tree 48a2b84c4298194cd51a55b89b7c9cb2714c0840
parent 3f1e6d3fd37bd4f25e5b19f1c7ca21850426c33f
author Florian Westphal <fw@strlen.de> 1324056915 +0100
committer Pablo Neira Ayuso <pablo@netfilter.org> 1324648219 +0100

netfilter: xt_connbytes: handle negation correctly

"! --connbytes 23:42" should match if the packet/byte count is not in range.

As there is no explict "invert match" toggle in the match structure,
userspace swaps the from and to arguments
(i.e., as if "--connbytes 42:23" were given).

However, "what <= 23 && what >= 42" will always be false.

Change things so we use "||" in case "from" is larger than "to".

This change may look like it breaks backwards compatibility when "to" is 0.
However, older iptables binaries will refuse "connbytes 42:0",
and current releases treat it to mean "! --connbytes 0:42",
so we should be fine.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>