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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/netfilter_bridge.h | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/linux/netfilter_bridge.h')
-rw-r--r-- | include/linux/netfilter_bridge.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h new file mode 100644 index 000000000000..de4d397865ce --- /dev/null +++ b/include/linux/netfilter_bridge.h @@ -0,0 +1,113 @@ +#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 |