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libnm: avoid serializing "ipv6.addr-gen-mode" default to D-Bus
When serializing setting properties to GVariant/D-Bus, we usually
omit values that are set to the default. That is done by libnm(-core),
so it happens both on the daemon and client side. That might be
useful to avoid a large number of properties on D-Bus.
Before changing the default value for "ipv6.addr-gen-mode" ([1]), we
would not serialize the previous default value ("stable-privacy").
Now we would serialize the new default value ("default). This change
causes problems.
Scenario 1: have a profile in the daemon with "ipv6.addr-gen-mode=stable-privacy",
have an older daemon version before [1] and a newer client after [1]. Result:
The daemon exposes the profile on D-Bus without the addr-gen-mode
field (because it's the default). To the client, that is interpreted
differently, as "ipv6.addr-gen-mode=default". This is already somewhat
a problem.
More severe is when modifying the profile, the client would now serialize
the value "default" on D-Bus, which the older daemon rejects as invalid.
That means, you could not modify the profile, unless also resetting
addr-gen-mode to "stable-privacy" or "eui64".
You can imagine other scenarios where either the daemon or the client is
before/after change [1] and the addr-gen-mode is set to either "default"
or "stable-privacy". Depending on what scenario you look, that can either be
good or bad.
Scenario 1 is pretty bad, because it means `dnf upgrade NetworkManager
&& nmcli connection modify ...` will fail (if the daemon was not
restated). So try to fix Scenario 1, by also not serializing the new
default value on D-Bus. Of course, some of the scenarios will get
different problems, by exacerbating one side misunderstanding the actually
set value and interpreting a missing value on D-Bus wrongly. But those
problems are likely less severe.
In case both client and daemon are older/newer than [1], it doesn't
matter either way. The problem happens with different version and is
caused by a change of the default value.
[1] e6a33c04eb
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1372
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@ -836,8 +836,7 @@ nm_setting_ip6_config_class_init(NMSettingIP6ConfigClass *klass)
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NM_SETTING_IP6_CONFIG_ADDR_GEN_MODE_DEFAULT,
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NM_SETTING_PARAM_NONE,
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NMSettingIP6ConfigPrivate,
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addr_gen_mode,
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.to_dbus_including_default = TRUE);
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addr_gen_mode);
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/**
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* NMSettingIP6Config:token:
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