netdev - [PATCH net-next 06/13] vxlan: changelink: Postpone vxlan_config

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <dc5de69833ae50b30704d01b3092d5817ac21ab9.1547679599.git.petrm@mellanox.com>
Date:   Wed, 16 Jan 2019 23:06:41 +0000
From:   Petr Machata <petrm@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "ivecera@...hat.com" <ivecera@...hat.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: [PATCH net-next 06/13] vxlan: changelink: Postpone
 vxlan_config_apply()

When an FDB entry is vetoed, it is necessary to unroll the changes that
have already been done. To avoid having to unroll vxlan_config_apply(),
postpone the call after the point where the vetoing takes place. Since
the call can't fail, it doesn't necessitate any cleanups in the
preceding FDB update logic.

Correspondingly, move down the mod_timer() call as well.

References to *dst need to be replaced with references to conf.
Additionally, old_dst and old_age_interval are not necessary anymore,
and therefore drop them.

Signed-off-by: Petr Machata <petrm@...lanox.com>
---
 drivers/net/vxlan.c | 35 ++++++++++++++---------------------
 1 file changed, 14 insertions(+), 21 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index f2f419c60dfe..51e10f47d4f1 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -3792,9 +3792,7 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct vxlan_rdst *dst = &vxlan->default_dst;
-	unsigned long old_age_interval;
 	struct net_device *lowerdev;
-	struct vxlan_rdst old_dst;
 	struct vxlan_config conf;
 	int err;
 
@@ -3803,40 +3801,31 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
 	if (err)
 		return err;
 
-	old_age_interval = vxlan->cfg.age_interval;
-	memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
-
 	err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
 				    vxlan, extack);
 	if (err)
 		return err;
 
-	vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
-
-	if (old_age_interval != vxlan->cfg.age_interval)
-		mod_timer(&vxlan->age_timer, jiffies);
-
 	/* handle default dst entry */
-	if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
+	if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
 		spin_lock_bh(&vxlan->hash_lock);
-		if (!vxlan_addr_any(&old_dst.remote_ip))
+		if (!vxlan_addr_any(&dst->remote_ip))
 			__vxlan_fdb_delete(vxlan, all_zeros_mac,
-					   old_dst.remote_ip,
+					   dst->remote_ip,
 					   vxlan->cfg.dst_port,
-					   old_dst.remote_vni,
-					   old_dst.remote_vni,
-					   old_dst.remote_ifindex,
+					   dst->remote_vni,
+					   dst->remote_vni,
+					   dst->remote_ifindex,
 					   true);
 
-		if (!vxlan_addr_any(&dst->remote_ip)) {
+		if (!vxlan_addr_any(&conf.remote_ip)) {
 			err = vxlan_fdb_update(vxlan, all_zeros_mac,
-					       &dst->remote_ip,
+					       &conf.remote_ip,
 					       NUD_REACHABLE | NUD_PERMANENT,
 					       NLM_F_APPEND | NLM_F_CREATE,
 					       vxlan->cfg.dst_port,
-					       dst->remote_vni,
-					       dst->remote_vni,
-					       dst->remote_ifindex,
+					       conf.vni, conf.vni,
+					       conf.remote_ifindex,
 					       NTF_SELF, true);
 			if (err) {
 				spin_unlock_bh(&vxlan->hash_lock);
@@ -3846,6 +3835,10 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
 		spin_unlock_bh(&vxlan->hash_lock);
 	}
 
+	if (conf.age_interval != vxlan->cfg.age_interval)
+		mod_timer(&vxlan->age_timer, jiffies);
+
+	vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
 	return 0;
 }
 
-- 
2.4.11