[PATCH net-next 0/2] rxrpc: Fixes

[PATCH net-next 0/2] rxrpc: Fixes

[David Howells]

Here are a couple of fixes that need to be applied on top of rxrpc patches
in net-next:

 (1) Fix a bug in the connection bundle changes in the net-next tree.

 (2) Fix the loss of final ACK on socket shutdown.

The patches are tagged here:

	git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
	rxrpc-next-20201015

David
---
David Howells (2):
      rxrpc: Fix bundle counting for exclusive connections
      rxrpc: Fix loss of final ack on shutdown


 net/rxrpc/ar-internal.h | 1 +
 net/rxrpc/conn_client.c | 3 +++
 net/rxrpc/conn_event.c  | 6 +++---
 3 files changed, 7 insertions(+), 3 deletions(-)

[PATCH net-next 1/2] rxrpc: Fix bundle counting for exclusive connections

[David Howells]

Fix rxrpc_unbundle_conn() to not drop the bundle usage count when cleaning
up an exclusive connection.

Based on the suggested fix from Hillf Danton.

Fixes: 245500d853e9 ("rxrpc: Rewrite the client connection manager")
Reported-by: syzbot+d57aaf84dd8a550e6d91@syzkaller.appspotmail.com
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Hillf Danton <hdanton@sina.com>
---

 net/rxrpc/conn_client.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c
index 78c845a4f1ad..5d9adfd4c84f 100644
--- a/net/rxrpc/conn_client.c
+++ b/net/rxrpc/conn_client.c
@@ -901,7 +901,7 @@ static void rxrpc_unbundle_conn(struct rxrpc_connection *conn)
 	struct rxrpc_bundle *bundle = conn->bundle;
 	struct rxrpc_local *local = bundle->params.local;
 	unsigned int bindex;
-	bool need_drop = false;
+	bool need_drop = false, need_put = false;
 	int i;
 
 	_enter("C=%x", conn->debug_id);
@@ -928,10 +928,11 @@ static void rxrpc_unbundle_conn(struct rxrpc_connection *conn)
 		if (i == ARRAY_SIZE(bundle->conns) && !bundle->params.exclusive) {
 			_debug("erase bundle");
 			rb_erase(&bundle->local_node, &local->client_bundles);
+			need_put = true;
 		}
 
 		spin_unlock(&local->client_bundles_lock);
-		if (i == ARRAY_SIZE(bundle->conns))
+		if (need_put)
 			rxrpc_put_bundle(bundle);
 	}
 

[PATCH net-next 2/2] rxrpc: Fix loss of final ack on shutdown

[David Howells]

Fix the loss of transmission of a call's final ack when a socket gets shut
down.  This means that the server will retransmit the last data packet or
send a ping ack and then get an ICMP indicating the port got closed.  The
server will then view this as a failure.

Fixes: 3136ef49a14c ("rxrpc: Delay terminal ACK transmission on a client call")
Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/ar-internal.h |    1 +
 net/rxrpc/conn_client.c |    3 +++
 net/rxrpc/conn_event.c  |    6 +++---
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index c9287b6551df..dce48162f6c2 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -831,6 +831,7 @@ void rxrpc_clean_up_local_conns(struct rxrpc_local *);
  * conn_event.c
  */
 void rxrpc_process_connection(struct work_struct *);
+void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
 
 /*
  * conn_object.c
diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c
index 5d9adfd4c84f..7e574c75be8e 100644
--- a/net/rxrpc/conn_client.c
+++ b/net/rxrpc/conn_client.c
@@ -906,6 +906,9 @@ static void rxrpc_unbundle_conn(struct rxrpc_connection *conn)
 
 	_enter("C=%x", conn->debug_id);
 
+	if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
+		rxrpc_process_delayed_final_acks(conn, true);
+
 	spin_lock(&bundle->channel_lock);
 	bindex = conn->bundle_shift / RXRPC_MAXCALLS;
 	if (bundle->conns[bindex] == conn) {
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c
index 6b7c6f4a82e3..aff184145ffa 100644
--- a/net/rxrpc/conn_event.c
+++ b/net/rxrpc/conn_event.c
@@ -397,7 +397,7 @@ static void rxrpc_secure_connection(struct rxrpc_connection *conn)
 /*
  * Process delayed final ACKs that we haven't subsumed into a subsequent call.
  */
-static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn)
+void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn, bool force)
 {
 	unsigned long j = jiffies, next_j;
 	unsigned int channel;
@@ -416,7 +416,7 @@ static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn)
 		smp_rmb(); /* vs rxrpc_disconnect_client_call */
 		ack_at = READ_ONCE(chan->final_ack_at);
 
-		if (time_before(j, ack_at)) {
+		if (time_before(j, ack_at) && !force) {
 			if (time_before(ack_at, next_j)) {
 				next_j = ack_at;
 				set = true;
@@ -450,7 +450,7 @@ static void rxrpc_do_process_connection(struct rxrpc_connection *conn)
 
 	/* Process delayed ACKs whose time has come. */
 	if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
-		rxrpc_process_delayed_final_acks(conn);
+		rxrpc_process_delayed_final_acks(conn, false);
 
 	/* go through the conn-level event packets, releasing the ref on this
 	 * connection that each one has when we've finished with it */

Re: [PATCH net-next 0/2] rxrpc: Fixes

[Jakub Kicinski]

On Thu, 15 Oct 2020 13:59:11 +0100 David Howells wrote:
> Here are a couple of fixes that need to be applied on top of rxrpc patches
> in net-next:
> 
>  (1) Fix a bug in the connection bundle changes in the net-next tree.
> 
>  (2) Fix the loss of final ACK on socket shutdown.
> 
> The patches are tagged here:
> 
> 	git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
> 	rxrpc-next-20201015


Pulled, thanks!

Re: [PATCH net-next 0/2] rxrpc: Fixes

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (refs/heads/master):

On Thu, 15 Oct 2020 13:59:11 +0100 you wrote:
> Here are a couple of fixes that need to be applied on top of rxrpc patches
> in net-next:
> 
>  (1) Fix a bug in the connection bundle changes in the net-next tree.
> 
>  (2) Fix the loss of final ACK on socket shutdown.
> 
> [...]

Here is the summary with links:
  - [net-next,1/2] rxrpc: Fix bundle counting for exclusive connections
    https://git.kernel.org/netdev/net-next/c/f3af4ad1e08a
  - [net-next,2/2] rxrpc: Fix loss of final ack on shutdown
    https://git.kernel.org/netdev/net-next/c/ddc7834af8d5

You are awesome, thank you!
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