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 65bb58f747SGustavo F. Padovan struct bt_sock_list l2cap_sk_list = { 660a708f8fSGustavo F. Padovan .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) 670a708f8fSGustavo F. Padovan }; 680a708f8fSGustavo F. Padovan 690a708f8fSGustavo F. Padovan static void l2cap_busy_work(struct work_struct *work); 700a708f8fSGustavo F. Padovan 710a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 720a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data); 730a708f8fSGustavo F. Padovan 740a708f8fSGustavo F. Padovan static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); 750a708f8fSGustavo F. Padovan 760a708f8fSGustavo F. Padovan /* ---- L2CAP channels ---- */ 77baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) 780a708f8fSGustavo F. Padovan { 7948454079SGustavo F. Padovan struct l2cap_chan *c; 80baa7e1faSGustavo F. Padovan 81baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 82baa7e1faSGustavo F. Padovan struct sock *s = c->sk; 83baa7e1faSGustavo F. Padovan if (l2cap_pi(s)->dcid == cid) 8448454079SGustavo F. Padovan return c; 850a708f8fSGustavo F. Padovan } 86baa7e1faSGustavo F. Padovan return NULL; 87baa7e1faSGustavo F. Padovan 88baa7e1faSGustavo F. Padovan } 890a708f8fSGustavo F. Padovan 90baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) 910a708f8fSGustavo F. Padovan { 9248454079SGustavo F. Padovan struct l2cap_chan *c; 93baa7e1faSGustavo F. Padovan 94baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 95baa7e1faSGustavo F. Padovan struct sock *s = c->sk; 96baa7e1faSGustavo F. Padovan if (l2cap_pi(s)->scid == cid) 9748454079SGustavo F. Padovan return c; 980a708f8fSGustavo F. Padovan } 99baa7e1faSGustavo F. Padovan return NULL; 100baa7e1faSGustavo F. Padovan } 1010a708f8fSGustavo F. Padovan 1020a708f8fSGustavo F. Padovan /* Find channel with given SCID. 1030a708f8fSGustavo F. Padovan * Returns locked socket */ 104baa7e1faSGustavo F. Padovan static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) 1050a708f8fSGustavo F. Padovan { 10648454079SGustavo F. Padovan struct l2cap_chan *c; 107baa7e1faSGustavo F. Padovan 108baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 109baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_scid(conn, cid); 11048454079SGustavo F. Padovan if (c) 11148454079SGustavo F. Padovan bh_lock_sock(c->sk); 112baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 11348454079SGustavo F. Padovan return c; 1140a708f8fSGustavo F. Padovan } 1150a708f8fSGustavo F. Padovan 116baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) 1170a708f8fSGustavo F. Padovan { 11848454079SGustavo F. Padovan struct l2cap_chan *c; 119baa7e1faSGustavo F. Padovan 120baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 121fc7f8a7eSGustavo F. Padovan if (c->ident == ident) 12248454079SGustavo F. Padovan return c; 1230a708f8fSGustavo F. Padovan } 124baa7e1faSGustavo F. Padovan return NULL; 125baa7e1faSGustavo F. Padovan } 1260a708f8fSGustavo F. Padovan 127baa7e1faSGustavo F. Padovan static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) 1280a708f8fSGustavo F. Padovan { 12948454079SGustavo F. Padovan struct l2cap_chan *c; 130baa7e1faSGustavo F. Padovan 131baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 132baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_ident(conn, ident); 13348454079SGustavo F. Padovan if (c) 13448454079SGustavo F. Padovan bh_lock_sock(c->sk); 135baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 13648454079SGustavo F. Padovan return c; 1370a708f8fSGustavo F. Padovan } 1380a708f8fSGustavo F. Padovan 139baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 1400a708f8fSGustavo F. Padovan { 1410a708f8fSGustavo F. Padovan u16 cid = L2CAP_CID_DYN_START; 1420a708f8fSGustavo F. Padovan 1430a708f8fSGustavo F. Padovan for (; cid < L2CAP_CID_DYN_END; cid++) { 144baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 1450a708f8fSGustavo F. Padovan return cid; 1460a708f8fSGustavo F. Padovan } 1470a708f8fSGustavo F. Padovan 1480a708f8fSGustavo F. Padovan return 0; 1490a708f8fSGustavo F. Padovan } 1500a708f8fSGustavo F. Padovan 15148454079SGustavo F. Padovan static struct l2cap_chan *l2cap_chan_alloc(struct sock *sk) 1520a708f8fSGustavo F. Padovan { 15348454079SGustavo F. Padovan struct l2cap_chan *chan; 1540a708f8fSGustavo F. Padovan 15548454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 15648454079SGustavo F. Padovan if (!chan) 15748454079SGustavo F. Padovan return NULL; 1580a708f8fSGustavo F. Padovan 15948454079SGustavo F. Padovan chan->sk = sk; 16048454079SGustavo F. Padovan 16148454079SGustavo F. Padovan return chan; 1620a708f8fSGustavo F. Padovan } 1630a708f8fSGustavo F. Padovan 16448454079SGustavo F. Padovan static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 1650a708f8fSGustavo F. Padovan { 16648454079SGustavo F. Padovan struct sock *sk = chan->sk; 1670a708f8fSGustavo F. Padovan 1680a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 1690a708f8fSGustavo F. Padovan l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); 1700a708f8fSGustavo F. Padovan 1710a708f8fSGustavo F. Padovan conn->disc_reason = 0x13; 1720a708f8fSGustavo F. Padovan 1730a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn = conn; 1740a708f8fSGustavo F. Padovan 1750a708f8fSGustavo F. Padovan if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { 176b62f328bSVille Tervo if (conn->hcon->type == LE_LINK) { 177b62f328bSVille Tervo /* LE connection */ 178b62f328bSVille Tervo l2cap_pi(sk)->omtu = L2CAP_LE_DEFAULT_MTU; 179b62f328bSVille Tervo l2cap_pi(sk)->scid = L2CAP_CID_LE_DATA; 180b62f328bSVille Tervo l2cap_pi(sk)->dcid = L2CAP_CID_LE_DATA; 181b62f328bSVille Tervo } else { 1820a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 183baa7e1faSGustavo F. Padovan l2cap_pi(sk)->scid = l2cap_alloc_cid(conn); 184b62f328bSVille Tervo l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; 185b62f328bSVille Tervo } 1860a708f8fSGustavo F. Padovan } else if (sk->sk_type == SOCK_DGRAM) { 1870a708f8fSGustavo F. Padovan /* Connectionless socket */ 1880a708f8fSGustavo F. Padovan l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; 1890a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; 1900a708f8fSGustavo F. Padovan l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; 1910a708f8fSGustavo F. Padovan } else { 1920a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 1930a708f8fSGustavo F. Padovan l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; 1940a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; 1950a708f8fSGustavo F. Padovan l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; 1960a708f8fSGustavo F. Padovan } 1970a708f8fSGustavo F. Padovan 198baa7e1faSGustavo F. Padovan sock_hold(sk); 199baa7e1faSGustavo F. Padovan 200baa7e1faSGustavo F. Padovan list_add(&chan->list, &conn->chan_l); 2010a708f8fSGustavo F. Padovan } 2020a708f8fSGustavo F. Padovan 2030a708f8fSGustavo F. Padovan /* Delete channel. 2040a708f8fSGustavo F. Padovan * Must be called on the locked socket. */ 20548454079SGustavo F. Padovan void l2cap_chan_del(struct l2cap_chan *chan, int err) 2060a708f8fSGustavo F. Padovan { 20748454079SGustavo F. Padovan struct sock *sk = chan->sk; 2080a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 2090a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 2100a708f8fSGustavo F. Padovan 2110a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 2120a708f8fSGustavo F. Padovan 2130a708f8fSGustavo F. Padovan BT_DBG("sk %p, conn %p, err %d", sk, conn, err); 2140a708f8fSGustavo F. Padovan 2150a708f8fSGustavo F. Padovan if (conn) { 216baa7e1faSGustavo F. Padovan /* Delete from channel list */ 217baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 218baa7e1faSGustavo F. Padovan list_del(&chan->list); 219baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 220baa7e1faSGustavo F. Padovan __sock_put(sk); 221baa7e1faSGustavo F. Padovan 2220a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn = NULL; 2230a708f8fSGustavo F. Padovan hci_conn_put(conn->hcon); 2240a708f8fSGustavo F. Padovan } 2250a708f8fSGustavo F. Padovan 2260a708f8fSGustavo F. Padovan sk->sk_state = BT_CLOSED; 2270a708f8fSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 2280a708f8fSGustavo F. Padovan 2290a708f8fSGustavo F. Padovan if (err) 2300a708f8fSGustavo F. Padovan sk->sk_err = err; 2310a708f8fSGustavo F. Padovan 2320a708f8fSGustavo F. Padovan if (parent) { 2330a708f8fSGustavo F. Padovan bt_accept_unlink(sk); 2340a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 2350a708f8fSGustavo F. Padovan } else 2360a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 2370a708f8fSGustavo F. Padovan 2380a708f8fSGustavo F. Padovan skb_queue_purge(TX_QUEUE(sk)); 2390a708f8fSGustavo F. Padovan 2400a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { 2410a708f8fSGustavo F. Padovan struct srej_list *l, *tmp; 2420a708f8fSGustavo F. Padovan 2430a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->retrans_timer); 2440a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->monitor_timer); 2450a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->ack_timer); 2460a708f8fSGustavo F. Padovan 2470a708f8fSGustavo F. Padovan skb_queue_purge(SREJ_QUEUE(sk)); 2480a708f8fSGustavo F. Padovan skb_queue_purge(BUSY_QUEUE(sk)); 2490a708f8fSGustavo F. Padovan 2500a708f8fSGustavo F. Padovan list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { 2510a708f8fSGustavo F. Padovan list_del(&l->list); 2520a708f8fSGustavo F. Padovan kfree(l); 2530a708f8fSGustavo F. Padovan } 2540a708f8fSGustavo F. Padovan } 25548454079SGustavo F. Padovan 25648454079SGustavo F. Padovan kfree(chan); 2570a708f8fSGustavo F. Padovan } 2580a708f8fSGustavo F. Padovan 2590a708f8fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct sock *sk) 2600a708f8fSGustavo F. Padovan { 2610a708f8fSGustavo F. Padovan if (sk->sk_type == SOCK_RAW) { 2620a708f8fSGustavo F. Padovan switch (l2cap_pi(sk)->sec_level) { 2630a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 2640a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 2650a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 2660a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 2670a708f8fSGustavo F. Padovan default: 2680a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 2690a708f8fSGustavo F. Padovan } 2700a708f8fSGustavo F. Padovan } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { 2710a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) 2720a708f8fSGustavo F. Padovan l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; 2730a708f8fSGustavo F. Padovan 2740a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) 2750a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 2760a708f8fSGustavo F. Padovan else 2770a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 2780a708f8fSGustavo F. Padovan } else { 2790a708f8fSGustavo F. Padovan switch (l2cap_pi(sk)->sec_level) { 2800a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 2810a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 2820a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 2830a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 2840a708f8fSGustavo F. Padovan default: 2850a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 2860a708f8fSGustavo F. Padovan } 2870a708f8fSGustavo F. Padovan } 2880a708f8fSGustavo F. Padovan } 2890a708f8fSGustavo F. Padovan 2900a708f8fSGustavo F. Padovan /* Service level security */ 2910a708f8fSGustavo F. Padovan static inline int l2cap_check_security(struct sock *sk) 2920a708f8fSGustavo F. Padovan { 2930a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 2940a708f8fSGustavo F. Padovan __u8 auth_type; 2950a708f8fSGustavo F. Padovan 2960a708f8fSGustavo F. Padovan auth_type = l2cap_get_auth_type(sk); 2970a708f8fSGustavo F. Padovan 2980a708f8fSGustavo F. Padovan return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, 2990a708f8fSGustavo F. Padovan auth_type); 3000a708f8fSGustavo F. Padovan } 3010a708f8fSGustavo F. Padovan 30268983259SGustavo F. Padovan u8 l2cap_get_ident(struct l2cap_conn *conn) 3030a708f8fSGustavo F. Padovan { 3040a708f8fSGustavo F. Padovan u8 id; 3050a708f8fSGustavo F. Padovan 3060a708f8fSGustavo F. Padovan /* Get next available identificator. 3070a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 3080a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 3090a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 3100a708f8fSGustavo F. Padovan */ 3110a708f8fSGustavo F. Padovan 3120a708f8fSGustavo F. Padovan spin_lock_bh(&conn->lock); 3130a708f8fSGustavo F. Padovan 3140a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 3150a708f8fSGustavo F. Padovan conn->tx_ident = 1; 3160a708f8fSGustavo F. Padovan 3170a708f8fSGustavo F. Padovan id = conn->tx_ident; 3180a708f8fSGustavo F. Padovan 3190a708f8fSGustavo F. Padovan spin_unlock_bh(&conn->lock); 3200a708f8fSGustavo F. Padovan 3210a708f8fSGustavo F. Padovan return id; 3220a708f8fSGustavo F. Padovan } 3230a708f8fSGustavo F. Padovan 32468983259SGustavo F. Padovan void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) 3250a708f8fSGustavo F. Padovan { 3260a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 3270a708f8fSGustavo F. Padovan u8 flags; 3280a708f8fSGustavo F. Padovan 3290a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 3300a708f8fSGustavo F. Padovan 3310a708f8fSGustavo F. Padovan if (!skb) 3320a708f8fSGustavo F. Padovan return; 3330a708f8fSGustavo F. Padovan 3340a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 3350a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 3360a708f8fSGustavo F. Padovan else 3370a708f8fSGustavo F. Padovan flags = ACL_START; 3380a708f8fSGustavo F. Padovan 3390a708f8fSGustavo F. Padovan hci_send_acl(conn->hcon, skb, flags); 3400a708f8fSGustavo F. Padovan } 3410a708f8fSGustavo F. Padovan 3420a708f8fSGustavo F. Padovan static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) 3430a708f8fSGustavo F. Padovan { 3440a708f8fSGustavo F. Padovan struct sk_buff *skb; 3450a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 3460a708f8fSGustavo F. Padovan struct l2cap_conn *conn = pi->conn; 3470a708f8fSGustavo F. Padovan struct sock *sk = (struct sock *)pi; 3480a708f8fSGustavo F. Padovan int count, hlen = L2CAP_HDR_SIZE + 2; 3490a708f8fSGustavo F. Padovan u8 flags; 3500a708f8fSGustavo F. Padovan 3510a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 3520a708f8fSGustavo F. Padovan return; 3530a708f8fSGustavo F. Padovan 3540a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) 3550a708f8fSGustavo F. Padovan hlen += 2; 3560a708f8fSGustavo F. Padovan 3570a708f8fSGustavo F. Padovan BT_DBG("pi %p, control 0x%2.2x", pi, control); 3580a708f8fSGustavo F. Padovan 3590a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, hlen); 3600a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FRAME_TYPE; 3610a708f8fSGustavo F. Padovan 3620a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { 3630a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 3640a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; 3650a708f8fSGustavo F. Padovan } 3660a708f8fSGustavo F. Padovan 3670a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { 3680a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_POLL; 3690a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; 3700a708f8fSGustavo F. Padovan } 3710a708f8fSGustavo F. Padovan 3720a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 3730a708f8fSGustavo F. Padovan if (!skb) 3740a708f8fSGustavo F. Padovan return; 3750a708f8fSGustavo F. Padovan 3760a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 3770a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 3780a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(pi->dcid); 3790a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 3800a708f8fSGustavo F. Padovan 3810a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 3820a708f8fSGustavo F. Padovan u16 fcs = crc16(0, (u8 *)lh, count - 2); 3830a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb_put(skb, 2)); 3840a708f8fSGustavo F. Padovan } 3850a708f8fSGustavo F. Padovan 3860a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 3870a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 3880a708f8fSGustavo F. Padovan else 3890a708f8fSGustavo F. Padovan flags = ACL_START; 3900a708f8fSGustavo F. Padovan 3910a708f8fSGustavo F. Padovan hci_send_acl(pi->conn->hcon, skb, flags); 3920a708f8fSGustavo F. Padovan } 3930a708f8fSGustavo F. Padovan 3940a708f8fSGustavo F. Padovan static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) 3950a708f8fSGustavo F. Padovan { 3960a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { 3970a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 3980a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_RNR_SENT; 3990a708f8fSGustavo F. Padovan } else 4000a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 4010a708f8fSGustavo F. Padovan 4020a708f8fSGustavo F. Padovan control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 4030a708f8fSGustavo F. Padovan 4040a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 4050a708f8fSGustavo F. Padovan } 4060a708f8fSGustavo F. Padovan 4070a708f8fSGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct sock *sk) 4080a708f8fSGustavo F. Padovan { 4090a708f8fSGustavo F. Padovan return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); 4100a708f8fSGustavo F. Padovan } 4110a708f8fSGustavo F. Padovan 412fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 4130a708f8fSGustavo F. Padovan { 414fc7f8a7eSGustavo F. Padovan struct sock *sk = chan->sk; 4150a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 4160a708f8fSGustavo F. Padovan 4170a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 4180a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 4190a708f8fSGustavo F. Padovan return; 4200a708f8fSGustavo F. Padovan 4210a708f8fSGustavo F. Padovan if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { 4220a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 4230a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 4240a708f8fSGustavo F. Padovan req.psm = l2cap_pi(sk)->psm; 4250a708f8fSGustavo F. Padovan 426fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 4270a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 4280a708f8fSGustavo F. Padovan 429fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 430fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 4310a708f8fSGustavo F. Padovan } 4320a708f8fSGustavo F. Padovan } else { 4330a708f8fSGustavo F. Padovan struct l2cap_info_req req; 4340a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 4350a708f8fSGustavo F. Padovan 4360a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 4370a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 4380a708f8fSGustavo F. Padovan 4390a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 4400a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 4410a708f8fSGustavo F. Padovan 4420a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 4430a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 4440a708f8fSGustavo F. Padovan } 4450a708f8fSGustavo F. Padovan } 4460a708f8fSGustavo F. Padovan 4470a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 4480a708f8fSGustavo F. Padovan { 4490a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 4500a708f8fSGustavo F. Padovan if (!disable_ertm) 4510a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 4520a708f8fSGustavo F. Padovan 4530a708f8fSGustavo F. Padovan switch (mode) { 4540a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 4550a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 4560a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 4570a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 4580a708f8fSGustavo F. Padovan default: 4590a708f8fSGustavo F. Padovan return 0x00; 4600a708f8fSGustavo F. Padovan } 4610a708f8fSGustavo F. Padovan } 4620a708f8fSGustavo F. Padovan 4636de0702bSGustavo F. Padovan void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) 4640a708f8fSGustavo F. Padovan { 4650a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 4660a708f8fSGustavo F. Padovan 4670a708f8fSGustavo F. Padovan if (!conn) 4680a708f8fSGustavo F. Padovan return; 4690a708f8fSGustavo F. Padovan 4700a708f8fSGustavo F. Padovan skb_queue_purge(TX_QUEUE(sk)); 4710a708f8fSGustavo F. Padovan 4720a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { 4730a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->retrans_timer); 4740a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->monitor_timer); 4750a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->ack_timer); 4760a708f8fSGustavo F. Padovan } 4770a708f8fSGustavo F. Padovan 4780a708f8fSGustavo F. Padovan req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); 4790a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 4800a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 4810a708f8fSGustavo F. Padovan L2CAP_DISCONN_REQ, sizeof(req), &req); 4820a708f8fSGustavo F. Padovan 4830a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 4840a708f8fSGustavo F. Padovan sk->sk_err = err; 4850a708f8fSGustavo F. Padovan } 4860a708f8fSGustavo F. Padovan 4870a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 4880a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 4890a708f8fSGustavo F. Padovan { 490820ffdb3SGustavo F. Padovan struct l2cap_chan *chan, *tmp; 4910a708f8fSGustavo F. Padovan 4920a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 4930a708f8fSGustavo F. Padovan 494baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 4950a708f8fSGustavo F. Padovan 496820ffdb3SGustavo F. Padovan list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 49748454079SGustavo F. Padovan struct sock *sk = chan->sk; 498baa7e1faSGustavo F. Padovan 4990a708f8fSGustavo F. Padovan bh_lock_sock(sk); 5000a708f8fSGustavo F. Padovan 5010a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && 5020a708f8fSGustavo F. Padovan sk->sk_type != SOCK_STREAM) { 5030a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5040a708f8fSGustavo F. Padovan continue; 5050a708f8fSGustavo F. Padovan } 5060a708f8fSGustavo F. Padovan 5070a708f8fSGustavo F. Padovan if (sk->sk_state == BT_CONNECT) { 5080a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 5090a708f8fSGustavo F. Padovan 5100a708f8fSGustavo F. Padovan if (!l2cap_check_security(sk) || 5110a708f8fSGustavo F. Padovan !__l2cap_no_conn_pending(sk)) { 5120a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5130a708f8fSGustavo F. Padovan continue; 5140a708f8fSGustavo F. Padovan } 5150a708f8fSGustavo F. Padovan 5160a708f8fSGustavo F. Padovan if (!l2cap_mode_supported(l2cap_pi(sk)->mode, 5170a708f8fSGustavo F. Padovan conn->feat_mask) 5180a708f8fSGustavo F. Padovan && l2cap_pi(sk)->conf_state & 5190a708f8fSGustavo F. Padovan L2CAP_CONF_STATE2_DEVICE) { 520820ffdb3SGustavo F. Padovan /* __l2cap_sock_close() calls list_del(chan) 521820ffdb3SGustavo F. Padovan * so release the lock */ 522820ffdb3SGustavo F. Padovan read_unlock_bh(&conn->chan_lock); 523820ffdb3SGustavo F. Padovan __l2cap_sock_close(sk, ECONNRESET); 524820ffdb3SGustavo F. Padovan read_lock_bh(&conn->chan_lock); 5250a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5260a708f8fSGustavo F. Padovan continue; 5270a708f8fSGustavo F. Padovan } 5280a708f8fSGustavo F. Padovan 5290a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 5300a708f8fSGustavo F. Padovan req.psm = l2cap_pi(sk)->psm; 5310a708f8fSGustavo F. Padovan 532fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 5330a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 5340a708f8fSGustavo F. Padovan 535fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 536fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 5370a708f8fSGustavo F. Padovan 5380a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT2) { 5390a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 5400a708f8fSGustavo F. Padovan char buf[128]; 5410a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 5420a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 5430a708f8fSGustavo F. Padovan 5440a708f8fSGustavo F. Padovan if (l2cap_check_security(sk)) { 5450a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 5460a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 5470a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 5480a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 5490a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 5500a708f8fSGustavo F. Padovan 5510a708f8fSGustavo F. Padovan } else { 5520a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 5530a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 5540a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 5550a708f8fSGustavo F. Padovan } 5560a708f8fSGustavo F. Padovan } else { 5570a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 5580a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 5590a708f8fSGustavo F. Padovan } 5600a708f8fSGustavo F. Padovan 561fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 562fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 5630a708f8fSGustavo F. Padovan 5640a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || 5650a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 5660a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5670a708f8fSGustavo F. Padovan continue; 5680a708f8fSGustavo F. Padovan } 5690a708f8fSGustavo F. Padovan 5700a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 5710a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 5720a708f8fSGustavo F. Padovan l2cap_build_conf_req(sk, buf), buf); 5730a708f8fSGustavo F. Padovan l2cap_pi(sk)->num_conf_req++; 5740a708f8fSGustavo F. Padovan } 5750a708f8fSGustavo F. Padovan 5760a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5770a708f8fSGustavo F. Padovan } 5780a708f8fSGustavo F. Padovan 579baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 5800a708f8fSGustavo F. Padovan } 5810a708f8fSGustavo F. Padovan 582b62f328bSVille Tervo /* Find socket with cid and source bdaddr. 583b62f328bSVille Tervo * Returns closest match, locked. 584b62f328bSVille Tervo */ 585b62f328bSVille Tervo static struct sock *l2cap_get_sock_by_scid(int state, __le16 cid, bdaddr_t *src) 586b62f328bSVille Tervo { 587b62f328bSVille Tervo struct sock *s, *sk = NULL, *sk1 = NULL; 588b62f328bSVille Tervo struct hlist_node *node; 589b62f328bSVille Tervo 590b62f328bSVille Tervo read_lock(&l2cap_sk_list.lock); 591b62f328bSVille Tervo 592b62f328bSVille Tervo sk_for_each(sk, node, &l2cap_sk_list.head) { 593b62f328bSVille Tervo if (state && sk->sk_state != state) 594b62f328bSVille Tervo continue; 595b62f328bSVille Tervo 596b62f328bSVille Tervo if (l2cap_pi(sk)->scid == cid) { 597b62f328bSVille Tervo /* Exact match. */ 598b62f328bSVille Tervo if (!bacmp(&bt_sk(sk)->src, src)) 599b62f328bSVille Tervo break; 600b62f328bSVille Tervo 601b62f328bSVille Tervo /* Closest match */ 602b62f328bSVille Tervo if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 603b62f328bSVille Tervo sk1 = sk; 604b62f328bSVille Tervo } 605b62f328bSVille Tervo } 606b62f328bSVille Tervo s = node ? sk : sk1; 607b62f328bSVille Tervo if (s) 608b62f328bSVille Tervo bh_lock_sock(s); 609b62f328bSVille Tervo read_unlock(&l2cap_sk_list.lock); 610b62f328bSVille Tervo 611b62f328bSVille Tervo return s; 612b62f328bSVille Tervo } 613b62f328bSVille Tervo 614b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 615b62f328bSVille Tervo { 616b62f328bSVille Tervo struct sock *parent, *uninitialized_var(sk); 61748454079SGustavo F. Padovan struct l2cap_chan *chan; 618b62f328bSVille Tervo 619b62f328bSVille Tervo BT_DBG(""); 620b62f328bSVille Tervo 621b62f328bSVille Tervo /* Check if we have socket listening on cid */ 622b62f328bSVille Tervo parent = l2cap_get_sock_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, 623b62f328bSVille Tervo conn->src); 624b62f328bSVille Tervo if (!parent) 625b62f328bSVille Tervo return; 626b62f328bSVille Tervo 627b62f328bSVille Tervo /* Check for backlog size */ 628b62f328bSVille Tervo if (sk_acceptq_is_full(parent)) { 629b62f328bSVille Tervo BT_DBG("backlog full %d", parent->sk_ack_backlog); 630b62f328bSVille Tervo goto clean; 631b62f328bSVille Tervo } 632b62f328bSVille Tervo 633b62f328bSVille Tervo sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); 634b62f328bSVille Tervo if (!sk) 635b62f328bSVille Tervo goto clean; 636b62f328bSVille Tervo 63748454079SGustavo F. Padovan chan = l2cap_chan_alloc(sk); 63848454079SGustavo F. Padovan if (!chan) { 63948454079SGustavo F. Padovan l2cap_sock_kill(sk); 64048454079SGustavo F. Padovan goto clean; 64148454079SGustavo F. Padovan } 64248454079SGustavo F. Padovan 643baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 644b62f328bSVille Tervo 645b62f328bSVille Tervo hci_conn_hold(conn->hcon); 646b62f328bSVille Tervo 647b62f328bSVille Tervo l2cap_sock_init(sk, parent); 648baa7e1faSGustavo F. Padovan 649b62f328bSVille Tervo bacpy(&bt_sk(sk)->src, conn->src); 650b62f328bSVille Tervo bacpy(&bt_sk(sk)->dst, conn->dst); 651b62f328bSVille Tervo 652d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 653d1010240SGustavo F. Padovan 65448454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 65548454079SGustavo F. Padovan 65648454079SGustavo F. Padovan l2cap_pi(sk)->chan = chan; 657b62f328bSVille Tervo 658b62f328bSVille Tervo l2cap_sock_set_timer(sk, sk->sk_sndtimeo); 659b62f328bSVille Tervo 660b62f328bSVille Tervo sk->sk_state = BT_CONNECTED; 661b62f328bSVille Tervo parent->sk_data_ready(parent, 0); 662b62f328bSVille Tervo 663baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 664b62f328bSVille Tervo 665b62f328bSVille Tervo clean: 666b62f328bSVille Tervo bh_unlock_sock(parent); 667b62f328bSVille Tervo } 668b62f328bSVille Tervo 6690a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 6700a708f8fSGustavo F. Padovan { 67148454079SGustavo F. Padovan struct l2cap_chan *chan; 6720a708f8fSGustavo F. Padovan 6730a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 6740a708f8fSGustavo F. Padovan 675b62f328bSVille Tervo if (!conn->hcon->out && conn->hcon->type == LE_LINK) 676b62f328bSVille Tervo l2cap_le_conn_ready(conn); 677b62f328bSVille Tervo 678baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 6790a708f8fSGustavo F. Padovan 680baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 68148454079SGustavo F. Padovan struct sock *sk = chan->sk; 682baa7e1faSGustavo F. Padovan 6830a708f8fSGustavo F. Padovan bh_lock_sock(sk); 6840a708f8fSGustavo F. Padovan 685acd7d370SVille Tervo if (conn->hcon->type == LE_LINK) { 686acd7d370SVille Tervo l2cap_sock_clear_timer(sk); 687acd7d370SVille Tervo sk->sk_state = BT_CONNECTED; 688acd7d370SVille Tervo sk->sk_state_change(sk); 689acd7d370SVille Tervo } 690acd7d370SVille Tervo 6910a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && 6920a708f8fSGustavo F. Padovan sk->sk_type != SOCK_STREAM) { 6930a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 6940a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 6950a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 6960a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT) 697fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 6980a708f8fSGustavo F. Padovan 6990a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7000a708f8fSGustavo F. Padovan } 7010a708f8fSGustavo F. Padovan 702baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 7030a708f8fSGustavo F. Padovan } 7040a708f8fSGustavo F. Padovan 7050a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 7060a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 7070a708f8fSGustavo F. Padovan { 70848454079SGustavo F. Padovan struct l2cap_chan *chan; 7090a708f8fSGustavo F. Padovan 7100a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 7110a708f8fSGustavo F. Padovan 712baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 7130a708f8fSGustavo F. Padovan 714baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 71548454079SGustavo F. Padovan struct sock *sk = chan->sk; 716baa7e1faSGustavo F. Padovan 7170a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->force_reliable) 7180a708f8fSGustavo F. Padovan sk->sk_err = err; 7190a708f8fSGustavo F. Padovan } 7200a708f8fSGustavo F. Padovan 721baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 7220a708f8fSGustavo F. Padovan } 7230a708f8fSGustavo F. Padovan 7240a708f8fSGustavo F. Padovan static void l2cap_info_timeout(unsigned long arg) 7250a708f8fSGustavo F. Padovan { 7260a708f8fSGustavo F. Padovan struct l2cap_conn *conn = (void *) arg; 7270a708f8fSGustavo F. Padovan 7280a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 7290a708f8fSGustavo F. Padovan conn->info_ident = 0; 7300a708f8fSGustavo F. Padovan 7310a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 7320a708f8fSGustavo F. Padovan } 7330a708f8fSGustavo F. Padovan 7340a708f8fSGustavo F. Padovan static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) 7350a708f8fSGustavo F. Padovan { 7360a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 7370a708f8fSGustavo F. Padovan 7380a708f8fSGustavo F. Padovan if (conn || status) 7390a708f8fSGustavo F. Padovan return conn; 7400a708f8fSGustavo F. Padovan 7410a708f8fSGustavo F. Padovan conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); 7420a708f8fSGustavo F. Padovan if (!conn) 7430a708f8fSGustavo F. Padovan return NULL; 7440a708f8fSGustavo F. Padovan 7450a708f8fSGustavo F. Padovan hcon->l2cap_data = conn; 7460a708f8fSGustavo F. Padovan conn->hcon = hcon; 7470a708f8fSGustavo F. Padovan 7480a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p", hcon, conn); 7490a708f8fSGustavo F. Padovan 750acd7d370SVille Tervo if (hcon->hdev->le_mtu && hcon->type == LE_LINK) 751acd7d370SVille Tervo conn->mtu = hcon->hdev->le_mtu; 752acd7d370SVille Tervo else 7530a708f8fSGustavo F. Padovan conn->mtu = hcon->hdev->acl_mtu; 754acd7d370SVille Tervo 7550a708f8fSGustavo F. Padovan conn->src = &hcon->hdev->bdaddr; 7560a708f8fSGustavo F. Padovan conn->dst = &hcon->dst; 7570a708f8fSGustavo F. Padovan 7580a708f8fSGustavo F. Padovan conn->feat_mask = 0; 7590a708f8fSGustavo F. Padovan 7600a708f8fSGustavo F. Padovan spin_lock_init(&conn->lock); 761baa7e1faSGustavo F. Padovan rwlock_init(&conn->chan_lock); 762baa7e1faSGustavo F. Padovan 763baa7e1faSGustavo F. Padovan INIT_LIST_HEAD(&conn->chan_l); 7640a708f8fSGustavo F. Padovan 765b62f328bSVille Tervo if (hcon->type != LE_LINK) 7660a708f8fSGustavo F. Padovan setup_timer(&conn->info_timer, l2cap_info_timeout, 7670a708f8fSGustavo F. Padovan (unsigned long) conn); 7680a708f8fSGustavo F. Padovan 7690a708f8fSGustavo F. Padovan conn->disc_reason = 0x13; 7700a708f8fSGustavo F. Padovan 7710a708f8fSGustavo F. Padovan return conn; 7720a708f8fSGustavo F. Padovan } 7730a708f8fSGustavo F. Padovan 7740a708f8fSGustavo F. Padovan static void l2cap_conn_del(struct hci_conn *hcon, int err) 7750a708f8fSGustavo F. Padovan { 7760a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 777baa7e1faSGustavo F. Padovan struct l2cap_chan *chan, *l; 7780a708f8fSGustavo F. Padovan struct sock *sk; 7790a708f8fSGustavo F. Padovan 7800a708f8fSGustavo F. Padovan if (!conn) 7810a708f8fSGustavo F. Padovan return; 7820a708f8fSGustavo F. Padovan 7830a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 7840a708f8fSGustavo F. Padovan 7850a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 7860a708f8fSGustavo F. Padovan 7870a708f8fSGustavo F. Padovan /* Kill channels */ 788baa7e1faSGustavo F. Padovan list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 78948454079SGustavo F. Padovan sk = chan->sk; 7900a708f8fSGustavo F. Padovan bh_lock_sock(sk); 79148454079SGustavo F. Padovan l2cap_chan_del(chan, err); 7920a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7930a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 7940a708f8fSGustavo F. Padovan } 7950a708f8fSGustavo F. Padovan 7960a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 7970a708f8fSGustavo F. Padovan del_timer_sync(&conn->info_timer); 7980a708f8fSGustavo F. Padovan 7990a708f8fSGustavo F. Padovan hcon->l2cap_data = NULL; 8000a708f8fSGustavo F. Padovan kfree(conn); 8010a708f8fSGustavo F. Padovan } 8020a708f8fSGustavo F. Padovan 80348454079SGustavo F. Padovan static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 8040a708f8fSGustavo F. Padovan { 805baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 80648454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 807baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 8080a708f8fSGustavo F. Padovan } 8090a708f8fSGustavo F. Padovan 8100a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 8110a708f8fSGustavo F. Padovan 8120a708f8fSGustavo F. Padovan /* Find socket with psm and source bdaddr. 8130a708f8fSGustavo F. Padovan * Returns closest match. 8140a708f8fSGustavo F. Padovan */ 8150a708f8fSGustavo F. Padovan static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) 8160a708f8fSGustavo F. Padovan { 8170a708f8fSGustavo F. Padovan struct sock *sk = NULL, *sk1 = NULL; 8180a708f8fSGustavo F. Padovan struct hlist_node *node; 8190a708f8fSGustavo F. Padovan 8200a708f8fSGustavo F. Padovan read_lock(&l2cap_sk_list.lock); 8210a708f8fSGustavo F. Padovan 8220a708f8fSGustavo F. Padovan sk_for_each(sk, node, &l2cap_sk_list.head) { 8230a708f8fSGustavo F. Padovan if (state && sk->sk_state != state) 8240a708f8fSGustavo F. Padovan continue; 8250a708f8fSGustavo F. Padovan 8260a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->psm == psm) { 8270a708f8fSGustavo F. Padovan /* Exact match. */ 8280a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, src)) 8290a708f8fSGustavo F. Padovan break; 8300a708f8fSGustavo F. Padovan 8310a708f8fSGustavo F. Padovan /* Closest match */ 8320a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 8330a708f8fSGustavo F. Padovan sk1 = sk; 8340a708f8fSGustavo F. Padovan } 8350a708f8fSGustavo F. Padovan } 8360a708f8fSGustavo F. Padovan 8370a708f8fSGustavo F. Padovan read_unlock(&l2cap_sk_list.lock); 8380a708f8fSGustavo F. Padovan 8390a708f8fSGustavo F. Padovan return node ? sk : sk1; 8400a708f8fSGustavo F. Padovan } 8410a708f8fSGustavo F. Padovan 8424e34c50bSGustavo F. Padovan int l2cap_do_connect(struct sock *sk) 8430a708f8fSGustavo F. Padovan { 8440a708f8fSGustavo F. Padovan bdaddr_t *src = &bt_sk(sk)->src; 8450a708f8fSGustavo F. Padovan bdaddr_t *dst = &bt_sk(sk)->dst; 8460a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 84748454079SGustavo F. Padovan struct l2cap_chan *chan; 8480a708f8fSGustavo F. Padovan struct hci_conn *hcon; 8490a708f8fSGustavo F. Padovan struct hci_dev *hdev; 8500a708f8fSGustavo F. Padovan __u8 auth_type; 8510a708f8fSGustavo F. Padovan int err; 8520a708f8fSGustavo F. Padovan 8530a708f8fSGustavo F. Padovan BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), 8540a708f8fSGustavo F. Padovan l2cap_pi(sk)->psm); 8550a708f8fSGustavo F. Padovan 8560a708f8fSGustavo F. Padovan hdev = hci_get_route(dst, src); 8570a708f8fSGustavo F. Padovan if (!hdev) 8580a708f8fSGustavo F. Padovan return -EHOSTUNREACH; 8590a708f8fSGustavo F. Padovan 8600a708f8fSGustavo F. Padovan hci_dev_lock_bh(hdev); 8610a708f8fSGustavo F. Padovan 8620a708f8fSGustavo F. Padovan auth_type = l2cap_get_auth_type(sk); 8630a708f8fSGustavo F. Padovan 864acd7d370SVille Tervo if (l2cap_pi(sk)->dcid == L2CAP_CID_LE_DATA) 865acd7d370SVille Tervo hcon = hci_connect(hdev, LE_LINK, dst, 866acd7d370SVille Tervo l2cap_pi(sk)->sec_level, auth_type); 867acd7d370SVille Tervo else 8680a708f8fSGustavo F. Padovan hcon = hci_connect(hdev, ACL_LINK, dst, 8690a708f8fSGustavo F. Padovan l2cap_pi(sk)->sec_level, auth_type); 870acd7d370SVille Tervo 87130e76272SVille Tervo if (IS_ERR(hcon)) { 87230e76272SVille Tervo err = PTR_ERR(hcon); 8730a708f8fSGustavo F. Padovan goto done; 87430e76272SVille Tervo } 8750a708f8fSGustavo F. Padovan 8760a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 8770a708f8fSGustavo F. Padovan if (!conn) { 8780a708f8fSGustavo F. Padovan hci_conn_put(hcon); 87930e76272SVille Tervo err = -ENOMEM; 8800a708f8fSGustavo F. Padovan goto done; 8810a708f8fSGustavo F. Padovan } 8820a708f8fSGustavo F. Padovan 88348454079SGustavo F. Padovan chan = l2cap_chan_alloc(sk); 88448454079SGustavo F. Padovan if (!chan) { 88548454079SGustavo F. Padovan hci_conn_put(hcon); 88648454079SGustavo F. Padovan err = -ENOMEM; 88748454079SGustavo F. Padovan goto done; 88848454079SGustavo F. Padovan } 88948454079SGustavo F. Padovan 8900a708f8fSGustavo F. Padovan /* Update source addr of the socket */ 8910a708f8fSGustavo F. Padovan bacpy(src, conn->src); 8920a708f8fSGustavo F. Padovan 89348454079SGustavo F. Padovan l2cap_chan_add(conn, chan); 89448454079SGustavo F. Padovan 89548454079SGustavo F. Padovan l2cap_pi(sk)->chan = chan; 8960a708f8fSGustavo F. Padovan 8970a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT; 8980a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, sk->sk_sndtimeo); 8990a708f8fSGustavo F. Padovan 9000a708f8fSGustavo F. Padovan if (hcon->state == BT_CONNECTED) { 9010a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && 9020a708f8fSGustavo F. Padovan sk->sk_type != SOCK_STREAM) { 9030a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 9040a708f8fSGustavo F. Padovan if (l2cap_check_security(sk)) 9050a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 9060a708f8fSGustavo F. Padovan } else 907fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 9080a708f8fSGustavo F. Padovan } 9090a708f8fSGustavo F. Padovan 91030e76272SVille Tervo err = 0; 91130e76272SVille Tervo 9120a708f8fSGustavo F. Padovan done: 9130a708f8fSGustavo F. Padovan hci_dev_unlock_bh(hdev); 9140a708f8fSGustavo F. Padovan hci_dev_put(hdev); 9150a708f8fSGustavo F. Padovan return err; 9160a708f8fSGustavo F. Padovan } 9170a708f8fSGustavo F. Padovan 918dcba0dbaSGustavo F. Padovan int __l2cap_wait_ack(struct sock *sk) 9190a708f8fSGustavo F. Padovan { 9200a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 9210a708f8fSGustavo F. Padovan int err = 0; 9220a708f8fSGustavo F. Padovan int timeo = HZ/5; 9230a708f8fSGustavo F. Padovan 9240a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 9250a708f8fSGustavo F. Padovan while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { 9260a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 9270a708f8fSGustavo F. Padovan 9280a708f8fSGustavo F. Padovan if (!timeo) 9290a708f8fSGustavo F. Padovan timeo = HZ/5; 9300a708f8fSGustavo F. Padovan 9310a708f8fSGustavo F. Padovan if (signal_pending(current)) { 9320a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 9330a708f8fSGustavo F. Padovan break; 9340a708f8fSGustavo F. Padovan } 9350a708f8fSGustavo F. Padovan 9360a708f8fSGustavo F. Padovan release_sock(sk); 9370a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 9380a708f8fSGustavo F. Padovan lock_sock(sk); 9390a708f8fSGustavo F. Padovan 9400a708f8fSGustavo F. Padovan err = sock_error(sk); 9410a708f8fSGustavo F. Padovan if (err) 9420a708f8fSGustavo F. Padovan break; 9430a708f8fSGustavo F. Padovan } 9440a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 9450a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 9460a708f8fSGustavo F. Padovan return err; 9470a708f8fSGustavo F. Padovan } 9480a708f8fSGustavo F. Padovan 9490a708f8fSGustavo F. Padovan static void l2cap_monitor_timeout(unsigned long arg) 9500a708f8fSGustavo F. Padovan { 9510a708f8fSGustavo F. Padovan struct sock *sk = (void *) arg; 9520a708f8fSGustavo F. Padovan 9530a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 9540a708f8fSGustavo F. Padovan 9550a708f8fSGustavo F. Padovan bh_lock_sock(sk); 9560a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { 9570a708f8fSGustavo F. Padovan l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); 9580a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9590a708f8fSGustavo F. Padovan return; 9600a708f8fSGustavo F. Padovan } 9610a708f8fSGustavo F. Padovan 9620a708f8fSGustavo F. Padovan l2cap_pi(sk)->retry_count++; 9630a708f8fSGustavo F. Padovan __mod_monitor_timer(); 9640a708f8fSGustavo F. Padovan 9650a708f8fSGustavo F. Padovan l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); 9660a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9670a708f8fSGustavo F. Padovan } 9680a708f8fSGustavo F. Padovan 9690a708f8fSGustavo F. Padovan static void l2cap_retrans_timeout(unsigned long arg) 9700a708f8fSGustavo F. Padovan { 9710a708f8fSGustavo F. Padovan struct sock *sk = (void *) arg; 9720a708f8fSGustavo F. Padovan 9730a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 9740a708f8fSGustavo F. Padovan 9750a708f8fSGustavo F. Padovan bh_lock_sock(sk); 9760a708f8fSGustavo F. Padovan l2cap_pi(sk)->retry_count = 1; 9770a708f8fSGustavo F. Padovan __mod_monitor_timer(); 9780a708f8fSGustavo F. Padovan 9790a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; 9800a708f8fSGustavo F. Padovan 9810a708f8fSGustavo F. Padovan l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); 9820a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9830a708f8fSGustavo F. Padovan } 9840a708f8fSGustavo F. Padovan 9850a708f8fSGustavo F. Padovan static void l2cap_drop_acked_frames(struct sock *sk) 9860a708f8fSGustavo F. Padovan { 9870a708f8fSGustavo F. Padovan struct sk_buff *skb; 9880a708f8fSGustavo F. Padovan 9890a708f8fSGustavo F. Padovan while ((skb = skb_peek(TX_QUEUE(sk))) && 9900a708f8fSGustavo F. Padovan l2cap_pi(sk)->unacked_frames) { 9910a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) 9920a708f8fSGustavo F. Padovan break; 9930a708f8fSGustavo F. Padovan 9940a708f8fSGustavo F. Padovan skb = skb_dequeue(TX_QUEUE(sk)); 9950a708f8fSGustavo F. Padovan kfree_skb(skb); 9960a708f8fSGustavo F. Padovan 9970a708f8fSGustavo F. Padovan l2cap_pi(sk)->unacked_frames--; 9980a708f8fSGustavo F. Padovan } 9990a708f8fSGustavo F. Padovan 10000a708f8fSGustavo F. Padovan if (!l2cap_pi(sk)->unacked_frames) 10010a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->retrans_timer); 10020a708f8fSGustavo F. Padovan } 10030a708f8fSGustavo F. Padovan 1004fd83ccdbSGustavo F. Padovan void l2cap_do_send(struct sock *sk, struct sk_buff *skb) 10050a708f8fSGustavo F. Padovan { 10060a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10070a708f8fSGustavo F. Padovan struct hci_conn *hcon = pi->conn->hcon; 10080a708f8fSGustavo F. Padovan u16 flags; 10090a708f8fSGustavo F. Padovan 10100a708f8fSGustavo F. Padovan BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); 10110a708f8fSGustavo F. Padovan 10120a708f8fSGustavo F. Padovan if (!pi->flushable && lmp_no_flush_capable(hcon->hdev)) 10130a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 10140a708f8fSGustavo F. Padovan else 10150a708f8fSGustavo F. Padovan flags = ACL_START; 10160a708f8fSGustavo F. Padovan 10170a708f8fSGustavo F. Padovan hci_send_acl(hcon, skb, flags); 10180a708f8fSGustavo F. Padovan } 10190a708f8fSGustavo F. Padovan 1020fd83ccdbSGustavo F. Padovan void l2cap_streaming_send(struct sock *sk) 10210a708f8fSGustavo F. Padovan { 10220a708f8fSGustavo F. Padovan struct sk_buff *skb; 10230a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10240a708f8fSGustavo F. Padovan u16 control, fcs; 10250a708f8fSGustavo F. Padovan 10260a708f8fSGustavo F. Padovan while ((skb = skb_dequeue(TX_QUEUE(sk)))) { 10270a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); 10280a708f8fSGustavo F. Padovan control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; 10290a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); 10300a708f8fSGustavo F. Padovan 10310a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 10320a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, skb->len - 2); 10330a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + skb->len - 2); 10340a708f8fSGustavo F. Padovan } 10350a708f8fSGustavo F. Padovan 10360a708f8fSGustavo F. Padovan l2cap_do_send(sk, skb); 10370a708f8fSGustavo F. Padovan 10380a708f8fSGustavo F. Padovan pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; 10390a708f8fSGustavo F. Padovan } 10400a708f8fSGustavo F. Padovan } 10410a708f8fSGustavo F. Padovan 10420a708f8fSGustavo F. Padovan static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) 10430a708f8fSGustavo F. Padovan { 10440a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10450a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 10460a708f8fSGustavo F. Padovan u16 control, fcs; 10470a708f8fSGustavo F. Padovan 10480a708f8fSGustavo F. Padovan skb = skb_peek(TX_QUEUE(sk)); 10490a708f8fSGustavo F. Padovan if (!skb) 10500a708f8fSGustavo F. Padovan return; 10510a708f8fSGustavo F. Padovan 10520a708f8fSGustavo F. Padovan do { 10530a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq == tx_seq) 10540a708f8fSGustavo F. Padovan break; 10550a708f8fSGustavo F. Padovan 10560a708f8fSGustavo F. Padovan if (skb_queue_is_last(TX_QUEUE(sk), skb)) 10570a708f8fSGustavo F. Padovan return; 10580a708f8fSGustavo F. Padovan 10590a708f8fSGustavo F. Padovan } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); 10600a708f8fSGustavo F. Padovan 10610a708f8fSGustavo F. Padovan if (pi->remote_max_tx && 10620a708f8fSGustavo F. Padovan bt_cb(skb)->retries == pi->remote_max_tx) { 10630a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); 10640a708f8fSGustavo F. Padovan return; 10650a708f8fSGustavo F. Padovan } 10660a708f8fSGustavo F. Padovan 10670a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 10680a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 10690a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 10700a708f8fSGustavo F. Padovan 10710a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { 10720a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 10730a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; 10740a708f8fSGustavo F. Padovan } 10750a708f8fSGustavo F. Padovan 10760a708f8fSGustavo F. Padovan control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 10770a708f8fSGustavo F. Padovan | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 10780a708f8fSGustavo F. Padovan 10790a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 10800a708f8fSGustavo F. Padovan 10810a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 10820a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); 10830a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); 10840a708f8fSGustavo F. Padovan } 10850a708f8fSGustavo F. Padovan 10860a708f8fSGustavo F. Padovan l2cap_do_send(sk, tx_skb); 10870a708f8fSGustavo F. Padovan } 10880a708f8fSGustavo F. Padovan 1089fd83ccdbSGustavo F. Padovan int l2cap_ertm_send(struct sock *sk) 10900a708f8fSGustavo F. Padovan { 10910a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 10920a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10930a708f8fSGustavo F. Padovan u16 control, fcs; 10940a708f8fSGustavo F. Padovan int nsent = 0; 10950a708f8fSGustavo F. Padovan 10960a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 10970a708f8fSGustavo F. Padovan return -ENOTCONN; 10980a708f8fSGustavo F. Padovan 10990a708f8fSGustavo F. Padovan while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { 11000a708f8fSGustavo F. Padovan 11010a708f8fSGustavo F. Padovan if (pi->remote_max_tx && 11020a708f8fSGustavo F. Padovan bt_cb(skb)->retries == pi->remote_max_tx) { 11030a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); 11040a708f8fSGustavo F. Padovan break; 11050a708f8fSGustavo F. Padovan } 11060a708f8fSGustavo F. Padovan 11070a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 11080a708f8fSGustavo F. Padovan 11090a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 11100a708f8fSGustavo F. Padovan 11110a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 11120a708f8fSGustavo F. Padovan control &= L2CAP_CTRL_SAR; 11130a708f8fSGustavo F. Padovan 11140a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { 11150a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 11160a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; 11170a708f8fSGustavo F. Padovan } 11180a708f8fSGustavo F. Padovan control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 11190a708f8fSGustavo F. Padovan | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 11200a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 11210a708f8fSGustavo F. Padovan 11220a708f8fSGustavo F. Padovan 11230a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 11240a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); 11250a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); 11260a708f8fSGustavo F. Padovan } 11270a708f8fSGustavo F. Padovan 11280a708f8fSGustavo F. Padovan l2cap_do_send(sk, tx_skb); 11290a708f8fSGustavo F. Padovan 11300a708f8fSGustavo F. Padovan __mod_retrans_timer(); 11310a708f8fSGustavo F. Padovan 11320a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = pi->next_tx_seq; 11330a708f8fSGustavo F. Padovan pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; 11340a708f8fSGustavo F. Padovan 113523e9fde2SSuraj Sumangala if (bt_cb(skb)->retries == 1) 11360a708f8fSGustavo F. Padovan pi->unacked_frames++; 113723e9fde2SSuraj Sumangala 11380a708f8fSGustavo F. Padovan pi->frames_sent++; 11390a708f8fSGustavo F. Padovan 11400a708f8fSGustavo F. Padovan if (skb_queue_is_last(TX_QUEUE(sk), skb)) 11410a708f8fSGustavo F. Padovan sk->sk_send_head = NULL; 11420a708f8fSGustavo F. Padovan else 11430a708f8fSGustavo F. Padovan sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); 11440a708f8fSGustavo F. Padovan 11450a708f8fSGustavo F. Padovan nsent++; 11460a708f8fSGustavo F. Padovan } 11470a708f8fSGustavo F. Padovan 11480a708f8fSGustavo F. Padovan return nsent; 11490a708f8fSGustavo F. Padovan } 11500a708f8fSGustavo F. Padovan 11510a708f8fSGustavo F. Padovan static int l2cap_retransmit_frames(struct sock *sk) 11520a708f8fSGustavo F. Padovan { 11530a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 11540a708f8fSGustavo F. Padovan int ret; 11550a708f8fSGustavo F. Padovan 11560a708f8fSGustavo F. Padovan if (!skb_queue_empty(TX_QUEUE(sk))) 11570a708f8fSGustavo F. Padovan sk->sk_send_head = TX_QUEUE(sk)->next; 11580a708f8fSGustavo F. Padovan 11590a708f8fSGustavo F. Padovan pi->next_tx_seq = pi->expected_ack_seq; 11600a708f8fSGustavo F. Padovan ret = l2cap_ertm_send(sk); 11610a708f8fSGustavo F. Padovan return ret; 11620a708f8fSGustavo F. Padovan } 11630a708f8fSGustavo F. Padovan 11640a708f8fSGustavo F. Padovan static void l2cap_send_ack(struct l2cap_pinfo *pi) 11650a708f8fSGustavo F. Padovan { 11660a708f8fSGustavo F. Padovan struct sock *sk = (struct sock *)pi; 11670a708f8fSGustavo F. Padovan u16 control = 0; 11680a708f8fSGustavo F. Padovan 11690a708f8fSGustavo F. Padovan control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 11700a708f8fSGustavo F. Padovan 11710a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { 11720a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 11730a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_RNR_SENT; 11740a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 11750a708f8fSGustavo F. Padovan return; 11760a708f8fSGustavo F. Padovan } 11770a708f8fSGustavo F. Padovan 11780a708f8fSGustavo F. Padovan if (l2cap_ertm_send(sk) > 0) 11790a708f8fSGustavo F. Padovan return; 11800a708f8fSGustavo F. Padovan 11810a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 11820a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 11830a708f8fSGustavo F. Padovan } 11840a708f8fSGustavo F. Padovan 11850a708f8fSGustavo F. Padovan static void l2cap_send_srejtail(struct sock *sk) 11860a708f8fSGustavo F. Padovan { 11870a708f8fSGustavo F. Padovan struct srej_list *tail; 11880a708f8fSGustavo F. Padovan u16 control; 11890a708f8fSGustavo F. Padovan 11900a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 11910a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 11920a708f8fSGustavo F. Padovan 11930a708f8fSGustavo F. Padovan tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); 11940a708f8fSGustavo F. Padovan control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 11950a708f8fSGustavo F. Padovan 11960a708f8fSGustavo F. Padovan l2cap_send_sframe(l2cap_pi(sk), control); 11970a708f8fSGustavo F. Padovan } 11980a708f8fSGustavo F. Padovan 11990a708f8fSGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) 12000a708f8fSGustavo F. Padovan { 12010a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12020a708f8fSGustavo F. Padovan struct sk_buff **frag; 12030a708f8fSGustavo F. Padovan int err, sent = 0; 12040a708f8fSGustavo F. Padovan 12050a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) 12060a708f8fSGustavo F. Padovan return -EFAULT; 12070a708f8fSGustavo F. Padovan 12080a708f8fSGustavo F. Padovan sent += count; 12090a708f8fSGustavo F. Padovan len -= count; 12100a708f8fSGustavo F. Padovan 12110a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 12120a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 12130a708f8fSGustavo F. Padovan while (len) { 12140a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 12150a708f8fSGustavo F. Padovan 12160a708f8fSGustavo F. Padovan *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); 12170a708f8fSGustavo F. Padovan if (!*frag) 12180a708f8fSGustavo F. Padovan return err; 12190a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) 12200a708f8fSGustavo F. Padovan return -EFAULT; 12210a708f8fSGustavo F. Padovan 12220a708f8fSGustavo F. Padovan sent += count; 12230a708f8fSGustavo F. Padovan len -= count; 12240a708f8fSGustavo F. Padovan 12250a708f8fSGustavo F. Padovan frag = &(*frag)->next; 12260a708f8fSGustavo F. Padovan } 12270a708f8fSGustavo F. Padovan 12280a708f8fSGustavo F. Padovan return sent; 12290a708f8fSGustavo F. Padovan } 12300a708f8fSGustavo F. Padovan 1231fd83ccdbSGustavo F. Padovan struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) 12320a708f8fSGustavo F. Padovan { 12330a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12340a708f8fSGustavo F. Padovan struct sk_buff *skb; 12350a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 12360a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 12370a708f8fSGustavo F. Padovan 12380a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 12390a708f8fSGustavo F. Padovan 12400a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 12410a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 12420a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 12430a708f8fSGustavo F. Padovan if (!skb) 12440a708f8fSGustavo F. Padovan return ERR_PTR(err); 12450a708f8fSGustavo F. Padovan 12460a708f8fSGustavo F. Padovan /* Create L2CAP header */ 12470a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 12480a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); 12490a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 12500a708f8fSGustavo F. Padovan put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); 12510a708f8fSGustavo F. Padovan 12520a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 12530a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 12540a708f8fSGustavo F. Padovan kfree_skb(skb); 12550a708f8fSGustavo F. Padovan return ERR_PTR(err); 12560a708f8fSGustavo F. Padovan } 12570a708f8fSGustavo F. Padovan return skb; 12580a708f8fSGustavo F. Padovan } 12590a708f8fSGustavo F. Padovan 1260fd83ccdbSGustavo F. Padovan struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) 12610a708f8fSGustavo F. Padovan { 12620a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12630a708f8fSGustavo F. Padovan struct sk_buff *skb; 12640a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE; 12650a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 12660a708f8fSGustavo F. Padovan 12670a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 12680a708f8fSGustavo F. Padovan 12690a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 12700a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 12710a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 12720a708f8fSGustavo F. Padovan if (!skb) 12730a708f8fSGustavo F. Padovan return ERR_PTR(err); 12740a708f8fSGustavo F. Padovan 12750a708f8fSGustavo F. Padovan /* Create L2CAP header */ 12760a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 12770a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); 12780a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 12790a708f8fSGustavo F. Padovan 12800a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 12810a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 12820a708f8fSGustavo F. Padovan kfree_skb(skb); 12830a708f8fSGustavo F. Padovan return ERR_PTR(err); 12840a708f8fSGustavo F. Padovan } 12850a708f8fSGustavo F. Padovan return skb; 12860a708f8fSGustavo F. Padovan } 12870a708f8fSGustavo F. Padovan 1288fd83ccdbSGustavo F. Padovan struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) 12890a708f8fSGustavo F. Padovan { 12900a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12910a708f8fSGustavo F. Padovan struct sk_buff *skb; 12920a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 12930a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 12940a708f8fSGustavo F. Padovan 12950a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 12960a708f8fSGustavo F. Padovan 12970a708f8fSGustavo F. Padovan if (!conn) 12980a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 12990a708f8fSGustavo F. Padovan 13000a708f8fSGustavo F. Padovan if (sdulen) 13010a708f8fSGustavo F. Padovan hlen += 2; 13020a708f8fSGustavo F. Padovan 13030a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) 13040a708f8fSGustavo F. Padovan hlen += 2; 13050a708f8fSGustavo F. Padovan 13060a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 13070a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 13080a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 13090a708f8fSGustavo F. Padovan if (!skb) 13100a708f8fSGustavo F. Padovan return ERR_PTR(err); 13110a708f8fSGustavo F. Padovan 13120a708f8fSGustavo F. Padovan /* Create L2CAP header */ 13130a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 13140a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); 13150a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 13160a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 13170a708f8fSGustavo F. Padovan if (sdulen) 13180a708f8fSGustavo F. Padovan put_unaligned_le16(sdulen, skb_put(skb, 2)); 13190a708f8fSGustavo F. Padovan 13200a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 13210a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 13220a708f8fSGustavo F. Padovan kfree_skb(skb); 13230a708f8fSGustavo F. Padovan return ERR_PTR(err); 13240a708f8fSGustavo F. Padovan } 13250a708f8fSGustavo F. Padovan 13260a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) 13270a708f8fSGustavo F. Padovan put_unaligned_le16(0, skb_put(skb, 2)); 13280a708f8fSGustavo F. Padovan 13290a708f8fSGustavo F. Padovan bt_cb(skb)->retries = 0; 13300a708f8fSGustavo F. Padovan return skb; 13310a708f8fSGustavo F. Padovan } 13320a708f8fSGustavo F. Padovan 1333fd83ccdbSGustavo F. Padovan int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) 13340a708f8fSGustavo F. Padovan { 13350a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 13360a708f8fSGustavo F. Padovan struct sk_buff *skb; 13370a708f8fSGustavo F. Padovan struct sk_buff_head sar_queue; 13380a708f8fSGustavo F. Padovan u16 control; 13390a708f8fSGustavo F. Padovan size_t size = 0; 13400a708f8fSGustavo F. Padovan 13410a708f8fSGustavo F. Padovan skb_queue_head_init(&sar_queue); 13420a708f8fSGustavo F. Padovan control = L2CAP_SDU_START; 13430a708f8fSGustavo F. Padovan skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); 13440a708f8fSGustavo F. Padovan if (IS_ERR(skb)) 13450a708f8fSGustavo F. Padovan return PTR_ERR(skb); 13460a708f8fSGustavo F. Padovan 13470a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 13480a708f8fSGustavo F. Padovan len -= pi->remote_mps; 13490a708f8fSGustavo F. Padovan size += pi->remote_mps; 13500a708f8fSGustavo F. Padovan 13510a708f8fSGustavo F. Padovan while (len > 0) { 13520a708f8fSGustavo F. Padovan size_t buflen; 13530a708f8fSGustavo F. Padovan 13540a708f8fSGustavo F. Padovan if (len > pi->remote_mps) { 13550a708f8fSGustavo F. Padovan control = L2CAP_SDU_CONTINUE; 13560a708f8fSGustavo F. Padovan buflen = pi->remote_mps; 13570a708f8fSGustavo F. Padovan } else { 13580a708f8fSGustavo F. Padovan control = L2CAP_SDU_END; 13590a708f8fSGustavo F. Padovan buflen = len; 13600a708f8fSGustavo F. Padovan } 13610a708f8fSGustavo F. Padovan 13620a708f8fSGustavo F. Padovan skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); 13630a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 13640a708f8fSGustavo F. Padovan skb_queue_purge(&sar_queue); 13650a708f8fSGustavo F. Padovan return PTR_ERR(skb); 13660a708f8fSGustavo F. Padovan } 13670a708f8fSGustavo F. Padovan 13680a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 13690a708f8fSGustavo F. Padovan len -= buflen; 13700a708f8fSGustavo F. Padovan size += buflen; 13710a708f8fSGustavo F. Padovan } 13720a708f8fSGustavo F. Padovan skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); 13730a708f8fSGustavo F. Padovan if (sk->sk_send_head == NULL) 13740a708f8fSGustavo F. Padovan sk->sk_send_head = sar_queue.next; 13750a708f8fSGustavo F. Padovan 13760a708f8fSGustavo F. Padovan return size; 13770a708f8fSGustavo F. Padovan } 13780a708f8fSGustavo F. Padovan 13790a708f8fSGustavo F. Padovan static void l2cap_chan_ready(struct sock *sk) 13800a708f8fSGustavo F. Padovan { 13810a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 13820a708f8fSGustavo F. Padovan 13830a708f8fSGustavo F. Padovan BT_DBG("sk %p, parent %p", sk, parent); 13840a708f8fSGustavo F. Padovan 13850a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state = 0; 13860a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 13870a708f8fSGustavo F. Padovan 13880a708f8fSGustavo F. Padovan if (!parent) { 13890a708f8fSGustavo F. Padovan /* Outgoing channel. 13900a708f8fSGustavo F. Padovan * Wake up socket sleeping on connect. 13910a708f8fSGustavo F. Padovan */ 13920a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 13930a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 13940a708f8fSGustavo F. Padovan } else { 13950a708f8fSGustavo F. Padovan /* Incoming channel. 13960a708f8fSGustavo F. Padovan * Wake up socket sleeping on accept. 13970a708f8fSGustavo F. Padovan */ 13980a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 13990a708f8fSGustavo F. Padovan } 14000a708f8fSGustavo F. Padovan } 14010a708f8fSGustavo F. Padovan 14020a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 14030a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 14040a708f8fSGustavo F. Padovan { 14050a708f8fSGustavo F. Padovan struct sk_buff *nskb; 140648454079SGustavo F. Padovan struct l2cap_chan *chan; 14070a708f8fSGustavo F. Padovan 14080a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 14090a708f8fSGustavo F. Padovan 1410baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 1411baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 141248454079SGustavo F. Padovan struct sock *sk = chan->sk; 14130a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_RAW) 14140a708f8fSGustavo F. Padovan continue; 14150a708f8fSGustavo F. Padovan 14160a708f8fSGustavo F. Padovan /* Don't send frame to the socket it came from */ 14170a708f8fSGustavo F. Padovan if (skb->sk == sk) 14180a708f8fSGustavo F. Padovan continue; 14190a708f8fSGustavo F. Padovan nskb = skb_clone(skb, GFP_ATOMIC); 14200a708f8fSGustavo F. Padovan if (!nskb) 14210a708f8fSGustavo F. Padovan continue; 14220a708f8fSGustavo F. Padovan 14230a708f8fSGustavo F. Padovan if (sock_queue_rcv_skb(sk, nskb)) 14240a708f8fSGustavo F. Padovan kfree_skb(nskb); 14250a708f8fSGustavo F. Padovan } 1426baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 14270a708f8fSGustavo F. Padovan } 14280a708f8fSGustavo F. Padovan 14290a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 14300a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 14310a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data) 14320a708f8fSGustavo F. Padovan { 14330a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 14340a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 14350a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 14360a708f8fSGustavo F. Padovan int len, count; 14370a708f8fSGustavo F. Padovan 14380a708f8fSGustavo F. Padovan BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", 14390a708f8fSGustavo F. Padovan conn, code, ident, dlen); 14400a708f8fSGustavo F. Padovan 14410a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 14420a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 14430a708f8fSGustavo F. Padovan 14440a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 14450a708f8fSGustavo F. Padovan if (!skb) 14460a708f8fSGustavo F. Padovan return NULL; 14470a708f8fSGustavo F. Padovan 14480a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 14490a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 14503300d9a9SClaudio Takahasi 14513300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 14523300d9a9SClaudio Takahasi lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); 14533300d9a9SClaudio Takahasi else 14540a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); 14550a708f8fSGustavo F. Padovan 14560a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 14570a708f8fSGustavo F. Padovan cmd->code = code; 14580a708f8fSGustavo F. Padovan cmd->ident = ident; 14590a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 14600a708f8fSGustavo F. Padovan 14610a708f8fSGustavo F. Padovan if (dlen) { 14620a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 14630a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 14640a708f8fSGustavo F. Padovan data += count; 14650a708f8fSGustavo F. Padovan } 14660a708f8fSGustavo F. Padovan 14670a708f8fSGustavo F. Padovan len -= skb->len; 14680a708f8fSGustavo F. Padovan 14690a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 14700a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 14710a708f8fSGustavo F. Padovan while (len) { 14720a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 14730a708f8fSGustavo F. Padovan 14740a708f8fSGustavo F. Padovan *frag = bt_skb_alloc(count, GFP_ATOMIC); 14750a708f8fSGustavo F. Padovan if (!*frag) 14760a708f8fSGustavo F. Padovan goto fail; 14770a708f8fSGustavo F. Padovan 14780a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 14790a708f8fSGustavo F. Padovan 14800a708f8fSGustavo F. Padovan len -= count; 14810a708f8fSGustavo F. Padovan data += count; 14820a708f8fSGustavo F. Padovan 14830a708f8fSGustavo F. Padovan frag = &(*frag)->next; 14840a708f8fSGustavo F. Padovan } 14850a708f8fSGustavo F. Padovan 14860a708f8fSGustavo F. Padovan return skb; 14870a708f8fSGustavo F. Padovan 14880a708f8fSGustavo F. Padovan fail: 14890a708f8fSGustavo F. Padovan kfree_skb(skb); 14900a708f8fSGustavo F. Padovan return NULL; 14910a708f8fSGustavo F. Padovan } 14920a708f8fSGustavo F. Padovan 14930a708f8fSGustavo F. Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) 14940a708f8fSGustavo F. Padovan { 14950a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 14960a708f8fSGustavo F. Padovan int len; 14970a708f8fSGustavo F. Padovan 14980a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 14990a708f8fSGustavo F. Padovan *ptr += len; 15000a708f8fSGustavo F. Padovan 15010a708f8fSGustavo F. Padovan *type = opt->type; 15020a708f8fSGustavo F. Padovan *olen = opt->len; 15030a708f8fSGustavo F. Padovan 15040a708f8fSGustavo F. Padovan switch (opt->len) { 15050a708f8fSGustavo F. Padovan case 1: 15060a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 15070a708f8fSGustavo F. Padovan break; 15080a708f8fSGustavo F. Padovan 15090a708f8fSGustavo F. Padovan case 2: 15100a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 15110a708f8fSGustavo F. Padovan break; 15120a708f8fSGustavo F. Padovan 15130a708f8fSGustavo F. Padovan case 4: 15140a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 15150a708f8fSGustavo F. Padovan break; 15160a708f8fSGustavo F. Padovan 15170a708f8fSGustavo F. Padovan default: 15180a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 15190a708f8fSGustavo F. Padovan break; 15200a708f8fSGustavo F. Padovan } 15210a708f8fSGustavo F. Padovan 15220a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); 15230a708f8fSGustavo F. Padovan return len; 15240a708f8fSGustavo F. Padovan } 15250a708f8fSGustavo F. Padovan 15260a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 15270a708f8fSGustavo F. Padovan { 15280a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 15290a708f8fSGustavo F. Padovan 15300a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); 15310a708f8fSGustavo F. Padovan 15320a708f8fSGustavo F. Padovan opt->type = type; 15330a708f8fSGustavo F. Padovan opt->len = len; 15340a708f8fSGustavo F. Padovan 15350a708f8fSGustavo F. Padovan switch (len) { 15360a708f8fSGustavo F. Padovan case 1: 15370a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 15380a708f8fSGustavo F. Padovan break; 15390a708f8fSGustavo F. Padovan 15400a708f8fSGustavo F. Padovan case 2: 15410a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 15420a708f8fSGustavo F. Padovan break; 15430a708f8fSGustavo F. Padovan 15440a708f8fSGustavo F. Padovan case 4: 15450a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 15460a708f8fSGustavo F. Padovan break; 15470a708f8fSGustavo F. Padovan 15480a708f8fSGustavo F. Padovan default: 15490a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 15500a708f8fSGustavo F. Padovan break; 15510a708f8fSGustavo F. Padovan } 15520a708f8fSGustavo F. Padovan 15530a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 15540a708f8fSGustavo F. Padovan } 15550a708f8fSGustavo F. Padovan 15560a708f8fSGustavo F. Padovan static void l2cap_ack_timeout(unsigned long arg) 15570a708f8fSGustavo F. Padovan { 15580a708f8fSGustavo F. Padovan struct sock *sk = (void *) arg; 15590a708f8fSGustavo F. Padovan 15600a708f8fSGustavo F. Padovan bh_lock_sock(sk); 15610a708f8fSGustavo F. Padovan l2cap_send_ack(l2cap_pi(sk)); 15620a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 15630a708f8fSGustavo F. Padovan } 15640a708f8fSGustavo F. Padovan 15650a708f8fSGustavo F. Padovan static inline void l2cap_ertm_init(struct sock *sk) 15660a708f8fSGustavo F. Padovan { 15670a708f8fSGustavo F. Padovan l2cap_pi(sk)->expected_ack_seq = 0; 15680a708f8fSGustavo F. Padovan l2cap_pi(sk)->unacked_frames = 0; 15690a708f8fSGustavo F. Padovan l2cap_pi(sk)->buffer_seq = 0; 15700a708f8fSGustavo F. Padovan l2cap_pi(sk)->num_acked = 0; 15710a708f8fSGustavo F. Padovan l2cap_pi(sk)->frames_sent = 0; 15720a708f8fSGustavo F. Padovan 15730a708f8fSGustavo F. Padovan setup_timer(&l2cap_pi(sk)->retrans_timer, 15740a708f8fSGustavo F. Padovan l2cap_retrans_timeout, (unsigned long) sk); 15750a708f8fSGustavo F. Padovan setup_timer(&l2cap_pi(sk)->monitor_timer, 15760a708f8fSGustavo F. Padovan l2cap_monitor_timeout, (unsigned long) sk); 15770a708f8fSGustavo F. Padovan setup_timer(&l2cap_pi(sk)->ack_timer, 15780a708f8fSGustavo F. Padovan l2cap_ack_timeout, (unsigned long) sk); 15790a708f8fSGustavo F. Padovan 15800a708f8fSGustavo F. Padovan __skb_queue_head_init(SREJ_QUEUE(sk)); 15810a708f8fSGustavo F. Padovan __skb_queue_head_init(BUSY_QUEUE(sk)); 15820a708f8fSGustavo F. Padovan 15830a708f8fSGustavo F. Padovan INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); 15840a708f8fSGustavo F. Padovan 15850a708f8fSGustavo F. Padovan sk->sk_backlog_rcv = l2cap_ertm_data_rcv; 15860a708f8fSGustavo F. Padovan } 15870a708f8fSGustavo F. Padovan 15880a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 15890a708f8fSGustavo F. Padovan { 15900a708f8fSGustavo F. Padovan switch (mode) { 15910a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 15920a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 15930a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 15940a708f8fSGustavo F. Padovan return mode; 15950a708f8fSGustavo F. Padovan /* fall through */ 15960a708f8fSGustavo F. Padovan default: 15970a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 15980a708f8fSGustavo F. Padovan } 15990a708f8fSGustavo F. Padovan } 16000a708f8fSGustavo F. Padovan 160168983259SGustavo F. Padovan int l2cap_build_conf_req(struct sock *sk, void *data) 16020a708f8fSGustavo F. Padovan { 16030a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 16040a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 16050a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = pi->mode }; 16060a708f8fSGustavo F. Padovan void *ptr = req->data; 16070a708f8fSGustavo F. Padovan 16080a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 16090a708f8fSGustavo F. Padovan 16100a708f8fSGustavo F. Padovan if (pi->num_conf_req || pi->num_conf_rsp) 16110a708f8fSGustavo F. Padovan goto done; 16120a708f8fSGustavo F. Padovan 16130a708f8fSGustavo F. Padovan switch (pi->mode) { 16140a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 16150a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 16160a708f8fSGustavo F. Padovan if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) 16170a708f8fSGustavo F. Padovan break; 16180a708f8fSGustavo F. Padovan 16190a708f8fSGustavo F. Padovan /* fall through */ 16200a708f8fSGustavo F. Padovan default: 16210a708f8fSGustavo F. Padovan pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); 16220a708f8fSGustavo F. Padovan break; 16230a708f8fSGustavo F. Padovan } 16240a708f8fSGustavo F. Padovan 16250a708f8fSGustavo F. Padovan done: 16260a708f8fSGustavo F. Padovan if (pi->imtu != L2CAP_DEFAULT_MTU) 16270a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); 16280a708f8fSGustavo F. Padovan 16290a708f8fSGustavo F. Padovan switch (pi->mode) { 16300a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 16310a708f8fSGustavo F. Padovan if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && 16320a708f8fSGustavo F. Padovan !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) 16330a708f8fSGustavo F. Padovan break; 16340a708f8fSGustavo F. Padovan 16350a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 16360a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 16370a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 16380a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 16390a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 16400a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 16410a708f8fSGustavo F. Padovan 16420a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 16430a708f8fSGustavo F. Padovan (unsigned long) &rfc); 16440a708f8fSGustavo F. Padovan break; 16450a708f8fSGustavo F. Padovan 16460a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 16470a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 16480a708f8fSGustavo F. Padovan rfc.txwin_size = pi->tx_win; 16490a708f8fSGustavo F. Padovan rfc.max_transmit = pi->max_tx; 16500a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 16510a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 16520a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 16530a708f8fSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) 16540a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 16550a708f8fSGustavo F. Padovan 16560a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 16570a708f8fSGustavo F. Padovan (unsigned long) &rfc); 16580a708f8fSGustavo F. Padovan 16590a708f8fSGustavo F. Padovan if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) 16600a708f8fSGustavo F. Padovan break; 16610a708f8fSGustavo F. Padovan 16620a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_NONE || 16630a708f8fSGustavo F. Padovan pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { 16640a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 16650a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); 16660a708f8fSGustavo F. Padovan } 16670a708f8fSGustavo F. Padovan break; 16680a708f8fSGustavo F. Padovan 16690a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 16700a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 16710a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 16720a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 16730a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 16740a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 16750a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 16760a708f8fSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) 16770a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 16780a708f8fSGustavo F. Padovan 16790a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 16800a708f8fSGustavo F. Padovan (unsigned long) &rfc); 16810a708f8fSGustavo F. Padovan 16820a708f8fSGustavo F. Padovan if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) 16830a708f8fSGustavo F. Padovan break; 16840a708f8fSGustavo F. Padovan 16850a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_NONE || 16860a708f8fSGustavo F. Padovan pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { 16870a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 16880a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); 16890a708f8fSGustavo F. Padovan } 16900a708f8fSGustavo F. Padovan break; 16910a708f8fSGustavo F. Padovan } 16920a708f8fSGustavo F. Padovan 16930a708f8fSGustavo F. Padovan req->dcid = cpu_to_le16(pi->dcid); 16940a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0); 16950a708f8fSGustavo F. Padovan 16960a708f8fSGustavo F. Padovan return ptr - data; 16970a708f8fSGustavo F. Padovan } 16980a708f8fSGustavo F. Padovan 16990a708f8fSGustavo F. Padovan static int l2cap_parse_conf_req(struct sock *sk, void *data) 17000a708f8fSGustavo F. Padovan { 17010a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 17020a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 17030a708f8fSGustavo F. Padovan void *ptr = rsp->data; 17040a708f8fSGustavo F. Padovan void *req = pi->conf_req; 17050a708f8fSGustavo F. Padovan int len = pi->conf_len; 17060a708f8fSGustavo F. Padovan int type, hint, olen; 17070a708f8fSGustavo F. Padovan unsigned long val; 17080a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 17090a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 17100a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 17110a708f8fSGustavo F. Padovan 17120a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 17130a708f8fSGustavo F. Padovan 17140a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 17150a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 17160a708f8fSGustavo F. Padovan 17170a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 17180a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 17190a708f8fSGustavo F. Padovan 17200a708f8fSGustavo F. Padovan switch (type) { 17210a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 17220a708f8fSGustavo F. Padovan mtu = val; 17230a708f8fSGustavo F. Padovan break; 17240a708f8fSGustavo F. Padovan 17250a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 17260a708f8fSGustavo F. Padovan pi->flush_to = val; 17270a708f8fSGustavo F. Padovan break; 17280a708f8fSGustavo F. Padovan 17290a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 17300a708f8fSGustavo F. Padovan break; 17310a708f8fSGustavo F. Padovan 17320a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 17330a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 17340a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 17350a708f8fSGustavo F. Padovan break; 17360a708f8fSGustavo F. Padovan 17370a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 17380a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 17390a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; 17400a708f8fSGustavo F. Padovan 17410a708f8fSGustavo F. Padovan break; 17420a708f8fSGustavo F. Padovan 17430a708f8fSGustavo F. Padovan default: 17440a708f8fSGustavo F. Padovan if (hint) 17450a708f8fSGustavo F. Padovan break; 17460a708f8fSGustavo F. Padovan 17470a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 17480a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 17490a708f8fSGustavo F. Padovan break; 17500a708f8fSGustavo F. Padovan } 17510a708f8fSGustavo F. Padovan } 17520a708f8fSGustavo F. Padovan 17530a708f8fSGustavo F. Padovan if (pi->num_conf_rsp || pi->num_conf_req > 1) 17540a708f8fSGustavo F. Padovan goto done; 17550a708f8fSGustavo F. Padovan 17560a708f8fSGustavo F. Padovan switch (pi->mode) { 17570a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 17580a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 17590a708f8fSGustavo F. Padovan if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { 17600a708f8fSGustavo F. Padovan pi->mode = l2cap_select_mode(rfc.mode, 17610a708f8fSGustavo F. Padovan pi->conn->feat_mask); 17620a708f8fSGustavo F. Padovan break; 17630a708f8fSGustavo F. Padovan } 17640a708f8fSGustavo F. Padovan 17650a708f8fSGustavo F. Padovan if (pi->mode != rfc.mode) 17660a708f8fSGustavo F. Padovan return -ECONNREFUSED; 17670a708f8fSGustavo F. Padovan 17680a708f8fSGustavo F. Padovan break; 17690a708f8fSGustavo F. Padovan } 17700a708f8fSGustavo F. Padovan 17710a708f8fSGustavo F. Padovan done: 17720a708f8fSGustavo F. Padovan if (pi->mode != rfc.mode) { 17730a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 17740a708f8fSGustavo F. Padovan rfc.mode = pi->mode; 17750a708f8fSGustavo F. Padovan 17760a708f8fSGustavo F. Padovan if (pi->num_conf_rsp == 1) 17770a708f8fSGustavo F. Padovan return -ECONNREFUSED; 17780a708f8fSGustavo F. Padovan 17790a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 17800a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 17810a708f8fSGustavo F. Padovan } 17820a708f8fSGustavo F. Padovan 17830a708f8fSGustavo F. Padovan 17840a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 17850a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 17860a708f8fSGustavo F. Padovan * which ones we don't like. */ 17870a708f8fSGustavo F. Padovan 17880a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 17890a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 17900a708f8fSGustavo F. Padovan else { 17910a708f8fSGustavo F. Padovan pi->omtu = mtu; 17920a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MTU_DONE; 17930a708f8fSGustavo F. Padovan } 17940a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); 17950a708f8fSGustavo F. Padovan 17960a708f8fSGustavo F. Padovan switch (rfc.mode) { 17970a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 17980a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 17990a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MODE_DONE; 18000a708f8fSGustavo F. Padovan break; 18010a708f8fSGustavo F. Padovan 18020a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 18030a708f8fSGustavo F. Padovan pi->remote_tx_win = rfc.txwin_size; 18040a708f8fSGustavo F. Padovan pi->remote_max_tx = rfc.max_transmit; 18050a708f8fSGustavo F. Padovan 18060a708f8fSGustavo F. Padovan if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) 18070a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 18080a708f8fSGustavo F. Padovan 18090a708f8fSGustavo F. Padovan pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); 18100a708f8fSGustavo F. Padovan 18110a708f8fSGustavo F. Padovan rfc.retrans_timeout = 18120a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); 18130a708f8fSGustavo F. Padovan rfc.monitor_timeout = 18140a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); 18150a708f8fSGustavo F. Padovan 18160a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MODE_DONE; 18170a708f8fSGustavo F. Padovan 18180a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 18190a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 18200a708f8fSGustavo F. Padovan 18210a708f8fSGustavo F. Padovan break; 18220a708f8fSGustavo F. Padovan 18230a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 18240a708f8fSGustavo F. Padovan if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) 18250a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 18260a708f8fSGustavo F. Padovan 18270a708f8fSGustavo F. Padovan pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); 18280a708f8fSGustavo F. Padovan 18290a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MODE_DONE; 18300a708f8fSGustavo F. Padovan 18310a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 18320a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 18330a708f8fSGustavo F. Padovan 18340a708f8fSGustavo F. Padovan break; 18350a708f8fSGustavo F. Padovan 18360a708f8fSGustavo F. Padovan default: 18370a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 18380a708f8fSGustavo F. Padovan 18390a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 18400a708f8fSGustavo F. Padovan rfc.mode = pi->mode; 18410a708f8fSGustavo F. Padovan } 18420a708f8fSGustavo F. Padovan 18430a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 18440a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; 18450a708f8fSGustavo F. Padovan } 18460a708f8fSGustavo F. Padovan rsp->scid = cpu_to_le16(pi->dcid); 18470a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 18480a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(0x0000); 18490a708f8fSGustavo F. Padovan 18500a708f8fSGustavo F. Padovan return ptr - data; 18510a708f8fSGustavo F. Padovan } 18520a708f8fSGustavo F. Padovan 18530a708f8fSGustavo F. Padovan static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) 18540a708f8fSGustavo F. Padovan { 18550a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 18560a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 18570a708f8fSGustavo F. Padovan void *ptr = req->data; 18580a708f8fSGustavo F. Padovan int type, olen; 18590a708f8fSGustavo F. Padovan unsigned long val; 18600a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 18610a708f8fSGustavo F. Padovan 18620a708f8fSGustavo F. Padovan BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); 18630a708f8fSGustavo F. Padovan 18640a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 18650a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 18660a708f8fSGustavo F. Padovan 18670a708f8fSGustavo F. Padovan switch (type) { 18680a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 18690a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 18700a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 18710a708f8fSGustavo F. Padovan pi->imtu = L2CAP_DEFAULT_MIN_MTU; 18720a708f8fSGustavo F. Padovan } else 18730a708f8fSGustavo F. Padovan pi->imtu = val; 18740a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); 18750a708f8fSGustavo F. Padovan break; 18760a708f8fSGustavo F. Padovan 18770a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 18780a708f8fSGustavo F. Padovan pi->flush_to = val; 18790a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 18800a708f8fSGustavo F. Padovan 2, pi->flush_to); 18810a708f8fSGustavo F. Padovan break; 18820a708f8fSGustavo F. Padovan 18830a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 18840a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 18850a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 18860a708f8fSGustavo F. Padovan 18870a708f8fSGustavo F. Padovan if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && 18880a708f8fSGustavo F. Padovan rfc.mode != pi->mode) 18890a708f8fSGustavo F. Padovan return -ECONNREFUSED; 18900a708f8fSGustavo F. Padovan 18910a708f8fSGustavo F. Padovan pi->fcs = 0; 18920a708f8fSGustavo F. Padovan 18930a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 18940a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 18950a708f8fSGustavo F. Padovan break; 18960a708f8fSGustavo F. Padovan } 18970a708f8fSGustavo F. Padovan } 18980a708f8fSGustavo F. Padovan 18990a708f8fSGustavo F. Padovan if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) 19000a708f8fSGustavo F. Padovan return -ECONNREFUSED; 19010a708f8fSGustavo F. Padovan 19020a708f8fSGustavo F. Padovan pi->mode = rfc.mode; 19030a708f8fSGustavo F. Padovan 19040a708f8fSGustavo F. Padovan if (*result == L2CAP_CONF_SUCCESS) { 19050a708f8fSGustavo F. Padovan switch (rfc.mode) { 19060a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 19070a708f8fSGustavo F. Padovan pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 19080a708f8fSGustavo F. Padovan pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 19090a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19100a708f8fSGustavo F. Padovan break; 19110a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 19120a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19130a708f8fSGustavo F. Padovan } 19140a708f8fSGustavo F. Padovan } 19150a708f8fSGustavo F. Padovan 19160a708f8fSGustavo F. Padovan req->dcid = cpu_to_le16(pi->dcid); 19170a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0x0000); 19180a708f8fSGustavo F. Padovan 19190a708f8fSGustavo F. Padovan return ptr - data; 19200a708f8fSGustavo F. Padovan } 19210a708f8fSGustavo F. Padovan 19220a708f8fSGustavo F. Padovan static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) 19230a708f8fSGustavo F. Padovan { 19240a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 19250a708f8fSGustavo F. Padovan void *ptr = rsp->data; 19260a708f8fSGustavo F. Padovan 19270a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 19280a708f8fSGustavo F. Padovan 19290a708f8fSGustavo F. Padovan rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); 19300a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 19310a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 19320a708f8fSGustavo F. Padovan 19330a708f8fSGustavo F. Padovan return ptr - data; 19340a708f8fSGustavo F. Padovan } 19350a708f8fSGustavo F. Padovan 19360a708f8fSGustavo F. Padovan static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) 19370a708f8fSGustavo F. Padovan { 19380a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 19390a708f8fSGustavo F. Padovan int type, olen; 19400a708f8fSGustavo F. Padovan unsigned long val; 19410a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 19420a708f8fSGustavo F. Padovan 19430a708f8fSGustavo F. Padovan BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); 19440a708f8fSGustavo F. Padovan 19450a708f8fSGustavo F. Padovan if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) 19460a708f8fSGustavo F. Padovan return; 19470a708f8fSGustavo F. Padovan 19480a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 19490a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 19500a708f8fSGustavo F. Padovan 19510a708f8fSGustavo F. Padovan switch (type) { 19520a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 19530a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 19540a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 19550a708f8fSGustavo F. Padovan goto done; 19560a708f8fSGustavo F. Padovan } 19570a708f8fSGustavo F. Padovan } 19580a708f8fSGustavo F. Padovan 19590a708f8fSGustavo F. Padovan done: 19600a708f8fSGustavo F. Padovan switch (rfc.mode) { 19610a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 19620a708f8fSGustavo F. Padovan pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 19630a708f8fSGustavo F. Padovan pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 19640a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19650a708f8fSGustavo F. Padovan break; 19660a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 19670a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19680a708f8fSGustavo F. Padovan } 19690a708f8fSGustavo F. Padovan } 19700a708f8fSGustavo F. Padovan 19710a708f8fSGustavo F. Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 19720a708f8fSGustavo F. Padovan { 19730a708f8fSGustavo F. Padovan struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; 19740a708f8fSGustavo F. Padovan 19750a708f8fSGustavo F. Padovan if (rej->reason != 0x0000) 19760a708f8fSGustavo F. Padovan return 0; 19770a708f8fSGustavo F. Padovan 19780a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 19790a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 19800a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 19810a708f8fSGustavo F. Padovan 19820a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 19830a708f8fSGustavo F. Padovan conn->info_ident = 0; 19840a708f8fSGustavo F. Padovan 19850a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 19860a708f8fSGustavo F. Padovan } 19870a708f8fSGustavo F. Padovan 19880a708f8fSGustavo F. Padovan return 0; 19890a708f8fSGustavo F. Padovan } 19900a708f8fSGustavo F. Padovan 19910a708f8fSGustavo F. Padovan static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 19920a708f8fSGustavo F. Padovan { 19930a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 19940a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 199548454079SGustavo F. Padovan struct l2cap_chan *chan; 19960a708f8fSGustavo F. Padovan struct sock *parent, *sk = NULL; 19970a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 19980a708f8fSGustavo F. Padovan 19990a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 20000a708f8fSGustavo F. Padovan __le16 psm = req->psm; 20010a708f8fSGustavo F. Padovan 20020a708f8fSGustavo F. Padovan BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); 20030a708f8fSGustavo F. Padovan 20040a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 20050a708f8fSGustavo F. Padovan parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); 20060a708f8fSGustavo F. Padovan if (!parent) { 20070a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 20080a708f8fSGustavo F. Padovan goto sendresp; 20090a708f8fSGustavo F. Padovan } 20100a708f8fSGustavo F. Padovan 20110a708f8fSGustavo F. Padovan bh_lock_sock(parent); 20120a708f8fSGustavo F. Padovan 20130a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 20140a708f8fSGustavo F. Padovan if (psm != cpu_to_le16(0x0001) && 20150a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 20160a708f8fSGustavo F. Padovan conn->disc_reason = 0x05; 20170a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 20180a708f8fSGustavo F. Padovan goto response; 20190a708f8fSGustavo F. Padovan } 20200a708f8fSGustavo F. Padovan 20210a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 20220a708f8fSGustavo F. Padovan 20230a708f8fSGustavo F. Padovan /* Check for backlog size */ 20240a708f8fSGustavo F. Padovan if (sk_acceptq_is_full(parent)) { 20250a708f8fSGustavo F. Padovan BT_DBG("backlog full %d", parent->sk_ack_backlog); 20260a708f8fSGustavo F. Padovan goto response; 20270a708f8fSGustavo F. Padovan } 20280a708f8fSGustavo F. Padovan 20290a708f8fSGustavo F. Padovan sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); 20300a708f8fSGustavo F. Padovan if (!sk) 20310a708f8fSGustavo F. Padovan goto response; 20320a708f8fSGustavo F. Padovan 203348454079SGustavo F. Padovan chan = l2cap_chan_alloc(sk); 203448454079SGustavo F. Padovan if (!chan) { 203548454079SGustavo F. Padovan l2cap_sock_kill(sk); 203648454079SGustavo F. Padovan goto response; 203748454079SGustavo F. Padovan } 203848454079SGustavo F. Padovan 2039baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 20400a708f8fSGustavo F. Padovan 20410a708f8fSGustavo F. Padovan /* Check if we already have channel with that dcid */ 2042baa7e1faSGustavo F. Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) { 2043baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 20440a708f8fSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 20450a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 20460a708f8fSGustavo F. Padovan goto response; 20470a708f8fSGustavo F. Padovan } 20480a708f8fSGustavo F. Padovan 20490a708f8fSGustavo F. Padovan hci_conn_hold(conn->hcon); 20500a708f8fSGustavo F. Padovan 20510a708f8fSGustavo F. Padovan l2cap_sock_init(sk, parent); 20520a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->src, conn->src); 20530a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->dst, conn->dst); 20540a708f8fSGustavo F. Padovan l2cap_pi(sk)->psm = psm; 20550a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = scid; 20560a708f8fSGustavo F. Padovan 2057d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 2058d1010240SGustavo F. Padovan 205948454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 206048454079SGustavo F. Padovan 206148454079SGustavo F. Padovan l2cap_pi(sk)->chan = chan; 206248454079SGustavo F. Padovan 20630a708f8fSGustavo F. Padovan dcid = l2cap_pi(sk)->scid; 20640a708f8fSGustavo F. Padovan 20650a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, sk->sk_sndtimeo); 20660a708f8fSGustavo F. Padovan 2067fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 20680a708f8fSGustavo F. Padovan 20690a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 20700a708f8fSGustavo F. Padovan if (l2cap_check_security(sk)) { 20710a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 20720a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 20730a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 20740a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 20750a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 20760a708f8fSGustavo F. Padovan } else { 20770a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 20780a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 20790a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 20800a708f8fSGustavo F. Padovan } 20810a708f8fSGustavo F. Padovan } else { 20820a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 20830a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 20840a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 20850a708f8fSGustavo F. Padovan } 20860a708f8fSGustavo F. Padovan } else { 20870a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 20880a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 20890a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 20900a708f8fSGustavo F. Padovan } 20910a708f8fSGustavo F. Padovan 2092baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 20930a708f8fSGustavo F. Padovan 20940a708f8fSGustavo F. Padovan response: 20950a708f8fSGustavo F. Padovan bh_unlock_sock(parent); 20960a708f8fSGustavo F. Padovan 20970a708f8fSGustavo F. Padovan sendresp: 20980a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 20990a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 21000a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 21010a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 21020a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); 21030a708f8fSGustavo F. Padovan 21040a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 21050a708f8fSGustavo F. Padovan struct l2cap_info_req info; 21060a708f8fSGustavo F. Padovan info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 21070a708f8fSGustavo F. Padovan 21080a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 21090a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 21100a708f8fSGustavo F. Padovan 21110a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 21120a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 21130a708f8fSGustavo F. Padovan 21140a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 21150a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(info), &info); 21160a708f8fSGustavo F. Padovan } 21170a708f8fSGustavo F. Padovan 21180a708f8fSGustavo F. Padovan if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && 21190a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 21200a708f8fSGustavo F. Padovan u8 buf[128]; 21210a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 21220a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 21230a708f8fSGustavo F. Padovan l2cap_build_conf_req(sk, buf), buf); 21240a708f8fSGustavo F. Padovan l2cap_pi(sk)->num_conf_req++; 21250a708f8fSGustavo F. Padovan } 21260a708f8fSGustavo F. Padovan 21270a708f8fSGustavo F. Padovan return 0; 21280a708f8fSGustavo F. Padovan } 21290a708f8fSGustavo F. Padovan 21300a708f8fSGustavo F. Padovan static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 21310a708f8fSGustavo F. Padovan { 21320a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 21330a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 213448454079SGustavo F. Padovan struct l2cap_chan *chan; 21350a708f8fSGustavo F. Padovan struct sock *sk; 21360a708f8fSGustavo F. Padovan u8 req[128]; 21370a708f8fSGustavo F. Padovan 21380a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 21390a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 21400a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 21410a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 21420a708f8fSGustavo F. Padovan 21430a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); 21440a708f8fSGustavo F. Padovan 21450a708f8fSGustavo F. Padovan if (scid) { 2146baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 214748454079SGustavo F. Padovan if (!chan) 21480a708f8fSGustavo F. Padovan return -EFAULT; 21490a708f8fSGustavo F. Padovan } else { 2150baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_ident(conn, cmd->ident); 215148454079SGustavo F. Padovan if (!chan) 21520a708f8fSGustavo F. Padovan return -EFAULT; 21530a708f8fSGustavo F. Padovan } 21540a708f8fSGustavo F. Padovan 215548454079SGustavo F. Padovan sk = chan->sk; 215648454079SGustavo F. Padovan 21570a708f8fSGustavo F. Padovan switch (result) { 21580a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 21590a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 2160fc7f8a7eSGustavo F. Padovan chan->ident = 0; 21610a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = dcid; 21620a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; 21630a708f8fSGustavo F. Padovan 21640a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) 21650a708f8fSGustavo F. Padovan break; 21660a708f8fSGustavo F. Padovan 21670a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 21680a708f8fSGustavo F. Padovan 21690a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 21700a708f8fSGustavo F. Padovan l2cap_build_conf_req(sk, req), req); 21710a708f8fSGustavo F. Padovan l2cap_pi(sk)->num_conf_req++; 21720a708f8fSGustavo F. Padovan break; 21730a708f8fSGustavo F. Padovan 21740a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 21750a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 21760a708f8fSGustavo F. Padovan break; 21770a708f8fSGustavo F. Padovan 21780a708f8fSGustavo F. Padovan default: 21790a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 21800a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 21810a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 21820a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 21830a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 5); 21840a708f8fSGustavo F. Padovan break; 21850a708f8fSGustavo F. Padovan } 21860a708f8fSGustavo F. Padovan 218748454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 21880a708f8fSGustavo F. Padovan break; 21890a708f8fSGustavo F. Padovan } 21900a708f8fSGustavo F. Padovan 21910a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 21920a708f8fSGustavo F. Padovan return 0; 21930a708f8fSGustavo F. Padovan } 21940a708f8fSGustavo F. Padovan 21950a708f8fSGustavo F. Padovan static inline void set_default_fcs(struct l2cap_pinfo *pi) 21960a708f8fSGustavo F. Padovan { 21970a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 21980a708f8fSGustavo F. Padovan * sides request it. 21990a708f8fSGustavo F. Padovan */ 22000a708f8fSGustavo F. Padovan if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) 22010a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 22020a708f8fSGustavo F. Padovan else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) 22030a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_CRC16; 22040a708f8fSGustavo F. Padovan } 22050a708f8fSGustavo F. Padovan 22060a708f8fSGustavo F. Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 22070a708f8fSGustavo F. Padovan { 22080a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 22090a708f8fSGustavo F. Padovan u16 dcid, flags; 22100a708f8fSGustavo F. Padovan u8 rsp[64]; 221148454079SGustavo F. Padovan struct l2cap_chan *chan; 22120a708f8fSGustavo F. Padovan struct sock *sk; 22130a708f8fSGustavo F. Padovan int len; 22140a708f8fSGustavo F. Padovan 22150a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 22160a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 22170a708f8fSGustavo F. Padovan 22180a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 22190a708f8fSGustavo F. Padovan 2220baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 222148454079SGustavo F. Padovan if (!chan) 22220a708f8fSGustavo F. Padovan return -ENOENT; 22230a708f8fSGustavo F. Padovan 222448454079SGustavo F. Padovan sk = chan->sk; 222548454079SGustavo F. Padovan 22260a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONFIG) { 22270a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 22280a708f8fSGustavo F. Padovan 22290a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0x0002); 22300a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 22310a708f8fSGustavo F. Padovan sizeof(rej), &rej); 22320a708f8fSGustavo F. Padovan goto unlock; 22330a708f8fSGustavo F. Padovan } 22340a708f8fSGustavo F. Padovan 22350a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 22360a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 22370a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { 22380a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 22390a708f8fSGustavo F. Padovan l2cap_build_conf_rsp(sk, rsp, 22400a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 22410a708f8fSGustavo F. Padovan goto unlock; 22420a708f8fSGustavo F. Padovan } 22430a708f8fSGustavo F. Padovan 22440a708f8fSGustavo F. Padovan /* Store config. */ 22450a708f8fSGustavo F. Padovan memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); 22460a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_len += len; 22470a708f8fSGustavo F. Padovan 22480a708f8fSGustavo F. Padovan if (flags & 0x0001) { 22490a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 22500a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 22510a708f8fSGustavo F. Padovan l2cap_build_conf_rsp(sk, rsp, 22520a708f8fSGustavo F. Padovan L2CAP_CONF_SUCCESS, 0x0001), rsp); 22530a708f8fSGustavo F. Padovan goto unlock; 22540a708f8fSGustavo F. Padovan } 22550a708f8fSGustavo F. Padovan 22560a708f8fSGustavo F. Padovan /* Complete config. */ 22570a708f8fSGustavo F. Padovan len = l2cap_parse_conf_req(sk, rsp); 22580a708f8fSGustavo F. Padovan if (len < 0) { 22590a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 22600a708f8fSGustavo F. Padovan goto unlock; 22610a708f8fSGustavo F. Padovan } 22620a708f8fSGustavo F. Padovan 22630a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 22640a708f8fSGustavo F. Padovan l2cap_pi(sk)->num_conf_rsp++; 22650a708f8fSGustavo F. Padovan 22660a708f8fSGustavo F. Padovan /* Reset config buffer. */ 22670a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_len = 0; 22680a708f8fSGustavo F. Padovan 22690a708f8fSGustavo F. Padovan if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) 22700a708f8fSGustavo F. Padovan goto unlock; 22710a708f8fSGustavo F. Padovan 22720a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { 22730a708f8fSGustavo F. Padovan set_default_fcs(l2cap_pi(sk)); 22740a708f8fSGustavo F. Padovan 22750a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 22760a708f8fSGustavo F. Padovan 22770a708f8fSGustavo F. Padovan l2cap_pi(sk)->next_tx_seq = 0; 22780a708f8fSGustavo F. Padovan l2cap_pi(sk)->expected_tx_seq = 0; 22790a708f8fSGustavo F. Padovan __skb_queue_head_init(TX_QUEUE(sk)); 22800a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) 22810a708f8fSGustavo F. Padovan l2cap_ertm_init(sk); 22820a708f8fSGustavo F. Padovan 22830a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 22840a708f8fSGustavo F. Padovan goto unlock; 22850a708f8fSGustavo F. Padovan } 22860a708f8fSGustavo F. Padovan 22870a708f8fSGustavo F. Padovan if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { 22880a708f8fSGustavo F. Padovan u8 buf[64]; 22890a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 22900a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 22910a708f8fSGustavo F. Padovan l2cap_build_conf_req(sk, buf), buf); 22920a708f8fSGustavo F. Padovan l2cap_pi(sk)->num_conf_req++; 22930a708f8fSGustavo F. Padovan } 22940a708f8fSGustavo F. Padovan 22950a708f8fSGustavo F. Padovan unlock: 22960a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 22970a708f8fSGustavo F. Padovan return 0; 22980a708f8fSGustavo F. Padovan } 22990a708f8fSGustavo F. Padovan 23000a708f8fSGustavo F. Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 23010a708f8fSGustavo F. Padovan { 23020a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 23030a708f8fSGustavo F. Padovan u16 scid, flags, result; 230448454079SGustavo F. Padovan struct l2cap_chan *chan; 23050a708f8fSGustavo F. Padovan struct sock *sk; 23060a708f8fSGustavo F. Padovan int len = cmd->len - sizeof(*rsp); 23070a708f8fSGustavo F. Padovan 23080a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 23090a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 23100a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 23110a708f8fSGustavo F. Padovan 23120a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", 23130a708f8fSGustavo F. Padovan scid, flags, result); 23140a708f8fSGustavo F. Padovan 2315baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 231648454079SGustavo F. Padovan if (!chan) 23170a708f8fSGustavo F. Padovan return 0; 23180a708f8fSGustavo F. Padovan 231948454079SGustavo F. Padovan sk = chan->sk; 232048454079SGustavo F. Padovan 23210a708f8fSGustavo F. Padovan switch (result) { 23220a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 23230a708f8fSGustavo F. Padovan l2cap_conf_rfc_get(sk, rsp->data, len); 23240a708f8fSGustavo F. Padovan break; 23250a708f8fSGustavo F. Padovan 23260a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 23270a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 23280a708f8fSGustavo F. Padovan char req[64]; 23290a708f8fSGustavo F. Padovan 23300a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 23310a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 23320a708f8fSGustavo F. Padovan goto done; 23330a708f8fSGustavo F. Padovan } 23340a708f8fSGustavo F. Padovan 23350a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 23360a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 23370a708f8fSGustavo F. Padovan len = l2cap_parse_conf_rsp(sk, rsp->data, 23380a708f8fSGustavo F. Padovan len, req, &result); 23390a708f8fSGustavo F. Padovan if (len < 0) { 23400a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 23410a708f8fSGustavo F. Padovan goto done; 23420a708f8fSGustavo F. Padovan } 23430a708f8fSGustavo F. Padovan 23440a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 23450a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 23460a708f8fSGustavo F. Padovan l2cap_pi(sk)->num_conf_req++; 23470a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 23480a708f8fSGustavo F. Padovan goto done; 23490a708f8fSGustavo F. Padovan break; 23500a708f8fSGustavo F. Padovan } 23510a708f8fSGustavo F. Padovan 23520a708f8fSGustavo F. Padovan default: 23530a708f8fSGustavo F. Padovan sk->sk_err = ECONNRESET; 23540a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ * 5); 23550a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 23560a708f8fSGustavo F. Padovan goto done; 23570a708f8fSGustavo F. Padovan } 23580a708f8fSGustavo F. Padovan 23590a708f8fSGustavo F. Padovan if (flags & 0x01) 23600a708f8fSGustavo F. Padovan goto done; 23610a708f8fSGustavo F. Padovan 23620a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; 23630a708f8fSGustavo F. Padovan 23640a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { 23650a708f8fSGustavo F. Padovan set_default_fcs(l2cap_pi(sk)); 23660a708f8fSGustavo F. Padovan 23670a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 23680a708f8fSGustavo F. Padovan l2cap_pi(sk)->next_tx_seq = 0; 23690a708f8fSGustavo F. Padovan l2cap_pi(sk)->expected_tx_seq = 0; 23700a708f8fSGustavo F. Padovan __skb_queue_head_init(TX_QUEUE(sk)); 23710a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) 23720a708f8fSGustavo F. Padovan l2cap_ertm_init(sk); 23730a708f8fSGustavo F. Padovan 23740a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 23750a708f8fSGustavo F. Padovan } 23760a708f8fSGustavo F. Padovan 23770a708f8fSGustavo F. Padovan done: 23780a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 23790a708f8fSGustavo F. Padovan return 0; 23800a708f8fSGustavo F. Padovan } 23810a708f8fSGustavo F. Padovan 23820a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 23830a708f8fSGustavo F. Padovan { 23840a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 23850a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 23860a708f8fSGustavo F. Padovan u16 dcid, scid; 238748454079SGustavo F. Padovan struct l2cap_chan *chan; 23880a708f8fSGustavo F. Padovan struct sock *sk; 23890a708f8fSGustavo F. Padovan 23900a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 23910a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 23920a708f8fSGustavo F. Padovan 23930a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 23940a708f8fSGustavo F. Padovan 2395baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 239648454079SGustavo F. Padovan if (!chan) 23970a708f8fSGustavo F. Padovan return 0; 23980a708f8fSGustavo F. Padovan 239948454079SGustavo F. Padovan sk = chan->sk; 240048454079SGustavo F. Padovan 24010a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 24020a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 24030a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 24040a708f8fSGustavo F. Padovan 24050a708f8fSGustavo F. Padovan sk->sk_shutdown = SHUTDOWN_MASK; 24060a708f8fSGustavo F. Padovan 24070a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 24080a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 24090a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 24100a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 24110a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 5); 24120a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24130a708f8fSGustavo F. Padovan return 0; 24140a708f8fSGustavo F. Padovan } 24150a708f8fSGustavo F. Padovan 241648454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 24170a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24180a708f8fSGustavo F. Padovan 24190a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 24200a708f8fSGustavo F. Padovan return 0; 24210a708f8fSGustavo F. Padovan } 24220a708f8fSGustavo F. Padovan 24230a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24240a708f8fSGustavo F. Padovan { 24250a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 24260a708f8fSGustavo F. Padovan u16 dcid, scid; 242748454079SGustavo F. Padovan struct l2cap_chan *chan; 24280a708f8fSGustavo F. Padovan struct sock *sk; 24290a708f8fSGustavo F. Padovan 24300a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 24310a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 24320a708f8fSGustavo F. Padovan 24330a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 24340a708f8fSGustavo F. Padovan 2435baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 243648454079SGustavo F. Padovan if (!chan) 24370a708f8fSGustavo F. Padovan return 0; 24380a708f8fSGustavo F. Padovan 243948454079SGustavo F. Padovan sk = chan->sk; 244048454079SGustavo F. Padovan 24410a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 24420a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 24430a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 24440a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 24450a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 5); 24460a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24470a708f8fSGustavo F. Padovan return 0; 24480a708f8fSGustavo F. Padovan } 24490a708f8fSGustavo F. Padovan 245048454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 24510a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24520a708f8fSGustavo F. Padovan 24530a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 24540a708f8fSGustavo F. Padovan return 0; 24550a708f8fSGustavo F. Padovan } 24560a708f8fSGustavo F. Padovan 24570a708f8fSGustavo F. Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24580a708f8fSGustavo F. Padovan { 24590a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 24600a708f8fSGustavo F. Padovan u16 type; 24610a708f8fSGustavo F. Padovan 24620a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 24630a708f8fSGustavo F. Padovan 24640a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 24650a708f8fSGustavo F. Padovan 24660a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 24670a708f8fSGustavo F. Padovan u8 buf[8]; 24680a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 24690a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 24700a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 24710a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 24720a708f8fSGustavo F. Padovan if (!disable_ertm) 24730a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 24740a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 24750a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 24760a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 24770a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 24780a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 24790a708f8fSGustavo F. Padovan u8 buf[12]; 24800a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 24810a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 24820a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 24830a708f8fSGustavo F. Padovan memcpy(buf + 4, l2cap_fixed_chan, 8); 24840a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 24850a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 24860a708f8fSGustavo F. Padovan } else { 24870a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 24880a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 24890a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); 24900a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 24910a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(rsp), &rsp); 24920a708f8fSGustavo F. Padovan } 24930a708f8fSGustavo F. Padovan 24940a708f8fSGustavo F. Padovan return 0; 24950a708f8fSGustavo F. Padovan } 24960a708f8fSGustavo F. Padovan 24970a708f8fSGustavo F. Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24980a708f8fSGustavo F. Padovan { 24990a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 25000a708f8fSGustavo F. Padovan u16 type, result; 25010a708f8fSGustavo F. Padovan 25020a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 25030a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 25040a708f8fSGustavo F. Padovan 25050a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 25060a708f8fSGustavo F. Padovan 2507e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 2508e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 2509e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 2510e90165beSAndrei Emeltchenko return 0; 2511e90165beSAndrei Emeltchenko 25120a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 25130a708f8fSGustavo F. Padovan 25140a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 25150a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 25160a708f8fSGustavo F. Padovan conn->info_ident = 0; 25170a708f8fSGustavo F. Padovan 25180a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 25190a708f8fSGustavo F. Padovan 25200a708f8fSGustavo F. Padovan return 0; 25210a708f8fSGustavo F. Padovan } 25220a708f8fSGustavo F. Padovan 25230a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 25240a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 25250a708f8fSGustavo F. Padovan 25260a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 25270a708f8fSGustavo F. Padovan struct l2cap_info_req req; 25280a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 25290a708f8fSGustavo F. Padovan 25300a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 25310a708f8fSGustavo F. Padovan 25320a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 25330a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 25340a708f8fSGustavo F. Padovan } else { 25350a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 25360a708f8fSGustavo F. Padovan conn->info_ident = 0; 25370a708f8fSGustavo F. Padovan 25380a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 25390a708f8fSGustavo F. Padovan } 25400a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 25410a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 25420a708f8fSGustavo F. Padovan conn->info_ident = 0; 25430a708f8fSGustavo F. Padovan 25440a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 25450a708f8fSGustavo F. Padovan } 25460a708f8fSGustavo F. Padovan 25470a708f8fSGustavo F. Padovan return 0; 25480a708f8fSGustavo F. Padovan } 25490a708f8fSGustavo F. Padovan 2550e2174ca4SGustavo F. Padovan static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, 2551de73115aSClaudio Takahasi u16 to_multiplier) 2552de73115aSClaudio Takahasi { 2553de73115aSClaudio Takahasi u16 max_latency; 2554de73115aSClaudio Takahasi 2555de73115aSClaudio Takahasi if (min > max || min < 6 || max > 3200) 2556de73115aSClaudio Takahasi return -EINVAL; 2557de73115aSClaudio Takahasi 2558de73115aSClaudio Takahasi if (to_multiplier < 10 || to_multiplier > 3200) 2559de73115aSClaudio Takahasi return -EINVAL; 2560de73115aSClaudio Takahasi 2561de73115aSClaudio Takahasi if (max >= to_multiplier * 8) 2562de73115aSClaudio Takahasi return -EINVAL; 2563de73115aSClaudio Takahasi 2564de73115aSClaudio Takahasi max_latency = (to_multiplier * 8 / max) - 1; 2565de73115aSClaudio Takahasi if (latency > 499 || latency > max_latency) 2566de73115aSClaudio Takahasi return -EINVAL; 2567de73115aSClaudio Takahasi 2568de73115aSClaudio Takahasi return 0; 2569de73115aSClaudio Takahasi } 2570de73115aSClaudio Takahasi 2571de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 2572de73115aSClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 2573de73115aSClaudio Takahasi { 2574de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 2575de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 2576de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 2577de73115aSClaudio Takahasi u16 min, max, latency, to_multiplier, cmd_len; 25782ce603ebSClaudio Takahasi int err; 2579de73115aSClaudio Takahasi 2580de73115aSClaudio Takahasi if (!(hcon->link_mode & HCI_LM_MASTER)) 2581de73115aSClaudio Takahasi return -EINVAL; 2582de73115aSClaudio Takahasi 2583de73115aSClaudio Takahasi cmd_len = __le16_to_cpu(cmd->len); 2584de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 2585de73115aSClaudio Takahasi return -EPROTO; 2586de73115aSClaudio Takahasi 2587de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 2588de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 2589de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 2590de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 2591de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 2592de73115aSClaudio Takahasi 2593de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 2594de73115aSClaudio Takahasi min, max, latency, to_multiplier); 2595de73115aSClaudio Takahasi 2596de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 25972ce603ebSClaudio Takahasi 25982ce603ebSClaudio Takahasi err = l2cap_check_conn_param(min, max, latency, to_multiplier); 25992ce603ebSClaudio Takahasi if (err) 2600de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 2601de73115aSClaudio Takahasi else 2602de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 2603de73115aSClaudio Takahasi 2604de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 2605de73115aSClaudio Takahasi sizeof(rsp), &rsp); 2606de73115aSClaudio Takahasi 26072ce603ebSClaudio Takahasi if (!err) 26082ce603ebSClaudio Takahasi hci_le_conn_update(hcon, min, max, latency, to_multiplier); 26092ce603ebSClaudio Takahasi 2610de73115aSClaudio Takahasi return 0; 2611de73115aSClaudio Takahasi } 2612de73115aSClaudio Takahasi 26133300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 26143300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 26153300d9a9SClaudio Takahasi { 26163300d9a9SClaudio Takahasi int err = 0; 26173300d9a9SClaudio Takahasi 26183300d9a9SClaudio Takahasi switch (cmd->code) { 26193300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 26203300d9a9SClaudio Takahasi l2cap_command_rej(conn, cmd, data); 26213300d9a9SClaudio Takahasi break; 26223300d9a9SClaudio Takahasi 26233300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 26243300d9a9SClaudio Takahasi err = l2cap_connect_req(conn, cmd, data); 26253300d9a9SClaudio Takahasi break; 26263300d9a9SClaudio Takahasi 26273300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 26283300d9a9SClaudio Takahasi err = l2cap_connect_rsp(conn, cmd, data); 26293300d9a9SClaudio Takahasi break; 26303300d9a9SClaudio Takahasi 26313300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 26323300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 26333300d9a9SClaudio Takahasi break; 26343300d9a9SClaudio Takahasi 26353300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 26363300d9a9SClaudio Takahasi err = l2cap_config_rsp(conn, cmd, data); 26373300d9a9SClaudio Takahasi break; 26383300d9a9SClaudio Takahasi 26393300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 26403300d9a9SClaudio Takahasi err = l2cap_disconnect_req(conn, cmd, data); 26413300d9a9SClaudio Takahasi break; 26423300d9a9SClaudio Takahasi 26433300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 26443300d9a9SClaudio Takahasi err = l2cap_disconnect_rsp(conn, cmd, data); 26453300d9a9SClaudio Takahasi break; 26463300d9a9SClaudio Takahasi 26473300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 26483300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 26493300d9a9SClaudio Takahasi break; 26503300d9a9SClaudio Takahasi 26513300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 26523300d9a9SClaudio Takahasi break; 26533300d9a9SClaudio Takahasi 26543300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 26553300d9a9SClaudio Takahasi err = l2cap_information_req(conn, cmd, data); 26563300d9a9SClaudio Takahasi break; 26573300d9a9SClaudio Takahasi 26583300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 26593300d9a9SClaudio Takahasi err = l2cap_information_rsp(conn, cmd, data); 26603300d9a9SClaudio Takahasi break; 26613300d9a9SClaudio Takahasi 26623300d9a9SClaudio Takahasi default: 26633300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 26643300d9a9SClaudio Takahasi err = -EINVAL; 26653300d9a9SClaudio Takahasi break; 26663300d9a9SClaudio Takahasi } 26673300d9a9SClaudio Takahasi 26683300d9a9SClaudio Takahasi return err; 26693300d9a9SClaudio Takahasi } 26703300d9a9SClaudio Takahasi 26713300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 26723300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 26733300d9a9SClaudio Takahasi { 26743300d9a9SClaudio Takahasi switch (cmd->code) { 26753300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 26763300d9a9SClaudio Takahasi return 0; 26773300d9a9SClaudio Takahasi 26783300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 2679de73115aSClaudio Takahasi return l2cap_conn_param_update_req(conn, cmd, data); 26803300d9a9SClaudio Takahasi 26813300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 26823300d9a9SClaudio Takahasi return 0; 26833300d9a9SClaudio Takahasi 26843300d9a9SClaudio Takahasi default: 26853300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 26863300d9a9SClaudio Takahasi return -EINVAL; 26873300d9a9SClaudio Takahasi } 26883300d9a9SClaudio Takahasi } 26893300d9a9SClaudio Takahasi 26903300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 26913300d9a9SClaudio Takahasi struct sk_buff *skb) 26920a708f8fSGustavo F. Padovan { 26930a708f8fSGustavo F. Padovan u8 *data = skb->data; 26940a708f8fSGustavo F. Padovan int len = skb->len; 26950a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 26963300d9a9SClaudio Takahasi int err; 26970a708f8fSGustavo F. Padovan 26980a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 26990a708f8fSGustavo F. Padovan 27000a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 27010a708f8fSGustavo F. Padovan u16 cmd_len; 27020a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 27030a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 27040a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 27050a708f8fSGustavo F. Padovan 27060a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 27070a708f8fSGustavo F. Padovan 27080a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); 27090a708f8fSGustavo F. Padovan 27100a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 27110a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 27120a708f8fSGustavo F. Padovan break; 27130a708f8fSGustavo F. Padovan } 27140a708f8fSGustavo F. Padovan 27153300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 27163300d9a9SClaudio Takahasi err = l2cap_le_sig_cmd(conn, &cmd, data); 27173300d9a9SClaudio Takahasi else 27183300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 27190a708f8fSGustavo F. Padovan 27200a708f8fSGustavo F. Padovan if (err) { 27210a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 27222c6d1a2eSGustavo F. Padovan 27232c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 27240a708f8fSGustavo F. Padovan 27250a708f8fSGustavo F. Padovan /* FIXME: Map err to a valid reason */ 27260a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0); 27270a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); 27280a708f8fSGustavo F. Padovan } 27290a708f8fSGustavo F. Padovan 27300a708f8fSGustavo F. Padovan data += cmd_len; 27310a708f8fSGustavo F. Padovan len -= cmd_len; 27320a708f8fSGustavo F. Padovan } 27330a708f8fSGustavo F. Padovan 27340a708f8fSGustavo F. Padovan kfree_skb(skb); 27350a708f8fSGustavo F. Padovan } 27360a708f8fSGustavo F. Padovan 27370a708f8fSGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) 27380a708f8fSGustavo F. Padovan { 27390a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 27400a708f8fSGustavo F. Padovan int hdr_size = L2CAP_HDR_SIZE + 2; 27410a708f8fSGustavo F. Padovan 27420a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 27430a708f8fSGustavo F. Padovan skb_trim(skb, skb->len - 2); 27440a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 27450a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 27460a708f8fSGustavo F. Padovan 27470a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 27480a708f8fSGustavo F. Padovan return -EBADMSG; 27490a708f8fSGustavo F. Padovan } 27500a708f8fSGustavo F. Padovan return 0; 27510a708f8fSGustavo F. Padovan } 27520a708f8fSGustavo F. Padovan 27530a708f8fSGustavo F. Padovan static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) 27540a708f8fSGustavo F. Padovan { 27550a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 27560a708f8fSGustavo F. Padovan u16 control = 0; 27570a708f8fSGustavo F. Padovan 27580a708f8fSGustavo F. Padovan pi->frames_sent = 0; 27590a708f8fSGustavo F. Padovan 27600a708f8fSGustavo F. Padovan control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 27610a708f8fSGustavo F. Padovan 27620a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { 27630a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 27640a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 27650a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_RNR_SENT; 27660a708f8fSGustavo F. Padovan } 27670a708f8fSGustavo F. Padovan 27680a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) 27690a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 27700a708f8fSGustavo F. Padovan 27710a708f8fSGustavo F. Padovan l2cap_ertm_send(sk); 27720a708f8fSGustavo F. Padovan 27730a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && 27740a708f8fSGustavo F. Padovan pi->frames_sent == 0) { 27750a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 27760a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 27770a708f8fSGustavo F. Padovan } 27780a708f8fSGustavo F. Padovan } 27790a708f8fSGustavo F. Padovan 27800a708f8fSGustavo F. Padovan static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) 27810a708f8fSGustavo F. Padovan { 27820a708f8fSGustavo F. Padovan struct sk_buff *next_skb; 27830a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 27840a708f8fSGustavo F. Padovan int tx_seq_offset, next_tx_seq_offset; 27850a708f8fSGustavo F. Padovan 27860a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 27870a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 27880a708f8fSGustavo F. Padovan 27890a708f8fSGustavo F. Padovan next_skb = skb_peek(SREJ_QUEUE(sk)); 27900a708f8fSGustavo F. Padovan if (!next_skb) { 27910a708f8fSGustavo F. Padovan __skb_queue_tail(SREJ_QUEUE(sk), skb); 27920a708f8fSGustavo F. Padovan return 0; 27930a708f8fSGustavo F. Padovan } 27940a708f8fSGustavo F. Padovan 27950a708f8fSGustavo F. Padovan tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; 27960a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 27970a708f8fSGustavo F. Padovan tx_seq_offset += 64; 27980a708f8fSGustavo F. Padovan 27990a708f8fSGustavo F. Padovan do { 28000a708f8fSGustavo F. Padovan if (bt_cb(next_skb)->tx_seq == tx_seq) 28010a708f8fSGustavo F. Padovan return -EINVAL; 28020a708f8fSGustavo F. Padovan 28030a708f8fSGustavo F. Padovan next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - 28040a708f8fSGustavo F. Padovan pi->buffer_seq) % 64; 28050a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 28060a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 28070a708f8fSGustavo F. Padovan 28080a708f8fSGustavo F. Padovan if (next_tx_seq_offset > tx_seq_offset) { 28090a708f8fSGustavo F. Padovan __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); 28100a708f8fSGustavo F. Padovan return 0; 28110a708f8fSGustavo F. Padovan } 28120a708f8fSGustavo F. Padovan 28130a708f8fSGustavo F. Padovan if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) 28140a708f8fSGustavo F. Padovan break; 28150a708f8fSGustavo F. Padovan 28160a708f8fSGustavo F. Padovan } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); 28170a708f8fSGustavo F. Padovan 28180a708f8fSGustavo F. Padovan __skb_queue_tail(SREJ_QUEUE(sk), skb); 28190a708f8fSGustavo F. Padovan 28200a708f8fSGustavo F. Padovan return 0; 28210a708f8fSGustavo F. Padovan } 28220a708f8fSGustavo F. Padovan 28230a708f8fSGustavo F. Padovan static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) 28240a708f8fSGustavo F. Padovan { 28250a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 28260a708f8fSGustavo F. Padovan struct sk_buff *_skb; 28270a708f8fSGustavo F. Padovan int err; 28280a708f8fSGustavo F. Padovan 28290a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 28300a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 28310a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SAR_SDU) 28320a708f8fSGustavo F. Padovan goto drop; 28330a708f8fSGustavo F. Padovan 28340a708f8fSGustavo F. Padovan err = sock_queue_rcv_skb(sk, skb); 28350a708f8fSGustavo F. Padovan if (!err) 28360a708f8fSGustavo F. Padovan return err; 28370a708f8fSGustavo F. Padovan 28380a708f8fSGustavo F. Padovan break; 28390a708f8fSGustavo F. Padovan 28400a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 28410a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SAR_SDU) 28420a708f8fSGustavo F. Padovan goto drop; 28430a708f8fSGustavo F. Padovan 28440a708f8fSGustavo F. Padovan pi->sdu_len = get_unaligned_le16(skb->data); 28450a708f8fSGustavo F. Padovan 28460a708f8fSGustavo F. Padovan if (pi->sdu_len > pi->imtu) 28470a708f8fSGustavo F. Padovan goto disconnect; 28480a708f8fSGustavo F. Padovan 28490a708f8fSGustavo F. Padovan pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); 28500a708f8fSGustavo F. Padovan if (!pi->sdu) 28510a708f8fSGustavo F. Padovan return -ENOMEM; 28520a708f8fSGustavo F. Padovan 28530a708f8fSGustavo F. Padovan /* pull sdu_len bytes only after alloc, because of Local Busy 28540a708f8fSGustavo F. Padovan * condition we have to be sure that this will be executed 28550a708f8fSGustavo F. Padovan * only once, i.e., when alloc does not fail */ 28560a708f8fSGustavo F. Padovan skb_pull(skb, 2); 28570a708f8fSGustavo F. Padovan 28580a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 28590a708f8fSGustavo F. Padovan 28600a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SAR_SDU; 28610a708f8fSGustavo F. Padovan pi->partial_sdu_len = skb->len; 28620a708f8fSGustavo F. Padovan break; 28630a708f8fSGustavo F. Padovan 28640a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 28650a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) 28660a708f8fSGustavo F. Padovan goto disconnect; 28670a708f8fSGustavo F. Padovan 28680a708f8fSGustavo F. Padovan if (!pi->sdu) 28690a708f8fSGustavo F. Padovan goto disconnect; 28700a708f8fSGustavo F. Padovan 28710a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 28720a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->sdu_len) 28730a708f8fSGustavo F. Padovan goto drop; 28740a708f8fSGustavo F. Padovan 28750a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 28760a708f8fSGustavo F. Padovan 28770a708f8fSGustavo F. Padovan break; 28780a708f8fSGustavo F. Padovan 28790a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 28800a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) 28810a708f8fSGustavo F. Padovan goto disconnect; 28820a708f8fSGustavo F. Padovan 28830a708f8fSGustavo F. Padovan if (!pi->sdu) 28840a708f8fSGustavo F. Padovan goto disconnect; 28850a708f8fSGustavo F. Padovan 28860a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { 28870a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 28880a708f8fSGustavo F. Padovan 28890a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->imtu) 28900a708f8fSGustavo F. Padovan goto drop; 28910a708f8fSGustavo F. Padovan 28920a708f8fSGustavo F. Padovan if (pi->partial_sdu_len != pi->sdu_len) 28930a708f8fSGustavo F. Padovan goto drop; 28940a708f8fSGustavo F. Padovan 28950a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 28960a708f8fSGustavo F. Padovan } 28970a708f8fSGustavo F. Padovan 28980a708f8fSGustavo F. Padovan _skb = skb_clone(pi->sdu, GFP_ATOMIC); 28990a708f8fSGustavo F. Padovan if (!_skb) { 29000a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SAR_RETRY; 29010a708f8fSGustavo F. Padovan return -ENOMEM; 29020a708f8fSGustavo F. Padovan } 29030a708f8fSGustavo F. Padovan 29040a708f8fSGustavo F. Padovan err = sock_queue_rcv_skb(sk, _skb); 29050a708f8fSGustavo F. Padovan if (err < 0) { 29060a708f8fSGustavo F. Padovan kfree_skb(_skb); 29070a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SAR_RETRY; 29080a708f8fSGustavo F. Padovan return err; 29090a708f8fSGustavo F. Padovan } 29100a708f8fSGustavo F. Padovan 29110a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; 29120a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SAR_SDU; 29130a708f8fSGustavo F. Padovan 29140a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 29150a708f8fSGustavo F. Padovan break; 29160a708f8fSGustavo F. Padovan } 29170a708f8fSGustavo F. Padovan 29180a708f8fSGustavo F. Padovan kfree_skb(skb); 29190a708f8fSGustavo F. Padovan return 0; 29200a708f8fSGustavo F. Padovan 29210a708f8fSGustavo F. Padovan drop: 29220a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 29230a708f8fSGustavo F. Padovan pi->sdu = NULL; 29240a708f8fSGustavo F. Padovan 29250a708f8fSGustavo F. Padovan disconnect: 29260a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 29270a708f8fSGustavo F. Padovan kfree_skb(skb); 29280a708f8fSGustavo F. Padovan return 0; 29290a708f8fSGustavo F. Padovan } 29300a708f8fSGustavo F. Padovan 29310a708f8fSGustavo F. Padovan static int l2cap_try_push_rx_skb(struct sock *sk) 29320a708f8fSGustavo F. Padovan { 29330a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 29340a708f8fSGustavo F. Padovan struct sk_buff *skb; 29350a708f8fSGustavo F. Padovan u16 control; 29360a708f8fSGustavo F. Padovan int err; 29370a708f8fSGustavo F. Padovan 29380a708f8fSGustavo F. Padovan while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { 29390a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 29400a708f8fSGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(sk, skb, control); 29410a708f8fSGustavo F. Padovan if (err < 0) { 29420a708f8fSGustavo F. Padovan skb_queue_head(BUSY_QUEUE(sk), skb); 29430a708f8fSGustavo F. Padovan return -EBUSY; 29440a708f8fSGustavo F. Padovan } 29450a708f8fSGustavo F. Padovan 29460a708f8fSGustavo F. Padovan pi->buffer_seq = (pi->buffer_seq + 1) % 64; 29470a708f8fSGustavo F. Padovan } 29480a708f8fSGustavo F. Padovan 29490a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) 29500a708f8fSGustavo F. Padovan goto done; 29510a708f8fSGustavo F. Padovan 29520a708f8fSGustavo F. Padovan control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 29530a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; 29540a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 29550a708f8fSGustavo F. Padovan l2cap_pi(sk)->retry_count = 1; 29560a708f8fSGustavo F. Padovan 29570a708f8fSGustavo F. Padovan del_timer(&pi->retrans_timer); 29580a708f8fSGustavo F. Padovan __mod_monitor_timer(); 29590a708f8fSGustavo F. Padovan 29600a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; 29610a708f8fSGustavo F. Padovan 29620a708f8fSGustavo F. Padovan done: 29630a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; 29640a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_RNR_SENT; 29650a708f8fSGustavo F. Padovan 29660a708f8fSGustavo F. Padovan BT_DBG("sk %p, Exit local busy", sk); 29670a708f8fSGustavo F. Padovan 29680a708f8fSGustavo F. Padovan return 0; 29690a708f8fSGustavo F. Padovan } 29700a708f8fSGustavo F. Padovan 29710a708f8fSGustavo F. Padovan static void l2cap_busy_work(struct work_struct *work) 29720a708f8fSGustavo F. Padovan { 29730a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 29740a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = 29750a708f8fSGustavo F. Padovan container_of(work, struct l2cap_pinfo, busy_work); 29760a708f8fSGustavo F. Padovan struct sock *sk = (struct sock *)pi; 29770a708f8fSGustavo F. Padovan int n_tries = 0, timeo = HZ/5, err; 29780a708f8fSGustavo F. Padovan struct sk_buff *skb; 29790a708f8fSGustavo F. Padovan 29800a708f8fSGustavo F. Padovan lock_sock(sk); 29810a708f8fSGustavo F. Padovan 29820a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 29830a708f8fSGustavo F. Padovan while ((skb = skb_peek(BUSY_QUEUE(sk)))) { 29840a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 29850a708f8fSGustavo F. Padovan 29860a708f8fSGustavo F. Padovan if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { 29870a708f8fSGustavo F. Padovan err = -EBUSY; 29880a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, EBUSY); 29890a708f8fSGustavo F. Padovan break; 29900a708f8fSGustavo F. Padovan } 29910a708f8fSGustavo F. Padovan 29920a708f8fSGustavo F. Padovan if (!timeo) 29930a708f8fSGustavo F. Padovan timeo = HZ/5; 29940a708f8fSGustavo F. Padovan 29950a708f8fSGustavo F. Padovan if (signal_pending(current)) { 29960a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 29970a708f8fSGustavo F. Padovan break; 29980a708f8fSGustavo F. Padovan } 29990a708f8fSGustavo F. Padovan 30000a708f8fSGustavo F. Padovan release_sock(sk); 30010a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 30020a708f8fSGustavo F. Padovan lock_sock(sk); 30030a708f8fSGustavo F. Padovan 30040a708f8fSGustavo F. Padovan err = sock_error(sk); 30050a708f8fSGustavo F. Padovan if (err) 30060a708f8fSGustavo F. Padovan break; 30070a708f8fSGustavo F. Padovan 30080a708f8fSGustavo F. Padovan if (l2cap_try_push_rx_skb(sk) == 0) 30090a708f8fSGustavo F. Padovan break; 30100a708f8fSGustavo F. Padovan } 30110a708f8fSGustavo F. Padovan 30120a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 30130a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 30140a708f8fSGustavo F. Padovan 30150a708f8fSGustavo F. Padovan release_sock(sk); 30160a708f8fSGustavo F. Padovan } 30170a708f8fSGustavo F. Padovan 30180a708f8fSGustavo F. Padovan static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) 30190a708f8fSGustavo F. Padovan { 30200a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 30210a708f8fSGustavo F. Padovan int sctrl, err; 30220a708f8fSGustavo F. Padovan 30230a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { 30240a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 30250a708f8fSGustavo F. Padovan __skb_queue_tail(BUSY_QUEUE(sk), skb); 30260a708f8fSGustavo F. Padovan return l2cap_try_push_rx_skb(sk); 30270a708f8fSGustavo F. Padovan 30280a708f8fSGustavo F. Padovan 30290a708f8fSGustavo F. Padovan } 30300a708f8fSGustavo F. Padovan 30310a708f8fSGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(sk, skb, control); 30320a708f8fSGustavo F. Padovan if (err >= 0) { 30330a708f8fSGustavo F. Padovan pi->buffer_seq = (pi->buffer_seq + 1) % 64; 30340a708f8fSGustavo F. Padovan return err; 30350a708f8fSGustavo F. Padovan } 30360a708f8fSGustavo F. Padovan 30370a708f8fSGustavo F. Padovan /* Busy Condition */ 30380a708f8fSGustavo F. Padovan BT_DBG("sk %p, Enter local busy", sk); 30390a708f8fSGustavo F. Padovan 30400a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; 30410a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 30420a708f8fSGustavo F. Padovan __skb_queue_tail(BUSY_QUEUE(sk), skb); 30430a708f8fSGustavo F. Padovan 30440a708f8fSGustavo F. Padovan sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 30450a708f8fSGustavo F. Padovan sctrl |= L2CAP_SUPER_RCV_NOT_READY; 30460a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, sctrl); 30470a708f8fSGustavo F. Padovan 30480a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_RNR_SENT; 30490a708f8fSGustavo F. Padovan 30500a708f8fSGustavo F. Padovan del_timer(&pi->ack_timer); 30510a708f8fSGustavo F. Padovan 30520a708f8fSGustavo F. Padovan queue_work(_busy_wq, &pi->busy_work); 30530a708f8fSGustavo F. Padovan 30540a708f8fSGustavo F. Padovan return err; 30550a708f8fSGustavo F. Padovan } 30560a708f8fSGustavo F. Padovan 30570a708f8fSGustavo F. Padovan static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) 30580a708f8fSGustavo F. Padovan { 30590a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 30600a708f8fSGustavo F. Padovan struct sk_buff *_skb; 30610a708f8fSGustavo F. Padovan int err = -EINVAL; 30620a708f8fSGustavo F. Padovan 30630a708f8fSGustavo F. Padovan /* 30640a708f8fSGustavo F. Padovan * TODO: We have to notify the userland if some data is lost with the 30650a708f8fSGustavo F. Padovan * Streaming Mode. 30660a708f8fSGustavo F. Padovan */ 30670a708f8fSGustavo F. Padovan 30680a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 30690a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 30700a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SAR_SDU) { 30710a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 30720a708f8fSGustavo F. Padovan break; 30730a708f8fSGustavo F. Padovan } 30740a708f8fSGustavo F. Padovan 30750a708f8fSGustavo F. Padovan err = sock_queue_rcv_skb(sk, skb); 30760a708f8fSGustavo F. Padovan if (!err) 30770a708f8fSGustavo F. Padovan return 0; 30780a708f8fSGustavo F. Padovan 30790a708f8fSGustavo F. Padovan break; 30800a708f8fSGustavo F. Padovan 30810a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 30820a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SAR_SDU) { 30830a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 30840a708f8fSGustavo F. Padovan break; 30850a708f8fSGustavo F. Padovan } 30860a708f8fSGustavo F. Padovan 30870a708f8fSGustavo F. Padovan pi->sdu_len = get_unaligned_le16(skb->data); 30880a708f8fSGustavo F. Padovan skb_pull(skb, 2); 30890a708f8fSGustavo F. Padovan 30900a708f8fSGustavo F. Padovan if (pi->sdu_len > pi->imtu) { 30910a708f8fSGustavo F. Padovan err = -EMSGSIZE; 30920a708f8fSGustavo F. Padovan break; 30930a708f8fSGustavo F. Padovan } 30940a708f8fSGustavo F. Padovan 30950a708f8fSGustavo F. Padovan pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); 30960a708f8fSGustavo F. Padovan if (!pi->sdu) { 30970a708f8fSGustavo F. Padovan err = -ENOMEM; 30980a708f8fSGustavo F. Padovan break; 30990a708f8fSGustavo F. Padovan } 31000a708f8fSGustavo F. Padovan 31010a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 31020a708f8fSGustavo F. Padovan 31030a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SAR_SDU; 31040a708f8fSGustavo F. Padovan pi->partial_sdu_len = skb->len; 31050a708f8fSGustavo F. Padovan err = 0; 31060a708f8fSGustavo F. Padovan break; 31070a708f8fSGustavo F. Padovan 31080a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 31090a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) 31100a708f8fSGustavo F. Padovan break; 31110a708f8fSGustavo F. Padovan 31120a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 31130a708f8fSGustavo F. Padovan 31140a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 31150a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->sdu_len) 31160a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 31170a708f8fSGustavo F. Padovan else 31180a708f8fSGustavo F. Padovan err = 0; 31190a708f8fSGustavo F. Padovan 31200a708f8fSGustavo F. Padovan break; 31210a708f8fSGustavo F. Padovan 31220a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 31230a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) 31240a708f8fSGustavo F. Padovan break; 31250a708f8fSGustavo F. Padovan 31260a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 31270a708f8fSGustavo F. Padovan 31280a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SAR_SDU; 31290a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 31300a708f8fSGustavo F. Padovan 31310a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->imtu) 31320a708f8fSGustavo F. Padovan goto drop; 31330a708f8fSGustavo F. Padovan 31340a708f8fSGustavo F. Padovan if (pi->partial_sdu_len == pi->sdu_len) { 31350a708f8fSGustavo F. Padovan _skb = skb_clone(pi->sdu, GFP_ATOMIC); 31360a708f8fSGustavo F. Padovan err = sock_queue_rcv_skb(sk, _skb); 31370a708f8fSGustavo F. Padovan if (err < 0) 31380a708f8fSGustavo F. Padovan kfree_skb(_skb); 31390a708f8fSGustavo F. Padovan } 31400a708f8fSGustavo F. Padovan err = 0; 31410a708f8fSGustavo F. Padovan 31420a708f8fSGustavo F. Padovan drop: 31430a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 31440a708f8fSGustavo F. Padovan break; 31450a708f8fSGustavo F. Padovan } 31460a708f8fSGustavo F. Padovan 31470a708f8fSGustavo F. Padovan kfree_skb(skb); 31480a708f8fSGustavo F. Padovan return err; 31490a708f8fSGustavo F. Padovan } 31500a708f8fSGustavo F. Padovan 31510a708f8fSGustavo F. Padovan static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) 31520a708f8fSGustavo F. Padovan { 31530a708f8fSGustavo F. Padovan struct sk_buff *skb; 31540a708f8fSGustavo F. Padovan u16 control; 31550a708f8fSGustavo F. Padovan 31560a708f8fSGustavo F. Padovan while ((skb = skb_peek(SREJ_QUEUE(sk)))) { 31570a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq != tx_seq) 31580a708f8fSGustavo F. Padovan break; 31590a708f8fSGustavo F. Padovan 31600a708f8fSGustavo F. Padovan skb = skb_dequeue(SREJ_QUEUE(sk)); 31610a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 31620a708f8fSGustavo F. Padovan l2cap_ertm_reassembly_sdu(sk, skb, control); 31630a708f8fSGustavo F. Padovan l2cap_pi(sk)->buffer_seq_srej = 31640a708f8fSGustavo F. Padovan (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; 31650a708f8fSGustavo F. Padovan tx_seq = (tx_seq + 1) % 64; 31660a708f8fSGustavo F. Padovan } 31670a708f8fSGustavo F. Padovan } 31680a708f8fSGustavo F. Padovan 31690a708f8fSGustavo F. Padovan static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) 31700a708f8fSGustavo F. Padovan { 31710a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 31720a708f8fSGustavo F. Padovan struct srej_list *l, *tmp; 31730a708f8fSGustavo F. Padovan u16 control; 31740a708f8fSGustavo F. Padovan 31750a708f8fSGustavo F. Padovan list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { 31760a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 31770a708f8fSGustavo F. Padovan list_del(&l->list); 31780a708f8fSGustavo F. Padovan kfree(l); 31790a708f8fSGustavo F. Padovan return; 31800a708f8fSGustavo F. Padovan } 31810a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 31820a708f8fSGustavo F. Padovan control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 31830a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 31840a708f8fSGustavo F. Padovan list_del(&l->list); 31850a708f8fSGustavo F. Padovan list_add_tail(&l->list, SREJ_LIST(sk)); 31860a708f8fSGustavo F. Padovan } 31870a708f8fSGustavo F. Padovan } 31880a708f8fSGustavo F. Padovan 31890a708f8fSGustavo F. Padovan static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) 31900a708f8fSGustavo F. Padovan { 31910a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 31920a708f8fSGustavo F. Padovan struct srej_list *new; 31930a708f8fSGustavo F. Padovan u16 control; 31940a708f8fSGustavo F. Padovan 31950a708f8fSGustavo F. Padovan while (tx_seq != pi->expected_tx_seq) { 31960a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 31970a708f8fSGustavo F. Padovan control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 31980a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 31990a708f8fSGustavo F. Padovan 32000a708f8fSGustavo F. Padovan new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); 32010a708f8fSGustavo F. Padovan new->tx_seq = pi->expected_tx_seq; 32020a708f8fSGustavo F. Padovan pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; 32030a708f8fSGustavo F. Padovan list_add_tail(&new->list, SREJ_LIST(sk)); 32040a708f8fSGustavo F. Padovan } 32050a708f8fSGustavo F. Padovan pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; 32060a708f8fSGustavo F. Padovan } 32070a708f8fSGustavo F. Padovan 32080a708f8fSGustavo F. Padovan static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) 32090a708f8fSGustavo F. Padovan { 32100a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 32110a708f8fSGustavo F. Padovan u8 tx_seq = __get_txseq(rx_control); 32120a708f8fSGustavo F. Padovan u8 req_seq = __get_reqseq(rx_control); 32130a708f8fSGustavo F. Padovan u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; 32140a708f8fSGustavo F. Padovan int tx_seq_offset, expected_tx_seq_offset; 32150a708f8fSGustavo F. Padovan int num_to_ack = (pi->tx_win/6) + 1; 32160a708f8fSGustavo F. Padovan int err = 0; 32170a708f8fSGustavo F. Padovan 32180a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, 32190a708f8fSGustavo F. Padovan rx_control); 32200a708f8fSGustavo F. Padovan 32210a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 32220a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { 32230a708f8fSGustavo F. Padovan del_timer(&pi->monitor_timer); 32240a708f8fSGustavo F. Padovan if (pi->unacked_frames > 0) 32250a708f8fSGustavo F. Padovan __mod_retrans_timer(); 32260a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_WAIT_F; 32270a708f8fSGustavo F. Padovan } 32280a708f8fSGustavo F. Padovan 32290a708f8fSGustavo F. Padovan pi->expected_ack_seq = req_seq; 32300a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 32310a708f8fSGustavo F. Padovan 32320a708f8fSGustavo F. Padovan if (tx_seq == pi->expected_tx_seq) 32330a708f8fSGustavo F. Padovan goto expected; 32340a708f8fSGustavo F. Padovan 32350a708f8fSGustavo F. Padovan tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; 32360a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 32370a708f8fSGustavo F. Padovan tx_seq_offset += 64; 32380a708f8fSGustavo F. Padovan 32390a708f8fSGustavo F. Padovan /* invalid tx_seq */ 32400a708f8fSGustavo F. Padovan if (tx_seq_offset >= pi->tx_win) { 32410a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 32420a708f8fSGustavo F. Padovan goto drop; 32430a708f8fSGustavo F. Padovan } 32440a708f8fSGustavo F. Padovan 32450a708f8fSGustavo F. Padovan if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) 32460a708f8fSGustavo F. Padovan goto drop; 32470a708f8fSGustavo F. Padovan 32480a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { 32490a708f8fSGustavo F. Padovan struct srej_list *first; 32500a708f8fSGustavo F. Padovan 32510a708f8fSGustavo F. Padovan first = list_first_entry(SREJ_LIST(sk), 32520a708f8fSGustavo F. Padovan struct srej_list, list); 32530a708f8fSGustavo F. Padovan if (tx_seq == first->tx_seq) { 32540a708f8fSGustavo F. Padovan l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); 32550a708f8fSGustavo F. Padovan l2cap_check_srej_gap(sk, tx_seq); 32560a708f8fSGustavo F. Padovan 32570a708f8fSGustavo F. Padovan list_del(&first->list); 32580a708f8fSGustavo F. Padovan kfree(first); 32590a708f8fSGustavo F. Padovan 32600a708f8fSGustavo F. Padovan if (list_empty(SREJ_LIST(sk))) { 32610a708f8fSGustavo F. Padovan pi->buffer_seq = pi->buffer_seq_srej; 32620a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; 32630a708f8fSGustavo F. Padovan l2cap_send_ack(pi); 32640a708f8fSGustavo F. Padovan BT_DBG("sk %p, Exit SREJ_SENT", sk); 32650a708f8fSGustavo F. Padovan } 32660a708f8fSGustavo F. Padovan } else { 32670a708f8fSGustavo F. Padovan struct srej_list *l; 32680a708f8fSGustavo F. Padovan 32690a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 32700a708f8fSGustavo F. Padovan if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) 32710a708f8fSGustavo F. Padovan goto drop; 32720a708f8fSGustavo F. Padovan 32730a708f8fSGustavo F. Padovan list_for_each_entry(l, SREJ_LIST(sk), list) { 32740a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 32750a708f8fSGustavo F. Padovan l2cap_resend_srejframe(sk, tx_seq); 32760a708f8fSGustavo F. Padovan return 0; 32770a708f8fSGustavo F. Padovan } 32780a708f8fSGustavo F. Padovan } 32790a708f8fSGustavo F. Padovan l2cap_send_srejframe(sk, tx_seq); 32800a708f8fSGustavo F. Padovan } 32810a708f8fSGustavo F. Padovan } else { 32820a708f8fSGustavo F. Padovan expected_tx_seq_offset = 32830a708f8fSGustavo F. Padovan (pi->expected_tx_seq - pi->buffer_seq) % 64; 32840a708f8fSGustavo F. Padovan if (expected_tx_seq_offset < 0) 32850a708f8fSGustavo F. Padovan expected_tx_seq_offset += 64; 32860a708f8fSGustavo F. Padovan 32870a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 32880a708f8fSGustavo F. Padovan if (tx_seq_offset < expected_tx_seq_offset) 32890a708f8fSGustavo F. Padovan goto drop; 32900a708f8fSGustavo F. Padovan 32910a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SREJ_SENT; 32920a708f8fSGustavo F. Padovan 32930a708f8fSGustavo F. Padovan BT_DBG("sk %p, Enter SREJ", sk); 32940a708f8fSGustavo F. Padovan 32950a708f8fSGustavo F. Padovan INIT_LIST_HEAD(SREJ_LIST(sk)); 32960a708f8fSGustavo F. Padovan pi->buffer_seq_srej = pi->buffer_seq; 32970a708f8fSGustavo F. Padovan 32980a708f8fSGustavo F. Padovan __skb_queue_head_init(SREJ_QUEUE(sk)); 32990a708f8fSGustavo F. Padovan __skb_queue_head_init(BUSY_QUEUE(sk)); 33000a708f8fSGustavo F. Padovan l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); 33010a708f8fSGustavo F. Padovan 33020a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SEND_PBIT; 33030a708f8fSGustavo F. Padovan 33040a708f8fSGustavo F. Padovan l2cap_send_srejframe(sk, tx_seq); 33050a708f8fSGustavo F. Padovan 33060a708f8fSGustavo F. Padovan del_timer(&pi->ack_timer); 33070a708f8fSGustavo F. Padovan } 33080a708f8fSGustavo F. Padovan return 0; 33090a708f8fSGustavo F. Padovan 33100a708f8fSGustavo F. Padovan expected: 33110a708f8fSGustavo F. Padovan pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; 33120a708f8fSGustavo F. Padovan 33130a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { 33140a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 33150a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 33160a708f8fSGustavo F. Padovan __skb_queue_tail(SREJ_QUEUE(sk), skb); 33170a708f8fSGustavo F. Padovan return 0; 33180a708f8fSGustavo F. Padovan } 33190a708f8fSGustavo F. Padovan 33200a708f8fSGustavo F. Padovan err = l2cap_push_rx_skb(sk, skb, rx_control); 33210a708f8fSGustavo F. Padovan if (err < 0) 33220a708f8fSGustavo F. Padovan return 0; 33230a708f8fSGustavo F. Padovan 33240a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 33250a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_REJ_ACT) 33260a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REJ_ACT; 33270a708f8fSGustavo F. Padovan else 33280a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 33290a708f8fSGustavo F. Padovan } 33300a708f8fSGustavo F. Padovan 33310a708f8fSGustavo F. Padovan __mod_ack_timer(); 33320a708f8fSGustavo F. Padovan 33330a708f8fSGustavo F. Padovan pi->num_acked = (pi->num_acked + 1) % num_to_ack; 33340a708f8fSGustavo F. Padovan if (pi->num_acked == num_to_ack - 1) 33350a708f8fSGustavo F. Padovan l2cap_send_ack(pi); 33360a708f8fSGustavo F. Padovan 33370a708f8fSGustavo F. Padovan return 0; 33380a708f8fSGustavo F. Padovan 33390a708f8fSGustavo F. Padovan drop: 33400a708f8fSGustavo F. Padovan kfree_skb(skb); 33410a708f8fSGustavo F. Padovan return 0; 33420a708f8fSGustavo F. Padovan } 33430a708f8fSGustavo F. Padovan 33440a708f8fSGustavo F. Padovan static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) 33450a708f8fSGustavo F. Padovan { 33460a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 33470a708f8fSGustavo F. Padovan 33480a708f8fSGustavo F. Padovan BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), 33490a708f8fSGustavo F. Padovan rx_control); 33500a708f8fSGustavo F. Padovan 33510a708f8fSGustavo F. Padovan pi->expected_ack_seq = __get_reqseq(rx_control); 33520a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 33530a708f8fSGustavo F. Padovan 33540a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 33550a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SEND_FBIT; 33560a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { 33570a708f8fSGustavo F. Padovan if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && 33580a708f8fSGustavo F. Padovan (pi->unacked_frames > 0)) 33590a708f8fSGustavo F. Padovan __mod_retrans_timer(); 33600a708f8fSGustavo F. Padovan 33610a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 33620a708f8fSGustavo F. Padovan l2cap_send_srejtail(sk); 33630a708f8fSGustavo F. Padovan } else { 33640a708f8fSGustavo F. Padovan l2cap_send_i_or_rr_or_rnr(sk); 33650a708f8fSGustavo F. Padovan } 33660a708f8fSGustavo F. Padovan 33670a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 33680a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 33690a708f8fSGustavo F. Padovan 33700a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_REJ_ACT) 33710a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REJ_ACT; 33720a708f8fSGustavo F. Padovan else 33730a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 33740a708f8fSGustavo F. Padovan 33750a708f8fSGustavo F. Padovan } else { 33760a708f8fSGustavo F. Padovan if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && 33770a708f8fSGustavo F. Padovan (pi->unacked_frames > 0)) 33780a708f8fSGustavo F. Padovan __mod_retrans_timer(); 33790a708f8fSGustavo F. Padovan 33800a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 33810a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SREJ_SENT) 33820a708f8fSGustavo F. Padovan l2cap_send_ack(pi); 33830a708f8fSGustavo F. Padovan else 33840a708f8fSGustavo F. Padovan l2cap_ertm_send(sk); 33850a708f8fSGustavo F. Padovan } 33860a708f8fSGustavo F. Padovan } 33870a708f8fSGustavo F. Padovan 33880a708f8fSGustavo F. Padovan static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) 33890a708f8fSGustavo F. Padovan { 33900a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 33910a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 33920a708f8fSGustavo F. Padovan 33930a708f8fSGustavo F. Padovan BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); 33940a708f8fSGustavo F. Padovan 33950a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 33960a708f8fSGustavo F. Padovan 33970a708f8fSGustavo F. Padovan pi->expected_ack_seq = tx_seq; 33980a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 33990a708f8fSGustavo F. Padovan 34000a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 34010a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_REJ_ACT) 34020a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REJ_ACT; 34030a708f8fSGustavo F. Padovan else 34040a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 34050a708f8fSGustavo F. Padovan } else { 34060a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 34070a708f8fSGustavo F. Padovan 34080a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_WAIT_F) 34090a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_REJ_ACT; 34100a708f8fSGustavo F. Padovan } 34110a708f8fSGustavo F. Padovan } 34120a708f8fSGustavo F. Padovan static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) 34130a708f8fSGustavo F. Padovan { 34140a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 34150a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 34160a708f8fSGustavo F. Padovan 34170a708f8fSGustavo F. Padovan BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); 34180a708f8fSGustavo F. Padovan 34190a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 34200a708f8fSGustavo F. Padovan 34210a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 34220a708f8fSGustavo F. Padovan pi->expected_ack_seq = tx_seq; 34230a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 34240a708f8fSGustavo F. Padovan 34250a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SEND_FBIT; 34260a708f8fSGustavo F. Padovan l2cap_retransmit_one_frame(sk, tx_seq); 34270a708f8fSGustavo F. Padovan 34280a708f8fSGustavo F. Padovan l2cap_ertm_send(sk); 34290a708f8fSGustavo F. Padovan 34300a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_WAIT_F) { 34310a708f8fSGustavo F. Padovan pi->srej_save_reqseq = tx_seq; 34320a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SREJ_ACT; 34330a708f8fSGustavo F. Padovan } 34340a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 34350a708f8fSGustavo F. Padovan if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && 34360a708f8fSGustavo F. Padovan pi->srej_save_reqseq == tx_seq) 34370a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; 34380a708f8fSGustavo F. Padovan else 34390a708f8fSGustavo F. Padovan l2cap_retransmit_one_frame(sk, tx_seq); 34400a708f8fSGustavo F. Padovan } else { 34410a708f8fSGustavo F. Padovan l2cap_retransmit_one_frame(sk, tx_seq); 34420a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_WAIT_F) { 34430a708f8fSGustavo F. Padovan pi->srej_save_reqseq = tx_seq; 34440a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SREJ_ACT; 34450a708f8fSGustavo F. Padovan } 34460a708f8fSGustavo F. Padovan } 34470a708f8fSGustavo F. Padovan } 34480a708f8fSGustavo F. Padovan 34490a708f8fSGustavo F. Padovan static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) 34500a708f8fSGustavo F. Padovan { 34510a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 34520a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 34530a708f8fSGustavo F. Padovan 34540a708f8fSGustavo F. Padovan BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); 34550a708f8fSGustavo F. Padovan 34560a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; 34570a708f8fSGustavo F. Padovan pi->expected_ack_seq = tx_seq; 34580a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 34590a708f8fSGustavo F. Padovan 34600a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 34610a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SEND_FBIT; 34620a708f8fSGustavo F. Padovan 34630a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { 34640a708f8fSGustavo F. Padovan del_timer(&pi->retrans_timer); 34650a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 34660a708f8fSGustavo F. Padovan l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); 34670a708f8fSGustavo F. Padovan return; 34680a708f8fSGustavo F. Padovan } 34690a708f8fSGustavo F. Padovan 34700a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 34710a708f8fSGustavo F. Padovan l2cap_send_srejtail(sk); 34720a708f8fSGustavo F. Padovan else 34730a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); 34740a708f8fSGustavo F. Padovan } 34750a708f8fSGustavo F. Padovan 34760a708f8fSGustavo F. Padovan static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) 34770a708f8fSGustavo F. Padovan { 34780a708f8fSGustavo F. Padovan BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); 34790a708f8fSGustavo F. Padovan 34800a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 34810a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { 34820a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->monitor_timer); 34830a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->unacked_frames > 0) 34840a708f8fSGustavo F. Padovan __mod_retrans_timer(); 34850a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; 34860a708f8fSGustavo F. Padovan } 34870a708f8fSGustavo F. Padovan 34880a708f8fSGustavo F. Padovan switch (rx_control & L2CAP_CTRL_SUPERVISE) { 34890a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_READY: 34900a708f8fSGustavo F. Padovan l2cap_data_channel_rrframe(sk, rx_control); 34910a708f8fSGustavo F. Padovan break; 34920a708f8fSGustavo F. Padovan 34930a708f8fSGustavo F. Padovan case L2CAP_SUPER_REJECT: 34940a708f8fSGustavo F. Padovan l2cap_data_channel_rejframe(sk, rx_control); 34950a708f8fSGustavo F. Padovan break; 34960a708f8fSGustavo F. Padovan 34970a708f8fSGustavo F. Padovan case L2CAP_SUPER_SELECT_REJECT: 34980a708f8fSGustavo F. Padovan l2cap_data_channel_srejframe(sk, rx_control); 34990a708f8fSGustavo F. Padovan break; 35000a708f8fSGustavo F. Padovan 35010a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_NOT_READY: 35020a708f8fSGustavo F. Padovan l2cap_data_channel_rnrframe(sk, rx_control); 35030a708f8fSGustavo F. Padovan break; 35040a708f8fSGustavo F. Padovan } 35050a708f8fSGustavo F. Padovan 35060a708f8fSGustavo F. Padovan kfree_skb(skb); 35070a708f8fSGustavo F. Padovan return 0; 35080a708f8fSGustavo F. Padovan } 35090a708f8fSGustavo F. Padovan 35100a708f8fSGustavo F. Padovan static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) 35110a708f8fSGustavo F. Padovan { 35120a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 35130a708f8fSGustavo F. Padovan u16 control; 35140a708f8fSGustavo F. Padovan u8 req_seq; 35150a708f8fSGustavo F. Padovan int len, next_tx_seq_offset, req_seq_offset; 35160a708f8fSGustavo F. Padovan 35170a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 35180a708f8fSGustavo F. Padovan skb_pull(skb, 2); 35190a708f8fSGustavo F. Padovan len = skb->len; 35200a708f8fSGustavo F. Padovan 35210a708f8fSGustavo F. Padovan /* 35220a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 35230a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 35240a708f8fSGustavo F. Padovan * procedures and ask retransmission. 35250a708f8fSGustavo F. Padovan */ 35260a708f8fSGustavo F. Padovan if (l2cap_check_fcs(pi, skb)) 35270a708f8fSGustavo F. Padovan goto drop; 35280a708f8fSGustavo F. Padovan 35290a708f8fSGustavo F. Padovan if (__is_sar_start(control) && __is_iframe(control)) 35300a708f8fSGustavo F. Padovan len -= 2; 35310a708f8fSGustavo F. Padovan 35320a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) 35330a708f8fSGustavo F. Padovan len -= 2; 35340a708f8fSGustavo F. Padovan 35350a708f8fSGustavo F. Padovan if (len > pi->mps) { 35360a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35370a708f8fSGustavo F. Padovan goto drop; 35380a708f8fSGustavo F. Padovan } 35390a708f8fSGustavo F. Padovan 35400a708f8fSGustavo F. Padovan req_seq = __get_reqseq(control); 35410a708f8fSGustavo F. Padovan req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; 35420a708f8fSGustavo F. Padovan if (req_seq_offset < 0) 35430a708f8fSGustavo F. Padovan req_seq_offset += 64; 35440a708f8fSGustavo F. Padovan 35450a708f8fSGustavo F. Padovan next_tx_seq_offset = 35460a708f8fSGustavo F. Padovan (pi->next_tx_seq - pi->expected_ack_seq) % 64; 35470a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 35480a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 35490a708f8fSGustavo F. Padovan 35500a708f8fSGustavo F. Padovan /* check for invalid req-seq */ 35510a708f8fSGustavo F. Padovan if (req_seq_offset > next_tx_seq_offset) { 35520a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35530a708f8fSGustavo F. Padovan goto drop; 35540a708f8fSGustavo F. Padovan } 35550a708f8fSGustavo F. Padovan 35560a708f8fSGustavo F. Padovan if (__is_iframe(control)) { 35570a708f8fSGustavo F. Padovan if (len < 0) { 35580a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35590a708f8fSGustavo F. Padovan goto drop; 35600a708f8fSGustavo F. Padovan } 35610a708f8fSGustavo F. Padovan 35620a708f8fSGustavo F. Padovan l2cap_data_channel_iframe(sk, control, skb); 35630a708f8fSGustavo F. Padovan } else { 35640a708f8fSGustavo F. Padovan if (len != 0) { 35650a708f8fSGustavo F. Padovan BT_ERR("%d", len); 35660a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35670a708f8fSGustavo F. Padovan goto drop; 35680a708f8fSGustavo F. Padovan } 35690a708f8fSGustavo F. Padovan 35700a708f8fSGustavo F. Padovan l2cap_data_channel_sframe(sk, control, skb); 35710a708f8fSGustavo F. Padovan } 35720a708f8fSGustavo F. Padovan 35730a708f8fSGustavo F. Padovan return 0; 35740a708f8fSGustavo F. Padovan 35750a708f8fSGustavo F. Padovan drop: 35760a708f8fSGustavo F. Padovan kfree_skb(skb); 35770a708f8fSGustavo F. Padovan return 0; 35780a708f8fSGustavo F. Padovan } 35790a708f8fSGustavo F. Padovan 35800a708f8fSGustavo F. Padovan static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) 35810a708f8fSGustavo F. Padovan { 358248454079SGustavo F. Padovan struct l2cap_chan *chan; 35830a708f8fSGustavo F. Padovan struct sock *sk; 35840a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi; 35850a708f8fSGustavo F. Padovan u16 control; 35860a708f8fSGustavo F. Padovan u8 tx_seq; 35870a708f8fSGustavo F. Padovan int len; 35880a708f8fSGustavo F. Padovan 3589baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 359048454079SGustavo F. Padovan if (!chan) { 35910a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 35920a708f8fSGustavo F. Padovan goto drop; 35930a708f8fSGustavo F. Padovan } 35940a708f8fSGustavo F. Padovan 359548454079SGustavo F. Padovan sk = chan->sk; 35960a708f8fSGustavo F. Padovan pi = l2cap_pi(sk); 35970a708f8fSGustavo F. Padovan 35980a708f8fSGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 35990a708f8fSGustavo F. Padovan 36000a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 36010a708f8fSGustavo F. Padovan goto drop; 36020a708f8fSGustavo F. Padovan 36030a708f8fSGustavo F. Padovan switch (pi->mode) { 36040a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 36050a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 36060a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 36070a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 36080a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 36090a708f8fSGustavo F. Padovan 36100a708f8fSGustavo F. Padovan if (pi->imtu < skb->len) 36110a708f8fSGustavo F. Padovan goto drop; 36120a708f8fSGustavo F. Padovan 36130a708f8fSGustavo F. Padovan if (!sock_queue_rcv_skb(sk, skb)) 36140a708f8fSGustavo F. Padovan goto done; 36150a708f8fSGustavo F. Padovan break; 36160a708f8fSGustavo F. Padovan 36170a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 36180a708f8fSGustavo F. Padovan if (!sock_owned_by_user(sk)) { 36190a708f8fSGustavo F. Padovan l2cap_ertm_data_rcv(sk, skb); 36200a708f8fSGustavo F. Padovan } else { 36210a708f8fSGustavo F. Padovan if (sk_add_backlog(sk, skb)) 36220a708f8fSGustavo F. Padovan goto drop; 36230a708f8fSGustavo F. Padovan } 36240a708f8fSGustavo F. Padovan 36250a708f8fSGustavo F. Padovan goto done; 36260a708f8fSGustavo F. Padovan 36270a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 36280a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 36290a708f8fSGustavo F. Padovan skb_pull(skb, 2); 36300a708f8fSGustavo F. Padovan len = skb->len; 36310a708f8fSGustavo F. Padovan 36320a708f8fSGustavo F. Padovan if (l2cap_check_fcs(pi, skb)) 36330a708f8fSGustavo F. Padovan goto drop; 36340a708f8fSGustavo F. Padovan 36350a708f8fSGustavo F. Padovan if (__is_sar_start(control)) 36360a708f8fSGustavo F. Padovan len -= 2; 36370a708f8fSGustavo F. Padovan 36380a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) 36390a708f8fSGustavo F. Padovan len -= 2; 36400a708f8fSGustavo F. Padovan 36410a708f8fSGustavo F. Padovan if (len > pi->mps || len < 0 || __is_sframe(control)) 36420a708f8fSGustavo F. Padovan goto drop; 36430a708f8fSGustavo F. Padovan 36440a708f8fSGustavo F. Padovan tx_seq = __get_txseq(control); 36450a708f8fSGustavo F. Padovan 36460a708f8fSGustavo F. Padovan if (pi->expected_tx_seq == tx_seq) 36470a708f8fSGustavo F. Padovan pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; 36480a708f8fSGustavo F. Padovan else 36490a708f8fSGustavo F. Padovan pi->expected_tx_seq = (tx_seq + 1) % 64; 36500a708f8fSGustavo F. Padovan 36510a708f8fSGustavo F. Padovan l2cap_streaming_reassembly_sdu(sk, skb, control); 36520a708f8fSGustavo F. Padovan 36530a708f8fSGustavo F. Padovan goto done; 36540a708f8fSGustavo F. Padovan 36550a708f8fSGustavo F. Padovan default: 36560a708f8fSGustavo F. Padovan BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); 36570a708f8fSGustavo F. Padovan break; 36580a708f8fSGustavo F. Padovan } 36590a708f8fSGustavo F. Padovan 36600a708f8fSGustavo F. Padovan drop: 36610a708f8fSGustavo F. Padovan kfree_skb(skb); 36620a708f8fSGustavo F. Padovan 36630a708f8fSGustavo F. Padovan done: 36640a708f8fSGustavo F. Padovan if (sk) 36650a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 36660a708f8fSGustavo F. Padovan 36670a708f8fSGustavo F. Padovan return 0; 36680a708f8fSGustavo F. Padovan } 36690a708f8fSGustavo F. Padovan 36700a708f8fSGustavo F. Padovan static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) 36710a708f8fSGustavo F. Padovan { 36720a708f8fSGustavo F. Padovan struct sock *sk; 36730a708f8fSGustavo F. Padovan 36740a708f8fSGustavo F. Padovan sk = l2cap_get_sock_by_psm(0, psm, conn->src); 36750a708f8fSGustavo F. Padovan if (!sk) 36760a708f8fSGustavo F. Padovan goto drop; 36770a708f8fSGustavo F. Padovan 36780a708f8fSGustavo F. Padovan bh_lock_sock(sk); 36790a708f8fSGustavo F. Padovan 36800a708f8fSGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 36810a708f8fSGustavo F. Padovan 36820a708f8fSGustavo F. Padovan if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) 36830a708f8fSGustavo F. Padovan goto drop; 36840a708f8fSGustavo F. Padovan 36850a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->imtu < skb->len) 36860a708f8fSGustavo F. Padovan goto drop; 36870a708f8fSGustavo F. Padovan 36880a708f8fSGustavo F. Padovan if (!sock_queue_rcv_skb(sk, skb)) 36890a708f8fSGustavo F. Padovan goto done; 36900a708f8fSGustavo F. Padovan 36910a708f8fSGustavo F. Padovan drop: 36920a708f8fSGustavo F. Padovan kfree_skb(skb); 36930a708f8fSGustavo F. Padovan 36940a708f8fSGustavo F. Padovan done: 36950a708f8fSGustavo F. Padovan if (sk) 36960a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 36970a708f8fSGustavo F. Padovan return 0; 36980a708f8fSGustavo F. Padovan } 36990a708f8fSGustavo F. Padovan 37000a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 37010a708f8fSGustavo F. Padovan { 37020a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 37030a708f8fSGustavo F. Padovan u16 cid, len; 37040a708f8fSGustavo F. Padovan __le16 psm; 37050a708f8fSGustavo F. Padovan 37060a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 37070a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 37080a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 37090a708f8fSGustavo F. Padovan 37100a708f8fSGustavo F. Padovan if (len != skb->len) { 37110a708f8fSGustavo F. Padovan kfree_skb(skb); 37120a708f8fSGustavo F. Padovan return; 37130a708f8fSGustavo F. Padovan } 37140a708f8fSGustavo F. Padovan 37150a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 37160a708f8fSGustavo F. Padovan 37170a708f8fSGustavo F. Padovan switch (cid) { 37183300d9a9SClaudio Takahasi case L2CAP_CID_LE_SIGNALING: 37190a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 37200a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 37210a708f8fSGustavo F. Padovan break; 37220a708f8fSGustavo F. Padovan 37230a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 37240a708f8fSGustavo F. Padovan psm = get_unaligned_le16(skb->data); 37250a708f8fSGustavo F. Padovan skb_pull(skb, 2); 37260a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 37270a708f8fSGustavo F. Padovan break; 37280a708f8fSGustavo F. Padovan 37290a708f8fSGustavo F. Padovan default: 37300a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 37310a708f8fSGustavo F. Padovan break; 37320a708f8fSGustavo F. Padovan } 37330a708f8fSGustavo F. Padovan } 37340a708f8fSGustavo F. Padovan 37350a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 37360a708f8fSGustavo F. Padovan 37370a708f8fSGustavo F. Padovan static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) 37380a708f8fSGustavo F. Padovan { 37390a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 37400a708f8fSGustavo F. Padovan register struct sock *sk; 37410a708f8fSGustavo F. Padovan struct hlist_node *node; 37420a708f8fSGustavo F. Padovan 37430a708f8fSGustavo F. Padovan if (type != ACL_LINK) 37440a708f8fSGustavo F. Padovan return -EINVAL; 37450a708f8fSGustavo F. Padovan 37460a708f8fSGustavo F. Padovan BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); 37470a708f8fSGustavo F. Padovan 37480a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 37490a708f8fSGustavo F. Padovan read_lock(&l2cap_sk_list.lock); 37500a708f8fSGustavo F. Padovan sk_for_each(sk, node, &l2cap_sk_list.head) { 37510a708f8fSGustavo F. Padovan if (sk->sk_state != BT_LISTEN) 37520a708f8fSGustavo F. Padovan continue; 37530a708f8fSGustavo F. Padovan 37540a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { 37550a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 37560a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->role_switch) 37570a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 37580a708f8fSGustavo F. Padovan exact++; 37590a708f8fSGustavo F. Padovan } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { 37600a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 37610a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->role_switch) 37620a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 37630a708f8fSGustavo F. Padovan } 37640a708f8fSGustavo F. Padovan } 37650a708f8fSGustavo F. Padovan read_unlock(&l2cap_sk_list.lock); 37660a708f8fSGustavo F. Padovan 37670a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 37680a708f8fSGustavo F. Padovan } 37690a708f8fSGustavo F. Padovan 37700a708f8fSGustavo F. Padovan static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 37710a708f8fSGustavo F. Padovan { 37720a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 37730a708f8fSGustavo F. Padovan 37740a708f8fSGustavo F. Padovan BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); 37750a708f8fSGustavo F. Padovan 3776acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 37770a708f8fSGustavo F. Padovan return -EINVAL; 37780a708f8fSGustavo F. Padovan 37790a708f8fSGustavo F. Padovan if (!status) { 37800a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, status); 37810a708f8fSGustavo F. Padovan if (conn) 37820a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 37830a708f8fSGustavo F. Padovan } else 37840a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(status)); 37850a708f8fSGustavo F. Padovan 37860a708f8fSGustavo F. Padovan return 0; 37870a708f8fSGustavo F. Padovan } 37880a708f8fSGustavo F. Padovan 37890a708f8fSGustavo F. Padovan static int l2cap_disconn_ind(struct hci_conn *hcon) 37900a708f8fSGustavo F. Padovan { 37910a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 37920a708f8fSGustavo F. Padovan 37930a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 37940a708f8fSGustavo F. Padovan 37950a708f8fSGustavo F. Padovan if (hcon->type != ACL_LINK || !conn) 37960a708f8fSGustavo F. Padovan return 0x13; 37970a708f8fSGustavo F. Padovan 37980a708f8fSGustavo F. Padovan return conn->disc_reason; 37990a708f8fSGustavo F. Padovan } 38000a708f8fSGustavo F. Padovan 38010a708f8fSGustavo F. Padovan static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 38020a708f8fSGustavo F. Padovan { 38030a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 38040a708f8fSGustavo F. Padovan 3805acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 38060a708f8fSGustavo F. Padovan return -EINVAL; 38070a708f8fSGustavo F. Padovan 38080a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(reason)); 38090a708f8fSGustavo F. Padovan 38100a708f8fSGustavo F. Padovan return 0; 38110a708f8fSGustavo F. Padovan } 38120a708f8fSGustavo F. Padovan 38130a708f8fSGustavo F. Padovan static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) 38140a708f8fSGustavo F. Padovan { 38150a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) 38160a708f8fSGustavo F. Padovan return; 38170a708f8fSGustavo F. Padovan 38180a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 38190a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { 38200a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 38210a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ * 5); 38220a708f8fSGustavo F. Padovan } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) 38230a708f8fSGustavo F. Padovan __l2cap_sock_close(sk, ECONNREFUSED); 38240a708f8fSGustavo F. Padovan } else { 38250a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) 38260a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 38270a708f8fSGustavo F. Padovan } 38280a708f8fSGustavo F. Padovan } 38290a708f8fSGustavo F. Padovan 38300a708f8fSGustavo F. Padovan static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 38310a708f8fSGustavo F. Padovan { 38320a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 383348454079SGustavo F. Padovan struct l2cap_chan *chan; 38340a708f8fSGustavo F. Padovan 38350a708f8fSGustavo F. Padovan if (!conn) 38360a708f8fSGustavo F. Padovan return 0; 38370a708f8fSGustavo F. Padovan 38380a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 38390a708f8fSGustavo F. Padovan 3840baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 38410a708f8fSGustavo F. Padovan 3842baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 384348454079SGustavo F. Padovan struct sock *sk = chan->sk; 3844baa7e1faSGustavo F. Padovan 38450a708f8fSGustavo F. Padovan bh_lock_sock(sk); 38460a708f8fSGustavo F. Padovan 38470a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { 38480a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 38490a708f8fSGustavo F. Padovan continue; 38500a708f8fSGustavo F. Padovan } 38510a708f8fSGustavo F. Padovan 38520a708f8fSGustavo F. Padovan if (!status && (sk->sk_state == BT_CONNECTED || 38530a708f8fSGustavo F. Padovan sk->sk_state == BT_CONFIG)) { 38540a708f8fSGustavo F. Padovan l2cap_check_encryption(sk, encrypt); 38550a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 38560a708f8fSGustavo F. Padovan continue; 38570a708f8fSGustavo F. Padovan } 38580a708f8fSGustavo F. Padovan 38590a708f8fSGustavo F. Padovan if (sk->sk_state == BT_CONNECT) { 38600a708f8fSGustavo F. Padovan if (!status) { 38610a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 38620a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 38630a708f8fSGustavo F. Padovan req.psm = l2cap_pi(sk)->psm; 38640a708f8fSGustavo F. Padovan 3865fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 38660a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 38670a708f8fSGustavo F. Padovan 3868fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 38690a708f8fSGustavo F. Padovan L2CAP_CONN_REQ, sizeof(req), &req); 38700a708f8fSGustavo F. Padovan } else { 38710a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 38720a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 10); 38730a708f8fSGustavo F. Padovan } 38740a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT2) { 38750a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 38760a708f8fSGustavo F. Padovan __u16 result; 38770a708f8fSGustavo F. Padovan 38780a708f8fSGustavo F. Padovan if (!status) { 38790a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 38800a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 38810a708f8fSGustavo F. Padovan } else { 38820a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 38830a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 10); 38840a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 38850a708f8fSGustavo F. Padovan } 38860a708f8fSGustavo F. Padovan 38870a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 38880a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 38890a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 38900a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 3891fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 3892fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 38930a708f8fSGustavo F. Padovan } 38940a708f8fSGustavo F. Padovan 38950a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 38960a708f8fSGustavo F. Padovan } 38970a708f8fSGustavo F. Padovan 3898baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 38990a708f8fSGustavo F. Padovan 39000a708f8fSGustavo F. Padovan return 0; 39010a708f8fSGustavo F. Padovan } 39020a708f8fSGustavo F. Padovan 39030a708f8fSGustavo F. Padovan static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 39040a708f8fSGustavo F. Padovan { 39050a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 39060a708f8fSGustavo F. Padovan 39070a708f8fSGustavo F. Padovan if (!conn) 39080a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 39090a708f8fSGustavo F. Padovan 39100a708f8fSGustavo F. Padovan if (!conn) 39110a708f8fSGustavo F. Padovan goto drop; 39120a708f8fSGustavo F. Padovan 39130a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 39140a708f8fSGustavo F. Padovan 39150a708f8fSGustavo F. Padovan if (!(flags & ACL_CONT)) { 39160a708f8fSGustavo F. Padovan struct l2cap_hdr *hdr; 391748454079SGustavo F. Padovan struct l2cap_chan *chan; 39180a708f8fSGustavo F. Padovan u16 cid; 39190a708f8fSGustavo F. Padovan int len; 39200a708f8fSGustavo F. Padovan 39210a708f8fSGustavo F. Padovan if (conn->rx_len) { 39220a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 39230a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 39240a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 39250a708f8fSGustavo F. Padovan conn->rx_len = 0; 39260a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39270a708f8fSGustavo F. Padovan } 39280a708f8fSGustavo F. Padovan 39290a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 39300a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 39310a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 39320a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39330a708f8fSGustavo F. Padovan goto drop; 39340a708f8fSGustavo F. Padovan } 39350a708f8fSGustavo F. Padovan 39360a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 39370a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 39380a708f8fSGustavo F. Padovan cid = __le16_to_cpu(hdr->cid); 39390a708f8fSGustavo F. Padovan 39400a708f8fSGustavo F. Padovan if (len == skb->len) { 39410a708f8fSGustavo F. Padovan /* Complete frame received */ 39420a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 39430a708f8fSGustavo F. Padovan return 0; 39440a708f8fSGustavo F. Padovan } 39450a708f8fSGustavo F. Padovan 39460a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 39470a708f8fSGustavo F. Padovan 39480a708f8fSGustavo F. Padovan if (skb->len > len) { 39490a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 39500a708f8fSGustavo F. Padovan skb->len, len); 39510a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39520a708f8fSGustavo F. Padovan goto drop; 39530a708f8fSGustavo F. Padovan } 39540a708f8fSGustavo F. Padovan 3955baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 39560a708f8fSGustavo F. Padovan 395748454079SGustavo F. Padovan if (chan && chan->sk) { 395848454079SGustavo F. Padovan struct sock *sk = chan->sk; 395948454079SGustavo F. Padovan 396048454079SGustavo F. Padovan if (l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { 396148454079SGustavo F. Padovan BT_ERR("Frame exceeding recv MTU (len %d, " 396248454079SGustavo F. Padovan "MTU %d)", len, 396348454079SGustavo F. Padovan l2cap_pi(sk)->imtu); 39640a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 39650a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39660a708f8fSGustavo F. Padovan goto drop; 39670a708f8fSGustavo F. Padovan } 39680a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 396948454079SGustavo F. Padovan } 39700a708f8fSGustavo F. Padovan 39710a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 39720a708f8fSGustavo F. Padovan conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); 39730a708f8fSGustavo F. Padovan if (!conn->rx_skb) 39740a708f8fSGustavo F. Padovan goto drop; 39750a708f8fSGustavo F. Padovan 39760a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 39770a708f8fSGustavo F. Padovan skb->len); 39780a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 39790a708f8fSGustavo F. Padovan } else { 39800a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 39810a708f8fSGustavo F. Padovan 39820a708f8fSGustavo F. Padovan if (!conn->rx_len) { 39830a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 39840a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39850a708f8fSGustavo F. Padovan goto drop; 39860a708f8fSGustavo F. Padovan } 39870a708f8fSGustavo F. Padovan 39880a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 39890a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 39900a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 39910a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 39920a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 39930a708f8fSGustavo F. Padovan conn->rx_len = 0; 39940a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39950a708f8fSGustavo F. Padovan goto drop; 39960a708f8fSGustavo F. Padovan } 39970a708f8fSGustavo F. Padovan 39980a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 39990a708f8fSGustavo F. Padovan skb->len); 40000a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 40010a708f8fSGustavo F. Padovan 40020a708f8fSGustavo F. Padovan if (!conn->rx_len) { 40030a708f8fSGustavo F. Padovan /* Complete frame received */ 40040a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, conn->rx_skb); 40050a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 40060a708f8fSGustavo F. Padovan } 40070a708f8fSGustavo F. Padovan } 40080a708f8fSGustavo F. Padovan 40090a708f8fSGustavo F. Padovan drop: 40100a708f8fSGustavo F. Padovan kfree_skb(skb); 40110a708f8fSGustavo F. Padovan return 0; 40120a708f8fSGustavo F. Padovan } 40130a708f8fSGustavo F. Padovan 40140a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 40150a708f8fSGustavo F. Padovan { 40160a708f8fSGustavo F. Padovan struct sock *sk; 40170a708f8fSGustavo F. Padovan struct hlist_node *node; 40180a708f8fSGustavo F. Padovan 40190a708f8fSGustavo F. Padovan read_lock_bh(&l2cap_sk_list.lock); 40200a708f8fSGustavo F. Padovan 40210a708f8fSGustavo F. Padovan sk_for_each(sk, node, &l2cap_sk_list.head) { 40220a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 40230a708f8fSGustavo F. Padovan 4024903d343eSGustavo F. Padovan seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 40250a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->src), 40260a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->dst), 40270a708f8fSGustavo F. Padovan sk->sk_state, __le16_to_cpu(pi->psm), 40280a708f8fSGustavo F. Padovan pi->scid, pi->dcid, 4029903d343eSGustavo F. Padovan pi->imtu, pi->omtu, pi->sec_level, 4030903d343eSGustavo F. Padovan pi->mode); 40310a708f8fSGustavo F. Padovan } 40320a708f8fSGustavo F. Padovan 40330a708f8fSGustavo F. Padovan read_unlock_bh(&l2cap_sk_list.lock); 40340a708f8fSGustavo F. Padovan 40350a708f8fSGustavo F. Padovan return 0; 40360a708f8fSGustavo F. Padovan } 40370a708f8fSGustavo F. Padovan 40380a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 40390a708f8fSGustavo F. Padovan { 40400a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 40410a708f8fSGustavo F. Padovan } 40420a708f8fSGustavo F. Padovan 40430a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 40440a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 40450a708f8fSGustavo F. Padovan .read = seq_read, 40460a708f8fSGustavo F. Padovan .llseek = seq_lseek, 40470a708f8fSGustavo F. Padovan .release = single_release, 40480a708f8fSGustavo F. Padovan }; 40490a708f8fSGustavo F. Padovan 40500a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 40510a708f8fSGustavo F. Padovan 40520a708f8fSGustavo F. Padovan static struct hci_proto l2cap_hci_proto = { 40530a708f8fSGustavo F. Padovan .name = "L2CAP", 40540a708f8fSGustavo F. Padovan .id = HCI_PROTO_L2CAP, 40550a708f8fSGustavo F. Padovan .connect_ind = l2cap_connect_ind, 40560a708f8fSGustavo F. Padovan .connect_cfm = l2cap_connect_cfm, 40570a708f8fSGustavo F. Padovan .disconn_ind = l2cap_disconn_ind, 40580a708f8fSGustavo F. Padovan .disconn_cfm = l2cap_disconn_cfm, 40590a708f8fSGustavo F. Padovan .security_cfm = l2cap_security_cfm, 40600a708f8fSGustavo F. Padovan .recv_acldata = l2cap_recv_acldata 40610a708f8fSGustavo F. Padovan }; 40620a708f8fSGustavo F. Padovan 406364274518SGustavo F. Padovan int __init l2cap_init(void) 40640a708f8fSGustavo F. Padovan { 40650a708f8fSGustavo F. Padovan int err; 40660a708f8fSGustavo F. Padovan 4067bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 40680a708f8fSGustavo F. Padovan if (err < 0) 40690a708f8fSGustavo F. Padovan return err; 40700a708f8fSGustavo F. Padovan 40710a708f8fSGustavo F. Padovan _busy_wq = create_singlethread_workqueue("l2cap"); 40720a708f8fSGustavo F. Padovan if (!_busy_wq) { 4073bb58f747SGustavo F. Padovan err = -ENOMEM; 40740a708f8fSGustavo F. Padovan goto error; 40750a708f8fSGustavo F. Padovan } 40760a708f8fSGustavo F. Padovan 40770a708f8fSGustavo F. Padovan err = hci_register_proto(&l2cap_hci_proto); 40780a708f8fSGustavo F. Padovan if (err < 0) { 40790a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol registration failed"); 40800a708f8fSGustavo F. Padovan bt_sock_unregister(BTPROTO_L2CAP); 40810a708f8fSGustavo F. Padovan goto error; 40820a708f8fSGustavo F. Padovan } 40830a708f8fSGustavo F. Padovan 40840a708f8fSGustavo F. Padovan if (bt_debugfs) { 40850a708f8fSGustavo F. Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, 40860a708f8fSGustavo F. Padovan bt_debugfs, NULL, &l2cap_debugfs_fops); 40870a708f8fSGustavo F. Padovan if (!l2cap_debugfs) 40880a708f8fSGustavo F. Padovan BT_ERR("Failed to create L2CAP debug file"); 40890a708f8fSGustavo F. Padovan } 40900a708f8fSGustavo F. Padovan 40910a708f8fSGustavo F. Padovan return 0; 40920a708f8fSGustavo F. Padovan 40930a708f8fSGustavo F. Padovan error: 40940a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 4095bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 40960a708f8fSGustavo F. Padovan return err; 40970a708f8fSGustavo F. Padovan } 40980a708f8fSGustavo F. Padovan 409964274518SGustavo F. Padovan void l2cap_exit(void) 41000a708f8fSGustavo F. Padovan { 41010a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 41020a708f8fSGustavo F. Padovan 41030a708f8fSGustavo F. Padovan flush_workqueue(_busy_wq); 41040a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 41050a708f8fSGustavo F. Padovan 41060a708f8fSGustavo F. Padovan if (hci_unregister_proto(&l2cap_hci_proto) < 0) 41070a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol unregistration failed"); 41080a708f8fSGustavo F. Padovan 4109bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 41100a708f8fSGustavo F. Padovan } 41110a708f8fSGustavo F. Padovan 41120a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 41130a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 4114