kernel/include/linux/netfilter_bridge.h

   1 #ifndef __LINUX_BRIDGE_NETFILTER_H
   2 #define __LINUX_BRIDGE_NETFILTER_H
   3
   4 #include <uapi/linux/netfilter_bridge.h>
   5 #include <linux/skbuff.h>
   6
   7 enum nf_br_hook_priorities {
   8         NF_BR_PRI_FIRST = INT_MIN,
   9         NF_BR_PRI_NAT_DST_BRIDGED = -300,
  10         NF_BR_PRI_FILTER_BRIDGED = -200,
  11         NF_BR_PRI_BRNF = 0,
  12         NF_BR_PRI_NAT_DST_OTHER = 100,
  13         NF_BR_PRI_FILTER_OTHER = 200,
  14         NF_BR_PRI_NAT_SRC = 300,
  15         NF_BR_PRI_LAST = INT_MAX,
  16 };
  17
  18 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
  19
  20 #define BRNF_BRIDGED_DNAT               0x02
  21 #define BRNF_NF_BRIDGE_PREROUTING       0x08
  22
  23 static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
  24 {
  25         if (skb->nf_bridge->orig_proto == BRNF_PROTO_PPPOE)
  26                 return PPPOE_SES_HLEN;
  27         return 0;
  28 }
  29
  30 int br_handle_frame_finish(struct sock *sk, struct sk_buff *skb);
  31
  32 static inline void br_drop_fake_rtable(struct sk_buff *skb)
  33 {
  34         struct dst_entry *dst = skb_dst(skb);
  35
  36         if (dst && (dst->flags & DST_FAKE_RTABLE))
  37                 skb_dst_drop(skb);
  38 }
  39
  40 static inline int nf_bridge_get_physinif(const struct sk_buff *skb)
  41 {
  42         struct nf_bridge_info *nf_bridge;
  43
  44         if (skb->nf_bridge == NULL)
  45                 return 0;
  46
  47         nf_bridge = skb->nf_bridge;
  48         return nf_bridge->physindev ? nf_bridge->physindev->ifindex : 0;
  49 }
  50
  51 static inline int nf_bridge_get_physoutif(const struct sk_buff *skb)
  52 {
  53         struct nf_bridge_info *nf_bridge;
  54
  55         if (skb->nf_bridge == NULL)
  56                 return 0;
  57
  58         nf_bridge = skb->nf_bridge;
  59         return nf_bridge->physoutdev ? nf_bridge->physoutdev->ifindex : 0;
  60 }
  61
  62 static inline struct net_device *
  63 nf_bridge_get_physindev(const struct sk_buff *skb)
  64 {
  65         return skb->nf_bridge ? skb->nf_bridge->physindev : NULL;
  66 }
  67
  68 static inline struct net_device *
  69 nf_bridge_get_physoutdev(const struct sk_buff *skb)
  70 {
  71         return skb->nf_bridge ? skb->nf_bridge->physoutdev : NULL;
  72 }
  73 #else
  74 #define br_drop_fake_rtable(skb)                do { } while (0)
  75 #endif /* CONFIG_BRIDGE_NETFILTER */
  76
  77 #endif