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Normally, each connection needs a unique identity. Conntrack zones allow to specify a numerical zone using the CT target, connections in different zones can use the same identity. Example: iptables -t raw -A PREROUTING -i veth0 -j CT --zone 1 iptables -t raw -A OUTPUT -o veth1 -j CT --zone 1 Signed-off-by: Patrick McHardy <kaber@trash.net>
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
#ifndef _NF_CONNTRACK_EXTEND_H
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#define _NF_CONNTRACK_EXTEND_H
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#include <net/netfilter/nf_conntrack.h>
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enum nf_ct_ext_id {
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NF_CT_EXT_HELPER,
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NF_CT_EXT_NAT,
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NF_CT_EXT_ACCT,
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NF_CT_EXT_ECACHE,
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NF_CT_EXT_ZONE,
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NF_CT_EXT_NUM,
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};
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#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
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#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
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#define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter
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#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
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#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone
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/* Extensions: optional stuff which isn't permanently in struct. */
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struct nf_ct_ext {
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struct rcu_head rcu;
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u8 offset[NF_CT_EXT_NUM];
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u8 len;
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char data[0];
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};
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static inline int nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
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{
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return (ct->ext && ct->ext->offset[id]);
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}
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static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id)
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{
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if (!nf_ct_ext_exist(ct, id))
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return NULL;
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return (void *)ct->ext + ct->ext->offset[id];
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}
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#define nf_ct_ext_find(ext, id) \
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((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
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/* Destroy all relationships */
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extern void __nf_ct_ext_destroy(struct nf_conn *ct);
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static inline void nf_ct_ext_destroy(struct nf_conn *ct)
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{
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if (ct->ext)
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__nf_ct_ext_destroy(ct);
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}
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/* Free operation. If you want to free a object referred from private area,
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* please implement __nf_ct_ext_free() and call it.
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*/
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static inline void nf_ct_ext_free(struct nf_conn *ct)
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{
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if (ct->ext)
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kfree(ct->ext);
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}
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/* Add this type, returns pointer to data or NULL. */
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void *
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__nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
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#define nf_ct_ext_add(ct, id, gfp) \
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((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp)))
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#define NF_CT_EXT_F_PREALLOC 0x0001
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struct nf_ct_ext_type {
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/* Destroys relationships (can be NULL). */
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void (*destroy)(struct nf_conn *ct);
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/* Called when realloacted (can be NULL).
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Contents has already been moved. */
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void (*move)(void *new, void *old);
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enum nf_ct_ext_id id;
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unsigned int flags;
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/* Length and min alignment. */
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u8 len;
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u8 align;
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/* initial size of nf_ct_ext. */
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u8 alloc_size;
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};
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int nf_ct_extend_register(struct nf_ct_ext_type *type);
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void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
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#endif /* _NF_CONNTRACK_EXTEND_H */
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