xtables: Register all match/target revisions supported by us and kernel

Keep the order of matches by appending them; keep order between
revisions of same match from most to least recent. All of this
keeps xtables_find_match() happy to find most recent supported
by kernel revision in the given order.

Apply the same for targets, except prepend targets; order between
revisions preserved too.

All this needed to fix nasty bug related to iptables package update
and broken print/save output.

After this change all supported revisions of match/target stored
in corresponding list with following pattern:

         xt_matches                 xt_targets
         ==========                 ==========

     m1  m2  m3     mN             tN     t1  t2  t3
  +-----+--+---+---~~~---+    +---~~~---+---+----+--+
  |43210|10|210|revisions|    |revisions|210|3210|10|
  +-----+--+---+---~~~---+    +---~~~---+---+----+--+

Where new [m]atches added to the list tail and new [t]argets added
to the list head to preserve previous behaviour. Multiple revisions
of single match/target type are grouped together and sorted in
descending order. Both this ensures xtables_find_match() and
xtables_find_target() behaviour remains the same after change: find
highest supported match/target revision given by it's name.

Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>

0 files changed, 0 insertions, 0 deletions