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
  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_EFS_DEFAULT_FLUSH_TO      0xFFFFFFFF
  37 #define L2CAP_DEFAULT_TX_WINDOW         63
  38 #define L2CAP_DEFAULT_EXT_WINDOW        0x3FFF
  39 #define L2CAP_DEFAULT_MAX_TX            3
  40 #define L2CAP_DEFAULT_RETRANS_TO        2000    /* 2 seconds */
  41 #define L2CAP_DEFAULT_MONITOR_TO        12000   /* 12 seconds */
  42 #define L2CAP_DEFAULT_MAX_PDU_SIZE      1492    /* Sized for AMP packet */
  43 #define L2CAP_DEFAULT_ACK_TO            200
  44 #define L2CAP_DEFAULT_MAX_SDU_SIZE      0xFFFF
  45 #define L2CAP_DEFAULT_SDU_ITIME         0xFFFFFFFF
  46 #define L2CAP_DEFAULT_ACC_LAT           0xFFFFFFFF
  47 #define L2CAP_BREDR_MAX_PAYLOAD         1019    /* 3-DH5 packet */
  48 #define L2CAP_LE_MIN_MTU                23
  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
  58 #define L2CAP_A2MP_DEFAULT_MTU          670
  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_CREATE_CHAN_REQ   0x0c
 109 #define L2CAP_CREATE_CHAN_RSP   0x0d
 110 #define L2CAP_MOVE_CHAN_REQ     0x0e
 111 #define L2CAP_MOVE_CHAN_RSP     0x0f
 112 #define L2CAP_MOVE_CHAN_CFM     0x10
 113 #define L2CAP_MOVE_CHAN_CFM_RSP 0x11
 114 #define L2CAP_CONN_PARAM_UPDATE_REQ     0x12
 115 #define L2CAP_CONN_PARAM_UPDATE_RSP     0x13
 116 #define L2CAP_LE_CONN_REQ       0x14
 117 #define L2CAP_LE_CONN_RSP       0x15
 118 #define L2CAP_LE_CREDITS        0x16
 119
 120 /* L2CAP extended feature mask */
 121 #define L2CAP_FEAT_FLOWCTL      0x00000001
 122 #define L2CAP_FEAT_RETRANS      0x00000002
 123 #define L2CAP_FEAT_BIDIR_QOS    0x00000004
 124 #define L2CAP_FEAT_ERTM         0x00000008
 125 #define L2CAP_FEAT_STREAMING    0x00000010
 126 #define L2CAP_FEAT_FCS          0x00000020
 127 #define L2CAP_FEAT_EXT_FLOW     0x00000040
 128 #define L2CAP_FEAT_FIXED_CHAN   0x00000080
 129 #define L2CAP_FEAT_EXT_WINDOW   0x00000100
 130 #define L2CAP_FEAT_UCD          0x00000200
 131
 132 /* L2CAP checksum option */
 133 #define L2CAP_FCS_NONE          0x00
 134 #define L2CAP_FCS_CRC16         0x01
 135
 136 /* L2CAP fixed channels */
 137 #define L2CAP_FC_SIG_BREDR      0x02
 138 #define L2CAP_FC_CONNLESS       0x04
 139 #define L2CAP_FC_A2MP           0x08
 140 #define L2CAP_FC_ATT            0x10
 141 #define L2CAP_FC_SIG_LE         0x20
 142 #define L2CAP_FC_SMP_LE         0x40
 143
 144 /* L2CAP Control Field bit masks */
 145 #define L2CAP_CTRL_SAR                  0xC000
 146 #define L2CAP_CTRL_REQSEQ               0x3F00
 147 #define L2CAP_CTRL_TXSEQ                0x007E
 148 #define L2CAP_CTRL_SUPERVISE            0x000C
 149
 150 #define L2CAP_CTRL_RETRANS              0x0080
 151 #define L2CAP_CTRL_FINAL                0x0080
 152 #define L2CAP_CTRL_POLL                 0x0010
 153 #define L2CAP_CTRL_FRAME_TYPE           0x0001 /* I- or S-Frame */
 154
 155 #define L2CAP_CTRL_TXSEQ_SHIFT          1
 156 #define L2CAP_CTRL_SUPER_SHIFT          2
 157 #define L2CAP_CTRL_POLL_SHIFT           4
 158 #define L2CAP_CTRL_FINAL_SHIFT          7
 159 #define L2CAP_CTRL_REQSEQ_SHIFT         8
 160 #define L2CAP_CTRL_SAR_SHIFT            14
 161
 162 /* L2CAP Extended Control Field bit mask */
 163 #define L2CAP_EXT_CTRL_TXSEQ            0xFFFC0000
 164 #define L2CAP_EXT_CTRL_SAR              0x00030000
 165 #define L2CAP_EXT_CTRL_SUPERVISE        0x00030000
 166 #define L2CAP_EXT_CTRL_REQSEQ           0x0000FFFC
 167
 168 #define L2CAP_EXT_CTRL_POLL             0x00040000
 169 #define L2CAP_EXT_CTRL_FINAL            0x00000002
 170 #define L2CAP_EXT_CTRL_FRAME_TYPE       0x00000001 /* I- or S-Frame */
 171
 172 #define L2CAP_EXT_CTRL_FINAL_SHIFT      1
 173 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT     2
 174 #define L2CAP_EXT_CTRL_SAR_SHIFT        16
 175 #define L2CAP_EXT_CTRL_SUPER_SHIFT      16
 176 #define L2CAP_EXT_CTRL_POLL_SHIFT       18
 177 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT      18
 178
 179 /* L2CAP Supervisory Function */
 180 #define L2CAP_SUPER_RR          0x00
 181 #define L2CAP_SUPER_REJ         0x01
 182 #define L2CAP_SUPER_RNR         0x02
 183 #define L2CAP_SUPER_SREJ        0x03
 184
 185 /* L2CAP Segmentation and Reassembly */
 186 #define L2CAP_SAR_UNSEGMENTED   0x00
 187 #define L2CAP_SAR_START         0x01
 188 #define L2CAP_SAR_END           0x02
 189 #define L2CAP_SAR_CONTINUE      0x03
 190
 191 /* L2CAP Command rej. reasons */
 192 #define L2CAP_REJ_NOT_UNDERSTOOD        0x0000
 193 #define L2CAP_REJ_MTU_EXCEEDED          0x0001
 194 #define L2CAP_REJ_INVALID_CID           0x0002
 195
 196 /* L2CAP structures */
 197 struct l2cap_hdr {
 198         __le16     len;
 199         __le16     cid;
 200 } __packed;
 201 #define L2CAP_HDR_SIZE          4
 202 #define L2CAP_ENH_HDR_SIZE      6
 203 #define L2CAP_EXT_HDR_SIZE      8
 204
 205 #define L2CAP_FCS_SIZE          2
 206 #define L2CAP_SDULEN_SIZE       2
 207 #define L2CAP_PSMLEN_SIZE       2
 208 #define L2CAP_ENH_CTRL_SIZE     2
 209 #define L2CAP_EXT_CTRL_SIZE     4
 210
 211 struct l2cap_cmd_hdr {
 212         __u8       code;
 213         __u8       ident;
 214         __le16     len;
 215 } __packed;
 216 #define L2CAP_CMD_HDR_SIZE      4
 217
 218 struct l2cap_cmd_rej_unk {
 219         __le16     reason;
 220 } __packed;
 221
 222 struct l2cap_cmd_rej_mtu {
 223         __le16     reason;
 224         __le16     max_mtu;
 225 } __packed;
 226
 227 struct l2cap_cmd_rej_cid {
 228         __le16     reason;
 229         __le16     scid;
 230         __le16     dcid;
 231 } __packed;
 232
 233 struct l2cap_conn_req {
 234         __le16     psm;
 235         __le16     scid;
 236 } __packed;
 237
 238 struct l2cap_conn_rsp {
 239         __le16     dcid;
 240         __le16     scid;
 241         __le16     result;
 242         __le16     status;
 243 } __packed;
 244
 245 /* protocol/service multiplexer (PSM) */
 246 #define L2CAP_PSM_SDP           0x0001
 247 #define L2CAP_PSM_RFCOMM        0x0003
 248 #define L2CAP_PSM_3DSP          0x0021
 249
 250 /* channel identifier */
 251 #define L2CAP_CID_SIGNALING     0x0001
 252 #define L2CAP_CID_CONN_LESS     0x0002
 253 #define L2CAP_CID_A2MP          0x0003
 254 #define L2CAP_CID_ATT           0x0004
 255 #define L2CAP_CID_LE_SIGNALING  0x0005
 256 #define L2CAP_CID_SMP           0x0006
 257 #define L2CAP_CID_DYN_START     0x0040
 258 #define L2CAP_CID_DYN_END       0xffff
 259 #define L2CAP_CID_LE_DYN_END    0x007f
 260
 261 /* connect/create channel results */
 262 #define L2CAP_CR_SUCCESS        0x0000
 263 #define L2CAP_CR_PEND           0x0001
 264 #define L2CAP_CR_BAD_PSM        0x0002
 265 #define L2CAP_CR_SEC_BLOCK      0x0003
 266 #define L2CAP_CR_NO_MEM         0x0004
 267 #define L2CAP_CR_BAD_AMP        0x0005
 268 #define L2CAP_CR_AUTHENTICATION 0x0005
 269 #define L2CAP_CR_AUTHORIZATION  0x0006
 270 #define L2CAP_CR_BAD_KEY_SIZE   0x0007
 271 #define L2CAP_CR_ENCRYPTION     0x0008
 272
 273 /* connect/create channel status */
 274 #define L2CAP_CS_NO_INFO        0x0000
 275 #define L2CAP_CS_AUTHEN_PEND    0x0001
 276 #define L2CAP_CS_AUTHOR_PEND    0x0002
 277
 278 struct l2cap_conf_req {
 279         __le16     dcid;
 280         __le16     flags;
 281         __u8       data[0];
 282 } __packed;
 283
 284 struct l2cap_conf_rsp {
 285         __le16     scid;
 286         __le16     flags;
 287         __le16     result;
 288         __u8       data[0];
 289 } __packed;
 290
 291 #define L2CAP_CONF_SUCCESS      0x0000
 292 #define L2CAP_CONF_UNACCEPT     0x0001
 293 #define L2CAP_CONF_REJECT       0x0002
 294 #define L2CAP_CONF_UNKNOWN      0x0003
 295 #define L2CAP_CONF_PENDING      0x0004
 296 #define L2CAP_CONF_EFS_REJECT   0x0005
 297
 298 /* configuration req/rsp continuation flag */
 299 #define L2CAP_CONF_FLAG_CONTINUATION    0x0001
 300
 301 struct l2cap_conf_opt {
 302         __u8       type;
 303         __u8       len;
 304         __u8       val[0];
 305 } __packed;
 306 #define L2CAP_CONF_OPT_SIZE     2
 307
 308 #define L2CAP_CONF_HINT         0x80
 309 #define L2CAP_CONF_MASK         0x7f
 310
 311 #define L2CAP_CONF_MTU          0x01
 312 #define L2CAP_CONF_FLUSH_TO     0x02
 313 #define L2CAP_CONF_QOS          0x03
 314 #define L2CAP_CONF_RFC          0x04
 315 #define L2CAP_CONF_FCS          0x05
 316 #define L2CAP_CONF_EFS          0x06
 317 #define L2CAP_CONF_EWS          0x07
 318
 319 #define L2CAP_CONF_MAX_SIZE     22
 320
 321 struct l2cap_conf_rfc {
 322         __u8       mode;
 323         __u8       txwin_size;
 324         __u8       max_transmit;
 325         __le16     retrans_timeout;
 326         __le16     monitor_timeout;
 327         __le16     max_pdu_size;
 328 } __packed;
 329
 330 #define L2CAP_MODE_BASIC        0x00
 331 #define L2CAP_MODE_RETRANS      0x01
 332 #define L2CAP_MODE_FLOWCTL      0x02
 333 #define L2CAP_MODE_ERTM         0x03
 334 #define L2CAP_MODE_STREAMING    0x04
 335
 336 /* Unlike the above this one doesn't actually map to anything that would
 337  * ever be sent over the air. Therefore, use a value that's unlikely to
 338  * ever be used in the BR/EDR configuration phase.
 339  */
 340 #define L2CAP_MODE_LE_FLOWCTL   0x80
 341
 342 struct l2cap_conf_efs {
 343         __u8    id;
 344         __u8    stype;
 345         __le16  msdu;
 346         __le32  sdu_itime;
 347         __le32  acc_lat;
 348         __le32  flush_to;
 349 } __packed;
 350
 351 #define L2CAP_SERV_NOTRAFIC     0x00
 352 #define L2CAP_SERV_BESTEFFORT   0x01
 353 #define L2CAP_SERV_GUARANTEED   0x02
 354
 355 #define L2CAP_BESTEFFORT_ID     0x01
 356
 357 struct l2cap_disconn_req {
 358         __le16     dcid;
 359         __le16     scid;
 360 } __packed;
 361
 362 struct l2cap_disconn_rsp {
 363         __le16     dcid;
 364         __le16     scid;
 365 } __packed;
 366
 367 struct l2cap_info_req {
 368         __le16      type;
 369 } __packed;
 370
 371 struct l2cap_info_rsp {
 372         __le16      type;
 373         __le16      result;
 374         __u8        data[0];
 375 } __packed;
 376
 377 struct l2cap_create_chan_req {
 378         __le16      psm;
 379         __le16      scid;
 380         __u8        amp_id;
 381 } __packed;
 382
 383 struct l2cap_create_chan_rsp {
 384         __le16      dcid;
 385         __le16      scid;
 386         __le16      result;
 387         __le16      status;
 388 } __packed;
 389
 390 struct l2cap_move_chan_req {
 391         __le16      icid;
 392         __u8        dest_amp_id;
 393 } __packed;
 394
 395 struct l2cap_move_chan_rsp {
 396         __le16      icid;
 397         __le16      result;
 398 } __packed;
 399
 400 #define L2CAP_MR_SUCCESS        0x0000
 401 #define L2CAP_MR_PEND           0x0001
 402 #define L2CAP_MR_BAD_ID         0x0002
 403 #define L2CAP_MR_SAME_ID        0x0003
 404 #define L2CAP_MR_NOT_SUPP       0x0004
 405 #define L2CAP_MR_COLLISION      0x0005
 406 #define L2CAP_MR_NOT_ALLOWED    0x0006
 407
 408 struct l2cap_move_chan_cfm {
 409         __le16      icid;
 410         __le16      result;
 411 } __packed;
 412
 413 #define L2CAP_MC_CONFIRMED      0x0000
 414 #define L2CAP_MC_UNCONFIRMED    0x0001
 415
 416 struct l2cap_move_chan_cfm_rsp {
 417         __le16      icid;
 418 } __packed;
 419
 420 /* info type */
 421 #define L2CAP_IT_CL_MTU         0x0001
 422 #define L2CAP_IT_FEAT_MASK      0x0002
 423 #define L2CAP_IT_FIXED_CHAN     0x0003
 424
 425 /* info result */
 426 #define L2CAP_IR_SUCCESS        0x0000
 427 #define L2CAP_IR_NOTSUPP        0x0001
 428
 429 struct l2cap_conn_param_update_req {
 430         __le16      min;
 431         __le16      max;
 432         __le16      latency;
 433         __le16      to_multiplier;
 434 } __packed;
 435
 436 struct l2cap_conn_param_update_rsp {
 437         __le16      result;
 438 } __packed;
 439
 440 /* Connection Parameters result */
 441 #define L2CAP_CONN_PARAM_ACCEPTED       0x0000
 442 #define L2CAP_CONN_PARAM_REJECTED       0x0001
 443
 444 #define L2CAP_LE_MAX_CREDITS            10
 445 #define L2CAP_LE_DEFAULT_MPS            230
 446
 447 struct l2cap_le_conn_req {
 448         __le16     psm;
 449         __le16     scid;
 450         __le16     mtu;
 451         __le16     mps;
 452         __le16     credits;
 453 } __packed;
 454
 455 struct l2cap_le_conn_rsp {
 456         __le16     dcid;
 457         __le16     mtu;
 458         __le16     mps;
 459         __le16     credits;
 460         __le16     result;
 461 } __packed;
 462
 463 struct l2cap_le_credits {
 464         __le16     cid;
 465         __le16     credits;
 466 } __packed;
 467
 468 /* ----- L2CAP channels and connections ----- */
 469 struct l2cap_seq_list {
 470         __u16   head;
 471         __u16   tail;
 472         __u16   mask;
 473         __u16   *list;
 474 };
 475
 476 #define L2CAP_SEQ_LIST_CLEAR    0xFFFF
 477 #define L2CAP_SEQ_LIST_TAIL     0x8000
 478
 479 struct l2cap_chan {
 480         struct l2cap_conn       *conn;
 481         struct hci_conn         *hs_hcon;
 482         struct hci_chan         *hs_hchan;
 483         struct kref     kref;
 484
 485         __u8            state;
 486
 487         bdaddr_t        dst;
 488         __u8            dst_type;
 489         bdaddr_t        src;
 490         __u8            src_type;
 491         __le16          psm;
 492         __le16          sport;
 493         __u16           dcid;
 494         __u16           scid;
 495
 496         __u16           imtu;
 497         __u16           omtu;
 498         __u16           flush_to;
 499         __u8            mode;
 500         __u8            chan_type;
 501         __u8            chan_policy;
 502
 503         __u8            sec_level;
 504
 505         __u8            ident;
 506
 507         __u8            conf_req[64];
 508         __u8            conf_len;
 509         __u8            num_conf_req;
 510         __u8            num_conf_rsp;
 511
 512         __u8            fcs;
 513
 514         __u16           tx_win;
 515         __u16           tx_win_max;
 516         __u16           ack_win;
 517         __u8            max_tx;
 518         __u16           retrans_timeout;
 519         __u16           monitor_timeout;
 520         __u16           mps;
 521
 522         __u16           tx_credits;
 523         __u16           rx_credits;
 524
 525         __u8            tx_state;
 526         __u8            rx_state;
 527
 528         unsigned long   conf_state;
 529         unsigned long   conn_state;
 530         unsigned long   flags;
 531
 532         __u8            remote_amp_id;
 533         __u8            local_amp_id;
 534         __u8            move_id;
 535         __u8            move_state;
 536         __u8            move_role;
 537
 538         __u16           next_tx_seq;
 539         __u16           expected_ack_seq;
 540         __u16           expected_tx_seq;
 541         __u16           buffer_seq;
 542         __u16           srej_save_reqseq;
 543         __u16           last_acked_seq;
 544         __u16           frames_sent;
 545         __u16           unacked_frames;
 546         __u8            retry_count;
 547         __u16           sdu_len;
 548         struct sk_buff  *sdu;
 549         struct sk_buff  *sdu_last_frag;
 550
 551         __u16           remote_tx_win;
 552         __u8            remote_max_tx;
 553         __u16           remote_mps;
 554
 555         __u8            local_id;
 556         __u8            local_stype;
 557         __u16           local_msdu;
 558         __u32           local_sdu_itime;
 559         __u32           local_acc_lat;
 560         __u32           local_flush_to;
 561
 562         __u8            remote_id;
 563         __u8            remote_stype;
 564         __u16           remote_msdu;
 565         __u32           remote_sdu_itime;
 566         __u32           remote_acc_lat;
 567         __u32           remote_flush_to;
 568
 569         struct delayed_work     chan_timer;
 570         struct delayed_work     retrans_timer;
 571         struct delayed_work     monitor_timer;
 572         struct delayed_work     ack_timer;
 573
 574         struct sk_buff          *tx_send_head;
 575         struct sk_buff_head     tx_q;
 576         struct sk_buff_head     srej_q;
 577         struct l2cap_seq_list   srej_list;
 578         struct l2cap_seq_list   retrans_list;
 579
 580         struct list_head        list;
 581         struct list_head        global_l;
 582
 583         void                    *data;
 584         const struct l2cap_ops  *ops;
 585         struct mutex            lock;
 586 };
 587
 588 struct l2cap_ops {
 589         char                    *name;
 590
 591         struct l2cap_chan       *(*new_connection) (struct l2cap_chan *chan);
 592         int                     (*recv) (struct l2cap_chan * chan,
 593                                          struct sk_buff *skb);
 594         void                    (*teardown) (struct l2cap_chan *chan, int err);
 595         void                    (*close) (struct l2cap_chan *chan);
 596         void                    (*state_change) (struct l2cap_chan *chan,
 597                                                  int state, int err);
 598         void                    (*ready) (struct l2cap_chan *chan);
 599         void                    (*defer) (struct l2cap_chan *chan);
 600         void                    (*resume) (struct l2cap_chan *chan);
 601         void                    (*suspend) (struct l2cap_chan *chan);
 602         void                    (*set_shutdown) (struct l2cap_chan *chan);
 603         long                    (*get_sndtimeo) (struct l2cap_chan *chan);
 604         struct sk_buff          *(*alloc_skb) (struct l2cap_chan *chan,
 605                                                unsigned long hdr_len,
 606                                                unsigned long len, int nb);
 607         int                     (*memcpy_fromiovec) (struct l2cap_chan *chan,
 608                                                      unsigned char *kdata,
 609                                                      struct iovec *iov,
 610                                                      int len);
 611 };
 612
 613 struct l2cap_conn {
 614         struct hci_conn         *hcon;
 615         struct hci_chan         *hchan;
 616
 617         unsigned int            mtu;
 618
 619         __u32                   feat_mask;
 620         __u8                    fixed_chan_mask;
 621         bool                    hs_enabled;
 622
 623         __u8                    info_state;
 624         __u8                    info_ident;
 625
 626         struct delayed_work     info_timer;
 627
 628         struct sk_buff          *rx_skb;
 629         __u32                   rx_len;
 630         __u8                    tx_ident;
 631         struct mutex            ident_lock;
 632
 633         struct sk_buff_head     pending_rx;
 634         struct work_struct      pending_rx_work;
 635
 636         struct work_struct      id_addr_update_work;
 637
 638         __u8                    disc_reason;
 639
 640         struct l2cap_chan       *smp;
 641
 642         struct list_head        chan_l;
 643         struct mutex            chan_lock;
 644         struct kref             ref;
 645         struct list_head        users;
 646 };
 647
 648 struct l2cap_user {
 649         struct list_head list;
 650         int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
 651         void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
 652 };
 653
 654 #define L2CAP_INFO_CL_MTU_REQ_SENT      0x01
 655 #define L2CAP_INFO_FEAT_MASK_REQ_SENT   0x04
 656 #define L2CAP_INFO_FEAT_MASK_REQ_DONE   0x08
 657
 658 #define L2CAP_CHAN_RAW                  1
 659 #define L2CAP_CHAN_CONN_LESS            2
 660 #define L2CAP_CHAN_CONN_ORIENTED        3
 661 #define L2CAP_CHAN_FIXED                4
 662
 663 /* ----- L2CAP socket info ----- */
 664 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 665
 666 struct l2cap_pinfo {
 667         struct bt_sock          bt;
 668         struct l2cap_chan       *chan;
 669         struct sk_buff          *rx_busy_skb;
 670 };
 671
 672 enum {
 673         CONF_REQ_SENT,
 674         CONF_INPUT_DONE,
 675         CONF_OUTPUT_DONE,
 676         CONF_MTU_DONE,
 677         CONF_MODE_DONE,
 678         CONF_CONNECT_PEND,
 679         CONF_RECV_NO_FCS,
 680         CONF_STATE2_DEVICE,
 681         CONF_EWS_RECV,
 682         CONF_LOC_CONF_PEND,
 683         CONF_REM_CONF_PEND,
 684         CONF_NOT_COMPLETE,
 685 };
 686
 687 #define L2CAP_CONF_MAX_CONF_REQ 2
 688 #define L2CAP_CONF_MAX_CONF_RSP 2
 689
 690 enum {
 691         CONN_SREJ_SENT,
 692         CONN_WAIT_F,
 693         CONN_SREJ_ACT,
 694         CONN_SEND_PBIT,
 695         CONN_REMOTE_BUSY,
 696         CONN_LOCAL_BUSY,
 697         CONN_REJ_ACT,
 698         CONN_SEND_FBIT,
 699         CONN_RNR_SENT,
 700 };
 701
 702 /* Definitions for flags in l2cap_chan */
 703 enum {
 704         FLAG_ROLE_SWITCH,
 705         FLAG_FORCE_ACTIVE,
 706         FLAG_FORCE_RELIABLE,
 707         FLAG_FLUSHABLE,
 708         FLAG_EXT_CTRL,
 709         FLAG_EFS_ENABLE,
 710         FLAG_DEFER_SETUP,
 711         FLAG_LE_CONN_REQ_SENT,
 712         FLAG_PENDING_SECURITY,
 713         FLAG_HOLD_HCI_CONN,
 714 };
 715
 716 enum {
 717         L2CAP_TX_STATE_XMIT,
 718         L2CAP_TX_STATE_WAIT_F,
 719 };
 720
 721 enum {
 722         L2CAP_RX_STATE_RECV,
 723         L2CAP_RX_STATE_SREJ_SENT,
 724         L2CAP_RX_STATE_MOVE,
 725         L2CAP_RX_STATE_WAIT_P,
 726         L2CAP_RX_STATE_WAIT_F,
 727 };
 728
 729 enum {
 730         L2CAP_TXSEQ_EXPECTED,
 731         L2CAP_TXSEQ_EXPECTED_SREJ,
 732         L2CAP_TXSEQ_UNEXPECTED,
 733         L2CAP_TXSEQ_UNEXPECTED_SREJ,
 734         L2CAP_TXSEQ_DUPLICATE,
 735         L2CAP_TXSEQ_DUPLICATE_SREJ,
 736         L2CAP_TXSEQ_INVALID,
 737         L2CAP_TXSEQ_INVALID_IGNORE,
 738 };
 739
 740 enum {
 741         L2CAP_EV_DATA_REQUEST,
 742         L2CAP_EV_LOCAL_BUSY_DETECTED,
 743         L2CAP_EV_LOCAL_BUSY_CLEAR,
 744         L2CAP_EV_RECV_REQSEQ_AND_FBIT,
 745         L2CAP_EV_RECV_FBIT,
 746         L2CAP_EV_RETRANS_TO,
 747         L2CAP_EV_MONITOR_TO,
 748         L2CAP_EV_EXPLICIT_POLL,
 749         L2CAP_EV_RECV_IFRAME,
 750         L2CAP_EV_RECV_RR,
 751         L2CAP_EV_RECV_REJ,
 752         L2CAP_EV_RECV_RNR,
 753         L2CAP_EV_RECV_SREJ,
 754         L2CAP_EV_RECV_FRAME,
 755 };
 756
 757 enum {
 758         L2CAP_MOVE_ROLE_NONE,
 759         L2CAP_MOVE_ROLE_INITIATOR,
 760         L2CAP_MOVE_ROLE_RESPONDER,
 761 };
 762
 763 enum {
 764         L2CAP_MOVE_STABLE,
 765         L2CAP_MOVE_WAIT_REQ,
 766         L2CAP_MOVE_WAIT_RSP,
 767         L2CAP_MOVE_WAIT_RSP_SUCCESS,
 768         L2CAP_MOVE_WAIT_CONFIRM,
 769         L2CAP_MOVE_WAIT_CONFIRM_RSP,
 770         L2CAP_MOVE_WAIT_LOGICAL_COMP,
 771         L2CAP_MOVE_WAIT_LOGICAL_CFM,
 772         L2CAP_MOVE_WAIT_LOCAL_BUSY,
 773         L2CAP_MOVE_WAIT_PREPARE,
 774 };
 775
 776 void l2cap_chan_hold(struct l2cap_chan *c);
 777 void l2cap_chan_put(struct l2cap_chan *c);
 778
 779 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
 780 {
 781         mutex_lock(&chan->lock);
 782 }
 783
 784 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
 785 {
 786         mutex_unlock(&chan->lock);
 787 }
 788
 789 static inline void l2cap_set_timer(struct l2cap_chan *chan,
 790                                    struct delayed_work *work, long timeout)
 791 {
 792         BT_DBG("chan %p state %s timeout %ld", chan,
 793                state_to_string(chan->state), timeout);
 794
 795         /* If delayed work cancelled do not hold(chan)
 796            since it is already done with previous set_timer */
 797         if (!cancel_delayed_work(work))
 798                 l2cap_chan_hold(chan);
 799
 800         schedule_delayed_work(work, timeout);
 801 }
 802
 803 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
 804                                      struct delayed_work *work)
 805 {
 806         bool ret;
 807
 808         /* put(chan) if delayed work cancelled otherwise it
 809            is done in delayed work function */
 810         ret = cancel_delayed_work(work);
 811         if (ret)
 812                 l2cap_chan_put(chan);
 813
 814         return ret;
 815 }
 816
 817 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
 818 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
 819 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
 820 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
 821 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
 822                 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
 823 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
 824
 825 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
 826 {
 827         if (seq1 >= seq2)
 828                 return seq1 - seq2;
 829         else
 830                 return chan->tx_win_max + 1 - seq2 + seq1;
 831 }
 832
 833 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
 834 {
 835         return (seq + 1) % (chan->tx_win_max + 1);
 836 }
 837
 838 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
 839 {
 840         return NULL;
 841 }
 842
 843 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
 844 {
 845         return -ENOSYS;
 846 }
 847
 848 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
 849                                                       unsigned long hdr_len,
 850                                                       unsigned long len, int nb)
 851 {
 852         return ERR_PTR(-ENOSYS);
 853 }
 854
 855 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
 856 {
 857 }
 858
 859 static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
 860 {
 861 }
 862
 863 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
 864 {
 865 }
 866
 867 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
 868                                               int state, int err)
 869 {
 870 }
 871
 872 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
 873 {
 874 }
 875
 876 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
 877 {
 878 }
 879
 880 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
 881 {
 882 }
 883
 884 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
 885 {
 886 }
 887
 888 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
 889 {
 890         return 0;
 891 }
 892
 893 static inline int l2cap_chan_no_memcpy_fromiovec(struct l2cap_chan *chan,
 894                                                  unsigned char *kdata,
 895                                                  struct iovec *iov,
 896                                                  int len)
 897 {
 898         /* Following is safe since for compiler definitions of kvec and
 899          * iovec are identical, yielding the same in-core layout and alignment
 900          */
 901         struct kvec *vec = (struct kvec *)iov;
 902
 903         while (len > 0) {
 904                 if (vec->iov_len) {
 905                         int copy = min_t(unsigned int, len, vec->iov_len);
 906                         memcpy(kdata, vec->iov_base, copy);
 907                         len -= copy;
 908                         kdata += copy;
 909                         vec->iov_base += copy;
 910                         vec->iov_len -= copy;
 911                 }
 912                 vec++;
 913         }
 914
 915         return 0;
 916 }
 917
 918 extern bool disable_ertm;
 919
 920 int l2cap_init_sockets(void);
 921 void l2cap_cleanup_sockets(void);
 922 bool l2cap_is_socket(struct socket *sock);
 923
 924 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
 925 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
 926
 927 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
 928 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);
 929
 930 struct l2cap_chan *l2cap_chan_create(void);
 931 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
 932 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 933                        bdaddr_t *dst, u8 dst_type);
 934 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
 935 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
 936 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
 937 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
 938 int l2cap_ertm_init(struct l2cap_chan *chan);
 939 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
 940 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
 941 void l2cap_chan_del(struct l2cap_chan *chan, int err);
 942 void l2cap_send_conn_req(struct l2cap_chan *chan);
 943 void l2cap_move_start(struct l2cap_chan *chan);
 944 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
 945                        u8 status);
 946 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
 947
 948 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
 949 void l2cap_conn_put(struct l2cap_conn *conn);
 950
 951 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
 952 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
 953
 954 #endif /* __L2CAP_H */