[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / cmtp / core.c

/*
   CMTP implementation for Linux Bluetooth stack (BlueZ).
   Copyright (C) 2002-2003 Marcel Holtmann <marcel@holtmann.org>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
   SOFTWARE IS DISCLAIMED.
*/

#include <linux/module.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
#include <linux/freezer.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/ioctl.h>
#include <linux/file.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <net/sock.h>

#include <linux/isdn/capilli.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/l2cap.h>

#include "cmtp.h"

#define VERSION "1.0"

static DECLARE_RWSEM(cmtp_session_sem);
static LIST_HEAD(cmtp_session_list);

static struct cmtp_session *__cmtp_get_session(bdaddr_t *bdaddr)
{
	struct cmtp_session *session;

	BT_DBG("");

	list_for_each_entry(session, &cmtp_session_list, list)
		if (!bacmp(bdaddr, &session->bdaddr))
			return session;

	return NULL;
}

static void __cmtp_link_session(struct cmtp_session *session)
{
	list_add(&session->list, &cmtp_session_list);
}

static void __cmtp_unlink_session(struct cmtp_session *session)
{
	list_del(&session->list);
}

static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci)
{
	memset(ci, 0, sizeof(*ci));
	bacpy(&ci->bdaddr, &session->bdaddr);

	ci->flags = session->flags;
	ci->state = session->state;

	ci->num = session->num;
}


static inline int cmtp_alloc_block_id(struct cmtp_session *session)
{
	int i, id = -1;

	for (i = 0; i < 16; i++)
		if (!test_and_set_bit(i, &session->blockids)) {
			id = i;
			break;
		}

	return id;
}

static inline void cmtp_free_block_id(struct cmtp_session *session, int id)
{
	clear_bit(id, &session->blockids);
}

static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count)
{
	struct sk_buff *skb = session->reassembly[id], *nskb;
	int size;

	BT_DBG("session %p buf %p count %d", session, buf, count);

	size = (skb) ? skb->len + count : count;

	nskb = alloc_skb(size, GFP_ATOMIC);
	if (!nskb) {
		BT_ERR("Can't allocate memory for CAPI message");
		return;
	}

	if (skb && (skb->len > 0))
		skb_copy_from_linear_data(skb, skb_put(nskb, skb->len), skb->len);

	memcpy(skb_put(nskb, count), buf, count);

	session->reassembly[id] = nskb;

	kfree_skb(skb);
}

static inline int cmtp_recv_frame(struct cmtp_session *session, struct sk_buff *skb)
{
	__u8 hdr, hdrlen, id;
	__u16 len;

	BT_DBG("session %p skb %p len %d", session, skb, skb->len);

	while (skb->len > 0) {
		hdr = skb->data[0];

		switch (hdr & 0xc0) {
		case 0x40:
			hdrlen = 2;
			len = skb->data[1];
			break;
		case 0x80:
			hdrlen = 3;
			len = skb->data[1] | (skb->data[2] << 8);
			break;
		default:
			hdrlen = 1;
			len = 0;
			break;
		}

		id = (hdr & 0x3c) >> 2;

		BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id);

		if (hdrlen + len > skb->len) {
			BT_ERR("Wrong size or header information in CMTP frame");
			break;
		}

		if (len == 0) {
			skb_pull(skb, hdrlen);
			continue;
		}

		switch (hdr & 0x03) {
		case 0x00:
			cmtp_add_msgpart(session, id, skb->data + hdrlen, len);
			cmtp_recv_capimsg(session, session->reassembly[id]);
			session->reassembly[id] = NULL;
			break;
		case 0x01:
			cmtp_add_msgpart(session, id, skb->data + hdrlen, len);
			break;
		default:
			if (session->reassembly[id] != NULL)
				kfree_skb(session->reassembly[id]);
			session->reassembly[id] = NULL;
			break;
		}

		skb_pull(skb, hdrlen + len);
	}

	kfree_skb(skb);
	return 0;
}

static int cmtp_send_frame(struct cmtp_session *session, unsigned char *data, int len)
{
	struct socket *sock = session->sock;
	struct kvec iv = { data, len };
	struct msghdr msg;

	BT_DBG("session %p data %p len %d", session, data, len);

	if (!len)
		return 0;

	memset(&msg, 0, sizeof(msg));

	return kernel_sendmsg(sock, &msg, &iv, 1, len);
}

static void cmtp_process_transmit(struct cmtp_session *session)
{
	struct sk_buff *skb, *nskb;
	unsigned char *hdr;
	unsigned int size, tail;

	BT_DBG("session %p", session);

	nskb = alloc_skb(session->mtu, GFP_ATOMIC);
	if (!nskb) {
		BT_ERR("Can't allocate memory for new frame");
		return;
	}

	while ((skb = skb_dequeue(&session->transmit))) {
		struct cmtp_scb *scb = (void *) skb->cb;

		tail = session->mtu - nskb->len;
		if (tail < 5) {
			cmtp_send_frame(session, nskb->data, nskb->len);
			skb_trim(nskb, 0);
			tail = session->mtu;
		}

		size = min_t(uint, ((tail < 258) ? (tail - 2) : (tail - 3)), skb->len);

		if (scb->id < 0) {
			scb->id = cmtp_alloc_block_id(session);
			if (scb->id < 0) {
				skb_queue_head(&session->transmit, skb);
				break;
			}
		}

		if (size < 256) {
			hdr = skb_put(nskb, 2);
			hdr[0] = 0x40
				| ((scb->id << 2) & 0x3c)
				| ((skb->len == size) ? 0x00 : 0x01);
			hdr[1] = size;
		} else {
			hdr = skb_put(nskb, 3);
			hdr[0] = 0x80
				| ((scb->id << 2) & 0x3c)
				| ((skb->len == size) ? 0x00 : 0x01);
			hdr[1] = size & 0xff;
			hdr[2] = size >> 8;
		}

		skb_copy_from_linear_data(skb, skb_put(nskb, size), size);
		skb_pull(skb, size);

		if (skb->len > 0) {
			skb_queue_head(&session->transmit, skb);
		} else {
			cmtp_free_block_id(session, scb->id);
			if (scb->data) {
				cmtp_send_frame(session, nskb->data, nskb->len);
				skb_trim(nskb, 0);
			}
			kfree_skb(skb);
		}
	}

	cmtp_send_frame(session, nskb->data, nskb->len);

	kfree_skb(nskb);
}

static int cmtp_session(void *arg)
{
	struct cmtp_session *session = arg;
	struct sock *sk = session->sock->sk;
	struct sk_buff *skb;
	wait_queue_t wait;

	BT_DBG("session %p", session);

	set_user_nice(current, -15);

	init_waitqueue_entry(&wait, current);
	add_wait_queue(sk_sleep(sk), &wait);
	while (1) {
		set_current_state(TASK_INTERRUPTIBLE);

		if (atomic_read(&session->terminate))
			break;
		if (sk->sk_state != BT_CONNECTED)
			break;

		while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
			skb_orphan(skb);
			if (!skb_linearize(skb))
				cmtp_recv_frame(session, skb);
			else
				kfree_skb(skb);
		}

		cmtp_process_transmit(session);

		schedule();
	}
	__set_current_state(TASK_RUNNING);
	remove_wait_queue(sk_sleep(sk), &wait);

	down_write(&cmtp_session_sem);

	if (!(session->flags & (1 << CMTP_LOOPBACK)))
		cmtp_detach_device(session);

	fput(session->sock->file);

	__cmtp_unlink_session(session);

	up_write(&cmtp_session_sem);

	kfree(session);
	module_put_and_exit(0);
	return 0;
}

int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock)
{
	struct cmtp_session *session, *s;
	int i, err;

	BT_DBG("");

	if (!l2cap_is_socket(sock))
		return -EBADFD;

	session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL);
	if (!session)
		return -ENOMEM;

	down_write(&cmtp_session_sem);

	s = __cmtp_get_session(&bt_sk(sock->sk)->dst);
	if (s && s->state == BT_CONNECTED) {
		err = -EEXIST;
		goto failed;
	}

	bacpy(&session->bdaddr, &bt_sk(sock->sk)->dst);

	session->mtu = min_t(uint, l2cap_pi(sock->sk)->chan->omtu,
					l2cap_pi(sock->sk)->chan->imtu);

	BT_DBG("mtu %d", session->mtu);

	sprintf(session->name, "%pMR", &bt_sk(sock->sk)->dst);

	session->sock  = sock;
	session->state = BT_CONFIG;

	init_waitqueue_head(&session->wait);

	session->msgnum = CMTP_INITIAL_MSGNUM;

	INIT_LIST_HEAD(&session->applications);

	skb_queue_head_init(&session->transmit);

	for (i = 0; i < 16; i++)
		session->reassembly[i] = NULL;

	session->flags = req->flags;

	__cmtp_link_session(session);

	__module_get(THIS_MODULE);
	session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d",
								session->num);
	if (IS_ERR(session->task)) {
		module_put(THIS_MODULE);
		err = PTR_ERR(session->task);
		goto unlink;
	}

	if (!(session->flags & (1 << CMTP_LOOPBACK))) {
		err = cmtp_attach_device(session);
		if (err < 0) {
			atomic_inc(&session->terminate);
			wake_up_process(session->task);
			up_write(&cmtp_session_sem);
			return err;
		}
	}

	up_write(&cmtp_session_sem);
	return 0;

unlink:
	__cmtp_unlink_session(session);

failed:
	up_write(&cmtp_session_sem);
	kfree(session);
	return err;
}

int cmtp_del_connection(struct cmtp_conndel_req *req)
{
	struct cmtp_session *session;
	int err = 0;

	BT_DBG("");

	down_read(&cmtp_session_sem);

	session = __cmtp_get_session(&req->bdaddr);
	if (session) {
		/* Flush the transmit queue */
		skb_queue_purge(&session->transmit);

		/* Stop session thread */
		atomic_inc(&session->terminate);
		wake_up_process(session->task);
	} else
		err = -ENOENT;

	up_read(&cmtp_session_sem);
	return err;
}

int cmtp_get_connlist(struct cmtp_connlist_req *req)
{
	struct cmtp_session *session;
	int err = 0, n = 0;

	BT_DBG("");

	down_read(&cmtp_session_sem);

	list_for_each_entry(session, &cmtp_session_list, list) {
		struct cmtp_conninfo ci;

		__cmtp_copy_session(session, &ci);

		if (copy_to_user(req->ci, &ci, sizeof(ci))) {
			err = -EFAULT;
			break;
		}

		if (++n >= req->cnum)
			break;

		req->ci++;
	}
	req->cnum = n;

	up_read(&cmtp_session_sem);
	return err;
}

int cmtp_get_conninfo(struct cmtp_conninfo *ci)
{
	struct cmtp_session *session;
	int err = 0;

	down_read(&cmtp_session_sem);

	session = __cmtp_get_session(&ci->bdaddr);
	if (session)
		__cmtp_copy_session(session, ci);
	else
		err = -ENOENT;

	up_read(&cmtp_session_sem);
	return err;
}


static int __init cmtp_init(void)
{
	BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION);

	cmtp_init_sockets();

	return 0;
}

static void __exit cmtp_exit(void)
{
	cmtp_cleanup_sockets();
}

module_init(cmtp_init);
module_exit(cmtp_exit);

MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS("bt-proto-5");
Commit	Line	Data
8e87d142	1	/*
1da177e4 LT	2	CMTP implementation for Linux Bluetooth stack (BlueZ).
	3	Copyright (C) 2002-2003 Marcel Holtmann <marcel@holtmann.org>
	4
	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License version 2 as
	7	published by the Free Software Foundation;
	8
	9	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
	10	OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	11	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
	12	IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142 YH	13	CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
	14	WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	15	ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4 LT	16	OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1da177e4 LT	17
8e87d142 YH	18	ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
8e87d142 YH	19	COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4 LT	20	SOFTWARE IS DISCLAIMED.
	21	*/
	22
1da177e4 LT	23	#include <linux/module.h>
	24
	25	#include <linux/types.h>
	26	#include <linux/errno.h>
	27	#include <linux/kernel.h>
1da177e4 LT	28	#include <linux/sched.h>
	29	#include <linux/slab.h>
	30	#include <linux/poll.h>
	31	#include <linux/fcntl.h>
83144186	32	#include <linux/freezer.h>
1da177e4 LT	33	#include <linux/skbuff.h>
	34	#include <linux/socket.h>
	35	#include <linux/ioctl.h>
	36	#include <linux/file.h>
	37	#include <linux/init.h>
fada4ac3	38	#include <linux/kthread.h>
1da177e4 LT	39	#include <net/sock.h>
	40
	41	#include <linux/isdn/capilli.h>
	42
	43	#include <net/bluetooth/bluetooth.h>
	44	#include <net/bluetooth/l2cap.h>
	45
	46	#include "cmtp.h"
	47
1da177e4 LT	48	#define VERSION "1.0"
	49
	50	static DECLARE_RWSEM(cmtp_session_sem);
	51	static LIST_HEAD(cmtp_session_list);
	52
	53	static struct cmtp_session __cmtp_get_session(bdaddr_t bdaddr)
	54	{
	55	struct cmtp_session *session;
1da177e4 LT	56
	57	BT_DBG("");
	58
8035ded4	59	list_for_each_entry(session, &cmtp_session_list, list)
1da177e4 LT	60	if (!bacmp(bdaddr, &session->bdaddr))
1da177e4 LT	61	return session;
8035ded4	62
1da177e4 LT	63	return NULL;
	64	}
	65
	66	static void __cmtp_link_session(struct cmtp_session *session)
	67	{
1da177e4 LT	68	list_add(&session->list, &cmtp_session_list);
	69	}
	70
	71	static void __cmtp_unlink_session(struct cmtp_session *session)
	72	{
	73	list_del(&session->list);
1da177e4 LT	74	}
	75
	76	static void __cmtp_copy_session(struct cmtp_session session, struct cmtp_conninfo ci)
	77	{
3185fbd9	78	memset(ci, 0, sizeof(*ci));
1da177e4 LT	79	bacpy(&ci->bdaddr, &session->bdaddr);
	80
	81	ci->flags = session->flags;
	82	ci->state = session->state;
	83
	84	ci->num = session->num;
	85	}
	86
	87
	88	static inline int cmtp_alloc_block_id(struct cmtp_session *session)
	89	{
	90	int i, id = -1;
	91
	92	for (i = 0; i < 16; i++)
	93	if (!test_and_set_bit(i, &session->blockids)) {
	94	id = i;
	95	break;
	96	}
	97
	98	return id;
	99	}
	100
	101	static inline void cmtp_free_block_id(struct cmtp_session *session, int id)
	102	{
	103	clear_bit(id, &session->blockids);
	104	}
	105
	106	static inline void cmtp_add_msgpart(struct cmtp_session session, int id, const unsigned char buf, int count)
	107	{
	108	struct sk_buff skb = session->reassembly[id], nskb;
	109	int size;
	110
	111	BT_DBG("session %p buf %p count %d", session, buf, count);
	112
	113	size = (skb) ? skb->len + count : count;
	114
5a08ecce AE	115	nskb = alloc_skb(size, GFP_ATOMIC);
5a08ecce AE	116	if (!nskb) {
1da177e4 LT	117	BT_ERR("Can't allocate memory for CAPI message");
	118	return;
	119	}
	120
	121	if (skb && (skb->len > 0))
d626f62b	122	skb_copy_from_linear_data(skb, skb_put(nskb, skb->len), skb->len);
1da177e4 LT	123
	124	memcpy(skb_put(nskb, count), buf, count);
	125
	126	session->reassembly[id] = nskb;
	127
7585b97a	128	kfree_skb(skb);
1da177e4 LT	129	}
	130
	131	static inline int cmtp_recv_frame(struct cmtp_session session, struct sk_buff skb)
	132	{
	133	__u8 hdr, hdrlen, id;
	134	__u16 len;
	135
	136	BT_DBG("session %p skb %p len %d", session, skb, skb->len);
	137
	138	while (skb->len > 0) {
	139	hdr = skb->data[0];
	140
	141	switch (hdr & 0xc0) {
	142	case 0x40:
	143	hdrlen = 2;
	144	len = skb->data[1];
	145	break;
	146	case 0x80:
	147	hdrlen = 3;
	148	len = skb->data[1] \| (skb->data[2] << 8);
	149	break;
	150	default:
	151	hdrlen = 1;
	152	len = 0;
	153	break;
	154	}
	155
	156	id = (hdr & 0x3c) >> 2;
	157
	158	BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id);
	159
	160	if (hdrlen + len > skb->len) {
	161	BT_ERR("Wrong size or header information in CMTP frame");
	162	break;
	163	}
	164
	165	if (len == 0) {
	166	skb_pull(skb, hdrlen);
	167	continue;
	168	}
	169
	170	switch (hdr & 0x03) {
	171	case 0x00:
	172	cmtp_add_msgpart(session, id, skb->data + hdrlen, len);
	173	cmtp_recv_capimsg(session, session->reassembly[id]);
	174	session->reassembly[id] = NULL;
	175	break;
	176	case 0x01:
	177	cmtp_add_msgpart(session, id, skb->data + hdrlen, len);
	178	break;
	179	default:
	180	if (session->reassembly[id] != NULL)
	181	kfree_skb(session->reassembly[id]);
	182	session->reassembly[id] = NULL;
	183	break;
	184	}
	185
	186	skb_pull(skb, hdrlen + len);
	187	}
	188
	189	kfree_skb(skb);
	190	return 0;
	191	}
	192
193	static int cmtp_send_frame(struct cmtp_session session, unsigned char data, int len)
194	{
195	struct socket *sock = session->sock;
196	struct kvec iv = { data, len };
197	struct msghdr msg;
198
199	BT_DBG("session %p data %p len %d", session, data, len);
200
201	if (!len)
202	return 0;
203
204	memset(&msg, 0, sizeof(msg));
205
206	return kernel_sendmsg(sock, &msg, &iv, 1, len);
207	}
208
b03efcfb	209	static void cmtp_process_transmit(struct cmtp_session *session)
1da177e4 LT	210	{
	211	struct sk_buff skb, nskb;
	212	unsigned char *hdr;
	213	unsigned int size, tail;
	214
	215	BT_DBG("session %p", session);
	216
5a08ecce AE	217	nskb = alloc_skb(session->mtu, GFP_ATOMIC);
5a08ecce AE	218	if (!nskb) {
1da177e4	219	BT_ERR("Can't allocate memory for new frame");
b03efcfb	220	return;
1da177e4 LT	221	}
	222
	223	while ((skb = skb_dequeue(&session->transmit))) {
	224	struct cmtp_scb scb = (void ) skb->cb;
	225
5a08ecce AE	226	tail = session->mtu - nskb->len;
5a08ecce AE	227	if (tail < 5) {
1da177e4 LT	228	cmtp_send_frame(session, nskb->data, nskb->len);
	229	skb_trim(nskb, 0);
	230	tail = session->mtu;
	231	}
	232
	233	size = min_t(uint, ((tail < 258) ? (tail - 2) : (tail - 3)), skb->len);
	234
58aac468 SJ	235	if (scb->id < 0) {
	236	scb->id = cmtp_alloc_block_id(session);
	237	if (scb->id < 0) {
	238	skb_queue_head(&session->transmit, skb);
	239	break;
	240	}
1da177e4 LT	241	}
	242
	243	if (size < 256) {
	244	hdr = skb_put(nskb, 2);
	245	hdr[0] = 0x40
	246	\| ((scb->id << 2) & 0x3c)
	247	\| ((skb->len == size) ? 0x00 : 0x01);
	248	hdr[1] = size;
	249	} else {
	250	hdr = skb_put(nskb, 3);
	251	hdr[0] = 0x80
	252	\| ((scb->id << 2) & 0x3c)
	253	\| ((skb->len == size) ? 0x00 : 0x01);
	254	hdr[1] = size & 0xff;
	255	hdr[2] = size >> 8;
	256	}
	257
d626f62b	258	skb_copy_from_linear_data(skb, skb_put(nskb, size), size);
1da177e4 LT	259	skb_pull(skb, size);
	260
	261	if (skb->len > 0) {
	262	skb_queue_head(&session->transmit, skb);
	263	} else {
	264	cmtp_free_block_id(session, scb->id);
	265	if (scb->data) {
	266	cmtp_send_frame(session, nskb->data, nskb->len);
	267	skb_trim(nskb, 0);
	268	}
	269	kfree_skb(skb);
	270	}
	271	}
	272
	273	cmtp_send_frame(session, nskb->data, nskb->len);
	274
	275	kfree_skb(nskb);
1da177e4 LT	276	}
	277
	278	static int cmtp_session(void *arg)
	279	{
	280	struct cmtp_session *session = arg;
	281	struct sock *sk = session->sock->sk;
	282	struct sk_buff *skb;
	283	wait_queue_t wait;
	284
	285	BT_DBG("session %p", session);
	286
1da177e4	287	set_user_nice(current, -15);
1da177e4 LT	288
1da177e4 LT	289	init_waitqueue_entry(&wait, current);
aa395145	290	add_wait_queue(sk_sleep(sk), &wait);
3a3f5c7d	291	while (1) {
1da177e4 LT	292	set_current_state(TASK_INTERRUPTIBLE);
1da177e4 LT	293
7176522c	294	if (atomic_read(&session->terminate))
3a3f5c7d	295	break;
1da177e4 LT	296	if (sk->sk_state != BT_CONNECTED)
	297	break;
	298
	299	while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
	300	skb_orphan(skb);
44935720 MM	301	if (!skb_linearize(skb))
	302	cmtp_recv_frame(session, skb);
	303	else
	304	kfree_skb(skb);
1da177e4 LT	305	}
	306
	307	cmtp_process_transmit(session);
	308
	309	schedule();
	310	}
3a3f5c7d	311	__set_current_state(TASK_RUNNING);
aa395145	312	remove_wait_queue(sk_sleep(sk), &wait);
1da177e4 LT	313
	314	down_write(&cmtp_session_sem);
	315
	316	if (!(session->flags & (1 << CMTP_LOOPBACK)))
	317	cmtp_detach_device(session);
	318
	319	fput(session->sock->file);
	320
	321	__cmtp_unlink_session(session);
	322
	323	up_write(&cmtp_session_sem);
	324
	325	kfree(session);
48b28b8d	326	module_put_and_exit(0);
1da177e4 LT	327	return 0;
	328	}
	329
	330	int cmtp_add_connection(struct cmtp_connadd_req req, struct socket sock)
	331	{
	332	struct cmtp_session session, s;
1da177e4 LT	333	int i, err;
	334
	335	BT_DBG("");
	336
ecce864b AV	337	if (!l2cap_is_socket(sock))
	338	return -EBADFD;
	339
25ea6db0	340	session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL);
8e87d142	341	if (!session)
1da177e4	342	return -ENOMEM;
1da177e4 LT	343
	344	down_write(&cmtp_session_sem);
	345
	346	s = __cmtp_get_session(&bt_sk(sock->sk)->dst);
	347	if (s && s->state == BT_CONNECTED) {
	348	err = -EEXIST;
	349	goto failed;
	350	}
	351
	352	bacpy(&session->bdaddr, &bt_sk(sock->sk)->dst);
	353
0c1bc5c6 GP	354	session->mtu = min_t(uint, l2cap_pi(sock->sk)->chan->omtu,
0c1bc5c6 GP	355	l2cap_pi(sock->sk)->chan->imtu);
1da177e4 LT	356
	357	BT_DBG("mtu %d", session->mtu);
	358
fcb73338	359	sprintf(session->name, "%pMR", &bt_sk(sock->sk)->dst);
1da177e4 LT	360
	361	session->sock = sock;
	362	session->state = BT_CONFIG;
	363
	364	init_waitqueue_head(&session->wait);
	365
	366	session->msgnum = CMTP_INITIAL_MSGNUM;
	367
	368	INIT_LIST_HEAD(&session->applications);
	369
	370	skb_queue_head_init(&session->transmit);
	371
	372	for (i = 0; i < 16; i++)
	373	session->reassembly[i] = NULL;
	374
	375	session->flags = req->flags;
	376
	377	__cmtp_link_session(session);
	378
48b28b8d	379	__module_get(THIS_MODULE);
fada4ac3 SJ	380	session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d",
	381	session->num);
	382	if (IS_ERR(session->task)) {
48b28b8d	383	module_put(THIS_MODULE);
fada4ac3	384	err = PTR_ERR(session->task);
1da177e4	385	goto unlink;
fada4ac3	386	}
1da177e4 LT	387
	388	if (!(session->flags & (1 << CMTP_LOOPBACK))) {
	389	err = cmtp_attach_device(session);
687beaa0 PH	390	if (err < 0) {
	391	atomic_inc(&session->terminate);
	392	wake_up_process(session->task);
	393	up_write(&cmtp_session_sem);
	394	return err;
	395	}
1da177e4 LT	396	}
	397
	398	up_write(&cmtp_session_sem);
	399	return 0;
	400
1da177e4 LT	401	unlink:
	402	__cmtp_unlink_session(session);
	403
	404	failed:
	405	up_write(&cmtp_session_sem);
	406	kfree(session);
	407	return err;
	408	}
	409
	410	int cmtp_del_connection(struct cmtp_conndel_req *req)
	411	{
	412	struct cmtp_session *session;
	413	int err = 0;
	414
	415	BT_DBG("");
	416
	417	down_read(&cmtp_session_sem);
	418
	419	session = __cmtp_get_session(&req->bdaddr);
	420	if (session) {
	421	/* Flush the transmit queue */
	422	skb_queue_purge(&session->transmit);
	423
fada4ac3	424	/* Stop session thread */
7176522c PH	425	atomic_inc(&session->terminate);
7176522c PH	426	wake_up_process(session->task);
1da177e4 LT	427	} else
	428	err = -ENOENT;
	429
	430	up_read(&cmtp_session_sem);
	431	return err;
	432	}
	433
	434	int cmtp_get_connlist(struct cmtp_connlist_req *req)
	435	{
8035ded4	436	struct cmtp_session *session;
1da177e4 LT	437	int err = 0, n = 0;
	438
	439	BT_DBG("");
	440
	441	down_read(&cmtp_session_sem);
	442
8035ded4	443	list_for_each_entry(session, &cmtp_session_list, list) {
1da177e4 LT	444	struct cmtp_conninfo ci;
1da177e4 LT	445
1da177e4 LT	446	__cmtp_copy_session(session, &ci);
	447
	448	if (copy_to_user(req->ci, &ci, sizeof(ci))) {
	449	err = -EFAULT;
	450	break;
	451	}
	452
	453	if (++n >= req->cnum)
	454	break;
	455
	456	req->ci++;
	457	}
	458	req->cnum = n;
	459
	460	up_read(&cmtp_session_sem);
	461	return err;
	462	}
	463
	464	int cmtp_get_conninfo(struct cmtp_conninfo *ci)
	465	{
	466	struct cmtp_session *session;
	467	int err = 0;
	468
	469	down_read(&cmtp_session_sem);
	470
	471	session = __cmtp_get_session(&ci->bdaddr);
	472	if (session)
	473	__cmtp_copy_session(session, ci);
	474	else
	475	err = -ENOENT;
	476
	477	up_read(&cmtp_session_sem);
	478	return err;
	479	}
	480
	481
	482	static int __init cmtp_init(void)
	483	{
1da177e4 LT	484	BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION);
	485
	486	cmtp_init_sockets();
	487
	488	return 0;
	489	}
	490
	491	static void __exit cmtp_exit(void)
	492	{
	493	cmtp_cleanup_sockets();
	494	}
	495
	496	module_init(cmtp_init);
	497	module_exit(cmtp_exit);
	498
	499	MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
	500	MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION);
	501	MODULE_VERSION(VERSION);
	502	MODULE_LICENSE("GPL");
	503	MODULE_ALIAS("bt-proto-5");