netdev - [PATCHv2 net-next 3/7] sctp: check sk_bound_dev_if when matching ep in get

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Message-Id: <e621dbb3322ab482fec055ed22ab385d598f9ebc.1668628394.git.lucien.xin@gmail.com>
Date:   Wed, 16 Nov 2022 15:01:18 -0500
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        David Ahern <dsahern@...il.com>,
        Carlo Carraro <colrack@...il.com>
Subject: [PATCHv2 net-next 3/7] sctp: check sk_bound_dev_if when matching ep in get_port

In sctp_get_port_local(), when binding to IP and PORT, it should
also check sk_bound_dev_if to match listening sk if it's set by
SO_BINDTOIFINDEX, so that multiple sockets with the same IP and
PORT, but different sk_bound_dev_if can be listened at the same
time.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/sctp/socket.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 3e83963d1b8a..4306164238ef 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -8398,6 +8398,7 @@ static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
 		 * in an endpoint.
 		 */
 		sk_for_each_bound(sk2, &pp->owner) {
+			int bound_dev_if2 = READ_ONCE(sk2->sk_bound_dev_if);
 			struct sctp_sock *sp2 = sctp_sk(sk2);
 			struct sctp_endpoint *ep2 = sp2->ep;
 
@@ -8408,7 +8409,9 @@ static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
 			     uid_eq(uid, sock_i_uid(sk2))))
 				continue;
 
-			if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
+			if ((!sk->sk_bound_dev_if || !bound_dev_if2 ||
+			     sk->sk_bound_dev_if == bound_dev_if2) &&
+			    sctp_bind_addr_conflict(&ep2->base.bind_addr,
 						    addr, sp2, sp)) {
 				ret = 1;
 				goto fail_unlock;
-- 
2.31.1