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authorFX Le Bail <fx.lebail@yahoo.com>2014-01-07 17:57:27 +0400
committerDavid S. Miller <davem@davemloft.net>2014-01-08 00:51:39 +0400
commit509aba3b0d366b7f16a9a2eebac1156b25f5f622 (patch)
tree703f6a9807c1cc5f2ae451831f4ffe7eb2861baf /include/net/netns
parent9ba75fb0c4b92416b94640b5a043c323a457f14a (diff)
downloadlinux-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.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 0fb2401197c5..76fc7d1dbfd3 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)