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_LE_DEFAULT_MTU 23 41 42 #define L2CAP_DISC_TIMEOUT (100) 43 #define L2CAP_DISC_REJ_TIMEOUT (5000) /* 5 seconds */ 44 #define L2CAP_ENC_TIMEOUT (5000) /* 5 seconds */ 45 #define L2CAP_CONN_TIMEOUT (40000) /* 40 seconds */ 46 #define L2CAP_INFO_TIMEOUT (4000) /* 4 seconds */ 47 48 /* L2CAP socket address */ 49 struct sockaddr_l2 { 50 sa_family_t l2_family; 51 __le16 l2_psm; 52 bdaddr_t l2_bdaddr; 53 __le16 l2_cid; 54 }; 55 56 /* L2CAP socket options */ 57 #define L2CAP_OPTIONS 0x01 58 struct l2cap_options { 59 __u16 omtu; 60 __u16 imtu; 61 __u16 flush_to; 62 __u8 mode; 63 __u8 fcs; 64 __u8 max_tx; 65 __u16 txwin_size; 66 }; 67 68 #define L2CAP_CONNINFO 0x02 69 struct l2cap_conninfo { 70 __u16 hci_handle; 71 __u8 dev_class[3]; 72 }; 73 74 #define L2CAP_LM 0x03 75 #define L2CAP_LM_MASTER 0x0001 76 #define L2CAP_LM_AUTH 0x0002 77 #define L2CAP_LM_ENCRYPT 0x0004 78 #define L2CAP_LM_TRUSTED 0x0008 79 #define L2CAP_LM_RELIABLE 0x0010 80 #define L2CAP_LM_SECURE 0x0020 81 82 /* L2CAP command codes */ 83 #define L2CAP_COMMAND_REJ 0x01 84 #define L2CAP_CONN_REQ 0x02 85 #define L2CAP_CONN_RSP 0x03 86 #define L2CAP_CONF_REQ 0x04 87 #define L2CAP_CONF_RSP 0x05 88 #define L2CAP_DISCONN_REQ 0x06 89 #define L2CAP_DISCONN_RSP 0x07 90 #define L2CAP_ECHO_REQ 0x08 91 #define L2CAP_ECHO_RSP 0x09 92 #define L2CAP_INFO_REQ 0x0a 93 #define L2CAP_INFO_RSP 0x0b 94 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12 95 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13 96 97 /* L2CAP feature mask */ 98 #define L2CAP_FEAT_FLOWCTL 0x00000001 99 #define L2CAP_FEAT_RETRANS 0x00000002 100 #define L2CAP_FEAT_ERTM 0x00000008 101 #define L2CAP_FEAT_STREAMING 0x00000010 102 #define L2CAP_FEAT_FCS 0x00000020 103 #define L2CAP_FEAT_FIXED_CHAN 0x00000080 104 105 /* L2CAP checksum option */ 106 #define L2CAP_FCS_NONE 0x00 107 #define L2CAP_FCS_CRC16 0x01 108 109 /* L2CAP Control Field bit masks */ 110 #define L2CAP_CTRL_SAR 0xC000 111 #define L2CAP_CTRL_REQSEQ 0x3F00 112 #define L2CAP_CTRL_TXSEQ 0x007E 113 #define L2CAP_CTRL_RETRANS 0x0080 114 #define L2CAP_CTRL_FINAL 0x0080 115 #define L2CAP_CTRL_POLL 0x0010 116 #define L2CAP_CTRL_SUPERVISE 0x000C 117 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */ 118 119 #define L2CAP_CTRL_TXSEQ_SHIFT 1 120 #define L2CAP_CTRL_REQSEQ_SHIFT 8 121 #define L2CAP_CTRL_SAR_SHIFT 14 122 123 /* L2CAP Supervisory Function */ 124 #define L2CAP_SUPER_RCV_READY 0x0000 125 #define L2CAP_SUPER_REJECT 0x0004 126 #define L2CAP_SUPER_RCV_NOT_READY 0x0008 127 #define L2CAP_SUPER_SELECT_REJECT 0x000C 128 129 /* L2CAP Segmentation and Reassembly */ 130 #define L2CAP_SDU_UNSEGMENTED 0x0000 131 #define L2CAP_SDU_START 0x4000 132 #define L2CAP_SDU_END 0x8000 133 #define L2CAP_SDU_CONTINUE 0xC000 134 135 /* L2CAP Command rej. reasons */ 136 #define L2CAP_REJ_NOT_UNDERSTOOD 0x0000 137 #define L2CAP_REJ_MTU_EXCEEDED 0x0001 138 #define L2CAP_REJ_INVALID_CID 0x0002 139 140 141 /* L2CAP structures */ 142 struct l2cap_hdr { 143 __le16 len; 144 __le16 cid; 145 } __packed; 146 #define L2CAP_HDR_SIZE 4 147 148 struct l2cap_cmd_hdr { 149 __u8 code; 150 __u8 ident; 151 __le16 len; 152 } __packed; 153 #define L2CAP_CMD_HDR_SIZE 4 154 155 struct l2cap_cmd_rej_unk { 156 __le16 reason; 157 } __packed; 158 159 struct l2cap_cmd_rej_mtu { 160 __le16 reason; 161 __le16 max_mtu; 162 } __packed; 163 164 struct l2cap_cmd_rej_cid { 165 __le16 reason; 166 __le16 scid; 167 __le16 dcid; 168 } __packed; 169 170 struct l2cap_conn_req { 171 __le16 psm; 172 __le16 scid; 173 } __packed; 174 175 struct l2cap_conn_rsp { 176 __le16 dcid; 177 __le16 scid; 178 __le16 result; 179 __le16 status; 180 } __packed; 181 182 /* channel indentifier */ 183 #define L2CAP_CID_SIGNALING 0x0001 184 #define L2CAP_CID_CONN_LESS 0x0002 185 #define L2CAP_CID_LE_DATA 0x0004 186 #define L2CAP_CID_LE_SIGNALING 0x0005 187 #define L2CAP_CID_SMP 0x0006 188 #define L2CAP_CID_DYN_START 0x0040 189 #define L2CAP_CID_DYN_END 0xffff 190 191 /* connect result */ 192 #define L2CAP_CR_SUCCESS 0x0000 193 #define L2CAP_CR_PEND 0x0001 194 #define L2CAP_CR_BAD_PSM 0x0002 195 #define L2CAP_CR_SEC_BLOCK 0x0003 196 #define L2CAP_CR_NO_MEM 0x0004 197 198 /* connect status */ 199 #define L2CAP_CS_NO_INFO 0x0000 200 #define L2CAP_CS_AUTHEN_PEND 0x0001 201 #define L2CAP_CS_AUTHOR_PEND 0x0002 202 203 struct l2cap_conf_req { 204 __le16 dcid; 205 __le16 flags; 206 __u8 data[0]; 207 } __packed; 208 209 struct l2cap_conf_rsp { 210 __le16 scid; 211 __le16 flags; 212 __le16 result; 213 __u8 data[0]; 214 } __packed; 215 216 #define L2CAP_CONF_SUCCESS 0x0000 217 #define L2CAP_CONF_UNACCEPT 0x0001 218 #define L2CAP_CONF_REJECT 0x0002 219 #define L2CAP_CONF_UNKNOWN 0x0003 220 221 struct l2cap_conf_opt { 222 __u8 type; 223 __u8 len; 224 __u8 val[0]; 225 } __packed; 226 #define L2CAP_CONF_OPT_SIZE 2 227 228 #define L2CAP_CONF_HINT 0x80 229 #define L2CAP_CONF_MASK 0x7f 230 231 #define L2CAP_CONF_MTU 0x01 232 #define L2CAP_CONF_FLUSH_TO 0x02 233 #define L2CAP_CONF_QOS 0x03 234 #define L2CAP_CONF_RFC 0x04 235 #define L2CAP_CONF_FCS 0x05 236 237 #define L2CAP_CONF_MAX_SIZE 22 238 239 struct l2cap_conf_rfc { 240 __u8 mode; 241 __u8 txwin_size; 242 __u8 max_transmit; 243 __le16 retrans_timeout; 244 __le16 monitor_timeout; 245 __le16 max_pdu_size; 246 } __packed; 247 248 #define L2CAP_MODE_BASIC 0x00 249 #define L2CAP_MODE_RETRANS 0x01 250 #define L2CAP_MODE_FLOWCTL 0x02 251 #define L2CAP_MODE_ERTM 0x03 252 #define L2CAP_MODE_STREAMING 0x04 253 254 struct l2cap_disconn_req { 255 __le16 dcid; 256 __le16 scid; 257 } __packed; 258 259 struct l2cap_disconn_rsp { 260 __le16 dcid; 261 __le16 scid; 262 } __packed; 263 264 struct l2cap_info_req { 265 __le16 type; 266 } __packed; 267 268 struct l2cap_info_rsp { 269 __le16 type; 270 __le16 result; 271 __u8 data[0]; 272 } __packed; 273 274 /* info type */ 275 #define L2CAP_IT_CL_MTU 0x0001 276 #define L2CAP_IT_FEAT_MASK 0x0002 277 #define L2CAP_IT_FIXED_CHAN 0x0003 278 279 /* info result */ 280 #define L2CAP_IR_SUCCESS 0x0000 281 #define L2CAP_IR_NOTSUPP 0x0001 282 283 struct l2cap_conn_param_update_req { 284 __le16 min; 285 __le16 max; 286 __le16 latency; 287 __le16 to_multiplier; 288 } __packed; 289 290 struct l2cap_conn_param_update_rsp { 291 __le16 result; 292 } __packed; 293 294 /* Connection Parameters result */ 295 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000 296 #define L2CAP_CONN_PARAM_REJECTED 0x0001 297 298 /* ----- L2CAP channels and connections ----- */ 299 struct srej_list { 300 __u8 tx_seq; 301 struct list_head list; 302 }; 303 304 struct l2cap_chan { 305 struct sock *sk; 306 307 struct l2cap_conn *conn; 308 309 __u8 state; 310 311 atomic_t refcnt; 312 313 __le16 psm; 314 __u16 dcid; 315 __u16 scid; 316 317 __u16 imtu; 318 __u16 omtu; 319 __u16 flush_to; 320 __u8 mode; 321 __u8 chan_type; 322 323 __le16 sport; 324 325 __u8 sec_level; 326 __u8 role_switch; 327 __u8 force_reliable; 328 __u8 flushable; 329 __u8 force_active; 330 331 __u8 ident; 332 333 __u8 conf_req[64]; 334 __u8 conf_len; 335 __u8 num_conf_req; 336 __u8 num_conf_rsp; 337 338 __u8 fcs; 339 340 __u8 tx_win; 341 __u8 max_tx; 342 __u16 retrans_timeout; 343 __u16 monitor_timeout; 344 __u16 mps; 345 346 unsigned long conf_state; 347 unsigned long conn_state; 348 349 __u8 next_tx_seq; 350 __u8 expected_ack_seq; 351 __u8 expected_tx_seq; 352 __u8 buffer_seq; 353 __u8 buffer_seq_srej; 354 __u8 srej_save_reqseq; 355 __u8 frames_sent; 356 __u8 unacked_frames; 357 __u8 retry_count; 358 __u8 num_acked; 359 __u16 sdu_len; 360 struct sk_buff *sdu; 361 struct sk_buff *sdu_last_frag; 362 363 __u8 remote_tx_win; 364 __u8 remote_max_tx; 365 __u16 remote_mps; 366 367 struct timer_list chan_timer; 368 struct timer_list retrans_timer; 369 struct timer_list monitor_timer; 370 struct timer_list ack_timer; 371 struct sk_buff *tx_send_head; 372 struct sk_buff_head tx_q; 373 struct sk_buff_head srej_q; 374 struct list_head srej_l; 375 376 struct list_head list; 377 struct list_head global_l; 378 379 void *data; 380 struct l2cap_ops *ops; 381 }; 382 383 struct l2cap_ops { 384 char *name; 385 386 struct l2cap_chan *(*new_connection) (void *data); 387 int (*recv) (void *data, struct sk_buff *skb); 388 void (*close) (void *data); 389 void (*state_change) (void *data, int state); 390 }; 391 392 struct l2cap_conn { 393 struct hci_conn *hcon; 394 395 bdaddr_t *dst; 396 bdaddr_t *src; 397 398 unsigned int mtu; 399 400 __u32 feat_mask; 401 402 __u8 info_state; 403 __u8 info_ident; 404 405 struct timer_list info_timer; 406 407 spinlock_t lock; 408 409 struct sk_buff *rx_skb; 410 __u32 rx_len; 411 __u8 tx_ident; 412 413 __u8 disc_reason; 414 415 struct timer_list security_timer; 416 struct smp_chan *smp_chan; 417 418 struct list_head chan_l; 419 rwlock_t chan_lock; 420 }; 421 422 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01 423 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04 424 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08 425 426 #define L2CAP_CHAN_RAW 1 427 #define L2CAP_CHAN_CONN_LESS 2 428 #define L2CAP_CHAN_CONN_ORIENTED 3 429 430 /* ----- L2CAP socket info ----- */ 431 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk) 432 433 struct l2cap_pinfo { 434 struct bt_sock bt; 435 struct l2cap_chan *chan; 436 struct sk_buff *rx_busy_skb; 437 }; 438 439 enum { 440 CONF_REQ_SENT, 441 CONF_INPUT_DONE, 442 CONF_OUTPUT_DONE, 443 CONF_MTU_DONE, 444 CONF_MODE_DONE, 445 CONF_CONNECT_PEND, 446 CONF_NO_FCS_RECV, 447 CONF_STATE2_DEVICE, 448 }; 449 450 #define L2CAP_CONF_MAX_CONF_REQ 2 451 #define L2CAP_CONF_MAX_CONF_RSP 2 452 453 enum { 454 CONN_SREJ_SENT, 455 CONN_WAIT_F, 456 CONN_SREJ_ACT, 457 CONN_SEND_PBIT, 458 CONN_REMOTE_BUSY, 459 CONN_LOCAL_BUSY, 460 CONN_REJ_ACT, 461 CONN_SEND_FBIT, 462 CONN_RNR_SENT, 463 }; 464 465 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t)) 466 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer) 467 #define __set_retrans_timer(c) l2cap_set_timer(c, &c->retrans_timer, \ 468 L2CAP_DEFAULT_RETRANS_TO); 469 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer) 470 #define __set_monitor_timer(c) l2cap_set_timer(c, &c->monitor_timer, \ 471 L2CAP_DEFAULT_MONITOR_TO); 472 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer) 473 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \ 474 L2CAP_DEFAULT_ACK_TO); 475 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer) 476 477 static inline int l2cap_tx_window_full(struct l2cap_chan *ch) 478 { 479 int sub; 480 481 sub = (ch->next_tx_seq - ch->expected_ack_seq) % 64; 482 483 if (sub < 0) 484 sub += 64; 485 486 return sub == ch->remote_tx_win; 487 } 488 489 #define __get_txseq(ctrl) (((ctrl) & L2CAP_CTRL_TXSEQ) >> 1) 490 #define __get_reqseq(ctrl) (((ctrl) & L2CAP_CTRL_REQSEQ) >> 8) 491 #define __is_iframe(ctrl) (!((ctrl) & L2CAP_CTRL_FRAME_TYPE)) 492 #define __is_sframe(ctrl) ((ctrl) & L2CAP_CTRL_FRAME_TYPE) 493 #define __is_sar_start(ctrl) (((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START) 494 495 extern int disable_ertm; 496 497 int l2cap_init_sockets(void); 498 void l2cap_cleanup_sockets(void); 499 500 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan); 501 int __l2cap_wait_ack(struct sock *sk); 502 503 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm); 504 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid); 505 506 struct l2cap_chan *l2cap_chan_create(struct sock *sk); 507 void l2cap_chan_close(struct l2cap_chan *chan, int reason); 508 void l2cap_chan_destroy(struct l2cap_chan *chan); 509 int l2cap_chan_connect(struct l2cap_chan *chan); 510 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len); 511 void l2cap_chan_busy(struct l2cap_chan *chan, int busy); 512 513 #endif /* __L2CAP_H */ 514