1 #ifndef __LINUX_BRIDGE_NETFILTER_H 2 #define __LINUX_BRIDGE_NETFILTER_H 3 4 /* bridge-specific defines for netfilter. 5 */ 6 7 #include <linux/config.h> 8 #include <linux/netfilter.h> 9 #if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER) 10 #include <asm/atomic.h> 11 #include <linux/if_ether.h> 12 #endif 13 14 /* Bridge Hooks */ 15 /* After promisc drops, checksum checks. */ 16 #define NF_BR_PRE_ROUTING 0 17 /* If the packet is destined for this box. */ 18 #define NF_BR_LOCAL_IN 1 19 /* If the packet is destined for another interface. */ 20 #define NF_BR_FORWARD 2 21 /* Packets coming from a local process. */ 22 #define NF_BR_LOCAL_OUT 3 23 /* Packets about to hit the wire. */ 24 #define NF_BR_POST_ROUTING 4 25 /* Not really a hook, but used for the ebtables broute table */ 26 #define NF_BR_BROUTING 5 27 #define NF_BR_NUMHOOKS 6 28 29 #ifdef __KERNEL__ 30 31 enum nf_br_hook_priorities { 32 NF_BR_PRI_FIRST = INT_MIN, 33 NF_BR_PRI_NAT_DST_BRIDGED = -300, 34 NF_BR_PRI_FILTER_BRIDGED = -200, 35 NF_BR_PRI_BRNF = 0, 36 NF_BR_PRI_NAT_DST_OTHER = 100, 37 NF_BR_PRI_FILTER_OTHER = 200, 38 NF_BR_PRI_NAT_SRC = 300, 39 NF_BR_PRI_LAST = INT_MAX, 40 }; 41 42 #ifdef CONFIG_BRIDGE_NETFILTER 43 44 #define BRNF_PKT_TYPE 0x01 45 #define BRNF_BRIDGED_DNAT 0x02 46 #define BRNF_DONT_TAKE_PARENT 0x04 47 #define BRNF_BRIDGED 0x08 48 #define BRNF_NF_BRIDGE_PREROUTING 0x10 49 50 51 /* Only used in br_forward.c */ 52 static inline 53 void nf_bridge_maybe_copy_header(struct sk_buff *skb) 54 { 55 if (skb->nf_bridge) { 56 if (skb->protocol == __constant_htons(ETH_P_8021Q)) { 57 memcpy(skb->data - 18, skb->nf_bridge->data, 18); 58 skb_push(skb, 4); 59 } else 60 memcpy(skb->data - 16, skb->nf_bridge->data, 16); 61 } 62 } 63 64 /* This is called by the IP fragmenting code and it ensures there is 65 * enough room for the encapsulating header (if there is one). */ 66 static inline 67 int nf_bridge_pad(struct sk_buff *skb) 68 { 69 if (skb->protocol == __constant_htons(ETH_P_IP)) 70 return 0; 71 if (skb->nf_bridge) { 72 if (skb->protocol == __constant_htons(ETH_P_8021Q)) 73 return 4; 74 } 75 return 0; 76 } 77 78 struct bridge_skb_cb { 79 union { 80 __u32 ipv4; 81 } daddr; 82 }; 83 #endif /* CONFIG_BRIDGE_NETFILTER */ 84 85 #endif /* __KERNEL__ */ 86 #endif 87