[src/netbsd-1-4]: src/sys/netinet Apply patch (requested by thorpej):

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

details:   https://anonhg.NetBSD.org/src/rev/974d85623a27
branches:  netbsd-1-4
changeset: 470353:974d85623a27
user:      he <he%NetBSD.org@localhost>
date:      Sat Feb 12 18:10:24 2000 +0000

description:
Apply patch (requested by thorpej):
  Adhere to RFC 1112 and RFC 1122 by dropping incoming packets with
  a multicast source address.  Fixes part of PR#7003.

diffstat:

 sys/netinet/ip_input.c |  12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diffs (26 lines):

diff -r 20ce25163ff2 -r 974d85623a27 sys/netinet/ip_input.c
--- a/sys/netinet/ip_input.c    Sat Feb 12 17:01:32 2000 +0000
+++ b/sys/netinet/ip_input.c    Sat Feb 12 18:10:24 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ip_input.c,v 1.82.2.3 1999/10/17 23:59:59 cgd Exp $    */
+/*     $NetBSD: ip_input.c,v 1.82.2.4 2000/02/12 18:10:24 he Exp $     */
 
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -340,6 +340,16 @@
                }
                ip = mtod(m, struct ip *);
        }
+
+       /*
+        * RFC1122: packets with a multicast source address are
+        * not allowed.
+        */
+       if (IN_MULTICAST(ip->ip_src.s_addr)) {
+               /* XXX stat */
+               goto bad;
+       }
+
        if (in_cksum(m, hlen) != 0) {
                ipstat.ips_badsum++;
                goto bad;