Nicolas DICHTEL wrote:
> Hello,
>
> Suppose that a host has autoconfiguration enabled. It will take RA to
> autoconfigure an IPv6 address. For example,
> 2001:0db8:3008:c1ca:2d0:b7ff:febb:4aee/64.
> This host will create a route entry for this onlink prefix (dst:
> 2001:0db8:3008:c1ca::/64)
> in the MAIN table with the lifetime present in prefix option in RA.
> Each time this host will receive a RA, it will update this lifetime. To
> do this,
> it will call rt6_lookup() (in addrconf_prefix_rcv()) to find the entry.
>
> Now, suppose that our host joins this anycast group:
> "2001:0db8:3008:c1ca::0". A route
Hmm... you are configuring a subnet router anycast address on host and
the implementation lets you do it? That's not good. I don't think
you sould be permitted to configure a subnet router anycast address
on a host that autoconfigures it's interface.
-vlad
> entry will be added in the LOCAL table (see addrconf_join_anycast()).
> Problem is that, next time our host will receive a RA and will perform a
> rt6_lookup(),
> this function will return the local entry (LOCAL table), and not the
> "dynamic" entry
> (MAIN table). Consequence is that the lifetime of the dynamic entry will
> never been updated,
> and so will expire, whereas the host will keep the corresponding address.
>
> Maybe, when strict is set to 1 in rt6_lookup(), kernel must not return
> an anycast route.
> What about this patch ?
>
>
> Regards,
> Nicolas
>
> [IPv6] Don't return anycast route when strict is enable
>
> Signed-off-by: Nicolas DICHTEL <[EMAIL PROTECTED]>
>
>
> ------------------------------------------------------------------------
>
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index c953466..51a8c1d 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -248,6 +248,8 @@ static __inline__ struct rt6_info *rt6_d
> if (dev->ifindex == oif)
> return sprt;
> if (dev->flags & IFF_LOOPBACK) {
> + if (strict && sprt->rt6i_flags & RTF_ANYCAST)
> + continue;
> if (sprt->rt6i_idev == NULL ||
> sprt->rt6i_idev->dev->ifindex != oif) {
> if (strict && oif)
-
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