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author | FX Le Bail <fx.lebail@yahoo.com> | 2014-01-07 13:57:27 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2014-01-07 20:51:39 (GMT) |
commit | 509aba3b0d366b7f16a9a2eebac1156b25f5f622 (patch) | |
tree | 703f6a9807c1cc5f2ae451831f4ffe7eb2861baf /include/net/netns | |
parent | 9ba75fb0c4b92416b94640b5a043c323a457f14a (diff) | |
download | linux-509aba3b0d366b7f16a9a2eebac1156b25f5f622.tar.xz |
IPv6: add the option to use anycast addresses as source addresses in echo reply
This change allows to follow a recommandation of RFC4942.
- Add "anycast_src_echo_reply" sysctl to control the use of anycast addresses
as source addresses for ICMPv6 echo reply. This sysctl is false by default
to preserve existing behavior.
- Add inline check ipv6_anycast_destination().
- Use them in icmpv6_echo_reply().
Reference:
RFC4942 - IPv6 Transition/Coexistence Security Considerations
(http://tools.ietf.org/html/rfc4942#section-2.1.6)
2.1.6. Anycast Traffic Identification and Security
[...]
To avoid exposing knowledge about the internal structure of the
network, it is recommended that anycast servers now take advantage of
the ability to return responses with the anycast address as the
source address if possible.
Signed-off-by: Francois-Xavier Le Bail <fx.lebail@yahoo.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/netns')
-rw-r--r-- | include/net/netns/ipv6.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h index 0fb2401..76fc7d1 100644 --- a/include/net/netns/ipv6.h +++ b/include/net/netns/ipv6.h @@ -73,6 +73,7 @@ struct netns_ipv6 { #endif atomic_t dev_addr_genid; atomic_t rt_genid; + int anycast_src_echo_reply; }; #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |