1 files changed, 517 insertions, 0 deletions

diff --git a/net/bluetooth/cmtp/core.c b/net/bluetooth/cmtp/core.c
new file mode 100644
index 000000000..4764ed73f
--- /dev/null
+++ b/net/bluetooth/cmtp/core.c
@@ -0,0 +1,517 @@
+/*
+   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)
+{
+	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;
+}
+
+
+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);
+
+	skb_put_data(nskb, 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:
+			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;
+	DEFINE_WAIT_FUNC(wait, woken_wake_function);
+
+	BT_DBG("session %p", session);
+
+	set_user_nice(current, -15);
+
+	add_wait_queue(sk_sleep(sk), &wait);
+	while (1) {
+		/* Ensure session->terminate is updated */
+		smp_mb__before_atomic();
+
+		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);
+
+		wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
+	}
+	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;
+}
+
+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) {
+			/* Caller will call fput in case of failure, and so
+			 * will cmtp_session kthread.
+			 */
+			get_file(session->sock->file);
+
+			atomic_inc(&session->terminate);
+			wake_up_interruptible(sk_sleep(session->sock->sk));
+			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)
+{
+	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);
+
+		/* Ensure session->terminate is updated */
+		smp_mb__after_atomic();
+
+		wake_up_interruptible(sk_sleep(session->sock->sk));
+	} 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);
+
+	return cmtp_init_sockets();
+}
+
+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");