From 46dfa5555565fdb77e9f5ff59c114436d47f1c7a Mon Sep 17 00:00:00 2001
From: itojun <itojun@NetBSD.org>
Date: Fri, 11 Feb 2000 05:57:58 +0000
Subject: [PATCH] fix in-kernel packet forwarding loop (till TTL becomes 0)
 when: - a packet is delivered to an address X, - and the address X is
 configured on my !IFF_UP interface - and ipforwarding=1

NetBSD PR: 9387
From: nrt@iij.ad.jp
---
 sys/netinet/ip_input.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/sys/netinet/ip_input.c b/sys/netinet/ip_input.c
index 366fd162d8e8..e61876df3364 100644
--- a/sys/netinet/ip_input.c
+++ b/sys/netinet/ip_input.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ip_input.c,v 1.96 2000/02/01 00:07:09 thorpej Exp $	*/
+/*	$NetBSD: ip_input.c,v 1.97 2000/02/11 05:57:58 itojun Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -488,7 +488,19 @@ ip_input(struct mbuf *m)
 	/*
 	 * Check our list of addresses, to see if the packet is for us.
 	 */
-	INADDR_TO_IA(ip->ip_dst, ia);
+	for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
+	     ia != NULL;
+	     ia = ia->ia_hash.le_next) {
+		if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
+			if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
+				break;
+			else {
+				icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST,
+				    0, m->m_pkthdr.rcvif);
+				return;
+			}
+		}
+	}
 	if (ia != NULL)
 		goto ours;
 	if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {