[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>

25 files changed, 101 insertions, 13 deletions

diff --git a/include/asm-alpha/socket.h b/include/asm-alpha/socket.h
index d22ab97ea72e..1fede7f92860 100644
--- a/include/asm-alpha/socket.h
+++ b/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
diff --git a/include/asm-arm/socket.h b/include/asm-arm/socket.h
index 19f7df702b06..65a1a64bf934 100644
--- a/include/asm-arm/socket.h
+++ b/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 */
diff --git a/include/asm-arm26/socket.h b/include/asm-arm26/socket.h
index 19f7df702b06..65a1a64bf934 100644
--- a/include/asm-arm26/socket.h
+++ b/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 */
diff --git a/include/asm-avr32/socket.h b/include/asm-avr32/socket.h
index 543229de8173..a0d0507a5034 100644
--- a/include/asm-avr32/socket.h
+++ b/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 */
diff --git a/include/asm-cris/socket.h b/include/asm-cris/socket.h
index 01cfdf1d6d33..5b18dfdf1748 100644
--- a/include/asm-cris/socket.h
+++ b/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 */
 
diff --git a/include/asm-frv/socket.h b/include/asm-frv/socket.h
index 31db18fc871f..a823befd11dd 100644
--- a/include/asm-frv/socket.h
+++ b/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 */
 
diff --git a/include/asm-h8300/socket.h b/include/asm-h8300/socket.h
index ebc830fee0d0..39911d8c9684 100644
--- a/include/asm-h8300/socket.h
+++ b/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 */
diff --git a/include/asm-i386/socket.h b/include/asm-i386/socket.h
index 5755d57c4e95..99ca648b94c5 100644
--- a/include/asm-i386/socket.h
+++ b/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 */
diff --git a/include/asm-ia64/socket.h b/include/asm-ia64/socket.h
index d638ef3d50c3..9e42ce43cfbe 100644
--- a/include/asm-ia64/socket.h
+++ b/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 */
diff --git a/include/asm-m32r/socket.h b/include/asm-m32r/socket.h
index acdf748fcdc8..793d5d30c850 100644
--- a/include/asm-m32r/socket.h
+++ b/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 */
diff --git a/include/asm-m68k/socket.h b/include/asm-m68k/socket.h
index a5966ec005ae..6d21b90863ad 100644
--- a/include/asm-m68k/socket.h
+++ b/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 */
diff --git a/include/asm-mips/socket.h b/include/asm-mips/socket.h
index 36ebe4e186a7..95945689b1c6 100644
--- a/include/asm-mips/socket.h
+++ b/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__
 
diff --git a/include/asm-parisc/socket.h b/include/asm-parisc/socket.h
index ce2eae1708b5..99e868f6a8f5 100644
--- a/include/asm-parisc/socket.h
+++ b/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
diff --git a/include/asm-powerpc/socket.h b/include/asm-powerpc/socket.h
index c8b1da50e72d..403e9fde2eb5 100644
--- a/include/asm-powerpc/socket.h
+++ b/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 */
diff --git a/include/asm-s390/socket.h b/include/asm-s390/socket.h
index 1778a49a74c5..1161ebe3dec9 100644
--- a/include/asm-s390/socket.h
+++ b/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 */
diff --git a/include/asm-sh/socket.h b/include/asm-sh/socket.h
index ca70362eb563..c48d6fc9da38 100644
--- a/include/asm-sh/socket.h
+++ b/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 */
diff --git a/include/asm-sparc/socket.h b/include/asm-sparc/socket.h
index f6c4e5baf3f7..7c1423997cf0 100644
--- a/include/asm-sparc/socket.h
+++ b/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
diff --git a/include/asm-sparc64/socket.h b/include/asm-sparc64/socket.h
index 754d46a50af3..986441dcb8f0 100644
--- a/include/asm-sparc64/socket.h
+++ b/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
diff --git a/include/asm-v850/socket.h b/include/asm-v850/socket.h
index 0dfe55ac2ef2..a4c2493b025f 100644
--- a/include/asm-v850/socket.h
+++ b/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__ */
diff --git a/include/asm-x86_64/socket.h b/include/asm-x86_64/socket.h
index b46702607933..90af60cf3c0e 100644
--- a/include/asm-x86_64/socket.h
+++ b/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 */
diff --git a/include/asm-xtensa/socket.h b/include/asm-xtensa/socket.h
index 971d231be60e..1f5aeacb9da2 100644
--- a/include/asm-xtensa/socket.h
+++ b/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 */
diff --git a/include/net/sock.h b/include/net/sock.h
index 51246579592e..390c04700590 100644
--- a/include/net/sock.h
+++ b/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;
 }
 
diff --git a/net/compat.c b/net/compat.c
index 0e407563ae85..9a0f5f2b90c8 100644
--- a/net/compat.c
+++ b/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);
diff --git a/net/core/sock.c b/net/core/sock.c
index 792ae39804a2..f9e6991d3729 100644
--- a/net/core/sock.c
+++ b/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:
diff --git a/net/socket.c b/net/socket.c
index cf18c5eb592e..a7bd0df115b2 100644
--- a/net/socket.c
+++ b/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)
 {