include/net/bluetooth/l2cap.h

   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 #define L2CAP_CR_INVALID_SCID   0x0009
 279 #define L2CAP_CR_SCID_IN_USE    0x0010
 280
 281 /* connect/create channel status */
 282 #define L2CAP_CS_NO_INFO        0x0000
 283 #define L2CAP_CS_AUTHEN_PEND    0x0001
 284 #define L2CAP_CS_AUTHOR_PEND    0x0002
 285
 286 struct l2cap_conf_req {
 287         __le16     dcid;
 288         __le16     flags;
 289         __u8       data[0];
 290 } __packed;
 291
 292 struct l2cap_conf_rsp {
 293         __le16     scid;
 294         __le16     flags;
 295         __le16     result;
 296         __u8       data[0];
 297 } __packed;
 298
 299 #define L2CAP_CONF_SUCCESS      0x0000
 300 #define L2CAP_CONF_UNACCEPT     0x0001
 301 #define L2CAP_CONF_REJECT       0x0002
 302 #define L2CAP_CONF_UNKNOWN      0x0003
 303 #define L2CAP_CONF_PENDING      0x0004
 304 #define L2CAP_CONF_EFS_REJECT   0x0005
 305
 306 /* configuration req/rsp continuation flag */
 307 #define L2CAP_CONF_FLAG_CONTINUATION    0x0001
 308
 309 struct l2cap_conf_opt {
 310         __u8       type;
 311         __u8       len;
 312         __u8       val[0];
 313 } __packed;
 314 #define L2CAP_CONF_OPT_SIZE     2
 315
 316 #define L2CAP_CONF_HINT         0x80
 317 #define L2CAP_CONF_MASK         0x7f
 318
 319 #define L2CAP_CONF_MTU          0x01
 320 #define L2CAP_CONF_FLUSH_TO     0x02
 321 #define L2CAP_CONF_QOS          0x03
 322 #define L2CAP_CONF_RFC          0x04
 323 #define L2CAP_CONF_FCS          0x05
 324 #define L2CAP_CONF_EFS          0x06
 325 #define L2CAP_CONF_EWS          0x07
 326
 327 #define L2CAP_CONF_MAX_SIZE     22
 328
 329 struct l2cap_conf_rfc {
 330         __u8       mode;
 331         __u8       txwin_size;
 332         __u8       max_transmit;
 333         __le16     retrans_timeout;
 334         __le16     monitor_timeout;
 335         __le16     max_pdu_size;
 336 } __packed;
 337
 338 #define L2CAP_MODE_BASIC        0x00
 339 #define L2CAP_MODE_RETRANS      0x01
 340 #define L2CAP_MODE_FLOWCTL      0x02
 341 #define L2CAP_MODE_ERTM         0x03
 342 #define L2CAP_MODE_STREAMING    0x04
 343
 344 /* Unlike the above this one doesn't actually map to anything that would
 345  * ever be sent over the air. Therefore, use a value that's unlikely to
 346  * ever be used in the BR/EDR configuration phase.
 347  */
 348 #define L2CAP_MODE_LE_FLOWCTL   0x80
 349
 350 struct l2cap_conf_efs {
 351         __u8    id;
 352         __u8    stype;
 353         __le16  msdu;
 354         __le32  sdu_itime;
 355         __le32  acc_lat;
 356         __le32  flush_to;
 357 } __packed;
 358
 359 #define L2CAP_SERV_NOTRAFIC     0x00
 360 #define L2CAP_SERV_BESTEFFORT   0x01
 361 #define L2CAP_SERV_GUARANTEED   0x02
 362
 363 #define L2CAP_BESTEFFORT_ID     0x01
 364
 365 struct l2cap_disconn_req {
 366         __le16     dcid;
 367         __le16     scid;
 368 } __packed;
 369
 370 struct l2cap_disconn_rsp {
 371         __le16     dcid;
 372         __le16     scid;
 373 } __packed;
 374
 375 struct l2cap_info_req {
 376         __le16      type;
 377 } __packed;
 378
 379 struct l2cap_info_rsp {
 380         __le16      type;
 381         __le16      result;
 382         __u8        data[0];
 383 } __packed;
 384
 385 struct l2cap_create_chan_req {
 386         __le16      psm;
 387         __le16      scid;
 388         __u8        amp_id;
 389 } __packed;
 390
 391 struct l2cap_create_chan_rsp {
 392         __le16      dcid;
 393         __le16      scid;
 394         __le16      result;
 395         __le16      status;
 396 } __packed;
 397
 398 struct l2cap_move_chan_req {
 399         __le16      icid;
 400         __u8        dest_amp_id;
 401 } __packed;
 402
 403 struct l2cap_move_chan_rsp {
 404         __le16      icid;
 405         __le16      result;
 406 } __packed;
 407
 408 #define L2CAP_MR_SUCCESS        0x0000
 409 #define L2CAP_MR_PEND           0x0001
 410 #define L2CAP_MR_BAD_ID         0x0002
 411 #define L2CAP_MR_SAME_ID        0x0003
 412 #define L2CAP_MR_NOT_SUPP       0x0004
 413 #define L2CAP_MR_COLLISION      0x0005
 414 #define L2CAP_MR_NOT_ALLOWED    0x0006
 415
 416 struct l2cap_move_chan_cfm {
 417         __le16      icid;
 418         __le16      result;
 419 } __packed;
 420
 421 #define L2CAP_MC_CONFIRMED      0x0000
 422 #define L2CAP_MC_UNCONFIRMED    0x0001
 423
 424 struct l2cap_move_chan_cfm_rsp {
 425         __le16      icid;
 426 } __packed;
 427
 428 /* info type */
 429 #define L2CAP_IT_CL_MTU         0x0001
 430 #define L2CAP_IT_FEAT_MASK      0x0002
 431 #define L2CAP_IT_FIXED_CHAN     0x0003
 432
 433 /* info result */
 434 #define L2CAP_IR_SUCCESS        0x0000
 435 #define L2CAP_IR_NOTSUPP        0x0001
 436
 437 struct l2cap_conn_param_update_req {
 438         __le16      min;
 439         __le16      max;
 440         __le16      latency;
 441         __le16      to_multiplier;
 442 } __packed;
 443
 444 struct l2cap_conn_param_update_rsp {
 445         __le16      result;
 446 } __packed;
 447
 448 /* Connection Parameters result */
 449 #define L2CAP_CONN_PARAM_ACCEPTED       0x0000
 450 #define L2CAP_CONN_PARAM_REJECTED       0x0001
 451
 452 #define L2CAP_LE_MAX_CREDITS            10
 453 #define L2CAP_LE_DEFAULT_MPS            230
 454
 455 struct l2cap_le_conn_req {
 456         __le16     psm;
 457         __le16     scid;
 458         __le16     mtu;
 459         __le16     mps;
 460         __le16     credits;
 461 } __packed;
 462
 463 struct l2cap_le_conn_rsp {
 464         __le16     dcid;
 465         __le16     mtu;
 466         __le16     mps;
 467         __le16     credits;
 468         __le16     result;
 469 } __packed;
 470
 471 struct l2cap_le_credits {
 472         __le16     cid;
 473         __le16     credits;
 474 } __packed;
 475
 476 /* ----- L2CAP channels and connections ----- */
 477 struct l2cap_seq_list {
 478         __u16   head;
 479         __u16   tail;
 480         __u16   mask;
 481         __u16   *list;
 482 };
 483
 484 #define L2CAP_SEQ_LIST_CLEAR    0xFFFF
 485 #define L2CAP_SEQ_LIST_TAIL     0x8000
 486
 487 struct l2cap_chan {
 488         struct l2cap_conn       *conn;
 489         struct hci_conn         *hs_hcon;
 490         struct hci_chan         *hs_hchan;
 491         struct kref     kref;
 492         atomic_t        nesting;
 493
 494         __u8            state;
 495
 496         bdaddr_t        dst;
 497         __u8            dst_type;
 498         bdaddr_t        src;
 499         __u8            src_type;
 500         __le16          psm;
 501         __le16          sport;
 502         __u16           dcid;
 503         __u16           scid;
 504
 505         __u16           imtu;
 506         __u16           omtu;
 507         __u16           flush_to;
 508         __u8            mode;
 509         __u8            chan_type;
 510         __u8            chan_policy;
 511
 512         __u8            sec_level;
 513
 514         __u8            ident;
 515
 516         __u8            conf_req[64];
 517         __u8            conf_len;
 518         __u8            num_conf_req;
 519         __u8            num_conf_rsp;
 520
 521         __u8            fcs;
 522
 523         __u16           tx_win;
 524         __u16           tx_win_max;
 525         __u16           ack_win;
 526         __u8            max_tx;
 527         __u16           retrans_timeout;
 528         __u16           monitor_timeout;
 529         __u16           mps;
 530
 531         __u16           tx_credits;
 532         __u16           rx_credits;
 533
 534         __u8            tx_state;
 535         __u8            rx_state;
 536
 537         unsigned long   conf_state;
 538         unsigned long   conn_state;
 539         unsigned long   flags;
 540
 541         __u8            remote_amp_id;
 542         __u8            local_amp_id;
 543         __u8            move_id;
 544         __u8            move_state;
 545         __u8            move_role;
 546
 547         __u16           next_tx_seq;
 548         __u16           expected_ack_seq;
 549         __u16           expected_tx_seq;
 550         __u16           buffer_seq;
 551         __u16           srej_save_reqseq;
 552         __u16           last_acked_seq;
 553         __u16           frames_sent;
 554         __u16           unacked_frames;
 555         __u8            retry_count;
 556         __u16           sdu_len;
 557         struct sk_buff  *sdu;
 558         struct sk_buff  *sdu_last_frag;
 559
 560         __u16           remote_tx_win;
 561         __u8            remote_max_tx;
 562         __u16           remote_mps;
 563
 564         __u8            local_id;
 565         __u8            local_stype;
 566         __u16           local_msdu;
 567         __u32           local_sdu_itime;
 568         __u32           local_acc_lat;
 569         __u32           local_flush_to;
 570
 571         __u8            remote_id;
 572         __u8            remote_stype;
 573         __u16           remote_msdu;
 574         __u32           remote_sdu_itime;
 575         __u32           remote_acc_lat;
 576         __u32           remote_flush_to;
 577
 578         struct delayed_work     chan_timer;
 579         struct delayed_work     retrans_timer;
 580         struct delayed_work     monitor_timer;
 581         struct delayed_work     ack_timer;
 582
 583         struct sk_buff          *tx_send_head;
 584         struct sk_buff_head     tx_q;
 585         struct sk_buff_head     srej_q;
 586         struct l2cap_seq_list   srej_list;
 587         struct l2cap_seq_list   retrans_list;
 588
 589         struct list_head        list;
 590         struct list_head        global_l;
 591
 592         void                    *data;
 593         const struct l2cap_ops  *ops;
 594         struct mutex            lock;
 595 };
 596
 597 struct l2cap_ops {
 598         char                    *name;
 599
 600         struct l2cap_chan       *(*new_connection) (struct l2cap_chan *chan);
 601         int                     (*recv) (struct l2cap_chan * chan,
 602                                          struct sk_buff *skb);
 603         void                    (*teardown) (struct l2cap_chan *chan, int err);
 604         void                    (*close) (struct l2cap_chan *chan);
 605         void                    (*state_change) (struct l2cap_chan *chan,
 606                                                  int state, int err);
 607         void                    (*ready) (struct l2cap_chan *chan);
 608         void                    (*defer) (struct l2cap_chan *chan);
 609         void                    (*resume) (struct l2cap_chan *chan);
 610         void                    (*suspend) (struct l2cap_chan *chan);
 611         void                    (*set_shutdown) (struct l2cap_chan *chan);
 612         long                    (*get_sndtimeo) (struct l2cap_chan *chan);
 613         struct sk_buff          *(*alloc_skb) (struct l2cap_chan *chan,
 614                                                unsigned long hdr_len,
 615                                                unsigned long len, int nb);
 616 };
 617
 618 struct l2cap_conn {
 619         struct hci_conn         *hcon;
 620         struct hci_chan         *hchan;
 621
 622         unsigned int            mtu;
 623
 624         __u32                   feat_mask;
 625         __u8                    remote_fixed_chan;
 626         __u8                    local_fixed_chan;
 627
 628         __u8                    info_state;
 629         __u8                    info_ident;
 630
 631         struct delayed_work     info_timer;
 632
 633         struct sk_buff          *rx_skb;
 634         __u32                   rx_len;
 635         __u8                    tx_ident;
 636         struct mutex            ident_lock;
 637
 638         struct sk_buff_head     pending_rx;
 639         struct work_struct      pending_rx_work;
 640
 641         struct work_struct      id_addr_update_work;
 642
 643         __u8                    disc_reason;
 644
 645         struct l2cap_chan       *smp;
 646
 647         struct list_head        chan_l;
 648         struct mutex            chan_lock;
 649         struct kref             ref;
 650         struct list_head        users;
 651 };
 652
 653 struct l2cap_user {
 654         struct list_head list;
 655         int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
 656         void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
 657 };
 658
 659 #define L2CAP_INFO_CL_MTU_REQ_SENT      0x01
 660 #define L2CAP_INFO_FEAT_MASK_REQ_SENT   0x04
 661 #define L2CAP_INFO_FEAT_MASK_REQ_DONE   0x08
 662
 663 #define L2CAP_CHAN_RAW                  1
 664 #define L2CAP_CHAN_CONN_LESS            2
 665 #define L2CAP_CHAN_CONN_ORIENTED        3
 666 #define L2CAP_CHAN_FIXED                4
 667
 668 /* ----- L2CAP socket info ----- */
 669 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 670
 671 struct l2cap_pinfo {
 672         struct bt_sock          bt;
 673         struct l2cap_chan       *chan;
 674         struct sk_buff          *rx_busy_skb;
 675 };
 676
 677 enum {
 678         CONF_REQ_SENT,
 679         CONF_INPUT_DONE,
 680         CONF_OUTPUT_DONE,
 681         CONF_MTU_DONE,
 682         CONF_MODE_DONE,
 683         CONF_CONNECT_PEND,
 684         CONF_RECV_NO_FCS,
 685         CONF_STATE2_DEVICE,
 686         CONF_EWS_RECV,
 687         CONF_LOC_CONF_PEND,
 688         CONF_REM_CONF_PEND,
 689         CONF_NOT_COMPLETE,
 690 };
 691
 692 #define L2CAP_CONF_MAX_CONF_REQ 2
 693 #define L2CAP_CONF_MAX_CONF_RSP 2
 694
 695 enum {
 696         CONN_SREJ_SENT,
 697         CONN_WAIT_F,
 698         CONN_SREJ_ACT,
 699         CONN_SEND_PBIT,
 700         CONN_REMOTE_BUSY,
 701         CONN_LOCAL_BUSY,
 702         CONN_REJ_ACT,
 703         CONN_SEND_FBIT,
 704         CONN_RNR_SENT,
 705 };
 706
 707 /* Definitions for flags in l2cap_chan */
 708 enum {
 709         FLAG_ROLE_SWITCH,
 710         FLAG_FORCE_ACTIVE,
 711         FLAG_FORCE_RELIABLE,
 712         FLAG_FLUSHABLE,
 713         FLAG_EXT_CTRL,
 714         FLAG_EFS_ENABLE,
 715         FLAG_DEFER_SETUP,
 716         FLAG_LE_CONN_REQ_SENT,
 717         FLAG_PENDING_SECURITY,
 718         FLAG_HOLD_HCI_CONN,
 719 };
 720
 721 /* Lock nesting levels for L2CAP channels. We need these because lockdep
 722  * otherwise considers all channels equal and will e.g. complain about a
 723  * connection oriented channel triggering SMP procedures or a listening
 724  * channel creating and locking a child channel.
 725  */
 726 enum {
 727         L2CAP_NESTING_SMP,
 728         L2CAP_NESTING_NORMAL,
 729         L2CAP_NESTING_PARENT,
 730 };
 731
 732 enum {
 733         L2CAP_TX_STATE_XMIT,
 734         L2CAP_TX_STATE_WAIT_F,
 735 };
 736
 737 enum {
 738         L2CAP_RX_STATE_RECV,
 739         L2CAP_RX_STATE_SREJ_SENT,
 740         L2CAP_RX_STATE_MOVE,
 741         L2CAP_RX_STATE_WAIT_P,
 742         L2CAP_RX_STATE_WAIT_F,
 743 };
 744
 745 enum {
 746         L2CAP_TXSEQ_EXPECTED,
 747         L2CAP_TXSEQ_EXPECTED_SREJ,
 748         L2CAP_TXSEQ_UNEXPECTED,
 749         L2CAP_TXSEQ_UNEXPECTED_SREJ,
 750         L2CAP_TXSEQ_DUPLICATE,
 751         L2CAP_TXSEQ_DUPLICATE_SREJ,
 752         L2CAP_TXSEQ_INVALID,
 753         L2CAP_TXSEQ_INVALID_IGNORE,
 754 };
 755
 756 enum {
 757         L2CAP_EV_DATA_REQUEST,
 758         L2CAP_EV_LOCAL_BUSY_DETECTED,
 759         L2CAP_EV_LOCAL_BUSY_CLEAR,
 760         L2CAP_EV_RECV_REQSEQ_AND_FBIT,
 761         L2CAP_EV_RECV_FBIT,
 762         L2CAP_EV_RETRANS_TO,
 763         L2CAP_EV_MONITOR_TO,
 764         L2CAP_EV_EXPLICIT_POLL,
 765         L2CAP_EV_RECV_IFRAME,
 766         L2CAP_EV_RECV_RR,
 767         L2CAP_EV_RECV_REJ,
 768         L2CAP_EV_RECV_RNR,
 769         L2CAP_EV_RECV_SREJ,
 770         L2CAP_EV_RECV_FRAME,
 771 };
 772
 773 enum {
 774         L2CAP_MOVE_ROLE_NONE,
 775         L2CAP_MOVE_ROLE_INITIATOR,
 776         L2CAP_MOVE_ROLE_RESPONDER,
 777 };
 778
 779 enum {
 780         L2CAP_MOVE_STABLE,
 781         L2CAP_MOVE_WAIT_REQ,
 782         L2CAP_MOVE_WAIT_RSP,
 783         L2CAP_MOVE_WAIT_RSP_SUCCESS,
 784         L2CAP_MOVE_WAIT_CONFIRM,
 785         L2CAP_MOVE_WAIT_CONFIRM_RSP,
 786         L2CAP_MOVE_WAIT_LOGICAL_COMP,
 787         L2CAP_MOVE_WAIT_LOGICAL_CFM,
 788         L2CAP_MOVE_WAIT_LOCAL_BUSY,
 789         L2CAP_MOVE_WAIT_PREPARE,
 790 };
 791
 792 void l2cap_chan_hold(struct l2cap_chan *c);
 793 void l2cap_chan_put(struct l2cap_chan *c);
 794
 795 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
 796 {
 797         mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
 798 }
 799
 800 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
 801 {
 802         mutex_unlock(&chan->lock);
 803 }
 804
 805 static inline void l2cap_set_timer(struct l2cap_chan *chan,
 806                                    struct delayed_work *work, long timeout)
 807 {
 808         BT_DBG("chan %p state %s timeout %ld", chan,
 809                state_to_string(chan->state), timeout);
 810
 811         /* If delayed work cancelled do not hold(chan)
 812            since it is already done with previous set_timer */
 813         if (!cancel_delayed_work(work))
 814                 l2cap_chan_hold(chan);
 815
 816         schedule_delayed_work(work, timeout);
 817 }
 818
 819 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
 820                                      struct delayed_work *work)
 821 {
 822         bool ret;
 823
 824         /* put(chan) if delayed work cancelled otherwise it
 825            is done in delayed work function */
 826         ret = cancel_delayed_work(work);
 827         if (ret)
 828                 l2cap_chan_put(chan);
 829
 830         return ret;
 831 }
 832
 833 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
 834 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
 835 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
 836 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
 837 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
 838                 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
 839 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
 840
 841 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
 842 {
 843         if (seq1 >= seq2)
 844                 return seq1 - seq2;
 845         else
 846                 return chan->tx_win_max + 1 - seq2 + seq1;
 847 }
 848
 849 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
 850 {
 851         return (seq + 1) % (chan->tx_win_max + 1);
 852 }
 853
 854 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
 855 {
 856         return NULL;
 857 }
 858
 859 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
 860 {
 861         return -ENOSYS;
 862 }
 863
 864 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
 865                                                       unsigned long hdr_len,
 866                                                       unsigned long len, int nb)
 867 {
 868         return ERR_PTR(-ENOSYS);
 869 }
 870
 871 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
 872 {
 873 }
 874
 875 static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
 876 {
 877 }
 878
 879 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
 880 {
 881 }
 882
 883 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
 884                                               int state, int err)
 885 {
 886 }
 887
 888 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
 889 {
 890 }
 891
 892 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
 893 {
 894 }
 895
 896 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
 897 {
 898 }
 899
 900 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
 901 {
 902 }
 903
 904 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
 905 {
 906         return 0;
 907 }
 908
 909 extern bool disable_ertm;
 910
 911 int l2cap_init_sockets(void);
 912 void l2cap_cleanup_sockets(void);
 913 bool l2cap_is_socket(struct socket *sock);
 914
 915 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
 916 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
 917
 918 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
 919 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);
 920
 921 struct l2cap_chan *l2cap_chan_create(void);
 922 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
 923 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 924                        bdaddr_t *dst, u8 dst_type);
 925 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
 926 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
 927 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
 928 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
 929 int l2cap_ertm_init(struct l2cap_chan *chan);
 930 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
 931 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
 932 void l2cap_chan_del(struct l2cap_chan *chan, int err);
 933 void l2cap_send_conn_req(struct l2cap_chan *chan);
 934 void l2cap_move_start(struct l2cap_chan *chan);
 935 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
 936                        u8 status);
 937 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
 938
 939 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
 940 void l2cap_conn_put(struct l2cap_conn *conn);
 941
 942 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
 943 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
 944
 945 #endif /* __L2CAP_H */