When allocating the L2CAP SKB for transmission, provide the upper layers
with a clear distinction on what is the header and what is the body
portion of the SKB.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The SKB for L2CAP sockets are all allocated in a central callback
in the socket support. Instead of having to pass around the socket
priority all the time, assign it to skb->priority when actually
allocating the SKB.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The struct l2cap_ops field should not allow any modifications and thus
it is better declared as const.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

When pairing fails hci_conn refcnt drops below zero. This cause that
ACL link is not disconnected when disconnect timeout fires.

Probably this is because l2cap_conn_del calls l2cap_chan_del for each
channel, and inside l2cap_chan_del conn is dropped. After that loop
hci_chan_del is called which also drops conn.

Anyway, as it is desrcibed in hci_core.h, it is known that refcnt
drops below 0 sometimes and it should be fine. If so, let disconnect
link when hci_conn_timeout fires and refcnt is 0 or below. This patch
does it.

This affects PTS test SM_TC_JW_BV_05_C

Logs from scenario:

[69713.706227] [6515] pair_device:
[69713.706230] [6515] hci_conn_add: hci0 dst 00:1b:dc:06:06:22
[69713.706233] [6515] hci_dev_hold: hci0 orig refcnt 8
[69713.706235] [6515] hci_conn_init_sysfs: conn ffff88021f65a000
[69713.706239] [6515] hci_req_add_ev: hci0 opcode 0x200d plen 25
[69713.706242] [6515] hci_prepare_cmd: skb len 28
[69713.706243] [6515] hci_req_run: length 1
[69713.706248] [6515] hci_conn_hold: hcon ffff88021f65a000 orig refcnt 0
[69713.706251] [6515] hci_dev_put: hci0 orig refcnt 9
[69713.706281] [8909] hci_cmd_work: hci0 cmd_cnt 1 cmd queued 1
[69713.706288] [8909] hci_send_frame: hci0 type 1 len 28
[69713.706290] [8909] hci_send_to_monitor: hdev ffff88021f0c7000 len 28
[69713.706316] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.706382] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.711664] [8909] hci_rx_work: hci0
[69713.711668] [8909] hci_send_to_monitor: hdev ffff88021f0c7000 len 6
[69713.711680] [8909] hci_rx_work: hci0 Event packet
[69713.711683] [8909] hci_cs_le_create_conn: hci0 status 0x00
[69713.711685] [8909] hci_sent_cmd_data: hci0 opcode 0x200d
[69713.711688] [8909] hci_req_cmd_complete: opcode 0x200d status 0x00
[69713.711690] [8909] hci_sent_cmd_data: hci0 opcode 0x200d
[69713.711695] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.711744] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.818875] [8909] hci_rx_work: hci0
[69713.818889] [8909] hci_send_to_monitor: hdev ffff88021f0c7000 len 21
[69713.818913] [8909] hci_rx_work: hci0 Event packet
[69713.818917] [8909] hci_le_conn_complete_evt: hci0 status 0x00
[69713.818922] [8909] hci_send_to_control: len 19
[69713.818927] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.818938] [8909] hci_conn_add_sysfs: conn ffff88021f65a000
[69713.818975] [6450] bt_sock_poll: sock ffff88005e758500, sk ffff88010323b800
[69713.818981] [6515] hci_sock_recvmsg: sock ffff88005e75a080, sk ffff88010323ac00
...
[69713.819021] [8909] hci_dev_hold: hci0 orig refcnt 10
[69713.819025] [8909] l2cap_connect_cfm: hcon ffff88021f65a000 bdaddr 00:1b:dc:06:06:22 status 0
[69713.819028] [8909] hci_chan_create: hci0 hcon ffff88021f65a000
[69713.819031] [8909] l2cap_conn_add: hcon ffff88021f65a000 conn ffff880221005c00 hchan ffff88020d60b1c0
[69713.819034] [8909] l2cap_conn_ready: conn ffff880221005c00
[69713.819036] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.819037] [8909] smp_conn_security: conn ffff880221005c00 hcon ffff88021f65a000 level 0x02
[69713.819039] [8909] smp_chan_create:
[69713.819041] [8909] hci_conn_hold: hcon ffff88021f65a000 orig refcnt 1
[69713.819043] [8909] smp_send_cmd: code 0x01
[69713.819045] [8909] hci_send_acl: hci0 chan ffff88020d60b1c0 flags 0x0000
[69713.819046] [5949] hci_sock_recvmsg: sock ffff8800941a9900, sk ffff88012bf4e800
[69713.819049] [8909] hci_queue_acl: hci0 nonfrag skb ffff88005157c100 len 15
[69713.819055] [5949] hci_sock_recvmsg: sock ffff8800941a9900, sk ffff88012bf4e800
[69713.819057] [8909] l2cap_le_conn_ready:
[69713.819064] [8909] l2cap_chan_create: chan ffff88005ede2c00
[69713.819066] [8909] l2cap_chan_hold: chan ffff88005ede2c00 orig refcnt 1
[69713.819069] [8909] l2cap_sock_init: sk ffff88005ede5800
[69713.819072] [8909] bt_accept_enqueue: parent ffff880160356000, sk ffff88005ede5800
[69713.819074] [8909] __l2cap_chan_add: conn ffff880221005c00, psm 0x00, dcid 0x0004
[69713.819076] [8909] l2cap_chan_hold: chan ffff88005ede2c00 orig refcnt 2
[69713.819078] [8909] hci_conn_hold: hcon ffff88021f65a000 orig refcnt 2
[69713.819080] [8909] smp_conn_security: conn ffff880221005c00 hcon ffff88021f65a000 level 0x01
[69713.819082] [8909] l2cap_sock_ready_cb: sk ffff88005ede5800, parent ffff880160356000
[69713.819086] [8909] le_pairing_complete_cb: status 0
[69713.819091] [8909] hci_tx_work: hci0 acl 10 sco 8 le 0
[69713.819093] [8909] hci_sched_acl: hci0
[69713.819094] [8909] hci_sched_sco: hci0
[69713.819096] [8909] hci_sched_esco: hci0
[69713.819098] [8909] hci_sched_le: hci0
[69713.819099] [8909] hci_chan_sent: hci0
[69713.819101] [8909] hci_chan_sent: chan ffff88020d60b1c0 quote 10
[69713.819104] [8909] hci_sched_le: chan ffff88020d60b1c0 skb ffff88005157c100 len 15 priority 7
[69713.819106] [8909] hci_send_frame: hci0 type 2 len 15
[69713.819108] [8909] hci_send_to_monitor: hdev ffff88021f0c7000 len 15
[69713.819119] [8909] hci_chan_sent: hci0
[69713.819121] [8909] hci_prio_recalculate: hci0
[69713.819123] [8909] process_pending_rx:
[69713.819226] [6450] hci_sock_recvmsg: sock ffff88005e758780, sk ffff88010323d400
...
[69713.822022] [6450] l2cap_sock_accept: sk ffff880160356000 timeo 0
[69713.822024] [6450] bt_accept_dequeue: parent ffff880160356000
[69713.822026] [6450] bt_accept_unlink: sk ffff88005ede5800 state 1
[69713.822028] [6450] l2cap_sock_accept: new socket ffff88005ede5800
[69713.822368] [6450] l2cap_sock_getname: sock ffff8800941ab700, sk ffff88005ede5800
[69713.822375] [6450] l2cap_sock_getsockopt: sk ffff88005ede5800
[69713.822383] [6450] l2cap_sock_getname: sock ffff8800941ab700, sk ffff88005ede5800
[69713.822414] [6450] bt_sock_poll: sock ffff8800941ab700, sk ffff88005ede5800
...
[69713.823255] [6450] l2cap_sock_getname: sock ffff8800941ab700, sk ffff88005ede5800
[69713.823259] [6450] l2cap_sock_getsockopt: sk ffff88005ede5800
[69713.824322] [6450] l2cap_sock_getname: sock ffff8800941ab700, sk ffff88005ede5800
[69713.824330] [6450] l2cap_sock_getsockopt: sk ffff88005ede5800
[69713.825029] [6450] bt_sock_poll: sock ffff88005e758500, sk ffff88010323b800
...
[69713.825187] [6450] l2cap_sock_sendmsg: sock ffff8800941ab700, sk ffff88005ede5800
[69713.825189] [6450] bt_sock_wait_ready: sk ffff88005ede5800
[69713.825192] [6450] l2cap_create_basic_pdu: chan ffff88005ede2c00 len 3
[69713.825196] [6450] l2cap_do_send: chan ffff88005ede2c00, skb ffff880160b0b500 len 7 priority 0
[69713.825199] [6450] hci_send_acl: hci0 chan ffff88020d60b1c0 flags 0x0000
[69713.825201] [6450] hci_queue_acl: hci0 nonfrag skb ffff880160b0b500 len 11
[69713.825210] [8909] hci_tx_work: hci0 acl 9 sco 8 le 0
[69713.825213] [8909] hci_sched_acl: hci0
[69713.825214] [8909] hci_sched_sco: hci0
[69713.825216] [8909] hci_sched_esco: hci0
[69713.825217] [8909] hci_sched_le: hci0
[69713.825219] [8909] hci_chan_sent: hci0
[69713.825221] [8909] hci_chan_sent: chan ffff88020d60b1c0 quote 9
[69713.825223] [8909] hci_sched_le: chan ffff88020d60b1c0 skb ffff880160b0b500 len 11 priority 0
[69713.825225] [8909] hci_send_frame: hci0 type 2 len 11
[69713.825227] [8909] hci_send_to_monitor: hdev ffff88021f0c7000 len 11
[69713.825242] [8909] hci_chan_sent: hci0
[69713.825253] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.825253] [8909] hci_prio_recalculate: hci0
[69713.825292] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.825768] [6450] bt_sock_poll: sock ffff88005e758500, sk ffff88010323b800
...
[69713.866902] [8909] hci_rx_work: hci0
[69713.866921] [8909] hci_send_to_monitor: hdev ffff88021f0c7000 len 7
[69713.866928] [8909] hci_rx_work: hci0 Event packet
[69713.866931] [8909] hci_num_comp_pkts_evt: hci0 num_hndl 1
[69713.866937] [8909] hci_tx_work: hci0 acl 9 sco 8 le 0
[69713.866939] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.866940] [8909] hci_sched_acl: hci0
...
[69713.866944] [8909] hci_sched_le: hci0
[69713.866953] [8909] hci_chan_sent: hci0
[69713.866997] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.867840] [28074] hci_rx_work: hci0
[69713.867844] [28074] hci_send_to_monitor: hdev ffff88021f0c7000 len 7
[69713.867850] [28074] hci_rx_work: hci0 Event packet
[69713.867853] [28074] hci_num_comp_pkts_evt: hci0 num_hndl 1
[69713.867857] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69713.867858] [28074] hci_tx_work: hci0 acl 10 sco 8 le 0
[69713.867860] [28074] hci_sched_acl: hci0
[69713.867861] [28074] hci_sched_sco: hci0
[69713.867862] [28074] hci_sched_esco: hci0
[69713.867863] [28074] hci_sched_le: hci0
[69713.867865] [28074] hci_chan_sent: hci0
[69713.867888] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69714.145661] [8909] hci_rx_work: hci0
[69714.145666] [8909] hci_send_to_monitor: hdev ffff88021f0c7000 len 10
[69714.145676] [8909] hci_rx_work: hci0 ACL data packet
[69714.145679] [8909] hci_acldata_packet: hci0 len 6 handle 0x002d flags 0x0002
[69714.145681] [8909] hci_conn_enter_active_mode: hcon ffff88021f65a000 mode 0
[69714.145683] [8909] l2cap_recv_acldata: conn ffff880221005c00 len 6 flags 0x2
[69714.145693] [8909] l2cap_recv_frame: len 2, cid 0x0006
[69714.145696] [8909] hci_send_to_control: len 14
[69714.145710] [8909] smp_chan_destroy:
[69714.145713] [8909] pairing_complete: status 3
[69714.145714] [8909] cmd_complete: sock ffff88010323ac00
[69714.145717] [8909] hci_conn_drop: hcon ffff88021f65a000 orig refcnt 3
[69714.145719] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69714.145720] [6450] bt_sock_poll: sock ffff88005e758500, sk ffff88010323b800
[69714.145722] [6515] hci_sock_recvmsg: sock ffff88005e75a080, sk ffff88010323ac00
[69714.145724] [6450] bt_sock_poll: sock ffff8801db6b4f00, sk ffff880160351c00
...
[69714.145735] [6515] hci_sock_recvmsg: sock ffff88005e75a080, sk ffff88010323ac00
[69714.145737] [8909] hci_conn_drop: hcon ffff88021f65a000 orig refcnt 2
[69714.145739] [8909] l2cap_conn_del: hcon ffff88021f65a000 conn ffff880221005c00, err 13
[69714.145740] [6450] bt_sock_poll: sock ffff8801db6b5400, sk ffff88021e775000
[69714.145743] [6450] bt_sock_poll: sock ffff8801db6b5e00, sk ffff880160356000
[69714.145744] [8909] l2cap_chan_hold: chan ffff88005ede2c00 orig refcnt 3
[69714.145746] [6450] bt_sock_poll: sock ffff8800941ab700, sk ffff88005ede5800
[69714.145748] [8909] l2cap_chan_del: chan ffff88005ede2c00, conn ffff880221005c00, err 13
[69714.145749] [8909] l2cap_chan_put: chan ffff88005ede2c00 orig refcnt 4
[69714.145751] [8909] hci_conn_drop: hcon ffff88021f65a000 orig refcnt 1
[69714.145754] [6450] bt_sock_poll: sock ffff8800941ab700, sk ffff88005ede5800
[69714.145756] [8909] l2cap_chan_put: chan ffff88005ede2c00 orig refcnt 3
[69714.145759] [8909] hci_chan_del: hci0 hcon ffff88021f65a000 chan ffff88020d60b1c0
[69714.145766] [5949] hci_sock_recvmsg: sock ffff8800941a9680, sk ffff88012bf4d000
[69714.145787] [6515] hci_sock_release: sock ffff88005e75a080 sk ffff88010323ac00
[69714.146002] [6450] hci_sock_recvmsg: sock ffff88005e758780, sk ffff88010323d400
[69714.150795] [6450] l2cap_sock_release: sock ffff8800941ab700, sk ffff88005ede5800
[69714.150799] [6450] l2cap_sock_shutdown: sock ffff8800941ab700, sk ffff88005ede5800
[69714.150802] [6450] l2cap_chan_close: chan ffff88005ede2c00 state BT_CLOSED
[69714.150805] [6450] l2cap_sock_kill: sk ffff88005ede5800 state BT_CLOSED
[69714.150806] [6450] l2cap_chan_put: chan ffff88005ede2c00 orig refcnt 2
[69714.150808] [6450] l2cap_sock_destruct: sk ffff88005ede5800
[69714.150809] [6450] l2cap_chan_put: chan ffff88005ede2c00 orig refcnt 1
[69714.150811] [6450] l2cap_chan_destroy: chan ffff88005ede2c00
[69714.150970] [6450] bt_sock_poll: sock ffff88005e758500, sk ffff88010323b800
...
[69714.151991] [8909] hci_conn_drop: hcon ffff88021f65a000 orig refcnt 0
[69716.150339] [8909] hci_conn_timeout: hcon ffff88021f65a000 state BT_CONNECTED, refcnt -1
Signed-off-by: NLukasz Rymanowski <lukasz.rymanowski@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

If we need an MITM protected connection but the local and remote IO
capabilities cannot provide it we should reject the pairing attempt in
the appropriate way. This patch adds the missing checks for such a
situation to the smp_cmd_pairing_req() and smp_cmd_pairing_rsp()
functions.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

We'll need to do authentication method lookups from more than one place,
so refactor the lookup into its own function.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

When we receive a pairing request or an internal request to start
pairing we shouldn't blindly overwrite the existing pending_sec_level
value as that may actually be higher than the new one. This patch fixes
the SMP code to only overwrite the value in case the new one is higher
than the old.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

Kernel supports SMP Security Request so don't block increasing security
when we are slave.
Signed-off-by: NMarcin Kraglak <marcin.kraglak@tieto.com>
Acked-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

The SMP code expects hdev to be unlocked since e.g. crypto functions
will try to (re)lock it. Therefore, we need to release the lock before
calling into smp.c from mgmt.c. Without this we risk a deadlock whenever
the smp_user_confirm_reply() function is called.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Tested-by: NLukasz Rymanowski <lukasz.rymanowski@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

A deadlock occurs when PDU containing invalid SMP opcode is received on
Security Manager Channel over LE link and conn->pending_rx_work worker
has not run yet.

When LE link is created l2cap_conn_ready() is called and before
returning it schedules conn->pending_rx_work worker to hdev->workqueue.
Incoming data to SMP fixed channel is handled by l2cap_recv_frame()
which calls smp_sig_channel() to handle the SMP PDU. If
smp_sig_channel() indicates failure l2cap_conn_del() is called to delete
the connection. When deleting the connection, l2cap_conn_del() purges
the pending_rx queue and calls flush_work() to wait for the
pending_rx_work worker to complete.

Since incoming data is handled by a worker running from the same
workqueue as the pending_rx_work is being scheduled on, we will deadlock
on waiting for pending_rx_work to complete.

This patch fixes the deadlock by calling cancel_work_sync() instead of
flush_work().
Signed-off-by: NJukka Taimisto <jtt@codenomicon.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

When cleaning up the HCI state as part of the power-off procedure we can
reuse the hci_stop_discovery() function instead of explicitly sending
HCI command related to discovery. The added benefit of this is that it
takes care of canceling name resolving and inquiry which were not
previously covered by the code.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

We'll need to reuse the same logic for stopping discovery also when
cleaning up HCI state when powering off. This patch refactors the code
out to its own function that can later (in a subsequent patch) be used
also for the power off case.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

When inquiry is canceled through the HCI_Cancel_Inquiry command there is
no Inquiry Complete event generated. Instead, all we get is the command
complete for the HCI_Inquiry_Cancel command. This means that we must
call the hci_discovery_set_state() function from the respective command
complete handler in order to ensure that user space knows the correct
discovery state.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

When we store the STK in slave role we should set the correct
authentication information for it. If the pairing is producing a HIGH
security level the STK is considered authenticated, and otherwise it's
considered unauthenticated. This patch fixes the value passed to the
hci_add_ltk() function when adding the STK on the slave side.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Tested-by: NMarcin Kraglak <marcin.kraglak@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

When responding to an IO capability request when we're the initiators of
the pairing we will not yet have the remote IO capability information.
Since the conn->auth_type variable is treated as an "absolute"
requirement instead of a hint of what's needed later in the user
confirmation request handler it's important that it doesn't have the
MITM bit set if there's any chance that the remote device doesn't have
the necessary IO capabilities.

This patch adds a clarifying comment so that conn->auth_type is left
untouched in this scenario.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

From the Bluetooth Core Specification 4.1 page 1958:

"if both devices have set the Authentication_Requirements parameter to
one of the MITM Protection Not Required options, authentication stage 1
shall function as if both devices set their IO capabilities to
DisplayOnly (e.g., Numeric comparison with automatic confirmation on
both devices)"

So far our implementation has done user confirmation for all just-works
cases regardless of the MITM requirements, however following the
specification to the word means that we should not be doing confirmation
when neither side has the MITM flag set.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Tested-by: NSzymon Janc <szymon.janc@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

The conn->link_key variable tracks the type of link key in use. It is
set whenever we respond to a link key request as well as when we get a
link key notification event.

These two events do not however always guarantee that encryption is
enabled: getting a link key request and responding to it may only mean
that the remote side has requested authentication but not encryption. On
the other hand, the encrypt change event is a certain guarantee that
encryption is enabled. The real encryption state is already tracked in
the conn->link_mode variable through the HCI_LM_ENCRYPT bit.

This patch fixes a check for encryption in the hci_conn_auth function to
use the proper conn->link_mode value and thereby eliminates the chance
of a false positive result.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

The src_type member of struct hci_conn should always reflect the address
type of the src_member. It should never be overridden. There is already
code in place in the command status handler of HCI_LE_Create_Connection
to copy the right initiator address into conn->init_addr_type.

Without this patch, if privacy is enabled, we will send the wrong
address type in the SMP identity address information PDU (it'll e.g.
contain our public address but a random address type).
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

There are several instances where a pskb_copy or __pskb_copy is
immediately followed by an skb_clone.

Add a couple of new functions to allow the copy skb to be allocated
from the fclone cache and thus speed up subsequent skb_clone calls.

Cc: Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Marek Lindner <mareklindner@neomailbox.ch>
Cc: Simon Wunderlich <sw@simonwunderlich.de>
Cc: Antonio Quartulli <antonio@meshcoding.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: Arvid Brodin <arvid.brodin@alten.se>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Cc: Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Jon Maloy <jon.maloy@ericsson.com>
Cc: Allan Stephens <allan.stephens@windriver.com>
Cc: Andrew Hendry <andrew.hendry@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Reviewed-by: NChristoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: NOctavian Purdila <octavian.purdila@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

-[0x01 Introduction

We have found a programming error causing a deadlock in Bluetooth subsystem
of Linux kernel. The problem is caused by missing release_sock() call when
L2CAP connection creation fails due full accept queue.

The issue can be reproduced with 3.15-rc5 kernel and is also present in
earlier kernels.

-[0x02 Details

The problem occurs when multiple L2CAP connections are created to a PSM which
contains listening socket (like SDP) and left pending, for example,
configuration (the underlying ACL link is not disconnected between
connections).

When L2CAP connection request is received and listening socket is found the
l2cap_sock_new_connection_cb() function (net/bluetooth/l2cap_sock.c) is called.
This function locks the 'parent' socket and then checks if the accept queue
is full.

1178         lock_sock(parent);
1179
1180         /* Check for backlog size */
1181         if (sk_acceptq_is_full(parent)) {
1182                 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1183                 return NULL;
1184         }

If case the accept queue is full NULL is returned, but the 'parent' socket
is not released. Thus when next L2CAP connection request is received the code
blocks on lock_sock() since the parent is still locked.

Also note that for connections already established and waiting for
configuration to complete a timeout will occur and l2cap_chan_timeout()
(net/bluetooth/l2cap_core.c) will be called. All threads calling this
function will also be blocked waiting for the channel mutex since the thread
which is waiting on lock_sock() alread holds the channel mutex.

We were able to reproduce this by sending continuously L2CAP connection
request followed by disconnection request containing invalid CID. This left
the created connections pending configuration.

After the deadlock occurs it is impossible to kill bluetoothd, btmon will not
get any more data etc. requiring reboot to recover.

-[0x03 Fix

Releasing the 'parent' socket when l2cap_sock_new_connection_cb() returns NULL
seems to fix the issue.
Signed-off-by: NJukka Taimisto <jtt@codenomicon.com>
Reported-by: NTommi Mäkilä <tmakila@codenomicon.com>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Cc: stable@vger.kernel.org

When checking whether a legacy link key provides at least HIGH security
level we also need to check for FIPS level which is one step above HIGH.
This patch fixes a missing check in the hci_link_key_request_evt()
function.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

Due to recent changes to the way that the MITM requirement is set for
outgoing pairing attempts we can no longer rely on the hcon->auth_type
variable (which is actually good since it was formed from BR/EDR
concepts that don't really exist for SMP).

To match the logic that BR/EDR now uses simply rely on the local IO
capability and/or needed security level to set the MITM requirement for
outgoing pairing requests.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

Default values for various channel settings were missing. This
way channel users do not need to set default values themselves.
Signed-off-by: NJukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The universal/local bit handling was incorrectly done in the code.

So when setting EUI address from BD address we do this:
- If BD address type is PUBLIC, then we clear the universal bit
  in EUI address. If the address type is RANDOM, then the universal
  bit is set (BT 6lowpan draft chapter 3.2.2)
- After this we invert the universal/local bit according to RFC 2464

When figuring out BD address we do the reverse:
- Take EUI address from stateless IPv6 address, invert the
  universal/local bit according to RFC 2464
- If universal bit is 1 in this modified EUI address, then address
  type is set to RANDOM, otherwise it is PUBLIC

Note that 6lowpan_iphc.[ch] does the final toggling of U/L bit
before sending or receiving the network packet.
Signed-off-by: NJukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

When checking whether we need to request authentication or not we should
include HCI_SECURITY_FIPS to the levels that always need authentication.
This patch fixes check for it in the hci_outgoing_auth_needed()
function.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

In case there are new LTK types in the future we shouldn't just blindly
assume that != MGMT_LTK_UNAUTHENTICATED means that the key is
authenticated. This patch adds explicit checks for each allowed key type
in the form of a switch statement and skips any key which has an unknown
value.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

On the mgmt level we have a key type parameter which currently accepts
two possible values: 0x00 for unauthenticated and 0x01 for
authenticated. However, in the internal struct smp_ltk representation we
have an explicit "authenticated" boolean value.

To make this distinction clear, add defines for the possible mgmt values
and do conversion to and from the internal authenticated value.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

Now that smp_confirm() is called "inline" we can have it return a
response code and have the sending of it be done in the shared place for
command handlers. One exception is when we're entering smp.c from mgmt.c
when user space responds to authentication, in which case we still need
our own code to call smp_failure().
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

Since we're now calling smp_random() "inline" we can have it directly
return a response code and have the shared command handler send the
response.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

There's no reason to have "smp" in this variable name since it is
already part of the SMP struct which provides sufficient context.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

When the SMP code was initially created (mid-2011) parts of the
Bluetooth subsystem were still not converted to use workqueues. This
meant that the crypto calls, which could sleep, couldn't be called
directly. Because of this the "confirm" and "random" work structs were
introduced.

These days the entire Bluetooth subsystem runs through workqueues which
makes these structs unnecessary. This patch removes them and converts
the calls to queue them to use direct function calls instead.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

There is no reason to have the initial local value conditional to
whether the remote value has bonding set or not. We can either way start
off with the value we received.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

There are no users of the smp_chan struct outside of smp.c so move it
away from smp.h. The addition of the l2cap.h include to hci_core.c,
hci_conn.c and mgmt.c is something that should have been there already
previously to avoid warnings of undeclared struct l2cap_conn, but the
compiler warning was apparently shadowed away by the mention of
l2cap_conn in the struct smp_chan definition.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

conn_info_age value is calculated in ms, so need to be converted to
jiffies.
Signed-off-by: NAndrzej Kaczmarek <andrzej.kaczmarek@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch adds support for max_tx_power in Get Connection Information
request. Value is read only once for given connection and then always
returned in response as parameter.
Signed-off-by: NAndrzej Kaczmarek <andrzej.kaczmarek@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch adds support to store local maximum TX power level for
connection when reply for HCI_Read_Transmit_Power_Level is received.
Signed-off-by: NAndrzej Kaczmarek <andrzej.kaczmarek@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

TX power for LE links is immutable thus we do not need to query for it
if already have value.
Signed-off-by: NAndrzej Kaczmarek <andrzej.kaczmarek@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch adds support for Get Connection Information mgmt command
which can be used to query for information about connection, i.e. RSSI
and local TX power level.

In general values cached in hci_conn are returned as long as they are
considered valid, i.e. do not exceed age limit set in hdev. This limit
is calculated as random value between min/max values to avoid client
trying to guess when to poll for updated information.
Signed-off-by: NAndrzej Kaczmarek <andrzej.kaczmarek@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch adds conn_info_min_age and conn_info_max_age parameters to
debugfs which determine lifetime of connection information. Actual
lifetime will be random value between min and max age.

Default values for min and max age are 1000ms and 3000ms respectively.
Signed-off-by: NAndrzej Kaczmarek <andrzej.kaczmarek@tieto.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

0466 was probably meant to be 0644, there's no reason why everyone
except root could write there.
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org