Red Hat Bugzilla – Bug 244047
[RHEL5]: ip6tables failing on ipv6headers module
Last modified: 2010-10-22 11:38:11 EDT
Description of problem:
This is the RHEL-5 version of the same problem listed in BZ 165145: namely, when
you do the following:
# ip6tables -A INPUT -m ipv6header --header route -j DROP
Couldn't load match `ipv6header':/lib/iptables/libip6t_ipv6header.so: cannot
open shared object file: No such file or directory
I tracked this down into the iptables package proper. If you look in
iptables/extensions/Makefile, there is a test near the beginning called
"PF6_EXT_SLIB_OPTS". What it does is run through all of the .*-test6 files,
running each of them, and adding them to the "PF6_EXT_SLIB_OPTS" list if they
print out their own name. In the case of .ipv6header-test6, it looks to see if
both the ip6t_ipv6header.h *and* ip6t_ipv6header.c files are present in
/usr/include/linux, which is obviously not the case, so the match fails. So the
kernel has ipv6header built-in, but the test is failing so the requisite
ipv6tables .so is not being built.
The second part of the problem is that the part that builds the man pages
completely ignores what was found, and just builds the man page for *all*
possible modules, regardless of they were built or not.
So my recommendation here is:
1) Fix upstream so that only the parts of iptables/ip6tables that are built are
included in the man page. This should be a fairly simple Makefile fix.
2) Fix the tests in the extensions/ directory to only look for the header file.
Besides the ipv6header module, there are/may be some other modules that are not
being built into the iptables package despite having proper kernel support built in.
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
*** Bug 339511 has been marked as a duplicate of this bug. ***
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.