stack/l2cap/l2c_main.c

   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 #define LOG_TAG "bt_l2c_main"
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include <log/log.h>
  32
  33 #include "bt_target.h"
  34 #include "btm_int.h"
  35 #include "btu.h"
  36 #include "device/include/controller.h"
  37 #include "bt_common.h"
  38 #include "hcimsgs.h"
  39 #include "l2c_api.h"
  40 #include "l2c_int.h"
  41 #include "l2cdefs.h"
  42 #include "osi/include/log.h"
  43
  44
  45 extern fixed_queue_t *btu_general_alarm_queue;
  46
  47 /********************************************************************************/
  48 /*              L O C A L    F U N C T I O N     P R O T O T Y P E S            */
  49 /********************************************************************************/
  50 static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len);
  51
  52 /********************************************************************************/
  53 /*                 G L O B A L      L 2 C A P       D A T A                     */
  54 /********************************************************************************/
  55 #if L2C_DYNAMIC_MEMORY == FALSE
  56 tL2C_CB l2cb;
  57 #endif
  58
  59 /*******************************************************************************
  60 **
  61 ** Function         l2c_rcv_acl_data
  62 **
  63 ** Description      This function is called from the HCI Interface when an ACL
  64 **                  data packet is received.
  65 **
  66 ** Returns          void
  67 **
  68 *******************************************************************************/
  69 void l2c_rcv_acl_data (BT_HDR *p_msg)
  70 {
  71     UINT8       *p = (UINT8 *)(p_msg + 1) + p_msg->offset;
  72     UINT16      handle, hci_len;
  73     UINT8       pkt_type;
  74     tL2C_LCB    *p_lcb;
  75     tL2C_CCB    *p_ccb = NULL;
  76     UINT16      l2cap_len, rcv_cid, psm;
  77     UINT16      credit;
  78
  79     /* Extract the handle */
  80     STREAM_TO_UINT16 (handle, p);
  81     pkt_type = HCID_GET_EVENT (handle);
  82     handle   = HCID_GET_HANDLE (handle);
  83
  84     /* Since the HCI Transport is putting segmented packets back together, we */
  85     /* should never get a valid packet with the type set to "continuation"    */
  86     if (pkt_type != L2CAP_PKT_CONTINUE)
  87     {
  88         /* Find the LCB based on the handle */
  89         if ((p_lcb = l2cu_find_lcb_by_handle (handle)) == NULL)
  90         {
  91             UINT8       cmd_code;
  92
  93             /* There is a slight possibility (specifically with USB) that we get an */
  94             /* L2CAP connection request before we get the HCI connection complete.  */
  95             /* So for these types of messages, hold them for up to 2 seconds.       */
  96             STREAM_TO_UINT16 (hci_len, p);
  97             STREAM_TO_UINT16 (l2cap_len, p);
  98             STREAM_TO_UINT16 (rcv_cid, p);
  99             STREAM_TO_UINT8  (cmd_code, p);
 100
 101             if ((p_msg->layer_specific == 0) && (rcv_cid == L2CAP_SIGNALLING_CID)
 102                     && (cmd_code == L2CAP_CMD_INFO_REQ || cmd_code == L2CAP_CMD_CONN_REQ)) {
 103                 L2CAP_TRACE_WARNING ("L2CAP - holding ACL for unknown handle:%d ls:%d"
 104                         "  cid:%d opcode:%d cur count:%d", handle, p_msg->layer_specific,
 105                         rcv_cid, cmd_code, list_length(l2cb.rcv_pending_q));
 106                 p_msg->layer_specific = 2;
 107                 list_append(l2cb.rcv_pending_q, p_msg);
 108
 109                 if (list_length(l2cb.rcv_pending_q) == 1) {
 110                     alarm_set_on_queue(l2cb.receive_hold_timer,
 111                                        BT_1SEC_TIMEOUT_MS,
 112                                        l2c_receive_hold_timer_timeout, NULL,
 113                                        btu_general_alarm_queue);
 114                 }
 115
 116                 return;
 117             } else {
 118                 L2CAP_TRACE_ERROR ("L2CAP - rcvd ACL for unknown handle:%d ls:%d cid:%d"
 119                         " opcode:%d cur count:%d", handle, p_msg->layer_specific, rcv_cid,
 120                         cmd_code, list_length(l2cb.rcv_pending_q));
 121             }
 122             osi_free(p_msg);
 123             return;
 124         }
 125     }
 126     else
 127     {
 128         L2CAP_TRACE_WARNING ("L2CAP - expected pkt start or complete, got: %d", pkt_type);
 129         osi_free(p_msg);
 130         return;
 131     }
 132
 133     /* Extract the length and update the buffer header */
 134     STREAM_TO_UINT16 (hci_len, p);
 135     p_msg->offset += 4;
 136
 137     if (hci_len < L2CAP_PKT_OVERHEAD) {
 138         /* Must receive at least the L2CAP length and CID */
 139         L2CAP_TRACE_WARNING ("L2CAP - got incorrect hci header");
 140         android_errorWriteLog(0x534e4554, "34946955");
 141         osi_free(p_msg);
 142         return;
 143     }
 144
 145     /* Extract the length and CID */
 146     STREAM_TO_UINT16 (l2cap_len, p);
 147     STREAM_TO_UINT16 (rcv_cid, p);
 148
 149 #if BLE_INCLUDED == TRUE
 150    /* for BLE channel, always notify connection when ACL data received on the link */
 151    if (p_lcb && p_lcb->transport == BT_TRANSPORT_LE && p_lcb->link_state != LST_DISCONNECTING)
 152       /* only process fixed channel data as channel open indication when link is not in disconnecting mode */
 153         l2cble_notify_le_connection(p_lcb->remote_bd_addr);
 154 #endif
 155
 156     /* Find the CCB for this CID */
 157     if (rcv_cid >= L2CAP_BASE_APPL_CID)
 158     {
 159         if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, rcv_cid)) == NULL)
 160         {
 161             L2CAP_TRACE_WARNING ("L2CAP - unknown CID: 0x%04x", rcv_cid);
 162             osi_free(p_msg);
 163             return;
 164         }
 165     }
 166
 167     p_msg->len    = hci_len - L2CAP_PKT_OVERHEAD;
 168     p_msg->offset += L2CAP_PKT_OVERHEAD;
 169
 170     if (l2cap_len != p_msg->len)
 171     {
 172         L2CAP_TRACE_WARNING ("L2CAP - bad length in pkt. Exp: %d  Act: %d",
 173                               l2cap_len, p_msg->len);
 174
 175         osi_free(p_msg);
 176         return;
 177     }
 178
 179     /* Send the data through the channel state machine */
 180     if (rcv_cid == L2CAP_SIGNALLING_CID)
 181     {
 182         process_l2cap_cmd (p_lcb, p, l2cap_len);
 183         osi_free(p_msg);
 184     }
 185     else if (rcv_cid == L2CAP_CONNECTIONLESS_CID)
 186     {
 187         /* process_connectionless_data (p_lcb); */
 188         STREAM_TO_UINT16 (psm, p);
 189         L2CAP_TRACE_DEBUG( "GOT CONNECTIONLESS DATA PSM:%d", psm ) ;
 190
 191 #if (L2CAP_UCD_INCLUDED == TRUE)
 192         /* if it is not broadcast, check UCD registration */
 193         if ( l2c_ucd_check_rx_pkts( p_lcb, p_msg ) )
 194         {
 195             /* nothing to do */
 196         }
 197         else
 198 #endif
 199             osi_free(p_msg);
 200     }
 201 #if (BLE_INCLUDED == TRUE)
 202     else if (rcv_cid == L2CAP_BLE_SIGNALLING_CID)
 203     {
 204         l2cble_process_sig_cmd (p_lcb, p, l2cap_len);
 205         osi_free(p_msg);
 206     }
 207 #endif
 208 #if (L2CAP_NUM_FIXED_CHNLS > 0)
 209     else if ((rcv_cid >= L2CAP_FIRST_FIXED_CHNL) && (rcv_cid <= L2CAP_LAST_FIXED_CHNL) &&
 210              (l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb != NULL) )
 211     {
 212         /* If no CCB for this channel, allocate one */
 213         if (p_lcb &&
 214             /* only process fixed channel data when link is open or wait for data indication */
 215             (p_lcb->link_state != LST_DISCONNECTING) &&
 216             l2cu_initialize_fixed_ccb (p_lcb, rcv_cid, &l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts))
 217         {
 218             p_ccb = p_lcb->p_fixed_ccbs[rcv_cid - L2CAP_FIRST_FIXED_CHNL];
 219
 220             if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE)
 221                 l2c_fcr_proc_pdu (p_ccb, p_msg);
 222             else
 223                 (*l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)
 224                     (rcv_cid, p_lcb->remote_bd_addr, p_msg);
 225         }
 226         else
 227             osi_free(p_msg);
 228     }
 229 #endif
 230
 231     else
 232     {
 233         if (p_ccb == NULL)
 234             osi_free(p_msg);
 235         else
 236         {
 237             if (p_lcb->transport == BT_TRANSPORT_LE)
 238             {
 239                l2c_lcc_proc_pdu(p_ccb,p_msg);
 240                // Got a pkt, valid send out credits to the peer device
 241                credit = L2CAP_LE_DEFAULT_CREDIT;
 242                l2c_csm_execute(p_ccb, L2CEVT_L2CA_SEND_FLOW_CONTROL_CREDIT, &credit);
 243             }
 244             else
 245             {
 246                 /* Basic mode packets go straight to the state machine */
 247                 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE)
 248                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_msg);
 249                 else
 250                 {
 251                     /* eRTM or streaming mode, so we need to validate states first */
 252                     if ((p_ccb->chnl_state == CST_OPEN) || (p_ccb->chnl_state == CST_CONFIG))
 253                         l2c_fcr_proc_pdu (p_ccb, p_msg);
 254                     else
 255                         osi_free (p_msg);
 256                 }
 257             }
 258         }
 259     }
 260 }
 261
 262 /*******************************************************************************
 263 **
 264 ** Function         process_l2cap_cmd
 265 **
 266 ** Description      This function is called when a packet is received on the
 267 **                  L2CAP signalling CID
 268 **
 269 ** Returns          void
 270 **
 271 *******************************************************************************/
 272 static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len)
 273 {
 274     UINT8           *p_pkt_end, *p_next_cmd, *p_cfg_end, *p_cfg_start;
 275     UINT8           cmd_code, cfg_code, cfg_len, id;
 276     tL2C_CONN_INFO  con_info;
 277     tL2CAP_CFG_INFO cfg_info;
 278     UINT16          rej_reason, rej_mtu, lcid, rcid, info_type;
 279     tL2C_CCB        *p_ccb;
 280     tL2C_RCB        *p_rcb;
 281     BOOLEAN         cfg_rej, pkt_size_rej = FALSE;
 282     UINT16          cfg_rej_len, cmd_len;
 283     UINT16          result;
 284     tL2C_CONN_INFO  ci;
 285
 286 #if (defined BLE_INCLUDED && BLE_INCLUDED == TRUE)
 287     /* if l2cap command received in CID 1 on top of an LE link, ignore this command */
 288     if (p_lcb->transport == BT_TRANSPORT_LE)
 289         return;
 290 #endif
 291
 292     /* Reject the packet if it exceeds the default Signalling Channel MTU */
 293     if (pkt_len > L2CAP_DEFAULT_MTU)
 294     {
 295         /* Core Spec requires a single response to the first command found in a multi-command
 296         ** L2cap packet.  If only responses in the packet, then it will be ignored.
 297         ** Here we simply mark the bad packet and decide which cmd ID to reject later
 298         */
 299         pkt_size_rej = TRUE;
 300         L2CAP_TRACE_ERROR ("L2CAP SIG MTU Pkt Len Exceeded (672) -> pkt_len: %d", pkt_len);
 301     }
 302
 303     p_next_cmd = p;
 304     p_pkt_end  = p + pkt_len;
 305
 306     memset (&cfg_info, 0, sizeof(cfg_info));
 307
 308     /* An L2CAP packet may contain multiple commands */
 309     while (TRUE)
 310     {
 311         /* Smallest command is 4 bytes */
 312         if ((p = p_next_cmd) > (p_pkt_end - 4))
 313             break;
 314
 315         STREAM_TO_UINT8  (cmd_code, p);
 316         STREAM_TO_UINT8  (id, p);
 317         STREAM_TO_UINT16 (cmd_len, p);
 318
 319         /* Check command length does not exceed packet length */
 320         if ((p_next_cmd = p + cmd_len) > p_pkt_end)
 321         {
 322             L2CAP_TRACE_WARNING ("Command len bad  pkt_len: %d  cmd_len: %d  code: %d",
 323                                   pkt_len, cmd_len, cmd_code);
 324             break;
 325         }
 326
 327         L2CAP_TRACE_DEBUG ("cmd_code: %d, id:%d, cmd_len:%d", cmd_code, id, cmd_len);
 328
 329         /* Bad L2CAP packet length, look or cmd to reject */
 330         if (pkt_size_rej)
 331         {
 332             /* If command found rejected it and we're done, otherwise keep looking */
 333             if (l2c_is_cmd_rejected(cmd_code, id, p_lcb))
 334                 return;
 335             else
 336                 continue; /* Look for next cmd/response in current packet */
 337         }
 338
 339         switch (cmd_code)
 340         {
 341         case L2CAP_CMD_REJECT:
 342             if (p + 2 > p_next_cmd) {
 343                 android_errorWriteLog(0x534e4554, "74202041");
 344                 return;
 345             }
 346             STREAM_TO_UINT16 (rej_reason, p);
 347             if (rej_reason == L2CAP_CMD_REJ_MTU_EXCEEDED)
 348             {
 349                 if (p + 2 > p_next_cmd) {
 350                     android_errorWriteLog(0x534e4554, "74202041");
 351                     return;
 352                 }
 353                 STREAM_TO_UINT16 (rej_mtu, p);
 354                 /* What to do with the MTU reject ? We have negotiated an MTU. For now */
 355                 /* we will ignore it and let a higher protocol timeout take care of it */
 356
 357                 L2CAP_TRACE_WARNING ("L2CAP - MTU rej Handle: %d MTU: %d", p_lcb->handle, rej_mtu);
 358             }
 359             if (rej_reason == L2CAP_CMD_REJ_INVALID_CID)
 360             {
 361                 if (p + 4 > p_next_cmd) {
 362                     android_errorWriteLog(0x534e4554, "74202041");
 363                     return;
 364                 }
 365                 STREAM_TO_UINT16 (rcid, p);
 366                 STREAM_TO_UINT16 (lcid, p);
 367
 368                 L2CAP_TRACE_WARNING ("L2CAP - rej with CID invalid, LCID: 0x%04x RCID: 0x%04x", lcid, rcid);
 369
 370                 /* Remote CID invalid. Treat as a disconnect */
 371                 if (((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 372                  && (p_ccb->remote_cid == rcid))
 373                 {
 374                     /* Fake link disconnect - no reply is generated */
 375                     l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
 376                 }
 377             }
 378
 379             /* SonyEricsson Info request Bug workaround (Continue connection) */
 380             else if (rej_reason == L2CAP_CMD_REJ_NOT_UNDERSTOOD && p_lcb->w4_info_rsp)
 381             {
 382                 alarm_cancel(p_lcb->info_resp_timer);
 383
 384                 p_lcb->w4_info_rsp = FALSE;
 385                 ci.status = HCI_SUCCESS;
 386                 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
 387
 388                 /* For all channels, send the event through their FSMs */
 389                 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
 390                 {
 391                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
 392                 }
 393             }
 394             break;
 395
 396         case L2CAP_CMD_CONN_REQ:
 397             if (p + 4 > p_next_cmd) {
 398                 android_errorWriteLog(0x534e4554, "74202041");
 399                 return;
 400             }
 401             STREAM_TO_UINT16 (con_info.psm, p);
 402             STREAM_TO_UINT16 (rcid, p);
 403             if ((p_rcb = l2cu_find_rcb_by_psm (con_info.psm)) == NULL)
 404             {
 405                 L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for unknown PSM: %d", con_info.psm);
 406                 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
 407                 break;
 408             }
 409             else
 410             {
 411                 if (!p_rcb->api.pL2CA_ConnectInd_Cb)
 412                 {
 413                     L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for outgoing-only connection PSM: %d", con_info.psm);
 414                     l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
 415                     break;
 416                 }
 417             }
 418             if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL)
 419             {
 420                 L2CAP_TRACE_ERROR ("L2CAP - unable to allocate CCB");
 421                 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_RESOURCES);
 422                 break;
 423             }
 424             p_ccb->remote_id = id;
 425             p_ccb->p_rcb = p_rcb;
 426             p_ccb->remote_cid = rcid;
 427
 428             l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_REQ, &con_info);
 429             break;
 430
 431         case L2CAP_CMD_CONN_RSP:
 432             if (p + 8 > p_next_cmd) {
 433                 android_errorWriteLog(0x534e4554, "74202041");
 434                 return;
 435             }
 436             STREAM_TO_UINT16 (con_info.remote_cid, p);
 437             STREAM_TO_UINT16 (lcid, p);
 438             STREAM_TO_UINT16 (con_info.l2cap_result, p);
 439             STREAM_TO_UINT16 (con_info.l2cap_status, p);
 440
 441             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) == NULL)
 442             {
 443                 L2CAP_TRACE_WARNING ("L2CAP - no CCB for conn rsp, LCID: %d RCID: %d",
 444                                       lcid, con_info.remote_cid);
 445                 break;
 446             }
 447             if (p_ccb->local_id != id)
 448             {
 449                 L2CAP_TRACE_WARNING ("L2CAP - con rsp - bad ID. Exp: %d Got: %d",
 450                                       p_ccb->local_id, id);
 451                 break;
 452             }
 453
 454             if (con_info.l2cap_result == L2CAP_CONN_OK)
 455                 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP, &con_info);
 456             else if (con_info.l2cap_result == L2CAP_CONN_PENDING)
 457                 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_PND, &con_info);
 458             else
 459                 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
 460
 461             break;
 462
 463         case L2CAP_CMD_CONFIG_REQ:
 464             p_cfg_end = p + cmd_len;
 465             cfg_rej = FALSE;
 466             cfg_rej_len = 0;
 467
 468             if (p + 4 > p_next_cmd) {
 469                 android_errorWriteLog(0x534e4554, "74202041");
 470                 return;
 471             }
 472             STREAM_TO_UINT16 (lcid, p);
 473             STREAM_TO_UINT16 (cfg_info.flags, p);
 474
 475             p_cfg_start = p;
 476
 477             cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
 478                 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
 479
 480             while (p < p_cfg_end)
 481             {
 482                 if (p + 2 > p_next_cmd) {
 483                     android_errorWriteLog(0x534e4554, "74202041");
 484                     return;
 485                 }
 486                 STREAM_TO_UINT8 (cfg_code, p);
 487                 STREAM_TO_UINT8 (cfg_len, p);
 488
 489                 switch (cfg_code & 0x7F)
 490                 {
 491                 case L2CAP_CFG_TYPE_MTU:
 492                     cfg_info.mtu_present = TRUE;
 493                     if (p + 2 > p_next_cmd) {
 494                         android_errorWriteLog(0x534e4554, "74202041");
 495                         return;
 496                     }
 497                     STREAM_TO_UINT16 (cfg_info.mtu, p);
 498                     break;
 499
 500                 case L2CAP_CFG_TYPE_FLUSH_TOUT:
 501                     cfg_info.flush_to_present = TRUE;
 502                     if (p + 2 > p_next_cmd) {
 503                         android_errorWriteLog(0x534e4554, "74202041");
 504                         return;
 505                     }
 506                     STREAM_TO_UINT16 (cfg_info.flush_to, p);
 507                     break;
 508
 509                 case L2CAP_CFG_TYPE_QOS:
 510                     cfg_info.qos_present = TRUE;
 511                     if (p + 2 + 5 * 4 > p_next_cmd) {
 512                         android_errorWriteLog(0x534e4554, "74202041");
 513                         return;
 514                     }
 515                     STREAM_TO_UINT8  (cfg_info.qos.qos_flags, p);
 516                     STREAM_TO_UINT8  (cfg_info.qos.service_type, p);
 517                     STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
 518                     STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
 519                     STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
 520                     STREAM_TO_UINT32 (cfg_info.qos.latency, p);
 521                     STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
 522                     break;
 523
 524                 case L2CAP_CFG_TYPE_FCR:
 525                     cfg_info.fcr_present = TRUE;
 526                     if (p + 3 + 3 * 2 > p_next_cmd) {
 527                         android_errorWriteLog(0x534e4554, "74202041");
 528                         return;
 529                     }
 530                     STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
 531                     STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
 532                     STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
 533                     STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
 534                     STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
 535                     STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
 536                     break;
 537
 538                 case L2CAP_CFG_TYPE_FCS:
 539                     cfg_info.fcs_present = TRUE;
 540                     if (p + 1 > p_next_cmd) {
 541                         android_errorWriteLog(0x534e4554, "74202041");
 542                         return;
 543                     }
 544                     STREAM_TO_UINT8 (cfg_info.fcs, p);
 545                     break;
 546
 547                 case L2CAP_CFG_TYPE_EXT_FLOW:
 548                     cfg_info.ext_flow_spec_present = TRUE;
 549                     if (p + 2 + 2 + 3 * 4 > p_next_cmd) {
 550                         android_errorWriteLog(0x534e4554, "74202041");
 551                         return;
 552                     }
 553                     STREAM_TO_UINT8  (cfg_info.ext_flow_spec.id, p);
 554                     STREAM_TO_UINT8  (cfg_info.ext_flow_spec.stype, p);
 555                     STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
 556                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
 557                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
 558                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
 559                     break;
 560
 561                 default:
 562                     /* sanity check option length */
 563                     if ((cfg_len + L2CAP_CFG_OPTION_OVERHEAD) <= cmd_len)
 564                     {
 565                         p += cfg_len;
 566                         if ((cfg_code & 0x80) == 0)
 567                         {
 568                             cfg_rej_len += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
 569                             cfg_rej = TRUE;
 570                         }
 571                     }
 572                     /* bad length; force loop exit */
 573                     else
 574                     {
 575                         p = p_cfg_end;
 576                         cfg_rej = TRUE;
 577                     }
 578                     break;
 579                 }
 580             }
 581
 582             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 583             {
 584                 p_ccb->remote_id = id;
 585                 if (cfg_rej)
 586                 {
 587                     l2cu_send_peer_config_rej (p_ccb, p_cfg_start, (UINT16) (cmd_len - L2CAP_CONFIG_REQ_LEN), cfg_rej_len);
 588                 }
 589                 else
 590                 {
 591                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_REQ, &cfg_info);
 592                 }
 593             }
 594             else
 595             {
 596                 /* updated spec says send command reject on invalid cid */
 597                 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_INVALID_CID, id, 0, 0);
 598             }
 599             break;
 600
 601         case L2CAP_CMD_CONFIG_RSP:
 602             p_cfg_end = p + cmd_len;
 603             if (p + 6 > p_next_cmd) {
 604                 android_errorWriteLog(0x534e4554, "74202041");
 605                 return;
 606             }
 607             STREAM_TO_UINT16 (lcid, p);
 608             STREAM_TO_UINT16 (cfg_info.flags, p);
 609             STREAM_TO_UINT16 (cfg_info.result, p);
 610
 611             cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
 612                 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
 613
 614             while (p < p_cfg_end)
 615             {
 616                 if (p + 2 > p_next_cmd) {
 617                     android_errorWriteLog(0x534e4554, "74202041");
 618                     return;
 619                 }
 620                 STREAM_TO_UINT8 (cfg_code, p);
 621                 STREAM_TO_UINT8 (cfg_len, p);
 622
 623                 switch (cfg_code & 0x7F)
 624                 {
 625                 case L2CAP_CFG_TYPE_MTU:
 626                     cfg_info.mtu_present = TRUE;
 627                     if (p + 2 > p_next_cmd) {
 628                         android_errorWriteLog(0x534e4554, "74202041");
 629                         return;
 630                     }
 631                     STREAM_TO_UINT16 (cfg_info.mtu, p);
 632                     break;
 633
 634                 case L2CAP_CFG_TYPE_FLUSH_TOUT:
 635                     cfg_info.flush_to_present = TRUE;
 636                     if (p + 2 > p_next_cmd) {
 637                         android_errorWriteLog(0x534e4554, "74202041");
 638                         return;
 639                     }
 640                     STREAM_TO_UINT16 (cfg_info.flush_to, p);
 641                     break;
 642
 643                 case L2CAP_CFG_TYPE_QOS:
 644                     cfg_info.qos_present = TRUE;
 645                     if (p + 2 + 5 * 4 > p_next_cmd) {
 646                         android_errorWriteLog(0x534e4554, "74202041");
 647                         return;
 648                     }
 649                     STREAM_TO_UINT8  (cfg_info.qos.qos_flags, p);
 650                     STREAM_TO_UINT8  (cfg_info.qos.service_type, p);
 651                     STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
 652                     STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
 653                     STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
 654                     STREAM_TO_UINT32 (cfg_info.qos.latency, p);
 655                     STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
 656                     break;
 657
 658                 case L2CAP_CFG_TYPE_FCR:
 659                     cfg_info.fcr_present = TRUE;
 660                     if (p + 3 + 3 * 2 > p_next_cmd) {
 661                         android_errorWriteLog(0x534e4554, "74202041");
 662                         return;
 663                     }
 664                     STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
 665                     STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
 666                     STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
 667                     STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
 668                     STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
 669                     STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
 670                     break;
 671
 672                 case L2CAP_CFG_TYPE_FCS:
 673                     cfg_info.fcs_present = TRUE;
 674                     if (p + 1 > p_next_cmd) {
 675                         android_errorWriteLog(0x534e4554, "74202041");
 676                         return;
 677                     }
 678                     STREAM_TO_UINT8 (cfg_info.fcs, p);
 679                     break;
 680
 681                 case L2CAP_CFG_TYPE_EXT_FLOW:
 682                     cfg_info.ext_flow_spec_present = TRUE;
 683                     if (p + 2 + 2 + 3 * 4 > p_next_cmd) {
 684                         android_errorWriteLog(0x534e4554, "74202041");
 685                         return;
 686                     }
 687                     STREAM_TO_UINT8  (cfg_info.ext_flow_spec.id, p);
 688                     STREAM_TO_UINT8  (cfg_info.ext_flow_spec.stype, p);
 689                     STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
 690                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
 691                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
 692                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
 693                     break;
 694                 }
 695             }
 696
 697             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 698             {
 699                 if (p_ccb->local_id != id)
 700                 {
 701                     L2CAP_TRACE_WARNING ("L2CAP - cfg rsp - bad ID. Exp: %d Got: %d",
 702                                           p_ccb->local_id, id);
 703                     break;
 704                 }
 705                 if ( (cfg_info.result == L2CAP_CFG_OK) || (cfg_info.result == L2CAP_CFG_PENDING) )
 706                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP, &cfg_info);
 707                 else
 708                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP_NEG, &cfg_info);
 709             }
 710             else
 711             {
 712                 L2CAP_TRACE_WARNING ("L2CAP - rcvd cfg rsp for unknown CID: 0x%04x", lcid);
 713             }
 714             break;
 715
 716         case L2CAP_CMD_DISC_REQ:
 717             if (p + 4 > p_next_cmd) {
 718                 android_errorWriteLog(0x534e4554, "74202041");
 719                 return;
 720             }
 721             STREAM_TO_UINT16 (lcid, p);
 722             STREAM_TO_UINT16 (rcid, p);
 723
 724             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 725             {
 726                 if (p_ccb->remote_cid == rcid)
 727                 {
 728                     p_ccb->remote_id = id;
 729                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_REQ, &con_info);
 730                 }
 731             }
 732             else
 733                 l2cu_send_peer_disc_rsp (p_lcb, id, lcid, rcid);
 734
 735             break;
 736
 737         case L2CAP_CMD_DISC_RSP:
 738             if (p + 4 > p_next_cmd) {
 739                 android_errorWriteLog(0x534e4554, "74202041");
 740                 return;
 741             }
 742             STREAM_TO_UINT16 (rcid, p);
 743             STREAM_TO_UINT16 (lcid, p);
 744
 745             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 746             {
 747                 if ((p_ccb->remote_cid == rcid) && (p_ccb->local_id == id))
 748                 {
 749                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_RSP, &con_info);
 750                 }
 751             }
 752             break;
 753
 754         case L2CAP_CMD_ECHO_REQ:
 755             l2cu_send_peer_echo_rsp (p_lcb, id, NULL, 0);
 756             break;
 757
 758         case L2CAP_CMD_ECHO_RSP:
 759             if (p_lcb->p_echo_rsp_cb)
 760             {
 761                 tL2CA_ECHO_RSP_CB *p_cb = p_lcb->p_echo_rsp_cb;
 762
 763                 /* Zero out the callback in case app immediately calls us again */
 764                 p_lcb->p_echo_rsp_cb = NULL;
 765
 766                 (*p_cb) (L2CAP_PING_RESULT_OK);
 767             }
 768             break;
 769
 770         case L2CAP_CMD_INFO_REQ:
 771             if (p + 2 > p_next_cmd) {
 772                 android_errorWriteLog(0x534e4554, "74202041");
 773                 return;
 774             }
 775             STREAM_TO_UINT16 (info_type, p);
 776             l2cu_send_peer_info_rsp (p_lcb, id, info_type);
 777             break;
 778
 779         case L2CAP_CMD_INFO_RSP:
 780             /* Stop the link connect timer if sent before L2CAP connection is up */
 781             if (p_lcb->w4_info_rsp)
 782             {
 783                 alarm_cancel(p_lcb->info_resp_timer);
 784                 p_lcb->w4_info_rsp = FALSE;
 785             }
 786
 787             if (p + 4 > p_next_cmd) {
 788                 android_errorWriteLog(0x534e4554, "74202041");
 789                 return;
 790             }
 791             STREAM_TO_UINT16 (info_type, p);
 792             STREAM_TO_UINT16 (result, p);
 793
 794             p_lcb->info_rx_bits |= (1 << info_type);
 795
 796             if ( (info_type == L2CAP_EXTENDED_FEATURES_INFO_TYPE)
 797               && (result == L2CAP_INFO_RESP_RESULT_SUCCESS) )
 798             {
 799                 if (p + 4 > p_next_cmd) {
 800                     android_errorWriteLog(0x534e4554, "74202041");
 801                     return;
 802                 }
 803                 STREAM_TO_UINT32( p_lcb->peer_ext_fea, p );
 804
 805 #if (L2CAP_NUM_FIXED_CHNLS > 0)
 806                 if (p_lcb->peer_ext_fea & L2CAP_EXTFEA_FIXED_CHNLS)
 807                 {
 808                     l2cu_send_peer_info_req (p_lcb, L2CAP_FIXED_CHANNELS_INFO_TYPE);
 809                     break;
 810                 }
 811                 else
 812                 {
 813                     l2cu_process_fixed_chnl_resp (p_lcb);
 814                 }
 815 #endif
 816             }
 817
 818 #if (L2CAP_NUM_FIXED_CHNLS > 0)
 819             if (info_type == L2CAP_FIXED_CHANNELS_INFO_TYPE)
 820             {
 821                 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
 822                 {
 823                     memcpy (p_lcb->peer_chnl_mask, p, L2CAP_FIXED_CHNL_ARRAY_SIZE);
 824                 }
 825
 826                 l2cu_process_fixed_chnl_resp (p_lcb);
 827             }
 828 #endif
 829 #if (L2CAP_UCD_INCLUDED == TRUE)
 830             else if (info_type == L2CAP_CONNLESS_MTU_INFO_TYPE)
 831             {
 832                 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
 833                 {
 834                     if (p + 2 > p_next_cmd) {
 835                         android_errorWriteLog(0x534e4554, "74202041");
 836                         return;
 837                     }
 838                     STREAM_TO_UINT16 (p_lcb->ucd_mtu, p);
 839                 }
 840             }
 841 #endif
 842
 843             ci.status = HCI_SUCCESS;
 844             memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
 845             for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
 846             {
 847                 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
 848             }
 849             break;
 850
 851         default:
 852             L2CAP_TRACE_WARNING ("L2CAP - bad cmd code: %d", cmd_code);
 853             l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0, 0);
 854             return;
 855         }
 856     }
 857 }
 858
 859 /*******************************************************************************
 860 **
 861 ** Function         l2c_process_held_packets
 862 **
 863 ** Description      This function processes any L2CAP packets that arrived before
 864 **                  the HCI connection complete arrived. It is a work around for
 865 **                  badly behaved controllers.
 866 **
 867 ** Returns          void
 868 **
 869 *******************************************************************************/
 870 void l2c_process_held_packets(BOOLEAN timed_out) {
 871     if (list_is_empty(l2cb.rcv_pending_q))
 872         return;
 873
 874     if (!timed_out) {
 875         alarm_cancel(l2cb.receive_hold_timer);
 876         L2CAP_TRACE_WARNING("L2CAP HOLD CONTINUE");
 877     } else {
 878         L2CAP_TRACE_WARNING("L2CAP HOLD TIMEOUT");
 879     }
 880
 881     for (const list_node_t *node = list_begin(l2cb.rcv_pending_q);
 882         node != list_end(l2cb.rcv_pending_q);)  {
 883         BT_HDR *p_buf = list_node(node);
 884         node = list_next(node);
 885         if (!timed_out || (!p_buf->layer_specific) || (--p_buf->layer_specific == 0)) {
 886             list_remove(l2cb.rcv_pending_q, p_buf);
 887             p_buf->layer_specific = 0xFFFF;
 888             l2c_rcv_acl_data(p_buf);
 889         }
 890     }
 891
 892     /* If anyone still in the queue, restart the timeout */
 893     if (!list_is_empty(l2cb.rcv_pending_q)) {
 894         alarm_set_on_queue(l2cb.receive_hold_timer, BT_1SEC_TIMEOUT_MS,
 895                            l2c_receive_hold_timer_timeout, NULL,
 896                            btu_general_alarm_queue);
 897     }
 898 }
 899
 900 /*******************************************************************************
 901 **
 902 ** Function         l2c_init
 903 **
 904 ** Description      This function is called once at startup to initialize
 905 **                  all the L2CAP structures
 906 **
 907 ** Returns          void
 908 **
 909 *******************************************************************************/
 910 void l2c_init (void)
 911 {
 912     INT16  xx;
 913
 914     memset (&l2cb, 0, sizeof (tL2C_CB));
 915     /* the psm is increased by 2 before being used */
 916     l2cb.dyn_psm = 0xFFF;
 917
 918     /* Put all the channel control blocks on the free queue */
 919     for (xx = 0; xx < MAX_L2CAP_CHANNELS - 1; xx++)
 920     {
 921         l2cb.ccb_pool[xx].p_next_ccb = &l2cb.ccb_pool[xx + 1];
 922     }
 923
 924 #if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
 925     /* it will be set to L2CAP_PKT_START_NON_FLUSHABLE if controller supports */
 926     l2cb.non_flushable_pbf = L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT;
 927 #endif
 928
 929     l2cb.p_free_ccb_first = &l2cb.ccb_pool[0];
 930     l2cb.p_free_ccb_last  = &l2cb.ccb_pool[MAX_L2CAP_CHANNELS - 1];
 931
 932 #ifdef L2CAP_DESIRED_LINK_ROLE
 933     l2cb.desire_role      = L2CAP_DESIRED_LINK_ROLE;
 934 #else
 935     l2cb.desire_role      = HCI_ROLE_SLAVE;
 936 #endif
 937
 938     /* Set the default idle timeout */
 939     l2cb.idle_timeout = L2CAP_LINK_INACTIVITY_TOUT;
 940
 941 #if defined(L2CAP_INITIAL_TRACE_LEVEL)
 942     l2cb.l2cap_trace_level = L2CAP_INITIAL_TRACE_LEVEL;
 943 #else
 944     l2cb.l2cap_trace_level = BT_TRACE_LEVEL_NONE;    /* No traces */
 945 #endif
 946
 947 #if L2CAP_CONFORMANCE_TESTING == TRUE
 948      /* Conformance testing needs a dynamic response */
 949     l2cb.test_info_resp = L2CAP_EXTFEA_SUPPORTED_MASK;
 950 #endif
 951
 952     /* Number of ACL buffers to use for high priority channel */
 953 #if (defined(L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE) && (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE))
 954     l2cb.high_pri_min_xmit_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA;
 955 #endif
 956
 957 #if BLE_INCLUDED == TRUE
 958     l2cb.l2c_ble_fixed_chnls_mask =
 959          L2CAP_FIXED_CHNL_ATT_BIT | L2CAP_FIXED_CHNL_BLE_SIG_BIT | L2CAP_FIXED_CHNL_SMP_BIT;
 960 #endif
 961
 962     l2cb.rcv_pending_q = list_new(NULL);
 963     if (l2cb.rcv_pending_q == NULL)
 964         LOG_ERROR(LOG_TAG, "%s unable to allocate memory for link layer control block", __func__);
 965     l2cb.receive_hold_timer = alarm_new("l2c.receive_hold_timer");
 966 }
 967
 968 void l2c_free(void) {
 969     list_free(l2cb.rcv_pending_q);
 970     l2cb.rcv_pending_q = NULL;
 971 }
 972
 973 void l2c_receive_hold_timer_timeout(UNUSED_ATTR void *data)
 974 {
 975     /* Update the timeouts in the hold queue */
 976     l2c_process_held_packets(TRUE);
 977 }
 978
 979 void l2c_ccb_timer_timeout(void *data)
 980 {
 981     tL2C_CCB *p_ccb = (tL2C_CCB *)data;
 982
 983     l2c_csm_execute(p_ccb, L2CEVT_TIMEOUT, NULL);
 984 }
 985
 986 void l2c_fcrb_ack_timer_timeout(void *data)
 987 {
 988     tL2C_CCB *p_ccb = (tL2C_CCB *)data;
 989
 990     l2c_csm_execute(p_ccb, L2CEVT_ACK_TIMEOUT, NULL);
 991 }
 992
 993 void l2c_lcb_timer_timeout(void *data)
 994 {
 995     tL2C_LCB *p_lcb = (tL2C_LCB *)data;
 996
 997     l2c_link_timeout(p_lcb);
 998 }
 999
1000 /*******************************************************************************
1001 **
1002 ** Function         l2c_data_write
1003 **
1004 ** Description      API functions call this function to write data.
1005 **
1006 ** Returns          L2CAP_DW_SUCCESS, if data accepted, else FALSE
1007 **                  L2CAP_DW_CONGESTED, if data accepted and the channel is congested
1008 **                  L2CAP_DW_FAILED, if error
1009 **
1010 *******************************************************************************/
1011 UINT8 l2c_data_write (UINT16 cid, BT_HDR *p_data, UINT16 flags)
1012 {
1013     tL2C_CCB        *p_ccb;
1014
1015     /* Find the channel control block. We don't know the link it is on. */
1016     if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL)
1017     {
1018         L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_DataWrite, CID: %d", cid);
1019         osi_free(p_data);
1020         return (L2CAP_DW_FAILED);
1021     }
1022
1023 #ifndef TESTER /* Tester may send any amount of data. otherwise sending message
1024                   bigger than mtu size of peer is a violation of protocol */
1025     UINT16 mtu;
1026
1027     if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE)
1028         mtu = p_ccb->peer_conn_cfg.mtu;
1029     else
1030         mtu = p_ccb->peer_cfg.mtu;
1031
1032     if (p_data->len > mtu)
1033     {
1034         L2CAP_TRACE_WARNING ("L2CAP - CID: 0x%04x  cannot send message bigger than peer's mtu size", cid);
1035         osi_free(p_data);
1036         return (L2CAP_DW_FAILED);
1037     }
1038 #endif
1039
1040     /* channel based, packet based flushable or non-flushable */
1041     p_data->layer_specific = flags;
1042
1043     /* If already congested, do not accept any more packets */
1044     if (p_ccb->cong_sent)
1045     {
1046         L2CAP_TRACE_ERROR ("L2CAP - CID: 0x%04x cannot send, already congested  xmit_hold_q.count: %u  buff_quota: %u",
1047                            p_ccb->local_cid,
1048                            fixed_queue_length(p_ccb->xmit_hold_q),
1049                            p_ccb->buff_quota);
1050
1051         osi_free(p_data);
1052         return (L2CAP_DW_FAILED);
1053     }
1054
1055
1056     l2c_csm_execute (p_ccb, L2CEVT_L2CA_DATA_WRITE, p_data);
1057
1058     if (p_ccb->cong_sent)
1059         return (L2CAP_DW_CONGESTED);
1060
1061     return (L2CAP_DW_SUCCESS);
1062 }
1063