tree a01c464cb5ff29e77e546881b69f8f541bf22861
parent 0d3c703a9d1723c7707e0680019ac8ff5922db42
author Tom Herbert <tom@herbertland.com> 1461975136 -0700
committer David S. Miller <davem@davemloft.net> 1462231411 -0400

gre: Move utility functions to common headers

Several of the GRE functions defined in net/ipv4/ip_gre.c are usable
for IPv6 GRE implementation (that is they are protocol agnostic).

These include:
  - GRE flag handling functions are move to gre.h
  - GRE build_header is moved to gre.h and renamed gre_build_header
  - parse_gre_header is moved to gre_demux.c and renamed gre_parse_header
  - iptunnel_pull_header is taken out of gre_parse_header. This is now
    done by caller. The header length is returned from gre_parse_header
    in an int* argument.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>