![David S. Miller](/assets/img/avatar_default.png)
This provides safety against negative optlen at the type level instead of depending upon (sometimes non-trivial) checks against this sprinkled all over the the place, in each and every implementation. Based upon work done by Arjan van de Ven and feedback from Linus Torvalds. Signed-off-by: David S. Miller <davem@davemloft.net>
733 lines
15 KiB
C
733 lines
15 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 sockets. */
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/capability.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/workqueue.h>
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#include <linux/interrupt.h>
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#include <linux/compat.h>
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#include <linux/socket.h>
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#include <linux/ioctl.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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/* ----- HCI socket interface ----- */
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static inline int hci_test_bit(int nr, void *addr)
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{
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return *((__u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
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}
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/* Security filter */
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static struct hci_sec_filter hci_sec_filter = {
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/* Packet types */
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0x10,
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/* Events */
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{ 0x1000d9fe, 0x0000b00c },
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/* Commands */
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{
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{ 0x0 },
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/* OGF_LINK_CTL */
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{ 0xbe000006, 0x00000001, 0x00000000, 0x00 },
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/* OGF_LINK_POLICY */
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{ 0x00005200, 0x00000000, 0x00000000, 0x00 },
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/* OGF_HOST_CTL */
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{ 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
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/* OGF_INFO_PARAM */
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{ 0x000002be, 0x00000000, 0x00000000, 0x00 },
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/* OGF_STATUS_PARAM */
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{ 0x000000ea, 0x00000000, 0x00000000, 0x00 }
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}
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};
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static struct bt_sock_list hci_sk_list = {
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.lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
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};
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/* Send frame to RAW socket */
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void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
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{
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struct sock *sk;
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struct hlist_node *node;
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BT_DBG("hdev %p len %d", hdev, skb->len);
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read_lock(&hci_sk_list.lock);
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sk_for_each(sk, node, &hci_sk_list.head) {
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struct hci_filter *flt;
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struct sk_buff *nskb;
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if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
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continue;
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/* Don't send frame to the socket it came from */
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if (skb->sk == sk)
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continue;
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/* Apply filter */
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flt = &hci_pi(sk)->filter;
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if (!test_bit((bt_cb(skb)->pkt_type == HCI_VENDOR_PKT) ?
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0 : (bt_cb(skb)->pkt_type & HCI_FLT_TYPE_BITS), &flt->type_mask))
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continue;
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if (bt_cb(skb)->pkt_type == HCI_EVENT_PKT) {
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register int evt = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);
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if (!hci_test_bit(evt, &flt->event_mask))
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continue;
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if (flt->opcode &&
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((evt == HCI_EV_CMD_COMPLETE &&
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flt->opcode !=
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get_unaligned((__le16 *)(skb->data + 3))) ||
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(evt == HCI_EV_CMD_STATUS &&
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flt->opcode !=
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get_unaligned((__le16 *)(skb->data + 4)))))
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continue;
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}
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if (!(nskb = skb_clone(skb, GFP_ATOMIC)))
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continue;
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/* Put type byte before the data */
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memcpy(skb_push(nskb, 1), &bt_cb(nskb)->pkt_type, 1);
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if (sock_queue_rcv_skb(sk, nskb))
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kfree_skb(nskb);
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}
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read_unlock(&hci_sk_list.lock);
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}
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static int hci_sock_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct hci_dev *hdev;
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BT_DBG("sock %p sk %p", sock, sk);
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if (!sk)
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return 0;
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hdev = hci_pi(sk)->hdev;
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bt_sock_unlink(&hci_sk_list, sk);
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if (hdev) {
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atomic_dec(&hdev->promisc);
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hci_dev_put(hdev);
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}
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sock_orphan(sk);
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skb_queue_purge(&sk->sk_receive_queue);
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skb_queue_purge(&sk->sk_write_queue);
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sock_put(sk);
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return 0;
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}
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/* Ioctls that require bound socket */
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static inline int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
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{
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struct hci_dev *hdev = hci_pi(sk)->hdev;
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if (!hdev)
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return -EBADFD;
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switch (cmd) {
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case HCISETRAW:
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if (!capable(CAP_NET_ADMIN))
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return -EACCES;
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if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
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return -EPERM;
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if (arg)
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set_bit(HCI_RAW, &hdev->flags);
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else
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clear_bit(HCI_RAW, &hdev->flags);
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return 0;
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case HCIGETCONNINFO:
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return hci_get_conn_info(hdev, (void __user *) arg);
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case HCIGETAUTHINFO:
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return hci_get_auth_info(hdev, (void __user *) arg);
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default:
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if (hdev->ioctl)
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return hdev->ioctl(hdev, cmd, arg);
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return -EINVAL;
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}
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}
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static int hci_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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{
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struct sock *sk = sock->sk;
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void __user *argp = (void __user *) arg;
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int err;
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BT_DBG("cmd %x arg %lx", cmd, arg);
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switch (cmd) {
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case HCIGETDEVLIST:
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return hci_get_dev_list(argp);
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case HCIGETDEVINFO:
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return hci_get_dev_info(argp);
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case HCIGETCONNLIST:
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return hci_get_conn_list(argp);
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case HCIDEVUP:
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if (!capable(CAP_NET_ADMIN))
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return -EACCES;
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return hci_dev_open(arg);
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case HCIDEVDOWN:
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if (!capable(CAP_NET_ADMIN))
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return -EACCES;
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return hci_dev_close(arg);
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case HCIDEVRESET:
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if (!capable(CAP_NET_ADMIN))
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return -EACCES;
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return hci_dev_reset(arg);
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case HCIDEVRESTAT:
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if (!capable(CAP_NET_ADMIN))
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return -EACCES;
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return hci_dev_reset_stat(arg);
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case HCISETSCAN:
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case HCISETAUTH:
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case HCISETENCRYPT:
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case HCISETPTYPE:
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case HCISETLINKPOL:
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case HCISETLINKMODE:
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case HCISETACLMTU:
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case HCISETSCOMTU:
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if (!capable(CAP_NET_ADMIN))
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return -EACCES;
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return hci_dev_cmd(cmd, argp);
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case HCIINQUIRY:
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return hci_inquiry(argp);
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default:
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lock_sock(sk);
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err = hci_sock_bound_ioctl(sk, cmd, arg);
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release_sock(sk);
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return err;
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}
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}
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static int hci_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
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{
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struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
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struct sock *sk = sock->sk;
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struct hci_dev *hdev = NULL;
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int err = 0;
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BT_DBG("sock %p sk %p", sock, sk);
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if (!haddr || haddr->hci_family != AF_BLUETOOTH)
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return -EINVAL;
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lock_sock(sk);
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if (hci_pi(sk)->hdev) {
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err = -EALREADY;
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goto done;
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}
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if (haddr->hci_dev != HCI_DEV_NONE) {
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if (!(hdev = hci_dev_get(haddr->hci_dev))) {
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err = -ENODEV;
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goto done;
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}
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atomic_inc(&hdev->promisc);
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}
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hci_pi(sk)->hdev = hdev;
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sk->sk_state = BT_BOUND;
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done:
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release_sock(sk);
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return err;
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}
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static int hci_sock_getname(struct socket *sock, struct sockaddr *addr, int *addr_len, int peer)
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{
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struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
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struct sock *sk = sock->sk;
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struct hci_dev *hdev = hci_pi(sk)->hdev;
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BT_DBG("sock %p sk %p", sock, sk);
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if (!hdev)
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return -EBADFD;
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lock_sock(sk);
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*addr_len = sizeof(*haddr);
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haddr->hci_family = AF_BLUETOOTH;
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haddr->hci_dev = hdev->id;
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release_sock(sk);
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return 0;
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}
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static inline void hci_sock_cmsg(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
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{
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__u32 mask = hci_pi(sk)->cmsg_mask;
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if (mask & HCI_CMSG_DIR) {
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int incoming = bt_cb(skb)->incoming;
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put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming), &incoming);
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}
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if (mask & HCI_CMSG_TSTAMP) {
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struct timeval tv;
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void *data;
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int len;
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skb_get_timestamp(skb, &tv);
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data = &tv;
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len = sizeof(tv);
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#ifdef CONFIG_COMPAT
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if (msg->msg_flags & MSG_CMSG_COMPAT) {
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struct compat_timeval ctv;
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ctv.tv_sec = tv.tv_sec;
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ctv.tv_usec = tv.tv_usec;
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data = &ctv;
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len = sizeof(ctv);
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}
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#endif
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put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
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}
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}
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static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t len, int flags)
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{
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int noblock = flags & MSG_DONTWAIT;
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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int copied, err;
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BT_DBG("sock %p, sk %p", sock, sk);
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if (flags & (MSG_OOB))
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return -EOPNOTSUPP;
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if (sk->sk_state == BT_CLOSED)
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return 0;
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if (!(skb = skb_recv_datagram(sk, flags, noblock, &err)))
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return err;
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msg->msg_namelen = 0;
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copied = skb->len;
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if (len < copied) {
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msg->msg_flags |= MSG_TRUNC;
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copied = len;
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}
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skb_reset_transport_header(skb);
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err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
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hci_sock_cmsg(sk, msg, skb);
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skb_free_datagram(sk, skb);
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return err ? : copied;
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}
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static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t len)
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{
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struct sock *sk = sock->sk;
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struct hci_dev *hdev;
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struct sk_buff *skb;
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int err;
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BT_DBG("sock %p sk %p", sock, sk);
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if (msg->msg_flags & MSG_OOB)
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return -EOPNOTSUPP;
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if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
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return -EINVAL;
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if (len < 4 || len > HCI_MAX_FRAME_SIZE)
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return -EINVAL;
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lock_sock(sk);
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if (!(hdev = hci_pi(sk)->hdev)) {
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err = -EBADFD;
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goto done;
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}
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if (!(skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err)))
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goto done;
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if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
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err = -EFAULT;
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goto drop;
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}
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bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
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skb_pull(skb, 1);
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skb->dev = (void *) hdev;
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if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
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u16 opcode = get_unaligned_le16(skb->data);
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u16 ogf = hci_opcode_ogf(opcode);
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u16 ocf = hci_opcode_ocf(opcode);
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|
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if (((ogf > HCI_SFLT_MAX_OGF) ||
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!hci_test_bit(ocf & HCI_FLT_OCF_BITS, &hci_sec_filter.ocf_mask[ogf])) &&
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!capable(CAP_NET_RAW)) {
|
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err = -EPERM;
|
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goto drop;
|
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}
|
|
|
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if (test_bit(HCI_RAW, &hdev->flags) || (ogf == 0x3f)) {
|
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skb_queue_tail(&hdev->raw_q, skb);
|
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hci_sched_tx(hdev);
|
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} else {
|
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skb_queue_tail(&hdev->cmd_q, skb);
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hci_sched_cmd(hdev);
|
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}
|
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} else {
|
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if (!capable(CAP_NET_RAW)) {
|
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err = -EPERM;
|
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goto drop;
|
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}
|
|
|
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skb_queue_tail(&hdev->raw_q, skb);
|
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hci_sched_tx(hdev);
|
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}
|
|
|
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err = len;
|
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|
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done:
|
|
release_sock(sk);
|
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return err;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
goto done;
|
|
}
|
|
|
|
static int hci_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int len)
|
|
{
|
|
struct hci_ufilter uf = { .opcode = 0 };
|
|
struct sock *sk = sock->sk;
|
|
int err = 0, opt = 0;
|
|
|
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BT_DBG("sk %p, opt %d", sk, optname);
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case HCI_DATA_DIR:
|
|
if (get_user(opt, (int __user *)optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opt)
|
|
hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
|
|
else
|
|
hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
|
|
break;
|
|
|
|
case HCI_TIME_STAMP:
|
|
if (get_user(opt, (int __user *)optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opt)
|
|
hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
|
|
else
|
|
hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
|
|
break;
|
|
|
|
case HCI_FILTER:
|
|
{
|
|
struct hci_filter *f = &hci_pi(sk)->filter;
|
|
|
|
uf.type_mask = f->type_mask;
|
|
uf.opcode = f->opcode;
|
|
uf.event_mask[0] = *((u32 *) f->event_mask + 0);
|
|
uf.event_mask[1] = *((u32 *) f->event_mask + 1);
|
|
}
|
|
|
|
len = min_t(unsigned int, len, sizeof(uf));
|
|
if (copy_from_user(&uf, optval, len)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (!capable(CAP_NET_RAW)) {
|
|
uf.type_mask &= hci_sec_filter.type_mask;
|
|
uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
|
|
uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
|
|
}
|
|
|
|
{
|
|
struct hci_filter *f = &hci_pi(sk)->filter;
|
|
|
|
f->type_mask = uf.type_mask;
|
|
f->opcode = uf.opcode;
|
|
*((u32 *) f->event_mask + 0) = uf.event_mask[0];
|
|
*((u32 *) f->event_mask + 1) = uf.event_mask[1];
|
|
}
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int hci_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
struct hci_ufilter uf;
|
|
struct sock *sk = sock->sk;
|
|
int len, opt;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
switch (optname) {
|
|
case HCI_DATA_DIR:
|
|
if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
|
|
opt = 1;
|
|
else
|
|
opt = 0;
|
|
|
|
if (put_user(opt, optval))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case HCI_TIME_STAMP:
|
|
if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
|
|
opt = 1;
|
|
else
|
|
opt = 0;
|
|
|
|
if (put_user(opt, optval))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case HCI_FILTER:
|
|
{
|
|
struct hci_filter *f = &hci_pi(sk)->filter;
|
|
|
|
uf.type_mask = f->type_mask;
|
|
uf.opcode = f->opcode;
|
|
uf.event_mask[0] = *((u32 *) f->event_mask + 0);
|
|
uf.event_mask[1] = *((u32 *) f->event_mask + 1);
|
|
}
|
|
|
|
len = min_t(unsigned int, len, sizeof(uf));
|
|
if (copy_to_user(optval, &uf, len))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct proto_ops hci_sock_ops = {
|
|
.family = PF_BLUETOOTH,
|
|
.owner = THIS_MODULE,
|
|
.release = hci_sock_release,
|
|
.bind = hci_sock_bind,
|
|
.getname = hci_sock_getname,
|
|
.sendmsg = hci_sock_sendmsg,
|
|
.recvmsg = hci_sock_recvmsg,
|
|
.ioctl = hci_sock_ioctl,
|
|
.poll = datagram_poll,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = hci_sock_setsockopt,
|
|
.getsockopt = hci_sock_getsockopt,
|
|
.connect = sock_no_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.mmap = sock_no_mmap
|
|
};
|
|
|
|
static struct proto hci_sk_proto = {
|
|
.name = "HCI",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct hci_pinfo)
|
|
};
|
|
|
|
static int hci_sock_create(struct net *net, struct socket *sock, int protocol)
|
|
{
|
|
struct sock *sk;
|
|
|
|
BT_DBG("sock %p", sock);
|
|
|
|
if (sock->type != SOCK_RAW)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
sock->ops = &hci_sock_ops;
|
|
|
|
sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
|
|
if (!sk)
|
|
return -ENOMEM;
|
|
|
|
sock_init_data(sock, sk);
|
|
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
|
|
sk->sk_protocol = protocol;
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
sk->sk_state = BT_OPEN;
|
|
|
|
bt_sock_link(&hci_sk_list, sk);
|
|
return 0;
|
|
}
|
|
|
|
static int hci_sock_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct hci_dev *hdev = (struct hci_dev *) ptr;
|
|
struct hci_ev_si_device ev;
|
|
|
|
BT_DBG("hdev %s event %ld", hdev->name, event);
|
|
|
|
/* Send event to sockets */
|
|
ev.event = event;
|
|
ev.dev_id = hdev->id;
|
|
hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
|
|
|
|
if (event == HCI_DEV_UNREG) {
|
|
struct sock *sk;
|
|
struct hlist_node *node;
|
|
|
|
/* Detach sockets from device */
|
|
read_lock(&hci_sk_list.lock);
|
|
sk_for_each(sk, node, &hci_sk_list.head) {
|
|
local_bh_disable();
|
|
bh_lock_sock_nested(sk);
|
|
if (hci_pi(sk)->hdev == hdev) {
|
|
hci_pi(sk)->hdev = NULL;
|
|
sk->sk_err = EPIPE;
|
|
sk->sk_state = BT_OPEN;
|
|
sk->sk_state_change(sk);
|
|
|
|
hci_dev_put(hdev);
|
|
}
|
|
bh_unlock_sock(sk);
|
|
local_bh_enable();
|
|
}
|
|
read_unlock(&hci_sk_list.lock);
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct net_proto_family hci_sock_family_ops = {
|
|
.family = PF_BLUETOOTH,
|
|
.owner = THIS_MODULE,
|
|
.create = hci_sock_create,
|
|
};
|
|
|
|
static struct notifier_block hci_sock_nblock = {
|
|
.notifier_call = hci_sock_dev_event
|
|
};
|
|
|
|
int __init hci_sock_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = proto_register(&hci_sk_proto, 0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
hci_register_notifier(&hci_sock_nblock);
|
|
|
|
BT_INFO("HCI socket layer initialized");
|
|
|
|
return 0;
|
|
|
|
error:
|
|
BT_ERR("HCI socket registration failed");
|
|
proto_unregister(&hci_sk_proto);
|
|
return err;
|
|
}
|
|
|
|
void __exit hci_sock_cleanup(void)
|
|
{
|
|
if (bt_sock_unregister(BTPROTO_HCI) < 0)
|
|
BT_ERR("HCI socket unregistration failed");
|
|
|
|
hci_unregister_notifier(&hci_sock_nblock);
|
|
|
|
proto_unregister(&hci_sk_proto);
|
|
}
|