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
   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_PKT_TYPE                   0x01
  21 #define BRNF_BRIDGED_DNAT               0x02
  22 #define BRNF_BRIDGED                    0x04
  23 #define BRNF_NF_BRIDGE_PREROUTING       0x08
  24 #define BRNF_8021Q                      0x10
  25 #define BRNF_PPPoE                      0x20
  26
  27 static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
  28 {
  29         switch (skb->protocol) {
  30         case __cpu_to_be16(ETH_P_8021Q):
  31                 return VLAN_HLEN;
  32         case __cpu_to_be16(ETH_P_PPP_SES):
  33                 return PPPOE_SES_HLEN;
  34         default:
  35                 return 0;
  36         }
  37 }
  38
  39 static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
  40 {
  41         if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
  42                 return PPPOE_SES_HLEN;
  43         return 0;
  44 }
  45
  46 int br_handle_frame_finish(struct sk_buff *skb);
  47
  48 /* This is called by the IP fragmenting code and it ensures there is
  49  * enough room for the encapsulating header (if there is one). */
  50 static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
  51 {
  52         if (skb->nf_bridge)
  53                 return nf_bridge_encap_header_len(skb);
  54         return 0;
  55 }
  56
  57 struct bridge_skb_cb {
  58         union {
  59                 __be32 ipv4;
  60         } daddr;
  61 };
  62
  63 static inline void br_drop_fake_rtable(struct sk_buff *skb)
  64 {
  65         struct dst_entry *dst = skb_dst(skb);
  66
  67         if (dst && (dst->flags & DST_FAKE_RTABLE))
  68                 skb_dst_drop(skb);
  69 }
  70
  71 #else
  72 #define nf_bridge_pad(skb)                      (0)
  73 #define br_drop_fake_rtable(skb)                do { } while (0)
  74 #endif /* CONFIG_BRIDGE_NETFILTER */
  75
  76 #endif