Make Headend policy no longer mandatory

Policy is not required for NextMN-ctrl

internal/config/headend.go

@@ -9,7 +9,7 @@ type Headend struct {
 	To                  string          `yaml:"to"` // IP Prefix this Headend will handle (can be the same as GTP4HeadendPrefix if you have a single Headend)
 	Provider            Provider        `yaml:"provider"`
 	Behavior            HeadendBehavior `yaml:"behavior"`
-	Policy              []Policy        `yaml:"policy"`
+	Policy              *[]Policy       `yaml:"policy,omitempty"`
 	SourceAddressPrefix *string         `yaml:"source-address-prefix"`
 	MTU                 *string         `yaml:mtu,omitempty"` // suggested value is 1400 (same as UERANSIM) if the path includes a End.M.GTP4.E
 }

internal/netfunc/headend.go

@@ -19,7 +19,10 @@ func NewHeadend(he *config.Headend, ttl uint8, hopLimit uint8, debug bool) (netf
 	}
 	switch he.Behavior {
 	case config.H_M_GTP4_D:
-		policy := he.Policy
+		if he.Policy == nil {
+			return nil, fmt.Errorf("Policy is nil")
+		}
+		policy := *he.Policy
 		if he.SourceAddressPrefix == nil {
 			return nil, fmt.Errorf("Missing source-address-prefix")
 		}

internal/tasks/linux-headend.go

@@ -36,7 +36,7 @@ func (t *TaskLinuxHeadend) RunInit() error {
 		return fmt.Errorf("No policy set for this headend")
 	}
 	seglist := ""
-	for _, p := range t.headend.Policy {
+	for _, p := range *t.headend.Policy {
 		if p.Match == nil {
 			seglist = p.Bsid.ToIPRoute2()
 			break
@@ -74,7 +74,7 @@ func (t *TaskLinuxHeadend) RunExit() error {
 		return fmt.Errorf("No policy set for this headend")
 	}
 	seglist := ""
-	for _, p := range t.headend.Policy {
+	for _, p := range *t.headend.Policy {
 		if p.Match == nil {
 			seglist = p.Bsid.ToIPRoute2()
 			break