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