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authorEric Dumazet <dada1@cosmosbay.com>2007-03-25 22:14:49 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:24:21 -0700
commit92f37fd2ee805aa77925c1e64fd56088b46094fc (patch)
tree8251c38b83ab362116dac89d94412ce229b42831 /net
parentc7a3c5da35055e2fa97ed4f0da3eec4bd0ef4c38 (diff)
downloadlinux-92f37fd2ee805aa77925c1e64fd56088b46094fc.tar.bz2
[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>
Diffstat (limited to 'net')
-rw-r--r--net/compat.c10
-rw-r--r--net/core/sock.c16
-rw-r--r--net/socket.c29
3 files changed, 52 insertions, 3 deletions
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)
{