![Linus Torvalds](/assets/img/avatar_default.png)
* 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6: Fix common misspellings
1158 lines
24 KiB
C
1158 lines
24 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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Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
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Copyright (C) 2010 Google Inc.
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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 L2CAP sockets. */
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/l2cap.h>
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/* ---- L2CAP timers ---- */
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static void l2cap_sock_timeout(unsigned long arg)
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{
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struct sock *sk = (struct sock *) arg;
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int reason;
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BT_DBG("sock %p state %d", sk, sk->sk_state);
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bh_lock_sock(sk);
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if (sock_owned_by_user(sk)) {
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/* sk is owned by user. Try again later */
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l2cap_sock_set_timer(sk, HZ / 5);
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bh_unlock_sock(sk);
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sock_put(sk);
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return;
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}
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if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
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reason = ECONNREFUSED;
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else if (sk->sk_state == BT_CONNECT &&
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l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
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reason = ECONNREFUSED;
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else
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reason = ETIMEDOUT;
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__l2cap_sock_close(sk, reason);
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bh_unlock_sock(sk);
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l2cap_sock_kill(sk);
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sock_put(sk);
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}
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void l2cap_sock_set_timer(struct sock *sk, long timeout)
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{
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BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
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sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
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}
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void l2cap_sock_clear_timer(struct sock *sk)
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{
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BT_DBG("sock %p state %d", sk, sk->sk_state);
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sk_stop_timer(sk, &sk->sk_timer);
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}
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static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
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{
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struct sock *sk;
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struct hlist_node *node;
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sk_for_each(sk, node, &l2cap_sk_list.head)
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if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
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goto found;
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sk = NULL;
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found:
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return sk;
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}
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static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
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{
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struct sock *sk = sock->sk;
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struct sockaddr_l2 la;
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int len, err = 0;
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BT_DBG("sk %p", sk);
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if (!addr || addr->sa_family != AF_BLUETOOTH)
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return -EINVAL;
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memset(&la, 0, sizeof(la));
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len = min_t(unsigned int, sizeof(la), alen);
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memcpy(&la, addr, len);
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if (la.l2_cid && la.l2_psm)
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return -EINVAL;
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lock_sock(sk);
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if (sk->sk_state != BT_OPEN) {
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err = -EBADFD;
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goto done;
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}
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if (la.l2_psm) {
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__u16 psm = __le16_to_cpu(la.l2_psm);
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/* PSM must be odd and lsb of upper byte must be 0 */
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if ((psm & 0x0101) != 0x0001) {
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err = -EINVAL;
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goto done;
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}
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/* Restrict usage of well-known PSMs */
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if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
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err = -EACCES;
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goto done;
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}
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}
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write_lock_bh(&l2cap_sk_list.lock);
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if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
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err = -EADDRINUSE;
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} else {
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/* Save source address */
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bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
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l2cap_pi(sk)->psm = la.l2_psm;
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l2cap_pi(sk)->sport = la.l2_psm;
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sk->sk_state = BT_BOUND;
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if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
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__le16_to_cpu(la.l2_psm) == 0x0003)
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l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
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}
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if (la.l2_cid)
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l2cap_pi(sk)->scid = la.l2_cid;
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write_unlock_bh(&l2cap_sk_list.lock);
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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 l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
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{
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struct sock *sk = sock->sk;
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struct sockaddr_l2 la;
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int len, err = 0;
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BT_DBG("sk %p", sk);
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if (!addr || alen < sizeof(addr->sa_family) ||
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addr->sa_family != AF_BLUETOOTH)
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return -EINVAL;
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memset(&la, 0, sizeof(la));
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len = min_t(unsigned int, sizeof(la), alen);
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memcpy(&la, addr, len);
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if (la.l2_cid && la.l2_psm)
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return -EINVAL;
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lock_sock(sk);
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if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM)
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&& !(la.l2_psm || la.l2_cid)) {
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err = -EINVAL;
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goto done;
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}
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switch (l2cap_pi(sk)->mode) {
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case L2CAP_MODE_BASIC:
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break;
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case L2CAP_MODE_ERTM:
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case L2CAP_MODE_STREAMING:
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if (!disable_ertm)
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break;
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/* fall through */
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default:
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err = -ENOTSUPP;
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goto done;
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}
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switch (sk->sk_state) {
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case BT_CONNECT:
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case BT_CONNECT2:
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case BT_CONFIG:
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/* Already connecting */
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goto wait;
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case BT_CONNECTED:
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/* Already connected */
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err = -EISCONN;
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goto done;
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case BT_OPEN:
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case BT_BOUND:
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/* Can connect */
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break;
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default:
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err = -EBADFD;
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goto done;
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}
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/* PSM must be odd and lsb of upper byte must be 0 */
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if ((__le16_to_cpu(la.l2_psm) & 0x0101) != 0x0001 &&
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sk->sk_type != SOCK_RAW && !la.l2_cid) {
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err = -EINVAL;
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goto done;
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}
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/* Set destination address and psm */
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bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
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l2cap_pi(sk)->psm = la.l2_psm;
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l2cap_pi(sk)->dcid = la.l2_cid;
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err = l2cap_do_connect(sk);
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if (err)
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goto done;
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wait:
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err = bt_sock_wait_state(sk, BT_CONNECTED,
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sock_sndtimeo(sk, flags & O_NONBLOCK));
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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 l2cap_sock_listen(struct socket *sock, int backlog)
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{
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struct sock *sk = sock->sk;
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int err = 0;
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BT_DBG("sk %p backlog %d", sk, backlog);
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lock_sock(sk);
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if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
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|| sk->sk_state != BT_BOUND) {
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err = -EBADFD;
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goto done;
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}
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switch (l2cap_pi(sk)->mode) {
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case L2CAP_MODE_BASIC:
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break;
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case L2CAP_MODE_ERTM:
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case L2CAP_MODE_STREAMING:
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if (!disable_ertm)
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break;
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/* fall through */
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default:
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err = -ENOTSUPP;
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goto done;
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}
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if (!l2cap_pi(sk)->psm && !l2cap_pi(sk)->dcid) {
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bdaddr_t *src = &bt_sk(sk)->src;
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u16 psm;
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err = -EINVAL;
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write_lock_bh(&l2cap_sk_list.lock);
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for (psm = 0x1001; psm < 0x1100; psm += 2)
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if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
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l2cap_pi(sk)->psm = cpu_to_le16(psm);
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l2cap_pi(sk)->sport = cpu_to_le16(psm);
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err = 0;
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break;
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}
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write_unlock_bh(&l2cap_sk_list.lock);
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if (err < 0)
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goto done;
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}
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sk->sk_max_ack_backlog = backlog;
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sk->sk_ack_backlog = 0;
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sk->sk_state = BT_LISTEN;
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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 l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
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{
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DECLARE_WAITQUEUE(wait, current);
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struct sock *sk = sock->sk, *nsk;
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long timeo;
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int err = 0;
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lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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if (sk->sk_state != BT_LISTEN) {
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err = -EBADFD;
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goto done;
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}
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timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
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BT_DBG("sk %p timeo %ld", sk, timeo);
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/* Wait for an incoming connection. (wake-one). */
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add_wait_queue_exclusive(sk_sleep(sk), &wait);
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while (!(nsk = bt_accept_dequeue(sk, newsock))) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (!timeo) {
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err = -EAGAIN;
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break;
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}
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release_sock(sk);
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timeo = schedule_timeout(timeo);
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lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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if (sk->sk_state != BT_LISTEN) {
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err = -EBADFD;
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break;
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}
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if (signal_pending(current)) {
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err = sock_intr_errno(timeo);
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break;
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}
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(sk_sleep(sk), &wait);
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if (err)
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goto done;
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newsock->state = SS_CONNECTED;
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BT_DBG("new socket %p", nsk);
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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 l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
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{
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struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
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struct sock *sk = sock->sk;
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BT_DBG("sock %p, sk %p", sock, sk);
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addr->sa_family = AF_BLUETOOTH;
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*len = sizeof(struct sockaddr_l2);
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if (peer) {
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la->l2_psm = l2cap_pi(sk)->psm;
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bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
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la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
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} else {
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la->l2_psm = l2cap_pi(sk)->sport;
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bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
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la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
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}
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return 0;
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}
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static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
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{
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struct sock *sk = sock->sk;
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struct l2cap_options opts;
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struct l2cap_conninfo cinfo;
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int len, err = 0;
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u32 opt;
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BT_DBG("sk %p", sk);
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if (get_user(len, optlen))
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return -EFAULT;
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lock_sock(sk);
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switch (optname) {
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case L2CAP_OPTIONS:
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memset(&opts, 0, sizeof(opts));
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opts.imtu = l2cap_pi(sk)->imtu;
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opts.omtu = l2cap_pi(sk)->omtu;
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opts.flush_to = l2cap_pi(sk)->flush_to;
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opts.mode = l2cap_pi(sk)->mode;
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opts.fcs = l2cap_pi(sk)->fcs;
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opts.max_tx = l2cap_pi(sk)->max_tx;
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opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
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|
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len = min_t(unsigned int, len, sizeof(opts));
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if (copy_to_user(optval, (char *) &opts, len))
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err = -EFAULT;
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|
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break;
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|
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case L2CAP_LM:
|
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switch (l2cap_pi(sk)->sec_level) {
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case BT_SECURITY_LOW:
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opt = L2CAP_LM_AUTH;
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break;
|
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case BT_SECURITY_MEDIUM:
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opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
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break;
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case BT_SECURITY_HIGH:
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opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
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L2CAP_LM_SECURE;
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break;
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default:
|
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opt = 0;
|
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break;
|
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}
|
|
|
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if (l2cap_pi(sk)->role_switch)
|
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opt |= L2CAP_LM_MASTER;
|
|
|
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if (l2cap_pi(sk)->force_reliable)
|
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opt |= L2CAP_LM_RELIABLE;
|
|
|
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if (put_user(opt, (u32 __user *) optval))
|
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err = -EFAULT;
|
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break;
|
|
|
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case L2CAP_CONNINFO:
|
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if (sk->sk_state != BT_CONNECTED &&
|
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!(sk->sk_state == BT_CONNECT2 &&
|
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bt_sk(sk)->defer_setup)) {
|
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err = -ENOTCONN;
|
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break;
|
|
}
|
|
|
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cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
|
|
memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
|
|
|
|
len = min_t(unsigned int, len, sizeof(cinfo));
|
|
if (copy_to_user(optval, (char *) &cinfo, len))
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct bt_security sec;
|
|
int len, err = 0;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (level == SOL_L2CAP)
|
|
return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
|
|
|
|
if (level != SOL_BLUETOOTH)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case BT_SECURITY:
|
|
if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
|
|
&& sk->sk_type != SOCK_RAW) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
sec.level = l2cap_pi(sk)->sec_level;
|
|
|
|
len = min_t(unsigned int, len, sizeof(sec));
|
|
if (copy_to_user(optval, (char *) &sec, len))
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
|
|
case BT_DEFER_SETUP:
|
|
if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
|
|
case BT_FLUSHABLE:
|
|
if (put_user(l2cap_pi(sk)->flushable, (u32 __user *) optval))
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2cap_options opts;
|
|
int len, err = 0;
|
|
u32 opt;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case L2CAP_OPTIONS:
|
|
if (sk->sk_state == BT_CONNECTED) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
opts.imtu = l2cap_pi(sk)->imtu;
|
|
opts.omtu = l2cap_pi(sk)->omtu;
|
|
opts.flush_to = l2cap_pi(sk)->flush_to;
|
|
opts.mode = l2cap_pi(sk)->mode;
|
|
opts.fcs = l2cap_pi(sk)->fcs;
|
|
opts.max_tx = l2cap_pi(sk)->max_tx;
|
|
opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
|
|
|
|
len = min_t(unsigned int, sizeof(opts), optlen);
|
|
if (copy_from_user((char *) &opts, optval, len)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
l2cap_pi(sk)->mode = opts.mode;
|
|
switch (l2cap_pi(sk)->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE;
|
|
break;
|
|
case L2CAP_MODE_ERTM:
|
|
case L2CAP_MODE_STREAMING:
|
|
if (!disable_ertm)
|
|
break;
|
|
/* fall through */
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
l2cap_pi(sk)->imtu = opts.imtu;
|
|
l2cap_pi(sk)->omtu = opts.omtu;
|
|
l2cap_pi(sk)->fcs = opts.fcs;
|
|
l2cap_pi(sk)->max_tx = opts.max_tx;
|
|
l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size;
|
|
break;
|
|
|
|
case L2CAP_LM:
|
|
if (get_user(opt, (u32 __user *) optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opt & L2CAP_LM_AUTH)
|
|
l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
|
|
if (opt & L2CAP_LM_ENCRYPT)
|
|
l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
|
|
if (opt & L2CAP_LM_SECURE)
|
|
l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
|
|
|
|
l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
|
|
l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct bt_security sec;
|
|
int len, err = 0;
|
|
u32 opt;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (level == SOL_L2CAP)
|
|
return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
|
|
|
|
if (level != SOL_BLUETOOTH)
|
|
return -ENOPROTOOPT;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case BT_SECURITY:
|
|
if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
|
|
&& sk->sk_type != SOCK_RAW) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
sec.level = BT_SECURITY_LOW;
|
|
|
|
len = min_t(unsigned int, sizeof(sec), optlen);
|
|
if (copy_from_user((char *) &sec, optval, len)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (sec.level < BT_SECURITY_LOW ||
|
|
sec.level > BT_SECURITY_HIGH) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
l2cap_pi(sk)->sec_level = sec.level;
|
|
break;
|
|
|
|
case BT_DEFER_SETUP:
|
|
if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (get_user(opt, (u32 __user *) optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
bt_sk(sk)->defer_setup = opt;
|
|
break;
|
|
|
|
case BT_FLUSHABLE:
|
|
if (get_user(opt, (u32 __user *) optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opt > BT_FLUSHABLE_ON) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (opt == BT_FLUSHABLE_OFF) {
|
|
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
|
|
/* proceed further only when we have l2cap_conn and
|
|
No Flush support in the LM */
|
|
if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
l2cap_pi(sk)->flushable = opt;
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct sk_buff *skb;
|
|
u16 control;
|
|
int err;
|
|
|
|
BT_DBG("sock %p, sk %p", sock, sk);
|
|
|
|
err = sock_error(sk);
|
|
if (err)
|
|
return err;
|
|
|
|
if (msg->msg_flags & MSG_OOB)
|
|
return -EOPNOTSUPP;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state != BT_CONNECTED) {
|
|
err = -ENOTCONN;
|
|
goto done;
|
|
}
|
|
|
|
/* Connectionless channel */
|
|
if (sk->sk_type == SOCK_DGRAM) {
|
|
skb = l2cap_create_connless_pdu(sk, msg, len);
|
|
if (IS_ERR(skb)) {
|
|
err = PTR_ERR(skb);
|
|
} else {
|
|
l2cap_do_send(sk, skb);
|
|
err = len;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
switch (pi->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
/* Check outgoing MTU */
|
|
if (len > pi->omtu) {
|
|
err = -EMSGSIZE;
|
|
goto done;
|
|
}
|
|
|
|
/* Create a basic PDU */
|
|
skb = l2cap_create_basic_pdu(sk, msg, len);
|
|
if (IS_ERR(skb)) {
|
|
err = PTR_ERR(skb);
|
|
goto done;
|
|
}
|
|
|
|
l2cap_do_send(sk, skb);
|
|
err = len;
|
|
break;
|
|
|
|
case L2CAP_MODE_ERTM:
|
|
case L2CAP_MODE_STREAMING:
|
|
/* Entire SDU fits into one PDU */
|
|
if (len <= pi->remote_mps) {
|
|
control = L2CAP_SDU_UNSEGMENTED;
|
|
skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
|
|
if (IS_ERR(skb)) {
|
|
err = PTR_ERR(skb);
|
|
goto done;
|
|
}
|
|
__skb_queue_tail(TX_QUEUE(sk), skb);
|
|
|
|
if (sk->sk_send_head == NULL)
|
|
sk->sk_send_head = skb;
|
|
|
|
} else {
|
|
/* Segment SDU into multiples PDUs */
|
|
err = l2cap_sar_segment_sdu(sk, msg, len);
|
|
if (err < 0)
|
|
goto done;
|
|
}
|
|
|
|
if (pi->mode == L2CAP_MODE_STREAMING) {
|
|
l2cap_streaming_send(sk);
|
|
} else {
|
|
if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
|
|
(pi->conn_state & L2CAP_CONN_WAIT_F)) {
|
|
err = len;
|
|
break;
|
|
}
|
|
err = l2cap_ertm_send(sk);
|
|
}
|
|
|
|
if (err >= 0)
|
|
err = len;
|
|
break;
|
|
|
|
default:
|
|
BT_DBG("bad state %1.1x", pi->mode);
|
|
err = -EBADFD;
|
|
}
|
|
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
|
|
struct l2cap_conn_rsp rsp;
|
|
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
|
|
u8 buf[128];
|
|
|
|
sk->sk_state = BT_CONFIG;
|
|
|
|
rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
|
|
rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
|
|
l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
|
|
L2CAP_CONN_RSP, sizeof(rsp), &rsp);
|
|
|
|
if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) {
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
|
l2cap_build_conf_req(sk, buf), buf);
|
|
l2cap_pi(sk)->num_conf_req++;
|
|
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
if (sock->type == SOCK_STREAM)
|
|
return bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
|
|
|
|
return bt_sock_recvmsg(iocb, sock, msg, len, flags);
|
|
}
|
|
|
|
/* Kill socket (only if zapped and orphan)
|
|
* Must be called on unlocked socket.
|
|
*/
|
|
void l2cap_sock_kill(struct sock *sk)
|
|
{
|
|
if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
|
|
return;
|
|
|
|
BT_DBG("sk %p state %d", sk, sk->sk_state);
|
|
|
|
/* Kill poor orphan */
|
|
bt_sock_unlink(&l2cap_sk_list, sk);
|
|
sock_set_flag(sk, SOCK_DEAD);
|
|
sock_put(sk);
|
|
}
|
|
|
|
/* Must be called on unlocked socket. */
|
|
static void l2cap_sock_close(struct sock *sk)
|
|
{
|
|
l2cap_sock_clear_timer(sk);
|
|
lock_sock(sk);
|
|
__l2cap_sock_close(sk, ECONNRESET);
|
|
release_sock(sk);
|
|
l2cap_sock_kill(sk);
|
|
}
|
|
|
|
static void l2cap_sock_cleanup_listen(struct sock *parent)
|
|
{
|
|
struct sock *sk;
|
|
|
|
BT_DBG("parent %p", parent);
|
|
|
|
/* Close not yet accepted channels */
|
|
while ((sk = bt_accept_dequeue(parent, NULL)))
|
|
l2cap_sock_close(sk);
|
|
|
|
parent->sk_state = BT_CLOSED;
|
|
sock_set_flag(parent, SOCK_ZAPPED);
|
|
}
|
|
|
|
void __l2cap_sock_close(struct sock *sk, int reason)
|
|
{
|
|
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
|
|
|
|
BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
|
|
|
|
switch (sk->sk_state) {
|
|
case BT_LISTEN:
|
|
l2cap_sock_cleanup_listen(sk);
|
|
break;
|
|
|
|
case BT_CONNECTED:
|
|
case BT_CONFIG:
|
|
if ((sk->sk_type == SOCK_SEQPACKET ||
|
|
sk->sk_type == SOCK_STREAM) &&
|
|
conn->hcon->type == ACL_LINK) {
|
|
l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
|
|
l2cap_send_disconn_req(conn, sk, reason);
|
|
} else
|
|
l2cap_chan_del(sk, reason);
|
|
break;
|
|
|
|
case BT_CONNECT2:
|
|
if ((sk->sk_type == SOCK_SEQPACKET ||
|
|
sk->sk_type == SOCK_STREAM) &&
|
|
conn->hcon->type == ACL_LINK) {
|
|
struct l2cap_conn_rsp rsp;
|
|
__u16 result;
|
|
|
|
if (bt_sk(sk)->defer_setup)
|
|
result = L2CAP_CR_SEC_BLOCK;
|
|
else
|
|
result = L2CAP_CR_BAD_PSM;
|
|
|
|
rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
rsp.result = cpu_to_le16(result);
|
|
rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
|
|
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
|
|
L2CAP_CONN_RSP, sizeof(rsp), &rsp);
|
|
}
|
|
|
|
l2cap_chan_del(sk, reason);
|
|
break;
|
|
|
|
case BT_CONNECT:
|
|
case BT_DISCONN:
|
|
l2cap_chan_del(sk, reason);
|
|
break;
|
|
|
|
default:
|
|
sock_set_flag(sk, SOCK_ZAPPED);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int l2cap_sock_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err = 0;
|
|
|
|
BT_DBG("sock %p, sk %p", sock, sk);
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
lock_sock(sk);
|
|
if (!sk->sk_shutdown) {
|
|
if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
|
|
err = __l2cap_wait_ack(sk);
|
|
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
l2cap_sock_clear_timer(sk);
|
|
__l2cap_sock_close(sk, 0);
|
|
|
|
if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
|
|
err = bt_sock_wait_state(sk, BT_CLOSED,
|
|
sk->sk_lingertime);
|
|
}
|
|
|
|
if (!err && sk->sk_err)
|
|
err = -sk->sk_err;
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err;
|
|
|
|
BT_DBG("sock %p, sk %p", sock, sk);
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
err = l2cap_sock_shutdown(sock, 2);
|
|
|
|
sock_orphan(sk);
|
|
l2cap_sock_kill(sk);
|
|
return err;
|
|
}
|
|
|
|
static void l2cap_sock_destruct(struct sock *sk)
|
|
{
|
|
BT_DBG("sk %p", sk);
|
|
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
skb_queue_purge(&sk->sk_write_queue);
|
|
}
|
|
|
|
void l2cap_sock_init(struct sock *sk, struct sock *parent)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (parent) {
|
|
sk->sk_type = parent->sk_type;
|
|
bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
|
|
|
|
pi->imtu = l2cap_pi(parent)->imtu;
|
|
pi->omtu = l2cap_pi(parent)->omtu;
|
|
pi->conf_state = l2cap_pi(parent)->conf_state;
|
|
pi->mode = l2cap_pi(parent)->mode;
|
|
pi->fcs = l2cap_pi(parent)->fcs;
|
|
pi->max_tx = l2cap_pi(parent)->max_tx;
|
|
pi->tx_win = l2cap_pi(parent)->tx_win;
|
|
pi->sec_level = l2cap_pi(parent)->sec_level;
|
|
pi->role_switch = l2cap_pi(parent)->role_switch;
|
|
pi->force_reliable = l2cap_pi(parent)->force_reliable;
|
|
pi->flushable = l2cap_pi(parent)->flushable;
|
|
} else {
|
|
pi->imtu = L2CAP_DEFAULT_MTU;
|
|
pi->omtu = 0;
|
|
if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
|
|
pi->mode = L2CAP_MODE_ERTM;
|
|
pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
|
|
} else {
|
|
pi->mode = L2CAP_MODE_BASIC;
|
|
}
|
|
pi->max_tx = L2CAP_DEFAULT_MAX_TX;
|
|
pi->fcs = L2CAP_FCS_CRC16;
|
|
pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
|
|
pi->sec_level = BT_SECURITY_LOW;
|
|
pi->role_switch = 0;
|
|
pi->force_reliable = 0;
|
|
pi->flushable = BT_FLUSHABLE_OFF;
|
|
}
|
|
|
|
/* Default config options */
|
|
pi->conf_len = 0;
|
|
pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
|
|
skb_queue_head_init(TX_QUEUE(sk));
|
|
skb_queue_head_init(SREJ_QUEUE(sk));
|
|
skb_queue_head_init(BUSY_QUEUE(sk));
|
|
INIT_LIST_HEAD(SREJ_LIST(sk));
|
|
}
|
|
|
|
static struct proto l2cap_proto = {
|
|
.name = "L2CAP",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct l2cap_pinfo)
|
|
};
|
|
|
|
struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
|
|
{
|
|
struct sock *sk;
|
|
|
|
sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
|
|
if (!sk)
|
|
return NULL;
|
|
|
|
sock_init_data(sock, sk);
|
|
INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
|
|
|
|
sk->sk_destruct = l2cap_sock_destruct;
|
|
sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
|
|
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
|
|
sk->sk_protocol = proto;
|
|
sk->sk_state = BT_OPEN;
|
|
|
|
setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
|
|
|
|
bt_sock_link(&l2cap_sk_list, sk);
|
|
return sk;
|
|
}
|
|
|
|
static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
struct sock *sk;
|
|
|
|
BT_DBG("sock %p", sock);
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
|
|
sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
|
|
return -EPERM;
|
|
|
|
sock->ops = &l2cap_sock_ops;
|
|
|
|
sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
|
|
if (!sk)
|
|
return -ENOMEM;
|
|
|
|
l2cap_sock_init(sk, NULL);
|
|
return 0;
|
|
}
|
|
|
|
const struct proto_ops l2cap_sock_ops = {
|
|
.family = PF_BLUETOOTH,
|
|
.owner = THIS_MODULE,
|
|
.release = l2cap_sock_release,
|
|
.bind = l2cap_sock_bind,
|
|
.connect = l2cap_sock_connect,
|
|
.listen = l2cap_sock_listen,
|
|
.accept = l2cap_sock_accept,
|
|
.getname = l2cap_sock_getname,
|
|
.sendmsg = l2cap_sock_sendmsg,
|
|
.recvmsg = l2cap_sock_recvmsg,
|
|
.poll = bt_sock_poll,
|
|
.ioctl = bt_sock_ioctl,
|
|
.mmap = sock_no_mmap,
|
|
.socketpair = sock_no_socketpair,
|
|
.shutdown = l2cap_sock_shutdown,
|
|
.setsockopt = l2cap_sock_setsockopt,
|
|
.getsockopt = l2cap_sock_getsockopt
|
|
};
|
|
|
|
static const struct net_proto_family l2cap_sock_family_ops = {
|
|
.family = PF_BLUETOOTH,
|
|
.owner = THIS_MODULE,
|
|
.create = l2cap_sock_create,
|
|
};
|
|
|
|
int __init l2cap_init_sockets(void)
|
|
{
|
|
int err;
|
|
|
|
err = proto_register(&l2cap_proto, 0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
BT_INFO("L2CAP socket layer initialized");
|
|
|
|
return 0;
|
|
|
|
error:
|
|
BT_ERR("L2CAP socket registration failed");
|
|
proto_unregister(&l2cap_proto);
|
|
return err;
|
|
}
|
|
|
|
void l2cap_cleanup_sockets(void)
|
|
{
|
|
if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
|
|
BT_ERR("L2CAP socket unregistration failed");
|
|
|
|
proto_unregister(&l2cap_proto);
|
|
}
|