Date: Wed, 27 Mar 2002 16:23:20 +0900 (JST) From: Keiichi SHIMA / =?iso-2022-jp?B?GyRCRWc3RDBsGyhC?= <keiichi@iij.ad.jp> To: freebsd-net@FreeBSD.ORG Subject: Re: problems with udp46 sockets Message-ID: <20020327.162320.922733592.keiichi@iij.ad.jp> In-Reply-To: <20020326231734.H58573@Space.Net> References: <20020326231734.H58573@Space.Net>
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Hi,
From: Markus Stumpf <maex-lists-freebsd-net@Space.Net>
> I am trying to get dnscache running with IPv6 patches.
> dnscache binds to the IPv6 unqualified address "::". This works fine
> and I get (from netstat)
> udp46 0 0 *.53 *.*
> As the sending address the IPv6 unqualified address "::" is used, also.
>
> As long as I only send queries via either IPv6 or IPv4 all works well, but
> all subsequent queries via IPv6 after one or more queries via
> IPv4 fail. The queries arrive properly, but sending the answer fails.
>
> >From truss I can see for that IPv6 answers:
> sendto(0x3,0x80f34e0,0x55,0x0,0xbfbffbd0,0x1c) ERR#65 'No route to host'
> for all queries via IPv6, queries via IPv4 still work without problems.
> It doesn't matter if I use different source hosts for the queries via IPv6,
> it fails for all of them.
This is a cached route problem. struct inpcb has a route entry for
cached route. Since inpcb is shared by both IPv4 and IPv6, the cached
route entry is also shared by them. 4.5-STABLE doesn't check the
protocol family of the cached route when using it. Therefore, once a
IPv4 route is cached, ip6_output mistakingly use it as a cached route
for IPv6 destination.
Please try attached patches.
---
Keiichi SHIMA
IIJ Research Laboratory <keiichi@iij.ad.jp>
KAME Project <keiichi@kame.net>
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--- ip_output.c.orig Wed Mar 27 14:29:43 2002
+++ ip_output.c Wed Mar 27 13:54:40 2002
@@ -219,6 +219,7 @@
* and is still up. If not, free it and try again.
*/
if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
+ dst->sin_family != AF_INET ||
dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
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Content-Disposition: inline; filename="ip6_output.c.diff"
--- ip6_output.c.orig Wed Mar 27 14:23:54 2002
+++ ip6_output.c Wed Mar 27 14:08:22 2002
@@ -461,6 +461,7 @@
* and is still up. If not, free it and try again.
*/
if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
+ dst->sin6_family != AF_INET6 ||
!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) {
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
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Content-Disposition: inline; filename="in6_src.c.diff"
--- in6_src.c.orig Wed Mar 27 14:24:28 2002
+++ in6_src.c Wed Mar 27 14:47:31 2002
@@ -239,7 +239,9 @@
*/
if (ro) {
if (ro->ro_rt &&
- !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
+ (!(ro->ro_rt->rt_flags & RTF_UP) ||
+ ro->ro_dst.sin6_family != AF_INET6 ||
+ !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst))) {
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
}
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