[RFC PATCH mptcp-next v2 7/8] mptcp: setsockopt: SO_DEBUG and no-op options

[Florian Westphal <fw@strlen.de>]

Handle SO_DEBUG and set it on all subflows.
Ignore those values not implemented on TCP sockets.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 net/mptcp/sockopt.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 6d59b25f3658..d345ebc3947a 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -48,6 +48,9 @@ static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, in
 		bool slow = lock_sock_fast(ssk);
 
 		switch (optname) {
+		case SO_DEBUG:
+			sock_valbool_flag(ssk, SOCK_DBG, !!val);
+			break;
 		case SO_KEEPALIVE:
 			if (ssk->sk_prot->keepalive)
 				ssk->sk_prot->keepalive(ssk, !!val);
@@ -121,6 +124,7 @@ static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname,
 	case SO_KEEPALIVE:
 		mptcp_sol_socket_sync_intval(msk, optname, val);
 		return 0;
+	case SO_DEBUG:
 	case SO_MARK:
 	case SO_PRIORITY:
 	case SO_SNDBUF:
@@ -217,9 +221,21 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
 	case SO_RCVBUFFORCE:
 	case SO_MARK:
 	case SO_INCOMING_CPU:
+	case SO_DEBUG:
 		return mptcp_setsockopt_sol_socket_int(msk, optname, optval, optlen);
 	case SO_LINGER:
 		return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen);
+	case SO_NO_CHECK:
+	case SO_DONTROUTE:
+	case SO_BROADCAST:
+	case SO_BSDCOMPAT:
+	case SO_PASSCRED:
+	case SO_PASSSEC:
+	case SO_RXQ_OVFL:
+	case SO_WIFI_STATUS:
+	case SO_NOFCS:
+	case SO_SELECT_ERR_QUEUE:
+		return 0;
 	}
 
 	return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);
@@ -551,6 +567,8 @@ static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk)
 		ssk->sk_mark = sk->sk_mark;
 		sk_dst_reset(ssk);
 	}
+
+	sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG));
 }
 
 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk)
-- 
2.26.3