util: replace net.IPNet with pointer

internal/util/network.go

@@ -15,12 +15,12 @@ import (
 
 // NetInterface represents a list of network interfaces
 type NetInterface struct {
-	Name         string      // Network interface name
-	MTU          int         // MTU
-	HardwareAddr string      // Hardware address
-	Addresses    []net.IP    // Array with the network interface addresses
-	Subnets      []net.IPNet // Array with CIDR addresses of this network interface
-	Flags        string      // Network interface flags (up, broadcast, etc)
+	Name         string       // Network interface name
+	MTU          int          // MTU
+	HardwareAddr string       // Hardware address
+	Addresses    []net.IP     // Array with the network interface addresses
+	Subnets      []*net.IPNet // Array with CIDR addresses of this network interface
+	Flags        string       // Network interface flags (up, broadcast, etc)
 }
 
 // GetValidNetInterfaces returns interfaces that are eligible for DNS and/or DHCP
@@ -79,7 +79,7 @@ func GetValidNetInterfacesForWeb() ([]NetInterface, error) {
 				continue
 			}
 			netIface.Addresses = append(netIface.Addresses, ipNet.IP)
-			netIface.Subnets = append(netIface.Subnets, *ipNet)
+			netIface.Subnets = append(netIface.Subnets, ipNet)
 		}
 
 		// Discard interfaces with no addresses
@@ -120,7 +120,7 @@ func GetSubnet(ifaceName string) *net.IPNet {
 
 	for _, netIface := range netIfaces {
 		if netIface.Name == ifaceName && len(netIface.Subnets) > 0 {
-			return &netIface.Subnets[0]
+			return netIface.Subnets[0]
 		}
 	}