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 ---- */ 81baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) 820a708f8fSGustavo F. Padovan { 8348454079SGustavo F. Padovan struct l2cap_chan *c; 84baa7e1faSGustavo F. Padovan 85baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 86fe4128e0SGustavo F. Padovan if (c->dcid == cid) 8748454079SGustavo F. Padovan return c; 880a708f8fSGustavo F. Padovan } 89baa7e1faSGustavo F. Padovan return NULL; 90baa7e1faSGustavo F. Padovan 91baa7e1faSGustavo F. Padovan } 920a708f8fSGustavo F. Padovan 93baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_scid(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->scid == cid) 9948454079SGustavo F. Padovan return c; 1000a708f8fSGustavo F. Padovan } 101baa7e1faSGustavo F. Padovan return NULL; 102baa7e1faSGustavo F. Padovan } 1030a708f8fSGustavo F. Padovan 1040a708f8fSGustavo F. Padovan /* Find channel with given SCID. 1050a708f8fSGustavo F. Padovan * Returns locked socket */ 106baa7e1faSGustavo F. Padovan static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) 1070a708f8fSGustavo F. Padovan { 10848454079SGustavo F. Padovan struct l2cap_chan *c; 109baa7e1faSGustavo F. Padovan 110baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 111baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_scid(conn, cid); 11248454079SGustavo F. Padovan if (c) 11348454079SGustavo F. Padovan bh_lock_sock(c->sk); 114baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 11548454079SGustavo F. Padovan return c; 1160a708f8fSGustavo F. Padovan } 1170a708f8fSGustavo F. Padovan 118baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) 1190a708f8fSGustavo F. Padovan { 12048454079SGustavo F. Padovan struct l2cap_chan *c; 121baa7e1faSGustavo F. Padovan 122baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 123fc7f8a7eSGustavo F. Padovan if (c->ident == ident) 12448454079SGustavo F. Padovan return c; 1250a708f8fSGustavo F. Padovan } 126baa7e1faSGustavo F. Padovan return NULL; 127baa7e1faSGustavo F. Padovan } 1280a708f8fSGustavo F. Padovan 129baa7e1faSGustavo F. Padovan static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) 1300a708f8fSGustavo F. Padovan { 13148454079SGustavo F. Padovan struct l2cap_chan *c; 132baa7e1faSGustavo F. Padovan 133baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 134baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_ident(conn, ident); 13548454079SGustavo F. Padovan if (c) 13648454079SGustavo F. Padovan bh_lock_sock(c->sk); 137baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 13848454079SGustavo F. Padovan return c; 1390a708f8fSGustavo F. Padovan } 1400a708f8fSGustavo F. Padovan 14123691d75SGustavo F. Padovan static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) 1429e4425ffSGustavo F. Padovan { 14323691d75SGustavo F. Padovan struct l2cap_chan *c; 1449e4425ffSGustavo F. Padovan 14523691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 14623691d75SGustavo F. Padovan if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) 1479e4425ffSGustavo F. Padovan goto found; 1489e4425ffSGustavo F. Padovan } 1499e4425ffSGustavo F. Padovan 15023691d75SGustavo F. Padovan c = NULL; 1519e4425ffSGustavo F. Padovan found: 15223691d75SGustavo F. Padovan return c; 1539e4425ffSGustavo F. Padovan } 1549e4425ffSGustavo F. Padovan 1559e4425ffSGustavo F. Padovan int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) 1569e4425ffSGustavo F. Padovan { 15773b2ec18SGustavo F. Padovan int err; 15873b2ec18SGustavo F. Padovan 15923691d75SGustavo F. Padovan write_lock_bh(&chan_list_lock); 1609e4425ffSGustavo F. Padovan 16123691d75SGustavo F. Padovan if (psm && __l2cap_global_chan_by_addr(psm, src)) { 16273b2ec18SGustavo F. Padovan err = -EADDRINUSE; 16373b2ec18SGustavo F. Padovan goto done; 1649e4425ffSGustavo F. Padovan } 1659e4425ffSGustavo F. Padovan 16673b2ec18SGustavo F. Padovan if (psm) { 1679e4425ffSGustavo F. Padovan chan->psm = psm; 1689e4425ffSGustavo F. Padovan chan->sport = psm; 16973b2ec18SGustavo F. Padovan err = 0; 17073b2ec18SGustavo F. Padovan } else { 17173b2ec18SGustavo F. Padovan u16 p; 1729e4425ffSGustavo F. Padovan 17373b2ec18SGustavo F. Padovan err = -EINVAL; 17473b2ec18SGustavo F. Padovan for (p = 0x1001; p < 0x1100; p += 2) 17523691d75SGustavo F. Padovan if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { 17673b2ec18SGustavo F. Padovan chan->psm = cpu_to_le16(p); 17773b2ec18SGustavo F. Padovan chan->sport = cpu_to_le16(p); 17873b2ec18SGustavo F. Padovan err = 0; 17973b2ec18SGustavo F. Padovan break; 18073b2ec18SGustavo F. Padovan } 18173b2ec18SGustavo F. Padovan } 18273b2ec18SGustavo F. Padovan 18373b2ec18SGustavo F. Padovan done: 18423691d75SGustavo F. Padovan write_unlock_bh(&chan_list_lock); 18573b2ec18SGustavo F. Padovan return err; 1869e4425ffSGustavo F. Padovan } 1879e4425ffSGustavo F. Padovan 1889e4425ffSGustavo F. Padovan int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) 1899e4425ffSGustavo F. Padovan { 19023691d75SGustavo F. Padovan write_lock_bh(&chan_list_lock); 1919e4425ffSGustavo F. Padovan 1929e4425ffSGustavo F. Padovan chan->scid = scid; 1939e4425ffSGustavo F. Padovan 19423691d75SGustavo F. Padovan write_unlock_bh(&chan_list_lock); 1959e4425ffSGustavo F. Padovan 1969e4425ffSGustavo F. Padovan return 0; 1979e4425ffSGustavo F. Padovan } 1989e4425ffSGustavo F. Padovan 199baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 2000a708f8fSGustavo F. Padovan { 2010a708f8fSGustavo F. Padovan u16 cid = L2CAP_CID_DYN_START; 2020a708f8fSGustavo F. Padovan 2030a708f8fSGustavo F. Padovan for (; cid < L2CAP_CID_DYN_END; cid++) { 204baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 2050a708f8fSGustavo F. Padovan return cid; 2060a708f8fSGustavo F. Padovan } 2070a708f8fSGustavo F. Padovan 2080a708f8fSGustavo F. Padovan return 0; 2090a708f8fSGustavo F. Padovan } 2100a708f8fSGustavo F. Padovan 211ab07801dSGustavo F. Padovan static void l2cap_chan_set_timer(struct l2cap_chan *chan, long timeout) 212ab07801dSGustavo F. Padovan { 213ab07801dSGustavo F. Padovan BT_DBG("chan %p state %d timeout %ld", chan->sk, chan->sk->sk_state, 214ab07801dSGustavo F. Padovan timeout); 215ab07801dSGustavo F. Padovan if (!mod_timer(&chan->chan_timer, jiffies + timeout)) 216ab07801dSGustavo F. Padovan sock_hold(chan->sk); 217ab07801dSGustavo F. Padovan } 218ab07801dSGustavo F. Padovan 219500698d3SGustavo F. Padovan static void l2cap_chan_clear_timer(struct l2cap_chan *chan) 220ab07801dSGustavo F. Padovan { 221ab07801dSGustavo F. Padovan BT_DBG("chan %p state %d", chan, chan->sk->sk_state); 222ab07801dSGustavo F. Padovan 223ab07801dSGustavo F. Padovan if (timer_pending(&chan->chan_timer) && del_timer(&chan->chan_timer)) 224ab07801dSGustavo F. Padovan __sock_put(chan->sk); 225ab07801dSGustavo F. Padovan } 226ab07801dSGustavo F. Padovan 227ab07801dSGustavo F. Padovan static void l2cap_chan_timeout(unsigned long arg) 228ab07801dSGustavo F. Padovan { 229ab07801dSGustavo F. Padovan struct l2cap_chan *chan = (struct l2cap_chan *) arg; 230ab07801dSGustavo F. Padovan struct sock *sk = chan->sk; 231ab07801dSGustavo F. Padovan int reason; 232ab07801dSGustavo F. Padovan 233ab07801dSGustavo F. Padovan BT_DBG("chan %p state %d", chan, sk->sk_state); 234ab07801dSGustavo F. Padovan 235ab07801dSGustavo F. Padovan bh_lock_sock(sk); 236ab07801dSGustavo F. Padovan 237ab07801dSGustavo F. Padovan if (sock_owned_by_user(sk)) { 238ab07801dSGustavo F. Padovan /* sk is owned by user. Try again later */ 239ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 5); 240ab07801dSGustavo F. Padovan bh_unlock_sock(sk); 241ab07801dSGustavo F. Padovan sock_put(sk); 242ab07801dSGustavo F. Padovan return; 243ab07801dSGustavo F. Padovan } 244ab07801dSGustavo F. Padovan 245ab07801dSGustavo F. Padovan if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) 246ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 247ab07801dSGustavo F. Padovan else if (sk->sk_state == BT_CONNECT && 248ab07801dSGustavo F. Padovan chan->sec_level != BT_SECURITY_SDP) 249ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 250ab07801dSGustavo F. Padovan else 251ab07801dSGustavo F. Padovan reason = ETIMEDOUT; 252ab07801dSGustavo F. Padovan 2530f852724SGustavo F. Padovan l2cap_chan_close(chan, reason); 254ab07801dSGustavo F. Padovan 255ab07801dSGustavo F. Padovan bh_unlock_sock(sk); 256ab07801dSGustavo F. Padovan 257ab07801dSGustavo F. Padovan l2cap_sock_kill(sk); 258ab07801dSGustavo F. Padovan sock_put(sk); 259ab07801dSGustavo F. Padovan } 260ab07801dSGustavo F. Padovan 26123691d75SGustavo F. Padovan struct l2cap_chan *l2cap_chan_create(struct sock *sk) 2620a708f8fSGustavo F. Padovan { 26348454079SGustavo F. Padovan struct l2cap_chan *chan; 2640a708f8fSGustavo F. Padovan 26548454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 26648454079SGustavo F. Padovan if (!chan) 26748454079SGustavo F. Padovan return NULL; 2680a708f8fSGustavo F. Padovan 26948454079SGustavo F. Padovan chan->sk = sk; 27048454079SGustavo F. Padovan 27123691d75SGustavo F. Padovan write_lock_bh(&chan_list_lock); 27223691d75SGustavo F. Padovan list_add(&chan->global_l, &chan_list); 27323691d75SGustavo F. Padovan write_unlock_bh(&chan_list_lock); 27423691d75SGustavo F. Padovan 275ab07801dSGustavo F. Padovan setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan); 276ab07801dSGustavo F. Padovan 27748454079SGustavo F. Padovan return chan; 2780a708f8fSGustavo F. Padovan } 2790a708f8fSGustavo F. Padovan 28023691d75SGustavo F. Padovan void l2cap_chan_destroy(struct l2cap_chan *chan) 2816ff5abbfSGustavo F. Padovan { 28223691d75SGustavo F. Padovan write_lock_bh(&chan_list_lock); 28323691d75SGustavo F. Padovan list_del(&chan->global_l); 28423691d75SGustavo F. Padovan write_unlock_bh(&chan_list_lock); 28523691d75SGustavo F. Padovan 2866ff5abbfSGustavo F. Padovan kfree(chan); 2876ff5abbfSGustavo F. Padovan } 2886ff5abbfSGustavo F. Padovan 28948454079SGustavo F. Padovan static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 2900a708f8fSGustavo F. Padovan { 29148454079SGustavo F. Padovan struct sock *sk = chan->sk; 2920a708f8fSGustavo F. Padovan 2930a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 294fe4128e0SGustavo F. Padovan chan->psm, chan->dcid); 2950a708f8fSGustavo F. Padovan 2960a708f8fSGustavo F. Padovan conn->disc_reason = 0x13; 2970a708f8fSGustavo F. Padovan 2988c1d787bSGustavo F. Padovan chan->conn = conn; 2990a708f8fSGustavo F. Padovan 300715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { 301b62f328bSVille Tervo if (conn->hcon->type == LE_LINK) { 302b62f328bSVille Tervo /* LE connection */ 3030c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_LE_DEFAULT_MTU; 304fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_LE_DATA; 305fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_LE_DATA; 306b62f328bSVille Tervo } else { 3070a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 308fe4128e0SGustavo F. Padovan chan->scid = l2cap_alloc_cid(conn); 3090c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 310b62f328bSVille Tervo } 311715ec005SGustavo F. Padovan } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 3120a708f8fSGustavo F. Padovan /* Connectionless socket */ 313fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_CONN_LESS; 314fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_CONN_LESS; 3150c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 3160a708f8fSGustavo F. Padovan } else { 3170a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 318fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_SIGNALING; 319fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_SIGNALING; 3200c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 3210a708f8fSGustavo F. Padovan } 3220a708f8fSGustavo F. Padovan 323baa7e1faSGustavo F. Padovan sock_hold(sk); 324baa7e1faSGustavo F. Padovan 325baa7e1faSGustavo F. Padovan list_add(&chan->list, &conn->chan_l); 3260a708f8fSGustavo F. Padovan } 3270a708f8fSGustavo F. Padovan 3280a708f8fSGustavo F. Padovan /* Delete channel. 3290a708f8fSGustavo F. Padovan * Must be called on the locked socket. */ 3304519de9aSGustavo F. Padovan static void l2cap_chan_del(struct l2cap_chan *chan, int err) 3310a708f8fSGustavo F. Padovan { 33248454079SGustavo F. Padovan struct sock *sk = chan->sk; 3338c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 3340a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 3350a708f8fSGustavo F. Padovan 336ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 3370a708f8fSGustavo F. Padovan 33849208c9cSGustavo F. Padovan BT_DBG("chan %p, conn %p, err %d", chan, conn, err); 3390a708f8fSGustavo F. Padovan 3400a708f8fSGustavo F. Padovan if (conn) { 341baa7e1faSGustavo F. Padovan /* Delete from channel list */ 342baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 343baa7e1faSGustavo F. Padovan list_del(&chan->list); 344baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 345baa7e1faSGustavo F. Padovan __sock_put(sk); 346baa7e1faSGustavo F. Padovan 3478c1d787bSGustavo F. Padovan chan->conn = NULL; 3480a708f8fSGustavo F. Padovan hci_conn_put(conn->hcon); 3490a708f8fSGustavo F. Padovan } 3500a708f8fSGustavo F. Padovan 3510a708f8fSGustavo F. Padovan sk->sk_state = BT_CLOSED; 3520a708f8fSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 3530a708f8fSGustavo F. Padovan 3540a708f8fSGustavo F. Padovan if (err) 3550a708f8fSGustavo F. Padovan sk->sk_err = err; 3560a708f8fSGustavo F. Padovan 3570a708f8fSGustavo F. Padovan if (parent) { 3580a708f8fSGustavo F. Padovan bt_accept_unlink(sk); 3590a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 3600a708f8fSGustavo F. Padovan } else 3610a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 3620a708f8fSGustavo F. Padovan 363b4450035SGustavo F. Padovan if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE && 364b4450035SGustavo F. Padovan chan->conf_state & L2CAP_CONF_INPUT_DONE)) 3656ff5abbfSGustavo F. Padovan return; 3662ead70b8SGustavo F. Padovan 36758d35f87SGustavo F. Padovan skb_queue_purge(&chan->tx_q); 3680a708f8fSGustavo F. Padovan 3690c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) { 3700a708f8fSGustavo F. Padovan struct srej_list *l, *tmp; 3710a708f8fSGustavo F. Padovan 372e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 373e92c8e70SGustavo F. Padovan del_timer(&chan->monitor_timer); 374e92c8e70SGustavo F. Padovan del_timer(&chan->ack_timer); 3750a708f8fSGustavo F. Padovan 376f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->srej_q); 377f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->busy_q); 3780a708f8fSGustavo F. Padovan 37939d5a3eeSGustavo F. Padovan list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { 3800a708f8fSGustavo F. Padovan list_del(&l->list); 3810a708f8fSGustavo F. Padovan kfree(l); 3820a708f8fSGustavo F. Padovan } 3830a708f8fSGustavo F. Padovan } 3840a708f8fSGustavo F. Padovan } 3850a708f8fSGustavo F. Padovan 3864519de9aSGustavo F. Padovan static void l2cap_chan_cleanup_listen(struct sock *parent) 3874519de9aSGustavo F. Padovan { 3884519de9aSGustavo F. Padovan struct sock *sk; 3894519de9aSGustavo F. Padovan 3904519de9aSGustavo F. Padovan BT_DBG("parent %p", parent); 3914519de9aSGustavo F. Padovan 3924519de9aSGustavo F. Padovan /* Close not yet accepted channels */ 3930f852724SGustavo F. Padovan while ((sk = bt_accept_dequeue(parent, NULL))) { 3940f852724SGustavo F. Padovan l2cap_chan_clear_timer(l2cap_pi(sk)->chan); 3950f852724SGustavo F. Padovan lock_sock(sk); 3960f852724SGustavo F. Padovan l2cap_chan_close(l2cap_pi(sk)->chan, ECONNRESET); 3970f852724SGustavo F. Padovan release_sock(sk); 3980f852724SGustavo F. Padovan l2cap_sock_kill(sk); 3990f852724SGustavo F. Padovan } 4004519de9aSGustavo F. Padovan 4014519de9aSGustavo F. Padovan parent->sk_state = BT_CLOSED; 4024519de9aSGustavo F. Padovan sock_set_flag(parent, SOCK_ZAPPED); 4034519de9aSGustavo F. Padovan } 4044519de9aSGustavo F. Padovan 4050f852724SGustavo F. Padovan void l2cap_chan_close(struct l2cap_chan *chan, int reason) 4064519de9aSGustavo F. Padovan { 4074519de9aSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 4084519de9aSGustavo F. Padovan struct sock *sk = chan->sk; 4094519de9aSGustavo F. Padovan 4104519de9aSGustavo F. Padovan BT_DBG("chan %p state %d socket %p", chan, sk->sk_state, sk->sk_socket); 4114519de9aSGustavo F. Padovan 4124519de9aSGustavo F. Padovan switch (sk->sk_state) { 4134519de9aSGustavo F. Padovan case BT_LISTEN: 4144519de9aSGustavo F. Padovan l2cap_chan_cleanup_listen(sk); 4154519de9aSGustavo F. Padovan break; 4164519de9aSGustavo F. Padovan 4174519de9aSGustavo F. Padovan case BT_CONNECTED: 4184519de9aSGustavo F. Padovan case BT_CONFIG: 419715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 4204519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 421500698d3SGustavo F. Padovan l2cap_chan_clear_timer(chan); 422ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, sk->sk_sndtimeo); 4234519de9aSGustavo F. Padovan l2cap_send_disconn_req(conn, chan, reason); 4244519de9aSGustavo F. Padovan } else 4254519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 4264519de9aSGustavo F. Padovan break; 4274519de9aSGustavo F. Padovan 4284519de9aSGustavo F. Padovan case BT_CONNECT2: 429715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 4304519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 4314519de9aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 4324519de9aSGustavo F. Padovan __u16 result; 4334519de9aSGustavo F. Padovan 4344519de9aSGustavo F. Padovan if (bt_sk(sk)->defer_setup) 4354519de9aSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 4364519de9aSGustavo F. Padovan else 4374519de9aSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 438d8d69c54SMat Martineau sk->sk_state = BT_DISCONN; 4394519de9aSGustavo F. Padovan 4404519de9aSGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 4414519de9aSGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 4424519de9aSGustavo F. Padovan rsp.result = cpu_to_le16(result); 4434519de9aSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 4444519de9aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 4454519de9aSGustavo F. Padovan sizeof(rsp), &rsp); 4464519de9aSGustavo F. Padovan } 4474519de9aSGustavo F. Padovan 4484519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 4494519de9aSGustavo F. Padovan break; 4504519de9aSGustavo F. Padovan 4514519de9aSGustavo F. Padovan case BT_CONNECT: 4524519de9aSGustavo F. Padovan case BT_DISCONN: 4534519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 4544519de9aSGustavo F. Padovan break; 4554519de9aSGustavo F. Padovan 4564519de9aSGustavo F. Padovan default: 4574519de9aSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 4584519de9aSGustavo F. Padovan break; 4594519de9aSGustavo F. Padovan } 4604519de9aSGustavo F. Padovan } 4614519de9aSGustavo F. Padovan 4624343478fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) 4630a708f8fSGustavo F. Padovan { 464715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_RAW) { 4654343478fSGustavo F. Padovan switch (chan->sec_level) { 4660a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 4670a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 4680a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 4690a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 4700a708f8fSGustavo F. Padovan default: 4710a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 4720a708f8fSGustavo F. Padovan } 473fe4128e0SGustavo F. Padovan } else if (chan->psm == cpu_to_le16(0x0001)) { 4744343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_LOW) 4754343478fSGustavo F. Padovan chan->sec_level = BT_SECURITY_SDP; 4760a708f8fSGustavo F. Padovan 4774343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_HIGH) 4780a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 4790a708f8fSGustavo F. Padovan else 4800a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 4810a708f8fSGustavo F. Padovan } else { 4824343478fSGustavo F. Padovan switch (chan->sec_level) { 4830a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 4840a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 4850a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 4860a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 4870a708f8fSGustavo F. Padovan default: 4880a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 4890a708f8fSGustavo F. Padovan } 4900a708f8fSGustavo F. Padovan } 4910a708f8fSGustavo F. Padovan } 4920a708f8fSGustavo F. Padovan 4930a708f8fSGustavo F. Padovan /* Service level security */ 4944343478fSGustavo F. Padovan static inline int l2cap_check_security(struct l2cap_chan *chan) 4950a708f8fSGustavo F. Padovan { 4968c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 4970a708f8fSGustavo F. Padovan __u8 auth_type; 4980a708f8fSGustavo F. Padovan 4994343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 5000a708f8fSGustavo F. Padovan 5014343478fSGustavo F. Padovan return hci_conn_security(conn->hcon, chan->sec_level, auth_type); 5020a708f8fSGustavo F. Padovan } 5030a708f8fSGustavo F. Padovan 504b5ad8b7fSJohannes Berg static u8 l2cap_get_ident(struct l2cap_conn *conn) 5050a708f8fSGustavo F. Padovan { 5060a708f8fSGustavo F. Padovan u8 id; 5070a708f8fSGustavo F. Padovan 5080a708f8fSGustavo F. Padovan /* Get next available identificator. 5090a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 5100a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 5110a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 5120a708f8fSGustavo F. Padovan */ 5130a708f8fSGustavo F. Padovan 5140a708f8fSGustavo F. Padovan spin_lock_bh(&conn->lock); 5150a708f8fSGustavo F. Padovan 5160a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 5170a708f8fSGustavo F. Padovan conn->tx_ident = 1; 5180a708f8fSGustavo F. Padovan 5190a708f8fSGustavo F. Padovan id = conn->tx_ident; 5200a708f8fSGustavo F. Padovan 5210a708f8fSGustavo F. Padovan spin_unlock_bh(&conn->lock); 5220a708f8fSGustavo F. Padovan 5230a708f8fSGustavo F. Padovan return id; 5240a708f8fSGustavo F. Padovan } 5250a708f8fSGustavo F. Padovan 5264519de9aSGustavo F. Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) 5270a708f8fSGustavo F. Padovan { 5280a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 5290a708f8fSGustavo F. Padovan u8 flags; 5300a708f8fSGustavo F. Padovan 5310a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 5320a708f8fSGustavo F. Padovan 5330a708f8fSGustavo F. Padovan if (!skb) 5340a708f8fSGustavo F. Padovan return; 5350a708f8fSGustavo F. Padovan 5360a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 5370a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 5380a708f8fSGustavo F. Padovan else 5390a708f8fSGustavo F. Padovan flags = ACL_START; 5400a708f8fSGustavo F. Padovan 54114b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; 54214b12d0bSJaikumar Ganesh 5430a708f8fSGustavo F. Padovan hci_send_acl(conn->hcon, skb, flags); 5440a708f8fSGustavo F. Padovan } 5450a708f8fSGustavo F. Padovan 546525cd185SGustavo F. Padovan static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) 5470a708f8fSGustavo F. Padovan { 5480a708f8fSGustavo F. Padovan struct sk_buff *skb; 5490a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 550525cd185SGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(chan->sk); 5518c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5520a708f8fSGustavo F. Padovan struct sock *sk = (struct sock *)pi; 5530a708f8fSGustavo F. Padovan int count, hlen = L2CAP_HDR_SIZE + 2; 5540a708f8fSGustavo F. Padovan u8 flags; 5550a708f8fSGustavo F. Padovan 5560a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 5570a708f8fSGustavo F. Padovan return; 5580a708f8fSGustavo F. Padovan 55947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 5600a708f8fSGustavo F. Padovan hlen += 2; 5610a708f8fSGustavo F. Padovan 56249208c9cSGustavo F. Padovan BT_DBG("chan %p, control 0x%2.2x", chan, control); 5630a708f8fSGustavo F. Padovan 5640a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, hlen); 5650a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FRAME_TYPE; 5660a708f8fSGustavo F. Padovan 567525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { 5680a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 569525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; 5700a708f8fSGustavo F. Padovan } 5710a708f8fSGustavo F. Padovan 572525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_PBIT) { 5730a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_POLL; 574525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_PBIT; 5750a708f8fSGustavo F. Padovan } 5760a708f8fSGustavo F. Padovan 5770a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 5780a708f8fSGustavo F. Padovan if (!skb) 5790a708f8fSGustavo F. Padovan return; 5800a708f8fSGustavo F. Padovan 5810a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 5820a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 583fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 5840a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 5850a708f8fSGustavo F. Padovan 58647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 5870a708f8fSGustavo F. Padovan u16 fcs = crc16(0, (u8 *)lh, count - 2); 5880a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb_put(skb, 2)); 5890a708f8fSGustavo F. Padovan } 5900a708f8fSGustavo F. Padovan 5910a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 5920a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 5930a708f8fSGustavo F. Padovan else 5940a708f8fSGustavo F. Padovan flags = ACL_START; 5950a708f8fSGustavo F. Padovan 59614b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = chan->force_active; 59714b12d0bSJaikumar Ganesh 5988c1d787bSGustavo F. Padovan hci_send_acl(chan->conn->hcon, skb, flags); 5990a708f8fSGustavo F. Padovan } 6000a708f8fSGustavo F. Padovan 601525cd185SGustavo F. Padovan static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) 6020a708f8fSGustavo F. Padovan { 603525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 6040a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 605525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 6060a708f8fSGustavo F. Padovan } else 6070a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 6080a708f8fSGustavo F. Padovan 60942e5c802SGustavo F. Padovan control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 6100a708f8fSGustavo F. Padovan 611525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 6120a708f8fSGustavo F. Padovan } 6130a708f8fSGustavo F. Padovan 614b4450035SGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) 6150a708f8fSGustavo F. Padovan { 616b4450035SGustavo F. Padovan return !(chan->conf_state & L2CAP_CONF_CONNECT_PEND); 6170a708f8fSGustavo F. Padovan } 6180a708f8fSGustavo F. Padovan 619fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 6200a708f8fSGustavo F. Padovan { 6218c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 6220a708f8fSGustavo F. Padovan 6230a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 6240a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 6250a708f8fSGustavo F. Padovan return; 6260a708f8fSGustavo F. Padovan 6274343478fSGustavo F. Padovan if (l2cap_check_security(chan) && 6284343478fSGustavo F. Padovan __l2cap_no_conn_pending(chan)) { 6290a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 630fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 631fe4128e0SGustavo F. Padovan req.psm = chan->psm; 6320a708f8fSGustavo F. Padovan 633fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 634b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_CONNECT_PEND; 6350a708f8fSGustavo F. Padovan 636fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 637fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 6380a708f8fSGustavo F. Padovan } 6390a708f8fSGustavo F. Padovan } else { 6400a708f8fSGustavo F. Padovan struct l2cap_info_req req; 6410a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 6420a708f8fSGustavo F. Padovan 6430a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 6440a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 6450a708f8fSGustavo F. Padovan 6460a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 6470a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 6480a708f8fSGustavo F. Padovan 6490a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 6500a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 6510a708f8fSGustavo F. Padovan } 6520a708f8fSGustavo F. Padovan } 6530a708f8fSGustavo F. Padovan 6540a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 6550a708f8fSGustavo F. Padovan { 6560a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 6570a708f8fSGustavo F. Padovan if (!disable_ertm) 6580a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 6590a708f8fSGustavo F. Padovan 6600a708f8fSGustavo F. Padovan switch (mode) { 6610a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 6620a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 6630a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 6640a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 6650a708f8fSGustavo F. Padovan default: 6660a708f8fSGustavo F. Padovan return 0x00; 6670a708f8fSGustavo F. Padovan } 6680a708f8fSGustavo F. Padovan } 6690a708f8fSGustavo F. Padovan 6704519de9aSGustavo F. Padovan static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) 6710a708f8fSGustavo F. Padovan { 672e92c8e70SGustavo F. Padovan struct sock *sk; 6730a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 6740a708f8fSGustavo F. Padovan 6750a708f8fSGustavo F. Padovan if (!conn) 6760a708f8fSGustavo F. Padovan return; 6770a708f8fSGustavo F. Padovan 678e92c8e70SGustavo F. Padovan sk = chan->sk; 679e92c8e70SGustavo F. Padovan 6800c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) { 681e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 682e92c8e70SGustavo F. Padovan del_timer(&chan->monitor_timer); 683e92c8e70SGustavo F. Padovan del_timer(&chan->ack_timer); 6840a708f8fSGustavo F. Padovan } 6850a708f8fSGustavo F. Padovan 686fe4128e0SGustavo F. Padovan req.dcid = cpu_to_le16(chan->dcid); 687fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 6880a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 6890a708f8fSGustavo F. Padovan L2CAP_DISCONN_REQ, sizeof(req), &req); 6900a708f8fSGustavo F. Padovan 6910a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 6920a708f8fSGustavo F. Padovan sk->sk_err = err; 6930a708f8fSGustavo F. Padovan } 6940a708f8fSGustavo F. Padovan 6950a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 6960a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 6970a708f8fSGustavo F. Padovan { 698820ffdb3SGustavo F. Padovan struct l2cap_chan *chan, *tmp; 6990a708f8fSGustavo F. Padovan 7000a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 7010a708f8fSGustavo F. Padovan 702baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 7030a708f8fSGustavo F. Padovan 704820ffdb3SGustavo F. Padovan list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 70548454079SGustavo F. Padovan struct sock *sk = chan->sk; 706baa7e1faSGustavo F. Padovan 7070a708f8fSGustavo F. Padovan bh_lock_sock(sk); 7080a708f8fSGustavo F. Padovan 709715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 7100a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7110a708f8fSGustavo F. Padovan continue; 7120a708f8fSGustavo F. Padovan } 7130a708f8fSGustavo F. Padovan 7140a708f8fSGustavo F. Padovan if (sk->sk_state == BT_CONNECT) { 7150a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 7160a708f8fSGustavo F. Padovan 7174343478fSGustavo F. Padovan if (!l2cap_check_security(chan) || 718b4450035SGustavo F. Padovan !__l2cap_no_conn_pending(chan)) { 7190a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7200a708f8fSGustavo F. Padovan continue; 7210a708f8fSGustavo F. Padovan } 7220a708f8fSGustavo F. Padovan 7230c1bc5c6SGustavo F. Padovan if (!l2cap_mode_supported(chan->mode, 7240a708f8fSGustavo F. Padovan conn->feat_mask) 725b4450035SGustavo F. Padovan && chan->conf_state & 7260a708f8fSGustavo F. Padovan L2CAP_CONF_STATE2_DEVICE) { 7270f852724SGustavo F. Padovan /* l2cap_chan_close() calls list_del(chan) 728820ffdb3SGustavo F. Padovan * so release the lock */ 729820ffdb3SGustavo F. Padovan read_unlock_bh(&conn->chan_lock); 7300f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNRESET); 731820ffdb3SGustavo F. Padovan read_lock_bh(&conn->chan_lock); 7320a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7330a708f8fSGustavo F. Padovan continue; 7340a708f8fSGustavo F. Padovan } 7350a708f8fSGustavo F. Padovan 736fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 737fe4128e0SGustavo F. Padovan req.psm = chan->psm; 7380a708f8fSGustavo F. Padovan 739fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 740b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_CONNECT_PEND; 7410a708f8fSGustavo F. Padovan 742fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 743fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 7440a708f8fSGustavo F. Padovan 7450a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT2) { 7460a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 7470a708f8fSGustavo F. Padovan char buf[128]; 748fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 749fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 7500a708f8fSGustavo F. Padovan 7514343478fSGustavo F. Padovan if (l2cap_check_security(chan)) { 7520a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 7530a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 7540a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 7550a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 7560a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 7570a708f8fSGustavo F. Padovan 7580a708f8fSGustavo F. Padovan } else { 7590a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 7600a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 7610a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 7620a708f8fSGustavo F. Padovan } 7630a708f8fSGustavo F. Padovan } else { 7640a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 7650a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 7660a708f8fSGustavo F. Padovan } 7670a708f8fSGustavo F. Padovan 768fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 769fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 7700a708f8fSGustavo F. Padovan 771b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_REQ_SENT || 7720a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 7730a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7740a708f8fSGustavo F. Padovan continue; 7750a708f8fSGustavo F. Padovan } 7760a708f8fSGustavo F. Padovan 777b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 7780a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 77973ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 78073ffa904SGustavo F. Padovan chan->num_conf_req++; 7810a708f8fSGustavo F. Padovan } 7820a708f8fSGustavo F. Padovan 7830a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7840a708f8fSGustavo F. Padovan } 7850a708f8fSGustavo F. Padovan 786baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 7870a708f8fSGustavo F. Padovan } 7880a708f8fSGustavo F. Padovan 789b62f328bSVille Tervo /* Find socket with cid and source bdaddr. 790b62f328bSVille Tervo * Returns closest match, locked. 791b62f328bSVille Tervo */ 79223691d75SGustavo F. Padovan static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) 793b62f328bSVille Tervo { 79423691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 795b62f328bSVille Tervo 79623691d75SGustavo F. Padovan read_lock(&chan_list_lock); 797b62f328bSVille Tervo 79823691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 79923691d75SGustavo F. Padovan struct sock *sk = c->sk; 800fe4128e0SGustavo F. Padovan 801b62f328bSVille Tervo if (state && sk->sk_state != state) 802b62f328bSVille Tervo continue; 803b62f328bSVille Tervo 80423691d75SGustavo F. Padovan if (c->scid == cid) { 805b62f328bSVille Tervo /* Exact match. */ 80623691d75SGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, src)) { 80723691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 80823691d75SGustavo F. Padovan return c; 80923691d75SGustavo F. Padovan } 810b62f328bSVille Tervo 811b62f328bSVille Tervo /* Closest match */ 812b62f328bSVille Tervo if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 81323691d75SGustavo F. Padovan c1 = c; 814b62f328bSVille Tervo } 815b62f328bSVille Tervo } 816280f294fSGustavo F. Padovan 81723691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 818b62f328bSVille Tervo 81923691d75SGustavo F. Padovan return c1; 820b62f328bSVille Tervo } 821b62f328bSVille Tervo 822b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 823b62f328bSVille Tervo { 824c916fbe4SGustavo F. Padovan struct sock *parent, *sk; 82523691d75SGustavo F. Padovan struct l2cap_chan *chan, *pchan; 826b62f328bSVille Tervo 827b62f328bSVille Tervo BT_DBG(""); 828b62f328bSVille Tervo 829b62f328bSVille Tervo /* Check if we have socket listening on cid */ 83023691d75SGustavo F. Padovan pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, 831b62f328bSVille Tervo conn->src); 83223691d75SGustavo F. Padovan if (!pchan) 833b62f328bSVille Tervo return; 834b62f328bSVille Tervo 83523691d75SGustavo F. Padovan parent = pchan->sk; 83623691d75SGustavo F. Padovan 83762f3a2cfSGustavo F. Padovan bh_lock_sock(parent); 83862f3a2cfSGustavo F. Padovan 839b62f328bSVille Tervo /* Check for backlog size */ 840b62f328bSVille Tervo if (sk_acceptq_is_full(parent)) { 841b62f328bSVille Tervo BT_DBG("backlog full %d", parent->sk_ack_backlog); 842b62f328bSVille Tervo goto clean; 843b62f328bSVille Tervo } 844b62f328bSVille Tervo 84580808e43SGustavo F. Padovan chan = pchan->ops->new_connection(pchan->data); 84680808e43SGustavo F. Padovan if (!chan) 847b62f328bSVille Tervo goto clean; 848b62f328bSVille Tervo 84980808e43SGustavo F. Padovan sk = chan->sk; 8505d41ce1dSGustavo F. Padovan 851baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 852b62f328bSVille Tervo 853b62f328bSVille Tervo hci_conn_hold(conn->hcon); 854b62f328bSVille Tervo 855b62f328bSVille Tervo bacpy(&bt_sk(sk)->src, conn->src); 856b62f328bSVille Tervo bacpy(&bt_sk(sk)->dst, conn->dst); 857b62f328bSVille Tervo 858d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 859d1010240SGustavo F. Padovan 86048454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 86148454079SGustavo F. Padovan 862ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, sk->sk_sndtimeo); 863b62f328bSVille Tervo 864b62f328bSVille Tervo sk->sk_state = BT_CONNECTED; 865b62f328bSVille Tervo parent->sk_data_ready(parent, 0); 866b62f328bSVille Tervo 867baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 868b62f328bSVille Tervo 869b62f328bSVille Tervo clean: 870b62f328bSVille Tervo bh_unlock_sock(parent); 871b62f328bSVille Tervo } 872b62f328bSVille Tervo 8730a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 8740a708f8fSGustavo F. Padovan { 87548454079SGustavo F. Padovan struct l2cap_chan *chan; 8760a708f8fSGustavo F. Padovan 8770a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 8780a708f8fSGustavo F. Padovan 879b62f328bSVille Tervo if (!conn->hcon->out && conn->hcon->type == LE_LINK) 880b62f328bSVille Tervo l2cap_le_conn_ready(conn); 881b62f328bSVille Tervo 882baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 8830a708f8fSGustavo F. Padovan 884baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 88548454079SGustavo F. Padovan struct sock *sk = chan->sk; 886baa7e1faSGustavo F. Padovan 8870a708f8fSGustavo F. Padovan bh_lock_sock(sk); 8880a708f8fSGustavo F. Padovan 889acd7d370SVille Tervo if (conn->hcon->type == LE_LINK) { 890ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 891acd7d370SVille Tervo sk->sk_state = BT_CONNECTED; 892acd7d370SVille Tervo sk->sk_state_change(sk); 893acd7d370SVille Tervo } 894acd7d370SVille Tervo 895715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 896ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 8970a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 8980a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 8990a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT) 900fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 9010a708f8fSGustavo F. Padovan 9020a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9030a708f8fSGustavo F. Padovan } 9040a708f8fSGustavo F. Padovan 905baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 9060a708f8fSGustavo F. Padovan } 9070a708f8fSGustavo F. Padovan 9080a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 9090a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 9100a708f8fSGustavo F. Padovan { 91148454079SGustavo F. Padovan struct l2cap_chan *chan; 9120a708f8fSGustavo F. Padovan 9130a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 9140a708f8fSGustavo F. Padovan 915baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 9160a708f8fSGustavo F. Padovan 917baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 91848454079SGustavo F. Padovan struct sock *sk = chan->sk; 919baa7e1faSGustavo F. Padovan 9204343478fSGustavo F. Padovan if (chan->force_reliable) 9210a708f8fSGustavo F. Padovan sk->sk_err = err; 9220a708f8fSGustavo F. Padovan } 9230a708f8fSGustavo F. Padovan 924baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 9250a708f8fSGustavo F. Padovan } 9260a708f8fSGustavo F. Padovan 9270a708f8fSGustavo F. Padovan static void l2cap_info_timeout(unsigned long arg) 9280a708f8fSGustavo F. Padovan { 9290a708f8fSGustavo F. Padovan struct l2cap_conn *conn = (void *) arg; 9300a708f8fSGustavo F. Padovan 9310a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 9320a708f8fSGustavo F. Padovan conn->info_ident = 0; 9330a708f8fSGustavo F. Padovan 9340a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 9350a708f8fSGustavo F. Padovan } 9360a708f8fSGustavo F. Padovan 9370a708f8fSGustavo F. Padovan static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) 9380a708f8fSGustavo F. Padovan { 9390a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 9400a708f8fSGustavo F. Padovan 9410a708f8fSGustavo F. Padovan if (conn || status) 9420a708f8fSGustavo F. Padovan return conn; 9430a708f8fSGustavo F. Padovan 9440a708f8fSGustavo F. Padovan conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); 9450a708f8fSGustavo F. Padovan if (!conn) 9460a708f8fSGustavo F. Padovan return NULL; 9470a708f8fSGustavo F. Padovan 9480a708f8fSGustavo F. Padovan hcon->l2cap_data = conn; 9490a708f8fSGustavo F. Padovan conn->hcon = hcon; 9500a708f8fSGustavo F. Padovan 9510a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p", hcon, conn); 9520a708f8fSGustavo F. Padovan 953acd7d370SVille Tervo if (hcon->hdev->le_mtu && hcon->type == LE_LINK) 954acd7d370SVille Tervo conn->mtu = hcon->hdev->le_mtu; 955acd7d370SVille Tervo else 9560a708f8fSGustavo F. Padovan conn->mtu = hcon->hdev->acl_mtu; 957acd7d370SVille Tervo 9580a708f8fSGustavo F. Padovan conn->src = &hcon->hdev->bdaddr; 9590a708f8fSGustavo F. Padovan conn->dst = &hcon->dst; 9600a708f8fSGustavo F. Padovan 9610a708f8fSGustavo F. Padovan conn->feat_mask = 0; 9620a708f8fSGustavo F. Padovan 9630a708f8fSGustavo F. Padovan spin_lock_init(&conn->lock); 964baa7e1faSGustavo F. Padovan rwlock_init(&conn->chan_lock); 965baa7e1faSGustavo F. Padovan 966baa7e1faSGustavo F. Padovan INIT_LIST_HEAD(&conn->chan_l); 9670a708f8fSGustavo F. Padovan 968b62f328bSVille Tervo if (hcon->type != LE_LINK) 9690a708f8fSGustavo F. Padovan setup_timer(&conn->info_timer, l2cap_info_timeout, 9700a708f8fSGustavo F. Padovan (unsigned long) conn); 9710a708f8fSGustavo F. Padovan 9720a708f8fSGustavo F. Padovan conn->disc_reason = 0x13; 9730a708f8fSGustavo F. Padovan 9740a708f8fSGustavo F. Padovan return conn; 9750a708f8fSGustavo F. Padovan } 9760a708f8fSGustavo F. Padovan 9770a708f8fSGustavo F. Padovan static void l2cap_conn_del(struct hci_conn *hcon, int err) 9780a708f8fSGustavo F. Padovan { 9790a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 980baa7e1faSGustavo F. Padovan struct l2cap_chan *chan, *l; 9810a708f8fSGustavo F. Padovan struct sock *sk; 9820a708f8fSGustavo F. Padovan 9830a708f8fSGustavo F. Padovan if (!conn) 9840a708f8fSGustavo F. Padovan return; 9850a708f8fSGustavo F. Padovan 9860a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 9870a708f8fSGustavo F. Padovan 9880a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 9890a708f8fSGustavo F. Padovan 9900a708f8fSGustavo F. Padovan /* Kill channels */ 991baa7e1faSGustavo F. Padovan list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 99248454079SGustavo F. Padovan sk = chan->sk; 9930a708f8fSGustavo F. Padovan bh_lock_sock(sk); 99448454079SGustavo F. Padovan l2cap_chan_del(chan, err); 9950a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9960a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 9970a708f8fSGustavo F. Padovan } 9980a708f8fSGustavo F. Padovan 9990a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 10000a708f8fSGustavo F. Padovan del_timer_sync(&conn->info_timer); 10010a708f8fSGustavo F. Padovan 10020a708f8fSGustavo F. Padovan hcon->l2cap_data = NULL; 10030a708f8fSGustavo F. Padovan kfree(conn); 10040a708f8fSGustavo F. Padovan } 10050a708f8fSGustavo F. Padovan 100648454079SGustavo F. Padovan static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 10070a708f8fSGustavo F. Padovan { 1008baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 100948454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 1010baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 10110a708f8fSGustavo F. Padovan } 10120a708f8fSGustavo F. Padovan 10130a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 10140a708f8fSGustavo F. Padovan 10150a708f8fSGustavo F. Padovan /* Find socket with psm and source bdaddr. 10160a708f8fSGustavo F. Padovan * Returns closest match. 10170a708f8fSGustavo F. Padovan */ 101823691d75SGustavo F. Padovan static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) 10190a708f8fSGustavo F. Padovan { 102023691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 10210a708f8fSGustavo F. Padovan 102223691d75SGustavo F. Padovan read_lock(&chan_list_lock); 10230a708f8fSGustavo F. Padovan 102423691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 102523691d75SGustavo F. Padovan struct sock *sk = c->sk; 1026fe4128e0SGustavo F. Padovan 10270a708f8fSGustavo F. Padovan if (state && sk->sk_state != state) 10280a708f8fSGustavo F. Padovan continue; 10290a708f8fSGustavo F. Padovan 103023691d75SGustavo F. Padovan if (c->psm == psm) { 10310a708f8fSGustavo F. Padovan /* Exact match. */ 103223691d75SGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, src)) { 1033a7567b20SJohannes Berg read_unlock(&chan_list_lock); 103423691d75SGustavo F. Padovan return c; 103523691d75SGustavo F. Padovan } 10360a708f8fSGustavo F. Padovan 10370a708f8fSGustavo F. Padovan /* Closest match */ 10380a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 103923691d75SGustavo F. Padovan c1 = c; 10400a708f8fSGustavo F. Padovan } 10410a708f8fSGustavo F. Padovan } 10420a708f8fSGustavo F. Padovan 104323691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 10440a708f8fSGustavo F. Padovan 104523691d75SGustavo F. Padovan return c1; 10460a708f8fSGustavo F. Padovan } 10470a708f8fSGustavo F. Padovan 104877a74c7eSGustavo F. Padovan int l2cap_chan_connect(struct l2cap_chan *chan) 10490a708f8fSGustavo F. Padovan { 10505d41ce1dSGustavo F. Padovan struct sock *sk = chan->sk; 10510a708f8fSGustavo F. Padovan bdaddr_t *src = &bt_sk(sk)->src; 10520a708f8fSGustavo F. Padovan bdaddr_t *dst = &bt_sk(sk)->dst; 10530a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 10540a708f8fSGustavo F. Padovan struct hci_conn *hcon; 10550a708f8fSGustavo F. Padovan struct hci_dev *hdev; 10560a708f8fSGustavo F. Padovan __u8 auth_type; 10570a708f8fSGustavo F. Padovan int err; 10580a708f8fSGustavo F. Padovan 10590a708f8fSGustavo F. Padovan BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), 1060fe4128e0SGustavo F. Padovan chan->psm); 10610a708f8fSGustavo F. Padovan 10620a708f8fSGustavo F. Padovan hdev = hci_get_route(dst, src); 10630a708f8fSGustavo F. Padovan if (!hdev) 10640a708f8fSGustavo F. Padovan return -EHOSTUNREACH; 10650a708f8fSGustavo F. Padovan 10660a708f8fSGustavo F. Padovan hci_dev_lock_bh(hdev); 10670a708f8fSGustavo F. Padovan 10684343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 10690a708f8fSGustavo F. Padovan 1070fe4128e0SGustavo F. Padovan if (chan->dcid == L2CAP_CID_LE_DATA) 1071acd7d370SVille Tervo hcon = hci_connect(hdev, LE_LINK, dst, 10724343478fSGustavo F. Padovan chan->sec_level, auth_type); 1073acd7d370SVille Tervo else 10740a708f8fSGustavo F. Padovan hcon = hci_connect(hdev, ACL_LINK, dst, 10754343478fSGustavo F. Padovan chan->sec_level, auth_type); 1076acd7d370SVille Tervo 107730e76272SVille Tervo if (IS_ERR(hcon)) { 107830e76272SVille Tervo err = PTR_ERR(hcon); 10790a708f8fSGustavo F. Padovan goto done; 108030e76272SVille Tervo } 10810a708f8fSGustavo F. Padovan 10820a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 10830a708f8fSGustavo F. Padovan if (!conn) { 10840a708f8fSGustavo F. Padovan hci_conn_put(hcon); 108530e76272SVille Tervo err = -ENOMEM; 10860a708f8fSGustavo F. Padovan goto done; 10870a708f8fSGustavo F. Padovan } 10880a708f8fSGustavo F. Padovan 10890a708f8fSGustavo F. Padovan /* Update source addr of the socket */ 10900a708f8fSGustavo F. Padovan bacpy(src, conn->src); 10910a708f8fSGustavo F. Padovan 109248454079SGustavo F. Padovan l2cap_chan_add(conn, chan); 109348454079SGustavo F. Padovan 10940a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT; 1095ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, sk->sk_sndtimeo); 10960a708f8fSGustavo F. Padovan 10970a708f8fSGustavo F. Padovan if (hcon->state == BT_CONNECTED) { 1098715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 1099ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 11004343478fSGustavo F. Padovan if (l2cap_check_security(chan)) 11010a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 11020a708f8fSGustavo F. Padovan } else 1103fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 11040a708f8fSGustavo F. Padovan } 11050a708f8fSGustavo F. Padovan 110630e76272SVille Tervo err = 0; 110730e76272SVille Tervo 11080a708f8fSGustavo F. Padovan done: 11090a708f8fSGustavo F. Padovan hci_dev_unlock_bh(hdev); 11100a708f8fSGustavo F. Padovan hci_dev_put(hdev); 11110a708f8fSGustavo F. Padovan return err; 11120a708f8fSGustavo F. Padovan } 11130a708f8fSGustavo F. Padovan 1114dcba0dbaSGustavo F. Padovan int __l2cap_wait_ack(struct sock *sk) 11150a708f8fSGustavo F. Padovan { 11168c1d787bSGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 11170a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 11180a708f8fSGustavo F. Padovan int err = 0; 11190a708f8fSGustavo F. Padovan int timeo = HZ/5; 11200a708f8fSGustavo F. Padovan 11210a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 11228c1d787bSGustavo F. Padovan while ((chan->unacked_frames > 0 && chan->conn)) { 11230a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 11240a708f8fSGustavo F. Padovan 11250a708f8fSGustavo F. Padovan if (!timeo) 11260a708f8fSGustavo F. Padovan timeo = HZ/5; 11270a708f8fSGustavo F. Padovan 11280a708f8fSGustavo F. Padovan if (signal_pending(current)) { 11290a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 11300a708f8fSGustavo F. Padovan break; 11310a708f8fSGustavo F. Padovan } 11320a708f8fSGustavo F. Padovan 11330a708f8fSGustavo F. Padovan release_sock(sk); 11340a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 11350a708f8fSGustavo F. Padovan lock_sock(sk); 11360a708f8fSGustavo F. Padovan 11370a708f8fSGustavo F. Padovan err = sock_error(sk); 11380a708f8fSGustavo F. Padovan if (err) 11390a708f8fSGustavo F. Padovan break; 11400a708f8fSGustavo F. Padovan } 11410a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 11420a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 11430a708f8fSGustavo F. Padovan return err; 11440a708f8fSGustavo F. Padovan } 11450a708f8fSGustavo F. Padovan 11460a708f8fSGustavo F. Padovan static void l2cap_monitor_timeout(unsigned long arg) 11470a708f8fSGustavo F. Padovan { 1148525cd185SGustavo F. Padovan struct l2cap_chan *chan = (void *) arg; 1149525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 11500a708f8fSGustavo F. Padovan 1151525cd185SGustavo F. Padovan BT_DBG("chan %p", chan); 11520a708f8fSGustavo F. Padovan 11530a708f8fSGustavo F. Padovan bh_lock_sock(sk); 11542c03a7a4SGustavo F. Padovan if (chan->retry_count >= chan->remote_max_tx) { 11558c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); 11560a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 11570a708f8fSGustavo F. Padovan return; 11580a708f8fSGustavo F. Padovan } 11590a708f8fSGustavo F. Padovan 11606a026610SGustavo F. Padovan chan->retry_count++; 11610a708f8fSGustavo F. Padovan __mod_monitor_timer(); 11620a708f8fSGustavo F. Padovan 1163525cd185SGustavo F. Padovan l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); 11640a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 11650a708f8fSGustavo F. Padovan } 11660a708f8fSGustavo F. Padovan 11670a708f8fSGustavo F. Padovan static void l2cap_retrans_timeout(unsigned long arg) 11680a708f8fSGustavo F. Padovan { 1169525cd185SGustavo F. Padovan struct l2cap_chan *chan = (void *) arg; 1170525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 11710a708f8fSGustavo F. Padovan 117249208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 11730a708f8fSGustavo F. Padovan 11740a708f8fSGustavo F. Padovan bh_lock_sock(sk); 11756a026610SGustavo F. Padovan chan->retry_count = 1; 11760a708f8fSGustavo F. Padovan __mod_monitor_timer(); 11770a708f8fSGustavo F. Padovan 1178525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_WAIT_F; 11790a708f8fSGustavo F. Padovan 1180525cd185SGustavo F. Padovan l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); 11810a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 11820a708f8fSGustavo F. Padovan } 11830a708f8fSGustavo F. Padovan 118442e5c802SGustavo F. Padovan static void l2cap_drop_acked_frames(struct l2cap_chan *chan) 11850a708f8fSGustavo F. Padovan { 11860a708f8fSGustavo F. Padovan struct sk_buff *skb; 11870a708f8fSGustavo F. Padovan 118858d35f87SGustavo F. Padovan while ((skb = skb_peek(&chan->tx_q)) && 11896a026610SGustavo F. Padovan chan->unacked_frames) { 119042e5c802SGustavo F. Padovan if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) 11910a708f8fSGustavo F. Padovan break; 11920a708f8fSGustavo F. Padovan 119358d35f87SGustavo F. Padovan skb = skb_dequeue(&chan->tx_q); 11940a708f8fSGustavo F. Padovan kfree_skb(skb); 11950a708f8fSGustavo F. Padovan 11966a026610SGustavo F. Padovan chan->unacked_frames--; 11970a708f8fSGustavo F. Padovan } 11980a708f8fSGustavo F. Padovan 11996a026610SGustavo F. Padovan if (!chan->unacked_frames) 1200e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 12010a708f8fSGustavo F. Padovan } 12020a708f8fSGustavo F. Padovan 12034343478fSGustavo F. Padovan void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) 12040a708f8fSGustavo F. Padovan { 12058c1d787bSGustavo F. Padovan struct hci_conn *hcon = chan->conn->hcon; 12060a708f8fSGustavo F. Padovan u16 flags; 12070a708f8fSGustavo F. Padovan 12084343478fSGustavo F. Padovan BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len); 12090a708f8fSGustavo F. Padovan 12104343478fSGustavo F. Padovan if (!chan->flushable && lmp_no_flush_capable(hcon->hdev)) 12110a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 12120a708f8fSGustavo F. Padovan else 12130a708f8fSGustavo F. Padovan flags = ACL_START; 12140a708f8fSGustavo F. Padovan 121514b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = chan->force_active; 12160a708f8fSGustavo F. Padovan hci_send_acl(hcon, skb, flags); 12170a708f8fSGustavo F. Padovan } 12180a708f8fSGustavo F. Padovan 121942e5c802SGustavo F. Padovan void l2cap_streaming_send(struct l2cap_chan *chan) 12200a708f8fSGustavo F. Padovan { 12210a708f8fSGustavo F. Padovan struct sk_buff *skb; 12220a708f8fSGustavo F. Padovan u16 control, fcs; 12230a708f8fSGustavo F. Padovan 122458d35f87SGustavo F. Padovan while ((skb = skb_dequeue(&chan->tx_q))) { 12250a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); 122642e5c802SGustavo F. Padovan control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; 12270a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); 12280a708f8fSGustavo F. Padovan 122947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 12300a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, skb->len - 2); 12310a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + skb->len - 2); 12320a708f8fSGustavo F. Padovan } 12330a708f8fSGustavo F. Padovan 12344343478fSGustavo F. Padovan l2cap_do_send(chan, skb); 12350a708f8fSGustavo F. Padovan 123642e5c802SGustavo F. Padovan chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; 12370a708f8fSGustavo F. Padovan } 12380a708f8fSGustavo F. Padovan } 12390a708f8fSGustavo F. Padovan 1240525cd185SGustavo F. Padovan static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) 12410a708f8fSGustavo F. Padovan { 12420a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 12430a708f8fSGustavo F. Padovan u16 control, fcs; 12440a708f8fSGustavo F. Padovan 124558d35f87SGustavo F. Padovan skb = skb_peek(&chan->tx_q); 12460a708f8fSGustavo F. Padovan if (!skb) 12470a708f8fSGustavo F. Padovan return; 12480a708f8fSGustavo F. Padovan 12490a708f8fSGustavo F. Padovan do { 12500a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq == tx_seq) 12510a708f8fSGustavo F. Padovan break; 12520a708f8fSGustavo F. Padovan 125358d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 12540a708f8fSGustavo F. Padovan return; 12550a708f8fSGustavo F. Padovan 125658d35f87SGustavo F. Padovan } while ((skb = skb_queue_next(&chan->tx_q, skb))); 12570a708f8fSGustavo F. Padovan 12582c03a7a4SGustavo F. Padovan if (chan->remote_max_tx && 12592c03a7a4SGustavo F. Padovan bt_cb(skb)->retries == chan->remote_max_tx) { 12608c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); 12610a708f8fSGustavo F. Padovan return; 12620a708f8fSGustavo F. Padovan } 12630a708f8fSGustavo F. Padovan 12640a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 12650a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 12660a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 1267a429b519SRuiyi Zhang control &= L2CAP_CTRL_SAR; 12680a708f8fSGustavo F. Padovan 1269525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { 12700a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 1271525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; 12720a708f8fSGustavo F. Padovan } 12730a708f8fSGustavo F. Padovan 127442e5c802SGustavo F. Padovan control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 12750a708f8fSGustavo F. Padovan | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 12760a708f8fSGustavo F. Padovan 12770a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 12780a708f8fSGustavo F. Padovan 127947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 12800a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); 12810a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); 12820a708f8fSGustavo F. Padovan } 12830a708f8fSGustavo F. Padovan 12844343478fSGustavo F. Padovan l2cap_do_send(chan, tx_skb); 12850a708f8fSGustavo F. Padovan } 12860a708f8fSGustavo F. Padovan 1287525cd185SGustavo F. Padovan int l2cap_ertm_send(struct l2cap_chan *chan) 12880a708f8fSGustavo F. Padovan { 12890a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 1290525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 12910a708f8fSGustavo F. Padovan u16 control, fcs; 12920a708f8fSGustavo F. Padovan int nsent = 0; 12930a708f8fSGustavo F. Padovan 12940a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 12950a708f8fSGustavo F. Padovan return -ENOTCONN; 12960a708f8fSGustavo F. Padovan 129758d35f87SGustavo F. Padovan while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { 12980a708f8fSGustavo F. Padovan 12992c03a7a4SGustavo F. Padovan if (chan->remote_max_tx && 13002c03a7a4SGustavo F. Padovan bt_cb(skb)->retries == chan->remote_max_tx) { 13018c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); 13020a708f8fSGustavo F. Padovan break; 13030a708f8fSGustavo F. Padovan } 13040a708f8fSGustavo F. Padovan 13050a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 13060a708f8fSGustavo F. Padovan 13070a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 13080a708f8fSGustavo F. Padovan 13090a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 13100a708f8fSGustavo F. Padovan control &= L2CAP_CTRL_SAR; 13110a708f8fSGustavo F. Padovan 1312525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { 13130a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 1314525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; 13150a708f8fSGustavo F. Padovan } 131642e5c802SGustavo F. Padovan control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 131742e5c802SGustavo F. Padovan | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 13180a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 13190a708f8fSGustavo F. Padovan 13200a708f8fSGustavo F. Padovan 132147d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 13220a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); 13230a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); 13240a708f8fSGustavo F. Padovan } 13250a708f8fSGustavo F. Padovan 13264343478fSGustavo F. Padovan l2cap_do_send(chan, tx_skb); 13270a708f8fSGustavo F. Padovan 13280a708f8fSGustavo F. Padovan __mod_retrans_timer(); 13290a708f8fSGustavo F. Padovan 133042e5c802SGustavo F. Padovan bt_cb(skb)->tx_seq = chan->next_tx_seq; 133142e5c802SGustavo F. Padovan chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; 13320a708f8fSGustavo F. Padovan 133323e9fde2SSuraj Sumangala if (bt_cb(skb)->retries == 1) 13346a026610SGustavo F. Padovan chan->unacked_frames++; 133523e9fde2SSuraj Sumangala 13366a026610SGustavo F. Padovan chan->frames_sent++; 13370a708f8fSGustavo F. Padovan 133858d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 133958d35f87SGustavo F. Padovan chan->tx_send_head = NULL; 13400a708f8fSGustavo F. Padovan else 134158d35f87SGustavo F. Padovan chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); 13420a708f8fSGustavo F. Padovan 13430a708f8fSGustavo F. Padovan nsent++; 13440a708f8fSGustavo F. Padovan } 13450a708f8fSGustavo F. Padovan 13460a708f8fSGustavo F. Padovan return nsent; 13470a708f8fSGustavo F. Padovan } 13480a708f8fSGustavo F. Padovan 1349525cd185SGustavo F. Padovan static int l2cap_retransmit_frames(struct l2cap_chan *chan) 13500a708f8fSGustavo F. Padovan { 13510a708f8fSGustavo F. Padovan int ret; 13520a708f8fSGustavo F. Padovan 135358d35f87SGustavo F. Padovan if (!skb_queue_empty(&chan->tx_q)) 135458d35f87SGustavo F. Padovan chan->tx_send_head = chan->tx_q.next; 13550a708f8fSGustavo F. Padovan 135642e5c802SGustavo F. Padovan chan->next_tx_seq = chan->expected_ack_seq; 1357525cd185SGustavo F. Padovan ret = l2cap_ertm_send(chan); 13580a708f8fSGustavo F. Padovan return ret; 13590a708f8fSGustavo F. Padovan } 13600a708f8fSGustavo F. Padovan 1361525cd185SGustavo F. Padovan static void l2cap_send_ack(struct l2cap_chan *chan) 13620a708f8fSGustavo F. Padovan { 13630a708f8fSGustavo F. Padovan u16 control = 0; 13640a708f8fSGustavo F. Padovan 136542e5c802SGustavo F. Padovan control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 13660a708f8fSGustavo F. Padovan 1367525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 13680a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 1369525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 1370525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 13710a708f8fSGustavo F. Padovan return; 13720a708f8fSGustavo F. Padovan } 13730a708f8fSGustavo F. Padovan 1374525cd185SGustavo F. Padovan if (l2cap_ertm_send(chan) > 0) 13750a708f8fSGustavo F. Padovan return; 13760a708f8fSGustavo F. Padovan 13770a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 1378525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 13790a708f8fSGustavo F. Padovan } 13800a708f8fSGustavo F. Padovan 1381525cd185SGustavo F. Padovan static void l2cap_send_srejtail(struct l2cap_chan *chan) 13820a708f8fSGustavo F. Padovan { 13830a708f8fSGustavo F. Padovan struct srej_list *tail; 13840a708f8fSGustavo F. Padovan u16 control; 13850a708f8fSGustavo F. Padovan 13860a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 13870a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 13880a708f8fSGustavo F. Padovan 138939d5a3eeSGustavo F. Padovan tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); 13900a708f8fSGustavo F. Padovan control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 13910a708f8fSGustavo F. Padovan 1392525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 13930a708f8fSGustavo F. Padovan } 13940a708f8fSGustavo F. Padovan 13950a708f8fSGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) 13960a708f8fSGustavo F. Padovan { 13978c1d787bSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; 13980a708f8fSGustavo F. Padovan struct sk_buff **frag; 13990a708f8fSGustavo F. Padovan int err, sent = 0; 14000a708f8fSGustavo F. Padovan 14010a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) 14020a708f8fSGustavo F. Padovan return -EFAULT; 14030a708f8fSGustavo F. Padovan 14040a708f8fSGustavo F. Padovan sent += count; 14050a708f8fSGustavo F. Padovan len -= count; 14060a708f8fSGustavo F. Padovan 14070a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 14080a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 14090a708f8fSGustavo F. Padovan while (len) { 14100a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 14110a708f8fSGustavo F. Padovan 14120a708f8fSGustavo F. Padovan *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); 14130a708f8fSGustavo F. Padovan if (!*frag) 14140a708f8fSGustavo F. Padovan return err; 14150a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) 14160a708f8fSGustavo F. Padovan return -EFAULT; 14170a708f8fSGustavo F. Padovan 14180a708f8fSGustavo F. Padovan sent += count; 14190a708f8fSGustavo F. Padovan len -= count; 14200a708f8fSGustavo F. Padovan 14210a708f8fSGustavo F. Padovan frag = &(*frag)->next; 14220a708f8fSGustavo F. Padovan } 14230a708f8fSGustavo F. Padovan 14240a708f8fSGustavo F. Padovan return sent; 14250a708f8fSGustavo F. Padovan } 14260a708f8fSGustavo F. Padovan 1427fe4128e0SGustavo F. Padovan struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 14280a708f8fSGustavo F. Padovan { 1429fe4128e0SGustavo F. Padovan struct sock *sk = chan->sk; 14308c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 14310a708f8fSGustavo F. Padovan struct sk_buff *skb; 14320a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 14330a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 14340a708f8fSGustavo F. Padovan 14350a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 14360a708f8fSGustavo F. Padovan 14370a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 14380a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 14390a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 14400a708f8fSGustavo F. Padovan if (!skb) 14410a708f8fSGustavo F. Padovan return ERR_PTR(err); 14420a708f8fSGustavo F. Padovan 14430a708f8fSGustavo F. Padovan /* Create L2CAP header */ 14440a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 1445fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 14460a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 1447fe4128e0SGustavo F. Padovan put_unaligned_le16(chan->psm, skb_put(skb, 2)); 14480a708f8fSGustavo F. Padovan 14490a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 14500a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 14510a708f8fSGustavo F. Padovan kfree_skb(skb); 14520a708f8fSGustavo F. Padovan return ERR_PTR(err); 14530a708f8fSGustavo F. Padovan } 14540a708f8fSGustavo F. Padovan return skb; 14550a708f8fSGustavo F. Padovan } 14560a708f8fSGustavo F. Padovan 1457fe4128e0SGustavo F. Padovan struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 14580a708f8fSGustavo F. Padovan { 1459fe4128e0SGustavo F. Padovan struct sock *sk = chan->sk; 14608c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 14610a708f8fSGustavo F. Padovan struct sk_buff *skb; 14620a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE; 14630a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 14640a708f8fSGustavo F. Padovan 14650a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 14660a708f8fSGustavo F. Padovan 14670a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 14680a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 14690a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 14700a708f8fSGustavo F. Padovan if (!skb) 14710a708f8fSGustavo F. Padovan return ERR_PTR(err); 14720a708f8fSGustavo F. Padovan 14730a708f8fSGustavo F. Padovan /* Create L2CAP header */ 14740a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 1475fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 14760a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 14770a708f8fSGustavo F. Padovan 14780a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 14790a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 14800a708f8fSGustavo F. Padovan kfree_skb(skb); 14810a708f8fSGustavo F. Padovan return ERR_PTR(err); 14820a708f8fSGustavo F. Padovan } 14830a708f8fSGustavo F. Padovan return skb; 14840a708f8fSGustavo F. Padovan } 14850a708f8fSGustavo F. Padovan 148647d1ec61SGustavo F. Padovan struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen) 14870a708f8fSGustavo F. Padovan { 148847d1ec61SGustavo F. Padovan struct sock *sk = chan->sk; 14898c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 14900a708f8fSGustavo F. Padovan struct sk_buff *skb; 14910a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 14920a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 14930a708f8fSGustavo F. Padovan 14940a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 14950a708f8fSGustavo F. Padovan 14960a708f8fSGustavo F. Padovan if (!conn) 14970a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 14980a708f8fSGustavo F. Padovan 14990a708f8fSGustavo F. Padovan if (sdulen) 15000a708f8fSGustavo F. Padovan hlen += 2; 15010a708f8fSGustavo F. Padovan 150247d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 15030a708f8fSGustavo F. Padovan hlen += 2; 15040a708f8fSGustavo F. Padovan 15050a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 15060a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 15070a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 15080a708f8fSGustavo F. Padovan if (!skb) 15090a708f8fSGustavo F. Padovan return ERR_PTR(err); 15100a708f8fSGustavo F. Padovan 15110a708f8fSGustavo F. Padovan /* Create L2CAP header */ 15120a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 1513fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 15140a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 15150a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 15160a708f8fSGustavo F. Padovan if (sdulen) 15170a708f8fSGustavo F. Padovan put_unaligned_le16(sdulen, skb_put(skb, 2)); 15180a708f8fSGustavo F. Padovan 15190a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 15200a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 15210a708f8fSGustavo F. Padovan kfree_skb(skb); 15220a708f8fSGustavo F. Padovan return ERR_PTR(err); 15230a708f8fSGustavo F. Padovan } 15240a708f8fSGustavo F. Padovan 152547d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 15260a708f8fSGustavo F. Padovan put_unaligned_le16(0, skb_put(skb, 2)); 15270a708f8fSGustavo F. Padovan 15280a708f8fSGustavo F. Padovan bt_cb(skb)->retries = 0; 15290a708f8fSGustavo F. Padovan return skb; 15300a708f8fSGustavo F. Padovan } 15310a708f8fSGustavo F. Padovan 15322c03a7a4SGustavo F. Padovan int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 15330a708f8fSGustavo F. Padovan { 15340a708f8fSGustavo F. Padovan struct sk_buff *skb; 15350a708f8fSGustavo F. Padovan struct sk_buff_head sar_queue; 15360a708f8fSGustavo F. Padovan u16 control; 15370a708f8fSGustavo F. Padovan size_t size = 0; 15380a708f8fSGustavo F. Padovan 15390a708f8fSGustavo F. Padovan skb_queue_head_init(&sar_queue); 15400a708f8fSGustavo F. Padovan control = L2CAP_SDU_START; 154147d1ec61SGustavo F. Padovan skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); 15420a708f8fSGustavo F. Padovan if (IS_ERR(skb)) 15430a708f8fSGustavo F. Padovan return PTR_ERR(skb); 15440a708f8fSGustavo F. Padovan 15450a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 15462c03a7a4SGustavo F. Padovan len -= chan->remote_mps; 15472c03a7a4SGustavo F. Padovan size += chan->remote_mps; 15480a708f8fSGustavo F. Padovan 15490a708f8fSGustavo F. Padovan while (len > 0) { 15500a708f8fSGustavo F. Padovan size_t buflen; 15510a708f8fSGustavo F. Padovan 15522c03a7a4SGustavo F. Padovan if (len > chan->remote_mps) { 15530a708f8fSGustavo F. Padovan control = L2CAP_SDU_CONTINUE; 15542c03a7a4SGustavo F. Padovan buflen = chan->remote_mps; 15550a708f8fSGustavo F. Padovan } else { 15560a708f8fSGustavo F. Padovan control = L2CAP_SDU_END; 15570a708f8fSGustavo F. Padovan buflen = len; 15580a708f8fSGustavo F. Padovan } 15590a708f8fSGustavo F. Padovan 156047d1ec61SGustavo F. Padovan skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); 15610a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 15620a708f8fSGustavo F. Padovan skb_queue_purge(&sar_queue); 15630a708f8fSGustavo F. Padovan return PTR_ERR(skb); 15640a708f8fSGustavo F. Padovan } 15650a708f8fSGustavo F. Padovan 15660a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 15670a708f8fSGustavo F. Padovan len -= buflen; 15680a708f8fSGustavo F. Padovan size += buflen; 15690a708f8fSGustavo F. Padovan } 157058d35f87SGustavo F. Padovan skb_queue_splice_tail(&sar_queue, &chan->tx_q); 157158d35f87SGustavo F. Padovan if (chan->tx_send_head == NULL) 157258d35f87SGustavo F. Padovan chan->tx_send_head = sar_queue.next; 15730a708f8fSGustavo F. Padovan 15740a708f8fSGustavo F. Padovan return size; 15750a708f8fSGustavo F. Padovan } 15760a708f8fSGustavo F. Padovan 15779a91a04aSGustavo F. Padovan int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 15789a91a04aSGustavo F. Padovan { 15799a91a04aSGustavo F. Padovan struct sk_buff *skb; 15809a91a04aSGustavo F. Padovan u16 control; 15819a91a04aSGustavo F. Padovan int err; 15829a91a04aSGustavo F. Padovan 15839a91a04aSGustavo F. Padovan /* Connectionless channel */ 1584715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 15859a91a04aSGustavo F. Padovan skb = l2cap_create_connless_pdu(chan, msg, len); 15869a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 15879a91a04aSGustavo F. Padovan return PTR_ERR(skb); 15889a91a04aSGustavo F. Padovan 15899a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 15909a91a04aSGustavo F. Padovan return len; 15919a91a04aSGustavo F. Padovan } 15929a91a04aSGustavo F. Padovan 15939a91a04aSGustavo F. Padovan switch (chan->mode) { 15949a91a04aSGustavo F. Padovan case L2CAP_MODE_BASIC: 15959a91a04aSGustavo F. Padovan /* Check outgoing MTU */ 15969a91a04aSGustavo F. Padovan if (len > chan->omtu) 15979a91a04aSGustavo F. Padovan return -EMSGSIZE; 15989a91a04aSGustavo F. Padovan 15999a91a04aSGustavo F. Padovan /* Create a basic PDU */ 16009a91a04aSGustavo F. Padovan skb = l2cap_create_basic_pdu(chan, msg, len); 16019a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 16029a91a04aSGustavo F. Padovan return PTR_ERR(skb); 16039a91a04aSGustavo F. Padovan 16049a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 16059a91a04aSGustavo F. Padovan err = len; 16069a91a04aSGustavo F. Padovan break; 16079a91a04aSGustavo F. Padovan 16089a91a04aSGustavo F. Padovan case L2CAP_MODE_ERTM: 16099a91a04aSGustavo F. Padovan case L2CAP_MODE_STREAMING: 16109a91a04aSGustavo F. Padovan /* Entire SDU fits into one PDU */ 16119a91a04aSGustavo F. Padovan if (len <= chan->remote_mps) { 16129a91a04aSGustavo F. Padovan control = L2CAP_SDU_UNSEGMENTED; 16139a91a04aSGustavo F. Padovan skb = l2cap_create_iframe_pdu(chan, msg, len, control, 16149a91a04aSGustavo F. Padovan 0); 16159a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 16169a91a04aSGustavo F. Padovan return PTR_ERR(skb); 16179a91a04aSGustavo F. Padovan 16189a91a04aSGustavo F. Padovan __skb_queue_tail(&chan->tx_q, skb); 16199a91a04aSGustavo F. Padovan 16209a91a04aSGustavo F. Padovan if (chan->tx_send_head == NULL) 16219a91a04aSGustavo F. Padovan chan->tx_send_head = skb; 16229a91a04aSGustavo F. Padovan 16239a91a04aSGustavo F. Padovan } else { 16249a91a04aSGustavo F. Padovan /* Segment SDU into multiples PDUs */ 16259a91a04aSGustavo F. Padovan err = l2cap_sar_segment_sdu(chan, msg, len); 16269a91a04aSGustavo F. Padovan if (err < 0) 16279a91a04aSGustavo F. Padovan return err; 16289a91a04aSGustavo F. Padovan } 16299a91a04aSGustavo F. Padovan 16309a91a04aSGustavo F. Padovan if (chan->mode == L2CAP_MODE_STREAMING) { 16319a91a04aSGustavo F. Padovan l2cap_streaming_send(chan); 16329a91a04aSGustavo F. Padovan err = len; 16339a91a04aSGustavo F. Padovan break; 16349a91a04aSGustavo F. Padovan } 16359a91a04aSGustavo F. Padovan 16369a91a04aSGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && 16379a91a04aSGustavo F. Padovan (chan->conn_state & L2CAP_CONN_WAIT_F)) { 16389a91a04aSGustavo F. Padovan err = len; 16399a91a04aSGustavo F. Padovan break; 16409a91a04aSGustavo F. Padovan } 16419a91a04aSGustavo F. Padovan 16429a91a04aSGustavo F. Padovan err = l2cap_ertm_send(chan); 16439a91a04aSGustavo F. Padovan if (err >= 0) 16449a91a04aSGustavo F. Padovan err = len; 16459a91a04aSGustavo F. Padovan 16469a91a04aSGustavo F. Padovan break; 16479a91a04aSGustavo F. Padovan 16489a91a04aSGustavo F. Padovan default: 16499a91a04aSGustavo F. Padovan BT_DBG("bad state %1.1x", chan->mode); 16509a91a04aSGustavo F. Padovan err = -EBADFD; 16519a91a04aSGustavo F. Padovan } 16529a91a04aSGustavo F. Padovan 16539a91a04aSGustavo F. Padovan return err; 16549a91a04aSGustavo F. Padovan } 16559a91a04aSGustavo F. Padovan 16560a708f8fSGustavo F. Padovan static void l2cap_chan_ready(struct sock *sk) 16570a708f8fSGustavo F. Padovan { 16580a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 1659b4450035SGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 16600a708f8fSGustavo F. Padovan 16610a708f8fSGustavo F. Padovan BT_DBG("sk %p, parent %p", sk, parent); 16620a708f8fSGustavo F. Padovan 1663b4450035SGustavo F. Padovan chan->conf_state = 0; 1664ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 16650a708f8fSGustavo F. Padovan 16660a708f8fSGustavo F. Padovan if (!parent) { 16670a708f8fSGustavo F. Padovan /* Outgoing channel. 16680a708f8fSGustavo F. Padovan * Wake up socket sleeping on connect. 16690a708f8fSGustavo F. Padovan */ 16700a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 16710a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 16720a708f8fSGustavo F. Padovan } else { 16730a708f8fSGustavo F. Padovan /* Incoming channel. 16740a708f8fSGustavo F. Padovan * Wake up socket sleeping on accept. 16750a708f8fSGustavo F. Padovan */ 16760a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 16770a708f8fSGustavo F. Padovan } 16780a708f8fSGustavo F. Padovan } 16790a708f8fSGustavo F. Padovan 16800a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 16810a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 16820a708f8fSGustavo F. Padovan { 16830a708f8fSGustavo F. Padovan struct sk_buff *nskb; 168448454079SGustavo F. Padovan struct l2cap_chan *chan; 16850a708f8fSGustavo F. Padovan 16860a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 16870a708f8fSGustavo F. Padovan 1688baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 1689baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 169048454079SGustavo F. Padovan struct sock *sk = chan->sk; 1691715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_RAW) 16920a708f8fSGustavo F. Padovan continue; 16930a708f8fSGustavo F. Padovan 16940a708f8fSGustavo F. Padovan /* Don't send frame to the socket it came from */ 16950a708f8fSGustavo F. Padovan if (skb->sk == sk) 16960a708f8fSGustavo F. Padovan continue; 16970a708f8fSGustavo F. Padovan nskb = skb_clone(skb, GFP_ATOMIC); 16980a708f8fSGustavo F. Padovan if (!nskb) 16990a708f8fSGustavo F. Padovan continue; 17000a708f8fSGustavo F. Padovan 17010a708f8fSGustavo F. Padovan if (sock_queue_rcv_skb(sk, nskb)) 17020a708f8fSGustavo F. Padovan kfree_skb(nskb); 17030a708f8fSGustavo F. Padovan } 1704baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 17050a708f8fSGustavo F. Padovan } 17060a708f8fSGustavo F. Padovan 17070a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 17080a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 17090a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data) 17100a708f8fSGustavo F. Padovan { 17110a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 17120a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 17130a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 17140a708f8fSGustavo F. Padovan int len, count; 17150a708f8fSGustavo F. Padovan 17160a708f8fSGustavo F. Padovan BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", 17170a708f8fSGustavo F. Padovan conn, code, ident, dlen); 17180a708f8fSGustavo F. Padovan 17190a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 17200a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 17210a708f8fSGustavo F. Padovan 17220a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 17230a708f8fSGustavo F. Padovan if (!skb) 17240a708f8fSGustavo F. Padovan return NULL; 17250a708f8fSGustavo F. Padovan 17260a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 17270a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 17283300d9a9SClaudio Takahasi 17293300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 17303300d9a9SClaudio Takahasi lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); 17313300d9a9SClaudio Takahasi else 17320a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); 17330a708f8fSGustavo F. Padovan 17340a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 17350a708f8fSGustavo F. Padovan cmd->code = code; 17360a708f8fSGustavo F. Padovan cmd->ident = ident; 17370a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 17380a708f8fSGustavo F. Padovan 17390a708f8fSGustavo F. Padovan if (dlen) { 17400a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 17410a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 17420a708f8fSGustavo F. Padovan data += count; 17430a708f8fSGustavo F. Padovan } 17440a708f8fSGustavo F. Padovan 17450a708f8fSGustavo F. Padovan len -= skb->len; 17460a708f8fSGustavo F. Padovan 17470a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 17480a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 17490a708f8fSGustavo F. Padovan while (len) { 17500a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 17510a708f8fSGustavo F. Padovan 17520a708f8fSGustavo F. Padovan *frag = bt_skb_alloc(count, GFP_ATOMIC); 17530a708f8fSGustavo F. Padovan if (!*frag) 17540a708f8fSGustavo F. Padovan goto fail; 17550a708f8fSGustavo F. Padovan 17560a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 17570a708f8fSGustavo F. Padovan 17580a708f8fSGustavo F. Padovan len -= count; 17590a708f8fSGustavo F. Padovan data += count; 17600a708f8fSGustavo F. Padovan 17610a708f8fSGustavo F. Padovan frag = &(*frag)->next; 17620a708f8fSGustavo F. Padovan } 17630a708f8fSGustavo F. Padovan 17640a708f8fSGustavo F. Padovan return skb; 17650a708f8fSGustavo F. Padovan 17660a708f8fSGustavo F. Padovan fail: 17670a708f8fSGustavo F. Padovan kfree_skb(skb); 17680a708f8fSGustavo F. Padovan return NULL; 17690a708f8fSGustavo F. Padovan } 17700a708f8fSGustavo F. Padovan 17710a708f8fSGustavo F. Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) 17720a708f8fSGustavo F. Padovan { 17730a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 17740a708f8fSGustavo F. Padovan int len; 17750a708f8fSGustavo F. Padovan 17760a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 17770a708f8fSGustavo F. Padovan *ptr += len; 17780a708f8fSGustavo F. Padovan 17790a708f8fSGustavo F. Padovan *type = opt->type; 17800a708f8fSGustavo F. Padovan *olen = opt->len; 17810a708f8fSGustavo F. Padovan 17820a708f8fSGustavo F. Padovan switch (opt->len) { 17830a708f8fSGustavo F. Padovan case 1: 17840a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 17850a708f8fSGustavo F. Padovan break; 17860a708f8fSGustavo F. Padovan 17870a708f8fSGustavo F. Padovan case 2: 17880a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 17890a708f8fSGustavo F. Padovan break; 17900a708f8fSGustavo F. Padovan 17910a708f8fSGustavo F. Padovan case 4: 17920a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 17930a708f8fSGustavo F. Padovan break; 17940a708f8fSGustavo F. Padovan 17950a708f8fSGustavo F. Padovan default: 17960a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 17970a708f8fSGustavo F. Padovan break; 17980a708f8fSGustavo F. Padovan } 17990a708f8fSGustavo F. Padovan 18000a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); 18010a708f8fSGustavo F. Padovan return len; 18020a708f8fSGustavo F. Padovan } 18030a708f8fSGustavo F. Padovan 18040a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 18050a708f8fSGustavo F. Padovan { 18060a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 18070a708f8fSGustavo F. Padovan 18080a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); 18090a708f8fSGustavo F. Padovan 18100a708f8fSGustavo F. Padovan opt->type = type; 18110a708f8fSGustavo F. Padovan opt->len = len; 18120a708f8fSGustavo F. Padovan 18130a708f8fSGustavo F. Padovan switch (len) { 18140a708f8fSGustavo F. Padovan case 1: 18150a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 18160a708f8fSGustavo F. Padovan break; 18170a708f8fSGustavo F. Padovan 18180a708f8fSGustavo F. Padovan case 2: 18190a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 18200a708f8fSGustavo F. Padovan break; 18210a708f8fSGustavo F. Padovan 18220a708f8fSGustavo F. Padovan case 4: 18230a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 18240a708f8fSGustavo F. Padovan break; 18250a708f8fSGustavo F. Padovan 18260a708f8fSGustavo F. Padovan default: 18270a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 18280a708f8fSGustavo F. Padovan break; 18290a708f8fSGustavo F. Padovan } 18300a708f8fSGustavo F. Padovan 18310a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 18320a708f8fSGustavo F. Padovan } 18330a708f8fSGustavo F. Padovan 18340a708f8fSGustavo F. Padovan static void l2cap_ack_timeout(unsigned long arg) 18350a708f8fSGustavo F. Padovan { 1836525cd185SGustavo F. Padovan struct l2cap_chan *chan = (void *) arg; 18370a708f8fSGustavo F. Padovan 1838525cd185SGustavo F. Padovan bh_lock_sock(chan->sk); 1839525cd185SGustavo F. Padovan l2cap_send_ack(chan); 1840525cd185SGustavo F. Padovan bh_unlock_sock(chan->sk); 18410a708f8fSGustavo F. Padovan } 18420a708f8fSGustavo F. Padovan 1843525cd185SGustavo F. Padovan static inline void l2cap_ertm_init(struct l2cap_chan *chan) 18440a708f8fSGustavo F. Padovan { 1845525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 1846525cd185SGustavo F. Padovan 184742e5c802SGustavo F. Padovan chan->expected_ack_seq = 0; 18486a026610SGustavo F. Padovan chan->unacked_frames = 0; 184942e5c802SGustavo F. Padovan chan->buffer_seq = 0; 18506a026610SGustavo F. Padovan chan->num_acked = 0; 18516a026610SGustavo F. Padovan chan->frames_sent = 0; 18520a708f8fSGustavo F. Padovan 1853e92c8e70SGustavo F. Padovan setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, 1854e92c8e70SGustavo F. Padovan (unsigned long) chan); 1855e92c8e70SGustavo F. Padovan setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, 1856e92c8e70SGustavo F. Padovan (unsigned long) chan); 1857e92c8e70SGustavo F. Padovan setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); 18580a708f8fSGustavo F. Padovan 1859f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->srej_q); 1860f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->busy_q); 18610a708f8fSGustavo F. Padovan 186239d5a3eeSGustavo F. Padovan INIT_LIST_HEAD(&chan->srej_l); 186339d5a3eeSGustavo F. Padovan 1864311bb895SGustavo F. Padovan INIT_WORK(&chan->busy_work, l2cap_busy_work); 18650a708f8fSGustavo F. Padovan 18660a708f8fSGustavo F. Padovan sk->sk_backlog_rcv = l2cap_ertm_data_rcv; 18670a708f8fSGustavo F. Padovan } 18680a708f8fSGustavo F. Padovan 18690a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 18700a708f8fSGustavo F. Padovan { 18710a708f8fSGustavo F. Padovan switch (mode) { 18720a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 18730a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 18740a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 18750a708f8fSGustavo F. Padovan return mode; 18760a708f8fSGustavo F. Padovan /* fall through */ 18770a708f8fSGustavo F. Padovan default: 18780a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 18790a708f8fSGustavo F. Padovan } 18800a708f8fSGustavo F. Padovan } 18810a708f8fSGustavo F. Padovan 1882710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 18830a708f8fSGustavo F. Padovan { 18840a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 18850c1bc5c6SGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = chan->mode }; 18860a708f8fSGustavo F. Padovan void *ptr = req->data; 18870a708f8fSGustavo F. Padovan 188849208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 18890a708f8fSGustavo F. Padovan 189073ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 18910a708f8fSGustavo F. Padovan goto done; 18920a708f8fSGustavo F. Padovan 18930c1bc5c6SGustavo F. Padovan switch (chan->mode) { 18940a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 18950a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 1896b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_STATE2_DEVICE) 18970a708f8fSGustavo F. Padovan break; 18980a708f8fSGustavo F. Padovan 18990a708f8fSGustavo F. Padovan /* fall through */ 19000a708f8fSGustavo F. Padovan default: 19018c1d787bSGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); 19020a708f8fSGustavo F. Padovan break; 19030a708f8fSGustavo F. Padovan } 19040a708f8fSGustavo F. Padovan 19050a708f8fSGustavo F. Padovan done: 19060c1bc5c6SGustavo F. Padovan if (chan->imtu != L2CAP_DEFAULT_MTU) 19070c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 19080a708f8fSGustavo F. Padovan 19090c1bc5c6SGustavo F. Padovan switch (chan->mode) { 19100a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 19118c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && 19128c1d787bSGustavo F. Padovan !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) 19130a708f8fSGustavo F. Padovan break; 19140a708f8fSGustavo F. Padovan 19150a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 19160a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 19170a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 19180a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 19190a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 19200a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 19210a708f8fSGustavo F. Padovan 19220a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 19230a708f8fSGustavo F. Padovan (unsigned long) &rfc); 19240a708f8fSGustavo F. Padovan break; 19250a708f8fSGustavo F. Padovan 19260a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 19270a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 192847d1ec61SGustavo F. Padovan rfc.txwin_size = chan->tx_win; 192947d1ec61SGustavo F. Padovan rfc.max_transmit = chan->max_tx; 19300a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 19310a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 19320a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 19338c1d787bSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) 19348c1d787bSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); 19350a708f8fSGustavo F. Padovan 19360a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 19370a708f8fSGustavo F. Padovan (unsigned long) &rfc); 19380a708f8fSGustavo F. Padovan 19398c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) 19400a708f8fSGustavo F. Padovan break; 19410a708f8fSGustavo F. Padovan 194247d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 1943b4450035SGustavo F. Padovan chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { 194447d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 194547d1ec61SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); 19460a708f8fSGustavo F. Padovan } 19470a708f8fSGustavo F. Padovan break; 19480a708f8fSGustavo F. Padovan 19490a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 19500a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 19510a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 19520a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 19530a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 19540a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 19550a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 19568c1d787bSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) 19578c1d787bSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); 19580a708f8fSGustavo F. Padovan 19590a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 19600a708f8fSGustavo F. Padovan (unsigned long) &rfc); 19610a708f8fSGustavo F. Padovan 19628c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) 19630a708f8fSGustavo F. Padovan break; 19640a708f8fSGustavo F. Padovan 196547d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 1966b4450035SGustavo F. Padovan chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { 196747d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 196847d1ec61SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); 19690a708f8fSGustavo F. Padovan } 19700a708f8fSGustavo F. Padovan break; 19710a708f8fSGustavo F. Padovan } 19720a708f8fSGustavo F. Padovan 1973fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 19740a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0); 19750a708f8fSGustavo F. Padovan 19760a708f8fSGustavo F. Padovan return ptr - data; 19770a708f8fSGustavo F. Padovan } 19780a708f8fSGustavo F. Padovan 197973ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 19800a708f8fSGustavo F. Padovan { 19810a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 19820a708f8fSGustavo F. Padovan void *ptr = rsp->data; 198373ffa904SGustavo F. Padovan void *req = chan->conf_req; 198473ffa904SGustavo F. Padovan int len = chan->conf_len; 19850a708f8fSGustavo F. Padovan int type, hint, olen; 19860a708f8fSGustavo F. Padovan unsigned long val; 19870a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 19880a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 19890a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 19900a708f8fSGustavo F. Padovan 199173ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 19920a708f8fSGustavo F. Padovan 19930a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 19940a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 19950a708f8fSGustavo F. Padovan 19960a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 19970a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 19980a708f8fSGustavo F. Padovan 19990a708f8fSGustavo F. Padovan switch (type) { 20000a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 20010a708f8fSGustavo F. Padovan mtu = val; 20020a708f8fSGustavo F. Padovan break; 20030a708f8fSGustavo F. Padovan 20040a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 20050c1bc5c6SGustavo F. Padovan chan->flush_to = val; 20060a708f8fSGustavo F. Padovan break; 20070a708f8fSGustavo F. Padovan 20080a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 20090a708f8fSGustavo F. Padovan break; 20100a708f8fSGustavo F. Padovan 20110a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 20120a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 20130a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 20140a708f8fSGustavo F. Padovan break; 20150a708f8fSGustavo F. Padovan 20160a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 20170a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 2018b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_NO_FCS_RECV; 20190a708f8fSGustavo F. Padovan 20200a708f8fSGustavo F. Padovan break; 20210a708f8fSGustavo F. Padovan 20220a708f8fSGustavo F. Padovan default: 20230a708f8fSGustavo F. Padovan if (hint) 20240a708f8fSGustavo F. Padovan break; 20250a708f8fSGustavo F. Padovan 20260a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 20270a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 20280a708f8fSGustavo F. Padovan break; 20290a708f8fSGustavo F. Padovan } 20300a708f8fSGustavo F. Padovan } 20310a708f8fSGustavo F. Padovan 203273ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 20330a708f8fSGustavo F. Padovan goto done; 20340a708f8fSGustavo F. Padovan 20350c1bc5c6SGustavo F. Padovan switch (chan->mode) { 20360a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 20370a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 2038b4450035SGustavo F. Padovan if (!(chan->conf_state & L2CAP_CONF_STATE2_DEVICE)) { 20390c1bc5c6SGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, 20408c1d787bSGustavo F. Padovan chan->conn->feat_mask); 20410a708f8fSGustavo F. Padovan break; 20420a708f8fSGustavo F. Padovan } 20430a708f8fSGustavo F. Padovan 20440c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) 20450a708f8fSGustavo F. Padovan return -ECONNREFUSED; 20460a708f8fSGustavo F. Padovan 20470a708f8fSGustavo F. Padovan break; 20480a708f8fSGustavo F. Padovan } 20490a708f8fSGustavo F. Padovan 20500a708f8fSGustavo F. Padovan done: 20510c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) { 20520a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 20530c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 20540a708f8fSGustavo F. Padovan 205573ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 20560a708f8fSGustavo F. Padovan return -ECONNREFUSED; 20570a708f8fSGustavo F. Padovan 20580a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 20590a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 20600a708f8fSGustavo F. Padovan } 20610a708f8fSGustavo F. Padovan 20620a708f8fSGustavo F. Padovan 20630a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 20640a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 20650a708f8fSGustavo F. Padovan * which ones we don't like. */ 20660a708f8fSGustavo F. Padovan 20670a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 20680a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 20690a708f8fSGustavo F. Padovan else { 20700c1bc5c6SGustavo F. Padovan chan->omtu = mtu; 2071b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_MTU_DONE; 20720a708f8fSGustavo F. Padovan } 20730c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); 20740a708f8fSGustavo F. Padovan 20750a708f8fSGustavo F. Padovan switch (rfc.mode) { 20760a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 207747d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 2078b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_MODE_DONE; 20790a708f8fSGustavo F. Padovan break; 20800a708f8fSGustavo F. Padovan 20810a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 20822c03a7a4SGustavo F. Padovan chan->remote_tx_win = rfc.txwin_size; 20832c03a7a4SGustavo F. Padovan chan->remote_max_tx = rfc.max_transmit; 20840a708f8fSGustavo F. Padovan 20858c1d787bSGustavo F. Padovan if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) 20868c1d787bSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); 20870a708f8fSGustavo F. Padovan 20882c03a7a4SGustavo F. Padovan chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); 20890a708f8fSGustavo F. Padovan 20900a708f8fSGustavo F. Padovan rfc.retrans_timeout = 20910a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); 20920a708f8fSGustavo F. Padovan rfc.monitor_timeout = 20930a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); 20940a708f8fSGustavo F. Padovan 2095b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_MODE_DONE; 20960a708f8fSGustavo F. Padovan 20970a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 20980a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 20990a708f8fSGustavo F. Padovan 21000a708f8fSGustavo F. Padovan break; 21010a708f8fSGustavo F. Padovan 21020a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 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 2108b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_MODE_DONE; 21090a708f8fSGustavo F. Padovan 21100a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 21110a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 21120a708f8fSGustavo F. Padovan 21130a708f8fSGustavo F. Padovan break; 21140a708f8fSGustavo F. Padovan 21150a708f8fSGustavo F. Padovan default: 21160a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 21170a708f8fSGustavo F. Padovan 21180a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 21190c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 21200a708f8fSGustavo F. Padovan } 21210a708f8fSGustavo F. Padovan 21220a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 2123b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_OUTPUT_DONE; 21240a708f8fSGustavo F. Padovan } 2125fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 21260a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 21270a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(0x0000); 21280a708f8fSGustavo F. Padovan 21290a708f8fSGustavo F. Padovan return ptr - data; 21300a708f8fSGustavo F. Padovan } 21310a708f8fSGustavo F. Padovan 2132b4450035SGustavo F. Padovan static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) 21330a708f8fSGustavo F. Padovan { 21340a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 21350a708f8fSGustavo F. Padovan void *ptr = req->data; 21360a708f8fSGustavo F. Padovan int type, olen; 21370a708f8fSGustavo F. Padovan unsigned long val; 21380a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 21390a708f8fSGustavo F. Padovan 2140fe4128e0SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); 21410a708f8fSGustavo F. Padovan 21420a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 21430a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 21440a708f8fSGustavo F. Padovan 21450a708f8fSGustavo F. Padovan switch (type) { 21460a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 21470a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 21480a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 21490c1bc5c6SGustavo F. Padovan chan->imtu = L2CAP_DEFAULT_MIN_MTU; 21500a708f8fSGustavo F. Padovan } else 21510c1bc5c6SGustavo F. Padovan chan->imtu = val; 21520c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 21530a708f8fSGustavo F. Padovan break; 21540a708f8fSGustavo F. Padovan 21550a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 21560c1bc5c6SGustavo F. Padovan chan->flush_to = val; 21570a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 21580c1bc5c6SGustavo F. Padovan 2, chan->flush_to); 21590a708f8fSGustavo F. Padovan break; 21600a708f8fSGustavo F. Padovan 21610a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 21620a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 21630a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 21640a708f8fSGustavo F. Padovan 2165b4450035SGustavo F. Padovan if ((chan->conf_state & L2CAP_CONF_STATE2_DEVICE) && 21660c1bc5c6SGustavo F. Padovan rfc.mode != chan->mode) 21670a708f8fSGustavo F. Padovan return -ECONNREFUSED; 21680a708f8fSGustavo F. Padovan 216947d1ec61SGustavo F. Padovan chan->fcs = 0; 21700a708f8fSGustavo F. Padovan 21710a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 21720a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 21730a708f8fSGustavo F. Padovan break; 21740a708f8fSGustavo F. Padovan } 21750a708f8fSGustavo F. Padovan } 21760a708f8fSGustavo F. Padovan 21770c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) 21780a708f8fSGustavo F. Padovan return -ECONNREFUSED; 21790a708f8fSGustavo F. Padovan 21800c1bc5c6SGustavo F. Padovan chan->mode = rfc.mode; 21810a708f8fSGustavo F. Padovan 21820a708f8fSGustavo F. Padovan if (*result == L2CAP_CONF_SUCCESS) { 21830a708f8fSGustavo F. Padovan switch (rfc.mode) { 21840a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 218547d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 218647d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 218747d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 21880a708f8fSGustavo F. Padovan break; 21890a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 219047d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 21910a708f8fSGustavo F. Padovan } 21920a708f8fSGustavo F. Padovan } 21930a708f8fSGustavo F. Padovan 2194fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 21950a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0x0000); 21960a708f8fSGustavo F. Padovan 21970a708f8fSGustavo F. Padovan return ptr - data; 21980a708f8fSGustavo F. Padovan } 21990a708f8fSGustavo F. Padovan 2200fe4128e0SGustavo F. Padovan static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) 22010a708f8fSGustavo F. Padovan { 22020a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 22030a708f8fSGustavo F. Padovan void *ptr = rsp->data; 22040a708f8fSGustavo F. Padovan 2205fe4128e0SGustavo F. Padovan BT_DBG("chan %p", chan); 22060a708f8fSGustavo F. Padovan 2207fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 22080a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 22090a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 22100a708f8fSGustavo F. Padovan 22110a708f8fSGustavo F. Padovan return ptr - data; 22120a708f8fSGustavo F. Padovan } 22130a708f8fSGustavo F. Padovan 22148c1d787bSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) 2215710f9b0aSGustavo F. Padovan { 2216710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 22178c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 2218710f9b0aSGustavo F. Padovan u8 buf[128]; 2219710f9b0aSGustavo F. Padovan 2220fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 2221fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 2222710f9b0aSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 2223710f9b0aSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 2224710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 2225710f9b0aSGustavo F. Padovan L2CAP_CONN_RSP, sizeof(rsp), &rsp); 2226710f9b0aSGustavo F. Padovan 2227b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_REQ_SENT) 2228710f9b0aSGustavo F. Padovan return; 2229710f9b0aSGustavo F. Padovan 2230b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 2231710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 2232710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 2233710f9b0aSGustavo F. Padovan chan->num_conf_req++; 2234710f9b0aSGustavo F. Padovan } 2235710f9b0aSGustavo F. Padovan 223647d1ec61SGustavo F. Padovan static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) 22370a708f8fSGustavo F. Padovan { 22380a708f8fSGustavo F. Padovan int type, olen; 22390a708f8fSGustavo F. Padovan unsigned long val; 22400a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 22410a708f8fSGustavo F. Padovan 224247d1ec61SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); 22430a708f8fSGustavo F. Padovan 22440c1bc5c6SGustavo F. Padovan if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) 22450a708f8fSGustavo F. Padovan return; 22460a708f8fSGustavo F. Padovan 22470a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 22480a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 22490a708f8fSGustavo F. Padovan 22500a708f8fSGustavo F. Padovan switch (type) { 22510a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 22520a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 22530a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 22540a708f8fSGustavo F. Padovan goto done; 22550a708f8fSGustavo F. Padovan } 22560a708f8fSGustavo F. Padovan } 22570a708f8fSGustavo F. Padovan 22580a708f8fSGustavo F. Padovan done: 22590a708f8fSGustavo F. Padovan switch (rfc.mode) { 22600a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 226147d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 226247d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 226347d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 22640a708f8fSGustavo F. Padovan break; 22650a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 226647d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 22670a708f8fSGustavo F. Padovan } 22680a708f8fSGustavo F. Padovan } 22690a708f8fSGustavo F. Padovan 22700a708f8fSGustavo F. Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 22710a708f8fSGustavo F. Padovan { 22720a708f8fSGustavo F. Padovan struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; 22730a708f8fSGustavo F. Padovan 22740a708f8fSGustavo F. Padovan if (rej->reason != 0x0000) 22750a708f8fSGustavo F. Padovan return 0; 22760a708f8fSGustavo F. Padovan 22770a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 22780a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 22790a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 22800a708f8fSGustavo F. Padovan 22810a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 22820a708f8fSGustavo F. Padovan conn->info_ident = 0; 22830a708f8fSGustavo F. Padovan 22840a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 22850a708f8fSGustavo F. Padovan } 22860a708f8fSGustavo F. Padovan 22870a708f8fSGustavo F. Padovan return 0; 22880a708f8fSGustavo F. Padovan } 22890a708f8fSGustavo F. Padovan 22900a708f8fSGustavo F. Padovan static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 22910a708f8fSGustavo F. Padovan { 22920a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 22930a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 229423691d75SGustavo F. Padovan struct l2cap_chan *chan = NULL, *pchan; 22950a708f8fSGustavo F. Padovan struct sock *parent, *sk = NULL; 22960a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 22970a708f8fSGustavo F. Padovan 22980a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 22990a708f8fSGustavo F. Padovan __le16 psm = req->psm; 23000a708f8fSGustavo F. Padovan 23010a708f8fSGustavo F. Padovan BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); 23020a708f8fSGustavo F. Padovan 23030a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 230423691d75SGustavo F. Padovan pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); 230523691d75SGustavo F. Padovan if (!pchan) { 23060a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 23070a708f8fSGustavo F. Padovan goto sendresp; 23080a708f8fSGustavo F. Padovan } 23090a708f8fSGustavo F. Padovan 231023691d75SGustavo F. Padovan parent = pchan->sk; 231123691d75SGustavo F. Padovan 23120a708f8fSGustavo F. Padovan bh_lock_sock(parent); 23130a708f8fSGustavo F. Padovan 23140a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 23150a708f8fSGustavo F. Padovan if (psm != cpu_to_le16(0x0001) && 23160a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 23170a708f8fSGustavo F. Padovan conn->disc_reason = 0x05; 23180a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 23190a708f8fSGustavo F. Padovan goto response; 23200a708f8fSGustavo F. Padovan } 23210a708f8fSGustavo F. Padovan 23220a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 23230a708f8fSGustavo F. Padovan 23240a708f8fSGustavo F. Padovan /* Check for backlog size */ 23250a708f8fSGustavo F. Padovan if (sk_acceptq_is_full(parent)) { 23260a708f8fSGustavo F. Padovan BT_DBG("backlog full %d", parent->sk_ack_backlog); 23270a708f8fSGustavo F. Padovan goto response; 23280a708f8fSGustavo F. Padovan } 23290a708f8fSGustavo F. Padovan 233080808e43SGustavo F. Padovan chan = pchan->ops->new_connection(pchan->data); 233180808e43SGustavo F. Padovan if (!chan) 23320a708f8fSGustavo F. Padovan goto response; 23330a708f8fSGustavo F. Padovan 233480808e43SGustavo F. Padovan sk = chan->sk; 233580808e43SGustavo F. Padovan 2336baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 23370a708f8fSGustavo F. Padovan 23380a708f8fSGustavo F. Padovan /* Check if we already have channel with that dcid */ 2339baa7e1faSGustavo F. Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) { 2340baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 23410a708f8fSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 23420a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 23430a708f8fSGustavo F. Padovan goto response; 23440a708f8fSGustavo F. Padovan } 23450a708f8fSGustavo F. Padovan 23460a708f8fSGustavo F. Padovan hci_conn_hold(conn->hcon); 23470a708f8fSGustavo F. Padovan 23480a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->src, conn->src); 23490a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->dst, conn->dst); 2350fe4128e0SGustavo F. Padovan chan->psm = psm; 2351fe4128e0SGustavo F. Padovan chan->dcid = scid; 23520a708f8fSGustavo F. Padovan 2353d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 2354d1010240SGustavo F. Padovan 235548454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 235648454079SGustavo F. Padovan 2357fe4128e0SGustavo F. Padovan dcid = chan->scid; 23580a708f8fSGustavo F. Padovan 2359ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, sk->sk_sndtimeo); 23600a708f8fSGustavo F. Padovan 2361fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 23620a708f8fSGustavo F. Padovan 23630a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 23644343478fSGustavo F. Padovan if (l2cap_check_security(chan)) { 23650a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 23660a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 23670a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 23680a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 23690a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 23700a708f8fSGustavo F. Padovan } else { 23710a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 23720a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 23730a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 23740a708f8fSGustavo F. Padovan } 23750a708f8fSGustavo F. Padovan } else { 23760a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 23770a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 23780a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 23790a708f8fSGustavo F. Padovan } 23800a708f8fSGustavo F. Padovan } else { 23810a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 23820a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 23830a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 23840a708f8fSGustavo F. Padovan } 23850a708f8fSGustavo F. Padovan 2386baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 23870a708f8fSGustavo F. Padovan 23880a708f8fSGustavo F. Padovan response: 23890a708f8fSGustavo F. Padovan bh_unlock_sock(parent); 23900a708f8fSGustavo F. Padovan 23910a708f8fSGustavo F. Padovan sendresp: 23920a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 23930a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 23940a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 23950a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 23960a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); 23970a708f8fSGustavo F. Padovan 23980a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 23990a708f8fSGustavo F. Padovan struct l2cap_info_req info; 24000a708f8fSGustavo F. Padovan info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 24010a708f8fSGustavo F. Padovan 24020a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 24030a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 24040a708f8fSGustavo F. Padovan 24050a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 24060a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 24070a708f8fSGustavo F. Padovan 24080a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 24090a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(info), &info); 24100a708f8fSGustavo F. Padovan } 24110a708f8fSGustavo F. Padovan 2412b4450035SGustavo F. Padovan if (chan && !(chan->conf_state & L2CAP_CONF_REQ_SENT) && 24130a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 24140a708f8fSGustavo F. Padovan u8 buf[128]; 2415b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 24160a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 241773ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 241873ffa904SGustavo F. Padovan chan->num_conf_req++; 24190a708f8fSGustavo F. Padovan } 24200a708f8fSGustavo F. Padovan 24210a708f8fSGustavo F. Padovan return 0; 24220a708f8fSGustavo F. Padovan } 24230a708f8fSGustavo F. Padovan 24240a708f8fSGustavo F. Padovan static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24250a708f8fSGustavo F. Padovan { 24260a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 24270a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 242848454079SGustavo F. Padovan struct l2cap_chan *chan; 24290a708f8fSGustavo F. Padovan struct sock *sk; 24300a708f8fSGustavo F. Padovan u8 req[128]; 24310a708f8fSGustavo F. Padovan 24320a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 24330a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 24340a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 24350a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 24360a708f8fSGustavo F. Padovan 24370a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); 24380a708f8fSGustavo F. Padovan 24390a708f8fSGustavo F. Padovan if (scid) { 2440baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 244148454079SGustavo F. Padovan if (!chan) 24420a708f8fSGustavo F. Padovan return -EFAULT; 24430a708f8fSGustavo F. Padovan } else { 2444baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_ident(conn, cmd->ident); 244548454079SGustavo F. Padovan if (!chan) 24460a708f8fSGustavo F. Padovan return -EFAULT; 24470a708f8fSGustavo F. Padovan } 24480a708f8fSGustavo F. Padovan 244948454079SGustavo F. Padovan sk = chan->sk; 245048454079SGustavo F. Padovan 24510a708f8fSGustavo F. Padovan switch (result) { 24520a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 24530a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 2454fc7f8a7eSGustavo F. Padovan chan->ident = 0; 2455fe4128e0SGustavo F. Padovan chan->dcid = dcid; 2456b4450035SGustavo F. Padovan chan->conf_state &= ~L2CAP_CONF_CONNECT_PEND; 24570a708f8fSGustavo F. Padovan 2458b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_REQ_SENT) 24590a708f8fSGustavo F. Padovan break; 24600a708f8fSGustavo F. Padovan 2461b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 24620a708f8fSGustavo F. Padovan 24630a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 246473ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 246573ffa904SGustavo F. Padovan chan->num_conf_req++; 24660a708f8fSGustavo F. Padovan break; 24670a708f8fSGustavo F. Padovan 24680a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 2469b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_CONNECT_PEND; 24700a708f8fSGustavo F. Padovan break; 24710a708f8fSGustavo F. Padovan 24720a708f8fSGustavo F. Padovan default: 24730a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 24740a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 24750a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 2476ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 2477ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 5); 24780a708f8fSGustavo F. Padovan break; 24790a708f8fSGustavo F. Padovan } 24800a708f8fSGustavo F. Padovan 248148454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 24820a708f8fSGustavo F. Padovan break; 24830a708f8fSGustavo F. Padovan } 24840a708f8fSGustavo F. Padovan 24850a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24860a708f8fSGustavo F. Padovan return 0; 24870a708f8fSGustavo F. Padovan } 24880a708f8fSGustavo F. Padovan 248947d1ec61SGustavo F. Padovan static inline void set_default_fcs(struct l2cap_chan *chan) 24900a708f8fSGustavo F. Padovan { 249147d1ec61SGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(chan->sk); 249247d1ec61SGustavo F. Padovan 24930a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 24940a708f8fSGustavo F. Padovan * sides request it. 24950a708f8fSGustavo F. Padovan */ 24960c1bc5c6SGustavo F. Padovan if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) 249747d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 2498b4450035SGustavo F. Padovan else if (!(pi->chan->conf_state & L2CAP_CONF_NO_FCS_RECV)) 249947d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_CRC16; 25000a708f8fSGustavo F. Padovan } 25010a708f8fSGustavo F. Padovan 25020a708f8fSGustavo F. Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 25030a708f8fSGustavo F. Padovan { 25040a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 25050a708f8fSGustavo F. Padovan u16 dcid, flags; 25060a708f8fSGustavo F. Padovan u8 rsp[64]; 250748454079SGustavo F. Padovan struct l2cap_chan *chan; 25080a708f8fSGustavo F. Padovan struct sock *sk; 25090a708f8fSGustavo F. Padovan int len; 25100a708f8fSGustavo F. Padovan 25110a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 25120a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 25130a708f8fSGustavo F. Padovan 25140a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 25150a708f8fSGustavo F. Padovan 2516baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 251748454079SGustavo F. Padovan if (!chan) 25180a708f8fSGustavo F. Padovan return -ENOENT; 25190a708f8fSGustavo F. Padovan 252048454079SGustavo F. Padovan sk = chan->sk; 252148454079SGustavo F. Padovan 25220a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONFIG) { 25230a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 25240a708f8fSGustavo F. Padovan 25250a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0x0002); 25260a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 25270a708f8fSGustavo F. Padovan sizeof(rej), &rej); 25280a708f8fSGustavo F. Padovan goto unlock; 25290a708f8fSGustavo F. Padovan } 25300a708f8fSGustavo F. Padovan 25310a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 25320a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 253373ffa904SGustavo F. Padovan if (chan->conf_len + len > sizeof(chan->conf_req)) { 25340a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 2535fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 25360a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 25370a708f8fSGustavo F. Padovan goto unlock; 25380a708f8fSGustavo F. Padovan } 25390a708f8fSGustavo F. Padovan 25400a708f8fSGustavo F. Padovan /* Store config. */ 254173ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 254273ffa904SGustavo F. Padovan chan->conf_len += len; 25430a708f8fSGustavo F. Padovan 25440a708f8fSGustavo F. Padovan if (flags & 0x0001) { 25450a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 25460a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 2547fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 25480a708f8fSGustavo F. Padovan L2CAP_CONF_SUCCESS, 0x0001), rsp); 25490a708f8fSGustavo F. Padovan goto unlock; 25500a708f8fSGustavo F. Padovan } 25510a708f8fSGustavo F. Padovan 25520a708f8fSGustavo F. Padovan /* Complete config. */ 255373ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 25540a708f8fSGustavo F. Padovan if (len < 0) { 2555e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 25560a708f8fSGustavo F. Padovan goto unlock; 25570a708f8fSGustavo F. Padovan } 25580a708f8fSGustavo F. Padovan 25590a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 256073ffa904SGustavo F. Padovan chan->num_conf_rsp++; 25610a708f8fSGustavo F. Padovan 25620a708f8fSGustavo F. Padovan /* Reset config buffer. */ 256373ffa904SGustavo F. Padovan chan->conf_len = 0; 25640a708f8fSGustavo F. Padovan 2565b4450035SGustavo F. Padovan if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE)) 25660a708f8fSGustavo F. Padovan goto unlock; 25670a708f8fSGustavo F. Padovan 2568b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_INPUT_DONE) { 256947d1ec61SGustavo F. Padovan set_default_fcs(chan); 25700a708f8fSGustavo F. Padovan 25710a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 25720a708f8fSGustavo F. Padovan 257342e5c802SGustavo F. Padovan chan->next_tx_seq = 0; 257442e5c802SGustavo F. Padovan chan->expected_tx_seq = 0; 257558d35f87SGustavo F. Padovan skb_queue_head_init(&chan->tx_q); 25760c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) 2577525cd185SGustavo F. Padovan l2cap_ertm_init(chan); 25780a708f8fSGustavo F. Padovan 25790a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 25800a708f8fSGustavo F. Padovan goto unlock; 25810a708f8fSGustavo F. Padovan } 25820a708f8fSGustavo F. Padovan 2583b4450035SGustavo F. Padovan if (!(chan->conf_state & L2CAP_CONF_REQ_SENT)) { 25840a708f8fSGustavo F. Padovan u8 buf[64]; 2585b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_REQ_SENT; 25860a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 258773ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 258873ffa904SGustavo F. Padovan chan->num_conf_req++; 25890a708f8fSGustavo F. Padovan } 25900a708f8fSGustavo F. Padovan 25910a708f8fSGustavo F. Padovan unlock: 25920a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 25930a708f8fSGustavo F. Padovan return 0; 25940a708f8fSGustavo F. Padovan } 25950a708f8fSGustavo F. Padovan 25960a708f8fSGustavo F. Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 25970a708f8fSGustavo F. Padovan { 25980a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 25990a708f8fSGustavo F. Padovan u16 scid, flags, result; 260048454079SGustavo F. Padovan struct l2cap_chan *chan; 26010a708f8fSGustavo F. Padovan struct sock *sk; 26020a708f8fSGustavo F. Padovan int len = cmd->len - sizeof(*rsp); 26030a708f8fSGustavo F. Padovan 26040a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 26050a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 26060a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 26070a708f8fSGustavo F. Padovan 26080a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", 26090a708f8fSGustavo F. Padovan scid, flags, result); 26100a708f8fSGustavo F. Padovan 2611baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 261248454079SGustavo F. Padovan if (!chan) 26130a708f8fSGustavo F. Padovan return 0; 26140a708f8fSGustavo F. Padovan 261548454079SGustavo F. Padovan sk = chan->sk; 261648454079SGustavo F. Padovan 26170a708f8fSGustavo F. Padovan switch (result) { 26180a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 261947d1ec61SGustavo F. Padovan l2cap_conf_rfc_get(chan, rsp->data, len); 26200a708f8fSGustavo F. Padovan break; 26210a708f8fSGustavo F. Padovan 26220a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 262373ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 26240a708f8fSGustavo F. Padovan char req[64]; 26250a708f8fSGustavo F. Padovan 26260a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 2627e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 26280a708f8fSGustavo F. Padovan goto done; 26290a708f8fSGustavo F. Padovan } 26300a708f8fSGustavo F. Padovan 26310a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 26320a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 2633b4450035SGustavo F. Padovan len = l2cap_parse_conf_rsp(chan, rsp->data, len, 2634b4450035SGustavo F. Padovan req, &result); 26350a708f8fSGustavo F. Padovan if (len < 0) { 2636e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 26370a708f8fSGustavo F. Padovan goto done; 26380a708f8fSGustavo F. Padovan } 26390a708f8fSGustavo F. Padovan 26400a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 26410a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 264273ffa904SGustavo F. Padovan chan->num_conf_req++; 26430a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 26440a708f8fSGustavo F. Padovan goto done; 26450a708f8fSGustavo F. Padovan break; 26460a708f8fSGustavo F. Padovan } 26470a708f8fSGustavo F. Padovan 26480a708f8fSGustavo F. Padovan default: 26490a708f8fSGustavo F. Padovan sk->sk_err = ECONNRESET; 2650ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ * 5); 2651e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 26520a708f8fSGustavo F. Padovan goto done; 26530a708f8fSGustavo F. Padovan } 26540a708f8fSGustavo F. Padovan 26550a708f8fSGustavo F. Padovan if (flags & 0x01) 26560a708f8fSGustavo F. Padovan goto done; 26570a708f8fSGustavo F. Padovan 2658b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_INPUT_DONE; 26590a708f8fSGustavo F. Padovan 2660b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_OUTPUT_DONE) { 266147d1ec61SGustavo F. Padovan set_default_fcs(chan); 26620a708f8fSGustavo F. Padovan 26630a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 266442e5c802SGustavo F. Padovan chan->next_tx_seq = 0; 266542e5c802SGustavo F. Padovan chan->expected_tx_seq = 0; 266658d35f87SGustavo F. Padovan skb_queue_head_init(&chan->tx_q); 26670c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) 2668525cd185SGustavo F. Padovan l2cap_ertm_init(chan); 26690a708f8fSGustavo F. Padovan 26700a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 26710a708f8fSGustavo F. Padovan } 26720a708f8fSGustavo F. Padovan 26730a708f8fSGustavo F. Padovan done: 26740a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 26750a708f8fSGustavo F. Padovan return 0; 26760a708f8fSGustavo F. Padovan } 26770a708f8fSGustavo F. Padovan 26780a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 26790a708f8fSGustavo F. Padovan { 26800a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 26810a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 26820a708f8fSGustavo F. Padovan u16 dcid, scid; 268348454079SGustavo F. Padovan struct l2cap_chan *chan; 26840a708f8fSGustavo F. Padovan struct sock *sk; 26850a708f8fSGustavo F. Padovan 26860a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 26870a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 26880a708f8fSGustavo F. Padovan 26890a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 26900a708f8fSGustavo F. Padovan 2691baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 269248454079SGustavo F. Padovan if (!chan) 26930a708f8fSGustavo F. Padovan return 0; 26940a708f8fSGustavo F. Padovan 269548454079SGustavo F. Padovan sk = chan->sk; 269648454079SGustavo F. Padovan 2697fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 2698fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 26990a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 27000a708f8fSGustavo F. Padovan 27010a708f8fSGustavo F. Padovan sk->sk_shutdown = SHUTDOWN_MASK; 27020a708f8fSGustavo F. Padovan 27030a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 27040a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 27050a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 2706ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 2707ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 5); 27080a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 27090a708f8fSGustavo F. Padovan return 0; 27100a708f8fSGustavo F. Padovan } 27110a708f8fSGustavo F. Padovan 271248454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 27130a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 27140a708f8fSGustavo F. Padovan 27150a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 27160a708f8fSGustavo F. Padovan return 0; 27170a708f8fSGustavo F. Padovan } 27180a708f8fSGustavo F. Padovan 27190a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 27200a708f8fSGustavo F. Padovan { 27210a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 27220a708f8fSGustavo F. Padovan u16 dcid, scid; 272348454079SGustavo F. Padovan struct l2cap_chan *chan; 27240a708f8fSGustavo F. Padovan struct sock *sk; 27250a708f8fSGustavo F. Padovan 27260a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 27270a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 27280a708f8fSGustavo F. Padovan 27290a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 27300a708f8fSGustavo F. Padovan 2731baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 273248454079SGustavo F. Padovan if (!chan) 27330a708f8fSGustavo F. Padovan return 0; 27340a708f8fSGustavo F. Padovan 273548454079SGustavo F. Padovan sk = chan->sk; 273648454079SGustavo F. Padovan 27370a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 27380a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 27390a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 2740ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 2741ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 5); 27420a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 27430a708f8fSGustavo F. Padovan return 0; 27440a708f8fSGustavo F. Padovan } 27450a708f8fSGustavo F. Padovan 274648454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 27470a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 27480a708f8fSGustavo F. Padovan 27490a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 27500a708f8fSGustavo F. Padovan return 0; 27510a708f8fSGustavo F. Padovan } 27520a708f8fSGustavo F. Padovan 27530a708f8fSGustavo F. Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 27540a708f8fSGustavo F. Padovan { 27550a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 27560a708f8fSGustavo F. Padovan u16 type; 27570a708f8fSGustavo F. Padovan 27580a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 27590a708f8fSGustavo F. Padovan 27600a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 27610a708f8fSGustavo F. Padovan 27620a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 27630a708f8fSGustavo F. Padovan u8 buf[8]; 27640a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 27650a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 27660a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 27670a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 27680a708f8fSGustavo F. Padovan if (!disable_ertm) 27690a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 27700a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 27710a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 27720a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 27730a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 27740a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 27750a708f8fSGustavo F. Padovan u8 buf[12]; 27760a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 27770a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 27780a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 27790a708f8fSGustavo F. Padovan memcpy(buf + 4, l2cap_fixed_chan, 8); 27800a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 27810a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 27820a708f8fSGustavo F. Padovan } else { 27830a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 27840a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 27850a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); 27860a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 27870a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(rsp), &rsp); 27880a708f8fSGustavo F. Padovan } 27890a708f8fSGustavo F. Padovan 27900a708f8fSGustavo F. Padovan return 0; 27910a708f8fSGustavo F. Padovan } 27920a708f8fSGustavo F. Padovan 27930a708f8fSGustavo F. Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 27940a708f8fSGustavo F. Padovan { 27950a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 27960a708f8fSGustavo F. Padovan u16 type, result; 27970a708f8fSGustavo F. Padovan 27980a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 27990a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 28000a708f8fSGustavo F. Padovan 28010a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 28020a708f8fSGustavo F. Padovan 2803e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 2804e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 2805e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 2806e90165beSAndrei Emeltchenko return 0; 2807e90165beSAndrei Emeltchenko 28080a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 28090a708f8fSGustavo F. Padovan 28100a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 28110a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 28120a708f8fSGustavo F. Padovan conn->info_ident = 0; 28130a708f8fSGustavo F. Padovan 28140a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 28150a708f8fSGustavo F. Padovan 28160a708f8fSGustavo F. Padovan return 0; 28170a708f8fSGustavo F. Padovan } 28180a708f8fSGustavo F. Padovan 28190a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 28200a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 28210a708f8fSGustavo F. Padovan 28220a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 28230a708f8fSGustavo F. Padovan struct l2cap_info_req req; 28240a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 28250a708f8fSGustavo F. Padovan 28260a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 28270a708f8fSGustavo F. Padovan 28280a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 28290a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 28300a708f8fSGustavo F. Padovan } else { 28310a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 28320a708f8fSGustavo F. Padovan conn->info_ident = 0; 28330a708f8fSGustavo F. Padovan 28340a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 28350a708f8fSGustavo F. Padovan } 28360a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 28370a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 28380a708f8fSGustavo F. Padovan conn->info_ident = 0; 28390a708f8fSGustavo F. Padovan 28400a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 28410a708f8fSGustavo F. Padovan } 28420a708f8fSGustavo F. Padovan 28430a708f8fSGustavo F. Padovan return 0; 28440a708f8fSGustavo F. Padovan } 28450a708f8fSGustavo F. Padovan 2846e2174ca4SGustavo F. Padovan static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, 2847de73115aSClaudio Takahasi u16 to_multiplier) 2848de73115aSClaudio Takahasi { 2849de73115aSClaudio Takahasi u16 max_latency; 2850de73115aSClaudio Takahasi 2851de73115aSClaudio Takahasi if (min > max || min < 6 || max > 3200) 2852de73115aSClaudio Takahasi return -EINVAL; 2853de73115aSClaudio Takahasi 2854de73115aSClaudio Takahasi if (to_multiplier < 10 || to_multiplier > 3200) 2855de73115aSClaudio Takahasi return -EINVAL; 2856de73115aSClaudio Takahasi 2857de73115aSClaudio Takahasi if (max >= to_multiplier * 8) 2858de73115aSClaudio Takahasi return -EINVAL; 2859de73115aSClaudio Takahasi 2860de73115aSClaudio Takahasi max_latency = (to_multiplier * 8 / max) - 1; 2861de73115aSClaudio Takahasi if (latency > 499 || latency > max_latency) 2862de73115aSClaudio Takahasi return -EINVAL; 2863de73115aSClaudio Takahasi 2864de73115aSClaudio Takahasi return 0; 2865de73115aSClaudio Takahasi } 2866de73115aSClaudio Takahasi 2867de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 2868de73115aSClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 2869de73115aSClaudio Takahasi { 2870de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 2871de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 2872de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 2873de73115aSClaudio Takahasi u16 min, max, latency, to_multiplier, cmd_len; 28742ce603ebSClaudio Takahasi int err; 2875de73115aSClaudio Takahasi 2876de73115aSClaudio Takahasi if (!(hcon->link_mode & HCI_LM_MASTER)) 2877de73115aSClaudio Takahasi return -EINVAL; 2878de73115aSClaudio Takahasi 2879de73115aSClaudio Takahasi cmd_len = __le16_to_cpu(cmd->len); 2880de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 2881de73115aSClaudio Takahasi return -EPROTO; 2882de73115aSClaudio Takahasi 2883de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 2884de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 2885de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 2886de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 2887de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 2888de73115aSClaudio Takahasi 2889de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 2890de73115aSClaudio Takahasi min, max, latency, to_multiplier); 2891de73115aSClaudio Takahasi 2892de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 28932ce603ebSClaudio Takahasi 28942ce603ebSClaudio Takahasi err = l2cap_check_conn_param(min, max, latency, to_multiplier); 28952ce603ebSClaudio Takahasi if (err) 2896de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 2897de73115aSClaudio Takahasi else 2898de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 2899de73115aSClaudio Takahasi 2900de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 2901de73115aSClaudio Takahasi sizeof(rsp), &rsp); 2902de73115aSClaudio Takahasi 29032ce603ebSClaudio Takahasi if (!err) 29042ce603ebSClaudio Takahasi hci_le_conn_update(hcon, min, max, latency, to_multiplier); 29052ce603ebSClaudio Takahasi 2906de73115aSClaudio Takahasi return 0; 2907de73115aSClaudio Takahasi } 2908de73115aSClaudio Takahasi 29093300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 29103300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 29113300d9a9SClaudio Takahasi { 29123300d9a9SClaudio Takahasi int err = 0; 29133300d9a9SClaudio Takahasi 29143300d9a9SClaudio Takahasi switch (cmd->code) { 29153300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 29163300d9a9SClaudio Takahasi l2cap_command_rej(conn, cmd, data); 29173300d9a9SClaudio Takahasi break; 29183300d9a9SClaudio Takahasi 29193300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 29203300d9a9SClaudio Takahasi err = l2cap_connect_req(conn, cmd, data); 29213300d9a9SClaudio Takahasi break; 29223300d9a9SClaudio Takahasi 29233300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 29243300d9a9SClaudio Takahasi err = l2cap_connect_rsp(conn, cmd, data); 29253300d9a9SClaudio Takahasi break; 29263300d9a9SClaudio Takahasi 29273300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 29283300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 29293300d9a9SClaudio Takahasi break; 29303300d9a9SClaudio Takahasi 29313300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 29323300d9a9SClaudio Takahasi err = l2cap_config_rsp(conn, cmd, data); 29333300d9a9SClaudio Takahasi break; 29343300d9a9SClaudio Takahasi 29353300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 29363300d9a9SClaudio Takahasi err = l2cap_disconnect_req(conn, cmd, data); 29373300d9a9SClaudio Takahasi break; 29383300d9a9SClaudio Takahasi 29393300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 29403300d9a9SClaudio Takahasi err = l2cap_disconnect_rsp(conn, cmd, data); 29413300d9a9SClaudio Takahasi break; 29423300d9a9SClaudio Takahasi 29433300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 29443300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 29453300d9a9SClaudio Takahasi break; 29463300d9a9SClaudio Takahasi 29473300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 29483300d9a9SClaudio Takahasi break; 29493300d9a9SClaudio Takahasi 29503300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 29513300d9a9SClaudio Takahasi err = l2cap_information_req(conn, cmd, data); 29523300d9a9SClaudio Takahasi break; 29533300d9a9SClaudio Takahasi 29543300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 29553300d9a9SClaudio Takahasi err = l2cap_information_rsp(conn, cmd, data); 29563300d9a9SClaudio Takahasi break; 29573300d9a9SClaudio Takahasi 29583300d9a9SClaudio Takahasi default: 29593300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 29603300d9a9SClaudio Takahasi err = -EINVAL; 29613300d9a9SClaudio Takahasi break; 29623300d9a9SClaudio Takahasi } 29633300d9a9SClaudio Takahasi 29643300d9a9SClaudio Takahasi return err; 29653300d9a9SClaudio Takahasi } 29663300d9a9SClaudio Takahasi 29673300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 29683300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 29693300d9a9SClaudio Takahasi { 29703300d9a9SClaudio Takahasi switch (cmd->code) { 29713300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 29723300d9a9SClaudio Takahasi return 0; 29733300d9a9SClaudio Takahasi 29743300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 2975de73115aSClaudio Takahasi return l2cap_conn_param_update_req(conn, cmd, data); 29763300d9a9SClaudio Takahasi 29773300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 29783300d9a9SClaudio Takahasi return 0; 29793300d9a9SClaudio Takahasi 29803300d9a9SClaudio Takahasi default: 29813300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 29823300d9a9SClaudio Takahasi return -EINVAL; 29833300d9a9SClaudio Takahasi } 29843300d9a9SClaudio Takahasi } 29853300d9a9SClaudio Takahasi 29863300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 29873300d9a9SClaudio Takahasi struct sk_buff *skb) 29880a708f8fSGustavo F. Padovan { 29890a708f8fSGustavo F. Padovan u8 *data = skb->data; 29900a708f8fSGustavo F. Padovan int len = skb->len; 29910a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 29923300d9a9SClaudio Takahasi int err; 29930a708f8fSGustavo F. Padovan 29940a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 29950a708f8fSGustavo F. Padovan 29960a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 29970a708f8fSGustavo F. Padovan u16 cmd_len; 29980a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 29990a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 30000a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 30010a708f8fSGustavo F. Padovan 30020a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 30030a708f8fSGustavo F. Padovan 30040a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); 30050a708f8fSGustavo F. Padovan 30060a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 30070a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 30080a708f8fSGustavo F. Padovan break; 30090a708f8fSGustavo F. Padovan } 30100a708f8fSGustavo F. Padovan 30113300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 30123300d9a9SClaudio Takahasi err = l2cap_le_sig_cmd(conn, &cmd, data); 30133300d9a9SClaudio Takahasi else 30143300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 30150a708f8fSGustavo F. Padovan 30160a708f8fSGustavo F. Padovan if (err) { 30170a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 30182c6d1a2eSGustavo F. Padovan 30192c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 30200a708f8fSGustavo F. Padovan 30210a708f8fSGustavo F. Padovan /* FIXME: Map err to a valid reason */ 30220a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0); 30230a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); 30240a708f8fSGustavo F. Padovan } 30250a708f8fSGustavo F. Padovan 30260a708f8fSGustavo F. Padovan data += cmd_len; 30270a708f8fSGustavo F. Padovan len -= cmd_len; 30280a708f8fSGustavo F. Padovan } 30290a708f8fSGustavo F. Padovan 30300a708f8fSGustavo F. Padovan kfree_skb(skb); 30310a708f8fSGustavo F. Padovan } 30320a708f8fSGustavo F. Padovan 303347d1ec61SGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) 30340a708f8fSGustavo F. Padovan { 30350a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 30360a708f8fSGustavo F. Padovan int hdr_size = L2CAP_HDR_SIZE + 2; 30370a708f8fSGustavo F. Padovan 303847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 30390a708f8fSGustavo F. Padovan skb_trim(skb, skb->len - 2); 30400a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 30410a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 30420a708f8fSGustavo F. Padovan 30430a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 30440a708f8fSGustavo F. Padovan return -EBADMSG; 30450a708f8fSGustavo F. Padovan } 30460a708f8fSGustavo F. Padovan return 0; 30470a708f8fSGustavo F. Padovan } 30480a708f8fSGustavo F. Padovan 3049525cd185SGustavo F. Padovan static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) 30500a708f8fSGustavo F. Padovan { 30510a708f8fSGustavo F. Padovan u16 control = 0; 30520a708f8fSGustavo F. Padovan 30536a026610SGustavo F. Padovan chan->frames_sent = 0; 30540a708f8fSGustavo F. Padovan 305542e5c802SGustavo F. Padovan control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 30560a708f8fSGustavo F. Padovan 3057525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 30580a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 3059525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 3060525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 30610a708f8fSGustavo F. Padovan } 30620a708f8fSGustavo F. Padovan 3063525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY) 3064525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 30650a708f8fSGustavo F. Padovan 3066525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 30670a708f8fSGustavo F. Padovan 3068525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) && 30696a026610SGustavo F. Padovan chan->frames_sent == 0) { 30700a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 3071525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 30720a708f8fSGustavo F. Padovan } 30730a708f8fSGustavo F. Padovan } 30740a708f8fSGustavo F. Padovan 307542e5c802SGustavo F. Padovan static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) 30760a708f8fSGustavo F. Padovan { 30770a708f8fSGustavo F. Padovan struct sk_buff *next_skb; 30780a708f8fSGustavo F. Padovan int tx_seq_offset, next_tx_seq_offset; 30790a708f8fSGustavo F. Padovan 30800a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 30810a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 30820a708f8fSGustavo F. Padovan 3083f1c6775bSGustavo F. Padovan next_skb = skb_peek(&chan->srej_q); 30840a708f8fSGustavo F. Padovan if (!next_skb) { 3085f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->srej_q, skb); 30860a708f8fSGustavo F. Padovan return 0; 30870a708f8fSGustavo F. Padovan } 30880a708f8fSGustavo F. Padovan 308942e5c802SGustavo F. Padovan tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; 30900a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 30910a708f8fSGustavo F. Padovan tx_seq_offset += 64; 30920a708f8fSGustavo F. Padovan 30930a708f8fSGustavo F. Padovan do { 30940a708f8fSGustavo F. Padovan if (bt_cb(next_skb)->tx_seq == tx_seq) 30950a708f8fSGustavo F. Padovan return -EINVAL; 30960a708f8fSGustavo F. Padovan 30970a708f8fSGustavo F. Padovan next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - 309842e5c802SGustavo F. Padovan chan->buffer_seq) % 64; 30990a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 31000a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 31010a708f8fSGustavo F. Padovan 31020a708f8fSGustavo F. Padovan if (next_tx_seq_offset > tx_seq_offset) { 3103f1c6775bSGustavo F. Padovan __skb_queue_before(&chan->srej_q, next_skb, skb); 31040a708f8fSGustavo F. Padovan return 0; 31050a708f8fSGustavo F. Padovan } 31060a708f8fSGustavo F. Padovan 3107f1c6775bSGustavo F. Padovan if (skb_queue_is_last(&chan->srej_q, next_skb)) 31080a708f8fSGustavo F. Padovan break; 31090a708f8fSGustavo F. Padovan 3110f1c6775bSGustavo F. Padovan } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); 31110a708f8fSGustavo F. Padovan 3112f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->srej_q, skb); 31130a708f8fSGustavo F. Padovan 31140a708f8fSGustavo F. Padovan return 0; 31150a708f8fSGustavo F. Padovan } 31160a708f8fSGustavo F. Padovan 3117525cd185SGustavo F. Padovan static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) 31180a708f8fSGustavo F. Padovan { 31190a708f8fSGustavo F. Padovan struct sk_buff *_skb; 31200a708f8fSGustavo F. Padovan int err; 31210a708f8fSGustavo F. Padovan 31220a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 31230a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 3124525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) 31250a708f8fSGustavo F. Padovan goto drop; 31260a708f8fSGustavo F. Padovan 3127224f8af0SRuiyi Zhang return sock_queue_rcv_skb(chan->sk, skb); 31280a708f8fSGustavo F. Padovan 31290a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 3130525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) 31310a708f8fSGustavo F. Padovan goto drop; 31320a708f8fSGustavo F. Padovan 31336f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 31340a708f8fSGustavo F. Padovan 31350c1bc5c6SGustavo F. Padovan if (chan->sdu_len > chan->imtu) 31360a708f8fSGustavo F. Padovan goto disconnect; 31370a708f8fSGustavo F. Padovan 31386f61fd47SGustavo F. Padovan chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); 31396f61fd47SGustavo F. Padovan if (!chan->sdu) 31400a708f8fSGustavo F. Padovan return -ENOMEM; 31410a708f8fSGustavo F. Padovan 31420a708f8fSGustavo F. Padovan /* pull sdu_len bytes only after alloc, because of Local Busy 31430a708f8fSGustavo F. Padovan * condition we have to be sure that this will be executed 31440a708f8fSGustavo F. Padovan * only once, i.e., when alloc does not fail */ 31450a708f8fSGustavo F. Padovan skb_pull(skb, 2); 31460a708f8fSGustavo F. Padovan 31476f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 31480a708f8fSGustavo F. Padovan 3149525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_SDU; 31506f61fd47SGustavo F. Padovan chan->partial_sdu_len = skb->len; 31510a708f8fSGustavo F. Padovan break; 31520a708f8fSGustavo F. Padovan 31530a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 3154525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 31550a708f8fSGustavo F. Padovan goto disconnect; 31560a708f8fSGustavo F. Padovan 31576f61fd47SGustavo F. Padovan if (!chan->sdu) 31580a708f8fSGustavo F. Padovan goto disconnect; 31590a708f8fSGustavo F. Padovan 31606f61fd47SGustavo F. Padovan chan->partial_sdu_len += skb->len; 31616f61fd47SGustavo F. Padovan if (chan->partial_sdu_len > chan->sdu_len) 31620a708f8fSGustavo F. Padovan goto drop; 31630a708f8fSGustavo F. Padovan 31646f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 31650a708f8fSGustavo F. Padovan 31660a708f8fSGustavo F. Padovan break; 31670a708f8fSGustavo F. Padovan 31680a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 3169525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 31700a708f8fSGustavo F. Padovan goto disconnect; 31710a708f8fSGustavo F. Padovan 31726f61fd47SGustavo F. Padovan if (!chan->sdu) 31730a708f8fSGustavo F. Padovan goto disconnect; 31740a708f8fSGustavo F. Padovan 3175525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) { 31766f61fd47SGustavo F. Padovan chan->partial_sdu_len += skb->len; 31770a708f8fSGustavo F. Padovan 31780c1bc5c6SGustavo F. Padovan if (chan->partial_sdu_len > chan->imtu) 31790a708f8fSGustavo F. Padovan goto drop; 31800a708f8fSGustavo F. Padovan 31816f61fd47SGustavo F. Padovan if (chan->partial_sdu_len != chan->sdu_len) 31820a708f8fSGustavo F. Padovan goto drop; 31830a708f8fSGustavo F. Padovan 31846f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 31850a708f8fSGustavo F. Padovan } 31860a708f8fSGustavo F. Padovan 31876f61fd47SGustavo F. Padovan _skb = skb_clone(chan->sdu, GFP_ATOMIC); 31880a708f8fSGustavo F. Padovan if (!_skb) { 3189525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_RETRY; 31900a708f8fSGustavo F. Padovan return -ENOMEM; 31910a708f8fSGustavo F. Padovan } 31920a708f8fSGustavo F. Padovan 3193525cd185SGustavo F. Padovan err = sock_queue_rcv_skb(chan->sk, _skb); 31940a708f8fSGustavo F. Padovan if (err < 0) { 31950a708f8fSGustavo F. Padovan kfree_skb(_skb); 3196525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_RETRY; 31970a708f8fSGustavo F. Padovan return err; 31980a708f8fSGustavo F. Padovan } 31990a708f8fSGustavo F. Padovan 3200525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SAR_RETRY; 3201525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SAR_SDU; 32020a708f8fSGustavo F. Padovan 32036f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 32040a708f8fSGustavo F. Padovan break; 32050a708f8fSGustavo F. Padovan } 32060a708f8fSGustavo F. Padovan 32070a708f8fSGustavo F. Padovan kfree_skb(skb); 32080a708f8fSGustavo F. Padovan return 0; 32090a708f8fSGustavo F. Padovan 32100a708f8fSGustavo F. Padovan drop: 32116f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 32126f61fd47SGustavo F. Padovan chan->sdu = NULL; 32130a708f8fSGustavo F. Padovan 32140a708f8fSGustavo F. Padovan disconnect: 32158c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 32160a708f8fSGustavo F. Padovan kfree_skb(skb); 32170a708f8fSGustavo F. Padovan return 0; 32180a708f8fSGustavo F. Padovan } 32190a708f8fSGustavo F. Padovan 3220525cd185SGustavo F. Padovan static int l2cap_try_push_rx_skb(struct l2cap_chan *chan) 32210a708f8fSGustavo F. Padovan { 32220a708f8fSGustavo F. Padovan struct sk_buff *skb; 32230a708f8fSGustavo F. Padovan u16 control; 32240a708f8fSGustavo F. Padovan int err; 32250a708f8fSGustavo F. Padovan 3226f1c6775bSGustavo F. Padovan while ((skb = skb_dequeue(&chan->busy_q))) { 32270a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 3228525cd185SGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(chan, skb, control); 32290a708f8fSGustavo F. Padovan if (err < 0) { 3230f1c6775bSGustavo F. Padovan skb_queue_head(&chan->busy_q, skb); 32310a708f8fSGustavo F. Padovan return -EBUSY; 32320a708f8fSGustavo F. Padovan } 32330a708f8fSGustavo F. Padovan 323442e5c802SGustavo F. Padovan chan->buffer_seq = (chan->buffer_seq + 1) % 64; 32350a708f8fSGustavo F. Padovan } 32360a708f8fSGustavo F. Padovan 3237525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_RNR_SENT)) 32380a708f8fSGustavo F. Padovan goto done; 32390a708f8fSGustavo F. Padovan 324042e5c802SGustavo F. Padovan control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 32410a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; 3242525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 32436a026610SGustavo F. Padovan chan->retry_count = 1; 32440a708f8fSGustavo F. Padovan 3245e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 32460a708f8fSGustavo F. Padovan __mod_monitor_timer(); 32470a708f8fSGustavo F. Padovan 3248525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_WAIT_F; 32490a708f8fSGustavo F. Padovan 32500a708f8fSGustavo F. Padovan done: 3251525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; 3252525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_RNR_SENT; 32530a708f8fSGustavo F. Padovan 325449208c9cSGustavo F. Padovan BT_DBG("chan %p, Exit local busy", chan); 32550a708f8fSGustavo F. Padovan 32560a708f8fSGustavo F. Padovan return 0; 32570a708f8fSGustavo F. Padovan } 32580a708f8fSGustavo F. Padovan 32590a708f8fSGustavo F. Padovan static void l2cap_busy_work(struct work_struct *work) 32600a708f8fSGustavo F. Padovan { 32610a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 3262311bb895SGustavo F. Padovan struct l2cap_chan *chan = 3263311bb895SGustavo F. Padovan container_of(work, struct l2cap_chan, busy_work); 3264311bb895SGustavo F. Padovan struct sock *sk = chan->sk; 32650a708f8fSGustavo F. Padovan int n_tries = 0, timeo = HZ/5, err; 32660a708f8fSGustavo F. Padovan struct sk_buff *skb; 32670a708f8fSGustavo F. Padovan 32680a708f8fSGustavo F. Padovan lock_sock(sk); 32690a708f8fSGustavo F. Padovan 32700a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 3271311bb895SGustavo F. Padovan while ((skb = skb_peek(&chan->busy_q))) { 32720a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 32730a708f8fSGustavo F. Padovan 32740a708f8fSGustavo F. Padovan if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { 32750a708f8fSGustavo F. Padovan err = -EBUSY; 32768c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, EBUSY); 32770a708f8fSGustavo F. Padovan break; 32780a708f8fSGustavo F. Padovan } 32790a708f8fSGustavo F. Padovan 32800a708f8fSGustavo F. Padovan if (!timeo) 32810a708f8fSGustavo F. Padovan timeo = HZ/5; 32820a708f8fSGustavo F. Padovan 32830a708f8fSGustavo F. Padovan if (signal_pending(current)) { 32840a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 32850a708f8fSGustavo F. Padovan break; 32860a708f8fSGustavo F. Padovan } 32870a708f8fSGustavo F. Padovan 32880a708f8fSGustavo F. Padovan release_sock(sk); 32890a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 32900a708f8fSGustavo F. Padovan lock_sock(sk); 32910a708f8fSGustavo F. Padovan 32920a708f8fSGustavo F. Padovan err = sock_error(sk); 32930a708f8fSGustavo F. Padovan if (err) 32940a708f8fSGustavo F. Padovan break; 32950a708f8fSGustavo F. Padovan 3296311bb895SGustavo F. Padovan if (l2cap_try_push_rx_skb(chan) == 0) 32970a708f8fSGustavo F. Padovan break; 32980a708f8fSGustavo F. Padovan } 32990a708f8fSGustavo F. Padovan 33000a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 33010a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 33020a708f8fSGustavo F. Padovan 33030a708f8fSGustavo F. Padovan release_sock(sk); 33040a708f8fSGustavo F. Padovan } 33050a708f8fSGustavo F. Padovan 3306525cd185SGustavo F. Padovan static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) 33070a708f8fSGustavo F. Padovan { 33080a708f8fSGustavo F. Padovan int sctrl, err; 33090a708f8fSGustavo F. Padovan 3310525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 33110a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 3312f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->busy_q, skb); 3313525cd185SGustavo F. Padovan return l2cap_try_push_rx_skb(chan); 33140a708f8fSGustavo F. Padovan 33150a708f8fSGustavo F. Padovan 33160a708f8fSGustavo F. Padovan } 33170a708f8fSGustavo F. Padovan 3318525cd185SGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(chan, skb, control); 33190a708f8fSGustavo F. Padovan if (err >= 0) { 332042e5c802SGustavo F. Padovan chan->buffer_seq = (chan->buffer_seq + 1) % 64; 33210a708f8fSGustavo F. Padovan return err; 33220a708f8fSGustavo F. Padovan } 33230a708f8fSGustavo F. Padovan 33240a708f8fSGustavo F. Padovan /* Busy Condition */ 3325311bb895SGustavo F. Padovan BT_DBG("chan %p, Enter local busy", chan); 33260a708f8fSGustavo F. Padovan 3327525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_LOCAL_BUSY; 33280a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 3329f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->busy_q, skb); 33300a708f8fSGustavo F. Padovan 333142e5c802SGustavo F. Padovan sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 33320a708f8fSGustavo F. Padovan sctrl |= L2CAP_SUPER_RCV_NOT_READY; 3333525cd185SGustavo F. Padovan l2cap_send_sframe(chan, sctrl); 33340a708f8fSGustavo F. Padovan 3335525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 33360a708f8fSGustavo F. Padovan 3337e92c8e70SGustavo F. Padovan del_timer(&chan->ack_timer); 33380a708f8fSGustavo F. Padovan 3339311bb895SGustavo F. Padovan queue_work(_busy_wq, &chan->busy_work); 33400a708f8fSGustavo F. Padovan 33410a708f8fSGustavo F. Padovan return err; 33420a708f8fSGustavo F. Padovan } 33430a708f8fSGustavo F. Padovan 3344525cd185SGustavo F. Padovan static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) 33450a708f8fSGustavo F. Padovan { 33460a708f8fSGustavo F. Padovan struct sk_buff *_skb; 33470a708f8fSGustavo F. Padovan int err = -EINVAL; 33480a708f8fSGustavo F. Padovan 33490a708f8fSGustavo F. Padovan /* 33500a708f8fSGustavo F. Padovan * TODO: We have to notify the userland if some data is lost with the 33510a708f8fSGustavo F. Padovan * Streaming Mode. 33520a708f8fSGustavo F. Padovan */ 33530a708f8fSGustavo F. Padovan 33540a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 33550a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 3356525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) { 33576f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 33580a708f8fSGustavo F. Padovan break; 33590a708f8fSGustavo F. Padovan } 33600a708f8fSGustavo F. Padovan 3361525cd185SGustavo F. Padovan err = sock_queue_rcv_skb(chan->sk, skb); 33620a708f8fSGustavo F. Padovan if (!err) 33630a708f8fSGustavo F. Padovan return 0; 33640a708f8fSGustavo F. Padovan 33650a708f8fSGustavo F. Padovan break; 33660a708f8fSGustavo F. Padovan 33670a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 3368525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) { 33696f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 33700a708f8fSGustavo F. Padovan break; 33710a708f8fSGustavo F. Padovan } 33720a708f8fSGustavo F. Padovan 33736f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 33740a708f8fSGustavo F. Padovan skb_pull(skb, 2); 33750a708f8fSGustavo F. Padovan 33760c1bc5c6SGustavo F. Padovan if (chan->sdu_len > chan->imtu) { 33770a708f8fSGustavo F. Padovan err = -EMSGSIZE; 33780a708f8fSGustavo F. Padovan break; 33790a708f8fSGustavo F. Padovan } 33800a708f8fSGustavo F. Padovan 33816f61fd47SGustavo F. Padovan chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); 33826f61fd47SGustavo F. Padovan if (!chan->sdu) { 33830a708f8fSGustavo F. Padovan err = -ENOMEM; 33840a708f8fSGustavo F. Padovan break; 33850a708f8fSGustavo F. Padovan } 33860a708f8fSGustavo F. Padovan 33876f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 33880a708f8fSGustavo F. Padovan 3389525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_SDU; 33906f61fd47SGustavo F. Padovan chan->partial_sdu_len = skb->len; 33910a708f8fSGustavo F. Padovan err = 0; 33920a708f8fSGustavo F. Padovan break; 33930a708f8fSGustavo F. Padovan 33940a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 3395525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 33960a708f8fSGustavo F. Padovan break; 33970a708f8fSGustavo F. Padovan 33986f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 33990a708f8fSGustavo F. Padovan 34006f61fd47SGustavo F. Padovan chan->partial_sdu_len += skb->len; 34016f61fd47SGustavo F. Padovan if (chan->partial_sdu_len > chan->sdu_len) 34026f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 34030a708f8fSGustavo F. Padovan else 34040a708f8fSGustavo F. Padovan err = 0; 34050a708f8fSGustavo F. Padovan 34060a708f8fSGustavo F. Padovan break; 34070a708f8fSGustavo F. Padovan 34080a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 3409525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 34100a708f8fSGustavo F. Padovan break; 34110a708f8fSGustavo F. Padovan 34126f61fd47SGustavo F. Padovan memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); 34130a708f8fSGustavo F. Padovan 3414525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SAR_SDU; 34156f61fd47SGustavo F. Padovan chan->partial_sdu_len += skb->len; 34160a708f8fSGustavo F. Padovan 34170c1bc5c6SGustavo F. Padovan if (chan->partial_sdu_len > chan->imtu) 34180a708f8fSGustavo F. Padovan goto drop; 34190a708f8fSGustavo F. Padovan 34206f61fd47SGustavo F. Padovan if (chan->partial_sdu_len == chan->sdu_len) { 34216f61fd47SGustavo F. Padovan _skb = skb_clone(chan->sdu, GFP_ATOMIC); 3422525cd185SGustavo F. Padovan err = sock_queue_rcv_skb(chan->sk, _skb); 34230a708f8fSGustavo F. Padovan if (err < 0) 34240a708f8fSGustavo F. Padovan kfree_skb(_skb); 34250a708f8fSGustavo F. Padovan } 34260a708f8fSGustavo F. Padovan err = 0; 34270a708f8fSGustavo F. Padovan 34280a708f8fSGustavo F. Padovan drop: 34296f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 34300a708f8fSGustavo F. Padovan break; 34310a708f8fSGustavo F. Padovan } 34320a708f8fSGustavo F. Padovan 34330a708f8fSGustavo F. Padovan kfree_skb(skb); 34340a708f8fSGustavo F. Padovan return err; 34350a708f8fSGustavo F. Padovan } 34360a708f8fSGustavo F. Padovan 3437525cd185SGustavo F. Padovan static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) 34380a708f8fSGustavo F. Padovan { 34390a708f8fSGustavo F. Padovan struct sk_buff *skb; 34400a708f8fSGustavo F. Padovan u16 control; 34410a708f8fSGustavo F. Padovan 3442f1c6775bSGustavo F. Padovan while ((skb = skb_peek(&chan->srej_q))) { 34430a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq != tx_seq) 34440a708f8fSGustavo F. Padovan break; 34450a708f8fSGustavo F. Padovan 3446f1c6775bSGustavo F. Padovan skb = skb_dequeue(&chan->srej_q); 34470a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 3448525cd185SGustavo F. Padovan l2cap_ertm_reassembly_sdu(chan, skb, control); 344942e5c802SGustavo F. Padovan chan->buffer_seq_srej = 345042e5c802SGustavo F. Padovan (chan->buffer_seq_srej + 1) % 64; 34510a708f8fSGustavo F. Padovan tx_seq = (tx_seq + 1) % 64; 34520a708f8fSGustavo F. Padovan } 34530a708f8fSGustavo F. Padovan } 34540a708f8fSGustavo F. Padovan 3455525cd185SGustavo F. Padovan static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) 34560a708f8fSGustavo F. Padovan { 34570a708f8fSGustavo F. Padovan struct srej_list *l, *tmp; 34580a708f8fSGustavo F. Padovan u16 control; 34590a708f8fSGustavo F. Padovan 346039d5a3eeSGustavo F. Padovan list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { 34610a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 34620a708f8fSGustavo F. Padovan list_del(&l->list); 34630a708f8fSGustavo F. Padovan kfree(l); 34640a708f8fSGustavo F. Padovan return; 34650a708f8fSGustavo F. Padovan } 34660a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 34670a708f8fSGustavo F. Padovan control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 3468525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 34690a708f8fSGustavo F. Padovan list_del(&l->list); 347039d5a3eeSGustavo F. Padovan list_add_tail(&l->list, &chan->srej_l); 34710a708f8fSGustavo F. Padovan } 34720a708f8fSGustavo F. Padovan } 34730a708f8fSGustavo F. Padovan 3474525cd185SGustavo F. Padovan static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) 34750a708f8fSGustavo F. Padovan { 34760a708f8fSGustavo F. Padovan struct srej_list *new; 34770a708f8fSGustavo F. Padovan u16 control; 34780a708f8fSGustavo F. Padovan 347942e5c802SGustavo F. Padovan while (tx_seq != chan->expected_tx_seq) { 34800a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 348142e5c802SGustavo F. Padovan control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 3482525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 34830a708f8fSGustavo F. Padovan 34840a708f8fSGustavo F. Padovan new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); 348542e5c802SGustavo F. Padovan new->tx_seq = chan->expected_tx_seq; 348642e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 348739d5a3eeSGustavo F. Padovan list_add_tail(&new->list, &chan->srej_l); 34880a708f8fSGustavo F. Padovan } 348942e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 34900a708f8fSGustavo F. Padovan } 34910a708f8fSGustavo F. Padovan 3492525cd185SGustavo F. Padovan static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) 34930a708f8fSGustavo F. Padovan { 34940a708f8fSGustavo F. Padovan u8 tx_seq = __get_txseq(rx_control); 34950a708f8fSGustavo F. Padovan u8 req_seq = __get_reqseq(rx_control); 34960a708f8fSGustavo F. Padovan u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; 34970a708f8fSGustavo F. Padovan int tx_seq_offset, expected_tx_seq_offset; 349847d1ec61SGustavo F. Padovan int num_to_ack = (chan->tx_win/6) + 1; 34990a708f8fSGustavo F. Padovan int err = 0; 35000a708f8fSGustavo F. Padovan 3501525cd185SGustavo F. Padovan BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, 3502525cd185SGustavo F. Padovan tx_seq, rx_control); 35030a708f8fSGustavo F. Padovan 35040a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 3505525cd185SGustavo F. Padovan chan->conn_state & L2CAP_CONN_WAIT_F) { 3506e92c8e70SGustavo F. Padovan del_timer(&chan->monitor_timer); 35076a026610SGustavo F. Padovan if (chan->unacked_frames > 0) 35080a708f8fSGustavo F. Padovan __mod_retrans_timer(); 3509525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_WAIT_F; 35100a708f8fSGustavo F. Padovan } 35110a708f8fSGustavo F. Padovan 351242e5c802SGustavo F. Padovan chan->expected_ack_seq = req_seq; 351342e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 35140a708f8fSGustavo F. Padovan 351542e5c802SGustavo F. Padovan if (tx_seq == chan->expected_tx_seq) 35160a708f8fSGustavo F. Padovan goto expected; 35170a708f8fSGustavo F. Padovan 351842e5c802SGustavo F. Padovan tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; 35190a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 35200a708f8fSGustavo F. Padovan tx_seq_offset += 64; 35210a708f8fSGustavo F. Padovan 35220a708f8fSGustavo F. Padovan /* invalid tx_seq */ 352347d1ec61SGustavo F. Padovan if (tx_seq_offset >= chan->tx_win) { 35248c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 35250a708f8fSGustavo F. Padovan goto drop; 35260a708f8fSGustavo F. Padovan } 35270a708f8fSGustavo F. Padovan 3528e6949280SMat Martineau if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) 35290a708f8fSGustavo F. Padovan goto drop; 35300a708f8fSGustavo F. Padovan 3531525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { 35320a708f8fSGustavo F. Padovan struct srej_list *first; 35330a708f8fSGustavo F. Padovan 353439d5a3eeSGustavo F. Padovan first = list_first_entry(&chan->srej_l, 35350a708f8fSGustavo F. Padovan struct srej_list, list); 35360a708f8fSGustavo F. Padovan if (tx_seq == first->tx_seq) { 353742e5c802SGustavo F. Padovan l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); 3538525cd185SGustavo F. Padovan l2cap_check_srej_gap(chan, tx_seq); 35390a708f8fSGustavo F. Padovan 35400a708f8fSGustavo F. Padovan list_del(&first->list); 35410a708f8fSGustavo F. Padovan kfree(first); 35420a708f8fSGustavo F. Padovan 354339d5a3eeSGustavo F. Padovan if (list_empty(&chan->srej_l)) { 354442e5c802SGustavo F. Padovan chan->buffer_seq = chan->buffer_seq_srej; 3545525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SREJ_SENT; 3546525cd185SGustavo F. Padovan l2cap_send_ack(chan); 354749208c9cSGustavo F. Padovan BT_DBG("chan %p, Exit SREJ_SENT", chan); 35480a708f8fSGustavo F. Padovan } 35490a708f8fSGustavo F. Padovan } else { 35500a708f8fSGustavo F. Padovan struct srej_list *l; 35510a708f8fSGustavo F. Padovan 35520a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 355342e5c802SGustavo F. Padovan if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) 35540a708f8fSGustavo F. Padovan goto drop; 35550a708f8fSGustavo F. Padovan 355639d5a3eeSGustavo F. Padovan list_for_each_entry(l, &chan->srej_l, list) { 35570a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 3558525cd185SGustavo F. Padovan l2cap_resend_srejframe(chan, tx_seq); 35590a708f8fSGustavo F. Padovan return 0; 35600a708f8fSGustavo F. Padovan } 35610a708f8fSGustavo F. Padovan } 3562525cd185SGustavo F. Padovan l2cap_send_srejframe(chan, tx_seq); 35630a708f8fSGustavo F. Padovan } 35640a708f8fSGustavo F. Padovan } else { 35650a708f8fSGustavo F. Padovan expected_tx_seq_offset = 356642e5c802SGustavo F. Padovan (chan->expected_tx_seq - chan->buffer_seq) % 64; 35670a708f8fSGustavo F. Padovan if (expected_tx_seq_offset < 0) 35680a708f8fSGustavo F. Padovan expected_tx_seq_offset += 64; 35690a708f8fSGustavo F. Padovan 35700a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 35710a708f8fSGustavo F. Padovan if (tx_seq_offset < expected_tx_seq_offset) 35720a708f8fSGustavo F. Padovan goto drop; 35730a708f8fSGustavo F. Padovan 3574525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SREJ_SENT; 35750a708f8fSGustavo F. Padovan 357649208c9cSGustavo F. Padovan BT_DBG("chan %p, Enter SREJ", chan); 35770a708f8fSGustavo F. Padovan 357839d5a3eeSGustavo F. Padovan INIT_LIST_HEAD(&chan->srej_l); 357942e5c802SGustavo F. Padovan chan->buffer_seq_srej = chan->buffer_seq; 35800a708f8fSGustavo F. Padovan 3581f1c6775bSGustavo F. Padovan __skb_queue_head_init(&chan->srej_q); 3582f1c6775bSGustavo F. Padovan __skb_queue_head_init(&chan->busy_q); 358342e5c802SGustavo F. Padovan l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); 35840a708f8fSGustavo F. Padovan 3585525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_PBIT; 35860a708f8fSGustavo F. Padovan 3587525cd185SGustavo F. Padovan l2cap_send_srejframe(chan, tx_seq); 35880a708f8fSGustavo F. Padovan 3589e92c8e70SGustavo F. Padovan del_timer(&chan->ack_timer); 35900a708f8fSGustavo F. Padovan } 35910a708f8fSGustavo F. Padovan return 0; 35920a708f8fSGustavo F. Padovan 35930a708f8fSGustavo F. Padovan expected: 359442e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 35950a708f8fSGustavo F. Padovan 3596525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { 35970a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 35980a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 3599f1c6775bSGustavo F. Padovan __skb_queue_tail(&chan->srej_q, skb); 36000a708f8fSGustavo F. Padovan return 0; 36010a708f8fSGustavo F. Padovan } 36020a708f8fSGustavo F. Padovan 3603525cd185SGustavo F. Padovan err = l2cap_push_rx_skb(chan, skb, rx_control); 36040a708f8fSGustavo F. Padovan if (err < 0) 36050a708f8fSGustavo F. Padovan return 0; 36060a708f8fSGustavo F. Padovan 36070a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 3608525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REJ_ACT) 3609525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REJ_ACT; 36100a708f8fSGustavo F. Padovan else 3611525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 36120a708f8fSGustavo F. Padovan } 36130a708f8fSGustavo F. Padovan 36140a708f8fSGustavo F. Padovan __mod_ack_timer(); 36150a708f8fSGustavo F. Padovan 36166a026610SGustavo F. Padovan chan->num_acked = (chan->num_acked + 1) % num_to_ack; 36176a026610SGustavo F. Padovan if (chan->num_acked == num_to_ack - 1) 3618525cd185SGustavo F. Padovan l2cap_send_ack(chan); 36190a708f8fSGustavo F. Padovan 36200a708f8fSGustavo F. Padovan return 0; 36210a708f8fSGustavo F. Padovan 36220a708f8fSGustavo F. Padovan drop: 36230a708f8fSGustavo F. Padovan kfree_skb(skb); 36240a708f8fSGustavo F. Padovan return 0; 36250a708f8fSGustavo F. Padovan } 36260a708f8fSGustavo F. Padovan 3627525cd185SGustavo F. Padovan static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) 36280a708f8fSGustavo F. Padovan { 362949208c9cSGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), 36300a708f8fSGustavo F. Padovan rx_control); 36310a708f8fSGustavo F. Padovan 363242e5c802SGustavo F. Padovan chan->expected_ack_seq = __get_reqseq(rx_control); 363342e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 36340a708f8fSGustavo F. Padovan 36350a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 3636525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_FBIT; 3637525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { 3638525cd185SGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && 36396a026610SGustavo F. Padovan (chan->unacked_frames > 0)) 36400a708f8fSGustavo F. Padovan __mod_retrans_timer(); 36410a708f8fSGustavo F. Padovan 3642525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 3643525cd185SGustavo F. Padovan l2cap_send_srejtail(chan); 36440a708f8fSGustavo F. Padovan } else { 3645525cd185SGustavo F. Padovan l2cap_send_i_or_rr_or_rnr(chan); 36460a708f8fSGustavo F. Padovan } 36470a708f8fSGustavo F. Padovan 36480a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 3649525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 36500a708f8fSGustavo F. Padovan 3651525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REJ_ACT) 3652525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REJ_ACT; 36530a708f8fSGustavo F. Padovan else 3654525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 36550a708f8fSGustavo F. Padovan 36560a708f8fSGustavo F. Padovan } else { 3657525cd185SGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && 36586a026610SGustavo F. Padovan (chan->unacked_frames > 0)) 36590a708f8fSGustavo F. Padovan __mod_retrans_timer(); 36600a708f8fSGustavo F. Padovan 3661525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 3662525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) 3663525cd185SGustavo F. Padovan l2cap_send_ack(chan); 36640a708f8fSGustavo F. Padovan else 3665525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 36660a708f8fSGustavo F. Padovan } 36670a708f8fSGustavo F. Padovan } 36680a708f8fSGustavo F. Padovan 3669525cd185SGustavo F. Padovan static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) 36700a708f8fSGustavo F. Padovan { 36710a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 36720a708f8fSGustavo F. Padovan 3673525cd185SGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); 36740a708f8fSGustavo F. Padovan 3675525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 36760a708f8fSGustavo F. Padovan 367742e5c802SGustavo F. Padovan chan->expected_ack_seq = tx_seq; 367842e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 36790a708f8fSGustavo F. Padovan 36800a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 3681525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REJ_ACT) 3682525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REJ_ACT; 36830a708f8fSGustavo F. Padovan else 3684525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 36850a708f8fSGustavo F. Padovan } else { 3686525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 36870a708f8fSGustavo F. Padovan 3688525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_WAIT_F) 3689525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_REJ_ACT; 36900a708f8fSGustavo F. Padovan } 36910a708f8fSGustavo F. Padovan } 3692525cd185SGustavo F. Padovan static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) 36930a708f8fSGustavo F. Padovan { 36940a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 36950a708f8fSGustavo F. Padovan 3696525cd185SGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); 36970a708f8fSGustavo F. Padovan 3698525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 36990a708f8fSGustavo F. Padovan 37000a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 370142e5c802SGustavo F. Padovan chan->expected_ack_seq = tx_seq; 370242e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 37030a708f8fSGustavo F. Padovan 3704525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_FBIT; 3705525cd185SGustavo F. Padovan l2cap_retransmit_one_frame(chan, tx_seq); 37060a708f8fSGustavo F. Padovan 3707525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 37080a708f8fSGustavo F. Padovan 3709525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_WAIT_F) { 37106a026610SGustavo F. Padovan chan->srej_save_reqseq = tx_seq; 3711525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SREJ_ACT; 37120a708f8fSGustavo F. Padovan } 37130a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 3714525cd185SGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) && 37156a026610SGustavo F. Padovan chan->srej_save_reqseq == tx_seq) 3716525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SREJ_ACT; 37170a708f8fSGustavo F. Padovan else 3718525cd185SGustavo F. Padovan l2cap_retransmit_one_frame(chan, tx_seq); 37190a708f8fSGustavo F. Padovan } else { 3720525cd185SGustavo F. Padovan l2cap_retransmit_one_frame(chan, tx_seq); 3721525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_WAIT_F) { 37226a026610SGustavo F. Padovan chan->srej_save_reqseq = tx_seq; 3723525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SREJ_ACT; 37240a708f8fSGustavo F. Padovan } 37250a708f8fSGustavo F. Padovan } 37260a708f8fSGustavo F. Padovan } 37270a708f8fSGustavo F. Padovan 3728525cd185SGustavo F. Padovan static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) 37290a708f8fSGustavo F. Padovan { 37300a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 37310a708f8fSGustavo F. Padovan 3732525cd185SGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); 37330a708f8fSGustavo F. Padovan 3734525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_REMOTE_BUSY; 373542e5c802SGustavo F. Padovan chan->expected_ack_seq = tx_seq; 373642e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 37370a708f8fSGustavo F. Padovan 37380a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 3739525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_FBIT; 37400a708f8fSGustavo F. Padovan 3741525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) { 3742e92c8e70SGustavo F. Padovan del_timer(&chan->retrans_timer); 37430a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 3744525cd185SGustavo F. Padovan l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); 37450a708f8fSGustavo F. Padovan return; 37460a708f8fSGustavo F. Padovan } 37470a708f8fSGustavo F. Padovan 37480a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 3749525cd185SGustavo F. Padovan l2cap_send_srejtail(chan); 37500a708f8fSGustavo F. Padovan else 3751525cd185SGustavo F. Padovan l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); 37520a708f8fSGustavo F. Padovan } 37530a708f8fSGustavo F. Padovan 3754525cd185SGustavo F. Padovan static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) 37550a708f8fSGustavo F. Padovan { 3756525cd185SGustavo F. Padovan BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); 37570a708f8fSGustavo F. Padovan 37580a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 3759525cd185SGustavo F. Padovan chan->conn_state & L2CAP_CONN_WAIT_F) { 3760e92c8e70SGustavo F. Padovan del_timer(&chan->monitor_timer); 37616a026610SGustavo F. Padovan if (chan->unacked_frames > 0) 37620a708f8fSGustavo F. Padovan __mod_retrans_timer(); 3763525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_WAIT_F; 37640a708f8fSGustavo F. Padovan } 37650a708f8fSGustavo F. Padovan 37660a708f8fSGustavo F. Padovan switch (rx_control & L2CAP_CTRL_SUPERVISE) { 37670a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_READY: 3768525cd185SGustavo F. Padovan l2cap_data_channel_rrframe(chan, rx_control); 37690a708f8fSGustavo F. Padovan break; 37700a708f8fSGustavo F. Padovan 37710a708f8fSGustavo F. Padovan case L2CAP_SUPER_REJECT: 3772525cd185SGustavo F. Padovan l2cap_data_channel_rejframe(chan, rx_control); 37730a708f8fSGustavo F. Padovan break; 37740a708f8fSGustavo F. Padovan 37750a708f8fSGustavo F. Padovan case L2CAP_SUPER_SELECT_REJECT: 3776525cd185SGustavo F. Padovan l2cap_data_channel_srejframe(chan, rx_control); 37770a708f8fSGustavo F. Padovan break; 37780a708f8fSGustavo F. Padovan 37790a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_NOT_READY: 3780525cd185SGustavo F. Padovan l2cap_data_channel_rnrframe(chan, rx_control); 37810a708f8fSGustavo F. Padovan break; 37820a708f8fSGustavo F. Padovan } 37830a708f8fSGustavo F. Padovan 37840a708f8fSGustavo F. Padovan kfree_skb(skb); 37850a708f8fSGustavo F. Padovan return 0; 37860a708f8fSGustavo F. Padovan } 37870a708f8fSGustavo F. Padovan 37880a708f8fSGustavo F. Padovan static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) 37890a708f8fSGustavo F. Padovan { 3790525cd185SGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 37910a708f8fSGustavo F. Padovan u16 control; 37920a708f8fSGustavo F. Padovan u8 req_seq; 37930a708f8fSGustavo F. Padovan int len, next_tx_seq_offset, req_seq_offset; 37940a708f8fSGustavo F. Padovan 37950a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 37960a708f8fSGustavo F. Padovan skb_pull(skb, 2); 37970a708f8fSGustavo F. Padovan len = skb->len; 37980a708f8fSGustavo F. Padovan 37990a708f8fSGustavo F. Padovan /* 38000a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 38010a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 38020a708f8fSGustavo F. Padovan * procedures and ask retransmission. 38030a708f8fSGustavo F. Padovan */ 380447d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 38050a708f8fSGustavo F. Padovan goto drop; 38060a708f8fSGustavo F. Padovan 38070a708f8fSGustavo F. Padovan if (__is_sar_start(control) && __is_iframe(control)) 38080a708f8fSGustavo F. Padovan len -= 2; 38090a708f8fSGustavo F. Padovan 381047d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 38110a708f8fSGustavo F. Padovan len -= 2; 38120a708f8fSGustavo F. Padovan 381347d1ec61SGustavo F. Padovan if (len > chan->mps) { 38148c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 38150a708f8fSGustavo F. Padovan goto drop; 38160a708f8fSGustavo F. Padovan } 38170a708f8fSGustavo F. Padovan 38180a708f8fSGustavo F. Padovan req_seq = __get_reqseq(control); 381942e5c802SGustavo F. Padovan req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; 38200a708f8fSGustavo F. Padovan if (req_seq_offset < 0) 38210a708f8fSGustavo F. Padovan req_seq_offset += 64; 38220a708f8fSGustavo F. Padovan 38230a708f8fSGustavo F. Padovan next_tx_seq_offset = 382442e5c802SGustavo F. Padovan (chan->next_tx_seq - chan->expected_ack_seq) % 64; 38250a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 38260a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 38270a708f8fSGustavo F. Padovan 38280a708f8fSGustavo F. Padovan /* check for invalid req-seq */ 38290a708f8fSGustavo F. Padovan if (req_seq_offset > next_tx_seq_offset) { 38308c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 38310a708f8fSGustavo F. Padovan goto drop; 38320a708f8fSGustavo F. Padovan } 38330a708f8fSGustavo F. Padovan 38340a708f8fSGustavo F. Padovan if (__is_iframe(control)) { 38350a708f8fSGustavo F. Padovan if (len < 0) { 38368c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 38370a708f8fSGustavo F. Padovan goto drop; 38380a708f8fSGustavo F. Padovan } 38390a708f8fSGustavo F. Padovan 3840525cd185SGustavo F. Padovan l2cap_data_channel_iframe(chan, control, skb); 38410a708f8fSGustavo F. Padovan } else { 38420a708f8fSGustavo F. Padovan if (len != 0) { 38430a708f8fSGustavo F. Padovan BT_ERR("%d", len); 38448c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 38450a708f8fSGustavo F. Padovan goto drop; 38460a708f8fSGustavo F. Padovan } 38470a708f8fSGustavo F. Padovan 3848525cd185SGustavo F. Padovan l2cap_data_channel_sframe(chan, control, skb); 38490a708f8fSGustavo F. Padovan } 38500a708f8fSGustavo F. Padovan 38510a708f8fSGustavo F. Padovan return 0; 38520a708f8fSGustavo F. Padovan 38530a708f8fSGustavo F. Padovan drop: 38540a708f8fSGustavo F. Padovan kfree_skb(skb); 38550a708f8fSGustavo F. Padovan return 0; 38560a708f8fSGustavo F. Padovan } 38570a708f8fSGustavo F. Padovan 38580a708f8fSGustavo F. Padovan static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) 38590a708f8fSGustavo F. Padovan { 386048454079SGustavo F. Padovan struct l2cap_chan *chan; 3861bf734843SDavid S. Miller struct sock *sk = NULL; 38620a708f8fSGustavo F. Padovan u16 control; 38630a708f8fSGustavo F. Padovan u8 tx_seq; 38640a708f8fSGustavo F. Padovan int len; 38650a708f8fSGustavo F. Padovan 3866baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 386748454079SGustavo F. Padovan if (!chan) { 38680a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 38690a708f8fSGustavo F. Padovan goto drop; 38700a708f8fSGustavo F. Padovan } 38710a708f8fSGustavo F. Padovan 387248454079SGustavo F. Padovan sk = chan->sk; 38730a708f8fSGustavo F. Padovan 387449208c9cSGustavo F. Padovan BT_DBG("chan %p, len %d", chan, skb->len); 38750a708f8fSGustavo F. Padovan 38760a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 38770a708f8fSGustavo F. Padovan goto drop; 38780a708f8fSGustavo F. Padovan 38790c1bc5c6SGustavo F. Padovan switch (chan->mode) { 38800a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 38810a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 38820a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 38830a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 38840a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 38850a708f8fSGustavo F. Padovan 38860c1bc5c6SGustavo F. Padovan if (chan->imtu < skb->len) 38870a708f8fSGustavo F. Padovan goto drop; 38880a708f8fSGustavo F. Padovan 38890a708f8fSGustavo F. Padovan if (!sock_queue_rcv_skb(sk, skb)) 38900a708f8fSGustavo F. Padovan goto done; 38910a708f8fSGustavo F. Padovan break; 38920a708f8fSGustavo F. Padovan 38930a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 38940a708f8fSGustavo F. Padovan if (!sock_owned_by_user(sk)) { 38950a708f8fSGustavo F. Padovan l2cap_ertm_data_rcv(sk, skb); 38960a708f8fSGustavo F. Padovan } else { 38970a708f8fSGustavo F. Padovan if (sk_add_backlog(sk, skb)) 38980a708f8fSGustavo F. Padovan goto drop; 38990a708f8fSGustavo F. Padovan } 39000a708f8fSGustavo F. Padovan 39010a708f8fSGustavo F. Padovan goto done; 39020a708f8fSGustavo F. Padovan 39030a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 39040a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 39050a708f8fSGustavo F. Padovan skb_pull(skb, 2); 39060a708f8fSGustavo F. Padovan len = skb->len; 39070a708f8fSGustavo F. Padovan 390847d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 39090a708f8fSGustavo F. Padovan goto drop; 39100a708f8fSGustavo F. Padovan 39110a708f8fSGustavo F. Padovan if (__is_sar_start(control)) 39120a708f8fSGustavo F. Padovan len -= 2; 39130a708f8fSGustavo F. Padovan 391447d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 39150a708f8fSGustavo F. Padovan len -= 2; 39160a708f8fSGustavo F. Padovan 391747d1ec61SGustavo F. Padovan if (len > chan->mps || len < 0 || __is_sframe(control)) 39180a708f8fSGustavo F. Padovan goto drop; 39190a708f8fSGustavo F. Padovan 39200a708f8fSGustavo F. Padovan tx_seq = __get_txseq(control); 39210a708f8fSGustavo F. Padovan 392242e5c802SGustavo F. Padovan if (chan->expected_tx_seq == tx_seq) 392342e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 39240a708f8fSGustavo F. Padovan else 392542e5c802SGustavo F. Padovan chan->expected_tx_seq = (tx_seq + 1) % 64; 39260a708f8fSGustavo F. Padovan 3927525cd185SGustavo F. Padovan l2cap_streaming_reassembly_sdu(chan, skb, control); 39280a708f8fSGustavo F. Padovan 39290a708f8fSGustavo F. Padovan goto done; 39300a708f8fSGustavo F. Padovan 39310a708f8fSGustavo F. Padovan default: 39320c1bc5c6SGustavo F. Padovan BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); 39330a708f8fSGustavo F. Padovan break; 39340a708f8fSGustavo F. Padovan } 39350a708f8fSGustavo F. Padovan 39360a708f8fSGustavo F. Padovan drop: 39370a708f8fSGustavo F. Padovan kfree_skb(skb); 39380a708f8fSGustavo F. Padovan 39390a708f8fSGustavo F. Padovan done: 39400a708f8fSGustavo F. Padovan if (sk) 39410a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 39420a708f8fSGustavo F. Padovan 39430a708f8fSGustavo F. Padovan return 0; 39440a708f8fSGustavo F. Padovan } 39450a708f8fSGustavo F. Padovan 39460a708f8fSGustavo F. Padovan static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) 39470a708f8fSGustavo F. Padovan { 39486dcae1eaSDavid S. Miller struct sock *sk = NULL; 394923691d75SGustavo F. Padovan struct l2cap_chan *chan; 39500a708f8fSGustavo F. Padovan 395123691d75SGustavo F. Padovan chan = l2cap_global_chan_by_psm(0, psm, conn->src); 395223691d75SGustavo F. Padovan if (!chan) 39530a708f8fSGustavo F. Padovan goto drop; 39540a708f8fSGustavo F. Padovan 395523691d75SGustavo F. Padovan sk = chan->sk; 395623691d75SGustavo F. Padovan 39570a708f8fSGustavo F. Padovan bh_lock_sock(sk); 39580a708f8fSGustavo F. Padovan 39590a708f8fSGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 39600a708f8fSGustavo F. Padovan 39610a708f8fSGustavo F. Padovan if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) 39620a708f8fSGustavo F. Padovan goto drop; 39630a708f8fSGustavo F. Padovan 39640c1bc5c6SGustavo F. Padovan if (l2cap_pi(sk)->chan->imtu < skb->len) 39650a708f8fSGustavo F. Padovan goto drop; 39660a708f8fSGustavo F. Padovan 39670a708f8fSGustavo F. Padovan if (!sock_queue_rcv_skb(sk, skb)) 39680a708f8fSGustavo F. Padovan goto done; 39690a708f8fSGustavo F. Padovan 39700a708f8fSGustavo F. Padovan drop: 39710a708f8fSGustavo F. Padovan kfree_skb(skb); 39720a708f8fSGustavo F. Padovan 39730a708f8fSGustavo F. Padovan done: 39740a708f8fSGustavo F. Padovan if (sk) 39750a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 39760a708f8fSGustavo F. Padovan return 0; 39770a708f8fSGustavo F. Padovan } 39780a708f8fSGustavo F. Padovan 39799f69bda6SGustavo F. Padovan static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) 39809f69bda6SGustavo F. Padovan { 39816dcae1eaSDavid S. Miller struct sock *sk = NULL; 398223691d75SGustavo F. Padovan struct l2cap_chan *chan; 39839f69bda6SGustavo F. Padovan 398423691d75SGustavo F. Padovan chan = l2cap_global_chan_by_scid(0, cid, conn->src); 398523691d75SGustavo F. Padovan if (!chan) 39869f69bda6SGustavo F. Padovan goto drop; 39879f69bda6SGustavo F. Padovan 398823691d75SGustavo F. Padovan sk = chan->sk; 398923691d75SGustavo F. Padovan 39909f69bda6SGustavo F. Padovan bh_lock_sock(sk); 39919f69bda6SGustavo F. Padovan 39929f69bda6SGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 39939f69bda6SGustavo F. Padovan 39949f69bda6SGustavo F. Padovan if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) 39959f69bda6SGustavo F. Padovan goto drop; 39969f69bda6SGustavo F. Padovan 39970c1bc5c6SGustavo F. Padovan if (l2cap_pi(sk)->chan->imtu < skb->len) 39989f69bda6SGustavo F. Padovan goto drop; 39999f69bda6SGustavo F. Padovan 40009f69bda6SGustavo F. Padovan if (!sock_queue_rcv_skb(sk, skb)) 40019f69bda6SGustavo F. Padovan goto done; 40029f69bda6SGustavo F. Padovan 40039f69bda6SGustavo F. Padovan drop: 40049f69bda6SGustavo F. Padovan kfree_skb(skb); 40059f69bda6SGustavo F. Padovan 40069f69bda6SGustavo F. Padovan done: 40079f69bda6SGustavo F. Padovan if (sk) 40089f69bda6SGustavo F. Padovan bh_unlock_sock(sk); 40099f69bda6SGustavo F. Padovan return 0; 40109f69bda6SGustavo F. Padovan } 40119f69bda6SGustavo F. Padovan 40120a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 40130a708f8fSGustavo F. Padovan { 40140a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 40150a708f8fSGustavo F. Padovan u16 cid, len; 40160a708f8fSGustavo F. Padovan __le16 psm; 40170a708f8fSGustavo F. Padovan 40180a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 40190a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 40200a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 40210a708f8fSGustavo F. Padovan 40220a708f8fSGustavo F. Padovan if (len != skb->len) { 40230a708f8fSGustavo F. Padovan kfree_skb(skb); 40240a708f8fSGustavo F. Padovan return; 40250a708f8fSGustavo F. Padovan } 40260a708f8fSGustavo F. Padovan 40270a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 40280a708f8fSGustavo F. Padovan 40290a708f8fSGustavo F. Padovan switch (cid) { 40303300d9a9SClaudio Takahasi case L2CAP_CID_LE_SIGNALING: 40310a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 40320a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 40330a708f8fSGustavo F. Padovan break; 40340a708f8fSGustavo F. Padovan 40350a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 40360a708f8fSGustavo F. Padovan psm = get_unaligned_le16(skb->data); 40370a708f8fSGustavo F. Padovan skb_pull(skb, 2); 40380a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 40390a708f8fSGustavo F. Padovan break; 40400a708f8fSGustavo F. Padovan 40419f69bda6SGustavo F. Padovan case L2CAP_CID_LE_DATA: 40429f69bda6SGustavo F. Padovan l2cap_att_channel(conn, cid, skb); 40439f69bda6SGustavo F. Padovan break; 40449f69bda6SGustavo F. Padovan 40450a708f8fSGustavo F. Padovan default: 40460a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 40470a708f8fSGustavo F. Padovan break; 40480a708f8fSGustavo F. Padovan } 40490a708f8fSGustavo F. Padovan } 40500a708f8fSGustavo F. Padovan 40510a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 40520a708f8fSGustavo F. Padovan 40530a708f8fSGustavo F. Padovan static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) 40540a708f8fSGustavo F. Padovan { 40550a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 405623691d75SGustavo F. Padovan struct l2cap_chan *c; 40570a708f8fSGustavo F. Padovan 40580a708f8fSGustavo F. Padovan if (type != ACL_LINK) 40590a708f8fSGustavo F. Padovan return -EINVAL; 40600a708f8fSGustavo F. Padovan 40610a708f8fSGustavo F. Padovan BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); 40620a708f8fSGustavo F. Padovan 40630a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 406423691d75SGustavo F. Padovan read_lock(&chan_list_lock); 406523691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 406623691d75SGustavo F. Padovan struct sock *sk = c->sk; 40674343478fSGustavo F. Padovan 40680a708f8fSGustavo F. Padovan if (sk->sk_state != BT_LISTEN) 40690a708f8fSGustavo F. Padovan continue; 40700a708f8fSGustavo F. Padovan 40710a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { 40720a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 407323691d75SGustavo F. Padovan if (c->role_switch) 40740a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 40750a708f8fSGustavo F. Padovan exact++; 40760a708f8fSGustavo F. Padovan } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { 40770a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 407823691d75SGustavo F. Padovan if (c->role_switch) 40790a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 40800a708f8fSGustavo F. Padovan } 40810a708f8fSGustavo F. Padovan } 408223691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 40830a708f8fSGustavo F. Padovan 40840a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 40850a708f8fSGustavo F. Padovan } 40860a708f8fSGustavo F. Padovan 40870a708f8fSGustavo F. Padovan static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 40880a708f8fSGustavo F. Padovan { 40890a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 40900a708f8fSGustavo F. Padovan 40910a708f8fSGustavo F. Padovan BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); 40920a708f8fSGustavo F. Padovan 4093acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 40940a708f8fSGustavo F. Padovan return -EINVAL; 40950a708f8fSGustavo F. Padovan 40960a708f8fSGustavo F. Padovan if (!status) { 40970a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, status); 40980a708f8fSGustavo F. Padovan if (conn) 40990a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 41000a708f8fSGustavo F. Padovan } else 41010a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(status)); 41020a708f8fSGustavo F. Padovan 41030a708f8fSGustavo F. Padovan return 0; 41040a708f8fSGustavo F. Padovan } 41050a708f8fSGustavo F. Padovan 41060a708f8fSGustavo F. Padovan static int l2cap_disconn_ind(struct hci_conn *hcon) 41070a708f8fSGustavo F. Padovan { 41080a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 41090a708f8fSGustavo F. Padovan 41100a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 41110a708f8fSGustavo F. Padovan 41120a708f8fSGustavo F. Padovan if (hcon->type != ACL_LINK || !conn) 41130a708f8fSGustavo F. Padovan return 0x13; 41140a708f8fSGustavo F. Padovan 41150a708f8fSGustavo F. Padovan return conn->disc_reason; 41160a708f8fSGustavo F. Padovan } 41170a708f8fSGustavo F. Padovan 41180a708f8fSGustavo F. Padovan static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 41190a708f8fSGustavo F. Padovan { 41200a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 41210a708f8fSGustavo F. Padovan 4122acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 41230a708f8fSGustavo F. Padovan return -EINVAL; 41240a708f8fSGustavo F. Padovan 41250a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(reason)); 41260a708f8fSGustavo F. Padovan 41270a708f8fSGustavo F. Padovan return 0; 41280a708f8fSGustavo F. Padovan } 41290a708f8fSGustavo F. Padovan 41304343478fSGustavo F. Padovan static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) 41310a708f8fSGustavo F. Padovan { 4132715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) 41330a708f8fSGustavo F. Padovan return; 41340a708f8fSGustavo F. Padovan 41350a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 41364343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) { 4137ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 4138ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ * 5); 41394343478fSGustavo F. Padovan } else if (chan->sec_level == BT_SECURITY_HIGH) 41400f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNREFUSED); 41410a708f8fSGustavo F. Padovan } else { 41424343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) 4143ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 41440a708f8fSGustavo F. Padovan } 41450a708f8fSGustavo F. Padovan } 41460a708f8fSGustavo F. Padovan 41470a708f8fSGustavo F. Padovan static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 41480a708f8fSGustavo F. Padovan { 41490a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 415048454079SGustavo F. Padovan struct l2cap_chan *chan; 41510a708f8fSGustavo F. Padovan 41520a708f8fSGustavo F. Padovan if (!conn) 41530a708f8fSGustavo F. Padovan return 0; 41540a708f8fSGustavo F. Padovan 41550a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 41560a708f8fSGustavo F. Padovan 4157baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 41580a708f8fSGustavo F. Padovan 4159baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 416048454079SGustavo F. Padovan struct sock *sk = chan->sk; 4161baa7e1faSGustavo F. Padovan 41620a708f8fSGustavo F. Padovan bh_lock_sock(sk); 41630a708f8fSGustavo F. Padovan 4164b4450035SGustavo F. Padovan if (chan->conf_state & L2CAP_CONF_CONNECT_PEND) { 41650a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 41660a708f8fSGustavo F. Padovan continue; 41670a708f8fSGustavo F. Padovan } 41680a708f8fSGustavo F. Padovan 41690a708f8fSGustavo F. Padovan if (!status && (sk->sk_state == BT_CONNECTED || 41700a708f8fSGustavo F. Padovan sk->sk_state == BT_CONFIG)) { 41714343478fSGustavo F. Padovan l2cap_check_encryption(chan, encrypt); 41720a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 41730a708f8fSGustavo F. Padovan continue; 41740a708f8fSGustavo F. Padovan } 41750a708f8fSGustavo F. Padovan 41760a708f8fSGustavo F. Padovan if (sk->sk_state == BT_CONNECT) { 41770a708f8fSGustavo F. Padovan if (!status) { 41780a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 4179fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 4180fe4128e0SGustavo F. Padovan req.psm = chan->psm; 41810a708f8fSGustavo F. Padovan 4182fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 4183b4450035SGustavo F. Padovan chan->conf_state |= L2CAP_CONF_CONNECT_PEND; 41840a708f8fSGustavo F. Padovan 4185fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 41860a708f8fSGustavo F. Padovan L2CAP_CONN_REQ, sizeof(req), &req); 41870a708f8fSGustavo F. Padovan } else { 4188ab07801dSGustavo F. Padovan l2cap_chan_clear_timer(chan); 4189ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 10); 41900a708f8fSGustavo F. Padovan } 41910a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT2) { 41920a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 41930a708f8fSGustavo F. Padovan __u16 result; 41940a708f8fSGustavo F. Padovan 41950a708f8fSGustavo F. Padovan if (!status) { 41960a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 41970a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 41980a708f8fSGustavo F. Padovan } else { 41990a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 4200ab07801dSGustavo F. Padovan l2cap_chan_set_timer(chan, HZ / 10); 42010a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 42020a708f8fSGustavo F. Padovan } 42030a708f8fSGustavo F. Padovan 4204fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 4205fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 42060a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 42070a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 4208fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 4209fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 42100a708f8fSGustavo F. Padovan } 42110a708f8fSGustavo F. Padovan 42120a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 42130a708f8fSGustavo F. Padovan } 42140a708f8fSGustavo F. Padovan 4215baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 42160a708f8fSGustavo F. Padovan 42170a708f8fSGustavo F. Padovan return 0; 42180a708f8fSGustavo F. Padovan } 42190a708f8fSGustavo F. Padovan 42200a708f8fSGustavo F. Padovan static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 42210a708f8fSGustavo F. Padovan { 42220a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 42230a708f8fSGustavo F. Padovan 42240a708f8fSGustavo F. Padovan if (!conn) 42250a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 42260a708f8fSGustavo F. Padovan 42270a708f8fSGustavo F. Padovan if (!conn) 42280a708f8fSGustavo F. Padovan goto drop; 42290a708f8fSGustavo F. Padovan 42300a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 42310a708f8fSGustavo F. Padovan 42320a708f8fSGustavo F. Padovan if (!(flags & ACL_CONT)) { 42330a708f8fSGustavo F. Padovan struct l2cap_hdr *hdr; 423448454079SGustavo F. Padovan struct l2cap_chan *chan; 42350a708f8fSGustavo F. Padovan u16 cid; 42360a708f8fSGustavo F. Padovan int len; 42370a708f8fSGustavo F. Padovan 42380a708f8fSGustavo F. Padovan if (conn->rx_len) { 42390a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 42400a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 42410a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 42420a708f8fSGustavo F. Padovan conn->rx_len = 0; 42430a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 42440a708f8fSGustavo F. Padovan } 42450a708f8fSGustavo F. Padovan 42460a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 42470a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 42480a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 42490a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 42500a708f8fSGustavo F. Padovan goto drop; 42510a708f8fSGustavo F. Padovan } 42520a708f8fSGustavo F. Padovan 42530a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 42540a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 42550a708f8fSGustavo F. Padovan cid = __le16_to_cpu(hdr->cid); 42560a708f8fSGustavo F. Padovan 42570a708f8fSGustavo F. Padovan if (len == skb->len) { 42580a708f8fSGustavo F. Padovan /* Complete frame received */ 42590a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 42600a708f8fSGustavo F. Padovan return 0; 42610a708f8fSGustavo F. Padovan } 42620a708f8fSGustavo F. Padovan 42630a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 42640a708f8fSGustavo F. Padovan 42650a708f8fSGustavo F. Padovan if (skb->len > len) { 42660a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 42670a708f8fSGustavo F. Padovan skb->len, len); 42680a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 42690a708f8fSGustavo F. Padovan goto drop; 42700a708f8fSGustavo F. Padovan } 42710a708f8fSGustavo F. Padovan 4272baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 42730a708f8fSGustavo F. Padovan 427448454079SGustavo F. Padovan if (chan && chan->sk) { 427548454079SGustavo F. Padovan struct sock *sk = chan->sk; 427648454079SGustavo F. Padovan 42770c1bc5c6SGustavo F. Padovan if (chan->imtu < len - L2CAP_HDR_SIZE) { 427848454079SGustavo F. Padovan BT_ERR("Frame exceeding recv MTU (len %d, " 427948454079SGustavo F. Padovan "MTU %d)", len, 42800c1bc5c6SGustavo F. Padovan chan->imtu); 42810a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 42820a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 42830a708f8fSGustavo F. Padovan goto drop; 42840a708f8fSGustavo F. Padovan } 42850a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 428648454079SGustavo F. Padovan } 42870a708f8fSGustavo F. Padovan 42880a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 42890a708f8fSGustavo F. Padovan conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); 42900a708f8fSGustavo F. Padovan if (!conn->rx_skb) 42910a708f8fSGustavo F. Padovan goto drop; 42920a708f8fSGustavo F. Padovan 42930a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 42940a708f8fSGustavo F. Padovan skb->len); 42950a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 42960a708f8fSGustavo F. Padovan } else { 42970a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 42980a708f8fSGustavo F. Padovan 42990a708f8fSGustavo F. Padovan if (!conn->rx_len) { 43000a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 43010a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 43020a708f8fSGustavo F. Padovan goto drop; 43030a708f8fSGustavo F. Padovan } 43040a708f8fSGustavo F. Padovan 43050a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 43060a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 43070a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 43080a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 43090a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 43100a708f8fSGustavo F. Padovan conn->rx_len = 0; 43110a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 43120a708f8fSGustavo F. Padovan goto drop; 43130a708f8fSGustavo F. Padovan } 43140a708f8fSGustavo F. Padovan 43150a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 43160a708f8fSGustavo F. Padovan skb->len); 43170a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 43180a708f8fSGustavo F. Padovan 43190a708f8fSGustavo F. Padovan if (!conn->rx_len) { 43200a708f8fSGustavo F. Padovan /* Complete frame received */ 43210a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, conn->rx_skb); 43220a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 43230a708f8fSGustavo F. Padovan } 43240a708f8fSGustavo F. Padovan } 43250a708f8fSGustavo F. Padovan 43260a708f8fSGustavo F. Padovan drop: 43270a708f8fSGustavo F. Padovan kfree_skb(skb); 43280a708f8fSGustavo F. Padovan return 0; 43290a708f8fSGustavo F. Padovan } 43300a708f8fSGustavo F. Padovan 43310a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 43320a708f8fSGustavo F. Padovan { 433323691d75SGustavo F. Padovan struct l2cap_chan *c; 43340a708f8fSGustavo F. Padovan 433523691d75SGustavo F. Padovan read_lock_bh(&chan_list_lock); 43360a708f8fSGustavo F. Padovan 433723691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 433823691d75SGustavo F. Padovan struct sock *sk = c->sk; 43390a708f8fSGustavo F. Padovan 4340903d343eSGustavo F. Padovan seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 43410a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->src), 43420a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->dst), 434323691d75SGustavo F. Padovan sk->sk_state, __le16_to_cpu(c->psm), 434423691d75SGustavo F. Padovan c->scid, c->dcid, c->imtu, c->omtu, 434523691d75SGustavo F. Padovan c->sec_level, c->mode); 43460a708f8fSGustavo F. Padovan } 43470a708f8fSGustavo F. Padovan 434823691d75SGustavo F. Padovan read_unlock_bh(&chan_list_lock); 43490a708f8fSGustavo F. Padovan 43500a708f8fSGustavo F. Padovan return 0; 43510a708f8fSGustavo F. Padovan } 43520a708f8fSGustavo F. Padovan 43530a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 43540a708f8fSGustavo F. Padovan { 43550a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 43560a708f8fSGustavo F. Padovan } 43570a708f8fSGustavo F. Padovan 43580a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 43590a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 43600a708f8fSGustavo F. Padovan .read = seq_read, 43610a708f8fSGustavo F. Padovan .llseek = seq_lseek, 43620a708f8fSGustavo F. Padovan .release = single_release, 43630a708f8fSGustavo F. Padovan }; 43640a708f8fSGustavo F. Padovan 43650a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 43660a708f8fSGustavo F. Padovan 43670a708f8fSGustavo F. Padovan static struct hci_proto l2cap_hci_proto = { 43680a708f8fSGustavo F. Padovan .name = "L2CAP", 43690a708f8fSGustavo F. Padovan .id = HCI_PROTO_L2CAP, 43700a708f8fSGustavo F. Padovan .connect_ind = l2cap_connect_ind, 43710a708f8fSGustavo F. Padovan .connect_cfm = l2cap_connect_cfm, 43720a708f8fSGustavo F. Padovan .disconn_ind = l2cap_disconn_ind, 43730a708f8fSGustavo F. Padovan .disconn_cfm = l2cap_disconn_cfm, 43740a708f8fSGustavo F. Padovan .security_cfm = l2cap_security_cfm, 43750a708f8fSGustavo F. Padovan .recv_acldata = l2cap_recv_acldata 43760a708f8fSGustavo F. Padovan }; 43770a708f8fSGustavo F. Padovan 437864274518SGustavo F. Padovan int __init l2cap_init(void) 43790a708f8fSGustavo F. Padovan { 43800a708f8fSGustavo F. Padovan int err; 43810a708f8fSGustavo F. Padovan 4382bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 43830a708f8fSGustavo F. Padovan if (err < 0) 43840a708f8fSGustavo F. Padovan return err; 43850a708f8fSGustavo F. Padovan 43860a708f8fSGustavo F. Padovan _busy_wq = create_singlethread_workqueue("l2cap"); 43870a708f8fSGustavo F. Padovan if (!_busy_wq) { 4388bb58f747SGustavo F. Padovan err = -ENOMEM; 43890a708f8fSGustavo F. Padovan goto error; 43900a708f8fSGustavo F. Padovan } 43910a708f8fSGustavo F. Padovan 43920a708f8fSGustavo F. Padovan err = hci_register_proto(&l2cap_hci_proto); 43930a708f8fSGustavo F. Padovan if (err < 0) { 43940a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol registration failed"); 43950a708f8fSGustavo F. Padovan bt_sock_unregister(BTPROTO_L2CAP); 43960a708f8fSGustavo F. Padovan goto error; 43970a708f8fSGustavo F. Padovan } 43980a708f8fSGustavo F. Padovan 43990a708f8fSGustavo F. Padovan if (bt_debugfs) { 44000a708f8fSGustavo F. Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, 44010a708f8fSGustavo F. Padovan bt_debugfs, NULL, &l2cap_debugfs_fops); 44020a708f8fSGustavo F. Padovan if (!l2cap_debugfs) 44030a708f8fSGustavo F. Padovan BT_ERR("Failed to create L2CAP debug file"); 44040a708f8fSGustavo F. Padovan } 44050a708f8fSGustavo F. Padovan 44060a708f8fSGustavo F. Padovan return 0; 44070a708f8fSGustavo F. Padovan 44080a708f8fSGustavo F. Padovan error: 44090a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 4410bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 44110a708f8fSGustavo F. Padovan return err; 44120a708f8fSGustavo F. Padovan } 44130a708f8fSGustavo F. Padovan 441464274518SGustavo F. Padovan void l2cap_exit(void) 44150a708f8fSGustavo F. Padovan { 44160a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 44170a708f8fSGustavo F. Padovan 44180a708f8fSGustavo F. Padovan flush_workqueue(_busy_wq); 44190a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 44200a708f8fSGustavo F. Padovan 44210a708f8fSGustavo F. Padovan if (hci_unregister_proto(&l2cap_hci_proto) < 0) 44220a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol unregistration failed"); 44230a708f8fSGustavo F. Padovan 4424bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 44250a708f8fSGustavo F. Padovan } 44260a708f8fSGustavo F. Padovan 44270a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 44280a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 4429