Fix for multicast entries ipv6 routes on Linux

[mkosmach]

What does this PR do?

Add processing for multicast entries in ip -6 route show table all output

What issues does this PR fix or reference?

Patrial fix (only for multicast entries for now) for #58377

Previous Behavior

backtrace whan network.routes used on LInux without netstat

New Behavior

correct ipv6 route entry in network.routes

Commits signed with GPG?

No

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[Ch3LL]

This will require test coverage and a changelog file

[votdev]

LGFM

Here is the output of my test:

root@omv6box:/home/vagrant# ip -6 route show table all
::1 dev lo proto kernel metric 256 pref medium
fe80::/64 dev ens6 proto kernel metric 256 pref medium
fe80::/64 dev ens8 proto kernel metric 256 pref medium
local ::1 dev lo table local proto kernel metric 0 pref medium
local fe80::5054:ff:fe27:25a6 dev ens8 table local proto kernel metric 0 pref medium
local fe80::5054:ff:fe58:56f dev ens6 table local proto kernel metric 0 pref medium
multicast ff00::/8 dev ens6 table local proto kernel metric 256 pref medium
multicast ff00::/8 dev ens8 table local proto kernel metric 256 pref medium
root@omv6box:/home/vagrant#
root@omv6box:/home/vagrant#
root@omv6box:/home/vagrant# salt-call --local --retcode-passthrough --no-color --out=json network.routes inet6
{
    "local": [
        {
            "addr_family": "inet6",
            "destination": "::1",
            "gateway": "::",
            "netmask": "",
            "flags": "U",
            "interface": "lo"
        },
        {
            "addr_family": "inet6",
            "destination": "fe80::/64",
            "gateway": "::",
            "netmask": "",
            "flags": "U",
            "interface": "ens6"
        },
        {
            "addr_family": "inet6",
            "destination": "fe80::/64",
            "gateway": "::",
            "netmask": "",
            "flags": "U",
            "interface": "ens8"
        },
        {
            "addr_family": "inet6",
            "destination": "::1/128",
            "gateway": "::",
            "netmask": "",
            "flags": "U",
            "interface": "lo"
        },
        {
            "addr_family": "inet6",
            "destination": "fe80::5054:ff:fe27:25a6/128",
            "gateway": "::",
            "netmask": "",
            "flags": "U",
            "interface": "ens8"
        },
        {
            "addr_family": "inet6",
            "destination": "fe80::5054:ff:fe58:56f/128",
            "gateway": "::",
            "netmask": "",
            "flags": "U",
            "interface": "ens6"
        },
        {
            "addr_family": "inet6",
            "destination": "ff00::/8",
            "gateway": "table",
            "netmask": "",
            "flags": "U",
            "interface": "ens6"
        },
        {
            "addr_family": "inet6",
            "destination": "ff00::/8",
            "gateway": "table",
            "netmask": "",
            "flags": "U",
            "interface": "ens8"
        }
    ]
}

[Ch3LL]

We will need a test added to our test suite, to ensure this does not regress in the future. Here is some documentation on our test suite and how to get started: https://docs.saltproject.io/en/latest/topics/tutorials/writing_tests.html

And here is documentation on how to add a changelog file: https://docs.saltproject.io/en/latest/topics/development/changelog.html

[votdev]

The issue has been resolved for 3004, see https://github.com/saltstack/salt/blob/v3004/salt/modules/network.py#L574.

[Ch3LL]

@mkosmach you okay closing this based on @votdev 's feedback?

[dwoz]

Closing this due to inactivity. Anyone should feel free to re-open it if they want to see it through to the end in one release cycle.