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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 #include <linux/if_pppox.h>
  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 extern int nf_bridge_copy_header(struct sk_buff *skb);
  51 static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
  52 {
  53         if (skb->nf_bridge)
  54                 return nf_bridge_copy_header(skb);
  55         return 0;
  56 }
  57
  58 static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
  59 {
  60         switch (skb->protocol) {
  61         case __constant_htons(ETH_P_8021Q):
  62                 return VLAN_HLEN;
  63         case __constant_htons(ETH_P_PPP_SES):
  64                 return PPPOE_SES_HLEN;
  65         default:
  66                 return 0;
  67         }
  68 }
  69
  70 /* This is called by the IP fragmenting code and it ensures there is
  71  * enough room for the encapsulating header (if there is one). */
  72 static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
  73 {
  74         if (skb->nf_bridge)
  75                 return nf_bridge_encap_header_len(skb);
  76         return 0;
  77 }
  78
  79 struct bridge_skb_cb {
  80         union {
  81                 __be32 ipv4;
  82         } daddr;
  83 };
  84
  85 #else
  86 #define nf_bridge_maybe_copy_header(skb)        (0)
  87 #define nf_bridge_pad(skb)                      (0)
  88 #endif /* CONFIG_BRIDGE_NETFILTER */
  89
  90 #endif /* __KERNEL__ */
  91 #endif