tipc: Ignore broadcast acknowledgements that are out-of-range

Adds checks to TIPC's broadcast link so that it ignores any
acknowledgement message containing a sequence number that does not
correspond to an unacknowledged message currently in the broadcast
link's transmit queue.

This change prevents the broadcast link from becoming stalled if a
newly booted node receives stale broadcast link acknowledgement
information from another node that has not yet fully synchronized
its end of the broadcast link to reflect the current state of the
new node's end.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

1 files changed, 28 insertions, 7 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 4609819ea807..15eb74458748 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -237,14 +237,36 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
 	struct sk_buff *next;
 	unsigned int released = 0;
 
-	if (less_eq(acked, n_ptr->bclink.acked))
-		return;
-
 	spin_lock_bh(&bc_lock);
 
-	/* Skip over packets that node has previously acknowledged */
-
+	/* Bail out if tx queue is empty (no clean up is required) */
 	crs = bcl->first_out;
+	if (!crs)
+		goto exit;
+
+	/* Determine which messages need to be acknowledged */
+	if (acked == INVALID_LINK_SEQ) {
+		/*
+		 * Contact with specified node has been lost, so need to
+		 * acknowledge sent messages only (if other nodes still exist)
+		 * or both sent and unsent messages (otherwise)
+		 */
+		if (bclink->bcast_nodes.count)
+			acked = bcl->fsm_msg_cnt;
+		else
+			acked = bcl->next_out_no;
+	} else {
+		/*
+		 * Bail out if specified sequence number does not correspond
+		 * to a message that has been sent and not yet acknowledged
+		 */
+		if (less(acked, buf_seqno(crs)) ||
+		    less(bcl->fsm_msg_cnt, acked) ||
+		    less_eq(acked, n_ptr->bclink.acked))
+			goto exit;
+	}
+
+	/* Skip over packets that node has previously acknowledged */
 	while (crs && less_eq(buf_seqno(crs), n_ptr->bclink.acked))
 		crs = crs->next;
 
@@ -255,8 +277,6 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
 
 		if (crs != bcl->next_out)
 			bcbuf_decr_acks(crs);
-		else if (bclink->bcast_nodes.count)
-			break;
 		else {
 			bcbuf_set_acks(crs, 0);
 			bcl->next_out = next;
@@ -281,6 +301,7 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
 	}
 	if (unlikely(released && !list_empty(&bcl->waiting_ports)))
 		tipc_link_wakeup_ports(bcl, 0);
+exit:
 	spin_unlock_bh(&bc_lock);
 }