1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 BlueZ - Bluetooth protocol stack for Linux 4 Copyright (C) 2000-2001 Qualcomm Incorporated 5 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> 6 Copyright (C) 2010 Google Inc. 7 8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 9 10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 21 SOFTWARE IS DISCLAIMED. 22 */ 23 24 #ifndef __L2CAP_H 25 #define __L2CAP_H 26 27 #include <linux/unaligned.h> 28 #include <linux/atomic.h> 29 30 /* L2CAP defaults */ 31 #define L2CAP_DEFAULT_MTU 672 32 #define L2CAP_DEFAULT_MIN_MTU 48 33 #define L2CAP_SIG_MTU 48 /* BR/EDR signaling MTU */ 34 #define L2CAP_DEFAULT_FLUSH_TO 0xFFFF 35 #define L2CAP_EFS_DEFAULT_FLUSH_TO 0xFFFFFFFF 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 1492 /* Sized for AMP 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 #define L2CAP_ECRED_CONN_SCID_MAX 5 49 50 #define L2CAP_DISC_TIMEOUT msecs_to_jiffies(100) 51 #define L2CAP_DISC_REJ_TIMEOUT msecs_to_jiffies(5000) 52 #define L2CAP_ENC_TIMEOUT msecs_to_jiffies(5000) 53 #define L2CAP_CONN_TIMEOUT msecs_to_jiffies(40000) 54 #define L2CAP_INFO_TIMEOUT msecs_to_jiffies(4000) 55 #define L2CAP_MOVE_TIMEOUT msecs_to_jiffies(4000) 56 #define L2CAP_MOVE_ERTX_TIMEOUT msecs_to_jiffies(60000) 57 #define L2CAP_WAIT_ACK_POLL_PERIOD msecs_to_jiffies(200) 58 #define L2CAP_WAIT_ACK_TIMEOUT msecs_to_jiffies(10000) 59 60 /* L2CAP socket address */ 61 struct sockaddr_l2 { 62 sa_family_t l2_family; 63 __le16 l2_psm; 64 bdaddr_t l2_bdaddr; 65 __le16 l2_cid; 66 __u8 l2_bdaddr_type; 67 }; 68 69 /* L2CAP socket options */ 70 #define L2CAP_OPTIONS 0x01 71 struct l2cap_options { 72 __u16 omtu; 73 __u16 imtu; 74 __u16 flush_to; 75 __u8 mode; 76 __u8 fcs; 77 __u8 max_tx; 78 __u16 txwin_size; 79 }; 80 81 #define L2CAP_CONNINFO 0x02 82 struct l2cap_conninfo { 83 __u16 hci_handle; 84 __u8 dev_class[3]; 85 }; 86 87 #define L2CAP_LM 0x03 88 #define L2CAP_LM_MASTER 0x0001 89 #define L2CAP_LM_AUTH 0x0002 90 #define L2CAP_LM_ENCRYPT 0x0004 91 #define L2CAP_LM_TRUSTED 0x0008 92 #define L2CAP_LM_RELIABLE 0x0010 93 #define L2CAP_LM_SECURE 0x0020 94 #define L2CAP_LM_FIPS 0x0040 95 96 /* L2CAP command codes */ 97 #define L2CAP_COMMAND_REJ 0x01 98 #define L2CAP_CONN_REQ 0x02 99 #define L2CAP_CONN_RSP 0x03 100 #define L2CAP_CONF_REQ 0x04 101 #define L2CAP_CONF_RSP 0x05 102 #define L2CAP_DISCONN_REQ 0x06 103 #define L2CAP_DISCONN_RSP 0x07 104 #define L2CAP_ECHO_REQ 0x08 105 #define L2CAP_ECHO_RSP 0x09 106 #define L2CAP_INFO_REQ 0x0a 107 #define L2CAP_INFO_RSP 0x0b 108 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12 109 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13 110 #define L2CAP_LE_CONN_REQ 0x14 111 #define L2CAP_LE_CONN_RSP 0x15 112 #define L2CAP_LE_CREDITS 0x16 113 #define L2CAP_ECRED_CONN_REQ 0x17 114 #define L2CAP_ECRED_CONN_RSP 0x18 115 #define L2CAP_ECRED_RECONF_REQ 0x19 116 #define L2CAP_ECRED_RECONF_RSP 0x1a 117 118 /* L2CAP extended feature mask */ 119 #define L2CAP_FEAT_FLOWCTL 0x00000001 120 #define L2CAP_FEAT_RETRANS 0x00000002 121 #define L2CAP_FEAT_BIDIR_QOS 0x00000004 122 #define L2CAP_FEAT_ERTM 0x00000008 123 #define L2CAP_FEAT_STREAMING 0x00000010 124 #define L2CAP_FEAT_FCS 0x00000020 125 #define L2CAP_FEAT_EXT_FLOW 0x00000040 126 #define L2CAP_FEAT_FIXED_CHAN 0x00000080 127 #define L2CAP_FEAT_EXT_WINDOW 0x00000100 128 #define L2CAP_FEAT_UCD 0x00000200 129 130 /* L2CAP checksum option */ 131 #define L2CAP_FCS_NONE 0x00 132 #define L2CAP_FCS_CRC16 0x01 133 134 /* L2CAP fixed channels */ 135 #define L2CAP_FC_SIG_BREDR 0x02 136 #define L2CAP_FC_CONNLESS 0x04 137 #define L2CAP_FC_ATT 0x10 138 #define L2CAP_FC_SIG_LE 0x20 139 #define L2CAP_FC_SMP_LE 0x40 140 #define L2CAP_FC_SMP_BREDR 0x80 141 142 /* L2CAP Control Field bit masks */ 143 #define L2CAP_CTRL_SAR 0xC000 144 #define L2CAP_CTRL_REQSEQ 0x3F00 145 #define L2CAP_CTRL_TXSEQ 0x007E 146 #define L2CAP_CTRL_SUPERVISE 0x000C 147 148 #define L2CAP_CTRL_RETRANS 0x0080 149 #define L2CAP_CTRL_FINAL 0x0080 150 #define L2CAP_CTRL_POLL 0x0010 151 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */ 152 153 #define L2CAP_CTRL_TXSEQ_SHIFT 1 154 #define L2CAP_CTRL_SUPER_SHIFT 2 155 #define L2CAP_CTRL_POLL_SHIFT 4 156 #define L2CAP_CTRL_FINAL_SHIFT 7 157 #define L2CAP_CTRL_REQSEQ_SHIFT 8 158 #define L2CAP_CTRL_SAR_SHIFT 14 159 160 /* L2CAP Extended Control Field bit mask */ 161 #define L2CAP_EXT_CTRL_TXSEQ 0xFFFC0000 162 #define L2CAP_EXT_CTRL_SAR 0x00030000 163 #define L2CAP_EXT_CTRL_SUPERVISE 0x00030000 164 #define L2CAP_EXT_CTRL_REQSEQ 0x0000FFFC 165 166 #define L2CAP_EXT_CTRL_POLL 0x00040000 167 #define L2CAP_EXT_CTRL_FINAL 0x00000002 168 #define L2CAP_EXT_CTRL_FRAME_TYPE 0x00000001 /* I- or S-Frame */ 169 170 #define L2CAP_EXT_CTRL_FINAL_SHIFT 1 171 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT 2 172 #define L2CAP_EXT_CTRL_SAR_SHIFT 16 173 #define L2CAP_EXT_CTRL_SUPER_SHIFT 16 174 #define L2CAP_EXT_CTRL_POLL_SHIFT 18 175 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT 18 176 177 /* L2CAP Supervisory Function */ 178 #define L2CAP_SUPER_RR 0x00 179 #define L2CAP_SUPER_REJ 0x01 180 #define L2CAP_SUPER_RNR 0x02 181 #define L2CAP_SUPER_SREJ 0x03 182 183 /* L2CAP Segmentation and Reassembly */ 184 #define L2CAP_SAR_UNSEGMENTED 0x00 185 #define L2CAP_SAR_START 0x01 186 #define L2CAP_SAR_END 0x02 187 #define L2CAP_SAR_CONTINUE 0x03 188 189 /* L2CAP Command rej. reasons */ 190 #define L2CAP_REJ_NOT_UNDERSTOOD 0x0000 191 #define L2CAP_REJ_MTU_EXCEEDED 0x0001 192 #define L2CAP_REJ_INVALID_CID 0x0002 193 194 /* L2CAP structures */ 195 struct l2cap_hdr { 196 __le16 len; 197 __le16 cid; 198 } __packed; 199 #define L2CAP_LEN_SIZE 2 200 #define L2CAP_HDR_SIZE 4 201 #define L2CAP_ENH_HDR_SIZE 6 202 #define L2CAP_EXT_HDR_SIZE 8 203 204 #define L2CAP_FCS_SIZE 2 205 #define L2CAP_SDULEN_SIZE 2 206 #define L2CAP_PSMLEN_SIZE 2 207 #define L2CAP_ENH_CTRL_SIZE 2 208 #define L2CAP_EXT_CTRL_SIZE 4 209 210 struct l2cap_cmd_hdr { 211 __u8 code; 212 __u8 ident; 213 __le16 len; 214 } __packed; 215 #define L2CAP_CMD_HDR_SIZE 4 216 217 struct l2cap_cmd_rej_unk { 218 __le16 reason; 219 } __packed; 220 221 struct l2cap_cmd_rej_mtu { 222 __le16 reason; 223 __le16 max_mtu; 224 } __packed; 225 226 struct l2cap_cmd_rej_cid { 227 __le16 reason; 228 __le16 scid; 229 __le16 dcid; 230 } __packed; 231 232 struct l2cap_conn_req { 233 __le16 psm; 234 __le16 scid; 235 } __packed; 236 237 struct l2cap_conn_rsp { 238 __le16 dcid; 239 __le16 scid; 240 __le16 result; 241 __le16 status; 242 } __packed; 243 244 /* protocol/service multiplexer (PSM) */ 245 #define L2CAP_PSM_SDP 0x0001 246 #define L2CAP_PSM_RFCOMM 0x0003 247 #define L2CAP_PSM_3DSP 0x0021 248 #define L2CAP_PSM_IPSP 0x0023 /* 6LoWPAN */ 249 250 #define L2CAP_PSM_DYN_START 0x1001 251 #define L2CAP_PSM_DYN_END 0xffff 252 #define L2CAP_PSM_AUTO_END 0x10ff 253 #define L2CAP_PSM_LE_DYN_START 0x0080 254 #define L2CAP_PSM_LE_DYN_END 0x00ff 255 256 /* channel identifier */ 257 #define L2CAP_CID_SIGNALING 0x0001 258 #define L2CAP_CID_CONN_LESS 0x0002 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_INVALID_SCID 0x0006 274 #define L2CAP_CR_SCID_IN_USE 0x0007 275 276 /* credit based connect results */ 277 #define L2CAP_CR_LE_SUCCESS 0x0000 278 #define L2CAP_CR_LE_BAD_PSM 0x0002 279 #define L2CAP_CR_LE_NO_MEM 0x0004 280 #define L2CAP_CR_LE_AUTHENTICATION 0x0005 281 #define L2CAP_CR_LE_AUTHORIZATION 0x0006 282 #define L2CAP_CR_LE_BAD_KEY_SIZE 0x0007 283 #define L2CAP_CR_LE_ENCRYPTION 0x0008 284 #define L2CAP_CR_LE_INVALID_SCID 0x0009 285 #define L2CAP_CR_LE_SCID_IN_USE 0x000A 286 #define L2CAP_CR_LE_UNACCEPT_PARAMS 0x000B 287 #define L2CAP_CR_LE_INVALID_PARAMS 0x000C 288 289 /* connect/create channel status */ 290 #define L2CAP_CS_NO_INFO 0x0000 291 #define L2CAP_CS_AUTHEN_PEND 0x0001 292 #define L2CAP_CS_AUTHOR_PEND 0x0002 293 294 struct l2cap_conf_req { 295 __le16 dcid; 296 __le16 flags; 297 __u8 data[]; 298 } __packed; 299 300 struct l2cap_conf_rsp { 301 __le16 scid; 302 __le16 flags; 303 __le16 result; 304 __u8 data[]; 305 } __packed; 306 307 #define L2CAP_CONF_SUCCESS 0x0000 308 #define L2CAP_CONF_UNACCEPT 0x0001 309 #define L2CAP_CONF_REJECT 0x0002 310 #define L2CAP_CONF_UNKNOWN 0x0003 311 #define L2CAP_CONF_PENDING 0x0004 312 #define L2CAP_CONF_EFS_REJECT 0x0005 313 314 /* configuration req/rsp continuation flag */ 315 #define L2CAP_CONF_FLAG_CONTINUATION 0x0001 316 317 struct l2cap_conf_opt { 318 __u8 type; 319 __u8 len; 320 __u8 val[]; 321 } __packed; 322 #define L2CAP_CONF_OPT_SIZE 2 323 324 #define L2CAP_CONF_HINT 0x80 325 #define L2CAP_CONF_MASK 0x7f 326 327 #define L2CAP_CONF_MTU 0x01 328 #define L2CAP_CONF_FLUSH_TO 0x02 329 #define L2CAP_CONF_QOS 0x03 330 #define L2CAP_CONF_RFC 0x04 331 #define L2CAP_CONF_FCS 0x05 332 #define L2CAP_CONF_EFS 0x06 333 #define L2CAP_CONF_EWS 0x07 334 335 #define L2CAP_CONF_MAX_SIZE 22 336 337 struct l2cap_conf_rfc { 338 __u8 mode; 339 __u8 txwin_size; 340 __u8 max_transmit; 341 __le16 retrans_timeout; 342 __le16 monitor_timeout; 343 __le16 max_pdu_size; 344 } __packed; 345 346 #define L2CAP_MODE_BASIC 0x00 347 #define L2CAP_MODE_RETRANS 0x01 348 #define L2CAP_MODE_FLOWCTL 0x02 349 #define L2CAP_MODE_ERTM 0x03 350 #define L2CAP_MODE_STREAMING 0x04 351 352 /* Unlike the above this one doesn't actually map to anything that would 353 * ever be sent over the air. Therefore, use a value that's unlikely to 354 * ever be used in the BR/EDR configuration phase. 355 */ 356 #define L2CAP_MODE_LE_FLOWCTL 0x80 357 #define L2CAP_MODE_EXT_FLOWCTL 0x81 358 359 struct l2cap_conf_efs { 360 __u8 id; 361 __u8 stype; 362 __le16 msdu; 363 __le32 sdu_itime; 364 __le32 acc_lat; 365 __le32 flush_to; 366 } __packed; 367 368 #define L2CAP_SERV_NOTRAFIC 0x00 369 #define L2CAP_SERV_BESTEFFORT 0x01 370 #define L2CAP_SERV_GUARANTEED 0x02 371 372 #define L2CAP_BESTEFFORT_ID 0x01 373 374 struct l2cap_disconn_req { 375 __le16 dcid; 376 __le16 scid; 377 } __packed; 378 379 struct l2cap_disconn_rsp { 380 __le16 dcid; 381 __le16 scid; 382 } __packed; 383 384 struct l2cap_info_req { 385 __le16 type; 386 } __packed; 387 388 struct l2cap_info_rsp { 389 __le16 type; 390 __le16 result; 391 __u8 data[]; 392 } __packed; 393 394 #define L2CAP_MR_SUCCESS 0x0000 395 #define L2CAP_MR_PEND 0x0001 396 #define L2CAP_MR_BAD_ID 0x0002 397 #define L2CAP_MR_SAME_ID 0x0003 398 #define L2CAP_MR_NOT_SUPP 0x0004 399 #define L2CAP_MR_COLLISION 0x0005 400 #define L2CAP_MR_NOT_ALLOWED 0x0006 401 402 struct l2cap_move_chan_cfm { 403 __le16 icid; 404 __le16 result; 405 } __packed; 406 407 #define L2CAP_MC_CONFIRMED 0x0000 408 #define L2CAP_MC_UNCONFIRMED 0x0001 409 410 struct l2cap_move_chan_cfm_rsp { 411 __le16 icid; 412 } __packed; 413 414 /* info type */ 415 #define L2CAP_IT_CL_MTU 0x0001 416 #define L2CAP_IT_FEAT_MASK 0x0002 417 #define L2CAP_IT_FIXED_CHAN 0x0003 418 419 /* info result */ 420 #define L2CAP_IR_SUCCESS 0x0000 421 #define L2CAP_IR_NOTSUPP 0x0001 422 423 struct l2cap_conn_param_update_req { 424 __le16 min; 425 __le16 max; 426 __le16 latency; 427 __le16 to_multiplier; 428 } __packed; 429 430 struct l2cap_conn_param_update_rsp { 431 __le16 result; 432 } __packed; 433 434 /* Connection Parameters result */ 435 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000 436 #define L2CAP_CONN_PARAM_REJECTED 0x0001 437 438 struct l2cap_le_conn_req { 439 __le16 psm; 440 __le16 scid; 441 __le16 mtu; 442 __le16 mps; 443 __le16 credits; 444 } __packed; 445 446 struct l2cap_le_conn_rsp { 447 __le16 dcid; 448 __le16 mtu; 449 __le16 mps; 450 __le16 credits; 451 __le16 result; 452 } __packed; 453 454 struct l2cap_le_credits { 455 __le16 cid; 456 __le16 credits; 457 } __packed; 458 459 #define L2CAP_ECRED_MIN_MTU 64 460 #define L2CAP_ECRED_MIN_MPS 64 461 #define L2CAP_ECRED_MAX_CID 5 462 463 struct l2cap_ecred_conn_req { 464 /* New members must be added within the struct_group() macro below. */ 465 __struct_group(l2cap_ecred_conn_req_hdr, hdr, __packed, 466 __le16 psm; 467 __le16 mtu; 468 __le16 mps; 469 __le16 credits; 470 ); 471 __le16 scid[]; 472 } __packed; 473 474 struct l2cap_ecred_conn_rsp { 475 /* New members must be added within the struct_group() macro below. */ 476 struct_group_tagged(l2cap_ecred_conn_rsp_hdr, hdr, 477 __le16 mtu; 478 __le16 mps; 479 __le16 credits; 480 __le16 result; 481 ); 482 __le16 dcid[]; 483 }; 484 485 struct l2cap_ecred_reconf_req { 486 __le16 mtu; 487 __le16 mps; 488 __le16 scid[]; 489 } __packed; 490 491 #define L2CAP_RECONF_SUCCESS 0x0000 492 #define L2CAP_RECONF_INVALID_MTU 0x0001 493 #define L2CAP_RECONF_INVALID_MPS 0x0002 494 #define L2CAP_RECONF_INVALID_CID 0x0003 495 #define L2CAP_RECONF_INVALID_PARAMS 0x0004 496 497 struct l2cap_ecred_reconf_rsp { 498 __le16 result; 499 } __packed; 500 501 /* ----- L2CAP channels and connections ----- */ 502 struct l2cap_seq_list { 503 __u16 head; 504 __u16 tail; 505 __u16 mask; 506 __u16 *list; 507 }; 508 509 #define L2CAP_SEQ_LIST_CLEAR 0xFFFF 510 #define L2CAP_SEQ_LIST_TAIL 0x8000 511 512 struct l2cap_chan { 513 struct l2cap_conn *conn; 514 struct kref kref; 515 atomic_t nesting; 516 517 __u8 state; 518 519 bdaddr_t dst; 520 __u8 dst_type; 521 bdaddr_t src; 522 __u8 src_type; 523 __le16 psm; 524 __le16 sport; 525 __u16 dcid; 526 __u16 scid; 527 528 __u16 imtu; 529 __u16 omtu; 530 __u16 flush_to; 531 __u8 mode; 532 __u8 chan_type; 533 __u8 chan_policy; 534 535 __u8 sec_level; 536 537 __u8 ident; 538 539 __u8 conf_req[64]; 540 __u8 conf_len; 541 __u8 num_conf_req; 542 __u8 num_conf_rsp; 543 544 __u8 fcs; 545 546 __u16 tx_win; 547 __u16 tx_win_max; 548 __u16 ack_win; 549 __u8 max_tx; 550 __u16 retrans_timeout; 551 __u16 monitor_timeout; 552 __u16 mps; 553 554 __u16 tx_credits; 555 __u16 rx_credits; 556 557 /* estimated available receive buffer space or -1 if unknown */ 558 ssize_t rx_avail; 559 560 __u8 tx_state; 561 __u8 rx_state; 562 563 unsigned long conf_state; 564 unsigned long conn_state; 565 unsigned long flags; 566 567 __u16 next_tx_seq; 568 __u16 expected_ack_seq; 569 __u16 expected_tx_seq; 570 __u16 buffer_seq; 571 __u16 srej_save_reqseq; 572 __u16 last_acked_seq; 573 __u16 frames_sent; 574 __u16 unacked_frames; 575 __u8 retry_count; 576 __u16 sdu_len; 577 struct sk_buff *sdu; 578 struct sk_buff *sdu_last_frag; 579 580 __u16 remote_tx_win; 581 __u8 remote_max_tx; 582 __u16 remote_mps; 583 584 __u8 local_id; 585 __u8 local_stype; 586 __u16 local_msdu; 587 __u32 local_sdu_itime; 588 __u32 local_acc_lat; 589 __u32 local_flush_to; 590 591 __u8 remote_id; 592 __u8 remote_stype; 593 __u16 remote_msdu; 594 __u32 remote_sdu_itime; 595 __u32 remote_acc_lat; 596 __u32 remote_flush_to; 597 598 struct delayed_work chan_timer; 599 struct delayed_work retrans_timer; 600 struct delayed_work monitor_timer; 601 struct delayed_work ack_timer; 602 603 struct sk_buff *tx_send_head; 604 struct sk_buff_head tx_q; 605 struct sk_buff_head srej_q; 606 struct l2cap_seq_list srej_list; 607 struct l2cap_seq_list retrans_list; 608 609 struct list_head list; 610 struct list_head global_l; 611 612 void *data; 613 const struct l2cap_ops *ops; 614 struct mutex lock; 615 }; 616 617 struct l2cap_ops { 618 char *name; 619 620 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan); 621 int (*recv) (struct l2cap_chan * chan, 622 struct sk_buff *skb); 623 void (*teardown) (struct l2cap_chan *chan, int err); 624 void (*close) (struct l2cap_chan *chan); 625 void (*state_change) (struct l2cap_chan *chan, 626 int state, int err); 627 void (*ready) (struct l2cap_chan *chan); 628 void (*defer) (struct l2cap_chan *chan); 629 void (*resume) (struct l2cap_chan *chan); 630 void (*suspend) (struct l2cap_chan *chan); 631 void (*set_shutdown) (struct l2cap_chan *chan); 632 long (*get_sndtimeo) (struct l2cap_chan *chan); 633 struct pid *(*get_peer_pid) (struct l2cap_chan *chan); 634 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan, 635 unsigned long hdr_len, 636 unsigned long len, int nb); 637 int (*filter) (struct l2cap_chan * chan, 638 struct sk_buff *skb); 639 }; 640 641 struct l2cap_conn { 642 struct hci_conn *hcon; 643 struct hci_chan *hchan; 644 645 unsigned int mtu; 646 647 __u32 feat_mask; 648 __u8 remote_fixed_chan; 649 __u8 local_fixed_chan; 650 651 __u8 info_state; 652 __u8 info_ident; 653 654 struct delayed_work info_timer; 655 656 struct sk_buff *rx_skb; 657 __u32 rx_len; 658 struct ida tx_ida; 659 __u8 tx_ident; 660 661 struct sk_buff_head pending_rx; 662 struct work_struct pending_rx_work; 663 664 struct delayed_work id_addr_timer; 665 666 __u8 disc_reason; 667 668 struct l2cap_chan *smp; 669 670 struct list_head chan_l; 671 struct mutex lock; 672 struct kref ref; 673 struct list_head users; 674 }; 675 676 struct l2cap_user { 677 struct list_head list; 678 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user); 679 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user); 680 }; 681 682 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01 683 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04 684 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08 685 686 #define L2CAP_CHAN_RAW 1 687 #define L2CAP_CHAN_CONN_LESS 2 688 #define L2CAP_CHAN_CONN_ORIENTED 3 689 #define L2CAP_CHAN_FIXED 4 690 691 /* ----- L2CAP socket info ----- */ 692 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk) 693 694 struct l2cap_rx_busy { 695 struct list_head list; 696 struct sk_buff *skb; 697 }; 698 699 struct l2cap_pinfo { 700 struct bt_sock bt; 701 struct l2cap_chan *chan; 702 struct list_head rx_busy; 703 }; 704 705 enum { 706 CONF_REQ_SENT, 707 CONF_INPUT_DONE, 708 CONF_OUTPUT_DONE, 709 CONF_MTU_DONE, 710 CONF_MODE_DONE, 711 CONF_CONNECT_PEND, 712 CONF_RECV_NO_FCS, 713 CONF_STATE2_DEVICE, 714 CONF_EWS_RECV, 715 CONF_LOC_CONF_PEND, 716 CONF_REM_CONF_PEND, 717 CONF_NOT_COMPLETE, 718 }; 719 720 #define L2CAP_CONF_MAX_CONF_REQ 2 721 #define L2CAP_CONF_MAX_CONF_RSP 2 722 723 enum { 724 CONN_SREJ_SENT, 725 CONN_WAIT_F, 726 CONN_SREJ_ACT, 727 CONN_SEND_PBIT, 728 CONN_REMOTE_BUSY, 729 CONN_LOCAL_BUSY, 730 CONN_REJ_ACT, 731 CONN_SEND_FBIT, 732 CONN_RNR_SENT, 733 }; 734 735 /* Definitions for flags in l2cap_chan */ 736 enum { 737 FLAG_ROLE_SWITCH, 738 FLAG_FORCE_ACTIVE, 739 FLAG_FORCE_RELIABLE, 740 FLAG_FLUSHABLE, 741 FLAG_EXT_CTRL, 742 FLAG_EFS_ENABLE, 743 FLAG_DEFER_SETUP, 744 FLAG_LE_CONN_REQ_SENT, 745 FLAG_ECRED_CONN_REQ_SENT, 746 FLAG_PENDING_SECURITY, 747 FLAG_HOLD_HCI_CONN, 748 FLAG_DEL, 749 }; 750 751 /* Lock nesting levels for L2CAP channels. We need these because lockdep 752 * otherwise considers all channels equal and will e.g. complain about a 753 * connection oriented channel triggering SMP procedures or a listening 754 * channel creating and locking a child channel. 755 */ 756 enum { 757 L2CAP_NESTING_SMP, 758 L2CAP_NESTING_NORMAL, 759 L2CAP_NESTING_PARENT, 760 }; 761 762 enum { 763 L2CAP_TX_STATE_XMIT, 764 L2CAP_TX_STATE_WAIT_F, 765 }; 766 767 enum { 768 L2CAP_RX_STATE_RECV, 769 L2CAP_RX_STATE_SREJ_SENT, 770 L2CAP_RX_STATE_MOVE, 771 L2CAP_RX_STATE_WAIT_P, 772 L2CAP_RX_STATE_WAIT_F, 773 }; 774 775 enum { 776 L2CAP_TXSEQ_EXPECTED, 777 L2CAP_TXSEQ_EXPECTED_SREJ, 778 L2CAP_TXSEQ_UNEXPECTED, 779 L2CAP_TXSEQ_UNEXPECTED_SREJ, 780 L2CAP_TXSEQ_DUPLICATE, 781 L2CAP_TXSEQ_DUPLICATE_SREJ, 782 L2CAP_TXSEQ_INVALID, 783 L2CAP_TXSEQ_INVALID_IGNORE, 784 }; 785 786 enum { 787 L2CAP_EV_DATA_REQUEST, 788 L2CAP_EV_LOCAL_BUSY_DETECTED, 789 L2CAP_EV_LOCAL_BUSY_CLEAR, 790 L2CAP_EV_RECV_REQSEQ_AND_FBIT, 791 L2CAP_EV_RECV_FBIT, 792 L2CAP_EV_RETRANS_TO, 793 L2CAP_EV_MONITOR_TO, 794 L2CAP_EV_EXPLICIT_POLL, 795 L2CAP_EV_RECV_IFRAME, 796 L2CAP_EV_RECV_RR, 797 L2CAP_EV_RECV_REJ, 798 L2CAP_EV_RECV_RNR, 799 L2CAP_EV_RECV_SREJ, 800 L2CAP_EV_RECV_FRAME, 801 }; 802 803 enum { 804 L2CAP_MOVE_ROLE_NONE, 805 L2CAP_MOVE_ROLE_INITIATOR, 806 L2CAP_MOVE_ROLE_RESPONDER, 807 }; 808 809 enum { 810 L2CAP_MOVE_STABLE, 811 L2CAP_MOVE_WAIT_REQ, 812 L2CAP_MOVE_WAIT_RSP, 813 L2CAP_MOVE_WAIT_RSP_SUCCESS, 814 L2CAP_MOVE_WAIT_CONFIRM, 815 L2CAP_MOVE_WAIT_CONFIRM_RSP, 816 L2CAP_MOVE_WAIT_LOGICAL_COMP, 817 L2CAP_MOVE_WAIT_LOGICAL_CFM, 818 L2CAP_MOVE_WAIT_LOCAL_BUSY, 819 L2CAP_MOVE_WAIT_PREPARE, 820 }; 821 822 void l2cap_chan_hold(struct l2cap_chan *c); 823 struct l2cap_chan *l2cap_chan_hold_unless_zero(struct l2cap_chan *c); 824 void l2cap_chan_put(struct l2cap_chan *c); 825 826 static inline void l2cap_chan_lock(struct l2cap_chan *chan) 827 { 828 mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting)); 829 } 830 831 static inline void l2cap_chan_unlock(struct l2cap_chan *chan) 832 { 833 mutex_unlock(&chan->lock); 834 } 835 836 static inline void l2cap_set_timer(struct l2cap_chan *chan, 837 struct delayed_work *work, long timeout) 838 { 839 BT_DBG("chan %p state %s timeout %ld", chan, 840 state_to_string(chan->state), timeout); 841 842 /* If delayed work cancelled do not hold(chan) 843 since it is already done with previous set_timer */ 844 if (!cancel_delayed_work(work)) 845 l2cap_chan_hold(chan); 846 847 schedule_delayed_work(work, timeout); 848 } 849 850 static inline bool l2cap_clear_timer(struct l2cap_chan *chan, 851 struct delayed_work *work) 852 { 853 bool ret; 854 855 /* put(chan) if delayed work cancelled otherwise it 856 is done in delayed work function */ 857 ret = cancel_delayed_work(work); 858 if (ret) 859 l2cap_chan_put(chan); 860 861 return ret; 862 } 863 864 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t)) 865 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer) 866 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer) 867 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer) 868 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \ 869 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO)); 870 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer) 871 872 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2) 873 { 874 if (seq1 >= seq2) 875 return seq1 - seq2; 876 else 877 return chan->tx_win_max + 1 - seq2 + seq1; 878 } 879 880 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq) 881 { 882 return (seq + 1) % (chan->tx_win_max + 1); 883 } 884 885 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan) 886 { 887 return NULL; 888 } 889 890 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb) 891 { 892 return -ENOSYS; 893 } 894 895 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan, 896 unsigned long hdr_len, 897 unsigned long len, int nb) 898 { 899 return ERR_PTR(-ENOSYS); 900 } 901 902 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err) 903 { 904 } 905 906 static inline void l2cap_chan_no_close(struct l2cap_chan *chan) 907 { 908 } 909 910 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan) 911 { 912 } 913 914 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan, 915 int state, int err) 916 { 917 } 918 919 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan) 920 { 921 } 922 923 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan) 924 { 925 } 926 927 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan) 928 { 929 } 930 931 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan) 932 { 933 } 934 935 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan) 936 { 937 return 0; 938 } 939 940 extern bool disable_ertm; 941 extern bool enable_ecred; 942 943 int l2cap_init_sockets(void); 944 void l2cap_cleanup_sockets(void); 945 bool l2cap_is_socket(struct socket *sock); 946 947 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan); 948 void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan); 949 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan); 950 951 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm); 952 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid); 953 954 struct l2cap_chan *l2cap_chan_create(void); 955 void l2cap_chan_close(struct l2cap_chan *chan, int reason); 956 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, 957 bdaddr_t *dst, u8 dst_type, u16 timeout); 958 int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu); 959 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, 960 const struct sockcm_cookie *sockc); 961 void l2cap_chan_busy(struct l2cap_chan *chan, int busy); 962 void l2cap_chan_rx_avail(struct l2cap_chan *chan, ssize_t rx_avail); 963 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator); 964 void l2cap_chan_set_defaults(struct l2cap_chan *chan); 965 int l2cap_ertm_init(struct l2cap_chan *chan); 966 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan); 967 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan); 968 typedef void (*l2cap_chan_func_t)(struct l2cap_chan *chan, void *data); 969 void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func, 970 void *data); 971 void l2cap_chan_del(struct l2cap_chan *chan, int err); 972 void l2cap_send_conn_req(struct l2cap_chan *chan); 973 974 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn); 975 struct l2cap_conn *l2cap_conn_hold_unless_zero(struct l2cap_conn *conn); 976 void l2cap_conn_put(struct l2cap_conn *conn); 977 978 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user); 979 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user); 980 981 #endif /* __L2CAP_H */ 982