1 /* 2 BlueZ - Bluetooth protocol stack for Linux 3 Copyright (C) 2000-2001 Qualcomm Incorporated 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> 5 Copyright (C) 2010 Google Inc. 6 7 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License version 2 as 11 published by the Free Software Foundation; 12 13 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 14 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 16 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 17 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 18 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 19 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 20 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 21 22 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 23 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 24 SOFTWARE IS DISCLAIMED. 25 */ 26 27 #ifndef __L2CAP_H 28 #define __L2CAP_H 29 30 #include <asm/unaligned.h> 31 32 /* L2CAP defaults */ 33 #define L2CAP_DEFAULT_MTU 672 34 #define L2CAP_DEFAULT_MIN_MTU 48 35 #define L2CAP_DEFAULT_FLUSH_TO 0xffff 36 #define L2CAP_DEFAULT_TX_WINDOW 63 37 #define L2CAP_DEFAULT_EXT_WINDOW 0x3FFF 38 #define L2CAP_DEFAULT_MAX_TX 3 39 #define L2CAP_DEFAULT_RETRANS_TO 2000 /* 2 seconds */ 40 #define L2CAP_DEFAULT_MONITOR_TO 12000 /* 12 seconds */ 41 #define L2CAP_DEFAULT_MAX_PDU_SIZE 1009 /* Sized for 3-DH5 packet */ 42 #define L2CAP_DEFAULT_ACK_TO 200 43 #define L2CAP_DEFAULT_MAX_SDU_SIZE 0xFFFF 44 #define L2CAP_DEFAULT_SDU_ITIME 0xFFFFFFFF 45 #define L2CAP_DEFAULT_ACC_LAT 0xFFFFFFFF 46 #define L2CAP_BREDR_MAX_PAYLOAD 1019 /* 3-DH5 packet */ 47 #define L2CAP_LE_MIN_MTU 23 48 49 #define L2CAP_DISC_TIMEOUT msecs_to_jiffies(100) 50 #define L2CAP_DISC_REJ_TIMEOUT msecs_to_jiffies(5000) 51 #define L2CAP_ENC_TIMEOUT msecs_to_jiffies(5000) 52 #define L2CAP_CONN_TIMEOUT msecs_to_jiffies(40000) 53 #define L2CAP_INFO_TIMEOUT msecs_to_jiffies(4000) 54 55 #define L2CAP_A2MP_DEFAULT_MTU 670 56 57 /* L2CAP socket address */ 58 struct sockaddr_l2 { 59 sa_family_t l2_family; 60 __le16 l2_psm; 61 bdaddr_t l2_bdaddr; 62 __le16 l2_cid; 63 __u8 l2_bdaddr_type; 64 }; 65 66 /* L2CAP socket options */ 67 #define L2CAP_OPTIONS 0x01 68 struct l2cap_options { 69 __u16 omtu; 70 __u16 imtu; 71 __u16 flush_to; 72 __u8 mode; 73 __u8 fcs; 74 __u8 max_tx; 75 __u16 txwin_size; 76 }; 77 78 #define L2CAP_CONNINFO 0x02 79 struct l2cap_conninfo { 80 __u16 hci_handle; 81 __u8 dev_class[3]; 82 }; 83 84 #define L2CAP_LM 0x03 85 #define L2CAP_LM_MASTER 0x0001 86 #define L2CAP_LM_AUTH 0x0002 87 #define L2CAP_LM_ENCRYPT 0x0004 88 #define L2CAP_LM_TRUSTED 0x0008 89 #define L2CAP_LM_RELIABLE 0x0010 90 #define L2CAP_LM_SECURE 0x0020 91 92 /* L2CAP command codes */ 93 #define L2CAP_COMMAND_REJ 0x01 94 #define L2CAP_CONN_REQ 0x02 95 #define L2CAP_CONN_RSP 0x03 96 #define L2CAP_CONF_REQ 0x04 97 #define L2CAP_CONF_RSP 0x05 98 #define L2CAP_DISCONN_REQ 0x06 99 #define L2CAP_DISCONN_RSP 0x07 100 #define L2CAP_ECHO_REQ 0x08 101 #define L2CAP_ECHO_RSP 0x09 102 #define L2CAP_INFO_REQ 0x0a 103 #define L2CAP_INFO_RSP 0x0b 104 #define L2CAP_CREATE_CHAN_REQ 0x0c 105 #define L2CAP_CREATE_CHAN_RSP 0x0d 106 #define L2CAP_MOVE_CHAN_REQ 0x0e 107 #define L2CAP_MOVE_CHAN_RSP 0x0f 108 #define L2CAP_MOVE_CHAN_CFM 0x10 109 #define L2CAP_MOVE_CHAN_CFM_RSP 0x11 110 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12 111 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13 112 113 /* L2CAP extended feature mask */ 114 #define L2CAP_FEAT_FLOWCTL 0x00000001 115 #define L2CAP_FEAT_RETRANS 0x00000002 116 #define L2CAP_FEAT_BIDIR_QOS 0x00000004 117 #define L2CAP_FEAT_ERTM 0x00000008 118 #define L2CAP_FEAT_STREAMING 0x00000010 119 #define L2CAP_FEAT_FCS 0x00000020 120 #define L2CAP_FEAT_EXT_FLOW 0x00000040 121 #define L2CAP_FEAT_FIXED_CHAN 0x00000080 122 #define L2CAP_FEAT_EXT_WINDOW 0x00000100 123 #define L2CAP_FEAT_UCD 0x00000200 124 125 /* L2CAP checksum option */ 126 #define L2CAP_FCS_NONE 0x00 127 #define L2CAP_FCS_CRC16 0x01 128 129 /* L2CAP fixed channels */ 130 #define L2CAP_FC_L2CAP 0x02 131 #define L2CAP_FC_A2MP 0x08 132 133 /* L2CAP Control Field bit masks */ 134 #define L2CAP_CTRL_SAR 0xC000 135 #define L2CAP_CTRL_REQSEQ 0x3F00 136 #define L2CAP_CTRL_TXSEQ 0x007E 137 #define L2CAP_CTRL_SUPERVISE 0x000C 138 139 #define L2CAP_CTRL_RETRANS 0x0080 140 #define L2CAP_CTRL_FINAL 0x0080 141 #define L2CAP_CTRL_POLL 0x0010 142 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */ 143 144 #define L2CAP_CTRL_TXSEQ_SHIFT 1 145 #define L2CAP_CTRL_SUPER_SHIFT 2 146 #define L2CAP_CTRL_POLL_SHIFT 4 147 #define L2CAP_CTRL_FINAL_SHIFT 7 148 #define L2CAP_CTRL_REQSEQ_SHIFT 8 149 #define L2CAP_CTRL_SAR_SHIFT 14 150 151 /* L2CAP Extended Control Field bit mask */ 152 #define L2CAP_EXT_CTRL_TXSEQ 0xFFFC0000 153 #define L2CAP_EXT_CTRL_SAR 0x00030000 154 #define L2CAP_EXT_CTRL_SUPERVISE 0x00030000 155 #define L2CAP_EXT_CTRL_REQSEQ 0x0000FFFC 156 157 #define L2CAP_EXT_CTRL_POLL 0x00040000 158 #define L2CAP_EXT_CTRL_FINAL 0x00000002 159 #define L2CAP_EXT_CTRL_FRAME_TYPE 0x00000001 /* I- or S-Frame */ 160 161 #define L2CAP_EXT_CTRL_FINAL_SHIFT 1 162 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT 2 163 #define L2CAP_EXT_CTRL_SAR_SHIFT 16 164 #define L2CAP_EXT_CTRL_SUPER_SHIFT 16 165 #define L2CAP_EXT_CTRL_POLL_SHIFT 18 166 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT 18 167 168 /* L2CAP Supervisory Function */ 169 #define L2CAP_SUPER_RR 0x00 170 #define L2CAP_SUPER_REJ 0x01 171 #define L2CAP_SUPER_RNR 0x02 172 #define L2CAP_SUPER_SREJ 0x03 173 174 /* L2CAP Segmentation and Reassembly */ 175 #define L2CAP_SAR_UNSEGMENTED 0x00 176 #define L2CAP_SAR_START 0x01 177 #define L2CAP_SAR_END 0x02 178 #define L2CAP_SAR_CONTINUE 0x03 179 180 /* L2CAP Command rej. reasons */ 181 #define L2CAP_REJ_NOT_UNDERSTOOD 0x0000 182 #define L2CAP_REJ_MTU_EXCEEDED 0x0001 183 #define L2CAP_REJ_INVALID_CID 0x0002 184 185 /* L2CAP structures */ 186 struct l2cap_hdr { 187 __le16 len; 188 __le16 cid; 189 } __packed; 190 #define L2CAP_HDR_SIZE 4 191 #define L2CAP_ENH_HDR_SIZE 6 192 #define L2CAP_EXT_HDR_SIZE 8 193 194 #define L2CAP_FCS_SIZE 2 195 #define L2CAP_SDULEN_SIZE 2 196 #define L2CAP_PSMLEN_SIZE 2 197 #define L2CAP_ENH_CTRL_SIZE 2 198 #define L2CAP_EXT_CTRL_SIZE 4 199 200 struct l2cap_cmd_hdr { 201 __u8 code; 202 __u8 ident; 203 __le16 len; 204 } __packed; 205 #define L2CAP_CMD_HDR_SIZE 4 206 207 struct l2cap_cmd_rej_unk { 208 __le16 reason; 209 } __packed; 210 211 struct l2cap_cmd_rej_mtu { 212 __le16 reason; 213 __le16 max_mtu; 214 } __packed; 215 216 struct l2cap_cmd_rej_cid { 217 __le16 reason; 218 __le16 scid; 219 __le16 dcid; 220 } __packed; 221 222 struct l2cap_conn_req { 223 __le16 psm; 224 __le16 scid; 225 } __packed; 226 227 struct l2cap_conn_rsp { 228 __le16 dcid; 229 __le16 scid; 230 __le16 result; 231 __le16 status; 232 } __packed; 233 234 /* protocol/service multiplexer (PSM) */ 235 #define L2CAP_PSM_SDP 0x0001 236 #define L2CAP_PSM_RFCOMM 0x0003 237 238 /* channel indentifier */ 239 #define L2CAP_CID_SIGNALING 0x0001 240 #define L2CAP_CID_CONN_LESS 0x0002 241 #define L2CAP_CID_A2MP 0x0003 242 #define L2CAP_CID_LE_DATA 0x0004 243 #define L2CAP_CID_LE_SIGNALING 0x0005 244 #define L2CAP_CID_SMP 0x0006 245 #define L2CAP_CID_DYN_START 0x0040 246 #define L2CAP_CID_DYN_END 0xffff 247 248 /* connect/create channel results */ 249 #define L2CAP_CR_SUCCESS 0x0000 250 #define L2CAP_CR_PEND 0x0001 251 #define L2CAP_CR_BAD_PSM 0x0002 252 #define L2CAP_CR_SEC_BLOCK 0x0003 253 #define L2CAP_CR_NO_MEM 0x0004 254 #define L2CAP_CR_BAD_AMP 0x0005 255 256 /* connect/create channel status */ 257 #define L2CAP_CS_NO_INFO 0x0000 258 #define L2CAP_CS_AUTHEN_PEND 0x0001 259 #define L2CAP_CS_AUTHOR_PEND 0x0002 260 261 struct l2cap_conf_req { 262 __le16 dcid; 263 __le16 flags; 264 __u8 data[0]; 265 } __packed; 266 267 struct l2cap_conf_rsp { 268 __le16 scid; 269 __le16 flags; 270 __le16 result; 271 __u8 data[0]; 272 } __packed; 273 274 #define L2CAP_CONF_SUCCESS 0x0000 275 #define L2CAP_CONF_UNACCEPT 0x0001 276 #define L2CAP_CONF_REJECT 0x0002 277 #define L2CAP_CONF_UNKNOWN 0x0003 278 #define L2CAP_CONF_PENDING 0x0004 279 #define L2CAP_CONF_EFS_REJECT 0x0005 280 281 /* configuration req/rsp continuation flag */ 282 #define L2CAP_CONF_FLAG_CONTINUATION 0x0001 283 284 struct l2cap_conf_opt { 285 __u8 type; 286 __u8 len; 287 __u8 val[0]; 288 } __packed; 289 #define L2CAP_CONF_OPT_SIZE 2 290 291 #define L2CAP_CONF_HINT 0x80 292 #define L2CAP_CONF_MASK 0x7f 293 294 #define L2CAP_CONF_MTU 0x01 295 #define L2CAP_CONF_FLUSH_TO 0x02 296 #define L2CAP_CONF_QOS 0x03 297 #define L2CAP_CONF_RFC 0x04 298 #define L2CAP_CONF_FCS 0x05 299 #define L2CAP_CONF_EFS 0x06 300 #define L2CAP_CONF_EWS 0x07 301 302 #define L2CAP_CONF_MAX_SIZE 22 303 304 struct l2cap_conf_rfc { 305 __u8 mode; 306 __u8 txwin_size; 307 __u8 max_transmit; 308 __le16 retrans_timeout; 309 __le16 monitor_timeout; 310 __le16 max_pdu_size; 311 } __packed; 312 313 #define L2CAP_MODE_BASIC 0x00 314 #define L2CAP_MODE_RETRANS 0x01 315 #define L2CAP_MODE_FLOWCTL 0x02 316 #define L2CAP_MODE_ERTM 0x03 317 #define L2CAP_MODE_STREAMING 0x04 318 319 struct l2cap_conf_efs { 320 __u8 id; 321 __u8 stype; 322 __le16 msdu; 323 __le32 sdu_itime; 324 __le32 acc_lat; 325 __le32 flush_to; 326 } __packed; 327 328 #define L2CAP_SERV_NOTRAFIC 0x00 329 #define L2CAP_SERV_BESTEFFORT 0x01 330 #define L2CAP_SERV_GUARANTEED 0x02 331 332 #define L2CAP_BESTEFFORT_ID 0x01 333 334 struct l2cap_disconn_req { 335 __le16 dcid; 336 __le16 scid; 337 } __packed; 338 339 struct l2cap_disconn_rsp { 340 __le16 dcid; 341 __le16 scid; 342 } __packed; 343 344 struct l2cap_info_req { 345 __le16 type; 346 } __packed; 347 348 struct l2cap_info_rsp { 349 __le16 type; 350 __le16 result; 351 __u8 data[0]; 352 } __packed; 353 354 struct l2cap_create_chan_req { 355 __le16 psm; 356 __le16 scid; 357 __u8 amp_id; 358 } __packed; 359 360 struct l2cap_create_chan_rsp { 361 __le16 dcid; 362 __le16 scid; 363 __le16 result; 364 __le16 status; 365 } __packed; 366 367 struct l2cap_move_chan_req { 368 __le16 icid; 369 __u8 dest_amp_id; 370 } __packed; 371 372 struct l2cap_move_chan_rsp { 373 __le16 icid; 374 __le16 result; 375 } __packed; 376 377 #define L2CAP_MR_SUCCESS 0x0000 378 #define L2CAP_MR_PEND 0x0001 379 #define L2CAP_MR_BAD_ID 0x0002 380 #define L2CAP_MR_SAME_ID 0x0003 381 #define L2CAP_MR_NOT_SUPP 0x0004 382 #define L2CAP_MR_COLLISION 0x0005 383 #define L2CAP_MR_NOT_ALLOWED 0x0006 384 385 struct l2cap_move_chan_cfm { 386 __le16 icid; 387 __le16 result; 388 } __packed; 389 390 #define L2CAP_MC_CONFIRMED 0x0000 391 #define L2CAP_MC_UNCONFIRMED 0x0001 392 393 struct l2cap_move_chan_cfm_rsp { 394 __le16 icid; 395 } __packed; 396 397 /* info type */ 398 #define L2CAP_IT_CL_MTU 0x0001 399 #define L2CAP_IT_FEAT_MASK 0x0002 400 #define L2CAP_IT_FIXED_CHAN 0x0003 401 402 /* info result */ 403 #define L2CAP_IR_SUCCESS 0x0000 404 #define L2CAP_IR_NOTSUPP 0x0001 405 406 struct l2cap_conn_param_update_req { 407 __le16 min; 408 __le16 max; 409 __le16 latency; 410 __le16 to_multiplier; 411 } __packed; 412 413 struct l2cap_conn_param_update_rsp { 414 __le16 result; 415 } __packed; 416 417 /* Connection Parameters result */ 418 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000 419 #define L2CAP_CONN_PARAM_REJECTED 0x0001 420 421 /* ----- L2CAP channels and connections ----- */ 422 struct l2cap_seq_list { 423 __u16 head; 424 __u16 tail; 425 __u16 mask; 426 __u16 *list; 427 }; 428 429 #define L2CAP_SEQ_LIST_CLEAR 0xFFFF 430 #define L2CAP_SEQ_LIST_TAIL 0x8000 431 432 struct l2cap_chan { 433 struct sock *sk; 434 435 struct l2cap_conn *conn; 436 437 __u8 state; 438 439 atomic_t refcnt; 440 441 __le16 psm; 442 __u16 dcid; 443 __u16 scid; 444 445 __u16 imtu; 446 __u16 omtu; 447 __u16 flush_to; 448 __u8 mode; 449 __u8 chan_type; 450 __u8 chan_policy; 451 452 __le16 sport; 453 454 __u8 sec_level; 455 456 __u8 ident; 457 458 __u8 conf_req[64]; 459 __u8 conf_len; 460 __u8 num_conf_req; 461 __u8 num_conf_rsp; 462 463 __u8 fcs; 464 465 __u16 tx_win; 466 __u16 tx_win_max; 467 __u16 ack_win; 468 __u8 max_tx; 469 __u16 retrans_timeout; 470 __u16 monitor_timeout; 471 __u16 mps; 472 473 __u8 tx_state; 474 __u8 rx_state; 475 476 unsigned long conf_state; 477 unsigned long conn_state; 478 unsigned long flags; 479 480 __u16 next_tx_seq; 481 __u16 expected_ack_seq; 482 __u16 expected_tx_seq; 483 __u16 buffer_seq; 484 __u16 srej_save_reqseq; 485 __u16 last_acked_seq; 486 __u16 frames_sent; 487 __u16 unacked_frames; 488 __u8 retry_count; 489 __u16 srej_queue_next; 490 __u16 sdu_len; 491 struct sk_buff *sdu; 492 struct sk_buff *sdu_last_frag; 493 494 __u16 remote_tx_win; 495 __u8 remote_max_tx; 496 __u16 remote_mps; 497 498 __u8 local_id; 499 __u8 local_stype; 500 __u16 local_msdu; 501 __u32 local_sdu_itime; 502 __u32 local_acc_lat; 503 __u32 local_flush_to; 504 505 __u8 remote_id; 506 __u8 remote_stype; 507 __u16 remote_msdu; 508 __u32 remote_sdu_itime; 509 __u32 remote_acc_lat; 510 __u32 remote_flush_to; 511 512 struct delayed_work chan_timer; 513 struct delayed_work retrans_timer; 514 struct delayed_work monitor_timer; 515 struct delayed_work ack_timer; 516 517 struct sk_buff *tx_send_head; 518 struct sk_buff_head tx_q; 519 struct sk_buff_head srej_q; 520 struct l2cap_seq_list srej_list; 521 struct l2cap_seq_list retrans_list; 522 523 struct list_head list; 524 struct list_head global_l; 525 526 void *data; 527 struct l2cap_ops *ops; 528 struct mutex lock; 529 }; 530 531 struct l2cap_ops { 532 char *name; 533 534 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan); 535 int (*recv) (struct l2cap_chan * chan, 536 struct sk_buff *skb); 537 void (*teardown) (struct l2cap_chan *chan, int err); 538 void (*close) (struct l2cap_chan *chan); 539 void (*state_change) (struct l2cap_chan *chan, 540 int state); 541 void (*ready) (struct l2cap_chan *chan); 542 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan, 543 unsigned long len, int nb); 544 }; 545 546 struct l2cap_conn { 547 struct hci_conn *hcon; 548 struct hci_chan *hchan; 549 550 bdaddr_t *dst; 551 bdaddr_t *src; 552 553 unsigned int mtu; 554 555 __u32 feat_mask; 556 __u8 fixed_chan_mask; 557 558 __u8 info_state; 559 __u8 info_ident; 560 561 struct delayed_work info_timer; 562 563 spinlock_t lock; 564 565 struct sk_buff *rx_skb; 566 __u32 rx_len; 567 __u8 tx_ident; 568 569 __u8 disc_reason; 570 571 struct delayed_work security_timer; 572 struct smp_chan *smp_chan; 573 574 struct list_head chan_l; 575 struct mutex chan_lock; 576 }; 577 578 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01 579 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04 580 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08 581 582 #define L2CAP_CHAN_RAW 1 583 #define L2CAP_CHAN_CONN_LESS 2 584 #define L2CAP_CHAN_CONN_ORIENTED 3 585 #define L2CAP_CHAN_CONN_FIX_A2MP 4 586 587 /* ----- L2CAP socket info ----- */ 588 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk) 589 590 struct l2cap_pinfo { 591 struct bt_sock bt; 592 struct l2cap_chan *chan; 593 struct sk_buff *rx_busy_skb; 594 }; 595 596 enum { 597 CONF_REQ_SENT, 598 CONF_INPUT_DONE, 599 CONF_OUTPUT_DONE, 600 CONF_MTU_DONE, 601 CONF_MODE_DONE, 602 CONF_CONNECT_PEND, 603 CONF_NO_FCS_RECV, 604 CONF_STATE2_DEVICE, 605 CONF_EWS_RECV, 606 CONF_LOC_CONF_PEND, 607 CONF_REM_CONF_PEND, 608 CONF_NOT_COMPLETE, 609 }; 610 611 #define L2CAP_CONF_MAX_CONF_REQ 2 612 #define L2CAP_CONF_MAX_CONF_RSP 2 613 614 enum { 615 CONN_SREJ_SENT, 616 CONN_WAIT_F, 617 CONN_SREJ_ACT, 618 CONN_SEND_PBIT, 619 CONN_REMOTE_BUSY, 620 CONN_LOCAL_BUSY, 621 CONN_REJ_ACT, 622 CONN_SEND_FBIT, 623 CONN_RNR_SENT, 624 }; 625 626 /* Definitions for flags in l2cap_chan */ 627 enum { 628 FLAG_ROLE_SWITCH, 629 FLAG_FORCE_ACTIVE, 630 FLAG_FORCE_RELIABLE, 631 FLAG_FLUSHABLE, 632 FLAG_EXT_CTRL, 633 FLAG_EFS_ENABLE, 634 }; 635 636 enum { 637 L2CAP_TX_STATE_XMIT, 638 L2CAP_TX_STATE_WAIT_F, 639 }; 640 641 enum { 642 L2CAP_RX_STATE_RECV, 643 L2CAP_RX_STATE_SREJ_SENT, 644 }; 645 646 enum { 647 L2CAP_TXSEQ_EXPECTED, 648 L2CAP_TXSEQ_EXPECTED_SREJ, 649 L2CAP_TXSEQ_UNEXPECTED, 650 L2CAP_TXSEQ_UNEXPECTED_SREJ, 651 L2CAP_TXSEQ_DUPLICATE, 652 L2CAP_TXSEQ_DUPLICATE_SREJ, 653 L2CAP_TXSEQ_INVALID, 654 L2CAP_TXSEQ_INVALID_IGNORE, 655 }; 656 657 enum { 658 L2CAP_EV_DATA_REQUEST, 659 L2CAP_EV_LOCAL_BUSY_DETECTED, 660 L2CAP_EV_LOCAL_BUSY_CLEAR, 661 L2CAP_EV_RECV_REQSEQ_AND_FBIT, 662 L2CAP_EV_RECV_FBIT, 663 L2CAP_EV_RETRANS_TO, 664 L2CAP_EV_MONITOR_TO, 665 L2CAP_EV_EXPLICIT_POLL, 666 L2CAP_EV_RECV_IFRAME, 667 L2CAP_EV_RECV_RR, 668 L2CAP_EV_RECV_REJ, 669 L2CAP_EV_RECV_RNR, 670 L2CAP_EV_RECV_SREJ, 671 L2CAP_EV_RECV_FRAME, 672 }; 673 674 static inline void l2cap_chan_hold(struct l2cap_chan *c) 675 { 676 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->refcnt)); 677 678 atomic_inc(&c->refcnt); 679 } 680 681 static inline void l2cap_chan_put(struct l2cap_chan *c) 682 { 683 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->refcnt)); 684 685 if (atomic_dec_and_test(&c->refcnt)) 686 kfree(c); 687 } 688 689 static inline void l2cap_chan_lock(struct l2cap_chan *chan) 690 { 691 mutex_lock(&chan->lock); 692 } 693 694 static inline void l2cap_chan_unlock(struct l2cap_chan *chan) 695 { 696 mutex_unlock(&chan->lock); 697 } 698 699 static inline void l2cap_set_timer(struct l2cap_chan *chan, 700 struct delayed_work *work, long timeout) 701 { 702 BT_DBG("chan %p state %s timeout %ld", chan, 703 state_to_string(chan->state), timeout); 704 705 /* If delayed work cancelled do not hold(chan) 706 since it is already done with previous set_timer */ 707 if (!cancel_delayed_work(work)) 708 l2cap_chan_hold(chan); 709 710 schedule_delayed_work(work, timeout); 711 } 712 713 static inline bool l2cap_clear_timer(struct l2cap_chan *chan, 714 struct delayed_work *work) 715 { 716 bool ret; 717 718 /* put(chan) if delayed work cancelled otherwise it 719 is done in delayed work function */ 720 ret = cancel_delayed_work(work); 721 if (ret) 722 l2cap_chan_put(chan); 723 724 return ret; 725 } 726 727 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t)) 728 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer) 729 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer) 730 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer) 731 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \ 732 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO)); 733 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer) 734 735 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2) 736 { 737 if (seq1 >= seq2) 738 return seq1 - seq2; 739 else 740 return chan->tx_win_max + 1 - seq2 + seq1; 741 } 742 743 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq) 744 { 745 return (seq + 1) % (chan->tx_win_max + 1); 746 } 747 748 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan) 749 { 750 return NULL; 751 } 752 753 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err) 754 { 755 } 756 757 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan) 758 { 759 } 760 761 extern bool disable_ertm; 762 763 int l2cap_init_sockets(void); 764 void l2cap_cleanup_sockets(void); 765 766 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan); 767 int __l2cap_wait_ack(struct sock *sk); 768 769 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm); 770 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid); 771 772 struct l2cap_chan *l2cap_chan_create(void); 773 void l2cap_chan_close(struct l2cap_chan *chan, int reason); 774 void l2cap_chan_destroy(struct l2cap_chan *chan); 775 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, 776 bdaddr_t *dst, u8 dst_type); 777 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, 778 u32 priority); 779 void l2cap_chan_busy(struct l2cap_chan *chan, int busy); 780 int l2cap_chan_check_security(struct l2cap_chan *chan); 781 void l2cap_chan_set_defaults(struct l2cap_chan *chan); 782 int l2cap_ertm_init(struct l2cap_chan *chan); 783 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan); 784 void l2cap_chan_del(struct l2cap_chan *chan, int err); 785 786 #endif /* __L2CAP_H */ 787