Andre Oppermann 1dfcf0d2a3 Move the IPSEC related code blocks to their own file to unclutter
and signifincantly improve the readability of ip_input() and
ip_output() again.

The resulting IPSEC hooks in ip_input() and ip_output() may be
used later on for making IPSEC loadable.

This move is mostly mechanical and should preserve current IPSEC
behaviour as-is.  Nothing shall prevent improvements in the way
IPSEC interacts with the IPv4 stack.

Discussed with:	bz, gnn, rwatson; (earlier version)
2006-02-01 13:55:03 +00:00
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