If link is disconnected due to Authentication Failure (PIN or Key
Missing status) userspace will be notified about this with proper error
code. Many LE profiles define "PIN or Key Missing" status as indication
of remote lost bond so this allows userspace to take action on this.
@ Device Connected: 88:63:DF:88:0E:83 (1) flags 0x0000
02 01 1a 05 03 0a 18 0d 18 0b 09 48 65 61 72 74 ...........Heart
20 52 61 74 65 Rate
> HCI Event: Command Status (0x0f) plen 4
LE Read Remote Used Features (0x08|0x0016) ncmd 1
Status: Success (0x00)
> ACL Data RX: Handle 3585 flags 0x02 dlen 11
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0001-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: LE Meta Event (0x3e) plen 12
LE Read Remote Used Features (0x04)
Status: Success (0x00)
Handle: 3585
Features: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00
LE Encryption
< HCI Command: LE Start Encryption (0x08|0x0019) plen 28
Handle: 3585
Random number: 0x0000000000000000
Encrypted diversifier: 0x0000
Long term key: 26201cd479a0921b6f949f0b1fa8dc82
> HCI Event: Command Status (0x0f) plen 4
LE Start Encryption (0x08|0x0019) ncmd 1
Status: Success (0x00)
> HCI Event: Encryption Change (0x08) plen 4
Status: PIN or Key Missing (0x06)
Handle: 3585
Encryption: Disabled (0x00)
< HCI Command: Disconnect (0x01|0x0006) plen 3
Handle: 3585
Reason: Authentication Failure (0x05)
> HCI Event: Command Status (0x0f) plen 4
Disconnect (0x01|0x0006) ncmd 1
Status: Success (0x00)
> HCI Event: Disconnect Complete (0x05) plen 4
Status: Success (0x00)
Handle: 3585
Reason: Connection Terminated By Local Host (0x16)
@ Device Disconnected: 88:63:DF:88:0E:83 (1) reason 4
@ Device Connected: C4:43:8F:A3:4D:83 (0) flags 0x0000
08 09 4e 65 78 75 73 20 35 ..Nexus 5
> HCI Event: Command Status (0x0f) plen 4
Authentication Requested (0x01|0x0011) ncmd 1
Status: Success (0x00)
> HCI Event: Link Key Request (0x17) plen 6
Address: C4:43:8F:A3:4D:83 (LG Electronics)
< HCI Command: Link Key Request Reply (0x01|0x000b) plen 22
Address: C4:43:8F:A3:4D:83 (LG Electronics)
Link key: 080812e4aa97a863d11826f71f65a933
> HCI Event: Command Complete (0x0e) plen 10
Link Key Request Reply (0x01|0x000b) ncmd 1
Status: Success (0x00)
Address: C4:43:8F:A3:4D:83 (LG Electronics)
> HCI Event: Auth Complete (0x06) plen 3
Status: PIN or Key Missing (0x06)
Handle: 75
@ Authentication Failed: C4:43:8F:A3:4D:83 (0) status 0x05
< HCI Command: Disconnect (0x01|0x0006) plen 3
Handle: 75
Reason: Remote User Terminated Connection (0x13)
> HCI Event: Command Status (0x0f) plen 4
Disconnect (0x01|0x0006) ncmd 1
Status: Success (0x00)
> HCI Event: Disconnect Complete (0x05) plen 4
Status: Success (0x00)
Handle: 75
Reason: Connection Terminated By Local Host (0x16)
@ Device Disconnected: C4:43:8F:A3:4D:83 (0) reason 4
Signed-off-by: Szymon Janc <szymon.janc@xxxxxxxxxxx>
---
include/net/bluetooth/hci.h | 1 +
include/net/bluetooth/hci_core.h | 1 +
include/net/bluetooth/mgmt.h | 1 +
net/bluetooth/hci_event.c | 16 +++++++++++++++-
4 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index eefcf3e..0d450dc 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -445,6 +445,7 @@ enum {
/* ---- HCI Error Codes ---- */
#define HCI_ERROR_UNKNOWN_CONN_ID 0x02
#define HCI_ERROR_AUTH_FAILURE 0x05
+#define HCI_ERROR_PIN_OR_KEY_MISSING 0x06
#define HCI_ERROR_MEMORY_EXCEEDED 0x07
#define HCI_ERROR_CONNECTION_TIMEOUT 0x08
#define HCI_ERROR_REJ_LIMITED_RESOURCES 0x0d
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index dc71473..77d7fe1 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -654,6 +654,7 @@ enum {
HCI_CONN_PARAM_REMOVAL_PEND,
HCI_CONN_NEW_LINK_KEY,
HCI_CONN_SCANNING,
+ HCI_CONN_AUTH_FAILURE,
};
static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index ea73e08..7647964 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -645,6 +645,7 @@ struct mgmt_ev_device_connected {
#define MGMT_DEV_DISCONN_TIMEOUT 0x01
#define MGMT_DEV_DISCONN_LOCAL_HOST 0x02
#define MGMT_DEV_DISCONN_REMOTE 0x03
+#define MGMT_DEV_DISCONN_AUTH_FAILURE 0x04
#define MGMT_EV_DEVICE_DISCONNECTED 0x000C
struct mgmt_ev_device_disconnected {
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index d4b3dd5..4116379 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2332,7 +2332,7 @@ static u8 hci_to_mgmt_reason(u8 err)
static void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_ev_disconn_complete *ev = (void *) skb->data;
- u8 reason = hci_to_mgmt_reason(ev->reason);
+ u8 reason;
struct hci_conn_params *params;
struct hci_conn *conn;
bool mgmt_connected;
@@ -2355,6 +2355,12 @@ static void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
conn->state = BT_CLOSED;
mgmt_connected = test_and_clear_bit(HCI_CONN_MGMT_CONNECTED, &conn->flags);
+
+ if (test_bit(HCI_CONN_AUTH_FAILURE, &conn->flags))
+ reason = MGMT_DEV_DISCONN_AUTH_FAILURE;
+ else
+ reason = hci_to_mgmt_reason(ev->reason);
+
mgmt_device_disconnected(hdev, &conn->dst, conn->type, conn->dst_type,
reason, mgmt_connected);
@@ -2421,6 +2427,8 @@ static void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
goto unlock;
if (!ev->status) {
+ clear_bit(HCI_CONN_AUTH_FAILURE, &conn->flags);
+
if (!hci_conn_ssp_enabled(conn) &&
test_bit(HCI_CONN_REAUTH_PEND, &conn->flags)) {
BT_INFO("re-auth of legacy device is not possible.");
@@ -2429,6 +2437,9 @@ static void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
conn->sec_level = conn->pending_sec_level;
}
} else {
+ if (ev->status == HCI_ERROR_PIN_OR_KEY_MISSING)
+ set_bit(HCI_CONN_AUTH_FAILURE, &conn->flags);
+
mgmt_auth_failed(conn, ev->status);
}
@@ -2613,6 +2624,9 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
clear_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
if (ev->status && conn->state == BT_CONNECTED) {
+ if (ev->status == HCI_ERROR_PIN_OR_KEY_MISSING)
+ set_bit(HCI_CONN_AUTH_FAILURE, &conn->flags);
+
hci_disconnect(conn, HCI_ERROR_AUTH_FAILURE);
hci_conn_drop(conn);
goto unlock;
--
2.7.4
--
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