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 #include <linux/atomic.h> 32 33 /* L2CAP defaults */ 34 #define L2CAP_DEFAULT_MTU 672 35 #define L2CAP_DEFAULT_MIN_MTU 48 36 #define L2CAP_DEFAULT_FLUSH_TO 0xFFFF 37 #define L2CAP_EFS_DEFAULT_FLUSH_TO 0xFFFFFFFF 38 #define L2CAP_DEFAULT_TX_WINDOW 63 39 #define L2CAP_DEFAULT_EXT_WINDOW 0x3FFF 40 #define L2CAP_DEFAULT_MAX_TX 3 41 #define L2CAP_DEFAULT_RETRANS_TO 2000 /* 2 seconds */ 42 #define L2CAP_DEFAULT_MONITOR_TO 12000 /* 12 seconds */ 43 #define L2CAP_DEFAULT_MAX_PDU_SIZE 1492 /* Sized for AMP packet */ 44 #define L2CAP_DEFAULT_ACK_TO 200 45 #define L2CAP_DEFAULT_MAX_SDU_SIZE 0xFFFF 46 #define L2CAP_DEFAULT_SDU_ITIME 0xFFFFFFFF 47 #define L2CAP_DEFAULT_ACC_LAT 0xFFFFFFFF 48 #define L2CAP_BREDR_MAX_PAYLOAD 1019 /* 3-DH5 packet */ 49 #define L2CAP_LE_MIN_MTU 23 50 51 #define L2CAP_DISC_TIMEOUT msecs_to_jiffies(100) 52 #define L2CAP_DISC_REJ_TIMEOUT msecs_to_jiffies(5000) 53 #define L2CAP_ENC_TIMEOUT msecs_to_jiffies(5000) 54 #define L2CAP_CONN_TIMEOUT msecs_to_jiffies(40000) 55 #define L2CAP_INFO_TIMEOUT msecs_to_jiffies(4000) 56 #define L2CAP_MOVE_TIMEOUT msecs_to_jiffies(4000) 57 #define L2CAP_MOVE_ERTX_TIMEOUT msecs_to_jiffies(60000) 58 #define L2CAP_WAIT_ACK_POLL_PERIOD msecs_to_jiffies(200) 59 #define L2CAP_WAIT_ACK_TIMEOUT msecs_to_jiffies(10000) 60 61 #define L2CAP_A2MP_DEFAULT_MTU 670 62 63 /* L2CAP socket address */ 64 struct sockaddr_l2 { 65 sa_family_t l2_family; 66 __le16 l2_psm; 67 bdaddr_t l2_bdaddr; 68 __le16 l2_cid; 69 __u8 l2_bdaddr_type; 70 }; 71 72 /* L2CAP socket options */ 73 #define L2CAP_OPTIONS 0x01 74 struct l2cap_options { 75 __u16 omtu; 76 __u16 imtu; 77 __u16 flush_to; 78 __u8 mode; 79 __u8 fcs; 80 __u8 max_tx; 81 __u16 txwin_size; 82 }; 83 84 #define L2CAP_CONNINFO 0x02 85 struct l2cap_conninfo { 86 __u16 hci_handle; 87 __u8 dev_class[3]; 88 }; 89 90 #define L2CAP_LM 0x03 91 #define L2CAP_LM_MASTER 0x0001 92 #define L2CAP_LM_AUTH 0x0002 93 #define L2CAP_LM_ENCRYPT 0x0004 94 #define L2CAP_LM_TRUSTED 0x0008 95 #define L2CAP_LM_RELIABLE 0x0010 96 #define L2CAP_LM_SECURE 0x0020 97 #define L2CAP_LM_FIPS 0x0040 98 99 /* L2CAP command codes */ 100 #define L2CAP_COMMAND_REJ 0x01 101 #define L2CAP_CONN_REQ 0x02 102 #define L2CAP_CONN_RSP 0x03 103 #define L2CAP_CONF_REQ 0x04 104 #define L2CAP_CONF_RSP 0x05 105 #define L2CAP_DISCONN_REQ 0x06 106 #define L2CAP_DISCONN_RSP 0x07 107 #define L2CAP_ECHO_REQ 0x08 108 #define L2CAP_ECHO_RSP 0x09 109 #define L2CAP_INFO_REQ 0x0a 110 #define L2CAP_INFO_RSP 0x0b 111 #define L2CAP_CREATE_CHAN_REQ 0x0c 112 #define L2CAP_CREATE_CHAN_RSP 0x0d 113 #define L2CAP_MOVE_CHAN_REQ 0x0e 114 #define L2CAP_MOVE_CHAN_RSP 0x0f 115 #define L2CAP_MOVE_CHAN_CFM 0x10 116 #define L2CAP_MOVE_CHAN_CFM_RSP 0x11 117 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12 118 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13 119 #define L2CAP_LE_CONN_REQ 0x14 120 #define L2CAP_LE_CONN_RSP 0x15 121 #define L2CAP_LE_CREDITS 0x16 122 123 /* L2CAP extended feature mask */ 124 #define L2CAP_FEAT_FLOWCTL 0x00000001 125 #define L2CAP_FEAT_RETRANS 0x00000002 126 #define L2CAP_FEAT_BIDIR_QOS 0x00000004 127 #define L2CAP_FEAT_ERTM 0x00000008 128 #define L2CAP_FEAT_STREAMING 0x00000010 129 #define L2CAP_FEAT_FCS 0x00000020 130 #define L2CAP_FEAT_EXT_FLOW 0x00000040 131 #define L2CAP_FEAT_FIXED_CHAN 0x00000080 132 #define L2CAP_FEAT_EXT_WINDOW 0x00000100 133 #define L2CAP_FEAT_UCD 0x00000200 134 135 /* L2CAP checksum option */ 136 #define L2CAP_FCS_NONE 0x00 137 #define L2CAP_FCS_CRC16 0x01 138 139 /* L2CAP fixed channels */ 140 #define L2CAP_FC_SIG_BREDR 0x02 141 #define L2CAP_FC_CONNLESS 0x04 142 #define L2CAP_FC_A2MP 0x08 143 #define L2CAP_FC_ATT 0x10 144 #define L2CAP_FC_SIG_LE 0x20 145 #define L2CAP_FC_SMP_LE 0x40 146 #define L2CAP_FC_SMP_BREDR 0x80 147 148 /* L2CAP Control Field bit masks */ 149 #define L2CAP_CTRL_SAR 0xC000 150 #define L2CAP_CTRL_REQSEQ 0x3F00 151 #define L2CAP_CTRL_TXSEQ 0x007E 152 #define L2CAP_CTRL_SUPERVISE 0x000C 153 154 #define L2CAP_CTRL_RETRANS 0x0080 155 #define L2CAP_CTRL_FINAL 0x0080 156 #define L2CAP_CTRL_POLL 0x0010 157 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */ 158 159 #define L2CAP_CTRL_TXSEQ_SHIFT 1 160 #define L2CAP_CTRL_SUPER_SHIFT 2 161 #define L2CAP_CTRL_POLL_SHIFT 4 162 #define L2CAP_CTRL_FINAL_SHIFT 7 163 #define L2CAP_CTRL_REQSEQ_SHIFT 8 164 #define L2CAP_CTRL_SAR_SHIFT 14 165 166 /* L2CAP Extended Control Field bit mask */ 167 #define L2CAP_EXT_CTRL_TXSEQ 0xFFFC0000 168 #define L2CAP_EXT_CTRL_SAR 0x00030000 169 #define L2CAP_EXT_CTRL_SUPERVISE 0x00030000 170 #define L2CAP_EXT_CTRL_REQSEQ 0x0000FFFC 171 172 #define L2CAP_EXT_CTRL_POLL 0x00040000 173 #define L2CAP_EXT_CTRL_FINAL 0x00000002 174 #define L2CAP_EXT_CTRL_FRAME_TYPE 0x00000001 /* I- or S-Frame */ 175 176 #define L2CAP_EXT_CTRL_FINAL_SHIFT 1 177 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT 2 178 #define L2CAP_EXT_CTRL_SAR_SHIFT 16 179 #define L2CAP_EXT_CTRL_SUPER_SHIFT 16 180 #define L2CAP_EXT_CTRL_POLL_SHIFT 18 181 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT 18 182 183 /* L2CAP Supervisory Function */ 184 #define L2CAP_SUPER_RR 0x00 185 #define L2CAP_SUPER_REJ 0x01 186 #define L2CAP_SUPER_RNR 0x02 187 #define L2CAP_SUPER_SREJ 0x03 188 189 /* L2CAP Segmentation and Reassembly */ 190 #define L2CAP_SAR_UNSEGMENTED 0x00 191 #define L2CAP_SAR_START 0x01 192 #define L2CAP_SAR_END 0x02 193 #define L2CAP_SAR_CONTINUE 0x03 194 195 /* L2CAP Command rej. reasons */ 196 #define L2CAP_REJ_NOT_UNDERSTOOD 0x0000 197 #define L2CAP_REJ_MTU_EXCEEDED 0x0001 198 #define L2CAP_REJ_INVALID_CID 0x0002 199 200 /* L2CAP structures */ 201 struct l2cap_hdr { 202 __le16 len; 203 __le16 cid; 204 } __packed; 205 #define L2CAP_HDR_SIZE 4 206 #define L2CAP_ENH_HDR_SIZE 6 207 #define L2CAP_EXT_HDR_SIZE 8 208 209 #define L2CAP_FCS_SIZE 2 210 #define L2CAP_SDULEN_SIZE 2 211 #define L2CAP_PSMLEN_SIZE 2 212 #define L2CAP_ENH_CTRL_SIZE 2 213 #define L2CAP_EXT_CTRL_SIZE 4 214 215 struct l2cap_cmd_hdr { 216 __u8 code; 217 __u8 ident; 218 __le16 len; 219 } __packed; 220 #define L2CAP_CMD_HDR_SIZE 4 221 222 struct l2cap_cmd_rej_unk { 223 __le16 reason; 224 } __packed; 225 226 struct l2cap_cmd_rej_mtu { 227 __le16 reason; 228 __le16 max_mtu; 229 } __packed; 230 231 struct l2cap_cmd_rej_cid { 232 __le16 reason; 233 __le16 scid; 234 __le16 dcid; 235 } __packed; 236 237 struct l2cap_conn_req { 238 __le16 psm; 239 __le16 scid; 240 } __packed; 241 242 struct l2cap_conn_rsp { 243 __le16 dcid; 244 __le16 scid; 245 __le16 result; 246 __le16 status; 247 } __packed; 248 249 /* protocol/service multiplexer (PSM) */ 250 #define L2CAP_PSM_SDP 0x0001 251 #define L2CAP_PSM_RFCOMM 0x0003 252 #define L2CAP_PSM_3DSP 0x0021 253 #define L2CAP_PSM_IPSP 0x0023 /* 6LoWPAN */ 254 255 /* channel identifier */ 256 #define L2CAP_CID_SIGNALING 0x0001 257 #define L2CAP_CID_CONN_LESS 0x0002 258 #define L2CAP_CID_A2MP 0x0003 259 #define L2CAP_CID_ATT 0x0004 260 #define L2CAP_CID_LE_SIGNALING 0x0005 261 #define L2CAP_CID_SMP 0x0006 262 #define L2CAP_CID_SMP_BREDR 0x0007 263 #define L2CAP_CID_DYN_START 0x0040 264 #define L2CAP_CID_DYN_END 0xffff 265 #define L2CAP_CID_LE_DYN_END 0x007f 266 267 /* connect/create channel results */ 268 #define L2CAP_CR_SUCCESS 0x0000 269 #define L2CAP_CR_PEND 0x0001 270 #define L2CAP_CR_BAD_PSM 0x0002 271 #define L2CAP_CR_SEC_BLOCK 0x0003 272 #define L2CAP_CR_NO_MEM 0x0004 273 #define L2CAP_CR_BAD_AMP 0x0005 274 #define L2CAP_CR_AUTHENTICATION 0x0005 275 #define L2CAP_CR_AUTHORIZATION 0x0006 276 #define L2CAP_CR_BAD_KEY_SIZE 0x0007 277 #define L2CAP_CR_ENCRYPTION 0x0008 278 279 /* connect/create channel status */ 280 #define L2CAP_CS_NO_INFO 0x0000 281 #define L2CAP_CS_AUTHEN_PEND 0x0001 282 #define L2CAP_CS_AUTHOR_PEND 0x0002 283 284 struct l2cap_conf_req { 285 __le16 dcid; 286 __le16 flags; 287 __u8 data[0]; 288 } __packed; 289 290 struct l2cap_conf_rsp { 291 __le16 scid; 292 __le16 flags; 293 __le16 result; 294 __u8 data[0]; 295 } __packed; 296 297 #define L2CAP_CONF_SUCCESS 0x0000 298 #define L2CAP_CONF_UNACCEPT 0x0001 299 #define L2CAP_CONF_REJECT 0x0002 300 #define L2CAP_CONF_UNKNOWN 0x0003 301 #define L2CAP_CONF_PENDING 0x0004 302 #define L2CAP_CONF_EFS_REJECT 0x0005 303 304 /* configuration req/rsp continuation flag */ 305 #define L2CAP_CONF_FLAG_CONTINUATION 0x0001 306 307 struct l2cap_conf_opt { 308 __u8 type; 309 __u8 len; 310 __u8 val[0]; 311 } __packed; 312 #define L2CAP_CONF_OPT_SIZE 2 313 314 #define L2CAP_CONF_HINT 0x80 315 #define L2CAP_CONF_MASK 0x7f 316 317 #define L2CAP_CONF_MTU 0x01 318 #define L2CAP_CONF_FLUSH_TO 0x02 319 #define L2CAP_CONF_QOS 0x03 320 #define L2CAP_CONF_RFC 0x04 321 #define L2CAP_CONF_FCS 0x05 322 #define L2CAP_CONF_EFS 0x06 323 #define L2CAP_CONF_EWS 0x07 324 325 #define L2CAP_CONF_MAX_SIZE 22 326 327 struct l2cap_conf_rfc { 328 __u8 mode; 329 __u8 txwin_size; 330 __u8 max_transmit; 331 __le16 retrans_timeout; 332 __le16 monitor_timeout; 333 __le16 max_pdu_size; 334 } __packed; 335 336 #define L2CAP_MODE_BASIC 0x00 337 #define L2CAP_MODE_RETRANS 0x01 338 #define L2CAP_MODE_FLOWCTL 0x02 339 #define L2CAP_MODE_ERTM 0x03 340 #define L2CAP_MODE_STREAMING 0x04 341 342 /* Unlike the above this one doesn't actually map to anything that would 343 * ever be sent over the air. Therefore, use a value that's unlikely to 344 * ever be used in the BR/EDR configuration phase. 345 */ 346 #define L2CAP_MODE_LE_FLOWCTL 0x80 347 348 struct l2cap_conf_efs { 349 __u8 id; 350 __u8 stype; 351 __le16 msdu; 352 __le32 sdu_itime; 353 __le32 acc_lat; 354 __le32 flush_to; 355 } __packed; 356 357 #define L2CAP_SERV_NOTRAFIC 0x00 358 #define L2CAP_SERV_BESTEFFORT 0x01 359 #define L2CAP_SERV_GUARANTEED 0x02 360 361 #define L2CAP_BESTEFFORT_ID 0x01 362 363 struct l2cap_disconn_req { 364 __le16 dcid; 365 __le16 scid; 366 } __packed; 367 368 struct l2cap_disconn_rsp { 369 __le16 dcid; 370 __le16 scid; 371 } __packed; 372 373 struct l2cap_info_req { 374 __le16 type; 375 } __packed; 376 377 struct l2cap_info_rsp { 378 __le16 type; 379 __le16 result; 380 __u8 data[0]; 381 } __packed; 382 383 struct l2cap_create_chan_req { 384 __le16 psm; 385 __le16 scid; 386 __u8 amp_id; 387 } __packed; 388 389 struct l2cap_create_chan_rsp { 390 __le16 dcid; 391 __le16 scid; 392 __le16 result; 393 __le16 status; 394 } __packed; 395 396 struct l2cap_move_chan_req { 397 __le16 icid; 398 __u8 dest_amp_id; 399 } __packed; 400 401 struct l2cap_move_chan_rsp { 402 __le16 icid; 403 __le16 result; 404 } __packed; 405 406 #define L2CAP_MR_SUCCESS 0x0000 407 #define L2CAP_MR_PEND 0x0001 408 #define L2CAP_MR_BAD_ID 0x0002 409 #define L2CAP_MR_SAME_ID 0x0003 410 #define L2CAP_MR_NOT_SUPP 0x0004 411 #define L2CAP_MR_COLLISION 0x0005 412 #define L2CAP_MR_NOT_ALLOWED 0x0006 413 414 struct l2cap_move_chan_cfm { 415 __le16 icid; 416 __le16 result; 417 } __packed; 418 419 #define L2CAP_MC_CONFIRMED 0x0000 420 #define L2CAP_MC_UNCONFIRMED 0x0001 421 422 struct l2cap_move_chan_cfm_rsp { 423 __le16 icid; 424 } __packed; 425 426 /* info type */ 427 #define L2CAP_IT_CL_MTU 0x0001 428 #define L2CAP_IT_FEAT_MASK 0x0002 429 #define L2CAP_IT_FIXED_CHAN 0x0003 430 431 /* info result */ 432 #define L2CAP_IR_SUCCESS 0x0000 433 #define L2CAP_IR_NOTSUPP 0x0001 434 435 struct l2cap_conn_param_update_req { 436 __le16 min; 437 __le16 max; 438 __le16 latency; 439 __le16 to_multiplier; 440 } __packed; 441 442 struct l2cap_conn_param_update_rsp { 443 __le16 result; 444 } __packed; 445 446 /* Connection Parameters result */ 447 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000 448 #define L2CAP_CONN_PARAM_REJECTED 0x0001 449 450 #define L2CAP_LE_MAX_CREDITS 10 451 #define L2CAP_LE_DEFAULT_MPS 230 452 453 struct l2cap_le_conn_req { 454 __le16 psm; 455 __le16 scid; 456 __le16 mtu; 457 __le16 mps; 458 __le16 credits; 459 } __packed; 460 461 struct l2cap_le_conn_rsp { 462 __le16 dcid; 463 __le16 mtu; 464 __le16 mps; 465 __le16 credits; 466 __le16 result; 467 } __packed; 468 469 struct l2cap_le_credits { 470 __le16 cid; 471 __le16 credits; 472 } __packed; 473 474 /* ----- L2CAP channels and connections ----- */ 475 struct l2cap_seq_list { 476 __u16 head; 477 __u16 tail; 478 __u16 mask; 479 __u16 *list; 480 }; 481 482 #define L2CAP_SEQ_LIST_CLEAR 0xFFFF 483 #define L2CAP_SEQ_LIST_TAIL 0x8000 484 485 struct l2cap_chan { 486 struct l2cap_conn *conn; 487 struct hci_conn *hs_hcon; 488 struct hci_chan *hs_hchan; 489 struct kref kref; 490 atomic_t nesting; 491 492 __u8 state; 493 494 bdaddr_t dst; 495 __u8 dst_type; 496 bdaddr_t src; 497 __u8 src_type; 498 __le16 psm; 499 __le16 sport; 500 __u16 dcid; 501 __u16 scid; 502 503 __u16 imtu; 504 __u16 omtu; 505 __u16 flush_to; 506 __u8 mode; 507 __u8 chan_type; 508 __u8 chan_policy; 509 510 __u8 sec_level; 511 512 __u8 ident; 513 514 __u8 conf_req[64]; 515 __u8 conf_len; 516 __u8 num_conf_req; 517 __u8 num_conf_rsp; 518 519 __u8 fcs; 520 521 __u16 tx_win; 522 __u16 tx_win_max; 523 __u16 ack_win; 524 __u8 max_tx; 525 __u16 retrans_timeout; 526 __u16 monitor_timeout; 527 __u16 mps; 528 529 __u16 tx_credits; 530 __u16 rx_credits; 531 532 __u8 tx_state; 533 __u8 rx_state; 534 535 unsigned long conf_state; 536 unsigned long conn_state; 537 unsigned long flags; 538 539 __u8 remote_amp_id; 540 __u8 local_amp_id; 541 __u8 move_id; 542 __u8 move_state; 543 __u8 move_role; 544 545 __u16 next_tx_seq; 546 __u16 expected_ack_seq; 547 __u16 expected_tx_seq; 548 __u16 buffer_seq; 549 __u16 srej_save_reqseq; 550 __u16 last_acked_seq; 551 __u16 frames_sent; 552 __u16 unacked_frames; 553 __u8 retry_count; 554 __u16 sdu_len; 555 struct sk_buff *sdu; 556 struct sk_buff *sdu_last_frag; 557 558 __u16 remote_tx_win; 559 __u8 remote_max_tx; 560 __u16 remote_mps; 561 562 __u8 local_id; 563 __u8 local_stype; 564 __u16 local_msdu; 565 __u32 local_sdu_itime; 566 __u32 local_acc_lat; 567 __u32 local_flush_to; 568 569 __u8 remote_id; 570 __u8 remote_stype; 571 __u16 remote_msdu; 572 __u32 remote_sdu_itime; 573 __u32 remote_acc_lat; 574 __u32 remote_flush_to; 575 576 struct delayed_work chan_timer; 577 struct delayed_work retrans_timer; 578 struct delayed_work monitor_timer; 579 struct delayed_work ack_timer; 580 581 struct sk_buff *tx_send_head; 582 struct sk_buff_head tx_q; 583 struct sk_buff_head srej_q; 584 struct l2cap_seq_list srej_list; 585 struct l2cap_seq_list retrans_list; 586 587 struct list_head list; 588 struct list_head global_l; 589 590 void *data; 591 const struct l2cap_ops *ops; 592 struct mutex lock; 593 }; 594 595 struct l2cap_ops { 596 char *name; 597 598 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan); 599 int (*recv) (struct l2cap_chan * chan, 600 struct sk_buff *skb); 601 void (*teardown) (struct l2cap_chan *chan, int err); 602 void (*close) (struct l2cap_chan *chan); 603 void (*state_change) (struct l2cap_chan *chan, 604 int state, int err); 605 void (*ready) (struct l2cap_chan *chan); 606 void (*defer) (struct l2cap_chan *chan); 607 void (*resume) (struct l2cap_chan *chan); 608 void (*suspend) (struct l2cap_chan *chan); 609 void (*set_shutdown) (struct l2cap_chan *chan); 610 long (*get_sndtimeo) (struct l2cap_chan *chan); 611 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan, 612 unsigned long hdr_len, 613 unsigned long len, int nb); 614 }; 615 616 struct l2cap_conn { 617 struct hci_conn *hcon; 618 struct hci_chan *hchan; 619 620 unsigned int mtu; 621 622 __u32 feat_mask; 623 __u8 remote_fixed_chan; 624 __u8 local_fixed_chan; 625 626 __u8 info_state; 627 __u8 info_ident; 628 629 struct delayed_work info_timer; 630 631 struct sk_buff *rx_skb; 632 __u32 rx_len; 633 __u8 tx_ident; 634 struct mutex ident_lock; 635 636 struct sk_buff_head pending_rx; 637 struct work_struct pending_rx_work; 638 639 struct work_struct id_addr_update_work; 640 641 __u8 disc_reason; 642 643 struct l2cap_chan *smp; 644 645 struct list_head chan_l; 646 struct mutex chan_lock; 647 struct kref ref; 648 struct list_head users; 649 }; 650 651 struct l2cap_user { 652 struct list_head list; 653 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user); 654 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user); 655 }; 656 657 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01 658 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04 659 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08 660 661 #define L2CAP_CHAN_RAW 1 662 #define L2CAP_CHAN_CONN_LESS 2 663 #define L2CAP_CHAN_CONN_ORIENTED 3 664 #define L2CAP_CHAN_FIXED 4 665 666 /* ----- L2CAP socket info ----- */ 667 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk) 668 669 struct l2cap_pinfo { 670 struct bt_sock bt; 671 struct l2cap_chan *chan; 672 struct sk_buff *rx_busy_skb; 673 }; 674 675 enum { 676 CONF_REQ_SENT, 677 CONF_INPUT_DONE, 678 CONF_OUTPUT_DONE, 679 CONF_MTU_DONE, 680 CONF_MODE_DONE, 681 CONF_CONNECT_PEND, 682 CONF_RECV_NO_FCS, 683 CONF_STATE2_DEVICE, 684 CONF_EWS_RECV, 685 CONF_LOC_CONF_PEND, 686 CONF_REM_CONF_PEND, 687 CONF_NOT_COMPLETE, 688 }; 689 690 #define L2CAP_CONF_MAX_CONF_REQ 2 691 #define L2CAP_CONF_MAX_CONF_RSP 2 692 693 enum { 694 CONN_SREJ_SENT, 695 CONN_WAIT_F, 696 CONN_SREJ_ACT, 697 CONN_SEND_PBIT, 698 CONN_REMOTE_BUSY, 699 CONN_LOCAL_BUSY, 700 CONN_REJ_ACT, 701 CONN_SEND_FBIT, 702 CONN_RNR_SENT, 703 }; 704 705 /* Definitions for flags in l2cap_chan */ 706 enum { 707 FLAG_ROLE_SWITCH, 708 FLAG_FORCE_ACTIVE, 709 FLAG_FORCE_RELIABLE, 710 FLAG_FLUSHABLE, 711 FLAG_EXT_CTRL, 712 FLAG_EFS_ENABLE, 713 FLAG_DEFER_SETUP, 714 FLAG_LE_CONN_REQ_SENT, 715 FLAG_PENDING_SECURITY, 716 FLAG_HOLD_HCI_CONN, 717 }; 718 719 /* Lock nesting levels for L2CAP channels. We need these because lockdep 720 * otherwise considers all channels equal and will e.g. complain about a 721 * connection oriented channel triggering SMP procedures or a listening 722 * channel creating and locking a child channel. 723 */ 724 enum { 725 L2CAP_NESTING_SMP, 726 L2CAP_NESTING_NORMAL, 727 L2CAP_NESTING_PARENT, 728 }; 729 730 enum { 731 L2CAP_TX_STATE_XMIT, 732 L2CAP_TX_STATE_WAIT_F, 733 }; 734 735 enum { 736 L2CAP_RX_STATE_RECV, 737 L2CAP_RX_STATE_SREJ_SENT, 738 L2CAP_RX_STATE_MOVE, 739 L2CAP_RX_STATE_WAIT_P, 740 L2CAP_RX_STATE_WAIT_F, 741 }; 742 743 enum { 744 L2CAP_TXSEQ_EXPECTED, 745 L2CAP_TXSEQ_EXPECTED_SREJ, 746 L2CAP_TXSEQ_UNEXPECTED, 747 L2CAP_TXSEQ_UNEXPECTED_SREJ, 748 L2CAP_TXSEQ_DUPLICATE, 749 L2CAP_TXSEQ_DUPLICATE_SREJ, 750 L2CAP_TXSEQ_INVALID, 751 L2CAP_TXSEQ_INVALID_IGNORE, 752 }; 753 754 enum { 755 L2CAP_EV_DATA_REQUEST, 756 L2CAP_EV_LOCAL_BUSY_DETECTED, 757 L2CAP_EV_LOCAL_BUSY_CLEAR, 758 L2CAP_EV_RECV_REQSEQ_AND_FBIT, 759 L2CAP_EV_RECV_FBIT, 760 L2CAP_EV_RETRANS_TO, 761 L2CAP_EV_MONITOR_TO, 762 L2CAP_EV_EXPLICIT_POLL, 763 L2CAP_EV_RECV_IFRAME, 764 L2CAP_EV_RECV_RR, 765 L2CAP_EV_RECV_REJ, 766 L2CAP_EV_RECV_RNR, 767 L2CAP_EV_RECV_SREJ, 768 L2CAP_EV_RECV_FRAME, 769 }; 770 771 enum { 772 L2CAP_MOVE_ROLE_NONE, 773 L2CAP_MOVE_ROLE_INITIATOR, 774 L2CAP_MOVE_ROLE_RESPONDER, 775 }; 776 777 enum { 778 L2CAP_MOVE_STABLE, 779 L2CAP_MOVE_WAIT_REQ, 780 L2CAP_MOVE_WAIT_RSP, 781 L2CAP_MOVE_WAIT_RSP_SUCCESS, 782 L2CAP_MOVE_WAIT_CONFIRM, 783 L2CAP_MOVE_WAIT_CONFIRM_RSP, 784 L2CAP_MOVE_WAIT_LOGICAL_COMP, 785 L2CAP_MOVE_WAIT_LOGICAL_CFM, 786 L2CAP_MOVE_WAIT_LOCAL_BUSY, 787 L2CAP_MOVE_WAIT_PREPARE, 788 }; 789 790 void l2cap_chan_hold(struct l2cap_chan *c); 791 void l2cap_chan_put(struct l2cap_chan *c); 792 793 static inline void l2cap_chan_lock(struct l2cap_chan *chan) 794 { 795 mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting)); 796 } 797 798 static inline void l2cap_chan_unlock(struct l2cap_chan *chan) 799 { 800 mutex_unlock(&chan->lock); 801 } 802 803 static inline void l2cap_set_timer(struct l2cap_chan *chan, 804 struct delayed_work *work, long timeout) 805 { 806 BT_DBG("chan %p state %s timeout %ld", chan, 807 state_to_string(chan->state), timeout); 808 809 /* If delayed work cancelled do not hold(chan) 810 since it is already done with previous set_timer */ 811 if (!cancel_delayed_work(work)) 812 l2cap_chan_hold(chan); 813 814 schedule_delayed_work(work, timeout); 815 } 816 817 static inline bool l2cap_clear_timer(struct l2cap_chan *chan, 818 struct delayed_work *work) 819 { 820 bool ret; 821 822 /* put(chan) if delayed work cancelled otherwise it 823 is done in delayed work function */ 824 ret = cancel_delayed_work(work); 825 if (ret) 826 l2cap_chan_put(chan); 827 828 return ret; 829 } 830 831 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t)) 832 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer) 833 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer) 834 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer) 835 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \ 836 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO)); 837 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer) 838 839 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2) 840 { 841 if (seq1 >= seq2) 842 return seq1 - seq2; 843 else 844 return chan->tx_win_max + 1 - seq2 + seq1; 845 } 846 847 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq) 848 { 849 return (seq + 1) % (chan->tx_win_max + 1); 850 } 851 852 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan) 853 { 854 return NULL; 855 } 856 857 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb) 858 { 859 return -ENOSYS; 860 } 861 862 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan, 863 unsigned long hdr_len, 864 unsigned long len, int nb) 865 { 866 return ERR_PTR(-ENOSYS); 867 } 868 869 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err) 870 { 871 } 872 873 static inline void l2cap_chan_no_close(struct l2cap_chan *chan) 874 { 875 } 876 877 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan) 878 { 879 } 880 881 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan, 882 int state, int err) 883 { 884 } 885 886 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan) 887 { 888 } 889 890 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan) 891 { 892 } 893 894 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan) 895 { 896 } 897 898 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan) 899 { 900 } 901 902 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan) 903 { 904 return 0; 905 } 906 907 extern bool disable_ertm; 908 909 int l2cap_init_sockets(void); 910 void l2cap_cleanup_sockets(void); 911 bool l2cap_is_socket(struct socket *sock); 912 913 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan); 914 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan); 915 916 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm); 917 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid); 918 919 struct l2cap_chan *l2cap_chan_create(void); 920 void l2cap_chan_close(struct l2cap_chan *chan, int reason); 921 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, 922 bdaddr_t *dst, u8 dst_type); 923 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len); 924 void l2cap_chan_busy(struct l2cap_chan *chan, int busy); 925 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator); 926 void l2cap_chan_set_defaults(struct l2cap_chan *chan); 927 int l2cap_ertm_init(struct l2cap_chan *chan); 928 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan); 929 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan); 930 void l2cap_chan_del(struct l2cap_chan *chan, int err); 931 void l2cap_send_conn_req(struct l2cap_chan *chan); 932 void l2cap_move_start(struct l2cap_chan *chan); 933 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, 934 u8 status); 935 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result); 936 937 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn); 938 void l2cap_conn_put(struct l2cap_conn *conn); 939 940 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user); 941 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user); 942 943 #endif /* __L2CAP_H */ 944