Is it possible to execute net_enable_timestamp() from user space in linux?

I'd like to enable timestamping received network packets. I found that function net_enable_timestamp() should do this form me, but I can't find it neither in CentOS nor in ArchLinux. But when I execute:

# cat /proc/kallsyms | grep net_enable_timestam开发者_开发百科p
c126a330 T net_enable_timestamp

In kernel source from kernel.org it's located in linux/netdevice.h, but not in both distros mentioned above. Is it possible to execute it? How?

What's wrong with enabling SO_TIMESTAMP on the socket and accessing the timestamp of the last message via ancilliary data?

Alternatively you can call ioctl(socket, SIOCGSTAMP) as described in socket(7)

Edit: Looking at the kernel source code, it appears that net_enable_timestamp() actually gets called indirectly when you do setsockopt(sock, SO_TIMESTAMP ...

So my answer answers your question :)