Re: Security block and Bluez - connection issue with Android

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Hi,

Here is an ugly patch only for understanding or testing purpose.

It did correct my connections issues but there might side effects (like a
deadlock although I did not have any).

If you have any advise on how to fix this connection issue in a clean way,
I would be glad to know it. I will be trying to do something cleaner in the
next days.

Thank you,

Fabien

---

--- linux-4.9.109/net/bluetooth/hci_core.c	2018-09-26 11:09:46.313308347 +0200
+++ linux/net/bluetooth/hci_core.c	2018-09-26 11:08:40.633482950 +0200
@@ -4038,6 +4038,32 @@
 	kfree_skb(skb);
 }

+static int hci_acldata_packet_has_pending_sec_level(struct hci_dev *hdev,
+                struct sk_buff *skb)
+{
+	struct hci_acl_hdr *hdr = (void *) skb->data;
+	struct hci_conn *hcon;
+	__u16 handle;
+
+	handle = __le16_to_cpu(hdr->handle);
+	handle = hci_handle(handle);
+
+	BT_DBG("#hci_acldata_packet_has_pending_sec_level: before lock");
+	hci_dev_lock(hdev);
+	BT_DBG("#hci_acldata_packet_has_pending_sec_level: after lock");
+
+	hcon = hci_conn_hash_lookup_handle(hdev, handle);
+
+	hci_dev_unlock(hdev);
+
+	if (hcon) {
+		return hcon->pending_sec_level != hcon->sec_level;
+	}
+
+	return 0;
+}
+
+
 /* SCO data packet */
 static void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb)
 {
@@ -4164,6 +4190,39 @@
 	spin_unlock_irqrestore(&hdev->cmd_q.lock, flags);
 }

+static struct sk_buff *hci_dequeue_rx_packet(struct hci_dev *hdev)
+{
+	unsigned long flags;
+	struct sk_buff *skb;
+	struct sk_buff_head *list = &hdev->rx_q;
+
+	BT_DBG("#hci_dequeue_rx_packet: before lock");
+	spin_lock_irqsave(&list->lock, flags);
+	BT_DBG("#hci_dequeue_rx_packet: after lock");
+
+	skb = skb_peek(list);
+
+	while (skb) {
+		if (hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT) {
+			break;
+		}
+
+		if (!hci_acldata_packet_has_pending_sec_level(hdev, skb)) {
+			break;
+		}
+
+		BT_DBG("skipping ACL packet (delayed because of pending sec level)");
+		skb = skb_peek_next(skb, list);
+	}
+
+	if (skb)
+		__skb_unlink(skb, list);
+
+	spin_unlock_irqrestore(&list->lock, flags);
+
+	return skb;
+}
+
 static void hci_rx_work(struct work_struct *work)
 {
 	struct hci_dev *hdev = container_of(work, struct hci_dev, rx_work);
@@ -4171,7 +4230,7 @@

 	BT_DBG("%s", hdev->name);

-	while ((skb = skb_dequeue(&hdev->rx_q))) {
+	while ((skb = hci_dequeue_rx_packet(hdev))) {
 		/* Send copy to monitor */
 		hci_send_to_monitor(hdev, skb);



On Tue, Sep 25, 2018 at 06:08:32PM +0200, fabien dvlt wrote:
> Hello,
> 
> After trying 42 connections, 30% of my attempts are failing on
> authentication (bluez 5.47). This happens with multiple (all?) Android
> phones.
> 
> Below are the btmon logs which I am finding interesting after that you
> will find the complete logs.
> 
> For all of my failing connection, I saw that an L2CAP connection
> requests with PSM 0x19 is processed just before 'Encryption Change'
> event. But, for all successful attempts this L2CAP connection request
> is made after "Encryption Change' event.
> So I made a patch to postpone the involved ACL packet after the
> Encryption Change event and now I have 100% of success but it is still
> a little hackish.
> 
> May be this is also related to
> https://www.spinics.net/lists/linux-bluetooth/msg72827.html
> 
> Thank you
> 
> ------------------------------
> 
> > HCI Event: Link Key Request (0x17) plen 6                                                                                                                                                                                                                                                                                                            #195 [hci0] 21.708115
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
> < HCI Command: Link Key Request Reply (0x01|0x000b) plen 22
> 
> 
> 
>                                                            #196 [hci0]
> 21.708397
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Link key: feff6b48c953f119c1579913be0c0f65
> > HCI Event: Command Complete (0x0e) plen 10                                                                                                                                                                                                                                                                                                           #197 [hci0] 21.710115
>       Link Key Request Reply (0x01|0x000b) ncmd 1
>         Status: Success (0x00)
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
> > ACL Data RX: Handle 13 flags 0x02 dlen 12                                                                                                                                                                                                                                                                                                            #198 [hci0] 21.813116
>       L2CAP: Connection Request (0x02) ident 7 len 4
>         PSM: 25 (0x0019)
>         Source CID: 75
> > HCI Event: Encryption Change (0x08) plen 4                                                                                                                                                                                                                                                                                                           #199 [hci0] 21.813155
>         Status: Success (0x00)
>         Handle: 13
>         Encryption: Enabled with AES-CCM (0x02)
> < ACL Data TX: Handle 13 flags 0x00 dlen 16
> 
> 
> 
>                                                            #200 [hci0]
> 21.813256
>       L2CAP: Connection Response (0x03) ident 7 len 8
>         Destination CID: 0
>         Source CID: 75
>         Result: Connection refused - security block (0x0003)
>         Status: No further information available (0x0000)
> 
> ------------------------------
> 
> # COMPLETE BTMON LOGS
> 
> > HCI Event: Connect Request (0x04) plen 10                                                                                                                                                                                                                                                                                                            #152 [hci0] 21.335093
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Class: 0x5a020c
>           Major class: Phone (cellular, cordless, payphone, modem)
>           Minor class: Smart phone
>           Networking (LAN, Ad hoc)
>           Capturing (Scanner, Microphone)
>           Object Transfer (v-Inbox, v-Folder)
>           Telephony (Cordless telephony, Modem, Headset)
>         Link type: ACL (0x01)
> < HCI Command: Accept Connection Request (0x01|0x0009) plen 7
> 
> 
> 
>                                                            #153 [hci0]
> 21.335196
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Role: Master (0x00)
> > HCI Event: Command Status (0x0f) plen 4                                                                                                                                                                                                                                                                                                              #154 [hci0] 21.337107
>       Accept Connection Request (0x01|0x0009) ncmd 1
>         Status: Success (0x00)
> > HCI Event: Role Change (0x12) plen 8                                                                                                                                                                                                                                                                                                                 #155 [hci0] 21.589092
>         Status: Success (0x00)
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Role: Master (0x00)
> > HCI Event: Connect Complete (0x03) plen 11                                                                                                                                                                                                                                                                                                           #156 [hci0] 21.596088
>         Status: Success (0x00)
>         Handle: 13
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Link type: ACL (0x01)
>         Encryption: Disabled (0x00)
> < HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2
> 
> 
> 
>                                                            #157 [hci0]
> 21.596328
>         Handle: 13
> > HCI Event: Command Status (0x0f) plen 4                                                                                                                                                                                                                                                                                                              #158 [hci0] 21.607116
>       Read Remote Supported Features (0x01|0x001b) ncmd 1
>         Status: Success (0x00)
> > HCI Event: Page Scan Repetition Mode Change (0x20) plen 7                                                                                                                                                                                                                                                                                            #159 [hci0] 21.608112
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Page scan repetition mode: R1 (0x01)
> > HCI Event: Max Slots Change (0x1b) plen 3                                                                                                                                                                                                                                                                                                            #160 [hci0] 21.609114
>         Handle: 13
>         Max slots: 5
> > HCI Event: Read Remote Supported Features (0x0b) plen 11                                                                                                                                                                                                                                                                                             #161 [hci0] 21.612116
>         Status: Success (0x00)
>         Handle: 13
>         Features: 0xff 0xfe 0x8f 0xfe 0xd8 0x3f 0x5b 0x87
>           3 slot packets
>           5 slot packets
>           Encryption
>           Slot offset
>           Timing accuracy
>           Role switch
>           Hold mode
>           Sniff mode
>           Power control requests
>           Channel quality driven data rate (CQDDR)
>           SCO link
>           HV2 packets
>           HV3 packets
>           u-law log synchronous data
>           A-law log synchronous data
>           CVSD synchronous data
>           Paging parameter negotiation
>           Power control
>           Transparent synchronous data
>           Broadcast Encryption
>           Enhanced Data Rate ACL 2 Mbps mode
>           Enhanced Data Rate ACL 3 Mbps mode
>           Enhanced inquiry scan
>           Interlaced inquiry scan
>           Interlaced page scan
>           RSSI with inquiry results
>           Extended SCO link (EV3 packets)
>           AFH capable slave
>           AFH classification slave
>           LE Supported (Controller)
>           3-slot Enhanced Data Rate ACL packets
>           5-slot Enhanced Data Rate ACL packets
>           Sniff subrating
>           Pause encryption
>           AFH capable master
>           AFH classification master
>           Enhanced Data Rate eSCO 2 Mbps mode
>           Extended Inquiry Response
>           Simultaneous LE and BR/EDR (Controller)
>           Secure Simple Pairing
>           Encapsulated PDU
>           Non-flushable Packet Boundary Flag
>           Link Supervision Timeout Changed Event
>           Inquiry TX Power Level
>           Enhanced Power Control
>           Extended features
> < HCI Command: Read Remote Extended Features (0x01|0x001c) plen 3
> 
> 
> 
>                                                            #162 [hci0]
> 21.612211
>         Handle: 13
>         Page: 1
> > HCI Event: Command Status (0x0f) plen 4                                                                                                                                                                                                                                                                                                              #163 [hci0] 21.614113
>       Read Remote Extended Features (0x01|0x001c) ncmd 1
>         Status: Success (0x00)
> > ACL Data RX: Handle 13 flags 0x02 dlen 10                                                                                                                                                                                                                                                                                                            #164 [hci0] 21.617110
>       L2CAP: Information Request (0x0a) ident 2 len 2
>         Type: Extended features supported (0x0002)
> > HCI Event: Read Remote Extended Features (0x23) plen 13                                                                                                                                                                                                                                                                                              #165 [hci0] 21.617139
>         Status: Success (0x00)
>         Handle: 13
>         Page: 1/2
>         Features: 0x0f 0x00 0x00 0x00 0x00 0x00 0x00 0x00
>           Secure Simple Pairing (Host Support)
>           LE Supported (Host)
>           Simultaneous LE and BR/EDR (Host)
>           Secure Connections (Host Support)
> < HCI Command: Remote Name Request (0x01|0x0019) plen 10
> 
> 
> 
>                                                            #166 [hci0]
> 21.617258
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Page scan repetition mode: R2 (0x02)
>         Page scan mode: Mandatory (0x00)
>         Clock offset: 0x0000
> < ACL Data TX: Handle 13 flags 0x00 dlen 10
> 
> 
> 
>                                                            #167 [hci0]
> 21.617284
>       L2CAP: Information Request (0x0a) ident 1 len 2
>         Type: Extended features supported (0x0002)
> < ACL Data TX: Handle 13 flags 0x00 dlen 16
> 
> 
> 
>                                                            #168 [hci0]
> 21.617307
>       L2CAP: Information Response (0x0b) ident 2 len 8
>         Type: Extended features supported (0x0002)
>         Result: Success (0x0000)
>         Features: 0x000002b8
>           Enhanced Retransmission Mode
>           Streaming Mode
>           FCS Option
>           Fixed Channels
>           Unicast Connectionless Data Reception
> > HCI Event: Command Status (0x0f) plen 4                                                                                                                                                                                                                                                                                                              #169 [hci0] 21.619110
>       Remote Name Request (0x01|0x0019) ncmd 1
>         Status: Success (0x00)
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #170 [hci0] 21.620114
>         Num handles: 1
>         Handle: 13
>         Count: 1
> > ACL Data RX: Handle 13 flags 0x02 dlen 16                                                                                                                                                                                                                                                                                                            #171 [hci0] 21.622116
>       L2CAP: Information Response (0x0b) ident 1 len 8
>         Type: Extended features supported (0x0002)
>         Result: Success (0x0000)
>         Features: 0x000000b8
>           Enhanced Retransmission Mode
>           Streaming Mode
>           FCS Option
>           Fixed Channels
> < ACL Data TX: Handle 13 flags 0x00 dlen 10
> 
> 
> 
>                                                            #172 [hci0]
> 21.622208
>       L2CAP: Information Request (0x0a) ident 2 len 2
>         Type: Fixed channels supported (0x0003)
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #173 [hci0] 21.626110
>         Num handles: 1
>         Handle: 13
>         Count: 1
> > ACL Data RX: Handle 13 flags 0x02 dlen 10                                                                                                                                                                                                                                                                                                            #174 [hci0] 21.628106
>       L2CAP: Information Request (0x0a) ident 3 len 2
>         Type: Fixed channels supported (0x0003)
> < ACL Data TX: Handle 13 flags 0x00 dlen 20
> 
> 
> 
>                                                            #175 [hci0]
> 21.628386
>       L2CAP: Information Response (0x0b) ident 3 len 12
>         Type: Fixed channels supported (0x0003)
>         Result: Success (0x0000)
>         Channels: 0x0000000000000086
>           L2CAP Signaling (BR/EDR)
>           Connectionless reception
>           Security Manager (BR/EDR)
> > ACL Data RX: Handle 13 flags 0x02 dlen 20                                                                                                                                                                                                                                                                                                            #176 [hci0] 21.636079
>       L2CAP: Information Response (0x0b) ident 2 len 12
>         Type: Fixed channels supported (0x0003)
>         Result: Success (0x0000)
>         Channels: 0x0000000000000082
>           L2CAP Signaling (BR/EDR)
>           Security Manager (BR/EDR)
> > ACL Data RX: Handle 13 flags 0x02 dlen 12                                                                                                                                                                                                                                                                                                            #177 [hci0] 21.638082
>       L2CAP: Connection Request (0x02) ident 4 len 4
>         PSM: 1 (0x0001)
>         Source CID: 74
> @ MGMT Event: Device Connected (0x000b) plen 18
> 
> 
> 
>                                                        {0x0002} [hci0]
> 21.638158
>         BR/EDR Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Flags: 0x00000000
>         Data length: 5
>         Class: 0x5a020c
>           Major class: Phone (cellular, cordless, payphone, modem)
>           Minor class: Smart phone
>           Networking (LAN, Ad hoc)
>           Capturing (Scanner, Microphone)
>           Object Transfer (v-Inbox, v-Folder)
>           Telephony (Cordless telephony, Modem, Headset)
> @ MGMT Event: Device Connected (0x000b) plen 18
> 
> 
> 
>                                                        {0x0001} [hci0]
> 21.638158
>         BR/EDR Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Flags: 0x00000000
>         Data length: 5
>         Class: 0x5a020c
>           Major class: Phone (cellular, cordless, payphone, modem)
>           Minor class: Smart phone
>           Networking (LAN, Ad hoc)
>           Capturing (Scanner, Microphone)
>           Object Transfer (v-Inbox, v-Folder)
>           Telephony (Cordless telephony, Modem, Headset)
> < ACL Data TX: Handle 13 flags 0x00 dlen 16
> 
> 
> 
>                                                            #178 [hci0]
> 21.638233
>       L2CAP: Connection Response (0x03) ident 4 len 8
>         Destination CID: 64
>         Source CID: 74
>         Result: Connection successful (0x0000)
>         Status: No further information available (0x0000)
> < ACL Data TX: Handle 13 flags 0x00 dlen 23
> 
> 
> 
>                                                            #179 [hci0]
> 21.638251
>       L2CAP: Configure Request (0x04) ident 3 len 15
>         Destination CID: 74
>         Flags: 0x0000
>         Option: Retransmission and Flow Control (0x04) [mandatory]
>           Mode: Basic (0x00)
>           TX window size: 0
>           Max transmit: 0
>           Retransmission timeout: 0
>           Monitor timeout: 0
>           Maximum PDU size: 0
> > HCI Event: Remote Name Req Complete (0x07) plen 255                                                                                                                                                                                                                                                                                                  #180 [hci0] 21.643122
>         Status: Success (0x00)
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Name: OnePlus 6
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #181 [hci0] 21.644131
>         Num handles: 1
>         Handle: 13
>         Count: 1
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #182 [hci0] 21.645124
>         Num handles: 1
>         Handle: 13
>         Count: 1
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #183 [hci0] 21.648116
>         Num handles: 1
>         Handle: 13
>         Count: 1
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #184 [hci0] 21.649120
>         Num handles: 1
>         Handle: 13
>         Count: 1
> > ACL Data RX: Handle 13 flags 0x02 dlen 16                                                                                                                                                                                                                                                                                                            #185 [hci0] 21.658113
>       L2CAP: Configure Request (0x04) ident 5 len 8
>         Destination CID: 64
>         Flags: 0x0000
>         Option: Maximum Transmission Unit (0x01) [mandatory]
>           MTU: 672
> < ACL Data TX: Handle 13 flags 0x00 dlen 18
> 
> 
> 
>                                                            #186 [hci0]
> 21.658194
>       L2CAP: Configure Response (0x05) ident 5 len 10
>         Source CID: 74
>         Flags: 0x0000
>         Result: Success (0x0000)
>         Option: Maximum Transmission Unit (0x01) [mandatory]
>           MTU: 672
> > ACL Data RX: Handle 13 flags 0x02 dlen 14                                                                                                                                                                                                                                                                                                            #187 [hci0] 21.659124
>       L2CAP: Configure Response (0x05) ident 3 len 6
>         Source CID: 64
>         Flags: 0x0000
>         Result: Success (0x0000)
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #188 [hci0] 21.661118
>         Num handles: 1
>         Handle: 13
>         Count: 1
> > ACL Data RX: Handle 13 flags 0x02 dlen 28                                                                                                                                                                                                                                                                                                            #189 [hci0] 21.663116
>       Channel: 64 len 24 [PSM 1 mode 0] {chan 0}
>       SDP: Service Search Attribute Request (0x06) tid 0 len 19
>         Search pattern: [len 5]
>           Sequence (6) with 3 bytes [8 extra bits] len 5
>             UUID (3) with 2 bytes [0 extra bits] len 3
>               Audio Sink (0x110b)
>         Max record count: 656
>         Attribute list: [len 11]
>           Sequence (6) with 9 bytes [8 extra bits] len 11
>             Unsigned Integer (1) with 2 bytes [0 extra bits] len 3
>               0x0001
>             Unsigned Integer (1) with 2 bytes [0 extra bits] len 3
>               0x0004
>             Unsigned Integer (1) with 2 bytes [0 extra bits] len 3
>               0x0009
>         Continuation state: 0
> < ACL Data TX: Handle 13 flags 0x00 dlen 58
> 
> 
> 
>                                                            #190 [hci0]
> 21.663513
>       Channel: 74 len 54 [PSM 1 mode 0] {chan 0}
>       SDP: Service Search Attribute Response (0x07) tid 0 len 49
>         Attribute bytes: 46
>           Attribute list: [len 42] {position 0}
>             Attribute: Service Class ID List (0x0001) [len 2]
>               UUID (3) with 2 bytes [0 extra bits] len 3
>                 Audio Sink (0x110b)
>             Attribute: Protocol Descriptor List (0x0004) [len 2]
>               Sequence (6) with 6 bytes [8 extra bits] len 8
>                 UUID (3) with 2 bytes [0 extra bits] len 3
>                   L2CAP (0x0100)
>                 Unsigned Integer (1) with 2 bytes [0 extra bits] len 3
>                   0x0019
>               Sequence (6) with 6 bytes [8 extra bits] len 8
>                 UUID (3) with 2 bytes [0 extra bits] len 3
>                   AVDTP (0x0019)
>                 Unsigned Integer (1) with 2 bytes [0 extra bits] len 3
>                   0x0103
>             Attribute: Bluetooth Profile Descriptor List (0x0009) [len 2]
>               Sequence (6) with 6 bytes [8 extra bits] len 8
>                 UUID (3) with 2 bytes [0 extra bits] len 3
>                   Advanced Audio Distribution (0x110d)
>                 Unsigned Integer (1) with 2 bytes [0 extra bits] len 3
>                   0x0103
>         Continuation state: 0
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #191 [hci0] 21.670123
>         Num handles: 1
>         Handle: 13
>         Count: 1
> > ACL Data RX: Handle 13 flags 0x02 dlen 12                                                                                                                                                                                                                                                                                                            #192 [hci0] 21.682116
>       L2CAP: Disconnection Request (0x06) ident 6 len 4
>         Destination CID: 64
>         Source CID: 74
> < ACL Data TX: Handle 13 flags 0x00 dlen 12
> 
> 
> 
>                                                            #193 [hci0]
> 21.682230
>       L2CAP: Disconnection Response (0x07) ident 6 len 4
>         Destination CID: 64
>         Source CID: 74
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #194 [hci0] 21.685121
>         Num handles: 1
>         Handle: 13
>         Count: 1
> > HCI Event: Link Key Request (0x17) plen 6                                                                                                                                                                                                                                                                                                            #195 [hci0] 21.708115
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
> < HCI Command: Link Key Request Reply (0x01|0x000b) plen 22
> 
> 
> 
>                                                            #196 [hci0]
> 21.708397
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Link key: feff6b48c953f119c1579913be0c0f65
> > HCI Event: Command Complete (0x0e) plen 10                                                                                                                                                                                                                                                                                                           #197 [hci0] 21.710115
>       Link Key Request Reply (0x01|0x000b) ncmd 1
>         Status: Success (0x00)
>         Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
> > ACL Data RX: Handle 13 flags 0x02 dlen 12                                                                                                                                                                                                                                                                                                            #198 [hci0] 21.813116
>       L2CAP: Connection Request (0x02) ident 7 len 4
>         PSM: 25 (0x0019)
>         Source CID: 75
> > HCI Event: Encryption Change (0x08) plen 4                                                                                                                                                                                                                                                                                                           #199 [hci0] 21.813155
>         Status: Success (0x00)
>         Handle: 13
>         Encryption: Enabled with AES-CCM (0x02)
> < ACL Data TX: Handle 13 flags 0x00 dlen 16
> 
> 
> 
>                                                            #200 [hci0]
> 21.813256
>       L2CAP: Connection Response (0x03) ident 7 len 8
>         Destination CID: 0
>         Source CID: 75
>         Result: Connection refused - security block (0x0003)
>         Status: No further information available (0x0000)
> < HCI Command: Read Encryption Key Size (0x05|0x0008) plen 2
> 
> 
> 
>                                                            #201 [hci0]
> 21.813277
>         Handle: 13
> > HCI Event: Command Complete (0x0e) plen 7                                                                                                                                                                                                                                                                                                            #202 [hci0] 21.815118
>       Read Encryption Key Size (0x05|0x0008) ncmd 1
>         Status: Success (0x00)
>         Handle: 13
>         Key size: 16
> > HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                                                                                                                                                                                                 #203 [hci0] 21.816118
>         Num handles: 1
>         Handle: 13
>         Count: 1
> 
> < HCI Command: Disconnect (0x01|0x0006) plen 3
> 
> 
> 
>                                                            #204 [hci0]
> 25.727125
>         Handle: 13
>         Reason: Authentication Failure (0x05)
> > HCI Event: Command Status (0x0f) plen 4                                                                                                                                                                                                                                                                                                              #205 [hci0] 25.729069
>       Disconnect (0x01|0x0006) ncmd 1
>         Status: Success (0x00)
> > HCI Event: Disconnect Complete (0x05) plen 4                                                                                                                                                                                                                                                                                                         #206 [hci0] 25.738073
>         Status: Success (0x00)
>         Handle: 13
>         Reason: Connection Terminated By Local Host (0x16)
> @ MGMT Event: Device Disconnected (0x000c) plen 8
> 
> 
> 
>                                                        {0x0002} [hci0]
> 25.738149
>         BR/EDR Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Reason: Connection terminated by local host (0x02)
> @ MGMT Event: Device Disconnected (0x000c) plen 8
> 
> 
> 
>                                                        {0x0001} [hci0]
> 25.738149
>         BR/EDR Address: 64:A2:F9:XX:XX:XX (OUI 64-A2-F9)
>         Reason: Connection terminated by local host (0x02)



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