From 76660afbb7a1ac6bef0be34c4c6e76d7e07b74d7 Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Mon, 29 Jun 2020 22:26:24 +0200 Subject: [PATCH] mptcp: __mptcp_tcp_fallback() returns a struct sock Currently __mptcp_tcp_fallback() always return NULL on incoming connections, because MPTCP does not create the additional socket for the first subflow. Since the previous commit no __mptcp_tcp_fallback() caller needs a struct socket, so let __mptcp_tcp_fallback() return the first subflow sock and cope correctly even with incoming connections. Signed-off-by: Paolo Abeni Signed-off-by: Davide Caratti Reviewed-by: Mat Martineau Signed-off-by: David S. Miller --- net/mptcp/protocol.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index ad619bda71cc..f2b2bd37e371 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -76,14 +76,14 @@ static bool mptcp_is_tcpsk(struct sock *sk) return false; } -static struct socket *__mptcp_tcp_fallback(struct mptcp_sock *msk) +static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk) { sock_owned_by_me((const struct sock *)msk); if (likely(!__mptcp_check_fallback(msk))) return NULL; - return msk->subflow; + return msk->first; } static int __mptcp_socket_create(struct mptcp_sock *msk) @@ -1498,7 +1498,7 @@ static int mptcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen) { struct mptcp_sock *msk = mptcp_sk(sk); - struct socket *ssock; + struct sock *ssk; pr_debug("msk=%p", msk); @@ -1509,11 +1509,10 @@ static int mptcp_setsockopt(struct sock *sk, int level, int optname, * to the one remaining subflow. */ lock_sock(sk); - ssock = __mptcp_tcp_fallback(msk); + ssk = __mptcp_tcp_fallback(msk); release_sock(sk); - if (ssock) - return tcp_setsockopt(ssock->sk, level, optname, optval, - optlen); + if (ssk) + return tcp_setsockopt(ssk, level, optname, optval, optlen); return -EOPNOTSUPP; } @@ -1522,7 +1521,7 @@ static int mptcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *option) { struct mptcp_sock *msk = mptcp_sk(sk); - struct socket *ssock; + struct sock *ssk; pr_debug("msk=%p", msk); @@ -1533,11 +1532,10 @@ static int mptcp_getsockopt(struct sock *sk, int level, int optname, * to the one remaining subflow. */ lock_sock(sk); - ssock = __mptcp_tcp_fallback(msk); + ssk = __mptcp_tcp_fallback(msk); release_sock(sk); - if (ssock) - return tcp_getsockopt(ssock->sk, level, optname, optval, - option); + if (ssk) + return tcp_getsockopt(ssk, level, optname, optval, option); return -EOPNOTSUPP; } -- 2.20.1