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 #ifndef L2CDEFS_H
20 #define L2CDEFS_H
21
22 #include <cstdint>
23 /* L2CAP command codes
24 */
25 #define L2CAP_CMD_REJECT 0x01
26 #define L2CAP_CMD_CONN_REQ 0x02
27 #define L2CAP_CMD_CONN_RSP 0x03
28 #define L2CAP_CMD_CONFIG_REQ 0x04
29 #define L2CAP_CMD_CONFIG_RSP 0x05
30 #define L2CAP_CMD_DISC_REQ 0x06
31 #define L2CAP_CMD_DISC_RSP 0x07
32 #define L2CAP_CMD_ECHO_REQ 0x08
33 #define L2CAP_CMD_ECHO_RSP 0x09
34 #define L2CAP_CMD_INFO_REQ 0x0A
35 #define L2CAP_CMD_INFO_RSP 0x0B
36 #define L2CAP_CMD_AMP_CONN_REQ 0x0C
37 #define L2CAP_CMD_AMP_MOVE_REQ 0x0E
38 #define L2CAP_CMD_BLE_UPDATE_REQ 0x12
39 #define L2CAP_CMD_BLE_UPDATE_RSP 0x13
40 #define L2CAP_CMD_BLE_CREDIT_BASED_CONN_REQ 0x14
41 #define L2CAP_CMD_BLE_CREDIT_BASED_CONN_RES 0x15
42 #define L2CAP_CMD_BLE_FLOW_CTRL_CREDIT 0x16
43 /* Enhanced CoC */
44 #define L2CAP_CMD_CREDIT_BASED_CONN_REQ 0x17
45 #define L2CAP_CMD_CREDIT_BASED_CONN_RES 0x18
46 #define L2CAP_CMD_CREDIT_BASED_RECONFIG_REQ 0x19
47 #define L2CAP_CMD_CREDIT_BASED_RECONFIG_RES 0x1A
48
49 /* Define some packet and header lengths
50 */
51 /* Length and CID */
52 #define L2CAP_PKT_OVERHEAD 4
53 /* Cmd code, Id and length */
54 #define L2CAP_CMD_OVERHEAD 4
55 /* Reason (data is optional) */
56 #define L2CAP_CMD_REJECT_LEN 2
57 /* PSM and source CID */
58 #define L2CAP_CONN_REQ_LEN 4
59 /* Dest CID, source CID, reason, status */
60 #define L2CAP_CONN_RSP_LEN 8
61 /* Dest CID, flags (data is optional) */
62 #define L2CAP_CONFIG_REQ_LEN 4
63 /* Dest CID, flags, result,data optional*/
64 #define L2CAP_CONFIG_RSP_LEN 6
65 /* Dest CID, source CID */
66 #define L2CAP_DISC_REQ_LEN 4
67 /* Dest CID, source CID */
68 #define L2CAP_DISC_RSP_LEN 4
69 /* Data is optional */
70 #define L2CAP_ECHO_REQ_LEN 0
71 /* Data is optional */
72 #define L2CAP_ECHO_RSP_LEN 0
73 /* Info type, result (data is optional) */
74 #define L2CAP_INFO_RSP_LEN 4
75
76 /* Min and max interval, latency, tout */
77 #define L2CAP_CMD_BLE_UPD_REQ_LEN 8
78 /* Result */
79 #define L2CAP_CMD_BLE_UPD_RSP_LEN 2
80
81 /* LE_PSM, SCID, MTU, MPS, Init Credit */
82 #define L2CAP_CMD_BLE_CREDIT_BASED_CONN_REQ_LEN 10
83 /* DCID, MTU, MPS, Init credit, Result */
84 #define L2CAP_CMD_BLE_CREDIT_BASED_CONN_RES_LEN 10
85 /* CID, Credit */
86 #define L2CAP_CMD_BLE_FLOW_CTRL_CREDIT_LEN 4
87
88 /* LE PSM, MTU, MPS, Initial Credits, SCIDS[] */
89 #define L2CAP_CMD_CREDIT_BASED_CONN_REQ_MIN_LEN 8
90 /* MTU, MPS, Initial Credits, Result, DCIDS[] */
91 #define L2CAP_CMD_CREDIT_BASED_CONN_RES_MIN_LEN 8
92
93 /* MTU, MPS, DCIDS[] */
94 #define L2CAP_CMD_CREDIT_BASED_RECONFIG_REQ_MIN_LEN 4
95 /* Result */
96 #define L2CAP_CMD_CREDIT_BASED_RECONFIG_RES_LEN 2
97
98 /* Define the packet boundary flags
99 */
100 #define L2CAP_PKT_START_NON_FLUSHABLE 0
101 #define L2CAP_PKT_START 2
102 #define L2CAP_PKT_CONTINUE 1
103 #define L2CAP_PKT_TYPE_SHIFT 12
104
105 #define L2CAP_CONN_INTERNAL_MASK 0xF000
106 #define L2CAP_CONN_LE_MASK 0xFF00
107
108 /* Define the LE L2CAP Connection Response Result codes
109 */
110 typedef enum : uint8_t {
111 L2CAP_LE_RESULT_CONN_OK = 0,
112 L2CAP_LE_RESULT_NO_PSM = 2,
113 L2CAP_LE_RESULT_NO_RESOURCES = 4,
114 L2CAP_LE_RESULT_INSUFFICIENT_AUTHENTICATION = 5,
115 L2CAP_LE_RESULT_INSUFFICIENT_AUTHORIZATION = 6,
116 L2CAP_LE_RESULT_INSUFFICIENT_ENCRYP_KEY_SIZE = 7,
117 L2CAP_LE_RESULT_INSUFFICIENT_ENCRYP = 8,
118 /* We don't like peer device response */
119 L2CAP_LE_RESULT_INVALID_SOURCE_CID = 9,
120 L2CAP_LE_RESULT_SOURCE_CID_ALREADY_ALLOCATED = 0x0A,
121 L2CAP_LE_RESULT_UNACCEPTABLE_PARAMETERS = 0x0B,
122 L2CAP_LE_RESULT_INVALID_PARAMETERS = 0x0C
123 } tL2CAP_LE_RESULT_CODE;
124
125 /* Define the L2CAP connection result codes */
126 typedef enum : uint16_t {
127 L2CAP_CONN_OK = 0,
128 L2CAP_CONN_PENDING = 1,
129 L2CAP_CONN_NO_PSM = 2,
130 L2CAP_CONN_SECURITY_BLOCK = 3,
131 L2CAP_CONN_NO_RESOURCES = 4,
132 L2CAP_CONN_TIMEOUT = 0xEEEE,
133 /* Generic L2CAP conn failure reasons */
134 L2CAP_CONN_OTHER_ERROR = L2CAP_CONN_INTERNAL_MASK,
135 L2CAP_CONN_ACL_CONNECTION_FAILED = L2CAP_CONN_INTERNAL_MASK + 1,
136 L2CAP_CONN_CLIENT_SECURITY_CLEARANCE_FAILED = L2CAP_CONN_INTERNAL_MASK + 2,
137 L2CAP_CONN_NO_LINK = L2CAP_CONN_INTERNAL_MASK + 3,
138 L2CAP_CONN_CANCEL =
139 L2CAP_CONN_INTERNAL_MASK + 4, /* L2CAP connection cancelled */
140 /* For LE result codes converted to L2CAP conn failure code */
141 L2CAP_CONN_INSUFFICIENT_AUTHENTICATION =
142 L2CAP_CONN_LE_MASK + L2CAP_LE_RESULT_INSUFFICIENT_AUTHENTICATION,
143 L2CAP_CONN_INSUFFICIENT_AUTHORIZATION =
144 L2CAP_CONN_LE_MASK + L2CAP_LE_RESULT_INSUFFICIENT_AUTHORIZATION,
145 L2CAP_CONN_INSUFFICIENT_ENCRYP_KEY_SIZE =
146 L2CAP_CONN_LE_MASK + L2CAP_LE_RESULT_INSUFFICIENT_ENCRYP_KEY_SIZE,
147 L2CAP_CONN_INSUFFICIENT_ENCRYP =
148 L2CAP_CONN_LE_MASK + L2CAP_LE_RESULT_INSUFFICIENT_ENCRYP,
149 L2CAP_CONN_INVALID_SOURCE_CID =
150 L2CAP_CONN_LE_MASK + L2CAP_LE_RESULT_INVALID_SOURCE_CID,
151 L2CAP_CONN_SOURCE_CID_ALREADY_ALLOCATED =
152 L2CAP_CONN_LE_MASK + L2CAP_LE_RESULT_SOURCE_CID_ALREADY_ALLOCATED,
153 L2CAP_CONN_UNACCEPTABLE_PARAMETERS =
154 L2CAP_CONN_LE_MASK + L2CAP_LE_RESULT_UNACCEPTABLE_PARAMETERS,
155 L2CAP_CONN_INVALID_PARAMETERS =
156 L2CAP_CONN_LE_MASK + L2CAP_LE_RESULT_INVALID_PARAMETERS,
157 } tL2CAP_CONN;
158
159 #ifndef CASE_RETURN_TEXT
160 #define CASE_RETURN_TEXT(code) \
161 case code: \
162 return #code
163 #endif
164
l2cap_result_code_text(const tL2CAP_CONN & result)165 inline std::string l2cap_result_code_text(const tL2CAP_CONN& result) {
166 switch (result) {
167 CASE_RETURN_TEXT(L2CAP_CONN_OK);
168 CASE_RETURN_TEXT(L2CAP_CONN_PENDING);
169 CASE_RETURN_TEXT(L2CAP_CONN_NO_PSM);
170 CASE_RETURN_TEXT(L2CAP_CONN_SECURITY_BLOCK);
171 CASE_RETURN_TEXT(L2CAP_CONN_NO_RESOURCES);
172 CASE_RETURN_TEXT(L2CAP_CONN_TIMEOUT);
173 CASE_RETURN_TEXT(L2CAP_CONN_OTHER_ERROR);
174 CASE_RETURN_TEXT(L2CAP_CONN_ACL_CONNECTION_FAILED);
175 CASE_RETURN_TEXT(L2CAP_CONN_CLIENT_SECURITY_CLEARANCE_FAILED);
176 CASE_RETURN_TEXT(L2CAP_CONN_NO_LINK);
177 CASE_RETURN_TEXT(L2CAP_CONN_CANCEL);
178 CASE_RETURN_TEXT(L2CAP_CONN_INSUFFICIENT_AUTHENTICATION);
179 CASE_RETURN_TEXT(L2CAP_CONN_INSUFFICIENT_AUTHORIZATION);
180 CASE_RETURN_TEXT(L2CAP_CONN_INSUFFICIENT_ENCRYP_KEY_SIZE);
181 CASE_RETURN_TEXT(L2CAP_CONN_INSUFFICIENT_ENCRYP);
182 CASE_RETURN_TEXT(L2CAP_CONN_INVALID_SOURCE_CID);
183 CASE_RETURN_TEXT(L2CAP_CONN_SOURCE_CID_ALREADY_ALLOCATED);
184 CASE_RETURN_TEXT(L2CAP_CONN_UNACCEPTABLE_PARAMETERS);
185 CASE_RETURN_TEXT(L2CAP_CONN_INVALID_PARAMETERS);
186 default:
187 return std::string("UNKNOWN[") + std::to_string(result) +
188 std::string("]");
189 }
190 }
191 #undef CASE_RETURN_TEXT
192
to_l2cap_result_code(uint16_t result)193 inline tL2CAP_CONN to_l2cap_result_code(uint16_t result) {
194 return static_cast<tL2CAP_CONN>(result);
195 }
196
l2cap_le_result_code_text(const tL2CAP_LE_RESULT_CODE & code)197 inline std::string l2cap_le_result_code_text(
198 const tL2CAP_LE_RESULT_CODE& code) {
199 switch (code) {
200 case L2CAP_LE_RESULT_CONN_OK:
201 return std::string("le connection success");
202 case L2CAP_LE_RESULT_NO_PSM:
203 return std::string("le no psm service");
204 case L2CAP_LE_RESULT_NO_RESOURCES:
205 return std::string("le no resources");
206 case L2CAP_LE_RESULT_INSUFFICIENT_AUTHENTICATION:
207 return std::string("le authentication failed");
208 case L2CAP_LE_RESULT_INSUFFICIENT_AUTHORIZATION:
209 return std::string("le authorization failed");
210 case L2CAP_LE_RESULT_INSUFFICIENT_ENCRYP_KEY_SIZE:
211 return std::string("le encryption key size failed");
212 case L2CAP_LE_RESULT_INSUFFICIENT_ENCRYP:
213 return std::string("le encryption failed");
214 case L2CAP_LE_RESULT_INVALID_SOURCE_CID:
215 return std::string("le invalid source channel identifier");
216 case L2CAP_LE_RESULT_SOURCE_CID_ALREADY_ALLOCATED:
217 return std::string("le source channel identifier busy");
218 case L2CAP_LE_RESULT_UNACCEPTABLE_PARAMETERS:
219 return std::string("le unacceptable parameters");
220 case L2CAP_LE_RESULT_INVALID_PARAMETERS:
221 return std::string("invalid parameters");
222 }
223 }
224
225 /* Credit based reconfig results code */
226 #define L2CAP_RECONFIG_SUCCEED 0
227 #define L2CAP_RECONFIG_REDUCTION_MTU_NO_ALLOWED 1
228 #define L2CAP_RECONFIG_REDUCTION_MPS_NO_ALLOWED 2
229 #define L2CAP_RECONFIG_INVALID_DCID 3
230 #define L2CAP_RECONFIG_UNACCAPTED_PARAM 4
231
232 /* Define the L2CAP command reject reason codes
233 */
234 #define L2CAP_CMD_REJ_NOT_UNDERSTOOD 0
235 #define L2CAP_CMD_REJ_MTU_EXCEEDED 1
236 #define L2CAP_CMD_REJ_INVALID_CID 2
237
238 /* L2CAP Predefined CIDs
239 */
240 enum : uint16_t {
241 L2CAP_SIGNALLING_CID = 1,
242 L2CAP_CONNECTIONLESS_CID = 2,
243 L2CAP_AMP_CID = 3,
244 L2CAP_ATT_CID = 4,
245 L2CAP_BLE_SIGNALLING_CID = 5,
246 L2CAP_SMP_CID = 6,
247 L2CAP_SMP_BR_CID = 7,
248 L2CAP_BASE_APPL_CID = 0x0040,
249 };
250
251 /* Fixed Channels mask bits */
252
253 /* Signal channel supported (Mandatory) */
254 #define L2CAP_FIXED_CHNL_SIG_BIT (1 << L2CAP_SIGNALLING_CID)
255
256 /* Connectionless reception */
257 #define L2CAP_FIXED_CHNL_CNCTLESS_BIT (1 << L2CAP_CONNECTIONLESS_CID)
258
259 /* Attribute protocol supported */
260 #define L2CAP_FIXED_CHNL_ATT_BIT (1 << L2CAP_ATT_CID)
261
262 /* BLE Signalling supported */
263 #define L2CAP_FIXED_CHNL_BLE_SIG_BIT (1 << L2CAP_BLE_SIGNALLING_CID)
264
265 /* BLE Security Mgr supported */
266 #define L2CAP_FIXED_CHNL_SMP_BIT (1 << L2CAP_SMP_CID)
267
268 /* Security Mgr over BR supported */
269 #define L2CAP_FIXED_CHNL_SMP_BR_BIT (1 << L2CAP_SMP_BR_CID)
270
271 /* Define the L2CAP configuration result codes
272 */
273 #define L2CAP_CFG_OK 0
274 #define L2CAP_CFG_UNACCEPTABLE_PARAMS 1
275 #define L2CAP_CFG_FAILED_NO_REASON 2
276 #define L2CAP_CFG_UNKNOWN_OPTIONS 3
277 #define L2CAP_CFG_PENDING 4
278
279 static_assert(L2CAP_CONN_OTHER_ERROR != L2CAP_CFG_FAILED_NO_REASON,
280 "Different error code should be provided for Connect error and "
281 "Config error");
282
283 /* Define the L2CAP configuration option types
284 */
285 #define L2CAP_CFG_TYPE_MTU 0x01
286 #define L2CAP_CFG_TYPE_FLUSH_TOUT 0x02
287 #define L2CAP_CFG_TYPE_QOS 0x03
288 #define L2CAP_CFG_TYPE_FCR 0x04
289 #define L2CAP_CFG_TYPE_FCS 0x05
290 #define L2CAP_CFG_TYPE_EXT_FLOW 0x06
291
292 #define L2CAP_CFG_MTU_OPTION_LEN 2 /* MTU option length */
293 #define L2CAP_CFG_FLUSH_OPTION_LEN 2 /* Flush option len */
294 #define L2CAP_CFG_QOS_OPTION_LEN 22 /* QOS option length */
295 #define L2CAP_CFG_FCR_OPTION_LEN 9 /* FCR option length */
296 #define L2CAP_CFG_FCS_OPTION_LEN 1 /* FCR option length */
297 #define L2CAP_CFG_EXT_FLOW_OPTION_LEN 16 /* Extended Flow Spec */
298 #define L2CAP_CFG_OPTION_OVERHEAD 2 /* Type and length */
299
300 /* Configuration Cmd/Rsp Flags mask
301 */
302 #define L2CAP_CFG_FLAGS_MASK_CONT 0x0001 /* Flags mask: Continuation */
303
304 /* FCS Check Option values
305 */
306 #define L2CAP_CFG_FCS_BYPASS 0 /* Bypass the FCS in streaming or ERTM modes */
307 #define L2CAP_CFG_FCS_USE \
308 1 /* Use the FCS in streaming or ERTM modes [default] */
309
310 /* Default values for configuration
311 */
312 #define L2CAP_NO_AUTOMATIC_FLUSH 0xFFFF
313
314 #define L2CAP_DEFAULT_MTU (672)
315 #define L2CAP_DEFAULT_SERV_TYPE 1
316 #define L2CAP_DEFAULT_TOKEN_RATE 0
317 #define L2CAP_DEFAULT_BUCKET_SIZE 0
318 #define L2CAP_DEFAULT_PEAK_BANDWIDTH 0
319 #define L2CAP_DEFAULT_LATENCY 0xFFFFFFFF
320 #define L2CAP_DEFAULT_DELAY 0xFFFFFFFF
321
322 /* Define the L2CAP disconnect result codes
323 */
324 #define L2CAP_DISC_OK 0
325 #define L2CAP_DISC_TIMEOUT 0xEEEE
326
327 /* Define the L2CAP info resp result codes
328 */
329 #define L2CAP_INFO_RESP_RESULT_SUCCESS 0
330 #define L2CAP_INFO_RESP_RESULT_NOT_SUPPORTED 1
331
332 /* Define the info-type fields of information request & response
333 */
334 #define L2CAP_CONNLESS_MTU_INFO_TYPE 0x0001
335 /* Used in Information Req/Response */
336 #define L2CAP_EXTENDED_FEATURES_INFO_TYPE 0x0002
337 /* Used in AMP */
338 #define L2CAP_FIXED_CHANNELS_INFO_TYPE 0x0003
339
340 /* Connectionless MTU size */
341 #define L2CAP_CONNLESS_MTU_INFO_SIZE 2
342 /* Extended features array size */
343 #define L2CAP_EXTENDED_FEATURES_ARRAY_SIZE 4
344 /* Fixed channel array size */
345 #define L2CAP_FIXED_CHNL_ARRAY_SIZE 8
346
347 /* Extended features mask bits
348 */
349 /* Enhanced retransmission mode */
350 #define L2CAP_EXTFEA_ENH_RETRANS 0x00000008
351 /* Streaming Mode */
352 #define L2CAP_EXTFEA_STREAM_MODE 0x00000010
353 /* Optional FCS (if set No FCS desired) */
354 #define L2CAP_EXTFEA_NO_CRC 0x00000020
355 /* Extended flow spec */
356 #define L2CAP_EXTFEA_EXT_FLOW_SPEC 0x00000040
357 /* Fixed channels */
358 #define L2CAP_EXTFEA_FIXED_CHNLS 0x00000080
359 /* Extended Window Size */
360 #define L2CAP_EXTFEA_EXT_WINDOW 0x00000100
361 /* Unicast Connectionless Data Reception */
362 #define L2CAP_EXTFEA_UCD_RECEPTION 0x00000200
363
364 /* Mask for locally supported features used in Information Response
365 * (default to none) */
366 #ifndef L2CAP_EXTFEA_SUPPORTED_MASK
367 #define L2CAP_EXTFEA_SUPPORTED_MASK 0
368 #endif
369
370 /* Mask for LE supported features used in Information Response
371 * (default to none) */
372 #ifndef L2CAP_BLE_EXTFEA_MASK
373 #define L2CAP_BLE_EXTFEA_MASK 0
374 #endif
375
376 /* Define a value that tells L2CAP to use the default HCI ACL buffer size */
377 #define L2CAP_INVALID_ERM_BUF_SIZE 0
378 /* Define a value that tells L2CAP to use the default MPS */
379 #define L2CAP_DEFAULT_ERM_MPS 0x0000
380
381 #define L2CAP_FCR_OVERHEAD 2 /* Control word */
382 #define L2CAP_FCS_LEN 2 /* FCS takes 2 bytes */
383 #define L2CAP_SDU_LEN_OVERHEAD 2 /* SDU length field is 2 bytes */
384 #define L2CAP_SDU_LEN_OFFSET 2 /* SDU length offset is 2 bytes */
385 #define L2CAP_EXT_CONTROL_OVERHEAD 4 /* Extended Control Field */
386 /* length(2), channel(2), control(4), SDU length(2) FCS(2) */
387 #define L2CAP_MAX_HEADER_FCS \
388 (L2CAP_PKT_OVERHEAD + L2CAP_EXT_CONTROL_OVERHEAD + L2CAP_SDU_LEN_OVERHEAD + \
389 L2CAP_FCS_LEN)
390
391 /* TODO: This value can probably be optimized per transport, and per L2CAP
392 * socket type, but this should not bring any big performance improvements. For
393 * LE CoC, it should be biggest multiple of "PDU length" smaller than 0xffff (so
394 * depend on controller buffer size), for Classic, making it multiple of PDU
395 * length and also of the 3DH5 air including the l2cap headers in each packet.
396 */
397 #define L2CAP_SDU_LENGTH_MAX (8080 + 26 - (L2CAP_MIN_OFFSET + 6))
398 constexpr uint16_t L2CAP_SDU_LENGTH_LE_MAX = 0xffff;
399
400 /* SAR bits in the control word
401 */
402 /* Control word to begin with for unsegmented PDU*/
403 #define L2CAP_FCR_UNSEG_SDU 0x0000
404 /* ...for Starting PDU of a semented SDU */
405 #define L2CAP_FCR_START_SDU 0x4000
406 /* ...for ending PDU of a segmented SDU */
407 #define L2CAP_FCR_END_SDU 0x8000
408 /* ...for continuation PDU of a segmented SDU */
409 #define L2CAP_FCR_CONT_SDU 0xc000
410
411 /* Supervisory frame types */
412 /* Supervisory frame - RR */
413 #define L2CAP_FCR_SUP_RR 0x0000
414 /* Supervisory frame - REJ */
415 #define L2CAP_FCR_SUP_REJ 0x0001
416 /* Supervisory frame - RNR */
417 #define L2CAP_FCR_SUP_RNR 0x0002
418 /* Supervisory frame - SREJ */
419 #define L2CAP_FCR_SUP_SREJ 0x0003
420
421 /* Mask to get the SAR bits from control word */
422 #define L2CAP_FCR_SAR_BITS 0xC000
423 /* Bits to shift right to get the SAR bits from ctrl-word */
424 #define L2CAP_FCR_SAR_BITS_SHIFT 14
425
426 /* Mask to check if a PDU is S-frame */
427 #define L2CAP_FCR_S_FRAME_BIT 0x0001
428 /* Mask to get the req-seq from control word */
429 #define L2CAP_FCR_REQ_SEQ_BITS 0x3F00
430 /* Bits to shift right to get the req-seq from ctrl-word */
431 #define L2CAP_FCR_REQ_SEQ_BITS_SHIFT 8
432 /* Mask on get the tx-seq from control word */
433 #define L2CAP_FCR_TX_SEQ_BITS 0x007E
434 /* Bits to shift right to get the tx-seq from ctrl-word */
435 #define L2CAP_FCR_TX_SEQ_BITS_SHIFT 1
436
437 /* F-bit in the control word (Sup and I frames) */
438 #define L2CAP_FCR_F_BIT 0x0080
439 /* P-bit in the control word (Sup frames only) */
440 #define L2CAP_FCR_P_BIT 0x0010
441
442 #define L2CAP_FCR_F_BIT_SHIFT 7
443 #define L2CAP_FCR_P_BIT_SHIFT 4
444
445 /* Mask to get the segmentation bits from ctrl-word */
446 #define L2CAP_FCR_SEG_BITS 0xC000
447 /* Bits to shift right to get the S-bits from ctrl-word */
448 #define L2CAP_FCR_SUP_SHIFT 2
449 /* Mask to get the supervisory bits from ctrl-word */
450 #define L2CAP_FCR_SUP_BITS 0x000C
451
452 /* Initial state of the CRC register */
453 #define L2CAP_FCR_INIT_CRC 0
454 /* Mask for sequence numbers (range 0 - 63) */
455 #define L2CAP_FCR_SEQ_MODULO 0x3F
456
457 #endif
458