[PATCH 06/33] net: add sock_set_timestamps

[Christoph Hellwig]

Add a helper to directly set the SO_TIMESTAMP* sockopts from kernel space
without going through a fake uaccess.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 include/net/sock.h       |  1 +
 net/core/sock.c          | 47 +++++++++++++++++++++++++---------------
 net/rxrpc/local_object.c |  8 +------
 3 files changed, 31 insertions(+), 25 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index b63ea15362065..cf8a30e0168de 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2692,5 +2692,6 @@ void sock_set_linger(struct sock *sk, bool onoff, unsigned int linger);
 void sock_set_priority(struct sock *sk, u32 priority);
 void sock_set_sndtimeo(struct sock *sk, unsigned int secs);
 int sock_bindtoindex(struct sock *sk, int ifindex);
+void sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns);
 
 #endif	/* _SOCK_H */
diff --git a/net/core/sock.c b/net/core/sock.c
index 4b7439308caec..1589f242ecc7e 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -772,6 +772,28 @@ void sock_set_sndtimeo(struct sock *sk, unsigned int secs)
 }
 EXPORT_SYMBOL(sock_set_sndtimeo);
 
+static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
+{
+	if (val)  {
+		sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
+		sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
+		sock_set_flag(sk, SOCK_RCVTSTAMP);
+		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
+	} else {
+		sock_reset_flag(sk, SOCK_RCVTSTAMP);
+		sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
+		sock_reset_flag(sk, SOCK_TSTAMP_NEW);
+	}
+}
+
+void sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
+{
+	lock_sock(sk);
+	__sock_set_timestamps(sk, val, new, ns);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_timestamps);
+
 /*
  *	This is meant for all protocols to use and covers goings on
  *	at the socket level. Everything here is generic.
@@ -953,28 +975,17 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 		break;
 
 	case SO_TIMESTAMP_OLD:
+		__sock_set_timestamps(sk, valbool, false, false);
+		break;
 	case SO_TIMESTAMP_NEW:
+		__sock_set_timestamps(sk, valbool, true, false);
+		break;
 	case SO_TIMESTAMPNS_OLD:
+		__sock_set_timestamps(sk, valbool, false, true);
+		break;
 	case SO_TIMESTAMPNS_NEW:
-		if (valbool)  {
-			if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW)
-				sock_set_flag(sk, SOCK_TSTAMP_NEW);
-			else
-				sock_reset_flag(sk, SOCK_TSTAMP_NEW);
-
-			if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW)
-				sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
-			else
-				sock_set_flag(sk, SOCK_RCVTSTAMPNS);
-			sock_set_flag(sk, SOCK_RCVTSTAMP);
-			sock_enable_timestamp(sk, SOCK_TIMESTAMP);
-		} else {
-			sock_reset_flag(sk, SOCK_RCVTSTAMP);
-			sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
-			sock_reset_flag(sk, SOCK_TSTAMP_NEW);
-		}
+		__sock_set_timestamps(sk, valbool, true, true);
 		break;
-
 	case SO_TIMESTAMPING_NEW:
 		sock_set_flag(sk, SOCK_TSTAMP_NEW);
 		/* fall through */
diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c
index 01135e54d95d2..562ea36c96b0f 100644
--- a/net/rxrpc/local_object.c
+++ b/net/rxrpc/local_object.c
@@ -189,13 +189,7 @@ static int rxrpc_open_socket(struct rxrpc_local *local, struct net *net)
 		}
 
 		/* We want receive timestamps. */
-		opt = 1;
-		ret = kernel_setsockopt(local->socket, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
-					(char *)&opt, sizeof(opt));
-		if (ret < 0) {
-			_debug("setsockopt failed");
-			goto error;
-		}
+		sock_set_timestamps(local->socket->sk, true, false, true);
 		break;
 
 	default:
-- 
2.26.2