2 RFCOMM implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
4 Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License version 2 as
8 published by the Free Software Foundation;
10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21 SOFTWARE IS DISCLAIMED.
25 * Bluetooth RFCOMM core.
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/sched.h>
32 #include <linux/signal.h>
33 #include <linux/init.h>
34 #include <linux/wait.h>
35 #include <linux/device.h>
36 #include <linux/debugfs.h>
37 #include <linux/seq_file.h>
38 #include <linux/net.h>
39 #include <linux/mutex.h>
40 #include <linux/kthread.h>
41 #include <linux/slab.h>
44 #include <asm/uaccess.h>
45 #include <asm/unaligned.h>
47 #include <net/bluetooth/bluetooth.h>
48 #include <net/bluetooth/hci_core.h>
49 #include <net/bluetooth/l2cap.h>
50 #include <net/bluetooth/rfcomm.h>
52 #define VERSION "1.11"
54 static int disable_cfc = 0;
55 static int channel_mtu = -1;
56 static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
57 static int l2cap_ertm = 0;
59 static struct task_struct *rfcomm_thread;
61 static DEFINE_MUTEX(rfcomm_mutex);
62 #define rfcomm_lock() mutex_lock(&rfcomm_mutex)
63 #define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
65 static unsigned long rfcomm_event;
67 static LIST_HEAD(session_list);
69 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
70 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
71 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
72 static int rfcomm_queue_disc(struct rfcomm_dlc *d);
73 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
74 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
75 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
76 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
77 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
78 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
80 static void rfcomm_process_connect(struct rfcomm_session *s);
82 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
86 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
87 static void rfcomm_session_del(struct rfcomm_session *s);
89 /* ---- RFCOMM frame parsing macros ---- */
90 #define __get_dlci(b) ((b & 0xfc) >> 2)
91 #define __get_channel(b) ((b & 0xf8) >> 3)
92 #define __get_dir(b) ((b & 0x04) >> 2)
93 #define __get_type(b) ((b & 0xef))
95 #define __test_ea(b) ((b & 0x01))
96 #define __test_cr(b) ((b & 0x02))
97 #define __test_pf(b) ((b & 0x10))
99 #define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
100 #define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
101 #define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
102 #define __srv_channel(dlci) (dlci >> 1)
103 #define __dir(dlci) (dlci & 0x01)
105 #define __len8(len) (((len) << 1) | 1)
106 #define __len16(len) ((len) << 1)
109 #define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
110 #define __get_mcc_type(b) ((b & 0xfc) >> 2)
111 #define __get_mcc_len(b) ((b & 0xfe) >> 1)
114 #define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
115 #define __get_rpn_data_bits(line) ((line) & 0x3)
116 #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
117 #define __get_rpn_parity(line) (((line) >> 3) & 0x7)
119 static inline void rfcomm_schedule(void)
123 set_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
124 wake_up_process(rfcomm_thread);
127 static inline void rfcomm_session_put(struct rfcomm_session *s)
129 if (atomic_dec_and_test(&s->refcnt))
130 rfcomm_session_del(s);
133 /* ---- RFCOMM FCS computation ---- */
135 /* reversed, 8-bit, poly=0x07 */
136 static unsigned char rfcomm_crc_table[256] = {
137 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
138 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
139 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
140 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
142 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
143 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
144 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
145 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
147 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
148 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
149 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
150 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
152 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
153 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
154 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
155 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
157 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
158 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
159 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
160 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
162 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
163 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
164 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
165 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
167 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
168 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
169 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
170 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
172 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
173 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
174 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
175 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
179 #define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
182 static inline u8 __fcs(u8 *data)
184 return 0xff - __crc(data);
188 static inline u8 __fcs2(u8 *data)
190 return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]];
194 static inline int __check_fcs(u8 *data, int type, u8 fcs)
198 if (type != RFCOMM_UIH)
199 f = rfcomm_crc_table[f ^ data[2]];
201 return rfcomm_crc_table[f ^ fcs] != 0xcf;
204 /* ---- L2CAP callbacks ---- */
205 static void rfcomm_l2state_change(struct sock *sk)
207 BT_DBG("%p state %d", sk, sk->sk_state);
211 static void rfcomm_l2data_ready(struct sock *sk, int bytes)
213 BT_DBG("%p bytes %d", sk, bytes);
217 static int rfcomm_l2sock_create(struct socket **sock)
223 err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
225 struct sock *sk = (*sock)->sk;
226 sk->sk_data_ready = rfcomm_l2data_ready;
227 sk->sk_state_change = rfcomm_l2state_change;
232 static inline int rfcomm_check_security(struct rfcomm_dlc *d)
234 struct sock *sk = d->session->sock->sk;
237 switch (d->sec_level) {
238 case BT_SECURITY_HIGH:
239 auth_type = HCI_AT_GENERAL_BONDING_MITM;
241 case BT_SECURITY_MEDIUM:
242 auth_type = HCI_AT_GENERAL_BONDING;
245 auth_type = HCI_AT_NO_BONDING;
249 return hci_conn_security(l2cap_pi(sk)->conn->hcon, d->sec_level,
253 static void rfcomm_session_timeout(unsigned long arg)
255 struct rfcomm_session *s = (void *) arg;
257 BT_DBG("session %p state %ld", s, s->state);
259 set_bit(RFCOMM_TIMED_OUT, &s->flags);
263 static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout)
265 BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout);
267 if (!mod_timer(&s->timer, jiffies + timeout))
268 rfcomm_session_hold(s);
271 static void rfcomm_session_clear_timer(struct rfcomm_session *s)
273 BT_DBG("session %p state %ld", s, s->state);
275 if (timer_pending(&s->timer) && del_timer(&s->timer))
276 rfcomm_session_put(s);
279 /* ---- RFCOMM DLCs ---- */
280 static void rfcomm_dlc_timeout(unsigned long arg)
282 struct rfcomm_dlc *d = (void *) arg;
284 BT_DBG("dlc %p state %ld", d, d->state);
286 set_bit(RFCOMM_TIMED_OUT, &d->flags);
291 static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
293 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
295 if (!mod_timer(&d->timer, jiffies + timeout))
299 static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
301 BT_DBG("dlc %p state %ld", d, d->state);
303 if (timer_pending(&d->timer) && del_timer(&d->timer))
307 static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
314 d->mtu = RFCOMM_DEFAULT_MTU;
315 d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;
317 d->cfc = RFCOMM_CFC_DISABLED;
318 d->rx_credits = RFCOMM_DEFAULT_CREDITS;
321 struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
323 struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
328 setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d);
330 skb_queue_head_init(&d->tx_queue);
331 spin_lock_init(&d->lock);
332 atomic_set(&d->refcnt, 1);
334 rfcomm_dlc_clear_state(d);
341 void rfcomm_dlc_free(struct rfcomm_dlc *d)
345 skb_queue_purge(&d->tx_queue);
349 static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
351 BT_DBG("dlc %p session %p", d, s);
353 rfcomm_session_hold(s);
355 rfcomm_session_clear_timer(s);
357 list_add(&d->list, &s->dlcs);
361 static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
363 struct rfcomm_session *s = d->session;
365 BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s);
371 if (list_empty(&s->dlcs))
372 rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT);
374 rfcomm_session_put(s);
377 static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
379 struct rfcomm_dlc *d;
382 list_for_each(p, &s->dlcs) {
383 d = list_entry(p, struct rfcomm_dlc, list);
390 static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
392 struct rfcomm_session *s;
396 BT_DBG("dlc %p state %ld %s %s channel %d",
397 d, d->state, batostr(src), batostr(dst), channel);
399 if (channel < 1 || channel > 30)
402 if (d->state != BT_OPEN && d->state != BT_CLOSED)
405 s = rfcomm_session_get(src, dst);
407 s = rfcomm_session_create(src, dst, d->sec_level, &err);
412 dlci = __dlci(!s->initiator, channel);
414 /* Check if DLCI already exists */
415 if (rfcomm_dlc_get(s, dlci))
418 rfcomm_dlc_clear_state(d);
421 d->addr = __addr(s->initiator, dlci);
424 d->state = BT_CONFIG;
425 rfcomm_dlc_link(s, d);
430 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
432 if (s->state == BT_CONNECTED) {
433 if (rfcomm_check_security(d))
434 rfcomm_send_pn(s, 1, d);
436 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
439 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
444 int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
450 r = __rfcomm_dlc_open(d, src, dst, channel);
456 static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
458 struct rfcomm_session *s = d->session;
462 BT_DBG("dlc %p state %ld dlci %d err %d session %p",
463 d, d->state, d->dlci, err, s);
468 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
469 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
476 d->state = BT_DISCONN;
477 if (skb_queue_empty(&d->tx_queue)) {
478 rfcomm_send_disc(s, d->dlci);
479 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
481 rfcomm_queue_disc(d);
482 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
488 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
489 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
496 rfcomm_dlc_clear_timer(d);
499 d->state = BT_CLOSED;
500 d->state_change(d, err);
501 rfcomm_dlc_unlock(d);
503 skb_queue_purge(&d->tx_queue);
504 rfcomm_dlc_unlink(d);
510 int rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
516 r = __rfcomm_dlc_close(d, err);
522 int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
526 if (d->state != BT_CONNECTED)
529 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
534 rfcomm_make_uih(skb, d->addr);
535 skb_queue_tail(&d->tx_queue, skb);
537 if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
542 void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
544 BT_DBG("dlc %p state %ld", d, d->state);
547 d->v24_sig |= RFCOMM_V24_FC;
548 set_bit(RFCOMM_MSC_PENDING, &d->flags);
553 void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
555 BT_DBG("dlc %p state %ld", d, d->state);
558 d->v24_sig &= ~RFCOMM_V24_FC;
559 set_bit(RFCOMM_MSC_PENDING, &d->flags);
565 Set/get modem status functions use _local_ status i.e. what we report
567 Remote status is provided by dlc->modem_status() callback.
569 int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
571 BT_DBG("dlc %p state %ld v24_sig 0x%x",
572 d, d->state, v24_sig);
574 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
575 v24_sig |= RFCOMM_V24_FC;
577 v24_sig &= ~RFCOMM_V24_FC;
579 d->v24_sig = v24_sig;
581 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
587 int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
589 BT_DBG("dlc %p state %ld v24_sig 0x%x",
590 d, d->state, d->v24_sig);
592 *v24_sig = d->v24_sig;
596 /* ---- RFCOMM sessions ---- */
597 static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
599 struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);
604 BT_DBG("session %p sock %p", s, sock);
606 setup_timer(&s->timer, rfcomm_session_timeout, (unsigned long) s);
608 INIT_LIST_HEAD(&s->dlcs);
612 s->mtu = RFCOMM_DEFAULT_MTU;
613 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
615 /* Do not increment module usage count for listening sessions.
616 * Otherwise we won't be able to unload the module. */
617 if (state != BT_LISTEN)
618 if (!try_module_get(THIS_MODULE)) {
623 list_add(&s->list, &session_list);
628 static void rfcomm_session_del(struct rfcomm_session *s)
630 int state = s->state;
632 BT_DBG("session %p state %ld", s, s->state);
636 if (state == BT_CONNECTED)
637 rfcomm_send_disc(s, 0);
639 rfcomm_session_clear_timer(s);
640 sock_release(s->sock);
643 if (state != BT_LISTEN)
644 module_put(THIS_MODULE);
647 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
649 struct rfcomm_session *s;
650 struct list_head *p, *n;
652 list_for_each_safe(p, n, &session_list) {
653 s = list_entry(p, struct rfcomm_session, list);
654 sk = bt_sk(s->sock->sk);
656 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&sk->src, src)) &&
657 !bacmp(&sk->dst, dst))
663 static void rfcomm_session_close(struct rfcomm_session *s, int err)
665 struct rfcomm_dlc *d;
666 struct list_head *p, *n;
668 BT_DBG("session %p state %ld err %d", s, s->state, err);
670 rfcomm_session_hold(s);
672 s->state = BT_CLOSED;
675 list_for_each_safe(p, n, &s->dlcs) {
676 d = list_entry(p, struct rfcomm_dlc, list);
677 d->state = BT_CLOSED;
678 __rfcomm_dlc_close(d, err);
681 rfcomm_session_clear_timer(s);
682 rfcomm_session_put(s);
685 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
690 struct rfcomm_session *s = NULL;
691 struct sockaddr_l2 addr;
695 BT_DBG("%s %s", batostr(src), batostr(dst));
697 *err = rfcomm_l2sock_create(&sock);
701 bacpy(&addr.l2_bdaddr, src);
702 addr.l2_family = AF_BLUETOOTH;
705 *err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
709 /* Set L2CAP options */
712 l2cap_pi(sk)->imtu = l2cap_mtu;
713 l2cap_pi(sk)->sec_level = sec_level;
715 l2cap_pi(sk)->mode = L2CAP_MODE_ERTM;
718 s = rfcomm_session_add(sock, BT_BOUND);
726 bacpy(&addr.l2_bdaddr, dst);
727 addr.l2_family = AF_BLUETOOTH;
728 addr.l2_psm = cpu_to_le16(RFCOMM_PSM);
730 *err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
731 if (*err == 0 || *err == -EINPROGRESS)
734 rfcomm_session_del(s);
742 void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
744 struct sock *sk = s->sock->sk;
746 bacpy(src, &bt_sk(sk)->src);
748 bacpy(dst, &bt_sk(sk)->dst);
751 /* ---- RFCOMM frame sending ---- */
752 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
754 struct socket *sock = s->sock;
755 struct kvec iv = { data, len };
758 BT_DBG("session %p len %d", s, len);
760 memset(&msg, 0, sizeof(msg));
762 return kernel_sendmsg(sock, &msg, &iv, 1, len);
765 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
767 struct rfcomm_cmd cmd;
769 BT_DBG("%p dlci %d", s, dlci);
771 cmd.addr = __addr(s->initiator, dlci);
772 cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
774 cmd.fcs = __fcs2((u8 *) &cmd);
776 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
779 static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
781 struct rfcomm_cmd cmd;
783 BT_DBG("%p dlci %d", s, dlci);
785 cmd.addr = __addr(!s->initiator, dlci);
786 cmd.ctrl = __ctrl(RFCOMM_UA, 1);
788 cmd.fcs = __fcs2((u8 *) &cmd);
790 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
793 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
795 struct rfcomm_cmd cmd;
797 BT_DBG("%p dlci %d", s, dlci);
799 cmd.addr = __addr(s->initiator, dlci);
800 cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
802 cmd.fcs = __fcs2((u8 *) &cmd);
804 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
807 static int rfcomm_queue_disc(struct rfcomm_dlc *d)
809 struct rfcomm_cmd *cmd;
812 BT_DBG("dlc %p dlci %d", d, d->dlci);
814 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
818 cmd = (void *) __skb_put(skb, sizeof(*cmd));
820 cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
821 cmd->len = __len8(0);
822 cmd->fcs = __fcs2((u8 *) cmd);
824 skb_queue_tail(&d->tx_queue, skb);
829 static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
831 struct rfcomm_cmd cmd;
833 BT_DBG("%p dlci %d", s, dlci);
835 cmd.addr = __addr(!s->initiator, dlci);
836 cmd.ctrl = __ctrl(RFCOMM_DM, 1);
838 cmd.fcs = __fcs2((u8 *) &cmd);
840 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
843 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
845 struct rfcomm_hdr *hdr;
846 struct rfcomm_mcc *mcc;
847 u8 buf[16], *ptr = buf;
849 BT_DBG("%p cr %d type %d", s, cr, type);
851 hdr = (void *) ptr; ptr += sizeof(*hdr);
852 hdr->addr = __addr(s->initiator, 0);
853 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
854 hdr->len = __len8(sizeof(*mcc) + 1);
856 mcc = (void *) ptr; ptr += sizeof(*mcc);
857 mcc->type = __mcc_type(cr, RFCOMM_NSC);
858 mcc->len = __len8(1);
860 /* Type that we didn't like */
861 *ptr = __mcc_type(cr, type); ptr++;
863 *ptr = __fcs(buf); ptr++;
865 return rfcomm_send_frame(s, buf, ptr - buf);
868 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d)
870 struct rfcomm_hdr *hdr;
871 struct rfcomm_mcc *mcc;
872 struct rfcomm_pn *pn;
873 u8 buf[16], *ptr = buf;
875 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu);
877 hdr = (void *) ptr; ptr += sizeof(*hdr);
878 hdr->addr = __addr(s->initiator, 0);
879 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
880 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn));
882 mcc = (void *) ptr; ptr += sizeof(*mcc);
883 mcc->type = __mcc_type(cr, RFCOMM_PN);
884 mcc->len = __len8(sizeof(*pn));
886 pn = (void *) ptr; ptr += sizeof(*pn);
888 pn->priority = d->priority;
893 pn->flow_ctrl = cr ? 0xf0 : 0xe0;
894 pn->credits = RFCOMM_DEFAULT_CREDITS;
900 if (cr && channel_mtu >= 0)
901 pn->mtu = cpu_to_le16(channel_mtu);
903 pn->mtu = cpu_to_le16(d->mtu);
905 *ptr = __fcs(buf); ptr++;
907 return rfcomm_send_frame(s, buf, ptr - buf);
910 int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
911 u8 bit_rate, u8 data_bits, u8 stop_bits,
912 u8 parity, u8 flow_ctrl_settings,
913 u8 xon_char, u8 xoff_char, u16 param_mask)
915 struct rfcomm_hdr *hdr;
916 struct rfcomm_mcc *mcc;
917 struct rfcomm_rpn *rpn;
918 u8 buf[16], *ptr = buf;
920 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x"
921 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x",
922 s, cr, dlci, bit_rate, data_bits, stop_bits, parity,
923 flow_ctrl_settings, xon_char, xoff_char, param_mask);
925 hdr = (void *) ptr; ptr += sizeof(*hdr);
926 hdr->addr = __addr(s->initiator, 0);
927 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
928 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn));
930 mcc = (void *) ptr; ptr += sizeof(*mcc);
931 mcc->type = __mcc_type(cr, RFCOMM_RPN);
932 mcc->len = __len8(sizeof(*rpn));
934 rpn = (void *) ptr; ptr += sizeof(*rpn);
935 rpn->dlci = __addr(1, dlci);
936 rpn->bit_rate = bit_rate;
937 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity);
938 rpn->flow_ctrl = flow_ctrl_settings;
939 rpn->xon_char = xon_char;
940 rpn->xoff_char = xoff_char;
941 rpn->param_mask = cpu_to_le16(param_mask);
943 *ptr = __fcs(buf); ptr++;
945 return rfcomm_send_frame(s, buf, ptr - buf);
948 static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status)
950 struct rfcomm_hdr *hdr;
951 struct rfcomm_mcc *mcc;
952 struct rfcomm_rls *rls;
953 u8 buf[16], *ptr = buf;
955 BT_DBG("%p cr %d status 0x%x", s, cr, status);
957 hdr = (void *) ptr; ptr += sizeof(*hdr);
958 hdr->addr = __addr(s->initiator, 0);
959 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
960 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls));
962 mcc = (void *) ptr; ptr += sizeof(*mcc);
963 mcc->type = __mcc_type(cr, RFCOMM_RLS);
964 mcc->len = __len8(sizeof(*rls));
966 rls = (void *) ptr; ptr += sizeof(*rls);
967 rls->dlci = __addr(1, dlci);
968 rls->status = status;
970 *ptr = __fcs(buf); ptr++;
972 return rfcomm_send_frame(s, buf, ptr - buf);
975 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig)
977 struct rfcomm_hdr *hdr;
978 struct rfcomm_mcc *mcc;
979 struct rfcomm_msc *msc;
980 u8 buf[16], *ptr = buf;
982 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig);
984 hdr = (void *) ptr; ptr += sizeof(*hdr);
985 hdr->addr = __addr(s->initiator, 0);
986 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
987 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc));
989 mcc = (void *) ptr; ptr += sizeof(*mcc);
990 mcc->type = __mcc_type(cr, RFCOMM_MSC);
991 mcc->len = __len8(sizeof(*msc));
993 msc = (void *) ptr; ptr += sizeof(*msc);
994 msc->dlci = __addr(1, dlci);
995 msc->v24_sig = v24_sig | 0x01;
997 *ptr = __fcs(buf); ptr++;
999 return rfcomm_send_frame(s, buf, ptr - buf);
1002 static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr)
1004 struct rfcomm_hdr *hdr;
1005 struct rfcomm_mcc *mcc;
1006 u8 buf[16], *ptr = buf;
1008 BT_DBG("%p cr %d", s, cr);
1010 hdr = (void *) ptr; ptr += sizeof(*hdr);
1011 hdr->addr = __addr(s->initiator, 0);
1012 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1013 hdr->len = __len8(sizeof(*mcc));
1015 mcc = (void *) ptr; ptr += sizeof(*mcc);
1016 mcc->type = __mcc_type(cr, RFCOMM_FCOFF);
1017 mcc->len = __len8(0);
1019 *ptr = __fcs(buf); ptr++;
1021 return rfcomm_send_frame(s, buf, ptr - buf);
1024 static int rfcomm_send_fcon(struct rfcomm_session *s, int cr)
1026 struct rfcomm_hdr *hdr;
1027 struct rfcomm_mcc *mcc;
1028 u8 buf[16], *ptr = buf;
1030 BT_DBG("%p cr %d", s, cr);
1032 hdr = (void *) ptr; ptr += sizeof(*hdr);
1033 hdr->addr = __addr(s->initiator, 0);
1034 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1035 hdr->len = __len8(sizeof(*mcc));
1037 mcc = (void *) ptr; ptr += sizeof(*mcc);
1038 mcc->type = __mcc_type(cr, RFCOMM_FCON);
1039 mcc->len = __len8(0);
1041 *ptr = __fcs(buf); ptr++;
1043 return rfcomm_send_frame(s, buf, ptr - buf);
1046 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len)
1048 struct socket *sock = s->sock;
1051 unsigned char hdr[5], crc[1];
1056 BT_DBG("%p cr %d", s, cr);
1058 hdr[0] = __addr(s->initiator, 0);
1059 hdr[1] = __ctrl(RFCOMM_UIH, 0);
1060 hdr[2] = 0x01 | ((len + 2) << 1);
1061 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2);
1062 hdr[4] = 0x01 | (len << 1);
1064 crc[0] = __fcs(hdr);
1066 iv[0].iov_base = hdr;
1068 iv[1].iov_base = pattern;
1069 iv[1].iov_len = len;
1070 iv[2].iov_base = crc;
1073 memset(&msg, 0, sizeof(msg));
1075 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len);
1078 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits)
1080 struct rfcomm_hdr *hdr;
1081 u8 buf[16], *ptr = buf;
1083 BT_DBG("%p addr %d credits %d", s, addr, credits);
1085 hdr = (void *) ptr; ptr += sizeof(*hdr);
1087 hdr->ctrl = __ctrl(RFCOMM_UIH, 1);
1088 hdr->len = __len8(0);
1090 *ptr = credits; ptr++;
1092 *ptr = __fcs(buf); ptr++;
1094 return rfcomm_send_frame(s, buf, ptr - buf);
1097 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr)
1099 struct rfcomm_hdr *hdr;
1104 hdr = (void *) skb_push(skb, 4);
1105 put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len);
1107 hdr = (void *) skb_push(skb, 3);
1108 hdr->len = __len8(len);
1111 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1113 crc = skb_put(skb, 1);
1114 *crc = __fcs((void *) hdr);
1117 /* ---- RFCOMM frame reception ---- */
1118 static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
1120 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1124 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1126 rfcomm_send_dm(s, dlci);
1132 rfcomm_dlc_clear_timer(d);
1135 d->state = BT_CONNECTED;
1136 d->state_change(d, 0);
1137 rfcomm_dlc_unlock(d);
1139 rfcomm_send_msc(s, 1, dlci, d->v24_sig);
1143 d->state = BT_CLOSED;
1144 __rfcomm_dlc_close(d, 0);
1146 if (list_empty(&s->dlcs)) {
1147 s->state = BT_DISCONN;
1148 rfcomm_send_disc(s, 0);
1154 /* Control channel */
1157 s->state = BT_CONNECTED;
1158 rfcomm_process_connect(s);
1162 /* When socket is closed and we are not RFCOMM
1163 * initiator rfcomm_process_rx already calls
1164 * rfcomm_session_put() */
1165 if (s->sock->sk->sk_state != BT_CLOSED)
1166 rfcomm_session_put(s);
1173 static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
1177 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1181 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1183 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1188 d->state = BT_CLOSED;
1189 __rfcomm_dlc_close(d, err);
1192 if (s->state == BT_CONNECT)
1197 s->state = BT_CLOSED;
1198 rfcomm_session_close(s, err);
1203 static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci)
1207 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1210 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1212 rfcomm_send_ua(s, dlci);
1214 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1219 d->state = BT_CLOSED;
1220 __rfcomm_dlc_close(d, err);
1222 rfcomm_send_dm(s, dlci);
1225 rfcomm_send_ua(s, 0);
1227 if (s->state == BT_CONNECT)
1232 s->state = BT_CLOSED;
1233 rfcomm_session_close(s, err);
1239 void rfcomm_dlc_accept(struct rfcomm_dlc *d)
1241 struct sock *sk = d->session->sock->sk;
1243 BT_DBG("dlc %p", d);
1245 rfcomm_send_ua(d->session, d->dlci);
1247 rfcomm_dlc_clear_timer(d);
1250 d->state = BT_CONNECTED;
1251 d->state_change(d, 0);
1252 rfcomm_dlc_unlock(d);
1255 hci_conn_switch_role(l2cap_pi(sk)->conn->hcon, 0x00);
1257 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1260 static void rfcomm_check_accept(struct rfcomm_dlc *d)
1262 if (rfcomm_check_security(d)) {
1263 if (d->defer_setup) {
1264 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1265 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1268 d->state = BT_CONNECT2;
1269 d->state_change(d, 0);
1270 rfcomm_dlc_unlock(d);
1272 rfcomm_dlc_accept(d);
1274 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1275 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1279 static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
1281 struct rfcomm_dlc *d;
1284 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1287 rfcomm_send_ua(s, 0);
1289 if (s->state == BT_OPEN) {
1290 s->state = BT_CONNECTED;
1291 rfcomm_process_connect(s);
1296 /* Check if DLC exists */
1297 d = rfcomm_dlc_get(s, dlci);
1299 if (d->state == BT_OPEN) {
1300 /* DLC was previously opened by PN request */
1301 rfcomm_check_accept(d);
1306 /* Notify socket layer about incoming connection */
1307 channel = __srv_channel(dlci);
1308 if (rfcomm_connect_ind(s, channel, &d)) {
1310 d->addr = __addr(s->initiator, dlci);
1311 rfcomm_dlc_link(s, d);
1313 rfcomm_check_accept(d);
1315 rfcomm_send_dm(s, dlci);
1321 static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
1323 struct rfcomm_session *s = d->session;
1325 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
1326 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
1328 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
1329 pn->flow_ctrl == 0xe0) {
1330 d->cfc = RFCOMM_CFC_ENABLED;
1331 d->tx_credits = pn->credits;
1333 d->cfc = RFCOMM_CFC_DISABLED;
1334 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1337 if (s->cfc == RFCOMM_CFC_UNKNOWN)
1340 d->priority = pn->priority;
1342 d->mtu = __le16_to_cpu(pn->mtu);
1344 if (cr && d->mtu > s->mtu)
1350 static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1352 struct rfcomm_pn *pn = (void *) skb->data;
1353 struct rfcomm_dlc *d;
1356 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1361 d = rfcomm_dlc_get(s, dlci);
1365 rfcomm_apply_pn(d, cr, pn);
1366 rfcomm_send_pn(s, 0, d);
1371 rfcomm_apply_pn(d, cr, pn);
1373 d->state = BT_CONNECT;
1374 rfcomm_send_sabm(s, d->dlci);
1379 u8 channel = __srv_channel(dlci);
1384 /* PN request for non existing DLC.
1385 * Assume incoming connection. */
1386 if (rfcomm_connect_ind(s, channel, &d)) {
1388 d->addr = __addr(s->initiator, dlci);
1389 rfcomm_dlc_link(s, d);
1391 rfcomm_apply_pn(d, cr, pn);
1394 rfcomm_send_pn(s, 0, d);
1396 rfcomm_send_dm(s, dlci);
1402 static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
1404 struct rfcomm_rpn *rpn = (void *) skb->data;
1405 u8 dlci = __get_dlci(rpn->dlci);
1414 u16 rpn_mask = RFCOMM_RPN_PM_ALL;
1416 BT_DBG("dlci %d cr %d len 0x%x bitr 0x%x line 0x%x flow 0x%x xonc 0x%x xoffc 0x%x pm 0x%x",
1417 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
1418 rpn->xon_char, rpn->xoff_char, rpn->param_mask);
1424 /* This is a request, return default (according to ETSI TS 07.10) settings */
1425 bit_rate = RFCOMM_RPN_BR_9600;
1426 data_bits = RFCOMM_RPN_DATA_8;
1427 stop_bits = RFCOMM_RPN_STOP_1;
1428 parity = RFCOMM_RPN_PARITY_NONE;
1429 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1430 xon_char = RFCOMM_RPN_XON_CHAR;
1431 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1435 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
1436 * no parity, no flow control lines, normal XON/XOFF chars */
1438 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
1439 bit_rate = rpn->bit_rate;
1440 if (bit_rate > RFCOMM_RPN_BR_230400) {
1441 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
1442 bit_rate = RFCOMM_RPN_BR_9600;
1443 rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
1447 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
1448 data_bits = __get_rpn_data_bits(rpn->line_settings);
1449 if (data_bits != RFCOMM_RPN_DATA_8) {
1450 BT_DBG("RPN data bits mismatch 0x%x", data_bits);
1451 data_bits = RFCOMM_RPN_DATA_8;
1452 rpn_mask ^= RFCOMM_RPN_PM_DATA;
1456 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
1457 stop_bits = __get_rpn_stop_bits(rpn->line_settings);
1458 if (stop_bits != RFCOMM_RPN_STOP_1) {
1459 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
1460 stop_bits = RFCOMM_RPN_STOP_1;
1461 rpn_mask ^= RFCOMM_RPN_PM_STOP;
1465 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
1466 parity = __get_rpn_parity(rpn->line_settings);
1467 if (parity != RFCOMM_RPN_PARITY_NONE) {
1468 BT_DBG("RPN parity mismatch 0x%x", parity);
1469 parity = RFCOMM_RPN_PARITY_NONE;
1470 rpn_mask ^= RFCOMM_RPN_PM_PARITY;
1474 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
1475 flow_ctrl = rpn->flow_ctrl;
1476 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
1477 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
1478 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1479 rpn_mask ^= RFCOMM_RPN_PM_FLOW;
1483 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
1484 xon_char = rpn->xon_char;
1485 if (xon_char != RFCOMM_RPN_XON_CHAR) {
1486 BT_DBG("RPN XON char mismatch 0x%x", xon_char);
1487 xon_char = RFCOMM_RPN_XON_CHAR;
1488 rpn_mask ^= RFCOMM_RPN_PM_XON;
1492 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
1493 xoff_char = rpn->xoff_char;
1494 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
1495 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
1496 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1497 rpn_mask ^= RFCOMM_RPN_PM_XOFF;
1502 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
1503 parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
1508 static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1510 struct rfcomm_rls *rls = (void *) skb->data;
1511 u8 dlci = __get_dlci(rls->dlci);
1513 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
1518 /* We should probably do something with this information here. But
1519 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
1520 * mandatory to recognise and respond to RLS */
1522 rfcomm_send_rls(s, 0, dlci, rls->status);
1527 static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1529 struct rfcomm_msc *msc = (void *) skb->data;
1530 struct rfcomm_dlc *d;
1531 u8 dlci = __get_dlci(msc->dlci);
1533 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);
1535 d = rfcomm_dlc_get(s, dlci);
1540 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
1541 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1543 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1547 d->remote_v24_sig = msc->v24_sig;
1549 if (d->modem_status)
1550 d->modem_status(d, msc->v24_sig);
1552 rfcomm_dlc_unlock(d);
1554 rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
1556 d->mscex |= RFCOMM_MSCEX_RX;
1558 d->mscex |= RFCOMM_MSCEX_TX;
1563 static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
1565 struct rfcomm_mcc *mcc = (void *) skb->data;
1568 cr = __test_cr(mcc->type);
1569 type = __get_mcc_type(mcc->type);
1570 len = __get_mcc_len(mcc->len);
1572 BT_DBG("%p type 0x%x cr %d", s, type, cr);
1578 rfcomm_recv_pn(s, cr, skb);
1582 rfcomm_recv_rpn(s, cr, len, skb);
1586 rfcomm_recv_rls(s, cr, skb);
1590 rfcomm_recv_msc(s, cr, skb);
1595 set_bit(RFCOMM_TX_THROTTLED, &s->flags);
1596 rfcomm_send_fcoff(s, 0);
1602 clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
1603 rfcomm_send_fcon(s, 0);
1609 rfcomm_send_test(s, 0, skb->data, skb->len);
1616 BT_ERR("Unknown control type 0x%02x", type);
1617 rfcomm_send_nsc(s, cr, type);
1623 static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
1625 struct rfcomm_dlc *d;
1627 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);
1629 d = rfcomm_dlc_get(s, dlci);
1631 rfcomm_send_dm(s, dlci);
1636 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
1638 d->tx_credits += credits;
1640 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1643 if (skb->len && d->state == BT_CONNECTED) {
1646 d->data_ready(d, skb);
1647 rfcomm_dlc_unlock(d);
1656 static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb)
1658 struct rfcomm_hdr *hdr = (void *) skb->data;
1661 dlci = __get_dlci(hdr->addr);
1662 type = __get_type(hdr->ctrl);
1665 skb->len--; skb->tail--;
1666 fcs = *(u8 *)skb_tail_pointer(skb);
1668 if (__check_fcs(skb->data, type, fcs)) {
1669 BT_ERR("bad checksum in packet");
1674 if (__test_ea(hdr->len))
1681 if (__test_pf(hdr->ctrl))
1682 rfcomm_recv_sabm(s, dlci);
1686 if (__test_pf(hdr->ctrl))
1687 rfcomm_recv_disc(s, dlci);
1691 if (__test_pf(hdr->ctrl))
1692 rfcomm_recv_ua(s, dlci);
1696 rfcomm_recv_dm(s, dlci);
1701 return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
1703 rfcomm_recv_mcc(s, skb);
1707 BT_ERR("Unknown packet type 0x%02x", type);
1714 /* ---- Connection and data processing ---- */
1716 static void rfcomm_process_connect(struct rfcomm_session *s)
1718 struct rfcomm_dlc *d;
1719 struct list_head *p, *n;
1721 BT_DBG("session %p state %ld", s, s->state);
1723 list_for_each_safe(p, n, &s->dlcs) {
1724 d = list_entry(p, struct rfcomm_dlc, list);
1725 if (d->state == BT_CONFIG) {
1727 if (rfcomm_check_security(d)) {
1728 rfcomm_send_pn(s, 1, d);
1730 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1731 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1737 /* Send data queued for the DLC.
1738 * Return number of frames left in the queue.
1740 static inline int rfcomm_process_tx(struct rfcomm_dlc *d)
1742 struct sk_buff *skb;
1745 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
1746 d, d->state, d->cfc, d->rx_credits, d->tx_credits);
1748 /* Send pending MSC */
1749 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
1750 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1754 * Give them some credits */
1755 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
1756 d->rx_credits <= (d->cfc >> 2)) {
1757 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
1758 d->rx_credits = d->cfc;
1762 * Give ourselves some credits */
1766 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
1767 return skb_queue_len(&d->tx_queue);
1769 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
1770 err = rfcomm_send_frame(d->session, skb->data, skb->len);
1772 skb_queue_head(&d->tx_queue, skb);
1779 if (d->cfc && !d->tx_credits) {
1780 /* We're out of TX credits.
1781 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
1782 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1785 return skb_queue_len(&d->tx_queue);
1788 static inline void rfcomm_process_dlcs(struct rfcomm_session *s)
1790 struct rfcomm_dlc *d;
1791 struct list_head *p, *n;
1793 BT_DBG("session %p state %ld", s, s->state);
1795 list_for_each_safe(p, n, &s->dlcs) {
1796 d = list_entry(p, struct rfcomm_dlc, list);
1798 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
1799 __rfcomm_dlc_close(d, ETIMEDOUT);
1803 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
1804 rfcomm_dlc_clear_timer(d);
1806 rfcomm_send_pn(s, 1, d);
1807 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
1809 if (d->defer_setup) {
1810 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1811 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1814 d->state = BT_CONNECT2;
1815 d->state_change(d, 0);
1816 rfcomm_dlc_unlock(d);
1818 rfcomm_dlc_accept(d);
1821 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
1822 rfcomm_dlc_clear_timer(d);
1824 rfcomm_send_dm(s, d->dlci);
1826 d->state = BT_CLOSED;
1827 __rfcomm_dlc_close(d, ECONNREFUSED);
1831 if (test_bit(RFCOMM_SEC_PENDING, &d->flags))
1834 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
1837 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
1838 d->mscex == RFCOMM_MSCEX_OK)
1839 rfcomm_process_tx(d);
1843 static inline void rfcomm_process_rx(struct rfcomm_session *s)
1845 struct socket *sock = s->sock;
1846 struct sock *sk = sock->sk;
1847 struct sk_buff *skb;
1849 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));
1851 /* Get data directly from socket receive queue without copying it. */
1852 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
1854 rfcomm_recv_frame(s, skb);
1857 if (sk->sk_state == BT_CLOSED) {
1859 rfcomm_session_put(s);
1861 rfcomm_session_close(s, sk->sk_err);
1865 static inline void rfcomm_accept_connection(struct rfcomm_session *s)
1867 struct socket *sock = s->sock, *nsock;
1870 /* Fast check for a new connection.
1871 * Avoids unnesesary socket allocations. */
1872 if (list_empty(&bt_sk(sock->sk)->accept_q))
1875 BT_DBG("session %p", s);
1877 err = kernel_accept(sock, &nsock, O_NONBLOCK);
1881 /* Set our callbacks */
1882 nsock->sk->sk_data_ready = rfcomm_l2data_ready;
1883 nsock->sk->sk_state_change = rfcomm_l2state_change;
1885 s = rfcomm_session_add(nsock, BT_OPEN);
1887 rfcomm_session_hold(s);
1889 /* We should adjust MTU on incoming sessions.
1890 * L2CAP MTU minus UIH header and FCS. */
1891 s->mtu = min(l2cap_pi(nsock->sk)->omtu, l2cap_pi(nsock->sk)->imtu) - 5;
1895 sock_release(nsock);
1898 static inline void rfcomm_check_connection(struct rfcomm_session *s)
1900 struct sock *sk = s->sock->sk;
1902 BT_DBG("%p state %ld", s, s->state);
1904 switch(sk->sk_state) {
1906 s->state = BT_CONNECT;
1908 /* We can adjust MTU on outgoing sessions.
1909 * L2CAP MTU minus UIH header and FCS. */
1910 s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5;
1912 rfcomm_send_sabm(s, 0);
1916 s->state = BT_CLOSED;
1917 rfcomm_session_close(s, sk->sk_err);
1922 static inline void rfcomm_process_sessions(void)
1924 struct list_head *p, *n;
1928 list_for_each_safe(p, n, &session_list) {
1929 struct rfcomm_session *s;
1930 s = list_entry(p, struct rfcomm_session, list);
1932 if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
1933 s->state = BT_DISCONN;
1934 rfcomm_send_disc(s, 0);
1935 rfcomm_session_put(s);
1939 if (s->state == BT_LISTEN) {
1940 rfcomm_accept_connection(s);
1944 rfcomm_session_hold(s);
1948 rfcomm_check_connection(s);
1952 rfcomm_process_rx(s);
1956 rfcomm_process_dlcs(s);
1958 rfcomm_session_put(s);
1964 static int rfcomm_add_listener(bdaddr_t *ba)
1966 struct sockaddr_l2 addr;
1967 struct socket *sock;
1969 struct rfcomm_session *s;
1973 err = rfcomm_l2sock_create(&sock);
1975 BT_ERR("Create socket failed %d", err);
1980 bacpy(&addr.l2_bdaddr, ba);
1981 addr.l2_family = AF_BLUETOOTH;
1982 addr.l2_psm = cpu_to_le16(RFCOMM_PSM);
1984 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
1986 BT_ERR("Bind failed %d", err);
1990 /* Set L2CAP options */
1993 l2cap_pi(sk)->imtu = l2cap_mtu;
1996 /* Start listening on the socket */
1997 err = kernel_listen(sock, 10);
1999 BT_ERR("Listen failed %d", err);
2003 /* Add listening session */
2004 s = rfcomm_session_add(sock, BT_LISTEN);
2008 rfcomm_session_hold(s);
2015 static void rfcomm_kill_listener(void)
2017 struct rfcomm_session *s;
2018 struct list_head *p, *n;
2022 list_for_each_safe(p, n, &session_list) {
2023 s = list_entry(p, struct rfcomm_session, list);
2024 rfcomm_session_del(s);
2028 static int rfcomm_run(void *unused)
2032 set_user_nice(current, -10);
2034 rfcomm_add_listener(BDADDR_ANY);
2036 while (!kthread_should_stop()) {
2037 set_current_state(TASK_INTERRUPTIBLE);
2038 if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) {
2039 /* No pending events. Let's sleep.
2040 * Incoming connections and data will wake us up. */
2043 set_current_state(TASK_RUNNING);
2046 clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
2047 rfcomm_process_sessions();
2050 rfcomm_kill_listener();
2055 static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
2057 struct rfcomm_session *s;
2058 struct rfcomm_dlc *d;
2059 struct list_head *p, *n;
2061 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
2063 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
2067 rfcomm_session_hold(s);
2069 list_for_each_safe(p, n, &s->dlcs) {
2070 d = list_entry(p, struct rfcomm_dlc, list);
2072 if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
2073 rfcomm_dlc_clear_timer(d);
2074 if (status || encrypt == 0x00) {
2075 __rfcomm_dlc_close(d, ECONNREFUSED);
2080 if (d->state == BT_CONNECTED && !status && encrypt == 0x00) {
2081 if (d->sec_level == BT_SECURITY_MEDIUM) {
2082 set_bit(RFCOMM_SEC_PENDING, &d->flags);
2083 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
2085 } else if (d->sec_level == BT_SECURITY_HIGH) {
2086 __rfcomm_dlc_close(d, ECONNREFUSED);
2091 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
2095 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
2097 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
2100 rfcomm_session_put(s);
2105 static struct hci_cb rfcomm_cb = {
2107 .security_cfm = rfcomm_security_cfm
2110 static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
2112 struct rfcomm_session *s;
2113 struct list_head *pp, *p;
2117 list_for_each(p, &session_list) {
2118 s = list_entry(p, struct rfcomm_session, list);
2119 list_for_each(pp, &s->dlcs) {
2120 struct sock *sk = s->sock->sk;
2121 struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list);
2123 seq_printf(f, "%s %s %ld %d %d %d %d\n",
2124 batostr(&bt_sk(sk)->src),
2125 batostr(&bt_sk(sk)->dst),
2126 d->state, d->dlci, d->mtu,
2127 d->rx_credits, d->tx_credits);
2136 static int rfcomm_dlc_debugfs_open(struct inode *inode, struct file *file)
2138 return single_open(file, rfcomm_dlc_debugfs_show, inode->i_private);
2141 static const struct file_operations rfcomm_dlc_debugfs_fops = {
2142 .open = rfcomm_dlc_debugfs_open,
2144 .llseek = seq_lseek,
2145 .release = single_release,
2148 static struct dentry *rfcomm_dlc_debugfs;
2150 /* ---- Initialization ---- */
2151 static int __init rfcomm_init(void)
2157 hci_register_cb(&rfcomm_cb);
2159 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
2160 if (IS_ERR(rfcomm_thread)) {
2161 err = PTR_ERR(rfcomm_thread);
2166 rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
2167 bt_debugfs, NULL, &rfcomm_dlc_debugfs_fops);
2168 if (!rfcomm_dlc_debugfs)
2169 BT_ERR("Failed to create RFCOMM debug file");
2172 err = rfcomm_init_ttys();
2176 err = rfcomm_init_sockets();
2180 BT_INFO("RFCOMM ver %s", VERSION);
2185 rfcomm_cleanup_ttys();
2188 kthread_stop(rfcomm_thread);
2191 hci_unregister_cb(&rfcomm_cb);
2196 static void __exit rfcomm_exit(void)
2198 debugfs_remove(rfcomm_dlc_debugfs);
2200 hci_unregister_cb(&rfcomm_cb);
2202 kthread_stop(rfcomm_thread);
2204 rfcomm_cleanup_ttys();
2206 rfcomm_cleanup_sockets();
2209 module_init(rfcomm_init);
2210 module_exit(rfcomm_exit);
2212 module_param(disable_cfc, bool, 0644);
2213 MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
2215 module_param(channel_mtu, int, 0644);
2216 MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
2218 module_param(l2cap_mtu, uint, 0644);
2219 MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
2221 module_param(l2cap_ertm, bool, 0644);
2222 MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection");
2224 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
2225 MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
2226 MODULE_VERSION(VERSION);
2227 MODULE_LICENSE("GPL");
2228 MODULE_ALIAS("bt-proto-3");