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 /* Extensions: optional stuff which isn't permanently in struct. */ 38 struct nf_ct_ext { 39 u8 offset[NF_CT_EXT_NUM]; 40 u8 len; 41 unsigned int gen_id; 42 char data[] __aligned(8); 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 void *__nf_ct_ext_find(const struct nf_ct_ext *ext, u8 id); 56 57 static inline void *nf_ct_ext_find(const struct nf_conn *ct, u8 id) 58 { 59 struct nf_ct_ext *ext = ct->ext; 60 61 if (!ext || !__nf_ct_ext_exist(ext, id)) 62 return NULL; 63 64 if (unlikely(ext->gen_id)) 65 return __nf_ct_ext_find(ext, id); 66 67 return (void *)ct->ext + ct->ext->offset[id]; 68 } 69 70 /* Add this type, returns pointer to data or NULL. */ 71 void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp); 72 73 /* ext genid. if ext->id != ext_genid, extensions cannot be used 74 * anymore unless conntrack has CONFIRMED bit set. 75 */ 76 extern atomic_t nf_conntrack_ext_genid; 77 void nf_ct_ext_bump_genid(void); 78 79 #endif /* _NF_CONNTRACK_EXTEND_H */ 80