| /* 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 |
| #if IS_ENABLED(CONFIG_NET_ACT_CT) |
| NF_CT_EXT_ACT_CT, |
| #endif |
| NF_CT_EXT_NUM, |
| }; |
| |
| /* Extensions: optional stuff which isn't permanently in struct. */ |
| struct nf_ct_ext { |
| u8 offset[NF_CT_EXT_NUM]; |
| u8 len; |
| unsigned int gen_id; |
| char data[] __aligned(8); |
| }; |
| |
| 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)); |
| } |
| |
| void *__nf_ct_ext_find(const struct nf_ct_ext *ext, u8 id); |
| |
| static inline void *nf_ct_ext_find(const struct nf_conn *ct, u8 id) |
| { |
| struct nf_ct_ext *ext = ct->ext; |
| |
| if (!ext || !__nf_ct_ext_exist(ext, id)) |
| return NULL; |
| |
| if (unlikely(ext->gen_id)) |
| return __nf_ct_ext_find(ext, id); |
| |
| return (void *)ct->ext + ct->ext->offset[id]; |
| } |
| |
| /* 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); |
| |
| /* ext genid. if ext->id != ext_genid, extensions cannot be used |
| * anymore unless conntrack has CONFIRMED bit set. |
| */ |
| extern atomic_t nf_conntrack_ext_genid; |
| void nf_ct_ext_bump_genid(void); |
| |
| #endif /* _NF_CONNTRACK_EXTEND_H */ |