systemd-networkd: Support DHCPv{4,6} snooping, IPv{4,6} source address filtering, and ARP and NDP spoofing prevention on bridges

[DemiMarie]

Component

systemd-networkd

Is your feature request related to a problem? Please describe

Many enterprise switches and the Hyper-V virtual switch support DHCPv{4,6} snooping, IPv{4,6} source address filtering, and ARP and NDP spoofing prevention. However, I am not aware of a popular open source implementation.

Describe the solution you'd like

Implement DHCPv{4,6} snooping, IPv{4,6} source address filtering, and ARP and NDP spoofing prevention in systemd-networkd.

Describe alternatives you've considered

None.

The systemd version you checked that didn't have the feature you are asking for

No response