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 70