Re: IPv6 in network-manager-openvpn

[Tore Anderson <tore fud no>]

* Nicolas Iooss

> A few weeks ago I ran into a bug in NetworkManager: even though OpenVPN
> now supports IPv6 in tunnels, the OpenVPN plugin of NetworkManager
> doesn't support it. I found bug 682620
> (https://bugzilla.gnome.org/show_bug.cgi?id=682620) and I've implemented
> some of the missing features with the help
> of network-manager-openconnect commits (basically the IPv6 payload part,
> not the IPv6 endpoint one). My patches are attached to this email. Can
> someone review them and tell me what may be wrong with them? As I'm new
> with NetworkManager, I think there must be some mistakes in my code.

Hello Nicolas,

I (and pretty much all of my colleagues) have been happily using your
patches since they were posted with no issues. It's a shame they haven't
been included upstream a long time ago. However, it appears that a 
change in the version of NetworkManager or NetworkManager-openvpn
included in Fedora 20 have broken them. When I connect to a VPN server
that pushes IPv6 routing information, NetworkManager crashes completely.
The crash happens even if I've set the IPv6 method on the VPN connection
to "ignore". Also, the tunnel itself may go over IPv4, the crash still
happens.

<info> VPN connection 'foo' (IP6 Config Get) reply received.
<info> VPN Gateway: 192.0.2.1
<info> Tunnel Device: tun0
<info> IPv4 configuration:
<info>   Internal Gateway: 100.66.2.5
<info>   Internal Address: 100.66.2.6
<info>   Internal Prefix: 32
<info>   Internal Point-to-Point Address: 100.66.2.5
<info>   Maximum Segment Size (MSS): 0
<info>   Static Route: 10.0.0.0/8   Next Hop: 100.66.2.5
<info>   Static Route: [..SNIP..]
<info>   Forbid Default Route: yes
<info>   Internal DNS: 10.0.0.10
<info>   DNS Domain: 'foobar.no'
<info> IPv6 configuration:
<info>   Internal Address: 2001:db8::1000
<info>   Internal Prefix: 112
<info>   Internal Point-to-Point Address: 2001:db8::1
<info>   Maximum Segment Size (MSS): 0
<info>   Static Route: 2001:db8::/32   Next Hop: 2001:db8::1
<info>   Static Route: [..SNIP..]
<info>   Forbid Default Route: yes
<info>   DNS Domain: 'foobar.no'
<info> (tun0): link connected
**
ERROR:platform/nm-linux-platform.c:2212:build_rtnl_addr: assertion failed: (!nle)

Hope this can be fixed and updated patches posted...

I can generate an ABRT dump if anyone would find that useful.

Best regards,
Tore Anderson