1#ifndef _NF_CONNTRACK_EXTEND_H 2#define _NF_CONNTRACK_EXTEND_H 3 4#include <linux/slab.h> 5 6#include <net/netfilter/nf_conntrack.h> 7 8enum nf_ct_ext_id { 9 NF_CT_EXT_HELPER, 10 NF_CT_EXT_NAT, 11 NF_CT_EXT_ACCT, 12 NF_CT_EXT_ECACHE, 13 NF_CT_EXT_ZONE, 14 NF_CT_EXT_NUM, 15}; 16 17#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help 18#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat 19#define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter 20#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache 21#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone 22 23/* Extensions: optional stuff which isn't permanently in struct. */ 24struct nf_ct_ext { 25 struct rcu_head rcu; 26 u8 offset[NF_CT_EXT_NUM]; 27 u8 len; 28 char data[0]; 29}; 30 31static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id) 32{ 33 return !!ext->offset[id]; 34} 35 36static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id) 37{ 38 return (ct->ext && __nf_ct_ext_exist(ct->ext, id)); 39} 40 41static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id) 42{ 43 if (!nf_ct_ext_exist(ct, id)) 44 return NULL; 45 46 return (void *)ct->ext + ct->ext->offset[id]; 47} 48#define nf_ct_ext_find(ext, id) \ 49 ((id##_TYPE *)__nf_ct_ext_find((ext), (id))) 50 51/* Destroy all relationships */ 52extern void __nf_ct_ext_destroy(struct nf_conn *ct); 53static inline void nf_ct_ext_destroy(struct nf_conn *ct) 54{ 55 if (ct->ext) 56 __nf_ct_ext_destroy(ct); 57} 58 59/* Free operation. If you want to free a object referred from private area, 60 * please implement __nf_ct_ext_free() and call it. 61 */ 62static inline void nf_ct_ext_free(struct nf_conn *ct) 63{ 64 if (ct->ext) 65 kfree(ct->ext); 66} 67 68/* Add this type, returns pointer to data or NULL. */ 69void * 70__nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp); 71#define nf_ct_ext_add(ct, id, gfp) \ 72 ((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp))) 73 74#define NF_CT_EXT_F_PREALLOC 0x0001 75 76struct nf_ct_ext_type { 77 /* Destroys relationships (can be NULL). */ 78 void (*destroy)(struct nf_conn *ct); 79 /* Called when realloacted (can be NULL). 80 Contents has already been moved. */ 81 void (*move)(void *new, void *old); 82 83 enum nf_ct_ext_id id; 84 85 unsigned int flags; 86 87 /* Length and min alignment. */ 88 u8 len; 89 u8 align; 90 /* initial size of nf_ct_ext. */ 91 u8 alloc_size; 92}; 93 94int nf_ct_extend_register(struct nf_ct_ext_type *type); 95void nf_ct_extend_unregister(struct nf_ct_ext_type *type); 96#endif /* _NF_CONNTRACK_EXTEND_H */ 97