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