netdev - [PATCH net-next 2/2] mlxsw: spectrum_router: Relax FIB rule validation

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Date:   Sun, 21 Apr 2019 07:18:36 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>, mlxsw <mlxsw@...lanox.com>,
        "dsahern@...il.com" <dsahern@...il.com>,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 2/2] mlxsw: spectrum_router: Relax FIB rule
 validation

Currently, mlxsw does not support policy-based routing (PBR) and
therefore forbids the installation of non-default FIB rules except for
the l3mdev rule which is used for VRFs.

Relax the check to allow the installation of FIB rules that would never
match packets received by the device. Specifically, if the iif is that
of the loopback netdev. This is useful for users that need to redirect
locally generated packets based on FIB rules.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
Tested-by: Alexander Petrovskiy <alexpe@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 6c73400b1508..8f31c2ddc538 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -6050,6 +6050,10 @@ static int mlxsw_sp_router_fib_rule_event(unsigned long event,
 	fr_info = container_of(info, struct fib_rule_notifier_info, info);
 	rule = fr_info->rule;
 
+	/* Rule only affects locally generated traffic */
+	if (rule->iifindex == info->net->loopback_dev->ifindex)
+		return 0;
+
 	switch (info->family) {
 	case AF_INET:
 		if (!fib4_rule_default(rule) && !rule->l3mdev)
-- 
2.20.1