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Claudio Takahasi cf151ce186 Bluetooth: Fix removing Long Term Key 
commit 5981a8821b upstream.

This patch fixes authentication failure on LE link re-connection when
BlueZ acts as slave (peripheral). LTK is removed from the internal list
after its first use causing PIN or Key missing reply when re-connecting
the link. The LE Long Term Key Request event indicates that the master
is attempting to encrypt or re-encrypt the link.

Pre-condition: BlueZ host paired and running as slave.
How to reproduce(master):

  1) Establish an ACL LE encrypted link
  2) Disconnect the link
  3) Try to re-establish the ACL LE encrypted link (fails)

> HCI Event: LE Meta Event (0x3e) plen 19
      LE Connection Complete (0x01)
        Status: Success (0x00)
        Handle: 64
        Role: Slave (0x01)
...
@ Device Connected: 00:02:72:DC:29:C9 (1) flags 0x0000
> HCI Event: LE Meta Event (0x3e) plen 13
      LE Long Term Key Request (0x05)
        Handle: 64
        Random number: 875be18439d9aa37
        Encryption diversifier: 0x76ed
< HCI Command: LE Long Term Key Request Reply (0x08|0x001a) plen 18
        Handle: 64
        Long term key: 2aa531db2fce9f00a0569c7d23d17409
> HCI Event: Command Complete (0x0e) plen 6
      LE Long Term Key Request Reply (0x08|0x001a) ncmd 1
        Status: Success (0x00)
        Handle: 64
> HCI Event: Encryption Change (0x08) plen 4
        Status: Success (0x00)
        Handle: 64
        Encryption: Enabled with AES-CCM (0x01)
...
@ Device Disconnected: 00:02:72:DC:29:C9 (1) reason 3
< HCI Command: LE Set Advertise Enable (0x08|0x000a) plen 1
        Advertising: Enabled (0x01)
> HCI Event: Command Complete (0x0e) plen 4
      LE Set Advertise Enable (0x08|0x000a) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 19
      LE Connection Complete (0x01)
        Status: Success (0x00)
        Handle: 64
        Role: Slave (0x01)
...
@ Device Connected: 00:02:72:DC:29:C9 (1) flags 0x0000
> HCI Event: LE Meta Event (0x3e) plen 13
      LE Long Term Key Request (0x05)
        Handle: 64
        Random number: 875be18439d9aa37
        Encryption diversifier: 0x76ed
< HCI Command: LE Long Term Key Request Neg Reply (0x08|0x001b) plen 2
        Handle: 64
> HCI Event: Command Complete (0x0e) plen 6
      LE Long Term Key Request Neg Reply (0x08|0x001b) ncmd 1
        Status: Success (0x00)
        Handle: 64
> HCI Event: Disconnect Complete (0x05) plen 4
        Status: Success (0x00)
        Handle: 64
        Reason: Authentication Failure (0x05)
@ Device Disconnected: 00:02:72:DC:29:C9 (1) reason 0

Signed-off-by: Claudio Takahasi <claudio.takahasi@openbossa.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2014-04-26 17:19:04 -07:00
..
bnep net/*: Fix FSF address in file headers 2013-12-06 12:37:57 -05:00
cmtp Bluetooth: Access CMTP session addresses through L2CAP channel 2013-10-13 20:00:30 +03:00
hidp HID: Bluetooth: hidp: make sure input buffers are big enough 2014-02-17 21:17:55 +01:00
rfcomm Bluetooth: Remove rfcomm_carrier_raised() 2014-01-06 13:51:45 -08:00
6lowpan.c Bluetooth: Fix 6loWPAN peer lookup 2014-01-07 11:32:15 -02:00
6lowpan.h Bluetooth: Enable 6LoWPAN support for BT LE devices 2013-12-11 12:57:55 -08:00
Kconfig net: move 6lowpan compression code to separate module 2014-01-15 15:36:38 -08:00
Makefile Bluetooth: remove direct compilation of 6lowpan_iphc.c 2014-01-17 19:13:49 -08:00
a2mp.c Bluetooth: Ignore A2MP data on non-BR/EDR links 2013-10-16 01:41:13 -07:00
a2mp.h Bluetooth: Move a2mp.h header file into net/bluetooth/ 2013-10-11 00:10:05 +02:00
af_bluetooth.c Bluetooth: Increase minor version of core module 2013-12-07 21:29:43 +04:00
amp.c Bluetooth: Remove l2cap_conn->dst usage from AMP manager 2013-10-13 17:43:32 +03:00
amp.h Bluetooth: Move amp.h header file into net/bluetooth/ 2013-10-11 00:10:03 +02:00
hci_conn.c Bluetooth: Expose debugfs settings for LE connection interval 2013-10-19 18:56:54 +03:00
hci_core.c Bluetooth: Add quirk for disabling Delete Stored Link Key command 2014-01-04 20:10:40 +02:00
hci_event.c Bluetooth: Fix removing Long Term Key 2014-04-26 17:19:04 -07:00
hci_sock.c Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth 2013-12-18 13:46:08 -05:00
hci_sysfs.c Bluetooth: Remove bus attribute in favor of hierarchy 2013-10-19 16:25:55 +03:00
l2cap_core.c Bluetooth: Enable 6LoWPAN support for BT LE devices 2013-12-11 12:57:55 -08:00
l2cap_sock.c net: add build-time checks for msg->msg_name size 2014-01-18 23:04:16 -08:00
lib.c
…
mgmt.c Bluetooth: Add an extra check in mgmt_device_disconnected() 2013-12-04 11:09:03 -02:00
sco.c net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
smp.c Bluetooth: Add smp_sufficient_security helper function 2013-12-05 07:05:33 -08:00
smp.h Bluetooth: Add smp_sufficient_security helper function 2013-12-05 07:05:33 -08:00