Hi,
here the last message of redhat:
The issue has been fixed upstream:
-commit 7c8f4e6dc30996bff806285730a0bb4e714d3d52
Author: Jason A. Donenfeld <Jason@zx2c4.com>
Date: Tue Jun 26 01:39:32 2018 +0200
fib_rules: match rules based on suppress_* properties too
Two rules with different values of suppress_prefix or suppress_ifgroup
are not the same. This fixes an -EEXIST when running:
$ ip -4 rule add table main suppress_prefixlength 0
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Fixes: f9d4b0c1e969 ("fib_rules: move common handling of newrule delrule
msgs
into fib_nl2rule")
problem should be considered as fixed.
Regards,
Silvan
-------- Forwarded Message --------
Hi,
since i had to debug this problem already i can tell you it is not
iproute2 causing the problem.
The main problem is that the current standard kernel of CentOS simple
does not support the handling of "suppress_prefixlength".
Iproute2 supports it since it does not return any error while adding so
it had to be the kernel causing problems.
In essence Red Hats official answer was "It isn't a bug, RHEL7 simple
does not support it".
If you sill want to fix your problem just upgrade your kernel to
long-term or mainline.
Regards,
Silvan
On 06/28/2018 04:47 AM, Eddie wrote:
> Hi,
>
> I just updated both a RHEL and a CentOS system from 7 -> 7.5.
> Following this, when running wg-quick, the routing tables are not
> updated correctly. Both systems are running
> iproute.x86_64-4.11.0-14.el7, but from different repositories and are
> definitely different builds as they install to different sbin libraries.
>
> Here's what I'm seeing:
>
> [eddieath@oc8361880017 ~]$ sudo ip rule list
> 0: from all lookup local
> 32766: from all lookup main
> 32767: from all lookup default
> [eddieath@oc8361880017 ~]$
> [eddieath@oc8361880017 ~]$ sudo wg-quick up wg0
> [#] ip link add wg0 type wireguard
> [#] wg setconf wg0 /dev/fd/63
> [#] ip address add 192.168.0.11/24 dev wg0
> [#] ip link set mtu 1420 dev wg0
> [#] ip link set wg0 up
> [#] ip -4 route add 0.0.0.0/0 dev wg0 table 51820
> [#] ip -4 rule add not fwmark 51820 table 51820
> [#] ip -4 rule add table main suppress_prefixlength 0
> [eddieath@oc8361880017 ~]$
> [eddieath@oc8361880017 ~]$ sudo ip rule list
> 0: from all lookup local
> 32764: from all lookup main
> 32765: not from all fwmark 0xca6c lookup 51820
> 32766: from all lookup main
> 32767: from all lookup default
> [eddieath@oc8361880017 ~]$
>
> Note the "suppress_prefixlength 0" has been dropped, which really
> breaks the routing with a "normal" main ahead of table 51820.
> Following this, when running the "down", the duplicated table is not
> removed, as there is no match searching for "suppress_prefixlength 0":
>
> [eddieath@oc8361880017 ~]$ sudo wg-quick down wg0
> [#] wg showconf wg0
> sync: ignoring all arguments
> [#] ip -4 rule delete table 51820
> [#] ip link delete dev wg0
> [eddieath@oc8361880017 ~]$ sudo ip rule list
> 0: from all lookup local
> 32764: from all lookup main
> 32766: from all lookup main
> 32767: from all lookup default
> [eddieath@oc8361880017 ~]$
>
> I've confirmed this on both systems and also that the behaviour is
> purely within ip, and not anything that wg-quick is doing:
>
> [eddieath@oc8361880017 ~]$ sudo ip rule list
> 0: from all lookup local
> 32766: from all lookup main
> 32767: from all lookup default
> [eddieath@oc8361880017 ~]$ sudo ip -4 rule add table main
> suppress_prefixlength 0
> [eddieath@oc8361880017 ~]$ sudo ip rule list
> 0: from all lookup local
> 32765: from all lookup main
> 32766: from all lookup main
> 32767: from all lookup default
> [eddieath@oc8361880017 ~]$
>
> Cheers.
>
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