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ipv4: Return error for RTA_VIA attribute

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[ Upstream commit b6e9e5df4ecf100f6a10ab2ade8e46d47a4b9779 ]

IPv4 currently does not support nexthops outside of the AF_INET family.
Specifically, it does not handle RTA_VIA attribute. If it is passed
in a route add request, the actual route added only uses the device
which is clearly not what the user intended:

  $ ip ro add 172.16.1.0/24 via inet6 2001:db8:1::1 dev eth0
  $ ip ro ls
  ...
  172.16.1.0/24 dev eth0

Catch this and fail the route add:
  $ ip ro add 172.16.1.0/24 via inet6 2001:db8:1::1 dev eth0
  Error: IPv4 does not support RTA_VIA attribute.

Fixes: 03c0566542f4c ("mpls: Netlink commands to add, remove, and dump routes")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Ahern 2019-02-26 09:00:02 -08:00 committed by Greg Kroah-Hartman
parent 980a71678e
commit 987e2bfbf8
1 changed files with 4 additions and 0 deletions
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4
net/ipv4/fib_frontend.c
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@ -675,6 +675,10 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
case RTA_GATEWAY:
cfg->fc_gw = nla_get_be32(attr);
break;
case RTA_VIA:
NL_SET_ERR_MSG(extack, "IPv4 does not support RTA_VIA attribute");
err = -EINVAL;
goto errout;
case RTA_PRIORITY:
cfg->fc_priority = nla_get_u32(attr);
break;