1 /******************************************************************************
2 *
3 * Copyright 1999-2012 Broadcom Corporation
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18
19 /******************************************************************************
20 *
21 * This file contains L2CAP internal definitions
22 *
23 ******************************************************************************/
24 #ifndef L2C_INT_H
25 #define L2C_INT_H
26
27 #include <stdbool.h>
28 #include <string>
29
30 #include "bt_common.h"
31 #include "btm_api.h"
32 #include "btm_ble_api.h"
33 #include "l2c_api.h"
34 #include "l2cap_acl_interface.h"
35 #include "l2cap_controller_interface.h"
36 #include "l2cap_hci_link_interface.h"
37 #include "l2cap_security_interface.h"
38 #include "l2cdefs.h"
39 #include "osi/include/alarm.h"
40 #include "osi/include/fixed_queue.h"
41 #include "osi/include/list.h"
42 #include "stack/include/hci_error_code.h"
43 #include "types/hci_role.h"
44
45 #define L2CAP_MIN_MTU 48 /* Minimum acceptable MTU is 48 bytes */
46
47 constexpr uint16_t L2CAP_CREDIT_BASED_MIN_MTU = 64;
48 constexpr uint16_t L2CAP_CREDIT_BASED_MIN_MPS = 64;
49 #define L2CAP_NO_IDLE_TIMEOUT 0xFFFF
50
51 /*
52 * Timeout values (in milliseconds).
53 */
54 #define L2CAP_LINK_ROLE_SWITCH_TIMEOUT_MS (10 * 1000) /* 10 seconds */
55 #define L2CAP_LINK_CONNECT_TIMEOUT_MS (60 * 1000) /* 30 seconds */
56 #define L2CAP_LINK_CONNECT_EXT_TIMEOUT_MS (120 * 1000) /* 120 seconds */
57 #define L2CAP_LINK_FLOW_CONTROL_TIMEOUT_MS (2 * 1000) /* 2 seconds */
58 #define L2CAP_LINK_DISCONNECT_TIMEOUT_MS (30 * 1000) /* 30 seconds */
59 #define L2CAP_CHNL_CONNECT_TIMEOUT_MS (60 * 1000) /* 60 seconds */
60 #define L2CAP_CHNL_CONNECT_EXT_TIMEOUT_MS (120 * 1000) /* 120 seconds */
61 #define L2CAP_CHNL_CFG_TIMEOUT_MS (30 * 1000) /* 30 seconds */
62 #define L2CAP_CHNL_DISCONNECT_TIMEOUT_MS (10 * 1000) /* 10 seconds */
63 #define L2CAP_DELAY_CHECK_SM4_TIMEOUT_MS (2 * 1000) /* 2 seconds */
64 #define L2CAP_WAIT_INFO_RSP_TIMEOUT_MS (3 * 1000) /* 3 seconds */
65 #define L2CAP_BLE_LINK_CONNECT_TIMEOUT_MS (30 * 1000) /* 30 seconds */
66 #define L2CAP_FCR_ACK_TIMEOUT_MS 200 /* 200 milliseconds */
67
68 /* Define the possible L2CAP channel states. The names of
69 * the states may seem a bit strange, but they are taken from
70 * the Bluetooth specification.
71 */
72 typedef enum {
73 CST_CLOSED, /* Channel is in closed state */
74 CST_ORIG_W4_SEC_COMP, /* Originator waits security clearence */
75 CST_TERM_W4_SEC_COMP, /* Acceptor waits security clearence */
76 CST_W4_L2CAP_CONNECT_RSP, /* Waiting for peer conenct response */
77 CST_W4_L2CA_CONNECT_RSP, /* Waiting for upper layer connect rsp */
78 CST_CONFIG, /* Negotiating configuration */
79 CST_OPEN, /* Data transfer state */
80 CST_W4_L2CAP_DISCONNECT_RSP, /* Waiting for peer disconnect rsp */
81 CST_W4_L2CA_DISCONNECT_RSP /* Waiting for upper layer disc rsp */
82 } tL2C_CHNL_STATE;
83
84 #define CASE_RETURN_TEXT(code) \
85 case code: \
86 return #code
87
channel_state_text(const tL2C_CHNL_STATE & state)88 inline std::string channel_state_text(const tL2C_CHNL_STATE& state) {
89 switch (state) {
90 CASE_RETURN_TEXT(CST_CLOSED);
91 CASE_RETURN_TEXT(CST_ORIG_W4_SEC_COMP);
92 CASE_RETURN_TEXT(CST_TERM_W4_SEC_COMP);
93 CASE_RETURN_TEXT(CST_W4_L2CAP_CONNECT_RSP);
94 CASE_RETURN_TEXT(CST_W4_L2CA_CONNECT_RSP);
95 CASE_RETURN_TEXT(CST_CONFIG);
96 CASE_RETURN_TEXT(CST_OPEN);
97 CASE_RETURN_TEXT(CST_W4_L2CAP_DISCONNECT_RSP);
98 CASE_RETURN_TEXT(CST_W4_L2CA_DISCONNECT_RSP);
99 default:
100 return std::string("UNKNOWN[%hhu]", state);
101 }
102 }
103 #undef CASE_RETURN_TEXT
104
105 /* Define the possible L2CAP link states
106 */
107 typedef enum {
108 LST_DISCONNECTED,
109 LST_CONNECT_HOLDING,
110 LST_CONNECTING_WAIT_SWITCH,
111 LST_CONNECTING,
112 LST_CONNECTED,
113 LST_DISCONNECTING
114 } tL2C_LINK_STATE;
115
link_state_text(const tL2C_LINK_STATE & state)116 inline std::string link_state_text(const tL2C_LINK_STATE& state) {
117 switch (state) {
118 case LST_DISCONNECTED:
119 return std::string("LST_DISCONNECTED");
120 case LST_CONNECT_HOLDING:
121 return std::string("LST_CONNECT_HOLDING");
122 case LST_CONNECTING_WAIT_SWITCH:
123 return std::string("LST_CONNECTING_WAIT_SWITCH");
124 case LST_CONNECTING:
125 return std::string("LST_CONNECTING");
126 case LST_CONNECTED:
127 return std::string("LST_CONNECTED");
128 case LST_DISCONNECTING:
129 return std::string("LST_DISCONNECTING");
130 default:
131 return std::string("UNKNOWN");
132 }
133 }
134
135 /* Define input events to the L2CAP link and channel state machines. The names
136 * of the events may seem a bit strange, but they are taken from
137 * the Bluetooth specification.
138 */
139 typedef enum : uint16_t {
140 /* Lower layer */
141 L2CEVT_LP_CONNECT_CFM = 0, /* connect confirm */
142 L2CEVT_LP_CONNECT_CFM_NEG = 1, /* connect confirm (failed) */
143 L2CEVT_LP_CONNECT_IND = 2, /* connect indication */
144 L2CEVT_LP_DISCONNECT_IND = 3, /* disconnect indication */
145
146 /* Security */
147 L2CEVT_SEC_COMP = 7, /* cleared successfully */
148 L2CEVT_SEC_COMP_NEG = 8, /* procedure failed */
149
150 /* Peer connection */
151 L2CEVT_L2CAP_CONNECT_REQ = 10, /* request */
152 L2CEVT_L2CAP_CONNECT_RSP = 11, /* response */
153 L2CEVT_L2CAP_CONNECT_RSP_PND = 12, /* response pending */
154 L2CEVT_L2CAP_CONNECT_RSP_NEG = 13, /* response (failed) */
155
156 /* Peer configuration */
157 L2CEVT_L2CAP_CONFIG_REQ = 14, /* request */
158 L2CEVT_L2CAP_CONFIG_RSP = 15, /* response */
159 L2CEVT_L2CAP_CONFIG_RSP_NEG = 16, /* response (failed) */
160
161 L2CEVT_L2CAP_DISCONNECT_REQ = 17, /* Peer disconnect request */
162 L2CEVT_L2CAP_DISCONNECT_RSP = 18, /* Peer disconnect response */
163 L2CEVT_L2CAP_INFO_RSP = 19, /* Peer information response */
164 L2CEVT_L2CAP_DATA = 20, /* Peer data */
165
166 /* Upper layer */
167 L2CEVT_L2CA_CONNECT_REQ = 21, /* connect request */
168 L2CEVT_L2CA_CONNECT_RSP = 22, /* connect response */
169 L2CEVT_L2CA_CONNECT_RSP_NEG = 23, /* connect response (failed)*/
170 L2CEVT_L2CA_CONFIG_REQ = 24, /* config request */
171 L2CEVT_L2CA_CONFIG_RSP = 25, /* config response */
172 L2CEVT_L2CA_DISCONNECT_REQ = 27, /* disconnect request */
173 L2CEVT_L2CA_DISCONNECT_RSP = 28, /* disconnect response */
174 L2CEVT_L2CA_DATA_READ = 29, /* data read */
175 L2CEVT_L2CA_DATA_WRITE = 30, /* data write */
176
177 L2CEVT_TIMEOUT = 32, /* Timeout */
178 L2CEVT_SEC_RE_SEND_CMD = 33, /* btm_sec has enough info to proceed */
179
180 L2CEVT_ACK_TIMEOUT = 34, /* RR delay timeout */
181
182 L2CEVT_L2CA_SEND_FLOW_CONTROL_CREDIT = 35, /* Upper layer credit packet \
183 */
184 /* Peer credit based connection */
185 L2CEVT_L2CAP_RECV_FLOW_CONTROL_CREDIT = 36, /* credit packet */
186 L2CEVT_L2CAP_CREDIT_BASED_CONNECT_REQ =
187 37, /* credit based connection request */
188 L2CEVT_L2CAP_CREDIT_BASED_CONNECT_RSP =
189 38, /* accepted credit based connection */
190 L2CEVT_L2CAP_CREDIT_BASED_CONNECT_RSP_NEG =
191 39, /* rejected credit based connection */
192 L2CEVT_L2CAP_CREDIT_BASED_RECONFIG_REQ =
193 40, /* credit based reconfig request*/
194 L2CEVT_L2CAP_CREDIT_BASED_RECONFIG_RSP =
195 41, /* credit based reconfig response */
196
197 /* Upper layer credit based connection */
198 L2CEVT_L2CA_CREDIT_BASED_CONNECT_REQ = 42, /* connect request */
199 L2CEVT_L2CA_CREDIT_BASED_CONNECT_RSP = 43, /* connect response */
200 L2CEVT_L2CA_CREDIT_BASED_CONNECT_RSP_NEG = 44, /* connect response (failed)*/
201 L2CEVT_L2CA_CREDIT_BASED_RECONFIG_REQ = 45, /* reconfig request */
202 } tL2CEVT;
203
204 /* Constants for LE Dynamic PSM values */
205 #define LE_DYNAMIC_PSM_START 0x0080
206 #define LE_DYNAMIC_PSM_END 0x00FF
207 #define LE_DYNAMIC_PSM_RANGE (LE_DYNAMIC_PSM_END - LE_DYNAMIC_PSM_START + 1)
208
209 /* Return values for l2cu_process_peer_cfg_req() */
210 #define L2CAP_PEER_CFG_UNACCEPTABLE 0
211 #define L2CAP_PEER_CFG_OK 1
212 #define L2CAP_PEER_CFG_DISCONNECT 2
213
214 /* eL2CAP option constants */
215 /* Min retransmission timeout if no flush timeout or PBF */
216 #define L2CAP_MIN_RETRANS_TOUT 2000
217 /* Min monitor timeout if no flush timeout or PBF */
218 #define L2CAP_MIN_MONITOR_TOUT 12000
219
220 #define L2CAP_MAX_FCR_CFG_TRIES 2 /* Config attempts before disconnecting */
221
222 typedef uint8_t tL2C_BLE_FIXED_CHNLS_MASK;
223
224 typedef struct {
225 uint8_t next_tx_seq; /* Next sequence number to be Tx'ed */
226 uint8_t last_rx_ack; /* Last sequence number ack'ed by the peer */
227 uint8_t next_seq_expected; /* Next peer sequence number expected */
228 uint8_t last_ack_sent; /* Last peer sequence number ack'ed */
229 uint8_t num_tries; /* Number of retries to send a packet */
230 uint8_t max_held_acks; /* Max acks we can hold before sending */
231
232 bool remote_busy; /* true if peer has flowed us off */
233
234 bool rej_sent; /* Reject was sent */
235 bool srej_sent; /* Selective Reject was sent */
236 bool wait_ack; /* Transmitter is waiting ack (poll sent) */
237 bool rej_after_srej; /* Send a REJ when SREJ clears */
238
239 bool send_f_rsp; /* We need to send an F-bit response */
240
241 uint16_t rx_sdu_len; /* Length of the SDU being received */
242 BT_HDR* p_rx_sdu; /* Buffer holding the SDU being received */
243 fixed_queue_t*
244 waiting_for_ack_q; /* Buffers sent and waiting for peer to ack */
245 fixed_queue_t* srej_rcv_hold_q; /* Buffers rcvd but held pending SREJ rsp */
246 fixed_queue_t* retrans_q; /* Buffers being retransmitted */
247
248 alarm_t* ack_timer; /* Timer delaying RR */
249 alarm_t* mon_retrans_timer; /* Timer Monitor or Retransmission */
250
251 } tL2C_FCRB;
252
253 typedef struct {
254 bool in_use;
255 bool log_packets;
256 uint16_t psm;
257 uint16_t real_psm; /* This may be a dummy RCB for an o/b connection but */
258 /* this is the real PSM that we need to connect to */
259 tL2CAP_APPL_INFO api;
260 tL2CAP_ERTM_INFO ertm_info;
261 tL2CAP_LE_CFG_INFO coc_cfg;
262 uint16_t my_mtu;
263 uint16_t required_remote_mtu;
264 } tL2C_RCB;
265
266 #ifndef L2CAP_CBB_DEFAULT_DATA_RATE_BUFF_QUOTA
267 #define L2CAP_CBB_DEFAULT_DATA_RATE_BUFF_QUOTA 100
268 #endif
269
270 typedef void(tL2CAP_SEC_CBACK)(const RawAddress& bd_addr,
271 tBT_TRANSPORT trasnport, void* p_ref_data,
272 tBTM_STATUS result);
273
274 typedef struct {
275 uint16_t psm;
276 tBT_TRANSPORT transport;
277 bool is_originator;
278 tL2CAP_SEC_CBACK* p_callback;
279 void* p_ref_data;
280 } tL2CAP_SEC_DATA;
281
282 /* Define a channel control block (CCB). There may be many channel control
283 * blocks between the same two Bluetooth devices (i.e. on the same link).
284 * Each CCB has unique local and remote CIDs. All channel control blocks on
285 * the same physical link and are chained together.
286 */
287 typedef struct t_l2c_ccb {
288 bool in_use; /* true when in use, false when not */
289 tL2C_CHNL_STATE chnl_state; /* Channel state */
290 tL2CAP_LE_CFG_INFO
291 local_conn_cfg; /* Our config for ble conn oriented channel */
292 tL2CAP_LE_CFG_INFO
293 peer_conn_cfg; /* Peer device config ble conn oriented channel */
294 bool is_first_seg; /* Dtermine whether the received packet is the first
295 segment or not */
296 BT_HDR* ble_sdu; /* Buffer for storing unassembled sdu*/
297 uint16_t ble_sdu_length; /* Length of unassembled sdu length*/
298 struct t_l2c_ccb* p_next_ccb; /* Next CCB in the chain */
299 struct t_l2c_ccb* p_prev_ccb; /* Previous CCB in the chain */
300 struct t_l2c_linkcb* p_lcb; /* Link this CCB is assigned to */
301
302 uint16_t local_cid; /* Local CID */
303 uint16_t remote_cid; /* Remote CID */
304
305 alarm_t* l2c_ccb_timer; /* CCB Timer Entry */
306
307 tL2C_RCB* p_rcb; /* Registration CB for this Channel */
308
309 #define IB_CFG_DONE 0x01
310 #define OB_CFG_DONE 0x02
311 #define RECONFIG_FLAG 0x04 /* True after initial configuration */
312
313 uint8_t config_done; /* Configuration flag word */
314 uint16_t remote_config_rsp_result; /* The config rsp result from remote */
315 uint8_t local_id; /* Transaction ID for local trans */
316 uint8_t remote_id; /* Transaction ID for local */
317
318 #define CCB_FLAG_NO_RETRY 0x01 /* no more retry */
319 #define CCB_FLAG_SENT_PENDING 0x02 /* already sent pending response */
320 uint8_t flags;
321
322 bool connection_initiator; /* true if we sent ConnectReq */
323
324 tL2CAP_CFG_INFO our_cfg; /* Our saved configuration options */
325 tL2CAP_CFG_INFO peer_cfg; /* Peer's saved configuration options */
326
327 fixed_queue_t* xmit_hold_q; /* Transmit data hold queue */
328 bool cong_sent; /* Set when congested status sent */
329 uint16_t buff_quota; /* Buffer quota before sending congestion */
330
331 tL2CAP_CHNL_PRIORITY ccb_priority; /* Channel priority */
332 tL2CAP_CHNL_DATA_RATE tx_data_rate; /* Channel Tx data rate */
333 tL2CAP_CHNL_DATA_RATE rx_data_rate; /* Channel Rx data rate */
334
335 /* Fields used for eL2CAP */
336 tL2CAP_ERTM_INFO ertm_info;
337 tL2C_FCRB fcrb;
338 uint16_t tx_mps; /* TX MPS adjusted based on current controller */
339 uint16_t max_rx_mtu;
340 uint8_t fcr_cfg_tries; /* Max number of negotiation attempts */
341 bool peer_cfg_already_rejected; /* If mode rejected once, set to true */
342 bool out_cfg_fcr_present; /* true if cfg response shoulkd include fcr options
343 */
344
345 bool is_flushable; /* true if channel is flushable */
346
347 uint16_t fixed_chnl_idle_tout; /* Idle timeout to use for the fixed channel */
348 uint16_t tx_data_len;
349
350 /* Number of LE frames that the remote can send to us (credit count in
351 * remote). Valid only for LE CoC */
352 uint16_t remote_credit_count;
353
354 /* used to indicate that ECOC is used */
355 bool ecoc{false};
356 bool reconfig_started;
357
358 struct {
359 struct {
360 unsigned bytes{0};
361 unsigned packets{0};
operatort_l2c_ccb::__anonf731843f0708::__anonf731843f0808362 void operator()(unsigned bytes) {
363 this->bytes += bytes;
364 this->packets++;
365 }
366 } rx, tx;
367 struct {
368 struct {
369 unsigned bytes{0};
370 unsigned packets{0};
operatort_l2c_ccb::__anonf731843f0708::__anonf731843f0908::__anonf731843f0a08371 void operator()(unsigned bytes) {
372 this->bytes += bytes;
373 this->packets++;
374 }
375 } rx, tx;
376 } dropped;
377 } metrics;
378
379 } tL2C_CCB;
380
381 /***********************************************************************
382 * Define a queue of linked CCBs.
383 */
384 typedef struct {
385 tL2C_CCB* p_first_ccb; /* The first channel in this queue */
386 tL2C_CCB* p_last_ccb; /* The last channel in this queue */
387 } tL2C_CCB_Q;
388
389 /* Round-Robin service for the same priority channels */
390 #define L2CAP_NUM_CHNL_PRIORITY \
391 3 /* Total number of priority group (high, medium, low)*/
392 #define L2CAP_CHNL_PRIORITY_WEIGHT \
393 5 /* weight per priority for burst transmission quota */
394 #define L2CAP_GET_PRIORITY_QUOTA(pri) \
395 ((L2CAP_NUM_CHNL_PRIORITY - (pri)) * L2CAP_CHNL_PRIORITY_WEIGHT)
396
397 #define L2CAP_CREDIT_BASED_MAX_CIDS 5
398
399 /* CCBs within the same LCB are served in round robin with priority It will make
400 * sure that low priority channel (for example, HF signaling on RFCOMM) can be
401 * sent to the headset even if higher priority channel (for example, AV media
402 * channel) is congested.
403 */
404
405 typedef struct {
406 tL2C_CCB* p_serve_ccb; /* current serving ccb within priority group */
407 tL2C_CCB* p_first_ccb; /* first ccb of priority group */
408 uint8_t num_ccb; /* number of channels in priority group */
409 uint8_t quota; /* burst transmission quota */
410 } tL2C_RR_SERV;
411
412 typedef enum : uint8_t {
413 /* disable update connection parameters */
414 L2C_BLE_CONN_UPDATE_DISABLE = (1u << 0),
415 /* new connection parameter to be set */
416 L2C_BLE_NEW_CONN_PARAM = (1u << 1),
417 /* waiting for connection update finished */
418 L2C_BLE_UPDATE_PENDING = (1u << 2),
419 /* not using default connection parameters */
420 L2C_BLE_NOT_DEFAULT_PARAM = (1u << 3),
421 } tCONN_UPDATE_MASK;
422
423 /* Define a link control block. There is one link control block between
424 * this device and any other device (i.e. BD ADDR).
425 */
426 typedef struct t_l2c_linkcb {
427 bool in_use; /* true when in use, false when not */
428 tL2C_LINK_STATE link_state;
429
430 alarm_t* l2c_lcb_timer; /* Timer entry for timeout evt */
431 private:
432 uint16_t handle_; /* The handle used with LM */
433 friend void l2cu_set_lcb_handle(struct t_l2c_linkcb& p_lcb, uint16_t handle);
SetHandlet_l2c_linkcb434 void SetHandle(uint16_t handle) { handle_ = handle; }
435
436 public:
Handlet_l2c_linkcb437 uint16_t Handle() const { return handle_; }
InvalidateHandlet_l2c_linkcb438 void InvalidateHandle() { handle_ = HCI_INVALID_HANDLE; }
439
440 tL2C_CCB_Q ccb_queue; /* Queue of CCBs on this LCB */
441
442 tL2C_CCB* p_pending_ccb; /* ccb of waiting channel during link disconnect */
443 alarm_t* info_resp_timer; /* Timer entry for info resp timeout evt */
444 RawAddress remote_bd_addr; /* The BD address of the remote */
445
446 private:
447 tHCI_ROLE link_role_{HCI_ROLE_CENTRAL}; /* Central or peripheral */
448 public:
LinkRolet_l2c_linkcb449 tHCI_ROLE LinkRole() const { return link_role_; }
IsLinkRoleCentralt_l2c_linkcb450 bool IsLinkRoleCentral() const { return link_role_ == HCI_ROLE_CENTRAL; }
IsLinkRolePeripheralt_l2c_linkcb451 bool IsLinkRolePeripheral() const {
452 return link_role_ == HCI_ROLE_PERIPHERAL;
453 }
SetLinkRoleAsCentralt_l2c_linkcb454 void SetLinkRoleAsCentral() { link_role_ = HCI_ROLE_CENTRAL; }
SetLinkRoleAsPeripheralt_l2c_linkcb455 void SetLinkRoleAsPeripheral() { link_role_ = HCI_ROLE_PERIPHERAL; }
456
457 uint8_t signal_id; /* Signalling channel id */
458 uint8_t cur_echo_id; /* Current id value for echo request */
459 uint16_t idle_timeout; /* Idle timeout */
460 private:
461 bool is_bonding_{false}; /* True - link active only for bonding */
462 public:
IsBondingt_l2c_linkcb463 bool IsBonding() const { return is_bonding_; }
SetBondingt_l2c_linkcb464 void SetBonding() { is_bonding_ = true; }
ResetBondingt_l2c_linkcb465 void ResetBonding() { is_bonding_ = false; }
466
467 uint16_t link_xmit_quota; /* Num outstanding pkts allowed */
is_round_robin_schedulingt_l2c_linkcb468 bool is_round_robin_scheduling() const { return link_xmit_quota == 0; }
469
470 uint16_t sent_not_acked; /* Num packets sent but not acked */
update_outstanding_packetst_l2c_linkcb471 void update_outstanding_packets(uint16_t packets_acked) {
472 if (sent_not_acked > packets_acked)
473 sent_not_acked -= packets_acked;
474 else
475 sent_not_acked = 0;
476 }
477
478 bool partial_segment_being_sent; /* Set true when a partial segment */
479 /* is being sent. */
480 bool w4_info_rsp; /* true when info request is active */
481 uint32_t peer_ext_fea; /* Peer's extended features mask */
482 list_t* link_xmit_data_q; /* Link transmit data buffer queue */
483
484 uint8_t peer_chnl_mask[L2CAP_FIXED_CHNL_ARRAY_SIZE];
485
486 tL2CAP_PRIORITY acl_priority;
is_normal_priorityt_l2c_linkcb487 bool is_normal_priority() const {
488 return acl_priority == L2CAP_PRIORITY_NORMAL;
489 }
is_high_priorityt_l2c_linkcb490 bool is_high_priority() const { return acl_priority == L2CAP_PRIORITY_HIGH; }
set_priorityt_l2c_linkcb491 bool set_priority(tL2CAP_PRIORITY priority) {
492 if (acl_priority != priority) {
493 acl_priority = priority;
494 return true;
495 }
496 return false;
497 }
498
499 tL2C_CCB* p_fixed_ccbs[L2CAP_NUM_FIXED_CHNLS];
500
501 private:
502 tHCI_REASON disc_reason_{HCI_ERR_UNDEFINED};
503
504 public:
DisconnectReasont_l2c_linkcb505 tHCI_REASON DisconnectReason() const { return disc_reason_; }
SetDisconnectReasont_l2c_linkcb506 void SetDisconnectReason(tHCI_REASON disc_reason) {
507 disc_reason_ = disc_reason;
508 }
509
510 tBT_TRANSPORT transport;
is_transport_br_edrt_l2c_linkcb511 bool is_transport_br_edr() const { return transport == BT_TRANSPORT_BR_EDR; }
is_transport_blet_l2c_linkcb512 bool is_transport_ble() const { return transport == BT_TRANSPORT_LE; }
513
514 uint16_t tx_data_len; /* tx data length used in data length extension */
515 fixed_queue_t* le_sec_pending_q; /* LE coc channels waiting for security check
516 completion */
517 uint8_t sec_act;
518
519 uint8_t conn_update_mask;
520
521 uint16_t min_interval; /* parameters as requested by peripheral */
522 uint16_t max_interval;
523 uint16_t latency;
524 uint16_t timeout;
525 uint16_t min_ce_len;
526 uint16_t max_ce_len;
527
528 /* each priority group is limited burst transmission */
529 /* round robin service for the same priority channels */
530 tL2C_RR_SERV rr_serv[L2CAP_NUM_CHNL_PRIORITY];
531 uint8_t rr_pri; /* current serving priority group */
532
533 /* Pending ECOC reconfiguration data */
534 tL2CAP_LE_CFG_INFO pending_ecoc_reconfig_cfg;
535 uint8_t pending_ecoc_reconfig_cnt;
536
537 /* This is to keep list of local cids use in the
538 * credit based connection response.
539 */
540 uint16_t pending_ecoc_connection_cids[L2CAP_CREDIT_BASED_MAX_CIDS];
541 uint8_t pending_ecoc_conn_cnt;
542
543 uint16_t pending_lead_cid;
544 uint16_t pending_l2cap_result;
545
number_of_active_dynamic_channelst_l2c_linkcb546 unsigned number_of_active_dynamic_channels() const {
547 unsigned cnt = 0;
548 const tL2C_CCB* cur = ccb_queue.p_first_ccb;
549 while (cur != nullptr) {
550 cnt++;
551 cur = cur->p_next_ccb;
552 }
553 return cnt;
554 }
555 } tL2C_LCB;
556
557 /* Define the L2CAP control structure
558 */
559 typedef struct {
560 uint8_t l2cap_trace_level;
561 uint16_t controller_xmit_window; /* Total ACL window for all links */
562
563 uint16_t round_robin_quota; /* Round-robin link quota */
564 uint16_t round_robin_unacked; /* Round-robin unacked */
is_classic_round_robin_quota_available__anonf731843f0e08565 bool is_classic_round_robin_quota_available() const {
566 return round_robin_unacked < round_robin_quota;
567 }
update_outstanding_classic_packets__anonf731843f0e08568 void update_outstanding_classic_packets(uint16_t num_packets_acked) {
569 if (round_robin_unacked > num_packets_acked)
570 round_robin_unacked -= num_packets_acked;
571 else
572 round_robin_unacked = 0;
573 }
574
575 bool check_round_robin; /* Do a round robin check */
576
577 bool is_cong_cback_context;
578
579 tL2C_LCB lcb_pool[MAX_L2CAP_LINKS]; /* Link Control Block pool */
580 tL2C_CCB ccb_pool[MAX_L2CAP_CHANNELS]; /* Channel Control Block pool */
581 tL2C_RCB rcb_pool[MAX_L2CAP_CLIENTS]; /* Registration info pool */
582
583 tL2C_CCB* p_free_ccb_first; /* Pointer to first free CCB */
584 tL2C_CCB* p_free_ccb_last; /* Pointer to last free CCB */
585
586 bool disallow_switch; /* false, to allow switch at create conn */
587 uint16_t num_lm_acl_bufs; /* # of ACL buffers on controller */
588 uint16_t idle_timeout; /* Idle timeout */
589
590 list_t* rcv_pending_q; /* Recv pending queue */
591 alarm_t* receive_hold_timer; /* Timer entry for rcv hold */
592
593 tL2C_LCB* p_cur_hcit_lcb; /* Current HCI Transport buffer */
594 uint16_t num_used_lcbs; /* Number of active link control blocks */
595
596 uint16_t non_flushable_pbf; /* L2CAP_PKT_START_NON_FLUSHABLE if controller
597 supports */
598 /* Otherwise, L2CAP_PKT_START */
599
600 #if (L2CAP_CONFORMANCE_TESTING == TRUE)
601 uint32_t test_info_resp; /* Conformance testing needs a dynamic response */
602 #endif
603
604 tL2CAP_FIXED_CHNL_REG
605 fixed_reg[L2CAP_NUM_FIXED_CHNLS]; /* Reg info for fixed channels */
606
607 uint16_t num_ble_links_active; /* Number of LE links active */
608 uint16_t controller_le_xmit_window; /* Total ACL window for all links */
609 tL2C_BLE_FIXED_CHNLS_MASK l2c_ble_fixed_chnls_mask; // LE fixed channels mask
610 uint16_t num_lm_ble_bufs; /* # of ACL buffers on controller */
611 uint16_t ble_round_robin_quota; /* Round-robin link quota */
612 uint16_t ble_round_robin_unacked; /* Round-robin unacked */
is_ble_round_robin_quota_available__anonf731843f0e08613 bool is_ble_round_robin_quota_available() const {
614 return ble_round_robin_unacked < ble_round_robin_quota;
615 }
update_outstanding_le_packets__anonf731843f0e08616 void update_outstanding_le_packets(uint16_t num_packets_acked) {
617 if (ble_round_robin_unacked > num_packets_acked)
618 ble_round_robin_unacked -= num_packets_acked;
619 else
620 ble_round_robin_unacked = 0;
621 }
622
623 bool ble_check_round_robin; /* Do a round robin check */
624 tL2C_RCB ble_rcb_pool[BLE_MAX_L2CAP_CLIENTS]; /* Registration info pool */
625
626 uint16_t le_dyn_psm; /* Next LE dynamic PSM value to try to assign */
627 bool le_dyn_psm_assigned[LE_DYNAMIC_PSM_RANGE]; /* Table of assigned LE PSM */
628
629 } tL2C_CB;
630
631 /* Define a structure that contains the information about a connection.
632 * This structure is used to pass between functions, and not all the
633 * fields will always be filled in.
634 */
635 typedef struct {
636 RawAddress bd_addr; /* Remote BD address */
637 uint8_t status; /* Connection status */
638 uint16_t psm; /* PSM of the connection */
639 uint16_t l2cap_result; /* L2CAP result */
640 uint16_t l2cap_status; /* L2CAP status */
641 uint16_t remote_cid; /* Remote CID */
642 std::vector<uint16_t> lcids; /* Used when credit based is used*/
643 uint16_t peer_mtu; /* Peer MTU */
644 } tL2C_CONN_INFO;
645
646 typedef void(tL2C_FCR_MGMT_EVT_HDLR)(uint8_t, tL2C_CCB*);
647
648 /* The offset in a buffer that L2CAP will use when building commands.
649 */
650 #define L2CAP_SEND_CMD_OFFSET 0
651
652 /* Number of ACL buffers to use for high priority channel
653 */
654 #define L2CAP_HIGH_PRI_MIN_XMIT_QUOTA_A (L2CAP_HIGH_PRI_MIN_XMIT_QUOTA)
655
656 /* L2CAP global data
657 ***********************************
658 */
659 extern tL2C_CB l2cb;
660
661 /* Functions provided by l2c_main.cc
662 ***********************************
663 */
664
665 extern void l2c_receive_hold_timer_timeout(void* data);
666 extern void l2c_ccb_timer_timeout(void* data);
667 extern void l2c_lcb_timer_timeout(void* data);
668 extern void l2c_fcrb_ack_timer_timeout(void* data);
669 extern uint8_t l2c_data_write(uint16_t cid, BT_HDR* p_data, uint16_t flag);
670 extern void l2c_process_held_packets(bool timed_out);
671
672 extern tL2C_LCB* l2cu_allocate_lcb(const RawAddress& p_bd_addr, bool is_bonding,
673 tBT_TRANSPORT transport);
674 extern void l2cu_release_lcb(tL2C_LCB* p_lcb);
675 extern tL2C_LCB* l2cu_find_lcb_by_bd_addr(const RawAddress& p_bd_addr,
676 tBT_TRANSPORT transport);
677 extern tL2C_LCB* l2cu_find_lcb_by_handle(uint16_t handle);
678
679 extern bool l2cu_set_acl_priority(const RawAddress& bd_addr,
680 tL2CAP_PRIORITY priority,
681 bool reset_after_rs);
682
683 extern void l2cu_enqueue_ccb(tL2C_CCB* p_ccb);
684 extern void l2cu_dequeue_ccb(tL2C_CCB* p_ccb);
685 extern void l2cu_change_pri_ccb(tL2C_CCB* p_ccb, tL2CAP_CHNL_PRIORITY priority);
686
687 extern tL2C_CCB* l2cu_allocate_ccb(tL2C_LCB* p_lcb, uint16_t cid);
688 extern void l2cu_release_ccb(tL2C_CCB* p_ccb);
689 extern tL2C_CCB* l2cu_find_ccb_by_cid(tL2C_LCB* p_lcb, uint16_t local_cid);
690 extern tL2C_CCB* l2cu_find_ccb_by_remote_cid(tL2C_LCB* p_lcb,
691 uint16_t remote_cid);
692 extern bool l2c_is_cmd_rejected(uint8_t cmd_code, uint8_t id, tL2C_LCB* p_lcb);
693
694 extern void l2cu_send_peer_cmd_reject(tL2C_LCB* p_lcb, uint16_t reason,
695 uint8_t rem_id, uint16_t p1, uint16_t p2);
696 extern void l2cu_send_peer_connect_req(tL2C_CCB* p_ccb);
697 extern void l2cu_send_peer_connect_rsp(tL2C_CCB* p_ccb, uint16_t result,
698 uint16_t status);
699 extern void l2cu_send_peer_config_req(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
700 extern void l2cu_send_peer_config_rsp(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
701 extern void l2cu_send_peer_config_rej(tL2C_CCB* p_ccb, uint8_t* p_data,
702 uint16_t data_len, uint16_t rej_len);
703 extern void l2cu_send_peer_disc_req(tL2C_CCB* p_ccb);
704 extern void l2cu_send_peer_disc_rsp(tL2C_LCB* p_lcb, uint8_t remote_id,
705 uint16_t local_cid, uint16_t remote_cid);
706 extern void l2cu_send_peer_echo_rsp(tL2C_LCB* p_lcb, uint8_t id,
707 uint8_t* p_data, uint16_t data_len);
708 extern void l2cu_send_peer_info_rsp(tL2C_LCB* p_lcb, uint8_t id,
709 uint16_t info_type);
710 extern void l2cu_reject_connection(tL2C_LCB* p_lcb, uint16_t remote_cid,
711 uint8_t rem_id, uint16_t result);
712 extern void l2cu_send_peer_info_req(tL2C_LCB* p_lcb, uint16_t info_type);
713 extern void l2cu_set_acl_hci_header(BT_HDR* p_buf, tL2C_CCB* p_ccb);
714 extern void l2cu_check_channel_congestion(tL2C_CCB* p_ccb);
715 extern void l2cu_disconnect_chnl(tL2C_CCB* p_ccb);
716
717 extern void l2cu_send_peer_ble_par_req(tL2C_LCB* p_lcb, uint16_t min_int,
718 uint16_t max_int, uint16_t latency,
719 uint16_t timeout);
720 extern void l2cu_send_peer_ble_par_rsp(tL2C_LCB* p_lcb, uint16_t reason,
721 uint8_t rem_id);
722 extern void l2cu_reject_ble_connection(tL2C_CCB* p_ccb, uint8_t rem_id,
723 uint16_t result);
724 extern void l2cu_reject_credit_based_conn_req(tL2C_LCB* p_lcb, uint8_t rem_id,
725 uint8_t num_of_channels,
726 uint16_t result);
727 extern void l2cu_reject_ble_coc_connection(tL2C_LCB* p_lcb, uint8_t rem_id,
728 uint16_t result);
729 extern void l2cu_send_peer_ble_credit_based_conn_res(tL2C_CCB* p_ccb,
730 uint16_t result);
731 extern void l2cu_send_peer_credit_based_conn_res(
732 tL2C_CCB* p_ccb, std::vector<uint16_t>& accepted_lcids, uint16_t result);
733
734 extern void l2cu_send_peer_ble_credit_based_conn_req(tL2C_CCB* p_ccb);
735 extern void l2cu_send_peer_credit_based_conn_req(tL2C_CCB* p_ccb);
736
737 extern void l2cu_send_ble_reconfig_rsp(tL2C_LCB* p_lcb, uint8_t rem_id,
738 uint16_t result);
739 extern void l2cu_send_credit_based_reconfig_req(tL2C_CCB* p_ccb,
740 tL2CAP_LE_CFG_INFO* p_data);
741
742 extern void l2cu_send_peer_ble_flow_control_credit(tL2C_CCB* p_ccb,
743 uint16_t credit_value);
744 extern void l2cu_send_peer_ble_credit_based_disconn_req(tL2C_CCB* p_ccb);
745
746 extern bool l2cu_initialize_fixed_ccb(tL2C_LCB* p_lcb, uint16_t fixed_cid);
747 extern void l2cu_no_dynamic_ccbs(tL2C_LCB* p_lcb);
748 extern void l2cu_process_fixed_chnl_resp(tL2C_LCB* p_lcb);
749 extern bool l2cu_is_ccb_active(tL2C_CCB* p_ccb);
750
751 /* Functions provided for Broadcom Aware
752 ***************************************
753 */
754
755 extern tL2C_RCB* l2cu_allocate_rcb(uint16_t psm);
756 extern tL2C_RCB* l2cu_find_rcb_by_psm(uint16_t psm);
757 extern void l2cu_release_rcb(tL2C_RCB* p_rcb);
758 extern void l2cu_release_ble_rcb(tL2C_RCB* p_rcb);
759 extern tL2C_RCB* l2cu_allocate_ble_rcb(uint16_t psm);
760 extern tL2C_RCB* l2cu_find_ble_rcb_by_psm(uint16_t psm);
761
762 extern uint8_t l2cu_process_peer_cfg_req(tL2C_CCB* p_ccb,
763 tL2CAP_CFG_INFO* p_cfg);
764 extern void l2cu_process_peer_cfg_rsp(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
765 extern void l2cu_process_our_cfg_req(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
766 extern void l2cu_process_our_cfg_rsp(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
767
768 extern tL2C_LCB* l2cu_find_lcb_by_state(tL2C_LINK_STATE state);
769 extern bool l2cu_lcb_disconnecting(void);
770
771 extern void l2cu_create_conn_br_edr(tL2C_LCB* p_lcb);
772 extern bool l2cu_create_conn_le(tL2C_LCB* p_lcb);
773 extern void l2cu_create_conn_after_switch(tL2C_LCB* p_lcb);
774 extern void l2cu_adjust_out_mps(tL2C_CCB* p_ccb);
775
776 /* Functions provided by l2c_link.cc
777 ***********************************
778 */
779 extern void l2c_link_timeout(tL2C_LCB* p_lcb);
780 extern void l2c_info_resp_timer_timeout(void* data);
781 extern void l2c_link_check_send_pkts(tL2C_LCB* p_lcb, uint16_t local_cid,
782 BT_HDR* p_buf);
783 extern void l2c_link_adjust_allocation(void);
784
785 extern void l2c_link_sec_comp(const RawAddress* p_bda, tBT_TRANSPORT trasnport,
786 void* p_ref_data, tBTM_STATUS status);
787 extern void l2c_link_sec_comp2(const RawAddress& p_bda, tBT_TRANSPORT trasnport,
788 void* p_ref_data, tBTM_STATUS status);
789 extern void l2c_link_adjust_chnl_allocation(void);
790
791 #if (L2CAP_CONFORMANCE_TESTING == TRUE)
792 /* Used only for conformance testing */
793 extern void l2cu_set_info_rsp_mask(uint32_t mask);
794 #endif
795
796 /* Functions provided by l2c_csm.cc
797 ***********************************
798 */
799 extern void l2c_csm_execute(tL2C_CCB* p_ccb, tL2CEVT event, void* p_data);
800
801 extern void l2c_enqueue_peer_data(tL2C_CCB* p_ccb, BT_HDR* p_buf);
802
803 /* Functions provided by l2c_fcr.cc
804 ***********************************
805 */
806 extern void l2c_fcr_cleanup(tL2C_CCB* p_ccb);
807 extern void l2c_fcr_proc_pdu(tL2C_CCB* p_ccb, BT_HDR* p_buf);
808 extern void l2c_fcr_proc_tout(tL2C_CCB* p_ccb);
809 extern void l2c_fcr_proc_ack_tout(tL2C_CCB* p_ccb);
810 extern void l2c_fcr_send_S_frame(tL2C_CCB* p_ccb, uint16_t function_code,
811 uint16_t pf_bit);
812 extern BT_HDR* l2c_fcr_clone_buf(BT_HDR* p_buf, uint16_t new_offset,
813 uint16_t no_of_bytes);
814 extern bool l2c_fcr_is_flow_controlled(tL2C_CCB* p_ccb);
815 extern BT_HDR* l2c_fcr_get_next_xmit_sdu_seg(tL2C_CCB* p_ccb,
816 uint16_t max_packet_length);
817 extern void l2c_fcr_start_timer(tL2C_CCB* p_ccb);
818 extern void l2c_lcc_proc_pdu(tL2C_CCB* p_ccb, BT_HDR* p_buf);
819 extern BT_HDR* l2c_lcc_get_next_xmit_sdu_seg(tL2C_CCB* p_ccb,
820 bool* last_piece_of_sdu);
821
822 /* Configuration negotiation */
823 extern uint8_t l2c_fcr_chk_chan_modes(tL2C_CCB* p_ccb);
824
825 extern void l2c_fcr_adj_our_rsp_options(tL2C_CCB* p_ccb,
826 tL2CAP_CFG_INFO* p_peer_cfg);
827 extern bool l2c_fcr_renegotiate_chan(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
828 extern uint8_t l2c_fcr_process_peer_cfg_req(tL2C_CCB* p_ccb,
829 tL2CAP_CFG_INFO* p_cfg);
830 extern void l2c_fcr_adj_monitor_retran_timeout(tL2C_CCB* p_ccb);
831 extern void l2c_fcr_stop_timer(tL2C_CCB* p_ccb);
832
833 /* Functions provided by l2c_ble.cc
834 ***********************************
835 */
836 extern bool l2cble_create_conn(tL2C_LCB* p_lcb);
837 extern void l2cble_process_sig_cmd(tL2C_LCB* p_lcb, uint8_t* p,
838 uint16_t pkt_len);
839 extern void l2c_ble_link_adjust_allocation(void);
840
841 extern void l2cble_credit_based_conn_req(tL2C_CCB* p_ccb);
842 extern void l2cble_credit_based_conn_res(tL2C_CCB* p_ccb, uint16_t result);
843 extern void l2cble_send_peer_disc_req(tL2C_CCB* p_ccb);
844 extern void l2cble_send_flow_control_credit(tL2C_CCB* p_ccb,
845 uint16_t credit_value);
846 extern tL2CAP_LE_RESULT_CODE l2ble_sec_access_req(const RawAddress& bd_addr,
847 uint16_t psm,
848 bool is_originator,
849 tL2CAP_SEC_CBACK* p_callback,
850 void* p_ref_data);
851
852 extern void l2cble_update_data_length(tL2C_LCB* p_lcb);
853
854 extern void l2cu_process_fixed_disc_cback(tL2C_LCB* p_lcb);
855
856 #endif
857