bonding: disallow setting nested bonding + ipsec offload

stable inclusion
from stable-5.10.54
commit b3bd1f5e503716e09610e49bdccc36ed9356d27c
bugzilla: 175586 https://gitee.com/openeuler/kernel/issues/I4DVDU

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b3bd1f5e503716e09610e49bdccc36ed9356d27c

--------------------------------

[ Upstream commit b1216933 ]

bonding interface can be nested and it supports ipsec offload.
So, it allows setting the nested bonding + ipsec scenario.
But code does not support this scenario.
So, it should be disallowed.

interface graph:
bond2
   |
bond1
   |
eth0

The nested bonding + ipsec offload may not a real usecase.
So, disallowing this scenario is fine.

Fixes: 18cb261a ("bonding: support hardware encryption offload to slaves")
Signed-off-by: NTaehee Yoo <ap420073@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/net/bonding/bond_main.c

@@ -403,8 +403,9 @@ static int bond_ipsec_add_sa(struct xfrm_state *xs)
 	xs->xso.real_dev = slave->dev;
 	bond->xs = xs;
 
-	if (!(slave->dev->xfrmdev_ops
-	      && slave->dev->xfrmdev_ops->xdo_dev_state_add)) {
+	if (!slave->dev->xfrmdev_ops ||
+	    !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
+	    netif_is_bond_master(slave->dev)) {
 		slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
 		rcu_read_unlock();
 		return -EINVAL;
@@ -437,8 +438,9 @@ static void bond_ipsec_del_sa(struct xfrm_state *xs)
 
 	xs->xso.real_dev = slave->dev;
 
-	if (!(slave->dev->xfrmdev_ops
-	      && slave->dev->xfrmdev_ops->xdo_dev_state_delete)) {
+	if (!slave->dev->xfrmdev_ops ||
+	    !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
+	    netif_is_bond_master(slave->dev)) {
 		slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 		goto out;
 	}
@@ -463,8 +465,9 @@ static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 	if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
 		return true;
 
-	if (!(slave_dev->xfrmdev_ops
-	      && slave_dev->xfrmdev_ops->xdo_dev_offload_ok)) {
+	if (!slave_dev->xfrmdev_ops ||
+	    !slave_dev->xfrmdev_ops->xdo_dev_offload_ok ||
+	    netif_is_bond_master(slave_dev)) {
 		slave_warn(bond_dev, slave_dev, "%s: no slave xdo_dev_offload_ok\n", __func__);
 		return false;
 	}