Add vrf parameter for routed-nic devices

doc/reference/devices_nic.md

@@ -432,7 +432,7 @@ Key                     | Type    | Default           | Description
 `ipv4.address`          | string  | -                 | Comma-delimited list of IPv4 static addresses to add to the instance
 `ipv4.gateway`          | string  | `auto`            | Whether to add an automatic default IPv4 gateway (can be `auto` or `none`)
 `ipv4.host_address`     | string  | `169.254.0.1`     | The IPv4 address to add to the host-side `veth` interface
-`ipv4.host_table`       | integer | -                 | The custom policy routing table ID to add IPv4 static routes to (in addition to the main routing table)
+`ipv4.host_table`       | integer | -                 | The custom policy routing table ID to add IPv4 static routes to (in addition to the main/vrf routing table)
 `ipv4.neighbor_probe`   | bool    | `true`            | Whether to probe the parent network for IP address availability
 `ipv4.routes`           | string  | -                 | Comma-delimited list of IPv4 static routes to add on host to NIC (without L2 ARP/NDP proxy)
 `ipv6.address`          | string  | -                 | Comma-delimited list of IPv6 static addresses to add to the instance
@@ -450,6 +450,7 @@ Key                     | Type    | Default           | Description
 `parent`                | string  | -                 | The name of the host device to join the instance to
 `queue.tx.length`       | integer | -                 | The transmit queue length for the NIC
 `vlan`                  | integer | -                 | The VLAN ID to attach to
+`vrf`                   | string  | -                 | The VRF on the host in which the host-side interface and routes are created
 
 ## `bridged`, `macvlan` or `ipvlan` for connection to physical network
 

internal/server/device/device_utils_network.go

@@ -222,6 +222,7 @@ func networkCreateVethPair(hostName string, m deviceConfig.Device) (string, uint
 		Peer: ip.Link{
 			Name: network.RandomDevName("veth"),
 		},
+		Master: m["vrf"],
 	}
 
 	// Set the MTU on both ends.
@@ -308,6 +309,7 @@ func networkCreateTap(hostName string, m deviceConfig.Device) (uint32, error) {
 		Name:       hostName,
 		Mode:       "tap",
 		MultiQueue: true,
+		Master:     m["vrf"],
 	}
 
 	err := tuntap.Add()

internal/server/device/nic_routed.go

@@ -80,6 +80,7 @@ func (d *nicRouted) validateConfig(instConf instance.ConfigReader) error {
 		"ipv4.host_table",
 		"ipv6.host_table",
 		"gvrp",
+		"vrf",
 	}
 
 	rules := nicValidationRules(requiredFields, optionalFields, instConf)
@@ -88,6 +89,7 @@ func (d *nicRouted) validateConfig(instConf instance.ConfigReader) error {
 	rules["gvrp"] = validate.Optional(validate.IsBool)
 	rules["ipv4.neighbor_probe"] = validate.Optional(validate.IsBool)
 	rules["ipv6.neighbor_probe"] = validate.Optional(validate.IsBool)
+	rules["vrf"] = validate.Optional(validate.IsAny)
 
 	err = d.config.Validate(rules)
 	if err != nil {
@@ -216,6 +218,13 @@ func (d *nicRouted) validateEnvironment() error {
 		}
 	}
 
+	if d.config["vrf"] != "" {
+		// Check vrf interface exists
+		if !network.InterfaceExists(d.config["vrf"]) {
+			return fmt.Errorf("VRF %q doesn't exist", d.config["vrf"])
+		}
+	}
+
 	return nil
 }
 
@@ -405,14 +414,21 @@ func (d *nicRouted) Start() (*deviceConfig.RunConfig, error) {
 			}
 		}
 
+		table := "main"
+
+		if d.config["vrf"] != "" {
+			table = ""
+		}
+
 		// Perform per-address host-side configuration (static routes and neighbour proxy entries).
 		for _, addrStr := range addresses {
-			// Apply host-side static routes to main routing table.
+			// Apply host-side static routes to main/vrf routing table.
 			r := ip.Route{
 				DevName: saveData["host_name"],
 				Route:   fmt.Sprintf("%s/%d", addrStr, subnetSize),
-				Table:   "main",
+				Table:   table,
 				Family:  ipFamilyArg,
+				VRF:     d.config["vrf"],
 			}
 
 			err = r.Add()
@@ -466,9 +482,10 @@ func (d *nicRouted) Start() (*deviceConfig.RunConfig, error) {
 				r := ip.Route{
 					DevName: saveData["host_name"],
 					Route:   routeStr,
-					Table:   "main",
+					Table:   table,
 					Family:  ipFamilyArg,
 					Via:     addresses[0],
+					VRF:     d.config["vrf"],
 				}
 
 				err = r.Add()

internal/server/ip/link_veth.go

@@ -1,12 +1,28 @@
 package ip
 
+import "github.com/lxc/incus/v6/shared/subprocess"
+
 // Veth represents arguments for link of type veth.
 type Veth struct {
 	Link
-	Peer Link
+	Peer   Link
+	Master string
 }
 
 // Add adds new virtual link.
 func (veth *Veth) Add() error {
-	return veth.Link.add("veth", append([]string{"peer"}, veth.Peer.args()...))
+	err := veth.Link.add("veth", append([]string{"peer"}, veth.Peer.args()...))
+
+	if err != nil {
+		return err
+	}
+
+	if veth.Master != "" {
+		_, err := subprocess.RunCommand("ip", "link", "set", veth.Name, "master", veth.Master)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
 }

internal/server/ip/route.go

@@ -15,6 +15,7 @@ type Route struct {
 	Proto   string
 	Family  string
 	Via     string
+	VRF     string
 }
 
 // Add adds new route.
@@ -37,6 +38,10 @@ func (r *Route) Add() error {
 		cmd = append(cmd, "proto", r.Proto)
 	}
 
+	if r.VRF != "" {
+		cmd = append(cmd, "vrf", r.VRF)
+	}
+
 	_, err := subprocess.RunCommand("ip", cmd...)
 	if err != nil {
 		return err
@@ -47,7 +52,15 @@ func (r *Route) Add() error {
 
 // Delete deletes routing table.
 func (r *Route) Delete() error {
-	_, err := subprocess.RunCommand("ip", r.Family, "route", "delete", "table", r.Table, r.Route, "dev", r.DevName)
+	cmd := []string{r.Family, "route", "delete", r.Route, "dev", r.DevName}
+
+	if r.VRF != "" {
+		cmd = append(cmd, "vrf", r.VRF)
+	} else if r.Table != "" {
+		cmd = append(cmd, "table", r.Table)
+	}
+
+	_, err := subprocess.RunCommand("ip", cmd...)
 	if err != nil {
 		return err
 	}
@@ -76,6 +89,10 @@ func (r *Route) Flush() error {
 		cmd = append(cmd, "proto", r.Proto)
 	}
 
+	if r.VRF != "" {
+		cmd = append(cmd, "vrf", r.VRF)
+	}
+
 	_, err := subprocess.RunCommand("ip", cmd...)
 	if err != nil {
 		return err
@@ -87,6 +104,11 @@ func (r *Route) Flush() error {
 // Replace changes or adds new route.
 func (r *Route) Replace(routes []string) error {
 	cmd := []string{r.Family, "route", "replace", "dev", r.DevName, "proto", r.Proto}
+
+	if r.VRF != "" {
+		cmd = append(cmd, "vrf", r.VRF)
+	}
+
 	cmd = append(cmd, routes...)
 	_, err := subprocess.RunCommand("ip", cmd...)
 	if err != nil {
@@ -99,7 +121,14 @@ func (r *Route) Replace(routes []string) error {
 // Show lists routes.
 func (r *Route) Show() ([]string, error) {
 	routes := []string{}
-	out, err := subprocess.RunCommand("ip", r.Family, "route", "show", "dev", r.DevName, "proto", r.Proto)
+
+	cmd := []string{r.Family, "route", "show", "dev", r.DevName, "proto", r.Proto}
+
+	if r.VRF != "" {
+		cmd = append(cmd, "vrf", r.VRF)
+	}
+
+	out, err := subprocess.RunCommand("ip", cmd...)
 	if err != nil {
 		return routes, err
 	}

internal/server/ip/tuntap.go

@@ -9,6 +9,7 @@ type Tuntap struct {
 	Name       string
 	Mode       string
 	MultiQueue bool
+	Master     string
 }
 
 // Add adds new tuntap interface.
@@ -23,5 +24,12 @@ func (t *Tuntap) Add() error {
 		return err
 	}
 
+	if t.Master != "" {
+		_, err := subprocess.RunCommand("ip", "link", "set", t.Name, "master", t.Master)
+		if err != nil {
+			return err
+		}
+	}
+
 	return nil
 }

test/suites/container_devices_nic_routed.sh

@@ -217,6 +217,36 @@ test_container_devices_nic_routed() {
   ip -4 route show table 100 | grep "192.0.2.1${ipRand}"
   ip -6 route show table 101 | grep "2001:db8::1${ipRand}"
 
+  # Undo settings
+  incus stop -f "${ctName}"
+  incus config device unset "${ctName}" eth0 vlan
+  incus config device unset "${ctName}" eth0 ipv4.host_table
+  incus config device unset "${ctName}" eth0 ipv6.host_table
+
+  # Add VRF
+  ip link add test_vrf type vrf table 120
+
+  # Check nic interface not in the vrf
+  ! ip link show master test_vrf | grep "veth"
+
+  # Configure VRF on nic
+  incus config device set "${ctName}" eth0 vrf="test_vrf"
+  incus start "${ctName}"
+
+  # Check nic interface is in the vrf
+  ip link show master test_vrf | grep "veth"
+
+  # Check routes are in the vrf
+  ip -4 route show vrf test_vrf | grep "192.0.2.1${ipRand}"
+  ip -6 route show vrf test_vrf | grep "2001:db8::1${ipRand}"
+
+  # Check no routes in the main table
+  ! ip -4 route show table main | grep "192.0.2.1${ipRand}"
+  ! ip -6 route show table main | grep "2001:db8::1${ipRand}"
+
+  # Delete test VRF
+  ip link delete test_vrf
+
   # Check volatile cleanup on stop.
   incus stop -f "${ctName}"
   if incus config show "${ctName}" | grep volatile.eth0 | grep -v volatile.eth0.hwaddr | grep -v volatile.eth0.name ; then