* [PATCH net] ipv6: Allow IPv4-mapped address as next-hop
[not found] <20161128181000.CED72D3427AA@us153.sjc.aristanetworks.com>
@ 2016-11-28 23:27 ` Erik Nordmark
2016-11-30 15:58 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Erik Nordmark @ 2016-11-28 23:27 UTC (permalink / raw)
To: David S. Miller, Alexey Kuznetsov, James Morris,
Hideaki YOSHIFUJI, Patrick McHardy
Cc: netdev, Bob Gilligan
Made kernel accept IPv6 routes with IPv4-mapped address as next-hop.
It is possible to configure IP interfaces with IPv4-mapped addresses, and
one can add IPv6 routes for IPv4-mapped destinations/prefixes, yet prior
to this fix the kernel returned an EINVAL when attempting to add an IPv6
route with an IPv4-mapped address as a nexthop/gateway.
RFC 4798 (a proposed standard RFC) uses IPv4-mapped addresses as nexthops,
thus in order to support that type of address configuration the kernel
needs to allow IPv4-mapped addresses as nexthops.
Signed-off-by: Erik Nordmark <nordmark@arista.com>
Signed-off-by: Bob Gilligan <gilligan@arista.com>"
Index: net/net/ipv6/route.c
===================================================================
--- net.orig/net/ipv6/route.c
+++ net/net/ipv6/route.c
@@ -1995,8 +1995,11 @@ static struct rt6_info *ip6_route_info_c
It is very good, but in some (rare!) circumstances
(SIT, PtP, NBMA NOARP links) it is handy to allow
some exceptions. --ANK
+ We allow IPv4-mapped nexthops to support RFC4798-type
+ addressing
*/
- if (!(gwa_type & IPV6_ADDR_UNICAST))
+ if (!(gwa_type & (IPV6_ADDR_UNICAST |
+ IPV6_ADDR_MAPPED)))
goto out;
if (cfg->fc_table) {
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