l2cap.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:45k
- /*
- 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 L2CAP core and sockets.
- *
- * $Id: l2cap.c,v 1.15 2002/09/09 01:14:52 maxk Exp $
- */
- #define VERSION "2.1"
- #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/interrupt.h>
- #include <linux/socket.h>
- #include <linux/skbuff.h>
- #include <linux/proc_fs.h>
- #include <linux/list.h>
- #include <net/sock.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include <asm/unaligned.h>
- #include <net/bluetooth/bluetooth.h>
- #include <net/bluetooth/hci_core.h>
- #include <net/bluetooth/l2cap.h>
- #ifndef L2CAP_DEBUG
- #undef BT_DBG
- #define BT_DBG( A... )
- #endif
- static struct proto_ops l2cap_sock_ops;
- struct bluez_sock_list l2cap_sk_list = {
- lock: RW_LOCK_UNLOCKED
- };
- static int l2cap_conn_del(struct hci_conn *conn, int err);
- static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent);
- static void l2cap_chan_del(struct sock *sk, int err);
- static int l2cap_chan_send(struct sock *sk, struct msghdr *msg, int len);
- static void __l2cap_sock_close(struct sock *sk, int reason);
- static void l2cap_sock_close(struct sock *sk);
- static void l2cap_sock_kill(struct sock *sk);
- static int l2cap_send_req(struct l2cap_conn *conn, __u8 code, __u16 len, void *data);
- static int l2cap_send_rsp(struct l2cap_conn *conn, __u8 ident, __u8 code, __u16 len, void *data);
- /* ----- L2CAP timers ------ */
- static void l2cap_sock_timeout(unsigned long arg)
- {
- struct sock *sk = (struct sock *) arg;
- BT_DBG("sock %p state %d", sk, sk->state);
- bh_lock_sock(sk);
- __l2cap_sock_close(sk, ETIMEDOUT);
- bh_unlock_sock(sk);
- l2cap_sock_kill(sk);
- sock_put(sk);
- }
- static void l2cap_sock_set_timer(struct sock *sk, long timeout)
- {
- BT_DBG("sk %p state %d timeout %ld", sk, sk->state, timeout);
- if (!mod_timer(&sk->timer, jiffies + timeout))
- sock_hold(sk);
- }
- static void l2cap_sock_clear_timer(struct sock *sk)
- {
- BT_DBG("sock %p state %d", sk, sk->state);
- if (timer_pending(&sk->timer) && del_timer(&sk->timer))
- __sock_put(sk);
- }
- static void l2cap_sock_init_timer(struct sock *sk)
- {
- init_timer(&sk->timer);
- sk->timer.function = l2cap_sock_timeout;
- sk->timer.data = (unsigned long)sk;
- }
- /* -------- L2CAP connections --------- */
- static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, __u8 status)
- {
- struct l2cap_conn *conn;
- if ((conn = hcon->l2cap_data))
- return conn;
- if (status)
- return conn;
- if (!(conn = kmalloc(sizeof(struct l2cap_conn), GFP_ATOMIC)))
- return NULL;
- memset(conn, 0, sizeof(struct l2cap_conn));
- hcon->l2cap_data = conn;
- conn->hcon = hcon;
-
- conn->mtu = hcon->hdev->acl_mtu;
- conn->src = &hcon->hdev->bdaddr;
- conn->dst = &hcon->dst;
-
- spin_lock_init(&conn->lock);
- conn->chan_list.lock = RW_LOCK_UNLOCKED;
- BT_DBG("hcon %p conn %p", hcon, conn);
- MOD_INC_USE_COUNT;
- return conn;
- }
- static int l2cap_conn_del(struct hci_conn *hcon, int err)
- {
- struct l2cap_conn *conn;
- struct sock *sk;
- if (!(conn = hcon->l2cap_data))
- return 0;
- BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
- if (conn->rx_skb)
- kfree_skb(conn->rx_skb);
- /* Kill channels */
- while ((sk = conn->chan_list.head)) {
- bh_lock_sock(sk);
- l2cap_chan_del(sk, err);
- bh_unlock_sock(sk);
- l2cap_sock_kill(sk);
- }
- hcon->l2cap_data = NULL;
- kfree(conn);
- MOD_DEC_USE_COUNT;
- return 0;
- }
- int l2cap_connect(struct sock *sk)
- {
- bdaddr_t *src = &bluez_pi(sk)->src;
- bdaddr_t *dst = &bluez_pi(sk)->dst;
- struct l2cap_conn *conn;
- struct hci_conn *hcon;
- struct hci_dev *hdev;
- int err = 0;
- BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), l2cap_pi(sk)->psm);
- if (!(hdev = hci_get_route(dst, src)))
- return -EHOSTUNREACH;
- hci_dev_lock_bh(hdev);
- err = -ENOMEM;
- hcon = hci_connect(hdev, ACL_LINK, dst);
- if (!hcon)
- goto done;
- conn = l2cap_conn_add(hcon, 0);
- if (!conn) {
- hci_conn_put(hcon);
- goto done;
- }
- err = 0;
- /* Update source addr of the socket */
- bacpy(src, conn->src);
- l2cap_chan_add(conn, sk, NULL);
- sk->state = BT_CONNECT;
- l2cap_sock_set_timer(sk, sk->sndtimeo);
- if (hcon->state == BT_CONNECTED) {
- if (sk->type == SOCK_SEQPACKET) {
- l2cap_conn_req req;
- req.scid = __cpu_to_le16(l2cap_pi(sk)->scid);
- req.psm = l2cap_pi(sk)->psm;
- l2cap_send_req(conn, L2CAP_CONN_REQ, L2CAP_CONN_REQ_SIZE, &req);
- } else {
- l2cap_sock_clear_timer(sk);
- sk->state = BT_CONNECTED;
- }
- }
- done:
- hci_dev_unlock_bh(hdev);
- hci_dev_put(hdev);
- return err;
- }
- /* -------- Socket interface ---------- */
- static struct sock *__l2cap_get_sock_by_addr(__u16 psm, bdaddr_t *src)
- {
- struct sock *sk;
- for (sk = l2cap_sk_list.head; sk; sk = sk->next) {
- if (l2cap_pi(sk)->psm == psm &&
- !bacmp(&bluez_pi(sk)->src, src))
- break;
- }
- return sk;
- }
- /* Find socket with psm and source bdaddr.
- * Returns closest match.
- */
- static struct sock *__l2cap_get_sock_by_psm(int state, __u16 psm, bdaddr_t *src)
- {
- struct sock *sk, *sk1 = NULL;
- for (sk = l2cap_sk_list.head; sk; sk = sk->next) {
- if (state && sk->state != state)
- continue;
- if (l2cap_pi(sk)->psm == psm) {
- /* Exact match. */
- if (!bacmp(&bluez_pi(sk)->src, src))
- break;
- /* Closest match */
- if (!bacmp(&bluez_pi(sk)->src, BDADDR_ANY))
- sk1 = sk;
- }
- }
- return sk ? sk : sk1;
- }
- /* Find socket with given address (psm, src).
- * Returns locked socket */
- static inline struct sock *l2cap_get_sock_by_psm(int state, __u16 psm, bdaddr_t *src)
- {
- struct sock *s;
- read_lock(&l2cap_sk_list.lock);
- s = __l2cap_get_sock_by_psm(state, psm, src);
- if (s) bh_lock_sock(s);
- read_unlock(&l2cap_sk_list.lock);
- return s;
- }
- static void l2cap_sock_destruct(struct sock *sk)
- {
- BT_DBG("sk %p", sk);
- skb_queue_purge(&sk->receive_queue);
- skb_queue_purge(&sk->write_queue);
- MOD_DEC_USE_COUNT;
- }
- static void l2cap_sock_cleanup_listen(struct sock *parent)
- {
- struct sock *sk;
- BT_DBG("parent %p", parent);
- /* Close not yet accepted channels */
- while ((sk = bluez_accept_dequeue(parent, NULL)))
- l2cap_sock_close(sk);
- parent->state = BT_CLOSED;
- parent->zapped = 1;
- }
- /* Kill socket (only if zapped and orphan)
- * Must be called on unlocked socket.
- */
- static void l2cap_sock_kill(struct sock *sk)
- {
- if (!sk->zapped || sk->socket)
- return;
- BT_DBG("sk %p state %d", sk, sk->state);
- /* Kill poor orphan */
- bluez_sock_unlink(&l2cap_sk_list, sk);
- sk->dead = 1;
- sock_put(sk);
- }
- /* Close socket.
- */
- static void __l2cap_sock_close(struct sock *sk, int reason)
- {
- BT_DBG("sk %p state %d socket %p", sk, sk->state, sk->socket);
- switch (sk->state) {
- case BT_LISTEN:
- l2cap_sock_cleanup_listen(sk);
- break;
- case BT_CONNECTED:
- case BT_CONFIG:
- case BT_CONNECT2:
- if (sk->type == SOCK_SEQPACKET) {
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- l2cap_disconn_req req;
- sk->state = BT_DISCONN;
- l2cap_sock_set_timer(sk, HZ * 5);
- req.dcid = __cpu_to_le16(l2cap_pi(sk)->dcid);
- req.scid = __cpu_to_le16(l2cap_pi(sk)->scid);
- l2cap_send_req(conn, L2CAP_DISCONN_REQ, L2CAP_DISCONN_REQ_SIZE, &req);
- } else {
- l2cap_chan_del(sk, reason);
- }
- break;
- case BT_CONNECT:
- case BT_DISCONN:
- l2cap_chan_del(sk, reason);
- break;
- default:
- sk->zapped = 1;
- break;
- };
- }
- /* 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_init(struct sock *sk, struct sock *parent)
- {
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- BT_DBG("sk %p", sk);
- if (parent) {
- sk->type = parent->type;
- pi->imtu = l2cap_pi(parent)->imtu;
- pi->omtu = l2cap_pi(parent)->omtu;
- pi->link_mode = l2cap_pi(parent)->link_mode;
- } else {
- pi->imtu = L2CAP_DEFAULT_MTU;
- pi->omtu = 0;
- pi->link_mode = 0;
- }
- /* Default config options */
- pi->conf_mtu = L2CAP_DEFAULT_MTU;
- pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
- }
- static struct sock *l2cap_sock_alloc(struct socket *sock, int proto, int prio)
- {
- struct sock *sk;
- if (!(sk = sk_alloc(PF_BLUETOOTH, prio, 1)))
- return NULL;
- bluez_sock_init(sock, sk);
-
- sk->zapped = 0;
- sk->destruct = l2cap_sock_destruct;
- sk->sndtimeo = L2CAP_CONN_TIMEOUT;
- sk->protocol = proto;
- sk->state = BT_OPEN;
- l2cap_sock_init_timer(sk);
- bluez_sock_link(&l2cap_sk_list, sk);
- MOD_INC_USE_COUNT;
- return sk;
- }
- static int l2cap_sock_create(struct socket *sock, int protocol)
- {
- struct sock *sk;
- BT_DBG("sock %p", sock);
- sock->state = SS_UNCONNECTED;
- if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
- return -ESOCKTNOSUPPORT;
- sock->ops = &l2cap_sock_ops;
- if (!(sk = l2cap_sock_alloc(sock, protocol, GFP_KERNEL)))
- return -ENOMEM;
- l2cap_sock_init(sk, NULL);
- return 0;
- }
- static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
- {
- struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
- struct sock *sk = sock->sk;
- int err = 0;
- BT_DBG("sk %p, %s %d", sk, batostr(&la->l2_bdaddr), la->l2_psm);
- if (!addr || addr->sa_family != AF_BLUETOOTH)
- return -EINVAL;
- lock_sock(sk);
- if (sk->state != BT_OPEN) {
- err = -EBADFD;
- goto done;
- }
- write_lock_bh(&l2cap_sk_list.lock);
- if (la->l2_psm && __l2cap_get_sock_by_addr(la->l2_psm, &la->l2_bdaddr)) {
- err = -EADDRINUSE;
- } else {
- /* Save source address */
- bacpy(&bluez_pi(sk)->src, &la->l2_bdaddr);
- l2cap_pi(sk)->psm = la->l2_psm;
- sk->state = BT_BOUND;
- }
- write_unlock_bh(&l2cap_sk_list.lock);
- done:
- release_sock(sk);
- return err;
- }
- static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
- {
- struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
- struct sock *sk = sock->sk;
- int err = 0;
- lock_sock(sk);
- BT_DBG("sk %p", sk);
- if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_l2)) {
- err = -EINVAL;
- goto done;
- }
- if (sk->type == SOCK_SEQPACKET && !la->l2_psm) {
- err = -EINVAL;
- goto done;
- }
- switch(sk->state) {
- case BT_CONNECT:
- case BT_CONNECT2:
- case BT_CONFIG:
- /* Already connecting */
- goto wait;
- case BT_CONNECTED:
- /* Already connected */
- goto done;
- case BT_OPEN:
- case BT_BOUND:
- /* Can connect */
- break;
- default:
- err = -EBADFD;
- goto done;
- }
- /* Set destination address and psm */
- bacpy(&bluez_pi(sk)->dst, &la->l2_bdaddr);
- l2cap_pi(sk)->psm = la->l2_psm;
- if ((err = l2cap_connect(sk)))
- goto done;
- wait:
- err = bluez_sock_w4_connect(sk, flags);
- done:
- release_sock(sk);
- return err;
- }
- int l2cap_sock_listen(struct socket *sock, int backlog)
- {
- struct sock *sk = sock->sk;
- int err = 0;
- BT_DBG("sk %p backlog %d", sk, backlog);
- lock_sock(sk);
- if (sk->state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
- err = -EBADFD;
- goto done;
- }
- if (!l2cap_pi(sk)->psm) {
- err = -EINVAL;
- goto done;
- }
- sk->max_ack_backlog = backlog;
- sk->ack_backlog = 0;
- sk->state = BT_LISTEN;
- done:
- release_sock(sk);
- return err;
- }
- int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
- {
- DECLARE_WAITQUEUE(wait, current);
- struct sock *sk = sock->sk, *nsk;
- long timeo;
- int err = 0;
- lock_sock(sk);
- if (sk->state != BT_LISTEN) {
- err = -EBADFD;
- goto done;
- }
- timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
- BT_DBG("sk %p timeo %ld", sk, timeo);
- /* Wait for an incoming connection. (wake-one). */
- add_wait_queue_exclusive(sk->sleep, &wait);
- while (!(nsk = bluez_accept_dequeue(sk, newsock))) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (!timeo) {
- err = -EAGAIN;
- break;
- }
- release_sock(sk);
- timeo = schedule_timeout(timeo);
- lock_sock(sk);
- if (sk->state != BT_LISTEN) {
- err = -EBADFD;
- break;
- }
- if (signal_pending(current)) {
- err = sock_intr_errno(timeo);
- break;
- }
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(sk->sleep, &wait);
- if (err)
- goto done;
- newsock->state = SS_CONNECTED;
- BT_DBG("new socket %p", nsk);
- done:
- release_sock(sk);
- return err;
- }
- static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
- {
- struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
- struct sock *sk = sock->sk;
- BT_DBG("sock %p, sk %p", sock, sk);
- addr->sa_family = AF_BLUETOOTH;
- *len = sizeof(struct sockaddr_l2);
- if (peer)
- bacpy(&la->l2_bdaddr, &bluez_pi(sk)->dst);
- else
- bacpy(&la->l2_bdaddr, &bluez_pi(sk)->src);
- la->l2_psm = l2cap_pi(sk)->psm;
- return 0;
- }
- static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg, int len, struct scm_cookie *scm)
- {
- struct sock *sk = sock->sk;
- int err = 0;
- BT_DBG("sock %p, sk %p", sock, sk);
- if (sk->err)
- return sock_error(sk);
- if (msg->msg_flags & MSG_OOB)
- return -EOPNOTSUPP;
- /* Check outgoing MTU */
- if (len > l2cap_pi(sk)->omtu)
- return -EINVAL;
- lock_sock(sk);
- if (sk->state == BT_CONNECTED)
- err = l2cap_chan_send(sk, msg, len);
- else
- err = -ENOTCONN;
- release_sock(sk);
- return err;
- }
- static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen)
- {
- struct sock *sk = sock->sk;
- struct l2cap_options opts;
- int err = 0, len;
- __u32 opt;
- BT_DBG("sk %p", sk);
- lock_sock(sk);
- switch (optname) {
- case L2CAP_OPTIONS:
- len = MIN(sizeof(opts), optlen);
- if (copy_from_user((char *)&opts, optval, len)) {
- err = -EFAULT;
- break;
- }
- l2cap_pi(sk)->imtu = opts.imtu;
- l2cap_pi(sk)->omtu = opts.omtu;
- break;
- case L2CAP_LM:
- if (get_user(opt, (__u32 *)optval)) {
- err = -EFAULT;
- break;
- }
- l2cap_pi(sk)->link_mode = opt;
- break;
- default:
- err = -ENOPROTOOPT;
- break;
- }
- release_sock(sk);
- return err;
- }
- static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen)
- {
- struct sock *sk = sock->sk;
- struct l2cap_options opts;
- struct l2cap_conninfo cinfo;
- int len, err = 0;
- if (get_user(len, optlen))
- return -EFAULT;
- lock_sock(sk);
- switch (optname) {
- case L2CAP_OPTIONS:
- opts.imtu = l2cap_pi(sk)->imtu;
- opts.omtu = l2cap_pi(sk)->omtu;
- opts.flush_to = l2cap_pi(sk)->flush_to;
- len = MIN(len, sizeof(opts));
- if (copy_to_user(optval, (char *)&opts, len))
- err = -EFAULT;
- break;
- case L2CAP_LM:
- if (put_user(l2cap_pi(sk)->link_mode, (__u32 *)optval))
- err = -EFAULT;
- break;
- case L2CAP_CONNINFO:
- if (sk->state != BT_CONNECTED) {
- err = -ENOTCONN;
- break;
- }
- cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
- len = MIN(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_shutdown(struct socket *sock, int how)
- {
- struct sock *sk = sock->sk;
- BT_DBG("sock %p, sk %p", sock, sk);
- if (!sk) return 0;
- l2cap_sock_clear_timer(sk);
- lock_sock(sk);
- sk->shutdown = SHUTDOWN_MASK;
- __l2cap_sock_close(sk, ECONNRESET);
- release_sock(sk);
- return 0;
- }
- static int l2cap_sock_release(struct socket *sock)
- {
- struct sock *sk = sock->sk;
- BT_DBG("sock %p, sk %p", sock, sk);
- if (!sk) return 0;
- sock_orphan(sk);
- l2cap_sock_close(sk);
- return 0;
- }
- /* --------- L2CAP channels --------- */
- static struct sock * __l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, __u16 cid)
- {
- struct sock *s;
- for (s = l->head; s; s = l2cap_pi(s)->next_c) {
- if (l2cap_pi(s)->dcid == cid)
- break;
- }
- return s;
- }
- static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, __u16 cid)
- {
- struct sock *s;
- for (s = l->head; s; s = l2cap_pi(s)->next_c) {
- if (l2cap_pi(s)->scid == cid)
- break;
- }
- return s;
- }
- /* Find channel with given SCID.
- * Returns locked socket */
- static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, __u16 cid)
- {
- struct sock *s;
- read_lock(&l->lock);
- s = __l2cap_get_chan_by_scid(l, cid);
- if (s) bh_lock_sock(s);
- read_unlock(&l->lock);
- return s;
- }
- static __u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
- {
- __u16 cid = 0x0040;
- for (; cid < 0xffff; cid++) {
- if(!__l2cap_get_chan_by_scid(l, cid))
- return cid;
- }
- return 0;
- }
- static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
- {
- sock_hold(sk);
- if (l->head)
- l2cap_pi(l->head)->prev_c = sk;
- l2cap_pi(sk)->next_c = l->head;
- l2cap_pi(sk)->prev_c = NULL;
- l->head = sk;
- }
- static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
- {
- struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
- write_lock(&l->lock);
- if (sk == l->head)
- l->head = next;
- if (next)
- l2cap_pi(next)->prev_c = prev;
- if (prev)
- l2cap_pi(prev)->next_c = next;
- write_unlock(&l->lock);
- __sock_put(sk);
- }
- static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
- {
- struct l2cap_chan_list *l = &conn->chan_list;
- BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
- l2cap_pi(sk)->conn = conn;
- if (sk->type == SOCK_SEQPACKET) {
- /* Alloc CID for connection-oriented socket */
- l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
- } else if (sk->type == SOCK_DGRAM) {
- /* Connectionless socket */
- l2cap_pi(sk)->scid = 0x0002;
- l2cap_pi(sk)->dcid = 0x0002;
- l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
- } else {
- /* Raw socket can send/recv signalling messages only */
- l2cap_pi(sk)->scid = 0x0001;
- l2cap_pi(sk)->dcid = 0x0001;
- l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
- }
- __l2cap_chan_link(l, sk);
- if (parent)
- bluez_accept_enqueue(parent, sk);
- }
- static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
- {
- struct l2cap_chan_list *l = &conn->chan_list;
- write_lock(&l->lock);
- __l2cap_chan_add(conn, sk, parent);
- write_unlock(&l->lock);
- }
- /* Delete channel.
- * Must be called on the locked socket. */
- static void l2cap_chan_del(struct sock *sk, int err)
- {
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- struct sock *parent = bluez_pi(sk)->parent;
- l2cap_sock_clear_timer(sk);
- BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
- if (conn) {
- /* Unlink from channel list */
- l2cap_chan_unlink(&conn->chan_list, sk);
- l2cap_pi(sk)->conn = NULL;
- hci_conn_put(conn->hcon);
- }
- sk->state = BT_CLOSED;
- sk->err = err;
- sk->zapped = 1;
- if (parent)
- parent->data_ready(parent, 0);
- else
- sk->state_change(sk);
- }
- static void l2cap_conn_ready(struct l2cap_conn *conn)
- {
- struct l2cap_chan_list *l = &conn->chan_list;
- struct sock *sk;
- BT_DBG("conn %p", conn);
- read_lock(&l->lock);
- for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
- bh_lock_sock(sk);
- if (sk->type != SOCK_SEQPACKET) {
- l2cap_sock_clear_timer(sk);
- sk->state = BT_CONNECTED;
- sk->state_change(sk);
- } else if (sk->state == BT_CONNECT) {
- l2cap_conn_req req;
- req.scid = __cpu_to_le16(l2cap_pi(sk)->scid);
- req.psm = l2cap_pi(sk)->psm;
- l2cap_send_req(conn, L2CAP_CONN_REQ, L2CAP_CONN_REQ_SIZE, &req);
- }
- bh_unlock_sock(sk);
- }
- read_unlock(&l->lock);
- }
- static void l2cap_chan_ready(struct sock *sk)
- {
- struct sock *parent = bluez_pi(sk)->parent;
- BT_DBG("sk %p, parent %p", sk, parent);
- l2cap_pi(sk)->conf_state = 0;
- l2cap_sock_clear_timer(sk);
- if (!parent) {
- /* Outgoing channel.
- * Wake up socket sleeping on connect.
- */
- sk->state = BT_CONNECTED;
- sk->state_change(sk);
- } else {
- /* Incomming channel.
- * Wake up socket sleeping on accept.
- */
- parent->data_ready(parent, 0);
- }
- }
- /* Copy frame to all raw sockets on that connection */
- void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
- {
- struct l2cap_chan_list *l = &conn->chan_list;
- struct sk_buff *nskb;
- struct sock * sk;
- BT_DBG("conn %p", conn);
- read_lock(&l->lock);
- for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
- if (sk->type != SOCK_RAW)
- continue;
- /* Don't send frame to the socket it came from */
- if (skb->sk == sk)
- continue;
- if (!(nskb = skb_clone(skb, GFP_ATOMIC)))
- continue;
- if (sock_queue_rcv_skb(sk, nskb))
- kfree_skb(nskb);
- }
- read_unlock(&l->lock);
- }
- static int l2cap_chan_send(struct sock *sk, struct msghdr *msg, int len)
- {
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- struct sk_buff *skb, **frag;
- int err, hlen, count, sent=0;
- l2cap_hdr *lh;
- BT_DBG("sk %p len %d", sk, len);
- /* First fragment (with L2CAP header) */
- if (sk->type == SOCK_DGRAM)
- hlen = L2CAP_HDR_SIZE + 2;
- else
- hlen = L2CAP_HDR_SIZE;
- count = MIN(conn->mtu - hlen, len);
- skb = bluez_skb_send_alloc(sk, hlen + count,
- msg->msg_flags & MSG_DONTWAIT, &err);
- if (!skb)
- return err;
- /* Create L2CAP header */
- lh = (l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
- lh->cid = __cpu_to_le16(l2cap_pi(sk)->dcid);
- lh->len = __cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
- if (sk->type == SOCK_DGRAM)
- put_unaligned(l2cap_pi(sk)->psm, (__u16 *) skb_put(skb, 2));
- if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
- err = -EFAULT;
- goto fail;
- }
- sent += count;
- len -= count;
- /* Continuation fragments (no L2CAP header) */
- frag = &skb_shinfo(skb)->frag_list;
- while (len) {
- count = MIN(conn->mtu, len);
- *frag = bluez_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
- if (!*frag)
- goto fail;
-
- if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) {
- err = -EFAULT;
- goto fail;
- }
- sent += count;
- len -= count;
- frag = &(*frag)->next;
- }
- if ((err = hci_send_acl(conn->hcon, skb, 0)) < 0)
- goto fail;
- return sent;
- fail:
- kfree_skb(skb);
- return err;
- }
- /* --------- L2CAP signalling commands --------- */
- static inline __u8 l2cap_get_ident(struct l2cap_conn *conn)
- {
- __u8 id;
- /* Get next available identificator.
- * 1 - 199 are used by kernel.
- * 200 - 254 are used by utilities like l2ping, etc
- */
- spin_lock(&conn->lock);
- if (++conn->tx_ident > 199)
- conn->tx_ident = 1;
- id = conn->tx_ident;
- spin_unlock(&conn->lock);
- return id;
- }
- static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
- __u8 code, __u8 ident, __u16 dlen, void *data)
- {
- struct sk_buff *skb, **frag;
- l2cap_cmd_hdr *cmd;
- l2cap_hdr *lh;
- int len, count;
- BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", conn, code, ident, dlen);
- len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
- count = MIN(conn->mtu, len);
-
- skb = bluez_skb_alloc(count, GFP_ATOMIC);
- if (!skb)
- return NULL;
- lh = (l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
- lh->len = __cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
- lh->cid = __cpu_to_le16(0x0001);
- cmd = (l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
- cmd->code = code;
- cmd->ident = ident;
- cmd->len = __cpu_to_le16(dlen);
- if (dlen) {
- count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
- memcpy(skb_put(skb, count), data, count);
- data += count;
- }
- len -= skb->len;
-
- /* Continuation fragments (no L2CAP header) */
- frag = &skb_shinfo(skb)->frag_list;
- while (len) {
- count = MIN(conn->mtu, len);
- *frag = bluez_skb_alloc(count, GFP_ATOMIC);
- if (!*frag)
- goto fail;
-
- memcpy(skb_put(*frag, count), data, count);
- len -= count;
- data += count;
-
- frag = &(*frag)->next;
- }
- return skb;
- fail:
- kfree_skb(skb);
- return NULL;
- }
- static int l2cap_send_req(struct l2cap_conn *conn, __u8 code, __u16 len, void *data)
- {
- __u8 ident = l2cap_get_ident(conn);
- struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
- BT_DBG("code 0x%2.2x", code);
- if (!skb)
- return -ENOMEM;
- return hci_send_acl(conn->hcon, skb, 0);
- }
- static int l2cap_send_rsp(struct l2cap_conn *conn, __u8 ident, __u8 code, __u16 len, void *data)
- {
- struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
- BT_DBG("code 0x%2.2x", code);
- if (!skb)
- return -ENOMEM;
- return hci_send_acl(conn->hcon, skb, 0);
- }
- static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
- {
- l2cap_conf_opt *opt = *ptr;
- int len;
- len = L2CAP_CONF_OPT_SIZE + opt->len;
- *ptr += len;
- *type = opt->type;
- *olen = opt->len;
- switch (opt->len) {
- case 1:
- *val = *((__u8 *) opt->val);
- break;
- case 2:
- *val = __le16_to_cpu(*((__u16 *)opt->val));
- break;
- case 4:
- *val = __le32_to_cpu(*((__u32 *)opt->val));
- break;
- default:
- *val = (unsigned long) opt->val;
- break;
- };
- BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
- return len;
- }
- static inline void l2cap_parse_conf_req(struct sock *sk, void *data, int len)
- {
- int type, hint, olen;
- unsigned long val;
- void *ptr = data;
- BT_DBG("sk %p len %d", sk, len);
- while (len >= L2CAP_CONF_OPT_SIZE) {
- len -= l2cap_get_conf_opt(&ptr, &type, &olen, &val);
- hint = type & 0x80;
- type &= 0x7f;
- switch (type) {
- case L2CAP_CONF_MTU:
- l2cap_pi(sk)->conf_mtu = val;
- break;
- case L2CAP_CONF_FLUSH_TO:
- l2cap_pi(sk)->flush_to = val;
- break;
- case L2CAP_CONF_QOS:
- break;
-
- default:
- if (hint)
- break;
- /* FIXME: Reject unknown option */
- break;
- };
- }
- }
- static void l2cap_add_conf_opt(void **ptr, __u8 type, __u8 len, unsigned long val)
- {
- register l2cap_conf_opt *opt = *ptr;
- BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
- opt->type = type;
- opt->len = len;
- switch (len) {
- case 1:
- *((__u8 *) opt->val) = val;
- break;
- case 2:
- *((__u16 *) opt->val) = __cpu_to_le16(val);
- break;
- case 4:
- *((__u32 *) opt->val) = __cpu_to_le32(val);
- break;
- default:
- memcpy(opt->val, (void *) val, len);
- break;
- };
- *ptr += L2CAP_CONF_OPT_SIZE + len;
- }
- static int l2cap_build_conf_req(struct sock *sk, void *data)
- {
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- l2cap_conf_req *req = (l2cap_conf_req *) data;
- void *ptr = req->data;
- BT_DBG("sk %p", sk);
- if (pi->imtu != L2CAP_DEFAULT_MTU)
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
- /* FIXME. Need actual value of the flush timeout */
- //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
- // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
- req->dcid = __cpu_to_le16(pi->dcid);
- req->flags = __cpu_to_le16(0);
- return ptr - data;
- }
- static inline int l2cap_conf_output(struct sock *sk, void **ptr)
- {
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- int result = 0;
- /* Configure output options and let the other side know
- * which ones we don't like.
- */
- if (pi->conf_mtu < pi->omtu) {
- l2cap_add_conf_opt(ptr, L2CAP_CONF_MTU, 2, pi->omtu);
- result = L2CAP_CONF_UNACCEPT;
- } else {
- pi->omtu = pi->conf_mtu;
- }
- BT_DBG("sk %p result %d", sk, result);
- return result;
- }
- static int l2cap_build_conf_rsp(struct sock *sk, void *data, int *result)
- {
- l2cap_conf_rsp *rsp = (l2cap_conf_rsp *) data;
- void *ptr = rsp->data;
- BT_DBG("sk %p complete %d", sk, result ? 1 : 0);
- if (result)
- *result = l2cap_conf_output(sk, &ptr);
- rsp->scid = __cpu_to_le16(l2cap_pi(sk)->dcid);
- rsp->result = __cpu_to_le16(result ? *result : 0);
- rsp->flags = __cpu_to_le16(0);
- return ptr - data;
- }
- static inline int l2cap_connect_req(struct l2cap_conn *conn, l2cap_cmd_hdr *cmd, __u8 *data)
- {
- struct l2cap_chan_list *list = &conn->chan_list;
- l2cap_conn_req *req = (l2cap_conn_req *) data;
- l2cap_conn_rsp rsp;
- struct sock *sk, *parent;
- int result = 0, status = 0;
- __u16 dcid = 0, scid = __le16_to_cpu(req->scid);
- __u16 psm = req->psm;
- BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
- /* Check if we have socket listening on psm */
- parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
- if (!parent) {
- result = L2CAP_CR_BAD_PSM;
- goto sendresp;
- }
- result = L2CAP_CR_NO_MEM;
- /* Check for backlog size */
- if (parent->ack_backlog > parent->max_ack_backlog) {
- BT_DBG("backlog full %d", parent->ack_backlog);
- goto response;
- }
- sk = l2cap_sock_alloc(NULL, BTPROTO_L2CAP, GFP_ATOMIC);
- if (!sk)
- goto response;
- write_lock(&list->lock);
- /* Check if we already have channel with that dcid */
- if (__l2cap_get_chan_by_dcid(list, scid)) {
- write_unlock(&list->lock);
- sk->zapped = 1;
- l2cap_sock_kill(sk);
- goto response;
- }
- hci_conn_hold(conn->hcon);
- l2cap_sock_init(sk, parent);
- bacpy(&bluez_pi(sk)->src, conn->src);
- bacpy(&bluez_pi(sk)->dst, conn->dst);
- l2cap_pi(sk)->psm = psm;
- l2cap_pi(sk)->dcid = scid;
- __l2cap_chan_add(conn, sk, parent);
- dcid = l2cap_pi(sk)->scid;
- l2cap_sock_set_timer(sk, sk->sndtimeo);
- /* Service level security */
- result = L2CAP_CR_PEND;
- status = L2CAP_CS_AUTHEN_PEND;
- sk->state = BT_CONNECT2;
- l2cap_pi(sk)->ident = cmd->ident;
-
- if (l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT) {
- if (!hci_conn_encrypt(conn->hcon))
- goto done;
- } else if (l2cap_pi(sk)->link_mode & L2CAP_LM_AUTH) {
- if (!hci_conn_auth(conn->hcon))
- goto done;
- }
- sk->state = BT_CONFIG;
- result = status = 0;
- done:
- write_unlock(&list->lock);
- response:
- bh_unlock_sock(parent);
- sendresp:
- rsp.scid = __cpu_to_le16(scid);
- rsp.dcid = __cpu_to_le16(dcid);
- rsp.result = __cpu_to_le16(result);
- rsp.status = __cpu_to_le16(status);
- l2cap_send_rsp(conn, cmd->ident, L2CAP_CONN_RSP, L2CAP_CONN_RSP_SIZE, &rsp);
- return 0;
- }
- static inline int l2cap_connect_rsp(struct l2cap_conn *conn, l2cap_cmd_hdr *cmd, __u8 *data)
- {
- l2cap_conn_rsp *rsp = (l2cap_conn_rsp *) data;
- __u16 scid, dcid, result, status;
- struct sock *sk;
- char req[128];
- scid = __le16_to_cpu(rsp->scid);
- dcid = __le16_to_cpu(rsp->dcid);
- result = __le16_to_cpu(rsp->result);
- status = __le16_to_cpu(rsp->status);
- BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
- if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
- return -ENOENT;
- switch (result) {
- case L2CAP_CR_SUCCESS:
- sk->state = BT_CONFIG;
- l2cap_pi(sk)->dcid = dcid;
- l2cap_pi(sk)->conf_state |= CONF_REQ_SENT;
- l2cap_send_req(conn, L2CAP_CONF_REQ, l2cap_build_conf_req(sk, req), req);
- break;
- case L2CAP_CR_PEND:
- break;
- default:
- l2cap_chan_del(sk, ECONNREFUSED);
- break;
- }
- bh_unlock_sock(sk);
- return 0;
- }
- static inline int l2cap_config_req(struct l2cap_conn *conn, l2cap_cmd_hdr *cmd, __u8 *data)
- {
- l2cap_conf_req * req = (l2cap_conf_req *) data;
- __u16 dcid, flags;
- __u8 rsp[64];
- struct sock *sk;
- int result;
- dcid = __le16_to_cpu(req->dcid);
- flags = __le16_to_cpu(req->flags);
- BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
- if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid)))
- return -ENOENT;
- l2cap_parse_conf_req(sk, req->data, cmd->len - L2CAP_CONF_REQ_SIZE);
- if (flags & 0x01) {
- /* Incomplete config. Send empty response. */
- l2cap_send_rsp(conn, cmd->ident, L2CAP_CONF_RSP, l2cap_build_conf_rsp(sk, rsp, NULL), rsp);
- goto unlock;
- }
- /* Complete config. */
- l2cap_send_rsp(conn, cmd->ident, L2CAP_CONF_RSP, l2cap_build_conf_rsp(sk, rsp, &result), rsp);
- if (result)
- goto unlock;
- /* Output config done */
- l2cap_pi(sk)->conf_state |= CONF_OUTPUT_DONE;
- if (l2cap_pi(sk)->conf_state & CONF_INPUT_DONE) {
- sk->state = BT_CONNECTED;
- l2cap_chan_ready(sk);
- } else if (!(l2cap_pi(sk)->conf_state & CONF_REQ_SENT)) {
- char req[64];
- l2cap_send_req(conn, L2CAP_CONF_REQ, l2cap_build_conf_req(sk, req), req);
- }
- unlock:
- bh_unlock_sock(sk);
- return 0;
- }
- static inline int l2cap_config_rsp(struct l2cap_conn *conn, l2cap_cmd_hdr *cmd, __u8 *data)
- {
- l2cap_conf_rsp *rsp = (l2cap_conf_rsp *)data;
- __u16 scid, flags, result;
- struct sock *sk;
- int err = 0;
- scid = __le16_to_cpu(rsp->scid);
- flags = __le16_to_cpu(rsp->flags);
- result = __le16_to_cpu(rsp->result);
- BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", scid, flags, result);
- if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
- return -ENOENT;
- if (result) {
- l2cap_disconn_req req;
- /* They didn't like our options. Well... we do not negotiate.
- * Close channel.
- */
- sk->state = BT_DISCONN;
- l2cap_sock_set_timer(sk, HZ * 5);
- req.dcid = __cpu_to_le16(l2cap_pi(sk)->dcid);
- req.scid = __cpu_to_le16(l2cap_pi(sk)->scid);
- l2cap_send_req(conn, L2CAP_DISCONN_REQ, L2CAP_DISCONN_REQ_SIZE, &req);
- goto done;
- }
- if (flags & 0x01)
- goto done;
- /* Input config done */
- l2cap_pi(sk)->conf_state |= CONF_INPUT_DONE;
- if (l2cap_pi(sk)->conf_state & CONF_OUTPUT_DONE) {
- sk->state = BT_CONNECTED;
- l2cap_chan_ready(sk);
- }
- done:
- bh_unlock_sock(sk);
- return err;
- }
- static inline int l2cap_disconnect_req(struct l2cap_conn *conn, l2cap_cmd_hdr *cmd, __u8 *data)
- {
- l2cap_disconn_req *req = (l2cap_disconn_req *) data;
- l2cap_disconn_rsp rsp;
- __u16 dcid, scid;
- struct sock *sk;
- scid = __le16_to_cpu(req->scid);
- dcid = __le16_to_cpu(req->dcid);
- BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
- if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid)))
- return 0;
- rsp.dcid = __cpu_to_le16(l2cap_pi(sk)->scid);
- rsp.scid = __cpu_to_le16(l2cap_pi(sk)->dcid);
- l2cap_send_rsp(conn, cmd->ident, L2CAP_DISCONN_RSP, L2CAP_DISCONN_RSP_SIZE, &rsp);
- sk->shutdown = SHUTDOWN_MASK;
-
- l2cap_chan_del(sk, ECONNRESET);
- bh_unlock_sock(sk);
- l2cap_sock_kill(sk);
- return 0;
- }
- static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, l2cap_cmd_hdr *cmd, __u8 *data)
- {
- l2cap_disconn_rsp *rsp = (l2cap_disconn_rsp *) data;
- __u16 dcid, scid;
- struct sock *sk;
- scid = __le16_to_cpu(rsp->scid);
- dcid = __le16_to_cpu(rsp->dcid);
- BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
- if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
- return 0;
- l2cap_chan_del(sk, ECONNABORTED);
- bh_unlock_sock(sk);
- l2cap_sock_kill(sk);
- return 0;
- }
- static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
- {
- __u8 *data = skb->data;
- int len = skb->len;
- l2cap_cmd_hdr cmd;
- int err = 0;
- while (len >= L2CAP_CMD_HDR_SIZE) {
- memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
- data += L2CAP_CMD_HDR_SIZE;
- len -= L2CAP_CMD_HDR_SIZE;
- cmd.len = __le16_to_cpu(cmd.len);
- BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd.len, cmd.ident);
- if (cmd.len > len || !cmd.ident) {
- BT_DBG("corrupted command");
- break;
- }
- switch (cmd.code) {
- case L2CAP_CONN_REQ:
- err = l2cap_connect_req(conn, &cmd, data);
- break;
- case L2CAP_CONN_RSP:
- err = l2cap_connect_rsp(conn, &cmd, data);
- break;
- case L2CAP_CONF_REQ:
- err = l2cap_config_req(conn, &cmd, data);
- break;
- case L2CAP_CONF_RSP:
- err = l2cap_config_rsp(conn, &cmd, data);
- break;
- case L2CAP_DISCONN_REQ:
- err = l2cap_disconnect_req(conn, &cmd, data);
- break;
- case L2CAP_DISCONN_RSP:
- err = l2cap_disconnect_rsp(conn, &cmd, data);
- break;
- case L2CAP_COMMAND_REJ:
- /* FIXME: We should process this */
- l2cap_raw_recv(conn, skb);
- break;
- case L2CAP_ECHO_REQ:
- l2cap_send_rsp(conn, cmd.ident, L2CAP_ECHO_RSP, cmd.len, data);
- break;
- case L2CAP_ECHO_RSP:
- case L2CAP_INFO_REQ:
- case L2CAP_INFO_RSP:
- l2cap_raw_recv(conn, skb);
- break;
- default:
- BT_ERR("Uknown signaling command 0x%2.2x", cmd.code);
- err = -EINVAL;
- break;
- };
- if (err) {
- l2cap_cmd_rej rej;
- BT_DBG("error %d", err);
- /* FIXME: Map err to a valid reason. */
- rej.reason = __cpu_to_le16(0);
- l2cap_send_rsp(conn, cmd.ident, L2CAP_COMMAND_REJ, L2CAP_CMD_REJ_SIZE, &rej);
- }
- data += cmd.len;
- len -= cmd.len;
- }
- kfree_skb(skb);
- }
- static inline int l2cap_data_channel(struct l2cap_conn *conn, __u16 cid, struct sk_buff *skb)
- {
- struct sock *sk;
- sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
- if (!sk) {
- BT_DBG("unknown cid 0x%4.4x", cid);
- goto drop;
- }
- BT_DBG("sk %p, len %d", sk, skb->len);
- if (sk->state != BT_CONNECTED)
- goto drop;
- if (l2cap_pi(sk)->imtu < skb->len)
- goto drop;
- /* If socket recv buffers overflows we drop data here
- * which is *bad* because L2CAP has to be reliable.
- * But we don't have any other choice. L2CAP doesn't
- * provide flow control mechanism */
-
- if (!sock_queue_rcv_skb(sk, skb))
- goto done;
- drop:
- kfree_skb(skb);
- done:
- if (sk) bh_unlock_sock(sk);
- return 0;
- }
- static inline int l2cap_conless_channel(struct l2cap_conn *conn, __u16 psm, struct sk_buff *skb)
- {
- struct sock *sk;
- sk = l2cap_get_sock_by_psm(0, psm, conn->src);
- if (!sk)
- goto drop;
- BT_DBG("sk %p, len %d", sk, skb->len);
- if (sk->state != BT_BOUND && sk->state != BT_CONNECTED)
- goto drop;
- if (l2cap_pi(sk)->imtu < skb->len)
- goto drop;
- if (!sock_queue_rcv_skb(sk, skb))
- goto done;
- drop:
- kfree_skb(skb);
- done:
- if (sk) bh_unlock_sock(sk);
- return 0;
- }
- static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
- {
- l2cap_hdr *lh = (l2cap_hdr *) skb->data;
- __u16 cid, psm, len;
- skb_pull(skb, L2CAP_HDR_SIZE);
- cid = __le16_to_cpu(lh->cid);
- len = __le16_to_cpu(lh->len);
- BT_DBG("len %d, cid 0x%4.4x", len, cid);
- switch (cid) {
- case 0x0001:
- l2cap_sig_channel(conn, skb);
- break;
- case 0x0002:
- psm = get_unaligned((__u16 *) skb->data);
- skb_pull(skb, 2);
- l2cap_conless_channel(conn, psm, skb);
- break;
-
- default:
- l2cap_data_channel(conn, cid, skb);
- break;
- }
- }
- /* ------------ L2CAP interface with lower layer (HCI) ------------- */
- static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
- {
- int exact = 0, lm1 = 0, lm2 = 0;
- register struct sock *sk;
- if (type != ACL_LINK)
- return 0;
- BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
- /* Find listening sockets and check their link_mode */
- read_lock(&l2cap_sk_list.lock);
- for (sk = l2cap_sk_list.head; sk; sk = sk->next) {
- if (sk->state != BT_LISTEN)
- continue;
- if (!bacmp(&bluez_pi(sk)->src, bdaddr)) {
- lm1 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode);
- exact++;
- } else if (!bacmp(&bluez_pi(sk)->src, BDADDR_ANY))
- lm2 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode);
- }
- read_unlock(&l2cap_sk_list.lock);
- return exact ? lm1 : lm2;
- }
- static int l2cap_connect_cfm(struct hci_conn *hcon, __u8 status)
- {
- BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
- if (hcon->type != ACL_LINK)
- return 0;
- if (!status) {
- struct l2cap_conn *conn;
- conn = l2cap_conn_add(hcon, status);
- if (conn)
- l2cap_conn_ready(conn);
- } else
- l2cap_conn_del(hcon, bterr(status));
-
- return 0;
- }
- static int l2cap_disconn_ind(struct hci_conn *hcon, __u8 reason)
- {
- BT_DBG("hcon %p reason %d", hcon, reason);
- if (hcon->type != ACL_LINK)
- return 0;
- l2cap_conn_del(hcon, bterr(reason));
- return 0;
- }
- static int l2cap_auth_cfm(struct hci_conn *hcon, __u8 status)
- {
- struct l2cap_chan_list *l;
- struct l2cap_conn *conn;
- l2cap_conn_rsp rsp;
- struct sock *sk;
- int result;
-
- if (!(conn = hcon->l2cap_data))
- return 0;
- l = &conn->chan_list;
- BT_DBG("conn %p", conn);
- read_lock(&l->lock);
- for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
- bh_lock_sock(sk);
- if (sk->state != BT_CONNECT2 ||
- (l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT)) {
- bh_unlock_sock(sk);
- continue;
- }
- if (!status) {
- sk->state = BT_CONFIG;
- result = 0;
- } else {
- sk->state = BT_DISCONN;
- l2cap_sock_set_timer(sk, HZ/10);
- result = L2CAP_CR_SEC_BLOCK;
- }
- 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(0);
- l2cap_send_rsp(conn, l2cap_pi(sk)->ident, L2CAP_CONN_RSP,
- L2CAP_CONN_RSP_SIZE, &rsp);
- bh_unlock_sock(sk);
- }
- read_unlock(&l->lock);
- return 0;
- }
- static int l2cap_encrypt_cfm(struct hci_conn *hcon, __u8 status)
- {
- struct l2cap_chan_list *l;
- struct l2cap_conn *conn;
- l2cap_conn_rsp rsp;
- struct sock *sk;
- int result;
-
- if (!(conn = hcon->l2cap_data))
- return 0;
- l = &conn->chan_list;
- BT_DBG("conn %p", conn);
- read_lock(&l->lock);
- for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
- bh_lock_sock(sk);
- if (sk->state != BT_CONNECT2) {
- bh_unlock_sock(sk);
- continue;
- }
- if (!status) {
- sk->state = BT_CONFIG;
- result = 0;
- } else {
- sk->state = BT_DISCONN;
- l2cap_sock_set_timer(sk, HZ/10);
- result = L2CAP_CR_SEC_BLOCK;
- }
- 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(0);
- l2cap_send_rsp(conn, l2cap_pi(sk)->ident, L2CAP_CONN_RSP,
- L2CAP_CONN_RSP_SIZE, &rsp);
- bh_unlock_sock(sk);
- }
- read_unlock(&l->lock);
- return 0;
- }
- static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, __u16 flags)
- {
- struct l2cap_conn *conn = hcon->l2cap_data;
- if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
- goto drop;
- BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
- if (flags & ACL_START) {
- l2cap_hdr *hdr;
- int len;
- if (conn->rx_len) {
- BT_ERR("Unexpected start frame (len %d)", skb->len);
- kfree_skb(conn->rx_skb);
- conn->rx_skb = NULL;
- conn->rx_len = 0;
- }
- if (skb->len < 2) {
- BT_ERR("Frame is too small (len %d)", skb->len);
- goto drop;
- }
- hdr = (l2cap_hdr *) skb->data;
- len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
- BT_DBG("Start: total len %d, frag len %d", len, skb->len);
- if (len == skb->len) {
- /* Complete frame received */
- l2cap_recv_frame(conn, skb);
- return 0;
- }
- /* Allocate skb for the complete frame (with header) */
- if (!(conn->rx_skb = bluez_skb_alloc(len, GFP_ATOMIC)))
- goto drop;
- memcpy(skb_put(conn->rx_skb, skb->len), skb->data, skb->len);
- conn->rx_len = len - skb->len;
- } else {
- BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
- if (!conn->rx_len) {
- BT_ERR("Unexpected continuation frame (len %d)", skb->len);
- goto drop;
- }
- if (skb->len > conn->rx_len) {
- BT_ERR("Fragment is too large (len %d, expect %d)",
- skb->len, conn->rx_len);
- kfree_skb(conn->rx_skb);
- conn->rx_skb = NULL;
- conn->rx_len = 0;
- goto drop;
- }
- memcpy(skb_put(conn->rx_skb, skb->len), skb->data, skb->len);
- conn->rx_len -= skb->len;
- if (!conn->rx_len) {
- /* Complete frame received */
- l2cap_recv_frame(conn, conn->rx_skb);
- conn->rx_skb = NULL;
- }
- }
- drop:
- kfree_skb(skb);
- return 0;
- }
- /* ----- Proc fs support ------ */
- static int l2cap_sock_dump(char *buf, struct bluez_sock_list *list)
- {
- struct l2cap_pinfo *pi;
- struct sock *sk;
- char *ptr = buf;
- read_lock_bh(&list->lock);
- for (sk = list->head; sk; sk = sk->next) {
- pi = l2cap_pi(sk);
- ptr += sprintf(ptr, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d 0x%xn",
- batostr(&bluez_pi(sk)->src), batostr(&bluez_pi(sk)->dst),
- sk->state, pi->psm, pi->scid, pi->dcid, pi->imtu, pi->omtu,
- pi->link_mode);
- }
- read_unlock_bh(&list->lock);
- ptr += sprintf(ptr, "n");
- return ptr - buf;
- }
- static int l2cap_read_proc(char *buf, char **start, off_t offset, int count, int *eof, void *priv)
- {
- char *ptr = buf;
- int len;
- BT_DBG("count %d, offset %ld", count, offset);
- ptr += l2cap_sock_dump(ptr, &l2cap_sk_list);
- len = ptr - buf;
- if (len <= count + offset)
- *eof = 1;
- *start = buf + offset;
- len -= offset;
- if (len > count)
- len = count;
- if (len < 0)
- len = 0;
- return len;
- }
- static struct proto_ops l2cap_sock_ops = {
- family: PF_BLUETOOTH,
- 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: bluez_sock_recvmsg,
- poll: bluez_sock_poll,
- socketpair: sock_no_socketpair,
- ioctl: sock_no_ioctl,
- shutdown: l2cap_sock_shutdown,
- setsockopt: l2cap_sock_setsockopt,
- getsockopt: l2cap_sock_getsockopt,
- mmap: sock_no_mmap
- };
- static struct net_proto_family l2cap_sock_family_ops = {
- family: PF_BLUETOOTH,
- create: l2cap_sock_create
- };
- static struct hci_proto l2cap_hci_proto = {
- name: "L2CAP",
- id: HCI_PROTO_L2CAP,
- connect_ind: l2cap_connect_ind,
- connect_cfm: l2cap_connect_cfm,
- disconn_ind: l2cap_disconn_ind,
- recv_acldata: l2cap_recv_acldata,
- auth_cfm: l2cap_auth_cfm,
- encrypt_cfm: l2cap_encrypt_cfm
- };
- int __init l2cap_init(void)
- {
- int err;
- if ((err = bluez_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops))) {
- BT_ERR("Can't register L2CAP socket");
- return err;
- }
- if ((err = hci_register_proto(&l2cap_hci_proto))) {
- BT_ERR("Can't register L2CAP protocol");
- return err;
- }
- create_proc_read_entry("bluetooth/l2cap", 0, 0, l2cap_read_proc, NULL);
- BT_INFO("BlueZ L2CAP ver %s Copyright (C) 2000,2001 Qualcomm Inc", VERSION);
- BT_INFO("Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>");
- return 0;
- }
- void l2cap_cleanup(void)
- {
- remove_proc_entry("bluetooth/l2cap", NULL);
- /* Unregister socket and protocol */
- if (bluez_sock_unregister(BTPROTO_L2CAP))
- BT_ERR("Can't unregister L2CAP socket");
- if (hci_unregister_proto(&l2cap_hci_proto))
- BT_ERR("Can't unregister L2CAP protocol");
- }
- module_init(l2cap_init);
- module_exit(l2cap_cleanup);
- MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>");
- MODULE_DESCRIPTION("BlueZ L2CAP ver " VERSION);
- MODULE_LICENSE("GPL");