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tcp: Check hlist_empty(&tb->bhash2) instead of hlist_empty(&tb->owners).

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We use hlist_empty(&tb->owners) to check if the bhash bucket has a socket.
We can check the child bhash2 buckets instead.

For this to work, the bhash2 bucket must be freed before the bhash bucket.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kuniyuki Iwashima 2023-12-19 09:18:30 +09:00 committed by David S. Miller
parent b82ba728cc
commit 8002d44fe8
3 changed files with 8 additions and 9 deletions
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9
net/ipv4/inet_connection_sock.c
View File

@ -474,7 +474,7 @@ void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
kuid_t uid = sock_i_uid(sk);
bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN;
if (hlist_empty(&tb->owners)) {
if (hlist_empty(&tb->bhash2)) {
tb->fastreuse = reuse;
if (sk->sk_reuseport) {
tb->fastreuseport = FASTREUSEPORT_ANY;
@ -566,7 +566,7 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
}
if (!found_port) {
if (!hlist_empty(&tb->owners)) {
if (!hlist_empty(&tb->bhash2)) {
if (sk->sk_reuse == SK_FORCE_REUSE ||
(tb->fastreuse > 0 && reuse) ||
sk_reuseport_match(tb, sk))
@ -608,11 +608,10 @@ success:
fail_unlock:
if (ret) {
if (bhash2_created)
inet_bind2_bucket_destroy(hinfo->bind2_bucket_cachep, tb2);
if (bhash_created)
inet_bind_bucket_destroy(hinfo->bind_bucket_cachep, tb);
if (bhash2_created)
inet_bind2_bucket_destroy(hinfo->bind2_bucket_cachep,
tb2);
}
if (head2_lock_acquired)
spin_unlock(&head2->lock);

6
net/ipv4/inet_hashtables.c
View File

@ -88,7 +88,7 @@ struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
*/
void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
{
if (hlist_empty(&tb->owners)) {
if (hlist_empty(&tb->bhash2)) {
__hlist_del(&tb->node);
kmem_cache_free(cachep, tb);
}
@ -195,7 +195,6 @@ static void __inet_put_port(struct sock *sk)
__sk_del_bind_node(sk);
inet_csk(sk)->icsk_bind_hash = NULL;
inet_sk(sk)->inet_num = 0;
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
spin_lock(&head2->lock);
if (inet_csk(sk)->icsk_bind2_hash) {
@ -207,6 +206,7 @@ static void __inet_put_port(struct sock *sk)
}
spin_unlock(&head2->lock);
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
spin_unlock(&head->lock);
}
@ -1062,7 +1062,7 @@ other_parity_scan:
if (tb->fastreuse >= 0 ||
tb->fastreuseport >= 0)
goto next_port;
WARN_ON(hlist_empty(&tb->owners));
WARN_ON(hlist_empty(&tb->bhash2));
if (!check_established(death_row, sk,
port, &tw))
goto ok;

2
net/ipv4/inet_timewait_sock.c
View File

@ -37,11 +37,11 @@ void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
__hlist_del(&tw->tw_bind_node);
tw->tw_tb = NULL;
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
__hlist_del(&tw->tw_bind2_node);
tw->tw_tb2 = NULL;
inet_bind2_bucket_destroy(hashinfo->bind2_bucket_cachep, tb2);
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
__sock_put((struct sock *)tw);
}