Re: [PATCH 6/7] net: core: Convert dev_set_mac_address() to struct sockaddr_storage

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On 20/05/25 16:31, Kees Cook wrote:
All users of dev_set_mac_address() are now using a struct sockaddr_storage.
Convert the internal data type to struct sockaddr_storage, drop the casts,
and update pointer types.

Signed-off-by: Kees Cook <kees@xxxxxxxxxx>

Acked-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>

Thanks!
-Gustavo

---
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Jay Vosburgh <jv@xxxxxxxxxxxxx>
Cc: Andrew Lunn <andrew+netdev@xxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Paolo Abeni <pabeni@xxxxxxxxxx>
Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu@xxxxxxxxxx>
Cc: Dexuan Cui <decui@xxxxxxxxxxxxx>
Cc: Jiri Pirko <jiri@xxxxxxxxxxx>
Cc: Simon Horman <horms@xxxxxxxxxx>
Cc: Alexander Aring <alex.aring@xxxxxxxxx>
Cc: Stefan Schmidt <stefan@xxxxxxxxxxxxxxxxxx>
Cc: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Cc: Samuel Mendoza-Jonas <sam@xxxxxxxxxxxxxxxx>
Cc: Paul Fertser <fercerpav@xxxxxxxxx>
Cc: Hayes Wang <hayeswang@xxxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Grant Grundler <grundler@xxxxxxxxxxxx>
Cc: Stanislav Fomichev <sdf@xxxxxxxxxxx>
Cc: Cosmin Ratiu <cratiu@xxxxxxxxxx>
Cc: Lei Yang <leiyang@xxxxxxxxxx>
Cc: <netdev@xxxxxxxxxxxxxxx>
Cc: <linux-hyperv@xxxxxxxxxxxxxxx>
Cc: <linux-usb@xxxxxxxxxxxxxxx>
Cc: <linux-wpan@xxxxxxxxxxxxxxx>
---
  include/linux/netdevice.h       |  2 +-
  drivers/net/bonding/bond_alb.c  |  8 +++-----
  drivers/net/bonding/bond_main.c | 10 ++++------
  drivers/net/hyperv/netvsc_drv.c |  6 +++---
  drivers/net/macvlan.c           | 10 +++++-----
  drivers/net/team/team_core.c    |  2 +-
  drivers/net/usb/r8152.c         |  2 +-
  net/core/dev.c                  |  1 +
  net/core/dev_api.c              |  6 +++---
  net/ieee802154/nl-phy.c         |  2 +-
  net/ncsi/ncsi-manage.c          |  2 +-
  11 files changed, 24 insertions(+), 27 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 47200a394a02..b4242b997373 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4214,7 +4214,7 @@ int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr,
  			      struct netlink_ext_ack *extack);
  int netif_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,
  			  struct netlink_ext_ack *extack);
-int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
+int dev_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,
  			struct netlink_ext_ack *extack);
  int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
  			     struct netlink_ext_ack *extack);
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 7edf0fd58c34..2d37b07c8215 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -1035,7 +1035,7 @@ static int alb_set_slave_mac_addr(struct slave *slave, const u8 addr[],
  	 */
  	memcpy(ss.__data, addr, len);
  	ss.ss_family = dev->type;
-	if (dev_set_mac_address(dev, (struct sockaddr *)&ss, NULL)) {
+	if (dev_set_mac_address(dev, &ss, NULL)) {
  		slave_err(slave->bond->dev, dev, "dev_set_mac_address on slave failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n");
  		return -EOPNOTSUPP;
  	}
@@ -1273,8 +1273,7 @@ static int alb_set_mac_address(struct bonding *bond, void *addr)
  			break;
  		bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr,
  				  rollback_slave->dev->addr_len);
-		dev_set_mac_address(rollback_slave->dev,
-				    (struct sockaddr *)&ss, NULL);
+		dev_set_mac_address(rollback_slave->dev, &ss, NULL);
  		dev_addr_set(rollback_slave->dev, tmp_addr);
  	}
@@ -1763,8 +1762,7 @@ void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave
  				  bond->dev->addr_len);
  		ss.ss_family = bond->dev->type;
  		/* we don't care if it can't change its mac, best effort */
-		dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss,
-				    NULL);
+		dev_set_mac_address(new_slave->dev, &ss, NULL);
dev_addr_set(new_slave->dev, tmp_addr);
  	}
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 98cf4486fcee..b92e8935d686 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1112,8 +1112,7 @@ static void bond_do_fail_over_mac(struct bonding *bond,
  			ss.ss_family = bond->dev->type;
  		}
- rv = dev_set_mac_address(new_active->dev,
-					 (struct sockaddr *)&ss, NULL);
+		rv = dev_set_mac_address(new_active->dev, &ss, NULL);
  		if (rv) {
  			slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
  				  -rv);
@@ -1127,8 +1126,7 @@ static void bond_do_fail_over_mac(struct bonding *bond,
  				  new_active->dev->addr_len);
  		ss.ss_family = old_active->dev->type;
- rv = dev_set_mac_address(old_active->dev,
-					 (struct sockaddr *)&ss, NULL);
+		rv = dev_set_mac_address(old_active->dev, &ss, NULL);
  		if (rv)
  			slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
  				  -rv);
@@ -2455,7 +2453,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
  		bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
  				  new_slave->dev->addr_len);
  		ss.ss_family = slave_dev->type;
-		dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
+		dev_set_mac_address(slave_dev, &ss, NULL);
  	}
err_restore_mtu:
@@ -2649,7 +2647,7 @@ static int __bond_release_one(struct net_device *bond_dev,
  		bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
  				  slave->dev->addr_len);
  		ss.ss_family = slave_dev->type;
-		dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
+		dev_set_mac_address(slave_dev, &ss, NULL);
  	}
if (unregister) {
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index d8b169ac0343..14a0d04e21ae 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1371,7 +1371,7 @@ static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
  	struct net_device_context *ndc = netdev_priv(ndev);
  	struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);
  	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
-	struct sockaddr *addr = p;
+	struct sockaddr_storage *addr = p;
  	int err;
err = eth_prepare_mac_addr_change(ndev, p);
@@ -1387,12 +1387,12 @@ static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
  			return err;
  	}
- err = rndis_filter_set_device_mac(nvdev, addr->sa_data);
+	err = rndis_filter_set_device_mac(nvdev, addr->__data);
  	if (!err) {
  		eth_commit_mac_addr_change(ndev, p);
  	} else if (vf_netdev) {
  		/* rollback change on VF */
-		memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN);
+		memcpy(addr->__data, ndev->dev_addr, ETH_ALEN);
  		dev_set_mac_address(vf_netdev, addr, NULL);
  	}
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 7045b1d58754..69e879780c36 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -754,13 +754,13 @@ static int macvlan_sync_address(struct net_device *dev,
  static int macvlan_set_mac_address(struct net_device *dev, void *p)
  {
  	struct macvlan_dev *vlan = netdev_priv(dev);
-	struct sockaddr *addr = p;
+	struct sockaddr_storage *addr = p;
- if (!is_valid_ether_addr(addr->sa_data))
+	if (!is_valid_ether_addr(addr->__data))
  		return -EADDRNOTAVAIL;
/* If the addresses are the same, this is a no-op */
-	if (ether_addr_equal(dev->dev_addr, addr->sa_data))
+	if (ether_addr_equal(dev->dev_addr, addr->__data))
  		return 0;
if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
@@ -768,10 +768,10 @@ static int macvlan_set_mac_address(struct net_device *dev, void *p)
  		return dev_set_mac_address(vlan->lowerdev, addr, NULL);
  	}
- if (macvlan_addr_busy(vlan->port, addr->sa_data))
+	if (macvlan_addr_busy(vlan->port, addr->__data))
  		return -EADDRINUSE;
- return macvlan_sync_address(dev, addr->sa_data);
+	return macvlan_sync_address(dev, addr->__data);
  }
static void macvlan_change_rx_flags(struct net_device *dev, int change)
diff --git a/drivers/net/team/team_core.c b/drivers/net/team/team_core.c
index d8fc0c79745d..a64e661c21a1 100644
--- a/drivers/net/team/team_core.c
+++ b/drivers/net/team/team_core.c
@@ -55,7 +55,7 @@ static int __set_port_dev_addr(struct net_device *port_dev,
memcpy(addr.__data, dev_addr, port_dev->addr_len);
  	addr.ss_family = port_dev->type;
-	return dev_set_mac_address(port_dev, (struct sockaddr *)&addr, NULL);
+	return dev_set_mac_address(port_dev, &addr, NULL);
  }
static int team_port_set_orig_dev_addr(struct team_port *port)
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index b18dee1b1bb3..d6589b24c68d 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -8432,7 +8432,7 @@ static int rtl8152_post_reset(struct usb_interface *intf)
/* reset the MAC address in case of policy change */
  	if (determine_ethernet_addr(tp, &ss) >= 0)
-		dev_set_mac_address(tp->netdev, (struct sockaddr *)&ss, NULL);
+		dev_set_mac_address(tp->netdev, &ss, NULL);
netdev = tp->netdev;
  	if (!netif_running(netdev))
diff --git a/net/core/dev.c b/net/core/dev.c
index f8c8aad7df2e..1f1900ec26b2 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -9683,6 +9683,7 @@ int netif_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,
DECLARE_RWSEM(dev_addr_sem); +/* "sa" is a true struct sockaddr with limited "sa_data" member. */
  int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name)
  {
  	size_t size = sizeof(sa->sa_data_min);
diff --git a/net/core/dev_api.c b/net/core/dev_api.c
index b5f293e637d9..e80404e76ca9 100644
--- a/net/core/dev_api.c
+++ b/net/core/dev_api.c
@@ -319,20 +319,20 @@ EXPORT_SYMBOL(dev_set_allmulti);
  /**
   * dev_set_mac_address() - change Media Access Control Address
   * @dev: device
- * @sa: new address
+ * @ss: new address
   * @extack: netlink extended ack
   *
   * Change the hardware (MAC) address of the device
   *
   * Return: 0 on success, -errno on failure.
   */
-int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
+int dev_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,
  			struct netlink_ext_ack *extack)
  {
  	int ret;
netdev_lock_ops(dev);
-	ret = netif_set_mac_address(dev, (struct sockaddr_storage *)sa, extack);
+	ret = netif_set_mac_address(dev, sa, extack);
  	netdev_unlock_ops(dev);
return ret;
diff --git a/net/ieee802154/nl-phy.c b/net/ieee802154/nl-phy.c
index ee2b190e8e0d..4c07a475c567 100644
--- a/net/ieee802154/nl-phy.c
+++ b/net/ieee802154/nl-phy.c
@@ -234,7 +234,7 @@ int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info)
  		 * dev_set_mac_address require RTNL_LOCK
  		 */
  		rtnl_lock();
-		rc = dev_set_mac_address(dev, (struct sockaddr *)&addr, NULL);
+		rc = dev_set_mac_address(dev, &addr, NULL);
  		rtnl_unlock();
  		if (rc)
  			goto dev_unregister;
diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index 0202db2aea3e..b36947063783 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -1058,7 +1058,7 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
  		break;
  	case ncsi_dev_state_config_apply_mac:
  		rtnl_lock();
-		ret = dev_set_mac_address(dev, (struct sockaddr *)&ndp->pending_mac, NULL);
+		ret = dev_set_mac_address(dev, &ndp->pending_mac, NULL);
  		rtnl_unlock();
  		if (ret < 0)
  			netdev_warn(dev, "NCSI: 'Writing MAC address to device failed\n");





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