include/linux/netfilter_bridge.h

   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