[src/netbsd-1-5]: src/sys/netinet6 pullup 1.32 -> 1.33 (approved by releng-1-5)

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

details:   https://anonhg.NetBSD.org/src/rev/c26048a6c0c5
branches:  netbsd-1-5
changeset: 488493:c26048a6c0c5
user:      itojun <itojun%NetBSD.org@localhost>
date:      Thu Jul 13 14:59:50 2000 +0000

description:
pullup 1.32 -> 1.33 (approved by releng-1-5)

fatal bug fix from kame (rtentry refcnt goes negative if we play with IPv6
address/routing table too much).

in6_ifloop_request()
  not to request rtrequest to return an rtentry except for the ADD
  operation, in order to avoid misdecreasing the refcnt (which might
  cause leak of rtentry)

diffstat:

 sys/netinet6/in6.c |  16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

diffs (40 lines):

diff -r 66baa1347cb3 -r c26048a6c0c5 sys/netinet6/in6.c
--- a/sys/netinet6/in6.c        Thu Jul 13 14:08:45 2000 +0000
+++ b/sys/netinet6/in6.c        Thu Jul 13 14:59:50 2000 +0000
@@ -1,5 +1,5 @@
-/*     $NetBSD: in6.c,v 1.32 2000/04/27 16:44:19 itojun Exp $  */
-/*     $KAME: in6.c,v 1.75 2000/04/12 03:51:29 itojun Exp $    */
+/*     $NetBSD: in6.c,v 1.32.4.1 2000/07/13 14:59:50 itojun Exp $      */
+/*     $KAME: in6.c,v 1.99 2000/07/11 17:00:58 jinmei Exp $    */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -174,7 +174,7 @@
 {
        struct sockaddr_in6 lo_sa;
        struct sockaddr_in6 all1_sa;
-       struct rtentry *nrt = NULL;
+       struct rtentry *nrt = NULL, **nrtp = NULL;
        
        bzero(&lo_sa, sizeof(lo_sa));
        bzero(&all1_sa, sizeof(all1_sa));
@@ -184,11 +184,17 @@
        lo_sa.sin6_addr = in6addr_loopback;
        all1_sa.sin6_addr = in6mask128;
        
-       /* So we add or remove static loopback entry, here. */
+       /*
+        * So we add or remove static loopback entry, here.
+        * This request for deletion could fail, e.g. when we remove
+        * an address right after adding it.
+        */
+       if (cmd == RTM_ADD)
+               nrtp = &nrt;
        rtrequest(cmd, ifa->ifa_addr,
                  (struct sockaddr *)&lo_sa,
                  (struct sockaddr *)&all1_sa,
-                 RTF_UP|RTF_HOST, &nrt);
+                 RTF_UP|RTF_HOST, nrtp);
 
        /*
         * Make sure rt_ifa be equal to IFA, the second argument of the