route: add route types — blackhole, unreachable, prohibit
RouteTable Rule gains route_type: RouteType field:
- Unicast (default): normal forwarding
- Blackhole: silently drop, no ICMP error
- Unreachable: drop + send ICMP Destination Unreachable
- Prohibit: drop + send ICMP Administratively Prohibited
Route type checked in all forwarding/outbound paths:
- Forward path (IPv4): blackhole/unreachable/prohibit drop + error
- Output path (IPv4): blackhole/unreachable/prohibit drop + error
- Output path (IPv6): blackhole/unreachable/prohibit drop
Usage: Rule::with_type(cidr, via, dev, src, RouteType::Blackhole)
Existing Rule::new() creates Unicast routes (backward compatible).
Display: blackhole/unreachable/prohibit prefixed in route list output.
Mirrors Linux iproute2 'ip route add blackhole 10.0.0.0/8'.
Red Bear OS
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