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 #ifdef 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 /* Only used in br_forward.c */ 28 extern int nf_bridge_copy_header(struct sk_buff *skb); 29 static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb) 30 { 31 if (skb->nf_bridge && 32 skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT)) 33 return nf_bridge_copy_header(skb); 34 return 0; 35 } 36 37 static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb) 38 { 39 switch (skb->protocol) { 40 case __cpu_to_be16(ETH_P_8021Q): 41 return VLAN_HLEN; 42 case __cpu_to_be16(ETH_P_PPP_SES): 43 return PPPOE_SES_HLEN; 44 default: 45 return 0; 46 } 47 } 48 49 static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb) 50 { 51 if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE)) 52 return PPPOE_SES_HLEN; 53 return 0; 54 } 55 56 extern int br_handle_frame_finish(struct sk_buff *skb); 57 /* Only used in br_device.c */ 58 static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) 59 { 60 struct nf_bridge_info *nf_bridge = skb->nf_bridge; 61 62 skb_pull(skb, ETH_HLEN); 63 nf_bridge->mask ^= BRNF_BRIDGED_DNAT; 64 skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), 65 skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); 66 skb->dev = nf_bridge->physindev; 67 return br_handle_frame_finish(skb); 68 } 69 70 /* This is called by the IP fragmenting code and it ensures there is 71 * enough room for the encapsulating header (if there is one). */ 72 static inline unsigned int nf_bridge_pad(const struct sk_buff *skb) 73 { 74 if (skb->nf_bridge) 75 return nf_bridge_encap_header_len(skb); 76 return 0; 77 } 78 79 struct bridge_skb_cb { 80 union { 81 __be32 ipv4; 82 } daddr; 83 }; 84 85 static inline void br_drop_fake_rtable(struct sk_buff *skb) 86 { 87 struct dst_entry *dst = skb_dst(skb); 88 89 if (dst && (dst->flags & DST_FAKE_RTABLE)) 90 skb_dst_drop(skb); 91 } 92 93 #else 94 #define nf_bridge_maybe_copy_header(skb) (0) 95 #define nf_bridge_pad(skb) (0) 96 #define br_drop_fake_rtable(skb) do { } while (0) 97 #endif /* CONFIG_BRIDGE_NETFILTER */ 98 99 #endif 100