hci_sock.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:12k
- /*
- BlueZ - Bluetooth protocol stack for Linux
- Copyright (C) 2000-2001 Qualcomm Incorporated
- Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
- 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.
- */
- /*
- * BlueZ HCI socket layer.
- *
- * $Id: hci_sock.c,v 1.9 2001/08/05 06:02:16 maxk Exp $
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/errno.h>
- #include <linux/kernel.h>
- #include <linux/major.h>
- #include <linux/sched.h>
- #include <linux/slab.h>
- #include <linux/poll.h>
- #include <linux/fcntl.h>
- #include <linux/init.h>
- #include <linux/skbuff.h>
- #include <linux/tqueue.h>
- #include <linux/interrupt.h>
- #include <linux/socket.h>
- #include <linux/ioctl.h>
- #include <net/sock.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include <net/bluetooth/bluetooth.h>
- #include <net/bluetooth/bluez.h>
- #include <net/bluetooth/hci_core.h>
- #ifndef HCI_SOCK_DEBUG
- #undef DBG
- #define DBG( A... )
- #endif
- /* HCI socket interface */
- static struct bluez_sock_list hci_sk_list = {
- lock: RW_LOCK_UNLOCKED
- };
- static struct sock *hci_sock_lookup(struct hci_dev *hdev)
- {
- struct sock *sk;
- read_lock(&hci_sk_list.lock);
- for (sk = hci_sk_list.head; sk; sk = sk->next) {
- if (hci_pi(sk)->hdev == hdev)
- break;
- }
- read_unlock(&hci_sk_list.lock);
- return sk;
- }
- /* Send frame to RAW socket */
- void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
- {
- struct sock * sk;
- DBG("hdev %p len %d", hdev, skb->len);
- read_lock(&hci_sk_list.lock);
- for (sk = hci_sk_list.head; sk; sk = sk->next) {
- struct hci_filter *flt;
- struct sk_buff *nskb;
- if (sk->state != BT_BOUND || hci_pi(sk)->hdev != hdev)
- continue;
- /* Don't send frame to the socket it came from */
- if (skb->sk == sk)
- continue;
- /* Apply filter */
- flt = &hci_pi(sk)->filter;
- if (!test_bit(skb->pkt_type, &flt->type_mask))
- continue;
- if (skb->pkt_type == HCI_EVENT_PKT) {
- register int evt = (*(__u8 *)skb->data & 63);
- if (!test_bit(evt, &flt->event_mask))
- continue;
- }
- if (!(nskb = skb_clone(skb, GFP_ATOMIC)))
- continue;
- /* Put type byte before the data */
- memcpy(skb_push(nskb, 1), &nskb->pkt_type, 1);
- skb_queue_tail(&sk->receive_queue, nskb);
- sk->data_ready(sk, nskb->len);
- }
- read_unlock(&hci_sk_list.lock);
- }
- static int hci_sock_release(struct socket *sock)
- {
- struct sock *sk = sock->sk;
- struct hci_dev *hdev = hci_pi(sk)->hdev;
- DBG("sock %p sk %p", sock, sk);
- if (!sk)
- return 0;
- bluez_sock_unlink(&hci_sk_list, sk);
- if (hdev) {
- if (!hci_sock_lookup(hdev))
- hdev->flags &= ~HCI_SOCK;
- hci_dev_put(hdev);
- }
- sock_orphan(sk);
- skb_queue_purge(&sk->receive_queue);
- skb_queue_purge(&sk->write_queue);
- sock_put(sk);
- MOD_DEC_USE_COUNT;
- return 0;
- }
- static int hci_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
- {
- struct sock *sk = sock->sk;
- struct hci_dev *hdev = hci_pi(sk)->hdev;
- __u32 mode;
- DBG("cmd %x arg %lx", cmd, arg);
- switch (cmd) {
- case HCIGETINFO:
- return hci_dev_info(arg);
- case HCIGETDEVLIST:
- return hci_dev_list(arg);
- case HCIDEVUP:
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- return hci_dev_open(arg);
- case HCIDEVDOWN:
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- return hci_dev_close(arg);
- case HCIDEVRESET:
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- return hci_dev_reset(arg);
- case HCIRESETSTAT:
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- return hci_dev_reset_stat(arg);
- case HCISETSCAN:
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- return hci_dev_setscan(arg);
- case HCISETAUTH:
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- return hci_dev_setauth(arg);
- case HCISETRAW:
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- if (!hdev)
- return -EBADFD;
- if (arg)
- mode = HCI_RAW;
- else
- mode = HCI_NORMAL;
- return hci_dev_setmode(hdev, mode);
- case HCISETPTYPE:
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- return hci_dev_setptype(arg);
- case HCIINQUIRY:
- return hci_inquiry(arg);
- case HCIGETCONNLIST:
- return hci_conn_list(arg);
- default:
- return -EINVAL;
- };
- }
- static int hci_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
- {
- struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
- struct sock *sk = sock->sk;
- struct hci_dev *hdev = NULL;
- DBG("sock %p sk %p", sock, sk);
- if (!haddr || haddr->hci_family != AF_BLUETOOTH)
- return -EINVAL;
- if (hci_pi(sk)->hdev) {
- /* Already bound */
- return 0;
- }
- if (haddr->hci_dev != HCI_DEV_NONE) {
- if (!(hdev = hci_dev_get(haddr->hci_dev)))
- return -ENODEV;
- hdev->flags |= HCI_SOCK;
- }
- hci_pi(sk)->hdev = hdev;
- sk->state = BT_BOUND;
- return 0;
- }
- static int hci_sock_getname(struct socket *sock, struct sockaddr *addr, int *addr_len, int peer)
- {
- struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
- struct sock *sk = sock->sk;
- DBG("sock %p sk %p", sock, sk);
- *addr_len = sizeof(*haddr);
- haddr->hci_family = AF_BLUETOOTH;
- haddr->hci_dev = hci_pi(sk)->hdev->id;
- return 0;
- }
- static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg, int len,
- struct scm_cookie *scm)
- {
- struct sock *sk = sock->sk;
- struct hci_dev *hdev = hci_pi(sk)->hdev;
- struct sk_buff *skb;
- int err;
- DBG("sock %p sk %p", sock, sk);
- if (msg->msg_flags & MSG_OOB)
- return -EOPNOTSUPP;
- if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
- return -EINVAL;
- if (!hdev)
- return -EBADFD;
- if (!(skb = bluez_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err)))
- return err;
- if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
- kfree_skb(skb);
- return -EFAULT;
- }
- skb->dev = (void *) hdev;
- skb->pkt_type = *((unsigned char *) skb->data);
- skb_pull(skb, 1);
- /* Send frame to HCI core */
- hci_send_raw(skb);
- return len;
- }
- static inline void hci_sock_cmsg(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
- {
- __u32 mask = hci_pi(sk)->cmsg_mask;
- if (mask & HCI_CMSG_DIR)
- put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(int), &bluez_cb(skb)->incomming);
- }
-
- static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg, int len,
- int flags, struct scm_cookie *scm)
- {
- int noblock = flags & MSG_DONTWAIT;
- struct sock *sk = sock->sk;
- struct sk_buff *skb;
- int copied, err;
- DBG("sock %p sk %p", sock, sk);
- if (flags & (MSG_OOB | MSG_PEEK))
- return -EOPNOTSUPP;
- if (!(skb = skb_recv_datagram(sk, flags, noblock, &err)))
- return err;
- msg->msg_namelen = 0;
- copied = skb->len;
- if (len < copied) {
- msg->msg_flags |= MSG_TRUNC;
- copied = len;
- }
- skb->h.raw = skb->data;
- err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
- if (hci_pi(sk)->cmsg_mask)
- hci_sock_cmsg(sk, msg, skb);
- skb_free_datagram(sk, skb);
- return err ? : copied;
- }
- int hci_sock_setsockopt(struct socket *sock, int level, int optname, char *optval, int len)
- {
- struct sock *sk = sock->sk;
- struct hci_filter flt;
- int err = 0, opt = 0;
- DBG("sk %p, opt %d", sk, optname);
- lock_sock(sk);
- switch (optname) {
- case HCI_DATA_DIR:
- if (get_user(opt, (int *)optval))
- return -EFAULT;
- if (opt)
- hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
- else
- hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
- break;
- case HCI_FILTER:
- len = MIN(len, sizeof(struct hci_filter));
- if (copy_from_user(&flt, optval, len)) {
- err = -EFAULT;
- break;
- }
- memcpy(&hci_pi(sk)->filter, &flt, len);
- break;
- default:
- err = -ENOPROTOOPT;
- break;
- };
- release_sock(sk);
- return err;
- }
- int hci_sock_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen)
- {
- 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_FILTER:
- len = MIN(len, sizeof(struct hci_filter));
- if (copy_to_user(optval, &hci_pi(sk)->filter, len))
- return -EFAULT;
- break;
- default:
- return -ENOPROTOOPT;
- break;
- };
- return 0;
- }
- struct proto_ops hci_sock_ops = {
- family: PF_BLUETOOTH,
- 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 int hci_sock_create(struct socket *sock, int protocol)
- {
- struct sock *sk;
- DBG("sock %p", sock);
- if (sock->type != SOCK_RAW)
- return -ESOCKTNOSUPPORT;
- sock->ops = &hci_sock_ops;
- if (!(sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, 1)))
- return -ENOMEM;
- sock->state = SS_UNCONNECTED;
- sock_init_data(sock, sk);
- memset(&sk->protinfo, 0, sizeof(struct hci_pinfo));
- sk->destruct = NULL;
- sk->protocol = protocol;
- sk->state = BT_OPEN;
- /* Initialize filter */
- hci_pi(sk)->filter.type_mask = (1<<HCI_EVENT_PKT);
- hci_pi(sk)->filter.event_mask[0] = ~0L;
- hci_pi(sk)->filter.event_mask[1] = ~0L;
- bluez_sock_link(&hci_sk_list, sk);
- MOD_INC_USE_COUNT;
- 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 sk_buff *skb;
- DBG("hdev %s event %ld", hdev->name, event);
- /* Send event to sockets */
- if ((skb = bluez_skb_alloc(HCI_EVENT_HDR_SIZE + EVT_HCI_DEV_EVENT_SIZE, GFP_ATOMIC))) {
- hci_event_hdr eh = { EVT_HCI_DEV_EVENT, EVT_HCI_DEV_EVENT_SIZE };
- evt_hci_dev_event he = { event, hdev->id };
- skb->pkt_type = HCI_EVENT_PKT;
- memcpy(skb_put(skb, HCI_EVENT_HDR_SIZE), &eh, HCI_EVENT_HDR_SIZE);
- memcpy(skb_put(skb, EVT_HCI_DEV_EVENT_SIZE), &he, EVT_HCI_DEV_EVENT_SIZE);
- hci_send_to_sock(NULL, skb);
- kfree_skb(skb);
- }
- if (event == HCI_DEV_UNREG) {
- struct sock *sk;
- /* Detach sockets from device */
- read_lock(&hci_sk_list.lock);
- for (sk = hci_sk_list.head; sk; sk = sk->next) {
- if (hci_pi(sk)->hdev == hdev) {
- hci_pi(sk)->hdev = NULL;
- sk->err = EPIPE;
- sk->state = BT_OPEN;
- sk->state_change(sk);
- hci_dev_put(hdev);
- }
- }
- read_unlock(&hci_sk_list.lock);
- }
- return NOTIFY_DONE;
- }
- struct net_proto_family hci_sock_family_ops = {
- family: PF_BLUETOOTH,
- create: hci_sock_create
- };
- struct notifier_block hci_sock_nblock = {
- notifier_call: hci_sock_dev_event
- };
- int hci_sock_init(void)
- {
- if (bluez_sock_register(BTPROTO_HCI, &hci_sock_family_ops)) {
- ERR("Can't register HCI socket");
- return -EPROTO;
- }
- hci_register_notifier(&hci_sock_nblock);
- return 0;
- }
- int hci_sock_cleanup(void)
- {
- if (bluez_sock_unregister(BTPROTO_HCI))
- ERR("Can't unregister HCI socket");
- hci_unregister_notifier(&hci_sock_nblock);
- return 0;
- }