[PATCH net-next 2/8] mptcp: propagate sk_ipv6only to subflows

From: Matthieu Baerts <matthieu.baerts@tessares.net>
To: Mat Martineau <mathew.j.martineau@linux.intel.com>,
	 Matthieu Baerts <matthieu.baerts@tessares.net>,
	 "David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	 Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>,  Shuah Khan <shuah@kernel.org>
Cc: netdev@vger.kernel.org, mptcp@lists.linux.dev,
	 linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: [PATCH net-next 2/8] mptcp: propagate sk_ipv6only to subflows
Date: Wed, 25 Jan 2023 11:47:22 +0100	[thread overview]
Message-ID: <20230123-upstream-net-next-pm-v4-v6-v1-2-43fac502bfbf@tessares.net> (raw)
In-Reply-To: <20230123-upstream-net-next-pm-v4-v6-v1-0-43fac502bfbf@tessares.net>

Usually, attributes are propagated to subflows as well.

Here, if subflows are created by other ways than the MPTCP path-manager,
it is important to make sure they are in v6 if it is asked by the
userspace.

Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
---
 net/mptcp/sockopt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 582ed93bcc8a..9986681aaf40 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -1255,6 +1255,7 @@ static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk)
 	ssk->sk_priority = sk->sk_priority;
 	ssk->sk_bound_dev_if = sk->sk_bound_dev_if;
 	ssk->sk_incoming_cpu = sk->sk_incoming_cpu;
+	ssk->sk_ipv6only = sk->sk_ipv6only;
 	__ip_sock_set_tos(ssk, inet_sk(sk)->tos);
 
 	if (sk->sk_userlocks & tx_rx_locks) {

-- 
2.38.1

