[src/trunk]: src/external/bsd/bind/dist/lib/isc/unix Apply suggested fix from...

[he <he%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b7ef6f9a56ec
branches:  trunk
changeset: 836457:b7ef6f9a56ec
user:      he <he%NetBSD.org@localhost>
date:      Thu Oct 18 14:30:54 2018 +0000

description:
Apply suggested fix from https://gitlab.isc.org/isc-projects/bind9/issues/589.
This would on NetBSD prevent UDP replies > 1432 bytes in size
transported over IPv4, because an IPv6 control message is applied
on an IPv4 socket, which will subsequently be refused.  Therefore,
apply that control mssage only on IPv6 sockets.

diffstat:

 external/bsd/bind/dist/lib/isc/unix/socket.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (19 lines):

diff -r f0e737b0e177 -r b7ef6f9a56ec external/bsd/bind/dist/lib/isc/unix/socket.c
--- a/external/bsd/bind/dist/lib/isc/unix/socket.c      Thu Oct 18 13:33:10 2018 +0000
+++ b/external/bsd/bind/dist/lib/isc/unix/socket.c      Thu Oct 18 14:30:54 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: socket.c,v 1.23 2018/08/13 08:46:53 christos Exp $     */
+/*     $NetBSD: socket.c,v 1.24 2018/10/18 14:30:54 he Exp $   */
 
 /*
  * Copyright (C) 2004-2018  Internet Systems Consortium, Inc. ("ISC")
@@ -1548,7 +1548,8 @@
 
 #if defined(IPV6_USE_MIN_MTU)
        if ((sock->type == isc_sockettype_udp) &&
-           ((dev->attributes & ISC_SOCKEVENTATTR_USEMINMTU) != 0))
+           ((dev->attributes & ISC_SOCKEVENTATTR_USEMINMTU) != 0) &&
+           (sock->pf == AF_INET6))
        {
                int use_min_mtu = 1;    /* -1, 0, 1 */