dhcpsvc: imp docs

internal/dhcpsvc/v4.go

@@ -30,8 +30,8 @@ type IPv4Config struct {
 	RangeEnd netip.Addr
 
 	// Options is the list of DHCP options to send to DHCP clients.  The options
-	// with zero length are treated as deletions of the corresponding options,
-	// either implicit or explicit.
+	// having a zero value within the Length field are treated as deletions of
+	// the corresponding options, either implicit or explicit.
 	Options layers.DHCPOptions
 
 	// LeaseDuration is the TTL of a DHCP lease.
@@ -130,6 +130,8 @@ func newIface4(name string, conf *IPv4Config) (i *iface4, err error) {
 // options returns the implicit and explicit options for the interface.  The two
 // lists are disjoint and the implicit options are initialized with default
 // values.
+//
+// TODO(e.burkov):  DRY with the IPv6 version.
 func (conf *IPv4Config) options() (implicit, explicit layers.DHCPOptions) {
 	// Set default values of host configuration parameters listed in Appendix A
 	// of RFC-2131.  Keep the list sorted by option code for using the binary
@@ -306,8 +308,8 @@ func (conf *IPv4Config) options() (implicit, explicit layers.DHCPOptions) {
 		}
 	}
 
-	log.Debug("dhcpv4: implicit options: %s", implicit)
-	log.Debug("dhcpv4: explicit options: %s", explicit)
+	log.Debug("dhcpsvc: v4: implicit options: %s", implicit)
+	log.Debug("dhcpsvc: v4: explicit options: %s", explicit)
 
 	return implicit, explicit
 }

internal/dhcpsvc/v6.go

@@ -123,8 +123,8 @@ func (conf *IPv6Config) options() (implicit, explicit layers.DHCPv6Options) {
 		explicit = append(explicit, exp)
 	}
 
-	log.Debug("dhcpv6: implicit options: %s", implicit)
-	log.Debug("dhcpv6: explicit options: %s", explicit)
+	log.Debug("dhcpsvc: v6: implicit options: %s", implicit)
+	log.Debug("dhcpsvc: v6: explicit options: %s", explicit)
 
 	return implicit, explicit
 }