Messages in this thread Patch in this message | | | From | Dmitry Safonov <> | Subject | [PATCH 6/7] net/tcp: ACCESS_ONCE() on snd/rcv SNEs | Date | Tue, 21 Nov 2023 02:01:10 +0000 |
| |
SNEs need READ_ONCE()/WRITE_ONCE() for access as they can be written and read at the same time.
This is actually a shame: I planned to send it in TCP-AO patches, but it seems I've chosen a wrong commit to git-commit-fixup some time ago. It ended up in a commit that adds a selftest. Human factor.
Fixes: 64382c71a557 ("net/tcp: Add TCP-AO SNE support") Signed-off-by: Dmitry Safonov <dima@arista.com> --- net/ipv4/tcp_ao.c | 4 ++-- net/ipv4/tcp_input.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 122ff58168ee..9b7f1970c2e9 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -956,8 +956,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, if (unlikely(th->syn && !th->ack)) goto verify_hash; - sne = tcp_ao_compute_sne(info->rcv_sne, tcp_sk(sk)->rcv_nxt, - ntohl(th->seq)); + sne = tcp_ao_compute_sne(READ_ONCE(info->rcv_sne), + tcp_sk(sk)->rcv_nxt, ntohl(th->seq)); /* Established socket, traffic key are cached */ traffic_key = rcv_other_key(key); err = tcp_ao_verify_hash(sk, skb, family, info, aoh, key, diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index bcb55d98004c..78896c8be0d4 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3583,7 +3583,7 @@ static void tcp_snd_sne_update(struct tcp_sock *tp, u32 ack) ao = rcu_dereference_protected(tp->ao_info, lockdep_sock_is_held((struct sock *)tp)); if (ao && ack < tp->snd_una) - ao->snd_sne++; + WRITE_ONCE(ao->snd_sne, ao->snd_sne + 1); #endif } @@ -3609,7 +3609,7 @@ static void tcp_rcv_sne_update(struct tcp_sock *tp, u32 seq) ao = rcu_dereference_protected(tp->ao_info, lockdep_sock_is_held((struct sock *)tp)); if (ao && seq < tp->rcv_nxt) - ao->rcv_sne++; + WRITE_ONCE(ao->rcv_sne, ao->rcv_sne + 1); #endif } -- 2.42.0
| |