static ctl_table brnf_bridge_table[] = { ++ { ++ .ctl_name = NET_BRIDGE, ++ .procname = "bridge", ++ .mode = 0555, ++ .child = brnf_table, ++ }, ++ { .ctl_name = 0 } ++}; ++ ++static ctl_table brnf_net_table[] = { ++ { ++ .ctl_name = CTL_NET, ++ .procname = "net", ++ .mode = 0555, ++ .child = brnf_bridge_table, ++ }, ++ { .ctl_name = 0 } ++}; ++#endif ++ ++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; ++ } ++ ++#ifdef CONFIG_SYSCTL ++ brnf_sysctl_header = register_sysctl_table(brnf_net_table, 0); ++ if (brnf_sysctl_header == NULL) { ++ printk(KERN_WARNING "br_netfilter: can't register to sysctl.\n"); ++ for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) ++ nf_unregister_hook(&br_nf_ops[i]); ++ return -EFAULT; ++ } ++#endif ++ ++ 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]); ++#ifdef CONFIG_SYSCTL ++ unregister_sysctl_table(brnf_sysctl_header); ++#endif ++ ++} +--- /dev/null 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/ipt_physdev.c 2005-03-14 00:00:30.000000000 +0100 +@@ -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 2005-03-14 20:10:29.001600248 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv4/ipt_physdev.h 2005-03-14 21:24:30.000000000 +0100 +@@ -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 { ++ char physindev[IFNAMSIZ]; ++ char in_mask[IFNAMSIZ]; ++ char physoutdev[IFNAMSIZ]; ++ char out_mask[IFNAMSIZ]; ++ u_int8_t invert; ++ u_int8_t bitmask; ++}; ++ ++#endif /*_IPT_PHYSDEV_H*/ +--- linux-2.4.29/net/8021q/vlan_dev.c 2005-01-19 15:10:13.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/8021q/vlan_dev.c 2005-03-14 00:00:30.000000000 +0100 +@@ -488,6 +488,10 @@ int vlan_dev_hard_start_xmit(struct sk_b + stats->tx_packets++; /* for statics only */ + stats->tx_bytes += skb->len; + ++ skb->protocol = __constant_htons(ETH_P_8021Q); ++ skb->mac.raw -= VLAN_HLEN; ++ skb->nh.raw -= VLAN_HLEN; ++ + skb->dev = VLAN_DEV_INFO(dev)->real_dev; + dev_queue_xmit(skb); + +--- linux-2.4.29/include/linux/sysctl.h 2005-01-19 15:10:13.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/include/linux/sysctl.h 2005-03-14 21:07:18.000000000 +0100 +@@ -608,6 +608,15 @@ enum { + NET_DECNET_CONF_DEV_STATE = 7 + }; + ++/* /proc/sys/net/bridge */ ++enum { ++ NET_BRIDGE_NF_CALL_ARPTABLES = 1, ++ NET_BRIDGE_NF_CALL_IPTABLES = 2, ++ NET_BRIDGE_NF_CALL_IP6TABLES = 3, ++ NET_BRIDGE_NF_FILTER_VLAN_TAGGED = 4, ++}; ++ ++ + /* CTL_PROC names: */ + + /* CTL_FS names: */ +--- linux-2.4.29/net/ipv4/netfilter/ipt_REJECT.c 2005-01-19 15:10:13.000000000 +0100 ++++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/ipt_REJECT.c 2005-03-14 00:00:30.000000000 +0100 +@@ -15,6 +15,9 @@ + #include <net/route.h> + #include <linux/netfilter_ipv4/ip_tables.h> + #include <linux/netfilter_ipv4/ipt_REJECT.h> ++#ifdef CONFIG_BRIDGE_NETFILTER ++#include <linux/netfilter_bridge.h> ++#endif + + #if 0 + #define DEBUGP printk +@@ -29,7 +32,13 @@ static inline struct rtable *route_rever + struct rt_key key = {}; + struct rtable *rt; + +- if (hook != NF_IP_FORWARD) { ++ /* We don't require ip forwarding to be enabled to be able to ++ * send a RST reply for bridged traffic. */ ++ if (hook != NF_IP_FORWARD ++#ifdef CONFIG_BRIDGE_NETFILTER ++ || (skb->nf_bridge && skb->nf_bridge->mask & BRNF_BRIDGED) ++#endif ++ ) { + key.dst = iph->saddr; + if (hook == NF_IP_LOCAL_IN) + key.src = iph->daddr; |