tailcfg: add views for ControlDialPlan (#5843)

tailcfg/tailcfg_clone.go

@@ -398,9 +398,26 @@ var _SSHPrincipalCloneNeedsRegeneration = SSHPrincipal(struct {
 	PubKeys   []string
 }{})
 
+// Clone makes a deep copy of ControlDialPlan.
+// The result aliases no memory with the original.
+func (src *ControlDialPlan) Clone() *ControlDialPlan {
+	if src == nil {
+		return nil
+	}
+	dst := new(ControlDialPlan)
+	*dst = *src
+	dst.Candidates = append(src.Candidates[:0:0], src.Candidates...)
+	return dst
+}
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _ControlDialPlanCloneNeedsRegeneration = ControlDialPlan(struct {
+	Candidates []ControlIPCandidate
+}{})
+
 // Clone duplicates src into dst and reports whether it succeeded.
 // To succeed, <src, dst> must be of types <*T, *T> or <*T, **T>,
-// where T is one of User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode,SSHRule,SSHPrincipal.
+// where T is one of User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode,SSHRule,SSHPrincipal,ControlDialPlan.
 func Clone(dst, src any) bool {
 	switch src := src.(type) {
 	case *User:
@@ -511,6 +528,15 @@ func Clone(dst, src any) bool {
 			*dst = src.Clone()
 			return true
 		}
+	case *ControlDialPlan:
+		switch dst := dst.(type) {
+		case *ControlDialPlan:
+			*dst = *src.Clone()
+			return true
+		case **ControlDialPlan:
+			*dst = src.Clone()
+			return true
+		}
 	}
 	return false
 }