fix(network): IPv6 addresses sorting was using wrong references

pkg/nmlite/interface_state.go

@@ -2,21 +2,59 @@ package nmlite
 
 import (
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/jetkvm/kvm/internal/network/types"
 	"github.com/jetkvm/kvm/pkg/nmlite/link"
 	"github.com/vishvananda/netlink"
 )
 
+type IfStateChangeReason uint
+
+const (
+	IfStateOperStateChanged   IfStateChangeReason = 1
+	IfStateOnlineStateChanged IfStateChangeReason = 2
+	IfStateMACAddressChanged  IfStateChangeReason = 3
+	IfStateIPAddressesChanged IfStateChangeReason = 4
+)
+
+type IfStateChangeReasons []IfStateChangeReason
+
+func (r IfStateChangeReason) String() string {
+	switch r {
+	case IfStateOperStateChanged:
+		return "oper state changed"
+	case IfStateOnlineStateChanged:
+		return "online state changed"
+	case IfStateMACAddressChanged:
+		return "MAC address changed"
+	case IfStateIPAddressesChanged:
+		return "IP addresses changed"
+	default:
+		return fmt.Sprintf("unknown change reason %d", r)
+	}
+}
+
+func (rs IfStateChangeReasons) String() string {
+	reasons := []string{}
+	for _, r := range rs {
+		reasons = append(reasons, r.String())
+	}
+	return strings.Join(reasons, ", ")
+}
+
 // updateInterfaceState updates the current interface state
 func (im *InterfaceManager) updateInterfaceState() error {
 	nl, err := im.link()
 	if err != nil {
 		return fmt.Errorf("failed to get interface: %w", err)
 	}
 
-	var stateChanged bool
+	var (
+		stateChanged  bool
+		changeReasons IfStateChangeReasons
+	)
 
 	attrs := nl.Attrs()
 
@@ -29,34 +67,41 @@ func (im *InterfaceManager) updateInterfaceState() error {
 	if im.state.Up != isUp {
 		im.state.Up = isUp
 		stateChanged = true
+		changeReasons = append(changeReasons, IfStateOperStateChanged)
 	}
 
 	// Check if the interface is online
 	isOnline := isUp && nl.HasGlobalUnicastAddress()
 	if im.state.Online != isOnline {
 		im.state.Online = isOnline
 		stateChanged = true
+		changeReasons = append(changeReasons, IfStateOnlineStateChanged)
 	}
 
 	// Check if the MAC address has changed
 	if im.state.MACAddress != attrs.HardwareAddr.String() {
 		im.state.MACAddress = attrs.HardwareAddr.String()
 		stateChanged = true
+		changeReasons = append(changeReasons, IfStateMACAddressChanged)
 	}
 
 	// Update IP addresses
 	if ipChanged, err := im.updateInterfaceStateAddresses(nl); err != nil {
 		im.logger.Error().Err(err).Msg("failed to update IP addresses")
 	} else if ipChanged {
 		stateChanged = true
+		changeReasons = append(changeReasons, IfStateIPAddressesChanged)
 	}
 
 	im.state.LastUpdated = time.Now()
 	im.stateMu.Unlock()
 
 	// Notify callback if state changed
 	if stateChanged && im.onStateChange != nil {
-		im.logger.Debug().Interface("state", im.state).Msg("notifying state change")
+		im.logger.Debug().
+			Stringer("changeReasons", changeReasons).
+			Interface("state", im.state).
+			Msg("notifying state change")
 		im.onStateChange(*im.state)
 	}
 
@@ -80,6 +125,7 @@ func (im *InterfaceManager) updateInterfaceStateAddresses(nl *link.Link) (bool,
 		ipv6Gateway          string
 		ipv4Ready, ipv6Ready = false, false
 		stateChanged         = false
+		stateChangeReason    string
 	)
 
 	routes, _ := mgr.ListDefaultRoutes(link.AfInet6)
@@ -123,40 +169,55 @@ func (im *InterfaceManager) updateInterfaceStateAddresses(nl *link.Link) (bool,
 	if !sortAndCompareStringSlices(im.state.IPv4Addresses, ipv4Addresses) {
 		im.state.IPv4Addresses = ipv4Addresses
 		stateChanged = true
+		stateChangeReason = "IPv4 addresses changed"
 	}
 
 	if !sortAndCompareIPv6AddressSlices(im.state.IPv6Addresses, ipv6Addresses) {
 		im.state.IPv6Addresses = ipv6Addresses
 		stateChanged = true
+		stateChangeReason = "IPv6 addresses changed"
 	}
 
 	if im.state.IPv4Address != ipv4Addr {
 		im.state.IPv4Address = ipv4Addr
 		stateChanged = true
+		stateChangeReason = "IPv4 address changed"
 	}
 
 	if im.state.IPv6Address != ipv6Addr {
 		im.state.IPv6Address = ipv6Addr
 		stateChanged = true
+		stateChangeReason = "IPv6 address changed"
 	}
 	if im.state.IPv6LinkLocal != ipv6LinkLocal {
 		im.state.IPv6LinkLocal = ipv6LinkLocal
 		stateChanged = true
+		stateChangeReason = "IPv6 link local address changed"
 	}
 
 	if im.state.IPv6Gateway != ipv6Gateway {
 		im.state.IPv6Gateway = ipv6Gateway
 		stateChanged = true
+		stateChangeReason = "IPv6 gateway changed"
 	}
 
 	if im.state.IPv4Ready != ipv4Ready {
 		im.state.IPv4Ready = ipv4Ready
 		stateChanged = true
+		stateChangeReason = "IPv4 ready state changed"
 	}
 
 	if im.state.IPv6Ready != ipv6Ready {
 		im.state.IPv6Ready = ipv6Ready
 		stateChanged = true
+		stateChangeReason = "IPv6 ready state changed"
+	}
+
+	if stateChanged {
+		im.logger.Trace().
+			Str("changeReason", stateChangeReason).
+			Interface("state", im.state).
+			Msg("interface state changed")
 	}
 
 	return stateChanged, nil

pkg/nmlite/utils.go

@@ -42,17 +42,19 @@ func sortAndCompareStringSlices(a, b []string) bool {
 	return true
 }
 
+func sortIPv6AddressSlicesStable(a []types.IPv6Address) {
+	sort.SliceStable(a, func(i, j int) bool {
+		return a[i].Address.String() < a[j].Address.String()
+	})
+}
+
 func sortAndCompareIPv6AddressSlices(a, b []types.IPv6Address) bool {
 	if len(a) != len(b) {
 		return false
 	}
 
-	sort.SliceStable(a, func(i, j int) bool {
-		return a[i].Address.String() < b[j].Address.String()
-	})
-	sort.SliceStable(b, func(i, j int) bool {
-		return b[i].Address.String() < a[j].Address.String()
-	})
+	sortIPv6AddressSlicesStable(a)
+	sortIPv6AddressSlicesStable(b)
 
 	for i := range a {
 		if a[i].Address.String() != b[i].Address.String() {