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, 12 insertions, 7 deletions

diff --git a/net/compat.c b/net/compat.c
index a3a2ba0fac08..8d739053afe4 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -216,7 +216,7 @@ 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_timespec cts[3];
         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
         struct compat_cmsghdr cmhdr;
         int cmlen;
@@ -233,12 +233,17 @@ int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *dat
                 data = &ctv;
                 len = sizeof(ctv);
         }
-        if (level == SOL_SOCKET && type == SCM_TIMESTAMPNS) {
+        if (level == SOL_SOCKET &&
+            (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
+                int count = type == SCM_TIMESTAMPNS ? 1 : 3;
+                int i;
                 struct timespec *ts = (struct timespec *)data;
-                cts.tv_sec = ts->tv_sec;
-                cts.tv_nsec = ts->tv_nsec;
+                for (i = 0; i < count; i++) {
+                        cts[i].tv_sec = ts[i].tv_sec;
+                        cts[i].tv_nsec = ts[i].tv_nsec;
+                }
                 data = &cts;
-                len = sizeof(cts);
+                len = sizeof(cts[0]) * count;
         }
 
         cmlen = CMSG_COMPAT_LEN(len);
@@ -455,7 +460,7 @@ int compat_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 err;
@@ -479,7 +484,7 @@ int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *usersta
         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 err;