netlink-packet-route 0.32.0

netlink packet types
Documentation 
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// SPDX-License-Identifier: MIT

use std::net::Ipv4Addr;

use netlink_packet_core::{Emitable, Parseable};

use crate::{
    route::{
        flags::RouteFlags, RouteAttribute, RouteHeader, RouteMessage,
        RouteMessageBuffer, RouteNextHop, RouteNextHopFlags, RouteProtocol,
        RouteScope, RouteType,
    },
    AddressFamily,
};

// wireshark capture(netlink message header removed) of nlmon against command:
//   ip route add 10.109.0.0/16 nexthop via 10.0.0.254 dev test-dummy weight 1
//       nexthop via 10.0.0.253 dev test-dummy weight 2
#[test]
fn test_route_multipath_two_nexthops() {
    let raw = vec![
        // rtmsg: family=AF_INET(2), dst_len=16, src_len=0, tos=0,
        //        table=main(254), proto=boot(3), scope=global(0),
        //        type=unicast(1), flags=0
        0x02, 0x10, 0x00, 0x00, 0xfe, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
        // RTA_TABLE(0x0f)=254
        0x08, 0x00, 0x0f, 0x00, 0xfe, 0x00, 0x00, 0x00,
        // RTA_DST(0x01)=10.109.0.0
        0x08, 0x00, 0x01, 0x00, 0x0a, 0x6d, 0x00, 0x00,
        // RTA_MULTIPATH(0x09) with 2 nexthops:
        //   nexthop 0: len=16, flags=0, hops=0(weight=1), ifindex=17
        //              RTA_GATEWAY=10.0.0.254
        //   nexthop 1: len=16, flags=0, hops=1(weight=2), ifindex=17
        //              RTA_GATEWAY=10.0.0.253
        0x24, 0x00, 0x09, 0x00, 0x10, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00,
        0x08, 0x00, 0x05, 0x00, 0x0a, 0x00, 0x00, 0xfe, 0x10, 0x00, 0x00, 0x01,
        0x11, 0x00, 0x00, 0x00, 0x08, 0x00, 0x05, 0x00, 0x0a, 0x00, 0x00, 0xfd,
    ];

    let expected = RouteMessage {
        header: RouteHeader {
            address_family: AddressFamily::Inet,
            destination_prefix_length: 16,
            source_prefix_length: 0,
            tos: 0,
            table: 254,
            protocol: RouteProtocol::Boot,
            scope: RouteScope::Universe,
            kind: RouteType::Unicast,
            flags: RouteFlags::empty(),
        },
        attributes: vec![
            RouteAttribute::Table(254),
            RouteAttribute::Destination(Ipv4Addr::new(10, 109, 0, 0).into()),
            RouteAttribute::MultiPath(vec![
                RouteNextHop {
                    flags: RouteNextHopFlags::empty(),
                    hops: 0,
                    interface_index: 17,
                    attributes: vec![RouteAttribute::Gateway(
                        Ipv4Addr::new(10, 0, 0, 254).into(),
                    )],
                },
                RouteNextHop {
                    flags: RouteNextHopFlags::empty(),
                    hops: 1,
                    interface_index: 17,
                    attributes: vec![RouteAttribute::Gateway(
                        Ipv4Addr::new(10, 0, 0, 253).into(),
                    )],
                },
            ]),
        ],
    };

    assert_eq!(
        expected,
        RouteMessage::parse(&RouteMessageBuffer::new(&raw)).unwrap()
    );

    let mut buf = vec![0; expected.buffer_len()];
    expected.emit(&mut buf);
    assert_eq!(buf, raw);
}