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 /********************************************************************************/
41 static 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
47 tL2C_CB l2cb;
48 #endif
49
50 /* Temporary - until l2cap implements group management */
51 #if (TCS_BCST_SETUP_INCLUDED == TRUE && TCS_INCLUDED == TRUE)
52 extern 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 *******************************************************************************/
l2c_bcst_msg(BT_HDR * p_buf,UINT16 psm)63 void 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_ERROR1 ("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 *******************************************************************************/
l2c_rcv_acl_data(BT_HDR * p_msg)119 void 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_WARNING5 ("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_ERROR5 ("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_WARNING1 ("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_WARNING1 ("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_WARNING0 ("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_WARNING2 ("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_DEBUG1( "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 (l2cu_initialize_fixed_ccb (p_lcb, rcv_cid, &l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts))
271 {
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 if (p_ccb == NULL)
287 GKI_freebuf (p_msg);
288 else
289 {
290 /* Basic mode packets go straight to the state machine */
291 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE)
292 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_msg);
293 else
294 {
295 /* eRTM or streaming mode, so we need to validate states first */
296 if ((p_ccb->chnl_state == CST_OPEN) || (p_ccb->chnl_state == CST_CONFIG))
297 l2c_fcr_proc_pdu (p_ccb, p_msg);
298 else
299 GKI_freebuf (p_msg);
300 }
301 }
302 }
303 }
304
305 /*******************************************************************************
306 **
307 ** Function process_l2cap_cmd
308 **
309 ** Description This function is called when a packet is received on the
310 ** L2CAP signalling CID
311 **
312 ** Returns void
313 **
314 *******************************************************************************/
process_l2cap_cmd(tL2C_LCB * p_lcb,UINT8 * p,UINT16 pkt_len)315 static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len)
316 {
317 UINT8 *p_pkt_end, *p_next_cmd, *p_cfg_end, *p_cfg_start;
318 UINT8 cmd_code, cfg_code, cfg_len, id;
319 tL2C_CONN_INFO con_info;
320 tL2CAP_CFG_INFO cfg_info;
321 UINT16 rej_reason, rej_mtu, lcid, rcid, info_type;
322 tL2C_CCB *p_ccb;
323 tL2C_RCB *p_rcb;
324 BOOLEAN cfg_rej;
325 UINT16 cfg_rej_len, cmd_len;
326 UINT16 result;
327 tL2C_CONN_INFO ci;
328
329 #if (defined BLE_INCLUDED && BLE_INCLUDED == TRUE)
330 /* if l2cap command received in CID 1 on top of an LE link, ignore this command */
331 if (p_lcb->is_ble_link)
332 return;
333 #endif
334 p_next_cmd = p;
335 p_pkt_end = p + pkt_len;
336
337 memset (&cfg_info, 0, sizeof(cfg_info));
338
339 /* An L2CAP packet may contain multiple commands */
340 while (TRUE)
341 {
342 /* Smallest command is 4 bytes */
343 if ((p = p_next_cmd) > (p_pkt_end - 4))
344 break;
345
346 STREAM_TO_UINT8 (cmd_code, p);
347 STREAM_TO_UINT8 (id, p);
348 STREAM_TO_UINT16 (cmd_len, p);
349
350 /* Check command length does not exceed packet length */
351 if ((p_next_cmd = p + cmd_len) > p_pkt_end)
352 {
353 L2CAP_TRACE_WARNING3 ("Command len bad pkt_len: %d cmd_len: %d code: %d",
354 pkt_len, cmd_len, cmd_code);
355 break;
356 }
357
358 switch (cmd_code)
359 {
360 case L2CAP_CMD_REJECT:
361 STREAM_TO_UINT16 (rej_reason, p);
362 if (rej_reason == L2CAP_CMD_REJ_MTU_EXCEEDED)
363 {
364 STREAM_TO_UINT16 (rej_mtu, p);
365 /* What to do with the MTU reject ? We have negotiated an MTU. For now */
366 /* we will ignore it and let a higher protocol timeout take care of it */
367
368 L2CAP_TRACE_WARNING2 ("L2CAP - MTU rej Handle: %d MTU: %d", p_lcb->handle, rej_mtu);
369 }
370 if (rej_reason == L2CAP_CMD_REJ_INVALID_CID)
371 {
372 STREAM_TO_UINT16 (rcid, p);
373 STREAM_TO_UINT16 (lcid, p);
374
375 L2CAP_TRACE_WARNING2 ("L2CAP - rej with CID invalid, LCID: 0x%04x RCID: 0x%04x", lcid, rcid);
376
377 /* Remote CID invalid. Treat as a disconnect */
378 if (((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
379 && (p_ccb->remote_cid == rcid))
380 {
381 /* Fake link disconnect - no reply is generated */
382 l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
383 }
384 }
385
386 /* SonyEricsson Info request Bug workaround (Continue connection) */
387 else if (rej_reason == L2CAP_CMD_REJ_NOT_UNDERSTOOD && p_lcb->w4_info_rsp)
388 {
389 btu_stop_timer (&p_lcb->info_timer_entry);
390
391 p_lcb->w4_info_rsp = FALSE;
392 ci.status = HCI_SUCCESS;
393 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
394
395 /* For all channels, send the event through their FSMs */
396 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
397 {
398 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
399 }
400 }
401 break;
402
403 case L2CAP_CMD_CONN_REQ:
404 STREAM_TO_UINT16 (con_info.psm, p);
405 STREAM_TO_UINT16 (rcid, p);
406 if ((p_rcb = l2cu_find_rcb_by_psm (con_info.psm)) == NULL)
407 {
408 L2CAP_TRACE_WARNING1 ("L2CAP - rcvd conn req for unknown PSM: %d", con_info.psm);
409 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
410 break;
411 }
412 else
413 {
414 if (!p_rcb->api.pL2CA_ConnectInd_Cb)
415 {
416 L2CAP_TRACE_WARNING1 ("L2CAP - rcvd conn req for outgoing-only connection PSM: %d", con_info.psm);
417 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
418 break;
419 }
420 }
421 if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL)
422 {
423 L2CAP_TRACE_ERROR0 ("L2CAP - unable to allocate CCB");
424 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_RESOURCES);
425 break;
426 }
427 p_ccb->remote_id = id;
428 p_ccb->p_rcb = p_rcb;
429 p_ccb->remote_cid = rcid;
430
431 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_REQ, &con_info);
432 break;
433
434 case L2CAP_CMD_CONN_RSP:
435 STREAM_TO_UINT16 (con_info.remote_cid, p);
436 STREAM_TO_UINT16 (lcid, p);
437 STREAM_TO_UINT16 (con_info.l2cap_result, p);
438 STREAM_TO_UINT16 (con_info.l2cap_status, p);
439
440 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) == NULL)
441 {
442 L2CAP_TRACE_WARNING2 ("L2CAP - no CCB for conn rsp, LCID: %d RCID: %d",
443 lcid, con_info.remote_cid);
444 break;
445 }
446 if (p_ccb->local_id != id)
447 {
448 L2CAP_TRACE_WARNING2 ("L2CAP - con rsp - bad ID. Exp: %d Got: %d",
449 p_ccb->local_id, id);
450 break;
451 }
452
453 if (con_info.l2cap_result == L2CAP_CONN_OK)
454 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP, &con_info);
455 else if (con_info.l2cap_result == L2CAP_CONN_PENDING)
456 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_PND, &con_info);
457 else
458 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
459
460 break;
461
462 case L2CAP_CMD_CONFIG_REQ:
463 p_cfg_end = p + cmd_len;
464 cfg_rej = FALSE;
465 cfg_rej_len = 0;
466
467 STREAM_TO_UINT16 (lcid, p);
468 STREAM_TO_UINT16 (cfg_info.flags, p);
469
470 p_cfg_start = p;
471
472 cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
473 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
474
475 while (p < p_cfg_end)
476 {
477 STREAM_TO_UINT8 (cfg_code, p);
478 STREAM_TO_UINT8 (cfg_len, p);
479
480 switch (cfg_code & 0x7F)
481 {
482 case L2CAP_CFG_TYPE_MTU:
483 cfg_info.mtu_present = TRUE;
484 STREAM_TO_UINT16 (cfg_info.mtu, p);
485 break;
486
487 case L2CAP_CFG_TYPE_FLUSH_TOUT:
488 cfg_info.flush_to_present = TRUE;
489 STREAM_TO_UINT16 (cfg_info.flush_to, p);
490 break;
491
492 case L2CAP_CFG_TYPE_QOS:
493 cfg_info.qos_present = TRUE;
494 STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p);
495 STREAM_TO_UINT8 (cfg_info.qos.service_type, p);
496 STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
497 STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
498 STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
499 STREAM_TO_UINT32 (cfg_info.qos.latency, p);
500 STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
501 break;
502
503 case L2CAP_CFG_TYPE_FCR:
504 cfg_info.fcr_present = TRUE;
505 STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
506 STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
507 STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
508 STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
509 STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
510 STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
511 break;
512
513 case L2CAP_CFG_TYPE_FCS:
514 cfg_info.fcs_present = TRUE;
515 STREAM_TO_UINT8 (cfg_info.fcs, p);
516 break;
517
518 case L2CAP_CFG_TYPE_EXT_FLOW:
519 cfg_info.ext_flow_spec_present = TRUE;
520 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p);
521 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p);
522 STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
523 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
524 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
525 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
526 break;
527
528 default:
529 /* sanity check option length */
530 if ((cfg_len + L2CAP_CFG_OPTION_OVERHEAD) <= cmd_len)
531 {
532 p += cfg_len;
533 if ((cfg_code & 0x80) == 0)
534 {
535 cfg_rej_len += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
536 cfg_rej = TRUE;
537 }
538 }
539 /* bad length; force loop exit */
540 else
541 {
542 p = p_cfg_end;
543 cfg_rej = TRUE;
544 }
545 break;
546 }
547 }
548
549 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
550 {
551 p_ccb->remote_id = id;
552 if (cfg_rej)
553 {
554 l2cu_send_peer_config_rej (p_ccb, p_cfg_start, (UINT16) (cmd_len - L2CAP_CONFIG_REQ_LEN), cfg_rej_len);
555 }
556 else
557 {
558 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_REQ, &cfg_info);
559 }
560 }
561 else
562 {
563 /* updated spec says send command reject on invalid cid */
564 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_INVALID_CID, id, 0, 0);
565 }
566 break;
567
568 case L2CAP_CMD_CONFIG_RSP:
569 p_cfg_end = p + cmd_len;
570 STREAM_TO_UINT16 (lcid, p);
571 STREAM_TO_UINT16 (cfg_info.flags, p);
572 STREAM_TO_UINT16 (cfg_info.result, p);
573
574 cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
575 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
576
577 while (p < p_cfg_end)
578 {
579 STREAM_TO_UINT8 (cfg_code, p);
580 STREAM_TO_UINT8 (cfg_len, p);
581
582 switch (cfg_code & 0x7F)
583 {
584 case L2CAP_CFG_TYPE_MTU:
585 cfg_info.mtu_present = TRUE;
586 STREAM_TO_UINT16 (cfg_info.mtu, p);
587 break;
588
589 case L2CAP_CFG_TYPE_FLUSH_TOUT:
590 cfg_info.flush_to_present = TRUE;
591 STREAM_TO_UINT16 (cfg_info.flush_to, p);
592 break;
593
594 case L2CAP_CFG_TYPE_QOS:
595 cfg_info.qos_present = TRUE;
596 STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p);
597 STREAM_TO_UINT8 (cfg_info.qos.service_type, p);
598 STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
599 STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
600 STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
601 STREAM_TO_UINT32 (cfg_info.qos.latency, p);
602 STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
603 break;
604
605 case L2CAP_CFG_TYPE_FCR:
606 cfg_info.fcr_present = TRUE;
607 STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
608 STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
609 STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
610 STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
611 STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
612 STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
613 break;
614
615 case L2CAP_CFG_TYPE_FCS:
616 cfg_info.fcs_present = TRUE;
617 STREAM_TO_UINT8 (cfg_info.fcs, p);
618 break;
619
620 case L2CAP_CFG_TYPE_EXT_FLOW:
621 cfg_info.ext_flow_spec_present = TRUE;
622 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p);
623 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p);
624 STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
625 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
626 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
627 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
628 break;
629 }
630 }
631
632 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
633 {
634 if (p_ccb->local_id != id)
635 {
636 L2CAP_TRACE_WARNING2 ("L2CAP - cfg rsp - bad ID. Exp: %d Got: %d",
637 p_ccb->local_id, id);
638 break;
639 }
640 if ( (cfg_info.result == L2CAP_CFG_OK) || (cfg_info.result == L2CAP_CFG_PENDING) )
641 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP, &cfg_info);
642 else
643 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP_NEG, &cfg_info);
644 }
645 else
646 {
647 L2CAP_TRACE_WARNING1 ("L2CAP - rcvd cfg rsp for unknown CID: 0x%04x", lcid);
648 }
649 break;
650
651
652 case L2CAP_CMD_DISC_REQ:
653 STREAM_TO_UINT16 (lcid, p);
654 STREAM_TO_UINT16 (rcid, p);
655
656 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
657 {
658 if (p_ccb->remote_cid == rcid)
659 {
660 p_ccb->remote_id = id;
661 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_REQ, &con_info);
662 }
663 }
664 else
665 l2cu_send_peer_disc_rsp (p_lcb, id, lcid, rcid);
666
667 break;
668
669 case L2CAP_CMD_DISC_RSP:
670 STREAM_TO_UINT16 (rcid, p);
671 STREAM_TO_UINT16 (lcid, p);
672
673 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
674 {
675 if ((p_ccb->remote_cid == rcid) && (p_ccb->local_id == id))
676 {
677 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_RSP, &con_info);
678 }
679 }
680 break;
681
682 case L2CAP_CMD_ECHO_REQ:
683 l2cu_send_peer_echo_rsp (p_lcb, id, NULL, 0);
684 break;
685
686 case L2CAP_CMD_ECHO_RSP:
687 if (p_lcb->p_echo_rsp_cb)
688 {
689 tL2CA_ECHO_RSP_CB *p_cb = p_lcb->p_echo_rsp_cb;
690
691 /* Zero out the callback in case app immediately calls us again */
692 p_lcb->p_echo_rsp_cb = NULL;
693
694 (*p_cb) (L2CAP_PING_RESULT_OK);
695 }
696 break;
697
698 case L2CAP_CMD_INFO_REQ:
699 STREAM_TO_UINT16 (info_type, p);
700 l2cu_send_peer_info_rsp (p_lcb, id, info_type);
701 break;
702
703 case L2CAP_CMD_INFO_RSP:
704 /* Stop the link connect timer if sent before L2CAP connection is up */
705 if (p_lcb->w4_info_rsp)
706 {
707 btu_stop_timer (&p_lcb->info_timer_entry);
708 p_lcb->w4_info_rsp = FALSE;
709 }
710
711 STREAM_TO_UINT16 (info_type, p);
712 STREAM_TO_UINT16 (result, p);
713
714 p_lcb->info_rx_bits |= (1 << info_type);
715
716 if ( (info_type == L2CAP_EXTENDED_FEATURES_INFO_TYPE)
717 && (result == L2CAP_INFO_RESP_RESULT_SUCCESS) )
718 {
719 STREAM_TO_UINT32( p_lcb->peer_ext_fea, p );
720
721 #if (L2CAP_NUM_FIXED_CHNLS > 0)
722 if (p_lcb->peer_ext_fea & L2CAP_EXTFEA_FIXED_CHNLS)
723 {
724 l2cu_send_peer_info_req (p_lcb, L2CAP_FIXED_CHANNELS_INFO_TYPE);
725 break;
726 }
727 else
728 {
729 l2cu_process_fixed_chnl_resp (p_lcb);
730 }
731 #endif
732 }
733
734
735 #if (L2CAP_NUM_FIXED_CHNLS > 0)
736 if (info_type == L2CAP_FIXED_CHANNELS_INFO_TYPE)
737 {
738 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
739 {
740 memcpy (p_lcb->peer_chnl_mask, p, L2CAP_FIXED_CHNL_ARRAY_SIZE);
741 }
742
743 l2cu_process_fixed_chnl_resp (p_lcb);
744 }
745 #endif
746 #if (L2CAP_UCD_INCLUDED == TRUE)
747 else if (info_type == L2CAP_CONNLESS_MTU_INFO_TYPE)
748 {
749 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
750 {
751 STREAM_TO_UINT16 (p_lcb->ucd_mtu, p);
752 }
753 }
754 #endif
755
756 ci.status = HCI_SUCCESS;
757 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
758 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
759 {
760 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
761 }
762 break;
763
764 default:
765 L2CAP_TRACE_WARNING1 ("L2CAP - bad cmd code: %d", cmd_code);
766 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0, 0);
767 return;
768 }
769 }
770 }
771
772 /*******************************************************************************
773 **
774 ** Function l2c_process_held_packets
775 **
776 ** Description This function processes any L2CAP packets that arrived before
777 ** the HCI connection complete arrived. It is a work around for
778 ** badly behaved controllers.
779 **
780 ** Returns void
781 **
782 *******************************************************************************/
l2c_process_held_packets(BOOLEAN timed_out)783 void l2c_process_held_packets (BOOLEAN timed_out)
784 {
785 BT_HDR *p_buf, *p_buf1;
786 BUFFER_Q *p_rcv_hold_q = &l2cb.rcv_hold_q;
787
788 if (!p_rcv_hold_q->count)
789 return;
790
791 if (!timed_out)
792 {
793 btu_stop_timer(&l2cb.rcv_hold_tle);
794 L2CAP_TRACE_WARNING0("L2CAP HOLD CONTINUE");
795 }
796 else
797 {
798 L2CAP_TRACE_WARNING0("L2CAP HOLD TIMEOUT");
799 }
800
801 /* Update the timeouts in the hold queue */
802 for (p_buf = (BT_HDR *)GKI_getfirst (p_rcv_hold_q); p_buf; p_buf = p_buf1)
803 {
804 p_buf1 = (BT_HDR *)GKI_getnext (p_buf);
805 if (!timed_out || (!p_buf->layer_specific) || (--p_buf->layer_specific == 0))
806 {
807 GKI_remove_from_queue (p_rcv_hold_q, p_buf);
808 p_buf->layer_specific = 0xFFFF;
809 l2c_rcv_acl_data (p_buf);
810 }
811 }
812
813 /* If anyone still in the queue, restart the timeout */
814 if (p_rcv_hold_q->count)
815 btu_start_timer (&l2cb.rcv_hold_tle, BTU_TTYPE_L2CAP_HOLD, BT_1SEC_TIMEOUT);
816 }
817
818
819 /*******************************************************************************
820 **
821 ** Function l2c_init
822 **
823 ** Description This function is called once at startup to initialize
824 ** all the L2CAP structures
825 **
826 ** Returns void
827 **
828 *******************************************************************************/
l2c_init(void)829 void l2c_init (void)
830 {
831 INT16 xx;
832
833 memset (&l2cb, 0, sizeof (tL2C_CB));
834 /* the psm is increased by 2 before being used */
835 l2cb.dyn_psm = 0xFFF;
836
837 /* Put all the channel control blocks on the free queue */
838 for (xx = 0; xx < MAX_L2CAP_CHANNELS - 1; xx++)
839 {
840 l2cb.ccb_pool[xx].p_next_ccb = &l2cb.ccb_pool[xx + 1];
841 }
842
843 #if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
844 /* it will be set to L2CAP_PKT_START_NON_FLUSHABLE if controller supports */
845 l2cb.non_flushable_pbf = L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT;
846 #endif
847
848
849 l2cb.p_free_ccb_first = &l2cb.ccb_pool[0];
850 l2cb.p_free_ccb_last = &l2cb.ccb_pool[MAX_L2CAP_CHANNELS - 1];
851
852 #ifdef L2CAP_DESIRED_LINK_ROLE
853 l2cb.desire_role = L2CAP_DESIRED_LINK_ROLE;
854 #else
855 l2cb.desire_role = HCI_ROLE_SLAVE;
856 #endif
857
858 /* Set the default idle timeout */
859 l2cb.idle_timeout = L2CAP_LINK_INACTIVITY_TOUT;
860
861 #if defined(L2CAP_INITIAL_TRACE_LEVEL)
862 l2cb.l2cap_trace_level = L2CAP_INITIAL_TRACE_LEVEL;
863 #else
864 l2cb.l2cap_trace_level = BT_TRACE_LEVEL_NONE; /* No traces */
865 #endif
866
867 #if L2CAP_CONFORMANCE_TESTING == TRUE
868 /* Conformance testing needs a dynamic response */
869 l2cb.test_info_resp = L2CAP_EXTFEA_SUPPORTED_MASK;
870 #endif
871
872 /* Number of ACL buffers to use for high priority channel */
873 #if (defined(L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE) && (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE))
874 l2cb.high_pri_min_xmit_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA;
875 #endif
876
877 }
878
879 /*******************************************************************************
880 **
881 ** Function l2c_process_timeout
882 **
883 ** Description This function is called when an L2CAP-related timeout occurs
884 **
885 ** Returns void
886 **
887 *******************************************************************************/
l2c_process_timeout(TIMER_LIST_ENT * p_tle)888 void l2c_process_timeout (TIMER_LIST_ENT *p_tle)
889 {
890 /* What type of timeout ? */
891 switch (p_tle->event)
892 {
893 case BTU_TTYPE_L2CAP_LINK:
894 l2c_link_timeout ((tL2C_LCB *)p_tle->param);
895 break;
896
897 case BTU_TTYPE_L2CAP_CHNL:
898 l2c_csm_execute (((tL2C_CCB *)p_tle->param), L2CEVT_TIMEOUT, NULL);
899 break;
900
901 case BTU_TTYPE_L2CAP_FCR_ACK:
902 l2c_csm_execute (((tL2C_CCB *)p_tle->param), L2CEVT_ACK_TIMEOUT, NULL);
903 break;
904
905 case BTU_TTYPE_L2CAP_HOLD:
906 /* Update the timeouts in the hold queue */
907 l2c_process_held_packets(TRUE);
908 break;
909
910 case BTU_TTYPE_L2CAP_INFO:
911 l2c_info_timeout((tL2C_LCB *)p_tle->param);
912 break;
913
914 }
915 }
916
917 /*******************************************************************************
918 **
919 ** Function l2c_data_write
920 **
921 ** Description API functions call this function to write data.
922 **
923 ** Returns L2CAP_DW_SUCCESS, if data accepted, else FALSE
924 ** L2CAP_DW_CONGESTED, if data accepted and the channel is congested
925 ** L2CAP_DW_FAILED, if error
926 **
927 *******************************************************************************/
l2c_data_write(UINT16 cid,BT_HDR * p_data,UINT16 flags)928 UINT8 l2c_data_write (UINT16 cid, BT_HDR *p_data, UINT16 flags)
929 {
930 tL2C_CCB *p_ccb;
931
932 /* Find the channel control block. We don't know the link it is on. */
933 if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL)
934 {
935 L2CAP_TRACE_WARNING1 ("L2CAP - no CCB for L2CA_DataWrite, CID: %d", cid);
936 GKI_freebuf (p_data);
937 return (L2CAP_DW_FAILED);
938 }
939
940 #ifndef TESTER /* Tester may send any amount of data. otherwise sending message
941 bigger than mtu size of peer is a violation of protocol */
942 if (p_data->len > p_ccb->peer_cfg.mtu)
943 {
944 L2CAP_TRACE_WARNING1 ("L2CAP - CID: 0x%04x cannot send message bigger than peer's mtu size", cid);
945 GKI_freebuf (p_data);
946 return (L2CAP_DW_FAILED);
947 }
948 #endif
949
950 /* channel based, packet based flushable or non-flushable */
951 p_data->layer_specific = flags;
952
953 /* If already congested, do not accept any more packets */
954 if (p_ccb->cong_sent)
955 {
956 L2CAP_TRACE_ERROR3 ("L2CAP - CID: 0x%04x cannot send, already congested xmit_hold_q.count: %u buff_quota: %u",
957 p_ccb->local_cid, p_ccb->xmit_hold_q.count, p_ccb->buff_quota);
958
959 GKI_freebuf (p_data);
960 return (L2CAP_DW_FAILED);
961 }
962
963 l2c_csm_execute (p_ccb, L2CEVT_L2CA_DATA_WRITE, p_data);
964
965 if (p_ccb->cong_sent)
966 return (L2CAP_DW_CONGESTED);
967
968 return (L2CAP_DW_SUCCESS);
969 }
970
971