[Olsr-users] Solved: IPv6: Using link-local all-hosts multicast address ff02::1 instead of ff0e::1 with Linux?

[Joerg Pommnitz]

Found it!
Using link-local addresses the Linux kernel looks at the sin6_scope_id
member of a struct sockaddr_in6. This one was randomly initialized.
Patch (against 0.5.3):

--- src/unix/ifnet.c	(revision 1975)
+++ src/unix/ifnet.c	(working copy)
@@ -776,13 +776,14 @@
       OLSR_PRINTF(debuglvl, "\tAddress: %s\n", ip6_to_string(&ifs.int6_addr.sin6_addr));
       
       /* Multicast */
+      memset (&ifs.int6_multaddr, 0, sizeof (ifs.int6_multaddr));
+      ifs.int6_multaddr.sin6_family   = AF_INET6;
+      ifs.int6_multaddr.sin6_flowinfo = htonl(0);
+      ifs.int6_multaddr.sin6_scope_id = if_nametoindex(ifr.ifr_name);
+      ifs.int6_multaddr.sin6_port     = htons(OLSRPORT);
       ifs.int6_multaddr.sin6_addr = (iface->cnf->ipv6_addrtype == IPV6_ADDR_SITELOCAL) ? 
 	iface->cnf->ipv6_multi_site.v6 :
 	iface->cnf->ipv6_multi_glbl.v6;
-      /* Set address family */
-      ifs.int6_multaddr.sin6_family = AF_INET6;
-      /* Set port */
-      ifs.int6_multaddr.sin6_port = htons(OLSRPORT);
       
 #ifdef __MacOSX__
       ifs.int6_multaddr.sin6_scope_id = 0;



-- 
Regards
       Joerg

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