net: socket infrastructure for SO_TIMESTAMPING

The overlap with the old SO_TIMESTAMP[NS] options is handled so
that time stamping in software (net_enable_timestamp()) is
enabled when SO_TIMESTAMP[NS] and/or SO_TIMESTAMPING_RX_SOFTWARE
is set.  It's disabled if all of these are off.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 69 insertions, 12 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index 4c64be4f876..40887e76652 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -120,6 +120,7 @@
 #include <net/net_namespace.h>
 #include <net/request_sock.h>
 #include <net/sock.h>
+#include <linux/net_tstamp.h>
 #include <net/xfrm.h>
 #include <linux/ipsec.h>
 
@@ -255,11 +256,14 @@ static void sock_warn_obsolete_bsdism(const char *name)
 	}
 }
 
-static void sock_disable_timestamp(struct sock *sk)
+static void sock_disable_timestamp(struct sock *sk, int flag)
 {
-	if (sock_flag(sk, SOCK_TIMESTAMP)) {
-		sock_reset_flag(sk, SOCK_TIMESTAMP);
-		net_disable_timestamp();
+	if (sock_flag(sk, flag)) {
+		sock_reset_flag(sk, flag);
+		if (!sock_flag(sk, SOCK_TIMESTAMP) &&
+		    !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
+			net_disable_timestamp();
+		}
 	}
 }
 
@@ -614,13 +618,38 @@ set_rcvbuf:
 			else
 				sock_set_flag(sk, SOCK_RCVTSTAMPNS);
 			sock_set_flag(sk, SOCK_RCVTSTAMP);
-			sock_enable_timestamp(sk);
+			sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 		} else {
 			sock_reset_flag(sk, SOCK_RCVTSTAMP);
 			sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
 		}
 		break;
 
+	case SO_TIMESTAMPING:
+		if (val & ~SOF_TIMESTAMPING_MASK) {
+			ret = EINVAL;
+			break;
+		}
+		sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
+				  val & SOF_TIMESTAMPING_TX_HARDWARE);
+		sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
+				  val & SOF_TIMESTAMPING_TX_SOFTWARE);
+		sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
+				  val & SOF_TIMESTAMPING_RX_HARDWARE);
+		if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
+			sock_enable_timestamp(sk,
+					      SOCK_TIMESTAMPING_RX_SOFTWARE);
+		else
+			sock_disable_timestamp(sk,
+					       SOCK_TIMESTAMPING_RX_SOFTWARE);
+		sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
+				  val & SOF_TIMESTAMPING_SOFTWARE);
+		sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
+				  val & SOF_TIMESTAMPING_SYS_HARDWARE);
+		sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
+				  val & SOF_TIMESTAMPING_RAW_HARDWARE);
+		break;
+
 	case SO_RCVLOWAT:
 		if (val < 0)
 			val = INT_MAX;
@@ -768,6 +797,24 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
 		v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
 		break;
 
+	case SO_TIMESTAMPING:
+		v.val = 0;
+		if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
+			v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
+		if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
+			v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
+		if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
+			v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
+		if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
+			v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
+		if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
+			v.val |= SOF_TIMESTAMPING_SOFTWARE;
+		if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
+			v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
+		if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
+			v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
+		break;
+
 	case SO_RCVTIMEO:
 		lv=sizeof(struct timeval);
 		if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
@@ -969,7 +1016,8 @@ void sk_free(struct sock *sk)
 		rcu_assign_pointer(sk->sk_filter, NULL);
 	}
 
-	sock_disable_timestamp(sk);
+	sock_disable_timestamp(sk, SOCK_TIMESTAMP);
+	sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
 
 	if (atomic_read(&sk->sk_omem_alloc))
 		printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
@@ -1787,7 +1835,7 @@ int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 {
 	struct timeval tv;
 	if (!sock_flag(sk, SOCK_TIMESTAMP))
-		sock_enable_timestamp(sk);
+		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 	tv = ktime_to_timeval(sk->sk_stamp);
 	if (tv.tv_sec == -1)
 		return -ENOENT;
@@ -1803,7 +1851,7 @@ int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 {
 	struct timespec ts;
 	if (!sock_flag(sk, SOCK_TIMESTAMP))
-		sock_enable_timestamp(sk);
+		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 	ts = ktime_to_timespec(sk->sk_stamp);
 	if (ts.tv_sec == -1)
 		return -ENOENT;
@@ -1815,11 +1863,20 @@ int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 }
 EXPORT_SYMBOL(sock_get_timestampns);
 
-void sock_enable_timestamp(struct sock *sk)
+void sock_enable_timestamp(struct sock *sk, int flag)
 {
-	if (!sock_flag(sk, SOCK_TIMESTAMP)) {
-		sock_set_flag(sk, SOCK_TIMESTAMP);
-		net_enable_timestamp();
+	if (!sock_flag(sk, flag)) {
+		sock_set_flag(sk, flag);
+		/*
+		 * we just set one of the two flags which require net
+		 * time stamping, but time stamping might have been on
+		 * already because of the other one
+		 */
+		if (!sock_flag(sk,
+				flag == SOCK_TIMESTAMP ?
+				SOCK_TIMESTAMPING_RX_SOFTWARE :
+				SOCK_TIMESTAMP))
+			net_enable_timestamp();
 	}
 }