Release 4.8 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;
}

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marcel holtmann
marcel holtmann
46
93.88%
1
50.00%
luiz augusto von dentz
luiz augusto von dentz
3
6.12%
1
50.00%
Total
49
100.00%
2
100.00%



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

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marcel holtmann
marcel holtmann
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1
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22
100.00%
1
100.00%



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

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marcel holtmann
marcel holtmann
19
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1
100.00%
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19
100.00%
1
100.00%



static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci)
{
	u32 valid_flags = BIT(CMTP_LOOPBACK);
	memset(ci, 0, sizeof(*ci));
	bacpy(&ci->bdaddr, &session->bdaddr);

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

	ci->num = session->num;
}


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marcel holtmann
marcel holtmann
63
82.89%
2
66.67%
vasiliy kulikov
vasiliy kulikov
13
17.11%
1
33.33%
Total
76
100.00%
3
100.00%



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;
}

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marcel holtmann
marcel holtmann
56
100.00%
1
100.00%
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56
100.00%
1
100.00%



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

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marcel holtmann
marcel holtmann
25
100.00%
1
100.00%
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25
100.00%
1
100.00%



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);
}

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marcel holtmann
marcel holtmann
139
94.56%
1
33.33%
andrei emeltchenko
andrei emeltchenko
5
3.40%
1
33.33%
arnaldo carvalho de melo
arnaldo carvalho de melo
3
2.04%
1
33.33%
Total
147
100.00%
3
100.00%



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:
			kfree_skb(session->reassembly[id]);
			session->reassembly[id] = NULL;
			break;
		}

		skb_pull(skb, hdrlen + len);
	}

	kfree_skb(skb);
	return 0;
}

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marcel holtmann
marcel holtmann
284
100.00%
1
100.00%
Total
284
100.00%
1
100.00%



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);
}

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marcel holtmann
marcel holtmann
83
92.22%
1
50.00%
al viro
al viro
7
7.78%
1
50.00%
Total
90
100.00%
2
100.00%



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);
}

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marcel holtmann
marcel holtmann
406
94.64%
1
20.00%
andrei emeltchenko
andrei emeltchenko
9
2.10%
1
20.00%
szymon janc
szymon janc
9
2.10%
1
20.00%
arnaldo carvalho de melo
arnaldo carvalho de melo
3
0.70%
1
20.00%
david s. miller
david s. miller
2
0.47%
1
20.00%
Total
429
100.00%
5
100.00%



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 & BIT(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;
}

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marcel holtmann
marcel holtmann
187
83.11%
2
28.57%
mat martineau
mat martineau
14
6.22%
1
14.29%
peter hurley
peter hurley
13
5.78%
2
28.57%
eric dumazet
eric dumazet
6
2.67%
1
14.29%
david herrmann
david herrmann
5
2.22%
1
14.29%
Total
225
100.00%
7
100.00%



int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock)
{
	u32 valid_flags = BIT(CMTP_LOOPBACK);
	struct cmtp_session *session, *s;
	int i, err;

	BT_DBG("");

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

	if (req->flags & ~valid_flags)
		return -EINVAL;

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

	down_write(&cmtp_session_sem);

	s = __cmtp_get_session(&l2cap_pi(sock->sk)->chan->dst);
	if (s && s->state == BT_CONNECTED) {
		err = -EEXIST;
		goto failed;
	}

	bacpy(&session->bdaddr, &l2cap_pi(sock->sk)->chan->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", &session->bdaddr);

	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 & BIT(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;
}

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marcel holtmann
marcel holtmann
340
81.15%
5
41.67%
szymon janc
szymon janc
26
6.21%
1
8.33%
peter hurley
peter hurley
25
5.97%
1
8.33%
al viro
al viro
12
2.86%
1
8.33%
david herrmann
david herrmann
10
2.39%
1
8.33%
gustavo f. padovan
gustavo f. padovan
5
1.19%
2
16.67%
andrei emeltchenko
andrei emeltchenko
1
0.24%
1
8.33%
Total
419
100.00%
12
100.00%



int cmtp_del_connection(struct cmtp_conndel_req *req)
{
	u32 valid_flags = 0;
	struct cmtp_session *session;
	int err = 0;

	BT_DBG("");

	if (req->flags & ~valid_flags)
		return -EINVAL;

	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;
}

Contributors
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marcel holtmann
marcel holtmann
94
89.52%
2
50.00%
peter hurley
peter hurley
9
8.57%
1
25.00%
szymon janc
szymon janc
2
1.90%
1
25.00%
Total
105
100.00%
4
100.00%



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;
}

Contributors
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marcel holtmann
marcel holtmann
106
94.64%
1
50.00%
luiz augusto von dentz
luiz augusto von dentz
6
5.36%
1
50.00%
Total
112
100.00%
2
100.00%



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;
}


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marcel holtmann
marcel holtmann
62
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1
100.00%
Total
62
100.00%
1
100.00%



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

	cmtp_init_sockets();

	return 0;
}

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marcel holtmann
marcel holtmann
22
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2
100.00%
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22
100.00%
2
100.00%



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

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marcel holtmann
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12
100.00%
2
100.00%


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");
Overall Contributors
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marcel holtmann
marcel holtmann
2072
91.40%
7
25.93%
peter hurley
peter hurley
47
2.07%
3
11.11%
szymon janc
szymon janc
40
1.76%
2
7.41%
al viro
al viro
19
0.84%
2
7.41%
andrei emeltchenko
andrei emeltchenko
15
0.66%
2
7.41%
david herrmann
david herrmann
15
0.66%
1
3.70%
mat martineau
mat martineau
14
0.62%
1
3.70%
vasiliy kulikov
vasiliy kulikov
13
0.57%
1
3.70%
luiz augusto von dentz
luiz augusto von dentz
9
0.40%
1
3.70%
arnaldo carvalho de melo
arnaldo carvalho de melo
6
0.26%
1
3.70%
eric dumazet
eric dumazet
6
0.26%
1
3.70%
gustavo f. padovan
gustavo f. padovan
5
0.22%
2
7.41%
rafael j. wysocki
rafael j. wysocki
3
0.13%
1
3.70%
david s. miller
david s. miller
2
0.09%
1
3.70%
hideaki yoshifuji
hideaki yoshifuji
1
0.04%
1
3.70%
Total
2267
100.00%
27
100.00%
  
Directory: net/bluetooth/cmtp

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