Commit c9b95a13 authored by Florian Westphal's avatar Florian Westphal Committed by David S. Miller
Browse files

mptcp: support IPV6_V6ONLY setsockopt 



Without this, Opensshd fails to open an ipv6 socket listening
socket:
  error: setsockopt IPV6_V6ONLY: Operation not supported
  error: Bind to port 22 on :: failed: Address already in use.

Opensshd opens an ipv4 and and ipv6 listening socket, but because
IPV6_V6ONLY setsockopt fails, the port number is already in use.

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fd1452d8

net/mptcp/protocol.c

+30 −0
Original line number Diff line number Diff line
@@ -1632,6 +1632,33 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname, 
	return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);

}



static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,

			       char __user *optval, unsigned int optlen)

{

	struct sock *sk = (struct sock *)msk;

	int ret = -EOPNOTSUPP;

	struct socket *ssock;



	switch (optname) {

	case IPV6_V6ONLY:

		lock_sock(sk);

		ssock = __mptcp_nmpc_socket(msk);

		if (!ssock) {

			release_sock(sk);

			return -EINVAL;

		}



		ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen);

		if (ret == 0)

			sk->sk_ipv6only = ssock->sk->sk_ipv6only;



		release_sock(sk);

		break;

	}



	return ret;

}



static int mptcp_setsockopt(struct sock *sk, int level, int optname,

			    char __user *optval, unsigned int optlen)

{
@@ -1655,6 +1682,9 @@ static int mptcp_setsockopt(struct sock *sk, int level, int optname, 
	if (ssk)

		return tcp_setsockopt(ssk, level, optname, optval, optlen);



	if (level == SOL_IPV6)

		return mptcp_setsockopt_v6(msk, optname, optval, optlen);



	return -EOPNOTSUPP;

}