Changes with 248

• systemd-networkd gained support for the "B.A.T.M.A.N. advanced" wireless routing protocol that operates on ISO/OSI Layer 2 only and uses ethernet frames to route/bridge packets. This encompasses a new batadv netdev Type=, a new [BatmanAdvanced] section with a bunch of new settings in .netdev files, and a new BatmanAdvanced= setting in .network files.

• systemd.network files gained a [Network] RouteTable= configuration switch to select the routing policy table.

  systemd.network files gained a [RoutingPolicyRule] Type= configuration switch (one of blackhole, unreachable, prohibit).

  systemd.network files gained a [IPv6AcceptRA] RouteDenyList= and RouteAllowList= settings to ignore/accept route advertisements from routers matching specified prefixes. The DenyList= setting has been renamed to PrefixDenyList= and a new PrefixAllowList= option has been added.

  systemd.network files gained a [DHCPv6] UseAddress= setting to optionally ignore the address provided in the lease.

  systemd.network files gained a [DHCPv6PrefixDelegation] ManageTemporaryAddress= switch.

  systemd.network files gained a new ActivationPolicy= setting which allows configuring how the UP state of an interface shall be managed, i.e. whether the interface is always upped, always downed, or may be upped/downed by the user using ip link set dev.

• The default for the Broadcast= setting in .network files has slightly changed: the broadcast address will not be configured for wireguard devices.

• systemd.netdev files gained a [VLAN] Protocol=, IngressQOSMaps=, EgressQOSMaps=, and [MACVLAN] BroadcastMulticastQueueLength= configuration options for VLAN packet handling.

• systemd-timesyncd gained a new ConnectionRetrySec= setting which configures the retry delay when trying to contact servers.

• networkctl now shows the link activation policy in status.