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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25#ifndef __L2CAP_H
26#define __L2CAP_H
27
28/* L2CAP defaults */
Marcel Holtmann47ec1dcd2009-05-02 18:57:55 -070029#define L2CAP_DEFAULT_MTU 672
Gustavo F. Padovanf2fcfcd2009-07-04 15:06:24 -030030#define L2CAP_DEFAULT_MIN_MTU 48
Marcel Holtmann47ec1dcd2009-05-02 18:57:55 -070031#define L2CAP_DEFAULT_FLUSH_TO 0xffff
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -030032#define L2CAP_DEFAULT_TX_WINDOW 63
33#define L2CAP_DEFAULT_NUM_TO_ACK (L2CAP_DEFAULT_TX_WINDOW/5)
Gustavo F. Padovane90bac02009-08-20 22:26:00 -030034#define L2CAP_DEFAULT_MAX_TX 3
35#define L2CAP_DEFAULT_RETRANS_TO 1000 /* 1 second */
36#define L2CAP_DEFAULT_MONITOR_TO 12000 /* 12 seconds */
Gustavo F. Padovanc74e5602009-08-20 22:25:58 -030037#define L2CAP_DEFAULT_MAX_PDU_SIZE 672
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Marcel Holtmann4e8402a2007-10-20 13:37:56 +020039#define L2CAP_CONN_TIMEOUT (40000) /* 40 seconds */
40#define L2CAP_INFO_TIMEOUT (4000) /* 4 seconds */
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42/* L2CAP socket address */
43struct sockaddr_l2 {
44 sa_family_t l2_family;
Al Viro8e036fc2007-07-29 00:16:36 -070045 __le16 l2_psm;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 bdaddr_t l2_bdaddr;
Marcel Holtmannf29972d2009-02-12 05:07:45 +010047 __le16 l2_cid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048};
49
50/* L2CAP socket options */
51#define L2CAP_OPTIONS 0x01
52struct l2cap_options {
53 __u16 omtu;
54 __u16 imtu;
55 __u16 flush_to;
56 __u8 mode;
Gustavo F. Padovanfcc203c2009-08-20 22:26:02 -030057 __u8 fcs;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058};
59
60#define L2CAP_CONNINFO 0x02
61struct l2cap_conninfo {
62 __u16 hci_handle;
63 __u8 dev_class[3];
64};
65
66#define L2CAP_LM 0x03
67#define L2CAP_LM_MASTER 0x0001
68#define L2CAP_LM_AUTH 0x0002
69#define L2CAP_LM_ENCRYPT 0x0004
70#define L2CAP_LM_TRUSTED 0x0008
71#define L2CAP_LM_RELIABLE 0x0010
72#define L2CAP_LM_SECURE 0x0020
73
74/* L2CAP command codes */
Marcel Holtmann47ec1dcd2009-05-02 18:57:55 -070075#define L2CAP_COMMAND_REJ 0x01
76#define L2CAP_CONN_REQ 0x02
77#define L2CAP_CONN_RSP 0x03
78#define L2CAP_CONF_REQ 0x04
79#define L2CAP_CONF_RSP 0x05
80#define L2CAP_DISCONN_REQ 0x06
81#define L2CAP_DISCONN_RSP 0x07
82#define L2CAP_ECHO_REQ 0x08
83#define L2CAP_ECHO_RSP 0x09
84#define L2CAP_INFO_REQ 0x0a
85#define L2CAP_INFO_RSP 0x0b
86
87/* L2CAP feature mask */
88#define L2CAP_FEAT_FLOWCTL 0x00000001
89#define L2CAP_FEAT_RETRANS 0x00000002
90#define L2CAP_FEAT_ERTM 0x00000008
91#define L2CAP_FEAT_STREAMING 0x00000010
92#define L2CAP_FEAT_FCS 0x00000020
93#define L2CAP_FEAT_FIXED_CHAN 0x00000080
94
95/* L2CAP checksum option */
96#define L2CAP_FCS_NONE 0x00
97#define L2CAP_FCS_CRC16 0x01
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -030099/* L2CAP Control Field bit masks */
100#define L2CAP_CTRL_SAR 0xC000
101#define L2CAP_CTRL_REQSEQ 0x3F00
102#define L2CAP_CTRL_TXSEQ 0x007E
103#define L2CAP_CTRL_RETRANS 0x0080
104#define L2CAP_CTRL_FINAL 0x0080
105#define L2CAP_CTRL_POLL 0x0010
106#define L2CAP_CTRL_SUPERVISE 0x000C
107#define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */
108
109#define L2CAP_CTRL_TXSEQ_SHIFT 1
110#define L2CAP_CTRL_REQSEQ_SHIFT 8
Gustavo F. Padovan8f171542009-08-20 22:26:03 -0300111#define L2CAP_CTRL_SAR_SHIFT 14
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -0300112
113/* L2CAP Supervisory Function */
114#define L2CAP_SUPER_RCV_READY 0x0000
115#define L2CAP_SUPER_REJECT 0x0004
116#define L2CAP_SUPER_RCV_NOT_READY 0x0008
117#define L2CAP_SUPER_SELECT_REJECT 0x000C
118
119/* L2CAP Segmentation and Reassembly */
120#define L2CAP_SDU_UNSEGMENTED 0x0000
121#define L2CAP_SDU_START 0x4000
122#define L2CAP_SDU_END 0x8000
123#define L2CAP_SDU_CONTINUE 0xC000
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125/* L2CAP structures */
126struct l2cap_hdr {
Al Viro8e036fc2007-07-29 00:16:36 -0700127 __le16 len;
128 __le16 cid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129} __attribute__ ((packed));
130#define L2CAP_HDR_SIZE 4
131
132struct l2cap_cmd_hdr {
133 __u8 code;
134 __u8 ident;
Al Viro8e036fc2007-07-29 00:16:36 -0700135 __le16 len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136} __attribute__ ((packed));
137#define L2CAP_CMD_HDR_SIZE 4
138
139struct l2cap_cmd_rej {
Al Viro8e036fc2007-07-29 00:16:36 -0700140 __le16 reason;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141} __attribute__ ((packed));
142
143struct l2cap_conn_req {
Al Viro8e036fc2007-07-29 00:16:36 -0700144 __le16 psm;
145 __le16 scid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146} __attribute__ ((packed));
147
148struct l2cap_conn_rsp {
Al Viro8e036fc2007-07-29 00:16:36 -0700149 __le16 dcid;
150 __le16 scid;
151 __le16 result;
152 __le16 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153} __attribute__ ((packed));
154
Gustavo F. Padovan8db4dc42009-04-20 01:31:05 -0300155/* channel indentifier */
156#define L2CAP_CID_SIGNALING 0x0001
157#define L2CAP_CID_CONN_LESS 0x0002
158#define L2CAP_CID_DYN_START 0x0040
159#define L2CAP_CID_DYN_END 0xffff
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161/* connect result */
Marcel Holtmann47ec1dcd2009-05-02 18:57:55 -0700162#define L2CAP_CR_SUCCESS 0x0000
163#define L2CAP_CR_PEND 0x0001
164#define L2CAP_CR_BAD_PSM 0x0002
165#define L2CAP_CR_SEC_BLOCK 0x0003
166#define L2CAP_CR_NO_MEM 0x0004
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168/* connect status */
Marcel Holtmann47ec1dcd2009-05-02 18:57:55 -0700169#define L2CAP_CS_NO_INFO 0x0000
170#define L2CAP_CS_AUTHEN_PEND 0x0001
171#define L2CAP_CS_AUTHOR_PEND 0x0002
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173struct l2cap_conf_req {
Al Viro8e036fc2007-07-29 00:16:36 -0700174 __le16 dcid;
175 __le16 flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 __u8 data[0];
177} __attribute__ ((packed));
178
179struct l2cap_conf_rsp {
Al Viro8e036fc2007-07-29 00:16:36 -0700180 __le16 scid;
181 __le16 flags;
182 __le16 result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 __u8 data[0];
184} __attribute__ ((packed));
185
Marcel Holtmann5dee9e72007-05-24 14:27:19 +0200186#define L2CAP_CONF_SUCCESS 0x0000
187#define L2CAP_CONF_UNACCEPT 0x0001
188#define L2CAP_CONF_REJECT 0x0002
189#define L2CAP_CONF_UNKNOWN 0x0003
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191struct l2cap_conf_opt {
192 __u8 type;
193 __u8 len;
194 __u8 val[0];
195} __attribute__ ((packed));
196#define L2CAP_CONF_OPT_SIZE 2
197
Gustavo F. Padovan589d2742009-04-20 01:31:07 -0300198#define L2CAP_CONF_HINT 0x80
Marcel Holtmann47ec1dcd2009-05-02 18:57:55 -0700199#define L2CAP_CONF_MASK 0x7f
Gustavo F. Padovan589d2742009-04-20 01:31:07 -0300200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201#define L2CAP_CONF_MTU 0x01
202#define L2CAP_CONF_FLUSH_TO 0x02
203#define L2CAP_CONF_QOS 0x03
204#define L2CAP_CONF_RFC 0x04
Marcel Holtmann47ec1dcd2009-05-02 18:57:55 -0700205#define L2CAP_CONF_FCS 0x05
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207#define L2CAP_CONF_MAX_SIZE 22
208
Marcel Holtmann6464f352007-10-20 13:39:51 +0200209struct l2cap_conf_rfc {
210 __u8 mode;
211 __u8 txwin_size;
212 __u8 max_transmit;
213 __le16 retrans_timeout;
214 __le16 monitor_timeout;
215 __le16 max_pdu_size;
216} __attribute__ ((packed));
217
218#define L2CAP_MODE_BASIC 0x00
219#define L2CAP_MODE_RETRANS 0x01
220#define L2CAP_MODE_FLOWCTL 0x02
Marcel Holtmann47ec1dcd2009-05-02 18:57:55 -0700221#define L2CAP_MODE_ERTM 0x03
Marcel Holtmannc6b03cf2009-05-02 22:31:10 -0700222#define L2CAP_MODE_STREAMING 0x04
Marcel Holtmann6464f352007-10-20 13:39:51 +0200223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224struct l2cap_disconn_req {
Al Viro8e036fc2007-07-29 00:16:36 -0700225 __le16 dcid;
226 __le16 scid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227} __attribute__ ((packed));
228
229struct l2cap_disconn_rsp {
Al Viro8e036fc2007-07-29 00:16:36 -0700230 __le16 dcid;
231 __le16 scid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232} __attribute__ ((packed));
233
234struct l2cap_info_req {
Al Viro8e036fc2007-07-29 00:16:36 -0700235 __le16 type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236} __attribute__ ((packed));
237
238struct l2cap_info_rsp {
Al Viro8e036fc2007-07-29 00:16:36 -0700239 __le16 type;
240 __le16 result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 __u8 data[0];
242} __attribute__ ((packed));
243
244/* info type */
245#define L2CAP_IT_CL_MTU 0x0001
246#define L2CAP_IT_FEAT_MASK 0x0002
Marcel Holtmanne1027a72009-02-09 09:18:02 +0100247#define L2CAP_IT_FIXED_CHAN 0x0003
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249/* info result */
250#define L2CAP_IR_SUCCESS 0x0000
251#define L2CAP_IR_NOTSUPP 0x0001
252
253/* ----- L2CAP connections ----- */
254struct l2cap_chan_list {
255 struct sock *head;
256 rwlock_t lock;
257 long num;
258};
259
260struct l2cap_conn {
261 struct hci_conn *hcon;
262
263 bdaddr_t *dst;
264 bdaddr_t *src;
265
266 unsigned int mtu;
267
Marcel Holtmann4e8402a2007-10-20 13:37:56 +0200268 __u32 feat_mask;
269
270 __u8 info_state;
271 __u8 info_ident;
272
273 struct timer_list info_timer;
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 spinlock_t lock;
276
277 struct sk_buff *rx_skb;
278 __u32 rx_len;
279 __u8 rx_ident;
280 __u8 tx_ident;
281
Marcel Holtmann2950f212009-02-12 14:02:50 +0100282 __u8 disc_reason;
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 struct l2cap_chan_list chan_list;
285};
286
Marcel Holtmann4e8402a2007-10-20 13:37:56 +0200287#define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
Marcel Holtmann984947d2009-02-06 23:35:19 +0100288#define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
289#define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
Marcel Holtmann4e8402a2007-10-20 13:37:56 +0200290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291/* ----- L2CAP channel and socket info ----- */
292#define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -0300293#define TX_QUEUE(sk) (&l2cap_pi(sk)->tx_queue)
Gustavo F. Padovan8f171542009-08-20 22:26:03 -0300294#define SREJ_QUEUE(sk) (&l2cap_pi(sk)->srej_queue)
295#define SREJ_LIST(sk) (&l2cap_pi(sk)->srej_l.list)
296
297struct srej_list {
298 __u8 tx_seq;
299 struct list_head list;
300};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302struct l2cap_pinfo {
303 struct bt_sock bt;
Al Viro8e036fc2007-07-29 00:16:36 -0700304 __le16 psm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 __u16 dcid;
306 __u16 scid;
307
308 __u16 imtu;
309 __u16 omtu;
310 __u16 flush_to;
Marcel Holtmannc6b03cf2009-05-02 22:31:10 -0700311 __u8 mode;
Gustavo F. Padovanf2fcfcd2009-07-04 15:06:24 -0300312 __u8 num_conf_req;
313 __u8 num_conf_rsp;
314
Marcel Holtmannc6b03cf2009-05-02 22:31:10 -0700315 __u8 fcs;
316 __u8 sec_level;
Marcel Holtmann2af6b9d2009-01-15 21:58:38 +0100317 __u8 role_switch;
Marcel Holtmannc6b03cf2009-05-02 22:31:10 -0700318 __u8 force_reliable;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Marcel Holtmann5dee9e72007-05-24 14:27:19 +0200320 __u8 conf_req[64];
321 __u8 conf_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 __u8 conf_state;
Gustavo F. Padovanc74e5602009-08-20 22:25:58 -0300323 __u8 conn_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -0300325 __u8 next_tx_seq;
326 __u8 expected_ack_seq;
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -0300327 __u8 expected_tx_seq;
Gustavo F. Padovan8f171542009-08-20 22:26:03 -0300328 __u8 buffer_seq;
329 __u8 buffer_seq_srej;
Gustavo F. Padovanef54fd92009-08-20 22:26:04 -0300330 __u8 srej_save_reqseq;
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -0300331 __u8 unacked_frames;
Gustavo F. Padovane90bac02009-08-20 22:26:00 -0300332 __u8 retry_count;
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -0300333 __u8 num_to_ack;
Gustavo F. Padovanc74e5602009-08-20 22:25:58 -0300334 __u16 sdu_len;
335 __u16 partial_sdu_len;
336 struct sk_buff *sdu;
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -0300337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 __u8 ident;
339
Gustavo F. Padovanf2fcfcd2009-07-04 15:06:24 -0300340 __u8 remote_tx_win;
341 __u8 remote_max_tx;
342 __u16 retrans_timeout;
343 __u16 monitor_timeout;
344 __u16 max_pdu_size;
345
Al Viro8e036fc2007-07-29 00:16:36 -0700346 __le16 sport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Gustavo F. Padovane90bac02009-08-20 22:26:00 -0300348 struct timer_list retrans_timer;
349 struct timer_list monitor_timer;
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -0300350 struct sk_buff_head tx_queue;
Gustavo F. Padovan8f171542009-08-20 22:26:03 -0300351 struct sk_buff_head srej_queue;
352 struct srej_list srej_l;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 struct l2cap_conn *conn;
354 struct sock *next_c;
355 struct sock *prev_c;
356};
357
Gustavo F. Padovanf2fcfcd2009-07-04 15:06:24 -0300358#define L2CAP_CONF_REQ_SENT 0x01
359#define L2CAP_CONF_INPUT_DONE 0x02
360#define L2CAP_CONF_OUTPUT_DONE 0x04
361#define L2CAP_CONF_MTU_DONE 0x08
362#define L2CAP_CONF_MODE_DONE 0x10
363#define L2CAP_CONF_CONNECT_PEND 0x20
Gustavo F. Padovanfcc203c2009-08-20 22:26:02 -0300364#define L2CAP_CONF_NO_FCS_RECV 0x40
Gustavo F. Padovanf2fcfcd2009-07-04 15:06:24 -0300365#define L2CAP_CONF_STATE2_DEVICE 0x80
Marcel Holtmann861d6882007-10-20 13:37:06 +0200366
Gustavo F. Padovanf2fcfcd2009-07-04 15:06:24 -0300367#define L2CAP_CONF_MAX_CONF_REQ 2
368#define L2CAP_CONF_MAX_CONF_RSP 2
369
Gustavo F. Padovanc74e5602009-08-20 22:25:58 -0300370#define L2CAP_CONN_SAR_SDU 0x01
Gustavo F. Padovan8f171542009-08-20 22:26:03 -0300371#define L2CAP_CONN_SREJ_SENT 0x02
Gustavo F. Padovane90bac02009-08-20 22:26:00 -0300372#define L2CAP_CONN_WAIT_F 0x04
Gustavo F. Padovanef54fd92009-08-20 22:26:04 -0300373#define L2CAP_CONN_SREJ_ACT 0x08
374#define L2CAP_CONN_SEND_PBIT 0x10
Gustavo F. Padovan2246b2f2009-08-26 04:04:02 -0300375#define L2CAP_CONN_REMOTE_BUSY 0x20
376#define L2CAP_CONN_LOCAL_BUSY 0x40
Gustavo F. Padovan4ec10d92009-10-03 02:34:39 -0300377#define L2CAP_CONN_REJ_ACT 0x80
Gustavo F. Padovane90bac02009-08-20 22:26:00 -0300378
379#define __mod_retrans_timer() mod_timer(&l2cap_pi(sk)->retrans_timer, \
380 jiffies + msecs_to_jiffies(L2CAP_DEFAULT_RETRANS_TO));
381#define __mod_monitor_timer() mod_timer(&l2cap_pi(sk)->monitor_timer, \
382 jiffies + msecs_to_jiffies(L2CAP_DEFAULT_MONITOR_TO));
Gustavo F. Padovanc74e5602009-08-20 22:25:58 -0300383
Gustavo F. Padovan1c2acff2009-08-20 22:25:57 -0300384static inline int l2cap_tx_window_full(struct sock *sk)
385{
386 struct l2cap_pinfo *pi = l2cap_pi(sk);
387 int sub;
388
389 sub = (pi->next_tx_seq - pi->expected_ack_seq) % 64;
390
391 if (sub < 0)
392 sub += 64;
393
394 return (sub == pi->remote_tx_win);
395}
396
397#define __get_txseq(ctrl) ((ctrl) & L2CAP_CTRL_TXSEQ) >> 1
398#define __get_reqseq(ctrl) ((ctrl) & L2CAP_CTRL_REQSEQ) >> 8
399#define __is_iframe(ctrl) !((ctrl) & L2CAP_CTRL_FRAME_TYPE)
400#define __is_sframe(ctrl) (ctrl) & L2CAP_CTRL_FRAME_TYPE
Gustavo F. Padovanc74e5602009-08-20 22:25:58 -0300401#define __is_sar_start(ctrl) ((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403void l2cap_load(void);
404
405#endif /* __L2CAP_H */