send router solicitation

display.go

@@ -325,11 +325,8 @@ func startBacklightTickers() {
 		dimTicker = time.NewTicker(time.Duration(config.DisplayDimAfterSec) * time.Second)
 
 		go func() {
-			for { //nolint:staticcheck
-				select {
-				case <-dimTicker.C:
-					tick_displayDim()
-				}
+			for range dimTicker.C {
+				tick_displayDim()
 			}
 		}()
 	}
@@ -339,11 +336,8 @@ func startBacklightTickers() {
 		offTicker = time.NewTicker(time.Duration(config.DisplayOffAfterSec) * time.Second)
 
 		go func() {
-			for { //nolint:staticcheck
-				select {
-				case <-offTicker.C:
-					tick_displayOff()
-				}
+			for range offTicker.C {
+				tick_displayOff()
 			}
 		}()
 	}

go.mod

@@ -61,6 +61,7 @@ require (
 	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/mattn/go-colorable v0.1.14 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mdlayher/ndp v1.1.0 // indirect
 	github.com/mdlayher/packet v1.1.2 // indirect
 	github.com/mdlayher/socket v0.4.1 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect

go.sum

@@ -99,6 +99,8 @@ github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/
 github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mdlayher/ndp v1.1.0 h1:QylGKGVtH60sKZUE88+IW5ila1Z/M9/OXhWdsVKuscs=
+github.com/mdlayher/ndp v1.1.0/go.mod h1:FmgESgemgjl38vuOIyAHWUUL6vQKA/pQNkvXdWsdQFM=
 github.com/mdlayher/packet v1.1.2 h1:3Up1NG6LZrsgDVn6X4L9Ge/iyRyxFEFD9o6Pr3Q1nQY=
 github.com/mdlayher/packet v1.1.2/go.mod h1:GEu1+n9sG5VtiRE4SydOmX5GTwyyYlteZiFU+x0kew4=
 github.com/mdlayher/socket v0.4.1 h1:eM9y2/jlbs1M615oshPQOHZzj6R6wMT7bX5NPiQvn2U=

pkg/nmlite/interface.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net"
+	"net/netip"
 
 	"time"
 
@@ -13,6 +14,7 @@ import (
 	"github.com/jetkvm/kvm/internal/logging"
 	"github.com/jetkvm/kvm/internal/network/types"
 	"github.com/jetkvm/kvm/pkg/nmlite/link"
+	"github.com/mdlayher/ndp"
 	"github.com/rs/zerolog"
 	"github.com/vishvananda/netlink"
 )
@@ -453,6 +455,10 @@ func (im *InterfaceManager) applyIPv6SLAAC() error {
 		return fmt.Errorf("failed to remove non-link-local IPv6 addresses: %w", err)
 	}
 
+	if err := im.SendRouterSolicitation(); err != nil {
+		return fmt.Errorf("failed to send router solicitation: %w", err)
+	}
+
 	// Enable SLAAC
 	return im.staticConfig.EnableIPv6SLAAC()
 }
@@ -545,6 +551,48 @@ func (im *InterfaceManager) handleLinkStateChange(link *link.Link) {
 	}
 }
 
+// SendRouterSolicitation sends a router solicitation
+func (im *InterfaceManager) SendRouterSolicitation() error {
+	im.logger.Info().Msg("sending router solicitation")
+	m := &ndp.RouterSolicitation{}
+
+	l, err := im.link()
+	if err != nil {
+		return fmt.Errorf("failed to get interface: %w", err)
+	}
+
+	iface := l.Interface()
+	if iface == nil {
+		return fmt.Errorf("failed to get net.Interface for %s", im.ifaceName)
+	}
+
+	hwAddr := l.HardwareAddr()
+	if hwAddr == nil {
+		return fmt.Errorf("failed to get hardware address for %s", im.ifaceName)
+	}
+
+	c, _, err := ndp.Listen(iface, ndp.LinkLocal)
+	defer c.Close()
+	if err != nil {
+		return fmt.Errorf("failed to create NDP listener on %s: %w", im.ifaceName, err)
+	}
+
+	m.Options = append(m.Options, &ndp.LinkLayerAddress{
+		Addr:      hwAddr,
+		Direction: ndp.Source,
+	})
+
+	targetAddr := netip.MustParseAddr("ff02::2")
+
+	if err := c.WriteTo(m, nil, targetAddr); err != nil {
+		return fmt.Errorf("failed to write to %s: %w", targetAddr.String(), err)
+	}
+
+	im.logger.Info().Msg("router solicitation sent")
+
+	return nil
+}
+
 func (im *InterfaceManager) handleLinkUp() {
 	im.logger.Info().Msg("link up")
 
@@ -553,6 +601,11 @@ func (im *InterfaceManager) handleLinkUp() {
 	if im.config.IPv4Mode.String == "dhcp" {
 		im.dhcpClient.Renew()
 	}
+
+	if im.config.IPv6Mode.String == "slaac" {
+		im.staticConfig.EnableIPv6SLAAC()
+		im.SendRouterSolicitation()
+	}
 }
 
 func (im *InterfaceManager) handleLinkDown() {

pkg/nmlite/link/netlink.go

@@ -37,6 +37,7 @@ type Link struct {
 	netlink.Link
 }
 
+// Refresh refreshes the link
 func (l *Link) Refresh() error {
 	linkName := l.Link.Attrs().Name
 	link, err := netlink.LinkByName(linkName)
@@ -50,6 +51,28 @@ func (l *Link) Refresh() error {
 	return nil
 }
 
+// Interface returns the interface of the link
+func (l *Link) Interface() *net.Interface {
+	attrs := l.Attrs()
+	if attrs.Name == "" {
+		return nil
+	}
+	iface, err := net.InterfaceByName(attrs.Name)
+	if err != nil {
+		return nil
+	}
+	return iface
+}
+
+// HardwareAddr returns the hardware address of the link
+func (l *Link) HardwareAddr() net.HardwareAddr {
+	attrs := l.Attrs()
+	if attrs.HardwareAddr == nil {
+		return nil
+	}
+	return attrs.HardwareAddr
+}
+
 // Attrs returns the attributes of the link
 func (l *Link) Attrs() *netlink.LinkAttrs {
 	return l.Link.Attrs()