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ip/dhcp6d: only announce all-dhcp-servers multicast address on interface with link-local address on it

--- a/sys/src/cmd/ip/dhcp6d.c

+++ b/sys/src/cmd/ip/dhcp6d.c

@@ -134,6 +134,7 @@

 	int fd, cfd;

 	char data[128], devdir[40];

 	Ipifc *ifc;

+	Iplifc *lifc;

 	sprint(data, "%s/udp!*!dhcp6s", net);

 	cfd = announce(data, devdir);

@@ -144,12 +145,14 @@

 	ipifcs = readipifc(net, ipifcs, -1);

 	for(ifc = ipifcs; ifc != nil; ifc = ifc->next){

-		if(ifc->lifc == nil)

-			continue;

 		if(strcmp(ifc->dev, "/dev/null") == 0)

 			continue;

-		if(fprint(cfd, "addmulti %I ff02::1:2", ifc->lifc->ip) < 0)

-			fprint(2, "can't add interface %s: %r", ifc->dev);

+		for(lifc = ifc->lifc; lifc != nil; lifc = lifc->next){

+			if(ISIPV6LINKLOCAL(lifc->ip))

+				continue;

+			if(fprint(cfd, "addmulti %I ff02::1:2", lifc->ip) < 0)

+				fprint(2, "addmulti: %I: %r\n", lifc->ip);

+		}

 	}

 	sprint(data, "%s/data", devdir);