Public bug reported:
The following example should configure a GRE tunnel between 172.16.4.2
and 172.16.1.2, with key 33490175. The effect should be like manually
configured with: sudo ip tunnel add test1 mode gre local 172.16.4.2
remote 172.16.1.2 key 33490175.
However, the following Netplan configuration fails under Ubuntu 22.04
(latest development version, March 25, 2022):
network:
version: 2
renderer: networkd
tunnels:
gre1-255-255:
mode: gre
ttl: 255
local: 172.16.4.2
remote: 172.16.1.2
key: 33490175
addresses:
- 172.20.82.94/30
Result of "sudo netplan generate": Error in network definition:
gre1-255-255: 'input-key' is not required for this tunnel type
Note: There should be no input and output keys. There is just one single
key!
Trying to change the configuration:
keys:
input: 33490175
# key: 33490175
Result of "sudo netplan generate": Error in network definition:
gre1-255-255: 'input-key' is not required for this tunnel type
Some investigation into the sources of Netplan (src/validation.c ->
https://github.com/canonical/netplan/blob/main/src/validation.c):
static gboolean
validate_tunnel_backend_rules(NetplanNetDefinition* nd, yaml_node_t* node,
GError** error)
{
/* Backend-specific validation rules for tunnels */
switch (nd->backend) {
case NETPLAN_BACKEND_NETWORKD:
switch (nd->tunnel.mode) {
case NETPLAN_TUNNEL_MODE_VTI:
case NETPLAN_TUNNEL_MODE_VTI6:
case NETPLAN_TUNNEL_MODE_WIREGUARD:
break;
/* TODO: Remove this exception and fix ISATAP handling with the
* networkd backend.
* systemd-networkd has grown ISATAP support in 918049a.
*/
case NETPLAN_TUNNEL_MODE_ISATAP:
return yaml_error(node, error,
"%s: %s tunnel mode is not supported by
networkd",
nd->id,
g_ascii_strup(tunnel_mode_to_string(nd->tunnel.mode), -1));
break;
default:
if (nd->tunnel.input_key)
return yaml_error(node, error, "%s: 'input-key' is not
required for this tunnel type", nd->id);
if (nd->tunnel.output_key)
return yaml_error(node, error, "%s: 'output-key' is not
required for this tunnel type", nd->id);
break;
}
break;
It seems that the cases NETPLAN_TUNNEL_MODE_GRE and
NETPLAN_TUNNEL_MODE_IP6GRE are missing for systemd-networkd. According
to https://github.com/systemd/systemd/issues/12144, systemd-networkd
should support configuration with keys since ca. 2 years.
** Affects: netplan
Importance: Undecided
Status: New
** Affects: systemd
Importance: Unknown
Status: Unknown
** Affects: ubuntu
Importance: Undecided
Status: New
** Bug watch added: github.com/systemd/systemd/issues #12144
https://github.com/systemd/systemd/issues/12144
** Also affects: systemd via
https://github.com/systemd/systemd/issues/12144
Importance: Unknown
Status: Unknown
** Also affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1966476
Title:
Netplan does not provide "key" parameter to GRE tunnel configuration
via systemd-networkd
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