From: Ido Schimmel <idosch@mellanox.com>
Date: Thu, 3 Aug 2017 13:28:30 +0200
Subject: mlxsw: spectrum_router: Abort on source-specific routes
Patch-mainline: v4.14-rc1
Git-commit: f36f5ac677d184a62404169c781339c0cc64ea87
References: bsc#1112374

Without resorting to ACLs, the device performs route lookup solely based
on the destination IP address.

In case source-specific routing is needed, an error is returned and the
abort mechanism is activated, thus allowing the kernel to take over
forwarding decisions.

Instead of aborting, we can trap specific destination prefixes where
source-specific routes are present, but this will result in a lot more
code that is unlikely to ever be used.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -3528,6 +3528,9 @@ static int mlxsw_sp_router_fib6_add(stru
 	if (mlxsw_sp->router->aborted)
 		return 0;
 
+	if (rt->rt6i_src.plen)
+		return -EINVAL;
+
 	if (mlxsw_sp_fib6_rt_should_ignore(rt))
 		return 0;