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tcp: Iterate tb->bhash2 in inet_csk_bind_conflict().

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Sockets in bhash are also linked to bhash2, but TIME_WAIT sockets
are linked separately in tb2->deathrow.

Let's replace tb->owners iteration in inet_csk_bind_conflict() with
two iterations over tb2->owners and tb2->deathrow.

This can be done safely under bhash's lock because socket insertion/
deletion in bhash2 happens with bhash's lock held.

Note that twsk_for_each_bound_bhash() will be removed later.

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 09:18:29 +09:00 committed by David S. Miller
parent 58655bc0ad
commit b82ba728cc
1 changed files with 17 additions and 1 deletions
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18
net/ipv4/inet_connection_sock.c
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@ -236,6 +236,14 @@ static bool inet_bhash2_conflict(const struct sock *sk,
return false;
}
#define sk_for_each_bound_bhash(__sk, __tb2, __tb) \
hlist_for_each_entry(__tb2, &(__tb)->bhash2, bhash_node) \
sk_for_each_bound_bhash2(sk2, &(__tb2)->owners)
#define twsk_for_each_bound_bhash(__sk, __tb2, __tb) \
hlist_for_each_entry(__tb2, &(__tb)->bhash2, bhash_node) \
sk_for_each_bound_bhash2(sk2, &(__tb2)->deathrow)
/* This should be called only when the tb and tb2 hashbuckets' locks are held */
static int inet_csk_bind_conflict(const struct sock *sk,
const struct inet_bind_bucket *tb,
@ -267,7 +275,15 @@ static int inet_csk_bind_conflict(const struct sock *sk,
* in tb->owners and tb2->owners list belong
* to the same net - the one this bucket belongs to.
*/
sk_for_each_bound(sk2, &tb->owners) {
sk_for_each_bound_bhash(sk2, tb2, tb) {
if (!inet_bind_conflict(sk, sk2, uid, relax, reuseport_cb_ok, reuseport_ok))
continue;
if (inet_rcv_saddr_equal(sk, sk2, true))
return true;
}
twsk_for_each_bound_bhash(sk2, tb2, tb) {
if (!inet_bind_conflict(sk, sk2, uid, relax, reuseport_cb_ok, reuseport_ok))
continue;