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 8 enum nf_ct_ext_id { 9 NF_CT_EXT_HELPER, 10 #if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE) 11 NF_CT_EXT_NAT, 12 #endif 13 NF_CT_EXT_ACCT, 14 #ifdef CONFIG_NF_CONNTRACK_EVENTS 15 NF_CT_EXT_ECACHE, 16 #endif 17 #ifdef CONFIG_NF_CONNTRACK_ZONES 18 NF_CT_EXT_ZONE, 19 #endif 20 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP 21 NF_CT_EXT_TSTAMP, 22 #endif 23 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 24 NF_CT_EXT_TIMEOUT, 25 #endif 26 NF_CT_EXT_NUM, 27 }; 28 29 #define NF_CT_EXT_HELPER_TYPE struct nf_conn_help 30 #define NF_CT_EXT_NAT_TYPE struct nf_conn_nat 31 #define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter 32 #define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache 33 #define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone 34 #define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp 35 #define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout 36 37 /* Extensions: optional stuff which isn't permanently in struct. */ 38 struct nf_ct_ext { 39 struct rcu_head rcu; 40 u8 offset[NF_CT_EXT_NUM]; 41 u8 len; 42 char data[0]; 43 }; 44 45 static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id) 46 { 47 return !!ext->offset[id]; 48 } 49 50 static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id) 51 { 52 return (ct->ext && __nf_ct_ext_exist(ct->ext, id)); 53 } 54 55 static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id) 56 { 57 if (!nf_ct_ext_exist(ct, id)) 58 return NULL; 59 60 return (void *)ct->ext + ct->ext->offset[id]; 61 } 62 #define nf_ct_ext_find(ext, id) \ 63 ((id##_TYPE *)__nf_ct_ext_find((ext), (id))) 64 65 /* Destroy all relationships */ 66 extern void __nf_ct_ext_destroy(struct nf_conn *ct); 67 static inline void nf_ct_ext_destroy(struct nf_conn *ct) 68 { 69 if (ct->ext) 70 __nf_ct_ext_destroy(ct); 71 } 72 73 /* Free operation. If you want to free a object referred from private area, 74 * please implement __nf_ct_ext_free() and call it. 75 */ 76 static inline void nf_ct_ext_free(struct nf_conn *ct) 77 { 78 if (ct->ext) 79 kfree(ct->ext); 80 } 81 82 /* Add this type, returns pointer to data or NULL. */ 83 void * 84 __nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp); 85 #define nf_ct_ext_add(ct, id, gfp) \ 86 ((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp))) 87 88 #define NF_CT_EXT_F_PREALLOC 0x0001 89 90 struct nf_ct_ext_type { 91 /* Destroys relationships (can be NULL). */ 92 void (*destroy)(struct nf_conn *ct); 93 /* Called when realloacted (can be NULL). 94 Contents has already been moved. */ 95 void (*move)(void *new, void *old); 96 97 enum nf_ct_ext_id id; 98 99 unsigned int flags; 100 101 /* Length and min alignment. */ 102 u8 len; 103 u8 align; 104 /* initial size of nf_ct_ext. */ 105 u8 alloc_size; 106 }; 107 108 int nf_ct_extend_register(struct nf_ct_ext_type *type); 109 void nf_ct_extend_unregister(struct nf_ct_ext_type *type); 110 #endif /* _NF_CONNTRACK_EXTEND_H */ 111