Bug#816132: systemd-networkd: Tunnel setup for sit-type tunnel fails

[Sven Hartge]

Package: systemd
Version: 229-1
Severity: important
Tags: ipv6

Hi!

I am using systemd-networkd to manage a HE.net IPv6 Tunnel, using
a netdev, and two network files in /etc/systemd/network:

--------[ he-tunnel.netdev ]--------
[Match]
 
[NetDev]
Description=HE.net Tunnelbroker sit device
Name=he-ipv6
Kind=sit
MTUBytes=1480
 
[Tunnel]
Local=130.180.40.117  
Remote=216.66.80.30
TTL=255
-------------------------------------

--------[ he-tunnel.network ]--------
[Match]
Name=he-ipv6
 
[Network]
Address=2001:470:1f0a:cbf::2/64 
Gateway=2001:470:1f0a:cbf::1

IPForward=true
-------------------------------------

--------[ lan.network ]--------
[Match]
MACAddress=02:17:08:81:64:44

[Network]
Address=130.180.40.117/29
Gateway=130.180.40.113

Address=2001:470:7403:f::1/64

Tunnel=he-ipv6

IPForward=true

[Route]
Destination=2001:470:7403::/48
Gateway=2001:470:7403:f::2

[Route]
Destination=192.168.100.0/24
Gateway=130.180.40.114
-------------------------------------

This has worked flawless so far, but after a reboot today, systemd-networkd
does not want to create the tunnel device and logs the following error:

Feb 27 20:18:47 urd systemd-networkd[1654]: [/etc/systemd/network/he-tunnel.netdev:10] Tunnel addresses incompatible, ignoring assignment: 130.180.40.117
Feb 27 20:18:47 urd systemd-networkd[1654]: [/etc/systemd/network/he-tunnel.netdev:11] Tunnel addresses incompatible, ignoring assignment: 216.66.80.30
Feb 27 20:18:47 urd systemd-networkd[1654]: Tunnel with invalid address family configured in /etc/systemd/network/he-tunnel.netdev. Ignoring
Feb 27 20:18:47 urd systemd-networkd[1654]: [/etc/systemd/network/lan.network:10] Tunnel is invalid, ignoring assignment: he-ipv6

This is a severe regression and totally moronic. Why would a sit-Tunnel
(IPv6-in-IPv4) require anything else than an IPv4-Adresse in the local
and remote options of the [Tunnel] section? It this the whole idea of
a 6-in-4-tunnel.

If I manually create the tunnel interface he-ipv6 with

  ip tunnel add he-ipv6 mode sit remote 216.66.80.30 local 130.180.40.117 ttl 255
  ip link set he-ipv6 up mtu 1480

then systemd-networkd uses the information in he-tunnel.network to add the
IPs to the interface but it is not able to create the tunnel interface in
the first place because it wrongly expects an IPv6-Adresse in the local and
remote options.

Grüße,
Sven.

-- Package-specific info:

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'testing'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: armhf (armv7l)

Kernel: Linux 4.4.0-1-armmp-lpae (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser         3.113+nmu3
ii  libacl1         2.2.52-3
ii  libapparmor1    2.10-3
ii  libaudit1       1:2.4.5-1
ii  libblkid1       2.27.1-3
ii  libc6           2.21-9
ii  libcap2         1:2.24-12
ii  libcap2-bin     1:2.24-12
ii  libcryptsetup4  2:1.7.0-2
ii  libgcc1         1:5.3.1-10
ii  libgcrypt20     1.6.5-2
ii  libgpg-error0   1.21-2
ii  libkmod2        22-1
ii  liblzma5        5.1.1alpha+20120614-2.1
ii  libmount1       2.27.1-3
ii  libpam0g        1.1.8-3.2
ii  libseccomp2     2.2.3-3
ii  libselinux1     2.4-3
ii  libsystemd0     229-1
ii  mount           2.27.1-3
ii  util-linux      2.27.1-3

Versions of packages systemd recommends:
ii  dbus            1.10.6-1
pn  libpam-systemd  <none>

Versions of packages systemd suggests:
pn  systemd-container  <none>
pn  systemd-ui         <none>

Versions of packages systemd is related to:
ii  udev  229-1

-- Configuration Files:
/etc/systemd/journald.conf changed [not included]
/etc/systemd/timesyncd.conf changed [not included]

-- no debconf information