libxtables: Fix unsupported extension warning corner case

Some extensions are not supported in revision 0 by user space anymore,
for those the warning in xtables_compatible_revision() does not print as
no revision 0 is tried.

To fix this, one has to track if none of the user space supported
revisions were accepted by the kernel. Therefore add respective logic to
xtables_find_{target,match}().

Note that this does not lead to duplicated warnings for unsupported
extensions that have a revision 0 because xtables_compatible_revision()
returns true for them to allow for extension's help output.

For the record, these ip6tables extensions are affected: set/SET,
socket, tos/TOS, TPROXY and SNAT. In addition to that, TEE is affected
for both families.

Fixes: 17534cb18ed0a ("Improve error messages for unsupported extensions")
Signed-off-by: Phil Sutter <phil@nwl.cc>

0 files changed, 0 insertions, 0 deletions