[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("");

	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
25ea6db0	337	session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL);
8e87d142	338	if (!session)
1da177e4	339	return -ENOMEM;
1da177e4 LT	340
	341	down_write(&cmtp_session_sem);
	342
	343	s = __cmtp_get_session(&bt_sk(sock->sk)->dst);
	344	if (s && s->state == BT_CONNECTED) {
	345	err = -EEXIST;
	346	goto failed;
	347	}
	348
	349	bacpy(&session->bdaddr, &bt_sk(sock->sk)->dst);
	350
0c1bc5c6 GP	351	session->mtu = min_t(uint, l2cap_pi(sock->sk)->chan->omtu,
0c1bc5c6 GP	352	l2cap_pi(sock->sk)->chan->imtu);
1da177e4 LT	353
	354	BT_DBG("mtu %d", session->mtu);
	355
fcb73338	356	sprintf(session->name, "%pMR", &bt_sk(sock->sk)->dst);
1da177e4 LT	357
	358	session->sock = sock;
	359	session->state = BT_CONFIG;
	360
	361	init_waitqueue_head(&session->wait);
	362
	363	session->msgnum = CMTP_INITIAL_MSGNUM;
	364
	365	INIT_LIST_HEAD(&session->applications);
	366
	367	skb_queue_head_init(&session->transmit);
	368
	369	for (i = 0; i < 16; i++)
	370	session->reassembly[i] = NULL;
	371
	372	session->flags = req->flags;
	373
	374	__cmtp_link_session(session);
	375
48b28b8d	376	__module_get(THIS_MODULE);
fada4ac3 SJ	377	session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d",
	378	session->num);
	379	if (IS_ERR(session->task)) {
48b28b8d	380	module_put(THIS_MODULE);
fada4ac3	381	err = PTR_ERR(session->task);
1da177e4	382	goto unlink;
fada4ac3	383	}
1da177e4 LT	384
	385	if (!(session->flags & (1 << CMTP_LOOPBACK))) {
	386	err = cmtp_attach_device(session);
687beaa0 PH	387	if (err < 0) {
	388	atomic_inc(&session->terminate);
	389	wake_up_process(session->task);
	390	up_write(&cmtp_session_sem);
	391	return err;
	392	}
1da177e4 LT	393	}
	394
	395	up_write(&cmtp_session_sem);
	396	return 0;
	397
1da177e4 LT	398	unlink:
	399	__cmtp_unlink_session(session);
	400
	401	failed:
	402	up_write(&cmtp_session_sem);
	403	kfree(session);
	404	return err;
	405	}
	406
	407	int cmtp_del_connection(struct cmtp_conndel_req *req)
	408	{
	409	struct cmtp_session *session;
	410	int err = 0;
	411
	412	BT_DBG("");
	413
	414	down_read(&cmtp_session_sem);
	415
	416	session = __cmtp_get_session(&req->bdaddr);
	417	if (session) {
	418	/* Flush the transmit queue */
	419	skb_queue_purge(&session->transmit);
	420
fada4ac3	421	/* Stop session thread */
7176522c PH	422	atomic_inc(&session->terminate);
7176522c PH	423	wake_up_process(session->task);
1da177e4 LT	424	} else
	425	err = -ENOENT;
	426
	427	up_read(&cmtp_session_sem);
	428	return err;
	429	}
	430
	431	int cmtp_get_connlist(struct cmtp_connlist_req *req)
	432	{
8035ded4	433	struct cmtp_session *session;
1da177e4 LT	434	int err = 0, n = 0;
	435
	436	BT_DBG("");
	437
	438	down_read(&cmtp_session_sem);
	439
8035ded4	440	list_for_each_entry(session, &cmtp_session_list, list) {
1da177e4 LT	441	struct cmtp_conninfo ci;
1da177e4 LT	442
1da177e4 LT	443	__cmtp_copy_session(session, &ci);
	444
	445	if (copy_to_user(req->ci, &ci, sizeof(ci))) {
	446	err = -EFAULT;
	447	break;
	448	}
	449
	450	if (++n >= req->cnum)
	451	break;
	452
	453	req->ci++;
	454	}
	455	req->cnum = n;
	456
	457	up_read(&cmtp_session_sem);
	458	return err;
	459	}
	460
	461	int cmtp_get_conninfo(struct cmtp_conninfo *ci)
	462	{
	463	struct cmtp_session *session;
	464	int err = 0;
	465
	466	down_read(&cmtp_session_sem);
	467
	468	session = __cmtp_get_session(&ci->bdaddr);
	469	if (session)
	470	__cmtp_copy_session(session, ci);
	471	else
	472	err = -ENOENT;
	473
	474	up_read(&cmtp_session_sem);
	475	return err;
	476	}
	477
	478
	479	static int __init cmtp_init(void)
	480	{
1da177e4 LT	481	BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION);
	482
	483	cmtp_init_sockets();
	484
	485	return 0;
	486	}
	487
	488	static void __exit cmtp_exit(void)
	489	{
	490	cmtp_cleanup_sockets();
	491	}
	492
	493	module_init(cmtp_init);
	494	module_exit(cmtp_exit);
	495
	496	MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
	497	MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION);
	498	MODULE_VERSION(VERSION);
	499	MODULE_LICENSE("GPL");
	500	MODULE_ALIAS("bt-proto-5");