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 <base/strings/stringprintf.h>
28 #include <stdbool.h>
29
30 #include <string>
31
32 #include "btm_api.h"
33 #include "btm_ble_api.h"
34 #include "l2c_api.h"
35 #include "l2cap_acl_interface.h"
36 #include "l2cap_controller_interface.h"
37 #include "l2cap_hci_link_interface.h"
38 #include "l2cap_security_interface.h"
39 #include "l2cdefs.h"
40 #include "osi/include/alarm.h"
41 #include "osi/include/fixed_queue.h"
42 #include "osi/include/list.h"
43 #include "stack/include/bt_hdr.h"
44 #include "stack/include/hci_error_code.h"
45 #include "types/hci_role.h"
46 #include "types/raw_address.h"
47
48 #define L2CAP_MIN_MTU 48 /* Minimum acceptable MTU is 48 bytes */
49
50 #define MAX_ACTIVE_AVDT_CONN 2
51
52 constexpr uint16_t L2CAP_CREDIT_BASED_MIN_MTU = 64;
53 constexpr uint16_t L2CAP_CREDIT_BASED_MIN_MPS = 64;
54
55 /*
56 * Timeout values (in milliseconds).
57 */
58 #define L2CAP_LINK_ROLE_SWITCH_TIMEOUT_MS (10 * 1000) /* 10 seconds */
59 #define L2CAP_LINK_CONNECT_TIMEOUT_MS (60 * 1000) /* 30 seconds */
60 #define L2CAP_LINK_CONNECT_EXT_TIMEOUT_MS (120 * 1000) /* 120 seconds */
61 #define L2CAP_LINK_FLOW_CONTROL_TIMEOUT_MS (2 * 1000) /* 2 seconds */
62 #define L2CAP_LINK_DISCONNECT_TIMEOUT_MS (30 * 1000) /* 30 seconds */
63 #define L2CAP_CHNL_CONNECT_TIMEOUT_MS (60 * 1000) /* 60 seconds */
64 #define L2CAP_CHNL_CONNECT_EXT_TIMEOUT_MS (120 * 1000) /* 120 seconds */
65 #define L2CAP_CHNL_CFG_TIMEOUT_MS (30 * 1000) /* 30 seconds */
66 #define L2CAP_CHNL_DISCONNECT_TIMEOUT_MS (10 * 1000) /* 10 seconds */
67 #define L2CAP_DELAY_CHECK_SM4_TIMEOUT_MS (2 * 1000) /* 2 seconds */
68 #define L2CAP_WAIT_INFO_RSP_TIMEOUT_MS (3 * 1000) /* 3 seconds */
69 #define L2CAP_BLE_LINK_CONNECT_TIMEOUT_MS (30 * 1000) /* 30 seconds */
70 #define L2CAP_FCR_ACK_TIMEOUT_MS 200 /* 200 milliseconds */
71
72 /* Define the possible L2CAP channel states. The names of
73 * the states may seem a bit strange, but they are taken from
74 * the Bluetooth specification.
75 */
76 typedef enum {
77 CST_CLOSED, /* Channel is in closed state */
78 CST_ORIG_W4_SEC_COMP, /* Originator waits security clearence */
79 CST_TERM_W4_SEC_COMP, /* Acceptor waits security clearence */
80 CST_W4_L2CAP_CONNECT_RSP, /* Waiting for peer conenct response */
81 CST_W4_L2CA_CONNECT_RSP, /* Waiting for upper layer connect rsp */
82 CST_CONFIG, /* Negotiating configuration */
83 CST_OPEN, /* Data transfer state */
84 CST_W4_L2CAP_DISCONNECT_RSP, /* Waiting for peer disconnect rsp */
85 CST_W4_L2CA_DISCONNECT_RSP /* Waiting for upper layer disc rsp */
86 } tL2C_CHNL_STATE;
87
88 #define CASE_RETURN_TEXT(code) \
89 case code: \
90 return #code
91
channel_state_text(const tL2C_CHNL_STATE & state)92 inline std::string channel_state_text(const tL2C_CHNL_STATE& state) {
93 switch (state) {
94 CASE_RETURN_TEXT(CST_CLOSED);
95 CASE_RETURN_TEXT(CST_ORIG_W4_SEC_COMP);
96 CASE_RETURN_TEXT(CST_TERM_W4_SEC_COMP);
97 CASE_RETURN_TEXT(CST_W4_L2CAP_CONNECT_RSP);
98 CASE_RETURN_TEXT(CST_W4_L2CA_CONNECT_RSP);
99 CASE_RETURN_TEXT(CST_CONFIG);
100 CASE_RETURN_TEXT(CST_OPEN);
101 CASE_RETURN_TEXT(CST_W4_L2CAP_DISCONNECT_RSP);
102 CASE_RETURN_TEXT(CST_W4_L2CA_DISCONNECT_RSP);
103 default:
104 return base::StringPrintf("UNKNOWN[%d]", state);
105 }
106 }
107 #undef CASE_RETURN_TEXT
108
109 /* Define the possible L2CAP link states
110 */
111 typedef enum {
112 LST_DISCONNECTED,
113 LST_CONNECT_HOLDING,
114 LST_CONNECTING_WAIT_SWITCH,
115 LST_CONNECTING,
116 LST_CONNECTED,
117 LST_DISCONNECTING
118 } tL2C_LINK_STATE;
119
link_state_text(const tL2C_LINK_STATE & state)120 inline std::string link_state_text(const tL2C_LINK_STATE& state) {
121 switch (state) {
122 case LST_DISCONNECTED:
123 return std::string("LST_DISCONNECTED");
124 case LST_CONNECT_HOLDING:
125 return std::string("LST_CONNECT_HOLDING");
126 case LST_CONNECTING_WAIT_SWITCH:
127 return std::string("LST_CONNECTING_WAIT_SWITCH");
128 case LST_CONNECTING:
129 return std::string("LST_CONNECTING");
130 case LST_CONNECTED:
131 return std::string("LST_CONNECTED");
132 case LST_DISCONNECTING:
133 return std::string("LST_DISCONNECTING");
134 default:
135 return std::string("UNKNOWN");
136 }
137 }
138
139 /* Define input events to the L2CAP link and channel state machines. The names
140 * of the events may seem a bit strange, but they are taken from
141 * the Bluetooth specification.
142 */
143 typedef enum : uint16_t {
144 /* Lower layer */
145 L2CEVT_LP_CONNECT_CFM = 0, /* connect confirm */
146 L2CEVT_LP_CONNECT_CFM_NEG = 1, /* connect confirm (failed) */
147 L2CEVT_LP_CONNECT_IND = 2, /* connect indication */
148 L2CEVT_LP_DISCONNECT_IND = 3, /* disconnect indication */
149
150 /* Security */
151 L2CEVT_SEC_COMP = 7, /* cleared successfully */
152 L2CEVT_SEC_COMP_NEG = 8, /* procedure failed */
153
154 /* Peer connection */
155 L2CEVT_L2CAP_CONNECT_REQ = 10, /* request */
156 L2CEVT_L2CAP_CONNECT_RSP = 11, /* response */
157 L2CEVT_L2CAP_CONNECT_RSP_PND = 12, /* response pending */
158 L2CEVT_L2CAP_CONNECT_RSP_NEG = 13, /* response (failed) */
159
160 /* Peer configuration */
161 L2CEVT_L2CAP_CONFIG_REQ = 14, /* request */
162 L2CEVT_L2CAP_CONFIG_RSP = 15, /* response */
163 L2CEVT_L2CAP_CONFIG_RSP_NEG = 16, /* response (failed) */
164
165 L2CEVT_L2CAP_DISCONNECT_REQ = 17, /* Peer disconnect request */
166 L2CEVT_L2CAP_DISCONNECT_RSP = 18, /* Peer disconnect response */
167 L2CEVT_L2CAP_INFO_RSP = 19, /* Peer information response */
168 L2CEVT_L2CAP_DATA = 20, /* Peer data */
169
170 /* Upper layer */
171 L2CEVT_L2CA_CONNECT_REQ = 21, /* connect request */
172 L2CEVT_L2CA_CONNECT_RSP = 22, /* connect response */
173 L2CEVT_L2CA_CONNECT_RSP_NEG = 23, /* connect response (failed)*/
174 L2CEVT_L2CA_CONFIG_REQ = 24, /* config request */
175 L2CEVT_L2CA_CONFIG_RSP = 25, /* config response */
176 L2CEVT_L2CA_DISCONNECT_REQ = 27, /* disconnect request */
177 L2CEVT_L2CA_DISCONNECT_RSP = 28, /* disconnect response */
178 L2CEVT_L2CA_DATA_READ = 29, /* data read */
179 L2CEVT_L2CA_DATA_WRITE = 30, /* data write */
180
181 L2CEVT_TIMEOUT = 32, /* Timeout */
182 L2CEVT_SEC_RE_SEND_CMD = 33, /* btm_sec has enough info to proceed */
183
184 L2CEVT_ACK_TIMEOUT = 34, /* RR delay timeout */
185
186 L2CEVT_L2CA_SEND_FLOW_CONTROL_CREDIT = 35, /* Upper layer credit packet \
187 */
188 /* Peer credit based connection */
189 L2CEVT_L2CAP_RECV_FLOW_CONTROL_CREDIT = 36, /* credit packet */
190 L2CEVT_L2CAP_CREDIT_BASED_CONNECT_REQ =
191 37, /* credit based connection request */
192 L2CEVT_L2CAP_CREDIT_BASED_CONNECT_RSP =
193 38, /* accepted credit based connection */
194 L2CEVT_L2CAP_CREDIT_BASED_CONNECT_RSP_NEG =
195 39, /* rejected credit based connection */
196 L2CEVT_L2CAP_CREDIT_BASED_RECONFIG_REQ =
197 40, /* credit based reconfig request*/
198 L2CEVT_L2CAP_CREDIT_BASED_RECONFIG_RSP =
199 41, /* credit based reconfig response */
200
201 /* Upper layer credit based connection */
202 L2CEVT_L2CA_CREDIT_BASED_CONNECT_REQ = 42, /* connect request */
203 L2CEVT_L2CA_CREDIT_BASED_CONNECT_RSP = 43, /* connect response */
204 L2CEVT_L2CA_CREDIT_BASED_CONNECT_RSP_NEG = 44, /* connect response (failed)*/
205 L2CEVT_L2CA_CREDIT_BASED_RECONFIG_REQ = 45, /* reconfig request */
206 } tL2CEVT;
207
208 /* Constants for LE Dynamic PSM values */
209 #define LE_DYNAMIC_PSM_START 0x0080
210 #define LE_DYNAMIC_PSM_END 0x00FF
211 #define LE_DYNAMIC_PSM_RANGE (LE_DYNAMIC_PSM_END - LE_DYNAMIC_PSM_START + 1)
212
213 /* Return values for l2cu_process_peer_cfg_req() */
214 #define L2CAP_PEER_CFG_UNACCEPTABLE 0
215 #define L2CAP_PEER_CFG_OK 1
216 #define L2CAP_PEER_CFG_DISCONNECT 2
217
218 /* eL2CAP option constants */
219 /* Min retransmission timeout if no flush timeout or PBF */
220 #define L2CAP_MIN_RETRANS_TOUT 2000
221 /* Min monitor timeout if no flush timeout or PBF */
222 #define L2CAP_MIN_MONITOR_TOUT 12000
223
224 #define L2CAP_MAX_FCR_CFG_TRIES 2 /* Config attempts before disconnecting */
225
226 typedef uint8_t tL2C_BLE_FIXED_CHNLS_MASK;
227
228 typedef struct {
229 uint8_t next_tx_seq; /* Next sequence number to be Tx'ed */
230 uint8_t last_rx_ack; /* Last sequence number ack'ed by the peer */
231 uint8_t next_seq_expected; /* Next peer sequence number expected */
232 uint8_t last_ack_sent; /* Last peer sequence number ack'ed */
233 uint8_t num_tries; /* Number of retries to send a packet */
234 uint8_t max_held_acks; /* Max acks we can hold before sending */
235
236 bool remote_busy; /* true if peer has flowed us off */
237
238 bool rej_sent; /* Reject was sent */
239 bool srej_sent; /* Selective Reject was sent */
240 bool wait_ack; /* Transmitter is waiting ack (poll sent) */
241 bool rej_after_srej; /* Send a REJ when SREJ clears */
242
243 bool send_f_rsp; /* We need to send an F-bit response */
244
245 uint16_t rx_sdu_len; /* Length of the SDU being received */
246 BT_HDR* p_rx_sdu; /* Buffer holding the SDU being received */
247 fixed_queue_t*
248 waiting_for_ack_q; /* Buffers sent and waiting for peer to ack */
249 fixed_queue_t* srej_rcv_hold_q; /* Buffers rcvd but held pending SREJ rsp */
250 fixed_queue_t* retrans_q; /* Buffers being retransmitted */
251
252 alarm_t* ack_timer; /* Timer delaying RR */
253 alarm_t* mon_retrans_timer; /* Timer Monitor or Retransmission */
254
255 } tL2C_FCRB;
256
257 typedef struct {
258 bool in_use;
259 bool log_packets;
260 uint16_t psm;
261 uint16_t real_psm; /* This may be a dummy RCB for an o/b connection but */
262 /* this is the real PSM that we need to connect to */
263 tL2CAP_APPL_INFO api;
264 tL2CAP_ERTM_INFO ertm_info;
265 tL2CAP_LE_CFG_INFO coc_cfg;
266 uint16_t my_mtu;
267 uint16_t required_remote_mtu;
268 } tL2C_RCB;
269
270 #ifndef L2CAP_CBB_DEFAULT_DATA_RATE_BUFF_QUOTA
271 #define L2CAP_CBB_DEFAULT_DATA_RATE_BUFF_QUOTA 100
272 #endif
273
274 typedef void(tL2CAP_SEC_CBACK)(const RawAddress& bd_addr,
275 tBT_TRANSPORT trasnport, void* p_ref_data,
276 tBTM_STATUS result);
277
278 typedef struct {
279 uint16_t psm;
280 tBT_TRANSPORT transport;
281 bool is_originator;
282 tL2CAP_SEC_CBACK* p_callback;
283 void* p_ref_data;
284 } tL2CAP_SEC_DATA;
285
286 /* Define a channel control block (CCB). There may be many channel control
287 * blocks between the same two Bluetooth devices (i.e. on the same link).
288 * Each CCB has unique local and remote CIDs. All channel control blocks on
289 * the same physical link and are chained together.
290 */
291 typedef struct t_l2c_ccb {
292 bool in_use; /* true when in use, false when not */
293 tL2C_CHNL_STATE chnl_state; /* Channel state */
294 tL2CAP_LE_CFG_INFO
295 local_conn_cfg; /* Our config for ble conn oriented channel */
296 tL2CAP_LE_CFG_INFO
297 peer_conn_cfg; /* Peer device config ble conn oriented channel */
298 bool is_first_seg; /* Dtermine whether the received packet is the first
299 segment or not */
300 BT_HDR* ble_sdu; /* Buffer for storing unassembled sdu*/
301 uint16_t ble_sdu_length; /* Length of unassembled sdu length*/
302 struct t_l2c_ccb* p_next_ccb; /* Next CCB in the chain */
303 struct t_l2c_ccb* p_prev_ccb; /* Previous CCB in the chain */
304 struct t_l2c_linkcb* p_lcb; /* Link this CCB is assigned to */
305
306 uint16_t local_cid; /* Local CID */
307 uint16_t remote_cid; /* Remote CID */
308
309 alarm_t* l2c_ccb_timer; /* CCB Timer Entry */
310
311 tL2C_RCB* p_rcb; /* Registration CB for this Channel */
312
313 #define IB_CFG_DONE 0x01
314 #define OB_CFG_DONE 0x02
315 #define RECONFIG_FLAG 0x04 /* True after initial configuration */
316
317 uint8_t config_done; /* Configuration flag word */
318 uint16_t remote_config_rsp_result; /* The config rsp result from remote */
319 uint8_t local_id; /* Transaction ID for local trans */
320 uint8_t remote_id; /* Transaction ID for local */
321
322 #define CCB_FLAG_NO_RETRY 0x01 /* no more retry */
323 #define CCB_FLAG_SENT_PENDING 0x02 /* already sent pending response */
324 uint8_t flags;
325
326 bool connection_initiator; /* true if we sent ConnectReq */
327
328 tL2CAP_CFG_INFO our_cfg; /* Our saved configuration options */
329 tL2CAP_CFG_INFO peer_cfg; /* Peer's saved configuration options */
330
331 fixed_queue_t* xmit_hold_q; /* Transmit data hold queue */
332 bool cong_sent; /* Set when congested status sent */
333 uint16_t buff_quota; /* Buffer quota before sending congestion */
334
335 tL2CAP_CHNL_PRIORITY ccb_priority; /* Channel priority */
336 tL2CAP_CHNL_DATA_RATE tx_data_rate; /* Channel Tx data rate */
337 tL2CAP_CHNL_DATA_RATE rx_data_rate; /* Channel Rx data rate */
338
339 /* Fields used for eL2CAP */
340 tL2CAP_ERTM_INFO ertm_info;
341 tL2C_FCRB fcrb;
342 uint16_t tx_mps; /* TX MPS adjusted based on current controller */
343 uint16_t max_rx_mtu;
344 uint8_t fcr_cfg_tries; /* Max number of negotiation attempts */
345 bool peer_cfg_already_rejected; /* If mode rejected once, set to true */
346 bool out_cfg_fcr_present; /* true if cfg response should include fcr options
347 */
348
349 bool is_flushable; /* true if channel is flushable */
350
351 uint16_t fixed_chnl_idle_tout; /* Idle timeout to use for the fixed channel */
352 uint16_t tx_data_len;
353
354 /* Number of LE frames that the remote can send to us (credit count in
355 * remote). Valid only for LE CoC */
356 uint16_t remote_credit_count;
357
358 /* used to indicate that ECOC is used */
359 bool ecoc{false};
360 bool reconfig_started;
361
362 struct {
363 struct {
364 unsigned bytes{0};
365 unsigned packets{0};
operatort_l2c_ccb::__anonaddf187a0708::__anonaddf187a0808366 void operator()(unsigned bytes) {
367 this->bytes += bytes;
368 this->packets++;
369 }
370 } rx, tx;
371 struct {
372 struct {
373 unsigned bytes{0};
374 unsigned packets{0};
operatort_l2c_ccb::__anonaddf187a0708::__anonaddf187a0908::__anonaddf187a0a08375 void operator()(unsigned bytes) {
376 this->bytes += bytes;
377 this->packets++;
378 }
379 } rx, tx;
380 } dropped;
381 } metrics;
382
383 } tL2C_CCB;
384
385 /***********************************************************************
386 * Define a queue of linked CCBs.
387 */
388 typedef struct {
389 tL2C_CCB* p_first_ccb; /* The first channel in this queue */
390 tL2C_CCB* p_last_ccb; /* The last channel in this queue */
391 } tL2C_CCB_Q;
392
393 /* Round-Robin service for the same priority channels */
394 #define L2CAP_NUM_CHNL_PRIORITY \
395 3 /* Total number of priority group (high, medium, low)*/
396 #define L2CAP_CHNL_PRIORITY_WEIGHT \
397 5 /* weight per priority for burst transmission quota */
398 #define L2CAP_GET_PRIORITY_QUOTA(pri) \
399 ((L2CAP_NUM_CHNL_PRIORITY - (pri)) * L2CAP_CHNL_PRIORITY_WEIGHT)
400
401 /* CCBs within the same LCB are served in round robin with priority It will make
402 * sure that low priority channel (for example, HF signaling on RFCOMM) can be
403 * sent to the headset even if higher priority channel (for example, AV media
404 * channel) is congested.
405 */
406
407 typedef struct {
408 tL2C_CCB* p_serve_ccb; /* current serving ccb within priority group */
409 tL2C_CCB* p_first_ccb; /* first ccb of priority group */
410 uint8_t num_ccb; /* number of channels in priority group */
411 uint8_t quota; /* burst transmission quota */
412 } tL2C_RR_SERV;
413
414 typedef enum : uint8_t {
415 /* disable update connection parameters */
416 L2C_BLE_CONN_UPDATE_DISABLE = (1u << 0),
417 /* new connection parameter to be set */
418 L2C_BLE_NEW_CONN_PARAM = (1u << 1),
419 /* waiting for connection update finished */
420 L2C_BLE_UPDATE_PENDING = (1u << 2),
421 /* not using default connection parameters */
422 L2C_BLE_NOT_DEFAULT_PARAM = (1u << 3),
423 } tCONN_UPDATE_MASK;
424
425 /* Define a link control block. There is one link control block between
426 * this device and any other device (i.e. BD ADDR).
427 */
428 typedef struct t_l2c_linkcb {
429 bool in_use; /* true when in use, false when not */
430 tL2C_LINK_STATE link_state;
431
432 alarm_t* l2c_lcb_timer; /* Timer entry for timeout evt */
433
434 // This tracks if the link has ever either (a)
435 // been used for a dynamic channel (EATT or L2CAP CoC), or (b) has been a
436 // GATT client. If false, the local device is just a GATT server, so for
437 // backwards compatibility we never do a link timeout.
438 bool with_active_local_clients{false};
439
440 private:
441 uint16_t handle_; /* The handle used with LM */
442 friend void l2cu_set_lcb_handle(struct t_l2c_linkcb& p_lcb, uint16_t handle);
SetHandlet_l2c_linkcb443 void SetHandle(uint16_t handle) { handle_ = handle; }
444
445 public:
Handlet_l2c_linkcb446 uint16_t Handle() const { return handle_; }
InvalidateHandlet_l2c_linkcb447 void InvalidateHandle() { handle_ = HCI_INVALID_HANDLE; }
448
449 tL2C_CCB_Q ccb_queue; /* Queue of CCBs on this LCB */
450
451 tL2C_CCB* p_pending_ccb; /* ccb of waiting channel during link disconnect */
452 alarm_t* info_resp_timer; /* Timer entry for info resp timeout evt */
453 RawAddress remote_bd_addr; /* The BD address of the remote */
454
455 private:
456 tHCI_ROLE link_role_{HCI_ROLE_CENTRAL}; /* Central or peripheral */
457 public:
LinkRolet_l2c_linkcb458 tHCI_ROLE LinkRole() const { return link_role_; }
IsLinkRoleCentralt_l2c_linkcb459 bool IsLinkRoleCentral() const { return link_role_ == HCI_ROLE_CENTRAL; }
IsLinkRolePeripheralt_l2c_linkcb460 bool IsLinkRolePeripheral() const {
461 return link_role_ == HCI_ROLE_PERIPHERAL;
462 }
SetLinkRoleAsCentralt_l2c_linkcb463 void SetLinkRoleAsCentral() { link_role_ = HCI_ROLE_CENTRAL; }
SetLinkRoleAsPeripheralt_l2c_linkcb464 void SetLinkRoleAsPeripheral() { link_role_ = HCI_ROLE_PERIPHERAL; }
465
466 uint8_t signal_id; /* Signalling channel id */
467 uint8_t cur_echo_id; /* Current id value for echo request */
468 uint16_t idle_timeout; /* Idle timeout */
469 private:
470 bool is_bonding_{false}; /* True - link active only for bonding */
471 public:
IsBondingt_l2c_linkcb472 bool IsBonding() const { return is_bonding_; }
SetBondingt_l2c_linkcb473 void SetBonding() { is_bonding_ = true; }
ResetBondingt_l2c_linkcb474 void ResetBonding() { is_bonding_ = false; }
475
476 uint16_t link_xmit_quota; /* Num outstanding pkts allowed */
is_round_robin_schedulingt_l2c_linkcb477 bool is_round_robin_scheduling() const { return link_xmit_quota == 0; }
478
479 uint16_t sent_not_acked; /* Num packets sent but not acked */
update_outstanding_packetst_l2c_linkcb480 void update_outstanding_packets(uint16_t packets_acked) {
481 if (sent_not_acked > packets_acked)
482 sent_not_acked -= packets_acked;
483 else
484 sent_not_acked = 0;
485 }
486
487 bool w4_info_rsp; /* true when info request is active */
488 uint32_t peer_ext_fea; /* Peer's extended features mask */
489 list_t* link_xmit_data_q; /* Link transmit data buffer queue */
490
491 uint8_t peer_chnl_mask[L2CAP_FIXED_CHNL_ARRAY_SIZE];
492
493 tL2CAP_PRIORITY acl_priority;
is_normal_priorityt_l2c_linkcb494 bool is_normal_priority() const {
495 return acl_priority == L2CAP_PRIORITY_NORMAL;
496 }
is_high_priorityt_l2c_linkcb497 bool is_high_priority() const { return acl_priority == L2CAP_PRIORITY_HIGH; }
set_priorityt_l2c_linkcb498 bool set_priority(tL2CAP_PRIORITY priority) {
499 if (acl_priority != priority) {
500 acl_priority = priority;
501 return true;
502 }
503 return false;
504 }
505
506 bool use_latency_mode = false;
507 tL2CAP_LATENCY preset_acl_latency = L2CAP_LATENCY_NORMAL;
508 tL2CAP_LATENCY acl_latency = L2CAP_LATENCY_NORMAL;
is_normal_latencyt_l2c_linkcb509 bool is_normal_latency() const { return acl_latency == L2CAP_LATENCY_NORMAL; }
is_low_latencyt_l2c_linkcb510 bool is_low_latency() const { return acl_latency == L2CAP_LATENCY_LOW; }
set_latencyt_l2c_linkcb511 bool set_latency(tL2CAP_LATENCY latency) {
512 if (acl_latency != latency) {
513 acl_latency = latency;
514 return true;
515 }
516 return false;
517 }
518
519 tL2C_CCB* p_fixed_ccbs[L2CAP_NUM_FIXED_CHNLS];
520
521 private:
522 tHCI_REASON disc_reason_{HCI_ERR_UNDEFINED};
523
524 public:
DisconnectReasont_l2c_linkcb525 tHCI_REASON DisconnectReason() const { return disc_reason_; }
SetDisconnectReasont_l2c_linkcb526 void SetDisconnectReason(tHCI_REASON disc_reason) {
527 disc_reason_ = disc_reason;
528 }
529
530 tBT_TRANSPORT transport;
is_transport_br_edrt_l2c_linkcb531 bool is_transport_br_edr() const { return transport == BT_TRANSPORT_BR_EDR; }
is_transport_blet_l2c_linkcb532 bool is_transport_ble() const { return transport == BT_TRANSPORT_LE; }
533
534 uint16_t tx_data_len; /* tx data length used in data length extension */
535 fixed_queue_t* le_sec_pending_q; /* LE coc channels waiting for security check
536 completion */
537 uint8_t sec_act;
538
539 uint8_t conn_update_mask;
540
541 uint16_t min_interval; /* parameters as requested by peripheral */
542 uint16_t max_interval;
543 uint16_t latency;
544 uint16_t timeout;
545 uint16_t min_ce_len;
546 uint16_t max_ce_len;
547
548 #define L2C_BLE_SUBRATE_REQ_DISABLE 0x1 // disable subrate req
549 #define L2C_BLE_NEW_SUBRATE_PARAM 0x2 // new subrate req parameter to be set
550 #define L2C_BLE_SUBRATE_REQ_PENDING 0x4 // waiting for subrate to be completed
551
552 /* subrate req params */
553 uint16_t subrate_min;
554 uint16_t subrate_max;
555 uint16_t max_latency;
556 uint16_t cont_num;
557 uint16_t supervision_tout;
558
559 uint8_t subrate_req_mask;
560
561 /* each priority group is limited burst transmission */
562 /* round robin service for the same priority channels */
563 tL2C_RR_SERV rr_serv[L2CAP_NUM_CHNL_PRIORITY];
564 uint8_t rr_pri; /* current serving priority group */
565
566 /* Pending ECOC reconfiguration data */
567 tL2CAP_LE_CFG_INFO pending_ecoc_reconfig_cfg;
568 uint8_t pending_ecoc_reconfig_cnt;
569
570 /* This is to keep list of local cids use in the
571 * credit based connection response.
572 */
573 uint16_t pending_ecoc_connection_cids[L2CAP_CREDIT_BASED_MAX_CIDS];
574 uint8_t pending_ecoc_conn_cnt;
575
576 uint16_t pending_lead_cid;
577 uint16_t pending_l2cap_result;
578
number_of_active_dynamic_channelst_l2c_linkcb579 unsigned number_of_active_dynamic_channels() const {
580 unsigned cnt = 0;
581 const tL2C_CCB* cur = ccb_queue.p_first_ccb;
582 while (cur != nullptr) {
583 cnt++;
584 cur = cur->p_next_ccb;
585 }
586 return cnt;
587 }
588 } tL2C_LCB;
589
590 /* Define the L2CAP control structure
591 */
592 typedef struct {
593 uint8_t l2cap_trace_level;
594 uint16_t controller_xmit_window; /* Total ACL window for all links */
595
596 uint16_t round_robin_quota; /* Round-robin link quota */
597 uint16_t round_robin_unacked; /* Round-robin unacked */
is_classic_round_robin_quota_available__anonaddf187a0e08598 bool is_classic_round_robin_quota_available() const {
599 return round_robin_unacked < round_robin_quota;
600 }
update_outstanding_classic_packets__anonaddf187a0e08601 void update_outstanding_classic_packets(uint16_t num_packets_acked) {
602 if (round_robin_unacked > num_packets_acked)
603 round_robin_unacked -= num_packets_acked;
604 else
605 round_robin_unacked = 0;
606 }
607
608 bool check_round_robin; /* Do a round robin check */
609
610 bool is_cong_cback_context;
611
612 tL2C_LCB lcb_pool[MAX_L2CAP_LINKS]; /* Link Control Block pool */
613 tL2C_CCB ccb_pool[MAX_L2CAP_CHANNELS]; /* Channel Control Block pool */
614 tL2C_RCB rcb_pool[MAX_L2CAP_CLIENTS]; /* Registration info pool */
615
616 tL2C_CCB* p_free_ccb_first; /* Pointer to first free CCB */
617 tL2C_CCB* p_free_ccb_last; /* Pointer to last free CCB */
618
619 bool disallow_switch; /* false, to allow switch at create conn */
620 uint16_t num_lm_acl_bufs; /* # of ACL buffers on controller */
621 uint16_t idle_timeout; /* Idle timeout */
622
623 tL2C_LCB* p_cur_hcit_lcb; /* Current HCI Transport buffer */
624 uint16_t num_used_lcbs; /* Number of active link control blocks */
625
626 uint16_t non_flushable_pbf; /* L2CAP_PKT_START_NON_FLUSHABLE if controller
627 supports */
628 /* Otherwise, L2CAP_PKT_START */
629
630 #if (L2CAP_CONFORMANCE_TESTING == TRUE)
631 uint32_t test_info_resp; /* Conformance testing needs a dynamic response */
632 #endif
633
634 tL2CAP_FIXED_CHNL_REG
635 fixed_reg[L2CAP_NUM_FIXED_CHNLS]; /* Reg info for fixed channels */
636
637 uint16_t num_ble_links_active; /* Number of LE links active */
638 uint16_t controller_le_xmit_window; /* Total ACL window for all links */
639 tL2C_BLE_FIXED_CHNLS_MASK l2c_ble_fixed_chnls_mask; // LE fixed channels mask
640 uint16_t num_lm_ble_bufs; /* # of ACL buffers on controller */
641 uint16_t ble_round_robin_quota; /* Round-robin link quota */
642 uint16_t ble_round_robin_unacked; /* Round-robin unacked */
is_ble_round_robin_quota_available__anonaddf187a0e08643 bool is_ble_round_robin_quota_available() const {
644 return ble_round_robin_unacked < ble_round_robin_quota;
645 }
update_outstanding_le_packets__anonaddf187a0e08646 void update_outstanding_le_packets(uint16_t num_packets_acked) {
647 if (ble_round_robin_unacked > num_packets_acked)
648 ble_round_robin_unacked -= num_packets_acked;
649 else
650 ble_round_robin_unacked = 0;
651 }
652
653 bool ble_check_round_robin; /* Do a round robin check */
654 tL2C_RCB ble_rcb_pool[BLE_MAX_L2CAP_CLIENTS]; /* Registration info pool */
655
656 uint16_t le_dyn_psm; /* Next LE dynamic PSM value to try to assign */
657 bool le_dyn_psm_assigned[LE_DYNAMIC_PSM_RANGE]; /* Table of assigned LE PSM */
658
659 } tL2C_CB;
660
661 /* Define a structure that contains the information about a connection.
662 * This structure is used to pass between functions, and not all the
663 * fields will always be filled in.
664 */
665 typedef struct {
666 RawAddress bd_addr; /* Remote BD address */
667 uint8_t status; /* Connection status */
668 uint16_t psm; /* PSM of the connection */
669 uint16_t l2cap_result; /* L2CAP result */
670 uint16_t l2cap_status; /* L2CAP status */
671 uint16_t remote_cid; /* Remote CID */
672 std::vector<uint16_t> lcids; /* Used when credit based is used*/
673 uint16_t peer_mtu; /* Peer MTU */
674 } tL2C_CONN_INFO;
675
676 typedef struct {
677 bool is_active; /* is channel active */
678 uint16_t local_cid; /* Remote CID */
679 tL2C_CCB* p_ccb; /* CCB */
680 } tL2C_AVDT_CHANNEL_INFO;
681
682 typedef void(tL2C_FCR_MGMT_EVT_HDLR)(uint8_t, tL2C_CCB*);
683
684 /* The offset in a buffer that L2CAP will use when building commands.
685 */
686 #define L2CAP_SEND_CMD_OFFSET 0
687
688 /* Number of ACL buffers to use for high priority channel
689 */
690 #define L2CAP_HIGH_PRI_MIN_XMIT_QUOTA_A (L2CAP_HIGH_PRI_MIN_XMIT_QUOTA)
691
692 /* L2CAP global data
693 ***********************************
694 */
695 extern tL2C_CB l2cb;
696
697 /* Functions provided by l2c_main.cc
698 ***********************************
699 */
700
701 void l2c_receive_hold_timer_timeout(void* data);
702 void l2c_ccb_timer_timeout(void* data);
703 void l2c_lcb_timer_timeout(void* data);
704 void l2c_fcrb_ack_timer_timeout(void* data);
705 uint8_t l2c_data_write(uint16_t cid, BT_HDR* p_data, uint16_t flag);
706
707 tL2C_LCB* l2cu_allocate_lcb(const RawAddress& p_bd_addr, bool is_bonding,
708 tBT_TRANSPORT transport);
709 void l2cu_release_lcb(tL2C_LCB* p_lcb);
710 tL2C_LCB* l2cu_find_lcb_by_bd_addr(const RawAddress& p_bd_addr,
711 tBT_TRANSPORT transport);
712 tL2C_LCB* l2cu_find_lcb_by_handle(uint16_t handle);
713
714 bool l2cu_set_acl_priority(const RawAddress& bd_addr, tL2CAP_PRIORITY priority,
715 bool reset_after_rs);
716 bool l2cu_set_acl_latency(const RawAddress& bd_addr, tL2CAP_LATENCY latency);
717
718 void l2cu_enqueue_ccb(tL2C_CCB* p_ccb);
719 void l2cu_dequeue_ccb(tL2C_CCB* p_ccb);
720 void l2cu_change_pri_ccb(tL2C_CCB* p_ccb, tL2CAP_CHNL_PRIORITY priority);
721
722 tL2C_CCB* l2cu_allocate_ccb(tL2C_LCB* p_lcb, uint16_t cid);
723 void l2cu_release_ccb(tL2C_CCB* p_ccb);
724 tL2C_CCB* l2cu_find_ccb_by_cid(tL2C_LCB* p_lcb, uint16_t local_cid);
725 tL2C_CCB* l2cu_find_ccb_by_remote_cid(tL2C_LCB* p_lcb, uint16_t remote_cid);
726 bool l2c_is_cmd_rejected(uint8_t cmd_code, uint8_t id, tL2C_LCB* p_lcb);
727
728 void l2cu_send_peer_cmd_reject(tL2C_LCB* p_lcb, uint16_t reason, uint8_t rem_id,
729 uint16_t p1, uint16_t p2);
730 void l2cu_send_peer_connect_req(tL2C_CCB* p_ccb);
731 void l2cu_send_peer_connect_rsp(tL2C_CCB* p_ccb, uint16_t result,
732 uint16_t status);
733 void l2cu_send_peer_config_req(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
734 void l2cu_send_peer_config_rsp(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
735 void l2cu_send_peer_config_rej(tL2C_CCB* p_ccb, uint8_t* p_data,
736 uint16_t data_len, uint16_t rej_len);
737 void l2cu_send_peer_disc_req(tL2C_CCB* p_ccb);
738 void l2cu_send_peer_disc_rsp(tL2C_LCB* p_lcb, uint8_t remote_id,
739 uint16_t local_cid, uint16_t remote_cid);
740 void l2cu_send_peer_echo_rsp(tL2C_LCB* p_lcb, uint8_t id, uint8_t* p_data,
741 uint16_t data_len);
742 void l2cu_send_peer_info_rsp(tL2C_LCB* p_lcb, uint8_t id, uint16_t info_type);
743 void l2cu_reject_connection(tL2C_LCB* p_lcb, uint16_t remote_cid,
744 uint8_t rem_id, uint16_t result);
745 void l2cu_send_peer_info_req(tL2C_LCB* p_lcb, uint16_t info_type);
746 void l2cu_set_acl_hci_header(BT_HDR* p_buf, tL2C_CCB* p_ccb);
747 void l2cu_check_channel_congestion(tL2C_CCB* p_ccb);
748 void l2cu_disconnect_chnl(tL2C_CCB* p_ccb);
749
750 void l2cu_send_peer_ble_par_req(tL2C_LCB* p_lcb, uint16_t min_int,
751 uint16_t max_int, uint16_t latency,
752 uint16_t timeout);
753 void l2cu_send_peer_ble_par_rsp(tL2C_LCB* p_lcb, uint16_t reason,
754 uint8_t rem_id);
755 void l2cu_reject_ble_connection(tL2C_CCB* p_ccb, uint8_t rem_id,
756 uint16_t result);
757 void l2cu_reject_credit_based_conn_req(tL2C_LCB* p_lcb, uint8_t rem_id,
758 uint8_t num_of_channels,
759 uint16_t result);
760 void l2cu_reject_ble_coc_connection(tL2C_LCB* p_lcb, uint8_t rem_id,
761 uint16_t result);
762 void l2cu_send_peer_ble_credit_based_conn_res(tL2C_CCB* p_ccb, uint16_t result);
763 void l2cu_send_peer_credit_based_conn_res(tL2C_CCB* p_ccb,
764 std::vector<uint16_t>& accepted_lcids,
765 uint16_t result);
766
767 void l2cu_send_peer_ble_credit_based_conn_req(tL2C_CCB* p_ccb);
768 void l2cu_send_peer_credit_based_conn_req(tL2C_CCB* p_ccb);
769
770 void l2cu_send_ble_reconfig_rsp(tL2C_LCB* p_lcb, uint8_t rem_id,
771 uint16_t result);
772 void l2cu_send_credit_based_reconfig_req(tL2C_CCB* p_ccb,
773 tL2CAP_LE_CFG_INFO* p_data);
774
775 void l2cu_send_peer_ble_flow_control_credit(tL2C_CCB* p_ccb,
776 uint16_t credit_value);
777 void l2cu_send_peer_ble_credit_based_disconn_req(tL2C_CCB* p_ccb);
778
779 bool l2cu_initialize_fixed_ccb(tL2C_LCB* p_lcb, uint16_t fixed_cid);
780 void l2cu_no_dynamic_ccbs(tL2C_LCB* p_lcb);
781 void l2cu_process_fixed_chnl_resp(tL2C_LCB* p_lcb);
782 bool l2cu_is_ccb_active(tL2C_CCB* p_ccb);
783 uint16_t le_result_to_l2c_conn(uint16_t result);
784
785 /* Functions provided for Broadcom Aware
786 ***************************************
787 */
788
789 tL2C_RCB* l2cu_allocate_rcb(uint16_t psm);
790 tL2C_RCB* l2cu_find_rcb_by_psm(uint16_t psm);
791 void l2cu_release_rcb(tL2C_RCB* p_rcb);
792 void l2cu_release_ble_rcb(tL2C_RCB* p_rcb);
793 tL2C_RCB* l2cu_allocate_ble_rcb(uint16_t psm);
794 tL2C_RCB* l2cu_find_ble_rcb_by_psm(uint16_t psm);
795
796 uint8_t l2cu_process_peer_cfg_req(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
797 void l2cu_process_peer_cfg_rsp(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
798 void l2cu_process_our_cfg_req(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
799 void l2cu_process_our_cfg_rsp(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
800
801 tL2C_LCB* l2cu_find_lcb_by_state(tL2C_LINK_STATE state);
802 bool l2cu_lcb_disconnecting(void);
803
804 void l2cu_create_conn_br_edr(tL2C_LCB* p_lcb);
805 bool l2cu_create_conn_le(tL2C_LCB* p_lcb);
806 void l2cu_create_conn_after_switch(tL2C_LCB* p_lcb);
807 void l2cu_adjust_out_mps(tL2C_CCB* p_ccb);
808
809 /* Functions provided by l2c_link.cc
810 ***********************************
811 */
812 void l2c_link_timeout(tL2C_LCB* p_lcb);
813 void l2c_info_resp_timer_timeout(void* data);
814 void l2c_link_check_send_pkts(tL2C_LCB* p_lcb, uint16_t local_cid,
815 BT_HDR* p_buf);
816 void l2c_link_adjust_allocation(void);
817
818 void l2c_link_sec_comp(const RawAddress* p_bda, tBT_TRANSPORT trasnport,
819 void* p_ref_data, tBTM_STATUS status);
820 void l2c_link_sec_comp2(const RawAddress& p_bda, tBT_TRANSPORT trasnport,
821 void* p_ref_data, tBTM_STATUS status);
822 void l2c_link_adjust_chnl_allocation(void);
823
824 #if (L2CAP_CONFORMANCE_TESTING == TRUE)
825 /* Used only for conformance testing */
826 void l2cu_set_info_rsp_mask(uint32_t mask);
827 #endif
828
829 /* Functions provided by l2c_csm.cc
830 ***********************************
831 */
832 void l2c_csm_execute(tL2C_CCB* p_ccb, tL2CEVT event, void* p_data);
833
834 void l2c_enqueue_peer_data(tL2C_CCB* p_ccb, BT_HDR* p_buf);
835
836 /* Functions provided by l2c_fcr.cc
837 ***********************************
838 */
839 void l2c_fcr_cleanup(tL2C_CCB* p_ccb);
840 void l2c_fcr_proc_pdu(tL2C_CCB* p_ccb, BT_HDR* p_buf);
841 void l2c_fcr_proc_tout(tL2C_CCB* p_ccb);
842 void l2c_fcr_proc_ack_tout(tL2C_CCB* p_ccb);
843 void l2c_fcr_send_S_frame(tL2C_CCB* p_ccb, uint16_t function_code,
844 uint16_t pf_bit);
845 BT_HDR* l2c_fcr_clone_buf(BT_HDR* p_buf, uint16_t new_offset,
846 uint16_t no_of_bytes);
847 bool l2c_fcr_is_flow_controlled(tL2C_CCB* p_ccb);
848 BT_HDR* l2c_fcr_get_next_xmit_sdu_seg(tL2C_CCB* p_ccb,
849 uint16_t max_packet_length);
850 void l2c_fcr_start_timer(tL2C_CCB* p_ccb);
851 void l2c_lcc_proc_pdu(tL2C_CCB* p_ccb, BT_HDR* p_buf);
852 BT_HDR* l2c_lcc_get_next_xmit_sdu_seg(tL2C_CCB* p_ccb, bool* last_piece_of_sdu);
853
854 /* Configuration negotiation */
855 uint8_t l2c_fcr_chk_chan_modes(tL2C_CCB* p_ccb);
856
857 void l2c_fcr_adj_our_rsp_options(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_peer_cfg);
858 bool l2c_fcr_renegotiate_chan(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
859 uint8_t l2c_fcr_process_peer_cfg_req(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg);
860 void l2c_fcr_adj_monitor_retran_timeout(tL2C_CCB* p_ccb);
861 void l2c_fcr_stop_timer(tL2C_CCB* p_ccb);
862
863 /* Functions provided by l2c_ble.cc
864 ***********************************
865 */
866 bool l2cble_create_conn(tL2C_LCB* p_lcb);
867 void l2cble_process_sig_cmd(tL2C_LCB* p_lcb, uint8_t* p, uint16_t pkt_len);
868 void l2c_ble_link_adjust_allocation(void);
869
870 void l2cble_credit_based_conn_req(tL2C_CCB* p_ccb);
871 void l2cble_credit_based_conn_res(tL2C_CCB* p_ccb, uint16_t result);
872 void l2cble_send_peer_disc_req(tL2C_CCB* p_ccb);
873 void l2cble_send_flow_control_credit(tL2C_CCB* p_ccb, uint16_t credit_value);
874 tL2CAP_LE_RESULT_CODE l2ble_sec_access_req(const RawAddress& bd_addr,
875 uint16_t psm, bool is_originator,
876 tL2CAP_SEC_CBACK* p_callback,
877 void* p_ref_data);
878
879 void l2cble_update_data_length(tL2C_LCB* p_lcb);
880
881 void l2cu_process_fixed_disc_cback(tL2C_LCB* p_lcb);
882
883 void l2cble_process_subrate_change_evt(uint16_t handle, uint8_t status,
884 uint16_t subrate_factor,
885 uint16_t peripheral_latency,
886 uint16_t cont_num, uint16_t timeout);
887
888 #endif
889