net: rmnet: fix suspicious RCU usage

rmnet_get_port() internally calls rcu_dereference_rtnl(),
which checks RTNL.
But rmnet_get_port() could be called by packet path.
The packet path is not protected by RTNL.
So, the suspicious RCU usage problem occurs.

Test commands:
    ip netns add nst
    ip link add veth0 type veth peer name veth1
    ip link set veth1 netns nst
    ip link add rmnet0 link veth0 type rmnet mux_id 1
    ip netns exec nst ip link add rmnet1 link veth1 type rmnet mux_id 1
    ip netns exec nst ip link set veth1 up
    ip netns exec nst ip link set rmnet1 up
    ip netns exec nst ip a a 192.168.100.2/24 dev rmnet1
    ip link set veth0 up
    ip link set rmnet0 up
    ip a a 192.168.100.1/24 dev rmnet0
    ping 192.168.100.2

Splat looks like:
[  339.775811][  T969] =============================
[  339.777204][  T969] WARNING: suspicious RCU usage
[  339.778188][  T969] 5.5.0+ torvalds#407 Not tainted
[  339.779123][  T969] -----------------------------
[  339.780100][  T969] drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c:389 suspicious rcu_dereference_check() usage!
[  339.781943][  T969]
[  339.781943][  T969] other info that might help us debug this:
[  339.781943][  T969]
[  339.783475][  T969]
[  339.783475][  T969] rcu_scheduler_active = 2, debug_locks = 1
[  339.784656][  T969] 5 locks held by ping/969:
[  339.785406][  T969]  #0: ffff88804cb897f0 (sk_lock-AF_INET){+.+.}, at: raw_sendmsg+0xab8/0x2980
[  339.786766][  T969]  #1: ffffffff92925460 (rcu_read_lock_bh){....}, at: ip_finish_output2+0x243/0x2150
[  339.788308][  T969]  #2: ffffffff92925460 (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x213/0x2e10
[  339.790662][  T969]  #3: ffff88805a924158 (&dev->qdisc_running_key#3){+...}, at: ip_finish_output2+0x714/0x2150
[  339.792072][  T969]  #4: ffff88805b4fdc98 (&dev->qdisc_xmit_lock_key#3){+.-.}, at: sch_direct_xmit+0x1e2/0x1020
[  339.793445][  T969]
[  339.793445][  T969] stack backtrace:
[  339.794691][  T969] CPU: 3 PID: 969 Comm: ping Not tainted 5.5.0+ torvalds#407
[  339.795946][  T969] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[  339.797621][  T969] Call Trace:
[  339.798249][  T969]  dump_stack+0x96/0xdb
[  339.798847][  T969]  rmnet_get_port.part.9+0x76/0x80 [rmnet]
[  339.799583][  T969]  rmnet_egress_handler+0x107/0x420 [rmnet]
[  339.800350][  T969]  ? sch_direct_xmit+0x1e2/0x1020
[  339.801027][  T969]  rmnet_vnd_start_xmit+0x3d/0xa0 [rmnet]
[  339.801784][  T969]  dev_hard_start_xmit+0x160/0x740
[  339.802667][  T969]  sch_direct_xmit+0x265/0x1020
[ ... ]

Fixes: ceed73a ("drivers: net: ethernet: qualcomm: rmnet: Initial implementation")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>

drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c

@@ -382,11 +382,10 @@ struct rtnl_link_ops rmnet_link_ops __read_mostly = {
 	.fill_info	= rmnet_fill_info,
 };
 
-/* Needs either rcu_read_lock() or rtnl lock */
-struct rmnet_port *rmnet_get_port(struct net_device *real_dev)
+struct rmnet_port *rmnet_get_port_rcu(struct net_device *real_dev)
 {
 	if (rmnet_is_real_dev_registered(real_dev))
-		return rcu_dereference_rtnl(real_dev->rx_handler_data);
+		return rcu_dereference(real_dev->rx_handler_data);
 	else
 		return NULL;
 }
@@ -412,7 +411,7 @@ int rmnet_add_bridge(struct net_device *rmnet_dev,
 	struct rmnet_port *port, *slave_port;
 	int err;
 
-	port = rmnet_get_port(real_dev);
+	port = rmnet_get_port_rtnl(real_dev);
 
 	/* If there is more than one rmnet dev attached, its probably being
 	 * used for muxing. Skip the briding in that case
@@ -427,7 +426,7 @@ int rmnet_add_bridge(struct net_device *rmnet_dev,
 	if (err)
 		return -EBUSY;
 
-	slave_port = rmnet_get_port(slave_dev);
+	slave_port = rmnet_get_port_rtnl(slave_dev);
 	slave_port->rmnet_mode = RMNET_EPMODE_BRIDGE;
 	slave_port->bridge_ep = real_dev;
 
@@ -445,11 +444,11 @@ int rmnet_del_bridge(struct net_device *rmnet_dev,
 	struct net_device *real_dev = priv->real_dev;
 	struct rmnet_port *port, *slave_port;
 
-	port = rmnet_get_port(real_dev);
+	port = rmnet_get_port_rtnl(real_dev);
 	port->rmnet_mode = RMNET_EPMODE_VND;
 	port->bridge_ep = NULL;
 
-	slave_port = rmnet_get_port(slave_dev);
+	slave_port = rmnet_get_port_rtnl(slave_dev);
 	rmnet_unregister_real_device(slave_dev, slave_port);
 
 	netdev_dbg(slave_dev, "removed from rmnet as slave\n");

drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h

@@ -65,7 +65,7 @@ struct rmnet_priv {
 	struct rmnet_priv_stats stats;
 };
 
-struct rmnet_port *rmnet_get_port(struct net_device *real_dev);
+struct rmnet_port *rmnet_get_port_rcu(struct net_device *real_dev);
 struct rmnet_endpoint *rmnet_get_endpoint(struct rmnet_port *port, u8 mux_id);
 int rmnet_add_bridge(struct net_device *rmnet_dev,
 		     struct net_device *slave_dev,

drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c

@@ -184,7 +184,7 @@ rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb)
 		return RX_HANDLER_PASS;
 
 	dev = skb->dev;
-	port = rmnet_get_port(dev);
+	port = rmnet_get_port_rcu(dev);
 
 	switch (port->rmnet_mode) {
 	case RMNET_EPMODE_VND:
@@ -217,7 +217,7 @@ void rmnet_egress_handler(struct sk_buff *skb)
 	skb->dev = priv->real_dev;
 	mux_id = priv->mux_id;
 
-	port = rmnet_get_port(skb->dev);
+	port = rmnet_get_port_rcu(skb->dev);
 	if (!port)
 		goto drop;
 

drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c

@@ -50,7 +50,9 @@ static netdev_tx_t rmnet_vnd_start_xmit(struct sk_buff *skb,
 
 	priv = netdev_priv(dev);
 	if (priv->real_dev) {
+		rcu_read_lock();
 		rmnet_egress_handler(skb);
+		rcu_read_unlock();
 	} else {
 		this_cpu_inc(priv->pcpu_stats->stats.tx_drops);
 		kfree_skb(skb);