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mptcp: sockopt: add TCP_DEFER_ACCEPT support
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Support this via passthrough to the underlying tcp listener socket.

Closes: #271
Reviewed-by: Mat Martineau <[email protected]>
Signed-off-by: Florian Westphal <[email protected]>
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Florian Westphal authored and jenkins-tessares committed May 14, 2022
1 parent 50f7bdb commit 40194c4
Showing 1 changed file with 15 additions and 0 deletions.
15 changes: 15 additions & 0 deletions net/mptcp/sockopt.c
Original file line number Diff line number Diff line change
Expand Up @@ -756,6 +756,18 @@ static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname,
return -EOPNOTSUPP;
}

static int mptcp_setsockopt_sol_tcp_defer(struct mptcp_sock *msk, sockptr_t optval,
unsigned int optlen)
{
struct socket *listener;

listener = __mptcp_nmpc_socket(msk);
if (!listener)
return 0; /* TCP_DEFER_ACCEPT does not fail */

return tcp_setsockopt(listener->sk, SOL_TCP, TCP_DEFER_ACCEPT, optval, optlen);
}

static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
sockptr_t optval, unsigned int optlen)
{
Expand All @@ -782,6 +794,8 @@ static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
return mptcp_setsockopt_sol_tcp_cork(msk, optval, optlen);
case TCP_NODELAY:
return mptcp_setsockopt_sol_tcp_nodelay(msk, optval, optlen);
case TCP_DEFER_ACCEPT:
return mptcp_setsockopt_sol_tcp_defer(msk, optval, optlen);
}

return -EOPNOTSUPP;
Expand Down Expand Up @@ -1142,6 +1156,7 @@ static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
case TCP_CONGESTION:
case TCP_INFO:
case TCP_CC_INFO:
case TCP_DEFER_ACCEPT:
return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname,
optval, optlen);
case TCP_INQ:
Expand Down

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