Bluetooth: ISO: Reassociate a socket with an active BIS

[ Upstream commit fa224d0c094a458e9ebf5ea9b1c696136b7af427 ]

For ISO Broadcast, all BISes from a BIG have the same lifespan - they
cannot be created or terminated independently from each other.

This links together all BIS hcons that are part of the same BIG, so all
hcons are kept alive as long as the BIG is active.

If multiple BIS sockets are opened for a BIG handle, and only part of
them are closed at some point, the associated hcons will be marked as
open. If new sockets will later be opened for the same BIG, they will
be reassociated with the open BIS hcons.

All BIS hcons will be cleaned up and the BIG will be terminated when
the last BIS socket is closed from userspace.

Signed-off-by: Iulia Tanasescu <iulia.tanasescu@nxp.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Stable-dep-of: 581dd2dc168f ("Bluetooth: hci_event: Fix using rcu_read_(un)lock while iterating")
Signed-off-by: Sasha Levin <sashal@kernel.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 4185eb679180..e9214ccfde2d 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1295,6 +1295,30 @@ static inline struct hci_conn *hci_conn_hash_lookup_big_any_dst(struct hci_dev *
 }
 
 static inline struct hci_conn *
+hci_conn_hash_lookup_big_state(struct hci_dev *hdev, __u8 handle,  __u16 state)
+{
+	struct hci_conn_hash *h = &hdev->conn_hash;
+	struct hci_conn  *c;
+
+	rcu_read_lock();
+
+	list_for_each_entry_rcu(c, &h->list, list) {
+		if (bacmp(&c->dst, BDADDR_ANY) || c->type != ISO_LINK ||
+			c->state != state)
+			continue;
+
+		if (handle == c->iso_qos.bcast.big) {
+			rcu_read_unlock();
+			return c;
+		}
+	}
+
+	rcu_read_unlock();
+
+	return NULL;
+}
+
+static inline struct hci_conn *
 hci_conn_hash_lookup_pa_sync_big_handle(struct hci_dev *hdev, __u8 big)
 {
 	struct hci_conn_hash *h = &hdev->conn_hash;