diff options
| author | Dmitry Safonov <dima@arista.com> | 2023-10-23 20:22:12 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-10-27 10:35:45 +0100 |
| commit | 67fa83f7c86a86913ab9cd5a13b4bebd8d2ebb43 (patch) | |
| tree | a08a7cdd4c208883f96a724379ff871cffe9a76a /include/net/tcp.h | |
| parent | d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 (diff) | |
| download | linux-67fa83f7c86a86913ab9cd5a13b4bebd8d2ebb43.tar.gz | |
net/tcp: Add static_key for TCP-AO
Similarly to TCP-MD5, add a static key to TCP-AO that is patched out
when there are no keys on a machine and dynamically enabled with the
first setsockopt(TCP_AO) adds a key on any socket. The static key is as
well dynamically disabled later when the socket is destructed.
The lifetime of enabled static key here is the same as ao_info: it is
enabled on allocation, passed over from full socket to twsk and
destructed when ao_info is scheduled for destruction.
Signed-off-by: Dmitry Safonov <dima@arista.com>
Acked-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 54226d85feb8e..e3617c433cf15 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2288,14 +2288,18 @@ static inline void tcp_get_current_key(const struct sock *sk, #if defined(CONFIG_TCP_AO) || defined(CONFIG_TCP_MD5SIG) const struct tcp_sock *tp = tcp_sk(sk); #endif -#ifdef CONFIG_TCP_AO - struct tcp_ao_info *ao; - ao = rcu_dereference_protected(tp->ao_info, lockdep_sock_is_held(sk)); - if (ao) { - out->ao_key = READ_ONCE(ao->current_key); - out->type = TCP_KEY_AO; - return; +#ifdef CONFIG_TCP_AO + if (static_branch_unlikely(&tcp_ao_needed.key)) { + struct tcp_ao_info *ao; + + ao = rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held(sk)); + if (ao) { + out->ao_key = READ_ONCE(ao->current_key); + out->type = TCP_KEY_AO; + return; + } } #endif #ifdef CONFIG_TCP_MD5SIG @@ -2324,7 +2328,8 @@ static inline bool tcp_key_is_md5(const struct tcp_key *key) static inline bool tcp_key_is_ao(const struct tcp_key *key) { #ifdef CONFIG_TCP_AO - if (key->type == TCP_KEY_AO) + if (static_branch_unlikely(&tcp_ao_needed.key) && + key->type == TCP_KEY_AO) return true; #endif return false; @@ -2718,6 +2723,9 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr, struct tcp_ao_info *ao_info; struct tcp_ao_key *ao_key; + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return false; + ao_info = rcu_dereference_check(tcp_sk(sk)->ao_info, lockdep_sock_is_held(sk)); if (!ao_info) |