shithub: riscv

Info  •  Files  •  Log  •  Branches

devip: fix multicastarp() when ipconfig assigned the 0 address

sending multicast was broken when ipconfig assigned the 0
address for dhcp as they would wrongly classified as Runi.

this could happen when we do slaac and dhcp in parallel,
breaking the sending of router solicitations.

--- a/sys/src/9/ip/ethermedium.c

+++ b/sys/src/9/ip/ethermedium.c

@@ -717,14 +717,9 @@

 multicastarp(Fs *f, Arpent *a, Medium *medium, uchar *mac)

 {

 	/* is it broadcast? */

-	switch(ipforme(f, a->ip)){

-	case Runi:

-		return nil;

-	case Rbcast:

-		memset(mac, 0xff, 6);

+	if(ipforme(f, a->ip) == Rbcast){

+		memset(mac, 0xff, medium->maclen);

 		return arpresolve(f->arp, a, medium, mac);

-	default:

-		break;

 	}

 	/* if multicast, fill in mac */