netdev - [PATCHv4 net-next 1/3] bonding: add common function to check ipsec device

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Message-ID: <20240821105003.547460-2-liuhangbin@gmail.com>
Date: Wed, 21 Aug 2024 18:50:01 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: netdev@...r.kernel.org
Cc: Jay Vosburgh <j.vosburgh@...il.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Tariq Toukan <tariqt@...dia.com>,
	Jianbo Liu <jianbol@...dia.com>,
	Sabrina Dubroca <sd@...asysnail.net>,
	Simon Horman <horms@...nel.org>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCHv4 net-next 1/3] bonding: add common function to check ipsec device

This patch adds a common function to check the status of IPSec devices.
This function will be useful for future implementations, such as IPSec ESN
and state offload callbacks.

Suggested-by: Nikolay Aleksandrov <razor@...ckwall.org>
Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 drivers/net/bonding/bond_main.c | 47 ++++++++++++++++++++++++---------
 1 file changed, 34 insertions(+), 13 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index f9633a6f8571..fe10ac66f26e 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -418,6 +418,38 @@ static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 /*---------------------------------- XFRM -----------------------------------*/
 
 #ifdef CONFIG_XFRM_OFFLOAD
+/**
+ * bond_ipsec_dev - return the device for ipsec offload, or NULL if not exist
+ *                  caller must hold rcu_read_lock.
+ * @xs: pointer to transformer state struct
+ **/
+static struct net_device *bond_ipsec_dev(struct xfrm_state *xs)
+{
+	struct net_device *bond_dev = xs->xso.dev;
+	struct bonding *bond;
+	struct slave *slave;
+
+	if (!bond_dev)
+		return NULL;
+
+	bond = netdev_priv(bond_dev);
+	if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
+		return NULL;
+
+	slave = rcu_dereference(bond->curr_active_slave);
+	if (!slave)
+		return NULL;
+
+	if (!xs->xso.real_dev)
+		return NULL;
+
+	if (xs->xso.real_dev != slave->dev)
+		pr_warn_ratelimited("%s: (slave %s): not same with IPsec offload real dev %s\n",
+				    bond_dev->name, slave->dev->name, xs->xso.real_dev->name);
+
+	return slave->dev;
+}
+
 /**
  * bond_ipsec_add_sa - program device with a security association
  * @xs: pointer to transformer state struct
@@ -595,23 +627,12 @@ static void bond_ipsec_del_sa_all(struct bonding *bond)
  **/
 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 {
-	struct net_device *bond_dev = xs->xso.dev;
 	struct net_device *real_dev;
-	struct slave *curr_active;
-	struct bonding *bond;
 	int err;
 
-	bond = netdev_priv(bond_dev);
 	rcu_read_lock();
-	curr_active = rcu_dereference(bond->curr_active_slave);
-	real_dev = curr_active->dev;
-
-	if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
-		err = false;
-		goto out;
-	}
-
-	if (!xs->xso.real_dev) {
+	real_dev = bond_ipsec_dev(xs);
+	if (!real_dev) {
 		err = false;
 		goto out;
 	}
-- 
2.45.0