netfilter_bridge.h
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上传日期:2009-04-28
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文件大小:3k
- #ifndef __LINUX_BRIDGE_NETFILTER_H
- #define __LINUX_BRIDGE_NETFILTER_H
- /* bridge-specific defines for netfilter.
- */
- #include <linux/config.h>
- #include <linux/netfilter.h>
- #if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER)
- #include <asm/atomic.h>
- #include <linux/if_ether.h>
- #endif
- /* 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_DONT_TAKE_PARENT 0x04
- #define BRNF_BRIDGED 0x08
- #define BRNF_NF_BRIDGE_PREROUTING 0x10
- static inline
- struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
- {
- struct nf_bridge_info **nf_bridge = &(skb->nf_bridge);
- if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) {
- atomic_set(&(*nf_bridge)->use, 1);
- (*nf_bridge)->mask = 0;
- (*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
- #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
- (*nf_bridge)->netoutdev = NULL;
- #endif
- }
- return *nf_bridge;
- }
- /* Only used in br_forward.c */
- static inline
- void nf_bridge_maybe_copy_header(struct sk_buff *skb)
- {
- if (skb->nf_bridge) {
- if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
- memcpy(skb->data - 18, skb->nf_bridge->data, 18);
- skb_push(skb, 4);
- } else
- memcpy(skb->data - 16, skb->nf_bridge->data, 16);
- }
- }
- static inline
- void nf_bridge_save_header(struct sk_buff *skb)
- {
- int header_size = 16;
- if (skb->protocol == __constant_htons(ETH_P_8021Q))
- header_size = 18;
- memcpy(skb->nf_bridge->data, skb->data - header_size, header_size);
- }
- /* 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
- int nf_bridge_pad(struct sk_buff *skb)
- {
- if (skb->protocol == __constant_htons(ETH_P_IP))
- return 0;
- if (skb->nf_bridge) {
- if (skb->protocol == __constant_htons(ETH_P_8021Q))
- return 4;
- }
- return 0;
- }
- struct bridge_skb_cb {
- union {
- __u32 ipv4;
- } daddr;
- };
- #endif /* CONFIG_BRIDGE_NETFILTER */
- #endif /* __KERNEL__ */
- #endif