netdev - [PATCH net-next] mlxsw: spectrum_router: Do not allow ipv6 gateway with v4 route via replace

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Message-Id: <20190422224214.17245-1-dsahern@kernel.org>
Date:   Mon, 22 Apr 2019 15:42:14 -0700
From:   David Ahern <dsahern@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, idosch@...lanox.com,
        David Ahern <dsahern@...il.com>
Subject: [PATCH net-next] mlxsw: spectrum_router: Do not allow ipv6 gateway with v4 route via replace

From: David Ahern <dsahern@...il.com>

mlxsw currently does not support v6 gateways with v4 routes. Commit
19a9d136f198 ("ipv4: Flag fib_info with a fib_nh using IPv6 gateway")
prevents a route from being added, but nothing stops the replace. Add
a catch for it too.
    $ ip  ro add 172.16.2.0/24 via 10.99.1.2
    $ ip  ro replace 172.16.2.0/24 via inet6 fe80::202:ff:fe00:b dev swp1s0
    Error: mlxsw_spectrum: IPv6 gateway with IPv4 route is not supported.

Signed-off-by: David Ahern <dsahern@...il.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 34d9053e5cf0..d21b73236971 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -6109,6 +6109,8 @@ static int mlxsw_sp_router_fib_event(struct notifier_block *nb,
 			NL_SET_ERR_MSG_MOD(info->extack, "FIB offload was aborted. Not configuring route");
 			return notifier_from_errno(-EINVAL);
 		}
+		/* fall through */
+	case FIB_EVENT_ENTRY_REPLACE:
 		if (info->family == AF_INET) {
 			struct fib_entry_notifier_info *fen_info = ptr;
 
-- 
2.11.0