[NET]: Adding SO_TIMESTAMPNS / SCM_TIMESTAMPNS support

Now that network timestamps use ktime_t infrastructure, we can add a new
SOL_SOCKET sockopt  SO_TIMESTAMPNS.

This command is similar to SO_TIMESTAMP, but permits transmission of
a 'timespec struct' instead of a 'timeval struct' control message.
(nanosecond resolution instead of microsecond)

Control message is labelled SCM_TIMESTAMPNS instead of SCM_TIMESTAMP

A socket cannot mix SO_TIMESTAMP and SO_TIMESTAMPNS : the two modes are
mutually exclusive.

sock_recv_timestamp() became too big to be fully inlined so I added a
__sock_recv_timestamp() helper function.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
CC: linux-arch@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

include/asm-alpha/socket.h

@@ -52,6 +52,8 @@
 
 #define SO_PEERSEC		30
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 /* Security levels - as per NRL IPv6 - don't actually do anything */
 #define SO_SECURITY_AUTHENTICATION		19

include/asm-arm/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_SOCKET_H */

include/asm-arm26/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_SOCKET_H */

include/asm-avr32/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* __ASM_AVR32_SOCKET_H */

include/asm-cris/socket.h

@@ -51,6 +51,8 @@
 
 #define SO_PEERSEC             31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_SOCKET_H */
 

include/asm-frv/socket.h

@@ -49,6 +49,8 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_SOCKET_H */
 

include/asm-h8300/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_SOCKET_H */

include/asm-i386/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_SOCKET_H */

include/asm-ia64/socket.h

@@ -58,5 +58,7 @@
 
 #define SO_PEERSEC             31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_IA64_SOCKET_H */

include/asm-m32r/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_M32R_SOCKET_H */

include/asm-m68k/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC             31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_SOCKET_H */

include/asm-mips/socket.h

@@ -70,6 +70,8 @@ To add: #define SO_REUSEPORT 0x0200	/* Allow local address and port reuse.  */
 #define SO_SNDBUFFORCE		31
 #define SO_RCVBUFFORCE		33
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #ifdef __KERNEL__
 

include/asm-parisc/socket.h

@@ -33,6 +33,8 @@
 #define SO_PEERCRED	0x4011
 #define SO_TIMESTAMP	0x4012
 #define SCM_TIMESTAMP	SO_TIMESTAMP
+#define SO_TIMESTAMPNS	0x4013
+#define SCM_TIMESTAMPNS	SO_TIMESTAMPNS
 
 /* Security levels - as per NRL IPv6 - don't actually do anything */
 #define SO_SECURITY_AUTHENTICATION		0x4016

include/asm-powerpc/socket.h

@@ -56,5 +56,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif	/* _ASM_POWERPC_SOCKET_H */

include/asm-s390/socket.h

@@ -57,5 +57,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_SOCKET_H */

include/asm-sh/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* __ASM_SH_SOCKET_H */

include/asm-sparc/socket.h

@@ -49,6 +49,8 @@
 
 #define SO_PEERSEC		0x001e
 #define SO_PASSSEC		0x001f
+#define SO_TIMESTAMPNS		0x0021
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 /* Security levels - as per NRL IPv6 - don't actually do anything */
 #define SO_SECURITY_AUTHENTICATION		0x5001

include/asm-sparc64/socket.h

@@ -49,6 +49,8 @@
 
 #define SO_PEERSEC		0x001e
 #define SO_PASSSEC		0x001f
+#define SO_TIMESTAMPNS		0x0021
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 /* Security levels - as per NRL IPv6 - don't actually do anything */
 #define SO_SECURITY_AUTHENTICATION		0x5001

include/asm-v850/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* __V850_SOCKET_H__ */

include/asm-x86_64/socket.h

@@ -49,5 +49,7 @@
 
 #define SO_PEERSEC             31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif /* _ASM_SOCKET_H */

include/asm-xtensa/socket.h

@@ -60,5 +60,7 @@
 #define SO_ACCEPTCONN		30
 #define SO_PEERSEC		31
 #define SO_PASSSEC		34
+#define SO_TIMESTAMPNS		35
+#define SCM_TIMESTAMPNS		SO_TIMESTAMPNS
 
 #endif	/* _XTENSA_SOCKET_H */

include/net/sock.h

@@ -390,6 +390,7 @@ enum sock_flags {
 	SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */
 	SOCK_DBG, /* %SO_DEBUG setting */
 	SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */
+	SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */
 	SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
 	SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
 };
@@ -1283,21 +1284,17 @@ static inline int sock_intr_errno(long timeo)
 	return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR;
 }
 
+extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
+	struct sk_buff *skb);
+
 static __inline__ void
 sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
 {
 	ktime_t kt = skb->tstamp;
 
-	if (sock_flag(sk, SOCK_RCVTSTAMP)) {
-		struct timeval tv;
-		/* Race occurred between timestamp enabling and packet
-		   receiving.  Fill in the current time for now. */
-		if (kt.tv64 == 0)
-			kt = ktime_get_real();
-		skb->tstamp = kt;
-		tv = ktime_to_timeval(kt);
-		put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP, sizeof(tv), &tv);
-	} else
+	if (sock_flag(sk, SOCK_RCVTSTAMP))
+		__sock_recv_timestamp(msg, sk, skb);
+	else
 		sk->sk_stamp = kt;
 }
 

net/compat.c

@@ -215,6 +215,7 @@ Efault:
 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 {
 	struct compat_timeval ctv;
+	struct compat_timespec cts;
 	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 	struct compat_cmsghdr cmhdr;
 	int cmlen;
@@ -229,7 +230,14 @@ int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *dat
 		ctv.tv_sec = tv->tv_sec;
 		ctv.tv_usec = tv->tv_usec;
 		data = &ctv;
-		len = sizeof(struct compat_timeval);
+		len = sizeof(ctv);
+	}
+	if (level == SOL_SOCKET && type == SO_TIMESTAMPNS) {
+		struct timespec *ts = (struct timespec *)data;
+		cts.tv_sec = ts->tv_sec;
+		cts.tv_nsec = ts->tv_nsec;
+		data = &cts;
+		len = sizeof(cts);
 	}
 
 	cmlen = CMSG_COMPAT_LEN(len);

net/core/sock.c

@@ -521,11 +521,18 @@ set_rcvbuf:
 		break;
 
 	case SO_TIMESTAMP:
+	case SO_TIMESTAMPNS:
 		if (valbool)  {
+			if (optname == SO_TIMESTAMP)
+				sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
+			else
+				sock_set_flag(sk, SOCK_RCVTSTAMPNS);
 			sock_set_flag(sk, SOCK_RCVTSTAMP);
 			sock_enable_timestamp(sk);
-		} else
+		} else {
 			sock_reset_flag(sk, SOCK_RCVTSTAMP);
+			sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
+		}
 		break;
 
 	case SO_RCVLOWAT:
@@ -715,7 +722,12 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
 		break;
 
 	case SO_TIMESTAMP:
-		v.val = sock_flag(sk, SOCK_RCVTSTAMP);
+		v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
+				!sock_flag(sk, SOCK_RCVTSTAMPNS);
+		break;
+
+	case SO_TIMESTAMPNS:
+		v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
 		break;
 
 	case SO_RCVTIMEO:

net/socket.c

@@ -585,6 +585,35 @@ int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
 	return result;
 }
 
+/*
+ * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
+ */
+void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
+	struct sk_buff *skb)
+{
+	ktime_t kt = skb->tstamp;
+
+	if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
+		struct timeval tv;
+		/* Race occurred between timestamp enabling and packet
+		   receiving.  Fill in the current time for now. */
+		if (kt.tv64 == 0)
+			kt = ktime_get_real();
+		skb->tstamp = kt;
+		tv = ktime_to_timeval(kt);
+		put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, sizeof(tv), &tv);
+	} else {
+		struct timespec ts;
+		/* Race occurred between timestamp enabling and packet
+		   receiving.  Fill in the current time for now. */
+		if (kt.tv64 == 0)
+			kt = ktime_get_real();
+		skb->tstamp = kt;
+		ts = ktime_to_timespec(kt);
+		put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, sizeof(ts), &ts);
+	}
+}
+
 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 				 struct msghdr *msg, size_t size, int flags)
 {