Re: [PATCH 3/8] Bluetooth: Add new structures for handling SMP Long Term Keys

This includes a new list for storing the keys and a new structure used
to represent each key.

Some notes: authenticated is used to identify that the key may be used
to setup a HIGH security link. As the same list is used to store both
the STK's and the LTK's the type field is used so we can separate
between those two types of keys and if the key should be used when
in the master or slave role.

Signed-off-by: Vinicius Costa Gomes <redacted>
---
 include/net/bluetooth/hci.h      |    5 +++++
 include/net/bluetooth/hci_core.h |   15 +++++++++++++++
 net/bluetooth/hci_core.c         |   31 +++++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+), 0 deletions(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index cb9097a..83f045a 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h

@@ -274,6 +274,11 @@ enum {
 #define HCI_LK_SMP_LTK			0x81
 #define HCI_LK_SMP_IRK			0x82
 #define HCI_LK_SMP_CSRK			0x83
+/* The spec doesn't define types for SMP keys, the _MASTER suffix is implied */
+#define HCI_SMP_STK			0x80
+#define HCI_SMP_STK_SLAVE		0x81
+#define HCI_SMP_LTK			0x82
+#define HCI_SMP_LTK_SLAVE		0x83
 
 /* ---- HCI Error Codes ---- */
 #define HCI_ERROR_AUTH_FAILURE		0x05

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 896d9e4..06eab3f 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h

@@ -88,6 +88,18 @@ struct bt_uuid {
 	u8 svc_hint;
 };
 
+struct smp_ltk {
+	struct list_head list;
+	bdaddr_t bdaddr;
+	u8 bdaddr_type;
+	u8 authenticated;
+	u8 type;
+	u8 enc_size;
+	__le16 ediv;
+	u8 rand[8];
+	u8 val[16];
+} __packed;
+
 struct key_master_id {
 	__le16 ediv;
 	u8 rand[8];

@@ -239,6 +251,8 @@ struct hci_dev {
 
 	struct list_head	link_keys;
 
+	struct list_head	ltks;
+