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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _TCP_AO_H
#define _TCP_AO_H
#define TCP_AO_KEY_ALIGN 1
#define __tcp_ao_key_align __aligned(TCP_AO_KEY_ALIGN)
union tcp_ao_addr {
struct in_addr a4;
#if IS_ENABLED(CONFIG_IPV6)
struct in6_addr a6;
#endif
};
struct tcp_ao_hdr {
u8 kind;
u8 length;
u8 keyid;
u8 rnext_keyid;
};
struct tcp_ao_key {
struct hlist_node node;
union tcp_ao_addr addr;
u8 key[TCP_AO_MAXKEYLEN] __tcp_ao_key_align;
unsigned int tcp_sigpool_id;
unsigned int digest_size;
u8 prefixlen;
u8 family;
u8 keylen;
u8 keyflags;
u8 sndid;
u8 rcvid;
u8 maclen;
struct rcu_head rcu;
u8 traffic_keys[];
};
static inline u8 *rcv_other_key(struct tcp_ao_key *key)
{
return key->traffic_keys;
}
static inline u8 *snd_other_key(struct tcp_ao_key *key)
{
return key->traffic_keys + key->digest_size;
}
static inline int tcp_ao_maclen(const struct tcp_ao_key *key)
{
return key->maclen;
}
static inline int tcp_ao_len(const struct tcp_ao_key *key)
{
return tcp_ao_maclen(key) + sizeof(struct tcp_ao_hdr);
}
static inline unsigned int tcp_ao_digest_size(struct tcp_ao_key *key)
{
return key->digest_size;
}
static inline int tcp_ao_sizeof_key(const struct tcp_ao_key *key)
{
return sizeof(struct tcp_ao_key) + (key->digest_size << 1);
}
struct tcp_ao_info {
/* List of tcp_ao_key's */
struct hlist_head head;
/* current_key and rnext_key aren't maintained on listen sockets.
* Their purpose is to cache keys on established connections,
* saving needless lookups. Never dereference any of them from
* listen sockets.
* ::current_key may change in RX to the key that was requested by
* the peer, please use READ_ONCE()/WRITE_ONCE() in order to avoid
* load/store tearing.
* Do the same for ::rnext_key, if you don't hold socket lock
* (it's changed only by userspace request in setsockopt()).
*/
struct tcp_ao_key *current_key;
struct tcp_ao_key *rnext_key;
u32 ao_required :1,
__unused :31;
__be32 lisn;
__be32 risn;
refcount_t refcnt; /* Protects twsk destruction */
struct rcu_head rcu;
};
#ifdef CONFIG_TCP_AO
/* TCP-AO structures and functions */
struct tcp4_ao_context {
__be32 saddr;
__be32 daddr;
__be16 sport;
__be16 dport;
__be32 sisn;
__be32 disn;
};
struct tcp6_ao_context {
struct in6_addr saddr;
struct in6_addr daddr;
__be16 sport;
__be16 dport;
__be32 sisn;
__be32 disn;
};
struct tcp_sigpool;
int tcp_ao_transmit_skb(struct sock *sk, struct sk_buff *skb,
struct tcp_ao_key *key, struct tcphdr *th,
__u8 *hash_location);
int tcp_ao_hash_skb(unsigned short int family,
char *ao_hash, struct tcp_ao_key *key,
const struct sock *sk, const struct sk_buff *skb,
const u8 *tkey, int hash_offset, u32 sne);
int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family,
sockptr_t optval, int optlen);
struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao,
int sndid, int rcvid);
int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
unsigned int len, struct tcp_sigpool *hp);
void tcp_ao_destroy_sock(struct sock *sk, bool twsk);
void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp);
struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
const union tcp_ao_addr *addr,
int family, int sndid, int rcvid);
int tcp_ao_hash_hdr(unsigned short family, char *ao_hash,
struct tcp_ao_key *key, const u8 *tkey,
const union tcp_ao_addr *daddr,
const union tcp_ao_addr *saddr,
const struct tcphdr *th, u32 sne);
int tcp_ao_prepare_reset(const struct sock *sk, struct sk_buff *skb,
const struct tcp_ao_hdr *aoh, int l3index,
struct tcp_ao_key **key, char **traffic_key,
bool *allocated_traffic_key, u8 *keyid, u32 *sne);
/* ipv4 specific functions */
int tcp_v4_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen);
struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
int sndid, int rcvid);
int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
const struct sock *sk,
__be32 sisn, __be32 disn, bool send);
int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key,
const struct sock *sk, const struct sk_buff *skb,
const u8 *tkey, int hash_offset, u32 sne);
/* ipv6 specific functions */
int tcp_v6_ao_hash_pseudoheader(struct tcp_sigpool *hp,
const struct in6_addr *daddr,
const struct in6_addr *saddr, int nbytes);
int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
const struct sock *sk, __be32 sisn,
__be32 disn, bool send);
struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk,
struct sock *addr_sk, int sndid, int rcvid);
int tcp_v6_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key,
const struct sock *sk, const struct sk_buff *skb,
const u8 *tkey, int hash_offset, u32 sne);
int tcp_v6_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen);
void tcp_ao_established(struct sock *sk);
void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb);
void tcp_ao_connect_init(struct sock *sk);
void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
struct tcp_request_sock *treq,
unsigned short int family);
#else /* CONFIG_TCP_AO */
static inline int tcp_ao_transmit_skb(struct sock *sk, struct sk_buff *skb,
struct tcp_ao_key *key, struct tcphdr *th,
__u8 *hash_location)
{
return 0;
}
static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
const union tcp_ao_addr *addr, int family, int sndid, int rcvid)
{
return NULL;
}
static inline void tcp_ao_destroy_sock(struct sock *sk, bool twsk)
{
}
static inline void tcp_ao_established(struct sock *sk)
{
}
static inline void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb)
{
}
static inline void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw,
struct tcp_sock *tp)
{
}
static inline void tcp_ao_connect_init(struct sock *sk)
{
}
#endif
#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
int tcp_do_parse_auth_options(const struct tcphdr *th,
const u8 **md5_hash, const u8 **ao_hash);
#else
static inline int tcp_do_parse_auth_options(const struct tcphdr *th,
const u8 **md5_hash, const u8 **ao_hash)
{
*md5_hash = NULL;
*ao_hash = NULL;
return 0;
}
#endif
#endif /* _TCP_AO_H */
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