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- moves lib_dir to xtables.c
- introduces struct pfinfo which has protocol family dependent infomations.
- unifies load_ip[6]tables_ko() and moves them as load_xtables_ko()
- introduces xt_{match,match_rule,target,tryload} and replaces
ip[6]t_* with them
- unifies following functions and move them to xtables.c
- find_{match,find_target}
- compatible_revision, compatible_{match,target}_revision
- introduces xtables_register_{match,target} and make
register_{match,target}[6] call them. xtables_register_* register ONLY
matches/targets matched protocol family
Some concepts:
- source compatibility for libip[6]t_xxx.c with warning on compilation
not binary compatibility.
- binary compatibility between 2.4/2.6 kernel and iptables/ip6tables,
of cause.
- xtables is enough to support only one address family at runtime.
Then xtables keeps infomations of only the focused address famiy
in struct afinfo.
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