diff options
Diffstat (limited to 'net/bluetooth/l2cap_core.c')
| -rw-r--r-- | net/bluetooth/l2cap_core.c | 4240 |
1 files changed, 4240 insertions, 0 deletions
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c new file mode 100644 index 00000000000..a86f9ba4f05 --- /dev/null +++ b/net/bluetooth/l2cap_core.c @@ -0,0 +1,4240 @@ +/* + BlueZ - Bluetooth protocol stack for Linux + Copyright (C) 2000-2001 Qualcomm Incorporated + Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> + Copyright (C) 2010 Google Inc. + + Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as + published by the Free Software Foundation; + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. + IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY + CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + + ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, + COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS + SOFTWARE IS DISCLAIMED. +*/ + +/* Bluetooth L2CAP core. */ + +#include <linux/module.h> + +#include <linux/types.h> +#include <linux/capability.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/poll.h> +#include <linux/fcntl.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/socket.h> +#include <linux/skbuff.h> +#include <linux/list.h> +#include <linux/device.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> +#include <linux/crc16.h> +#include <net/sock.h> + +#include <asm/system.h> +#include <asm/unaligned.h> + +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> +#include <net/bluetooth/l2cap.h> + +int disable_ertm; + +static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; +static u8 l2cap_fixed_chan[8] = { 0x02, }; + +static struct workqueue_struct *_busy_wq; + +LIST_HEAD(chan_list); +DEFINE_RWLOCK(chan_list_lock); + +static void l2cap_busy_work(struct work_struct *work); + +static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, + u8 code, u8 ident, u16 dlen, void *data); +static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); + +static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); + +/* ---- L2CAP channels ---- */ +static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) +{ + struct l2cap_chan *c; + + list_for_each_entry(c, &conn->chan_l, list) { + if (c->dcid == cid) + return c; + } + return NULL; + +} + +static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) +{ + struct l2cap_chan *c; + + list_for_each_entry(c, &conn->chan_l, list) { + if (c->scid == cid) + return c; + } + return NULL; +} + +/* Find channel with given SCID. + * Returns locked socket */ +static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) +{ + struct l2cap_chan *c; + + read_lock(&conn->chan_lock); + c = __l2cap_get_chan_by_scid(conn, cid); + if (c) + bh_lock_sock(c->sk); + read_unlock(&conn->chan_lock); + return c; +} + +static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) +{ + struct l2cap_chan *c; + + list_for_each_entry(c, &conn->chan_l, list) { + if (c->ident == ident) + return c; + } + return NULL; +} + +static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) +{ + struct l2cap_chan *c; + + read_lock(&conn->chan_lock); + c = __l2cap_get_chan_by_ident(conn, ident); + if (c) + bh_lock_sock(c->sk); + read_unlock(&conn->chan_lock); + return c; +} + +static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) +{ + struct l2cap_chan *c; + + list_for_each_entry(c, &chan_list, global_l) { + if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) + goto found; + } + + c = NULL; +found: + return c; +} + +int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) +{ + int err; + + write_lock_bh(&chan_list_lock); + + if (psm && __l2cap_global_chan_by_addr(psm, src)) { + err = -EADDRINUSE; + goto done; + } + + if (psm) { + chan->psm = psm; + chan->sport = psm; + err = 0; + } else { + u16 p; + + err = -EINVAL; + for (p = 0x1001; p < 0x1100; p += 2) + if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { + chan->psm = cpu_to_le16(p); + chan->sport = cpu_to_le16(p); + err = 0; + break; + } + } + +done: + write_unlock_bh(&chan_list_lock); + return err; +} + +int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) +{ + write_lock_bh(&chan_list_lock); + + chan->scid = scid; + + write_unlock_bh(&chan_list_lock); + + return 0; +} + +static u16 l2cap_alloc_cid(struct l2cap_conn *conn) +{ + u16 cid = L2CAP_CID_DYN_START; + + for (; cid < L2CAP_CID_DYN_END; cid++) { + if (!__l2cap_get_chan_by_scid(conn, cid)) + return cid; + } + + return 0; +} + +struct l2cap_chan *l2cap_chan_create(struct sock *sk) +{ + struct l2cap_chan *chan; + + chan = kzalloc(sizeof(*chan), GFP_ATOMIC); + if (!chan) + return NULL; + + chan->sk = sk; + + write_lock_bh(&chan_list_lock); + list_add(&chan->global_l, &chan_list); + write_unlock_bh(&chan_list_lock); + + return chan; +} + +void l2cap_chan_destroy(struct l2cap_chan *chan) +{ + write_lock_bh(&chan_list_lock); + list_del(&chan->global_l); + write_unlock_bh(&chan_list_lock); + + kfree(chan); +} + +static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) +{ + struct sock *sk = chan->sk; + + BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, + chan->psm, chan->dcid); + + conn->disc_reason = 0x13; + + chan->conn = conn; + + if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { + if (conn->hcon->type == LE_LINK) { + /* LE connection */ + chan->omtu = L2CAP_LE_DEFAULT_MTU; + chan->scid = L2CAP_CID_LE_DATA; + chan->dcid = L2CAP_CID_LE_DATA; + } else { + /* Alloc CID for connection-oriented socket */ + chan->scid = l2cap_alloc_cid(conn); + chan->omtu = L2CAP_DEFAULT_MTU; + } + } else if (sk->sk_type == SOCK_DGRAM) { + /* Connectionless socket */ + chan->scid = L2CAP_CID_CONN_LESS; + chan->dcid = L2CAP_CID_CONN_LESS; + chan->omtu = L2CAP_DEFAULT_MTU; + } else { + /* Raw socket can send/recv signalling messages only */ + chan->scid = L2CAP_CID_SIGNALING; + chan->dcid = L2CAP_CID_SIGNALING; + chan->omtu = L2CAP_DEFAULT_MTU; + } + + sock_hold(sk); + + list_add(&chan->list, &conn->chan_l); +} + +/* Delete channel. + * Must be called on the locked socket. */ +void l2cap_chan_del(struct l2cap_chan *chan, int err) +{ + struct sock *sk = chan->sk; + struct l2cap_conn *conn = chan->conn; + struct sock *parent = bt_sk(sk)->parent; + + l2cap_sock_clear_timer(sk); + + BT_DBG("chan %p, conn %p, err %d", chan, conn, err); + + if (conn) { + /* Delete from channel list */ + write_lock_bh(&conn->chan_lock); + list_del(&chan->list); + write_unlock_bh(&conn->chan_lock); + __sock_put(sk); + + chan->conn = NULL; + hci_conn_put(conn->hcon); + } + + sk->sk_state = BT_CLOSED; + sock_set_flag(sk, SOCK_ZAPPED); + + if (err) + sk->sk_err = err; + + if (parent) { + bt_accept_unlink(sk); + parent->sk_data_ready(parent, 0); + } else + sk->sk_state_change(sk); + + if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE && + chan->conf_state & L2CAP_CONF_INPUT_DONE)) + return; + + skb_queue_purge(&chan->tx_q); + + if (chan->mode == L2CAP_MODE_ERTM) { + struct srej_list *l, *tmp; + + del_timer(&chan->retrans_timer); + del_timer(&chan->monitor_timer); + del_timer(&chan->ack_timer); + + skb_queue_purge(&chan->srej_q); + skb_queue_purge(&chan->busy_q); + + list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { + list_del(&l->list); + kfree(l); + } + } +} + +static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) +{ + struct sock *sk = chan->sk; + + if (sk->sk_type == SOCK_RAW) { + switch (chan->sec_level) { + case BT_SECURITY_HIGH: + return HCI_AT_DEDICATED_BONDING_MITM; + case BT_SECURITY_MEDIUM: + return HCI_AT_DEDICATED_BONDING; + default: + return HCI_AT_NO_BONDING; + } + } else if (chan->psm == cpu_to_le16(0x0001)) { + if (chan->sec_level == BT_SECURITY_LOW) + chan->sec_level = BT_SECURITY_SDP; + + if (chan->sec_level == BT_SECURITY_HIGH) + return HCI_AT_NO_BONDING_MITM; + else + return HCI_AT_NO_BONDING; + } else { + switch (chan->sec_level) { + case BT_SECURITY_HIGH: + return HCI_AT_GENERAL_BONDING_MITM; + case BT_SECURITY_MEDIUM: + return HCI_AT_GENERAL_BONDING; + default: + return HCI_AT_NO_BONDING; + } + } +} + +/* Service level security */ +static inline int l2cap_check_security(struct l2cap_chan *chan) +{ + struct l2cap_conn *conn = chan->conn; + __u8 auth_type; + + auth_type = l2cap_get_auth_type(chan); + + return hci_conn_security(conn->hcon, chan->sec_level, auth_type); +} + +u8 l2cap_get_ident(struct l2cap_conn *conn) +{ + u8 id; + + /* Get next available identificator. + * 1 - 128 are used by kernel. + * 129 - 199 are reserved. + * 200 - 254 are used by utilities like l2ping, etc. + */ + + spin_lock_bh(&conn->lock); + + if (++conn->tx_ident > 128) + conn->tx_ident = 1; + + id = conn->tx_ident; + + spin_unlock_bh(&conn->lock); + + return id; +} + +void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) +{ + struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); + u8 flags; + + BT_DBG("code 0x%2.2x", code); + + if (!skb) + return; + + if (lmp_no_flush_capable(conn->hcon->hdev)) + flags = ACL_START_NO_FLUSH; + else + flags = ACL_START; + + hci_send_acl(conn->hcon, skb, flags); +} + +static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) +{ + struct sk_buff *skb; + struct l2cap_hdr *lh; + struct l2cap_pinfo *pi = l2cap_pi(chan->sk); + struct l2cap_conn *conn = chan->conn; + struct sock *sk = (struct sock *)pi; + int count, hlen = L2CAP_HDR_SIZE + 2; + u8 flags; + + if (sk->sk_state != BT_CONNECTED) + return; + + if (chan->fcs == L2CAP_FCS_CRC16) + hlen += 2; + + BT_DBG("chan %p, control 0x%2.2x", chan, control); + + count = min_t(unsigned int, conn->mtu, hlen); + control |= L2CAP_CTRL_FRAME_TYPE; + + if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { + control |= L2CAP_CTRL_FINAL; + chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; + } + + if (chan->conn_state & L2CAP_CONN_SEND_PBIT) { + control |= L2CAP_CTRL_POLL; + chan->conn_state &= ~L2CAP_CONN_SEND_PBIT; + } + + skb = bt_skb_alloc(count, GFP_ATOMIC); + if (!skb) + return; + + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(chan->dcid); + put_unaligned_le16(control, skb_put(skb, 2)); + + if (chan->fcs == L2CAP_FCS_CRC16) { + u16 fcs = crc16(0, (u8 *)lh, count - 2); + put_unaligned_le16(fcs, skb_put(skb, 2)); + } + + if (lmp_no_flush_capable(conn->hcon->hdev)) + flags = ACL_START_NO_FLUSH; + else + flags = ACL_START; + + hci_send_acl(chan->conn->hcon, skb, flags); +} + +static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) +{ + if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { + control |= L2CAP_SUPER_RCV_NOT_READY; + chan->conn_state |= L2CAP_CONN_RNR_SENT; + } else + control |= L2CAP_SUPER_RCV_READY; + + control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + l2cap_send_sframe(chan, control); +} + +static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) +{ + return !(chan->conf_state & L2CAP_CONF_CONNECT_PEND); +} + +static void l2cap_do_start(struct l2cap_chan *chan) +{ + struct l2cap_conn *conn = chan->conn; + + if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { + if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) + return; + + if (l2cap_check_security(chan) && + __l2cap_no_conn_pending(chan)) { + struct l2cap_conn_req req; + req.scid = cpu_to_le16(chan->scid); + req.psm = chan->psm; + + chan->ident = l2cap_get_ident(conn); + chan->conf_state |= L2CAP_CONF_CONNECT_PEND; + + l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, + sizeof(req), &req); + } + } else { + struct l2cap_info_req req; + req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; + conn->info_ident = l2cap_get_ident(conn); + + mod_timer(&conn->info_timer, jiffies + + msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); + + l2cap_send_cmd(conn, conn->info_ident, + L2CAP_INFO_REQ, sizeof(req), &req); + } +} + +static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) +{ + u32 local_feat_mask = l2cap_feat_mask; + if (!disable_ertm) + local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; + + switch (mode) { + case L2CAP_MODE_ERTM: + return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; + case L2CAP_MODE_STREAMING: + return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; + default: + return 0x00; + } +} + +void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) +{ + struct sock *sk; + struct l2cap_disconn_req req; + + if (!conn) + return; + + sk = chan->sk; + + if (chan->mode == L2CAP_MODE_ERTM) { + del_timer(&chan->retrans_timer); + del_timer(&chan->monitor_timer); + del_timer(&chan->ack_timer); + } + + req.dcid = cpu_to_le16(chan->dcid); + req.scid = cpu_to_le16(chan->scid); + l2cap_send_cmd(conn, l2cap_get_ident(conn), + L2CAP_DISCONN_REQ, sizeof(req), &req); + + sk->sk_state = BT_DISCONN; + sk->sk_err = err; +} + +/* ---- L2CAP connections ---- */ +static void l2cap_conn_start(struct l2cap_conn *conn) +{ + struct l2cap_chan *chan, *tmp; + + BT_DBG("conn %p", conn); + + read_lock(&conn->chan_lock); + + list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { + struct sock *sk = chan->sk; + + bh_lock_sock(sk); + + if (sk->sk_type != SOCK_SEQPACKET && + sk->sk_type != SOCK_STREAM) { + bh_unlock_sock(sk); + continue; + } + + if (sk->sk_state == BT_CONNECT) { + struct l2cap_conn_req req; + + if (!l2cap_check_security(chan) || + !__l2cap_no_conn_pending(chan)) { + bh_unlock_sock(sk); + continue; + } + + if (!l2cap_mode_supported(chan->mode, + conn->feat_mask) + && chan->conf_state & + L2CAP_CONF_STATE2_DEVICE) { + /* __l2cap_sock_close() calls list_del(chan) + * so release the lock */ + read_unlock_bh(&conn->chan_lock); + __l2cap_sock_close(sk, ECONNRESET); + read_lock_bh(&conn->chan_lock); + bh_unlock_sock(sk); + continue; + } + + req.scid = cpu_to_le16(chan->scid); + req.psm = chan->psm; + + chan->ident = l2cap_get_ident(conn); + chan->conf_state |= L2CAP_CONF_CONNECT_PEND; + + l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, + sizeof(req), &req); + + } else if (sk->sk_state == BT_CONNECT2) { + struct l2cap_conn_rsp rsp; + char buf[128]; + rsp.scid = cpu_to_le16(chan->dcid); + rsp.dcid = cpu_to_le16(chan->scid); + + if (l2cap_check_security(chan)) { + if (bt_sk(sk)->defer_setup) { + struct sock *parent = bt_sk(sk)->parent; + rsp.result = cpu_to_le16(L2CAP_CR_PEND); + rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); + parent->sk_data_ready(parent, 0); + + } else { + sk->sk_state = BT_CONFIG; + rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + } + } else { + rsp.result = cpu_to_le16(L2CAP_CR_PEND); + rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); + } + + l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, + sizeof(rsp), &rsp); + + if (chan->conf_state & L2CAP_CONF_REQ_SENT || + rsp.result != L2CAP_CR_SUCCESS) { + bh_unlock_sock(sk); + continue; + } + + chan->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(chan, buf), buf); + chan->num_conf_req++; + } + + bh_unlock_sock(sk); + } + + read_unlock(&conn->chan_lock); +} + +/* Find socket with cid and source bdaddr. + * Returns closest match, locked. + */ +static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) +{ + struct l2cap_chan *c, *c1 = NULL; + + read_lock(&chan_list_lock); + + list_for_each_entry(c, &chan_list, global_l) { + struct sock *sk = c->sk; + + if (state && sk->sk_state != state) + continue; + + if (c->scid == cid) { + /* Exact match. */ + if (!bacmp(&bt_sk(sk)->src, src)) { + read_unlock(&chan_list_lock); + return c; + } + + /* Closest match */ + if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) + c1 = c; + } + } + + read_unlock(&chan_list_lock); + + return c1; +} + +static void l2cap_le_conn_ready(struct l2cap_conn *conn) +{ + struct sock *parent, *sk; + struct l2cap_chan *chan, *pchan; + + BT_DBG(""); + + /* Check if we have socket listening on cid */ + pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, + conn->src); + if (!pchan) + return; + + parent = pchan->sk; + + bh_lock_sock(parent); + + /* Check for backlog size */ + if (sk_acceptq_is_full(parent)) { + BT_DBG("backlog full %d", parent->sk_ack_backlog); + goto clean; + } + + sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); + if (!sk) + goto clean; + + chan = l2cap_chan_create(sk); + if (!chan) { + l2cap_sock_kill(sk); + goto clean; + } + + l2cap_pi(sk)->chan = chan; + + write_lock_bh(&conn->chan_lock); + + hci_conn_hold(conn->hcon); + + l2cap_sock_init(sk, parent); + + bacpy(&bt_sk(sk)->src, conn->src); + bacpy(&bt_sk(sk)->dst, conn->dst); + + bt_accept_enqueue(parent, sk); + + __l2cap_chan_add(conn, chan); + + l2cap_sock_set_timer(sk, sk->sk_sndtimeo); + + sk->sk_state = BT_CONNECTED; + parent->sk_data_ready(parent, 0); + + write_unlock_bh(&conn->chan_lock); + +clean: + bh_unlock_sock(parent); +} + +static void l2cap_conn_ready(struct l2cap_conn *conn) +{ + struct l2cap_chan *chan; + + BT_DBG("conn %p", conn); + + if (!conn->hcon->out && conn->hcon->type == LE_LINK) + l2cap_le_conn_ready(conn); + + read_lock(&conn->chan_lock); + + list_for_each_entry(chan, &conn->chan_l, list) { + struct sock *sk = chan->sk; + + bh_lock_sock(sk); + + if (conn->hcon->type == LE_LINK) { + l2cap_sock_clear_timer(sk); + sk->sk_state = BT_CONNECTED; + sk->sk_state_change(sk); + } + + if (sk->sk_type != SOCK_SEQPACKET && + sk->sk_type != SOCK_STREAM) { + l2cap_sock_clear_timer(sk); + sk->sk_state = BT_CONNECTED; + sk->sk_state_change(sk); + } else if (sk->sk_state == BT_CONNECT) + l2cap_do_start(chan); + + bh_unlock_sock(sk); + } + + read_unlock(&conn->chan_lock); +} + +/* Notify sockets that we cannot guaranty reliability anymore */ +static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) +{ + struct l2cap_chan *chan; + + BT_DBG("conn %p", conn); + + read_lock(&conn->chan_lock); + + list_for_each_entry(chan, &conn->chan_l, list) { + struct sock *sk = chan->sk; + + if (chan->force_reliable) + sk->sk_err = err; + } + + read_unlock(&conn->chan_lock); +} + +static void l2cap_info_timeout(unsigned long arg) +{ + struct l2cap_conn *conn = (void *) arg; + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); +} + +static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + if (conn || status) + return conn; + + conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); + if (!conn) + return NULL; + + hcon->l2cap_data = conn; + conn->hcon = hcon; + + BT_DBG("hcon %p conn %p", hcon, conn); + + if (hcon->hdev->le_mtu && hcon->type == LE_LINK) + conn->mtu = hcon->hdev->le_mtu; + else + conn->mtu = hcon->hdev->acl_mtu; + + conn->src = &hcon->hdev->bdaddr; + conn->dst = &hcon->dst; + + conn->feat_mask = 0; + + spin_lock_init(&conn->lock); + rwlock_init(&conn->chan_lock); + + INIT_LIST_HEAD(&conn->chan_l); + + if (hcon->type != LE_LINK) + setup_timer(&conn->info_timer, l2cap_info_timeout, + (unsigned long) conn); + + conn->disc_reason = 0x13; + + return conn; +} + +static void l2cap_conn_del(struct hci_conn *hcon, int err) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + struct l2cap_chan *chan, *l; + struct sock *sk; + + if (!conn) + return; + + BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); + + kfree_skb(conn->rx_skb); + + /* Kill channels */ + list_for_each_entry_safe(chan, l, &conn->chan_l, list) { + sk = chan->sk; + bh_lock_sock(sk); + l2cap_chan_del(chan, err); + bh_unlock_sock(sk); + l2cap_sock_kill(sk); + } + + if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) + del_timer_sync(&conn->info_timer); + + hcon->l2cap_data = NULL; + kfree(conn); +} + +static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) +{ + write_lock_bh(&conn->chan_lock); + __l2cap_chan_add(conn, chan); + write_unlock_bh(&conn->chan_lock); +} + +/* ---- Socket interface ---- */ + +/* Find socket with psm and source bdaddr. + * Returns closest match. + */ +static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) +{ + struct l2cap_chan *c, *c1 = NULL; + + read_lock(&chan_list_lock); + + list_for_each_entry(c, &chan_list, global_l) { + struct sock *sk = c->sk; + + if (state && sk->sk_state != state) + continue; + + if (c->psm == psm) { + /* Exact match. */ + if (!bacmp(&bt_sk(sk)->src, src)) { + read_unlock_bh(&chan_list_lock); + return c; + } + + /* Closest match */ + if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) + c1 = c; + } + } + + read_unlock(&chan_list_lock); + + return c1; +} + +int l2cap_chan_connect(struct l2cap_chan *chan) +{ + struct sock *sk = chan->sk; + bdaddr_t *src = &bt_sk(sk)->src; + bdaddr_t *dst = &bt_sk(sk)->dst; + struct l2cap_conn *conn; + struct hci_conn *hcon; + struct hci_dev *hdev; + __u8 auth_type; + int err; + + BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), + chan->psm); + + hdev = hci_get_route(dst, src); + if (!hdev) + return -EHOSTUNREACH; + + hci_dev_lock_bh(hdev); + + auth_type = l2cap_get_auth_type(chan); + + if (chan->dcid == L2CAP_CID_LE_DATA) + hcon = hci_connect(hdev, LE_LINK, dst, + chan->sec_level, auth_type); + else + hcon = hci_connect(hdev, ACL_LINK, dst, + chan->sec_level, auth_type); + + if (IS_ERR(hcon)) { + err = PTR_ERR(hcon); + goto done; + } + + conn = l2cap_conn_add(hcon, 0); + if (!conn) { + hci_conn_put(hcon); + err = -ENOMEM; + goto done; + } + + /* Update source addr of the socket */ + bacpy(src, conn->src); + + l2cap_chan_add(conn, chan); + + sk->sk_state = BT_CONNECT; + l2cap_sock_set_timer(sk, sk->sk_sndtimeo); + + if (hcon->state == BT_CONNECTED) { + if (sk->sk_type != SOCK_SEQPACKET && + sk->sk_type != SOCK_STREAM) { + l2cap_sock_clear_timer(sk); + if (l2cap_check_security(chan)) + sk->sk_state = BT_CONNECTED; + } else + l2cap_do_start(chan); + } + + err = 0; + +done: + hci_dev_unlock_bh(hdev); + hci_dev_put(hdev); + return err; +} + +int __l2cap_wait_ack(struct sock *sk) +{ + struct l2cap_chan *chan = l2cap_pi(sk)->chan; + DECLARE_WAITQUEUE(wait, current); + int err = 0; + int timeo = HZ/5; + + add_wait_queue(sk_sleep(sk), &wait); + while ((chan->unacked_frames > 0 && chan->conn)) { + set_current_state(TASK_INTERRUPTIBLE); + + if (!timeo) + timeo = HZ/5; + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock(sk); + + err = sock_error(sk); + if (err) + break; + } + set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + return err; +} + +static void l2cap_monitor_timeout(unsigned long arg) +{ + struct l2cap_chan *chan = (void *) arg; + struct sock *sk = chan->sk; + + BT_DBG("chan %p", chan); + + bh_lock_sock(sk); + if (chan->retry_count >= chan->remote_max_tx) { + l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); + bh_unlock_sock(sk); + return; + } + + chan->retry_count++; + __mod_monitor_timer(); + + l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); + bh_unlock_sock(sk); +} + +static void l2cap_retrans_timeout(unsigned long arg) +{ + struct l2cap_chan *chan = (void *) arg; + struct sock *sk = chan->sk; + + BT_DBG("chan %p", chan); + + bh_lock_sock(sk); + chan->retry_count = 1; + __mod_monitor_timer(); + + chan->conn_state |= L2CAP_CONN_WAIT_F; + + l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); + bh_unlock_sock(sk); +} + +static void l2cap_drop_acked_frames(struct l2cap_chan *chan) +{ + struct sk_buff *skb; + + while ((skb = skb_peek(&chan->tx_q)) && + chan->unacked_frames) { + if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) + break; + + skb = skb_dequeue(&chan->tx_q); + kfree_skb(skb); + + chan->unacked_frames--; + } + + if (!chan->unacked_frames) + del_timer(&chan->retrans_timer); +} + +void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) +{ + struct hci_conn *hcon = chan->conn->hcon; + u16 flags; + + BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len); + + if (!chan->flushable && lmp_no_flush_capable(hcon->hdev)) + flags = ACL_START_NO_FLUSH; + else + flags = ACL_START; + + hci_send_acl(hcon, skb, flags); +} + +void l2cap_streaming_send(struct l2cap_chan *chan) +{ + struct sk_buff *skb; + u16 control, fcs; + + while ((skb = skb_dequeue(&chan->tx_q))) { + control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); + control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; + put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); + + if (chan->fcs == L2CAP_FCS_CRC16) { + fcs = crc16(0, (u8 *)skb->data, skb->len - 2); + put_unaligned_le16(fcs, skb->data + skb->len - 2); + } + + l2cap_do_send(chan, skb); + + chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; + } +} + +static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) +{ + struct sk_buff *skb, *tx_skb; + u16 control, fcs; + + skb = skb_peek(&chan->tx_q); + if (!skb) + return; + + do { + if (bt_cb(skb)->tx_seq == tx_seq) + break; + + if (skb_queue_is_last(&chan->tx_q, skb)) + return; + + } while ((skb = skb_queue_next(&chan->tx_q, skb))); + + if (chan->remote_max_tx && + bt_cb(skb)->retries == chan->remote_max_tx) { + l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); + return; + } + + tx_skb = skb_clone(skb, GFP_ATOMIC); + bt_cb(skb)->retries++; + control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); + control &= L2CAP_CTRL_SAR; + + if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { + control |= L2CAP_CTRL_FINAL; + chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; + } + + control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) + | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); + + put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); + + if (chan->fcs == L2CAP_FCS_CRC16) { + fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); + put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); + } + + l2cap_do_send(chan, tx_skb); +} + +int l2cap_ertm_send(struct l2cap_chan *chan) +{ + struct sk_buff *skb, *tx_skb; + struct sock *sk = chan->sk; + u16 control, fcs; + int nsent = 0; + + if (sk->sk_state != BT_CONNECTED) + return -ENOTCONN; + + while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { + + if (chan->remote_max_tx && + bt_cb(skb)->retries == chan->remote_max_tx) { + l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); + break; + } + + tx_skb = skb_clone(skb, GFP_ATOMIC); + + bt_cb(skb)->retries++; + + control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); + control &= L2CAP_CTRL_SAR; + + if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { + control |= L2CAP_CTRL_FINAL; + chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; + } + control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) + | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); + put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); + + + if (chan->fcs == L2CAP_FCS_CRC16) { + fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); + put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); + } + + l2cap_do_send(chan, tx_skb); + + __mod_retrans_timer(); + + bt_cb(skb)->tx_seq = chan->next_tx_seq; + chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; + + if (bt_cb(skb)->retries == 1) + chan->unacked_frames++; + + chan->frames_sent++; + + if (skb_queue_is_last(&chan->tx_q, skb)) + chan->tx_send_head = NULL; + else + chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); + + nsent++; + } + + return nsent; +} + +static int l2cap_retransmit_frames(struct l2cap_chan *chan) +{ + int ret; + + if (!skb_queue_empty(&chan->tx_q)) + chan->tx_send_head = chan->tx_q.next; + + chan->next_tx_seq = chan->expected_ack_seq; + ret = l2cap_ertm_send(chan); + return ret; +} + +static void l2cap_send_ack(struct l2cap_chan *chan) +{ + u16 control = 0; + + control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { + control |= L2CAP_SUPER_RCV_NOT_READY; + chan->conn_state |= L2CAP_CONN_RNR_SENT; + l2cap_send_sframe(chan, control); + return; + } + + if (l2cap_ertm_send(chan) > 0) + return; + + control |= L2CAP_SUPER_RCV_READY; + l2cap_send_sframe(chan, control); +} + +static void l2cap_send_srejtail(struct l2cap_chan *chan) +{ + struct srej_list *tail; + u16 control; + + control = L2CAP_SUPER_SELECT_REJECT; + control |= L2CAP_CTRL_FINAL; + + tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); + control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + l2cap_send_sframe(chan, control); +} + +static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; + struct sk_buff **frag; + int err, sent = 0; + + if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) + return -EFAULT; + + sent += count; + len -= count; + + /* Continuation fragments (no L2CAP header) */ + frag = &skb_shinfo(skb)->frag_list; + while (len) { + count = min_t(unsigned int, conn->mtu, len); + + *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); + if (!*frag) + return err; + if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) + return -EFAULT; + + sent += count; + len -= count; + + frag = &(*frag)->next; + } + + return sent; +} + +struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) +{ + struct sock *sk = chan->sk; + struct l2cap_conn *conn = chan->conn; + struct sk_buff *skb; + int err, count, hlen = L2CAP_HDR_SIZE + 2; + struct l2cap_hdr *lh; + + BT_DBG("sk %p len %d", sk, (int)len); + + count = min_t(unsigned int, (conn->mtu - hlen), len); + skb = bt_skb_send_alloc(sk, count + hlen, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + return ERR_PTR(err); + + /* Create L2CAP header */ + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(chan->dcid); + lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); + put_unaligned_le16(chan->psm, skb_put(skb, 2)); + + err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); + if (unlikely(err < 0)) { + kfree_skb(skb); + return ERR_PTR(err); + } + return skb; +} + +struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) +{ + struct sock *sk = chan->sk; + struct l2cap_conn *conn = chan->conn; + struct sk_buff *skb; + int err, count, hlen = L2CAP_HDR_SIZE; + struct l2cap_hdr *lh; + + BT_DBG("sk %p len %d", sk, (int)len); + + count = min_t(unsigned int, (conn->mtu - hlen), len); + skb = bt_skb_send_alloc(sk, count + hlen, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + return ERR_PTR(err); + + /* Create L2CAP header */ + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(chan->dcid); + lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); + + err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); + if (unlikely(err < 0)) { + kfree_skb(skb); + return ERR_PTR(err); + } + return skb; +} + +struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen) +{ + struct sock *sk = chan->sk; + struct l2cap_conn *conn = chan->conn; + struct sk_buff *skb; + int err, count, hlen = L2CAP_HDR_SIZE + 2; + struct l2cap_hdr *lh; + + BT_DBG("sk %p len %d", sk, (int)len); + + if (!conn) + return ERR_PTR(-ENOTCONN); + + if (sdulen) + hlen += 2; + + if (chan->fcs == L2CAP_FCS_CRC16) + hlen += 2; + + count = min_t(unsigned int, (conn->mtu - hlen), len); + skb = bt_skb_send_alloc(sk, count + hlen, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + return ERR_PTR(err); + + /* Create L2CAP header */ + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(chan->dcid); + lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); + put_unaligned_le16(control, skb_put(skb, 2)); + if (sdulen) + put_unaligned_le16(sdulen, skb_put(skb, 2)); + + err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); + if (unlikely(err < 0)) { + kfree_skb(skb); + return ERR_PTR(err); + } + + if (chan->fcs == L2CAP_FCS_CRC16) + put_unaligned_le16(0, skb_put(skb, 2)); + + bt_cb(skb)->retries = 0; + return skb; +} + +int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) +{ + struct sk_buff *skb; + struct sk_buff_head sar_queue; + u16 control; + size_t size = 0; + + skb_queue_head_init(&sar_queue); + control = L2CAP_SDU_START; + skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); + if (IS_ERR(skb)) + return PTR_ERR(skb); + + __skb_queue_tail(&sar_queue, skb); + len -= chan->remote_mps; + size += chan->remote_mps; + + while (len > 0) { + size_t buflen; + + if (len > chan->remote_mps) { + control = L2CAP_SDU_CONTINUE; + buflen = chan->remote_mps; + } else { + control = L2CAP_SDU_END; + buflen = len; + } + + skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); + if (IS_ERR(skb)) { + skb_queue_purge(&sar_queue); + return PTR_ERR(skb); + } + + __skb_queue_tail(&sar_queue, skb); + len -= buflen; + size += buflen; + } + skb_queue_splice_tail(&sar_queue, &chan->tx_q); + if (chan->tx_send_head == NULL) + chan->tx_send_head = sar_queue.next; + + return size; +} + +static void l2cap_chan_ready(struct sock *sk) +{ + struct sock *parent = bt_sk(sk)->parent; + struct l2cap_chan *chan = l2cap_pi(sk)->chan; + + BT_DBG("sk %p, parent %p", sk, parent); + + chan->conf_state = 0; + l2cap_sock_clear_timer(sk); + + if (!parent) { + /* Outgoing channel. + * Wake up socket sleeping on connect. + */ + sk->sk_state = BT_CONNECTED; + sk->sk_state_change(sk); + } else { + /* Incoming channel. + * Wake up socket sleeping on accept. + */ + parent->sk_data_ready(parent, 0); + } +} + +/* Copy frame to all raw sockets on that connection */ +static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) +{ + struct sk_buff *nskb; + struct l2cap_chan *chan; + + BT_DBG("conn %p", conn); + + read_lock(&conn->chan_lock); + list_for_each_entry(chan, &conn->chan_l, list) { + struct sock *sk = chan->sk; + if (sk->sk_type != SOCK_RAW) + continue; + + /* Don't send frame to the socket it came from */ + if (skb->sk == sk) + continue; + nskb = skb_clone(skb, GFP_ATOMIC); + if (!nskb) + continue; + + if (sock_queue_rcv_skb(sk, nskb)) + kfree_skb(nskb); + } + read_unlock(&conn->chan_lock); +} + +/* ---- L2CAP signalling commands ---- */ +static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, + u8 code, u8 ident, u16 dlen, void *data) +{ + struct sk_buff *skb, **frag; + struct l2cap_cmd_hdr *cmd; + struct l2cap_hdr *lh; + int len, count; + + BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", + conn, code, ident, dlen); + + len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; + count = min_t(unsigned int, conn->mtu, len); + + skb = bt_skb_alloc(count, GFP_ATOMIC); + if (!skb) + return NULL; + + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); + + if (conn->hcon->type == LE_LINK) + lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); + else + lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); + + cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); + cmd->code = code; + cmd->ident = ident; + cmd->len = cpu_to_le16(dlen); + + if (dlen) { + count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; + memcpy(skb_put(skb, count), data, count); + data += count; + } + + len -= skb->len; + + /* Continuation fragments (no L2CAP header) */ + frag = &skb_shinfo(skb)->frag_list; + while (len) { + count = min_t(unsigned int, conn->mtu, len); + + *frag = bt_skb_alloc(count, GFP_ATOMIC); + if (!*frag) + goto fail; + + memcpy(skb_put(*frag, count), data, count); + + len -= count; + data += count; + + frag = &(*frag)->next; + } + + return skb; + +fail: + kfree_skb(skb); + return NULL; +} + +static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) +{ + struct l2cap_conf_opt *opt = *ptr; + int len; + + len = L2CAP_CONF_OPT_SIZE + opt->len; + *ptr += len; + + *type = opt->type; + *olen = opt->len; + + switch (opt->len) { + case 1: + *val = *((u8 *) opt->val); + break; + + case 2: + *val = get_unaligned_le16(opt->val); + break; + + case 4: + *val = get_unaligned_le32(opt->val); + break; + + default: + *val = (unsigned long) opt->val; + break; + } + + BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); + return len; +} + +static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) +{ + struct l2cap_conf_opt *opt = *ptr; + + BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); + + opt->type = type; + opt->len = len; + + switch (len) { + case 1: + *((u8 *) opt->val) = val; + break; + + case 2: + put_unaligned_le16(val, opt->val); + break; + + case 4: + put_unaligned_le32(val, opt->val); + break; + + default: + memcpy(opt->val, (void *) val, len); + break; + } + + *ptr += L2CAP_CONF_OPT_SIZE + len; +} + +static void l2cap_ack_timeout(unsigned long arg) +{ + struct l2cap_chan *chan = (void *) arg; + + bh_lock_sock(chan->sk); + l2cap_send_ack(chan); + bh_unlock_sock(chan->sk); +} + +static inline void l2cap_ertm_init(struct l2cap_chan *chan) +{ + struct sock *sk = chan->sk; + + chan->expected_ack_seq = 0; + chan->unacked_frames = 0; + chan->buffer_seq = 0; + chan->num_acked = 0; + chan->frames_sent = 0; + + setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, + (unsigned long) chan); + setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, + (unsigned long) chan); + setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); + + skb_queue_head_init(&chan->srej_q); + skb_queue_head_init(&chan->busy_q); + + INIT_LIST_HEAD(&chan->srej_l); + + INIT_WORK(&chan->busy_work, l2cap_busy_work); + + sk->sk_backlog_rcv = l2cap_ertm_data_rcv; +} + +static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) +{ + switch (mode) { + case L2CAP_MODE_STREAMING: + case L2CAP_MODE_ERTM: + if (l2cap_mode_supported(mode, remote_feat_mask)) + return mode; + /* fall through */ + default: + return L2CAP_MODE_BASIC; + } +} + +static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) +{ + struct l2cap_conf_req *req = data; + struct l2cap_conf_rfc rfc = { .mode = chan->mode }; + void *ptr = req->data; + + BT_DBG("chan %p", chan); + + if (chan->num_conf_req || chan->num_conf_rsp) + goto done; + + switch (chan->mode) { + case L2CAP_MODE_STREAMING: + case L2CAP_MODE_ERTM: + if (chan->conf_state & L2CAP_CONF_STATE2_DEVICE) + break; + + /* fall through */ + default: + chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); + break; + } + +done: + if (chan->imtu != L2CAP_DEFAULT_MTU) + l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); + + switch (chan->mode) { + case L2CAP_MODE_BASIC: + if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && + !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) + break; + + rfc.mode = L2CAP_MODE_BASIC; + rfc.txwin_size = 0; + rfc.max_transmit = 0; + rfc.retrans_timeout = 0; + rfc.monitor_timeout = 0; + rfc.max_pdu_size = 0; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), + (unsigned long) &rfc); + break; + + case L2CAP_MODE_ERTM: + rfc.mode = L2CAP_MODE_ERTM; + rfc.txwin_size = chan->tx_win; + rfc.max_transmit = chan->max_tx; + rfc.retrans_timeout = 0; + rfc.monitor_timeout = 0; + rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); + if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) + rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), + (unsigned long) &rfc); + + if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) + break; + + if (chan->fcs == L2CAP_FCS_NONE || + chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { + chan->fcs = L2CAP_FCS_NONE; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); + } + break; + + case L2CAP_MODE_STREAMING: + rfc.mode = L2CAP_MODE_STREAMING; + rfc.txwin_size = 0; + rfc.max_transmit = 0; + rfc.retrans_timeout = 0; + rfc.monitor_timeout = 0; + rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); + if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) + rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), + (unsigned long) &rfc); + + if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) + break; + + if (chan->fcs == L2CAP_FCS_NONE || + chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { + chan->fcs = L2CAP_FCS_NONE; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); + } + break; + } + + req->dcid = cpu_to_le16(chan->dcid); + req->flags = cpu_to_le16(0); + + return ptr - data; +} + +static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) +{ + struct l2cap_conf_rsp *rsp = data; + void *ptr = rsp->data; + void *req = chan->conf_req; + int len = chan->conf_len; + int type, hint, olen; + unsigned long val; + struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; + u16 mtu = L2CAP_DEFAULT_MTU; + u16 result = L2CAP_CONF_SUCCESS; + + BT_DBG("chan %p", chan); + + while (len >= L2CAP_CONF_OPT_SIZE) { + len -= l2cap_get_conf_opt(&req, &type, &olen, &val); + + hint = type & L2CAP_CONF_HINT; + type &= L2CAP_CONF_MASK; + + switch (type) { + case L2CAP_CONF_MTU: + mtu = val; + break; + + case L2CAP_CONF_FLUSH_TO: + chan->flush_to = val; + break; + + case L2CAP_CONF_QOS: + break; + + case L2CAP_CONF_RFC: + if (olen == sizeof(rfc)) + memcpy(&rfc, (void *) val, olen); + break; + + case L2CAP_CONF_FCS: + if (val == L2CAP_FCS_NONE) + chan->conf_state |= L2CAP_CONF_NO_FCS_RECV; + + break; + + default: + if (hint) + break; + + result = L2CAP_CONF_UNKNOWN; + *((u8 *) ptr++) = type; + break; + } + } + + if (chan->num_conf_rsp || chan->num_conf_req > 1) + goto done; + + switch (chan->mode) { + case L2CAP_MODE_STREAMING: + case L2CAP_MODE_ERTM: + if (!(chan->conf_state & L2CAP_CONF_STATE2_DEVICE)) { + chan->mode = l2cap_select_mode(rfc.mode, + chan->conn->feat_mask); + break; + } + + if (chan->mode != rfc.mode) + return -ECONNREFUSED; + + break; + } + +done: + if (chan->mode != rfc.mode) { + result = L2CAP_CONF_UNACCEPT; + rfc.mode = chan->mode; + + if (chan->num_conf_rsp == 1) + return -ECONNREFUSED; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + } + + + if (result == L2CAP_CONF_SUCCESS) { + /* Configure output options and let the other side know + * which ones we don't like. */ + + if (mtu < L2CAP_DEFAULT_MIN_MTU) + result = L2CAP_CONF_UNACCEPT; + else { + chan->omtu = mtu; + chan->conf_state |= L2CAP_CONF_MTU_DONE; + } + l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); + + switch (rfc.mode) { + case L2CAP_MODE_BASIC: + chan->fcs = L2CAP_FCS_NONE; + chan->conf_state |= L2CAP_CONF_MODE_DONE; + break; + + case L2CAP_MODE_ERTM: + chan->remote_tx_win = rfc.txwin_size; + chan->remote_max_tx = rfc.max_transmit; + + if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) + rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); + + chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); + + rfc.retrans_timeout = + le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); + rfc.monitor_timeout = + le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); + + chan->conf_state |= L2CAP_CONF_MODE_DONE; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + + break; + + case L2CAP_MODE_STREAMING: + if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) + rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); + + chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); + + chan->conf_state |= L2CAP_CONF_MODE_DONE; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + + break; + + default: + result = L2CAP_CONF_UNACCEPT; + + memset(&rfc, 0, sizeof(rfc)); + rfc.mode = chan->mode; + } + + if (result == L2CAP_CONF_SUCCESS) + chan->conf_state |= L2CAP_CONF_OUTPUT_DONE; + } + rsp->scid = cpu_to_le16(chan->dcid); + rsp->result = cpu_to_le16(result); + rsp->flags = cpu_to_le16(0x0000); + + return ptr - data; +} + +static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) +{ + struct l2cap_conf_req *req = data; + void *ptr = req->data; + int type, olen; + unsigned long val; + struct l2cap_conf_rfc rfc; + + BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); + + while (len >= L2CAP_CONF_OPT_SIZE) { + len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); + + switch (type) { + case L2CAP_CONF_MTU: + if (val < L2CAP_DEFAULT_MIN_MTU) { + *result = L2CAP_CONF_UNACCEPT; + chan->imtu = L2CAP_DEFAULT_MIN_MTU; + } else + chan->imtu = val; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); + break; + + case L2CAP_CONF_FLUSH_TO: + chan->flush_to = val; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, + 2, chan->flush_to); + break; + + case L2CAP_CONF_RFC: + if (olen == sizeof(rfc)) + memcpy(&rfc, (void *)val, olen); + + if ((chan->conf_state & L2CAP_CONF_STATE2_DEVICE) && + rfc.mode != chan->mode) + return -ECONNREFUSED; + + chan->fcs = 0; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + break; + } + } + + if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) + return -ECONNREFUSED; + + chan->mode = rfc.mode; + + if (*result == L2CAP_CONF_SUCCESS) { + switch (rfc.mode) { + case L2CAP_MODE_ERTM: + chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); + chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); + chan->mps = le16_to_cpu(rfc.max_pdu_size); + break; + case L2CAP_MODE_STREAMING: + chan->mps = le16_to_cpu(rfc.max_pdu_size); + } + } + + req->dcid = cpu_to_le16(chan->dcid); + req->flags = cpu_to_le16(0x0000); + + return ptr - data; +} + +static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) +{ + struct l2cap_conf_rsp *rsp = data; + void *ptr = rsp->data; + + BT_DBG("chan %p", chan); + + rsp->scid = cpu_to_le16(chan->dcid); + rsp->result = cpu_to_le16(result); + rsp->flags = cpu_to_le16(flags); + + return ptr - data; +} + +void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) +{ + struct l2cap_conn_rsp rsp; + struct l2cap_conn *conn = chan->conn; + u8 buf[128]; + + rsp.scid = cpu_to_le16(chan->dcid); + rsp.dcid = cpu_to_le16(chan->scid); + rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + l2cap_send_cmd(conn, chan->ident, + L2CAP_CONN_RSP, sizeof(rsp), &rsp); + + if (chan->conf_state & L2CAP_CONF_REQ_SENT) + return; + + chan->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(chan, buf), buf); + chan->num_conf_req++; +} + +static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) +{ + int type, olen; + unsigned long val; + struct l2cap_conf_rfc rfc; + + BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); + + if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) + return; + + while (len >= L2CAP_CONF_OPT_SIZE) { + len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); + + switch (type) { + case L2CAP_CONF_RFC: + if (olen == sizeof(rfc)) + memcpy(&rfc, (void *)val, olen); + goto done; + } + } + +done: + switch (rfc.mode) { + case L2CAP_MODE_ERTM: + chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); + chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); + chan->mps = le16_to_cpu(rfc.max_pdu_size); + break; + case L2CAP_MODE_STREAMING: + chan->mps = le16_to_cpu(rfc.max_pdu_size); + } +} + +static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; + + if (rej->reason != 0x0000) + return 0; + + if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && + cmd->ident == conn->info_ident) { + del_timer(&conn->info_timer); + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + } + + return 0; +} + +static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; + struct l2cap_conn_rsp rsp; + struct l2cap_chan *chan = NULL, *pchan; + struct sock *parent, *sk = NULL; + int result, status = L2CAP_CS_NO_INFO; + + u16 dcid = 0, scid = __le16_to_cpu(req->scid); + __le16 psm = req->psm; + + BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); + + /* Check if we have socket listening on psm */ + pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); + if (!pchan) { + result = L2CAP_CR_BAD_PSM; + goto sendresp; + } + + parent = pchan->sk; + + bh_lock_sock(parent); + + /* Check if the ACL is secure enough (if not SDP) */ + if (psm != cpu_to_le16(0x0001) && + !hci_conn_check_link_mode(conn->hcon)) { + conn->disc_reason = 0x05; + result = L2CAP_CR_SEC_BLOCK; + goto response; + } + + result = L2CAP_CR_NO_MEM; + + /* Check for backlog size */ + if (sk_acceptq_is_full(parent)) { + BT_DBG("backlog full %d", parent->sk_ack_backlog); + goto response; + } + + sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); + if (!sk) + goto response; + + chan = l2cap_chan_create(sk); + if (!chan) { + l2cap_sock_kill(sk); + goto response; + } + + l2cap_pi(sk)->chan = chan; + + write_lock_bh(&conn->chan_lock); + + /* Check if we already have channel with that dcid */ + if (__l2cap_get_chan_by_dcid(conn, scid)) { + write_unlock_bh(&conn->chan_lock); + sock_set_flag(sk, SOCK_ZAPPED); + l2cap_sock_kill(sk); + goto response; + } + + hci_conn_hold(conn->hcon); + + l2cap_sock_init(sk, parent); + bacpy(&bt_sk(sk)->src, conn->src); + bacpy(&bt_sk(sk)->dst, conn->dst); + chan->psm = psm; + chan->dcid = scid; + + bt_accept_enqueue(parent, sk); + + __l2cap_chan_add(conn, chan); + + dcid = chan->scid; + + l2cap_sock_set_timer(sk, sk->sk_sndtimeo); + + chan->ident = cmd->ident; + + if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { + if (l2cap_check_security(chan)) { + if (bt_sk(sk)->defer_setup) { + sk->sk_state = BT_CONNECT2; + result = L2CAP_CR_PEND; + status = L2CAP_CS_AUTHOR_PEND; + parent->sk_data_ready(parent, 0); + } else { + sk->sk_state = BT_CONFIG; + result = L2CAP_CR_SUCCESS; + status = L2CAP_CS_NO_INFO; + } + } else { + sk->sk_state = BT_CONNECT2; + result = L2CAP_CR_PEND; + status = L2CAP_CS_AUTHEN_PEND; + } + } else { + sk->sk_state = BT_CONNECT2; + result = L2CAP_CR_PEND; + status = L2CAP_CS_NO_INFO; + } + + write_unlock_bh(&conn->chan_lock); + +response: + bh_unlock_sock(parent); + +sendresp: + rsp.scid = cpu_to_le16(scid); + rsp.dcid = cpu_to_le16(dcid); + rsp.result = cpu_to_le16(result); + rsp.status = cpu_to_le16(status); + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); + + if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { + struct l2cap_info_req info; + info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; + conn->info_ident = l2cap_get_ident(conn); + + mod_timer(&conn->info_timer, jiffies + + msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); + + l2cap_send_cmd(conn, conn->info_ident, + L2CAP_INFO_REQ, sizeof(info), &info); + } + + if (chan && !(chan->conf_state & L2CAP_CONF_REQ_SENT) && + result == L2CAP_CR_SUCCESS) { + u8 buf[128]; + chan->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(chan, buf), buf); + chan->num_conf_req++; + } + + return 0; +} + +static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; + u16 scid, dcid, result, status; + struct l2cap_chan *chan; + struct sock *sk; + u8 req[128]; + + scid = __le16_to_cpu(rsp->scid); + dcid = __le16_to_cpu(rsp->dcid); + result = __le16_to_cpu(rsp->result); + status = __le16_to_cpu(rsp->status); + + BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); + + if (scid) { + chan = l2cap_get_chan_by_scid(conn, scid); + if (!chan) + return -EFAULT; + } else { + chan = l2cap_get_chan_by_ident(conn, cmd->ident); + if (!chan) + return -EFAULT; + } + + sk = chan->sk; + + switch (result) { + case L2CAP_CR_SUCCESS: + sk->sk_state = BT_CONFIG; + chan->ident = 0; + chan->dcid = dcid; + chan->conf_state &= ~L2CAP_CONF_CONNECT_PEND; + + if (chan->conf_state & L2CAP_CONF_REQ_SENT) + break; + + chan->conf_state |= L2CAP_CONF_REQ_SENT; + + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(chan, req), req); + chan->num_conf_req++; + break; + + case L2CAP_CR_PEND: + chan->conf_state |= L2CAP_CONF_CONNECT_PEND; + break; + + default: + /* don't delete l2cap channel if sk is owned by user */ + if (sock_owned_by_user(sk)) { + sk->sk_state = BT_DISCONN; + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ / 5); + break; + } + + l2cap_chan_del(chan, ECONNREFUSED); + break; + } + + bh_unlock_sock(sk); + return 0; +} + +static inline void set_default_fcs(struct l2cap_chan *chan) +{ + struct l2cap_pinfo *pi = l2cap_pi(chan->sk); + + /* FCS is enabled only in ERTM or streaming mode, if one or both + * sides request it. + */ + if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) + chan->fcs = L2CAP_FCS_NONE; + else if (!(pi->chan->conf_state & L2CAP_CONF_NO_FCS_RECV)) + chan->fcs = L2CAP_FCS_CRC16; +} + +static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) +{ + struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; + u16 dcid, flags; + u8 rsp[64]; + struct l2cap_chan *chan; + struct sock *sk; + int len; + + dcid = __le16_to_cpu(req->dcid); + flags = __le16_to_cpu(req->flags); + + BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); + + chan = l2cap_get_chan_by_scid(conn, dcid); + if (!chan) + return -ENOENT; + + sk = chan->sk; + + if (sk->sk_state != BT_CONFIG) { + struct l2cap_cmd_rej rej; + + rej.reason = cpu_to_le16(0x0002); + l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, + sizeof(rej), &rej); + goto unlock; + } + + /* Reject if config buffer is too small. */ + len = cmd_len - sizeof(*req); + if (chan->conf_len + len > sizeof(chan->conf_req)) { + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, + l2cap_build_conf_rsp(chan, rsp, + L2CAP_CONF_REJECT, flags), rsp); + goto unlock; + } + + /* Store config. */ + memcpy(chan->conf_req + chan->conf_len, req->data, len); + chan->conf_len += len; + + if (flags & 0x0001) { + /* Incomplete config. Send empty response. */ + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, + l2cap_build_conf_rsp(chan, rsp, + L2CAP_CONF_SUCCESS, 0x0001), rsp); + goto unlock; + } + + /* Complete config. */ + len = l2cap_parse_conf_req(chan, rsp); + if (len < 0) { + l2cap_send_disconn_req(conn, chan, ECONNRESET); + goto unlock; + } + + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); + chan->num_conf_rsp++; + + /* Reset config buffer. */ + chan->conf_len = 0; + + if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE)) + goto unlock; + + if (chan->conf_state & L2CAP_CONF_INPUT_DONE) { + set_default_fcs(chan); + + sk->sk_state = BT_CONNECTED; + + chan->next_tx_seq = 0; + chan->expected_tx_seq = 0; + skb_queue_head_init(&chan->tx_q); + if (chan->mode == L2CAP_MODE_ERTM) + l2cap_ertm_init(chan); + + l2cap_chan_ready(sk); + goto unlock; + } + + if (!(chan->conf_state & L2CAP_CONF_REQ_SENT)) { + u8 buf[64]; + chan->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(chan, buf), buf); + chan->num_conf_req++; + } + +unlock: + bh_unlock_sock(sk); + return 0; +} + +static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; + u16 scid, flags, result; + struct l2cap_chan *chan; + struct sock *sk; + int len = cmd->len - sizeof(*rsp); + + scid = __le16_to_cpu(rsp->scid); + flags = __le16_to_cpu(rsp->flags); + result = __le16_to_cpu(rsp->result); + + BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", + scid, flags, result); + + chan = l2cap_get_chan_by_scid(conn, scid); + if (!chan) + return 0; + + sk = chan->sk; + + switch (result) { + case L2CAP_CONF_SUCCESS: + l2cap_conf_rfc_get(chan, rsp->data, len); + break; + + case L2CAP_CONF_UNACCEPT: + if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { + char req[64]; + + if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { + l2cap_send_disconn_req(conn, chan, ECONNRESET); + goto done; + } + + /* throw out any old stored conf requests */ + result = L2CAP_CONF_SUCCESS; + len = l2cap_parse_conf_rsp(chan, rsp->data, len, + req, &result); + if (len < 0) { + l2cap_send_disconn_req(conn, chan, ECONNRESET); + goto done; + } + + l2cap_send_cmd(conn, l2cap_get_ident(conn), + L2CAP_CONF_REQ, len, req); + chan->num_conf_req++; + if (result != L2CAP_CONF_SUCCESS) + goto done; + break; + } + + default: + sk->sk_err = ECONNRESET; + l2cap_sock_set_timer(sk, HZ * 5); + l2cap_send_disconn_req(conn, chan, ECONNRESET); + goto done; + } + + if (flags & 0x01) + goto done; + + chan->conf_state |= L2CAP_CONF_INPUT_DONE; + + if (chan->conf_state & L2CAP_CONF_OUTPUT_DONE) { + set_default_fcs(chan); + + sk->sk_state = BT_CONNECTED; + chan->next_tx_seq = 0; + chan->expected_tx_seq = 0; + skb_queue_head_init(&chan->tx_q); + if (chan->mode == L2CAP_MODE_ERTM) + l2cap_ertm_init(chan); + + l2cap_chan_ready(sk); + } + +done: + bh_unlock_sock(sk); + return 0; +} + +static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; + struct l2cap_disconn_rsp rsp; + u16 dcid, scid; + struct l2cap_chan *chan; + struct sock *sk; + + scid = __le16_to_cpu(req->scid); + dcid = __le16_to_cpu(req->dcid); + + BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); + + chan = l2cap_get_chan_by_scid(conn, dcid); + if (!chan) + return 0; + + sk = chan->sk; + + rsp.dcid = cpu_to_le16(chan->scid); + rsp.scid = cpu_to_le16(chan->dcid); + l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); + + sk->sk_shutdown = SHUTDOWN_MASK; + + /* don't delete l2cap channel if sk is owned by user */ + if (sock_owned_by_user(sk)) { + sk->sk_state = BT_DISCONN; + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ / 5); + bh_unlock_sock(sk); + return 0; + } + + l2cap_chan_del(chan, ECONNRESET); + bh_unlock_sock(sk); + + l2cap_sock_kill(sk); + return 0; +} + +static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; + u16 dcid, scid; + struct l2cap_chan *chan; + struct sock *sk; + + scid = __le16_to_cpu(rsp->scid); + dcid = __le16_to_cpu(rsp->dcid); + + BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); + + chan = l2cap_get_chan_by_scid(conn, scid); + if (!chan) + return 0; + + sk = chan->sk; + + /* don't delete l2cap channel if sk is owned by user */ + if (sock_owned_by_user(sk)) { + sk->sk_state = BT_DISCONN; + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ / 5); + bh_unlock_sock(sk); + return 0; + } + + l2cap_chan_del(chan, 0); + bh_unlock_sock(sk); + + l2cap_sock_kill(sk); + return 0; +} + +static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_info_req *req = (struct l2cap_info_req *) data; + u16 type; + + type = __le16_to_cpu(req->type); + + BT_DBG("type 0x%4.4x", type); + + if (type == L2CAP_IT_FEAT_MASK) { + u8 buf[8]; + u32 feat_mask = l2cap_feat_mask; + struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; + rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); + rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); + if (!disable_ertm) + feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING + | L2CAP_FEAT_FCS; + put_unaligned_le32(feat_mask, rsp->data); + l2cap_send_cmd(conn, cmd->ident, + L2CAP_INFO_RSP, sizeof(buf), buf); + } else if (type == L2CAP_IT_FIXED_CHAN) { + u8 buf[12]; + struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; + rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); + rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); + memcpy(buf + 4, l2cap_fixed_chan, 8); + l2cap_send_cmd(conn, cmd->ident, + L2CAP_INFO_RSP, sizeof(buf), buf); + } else { + struct l2cap_info_rsp rsp; + rsp.type = cpu_to_le16(type); + rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); + l2cap_send_cmd(conn, cmd->ident, + L2CAP_INFO_RSP, sizeof(rsp), &rsp); + } + + return 0; +} + +static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; + u16 type, result; + + type = __le16_to_cpu(rsp->type); + result = __le16_to_cpu(rsp->result); + + BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); + + /* L2CAP Info req/rsp are unbound to channels, add extra checks */ + if (cmd->ident != conn->info_ident || + conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) + return 0; + + del_timer(&conn->info_timer); + + if (result != L2CAP_IR_SUCCESS) { + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + + return 0; + } + + if (type == L2CAP_IT_FEAT_MASK) { + conn->feat_mask = get_unaligned_le32(rsp->data); + + if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { + struct l2cap_info_req req; + req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); + + conn->info_ident = l2cap_get_ident(conn); + + l2cap_send_cmd(conn, conn->info_ident, + L2CAP_INFO_REQ, sizeof(req), &req); + } else { + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + } + } else if (type == L2CAP_IT_FIXED_CHAN) { + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + } + + return 0; +} + +static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, + u16 to_multiplier) +{ + u16 max_latency; + + if (min > max || min < 6 || max > 3200) + return -EINVAL; + + if (to_multiplier < 10 || to_multiplier > 3200) + return -EINVAL; + + if (max >= to_multiplier * 8) + return -EINVAL; + + max_latency = (to_multiplier * 8 / max) - 1; + if (latency > 499 || latency > max_latency) + return -EINVAL; + + return 0; +} + +static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, + struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct hci_conn *hcon = conn->hcon; + struct l2cap_conn_param_update_req *req; + struct l2cap_conn_param_update_rsp rsp; + u16 min, max, latency, to_multiplier, cmd_len; + int err; + + if (!(hcon->link_mode & HCI_LM_MASTER)) + return -EINVAL; + + cmd_len = __le16_to_cpu(cmd->len); + if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) + return -EPROTO; + + req = (struct l2cap_conn_param_update_req *) data; + min = __le16_to_cpu(req->min); + max = __le16_to_cpu(req->max); + latency = __le16_to_cpu(req->latency); + to_multiplier = __le16_to_cpu(req->to_multiplier); + + BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", + min, max, latency, to_multiplier); + + memset(&rsp, 0, sizeof(rsp)); + + err = l2cap_check_conn_param(min, max, latency, to_multiplier); + if (err) + rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); + else + rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); + + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, + sizeof(rsp), &rsp); + + if (!err) + hci_le_conn_update(hcon, min, max, latency, to_multiplier); + + return 0; +} + +static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, + struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) +{ + int err = 0; + + switch (cmd->code) { + case L2CAP_COMMAND_REJ: + l2cap_command_rej(conn, cmd, data); + break; + + case L2CAP_CONN_REQ: + err = l2cap_connect_req(conn, cmd, data); + break; + + case L2CAP_CONN_RSP: + err = l2cap_connect_rsp(conn, cmd, data); + break; + + case L2CAP_CONF_REQ: + err = l2cap_config_req(conn, cmd, cmd_len, data); + break; + + case L2CAP_CONF_RSP: + err = l2cap_config_rsp(conn, cmd, data); + break; + + case L2CAP_DISCONN_REQ: + err = l2cap_disconnect_req(conn, cmd, data); + break; + + case L2CAP_DISCONN_RSP: + err = l2cap_disconnect_rsp(conn, cmd, data); + break; + + case L2CAP_ECHO_REQ: + l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); + break; + + case L2CAP_ECHO_RSP: + break; + + case L2CAP_INFO_REQ: + err = l2cap_information_req(conn, cmd, data); + break; + + case L2CAP_INFO_RSP: + err = l2cap_information_rsp(conn, cmd, data); + break; + + default: + BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); + err = -EINVAL; + break; + } + + return err; +} + +static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, + struct l2cap_cmd_hdr *cmd, u8 *data) +{ + switch (cmd->code) { + case L2CAP_COMMAND_REJ: + return 0; + + case L2CAP_CONN_PARAM_UPDATE_REQ: + return l2cap_conn_param_update_req(conn, cmd, data); + + case L2CAP_CONN_PARAM_UPDATE_RSP: + return 0; + + default: + BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); + return -EINVAL; + } +} + +static inline void l2cap_sig_channel(struct l2cap_conn *conn, + struct sk_buff *skb) +{ + u8 *data = skb->data; + int len = skb->len; + struct l2cap_cmd_hdr cmd; + int err; + + l2cap_raw_recv(conn, skb); + + while (len >= L2CAP_CMD_HDR_SIZE) { + u16 cmd_len; + memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); + data += L2CAP_CMD_HDR_SIZE; + len -= L2CAP_CMD_HDR_SIZE; + + cmd_len = le16_to_cpu(cmd.len); + + BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); + + if (cmd_len > len || !cmd.ident) { + BT_DBG("corrupted command"); + break; + } + + if (conn->hcon->type == LE_LINK) + err = l2cap_le_sig_cmd(conn, &cmd, data); + else + err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); + + if (err) { + struct l2cap_cmd_rej rej; + + BT_ERR("Wrong link type (%d)", err); + + /* FIXME: Map err to a valid reason */ + rej.reason = cpu_to_le16(0); + l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); + } + + data += cmd_len; + len -= cmd_len; + } + + kfree_skb(skb); +} + +static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) +{ + u16 our_fcs, rcv_fcs; + int hdr_size = L2CAP_HDR_SIZE + 2; + + if (chan->fcs == L2CAP_FCS_CRC16) { + skb_trim(skb, skb->len - 2); + rcv_fcs = get_unaligned_le16(skb->data + skb->len); + our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); + + if (our_fcs != rcv_fcs) + return -EBADMSG; + } + return 0; +} + +static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) +{ + u16 control = 0; + + chan->frames_sent = 0; + + control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { + control |= L2CAP_SUPER_RCV_NOT_READY; + l2cap_send_sframe(chan, control); + chan->conn_state |= L2CAP_CONN_RNR_SENT; + } + + if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY) + l2cap_retransmit_frames(chan); + + l2cap_ertm_send(chan); + + if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) && + chan->frames_sent == 0) { + control |= L2CAP_SUPER_RCV_READY; + l2cap_send_sframe(chan, control); + } +} + +static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) +{ + struct sk_buff *next_skb; + int tx_seq_offset, next_tx_seq_offset; + + bt_cb(skb)->tx_seq = tx_seq; + bt_cb(skb)->sar = sar; + + next_skb = skb_peek(&chan->srej_q); + if (!next_skb) { + __skb_queue_tail(&chan->srej_q, skb); + return 0; + } + + tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; + if (tx_seq_offset < 0) + tx_seq_offset += 64; + + do { + if (bt_cb(next_skb)->tx_seq == tx_seq) + return -EINVAL; + + next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - + chan->buffer_seq) % 64; + if (next_tx_seq_offset < 0) + next_tx_seq_offset += 64; + + if (next_tx_seq_offset > tx_seq_offset) { + __skb_queue_before(&chan->srej_q, next_skb, skb); + return 0; + } + + if (skb_queue_is_last(&chan->srej_q, next_skb)) + break; + + } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); + + __skb_queue_tail(&chan->srej_q, skb); + + return 0; +} + +static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) +{ + struct sk_buff *_skb; + int err; + + switch (control & L2CAP_CTRL_SAR) { + case L2CAP_SDU_UNSEGMENTED: + if (chan->conn_state & L2CAP_CONN_SAR_SDU) + goto drop; + + err = sock_queue_rcv_skb(chan->sk, skb); + if (!err) + return err; + + break; + + case L2CAP_SDU_START: + if (chan->conn_state & L2CAP_CONN_SAR_SDU) + goto drop; + + chan->sdu_len = get_unaligned_le16(skb->data); + + if (chan->sdu_len > chan->imtu) + goto disconnect; + + chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); + if (!chan->sdu) + return -ENOMEM; + + /* pull sdu_len bytes only after alloc, because of Local Busy + * condition we have to be sure that this will be executed + * only once, i.e., when alloc does not fail */ + skb_pull(skb, 2); + + memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); + + chan->conn_state |= L2CAP_CONN_SAR_SDU; + chan->partial_sdu_len = skb->len; + break; + + case L2CAP_SDU_CONTINUE: + if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) + goto disconnect; + + if (!chan->sdu) + goto disconnect; + + chan->partial_sdu_len += skb->len; + if (chan->partial_sdu_len > chan->sdu_len) + goto drop; + + memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); + + break; + + case L2CAP_SDU_END: + if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) + goto disconnect; + + if (!chan->sdu) + goto disconnect; + + if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) { + chan->partial_sdu_len += skb->len; + + if (chan->partial_sdu_len > chan->imtu) + goto drop; + + if (chan->partial_sdu_len != chan->sdu_len) + goto drop; + + memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); + } + + _skb = skb_clone(chan->sdu, GFP_ATOMIC); + if (!_skb) { + chan->conn_state |= L2CAP_CONN_SAR_RETRY; + return -ENOMEM; + } + + err = sock_queue_rcv_skb(chan->sk, _skb); + if (err < 0) { + kfree_skb(_skb); + chan->conn_state |= L2CAP_CONN_SAR_RETRY; + return err; + } + + chan->conn_state &= ~L2CAP_CONN_SAR_RETRY; + chan->conn_state &= ~L2CAP_CONN_SAR_SDU; + + kfree_skb(chan->sdu); + break; + } + + kfree_skb(skb); + return 0; + +drop: + kfree_skb(chan->sdu); + chan->sdu = NULL; + +disconnect: + l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); + kfree_skb(skb); + return 0; +} + +static int l2cap_try_push_rx_skb(struct l2cap_chan *chan) +{ + struct sk_buff *skb; + u16 control; + int err; + + while ((skb = skb_dequeue(&chan->busy_q))) { + control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; + err = l2cap_ertm_reassembly_sdu(chan, skb, control); + if (err < 0) { + skb_queue_head(&chan->busy_q, skb); + return -EBUSY; + } + + chan->buffer_seq = (chan->buffer_seq + 1) % 64; + } + + if (!(chan->conn_state & L2CAP_CONN_RNR_SENT)) + goto done; + + control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; + l2cap_send_sframe(chan, control); + chan->retry_count = 1; + + del_timer(&chan->retrans_timer); + __mod_monitor_timer(); + + chan->conn_state |= L2CAP_CONN_WAIT_F; + +done: + chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; + chan->conn_state &= ~L2CAP_CONN_RNR_SENT; + + BT_DBG("chan %p, Exit local busy", chan); + + return 0; +} + +static void l2cap_busy_work(struct work_struct *work) +{ + DECLARE_WAITQUEUE(wait, current); + struct l2cap_chan *chan = + container_of(work, struct l2cap_chan, busy_work); + struct sock *sk = chan->sk; + int n_tries = 0, timeo = HZ/5, err; + struct sk_buff *skb; + + lock_sock(sk); + + add_wait_queue(sk_sleep(sk), &wait); + while ((skb = skb_peek(&chan->busy_q))) { + set_current_state(TASK_INTERRUPTIBLE); + + if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { + err = -EBUSY; + l2cap_send_disconn_req(chan->conn, chan, EBUSY); + break; + } + + if (!timeo) + timeo = HZ/5; + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock(sk); + + err = sock_error(sk); + if (err) + break; + + if (l2cap_try_push_rx_skb(chan) == 0) + break; + } + + set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + + release_sock(sk); +} + +static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) +{ + int sctrl, err; + + if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { + bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; + __skb_queue_tail(&chan->busy_q, skb); + return l2cap_try_push_rx_skb(chan); + + + } + + err = l2cap_ertm_reassembly_sdu(chan, skb, control); + if (err >= 0) { + chan->buffer_seq = (chan->buffer_seq + 1) % 64; + return err; + } + + /* Busy Condition */ + BT_DBG("chan %p, Enter local busy", chan); + + chan->conn_state |= L2CAP_CONN_LOCAL_BUSY; + bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; + __skb_queue_tail(&chan->busy_q, skb); + + sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + sctrl |= L2CAP_SUPER_RCV_NOT_READY; + l2cap_send_sframe(chan, sctrl); + + chan->conn_state |= L2CAP_CONN_RNR_SENT; + + del_timer(&chan->ack_timer); + + queue_work(_busy_wq, &chan->busy_work); + + return err; +} + +static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) +{ + struct sk_buff *_skb; + int err = -EINVAL; + + /* + * TODO: We have to notify the userland if some data is lost with the + * Streaming Mode. + */ + + switch (control & L2CAP_CTRL_SAR) { + case L2CAP_SDU_UNSEGMENTED: + if (chan->conn_state & L2CAP_CONN_SAR_SDU) { + kfree_skb(chan->sdu); + break; + } + + err = sock_queue_rcv_skb(chan->sk, skb); + if (!err) + return 0; + + break; + + case L2CAP_SDU_START: + if (chan->conn_state & L2CAP_CONN_SAR_SDU) { + kfree_skb(chan->sdu); + break; + } + + chan->sdu_len = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + + if (chan->sdu_len > chan->imtu) { + err = -EMSGSIZE; + break; + } + + chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); + if (!chan->sdu) { + err = -ENOMEM; + break; + } + + memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); + + chan->conn_state |= L2CAP_CONN_SAR_SDU; + chan->partial_sdu_len = skb->len; + err = 0; + break; + + case L2CAP_SDU_CONTINUE: + if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) + break; + + memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); + + chan->partial_sdu_len += skb->len; + if (chan->partial_sdu_len > chan->sdu_len) + kfree_skb(chan->sdu); + else + err = 0; + + break; + + case L2CAP_SDU_END: + if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) + break; + + memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); + + chan->conn_state &= ~L2CAP_CONN_SAR_SDU; + chan->partial_sdu_len += skb->len; + + if (chan->partial_sdu_len > chan->imtu) + goto drop; + + if (chan->partial_sdu_len == chan->sdu_len) { + _skb = skb_clone(chan->sdu, GFP_ATOMIC); + err = sock_queue_rcv_skb(chan->sk, _skb); + if (err < 0) + kfree_skb(_skb); + } + err = 0; + +drop: + kfree_skb(chan->sdu); + break; + } + + kfree_skb(skb); + return err; +} + +static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) +{ + struct sk_buff *skb; + u16 control; + + while ((skb = skb_peek(&chan->srej_q))) { + if (bt_cb(skb)->tx_seq != tx_seq) + break; + + skb = skb_dequeue(&chan->srej_q); + control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; + l2cap_ertm_reassembly_sdu(chan, skb, control); + chan->buffer_seq_srej = + (chan->buffer_seq_srej + 1) % 64; + tx_seq = (tx_seq + 1) % 64; + } +} + +static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) +{ + struct srej_list *l, *tmp; + u16 control; + + list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { + if (l->tx_seq == tx_seq) { + list_del(&l->list); + kfree(l); + return; + } + control = L2CAP_SUPER_SELECT_REJECT; + control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; + l2cap_send_sframe(chan, control); + list_del(&l->list); + list_add_tail(&l->list, &chan->srej_l); + } +} + +static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) +{ + struct srej_list *new; + u16 control; + + while (tx_seq != chan->expected_tx_seq) { + control = L2CAP_SUPER_SELECT_REJECT; + control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; + l2cap_send_sframe(chan, control); + + new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); + new->tx_seq = chan->expected_tx_seq; + chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; + list_add_tail(&new->list, &chan->srej_l); + } + chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; +} + +static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) +{ + u8 tx_seq = __get_txseq(rx_control); + u8 req_seq = __get_reqseq(rx_control); + u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; + int tx_seq_offset, expected_tx_seq_offset; + int num_to_ack = (chan->tx_win/6) + 1; + int err = 0; + + BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, + tx_seq, rx_control); + + if (L2CAP_CTRL_FINAL & rx_control && + chan->conn_state & L2CAP_CONN_WAIT_F) { + del_timer(&chan->monitor_timer); + if (chan->unacked_frames > 0) + __mod_retrans_timer(); + chan->conn_state &= ~L2CAP_CONN_WAIT_F; + } + + chan->expected_ack_seq = req_seq; + l2cap_drop_acked_frames(chan); + + if (tx_seq == chan->expected_tx_seq) + goto expected; + + tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; + if (tx_seq_offset < 0) + tx_seq_offset += 64; + + /* invalid tx_seq */ + if (tx_seq_offset >= chan->tx_win) { + l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); + goto drop; + } + + if (chan->conn_state == L2CAP_CONN_LOCAL_BUSY) + goto drop; + + if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { + struct srej_list *first; + + first = list_first_entry(&chan->srej_l, + struct srej_list, list); + if (tx_seq == first->tx_seq) { + l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); + l2cap_check_srej_gap(chan, tx_seq); + + list_del(&first->list); + kfree(first); + + if (list_empty(&chan->srej_l)) { + chan->buffer_seq = chan->buffer_seq_srej; + chan->conn_state &= ~L2CAP_CONN_SREJ_SENT; + l2cap_send_ack(chan); + BT_DBG("chan %p, Exit SREJ_SENT", chan); + } + } else { + struct srej_list *l; + + /* duplicated tx_seq */ + if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) + goto drop; + + list_for_each_entry(l, &chan->srej_l, list) { + if (l->tx_seq == tx_seq) { + l2cap_resend_srejframe(chan, tx_seq); + return 0; + } + } + l2cap_send_srejframe(chan, tx_seq); + } + } else { + expected_tx_seq_offset = + (chan->expected_tx_seq - chan->buffer_seq) % 64; + if (expected_tx_seq_offset < 0) + expected_tx_seq_offset += 64; + + /* duplicated tx_seq */ + if (tx_seq_offset < expected_tx_seq_offset) + goto drop; + + chan->conn_state |= L2CAP_CONN_SREJ_SENT; + + BT_DBG("chan %p, Enter SREJ", chan); + + INIT_LIST_HEAD(&chan->srej_l); + chan->buffer_seq_srej = chan->buffer_seq; + + __skb_queue_head_init(&chan->srej_q); + __skb_queue_head_init(&chan->busy_q); + l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); + + chan->conn_state |= L2CAP_CONN_SEND_PBIT; + + l2cap_send_srejframe(chan, tx_seq); + + del_timer(&chan->ack_timer); + } + return 0; + +expected: + chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; + + if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { + bt_cb(skb)->tx_seq = tx_seq; + bt_cb(skb)->sar = sar; + __skb_queue_tail(&chan->srej_q, skb); + return 0; + } + + err = l2cap_push_rx_skb(chan, skb, rx_control); + if (err < 0) + return 0; + + if (rx_control & L2CAP_CTRL_FINAL) { + if (chan->conn_state & L2CAP_CONN_REJ_ACT) + chan->conn_state &= ~L2CAP_CONN_REJ_ACT; + else + l2cap_retransmit_frames(chan); + } + + __mod_ack_timer(); + + chan->num_acked = (chan->num_acked + 1) % num_to_ack; + if (chan->num_acked == num_to_ack - 1) + l2cap_send_ack(chan); + + return 0; + +drop: + kfree_skb(skb); + return 0; +} + +static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) +{ + BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), + rx_control); + + chan->expected_ack_seq = __get_reqseq(rx_control); + l2cap_drop_acked_frames(chan); + + if (rx_control & L2CAP_CTRL_POLL) { + chan->conn_state |= L2CAP_CONN_SEND_FBIT; + if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { + if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && + (chan->unacked_frames > 0)) + __mod_retrans_timer(); + + chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + l2cap_send_srejtail(chan); + } else { + l2cap_send_i_or_rr_or_rnr(chan); + } + + } else if (rx_control & L2CAP_CTRL_FINAL) { + chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + + if (chan->conn_state & L2CAP_CONN_REJ_ACT) + chan->conn_state &= ~L2CAP_CONN_REJ_ACT; + else + l2cap_retransmit_frames(chan); + + } else { + if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && + (chan->unacked_frames > 0)) + __mod_retrans_timer(); + + chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + if (chan->conn_state & L2CAP_CONN_SREJ_SENT) + l2cap_send_ack(chan); + else + l2cap_ertm_send(chan); + } +} + +static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) +{ + u8 tx_seq = __get_reqseq(rx_control); + + BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); + + chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + + chan->expected_ack_seq = tx_seq; + l2cap_drop_acked_frames(chan); + + if (rx_control & L2CAP_CTRL_FINAL) { + if (chan->conn_state & L2CAP_CONN_REJ_ACT) + chan->conn_state &= ~L2CAP_CONN_REJ_ACT; + else + l2cap_retransmit_frames(chan); + } else { + l2cap_retransmit_frames(chan); + + if (chan->conn_state & L2CAP_CONN_WAIT_F) + chan->conn_state |= L2CAP_CONN_REJ_ACT; + } +} +static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) +{ + u8 tx_seq = __get_reqseq(rx_control); + + BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); + + chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + + if (rx_control & L2CAP_CTRL_POLL) { + chan->expected_ack_seq = tx_seq; + l2cap_drop_acked_frames(chan); + + chan->conn_state |= L2CAP_CONN_SEND_FBIT; + l2cap_retransmit_one_frame(chan, tx_seq); + + l2cap_ertm_send(chan); + + if (chan->conn_state & L2CAP_CONN_WAIT_F) { + chan->srej_save_reqseq = tx_seq; + chan->conn_state |= L2CAP_CONN_SREJ_ACT; + } + } else if (rx_control & L2CAP_CTRL_FINAL) { + if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) && + chan->srej_save_reqseq == tx_seq) + chan->conn_state &= ~L2CAP_CONN_SREJ_ACT; + else + l2cap_retransmit_one_frame(chan, tx_seq); + } else { + l2cap_retransmit_one_frame(chan, tx_seq); + if (chan->conn_state & L2CAP_CONN_WAIT_F) { + chan->srej_save_reqseq = tx_seq; + chan->conn_state |= L2CAP_CONN_SREJ_ACT; + } + } +} + +static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) +{ + u8 tx_seq = __get_reqseq(rx_control); + + BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); + + chan->conn_state |= L2CAP_CONN_REMOTE_BUSY; + chan->expected_ack_seq = tx_seq; + l2cap_drop_acked_frames(chan); + + if (rx_control & L2CAP_CTRL_POLL) + chan->conn_state |= L2CAP_CONN_SEND_FBIT; + + if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) { + del_timer(&chan->retrans_timer); + if (rx_control & L2CAP_CTRL_POLL) + l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); + return; + } + + if (rx_control & L2CAP_CTRL_POLL) + l2cap_send_srejtail(chan); + else + l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); +} + +static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) +{ + BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); + + if (L2CAP_CTRL_FINAL & rx_control && + chan->conn_state & L2CAP_CONN_WAIT_F) { + del_timer(&chan->monitor_timer); + if (chan->unacked_frames > 0) + __mod_retrans_timer(); + chan->conn_state &= ~L2CAP_CONN_WAIT_F; + } + + switch (rx_control & L2CAP_CTRL_SUPERVISE) { + case L2CAP_SUPER_RCV_READY: + l2cap_data_channel_rrframe(chan, rx_control); + break; + + case L2CAP_SUPER_REJECT: + l2cap_data_channel_rejframe(chan, rx_control); + break; + + case L2CAP_SUPER_SELECT_REJECT: + l2cap_data_channel_srejframe(chan, rx_control); + break; + + case L2CAP_SUPER_RCV_NOT_READY: + l2cap_data_channel_rnrframe(chan, rx_control); + break; + } + + kfree_skb(skb); + return 0; +} + +static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) +{ + struct l2cap_chan *chan = l2cap_pi(sk)->chan; + u16 control; + u8 req_seq; + int len, next_tx_seq_offset, req_seq_offset; + + control = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + len = skb->len; + + /* + * We can just drop the corrupted I-frame here. + * Receiver will miss it and start proper recovery + * procedures and ask retransmission. + */ + if (l2cap_check_fcs(chan, skb)) + goto drop; + + if (__is_sar_start(control) && __is_iframe(control)) + len -= 2; + + if (chan->fcs == L2CAP_FCS_CRC16) + len -= 2; + + if (len > chan->mps) { + l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); + goto drop; + } + + req_seq = __get_reqseq(control); + req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; + if (req_seq_offset < 0) + req_seq_offset += 64; + + next_tx_seq_offset = + (chan->next_tx_seq - chan->expected_ack_seq) % 64; + if (next_tx_seq_offset < 0) + next_tx_seq_offset += 64; + + /* check for invalid req-seq */ + if (req_seq_offset > next_tx_seq_offset) { + l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); + goto drop; + } + + if (__is_iframe(control)) { + if (len < 0) { + l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); + goto drop; + } + + l2cap_data_channel_iframe(chan, control, skb); + } else { + if (len != 0) { + BT_ERR("%d", len); + l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); + goto drop; + } + + l2cap_data_channel_sframe(chan, control, skb); + } + + return 0; + +drop: + kfree_skb(skb); + return 0; +} + +static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) +{ + struct l2cap_chan *chan; + struct sock *sk = NULL; + struct l2cap_pinfo *pi; + u16 control; + u8 tx_seq; + int len; + + chan = l2cap_get_chan_by_scid(conn, cid); + if (!chan) { + BT_DBG("unknown cid 0x%4.4x", cid); + goto drop; + } + + sk = chan->sk; + pi = l2cap_pi(sk); + + BT_DBG("chan %p, len %d", chan, skb->len); + + if (sk->sk_state != BT_CONNECTED) + goto drop; + + switch (chan->mode) { + case L2CAP_MODE_BASIC: + /* If socket recv buffers overflows we drop data here + * which is *bad* because L2CAP has to be reliable. + * But we don't have any other choice. L2CAP doesn't + * provide flow control mechanism. */ + + if (chan->imtu < skb->len) + goto drop; + + if (!sock_queue_rcv_skb(sk, skb)) + goto done; + break; + + case L2CAP_MODE_ERTM: + if (!sock_owned_by_user(sk)) { + l2cap_ertm_data_rcv(sk, skb); + } else { + if (sk_add_backlog(sk, skb)) + goto drop; + } + + goto done; + + case L2CAP_MODE_STREAMING: + control = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + len = skb->len; + + if (l2cap_check_fcs(chan, skb)) + goto drop; + + if (__is_sar_start(control)) + len -= 2; + + if (chan->fcs == L2CAP_FCS_CRC16) + len -= 2; + + if (len > chan->mps || len < 0 || __is_sframe(control)) + goto drop; + + tx_seq = __get_txseq(control); + + if (chan->expected_tx_seq == tx_seq) + chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; + else + chan->expected_tx_seq = (tx_seq + 1) % 64; + + l2cap_streaming_reassembly_sdu(chan, skb, control); + + goto done; + + default: + BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); + break; + } + +drop: + kfree_skb(skb); + +done: + if (sk) + bh_unlock_sock(sk); + + return 0; +} + +static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) +{ + struct sock *sk = NULL; + struct l2cap_chan *chan; + + chan = l2cap_global_chan_by_psm(0, psm, conn->src); + if (!chan) + goto drop; + + sk = chan->sk; + + bh_lock_sock(sk); + + BT_DBG("sk %p, len %d", sk, skb->len); + + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) + goto drop; + + if (l2cap_pi(sk)->chan->imtu < skb->len) + goto drop; + + if (!sock_queue_rcv_skb(sk, skb)) + goto done; + +drop: + kfree_skb(skb); + +done: + if (sk) + bh_unlock_sock(sk); + return 0; +} + +static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) +{ + struct sock *sk = NULL; + struct l2cap_chan *chan; + + chan = l2cap_global_chan_by_scid(0, cid, conn->src); + if (!chan) + goto drop; + + sk = chan->sk; + + bh_lock_sock(sk); + + BT_DBG("sk %p, len %d", sk, skb->len); + + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) + goto drop; + + if (l2cap_pi(sk)->chan->imtu < skb->len) + goto drop; + + if (!sock_queue_rcv_skb(sk, skb)) + goto done; + +drop: + kfree_skb(skb); + +done: + if (sk) + bh_unlock_sock(sk); + return 0; +} + +static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) +{ + struct l2cap_hdr *lh = (void *) skb->data; + u16 cid, len; + __le16 psm; + + skb_pull(skb, L2CAP_HDR_SIZE); + cid = __le16_to_cpu(lh->cid); + len = __le16_to_cpu(lh->len); + + if (len != skb->len) { + kfree_skb(skb); + return; + } + + BT_DBG("len %d, cid 0x%4.4x", len, cid); + + switch (cid) { + case L2CAP_CID_LE_SIGNALING: + case L2CAP_CID_SIGNALING: + l2cap_sig_channel(conn, skb); + break; + + case L2CAP_CID_CONN_LESS: + psm = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + l2cap_conless_channel(conn, psm, skb); + break; + + case L2CAP_CID_LE_DATA: + l2cap_att_channel(conn, cid, skb); + break; + + default: + l2cap_data_channel(conn, cid, skb); + break; + } +} + +/* ---- L2CAP interface with lower layer (HCI) ---- */ + +static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) +{ + int exact = 0, lm1 = 0, lm2 = 0; + struct l2cap_chan *c; + + if (type != ACL_LINK) + return -EINVAL; + + BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); + + /* Find listening sockets and check their link_mode */ + read_lock(&chan_list_lock); + list_for_each_entry(c, &chan_list, global_l) { + struct sock *sk = c->sk; + + if (sk->sk_state != BT_LISTEN) + continue; + + if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { + lm1 |= HCI_LM_ACCEPT; + if (c->role_switch) + lm1 |= HCI_LM_MASTER; + exact++; + } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { + lm2 |= HCI_LM_ACCEPT; + if (c->role_switch) + lm2 |= HCI_LM_MASTER; + } + } + read_unlock(&chan_list_lock); + + return exact ? lm1 : lm2; +} + +static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) +{ + struct l2cap_conn *conn; + + BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); + + if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) + return -EINVAL; + + if (!status) { + conn = l2cap_conn_add(hcon, status); + if (conn) + l2cap_conn_ready(conn); + } else + l2cap_conn_del(hcon, bt_err(status)); + + return 0; +} + +static int l2cap_disconn_ind(struct hci_conn *hcon) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + BT_DBG("hcon %p", hcon); + + if (hcon->type != ACL_LINK || !conn) + return 0x13; + + return conn->disc_reason; +} + +static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) +{ + BT_DBG("hcon %p reason %d", hcon, reason); + + if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) + return -EINVAL; + + l2cap_conn_del(hcon, bt_err(reason)); + + return 0; +} + +static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) +{ + struct sock *sk = chan->sk; + + if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) + return; + + if (encrypt == 0x00) { + if (chan->sec_level == BT_SECURITY_MEDIUM) { + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ * 5); + } else if (chan->sec_level == BT_SECURITY_HIGH) + __l2cap_sock_close(sk, ECONNREFUSED); + } else { + if (chan->sec_level == BT_SECURITY_MEDIUM) + l2cap_sock_clear_timer(sk); + } +} + +static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + struct l2cap_chan *chan; + + if (!conn) + return 0; + + BT_DBG("conn %p", conn); + + read_lock(&conn->chan_lock); + + list_for_each_entry(chan, &conn->chan_l, list) { + struct sock *sk = chan->sk; + + bh_lock_sock(sk); + + if (chan->conf_state & L2CAP_CONF_CONNECT_PEND) { + bh_unlock_sock(sk); + continue; + } + + if (!status && (sk->sk_state == BT_CONNECTED || + sk->sk_state == BT_CONFIG)) { + l2cap_check_encryption(chan, encrypt); + bh_unlock_sock(sk); + continue; + } + + if (sk->sk_state == BT_CONNECT) { + if (!status) { + struct l2cap_conn_req req; + req.scid = cpu_to_le16(chan->scid); + req.psm = chan->psm; + + chan->ident = l2cap_get_ident(conn); + chan->conf_state |= L2CAP_CONF_CONNECT_PEND; + + l2cap_send_cmd(conn, chan->ident, + L2CAP_CONN_REQ, sizeof(req), &req); + } else { + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ / 10); + } + } else if (sk->sk_state == BT_CONNECT2) { + struct l2cap_conn_rsp rsp; + __u16 result; + + if (!status) { + sk->sk_state = BT_CONFIG; + result = L2CAP_CR_SUCCESS; + } else { + sk->sk_state = BT_DISCONN; + l2cap_sock_set_timer(sk, HZ / 10); + result = L2CAP_CR_SEC_BLOCK; + } + + rsp.scid = cpu_to_le16(chan->dcid); + rsp.dcid = cpu_to_le16(chan->scid); + rsp.result = cpu_to_le16(result); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, + sizeof(rsp), &rsp); + } + + bh_unlock_sock(sk); + } + + read_unlock(&conn->chan_lock); + + return 0; +} + +static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + if (!conn) + conn = l2cap_conn_add(hcon, 0); + + if (!conn) + goto drop; + + BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); + + if (!(flags & ACL_CONT)) { + struct l2cap_hdr *hdr; + struct l2cap_chan *chan; + u16 cid; + int len; + + if (conn->rx_len) { + BT_ERR("Unexpected start frame (len %d)", skb->len); + kfree_skb(conn->rx_skb); + conn->rx_skb = NULL; + conn->rx_len = 0; + l2cap_conn_unreliable(conn, ECOMM); + } + + /* Start fragment always begin with Basic L2CAP header */ + if (skb->len < L2CAP_HDR_SIZE) { + BT_ERR("Frame is too short (len %d)", skb->len); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + hdr = (struct l2cap_hdr *) skb->data; + len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; + cid = __le16_to_cpu(hdr->cid); + + if (len == skb->len) { + /* Complete frame received */ + l2cap_recv_frame(conn, skb); + return 0; + } + + BT_DBG("Start: total len %d, frag len %d", len, skb->len); + + if (skb->len > len) { + BT_ERR("Frame is too long (len %d, expected len %d)", + skb->len, len); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + chan = l2cap_get_chan_by_scid(conn, cid); + + if (chan && chan->sk) { + struct sock *sk = chan->sk; + + if (chan->imtu < len - L2CAP_HDR_SIZE) { + BT_ERR("Frame exceeding recv MTU (len %d, " + "MTU %d)", len, + chan->imtu); + bh_unlock_sock(sk); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + bh_unlock_sock(sk); + } + + /* Allocate skb for the complete frame (with header) */ + conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); + if (!conn->rx_skb) + goto drop; + + skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), + skb->len); + conn->rx_len = len - skb->len; + } else { + BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); + + if (!conn->rx_len) { + BT_ERR("Unexpected continuation frame (len %d)", skb->len); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + if (skb->len > conn->rx_len) { + BT_ERR("Fragment is too long (len %d, expected %d)", + skb->len, conn->rx_len); + kfree_skb(conn->rx_skb); + conn->rx_skb = NULL; + conn->rx_len = 0; + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), + skb->len); + conn->rx_len -= skb->len; + + if (!conn->rx_len) { + /* Complete frame received */ + l2cap_recv_frame(conn, conn->rx_skb); + conn->rx_skb = NULL; + } + } + +drop: + kfree_skb(skb); + return 0; +} + +static int l2cap_debugfs_show(struct seq_file *f, void *p) +{ + struct l2cap_chan *c; + + read_lock_bh(&chan_list_lock); + + list_for_each_entry(c, &chan_list, global_l) { + struct sock *sk = c->sk; + + seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", + batostr(&bt_sk(sk)->src), + batostr(&bt_sk(sk)->dst), + sk->sk_state, __le16_to_cpu(c->psm), + c->scid, c->dcid, c->imtu, c->omtu, + c->sec_level, c->mode); + } + + read_unlock_bh(&chan_list_lock); + + return 0; +} + +static int l2cap_debugfs_open(struct inode *inode, struct file *file) +{ + return single_open(file, l2cap_debugfs_show, inode->i_private); +} + +static const struct file_operations l2cap_debugfs_fops = { + .open = l2cap_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct dentry *l2cap_debugfs; + +static struct hci_proto l2cap_hci_proto = { + .name = "L2CAP", + .id = HCI_PROTO_L2CAP, + .connect_ind = l2cap_connect_ind, + .connect_cfm = l2cap_connect_cfm, + .disconn_ind = l2cap_disconn_ind, + .disconn_cfm = l2cap_disconn_cfm, + .security_cfm = l2cap_security_cfm, + .recv_acldata = l2cap_recv_acldata +}; + +int __init l2cap_init(void) +{ + int err; + + err = l2cap_init_sockets(); + if (err < 0) + return err; + + _busy_wq = create_singlethread_workqueue("l2cap"); + if (!_busy_wq) { + err = -ENOMEM; + goto error; + } + + err = hci_register_proto(&l2cap_hci_proto); + if (err < 0) { + BT_ERR("L2CAP protocol registration failed"); + bt_sock_unregister(BTPROTO_L2CAP); + goto error; + } + + if (bt_debugfs) { + l2cap_debugfs = debugfs_create_file("l2cap", 0444, + bt_debugfs, NULL, &l2cap_debugfs_fops); + if (!l2cap_debugfs) + BT_ERR("Failed to create L2CAP debug file"); + } + + return 0; + +error: + destroy_workqueue(_busy_wq); + l2cap_cleanup_sockets(); + return err; +} + +void l2cap_exit(void) +{ + debugfs_remove(l2cap_debugfs); + + flush_workqueue(_busy_wq); + destroy_workqueue(_busy_wq); + + if (hci_unregister_proto(&l2cap_hci_proto) < 0) + BT_ERR("L2CAP protocol unregistration failed"); + + l2cap_cleanup_sockets(); +} + +module_param(disable_ertm, bool, 0644); +MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 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