1/****************************************************************************** 2 * 3 * Copyright 2008-2012 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 the main GATT server attributes access request 22 * handling functions. 23 * 24 ******************************************************************************/ 25 26#include "bt_target.h" 27#include "bt_utils.h" 28 29#include "gatt_api.h" 30#include "gatt_int.h" 31#include "osi/include/osi.h" 32 33using base::StringPrintf; 34using bluetooth::Uuid; 35 36#define GATTP_MAX_NUM_INC_SVR 0 37#define GATTP_MAX_CHAR_NUM 2 38#define GATTP_MAX_ATTR_NUM (GATTP_MAX_CHAR_NUM * 2 + GATTP_MAX_NUM_INC_SVR + 1) 39#define GATTP_MAX_CHAR_VALUE_SIZE 50 40 41#ifndef GATTP_ATTR_DB_SIZE 42#define GATTP_ATTR_DB_SIZE \ 43 GATT_DB_MEM_SIZE(GATTP_MAX_NUM_INC_SVR, GATTP_MAX_CHAR_NUM, \ 44 GATTP_MAX_CHAR_VALUE_SIZE) 45#endif 46 47static void gatt_request_cback(uint16_t conn_id, uint32_t trans_id, 48 uint8_t op_code, tGATTS_DATA* p_data); 49static void gatt_connect_cback(UNUSED_ATTR tGATT_IF gatt_if, 50 const RawAddress& bda, uint16_t conn_id, 51 bool connected, tGATT_DISCONN_REASON reason, 52 tBT_TRANSPORT transport); 53static void gatt_disc_res_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, 54 tGATT_DISC_RES* p_data); 55static void gatt_disc_cmpl_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, 56 tGATT_STATUS status); 57static void gatt_cl_op_cmpl_cback(UNUSED_ATTR uint16_t conn_id, 58 UNUSED_ATTR tGATTC_OPTYPE op, 59 UNUSED_ATTR tGATT_STATUS status, 60 UNUSED_ATTR tGATT_CL_COMPLETE* p_data); 61 62static void gatt_cl_start_config_ccc(tGATT_PROFILE_CLCB* p_clcb); 63 64static tGATT_CBACK gatt_profile_cback = {gatt_connect_cback, 65 gatt_cl_op_cmpl_cback, 66 gatt_disc_res_cback, 67 gatt_disc_cmpl_cback, 68 gatt_request_cback, 69 NULL, 70 NULL, 71 NULL, 72 NULL}; 73 74/******************************************************************************* 75 * 76 * Function gatt_profile_find_conn_id_by_bd_addr 77 * 78 * Description Find the connection ID by remote address 79 * 80 * Returns Connection ID 81 * 82 ******************************************************************************/ 83uint16_t gatt_profile_find_conn_id_by_bd_addr(const RawAddress& remote_bda) { 84 uint16_t conn_id = GATT_INVALID_CONN_ID; 85 GATT_GetConnIdIfConnected(gatt_cb.gatt_if, remote_bda, &conn_id, 86 BT_TRANSPORT_LE); 87 if (conn_id == GATT_INVALID_CONN_ID) 88 GATT_GetConnIdIfConnected(gatt_cb.gatt_if, remote_bda, &conn_id, 89 BT_TRANSPORT_BR_EDR); 90 return conn_id; 91} 92 93/******************************************************************************* 94 * 95 * Function gatt_profile_find_clcb_by_conn_id 96 * 97 * Description find clcb by Connection ID 98 * 99 * Returns Pointer to the found link conenction control block. 100 * 101 ******************************************************************************/ 102static tGATT_PROFILE_CLCB* gatt_profile_find_clcb_by_conn_id(uint16_t conn_id) { 103 uint8_t i_clcb; 104 tGATT_PROFILE_CLCB* p_clcb = NULL; 105 106 for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS; 107 i_clcb++, p_clcb++) { 108 if (p_clcb->in_use && p_clcb->conn_id == conn_id) return p_clcb; 109 } 110 111 return NULL; 112} 113 114/******************************************************************************* 115 * 116 * Function gatt_profile_find_clcb_by_bd_addr 117 * 118 * Description The function searches all LCBs with macthing bd address. 119 * 120 * Returns Pointer to the found link conenction control block. 121 * 122 ******************************************************************************/ 123static tGATT_PROFILE_CLCB* gatt_profile_find_clcb_by_bd_addr( 124 const RawAddress& bda, tBT_TRANSPORT transport) { 125 uint8_t i_clcb; 126 tGATT_PROFILE_CLCB* p_clcb = NULL; 127 128 for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS; 129 i_clcb++, p_clcb++) { 130 if (p_clcb->in_use && p_clcb->transport == transport && p_clcb->connected && 131 p_clcb->bda == bda) 132 return p_clcb; 133 } 134 135 return NULL; 136} 137 138/******************************************************************************* 139 * 140 * Function gatt_profile_clcb_alloc 141 * 142 * Description The function allocates a GATT profile connection link 143 * control block 144 * 145 * Returns NULL if not found. Otherwise pointer to the connection link 146 * block. 147 * 148 ******************************************************************************/ 149tGATT_PROFILE_CLCB* gatt_profile_clcb_alloc(uint16_t conn_id, 150 const RawAddress& bda, 151 tBT_TRANSPORT tranport) { 152 uint8_t i_clcb = 0; 153 tGATT_PROFILE_CLCB* p_clcb = NULL; 154 155 for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS; 156 i_clcb++, p_clcb++) { 157 if (!p_clcb->in_use) { 158 p_clcb->in_use = true; 159 p_clcb->conn_id = conn_id; 160 p_clcb->connected = true; 161 p_clcb->transport = tranport; 162 p_clcb->bda = bda; 163 break; 164 } 165 } 166 if (i_clcb < GATT_MAX_APPS) return p_clcb; 167 168 return NULL; 169} 170 171/******************************************************************************* 172 * 173 * Function gatt_profile_clcb_dealloc 174 * 175 * Description The function deallocates a GATT profile connection link 176 * control block 177 * 178 * Returns void 179 * 180 ******************************************************************************/ 181void gatt_profile_clcb_dealloc(tGATT_PROFILE_CLCB* p_clcb) { 182 memset(p_clcb, 0, sizeof(tGATT_PROFILE_CLCB)); 183} 184 185/******************************************************************************* 186 * 187 * Function gatt_request_cback 188 * 189 * Description GATT profile attribute access request callback. 190 * 191 * Returns void. 192 * 193 ******************************************************************************/ 194static void gatt_request_cback(uint16_t conn_id, uint32_t trans_id, 195 tGATTS_REQ_TYPE type, tGATTS_DATA* p_data) { 196 uint8_t status = GATT_INVALID_PDU; 197 tGATTS_RSP rsp_msg; 198 bool ignore = false; 199 200 memset(&rsp_msg, 0, sizeof(tGATTS_RSP)); 201 202 switch (type) { 203 case GATTS_REQ_TYPE_READ_CHARACTERISTIC: 204 case GATTS_REQ_TYPE_READ_DESCRIPTOR: 205 status = GATT_READ_NOT_PERMIT; 206 break; 207 208 case GATTS_REQ_TYPE_WRITE_CHARACTERISTIC: 209 case GATTS_REQ_TYPE_WRITE_DESCRIPTOR: 210 status = GATT_WRITE_NOT_PERMIT; 211 break; 212 213 case GATTS_REQ_TYPE_WRITE_EXEC: 214 case GATT_CMD_WRITE: 215 ignore = true; 216 VLOG(1) << "Ignore GATT_REQ_EXEC_WRITE/WRITE_CMD"; 217 break; 218 219 case GATTS_REQ_TYPE_MTU: 220 VLOG(1) << "Get MTU exchange new mtu size: " << +p_data->mtu; 221 ignore = true; 222 break; 223 224 default: 225 VLOG(1) << "Unknown/unexpected LE GAP ATT request: " << loghex(type); 226 break; 227 } 228 229 if (!ignore) GATTS_SendRsp(conn_id, trans_id, status, &rsp_msg); 230} 231 232/******************************************************************************* 233 * 234 * Function gatt_connect_cback 235 * 236 * Description Gatt profile connection callback. 237 * 238 * Returns void 239 * 240 ******************************************************************************/ 241static void gatt_connect_cback(UNUSED_ATTR tGATT_IF gatt_if, 242 const RawAddress& bda, uint16_t conn_id, 243 bool connected, tGATT_DISCONN_REASON reason, 244 tBT_TRANSPORT transport) { 245 VLOG(1) << __func__ << ": from " << bda << " connected: " << connected 246 << ", conn_id: " << loghex(conn_id) << "reason: " << loghex(reason); 247 248 tGATT_PROFILE_CLCB* p_clcb = 249 gatt_profile_find_clcb_by_bd_addr(bda, transport); 250 if (p_clcb == NULL) return; 251 252 if (connected) { 253 p_clcb->conn_id = conn_id; 254 p_clcb->connected = true; 255 256 if (p_clcb->ccc_stage == GATT_SVC_CHANGED_CONNECTING) { 257 p_clcb->ccc_stage++; 258 gatt_cl_start_config_ccc(p_clcb); 259 } 260 } else { 261 gatt_profile_clcb_dealloc(p_clcb); 262 } 263} 264 265/******************************************************************************* 266 * 267 * Function gatt_profile_db_init 268 * 269 * Description Initializa the GATT profile attribute database. 270 * 271 ******************************************************************************/ 272void gatt_profile_db_init(void) { 273 uint16_t service_handle = 0; 274 275 /* Fill our internal UUID with a fixed pattern 0x81 */ 276 std::array<uint8_t, Uuid::kNumBytes128> tmp; 277 tmp.fill(0x81); 278 279 /* Create a GATT profile service */ 280 gatt_cb.gatt_if = GATT_Register(Uuid::From128BitBE(tmp), &gatt_profile_cback); 281 GATT_StartIf(gatt_cb.gatt_if); 282 283 Uuid service_uuid = Uuid::From16Bit(UUID_SERVCLASS_GATT_SERVER); 284 285 Uuid char_uuid = Uuid::From16Bit(GATT_UUID_GATT_SRV_CHGD); 286 287 btgatt_db_element_t service[] = { 288 {.type = BTGATT_DB_PRIMARY_SERVICE, .uuid = service_uuid}, 289 {.type = BTGATT_DB_CHARACTERISTIC, 290 .uuid = char_uuid, 291 .properties = GATT_CHAR_PROP_BIT_INDICATE, 292 .permissions = 0}}; 293 294 GATTS_AddService(gatt_cb.gatt_if, service, 295 sizeof(service) / sizeof(btgatt_db_element_t)); 296 297 service_handle = service[0].attribute_handle; 298 gatt_cb.handle_of_h_r = service[1].attribute_handle; 299 300 VLOG(1) << __func__ << ": gatt_if=" << +gatt_cb.gatt_if; 301} 302 303/******************************************************************************* 304 * 305 * Function gatt_disc_res_cback 306 * 307 * Description Gatt profile discovery result callback 308 * 309 * Returns void 310 * 311 ******************************************************************************/ 312static void gatt_disc_res_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, 313 tGATT_DISC_RES* p_data) { 314 tGATT_PROFILE_CLCB* p_clcb = gatt_profile_find_clcb_by_conn_id(conn_id); 315 316 if (p_clcb == NULL) return; 317 318 switch (disc_type) { 319 case GATT_DISC_SRVC_BY_UUID: /* stage 1 */ 320 p_clcb->e_handle = p_data->value.group_value.e_handle; 321 p_clcb->ccc_result++; 322 break; 323 324 case GATT_DISC_CHAR: /* stage 2 */ 325 p_clcb->s_handle = p_data->value.dclr_value.val_handle; 326 p_clcb->ccc_result++; 327 break; 328 329 case GATT_DISC_CHAR_DSCPT: /* stage 3 */ 330 if (p_data->type == Uuid::From16Bit(GATT_UUID_CHAR_CLIENT_CONFIG)) { 331 p_clcb->s_handle = p_data->handle; 332 p_clcb->ccc_result++; 333 } 334 break; 335 } 336} 337 338/******************************************************************************* 339 * 340 * Function gatt_disc_cmpl_cback 341 * 342 * Description Gatt profile discovery complete callback 343 * 344 * Returns void 345 * 346 ******************************************************************************/ 347static void gatt_disc_cmpl_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, 348 tGATT_STATUS status) { 349 tGATT_PROFILE_CLCB* p_clcb = gatt_profile_find_clcb_by_conn_id(conn_id); 350 351 if (p_clcb == NULL) return; 352 353 if (status != GATT_SUCCESS || p_clcb->ccc_result == 0) { 354 LOG(WARNING) << __func__ 355 << ": Unable to register for service changed indication"; 356 return; 357 } 358 359 p_clcb->ccc_result = 0; 360 p_clcb->ccc_stage++; 361 gatt_cl_start_config_ccc(p_clcb); 362} 363 364/******************************************************************************* 365 * 366 * Function gatt_cl_op_cmpl_cback 367 * 368 * Description Gatt profile client operation complete callback 369 * 370 * Returns void 371 * 372 ******************************************************************************/ 373static void gatt_cl_op_cmpl_cback(UNUSED_ATTR uint16_t conn_id, 374 UNUSED_ATTR tGATTC_OPTYPE op, 375 UNUSED_ATTR tGATT_STATUS status, 376 UNUSED_ATTR tGATT_CL_COMPLETE* p_data) {} 377 378/******************************************************************************* 379 * 380 * Function gatt_cl_start_config_ccc 381 * 382 * Description Gatt profile start configure service change CCC 383 * 384 * Returns void 385 * 386 ******************************************************************************/ 387static void gatt_cl_start_config_ccc(tGATT_PROFILE_CLCB* p_clcb) { 388 tGATT_DISC_PARAM srvc_disc_param; 389 tGATT_VALUE ccc_value; 390 391 VLOG(1) << __func__ << ": stage: " << +p_clcb->ccc_stage; 392 393 memset(&srvc_disc_param, 0, sizeof(tGATT_DISC_PARAM)); 394 memset(&ccc_value, 0, sizeof(tGATT_VALUE)); 395 396 switch (p_clcb->ccc_stage) { 397 case GATT_SVC_CHANGED_SERVICE: /* discover GATT service */ 398 srvc_disc_param.s_handle = 1; 399 srvc_disc_param.e_handle = 0xffff; 400 srvc_disc_param.service = Uuid::From16Bit(UUID_SERVCLASS_GATT_SERVER); 401 GATTC_Discover(p_clcb->conn_id, GATT_DISC_SRVC_BY_UUID, &srvc_disc_param); 402 break; 403 404 case GATT_SVC_CHANGED_CHARACTERISTIC: /* discover service change char */ 405 srvc_disc_param.s_handle = 1; 406 srvc_disc_param.e_handle = p_clcb->e_handle; 407 srvc_disc_param.service = Uuid::From16Bit(GATT_UUID_GATT_SRV_CHGD); 408 GATTC_Discover(p_clcb->conn_id, GATT_DISC_CHAR, &srvc_disc_param); 409 break; 410 411 case GATT_SVC_CHANGED_DESCRIPTOR: /* discover service change ccc */ 412 srvc_disc_param.s_handle = p_clcb->s_handle; 413 srvc_disc_param.e_handle = p_clcb->e_handle; 414 GATTC_Discover(p_clcb->conn_id, GATT_DISC_CHAR_DSCPT, &srvc_disc_param); 415 break; 416 417 case GATT_SVC_CHANGED_CONFIGURE_CCCD: /* write ccc */ 418 ccc_value.handle = p_clcb->s_handle; 419 ccc_value.len = 2; 420 ccc_value.value[0] = GATT_CLT_CONFIG_INDICATION; 421 GATTC_Write(p_clcb->conn_id, GATT_WRITE, &ccc_value); 422 break; 423 } 424} 425 426/******************************************************************************* 427 * 428 * Function GATT_ConfigServiceChangeCCC 429 * 430 * Description Configure service change indication on remote device 431 * 432 * Returns none 433 * 434 ******************************************************************************/ 435void GATT_ConfigServiceChangeCCC(const RawAddress& remote_bda, bool enable, 436 tBT_TRANSPORT transport) { 437 tGATT_PROFILE_CLCB* p_clcb = 438 gatt_profile_find_clcb_by_bd_addr(remote_bda, transport); 439 440 if (p_clcb == NULL) 441 p_clcb = gatt_profile_clcb_alloc(0, remote_bda, transport); 442 443 if (p_clcb == NULL) return; 444 445 if (GATT_GetConnIdIfConnected(gatt_cb.gatt_if, remote_bda, &p_clcb->conn_id, 446 transport)) { 447 p_clcb->connected = true; 448 } 449 /* hold the link here */ 450 GATT_Connect(gatt_cb.gatt_if, remote_bda, true, transport, true); 451 p_clcb->ccc_stage = GATT_SVC_CHANGED_CONNECTING; 452 453 if (!p_clcb->connected) { 454 /* wait for connection */ 455 return; 456 } 457 458 p_clcb->ccc_stage++; 459 gatt_cl_start_config_ccc(p_clcb); 460} 461