[OpenWrt-Devel] [PATCH] [netifd] enable MULTICAST on GRE

Nick Podolak nicholas.e.podolak at gmail.com
Fri Aug 14 21:09:14 EDT 2015

This patch enables multicast by for gre tunnels.  I've only ever used
GRE to enable routing algorithms and other multicast applications over
otherwise non-multicast capable links (wan, ipsec) so this default
behavior makes more sense to me.

Signed-off-by: Nicholas Podolak <nicholas.e.podolak at gmail.com>

Index: netifd-2015-06-08/system-linux.c
--- netifd-2015-06-08.orig/system-linux.c
+++ netifd-2015-06-08/system-linux.c
@@ -2063,8 +2063,11 @@ static int system_add_gre_tunnel(const c
  nla_nest_end(nlm, infodata);
  nla_nest_end(nlm, linkinfo);

- return system_rtnl_call(nlm);
+ ret = system_rtnl_call(nlm);

+ system_if_flags(name, IFF_MULTICAST, 0);
+ return ret;
  return ret;
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