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cb9d854207
MultiPathRoute= can now specify device-only nexthops without a gateway address, e.g. MultiPathRoute=@wg0. This enables ECMP configurations over interfaces that don't use gateway addresses, such as WireGuard tunnels. The syntax is extended from "address[@device] [weight]" to "[address]@device [weight]". The address is now optional, but at least one of gateway or device must be specified. The @ symbol must still be present for device-only routes, making the syntax unambiguous: @wg0 specifies a device, while a bare IP address specifies a gateway. Device-only nexthops are only available for IPv4 routes. Device-only multipath routes for IPv6 are not supported by the kernel's netlink interface and will be rejected with a warning. This change is fully backwards compatible. All existing configurations continue to work unchanged, as they always included a gateway address. Closes #39699.