| #ifndef _NF_CONNTRACK_EXTEND_H |
| #define _NF_CONNTRACK_EXTEND_H |
| |
| #include <linux/slab.h> |
| |
| #include <net/netfilter/nf_conntrack.h> |
| |
| enum nf_ct_ext_id { |
| NF_CT_EXT_HELPER, |
| #if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE) |
| NF_CT_EXT_NAT, |
| NF_CT_EXT_SEQADJ, |
| #endif |
| NF_CT_EXT_ACCT, |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| NF_CT_EXT_ECACHE, |
| #endif |
| #ifdef CONFIG_NF_CONNTRACK_ZONES |
| NF_CT_EXT_ZONE, |
| #endif |
| #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP |
| NF_CT_EXT_TSTAMP, |
| #endif |
| #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
| NF_CT_EXT_TIMEOUT, |
| #endif |
| #ifdef CONFIG_NF_CONNTRACK_LABELS |
| NF_CT_EXT_LABELS, |
| #endif |
| NF_CT_EXT_NUM, |
| }; |
| |
| #define NF_CT_EXT_HELPER_TYPE struct nf_conn_help |
| #define NF_CT_EXT_NAT_TYPE struct nf_conn_nat |
| #define NF_CT_EXT_SEQADJ_TYPE struct nf_conn_seqadj |
| #define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter |
| #define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache |
| #define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone |
| #define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp |
| #define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout |
| #define NF_CT_EXT_LABELS_TYPE struct nf_conn_labels |
| |
| /* Extensions: optional stuff which isn't permanently in struct. */ |
| struct nf_ct_ext { |
| struct rcu_head rcu; |
| u8 offset[NF_CT_EXT_NUM]; |
| u8 len; |
| char data[0]; |
| }; |
| |
| static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id) |
| { |
| return !!ext->offset[id]; |
| } |
| |
| static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id) |
| { |
| return (ct->ext && __nf_ct_ext_exist(ct->ext, 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_length(struct nf_conn *ct, enum nf_ct_ext_id id, |
| size_t var_alloc_len, gfp_t gfp); |
| |
| #define nf_ct_ext_add(ct, id, gfp) \ |
| ((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), 0, (gfp))) |
| #define nf_ct_ext_add_length(ct, id, len, gfp) \ |
| ((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), (len), (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)(void *new, 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 */ |