net: bridge: move bridge ioctls out of .ndo_do_ioctl

Working towards obsoleting the .ndo_do_ioctl operation entirely,
stop passing the SIOCBRADDIF/SIOCBRDELIF device ioctl commands
into this callback.

My first attempt was to add another ndo_siocbr() callback, but
as there is only a single driver that takes these commands and
there is already a hook mechanism to call directly into this
driver, extend this hook instead, and use it for both the
deviceless and the device specific ioctl commands.

Cc: Roopa Prabhu <roopa@nvidia.com>
Cc: Nikolay Aleksandrov <nikolay@nvidia.com>
Cc: bridge@lists.linux-foundation.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/if_bridge.h

@@ -61,7 +61,12 @@ struct br_ip_list {
 
 #define BR_DEFAULT_AGEING_TIME	(300 * HZ)
 
-extern void brioctl_set(int (*ioctl_hook)(struct net *, unsigned int, void __user *));
+struct net_bridge;
+void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br,
+			     unsigned int cmd, struct ifreq *ifr,
+			     void __user *uarg));
+int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd,
+		  struct ifreq *ifr, void __user *uarg);
 
 #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)
 int br_multicast_list_adjacent(struct net_device *dev,

net/bridge/br.c

@@ -359,7 +359,7 @@ static int __init br_init(void)
 	if (err)
 		goto err_out5;
 
-	brioctl_set(br_ioctl_deviceless_stub);
+	brioctl_set(br_ioctl_stub);
 
 #if IS_ENABLED(CONFIG_ATM_LANE)
 	br_fdb_test_addr_hook = br_fdb_test_addr;

net/bridge/br_device.c

@@ -454,7 +454,6 @@ static const struct net_device_ops br_netdev_ops = {
 	.ndo_set_rx_mode	 = br_dev_set_multicast_list,
 	.ndo_change_rx_flags	 = br_dev_change_rx_flags,
 	.ndo_change_mtu		 = br_change_mtu,
-	.ndo_do_ioctl		 = br_dev_ioctl,
 	.ndo_siocdevprivate	 = br_dev_siocdevprivate,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_netpoll_setup	 = br_netpoll_setup,

net/bridge/br_ioctl.c

@@ -366,7 +366,8 @@ static int old_deviceless(struct net *net, void __user *uarg)
 	return -EOPNOTSUPP;
 }
 
-int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
+int br_ioctl_stub(struct net *net, struct net_bridge *br, unsigned int cmd,
+		  struct ifreq *ifr, void __user *uarg)
 {
 	switch (cmd) {
 	case SIOCGIFBR:
@@ -390,21 +391,11 @@ int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uar
 
 		return br_del_bridge(net, buf);
 	}
-	}
-	return -EOPNOTSUPP;
-}
-
-int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
-	struct net_bridge *br = netdev_priv(dev);
 
-	switch (cmd) {
 	case SIOCBRADDIF:
 	case SIOCBRDELIF:
-		return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
+		return add_del_if(br, ifr->ifr_ifindex, cmd == SIOCBRADDIF);
 
 	}
-
-	br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
 	return -EOPNOTSUPP;
 }

net/bridge/br_private.h

@@ -851,11 +851,10 @@ br_port_get_check_rtnl(const struct net_device *dev)
 }
 
 /* br_ioctl.c */
-int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq,
 			  void __user *data, int cmd);
-int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
-			     void __user *arg);
+int br_ioctl_stub(struct net *net, struct net_bridge *br, unsigned int cmd,
+		  struct ifreq *ifr, void __user *uarg);
 
 /* br_multicast.c */
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING

net/core/dev_ioctl.c

@@ -6,6 +6,7 @@
 #include <linux/rtnetlink.h>
 #include <linux/net_tstamp.h>
 #include <linux/wireless.h>
+#include <linux/if_bridge.h>
 #include <net/dsa.h>
 #include <net/wext.h>
 
@@ -374,6 +375,12 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
 	case SIOCWANDEV:
 		return dev_siocwandev(dev, &ifr->ifr_settings);
 
+	case SIOCBRADDIF:
+	case SIOCBRDELIF:
+		if (!netif_device_present(dev))
+			return -ENODEV;
+		return br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
+
 	case SIOCSHWTSTAMP:
 		err = net_hwtstamp_validate(ifr);
 		if (err)
@@ -399,9 +406,7 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
 		    cmd == SIOCBONDSETHWADDR ||
 		    cmd == SIOCBONDSLAVEINFOQUERY ||
 		    cmd == SIOCBONDINFOQUERY ||
-		    cmd == SIOCBONDCHANGEACTIVE ||
-		    cmd == SIOCBRADDIF ||
-		    cmd == SIOCBRDELIF) {
+		    cmd == SIOCBONDCHANGEACTIVE) {
 			err = dev_do_ioctl(dev, ifr, cmd);
 		} else
 			err = -EINVAL;

net/socket.c

@@ -1064,9 +1064,13 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
  */
 
 static DEFINE_MUTEX(br_ioctl_mutex);
-static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
+static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br,
+			    unsigned int cmd, struct ifreq *ifr,
+			    void __user *uarg);
 
-void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
+void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br,
+			     unsigned int cmd, struct ifreq *ifr,
+			     void __user *uarg))
 {
 	mutex_lock(&br_ioctl_mutex);
 	br_ioctl_hook = hook;
@@ -1074,6 +1078,22 @@ void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
 }
 EXPORT_SYMBOL(brioctl_set);
 
+int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd,
+		  struct ifreq *ifr, void __user *uarg)
+{
+	int err = -ENOPKG;
+
+	if (!br_ioctl_hook)
+		request_module("bridge");
+
+	mutex_lock(&br_ioctl_mutex);
+	if (br_ioctl_hook)
+		err = br_ioctl_hook(net, br, cmd, ifr, uarg);
+	mutex_unlock(&br_ioctl_mutex);
+
+	return err;
+}
+
 static DEFINE_MUTEX(vlan_ioctl_mutex);
 static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
 
@@ -1162,14 +1182,7 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 		case SIOCSIFBR:
 		case SIOCBRADDBR:
 		case SIOCBRDELBR:
-			err = -ENOPKG;
-			if (!br_ioctl_hook)
-				request_module("bridge");
-
-			mutex_lock(&br_ioctl_mutex);
-			if (br_ioctl_hook)
-				err = br_ioctl_hook(net, cmd, argp);
-			mutex_unlock(&br_ioctl_mutex);
+			err = br_ioctl_call(net, NULL, cmd, NULL, argp);
 			break;
 		case SIOCGIFVLAN:
 		case SIOCSIFVLAN: