Add support for multiple IP prefixes

app.go

@@ -68,7 +68,7 @@ type Config struct {
 	ServerURL                      string
 	Addr                           string
 	EphemeralNodeInactivityTimeout time.Duration
-	IPPrefix                       netaddr.IPPrefix
+	IPPrefixes                     []netaddr.IPPrefix
 	PrivateKeyPath                 string
 	BaseDomain                     string
 
@@ -197,9 +197,7 @@ func NewHeadscale(cfg Config) (*Headscale, error) {
 	}
 
 	if app.cfg.DNSConfig != nil && app.cfg.DNSConfig.Proxied { // if MagicDNS
-		magicDNSDomains := generateMagicDNSRootDomains(
-			app.cfg.IPPrefix,
-		)
+		magicDNSDomains := generateMagicDNSRootDomains(app.cfg.IPPrefixes)
 		// we might have routes already from Split DNS
 		if app.cfg.DNSConfig.Routes == nil {
 			app.cfg.DNSConfig.Routes = make(map[string][]dnstype.Resolver)