gre: Move utility functions to common headers

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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>

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This commit is contained in:

Tom Herbert 2016-04-29 17:12:16 -07:00 • committed by David S. Miller

parent 0d3c703a9d

commit 95f5c64c3c

3 changed files with 144 additions and 129 deletions

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60

include/net/gre.h

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64

net/ipv4/gre_demux.c

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149

net/ipv4/ip_gre.c

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