[strongSwan] linux 4.3 regression: received netlink error: Invalid argument (22)

[Andreas Hofmeister]

On 11/09/2015 09:39 PM, Harald Dunkel wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
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> Since kernel 4.3 routing seems to be broken. I get some messages
> in /var/log/daemon.log saying
>
> :
> Nov  9 21:24:44 cecil charon: 13[IKE] installing new virtual IP 172.19.97.237
> Nov  9 21:24:44 cecil charon: 13[KNL] received netlink error: Invalid argument (22)

We got similar errors when adding routes on a device with preferred 
source address (in a different context though). Stuff like

   ip route add to 172.16.0.0/16 dev eth0 src 172.16.0.2 table 123

does not seem to work anymore, which I guess is the equivalent to what 
charon does here.

A git bisect on the Kernel source came up with that commit:

---8<---
commit 021dd3b8a142d482cb65a27bf6644e3764001460
Author: David Ahern <dsa at cumulusnetworks.com>
Date:   Thu Aug 13 14:59:06 2015 -0600

     net: Add routes to the table associated with the device
--->8---

We did not come around to track down what exactly in that commit did 
break our use case, let alone what reverting that would mean.

Ciao
   Andi