1/****************************************************************************** 2 * 3 * Copyright (C) 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 the main L2CAP entry points 22 * 23 ******************************************************************************/ 24 25#include "bt_target.h" 26#include <stdlib.h> 27#include <string.h> 28#include <stdio.h> 29 30#include "gki.h" 31#include "hcimsgs.h" 32#include "l2cdefs.h" 33#include "l2c_int.h" 34#include "l2c_api.h" 35#include "btu.h" 36#include "btm_int.h" 37 38/********************************************************************************/ 39/* L O C A L F U N C T I O N P R O T O T Y P E S */ 40/********************************************************************************/ 41static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len); 42 43/********************************************************************************/ 44/* G L O B A L L 2 C A P D A T A */ 45/********************************************************************************/ 46#if L2C_DYNAMIC_MEMORY == FALSE 47tL2C_CB l2cb; 48#endif 49 50/* Temporary - until l2cap implements group management */ 51#if (TCS_BCST_SETUP_INCLUDED == TRUE && TCS_INCLUDED == TRUE) 52extern void tcs_proc_bcst_msg( BD_ADDR addr, BT_HDR *p_msg ) ; 53#endif 54/******************************************************************************* 55** 56** Function l2c_bcst_msg 57** 58** Description 59** 60** Returns void 61** 62*******************************************************************************/ 63void l2c_bcst_msg( BT_HDR *p_buf, UINT16 psm ) 64{ 65 UINT8 *p; 66 67 /* Ensure we have enough space in the buffer for the L2CAP and HCI headers */ 68 if (p_buf->offset < L2CAP_BCST_MIN_OFFSET) 69 { 70 L2CAP_TRACE_ERROR ("L2CAP - cannot send buffer, offset: %d", p_buf->offset); 71 GKI_freebuf (p_buf); 72 return; 73 } 74 75 /* Step back some bytes to add the headers */ 76 p_buf->offset -= (HCI_DATA_PREAMBLE_SIZE + L2CAP_PKT_OVERHEAD + L2CAP_BCST_OVERHEAD); 77 p_buf->len += L2CAP_PKT_OVERHEAD + L2CAP_BCST_OVERHEAD; 78 79 /* Set the pointer to the beginning of the data */ 80 p = (UINT8 *)(p_buf + 1) + p_buf->offset; 81 82 /* First, the HCI transport header */ 83 UINT16_TO_STREAM (p, 0x0050 | (L2CAP_PKT_START << 12) | (2 << 14)); 84 85 /* The HCI transport will segment the buffers. */ 86 if (p_buf->len > btu_cb.hcit_acl_data_size) 87 { 88 UINT16_TO_STREAM (p, btu_cb.hcit_acl_data_size); 89 } 90 else 91 { 92 UINT16_TO_STREAM (p, p_buf->len); 93 } 94 95 /* Now the L2CAP header */ 96 UINT16_TO_STREAM (p, p_buf->len - L2CAP_PKT_OVERHEAD); 97 UINT16_TO_STREAM (p, L2CAP_CONNECTIONLESS_CID); 98 UINT16_TO_STREAM (p, psm); 99 100 p_buf->len += HCI_DATA_PREAMBLE_SIZE; 101 102 if (p_buf->len <= btu_cb.hcit_acl_pkt_size) 103 { 104 HCI_ACL_DATA_TO_LOWER (p_buf); 105 } 106} 107 108 109/******************************************************************************* 110** 111** Function l2c_rcv_acl_data 112** 113** Description This function is called from the HCI Interface when an ACL 114** data packet is received. 115** 116** Returns void 117** 118*******************************************************************************/ 119void l2c_rcv_acl_data (BT_HDR *p_msg) 120{ 121 UINT8 *p = (UINT8 *)(p_msg + 1) + p_msg->offset; 122 UINT16 handle, hci_len; 123 UINT8 pkt_type; 124 tL2C_LCB *p_lcb; 125 tL2C_CCB *p_ccb = NULL; 126 UINT16 l2cap_len, rcv_cid, psm; 127 128 /* Extract the handle */ 129 STREAM_TO_UINT16 (handle, p); 130 pkt_type = HCID_GET_EVENT (handle); 131 handle = HCID_GET_HANDLE (handle); 132 133 /* Since the HCI Transport is putting segmented packets back together, we */ 134 /* should never get a valid packet with the type set to "continuation" */ 135 if (pkt_type != L2CAP_PKT_CONTINUE) 136 { 137 /* Find the LCB based on the handle */ 138 if ((p_lcb = l2cu_find_lcb_by_handle (handle)) == NULL) 139 { 140 UINT8 cmd_code; 141 142 /* There is a slight possibility (specifically with USB) that we get an */ 143 /* L2CAP connection request before we get the HCI connection complete. */ 144 /* So for these types of messages, hold them for up to 2 seconds. */ 145 STREAM_TO_UINT16 (hci_len, p); 146 STREAM_TO_UINT16 (l2cap_len, p); 147 STREAM_TO_UINT16 (rcv_cid, p); 148 STREAM_TO_UINT8 (cmd_code, p); 149 150 if ((p_msg->layer_specific == 0) && (rcv_cid == L2CAP_SIGNALLING_CID) 151 && (cmd_code == L2CAP_CMD_INFO_REQ || cmd_code == L2CAP_CMD_CONN_REQ)) 152 { 153 L2CAP_TRACE_WARNING ("L2CAP - holding ACL for unknown handle:%d ls:%d cid:%d opcode:%d cur count:%d", 154 handle, p_msg->layer_specific, rcv_cid, cmd_code, 155 l2cb.rcv_hold_q.count); 156 p_msg->layer_specific = 2; 157 GKI_enqueue (&l2cb.rcv_hold_q, p_msg); 158 159 if (l2cb.rcv_hold_q.count == 1) 160 btu_start_timer (&l2cb.rcv_hold_tle, BTU_TTYPE_L2CAP_HOLD, BT_1SEC_TIMEOUT); 161 162 return; 163 } 164 else 165 { 166 L2CAP_TRACE_ERROR ("L2CAP - rcvd ACL for unknown handle:%d ls:%d cid:%d opcode:%d cur count:%d", 167 handle, p_msg->layer_specific, rcv_cid, cmd_code, l2cb.rcv_hold_q.count); 168 } 169 GKI_freebuf (p_msg); 170 return; 171 } 172 } 173 else 174 { 175 L2CAP_TRACE_WARNING ("L2CAP - expected pkt start or complete, got: %d", pkt_type); 176 GKI_freebuf (p_msg); 177 return; 178 } 179 180 /* Extract the length and update the buffer header */ 181 STREAM_TO_UINT16 (hci_len, p); 182 p_msg->offset += 4; 183 184#if (L2CAP_HOST_FLOW_CTRL == TRUE) 185 /* Send ack if we hit the threshold */ 186 if (++p_lcb->link_pkts_unacked >= p_lcb->link_ack_thresh) 187 btu_hcif_send_host_rdy_for_data(); 188#endif 189 190 /* Extract the length and CID */ 191 STREAM_TO_UINT16 (l2cap_len, p); 192 STREAM_TO_UINT16 (rcv_cid, p); 193 194 /* Find the CCB for this CID */ 195 if (rcv_cid >= L2CAP_BASE_APPL_CID) 196 { 197 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, rcv_cid)) == NULL) 198 { 199 L2CAP_TRACE_WARNING ("L2CAP - unknown CID: 0x%04x", rcv_cid); 200 GKI_freebuf (p_msg); 201 return; 202 } 203 } 204 205 if (hci_len >= L2CAP_PKT_OVERHEAD) /* Must receive at least the L2CAP length and CID.*/ 206 { 207 p_msg->len = hci_len - L2CAP_PKT_OVERHEAD; 208 p_msg->offset += L2CAP_PKT_OVERHEAD; 209 } 210 else 211 { 212 L2CAP_TRACE_WARNING ("L2CAP - got incorrect hci header" ); 213 GKI_freebuf (p_msg); 214 return; 215 } 216 217 if (l2cap_len != p_msg->len) 218 { 219 L2CAP_TRACE_WARNING ("L2CAP - bad length in pkt. Exp: %d Act: %d", 220 l2cap_len, p_msg->len); 221 222 GKI_freebuf (p_msg); 223 return; 224 } 225 226 /* Send the data through the channel state machine */ 227 if (rcv_cid == L2CAP_SIGNALLING_CID) 228 { 229 process_l2cap_cmd (p_lcb, p, l2cap_len); 230 GKI_freebuf (p_msg); 231 } 232 else if (rcv_cid == L2CAP_CONNECTIONLESS_CID) 233 { 234 /* process_connectionless_data (p_lcb); */ 235 STREAM_TO_UINT16 (psm, p); 236 L2CAP_TRACE_DEBUG( "GOT CONNECTIONLESS DATA PSM:%d", psm ) ; 237#if (TCS_BCST_SETUP_INCLUDED == TRUE && TCS_INCLUDED == TRUE) 238 if (psm == TCS_PSM_INTERCOM || psm == TCS_PSM_CORDLESS) 239 { 240 p_msg->offset += L2CAP_BCST_OVERHEAD; 241 p_msg->len -= L2CAP_BCST_OVERHEAD; 242 tcs_proc_bcst_msg( p_lcb->remote_bd_addr, p_msg ) ; 243 GKI_freebuf (p_msg); 244 } 245 else 246#endif 247 248#if (L2CAP_UCD_INCLUDED == TRUE) 249 /* if it is not broadcast, check UCD registration */ 250 if ( l2c_ucd_check_rx_pkts( p_lcb, p_msg ) ) 251 { 252 /* nothing to do */ 253 } 254 else 255#endif 256 GKI_freebuf (p_msg); 257 } 258#if (BLE_INCLUDED == TRUE) 259 else if (rcv_cid == L2CAP_BLE_SIGNALLING_CID) 260 { 261 l2cble_process_sig_cmd (p_lcb, p, l2cap_len); 262 GKI_freebuf (p_msg); 263 } 264#endif 265#if (L2CAP_NUM_FIXED_CHNLS > 0) 266 else if ((rcv_cid >= L2CAP_FIRST_FIXED_CHNL) && (rcv_cid <= L2CAP_LAST_FIXED_CHNL) && 267 (l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb != NULL) ) 268 { 269 /* If no CCB for this channel, allocate one */ 270 if (p_lcb && 271 /* discard fixed channel data when link is disconnecting */ 272 (p_lcb->link_state != LST_DISCONNECTING) && 273 l2cu_initialize_fixed_ccb (p_lcb, rcv_cid, 274 &l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts)) 275 { 276#if(defined BLE_INCLUDED && (BLE_INCLUDED == TRUE)) 277 l2cble_notify_le_connection(p_lcb->remote_bd_addr); 278#endif 279 p_ccb = p_lcb->p_fixed_ccbs[rcv_cid - L2CAP_FIRST_FIXED_CHNL]; 280 281 if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE) 282 l2c_fcr_proc_pdu (p_ccb, p_msg); 283 else 284 (*l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)(p_lcb->remote_bd_addr, p_msg); 285 } 286 else 287 GKI_freebuf (p_msg); 288 } 289#endif 290 291 else 292 { 293 if (p_ccb == NULL) 294 GKI_freebuf (p_msg); 295 else 296 { 297 /* Basic mode packets go straight to the state machine */ 298 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE) 299 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_msg); 300 else 301 { 302 /* eRTM or streaming mode, so we need to validate states first */ 303 if ((p_ccb->chnl_state == CST_OPEN) || (p_ccb->chnl_state == CST_CONFIG)) 304 l2c_fcr_proc_pdu (p_ccb, p_msg); 305 else 306 GKI_freebuf (p_msg); 307 } 308 } 309 } 310} 311 312/******************************************************************************* 313** 314** Function process_l2cap_cmd 315** 316** Description This function is called when a packet is received on the 317** L2CAP signalling CID 318** 319** Returns void 320** 321*******************************************************************************/ 322static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len) 323{ 324 UINT8 *p_pkt_end, *p_next_cmd, *p_cfg_end, *p_cfg_start; 325 UINT8 cmd_code, cfg_code, cfg_len, id; 326 tL2C_CONN_INFO con_info; 327 tL2CAP_CFG_INFO cfg_info; 328 UINT16 rej_reason, rej_mtu, lcid, rcid, info_type; 329 tL2C_CCB *p_ccb; 330 tL2C_RCB *p_rcb, *p_rcb2; 331 BOOLEAN cfg_rej, pkt_size_rej = FALSE; 332 UINT16 cfg_rej_len, cmd_len; 333 UINT16 result; 334 tL2C_CONN_INFO ci; 335 336#if (defined BLE_INCLUDED && BLE_INCLUDED == TRUE) 337 /* if l2cap command received in CID 1 on top of an LE link, ignore this command */ 338 if (p_lcb->transport == BT_TRANSPORT_LE) 339 return; 340#endif 341 342 /* Reject the packet if it exceeds the default Signalling Channel MTU */ 343 if (pkt_len > L2CAP_DEFAULT_MTU) 344 { 345 /* Core Spec requires a single response to the first command found in a multi-command 346 ** L2cap packet. If only responses in the packet, then it will be ignored. 347 ** Here we simply mark the bad packet and decide which cmd ID to reject later 348 */ 349 pkt_size_rej = TRUE; 350 L2CAP_TRACE_ERROR ("L2CAP SIG MTU Pkt Len Exceeded (672) -> pkt_len: %d", pkt_len); 351 } 352 353 p_next_cmd = p; 354 p_pkt_end = p + pkt_len; 355 356 memset (&cfg_info, 0, sizeof(cfg_info)); 357 358 /* An L2CAP packet may contain multiple commands */ 359 while (TRUE) 360 { 361 /* Smallest command is 4 bytes */ 362 if ((p = p_next_cmd) > (p_pkt_end - 4)) 363 break; 364 365 STREAM_TO_UINT8 (cmd_code, p); 366 STREAM_TO_UINT8 (id, p); 367 STREAM_TO_UINT16 (cmd_len, p); 368 369 /* Check command length does not exceed packet length */ 370 if ((p_next_cmd = p + cmd_len) > p_pkt_end) 371 { 372 L2CAP_TRACE_WARNING ("Command len bad pkt_len: %d cmd_len: %d code: %d", 373 pkt_len, cmd_len, cmd_code); 374 break; 375 } 376 377 L2CAP_TRACE_DEBUG ("cmd_code: %d, id:%d, cmd_len:%d", cmd_code, id, cmd_len); 378 379 /* Bad L2CAP packet length, look or cmd to reject */ 380 if (pkt_size_rej) 381 { 382 /* If command found rejected it and we're done, otherwise keep looking */ 383 if (l2c_is_cmd_rejected(cmd_code, id, p_lcb)) 384 return; 385 else 386 continue; /* Look for next cmd/response in current packet */ 387 } 388 389 switch (cmd_code) 390 { 391 case L2CAP_CMD_REJECT: 392 STREAM_TO_UINT16 (rej_reason, p); 393 if (rej_reason == L2CAP_CMD_REJ_MTU_EXCEEDED) 394 { 395 STREAM_TO_UINT16 (rej_mtu, p); 396 /* What to do with the MTU reject ? We have negotiated an MTU. For now */ 397 /* we will ignore it and let a higher protocol timeout take care of it */ 398 399 L2CAP_TRACE_WARNING ("L2CAP - MTU rej Handle: %d MTU: %d", p_lcb->handle, rej_mtu); 400 } 401 if (rej_reason == L2CAP_CMD_REJ_INVALID_CID) 402 { 403 STREAM_TO_UINT16 (rcid, p); 404 STREAM_TO_UINT16 (lcid, p); 405 406 L2CAP_TRACE_WARNING ("L2CAP - rej with CID invalid, LCID: 0x%04x RCID: 0x%04x", lcid, rcid); 407 408 /* Remote CID invalid. Treat as a disconnect */ 409 if (((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL) 410 && (p_ccb->remote_cid == rcid)) 411 { 412 /* Fake link disconnect - no reply is generated */ 413 l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL); 414 } 415 } 416 417 /* SonyEricsson Info request Bug workaround (Continue connection) */ 418 else if (rej_reason == L2CAP_CMD_REJ_NOT_UNDERSTOOD && p_lcb->w4_info_rsp) 419 { 420 btu_stop_timer (&p_lcb->info_timer_entry); 421 422 p_lcb->w4_info_rsp = FALSE; 423 ci.status = HCI_SUCCESS; 424 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR)); 425 426 /* For all channels, send the event through their FSMs */ 427 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb) 428 { 429 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci); 430 } 431 } 432 break; 433 434 case L2CAP_CMD_CONN_REQ: 435 STREAM_TO_UINT16 (con_info.psm, p); 436 STREAM_TO_UINT16 (rcid, p); 437 if ((p_rcb = l2cu_find_rcb_by_psm (con_info.psm)) == NULL) 438 { 439 L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for unknown PSM: %d", con_info.psm); 440 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM); 441 break; 442 } 443 else 444 { 445 if (!p_rcb->api.pL2CA_ConnectInd_Cb) 446 { 447 L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for outgoing-only connection PSM: %d", con_info.psm); 448 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM); 449 break; 450 } 451 } 452 if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL) 453 { 454 L2CAP_TRACE_ERROR ("L2CAP - unable to allocate CCB"); 455 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_RESOURCES); 456 break; 457 } 458 p_ccb->remote_id = id; 459 p_ccb->p_rcb = p_rcb; 460 p_ccb->remote_cid = rcid; 461 462 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_REQ, &con_info); 463 break; 464 465 case L2CAP_CMD_CONN_RSP: 466 STREAM_TO_UINT16 (con_info.remote_cid, p); 467 STREAM_TO_UINT16 (lcid, p); 468 STREAM_TO_UINT16 (con_info.l2cap_result, p); 469 STREAM_TO_UINT16 (con_info.l2cap_status, p); 470 471 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) == NULL) 472 { 473 L2CAP_TRACE_WARNING ("L2CAP - no CCB for conn rsp, LCID: %d RCID: %d", 474 lcid, con_info.remote_cid); 475 break; 476 } 477 if (p_ccb->local_id != id) 478 { 479 L2CAP_TRACE_WARNING ("L2CAP - con rsp - bad ID. Exp: %d Got: %d", 480 p_ccb->local_id, id); 481 break; 482 } 483 484 if (con_info.l2cap_result == L2CAP_CONN_OK) 485 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP, &con_info); 486 else if (con_info.l2cap_result == L2CAP_CONN_PENDING) 487 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_PND, &con_info); 488 else 489 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info); 490 491 break; 492 493 case L2CAP_CMD_CONFIG_REQ: 494 p_cfg_end = p + cmd_len; 495 cfg_rej = FALSE; 496 cfg_rej_len = 0; 497 498 STREAM_TO_UINT16 (lcid, p); 499 STREAM_TO_UINT16 (cfg_info.flags, p); 500 501 p_cfg_start = p; 502 503 cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present = 504 cfg_info.fcr_present = cfg_info.fcs_present = FALSE; 505 506 while (p < p_cfg_end) 507 { 508 STREAM_TO_UINT8 (cfg_code, p); 509 STREAM_TO_UINT8 (cfg_len, p); 510 511 switch (cfg_code & 0x7F) 512 { 513 case L2CAP_CFG_TYPE_MTU: 514 cfg_info.mtu_present = TRUE; 515 STREAM_TO_UINT16 (cfg_info.mtu, p); 516 break; 517 518 case L2CAP_CFG_TYPE_FLUSH_TOUT: 519 cfg_info.flush_to_present = TRUE; 520 STREAM_TO_UINT16 (cfg_info.flush_to, p); 521 break; 522 523 case L2CAP_CFG_TYPE_QOS: 524 cfg_info.qos_present = TRUE; 525 STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p); 526 STREAM_TO_UINT8 (cfg_info.qos.service_type, p); 527 STREAM_TO_UINT32 (cfg_info.qos.token_rate, p); 528 STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p); 529 STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p); 530 STREAM_TO_UINT32 (cfg_info.qos.latency, p); 531 STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p); 532 break; 533 534 case L2CAP_CFG_TYPE_FCR: 535 cfg_info.fcr_present = TRUE; 536 STREAM_TO_UINT8 (cfg_info.fcr.mode, p); 537 STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p); 538 STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p); 539 STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p); 540 STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p); 541 STREAM_TO_UINT16 (cfg_info.fcr.mps, p); 542 break; 543 544 case L2CAP_CFG_TYPE_FCS: 545 cfg_info.fcs_present = TRUE; 546 STREAM_TO_UINT8 (cfg_info.fcs, p); 547 break; 548 549 case L2CAP_CFG_TYPE_EXT_FLOW: 550 cfg_info.ext_flow_spec_present = TRUE; 551 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p); 552 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p); 553 STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p); 554 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p); 555 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p); 556 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p); 557 break; 558 559 default: 560 /* sanity check option length */ 561 if ((cfg_len + L2CAP_CFG_OPTION_OVERHEAD) <= cmd_len) 562 { 563 p += cfg_len; 564 if ((cfg_code & 0x80) == 0) 565 { 566 cfg_rej_len += cfg_len + L2CAP_CFG_OPTION_OVERHEAD; 567 cfg_rej = TRUE; 568 } 569 } 570 /* bad length; force loop exit */ 571 else 572 { 573 p = p_cfg_end; 574 cfg_rej = TRUE; 575 } 576 break; 577 } 578 } 579 580 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL) 581 { 582 p_ccb->remote_id = id; 583 if (cfg_rej) 584 { 585 l2cu_send_peer_config_rej (p_ccb, p_cfg_start, (UINT16) (cmd_len - L2CAP_CONFIG_REQ_LEN), cfg_rej_len); 586 } 587 else 588 { 589 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_REQ, &cfg_info); 590 } 591 } 592 else 593 { 594 /* updated spec says send command reject on invalid cid */ 595 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_INVALID_CID, id, 0, 0); 596 } 597 break; 598 599 case L2CAP_CMD_CONFIG_RSP: 600 p_cfg_end = p + cmd_len; 601 STREAM_TO_UINT16 (lcid, p); 602 STREAM_TO_UINT16 (cfg_info.flags, p); 603 STREAM_TO_UINT16 (cfg_info.result, p); 604 605 cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present = 606 cfg_info.fcr_present = cfg_info.fcs_present = FALSE; 607 608 while (p < p_cfg_end) 609 { 610 STREAM_TO_UINT8 (cfg_code, p); 611 STREAM_TO_UINT8 (cfg_len, p); 612 613 switch (cfg_code & 0x7F) 614 { 615 case L2CAP_CFG_TYPE_MTU: 616 cfg_info.mtu_present = TRUE; 617 STREAM_TO_UINT16 (cfg_info.mtu, p); 618 break; 619 620 case L2CAP_CFG_TYPE_FLUSH_TOUT: 621 cfg_info.flush_to_present = TRUE; 622 STREAM_TO_UINT16 (cfg_info.flush_to, p); 623 break; 624 625 case L2CAP_CFG_TYPE_QOS: 626 cfg_info.qos_present = TRUE; 627 STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p); 628 STREAM_TO_UINT8 (cfg_info.qos.service_type, p); 629 STREAM_TO_UINT32 (cfg_info.qos.token_rate, p); 630 STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p); 631 STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p); 632 STREAM_TO_UINT32 (cfg_info.qos.latency, p); 633 STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p); 634 break; 635 636 case L2CAP_CFG_TYPE_FCR: 637 cfg_info.fcr_present = TRUE; 638 STREAM_TO_UINT8 (cfg_info.fcr.mode, p); 639 STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p); 640 STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p); 641 STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p); 642 STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p); 643 STREAM_TO_UINT16 (cfg_info.fcr.mps, p); 644 break; 645 646 case L2CAP_CFG_TYPE_FCS: 647 cfg_info.fcs_present = TRUE; 648 STREAM_TO_UINT8 (cfg_info.fcs, p); 649 break; 650 651 case L2CAP_CFG_TYPE_EXT_FLOW: 652 cfg_info.ext_flow_spec_present = TRUE; 653 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p); 654 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p); 655 STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p); 656 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p); 657 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p); 658 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p); 659 break; 660 } 661 } 662 663 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL) 664 { 665 if (p_ccb->local_id != id) 666 { 667 L2CAP_TRACE_WARNING ("L2CAP - cfg rsp - bad ID. Exp: %d Got: %d", 668 p_ccb->local_id, id); 669 break; 670 } 671 if ( (cfg_info.result == L2CAP_CFG_OK) || (cfg_info.result == L2CAP_CFG_PENDING) ) 672 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP, &cfg_info); 673 else 674 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP_NEG, &cfg_info); 675 } 676 else 677 { 678 L2CAP_TRACE_WARNING ("L2CAP - rcvd cfg rsp for unknown CID: 0x%04x", lcid); 679 } 680 break; 681 682 683 case L2CAP_CMD_DISC_REQ: 684 STREAM_TO_UINT16 (lcid, p); 685 STREAM_TO_UINT16 (rcid, p); 686 687 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL) 688 { 689 if (p_ccb->remote_cid == rcid) 690 { 691 p_ccb->remote_id = id; 692 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_REQ, &con_info); 693 } 694 } 695 else 696 l2cu_send_peer_disc_rsp (p_lcb, id, lcid, rcid); 697 698 break; 699 700 case L2CAP_CMD_DISC_RSP: 701 STREAM_TO_UINT16 (rcid, p); 702 STREAM_TO_UINT16 (lcid, p); 703 704 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL) 705 { 706 if ((p_ccb->remote_cid == rcid) && (p_ccb->local_id == id)) 707 { 708 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_RSP, &con_info); 709 } 710 } 711 break; 712 713 case L2CAP_CMD_ECHO_REQ: 714 l2cu_send_peer_echo_rsp (p_lcb, id, NULL, 0); 715 break; 716 717 case L2CAP_CMD_ECHO_RSP: 718 if (p_lcb->p_echo_rsp_cb) 719 { 720 tL2CA_ECHO_RSP_CB *p_cb = p_lcb->p_echo_rsp_cb; 721 722 /* Zero out the callback in case app immediately calls us again */ 723 p_lcb->p_echo_rsp_cb = NULL; 724 725 (*p_cb) (L2CAP_PING_RESULT_OK); 726 } 727 break; 728 729 case L2CAP_CMD_INFO_REQ: 730 STREAM_TO_UINT16 (info_type, p); 731 l2cu_send_peer_info_rsp (p_lcb, id, info_type); 732 break; 733 734 case L2CAP_CMD_INFO_RSP: 735 /* Stop the link connect timer if sent before L2CAP connection is up */ 736 if (p_lcb->w4_info_rsp) 737 { 738 btu_stop_timer (&p_lcb->info_timer_entry); 739 p_lcb->w4_info_rsp = FALSE; 740 } 741 742 STREAM_TO_UINT16 (info_type, p); 743 STREAM_TO_UINT16 (result, p); 744 745 p_lcb->info_rx_bits |= (1 << info_type); 746 747 if ( (info_type == L2CAP_EXTENDED_FEATURES_INFO_TYPE) 748 && (result == L2CAP_INFO_RESP_RESULT_SUCCESS) ) 749 { 750 STREAM_TO_UINT32( p_lcb->peer_ext_fea, p ); 751 752#if (L2CAP_NUM_FIXED_CHNLS > 0) 753 if (p_lcb->peer_ext_fea & L2CAP_EXTFEA_FIXED_CHNLS) 754 { 755 l2cu_send_peer_info_req (p_lcb, L2CAP_FIXED_CHANNELS_INFO_TYPE); 756 break; 757 } 758 else 759 { 760 l2cu_process_fixed_chnl_resp (p_lcb); 761 } 762#endif 763 } 764 765 766#if (L2CAP_NUM_FIXED_CHNLS > 0) 767 if (info_type == L2CAP_FIXED_CHANNELS_INFO_TYPE) 768 { 769 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS) 770 { 771 memcpy (p_lcb->peer_chnl_mask, p, L2CAP_FIXED_CHNL_ARRAY_SIZE); 772 } 773 774 l2cu_process_fixed_chnl_resp (p_lcb); 775 } 776#endif 777#if (L2CAP_UCD_INCLUDED == TRUE) 778 else if (info_type == L2CAP_CONNLESS_MTU_INFO_TYPE) 779 { 780 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS) 781 { 782 STREAM_TO_UINT16 (p_lcb->ucd_mtu, p); 783 } 784 } 785#endif 786 787 ci.status = HCI_SUCCESS; 788 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR)); 789 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb) 790 { 791 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci); 792 } 793 break; 794 795 default: 796 L2CAP_TRACE_WARNING ("L2CAP - bad cmd code: %d", cmd_code); 797 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0, 0); 798 return; 799 } 800 } 801} 802 803/******************************************************************************* 804** 805** Function l2c_process_held_packets 806** 807** Description This function processes any L2CAP packets that arrived before 808** the HCI connection complete arrived. It is a work around for 809** badly behaved controllers. 810** 811** Returns void 812** 813*******************************************************************************/ 814void l2c_process_held_packets (BOOLEAN timed_out) 815{ 816 BT_HDR *p_buf, *p_buf1; 817 BUFFER_Q *p_rcv_hold_q = &l2cb.rcv_hold_q; 818 819 if (!p_rcv_hold_q->count) 820 return; 821 822 if (!timed_out) 823 { 824 btu_stop_timer(&l2cb.rcv_hold_tle); 825 L2CAP_TRACE_WARNING("L2CAP HOLD CONTINUE"); 826 } 827 else 828 { 829 L2CAP_TRACE_WARNING("L2CAP HOLD TIMEOUT"); 830 } 831 832 /* Update the timeouts in the hold queue */ 833 for (p_buf = (BT_HDR *)GKI_getfirst (p_rcv_hold_q); p_buf; p_buf = p_buf1) 834 { 835 p_buf1 = (BT_HDR *)GKI_getnext (p_buf); 836 if (!timed_out || (!p_buf->layer_specific) || (--p_buf->layer_specific == 0)) 837 { 838 GKI_remove_from_queue (p_rcv_hold_q, p_buf); 839 p_buf->layer_specific = 0xFFFF; 840 l2c_rcv_acl_data (p_buf); 841 } 842 } 843 844 /* If anyone still in the queue, restart the timeout */ 845 if (p_rcv_hold_q->count) 846 btu_start_timer (&l2cb.rcv_hold_tle, BTU_TTYPE_L2CAP_HOLD, BT_1SEC_TIMEOUT); 847} 848 849 850/******************************************************************************* 851** 852** Function l2c_init 853** 854** Description This function is called once at startup to initialize 855** all the L2CAP structures 856** 857** Returns void 858** 859*******************************************************************************/ 860void l2c_init (void) 861{ 862 INT16 xx; 863 864 memset (&l2cb, 0, sizeof (tL2C_CB)); 865 /* the psm is increased by 2 before being used */ 866 l2cb.dyn_psm = 0xFFF; 867 868 /* Put all the channel control blocks on the free queue */ 869 for (xx = 0; xx < MAX_L2CAP_CHANNELS - 1; xx++) 870 { 871 l2cb.ccb_pool[xx].p_next_ccb = &l2cb.ccb_pool[xx + 1]; 872 } 873 874#if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE) 875 /* it will be set to L2CAP_PKT_START_NON_FLUSHABLE if controller supports */ 876 l2cb.non_flushable_pbf = L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT; 877#endif 878 879 880 l2cb.p_free_ccb_first = &l2cb.ccb_pool[0]; 881 l2cb.p_free_ccb_last = &l2cb.ccb_pool[MAX_L2CAP_CHANNELS - 1]; 882 883#ifdef L2CAP_DESIRED_LINK_ROLE 884 l2cb.desire_role = L2CAP_DESIRED_LINK_ROLE; 885#else 886 l2cb.desire_role = HCI_ROLE_SLAVE; 887#endif 888 889 /* Set the default idle timeout */ 890 l2cb.idle_timeout = L2CAP_LINK_INACTIVITY_TOUT; 891 892#if defined(L2CAP_INITIAL_TRACE_LEVEL) 893 l2cb.l2cap_trace_level = L2CAP_INITIAL_TRACE_LEVEL; 894#else 895 l2cb.l2cap_trace_level = BT_TRACE_LEVEL_NONE; /* No traces */ 896#endif 897 898#if L2CAP_CONFORMANCE_TESTING == TRUE 899 /* Conformance testing needs a dynamic response */ 900 l2cb.test_info_resp = L2CAP_EXTFEA_SUPPORTED_MASK; 901#endif 902 903 /* Number of ACL buffers to use for high priority channel */ 904#if (defined(L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE) && (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE)) 905 l2cb.high_pri_min_xmit_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA; 906#endif 907 908} 909 910/******************************************************************************* 911** 912** Function l2c_process_timeout 913** 914** Description This function is called when an L2CAP-related timeout occurs 915** 916** Returns void 917** 918*******************************************************************************/ 919void l2c_process_timeout (TIMER_LIST_ENT *p_tle) 920{ 921 /* What type of timeout ? */ 922 switch (p_tle->event) 923 { 924 case BTU_TTYPE_L2CAP_LINK: 925 l2c_link_timeout ((tL2C_LCB *)p_tle->param); 926 break; 927 928 case BTU_TTYPE_L2CAP_CHNL: 929 l2c_csm_execute (((tL2C_CCB *)p_tle->param), L2CEVT_TIMEOUT, NULL); 930 break; 931 932 case BTU_TTYPE_L2CAP_FCR_ACK: 933 l2c_csm_execute (((tL2C_CCB *)p_tle->param), L2CEVT_ACK_TIMEOUT, NULL); 934 break; 935 936 case BTU_TTYPE_L2CAP_HOLD: 937 /* Update the timeouts in the hold queue */ 938 l2c_process_held_packets(TRUE); 939 break; 940 941 case BTU_TTYPE_L2CAP_INFO: 942 l2c_info_timeout((tL2C_LCB *)p_tle->param); 943 break; 944 } 945} 946 947/******************************************************************************* 948** 949** Function l2c_data_write 950** 951** Description API functions call this function to write data. 952** 953** Returns L2CAP_DW_SUCCESS, if data accepted, else FALSE 954** L2CAP_DW_CONGESTED, if data accepted and the channel is congested 955** L2CAP_DW_FAILED, if error 956** 957*******************************************************************************/ 958UINT8 l2c_data_write (UINT16 cid, BT_HDR *p_data, UINT16 flags) 959{ 960 tL2C_CCB *p_ccb; 961 962 /* Find the channel control block. We don't know the link it is on. */ 963 if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) 964 { 965 L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_DataWrite, CID: %d", cid); 966 GKI_freebuf (p_data); 967 return (L2CAP_DW_FAILED); 968 } 969 970#ifndef TESTER /* Tester may send any amount of data. otherwise sending message 971 bigger than mtu size of peer is a violation of protocol */ 972 if (p_data->len > p_ccb->peer_cfg.mtu) 973 { 974 L2CAP_TRACE_WARNING ("L2CAP - CID: 0x%04x cannot send message bigger than peer's mtu size", cid); 975 GKI_freebuf (p_data); 976 return (L2CAP_DW_FAILED); 977 } 978#endif 979 980 /* channel based, packet based flushable or non-flushable */ 981 p_data->layer_specific = flags; 982 983 /* If already congested, do not accept any more packets */ 984 if (p_ccb->cong_sent) 985 { 986 L2CAP_TRACE_ERROR ("L2CAP - CID: 0x%04x cannot send, already congested xmit_hold_q.count: %u buff_quota: %u", 987 p_ccb->local_cid, p_ccb->xmit_hold_q.count, p_ccb->buff_quota); 988 989 GKI_freebuf (p_data); 990 return (L2CAP_DW_FAILED); 991 } 992 993 l2c_csm_execute (p_ccb, L2CEVT_L2CA_DATA_WRITE, p_data); 994 995 if (p_ccb->cong_sent) 996 return (L2CAP_DW_CONGESTED); 997 998 return (L2CAP_DW_SUCCESS); 999} 1000 1001