Broadcast address can be specified when adding address.

addr.go

@@ -10,10 +10,11 @@ import (
 // include a mask, so it stores the address as a net.IPNet.
 type Addr struct {
 	*net.IPNet
-	Label string
-	Flags int
-	Scope int
-	Peer  *net.IPNet
+	Label     string
+	Flags     int
+	Scope     int
+	Peer      *net.IPNet
+	Broadcast net.IP
 }
 
 // String returns $ip/$netmask $label

addr_linux.go

@@ -90,6 +90,10 @@ func (h *Handle) addrHandle(link Link, addr *Addr, req *nl.NetlinkRequest) error
 		}
 	}
 
+	if addr.Broadcast != nil {
+		req.AddData(nl.NewRtAttr(syscall.IFA_BROADCAST, addr.Broadcast))
+	}
+
 	if addr.Label != "" {
 		labelData := nl.NewRtAttr(syscall.IFA_LABEL, nl.ZeroTerminated(addr.Label))
 		req.AddData(labelData)