Date: Thu, 26 Oct 2006 09:52:09 +0300 From: Jan Mikael Melen <jan@melen.org> To: freebsd-hackers@freebsd.org, freebsd-net@freebsd.org Subject: Re: Problem with routes when configuring IPv6 addresses Message-ID: <200610260952.10413.jan@melen.org> In-Reply-To: <200608092157.07573.jan@melen.org> References: <200608092157.07573.jan@melen.org>
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Hi,
Just answering my own mail. Here is small patch that fixes this problem for us
in 6.1.
--- nd6_rtr.c.orig Mon Mar 20 18:23:08 2006
+++ nd6_rtr.c Thu Oct 26 09:48:59 2006
@@ -1409,12 +1409,20 @@
if (pr->ndpr_raf_onlink == 0)
continue;
- if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
+ /* For some reason nd6 tries to find a active
+ * advertising router also for prefixes that are
+ * statically configured which shouldn't be the case
+ */
+ if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME) {
+ pr->ndpr_stateflags &= ~NDPRF_DETACHED;
+ } else {
+ if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
find_pfxlist_reachable_router(pr) == NULL)
pr->ndpr_stateflags |= NDPRF_DETACHED;
if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
find_pfxlist_reachable_router(pr) != 0)
pr->ndpr_stateflags &= ~NDPRF_DETACHED;
+ }
}
} else {
/* there is no prefix that has a reachable router */
On Wednesday 09 August 2006 21:57, Jan Mikael Melen wrote:
> Hello,
>
> I previously already sent this to the freebsd-net list but didn't get any
> response so let's try the hackers list instead.
>
> I have a problem with routes in 6.1 when configuring IPv6 address using
> both autoconfigured addresses at the same time with statically configured
> addresses from different prefixes.
>
> If the host is not accepting router advertisements everything seems to work
> fine:
> # sysctl -a | grep rtad
> net.inet6.ip6.accept_rtadv: 0
> # ifconfig fxp0 inet6 3ffe:101::1 prefixlen 64
>
> # netstat -rn -f inet6 | grep 3ffe:101
> 3ffe:101::/64 link#1 UC
> fxp0
> 3ffe:101::1 00:12:3f:71:3e:ef UHL
> lo0
> #
>
> As you can see I have two routes one for the loopback and one for the
> prefix as it should GREAT!
>
> Now if I'll set the host to accept router advertisements then the route for
> the 3ffe:101:: prefix will be deleted as the first router advertisement is
> received. The router advertises prefix 3ffe:14b8:400:101::/64.
>
> # sysctl net.inet6.ip6.accept_rtadv=1
> net.inet6.ip6.accept_rtadv: 0 -> 1
> # rtsol -a
> # netstat -rn -f inet6 | grep 3ffe:101
> 3ffe:101::1 00:12:3f:71:3e:ef UHL
> lo0
> #
>
> It seems that the route is deleted because in function
> pfxlist_onlink_check() there is a check that if the state has changed to
> DETACHED the
> nd6_prefix_offlink will be called which then removes the route:
> if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
> (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
> if ((e = nd6_prefix_offlink(pr)) != 0) {
> nd6log((LOG_ERR,
> "pfxlist_onlink_check: failed to "
> "make %s/%d offlink, errno=%d\n",
> ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
> pr->ndpr_plen, e));
> }
> }
>
> This far I digged in to the code but then ran out of steam :-( Obviously
> the state should not be set to DETACHED for manually configured prefixes
> but the question is rather where it should be done.
>
> Before somebody asks, if I first do the autoconfiguration part and then
> after I have the autoconfigured address add the manually configured address
> the result is that there wont be any route for the manually configured
> prefix (3ffe:101::/64).
>
> Regards,
> Jan
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