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); 73710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); 740a708f8fSGustavo F. Padovan 750a708f8fSGustavo F. Padovan static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); 760a708f8fSGustavo F. Padovan 770a708f8fSGustavo F. Padovan /* ---- L2CAP channels ---- */ 78baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) 790a708f8fSGustavo F. Padovan { 8048454079SGustavo F. Padovan struct l2cap_chan *c; 81baa7e1faSGustavo F. Padovan 82baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 83baa7e1faSGustavo F. Padovan struct sock *s = c->sk; 84baa7e1faSGustavo F. Padovan if (l2cap_pi(s)->dcid == cid) 8548454079SGustavo F. Padovan return c; 860a708f8fSGustavo F. Padovan } 87baa7e1faSGustavo F. Padovan return NULL; 88baa7e1faSGustavo F. Padovan 89baa7e1faSGustavo F. Padovan } 900a708f8fSGustavo F. Padovan 91baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) 920a708f8fSGustavo F. Padovan { 9348454079SGustavo F. Padovan struct l2cap_chan *c; 94baa7e1faSGustavo F. Padovan 95baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 96baa7e1faSGustavo F. Padovan struct sock *s = c->sk; 97baa7e1faSGustavo F. Padovan if (l2cap_pi(s)->scid == cid) 9848454079SGustavo F. Padovan return c; 990a708f8fSGustavo F. Padovan } 100baa7e1faSGustavo F. Padovan return NULL; 101baa7e1faSGustavo F. Padovan } 1020a708f8fSGustavo F. Padovan 1030a708f8fSGustavo F. Padovan /* Find channel with given SCID. 1040a708f8fSGustavo F. Padovan * Returns locked socket */ 105baa7e1faSGustavo F. Padovan static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) 1060a708f8fSGustavo F. Padovan { 10748454079SGustavo F. Padovan struct l2cap_chan *c; 108baa7e1faSGustavo F. Padovan 109baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 110baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_scid(conn, cid); 11148454079SGustavo F. Padovan if (c) 11248454079SGustavo F. Padovan bh_lock_sock(c->sk); 113baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 11448454079SGustavo F. Padovan return c; 1150a708f8fSGustavo F. Padovan } 1160a708f8fSGustavo F. Padovan 117baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) 1180a708f8fSGustavo F. Padovan { 11948454079SGustavo F. Padovan struct l2cap_chan *c; 120baa7e1faSGustavo F. Padovan 121baa7e1faSGustavo F. Padovan list_for_each_entry(c, &conn->chan_l, list) { 122fc7f8a7eSGustavo F. Padovan if (c->ident == ident) 12348454079SGustavo F. Padovan return c; 1240a708f8fSGustavo F. Padovan } 125baa7e1faSGustavo F. Padovan return NULL; 126baa7e1faSGustavo F. Padovan } 1270a708f8fSGustavo F. Padovan 128baa7e1faSGustavo F. Padovan static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) 1290a708f8fSGustavo F. Padovan { 13048454079SGustavo F. Padovan struct l2cap_chan *c; 131baa7e1faSGustavo F. Padovan 132baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 133baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_ident(conn, ident); 13448454079SGustavo F. Padovan if (c) 13548454079SGustavo F. Padovan bh_lock_sock(c->sk); 136baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 13748454079SGustavo F. Padovan return c; 1380a708f8fSGustavo F. Padovan } 1390a708f8fSGustavo F. Padovan 140baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 1410a708f8fSGustavo F. Padovan { 1420a708f8fSGustavo F. Padovan u16 cid = L2CAP_CID_DYN_START; 1430a708f8fSGustavo F. Padovan 1440a708f8fSGustavo F. Padovan for (; cid < L2CAP_CID_DYN_END; cid++) { 145baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 1460a708f8fSGustavo F. Padovan return cid; 1470a708f8fSGustavo F. Padovan } 1480a708f8fSGustavo F. Padovan 1490a708f8fSGustavo F. Padovan return 0; 1500a708f8fSGustavo F. Padovan } 1510a708f8fSGustavo F. Padovan 15248454079SGustavo F. Padovan static struct l2cap_chan *l2cap_chan_alloc(struct sock *sk) 1530a708f8fSGustavo F. Padovan { 15448454079SGustavo F. Padovan struct l2cap_chan *chan; 1550a708f8fSGustavo F. Padovan 15648454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 15748454079SGustavo F. Padovan if (!chan) 15848454079SGustavo F. Padovan return NULL; 1590a708f8fSGustavo F. Padovan 16048454079SGustavo F. Padovan chan->sk = sk; 16148454079SGustavo F. Padovan 16248454079SGustavo F. Padovan return chan; 1630a708f8fSGustavo F. Padovan } 1640a708f8fSGustavo F. Padovan 16548454079SGustavo F. Padovan static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 1660a708f8fSGustavo F. Padovan { 16748454079SGustavo F. Padovan struct sock *sk = chan->sk; 1680a708f8fSGustavo F. Padovan 1690a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 1700a708f8fSGustavo F. Padovan l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); 1710a708f8fSGustavo F. Padovan 1720a708f8fSGustavo F. Padovan conn->disc_reason = 0x13; 1730a708f8fSGustavo F. Padovan 1740a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn = conn; 1750a708f8fSGustavo F. Padovan 1760a708f8fSGustavo F. Padovan if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { 177b62f328bSVille Tervo if (conn->hcon->type == LE_LINK) { 178b62f328bSVille Tervo /* LE connection */ 179b62f328bSVille Tervo l2cap_pi(sk)->omtu = L2CAP_LE_DEFAULT_MTU; 180b62f328bSVille Tervo l2cap_pi(sk)->scid = L2CAP_CID_LE_DATA; 181b62f328bSVille Tervo l2cap_pi(sk)->dcid = L2CAP_CID_LE_DATA; 182b62f328bSVille Tervo } else { 1830a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 184baa7e1faSGustavo F. Padovan l2cap_pi(sk)->scid = l2cap_alloc_cid(conn); 185b62f328bSVille Tervo l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; 186b62f328bSVille Tervo } 1870a708f8fSGustavo F. Padovan } else if (sk->sk_type == SOCK_DGRAM) { 1880a708f8fSGustavo F. Padovan /* Connectionless socket */ 1890a708f8fSGustavo F. Padovan l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; 1900a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; 1910a708f8fSGustavo F. Padovan l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; 1920a708f8fSGustavo F. Padovan } else { 1930a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 1940a708f8fSGustavo F. Padovan l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; 1950a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; 1960a708f8fSGustavo F. Padovan l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; 1970a708f8fSGustavo F. Padovan } 1980a708f8fSGustavo F. Padovan 199baa7e1faSGustavo F. Padovan sock_hold(sk); 200baa7e1faSGustavo F. Padovan 201baa7e1faSGustavo F. Padovan list_add(&chan->list, &conn->chan_l); 2020a708f8fSGustavo F. Padovan } 2030a708f8fSGustavo F. Padovan 2040a708f8fSGustavo F. Padovan /* Delete channel. 2050a708f8fSGustavo F. Padovan * Must be called on the locked socket. */ 20648454079SGustavo F. Padovan void l2cap_chan_del(struct l2cap_chan *chan, int err) 2070a708f8fSGustavo F. Padovan { 20848454079SGustavo F. Padovan struct sock *sk = chan->sk; 2090a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 2100a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 2110a708f8fSGustavo F. Padovan 2120a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 2130a708f8fSGustavo F. Padovan 2140a708f8fSGustavo F. Padovan BT_DBG("sk %p, conn %p, err %d", sk, conn, err); 2150a708f8fSGustavo F. Padovan 2160a708f8fSGustavo F. Padovan if (conn) { 217baa7e1faSGustavo F. Padovan /* Delete from channel list */ 218baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 219baa7e1faSGustavo F. Padovan list_del(&chan->list); 220baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 221baa7e1faSGustavo F. Padovan __sock_put(sk); 222baa7e1faSGustavo F. Padovan 2230a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn = NULL; 2240a708f8fSGustavo F. Padovan hci_conn_put(conn->hcon); 2250a708f8fSGustavo F. Padovan } 2260a708f8fSGustavo F. Padovan 2270a708f8fSGustavo F. Padovan sk->sk_state = BT_CLOSED; 2280a708f8fSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 2290a708f8fSGustavo F. Padovan 2300a708f8fSGustavo F. Padovan if (err) 2310a708f8fSGustavo F. Padovan sk->sk_err = err; 2320a708f8fSGustavo F. Padovan 2330a708f8fSGustavo F. Padovan if (parent) { 2340a708f8fSGustavo F. Padovan bt_accept_unlink(sk); 2350a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 2360a708f8fSGustavo F. Padovan } else 2370a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 2380a708f8fSGustavo F. Padovan 2390a708f8fSGustavo F. Padovan skb_queue_purge(TX_QUEUE(sk)); 2400a708f8fSGustavo F. Padovan 2410a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { 2420a708f8fSGustavo F. Padovan struct srej_list *l, *tmp; 2430a708f8fSGustavo F. Padovan 2440a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->retrans_timer); 2450a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->monitor_timer); 2460a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->ack_timer); 2470a708f8fSGustavo F. Padovan 2480a708f8fSGustavo F. Padovan skb_queue_purge(SREJ_QUEUE(sk)); 2490a708f8fSGustavo F. Padovan skb_queue_purge(BUSY_QUEUE(sk)); 2500a708f8fSGustavo F. Padovan 2510a708f8fSGustavo F. Padovan list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { 2520a708f8fSGustavo F. Padovan list_del(&l->list); 2530a708f8fSGustavo F. Padovan kfree(l); 2540a708f8fSGustavo F. Padovan } 2550a708f8fSGustavo F. Padovan } 25648454079SGustavo F. Padovan 25748454079SGustavo F. Padovan kfree(chan); 2580a708f8fSGustavo F. Padovan } 2590a708f8fSGustavo F. Padovan 2600a708f8fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct sock *sk) 2610a708f8fSGustavo F. Padovan { 2620a708f8fSGustavo F. Padovan if (sk->sk_type == SOCK_RAW) { 2630a708f8fSGustavo F. Padovan switch (l2cap_pi(sk)->sec_level) { 2640a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 2650a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 2660a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 2670a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 2680a708f8fSGustavo F. Padovan default: 2690a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 2700a708f8fSGustavo F. Padovan } 2710a708f8fSGustavo F. Padovan } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { 2720a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) 2730a708f8fSGustavo F. Padovan l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; 2740a708f8fSGustavo F. Padovan 2750a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) 2760a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 2770a708f8fSGustavo F. Padovan else 2780a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 2790a708f8fSGustavo F. Padovan } else { 2800a708f8fSGustavo F. Padovan switch (l2cap_pi(sk)->sec_level) { 2810a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 2820a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 2830a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 2840a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 2850a708f8fSGustavo F. Padovan default: 2860a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 2870a708f8fSGustavo F. Padovan } 2880a708f8fSGustavo F. Padovan } 2890a708f8fSGustavo F. Padovan } 2900a708f8fSGustavo F. Padovan 2910a708f8fSGustavo F. Padovan /* Service level security */ 2920a708f8fSGustavo F. Padovan static inline int l2cap_check_security(struct sock *sk) 2930a708f8fSGustavo F. Padovan { 2940a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 2950a708f8fSGustavo F. Padovan __u8 auth_type; 2960a708f8fSGustavo F. Padovan 2970a708f8fSGustavo F. Padovan auth_type = l2cap_get_auth_type(sk); 2980a708f8fSGustavo F. Padovan 2990a708f8fSGustavo F. Padovan return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, 3000a708f8fSGustavo F. Padovan auth_type); 3010a708f8fSGustavo F. Padovan } 3020a708f8fSGustavo F. Padovan 30368983259SGustavo F. Padovan u8 l2cap_get_ident(struct l2cap_conn *conn) 3040a708f8fSGustavo F. Padovan { 3050a708f8fSGustavo F. Padovan u8 id; 3060a708f8fSGustavo F. Padovan 3070a708f8fSGustavo F. Padovan /* Get next available identificator. 3080a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 3090a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 3100a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 3110a708f8fSGustavo F. Padovan */ 3120a708f8fSGustavo F. Padovan 3130a708f8fSGustavo F. Padovan spin_lock_bh(&conn->lock); 3140a708f8fSGustavo F. Padovan 3150a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 3160a708f8fSGustavo F. Padovan conn->tx_ident = 1; 3170a708f8fSGustavo F. Padovan 3180a708f8fSGustavo F. Padovan id = conn->tx_ident; 3190a708f8fSGustavo F. Padovan 3200a708f8fSGustavo F. Padovan spin_unlock_bh(&conn->lock); 3210a708f8fSGustavo F. Padovan 3220a708f8fSGustavo F. Padovan return id; 3230a708f8fSGustavo F. Padovan } 3240a708f8fSGustavo F. Padovan 32568983259SGustavo F. Padovan void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) 3260a708f8fSGustavo F. Padovan { 3270a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 3280a708f8fSGustavo F. Padovan u8 flags; 3290a708f8fSGustavo F. Padovan 3300a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 3310a708f8fSGustavo F. Padovan 3320a708f8fSGustavo F. Padovan if (!skb) 3330a708f8fSGustavo F. Padovan return; 3340a708f8fSGustavo F. Padovan 3350a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 3360a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 3370a708f8fSGustavo F. Padovan else 3380a708f8fSGustavo F. Padovan flags = ACL_START; 3390a708f8fSGustavo F. Padovan 3400a708f8fSGustavo F. Padovan hci_send_acl(conn->hcon, skb, flags); 3410a708f8fSGustavo F. Padovan } 3420a708f8fSGustavo F. Padovan 343525cd185SGustavo F. Padovan static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) 3440a708f8fSGustavo F. Padovan { 3450a708f8fSGustavo F. Padovan struct sk_buff *skb; 3460a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 347525cd185SGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(chan->sk); 3480a708f8fSGustavo F. Padovan struct l2cap_conn *conn = pi->conn; 3490a708f8fSGustavo F. Padovan struct sock *sk = (struct sock *)pi; 3500a708f8fSGustavo F. Padovan int count, hlen = L2CAP_HDR_SIZE + 2; 3510a708f8fSGustavo F. Padovan u8 flags; 3520a708f8fSGustavo F. Padovan 3530a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 3540a708f8fSGustavo F. Padovan return; 3550a708f8fSGustavo F. Padovan 3560a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) 3570a708f8fSGustavo F. Padovan hlen += 2; 3580a708f8fSGustavo F. Padovan 3590a708f8fSGustavo F. Padovan BT_DBG("pi %p, control 0x%2.2x", pi, control); 3600a708f8fSGustavo F. Padovan 3610a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, hlen); 3620a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FRAME_TYPE; 3630a708f8fSGustavo F. Padovan 364525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { 3650a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 366525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; 3670a708f8fSGustavo F. Padovan } 3680a708f8fSGustavo F. Padovan 369525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_PBIT) { 3700a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_POLL; 371525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_PBIT; 3720a708f8fSGustavo F. Padovan } 3730a708f8fSGustavo F. Padovan 3740a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 3750a708f8fSGustavo F. Padovan if (!skb) 3760a708f8fSGustavo F. Padovan return; 3770a708f8fSGustavo F. Padovan 3780a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 3790a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 3800a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(pi->dcid); 3810a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 3820a708f8fSGustavo F. Padovan 3830a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 3840a708f8fSGustavo F. Padovan u16 fcs = crc16(0, (u8 *)lh, count - 2); 3850a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb_put(skb, 2)); 3860a708f8fSGustavo F. Padovan } 3870a708f8fSGustavo F. Padovan 3880a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 3890a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 3900a708f8fSGustavo F. Padovan else 3910a708f8fSGustavo F. Padovan flags = ACL_START; 3920a708f8fSGustavo F. Padovan 3930a708f8fSGustavo F. Padovan hci_send_acl(pi->conn->hcon, skb, flags); 3940a708f8fSGustavo F. Padovan } 3950a708f8fSGustavo F. Padovan 396525cd185SGustavo F. Padovan static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) 3970a708f8fSGustavo F. Padovan { 398525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 3990a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 400525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 4010a708f8fSGustavo F. Padovan } else 4020a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 4030a708f8fSGustavo F. Padovan 40442e5c802SGustavo F. Padovan control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 4050a708f8fSGustavo F. Padovan 406525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 4070a708f8fSGustavo F. Padovan } 4080a708f8fSGustavo F. Padovan 4090a708f8fSGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct sock *sk) 4100a708f8fSGustavo F. Padovan { 4110a708f8fSGustavo F. Padovan return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); 4120a708f8fSGustavo F. Padovan } 4130a708f8fSGustavo F. Padovan 414fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 4150a708f8fSGustavo F. Padovan { 416fc7f8a7eSGustavo F. Padovan struct sock *sk = chan->sk; 4170a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 4180a708f8fSGustavo F. Padovan 4190a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 4200a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 4210a708f8fSGustavo F. Padovan return; 4220a708f8fSGustavo F. Padovan 4230a708f8fSGustavo F. Padovan if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { 4240a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 4250a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 4260a708f8fSGustavo F. Padovan req.psm = l2cap_pi(sk)->psm; 4270a708f8fSGustavo F. Padovan 428fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 4290a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 4300a708f8fSGustavo F. Padovan 431fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 432fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 4330a708f8fSGustavo F. Padovan } 4340a708f8fSGustavo F. Padovan } else { 4350a708f8fSGustavo F. Padovan struct l2cap_info_req req; 4360a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 4370a708f8fSGustavo F. Padovan 4380a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 4390a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 4400a708f8fSGustavo F. Padovan 4410a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 4420a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 4430a708f8fSGustavo F. Padovan 4440a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 4450a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 4460a708f8fSGustavo F. Padovan } 4470a708f8fSGustavo F. Padovan } 4480a708f8fSGustavo F. Padovan 4490a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 4500a708f8fSGustavo F. Padovan { 4510a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 4520a708f8fSGustavo F. Padovan if (!disable_ertm) 4530a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 4540a708f8fSGustavo F. Padovan 4550a708f8fSGustavo F. Padovan switch (mode) { 4560a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 4570a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 4580a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 4590a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 4600a708f8fSGustavo F. Padovan default: 4610a708f8fSGustavo F. Padovan return 0x00; 4620a708f8fSGustavo F. Padovan } 4630a708f8fSGustavo F. Padovan } 4640a708f8fSGustavo F. Padovan 4656de0702bSGustavo F. Padovan void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) 4660a708f8fSGustavo F. Padovan { 4670a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 4680a708f8fSGustavo F. Padovan 4690a708f8fSGustavo F. Padovan if (!conn) 4700a708f8fSGustavo F. Padovan return; 4710a708f8fSGustavo F. Padovan 4720a708f8fSGustavo F. Padovan skb_queue_purge(TX_QUEUE(sk)); 4730a708f8fSGustavo F. Padovan 4740a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { 4750a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->retrans_timer); 4760a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->monitor_timer); 4770a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->ack_timer); 4780a708f8fSGustavo F. Padovan } 4790a708f8fSGustavo F. Padovan 4800a708f8fSGustavo F. Padovan req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); 4810a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 4820a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 4830a708f8fSGustavo F. Padovan L2CAP_DISCONN_REQ, sizeof(req), &req); 4840a708f8fSGustavo F. Padovan 4850a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 4860a708f8fSGustavo F. Padovan sk->sk_err = err; 4870a708f8fSGustavo F. Padovan } 4880a708f8fSGustavo F. Padovan 4890a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 4900a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 4910a708f8fSGustavo F. Padovan { 492820ffdb3SGustavo F. Padovan struct l2cap_chan *chan, *tmp; 4930a708f8fSGustavo F. Padovan 4940a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 4950a708f8fSGustavo F. Padovan 496baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 4970a708f8fSGustavo F. Padovan 498820ffdb3SGustavo F. Padovan list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 49948454079SGustavo F. Padovan struct sock *sk = chan->sk; 500baa7e1faSGustavo F. Padovan 5010a708f8fSGustavo F. Padovan bh_lock_sock(sk); 5020a708f8fSGustavo F. Padovan 5030a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && 5040a708f8fSGustavo F. Padovan sk->sk_type != SOCK_STREAM) { 5050a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5060a708f8fSGustavo F. Padovan continue; 5070a708f8fSGustavo F. Padovan } 5080a708f8fSGustavo F. Padovan 5090a708f8fSGustavo F. Padovan if (sk->sk_state == BT_CONNECT) { 5100a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 5110a708f8fSGustavo F. Padovan 5120a708f8fSGustavo F. Padovan if (!l2cap_check_security(sk) || 5130a708f8fSGustavo F. Padovan !__l2cap_no_conn_pending(sk)) { 5140a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5150a708f8fSGustavo F. Padovan continue; 5160a708f8fSGustavo F. Padovan } 5170a708f8fSGustavo F. Padovan 5180a708f8fSGustavo F. Padovan if (!l2cap_mode_supported(l2cap_pi(sk)->mode, 5190a708f8fSGustavo F. Padovan conn->feat_mask) 5200a708f8fSGustavo F. Padovan && l2cap_pi(sk)->conf_state & 5210a708f8fSGustavo F. Padovan L2CAP_CONF_STATE2_DEVICE) { 522820ffdb3SGustavo F. Padovan /* __l2cap_sock_close() calls list_del(chan) 523820ffdb3SGustavo F. Padovan * so release the lock */ 524820ffdb3SGustavo F. Padovan read_unlock_bh(&conn->chan_lock); 525820ffdb3SGustavo F. Padovan __l2cap_sock_close(sk, ECONNRESET); 526820ffdb3SGustavo F. Padovan read_lock_bh(&conn->chan_lock); 5270a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5280a708f8fSGustavo F. Padovan continue; 5290a708f8fSGustavo F. Padovan } 5300a708f8fSGustavo F. Padovan 5310a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 5320a708f8fSGustavo F. Padovan req.psm = l2cap_pi(sk)->psm; 5330a708f8fSGustavo F. Padovan 534fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 5350a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 5360a708f8fSGustavo F. Padovan 537fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 538fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 5390a708f8fSGustavo F. Padovan 5400a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT2) { 5410a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 5420a708f8fSGustavo F. Padovan char buf[128]; 5430a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 5440a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 5450a708f8fSGustavo F. Padovan 5460a708f8fSGustavo F. Padovan if (l2cap_check_security(sk)) { 5470a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 5480a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 5490a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 5500a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 5510a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 5520a708f8fSGustavo F. Padovan 5530a708f8fSGustavo F. Padovan } else { 5540a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 5550a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 5560a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 5570a708f8fSGustavo F. Padovan } 5580a708f8fSGustavo F. Padovan } else { 5590a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 5600a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 5610a708f8fSGustavo F. Padovan } 5620a708f8fSGustavo F. Padovan 563fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 564fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 5650a708f8fSGustavo F. Padovan 5660a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || 5670a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 5680a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5690a708f8fSGustavo F. Padovan continue; 5700a708f8fSGustavo F. Padovan } 5710a708f8fSGustavo F. Padovan 5720a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 5730a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 57473ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 57573ffa904SGustavo F. Padovan chan->num_conf_req++; 5760a708f8fSGustavo F. Padovan } 5770a708f8fSGustavo F. Padovan 5780a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5790a708f8fSGustavo F. Padovan } 5800a708f8fSGustavo F. Padovan 581baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 5820a708f8fSGustavo F. Padovan } 5830a708f8fSGustavo F. Padovan 584b62f328bSVille Tervo /* Find socket with cid and source bdaddr. 585b62f328bSVille Tervo * Returns closest match, locked. 586b62f328bSVille Tervo */ 587b62f328bSVille Tervo static struct sock *l2cap_get_sock_by_scid(int state, __le16 cid, bdaddr_t *src) 588b62f328bSVille Tervo { 589b62f328bSVille Tervo struct sock *s, *sk = NULL, *sk1 = NULL; 590b62f328bSVille Tervo struct hlist_node *node; 591b62f328bSVille Tervo 592b62f328bSVille Tervo read_lock(&l2cap_sk_list.lock); 593b62f328bSVille Tervo 594b62f328bSVille Tervo sk_for_each(sk, node, &l2cap_sk_list.head) { 595b62f328bSVille Tervo if (state && sk->sk_state != state) 596b62f328bSVille Tervo continue; 597b62f328bSVille Tervo 598b62f328bSVille Tervo if (l2cap_pi(sk)->scid == cid) { 599b62f328bSVille Tervo /* Exact match. */ 600b62f328bSVille Tervo if (!bacmp(&bt_sk(sk)->src, src)) 601b62f328bSVille Tervo break; 602b62f328bSVille Tervo 603b62f328bSVille Tervo /* Closest match */ 604b62f328bSVille Tervo if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 605b62f328bSVille Tervo sk1 = sk; 606b62f328bSVille Tervo } 607b62f328bSVille Tervo } 608b62f328bSVille Tervo s = node ? sk : sk1; 609b62f328bSVille Tervo if (s) 610b62f328bSVille Tervo bh_lock_sock(s); 611b62f328bSVille Tervo read_unlock(&l2cap_sk_list.lock); 612b62f328bSVille Tervo 613b62f328bSVille Tervo return s; 614b62f328bSVille Tervo } 615b62f328bSVille Tervo 616b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 617b62f328bSVille Tervo { 618b62f328bSVille Tervo struct sock *parent, *uninitialized_var(sk); 61948454079SGustavo F. Padovan struct l2cap_chan *chan; 620b62f328bSVille Tervo 621b62f328bSVille Tervo BT_DBG(""); 622b62f328bSVille Tervo 623b62f328bSVille Tervo /* Check if we have socket listening on cid */ 624b62f328bSVille Tervo parent = l2cap_get_sock_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, 625b62f328bSVille Tervo conn->src); 626b62f328bSVille Tervo if (!parent) 627b62f328bSVille Tervo return; 628b62f328bSVille Tervo 629b62f328bSVille Tervo /* Check for backlog size */ 630b62f328bSVille Tervo if (sk_acceptq_is_full(parent)) { 631b62f328bSVille Tervo BT_DBG("backlog full %d", parent->sk_ack_backlog); 632b62f328bSVille Tervo goto clean; 633b62f328bSVille Tervo } 634b62f328bSVille Tervo 635b62f328bSVille Tervo sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); 636b62f328bSVille Tervo if (!sk) 637b62f328bSVille Tervo goto clean; 638b62f328bSVille Tervo 63948454079SGustavo F. Padovan chan = l2cap_chan_alloc(sk); 64048454079SGustavo F. Padovan if (!chan) { 64148454079SGustavo F. Padovan l2cap_sock_kill(sk); 64248454079SGustavo F. Padovan goto clean; 64348454079SGustavo F. Padovan } 64448454079SGustavo F. Padovan 645baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 646b62f328bSVille Tervo 647b62f328bSVille Tervo hci_conn_hold(conn->hcon); 648b62f328bSVille Tervo 649b62f328bSVille Tervo l2cap_sock_init(sk, parent); 650baa7e1faSGustavo F. Padovan 651b62f328bSVille Tervo bacpy(&bt_sk(sk)->src, conn->src); 652b62f328bSVille Tervo bacpy(&bt_sk(sk)->dst, conn->dst); 653b62f328bSVille Tervo 654d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 655d1010240SGustavo F. Padovan 65648454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 65748454079SGustavo F. Padovan 65848454079SGustavo F. Padovan l2cap_pi(sk)->chan = chan; 659b62f328bSVille Tervo 660b62f328bSVille Tervo l2cap_sock_set_timer(sk, sk->sk_sndtimeo); 661b62f328bSVille Tervo 662b62f328bSVille Tervo sk->sk_state = BT_CONNECTED; 663b62f328bSVille Tervo parent->sk_data_ready(parent, 0); 664b62f328bSVille Tervo 665baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 666b62f328bSVille Tervo 667b62f328bSVille Tervo clean: 668b62f328bSVille Tervo bh_unlock_sock(parent); 669b62f328bSVille Tervo } 670b62f328bSVille Tervo 6710a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 6720a708f8fSGustavo F. Padovan { 67348454079SGustavo F. Padovan struct l2cap_chan *chan; 6740a708f8fSGustavo F. Padovan 6750a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 6760a708f8fSGustavo F. Padovan 677b62f328bSVille Tervo if (!conn->hcon->out && conn->hcon->type == LE_LINK) 678b62f328bSVille Tervo l2cap_le_conn_ready(conn); 679b62f328bSVille Tervo 680baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 6810a708f8fSGustavo F. Padovan 682baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 68348454079SGustavo F. Padovan struct sock *sk = chan->sk; 684baa7e1faSGustavo F. Padovan 6850a708f8fSGustavo F. Padovan bh_lock_sock(sk); 6860a708f8fSGustavo F. Padovan 687acd7d370SVille Tervo if (conn->hcon->type == LE_LINK) { 688acd7d370SVille Tervo l2cap_sock_clear_timer(sk); 689acd7d370SVille Tervo sk->sk_state = BT_CONNECTED; 690acd7d370SVille Tervo sk->sk_state_change(sk); 691acd7d370SVille Tervo } 692acd7d370SVille Tervo 6930a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && 6940a708f8fSGustavo F. Padovan sk->sk_type != SOCK_STREAM) { 6950a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 6960a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 6970a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 6980a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT) 699fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 7000a708f8fSGustavo F. Padovan 7010a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7020a708f8fSGustavo F. Padovan } 7030a708f8fSGustavo F. Padovan 704baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 7050a708f8fSGustavo F. Padovan } 7060a708f8fSGustavo F. Padovan 7070a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 7080a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 7090a708f8fSGustavo F. Padovan { 71048454079SGustavo F. Padovan struct l2cap_chan *chan; 7110a708f8fSGustavo F. Padovan 7120a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 7130a708f8fSGustavo F. Padovan 714baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 7150a708f8fSGustavo F. Padovan 716baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 71748454079SGustavo F. Padovan struct sock *sk = chan->sk; 718baa7e1faSGustavo F. Padovan 7190a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->force_reliable) 7200a708f8fSGustavo F. Padovan sk->sk_err = err; 7210a708f8fSGustavo F. Padovan } 7220a708f8fSGustavo F. Padovan 723baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 7240a708f8fSGustavo F. Padovan } 7250a708f8fSGustavo F. Padovan 7260a708f8fSGustavo F. Padovan static void l2cap_info_timeout(unsigned long arg) 7270a708f8fSGustavo F. Padovan { 7280a708f8fSGustavo F. Padovan struct l2cap_conn *conn = (void *) arg; 7290a708f8fSGustavo F. Padovan 7300a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 7310a708f8fSGustavo F. Padovan conn->info_ident = 0; 7320a708f8fSGustavo F. Padovan 7330a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 7340a708f8fSGustavo F. Padovan } 7350a708f8fSGustavo F. Padovan 7360a708f8fSGustavo F. Padovan static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) 7370a708f8fSGustavo F. Padovan { 7380a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 7390a708f8fSGustavo F. Padovan 7400a708f8fSGustavo F. Padovan if (conn || status) 7410a708f8fSGustavo F. Padovan return conn; 7420a708f8fSGustavo F. Padovan 7430a708f8fSGustavo F. Padovan conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); 7440a708f8fSGustavo F. Padovan if (!conn) 7450a708f8fSGustavo F. Padovan return NULL; 7460a708f8fSGustavo F. Padovan 7470a708f8fSGustavo F. Padovan hcon->l2cap_data = conn; 7480a708f8fSGustavo F. Padovan conn->hcon = hcon; 7490a708f8fSGustavo F. Padovan 7500a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p", hcon, conn); 7510a708f8fSGustavo F. Padovan 752acd7d370SVille Tervo if (hcon->hdev->le_mtu && hcon->type == LE_LINK) 753acd7d370SVille Tervo conn->mtu = hcon->hdev->le_mtu; 754acd7d370SVille Tervo else 7550a708f8fSGustavo F. Padovan conn->mtu = hcon->hdev->acl_mtu; 756acd7d370SVille Tervo 7570a708f8fSGustavo F. Padovan conn->src = &hcon->hdev->bdaddr; 7580a708f8fSGustavo F. Padovan conn->dst = &hcon->dst; 7590a708f8fSGustavo F. Padovan 7600a708f8fSGustavo F. Padovan conn->feat_mask = 0; 7610a708f8fSGustavo F. Padovan 7620a708f8fSGustavo F. Padovan spin_lock_init(&conn->lock); 763baa7e1faSGustavo F. Padovan rwlock_init(&conn->chan_lock); 764baa7e1faSGustavo F. Padovan 765baa7e1faSGustavo F. Padovan INIT_LIST_HEAD(&conn->chan_l); 7660a708f8fSGustavo F. Padovan 767b62f328bSVille Tervo if (hcon->type != LE_LINK) 7680a708f8fSGustavo F. Padovan setup_timer(&conn->info_timer, l2cap_info_timeout, 7690a708f8fSGustavo F. Padovan (unsigned long) conn); 7700a708f8fSGustavo F. Padovan 7710a708f8fSGustavo F. Padovan conn->disc_reason = 0x13; 7720a708f8fSGustavo F. Padovan 7730a708f8fSGustavo F. Padovan return conn; 7740a708f8fSGustavo F. Padovan } 7750a708f8fSGustavo F. Padovan 7760a708f8fSGustavo F. Padovan static void l2cap_conn_del(struct hci_conn *hcon, int err) 7770a708f8fSGustavo F. Padovan { 7780a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 779baa7e1faSGustavo F. Padovan struct l2cap_chan *chan, *l; 7800a708f8fSGustavo F. Padovan struct sock *sk; 7810a708f8fSGustavo F. Padovan 7820a708f8fSGustavo F. Padovan if (!conn) 7830a708f8fSGustavo F. Padovan return; 7840a708f8fSGustavo F. Padovan 7850a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 7860a708f8fSGustavo F. Padovan 7870a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 7880a708f8fSGustavo F. Padovan 7890a708f8fSGustavo F. Padovan /* Kill channels */ 790baa7e1faSGustavo F. Padovan list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 79148454079SGustavo F. Padovan sk = chan->sk; 7920a708f8fSGustavo F. Padovan bh_lock_sock(sk); 79348454079SGustavo F. Padovan l2cap_chan_del(chan, err); 7940a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7950a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 7960a708f8fSGustavo F. Padovan } 7970a708f8fSGustavo F. Padovan 7980a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 7990a708f8fSGustavo F. Padovan del_timer_sync(&conn->info_timer); 8000a708f8fSGustavo F. Padovan 8010a708f8fSGustavo F. Padovan hcon->l2cap_data = NULL; 8020a708f8fSGustavo F. Padovan kfree(conn); 8030a708f8fSGustavo F. Padovan } 8040a708f8fSGustavo F. Padovan 80548454079SGustavo F. Padovan static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 8060a708f8fSGustavo F. Padovan { 807baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 80848454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 809baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 8100a708f8fSGustavo F. Padovan } 8110a708f8fSGustavo F. Padovan 8120a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 8130a708f8fSGustavo F. Padovan 8140a708f8fSGustavo F. Padovan /* Find socket with psm and source bdaddr. 8150a708f8fSGustavo F. Padovan * Returns closest match. 8160a708f8fSGustavo F. Padovan */ 8170a708f8fSGustavo F. Padovan static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) 8180a708f8fSGustavo F. Padovan { 8190a708f8fSGustavo F. Padovan struct sock *sk = NULL, *sk1 = NULL; 8200a708f8fSGustavo F. Padovan struct hlist_node *node; 8210a708f8fSGustavo F. Padovan 8220a708f8fSGustavo F. Padovan read_lock(&l2cap_sk_list.lock); 8230a708f8fSGustavo F. Padovan 8240a708f8fSGustavo F. Padovan sk_for_each(sk, node, &l2cap_sk_list.head) { 8250a708f8fSGustavo F. Padovan if (state && sk->sk_state != state) 8260a708f8fSGustavo F. Padovan continue; 8270a708f8fSGustavo F. Padovan 8280a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->psm == psm) { 8290a708f8fSGustavo F. Padovan /* Exact match. */ 8300a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, src)) 8310a708f8fSGustavo F. Padovan break; 8320a708f8fSGustavo F. Padovan 8330a708f8fSGustavo F. Padovan /* Closest match */ 8340a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 8350a708f8fSGustavo F. Padovan sk1 = sk; 8360a708f8fSGustavo F. Padovan } 8370a708f8fSGustavo F. Padovan } 8380a708f8fSGustavo F. Padovan 8390a708f8fSGustavo F. Padovan read_unlock(&l2cap_sk_list.lock); 8400a708f8fSGustavo F. Padovan 8410a708f8fSGustavo F. Padovan return node ? sk : sk1; 8420a708f8fSGustavo F. Padovan } 8430a708f8fSGustavo F. Padovan 8444e34c50bSGustavo F. Padovan int l2cap_do_connect(struct sock *sk) 8450a708f8fSGustavo F. Padovan { 8460a708f8fSGustavo F. Padovan bdaddr_t *src = &bt_sk(sk)->src; 8470a708f8fSGustavo F. Padovan bdaddr_t *dst = &bt_sk(sk)->dst; 8480a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 84948454079SGustavo F. Padovan struct l2cap_chan *chan; 8500a708f8fSGustavo F. Padovan struct hci_conn *hcon; 8510a708f8fSGustavo F. Padovan struct hci_dev *hdev; 8520a708f8fSGustavo F. Padovan __u8 auth_type; 8530a708f8fSGustavo F. Padovan int err; 8540a708f8fSGustavo F. Padovan 8550a708f8fSGustavo F. Padovan BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), 8560a708f8fSGustavo F. Padovan l2cap_pi(sk)->psm); 8570a708f8fSGustavo F. Padovan 8580a708f8fSGustavo F. Padovan hdev = hci_get_route(dst, src); 8590a708f8fSGustavo F. Padovan if (!hdev) 8600a708f8fSGustavo F. Padovan return -EHOSTUNREACH; 8610a708f8fSGustavo F. Padovan 8620a708f8fSGustavo F. Padovan hci_dev_lock_bh(hdev); 8630a708f8fSGustavo F. Padovan 8640a708f8fSGustavo F. Padovan auth_type = l2cap_get_auth_type(sk); 8650a708f8fSGustavo F. Padovan 866acd7d370SVille Tervo if (l2cap_pi(sk)->dcid == L2CAP_CID_LE_DATA) 867acd7d370SVille Tervo hcon = hci_connect(hdev, LE_LINK, dst, 868acd7d370SVille Tervo l2cap_pi(sk)->sec_level, auth_type); 869acd7d370SVille Tervo else 8700a708f8fSGustavo F. Padovan hcon = hci_connect(hdev, ACL_LINK, dst, 8710a708f8fSGustavo F. Padovan l2cap_pi(sk)->sec_level, auth_type); 872acd7d370SVille Tervo 87330e76272SVille Tervo if (IS_ERR(hcon)) { 87430e76272SVille Tervo err = PTR_ERR(hcon); 8750a708f8fSGustavo F. Padovan goto done; 87630e76272SVille Tervo } 8770a708f8fSGustavo F. Padovan 8780a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 8790a708f8fSGustavo F. Padovan if (!conn) { 8800a708f8fSGustavo F. Padovan hci_conn_put(hcon); 88130e76272SVille Tervo err = -ENOMEM; 8820a708f8fSGustavo F. Padovan goto done; 8830a708f8fSGustavo F. Padovan } 8840a708f8fSGustavo F. Padovan 88548454079SGustavo F. Padovan chan = l2cap_chan_alloc(sk); 88648454079SGustavo F. Padovan if (!chan) { 88748454079SGustavo F. Padovan hci_conn_put(hcon); 88848454079SGustavo F. Padovan err = -ENOMEM; 88948454079SGustavo F. Padovan goto done; 89048454079SGustavo F. Padovan } 89148454079SGustavo F. Padovan 8920a708f8fSGustavo F. Padovan /* Update source addr of the socket */ 8930a708f8fSGustavo F. Padovan bacpy(src, conn->src); 8940a708f8fSGustavo F. Padovan 89548454079SGustavo F. Padovan l2cap_chan_add(conn, chan); 89648454079SGustavo F. Padovan 89748454079SGustavo F. Padovan l2cap_pi(sk)->chan = chan; 8980a708f8fSGustavo F. Padovan 8990a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT; 9000a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, sk->sk_sndtimeo); 9010a708f8fSGustavo F. Padovan 9020a708f8fSGustavo F. Padovan if (hcon->state == BT_CONNECTED) { 9030a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && 9040a708f8fSGustavo F. Padovan sk->sk_type != SOCK_STREAM) { 9050a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 9060a708f8fSGustavo F. Padovan if (l2cap_check_security(sk)) 9070a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 9080a708f8fSGustavo F. Padovan } else 909fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 9100a708f8fSGustavo F. Padovan } 9110a708f8fSGustavo F. Padovan 91230e76272SVille Tervo err = 0; 91330e76272SVille Tervo 9140a708f8fSGustavo F. Padovan done: 9150a708f8fSGustavo F. Padovan hci_dev_unlock_bh(hdev); 9160a708f8fSGustavo F. Padovan hci_dev_put(hdev); 9170a708f8fSGustavo F. Padovan return err; 9180a708f8fSGustavo F. Padovan } 9190a708f8fSGustavo F. Padovan 920dcba0dbaSGustavo F. Padovan int __l2cap_wait_ack(struct sock *sk) 9210a708f8fSGustavo F. Padovan { 9220a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 9230a708f8fSGustavo F. Padovan int err = 0; 9240a708f8fSGustavo F. Padovan int timeo = HZ/5; 9250a708f8fSGustavo F. Padovan 9260a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 927*6a026610SGustavo F. Padovan while ((l2cap_pi(sk)->chan->unacked_frames > 0 && l2cap_pi(sk)->conn)) { 9280a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 9290a708f8fSGustavo F. Padovan 9300a708f8fSGustavo F. Padovan if (!timeo) 9310a708f8fSGustavo F. Padovan timeo = HZ/5; 9320a708f8fSGustavo F. Padovan 9330a708f8fSGustavo F. Padovan if (signal_pending(current)) { 9340a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 9350a708f8fSGustavo F. Padovan break; 9360a708f8fSGustavo F. Padovan } 9370a708f8fSGustavo F. Padovan 9380a708f8fSGustavo F. Padovan release_sock(sk); 9390a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 9400a708f8fSGustavo F. Padovan lock_sock(sk); 9410a708f8fSGustavo F. Padovan 9420a708f8fSGustavo F. Padovan err = sock_error(sk); 9430a708f8fSGustavo F. Padovan if (err) 9440a708f8fSGustavo F. Padovan break; 9450a708f8fSGustavo F. Padovan } 9460a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 9470a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 9480a708f8fSGustavo F. Padovan return err; 9490a708f8fSGustavo F. Padovan } 9500a708f8fSGustavo F. Padovan 9510a708f8fSGustavo F. Padovan static void l2cap_monitor_timeout(unsigned long arg) 9520a708f8fSGustavo F. Padovan { 953525cd185SGustavo F. Padovan struct l2cap_chan *chan = (void *) arg; 954525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 9550a708f8fSGustavo F. Padovan 956525cd185SGustavo F. Padovan BT_DBG("chan %p", chan); 9570a708f8fSGustavo F. Padovan 9580a708f8fSGustavo F. Padovan bh_lock_sock(sk); 959*6a026610SGustavo F. Padovan if (chan->retry_count >= l2cap_pi(sk)->remote_max_tx) { 9600a708f8fSGustavo F. Padovan l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); 9610a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9620a708f8fSGustavo F. Padovan return; 9630a708f8fSGustavo F. Padovan } 9640a708f8fSGustavo F. Padovan 965*6a026610SGustavo F. Padovan chan->retry_count++; 9660a708f8fSGustavo F. Padovan __mod_monitor_timer(); 9670a708f8fSGustavo F. Padovan 968525cd185SGustavo F. Padovan l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); 9690a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9700a708f8fSGustavo F. Padovan } 9710a708f8fSGustavo F. Padovan 9720a708f8fSGustavo F. Padovan static void l2cap_retrans_timeout(unsigned long arg) 9730a708f8fSGustavo F. Padovan { 974525cd185SGustavo F. Padovan struct l2cap_chan *chan = (void *) arg; 975525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 9760a708f8fSGustavo F. Padovan 9770a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 9780a708f8fSGustavo F. Padovan 9790a708f8fSGustavo F. Padovan bh_lock_sock(sk); 980*6a026610SGustavo F. Padovan chan->retry_count = 1; 9810a708f8fSGustavo F. Padovan __mod_monitor_timer(); 9820a708f8fSGustavo F. Padovan 983525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_WAIT_F; 9840a708f8fSGustavo F. Padovan 985525cd185SGustavo F. Padovan l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); 9860a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9870a708f8fSGustavo F. Padovan } 9880a708f8fSGustavo F. Padovan 98942e5c802SGustavo F. Padovan static void l2cap_drop_acked_frames(struct l2cap_chan *chan) 9900a708f8fSGustavo F. Padovan { 99142e5c802SGustavo F. Padovan struct sock *sk = chan->sk; 9920a708f8fSGustavo F. Padovan struct sk_buff *skb; 9930a708f8fSGustavo F. Padovan 9940a708f8fSGustavo F. Padovan while ((skb = skb_peek(TX_QUEUE(sk))) && 995*6a026610SGustavo F. Padovan chan->unacked_frames) { 99642e5c802SGustavo F. Padovan if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) 9970a708f8fSGustavo F. Padovan break; 9980a708f8fSGustavo F. Padovan 9990a708f8fSGustavo F. Padovan skb = skb_dequeue(TX_QUEUE(sk)); 10000a708f8fSGustavo F. Padovan kfree_skb(skb); 10010a708f8fSGustavo F. Padovan 1002*6a026610SGustavo F. Padovan chan->unacked_frames--; 10030a708f8fSGustavo F. Padovan } 10040a708f8fSGustavo F. Padovan 1005*6a026610SGustavo F. Padovan if (!chan->unacked_frames) 10060a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->retrans_timer); 10070a708f8fSGustavo F. Padovan } 10080a708f8fSGustavo F. Padovan 1009fd83ccdbSGustavo F. Padovan void l2cap_do_send(struct sock *sk, struct sk_buff *skb) 10100a708f8fSGustavo F. Padovan { 10110a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10120a708f8fSGustavo F. Padovan struct hci_conn *hcon = pi->conn->hcon; 10130a708f8fSGustavo F. Padovan u16 flags; 10140a708f8fSGustavo F. Padovan 10150a708f8fSGustavo F. Padovan BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); 10160a708f8fSGustavo F. Padovan 10170a708f8fSGustavo F. Padovan if (!pi->flushable && lmp_no_flush_capable(hcon->hdev)) 10180a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 10190a708f8fSGustavo F. Padovan else 10200a708f8fSGustavo F. Padovan flags = ACL_START; 10210a708f8fSGustavo F. Padovan 10220a708f8fSGustavo F. Padovan hci_send_acl(hcon, skb, flags); 10230a708f8fSGustavo F. Padovan } 10240a708f8fSGustavo F. Padovan 102542e5c802SGustavo F. Padovan void l2cap_streaming_send(struct l2cap_chan *chan) 10260a708f8fSGustavo F. Padovan { 102742e5c802SGustavo F. Padovan struct sock *sk = chan->sk; 10280a708f8fSGustavo F. Padovan struct sk_buff *skb; 10290a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10300a708f8fSGustavo F. Padovan u16 control, fcs; 10310a708f8fSGustavo F. Padovan 10320a708f8fSGustavo F. Padovan while ((skb = skb_dequeue(TX_QUEUE(sk)))) { 10330a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); 103442e5c802SGustavo F. Padovan control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; 10350a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); 10360a708f8fSGustavo F. Padovan 10370a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 10380a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, skb->len - 2); 10390a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + skb->len - 2); 10400a708f8fSGustavo F. Padovan } 10410a708f8fSGustavo F. Padovan 10420a708f8fSGustavo F. Padovan l2cap_do_send(sk, skb); 10430a708f8fSGustavo F. Padovan 104442e5c802SGustavo F. Padovan chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; 10450a708f8fSGustavo F. Padovan } 10460a708f8fSGustavo F. Padovan } 10470a708f8fSGustavo F. Padovan 1048525cd185SGustavo F. Padovan static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) 10490a708f8fSGustavo F. Padovan { 1050525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 10510a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10520a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 10530a708f8fSGustavo F. Padovan u16 control, fcs; 10540a708f8fSGustavo F. Padovan 10550a708f8fSGustavo F. Padovan skb = skb_peek(TX_QUEUE(sk)); 10560a708f8fSGustavo F. Padovan if (!skb) 10570a708f8fSGustavo F. Padovan return; 10580a708f8fSGustavo F. Padovan 10590a708f8fSGustavo F. Padovan do { 10600a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq == tx_seq) 10610a708f8fSGustavo F. Padovan break; 10620a708f8fSGustavo F. Padovan 10630a708f8fSGustavo F. Padovan if (skb_queue_is_last(TX_QUEUE(sk), skb)) 10640a708f8fSGustavo F. Padovan return; 10650a708f8fSGustavo F. Padovan 10660a708f8fSGustavo F. Padovan } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); 10670a708f8fSGustavo F. Padovan 10680a708f8fSGustavo F. Padovan if (pi->remote_max_tx && 10690a708f8fSGustavo F. Padovan bt_cb(skb)->retries == pi->remote_max_tx) { 10700a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); 10710a708f8fSGustavo F. Padovan return; 10720a708f8fSGustavo F. Padovan } 10730a708f8fSGustavo F. Padovan 10740a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 10750a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 10760a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 10770a708f8fSGustavo F. Padovan 1078525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { 10790a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 1080525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; 10810a708f8fSGustavo F. Padovan } 10820a708f8fSGustavo F. Padovan 108342e5c802SGustavo F. Padovan control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 10840a708f8fSGustavo F. Padovan | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 10850a708f8fSGustavo F. Padovan 10860a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 10870a708f8fSGustavo F. Padovan 10880a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 10890a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); 10900a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); 10910a708f8fSGustavo F. Padovan } 10920a708f8fSGustavo F. Padovan 10930a708f8fSGustavo F. Padovan l2cap_do_send(sk, tx_skb); 10940a708f8fSGustavo F. Padovan } 10950a708f8fSGustavo F. Padovan 1096525cd185SGustavo F. Padovan int l2cap_ertm_send(struct l2cap_chan *chan) 10970a708f8fSGustavo F. Padovan { 10980a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 1099525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 11000a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 11010a708f8fSGustavo F. Padovan u16 control, fcs; 11020a708f8fSGustavo F. Padovan int nsent = 0; 11030a708f8fSGustavo F. Padovan 11040a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 11050a708f8fSGustavo F. Padovan return -ENOTCONN; 11060a708f8fSGustavo F. Padovan 110742e5c802SGustavo F. Padovan while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(chan))) { 11080a708f8fSGustavo F. Padovan 11090a708f8fSGustavo F. Padovan if (pi->remote_max_tx && 11100a708f8fSGustavo F. Padovan bt_cb(skb)->retries == pi->remote_max_tx) { 11110a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); 11120a708f8fSGustavo F. Padovan break; 11130a708f8fSGustavo F. Padovan } 11140a708f8fSGustavo F. Padovan 11150a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 11160a708f8fSGustavo F. Padovan 11170a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 11180a708f8fSGustavo F. Padovan 11190a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 11200a708f8fSGustavo F. Padovan control &= L2CAP_CTRL_SAR; 11210a708f8fSGustavo F. Padovan 1122525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { 11230a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 1124525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; 11250a708f8fSGustavo F. Padovan } 112642e5c802SGustavo F. Padovan control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 112742e5c802SGustavo F. Padovan | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 11280a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 11290a708f8fSGustavo F. Padovan 11300a708f8fSGustavo F. Padovan 11310a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 11320a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); 11330a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); 11340a708f8fSGustavo F. Padovan } 11350a708f8fSGustavo F. Padovan 11360a708f8fSGustavo F. Padovan l2cap_do_send(sk, tx_skb); 11370a708f8fSGustavo F. Padovan 11380a708f8fSGustavo F. Padovan __mod_retrans_timer(); 11390a708f8fSGustavo F. Padovan 114042e5c802SGustavo F. Padovan bt_cb(skb)->tx_seq = chan->next_tx_seq; 114142e5c802SGustavo F. Padovan chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; 11420a708f8fSGustavo F. Padovan 114323e9fde2SSuraj Sumangala if (bt_cb(skb)->retries == 1) 1144*6a026610SGustavo F. Padovan chan->unacked_frames++; 114523e9fde2SSuraj Sumangala 1146*6a026610SGustavo F. Padovan chan->frames_sent++; 11470a708f8fSGustavo F. Padovan 11480a708f8fSGustavo F. Padovan if (skb_queue_is_last(TX_QUEUE(sk), skb)) 11490a708f8fSGustavo F. Padovan sk->sk_send_head = NULL; 11500a708f8fSGustavo F. Padovan else 11510a708f8fSGustavo F. Padovan sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); 11520a708f8fSGustavo F. Padovan 11530a708f8fSGustavo F. Padovan nsent++; 11540a708f8fSGustavo F. Padovan } 11550a708f8fSGustavo F. Padovan 11560a708f8fSGustavo F. Padovan return nsent; 11570a708f8fSGustavo F. Padovan } 11580a708f8fSGustavo F. Padovan 1159525cd185SGustavo F. Padovan static int l2cap_retransmit_frames(struct l2cap_chan *chan) 11600a708f8fSGustavo F. Padovan { 1161525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 11620a708f8fSGustavo F. Padovan int ret; 11630a708f8fSGustavo F. Padovan 11640a708f8fSGustavo F. Padovan if (!skb_queue_empty(TX_QUEUE(sk))) 11650a708f8fSGustavo F. Padovan sk->sk_send_head = TX_QUEUE(sk)->next; 11660a708f8fSGustavo F. Padovan 116742e5c802SGustavo F. Padovan chan->next_tx_seq = chan->expected_ack_seq; 1168525cd185SGustavo F. Padovan ret = l2cap_ertm_send(chan); 11690a708f8fSGustavo F. Padovan return ret; 11700a708f8fSGustavo F. Padovan } 11710a708f8fSGustavo F. Padovan 1172525cd185SGustavo F. Padovan static void l2cap_send_ack(struct l2cap_chan *chan) 11730a708f8fSGustavo F. Padovan { 11740a708f8fSGustavo F. Padovan u16 control = 0; 11750a708f8fSGustavo F. Padovan 117642e5c802SGustavo F. Padovan control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 11770a708f8fSGustavo F. Padovan 1178525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 11790a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 1180525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 1181525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 11820a708f8fSGustavo F. Padovan return; 11830a708f8fSGustavo F. Padovan } 11840a708f8fSGustavo F. Padovan 1185525cd185SGustavo F. Padovan if (l2cap_ertm_send(chan) > 0) 11860a708f8fSGustavo F. Padovan return; 11870a708f8fSGustavo F. Padovan 11880a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 1189525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 11900a708f8fSGustavo F. Padovan } 11910a708f8fSGustavo F. Padovan 1192525cd185SGustavo F. Padovan static void l2cap_send_srejtail(struct l2cap_chan *chan) 11930a708f8fSGustavo F. Padovan { 11940a708f8fSGustavo F. Padovan struct srej_list *tail; 11950a708f8fSGustavo F. Padovan u16 control; 11960a708f8fSGustavo F. Padovan 11970a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 11980a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 11990a708f8fSGustavo F. Padovan 1200525cd185SGustavo F. Padovan tail = list_entry(SREJ_LIST(chan->sk)->prev, struct srej_list, list); 12010a708f8fSGustavo F. Padovan control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 12020a708f8fSGustavo F. Padovan 1203525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 12040a708f8fSGustavo F. Padovan } 12050a708f8fSGustavo F. Padovan 12060a708f8fSGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) 12070a708f8fSGustavo F. Padovan { 12080a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12090a708f8fSGustavo F. Padovan struct sk_buff **frag; 12100a708f8fSGustavo F. Padovan int err, sent = 0; 12110a708f8fSGustavo F. Padovan 12120a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) 12130a708f8fSGustavo F. Padovan return -EFAULT; 12140a708f8fSGustavo F. Padovan 12150a708f8fSGustavo F. Padovan sent += count; 12160a708f8fSGustavo F. Padovan len -= count; 12170a708f8fSGustavo F. Padovan 12180a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 12190a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 12200a708f8fSGustavo F. Padovan while (len) { 12210a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 12220a708f8fSGustavo F. Padovan 12230a708f8fSGustavo F. Padovan *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); 12240a708f8fSGustavo F. Padovan if (!*frag) 12250a708f8fSGustavo F. Padovan return err; 12260a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) 12270a708f8fSGustavo F. Padovan return -EFAULT; 12280a708f8fSGustavo F. Padovan 12290a708f8fSGustavo F. Padovan sent += count; 12300a708f8fSGustavo F. Padovan len -= count; 12310a708f8fSGustavo F. Padovan 12320a708f8fSGustavo F. Padovan frag = &(*frag)->next; 12330a708f8fSGustavo F. Padovan } 12340a708f8fSGustavo F. Padovan 12350a708f8fSGustavo F. Padovan return sent; 12360a708f8fSGustavo F. Padovan } 12370a708f8fSGustavo F. Padovan 1238fd83ccdbSGustavo F. Padovan struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) 12390a708f8fSGustavo F. Padovan { 12400a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12410a708f8fSGustavo F. Padovan struct sk_buff *skb; 12420a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 12430a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 12440a708f8fSGustavo F. Padovan 12450a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 12460a708f8fSGustavo F. Padovan 12470a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 12480a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 12490a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 12500a708f8fSGustavo F. Padovan if (!skb) 12510a708f8fSGustavo F. Padovan return ERR_PTR(err); 12520a708f8fSGustavo F. Padovan 12530a708f8fSGustavo F. Padovan /* Create L2CAP header */ 12540a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 12550a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); 12560a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 12570a708f8fSGustavo F. Padovan put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); 12580a708f8fSGustavo F. Padovan 12590a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 12600a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 12610a708f8fSGustavo F. Padovan kfree_skb(skb); 12620a708f8fSGustavo F. Padovan return ERR_PTR(err); 12630a708f8fSGustavo F. Padovan } 12640a708f8fSGustavo F. Padovan return skb; 12650a708f8fSGustavo F. Padovan } 12660a708f8fSGustavo F. Padovan 1267fd83ccdbSGustavo F. Padovan struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) 12680a708f8fSGustavo F. Padovan { 12690a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12700a708f8fSGustavo F. Padovan struct sk_buff *skb; 12710a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE; 12720a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 12730a708f8fSGustavo F. Padovan 12740a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 12750a708f8fSGustavo F. Padovan 12760a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 12770a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 12780a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 12790a708f8fSGustavo F. Padovan if (!skb) 12800a708f8fSGustavo F. Padovan return ERR_PTR(err); 12810a708f8fSGustavo F. Padovan 12820a708f8fSGustavo F. Padovan /* Create L2CAP header */ 12830a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 12840a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); 12850a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 12860a708f8fSGustavo F. Padovan 12870a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 12880a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 12890a708f8fSGustavo F. Padovan kfree_skb(skb); 12900a708f8fSGustavo F. Padovan return ERR_PTR(err); 12910a708f8fSGustavo F. Padovan } 12920a708f8fSGustavo F. Padovan return skb; 12930a708f8fSGustavo F. Padovan } 12940a708f8fSGustavo F. Padovan 1295fd83ccdbSGustavo F. Padovan struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) 12960a708f8fSGustavo F. Padovan { 12970a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12980a708f8fSGustavo F. Padovan struct sk_buff *skb; 12990a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 13000a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 13010a708f8fSGustavo F. Padovan 13020a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 13030a708f8fSGustavo F. Padovan 13040a708f8fSGustavo F. Padovan if (!conn) 13050a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 13060a708f8fSGustavo F. Padovan 13070a708f8fSGustavo F. Padovan if (sdulen) 13080a708f8fSGustavo F. Padovan hlen += 2; 13090a708f8fSGustavo F. Padovan 13100a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) 13110a708f8fSGustavo F. Padovan hlen += 2; 13120a708f8fSGustavo F. Padovan 13130a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 13140a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 13150a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 13160a708f8fSGustavo F. Padovan if (!skb) 13170a708f8fSGustavo F. Padovan return ERR_PTR(err); 13180a708f8fSGustavo F. Padovan 13190a708f8fSGustavo F. Padovan /* Create L2CAP header */ 13200a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 13210a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); 13220a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 13230a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 13240a708f8fSGustavo F. Padovan if (sdulen) 13250a708f8fSGustavo F. Padovan put_unaligned_le16(sdulen, skb_put(skb, 2)); 13260a708f8fSGustavo F. Padovan 13270a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 13280a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 13290a708f8fSGustavo F. Padovan kfree_skb(skb); 13300a708f8fSGustavo F. Padovan return ERR_PTR(err); 13310a708f8fSGustavo F. Padovan } 13320a708f8fSGustavo F. Padovan 13330a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) 13340a708f8fSGustavo F. Padovan put_unaligned_le16(0, skb_put(skb, 2)); 13350a708f8fSGustavo F. Padovan 13360a708f8fSGustavo F. Padovan bt_cb(skb)->retries = 0; 13370a708f8fSGustavo F. Padovan return skb; 13380a708f8fSGustavo F. Padovan } 13390a708f8fSGustavo F. Padovan 1340fd83ccdbSGustavo F. Padovan int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) 13410a708f8fSGustavo F. Padovan { 13420a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 13430a708f8fSGustavo F. Padovan struct sk_buff *skb; 13440a708f8fSGustavo F. Padovan struct sk_buff_head sar_queue; 13450a708f8fSGustavo F. Padovan u16 control; 13460a708f8fSGustavo F. Padovan size_t size = 0; 13470a708f8fSGustavo F. Padovan 13480a708f8fSGustavo F. Padovan skb_queue_head_init(&sar_queue); 13490a708f8fSGustavo F. Padovan control = L2CAP_SDU_START; 13500a708f8fSGustavo F. Padovan skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); 13510a708f8fSGustavo F. Padovan if (IS_ERR(skb)) 13520a708f8fSGustavo F. Padovan return PTR_ERR(skb); 13530a708f8fSGustavo F. Padovan 13540a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 13550a708f8fSGustavo F. Padovan len -= pi->remote_mps; 13560a708f8fSGustavo F. Padovan size += pi->remote_mps; 13570a708f8fSGustavo F. Padovan 13580a708f8fSGustavo F. Padovan while (len > 0) { 13590a708f8fSGustavo F. Padovan size_t buflen; 13600a708f8fSGustavo F. Padovan 13610a708f8fSGustavo F. Padovan if (len > pi->remote_mps) { 13620a708f8fSGustavo F. Padovan control = L2CAP_SDU_CONTINUE; 13630a708f8fSGustavo F. Padovan buflen = pi->remote_mps; 13640a708f8fSGustavo F. Padovan } else { 13650a708f8fSGustavo F. Padovan control = L2CAP_SDU_END; 13660a708f8fSGustavo F. Padovan buflen = len; 13670a708f8fSGustavo F. Padovan } 13680a708f8fSGustavo F. Padovan 13690a708f8fSGustavo F. Padovan skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); 13700a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 13710a708f8fSGustavo F. Padovan skb_queue_purge(&sar_queue); 13720a708f8fSGustavo F. Padovan return PTR_ERR(skb); 13730a708f8fSGustavo F. Padovan } 13740a708f8fSGustavo F. Padovan 13750a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 13760a708f8fSGustavo F. Padovan len -= buflen; 13770a708f8fSGustavo F. Padovan size += buflen; 13780a708f8fSGustavo F. Padovan } 13790a708f8fSGustavo F. Padovan skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); 13800a708f8fSGustavo F. Padovan if (sk->sk_send_head == NULL) 13810a708f8fSGustavo F. Padovan sk->sk_send_head = sar_queue.next; 13820a708f8fSGustavo F. Padovan 13830a708f8fSGustavo F. Padovan return size; 13840a708f8fSGustavo F. Padovan } 13850a708f8fSGustavo F. Padovan 13860a708f8fSGustavo F. Padovan static void l2cap_chan_ready(struct sock *sk) 13870a708f8fSGustavo F. Padovan { 13880a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 13890a708f8fSGustavo F. Padovan 13900a708f8fSGustavo F. Padovan BT_DBG("sk %p, parent %p", sk, parent); 13910a708f8fSGustavo F. Padovan 13920a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state = 0; 13930a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 13940a708f8fSGustavo F. Padovan 13950a708f8fSGustavo F. Padovan if (!parent) { 13960a708f8fSGustavo F. Padovan /* Outgoing channel. 13970a708f8fSGustavo F. Padovan * Wake up socket sleeping on connect. 13980a708f8fSGustavo F. Padovan */ 13990a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 14000a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 14010a708f8fSGustavo F. Padovan } else { 14020a708f8fSGustavo F. Padovan /* Incoming channel. 14030a708f8fSGustavo F. Padovan * Wake up socket sleeping on accept. 14040a708f8fSGustavo F. Padovan */ 14050a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 14060a708f8fSGustavo F. Padovan } 14070a708f8fSGustavo F. Padovan } 14080a708f8fSGustavo F. Padovan 14090a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 14100a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 14110a708f8fSGustavo F. Padovan { 14120a708f8fSGustavo F. Padovan struct sk_buff *nskb; 141348454079SGustavo F. Padovan struct l2cap_chan *chan; 14140a708f8fSGustavo F. Padovan 14150a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 14160a708f8fSGustavo F. Padovan 1417baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 1418baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 141948454079SGustavo F. Padovan struct sock *sk = chan->sk; 14200a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_RAW) 14210a708f8fSGustavo F. Padovan continue; 14220a708f8fSGustavo F. Padovan 14230a708f8fSGustavo F. Padovan /* Don't send frame to the socket it came from */ 14240a708f8fSGustavo F. Padovan if (skb->sk == sk) 14250a708f8fSGustavo F. Padovan continue; 14260a708f8fSGustavo F. Padovan nskb = skb_clone(skb, GFP_ATOMIC); 14270a708f8fSGustavo F. Padovan if (!nskb) 14280a708f8fSGustavo F. Padovan continue; 14290a708f8fSGustavo F. Padovan 14300a708f8fSGustavo F. Padovan if (sock_queue_rcv_skb(sk, nskb)) 14310a708f8fSGustavo F. Padovan kfree_skb(nskb); 14320a708f8fSGustavo F. Padovan } 1433baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 14340a708f8fSGustavo F. Padovan } 14350a708f8fSGustavo F. Padovan 14360a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 14370a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 14380a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data) 14390a708f8fSGustavo F. Padovan { 14400a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 14410a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 14420a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 14430a708f8fSGustavo F. Padovan int len, count; 14440a708f8fSGustavo F. Padovan 14450a708f8fSGustavo F. Padovan BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", 14460a708f8fSGustavo F. Padovan conn, code, ident, dlen); 14470a708f8fSGustavo F. Padovan 14480a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 14490a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 14500a708f8fSGustavo F. Padovan 14510a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 14520a708f8fSGustavo F. Padovan if (!skb) 14530a708f8fSGustavo F. Padovan return NULL; 14540a708f8fSGustavo F. Padovan 14550a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 14560a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 14573300d9a9SClaudio Takahasi 14583300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 14593300d9a9SClaudio Takahasi lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); 14603300d9a9SClaudio Takahasi else 14610a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); 14620a708f8fSGustavo F. Padovan 14630a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 14640a708f8fSGustavo F. Padovan cmd->code = code; 14650a708f8fSGustavo F. Padovan cmd->ident = ident; 14660a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 14670a708f8fSGustavo F. Padovan 14680a708f8fSGustavo F. Padovan if (dlen) { 14690a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 14700a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 14710a708f8fSGustavo F. Padovan data += count; 14720a708f8fSGustavo F. Padovan } 14730a708f8fSGustavo F. Padovan 14740a708f8fSGustavo F. Padovan len -= skb->len; 14750a708f8fSGustavo F. Padovan 14760a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 14770a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 14780a708f8fSGustavo F. Padovan while (len) { 14790a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 14800a708f8fSGustavo F. Padovan 14810a708f8fSGustavo F. Padovan *frag = bt_skb_alloc(count, GFP_ATOMIC); 14820a708f8fSGustavo F. Padovan if (!*frag) 14830a708f8fSGustavo F. Padovan goto fail; 14840a708f8fSGustavo F. Padovan 14850a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 14860a708f8fSGustavo F. Padovan 14870a708f8fSGustavo F. Padovan len -= count; 14880a708f8fSGustavo F. Padovan data += count; 14890a708f8fSGustavo F. Padovan 14900a708f8fSGustavo F. Padovan frag = &(*frag)->next; 14910a708f8fSGustavo F. Padovan } 14920a708f8fSGustavo F. Padovan 14930a708f8fSGustavo F. Padovan return skb; 14940a708f8fSGustavo F. Padovan 14950a708f8fSGustavo F. Padovan fail: 14960a708f8fSGustavo F. Padovan kfree_skb(skb); 14970a708f8fSGustavo F. Padovan return NULL; 14980a708f8fSGustavo F. Padovan } 14990a708f8fSGustavo F. Padovan 15000a708f8fSGustavo F. Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) 15010a708f8fSGustavo F. Padovan { 15020a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 15030a708f8fSGustavo F. Padovan int len; 15040a708f8fSGustavo F. Padovan 15050a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 15060a708f8fSGustavo F. Padovan *ptr += len; 15070a708f8fSGustavo F. Padovan 15080a708f8fSGustavo F. Padovan *type = opt->type; 15090a708f8fSGustavo F. Padovan *olen = opt->len; 15100a708f8fSGustavo F. Padovan 15110a708f8fSGustavo F. Padovan switch (opt->len) { 15120a708f8fSGustavo F. Padovan case 1: 15130a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 15140a708f8fSGustavo F. Padovan break; 15150a708f8fSGustavo F. Padovan 15160a708f8fSGustavo F. Padovan case 2: 15170a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 15180a708f8fSGustavo F. Padovan break; 15190a708f8fSGustavo F. Padovan 15200a708f8fSGustavo F. Padovan case 4: 15210a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 15220a708f8fSGustavo F. Padovan break; 15230a708f8fSGustavo F. Padovan 15240a708f8fSGustavo F. Padovan default: 15250a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 15260a708f8fSGustavo F. Padovan break; 15270a708f8fSGustavo F. Padovan } 15280a708f8fSGustavo F. Padovan 15290a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); 15300a708f8fSGustavo F. Padovan return len; 15310a708f8fSGustavo F. Padovan } 15320a708f8fSGustavo F. Padovan 15330a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 15340a708f8fSGustavo F. Padovan { 15350a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 15360a708f8fSGustavo F. Padovan 15370a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); 15380a708f8fSGustavo F. Padovan 15390a708f8fSGustavo F. Padovan opt->type = type; 15400a708f8fSGustavo F. Padovan opt->len = len; 15410a708f8fSGustavo F. Padovan 15420a708f8fSGustavo F. Padovan switch (len) { 15430a708f8fSGustavo F. Padovan case 1: 15440a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 15450a708f8fSGustavo F. Padovan break; 15460a708f8fSGustavo F. Padovan 15470a708f8fSGustavo F. Padovan case 2: 15480a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 15490a708f8fSGustavo F. Padovan break; 15500a708f8fSGustavo F. Padovan 15510a708f8fSGustavo F. Padovan case 4: 15520a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 15530a708f8fSGustavo F. Padovan break; 15540a708f8fSGustavo F. Padovan 15550a708f8fSGustavo F. Padovan default: 15560a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 15570a708f8fSGustavo F. Padovan break; 15580a708f8fSGustavo F. Padovan } 15590a708f8fSGustavo F. Padovan 15600a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 15610a708f8fSGustavo F. Padovan } 15620a708f8fSGustavo F. Padovan 15630a708f8fSGustavo F. Padovan static void l2cap_ack_timeout(unsigned long arg) 15640a708f8fSGustavo F. Padovan { 1565525cd185SGustavo F. Padovan struct l2cap_chan *chan = (void *) arg; 15660a708f8fSGustavo F. Padovan 1567525cd185SGustavo F. Padovan bh_lock_sock(chan->sk); 1568525cd185SGustavo F. Padovan l2cap_send_ack(chan); 1569525cd185SGustavo F. Padovan bh_unlock_sock(chan->sk); 15700a708f8fSGustavo F. Padovan } 15710a708f8fSGustavo F. Padovan 1572525cd185SGustavo F. Padovan static inline void l2cap_ertm_init(struct l2cap_chan *chan) 15730a708f8fSGustavo F. Padovan { 1574525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 1575525cd185SGustavo F. Padovan 157642e5c802SGustavo F. Padovan chan->expected_ack_seq = 0; 1577*6a026610SGustavo F. Padovan chan->unacked_frames = 0; 157842e5c802SGustavo F. Padovan chan->buffer_seq = 0; 1579*6a026610SGustavo F. Padovan chan->num_acked = 0; 1580*6a026610SGustavo F. Padovan chan->frames_sent = 0; 15810a708f8fSGustavo F. Padovan 15820a708f8fSGustavo F. Padovan setup_timer(&l2cap_pi(sk)->retrans_timer, 1583525cd185SGustavo F. Padovan l2cap_retrans_timeout, (unsigned long) chan); 15840a708f8fSGustavo F. Padovan setup_timer(&l2cap_pi(sk)->monitor_timer, 1585525cd185SGustavo F. Padovan l2cap_monitor_timeout, (unsigned long) chan); 15860a708f8fSGustavo F. Padovan setup_timer(&l2cap_pi(sk)->ack_timer, 1587525cd185SGustavo F. Padovan l2cap_ack_timeout, (unsigned long) chan); 15880a708f8fSGustavo F. Padovan 15890a708f8fSGustavo F. Padovan __skb_queue_head_init(SREJ_QUEUE(sk)); 15900a708f8fSGustavo F. Padovan __skb_queue_head_init(BUSY_QUEUE(sk)); 15910a708f8fSGustavo F. Padovan 15920a708f8fSGustavo F. Padovan INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); 15930a708f8fSGustavo F. Padovan 15940a708f8fSGustavo F. Padovan sk->sk_backlog_rcv = l2cap_ertm_data_rcv; 15950a708f8fSGustavo F. Padovan } 15960a708f8fSGustavo F. Padovan 15970a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 15980a708f8fSGustavo F. Padovan { 15990a708f8fSGustavo F. Padovan switch (mode) { 16000a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 16010a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 16020a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 16030a708f8fSGustavo F. Padovan return mode; 16040a708f8fSGustavo F. Padovan /* fall through */ 16050a708f8fSGustavo F. Padovan default: 16060a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 16070a708f8fSGustavo F. Padovan } 16080a708f8fSGustavo F. Padovan } 16090a708f8fSGustavo F. Padovan 1610710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 16110a708f8fSGustavo F. Padovan { 161273ffa904SGustavo F. Padovan struct sock *sk = chan->sk; 16130a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 16140a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 16150a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = pi->mode }; 16160a708f8fSGustavo F. Padovan void *ptr = req->data; 16170a708f8fSGustavo F. Padovan 16180a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 16190a708f8fSGustavo F. Padovan 162073ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 16210a708f8fSGustavo F. Padovan goto done; 16220a708f8fSGustavo F. Padovan 16230a708f8fSGustavo F. Padovan switch (pi->mode) { 16240a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 16250a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 16260a708f8fSGustavo F. Padovan if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) 16270a708f8fSGustavo F. Padovan break; 16280a708f8fSGustavo F. Padovan 16290a708f8fSGustavo F. Padovan /* fall through */ 16300a708f8fSGustavo F. Padovan default: 16310a708f8fSGustavo F. Padovan pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); 16320a708f8fSGustavo F. Padovan break; 16330a708f8fSGustavo F. Padovan } 16340a708f8fSGustavo F. Padovan 16350a708f8fSGustavo F. Padovan done: 16360a708f8fSGustavo F. Padovan if (pi->imtu != L2CAP_DEFAULT_MTU) 16370a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); 16380a708f8fSGustavo F. Padovan 16390a708f8fSGustavo F. Padovan switch (pi->mode) { 16400a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 16410a708f8fSGustavo F. Padovan if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && 16420a708f8fSGustavo F. Padovan !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) 16430a708f8fSGustavo F. Padovan break; 16440a708f8fSGustavo F. Padovan 16450a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 16460a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 16470a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 16480a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 16490a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 16500a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 16510a708f8fSGustavo F. Padovan 16520a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 16530a708f8fSGustavo F. Padovan (unsigned long) &rfc); 16540a708f8fSGustavo F. Padovan break; 16550a708f8fSGustavo F. Padovan 16560a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 16570a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 16580a708f8fSGustavo F. Padovan rfc.txwin_size = pi->tx_win; 16590a708f8fSGustavo F. Padovan rfc.max_transmit = pi->max_tx; 16600a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 16610a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 16620a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 16630a708f8fSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) 16640a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 16650a708f8fSGustavo F. Padovan 16660a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 16670a708f8fSGustavo F. Padovan (unsigned long) &rfc); 16680a708f8fSGustavo F. Padovan 16690a708f8fSGustavo F. Padovan if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) 16700a708f8fSGustavo F. Padovan break; 16710a708f8fSGustavo F. Padovan 16720a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_NONE || 16730a708f8fSGustavo F. Padovan pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { 16740a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 16750a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); 16760a708f8fSGustavo F. Padovan } 16770a708f8fSGustavo F. Padovan break; 16780a708f8fSGustavo F. Padovan 16790a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 16800a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 16810a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 16820a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 16830a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 16840a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 16850a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 16860a708f8fSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) 16870a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 16880a708f8fSGustavo F. Padovan 16890a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 16900a708f8fSGustavo F. Padovan (unsigned long) &rfc); 16910a708f8fSGustavo F. Padovan 16920a708f8fSGustavo F. Padovan if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) 16930a708f8fSGustavo F. Padovan break; 16940a708f8fSGustavo F. Padovan 16950a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_NONE || 16960a708f8fSGustavo F. Padovan pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { 16970a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 16980a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); 16990a708f8fSGustavo F. Padovan } 17000a708f8fSGustavo F. Padovan break; 17010a708f8fSGustavo F. Padovan } 17020a708f8fSGustavo F. Padovan 17030a708f8fSGustavo F. Padovan req->dcid = cpu_to_le16(pi->dcid); 17040a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0); 17050a708f8fSGustavo F. Padovan 17060a708f8fSGustavo F. Padovan return ptr - data; 17070a708f8fSGustavo F. Padovan } 17080a708f8fSGustavo F. Padovan 170973ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 17100a708f8fSGustavo F. Padovan { 171173ffa904SGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(chan->sk); 17120a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 17130a708f8fSGustavo F. Padovan void *ptr = rsp->data; 171473ffa904SGustavo F. Padovan void *req = chan->conf_req; 171573ffa904SGustavo F. Padovan int len = chan->conf_len; 17160a708f8fSGustavo F. Padovan int type, hint, olen; 17170a708f8fSGustavo F. Padovan unsigned long val; 17180a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 17190a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 17200a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 17210a708f8fSGustavo F. Padovan 172273ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 17230a708f8fSGustavo F. Padovan 17240a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 17250a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 17260a708f8fSGustavo F. Padovan 17270a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 17280a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 17290a708f8fSGustavo F. Padovan 17300a708f8fSGustavo F. Padovan switch (type) { 17310a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 17320a708f8fSGustavo F. Padovan mtu = val; 17330a708f8fSGustavo F. Padovan break; 17340a708f8fSGustavo F. Padovan 17350a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 17360a708f8fSGustavo F. Padovan pi->flush_to = val; 17370a708f8fSGustavo F. Padovan break; 17380a708f8fSGustavo F. Padovan 17390a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 17400a708f8fSGustavo F. Padovan break; 17410a708f8fSGustavo F. Padovan 17420a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 17430a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 17440a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 17450a708f8fSGustavo F. Padovan break; 17460a708f8fSGustavo F. Padovan 17470a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 17480a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 17490a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; 17500a708f8fSGustavo F. Padovan 17510a708f8fSGustavo F. Padovan break; 17520a708f8fSGustavo F. Padovan 17530a708f8fSGustavo F. Padovan default: 17540a708f8fSGustavo F. Padovan if (hint) 17550a708f8fSGustavo F. Padovan break; 17560a708f8fSGustavo F. Padovan 17570a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 17580a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 17590a708f8fSGustavo F. Padovan break; 17600a708f8fSGustavo F. Padovan } 17610a708f8fSGustavo F. Padovan } 17620a708f8fSGustavo F. Padovan 176373ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 17640a708f8fSGustavo F. Padovan goto done; 17650a708f8fSGustavo F. Padovan 17660a708f8fSGustavo F. Padovan switch (pi->mode) { 17670a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 17680a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 17690a708f8fSGustavo F. Padovan if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { 17700a708f8fSGustavo F. Padovan pi->mode = l2cap_select_mode(rfc.mode, 17710a708f8fSGustavo F. Padovan pi->conn->feat_mask); 17720a708f8fSGustavo F. Padovan break; 17730a708f8fSGustavo F. Padovan } 17740a708f8fSGustavo F. Padovan 17750a708f8fSGustavo F. Padovan if (pi->mode != rfc.mode) 17760a708f8fSGustavo F. Padovan return -ECONNREFUSED; 17770a708f8fSGustavo F. Padovan 17780a708f8fSGustavo F. Padovan break; 17790a708f8fSGustavo F. Padovan } 17800a708f8fSGustavo F. Padovan 17810a708f8fSGustavo F. Padovan done: 17820a708f8fSGustavo F. Padovan if (pi->mode != rfc.mode) { 17830a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 17840a708f8fSGustavo F. Padovan rfc.mode = pi->mode; 17850a708f8fSGustavo F. Padovan 178673ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 17870a708f8fSGustavo F. Padovan return -ECONNREFUSED; 17880a708f8fSGustavo F. Padovan 17890a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 17900a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 17910a708f8fSGustavo F. Padovan } 17920a708f8fSGustavo F. Padovan 17930a708f8fSGustavo F. Padovan 17940a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 17950a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 17960a708f8fSGustavo F. Padovan * which ones we don't like. */ 17970a708f8fSGustavo F. Padovan 17980a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 17990a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 18000a708f8fSGustavo F. Padovan else { 18010a708f8fSGustavo F. Padovan pi->omtu = mtu; 18020a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MTU_DONE; 18030a708f8fSGustavo F. Padovan } 18040a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); 18050a708f8fSGustavo F. Padovan 18060a708f8fSGustavo F. Padovan switch (rfc.mode) { 18070a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 18080a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 18090a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MODE_DONE; 18100a708f8fSGustavo F. Padovan break; 18110a708f8fSGustavo F. Padovan 18120a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 18130a708f8fSGustavo F. Padovan pi->remote_tx_win = rfc.txwin_size; 18140a708f8fSGustavo F. Padovan pi->remote_max_tx = rfc.max_transmit; 18150a708f8fSGustavo F. Padovan 18160a708f8fSGustavo F. Padovan if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) 18170a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 18180a708f8fSGustavo F. Padovan 18190a708f8fSGustavo F. Padovan pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); 18200a708f8fSGustavo F. Padovan 18210a708f8fSGustavo F. Padovan rfc.retrans_timeout = 18220a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); 18230a708f8fSGustavo F. Padovan rfc.monitor_timeout = 18240a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); 18250a708f8fSGustavo F. Padovan 18260a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MODE_DONE; 18270a708f8fSGustavo F. Padovan 18280a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 18290a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 18300a708f8fSGustavo F. Padovan 18310a708f8fSGustavo F. Padovan break; 18320a708f8fSGustavo F. Padovan 18330a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 18340a708f8fSGustavo F. Padovan if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) 18350a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 18360a708f8fSGustavo F. Padovan 18370a708f8fSGustavo F. Padovan pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); 18380a708f8fSGustavo F. Padovan 18390a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MODE_DONE; 18400a708f8fSGustavo F. Padovan 18410a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 18420a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 18430a708f8fSGustavo F. Padovan 18440a708f8fSGustavo F. Padovan break; 18450a708f8fSGustavo F. Padovan 18460a708f8fSGustavo F. Padovan default: 18470a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 18480a708f8fSGustavo F. Padovan 18490a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 18500a708f8fSGustavo F. Padovan rfc.mode = pi->mode; 18510a708f8fSGustavo F. Padovan } 18520a708f8fSGustavo F. Padovan 18530a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 18540a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; 18550a708f8fSGustavo F. Padovan } 18560a708f8fSGustavo F. Padovan rsp->scid = cpu_to_le16(pi->dcid); 18570a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 18580a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(0x0000); 18590a708f8fSGustavo F. Padovan 18600a708f8fSGustavo F. Padovan return ptr - data; 18610a708f8fSGustavo F. Padovan } 18620a708f8fSGustavo F. Padovan 18630a708f8fSGustavo F. Padovan static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) 18640a708f8fSGustavo F. Padovan { 18650a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 18660a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 18670a708f8fSGustavo F. Padovan void *ptr = req->data; 18680a708f8fSGustavo F. Padovan int type, olen; 18690a708f8fSGustavo F. Padovan unsigned long val; 18700a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 18710a708f8fSGustavo F. Padovan 18720a708f8fSGustavo F. Padovan BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); 18730a708f8fSGustavo F. Padovan 18740a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 18750a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 18760a708f8fSGustavo F. Padovan 18770a708f8fSGustavo F. Padovan switch (type) { 18780a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 18790a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 18800a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 18810a708f8fSGustavo F. Padovan pi->imtu = L2CAP_DEFAULT_MIN_MTU; 18820a708f8fSGustavo F. Padovan } else 18830a708f8fSGustavo F. Padovan pi->imtu = val; 18840a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); 18850a708f8fSGustavo F. Padovan break; 18860a708f8fSGustavo F. Padovan 18870a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 18880a708f8fSGustavo F. Padovan pi->flush_to = val; 18890a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 18900a708f8fSGustavo F. Padovan 2, pi->flush_to); 18910a708f8fSGustavo F. Padovan break; 18920a708f8fSGustavo F. Padovan 18930a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 18940a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 18950a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 18960a708f8fSGustavo F. Padovan 18970a708f8fSGustavo F. Padovan if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && 18980a708f8fSGustavo F. Padovan rfc.mode != pi->mode) 18990a708f8fSGustavo F. Padovan return -ECONNREFUSED; 19000a708f8fSGustavo F. Padovan 19010a708f8fSGustavo F. Padovan pi->fcs = 0; 19020a708f8fSGustavo F. Padovan 19030a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 19040a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 19050a708f8fSGustavo F. Padovan break; 19060a708f8fSGustavo F. Padovan } 19070a708f8fSGustavo F. Padovan } 19080a708f8fSGustavo F. Padovan 19090a708f8fSGustavo F. Padovan if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) 19100a708f8fSGustavo F. Padovan return -ECONNREFUSED; 19110a708f8fSGustavo F. Padovan 19120a708f8fSGustavo F. Padovan pi->mode = rfc.mode; 19130a708f8fSGustavo F. Padovan 19140a708f8fSGustavo F. Padovan if (*result == L2CAP_CONF_SUCCESS) { 19150a708f8fSGustavo F. Padovan switch (rfc.mode) { 19160a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 19170a708f8fSGustavo F. Padovan pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 19180a708f8fSGustavo F. Padovan pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 19190a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19200a708f8fSGustavo F. Padovan break; 19210a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 19220a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19230a708f8fSGustavo F. Padovan } 19240a708f8fSGustavo F. Padovan } 19250a708f8fSGustavo F. Padovan 19260a708f8fSGustavo F. Padovan req->dcid = cpu_to_le16(pi->dcid); 19270a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0x0000); 19280a708f8fSGustavo F. Padovan 19290a708f8fSGustavo F. Padovan return ptr - data; 19300a708f8fSGustavo F. Padovan } 19310a708f8fSGustavo F. Padovan 19320a708f8fSGustavo F. Padovan static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) 19330a708f8fSGustavo F. Padovan { 19340a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 19350a708f8fSGustavo F. Padovan void *ptr = rsp->data; 19360a708f8fSGustavo F. Padovan 19370a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 19380a708f8fSGustavo F. Padovan 19390a708f8fSGustavo F. Padovan rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); 19400a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 19410a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 19420a708f8fSGustavo F. Padovan 19430a708f8fSGustavo F. Padovan return ptr - data; 19440a708f8fSGustavo F. Padovan } 19450a708f8fSGustavo F. Padovan 1946710f9b0aSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct sock *sk) 1947710f9b0aSGustavo F. Padovan { 1948710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 1949710f9b0aSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 1950710f9b0aSGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1951710f9b0aSGustavo F. Padovan u8 buf[128]; 1952710f9b0aSGustavo F. Padovan 1953710f9b0aSGustavo F. Padovan sk->sk_state = BT_CONFIG; 1954710f9b0aSGustavo F. Padovan 1955710f9b0aSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 1956710f9b0aSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 1957710f9b0aSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 1958710f9b0aSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 1959710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 1960710f9b0aSGustavo F. Padovan L2CAP_CONN_RSP, sizeof(rsp), &rsp); 1961710f9b0aSGustavo F. Padovan 1962710f9b0aSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) 1963710f9b0aSGustavo F. Padovan return; 1964710f9b0aSGustavo F. Padovan 1965710f9b0aSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 1966710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 1967710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 1968710f9b0aSGustavo F. Padovan chan->num_conf_req++; 1969710f9b0aSGustavo F. Padovan } 1970710f9b0aSGustavo F. Padovan 19710a708f8fSGustavo F. Padovan static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) 19720a708f8fSGustavo F. Padovan { 19730a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 19740a708f8fSGustavo F. Padovan int type, olen; 19750a708f8fSGustavo F. Padovan unsigned long val; 19760a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 19770a708f8fSGustavo F. Padovan 19780a708f8fSGustavo F. Padovan BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); 19790a708f8fSGustavo F. Padovan 19800a708f8fSGustavo F. Padovan if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) 19810a708f8fSGustavo F. Padovan return; 19820a708f8fSGustavo F. Padovan 19830a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 19840a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 19850a708f8fSGustavo F. Padovan 19860a708f8fSGustavo F. Padovan switch (type) { 19870a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 19880a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 19890a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 19900a708f8fSGustavo F. Padovan goto done; 19910a708f8fSGustavo F. Padovan } 19920a708f8fSGustavo F. Padovan } 19930a708f8fSGustavo F. Padovan 19940a708f8fSGustavo F. Padovan done: 19950a708f8fSGustavo F. Padovan switch (rfc.mode) { 19960a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 19970a708f8fSGustavo F. Padovan pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 19980a708f8fSGustavo F. Padovan pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 19990a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 20000a708f8fSGustavo F. Padovan break; 20010a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 20020a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 20030a708f8fSGustavo F. Padovan } 20040a708f8fSGustavo F. Padovan } 20050a708f8fSGustavo F. Padovan 20060a708f8fSGustavo F. Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 20070a708f8fSGustavo F. Padovan { 20080a708f8fSGustavo F. Padovan struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; 20090a708f8fSGustavo F. Padovan 20100a708f8fSGustavo F. Padovan if (rej->reason != 0x0000) 20110a708f8fSGustavo F. Padovan return 0; 20120a708f8fSGustavo F. Padovan 20130a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 20140a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 20150a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 20160a708f8fSGustavo F. Padovan 20170a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 20180a708f8fSGustavo F. Padovan conn->info_ident = 0; 20190a708f8fSGustavo F. Padovan 20200a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 20210a708f8fSGustavo F. Padovan } 20220a708f8fSGustavo F. Padovan 20230a708f8fSGustavo F. Padovan return 0; 20240a708f8fSGustavo F. Padovan } 20250a708f8fSGustavo F. Padovan 20260a708f8fSGustavo F. Padovan static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 20270a708f8fSGustavo F. Padovan { 20280a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 20290a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 203073ffa904SGustavo F. Padovan struct l2cap_chan *chan = NULL; 20310a708f8fSGustavo F. Padovan struct sock *parent, *sk = NULL; 20320a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 20330a708f8fSGustavo F. Padovan 20340a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 20350a708f8fSGustavo F. Padovan __le16 psm = req->psm; 20360a708f8fSGustavo F. Padovan 20370a708f8fSGustavo F. Padovan BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); 20380a708f8fSGustavo F. Padovan 20390a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 20400a708f8fSGustavo F. Padovan parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); 20410a708f8fSGustavo F. Padovan if (!parent) { 20420a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 20430a708f8fSGustavo F. Padovan goto sendresp; 20440a708f8fSGustavo F. Padovan } 20450a708f8fSGustavo F. Padovan 20460a708f8fSGustavo F. Padovan bh_lock_sock(parent); 20470a708f8fSGustavo F. Padovan 20480a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 20490a708f8fSGustavo F. Padovan if (psm != cpu_to_le16(0x0001) && 20500a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 20510a708f8fSGustavo F. Padovan conn->disc_reason = 0x05; 20520a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 20530a708f8fSGustavo F. Padovan goto response; 20540a708f8fSGustavo F. Padovan } 20550a708f8fSGustavo F. Padovan 20560a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 20570a708f8fSGustavo F. Padovan 20580a708f8fSGustavo F. Padovan /* Check for backlog size */ 20590a708f8fSGustavo F. Padovan if (sk_acceptq_is_full(parent)) { 20600a708f8fSGustavo F. Padovan BT_DBG("backlog full %d", parent->sk_ack_backlog); 20610a708f8fSGustavo F. Padovan goto response; 20620a708f8fSGustavo F. Padovan } 20630a708f8fSGustavo F. Padovan 20640a708f8fSGustavo F. Padovan sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); 20650a708f8fSGustavo F. Padovan if (!sk) 20660a708f8fSGustavo F. Padovan goto response; 20670a708f8fSGustavo F. Padovan 206848454079SGustavo F. Padovan chan = l2cap_chan_alloc(sk); 206948454079SGustavo F. Padovan if (!chan) { 207048454079SGustavo F. Padovan l2cap_sock_kill(sk); 207148454079SGustavo F. Padovan goto response; 207248454079SGustavo F. Padovan } 207348454079SGustavo F. Padovan 2074baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 20750a708f8fSGustavo F. Padovan 20760a708f8fSGustavo F. Padovan /* Check if we already have channel with that dcid */ 2077baa7e1faSGustavo F. Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) { 2078baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 20790a708f8fSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 20800a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 20810a708f8fSGustavo F. Padovan goto response; 20820a708f8fSGustavo F. Padovan } 20830a708f8fSGustavo F. Padovan 20840a708f8fSGustavo F. Padovan hci_conn_hold(conn->hcon); 20850a708f8fSGustavo F. Padovan 20860a708f8fSGustavo F. Padovan l2cap_sock_init(sk, parent); 20870a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->src, conn->src); 20880a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->dst, conn->dst); 20890a708f8fSGustavo F. Padovan l2cap_pi(sk)->psm = psm; 20900a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = scid; 20910a708f8fSGustavo F. Padovan 2092d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 2093d1010240SGustavo F. Padovan 209448454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 209548454079SGustavo F. Padovan 209648454079SGustavo F. Padovan l2cap_pi(sk)->chan = chan; 209748454079SGustavo F. Padovan 20980a708f8fSGustavo F. Padovan dcid = l2cap_pi(sk)->scid; 20990a708f8fSGustavo F. Padovan 21000a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, sk->sk_sndtimeo); 21010a708f8fSGustavo F. Padovan 2102fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 21030a708f8fSGustavo F. Padovan 21040a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 21050a708f8fSGustavo F. Padovan if (l2cap_check_security(sk)) { 21060a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 21070a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 21080a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 21090a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 21100a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 21110a708f8fSGustavo F. Padovan } else { 21120a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 21130a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 21140a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 21150a708f8fSGustavo F. Padovan } 21160a708f8fSGustavo F. Padovan } else { 21170a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 21180a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 21190a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 21200a708f8fSGustavo F. Padovan } 21210a708f8fSGustavo F. Padovan } else { 21220a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 21230a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 21240a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 21250a708f8fSGustavo F. Padovan } 21260a708f8fSGustavo F. Padovan 2127baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 21280a708f8fSGustavo F. Padovan 21290a708f8fSGustavo F. Padovan response: 21300a708f8fSGustavo F. Padovan bh_unlock_sock(parent); 21310a708f8fSGustavo F. Padovan 21320a708f8fSGustavo F. Padovan sendresp: 21330a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 21340a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 21350a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 21360a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 21370a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); 21380a708f8fSGustavo F. Padovan 21390a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 21400a708f8fSGustavo F. Padovan struct l2cap_info_req info; 21410a708f8fSGustavo F. Padovan info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 21420a708f8fSGustavo F. Padovan 21430a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 21440a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 21450a708f8fSGustavo F. Padovan 21460a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 21470a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 21480a708f8fSGustavo F. Padovan 21490a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 21500a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(info), &info); 21510a708f8fSGustavo F. Padovan } 21520a708f8fSGustavo F. Padovan 215373ffa904SGustavo F. Padovan if (chan && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && 21540a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 21550a708f8fSGustavo F. Padovan u8 buf[128]; 21560a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 21570a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 215873ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 215973ffa904SGustavo F. Padovan chan->num_conf_req++; 21600a708f8fSGustavo F. Padovan } 21610a708f8fSGustavo F. Padovan 21620a708f8fSGustavo F. Padovan return 0; 21630a708f8fSGustavo F. Padovan } 21640a708f8fSGustavo F. Padovan 21650a708f8fSGustavo F. Padovan static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 21660a708f8fSGustavo F. Padovan { 21670a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 21680a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 216948454079SGustavo F. Padovan struct l2cap_chan *chan; 21700a708f8fSGustavo F. Padovan struct sock *sk; 21710a708f8fSGustavo F. Padovan u8 req[128]; 21720a708f8fSGustavo F. Padovan 21730a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 21740a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 21750a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 21760a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 21770a708f8fSGustavo F. Padovan 21780a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); 21790a708f8fSGustavo F. Padovan 21800a708f8fSGustavo F. Padovan if (scid) { 2181baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 218248454079SGustavo F. Padovan if (!chan) 21830a708f8fSGustavo F. Padovan return -EFAULT; 21840a708f8fSGustavo F. Padovan } else { 2185baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_ident(conn, cmd->ident); 218648454079SGustavo F. Padovan if (!chan) 21870a708f8fSGustavo F. Padovan return -EFAULT; 21880a708f8fSGustavo F. Padovan } 21890a708f8fSGustavo F. Padovan 219048454079SGustavo F. Padovan sk = chan->sk; 219148454079SGustavo F. Padovan 21920a708f8fSGustavo F. Padovan switch (result) { 21930a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 21940a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 2195fc7f8a7eSGustavo F. Padovan chan->ident = 0; 21960a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = dcid; 21970a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; 21980a708f8fSGustavo F. Padovan 21990a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) 22000a708f8fSGustavo F. Padovan break; 22010a708f8fSGustavo F. Padovan 22020a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 22030a708f8fSGustavo F. Padovan 22040a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 220573ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 220673ffa904SGustavo F. Padovan chan->num_conf_req++; 22070a708f8fSGustavo F. Padovan break; 22080a708f8fSGustavo F. Padovan 22090a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 22100a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 22110a708f8fSGustavo F. Padovan break; 22120a708f8fSGustavo F. Padovan 22130a708f8fSGustavo F. Padovan default: 22140a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 22150a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 22160a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 22170a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 22180a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 5); 22190a708f8fSGustavo F. Padovan break; 22200a708f8fSGustavo F. Padovan } 22210a708f8fSGustavo F. Padovan 222248454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 22230a708f8fSGustavo F. Padovan break; 22240a708f8fSGustavo F. Padovan } 22250a708f8fSGustavo F. Padovan 22260a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 22270a708f8fSGustavo F. Padovan return 0; 22280a708f8fSGustavo F. Padovan } 22290a708f8fSGustavo F. Padovan 22300a708f8fSGustavo F. Padovan static inline void set_default_fcs(struct l2cap_pinfo *pi) 22310a708f8fSGustavo F. Padovan { 22320a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 22330a708f8fSGustavo F. Padovan * sides request it. 22340a708f8fSGustavo F. Padovan */ 22350a708f8fSGustavo F. Padovan if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) 22360a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 22370a708f8fSGustavo F. Padovan else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) 22380a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_CRC16; 22390a708f8fSGustavo F. Padovan } 22400a708f8fSGustavo F. Padovan 22410a708f8fSGustavo F. Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 22420a708f8fSGustavo F. Padovan { 22430a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 22440a708f8fSGustavo F. Padovan u16 dcid, flags; 22450a708f8fSGustavo F. Padovan u8 rsp[64]; 224648454079SGustavo F. Padovan struct l2cap_chan *chan; 22470a708f8fSGustavo F. Padovan struct sock *sk; 22480a708f8fSGustavo F. Padovan int len; 22490a708f8fSGustavo F. Padovan 22500a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 22510a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 22520a708f8fSGustavo F. Padovan 22530a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 22540a708f8fSGustavo F. Padovan 2255baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 225648454079SGustavo F. Padovan if (!chan) 22570a708f8fSGustavo F. Padovan return -ENOENT; 22580a708f8fSGustavo F. Padovan 225948454079SGustavo F. Padovan sk = chan->sk; 226048454079SGustavo F. Padovan 22610a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONFIG) { 22620a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 22630a708f8fSGustavo F. Padovan 22640a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0x0002); 22650a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 22660a708f8fSGustavo F. Padovan sizeof(rej), &rej); 22670a708f8fSGustavo F. Padovan goto unlock; 22680a708f8fSGustavo F. Padovan } 22690a708f8fSGustavo F. Padovan 22700a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 22710a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 227273ffa904SGustavo F. Padovan if (chan->conf_len + len > sizeof(chan->conf_req)) { 22730a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 22740a708f8fSGustavo F. Padovan l2cap_build_conf_rsp(sk, rsp, 22750a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 22760a708f8fSGustavo F. Padovan goto unlock; 22770a708f8fSGustavo F. Padovan } 22780a708f8fSGustavo F. Padovan 22790a708f8fSGustavo F. Padovan /* Store config. */ 228073ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 228173ffa904SGustavo F. Padovan chan->conf_len += len; 22820a708f8fSGustavo F. Padovan 22830a708f8fSGustavo F. Padovan if (flags & 0x0001) { 22840a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 22850a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 22860a708f8fSGustavo F. Padovan l2cap_build_conf_rsp(sk, rsp, 22870a708f8fSGustavo F. Padovan L2CAP_CONF_SUCCESS, 0x0001), rsp); 22880a708f8fSGustavo F. Padovan goto unlock; 22890a708f8fSGustavo F. Padovan } 22900a708f8fSGustavo F. Padovan 22910a708f8fSGustavo F. Padovan /* Complete config. */ 229273ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 22930a708f8fSGustavo F. Padovan if (len < 0) { 22940a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 22950a708f8fSGustavo F. Padovan goto unlock; 22960a708f8fSGustavo F. Padovan } 22970a708f8fSGustavo F. Padovan 22980a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 229973ffa904SGustavo F. Padovan chan->num_conf_rsp++; 23000a708f8fSGustavo F. Padovan 23010a708f8fSGustavo F. Padovan /* Reset config buffer. */ 230273ffa904SGustavo F. Padovan chan->conf_len = 0; 23030a708f8fSGustavo F. Padovan 23040a708f8fSGustavo F. Padovan if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) 23050a708f8fSGustavo F. Padovan goto unlock; 23060a708f8fSGustavo F. Padovan 23070a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { 23080a708f8fSGustavo F. Padovan set_default_fcs(l2cap_pi(sk)); 23090a708f8fSGustavo F. Padovan 23100a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 23110a708f8fSGustavo F. Padovan 231242e5c802SGustavo F. Padovan chan->next_tx_seq = 0; 231342e5c802SGustavo F. Padovan chan->expected_tx_seq = 0; 23140a708f8fSGustavo F. Padovan __skb_queue_head_init(TX_QUEUE(sk)); 23150a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) 2316525cd185SGustavo F. Padovan l2cap_ertm_init(chan); 23170a708f8fSGustavo F. Padovan 23180a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 23190a708f8fSGustavo F. Padovan goto unlock; 23200a708f8fSGustavo F. Padovan } 23210a708f8fSGustavo F. Padovan 23220a708f8fSGustavo F. Padovan if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { 23230a708f8fSGustavo F. Padovan u8 buf[64]; 23240a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 23250a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 232673ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 232773ffa904SGustavo F. Padovan chan->num_conf_req++; 23280a708f8fSGustavo F. Padovan } 23290a708f8fSGustavo F. Padovan 23300a708f8fSGustavo F. Padovan unlock: 23310a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 23320a708f8fSGustavo F. Padovan return 0; 23330a708f8fSGustavo F. Padovan } 23340a708f8fSGustavo F. Padovan 23350a708f8fSGustavo F. Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 23360a708f8fSGustavo F. Padovan { 23370a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 23380a708f8fSGustavo F. Padovan u16 scid, flags, result; 233948454079SGustavo F. Padovan struct l2cap_chan *chan; 23400a708f8fSGustavo F. Padovan struct sock *sk; 23410a708f8fSGustavo F. Padovan int len = cmd->len - sizeof(*rsp); 23420a708f8fSGustavo F. Padovan 23430a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 23440a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 23450a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 23460a708f8fSGustavo F. Padovan 23470a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", 23480a708f8fSGustavo F. Padovan scid, flags, result); 23490a708f8fSGustavo F. Padovan 2350baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 235148454079SGustavo F. Padovan if (!chan) 23520a708f8fSGustavo F. Padovan return 0; 23530a708f8fSGustavo F. Padovan 235448454079SGustavo F. Padovan sk = chan->sk; 235548454079SGustavo F. Padovan 23560a708f8fSGustavo F. Padovan switch (result) { 23570a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 23580a708f8fSGustavo F. Padovan l2cap_conf_rfc_get(sk, rsp->data, len); 23590a708f8fSGustavo F. Padovan break; 23600a708f8fSGustavo F. Padovan 23610a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 236273ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 23630a708f8fSGustavo F. Padovan char req[64]; 23640a708f8fSGustavo F. Padovan 23650a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 23660a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 23670a708f8fSGustavo F. Padovan goto done; 23680a708f8fSGustavo F. Padovan } 23690a708f8fSGustavo F. Padovan 23700a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 23710a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 23720a708f8fSGustavo F. Padovan len = l2cap_parse_conf_rsp(sk, rsp->data, 23730a708f8fSGustavo F. Padovan len, req, &result); 23740a708f8fSGustavo F. Padovan if (len < 0) { 23750a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 23760a708f8fSGustavo F. Padovan goto done; 23770a708f8fSGustavo F. Padovan } 23780a708f8fSGustavo F. Padovan 23790a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 23800a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 238173ffa904SGustavo F. Padovan chan->num_conf_req++; 23820a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 23830a708f8fSGustavo F. Padovan goto done; 23840a708f8fSGustavo F. Padovan break; 23850a708f8fSGustavo F. Padovan } 23860a708f8fSGustavo F. Padovan 23870a708f8fSGustavo F. Padovan default: 23880a708f8fSGustavo F. Padovan sk->sk_err = ECONNRESET; 23890a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ * 5); 23900a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 23910a708f8fSGustavo F. Padovan goto done; 23920a708f8fSGustavo F. Padovan } 23930a708f8fSGustavo F. Padovan 23940a708f8fSGustavo F. Padovan if (flags & 0x01) 23950a708f8fSGustavo F. Padovan goto done; 23960a708f8fSGustavo F. Padovan 23970a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; 23980a708f8fSGustavo F. Padovan 23990a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { 24000a708f8fSGustavo F. Padovan set_default_fcs(l2cap_pi(sk)); 24010a708f8fSGustavo F. Padovan 24020a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 240342e5c802SGustavo F. Padovan chan->next_tx_seq = 0; 240442e5c802SGustavo F. Padovan chan->expected_tx_seq = 0; 24050a708f8fSGustavo F. Padovan __skb_queue_head_init(TX_QUEUE(sk)); 24060a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) 2407525cd185SGustavo F. Padovan l2cap_ertm_init(chan); 24080a708f8fSGustavo F. Padovan 24090a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 24100a708f8fSGustavo F. Padovan } 24110a708f8fSGustavo F. Padovan 24120a708f8fSGustavo F. Padovan done: 24130a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24140a708f8fSGustavo F. Padovan return 0; 24150a708f8fSGustavo F. Padovan } 24160a708f8fSGustavo F. Padovan 24170a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24180a708f8fSGustavo F. Padovan { 24190a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 24200a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 24210a708f8fSGustavo F. Padovan u16 dcid, scid; 242248454079SGustavo F. Padovan struct l2cap_chan *chan; 24230a708f8fSGustavo F. Padovan struct sock *sk; 24240a708f8fSGustavo F. Padovan 24250a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 24260a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 24270a708f8fSGustavo F. Padovan 24280a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 24290a708f8fSGustavo F. Padovan 2430baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 243148454079SGustavo F. Padovan if (!chan) 24320a708f8fSGustavo F. Padovan return 0; 24330a708f8fSGustavo F. Padovan 243448454079SGustavo F. Padovan sk = chan->sk; 243548454079SGustavo F. Padovan 24360a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 24370a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 24380a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 24390a708f8fSGustavo F. Padovan 24400a708f8fSGustavo F. Padovan sk->sk_shutdown = SHUTDOWN_MASK; 24410a708f8fSGustavo F. Padovan 24420a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 24430a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 24440a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 24450a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 24460a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 5); 24470a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24480a708f8fSGustavo F. Padovan return 0; 24490a708f8fSGustavo F. Padovan } 24500a708f8fSGustavo F. Padovan 245148454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 24520a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24530a708f8fSGustavo F. Padovan 24540a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 24550a708f8fSGustavo F. Padovan return 0; 24560a708f8fSGustavo F. Padovan } 24570a708f8fSGustavo F. Padovan 24580a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24590a708f8fSGustavo F. Padovan { 24600a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 24610a708f8fSGustavo F. Padovan u16 dcid, scid; 246248454079SGustavo F. Padovan struct l2cap_chan *chan; 24630a708f8fSGustavo F. Padovan struct sock *sk; 24640a708f8fSGustavo F. Padovan 24650a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 24660a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 24670a708f8fSGustavo F. Padovan 24680a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 24690a708f8fSGustavo F. Padovan 2470baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 247148454079SGustavo F. Padovan if (!chan) 24720a708f8fSGustavo F. Padovan return 0; 24730a708f8fSGustavo F. Padovan 247448454079SGustavo F. Padovan sk = chan->sk; 247548454079SGustavo F. Padovan 24760a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 24770a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 24780a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 24790a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 24800a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 5); 24810a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24820a708f8fSGustavo F. Padovan return 0; 24830a708f8fSGustavo F. Padovan } 24840a708f8fSGustavo F. Padovan 248548454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 24860a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24870a708f8fSGustavo F. Padovan 24880a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 24890a708f8fSGustavo F. Padovan return 0; 24900a708f8fSGustavo F. Padovan } 24910a708f8fSGustavo F. Padovan 24920a708f8fSGustavo F. Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24930a708f8fSGustavo F. Padovan { 24940a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 24950a708f8fSGustavo F. Padovan u16 type; 24960a708f8fSGustavo F. Padovan 24970a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 24980a708f8fSGustavo F. Padovan 24990a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 25000a708f8fSGustavo F. Padovan 25010a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 25020a708f8fSGustavo F. Padovan u8 buf[8]; 25030a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 25040a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 25050a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 25060a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 25070a708f8fSGustavo F. Padovan if (!disable_ertm) 25080a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 25090a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 25100a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 25110a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 25120a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 25130a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 25140a708f8fSGustavo F. Padovan u8 buf[12]; 25150a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 25160a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 25170a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 25180a708f8fSGustavo F. Padovan memcpy(buf + 4, l2cap_fixed_chan, 8); 25190a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 25200a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 25210a708f8fSGustavo F. Padovan } else { 25220a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 25230a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 25240a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); 25250a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 25260a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(rsp), &rsp); 25270a708f8fSGustavo F. Padovan } 25280a708f8fSGustavo F. Padovan 25290a708f8fSGustavo F. Padovan return 0; 25300a708f8fSGustavo F. Padovan } 25310a708f8fSGustavo F. Padovan 25320a708f8fSGustavo F. Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 25330a708f8fSGustavo F. Padovan { 25340a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 25350a708f8fSGustavo F. Padovan u16 type, result; 25360a708f8fSGustavo F. Padovan 25370a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 25380a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 25390a708f8fSGustavo F. Padovan 25400a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 25410a708f8fSGustavo F. Padovan 2542e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 2543e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 2544e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 2545e90165beSAndrei Emeltchenko return 0; 2546e90165beSAndrei Emeltchenko 25470a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 25480a708f8fSGustavo F. Padovan 25490a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 25500a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 25510a708f8fSGustavo F. Padovan conn->info_ident = 0; 25520a708f8fSGustavo F. Padovan 25530a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 25540a708f8fSGustavo F. Padovan 25550a708f8fSGustavo F. Padovan return 0; 25560a708f8fSGustavo F. Padovan } 25570a708f8fSGustavo F. Padovan 25580a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 25590a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 25600a708f8fSGustavo F. Padovan 25610a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 25620a708f8fSGustavo F. Padovan struct l2cap_info_req req; 25630a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 25640a708f8fSGustavo F. Padovan 25650a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 25660a708f8fSGustavo F. Padovan 25670a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 25680a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 25690a708f8fSGustavo F. Padovan } else { 25700a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 25710a708f8fSGustavo F. Padovan conn->info_ident = 0; 25720a708f8fSGustavo F. Padovan 25730a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 25740a708f8fSGustavo F. Padovan } 25750a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 25760a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 25770a708f8fSGustavo F. Padovan conn->info_ident = 0; 25780a708f8fSGustavo F. Padovan 25790a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 25800a708f8fSGustavo F. Padovan } 25810a708f8fSGustavo F. Padovan 25820a708f8fSGustavo F. Padovan return 0; 25830a708f8fSGustavo F. Padovan } 25840a708f8fSGustavo F. Padovan 2585e2174ca4SGustavo F. Padovan static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, 2586de73115aSClaudio Takahasi u16 to_multiplier) 2587de73115aSClaudio Takahasi { 2588de73115aSClaudio Takahasi u16 max_latency; 2589de73115aSClaudio Takahasi 2590de73115aSClaudio Takahasi if (min > max || min < 6 || max > 3200) 2591de73115aSClaudio Takahasi return -EINVAL; 2592de73115aSClaudio Takahasi 2593de73115aSClaudio Takahasi if (to_multiplier < 10 || to_multiplier > 3200) 2594de73115aSClaudio Takahasi return -EINVAL; 2595de73115aSClaudio Takahasi 2596de73115aSClaudio Takahasi if (max >= to_multiplier * 8) 2597de73115aSClaudio Takahasi return -EINVAL; 2598de73115aSClaudio Takahasi 2599de73115aSClaudio Takahasi max_latency = (to_multiplier * 8 / max) - 1; 2600de73115aSClaudio Takahasi if (latency > 499 || latency > max_latency) 2601de73115aSClaudio Takahasi return -EINVAL; 2602de73115aSClaudio Takahasi 2603de73115aSClaudio Takahasi return 0; 2604de73115aSClaudio Takahasi } 2605de73115aSClaudio Takahasi 2606de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 2607de73115aSClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 2608de73115aSClaudio Takahasi { 2609de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 2610de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 2611de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 2612de73115aSClaudio Takahasi u16 min, max, latency, to_multiplier, cmd_len; 26132ce603ebSClaudio Takahasi int err; 2614de73115aSClaudio Takahasi 2615de73115aSClaudio Takahasi if (!(hcon->link_mode & HCI_LM_MASTER)) 2616de73115aSClaudio Takahasi return -EINVAL; 2617de73115aSClaudio Takahasi 2618de73115aSClaudio Takahasi cmd_len = __le16_to_cpu(cmd->len); 2619de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 2620de73115aSClaudio Takahasi return -EPROTO; 2621de73115aSClaudio Takahasi 2622de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 2623de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 2624de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 2625de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 2626de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 2627de73115aSClaudio Takahasi 2628de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 2629de73115aSClaudio Takahasi min, max, latency, to_multiplier); 2630de73115aSClaudio Takahasi 2631de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 26322ce603ebSClaudio Takahasi 26332ce603ebSClaudio Takahasi err = l2cap_check_conn_param(min, max, latency, to_multiplier); 26342ce603ebSClaudio Takahasi if (err) 2635de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 2636de73115aSClaudio Takahasi else 2637de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 2638de73115aSClaudio Takahasi 2639de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 2640de73115aSClaudio Takahasi sizeof(rsp), &rsp); 2641de73115aSClaudio Takahasi 26422ce603ebSClaudio Takahasi if (!err) 26432ce603ebSClaudio Takahasi hci_le_conn_update(hcon, min, max, latency, to_multiplier); 26442ce603ebSClaudio Takahasi 2645de73115aSClaudio Takahasi return 0; 2646de73115aSClaudio Takahasi } 2647de73115aSClaudio Takahasi 26483300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 26493300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 26503300d9a9SClaudio Takahasi { 26513300d9a9SClaudio Takahasi int err = 0; 26523300d9a9SClaudio Takahasi 26533300d9a9SClaudio Takahasi switch (cmd->code) { 26543300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 26553300d9a9SClaudio Takahasi l2cap_command_rej(conn, cmd, data); 26563300d9a9SClaudio Takahasi break; 26573300d9a9SClaudio Takahasi 26583300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 26593300d9a9SClaudio Takahasi err = l2cap_connect_req(conn, cmd, data); 26603300d9a9SClaudio Takahasi break; 26613300d9a9SClaudio Takahasi 26623300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 26633300d9a9SClaudio Takahasi err = l2cap_connect_rsp(conn, cmd, data); 26643300d9a9SClaudio Takahasi break; 26653300d9a9SClaudio Takahasi 26663300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 26673300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 26683300d9a9SClaudio Takahasi break; 26693300d9a9SClaudio Takahasi 26703300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 26713300d9a9SClaudio Takahasi err = l2cap_config_rsp(conn, cmd, data); 26723300d9a9SClaudio Takahasi break; 26733300d9a9SClaudio Takahasi 26743300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 26753300d9a9SClaudio Takahasi err = l2cap_disconnect_req(conn, cmd, data); 26763300d9a9SClaudio Takahasi break; 26773300d9a9SClaudio Takahasi 26783300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 26793300d9a9SClaudio Takahasi err = l2cap_disconnect_rsp(conn, cmd, data); 26803300d9a9SClaudio Takahasi break; 26813300d9a9SClaudio Takahasi 26823300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 26833300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 26843300d9a9SClaudio Takahasi break; 26853300d9a9SClaudio Takahasi 26863300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 26873300d9a9SClaudio Takahasi break; 26883300d9a9SClaudio Takahasi 26893300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 26903300d9a9SClaudio Takahasi err = l2cap_information_req(conn, cmd, data); 26913300d9a9SClaudio Takahasi break; 26923300d9a9SClaudio Takahasi 26933300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 26943300d9a9SClaudio Takahasi err = l2cap_information_rsp(conn, cmd, data); 26953300d9a9SClaudio Takahasi break; 26963300d9a9SClaudio Takahasi 26973300d9a9SClaudio Takahasi default: 26983300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 26993300d9a9SClaudio Takahasi err = -EINVAL; 27003300d9a9SClaudio Takahasi break; 27013300d9a9SClaudio Takahasi } 27023300d9a9SClaudio Takahasi 27033300d9a9SClaudio Takahasi return err; 27043300d9a9SClaudio Takahasi } 27053300d9a9SClaudio Takahasi 27063300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 27073300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 27083300d9a9SClaudio Takahasi { 27093300d9a9SClaudio Takahasi switch (cmd->code) { 27103300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 27113300d9a9SClaudio Takahasi return 0; 27123300d9a9SClaudio Takahasi 27133300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 2714de73115aSClaudio Takahasi return l2cap_conn_param_update_req(conn, cmd, data); 27153300d9a9SClaudio Takahasi 27163300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 27173300d9a9SClaudio Takahasi return 0; 27183300d9a9SClaudio Takahasi 27193300d9a9SClaudio Takahasi default: 27203300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 27213300d9a9SClaudio Takahasi return -EINVAL; 27223300d9a9SClaudio Takahasi } 27233300d9a9SClaudio Takahasi } 27243300d9a9SClaudio Takahasi 27253300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 27263300d9a9SClaudio Takahasi struct sk_buff *skb) 27270a708f8fSGustavo F. Padovan { 27280a708f8fSGustavo F. Padovan u8 *data = skb->data; 27290a708f8fSGustavo F. Padovan int len = skb->len; 27300a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 27313300d9a9SClaudio Takahasi int err; 27320a708f8fSGustavo F. Padovan 27330a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 27340a708f8fSGustavo F. Padovan 27350a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 27360a708f8fSGustavo F. Padovan u16 cmd_len; 27370a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 27380a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 27390a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 27400a708f8fSGustavo F. Padovan 27410a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 27420a708f8fSGustavo F. Padovan 27430a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); 27440a708f8fSGustavo F. Padovan 27450a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 27460a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 27470a708f8fSGustavo F. Padovan break; 27480a708f8fSGustavo F. Padovan } 27490a708f8fSGustavo F. Padovan 27503300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 27513300d9a9SClaudio Takahasi err = l2cap_le_sig_cmd(conn, &cmd, data); 27523300d9a9SClaudio Takahasi else 27533300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 27540a708f8fSGustavo F. Padovan 27550a708f8fSGustavo F. Padovan if (err) { 27560a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 27572c6d1a2eSGustavo F. Padovan 27582c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 27590a708f8fSGustavo F. Padovan 27600a708f8fSGustavo F. Padovan /* FIXME: Map err to a valid reason */ 27610a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0); 27620a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); 27630a708f8fSGustavo F. Padovan } 27640a708f8fSGustavo F. Padovan 27650a708f8fSGustavo F. Padovan data += cmd_len; 27660a708f8fSGustavo F. Padovan len -= cmd_len; 27670a708f8fSGustavo F. Padovan } 27680a708f8fSGustavo F. Padovan 27690a708f8fSGustavo F. Padovan kfree_skb(skb); 27700a708f8fSGustavo F. Padovan } 27710a708f8fSGustavo F. Padovan 27720a708f8fSGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) 27730a708f8fSGustavo F. Padovan { 27740a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 27750a708f8fSGustavo F. Padovan int hdr_size = L2CAP_HDR_SIZE + 2; 27760a708f8fSGustavo F. Padovan 27770a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 27780a708f8fSGustavo F. Padovan skb_trim(skb, skb->len - 2); 27790a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 27800a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 27810a708f8fSGustavo F. Padovan 27820a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 27830a708f8fSGustavo F. Padovan return -EBADMSG; 27840a708f8fSGustavo F. Padovan } 27850a708f8fSGustavo F. Padovan return 0; 27860a708f8fSGustavo F. Padovan } 27870a708f8fSGustavo F. Padovan 2788525cd185SGustavo F. Padovan static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) 27890a708f8fSGustavo F. Padovan { 27900a708f8fSGustavo F. Padovan u16 control = 0; 27910a708f8fSGustavo F. Padovan 2792*6a026610SGustavo F. Padovan chan->frames_sent = 0; 27930a708f8fSGustavo F. Padovan 279442e5c802SGustavo F. Padovan control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 27950a708f8fSGustavo F. Padovan 2796525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 27970a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 2798525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 2799525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 28000a708f8fSGustavo F. Padovan } 28010a708f8fSGustavo F. Padovan 2802525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY) 2803525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 28040a708f8fSGustavo F. Padovan 2805525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 28060a708f8fSGustavo F. Padovan 2807525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) && 2808*6a026610SGustavo F. Padovan chan->frames_sent == 0) { 28090a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 2810525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 28110a708f8fSGustavo F. Padovan } 28120a708f8fSGustavo F. Padovan } 28130a708f8fSGustavo F. Padovan 281442e5c802SGustavo F. Padovan static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) 28150a708f8fSGustavo F. Padovan { 281642e5c802SGustavo F. Padovan struct sock *sk = chan->sk; 28170a708f8fSGustavo F. Padovan struct sk_buff *next_skb; 28180a708f8fSGustavo F. Padovan int tx_seq_offset, next_tx_seq_offset; 28190a708f8fSGustavo F. Padovan 28200a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 28210a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 28220a708f8fSGustavo F. Padovan 28230a708f8fSGustavo F. Padovan next_skb = skb_peek(SREJ_QUEUE(sk)); 28240a708f8fSGustavo F. Padovan if (!next_skb) { 28250a708f8fSGustavo F. Padovan __skb_queue_tail(SREJ_QUEUE(sk), skb); 28260a708f8fSGustavo F. Padovan return 0; 28270a708f8fSGustavo F. Padovan } 28280a708f8fSGustavo F. Padovan 282942e5c802SGustavo F. Padovan tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; 28300a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 28310a708f8fSGustavo F. Padovan tx_seq_offset += 64; 28320a708f8fSGustavo F. Padovan 28330a708f8fSGustavo F. Padovan do { 28340a708f8fSGustavo F. Padovan if (bt_cb(next_skb)->tx_seq == tx_seq) 28350a708f8fSGustavo F. Padovan return -EINVAL; 28360a708f8fSGustavo F. Padovan 28370a708f8fSGustavo F. Padovan next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - 283842e5c802SGustavo F. Padovan chan->buffer_seq) % 64; 28390a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 28400a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 28410a708f8fSGustavo F. Padovan 28420a708f8fSGustavo F. Padovan if (next_tx_seq_offset > tx_seq_offset) { 28430a708f8fSGustavo F. Padovan __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); 28440a708f8fSGustavo F. Padovan return 0; 28450a708f8fSGustavo F. Padovan } 28460a708f8fSGustavo F. Padovan 28470a708f8fSGustavo F. Padovan if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) 28480a708f8fSGustavo F. Padovan break; 28490a708f8fSGustavo F. Padovan 28500a708f8fSGustavo F. Padovan } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); 28510a708f8fSGustavo F. Padovan 28520a708f8fSGustavo F. Padovan __skb_queue_tail(SREJ_QUEUE(sk), skb); 28530a708f8fSGustavo F. Padovan 28540a708f8fSGustavo F. Padovan return 0; 28550a708f8fSGustavo F. Padovan } 28560a708f8fSGustavo F. Padovan 2857525cd185SGustavo F. Padovan static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) 28580a708f8fSGustavo F. Padovan { 2859525cd185SGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(chan->sk); 28600a708f8fSGustavo F. Padovan struct sk_buff *_skb; 28610a708f8fSGustavo F. Padovan int err; 28620a708f8fSGustavo F. Padovan 28630a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 28640a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 2865525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) 28660a708f8fSGustavo F. Padovan goto drop; 28670a708f8fSGustavo F. Padovan 2868525cd185SGustavo F. Padovan err = sock_queue_rcv_skb(chan->sk, skb); 28690a708f8fSGustavo F. Padovan if (!err) 28700a708f8fSGustavo F. Padovan return err; 28710a708f8fSGustavo F. Padovan 28720a708f8fSGustavo F. Padovan break; 28730a708f8fSGustavo F. Padovan 28740a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 2875525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) 28760a708f8fSGustavo F. Padovan goto drop; 28770a708f8fSGustavo F. Padovan 28780a708f8fSGustavo F. Padovan pi->sdu_len = get_unaligned_le16(skb->data); 28790a708f8fSGustavo F. Padovan 28800a708f8fSGustavo F. Padovan if (pi->sdu_len > pi->imtu) 28810a708f8fSGustavo F. Padovan goto disconnect; 28820a708f8fSGustavo F. Padovan 28830a708f8fSGustavo F. Padovan pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); 28840a708f8fSGustavo F. Padovan if (!pi->sdu) 28850a708f8fSGustavo F. Padovan return -ENOMEM; 28860a708f8fSGustavo F. Padovan 28870a708f8fSGustavo F. Padovan /* pull sdu_len bytes only after alloc, because of Local Busy 28880a708f8fSGustavo F. Padovan * condition we have to be sure that this will be executed 28890a708f8fSGustavo F. Padovan * only once, i.e., when alloc does not fail */ 28900a708f8fSGustavo F. Padovan skb_pull(skb, 2); 28910a708f8fSGustavo F. Padovan 28920a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 28930a708f8fSGustavo F. Padovan 2894525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_SDU; 28950a708f8fSGustavo F. Padovan pi->partial_sdu_len = skb->len; 28960a708f8fSGustavo F. Padovan break; 28970a708f8fSGustavo F. Padovan 28980a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 2899525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 29000a708f8fSGustavo F. Padovan goto disconnect; 29010a708f8fSGustavo F. Padovan 29020a708f8fSGustavo F. Padovan if (!pi->sdu) 29030a708f8fSGustavo F. Padovan goto disconnect; 29040a708f8fSGustavo F. Padovan 29050a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 29060a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->sdu_len) 29070a708f8fSGustavo F. Padovan goto drop; 29080a708f8fSGustavo F. Padovan 29090a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 29100a708f8fSGustavo F. Padovan 29110a708f8fSGustavo F. Padovan break; 29120a708f8fSGustavo F. Padovan 29130a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 2914525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 29150a708f8fSGustavo F. Padovan goto disconnect; 29160a708f8fSGustavo F. Padovan 29170a708f8fSGustavo F. Padovan if (!pi->sdu) 29180a708f8fSGustavo F. Padovan goto disconnect; 29190a708f8fSGustavo F. Padovan 2920525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) { 29210a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 29220a708f8fSGustavo F. Padovan 29230a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->imtu) 29240a708f8fSGustavo F. Padovan goto drop; 29250a708f8fSGustavo F. Padovan 29260a708f8fSGustavo F. Padovan if (pi->partial_sdu_len != pi->sdu_len) 29270a708f8fSGustavo F. Padovan goto drop; 29280a708f8fSGustavo F. Padovan 29290a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 29300a708f8fSGustavo F. Padovan } 29310a708f8fSGustavo F. Padovan 29320a708f8fSGustavo F. Padovan _skb = skb_clone(pi->sdu, GFP_ATOMIC); 29330a708f8fSGustavo F. Padovan if (!_skb) { 2934525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_RETRY; 29350a708f8fSGustavo F. Padovan return -ENOMEM; 29360a708f8fSGustavo F. Padovan } 29370a708f8fSGustavo F. Padovan 2938525cd185SGustavo F. Padovan err = sock_queue_rcv_skb(chan->sk, _skb); 29390a708f8fSGustavo F. Padovan if (err < 0) { 29400a708f8fSGustavo F. Padovan kfree_skb(_skb); 2941525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_RETRY; 29420a708f8fSGustavo F. Padovan return err; 29430a708f8fSGustavo F. Padovan } 29440a708f8fSGustavo F. Padovan 2945525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SAR_RETRY; 2946525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SAR_SDU; 29470a708f8fSGustavo F. Padovan 29480a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 29490a708f8fSGustavo F. Padovan break; 29500a708f8fSGustavo F. Padovan } 29510a708f8fSGustavo F. Padovan 29520a708f8fSGustavo F. Padovan kfree_skb(skb); 29530a708f8fSGustavo F. Padovan return 0; 29540a708f8fSGustavo F. Padovan 29550a708f8fSGustavo F. Padovan drop: 29560a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 29570a708f8fSGustavo F. Padovan pi->sdu = NULL; 29580a708f8fSGustavo F. Padovan 29590a708f8fSGustavo F. Padovan disconnect: 2960525cd185SGustavo F. Padovan l2cap_send_disconn_req(pi->conn, chan->sk, ECONNRESET); 29610a708f8fSGustavo F. Padovan kfree_skb(skb); 29620a708f8fSGustavo F. Padovan return 0; 29630a708f8fSGustavo F. Padovan } 29640a708f8fSGustavo F. Padovan 2965525cd185SGustavo F. Padovan static int l2cap_try_push_rx_skb(struct l2cap_chan *chan) 29660a708f8fSGustavo F. Padovan { 2967525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 29680a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 29690a708f8fSGustavo F. Padovan struct sk_buff *skb; 29700a708f8fSGustavo F. Padovan u16 control; 29710a708f8fSGustavo F. Padovan int err; 29720a708f8fSGustavo F. Padovan 29730a708f8fSGustavo F. Padovan while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { 29740a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 2975525cd185SGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(chan, skb, control); 29760a708f8fSGustavo F. Padovan if (err < 0) { 29770a708f8fSGustavo F. Padovan skb_queue_head(BUSY_QUEUE(sk), skb); 29780a708f8fSGustavo F. Padovan return -EBUSY; 29790a708f8fSGustavo F. Padovan } 29800a708f8fSGustavo F. Padovan 298142e5c802SGustavo F. Padovan chan->buffer_seq = (chan->buffer_seq + 1) % 64; 29820a708f8fSGustavo F. Padovan } 29830a708f8fSGustavo F. Padovan 2984525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_RNR_SENT)) 29850a708f8fSGustavo F. Padovan goto done; 29860a708f8fSGustavo F. Padovan 298742e5c802SGustavo F. Padovan control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 29880a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; 2989525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 2990*6a026610SGustavo F. Padovan chan->retry_count = 1; 29910a708f8fSGustavo F. Padovan 29920a708f8fSGustavo F. Padovan del_timer(&pi->retrans_timer); 29930a708f8fSGustavo F. Padovan __mod_monitor_timer(); 29940a708f8fSGustavo F. Padovan 2995525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_WAIT_F; 29960a708f8fSGustavo F. Padovan 29970a708f8fSGustavo F. Padovan done: 2998525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; 2999525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_RNR_SENT; 30000a708f8fSGustavo F. Padovan 30010a708f8fSGustavo F. Padovan BT_DBG("sk %p, Exit local busy", sk); 30020a708f8fSGustavo F. Padovan 30030a708f8fSGustavo F. Padovan return 0; 30040a708f8fSGustavo F. Padovan } 30050a708f8fSGustavo F. Padovan 30060a708f8fSGustavo F. Padovan static void l2cap_busy_work(struct work_struct *work) 30070a708f8fSGustavo F. Padovan { 30080a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 30090a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = 30100a708f8fSGustavo F. Padovan container_of(work, struct l2cap_pinfo, busy_work); 30110a708f8fSGustavo F. Padovan struct sock *sk = (struct sock *)pi; 30120a708f8fSGustavo F. Padovan int n_tries = 0, timeo = HZ/5, err; 30130a708f8fSGustavo F. Padovan struct sk_buff *skb; 30140a708f8fSGustavo F. Padovan 30150a708f8fSGustavo F. Padovan lock_sock(sk); 30160a708f8fSGustavo F. Padovan 30170a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 30180a708f8fSGustavo F. Padovan while ((skb = skb_peek(BUSY_QUEUE(sk)))) { 30190a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 30200a708f8fSGustavo F. Padovan 30210a708f8fSGustavo F. Padovan if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { 30220a708f8fSGustavo F. Padovan err = -EBUSY; 30230a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, EBUSY); 30240a708f8fSGustavo F. Padovan break; 30250a708f8fSGustavo F. Padovan } 30260a708f8fSGustavo F. Padovan 30270a708f8fSGustavo F. Padovan if (!timeo) 30280a708f8fSGustavo F. Padovan timeo = HZ/5; 30290a708f8fSGustavo F. Padovan 30300a708f8fSGustavo F. Padovan if (signal_pending(current)) { 30310a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 30320a708f8fSGustavo F. Padovan break; 30330a708f8fSGustavo F. Padovan } 30340a708f8fSGustavo F. Padovan 30350a708f8fSGustavo F. Padovan release_sock(sk); 30360a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 30370a708f8fSGustavo F. Padovan lock_sock(sk); 30380a708f8fSGustavo F. Padovan 30390a708f8fSGustavo F. Padovan err = sock_error(sk); 30400a708f8fSGustavo F. Padovan if (err) 30410a708f8fSGustavo F. Padovan break; 30420a708f8fSGustavo F. Padovan 3043525cd185SGustavo F. Padovan if (l2cap_try_push_rx_skb(l2cap_pi(sk)->chan) == 0) 30440a708f8fSGustavo F. Padovan break; 30450a708f8fSGustavo F. Padovan } 30460a708f8fSGustavo F. Padovan 30470a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 30480a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 30490a708f8fSGustavo F. Padovan 30500a708f8fSGustavo F. Padovan release_sock(sk); 30510a708f8fSGustavo F. Padovan } 30520a708f8fSGustavo F. Padovan 3053525cd185SGustavo F. Padovan static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) 30540a708f8fSGustavo F. Padovan { 3055525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 30560a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 30570a708f8fSGustavo F. Padovan int sctrl, err; 30580a708f8fSGustavo F. Padovan 3059525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { 30600a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 30610a708f8fSGustavo F. Padovan __skb_queue_tail(BUSY_QUEUE(sk), skb); 3062525cd185SGustavo F. Padovan return l2cap_try_push_rx_skb(chan); 30630a708f8fSGustavo F. Padovan 30640a708f8fSGustavo F. Padovan 30650a708f8fSGustavo F. Padovan } 30660a708f8fSGustavo F. Padovan 3067525cd185SGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(chan, skb, control); 30680a708f8fSGustavo F. Padovan if (err >= 0) { 306942e5c802SGustavo F. Padovan chan->buffer_seq = (chan->buffer_seq + 1) % 64; 30700a708f8fSGustavo F. Padovan return err; 30710a708f8fSGustavo F. Padovan } 30720a708f8fSGustavo F. Padovan 30730a708f8fSGustavo F. Padovan /* Busy Condition */ 30740a708f8fSGustavo F. Padovan BT_DBG("sk %p, Enter local busy", sk); 30750a708f8fSGustavo F. Padovan 3076525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_LOCAL_BUSY; 30770a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 30780a708f8fSGustavo F. Padovan __skb_queue_tail(BUSY_QUEUE(sk), skb); 30790a708f8fSGustavo F. Padovan 308042e5c802SGustavo F. Padovan sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 30810a708f8fSGustavo F. Padovan sctrl |= L2CAP_SUPER_RCV_NOT_READY; 3082525cd185SGustavo F. Padovan l2cap_send_sframe(chan, sctrl); 30830a708f8fSGustavo F. Padovan 3084525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_RNR_SENT; 30850a708f8fSGustavo F. Padovan 30860a708f8fSGustavo F. Padovan del_timer(&pi->ack_timer); 30870a708f8fSGustavo F. Padovan 30880a708f8fSGustavo F. Padovan queue_work(_busy_wq, &pi->busy_work); 30890a708f8fSGustavo F. Padovan 30900a708f8fSGustavo F. Padovan return err; 30910a708f8fSGustavo F. Padovan } 30920a708f8fSGustavo F. Padovan 3093525cd185SGustavo F. Padovan static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) 30940a708f8fSGustavo F. Padovan { 3095525cd185SGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(chan->sk); 30960a708f8fSGustavo F. Padovan struct sk_buff *_skb; 30970a708f8fSGustavo F. Padovan int err = -EINVAL; 30980a708f8fSGustavo F. Padovan 30990a708f8fSGustavo F. Padovan /* 31000a708f8fSGustavo F. Padovan * TODO: We have to notify the userland if some data is lost with the 31010a708f8fSGustavo F. Padovan * Streaming Mode. 31020a708f8fSGustavo F. Padovan */ 31030a708f8fSGustavo F. Padovan 31040a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 31050a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 3106525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) { 31070a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 31080a708f8fSGustavo F. Padovan break; 31090a708f8fSGustavo F. Padovan } 31100a708f8fSGustavo F. Padovan 3111525cd185SGustavo F. Padovan err = sock_queue_rcv_skb(chan->sk, skb); 31120a708f8fSGustavo F. Padovan if (!err) 31130a708f8fSGustavo F. Padovan return 0; 31140a708f8fSGustavo F. Padovan 31150a708f8fSGustavo F. Padovan break; 31160a708f8fSGustavo F. Padovan 31170a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 3118525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SAR_SDU) { 31190a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 31200a708f8fSGustavo F. Padovan break; 31210a708f8fSGustavo F. Padovan } 31220a708f8fSGustavo F. Padovan 31230a708f8fSGustavo F. Padovan pi->sdu_len = get_unaligned_le16(skb->data); 31240a708f8fSGustavo F. Padovan skb_pull(skb, 2); 31250a708f8fSGustavo F. Padovan 31260a708f8fSGustavo F. Padovan if (pi->sdu_len > pi->imtu) { 31270a708f8fSGustavo F. Padovan err = -EMSGSIZE; 31280a708f8fSGustavo F. Padovan break; 31290a708f8fSGustavo F. Padovan } 31300a708f8fSGustavo F. Padovan 31310a708f8fSGustavo F. Padovan pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); 31320a708f8fSGustavo F. Padovan if (!pi->sdu) { 31330a708f8fSGustavo F. Padovan err = -ENOMEM; 31340a708f8fSGustavo F. Padovan break; 31350a708f8fSGustavo F. Padovan } 31360a708f8fSGustavo F. Padovan 31370a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 31380a708f8fSGustavo F. Padovan 3139525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SAR_SDU; 31400a708f8fSGustavo F. Padovan pi->partial_sdu_len = skb->len; 31410a708f8fSGustavo F. Padovan err = 0; 31420a708f8fSGustavo F. Padovan break; 31430a708f8fSGustavo F. Padovan 31440a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 3145525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 31460a708f8fSGustavo F. Padovan break; 31470a708f8fSGustavo F. Padovan 31480a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 31490a708f8fSGustavo F. Padovan 31500a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 31510a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->sdu_len) 31520a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 31530a708f8fSGustavo F. Padovan else 31540a708f8fSGustavo F. Padovan err = 0; 31550a708f8fSGustavo F. Padovan 31560a708f8fSGustavo F. Padovan break; 31570a708f8fSGustavo F. Padovan 31580a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 3159525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) 31600a708f8fSGustavo F. Padovan break; 31610a708f8fSGustavo F. Padovan 31620a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 31630a708f8fSGustavo F. Padovan 3164525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SAR_SDU; 31650a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 31660a708f8fSGustavo F. Padovan 31670a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->imtu) 31680a708f8fSGustavo F. Padovan goto drop; 31690a708f8fSGustavo F. Padovan 31700a708f8fSGustavo F. Padovan if (pi->partial_sdu_len == pi->sdu_len) { 31710a708f8fSGustavo F. Padovan _skb = skb_clone(pi->sdu, GFP_ATOMIC); 3172525cd185SGustavo F. Padovan err = sock_queue_rcv_skb(chan->sk, _skb); 31730a708f8fSGustavo F. Padovan if (err < 0) 31740a708f8fSGustavo F. Padovan kfree_skb(_skb); 31750a708f8fSGustavo F. Padovan } 31760a708f8fSGustavo F. Padovan err = 0; 31770a708f8fSGustavo F. Padovan 31780a708f8fSGustavo F. Padovan drop: 31790a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 31800a708f8fSGustavo F. Padovan break; 31810a708f8fSGustavo F. Padovan } 31820a708f8fSGustavo F. Padovan 31830a708f8fSGustavo F. Padovan kfree_skb(skb); 31840a708f8fSGustavo F. Padovan return err; 31850a708f8fSGustavo F. Padovan } 31860a708f8fSGustavo F. Padovan 3187525cd185SGustavo F. Padovan static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) 31880a708f8fSGustavo F. Padovan { 3189525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 31900a708f8fSGustavo F. Padovan struct sk_buff *skb; 31910a708f8fSGustavo F. Padovan u16 control; 31920a708f8fSGustavo F. Padovan 31930a708f8fSGustavo F. Padovan while ((skb = skb_peek(SREJ_QUEUE(sk)))) { 31940a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq != tx_seq) 31950a708f8fSGustavo F. Padovan break; 31960a708f8fSGustavo F. Padovan 31970a708f8fSGustavo F. Padovan skb = skb_dequeue(SREJ_QUEUE(sk)); 31980a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 3199525cd185SGustavo F. Padovan l2cap_ertm_reassembly_sdu(chan, skb, control); 320042e5c802SGustavo F. Padovan chan->buffer_seq_srej = 320142e5c802SGustavo F. Padovan (chan->buffer_seq_srej + 1) % 64; 32020a708f8fSGustavo F. Padovan tx_seq = (tx_seq + 1) % 64; 32030a708f8fSGustavo F. Padovan } 32040a708f8fSGustavo F. Padovan } 32050a708f8fSGustavo F. Padovan 3206525cd185SGustavo F. Padovan static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) 32070a708f8fSGustavo F. Padovan { 3208525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 32090a708f8fSGustavo F. Padovan struct srej_list *l, *tmp; 32100a708f8fSGustavo F. Padovan u16 control; 32110a708f8fSGustavo F. Padovan 32120a708f8fSGustavo F. Padovan list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { 32130a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 32140a708f8fSGustavo F. Padovan list_del(&l->list); 32150a708f8fSGustavo F. Padovan kfree(l); 32160a708f8fSGustavo F. Padovan return; 32170a708f8fSGustavo F. Padovan } 32180a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 32190a708f8fSGustavo F. Padovan control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 3220525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 32210a708f8fSGustavo F. Padovan list_del(&l->list); 32220a708f8fSGustavo F. Padovan list_add_tail(&l->list, SREJ_LIST(sk)); 32230a708f8fSGustavo F. Padovan } 32240a708f8fSGustavo F. Padovan } 32250a708f8fSGustavo F. Padovan 3226525cd185SGustavo F. Padovan static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) 32270a708f8fSGustavo F. Padovan { 3228525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 32290a708f8fSGustavo F. Padovan struct srej_list *new; 32300a708f8fSGustavo F. Padovan u16 control; 32310a708f8fSGustavo F. Padovan 323242e5c802SGustavo F. Padovan while (tx_seq != chan->expected_tx_seq) { 32330a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 323442e5c802SGustavo F. Padovan control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 3235525cd185SGustavo F. Padovan l2cap_send_sframe(chan, control); 32360a708f8fSGustavo F. Padovan 32370a708f8fSGustavo F. Padovan new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); 323842e5c802SGustavo F. Padovan new->tx_seq = chan->expected_tx_seq; 323942e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 32400a708f8fSGustavo F. Padovan list_add_tail(&new->list, SREJ_LIST(sk)); 32410a708f8fSGustavo F. Padovan } 324242e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 32430a708f8fSGustavo F. Padovan } 32440a708f8fSGustavo F. Padovan 3245525cd185SGustavo F. Padovan static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) 32460a708f8fSGustavo F. Padovan { 3247525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 32480a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 32490a708f8fSGustavo F. Padovan u8 tx_seq = __get_txseq(rx_control); 32500a708f8fSGustavo F. Padovan u8 req_seq = __get_reqseq(rx_control); 32510a708f8fSGustavo F. Padovan u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; 32520a708f8fSGustavo F. Padovan int tx_seq_offset, expected_tx_seq_offset; 32530a708f8fSGustavo F. Padovan int num_to_ack = (pi->tx_win/6) + 1; 32540a708f8fSGustavo F. Padovan int err = 0; 32550a708f8fSGustavo F. Padovan 3256525cd185SGustavo F. Padovan BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, 3257525cd185SGustavo F. Padovan tx_seq, rx_control); 32580a708f8fSGustavo F. Padovan 32590a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 3260525cd185SGustavo F. Padovan chan->conn_state & L2CAP_CONN_WAIT_F) { 32610a708f8fSGustavo F. Padovan del_timer(&pi->monitor_timer); 3262*6a026610SGustavo F. Padovan if (chan->unacked_frames > 0) 32630a708f8fSGustavo F. Padovan __mod_retrans_timer(); 3264525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_WAIT_F; 32650a708f8fSGustavo F. Padovan } 32660a708f8fSGustavo F. Padovan 326742e5c802SGustavo F. Padovan chan->expected_ack_seq = req_seq; 326842e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 32690a708f8fSGustavo F. Padovan 327042e5c802SGustavo F. Padovan if (tx_seq == chan->expected_tx_seq) 32710a708f8fSGustavo F. Padovan goto expected; 32720a708f8fSGustavo F. Padovan 327342e5c802SGustavo F. Padovan tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; 32740a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 32750a708f8fSGustavo F. Padovan tx_seq_offset += 64; 32760a708f8fSGustavo F. Padovan 32770a708f8fSGustavo F. Padovan /* invalid tx_seq */ 32780a708f8fSGustavo F. Padovan if (tx_seq_offset >= pi->tx_win) { 32790a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 32800a708f8fSGustavo F. Padovan goto drop; 32810a708f8fSGustavo F. Padovan } 32820a708f8fSGustavo F. Padovan 3283525cd185SGustavo F. Padovan if (chan->conn_state == L2CAP_CONN_LOCAL_BUSY) 32840a708f8fSGustavo F. Padovan goto drop; 32850a708f8fSGustavo F. Padovan 3286525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { 32870a708f8fSGustavo F. Padovan struct srej_list *first; 32880a708f8fSGustavo F. Padovan 32890a708f8fSGustavo F. Padovan first = list_first_entry(SREJ_LIST(sk), 32900a708f8fSGustavo F. Padovan struct srej_list, list); 32910a708f8fSGustavo F. Padovan if (tx_seq == first->tx_seq) { 329242e5c802SGustavo F. Padovan l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); 3293525cd185SGustavo F. Padovan l2cap_check_srej_gap(chan, tx_seq); 32940a708f8fSGustavo F. Padovan 32950a708f8fSGustavo F. Padovan list_del(&first->list); 32960a708f8fSGustavo F. Padovan kfree(first); 32970a708f8fSGustavo F. Padovan 32980a708f8fSGustavo F. Padovan if (list_empty(SREJ_LIST(sk))) { 329942e5c802SGustavo F. Padovan chan->buffer_seq = chan->buffer_seq_srej; 3300525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SREJ_SENT; 3301525cd185SGustavo F. Padovan l2cap_send_ack(chan); 33020a708f8fSGustavo F. Padovan BT_DBG("sk %p, Exit SREJ_SENT", sk); 33030a708f8fSGustavo F. Padovan } 33040a708f8fSGustavo F. Padovan } else { 33050a708f8fSGustavo F. Padovan struct srej_list *l; 33060a708f8fSGustavo F. Padovan 33070a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 330842e5c802SGustavo F. Padovan if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) 33090a708f8fSGustavo F. Padovan goto drop; 33100a708f8fSGustavo F. Padovan 33110a708f8fSGustavo F. Padovan list_for_each_entry(l, SREJ_LIST(sk), list) { 33120a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 3313525cd185SGustavo F. Padovan l2cap_resend_srejframe(chan, tx_seq); 33140a708f8fSGustavo F. Padovan return 0; 33150a708f8fSGustavo F. Padovan } 33160a708f8fSGustavo F. Padovan } 3317525cd185SGustavo F. Padovan l2cap_send_srejframe(chan, tx_seq); 33180a708f8fSGustavo F. Padovan } 33190a708f8fSGustavo F. Padovan } else { 33200a708f8fSGustavo F. Padovan expected_tx_seq_offset = 332142e5c802SGustavo F. Padovan (chan->expected_tx_seq - chan->buffer_seq) % 64; 33220a708f8fSGustavo F. Padovan if (expected_tx_seq_offset < 0) 33230a708f8fSGustavo F. Padovan expected_tx_seq_offset += 64; 33240a708f8fSGustavo F. Padovan 33250a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 33260a708f8fSGustavo F. Padovan if (tx_seq_offset < expected_tx_seq_offset) 33270a708f8fSGustavo F. Padovan goto drop; 33280a708f8fSGustavo F. Padovan 3329525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SREJ_SENT; 33300a708f8fSGustavo F. Padovan 33310a708f8fSGustavo F. Padovan BT_DBG("sk %p, Enter SREJ", sk); 33320a708f8fSGustavo F. Padovan 33330a708f8fSGustavo F. Padovan INIT_LIST_HEAD(SREJ_LIST(sk)); 333442e5c802SGustavo F. Padovan chan->buffer_seq_srej = chan->buffer_seq; 33350a708f8fSGustavo F. Padovan 33360a708f8fSGustavo F. Padovan __skb_queue_head_init(SREJ_QUEUE(sk)); 33370a708f8fSGustavo F. Padovan __skb_queue_head_init(BUSY_QUEUE(sk)); 333842e5c802SGustavo F. Padovan l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); 33390a708f8fSGustavo F. Padovan 3340525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_PBIT; 33410a708f8fSGustavo F. Padovan 3342525cd185SGustavo F. Padovan l2cap_send_srejframe(chan, tx_seq); 33430a708f8fSGustavo F. Padovan 33440a708f8fSGustavo F. Padovan del_timer(&pi->ack_timer); 33450a708f8fSGustavo F. Padovan } 33460a708f8fSGustavo F. Padovan return 0; 33470a708f8fSGustavo F. Padovan 33480a708f8fSGustavo F. Padovan expected: 334942e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 33500a708f8fSGustavo F. Padovan 3351525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { 33520a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 33530a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 33540a708f8fSGustavo F. Padovan __skb_queue_tail(SREJ_QUEUE(sk), skb); 33550a708f8fSGustavo F. Padovan return 0; 33560a708f8fSGustavo F. Padovan } 33570a708f8fSGustavo F. Padovan 3358525cd185SGustavo F. Padovan err = l2cap_push_rx_skb(chan, skb, rx_control); 33590a708f8fSGustavo F. Padovan if (err < 0) 33600a708f8fSGustavo F. Padovan return 0; 33610a708f8fSGustavo F. Padovan 33620a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 3363525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REJ_ACT) 3364525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REJ_ACT; 33650a708f8fSGustavo F. Padovan else 3366525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 33670a708f8fSGustavo F. Padovan } 33680a708f8fSGustavo F. Padovan 33690a708f8fSGustavo F. Padovan __mod_ack_timer(); 33700a708f8fSGustavo F. Padovan 3371*6a026610SGustavo F. Padovan chan->num_acked = (chan->num_acked + 1) % num_to_ack; 3372*6a026610SGustavo F. Padovan if (chan->num_acked == num_to_ack - 1) 3373525cd185SGustavo F. Padovan l2cap_send_ack(chan); 33740a708f8fSGustavo F. Padovan 33750a708f8fSGustavo F. Padovan return 0; 33760a708f8fSGustavo F. Padovan 33770a708f8fSGustavo F. Padovan drop: 33780a708f8fSGustavo F. Padovan kfree_skb(skb); 33790a708f8fSGustavo F. Padovan return 0; 33800a708f8fSGustavo F. Padovan } 33810a708f8fSGustavo F. Padovan 3382525cd185SGustavo F. Padovan static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) 33830a708f8fSGustavo F. Padovan { 3384525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 33850a708f8fSGustavo F. Padovan 33860a708f8fSGustavo F. Padovan BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), 33870a708f8fSGustavo F. Padovan rx_control); 33880a708f8fSGustavo F. Padovan 338942e5c802SGustavo F. Padovan chan->expected_ack_seq = __get_reqseq(rx_control); 339042e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 33910a708f8fSGustavo F. Padovan 33920a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 3393525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_FBIT; 3394525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { 3395525cd185SGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && 3396*6a026610SGustavo F. Padovan (chan->unacked_frames > 0)) 33970a708f8fSGustavo F. Padovan __mod_retrans_timer(); 33980a708f8fSGustavo F. Padovan 3399525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 3400525cd185SGustavo F. Padovan l2cap_send_srejtail(chan); 34010a708f8fSGustavo F. Padovan } else { 3402525cd185SGustavo F. Padovan l2cap_send_i_or_rr_or_rnr(chan); 34030a708f8fSGustavo F. Padovan } 34040a708f8fSGustavo F. Padovan 34050a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 3406525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 34070a708f8fSGustavo F. Padovan 3408525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REJ_ACT) 3409525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REJ_ACT; 34100a708f8fSGustavo F. Padovan else 3411525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 34120a708f8fSGustavo F. Padovan 34130a708f8fSGustavo F. Padovan } else { 3414525cd185SGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && 3415*6a026610SGustavo F. Padovan (chan->unacked_frames > 0)) 34160a708f8fSGustavo F. Padovan __mod_retrans_timer(); 34170a708f8fSGustavo F. Padovan 3418525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 3419525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_SREJ_SENT) 3420525cd185SGustavo F. Padovan l2cap_send_ack(chan); 34210a708f8fSGustavo F. Padovan else 3422525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 34230a708f8fSGustavo F. Padovan } 34240a708f8fSGustavo F. Padovan } 34250a708f8fSGustavo F. Padovan 3426525cd185SGustavo F. Padovan static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) 34270a708f8fSGustavo F. Padovan { 34280a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 34290a708f8fSGustavo F. Padovan 3430525cd185SGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); 34310a708f8fSGustavo F. Padovan 3432525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 34330a708f8fSGustavo F. Padovan 343442e5c802SGustavo F. Padovan chan->expected_ack_seq = tx_seq; 343542e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 34360a708f8fSGustavo F. Padovan 34370a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 3438525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_REJ_ACT) 3439525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REJ_ACT; 34400a708f8fSGustavo F. Padovan else 3441525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 34420a708f8fSGustavo F. Padovan } else { 3443525cd185SGustavo F. Padovan l2cap_retransmit_frames(chan); 34440a708f8fSGustavo F. Padovan 3445525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_WAIT_F) 3446525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_REJ_ACT; 34470a708f8fSGustavo F. Padovan } 34480a708f8fSGustavo F. Padovan } 3449525cd185SGustavo F. Padovan static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) 34500a708f8fSGustavo F. Padovan { 34510a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 34520a708f8fSGustavo F. Padovan 3453525cd185SGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); 34540a708f8fSGustavo F. Padovan 3455525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 34560a708f8fSGustavo F. Padovan 34570a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 345842e5c802SGustavo F. Padovan chan->expected_ack_seq = tx_seq; 345942e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 34600a708f8fSGustavo F. Padovan 3461525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_FBIT; 3462525cd185SGustavo F. Padovan l2cap_retransmit_one_frame(chan, tx_seq); 34630a708f8fSGustavo F. Padovan 3464525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 34650a708f8fSGustavo F. Padovan 3466525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_WAIT_F) { 3467*6a026610SGustavo F. Padovan chan->srej_save_reqseq = tx_seq; 3468525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SREJ_ACT; 34690a708f8fSGustavo F. Padovan } 34700a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 3471525cd185SGustavo F. Padovan if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) && 3472*6a026610SGustavo F. Padovan chan->srej_save_reqseq == tx_seq) 3473525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_SREJ_ACT; 34740a708f8fSGustavo F. Padovan else 3475525cd185SGustavo F. Padovan l2cap_retransmit_one_frame(chan, tx_seq); 34760a708f8fSGustavo F. Padovan } else { 3477525cd185SGustavo F. Padovan l2cap_retransmit_one_frame(chan, tx_seq); 3478525cd185SGustavo F. Padovan if (chan->conn_state & L2CAP_CONN_WAIT_F) { 3479*6a026610SGustavo F. Padovan chan->srej_save_reqseq = tx_seq; 3480525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SREJ_ACT; 34810a708f8fSGustavo F. Padovan } 34820a708f8fSGustavo F. Padovan } 34830a708f8fSGustavo F. Padovan } 34840a708f8fSGustavo F. Padovan 3485525cd185SGustavo F. Padovan static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) 34860a708f8fSGustavo F. Padovan { 3487525cd185SGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(chan->sk); 34880a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 34890a708f8fSGustavo F. Padovan 3490525cd185SGustavo F. Padovan BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); 34910a708f8fSGustavo F. Padovan 3492525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_REMOTE_BUSY; 349342e5c802SGustavo F. Padovan chan->expected_ack_seq = tx_seq; 349442e5c802SGustavo F. Padovan l2cap_drop_acked_frames(chan); 34950a708f8fSGustavo F. Padovan 34960a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 3497525cd185SGustavo F. Padovan chan->conn_state |= L2CAP_CONN_SEND_FBIT; 34980a708f8fSGustavo F. Padovan 3499525cd185SGustavo F. Padovan if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) { 35000a708f8fSGustavo F. Padovan del_timer(&pi->retrans_timer); 35010a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 3502525cd185SGustavo F. Padovan l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); 35030a708f8fSGustavo F. Padovan return; 35040a708f8fSGustavo F. Padovan } 35050a708f8fSGustavo F. Padovan 35060a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 3507525cd185SGustavo F. Padovan l2cap_send_srejtail(chan); 35080a708f8fSGustavo F. Padovan else 3509525cd185SGustavo F. Padovan l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); 35100a708f8fSGustavo F. Padovan } 35110a708f8fSGustavo F. Padovan 3512525cd185SGustavo F. Padovan static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) 35130a708f8fSGustavo F. Padovan { 3514525cd185SGustavo F. Padovan struct sock *sk = chan->sk; 3515525cd185SGustavo F. Padovan 3516525cd185SGustavo F. Padovan BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); 35170a708f8fSGustavo F. Padovan 35180a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 3519525cd185SGustavo F. Padovan chan->conn_state & L2CAP_CONN_WAIT_F) { 35200a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->monitor_timer); 3521*6a026610SGustavo F. Padovan if (chan->unacked_frames > 0) 35220a708f8fSGustavo F. Padovan __mod_retrans_timer(); 3523525cd185SGustavo F. Padovan chan->conn_state &= ~L2CAP_CONN_WAIT_F; 35240a708f8fSGustavo F. Padovan } 35250a708f8fSGustavo F. Padovan 35260a708f8fSGustavo F. Padovan switch (rx_control & L2CAP_CTRL_SUPERVISE) { 35270a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_READY: 3528525cd185SGustavo F. Padovan l2cap_data_channel_rrframe(chan, rx_control); 35290a708f8fSGustavo F. Padovan break; 35300a708f8fSGustavo F. Padovan 35310a708f8fSGustavo F. Padovan case L2CAP_SUPER_REJECT: 3532525cd185SGustavo F. Padovan l2cap_data_channel_rejframe(chan, rx_control); 35330a708f8fSGustavo F. Padovan break; 35340a708f8fSGustavo F. Padovan 35350a708f8fSGustavo F. Padovan case L2CAP_SUPER_SELECT_REJECT: 3536525cd185SGustavo F. Padovan l2cap_data_channel_srejframe(chan, rx_control); 35370a708f8fSGustavo F. Padovan break; 35380a708f8fSGustavo F. Padovan 35390a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_NOT_READY: 3540525cd185SGustavo F. Padovan l2cap_data_channel_rnrframe(chan, rx_control); 35410a708f8fSGustavo F. Padovan break; 35420a708f8fSGustavo F. Padovan } 35430a708f8fSGustavo F. Padovan 35440a708f8fSGustavo F. Padovan kfree_skb(skb); 35450a708f8fSGustavo F. Padovan return 0; 35460a708f8fSGustavo F. Padovan } 35470a708f8fSGustavo F. Padovan 35480a708f8fSGustavo F. Padovan static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) 35490a708f8fSGustavo F. Padovan { 3550525cd185SGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 35510a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 35520a708f8fSGustavo F. Padovan u16 control; 35530a708f8fSGustavo F. Padovan u8 req_seq; 35540a708f8fSGustavo F. Padovan int len, next_tx_seq_offset, req_seq_offset; 35550a708f8fSGustavo F. Padovan 35560a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 35570a708f8fSGustavo F. Padovan skb_pull(skb, 2); 35580a708f8fSGustavo F. Padovan len = skb->len; 35590a708f8fSGustavo F. Padovan 35600a708f8fSGustavo F. Padovan /* 35610a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 35620a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 35630a708f8fSGustavo F. Padovan * procedures and ask retransmission. 35640a708f8fSGustavo F. Padovan */ 35650a708f8fSGustavo F. Padovan if (l2cap_check_fcs(pi, skb)) 35660a708f8fSGustavo F. Padovan goto drop; 35670a708f8fSGustavo F. Padovan 35680a708f8fSGustavo F. Padovan if (__is_sar_start(control) && __is_iframe(control)) 35690a708f8fSGustavo F. Padovan len -= 2; 35700a708f8fSGustavo F. Padovan 35710a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) 35720a708f8fSGustavo F. Padovan len -= 2; 35730a708f8fSGustavo F. Padovan 35740a708f8fSGustavo F. Padovan if (len > pi->mps) { 35750a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35760a708f8fSGustavo F. Padovan goto drop; 35770a708f8fSGustavo F. Padovan } 35780a708f8fSGustavo F. Padovan 35790a708f8fSGustavo F. Padovan req_seq = __get_reqseq(control); 358042e5c802SGustavo F. Padovan req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; 35810a708f8fSGustavo F. Padovan if (req_seq_offset < 0) 35820a708f8fSGustavo F. Padovan req_seq_offset += 64; 35830a708f8fSGustavo F. Padovan 35840a708f8fSGustavo F. Padovan next_tx_seq_offset = 358542e5c802SGustavo F. Padovan (chan->next_tx_seq - chan->expected_ack_seq) % 64; 35860a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 35870a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 35880a708f8fSGustavo F. Padovan 35890a708f8fSGustavo F. Padovan /* check for invalid req-seq */ 35900a708f8fSGustavo F. Padovan if (req_seq_offset > next_tx_seq_offset) { 35910a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35920a708f8fSGustavo F. Padovan goto drop; 35930a708f8fSGustavo F. Padovan } 35940a708f8fSGustavo F. Padovan 35950a708f8fSGustavo F. Padovan if (__is_iframe(control)) { 35960a708f8fSGustavo F. Padovan if (len < 0) { 35970a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35980a708f8fSGustavo F. Padovan goto drop; 35990a708f8fSGustavo F. Padovan } 36000a708f8fSGustavo F. Padovan 3601525cd185SGustavo F. Padovan l2cap_data_channel_iframe(chan, control, skb); 36020a708f8fSGustavo F. Padovan } else { 36030a708f8fSGustavo F. Padovan if (len != 0) { 36040a708f8fSGustavo F. Padovan BT_ERR("%d", len); 36050a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 36060a708f8fSGustavo F. Padovan goto drop; 36070a708f8fSGustavo F. Padovan } 36080a708f8fSGustavo F. Padovan 3609525cd185SGustavo F. Padovan l2cap_data_channel_sframe(chan, control, skb); 36100a708f8fSGustavo F. Padovan } 36110a708f8fSGustavo F. Padovan 36120a708f8fSGustavo F. Padovan return 0; 36130a708f8fSGustavo F. Padovan 36140a708f8fSGustavo F. Padovan drop: 36150a708f8fSGustavo F. Padovan kfree_skb(skb); 36160a708f8fSGustavo F. Padovan return 0; 36170a708f8fSGustavo F. Padovan } 36180a708f8fSGustavo F. Padovan 36190a708f8fSGustavo F. Padovan static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) 36200a708f8fSGustavo F. Padovan { 362148454079SGustavo F. Padovan struct l2cap_chan *chan; 36220a708f8fSGustavo F. Padovan struct sock *sk; 36230a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi; 36240a708f8fSGustavo F. Padovan u16 control; 36250a708f8fSGustavo F. Padovan u8 tx_seq; 36260a708f8fSGustavo F. Padovan int len; 36270a708f8fSGustavo F. Padovan 3628baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 362948454079SGustavo F. Padovan if (!chan) { 36300a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 36310a708f8fSGustavo F. Padovan goto drop; 36320a708f8fSGustavo F. Padovan } 36330a708f8fSGustavo F. Padovan 363448454079SGustavo F. Padovan sk = chan->sk; 36350a708f8fSGustavo F. Padovan pi = l2cap_pi(sk); 36360a708f8fSGustavo F. Padovan 36370a708f8fSGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 36380a708f8fSGustavo F. Padovan 36390a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 36400a708f8fSGustavo F. Padovan goto drop; 36410a708f8fSGustavo F. Padovan 36420a708f8fSGustavo F. Padovan switch (pi->mode) { 36430a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 36440a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 36450a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 36460a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 36470a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 36480a708f8fSGustavo F. Padovan 36490a708f8fSGustavo F. Padovan if (pi->imtu < skb->len) 36500a708f8fSGustavo F. Padovan goto drop; 36510a708f8fSGustavo F. Padovan 36520a708f8fSGustavo F. Padovan if (!sock_queue_rcv_skb(sk, skb)) 36530a708f8fSGustavo F. Padovan goto done; 36540a708f8fSGustavo F. Padovan break; 36550a708f8fSGustavo F. Padovan 36560a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 36570a708f8fSGustavo F. Padovan if (!sock_owned_by_user(sk)) { 36580a708f8fSGustavo F. Padovan l2cap_ertm_data_rcv(sk, skb); 36590a708f8fSGustavo F. Padovan } else { 36600a708f8fSGustavo F. Padovan if (sk_add_backlog(sk, skb)) 36610a708f8fSGustavo F. Padovan goto drop; 36620a708f8fSGustavo F. Padovan } 36630a708f8fSGustavo F. Padovan 36640a708f8fSGustavo F. Padovan goto done; 36650a708f8fSGustavo F. Padovan 36660a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 36670a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 36680a708f8fSGustavo F. Padovan skb_pull(skb, 2); 36690a708f8fSGustavo F. Padovan len = skb->len; 36700a708f8fSGustavo F. Padovan 36710a708f8fSGustavo F. Padovan if (l2cap_check_fcs(pi, skb)) 36720a708f8fSGustavo F. Padovan goto drop; 36730a708f8fSGustavo F. Padovan 36740a708f8fSGustavo F. Padovan if (__is_sar_start(control)) 36750a708f8fSGustavo F. Padovan len -= 2; 36760a708f8fSGustavo F. Padovan 36770a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) 36780a708f8fSGustavo F. Padovan len -= 2; 36790a708f8fSGustavo F. Padovan 36800a708f8fSGustavo F. Padovan if (len > pi->mps || len < 0 || __is_sframe(control)) 36810a708f8fSGustavo F. Padovan goto drop; 36820a708f8fSGustavo F. Padovan 36830a708f8fSGustavo F. Padovan tx_seq = __get_txseq(control); 36840a708f8fSGustavo F. Padovan 368542e5c802SGustavo F. Padovan if (chan->expected_tx_seq == tx_seq) 368642e5c802SGustavo F. Padovan chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; 36870a708f8fSGustavo F. Padovan else 368842e5c802SGustavo F. Padovan chan->expected_tx_seq = (tx_seq + 1) % 64; 36890a708f8fSGustavo F. Padovan 3690525cd185SGustavo F. Padovan l2cap_streaming_reassembly_sdu(chan, skb, control); 36910a708f8fSGustavo F. Padovan 36920a708f8fSGustavo F. Padovan goto done; 36930a708f8fSGustavo F. Padovan 36940a708f8fSGustavo F. Padovan default: 36950a708f8fSGustavo F. Padovan BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); 36960a708f8fSGustavo F. Padovan break; 36970a708f8fSGustavo F. Padovan } 36980a708f8fSGustavo F. Padovan 36990a708f8fSGustavo F. Padovan drop: 37000a708f8fSGustavo F. Padovan kfree_skb(skb); 37010a708f8fSGustavo F. Padovan 37020a708f8fSGustavo F. Padovan done: 37030a708f8fSGustavo F. Padovan if (sk) 37040a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 37050a708f8fSGustavo F. Padovan 37060a708f8fSGustavo F. Padovan return 0; 37070a708f8fSGustavo F. Padovan } 37080a708f8fSGustavo F. Padovan 37090a708f8fSGustavo F. Padovan static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) 37100a708f8fSGustavo F. Padovan { 37110a708f8fSGustavo F. Padovan struct sock *sk; 37120a708f8fSGustavo F. Padovan 37130a708f8fSGustavo F. Padovan sk = l2cap_get_sock_by_psm(0, psm, conn->src); 37140a708f8fSGustavo F. Padovan if (!sk) 37150a708f8fSGustavo F. Padovan goto drop; 37160a708f8fSGustavo F. Padovan 37170a708f8fSGustavo F. Padovan bh_lock_sock(sk); 37180a708f8fSGustavo F. Padovan 37190a708f8fSGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 37200a708f8fSGustavo F. Padovan 37210a708f8fSGustavo F. Padovan if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) 37220a708f8fSGustavo F. Padovan goto drop; 37230a708f8fSGustavo F. Padovan 37240a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->imtu < skb->len) 37250a708f8fSGustavo F. Padovan goto drop; 37260a708f8fSGustavo F. Padovan 37270a708f8fSGustavo F. Padovan if (!sock_queue_rcv_skb(sk, skb)) 37280a708f8fSGustavo F. Padovan goto done; 37290a708f8fSGustavo F. Padovan 37300a708f8fSGustavo F. Padovan drop: 37310a708f8fSGustavo F. Padovan kfree_skb(skb); 37320a708f8fSGustavo F. Padovan 37330a708f8fSGustavo F. Padovan done: 37340a708f8fSGustavo F. Padovan if (sk) 37350a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 37360a708f8fSGustavo F. Padovan return 0; 37370a708f8fSGustavo F. Padovan } 37380a708f8fSGustavo F. Padovan 37390a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 37400a708f8fSGustavo F. Padovan { 37410a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 37420a708f8fSGustavo F. Padovan u16 cid, len; 37430a708f8fSGustavo F. Padovan __le16 psm; 37440a708f8fSGustavo F. Padovan 37450a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 37460a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 37470a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 37480a708f8fSGustavo F. Padovan 37490a708f8fSGustavo F. Padovan if (len != skb->len) { 37500a708f8fSGustavo F. Padovan kfree_skb(skb); 37510a708f8fSGustavo F. Padovan return; 37520a708f8fSGustavo F. Padovan } 37530a708f8fSGustavo F. Padovan 37540a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 37550a708f8fSGustavo F. Padovan 37560a708f8fSGustavo F. Padovan switch (cid) { 37573300d9a9SClaudio Takahasi case L2CAP_CID_LE_SIGNALING: 37580a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 37590a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 37600a708f8fSGustavo F. Padovan break; 37610a708f8fSGustavo F. Padovan 37620a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 37630a708f8fSGustavo F. Padovan psm = get_unaligned_le16(skb->data); 37640a708f8fSGustavo F. Padovan skb_pull(skb, 2); 37650a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 37660a708f8fSGustavo F. Padovan break; 37670a708f8fSGustavo F. Padovan 37680a708f8fSGustavo F. Padovan default: 37690a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 37700a708f8fSGustavo F. Padovan break; 37710a708f8fSGustavo F. Padovan } 37720a708f8fSGustavo F. Padovan } 37730a708f8fSGustavo F. Padovan 37740a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 37750a708f8fSGustavo F. Padovan 37760a708f8fSGustavo F. Padovan static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) 37770a708f8fSGustavo F. Padovan { 37780a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 37790a708f8fSGustavo F. Padovan register struct sock *sk; 37800a708f8fSGustavo F. Padovan struct hlist_node *node; 37810a708f8fSGustavo F. Padovan 37820a708f8fSGustavo F. Padovan if (type != ACL_LINK) 37830a708f8fSGustavo F. Padovan return -EINVAL; 37840a708f8fSGustavo F. Padovan 37850a708f8fSGustavo F. Padovan BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); 37860a708f8fSGustavo F. Padovan 37870a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 37880a708f8fSGustavo F. Padovan read_lock(&l2cap_sk_list.lock); 37890a708f8fSGustavo F. Padovan sk_for_each(sk, node, &l2cap_sk_list.head) { 37900a708f8fSGustavo F. Padovan if (sk->sk_state != BT_LISTEN) 37910a708f8fSGustavo F. Padovan continue; 37920a708f8fSGustavo F. Padovan 37930a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { 37940a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 37950a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->role_switch) 37960a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 37970a708f8fSGustavo F. Padovan exact++; 37980a708f8fSGustavo F. Padovan } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { 37990a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 38000a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->role_switch) 38010a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 38020a708f8fSGustavo F. Padovan } 38030a708f8fSGustavo F. Padovan } 38040a708f8fSGustavo F. Padovan read_unlock(&l2cap_sk_list.lock); 38050a708f8fSGustavo F. Padovan 38060a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 38070a708f8fSGustavo F. Padovan } 38080a708f8fSGustavo F. Padovan 38090a708f8fSGustavo F. Padovan static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 38100a708f8fSGustavo F. Padovan { 38110a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 38120a708f8fSGustavo F. Padovan 38130a708f8fSGustavo F. Padovan BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); 38140a708f8fSGustavo F. Padovan 3815acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 38160a708f8fSGustavo F. Padovan return -EINVAL; 38170a708f8fSGustavo F. Padovan 38180a708f8fSGustavo F. Padovan if (!status) { 38190a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, status); 38200a708f8fSGustavo F. Padovan if (conn) 38210a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 38220a708f8fSGustavo F. Padovan } else 38230a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(status)); 38240a708f8fSGustavo F. Padovan 38250a708f8fSGustavo F. Padovan return 0; 38260a708f8fSGustavo F. Padovan } 38270a708f8fSGustavo F. Padovan 38280a708f8fSGustavo F. Padovan static int l2cap_disconn_ind(struct hci_conn *hcon) 38290a708f8fSGustavo F. Padovan { 38300a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 38310a708f8fSGustavo F. Padovan 38320a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 38330a708f8fSGustavo F. Padovan 38340a708f8fSGustavo F. Padovan if (hcon->type != ACL_LINK || !conn) 38350a708f8fSGustavo F. Padovan return 0x13; 38360a708f8fSGustavo F. Padovan 38370a708f8fSGustavo F. Padovan return conn->disc_reason; 38380a708f8fSGustavo F. Padovan } 38390a708f8fSGustavo F. Padovan 38400a708f8fSGustavo F. Padovan static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 38410a708f8fSGustavo F. Padovan { 38420a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 38430a708f8fSGustavo F. Padovan 3844acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 38450a708f8fSGustavo F. Padovan return -EINVAL; 38460a708f8fSGustavo F. Padovan 38470a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(reason)); 38480a708f8fSGustavo F. Padovan 38490a708f8fSGustavo F. Padovan return 0; 38500a708f8fSGustavo F. Padovan } 38510a708f8fSGustavo F. Padovan 38520a708f8fSGustavo F. Padovan static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) 38530a708f8fSGustavo F. Padovan { 38540a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) 38550a708f8fSGustavo F. Padovan return; 38560a708f8fSGustavo F. Padovan 38570a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 38580a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { 38590a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 38600a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ * 5); 38610a708f8fSGustavo F. Padovan } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) 38620a708f8fSGustavo F. Padovan __l2cap_sock_close(sk, ECONNREFUSED); 38630a708f8fSGustavo F. Padovan } else { 38640a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) 38650a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 38660a708f8fSGustavo F. Padovan } 38670a708f8fSGustavo F. Padovan } 38680a708f8fSGustavo F. Padovan 38690a708f8fSGustavo F. Padovan static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 38700a708f8fSGustavo F. Padovan { 38710a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 387248454079SGustavo F. Padovan struct l2cap_chan *chan; 38730a708f8fSGustavo F. Padovan 38740a708f8fSGustavo F. Padovan if (!conn) 38750a708f8fSGustavo F. Padovan return 0; 38760a708f8fSGustavo F. Padovan 38770a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 38780a708f8fSGustavo F. Padovan 3879baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 38800a708f8fSGustavo F. Padovan 3881baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 388248454079SGustavo F. Padovan struct sock *sk = chan->sk; 3883baa7e1faSGustavo F. Padovan 38840a708f8fSGustavo F. Padovan bh_lock_sock(sk); 38850a708f8fSGustavo F. Padovan 38860a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { 38870a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 38880a708f8fSGustavo F. Padovan continue; 38890a708f8fSGustavo F. Padovan } 38900a708f8fSGustavo F. Padovan 38910a708f8fSGustavo F. Padovan if (!status && (sk->sk_state == BT_CONNECTED || 38920a708f8fSGustavo F. Padovan sk->sk_state == BT_CONFIG)) { 38930a708f8fSGustavo F. Padovan l2cap_check_encryption(sk, encrypt); 38940a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 38950a708f8fSGustavo F. Padovan continue; 38960a708f8fSGustavo F. Padovan } 38970a708f8fSGustavo F. Padovan 38980a708f8fSGustavo F. Padovan if (sk->sk_state == BT_CONNECT) { 38990a708f8fSGustavo F. Padovan if (!status) { 39000a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 39010a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 39020a708f8fSGustavo F. Padovan req.psm = l2cap_pi(sk)->psm; 39030a708f8fSGustavo F. Padovan 3904fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 39050a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 39060a708f8fSGustavo F. Padovan 3907fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 39080a708f8fSGustavo F. Padovan L2CAP_CONN_REQ, sizeof(req), &req); 39090a708f8fSGustavo F. Padovan } else { 39100a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 39110a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 10); 39120a708f8fSGustavo F. Padovan } 39130a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT2) { 39140a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 39150a708f8fSGustavo F. Padovan __u16 result; 39160a708f8fSGustavo F. Padovan 39170a708f8fSGustavo F. Padovan if (!status) { 39180a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 39190a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 39200a708f8fSGustavo F. Padovan } else { 39210a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 39220a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 10); 39230a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 39240a708f8fSGustavo F. Padovan } 39250a708f8fSGustavo F. Padovan 39260a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 39270a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 39280a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 39290a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 3930fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 3931fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 39320a708f8fSGustavo F. Padovan } 39330a708f8fSGustavo F. Padovan 39340a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 39350a708f8fSGustavo F. Padovan } 39360a708f8fSGustavo F. Padovan 3937baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 39380a708f8fSGustavo F. Padovan 39390a708f8fSGustavo F. Padovan return 0; 39400a708f8fSGustavo F. Padovan } 39410a708f8fSGustavo F. Padovan 39420a708f8fSGustavo F. Padovan static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 39430a708f8fSGustavo F. Padovan { 39440a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 39450a708f8fSGustavo F. Padovan 39460a708f8fSGustavo F. Padovan if (!conn) 39470a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 39480a708f8fSGustavo F. Padovan 39490a708f8fSGustavo F. Padovan if (!conn) 39500a708f8fSGustavo F. Padovan goto drop; 39510a708f8fSGustavo F. Padovan 39520a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 39530a708f8fSGustavo F. Padovan 39540a708f8fSGustavo F. Padovan if (!(flags & ACL_CONT)) { 39550a708f8fSGustavo F. Padovan struct l2cap_hdr *hdr; 395648454079SGustavo F. Padovan struct l2cap_chan *chan; 39570a708f8fSGustavo F. Padovan u16 cid; 39580a708f8fSGustavo F. Padovan int len; 39590a708f8fSGustavo F. Padovan 39600a708f8fSGustavo F. Padovan if (conn->rx_len) { 39610a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 39620a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 39630a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 39640a708f8fSGustavo F. Padovan conn->rx_len = 0; 39650a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39660a708f8fSGustavo F. Padovan } 39670a708f8fSGustavo F. Padovan 39680a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 39690a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 39700a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 39710a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39720a708f8fSGustavo F. Padovan goto drop; 39730a708f8fSGustavo F. Padovan } 39740a708f8fSGustavo F. Padovan 39750a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 39760a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 39770a708f8fSGustavo F. Padovan cid = __le16_to_cpu(hdr->cid); 39780a708f8fSGustavo F. Padovan 39790a708f8fSGustavo F. Padovan if (len == skb->len) { 39800a708f8fSGustavo F. Padovan /* Complete frame received */ 39810a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 39820a708f8fSGustavo F. Padovan return 0; 39830a708f8fSGustavo F. Padovan } 39840a708f8fSGustavo F. Padovan 39850a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 39860a708f8fSGustavo F. Padovan 39870a708f8fSGustavo F. Padovan if (skb->len > len) { 39880a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 39890a708f8fSGustavo F. Padovan skb->len, len); 39900a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39910a708f8fSGustavo F. Padovan goto drop; 39920a708f8fSGustavo F. Padovan } 39930a708f8fSGustavo F. Padovan 3994baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 39950a708f8fSGustavo F. Padovan 399648454079SGustavo F. Padovan if (chan && chan->sk) { 399748454079SGustavo F. Padovan struct sock *sk = chan->sk; 399848454079SGustavo F. Padovan 399948454079SGustavo F. Padovan if (l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { 400048454079SGustavo F. Padovan BT_ERR("Frame exceeding recv MTU (len %d, " 400148454079SGustavo F. Padovan "MTU %d)", len, 400248454079SGustavo F. Padovan l2cap_pi(sk)->imtu); 40030a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 40040a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 40050a708f8fSGustavo F. Padovan goto drop; 40060a708f8fSGustavo F. Padovan } 40070a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 400848454079SGustavo F. Padovan } 40090a708f8fSGustavo F. Padovan 40100a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 40110a708f8fSGustavo F. Padovan conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); 40120a708f8fSGustavo F. Padovan if (!conn->rx_skb) 40130a708f8fSGustavo F. Padovan goto drop; 40140a708f8fSGustavo F. Padovan 40150a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 40160a708f8fSGustavo F. Padovan skb->len); 40170a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 40180a708f8fSGustavo F. Padovan } else { 40190a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 40200a708f8fSGustavo F. Padovan 40210a708f8fSGustavo F. Padovan if (!conn->rx_len) { 40220a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 40230a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 40240a708f8fSGustavo F. Padovan goto drop; 40250a708f8fSGustavo F. Padovan } 40260a708f8fSGustavo F. Padovan 40270a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 40280a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 40290a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 40300a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 40310a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 40320a708f8fSGustavo F. Padovan conn->rx_len = 0; 40330a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 40340a708f8fSGustavo F. Padovan goto drop; 40350a708f8fSGustavo F. Padovan } 40360a708f8fSGustavo F. Padovan 40370a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 40380a708f8fSGustavo F. Padovan skb->len); 40390a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 40400a708f8fSGustavo F. Padovan 40410a708f8fSGustavo F. Padovan if (!conn->rx_len) { 40420a708f8fSGustavo F. Padovan /* Complete frame received */ 40430a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, conn->rx_skb); 40440a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 40450a708f8fSGustavo F. Padovan } 40460a708f8fSGustavo F. Padovan } 40470a708f8fSGustavo F. Padovan 40480a708f8fSGustavo F. Padovan drop: 40490a708f8fSGustavo F. Padovan kfree_skb(skb); 40500a708f8fSGustavo F. Padovan return 0; 40510a708f8fSGustavo F. Padovan } 40520a708f8fSGustavo F. Padovan 40530a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 40540a708f8fSGustavo F. Padovan { 40550a708f8fSGustavo F. Padovan struct sock *sk; 40560a708f8fSGustavo F. Padovan struct hlist_node *node; 40570a708f8fSGustavo F. Padovan 40580a708f8fSGustavo F. Padovan read_lock_bh(&l2cap_sk_list.lock); 40590a708f8fSGustavo F. Padovan 40600a708f8fSGustavo F. Padovan sk_for_each(sk, node, &l2cap_sk_list.head) { 40610a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 40620a708f8fSGustavo F. Padovan 4063903d343eSGustavo F. Padovan seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 40640a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->src), 40650a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->dst), 40660a708f8fSGustavo F. Padovan sk->sk_state, __le16_to_cpu(pi->psm), 40670a708f8fSGustavo F. Padovan pi->scid, pi->dcid, 4068903d343eSGustavo F. Padovan pi->imtu, pi->omtu, pi->sec_level, 4069903d343eSGustavo F. Padovan pi->mode); 40700a708f8fSGustavo F. Padovan } 40710a708f8fSGustavo F. Padovan 40720a708f8fSGustavo F. Padovan read_unlock_bh(&l2cap_sk_list.lock); 40730a708f8fSGustavo F. Padovan 40740a708f8fSGustavo F. Padovan return 0; 40750a708f8fSGustavo F. Padovan } 40760a708f8fSGustavo F. Padovan 40770a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 40780a708f8fSGustavo F. Padovan { 40790a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 40800a708f8fSGustavo F. Padovan } 40810a708f8fSGustavo F. Padovan 40820a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 40830a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 40840a708f8fSGustavo F. Padovan .read = seq_read, 40850a708f8fSGustavo F. Padovan .llseek = seq_lseek, 40860a708f8fSGustavo F. Padovan .release = single_release, 40870a708f8fSGustavo F. Padovan }; 40880a708f8fSGustavo F. Padovan 40890a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 40900a708f8fSGustavo F. Padovan 40910a708f8fSGustavo F. Padovan static struct hci_proto l2cap_hci_proto = { 40920a708f8fSGustavo F. Padovan .name = "L2CAP", 40930a708f8fSGustavo F. Padovan .id = HCI_PROTO_L2CAP, 40940a708f8fSGustavo F. Padovan .connect_ind = l2cap_connect_ind, 40950a708f8fSGustavo F. Padovan .connect_cfm = l2cap_connect_cfm, 40960a708f8fSGustavo F. Padovan .disconn_ind = l2cap_disconn_ind, 40970a708f8fSGustavo F. Padovan .disconn_cfm = l2cap_disconn_cfm, 40980a708f8fSGustavo F. Padovan .security_cfm = l2cap_security_cfm, 40990a708f8fSGustavo F. Padovan .recv_acldata = l2cap_recv_acldata 41000a708f8fSGustavo F. Padovan }; 41010a708f8fSGustavo F. Padovan 410264274518SGustavo F. Padovan int __init l2cap_init(void) 41030a708f8fSGustavo F. Padovan { 41040a708f8fSGustavo F. Padovan int err; 41050a708f8fSGustavo F. Padovan 4106bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 41070a708f8fSGustavo F. Padovan if (err < 0) 41080a708f8fSGustavo F. Padovan return err; 41090a708f8fSGustavo F. Padovan 41100a708f8fSGustavo F. Padovan _busy_wq = create_singlethread_workqueue("l2cap"); 41110a708f8fSGustavo F. Padovan if (!_busy_wq) { 4112bb58f747SGustavo F. Padovan err = -ENOMEM; 41130a708f8fSGustavo F. Padovan goto error; 41140a708f8fSGustavo F. Padovan } 41150a708f8fSGustavo F. Padovan 41160a708f8fSGustavo F. Padovan err = hci_register_proto(&l2cap_hci_proto); 41170a708f8fSGustavo F. Padovan if (err < 0) { 41180a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol registration failed"); 41190a708f8fSGustavo F. Padovan bt_sock_unregister(BTPROTO_L2CAP); 41200a708f8fSGustavo F. Padovan goto error; 41210a708f8fSGustavo F. Padovan } 41220a708f8fSGustavo F. Padovan 41230a708f8fSGustavo F. Padovan if (bt_debugfs) { 41240a708f8fSGustavo F. Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, 41250a708f8fSGustavo F. Padovan bt_debugfs, NULL, &l2cap_debugfs_fops); 41260a708f8fSGustavo F. Padovan if (!l2cap_debugfs) 41270a708f8fSGustavo F. Padovan BT_ERR("Failed to create L2CAP debug file"); 41280a708f8fSGustavo F. Padovan } 41290a708f8fSGustavo F. Padovan 41300a708f8fSGustavo F. Padovan return 0; 41310a708f8fSGustavo F. Padovan 41320a708f8fSGustavo F. Padovan error: 41330a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 4134bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 41350a708f8fSGustavo F. Padovan return err; 41360a708f8fSGustavo F. Padovan } 41370a708f8fSGustavo F. Padovan 413864274518SGustavo F. Padovan void l2cap_exit(void) 41390a708f8fSGustavo F. Padovan { 41400a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 41410a708f8fSGustavo F. Padovan 41420a708f8fSGustavo F. Padovan flush_workqueue(_busy_wq); 41430a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 41440a708f8fSGustavo F. Padovan 41450a708f8fSGustavo F. Padovan if (hci_unregister_proto(&l2cap_hci_proto) < 0) 41460a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol unregistration failed"); 41470a708f8fSGustavo F. Padovan 4148bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 41490a708f8fSGustavo F. Padovan } 41500a708f8fSGustavo F. Padovan 41510a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 41520a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 4153