![YOSHIFUJI Hideaki](/assets/img/avatar_default.png)
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
578 lines
13 KiB
C
578 lines
13 KiB
C
/*
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BlueZ - Bluetooth protocol stack for Linux
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Copyright (C) 2000-2001 Qualcomm Incorporated
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Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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/* Bluetooth HCI connection handling. */
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/interrupt.h>
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#include <linux/notifier.h>
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#include <net/sock.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/unaligned.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#ifndef CONFIG_BT_HCI_CORE_DEBUG
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#undef BT_DBG
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#define BT_DBG(D...)
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#endif
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void hci_acl_connect(struct hci_conn *conn)
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{
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struct hci_dev *hdev = conn->hdev;
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struct inquiry_entry *ie;
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struct hci_cp_create_conn cp;
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BT_DBG("%p", conn);
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conn->state = BT_CONNECT;
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conn->out = 1;
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conn->link_mode = HCI_LM_MASTER;
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conn->attempt++;
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memset(&cp, 0, sizeof(cp));
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bacpy(&cp.bdaddr, &conn->dst);
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cp.pscan_rep_mode = 0x02;
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if ((ie = hci_inquiry_cache_lookup(hdev, &conn->dst)) &&
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inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
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cp.pscan_rep_mode = ie->data.pscan_rep_mode;
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cp.pscan_mode = ie->data.pscan_mode;
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cp.clock_offset = ie->data.clock_offset | cpu_to_le16(0x8000);
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memcpy(conn->dev_class, ie->data.dev_class, 3);
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}
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cp.pkt_type = cpu_to_le16(hdev->pkt_type & ACL_PTYPE_MASK);
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if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
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cp.role_switch = 0x01;
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else
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cp.role_switch = 0x00;
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hci_send_cmd(hdev, OGF_LINK_CTL, OCF_CREATE_CONN, sizeof(cp), &cp);
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}
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static void hci_acl_connect_cancel(struct hci_conn *conn)
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{
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struct hci_cp_create_conn_cancel cp;
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BT_DBG("%p", conn);
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if (conn->hdev->hci_ver < 2)
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return;
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bacpy(&cp.bdaddr, &conn->dst);
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hci_send_cmd(conn->hdev, OGF_LINK_CTL,
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OCF_CREATE_CONN_CANCEL, sizeof(cp), &cp);
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}
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void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
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{
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struct hci_cp_disconnect cp;
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BT_DBG("%p", conn);
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conn->state = BT_DISCONN;
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cp.handle = cpu_to_le16(conn->handle);
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cp.reason = reason;
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hci_send_cmd(conn->hdev, OGF_LINK_CTL,
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OCF_DISCONNECT, sizeof(cp), &cp);
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}
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void hci_add_sco(struct hci_conn *conn, __u16 handle)
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{
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struct hci_dev *hdev = conn->hdev;
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struct hci_cp_add_sco cp;
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BT_DBG("%p", conn);
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conn->state = BT_CONNECT;
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conn->out = 1;
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cp.pkt_type = cpu_to_le16(hdev->pkt_type & SCO_PTYPE_MASK);
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cp.handle = cpu_to_le16(handle);
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hci_send_cmd(hdev, OGF_LINK_CTL, OCF_ADD_SCO, sizeof(cp), &cp);
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}
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static void hci_conn_timeout(unsigned long arg)
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{
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struct hci_conn *conn = (void *) arg;
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struct hci_dev *hdev = conn->hdev;
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BT_DBG("conn %p state %d", conn, conn->state);
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if (atomic_read(&conn->refcnt))
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return;
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hci_dev_lock(hdev);
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switch (conn->state) {
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case BT_CONNECT:
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hci_acl_connect_cancel(conn);
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break;
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case BT_CONNECTED:
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hci_acl_disconn(conn, 0x13);
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break;
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default:
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conn->state = BT_CLOSED;
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break;
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}
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hci_dev_unlock(hdev);
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}
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static void hci_conn_idle(unsigned long arg)
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{
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struct hci_conn *conn = (void *) arg;
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BT_DBG("conn %p mode %d", conn, conn->mode);
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hci_conn_enter_sniff_mode(conn);
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}
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struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
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{
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struct hci_conn *conn;
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BT_DBG("%s dst %s", hdev->name, batostr(dst));
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conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
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if (!conn)
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return NULL;
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bacpy(&conn->dst, dst);
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conn->hdev = hdev;
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conn->type = type;
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conn->mode = HCI_CM_ACTIVE;
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conn->state = BT_OPEN;
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conn->power_save = 1;
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skb_queue_head_init(&conn->data_q);
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init_timer(&conn->disc_timer);
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conn->disc_timer.function = hci_conn_timeout;
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conn->disc_timer.data = (unsigned long) conn;
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init_timer(&conn->idle_timer);
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conn->idle_timer.function = hci_conn_idle;
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conn->idle_timer.data = (unsigned long) conn;
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atomic_set(&conn->refcnt, 0);
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hci_dev_hold(hdev);
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tasklet_disable(&hdev->tx_task);
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hci_conn_hash_add(hdev, conn);
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if (hdev->notify)
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hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
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hci_conn_add_sysfs(conn);
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tasklet_enable(&hdev->tx_task);
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return conn;
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}
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int hci_conn_del(struct hci_conn *conn)
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{
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struct hci_dev *hdev = conn->hdev;
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BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
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del_timer(&conn->idle_timer);
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del_timer(&conn->disc_timer);
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if (conn->type == SCO_LINK) {
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struct hci_conn *acl = conn->link;
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if (acl) {
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acl->link = NULL;
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hci_conn_put(acl);
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}
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} else {
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struct hci_conn *sco = conn->link;
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if (sco)
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sco->link = NULL;
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/* Unacked frames */
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hdev->acl_cnt += conn->sent;
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}
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tasklet_disable(&hdev->tx_task);
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hci_conn_del_sysfs(conn);
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hci_conn_hash_del(hdev, conn);
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if (hdev->notify)
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hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
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tasklet_enable(&hdev->tx_task);
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skb_queue_purge(&conn->data_q);
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hci_dev_put(hdev);
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/* will free via device release */
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put_device(&conn->dev);
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return 0;
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}
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struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
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{
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int use_src = bacmp(src, BDADDR_ANY);
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struct hci_dev *hdev = NULL;
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struct list_head *p;
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BT_DBG("%s -> %s", batostr(src), batostr(dst));
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read_lock_bh(&hci_dev_list_lock);
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list_for_each(p, &hci_dev_list) {
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struct hci_dev *d = list_entry(p, struct hci_dev, list);
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if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
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continue;
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/* Simple routing:
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* No source address - find interface with bdaddr != dst
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* Source address - find interface with bdaddr == src
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*/
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if (use_src) {
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if (!bacmp(&d->bdaddr, src)) {
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hdev = d; break;
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}
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} else {
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if (bacmp(&d->bdaddr, dst)) {
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hdev = d; break;
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}
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}
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}
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if (hdev)
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hdev = hci_dev_hold(hdev);
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read_unlock_bh(&hci_dev_list_lock);
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return hdev;
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}
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EXPORT_SYMBOL(hci_get_route);
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/* Create SCO or ACL connection.
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* Device _must_ be locked */
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struct hci_conn * hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst)
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{
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struct hci_conn *acl;
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BT_DBG("%s dst %s", hdev->name, batostr(dst));
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if (!(acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst))) {
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if (!(acl = hci_conn_add(hdev, ACL_LINK, dst)))
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return NULL;
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}
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hci_conn_hold(acl);
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if (acl->state == BT_OPEN || acl->state == BT_CLOSED)
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hci_acl_connect(acl);
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if (type == SCO_LINK) {
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struct hci_conn *sco;
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if (!(sco = hci_conn_hash_lookup_ba(hdev, SCO_LINK, dst))) {
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if (!(sco = hci_conn_add(hdev, SCO_LINK, dst))) {
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hci_conn_put(acl);
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return NULL;
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}
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}
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acl->link = sco;
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sco->link = acl;
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hci_conn_hold(sco);
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if (acl->state == BT_CONNECTED &&
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(sco->state == BT_OPEN || sco->state == BT_CLOSED))
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hci_add_sco(sco, acl->handle);
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return sco;
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} else {
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return acl;
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}
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}
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EXPORT_SYMBOL(hci_connect);
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/* Authenticate remote device */
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int hci_conn_auth(struct hci_conn *conn)
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{
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BT_DBG("conn %p", conn);
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if (conn->link_mode & HCI_LM_AUTH)
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return 1;
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if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
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struct hci_cp_auth_requested cp;
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cp.handle = cpu_to_le16(conn->handle);
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hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_AUTH_REQUESTED, sizeof(cp), &cp);
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}
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return 0;
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}
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EXPORT_SYMBOL(hci_conn_auth);
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/* Enable encryption */
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int hci_conn_encrypt(struct hci_conn *conn)
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{
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BT_DBG("conn %p", conn);
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if (conn->link_mode & HCI_LM_ENCRYPT)
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return 1;
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if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
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return 0;
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if (hci_conn_auth(conn)) {
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struct hci_cp_set_conn_encrypt cp;
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cp.handle = cpu_to_le16(conn->handle);
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cp.encrypt = 1;
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hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_SET_CONN_ENCRYPT, sizeof(cp), &cp);
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}
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return 0;
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}
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EXPORT_SYMBOL(hci_conn_encrypt);
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/* Change link key */
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int hci_conn_change_link_key(struct hci_conn *conn)
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{
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BT_DBG("conn %p", conn);
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if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
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struct hci_cp_change_conn_link_key cp;
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cp.handle = cpu_to_le16(conn->handle);
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hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_CHANGE_CONN_LINK_KEY, sizeof(cp), &cp);
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}
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return 0;
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}
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EXPORT_SYMBOL(hci_conn_change_link_key);
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/* Switch role */
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int hci_conn_switch_role(struct hci_conn *conn, uint8_t role)
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{
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BT_DBG("conn %p", conn);
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if (!role && conn->link_mode & HCI_LM_MASTER)
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return 1;
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if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
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struct hci_cp_switch_role cp;
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bacpy(&cp.bdaddr, &conn->dst);
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cp.role = role;
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hci_send_cmd(conn->hdev, OGF_LINK_POLICY, OCF_SWITCH_ROLE, sizeof(cp), &cp);
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}
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return 0;
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}
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EXPORT_SYMBOL(hci_conn_switch_role);
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/* Enter active mode */
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void hci_conn_enter_active_mode(struct hci_conn *conn)
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{
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struct hci_dev *hdev = conn->hdev;
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BT_DBG("conn %p mode %d", conn, conn->mode);
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if (test_bit(HCI_RAW, &hdev->flags))
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return;
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if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
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goto timer;
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if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
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struct hci_cp_exit_sniff_mode cp;
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cp.handle = cpu_to_le16(conn->handle);
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hci_send_cmd(hdev, OGF_LINK_POLICY,
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OCF_EXIT_SNIFF_MODE, sizeof(cp), &cp);
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}
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timer:
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if (hdev->idle_timeout > 0)
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mod_timer(&conn->idle_timer,
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jiffies + msecs_to_jiffies(hdev->idle_timeout));
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}
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/* Enter sniff mode */
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void hci_conn_enter_sniff_mode(struct hci_conn *conn)
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{
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struct hci_dev *hdev = conn->hdev;
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BT_DBG("conn %p mode %d", conn, conn->mode);
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if (test_bit(HCI_RAW, &hdev->flags))
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return;
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if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
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return;
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if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
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return;
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if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
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struct hci_cp_sniff_subrate cp;
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cp.handle = cpu_to_le16(conn->handle);
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cp.max_latency = cpu_to_le16(0);
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cp.min_remote_timeout = cpu_to_le16(0);
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cp.min_local_timeout = cpu_to_le16(0);
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hci_send_cmd(hdev, OGF_LINK_POLICY,
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OCF_SNIFF_SUBRATE, sizeof(cp), &cp);
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}
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if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
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struct hci_cp_sniff_mode cp;
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cp.handle = cpu_to_le16(conn->handle);
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cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
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cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
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cp.attempt = cpu_to_le16(4);
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cp.timeout = cpu_to_le16(1);
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hci_send_cmd(hdev, OGF_LINK_POLICY,
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OCF_SNIFF_MODE, sizeof(cp), &cp);
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}
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}
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/* Drop all connection on the device */
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void hci_conn_hash_flush(struct hci_dev *hdev)
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{
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struct hci_conn_hash *h = &hdev->conn_hash;
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struct list_head *p;
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BT_DBG("hdev %s", hdev->name);
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p = h->list.next;
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while (p != &h->list) {
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struct hci_conn *c;
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c = list_entry(p, struct hci_conn, list);
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p = p->next;
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c->state = BT_CLOSED;
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hci_proto_disconn_ind(c, 0x16);
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hci_conn_del(c);
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}
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}
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int hci_get_conn_list(void __user *arg)
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{
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struct hci_conn_list_req req, *cl;
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struct hci_conn_info *ci;
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struct hci_dev *hdev;
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struct list_head *p;
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int n = 0, size, err;
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if (copy_from_user(&req, arg, sizeof(req)))
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return -EFAULT;
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if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
|
|
return -EINVAL;
|
|
|
|
size = sizeof(req) + req.conn_num * sizeof(*ci);
|
|
|
|
if (!(cl = kmalloc(size, GFP_KERNEL)))
|
|
return -ENOMEM;
|
|
|
|
if (!(hdev = hci_dev_get(req.dev_id))) {
|
|
kfree(cl);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ci = cl->conn_info;
|
|
|
|
hci_dev_lock_bh(hdev);
|
|
list_for_each(p, &hdev->conn_hash.list) {
|
|
register struct hci_conn *c;
|
|
c = list_entry(p, struct hci_conn, list);
|
|
|
|
bacpy(&(ci + n)->bdaddr, &c->dst);
|
|
(ci + n)->handle = c->handle;
|
|
(ci + n)->type = c->type;
|
|
(ci + n)->out = c->out;
|
|
(ci + n)->state = c->state;
|
|
(ci + n)->link_mode = c->link_mode;
|
|
if (++n >= req.conn_num)
|
|
break;
|
|
}
|
|
hci_dev_unlock_bh(hdev);
|
|
|
|
cl->dev_id = hdev->id;
|
|
cl->conn_num = n;
|
|
size = sizeof(req) + n * sizeof(*ci);
|
|
|
|
hci_dev_put(hdev);
|
|
|
|
err = copy_to_user(arg, cl, size);
|
|
kfree(cl);
|
|
|
|
return err ? -EFAULT : 0;
|
|
}
|
|
|
|
int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
|
|
{
|
|
struct hci_conn_info_req req;
|
|
struct hci_conn_info ci;
|
|
struct hci_conn *conn;
|
|
char __user *ptr = arg + sizeof(req);
|
|
|
|
if (copy_from_user(&req, arg, sizeof(req)))
|
|
return -EFAULT;
|
|
|
|
hci_dev_lock_bh(hdev);
|
|
conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
|
|
if (conn) {
|
|
bacpy(&ci.bdaddr, &conn->dst);
|
|
ci.handle = conn->handle;
|
|
ci.type = conn->type;
|
|
ci.out = conn->out;
|
|
ci.state = conn->state;
|
|
ci.link_mode = conn->link_mode;
|
|
}
|
|
hci_dev_unlock_bh(hdev);
|
|
|
|
if (!conn)
|
|
return -ENOENT;
|
|
|
|
return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
|
|
}
|