[MPTCP] [PATCH mptcp-next 7/9] mptcp: setsockopt: SO_DEBUG and no-op options

[Florian Westphal <fw at strlen.de>]

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

Signed-off-by: Florian Westphal <fw(a)strlen.de>
---
 net/mptcp/sockopt.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index e2cc6e11e777..3ba31f4a73e3 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -35,6 +35,32 @@ static int mptcp_get_int_option(struct mptcp_sock *msk, sockptr_t optval, unsign
 	return 0;
 }
 
+static int mptcp_so_debug(struct mptcp_sock *msk, int val)
+{
+	sockptr_t optval = KERNEL_SOCKPTR(&val);
+	struct mptcp_subflow_context *subflow;
+	struct sock *sk = (struct sock *)msk;
+	int ret;
+
+	ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, SO_DEBUG,
+			      optval, sizeof(val));
+	if (ret)
+		return ret;
+
+	lock_sock(sk);
+
+	mptcp_for_each_subflow(msk, subflow) {
+		struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
+		bool slow = lock_sock_fast(ssk);
+
+		sock_valbool_flag(ssk, SOCK_DBG, !!val);
+		unlock_sock_fast(ssk, slow);
+	}
+
+	release_sock(sk);
+	return 0;
+}
+
 static int mptcp_so_mark(struct mptcp_sock *msk, int val)
 {
 	sockptr_t optval = KERNEL_SOCKPTR(&val);
@@ -169,6 +195,8 @@ static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname,
 		return ret;
 
 	switch (optname) {
+	case SO_DEBUG:
+		return mptcp_so_debug(msk, val);
 	case SO_MARK:
 		return mptcp_so_mark(msk, val);
 	case SO_KEEPALIVE:
@@ -268,9 +296,21 @@ 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);
@@ -602,6 +642,7 @@ static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk)
 		sk_dst_reset(ssk);
 	}
 
+	sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG));
 	unlock_sock_fast(ssk, slow);
 }
 
-- 
2.26.2