add test for link with IFLA_VRF_PORT_TABLE attribute

Note that I had to derive `Default` on a couple structs to make the
test manageable.

Also, I noticed that the packet we emit does not 100% matches the
packet emitted by the kernel.

src/link/af_spec/inet.rs

@@ -123,7 +123,7 @@ buffer!(InetDevConfBuffer(DEV_CONF_LEN) {
     arp_evict_nocarrier: (i32, 128..132),
 });
 
-#[derive(Clone, Copy, Eq, PartialEq, Debug)]
+#[derive(Clone, Copy, Eq, PartialEq, Debug, Default)]
 #[non_exhaustive]
 pub struct InetDevConf {
     pub forwarding: i32,

src/link/af_spec/inet6_devconf.rs

@@ -216,7 +216,7 @@ impl Emitable for Inet6DevConf {
     }
 }
 
-#[derive(Clone, Copy, Eq, PartialEq, Debug)]
+#[derive(Clone, Copy, Eq, PartialEq, Debug, Default)]
 #[non_exhaustive]
 pub struct Inet6DevConf {
     pub forwarding: i32,

src/link/af_spec/inet6_icmp.rs

@@ -7,7 +7,7 @@ use netlink_packet_utils::{
 
 pub(crate) const ICMP6_STATS_LEN: usize = 48;
 
-#[derive(Clone, Copy, Eq, PartialEq, Debug)]
+#[derive(Clone, Copy, Eq, PartialEq, Debug, Default)]
 #[non_exhaustive]
 pub struct Icmp6Stats {
     pub num: i64,

src/link/af_spec/inet6_stats.rs

@@ -46,7 +46,7 @@ buffer!(Inet6StatsBuffer(INET6_STATS_LEN) {
     in_ce_pkts: (i64, 280..288),
 });
 
-#[derive(Clone, Copy, Eq, PartialEq, Debug)]
+#[derive(Clone, Copy, Eq, PartialEq, Debug, Default)]
 #[non_exhaustive]
 pub struct Inet6Stats {
     pub num: i64,

src/link/link_info/mod.rs

@@ -42,7 +42,7 @@ pub use self::gre_tap6::InfoGreTap6;
 pub use self::gtp::InfoGtp;
 pub use self::hsr::{HsrProtocol, InfoHsr};
 pub use self::info_data::InfoData;
-pub use self::info_port::{InfoPortData, InfoPortKind};
+pub use self::info_port::{InfoPortData, InfoPortKind, InfoVrfPort};
 pub use self::infos::{InfoKind, LinkInfo};
 pub use self::ipoib::InfoIpoib;
 pub use self::ipvlan::{InfoIpVlan, InfoIpVtap, IpVlanMode, IpVtapMode};

src/link/map.rs

@@ -16,7 +16,7 @@ buffer!(MapBuffer(LINK_MAP_LEN) {
     port: (u8, 27),
 });
 
-#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Default)]
 #[non_exhaustive]
 pub struct Map {
     pub memory_start: u64,

src/link/mod.rs

@@ -44,9 +44,9 @@ pub use self::link_info::{
     InfoGreTap, InfoGreTap6, InfoGreTun, InfoGreTun6, InfoGtp, InfoHsr,
     InfoIpVlan, InfoIpVtap, InfoIpoib, InfoKind, InfoMacSec, InfoMacVlan,
     InfoMacVtap, InfoPortData, InfoPortKind, InfoSitTun, InfoTun, InfoVeth,
-    InfoVlan, InfoVrf, InfoVti, InfoVxlan, InfoXfrm, IpVlanMode, IpVtapMode,
-    LinkInfo, LinkXstats, MacSecCipherId, MacSecOffload, MacSecValidate,
-    MacVlanMode, MacVtapMode, MiiStatus, VlanQosMapping,
+    InfoVlan, InfoVrf, InfoVrfPort, InfoVti, InfoVxlan, InfoXfrm, IpVlanMode,
+    IpVtapMode, LinkInfo, LinkXstats, MacSecCipherId, MacSecOffload,
+    MacSecValidate, MacVlanMode, MacVtapMode, MiiStatus, VlanQosMapping,
 };
 pub use self::link_layer_type::LinkLayerType;
 pub use self::link_state::State;

src/link/stats.rs

@@ -7,7 +7,7 @@ use netlink_packet_utils::{
 
 pub(crate) const LINK_STATS_LEN: usize = 96;
 
-#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Default)]
 #[non_exhaustive]
 pub struct Stats {
     /// total packets received

src/link/stats64.rs

@@ -35,7 +35,7 @@ buffer!(Stats64Buffer(LINK_STATS64_LEN) {
     rx_otherhost_dropped: (u64, 192..200),
 });
 
-#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Default)]
 #[non_exhaustive]
 pub struct Stats64 {
     /// total packets received