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/config.h>
   8 #include <linux/netfilter.h>
   9 #if defined(__KERNEL__) && defined(CONFIG_NETFILTER)
  10 #include <asm/atomic.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 #define BRNF_PKT_TYPE                   0x01
  31 #define BRNF_BRIDGED_DNAT               0x02
  32 #define BRNF_DONT_TAKE_PARENT           0x04
  33 #define BRNF_BRIDGED                    0x08
  34
  35 enum nf_br_hook_priorities {
  36         NF_BR_PRI_FIRST = INT_MIN,
  37         NF_BR_PRI_NAT_DST_BRIDGED = -300,
  38         NF_BR_PRI_FILTER_BRIDGED = -200,
  39         NF_BR_PRI_BRNF = 0,
  40         NF_BR_PRI_NAT_DST_OTHER = 100,
  41         NF_BR_PRI_FILTER_OTHER = 200,
  42         NF_BR_PRI_NAT_SRC = 300,
  43         NF_BR_PRI_LAST = INT_MAX,
  44 };
  45
  46 #ifdef CONFIG_NETFILTER
  47 static inline
  48 struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
  49 {
  50         struct nf_bridge_info **nf_bridge = &(skb->nf_bridge);
  51
  52         if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) {
  53                 atomic_set(&(*nf_bridge)->use, 1);
  54                 (*nf_bridge)->mask = 0;
  55                 (*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
  56         }
  57
  58         return *nf_bridge;
  59 }
  60
  61 struct bridge_skb_cb {
  62         union {
  63                 __u32 ipv4;
  64         } daddr;
  65 };
  66 #endif /* CONFIG_NETFILTER */
  67
  68 #endif /* __KERNEL__ */
  69 #endif