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ipv6: reject locally assigned nexthop addresses

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ip -6 addr add dead::1/128 dev eth0
sleep 5
ip -6 route add default via dead::1/128
-> fails
ip -6 addr add dead::1/128 dev eth0
ip -6 route add default via dead::1/128
-> succeeds

reason is that if (nonsensensical) route above is added,
dead::1 is still subject to DAD, so the route lookup will
pick eth0 as outdev due to the prefix route that is added before
DAD work is started.

Add explicit test that checks if nexthop gateway is a local address.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1167969
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2015-05-21 00:25:41 +02:00 committed by David S. Miller
parent b66ba8d5a4
commit 48ed7b26fa
1 changed files with 10 additions and 1 deletions
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11
net/ipv6/route.c
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@ -1624,6 +1624,16 @@ int ip6_route_add(struct fib6_config *cfg)
int gwa_type;
gw_addr = &cfg->fc_gateway;
/* if gw_addr is local we will fail to detect this in case
* address is still TENTATIVE (DAD in progress). rt6_lookup()
* will return already-added prefix route via interface that
* prefix route was assigned to, which might be non-loopback.
*/
err = -EINVAL;
if (ipv6_chk_addr_and_flags(net, gw_addr, NULL, 0, 0))
goto out;
rt->rt6i_gateway = *gw_addr;
gwa_type = ipv6_addr_type(gw_addr);
@ -1637,7 +1647,6 @@ int ip6_route_add(struct fib6_config *cfg)
(SIT, PtP, NBMA NOARP links) it is handy to allow
some exceptions. --ANK
*/
err = -EINVAL;
if (!(gwa_type & IPV6_ADDR_UNICAST))
goto out;