--- linux-2.4.23/net/bridge/br_private.h 2003-08-25 13:44:44.000000000 +0200 +++ linux-2.4.23-ebt-brnf/net/bridge/br_private.h 2003-12-15 21:29:45.000000000 +0100 @@ -144,8 +144,10 @@ 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); @@ -166,7 +168,8 @@ 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 void br_call_ioctl_atomic(void (*fn)(void)); @@ -177,6 +180,10 @@ 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-2.4.23/include/linux/if_bridge.h 2001-11-22 20:47:12.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/if_bridge.h 2003-12-15 21:29:45.000000000 +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-2.4.23/net/core/dev.c 2003-11-28 19:26:21.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/core/dev.c 2003-12-15 21:29:45.000000000 +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; } @@ -1503,8 +1502,13 @@ 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) { - 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 for (ptype=ptype_base[ntohs(type)&15];ptype;ptype=ptype->next) { --- linux-2.4.23/net/bridge/br_input.c 2003-08-25 13:44:44.000000000 +0200 +++ linux-2.4.23-ebt-brnf/net/bridge/br_input.c 2003-12-15 21:29:45.000000000 +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-2.4.23/net/bridge/br_forward.c 2003-11-28 19:26:21.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/br_forward.c 2003-12-15 21:29:45.000000000 +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-2.4.23/net/bridge/br.c 2002-11-29 00:53:15.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/br.c 2003-12-15 21:29:45.000000000 +0100 @@ -29,6 +29,8 @@ #include "../atm/lec.h" #endif +int (*br_should_route_hook) (struct sk_buff **pskb) = NULL; + void br_dec_use_count() { MOD_DEC_USE_COUNT; @@ -43,6 +45,10 @@ 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) @@ -61,6 +67,9 @@ static void __br_clear_ioctl_hook(void) static void __exit br_deinit(void) { +#ifdef CONFIG_NETFILTER + br_netfilter_fini(); +#endif unregister_netdevice_notifier(&br_device_notifier); br_call_ioctl_atomic(__br_clear_ioctl_hook); @@ -74,7 +83,7 @@ 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-2.4.23/net/bridge/Makefile 2000-12-29 23:07:24.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/Makefile 2003-12-15 21:29:45.000000000 +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-2.4.23/include/linux/netfilter_bridge.h 2001-06-12 04:15:27.000000000 +0200 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge.h 2003-12-15 21:29:45.000000000 +0100 @@ -6,6 +6,12 @@ #include #include +#if defined(__KERNEL__) && defined(CONFIG_NETFILTER) +#include +#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) +#include +#endif +#endif /* Bridge Hooks */ /* After promisc drops, checksum checks. */ @@ -18,7 +24,80 @@ #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 defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) + if (skb->protocol == __constant_htons(ETH_P_8021Q)) { + memcpy(skb->data - 18, skb->nf_bridge->hh, 18); + skb_push(skb, 4); + } else +#endif + memcpy(skb->data - 16, skb->nf_bridge->hh, 16); + } +} + +static inline +void nf_bridge_save_header(struct sk_buff *skb) +{ + int header_size = 16; + +#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) + if (skb->protocol == __constant_htons(ETH_P_8021Q)) + header_size = 18; +#endif + memcpy(skb->nf_bridge->hh, skb->data - header_size, header_size); +} +struct bridge_skb_cb { + union { + __u32 ipv4; + } daddr; +}; +#endif /* CONFIG_NETFILTER */ +#endif /* __KERNEL__ */ #endif --- linux-2.4.23/net/Makefile 2003-11-28 19:26:21.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/Makefile 2003-12-15 21:30:50.000000000 +0100 @@ -7,7 +7,8 @@ O_TARGET := network.o -mod-subdirs := ipv4/netfilter ipv6/netfilter ipx irda bluetooth atm netlink sched core sctp +mod-subdirs := ipv4/netfilter ipv6/netfilter bridge/netfilter ipx irda \ + bluetooth atm netlink sched core sctp 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-2.4.23/net/Config.in 2003-11-28 19:26:21.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/Config.in 2003-12-15 21:29:45.000000000 +0100 @@ -68,6 +68,9 @@ 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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/Makefile 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,33 @@ +# +# 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-$(CONFIG_BRIDGE_EBT_ARPREPLY) += ebt_arpreply.o +obj-$(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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/Config.in 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,22 @@ +# +# Bridge netfilter configuration +# +dep_tristate ' Bridge: ebtables' CONFIG_BRIDGE_NF_EBTABLES $CONFIG_BRIDGE +dep_tristate ' ebt: filter table support' CONFIG_BRIDGE_EBT_T_FILTER $CONFIG_BRIDGE_NF_EBTABLES +dep_tristate ' ebt: nat table support' CONFIG_BRIDGE_EBT_T_NAT $CONFIG_BRIDGE_NF_EBTABLES +dep_tristate ' ebt: broute table support' CONFIG_BRIDGE_EBT_BROUTE $CONFIG_BRIDGE_NF_EBTABLES +dep_tristate ' ebt: log support' CONFIG_BRIDGE_EBT_LOG $CONFIG_BRIDGE_NF_EBTABLES +dep_tristate ' ebt: IP filter support' CONFIG_BRIDGE_EBT_IPF $CONFIG_BRIDGE_NF_EBTABLES +dep_tristate ' ebt: ARP filter support' CONFIG_BRIDGE_EBT_ARPF $CONFIG_BRIDGE_NF_EBTABLES +dep_tristate ' ebt: 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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebtable_filter.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,90 @@ +/* + * ebtable_filter + * + * Authors: + * Bart De Schuymer + * + * April, 2002 + * + */ + +#include +#include + +#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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebtable_nat.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,96 @@ +/* + * ebtable_nat + * + * Authors: + * Bart De Schuymer + * + * April, 2002 + * + */ + +#include +#include +#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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebtable_broute.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,79 @@ +/* + * ebtable_broute + * + * Authors: + * Bart De Schuymer + * + * 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 +#include +#include +#include + +// 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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_among.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,223 @@ +/* + * ebt_among + * + * Authors: + * Grzegorz Borowiak + * + * August, 2003 + * + */ + +#include +#include +#include +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_limit.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,101 @@ +/* + * ebt_limit + * + * Authors: + * Tom Marshall + * + * Mostly copied from netfilter's ipt_limit.c, see that file for explanation + * + * September, 2003 + * + */ + +#include +#include +#include + +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_arpreply.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,86 @@ +/* + * ebt_arpreply + * + * Authors: + * Grzegorz Borowiak + * Bart De Schuymer + * + * August, 2003 + * + */ + +#include +#include +#include +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_802_3.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,74 @@ +/* + * 802_3 + * + * Author: + * Chris Vitale csv@bluetail.com + * + * May 2003 + * + */ + +#include +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_mark.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,66 @@ +/* + * ebt_mark + * + * Authors: + * Bart De Schuymer + * + * 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 +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_mark_m.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,61 @@ +/* + * ebt_mark_m + * + * Authors: + * Bart De Schuymer + * + * July, 2002 + * + */ + +#include +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_pkttype.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,60 @@ +/* + * ebt_pkttype + * + * Authors: + * Bart De Schuymer + * + * April, 2003 + * + */ + +#include +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_stp.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,191 @@ +/* + * ebt_stp + * + * Authors: + * Bart De Schuymer + * Stephen Hemminger + * + * June, 2003 + */ + +#include +#include +#include + +#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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_redirect.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,71 @@ +/* + * ebt_redirect + * + * Authors: + * Bart De Schuymer + * + * April, 2002 + * + */ + +#include +#include +#include +#include +#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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_arp.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,149 @@ +/* + * ebt_arp + * + * Authors: + * Bart De Schuymer + * Tim Gardner + * + * April, 2002 + * + */ + +#include +#include +#include +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_ip.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,121 @@ +/* + * ebt_ip + * + * Authors: + * Bart De Schuymer + * + * April, 2002 + * + * Changes: + * added ip-sport and ip-dport + * Innominate Security Technologies AG + * September, 2002 + */ + +#include +#include +#include +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_vlan.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,259 @@ +/* + * Description: EBTables 802.1Q match extension kernelspace module. + * Authors: Nick Fedchik + * Bart De Schuymer + * + * 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 +#include +#include +#include +#include + +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 "); +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_log.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,152 @@ +/* + * ebt_log + * + * Authors: + * Bart De Schuymer + * + * April, 2002 + * + */ + +#include +#include +#include +#include +#include +#include +#include + +static spinlock_t ebt_log_lock = SPIN_LOCK_UNLOCKED; + +static int ebt_log_check(const char *tablename, unsigned int hookmask, + const struct ebt_entry *e, void *data, unsigned int datalen) +{ + struct ebt_log_info *info = (struct ebt_log_info *)data; + + if (datalen != EBT_ALIGN(sizeof(struct ebt_log_info))) + return -EINVAL; + if (info->bitmask & ~EBT_LOG_MASK) + return -EINVAL; + if (info->loglevel >= 8) + return -EINVAL; + info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0'; + return 0; +} + +struct tcpudphdr +{ + uint16_t src; + uint16_t dst; +}; + +struct arppayload +{ + unsigned char mac_src[ETH_ALEN]; + unsigned char ip_src[4]; + unsigned char mac_dst[ETH_ALEN]; + unsigned char ip_dst[4]; +}; + +static void print_MAC(unsigned char *p) +{ + int i; + + for (i = 0; i < ETH_ALEN; i++, p++) + printk("%02x%c", *p, i == ETH_ALEN - 1 ? ' ':':'); +} + +#define myNIPQUAD(a) a[0], a[1], a[2], a[3] +static void ebt_log(const struct sk_buff *skb, const struct net_device *in, + const struct net_device *out, const void *data, unsigned int datalen) +{ + struct ebt_log_info *info = (struct ebt_log_info *)data; + char level_string[4] = "< >"; + level_string[1] = '0' + info->loglevel; + + spin_lock_bh(&ebt_log_lock); + printk(level_string); + printk("%s IN=%s OUT=%s ", info->prefix, in ? in->name : "", + out ? out->name : ""); + + printk("MAC source = "); + print_MAC((skb->mac.ethernet)->h_source); + printk("MAC dest = "); + print_MAC((skb->mac.ethernet)->h_dest); + + printk("proto = 0x%04x", ntohs(((*skb).mac.ethernet)->h_proto)); + + if ((info->bitmask & EBT_LOG_IP) && skb->mac.ethernet->h_proto == + htons(ETH_P_IP)){ + struct iphdr *iph = skb->nh.iph; + printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u,", + NIPQUAD(iph->saddr), NIPQUAD(iph->daddr)); + printk(" IP tos=0x%02X, IP proto=%d", iph->tos, iph->protocol); + if (iph->protocol == IPPROTO_TCP || + iph->protocol == IPPROTO_UDP) { + struct tcpudphdr *ports = (struct tcpudphdr *)(skb->data + iph->ihl*4); + + if (skb->data + iph->ihl*4 > skb->tail) { + printk(" INCOMPLETE TCP/UDP header"); + goto out; + } + printk(" SPT=%u DPT=%u", ntohs(ports->src), + ntohs(ports->dst)); + } + goto out; + } + + if ((info->bitmask & EBT_LOG_ARP) && + ((skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) || + (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_RARP)))) { + struct arphdr * arph = skb->nh.arph; + printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d", + ntohs(arph->ar_hrd), ntohs(arph->ar_pro), + ntohs(arph->ar_op)); + /* If it's for Ethernet and the lengths are OK, + * then log the ARP payload */ + if (arph->ar_hrd == __constant_htons(1) && + arph->ar_hln == ETH_ALEN && + arph->ar_pln == sizeof(uint32_t)) { + struct arppayload *arpp = (struct arppayload *)(skb->data + sizeof(*arph)); + + if (skb->data + sizeof(*arph) > skb->tail) { + printk(" INCOMPLETE ARP header"); + goto out; + } + + printk(" ARP MAC SRC="); + print_MAC(arpp->mac_src); + printk(" ARP IP SRC=%u.%u.%u.%u", + myNIPQUAD(arpp->ip_src)); + printk(" ARP MAC DST="); + print_MAC(arpp->mac_dst); + printk(" ARP IP DST=%u.%u.%u.%u", + myNIPQUAD(arpp->ip_dst)); + } + + } +out: + printk("\n"); + spin_unlock_bh(&ebt_log_lock); +} + +static struct ebt_watcher log = +{ + {NULL, NULL}, EBT_LOG_WATCHER, ebt_log, ebt_log_check, NULL, + THIS_MODULE +}; + +static int __init init(void) +{ + return ebt_register_watcher(&log); +} + +static void __exit fini(void) +{ + ebt_unregister_watcher(&log); +} + +module_init(init); +module_exit(fini); +EXPORT_NO_SYMBOLS; +MODULE_LICENSE("GPL"); --- /dev/null 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_snat.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,64 @@ +/* + * ebt_snat + * + * Authors: + * Bart De Schuymer + * + * June, 2002 + * + */ + +#include +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebt_dnat.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,65 @@ +/* + * ebt_dnat + * + * Authors: + * Bart De Schuymer + * + * June, 2002 + * + */ + +#include +#include +#include +#include + +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/netfilter/ebtables.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,1490 @@ +/* + * ebtables + * + * Author: + * Bart De Schuymer + * + * 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 +#include + +#include +#include +#include +#include +#include +#include +#include +#include +// 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 + +#if 0 // use this for remote debugging +// Copyright (C) 1998 by Ori Pomerantz +// Print the string to the appropriate tty, the one +// the current task uses +static void print_string(char *str) +{ + struct tty_struct *my_tty; + + /* The tty for the current task */ + my_tty = current->tty; + if (my_tty != NULL) { + (*(my_tty->driver).write)(my_tty, 0, str, strlen(str)); + (*(my_tty->driver).write)(my_tty, 0, "\015\012", 2); + } +} + +#define BUGPRINT(args) print_string(args); +#else +#define BUGPRINT(format, args...) printk("kernel msg: ebtables bug: please "\ + "report to author: "format, ## args) +// #define BUGPRINT(format, args...) +#endif +#define MEMPRINT(format, args...) printk("kernel msg: ebtables "\ + ": out of memory: "format, ## args) +// #define MEMPRINT(format, args...) + + + +// Each cpu has its own set of counters, so there is no need for write_lock in +// the softirq +// For reading or updating the counters, the user context needs to +// get a write_lock + +// The size of each set of counters is altered to get cache alignment +#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1)) +#define COUNTER_OFFSET(n) (SMP_ALIGN(n * sizeof(struct ebt_counter))) +#define COUNTER_BASE(c, n, cpu) ((struct ebt_counter *)(((char *)c) + \ + COUNTER_OFFSET(n) * cpu)) + + + +static DECLARE_MUTEX(ebt_mutex); +static LIST_HEAD(ebt_tables); +static LIST_HEAD(ebt_targets); +static LIST_HEAD(ebt_matches); +static LIST_HEAD(ebt_watchers); + +static struct ebt_target ebt_standard_target = +{ {NULL, NULL}, EBT_STANDARD_TARGET, NULL, NULL, NULL, NULL}; + +static inline int ebt_do_watcher (struct ebt_entry_watcher *w, + const struct sk_buff *skb, const struct net_device *in, + const struct net_device *out) +{ + w->u.watcher->watcher(skb, in, out, w->data, + w->watcher_size); + // watchers don't give a verdict + return 0; +} + +static inline int ebt_do_match (struct ebt_entry_match *m, + const struct sk_buff *skb, const struct net_device *in, + const struct net_device *out) +{ + return m->u.match->match(skb, in, out, m->data, + m->match_size); +} + +static inline int ebt_dev_check(char *entry, const struct net_device *device) +{ + if (*entry == '\0') + return 0; + if (!device) + return 1; + return !!strcmp(entry, device->name); +} + +#define FWINV2(bool,invflg) ((bool) ^ !!(e->invflags & invflg)) +// process standard matches +static inline int ebt_basic_match(struct ebt_entry *e, struct ethhdr *h, + const struct net_device *in, const struct net_device *out) +{ + int verdict, i; + + if (e->bitmask & EBT_802_3) { + if (FWINV2(ntohs(h->h_proto) >= 1536, EBT_IPROTO)) + return 1; + } else if (!(e->bitmask & EBT_NOPROTO) && + FWINV2(e->ethproto != h->h_proto, EBT_IPROTO)) + return 1; + + if (FWINV2(ebt_dev_check(e->in, in), EBT_IIN)) + return 1; + if (FWINV2(ebt_dev_check(e->out, out), EBT_IOUT)) + return 1; + if ((!in || !in->br_port) ? 0 : FWINV2(ebt_dev_check( + e->logical_in, &in->br_port->br->dev), EBT_ILOGICALIN)) + return 1; + if ((!out || !out->br_port) ? 0 : FWINV2(ebt_dev_check( + e->logical_out, &out->br_port->br->dev), EBT_ILOGICALOUT)) + return 1; + + if (e->bitmask & EBT_SOURCEMAC) { + verdict = 0; + for (i = 0; i < 6; i++) + verdict |= (h->h_source[i] ^ e->sourcemac[i]) & + e->sourcemsk[i]; + if (FWINV2(verdict != 0, EBT_ISOURCE) ) + return 1; + } + if (e->bitmask & EBT_DESTMAC) { + verdict = 0; + for (i = 0; i < 6; i++) + verdict |= (h->h_dest[i] ^ e->destmac[i]) & + e->destmsk[i]; + if (FWINV2(verdict != 0, EBT_IDEST) ) + return 1; + } + return 0; +} + +// Do some firewalling +unsigned int ebt_do_table (unsigned int hook, struct sk_buff **pskb, + const struct net_device *in, const struct net_device *out, + struct ebt_table *table) +{ + int i, nentries; + struct ebt_entry *point; + struct ebt_counter *counter_base, *cb_base; + struct ebt_entry_target *t; + int verdict, sp = 0; + struct ebt_chainstack *cs; + struct ebt_entries *chaininfo; + char *base; + struct ebt_table_info *private = table->private; + + read_lock_bh(&table->lock); + cb_base = COUNTER_BASE(private->counters, private->nentries, + cpu_number_map(smp_processor_id())); + if (private->chainstack) + cs = private->chainstack[cpu_number_map(smp_processor_id())]; + else + cs = NULL; + chaininfo = private->hook_entry[hook]; + nentries = private->hook_entry[hook]->nentries; + point = (struct ebt_entry *)(private->hook_entry[hook]->data); + counter_base = cb_base + private->hook_entry[hook]->counter_offset; + // base for chain jumps + base = private->entries; + i = 0; + while (i < nentries) { + if (ebt_basic_match(point, (**pskb).mac.ethernet, in, out)) + goto letscontinue; + + if (EBT_MATCH_ITERATE(point, ebt_do_match, *pskb, in, out) != 0) + goto letscontinue; + + // increase counter + (*(counter_base + i)).pcnt++; + (*(counter_base + i)).bcnt+=(**pskb).len; + + // these should only watch: not modify, nor tell us + // what to do with the packet + EBT_WATCHER_ITERATE(point, ebt_do_watcher, *pskb, in, + out); + + t = (struct ebt_entry_target *) + (((char *)point) + point->target_offset); + // standard target + if (!t->u.target->target) + verdict = ((struct ebt_standard_target *)t)->verdict; + else + verdict = t->u.target->target(pskb, hook, + in, out, t->data, t->target_size); + if (verdict == EBT_ACCEPT) { + read_unlock_bh(&table->lock); + return NF_ACCEPT; + } + if (verdict == EBT_DROP) { + read_unlock_bh(&table->lock); + return NF_DROP; + } + if (verdict == EBT_RETURN) { +letsreturn: +#ifdef CONFIG_NETFILTER_DEBUG + if (sp == 0) { + BUGPRINT("RETURN on base chain"); + // act like this is EBT_CONTINUE + goto letscontinue; + } +#endif + sp--; + // put all the local variables right + i = cs[sp].n; + chaininfo = cs[sp].chaininfo; + nentries = chaininfo->nentries; + point = cs[sp].e; + counter_base = cb_base + + chaininfo->counter_offset; + continue; + } + if (verdict == EBT_CONTINUE) + goto letscontinue; +#ifdef CONFIG_NETFILTER_DEBUG + if (verdict < 0) { + BUGPRINT("bogus standard verdict\n"); + read_unlock_bh(&table->lock); + return NF_DROP; + } +#endif + // jump to a udc + cs[sp].n = i + 1; + cs[sp].chaininfo = chaininfo; + cs[sp].e = (struct ebt_entry *) + (((char *)point) + point->next_offset); + i = 0; + chaininfo = (struct ebt_entries *) (base + verdict); +#ifdef CONFIG_NETFILTER_DEBUG + if (chaininfo->distinguisher) { + BUGPRINT("jump to non-chain\n"); + read_unlock_bh(&table->lock); + return NF_DROP; + } +#endif + nentries = chaininfo->nentries; + point = (struct ebt_entry *)chaininfo->data; + counter_base = cb_base + chaininfo->counter_offset; + sp++; + continue; +letscontinue: + point = (struct ebt_entry *) + (((char *)point) + point->next_offset); + i++; + } + + // I actually like this :) + if (chaininfo->policy == EBT_RETURN) + goto letsreturn; + if (chaininfo->policy == EBT_ACCEPT) { + read_unlock_bh(&table->lock); + return NF_ACCEPT; + } + read_unlock_bh(&table->lock); + return NF_DROP; +} + +// If it succeeds, returns element and locks mutex +static inline void * +find_inlist_lock_noload(struct list_head *head, const char *name, int *error, + struct semaphore *mutex) +{ + void *ret; + + *error = down_interruptible(mutex); + if (*error != 0) + return NULL; + + ret = list_named_find(head, name); + if (!ret) { + *error = -ENOENT; + up(mutex); + } + return ret; +} + +#ifndef CONFIG_KMOD +#define find_inlist_lock(h,n,p,e,m) find_inlist_lock_noload((h),(n),(e),(m)) +#else +static void * +find_inlist_lock(struct list_head *head, const char *name, const char *prefix, + int *error, struct semaphore *mutex) +{ + void *ret; + + ret = find_inlist_lock_noload(head, name, error, mutex); + if (!ret) { + char modulename[EBT_FUNCTION_MAXNAMELEN + strlen(prefix) + 1]; + strcpy(modulename, prefix); + strcat(modulename, name); + request_module(modulename); + ret = find_inlist_lock_noload(head, name, error, mutex); + } + return ret; +} +#endif + +static inline struct ebt_table * +find_table_lock(const char *name, int *error, struct semaphore *mutex) +{ + return find_inlist_lock(&ebt_tables, name, "ebtable_", error, mutex); +} + +static inline struct ebt_match * +find_match_lock(const char *name, int *error, struct semaphore *mutex) +{ + return find_inlist_lock(&ebt_matches, name, "ebt_", error, mutex); +} + +static inline struct ebt_watcher * +find_watcher_lock(const char *name, int *error, struct semaphore *mutex) +{ + return find_inlist_lock(&ebt_watchers, name, "ebt_", error, mutex); +} + +static inline struct ebt_target * +find_target_lock(const char *name, int *error, struct semaphore *mutex) +{ + return find_inlist_lock(&ebt_targets, name, "ebt_", error, mutex); +} + +static inline int +ebt_check_match(struct ebt_entry_match *m, struct ebt_entry *e, + const char *name, unsigned int hookmask, unsigned int *cnt) +{ + struct ebt_match *match; + int ret; + + if (((char *)m) + m->match_size + sizeof(struct ebt_entry_match) > + ((char *)e) + e->watchers_offset) + return -EINVAL; + match = find_match_lock(m->u.name, &ret, &ebt_mutex); + if (!match) + return ret; + m->u.match = match; + if (match->me) + __MOD_INC_USE_COUNT(match->me); + up(&ebt_mutex); + if (match->check && + match->check(name, hookmask, e, m->data, m->match_size) != 0) { + BUGPRINT("match->check failed\n"); + if (match->me) + __MOD_DEC_USE_COUNT(match->me); + return -EINVAL; + } + (*cnt)++; + return 0; +} + +static inline int +ebt_check_watcher(struct ebt_entry_watcher *w, struct ebt_entry *e, + const char *name, unsigned int hookmask, unsigned int *cnt) +{ + struct ebt_watcher *watcher; + int ret; + + if (((char *)w) + w->watcher_size + sizeof(struct ebt_entry_watcher) > + ((char *)e) + e->target_offset) + return -EINVAL; + watcher = find_watcher_lock(w->u.name, &ret, &ebt_mutex); + if (!watcher) + return ret; + w->u.watcher = watcher; + if (watcher->me) + __MOD_INC_USE_COUNT(watcher->me); + up(&ebt_mutex); + if (watcher->check && + watcher->check(name, hookmask, e, w->data, w->watcher_size) != 0) { + BUGPRINT("watcher->check failed\n"); + if (watcher->me) + __MOD_DEC_USE_COUNT(watcher->me); + return -EINVAL; + } + (*cnt)++; + return 0; +} + +// this one is very careful, as it is the first function +// to parse the userspace data +static inline int +ebt_check_entry_size_and_hooks(struct ebt_entry *e, + struct ebt_table_info *newinfo, char *base, char *limit, + struct ebt_entries **hook_entries, unsigned int *n, unsigned int *cnt, + unsigned int *totalcnt, unsigned int *udc_cnt, unsigned int valid_hooks) +{ + int i; + + for (i = 0; i < NF_BR_NUMHOOKS; i++) { + if ((valid_hooks & (1 << i)) == 0) + continue; + if ( (char *)hook_entries[i] - base == + (char *)e - newinfo->entries) + break; + } + // beginning of a new chain + // if i == NF_BR_NUMHOOKS it must be a user defined chain + if (i != NF_BR_NUMHOOKS || !(e->bitmask & EBT_ENTRY_OR_ENTRIES)) { + if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) != 0) { + // we make userspace set this right, + // so there is no misunderstanding + BUGPRINT("EBT_ENTRY_OR_ENTRIES shouldn't be set " + "in distinguisher\n"); + return -EINVAL; + } + // this checks if the previous chain has as many entries + // as it said it has + if (*n != *cnt) { + BUGPRINT("nentries does not equal the nr of entries " + "in the chain\n"); + return -EINVAL; + } + // before we look at the struct, be sure it is not too big + if ((char *)hook_entries[i] + sizeof(struct ebt_entries) + > limit) { + BUGPRINT("entries_size too small\n"); + return -EINVAL; + } + if (((struct ebt_entries *)e)->policy != EBT_DROP && + ((struct ebt_entries *)e)->policy != EBT_ACCEPT) { + // only RETURN from udc + if (i != NF_BR_NUMHOOKS || + ((struct ebt_entries *)e)->policy != EBT_RETURN) { + BUGPRINT("bad policy\n"); + return -EINVAL; + } + } + if (i == NF_BR_NUMHOOKS) // it's a user defined chain + (*udc_cnt)++; + else + newinfo->hook_entry[i] = (struct ebt_entries *)e; + if (((struct ebt_entries *)e)->counter_offset != *totalcnt) { + BUGPRINT("counter_offset != totalcnt"); + return -EINVAL; + } + *n = ((struct ebt_entries *)e)->nentries; + *cnt = 0; + return 0; + } + // a plain old entry, heh + if (sizeof(struct ebt_entry) > e->watchers_offset || + e->watchers_offset > e->target_offset || + e->target_offset >= e->next_offset) { + BUGPRINT("entry offsets not in right order\n"); + return -EINVAL; + } + // this is not checked anywhere else + if (e->next_offset - e->target_offset < sizeof(struct ebt_entry_target)) { + BUGPRINT("target size too small\n"); + return -EINVAL; + } + + (*cnt)++; + (*totalcnt)++; + return 0; +} + +struct ebt_cl_stack +{ + struct ebt_chainstack cs; + int from; + unsigned int hookmask; +}; + +// we need these positions to check that the jumps to a different part of the +// entries is a jump to the beginning of a new chain. +static inline int +ebt_get_udc_positions(struct ebt_entry *e, struct ebt_table_info *newinfo, + struct ebt_entries **hook_entries, unsigned int *n, unsigned int valid_hooks, + struct ebt_cl_stack *udc) +{ + int i; + + // we're only interested in chain starts + if (e->bitmask & EBT_ENTRY_OR_ENTRIES) + return 0; + for (i = 0; i < NF_BR_NUMHOOKS; i++) { + if ((valid_hooks & (1 << i)) == 0) + continue; + if (newinfo->hook_entry[i] == (struct ebt_entries *)e) + break; + } + // only care about udc + if (i != NF_BR_NUMHOOKS) + return 0; + + udc[*n].cs.chaininfo = (struct ebt_entries *)e; + // these initialisations are depended on later in check_chainloops() + udc[*n].cs.n = 0; + udc[*n].hookmask = 0; + + (*n)++; + return 0; +} + +static inline int +ebt_cleanup_match(struct ebt_entry_match *m, unsigned int *i) +{ + if (i && (*i)-- == 0) + return 1; + if (m->u.match->destroy) + m->u.match->destroy(m->data, m->match_size); + if (m->u.match->me) + __MOD_DEC_USE_COUNT(m->u.match->me); + + return 0; +} + +static inline int +ebt_cleanup_watcher(struct ebt_entry_watcher *w, unsigned int *i) +{ + if (i && (*i)-- == 0) + return 1; + if (w->u.watcher->destroy) + w->u.watcher->destroy(w->data, w->watcher_size); + if (w->u.watcher->me) + __MOD_DEC_USE_COUNT(w->u.watcher->me); + + return 0; +} + +static inline int +ebt_cleanup_entry(struct ebt_entry *e, unsigned int *cnt) +{ + struct ebt_entry_target *t; + + if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0) + return 0; + // we're done + if (cnt && (*cnt)-- == 0) + return 1; + EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, NULL); + EBT_MATCH_ITERATE(e, ebt_cleanup_match, NULL); + t = (struct ebt_entry_target *)(((char *)e) + e->target_offset); + if (t->u.target->destroy) + t->u.target->destroy(t->data, t->target_size); + if (t->u.target->me) + __MOD_DEC_USE_COUNT(t->u.target->me); + + return 0; +} + +static inline int +ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo, + const char *name, unsigned int *cnt, unsigned int valid_hooks, + struct ebt_cl_stack *cl_s, unsigned int udc_cnt) +{ + struct ebt_entry_target *t; + struct ebt_target *target; + unsigned int i, j, hook = 0, hookmask = 0; + int ret; + + // Don't mess with the struct ebt_entries + if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0) + return 0; + + if (e->bitmask & ~EBT_F_MASK) { + BUGPRINT("Unknown flag for bitmask\n"); + return -EINVAL; + } + if (e->invflags & ~EBT_INV_MASK) { + BUGPRINT("Unknown flag for inv bitmask\n"); + return -EINVAL; + } + if ( (e->bitmask & EBT_NOPROTO) && (e->bitmask & EBT_802_3) ) { + BUGPRINT("NOPROTO & 802_3 not allowed\n"); + return -EINVAL; + } + // what hook do we belong to? + for (i = 0; i < NF_BR_NUMHOOKS; i++) { + if ((valid_hooks & (1 << i)) == 0) + continue; + if ((char *)newinfo->hook_entry[i] < (char *)e) + hook = i; + else + break; + } + // (1 << NF_BR_NUMHOOKS) tells the check functions the rule is on + // a base chain + if (i < NF_BR_NUMHOOKS) + hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS); + else { + for (i = 0; i < udc_cnt; i++) + if ((char *)(cl_s[i].cs.chaininfo) > (char *)e) + break; + if (i == 0) + hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS); + else + hookmask = cl_s[i - 1].hookmask; + } + i = 0; + ret = EBT_MATCH_ITERATE(e, ebt_check_match, e, name, hookmask, &i); + if (ret != 0) + goto cleanup_matches; + j = 0; + ret = EBT_WATCHER_ITERATE(e, ebt_check_watcher, e, name, hookmask, &j); + if (ret != 0) + goto cleanup_watchers; + t = (struct ebt_entry_target *)(((char *)e) + e->target_offset); + target = find_target_lock(t->u.name, &ret, &ebt_mutex); + if (!target) + goto cleanup_watchers; + if (target->me) + __MOD_INC_USE_COUNT(target->me); + up(&ebt_mutex); + + t->u.target = target; + if (t->u.target == &ebt_standard_target) { + if (e->target_offset + sizeof(struct ebt_standard_target) > + e->next_offset) { + BUGPRINT("Standard target size too big\n"); + ret = -EFAULT; + goto cleanup_watchers; + } + if (((struct ebt_standard_target *)t)->verdict < + -NUM_STANDARD_TARGETS) { + BUGPRINT("Invalid standard target\n"); + ret = -EFAULT; + goto cleanup_watchers; + } + } else if ((e->target_offset + t->target_size + + sizeof(struct ebt_entry_target) > e->next_offset) || + (t->u.target->check && + t->u.target->check(name, hookmask, e, t->data, t->target_size) != 0)){ + if (t->u.target->me) + __MOD_DEC_USE_COUNT(t->u.target->me); + ret = -EFAULT; + goto cleanup_watchers; + } + (*cnt)++; + return 0; +cleanup_watchers: + EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, &j); +cleanup_matches: + EBT_MATCH_ITERATE(e, ebt_cleanup_match, &i); + return ret; +} + +// checks for loops and sets the hook mask for udc +// the hook mask for udc tells us from which base chains the udc can be +// accessed. This mask is a parameter to the check() functions of the extensions +static int check_chainloops(struct ebt_entries *chain, + struct ebt_cl_stack *cl_s, unsigned int udc_cnt, + unsigned int hooknr, char *base) +{ + int i, chain_nr = -1, pos = 0, nentries = chain->nentries, verdict; + struct ebt_entry *e = (struct ebt_entry *)chain->data; + struct ebt_entry_target *t; + + while (pos < nentries || chain_nr != -1) { + // end of udc, go back one 'recursion' step + if (pos == nentries) { + // put back values of the time when this chain was called + e = cl_s[chain_nr].cs.e; + if (cl_s[chain_nr].from != -1) + nentries = + cl_s[cl_s[chain_nr].from].cs.chaininfo->nentries; + else + nentries = chain->nentries; + pos = cl_s[chain_nr].cs.n; + // make sure we won't see a loop that isn't one + cl_s[chain_nr].cs.n = 0; + chain_nr = cl_s[chain_nr].from; + if (pos == nentries) + continue; + } + t = (struct ebt_entry_target *) + (((char *)e) + e->target_offset); + if (strcmp(t->u.name, EBT_STANDARD_TARGET)) + goto letscontinue; + if (e->target_offset + sizeof(struct ebt_standard_target) > + e->next_offset) { + BUGPRINT("Standard target size too big\n"); + return -1; + } + verdict = ((struct ebt_standard_target *)t)->verdict; + if (verdict >= 0) { // jump to another chain + struct ebt_entries *hlp2 = + (struct ebt_entries *)(base + verdict); + for (i = 0; i < udc_cnt; i++) + if (hlp2 == cl_s[i].cs.chaininfo) + break; + // bad destination or loop + if (i == udc_cnt) { + BUGPRINT("bad destination\n"); + return -1; + } + if (cl_s[i].cs.n) { + BUGPRINT("loop\n"); + return -1; + } + // this can't be 0, so the above test is correct + cl_s[i].cs.n = pos + 1; + pos = 0; + cl_s[i].cs.e = ((void *)e + e->next_offset); + e = (struct ebt_entry *)(hlp2->data); + nentries = hlp2->nentries; + cl_s[i].from = chain_nr; + chain_nr = i; + // this udc is accessible from the base chain for hooknr + cl_s[i].hookmask |= (1 << hooknr); + continue; + } +letscontinue: + e = (void *)e + e->next_offset; + pos++; + } + return 0; +} + +// do the parsing of the table/chains/entries/matches/watchers/targets, heh +static int translate_table(struct ebt_replace *repl, + struct ebt_table_info *newinfo) +{ + unsigned int i, j, k, udc_cnt; + int ret; + struct ebt_cl_stack *cl_s = NULL; // used in the checking for chain loops + + i = 0; + while (i < NF_BR_NUMHOOKS && !(repl->valid_hooks & (1 << i))) + i++; + if (i == NF_BR_NUMHOOKS) { + BUGPRINT("No valid hooks specified\n"); + return -EINVAL; + } + if (repl->hook_entry[i] != (struct ebt_entries *)repl->entries) { + BUGPRINT("Chains don't start at beginning\n"); + return -EINVAL; + } + // make sure chains are ordered after each other in same order + // as their corresponding hooks + for (j = i + 1; j < NF_BR_NUMHOOKS; j++) { + if (!(repl->valid_hooks & (1 << j))) + continue; + if ( repl->hook_entry[j] <= repl->hook_entry[i] ) { + BUGPRINT("Hook order must be followed\n"); + return -EINVAL; + } + i = j; + } + + for (i = 0; i < NF_BR_NUMHOOKS; i++) + newinfo->hook_entry[i] = NULL; + + newinfo->entries_size = repl->entries_size; + newinfo->nentries = repl->nentries; + + // do some early checkings and initialize some things + i = 0; // holds the expected nr. of entries for the chain + j = 0; // holds the up to now counted entries for the chain + k = 0; // holds the total nr. of entries, should equal + // newinfo->nentries afterwards + udc_cnt = 0; // will hold the nr. of user defined chains (udc) + ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, + ebt_check_entry_size_and_hooks, newinfo, repl->entries, + repl->entries + repl->entries_size, repl->hook_entry, &i, &j, &k, + &udc_cnt, repl->valid_hooks); + + if (ret != 0) + return ret; + + if (i != j) { + BUGPRINT("nentries does not equal the nr of entries in the " + "(last) chain\n"); + return -EINVAL; + } + if (k != newinfo->nentries) { + BUGPRINT("Total nentries is wrong\n"); + return -EINVAL; + } + + // check if all valid hooks have a chain + for (i = 0; i < NF_BR_NUMHOOKS; i++) { + if (newinfo->hook_entry[i] == NULL && + (repl->valid_hooks & (1 << i))) { + BUGPRINT("Valid hook without chain\n"); + return -EINVAL; + } + } + + // Get the location of the udc, put them in an array + // While we're at it, allocate the chainstack + if (udc_cnt) { + // this will get free'd in do_replace()/ebt_register_table() + // if an error occurs + newinfo->chainstack = (struct ebt_chainstack **) + vmalloc(smp_num_cpus * sizeof(struct ebt_chainstack)); + if (!newinfo->chainstack) + return -ENOMEM; + for (i = 0; i < smp_num_cpus; i++) { + newinfo->chainstack[i] = + vmalloc(udc_cnt * sizeof(struct ebt_chainstack)); + if (!newinfo->chainstack[i]) { + while (i) + vfree(newinfo->chainstack[--i]); + vfree(newinfo->chainstack); + newinfo->chainstack = NULL; + return -ENOMEM; + } + } + + cl_s = (struct ebt_cl_stack *) + vmalloc(udc_cnt * sizeof(struct ebt_cl_stack)); + if (!cl_s) + return -ENOMEM; + i = 0; // the i'th udc + EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, + ebt_get_udc_positions, newinfo, repl->hook_entry, &i, + repl->valid_hooks, cl_s); + // sanity check + if (i != udc_cnt) { + BUGPRINT("i != udc_cnt\n"); + vfree(cl_s); + return -EFAULT; + } + } + + // Check for loops + for (i = 0; i < NF_BR_NUMHOOKS; i++) + if (repl->valid_hooks & (1 << i)) + if (check_chainloops(newinfo->hook_entry[i], + cl_s, udc_cnt, i, newinfo->entries)) { + if (cl_s) + vfree(cl_s); + return -EINVAL; + } + + // we now know the following (along with E=mc²): + // - the nr of entries in each chain is right + // - the size of the allocated space is right + // - all valid hooks have a corresponding chain + // - there are no loops + // - wrong data can still be on the level of a single entry + // - could be there are jumps to places that are not the + // beginning of a chain. This can only occur in chains that + // are not accessible from any base chains, so we don't care. + + // used to know what we need to clean up if something goes wrong + i = 0; + ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, + ebt_check_entry, newinfo, repl->name, &i, repl->valid_hooks, + cl_s, udc_cnt); + if (ret != 0) { + EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, + ebt_cleanup_entry, &i); + } + if (cl_s) + vfree(cl_s); + return ret; +} + +// called under write_lock +static void get_counters(struct ebt_counter *oldcounters, + struct ebt_counter *counters, unsigned int nentries) +{ + int i, cpu; + struct ebt_counter *counter_base; + + // counters of cpu 0 + memcpy(counters, oldcounters, + sizeof(struct ebt_counter) * nentries); + // add other counters to those of cpu 0 + for (cpu = 1; cpu < smp_num_cpus; cpu++) { + counter_base = COUNTER_BASE(oldcounters, nentries, cpu); + for (i = 0; i < nentries; i++) { + counters[i].pcnt += counter_base[i].pcnt; + counters[i].bcnt += counter_base[i].bcnt; + } + } +} + +// replace the table +static int do_replace(void *user, unsigned int len) +{ + int ret, i, countersize; + struct ebt_table_info *newinfo; + struct ebt_replace tmp; + struct ebt_table *t; + struct ebt_counter *counterstmp = NULL; + // used to be able to unlock earlier + struct ebt_table_info *table; + + if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) + return -EFAULT; + + if (len != sizeof(tmp) + tmp.entries_size) { + BUGPRINT("Wrong len argument\n"); + return -EINVAL; + } + + if (tmp.entries_size == 0) { + BUGPRINT("Entries_size never zero\n"); + return -EINVAL; + } + countersize = COUNTER_OFFSET(tmp.nentries) * smp_num_cpus; + newinfo = (struct ebt_table_info *) + vmalloc(sizeof(struct ebt_table_info) + countersize); + if (!newinfo) + return -ENOMEM; + + if (countersize) + memset(newinfo->counters, 0, countersize); + + newinfo->entries = (char *)vmalloc(tmp.entries_size); + if (!newinfo->entries) { + ret = -ENOMEM; + goto free_newinfo; + } + if (copy_from_user( + newinfo->entries, tmp.entries, tmp.entries_size) != 0) { + BUGPRINT("Couldn't copy entries from userspace\n"); + ret = -EFAULT; + goto free_entries; + } + + // the user wants counters back + // the check on the size is done later, when we have the lock + if (tmp.num_counters) { + counterstmp = (struct ebt_counter *) + vmalloc(tmp.num_counters * sizeof(struct ebt_counter)); + if (!counterstmp) { + ret = -ENOMEM; + goto free_entries; + } + } + else + counterstmp = NULL; + + // this can get initialized by translate_table() + newinfo->chainstack = NULL; + ret = translate_table(&tmp, newinfo); + + if (ret != 0) + goto free_counterstmp; + + t = find_table_lock(tmp.name, &ret, &ebt_mutex); + if (!t) + goto free_iterate; + + // the table doesn't like it + if (t->check && (ret = t->check(newinfo, tmp.valid_hooks))) + goto free_unlock; + + if (tmp.num_counters && tmp.num_counters != t->private->nentries) { + BUGPRINT("Wrong nr. of counters requested\n"); + ret = -EINVAL; + goto free_unlock; + } + + // we have the mutex lock, so no danger in reading this pointer + table = t->private; + // we need an atomic snapshot of the counters + write_lock_bh(&t->lock); + if (tmp.num_counters) + get_counters(t->private->counters, counterstmp, + t->private->nentries); + + t->private = newinfo; + write_unlock_bh(&t->lock); + up(&ebt_mutex); + // So, a user can change the chains while having messed up her counter + // allocation. Only reason why this is done is because this way the lock + // is held only once, while this doesn't bring the kernel into a + // dangerous state. + if (tmp.num_counters && + copy_to_user(tmp.counters, counterstmp, + tmp.num_counters * sizeof(struct ebt_counter))) { + BUGPRINT("Couldn't copy counters to userspace\n"); + ret = -EFAULT; + } + else + ret = 0; + + // decrease module count and free resources + EBT_ENTRY_ITERATE(table->entries, table->entries_size, + ebt_cleanup_entry, NULL); + + vfree(table->entries); + if (table->chainstack) { + for (i = 0; i < smp_num_cpus; i++) + vfree(table->chainstack[i]); + vfree(table->chainstack); + } + vfree(table); + + if (counterstmp) + vfree(counterstmp); + return ret; + +free_unlock: + up(&ebt_mutex); +free_iterate: + EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, + ebt_cleanup_entry, NULL); +free_counterstmp: + if (counterstmp) + vfree(counterstmp); + // can be initialized in translate_table() + if (newinfo->chainstack) { + for (i = 0; i < smp_num_cpus; i++) + vfree(newinfo->chainstack[i]); + vfree(newinfo->chainstack); + } +free_entries: + if (newinfo->entries) + vfree(newinfo->entries); +free_newinfo: + if (newinfo) + vfree(newinfo); + return ret; +} + +int ebt_register_target(struct ebt_target *target) +{ + int ret; + + ret = down_interruptible(&ebt_mutex); + if (ret != 0) + return ret; + if (!list_named_insert(&ebt_targets, target)) { + up(&ebt_mutex); + return -EEXIST; + } + up(&ebt_mutex); + MOD_INC_USE_COUNT; + + return 0; +} + +void ebt_unregister_target(struct ebt_target *target) +{ + down(&ebt_mutex); + LIST_DELETE(&ebt_targets, target); + up(&ebt_mutex); + MOD_DEC_USE_COUNT; +} + +int ebt_register_match(struct ebt_match *match) +{ + int ret; + + ret = down_interruptible(&ebt_mutex); + if (ret != 0) + return ret; + if (!list_named_insert(&ebt_matches, match)) { + up(&ebt_mutex); + return -EEXIST; + } + up(&ebt_mutex); + MOD_INC_USE_COUNT; + + return 0; +} + +void ebt_unregister_match(struct ebt_match *match) +{ + down(&ebt_mutex); + LIST_DELETE(&ebt_matches, match); + up(&ebt_mutex); + MOD_DEC_USE_COUNT; +} + +int ebt_register_watcher(struct ebt_watcher *watcher) +{ + int ret; + + ret = down_interruptible(&ebt_mutex); + if (ret != 0) + return ret; + if (!list_named_insert(&ebt_watchers, watcher)) { + up(&ebt_mutex); + return -EEXIST; + } + up(&ebt_mutex); + MOD_INC_USE_COUNT; + + return 0; +} + +void ebt_unregister_watcher(struct ebt_watcher *watcher) +{ + down(&ebt_mutex); + LIST_DELETE(&ebt_watchers, watcher); + up(&ebt_mutex); + MOD_DEC_USE_COUNT; +} + +int ebt_register_table(struct ebt_table *table) +{ + struct ebt_table_info *newinfo; + int ret, i, countersize; + + if (!table || !table->table ||!table->table->entries || + table->table->entries_size == 0 || + table->table->counters || table->private) { + BUGPRINT("Bad table data for ebt_register_table!!!\n"); + return -EINVAL; + } + + countersize = COUNTER_OFFSET(table->table->nentries) * smp_num_cpus; + newinfo = (struct ebt_table_info *) + vmalloc(sizeof(struct ebt_table_info) + countersize); + ret = -ENOMEM; + if (!newinfo) + return -ENOMEM; + + newinfo->entries = (char *)vmalloc(table->table->entries_size); + if (!(newinfo->entries)) + goto free_newinfo; + + memcpy(newinfo->entries, table->table->entries, + table->table->entries_size); + + if (countersize) + memset(newinfo->counters, 0, countersize); + + // fill in newinfo and parse the entries + newinfo->chainstack = NULL; + ret = translate_table(table->table, newinfo); + if (ret != 0) { + BUGPRINT("Translate_table failed\n"); + goto free_chainstack; + } + + if (table->check && table->check(newinfo, table->valid_hooks)) { + BUGPRINT("The table doesn't like its own initial data, lol\n"); + return -EINVAL; + } + + table->private = newinfo; + table->lock = RW_LOCK_UNLOCKED; + ret = down_interruptible(&ebt_mutex); + if (ret != 0) + goto free_chainstack; + + if (list_named_find(&ebt_tables, table->name)) { + ret = -EEXIST; + BUGPRINT("Table name already exists\n"); + goto free_unlock; + } + + list_prepend(&ebt_tables, table); + up(&ebt_mutex); + MOD_INC_USE_COUNT; + return 0; +free_unlock: + up(&ebt_mutex); +free_chainstack: + if (newinfo->chainstack) { + for (i = 0; i < smp_num_cpus; i++) + vfree(newinfo->chainstack[i]); + vfree(newinfo->chainstack); + } + vfree(newinfo->entries); +free_newinfo: + vfree(newinfo); + return ret; +} + +void ebt_unregister_table(struct ebt_table *table) +{ + int i; + + if (!table) { + BUGPRINT("Request to unregister NULL table!!!\n"); + return; + } + down(&ebt_mutex); + LIST_DELETE(&ebt_tables, table); + up(&ebt_mutex); + EBT_ENTRY_ITERATE(table->private->entries, + table->private->entries_size, ebt_cleanup_entry, NULL); + if (table->private->entries) + vfree(table->private->entries); + if (table->private->chainstack) { + for (i = 0; i < smp_num_cpus; i++) + vfree(table->private->chainstack[i]); + vfree(table->private->chainstack); + } + vfree(table->private); + MOD_DEC_USE_COUNT; +} + +// userspace just supplied us with counters +static int update_counters(void *user, unsigned int len) +{ + int i, ret; + struct ebt_counter *tmp; + struct ebt_replace hlp; + struct ebt_table *t; + + if (copy_from_user(&hlp, user, sizeof(hlp))) + return -EFAULT; + + if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter)) + return -EINVAL; + if (hlp.num_counters == 0) + return -EINVAL; + + if ( !(tmp = (struct ebt_counter *) + vmalloc(hlp.num_counters * sizeof(struct ebt_counter))) ){ + MEMPRINT("Update_counters && nomemory\n"); + return -ENOMEM; + } + + t = find_table_lock(hlp.name, &ret, &ebt_mutex); + if (!t) + goto free_tmp; + + if (hlp.num_counters != t->private->nentries) { + BUGPRINT("Wrong nr of counters\n"); + ret = -EINVAL; + goto unlock_mutex; + } + + if ( copy_from_user(tmp, hlp.counters, + hlp.num_counters * sizeof(struct ebt_counter)) ) { + BUGPRINT("Updata_counters && !cfu\n"); + ret = -EFAULT; + goto unlock_mutex; + } + + // we want an atomic add of the counters + write_lock_bh(&t->lock); + + // we add to the counters of the first cpu + for (i = 0; i < hlp.num_counters; i++) { + t->private->counters[i].pcnt += tmp[i].pcnt; + t->private->counters[i].bcnt += tmp[i].bcnt; + } + + write_unlock_bh(&t->lock); + ret = 0; +unlock_mutex: + up(&ebt_mutex); +free_tmp: + vfree(tmp); + return ret; +} + +static inline int ebt_make_matchname(struct ebt_entry_match *m, + char *base, char *ubase) +{ + char *hlp = ubase - base + (char *)m; + if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN)) + return -EFAULT; + return 0; +} + +static inline int ebt_make_watchername(struct ebt_entry_watcher *w, + char *base, char *ubase) +{ + char *hlp = ubase - base + (char *)w; + if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN)) + return -EFAULT; + return 0; +} + +static inline int ebt_make_names(struct ebt_entry *e, char *base, char *ubase) +{ + int ret; + char *hlp; + struct ebt_entry_target *t; + + if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0) + return 0; + + hlp = ubase - base + (char *)e + e->target_offset; + t = (struct ebt_entry_target *)(((char *)e) + e->target_offset); + + ret = EBT_MATCH_ITERATE(e, ebt_make_matchname, base, ubase); + if (ret != 0) + return ret; + ret = EBT_WATCHER_ITERATE(e, ebt_make_watchername, base, ubase); + if (ret != 0) + return ret; + if (copy_to_user(hlp, t->u.target->name, EBT_FUNCTION_MAXNAMELEN)) + return -EFAULT; + return 0; +} + +// called with ebt_mutex down +static int copy_everything_to_user(struct ebt_table *t, void *user, + int *len, int cmd) +{ + struct ebt_replace tmp; + struct ebt_counter *counterstmp, *oldcounters; + unsigned int entries_size, nentries; + char *entries; + + if (cmd == EBT_SO_GET_ENTRIES) { + entries_size = t->private->entries_size; + nentries = t->private->nentries; + entries = t->private->entries; + oldcounters = t->private->counters; + } else { + entries_size = t->table->entries_size; + nentries = t->table->nentries; + entries = t->table->entries; + oldcounters = t->table->counters; + } + + if (copy_from_user(&tmp, user, sizeof(tmp))) { + BUGPRINT("Cfu didn't work\n"); + return -EFAULT; + } + + if (*len != sizeof(struct ebt_replace) + entries_size + + (tmp.num_counters? nentries * sizeof(struct ebt_counter): 0)) { + BUGPRINT("Wrong size\n"); + return -EINVAL; + } + + if (tmp.nentries != nentries) { + BUGPRINT("Nentries wrong\n"); + return -EINVAL; + } + + if (tmp.entries_size != entries_size) { + BUGPRINT("Wrong size\n"); + return -EINVAL; + } + + // userspace might not need the counters + if (tmp.num_counters) { + if (tmp.num_counters != nentries) { + BUGPRINT("Num_counters wrong\n"); + return -EINVAL; + } + counterstmp = (struct ebt_counter *) + vmalloc(nentries * sizeof(struct ebt_counter)); + if (!counterstmp) { + MEMPRINT("Couldn't copy counters, out of memory\n"); + return -ENOMEM; + } + write_lock_bh(&t->lock); + get_counters(oldcounters, counterstmp, nentries); + write_unlock_bh(&t->lock); + + if (copy_to_user(tmp.counters, counterstmp, + nentries * sizeof(struct ebt_counter))) { + BUGPRINT("Couldn't copy counters to userspace\n"); + vfree(counterstmp); + return -EFAULT; + } + vfree(counterstmp); + } + + if (copy_to_user(tmp.entries, entries, entries_size)) { + BUGPRINT("Couldn't copy entries to userspace\n"); + return -EFAULT; + } + // set the match/watcher/target names right + return EBT_ENTRY_ITERATE(entries, entries_size, + ebt_make_names, entries, tmp.entries); +} + +static int do_ebt_set_ctl(struct sock *sk, + int cmd, void *user, unsigned int len) +{ + int ret; + + switch(cmd) { + case EBT_SO_SET_ENTRIES: + ret = do_replace(user, len); + break; + case EBT_SO_SET_COUNTERS: + ret = update_counters(user, len); + break; + default: + ret = -EINVAL; + } + return ret; +} + +static int do_ebt_get_ctl(struct sock *sk, int cmd, void *user, int *len) +{ + int ret; + struct ebt_replace tmp; + struct ebt_table *t; + + if (copy_from_user(&tmp, user, sizeof(tmp))) + return -EFAULT; + + t = find_table_lock(tmp.name, &ret, &ebt_mutex); + if (!t) + return ret; + + switch(cmd) { + case EBT_SO_GET_INFO: + case EBT_SO_GET_INIT_INFO: + if (*len != sizeof(struct ebt_replace)){ + ret = -EINVAL; + up(&ebt_mutex); + break; + } + if (cmd == EBT_SO_GET_INFO) { + tmp.nentries = t->private->nentries; + tmp.entries_size = t->private->entries_size; + tmp.valid_hooks = t->valid_hooks; + } else { + tmp.nentries = t->table->nentries; + tmp.entries_size = t->table->entries_size; + tmp.valid_hooks = t->table->valid_hooks; + } + up(&ebt_mutex); + if (copy_to_user(user, &tmp, *len) != 0){ + BUGPRINT("c2u Didn't work\n"); + ret = -EFAULT; + break; + } + ret = 0; + break; + + case EBT_SO_GET_ENTRIES: + case EBT_SO_GET_INIT_ENTRIES: + ret = copy_everything_to_user(t, user, len, cmd); + up(&ebt_mutex); + break; + + default: + up(&ebt_mutex); + ret = -EINVAL; + } + + return ret; +} + +static struct nf_sockopt_ops ebt_sockopts = +{ { NULL, NULL }, PF_INET, EBT_BASE_CTL, EBT_SO_SET_MAX + 1, do_ebt_set_ctl, + EBT_BASE_CTL, EBT_SO_GET_MAX + 1, do_ebt_get_ctl, 0, NULL +}; + +static int __init init(void) +{ + int ret; + + down(&ebt_mutex); + list_named_insert(&ebt_targets, &ebt_standard_target); + up(&ebt_mutex); + if ((ret = nf_register_sockopt(&ebt_sockopts)) < 0) + return ret; + + printk(KERN_NOTICE "Ebtables v2.0 registered\n"); + return 0; +} + +static void __exit fini(void) +{ + nf_unregister_sockopt(&ebt_sockopts); + printk(KERN_NOTICE "Ebtables v2.0 unregistered\n"); +} + +EXPORT_SYMBOL(ebt_register_table); +EXPORT_SYMBOL(ebt_unregister_table); +EXPORT_SYMBOL(ebt_register_match); +EXPORT_SYMBOL(ebt_unregister_match); +EXPORT_SYMBOL(ebt_register_watcher); +EXPORT_SYMBOL(ebt_unregister_watcher); +EXPORT_SYMBOL(ebt_register_target); +EXPORT_SYMBOL(ebt_unregister_target); +EXPORT_SYMBOL(ebt_do_table); +module_init(init); +module_exit(fini); +MODULE_LICENSE("GPL"); --- /dev/null 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebtables.h 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,361 @@ +/* + * ebtables + * + * Authors: + * Bart De Schuymer + * + * 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 +#include +#include + +#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, 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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_among.h 2003-12-15 21:29:45.000000000 +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 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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_limit.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_arpreply.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_802_3.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_arp.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_ip.h 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,43 @@ +/* + * ebt_ip + * + * Authors: + * Bart De Schuymer + * + * April, 2002 + * + * Changes: + * added ip-sport and ip-dport + * Innominate Security Technologies AG + * 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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_pkttype.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_stp.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_vlan.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_log.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_nat.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_redirect.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_mark_m.h 2003-12-15 21:29:45.000000000 +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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_bridge/ebt_mark_t.h 2003-12-15 21:29:45.000000000 +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-2.4.23/include/linux/netfilter.h 2003-08-25 13:44:44.000000000 +0200 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter.h 2003-12-15 21:29:45.000000000 +0100 @@ -118,17 +118,23 @@ 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) \ +nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN) +#define NF_HOOK_THRESH nf_hook_slow #else #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \ (list_empty(&nf_hooks[(pf)][(hook)]) \ ? (okfn)(skb) \ - : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn))) + : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN)) +#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \ +(list_empty(&nf_hooks[(pf)][(hook)]) \ + ? (okfn)(skb) \ + : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), (thresh))) #endif int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, - int (*okfn)(struct sk_buff *)); + int (*okfn)(struct sk_buff *), int thresh); /* Call setsockopt() */ int nf_setsockopt(struct sock *sk, int pf, int optval, char *opt, --- linux-2.4.23/include/linux/netfilter_ipv4.h 2002-02-25 20:38:13.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_ipv4.h 2003-12-15 21:29:45.000000000 +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-2.4.23/include/linux/skbuff.h 2003-08-25 13:44:44.000000000 +0200 +++ linux-2.4.23-ebt-brnf/include/linux/skbuff.h 2003-12-15 21:29:45.000000000 +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 hh[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) @@ -1169,6 +1186,20 @@ nf_conntrack_get(struct nf_ct_info *nfct if (nfct) atomic_inc(&nfct->master->use); } + +#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) +static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge) +{ + if (nf_bridge && atomic_dec_and_test(&nf_bridge->use)) + kfree(nf_bridge); +} +static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge) +{ + if (nf_bridge) + atomic_inc(&nf_bridge->use); +} +#endif + #endif #endif /* __KERNEL__ */ --- linux-2.4.23/net/core/netfilter.c 2003-08-25 13:44:44.000000000 +0200 +++ linux-2.4.23-ebt-brnf/net/core/netfilter.c 2003-12-15 21:29:45.000000000 +0100 @@ -342,10 +342,15 @@ 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) { for (*i = (*i)->next; *i != head; *i = (*i)->next) { struct nf_hook_ops *elem = (struct nf_hook_ops *)*i; + + if (hook_thresh > elem->priority) + continue; + switch (elem->hook(hook, skb, indev, outdev, okfn)) { case NF_QUEUE: return NF_QUEUE; @@ -413,6 +418,10 @@ 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); @@ -435,11 +444,24 @@ 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; @@ -449,7 +471,8 @@ static void nf_queue(struct sk_buff *skb int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, - int (*okfn)(struct sk_buff *)) + int (*okfn)(struct sk_buff *), + int hook_thresh) { struct list_head *elem; unsigned int verdict; @@ -481,7 +504,7 @@ int nf_hook_slow(int pf, unsigned int ho elem = &nf_hooks[pf][hook]; verdict = nf_iterate(&nf_hooks[pf][hook], &skb, hook, indev, - outdev, &elem, okfn); + outdev, &elem, okfn, hook_thresh); if (verdict == NF_QUEUE) { NFDEBUG("nf_hook: Verdict = QUEUE.\n"); nf_queue(skb, elem, pf, hook, indev, outdev, okfn); @@ -510,6 +533,14 @@ 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 +561,7 @@ 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-2.4.23/net/core/skbuff.c 2003-08-25 13:44:44.000000000 +0200 +++ linux-2.4.23-ebt-brnf/net/core/skbuff.c 2003-12-15 21:29:45.000000000 +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-2.4.23/net/ipv4/netfilter/ip_tables.c 2003-08-25 13:44:44.000000000 +0200 +++ linux-2.4.23-ebt-brnf/net/ipv4/netfilter/ip_tables.c 2003-12-15 21:29:45.000000000 +0100 @@ -121,12 +121,19 @@ 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)) @@ -156,7 +163,15 @@ 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)":""); @@ -169,7 +184,15 @@ 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)":""); @@ -268,6 +291,9 @@ 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; @@ -277,6 +303,13 @@ 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 @@ -312,7 +345,15 @@ 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-2.4.23/net/ipv4/ip_output.c 2003-11-28 19:26:21.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/ipv4/ip_output.c 2003-12-15 21:29:45.000000000 +0100 @@ -883,6 +883,10 @@ 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-2.4.23/net/ipv4/netfilter/ipt_LOG.c 2003-11-28 19:26:21.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/ipv4/netfilter/ipt_LOG.c 2003-12-15 21:29:45.000000000 +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-2.4.23/net/ipv4/netfilter/Makefile 2003-08-25 13:44:44.000000000 +0200 +++ linux-2.4.23-ebt-brnf/net/ipv4/netfilter/Makefile 2003-12-15 21:29:45.000000000 +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-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o --- linux-2.4.23/net/ipv4/netfilter/Config.in 2003-08-25 13:44:44.000000000 +0200 +++ linux-2.4.23-ebt-brnf/net/ipv4/netfilter/Config.in 2003-12-15 21:29:45.000000000 +0100 @@ -44,6 +44,9 @@ if [ "$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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/bridge/br_netfilter.c 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,720 @@ +/* + * Handle firewalling + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek + * Bart De Schuymer (maintainer) + * + * 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) + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "br_private.h" + + +#define skb_origaddr(skb) (((struct bridge_skb_cb *) \ + (skb->cb))->daddr.ipv4) +#define store_orig_dstaddr(skb) (skb_origaddr(skb) = (skb)->nh.iph->daddr) +#define dnat_took_place(skb) (skb_origaddr(skb) != (skb)->nh.iph->daddr) +#define clear_cb(skb) (memset(&skb_origaddr(skb), 0, \ + sizeof(struct bridge_skb_cb))) + +#define has_bridge_parent(device) ((device)->br_port != NULL) +#define bridge_parent(device) (&((device)->br_port->br->dev)) + +#define IS_VLAN_IP (skb->protocol == __constant_htons(ETH_P_8021Q) && \ + hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_IP)) + +/* We need these fake structures to make netfilter happy -- + * lots of places assume that skb->dst != NULL, which isn't + * all that unreasonable. + * + * Currently, we fill in the PMTU entry because netfilter + * refragmentation needs it, and the rt_flags entry because + * ipt_REJECT needs it. Future netfilter modules might + * require us to fill additional fields. + */ +static struct net_device __fake_net_device = { + .hard_header_len = ETH_HLEN +}; + +static struct rtable __fake_rtable = { + u: { + dst: { + __refcnt: ATOMIC_INIT(1), + dev: &__fake_net_device, + pmtu: 1500 + } + }, + + rt_flags: 0 +}; + + +/* PF_BRIDGE/PRE_ROUTING *********************************************/ +static void __br_dnat_complain(void) +{ + static unsigned long last_complaint; + + 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; + clear_cb(skb); + 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); + } + + clear_cb(skb); + 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; +} + +/* 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; + + if (skb->protocol != __constant_htons(ETH_P_IP)) { + struct vlan_ethhdr *hdr = (struct vlan_ethhdr *) + ((*pskb)->mac.ethernet); + + if (!IS_VLAN_IP) + return NF_ACCEPT; + if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) + goto out; + skb_pull(*pskb, VLAN_HLEN); + (*pskb)->nh.raw += VLAN_HLEN; + } else if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) + goto out; + + if (!pskb_may_pull(skb, sizeof(struct iphdr))) + goto inhdr_error; + + iph = skb->nh.iph; + if (iph->ihl < 5 || iph->version != 4) + goto inhdr_error; + + if (!pskb_may_pull(skb, 4*iph->ihl)) + goto inhdr_error; + + iph = skb->nh.iph; + if (ip_fast_csum((__u8 *)iph, iph->ihl) != 0) + goto inhdr_error; + + len = ntohs(iph->tot_len); + if (skb->len < len || len < 4*iph->ihl) + goto inhdr_error; + + if (skb->len > len) { + __pskb_trim(skb, len); + if (skb->ip_summed == CHECKSUM_HW) + skb->ip_summed = CHECKSUM_NONE; + } + +#ifdef CONFIG_NETFILTER_DEBUG + skb->nf_debug ^= (1 << NF_IP_PRE_ROUTING); +#endif + if ((nf_bridge = nf_bridge_alloc(skb)) == NULL) + return NF_DROP; + + if (skb->pkt_type == PACKET_OTHERHOST) { + skb->pkt_type = PACKET_HOST; + nf_bridge->mask |= BRNF_PKT_TYPE; + } + + nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; + nf_bridge->physindev = skb->dev; + skb->dev = bridge_parent(skb->dev); + store_orig_dstaddr(skb); + + NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL, + br_nf_pre_routing_finish); + + return NF_STOLEN; + +inhdr_error: +// IP_INC_STATS_BH(IpInHdrErrors); +out: + return NF_DROP; +} + + +/* PF_BRIDGE/LOCAL_IN ************************************************/ +/* The packet is locally destined, which requires a real + * dst_entry, so detach the fake one. On the way up, the + * packet would pass through PRE_ROUTING again (which already + * took place when the packet entered the bridge), but we + * register an IPv4 PRE_ROUTING 'sabotage' hook that will + * prevent this from happening. + */ +static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb, + const struct net_device *in, const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + struct sk_buff *skb = *pskb; + + if (skb->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_IP) || IS_VLAN_IP) { + 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. + */ +static unsigned int br_nf_forward(unsigned int hook, struct sk_buff **pskb, + const struct net_device *in, const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + struct sk_buff *skb = *pskb; + struct nf_bridge_info *nf_bridge; + struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet); + + if (skb->protocol != __constant_htons(ETH_P_IP)) { + if (!IS_VLAN_IP) + 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 + 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_INET, NF_IP_FORWARD, skb, bridge_parent(in), + bridge_parent(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 *)) +{ + int (*okfn)(struct sk_buff *skb); + struct net_device *realindev; + struct sk_buff *skb = *pskb; + struct nf_bridge_info *nf_bridge; + struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet); + + if (skb->protocol != __constant_htons(ETH_P_IP) && !IS_VLAN_IP) + return NF_ACCEPT; + + /* Sometimes we get packets with NULL ->dst here (for example, + * running a dhcp client daemon triggers this). + */ + if (skb->dst == NULL) + return NF_ACCEPT; + + nf_bridge = skb->nf_bridge; + nf_bridge->physoutdev = skb->dev; + + realindev = nf_bridge->physindev; + + /* Bridged, take PF_BRIDGE/FORWARD. + * (see big note in front of br_nf_pre_routing_finish) + */ + if (nf_bridge->mask & BRNF_BRIDGED_DNAT) { + okfn = br_forward_finish; + + if (nf_bridge->mask & BRNF_PKT_TYPE) { + skb->pkt_type = PACKET_OTHERHOST; + nf_bridge->mask ^= BRNF_PKT_TYPE; + } + 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, okfn); + } else { + struct net_device *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 + okfn = br_nf_local_out_finish; + 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_INET, 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_INET, NF_IP_LOCAL_OUT, skb, realindev, + realoutdev, okfn, + NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1); + } + } + + return NF_STOLEN; +} + + +/* PF_BRIDGE/POST_ROUTING ********************************************/ +static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb, + const struct net_device *in, const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + struct sk_buff *skb = *pskb; + struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge; + struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet); + struct net_device *realoutdev = bridge_parent(skb->dev); + + /* Be very paranoid. Must be a device driver bug. */ + if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) { + printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " + "bad mac.raw pointer."); + if (skb->dev != NULL) { + printk("[%s]", skb->dev->name); + if (has_bridge_parent(skb->dev)) + printk("[%s]", bridge_parent(skb->dev)->name); + } + printk(" head:%p, raw:%p\n", skb->head, skb->mac.raw); + return NF_ACCEPT; + } + + if (skb->protocol != __constant_htons(ETH_P_IP) && !IS_VLAN_IP) + return NF_ACCEPT; + + /* Sometimes we get packets with NULL ->dst here (for example, + * running a dhcp client daemon triggers this). + */ + if (skb->dst == NULL) + return NF_ACCEPT; + +#ifdef CONFIG_NETFILTER_DEBUG + skb->nf_debug ^= (1 << NF_IP_POST_ROUTING); +#endif + + /* We assume any code from br_dev_queue_push_xmit onwards doesn't care + * about the value of skb->pkt_type. + */ + if (skb->pkt_type == PACKET_OTHERHOST) { + skb->pkt_type = PACKET_HOST; + nf_bridge->mask |= BRNF_PKT_TYPE; + } + + 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_INET, NF_IP_POST_ROUTING, skb, NULL, + realoutdev, br_dev_queue_push_xmit); + + return NF_STOLEN; +} + + +/* IPv4/SABOTAGE *****************************************************/ + +/* Don't hand locally destined packets to PF_INET/PRE_ROUTING + * for the second time. + */ +static unsigned int ipv4_sabotage_in(unsigned int hook, struct sk_buff **pskb, + const struct net_device *in, const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + if ((*pskb)->nf_bridge && + !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { + okfn(*pskb); + return NF_STOLEN; + } + + return NF_ACCEPT; +} + +/* Postpone execution of PF_INET/FORWARD, PF_INET/LOCAL_OUT + * and PF_INET/POST_ROUTING until we have done the forwarding + * decision in the bridge code and have determined skb->physoutdev. + */ +static unsigned int ipv4_sabotage_out(unsigned int hook, struct sk_buff **pskb, + const struct net_device *in, const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + if ((out->hard_start_xmit == br_dev_xmit && + okfn != br_nf_forward_finish && + okfn != br_nf_local_out_finish && + okfn != br_dev_queue_push_xmit) +#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 sk_buff *skb = *pskb; + struct nf_bridge_info *nf_bridge; + + if (!skb->nf_bridge && !nf_bridge_alloc(skb)) + return NF_DROP; + + nf_bridge = skb->nf_bridge; + + /* This frame will arrive on PF_BRIDGE/LOCAL_OUT and we + * will need the indev then. For a brouter, the real indev + * can be a bridge port, so we make sure br_nf_local_out() + * doesn't use the bridge parent of the indev by using + * the BRNF_DONT_TAKE_PARENT mask. + */ + if (hook == NF_IP_FORWARD && nf_bridge->physindev == NULL) { + nf_bridge->mask &= BRNF_DONT_TAKE_PARENT; + nf_bridge->physindev = (struct net_device *)in; + } +#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 + okfn(skb); + return NF_STOLEN; + } + + return NF_ACCEPT; +} + +/* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent + * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. + * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because + * ip_refrag() can return NF_STOLEN. + */ +static struct nf_hook_ops br_nf_ops[] = { + { .hook = br_nf_pre_routing, + .pf = PF_BRIDGE, + .hooknum = NF_BR_PRE_ROUTING, + .priority = NF_BR_PRI_BRNF, }, + { .hook = br_nf_local_in, + .pf = PF_BRIDGE, + .hooknum = NF_BR_LOCAL_IN, + .priority = NF_BR_PRI_BRNF, }, + { .hook = br_nf_forward, + .pf = PF_BRIDGE, + .hooknum = NF_BR_FORWARD, + .priority = NF_BR_PRI_BRNF, }, + { .hook = br_nf_local_out, + .pf = PF_BRIDGE, + .hooknum = NF_BR_LOCAL_OUT, + .priority = NF_BR_PRI_FIRST, }, + { .hook = br_nf_post_routing, + .pf = PF_BRIDGE, + .hooknum = NF_BR_POST_ROUTING, + .priority = NF_BR_PRI_LAST, }, + { .hook = ipv4_sabotage_in, + .pf = PF_INET, + .hooknum = NF_IP_PRE_ROUTING, + .priority = NF_IP_PRI_FIRST, }, + { .hook = ipv4_sabotage_out, + .pf = PF_INET, + .hooknum = NF_IP_FORWARD, + .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, }, + { .hook = ipv4_sabotage_out, + .pf = PF_INET, + .hooknum = NF_IP_LOCAL_OUT, + .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, }, + { .hook = ipv4_sabotage_out, + .pf = PF_INET, + .hooknum = NF_IP_POST_ROUTING, + .priority = NF_IP_PRI_FIRST, }, +}; + +int br_netfilter_init(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) { + int ret; + + if ((ret = nf_register_hook(&br_nf_ops[i])) >= 0) + continue; + + while (i--) + nf_unregister_hook(&br_nf_ops[i]); + + return ret; + } + + printk(KERN_NOTICE "Bridge firewalling registered\n"); + + return 0; +} + +void br_netfilter_fini(void) +{ + int i; + + for (i = ARRAY_SIZE(br_nf_ops) - 1; i >= 0; i--) + nf_unregister_hook(&br_nf_ops[i]); +} --- /dev/null 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/ipv4/netfilter/ipt_physdev.c 2003-12-15 21:29:45.000000000 +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 +#include +#include +#include +#include +#include +#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 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.23-ebt-brnf/include/linux/netfilter_ipv4/ipt_physdev.h 2003-12-15 21:29:45.000000000 +0100 @@ -0,0 +1,24 @@ +#ifndef _IPT_PHYSDEV_H +#define _IPT_PHYSDEV_H + +#ifdef __KERNEL__ +#include +#endif + +#define IPT_PHYSDEV_OP_IN 0x01 +#define IPT_PHYSDEV_OP_OUT 0x02 +#define IPT_PHYSDEV_OP_BRIDGED 0x04 +#define IPT_PHYSDEV_OP_ISIN 0x08 +#define IPT_PHYSDEV_OP_ISOUT 0x10 +#define IPT_PHYSDEV_OP_MASK (0x20 - 1) + +struct ipt_physdev_info { + u_int8_t invert; + u_int8_t bitmask; + char physindev[IFNAMSIZ]; + char in_mask[IFNAMSIZ]; + char physoutdev[IFNAMSIZ]; + char out_mask[IFNAMSIZ]; +}; + +#endif /*_IPT_PHYSDEV_H*/ --- linux-2.4.23/net/8021q/vlan_dev.c 2003-11-28 19:26:21.000000000 +0100 +++ linux-2.4.23-ebt-brnf/net/8021q/vlan_dev.c 2003-12-15 21:29:45.000000000 +0100 @@ -507,6 +507,10 @@ 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; + dev_queue_xmit(skb); return 0;