| /* SPDX-License-Identifier: GPL-2.0 */ |
| #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 IS_ENABLED(CONFIG_NF_NAT) |
| NF_CT_EXT_NAT, |
| #endif |
| NF_CT_EXT_SEQADJ, |
| NF_CT_EXT_ACCT, |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| NF_CT_EXT_ECACHE, |
| #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 |
| #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY) |
| NF_CT_EXT_SYNPROXY, |
| #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_acct |
| #define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache |
| #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 |
| #define NF_CT_EXT_SYNPROXY_TYPE struct nf_conn_synproxy |
| |
| /* Extensions: optional stuff which isn't permanently in struct. */ |
| struct nf_ct_ext { |
| u8 offset[NF_CT_EXT_NUM]; |
| u8 len; |
| char data[]; |
| }; |
| |
| 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 */ |
| void nf_ct_ext_destroy(struct nf_conn *ct); |
| |
| /* Add this type, returns pointer to data or NULL. */ |
| void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp); |
| |
| struct nf_ct_ext_type { |
| /* Destroys relationships (can be NULL). */ |
| void (*destroy)(struct nf_conn *ct); |
| |
| enum nf_ct_ext_id id; |
| |
| /* Length and min alignment. */ |
| u8 len; |
| u8 align; |
| }; |
| |
| int nf_ct_extend_register(const struct nf_ct_ext_type *type); |
| void nf_ct_extend_unregister(const struct nf_ct_ext_type *type); |
| #endif /* _NF_CONNTRACK_EXTEND_H */ |