From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Tue, 31 Mar 2015 21:59:40 +0000 (+0200)
Subject: Understand IFF_MULTICAST flag on ifaces in Linux
X-Git-Tag: v1.5.0~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=16a3254c4cb592e7cfa3aea744e9fd58665d6367;p=thirdparty%2Fbird.git

Understand IFF_MULTICAST flag on ifaces in Linux

Unfortunately, some interfaces support multicast but do not have
this flag set, so we use it only as a positive hint.

Thanks to Clint Armstrong for noticing the problem.
---

diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c
index 860c8601d..48dd8babb 100644
--- a/sysdep/linux/netlink.c
+++ b/sysdep/linux/netlink.c
@@ -436,6 +436,9 @@ nl_parse_link(struct nlmsghdr *h, int scan)
       else
 	f.flags |= IF_MULTIACCESS;	/* NBMA */
 
+      if (fl & IFF_MULTICAST)
+	f.flags |= IF_MULTICAST;
+
       ifi = if_update(&f);
 
       if (!scan)