net/tls: Use RCU API to access tls_ctx->netdev

Tested: selftests
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2143700

Conflicts: skipped the mlx5e_ktls_handle_tx_skb bits, we don't have
    that code yet, it will come through the driver rebase

commit 94ce3b6
Author: Maxim Mikityanskiy <[email protected]>
Date:   Wed Aug 10 11:16:02 2022 +0300

    net/tls: Use RCU API to access tls_ctx->netdev

    Currently, tls_device_down synchronizes with tls_device_resync_rx using
    RCU, however, the pointer to netdev is stored using WRITE_ONCE and
    loaded using READ_ONCE.

    Although such approach is technically correct (rcu_dereference is
    essentially a READ_ONCE, and rcu_assign_pointer uses WRITE_ONCE to store
    NULL), using special RCU helpers for pointers is more valid, as it
    includes additional checks and might change the implementation
    transparently to the callers.

    Mark the netdev pointer as __rcu and use the correct RCU helpers to
    access it. For non-concurrent access pass the right conditions that
    guarantee safe access (locks taken, refcount value). Also use the
    correct helper in mlx5e, where even READ_ONCE was missing.

    The transition to RCU exposes existing issues, fixed by this commit:

    1. bond_tls_device_xmit could read netdev twice, and it could become
    NULL the second time, after the NULL check passed.

    2. Drivers shouldn't stop processing the last packet if tls_device_down
    just set netdev to NULL, before tls_dev_del was called. This prevents a
    possible packet drop when transitioning to the fallback software mode.

    Fixes: 89df6a8 ("net/bonding: Implement TLS TX device offload")
    Fixes: c55dcdd ("net/tls: Fix use-after-free after the TLS device goes down and up")
    Signed-off-by: Maxim Mikityanskiy <[email protected]>
    Link: https://lore.kernel.org/r/[email protected]
    Signed-off-by: Jakub Kicinski <[email protected]>

Signed-off-by: Sabrina Dubroca <[email protected]>

Author: Sabrina Dubroca

drivers/net/bonding/bond_main.c

@@ -5327,8 +5327,14 @@ static struct net_device *bond_sk_get_lower_dev(struct net_device *dev,
 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb,
 					struct net_device *dev)
 {
-	if (likely(bond_get_slave_by_dev(bond, tls_get_ctx(skb->sk)->netdev)))
-		return bond_dev_queue_xmit(bond, skb, tls_get_ctx(skb->sk)->netdev);
+	struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev);
+
+	/* tls_netdev might become NULL, even if tls_is_sk_tx_device_offloaded
+	 * was true, if tls_device_down is running in parallel, but it's OK,
+	 * because bond_get_slave_by_dev has a NULL check.
+	 */
+	if (likely(bond_get_slave_by_dev(bond, tls_netdev)))
+		return bond_dev_queue_xmit(bond, skb, tls_netdev);
 	return bond_tx_drop(dev, skb);
 }
 #endif

drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c

@@ -1932,6 +1932,7 @@ static int chcr_ktls_xmit(struct sk_buff *skb, struct net_device *dev)
 	int data_len, qidx, ret = 0, mss;
 	struct tls_record_info *record;
 	struct chcr_ktls_info *tx_info;
+	struct net_device *tls_netdev;
 	struct tls_context *tls_ctx;
 	struct sge_eth_txq *q;
 	struct adapter *adap;
@@ -1945,7 +1946,12 @@ static int chcr_ktls_xmit(struct sk_buff *skb, struct net_device *dev)
 	mss = skb_is_gso(skb) ? skb_shinfo(skb)->gso_size : data_len;
 
 	tls_ctx = tls_get_ctx(skb->sk);
-	if (unlikely(tls_ctx->netdev != dev))
+	tls_netdev = rcu_dereference_bh(tls_ctx->netdev);
+	/* Don't quit on NULL: if tls_device_down is running in parallel,
+	 * netdev might become NULL, even if tls_is_sk_tx_device_offloaded was
+	 * true. Rather continue processing this packet.
+	 */
+	if (unlikely(tls_netdev && tls_netdev != dev))
 		goto out;
 
 	tx_ctx = chcr_get_ktls_tx_context(tls_ctx);

include/net/tls.h

@@ -237,7 +237,7 @@ struct tls_context {
 	void *priv_ctx_tx;
 	void *priv_ctx_rx;
 
-	struct net_device *netdev;
+	struct net_device __rcu *netdev;
 
 	/* rw cache line */
 	struct cipher_context tx;

net/tls/tls_device.c

@@ -71,7 +71,13 @@ static void tls_device_tx_del_task(struct work_struct *work)
 	struct tls_offload_context_tx *offload_ctx =
 		container_of(work, struct tls_offload_context_tx, destruct_work);
 	struct tls_context *ctx = offload_ctx->ctx;
-	struct net_device *netdev = ctx->netdev;
+	struct net_device *netdev;
+
+	/* Safe, because this is the destroy flow, refcount is 0, so
+	 * tls_device_down can't store this field in parallel.
+	 */
+	netdev = rcu_dereference_protected(ctx->netdev,
+					   !refcount_read(&ctx->refcount));
 
 	netdev->tlsdev_ops->tls_dev_del(netdev, ctx, TLS_OFFLOAD_CTX_DIR_TX);
 	dev_put(netdev);
@@ -81,6 +87,7 @@ static void tls_device_tx_del_task(struct work_struct *work)
 
 static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
 {
+	struct net_device *netdev;
 	unsigned long flags;
 	bool async_cleanup;
 
@@ -91,7 +98,14 @@ static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
 	}
 
 	list_del(&ctx->list); /* Remove from tls_device_list / tls_device_down_list */
-	async_cleanup = ctx->netdev && ctx->tx_conf == TLS_HW;
+
+	/* Safe, because this is the destroy flow, refcount is 0, so
+	 * tls_device_down can't store this field in parallel.
+	 */
+	netdev = rcu_dereference_protected(ctx->netdev,
+					   !refcount_read(&ctx->refcount));
+
+	async_cleanup = netdev && ctx->tx_conf == TLS_HW;
 	if (async_cleanup) {
 		struct tls_offload_context_tx *offload_ctx = tls_offload_ctx_tx(ctx);
 
@@ -229,7 +243,8 @@ static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx,
 
 	trace_tls_device_tx_resync_send(sk, seq, rcd_sn);
 	down_read(&device_offload_lock);
-	netdev = tls_ctx->netdev;
+	netdev = rcu_dereference_protected(tls_ctx->netdev,
+					   lockdep_is_held(&device_offload_lock));
 	if (netdev)
 		err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq,
 							 rcd_sn,
@@ -710,7 +725,7 @@ static void tls_device_resync_rx(struct tls_context *tls_ctx,
 
 	trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type);
 	rcu_read_lock();
-	netdev = READ_ONCE(tls_ctx->netdev);
+	netdev = rcu_dereference(tls_ctx->netdev);
 	if (netdev)
 		netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn,
 						   TLS_OFFLOAD_CTX_DIR_RX);
@@ -1035,7 +1050,7 @@ static void tls_device_attach(struct tls_context *ctx, struct sock *sk,
 	if (sk->sk_destruct != tls_device_sk_destruct) {
 		refcount_set(&ctx->refcount, 1);
 		dev_hold(netdev);
-		ctx->netdev = netdev;
+		RCU_INIT_POINTER(ctx->netdev, netdev);
 		spin_lock_irq(&tls_device_lock);
 		list_add_tail(&ctx->list, &tls_device_list);
 		spin_unlock_irq(&tls_device_lock);
@@ -1306,7 +1321,8 @@ void tls_device_offload_cleanup_rx(struct sock *sk)
 	struct net_device *netdev;
 
 	down_read(&device_offload_lock);
-	netdev = tls_ctx->netdev;
+	netdev = rcu_dereference_protected(tls_ctx->netdev,
+					   lockdep_is_held(&device_offload_lock));
 	if (!netdev)
 		goto out;
 
@@ -1315,7 +1331,7 @@ void tls_device_offload_cleanup_rx(struct sock *sk)
 
 	if (tls_ctx->tx_conf != TLS_HW) {
 		dev_put(netdev);
-		tls_ctx->netdev = NULL;
+		rcu_assign_pointer(tls_ctx->netdev, NULL);
 	} else {
 		set_bit(TLS_RX_DEV_CLOSED, &tls_ctx->flags);
 	}
@@ -1335,7 +1351,11 @@ static int tls_device_down(struct net_device *netdev)
 
 	spin_lock_irqsave(&tls_device_lock, flags);
 	list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) {
-		if (ctx->netdev != netdev ||
+		struct net_device *ctx_netdev =
+			rcu_dereference_protected(ctx->netdev,
+						  lockdep_is_held(&device_offload_lock));
+
+		if (ctx_netdev != netdev ||
 		    !refcount_inc_not_zero(&ctx->refcount))
 			continue;
 
@@ -1352,7 +1372,7 @@ static int tls_device_down(struct net_device *netdev)
 		/* Stop the RX and TX resync.
 		 * tls_dev_resync must not be called after tls_dev_del.
 		 */
-		WRITE_ONCE(ctx->netdev, NULL);
+		rcu_assign_pointer(ctx->netdev, NULL);
 
 		/* Start skipping the RX resync logic completely. */
 		set_bit(TLS_RX_DEV_DEGRADED, &ctx->flags);

net/tls/tls_device_fallback.c

@@ -426,7 +426,8 @@ struct sk_buff *tls_validate_xmit_skb(struct sock *sk,
 				      struct net_device *dev,
 				      struct sk_buff *skb)
 {
-	if (dev == tls_get_ctx(sk)->netdev || netif_is_bond_master(dev))
+	if (dev == rcu_dereference_bh(tls_get_ctx(sk)->netdev) ||
+	    netif_is_bond_master(dev))
 		return skb;
 
 	return tls_sw_fallback(sk, skb);