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ipv6: don't reject link-local nexthop on other interface

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48ed7b26fa ("ipv6: reject locally assigned nexthop addresses") is too
strict; it rejects following corner-case:

ip -6 route add default via fe80::1:2:3 dev eth1

[ where fe80::1:2:3 is assigned to a local interface, but not eth1 ]

Fix this by restricting search to given device if nh is linklocal.

Joint work with Hannes Frederic Sowa.

Fixes: 48ed7b26fa ("ipv6: reject locally assigned nexthop addresses")
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2015-08-07 10:54:28 +02:00 committed by David S. Miller
parent 4e7c133068
commit 330567b71d
1 changed files with 4 additions and 2 deletions
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6
net/ipv6/route.c
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@ -1831,6 +1831,7 @@ int ip6_route_add(struct fib6_config *cfg)
int gwa_type;
gw_addr = &cfg->fc_gateway;
gwa_type = ipv6_addr_type(gw_addr);
/* if gw_addr is local we will fail to detect this in case
* address is still TENTATIVE (DAD in progress). rt6_lookup()
@ -1838,11 +1839,12 @@ int ip6_route_add(struct fib6_config *cfg)
* prefix route was assigned to, which might be non-loopback.
*/
err = -EINVAL;
if (ipv6_chk_addr_and_flags(net, gw_addr, NULL, 0, 0))
if (ipv6_chk_addr_and_flags(net, gw_addr,
gwa_type & IPV6_ADDR_LINKLOCAL ?
dev : NULL, 0, 0))
goto out;
rt->rt6i_gateway = *gw_addr;
gwa_type = ipv6_addr_type(gw_addr);
if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
struct rt6_info *grt;