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