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 3430a708f8fSGustavo F. Padovan static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) 3440a708f8fSGustavo F. Padovan { 3450a708f8fSGustavo F. Padovan struct sk_buff *skb; 3460a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 3470a708f8fSGustavo F. Padovan struct l2cap_conn *conn = pi->conn; 3480a708f8fSGustavo F. Padovan struct sock *sk = (struct sock *)pi; 3490a708f8fSGustavo F. Padovan int count, hlen = L2CAP_HDR_SIZE + 2; 3500a708f8fSGustavo F. Padovan u8 flags; 3510a708f8fSGustavo F. Padovan 3520a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 3530a708f8fSGustavo F. Padovan return; 3540a708f8fSGustavo F. Padovan 3550a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) 3560a708f8fSGustavo F. Padovan hlen += 2; 3570a708f8fSGustavo F. Padovan 3580a708f8fSGustavo F. Padovan BT_DBG("pi %p, control 0x%2.2x", pi, control); 3590a708f8fSGustavo F. Padovan 3600a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, hlen); 3610a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FRAME_TYPE; 3620a708f8fSGustavo F. Padovan 3630a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { 3640a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 3650a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; 3660a708f8fSGustavo F. Padovan } 3670a708f8fSGustavo F. Padovan 3680a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { 3690a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_POLL; 3700a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; 3710a708f8fSGustavo F. Padovan } 3720a708f8fSGustavo F. Padovan 3730a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 3740a708f8fSGustavo F. Padovan if (!skb) 3750a708f8fSGustavo F. Padovan return; 3760a708f8fSGustavo F. Padovan 3770a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 3780a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 3790a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(pi->dcid); 3800a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 3810a708f8fSGustavo F. Padovan 3820a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 3830a708f8fSGustavo F. Padovan u16 fcs = crc16(0, (u8 *)lh, count - 2); 3840a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb_put(skb, 2)); 3850a708f8fSGustavo F. Padovan } 3860a708f8fSGustavo F. Padovan 3870a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 3880a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 3890a708f8fSGustavo F. Padovan else 3900a708f8fSGustavo F. Padovan flags = ACL_START; 3910a708f8fSGustavo F. Padovan 3920a708f8fSGustavo F. Padovan hci_send_acl(pi->conn->hcon, skb, flags); 3930a708f8fSGustavo F. Padovan } 3940a708f8fSGustavo F. Padovan 3950a708f8fSGustavo F. Padovan static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) 3960a708f8fSGustavo F. Padovan { 3970a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { 3980a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 3990a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_RNR_SENT; 4000a708f8fSGustavo F. Padovan } else 4010a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 4020a708f8fSGustavo F. Padovan 4030a708f8fSGustavo F. Padovan control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 4040a708f8fSGustavo F. Padovan 4050a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 4060a708f8fSGustavo F. Padovan } 4070a708f8fSGustavo F. Padovan 4080a708f8fSGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct sock *sk) 4090a708f8fSGustavo F. Padovan { 4100a708f8fSGustavo F. Padovan return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); 4110a708f8fSGustavo F. Padovan } 4120a708f8fSGustavo F. Padovan 413fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 4140a708f8fSGustavo F. Padovan { 415fc7f8a7eSGustavo F. Padovan struct sock *sk = chan->sk; 4160a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 4170a708f8fSGustavo F. Padovan 4180a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 4190a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 4200a708f8fSGustavo F. Padovan return; 4210a708f8fSGustavo F. Padovan 4220a708f8fSGustavo F. Padovan if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { 4230a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 4240a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 4250a708f8fSGustavo F. Padovan req.psm = l2cap_pi(sk)->psm; 4260a708f8fSGustavo F. Padovan 427fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 4280a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 4290a708f8fSGustavo F. Padovan 430fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 431fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 4320a708f8fSGustavo F. Padovan } 4330a708f8fSGustavo F. Padovan } else { 4340a708f8fSGustavo F. Padovan struct l2cap_info_req req; 4350a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 4360a708f8fSGustavo F. Padovan 4370a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 4380a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 4390a708f8fSGustavo F. Padovan 4400a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 4410a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 4420a708f8fSGustavo F. Padovan 4430a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 4440a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 4450a708f8fSGustavo F. Padovan } 4460a708f8fSGustavo F. Padovan } 4470a708f8fSGustavo F. Padovan 4480a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 4490a708f8fSGustavo F. Padovan { 4500a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 4510a708f8fSGustavo F. Padovan if (!disable_ertm) 4520a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 4530a708f8fSGustavo F. Padovan 4540a708f8fSGustavo F. Padovan switch (mode) { 4550a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 4560a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 4570a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 4580a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 4590a708f8fSGustavo F. Padovan default: 4600a708f8fSGustavo F. Padovan return 0x00; 4610a708f8fSGustavo F. Padovan } 4620a708f8fSGustavo F. Padovan } 4630a708f8fSGustavo F. Padovan 4646de0702bSGustavo F. Padovan void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) 4650a708f8fSGustavo F. Padovan { 4660a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 4670a708f8fSGustavo F. Padovan 4680a708f8fSGustavo F. Padovan if (!conn) 4690a708f8fSGustavo F. Padovan return; 4700a708f8fSGustavo F. Padovan 4710a708f8fSGustavo F. Padovan skb_queue_purge(TX_QUEUE(sk)); 4720a708f8fSGustavo F. Padovan 4730a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { 4740a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->retrans_timer); 4750a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->monitor_timer); 4760a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->ack_timer); 4770a708f8fSGustavo F. Padovan } 4780a708f8fSGustavo F. Padovan 4790a708f8fSGustavo F. Padovan req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); 4800a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 4810a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 4820a708f8fSGustavo F. Padovan L2CAP_DISCONN_REQ, sizeof(req), &req); 4830a708f8fSGustavo F. Padovan 4840a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 4850a708f8fSGustavo F. Padovan sk->sk_err = err; 4860a708f8fSGustavo F. Padovan } 4870a708f8fSGustavo F. Padovan 4880a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 4890a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 4900a708f8fSGustavo F. Padovan { 491820ffdb3SGustavo F. Padovan struct l2cap_chan *chan, *tmp; 4920a708f8fSGustavo F. Padovan 4930a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 4940a708f8fSGustavo F. Padovan 495baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 4960a708f8fSGustavo F. Padovan 497820ffdb3SGustavo F. Padovan list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 49848454079SGustavo F. Padovan struct sock *sk = chan->sk; 499baa7e1faSGustavo F. Padovan 5000a708f8fSGustavo F. Padovan bh_lock_sock(sk); 5010a708f8fSGustavo F. Padovan 5020a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && 5030a708f8fSGustavo F. Padovan sk->sk_type != SOCK_STREAM) { 5040a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5050a708f8fSGustavo F. Padovan continue; 5060a708f8fSGustavo F. Padovan } 5070a708f8fSGustavo F. Padovan 5080a708f8fSGustavo F. Padovan if (sk->sk_state == BT_CONNECT) { 5090a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 5100a708f8fSGustavo F. Padovan 5110a708f8fSGustavo F. Padovan if (!l2cap_check_security(sk) || 5120a708f8fSGustavo F. Padovan !__l2cap_no_conn_pending(sk)) { 5130a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5140a708f8fSGustavo F. Padovan continue; 5150a708f8fSGustavo F. Padovan } 5160a708f8fSGustavo F. Padovan 5170a708f8fSGustavo F. Padovan if (!l2cap_mode_supported(l2cap_pi(sk)->mode, 5180a708f8fSGustavo F. Padovan conn->feat_mask) 5190a708f8fSGustavo F. Padovan && l2cap_pi(sk)->conf_state & 5200a708f8fSGustavo F. Padovan L2CAP_CONF_STATE2_DEVICE) { 521820ffdb3SGustavo F. Padovan /* __l2cap_sock_close() calls list_del(chan) 522820ffdb3SGustavo F. Padovan * so release the lock */ 523820ffdb3SGustavo F. Padovan read_unlock_bh(&conn->chan_lock); 524820ffdb3SGustavo F. Padovan __l2cap_sock_close(sk, ECONNRESET); 525820ffdb3SGustavo F. Padovan read_lock_bh(&conn->chan_lock); 5260a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5270a708f8fSGustavo F. Padovan continue; 5280a708f8fSGustavo F. Padovan } 5290a708f8fSGustavo F. Padovan 5300a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 5310a708f8fSGustavo F. Padovan req.psm = l2cap_pi(sk)->psm; 5320a708f8fSGustavo F. Padovan 533fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 5340a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 5350a708f8fSGustavo F. Padovan 536fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, 537fc7f8a7eSGustavo F. Padovan sizeof(req), &req); 5380a708f8fSGustavo F. Padovan 5390a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT2) { 5400a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 5410a708f8fSGustavo F. Padovan char buf[128]; 5420a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 5430a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 5440a708f8fSGustavo F. Padovan 5450a708f8fSGustavo F. Padovan if (l2cap_check_security(sk)) { 5460a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 5470a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 5480a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 5490a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 5500a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 5510a708f8fSGustavo F. Padovan 5520a708f8fSGustavo F. Padovan } else { 5530a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 5540a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 5550a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 5560a708f8fSGustavo F. Padovan } 5570a708f8fSGustavo F. Padovan } else { 5580a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_PEND); 5590a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 5600a708f8fSGustavo F. Padovan } 5610a708f8fSGustavo F. Padovan 562fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 563fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 5640a708f8fSGustavo F. Padovan 5650a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || 5660a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 5670a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5680a708f8fSGustavo F. Padovan continue; 5690a708f8fSGustavo F. Padovan } 5700a708f8fSGustavo F. Padovan 5710a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 5720a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 57373ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 57473ffa904SGustavo F. Padovan chan->num_conf_req++; 5750a708f8fSGustavo F. Padovan } 5760a708f8fSGustavo F. Padovan 5770a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 5780a708f8fSGustavo F. Padovan } 5790a708f8fSGustavo F. Padovan 580baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 5810a708f8fSGustavo F. Padovan } 5820a708f8fSGustavo F. Padovan 583b62f328bSVille Tervo /* Find socket with cid and source bdaddr. 584b62f328bSVille Tervo * Returns closest match, locked. 585b62f328bSVille Tervo */ 586b62f328bSVille Tervo static struct sock *l2cap_get_sock_by_scid(int state, __le16 cid, bdaddr_t *src) 587b62f328bSVille Tervo { 588b62f328bSVille Tervo struct sock *s, *sk = NULL, *sk1 = NULL; 589b62f328bSVille Tervo struct hlist_node *node; 590b62f328bSVille Tervo 591b62f328bSVille Tervo read_lock(&l2cap_sk_list.lock); 592b62f328bSVille Tervo 593b62f328bSVille Tervo sk_for_each(sk, node, &l2cap_sk_list.head) { 594b62f328bSVille Tervo if (state && sk->sk_state != state) 595b62f328bSVille Tervo continue; 596b62f328bSVille Tervo 597b62f328bSVille Tervo if (l2cap_pi(sk)->scid == cid) { 598b62f328bSVille Tervo /* Exact match. */ 599b62f328bSVille Tervo if (!bacmp(&bt_sk(sk)->src, src)) 600b62f328bSVille Tervo break; 601b62f328bSVille Tervo 602b62f328bSVille Tervo /* Closest match */ 603b62f328bSVille Tervo if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 604b62f328bSVille Tervo sk1 = sk; 605b62f328bSVille Tervo } 606b62f328bSVille Tervo } 607b62f328bSVille Tervo s = node ? sk : sk1; 608b62f328bSVille Tervo if (s) 609b62f328bSVille Tervo bh_lock_sock(s); 610b62f328bSVille Tervo read_unlock(&l2cap_sk_list.lock); 611b62f328bSVille Tervo 612b62f328bSVille Tervo return s; 613b62f328bSVille Tervo } 614b62f328bSVille Tervo 615b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 616b62f328bSVille Tervo { 617b62f328bSVille Tervo struct sock *parent, *uninitialized_var(sk); 61848454079SGustavo F. Padovan struct l2cap_chan *chan; 619b62f328bSVille Tervo 620b62f328bSVille Tervo BT_DBG(""); 621b62f328bSVille Tervo 622b62f328bSVille Tervo /* Check if we have socket listening on cid */ 623b62f328bSVille Tervo parent = l2cap_get_sock_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, 624b62f328bSVille Tervo conn->src); 625b62f328bSVille Tervo if (!parent) 626b62f328bSVille Tervo return; 627b62f328bSVille Tervo 628b62f328bSVille Tervo /* Check for backlog size */ 629b62f328bSVille Tervo if (sk_acceptq_is_full(parent)) { 630b62f328bSVille Tervo BT_DBG("backlog full %d", parent->sk_ack_backlog); 631b62f328bSVille Tervo goto clean; 632b62f328bSVille Tervo } 633b62f328bSVille Tervo 634b62f328bSVille Tervo sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); 635b62f328bSVille Tervo if (!sk) 636b62f328bSVille Tervo goto clean; 637b62f328bSVille Tervo 63848454079SGustavo F. Padovan chan = l2cap_chan_alloc(sk); 63948454079SGustavo F. Padovan if (!chan) { 64048454079SGustavo F. Padovan l2cap_sock_kill(sk); 64148454079SGustavo F. Padovan goto clean; 64248454079SGustavo F. Padovan } 64348454079SGustavo F. Padovan 644baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 645b62f328bSVille Tervo 646b62f328bSVille Tervo hci_conn_hold(conn->hcon); 647b62f328bSVille Tervo 648b62f328bSVille Tervo l2cap_sock_init(sk, parent); 649baa7e1faSGustavo F. Padovan 650b62f328bSVille Tervo bacpy(&bt_sk(sk)->src, conn->src); 651b62f328bSVille Tervo bacpy(&bt_sk(sk)->dst, conn->dst); 652b62f328bSVille Tervo 653d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 654d1010240SGustavo F. Padovan 65548454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 65648454079SGustavo F. Padovan 65748454079SGustavo F. Padovan l2cap_pi(sk)->chan = chan; 658b62f328bSVille Tervo 659b62f328bSVille Tervo l2cap_sock_set_timer(sk, sk->sk_sndtimeo); 660b62f328bSVille Tervo 661b62f328bSVille Tervo sk->sk_state = BT_CONNECTED; 662b62f328bSVille Tervo parent->sk_data_ready(parent, 0); 663b62f328bSVille Tervo 664baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 665b62f328bSVille Tervo 666b62f328bSVille Tervo clean: 667b62f328bSVille Tervo bh_unlock_sock(parent); 668b62f328bSVille Tervo } 669b62f328bSVille Tervo 6700a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 6710a708f8fSGustavo F. Padovan { 67248454079SGustavo F. Padovan struct l2cap_chan *chan; 6730a708f8fSGustavo F. Padovan 6740a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 6750a708f8fSGustavo F. Padovan 676b62f328bSVille Tervo if (!conn->hcon->out && conn->hcon->type == LE_LINK) 677b62f328bSVille Tervo l2cap_le_conn_ready(conn); 678b62f328bSVille Tervo 679baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 6800a708f8fSGustavo F. Padovan 681baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 68248454079SGustavo F. Padovan struct sock *sk = chan->sk; 683baa7e1faSGustavo F. Padovan 6840a708f8fSGustavo F. Padovan bh_lock_sock(sk); 6850a708f8fSGustavo F. Padovan 686acd7d370SVille Tervo if (conn->hcon->type == LE_LINK) { 687acd7d370SVille Tervo l2cap_sock_clear_timer(sk); 688acd7d370SVille Tervo sk->sk_state = BT_CONNECTED; 689acd7d370SVille Tervo sk->sk_state_change(sk); 690acd7d370SVille Tervo } 691acd7d370SVille Tervo 6920a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && 6930a708f8fSGustavo F. Padovan sk->sk_type != SOCK_STREAM) { 6940a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 6950a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 6960a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 6970a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT) 698fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 6990a708f8fSGustavo F. Padovan 7000a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7010a708f8fSGustavo F. Padovan } 7020a708f8fSGustavo F. Padovan 703baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 7040a708f8fSGustavo F. Padovan } 7050a708f8fSGustavo F. Padovan 7060a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 7070a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 7080a708f8fSGustavo F. Padovan { 70948454079SGustavo F. Padovan struct l2cap_chan *chan; 7100a708f8fSGustavo F. Padovan 7110a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 7120a708f8fSGustavo F. Padovan 713baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 7140a708f8fSGustavo F. Padovan 715baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 71648454079SGustavo F. Padovan struct sock *sk = chan->sk; 717baa7e1faSGustavo F. Padovan 7180a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->force_reliable) 7190a708f8fSGustavo F. Padovan sk->sk_err = err; 7200a708f8fSGustavo F. Padovan } 7210a708f8fSGustavo F. Padovan 722baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 7230a708f8fSGustavo F. Padovan } 7240a708f8fSGustavo F. Padovan 7250a708f8fSGustavo F. Padovan static void l2cap_info_timeout(unsigned long arg) 7260a708f8fSGustavo F. Padovan { 7270a708f8fSGustavo F. Padovan struct l2cap_conn *conn = (void *) arg; 7280a708f8fSGustavo F. Padovan 7290a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 7300a708f8fSGustavo F. Padovan conn->info_ident = 0; 7310a708f8fSGustavo F. Padovan 7320a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 7330a708f8fSGustavo F. Padovan } 7340a708f8fSGustavo F. Padovan 7350a708f8fSGustavo F. Padovan static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) 7360a708f8fSGustavo F. Padovan { 7370a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 7380a708f8fSGustavo F. Padovan 7390a708f8fSGustavo F. Padovan if (conn || status) 7400a708f8fSGustavo F. Padovan return conn; 7410a708f8fSGustavo F. Padovan 7420a708f8fSGustavo F. Padovan conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); 7430a708f8fSGustavo F. Padovan if (!conn) 7440a708f8fSGustavo F. Padovan return NULL; 7450a708f8fSGustavo F. Padovan 7460a708f8fSGustavo F. Padovan hcon->l2cap_data = conn; 7470a708f8fSGustavo F. Padovan conn->hcon = hcon; 7480a708f8fSGustavo F. Padovan 7490a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p", hcon, conn); 7500a708f8fSGustavo F. Padovan 751acd7d370SVille Tervo if (hcon->hdev->le_mtu && hcon->type == LE_LINK) 752acd7d370SVille Tervo conn->mtu = hcon->hdev->le_mtu; 753acd7d370SVille Tervo else 7540a708f8fSGustavo F. Padovan conn->mtu = hcon->hdev->acl_mtu; 755acd7d370SVille Tervo 7560a708f8fSGustavo F. Padovan conn->src = &hcon->hdev->bdaddr; 7570a708f8fSGustavo F. Padovan conn->dst = &hcon->dst; 7580a708f8fSGustavo F. Padovan 7590a708f8fSGustavo F. Padovan conn->feat_mask = 0; 7600a708f8fSGustavo F. Padovan 7610a708f8fSGustavo F. Padovan spin_lock_init(&conn->lock); 762baa7e1faSGustavo F. Padovan rwlock_init(&conn->chan_lock); 763baa7e1faSGustavo F. Padovan 764baa7e1faSGustavo F. Padovan INIT_LIST_HEAD(&conn->chan_l); 7650a708f8fSGustavo F. Padovan 766b62f328bSVille Tervo if (hcon->type != LE_LINK) 7670a708f8fSGustavo F. Padovan setup_timer(&conn->info_timer, l2cap_info_timeout, 7680a708f8fSGustavo F. Padovan (unsigned long) conn); 7690a708f8fSGustavo F. Padovan 7700a708f8fSGustavo F. Padovan conn->disc_reason = 0x13; 7710a708f8fSGustavo F. Padovan 7720a708f8fSGustavo F. Padovan return conn; 7730a708f8fSGustavo F. Padovan } 7740a708f8fSGustavo F. Padovan 7750a708f8fSGustavo F. Padovan static void l2cap_conn_del(struct hci_conn *hcon, int err) 7760a708f8fSGustavo F. Padovan { 7770a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 778baa7e1faSGustavo F. Padovan struct l2cap_chan *chan, *l; 7790a708f8fSGustavo F. Padovan struct sock *sk; 7800a708f8fSGustavo F. Padovan 7810a708f8fSGustavo F. Padovan if (!conn) 7820a708f8fSGustavo F. Padovan return; 7830a708f8fSGustavo F. Padovan 7840a708f8fSGustavo F. Padovan BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 7850a708f8fSGustavo F. Padovan 7860a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 7870a708f8fSGustavo F. Padovan 7880a708f8fSGustavo F. Padovan /* Kill channels */ 789baa7e1faSGustavo F. Padovan list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 79048454079SGustavo F. Padovan sk = chan->sk; 7910a708f8fSGustavo F. Padovan bh_lock_sock(sk); 79248454079SGustavo F. Padovan l2cap_chan_del(chan, err); 7930a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 7940a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 7950a708f8fSGustavo F. Padovan } 7960a708f8fSGustavo F. Padovan 7970a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 7980a708f8fSGustavo F. Padovan del_timer_sync(&conn->info_timer); 7990a708f8fSGustavo F. Padovan 8000a708f8fSGustavo F. Padovan hcon->l2cap_data = NULL; 8010a708f8fSGustavo F. Padovan kfree(conn); 8020a708f8fSGustavo F. Padovan } 8030a708f8fSGustavo F. Padovan 80448454079SGustavo F. Padovan static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 8050a708f8fSGustavo F. Padovan { 806baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 80748454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 808baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 8090a708f8fSGustavo F. Padovan } 8100a708f8fSGustavo F. Padovan 8110a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 8120a708f8fSGustavo F. Padovan 8130a708f8fSGustavo F. Padovan /* Find socket with psm and source bdaddr. 8140a708f8fSGustavo F. Padovan * Returns closest match. 8150a708f8fSGustavo F. Padovan */ 8160a708f8fSGustavo F. Padovan static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) 8170a708f8fSGustavo F. Padovan { 8180a708f8fSGustavo F. Padovan struct sock *sk = NULL, *sk1 = NULL; 8190a708f8fSGustavo F. Padovan struct hlist_node *node; 8200a708f8fSGustavo F. Padovan 8210a708f8fSGustavo F. Padovan read_lock(&l2cap_sk_list.lock); 8220a708f8fSGustavo F. Padovan 8230a708f8fSGustavo F. Padovan sk_for_each(sk, node, &l2cap_sk_list.head) { 8240a708f8fSGustavo F. Padovan if (state && sk->sk_state != state) 8250a708f8fSGustavo F. Padovan continue; 8260a708f8fSGustavo F. Padovan 8270a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->psm == psm) { 8280a708f8fSGustavo F. Padovan /* Exact match. */ 8290a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, src)) 8300a708f8fSGustavo F. Padovan break; 8310a708f8fSGustavo F. Padovan 8320a708f8fSGustavo F. Padovan /* Closest match */ 8330a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) 8340a708f8fSGustavo F. Padovan sk1 = sk; 8350a708f8fSGustavo F. Padovan } 8360a708f8fSGustavo F. Padovan } 8370a708f8fSGustavo F. Padovan 8380a708f8fSGustavo F. Padovan read_unlock(&l2cap_sk_list.lock); 8390a708f8fSGustavo F. Padovan 8400a708f8fSGustavo F. Padovan return node ? sk : sk1; 8410a708f8fSGustavo F. Padovan } 8420a708f8fSGustavo F. Padovan 8434e34c50bSGustavo F. Padovan int l2cap_do_connect(struct sock *sk) 8440a708f8fSGustavo F. Padovan { 8450a708f8fSGustavo F. Padovan bdaddr_t *src = &bt_sk(sk)->src; 8460a708f8fSGustavo F. Padovan bdaddr_t *dst = &bt_sk(sk)->dst; 8470a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 84848454079SGustavo F. Padovan struct l2cap_chan *chan; 8490a708f8fSGustavo F. Padovan struct hci_conn *hcon; 8500a708f8fSGustavo F. Padovan struct hci_dev *hdev; 8510a708f8fSGustavo F. Padovan __u8 auth_type; 8520a708f8fSGustavo F. Padovan int err; 8530a708f8fSGustavo F. Padovan 8540a708f8fSGustavo F. Padovan BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), 8550a708f8fSGustavo F. Padovan l2cap_pi(sk)->psm); 8560a708f8fSGustavo F. Padovan 8570a708f8fSGustavo F. Padovan hdev = hci_get_route(dst, src); 8580a708f8fSGustavo F. Padovan if (!hdev) 8590a708f8fSGustavo F. Padovan return -EHOSTUNREACH; 8600a708f8fSGustavo F. Padovan 8610a708f8fSGustavo F. Padovan hci_dev_lock_bh(hdev); 8620a708f8fSGustavo F. Padovan 8630a708f8fSGustavo F. Padovan auth_type = l2cap_get_auth_type(sk); 8640a708f8fSGustavo F. Padovan 865acd7d370SVille Tervo if (l2cap_pi(sk)->dcid == L2CAP_CID_LE_DATA) 866acd7d370SVille Tervo hcon = hci_connect(hdev, LE_LINK, dst, 867acd7d370SVille Tervo l2cap_pi(sk)->sec_level, auth_type); 868acd7d370SVille Tervo else 8690a708f8fSGustavo F. Padovan hcon = hci_connect(hdev, ACL_LINK, dst, 8700a708f8fSGustavo F. Padovan l2cap_pi(sk)->sec_level, auth_type); 871acd7d370SVille Tervo 87230e76272SVille Tervo if (IS_ERR(hcon)) { 87330e76272SVille Tervo err = PTR_ERR(hcon); 8740a708f8fSGustavo F. Padovan goto done; 87530e76272SVille Tervo } 8760a708f8fSGustavo F. Padovan 8770a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 8780a708f8fSGustavo F. Padovan if (!conn) { 8790a708f8fSGustavo F. Padovan hci_conn_put(hcon); 88030e76272SVille Tervo err = -ENOMEM; 8810a708f8fSGustavo F. Padovan goto done; 8820a708f8fSGustavo F. Padovan } 8830a708f8fSGustavo F. Padovan 88448454079SGustavo F. Padovan chan = l2cap_chan_alloc(sk); 88548454079SGustavo F. Padovan if (!chan) { 88648454079SGustavo F. Padovan hci_conn_put(hcon); 88748454079SGustavo F. Padovan err = -ENOMEM; 88848454079SGustavo F. Padovan goto done; 88948454079SGustavo F. Padovan } 89048454079SGustavo F. Padovan 8910a708f8fSGustavo F. Padovan /* Update source addr of the socket */ 8920a708f8fSGustavo F. Padovan bacpy(src, conn->src); 8930a708f8fSGustavo F. Padovan 89448454079SGustavo F. Padovan l2cap_chan_add(conn, chan); 89548454079SGustavo F. Padovan 89648454079SGustavo F. Padovan l2cap_pi(sk)->chan = chan; 8970a708f8fSGustavo F. Padovan 8980a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT; 8990a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, sk->sk_sndtimeo); 9000a708f8fSGustavo F. Padovan 9010a708f8fSGustavo F. Padovan if (hcon->state == BT_CONNECTED) { 9020a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && 9030a708f8fSGustavo F. Padovan sk->sk_type != SOCK_STREAM) { 9040a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 9050a708f8fSGustavo F. Padovan if (l2cap_check_security(sk)) 9060a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 9070a708f8fSGustavo F. Padovan } else 908fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 9090a708f8fSGustavo F. Padovan } 9100a708f8fSGustavo F. Padovan 91130e76272SVille Tervo err = 0; 91230e76272SVille Tervo 9130a708f8fSGustavo F. Padovan done: 9140a708f8fSGustavo F. Padovan hci_dev_unlock_bh(hdev); 9150a708f8fSGustavo F. Padovan hci_dev_put(hdev); 9160a708f8fSGustavo F. Padovan return err; 9170a708f8fSGustavo F. Padovan } 9180a708f8fSGustavo F. Padovan 919dcba0dbaSGustavo F. Padovan int __l2cap_wait_ack(struct sock *sk) 9200a708f8fSGustavo F. Padovan { 9210a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 9220a708f8fSGustavo F. Padovan int err = 0; 9230a708f8fSGustavo F. Padovan int timeo = HZ/5; 9240a708f8fSGustavo F. Padovan 9250a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 9260a708f8fSGustavo F. Padovan while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { 9270a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 9280a708f8fSGustavo F. Padovan 9290a708f8fSGustavo F. Padovan if (!timeo) 9300a708f8fSGustavo F. Padovan timeo = HZ/5; 9310a708f8fSGustavo F. Padovan 9320a708f8fSGustavo F. Padovan if (signal_pending(current)) { 9330a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 9340a708f8fSGustavo F. Padovan break; 9350a708f8fSGustavo F. Padovan } 9360a708f8fSGustavo F. Padovan 9370a708f8fSGustavo F. Padovan release_sock(sk); 9380a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 9390a708f8fSGustavo F. Padovan lock_sock(sk); 9400a708f8fSGustavo F. Padovan 9410a708f8fSGustavo F. Padovan err = sock_error(sk); 9420a708f8fSGustavo F. Padovan if (err) 9430a708f8fSGustavo F. Padovan break; 9440a708f8fSGustavo F. Padovan } 9450a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 9460a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 9470a708f8fSGustavo F. Padovan return err; 9480a708f8fSGustavo F. Padovan } 9490a708f8fSGustavo F. Padovan 9500a708f8fSGustavo F. Padovan static void l2cap_monitor_timeout(unsigned long arg) 9510a708f8fSGustavo F. Padovan { 9520a708f8fSGustavo F. Padovan struct sock *sk = (void *) arg; 9530a708f8fSGustavo F. Padovan 9540a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 9550a708f8fSGustavo F. Padovan 9560a708f8fSGustavo F. Padovan bh_lock_sock(sk); 9570a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { 9580a708f8fSGustavo F. Padovan l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); 9590a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9600a708f8fSGustavo F. Padovan return; 9610a708f8fSGustavo F. Padovan } 9620a708f8fSGustavo F. Padovan 9630a708f8fSGustavo F. Padovan l2cap_pi(sk)->retry_count++; 9640a708f8fSGustavo F. Padovan __mod_monitor_timer(); 9650a708f8fSGustavo F. Padovan 9660a708f8fSGustavo F. Padovan l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); 9670a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9680a708f8fSGustavo F. Padovan } 9690a708f8fSGustavo F. Padovan 9700a708f8fSGustavo F. Padovan static void l2cap_retrans_timeout(unsigned long arg) 9710a708f8fSGustavo F. Padovan { 9720a708f8fSGustavo F. Padovan struct sock *sk = (void *) arg; 9730a708f8fSGustavo F. Padovan 9740a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 9750a708f8fSGustavo F. Padovan 9760a708f8fSGustavo F. Padovan bh_lock_sock(sk); 9770a708f8fSGustavo F. Padovan l2cap_pi(sk)->retry_count = 1; 9780a708f8fSGustavo F. Padovan __mod_monitor_timer(); 9790a708f8fSGustavo F. Padovan 9800a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; 9810a708f8fSGustavo F. Padovan 9820a708f8fSGustavo F. Padovan l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); 9830a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 9840a708f8fSGustavo F. Padovan } 9850a708f8fSGustavo F. Padovan 9860a708f8fSGustavo F. Padovan static void l2cap_drop_acked_frames(struct sock *sk) 9870a708f8fSGustavo F. Padovan { 9880a708f8fSGustavo F. Padovan struct sk_buff *skb; 9890a708f8fSGustavo F. Padovan 9900a708f8fSGustavo F. Padovan while ((skb = skb_peek(TX_QUEUE(sk))) && 9910a708f8fSGustavo F. Padovan l2cap_pi(sk)->unacked_frames) { 9920a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) 9930a708f8fSGustavo F. Padovan break; 9940a708f8fSGustavo F. Padovan 9950a708f8fSGustavo F. Padovan skb = skb_dequeue(TX_QUEUE(sk)); 9960a708f8fSGustavo F. Padovan kfree_skb(skb); 9970a708f8fSGustavo F. Padovan 9980a708f8fSGustavo F. Padovan l2cap_pi(sk)->unacked_frames--; 9990a708f8fSGustavo F. Padovan } 10000a708f8fSGustavo F. Padovan 10010a708f8fSGustavo F. Padovan if (!l2cap_pi(sk)->unacked_frames) 10020a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->retrans_timer); 10030a708f8fSGustavo F. Padovan } 10040a708f8fSGustavo F. Padovan 1005fd83ccdbSGustavo F. Padovan void l2cap_do_send(struct sock *sk, struct sk_buff *skb) 10060a708f8fSGustavo F. Padovan { 10070a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10080a708f8fSGustavo F. Padovan struct hci_conn *hcon = pi->conn->hcon; 10090a708f8fSGustavo F. Padovan u16 flags; 10100a708f8fSGustavo F. Padovan 10110a708f8fSGustavo F. Padovan BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); 10120a708f8fSGustavo F. Padovan 10130a708f8fSGustavo F. Padovan if (!pi->flushable && lmp_no_flush_capable(hcon->hdev)) 10140a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 10150a708f8fSGustavo F. Padovan else 10160a708f8fSGustavo F. Padovan flags = ACL_START; 10170a708f8fSGustavo F. Padovan 10180a708f8fSGustavo F. Padovan hci_send_acl(hcon, skb, flags); 10190a708f8fSGustavo F. Padovan } 10200a708f8fSGustavo F. Padovan 1021fd83ccdbSGustavo F. Padovan void l2cap_streaming_send(struct sock *sk) 10220a708f8fSGustavo F. Padovan { 10230a708f8fSGustavo F. Padovan struct sk_buff *skb; 10240a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10250a708f8fSGustavo F. Padovan u16 control, fcs; 10260a708f8fSGustavo F. Padovan 10270a708f8fSGustavo F. Padovan while ((skb = skb_dequeue(TX_QUEUE(sk)))) { 10280a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); 10290a708f8fSGustavo F. Padovan control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; 10300a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); 10310a708f8fSGustavo F. Padovan 10320a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 10330a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, skb->len - 2); 10340a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + skb->len - 2); 10350a708f8fSGustavo F. Padovan } 10360a708f8fSGustavo F. Padovan 10370a708f8fSGustavo F. Padovan l2cap_do_send(sk, skb); 10380a708f8fSGustavo F. Padovan 10390a708f8fSGustavo F. Padovan pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; 10400a708f8fSGustavo F. Padovan } 10410a708f8fSGustavo F. Padovan } 10420a708f8fSGustavo F. Padovan 10430a708f8fSGustavo F. Padovan static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) 10440a708f8fSGustavo F. Padovan { 10450a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10460a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 10470a708f8fSGustavo F. Padovan u16 control, fcs; 10480a708f8fSGustavo F. Padovan 10490a708f8fSGustavo F. Padovan skb = skb_peek(TX_QUEUE(sk)); 10500a708f8fSGustavo F. Padovan if (!skb) 10510a708f8fSGustavo F. Padovan return; 10520a708f8fSGustavo F. Padovan 10530a708f8fSGustavo F. Padovan do { 10540a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq == tx_seq) 10550a708f8fSGustavo F. Padovan break; 10560a708f8fSGustavo F. Padovan 10570a708f8fSGustavo F. Padovan if (skb_queue_is_last(TX_QUEUE(sk), skb)) 10580a708f8fSGustavo F. Padovan return; 10590a708f8fSGustavo F. Padovan 10600a708f8fSGustavo F. Padovan } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); 10610a708f8fSGustavo F. Padovan 10620a708f8fSGustavo F. Padovan if (pi->remote_max_tx && 10630a708f8fSGustavo F. Padovan bt_cb(skb)->retries == pi->remote_max_tx) { 10640a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); 10650a708f8fSGustavo F. Padovan return; 10660a708f8fSGustavo F. Padovan } 10670a708f8fSGustavo F. Padovan 10680a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 10690a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 10700a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 10710a708f8fSGustavo F. Padovan 10720a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { 10730a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 10740a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; 10750a708f8fSGustavo F. Padovan } 10760a708f8fSGustavo F. Padovan 10770a708f8fSGustavo F. Padovan control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 10780a708f8fSGustavo F. Padovan | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 10790a708f8fSGustavo F. Padovan 10800a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 10810a708f8fSGustavo F. Padovan 10820a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 10830a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); 10840a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); 10850a708f8fSGustavo F. Padovan } 10860a708f8fSGustavo F. Padovan 10870a708f8fSGustavo F. Padovan l2cap_do_send(sk, tx_skb); 10880a708f8fSGustavo F. Padovan } 10890a708f8fSGustavo F. Padovan 1090fd83ccdbSGustavo F. Padovan int l2cap_ertm_send(struct sock *sk) 10910a708f8fSGustavo F. Padovan { 10920a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 10930a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 10940a708f8fSGustavo F. Padovan u16 control, fcs; 10950a708f8fSGustavo F. Padovan int nsent = 0; 10960a708f8fSGustavo F. Padovan 10970a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 10980a708f8fSGustavo F. Padovan return -ENOTCONN; 10990a708f8fSGustavo F. Padovan 11000a708f8fSGustavo F. Padovan while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { 11010a708f8fSGustavo F. Padovan 11020a708f8fSGustavo F. Padovan if (pi->remote_max_tx && 11030a708f8fSGustavo F. Padovan bt_cb(skb)->retries == pi->remote_max_tx) { 11040a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); 11050a708f8fSGustavo F. Padovan break; 11060a708f8fSGustavo F. Padovan } 11070a708f8fSGustavo F. Padovan 11080a708f8fSGustavo F. Padovan tx_skb = skb_clone(skb, GFP_ATOMIC); 11090a708f8fSGustavo F. Padovan 11100a708f8fSGustavo F. Padovan bt_cb(skb)->retries++; 11110a708f8fSGustavo F. Padovan 11120a708f8fSGustavo F. Padovan control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); 11130a708f8fSGustavo F. Padovan control &= L2CAP_CTRL_SAR; 11140a708f8fSGustavo F. Padovan 11150a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { 11160a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 11170a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; 11180a708f8fSGustavo F. Padovan } 11190a708f8fSGustavo F. Padovan control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) 11200a708f8fSGustavo F. Padovan | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); 11210a708f8fSGustavo F. Padovan put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); 11220a708f8fSGustavo F. Padovan 11230a708f8fSGustavo F. Padovan 11240a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 11250a708f8fSGustavo F. Padovan fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); 11260a708f8fSGustavo F. Padovan put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); 11270a708f8fSGustavo F. Padovan } 11280a708f8fSGustavo F. Padovan 11290a708f8fSGustavo F. Padovan l2cap_do_send(sk, tx_skb); 11300a708f8fSGustavo F. Padovan 11310a708f8fSGustavo F. Padovan __mod_retrans_timer(); 11320a708f8fSGustavo F. Padovan 11330a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = pi->next_tx_seq; 11340a708f8fSGustavo F. Padovan pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; 11350a708f8fSGustavo F. Padovan 113623e9fde2SSuraj Sumangala if (bt_cb(skb)->retries == 1) 11370a708f8fSGustavo F. Padovan pi->unacked_frames++; 113823e9fde2SSuraj Sumangala 11390a708f8fSGustavo F. Padovan pi->frames_sent++; 11400a708f8fSGustavo F. Padovan 11410a708f8fSGustavo F. Padovan if (skb_queue_is_last(TX_QUEUE(sk), skb)) 11420a708f8fSGustavo F. Padovan sk->sk_send_head = NULL; 11430a708f8fSGustavo F. Padovan else 11440a708f8fSGustavo F. Padovan sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); 11450a708f8fSGustavo F. Padovan 11460a708f8fSGustavo F. Padovan nsent++; 11470a708f8fSGustavo F. Padovan } 11480a708f8fSGustavo F. Padovan 11490a708f8fSGustavo F. Padovan return nsent; 11500a708f8fSGustavo F. Padovan } 11510a708f8fSGustavo F. Padovan 11520a708f8fSGustavo F. Padovan static int l2cap_retransmit_frames(struct sock *sk) 11530a708f8fSGustavo F. Padovan { 11540a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 11550a708f8fSGustavo F. Padovan int ret; 11560a708f8fSGustavo F. Padovan 11570a708f8fSGustavo F. Padovan if (!skb_queue_empty(TX_QUEUE(sk))) 11580a708f8fSGustavo F. Padovan sk->sk_send_head = TX_QUEUE(sk)->next; 11590a708f8fSGustavo F. Padovan 11600a708f8fSGustavo F. Padovan pi->next_tx_seq = pi->expected_ack_seq; 11610a708f8fSGustavo F. Padovan ret = l2cap_ertm_send(sk); 11620a708f8fSGustavo F. Padovan return ret; 11630a708f8fSGustavo F. Padovan } 11640a708f8fSGustavo F. Padovan 11650a708f8fSGustavo F. Padovan static void l2cap_send_ack(struct l2cap_pinfo *pi) 11660a708f8fSGustavo F. Padovan { 11670a708f8fSGustavo F. Padovan struct sock *sk = (struct sock *)pi; 11680a708f8fSGustavo F. Padovan u16 control = 0; 11690a708f8fSGustavo F. Padovan 11700a708f8fSGustavo F. Padovan control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 11710a708f8fSGustavo F. Padovan 11720a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { 11730a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 11740a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_RNR_SENT; 11750a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 11760a708f8fSGustavo F. Padovan return; 11770a708f8fSGustavo F. Padovan } 11780a708f8fSGustavo F. Padovan 11790a708f8fSGustavo F. Padovan if (l2cap_ertm_send(sk) > 0) 11800a708f8fSGustavo F. Padovan return; 11810a708f8fSGustavo F. Padovan 11820a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 11830a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 11840a708f8fSGustavo F. Padovan } 11850a708f8fSGustavo F. Padovan 11860a708f8fSGustavo F. Padovan static void l2cap_send_srejtail(struct sock *sk) 11870a708f8fSGustavo F. Padovan { 11880a708f8fSGustavo F. Padovan struct srej_list *tail; 11890a708f8fSGustavo F. Padovan u16 control; 11900a708f8fSGustavo F. Padovan 11910a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 11920a708f8fSGustavo F. Padovan control |= L2CAP_CTRL_FINAL; 11930a708f8fSGustavo F. Padovan 11940a708f8fSGustavo F. Padovan tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); 11950a708f8fSGustavo F. Padovan control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 11960a708f8fSGustavo F. Padovan 11970a708f8fSGustavo F. Padovan l2cap_send_sframe(l2cap_pi(sk), control); 11980a708f8fSGustavo F. Padovan } 11990a708f8fSGustavo F. Padovan 12000a708f8fSGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) 12010a708f8fSGustavo F. Padovan { 12020a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12030a708f8fSGustavo F. Padovan struct sk_buff **frag; 12040a708f8fSGustavo F. Padovan int err, sent = 0; 12050a708f8fSGustavo F. Padovan 12060a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) 12070a708f8fSGustavo F. Padovan return -EFAULT; 12080a708f8fSGustavo F. Padovan 12090a708f8fSGustavo F. Padovan sent += count; 12100a708f8fSGustavo F. Padovan len -= count; 12110a708f8fSGustavo F. Padovan 12120a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 12130a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 12140a708f8fSGustavo F. Padovan while (len) { 12150a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 12160a708f8fSGustavo F. Padovan 12170a708f8fSGustavo F. Padovan *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); 12180a708f8fSGustavo F. Padovan if (!*frag) 12190a708f8fSGustavo F. Padovan return err; 12200a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) 12210a708f8fSGustavo F. Padovan return -EFAULT; 12220a708f8fSGustavo F. Padovan 12230a708f8fSGustavo F. Padovan sent += count; 12240a708f8fSGustavo F. Padovan len -= count; 12250a708f8fSGustavo F. Padovan 12260a708f8fSGustavo F. Padovan frag = &(*frag)->next; 12270a708f8fSGustavo F. Padovan } 12280a708f8fSGustavo F. Padovan 12290a708f8fSGustavo F. Padovan return sent; 12300a708f8fSGustavo F. Padovan } 12310a708f8fSGustavo F. Padovan 1232fd83ccdbSGustavo F. Padovan struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) 12330a708f8fSGustavo F. Padovan { 12340a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12350a708f8fSGustavo F. Padovan struct sk_buff *skb; 12360a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 12370a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 12380a708f8fSGustavo F. Padovan 12390a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 12400a708f8fSGustavo F. Padovan 12410a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 12420a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 12430a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 12440a708f8fSGustavo F. Padovan if (!skb) 12450a708f8fSGustavo F. Padovan return ERR_PTR(err); 12460a708f8fSGustavo F. Padovan 12470a708f8fSGustavo F. Padovan /* Create L2CAP header */ 12480a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 12490a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); 12500a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 12510a708f8fSGustavo F. Padovan put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); 12520a708f8fSGustavo F. Padovan 12530a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 12540a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 12550a708f8fSGustavo F. Padovan kfree_skb(skb); 12560a708f8fSGustavo F. Padovan return ERR_PTR(err); 12570a708f8fSGustavo F. Padovan } 12580a708f8fSGustavo F. Padovan return skb; 12590a708f8fSGustavo F. Padovan } 12600a708f8fSGustavo F. Padovan 1261fd83ccdbSGustavo F. Padovan struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) 12620a708f8fSGustavo F. Padovan { 12630a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12640a708f8fSGustavo F. Padovan struct sk_buff *skb; 12650a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE; 12660a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 12670a708f8fSGustavo F. Padovan 12680a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 12690a708f8fSGustavo F. Padovan 12700a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 12710a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 12720a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 12730a708f8fSGustavo F. Padovan if (!skb) 12740a708f8fSGustavo F. Padovan return ERR_PTR(err); 12750a708f8fSGustavo F. Padovan 12760a708f8fSGustavo F. Padovan /* Create L2CAP header */ 12770a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 12780a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); 12790a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 12800a708f8fSGustavo F. Padovan 12810a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 12820a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 12830a708f8fSGustavo F. Padovan kfree_skb(skb); 12840a708f8fSGustavo F. Padovan return ERR_PTR(err); 12850a708f8fSGustavo F. Padovan } 12860a708f8fSGustavo F. Padovan return skb; 12870a708f8fSGustavo F. Padovan } 12880a708f8fSGustavo F. Padovan 1289fd83ccdbSGustavo F. Padovan struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) 12900a708f8fSGustavo F. Padovan { 12910a708f8fSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 12920a708f8fSGustavo F. Padovan struct sk_buff *skb; 12930a708f8fSGustavo F. Padovan int err, count, hlen = L2CAP_HDR_SIZE + 2; 12940a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 12950a708f8fSGustavo F. Padovan 12960a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d", sk, (int)len); 12970a708f8fSGustavo F. Padovan 12980a708f8fSGustavo F. Padovan if (!conn) 12990a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 13000a708f8fSGustavo F. Padovan 13010a708f8fSGustavo F. Padovan if (sdulen) 13020a708f8fSGustavo F. Padovan hlen += 2; 13030a708f8fSGustavo F. Padovan 13040a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) 13050a708f8fSGustavo F. Padovan hlen += 2; 13060a708f8fSGustavo F. Padovan 13070a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 13080a708f8fSGustavo F. Padovan skb = bt_skb_send_alloc(sk, count + hlen, 13090a708f8fSGustavo F. Padovan msg->msg_flags & MSG_DONTWAIT, &err); 13100a708f8fSGustavo F. Padovan if (!skb) 13110a708f8fSGustavo F. Padovan return ERR_PTR(err); 13120a708f8fSGustavo F. Padovan 13130a708f8fSGustavo F. Padovan /* Create L2CAP header */ 13140a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 13150a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); 13160a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 13170a708f8fSGustavo F. Padovan put_unaligned_le16(control, skb_put(skb, 2)); 13180a708f8fSGustavo F. Padovan if (sdulen) 13190a708f8fSGustavo F. Padovan put_unaligned_le16(sdulen, skb_put(skb, 2)); 13200a708f8fSGustavo F. Padovan 13210a708f8fSGustavo F. Padovan err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); 13220a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 13230a708f8fSGustavo F. Padovan kfree_skb(skb); 13240a708f8fSGustavo F. Padovan return ERR_PTR(err); 13250a708f8fSGustavo F. Padovan } 13260a708f8fSGustavo F. Padovan 13270a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) 13280a708f8fSGustavo F. Padovan put_unaligned_le16(0, skb_put(skb, 2)); 13290a708f8fSGustavo F. Padovan 13300a708f8fSGustavo F. Padovan bt_cb(skb)->retries = 0; 13310a708f8fSGustavo F. Padovan return skb; 13320a708f8fSGustavo F. Padovan } 13330a708f8fSGustavo F. Padovan 1334fd83ccdbSGustavo F. Padovan int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) 13350a708f8fSGustavo F. Padovan { 13360a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 13370a708f8fSGustavo F. Padovan struct sk_buff *skb; 13380a708f8fSGustavo F. Padovan struct sk_buff_head sar_queue; 13390a708f8fSGustavo F. Padovan u16 control; 13400a708f8fSGustavo F. Padovan size_t size = 0; 13410a708f8fSGustavo F. Padovan 13420a708f8fSGustavo F. Padovan skb_queue_head_init(&sar_queue); 13430a708f8fSGustavo F. Padovan control = L2CAP_SDU_START; 13440a708f8fSGustavo F. Padovan skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); 13450a708f8fSGustavo F. Padovan if (IS_ERR(skb)) 13460a708f8fSGustavo F. Padovan return PTR_ERR(skb); 13470a708f8fSGustavo F. Padovan 13480a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 13490a708f8fSGustavo F. Padovan len -= pi->remote_mps; 13500a708f8fSGustavo F. Padovan size += pi->remote_mps; 13510a708f8fSGustavo F. Padovan 13520a708f8fSGustavo F. Padovan while (len > 0) { 13530a708f8fSGustavo F. Padovan size_t buflen; 13540a708f8fSGustavo F. Padovan 13550a708f8fSGustavo F. Padovan if (len > pi->remote_mps) { 13560a708f8fSGustavo F. Padovan control = L2CAP_SDU_CONTINUE; 13570a708f8fSGustavo F. Padovan buflen = pi->remote_mps; 13580a708f8fSGustavo F. Padovan } else { 13590a708f8fSGustavo F. Padovan control = L2CAP_SDU_END; 13600a708f8fSGustavo F. Padovan buflen = len; 13610a708f8fSGustavo F. Padovan } 13620a708f8fSGustavo F. Padovan 13630a708f8fSGustavo F. Padovan skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); 13640a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 13650a708f8fSGustavo F. Padovan skb_queue_purge(&sar_queue); 13660a708f8fSGustavo F. Padovan return PTR_ERR(skb); 13670a708f8fSGustavo F. Padovan } 13680a708f8fSGustavo F. Padovan 13690a708f8fSGustavo F. Padovan __skb_queue_tail(&sar_queue, skb); 13700a708f8fSGustavo F. Padovan len -= buflen; 13710a708f8fSGustavo F. Padovan size += buflen; 13720a708f8fSGustavo F. Padovan } 13730a708f8fSGustavo F. Padovan skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); 13740a708f8fSGustavo F. Padovan if (sk->sk_send_head == NULL) 13750a708f8fSGustavo F. Padovan sk->sk_send_head = sar_queue.next; 13760a708f8fSGustavo F. Padovan 13770a708f8fSGustavo F. Padovan return size; 13780a708f8fSGustavo F. Padovan } 13790a708f8fSGustavo F. Padovan 13800a708f8fSGustavo F. Padovan static void l2cap_chan_ready(struct sock *sk) 13810a708f8fSGustavo F. Padovan { 13820a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 13830a708f8fSGustavo F. Padovan 13840a708f8fSGustavo F. Padovan BT_DBG("sk %p, parent %p", sk, parent); 13850a708f8fSGustavo F. Padovan 13860a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state = 0; 13870a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 13880a708f8fSGustavo F. Padovan 13890a708f8fSGustavo F. Padovan if (!parent) { 13900a708f8fSGustavo F. Padovan /* Outgoing channel. 13910a708f8fSGustavo F. Padovan * Wake up socket sleeping on connect. 13920a708f8fSGustavo F. Padovan */ 13930a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 13940a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 13950a708f8fSGustavo F. Padovan } else { 13960a708f8fSGustavo F. Padovan /* Incoming channel. 13970a708f8fSGustavo F. Padovan * Wake up socket sleeping on accept. 13980a708f8fSGustavo F. Padovan */ 13990a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 14000a708f8fSGustavo F. Padovan } 14010a708f8fSGustavo F. Padovan } 14020a708f8fSGustavo F. Padovan 14030a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 14040a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 14050a708f8fSGustavo F. Padovan { 14060a708f8fSGustavo F. Padovan struct sk_buff *nskb; 140748454079SGustavo F. Padovan struct l2cap_chan *chan; 14080a708f8fSGustavo F. Padovan 14090a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 14100a708f8fSGustavo F. Padovan 1411baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 1412baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 141348454079SGustavo F. Padovan struct sock *sk = chan->sk; 14140a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_RAW) 14150a708f8fSGustavo F. Padovan continue; 14160a708f8fSGustavo F. Padovan 14170a708f8fSGustavo F. Padovan /* Don't send frame to the socket it came from */ 14180a708f8fSGustavo F. Padovan if (skb->sk == sk) 14190a708f8fSGustavo F. Padovan continue; 14200a708f8fSGustavo F. Padovan nskb = skb_clone(skb, GFP_ATOMIC); 14210a708f8fSGustavo F. Padovan if (!nskb) 14220a708f8fSGustavo F. Padovan continue; 14230a708f8fSGustavo F. Padovan 14240a708f8fSGustavo F. Padovan if (sock_queue_rcv_skb(sk, nskb)) 14250a708f8fSGustavo F. Padovan kfree_skb(nskb); 14260a708f8fSGustavo F. Padovan } 1427baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 14280a708f8fSGustavo F. Padovan } 14290a708f8fSGustavo F. Padovan 14300a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 14310a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 14320a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data) 14330a708f8fSGustavo F. Padovan { 14340a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 14350a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 14360a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 14370a708f8fSGustavo F. Padovan int len, count; 14380a708f8fSGustavo F. Padovan 14390a708f8fSGustavo F. Padovan BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", 14400a708f8fSGustavo F. Padovan conn, code, ident, dlen); 14410a708f8fSGustavo F. Padovan 14420a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 14430a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 14440a708f8fSGustavo F. Padovan 14450a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 14460a708f8fSGustavo F. Padovan if (!skb) 14470a708f8fSGustavo F. Padovan return NULL; 14480a708f8fSGustavo F. Padovan 14490a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 14500a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 14513300d9a9SClaudio Takahasi 14523300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 14533300d9a9SClaudio Takahasi lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); 14543300d9a9SClaudio Takahasi else 14550a708f8fSGustavo F. Padovan lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); 14560a708f8fSGustavo F. Padovan 14570a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 14580a708f8fSGustavo F. Padovan cmd->code = code; 14590a708f8fSGustavo F. Padovan cmd->ident = ident; 14600a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 14610a708f8fSGustavo F. Padovan 14620a708f8fSGustavo F. Padovan if (dlen) { 14630a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 14640a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 14650a708f8fSGustavo F. Padovan data += count; 14660a708f8fSGustavo F. Padovan } 14670a708f8fSGustavo F. Padovan 14680a708f8fSGustavo F. Padovan len -= skb->len; 14690a708f8fSGustavo F. Padovan 14700a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 14710a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 14720a708f8fSGustavo F. Padovan while (len) { 14730a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 14740a708f8fSGustavo F. Padovan 14750a708f8fSGustavo F. Padovan *frag = bt_skb_alloc(count, GFP_ATOMIC); 14760a708f8fSGustavo F. Padovan if (!*frag) 14770a708f8fSGustavo F. Padovan goto fail; 14780a708f8fSGustavo F. Padovan 14790a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 14800a708f8fSGustavo F. Padovan 14810a708f8fSGustavo F. Padovan len -= count; 14820a708f8fSGustavo F. Padovan data += count; 14830a708f8fSGustavo F. Padovan 14840a708f8fSGustavo F. Padovan frag = &(*frag)->next; 14850a708f8fSGustavo F. Padovan } 14860a708f8fSGustavo F. Padovan 14870a708f8fSGustavo F. Padovan return skb; 14880a708f8fSGustavo F. Padovan 14890a708f8fSGustavo F. Padovan fail: 14900a708f8fSGustavo F. Padovan kfree_skb(skb); 14910a708f8fSGustavo F. Padovan return NULL; 14920a708f8fSGustavo F. Padovan } 14930a708f8fSGustavo F. Padovan 14940a708f8fSGustavo F. Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) 14950a708f8fSGustavo F. Padovan { 14960a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 14970a708f8fSGustavo F. Padovan int len; 14980a708f8fSGustavo F. Padovan 14990a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 15000a708f8fSGustavo F. Padovan *ptr += len; 15010a708f8fSGustavo F. Padovan 15020a708f8fSGustavo F. Padovan *type = opt->type; 15030a708f8fSGustavo F. Padovan *olen = opt->len; 15040a708f8fSGustavo F. Padovan 15050a708f8fSGustavo F. Padovan switch (opt->len) { 15060a708f8fSGustavo F. Padovan case 1: 15070a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 15080a708f8fSGustavo F. Padovan break; 15090a708f8fSGustavo F. Padovan 15100a708f8fSGustavo F. Padovan case 2: 15110a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 15120a708f8fSGustavo F. Padovan break; 15130a708f8fSGustavo F. Padovan 15140a708f8fSGustavo F. Padovan case 4: 15150a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 15160a708f8fSGustavo F. Padovan break; 15170a708f8fSGustavo F. Padovan 15180a708f8fSGustavo F. Padovan default: 15190a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 15200a708f8fSGustavo F. Padovan break; 15210a708f8fSGustavo F. Padovan } 15220a708f8fSGustavo F. Padovan 15230a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); 15240a708f8fSGustavo F. Padovan return len; 15250a708f8fSGustavo F. Padovan } 15260a708f8fSGustavo F. Padovan 15270a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 15280a708f8fSGustavo F. Padovan { 15290a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 15300a708f8fSGustavo F. Padovan 15310a708f8fSGustavo F. Padovan BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); 15320a708f8fSGustavo F. Padovan 15330a708f8fSGustavo F. Padovan opt->type = type; 15340a708f8fSGustavo F. Padovan opt->len = len; 15350a708f8fSGustavo F. Padovan 15360a708f8fSGustavo F. Padovan switch (len) { 15370a708f8fSGustavo F. Padovan case 1: 15380a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 15390a708f8fSGustavo F. Padovan break; 15400a708f8fSGustavo F. Padovan 15410a708f8fSGustavo F. Padovan case 2: 15420a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 15430a708f8fSGustavo F. Padovan break; 15440a708f8fSGustavo F. Padovan 15450a708f8fSGustavo F. Padovan case 4: 15460a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 15470a708f8fSGustavo F. Padovan break; 15480a708f8fSGustavo F. Padovan 15490a708f8fSGustavo F. Padovan default: 15500a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 15510a708f8fSGustavo F. Padovan break; 15520a708f8fSGustavo F. Padovan } 15530a708f8fSGustavo F. Padovan 15540a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 15550a708f8fSGustavo F. Padovan } 15560a708f8fSGustavo F. Padovan 15570a708f8fSGustavo F. Padovan static void l2cap_ack_timeout(unsigned long arg) 15580a708f8fSGustavo F. Padovan { 15590a708f8fSGustavo F. Padovan struct sock *sk = (void *) arg; 15600a708f8fSGustavo F. Padovan 15610a708f8fSGustavo F. Padovan bh_lock_sock(sk); 15620a708f8fSGustavo F. Padovan l2cap_send_ack(l2cap_pi(sk)); 15630a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 15640a708f8fSGustavo F. Padovan } 15650a708f8fSGustavo F. Padovan 15660a708f8fSGustavo F. Padovan static inline void l2cap_ertm_init(struct sock *sk) 15670a708f8fSGustavo F. Padovan { 15680a708f8fSGustavo F. Padovan l2cap_pi(sk)->expected_ack_seq = 0; 15690a708f8fSGustavo F. Padovan l2cap_pi(sk)->unacked_frames = 0; 15700a708f8fSGustavo F. Padovan l2cap_pi(sk)->buffer_seq = 0; 15710a708f8fSGustavo F. Padovan l2cap_pi(sk)->num_acked = 0; 15720a708f8fSGustavo F. Padovan l2cap_pi(sk)->frames_sent = 0; 15730a708f8fSGustavo F. Padovan 15740a708f8fSGustavo F. Padovan setup_timer(&l2cap_pi(sk)->retrans_timer, 15750a708f8fSGustavo F. Padovan l2cap_retrans_timeout, (unsigned long) sk); 15760a708f8fSGustavo F. Padovan setup_timer(&l2cap_pi(sk)->monitor_timer, 15770a708f8fSGustavo F. Padovan l2cap_monitor_timeout, (unsigned long) sk); 15780a708f8fSGustavo F. Padovan setup_timer(&l2cap_pi(sk)->ack_timer, 15790a708f8fSGustavo F. Padovan l2cap_ack_timeout, (unsigned long) sk); 15800a708f8fSGustavo F. Padovan 15810a708f8fSGustavo F. Padovan __skb_queue_head_init(SREJ_QUEUE(sk)); 15820a708f8fSGustavo F. Padovan __skb_queue_head_init(BUSY_QUEUE(sk)); 15830a708f8fSGustavo F. Padovan 15840a708f8fSGustavo F. Padovan INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); 15850a708f8fSGustavo F. Padovan 15860a708f8fSGustavo F. Padovan sk->sk_backlog_rcv = l2cap_ertm_data_rcv; 15870a708f8fSGustavo F. Padovan } 15880a708f8fSGustavo F. Padovan 15890a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 15900a708f8fSGustavo F. Padovan { 15910a708f8fSGustavo F. Padovan switch (mode) { 15920a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 15930a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 15940a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 15950a708f8fSGustavo F. Padovan return mode; 15960a708f8fSGustavo F. Padovan /* fall through */ 15970a708f8fSGustavo F. Padovan default: 15980a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 15990a708f8fSGustavo F. Padovan } 16000a708f8fSGustavo F. Padovan } 16010a708f8fSGustavo F. Padovan 1602710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 16030a708f8fSGustavo F. Padovan { 160473ffa904SGustavo F. Padovan struct sock *sk = chan->sk; 16050a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 16060a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 16070a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = pi->mode }; 16080a708f8fSGustavo F. Padovan void *ptr = req->data; 16090a708f8fSGustavo F. Padovan 16100a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 16110a708f8fSGustavo F. Padovan 161273ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 16130a708f8fSGustavo F. Padovan goto done; 16140a708f8fSGustavo F. Padovan 16150a708f8fSGustavo F. Padovan switch (pi->mode) { 16160a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 16170a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 16180a708f8fSGustavo F. Padovan if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) 16190a708f8fSGustavo F. Padovan break; 16200a708f8fSGustavo F. Padovan 16210a708f8fSGustavo F. Padovan /* fall through */ 16220a708f8fSGustavo F. Padovan default: 16230a708f8fSGustavo F. Padovan pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); 16240a708f8fSGustavo F. Padovan break; 16250a708f8fSGustavo F. Padovan } 16260a708f8fSGustavo F. Padovan 16270a708f8fSGustavo F. Padovan done: 16280a708f8fSGustavo F. Padovan if (pi->imtu != L2CAP_DEFAULT_MTU) 16290a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); 16300a708f8fSGustavo F. Padovan 16310a708f8fSGustavo F. Padovan switch (pi->mode) { 16320a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 16330a708f8fSGustavo F. Padovan if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && 16340a708f8fSGustavo F. Padovan !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) 16350a708f8fSGustavo F. Padovan break; 16360a708f8fSGustavo F. Padovan 16370a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 16380a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 16390a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 16400a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 16410a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 16420a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 16430a708f8fSGustavo F. Padovan 16440a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 16450a708f8fSGustavo F. Padovan (unsigned long) &rfc); 16460a708f8fSGustavo F. Padovan break; 16470a708f8fSGustavo F. Padovan 16480a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 16490a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 16500a708f8fSGustavo F. Padovan rfc.txwin_size = pi->tx_win; 16510a708f8fSGustavo F. Padovan rfc.max_transmit = pi->max_tx; 16520a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 16530a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 16540a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 16550a708f8fSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) 16560a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 16570a708f8fSGustavo F. Padovan 16580a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 16590a708f8fSGustavo F. Padovan (unsigned long) &rfc); 16600a708f8fSGustavo F. Padovan 16610a708f8fSGustavo F. Padovan if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) 16620a708f8fSGustavo F. Padovan break; 16630a708f8fSGustavo F. Padovan 16640a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_NONE || 16650a708f8fSGustavo F. Padovan pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { 16660a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 16670a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); 16680a708f8fSGustavo F. Padovan } 16690a708f8fSGustavo F. Padovan break; 16700a708f8fSGustavo F. Padovan 16710a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 16720a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 16730a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 16740a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 16750a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 16760a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 16770a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); 16780a708f8fSGustavo F. Padovan if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) 16790a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 16800a708f8fSGustavo F. Padovan 16810a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 16820a708f8fSGustavo F. Padovan (unsigned long) &rfc); 16830a708f8fSGustavo F. Padovan 16840a708f8fSGustavo F. Padovan if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) 16850a708f8fSGustavo F. Padovan break; 16860a708f8fSGustavo F. Padovan 16870a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_NONE || 16880a708f8fSGustavo F. Padovan pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { 16890a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 16900a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); 16910a708f8fSGustavo F. Padovan } 16920a708f8fSGustavo F. Padovan break; 16930a708f8fSGustavo F. Padovan } 16940a708f8fSGustavo F. Padovan 16950a708f8fSGustavo F. Padovan req->dcid = cpu_to_le16(pi->dcid); 16960a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0); 16970a708f8fSGustavo F. Padovan 16980a708f8fSGustavo F. Padovan return ptr - data; 16990a708f8fSGustavo F. Padovan } 17000a708f8fSGustavo F. Padovan 170173ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 17020a708f8fSGustavo F. Padovan { 170373ffa904SGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(chan->sk); 17040a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 17050a708f8fSGustavo F. Padovan void *ptr = rsp->data; 170673ffa904SGustavo F. Padovan void *req = chan->conf_req; 170773ffa904SGustavo F. Padovan int len = chan->conf_len; 17080a708f8fSGustavo F. Padovan int type, hint, olen; 17090a708f8fSGustavo F. Padovan unsigned long val; 17100a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 17110a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 17120a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 17130a708f8fSGustavo F. Padovan 171473ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 17150a708f8fSGustavo F. Padovan 17160a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 17170a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 17180a708f8fSGustavo F. Padovan 17190a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 17200a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 17210a708f8fSGustavo F. Padovan 17220a708f8fSGustavo F. Padovan switch (type) { 17230a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 17240a708f8fSGustavo F. Padovan mtu = val; 17250a708f8fSGustavo F. Padovan break; 17260a708f8fSGustavo F. Padovan 17270a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 17280a708f8fSGustavo F. Padovan pi->flush_to = val; 17290a708f8fSGustavo F. Padovan break; 17300a708f8fSGustavo F. Padovan 17310a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 17320a708f8fSGustavo F. Padovan break; 17330a708f8fSGustavo F. Padovan 17340a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 17350a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 17360a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 17370a708f8fSGustavo F. Padovan break; 17380a708f8fSGustavo F. Padovan 17390a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 17400a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 17410a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; 17420a708f8fSGustavo F. Padovan 17430a708f8fSGustavo F. Padovan break; 17440a708f8fSGustavo F. Padovan 17450a708f8fSGustavo F. Padovan default: 17460a708f8fSGustavo F. Padovan if (hint) 17470a708f8fSGustavo F. Padovan break; 17480a708f8fSGustavo F. Padovan 17490a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 17500a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 17510a708f8fSGustavo F. Padovan break; 17520a708f8fSGustavo F. Padovan } 17530a708f8fSGustavo F. Padovan } 17540a708f8fSGustavo F. Padovan 175573ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 17560a708f8fSGustavo F. Padovan goto done; 17570a708f8fSGustavo F. Padovan 17580a708f8fSGustavo F. Padovan switch (pi->mode) { 17590a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 17600a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 17610a708f8fSGustavo F. Padovan if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { 17620a708f8fSGustavo F. Padovan pi->mode = l2cap_select_mode(rfc.mode, 17630a708f8fSGustavo F. Padovan pi->conn->feat_mask); 17640a708f8fSGustavo F. Padovan break; 17650a708f8fSGustavo F. Padovan } 17660a708f8fSGustavo F. Padovan 17670a708f8fSGustavo F. Padovan if (pi->mode != rfc.mode) 17680a708f8fSGustavo F. Padovan return -ECONNREFUSED; 17690a708f8fSGustavo F. Padovan 17700a708f8fSGustavo F. Padovan break; 17710a708f8fSGustavo F. Padovan } 17720a708f8fSGustavo F. Padovan 17730a708f8fSGustavo F. Padovan done: 17740a708f8fSGustavo F. Padovan if (pi->mode != rfc.mode) { 17750a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 17760a708f8fSGustavo F. Padovan rfc.mode = pi->mode; 17770a708f8fSGustavo F. Padovan 177873ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 17790a708f8fSGustavo F. Padovan return -ECONNREFUSED; 17800a708f8fSGustavo F. Padovan 17810a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 17820a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 17830a708f8fSGustavo F. Padovan } 17840a708f8fSGustavo F. Padovan 17850a708f8fSGustavo F. Padovan 17860a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 17870a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 17880a708f8fSGustavo F. Padovan * which ones we don't like. */ 17890a708f8fSGustavo F. Padovan 17900a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 17910a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 17920a708f8fSGustavo F. Padovan else { 17930a708f8fSGustavo F. Padovan pi->omtu = mtu; 17940a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MTU_DONE; 17950a708f8fSGustavo F. Padovan } 17960a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); 17970a708f8fSGustavo F. Padovan 17980a708f8fSGustavo F. Padovan switch (rfc.mode) { 17990a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 18000a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 18010a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MODE_DONE; 18020a708f8fSGustavo F. Padovan break; 18030a708f8fSGustavo F. Padovan 18040a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 18050a708f8fSGustavo F. Padovan pi->remote_tx_win = rfc.txwin_size; 18060a708f8fSGustavo F. Padovan pi->remote_max_tx = rfc.max_transmit; 18070a708f8fSGustavo F. Padovan 18080a708f8fSGustavo F. Padovan if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) 18090a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 18100a708f8fSGustavo F. Padovan 18110a708f8fSGustavo F. Padovan pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); 18120a708f8fSGustavo F. Padovan 18130a708f8fSGustavo F. Padovan rfc.retrans_timeout = 18140a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); 18150a708f8fSGustavo F. Padovan rfc.monitor_timeout = 18160a708f8fSGustavo F. Padovan le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); 18170a708f8fSGustavo F. Padovan 18180a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MODE_DONE; 18190a708f8fSGustavo F. Padovan 18200a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 18210a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 18220a708f8fSGustavo F. Padovan 18230a708f8fSGustavo F. Padovan break; 18240a708f8fSGustavo F. Padovan 18250a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 18260a708f8fSGustavo F. Padovan if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) 18270a708f8fSGustavo F. Padovan rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); 18280a708f8fSGustavo F. Padovan 18290a708f8fSGustavo F. Padovan pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); 18300a708f8fSGustavo F. Padovan 18310a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_MODE_DONE; 18320a708f8fSGustavo F. Padovan 18330a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 18340a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 18350a708f8fSGustavo F. Padovan 18360a708f8fSGustavo F. Padovan break; 18370a708f8fSGustavo F. Padovan 18380a708f8fSGustavo F. Padovan default: 18390a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 18400a708f8fSGustavo F. Padovan 18410a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 18420a708f8fSGustavo F. Padovan rfc.mode = pi->mode; 18430a708f8fSGustavo F. Padovan } 18440a708f8fSGustavo F. Padovan 18450a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 18460a708f8fSGustavo F. Padovan pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; 18470a708f8fSGustavo F. Padovan } 18480a708f8fSGustavo F. Padovan rsp->scid = cpu_to_le16(pi->dcid); 18490a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 18500a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(0x0000); 18510a708f8fSGustavo F. Padovan 18520a708f8fSGustavo F. Padovan return ptr - data; 18530a708f8fSGustavo F. Padovan } 18540a708f8fSGustavo F. Padovan 18550a708f8fSGustavo F. Padovan static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) 18560a708f8fSGustavo F. Padovan { 18570a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 18580a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 18590a708f8fSGustavo F. Padovan void *ptr = req->data; 18600a708f8fSGustavo F. Padovan int type, olen; 18610a708f8fSGustavo F. Padovan unsigned long val; 18620a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 18630a708f8fSGustavo F. Padovan 18640a708f8fSGustavo F. Padovan BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); 18650a708f8fSGustavo F. Padovan 18660a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 18670a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 18680a708f8fSGustavo F. Padovan 18690a708f8fSGustavo F. Padovan switch (type) { 18700a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 18710a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 18720a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 18730a708f8fSGustavo F. Padovan pi->imtu = L2CAP_DEFAULT_MIN_MTU; 18740a708f8fSGustavo F. Padovan } else 18750a708f8fSGustavo F. Padovan pi->imtu = val; 18760a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); 18770a708f8fSGustavo F. Padovan break; 18780a708f8fSGustavo F. Padovan 18790a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 18800a708f8fSGustavo F. Padovan pi->flush_to = val; 18810a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 18820a708f8fSGustavo F. Padovan 2, pi->flush_to); 18830a708f8fSGustavo F. Padovan break; 18840a708f8fSGustavo F. Padovan 18850a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 18860a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 18870a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 18880a708f8fSGustavo F. Padovan 18890a708f8fSGustavo F. Padovan if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && 18900a708f8fSGustavo F. Padovan rfc.mode != pi->mode) 18910a708f8fSGustavo F. Padovan return -ECONNREFUSED; 18920a708f8fSGustavo F. Padovan 18930a708f8fSGustavo F. Padovan pi->fcs = 0; 18940a708f8fSGustavo F. Padovan 18950a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 18960a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 18970a708f8fSGustavo F. Padovan break; 18980a708f8fSGustavo F. Padovan } 18990a708f8fSGustavo F. Padovan } 19000a708f8fSGustavo F. Padovan 19010a708f8fSGustavo F. Padovan if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) 19020a708f8fSGustavo F. Padovan return -ECONNREFUSED; 19030a708f8fSGustavo F. Padovan 19040a708f8fSGustavo F. Padovan pi->mode = rfc.mode; 19050a708f8fSGustavo F. Padovan 19060a708f8fSGustavo F. Padovan if (*result == L2CAP_CONF_SUCCESS) { 19070a708f8fSGustavo F. Padovan switch (rfc.mode) { 19080a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 19090a708f8fSGustavo F. Padovan pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 19100a708f8fSGustavo F. Padovan pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 19110a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19120a708f8fSGustavo F. Padovan break; 19130a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 19140a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19150a708f8fSGustavo F. Padovan } 19160a708f8fSGustavo F. Padovan } 19170a708f8fSGustavo F. Padovan 19180a708f8fSGustavo F. Padovan req->dcid = cpu_to_le16(pi->dcid); 19190a708f8fSGustavo F. Padovan req->flags = cpu_to_le16(0x0000); 19200a708f8fSGustavo F. Padovan 19210a708f8fSGustavo F. Padovan return ptr - data; 19220a708f8fSGustavo F. Padovan } 19230a708f8fSGustavo F. Padovan 19240a708f8fSGustavo F. Padovan static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) 19250a708f8fSGustavo F. Padovan { 19260a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 19270a708f8fSGustavo F. Padovan void *ptr = rsp->data; 19280a708f8fSGustavo F. Padovan 19290a708f8fSGustavo F. Padovan BT_DBG("sk %p", sk); 19300a708f8fSGustavo F. Padovan 19310a708f8fSGustavo F. Padovan rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); 19320a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 19330a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 19340a708f8fSGustavo F. Padovan 19350a708f8fSGustavo F. Padovan return ptr - data; 19360a708f8fSGustavo F. Padovan } 19370a708f8fSGustavo F. Padovan 1938710f9b0aSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct sock *sk) 1939710f9b0aSGustavo F. Padovan { 1940710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 1941710f9b0aSGustavo F. Padovan struct l2cap_conn *conn = l2cap_pi(sk)->conn; 1942710f9b0aSGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1943710f9b0aSGustavo F. Padovan u8 buf[128]; 1944710f9b0aSGustavo F. Padovan 1945710f9b0aSGustavo F. Padovan sk->sk_state = BT_CONFIG; 1946710f9b0aSGustavo F. Padovan 1947710f9b0aSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 1948710f9b0aSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 1949710f9b0aSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 1950710f9b0aSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 1951710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 1952710f9b0aSGustavo F. Padovan L2CAP_CONN_RSP, sizeof(rsp), &rsp); 1953710f9b0aSGustavo F. Padovan 1954710f9b0aSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) 1955710f9b0aSGustavo F. Padovan return; 1956710f9b0aSGustavo F. Padovan 1957710f9b0aSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 1958710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 1959710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 1960710f9b0aSGustavo F. Padovan chan->num_conf_req++; 1961710f9b0aSGustavo F. Padovan } 1962710f9b0aSGustavo F. Padovan 19630a708f8fSGustavo F. Padovan static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) 19640a708f8fSGustavo F. Padovan { 19650a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 19660a708f8fSGustavo F. Padovan int type, olen; 19670a708f8fSGustavo F. Padovan unsigned long val; 19680a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc; 19690a708f8fSGustavo F. Padovan 19700a708f8fSGustavo F. Padovan BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); 19710a708f8fSGustavo F. Padovan 19720a708f8fSGustavo F. Padovan if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) 19730a708f8fSGustavo F. Padovan return; 19740a708f8fSGustavo F. Padovan 19750a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 19760a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 19770a708f8fSGustavo F. Padovan 19780a708f8fSGustavo F. Padovan switch (type) { 19790a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 19800a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 19810a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 19820a708f8fSGustavo F. Padovan goto done; 19830a708f8fSGustavo F. Padovan } 19840a708f8fSGustavo F. Padovan } 19850a708f8fSGustavo F. Padovan 19860a708f8fSGustavo F. Padovan done: 19870a708f8fSGustavo F. Padovan switch (rfc.mode) { 19880a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 19890a708f8fSGustavo F. Padovan pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 19900a708f8fSGustavo F. Padovan pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 19910a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19920a708f8fSGustavo F. Padovan break; 19930a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 19940a708f8fSGustavo F. Padovan pi->mps = le16_to_cpu(rfc.max_pdu_size); 19950a708f8fSGustavo F. Padovan } 19960a708f8fSGustavo F. Padovan } 19970a708f8fSGustavo F. Padovan 19980a708f8fSGustavo F. Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 19990a708f8fSGustavo F. Padovan { 20000a708f8fSGustavo F. Padovan struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; 20010a708f8fSGustavo F. Padovan 20020a708f8fSGustavo F. Padovan if (rej->reason != 0x0000) 20030a708f8fSGustavo F. Padovan return 0; 20040a708f8fSGustavo F. Padovan 20050a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 20060a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 20070a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 20080a708f8fSGustavo F. Padovan 20090a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 20100a708f8fSGustavo F. Padovan conn->info_ident = 0; 20110a708f8fSGustavo F. Padovan 20120a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 20130a708f8fSGustavo F. Padovan } 20140a708f8fSGustavo F. Padovan 20150a708f8fSGustavo F. Padovan return 0; 20160a708f8fSGustavo F. Padovan } 20170a708f8fSGustavo F. Padovan 20180a708f8fSGustavo F. Padovan static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 20190a708f8fSGustavo F. Padovan { 20200a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 20210a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 202273ffa904SGustavo F. Padovan struct l2cap_chan *chan = NULL; 20230a708f8fSGustavo F. Padovan struct sock *parent, *sk = NULL; 20240a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 20250a708f8fSGustavo F. Padovan 20260a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 20270a708f8fSGustavo F. Padovan __le16 psm = req->psm; 20280a708f8fSGustavo F. Padovan 20290a708f8fSGustavo F. Padovan BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); 20300a708f8fSGustavo F. Padovan 20310a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 20320a708f8fSGustavo F. Padovan parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); 20330a708f8fSGustavo F. Padovan if (!parent) { 20340a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 20350a708f8fSGustavo F. Padovan goto sendresp; 20360a708f8fSGustavo F. Padovan } 20370a708f8fSGustavo F. Padovan 20380a708f8fSGustavo F. Padovan bh_lock_sock(parent); 20390a708f8fSGustavo F. Padovan 20400a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 20410a708f8fSGustavo F. Padovan if (psm != cpu_to_le16(0x0001) && 20420a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 20430a708f8fSGustavo F. Padovan conn->disc_reason = 0x05; 20440a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 20450a708f8fSGustavo F. Padovan goto response; 20460a708f8fSGustavo F. Padovan } 20470a708f8fSGustavo F. Padovan 20480a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 20490a708f8fSGustavo F. Padovan 20500a708f8fSGustavo F. Padovan /* Check for backlog size */ 20510a708f8fSGustavo F. Padovan if (sk_acceptq_is_full(parent)) { 20520a708f8fSGustavo F. Padovan BT_DBG("backlog full %d", parent->sk_ack_backlog); 20530a708f8fSGustavo F. Padovan goto response; 20540a708f8fSGustavo F. Padovan } 20550a708f8fSGustavo F. Padovan 20560a708f8fSGustavo F. Padovan sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); 20570a708f8fSGustavo F. Padovan if (!sk) 20580a708f8fSGustavo F. Padovan goto response; 20590a708f8fSGustavo F. Padovan 206048454079SGustavo F. Padovan chan = l2cap_chan_alloc(sk); 206148454079SGustavo F. Padovan if (!chan) { 206248454079SGustavo F. Padovan l2cap_sock_kill(sk); 206348454079SGustavo F. Padovan goto response; 206448454079SGustavo F. Padovan } 206548454079SGustavo F. Padovan 2066baa7e1faSGustavo F. Padovan write_lock_bh(&conn->chan_lock); 20670a708f8fSGustavo F. Padovan 20680a708f8fSGustavo F. Padovan /* Check if we already have channel with that dcid */ 2069baa7e1faSGustavo F. Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) { 2070baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 20710a708f8fSGustavo F. Padovan sock_set_flag(sk, SOCK_ZAPPED); 20720a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 20730a708f8fSGustavo F. Padovan goto response; 20740a708f8fSGustavo F. Padovan } 20750a708f8fSGustavo F. Padovan 20760a708f8fSGustavo F. Padovan hci_conn_hold(conn->hcon); 20770a708f8fSGustavo F. Padovan 20780a708f8fSGustavo F. Padovan l2cap_sock_init(sk, parent); 20790a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->src, conn->src); 20800a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->dst, conn->dst); 20810a708f8fSGustavo F. Padovan l2cap_pi(sk)->psm = psm; 20820a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = scid; 20830a708f8fSGustavo F. Padovan 2084d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 2085d1010240SGustavo F. Padovan 208648454079SGustavo F. Padovan __l2cap_chan_add(conn, chan); 208748454079SGustavo F. Padovan 208848454079SGustavo F. Padovan l2cap_pi(sk)->chan = chan; 208948454079SGustavo F. Padovan 20900a708f8fSGustavo F. Padovan dcid = l2cap_pi(sk)->scid; 20910a708f8fSGustavo F. Padovan 20920a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, sk->sk_sndtimeo); 20930a708f8fSGustavo F. Padovan 2094fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 20950a708f8fSGustavo F. Padovan 20960a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 20970a708f8fSGustavo F. Padovan if (l2cap_check_security(sk)) { 20980a708f8fSGustavo F. Padovan if (bt_sk(sk)->defer_setup) { 20990a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 21000a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 21010a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 21020a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 21030a708f8fSGustavo F. Padovan } else { 21040a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 21050a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 21060a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 21070a708f8fSGustavo F. Padovan } 21080a708f8fSGustavo F. Padovan } else { 21090a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 21100a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 21110a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 21120a708f8fSGustavo F. Padovan } 21130a708f8fSGustavo F. Padovan } else { 21140a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECT2; 21150a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 21160a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 21170a708f8fSGustavo F. Padovan } 21180a708f8fSGustavo F. Padovan 2119baa7e1faSGustavo F. Padovan write_unlock_bh(&conn->chan_lock); 21200a708f8fSGustavo F. Padovan 21210a708f8fSGustavo F. Padovan response: 21220a708f8fSGustavo F. Padovan bh_unlock_sock(parent); 21230a708f8fSGustavo F. Padovan 21240a708f8fSGustavo F. Padovan sendresp: 21250a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 21260a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 21270a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 21280a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 21290a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); 21300a708f8fSGustavo F. Padovan 21310a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 21320a708f8fSGustavo F. Padovan struct l2cap_info_req info; 21330a708f8fSGustavo F. Padovan info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 21340a708f8fSGustavo F. Padovan 21350a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 21360a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 21370a708f8fSGustavo F. Padovan 21380a708f8fSGustavo F. Padovan mod_timer(&conn->info_timer, jiffies + 21390a708f8fSGustavo F. Padovan msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); 21400a708f8fSGustavo F. Padovan 21410a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 21420a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(info), &info); 21430a708f8fSGustavo F. Padovan } 21440a708f8fSGustavo F. Padovan 214573ffa904SGustavo F. Padovan if (chan && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && 21460a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 21470a708f8fSGustavo F. Padovan u8 buf[128]; 21480a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 21490a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 215073ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 215173ffa904SGustavo F. Padovan chan->num_conf_req++; 21520a708f8fSGustavo F. Padovan } 21530a708f8fSGustavo F. Padovan 21540a708f8fSGustavo F. Padovan return 0; 21550a708f8fSGustavo F. Padovan } 21560a708f8fSGustavo F. Padovan 21570a708f8fSGustavo F. Padovan static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 21580a708f8fSGustavo F. Padovan { 21590a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 21600a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 216148454079SGustavo F. Padovan struct l2cap_chan *chan; 21620a708f8fSGustavo F. Padovan struct sock *sk; 21630a708f8fSGustavo F. Padovan u8 req[128]; 21640a708f8fSGustavo F. Padovan 21650a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 21660a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 21670a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 21680a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 21690a708f8fSGustavo F. Padovan 21700a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); 21710a708f8fSGustavo F. Padovan 21720a708f8fSGustavo F. Padovan if (scid) { 2173baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 217448454079SGustavo F. Padovan if (!chan) 21750a708f8fSGustavo F. Padovan return -EFAULT; 21760a708f8fSGustavo F. Padovan } else { 2177baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_ident(conn, cmd->ident); 217848454079SGustavo F. Padovan if (!chan) 21790a708f8fSGustavo F. Padovan return -EFAULT; 21800a708f8fSGustavo F. Padovan } 21810a708f8fSGustavo F. Padovan 218248454079SGustavo F. Padovan sk = chan->sk; 218348454079SGustavo F. Padovan 21840a708f8fSGustavo F. Padovan switch (result) { 21850a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 21860a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 2187fc7f8a7eSGustavo F. Padovan chan->ident = 0; 21880a708f8fSGustavo F. Padovan l2cap_pi(sk)->dcid = dcid; 21890a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; 21900a708f8fSGustavo F. Padovan 21910a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) 21920a708f8fSGustavo F. Padovan break; 21930a708f8fSGustavo F. Padovan 21940a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 21950a708f8fSGustavo F. Padovan 21960a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 219773ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 219873ffa904SGustavo F. Padovan chan->num_conf_req++; 21990a708f8fSGustavo F. Padovan break; 22000a708f8fSGustavo F. Padovan 22010a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 22020a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 22030a708f8fSGustavo F. Padovan break; 22040a708f8fSGustavo F. Padovan 22050a708f8fSGustavo F. Padovan default: 22060a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 22070a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 22080a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 22090a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 22100a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 5); 22110a708f8fSGustavo F. Padovan break; 22120a708f8fSGustavo F. Padovan } 22130a708f8fSGustavo F. Padovan 221448454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 22150a708f8fSGustavo F. Padovan break; 22160a708f8fSGustavo F. Padovan } 22170a708f8fSGustavo F. Padovan 22180a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 22190a708f8fSGustavo F. Padovan return 0; 22200a708f8fSGustavo F. Padovan } 22210a708f8fSGustavo F. Padovan 22220a708f8fSGustavo F. Padovan static inline void set_default_fcs(struct l2cap_pinfo *pi) 22230a708f8fSGustavo F. Padovan { 22240a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 22250a708f8fSGustavo F. Padovan * sides request it. 22260a708f8fSGustavo F. Padovan */ 22270a708f8fSGustavo F. Padovan if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) 22280a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_NONE; 22290a708f8fSGustavo F. Padovan else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) 22300a708f8fSGustavo F. Padovan pi->fcs = L2CAP_FCS_CRC16; 22310a708f8fSGustavo F. Padovan } 22320a708f8fSGustavo F. Padovan 22330a708f8fSGustavo F. Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 22340a708f8fSGustavo F. Padovan { 22350a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 22360a708f8fSGustavo F. Padovan u16 dcid, flags; 22370a708f8fSGustavo F. Padovan u8 rsp[64]; 223848454079SGustavo F. Padovan struct l2cap_chan *chan; 22390a708f8fSGustavo F. Padovan struct sock *sk; 22400a708f8fSGustavo F. Padovan int len; 22410a708f8fSGustavo F. Padovan 22420a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 22430a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 22440a708f8fSGustavo F. Padovan 22450a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 22460a708f8fSGustavo F. Padovan 2247baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 224848454079SGustavo F. Padovan if (!chan) 22490a708f8fSGustavo F. Padovan return -ENOENT; 22500a708f8fSGustavo F. Padovan 225148454079SGustavo F. Padovan sk = chan->sk; 225248454079SGustavo F. Padovan 22530a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONFIG) { 22540a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 22550a708f8fSGustavo F. Padovan 22560a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0x0002); 22570a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 22580a708f8fSGustavo F. Padovan sizeof(rej), &rej); 22590a708f8fSGustavo F. Padovan goto unlock; 22600a708f8fSGustavo F. Padovan } 22610a708f8fSGustavo F. Padovan 22620a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 22630a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 226473ffa904SGustavo F. Padovan if (chan->conf_len + len > sizeof(chan->conf_req)) { 22650a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 22660a708f8fSGustavo F. Padovan l2cap_build_conf_rsp(sk, rsp, 22670a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 22680a708f8fSGustavo F. Padovan goto unlock; 22690a708f8fSGustavo F. Padovan } 22700a708f8fSGustavo F. Padovan 22710a708f8fSGustavo F. Padovan /* Store config. */ 227273ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 227373ffa904SGustavo F. Padovan chan->conf_len += len; 22740a708f8fSGustavo F. Padovan 22750a708f8fSGustavo F. Padovan if (flags & 0x0001) { 22760a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 22770a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 22780a708f8fSGustavo F. Padovan l2cap_build_conf_rsp(sk, rsp, 22790a708f8fSGustavo F. Padovan L2CAP_CONF_SUCCESS, 0x0001), rsp); 22800a708f8fSGustavo F. Padovan goto unlock; 22810a708f8fSGustavo F. Padovan } 22820a708f8fSGustavo F. Padovan 22830a708f8fSGustavo F. Padovan /* Complete config. */ 228473ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 22850a708f8fSGustavo F. Padovan if (len < 0) { 22860a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 22870a708f8fSGustavo F. Padovan goto unlock; 22880a708f8fSGustavo F. Padovan } 22890a708f8fSGustavo F. Padovan 22900a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 229173ffa904SGustavo F. Padovan chan->num_conf_rsp++; 22920a708f8fSGustavo F. Padovan 22930a708f8fSGustavo F. Padovan /* Reset config buffer. */ 229473ffa904SGustavo F. Padovan chan->conf_len = 0; 22950a708f8fSGustavo F. Padovan 22960a708f8fSGustavo F. Padovan if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) 22970a708f8fSGustavo F. Padovan goto unlock; 22980a708f8fSGustavo F. Padovan 22990a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { 23000a708f8fSGustavo F. Padovan set_default_fcs(l2cap_pi(sk)); 23010a708f8fSGustavo F. Padovan 23020a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 23030a708f8fSGustavo F. Padovan 23040a708f8fSGustavo F. Padovan l2cap_pi(sk)->next_tx_seq = 0; 23050a708f8fSGustavo F. Padovan l2cap_pi(sk)->expected_tx_seq = 0; 23060a708f8fSGustavo F. Padovan __skb_queue_head_init(TX_QUEUE(sk)); 23070a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) 23080a708f8fSGustavo F. Padovan l2cap_ertm_init(sk); 23090a708f8fSGustavo F. Padovan 23100a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 23110a708f8fSGustavo F. Padovan goto unlock; 23120a708f8fSGustavo F. Padovan } 23130a708f8fSGustavo F. Padovan 23140a708f8fSGustavo F. Padovan if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { 23150a708f8fSGustavo F. Padovan u8 buf[64]; 23160a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; 23170a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 231873ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 231973ffa904SGustavo F. Padovan chan->num_conf_req++; 23200a708f8fSGustavo F. Padovan } 23210a708f8fSGustavo F. Padovan 23220a708f8fSGustavo F. Padovan unlock: 23230a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 23240a708f8fSGustavo F. Padovan return 0; 23250a708f8fSGustavo F. Padovan } 23260a708f8fSGustavo F. Padovan 23270a708f8fSGustavo F. Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 23280a708f8fSGustavo F. Padovan { 23290a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 23300a708f8fSGustavo F. Padovan u16 scid, flags, result; 233148454079SGustavo F. Padovan struct l2cap_chan *chan; 23320a708f8fSGustavo F. Padovan struct sock *sk; 23330a708f8fSGustavo F. Padovan int len = cmd->len - sizeof(*rsp); 23340a708f8fSGustavo F. Padovan 23350a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 23360a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 23370a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 23380a708f8fSGustavo F. Padovan 23390a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", 23400a708f8fSGustavo F. Padovan scid, flags, result); 23410a708f8fSGustavo F. Padovan 2342baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 234348454079SGustavo F. Padovan if (!chan) 23440a708f8fSGustavo F. Padovan return 0; 23450a708f8fSGustavo F. Padovan 234648454079SGustavo F. Padovan sk = chan->sk; 234748454079SGustavo F. Padovan 23480a708f8fSGustavo F. Padovan switch (result) { 23490a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 23500a708f8fSGustavo F. Padovan l2cap_conf_rfc_get(sk, rsp->data, len); 23510a708f8fSGustavo F. Padovan break; 23520a708f8fSGustavo F. Padovan 23530a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 235473ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 23550a708f8fSGustavo F. Padovan char req[64]; 23560a708f8fSGustavo F. Padovan 23570a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 23580a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 23590a708f8fSGustavo F. Padovan goto done; 23600a708f8fSGustavo F. Padovan } 23610a708f8fSGustavo F. Padovan 23620a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 23630a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 23640a708f8fSGustavo F. Padovan len = l2cap_parse_conf_rsp(sk, rsp->data, 23650a708f8fSGustavo F. Padovan len, req, &result); 23660a708f8fSGustavo F. Padovan if (len < 0) { 23670a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 23680a708f8fSGustavo F. Padovan goto done; 23690a708f8fSGustavo F. Padovan } 23700a708f8fSGustavo F. Padovan 23710a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 23720a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 237373ffa904SGustavo F. Padovan chan->num_conf_req++; 23740a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 23750a708f8fSGustavo F. Padovan goto done; 23760a708f8fSGustavo F. Padovan break; 23770a708f8fSGustavo F. Padovan } 23780a708f8fSGustavo F. Padovan 23790a708f8fSGustavo F. Padovan default: 23800a708f8fSGustavo F. Padovan sk->sk_err = ECONNRESET; 23810a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ * 5); 23820a708f8fSGustavo F. Padovan l2cap_send_disconn_req(conn, sk, ECONNRESET); 23830a708f8fSGustavo F. Padovan goto done; 23840a708f8fSGustavo F. Padovan } 23850a708f8fSGustavo F. Padovan 23860a708f8fSGustavo F. Padovan if (flags & 0x01) 23870a708f8fSGustavo F. Padovan goto done; 23880a708f8fSGustavo F. Padovan 23890a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; 23900a708f8fSGustavo F. Padovan 23910a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { 23920a708f8fSGustavo F. Padovan set_default_fcs(l2cap_pi(sk)); 23930a708f8fSGustavo F. Padovan 23940a708f8fSGustavo F. Padovan sk->sk_state = BT_CONNECTED; 23950a708f8fSGustavo F. Padovan l2cap_pi(sk)->next_tx_seq = 0; 23960a708f8fSGustavo F. Padovan l2cap_pi(sk)->expected_tx_seq = 0; 23970a708f8fSGustavo F. Padovan __skb_queue_head_init(TX_QUEUE(sk)); 23980a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) 23990a708f8fSGustavo F. Padovan l2cap_ertm_init(sk); 24000a708f8fSGustavo F. Padovan 24010a708f8fSGustavo F. Padovan l2cap_chan_ready(sk); 24020a708f8fSGustavo F. Padovan } 24030a708f8fSGustavo F. Padovan 24040a708f8fSGustavo F. Padovan done: 24050a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24060a708f8fSGustavo F. Padovan return 0; 24070a708f8fSGustavo F. Padovan } 24080a708f8fSGustavo F. Padovan 24090a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24100a708f8fSGustavo F. Padovan { 24110a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 24120a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 24130a708f8fSGustavo F. Padovan u16 dcid, scid; 241448454079SGustavo F. Padovan struct l2cap_chan *chan; 24150a708f8fSGustavo F. Padovan struct sock *sk; 24160a708f8fSGustavo F. Padovan 24170a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 24180a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 24190a708f8fSGustavo F. Padovan 24200a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 24210a708f8fSGustavo F. Padovan 2422baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 242348454079SGustavo F. Padovan if (!chan) 24240a708f8fSGustavo F. Padovan return 0; 24250a708f8fSGustavo F. Padovan 242648454079SGustavo F. Padovan sk = chan->sk; 242748454079SGustavo F. Padovan 24280a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 24290a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 24300a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 24310a708f8fSGustavo F. Padovan 24320a708f8fSGustavo F. Padovan sk->sk_shutdown = SHUTDOWN_MASK; 24330a708f8fSGustavo F. Padovan 24340a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 24350a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 24360a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 24370a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 24380a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 5); 24390a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24400a708f8fSGustavo F. Padovan return 0; 24410a708f8fSGustavo F. Padovan } 24420a708f8fSGustavo F. Padovan 244348454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 24440a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24450a708f8fSGustavo F. Padovan 24460a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 24470a708f8fSGustavo F. Padovan return 0; 24480a708f8fSGustavo F. Padovan } 24490a708f8fSGustavo F. Padovan 24500a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24510a708f8fSGustavo F. Padovan { 24520a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 24530a708f8fSGustavo F. Padovan u16 dcid, scid; 245448454079SGustavo F. Padovan struct l2cap_chan *chan; 24550a708f8fSGustavo F. Padovan struct sock *sk; 24560a708f8fSGustavo F. Padovan 24570a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 24580a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 24590a708f8fSGustavo F. Padovan 24600a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 24610a708f8fSGustavo F. Padovan 2462baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 246348454079SGustavo F. Padovan if (!chan) 24640a708f8fSGustavo F. Padovan return 0; 24650a708f8fSGustavo F. Padovan 246648454079SGustavo F. Padovan sk = chan->sk; 246748454079SGustavo F. Padovan 24680a708f8fSGustavo F. Padovan /* don't delete l2cap channel if sk is owned by user */ 24690a708f8fSGustavo F. Padovan if (sock_owned_by_user(sk)) { 24700a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 24710a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 24720a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 5); 24730a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24740a708f8fSGustavo F. Padovan return 0; 24750a708f8fSGustavo F. Padovan } 24760a708f8fSGustavo F. Padovan 247748454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 24780a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 24790a708f8fSGustavo F. Padovan 24800a708f8fSGustavo F. Padovan l2cap_sock_kill(sk); 24810a708f8fSGustavo F. Padovan return 0; 24820a708f8fSGustavo F. Padovan } 24830a708f8fSGustavo F. Padovan 24840a708f8fSGustavo F. Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 24850a708f8fSGustavo F. Padovan { 24860a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 24870a708f8fSGustavo F. Padovan u16 type; 24880a708f8fSGustavo F. Padovan 24890a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 24900a708f8fSGustavo F. Padovan 24910a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 24920a708f8fSGustavo F. Padovan 24930a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 24940a708f8fSGustavo F. Padovan u8 buf[8]; 24950a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 24960a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 24970a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 24980a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 24990a708f8fSGustavo F. Padovan if (!disable_ertm) 25000a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 25010a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 25020a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 25030a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 25040a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 25050a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 25060a708f8fSGustavo F. Padovan u8 buf[12]; 25070a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 25080a708f8fSGustavo F. Padovan rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 25090a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 25100a708f8fSGustavo F. Padovan memcpy(buf + 4, l2cap_fixed_chan, 8); 25110a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 25120a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 25130a708f8fSGustavo F. Padovan } else { 25140a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 25150a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 25160a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); 25170a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 25180a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(rsp), &rsp); 25190a708f8fSGustavo F. Padovan } 25200a708f8fSGustavo F. Padovan 25210a708f8fSGustavo F. Padovan return 0; 25220a708f8fSGustavo F. Padovan } 25230a708f8fSGustavo F. Padovan 25240a708f8fSGustavo F. Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 25250a708f8fSGustavo F. Padovan { 25260a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 25270a708f8fSGustavo F. Padovan u16 type, result; 25280a708f8fSGustavo F. Padovan 25290a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 25300a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 25310a708f8fSGustavo F. Padovan 25320a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 25330a708f8fSGustavo F. Padovan 2534e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 2535e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 2536e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 2537e90165beSAndrei Emeltchenko return 0; 2538e90165beSAndrei Emeltchenko 25390a708f8fSGustavo F. Padovan del_timer(&conn->info_timer); 25400a708f8fSGustavo F. Padovan 25410a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 25420a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 25430a708f8fSGustavo F. Padovan conn->info_ident = 0; 25440a708f8fSGustavo F. Padovan 25450a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 25460a708f8fSGustavo F. Padovan 25470a708f8fSGustavo F. Padovan return 0; 25480a708f8fSGustavo F. Padovan } 25490a708f8fSGustavo F. Padovan 25500a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 25510a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 25520a708f8fSGustavo F. Padovan 25530a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 25540a708f8fSGustavo F. Padovan struct l2cap_info_req req; 25550a708f8fSGustavo F. Padovan req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 25560a708f8fSGustavo F. Padovan 25570a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 25580a708f8fSGustavo F. Padovan 25590a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 25600a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 25610a708f8fSGustavo F. Padovan } else { 25620a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 25630a708f8fSGustavo F. Padovan conn->info_ident = 0; 25640a708f8fSGustavo F. Padovan 25650a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 25660a708f8fSGustavo F. Padovan } 25670a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 25680a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 25690a708f8fSGustavo F. Padovan conn->info_ident = 0; 25700a708f8fSGustavo F. Padovan 25710a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 25720a708f8fSGustavo F. Padovan } 25730a708f8fSGustavo F. Padovan 25740a708f8fSGustavo F. Padovan return 0; 25750a708f8fSGustavo F. Padovan } 25760a708f8fSGustavo F. Padovan 2577e2174ca4SGustavo F. Padovan static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, 2578de73115aSClaudio Takahasi u16 to_multiplier) 2579de73115aSClaudio Takahasi { 2580de73115aSClaudio Takahasi u16 max_latency; 2581de73115aSClaudio Takahasi 2582de73115aSClaudio Takahasi if (min > max || min < 6 || max > 3200) 2583de73115aSClaudio Takahasi return -EINVAL; 2584de73115aSClaudio Takahasi 2585de73115aSClaudio Takahasi if (to_multiplier < 10 || to_multiplier > 3200) 2586de73115aSClaudio Takahasi return -EINVAL; 2587de73115aSClaudio Takahasi 2588de73115aSClaudio Takahasi if (max >= to_multiplier * 8) 2589de73115aSClaudio Takahasi return -EINVAL; 2590de73115aSClaudio Takahasi 2591de73115aSClaudio Takahasi max_latency = (to_multiplier * 8 / max) - 1; 2592de73115aSClaudio Takahasi if (latency > 499 || latency > max_latency) 2593de73115aSClaudio Takahasi return -EINVAL; 2594de73115aSClaudio Takahasi 2595de73115aSClaudio Takahasi return 0; 2596de73115aSClaudio Takahasi } 2597de73115aSClaudio Takahasi 2598de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 2599de73115aSClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 2600de73115aSClaudio Takahasi { 2601de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 2602de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 2603de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 2604de73115aSClaudio Takahasi u16 min, max, latency, to_multiplier, cmd_len; 26052ce603ebSClaudio Takahasi int err; 2606de73115aSClaudio Takahasi 2607de73115aSClaudio Takahasi if (!(hcon->link_mode & HCI_LM_MASTER)) 2608de73115aSClaudio Takahasi return -EINVAL; 2609de73115aSClaudio Takahasi 2610de73115aSClaudio Takahasi cmd_len = __le16_to_cpu(cmd->len); 2611de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 2612de73115aSClaudio Takahasi return -EPROTO; 2613de73115aSClaudio Takahasi 2614de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 2615de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 2616de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 2617de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 2618de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 2619de73115aSClaudio Takahasi 2620de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 2621de73115aSClaudio Takahasi min, max, latency, to_multiplier); 2622de73115aSClaudio Takahasi 2623de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 26242ce603ebSClaudio Takahasi 26252ce603ebSClaudio Takahasi err = l2cap_check_conn_param(min, max, latency, to_multiplier); 26262ce603ebSClaudio Takahasi if (err) 2627de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 2628de73115aSClaudio Takahasi else 2629de73115aSClaudio Takahasi rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 2630de73115aSClaudio Takahasi 2631de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 2632de73115aSClaudio Takahasi sizeof(rsp), &rsp); 2633de73115aSClaudio Takahasi 26342ce603ebSClaudio Takahasi if (!err) 26352ce603ebSClaudio Takahasi hci_le_conn_update(hcon, min, max, latency, to_multiplier); 26362ce603ebSClaudio Takahasi 2637de73115aSClaudio Takahasi return 0; 2638de73115aSClaudio Takahasi } 2639de73115aSClaudio Takahasi 26403300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 26413300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 26423300d9a9SClaudio Takahasi { 26433300d9a9SClaudio Takahasi int err = 0; 26443300d9a9SClaudio Takahasi 26453300d9a9SClaudio Takahasi switch (cmd->code) { 26463300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 26473300d9a9SClaudio Takahasi l2cap_command_rej(conn, cmd, data); 26483300d9a9SClaudio Takahasi break; 26493300d9a9SClaudio Takahasi 26503300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 26513300d9a9SClaudio Takahasi err = l2cap_connect_req(conn, cmd, data); 26523300d9a9SClaudio Takahasi break; 26533300d9a9SClaudio Takahasi 26543300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 26553300d9a9SClaudio Takahasi err = l2cap_connect_rsp(conn, cmd, data); 26563300d9a9SClaudio Takahasi break; 26573300d9a9SClaudio Takahasi 26583300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 26593300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 26603300d9a9SClaudio Takahasi break; 26613300d9a9SClaudio Takahasi 26623300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 26633300d9a9SClaudio Takahasi err = l2cap_config_rsp(conn, cmd, data); 26643300d9a9SClaudio Takahasi break; 26653300d9a9SClaudio Takahasi 26663300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 26673300d9a9SClaudio Takahasi err = l2cap_disconnect_req(conn, cmd, data); 26683300d9a9SClaudio Takahasi break; 26693300d9a9SClaudio Takahasi 26703300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 26713300d9a9SClaudio Takahasi err = l2cap_disconnect_rsp(conn, cmd, data); 26723300d9a9SClaudio Takahasi break; 26733300d9a9SClaudio Takahasi 26743300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 26753300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 26763300d9a9SClaudio Takahasi break; 26773300d9a9SClaudio Takahasi 26783300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 26793300d9a9SClaudio Takahasi break; 26803300d9a9SClaudio Takahasi 26813300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 26823300d9a9SClaudio Takahasi err = l2cap_information_req(conn, cmd, data); 26833300d9a9SClaudio Takahasi break; 26843300d9a9SClaudio Takahasi 26853300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 26863300d9a9SClaudio Takahasi err = l2cap_information_rsp(conn, cmd, data); 26873300d9a9SClaudio Takahasi break; 26883300d9a9SClaudio Takahasi 26893300d9a9SClaudio Takahasi default: 26903300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 26913300d9a9SClaudio Takahasi err = -EINVAL; 26923300d9a9SClaudio Takahasi break; 26933300d9a9SClaudio Takahasi } 26943300d9a9SClaudio Takahasi 26953300d9a9SClaudio Takahasi return err; 26963300d9a9SClaudio Takahasi } 26973300d9a9SClaudio Takahasi 26983300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 26993300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 27003300d9a9SClaudio Takahasi { 27013300d9a9SClaudio Takahasi switch (cmd->code) { 27023300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 27033300d9a9SClaudio Takahasi return 0; 27043300d9a9SClaudio Takahasi 27053300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 2706de73115aSClaudio Takahasi return l2cap_conn_param_update_req(conn, cmd, data); 27073300d9a9SClaudio Takahasi 27083300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 27093300d9a9SClaudio Takahasi return 0; 27103300d9a9SClaudio Takahasi 27113300d9a9SClaudio Takahasi default: 27123300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 27133300d9a9SClaudio Takahasi return -EINVAL; 27143300d9a9SClaudio Takahasi } 27153300d9a9SClaudio Takahasi } 27163300d9a9SClaudio Takahasi 27173300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 27183300d9a9SClaudio Takahasi struct sk_buff *skb) 27190a708f8fSGustavo F. Padovan { 27200a708f8fSGustavo F. Padovan u8 *data = skb->data; 27210a708f8fSGustavo F. Padovan int len = skb->len; 27220a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 27233300d9a9SClaudio Takahasi int err; 27240a708f8fSGustavo F. Padovan 27250a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 27260a708f8fSGustavo F. Padovan 27270a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 27280a708f8fSGustavo F. Padovan u16 cmd_len; 27290a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 27300a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 27310a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 27320a708f8fSGustavo F. Padovan 27330a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 27340a708f8fSGustavo F. Padovan 27350a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); 27360a708f8fSGustavo F. Padovan 27370a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 27380a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 27390a708f8fSGustavo F. Padovan break; 27400a708f8fSGustavo F. Padovan } 27410a708f8fSGustavo F. Padovan 27423300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 27433300d9a9SClaudio Takahasi err = l2cap_le_sig_cmd(conn, &cmd, data); 27443300d9a9SClaudio Takahasi else 27453300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 27460a708f8fSGustavo F. Padovan 27470a708f8fSGustavo F. Padovan if (err) { 27480a708f8fSGustavo F. Padovan struct l2cap_cmd_rej rej; 27492c6d1a2eSGustavo F. Padovan 27502c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 27510a708f8fSGustavo F. Padovan 27520a708f8fSGustavo F. Padovan /* FIXME: Map err to a valid reason */ 27530a708f8fSGustavo F. Padovan rej.reason = cpu_to_le16(0); 27540a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); 27550a708f8fSGustavo F. Padovan } 27560a708f8fSGustavo F. Padovan 27570a708f8fSGustavo F. Padovan data += cmd_len; 27580a708f8fSGustavo F. Padovan len -= cmd_len; 27590a708f8fSGustavo F. Padovan } 27600a708f8fSGustavo F. Padovan 27610a708f8fSGustavo F. Padovan kfree_skb(skb); 27620a708f8fSGustavo F. Padovan } 27630a708f8fSGustavo F. Padovan 27640a708f8fSGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) 27650a708f8fSGustavo F. Padovan { 27660a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 27670a708f8fSGustavo F. Padovan int hdr_size = L2CAP_HDR_SIZE + 2; 27680a708f8fSGustavo F. Padovan 27690a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) { 27700a708f8fSGustavo F. Padovan skb_trim(skb, skb->len - 2); 27710a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 27720a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 27730a708f8fSGustavo F. Padovan 27740a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 27750a708f8fSGustavo F. Padovan return -EBADMSG; 27760a708f8fSGustavo F. Padovan } 27770a708f8fSGustavo F. Padovan return 0; 27780a708f8fSGustavo F. Padovan } 27790a708f8fSGustavo F. Padovan 27800a708f8fSGustavo F. Padovan static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) 27810a708f8fSGustavo F. Padovan { 27820a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 27830a708f8fSGustavo F. Padovan u16 control = 0; 27840a708f8fSGustavo F. Padovan 27850a708f8fSGustavo F. Padovan pi->frames_sent = 0; 27860a708f8fSGustavo F. Padovan 27870a708f8fSGustavo F. Padovan control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 27880a708f8fSGustavo F. Padovan 27890a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { 27900a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_NOT_READY; 27910a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 27920a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_RNR_SENT; 27930a708f8fSGustavo F. Padovan } 27940a708f8fSGustavo F. Padovan 27950a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) 27960a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 27970a708f8fSGustavo F. Padovan 27980a708f8fSGustavo F. Padovan l2cap_ertm_send(sk); 27990a708f8fSGustavo F. Padovan 28000a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && 28010a708f8fSGustavo F. Padovan pi->frames_sent == 0) { 28020a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY; 28030a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 28040a708f8fSGustavo F. Padovan } 28050a708f8fSGustavo F. Padovan } 28060a708f8fSGustavo F. Padovan 28070a708f8fSGustavo F. Padovan static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) 28080a708f8fSGustavo F. Padovan { 28090a708f8fSGustavo F. Padovan struct sk_buff *next_skb; 28100a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 28110a708f8fSGustavo F. Padovan int tx_seq_offset, next_tx_seq_offset; 28120a708f8fSGustavo F. Padovan 28130a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 28140a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 28150a708f8fSGustavo F. Padovan 28160a708f8fSGustavo F. Padovan next_skb = skb_peek(SREJ_QUEUE(sk)); 28170a708f8fSGustavo F. Padovan if (!next_skb) { 28180a708f8fSGustavo F. Padovan __skb_queue_tail(SREJ_QUEUE(sk), skb); 28190a708f8fSGustavo F. Padovan return 0; 28200a708f8fSGustavo F. Padovan } 28210a708f8fSGustavo F. Padovan 28220a708f8fSGustavo F. Padovan tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; 28230a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 28240a708f8fSGustavo F. Padovan tx_seq_offset += 64; 28250a708f8fSGustavo F. Padovan 28260a708f8fSGustavo F. Padovan do { 28270a708f8fSGustavo F. Padovan if (bt_cb(next_skb)->tx_seq == tx_seq) 28280a708f8fSGustavo F. Padovan return -EINVAL; 28290a708f8fSGustavo F. Padovan 28300a708f8fSGustavo F. Padovan next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - 28310a708f8fSGustavo F. Padovan pi->buffer_seq) % 64; 28320a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 28330a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 28340a708f8fSGustavo F. Padovan 28350a708f8fSGustavo F. Padovan if (next_tx_seq_offset > tx_seq_offset) { 28360a708f8fSGustavo F. Padovan __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); 28370a708f8fSGustavo F. Padovan return 0; 28380a708f8fSGustavo F. Padovan } 28390a708f8fSGustavo F. Padovan 28400a708f8fSGustavo F. Padovan if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) 28410a708f8fSGustavo F. Padovan break; 28420a708f8fSGustavo F. Padovan 28430a708f8fSGustavo F. Padovan } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); 28440a708f8fSGustavo F. Padovan 28450a708f8fSGustavo F. Padovan __skb_queue_tail(SREJ_QUEUE(sk), skb); 28460a708f8fSGustavo F. Padovan 28470a708f8fSGustavo F. Padovan return 0; 28480a708f8fSGustavo F. Padovan } 28490a708f8fSGustavo F. Padovan 28500a708f8fSGustavo F. Padovan static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) 28510a708f8fSGustavo F. Padovan { 28520a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 28530a708f8fSGustavo F. Padovan struct sk_buff *_skb; 28540a708f8fSGustavo F. Padovan int err; 28550a708f8fSGustavo F. Padovan 28560a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 28570a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 28580a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SAR_SDU) 28590a708f8fSGustavo F. Padovan goto drop; 28600a708f8fSGustavo F. Padovan 28610a708f8fSGustavo F. Padovan err = sock_queue_rcv_skb(sk, skb); 28620a708f8fSGustavo F. Padovan if (!err) 28630a708f8fSGustavo F. Padovan return err; 28640a708f8fSGustavo F. Padovan 28650a708f8fSGustavo F. Padovan break; 28660a708f8fSGustavo F. Padovan 28670a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 28680a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SAR_SDU) 28690a708f8fSGustavo F. Padovan goto drop; 28700a708f8fSGustavo F. Padovan 28710a708f8fSGustavo F. Padovan pi->sdu_len = get_unaligned_le16(skb->data); 28720a708f8fSGustavo F. Padovan 28730a708f8fSGustavo F. Padovan if (pi->sdu_len > pi->imtu) 28740a708f8fSGustavo F. Padovan goto disconnect; 28750a708f8fSGustavo F. Padovan 28760a708f8fSGustavo F. Padovan pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); 28770a708f8fSGustavo F. Padovan if (!pi->sdu) 28780a708f8fSGustavo F. Padovan return -ENOMEM; 28790a708f8fSGustavo F. Padovan 28800a708f8fSGustavo F. Padovan /* pull sdu_len bytes only after alloc, because of Local Busy 28810a708f8fSGustavo F. Padovan * condition we have to be sure that this will be executed 28820a708f8fSGustavo F. Padovan * only once, i.e., when alloc does not fail */ 28830a708f8fSGustavo F. Padovan skb_pull(skb, 2); 28840a708f8fSGustavo F. Padovan 28850a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 28860a708f8fSGustavo F. Padovan 28870a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SAR_SDU; 28880a708f8fSGustavo F. Padovan pi->partial_sdu_len = skb->len; 28890a708f8fSGustavo F. Padovan break; 28900a708f8fSGustavo F. Padovan 28910a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 28920a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) 28930a708f8fSGustavo F. Padovan goto disconnect; 28940a708f8fSGustavo F. Padovan 28950a708f8fSGustavo F. Padovan if (!pi->sdu) 28960a708f8fSGustavo F. Padovan goto disconnect; 28970a708f8fSGustavo F. Padovan 28980a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 28990a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->sdu_len) 29000a708f8fSGustavo F. Padovan goto drop; 29010a708f8fSGustavo F. Padovan 29020a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 29030a708f8fSGustavo F. Padovan 29040a708f8fSGustavo F. Padovan break; 29050a708f8fSGustavo F. Padovan 29060a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 29070a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) 29080a708f8fSGustavo F. Padovan goto disconnect; 29090a708f8fSGustavo F. Padovan 29100a708f8fSGustavo F. Padovan if (!pi->sdu) 29110a708f8fSGustavo F. Padovan goto disconnect; 29120a708f8fSGustavo F. Padovan 29130a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { 29140a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 29150a708f8fSGustavo F. Padovan 29160a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->imtu) 29170a708f8fSGustavo F. Padovan goto drop; 29180a708f8fSGustavo F. Padovan 29190a708f8fSGustavo F. Padovan if (pi->partial_sdu_len != pi->sdu_len) 29200a708f8fSGustavo F. Padovan goto drop; 29210a708f8fSGustavo F. Padovan 29220a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 29230a708f8fSGustavo F. Padovan } 29240a708f8fSGustavo F. Padovan 29250a708f8fSGustavo F. Padovan _skb = skb_clone(pi->sdu, GFP_ATOMIC); 29260a708f8fSGustavo F. Padovan if (!_skb) { 29270a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SAR_RETRY; 29280a708f8fSGustavo F. Padovan return -ENOMEM; 29290a708f8fSGustavo F. Padovan } 29300a708f8fSGustavo F. Padovan 29310a708f8fSGustavo F. Padovan err = sock_queue_rcv_skb(sk, _skb); 29320a708f8fSGustavo F. Padovan if (err < 0) { 29330a708f8fSGustavo F. Padovan kfree_skb(_skb); 29340a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SAR_RETRY; 29350a708f8fSGustavo F. Padovan return err; 29360a708f8fSGustavo F. Padovan } 29370a708f8fSGustavo F. Padovan 29380a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; 29390a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SAR_SDU; 29400a708f8fSGustavo F. Padovan 29410a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 29420a708f8fSGustavo F. Padovan break; 29430a708f8fSGustavo F. Padovan } 29440a708f8fSGustavo F. Padovan 29450a708f8fSGustavo F. Padovan kfree_skb(skb); 29460a708f8fSGustavo F. Padovan return 0; 29470a708f8fSGustavo F. Padovan 29480a708f8fSGustavo F. Padovan drop: 29490a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 29500a708f8fSGustavo F. Padovan pi->sdu = NULL; 29510a708f8fSGustavo F. Padovan 29520a708f8fSGustavo F. Padovan disconnect: 29530a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 29540a708f8fSGustavo F. Padovan kfree_skb(skb); 29550a708f8fSGustavo F. Padovan return 0; 29560a708f8fSGustavo F. Padovan } 29570a708f8fSGustavo F. Padovan 29580a708f8fSGustavo F. Padovan static int l2cap_try_push_rx_skb(struct sock *sk) 29590a708f8fSGustavo F. Padovan { 29600a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 29610a708f8fSGustavo F. Padovan struct sk_buff *skb; 29620a708f8fSGustavo F. Padovan u16 control; 29630a708f8fSGustavo F. Padovan int err; 29640a708f8fSGustavo F. Padovan 29650a708f8fSGustavo F. Padovan while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { 29660a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 29670a708f8fSGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(sk, skb, control); 29680a708f8fSGustavo F. Padovan if (err < 0) { 29690a708f8fSGustavo F. Padovan skb_queue_head(BUSY_QUEUE(sk), skb); 29700a708f8fSGustavo F. Padovan return -EBUSY; 29710a708f8fSGustavo F. Padovan } 29720a708f8fSGustavo F. Padovan 29730a708f8fSGustavo F. Padovan pi->buffer_seq = (pi->buffer_seq + 1) % 64; 29740a708f8fSGustavo F. Padovan } 29750a708f8fSGustavo F. Padovan 29760a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) 29770a708f8fSGustavo F. Padovan goto done; 29780a708f8fSGustavo F. Padovan 29790a708f8fSGustavo F. Padovan control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 29800a708f8fSGustavo F. Padovan control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; 29810a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 29820a708f8fSGustavo F. Padovan l2cap_pi(sk)->retry_count = 1; 29830a708f8fSGustavo F. Padovan 29840a708f8fSGustavo F. Padovan del_timer(&pi->retrans_timer); 29850a708f8fSGustavo F. Padovan __mod_monitor_timer(); 29860a708f8fSGustavo F. Padovan 29870a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; 29880a708f8fSGustavo F. Padovan 29890a708f8fSGustavo F. Padovan done: 29900a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; 29910a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_RNR_SENT; 29920a708f8fSGustavo F. Padovan 29930a708f8fSGustavo F. Padovan BT_DBG("sk %p, Exit local busy", sk); 29940a708f8fSGustavo F. Padovan 29950a708f8fSGustavo F. Padovan return 0; 29960a708f8fSGustavo F. Padovan } 29970a708f8fSGustavo F. Padovan 29980a708f8fSGustavo F. Padovan static void l2cap_busy_work(struct work_struct *work) 29990a708f8fSGustavo F. Padovan { 30000a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 30010a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = 30020a708f8fSGustavo F. Padovan container_of(work, struct l2cap_pinfo, busy_work); 30030a708f8fSGustavo F. Padovan struct sock *sk = (struct sock *)pi; 30040a708f8fSGustavo F. Padovan int n_tries = 0, timeo = HZ/5, err; 30050a708f8fSGustavo F. Padovan struct sk_buff *skb; 30060a708f8fSGustavo F. Padovan 30070a708f8fSGustavo F. Padovan lock_sock(sk); 30080a708f8fSGustavo F. Padovan 30090a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 30100a708f8fSGustavo F. Padovan while ((skb = skb_peek(BUSY_QUEUE(sk)))) { 30110a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 30120a708f8fSGustavo F. Padovan 30130a708f8fSGustavo F. Padovan if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { 30140a708f8fSGustavo F. Padovan err = -EBUSY; 30150a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, EBUSY); 30160a708f8fSGustavo F. Padovan break; 30170a708f8fSGustavo F. Padovan } 30180a708f8fSGustavo F. Padovan 30190a708f8fSGustavo F. Padovan if (!timeo) 30200a708f8fSGustavo F. Padovan timeo = HZ/5; 30210a708f8fSGustavo F. Padovan 30220a708f8fSGustavo F. Padovan if (signal_pending(current)) { 30230a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 30240a708f8fSGustavo F. Padovan break; 30250a708f8fSGustavo F. Padovan } 30260a708f8fSGustavo F. Padovan 30270a708f8fSGustavo F. Padovan release_sock(sk); 30280a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 30290a708f8fSGustavo F. Padovan lock_sock(sk); 30300a708f8fSGustavo F. Padovan 30310a708f8fSGustavo F. Padovan err = sock_error(sk); 30320a708f8fSGustavo F. Padovan if (err) 30330a708f8fSGustavo F. Padovan break; 30340a708f8fSGustavo F. Padovan 30350a708f8fSGustavo F. Padovan if (l2cap_try_push_rx_skb(sk) == 0) 30360a708f8fSGustavo F. Padovan break; 30370a708f8fSGustavo F. Padovan } 30380a708f8fSGustavo F. Padovan 30390a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 30400a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 30410a708f8fSGustavo F. Padovan 30420a708f8fSGustavo F. Padovan release_sock(sk); 30430a708f8fSGustavo F. Padovan } 30440a708f8fSGustavo F. Padovan 30450a708f8fSGustavo F. Padovan static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) 30460a708f8fSGustavo F. Padovan { 30470a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 30480a708f8fSGustavo F. Padovan int sctrl, err; 30490a708f8fSGustavo F. Padovan 30500a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { 30510a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 30520a708f8fSGustavo F. Padovan __skb_queue_tail(BUSY_QUEUE(sk), skb); 30530a708f8fSGustavo F. Padovan return l2cap_try_push_rx_skb(sk); 30540a708f8fSGustavo F. Padovan 30550a708f8fSGustavo F. Padovan 30560a708f8fSGustavo F. Padovan } 30570a708f8fSGustavo F. Padovan 30580a708f8fSGustavo F. Padovan err = l2cap_ertm_reassembly_sdu(sk, skb, control); 30590a708f8fSGustavo F. Padovan if (err >= 0) { 30600a708f8fSGustavo F. Padovan pi->buffer_seq = (pi->buffer_seq + 1) % 64; 30610a708f8fSGustavo F. Padovan return err; 30620a708f8fSGustavo F. Padovan } 30630a708f8fSGustavo F. Padovan 30640a708f8fSGustavo F. Padovan /* Busy Condition */ 30650a708f8fSGustavo F. Padovan BT_DBG("sk %p, Enter local busy", sk); 30660a708f8fSGustavo F. Padovan 30670a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; 30680a708f8fSGustavo F. Padovan bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; 30690a708f8fSGustavo F. Padovan __skb_queue_tail(BUSY_QUEUE(sk), skb); 30700a708f8fSGustavo F. Padovan 30710a708f8fSGustavo F. Padovan sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; 30720a708f8fSGustavo F. Padovan sctrl |= L2CAP_SUPER_RCV_NOT_READY; 30730a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, sctrl); 30740a708f8fSGustavo F. Padovan 30750a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_RNR_SENT; 30760a708f8fSGustavo F. Padovan 30770a708f8fSGustavo F. Padovan del_timer(&pi->ack_timer); 30780a708f8fSGustavo F. Padovan 30790a708f8fSGustavo F. Padovan queue_work(_busy_wq, &pi->busy_work); 30800a708f8fSGustavo F. Padovan 30810a708f8fSGustavo F. Padovan return err; 30820a708f8fSGustavo F. Padovan } 30830a708f8fSGustavo F. Padovan 30840a708f8fSGustavo F. Padovan static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) 30850a708f8fSGustavo F. Padovan { 30860a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 30870a708f8fSGustavo F. Padovan struct sk_buff *_skb; 30880a708f8fSGustavo F. Padovan int err = -EINVAL; 30890a708f8fSGustavo F. Padovan 30900a708f8fSGustavo F. Padovan /* 30910a708f8fSGustavo F. Padovan * TODO: We have to notify the userland if some data is lost with the 30920a708f8fSGustavo F. Padovan * Streaming Mode. 30930a708f8fSGustavo F. Padovan */ 30940a708f8fSGustavo F. Padovan 30950a708f8fSGustavo F. Padovan switch (control & L2CAP_CTRL_SAR) { 30960a708f8fSGustavo F. Padovan case L2CAP_SDU_UNSEGMENTED: 30970a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SAR_SDU) { 30980a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 30990a708f8fSGustavo F. Padovan break; 31000a708f8fSGustavo F. Padovan } 31010a708f8fSGustavo F. Padovan 31020a708f8fSGustavo F. Padovan err = sock_queue_rcv_skb(sk, skb); 31030a708f8fSGustavo F. Padovan if (!err) 31040a708f8fSGustavo F. Padovan return 0; 31050a708f8fSGustavo F. Padovan 31060a708f8fSGustavo F. Padovan break; 31070a708f8fSGustavo F. Padovan 31080a708f8fSGustavo F. Padovan case L2CAP_SDU_START: 31090a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SAR_SDU) { 31100a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 31110a708f8fSGustavo F. Padovan break; 31120a708f8fSGustavo F. Padovan } 31130a708f8fSGustavo F. Padovan 31140a708f8fSGustavo F. Padovan pi->sdu_len = get_unaligned_le16(skb->data); 31150a708f8fSGustavo F. Padovan skb_pull(skb, 2); 31160a708f8fSGustavo F. Padovan 31170a708f8fSGustavo F. Padovan if (pi->sdu_len > pi->imtu) { 31180a708f8fSGustavo F. Padovan err = -EMSGSIZE; 31190a708f8fSGustavo F. Padovan break; 31200a708f8fSGustavo F. Padovan } 31210a708f8fSGustavo F. Padovan 31220a708f8fSGustavo F. Padovan pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); 31230a708f8fSGustavo F. Padovan if (!pi->sdu) { 31240a708f8fSGustavo F. Padovan err = -ENOMEM; 31250a708f8fSGustavo F. Padovan break; 31260a708f8fSGustavo F. Padovan } 31270a708f8fSGustavo F. Padovan 31280a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 31290a708f8fSGustavo F. Padovan 31300a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SAR_SDU; 31310a708f8fSGustavo F. Padovan pi->partial_sdu_len = skb->len; 31320a708f8fSGustavo F. Padovan err = 0; 31330a708f8fSGustavo F. Padovan break; 31340a708f8fSGustavo F. Padovan 31350a708f8fSGustavo F. Padovan case L2CAP_SDU_CONTINUE: 31360a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) 31370a708f8fSGustavo F. Padovan break; 31380a708f8fSGustavo F. Padovan 31390a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 31400a708f8fSGustavo F. Padovan 31410a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 31420a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->sdu_len) 31430a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 31440a708f8fSGustavo F. Padovan else 31450a708f8fSGustavo F. Padovan err = 0; 31460a708f8fSGustavo F. Padovan 31470a708f8fSGustavo F. Padovan break; 31480a708f8fSGustavo F. Padovan 31490a708f8fSGustavo F. Padovan case L2CAP_SDU_END: 31500a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) 31510a708f8fSGustavo F. Padovan break; 31520a708f8fSGustavo F. Padovan 31530a708f8fSGustavo F. Padovan memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); 31540a708f8fSGustavo F. Padovan 31550a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SAR_SDU; 31560a708f8fSGustavo F. Padovan pi->partial_sdu_len += skb->len; 31570a708f8fSGustavo F. Padovan 31580a708f8fSGustavo F. Padovan if (pi->partial_sdu_len > pi->imtu) 31590a708f8fSGustavo F. Padovan goto drop; 31600a708f8fSGustavo F. Padovan 31610a708f8fSGustavo F. Padovan if (pi->partial_sdu_len == pi->sdu_len) { 31620a708f8fSGustavo F. Padovan _skb = skb_clone(pi->sdu, GFP_ATOMIC); 31630a708f8fSGustavo F. Padovan err = sock_queue_rcv_skb(sk, _skb); 31640a708f8fSGustavo F. Padovan if (err < 0) 31650a708f8fSGustavo F. Padovan kfree_skb(_skb); 31660a708f8fSGustavo F. Padovan } 31670a708f8fSGustavo F. Padovan err = 0; 31680a708f8fSGustavo F. Padovan 31690a708f8fSGustavo F. Padovan drop: 31700a708f8fSGustavo F. Padovan kfree_skb(pi->sdu); 31710a708f8fSGustavo F. Padovan break; 31720a708f8fSGustavo F. Padovan } 31730a708f8fSGustavo F. Padovan 31740a708f8fSGustavo F. Padovan kfree_skb(skb); 31750a708f8fSGustavo F. Padovan return err; 31760a708f8fSGustavo F. Padovan } 31770a708f8fSGustavo F. Padovan 31780a708f8fSGustavo F. Padovan static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) 31790a708f8fSGustavo F. Padovan { 31800a708f8fSGustavo F. Padovan struct sk_buff *skb; 31810a708f8fSGustavo F. Padovan u16 control; 31820a708f8fSGustavo F. Padovan 31830a708f8fSGustavo F. Padovan while ((skb = skb_peek(SREJ_QUEUE(sk)))) { 31840a708f8fSGustavo F. Padovan if (bt_cb(skb)->tx_seq != tx_seq) 31850a708f8fSGustavo F. Padovan break; 31860a708f8fSGustavo F. Padovan 31870a708f8fSGustavo F. Padovan skb = skb_dequeue(SREJ_QUEUE(sk)); 31880a708f8fSGustavo F. Padovan control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; 31890a708f8fSGustavo F. Padovan l2cap_ertm_reassembly_sdu(sk, skb, control); 31900a708f8fSGustavo F. Padovan l2cap_pi(sk)->buffer_seq_srej = 31910a708f8fSGustavo F. Padovan (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; 31920a708f8fSGustavo F. Padovan tx_seq = (tx_seq + 1) % 64; 31930a708f8fSGustavo F. Padovan } 31940a708f8fSGustavo F. Padovan } 31950a708f8fSGustavo F. Padovan 31960a708f8fSGustavo F. Padovan static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) 31970a708f8fSGustavo F. Padovan { 31980a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 31990a708f8fSGustavo F. Padovan struct srej_list *l, *tmp; 32000a708f8fSGustavo F. Padovan u16 control; 32010a708f8fSGustavo F. Padovan 32020a708f8fSGustavo F. Padovan list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { 32030a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 32040a708f8fSGustavo F. Padovan list_del(&l->list); 32050a708f8fSGustavo F. Padovan kfree(l); 32060a708f8fSGustavo F. Padovan return; 32070a708f8fSGustavo F. Padovan } 32080a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 32090a708f8fSGustavo F. Padovan control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 32100a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 32110a708f8fSGustavo F. Padovan list_del(&l->list); 32120a708f8fSGustavo F. Padovan list_add_tail(&l->list, SREJ_LIST(sk)); 32130a708f8fSGustavo F. Padovan } 32140a708f8fSGustavo F. Padovan } 32150a708f8fSGustavo F. Padovan 32160a708f8fSGustavo F. Padovan static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) 32170a708f8fSGustavo F. Padovan { 32180a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 32190a708f8fSGustavo F. Padovan struct srej_list *new; 32200a708f8fSGustavo F. Padovan u16 control; 32210a708f8fSGustavo F. Padovan 32220a708f8fSGustavo F. Padovan while (tx_seq != pi->expected_tx_seq) { 32230a708f8fSGustavo F. Padovan control = L2CAP_SUPER_SELECT_REJECT; 32240a708f8fSGustavo F. Padovan control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; 32250a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, control); 32260a708f8fSGustavo F. Padovan 32270a708f8fSGustavo F. Padovan new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); 32280a708f8fSGustavo F. Padovan new->tx_seq = pi->expected_tx_seq; 32290a708f8fSGustavo F. Padovan pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; 32300a708f8fSGustavo F. Padovan list_add_tail(&new->list, SREJ_LIST(sk)); 32310a708f8fSGustavo F. Padovan } 32320a708f8fSGustavo F. Padovan pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; 32330a708f8fSGustavo F. Padovan } 32340a708f8fSGustavo F. Padovan 32350a708f8fSGustavo F. Padovan static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) 32360a708f8fSGustavo F. Padovan { 32370a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 32380a708f8fSGustavo F. Padovan u8 tx_seq = __get_txseq(rx_control); 32390a708f8fSGustavo F. Padovan u8 req_seq = __get_reqseq(rx_control); 32400a708f8fSGustavo F. Padovan u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; 32410a708f8fSGustavo F. Padovan int tx_seq_offset, expected_tx_seq_offset; 32420a708f8fSGustavo F. Padovan int num_to_ack = (pi->tx_win/6) + 1; 32430a708f8fSGustavo F. Padovan int err = 0; 32440a708f8fSGustavo F. Padovan 32450a708f8fSGustavo F. Padovan BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, 32460a708f8fSGustavo F. Padovan rx_control); 32470a708f8fSGustavo F. Padovan 32480a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 32490a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { 32500a708f8fSGustavo F. Padovan del_timer(&pi->monitor_timer); 32510a708f8fSGustavo F. Padovan if (pi->unacked_frames > 0) 32520a708f8fSGustavo F. Padovan __mod_retrans_timer(); 32530a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_WAIT_F; 32540a708f8fSGustavo F. Padovan } 32550a708f8fSGustavo F. Padovan 32560a708f8fSGustavo F. Padovan pi->expected_ack_seq = req_seq; 32570a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 32580a708f8fSGustavo F. Padovan 32590a708f8fSGustavo F. Padovan if (tx_seq == pi->expected_tx_seq) 32600a708f8fSGustavo F. Padovan goto expected; 32610a708f8fSGustavo F. Padovan 32620a708f8fSGustavo F. Padovan tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; 32630a708f8fSGustavo F. Padovan if (tx_seq_offset < 0) 32640a708f8fSGustavo F. Padovan tx_seq_offset += 64; 32650a708f8fSGustavo F. Padovan 32660a708f8fSGustavo F. Padovan /* invalid tx_seq */ 32670a708f8fSGustavo F. Padovan if (tx_seq_offset >= pi->tx_win) { 32680a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 32690a708f8fSGustavo F. Padovan goto drop; 32700a708f8fSGustavo F. Padovan } 32710a708f8fSGustavo F. Padovan 32720a708f8fSGustavo F. Padovan if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) 32730a708f8fSGustavo F. Padovan goto drop; 32740a708f8fSGustavo F. Padovan 32750a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { 32760a708f8fSGustavo F. Padovan struct srej_list *first; 32770a708f8fSGustavo F. Padovan 32780a708f8fSGustavo F. Padovan first = list_first_entry(SREJ_LIST(sk), 32790a708f8fSGustavo F. Padovan struct srej_list, list); 32800a708f8fSGustavo F. Padovan if (tx_seq == first->tx_seq) { 32810a708f8fSGustavo F. Padovan l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); 32820a708f8fSGustavo F. Padovan l2cap_check_srej_gap(sk, tx_seq); 32830a708f8fSGustavo F. Padovan 32840a708f8fSGustavo F. Padovan list_del(&first->list); 32850a708f8fSGustavo F. Padovan kfree(first); 32860a708f8fSGustavo F. Padovan 32870a708f8fSGustavo F. Padovan if (list_empty(SREJ_LIST(sk))) { 32880a708f8fSGustavo F. Padovan pi->buffer_seq = pi->buffer_seq_srej; 32890a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; 32900a708f8fSGustavo F. Padovan l2cap_send_ack(pi); 32910a708f8fSGustavo F. Padovan BT_DBG("sk %p, Exit SREJ_SENT", sk); 32920a708f8fSGustavo F. Padovan } 32930a708f8fSGustavo F. Padovan } else { 32940a708f8fSGustavo F. Padovan struct srej_list *l; 32950a708f8fSGustavo F. Padovan 32960a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 32970a708f8fSGustavo F. Padovan if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) 32980a708f8fSGustavo F. Padovan goto drop; 32990a708f8fSGustavo F. Padovan 33000a708f8fSGustavo F. Padovan list_for_each_entry(l, SREJ_LIST(sk), list) { 33010a708f8fSGustavo F. Padovan if (l->tx_seq == tx_seq) { 33020a708f8fSGustavo F. Padovan l2cap_resend_srejframe(sk, tx_seq); 33030a708f8fSGustavo F. Padovan return 0; 33040a708f8fSGustavo F. Padovan } 33050a708f8fSGustavo F. Padovan } 33060a708f8fSGustavo F. Padovan l2cap_send_srejframe(sk, tx_seq); 33070a708f8fSGustavo F. Padovan } 33080a708f8fSGustavo F. Padovan } else { 33090a708f8fSGustavo F. Padovan expected_tx_seq_offset = 33100a708f8fSGustavo F. Padovan (pi->expected_tx_seq - pi->buffer_seq) % 64; 33110a708f8fSGustavo F. Padovan if (expected_tx_seq_offset < 0) 33120a708f8fSGustavo F. Padovan expected_tx_seq_offset += 64; 33130a708f8fSGustavo F. Padovan 33140a708f8fSGustavo F. Padovan /* duplicated tx_seq */ 33150a708f8fSGustavo F. Padovan if (tx_seq_offset < expected_tx_seq_offset) 33160a708f8fSGustavo F. Padovan goto drop; 33170a708f8fSGustavo F. Padovan 33180a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SREJ_SENT; 33190a708f8fSGustavo F. Padovan 33200a708f8fSGustavo F. Padovan BT_DBG("sk %p, Enter SREJ", sk); 33210a708f8fSGustavo F. Padovan 33220a708f8fSGustavo F. Padovan INIT_LIST_HEAD(SREJ_LIST(sk)); 33230a708f8fSGustavo F. Padovan pi->buffer_seq_srej = pi->buffer_seq; 33240a708f8fSGustavo F. Padovan 33250a708f8fSGustavo F. Padovan __skb_queue_head_init(SREJ_QUEUE(sk)); 33260a708f8fSGustavo F. Padovan __skb_queue_head_init(BUSY_QUEUE(sk)); 33270a708f8fSGustavo F. Padovan l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); 33280a708f8fSGustavo F. Padovan 33290a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SEND_PBIT; 33300a708f8fSGustavo F. Padovan 33310a708f8fSGustavo F. Padovan l2cap_send_srejframe(sk, tx_seq); 33320a708f8fSGustavo F. Padovan 33330a708f8fSGustavo F. Padovan del_timer(&pi->ack_timer); 33340a708f8fSGustavo F. Padovan } 33350a708f8fSGustavo F. Padovan return 0; 33360a708f8fSGustavo F. Padovan 33370a708f8fSGustavo F. Padovan expected: 33380a708f8fSGustavo F. Padovan pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; 33390a708f8fSGustavo F. Padovan 33400a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { 33410a708f8fSGustavo F. Padovan bt_cb(skb)->tx_seq = tx_seq; 33420a708f8fSGustavo F. Padovan bt_cb(skb)->sar = sar; 33430a708f8fSGustavo F. Padovan __skb_queue_tail(SREJ_QUEUE(sk), skb); 33440a708f8fSGustavo F. Padovan return 0; 33450a708f8fSGustavo F. Padovan } 33460a708f8fSGustavo F. Padovan 33470a708f8fSGustavo F. Padovan err = l2cap_push_rx_skb(sk, skb, rx_control); 33480a708f8fSGustavo F. Padovan if (err < 0) 33490a708f8fSGustavo F. Padovan return 0; 33500a708f8fSGustavo F. Padovan 33510a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 33520a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_REJ_ACT) 33530a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REJ_ACT; 33540a708f8fSGustavo F. Padovan else 33550a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 33560a708f8fSGustavo F. Padovan } 33570a708f8fSGustavo F. Padovan 33580a708f8fSGustavo F. Padovan __mod_ack_timer(); 33590a708f8fSGustavo F. Padovan 33600a708f8fSGustavo F. Padovan pi->num_acked = (pi->num_acked + 1) % num_to_ack; 33610a708f8fSGustavo F. Padovan if (pi->num_acked == num_to_ack - 1) 33620a708f8fSGustavo F. Padovan l2cap_send_ack(pi); 33630a708f8fSGustavo F. Padovan 33640a708f8fSGustavo F. Padovan return 0; 33650a708f8fSGustavo F. Padovan 33660a708f8fSGustavo F. Padovan drop: 33670a708f8fSGustavo F. Padovan kfree_skb(skb); 33680a708f8fSGustavo F. Padovan return 0; 33690a708f8fSGustavo F. Padovan } 33700a708f8fSGustavo F. Padovan 33710a708f8fSGustavo F. Padovan static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) 33720a708f8fSGustavo F. Padovan { 33730a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 33740a708f8fSGustavo F. Padovan 33750a708f8fSGustavo F. Padovan BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), 33760a708f8fSGustavo F. Padovan rx_control); 33770a708f8fSGustavo F. Padovan 33780a708f8fSGustavo F. Padovan pi->expected_ack_seq = __get_reqseq(rx_control); 33790a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 33800a708f8fSGustavo F. Padovan 33810a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 33820a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SEND_FBIT; 33830a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { 33840a708f8fSGustavo F. Padovan if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && 33850a708f8fSGustavo F. Padovan (pi->unacked_frames > 0)) 33860a708f8fSGustavo F. Padovan __mod_retrans_timer(); 33870a708f8fSGustavo F. Padovan 33880a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 33890a708f8fSGustavo F. Padovan l2cap_send_srejtail(sk); 33900a708f8fSGustavo F. Padovan } else { 33910a708f8fSGustavo F. Padovan l2cap_send_i_or_rr_or_rnr(sk); 33920a708f8fSGustavo F. Padovan } 33930a708f8fSGustavo F. Padovan 33940a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 33950a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 33960a708f8fSGustavo F. Padovan 33970a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_REJ_ACT) 33980a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REJ_ACT; 33990a708f8fSGustavo F. Padovan else 34000a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 34010a708f8fSGustavo F. Padovan 34020a708f8fSGustavo F. Padovan } else { 34030a708f8fSGustavo F. Padovan if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && 34040a708f8fSGustavo F. Padovan (pi->unacked_frames > 0)) 34050a708f8fSGustavo F. Padovan __mod_retrans_timer(); 34060a708f8fSGustavo F. Padovan 34070a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 34080a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_SREJ_SENT) 34090a708f8fSGustavo F. Padovan l2cap_send_ack(pi); 34100a708f8fSGustavo F. Padovan else 34110a708f8fSGustavo F. Padovan l2cap_ertm_send(sk); 34120a708f8fSGustavo F. Padovan } 34130a708f8fSGustavo F. Padovan } 34140a708f8fSGustavo F. Padovan 34150a708f8fSGustavo F. Padovan static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) 34160a708f8fSGustavo F. Padovan { 34170a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 34180a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 34190a708f8fSGustavo F. Padovan 34200a708f8fSGustavo F. Padovan BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); 34210a708f8fSGustavo F. Padovan 34220a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 34230a708f8fSGustavo F. Padovan 34240a708f8fSGustavo F. Padovan pi->expected_ack_seq = tx_seq; 34250a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 34260a708f8fSGustavo F. Padovan 34270a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_FINAL) { 34280a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_REJ_ACT) 34290a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REJ_ACT; 34300a708f8fSGustavo F. Padovan else 34310a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 34320a708f8fSGustavo F. Padovan } else { 34330a708f8fSGustavo F. Padovan l2cap_retransmit_frames(sk); 34340a708f8fSGustavo F. Padovan 34350a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_WAIT_F) 34360a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_REJ_ACT; 34370a708f8fSGustavo F. Padovan } 34380a708f8fSGustavo F. Padovan } 34390a708f8fSGustavo F. Padovan static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) 34400a708f8fSGustavo F. Padovan { 34410a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 34420a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 34430a708f8fSGustavo F. Padovan 34440a708f8fSGustavo F. Padovan BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); 34450a708f8fSGustavo F. Padovan 34460a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; 34470a708f8fSGustavo F. Padovan 34480a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) { 34490a708f8fSGustavo F. Padovan pi->expected_ack_seq = tx_seq; 34500a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 34510a708f8fSGustavo F. Padovan 34520a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SEND_FBIT; 34530a708f8fSGustavo F. Padovan l2cap_retransmit_one_frame(sk, tx_seq); 34540a708f8fSGustavo F. Padovan 34550a708f8fSGustavo F. Padovan l2cap_ertm_send(sk); 34560a708f8fSGustavo F. Padovan 34570a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_WAIT_F) { 34580a708f8fSGustavo F. Padovan pi->srej_save_reqseq = tx_seq; 34590a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SREJ_ACT; 34600a708f8fSGustavo F. Padovan } 34610a708f8fSGustavo F. Padovan } else if (rx_control & L2CAP_CTRL_FINAL) { 34620a708f8fSGustavo F. Padovan if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && 34630a708f8fSGustavo F. Padovan pi->srej_save_reqseq == tx_seq) 34640a708f8fSGustavo F. Padovan pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; 34650a708f8fSGustavo F. Padovan else 34660a708f8fSGustavo F. Padovan l2cap_retransmit_one_frame(sk, tx_seq); 34670a708f8fSGustavo F. Padovan } else { 34680a708f8fSGustavo F. Padovan l2cap_retransmit_one_frame(sk, tx_seq); 34690a708f8fSGustavo F. Padovan if (pi->conn_state & L2CAP_CONN_WAIT_F) { 34700a708f8fSGustavo F. Padovan pi->srej_save_reqseq = tx_seq; 34710a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SREJ_ACT; 34720a708f8fSGustavo F. Padovan } 34730a708f8fSGustavo F. Padovan } 34740a708f8fSGustavo F. Padovan } 34750a708f8fSGustavo F. Padovan 34760a708f8fSGustavo F. Padovan static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) 34770a708f8fSGustavo F. Padovan { 34780a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 34790a708f8fSGustavo F. Padovan u8 tx_seq = __get_reqseq(rx_control); 34800a708f8fSGustavo F. Padovan 34810a708f8fSGustavo F. Padovan BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); 34820a708f8fSGustavo F. Padovan 34830a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; 34840a708f8fSGustavo F. Padovan pi->expected_ack_seq = tx_seq; 34850a708f8fSGustavo F. Padovan l2cap_drop_acked_frames(sk); 34860a708f8fSGustavo F. Padovan 34870a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 34880a708f8fSGustavo F. Padovan pi->conn_state |= L2CAP_CONN_SEND_FBIT; 34890a708f8fSGustavo F. Padovan 34900a708f8fSGustavo F. Padovan if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { 34910a708f8fSGustavo F. Padovan del_timer(&pi->retrans_timer); 34920a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 34930a708f8fSGustavo F. Padovan l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); 34940a708f8fSGustavo F. Padovan return; 34950a708f8fSGustavo F. Padovan } 34960a708f8fSGustavo F. Padovan 34970a708f8fSGustavo F. Padovan if (rx_control & L2CAP_CTRL_POLL) 34980a708f8fSGustavo F. Padovan l2cap_send_srejtail(sk); 34990a708f8fSGustavo F. Padovan else 35000a708f8fSGustavo F. Padovan l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); 35010a708f8fSGustavo F. Padovan } 35020a708f8fSGustavo F. Padovan 35030a708f8fSGustavo F. Padovan static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) 35040a708f8fSGustavo F. Padovan { 35050a708f8fSGustavo F. Padovan BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); 35060a708f8fSGustavo F. Padovan 35070a708f8fSGustavo F. Padovan if (L2CAP_CTRL_FINAL & rx_control && 35080a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { 35090a708f8fSGustavo F. Padovan del_timer(&l2cap_pi(sk)->monitor_timer); 35100a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->unacked_frames > 0) 35110a708f8fSGustavo F. Padovan __mod_retrans_timer(); 35120a708f8fSGustavo F. Padovan l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; 35130a708f8fSGustavo F. Padovan } 35140a708f8fSGustavo F. Padovan 35150a708f8fSGustavo F. Padovan switch (rx_control & L2CAP_CTRL_SUPERVISE) { 35160a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_READY: 35170a708f8fSGustavo F. Padovan l2cap_data_channel_rrframe(sk, rx_control); 35180a708f8fSGustavo F. Padovan break; 35190a708f8fSGustavo F. Padovan 35200a708f8fSGustavo F. Padovan case L2CAP_SUPER_REJECT: 35210a708f8fSGustavo F. Padovan l2cap_data_channel_rejframe(sk, rx_control); 35220a708f8fSGustavo F. Padovan break; 35230a708f8fSGustavo F. Padovan 35240a708f8fSGustavo F. Padovan case L2CAP_SUPER_SELECT_REJECT: 35250a708f8fSGustavo F. Padovan l2cap_data_channel_srejframe(sk, rx_control); 35260a708f8fSGustavo F. Padovan break; 35270a708f8fSGustavo F. Padovan 35280a708f8fSGustavo F. Padovan case L2CAP_SUPER_RCV_NOT_READY: 35290a708f8fSGustavo F. Padovan l2cap_data_channel_rnrframe(sk, rx_control); 35300a708f8fSGustavo F. Padovan break; 35310a708f8fSGustavo F. Padovan } 35320a708f8fSGustavo F. Padovan 35330a708f8fSGustavo F. Padovan kfree_skb(skb); 35340a708f8fSGustavo F. Padovan return 0; 35350a708f8fSGustavo F. Padovan } 35360a708f8fSGustavo F. Padovan 35370a708f8fSGustavo F. Padovan static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) 35380a708f8fSGustavo F. Padovan { 35390a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 35400a708f8fSGustavo F. Padovan u16 control; 35410a708f8fSGustavo F. Padovan u8 req_seq; 35420a708f8fSGustavo F. Padovan int len, next_tx_seq_offset, req_seq_offset; 35430a708f8fSGustavo F. Padovan 35440a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 35450a708f8fSGustavo F. Padovan skb_pull(skb, 2); 35460a708f8fSGustavo F. Padovan len = skb->len; 35470a708f8fSGustavo F. Padovan 35480a708f8fSGustavo F. Padovan /* 35490a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 35500a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 35510a708f8fSGustavo F. Padovan * procedures and ask retransmission. 35520a708f8fSGustavo F. Padovan */ 35530a708f8fSGustavo F. Padovan if (l2cap_check_fcs(pi, skb)) 35540a708f8fSGustavo F. Padovan goto drop; 35550a708f8fSGustavo F. Padovan 35560a708f8fSGustavo F. Padovan if (__is_sar_start(control) && __is_iframe(control)) 35570a708f8fSGustavo F. Padovan len -= 2; 35580a708f8fSGustavo F. Padovan 35590a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) 35600a708f8fSGustavo F. Padovan len -= 2; 35610a708f8fSGustavo F. Padovan 35620a708f8fSGustavo F. Padovan if (len > pi->mps) { 35630a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35640a708f8fSGustavo F. Padovan goto drop; 35650a708f8fSGustavo F. Padovan } 35660a708f8fSGustavo F. Padovan 35670a708f8fSGustavo F. Padovan req_seq = __get_reqseq(control); 35680a708f8fSGustavo F. Padovan req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; 35690a708f8fSGustavo F. Padovan if (req_seq_offset < 0) 35700a708f8fSGustavo F. Padovan req_seq_offset += 64; 35710a708f8fSGustavo F. Padovan 35720a708f8fSGustavo F. Padovan next_tx_seq_offset = 35730a708f8fSGustavo F. Padovan (pi->next_tx_seq - pi->expected_ack_seq) % 64; 35740a708f8fSGustavo F. Padovan if (next_tx_seq_offset < 0) 35750a708f8fSGustavo F. Padovan next_tx_seq_offset += 64; 35760a708f8fSGustavo F. Padovan 35770a708f8fSGustavo F. Padovan /* check for invalid req-seq */ 35780a708f8fSGustavo F. Padovan if (req_seq_offset > next_tx_seq_offset) { 35790a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35800a708f8fSGustavo F. Padovan goto drop; 35810a708f8fSGustavo F. Padovan } 35820a708f8fSGustavo F. Padovan 35830a708f8fSGustavo F. Padovan if (__is_iframe(control)) { 35840a708f8fSGustavo F. Padovan if (len < 0) { 35850a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35860a708f8fSGustavo F. Padovan goto drop; 35870a708f8fSGustavo F. Padovan } 35880a708f8fSGustavo F. Padovan 35890a708f8fSGustavo F. Padovan l2cap_data_channel_iframe(sk, control, skb); 35900a708f8fSGustavo F. Padovan } else { 35910a708f8fSGustavo F. Padovan if (len != 0) { 35920a708f8fSGustavo F. Padovan BT_ERR("%d", len); 35930a708f8fSGustavo F. Padovan l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); 35940a708f8fSGustavo F. Padovan goto drop; 35950a708f8fSGustavo F. Padovan } 35960a708f8fSGustavo F. Padovan 35970a708f8fSGustavo F. Padovan l2cap_data_channel_sframe(sk, control, skb); 35980a708f8fSGustavo F. Padovan } 35990a708f8fSGustavo F. Padovan 36000a708f8fSGustavo F. Padovan return 0; 36010a708f8fSGustavo F. Padovan 36020a708f8fSGustavo F. Padovan drop: 36030a708f8fSGustavo F. Padovan kfree_skb(skb); 36040a708f8fSGustavo F. Padovan return 0; 36050a708f8fSGustavo F. Padovan } 36060a708f8fSGustavo F. Padovan 36070a708f8fSGustavo F. Padovan static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) 36080a708f8fSGustavo F. Padovan { 360948454079SGustavo F. Padovan struct l2cap_chan *chan; 36100a708f8fSGustavo F. Padovan struct sock *sk; 36110a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi; 36120a708f8fSGustavo F. Padovan u16 control; 36130a708f8fSGustavo F. Padovan u8 tx_seq; 36140a708f8fSGustavo F. Padovan int len; 36150a708f8fSGustavo F. Padovan 3616baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 361748454079SGustavo F. Padovan if (!chan) { 36180a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 36190a708f8fSGustavo F. Padovan goto drop; 36200a708f8fSGustavo F. Padovan } 36210a708f8fSGustavo F. Padovan 362248454079SGustavo F. Padovan sk = chan->sk; 36230a708f8fSGustavo F. Padovan pi = l2cap_pi(sk); 36240a708f8fSGustavo F. Padovan 36250a708f8fSGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 36260a708f8fSGustavo F. Padovan 36270a708f8fSGustavo F. Padovan if (sk->sk_state != BT_CONNECTED) 36280a708f8fSGustavo F. Padovan goto drop; 36290a708f8fSGustavo F. Padovan 36300a708f8fSGustavo F. Padovan switch (pi->mode) { 36310a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 36320a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 36330a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 36340a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 36350a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 36360a708f8fSGustavo F. Padovan 36370a708f8fSGustavo F. Padovan if (pi->imtu < skb->len) 36380a708f8fSGustavo F. Padovan goto drop; 36390a708f8fSGustavo F. Padovan 36400a708f8fSGustavo F. Padovan if (!sock_queue_rcv_skb(sk, skb)) 36410a708f8fSGustavo F. Padovan goto done; 36420a708f8fSGustavo F. Padovan break; 36430a708f8fSGustavo F. Padovan 36440a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 36450a708f8fSGustavo F. Padovan if (!sock_owned_by_user(sk)) { 36460a708f8fSGustavo F. Padovan l2cap_ertm_data_rcv(sk, skb); 36470a708f8fSGustavo F. Padovan } else { 36480a708f8fSGustavo F. Padovan if (sk_add_backlog(sk, skb)) 36490a708f8fSGustavo F. Padovan goto drop; 36500a708f8fSGustavo F. Padovan } 36510a708f8fSGustavo F. Padovan 36520a708f8fSGustavo F. Padovan goto done; 36530a708f8fSGustavo F. Padovan 36540a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 36550a708f8fSGustavo F. Padovan control = get_unaligned_le16(skb->data); 36560a708f8fSGustavo F. Padovan skb_pull(skb, 2); 36570a708f8fSGustavo F. Padovan len = skb->len; 36580a708f8fSGustavo F. Padovan 36590a708f8fSGustavo F. Padovan if (l2cap_check_fcs(pi, skb)) 36600a708f8fSGustavo F. Padovan goto drop; 36610a708f8fSGustavo F. Padovan 36620a708f8fSGustavo F. Padovan if (__is_sar_start(control)) 36630a708f8fSGustavo F. Padovan len -= 2; 36640a708f8fSGustavo F. Padovan 36650a708f8fSGustavo F. Padovan if (pi->fcs == L2CAP_FCS_CRC16) 36660a708f8fSGustavo F. Padovan len -= 2; 36670a708f8fSGustavo F. Padovan 36680a708f8fSGustavo F. Padovan if (len > pi->mps || len < 0 || __is_sframe(control)) 36690a708f8fSGustavo F. Padovan goto drop; 36700a708f8fSGustavo F. Padovan 36710a708f8fSGustavo F. Padovan tx_seq = __get_txseq(control); 36720a708f8fSGustavo F. Padovan 36730a708f8fSGustavo F. Padovan if (pi->expected_tx_seq == tx_seq) 36740a708f8fSGustavo F. Padovan pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; 36750a708f8fSGustavo F. Padovan else 36760a708f8fSGustavo F. Padovan pi->expected_tx_seq = (tx_seq + 1) % 64; 36770a708f8fSGustavo F. Padovan 36780a708f8fSGustavo F. Padovan l2cap_streaming_reassembly_sdu(sk, skb, control); 36790a708f8fSGustavo F. Padovan 36800a708f8fSGustavo F. Padovan goto done; 36810a708f8fSGustavo F. Padovan 36820a708f8fSGustavo F. Padovan default: 36830a708f8fSGustavo F. Padovan BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); 36840a708f8fSGustavo F. Padovan break; 36850a708f8fSGustavo F. Padovan } 36860a708f8fSGustavo F. Padovan 36870a708f8fSGustavo F. Padovan drop: 36880a708f8fSGustavo F. Padovan kfree_skb(skb); 36890a708f8fSGustavo F. Padovan 36900a708f8fSGustavo F. Padovan done: 36910a708f8fSGustavo F. Padovan if (sk) 36920a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 36930a708f8fSGustavo F. Padovan 36940a708f8fSGustavo F. Padovan return 0; 36950a708f8fSGustavo F. Padovan } 36960a708f8fSGustavo F. Padovan 36970a708f8fSGustavo F. Padovan static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) 36980a708f8fSGustavo F. Padovan { 36990a708f8fSGustavo F. Padovan struct sock *sk; 37000a708f8fSGustavo F. Padovan 37010a708f8fSGustavo F. Padovan sk = l2cap_get_sock_by_psm(0, psm, conn->src); 37020a708f8fSGustavo F. Padovan if (!sk) 37030a708f8fSGustavo F. Padovan goto drop; 37040a708f8fSGustavo F. Padovan 37050a708f8fSGustavo F. Padovan bh_lock_sock(sk); 37060a708f8fSGustavo F. Padovan 37070a708f8fSGustavo F. Padovan BT_DBG("sk %p, len %d", sk, skb->len); 37080a708f8fSGustavo F. Padovan 37090a708f8fSGustavo F. Padovan if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) 37100a708f8fSGustavo F. Padovan goto drop; 37110a708f8fSGustavo F. Padovan 37120a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->imtu < skb->len) 37130a708f8fSGustavo F. Padovan goto drop; 37140a708f8fSGustavo F. Padovan 37150a708f8fSGustavo F. Padovan if (!sock_queue_rcv_skb(sk, skb)) 37160a708f8fSGustavo F. Padovan goto done; 37170a708f8fSGustavo F. Padovan 37180a708f8fSGustavo F. Padovan drop: 37190a708f8fSGustavo F. Padovan kfree_skb(skb); 37200a708f8fSGustavo F. Padovan 37210a708f8fSGustavo F. Padovan done: 37220a708f8fSGustavo F. Padovan if (sk) 37230a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 37240a708f8fSGustavo F. Padovan return 0; 37250a708f8fSGustavo F. Padovan } 37260a708f8fSGustavo F. Padovan 37270a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 37280a708f8fSGustavo F. Padovan { 37290a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 37300a708f8fSGustavo F. Padovan u16 cid, len; 37310a708f8fSGustavo F. Padovan __le16 psm; 37320a708f8fSGustavo F. Padovan 37330a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 37340a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 37350a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 37360a708f8fSGustavo F. Padovan 37370a708f8fSGustavo F. Padovan if (len != skb->len) { 37380a708f8fSGustavo F. Padovan kfree_skb(skb); 37390a708f8fSGustavo F. Padovan return; 37400a708f8fSGustavo F. Padovan } 37410a708f8fSGustavo F. Padovan 37420a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 37430a708f8fSGustavo F. Padovan 37440a708f8fSGustavo F. Padovan switch (cid) { 37453300d9a9SClaudio Takahasi case L2CAP_CID_LE_SIGNALING: 37460a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 37470a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 37480a708f8fSGustavo F. Padovan break; 37490a708f8fSGustavo F. Padovan 37500a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 37510a708f8fSGustavo F. Padovan psm = get_unaligned_le16(skb->data); 37520a708f8fSGustavo F. Padovan skb_pull(skb, 2); 37530a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 37540a708f8fSGustavo F. Padovan break; 37550a708f8fSGustavo F. Padovan 37560a708f8fSGustavo F. Padovan default: 37570a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 37580a708f8fSGustavo F. Padovan break; 37590a708f8fSGustavo F. Padovan } 37600a708f8fSGustavo F. Padovan } 37610a708f8fSGustavo F. Padovan 37620a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 37630a708f8fSGustavo F. Padovan 37640a708f8fSGustavo F. Padovan static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) 37650a708f8fSGustavo F. Padovan { 37660a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 37670a708f8fSGustavo F. Padovan register struct sock *sk; 37680a708f8fSGustavo F. Padovan struct hlist_node *node; 37690a708f8fSGustavo F. Padovan 37700a708f8fSGustavo F. Padovan if (type != ACL_LINK) 37710a708f8fSGustavo F. Padovan return -EINVAL; 37720a708f8fSGustavo F. Padovan 37730a708f8fSGustavo F. Padovan BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); 37740a708f8fSGustavo F. Padovan 37750a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 37760a708f8fSGustavo F. Padovan read_lock(&l2cap_sk_list.lock); 37770a708f8fSGustavo F. Padovan sk_for_each(sk, node, &l2cap_sk_list.head) { 37780a708f8fSGustavo F. Padovan if (sk->sk_state != BT_LISTEN) 37790a708f8fSGustavo F. Padovan continue; 37800a708f8fSGustavo F. Padovan 37810a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { 37820a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 37830a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->role_switch) 37840a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 37850a708f8fSGustavo F. Padovan exact++; 37860a708f8fSGustavo F. Padovan } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { 37870a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 37880a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->role_switch) 37890a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 37900a708f8fSGustavo F. Padovan } 37910a708f8fSGustavo F. Padovan } 37920a708f8fSGustavo F. Padovan read_unlock(&l2cap_sk_list.lock); 37930a708f8fSGustavo F. Padovan 37940a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 37950a708f8fSGustavo F. Padovan } 37960a708f8fSGustavo F. Padovan 37970a708f8fSGustavo F. Padovan static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 37980a708f8fSGustavo F. Padovan { 37990a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 38000a708f8fSGustavo F. Padovan 38010a708f8fSGustavo F. Padovan BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); 38020a708f8fSGustavo F. Padovan 3803acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 38040a708f8fSGustavo F. Padovan return -EINVAL; 38050a708f8fSGustavo F. Padovan 38060a708f8fSGustavo F. Padovan if (!status) { 38070a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, status); 38080a708f8fSGustavo F. Padovan if (conn) 38090a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 38100a708f8fSGustavo F. Padovan } else 38110a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(status)); 38120a708f8fSGustavo F. Padovan 38130a708f8fSGustavo F. Padovan return 0; 38140a708f8fSGustavo F. Padovan } 38150a708f8fSGustavo F. Padovan 38160a708f8fSGustavo F. Padovan static int l2cap_disconn_ind(struct hci_conn *hcon) 38170a708f8fSGustavo F. Padovan { 38180a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 38190a708f8fSGustavo F. Padovan 38200a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 38210a708f8fSGustavo F. Padovan 38220a708f8fSGustavo F. Padovan if (hcon->type != ACL_LINK || !conn) 38230a708f8fSGustavo F. Padovan return 0x13; 38240a708f8fSGustavo F. Padovan 38250a708f8fSGustavo F. Padovan return conn->disc_reason; 38260a708f8fSGustavo F. Padovan } 38270a708f8fSGustavo F. Padovan 38280a708f8fSGustavo F. Padovan static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 38290a708f8fSGustavo F. Padovan { 38300a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 38310a708f8fSGustavo F. Padovan 3832acd7d370SVille Tervo if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) 38330a708f8fSGustavo F. Padovan return -EINVAL; 38340a708f8fSGustavo F. Padovan 38350a708f8fSGustavo F. Padovan l2cap_conn_del(hcon, bt_err(reason)); 38360a708f8fSGustavo F. Padovan 38370a708f8fSGustavo F. Padovan return 0; 38380a708f8fSGustavo F. Padovan } 38390a708f8fSGustavo F. Padovan 38400a708f8fSGustavo F. Padovan static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) 38410a708f8fSGustavo F. Padovan { 38420a708f8fSGustavo F. Padovan if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) 38430a708f8fSGustavo F. Padovan return; 38440a708f8fSGustavo F. Padovan 38450a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 38460a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { 38470a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 38480a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ * 5); 38490a708f8fSGustavo F. Padovan } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) 38500a708f8fSGustavo F. Padovan __l2cap_sock_close(sk, ECONNREFUSED); 38510a708f8fSGustavo F. Padovan } else { 38520a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) 38530a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 38540a708f8fSGustavo F. Padovan } 38550a708f8fSGustavo F. Padovan } 38560a708f8fSGustavo F. Padovan 38570a708f8fSGustavo F. Padovan static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 38580a708f8fSGustavo F. Padovan { 38590a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 386048454079SGustavo F. Padovan struct l2cap_chan *chan; 38610a708f8fSGustavo F. Padovan 38620a708f8fSGustavo F. Padovan if (!conn) 38630a708f8fSGustavo F. Padovan return 0; 38640a708f8fSGustavo F. Padovan 38650a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 38660a708f8fSGustavo F. Padovan 3867baa7e1faSGustavo F. Padovan read_lock(&conn->chan_lock); 38680a708f8fSGustavo F. Padovan 3869baa7e1faSGustavo F. Padovan list_for_each_entry(chan, &conn->chan_l, list) { 387048454079SGustavo F. Padovan struct sock *sk = chan->sk; 3871baa7e1faSGustavo F. Padovan 38720a708f8fSGustavo F. Padovan bh_lock_sock(sk); 38730a708f8fSGustavo F. Padovan 38740a708f8fSGustavo F. Padovan if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { 38750a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 38760a708f8fSGustavo F. Padovan continue; 38770a708f8fSGustavo F. Padovan } 38780a708f8fSGustavo F. Padovan 38790a708f8fSGustavo F. Padovan if (!status && (sk->sk_state == BT_CONNECTED || 38800a708f8fSGustavo F. Padovan sk->sk_state == BT_CONFIG)) { 38810a708f8fSGustavo F. Padovan l2cap_check_encryption(sk, encrypt); 38820a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 38830a708f8fSGustavo F. Padovan continue; 38840a708f8fSGustavo F. Padovan } 38850a708f8fSGustavo F. Padovan 38860a708f8fSGustavo F. Padovan if (sk->sk_state == BT_CONNECT) { 38870a708f8fSGustavo F. Padovan if (!status) { 38880a708f8fSGustavo F. Padovan struct l2cap_conn_req req; 38890a708f8fSGustavo F. Padovan req.scid = cpu_to_le16(l2cap_pi(sk)->scid); 38900a708f8fSGustavo F. Padovan req.psm = l2cap_pi(sk)->psm; 38910a708f8fSGustavo F. Padovan 3892fc7f8a7eSGustavo F. Padovan chan->ident = l2cap_get_ident(conn); 38930a708f8fSGustavo F. Padovan l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; 38940a708f8fSGustavo F. Padovan 3895fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 38960a708f8fSGustavo F. Padovan L2CAP_CONN_REQ, sizeof(req), &req); 38970a708f8fSGustavo F. Padovan } else { 38980a708f8fSGustavo F. Padovan l2cap_sock_clear_timer(sk); 38990a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 10); 39000a708f8fSGustavo F. Padovan } 39010a708f8fSGustavo F. Padovan } else if (sk->sk_state == BT_CONNECT2) { 39020a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 39030a708f8fSGustavo F. Padovan __u16 result; 39040a708f8fSGustavo F. Padovan 39050a708f8fSGustavo F. Padovan if (!status) { 39060a708f8fSGustavo F. Padovan sk->sk_state = BT_CONFIG; 39070a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 39080a708f8fSGustavo F. Padovan } else { 39090a708f8fSGustavo F. Padovan sk->sk_state = BT_DISCONN; 39100a708f8fSGustavo F. Padovan l2cap_sock_set_timer(sk, HZ / 10); 39110a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 39120a708f8fSGustavo F. Padovan } 39130a708f8fSGustavo F. Padovan 39140a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); 39150a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); 39160a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 39170a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 3918fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 3919fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 39200a708f8fSGustavo F. Padovan } 39210a708f8fSGustavo F. Padovan 39220a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 39230a708f8fSGustavo F. Padovan } 39240a708f8fSGustavo F. Padovan 3925baa7e1faSGustavo F. Padovan read_unlock(&conn->chan_lock); 39260a708f8fSGustavo F. Padovan 39270a708f8fSGustavo F. Padovan return 0; 39280a708f8fSGustavo F. Padovan } 39290a708f8fSGustavo F. Padovan 39300a708f8fSGustavo F. Padovan static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 39310a708f8fSGustavo F. Padovan { 39320a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 39330a708f8fSGustavo F. Padovan 39340a708f8fSGustavo F. Padovan if (!conn) 39350a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 39360a708f8fSGustavo F. Padovan 39370a708f8fSGustavo F. Padovan if (!conn) 39380a708f8fSGustavo F. Padovan goto drop; 39390a708f8fSGustavo F. Padovan 39400a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 39410a708f8fSGustavo F. Padovan 39420a708f8fSGustavo F. Padovan if (!(flags & ACL_CONT)) { 39430a708f8fSGustavo F. Padovan struct l2cap_hdr *hdr; 394448454079SGustavo F. Padovan struct l2cap_chan *chan; 39450a708f8fSGustavo F. Padovan u16 cid; 39460a708f8fSGustavo F. Padovan int len; 39470a708f8fSGustavo F. Padovan 39480a708f8fSGustavo F. Padovan if (conn->rx_len) { 39490a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 39500a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 39510a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 39520a708f8fSGustavo F. Padovan conn->rx_len = 0; 39530a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39540a708f8fSGustavo F. Padovan } 39550a708f8fSGustavo F. Padovan 39560a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 39570a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 39580a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 39590a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39600a708f8fSGustavo F. Padovan goto drop; 39610a708f8fSGustavo F. Padovan } 39620a708f8fSGustavo F. Padovan 39630a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 39640a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 39650a708f8fSGustavo F. Padovan cid = __le16_to_cpu(hdr->cid); 39660a708f8fSGustavo F. Padovan 39670a708f8fSGustavo F. Padovan if (len == skb->len) { 39680a708f8fSGustavo F. Padovan /* Complete frame received */ 39690a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 39700a708f8fSGustavo F. Padovan return 0; 39710a708f8fSGustavo F. Padovan } 39720a708f8fSGustavo F. Padovan 39730a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 39740a708f8fSGustavo F. Padovan 39750a708f8fSGustavo F. Padovan if (skb->len > len) { 39760a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 39770a708f8fSGustavo F. Padovan skb->len, len); 39780a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39790a708f8fSGustavo F. Padovan goto drop; 39800a708f8fSGustavo F. Padovan } 39810a708f8fSGustavo F. Padovan 3982baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 39830a708f8fSGustavo F. Padovan 398448454079SGustavo F. Padovan if (chan && chan->sk) { 398548454079SGustavo F. Padovan struct sock *sk = chan->sk; 398648454079SGustavo F. Padovan 398748454079SGustavo F. Padovan if (l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { 398848454079SGustavo F. Padovan BT_ERR("Frame exceeding recv MTU (len %d, " 398948454079SGustavo F. Padovan "MTU %d)", len, 399048454079SGustavo F. Padovan l2cap_pi(sk)->imtu); 39910a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 39920a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 39930a708f8fSGustavo F. Padovan goto drop; 39940a708f8fSGustavo F. Padovan } 39950a708f8fSGustavo F. Padovan bh_unlock_sock(sk); 399648454079SGustavo F. Padovan } 39970a708f8fSGustavo F. Padovan 39980a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 39990a708f8fSGustavo F. Padovan conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); 40000a708f8fSGustavo F. Padovan if (!conn->rx_skb) 40010a708f8fSGustavo F. Padovan goto drop; 40020a708f8fSGustavo F. Padovan 40030a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 40040a708f8fSGustavo F. Padovan skb->len); 40050a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 40060a708f8fSGustavo F. Padovan } else { 40070a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 40080a708f8fSGustavo F. Padovan 40090a708f8fSGustavo F. Padovan if (!conn->rx_len) { 40100a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 40110a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 40120a708f8fSGustavo F. Padovan goto drop; 40130a708f8fSGustavo F. Padovan } 40140a708f8fSGustavo F. Padovan 40150a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 40160a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 40170a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 40180a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 40190a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 40200a708f8fSGustavo F. Padovan conn->rx_len = 0; 40210a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 40220a708f8fSGustavo F. Padovan goto drop; 40230a708f8fSGustavo F. Padovan } 40240a708f8fSGustavo F. Padovan 40250a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 40260a708f8fSGustavo F. Padovan skb->len); 40270a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 40280a708f8fSGustavo F. Padovan 40290a708f8fSGustavo F. Padovan if (!conn->rx_len) { 40300a708f8fSGustavo F. Padovan /* Complete frame received */ 40310a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, conn->rx_skb); 40320a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 40330a708f8fSGustavo F. Padovan } 40340a708f8fSGustavo F. Padovan } 40350a708f8fSGustavo F. Padovan 40360a708f8fSGustavo F. Padovan drop: 40370a708f8fSGustavo F. Padovan kfree_skb(skb); 40380a708f8fSGustavo F. Padovan return 0; 40390a708f8fSGustavo F. Padovan } 40400a708f8fSGustavo F. Padovan 40410a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 40420a708f8fSGustavo F. Padovan { 40430a708f8fSGustavo F. Padovan struct sock *sk; 40440a708f8fSGustavo F. Padovan struct hlist_node *node; 40450a708f8fSGustavo F. Padovan 40460a708f8fSGustavo F. Padovan read_lock_bh(&l2cap_sk_list.lock); 40470a708f8fSGustavo F. Padovan 40480a708f8fSGustavo F. Padovan sk_for_each(sk, node, &l2cap_sk_list.head) { 40490a708f8fSGustavo F. Padovan struct l2cap_pinfo *pi = l2cap_pi(sk); 40500a708f8fSGustavo F. Padovan 4051903d343eSGustavo F. Padovan seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 40520a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->src), 40530a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->dst), 40540a708f8fSGustavo F. Padovan sk->sk_state, __le16_to_cpu(pi->psm), 40550a708f8fSGustavo F. Padovan pi->scid, pi->dcid, 4056903d343eSGustavo F. Padovan pi->imtu, pi->omtu, pi->sec_level, 4057903d343eSGustavo F. Padovan pi->mode); 40580a708f8fSGustavo F. Padovan } 40590a708f8fSGustavo F. Padovan 40600a708f8fSGustavo F. Padovan read_unlock_bh(&l2cap_sk_list.lock); 40610a708f8fSGustavo F. Padovan 40620a708f8fSGustavo F. Padovan return 0; 40630a708f8fSGustavo F. Padovan } 40640a708f8fSGustavo F. Padovan 40650a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 40660a708f8fSGustavo F. Padovan { 40670a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 40680a708f8fSGustavo F. Padovan } 40690a708f8fSGustavo F. Padovan 40700a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 40710a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 40720a708f8fSGustavo F. Padovan .read = seq_read, 40730a708f8fSGustavo F. Padovan .llseek = seq_lseek, 40740a708f8fSGustavo F. Padovan .release = single_release, 40750a708f8fSGustavo F. Padovan }; 40760a708f8fSGustavo F. Padovan 40770a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 40780a708f8fSGustavo F. Padovan 40790a708f8fSGustavo F. Padovan static struct hci_proto l2cap_hci_proto = { 40800a708f8fSGustavo F. Padovan .name = "L2CAP", 40810a708f8fSGustavo F. Padovan .id = HCI_PROTO_L2CAP, 40820a708f8fSGustavo F. Padovan .connect_ind = l2cap_connect_ind, 40830a708f8fSGustavo F. Padovan .connect_cfm = l2cap_connect_cfm, 40840a708f8fSGustavo F. Padovan .disconn_ind = l2cap_disconn_ind, 40850a708f8fSGustavo F. Padovan .disconn_cfm = l2cap_disconn_cfm, 40860a708f8fSGustavo F. Padovan .security_cfm = l2cap_security_cfm, 40870a708f8fSGustavo F. Padovan .recv_acldata = l2cap_recv_acldata 40880a708f8fSGustavo F. Padovan }; 40890a708f8fSGustavo F. Padovan 409064274518SGustavo F. Padovan int __init l2cap_init(void) 40910a708f8fSGustavo F. Padovan { 40920a708f8fSGustavo F. Padovan int err; 40930a708f8fSGustavo F. Padovan 4094bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 40950a708f8fSGustavo F. Padovan if (err < 0) 40960a708f8fSGustavo F. Padovan return err; 40970a708f8fSGustavo F. Padovan 40980a708f8fSGustavo F. Padovan _busy_wq = create_singlethread_workqueue("l2cap"); 40990a708f8fSGustavo F. Padovan if (!_busy_wq) { 4100bb58f747SGustavo F. Padovan err = -ENOMEM; 41010a708f8fSGustavo F. Padovan goto error; 41020a708f8fSGustavo F. Padovan } 41030a708f8fSGustavo F. Padovan 41040a708f8fSGustavo F. Padovan err = hci_register_proto(&l2cap_hci_proto); 41050a708f8fSGustavo F. Padovan if (err < 0) { 41060a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol registration failed"); 41070a708f8fSGustavo F. Padovan bt_sock_unregister(BTPROTO_L2CAP); 41080a708f8fSGustavo F. Padovan goto error; 41090a708f8fSGustavo F. Padovan } 41100a708f8fSGustavo F. Padovan 41110a708f8fSGustavo F. Padovan if (bt_debugfs) { 41120a708f8fSGustavo F. Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, 41130a708f8fSGustavo F. Padovan bt_debugfs, NULL, &l2cap_debugfs_fops); 41140a708f8fSGustavo F. Padovan if (!l2cap_debugfs) 41150a708f8fSGustavo F. Padovan BT_ERR("Failed to create L2CAP debug file"); 41160a708f8fSGustavo F. Padovan } 41170a708f8fSGustavo F. Padovan 41180a708f8fSGustavo F. Padovan return 0; 41190a708f8fSGustavo F. Padovan 41200a708f8fSGustavo F. Padovan error: 41210a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 4122bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 41230a708f8fSGustavo F. Padovan return err; 41240a708f8fSGustavo F. Padovan } 41250a708f8fSGustavo F. Padovan 412664274518SGustavo F. Padovan void l2cap_exit(void) 41270a708f8fSGustavo F. Padovan { 41280a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 41290a708f8fSGustavo F. Padovan 41300a708f8fSGustavo F. Padovan flush_workqueue(_busy_wq); 41310a708f8fSGustavo F. Padovan destroy_workqueue(_busy_wq); 41320a708f8fSGustavo F. Padovan 41330a708f8fSGustavo F. Padovan if (hci_unregister_proto(&l2cap_hci_proto) < 0) 41340a708f8fSGustavo F. Padovan BT_ERR("L2CAP protocol unregistration failed"); 41350a708f8fSGustavo F. Padovan 4136bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 41370a708f8fSGustavo F. Padovan } 41380a708f8fSGustavo F. Padovan 41390a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 41400a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 4141