diff options
Diffstat (limited to 'include')
-rw-r--r-- | include/net/netfilter/nf_conntrack.h | 3 | ||||
-rw-r--r-- | include/net/netfilter/nf_conntrack_extend.h | 80 |
2 files changed, 83 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h index 12a0e793cc0..c31382d3ef1 100644 --- a/include/net/netfilter/nf_conntrack.h +++ b/include/net/netfilter/nf_conntrack.h @@ -131,6 +131,9 @@ struct nf_conn /* Storage reserved for other modules: */ union nf_conntrack_proto proto; + /* Extensions */ + struct nf_ct_ext *ext; + /* features dynamically at the end: helper, nat (both optional) */ char data[0]; }; diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h new file mode 100644 index 00000000000..8a988d13646 --- /dev/null +++ b/include/net/netfilter/nf_conntrack_extend.h @@ -0,0 +1,80 @@ +#ifndef _NF_CONNTRACK_EXTEND_H +#define _NF_CONNTRACK_EXTEND_H + +#include <net/netfilter/nf_conntrack.h> + +enum nf_ct_ext_id +{ + NF_CT_EXT_NUM, +}; + +/* Extensions: optional stuff which isn't permanently in struct. */ +struct nf_ct_ext { + u8 offset[NF_CT_EXT_NUM]; + u8 len; + u8 real_len; + char data[0]; +}; + +static inline int nf_ct_ext_exist(const struct nf_conn *ct, u8 id) +{ + return (ct->ext && ct->ext->offset[id]); +} + +static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id) +{ + if (!nf_ct_ext_exist(ct, id)) + return NULL; + + return (void *)ct->ext + ct->ext->offset[id]; +} +#define nf_ct_ext_find(ext, id) \ + ((id##_TYPE *)__nf_ct_ext_find((ext), (id))) + +/* Destroy all relationships */ +extern void __nf_ct_ext_destroy(struct nf_conn *ct); +static inline void nf_ct_ext_destroy(struct nf_conn *ct) +{ + if (ct->ext) + __nf_ct_ext_destroy(ct); +} + +/* Free operation. If you want to free a object referred from private area, + * please implement __nf_ct_ext_free() and call it. + */ +static inline void nf_ct_ext_free(struct nf_conn *ct) +{ + if (ct->ext) + kfree(ct->ext); +} + +/* Add this type, returns pointer to data or NULL. */ +void * +__nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp); +#define nf_ct_ext_add(ct, id, gfp) \ + ((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp))) + +#define NF_CT_EXT_F_PREALLOC 0x0001 + +struct nf_ct_ext_type +{ + /* Destroys relationships (can be NULL). */ + void (*destroy)(struct nf_conn *ct); + /* Called when realloacted (can be NULL). + Contents has already been moved. */ + void (*move)(struct nf_conn *ct, void *old); + + enum nf_ct_ext_id id; + + unsigned int flags; + + /* Length and min alignment. */ + u8 len; + u8 align; + /* initial size of nf_ct_ext. */ + u8 alloc_size; +}; + +int nf_ct_extend_register(struct nf_ct_ext_type *type); +void nf_ct_extend_unregister(struct nf_ct_ext_type *type); +#endif /* _NF_CONNTRACK_EXTEND_H */ |