[PATCH net 3/3] mpls: Return error for RTA_GATEWAY attribute

[David Ahern]

From: David Ahern <dsah...@gmail.com>

MPLS does not support nexthops with an MPLS address family.
Specifically, it does not handle RTA_GATEWAY attribute. Make it
clear by returning an error.

Fixes: 03c0566542f4c ("mpls: Netlink commands to add, remove, and dump routes")
Signed-off-by: David Ahern <dsah...@gmail.com>
---
 net/mpls/af_mpls.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 7d55d4c04088..fa763e2e50ec 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -1838,6 +1838,9 @@ static int rtm_to_route_config(struct sk_buff *skb,
                                goto errout;
                        break;
                }
+               case RTA_GATEWAY:
+                       NL_SET_ERR_MSG(extack, "MPLS does not support 
RTA_GATEWAY attribute");
+                       goto errout;
                case RTA_VIA:
                {
                        if (nla_get_via(nla, &cfg->rc_via_alen,
-- 
2.11.0