From: Toke Høiland-Jørgensen <toke@toke.dk>
Date: Mon, 10 May 2021 17:49:43 +0000 (+0200)
Subject: BSD: Propagate OS-level IFF_MULTICAST to internal IF_MULTICAST flag
X-Git-Tag: v2.0.9~76
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b17adf073594974b05a60ddaaa6e36da4eac4831;p=thirdparty%2Fbird.git

BSD: Propagate OS-level IFF_MULTICAST to internal IF_MULTICAST flag

The BSD code did not propagate the OS-level IFF_MULTICAST flag to the
Bird-internal IF_MULTICAST flag, which causes problems with Wireguard
interfaces on FreeBSD. The Linux sysdep code does propagate the flag
already, so just copy over the same check and flag update.
---

diff --git a/sysdep/bsd/krt-sock.c b/sysdep/bsd/krt-sock.c
index ea0cc4d9a..5c905bc97 100644
--- a/sysdep/bsd/krt-sock.c
+++ b/sysdep/bsd/krt-sock.c
@@ -665,6 +665,9 @@ krt_read_ifinfo(struct ks_msg *msg, int scan)
   else
     f.flags |= IF_MULTIACCESS;      /* NBMA */
 
+  if (fl & IFF_MULTICAST)
+    f.flags |= IF_MULTICAST;
+
   iface = if_update(&f);
 
   if (!scan)