patch-2.4.19 linux-2.4.19/net/bluetooth/l2cap.c
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- Lines: 2051
- Date:
Fri Aug 2 17:39:46 2002
- Orig file:
linux-2.4.18/net/bluetooth/l2cap.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.18/net/bluetooth/l2cap.c linux-2.4.19/net/bluetooth/l2cap.c
@@ -0,0 +1,2050 @@
+/*
+ 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 1.8 2002/04/19 00:01:39 maxk Exp $
+ */
+#define VERSION "2.0"
+
+#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 <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(struct sockaddr_l2 *addr)
+{
+ bdaddr_t *src = &addr->l2_bdaddr;
+ __u16 psm = addr->l2_psm;
+ 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 listening on psm and source bdaddr.
+ * Returns closest match.
+ */
+static struct sock *l2cap_get_sock_listen(bdaddr_t *src, __u16 psm)
+{
+ struct sock *sk, *sk1 = NULL;
+
+ read_lock(&l2cap_sk_list.lock);
+
+ for (sk = l2cap_sk_list.head; sk; sk = sk->next) {
+ if (sk->state != BT_LISTEN)
+ 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;
+ }
+ }
+
+ read_unlock(&l2cap_sk_list.lock);
+ return sk ? sk : sk1;
+}
+
+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:
+ 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_CONNECT2:
+ 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_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(&l2cap_sk_list.lock);
+
+ if (la->l2_psm && __l2cap_get_sock_by_addr(la)) {
+ err = -EADDRINUSE;
+ goto unlock;
+ }
+
+ /* Save source address */
+ bacpy(&bluez_pi(sk)->src, &la->l2_bdaddr);
+ l2cap_pi(sk)->psm = la->l2_psm;
+ sk->state = BT_BOUND;
+
+unlock:
+ write_unlock(&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;
+
+ 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_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 normal socket */
+ l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
+ } else {
+ /* Raw socket can send only signalling messages */
+ 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, size, count, sent=0;
+ l2cap_hdr *lh;
+
+ /* Check outgoing MTU */
+ if (len > l2cap_pi(sk)->omtu)
+ return -EINVAL;
+
+ BT_DBG("sk %p len %d", sk, len);
+
+ /* First fragment (with L2CAP header) */
+ count = MIN(conn->mtu - L2CAP_HDR_SIZE, len);
+ size = L2CAP_HDR_SIZE + count;
+ if (!(skb = bluez_skb_send_alloc(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)))
+ return err;
+
+ /* Create L2CAP header */
+ lh = (l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+ lh->len = __cpu_to_le16(len);
+ lh->cid = __cpu_to_le16(l2cap_pi(sk)->dcid);
+
+ 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 */
+ if (!(parent = l2cap_get_sock_listen(conn->src, psm))) {
+ result = L2CAP_CR_BAD_PSM;
+ goto resp;
+ }
+
+ write_lock(&list->lock);
+ bh_lock_sock(parent);
+
+ result = L2CAP_CR_NO_MEM;
+
+ /* Check if we already have channel with that dcid */
+ if (__l2cap_get_chan_by_dcid(list, scid))
+ goto unlock;
+
+ /* Check for backlog size */
+ if (parent->ack_backlog > parent->max_ack_backlog) {
+ BT_DBG("backlog full %d", parent->ack_backlog);
+ goto unlock;
+ }
+
+ if (!(sk = l2cap_sock_alloc(NULL, BTPROTO_L2CAP, GFP_ATOMIC)))
+ goto unlock;
+
+ 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;
+
+ hci_conn_hold(conn->hcon);
+
+ __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 unlock;
+ } else if (l2cap_pi(sk)->link_mode & L2CAP_LM_AUTH) {
+ if (!hci_conn_auth(conn->hcon))
+ goto unlock;
+ }
+
+ sk->state = BT_CONFIG;
+ result = status = 0;
+
+unlock:
+ bh_unlock_sock(parent);
+ write_unlock(&list->lock);
+
+resp:
+ 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 void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
+{
+ l2cap_hdr *lh = (l2cap_hdr *) skb->data;
+ __u16 cid, 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);
+
+ if (cid == 0x0001)
+ l2cap_sig_channel(conn, skb);
+ else
+ l2cap_data_channel(conn, cid, skb);
+}
+
+/* ------------ 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) {
+ int flen, tlen, size;
+ l2cap_hdr *lh;
+
+ 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 < L2CAP_HDR_SIZE) {
+ BT_ERR("Frame is too small (len %d)", skb->len);
+ goto drop;
+ }
+
+ lh = (l2cap_hdr *)skb->data;
+ tlen = __le16_to_cpu(lh->len);
+ flen = skb->len - L2CAP_HDR_SIZE;
+
+ BT_DBG("Start: total len %d, frag len %d", tlen, flen);
+
+ if (flen == tlen) {
+ /* Complete frame received */
+ l2cap_recv_frame(conn, skb);
+ return 0;
+ }
+
+ /* Allocate skb for the complete frame (with header) */
+ size = L2CAP_HDR_SIZE + tlen;
+ if (!(conn->rx_skb = bluez_skb_alloc(size, GFP_ATOMIC)))
+ goto drop;
+
+ memcpy(skb_put(conn->rx_skb, skb->len), skb->data, skb->len);
+ conn->rx_len = tlen - flen;
+ } 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;
+
+ write_lock(&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%x\n",
+ 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);
+ }
+
+ write_unlock(&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: sock_no_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");
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)