| #ifndef __LINUX_BRIDGE_NETFILTER_H |
| #define __LINUX_BRIDGE_NETFILTER_H |
| |
| /* bridge-specific defines for netfilter. |
| */ |
| |
| #include <linux/netfilter.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_vlan.h> |
| #include <linux/if_pppox.h> |
| |
| /* Bridge Hooks */ |
| /* After promisc drops, checksum checks. */ |
| #define NF_BR_PRE_ROUTING 0 |
| /* If the packet is destined for this box. */ |
| #define NF_BR_LOCAL_IN 1 |
| /* If the packet is destined for another interface. */ |
| #define NF_BR_FORWARD 2 |
| /* Packets coming from a local process. */ |
| #define NF_BR_LOCAL_OUT 3 |
| /* Packets about to hit the wire. */ |
| #define NF_BR_POST_ROUTING 4 |
| /* Not really a hook, but used for the ebtables broute table */ |
| #define NF_BR_BROUTING 5 |
| #define NF_BR_NUMHOOKS 6 |
| |
| #ifdef __KERNEL__ |
| |
| enum nf_br_hook_priorities { |
| NF_BR_PRI_FIRST = INT_MIN, |
| NF_BR_PRI_NAT_DST_BRIDGED = -300, |
| NF_BR_PRI_FILTER_BRIDGED = -200, |
| NF_BR_PRI_BRNF = 0, |
| NF_BR_PRI_NAT_DST_OTHER = 100, |
| NF_BR_PRI_FILTER_OTHER = 200, |
| NF_BR_PRI_NAT_SRC = 300, |
| NF_BR_PRI_LAST = INT_MAX, |
| }; |
| |
| #ifdef CONFIG_BRIDGE_NETFILTER |
| |
| #define BRNF_PKT_TYPE 0x01 |
| #define BRNF_BRIDGED_DNAT 0x02 |
| #define BRNF_BRIDGED 0x04 |
| #define BRNF_NF_BRIDGE_PREROUTING 0x08 |
| #define BRNF_8021Q 0x10 |
| #define BRNF_PPPoE 0x20 |
| |
| /* Only used in br_forward.c */ |
| extern int nf_bridge_copy_header(struct sk_buff *skb); |
| static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb) |
| { |
| if (skb->nf_bridge && |
| skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT)) |
| return nf_bridge_copy_header(skb); |
| return 0; |
| } |
| |
| static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb) |
| { |
| switch (skb->protocol) { |
| case __cpu_to_be16(ETH_P_8021Q): |
| return VLAN_HLEN; |
| case __cpu_to_be16(ETH_P_PPP_SES): |
| return PPPOE_SES_HLEN; |
| default: |
| return 0; |
| } |
| } |
| |
| static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb) |
| { |
| if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE)) |
| return PPPOE_SES_HLEN; |
| return 0; |
| } |
| |
| extern int br_handle_frame_finish(struct sk_buff *skb); |
| /* Only used in br_device.c */ |
| static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) |
| { |
| struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| |
| skb_pull(skb, ETH_HLEN); |
| nf_bridge->mask ^= BRNF_BRIDGED_DNAT; |
| skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), |
| skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); |
| skb->dev = nf_bridge->physindev; |
| return br_handle_frame_finish(skb); |
| } |
| |
| /* This is called by the IP fragmenting code and it ensures there is |
| * enough room for the encapsulating header (if there is one). */ |
| static inline unsigned int nf_bridge_pad(const struct sk_buff *skb) |
| { |
| if (skb->nf_bridge) |
| return nf_bridge_encap_header_len(skb); |
| return 0; |
| } |
| |
| struct bridge_skb_cb { |
| union { |
| __be32 ipv4; |
| } daddr; |
| }; |
| |
| #else |
| #define nf_bridge_maybe_copy_header(skb) (0) |
| #define nf_bridge_pad(skb) (0) |
| #endif /* CONFIG_BRIDGE_NETFILTER */ |
| |
| #endif /* __KERNEL__ */ |
| #endif |