1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _NF_CONNTRACK_EXTEND_H 3 #define _NF_CONNTRACK_EXTEND_H 4 5 #include <linux/slab.h> 6 7 #include <net/netfilter/nf_conntrack.h> 8 9 enum nf_ct_ext_id { 10 NF_CT_EXT_HELPER, 11 #if IS_ENABLED(CONFIG_NF_NAT) 12 NF_CT_EXT_NAT, 13 #endif 14 NF_CT_EXT_SEQADJ, 15 NF_CT_EXT_ACCT, 16 #ifdef CONFIG_NF_CONNTRACK_EVENTS 17 NF_CT_EXT_ECACHE, 18 #endif 19 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP 20 NF_CT_EXT_TSTAMP, 21 #endif 22 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 23 NF_CT_EXT_TIMEOUT, 24 #endif 25 #ifdef CONFIG_NF_CONNTRACK_LABELS 26 NF_CT_EXT_LABELS, 27 #endif 28 #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY) 29 NF_CT_EXT_SYNPROXY, 30 #endif 31 #if IS_ENABLED(CONFIG_NET_ACT_CT) 32 NF_CT_EXT_ACT_CT, 33 #endif 34 NF_CT_EXT_NUM, 35 }; 36 37 #define NF_CT_EXT_HELPER_TYPE struct nf_conn_help 38 #define NF_CT_EXT_NAT_TYPE struct nf_conn_nat 39 #define NF_CT_EXT_SEQADJ_TYPE struct nf_conn_seqadj 40 #define NF_CT_EXT_ACCT_TYPE struct nf_conn_acct 41 #define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache 42 #define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp 43 #define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout 44 #define NF_CT_EXT_LABELS_TYPE struct nf_conn_labels 45 #define NF_CT_EXT_SYNPROXY_TYPE struct nf_conn_synproxy 46 #define NF_CT_EXT_ACT_CT_TYPE struct nf_conn_act_ct_ext 47 48 /* Extensions: optional stuff which isn't permanently in struct. */ 49 struct nf_ct_ext { 50 u8 offset[NF_CT_EXT_NUM]; 51 u8 len; 52 char data[]; 53 }; 54 55 static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id) 56 { 57 return !!ext->offset[id]; 58 } 59 60 static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id) 61 { 62 return (ct->ext && __nf_ct_ext_exist(ct->ext, id)); 63 } 64 65 static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id) 66 { 67 if (!nf_ct_ext_exist(ct, id)) 68 return NULL; 69 70 return (void *)ct->ext + ct->ext->offset[id]; 71 } 72 #define nf_ct_ext_find(ext, id) \ 73 ((id##_TYPE *)__nf_ct_ext_find((ext), (id))) 74 75 /* Destroy all relationships */ 76 void nf_ct_ext_destroy(struct nf_conn *ct); 77 78 /* Add this type, returns pointer to data or NULL. */ 79 void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp); 80 81 struct nf_ct_ext_type { 82 /* Destroys relationships (can be NULL). */ 83 void (*destroy)(struct nf_conn *ct); 84 85 enum nf_ct_ext_id id; 86 87 /* Length and min alignment. */ 88 u8 len; 89 u8 align; 90 }; 91 92 int nf_ct_extend_register(const struct nf_ct_ext_type *type); 93 void nf_ct_extend_unregister(const struct nf_ct_ext_type *type); 94 #endif /* _NF_CONNTRACK_EXTEND_H */ 95