1 #ifndef __LINUX_BRIDGE_NETFILTER_H 2 #define __LINUX_BRIDGE_NETFILTER_H 3 4 /* bridge-specific defines for netfilter. 5 */ 6 7 #include <linux/netfilter.h> 8 #if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER) 9 #include <asm/atomic.h> 10 #include <linux/if_ether.h> 11 #endif 12 13 /* Bridge Hooks */ 14 /* After promisc drops, checksum checks. */ 15 #define NF_BR_PRE_ROUTING 0 16 /* If the packet is destined for this box. */ 17 #define NF_BR_LOCAL_IN 1 18 /* If the packet is destined for another interface. */ 19 #define NF_BR_FORWARD 2 20 /* Packets coming from a local process. */ 21 #define NF_BR_LOCAL_OUT 3 22 /* Packets about to hit the wire. */ 23 #define NF_BR_POST_ROUTING 4 24 /* Not really a hook, but used for the ebtables broute table */ 25 #define NF_BR_BROUTING 5 26 #define NF_BR_NUMHOOKS 6 27 28 #ifdef __KERNEL__ 29 30 enum nf_br_hook_priorities { 31 NF_BR_PRI_FIRST = INT_MIN, 32 NF_BR_PRI_NAT_DST_BRIDGED = -300, 33 NF_BR_PRI_FILTER_BRIDGED = -200, 34 NF_BR_PRI_BRNF = 0, 35 NF_BR_PRI_NAT_DST_OTHER = 100, 36 NF_BR_PRI_FILTER_OTHER = 200, 37 NF_BR_PRI_NAT_SRC = 300, 38 NF_BR_PRI_LAST = INT_MAX, 39 }; 40 41 #ifdef CONFIG_BRIDGE_NETFILTER 42 43 #define BRNF_PKT_TYPE 0x01 44 #define BRNF_BRIDGED_DNAT 0x02 45 #define BRNF_DONT_TAKE_PARENT 0x04 46 #define BRNF_BRIDGED 0x08 47 #define BRNF_NF_BRIDGE_PREROUTING 0x10 48 49 50 /* Only used in br_forward.c */ 51 static inline 52 void nf_bridge_maybe_copy_header(struct sk_buff *skb) 53 { 54 if (skb->nf_bridge) { 55 if (skb->protocol == __constant_htons(ETH_P_8021Q)) { 56 memcpy(skb->data - 18, skb->nf_bridge->data, 18); 57 skb_push(skb, 4); 58 } else 59 memcpy(skb->data - 16, skb->nf_bridge->data, 16); 60 } 61 } 62 63 /* This is called by the IP fragmenting code and it ensures there is 64 * enough room for the encapsulating header (if there is one). */ 65 static inline 66 int nf_bridge_pad(struct sk_buff *skb) 67 { 68 if (skb->protocol == __constant_htons(ETH_P_IP)) 69 return 0; 70 if (skb->nf_bridge) { 71 if (skb->protocol == __constant_htons(ETH_P_8021Q)) 72 return 4; 73 } 74 return 0; 75 } 76 77 struct bridge_skb_cb { 78 union { 79 __u32 ipv4; 80 } daddr; 81 }; 82 #endif /* CONFIG_BRIDGE_NETFILTER */ 83 84 #endif /* __KERNEL__ */ 85 #endif 86