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 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28
  29 #include "device/include/controller.h"
  30 #include "btcore/include/counter.h"
  31 #include "bt_target.h"
  32 #include "btm_int.h"
  33 #include "btu.h"
  34 #include "gki.h"
  35 #include "hcimsgs.h"
  36 #include "l2c_api.h"
  37 #include "l2c_int.h"
  38 #include "l2cdefs.h"
  39 #include "osi/include/log.h"
  40
  41 /********************************************************************************/
  42 /*              L O C A L    F U N C T I O N     P R O T O T Y P E S            */
  43 /********************************************************************************/
  44 static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len);
  45
  46 /********************************************************************************/
  47 /*                 G L O B A L      L 2 C A P       D A T A                     */
  48 /********************************************************************************/
  49 #if L2C_DYNAMIC_MEMORY == FALSE
  50 tL2C_CB l2cb;
  51 #endif
  52
  53 /*******************************************************************************
  54 **
  55 ** Function         l2c_bcst_msg
  56 **
  57 ** Description
  58 **
  59 ** Returns          void
  60 **
  61 *******************************************************************************/
  62 void l2c_bcst_msg( BT_HDR *p_buf, UINT16 psm )
  63 {
  64     UINT8       *p;
  65
  66     /* Ensure we have enough space in the buffer for the L2CAP and HCI headers */
  67     if (p_buf->offset < L2CAP_BCST_MIN_OFFSET)
  68     {
  69         L2CAP_TRACE_ERROR ("L2CAP - cannot send buffer, offset: %d", p_buf->offset);
  70         GKI_freebuf (p_buf);
  71         return;
  72     }
  73
  74     /* Step back some bytes to add the headers */
  75     p_buf->offset -= (HCI_DATA_PREAMBLE_SIZE + L2CAP_PKT_OVERHEAD + L2CAP_BCST_OVERHEAD);
  76     p_buf->len    += L2CAP_PKT_OVERHEAD + L2CAP_BCST_OVERHEAD;
  77
  78     /* Set the pointer to the beginning of the data */
  79     p = (UINT8 *)(p_buf + 1) + p_buf->offset;
  80
  81     /* First, the HCI transport header */
  82     UINT16_TO_STREAM (p, 0x0050 | (L2CAP_PKT_START << 12) | (2 << 14));
  83
  84     uint16_t acl_data_size = controller_get_interface()->get_acl_data_size_classic();
  85     /* The HCI transport will segment the buffers. */
  86     if (p_buf->len > acl_data_size)
  87     {
  88         UINT16_TO_STREAM (p, 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 <= controller_get_interface()->get_acl_packet_size_classic())
 103     {
 104         counter_add("l2cap.ch2.tx.bytes", p_buf->len);
 105         counter_add("l2cap.ch2.tx.pkts", 1);
 106
 107         bte_main_hci_send(p_buf, BT_EVT_TO_LM_HCI_ACL);
 108     }
 109 }
 110
 111
 112 /*******************************************************************************
 113 **
 114 ** Function         l2c_rcv_acl_data
 115 **
 116 ** Description      This function is called from the HCI Interface when an ACL
 117 **                  data packet is received.
 118 **
 119 ** Returns          void
 120 **
 121 *******************************************************************************/
 122 void l2c_rcv_acl_data (BT_HDR *p_msg)
 123 {
 124     UINT8       *p = (UINT8 *)(p_msg + 1) + p_msg->offset;
 125     UINT16      handle, hci_len;
 126     UINT8       pkt_type;
 127     tL2C_LCB    *p_lcb;
 128     tL2C_CCB    *p_ccb = NULL;
 129     UINT16      l2cap_len, rcv_cid, psm;
 130
 131     /* Extract the handle */
 132     STREAM_TO_UINT16 (handle, p);
 133     pkt_type = HCID_GET_EVENT (handle);
 134     handle   = HCID_GET_HANDLE (handle);
 135
 136     /* Since the HCI Transport is putting segmented packets back together, we */
 137     /* should never get a valid packet with the type set to "continuation"    */
 138     if (pkt_type != L2CAP_PKT_CONTINUE)
 139     {
 140         /* Find the LCB based on the handle */
 141         if ((p_lcb = l2cu_find_lcb_by_handle (handle)) == NULL)
 142         {
 143             UINT8       cmd_code;
 144
 145             /* There is a slight possibility (specifically with USB) that we get an */
 146             /* L2CAP connection request before we get the HCI connection complete.  */
 147             /* So for these types of messages, hold them for up to 2 seconds.       */
 148             STREAM_TO_UINT16 (hci_len, p);
 149             STREAM_TO_UINT16 (l2cap_len, p);
 150             STREAM_TO_UINT16 (rcv_cid, p);
 151             STREAM_TO_UINT8  (cmd_code, p);
 152
 153             if ((p_msg->layer_specific == 0) && (rcv_cid == L2CAP_SIGNALLING_CID)
 154                     && (cmd_code == L2CAP_CMD_INFO_REQ || cmd_code == L2CAP_CMD_CONN_REQ)) {
 155                 L2CAP_TRACE_WARNING ("L2CAP - holding ACL for unknown handle:%d ls:%d"
 156                         "  cid:%d opcode:%d cur count:%d", handle, p_msg->layer_specific,
 157                         rcv_cid, cmd_code, list_length(l2cb.rcv_pending_q));
 158                 p_msg->layer_specific = 2;
 159                 list_append(l2cb.rcv_pending_q, p_msg);
 160
 161                 if (list_length(l2cb.rcv_pending_q) == 1)
 162                     btu_start_timer (&l2cb.rcv_hold_tle, BTU_TTYPE_L2CAP_HOLD, BT_1SEC_TIMEOUT);
 163
 164                 return;
 165             } else {
 166                 L2CAP_TRACE_ERROR ("L2CAP - rcvd ACL for unknown handle:%d ls:%d cid:%d"
 167                         " opcode:%d cur count:%d", handle, p_msg->layer_specific, rcv_cid,
 168                         cmd_code, list_length(l2cb.rcv_pending_q));
 169             }
 170             GKI_freebuf (p_msg);
 171             return;
 172         }
 173     }
 174     else
 175     {
 176         L2CAP_TRACE_WARNING ("L2CAP - expected pkt start or complete, got: %d", pkt_type);
 177         GKI_freebuf (p_msg);
 178         return;
 179     }
 180
 181     /* Extract the length and update the buffer header */
 182     STREAM_TO_UINT16 (hci_len, p);
 183     p_msg->offset += 4;
 184
 185     /* Extract the length and CID */
 186     STREAM_TO_UINT16 (l2cap_len, p);
 187     STREAM_TO_UINT16 (rcv_cid, p);
 188
 189     /* Find the CCB for this CID */
 190     if (rcv_cid >= L2CAP_BASE_APPL_CID)
 191     {
 192         if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, rcv_cid)) == NULL)
 193         {
 194             L2CAP_TRACE_WARNING ("L2CAP - unknown CID: 0x%04x", rcv_cid);
 195             GKI_freebuf (p_msg);
 196             return;
 197         }
 198     }
 199
 200     if (hci_len >= L2CAP_PKT_OVERHEAD)  /* Must receive at least the L2CAP length and CID.*/
 201     {
 202         p_msg->len    = hci_len - L2CAP_PKT_OVERHEAD;
 203         p_msg->offset += L2CAP_PKT_OVERHEAD;
 204     }
 205     else
 206     {
 207         L2CAP_TRACE_WARNING ("L2CAP - got incorrect hci header" );
 208         GKI_freebuf (p_msg);
 209         return;
 210     }
 211
 212     if (l2cap_len != p_msg->len)
 213     {
 214         L2CAP_TRACE_WARNING ("L2CAP - bad length in pkt. Exp: %d  Act: %d",
 215                               l2cap_len, p_msg->len);
 216
 217         GKI_freebuf (p_msg);
 218         return;
 219     }
 220
 221     /* Send the data through the channel state machine */
 222     if (rcv_cid == L2CAP_SIGNALLING_CID)
 223     {
 224         counter_add("l2cap.sig.rx.bytes", l2cap_len);
 225         counter_add("l2cap.sig.rx.pkts", 1);
 226         process_l2cap_cmd (p_lcb, p, l2cap_len);
 227         GKI_freebuf (p_msg);
 228     }
 229     else if (rcv_cid == L2CAP_CONNECTIONLESS_CID)
 230     {
 231         counter_add("l2cap.ch2.rx.bytes", l2cap_len);
 232         counter_add("l2cap.ch2.rx.pkts", 1);
 233         /* process_connectionless_data (p_lcb); */
 234         STREAM_TO_UINT16 (psm, p);
 235         L2CAP_TRACE_DEBUG( "GOT CONNECTIONLESS DATA PSM:%d", psm ) ;
 236
 237 #if (L2CAP_UCD_INCLUDED == TRUE)
 238         /* if it is not broadcast, check UCD registration */
 239         if ( l2c_ucd_check_rx_pkts( p_lcb, p_msg ) )
 240         {
 241             /* nothing to do */
 242         }
 243         else
 244 #endif
 245             GKI_freebuf (p_msg);
 246     }
 247 #if (BLE_INCLUDED == TRUE)
 248     else if (rcv_cid == L2CAP_BLE_SIGNALLING_CID)
 249     {
 250         counter_add("l2cap.ble.rx.bytes", l2cap_len);
 251         counter_add("l2cap.ble.rx.pkts", 1);
 252         l2cble_process_sig_cmd (p_lcb, p, l2cap_len);
 253         GKI_freebuf (p_msg);
 254     }
 255 #endif
 256 #if (L2CAP_NUM_FIXED_CHNLS > 0)
 257     else if ((rcv_cid >= L2CAP_FIRST_FIXED_CHNL) && (rcv_cid <= L2CAP_LAST_FIXED_CHNL) &&
 258              (l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb != NULL) )
 259     {
 260         counter_add("l2cap.fix.rx.bytes", l2cap_len);
 261         counter_add("l2cap.fix.rx.pkts", 1);
 262         /* If no CCB for this channel, allocate one */
 263         if (p_lcb &&
 264             /* discard fixed channel data when link is disconnecting */
 265             (p_lcb->link_state != LST_DISCONNECTING) &&
 266             l2cu_initialize_fixed_ccb (p_lcb, rcv_cid,
 267                 &l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts))
 268         {
 269 #if(defined BLE_INCLUDED && (BLE_INCLUDED == TRUE))
 270             l2cble_notify_le_connection(p_lcb->remote_bd_addr);
 271 #endif
 272             p_ccb = p_lcb->p_fixed_ccbs[rcv_cid - L2CAP_FIRST_FIXED_CHNL];
 273
 274             if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE)
 275                 l2c_fcr_proc_pdu (p_ccb, p_msg);
 276             else
 277                 (*l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)(p_lcb->remote_bd_addr, p_msg);
 278         }
 279         else
 280             GKI_freebuf (p_msg);
 281     }
 282 #endif
 283
 284     else
 285     {
 286         counter_add("l2cap.dyn.rx.bytes", l2cap_len);
 287         counter_add("l2cap.dyn.rx.pkts", 1);
 288         if (p_ccb == NULL)
 289             GKI_freebuf (p_msg);
 290         else
 291         {
 292             /* Basic mode packets go straight to the state machine */
 293             if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE)
 294                 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_msg);
 295             else
 296             {
 297                 /* eRTM or streaming mode, so we need to validate states first */
 298                 if ((p_ccb->chnl_state == CST_OPEN) || (p_ccb->chnl_state == CST_CONFIG))
 299                     l2c_fcr_proc_pdu (p_ccb, p_msg);
 300                 else
 301                     GKI_freebuf (p_msg);
 302             }
 303         }
 304     }
 305 }
 306
 307 /*******************************************************************************
 308 **
 309 ** Function         process_l2cap_cmd
 310 **
 311 ** Description      This function is called when a packet is received on the
 312 **                  L2CAP signalling CID
 313 **
 314 ** Returns          void
 315 **
 316 *******************************************************************************/
 317 static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len)
 318 {
 319     UINT8           *p_pkt_end, *p_next_cmd, *p_cfg_end, *p_cfg_start;
 320     UINT8           cmd_code, cfg_code, cfg_len, id;
 321     tL2C_CONN_INFO  con_info;
 322     tL2CAP_CFG_INFO cfg_info;
 323     UINT16          rej_reason, rej_mtu, lcid, rcid, info_type;
 324     tL2C_CCB        *p_ccb;
 325     tL2C_RCB        *p_rcb;
 326     BOOLEAN         cfg_rej, pkt_size_rej = FALSE;
 327     UINT16          cfg_rej_len, cmd_len;
 328     UINT16          result;
 329     tL2C_CONN_INFO  ci;
 330
 331 #if (defined BLE_INCLUDED && BLE_INCLUDED == TRUE)
 332     /* if l2cap command received in CID 1 on top of an LE link, ignore this command */
 333     if (p_lcb->transport == BT_TRANSPORT_LE)
 334         return;
 335 #endif
 336
 337     /* Reject the packet if it exceeds the default Signalling Channel MTU */
 338     if (pkt_len > L2CAP_DEFAULT_MTU)
 339     {
 340         /* Core Spec requires a single response to the first command found in a multi-command
 341         ** L2cap packet.  If only responses in the packet, then it will be ignored.
 342         ** Here we simply mark the bad packet and decide which cmd ID to reject later
 343         */
 344         pkt_size_rej = TRUE;
 345         L2CAP_TRACE_ERROR ("L2CAP SIG MTU Pkt Len Exceeded (672) -> pkt_len: %d", pkt_len);
 346     }
 347
 348     p_next_cmd = p;
 349     p_pkt_end  = p + pkt_len;
 350
 351     memset (&cfg_info, 0, sizeof(cfg_info));
 352
 353     /* An L2CAP packet may contain multiple commands */
 354     while (TRUE)
 355     {
 356         /* Smallest command is 4 bytes */
 357         if ((p = p_next_cmd) > (p_pkt_end - 4))
 358             break;
 359
 360         STREAM_TO_UINT8  (cmd_code, p);
 361         STREAM_TO_UINT8  (id, p);
 362         STREAM_TO_UINT16 (cmd_len, p);
 363
 364         /* Check command length does not exceed packet length */
 365         if ((p_next_cmd = p + cmd_len) > p_pkt_end)
 366         {
 367             L2CAP_TRACE_WARNING ("Command len bad  pkt_len: %d  cmd_len: %d  code: %d",
 368                                   pkt_len, cmd_len, cmd_code);
 369             break;
 370         }
 371
 372         L2CAP_TRACE_DEBUG ("cmd_code: %d, id:%d, cmd_len:%d", cmd_code, id, cmd_len);
 373
 374         /* Bad L2CAP packet length, look or cmd to reject */
 375         if (pkt_size_rej)
 376         {
 377             /* If command found rejected it and we're done, otherwise keep looking */
 378             if (l2c_is_cmd_rejected(cmd_code, id, p_lcb))
 379                 return;
 380             else
 381                 continue; /* Look for next cmd/response in current packet */
 382         }
 383
 384         switch (cmd_code)
 385         {
 386         case L2CAP_CMD_REJECT:
 387             STREAM_TO_UINT16 (rej_reason, p);
 388             if (rej_reason == L2CAP_CMD_REJ_MTU_EXCEEDED)
 389             {
 390                 STREAM_TO_UINT16 (rej_mtu, p);
 391                 /* What to do with the MTU reject ? We have negotiated an MTU. For now */
 392                 /* we will ignore it and let a higher protocol timeout take care of it */
 393
 394                 L2CAP_TRACE_WARNING ("L2CAP - MTU rej Handle: %d MTU: %d", p_lcb->handle, rej_mtu);
 395             }
 396             if (rej_reason == L2CAP_CMD_REJ_INVALID_CID)
 397             {
 398                 STREAM_TO_UINT16 (rcid, p);
 399                 STREAM_TO_UINT16 (lcid, p);
 400
 401                 L2CAP_TRACE_WARNING ("L2CAP - rej with CID invalid, LCID: 0x%04x RCID: 0x%04x", lcid, rcid);
 402
 403                 /* Remote CID invalid. Treat as a disconnect */
 404                 if (((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 405                  && (p_ccb->remote_cid == rcid))
 406                 {
 407                     /* Fake link disconnect - no reply is generated */
 408                     l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
 409                 }
 410             }
 411
 412             /* SonyEricsson Info request Bug workaround (Continue connection) */
 413             else if (rej_reason == L2CAP_CMD_REJ_NOT_UNDERSTOOD && p_lcb->w4_info_rsp)
 414             {
 415                 btu_stop_timer (&p_lcb->info_timer_entry);
 416
 417                 p_lcb->w4_info_rsp = FALSE;
 418                 ci.status = HCI_SUCCESS;
 419                 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
 420
 421                 /* For all channels, send the event through their FSMs */
 422                 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
 423                 {
 424                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
 425                 }
 426             }
 427             break;
 428
 429         case L2CAP_CMD_CONN_REQ:
 430             STREAM_TO_UINT16 (con_info.psm, p);
 431             STREAM_TO_UINT16 (rcid, p);
 432             if ((p_rcb = l2cu_find_rcb_by_psm (con_info.psm)) == NULL)
 433             {
 434                 L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for unknown PSM: %d", con_info.psm);
 435                 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
 436                 break;
 437             }
 438             else
 439             {
 440                 if (!p_rcb->api.pL2CA_ConnectInd_Cb)
 441                 {
 442                     L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for outgoing-only connection PSM: %d", con_info.psm);
 443                     l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
 444                     break;
 445                 }
 446             }
 447             if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL)
 448             {
 449                 L2CAP_TRACE_ERROR ("L2CAP - unable to allocate CCB");
 450                 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_RESOURCES);
 451                 break;
 452             }
 453             p_ccb->remote_id = id;
 454             p_ccb->p_rcb = p_rcb;
 455             p_ccb->remote_cid = rcid;
 456
 457             l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_REQ, &con_info);
 458             break;
 459
 460         case L2CAP_CMD_CONN_RSP:
 461             STREAM_TO_UINT16 (con_info.remote_cid, p);
 462             STREAM_TO_UINT16 (lcid, p);
 463             STREAM_TO_UINT16 (con_info.l2cap_result, p);
 464             STREAM_TO_UINT16 (con_info.l2cap_status, p);
 465
 466             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) == NULL)
 467             {
 468                 L2CAP_TRACE_WARNING ("L2CAP - no CCB for conn rsp, LCID: %d RCID: %d",
 469                                       lcid, con_info.remote_cid);
 470                 break;
 471             }
 472             if (p_ccb->local_id != id)
 473             {
 474                 L2CAP_TRACE_WARNING ("L2CAP - con rsp - bad ID. Exp: %d Got: %d",
 475                                       p_ccb->local_id, id);
 476                 break;
 477             }
 478
 479             if (con_info.l2cap_result == L2CAP_CONN_OK)
 480                 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP, &con_info);
 481             else if (con_info.l2cap_result == L2CAP_CONN_PENDING)
 482                 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_PND, &con_info);
 483             else
 484                 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
 485
 486             break;
 487
 488         case L2CAP_CMD_CONFIG_REQ:
 489             p_cfg_end = p + cmd_len;
 490             cfg_rej = FALSE;
 491             cfg_rej_len = 0;
 492
 493             STREAM_TO_UINT16 (lcid, p);
 494             STREAM_TO_UINT16 (cfg_info.flags, p);
 495
 496             p_cfg_start = p;
 497
 498             cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
 499                 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
 500
 501             while (p < p_cfg_end)
 502             {
 503                 STREAM_TO_UINT8 (cfg_code, p);
 504                 STREAM_TO_UINT8 (cfg_len, p);
 505
 506                 switch (cfg_code & 0x7F)
 507                 {
 508                 case L2CAP_CFG_TYPE_MTU:
 509                     cfg_info.mtu_present = TRUE;
 510                     STREAM_TO_UINT16 (cfg_info.mtu, p);
 511                     break;
 512
 513                 case L2CAP_CFG_TYPE_FLUSH_TOUT:
 514                     cfg_info.flush_to_present = TRUE;
 515                     STREAM_TO_UINT16 (cfg_info.flush_to, p);
 516                     break;
 517
 518                 case L2CAP_CFG_TYPE_QOS:
 519                     cfg_info.qos_present = TRUE;
 520                     STREAM_TO_UINT8  (cfg_info.qos.qos_flags, p);
 521                     STREAM_TO_UINT8  (cfg_info.qos.service_type, p);
 522                     STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
 523                     STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
 524                     STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
 525                     STREAM_TO_UINT32 (cfg_info.qos.latency, p);
 526                     STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
 527                     break;
 528
 529                 case L2CAP_CFG_TYPE_FCR:
 530                     cfg_info.fcr_present = TRUE;
 531                     STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
 532                     STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
 533                     STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
 534                     STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
 535                     STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
 536                     STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
 537                     break;
 538
 539                 case L2CAP_CFG_TYPE_FCS:
 540                     cfg_info.fcs_present = TRUE;
 541                     STREAM_TO_UINT8 (cfg_info.fcs, p);
 542                     break;
 543
 544                 case L2CAP_CFG_TYPE_EXT_FLOW:
 545                     cfg_info.ext_flow_spec_present = TRUE;
 546                     STREAM_TO_UINT8  (cfg_info.ext_flow_spec.id, p);
 547                     STREAM_TO_UINT8  (cfg_info.ext_flow_spec.stype, p);
 548                     STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
 549                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
 550                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
 551                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
 552                     break;
 553
 554                 default:
 555                     /* sanity check option length */
 556                     if ((cfg_len + L2CAP_CFG_OPTION_OVERHEAD) <= cmd_len)
 557                     {
 558                         p += cfg_len;
 559                         if ((cfg_code & 0x80) == 0)
 560                         {
 561                             cfg_rej_len += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
 562                             cfg_rej = TRUE;
 563                         }
 564                     }
 565                     /* bad length; force loop exit */
 566                     else
 567                     {
 568                         p = p_cfg_end;
 569                         cfg_rej = TRUE;
 570                     }
 571                     break;
 572                 }
 573             }
 574
 575             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 576             {
 577                 p_ccb->remote_id = id;
 578                 if (cfg_rej)
 579                 {
 580                     l2cu_send_peer_config_rej (p_ccb, p_cfg_start, (UINT16) (cmd_len - L2CAP_CONFIG_REQ_LEN), cfg_rej_len);
 581                 }
 582                 else
 583                 {
 584                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_REQ, &cfg_info);
 585                 }
 586             }
 587             else
 588             {
 589                 /* updated spec says send command reject on invalid cid */
 590                 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_INVALID_CID, id, 0, 0);
 591             }
 592             break;
 593
 594         case L2CAP_CMD_CONFIG_RSP:
 595             p_cfg_end = p + cmd_len;
 596             STREAM_TO_UINT16 (lcid, p);
 597             STREAM_TO_UINT16 (cfg_info.flags, p);
 598             STREAM_TO_UINT16 (cfg_info.result, p);
 599
 600             cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
 601                 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
 602
 603             while (p < p_cfg_end)
 604             {
 605                 STREAM_TO_UINT8 (cfg_code, p);
 606                 STREAM_TO_UINT8 (cfg_len, p);
 607
 608                 switch (cfg_code & 0x7F)
 609                 {
 610                 case L2CAP_CFG_TYPE_MTU:
 611                     cfg_info.mtu_present = TRUE;
 612                     STREAM_TO_UINT16 (cfg_info.mtu, p);
 613                     break;
 614
 615                 case L2CAP_CFG_TYPE_FLUSH_TOUT:
 616                     cfg_info.flush_to_present = TRUE;
 617                     STREAM_TO_UINT16 (cfg_info.flush_to, p);
 618                     break;
 619
 620                 case L2CAP_CFG_TYPE_QOS:
 621                     cfg_info.qos_present = TRUE;
 622                     STREAM_TO_UINT8  (cfg_info.qos.qos_flags, p);
 623                     STREAM_TO_UINT8  (cfg_info.qos.service_type, p);
 624                     STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
 625                     STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
 626                     STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
 627                     STREAM_TO_UINT32 (cfg_info.qos.latency, p);
 628                     STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
 629                     break;
 630
 631                 case L2CAP_CFG_TYPE_FCR:
 632                     cfg_info.fcr_present = TRUE;
 633                     STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
 634                     STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
 635                     STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
 636                     STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
 637                     STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
 638                     STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
 639                     break;
 640
 641                 case L2CAP_CFG_TYPE_FCS:
 642                     cfg_info.fcs_present = TRUE;
 643                     STREAM_TO_UINT8 (cfg_info.fcs, p);
 644                     break;
 645
 646                 case L2CAP_CFG_TYPE_EXT_FLOW:
 647                     cfg_info.ext_flow_spec_present = TRUE;
 648                     STREAM_TO_UINT8  (cfg_info.ext_flow_spec.id, p);
 649                     STREAM_TO_UINT8  (cfg_info.ext_flow_spec.stype, p);
 650                     STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
 651                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
 652                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
 653                     STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
 654                     break;
 655                 }
 656             }
 657
 658             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 659             {
 660                 if (p_ccb->local_id != id)
 661                 {
 662                     L2CAP_TRACE_WARNING ("L2CAP - cfg rsp - bad ID. Exp: %d Got: %d",
 663                                           p_ccb->local_id, id);
 664                     break;
 665                 }
 666                 if ( (cfg_info.result == L2CAP_CFG_OK) || (cfg_info.result == L2CAP_CFG_PENDING) )
 667                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP, &cfg_info);
 668                 else
 669                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP_NEG, &cfg_info);
 670             }
 671             else
 672             {
 673                 L2CAP_TRACE_WARNING ("L2CAP - rcvd cfg rsp for unknown CID: 0x%04x", lcid);
 674             }
 675             break;
 676
 677
 678         case L2CAP_CMD_DISC_REQ:
 679             STREAM_TO_UINT16 (lcid, p);
 680             STREAM_TO_UINT16 (rcid, p);
 681
 682             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 683             {
 684                 if (p_ccb->remote_cid == rcid)
 685                 {
 686                     p_ccb->remote_id = id;
 687                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_REQ, &con_info);
 688                 }
 689             }
 690             else
 691                 l2cu_send_peer_disc_rsp (p_lcb, id, lcid, rcid);
 692
 693             break;
 694
 695         case L2CAP_CMD_DISC_RSP:
 696             STREAM_TO_UINT16 (rcid, p);
 697             STREAM_TO_UINT16 (lcid, p);
 698
 699             if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
 700             {
 701                 if ((p_ccb->remote_cid == rcid) && (p_ccb->local_id == id))
 702                 {
 703                     l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_RSP, &con_info);
 704                 }
 705             }
 706             break;
 707
 708         case L2CAP_CMD_ECHO_REQ:
 709             l2cu_send_peer_echo_rsp (p_lcb, id, NULL, 0);
 710             break;
 711
 712         case L2CAP_CMD_ECHO_RSP:
 713             if (p_lcb->p_echo_rsp_cb)
 714             {
 715                 tL2CA_ECHO_RSP_CB *p_cb = p_lcb->p_echo_rsp_cb;
 716
 717                 /* Zero out the callback in case app immediately calls us again */
 718                 p_lcb->p_echo_rsp_cb = NULL;
 719
 720                 (*p_cb) (L2CAP_PING_RESULT_OK);
 721             }
 722             break;
 723
 724         case L2CAP_CMD_INFO_REQ:
 725             STREAM_TO_UINT16 (info_type, p);
 726             l2cu_send_peer_info_rsp (p_lcb, id, info_type);
 727             break;
 728
 729         case L2CAP_CMD_INFO_RSP:
 730             /* Stop the link connect timer if sent before L2CAP connection is up */
 731             if (p_lcb->w4_info_rsp)
 732             {
 733                 btu_stop_timer (&p_lcb->info_timer_entry);
 734                 p_lcb->w4_info_rsp = FALSE;
 735             }
 736
 737             STREAM_TO_UINT16 (info_type, p);
 738             STREAM_TO_UINT16 (result, p);
 739
 740             p_lcb->info_rx_bits |= (1 << info_type);
 741
 742             if ( (info_type == L2CAP_EXTENDED_FEATURES_INFO_TYPE)
 743               && (result == L2CAP_INFO_RESP_RESULT_SUCCESS) )
 744             {
 745                 STREAM_TO_UINT32( p_lcb->peer_ext_fea, p );
 746
 747 #if (L2CAP_NUM_FIXED_CHNLS > 0)
 748                 if (p_lcb->peer_ext_fea & L2CAP_EXTFEA_FIXED_CHNLS)
 749                 {
 750                     l2cu_send_peer_info_req (p_lcb, L2CAP_FIXED_CHANNELS_INFO_TYPE);
 751                     break;
 752                 }
 753                 else
 754                 {
 755                     l2cu_process_fixed_chnl_resp (p_lcb);
 756                 }
 757 #endif
 758             }
 759
 760
 761 #if (L2CAP_NUM_FIXED_CHNLS > 0)
 762             if (info_type == L2CAP_FIXED_CHANNELS_INFO_TYPE)
 763             {
 764                 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
 765                 {
 766                     memcpy (p_lcb->peer_chnl_mask, p, L2CAP_FIXED_CHNL_ARRAY_SIZE);
 767                 }
 768
 769                 l2cu_process_fixed_chnl_resp (p_lcb);
 770             }
 771 #endif
 772 #if (L2CAP_UCD_INCLUDED == TRUE)
 773             else if (info_type == L2CAP_CONNLESS_MTU_INFO_TYPE)
 774             {
 775                 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
 776                 {
 777                     STREAM_TO_UINT16 (p_lcb->ucd_mtu, p);
 778                 }
 779             }
 780 #endif
 781
 782             ci.status = HCI_SUCCESS;
 783             memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
 784             for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
 785             {
 786                 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
 787             }
 788             break;
 789
 790         default:
 791             L2CAP_TRACE_WARNING ("L2CAP - bad cmd code: %d", cmd_code);
 792             l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0, 0);
 793             return;
 794         }
 795     }
 796 }
 797
 798 /*******************************************************************************
 799 **
 800 ** Function         l2c_process_held_packets
 801 **
 802 ** Description      This function processes any L2CAP packets that arrived before
 803 **                  the HCI connection complete arrived. It is a work around for
 804 **                  badly behaved controllers.
 805 **
 806 ** Returns          void
 807 **
 808 *******************************************************************************/
 809 void l2c_process_held_packets(BOOLEAN timed_out) {
 810     if (list_is_empty(l2cb.rcv_pending_q))
 811         return;
 812
 813     if (!timed_out) {
 814         btu_stop_timer(&l2cb.rcv_hold_tle);
 815         L2CAP_TRACE_WARNING("L2CAP HOLD CONTINUE");
 816     } else {
 817         L2CAP_TRACE_WARNING("L2CAP HOLD TIMEOUT");
 818     }
 819
 820     for (const list_node_t *node = list_begin(l2cb.rcv_pending_q);
 821         node != list_end(l2cb.rcv_pending_q);)  {
 822         BT_HDR *p_buf = list_node(node);
 823         node = list_next(node);
 824         if (!timed_out || (!p_buf->layer_specific) || (--p_buf->layer_specific == 0)) {
 825             list_remove(l2cb.rcv_pending_q, p_buf);
 826             p_buf->layer_specific = 0xFFFF;
 827             l2c_rcv_acl_data(p_buf);
 828         }
 829     }
 830
 831     /* If anyone still in the queue, restart the timeout */
 832     if (!list_is_empty(l2cb.rcv_pending_q))
 833         btu_start_timer (&l2cb.rcv_hold_tle, BTU_TTYPE_L2CAP_HOLD, BT_1SEC_TIMEOUT);
 834 }
 835
 836
 837 /*******************************************************************************
 838 **
 839 ** Function         l2c_init
 840 **
 841 ** Description      This function is called once at startup to initialize
 842 **                  all the L2CAP structures
 843 **
 844 ** Returns          void
 845 **
 846 *******************************************************************************/
 847 void l2c_init (void)
 848 {
 849     INT16  xx;
 850
 851     memset (&l2cb, 0, sizeof (tL2C_CB));
 852     /* the psm is increased by 2 before being used */
 853     l2cb.dyn_psm = 0xFFF;
 854
 855     /* Put all the channel control blocks on the free queue */
 856     for (xx = 0; xx < MAX_L2CAP_CHANNELS - 1; xx++)
 857     {
 858         l2cb.ccb_pool[xx].p_next_ccb = &l2cb.ccb_pool[xx + 1];
 859     }
 860
 861 #if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
 862     /* it will be set to L2CAP_PKT_START_NON_FLUSHABLE if controller supports */
 863     l2cb.non_flushable_pbf = L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT;
 864 #endif
 865
 866
 867     l2cb.p_free_ccb_first = &l2cb.ccb_pool[0];
 868     l2cb.p_free_ccb_last  = &l2cb.ccb_pool[MAX_L2CAP_CHANNELS - 1];
 869
 870 #ifdef L2CAP_DESIRED_LINK_ROLE
 871     l2cb.desire_role      = L2CAP_DESIRED_LINK_ROLE;
 872 #else
 873     l2cb.desire_role      = HCI_ROLE_SLAVE;
 874 #endif
 875
 876     /* Set the default idle timeout */
 877     l2cb.idle_timeout = L2CAP_LINK_INACTIVITY_TOUT;
 878
 879 #if defined(L2CAP_INITIAL_TRACE_LEVEL)
 880     l2cb.l2cap_trace_level = L2CAP_INITIAL_TRACE_LEVEL;
 881 #else
 882     l2cb.l2cap_trace_level = BT_TRACE_LEVEL_NONE;    /* No traces */
 883 #endif
 884
 885 #if L2CAP_CONFORMANCE_TESTING == TRUE
 886      /* Conformance testing needs a dynamic response */
 887     l2cb.test_info_resp = L2CAP_EXTFEA_SUPPORTED_MASK;
 888 #endif
 889
 890     /* Number of ACL buffers to use for high priority channel */
 891 #if (defined(L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE) && (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE))
 892     l2cb.high_pri_min_xmit_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA;
 893 #endif
 894
 895     l2cb.rcv_pending_q = list_new(NULL);
 896     if (l2cb.rcv_pending_q == NULL)
 897         LOG_ERROR("%s unable to allocate memory for link layer control block", __func__);
 898 }
 899
 900 void l2c_free(void) {
 901     list_free(l2cb.rcv_pending_q);
 902 }
 903
 904 /*******************************************************************************
 905 **
 906 ** Function         l2c_process_timeout
 907 **
 908 ** Description      This function is called when an L2CAP-related timeout occurs
 909 **
 910 ** Returns          void
 911 **
 912 *******************************************************************************/
 913 void l2c_process_timeout (TIMER_LIST_ENT *p_tle)
 914 {
 915     /* What type of timeout ? */
 916     switch (p_tle->event)
 917     {
 918     case BTU_TTYPE_L2CAP_LINK:
 919         l2c_link_timeout ((tL2C_LCB *)p_tle->param);
 920         break;
 921
 922     case BTU_TTYPE_L2CAP_CHNL:
 923         l2c_csm_execute (((tL2C_CCB *)p_tle->param), L2CEVT_TIMEOUT, NULL);
 924         break;
 925
 926     case BTU_TTYPE_L2CAP_FCR_ACK:
 927         l2c_csm_execute (((tL2C_CCB *)p_tle->param), L2CEVT_ACK_TIMEOUT, NULL);
 928         break;
 929
 930     case BTU_TTYPE_L2CAP_HOLD:
 931         /* Update the timeouts in the hold queue */
 932         l2c_process_held_packets(TRUE);
 933         break;
 934
 935     case BTU_TTYPE_L2CAP_INFO:
 936         l2c_info_timeout((tL2C_LCB *)p_tle->param);
 937         break;
 938     }
 939 }
 940
 941 /*******************************************************************************
 942 **
 943 ** Function         l2c_data_write
 944 **
 945 ** Description      API functions call this function to write data.
 946 **
 947 ** Returns          L2CAP_DW_SUCCESS, if data accepted, else FALSE
 948 **                  L2CAP_DW_CONGESTED, if data accepted and the channel is congested
 949 **                  L2CAP_DW_FAILED, if error
 950 **
 951 *******************************************************************************/
 952 UINT8 l2c_data_write (UINT16 cid, BT_HDR *p_data, UINT16 flags)
 953 {
 954     tL2C_CCB        *p_ccb;
 955
 956     /* Find the channel control block. We don't know the link it is on. */
 957     if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL)
 958     {
 959         L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_DataWrite, CID: %d", cid);
 960         GKI_freebuf (p_data);
 961         return (L2CAP_DW_FAILED);
 962     }
 963
 964 #ifndef TESTER /* Tester may send any amount of data. otherwise sending message
 965                   bigger than mtu size of peer is a violation of protocol */
 966     if (p_data->len > p_ccb->peer_cfg.mtu)
 967     {
 968         L2CAP_TRACE_WARNING ("L2CAP - CID: 0x%04x  cannot send message bigger than peer's mtu size", cid);
 969         GKI_freebuf (p_data);
 970         return (L2CAP_DW_FAILED);
 971     }
 972 #endif
 973
 974     /* channel based, packet based flushable or non-flushable */
 975     p_data->layer_specific = flags;
 976
 977     /* If already congested, do not accept any more packets */
 978     if (p_ccb->cong_sent)
 979     {
 980         L2CAP_TRACE_ERROR ("L2CAP - CID: 0x%04x cannot send, already congested  xmit_hold_q.count: %u  buff_quota: %u",
 981                             p_ccb->local_cid, GKI_queue_length(&p_ccb->xmit_hold_q), p_ccb->buff_quota);
 982
 983         GKI_freebuf (p_data);
 984         return (L2CAP_DW_FAILED);
 985     }
 986
 987     counter_add("l2cap.dyn.tx.bytes", p_data->len);
 988     counter_add("l2cap.dyn.tx.pkts", 1);
 989
 990     l2c_csm_execute (p_ccb, L2CEVT_L2CA_DATA_WRITE, p_data);
 991
 992     if (p_ccb->cong_sent)
 993         return (L2CAP_DW_CONGESTED);
 994
 995     return (L2CAP_DW_SUCCESS);
 996 }
 997