10a708f8fSGustavo F. Padovan /* 20a708f8fSGustavo F. Padovan BlueZ - Bluetooth protocol stack for Linux 30a708f8fSGustavo F. Padovan Copyright (C) 2000-2001 Qualcomm Incorporated 40a708f8fSGustavo F. Padovan Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> 50a708f8fSGustavo F. Padovan Copyright (C) 2010 Google Inc. 60a708f8fSGustavo F. Padovan 70a708f8fSGustavo F. Padovan Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 80a708f8fSGustavo F. Padovan 90a708f8fSGustavo F. Padovan This program is free software; you can redistribute it and/or modify 100a708f8fSGustavo F. Padovan it under the terms of the GNU General Public License version 2 as 110a708f8fSGustavo F. Padovan published by the Free Software Foundation; 120a708f8fSGustavo F. Padovan 130a708f8fSGustavo F. Padovan THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 140a708f8fSGustavo F. Padovan OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 150a708f8fSGustavo F. Padovan FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 160a708f8fSGustavo F. Padovan IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 170a708f8fSGustavo F. Padovan CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 180a708f8fSGustavo F. Padovan WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 190a708f8fSGustavo F. Padovan ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 200a708f8fSGustavo F. Padovan OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 210a708f8fSGustavo F. Padovan 220a708f8fSGustavo F. Padovan ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 230a708f8fSGustavo F. Padovan COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 240a708f8fSGustavo F. Padovan SOFTWARE IS DISCLAIMED. 250a708f8fSGustavo F. Padovan */ 260a708f8fSGustavo F. Padovan 27bb58f747SGustavo F. Padovan /* Bluetooth L2CAP core. */ 280a708f8fSGustavo F. Padovan 290a708f8fSGustavo F. Padovan #include <linux/module.h> 300a708f8fSGustavo F. Padovan 310a708f8fSGustavo F. Padovan #include <linux/types.h> 320a708f8fSGustavo F. Padovan #include <linux/capability.h> 330a708f8fSGustavo F. Padovan #include <linux/errno.h> 340a708f8fSGustavo F. Padovan #include <linux/kernel.h> 350a708f8fSGustavo F. Padovan #include <linux/sched.h> 360a708f8fSGustavo F. Padovan #include <linux/slab.h> 370a708f8fSGustavo F. Padovan #include <linux/poll.h> 380a708f8fSGustavo F. Padovan #include <linux/fcntl.h> 390a708f8fSGustavo F. Padovan #include <linux/init.h> 400a708f8fSGustavo F. Padovan #include <linux/interrupt.h> 410a708f8fSGustavo F. Padovan #include <linux/socket.h> 420a708f8fSGustavo F. Padovan #include <linux/skbuff.h> 430a708f8fSGustavo F. Padovan #include <linux/list.h> 440a708f8fSGustavo F. Padovan #include <linux/device.h> 450a708f8fSGustavo F. Padovan #include <linux/debugfs.h> 460a708f8fSGustavo F. Padovan #include <linux/seq_file.h> 470a708f8fSGustavo F. Padovan #include <linux/uaccess.h> 480a708f8fSGustavo F. Padovan #include <linux/crc16.h> 490a708f8fSGustavo F. Padovan #include <net/sock.h> 500a708f8fSGustavo F. Padovan 510a708f8fSGustavo F. Padovan #include <asm/system.h> 520a708f8fSGustavo F. Padovan #include <asm/unaligned.h> 530a708f8fSGustavo F. Padovan 540a708f8fSGustavo F. Padovan #include <net/bluetooth/bluetooth.h> 550a708f8fSGustavo F. Padovan #include <net/bluetooth/hci_core.h> 560a708f8fSGustavo F. Padovan #include <net/bluetooth/l2cap.h> 570a708f8fSGustavo F. Padovan 58bb58f747SGustavo F. Padovan int disable_ertm; 590a708f8fSGustavo F. Padovan 600a708f8fSGustavo F. Padovan static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; 610a708f8fSGustavo F. Padovan static u8 l2cap_fixed_chan[8] = { 0x02, }; 620a708f8fSGustavo F. Padovan 630a708f8fSGustavo F. Padovan static struct workqueue_struct *_busy_wq; 640a708f8fSGustavo F. Padovan 65b5ad8b7fSJohannes Berg static LIST_HEAD(chan_list); 66b5ad8b7fSJohannes Berg static DEFINE_RWLOCK(chan_list_lock); 670a708f8fSGustavo F. Padovan 680a708f8fSGustavo F. Padovan static void l2cap_busy_work(struct work_struct *work); 690a708f8fSGustavo F. Padovan 700a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 710a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data); 724519de9aSGustavo F. Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 734519de9aSGustavo F. Padovan void *data); 74710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); 754519de9aSGustavo F. Padovan static void l2cap_send_disconn_req(struct l2cap_conn *conn, 764519de9aSGustavo F. Padovan struct l2cap_chan *chan, int err); 770a708f8fSGustavo F. Padovan 780a708f8fSGustavo F. Padovan static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); 790a708f8fSGustavo F. Padovan 800a708f8fSGustavo F. Padovan /* ---- L2CAP channels ---- */ 8171ba0e56SGustavo F. Padovan 8271ba0e56SGustavo F. Padovan static inline void chan_hold(struct l2cap_chan *c) 8371ba0e56SGustavo F. Padovan { 8471ba0e56SGustavo F. Padovan atomic_inc(&c->refcnt); 8571ba0e56SGustavo F. Padovan } 8671ba0e56SGustavo F. Padovan 8771ba0e56SGustavo F. Padovan static inline void chan_put(struct l2cap_chan *c) 8871ba0e56SGustavo F. Padovan { 8971ba0e56SGustavo F. Padovan if (atomic_dec_and_test(&c->refcnt)) 9071ba0e56SGustavo F. Padovan kfree(c); 9171ba0e56SGustavo F. Padovan } 9271ba0e56SGustavo F. Padovan 93baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) 940a708f8fSGustavo F. Padovan { 9548454079SGustavo F. Padovan struct l2cap_chan *c; 96baa7e1faSGustavo F. Padovan 97baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 98fe4128e0SGustavo F. Padovan if (c->dcid == cid) 9948454079SGustavo F. Padovan return c; 1000a708f8fSGustavo F. Padovan } 101baa7e1faSGustavo F. Padovan return NULL; 102baa7e1faSGustavo F. Padovan 103baa7e1faSGustavo F. Padovan } 1040a708f8fSGustavo F. Padovan 105baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) 1060a708f8fSGustavo F. Padovan { 10748454079SGustavo F. Padovan struct l2cap_chan *c; 108baa7e1faSGustavo F. Padovan 109baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 110fe4128e0SGustavo F. Padovan if (c->scid == cid) 11148454079SGustavo F. Padovan return c; 1120a708f8fSGustavo F. Padovan } 113baa7e1faSGustavo F. Padovan return NULL; 114baa7e1faSGustavo F. Padovan } 1150a708f8fSGustavo F. Padovan 1160a708f8fSGustavo F. Padovan /* Find channel with given SCID. 1170a708f8fSGustavo F. Padovan * Returns locked socket */ 118baa7e1faSGustavo F. Padovan static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) 1190a708f8fSGustavo F. Padovan { 12048454079SGustavo F. Padovan struct l2cap_chan *c; 121baa7e1faSGustavo F. Padovan 122baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 123baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_scid(conn, cid); 12448454079SGustavo F. Padovan if (c) 12548454079SGustavo F. Padovan bh_lock_sock(c->sk); 126baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 12748454079SGustavo F. Padovan return c; 1280a708f8fSGustavo F. Padovan } 1290a708f8fSGustavo F. Padovan 130baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) 1310a708f8fSGustavo F. Padovan { 13248454079SGustavo F. Padovan struct l2cap_chan *c; 133baa7e1faSGustavo F. Padovan 134baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 135fc7f8a7eSGustavo F. Padovan if (c->ident == ident) 13648454079SGustavo F. Padovan return c; 1370a708f8fSGustavo F. Padovan } 138baa7e1faSGustavo F. Padovan return NULL; 139baa7e1faSGustavo F. Padovan } 1400a708f8fSGustavo F. Padovan 141baa7e1faSGustavo F. Padovan static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) 1420a708f8fSGustavo F. Padovan { 14348454079SGustavo F. Padovan struct l2cap_chan *c; 144baa7e1faSGustavo F. Padovan 145baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 146baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_ident(conn, ident); 14748454079SGustavo F. Padovan if (c) 14848454079SGustavo F. Padovan bh_lock_sock(c->sk); 149baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 15048454079SGustavo F. Padovan return c; 1510a708f8fSGustavo F. Padovan } 1520a708f8fSGustavo F. Padovan 15323691d75SGustavo F. Padovan static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) 1549e4425ffSGustavo F. Padovan { 15523691d75SGustavo F. Padovan struct l2cap_chan *c; 1569e4425ffSGustavo F. Padovan 15723691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 15823691d75SGustavo F. Padovan if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) 1599e4425ffSGustavo F. Padovan goto found; 1609e4425ffSGustavo F. Padovan } 1619e4425ffSGustavo F. Padovan 16223691d75SGustavo F. Padovan c = NULL; 1639e4425ffSGustavo F. Padovan found: 16423691d75SGustavo F. Padovan return c; 1659e4425ffSGustavo F. Padovan } 1669e4425ffSGustavo F. Padovan 1679e4425ffSGustavo F. Padovan int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) 1689e4425ffSGustavo F. Padovan { 16973b2ec18SGustavo F. Padovan int err; 17073b2ec18SGustavo F. Padovan 17123691d75SGustavo F. Padovan write_lock_bh(&chan_list_lock); 1729e4425ffSGustavo F. Padovan 17323691d75SGustavo F. Padovan if (psm && __l2cap_global_chan_by_addr(psm, src)) { 17473b2ec18SGustavo F. Padovan err = -EADDRINUSE; 17573b2ec18SGustavo F. Padovan goto done; 1769e4425ffSGustavo F. Padovan } 1779e4425ffSGustavo F. Padovan 17873b2ec18SGustavo F. Padovan if (psm) { 1799e4425ffSGustavo F. Padovan chan->psm = psm; 1809e4425ffSGustavo F. Padovan chan->sport = psm; 18173b2ec18SGustavo F. Padovan err = 0; 18273b2ec18SGustavo F. Padovan } else { 18373b2ec18SGustavo F. Padovan u16 p; 1849e4425ffSGustavo F. Padovan 18573b2ec18SGustavo F. Padovan err = -EINVAL; 18673b2ec18SGustavo F. Padovan for (p = 0x1001; p < 0x1100; p += 2) 18723691d75SGustavo F. Padovan if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { 18873b2ec18SGustavo F. Padovan chan->psm = cpu_to_le16(p); 18973b2ec18SGustavo F. Padovan chan->sport = cpu_to_le16(p); 19073b2ec18SGustavo F. Padovan err = 0; 19173b2ec18SGustavo F. Padovan break; 19273b2ec18SGustavo F. Padovan } 19373b2ec18SGustavo F. Padovan } 19473b2ec18SGustavo F. Padovan 19573b2ec18SGustavo F. Padovan done: 19623691d75SGustavo F. Padovan write_unlock_bh(&chan_list_lock); 19773b2ec18SGustavo F. Padovan return err; 1989e4425ffSGustavo F. Padovan } 1999e4425ffSGustavo F. Padovan 2009e4425ffSGustavo F. Padovan int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) 2019e4425ffSGustavo F. Padovan { 20223691d75SGustavo F. Padovan write_lock_bh(&chan_list_lock); 2039e4425ffSGustavo F. Padovan 2049e4425ffSGustavo F. Padovan chan->scid = scid; 2059e4425ffSGustavo F. Padovan 20623691d75SGustavo F. Padovan write_unlock_bh(&chan_list_lock); 2079e4425ffSGustavo F. Padovan 2089e4425ffSGustavo F. Padovan return 0; 2099e4425ffSGustavo F. Padovan } 2109e4425ffSGustavo F. Padovan 211baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 2120a708f8fSGustavo F. Padovan { 2130a708f8fSGustavo F. Padovan u16 cid = L2CAP_CID_DYN_START; 2140a708f8fSGustavo F. Padovan 2150a708f8fSGustavo F. Padovan for (; cid < L2CAP_CID_DYN_END; cid++) { 216baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 2170a708f8fSGustavo F. Padovan return cid; 2180a708f8fSGustavo F. Padovan } 2190a708f8fSGustavo F. Padovan 2200a708f8fSGustavo F. Padovan return 0; 2210a708f8fSGustavo F. Padovan } 2220a708f8fSGustavo F. Padovan 223ab07801dSGustavo F. Padovan static void l2cap_chan_set_timer(struct l2cap_chan *chan, long timeout) 224ab07801dSGustavo F. Padovan { 22589bc500eSGustavo F. Padovan BT_DBG("chan %p state %d timeout %ld", chan->sk, chan->state, timeout); 22689bc500eSGustavo F. Padovan 227ab07801dSGustavo F. Padovan if (!mod_timer(&chan->chan_timer, jiffies + timeout)) 22871ba0e56SGustavo F. Padovan chan_hold(chan); 229ab07801dSGustavo F. Padovan } 230ab07801dSGustavo F. Padovan 231500698d3SGustavo F. Padovan static void l2cap_chan_clear_timer(struct l2cap_chan *chan) 232ab07801dSGustavo F. Padovan { 23389bc500eSGustavo F. Padovan BT_DBG("chan %p state %d", chan, chan->state); 234ab07801dSGustavo F. Padovan 235ab07801dSGustavo F. Padovan if (timer_pending(&chan->chan_timer) && del_timer(&chan->chan_timer)) 23671ba0e56SGustavo F. Padovan chan_put(chan); 237ab07801dSGustavo F. Padovan } 238ab07801dSGustavo F. Padovan 23989bc500eSGustavo F. Padovan static void l2cap_state_change(struct l2cap_chan *chan, int state) 24089bc500eSGustavo F. Padovan { 24189bc500eSGustavo F. Padovan chan->state = state; 24289bc500eSGustavo F. Padovan chan->ops->state_change(chan->data, state); 24389bc500eSGustavo F. Padovan } 24489bc500eSGustavo F. Padovan 245ab07801dSGustavo F. Padovan static void l2cap_chan_timeout(unsigned long arg) 246ab07801dSGustavo F. Padovan { 247ab07801dSGustavo F. Padovan struct l2cap_chan *chan = (struct l2cap_chan *) arg; 248ab07801dSGustavo F. Padovan struct sock *sk = chan->sk; 249ab07801dSGustavo F. Padovan int reason; 250ab07801dSGustavo F. Padovan 25189bc500eSGustavo F. Padovan BT_DBG("chan %p state %d", chan, chan->state); 252ab07801dSGustavo F. Padovan 253ab07801dSGustavo F. Padovan bh_lock_sock(sk); 254ab07801dSGustavo F. Padovan 255ab07801dSGustavo F. Padovan if (sock_owned_by_user(sk)) { 256ab07801dSGustavo F. Padovan /* sk is owned by user. Try again later */ 257ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 5); 258ab07801dSGustavo F. Padovan bh_unlock_sock(sk); 25971ba0e56SGustavo F. Padovan chan_put(chan); 260ab07801dSGustavo F. Padovan return; 261ab07801dSGustavo F. Padovan } 262ab07801dSGustavo F. Padovan 26389bc500eSGustavo F. Padovan if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) 264ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 26589bc500eSGustavo F. Padovan else if (chan->state == BT_CONNECT && 266ab07801dSGustavo F. Padovan chan->sec_level != BT_SECURITY_SDP) 267ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 268ab07801dSGustavo F. Padovan else 269ab07801dSGustavo F. Padovan reason = ETIMEDOUT; 270ab07801dSGustavo F. Padovan 2710f852724SGustavo F. Padovan l2cap_chan_close(chan, reason); 272ab07801dSGustavo F. Padovan 273ab07801dSGustavo F. Padovan bh_unlock_sock(sk); 274ab07801dSGustavo F. Padovan 275ba3bd0eeSGustavo F. Padovan chan->ops->close(chan->data); 27671ba0e56SGustavo F. Padovan chan_put(chan); 277ab07801dSGustavo F. Padovan } 278ab07801dSGustavo F. Padovan 27923691d75SGustavo F. Padovan struct l2cap_chan *l2cap_chan_create(struct sock *sk) 2800a708f8fSGustavo F. Padovan { 28148454079SGustavo F. Padovan struct l2cap_chan *chan; 2820a708f8fSGustavo F. Padovan 28348454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 28448454079SGustavo F. Padovan if (!chan) 28548454079SGustavo F. Padovan return NULL; 2860a708f8fSGustavo F. Padovan 28748454079SGustavo F. Padovan chan->sk = sk; 28848454079SGustavo F. Padovan 28923691d75SGustavo F. Padovan write_lock_bh(&chan_list_lock); 29023691d75SGustavo F. Padovan list_add(&chan->global_l, &chan_list); 29123691d75SGustavo F. Padovan write_unlock_bh(&chan_list_lock); 29223691d75SGustavo F. Padovan 293ab07801dSGustavo F. Padovan setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan); 294ab07801dSGustavo F. Padovan 29589bc500eSGustavo F. Padovan chan->state = BT_OPEN; 29689bc500eSGustavo F. Padovan 29771ba0e56SGustavo F. Padovan atomic_set(&chan->refcnt, 1); 29871ba0e56SGustavo F. Padovan 29948454079SGustavo F. Padovan return chan; 3000a708f8fSGustavo F. Padovan } 3010a708f8fSGustavo F. Padovan 30223691d75SGustavo F. Padovan void l2cap_chan_destroy(struct l2cap_chan *chan) 3036ff5abbfSGustavo F. Padovan { 30423691d75SGustavo F. Padovan write_lock_bh(&chan_list_lock); 30523691d75SGustavo F. Padovan list_del(&chan->global_l); 30623691d75SGustavo F. Padovan write_unlock_bh(&chan_list_lock); 30723691d75SGustavo F. Padovan 30871ba0e56SGustavo F. Padovan chan_put(chan); 3096ff5abbfSGustavo F. Padovan } 3106ff5abbfSGustavo F. Padovan 31148454079SGustavo F. Padovan static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 3120a708f8fSGustavo F. Padovan { 3130a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 314fe4128e0SGustavo F. Padovan chan->psm, chan->dcid); 3150a708f8fSGustavo F. Padovan 3160a708f8fSGustavo F. Padovan conn->disc_reason = 0x13; 3170a708f8fSGustavo F. Padovan 3188c1d787bSGustavo F. Padovan chan->conn = conn; 3190a708f8fSGustavo F. Padovan 320715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { 321b62f328bSVille Tervo if (conn->hcon->type == LE_LINK) { 322b62f328bSVille Tervo /* LE connection */ 3230c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_LE_DEFAULT_MTU; 324fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_LE_DATA; 325fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_LE_DATA; 326b62f328bSVille Tervo } else { 3270a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 328fe4128e0SGustavo F. Padovan chan->scid = l2cap_alloc_cid(conn); 3290c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 330b62f328bSVille Tervo } 331715ec005SGustavo F. Padovan } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 3320a708f8fSGustavo F. Padovan /* Connectionless socket */ 333fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_CONN_LESS; 334fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_CONN_LESS; 3350c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 3360a708f8fSGustavo F. Padovan } else { 3370a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 338fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_SIGNALING; 339fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_SIGNALING; 3400c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 3410a708f8fSGustavo F. Padovan } 3420a708f8fSGustavo F. Padovan 34371ba0e56SGustavo F. Padovan chan_hold(chan); 344baa7e1faSGustavo F. Padovan 345baa7e1faSGustavo F. Padovan list_add(&chan->list, &conn->chan_l); 3460a708f8fSGustavo F. Padovan } 3470a708f8fSGustavo F. Padovan 3480a708f8fSGustavo F. Padovan /* Delete channel. 3490a708f8fSGustavo F. Padovan * Must be called on the locked socket. */ 3504519de9aSGustavo F. Padovan static void l2cap_chan_del(struct l2cap_chan *chan, int err) 3510a708f8fSGustavo F. Padovan { 35248454079SGustavo F. Padovan struct sock *sk = chan->sk; 3538c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 3540a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 3550a708f8fSGustavo F. Padovan 356ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 3570a708f8fSGustavo F. Padovan 35849208c9cSGustavo F. Padovan BT_DBG("chan %p, conn %p, err %d", chan, conn, err); 3590a708f8fSGustavo F. Padovan 3600a708f8fSGustavo F. Padovan if (conn) { 361baa7e1faSGustavo F. Padovan /* Delete from channel list */ 362baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 363baa7e1faSGustavo F. Padovan list_del(&chan->list); 364baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 36571ba0e56SGustavo F. Padovan chan_put(chan); 366baa7e1faSGustavo F. Padovan 3678c1d787bSGustavo F. Padovan chan->conn = NULL; 3680a708f8fSGustavo F. Padovan hci_conn_put(conn->hcon); 3690a708f8fSGustavo F. Padovan } 3700a708f8fSGustavo F. Padovan 37189bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CLOSED); 3720a708f8fSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 3730a708f8fSGustavo F. Padovan 3740a708f8fSGustavo F. Padovan if (err) 3750a708f8fSGustavo F. Padovan sk->sk_err = err; 3760a708f8fSGustavo F. Padovan 3770a708f8fSGustavo F. Padovan if (parent) { 3780a708f8fSGustavo F. Padovan bt_accept_unlink(sk); 3790a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 3800a708f8fSGustavo F. Padovan } else 3810a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 3820a708f8fSGustavo F. Padovan 383b4450035SGustavo F. Padovan if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE && 384b4450035SGustavo F. Padovan chan->conf_state & L2CAP_CONF_INPUT_DONE)) 3856ff5abbfSGustavo F. Padovan return; 3862ead70b8SGustavo F. Padovan 38758d35f87SGustavo F. Padovan skb_queue_purge(&chan->tx_q); 3880a708f8fSGustavo F. Padovan 3890c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) { 3900a708f8fSGustavo F. Padovan struct srej_list *l, *tmp; 3910a708f8fSGustavo F. Padovan 392e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 393e92c8e70SGustavo F. Padovan del_timer(&chan->monitor_timer); 394e92c8e70SGustavo F. Padovan del_timer(&chan->ack_timer); 3950a708f8fSGustavo F. Padovan 396f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->srej_q); 397f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->busy_q); 3980a708f8fSGustavo F. Padovan 39939d5a3eeSGustavo F. Padovan list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { 4000a708f8fSGustavo F. Padovan list_del(&l->list); 4010a708f8fSGustavo F. Padovan kfree(l); 4020a708f8fSGustavo F. Padovan } 4030a708f8fSGustavo F. Padovan } 4040a708f8fSGustavo F. Padovan } 4050a708f8fSGustavo F. Padovan 4064519de9aSGustavo F. Padovan static void l2cap_chan_cleanup_listen(struct sock *parent) 4074519de9aSGustavo F. Padovan { 4084519de9aSGustavo F. Padovan struct sock *sk; 4094519de9aSGustavo F. Padovan 4104519de9aSGustavo F. Padovan BT_DBG("parent %p", parent); 4114519de9aSGustavo F. Padovan 4124519de9aSGustavo F. Padovan /* Close not yet accepted channels */ 4130f852724SGustavo F. Padovan while ((sk = bt_accept_dequeue(parent, NULL))) { 414ba3bd0eeSGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 415ba3bd0eeSGustavo F. Padovan l2cap_chan_clear_timer(chan); 4160f852724SGustavo F. Padovan lock_sock(sk); 417ba3bd0eeSGustavo F. Padovan l2cap_chan_close(chan, ECONNRESET); 4180f852724SGustavo F. Padovan release_sock(sk); 419ba3bd0eeSGustavo F. Padovan chan->ops->close(chan->data); 4200f852724SGustavo F. Padovan } 4214519de9aSGustavo F. Padovan } 4224519de9aSGustavo F. Padovan 4230f852724SGustavo F. Padovan void l2cap_chan_close(struct l2cap_chan *chan, int reason) 4244519de9aSGustavo F. Padovan { 4254519de9aSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 4264519de9aSGustavo F. Padovan struct sock *sk = chan->sk; 4274519de9aSGustavo F. Padovan 42889bc500eSGustavo F. Padovan BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket); 4294519de9aSGustavo F. Padovan 43089bc500eSGustavo F. Padovan switch (chan->state) { 4314519de9aSGustavo F. Padovan case BT_LISTEN: 4324519de9aSGustavo F. Padovan l2cap_chan_cleanup_listen(sk); 43389bc500eSGustavo F. Padovan 43489bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CLOSED); 43589bc500eSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 4364519de9aSGustavo F. Padovan break; 4374519de9aSGustavo F. Padovan 4384519de9aSGustavo F. Padovan case BT_CONNECTED: 4394519de9aSGustavo F. Padovan case BT_CONFIG: 440715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 4414519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 442500698d3SGustavo F. Padovan l2cap_chan_clear_timer(chan); 443ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, sk->sk_sndtimeo); 4444519de9aSGustavo F. Padovan l2cap_send_disconn_req(conn, chan, reason); 4454519de9aSGustavo F. Padovan } else 4464519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 4474519de9aSGustavo F. Padovan break; 4484519de9aSGustavo F. Padovan 4494519de9aSGustavo F. Padovan case BT_CONNECT2: 450715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 4514519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 4524519de9aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 4534519de9aSGustavo F. Padovan __u16 result; 4544519de9aSGustavo F. Padovan 4554519de9aSGustavo F. Padovan if (bt_sk(sk)->defer_setup) 4564519de9aSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 4574519de9aSGustavo F. Padovan else 4584519de9aSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 45989bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_DISCONN); 4604519de9aSGustavo F. Padovan 4614519de9aSGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 4624519de9aSGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 4634519de9aSGustavo F. Padovan rsp.result = cpu_to_le16(result); 4644519de9aSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 4654519de9aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 4664519de9aSGustavo F. Padovan sizeof(rsp), &rsp); 4674519de9aSGustavo F. Padovan } 4684519de9aSGustavo F. Padovan 4694519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 4704519de9aSGustavo F. Padovan break; 4714519de9aSGustavo F. Padovan 4724519de9aSGustavo F. Padovan case BT_CONNECT: 4734519de9aSGustavo F. Padovan case BT_DISCONN: 4744519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 4754519de9aSGustavo F. Padovan break; 4764519de9aSGustavo F. Padovan 4774519de9aSGustavo F. Padovan default: 4784519de9aSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 4794519de9aSGustavo F. Padovan break; 4804519de9aSGustavo F. Padovan } 4814519de9aSGustavo F. Padovan } 4824519de9aSGustavo F. Padovan 4834343478fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) 4840a708f8fSGustavo F. Padovan { 485715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_RAW) { 4864343478fSGustavo F. Padovan switch (chan->sec_level) { 4870a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 4880a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 4890a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 4900a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 4910a708f8fSGustavo F. Padovan default: 4920a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 4930a708f8fSGustavo F. Padovan } 494fe4128e0SGustavo F. Padovan } else if (chan->psm == cpu_to_le16(0x0001)) { 4954343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_LOW) 4964343478fSGustavo F. Padovan chan->sec_level = BT_SECURITY_SDP; 4970a708f8fSGustavo F. Padovan 4984343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_HIGH) 4990a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 5000a708f8fSGustavo F. Padovan else 5010a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 5020a708f8fSGustavo F. Padovan } else { 5034343478fSGustavo F. Padovan switch (chan->sec_level) { 5040a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 5050a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 5060a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 5070a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 5080a708f8fSGustavo F. Padovan default: 5090a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 5100a708f8fSGustavo F. Padovan } 5110a708f8fSGustavo F. Padovan } 5120a708f8fSGustavo F. Padovan } 5130a708f8fSGustavo F. Padovan 5140a708f8fSGustavo F. Padovan /* Service level security */ 5154343478fSGustavo F. Padovan static inline int l2cap_check_security(struct l2cap_chan *chan) 5160a708f8fSGustavo F. Padovan { 5178c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5180a708f8fSGustavo F. Padovan __u8 auth_type; 5190a708f8fSGustavo F. Padovan 5204343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 5210a708f8fSGustavo F. Padovan 5224343478fSGustavo F. Padovan return hci_conn_security(conn->hcon, chan->sec_level, auth_type); 5230a708f8fSGustavo F. Padovan } 5240a708f8fSGustavo F. Padovan 525b5ad8b7fSJohannes Berg static u8 l2cap_get_ident(struct l2cap_conn *conn) 5260a708f8fSGustavo F. Padovan { 5270a708f8fSGustavo F. Padovan u8 id; 5280a708f8fSGustavo F. Padovan 5290a708f8fSGustavo F. Padovan /* Get next available identificator. 5300a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 5310a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 5320a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 5330a708f8fSGustavo F. Padovan */ 5340a708f8fSGustavo F. Padovan 5350a708f8fSGustavo F. Padovan spin_lock_bh(&conn->lock); 5360a708f8fSGustavo F. Padovan 5370a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 5380a708f8fSGustavo F. Padovan conn->tx_ident = 1; 5390a708f8fSGustavo F. Padovan 5400a708f8fSGustavo F. Padovan id = conn->tx_ident; 5410a708f8fSGustavo F. Padovan 5420a708f8fSGustavo F. Padovan spin_unlock_bh(&conn->lock); 5430a708f8fSGustavo F. Padovan 5440a708f8fSGustavo F. Padovan return id; 5450a708f8fSGustavo F. Padovan } 5460a708f8fSGustavo F. Padovan 5474519de9aSGustavo F. Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) 5480a708f8fSGustavo F. Padovan { 5490a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 5500a708f8fSGustavo F. Padovan u8 flags; 5510a708f8fSGustavo F. Padovan 5520a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 5530a708f8fSGustavo F. Padovan 5540a708f8fSGustavo F. Padovan if (!skb) 5550a708f8fSGustavo F. Padovan return; 5560a708f8fSGustavo F. Padovan 5570a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 5580a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 5590a708f8fSGustavo F. Padovan else 5600a708f8fSGustavo F. Padovan flags = ACL_START; 5610a708f8fSGustavo F. Padovan 56214b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; 56314b12d0bSJaikumar Ganesh 5640a708f8fSGustavo F. Padovan hci_send_acl(conn->hcon, skb, flags); 5650a708f8fSGustavo F. Padovan } 5660a708f8fSGustavo F. Padovan 567525cd185SGustavo F. Padovan static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) 5680a708f8fSGustavo F. Padovan { 5690a708f8fSGustavo F. Padovan struct sk_buff *skb; 5700a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 5718c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5720a708f8fSGustavo F. Padovan int count, hlen = L2CAP_HDR_SIZE + 2; 5730a708f8fSGustavo F. Padovan u8 flags; 5740a708f8fSGustavo F. Padovan 57589bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 5760a708f8fSGustavo F. Padovan return; 5770a708f8fSGustavo F. Padovan 57847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 5790a708f8fSGustavo F. Padovan hlen += 2; 5800a708f8fSGustavo F. Padovan 58149208c9cSGustavo F. Padovan BT_DBG("chan %p, control 0x%2.2x", chan, control); 5820a708f8fSGustavo F. Padovan 5830a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, hlen); 5840a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FRAME_TYPE; 5850a708f8fSGustavo F. Padovan 586525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { 5870a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 588525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; 5890a708f8fSGustavo F. Padovan } 5900a708f8fSGustavo F. Padovan 591525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_PBIT) { 5920a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_POLL; 593525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_PBIT; 5940a708f8fSGustavo F. Padovan } 5950a708f8fSGustavo F. Padovan 5960a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 5970a708f8fSGustavo F. Padovan if (!skb) 5980a708f8fSGustavo F. Padovan return; 5990a708f8fSGustavo F. Padovan 6000a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 6010a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 602fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 6030a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 6040a708f8fSGustavo F. Padovan 60547d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 6060a708f8fSGustavo F. Padovan u16 fcs = crc16(0, (u8 *)lh, count - 2); 6070a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb_put(skb, 2)); 6080a708f8fSGustavo F. Padovan } 6090a708f8fSGustavo F. Padovan 6100a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 6110a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 6120a708f8fSGustavo F. Padovan else 6130a708f8fSGustavo F. Padovan flags = ACL_START; 6140a708f8fSGustavo F. Padovan 61514b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = chan->force_active; 61614b12d0bSJaikumar Ganesh 6178c1d787bSGustavo F. Padovan hci_send_acl(chan->conn->hcon, skb, flags); 6180a708f8fSGustavo F. Padovan } 6190a708f8fSGustavo F. Padovan 620525cd185SGustavo F. Padovan static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) 6210a708f8fSGustavo F. Padovan { 622525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 6230a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 624525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 6250a708f8fSGustavo F. Padovan } else 6260a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 6270a708f8fSGustavo F. Padovan 62842e5c802SGustavo F. Padovan control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 6290a708f8fSGustavo F. Padovan 630525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 6310a708f8fSGustavo F. Padovan } 6320a708f8fSGustavo F. Padovan 633b4450035SGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) 6340a708f8fSGustavo F. Padovan { 635b4450035SGustavo F. Padovan return !(chan->conf_state & L2CAP_CONF_CONNECT_PEND); 6360a708f8fSGustavo F. Padovan } 6370a708f8fSGustavo F. Padovan 638fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 6390a708f8fSGustavo F. Padovan { 6408c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 6410a708f8fSGustavo F. Padovan 6420a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 6430a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 6440a708f8fSGustavo F. Padovan return; 6450a708f8fSGustavo F. Padovan 6464343478fSGustavo F. Padovan if (l2cap_check_security(chan) && 6474343478fSGustavo F. Padovan __l2cap_no_conn_pending(chan)) { 6480a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 649fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 650fe4128e0SGustavo F. Padovan req.psm = chan->psm; 6510a708f8fSGustavo F. Padovan 652fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 653b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_CONNECT_PEND; 6540a708f8fSGustavo F. Padovan 655fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 656fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 6570a708f8fSGustavo F. Padovan } 6580a708f8fSGustavo F. Padovan } else { 6590a708f8fSGustavo F. Padovan struct l2cap_info_req req; 6600a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 6610a708f8fSGustavo F. Padovan 6620a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 6630a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 6640a708f8fSGustavo F. Padovan 6650a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 6660a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 6670a708f8fSGustavo F. Padovan 6680a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 6690a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 6700a708f8fSGustavo F. Padovan } 6710a708f8fSGustavo F. Padovan } 6720a708f8fSGustavo F. Padovan 6730a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 6740a708f8fSGustavo F. Padovan { 6750a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 6760a708f8fSGustavo F. Padovan if (!disable_ertm) 6770a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 6780a708f8fSGustavo F. Padovan 6790a708f8fSGustavo F. Padovan switch (mode) { 6800a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 6810a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 6820a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 6830a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 6840a708f8fSGustavo F. Padovan default: 6850a708f8fSGustavo F. Padovan return 0x00; 6860a708f8fSGustavo F. Padovan } 6870a708f8fSGustavo F. Padovan } 6880a708f8fSGustavo F. Padovan 6894519de9aSGustavo F. Padovan static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) 6900a708f8fSGustavo F. Padovan { 691e92c8e70SGustavo F. Padovan struct sock *sk; 6920a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 6930a708f8fSGustavo F. Padovan 6940a708f8fSGustavo F. Padovan if (!conn) 6950a708f8fSGustavo F. Padovan return; 6960a708f8fSGustavo F. Padovan 697e92c8e70SGustavo F. Padovan sk = chan->sk; 698e92c8e70SGustavo F. Padovan 6990c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) { 700e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 701e92c8e70SGustavo F. Padovan del_timer(&chan->monitor_timer); 702e92c8e70SGustavo F. Padovan del_timer(&chan->ack_timer); 7030a708f8fSGustavo F. Padovan } 7040a708f8fSGustavo F. Padovan 705fe4128e0SGustavo F. Padovan req.dcid = cpu_to_le16(chan->dcid); 706fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 7070a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 7080a708f8fSGustavo F. Padovan L2CAP_DISCONN_REQ, sizeof(req), &req); 7090a708f8fSGustavo F. Padovan 71089bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_DISCONN); 7110a708f8fSGustavo F. Padovan sk->sk_err = err; 7120a708f8fSGustavo F. Padovan } 7130a708f8fSGustavo F. Padovan 7140a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 7150a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 7160a708f8fSGustavo F. Padovan { 717820ffdb3SGustavo F. Padovan struct l2cap_chan *chan, *tmp; 7180a708f8fSGustavo F. Padovan 7190a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 7200a708f8fSGustavo F. Padovan 721baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 7220a708f8fSGustavo F. Padovan 723820ffdb3SGustavo F. Padovan list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 72448454079SGustavo F. Padovan struct sock *sk = chan->sk; 725baa7e1faSGustavo F. Padovan 7260a708f8fSGustavo F. Padovan bh_lock_sock(sk); 7270a708f8fSGustavo F. Padovan 728715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 7290a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7300a708f8fSGustavo F. Padovan continue; 7310a708f8fSGustavo F. Padovan } 7320a708f8fSGustavo F. Padovan 73389bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 7340a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 7350a708f8fSGustavo F. Padovan 7364343478fSGustavo F. Padovan if (!l2cap_check_security(chan) || 737b4450035SGustavo F. Padovan !__l2cap_no_conn_pending(chan)) { 7380a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7390a708f8fSGustavo F. Padovan continue; 7400a708f8fSGustavo F. Padovan } 7410a708f8fSGustavo F. Padovan 7420c1bc5c6SGustavo F. Padovan if (!l2cap_mode_supported(chan->mode, 7430a708f8fSGustavo F. Padovan conn->feat_mask) 744b4450035SGustavo F. Padovan && chan->conf_state & 7450a708f8fSGustavo F. Padovan L2CAP_CONF_STATE2_DEVICE) { 7460f852724SGustavo F. Padovan /* l2cap_chan_close() calls list_del(chan) 747820ffdb3SGustavo F. Padovan * so release the lock */ 748820ffdb3SGustavo F. Padovan read_unlock_bh(&conn->chan_lock); 7490f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNRESET); 750820ffdb3SGustavo F. Padovan read_lock_bh(&conn->chan_lock); 7510a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7520a708f8fSGustavo F. Padovan continue; 7530a708f8fSGustavo F. Padovan } 7540a708f8fSGustavo F. Padovan 755fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 756fe4128e0SGustavo F. Padovan req.psm = chan->psm; 7570a708f8fSGustavo F. Padovan 758fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 759b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_CONNECT_PEND; 7600a708f8fSGustavo F. Padovan 761fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 762fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 7630a708f8fSGustavo F. Padovan 76489bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 7650a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 7660a708f8fSGustavo F. Padovan char buf[128]; 767fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 768fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 7690a708f8fSGustavo F. Padovan 7704343478fSGustavo F. Padovan if (l2cap_check_security(chan)) { 7710a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 7720a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 7730a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 7740a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 7750a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 7760a708f8fSGustavo F. Padovan 7770a708f8fSGustavo F. Padovan } else { 77889bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 7790a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 7800a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 7810a708f8fSGustavo F. Padovan } 7820a708f8fSGustavo F. Padovan } else { 7830a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 7840a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 7850a708f8fSGustavo F. Padovan } 7860a708f8fSGustavo F. Padovan 787fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 788fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 7890a708f8fSGustavo F. Padovan 790b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_REQ_SENT || 7910a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 7920a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7930a708f8fSGustavo F. Padovan continue; 7940a708f8fSGustavo F. Padovan } 7950a708f8fSGustavo F. Padovan 796b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 7970a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 79873ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 79973ffa904SGustavo F. Padovan chan->num_conf_req++; 8000a708f8fSGustavo F. Padovan } 8010a708f8fSGustavo F. Padovan 8020a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 8030a708f8fSGustavo F. Padovan } 8040a708f8fSGustavo F. Padovan 805baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 8060a708f8fSGustavo F. Padovan } 8070a708f8fSGustavo F. Padovan 808b62f328bSVille Tervo /* Find socket with cid and source bdaddr. 809b62f328bSVille Tervo * Returns closest match, locked. 810b62f328bSVille Tervo */ 81123691d75SGustavo F. Padovan static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) 812b62f328bSVille Tervo { 81323691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 814b62f328bSVille Tervo 81523691d75SGustavo F. Padovan read_lock(&chan_list_lock); 816b62f328bSVille Tervo 81723691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 81823691d75SGustavo F. Padovan struct sock *sk = c->sk; 819fe4128e0SGustavo F. Padovan 82089bc500eSGustavo F. Padovan if (state && c->state != state) 821b62f328bSVille Tervo continue; 822b62f328bSVille Tervo 82323691d75SGustavo F. Padovan if (c->scid == cid) { 824b62f328bSVille Tervo /* Exact match. */ 82523691d75SGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, src)) { 82623691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 82723691d75SGustavo F. Padovan return c; 82823691d75SGustavo F. Padovan } 829b62f328bSVille Tervo 830b62f328bSVille Tervo /* Closest match */ 831b62f328bSVille Tervo if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 83223691d75SGustavo F. Padovan c1 = c; 833b62f328bSVille Tervo } 834b62f328bSVille Tervo } 835280f294fSGustavo F. Padovan 83623691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 837b62f328bSVille Tervo 83823691d75SGustavo F. Padovan return c1; 839b62f328bSVille Tervo } 840b62f328bSVille Tervo 841b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 842b62f328bSVille Tervo { 843c916fbe4SGustavo F. Padovan struct sock *parent, *sk; 84423691d75SGustavo F. Padovan struct l2cap_chan *chan, *pchan; 845b62f328bSVille Tervo 846b62f328bSVille Tervo BT_DBG(""); 847b62f328bSVille Tervo 848b62f328bSVille Tervo /* Check if we have socket listening on cid */ 84923691d75SGustavo F. Padovan pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, 850b62f328bSVille Tervo conn->src); 85123691d75SGustavo F. Padovan if (!pchan) 852b62f328bSVille Tervo return; 853b62f328bSVille Tervo 85423691d75SGustavo F. Padovan parent = pchan->sk; 85523691d75SGustavo F. Padovan 85662f3a2cfSGustavo F. Padovan bh_lock_sock(parent); 85762f3a2cfSGustavo F. Padovan 858b62f328bSVille Tervo /* Check for backlog size */ 859b62f328bSVille Tervo if (sk_acceptq_is_full(parent)) { 860b62f328bSVille Tervo BT_DBG("backlog full %d", parent->sk_ack_backlog); 861b62f328bSVille Tervo goto clean; 862b62f328bSVille Tervo } 863b62f328bSVille Tervo 86480808e43SGustavo F. Padovan chan = pchan->ops->new_connection(pchan->data); 86580808e43SGustavo F. Padovan if (!chan) 866b62f328bSVille Tervo goto clean; 867b62f328bSVille Tervo 86880808e43SGustavo F. Padovan sk = chan->sk; 8695d41ce1dSGustavo F. Padovan 870baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 871b62f328bSVille Tervo 872b62f328bSVille Tervo hci_conn_hold(conn->hcon); 873b62f328bSVille Tervo 874b62f328bSVille Tervo bacpy(&bt_sk(sk)->src, conn->src); 875b62f328bSVille Tervo bacpy(&bt_sk(sk)->dst, conn->dst); 876b62f328bSVille Tervo 877d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 878d1010240SGustavo F. Padovan 87948454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 88048454079SGustavo F. Padovan 881ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, sk->sk_sndtimeo); 882b62f328bSVille Tervo 88389bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECTED); 884b62f328bSVille Tervo parent->sk_data_ready(parent, 0); 885b62f328bSVille Tervo 886baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 887b62f328bSVille Tervo 888b62f328bSVille Tervo clean: 889b62f328bSVille Tervo bh_unlock_sock(parent); 890b62f328bSVille Tervo } 891b62f328bSVille Tervo 8920a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 8930a708f8fSGustavo F. Padovan { 89448454079SGustavo F. Padovan struct l2cap_chan *chan; 8950a708f8fSGustavo F. Padovan 8960a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 8970a708f8fSGustavo F. Padovan 898b62f328bSVille Tervo if (!conn->hcon->out && conn->hcon->type == LE_LINK) 899b62f328bSVille Tervo l2cap_le_conn_ready(conn); 900b62f328bSVille Tervo 901baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 9020a708f8fSGustavo F. Padovan 903baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 90448454079SGustavo F. Padovan struct sock *sk = chan->sk; 905baa7e1faSGustavo F. Padovan 9060a708f8fSGustavo F. Padovan bh_lock_sock(sk); 9070a708f8fSGustavo F. Padovan 908acd7d370SVille Tervo if (conn->hcon->type == LE_LINK) { 909ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 91089bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECTED); 911acd7d370SVille Tervo sk->sk_state_change(sk); 912acd7d370SVille Tervo } 913acd7d370SVille Tervo 914715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 915ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 91689bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECTED); 9170a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 91889bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT) 919fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 9200a708f8fSGustavo F. Padovan 9210a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9220a708f8fSGustavo F. Padovan } 9230a708f8fSGustavo F. Padovan 924baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 9250a708f8fSGustavo F. Padovan } 9260a708f8fSGustavo F. Padovan 9270a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 9280a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 9290a708f8fSGustavo F. Padovan { 93048454079SGustavo F. Padovan struct l2cap_chan *chan; 9310a708f8fSGustavo F. Padovan 9320a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 9330a708f8fSGustavo F. Padovan 934baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 9350a708f8fSGustavo F. Padovan 936baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 93748454079SGustavo F. Padovan struct sock *sk = chan->sk; 938baa7e1faSGustavo F. Padovan 9394343478fSGustavo F. Padovan if (chan->force_reliable) 9400a708f8fSGustavo F. Padovan sk->sk_err = err; 9410a708f8fSGustavo F. Padovan } 9420a708f8fSGustavo F. Padovan 943baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 9440a708f8fSGustavo F. Padovan } 9450a708f8fSGustavo F. Padovan 9460a708f8fSGustavo F. Padovan static void l2cap_info_timeout(unsigned long arg) 9470a708f8fSGustavo F. Padovan { 9480a708f8fSGustavo F. Padovan struct l2cap_conn *conn = (void *) arg; 9490a708f8fSGustavo F. Padovan 9500a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 9510a708f8fSGustavo F. Padovan conn->info_ident = 0; 9520a708f8fSGustavo F. Padovan 9530a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 9540a708f8fSGustavo F. Padovan } 9550a708f8fSGustavo F. Padovan 9560a708f8fSGustavo F. Padovan static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) 9570a708f8fSGustavo F. Padovan { 9580a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 9590a708f8fSGustavo F. Padovan 9600a708f8fSGustavo F. Padovan if (conn || status) 9610a708f8fSGustavo F. Padovan return conn; 9620a708f8fSGustavo F. Padovan 9630a708f8fSGustavo F. Padovan conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); 9640a708f8fSGustavo F. Padovan if (!conn) 9650a708f8fSGustavo F. Padovan return NULL; 9660a708f8fSGustavo F. Padovan 9670a708f8fSGustavo F. Padovan hcon->l2cap_data = conn; 9680a708f8fSGustavo F. Padovan conn->hcon = hcon; 9690a708f8fSGustavo F. Padovan 9700a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p", hcon, conn); 9710a708f8fSGustavo F. Padovan 972acd7d370SVille Tervo if (hcon->hdev->le_mtu && hcon->type == LE_LINK) 973acd7d370SVille Tervo conn->mtu = hcon->hdev->le_mtu; 974acd7d370SVille Tervo else 9750a708f8fSGustavo F. Padovan conn->mtu = hcon->hdev->acl_mtu; 976acd7d370SVille Tervo 9770a708f8fSGustavo F. Padovan conn->src = &hcon->hdev->bdaddr; 9780a708f8fSGustavo F. Padovan conn->dst = &hcon->dst; 9790a708f8fSGustavo F. Padovan 9800a708f8fSGustavo F. Padovan conn->feat_mask = 0; 9810a708f8fSGustavo F. Padovan 9820a708f8fSGustavo F. Padovan spin_lock_init(&conn->lock); 983baa7e1faSGustavo F. Padovan rwlock_init(&conn->chan_lock); 984baa7e1faSGustavo F. Padovan 985baa7e1faSGustavo F. Padovan INIT_LIST_HEAD(&conn->chan_l); 9860a708f8fSGustavo F. Padovan 987b62f328bSVille Tervo if (hcon->type != LE_LINK) 9880a708f8fSGustavo F. Padovan setup_timer(&conn->info_timer, l2cap_info_timeout, 9890a708f8fSGustavo F. Padovan (unsigned long) conn); 9900a708f8fSGustavo F. Padovan 9910a708f8fSGustavo F. Padovan conn->disc_reason = 0x13; 9920a708f8fSGustavo F. Padovan 9930a708f8fSGustavo F. Padovan return conn; 9940a708f8fSGustavo F. Padovan } 9950a708f8fSGustavo F. Padovan 9960a708f8fSGustavo F. Padovan static void l2cap_conn_del(struct hci_conn *hcon, int err) 9970a708f8fSGustavo F. Padovan { 9980a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 999baa7e1faSGustavo F. Padovan struct l2cap_chan *chan, *l; 10000a708f8fSGustavo F. Padovan struct sock *sk; 10010a708f8fSGustavo F. Padovan 10020a708f8fSGustavo F. Padovan if (!conn) 10030a708f8fSGustavo F. Padovan return; 10040a708f8fSGustavo F. Padovan 10050a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 10060a708f8fSGustavo F. Padovan 10070a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 10080a708f8fSGustavo F. Padovan 10090a708f8fSGustavo F. Padovan /* Kill channels */ 1010baa7e1faSGustavo F. Padovan list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 101148454079SGustavo F. Padovan sk = chan->sk; 10120a708f8fSGustavo F. Padovan bh_lock_sock(sk); 101348454079SGustavo F. Padovan l2cap_chan_del(chan, err); 10140a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 1015ba3bd0eeSGustavo F. Padovan chan->ops->close(chan->data); 10160a708f8fSGustavo F. Padovan } 10170a708f8fSGustavo F. Padovan 10180a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 10190a708f8fSGustavo F. Padovan del_timer_sync(&conn->info_timer); 10200a708f8fSGustavo F. Padovan 10210a708f8fSGustavo F. Padovan hcon->l2cap_data = NULL; 10220a708f8fSGustavo F. Padovan kfree(conn); 10230a708f8fSGustavo F. Padovan } 10240a708f8fSGustavo F. Padovan 102548454079SGustavo F. Padovan static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 10260a708f8fSGustavo F. Padovan { 1027baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 102848454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 1029baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 10300a708f8fSGustavo F. Padovan } 10310a708f8fSGustavo F. Padovan 10320a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 10330a708f8fSGustavo F. Padovan 10340a708f8fSGustavo F. Padovan /* Find socket with psm and source bdaddr. 10350a708f8fSGustavo F. Padovan * Returns closest match. 10360a708f8fSGustavo F. Padovan */ 103723691d75SGustavo F. Padovan static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) 10380a708f8fSGustavo F. Padovan { 103923691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 10400a708f8fSGustavo F. Padovan 104123691d75SGustavo F. Padovan read_lock(&chan_list_lock); 10420a708f8fSGustavo F. Padovan 104323691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 104423691d75SGustavo F. Padovan struct sock *sk = c->sk; 1045fe4128e0SGustavo F. Padovan 104689bc500eSGustavo F. Padovan if (state && c->state != state) 10470a708f8fSGustavo F. Padovan continue; 10480a708f8fSGustavo F. Padovan 104923691d75SGustavo F. Padovan if (c->psm == psm) { 10500a708f8fSGustavo F. Padovan /* Exact match. */ 105123691d75SGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, src)) { 1052a7567b20SJohannes Berg read_unlock(&chan_list_lock); 105323691d75SGustavo F. Padovan return c; 105423691d75SGustavo F. Padovan } 10550a708f8fSGustavo F. Padovan 10560a708f8fSGustavo F. Padovan /* Closest match */ 10570a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 105823691d75SGustavo F. Padovan c1 = c; 10590a708f8fSGustavo F. Padovan } 10600a708f8fSGustavo F. Padovan } 10610a708f8fSGustavo F. Padovan 106223691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 10630a708f8fSGustavo F. Padovan 106423691d75SGustavo F. Padovan return c1; 10650a708f8fSGustavo F. Padovan } 10660a708f8fSGustavo F. Padovan 106777a74c7eSGustavo F. Padovan int l2cap_chan_connect(struct l2cap_chan *chan) 10680a708f8fSGustavo F. Padovan { 10695d41ce1dSGustavo F. Padovan struct sock *sk = chan->sk; 10700a708f8fSGustavo F. Padovan bdaddr_t *src = &bt_sk(sk)->src; 10710a708f8fSGustavo F. Padovan bdaddr_t *dst = &bt_sk(sk)->dst; 10720a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 10730a708f8fSGustavo F. Padovan struct hci_conn *hcon; 10740a708f8fSGustavo F. Padovan struct hci_dev *hdev; 10750a708f8fSGustavo F. Padovan __u8 auth_type; 10760a708f8fSGustavo F. Padovan int err; 10770a708f8fSGustavo F. Padovan 10780a708f8fSGustavo F. Padovan BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), 1079fe4128e0SGustavo F. Padovan chan->psm); 10800a708f8fSGustavo F. Padovan 10810a708f8fSGustavo F. Padovan hdev = hci_get_route(dst, src); 10820a708f8fSGustavo F. Padovan if (!hdev) 10830a708f8fSGustavo F. Padovan return -EHOSTUNREACH; 10840a708f8fSGustavo F. Padovan 10850a708f8fSGustavo F. Padovan hci_dev_lock_bh(hdev); 10860a708f8fSGustavo F. Padovan 10874343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 10880a708f8fSGustavo F. Padovan 1089fe4128e0SGustavo F. Padovan if (chan->dcid == L2CAP_CID_LE_DATA) 1090acd7d370SVille Tervo hcon = hci_connect(hdev, LE_LINK, dst, 10914343478fSGustavo F. Padovan chan->sec_level, auth_type); 1092acd7d370SVille Tervo else 10930a708f8fSGustavo F. Padovan hcon = hci_connect(hdev, ACL_LINK, dst, 10944343478fSGustavo F. Padovan chan->sec_level, auth_type); 1095acd7d370SVille Tervo 109630e76272SVille Tervo if (IS_ERR(hcon)) { 109730e76272SVille Tervo err = PTR_ERR(hcon); 10980a708f8fSGustavo F. Padovan goto done; 109930e76272SVille Tervo } 11000a708f8fSGustavo F. Padovan 11010a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 11020a708f8fSGustavo F. Padovan if (!conn) { 11030a708f8fSGustavo F. Padovan hci_conn_put(hcon); 110430e76272SVille Tervo err = -ENOMEM; 11050a708f8fSGustavo F. Padovan goto done; 11060a708f8fSGustavo F. Padovan } 11070a708f8fSGustavo F. Padovan 11080a708f8fSGustavo F. Padovan /* Update source addr of the socket */ 11090a708f8fSGustavo F. Padovan bacpy(src, conn->src); 11100a708f8fSGustavo F. Padovan 111148454079SGustavo F. Padovan l2cap_chan_add(conn, chan); 111248454079SGustavo F. Padovan 111389bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECT); 1114ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, sk->sk_sndtimeo); 11150a708f8fSGustavo F. Padovan 11160a708f8fSGustavo F. Padovan if (hcon->state == BT_CONNECTED) { 1117715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 1118ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 11194343478fSGustavo F. Padovan if (l2cap_check_security(chan)) 112089bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECTED); 11210a708f8fSGustavo F. Padovan } else 1122fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 11230a708f8fSGustavo F. Padovan } 11240a708f8fSGustavo F. Padovan 112530e76272SVille Tervo err = 0; 112630e76272SVille Tervo 11270a708f8fSGustavo F. Padovan done: 11280a708f8fSGustavo F. Padovan hci_dev_unlock_bh(hdev); 11290a708f8fSGustavo F. Padovan hci_dev_put(hdev); 11300a708f8fSGustavo F. Padovan return err; 11310a708f8fSGustavo F. Padovan } 11320a708f8fSGustavo F. Padovan 1133dcba0dbaSGustavo F. Padovan int __l2cap_wait_ack(struct sock *sk) 11340a708f8fSGustavo F. Padovan { 11358c1d787bSGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 11360a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 11370a708f8fSGustavo F. Padovan int err = 0; 11380a708f8fSGustavo F. Padovan int timeo = HZ/5; 11390a708f8fSGustavo F. Padovan 11400a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 11418c1d787bSGustavo F. Padovan while ((chan->unacked_frames > 0 && chan->conn)) { 11420a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 11430a708f8fSGustavo F. Padovan 11440a708f8fSGustavo F. Padovan if (!timeo) 11450a708f8fSGustavo F. Padovan timeo = HZ/5; 11460a708f8fSGustavo F. Padovan 11470a708f8fSGustavo F. Padovan if (signal_pending(current)) { 11480a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 11490a708f8fSGustavo F. Padovan break; 11500a708f8fSGustavo F. Padovan } 11510a708f8fSGustavo F. Padovan 11520a708f8fSGustavo F. Padovan release_sock(sk); 11530a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 11540a708f8fSGustavo F. Padovan lock_sock(sk); 11550a708f8fSGustavo F. Padovan 11560a708f8fSGustavo F. Padovan err = sock_error(sk); 11570a708f8fSGustavo F. Padovan if (err) 11580a708f8fSGustavo F. Padovan break; 11590a708f8fSGustavo F. Padovan } 11600a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 11610a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 11620a708f8fSGustavo F. Padovan return err; 11630a708f8fSGustavo F. Padovan } 11640a708f8fSGustavo F. Padovan 11650a708f8fSGustavo F. Padovan static void l2cap_monitor_timeout(unsigned long arg) 11660a708f8fSGustavo F. Padovan { 1167525cd185SGustavo F. Padovan struct l2cap_chan *chan = (void *) arg; 1168525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 11690a708f8fSGustavo F. Padovan 1170525cd185SGustavo F. Padovan BT_DBG("chan %p", chan); 11710a708f8fSGustavo F. Padovan 11720a708f8fSGustavo F. Padovan bh_lock_sock(sk); 11732c03a7a4SGustavo F. Padovan if (chan->retry_count >= chan->remote_max_tx) { 11748c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); 11750a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 11760a708f8fSGustavo F. Padovan return; 11770a708f8fSGustavo F. Padovan } 11780a708f8fSGustavo F. Padovan 11796a026610SGustavo F. Padovan chan->retry_count++; 11800a708f8fSGustavo F. Padovan __mod_monitor_timer(); 11810a708f8fSGustavo F. Padovan 1182525cd185SGustavo F. Padovan l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); 11830a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 11840a708f8fSGustavo F. Padovan } 11850a708f8fSGustavo F. Padovan 11860a708f8fSGustavo F. Padovan static void l2cap_retrans_timeout(unsigned long arg) 11870a708f8fSGustavo F. Padovan { 1188525cd185SGustavo F. Padovan struct l2cap_chan *chan = (void *) arg; 1189525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 11900a708f8fSGustavo F. Padovan 119149208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 11920a708f8fSGustavo F. Padovan 11930a708f8fSGustavo F. Padovan bh_lock_sock(sk); 11946a026610SGustavo F. Padovan chan->retry_count = 1; 11950a708f8fSGustavo F. Padovan __mod_monitor_timer(); 11960a708f8fSGustavo F. Padovan 1197525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_WAIT_F; 11980a708f8fSGustavo F. Padovan 1199525cd185SGustavo F. Padovan l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); 12000a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 12010a708f8fSGustavo F. Padovan } 12020a708f8fSGustavo F. Padovan 120342e5c802SGustavo F. Padovan static void l2cap_drop_acked_frames(struct l2cap_chan *chan) 12040a708f8fSGustavo F. Padovan { 12050a708f8fSGustavo F. Padovan struct sk_buff *skb; 12060a708f8fSGustavo F. Padovan 120758d35f87SGustavo F. Padovan while ((skb = skb_peek(&chan->tx_q)) && 12086a026610SGustavo F. Padovan chan->unacked_frames) { 120942e5c802SGustavo F. Padovan if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) 12100a708f8fSGustavo F. Padovan break; 12110a708f8fSGustavo F. Padovan 121258d35f87SGustavo F. Padovan skb = skb_dequeue(&chan->tx_q); 12130a708f8fSGustavo F. Padovan kfree_skb(skb); 12140a708f8fSGustavo F. Padovan 12156a026610SGustavo F. Padovan chan->unacked_frames--; 12160a708f8fSGustavo F. Padovan } 12170a708f8fSGustavo F. Padovan 12186a026610SGustavo F. Padovan if (!chan->unacked_frames) 1219e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 12200a708f8fSGustavo F. Padovan } 12210a708f8fSGustavo F. Padovan 12224343478fSGustavo F. Padovan void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) 12230a708f8fSGustavo F. Padovan { 12248c1d787bSGustavo F. Padovan struct hci_conn *hcon = chan->conn->hcon; 12250a708f8fSGustavo F. Padovan u16 flags; 12260a708f8fSGustavo F. Padovan 12274343478fSGustavo F. Padovan BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len); 12280a708f8fSGustavo F. Padovan 12294343478fSGustavo F. Padovan if (!chan->flushable && lmp_no_flush_capable(hcon->hdev)) 12300a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 12310a708f8fSGustavo F. Padovan else 12320a708f8fSGustavo F. Padovan flags = ACL_START; 12330a708f8fSGustavo F. Padovan 123414b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = chan->force_active; 12350a708f8fSGustavo F. Padovan hci_send_acl(hcon, skb, flags); 12360a708f8fSGustavo F. Padovan } 12370a708f8fSGustavo F. Padovan 123842e5c802SGustavo F. Padovan void l2cap_streaming_send(struct l2cap_chan *chan) 12390a708f8fSGustavo F. Padovan { 12400a708f8fSGustavo F. Padovan struct sk_buff *skb; 12410a708f8fSGustavo F. Padovan u16 control, fcs; 12420a708f8fSGustavo F. Padovan 124358d35f87SGustavo F. Padovan while ((skb = skb_dequeue(&chan->tx_q))) { 12440a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); 124542e5c802SGustavo F. Padovan control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; 12460a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); 12470a708f8fSGustavo F. Padovan 124847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 12490a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, skb->len - 2); 12500a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + skb->len - 2); 12510a708f8fSGustavo F. Padovan } 12520a708f8fSGustavo F. Padovan 12534343478fSGustavo F. Padovan l2cap_do_send(chan, skb); 12540a708f8fSGustavo F. Padovan 125542e5c802SGustavo F. Padovan chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; 12560a708f8fSGustavo F. Padovan } 12570a708f8fSGustavo F. Padovan } 12580a708f8fSGustavo F. Padovan 1259525cd185SGustavo F. Padovan static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) 12600a708f8fSGustavo F. Padovan { 12610a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 12620a708f8fSGustavo F. Padovan u16 control, fcs; 12630a708f8fSGustavo F. Padovan 126458d35f87SGustavo F. Padovan skb = skb_peek(&chan->tx_q); 12650a708f8fSGustavo F. Padovan if (!skb) 12660a708f8fSGustavo F. Padovan return; 12670a708f8fSGustavo F. Padovan 12680a708f8fSGustavo F. Padovan do { 12690a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq == tx_seq) 12700a708f8fSGustavo F. Padovan break; 12710a708f8fSGustavo F. Padovan 127258d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 12730a708f8fSGustavo F. Padovan return; 12740a708f8fSGustavo F. Padovan 127558d35f87SGustavo F. Padovan } while ((skb = skb_queue_next(&chan->tx_q, skb))); 12760a708f8fSGustavo F. Padovan 12772c03a7a4SGustavo F. Padovan if (chan->remote_max_tx && 12782c03a7a4SGustavo F. Padovan bt_cb(skb)->retries == chan->remote_max_tx) { 12798c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); 12800a708f8fSGustavo F. Padovan return; 12810a708f8fSGustavo F. Padovan } 12820a708f8fSGustavo F. Padovan 12830a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 12840a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 12850a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 1286a429b519SRuiyi Zhang control &= L2CAP_CTRL_SAR; 12870a708f8fSGustavo F. Padovan 1288525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { 12890a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 1290525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; 12910a708f8fSGustavo F. Padovan } 12920a708f8fSGustavo F. Padovan 129342e5c802SGustavo F. Padovan control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 12940a708f8fSGustavo F. Padovan | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 12950a708f8fSGustavo F. Padovan 12960a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 12970a708f8fSGustavo F. Padovan 129847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 12990a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); 13000a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); 13010a708f8fSGustavo F. Padovan } 13020a708f8fSGustavo F. Padovan 13034343478fSGustavo F. Padovan l2cap_do_send(chan, tx_skb); 13040a708f8fSGustavo F. Padovan } 13050a708f8fSGustavo F. Padovan 1306525cd185SGustavo F. Padovan int l2cap_ertm_send(struct l2cap_chan *chan) 13070a708f8fSGustavo F. Padovan { 13080a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 13090a708f8fSGustavo F. Padovan u16 control, fcs; 13100a708f8fSGustavo F. Padovan int nsent = 0; 13110a708f8fSGustavo F. Padovan 131289bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 13130a708f8fSGustavo F. Padovan return -ENOTCONN; 13140a708f8fSGustavo F. Padovan 131558d35f87SGustavo F. Padovan while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { 13160a708f8fSGustavo F. Padovan 13172c03a7a4SGustavo F. Padovan if (chan->remote_max_tx && 13182c03a7a4SGustavo F. Padovan bt_cb(skb)->retries == chan->remote_max_tx) { 13198c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); 13200a708f8fSGustavo F. Padovan break; 13210a708f8fSGustavo F. Padovan } 13220a708f8fSGustavo F. Padovan 13230a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 13240a708f8fSGustavo F. Padovan 13250a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 13260a708f8fSGustavo F. Padovan 13270a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 13280a708f8fSGustavo F. Padovan control &= L2CAP_CTRL_SAR; 13290a708f8fSGustavo F. Padovan 1330525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { 13310a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 1332525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; 13330a708f8fSGustavo F. Padovan } 133442e5c802SGustavo F. Padovan control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 133542e5c802SGustavo F. Padovan | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 13360a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 13370a708f8fSGustavo F. Padovan 13380a708f8fSGustavo F. Padovan 133947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 13400a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); 13410a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); 13420a708f8fSGustavo F. Padovan } 13430a708f8fSGustavo F. Padovan 13444343478fSGustavo F. Padovan l2cap_do_send(chan, tx_skb); 13450a708f8fSGustavo F. Padovan 13460a708f8fSGustavo F. Padovan __mod_retrans_timer(); 13470a708f8fSGustavo F. Padovan 134842e5c802SGustavo F. Padovan bt_cb(skb)->tx_seq = chan->next_tx_seq; 134942e5c802SGustavo F. Padovan chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; 13500a708f8fSGustavo F. Padovan 135123e9fde2SSuraj Sumangala if (bt_cb(skb)->retries == 1) 13526a026610SGustavo F. Padovan chan->unacked_frames++; 135323e9fde2SSuraj Sumangala 13546a026610SGustavo F. Padovan chan->frames_sent++; 13550a708f8fSGustavo F. Padovan 135658d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 135758d35f87SGustavo F. Padovan chan->tx_send_head = NULL; 13580a708f8fSGustavo F. Padovan else 135958d35f87SGustavo F. Padovan chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); 13600a708f8fSGustavo F. Padovan 13610a708f8fSGustavo F. Padovan nsent++; 13620a708f8fSGustavo F. Padovan } 13630a708f8fSGustavo F. Padovan 13640a708f8fSGustavo F. Padovan return nsent; 13650a708f8fSGustavo F. Padovan } 13660a708f8fSGustavo F. Padovan 1367525cd185SGustavo F. Padovan static int l2cap_retransmit_frames(struct l2cap_chan *chan) 13680a708f8fSGustavo F. Padovan { 13690a708f8fSGustavo F. Padovan int ret; 13700a708f8fSGustavo F. Padovan 137158d35f87SGustavo F. Padovan if (!skb_queue_empty(&chan->tx_q)) 137258d35f87SGustavo F. Padovan chan->tx_send_head = chan->tx_q.next; 13730a708f8fSGustavo F. Padovan 137442e5c802SGustavo F. Padovan chan->next_tx_seq = chan->expected_ack_seq; 1375525cd185SGustavo F. Padovan ret = l2cap_ertm_send(chan); 13760a708f8fSGustavo F. Padovan return ret; 13770a708f8fSGustavo F. Padovan } 13780a708f8fSGustavo F. Padovan 1379525cd185SGustavo F. Padovan static void l2cap_send_ack(struct l2cap_chan *chan) 13800a708f8fSGustavo F. Padovan { 13810a708f8fSGustavo F. Padovan u16 control = 0; 13820a708f8fSGustavo F. Padovan 138342e5c802SGustavo F. Padovan control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 13840a708f8fSGustavo F. Padovan 1385525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 13860a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 1387525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 1388525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 13890a708f8fSGustavo F. Padovan return; 13900a708f8fSGustavo F. Padovan } 13910a708f8fSGustavo F. Padovan 1392525cd185SGustavo F. Padovan if (l2cap_ertm_send(chan) > 0) 13930a708f8fSGustavo F. Padovan return; 13940a708f8fSGustavo F. Padovan 13950a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 1396525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 13970a708f8fSGustavo F. Padovan } 13980a708f8fSGustavo F. Padovan 1399525cd185SGustavo F. Padovan static void l2cap_send_srejtail(struct l2cap_chan *chan) 14000a708f8fSGustavo F. Padovan { 14010a708f8fSGustavo F. Padovan struct srej_list *tail; 14020a708f8fSGustavo F. Padovan u16 control; 14030a708f8fSGustavo F. Padovan 14040a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 14050a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 14060a708f8fSGustavo F. Padovan 140739d5a3eeSGustavo F. Padovan tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); 14080a708f8fSGustavo F. Padovan control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 14090a708f8fSGustavo F. Padovan 1410525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 14110a708f8fSGustavo F. Padovan } 14120a708f8fSGustavo F. Padovan 14130a708f8fSGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) 14140a708f8fSGustavo F. Padovan { 14158c1d787bSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; 14160a708f8fSGustavo F. Padovan struct sk_buff **frag; 14170a708f8fSGustavo F. Padovan int err, sent = 0; 14180a708f8fSGustavo F. Padovan 14190a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) 14200a708f8fSGustavo F. Padovan return -EFAULT; 14210a708f8fSGustavo F. Padovan 14220a708f8fSGustavo F. Padovan sent += count; 14230a708f8fSGustavo F. Padovan len -= count; 14240a708f8fSGustavo F. Padovan 14250a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 14260a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 14270a708f8fSGustavo F. Padovan while (len) { 14280a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 14290a708f8fSGustavo F. Padovan 14300a708f8fSGustavo F. Padovan *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); 14310a708f8fSGustavo F. Padovan if (!*frag) 14320a708f8fSGustavo F. Padovan return err; 14330a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) 14340a708f8fSGustavo F. Padovan return -EFAULT; 14350a708f8fSGustavo F. Padovan 14360a708f8fSGustavo F. Padovan sent += count; 14370a708f8fSGustavo F. Padovan len -= count; 14380a708f8fSGustavo F. Padovan 14390a708f8fSGustavo F. Padovan frag = &(*frag)->next; 14400a708f8fSGustavo F. Padovan } 14410a708f8fSGustavo F. Padovan 14420a708f8fSGustavo F. Padovan return sent; 14430a708f8fSGustavo F. Padovan } 14440a708f8fSGustavo F. Padovan 1445fe4128e0SGustavo F. Padovan struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 14460a708f8fSGustavo F. Padovan { 1447fe4128e0SGustavo F. Padovan struct sock *sk = chan->sk; 14488c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 14490a708f8fSGustavo F. Padovan struct sk_buff *skb; 14500a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 14510a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 14520a708f8fSGustavo F. Padovan 14530a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 14540a708f8fSGustavo F. Padovan 14550a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 14560a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 14570a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 14580a708f8fSGustavo F. Padovan if (!skb) 14590a708f8fSGustavo F. Padovan return ERR_PTR(err); 14600a708f8fSGustavo F. Padovan 14610a708f8fSGustavo F. Padovan /* Create L2CAP header */ 14620a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 1463fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 14640a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 1465fe4128e0SGustavo F. Padovan put_unaligned_le16(chan->psm, skb_put(skb, 2)); 14660a708f8fSGustavo F. Padovan 14670a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 14680a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 14690a708f8fSGustavo F. Padovan kfree_skb(skb); 14700a708f8fSGustavo F. Padovan return ERR_PTR(err); 14710a708f8fSGustavo F. Padovan } 14720a708f8fSGustavo F. Padovan return skb; 14730a708f8fSGustavo F. Padovan } 14740a708f8fSGustavo F. Padovan 1475fe4128e0SGustavo F. Padovan struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 14760a708f8fSGustavo F. Padovan { 1477fe4128e0SGustavo F. Padovan struct sock *sk = chan->sk; 14788c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 14790a708f8fSGustavo F. Padovan struct sk_buff *skb; 14800a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE; 14810a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 14820a708f8fSGustavo F. Padovan 14830a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 14840a708f8fSGustavo F. Padovan 14850a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 14860a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 14870a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 14880a708f8fSGustavo F. Padovan if (!skb) 14890a708f8fSGustavo F. Padovan return ERR_PTR(err); 14900a708f8fSGustavo F. Padovan 14910a708f8fSGustavo F. Padovan /* Create L2CAP header */ 14920a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 1493fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 14940a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 14950a708f8fSGustavo F. Padovan 14960a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 14970a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 14980a708f8fSGustavo F. Padovan kfree_skb(skb); 14990a708f8fSGustavo F. Padovan return ERR_PTR(err); 15000a708f8fSGustavo F. Padovan } 15010a708f8fSGustavo F. Padovan return skb; 15020a708f8fSGustavo F. Padovan } 15030a708f8fSGustavo F. Padovan 150447d1ec61SGustavo F. Padovan struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen) 15050a708f8fSGustavo F. Padovan { 150647d1ec61SGustavo F. Padovan struct sock *sk = chan->sk; 15078c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 15080a708f8fSGustavo F. Padovan struct sk_buff *skb; 15090a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 15100a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 15110a708f8fSGustavo F. Padovan 15120a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 15130a708f8fSGustavo F. Padovan 15140a708f8fSGustavo F. Padovan if (!conn) 15150a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 15160a708f8fSGustavo F. Padovan 15170a708f8fSGustavo F. Padovan if (sdulen) 15180a708f8fSGustavo F. Padovan hlen += 2; 15190a708f8fSGustavo F. Padovan 152047d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 15210a708f8fSGustavo F. Padovan hlen += 2; 15220a708f8fSGustavo F. Padovan 15230a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 15240a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 15250a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 15260a708f8fSGustavo F. Padovan if (!skb) 15270a708f8fSGustavo F. Padovan return ERR_PTR(err); 15280a708f8fSGustavo F. Padovan 15290a708f8fSGustavo F. Padovan /* Create L2CAP header */ 15300a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 1531fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 15320a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 15330a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 15340a708f8fSGustavo F. Padovan if (sdulen) 15350a708f8fSGustavo F. Padovan put_unaligned_le16(sdulen, skb_put(skb, 2)); 15360a708f8fSGustavo F. Padovan 15370a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 15380a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 15390a708f8fSGustavo F. Padovan kfree_skb(skb); 15400a708f8fSGustavo F. Padovan return ERR_PTR(err); 15410a708f8fSGustavo F. Padovan } 15420a708f8fSGustavo F. Padovan 154347d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 15440a708f8fSGustavo F. Padovan put_unaligned_le16(0, skb_put(skb, 2)); 15450a708f8fSGustavo F. Padovan 15460a708f8fSGustavo F. Padovan bt_cb(skb)->retries = 0; 15470a708f8fSGustavo F. Padovan return skb; 15480a708f8fSGustavo F. Padovan } 15490a708f8fSGustavo F. Padovan 15502c03a7a4SGustavo F. Padovan int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 15510a708f8fSGustavo F. Padovan { 15520a708f8fSGustavo F. Padovan struct sk_buff *skb; 15530a708f8fSGustavo F. Padovan struct sk_buff_head sar_queue; 15540a708f8fSGustavo F. Padovan u16 control; 15550a708f8fSGustavo F. Padovan size_t size = 0; 15560a708f8fSGustavo F. Padovan 15570a708f8fSGustavo F. Padovan skb_queue_head_init(&sar_queue); 15580a708f8fSGustavo F. Padovan control = L2CAP_SDU_START; 155947d1ec61SGustavo F. Padovan skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); 15600a708f8fSGustavo F. Padovan if (IS_ERR(skb)) 15610a708f8fSGustavo F. Padovan return PTR_ERR(skb); 15620a708f8fSGustavo F. Padovan 15630a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 15642c03a7a4SGustavo F. Padovan len -= chan->remote_mps; 15652c03a7a4SGustavo F. Padovan size += chan->remote_mps; 15660a708f8fSGustavo F. Padovan 15670a708f8fSGustavo F. Padovan while (len > 0) { 15680a708f8fSGustavo F. Padovan size_t buflen; 15690a708f8fSGustavo F. Padovan 15702c03a7a4SGustavo F. Padovan if (len > chan->remote_mps) { 15710a708f8fSGustavo F. Padovan control = L2CAP_SDU_CONTINUE; 15722c03a7a4SGustavo F. Padovan buflen = chan->remote_mps; 15730a708f8fSGustavo F. Padovan } else { 15740a708f8fSGustavo F. Padovan control = L2CAP_SDU_END; 15750a708f8fSGustavo F. Padovan buflen = len; 15760a708f8fSGustavo F. Padovan } 15770a708f8fSGustavo F. Padovan 157847d1ec61SGustavo F. Padovan skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); 15790a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 15800a708f8fSGustavo F. Padovan skb_queue_purge(&sar_queue); 15810a708f8fSGustavo F. Padovan return PTR_ERR(skb); 15820a708f8fSGustavo F. Padovan } 15830a708f8fSGustavo F. Padovan 15840a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 15850a708f8fSGustavo F. Padovan len -= buflen; 15860a708f8fSGustavo F. Padovan size += buflen; 15870a708f8fSGustavo F. Padovan } 158858d35f87SGustavo F. Padovan skb_queue_splice_tail(&sar_queue, &chan->tx_q); 158958d35f87SGustavo F. Padovan if (chan->tx_send_head == NULL) 159058d35f87SGustavo F. Padovan chan->tx_send_head = sar_queue.next; 15910a708f8fSGustavo F. Padovan 15920a708f8fSGustavo F. Padovan return size; 15930a708f8fSGustavo F. Padovan } 15940a708f8fSGustavo F. Padovan 15959a91a04aSGustavo F. Padovan int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 15969a91a04aSGustavo F. Padovan { 15979a91a04aSGustavo F. Padovan struct sk_buff *skb; 15989a91a04aSGustavo F. Padovan u16 control; 15999a91a04aSGustavo F. Padovan int err; 16009a91a04aSGustavo F. Padovan 16019a91a04aSGustavo F. Padovan /* Connectionless channel */ 1602715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 16039a91a04aSGustavo F. Padovan skb = l2cap_create_connless_pdu(chan, msg, len); 16049a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 16059a91a04aSGustavo F. Padovan return PTR_ERR(skb); 16069a91a04aSGustavo F. Padovan 16079a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 16089a91a04aSGustavo F. Padovan return len; 16099a91a04aSGustavo F. Padovan } 16109a91a04aSGustavo F. Padovan 16119a91a04aSGustavo F. Padovan switch (chan->mode) { 16129a91a04aSGustavo F. Padovan case L2CAP_MODE_BASIC: 16139a91a04aSGustavo F. Padovan /* Check outgoing MTU */ 16149a91a04aSGustavo F. Padovan if (len > chan->omtu) 16159a91a04aSGustavo F. Padovan return -EMSGSIZE; 16169a91a04aSGustavo F. Padovan 16179a91a04aSGustavo F. Padovan /* Create a basic PDU */ 16189a91a04aSGustavo F. Padovan skb = l2cap_create_basic_pdu(chan, msg, len); 16199a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 16209a91a04aSGustavo F. Padovan return PTR_ERR(skb); 16219a91a04aSGustavo F. Padovan 16229a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 16239a91a04aSGustavo F. Padovan err = len; 16249a91a04aSGustavo F. Padovan break; 16259a91a04aSGustavo F. Padovan 16269a91a04aSGustavo F. Padovan case L2CAP_MODE_ERTM: 16279a91a04aSGustavo F. Padovan case L2CAP_MODE_STREAMING: 16289a91a04aSGustavo F. Padovan /* Entire SDU fits into one PDU */ 16299a91a04aSGustavo F. Padovan if (len <= chan->remote_mps) { 16309a91a04aSGustavo F. Padovan control = L2CAP_SDU_UNSEGMENTED; 16319a91a04aSGustavo F. Padovan skb = l2cap_create_iframe_pdu(chan, msg, len, control, 16329a91a04aSGustavo F. Padovan 0); 16339a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 16349a91a04aSGustavo F. Padovan return PTR_ERR(skb); 16359a91a04aSGustavo F. Padovan 16369a91a04aSGustavo F. Padovan __skb_queue_tail(&chan->tx_q, skb); 16379a91a04aSGustavo F. Padovan 16389a91a04aSGustavo F. Padovan if (chan->tx_send_head == NULL) 16399a91a04aSGustavo F. Padovan chan->tx_send_head = skb; 16409a91a04aSGustavo F. Padovan 16419a91a04aSGustavo F. Padovan } else { 16429a91a04aSGustavo F. Padovan /* Segment SDU into multiples PDUs */ 16439a91a04aSGustavo F. Padovan err = l2cap_sar_segment_sdu(chan, msg, len); 16449a91a04aSGustavo F. Padovan if (err < 0) 16459a91a04aSGustavo F. Padovan return err; 16469a91a04aSGustavo F. Padovan } 16479a91a04aSGustavo F. Padovan 16489a91a04aSGustavo F. Padovan if (chan->mode == L2CAP_MODE_STREAMING) { 16499a91a04aSGustavo F. Padovan l2cap_streaming_send(chan); 16509a91a04aSGustavo F. Padovan err = len; 16519a91a04aSGustavo F. Padovan break; 16529a91a04aSGustavo F. Padovan } 16539a91a04aSGustavo F. Padovan 16549a91a04aSGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && 16559a91a04aSGustavo F. Padovan (chan->conn_state & L2CAP_CONN_WAIT_F)) { 16569a91a04aSGustavo F. Padovan err = len; 16579a91a04aSGustavo F. Padovan break; 16589a91a04aSGustavo F. Padovan } 16599a91a04aSGustavo F. Padovan 16609a91a04aSGustavo F. Padovan err = l2cap_ertm_send(chan); 16619a91a04aSGustavo F. Padovan if (err >= 0) 16629a91a04aSGustavo F. Padovan err = len; 16639a91a04aSGustavo F. Padovan 16649a91a04aSGustavo F. Padovan break; 16659a91a04aSGustavo F. Padovan 16669a91a04aSGustavo F. Padovan default: 16679a91a04aSGustavo F. Padovan BT_DBG("bad state %1.1x", chan->mode); 16689a91a04aSGustavo F. Padovan err = -EBADFD; 16699a91a04aSGustavo F. Padovan } 16709a91a04aSGustavo F. Padovan 16719a91a04aSGustavo F. Padovan return err; 16729a91a04aSGustavo F. Padovan } 16739a91a04aSGustavo F. Padovan 16740a708f8fSGustavo F. Padovan static void l2cap_chan_ready(struct sock *sk) 16750a708f8fSGustavo F. Padovan { 16760a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 1677b4450035SGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 16780a708f8fSGustavo F. Padovan 16790a708f8fSGustavo F. Padovan BT_DBG("sk %p, parent %p", sk, parent); 16800a708f8fSGustavo F. Padovan 1681b4450035SGustavo F. Padovan chan->conf_state = 0; 1682ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 16830a708f8fSGustavo F. Padovan 16840a708f8fSGustavo F. Padovan if (!parent) { 16850a708f8fSGustavo F. Padovan /* Outgoing channel. 16860a708f8fSGustavo F. Padovan * Wake up socket sleeping on connect. 16870a708f8fSGustavo F. Padovan */ 168889bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECTED); 16890a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 16900a708f8fSGustavo F. Padovan } else { 16910a708f8fSGustavo F. Padovan /* Incoming channel. 16920a708f8fSGustavo F. Padovan * Wake up socket sleeping on accept. 16930a708f8fSGustavo F. Padovan */ 16940a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 16950a708f8fSGustavo F. Padovan } 16960a708f8fSGustavo F. Padovan } 16970a708f8fSGustavo F. Padovan 16980a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 16990a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 17000a708f8fSGustavo F. Padovan { 17010a708f8fSGustavo F. Padovan struct sk_buff *nskb; 170248454079SGustavo F. Padovan struct l2cap_chan *chan; 17030a708f8fSGustavo F. Padovan 17040a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 17050a708f8fSGustavo F. Padovan 1706baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 1707baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 170848454079SGustavo F. Padovan struct sock *sk = chan->sk; 1709715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_RAW) 17100a708f8fSGustavo F. Padovan continue; 17110a708f8fSGustavo F. Padovan 17120a708f8fSGustavo F. Padovan /* Don't send frame to the socket it came from */ 17130a708f8fSGustavo F. Padovan if (skb->sk == sk) 17140a708f8fSGustavo F. Padovan continue; 17150a708f8fSGustavo F. Padovan nskb = skb_clone(skb, GFP_ATOMIC); 17160a708f8fSGustavo F. Padovan if (!nskb) 17170a708f8fSGustavo F. Padovan continue; 17180a708f8fSGustavo F. Padovan 171923070494SGustavo F. Padovan if (chan->ops->recv(chan->data, nskb)) 17200a708f8fSGustavo F. Padovan kfree_skb(nskb); 17210a708f8fSGustavo F. Padovan } 1722baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 17230a708f8fSGustavo F. Padovan } 17240a708f8fSGustavo F. Padovan 17250a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 17260a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 17270a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data) 17280a708f8fSGustavo F. Padovan { 17290a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 17300a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 17310a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 17320a708f8fSGustavo F. Padovan int len, count; 17330a708f8fSGustavo F. Padovan 17340a708f8fSGustavo F. Padovan BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", 17350a708f8fSGustavo F. Padovan conn, code, ident, dlen); 17360a708f8fSGustavo F. Padovan 17370a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 17380a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 17390a708f8fSGustavo F. Padovan 17400a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 17410a708f8fSGustavo F. Padovan if (!skb) 17420a708f8fSGustavo F. Padovan return NULL; 17430a708f8fSGustavo F. Padovan 17440a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 17450a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 17463300d9a9SClaudio Takahasi 17473300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 17483300d9a9SClaudio Takahasi lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); 17493300d9a9SClaudio Takahasi else 17500a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); 17510a708f8fSGustavo F. Padovan 17520a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 17530a708f8fSGustavo F. Padovan cmd->code = code; 17540a708f8fSGustavo F. Padovan cmd->ident = ident; 17550a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 17560a708f8fSGustavo F. Padovan 17570a708f8fSGustavo F. Padovan if (dlen) { 17580a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 17590a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 17600a708f8fSGustavo F. Padovan data += count; 17610a708f8fSGustavo F. Padovan } 17620a708f8fSGustavo F. Padovan 17630a708f8fSGustavo F. Padovan len -= skb->len; 17640a708f8fSGustavo F. Padovan 17650a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 17660a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 17670a708f8fSGustavo F. Padovan while (len) { 17680a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 17690a708f8fSGustavo F. Padovan 17700a708f8fSGustavo F. Padovan *frag = bt_skb_alloc(count, GFP_ATOMIC); 17710a708f8fSGustavo F. Padovan if (!*frag) 17720a708f8fSGustavo F. Padovan goto fail; 17730a708f8fSGustavo F. Padovan 17740a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 17750a708f8fSGustavo F. Padovan 17760a708f8fSGustavo F. Padovan len -= count; 17770a708f8fSGustavo F. Padovan data += count; 17780a708f8fSGustavo F. Padovan 17790a708f8fSGustavo F. Padovan frag = &(*frag)->next; 17800a708f8fSGustavo F. Padovan } 17810a708f8fSGustavo F. Padovan 17820a708f8fSGustavo F. Padovan return skb; 17830a708f8fSGustavo F. Padovan 17840a708f8fSGustavo F. Padovan fail: 17850a708f8fSGustavo F. Padovan kfree_skb(skb); 17860a708f8fSGustavo F. Padovan return NULL; 17870a708f8fSGustavo F. Padovan } 17880a708f8fSGustavo F. Padovan 17890a708f8fSGustavo F. Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) 17900a708f8fSGustavo F. Padovan { 17910a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 17920a708f8fSGustavo F. Padovan int len; 17930a708f8fSGustavo F. Padovan 17940a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 17950a708f8fSGustavo F. Padovan *ptr += len; 17960a708f8fSGustavo F. Padovan 17970a708f8fSGustavo F. Padovan *type = opt->type; 17980a708f8fSGustavo F. Padovan *olen = opt->len; 17990a708f8fSGustavo F. Padovan 18000a708f8fSGustavo F. Padovan switch (opt->len) { 18010a708f8fSGustavo F. Padovan case 1: 18020a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 18030a708f8fSGustavo F. Padovan break; 18040a708f8fSGustavo F. Padovan 18050a708f8fSGustavo F. Padovan case 2: 18060a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 18070a708f8fSGustavo F. Padovan break; 18080a708f8fSGustavo F. Padovan 18090a708f8fSGustavo F. Padovan case 4: 18100a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 18110a708f8fSGustavo F. Padovan break; 18120a708f8fSGustavo F. Padovan 18130a708f8fSGustavo F. Padovan default: 18140a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 18150a708f8fSGustavo F. Padovan break; 18160a708f8fSGustavo F. Padovan } 18170a708f8fSGustavo F. Padovan 18180a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); 18190a708f8fSGustavo F. Padovan return len; 18200a708f8fSGustavo F. Padovan } 18210a708f8fSGustavo F. Padovan 18220a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 18230a708f8fSGustavo F. Padovan { 18240a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 18250a708f8fSGustavo F. Padovan 18260a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); 18270a708f8fSGustavo F. Padovan 18280a708f8fSGustavo F. Padovan opt->type = type; 18290a708f8fSGustavo F. Padovan opt->len = len; 18300a708f8fSGustavo F. Padovan 18310a708f8fSGustavo F. Padovan switch (len) { 18320a708f8fSGustavo F. Padovan case 1: 18330a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 18340a708f8fSGustavo F. Padovan break; 18350a708f8fSGustavo F. Padovan 18360a708f8fSGustavo F. Padovan case 2: 18370a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 18380a708f8fSGustavo F. Padovan break; 18390a708f8fSGustavo F. Padovan 18400a708f8fSGustavo F. Padovan case 4: 18410a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 18420a708f8fSGustavo F. Padovan break; 18430a708f8fSGustavo F. Padovan 18440a708f8fSGustavo F. Padovan default: 18450a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 18460a708f8fSGustavo F. Padovan break; 18470a708f8fSGustavo F. Padovan } 18480a708f8fSGustavo F. Padovan 18490a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 18500a708f8fSGustavo F. Padovan } 18510a708f8fSGustavo F. Padovan 18520a708f8fSGustavo F. Padovan static void l2cap_ack_timeout(unsigned long arg) 18530a708f8fSGustavo F. Padovan { 1854525cd185SGustavo F. Padovan struct l2cap_chan *chan = (void *) arg; 18550a708f8fSGustavo F. Padovan 1856525cd185SGustavo F. Padovan bh_lock_sock(chan->sk); 1857525cd185SGustavo F. Padovan l2cap_send_ack(chan); 1858525cd185SGustavo F. Padovan bh_unlock_sock(chan->sk); 18590a708f8fSGustavo F. Padovan } 18600a708f8fSGustavo F. Padovan 1861525cd185SGustavo F. Padovan static inline void l2cap_ertm_init(struct l2cap_chan *chan) 18620a708f8fSGustavo F. Padovan { 1863525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 1864525cd185SGustavo F. Padovan 186542e5c802SGustavo F. Padovan chan->expected_ack_seq = 0; 18666a026610SGustavo F. Padovan chan->unacked_frames = 0; 186742e5c802SGustavo F. Padovan chan->buffer_seq = 0; 18686a026610SGustavo F. Padovan chan->num_acked = 0; 18696a026610SGustavo F. Padovan chan->frames_sent = 0; 18700a708f8fSGustavo F. Padovan 1871e92c8e70SGustavo F. Padovan setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, 1872e92c8e70SGustavo F. Padovan (unsigned long) chan); 1873e92c8e70SGustavo F. Padovan setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, 1874e92c8e70SGustavo F. Padovan (unsigned long) chan); 1875e92c8e70SGustavo F. Padovan setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); 18760a708f8fSGustavo F. Padovan 1877f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->srej_q); 1878f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->busy_q); 18790a708f8fSGustavo F. Padovan 188039d5a3eeSGustavo F. Padovan INIT_LIST_HEAD(&chan->srej_l); 188139d5a3eeSGustavo F. Padovan 1882311bb895SGustavo F. Padovan INIT_WORK(&chan->busy_work, l2cap_busy_work); 18830a708f8fSGustavo F. Padovan 18840a708f8fSGustavo F. Padovan sk->sk_backlog_rcv = l2cap_ertm_data_rcv; 18850a708f8fSGustavo F. Padovan } 18860a708f8fSGustavo F. Padovan 18870a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 18880a708f8fSGustavo F. Padovan { 18890a708f8fSGustavo F. Padovan switch (mode) { 18900a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 18910a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 18920a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 18930a708f8fSGustavo F. Padovan return mode; 18940a708f8fSGustavo F. Padovan /* fall through */ 18950a708f8fSGustavo F. Padovan default: 18960a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 18970a708f8fSGustavo F. Padovan } 18980a708f8fSGustavo F. Padovan } 18990a708f8fSGustavo F. Padovan 1900710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 19010a708f8fSGustavo F. Padovan { 19020a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 19030c1bc5c6SGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = chan->mode }; 19040a708f8fSGustavo F. Padovan void *ptr = req->data; 19050a708f8fSGustavo F. Padovan 190649208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 19070a708f8fSGustavo F. Padovan 190873ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 19090a708f8fSGustavo F. Padovan goto done; 19100a708f8fSGustavo F. Padovan 19110c1bc5c6SGustavo F. Padovan switch (chan->mode) { 19120a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 19130a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 1914b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_STATE2_DEVICE) 19150a708f8fSGustavo F. Padovan break; 19160a708f8fSGustavo F. Padovan 19170a708f8fSGustavo F. Padovan /* fall through */ 19180a708f8fSGustavo F. Padovan default: 19198c1d787bSGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); 19200a708f8fSGustavo F. Padovan break; 19210a708f8fSGustavo F. Padovan } 19220a708f8fSGustavo F. Padovan 19230a708f8fSGustavo F. Padovan done: 19240c1bc5c6SGustavo F. Padovan if (chan->imtu != L2CAP_DEFAULT_MTU) 19250c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 19260a708f8fSGustavo F. Padovan 19270c1bc5c6SGustavo F. Padovan switch (chan->mode) { 19280a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 19298c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && 19308c1d787bSGustavo F. Padovan !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) 19310a708f8fSGustavo F. Padovan break; 19320a708f8fSGustavo F. Padovan 19330a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 19340a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 19350a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 19360a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 19370a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 19380a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 19390a708f8fSGustavo F. Padovan 19400a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 19410a708f8fSGustavo F. Padovan (unsigned long) &rfc); 19420a708f8fSGustavo F. Padovan break; 19430a708f8fSGustavo F. Padovan 19440a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 19450a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 194647d1ec61SGustavo F. Padovan rfc.txwin_size = chan->tx_win; 194747d1ec61SGustavo F. Padovan rfc.max_transmit = chan->max_tx; 19480a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 19490a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 19500a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 19518c1d787bSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) 19528c1d787bSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); 19530a708f8fSGustavo F. Padovan 19540a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 19550a708f8fSGustavo F. Padovan (unsigned long) &rfc); 19560a708f8fSGustavo F. Padovan 19578c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) 19580a708f8fSGustavo F. Padovan break; 19590a708f8fSGustavo F. Padovan 196047d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 1961b4450035SGustavo F. Padovan chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { 196247d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 196347d1ec61SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); 19640a708f8fSGustavo F. Padovan } 19650a708f8fSGustavo F. Padovan break; 19660a708f8fSGustavo F. Padovan 19670a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 19680a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 19690a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 19700a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 19710a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 19720a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 19730a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 19748c1d787bSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) 19758c1d787bSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); 19760a708f8fSGustavo F. Padovan 19770a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 19780a708f8fSGustavo F. Padovan (unsigned long) &rfc); 19790a708f8fSGustavo F. Padovan 19808c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) 19810a708f8fSGustavo F. Padovan break; 19820a708f8fSGustavo F. Padovan 198347d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 1984b4450035SGustavo F. Padovan chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { 198547d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 198647d1ec61SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); 19870a708f8fSGustavo F. Padovan } 19880a708f8fSGustavo F. Padovan break; 19890a708f8fSGustavo F. Padovan } 19900a708f8fSGustavo F. Padovan 1991fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 19920a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0); 19930a708f8fSGustavo F. Padovan 19940a708f8fSGustavo F. Padovan return ptr - data; 19950a708f8fSGustavo F. Padovan } 19960a708f8fSGustavo F. Padovan 199773ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 19980a708f8fSGustavo F. Padovan { 19990a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 20000a708f8fSGustavo F. Padovan void *ptr = rsp->data; 200173ffa904SGustavo F. Padovan void *req = chan->conf_req; 200273ffa904SGustavo F. Padovan int len = chan->conf_len; 20030a708f8fSGustavo F. Padovan int type, hint, olen; 20040a708f8fSGustavo F. Padovan unsigned long val; 20050a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 20060a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 20070a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 20080a708f8fSGustavo F. Padovan 200973ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 20100a708f8fSGustavo F. Padovan 20110a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 20120a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 20130a708f8fSGustavo F. Padovan 20140a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 20150a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 20160a708f8fSGustavo F. Padovan 20170a708f8fSGustavo F. Padovan switch (type) { 20180a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 20190a708f8fSGustavo F. Padovan mtu = val; 20200a708f8fSGustavo F. Padovan break; 20210a708f8fSGustavo F. Padovan 20220a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 20230c1bc5c6SGustavo F. Padovan chan->flush_to = val; 20240a708f8fSGustavo F. Padovan break; 20250a708f8fSGustavo F. Padovan 20260a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 20270a708f8fSGustavo F. Padovan break; 20280a708f8fSGustavo F. Padovan 20290a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 20300a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 20310a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 20320a708f8fSGustavo F. Padovan break; 20330a708f8fSGustavo F. Padovan 20340a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 20350a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 2036b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_NO_FCS_RECV; 20370a708f8fSGustavo F. Padovan 20380a708f8fSGustavo F. Padovan break; 20390a708f8fSGustavo F. Padovan 20400a708f8fSGustavo F. Padovan default: 20410a708f8fSGustavo F. Padovan if (hint) 20420a708f8fSGustavo F. Padovan break; 20430a708f8fSGustavo F. Padovan 20440a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 20450a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 20460a708f8fSGustavo F. Padovan break; 20470a708f8fSGustavo F. Padovan } 20480a708f8fSGustavo F. Padovan } 20490a708f8fSGustavo F. Padovan 205073ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 20510a708f8fSGustavo F. Padovan goto done; 20520a708f8fSGustavo F. Padovan 20530c1bc5c6SGustavo F. Padovan switch (chan->mode) { 20540a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 20550a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 2056b4450035SGustavo F. Padovan if (!(chan->conf_state & L2CAP_CONF_STATE2_DEVICE)) { 20570c1bc5c6SGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, 20588c1d787bSGustavo F. Padovan chan->conn->feat_mask); 20590a708f8fSGustavo F. Padovan break; 20600a708f8fSGustavo F. Padovan } 20610a708f8fSGustavo F. Padovan 20620c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) 20630a708f8fSGustavo F. Padovan return -ECONNREFUSED; 20640a708f8fSGustavo F. Padovan 20650a708f8fSGustavo F. Padovan break; 20660a708f8fSGustavo F. Padovan } 20670a708f8fSGustavo F. Padovan 20680a708f8fSGustavo F. Padovan done: 20690c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) { 20700a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 20710c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 20720a708f8fSGustavo F. Padovan 207373ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 20740a708f8fSGustavo F. Padovan return -ECONNREFUSED; 20750a708f8fSGustavo F. Padovan 20760a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 20770a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 20780a708f8fSGustavo F. Padovan } 20790a708f8fSGustavo F. Padovan 20800a708f8fSGustavo F. Padovan 20810a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 20820a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 20830a708f8fSGustavo F. Padovan * which ones we don't like. */ 20840a708f8fSGustavo F. Padovan 20850a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 20860a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 20870a708f8fSGustavo F. Padovan else { 20880c1bc5c6SGustavo F. Padovan chan->omtu = mtu; 2089b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_MTU_DONE; 20900a708f8fSGustavo F. Padovan } 20910c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); 20920a708f8fSGustavo F. Padovan 20930a708f8fSGustavo F. Padovan switch (rfc.mode) { 20940a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 209547d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 2096b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_MODE_DONE; 20970a708f8fSGustavo F. Padovan break; 20980a708f8fSGustavo F. Padovan 20990a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 21002c03a7a4SGustavo F. Padovan chan->remote_tx_win = rfc.txwin_size; 21012c03a7a4SGustavo F. Padovan chan->remote_max_tx = rfc.max_transmit; 21020a708f8fSGustavo F. Padovan 21038c1d787bSGustavo F. Padovan if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) 21048c1d787bSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); 21050a708f8fSGustavo F. Padovan 21062c03a7a4SGustavo F. Padovan chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); 21070a708f8fSGustavo F. Padovan 21080a708f8fSGustavo F. Padovan rfc.retrans_timeout = 21090a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); 21100a708f8fSGustavo F. Padovan rfc.monitor_timeout = 21110a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); 21120a708f8fSGustavo F. Padovan 2113b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_MODE_DONE; 21140a708f8fSGustavo F. Padovan 21150a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 21160a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 21170a708f8fSGustavo F. Padovan 21180a708f8fSGustavo F. Padovan break; 21190a708f8fSGustavo F. Padovan 21200a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 21218c1d787bSGustavo F. Padovan if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) 21228c1d787bSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); 21230a708f8fSGustavo F. Padovan 21242c03a7a4SGustavo F. Padovan chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); 21250a708f8fSGustavo F. Padovan 2126b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_MODE_DONE; 21270a708f8fSGustavo F. Padovan 21280a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 21290a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 21300a708f8fSGustavo F. Padovan 21310a708f8fSGustavo F. Padovan break; 21320a708f8fSGustavo F. Padovan 21330a708f8fSGustavo F. Padovan default: 21340a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 21350a708f8fSGustavo F. Padovan 21360a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 21370c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 21380a708f8fSGustavo F. Padovan } 21390a708f8fSGustavo F. Padovan 21400a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 2141b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_OUTPUT_DONE; 21420a708f8fSGustavo F. Padovan } 2143fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 21440a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 21450a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(0x0000); 21460a708f8fSGustavo F. Padovan 21470a708f8fSGustavo F. Padovan return ptr - data; 21480a708f8fSGustavo F. Padovan } 21490a708f8fSGustavo F. Padovan 2150b4450035SGustavo F. Padovan static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) 21510a708f8fSGustavo F. Padovan { 21520a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 21530a708f8fSGustavo F. Padovan void *ptr = req->data; 21540a708f8fSGustavo F. Padovan int type, olen; 21550a708f8fSGustavo F. Padovan unsigned long val; 21560a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 21570a708f8fSGustavo F. Padovan 2158fe4128e0SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); 21590a708f8fSGustavo F. Padovan 21600a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 21610a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 21620a708f8fSGustavo F. Padovan 21630a708f8fSGustavo F. Padovan switch (type) { 21640a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 21650a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 21660a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 21670c1bc5c6SGustavo F. Padovan chan->imtu = L2CAP_DEFAULT_MIN_MTU; 21680a708f8fSGustavo F. Padovan } else 21690c1bc5c6SGustavo F. Padovan chan->imtu = val; 21700c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 21710a708f8fSGustavo F. Padovan break; 21720a708f8fSGustavo F. Padovan 21730a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 21740c1bc5c6SGustavo F. Padovan chan->flush_to = val; 21750a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 21760c1bc5c6SGustavo F. Padovan 2, chan->flush_to); 21770a708f8fSGustavo F. Padovan break; 21780a708f8fSGustavo F. Padovan 21790a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 21800a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 21810a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 21820a708f8fSGustavo F. Padovan 2183b4450035SGustavo F. Padovan if ((chan->conf_state & L2CAP_CONF_STATE2_DEVICE) && 21840c1bc5c6SGustavo F. Padovan rfc.mode != chan->mode) 21850a708f8fSGustavo F. Padovan return -ECONNREFUSED; 21860a708f8fSGustavo F. Padovan 218747d1ec61SGustavo F. Padovan chan->fcs = 0; 21880a708f8fSGustavo F. Padovan 21890a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 21900a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 21910a708f8fSGustavo F. Padovan break; 21920a708f8fSGustavo F. Padovan } 21930a708f8fSGustavo F. Padovan } 21940a708f8fSGustavo F. Padovan 21950c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) 21960a708f8fSGustavo F. Padovan return -ECONNREFUSED; 21970a708f8fSGustavo F. Padovan 21980c1bc5c6SGustavo F. Padovan chan->mode = rfc.mode; 21990a708f8fSGustavo F. Padovan 22000a708f8fSGustavo F. Padovan if (*result == L2CAP_CONF_SUCCESS) { 22010a708f8fSGustavo F. Padovan switch (rfc.mode) { 22020a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 220347d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 220447d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 220547d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 22060a708f8fSGustavo F. Padovan break; 22070a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 220847d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 22090a708f8fSGustavo F. Padovan } 22100a708f8fSGustavo F. Padovan } 22110a708f8fSGustavo F. Padovan 2212fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 22130a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0x0000); 22140a708f8fSGustavo F. Padovan 22150a708f8fSGustavo F. Padovan return ptr - data; 22160a708f8fSGustavo F. Padovan } 22170a708f8fSGustavo F. Padovan 2218fe4128e0SGustavo F. Padovan static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) 22190a708f8fSGustavo F. Padovan { 22200a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 22210a708f8fSGustavo F. Padovan void *ptr = rsp->data; 22220a708f8fSGustavo F. Padovan 2223fe4128e0SGustavo F. Padovan BT_DBG("chan %p", chan); 22240a708f8fSGustavo F. Padovan 2225fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 22260a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 22270a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 22280a708f8fSGustavo F. Padovan 22290a708f8fSGustavo F. Padovan return ptr - data; 22300a708f8fSGustavo F. Padovan } 22310a708f8fSGustavo F. Padovan 22328c1d787bSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) 2233710f9b0aSGustavo F. Padovan { 2234710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 22358c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 2236710f9b0aSGustavo F. Padovan u8 buf[128]; 2237710f9b0aSGustavo F. Padovan 2238fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 2239fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 2240710f9b0aSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 2241710f9b0aSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 2242710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 2243710f9b0aSGustavo F. Padovan L2CAP_CONN_RSP, sizeof(rsp), &rsp); 2244710f9b0aSGustavo F. Padovan 2245b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_REQ_SENT) 2246710f9b0aSGustavo F. Padovan return; 2247710f9b0aSGustavo F. Padovan 2248b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 2249710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 2250710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 2251710f9b0aSGustavo F. Padovan chan->num_conf_req++; 2252710f9b0aSGustavo F. Padovan } 2253710f9b0aSGustavo F. Padovan 225447d1ec61SGustavo F. Padovan static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) 22550a708f8fSGustavo F. Padovan { 22560a708f8fSGustavo F. Padovan int type, olen; 22570a708f8fSGustavo F. Padovan unsigned long val; 22580a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 22590a708f8fSGustavo F. Padovan 226047d1ec61SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); 22610a708f8fSGustavo F. Padovan 22620c1bc5c6SGustavo F. Padovan if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) 22630a708f8fSGustavo F. Padovan return; 22640a708f8fSGustavo F. Padovan 22650a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 22660a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 22670a708f8fSGustavo F. Padovan 22680a708f8fSGustavo F. Padovan switch (type) { 22690a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 22700a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 22710a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 22720a708f8fSGustavo F. Padovan goto done; 22730a708f8fSGustavo F. Padovan } 22740a708f8fSGustavo F. Padovan } 22750a708f8fSGustavo F. Padovan 22760a708f8fSGustavo F. Padovan done: 22770a708f8fSGustavo F. Padovan switch (rfc.mode) { 22780a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 227947d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 228047d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 228147d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 22820a708f8fSGustavo F. Padovan break; 22830a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 228447d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 22850a708f8fSGustavo F. Padovan } 22860a708f8fSGustavo F. Padovan } 22870a708f8fSGustavo F. Padovan 22880a708f8fSGustavo F. Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 22890a708f8fSGustavo F. Padovan { 22900a708f8fSGustavo F. Padovan struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; 22910a708f8fSGustavo F. Padovan 22920a708f8fSGustavo F. Padovan if (rej->reason != 0x0000) 22930a708f8fSGustavo F. Padovan return 0; 22940a708f8fSGustavo F. Padovan 22950a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 22960a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 22970a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 22980a708f8fSGustavo F. Padovan 22990a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 23000a708f8fSGustavo F. Padovan conn->info_ident = 0; 23010a708f8fSGustavo F. Padovan 23020a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 23030a708f8fSGustavo F. Padovan } 23040a708f8fSGustavo F. Padovan 23050a708f8fSGustavo F. Padovan return 0; 23060a708f8fSGustavo F. Padovan } 23070a708f8fSGustavo F. Padovan 23080a708f8fSGustavo F. Padovan static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 23090a708f8fSGustavo F. Padovan { 23100a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 23110a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 231223691d75SGustavo F. Padovan struct l2cap_chan *chan = NULL, *pchan; 23130a708f8fSGustavo F. Padovan struct sock *parent, *sk = NULL; 23140a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 23150a708f8fSGustavo F. Padovan 23160a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 23170a708f8fSGustavo F. Padovan __le16 psm = req->psm; 23180a708f8fSGustavo F. Padovan 23190a708f8fSGustavo F. Padovan BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); 23200a708f8fSGustavo F. Padovan 23210a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 232223691d75SGustavo F. Padovan pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); 232323691d75SGustavo F. Padovan if (!pchan) { 23240a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 23250a708f8fSGustavo F. Padovan goto sendresp; 23260a708f8fSGustavo F. Padovan } 23270a708f8fSGustavo F. Padovan 232823691d75SGustavo F. Padovan parent = pchan->sk; 232923691d75SGustavo F. Padovan 23300a708f8fSGustavo F. Padovan bh_lock_sock(parent); 23310a708f8fSGustavo F. Padovan 23320a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 23330a708f8fSGustavo F. Padovan if (psm != cpu_to_le16(0x0001) && 23340a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 23350a708f8fSGustavo F. Padovan conn->disc_reason = 0x05; 23360a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 23370a708f8fSGustavo F. Padovan goto response; 23380a708f8fSGustavo F. Padovan } 23390a708f8fSGustavo F. Padovan 23400a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 23410a708f8fSGustavo F. Padovan 23420a708f8fSGustavo F. Padovan /* Check for backlog size */ 23430a708f8fSGustavo F. Padovan if (sk_acceptq_is_full(parent)) { 23440a708f8fSGustavo F. Padovan BT_DBG("backlog full %d", parent->sk_ack_backlog); 23450a708f8fSGustavo F. Padovan goto response; 23460a708f8fSGustavo F. Padovan } 23470a708f8fSGustavo F. Padovan 234880808e43SGustavo F. Padovan chan = pchan->ops->new_connection(pchan->data); 234980808e43SGustavo F. Padovan if (!chan) 23500a708f8fSGustavo F. Padovan goto response; 23510a708f8fSGustavo F. Padovan 235280808e43SGustavo F. Padovan sk = chan->sk; 235380808e43SGustavo F. Padovan 2354baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 23550a708f8fSGustavo F. Padovan 23560a708f8fSGustavo F. Padovan /* Check if we already have channel with that dcid */ 2357baa7e1faSGustavo F. Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) { 2358baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 23590a708f8fSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 2360ba3bd0eeSGustavo F. Padovan chan->ops->close(chan->data); 23610a708f8fSGustavo F. Padovan goto response; 23620a708f8fSGustavo F. Padovan } 23630a708f8fSGustavo F. Padovan 23640a708f8fSGustavo F. Padovan hci_conn_hold(conn->hcon); 23650a708f8fSGustavo F. Padovan 23660a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->src, conn->src); 23670a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->dst, conn->dst); 2368fe4128e0SGustavo F. Padovan chan->psm = psm; 2369fe4128e0SGustavo F. Padovan chan->dcid = scid; 23700a708f8fSGustavo F. Padovan 2371d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 2372d1010240SGustavo F. Padovan 237348454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 237448454079SGustavo F. Padovan 2375fe4128e0SGustavo F. Padovan dcid = chan->scid; 23760a708f8fSGustavo F. Padovan 2377ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, sk->sk_sndtimeo); 23780a708f8fSGustavo F. Padovan 2379fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 23800a708f8fSGustavo F. Padovan 23810a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 23824343478fSGustavo F. Padovan if (l2cap_check_security(chan)) { 23830a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 238489bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECT2); 23850a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 23860a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 23870a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 23880a708f8fSGustavo F. Padovan } else { 238989bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 23900a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 23910a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 23920a708f8fSGustavo F. Padovan } 23930a708f8fSGustavo F. Padovan } else { 239489bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECT2); 23950a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 23960a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 23970a708f8fSGustavo F. Padovan } 23980a708f8fSGustavo F. Padovan } else { 239989bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECT2); 24000a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 24010a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 24020a708f8fSGustavo F. Padovan } 24030a708f8fSGustavo F. Padovan 2404baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 24050a708f8fSGustavo F. Padovan 24060a708f8fSGustavo F. Padovan response: 24070a708f8fSGustavo F. Padovan bh_unlock_sock(parent); 24080a708f8fSGustavo F. Padovan 24090a708f8fSGustavo F. Padovan sendresp: 24100a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 24110a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 24120a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 24130a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 24140a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); 24150a708f8fSGustavo F. Padovan 24160a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 24170a708f8fSGustavo F. Padovan struct l2cap_info_req info; 24180a708f8fSGustavo F. Padovan info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 24190a708f8fSGustavo F. Padovan 24200a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 24210a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 24220a708f8fSGustavo F. Padovan 24230a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 24240a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 24250a708f8fSGustavo F. Padovan 24260a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 24270a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(info), &info); 24280a708f8fSGustavo F. Padovan } 24290a708f8fSGustavo F. Padovan 2430b4450035SGustavo F. Padovan if (chan && !(chan->conf_state & L2CAP_CONF_REQ_SENT) && 24310a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 24320a708f8fSGustavo F. Padovan u8 buf[128]; 2433b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 24340a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 243573ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 243673ffa904SGustavo F. Padovan chan->num_conf_req++; 24370a708f8fSGustavo F. Padovan } 24380a708f8fSGustavo F. Padovan 24390a708f8fSGustavo F. Padovan return 0; 24400a708f8fSGustavo F. Padovan } 24410a708f8fSGustavo F. Padovan 24420a708f8fSGustavo F. Padovan static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24430a708f8fSGustavo F. Padovan { 24440a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 24450a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 244648454079SGustavo F. Padovan struct l2cap_chan *chan; 24470a708f8fSGustavo F. Padovan struct sock *sk; 24480a708f8fSGustavo F. Padovan u8 req[128]; 24490a708f8fSGustavo F. Padovan 24500a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 24510a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 24520a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 24530a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 24540a708f8fSGustavo F. Padovan 24550a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); 24560a708f8fSGustavo F. Padovan 24570a708f8fSGustavo F. Padovan if (scid) { 2458baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 245948454079SGustavo F. Padovan if (!chan) 24600a708f8fSGustavo F. Padovan return -EFAULT; 24610a708f8fSGustavo F. Padovan } else { 2462baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_ident(conn, cmd->ident); 246348454079SGustavo F. Padovan if (!chan) 24640a708f8fSGustavo F. Padovan return -EFAULT; 24650a708f8fSGustavo F. Padovan } 24660a708f8fSGustavo F. Padovan 246748454079SGustavo F. Padovan sk = chan->sk; 246848454079SGustavo F. Padovan 24690a708f8fSGustavo F. Padovan switch (result) { 24700a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 247189bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 2472fc7f8a7eSGustavo F. Padovan chan->ident = 0; 2473fe4128e0SGustavo F. Padovan chan->dcid = dcid; 2474b4450035SGustavo F. Padovan chan->conf_state &= ~L2CAP_CONF_CONNECT_PEND; 24750a708f8fSGustavo F. Padovan 2476b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_REQ_SENT) 24770a708f8fSGustavo F. Padovan break; 24780a708f8fSGustavo F. Padovan 2479b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 24800a708f8fSGustavo F. Padovan 24810a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 248273ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 248373ffa904SGustavo F. Padovan chan->num_conf_req++; 24840a708f8fSGustavo F. Padovan break; 24850a708f8fSGustavo F. Padovan 24860a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 2487b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_CONNECT_PEND; 24880a708f8fSGustavo F. Padovan break; 24890a708f8fSGustavo F. Padovan 24900a708f8fSGustavo F. Padovan default: 24910a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 24920a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 249389bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_DISCONN); 2494ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 2495ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 5); 24960a708f8fSGustavo F. Padovan break; 24970a708f8fSGustavo F. Padovan } 24980a708f8fSGustavo F. Padovan 249948454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 25000a708f8fSGustavo F. Padovan break; 25010a708f8fSGustavo F. Padovan } 25020a708f8fSGustavo F. Padovan 25030a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 25040a708f8fSGustavo F. Padovan return 0; 25050a708f8fSGustavo F. Padovan } 25060a708f8fSGustavo F. Padovan 250747d1ec61SGustavo F. Padovan static inline void set_default_fcs(struct l2cap_chan *chan) 25080a708f8fSGustavo F. Padovan { 250947d1ec61SGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(chan->sk); 251047d1ec61SGustavo F. Padovan 25110a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 25120a708f8fSGustavo F. Padovan * sides request it. 25130a708f8fSGustavo F. Padovan */ 25140c1bc5c6SGustavo F. Padovan if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) 251547d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 2516b4450035SGustavo F. Padovan else if (!(pi->chan->conf_state & L2CAP_CONF_NO_FCS_RECV)) 251747d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_CRC16; 25180a708f8fSGustavo F. Padovan } 25190a708f8fSGustavo F. Padovan 25200a708f8fSGustavo F. Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 25210a708f8fSGustavo F. Padovan { 25220a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 25230a708f8fSGustavo F. Padovan u16 dcid, flags; 25240a708f8fSGustavo F. Padovan u8 rsp[64]; 252548454079SGustavo F. Padovan struct l2cap_chan *chan; 25260a708f8fSGustavo F. Padovan struct sock *sk; 25270a708f8fSGustavo F. Padovan int len; 25280a708f8fSGustavo F. Padovan 25290a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 25300a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 25310a708f8fSGustavo F. Padovan 25320a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 25330a708f8fSGustavo F. Padovan 2534baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 253548454079SGustavo F. Padovan if (!chan) 25360a708f8fSGustavo F. Padovan return -ENOENT; 25370a708f8fSGustavo F. Padovan 253848454079SGustavo F. Padovan sk = chan->sk; 253948454079SGustavo F. Padovan 254089bc500eSGustavo F. Padovan if (chan->state != BT_CONFIG) { 25410a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 25420a708f8fSGustavo F. Padovan 25430a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0x0002); 25440a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 25450a708f8fSGustavo F. Padovan sizeof(rej), &rej); 25460a708f8fSGustavo F. Padovan goto unlock; 25470a708f8fSGustavo F. Padovan } 25480a708f8fSGustavo F. Padovan 25490a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 25500a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 255173ffa904SGustavo F. Padovan if (chan->conf_len + len > sizeof(chan->conf_req)) { 25520a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 2553fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 25540a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 25550a708f8fSGustavo F. Padovan goto unlock; 25560a708f8fSGustavo F. Padovan } 25570a708f8fSGustavo F. Padovan 25580a708f8fSGustavo F. Padovan /* Store config. */ 255973ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 256073ffa904SGustavo F. Padovan chan->conf_len += len; 25610a708f8fSGustavo F. Padovan 25620a708f8fSGustavo F. Padovan if (flags & 0x0001) { 25630a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 25640a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 2565fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 25660a708f8fSGustavo F. Padovan L2CAP_CONF_SUCCESS, 0x0001), rsp); 25670a708f8fSGustavo F. Padovan goto unlock; 25680a708f8fSGustavo F. Padovan } 25690a708f8fSGustavo F. Padovan 25700a708f8fSGustavo F. Padovan /* Complete config. */ 257173ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 25720a708f8fSGustavo F. Padovan if (len < 0) { 2573e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 25740a708f8fSGustavo F. Padovan goto unlock; 25750a708f8fSGustavo F. Padovan } 25760a708f8fSGustavo F. Padovan 25770a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 257873ffa904SGustavo F. Padovan chan->num_conf_rsp++; 25790a708f8fSGustavo F. Padovan 25800a708f8fSGustavo F. Padovan /* Reset config buffer. */ 258173ffa904SGustavo F. Padovan chan->conf_len = 0; 25820a708f8fSGustavo F. Padovan 2583b4450035SGustavo F. Padovan if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE)) 25840a708f8fSGustavo F. Padovan goto unlock; 25850a708f8fSGustavo F. Padovan 2586b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_INPUT_DONE) { 258747d1ec61SGustavo F. Padovan set_default_fcs(chan); 25880a708f8fSGustavo F. Padovan 258989bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECTED); 25900a708f8fSGustavo F. Padovan 259142e5c802SGustavo F. Padovan chan->next_tx_seq = 0; 259242e5c802SGustavo F. Padovan chan->expected_tx_seq = 0; 259358d35f87SGustavo F. Padovan skb_queue_head_init(&chan->tx_q); 25940c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) 2595525cd185SGustavo F. Padovan l2cap_ertm_init(chan); 25960a708f8fSGustavo F. Padovan 25970a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 25980a708f8fSGustavo F. Padovan goto unlock; 25990a708f8fSGustavo F. Padovan } 26000a708f8fSGustavo F. Padovan 2601b4450035SGustavo F. Padovan if (!(chan->conf_state & L2CAP_CONF_REQ_SENT)) { 26020a708f8fSGustavo F. Padovan u8 buf[64]; 2603b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 26040a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 260573ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 260673ffa904SGustavo F. Padovan chan->num_conf_req++; 26070a708f8fSGustavo F. Padovan } 26080a708f8fSGustavo F. Padovan 26090a708f8fSGustavo F. Padovan unlock: 26100a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 26110a708f8fSGustavo F. Padovan return 0; 26120a708f8fSGustavo F. Padovan } 26130a708f8fSGustavo F. Padovan 26140a708f8fSGustavo F. Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 26150a708f8fSGustavo F. Padovan { 26160a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 26170a708f8fSGustavo F. Padovan u16 scid, flags, result; 261848454079SGustavo F. Padovan struct l2cap_chan *chan; 26190a708f8fSGustavo F. Padovan struct sock *sk; 26200a708f8fSGustavo F. Padovan int len = cmd->len - sizeof(*rsp); 26210a708f8fSGustavo F. Padovan 26220a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 26230a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 26240a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 26250a708f8fSGustavo F. Padovan 26260a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", 26270a708f8fSGustavo F. Padovan scid, flags, result); 26280a708f8fSGustavo F. Padovan 2629baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 263048454079SGustavo F. Padovan if (!chan) 26310a708f8fSGustavo F. Padovan return 0; 26320a708f8fSGustavo F. Padovan 263348454079SGustavo F. Padovan sk = chan->sk; 263448454079SGustavo F. Padovan 26350a708f8fSGustavo F. Padovan switch (result) { 26360a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 263747d1ec61SGustavo F. Padovan l2cap_conf_rfc_get(chan, rsp->data, len); 26380a708f8fSGustavo F. Padovan break; 26390a708f8fSGustavo F. Padovan 26400a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 264173ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 26420a708f8fSGustavo F. Padovan char req[64]; 26430a708f8fSGustavo F. Padovan 26440a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 2645e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 26460a708f8fSGustavo F. Padovan goto done; 26470a708f8fSGustavo F. Padovan } 26480a708f8fSGustavo F. Padovan 26490a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 26500a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 2651b4450035SGustavo F. Padovan len = l2cap_parse_conf_rsp(chan, rsp->data, len, 2652b4450035SGustavo F. Padovan req, &result); 26530a708f8fSGustavo F. Padovan if (len < 0) { 2654e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 26550a708f8fSGustavo F. Padovan goto done; 26560a708f8fSGustavo F. Padovan } 26570a708f8fSGustavo F. Padovan 26580a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 26590a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 266073ffa904SGustavo F. Padovan chan->num_conf_req++; 26610a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 26620a708f8fSGustavo F. Padovan goto done; 26630a708f8fSGustavo F. Padovan break; 26640a708f8fSGustavo F. Padovan } 26650a708f8fSGustavo F. Padovan 26660a708f8fSGustavo F. Padovan default: 26670a708f8fSGustavo F. Padovan sk->sk_err = ECONNRESET; 2668ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ * 5); 2669e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 26700a708f8fSGustavo F. Padovan goto done; 26710a708f8fSGustavo F. Padovan } 26720a708f8fSGustavo F. Padovan 26730a708f8fSGustavo F. Padovan if (flags & 0x01) 26740a708f8fSGustavo F. Padovan goto done; 26750a708f8fSGustavo F. Padovan 2676b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_INPUT_DONE; 26770a708f8fSGustavo F. Padovan 2678b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_OUTPUT_DONE) { 267947d1ec61SGustavo F. Padovan set_default_fcs(chan); 26800a708f8fSGustavo F. Padovan 268189bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONNECTED); 268242e5c802SGustavo F. Padovan chan->next_tx_seq = 0; 268342e5c802SGustavo F. Padovan chan->expected_tx_seq = 0; 268458d35f87SGustavo F. Padovan skb_queue_head_init(&chan->tx_q); 26850c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) 2686525cd185SGustavo F. Padovan l2cap_ertm_init(chan); 26870a708f8fSGustavo F. Padovan 26880a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 26890a708f8fSGustavo F. Padovan } 26900a708f8fSGustavo F. Padovan 26910a708f8fSGustavo F. Padovan done: 26920a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 26930a708f8fSGustavo F. Padovan return 0; 26940a708f8fSGustavo F. Padovan } 26950a708f8fSGustavo F. Padovan 26960a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 26970a708f8fSGustavo F. Padovan { 26980a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 26990a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 27000a708f8fSGustavo F. Padovan u16 dcid, scid; 270148454079SGustavo F. Padovan struct l2cap_chan *chan; 27020a708f8fSGustavo F. Padovan struct sock *sk; 27030a708f8fSGustavo F. Padovan 27040a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 27050a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 27060a708f8fSGustavo F. Padovan 27070a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 27080a708f8fSGustavo F. Padovan 2709baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 271048454079SGustavo F. Padovan if (!chan) 27110a708f8fSGustavo F. Padovan return 0; 27120a708f8fSGustavo F. Padovan 271348454079SGustavo F. Padovan sk = chan->sk; 271448454079SGustavo F. Padovan 2715fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 2716fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 27170a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 27180a708f8fSGustavo F. Padovan 27190a708f8fSGustavo F. Padovan sk->sk_shutdown = SHUTDOWN_MASK; 27200a708f8fSGustavo F. Padovan 27210a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 27220a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 272389bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_DISCONN); 2724ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 2725ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 5); 27260a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 27270a708f8fSGustavo F. Padovan return 0; 27280a708f8fSGustavo F. Padovan } 27290a708f8fSGustavo F. Padovan 273048454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 27310a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 27320a708f8fSGustavo F. Padovan 2733ba3bd0eeSGustavo F. Padovan chan->ops->close(chan->data); 27340a708f8fSGustavo F. Padovan return 0; 27350a708f8fSGustavo F. Padovan } 27360a708f8fSGustavo F. Padovan 27370a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 27380a708f8fSGustavo F. Padovan { 27390a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 27400a708f8fSGustavo F. Padovan u16 dcid, scid; 274148454079SGustavo F. Padovan struct l2cap_chan *chan; 27420a708f8fSGustavo F. Padovan struct sock *sk; 27430a708f8fSGustavo F. Padovan 27440a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 27450a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 27460a708f8fSGustavo F. Padovan 27470a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 27480a708f8fSGustavo F. Padovan 2749baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 275048454079SGustavo F. Padovan if (!chan) 27510a708f8fSGustavo F. Padovan return 0; 27520a708f8fSGustavo F. Padovan 275348454079SGustavo F. Padovan sk = chan->sk; 275448454079SGustavo F. Padovan 27550a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 27560a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 275789bc500eSGustavo F. Padovan l2cap_state_change(chan,BT_DISCONN); 2758ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 2759ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 5); 27600a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 27610a708f8fSGustavo F. Padovan return 0; 27620a708f8fSGustavo F. Padovan } 27630a708f8fSGustavo F. Padovan 276448454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 27650a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 27660a708f8fSGustavo F. Padovan 2767ba3bd0eeSGustavo F. Padovan chan->ops->close(chan->data); 27680a708f8fSGustavo F. Padovan return 0; 27690a708f8fSGustavo F. Padovan } 27700a708f8fSGustavo F. Padovan 27710a708f8fSGustavo F. Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 27720a708f8fSGustavo F. Padovan { 27730a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 27740a708f8fSGustavo F. Padovan u16 type; 27750a708f8fSGustavo F. Padovan 27760a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 27770a708f8fSGustavo F. Padovan 27780a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 27790a708f8fSGustavo F. Padovan 27800a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 27810a708f8fSGustavo F. Padovan u8 buf[8]; 27820a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 27830a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 27840a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 27850a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 27860a708f8fSGustavo F. Padovan if (!disable_ertm) 27870a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 27880a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 27890a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 27900a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 27910a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 27920a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 27930a708f8fSGustavo F. Padovan u8 buf[12]; 27940a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 27950a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 27960a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 27970a708f8fSGustavo F. Padovan memcpy(buf + 4, l2cap_fixed_chan, 8); 27980a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 27990a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 28000a708f8fSGustavo F. Padovan } else { 28010a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 28020a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 28030a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); 28040a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 28050a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(rsp), &rsp); 28060a708f8fSGustavo F. Padovan } 28070a708f8fSGustavo F. Padovan 28080a708f8fSGustavo F. Padovan return 0; 28090a708f8fSGustavo F. Padovan } 28100a708f8fSGustavo F. Padovan 28110a708f8fSGustavo F. Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 28120a708f8fSGustavo F. Padovan { 28130a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 28140a708f8fSGustavo F. Padovan u16 type, result; 28150a708f8fSGustavo F. Padovan 28160a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 28170a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 28180a708f8fSGustavo F. Padovan 28190a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 28200a708f8fSGustavo F. Padovan 2821e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 2822e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 2823e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 2824e90165beSAndrei Emeltchenko return 0; 2825e90165beSAndrei Emeltchenko 28260a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 28270a708f8fSGustavo F. Padovan 28280a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 28290a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 28300a708f8fSGustavo F. Padovan conn->info_ident = 0; 28310a708f8fSGustavo F. Padovan 28320a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 28330a708f8fSGustavo F. Padovan 28340a708f8fSGustavo F. Padovan return 0; 28350a708f8fSGustavo F. Padovan } 28360a708f8fSGustavo F. Padovan 28370a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 28380a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 28390a708f8fSGustavo F. Padovan 28400a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 28410a708f8fSGustavo F. Padovan struct l2cap_info_req req; 28420a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 28430a708f8fSGustavo F. Padovan 28440a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 28450a708f8fSGustavo F. Padovan 28460a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 28470a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 28480a708f8fSGustavo F. Padovan } else { 28490a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 28500a708f8fSGustavo F. Padovan conn->info_ident = 0; 28510a708f8fSGustavo F. Padovan 28520a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 28530a708f8fSGustavo F. Padovan } 28540a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 28550a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 28560a708f8fSGustavo F. Padovan conn->info_ident = 0; 28570a708f8fSGustavo F. Padovan 28580a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 28590a708f8fSGustavo F. Padovan } 28600a708f8fSGustavo F. Padovan 28610a708f8fSGustavo F. Padovan return 0; 28620a708f8fSGustavo F. Padovan } 28630a708f8fSGustavo F. Padovan 2864e2174ca4SGustavo F. Padovan static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, 2865de73115aSClaudio Takahasi u16 to_multiplier) 2866de73115aSClaudio Takahasi { 2867de73115aSClaudio Takahasi u16 max_latency; 2868de73115aSClaudio Takahasi 2869de73115aSClaudio Takahasi if (min > max || min < 6 || max > 3200) 2870de73115aSClaudio Takahasi return -EINVAL; 2871de73115aSClaudio Takahasi 2872de73115aSClaudio Takahasi if (to_multiplier < 10 || to_multiplier > 3200) 2873de73115aSClaudio Takahasi return -EINVAL; 2874de73115aSClaudio Takahasi 2875de73115aSClaudio Takahasi if (max >= to_multiplier * 8) 2876de73115aSClaudio Takahasi return -EINVAL; 2877de73115aSClaudio Takahasi 2878de73115aSClaudio Takahasi max_latency = (to_multiplier * 8 / max) - 1; 2879de73115aSClaudio Takahasi if (latency > 499 || latency > max_latency) 2880de73115aSClaudio Takahasi return -EINVAL; 2881de73115aSClaudio Takahasi 2882de73115aSClaudio Takahasi return 0; 2883de73115aSClaudio Takahasi } 2884de73115aSClaudio Takahasi 2885de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 2886de73115aSClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 2887de73115aSClaudio Takahasi { 2888de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 2889de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 2890de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 2891de73115aSClaudio Takahasi u16 min, max, latency, to_multiplier, cmd_len; 28922ce603ebSClaudio Takahasi int err; 2893de73115aSClaudio Takahasi 2894de73115aSClaudio Takahasi if (!(hcon->link_mode & HCI_LM_MASTER)) 2895de73115aSClaudio Takahasi return -EINVAL; 2896de73115aSClaudio Takahasi 2897de73115aSClaudio Takahasi cmd_len = __le16_to_cpu(cmd->len); 2898de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 2899de73115aSClaudio Takahasi return -EPROTO; 2900de73115aSClaudio Takahasi 2901de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 2902de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 2903de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 2904de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 2905de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 2906de73115aSClaudio Takahasi 2907de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 2908de73115aSClaudio Takahasi min, max, latency, to_multiplier); 2909de73115aSClaudio Takahasi 2910de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 29112ce603ebSClaudio Takahasi 29122ce603ebSClaudio Takahasi err = l2cap_check_conn_param(min, max, latency, to_multiplier); 29132ce603ebSClaudio Takahasi if (err) 2914de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 2915de73115aSClaudio Takahasi else 2916de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 2917de73115aSClaudio Takahasi 2918de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 2919de73115aSClaudio Takahasi sizeof(rsp), &rsp); 2920de73115aSClaudio Takahasi 29212ce603ebSClaudio Takahasi if (!err) 29222ce603ebSClaudio Takahasi hci_le_conn_update(hcon, min, max, latency, to_multiplier); 29232ce603ebSClaudio Takahasi 2924de73115aSClaudio Takahasi return 0; 2925de73115aSClaudio Takahasi } 2926de73115aSClaudio Takahasi 29273300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 29283300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 29293300d9a9SClaudio Takahasi { 29303300d9a9SClaudio Takahasi int err = 0; 29313300d9a9SClaudio Takahasi 29323300d9a9SClaudio Takahasi switch (cmd->code) { 29333300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 29343300d9a9SClaudio Takahasi l2cap_command_rej(conn, cmd, data); 29353300d9a9SClaudio Takahasi break; 29363300d9a9SClaudio Takahasi 29373300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 29383300d9a9SClaudio Takahasi err = l2cap_connect_req(conn, cmd, data); 29393300d9a9SClaudio Takahasi break; 29403300d9a9SClaudio Takahasi 29413300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 29423300d9a9SClaudio Takahasi err = l2cap_connect_rsp(conn, cmd, data); 29433300d9a9SClaudio Takahasi break; 29443300d9a9SClaudio Takahasi 29453300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 29463300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 29473300d9a9SClaudio Takahasi break; 29483300d9a9SClaudio Takahasi 29493300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 29503300d9a9SClaudio Takahasi err = l2cap_config_rsp(conn, cmd, data); 29513300d9a9SClaudio Takahasi break; 29523300d9a9SClaudio Takahasi 29533300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 29543300d9a9SClaudio Takahasi err = l2cap_disconnect_req(conn, cmd, data); 29553300d9a9SClaudio Takahasi break; 29563300d9a9SClaudio Takahasi 29573300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 29583300d9a9SClaudio Takahasi err = l2cap_disconnect_rsp(conn, cmd, data); 29593300d9a9SClaudio Takahasi break; 29603300d9a9SClaudio Takahasi 29613300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 29623300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 29633300d9a9SClaudio Takahasi break; 29643300d9a9SClaudio Takahasi 29653300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 29663300d9a9SClaudio Takahasi break; 29673300d9a9SClaudio Takahasi 29683300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 29693300d9a9SClaudio Takahasi err = l2cap_information_req(conn, cmd, data); 29703300d9a9SClaudio Takahasi break; 29713300d9a9SClaudio Takahasi 29723300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 29733300d9a9SClaudio Takahasi err = l2cap_information_rsp(conn, cmd, data); 29743300d9a9SClaudio Takahasi break; 29753300d9a9SClaudio Takahasi 29763300d9a9SClaudio Takahasi default: 29773300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 29783300d9a9SClaudio Takahasi err = -EINVAL; 29793300d9a9SClaudio Takahasi break; 29803300d9a9SClaudio Takahasi } 29813300d9a9SClaudio Takahasi 29823300d9a9SClaudio Takahasi return err; 29833300d9a9SClaudio Takahasi } 29843300d9a9SClaudio Takahasi 29853300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 29863300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 29873300d9a9SClaudio Takahasi { 29883300d9a9SClaudio Takahasi switch (cmd->code) { 29893300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 29903300d9a9SClaudio Takahasi return 0; 29913300d9a9SClaudio Takahasi 29923300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 2993de73115aSClaudio Takahasi return l2cap_conn_param_update_req(conn, cmd, data); 29943300d9a9SClaudio Takahasi 29953300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 29963300d9a9SClaudio Takahasi return 0; 29973300d9a9SClaudio Takahasi 29983300d9a9SClaudio Takahasi default: 29993300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 30003300d9a9SClaudio Takahasi return -EINVAL; 30013300d9a9SClaudio Takahasi } 30023300d9a9SClaudio Takahasi } 30033300d9a9SClaudio Takahasi 30043300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 30053300d9a9SClaudio Takahasi struct sk_buff *skb) 30060a708f8fSGustavo F. Padovan { 30070a708f8fSGustavo F. Padovan u8 *data = skb->data; 30080a708f8fSGustavo F. Padovan int len = skb->len; 30090a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 30103300d9a9SClaudio Takahasi int err; 30110a708f8fSGustavo F. Padovan 30120a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 30130a708f8fSGustavo F. Padovan 30140a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 30150a708f8fSGustavo F. Padovan u16 cmd_len; 30160a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 30170a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 30180a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 30190a708f8fSGustavo F. Padovan 30200a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 30210a708f8fSGustavo F. Padovan 30220a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); 30230a708f8fSGustavo F. Padovan 30240a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 30250a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 30260a708f8fSGustavo F. Padovan break; 30270a708f8fSGustavo F. Padovan } 30280a708f8fSGustavo F. Padovan 30293300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 30303300d9a9SClaudio Takahasi err = l2cap_le_sig_cmd(conn, &cmd, data); 30313300d9a9SClaudio Takahasi else 30323300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 30330a708f8fSGustavo F. Padovan 30340a708f8fSGustavo F. Padovan if (err) { 30350a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 30362c6d1a2eSGustavo F. Padovan 30372c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 30380a708f8fSGustavo F. Padovan 30390a708f8fSGustavo F. Padovan /* FIXME: Map err to a valid reason */ 30400a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0); 30410a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); 30420a708f8fSGustavo F. Padovan } 30430a708f8fSGustavo F. Padovan 30440a708f8fSGustavo F. Padovan data += cmd_len; 30450a708f8fSGustavo F. Padovan len -= cmd_len; 30460a708f8fSGustavo F. Padovan } 30470a708f8fSGustavo F. Padovan 30480a708f8fSGustavo F. Padovan kfree_skb(skb); 30490a708f8fSGustavo F. Padovan } 30500a708f8fSGustavo F. Padovan 305147d1ec61SGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) 30520a708f8fSGustavo F. Padovan { 30530a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 30540a708f8fSGustavo F. Padovan int hdr_size = L2CAP_HDR_SIZE + 2; 30550a708f8fSGustavo F. Padovan 305647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 30570a708f8fSGustavo F. Padovan skb_trim(skb, skb->len - 2); 30580a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 30590a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 30600a708f8fSGustavo F. Padovan 30610a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 30620a708f8fSGustavo F. Padovan return -EBADMSG; 30630a708f8fSGustavo F. Padovan } 30640a708f8fSGustavo F. Padovan return 0; 30650a708f8fSGustavo F. Padovan } 30660a708f8fSGustavo F. Padovan 3067525cd185SGustavo F. Padovan static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) 30680a708f8fSGustavo F. Padovan { 30690a708f8fSGustavo F. Padovan u16 control = 0; 30700a708f8fSGustavo F. Padovan 30716a026610SGustavo F. Padovan chan->frames_sent = 0; 30720a708f8fSGustavo F. Padovan 307342e5c802SGustavo F. Padovan control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 30740a708f8fSGustavo F. Padovan 3075525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 30760a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 3077525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 3078525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 30790a708f8fSGustavo F. Padovan } 30800a708f8fSGustavo F. Padovan 3081525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY) 3082525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 30830a708f8fSGustavo F. Padovan 3084525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 30850a708f8fSGustavo F. Padovan 3086525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) && 30876a026610SGustavo F. Padovan chan->frames_sent == 0) { 30880a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 3089525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 30900a708f8fSGustavo F. Padovan } 30910a708f8fSGustavo F. Padovan } 30920a708f8fSGustavo F. Padovan 309342e5c802SGustavo F. Padovan static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) 30940a708f8fSGustavo F. Padovan { 30950a708f8fSGustavo F. Padovan struct sk_buff *next_skb; 30960a708f8fSGustavo F. Padovan int tx_seq_offset, next_tx_seq_offset; 30970a708f8fSGustavo F. Padovan 30980a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 30990a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 31000a708f8fSGustavo F. Padovan 3101f1c6775bSGustavo F. Padovan next_skb = skb_peek(&chan->srej_q); 31020a708f8fSGustavo F. Padovan if (!next_skb) { 3103f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->srej_q, skb); 31040a708f8fSGustavo F. Padovan return 0; 31050a708f8fSGustavo F. Padovan } 31060a708f8fSGustavo F. Padovan 310742e5c802SGustavo F. Padovan tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; 31080a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 31090a708f8fSGustavo F. Padovan tx_seq_offset += 64; 31100a708f8fSGustavo F. Padovan 31110a708f8fSGustavo F. Padovan do { 31120a708f8fSGustavo F. Padovan if (bt_cb(next_skb)->tx_seq == tx_seq) 31130a708f8fSGustavo F. Padovan return -EINVAL; 31140a708f8fSGustavo F. Padovan 31150a708f8fSGustavo F. Padovan next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - 311642e5c802SGustavo F. Padovan chan->buffer_seq) % 64; 31170a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 31180a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 31190a708f8fSGustavo F. Padovan 31200a708f8fSGustavo F. Padovan if (next_tx_seq_offset > tx_seq_offset) { 3121f1c6775bSGustavo F. Padovan __skb_queue_before(&chan->srej_q, next_skb, skb); 31220a708f8fSGustavo F. Padovan return 0; 31230a708f8fSGustavo F. Padovan } 31240a708f8fSGustavo F. Padovan 3125f1c6775bSGustavo F. Padovan if (skb_queue_is_last(&chan->srej_q, next_skb)) 31260a708f8fSGustavo F. Padovan break; 31270a708f8fSGustavo F. Padovan 3128f1c6775bSGustavo F. Padovan } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); 31290a708f8fSGustavo F. Padovan 3130f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->srej_q, skb); 31310a708f8fSGustavo F. Padovan 31320a708f8fSGustavo F. Padovan return 0; 31330a708f8fSGustavo F. Padovan } 31340a708f8fSGustavo F. Padovan 3135525cd185SGustavo F. Padovan static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) 31360a708f8fSGustavo F. Padovan { 31370a708f8fSGustavo F. Padovan struct sk_buff *_skb; 31380a708f8fSGustavo F. Padovan int err; 31390a708f8fSGustavo F. Padovan 31400a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 31410a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 3142525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) 31430a708f8fSGustavo F. Padovan goto drop; 31440a708f8fSGustavo F. Padovan 314523070494SGustavo F. Padovan return chan->ops->recv(chan->data, skb); 31460a708f8fSGustavo F. Padovan 31470a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 3148525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) 31490a708f8fSGustavo F. Padovan goto drop; 31500a708f8fSGustavo F. Padovan 31516f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 31520a708f8fSGustavo F. Padovan 31530c1bc5c6SGustavo F. Padovan if (chan->sdu_len > chan->imtu) 31540a708f8fSGustavo F. Padovan goto disconnect; 31550a708f8fSGustavo F. Padovan 31566f61fd47SGustavo F. Padovan chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); 31576f61fd47SGustavo F. Padovan if (!chan->sdu) 31580a708f8fSGustavo F. Padovan return -ENOMEM; 31590a708f8fSGustavo F. Padovan 31600a708f8fSGustavo F. Padovan /* pull sdu_len bytes only after alloc, because of Local Busy 31610a708f8fSGustavo F. Padovan * condition we have to be sure that this will be executed 31620a708f8fSGustavo F. Padovan * only once, i.e., when alloc does not fail */ 31630a708f8fSGustavo F. Padovan skb_pull(skb, 2); 31640a708f8fSGustavo F. Padovan 31656f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 31660a708f8fSGustavo F. Padovan 3167525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_SDU; 31686f61fd47SGustavo F. Padovan chan->partial_sdu_len = skb->len; 31690a708f8fSGustavo F. Padovan break; 31700a708f8fSGustavo F. Padovan 31710a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 3172525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 31730a708f8fSGustavo F. Padovan goto disconnect; 31740a708f8fSGustavo F. Padovan 31756f61fd47SGustavo F. Padovan if (!chan->sdu) 31760a708f8fSGustavo F. Padovan goto disconnect; 31770a708f8fSGustavo F. Padovan 31786f61fd47SGustavo F. Padovan chan->partial_sdu_len += skb->len; 31796f61fd47SGustavo F. Padovan if (chan->partial_sdu_len > chan->sdu_len) 31800a708f8fSGustavo F. Padovan goto drop; 31810a708f8fSGustavo F. Padovan 31826f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 31830a708f8fSGustavo F. Padovan 31840a708f8fSGustavo F. Padovan break; 31850a708f8fSGustavo F. Padovan 31860a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 3187525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 31880a708f8fSGustavo F. Padovan goto disconnect; 31890a708f8fSGustavo F. Padovan 31906f61fd47SGustavo F. Padovan if (!chan->sdu) 31910a708f8fSGustavo F. Padovan goto disconnect; 31920a708f8fSGustavo F. Padovan 3193525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) { 31946f61fd47SGustavo F. Padovan chan->partial_sdu_len += skb->len; 31950a708f8fSGustavo F. Padovan 31960c1bc5c6SGustavo F. Padovan if (chan->partial_sdu_len > chan->imtu) 31970a708f8fSGustavo F. Padovan goto drop; 31980a708f8fSGustavo F. Padovan 31996f61fd47SGustavo F. Padovan if (chan->partial_sdu_len != chan->sdu_len) 32000a708f8fSGustavo F. Padovan goto drop; 32010a708f8fSGustavo F. Padovan 32026f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 32030a708f8fSGustavo F. Padovan } 32040a708f8fSGustavo F. Padovan 32056f61fd47SGustavo F. Padovan _skb = skb_clone(chan->sdu, GFP_ATOMIC); 32060a708f8fSGustavo F. Padovan if (!_skb) { 3207525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_RETRY; 32080a708f8fSGustavo F. Padovan return -ENOMEM; 32090a708f8fSGustavo F. Padovan } 32100a708f8fSGustavo F. Padovan 321123070494SGustavo F. Padovan err = chan->ops->recv(chan->data, _skb); 32120a708f8fSGustavo F. Padovan if (err < 0) { 32130a708f8fSGustavo F. Padovan kfree_skb(_skb); 3214525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_RETRY; 32150a708f8fSGustavo F. Padovan return err; 32160a708f8fSGustavo F. Padovan } 32170a708f8fSGustavo F. Padovan 3218525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SAR_RETRY; 3219525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SAR_SDU; 32200a708f8fSGustavo F. Padovan 32216f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 32220a708f8fSGustavo F. Padovan break; 32230a708f8fSGustavo F. Padovan } 32240a708f8fSGustavo F. Padovan 32250a708f8fSGustavo F. Padovan kfree_skb(skb); 32260a708f8fSGustavo F. Padovan return 0; 32270a708f8fSGustavo F. Padovan 32280a708f8fSGustavo F. Padovan drop: 32296f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 32306f61fd47SGustavo F. Padovan chan->sdu = NULL; 32310a708f8fSGustavo F. Padovan 32320a708f8fSGustavo F. Padovan disconnect: 32338c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 32340a708f8fSGustavo F. Padovan kfree_skb(skb); 32350a708f8fSGustavo F. Padovan return 0; 32360a708f8fSGustavo F. Padovan } 32370a708f8fSGustavo F. Padovan 3238525cd185SGustavo F. Padovan static int l2cap_try_push_rx_skb(struct l2cap_chan *chan) 32390a708f8fSGustavo F. Padovan { 32400a708f8fSGustavo F. Padovan struct sk_buff *skb; 32410a708f8fSGustavo F. Padovan u16 control; 32420a708f8fSGustavo F. Padovan int err; 32430a708f8fSGustavo F. Padovan 3244f1c6775bSGustavo F. Padovan while ((skb = skb_dequeue(&chan->busy_q))) { 32450a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 3246525cd185SGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(chan, skb, control); 32470a708f8fSGustavo F. Padovan if (err < 0) { 3248f1c6775bSGustavo F. Padovan skb_queue_head(&chan->busy_q, skb); 32490a708f8fSGustavo F. Padovan return -EBUSY; 32500a708f8fSGustavo F. Padovan } 32510a708f8fSGustavo F. Padovan 325242e5c802SGustavo F. Padovan chan->buffer_seq = (chan->buffer_seq + 1) % 64; 32530a708f8fSGustavo F. Padovan } 32540a708f8fSGustavo F. Padovan 3255525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_RNR_SENT)) 32560a708f8fSGustavo F. Padovan goto done; 32570a708f8fSGustavo F. Padovan 325842e5c802SGustavo F. Padovan control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 32590a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; 3260525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 32616a026610SGustavo F. Padovan chan->retry_count = 1; 32620a708f8fSGustavo F. Padovan 3263e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 32640a708f8fSGustavo F. Padovan __mod_monitor_timer(); 32650a708f8fSGustavo F. Padovan 3266525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_WAIT_F; 32670a708f8fSGustavo F. Padovan 32680a708f8fSGustavo F. Padovan done: 3269525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; 3270525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_RNR_SENT; 32710a708f8fSGustavo F. Padovan 327249208c9cSGustavo F. Padovan BT_DBG("chan %p, Exit local busy", chan); 32730a708f8fSGustavo F. Padovan 32740a708f8fSGustavo F. Padovan return 0; 32750a708f8fSGustavo F. Padovan } 32760a708f8fSGustavo F. Padovan 32770a708f8fSGustavo F. Padovan static void l2cap_busy_work(struct work_struct *work) 32780a708f8fSGustavo F. Padovan { 32790a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 3280311bb895SGustavo F. Padovan struct l2cap_chan *chan = 3281311bb895SGustavo F. Padovan container_of(work, struct l2cap_chan, busy_work); 3282311bb895SGustavo F. Padovan struct sock *sk = chan->sk; 32830a708f8fSGustavo F. Padovan int n_tries = 0, timeo = HZ/5, err; 32840a708f8fSGustavo F. Padovan struct sk_buff *skb; 32850a708f8fSGustavo F. Padovan 32860a708f8fSGustavo F. Padovan lock_sock(sk); 32870a708f8fSGustavo F. Padovan 32880a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 3289311bb895SGustavo F. Padovan while ((skb = skb_peek(&chan->busy_q))) { 32900a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 32910a708f8fSGustavo F. Padovan 32920a708f8fSGustavo F. Padovan if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { 32930a708f8fSGustavo F. Padovan err = -EBUSY; 32948c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, EBUSY); 32950a708f8fSGustavo F. Padovan break; 32960a708f8fSGustavo F. Padovan } 32970a708f8fSGustavo F. Padovan 32980a708f8fSGustavo F. Padovan if (!timeo) 32990a708f8fSGustavo F. Padovan timeo = HZ/5; 33000a708f8fSGustavo F. Padovan 33010a708f8fSGustavo F. Padovan if (signal_pending(current)) { 33020a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 33030a708f8fSGustavo F. Padovan break; 33040a708f8fSGustavo F. Padovan } 33050a708f8fSGustavo F. Padovan 33060a708f8fSGustavo F. Padovan release_sock(sk); 33070a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 33080a708f8fSGustavo F. Padovan lock_sock(sk); 33090a708f8fSGustavo F. Padovan 33100a708f8fSGustavo F. Padovan err = sock_error(sk); 33110a708f8fSGustavo F. Padovan if (err) 33120a708f8fSGustavo F. Padovan break; 33130a708f8fSGustavo F. Padovan 3314311bb895SGustavo F. Padovan if (l2cap_try_push_rx_skb(chan) == 0) 33150a708f8fSGustavo F. Padovan break; 33160a708f8fSGustavo F. Padovan } 33170a708f8fSGustavo F. Padovan 33180a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 33190a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 33200a708f8fSGustavo F. Padovan 33210a708f8fSGustavo F. Padovan release_sock(sk); 33220a708f8fSGustavo F. Padovan } 33230a708f8fSGustavo F. Padovan 3324525cd185SGustavo F. Padovan static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) 33250a708f8fSGustavo F. Padovan { 33260a708f8fSGustavo F. Padovan int sctrl, err; 33270a708f8fSGustavo F. Padovan 3328525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 33290a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 3330f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->busy_q, skb); 3331525cd185SGustavo F. Padovan return l2cap_try_push_rx_skb(chan); 33320a708f8fSGustavo F. Padovan 33330a708f8fSGustavo F. Padovan 33340a708f8fSGustavo F. Padovan } 33350a708f8fSGustavo F. Padovan 3336525cd185SGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(chan, skb, control); 33370a708f8fSGustavo F. Padovan if (err >= 0) { 333842e5c802SGustavo F. Padovan chan->buffer_seq = (chan->buffer_seq + 1) % 64; 33390a708f8fSGustavo F. Padovan return err; 33400a708f8fSGustavo F. Padovan } 33410a708f8fSGustavo F. Padovan 33420a708f8fSGustavo F. Padovan /* Busy Condition */ 3343311bb895SGustavo F. Padovan BT_DBG("chan %p, Enter local busy", chan); 33440a708f8fSGustavo F. Padovan 3345525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_LOCAL_BUSY; 33460a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 3347f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->busy_q, skb); 33480a708f8fSGustavo F. Padovan 334942e5c802SGustavo F. Padovan sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 33500a708f8fSGustavo F. Padovan sctrl |= L2CAP_SUPER_RCV_NOT_READY; 3351525cd185SGustavo F. Padovan l2cap_send_sframe(chan, sctrl); 33520a708f8fSGustavo F. Padovan 3353525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 33540a708f8fSGustavo F. Padovan 3355e92c8e70SGustavo F. Padovan del_timer(&chan->ack_timer); 33560a708f8fSGustavo F. Padovan 3357311bb895SGustavo F. Padovan queue_work(_busy_wq, &chan->busy_work); 33580a708f8fSGustavo F. Padovan 33590a708f8fSGustavo F. Padovan return err; 33600a708f8fSGustavo F. Padovan } 33610a708f8fSGustavo F. Padovan 3362525cd185SGustavo F. Padovan static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) 33630a708f8fSGustavo F. Padovan { 33640a708f8fSGustavo F. Padovan struct sk_buff *_skb; 33650a708f8fSGustavo F. Padovan int err = -EINVAL; 33660a708f8fSGustavo F. Padovan 33670a708f8fSGustavo F. Padovan /* 33680a708f8fSGustavo F. Padovan * TODO: We have to notify the userland if some data is lost with the 33690a708f8fSGustavo F. Padovan * Streaming Mode. 33700a708f8fSGustavo F. Padovan */ 33710a708f8fSGustavo F. Padovan 33720a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 33730a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 3374525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) { 33756f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 33760a708f8fSGustavo F. Padovan break; 33770a708f8fSGustavo F. Padovan } 33780a708f8fSGustavo F. Padovan 337923070494SGustavo F. Padovan err = chan->ops->recv(chan->data, skb); 33800a708f8fSGustavo F. Padovan if (!err) 33810a708f8fSGustavo F. Padovan return 0; 33820a708f8fSGustavo F. Padovan 33830a708f8fSGustavo F. Padovan break; 33840a708f8fSGustavo F. Padovan 33850a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 3386525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) { 33876f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 33880a708f8fSGustavo F. Padovan break; 33890a708f8fSGustavo F. Padovan } 33900a708f8fSGustavo F. Padovan 33916f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 33920a708f8fSGustavo F. Padovan skb_pull(skb, 2); 33930a708f8fSGustavo F. Padovan 33940c1bc5c6SGustavo F. Padovan if (chan->sdu_len > chan->imtu) { 33950a708f8fSGustavo F. Padovan err = -EMSGSIZE; 33960a708f8fSGustavo F. Padovan break; 33970a708f8fSGustavo F. Padovan } 33980a708f8fSGustavo F. Padovan 33996f61fd47SGustavo F. Padovan chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); 34006f61fd47SGustavo F. Padovan if (!chan->sdu) { 34010a708f8fSGustavo F. Padovan err = -ENOMEM; 34020a708f8fSGustavo F. Padovan break; 34030a708f8fSGustavo F. Padovan } 34040a708f8fSGustavo F. Padovan 34056f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 34060a708f8fSGustavo F. Padovan 3407525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_SDU; 34086f61fd47SGustavo F. Padovan chan->partial_sdu_len = skb->len; 34090a708f8fSGustavo F. Padovan err = 0; 34100a708f8fSGustavo F. Padovan break; 34110a708f8fSGustavo F. Padovan 34120a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 3413525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 34140a708f8fSGustavo F. Padovan break; 34150a708f8fSGustavo F. Padovan 34166f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 34170a708f8fSGustavo F. Padovan 34186f61fd47SGustavo F. Padovan chan->partial_sdu_len += skb->len; 34196f61fd47SGustavo F. Padovan if (chan->partial_sdu_len > chan->sdu_len) 34206f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 34210a708f8fSGustavo F. Padovan else 34220a708f8fSGustavo F. Padovan err = 0; 34230a708f8fSGustavo F. Padovan 34240a708f8fSGustavo F. Padovan break; 34250a708f8fSGustavo F. Padovan 34260a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 3427525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 34280a708f8fSGustavo F. Padovan break; 34290a708f8fSGustavo F. Padovan 34306f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 34310a708f8fSGustavo F. Padovan 3432525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SAR_SDU; 34336f61fd47SGustavo F. Padovan chan->partial_sdu_len += skb->len; 34340a708f8fSGustavo F. Padovan 34350c1bc5c6SGustavo F. Padovan if (chan->partial_sdu_len > chan->imtu) 34360a708f8fSGustavo F. Padovan goto drop; 34370a708f8fSGustavo F. Padovan 34386f61fd47SGustavo F. Padovan if (chan->partial_sdu_len == chan->sdu_len) { 34396f61fd47SGustavo F. Padovan _skb = skb_clone(chan->sdu, GFP_ATOMIC); 344023070494SGustavo F. Padovan err = chan->ops->recv(chan->data, _skb); 34410a708f8fSGustavo F. Padovan if (err < 0) 34420a708f8fSGustavo F. Padovan kfree_skb(_skb); 34430a708f8fSGustavo F. Padovan } 34440a708f8fSGustavo F. Padovan err = 0; 34450a708f8fSGustavo F. Padovan 34460a708f8fSGustavo F. Padovan drop: 34476f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 34480a708f8fSGustavo F. Padovan break; 34490a708f8fSGustavo F. Padovan } 34500a708f8fSGustavo F. Padovan 34510a708f8fSGustavo F. Padovan kfree_skb(skb); 34520a708f8fSGustavo F. Padovan return err; 34530a708f8fSGustavo F. Padovan } 34540a708f8fSGustavo F. Padovan 3455525cd185SGustavo F. Padovan static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) 34560a708f8fSGustavo F. Padovan { 34570a708f8fSGustavo F. Padovan struct sk_buff *skb; 34580a708f8fSGustavo F. Padovan u16 control; 34590a708f8fSGustavo F. Padovan 3460f1c6775bSGustavo F. Padovan while ((skb = skb_peek(&chan->srej_q))) { 34610a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq != tx_seq) 34620a708f8fSGustavo F. Padovan break; 34630a708f8fSGustavo F. Padovan 3464f1c6775bSGustavo F. Padovan skb = skb_dequeue(&chan->srej_q); 34650a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 3466525cd185SGustavo F. Padovan l2cap_ertm_reassembly_sdu(chan, skb, control); 346742e5c802SGustavo F. Padovan chan->buffer_seq_srej = 346842e5c802SGustavo F. Padovan (chan->buffer_seq_srej + 1) % 64; 34690a708f8fSGustavo F. Padovan tx_seq = (tx_seq + 1) % 64; 34700a708f8fSGustavo F. Padovan } 34710a708f8fSGustavo F. Padovan } 34720a708f8fSGustavo F. Padovan 3473525cd185SGustavo F. Padovan static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) 34740a708f8fSGustavo F. Padovan { 34750a708f8fSGustavo F. Padovan struct srej_list *l, *tmp; 34760a708f8fSGustavo F. Padovan u16 control; 34770a708f8fSGustavo F. Padovan 347839d5a3eeSGustavo F. Padovan list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { 34790a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 34800a708f8fSGustavo F. Padovan list_del(&l->list); 34810a708f8fSGustavo F. Padovan kfree(l); 34820a708f8fSGustavo F. Padovan return; 34830a708f8fSGustavo F. Padovan } 34840a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 34850a708f8fSGustavo F. Padovan control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 3486525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 34870a708f8fSGustavo F. Padovan list_del(&l->list); 348839d5a3eeSGustavo F. Padovan list_add_tail(&l->list, &chan->srej_l); 34890a708f8fSGustavo F. Padovan } 34900a708f8fSGustavo F. Padovan } 34910a708f8fSGustavo F. Padovan 3492525cd185SGustavo F. Padovan static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) 34930a708f8fSGustavo F. Padovan { 34940a708f8fSGustavo F. Padovan struct srej_list *new; 34950a708f8fSGustavo F. Padovan u16 control; 34960a708f8fSGustavo F. Padovan 349742e5c802SGustavo F. Padovan while (tx_seq != chan->expected_tx_seq) { 34980a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 349942e5c802SGustavo F. Padovan control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 3500525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 35010a708f8fSGustavo F. Padovan 35020a708f8fSGustavo F. Padovan new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); 350342e5c802SGustavo F. Padovan new->tx_seq = chan->expected_tx_seq; 350442e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 350539d5a3eeSGustavo F. Padovan list_add_tail(&new->list, &chan->srej_l); 35060a708f8fSGustavo F. Padovan } 350742e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 35080a708f8fSGustavo F. Padovan } 35090a708f8fSGustavo F. Padovan 3510525cd185SGustavo F. Padovan static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) 35110a708f8fSGustavo F. Padovan { 35120a708f8fSGustavo F. Padovan u8 tx_seq = __get_txseq(rx_control); 35130a708f8fSGustavo F. Padovan u8 req_seq = __get_reqseq(rx_control); 35140a708f8fSGustavo F. Padovan u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; 35150a708f8fSGustavo F. Padovan int tx_seq_offset, expected_tx_seq_offset; 351647d1ec61SGustavo F. Padovan int num_to_ack = (chan->tx_win/6) + 1; 35170a708f8fSGustavo F. Padovan int err = 0; 35180a708f8fSGustavo F. Padovan 3519525cd185SGustavo F. Padovan BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, 3520525cd185SGustavo F. Padovan tx_seq, rx_control); 35210a708f8fSGustavo F. Padovan 35220a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 3523525cd185SGustavo F. Padovan chan->conn_state & L2CAP_CONN_WAIT_F) { 3524e92c8e70SGustavo F. Padovan del_timer(&chan->monitor_timer); 35256a026610SGustavo F. Padovan if (chan->unacked_frames > 0) 35260a708f8fSGustavo F. Padovan __mod_retrans_timer(); 3527525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_WAIT_F; 35280a708f8fSGustavo F. Padovan } 35290a708f8fSGustavo F. Padovan 353042e5c802SGustavo F. Padovan chan->expected_ack_seq = req_seq; 353142e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 35320a708f8fSGustavo F. Padovan 353342e5c802SGustavo F. Padovan if (tx_seq == chan->expected_tx_seq) 35340a708f8fSGustavo F. Padovan goto expected; 35350a708f8fSGustavo F. Padovan 353642e5c802SGustavo F. Padovan tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; 35370a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 35380a708f8fSGustavo F. Padovan tx_seq_offset += 64; 35390a708f8fSGustavo F. Padovan 35400a708f8fSGustavo F. Padovan /* invalid tx_seq */ 354147d1ec61SGustavo F. Padovan if (tx_seq_offset >= chan->tx_win) { 35428c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 35430a708f8fSGustavo F. Padovan goto drop; 35440a708f8fSGustavo F. Padovan } 35450a708f8fSGustavo F. Padovan 3546e6949280SMat Martineau if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) 35470a708f8fSGustavo F. Padovan goto drop; 35480a708f8fSGustavo F. Padovan 3549525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { 35500a708f8fSGustavo F. Padovan struct srej_list *first; 35510a708f8fSGustavo F. Padovan 355239d5a3eeSGustavo F. Padovan first = list_first_entry(&chan->srej_l, 35530a708f8fSGustavo F. Padovan struct srej_list, list); 35540a708f8fSGustavo F. Padovan if (tx_seq == first->tx_seq) { 355542e5c802SGustavo F. Padovan l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); 3556525cd185SGustavo F. Padovan l2cap_check_srej_gap(chan, tx_seq); 35570a708f8fSGustavo F. Padovan 35580a708f8fSGustavo F. Padovan list_del(&first->list); 35590a708f8fSGustavo F. Padovan kfree(first); 35600a708f8fSGustavo F. Padovan 356139d5a3eeSGustavo F. Padovan if (list_empty(&chan->srej_l)) { 356242e5c802SGustavo F. Padovan chan->buffer_seq = chan->buffer_seq_srej; 3563525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SREJ_SENT; 3564525cd185SGustavo F. Padovan l2cap_send_ack(chan); 356549208c9cSGustavo F. Padovan BT_DBG("chan %p, Exit SREJ_SENT", chan); 35660a708f8fSGustavo F. Padovan } 35670a708f8fSGustavo F. Padovan } else { 35680a708f8fSGustavo F. Padovan struct srej_list *l; 35690a708f8fSGustavo F. Padovan 35700a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 357142e5c802SGustavo F. Padovan if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) 35720a708f8fSGustavo F. Padovan goto drop; 35730a708f8fSGustavo F. Padovan 357439d5a3eeSGustavo F. Padovan list_for_each_entry(l, &chan->srej_l, list) { 35750a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 3576525cd185SGustavo F. Padovan l2cap_resend_srejframe(chan, tx_seq); 35770a708f8fSGustavo F. Padovan return 0; 35780a708f8fSGustavo F. Padovan } 35790a708f8fSGustavo F. Padovan } 3580525cd185SGustavo F. Padovan l2cap_send_srejframe(chan, tx_seq); 35810a708f8fSGustavo F. Padovan } 35820a708f8fSGustavo F. Padovan } else { 35830a708f8fSGustavo F. Padovan expected_tx_seq_offset = 358442e5c802SGustavo F. Padovan (chan->expected_tx_seq - chan->buffer_seq) % 64; 35850a708f8fSGustavo F. Padovan if (expected_tx_seq_offset < 0) 35860a708f8fSGustavo F. Padovan expected_tx_seq_offset += 64; 35870a708f8fSGustavo F. Padovan 35880a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 35890a708f8fSGustavo F. Padovan if (tx_seq_offset < expected_tx_seq_offset) 35900a708f8fSGustavo F. Padovan goto drop; 35910a708f8fSGustavo F. Padovan 3592525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SREJ_SENT; 35930a708f8fSGustavo F. Padovan 359449208c9cSGustavo F. Padovan BT_DBG("chan %p, Enter SREJ", chan); 35950a708f8fSGustavo F. Padovan 359639d5a3eeSGustavo F. Padovan INIT_LIST_HEAD(&chan->srej_l); 359742e5c802SGustavo F. Padovan chan->buffer_seq_srej = chan->buffer_seq; 35980a708f8fSGustavo F. Padovan 3599f1c6775bSGustavo F. Padovan __skb_queue_head_init(&chan->srej_q); 3600f1c6775bSGustavo F. Padovan __skb_queue_head_init(&chan->busy_q); 360142e5c802SGustavo F. Padovan l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); 36020a708f8fSGustavo F. Padovan 3603525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_PBIT; 36040a708f8fSGustavo F. Padovan 3605525cd185SGustavo F. Padovan l2cap_send_srejframe(chan, tx_seq); 36060a708f8fSGustavo F. Padovan 3607e92c8e70SGustavo F. Padovan del_timer(&chan->ack_timer); 36080a708f8fSGustavo F. Padovan } 36090a708f8fSGustavo F. Padovan return 0; 36100a708f8fSGustavo F. Padovan 36110a708f8fSGustavo F. Padovan expected: 361242e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 36130a708f8fSGustavo F. Padovan 3614525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { 36150a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 36160a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 3617f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->srej_q, skb); 36180a708f8fSGustavo F. Padovan return 0; 36190a708f8fSGustavo F. Padovan } 36200a708f8fSGustavo F. Padovan 3621525cd185SGustavo F. Padovan err = l2cap_push_rx_skb(chan, skb, rx_control); 36220a708f8fSGustavo F. Padovan if (err < 0) 36230a708f8fSGustavo F. Padovan return 0; 36240a708f8fSGustavo F. Padovan 36250a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 3626525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REJ_ACT) 3627525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REJ_ACT; 36280a708f8fSGustavo F. Padovan else 3629525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 36300a708f8fSGustavo F. Padovan } 36310a708f8fSGustavo F. Padovan 36320a708f8fSGustavo F. Padovan __mod_ack_timer(); 36330a708f8fSGustavo F. Padovan 36346a026610SGustavo F. Padovan chan->num_acked = (chan->num_acked + 1) % num_to_ack; 36356a026610SGustavo F. Padovan if (chan->num_acked == num_to_ack - 1) 3636525cd185SGustavo F. Padovan l2cap_send_ack(chan); 36370a708f8fSGustavo F. Padovan 36380a708f8fSGustavo F. Padovan return 0; 36390a708f8fSGustavo F. Padovan 36400a708f8fSGustavo F. Padovan drop: 36410a708f8fSGustavo F. Padovan kfree_skb(skb); 36420a708f8fSGustavo F. Padovan return 0; 36430a708f8fSGustavo F. Padovan } 36440a708f8fSGustavo F. Padovan 3645525cd185SGustavo F. Padovan static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) 36460a708f8fSGustavo F. Padovan { 364749208c9cSGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), 36480a708f8fSGustavo F. Padovan rx_control); 36490a708f8fSGustavo F. Padovan 365042e5c802SGustavo F. Padovan chan->expected_ack_seq = __get_reqseq(rx_control); 365142e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 36520a708f8fSGustavo F. Padovan 36530a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 3654525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_FBIT; 3655525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { 3656525cd185SGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && 36576a026610SGustavo F. Padovan (chan->unacked_frames > 0)) 36580a708f8fSGustavo F. Padovan __mod_retrans_timer(); 36590a708f8fSGustavo F. Padovan 3660525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 3661525cd185SGustavo F. Padovan l2cap_send_srejtail(chan); 36620a708f8fSGustavo F. Padovan } else { 3663525cd185SGustavo F. Padovan l2cap_send_i_or_rr_or_rnr(chan); 36640a708f8fSGustavo F. Padovan } 36650a708f8fSGustavo F. Padovan 36660a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 3667525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 36680a708f8fSGustavo F. Padovan 3669525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REJ_ACT) 3670525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REJ_ACT; 36710a708f8fSGustavo F. Padovan else 3672525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 36730a708f8fSGustavo F. Padovan 36740a708f8fSGustavo F. Padovan } else { 3675525cd185SGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && 36766a026610SGustavo F. Padovan (chan->unacked_frames > 0)) 36770a708f8fSGustavo F. Padovan __mod_retrans_timer(); 36780a708f8fSGustavo F. Padovan 3679525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 3680525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) 3681525cd185SGustavo F. Padovan l2cap_send_ack(chan); 36820a708f8fSGustavo F. Padovan else 3683525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 36840a708f8fSGustavo F. Padovan } 36850a708f8fSGustavo F. Padovan } 36860a708f8fSGustavo F. Padovan 3687525cd185SGustavo F. Padovan static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) 36880a708f8fSGustavo F. Padovan { 36890a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 36900a708f8fSGustavo F. Padovan 3691525cd185SGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); 36920a708f8fSGustavo F. Padovan 3693525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 36940a708f8fSGustavo F. Padovan 369542e5c802SGustavo F. Padovan chan->expected_ack_seq = tx_seq; 369642e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 36970a708f8fSGustavo F. Padovan 36980a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 3699525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REJ_ACT) 3700525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REJ_ACT; 37010a708f8fSGustavo F. Padovan else 3702525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 37030a708f8fSGustavo F. Padovan } else { 3704525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 37050a708f8fSGustavo F. Padovan 3706525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_WAIT_F) 3707525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_REJ_ACT; 37080a708f8fSGustavo F. Padovan } 37090a708f8fSGustavo F. Padovan } 3710525cd185SGustavo F. Padovan static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) 37110a708f8fSGustavo F. Padovan { 37120a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 37130a708f8fSGustavo F. Padovan 3714525cd185SGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); 37150a708f8fSGustavo F. Padovan 3716525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 37170a708f8fSGustavo F. Padovan 37180a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 371942e5c802SGustavo F. Padovan chan->expected_ack_seq = tx_seq; 372042e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 37210a708f8fSGustavo F. Padovan 3722525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_FBIT; 3723525cd185SGustavo F. Padovan l2cap_retransmit_one_frame(chan, tx_seq); 37240a708f8fSGustavo F. Padovan 3725525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 37260a708f8fSGustavo F. Padovan 3727525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_WAIT_F) { 37286a026610SGustavo F. Padovan chan->srej_save_reqseq = tx_seq; 3729525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SREJ_ACT; 37300a708f8fSGustavo F. Padovan } 37310a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 3732525cd185SGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) && 37336a026610SGustavo F. Padovan chan->srej_save_reqseq == tx_seq) 3734525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SREJ_ACT; 37350a708f8fSGustavo F. Padovan else 3736525cd185SGustavo F. Padovan l2cap_retransmit_one_frame(chan, tx_seq); 37370a708f8fSGustavo F. Padovan } else { 3738525cd185SGustavo F. Padovan l2cap_retransmit_one_frame(chan, tx_seq); 3739525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_WAIT_F) { 37406a026610SGustavo F. Padovan chan->srej_save_reqseq = tx_seq; 3741525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SREJ_ACT; 37420a708f8fSGustavo F. Padovan } 37430a708f8fSGustavo F. Padovan } 37440a708f8fSGustavo F. Padovan } 37450a708f8fSGustavo F. Padovan 3746525cd185SGustavo F. Padovan static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) 37470a708f8fSGustavo F. Padovan { 37480a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 37490a708f8fSGustavo F. Padovan 3750525cd185SGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); 37510a708f8fSGustavo F. Padovan 3752525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_REMOTE_BUSY; 375342e5c802SGustavo F. Padovan chan->expected_ack_seq = tx_seq; 375442e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 37550a708f8fSGustavo F. Padovan 37560a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 3757525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_FBIT; 37580a708f8fSGustavo F. Padovan 3759525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) { 3760e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 37610a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 3762525cd185SGustavo F. Padovan l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); 37630a708f8fSGustavo F. Padovan return; 37640a708f8fSGustavo F. Padovan } 37650a708f8fSGustavo F. Padovan 37660a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 3767525cd185SGustavo F. Padovan l2cap_send_srejtail(chan); 37680a708f8fSGustavo F. Padovan else 3769525cd185SGustavo F. Padovan l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); 37700a708f8fSGustavo F. Padovan } 37710a708f8fSGustavo F. Padovan 3772525cd185SGustavo F. Padovan static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) 37730a708f8fSGustavo F. Padovan { 3774525cd185SGustavo F. Padovan BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); 37750a708f8fSGustavo F. Padovan 37760a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 3777525cd185SGustavo F. Padovan chan->conn_state & L2CAP_CONN_WAIT_F) { 3778e92c8e70SGustavo F. Padovan del_timer(&chan->monitor_timer); 37796a026610SGustavo F. Padovan if (chan->unacked_frames > 0) 37800a708f8fSGustavo F. Padovan __mod_retrans_timer(); 3781525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_WAIT_F; 37820a708f8fSGustavo F. Padovan } 37830a708f8fSGustavo F. Padovan 37840a708f8fSGustavo F. Padovan switch (rx_control & L2CAP_CTRL_SUPERVISE) { 37850a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_READY: 3786525cd185SGustavo F. Padovan l2cap_data_channel_rrframe(chan, rx_control); 37870a708f8fSGustavo F. Padovan break; 37880a708f8fSGustavo F. Padovan 37890a708f8fSGustavo F. Padovan case L2CAP_SUPER_REJECT: 3790525cd185SGustavo F. Padovan l2cap_data_channel_rejframe(chan, rx_control); 37910a708f8fSGustavo F. Padovan break; 37920a708f8fSGustavo F. Padovan 37930a708f8fSGustavo F. Padovan case L2CAP_SUPER_SELECT_REJECT: 3794525cd185SGustavo F. Padovan l2cap_data_channel_srejframe(chan, rx_control); 37950a708f8fSGustavo F. Padovan break; 37960a708f8fSGustavo F. Padovan 37970a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_NOT_READY: 3798525cd185SGustavo F. Padovan l2cap_data_channel_rnrframe(chan, rx_control); 37990a708f8fSGustavo F. Padovan break; 38000a708f8fSGustavo F. Padovan } 38010a708f8fSGustavo F. Padovan 38020a708f8fSGustavo F. Padovan kfree_skb(skb); 38030a708f8fSGustavo F. Padovan return 0; 38040a708f8fSGustavo F. Padovan } 38050a708f8fSGustavo F. Padovan 38060a708f8fSGustavo F. Padovan static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) 38070a708f8fSGustavo F. Padovan { 3808525cd185SGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 38090a708f8fSGustavo F. Padovan u16 control; 38100a708f8fSGustavo F. Padovan u8 req_seq; 38110a708f8fSGustavo F. Padovan int len, next_tx_seq_offset, req_seq_offset; 38120a708f8fSGustavo F. Padovan 38130a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 38140a708f8fSGustavo F. Padovan skb_pull(skb, 2); 38150a708f8fSGustavo F. Padovan len = skb->len; 38160a708f8fSGustavo F. Padovan 38170a708f8fSGustavo F. Padovan /* 38180a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 38190a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 38200a708f8fSGustavo F. Padovan * procedures and ask retransmission. 38210a708f8fSGustavo F. Padovan */ 382247d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 38230a708f8fSGustavo F. Padovan goto drop; 38240a708f8fSGustavo F. Padovan 38250a708f8fSGustavo F. Padovan if (__is_sar_start(control) && __is_iframe(control)) 38260a708f8fSGustavo F. Padovan len -= 2; 38270a708f8fSGustavo F. Padovan 382847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 38290a708f8fSGustavo F. Padovan len -= 2; 38300a708f8fSGustavo F. Padovan 383147d1ec61SGustavo F. Padovan if (len > chan->mps) { 38328c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 38330a708f8fSGustavo F. Padovan goto drop; 38340a708f8fSGustavo F. Padovan } 38350a708f8fSGustavo F. Padovan 38360a708f8fSGustavo F. Padovan req_seq = __get_reqseq(control); 383742e5c802SGustavo F. Padovan req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; 38380a708f8fSGustavo F. Padovan if (req_seq_offset < 0) 38390a708f8fSGustavo F. Padovan req_seq_offset += 64; 38400a708f8fSGustavo F. Padovan 38410a708f8fSGustavo F. Padovan next_tx_seq_offset = 384242e5c802SGustavo F. Padovan (chan->next_tx_seq - chan->expected_ack_seq) % 64; 38430a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 38440a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 38450a708f8fSGustavo F. Padovan 38460a708f8fSGustavo F. Padovan /* check for invalid req-seq */ 38470a708f8fSGustavo F. Padovan if (req_seq_offset > next_tx_seq_offset) { 38488c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 38490a708f8fSGustavo F. Padovan goto drop; 38500a708f8fSGustavo F. Padovan } 38510a708f8fSGustavo F. Padovan 38520a708f8fSGustavo F. Padovan if (__is_iframe(control)) { 38530a708f8fSGustavo F. Padovan if (len < 0) { 38548c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 38550a708f8fSGustavo F. Padovan goto drop; 38560a708f8fSGustavo F. Padovan } 38570a708f8fSGustavo F. Padovan 3858525cd185SGustavo F. Padovan l2cap_data_channel_iframe(chan, control, skb); 38590a708f8fSGustavo F. Padovan } else { 38600a708f8fSGustavo F. Padovan if (len != 0) { 38610a708f8fSGustavo F. Padovan BT_ERR("%d", len); 38628c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 38630a708f8fSGustavo F. Padovan goto drop; 38640a708f8fSGustavo F. Padovan } 38650a708f8fSGustavo F. Padovan 3866525cd185SGustavo F. Padovan l2cap_data_channel_sframe(chan, control, skb); 38670a708f8fSGustavo F. Padovan } 38680a708f8fSGustavo F. Padovan 38690a708f8fSGustavo F. Padovan return 0; 38700a708f8fSGustavo F. Padovan 38710a708f8fSGustavo F. Padovan drop: 38720a708f8fSGustavo F. Padovan kfree_skb(skb); 38730a708f8fSGustavo F. Padovan return 0; 38740a708f8fSGustavo F. Padovan } 38750a708f8fSGustavo F. Padovan 38760a708f8fSGustavo F. Padovan static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) 38770a708f8fSGustavo F. Padovan { 387848454079SGustavo F. Padovan struct l2cap_chan *chan; 3879bf734843SDavid S. Miller struct sock *sk = NULL; 38800a708f8fSGustavo F. Padovan u16 control; 38810a708f8fSGustavo F. Padovan u8 tx_seq; 38820a708f8fSGustavo F. Padovan int len; 38830a708f8fSGustavo F. Padovan 3884baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 388548454079SGustavo F. Padovan if (!chan) { 38860a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 38870a708f8fSGustavo F. Padovan goto drop; 38880a708f8fSGustavo F. Padovan } 38890a708f8fSGustavo F. Padovan 389048454079SGustavo F. Padovan sk = chan->sk; 38910a708f8fSGustavo F. Padovan 389249208c9cSGustavo F. Padovan BT_DBG("chan %p, len %d", chan, skb->len); 38930a708f8fSGustavo F. Padovan 389489bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 38950a708f8fSGustavo F. Padovan goto drop; 38960a708f8fSGustavo F. Padovan 38970c1bc5c6SGustavo F. Padovan switch (chan->mode) { 38980a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 38990a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 39000a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 39010a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 39020a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 39030a708f8fSGustavo F. Padovan 39040c1bc5c6SGustavo F. Padovan if (chan->imtu < skb->len) 39050a708f8fSGustavo F. Padovan goto drop; 39060a708f8fSGustavo F. Padovan 390723070494SGustavo F. Padovan if (!chan->ops->recv(chan->data, skb)) 39080a708f8fSGustavo F. Padovan goto done; 39090a708f8fSGustavo F. Padovan break; 39100a708f8fSGustavo F. Padovan 39110a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 39120a708f8fSGustavo F. Padovan if (!sock_owned_by_user(sk)) { 39130a708f8fSGustavo F. Padovan l2cap_ertm_data_rcv(sk, skb); 39140a708f8fSGustavo F. Padovan } else { 39150a708f8fSGustavo F. Padovan if (sk_add_backlog(sk, skb)) 39160a708f8fSGustavo F. Padovan goto drop; 39170a708f8fSGustavo F. Padovan } 39180a708f8fSGustavo F. Padovan 39190a708f8fSGustavo F. Padovan goto done; 39200a708f8fSGustavo F. Padovan 39210a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 39220a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 39230a708f8fSGustavo F. Padovan skb_pull(skb, 2); 39240a708f8fSGustavo F. Padovan len = skb->len; 39250a708f8fSGustavo F. Padovan 392647d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 39270a708f8fSGustavo F. Padovan goto drop; 39280a708f8fSGustavo F. Padovan 39290a708f8fSGustavo F. Padovan if (__is_sar_start(control)) 39300a708f8fSGustavo F. Padovan len -= 2; 39310a708f8fSGustavo F. Padovan 393247d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 39330a708f8fSGustavo F. Padovan len -= 2; 39340a708f8fSGustavo F. Padovan 393547d1ec61SGustavo F. Padovan if (len > chan->mps || len < 0 || __is_sframe(control)) 39360a708f8fSGustavo F. Padovan goto drop; 39370a708f8fSGustavo F. Padovan 39380a708f8fSGustavo F. Padovan tx_seq = __get_txseq(control); 39390a708f8fSGustavo F. Padovan 394042e5c802SGustavo F. Padovan if (chan->expected_tx_seq == tx_seq) 394142e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 39420a708f8fSGustavo F. Padovan else 394342e5c802SGustavo F. Padovan chan->expected_tx_seq = (tx_seq + 1) % 64; 39440a708f8fSGustavo F. Padovan 3945525cd185SGustavo F. Padovan l2cap_streaming_reassembly_sdu(chan, skb, control); 39460a708f8fSGustavo F. Padovan 39470a708f8fSGustavo F. Padovan goto done; 39480a708f8fSGustavo F. Padovan 39490a708f8fSGustavo F. Padovan default: 39500c1bc5c6SGustavo F. Padovan BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); 39510a708f8fSGustavo F. Padovan break; 39520a708f8fSGustavo F. Padovan } 39530a708f8fSGustavo F. Padovan 39540a708f8fSGustavo F. Padovan drop: 39550a708f8fSGustavo F. Padovan kfree_skb(skb); 39560a708f8fSGustavo F. Padovan 39570a708f8fSGustavo F. Padovan done: 39580a708f8fSGustavo F. Padovan if (sk) 39590a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 39600a708f8fSGustavo F. Padovan 39610a708f8fSGustavo F. Padovan return 0; 39620a708f8fSGustavo F. Padovan } 39630a708f8fSGustavo F. Padovan 39640a708f8fSGustavo F. Padovan static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) 39650a708f8fSGustavo F. Padovan { 39666dcae1eaSDavid S. Miller struct sock *sk = NULL; 396723691d75SGustavo F. Padovan struct l2cap_chan *chan; 39680a708f8fSGustavo F. Padovan 396923691d75SGustavo F. Padovan chan = l2cap_global_chan_by_psm(0, psm, conn->src); 397023691d75SGustavo F. Padovan if (!chan) 39710a708f8fSGustavo F. Padovan goto drop; 39720a708f8fSGustavo F. Padovan 397323691d75SGustavo F. Padovan sk = chan->sk; 397423691d75SGustavo F. Padovan 39750a708f8fSGustavo F. Padovan bh_lock_sock(sk); 39760a708f8fSGustavo F. Padovan 39770a708f8fSGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 39780a708f8fSGustavo F. Padovan 397989bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 39800a708f8fSGustavo F. Padovan goto drop; 39810a708f8fSGustavo F. Padovan 39820c1bc5c6SGustavo F. Padovan if (l2cap_pi(sk)->chan->imtu < skb->len) 39830a708f8fSGustavo F. Padovan goto drop; 39840a708f8fSGustavo F. Padovan 398523070494SGustavo F. Padovan if (!chan->ops->recv(chan->data, skb)) 39860a708f8fSGustavo F. Padovan goto done; 39870a708f8fSGustavo F. Padovan 39880a708f8fSGustavo F. Padovan drop: 39890a708f8fSGustavo F. Padovan kfree_skb(skb); 39900a708f8fSGustavo F. Padovan 39910a708f8fSGustavo F. Padovan done: 39920a708f8fSGustavo F. Padovan if (sk) 39930a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 39940a708f8fSGustavo F. Padovan return 0; 39950a708f8fSGustavo F. Padovan } 39960a708f8fSGustavo F. Padovan 39979f69bda6SGustavo F. Padovan static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) 39989f69bda6SGustavo F. Padovan { 39996dcae1eaSDavid S. Miller struct sock *sk = NULL; 400023691d75SGustavo F. Padovan struct l2cap_chan *chan; 40019f69bda6SGustavo F. Padovan 400223691d75SGustavo F. Padovan chan = l2cap_global_chan_by_scid(0, cid, conn->src); 400323691d75SGustavo F. Padovan if (!chan) 40049f69bda6SGustavo F. Padovan goto drop; 40059f69bda6SGustavo F. Padovan 400623691d75SGustavo F. Padovan sk = chan->sk; 400723691d75SGustavo F. Padovan 40089f69bda6SGustavo F. Padovan bh_lock_sock(sk); 40099f69bda6SGustavo F. Padovan 40109f69bda6SGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 40119f69bda6SGustavo F. Padovan 401289bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 40139f69bda6SGustavo F. Padovan goto drop; 40149f69bda6SGustavo F. Padovan 40150c1bc5c6SGustavo F. Padovan if (l2cap_pi(sk)->chan->imtu < skb->len) 40169f69bda6SGustavo F. Padovan goto drop; 40179f69bda6SGustavo F. Padovan 401823070494SGustavo F. Padovan if (!chan->ops->recv(chan->data, skb)) 40199f69bda6SGustavo F. Padovan goto done; 40209f69bda6SGustavo F. Padovan 40219f69bda6SGustavo F. Padovan drop: 40229f69bda6SGustavo F. Padovan kfree_skb(skb); 40239f69bda6SGustavo F. Padovan 40249f69bda6SGustavo F. Padovan done: 40259f69bda6SGustavo F. Padovan if (sk) 40269f69bda6SGustavo F. Padovan bh_unlock_sock(sk); 40279f69bda6SGustavo F. Padovan return 0; 40289f69bda6SGustavo F. Padovan } 40299f69bda6SGustavo F. Padovan 40300a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 40310a708f8fSGustavo F. Padovan { 40320a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 40330a708f8fSGustavo F. Padovan u16 cid, len; 40340a708f8fSGustavo F. Padovan __le16 psm; 40350a708f8fSGustavo F. Padovan 40360a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 40370a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 40380a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 40390a708f8fSGustavo F. Padovan 40400a708f8fSGustavo F. Padovan if (len != skb->len) { 40410a708f8fSGustavo F. Padovan kfree_skb(skb); 40420a708f8fSGustavo F. Padovan return; 40430a708f8fSGustavo F. Padovan } 40440a708f8fSGustavo F. Padovan 40450a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 40460a708f8fSGustavo F. Padovan 40470a708f8fSGustavo F. Padovan switch (cid) { 40483300d9a9SClaudio Takahasi case L2CAP_CID_LE_SIGNALING: 40490a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 40500a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 40510a708f8fSGustavo F. Padovan break; 40520a708f8fSGustavo F. Padovan 40530a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 40540a708f8fSGustavo F. Padovan psm = get_unaligned_le16(skb->data); 40550a708f8fSGustavo F. Padovan skb_pull(skb, 2); 40560a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 40570a708f8fSGustavo F. Padovan break; 40580a708f8fSGustavo F. Padovan 40599f69bda6SGustavo F. Padovan case L2CAP_CID_LE_DATA: 40609f69bda6SGustavo F. Padovan l2cap_att_channel(conn, cid, skb); 40619f69bda6SGustavo F. Padovan break; 40629f69bda6SGustavo F. Padovan 40630a708f8fSGustavo F. Padovan default: 40640a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 40650a708f8fSGustavo F. Padovan break; 40660a708f8fSGustavo F. Padovan } 40670a708f8fSGustavo F. Padovan } 40680a708f8fSGustavo F. Padovan 40690a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 40700a708f8fSGustavo F. Padovan 40710a708f8fSGustavo F. Padovan static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) 40720a708f8fSGustavo F. Padovan { 40730a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 407423691d75SGustavo F. Padovan struct l2cap_chan *c; 40750a708f8fSGustavo F. Padovan 40760a708f8fSGustavo F. Padovan if (type != ACL_LINK) 40770a708f8fSGustavo F. Padovan return -EINVAL; 40780a708f8fSGustavo F. Padovan 40790a708f8fSGustavo F. Padovan BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); 40800a708f8fSGustavo F. Padovan 40810a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 408223691d75SGustavo F. Padovan read_lock(&chan_list_lock); 408323691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 408423691d75SGustavo F. Padovan struct sock *sk = c->sk; 40854343478fSGustavo F. Padovan 408689bc500eSGustavo F. Padovan if (c->state != BT_LISTEN) 40870a708f8fSGustavo F. Padovan continue; 40880a708f8fSGustavo F. Padovan 40890a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { 40900a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 409123691d75SGustavo F. Padovan if (c->role_switch) 40920a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 40930a708f8fSGustavo F. Padovan exact++; 40940a708f8fSGustavo F. Padovan } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { 40950a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 409623691d75SGustavo F. Padovan if (c->role_switch) 40970a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 40980a708f8fSGustavo F. Padovan } 40990a708f8fSGustavo F. Padovan } 410023691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 41010a708f8fSGustavo F. Padovan 41020a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 41030a708f8fSGustavo F. Padovan } 41040a708f8fSGustavo F. Padovan 41050a708f8fSGustavo F. Padovan static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 41060a708f8fSGustavo F. Padovan { 41070a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 41080a708f8fSGustavo F. Padovan 41090a708f8fSGustavo F. Padovan BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); 41100a708f8fSGustavo F. Padovan 4111acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 41120a708f8fSGustavo F. Padovan return -EINVAL; 41130a708f8fSGustavo F. Padovan 41140a708f8fSGustavo F. Padovan if (!status) { 41150a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, status); 41160a708f8fSGustavo F. Padovan if (conn) 41170a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 41180a708f8fSGustavo F. Padovan } else 41190a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(status)); 41200a708f8fSGustavo F. Padovan 41210a708f8fSGustavo F. Padovan return 0; 41220a708f8fSGustavo F. Padovan } 41230a708f8fSGustavo F. Padovan 41240a708f8fSGustavo F. Padovan static int l2cap_disconn_ind(struct hci_conn *hcon) 41250a708f8fSGustavo F. Padovan { 41260a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 41270a708f8fSGustavo F. Padovan 41280a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 41290a708f8fSGustavo F. Padovan 41300a708f8fSGustavo F. Padovan if (hcon->type != ACL_LINK || !conn) 41310a708f8fSGustavo F. Padovan return 0x13; 41320a708f8fSGustavo F. Padovan 41330a708f8fSGustavo F. Padovan return conn->disc_reason; 41340a708f8fSGustavo F. Padovan } 41350a708f8fSGustavo F. Padovan 41360a708f8fSGustavo F. Padovan static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 41370a708f8fSGustavo F. Padovan { 41380a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 41390a708f8fSGustavo F. Padovan 4140acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 41410a708f8fSGustavo F. Padovan return -EINVAL; 41420a708f8fSGustavo F. Padovan 41430a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(reason)); 41440a708f8fSGustavo F. Padovan 41450a708f8fSGustavo F. Padovan return 0; 41460a708f8fSGustavo F. Padovan } 41470a708f8fSGustavo F. Padovan 41484343478fSGustavo F. Padovan static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) 41490a708f8fSGustavo F. Padovan { 4150715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) 41510a708f8fSGustavo F. Padovan return; 41520a708f8fSGustavo F. Padovan 41530a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 41544343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) { 4155ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 4156ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ * 5); 41574343478fSGustavo F. Padovan } else if (chan->sec_level == BT_SECURITY_HIGH) 41580f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNREFUSED); 41590a708f8fSGustavo F. Padovan } else { 41604343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) 4161ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 41620a708f8fSGustavo F. Padovan } 41630a708f8fSGustavo F. Padovan } 41640a708f8fSGustavo F. Padovan 41650a708f8fSGustavo F. Padovan static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 41660a708f8fSGustavo F. Padovan { 41670a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 416848454079SGustavo F. Padovan struct l2cap_chan *chan; 41690a708f8fSGustavo F. Padovan 41700a708f8fSGustavo F. Padovan if (!conn) 41710a708f8fSGustavo F. Padovan return 0; 41720a708f8fSGustavo F. Padovan 41730a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 41740a708f8fSGustavo F. Padovan 4175baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 41760a708f8fSGustavo F. Padovan 4177baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 417848454079SGustavo F. Padovan struct sock *sk = chan->sk; 4179baa7e1faSGustavo F. Padovan 41800a708f8fSGustavo F. Padovan bh_lock_sock(sk); 41810a708f8fSGustavo F. Padovan 4182b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_CONNECT_PEND) { 41830a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 41840a708f8fSGustavo F. Padovan continue; 41850a708f8fSGustavo F. Padovan } 41860a708f8fSGustavo F. Padovan 418789bc500eSGustavo F. Padovan if (!status && (chan->state == BT_CONNECTED || 418889bc500eSGustavo F. Padovan chan->state == BT_CONFIG)) { 41894343478fSGustavo F. Padovan l2cap_check_encryption(chan, encrypt); 41900a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 41910a708f8fSGustavo F. Padovan continue; 41920a708f8fSGustavo F. Padovan } 41930a708f8fSGustavo F. Padovan 419489bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 41950a708f8fSGustavo F. Padovan if (!status) { 41960a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 4197fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 4198fe4128e0SGustavo F. Padovan req.psm = chan->psm; 41990a708f8fSGustavo F. Padovan 4200fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 4201b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_CONNECT_PEND; 42020a708f8fSGustavo F. Padovan 4203fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 42040a708f8fSGustavo F. Padovan L2CAP_CONN_REQ, sizeof(req), &req); 42050a708f8fSGustavo F. Padovan } else { 4206ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 4207ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 10); 42080a708f8fSGustavo F. Padovan } 420989bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 42100a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 42110a708f8fSGustavo F. Padovan __u16 result; 42120a708f8fSGustavo F. Padovan 42130a708f8fSGustavo F. Padovan if (!status) { 421489bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 42150a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 42160a708f8fSGustavo F. Padovan } else { 421789bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_DISCONN); 4218ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 10); 42190a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 42200a708f8fSGustavo F. Padovan } 42210a708f8fSGustavo F. Padovan 4222fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 4223fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 42240a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 42250a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 4226fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 4227fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 42280a708f8fSGustavo F. Padovan } 42290a708f8fSGustavo F. Padovan 42300a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 42310a708f8fSGustavo F. Padovan } 42320a708f8fSGustavo F. Padovan 4233baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 42340a708f8fSGustavo F. Padovan 42350a708f8fSGustavo F. Padovan return 0; 42360a708f8fSGustavo F. Padovan } 42370a708f8fSGustavo F. Padovan 42380a708f8fSGustavo F. Padovan static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 42390a708f8fSGustavo F. Padovan { 42400a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 42410a708f8fSGustavo F. Padovan 42420a708f8fSGustavo F. Padovan if (!conn) 42430a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 42440a708f8fSGustavo F. Padovan 42450a708f8fSGustavo F. Padovan if (!conn) 42460a708f8fSGustavo F. Padovan goto drop; 42470a708f8fSGustavo F. Padovan 42480a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 42490a708f8fSGustavo F. Padovan 42500a708f8fSGustavo F. Padovan if (!(flags & ACL_CONT)) { 42510a708f8fSGustavo F. Padovan struct l2cap_hdr *hdr; 425248454079SGustavo F. Padovan struct l2cap_chan *chan; 42530a708f8fSGustavo F. Padovan u16 cid; 42540a708f8fSGustavo F. Padovan int len; 42550a708f8fSGustavo F. Padovan 42560a708f8fSGustavo F. Padovan if (conn->rx_len) { 42570a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 42580a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 42590a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 42600a708f8fSGustavo F. Padovan conn->rx_len = 0; 42610a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 42620a708f8fSGustavo F. Padovan } 42630a708f8fSGustavo F. Padovan 42640a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 42650a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 42660a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 42670a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 42680a708f8fSGustavo F. Padovan goto drop; 42690a708f8fSGustavo F. Padovan } 42700a708f8fSGustavo F. Padovan 42710a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 42720a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 42730a708f8fSGustavo F. Padovan cid = __le16_to_cpu(hdr->cid); 42740a708f8fSGustavo F. Padovan 42750a708f8fSGustavo F. Padovan if (len == skb->len) { 42760a708f8fSGustavo F. Padovan /* Complete frame received */ 42770a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 42780a708f8fSGustavo F. Padovan return 0; 42790a708f8fSGustavo F. Padovan } 42800a708f8fSGustavo F. Padovan 42810a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 42820a708f8fSGustavo F. Padovan 42830a708f8fSGustavo F. Padovan if (skb->len > len) { 42840a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 42850a708f8fSGustavo F. Padovan skb->len, len); 42860a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 42870a708f8fSGustavo F. Padovan goto drop; 42880a708f8fSGustavo F. Padovan } 42890a708f8fSGustavo F. Padovan 4290baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 42910a708f8fSGustavo F. Padovan 429248454079SGustavo F. Padovan if (chan && chan->sk) { 429348454079SGustavo F. Padovan struct sock *sk = chan->sk; 429448454079SGustavo F. Padovan 42950c1bc5c6SGustavo F. Padovan if (chan->imtu < len - L2CAP_HDR_SIZE) { 429648454079SGustavo F. Padovan BT_ERR("Frame exceeding recv MTU (len %d, " 429748454079SGustavo F. Padovan "MTU %d)", len, 42980c1bc5c6SGustavo F. Padovan chan->imtu); 42990a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 43000a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 43010a708f8fSGustavo F. Padovan goto drop; 43020a708f8fSGustavo F. Padovan } 43030a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 430448454079SGustavo F. Padovan } 43050a708f8fSGustavo F. Padovan 43060a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 43070a708f8fSGustavo F. Padovan conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); 43080a708f8fSGustavo F. Padovan if (!conn->rx_skb) 43090a708f8fSGustavo F. Padovan goto drop; 43100a708f8fSGustavo F. Padovan 43110a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 43120a708f8fSGustavo F. Padovan skb->len); 43130a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 43140a708f8fSGustavo F. Padovan } else { 43150a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 43160a708f8fSGustavo F. Padovan 43170a708f8fSGustavo F. Padovan if (!conn->rx_len) { 43180a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 43190a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 43200a708f8fSGustavo F. Padovan goto drop; 43210a708f8fSGustavo F. Padovan } 43220a708f8fSGustavo F. Padovan 43230a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 43240a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 43250a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 43260a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 43270a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 43280a708f8fSGustavo F. Padovan conn->rx_len = 0; 43290a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 43300a708f8fSGustavo F. Padovan goto drop; 43310a708f8fSGustavo F. Padovan } 43320a708f8fSGustavo F. Padovan 43330a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 43340a708f8fSGustavo F. Padovan skb->len); 43350a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 43360a708f8fSGustavo F. Padovan 43370a708f8fSGustavo F. Padovan if (!conn->rx_len) { 43380a708f8fSGustavo F. Padovan /* Complete frame received */ 43390a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, conn->rx_skb); 43400a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 43410a708f8fSGustavo F. Padovan } 43420a708f8fSGustavo F. Padovan } 43430a708f8fSGustavo F. Padovan 43440a708f8fSGustavo F. Padovan drop: 43450a708f8fSGustavo F. Padovan kfree_skb(skb); 43460a708f8fSGustavo F. Padovan return 0; 43470a708f8fSGustavo F. Padovan } 43480a708f8fSGustavo F. Padovan 43490a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 43500a708f8fSGustavo F. Padovan { 435123691d75SGustavo F. Padovan struct l2cap_chan *c; 43520a708f8fSGustavo F. Padovan 435323691d75SGustavo F. Padovan read_lock_bh(&chan_list_lock); 43540a708f8fSGustavo F. Padovan 435523691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 435623691d75SGustavo F. Padovan struct sock *sk = c->sk; 43570a708f8fSGustavo F. Padovan 4358903d343eSGustavo F. Padovan seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 43590a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->src), 43600a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->dst), 436189bc500eSGustavo F. Padovan c->state, __le16_to_cpu(c->psm), 436223691d75SGustavo F. Padovan c->scid, c->dcid, c->imtu, c->omtu, 436323691d75SGustavo F. Padovan c->sec_level, c->mode); 43640a708f8fSGustavo F. Padovan } 43650a708f8fSGustavo F. Padovan 436623691d75SGustavo F. Padovan read_unlock_bh(&chan_list_lock); 43670a708f8fSGustavo F. Padovan 43680a708f8fSGustavo F. Padovan return 0; 43690a708f8fSGustavo F. Padovan } 43700a708f8fSGustavo F. Padovan 43710a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 43720a708f8fSGustavo F. Padovan { 43730a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 43740a708f8fSGustavo F. Padovan } 43750a708f8fSGustavo F. Padovan 43760a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 43770a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 43780a708f8fSGustavo F. Padovan .read = seq_read, 43790a708f8fSGustavo F. Padovan .llseek = seq_lseek, 43800a708f8fSGustavo F. Padovan .release = single_release, 43810a708f8fSGustavo F. Padovan }; 43820a708f8fSGustavo F. Padovan 43830a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 43840a708f8fSGustavo F. Padovan 43850a708f8fSGustavo F. Padovan static struct hci_proto l2cap_hci_proto = { 43860a708f8fSGustavo F. Padovan .name = "L2CAP", 43870a708f8fSGustavo F. Padovan .id = HCI_PROTO_L2CAP, 43880a708f8fSGustavo F. Padovan .connect_ind = l2cap_connect_ind, 43890a708f8fSGustavo F. Padovan .connect_cfm = l2cap_connect_cfm, 43900a708f8fSGustavo F. Padovan .disconn_ind = l2cap_disconn_ind, 43910a708f8fSGustavo F. Padovan .disconn_cfm = l2cap_disconn_cfm, 43920a708f8fSGustavo F. Padovan .security_cfm = l2cap_security_cfm, 43930a708f8fSGustavo F. Padovan .recv_acldata = l2cap_recv_acldata 43940a708f8fSGustavo F. Padovan }; 43950a708f8fSGustavo F. Padovan 439664274518SGustavo F. Padovan int __init l2cap_init(void) 43970a708f8fSGustavo F. Padovan { 43980a708f8fSGustavo F. Padovan int err; 43990a708f8fSGustavo F. Padovan 4400bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 44010a708f8fSGustavo F. Padovan if (err < 0) 44020a708f8fSGustavo F. Padovan return err; 44030a708f8fSGustavo F. Padovan 44040a708f8fSGustavo F. Padovan _busy_wq = create_singlethread_workqueue("l2cap"); 44050a708f8fSGustavo F. Padovan if (!_busy_wq) { 4406bb58f747SGustavo F. Padovan err = -ENOMEM; 44070a708f8fSGustavo F. Padovan goto error; 44080a708f8fSGustavo F. Padovan } 44090a708f8fSGustavo F. Padovan 44100a708f8fSGustavo F. Padovan err = hci_register_proto(&l2cap_hci_proto); 44110a708f8fSGustavo F. Padovan if (err < 0) { 44120a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol registration failed"); 44130a708f8fSGustavo F. Padovan bt_sock_unregister(BTPROTO_L2CAP); 44140a708f8fSGustavo F. Padovan goto error; 44150a708f8fSGustavo F. Padovan } 44160a708f8fSGustavo F. Padovan 44170a708f8fSGustavo F. Padovan if (bt_debugfs) { 44180a708f8fSGustavo F. Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, 44190a708f8fSGustavo F. Padovan bt_debugfs, NULL, &l2cap_debugfs_fops); 44200a708f8fSGustavo F. Padovan if (!l2cap_debugfs) 44210a708f8fSGustavo F. Padovan BT_ERR("Failed to create L2CAP debug file"); 44220a708f8fSGustavo F. Padovan } 44230a708f8fSGustavo F. Padovan 44240a708f8fSGustavo F. Padovan return 0; 44250a708f8fSGustavo F. Padovan 44260a708f8fSGustavo F. Padovan error: 44270a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 4428bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 44290a708f8fSGustavo F. Padovan return err; 44300a708f8fSGustavo F. Padovan } 44310a708f8fSGustavo F. Padovan 443264274518SGustavo F. Padovan void l2cap_exit(void) 44330a708f8fSGustavo F. Padovan { 44340a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 44350a708f8fSGustavo F. Padovan 44360a708f8fSGustavo F. Padovan flush_workqueue(_busy_wq); 44370a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 44380a708f8fSGustavo F. Padovan 44390a708f8fSGustavo F. Padovan if (hci_unregister_proto(&l2cap_hci_proto) < 0) 44400a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol unregistration failed"); 44410a708f8fSGustavo F. Padovan 4442bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 44430a708f8fSGustavo F. Padovan } 44440a708f8fSGustavo F. Padovan 44450a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 44460a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 4447