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mptcp: implement dummy MSG_ERRQUEUE support 

mptcp_recvmsg() currently silently ignores MSG_ERRQUEUE, returning
input data instead of error cmsg.

This change provides a dummy implementation for MSG_ERRQUEUE - always
returns no data. That is consistent with the current lack of a suitable
IP_RECVERR setsockopt() support.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-04-23 11:17:05 -07:00 committed by David S. Miller
parent b1ce98c70e
commit cb9d80f494
1 changed files with 4 additions and 0 deletions
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4
net/mptcp/protocol.c
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@ -1945,6 +1945,10 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
int target; int target;
long timeo; long timeo;
/* MSG_ERRQUEUE is really a no-op till we support IP_RECVERR */
if (unlikely(flags & MSG_ERRQUEUE))
return inet_recv_error(sk, msg, len, addr_len);
if (msg->msg_flags & ~(MSG_WAITALL | MSG_DONTWAIT)) if (msg->msg_flags & ~(MSG_WAITALL | MSG_DONTWAIT))
return -EOPNOTSUPP; return -EOPNOTSUPP;