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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | #ifndef __LINUX_BRIDGE_NETFILTER_H #define __LINUX_BRIDGE_NETFILTER_H /* bridge-specific defines for netfilter. */ #include <linux/config.h> #include <linux/netfilter.h> #if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER) #include <asm/atomic.h> #include <linux/if_ether.h> #endif /* Bridge Hooks */ /* After promisc drops, checksum checks. */ #define NF_BR_PRE_ROUTING 0 /* If the packet is destined for this box. */ #define NF_BR_LOCAL_IN 1 /* If the packet is destined for another interface. */ #define NF_BR_FORWARD 2 /* Packets coming from a local process. */ #define NF_BR_LOCAL_OUT 3 /* Packets about to hit the wire. */ #define NF_BR_POST_ROUTING 4 /* Not really a hook, but used for the ebtables broute table */ #define NF_BR_BROUTING 5 #define NF_BR_NUMHOOKS 6 #ifdef __KERNEL__ 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_BRIDGE_NETFILTER #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 static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) { struct nf_bridge_info **nf_bridge = &(skb->nf_bridge); if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) { atomic_set(&(*nf_bridge)->use, 1); (*nf_bridge)->mask = 0; (*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL; #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) (*nf_bridge)->netoutdev = NULL; #endif } return *nf_bridge; } /* Only used in br_forward.c */ static inline void nf_bridge_maybe_copy_header(struct sk_buff *skb) { if (skb->nf_bridge) { if (skb->protocol == __constant_htons(ETH_P_8021Q)) { memcpy(skb->data - 18, skb->nf_bridge->data, 18); skb_push(skb, 4); } else memcpy(skb->data - 16, skb->nf_bridge->data, 16); } } static inline void nf_bridge_save_header(struct sk_buff *skb) { int header_size = 16; if (skb->protocol == __constant_htons(ETH_P_8021Q)) header_size = 18; memcpy(skb->nf_bridge->data, skb->data - header_size, header_size); } /* This is called by the IP fragmenting code and it ensures there is * enough room for the encapsulating header (if there is one). */ static inline int nf_bridge_pad(struct sk_buff *skb) { if (skb->protocol == __constant_htons(ETH_P_IP)) return 0; if (skb->nf_bridge) { if (skb->protocol == __constant_htons(ETH_P_8021Q)) return 4; } return 0; } struct bridge_skb_cb { union { __u32 ipv4; } daddr; }; #endif /* CONFIG_BRIDGE_NETFILTER */ #endif /* __KERNEL__ */ #endif |