netdev - [net-next, v4, 07/11] mptcp: setsockopt: convert to mptcp_setsockopt_sol_socket

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Date:   Fri, 25 Jun 2021 17:35:09 +0800
From:   Yangbo Lu <yangbo.lu@....com>
To:     netdev@...r.kernel.org
Cc:     Yangbo Lu <yangbo.lu@....com>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, mptcp@...ts.linux.dev,
        Richard Cochran <richardcochran@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Shuah Khan <shuah@...nel.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Rui Sousa <rui.sousa@....com>,
        Sebastien Laveze <sebastien.laveze@....com>
Subject: [net-next, v4, 07/11] mptcp: setsockopt: convert to mptcp_setsockopt_sol_socket_timestamping()

Split timestamping handling into a new function
mptcp_setsockopt_sol_socket_timestamping().
This is preparation for extending SO_TIMESTAMPING
for PHC binding, since optval will no longer be
integer.

Signed-off-by: Yangbo Lu <yangbo.lu@....com>
---
Changes for v4:
	- Added this patch.
---
 net/mptcp/sockopt.c | 57 +++++++++++++++++++++++++++++++--------------
 1 file changed, 40 insertions(+), 17 deletions(-)

diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 092d1f635d27..ea38cbcd2ad4 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -157,19 +157,7 @@ static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optnam
 		struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
 		bool slow = lock_sock_fast(ssk);
 
-		switch (optname) {
-		case SO_TIMESTAMP_OLD:
-		case SO_TIMESTAMP_NEW:
-		case SO_TIMESTAMPNS_OLD:
-		case SO_TIMESTAMPNS_NEW:
-			sock_set_timestamp(sk, optname, !!val);
-			break;
-		case SO_TIMESTAMPING_NEW:
-		case SO_TIMESTAMPING_OLD:
-			sock_set_timestamping(sk, optname, val);
-			break;
-		}
-
+		sock_set_timestamp(sk, optname, !!val);
 		unlock_sock_fast(ssk, slow);
 	}
 
@@ -178,7 +166,8 @@ static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optnam
 }
 
 static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname,
-					   sockptr_t optval, unsigned int optlen)
+					   sockptr_t optval,
+					   unsigned int optlen)
 {
 	int val, ret;
 
@@ -205,14 +194,45 @@ static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname,
 	case SO_TIMESTAMP_NEW:
 	case SO_TIMESTAMPNS_OLD:
 	case SO_TIMESTAMPNS_NEW:
-	case SO_TIMESTAMPING_OLD:
-	case SO_TIMESTAMPING_NEW:
 		return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val);
 	}
 
 	return -ENOPROTOOPT;
 }
 
+static int mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk,
+						    int optname,
+						    sockptr_t optval,
+						    unsigned int optlen)
+{
+	struct mptcp_subflow_context *subflow;
+	struct sock *sk = (struct sock *)msk;
+	int val, ret;
+
+	ret = mptcp_get_int_option(msk, optval, optlen, &val);
+	if (ret)
+		return ret;
+
+	ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
+			      KERNEL_SOCKPTR(&val), 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_set_timestamping(sk, optname, val);
+		unlock_sock_fast(ssk, slow);
+	}
+
+	release_sock(sk);
+
+	return 0;
+}
+
 static int mptcp_setsockopt_sol_socket_linger(struct mptcp_sock *msk, sockptr_t optval,
 					      unsigned int optlen)
 {
@@ -299,9 +319,12 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
 	case SO_TIMESTAMP_NEW:
 	case SO_TIMESTAMPNS_OLD:
 	case SO_TIMESTAMPNS_NEW:
+		return mptcp_setsockopt_sol_socket_int(msk, optname, optval,
+						       optlen);
 	case SO_TIMESTAMPING_OLD:
 	case SO_TIMESTAMPING_NEW:
-		return mptcp_setsockopt_sol_socket_int(msk, optname, optval, optlen);
+		return mptcp_setsockopt_sol_socket_timestamping(msk, optname,
+								optval, optlen);
 	case SO_LINGER:
 		return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen);
 	case SO_RCVLOWAT:
-- 
2.25.1