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authorFlorian Westphal <fw@strlen.de>2015-05-21 00:25:41 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-21 23:23:38 -0400
commit48ed7b26faa758e6612cd1fb11c07f25cd54f771 (patch)
tree0e814f2067f2c93abdcab8eb60412ed1fe03fb2a /net/ipv6
parentb66ba8d5a4d7ebcd140de808574c4c93fc71acaf (diff)
ipv6: reject locally assigned nexthop addresses
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>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/route.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 6f4a35096bde..98fce6f4a580 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -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;

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