IPv6 and rt6_lookup()
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
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)
Re: IPv6 and rt6_lookup()
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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Re: IPv6 and rt6_lookup()
Le 02.11.2006 18:02, Vlad Yasevich a écrit : 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. The current implementation allow this and I don't know if we must prohibit this. For example, in case of NEMO (RFC3963), router may autoconfigured its address. Nicolas - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
