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mptcp: support IPV6_V6ONLY setsockopt

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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: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2020-07-05 01:30:17 +02:00 committed by David S. Miller
parent fd1452d8ef
commit c9b95a1359
1 changed files with 30 additions and 0 deletions
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30
net/mptcp/protocol.c
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@ -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;
}