Remove nftables updates from Excludes

Remove nftables updates from Excludes methods. Instead, return whether
excludes were changed and let caller update nftables.

Signed-off-by: hwipl <33433250+hwipl@users.noreply.github.com>

internal/splitrt/excludes.go

@@ -1,10 +1,8 @@
 package splitrt
 
 import (
-	"context"
 	"net/netip"
 	"sync"
-	"time"
 
 	log "github.com/sirupsen/logrus"
 	"github.com/telekom-mms/oc-daemon/internal/daemoncfg"
@@ -31,9 +29,10 @@ type Excludes struct {
 	closed chan struct{}
 }
 
-// setFilter resets the excludes in netfilter.
-func (e *Excludes) setFilter(ctx context.Context) {
-	log.Debug("SplitRouting resetting excludes in netfilter")
+// GetPrefixes returns static and dynamic split excludes as Prefixes.
+func (e *Excludes) GetPrefixes() []netip.Prefix {
+	e.Lock()
+	defer e.Unlock()
 
 	addresses := []netip.Prefix{}
 	for _, v := range e.s {
@@ -43,18 +42,18 @@ func (e *Excludes) setFilter(ctx context.Context) {
 		prefix := netip.PrefixFrom(k, k.BitLen())
 		addresses = append(addresses, prefix)
 	}
-	setExcludes(ctx, addresses)
+
+	return addresses
 }
 
 // AddStatic adds a static entry to the split excludes.
-func (e *Excludes) AddStatic(ctx context.Context, address netip.Prefix) {
+func (e *Excludes) AddStatic(address netip.Prefix) bool {
 	log.WithField("address", address).Debug("SplitRouting adding static exclude")
 	e.Lock()
 	defer e.Unlock()
 
 	// make sure new prefix in address does not overlap with existing
 	// prefixes in static excludes
-	removed := false
 	for k, v := range e.s {
 		if !v.Overlaps(address) {
 			// no overlap
@@ -63,38 +62,31 @@ func (e *Excludes) AddStatic(ctx context.Context, address netip.Prefix) {
 		if v.Bits() <= address.Bits() {
 			// new prefix is already in existing prefix,
 			// do not add it
-			return
+			return false
 		}
 
 		// new prefix contains old prefix, remove old prefix
 		delete(e.s, k)
-		removed = true
 	}
 
 	// add new prefix to static excludes
 	key := address.String()
 	e.s[key] = address
 
-	// add to netfilter
-	if removed {
-		// existing entries removed, we need to reset all excludes
-		e.setFilter(ctx)
-		return
-	}
-	// single new entry, add it
-	addExclude(ctx, address)
+	// update netfilter
+	return true
 }
 
 // AddDynamic adds a dynamic entry to the split excludes.
-func (e *Excludes) AddDynamic(ctx context.Context, address netip.Prefix, ttl uint32) {
+func (e *Excludes) AddDynamic(address netip.Prefix, ttl uint32) bool {
 	log.WithFields(log.Fields{
 		"address": address,
 		"ttl":     ttl,
 	}).Debug("SplitRouting adding dynamic exclude")
 
 	if !address.IsSingleIP() {
 		log.Error("SplitRouting error adding dynamic exclude with multiple IPs")
-		return
+		return false
 	}
 	a := address.Addr()
 
@@ -104,7 +96,7 @@ func (e *Excludes) AddDynamic(ctx context.Context, address netip.Prefix, ttl uin
 	// make sure new ip address is not in existing static excludes
 	for _, v := range e.s {
 		if v.Contains(a) {
-			return
+			return false
 		}
 	}
 
@@ -113,7 +105,7 @@ func (e *Excludes) AddDynamic(ctx context.Context, address netip.Prefix, ttl uin
 	if old != nil {
 		old.ttl = ttl
 		old.updated = true
-		return
+		return false
 	}
 
 	// create new entry in dynamic excludes
@@ -122,21 +114,25 @@ func (e *Excludes) AddDynamic(ctx context.Context, address netip.Prefix, ttl uin
 		updated: true,
 	}
 
-	// add to netfilter
-	addExclude(ctx, address)
+	// update netfilter
+	return true
 }
 
 // RemoveStatic removes a static entry from the split excludes.
-func (e *Excludes) RemoveStatic(ctx context.Context, address netip.Prefix) {
+func (e *Excludes) RemoveStatic(address netip.Prefix) bool {
 	e.Lock()
 	defer e.Unlock()
 
-	delete(e.s, address.String())
-	e.setFilter(ctx)
+	addr := address.String()
+	if _, ok := e.s[addr]; !ok {
+		return false
+	}
+	delete(e.s, addr)
+	return true
 }
 
 // cleanup cleans up the dynamic split excludes.
-func (e *Excludes) cleanup(ctx context.Context) {
+func (e *Excludes) cleanup() bool {
 	e.Lock()
 	defer e.Unlock()
 
@@ -160,43 +156,7 @@ func (e *Excludes) cleanup(ctx context.Context) {
 	}
 
 	// if entries were changed, reset netfilter
-	if changed {
-		e.setFilter(ctx)
-	}
-}
-
-// start starts periodic cleanup of the split excludes.
-func (e *Excludes) start() {
-	defer close(e.closed)
-
-	ctx := context.Background()
-	timer := time.NewTimer(excludesTimer * time.Second)
-	for {
-		select {
-		case <-timer.C:
-			e.cleanup(ctx)
-			timer.Reset(excludesTimer * time.Second)
-
-		case <-e.done:
-			if !timer.Stop() {
-				<-timer.C
-			}
-			return
-		}
-	}
-}
-
-// Start starts periodic cleanup of the split excludes.
-func (e *Excludes) Start() {
-	log.Debug("SplitRouting starting periodic cleanup of excludes")
-	go e.start()
-}
-
-// Stop stops periodic cleanup of the split excludes.
-func (e *Excludes) Stop() {
-	close(e.done)
-	<-e.closed
-	log.Debug("SplitRouting stopped periodic cleanup of excludes")
+	return changed
 }
 
 // List returns the list of static and dynamic excludes.