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 /* L2CAP defaults */
  31 #define L2CAP_DEFAULT_MTU               672
  32 #define L2CAP_DEFAULT_MIN_MTU           48
  33 #define L2CAP_DEFAULT_FLUSH_TO          0xffff
  34 #define L2CAP_DEFAULT_TX_WINDOW         63
  35 #define L2CAP_DEFAULT_MAX_TX            3
  36 #define L2CAP_DEFAULT_RETRANS_TO        2000    /* 2 seconds */
  37 #define L2CAP_DEFAULT_MONITOR_TO        12000   /* 12 seconds */
  38 #define L2CAP_DEFAULT_MAX_PDU_SIZE      1009    /* Sized for 3-DH5 packet */
  39 #define L2CAP_DEFAULT_ACK_TO            200
  40 #define L2CAP_LOCAL_BUSY_TRIES          12
  41 #define L2CAP_LE_DEFAULT_MTU            23
  42
  43 #define L2CAP_CONN_TIMEOUT      (40000) /* 40 seconds */
  44 #define L2CAP_INFO_TIMEOUT      (4000)  /*  4 seconds */
  45
  46 /* L2CAP socket address */
  47 struct sockaddr_l2 {
  48         sa_family_t     l2_family;
  49         __le16          l2_psm;
  50         bdaddr_t        l2_bdaddr;
  51         __le16          l2_cid;
  52 };
  53
  54 /* L2CAP socket options */
  55 #define L2CAP_OPTIONS   0x01
  56 struct l2cap_options {
  57         __u16 omtu;
  58         __u16 imtu;
  59         __u16 flush_to;
  60         __u8  mode;
  61         __u8  fcs;
  62         __u8  max_tx;
  63         __u16 txwin_size;
  64 };
  65
  66 #define L2CAP_CONNINFO  0x02
  67 struct l2cap_conninfo {
  68         __u16 hci_handle;
  69         __u8  dev_class[3];
  70 };
  71
  72 #define L2CAP_LM        0x03
  73 #define L2CAP_LM_MASTER         0x0001
  74 #define L2CAP_LM_AUTH           0x0002
  75 #define L2CAP_LM_ENCRYPT        0x0004
  76 #define L2CAP_LM_TRUSTED        0x0008
  77 #define L2CAP_LM_RELIABLE       0x0010
  78 #define L2CAP_LM_SECURE         0x0020
  79
  80 /* L2CAP command codes */
  81 #define L2CAP_COMMAND_REJ       0x01
  82 #define L2CAP_CONN_REQ          0x02
  83 #define L2CAP_CONN_RSP          0x03
  84 #define L2CAP_CONF_REQ          0x04
  85 #define L2CAP_CONF_RSP          0x05
  86 #define L2CAP_DISCONN_REQ       0x06
  87 #define L2CAP_DISCONN_RSP       0x07
  88 #define L2CAP_ECHO_REQ          0x08
  89 #define L2CAP_ECHO_RSP          0x09
  90 #define L2CAP_INFO_REQ          0x0a
  91 #define L2CAP_INFO_RSP          0x0b
  92 #define L2CAP_CONN_PARAM_UPDATE_REQ     0x12
  93 #define L2CAP_CONN_PARAM_UPDATE_RSP     0x13
  94
  95 /* L2CAP feature mask */
  96 #define L2CAP_FEAT_FLOWCTL      0x00000001
  97 #define L2CAP_FEAT_RETRANS      0x00000002
  98 #define L2CAP_FEAT_ERTM         0x00000008
  99 #define L2CAP_FEAT_STREAMING    0x00000010
 100 #define L2CAP_FEAT_FCS          0x00000020
 101 #define L2CAP_FEAT_FIXED_CHAN   0x00000080
 102
 103 /* L2CAP checksum option */
 104 #define L2CAP_FCS_NONE          0x00
 105 #define L2CAP_FCS_CRC16         0x01
 106
 107 /* L2CAP Control Field bit masks */
 108 #define L2CAP_CTRL_SAR               0xC000
 109 #define L2CAP_CTRL_REQSEQ            0x3F00
 110 #define L2CAP_CTRL_TXSEQ             0x007E
 111 #define L2CAP_CTRL_RETRANS           0x0080
 112 #define L2CAP_CTRL_FINAL             0x0080
 113 #define L2CAP_CTRL_POLL              0x0010
 114 #define L2CAP_CTRL_SUPERVISE         0x000C
 115 #define L2CAP_CTRL_FRAME_TYPE        0x0001 /* I- or S-Frame */
 116
 117 #define L2CAP_CTRL_TXSEQ_SHIFT      1
 118 #define L2CAP_CTRL_REQSEQ_SHIFT     8
 119 #define L2CAP_CTRL_SAR_SHIFT       14
 120
 121 /* L2CAP Supervisory Function */
 122 #define L2CAP_SUPER_RCV_READY           0x0000
 123 #define L2CAP_SUPER_REJECT              0x0004
 124 #define L2CAP_SUPER_RCV_NOT_READY       0x0008
 125 #define L2CAP_SUPER_SELECT_REJECT       0x000C
 126
 127 /* L2CAP Segmentation and Reassembly */
 128 #define L2CAP_SDU_UNSEGMENTED       0x0000
 129 #define L2CAP_SDU_START             0x4000
 130 #define L2CAP_SDU_END               0x8000
 131 #define L2CAP_SDU_CONTINUE          0xC000
 132
 133 /* L2CAP structures */
 134 struct l2cap_hdr {
 135         __le16     len;
 136         __le16     cid;
 137 } __packed;
 138 #define L2CAP_HDR_SIZE          4
 139
 140 struct l2cap_cmd_hdr {
 141         __u8       code;
 142         __u8       ident;
 143         __le16     len;
 144 } __packed;
 145 #define L2CAP_CMD_HDR_SIZE      4
 146
 147 struct l2cap_cmd_rej {
 148         __le16     reason;
 149 } __packed;
 150
 151 struct l2cap_conn_req {
 152         __le16     psm;
 153         __le16     scid;
 154 } __packed;
 155
 156 struct l2cap_conn_rsp {
 157         __le16     dcid;
 158         __le16     scid;
 159         __le16     result;
 160         __le16     status;
 161 } __packed;
 162
 163 /* channel indentifier */
 164 #define L2CAP_CID_SIGNALING     0x0001
 165 #define L2CAP_CID_CONN_LESS     0x0002
 166 #define L2CAP_CID_LE_DATA       0x0004
 167 #define L2CAP_CID_LE_SIGNALING  0x0005
 168 #define L2CAP_CID_SMP           0x0006
 169 #define L2CAP_CID_DYN_START     0x0040
 170 #define L2CAP_CID_DYN_END       0xffff
 171
 172 /* connect result */
 173 #define L2CAP_CR_SUCCESS        0x0000
 174 #define L2CAP_CR_PEND           0x0001
 175 #define L2CAP_CR_BAD_PSM        0x0002
 176 #define L2CAP_CR_SEC_BLOCK      0x0003
 177 #define L2CAP_CR_NO_MEM         0x0004
 178
 179 /* connect status */
 180 #define L2CAP_CS_NO_INFO        0x0000
 181 #define L2CAP_CS_AUTHEN_PEND    0x0001
 182 #define L2CAP_CS_AUTHOR_PEND    0x0002
 183
 184 struct l2cap_conf_req {
 185         __le16     dcid;
 186         __le16     flags;
 187         __u8       data[0];
 188 } __packed;
 189
 190 struct l2cap_conf_rsp {
 191         __le16     scid;
 192         __le16     flags;
 193         __le16     result;
 194         __u8       data[0];
 195 } __packed;
 196
 197 #define L2CAP_CONF_SUCCESS      0x0000
 198 #define L2CAP_CONF_UNACCEPT     0x0001
 199 #define L2CAP_CONF_REJECT       0x0002
 200 #define L2CAP_CONF_UNKNOWN      0x0003
 201
 202 struct l2cap_conf_opt {
 203         __u8       type;
 204         __u8       len;
 205         __u8       val[0];
 206 } __packed;
 207 #define L2CAP_CONF_OPT_SIZE     2
 208
 209 #define L2CAP_CONF_HINT         0x80
 210 #define L2CAP_CONF_MASK         0x7f
 211
 212 #define L2CAP_CONF_MTU          0x01
 213 #define L2CAP_CONF_FLUSH_TO     0x02
 214 #define L2CAP_CONF_QOS          0x03
 215 #define L2CAP_CONF_RFC          0x04
 216 #define L2CAP_CONF_FCS          0x05
 217
 218 #define L2CAP_CONF_MAX_SIZE     22
 219
 220 struct l2cap_conf_rfc {
 221         __u8       mode;
 222         __u8       txwin_size;
 223         __u8       max_transmit;
 224         __le16     retrans_timeout;
 225         __le16     monitor_timeout;
 226         __le16     max_pdu_size;
 227 } __packed;
 228
 229 #define L2CAP_MODE_BASIC        0x00
 230 #define L2CAP_MODE_RETRANS      0x01
 231 #define L2CAP_MODE_FLOWCTL      0x02
 232 #define L2CAP_MODE_ERTM         0x03
 233 #define L2CAP_MODE_STREAMING    0x04
 234
 235 struct l2cap_disconn_req {
 236         __le16     dcid;
 237         __le16     scid;
 238 } __packed;
 239
 240 struct l2cap_disconn_rsp {
 241         __le16     dcid;
 242         __le16     scid;
 243 } __packed;
 244
 245 struct l2cap_info_req {
 246         __le16      type;
 247 } __packed;
 248
 249 struct l2cap_info_rsp {
 250         __le16      type;
 251         __le16      result;
 252         __u8        data[0];
 253 } __packed;
 254
 255 /* info type */
 256 #define L2CAP_IT_CL_MTU     0x0001
 257 #define L2CAP_IT_FEAT_MASK  0x0002
 258 #define L2CAP_IT_FIXED_CHAN 0x0003
 259
 260 /* info result */
 261 #define L2CAP_IR_SUCCESS    0x0000
 262 #define L2CAP_IR_NOTSUPP    0x0001
 263
 264 struct l2cap_conn_param_update_req {
 265         __le16      min;
 266         __le16      max;
 267         __le16      latency;
 268         __le16      to_multiplier;
 269 } __packed;
 270
 271 struct l2cap_conn_param_update_rsp {
 272         __le16      result;
 273 } __packed;
 274
 275 /* Connection Parameters result */
 276 #define L2CAP_CONN_PARAM_ACCEPTED       0x0000
 277 #define L2CAP_CONN_PARAM_REJECTED       0x0001
 278
 279 /* ----- L2CAP connections ----- */
 280 struct l2cap_chan_list {
 281         struct sock     *head;
 282         rwlock_t        lock;
 283         long            num;
 284 };
 285
 286 struct l2cap_conn {
 287         struct hci_conn *hcon;
 288
 289         bdaddr_t        *dst;
 290         bdaddr_t        *src;
 291
 292         unsigned int    mtu;
 293
 294         __u32           feat_mask;
 295
 296         __u8            info_state;
 297         __u8            info_ident;
 298
 299         struct timer_list info_timer;
 300
 301         spinlock_t      lock;
 302
 303         struct sk_buff *rx_skb;
 304         __u32           rx_len;
 305         __u8            rx_ident;
 306         __u8            tx_ident;
 307
 308         __u8            disc_reason;
 309
 310         struct l2cap_chan_list chan_list;
 311 };
 312
 313 struct sock_del_list {
 314         struct sock *sk;
 315         struct list_head list;
 316 };
 317
 318 #define L2CAP_INFO_CL_MTU_REQ_SENT      0x01
 319 #define L2CAP_INFO_FEAT_MASK_REQ_SENT   0x04
 320 #define L2CAP_INFO_FEAT_MASK_REQ_DONE   0x08
 321
 322 /* ----- L2CAP channel and socket info ----- */
 323 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 324 #define TX_QUEUE(sk) (&l2cap_pi(sk)->tx_queue)
 325 #define SREJ_QUEUE(sk) (&l2cap_pi(sk)->srej_queue)
 326 #define BUSY_QUEUE(sk) (&l2cap_pi(sk)->busy_queue)
 327 #define SREJ_LIST(sk) (&l2cap_pi(sk)->srej_l.list)
 328
 329 struct srej_list {
 330         __u8    tx_seq;
 331         struct list_head list;
 332 };
 333
 334 struct l2cap_pinfo {
 335         struct bt_sock  bt;
 336         __le16          psm;
 337         __u16           dcid;
 338         __u16           scid;
 339
 340         __u16           imtu;
 341         __u16           omtu;
 342         __u16           flush_to;
 343         __u8            mode;
 344         __u8            num_conf_req;
 345         __u8            num_conf_rsp;
 346
 347         __u8            fcs;
 348         __u8            sec_level;
 349         __u8            role_switch;
 350         __u8            force_reliable;
 351         __u8            flushable;
 352
 353         __u8            conf_req[64];
 354         __u8            conf_len;
 355         __u8            conf_state;
 356         __u16           conn_state;
 357
 358         __u8            next_tx_seq;
 359         __u8            expected_ack_seq;
 360         __u8            expected_tx_seq;
 361         __u8            buffer_seq;
 362         __u8            buffer_seq_srej;
 363         __u8            srej_save_reqseq;
 364         __u8            frames_sent;
 365         __u8            unacked_frames;
 366         __u8            retry_count;
 367         __u8            num_acked;
 368         __u16           sdu_len;
 369         __u16           partial_sdu_len;
 370         struct sk_buff  *sdu;
 371
 372         __u8            ident;
 373
 374         __u8            tx_win;
 375         __u8            max_tx;
 376         __u8            remote_tx_win;
 377         __u8            remote_max_tx;
 378         __u16           retrans_timeout;
 379         __u16           monitor_timeout;
 380         __u16           remote_mps;
 381         __u16           mps;
 382
 383         __le16          sport;
 384
 385         struct timer_list       retrans_timer;
 386         struct timer_list       monitor_timer;
 387         struct timer_list       ack_timer;
 388         struct sk_buff_head     tx_queue;
 389         struct sk_buff_head     srej_queue;
 390         struct sk_buff_head     busy_queue;
 391         struct work_struct      busy_work;
 392         struct srej_list        srej_l;
 393         struct l2cap_conn       *conn;
 394         struct sock             *next_c;
 395         struct sock             *prev_c;
 396 };
 397
 398 #define L2CAP_CONF_REQ_SENT       0x01
 399 #define L2CAP_CONF_INPUT_DONE     0x02
 400 #define L2CAP_CONF_OUTPUT_DONE    0x04
 401 #define L2CAP_CONF_MTU_DONE       0x08
 402 #define L2CAP_CONF_MODE_DONE      0x10
 403 #define L2CAP_CONF_CONNECT_PEND   0x20
 404 #define L2CAP_CONF_NO_FCS_RECV    0x40
 405 #define L2CAP_CONF_STATE2_DEVICE  0x80
 406
 407 #define L2CAP_CONF_MAX_CONF_REQ 2
 408 #define L2CAP_CONF_MAX_CONF_RSP 2
 409
 410 #define L2CAP_CONN_SAR_SDU         0x0001
 411 #define L2CAP_CONN_SREJ_SENT       0x0002
 412 #define L2CAP_CONN_WAIT_F          0x0004
 413 #define L2CAP_CONN_SREJ_ACT        0x0008
 414 #define L2CAP_CONN_SEND_PBIT       0x0010
 415 #define L2CAP_CONN_REMOTE_BUSY     0x0020
 416 #define L2CAP_CONN_LOCAL_BUSY      0x0040
 417 #define L2CAP_CONN_REJ_ACT         0x0080
 418 #define L2CAP_CONN_SEND_FBIT       0x0100
 419 #define L2CAP_CONN_RNR_SENT        0x0200
 420 #define L2CAP_CONN_SAR_RETRY       0x0400
 421
 422 #define __mod_retrans_timer() mod_timer(&l2cap_pi(sk)->retrans_timer, \
 423                 jiffies +  msecs_to_jiffies(L2CAP_DEFAULT_RETRANS_TO));
 424 #define __mod_monitor_timer() mod_timer(&l2cap_pi(sk)->monitor_timer, \
 425                 jiffies + msecs_to_jiffies(L2CAP_DEFAULT_MONITOR_TO));
 426 #define __mod_ack_timer() mod_timer(&l2cap_pi(sk)->ack_timer, \
 427                 jiffies + msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
 428
 429 static inline int l2cap_tx_window_full(struct sock *sk)
 430 {
 431         struct l2cap_pinfo *pi = l2cap_pi(sk);
 432         int sub;
 433
 434         sub = (pi->next_tx_seq - pi->expected_ack_seq) % 64;
 435
 436         if (sub < 0)
 437                 sub += 64;
 438
 439         return sub == pi->remote_tx_win;
 440 }
 441
 442 #define __get_txseq(ctrl)       (((ctrl) & L2CAP_CTRL_TXSEQ) >> 1)
 443 #define __get_reqseq(ctrl)      (((ctrl) & L2CAP_CTRL_REQSEQ) >> 8)
 444 #define __is_iframe(ctrl)       (!((ctrl) & L2CAP_CTRL_FRAME_TYPE))
 445 #define __is_sframe(ctrl)       ((ctrl) & L2CAP_CTRL_FRAME_TYPE)
 446 #define __is_sar_start(ctrl)    (((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START)
 447
 448 extern int disable_ertm;
 449 extern const struct proto_ops l2cap_sock_ops;
 450 extern struct bt_sock_list l2cap_sk_list;
 451
 452 int l2cap_init_sockets(void);
 453 void l2cap_cleanup_sockets(void);
 454
 455 u8 l2cap_get_ident(struct l2cap_conn *conn);
 456 void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data);
 457 int l2cap_build_conf_req(struct sock *sk, void *data);
 458 int __l2cap_wait_ack(struct sock *sk);
 459
 460 struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len);
 461 struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len);
 462 struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen);
 463 int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len);
 464 void l2cap_do_send(struct sock *sk, struct sk_buff *skb);
 465 void l2cap_streaming_send(struct sock *sk);
 466 int l2cap_ertm_send(struct sock *sk);
 467
 468 void l2cap_sock_set_timer(struct sock *sk, long timeout);
 469 void l2cap_sock_clear_timer(struct sock *sk);
 470 void __l2cap_sock_close(struct sock *sk, int reason);
 471 void l2cap_sock_kill(struct sock *sk);
 472 void l2cap_sock_init(struct sock *sk, struct sock *parent);
 473 struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
 474                                                         int proto, gfp_t prio);
 475 void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err);
 476 void l2cap_chan_del(struct sock *sk, int err);
 477 int l2cap_do_connect(struct sock *sk);
 478
 479 #endif /* __L2CAP_H */