diff options
Diffstat (limited to 'net/bluetooth_tizen/l2cap_core.c')
-rw-r--r-- | net/bluetooth_tizen/l2cap_core.c | 4803 |
1 files changed, 0 insertions, 4803 deletions
diff --git a/net/bluetooth_tizen/l2cap_core.c b/net/bluetooth_tizen/l2cap_core.c deleted file mode 100644 index 48268ab..0000000 --- a/net/bluetooth_tizen/l2cap_core.c +++ /dev/null @@ -1,4803 +0,0 @@ -/* - 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. - Copyright (C) 2011 ProFUSION Embedded Systems - - 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> -#include <net/bluetooth/smp.h> - -bool disable_ertm; - -static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; -static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; - -static LIST_HEAD(chan_list); -static DEFINE_RWLOCK(chan_list_lock); - -static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, - u8 code, u8 ident, u16 dlen, void *data); -static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, - void *data); -static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); -static void l2cap_send_disconn_req(struct l2cap_conn *conn, - struct l2cap_chan *chan, int err); - -/* ---- 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 channel. */ -static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) -{ - struct l2cap_chan *c; - - mutex_lock(&conn->chan_lock); - c = __l2cap_get_chan_by_scid(conn, cid); - if (c) - l2cap_chan_lock(c); - mutex_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; - - mutex_lock(&conn->chan_lock); - c = __l2cap_get_chan_by_ident(conn, ident); - mutex_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)) - return c; - } - return NULL; -} - -int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) -{ - int err; - - write_lock(&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(&chan_list_lock); - return err; -} - -int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) -{ - write_lock(&chan_list_lock); - - chan->scid = scid; - - write_unlock(&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; -} - -static void __l2cap_state_change(struct l2cap_chan *chan, int state) -{ - BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), - state_to_string(state)); - - chan->state = state; - chan->ops->state_change(chan->data, state); -} - -static void l2cap_state_change(struct l2cap_chan *chan, int state) -{ - struct sock *sk = chan->sk; - - lock_sock(sk); - __l2cap_state_change(chan, state); - release_sock(sk); -} - -static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) -{ - struct sock *sk = chan->sk; - - sk->sk_err = err; -} - -static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) -{ - struct sock *sk = chan->sk; - - lock_sock(sk); - __l2cap_chan_set_err(chan, err); - release_sock(sk); -} - -static void l2cap_chan_timeout(struct work_struct *work) -{ - struct l2cap_chan *chan = container_of(work, struct l2cap_chan, - chan_timer.work); - struct l2cap_conn *conn = chan->conn; - int reason; - - BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); - - mutex_lock(&conn->chan_lock); - l2cap_chan_lock(chan); - - if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) - reason = ECONNREFUSED; - else if (chan->state == BT_CONNECT && - chan->sec_level != BT_SECURITY_SDP) - reason = ECONNREFUSED; - else - reason = ETIMEDOUT; - - l2cap_chan_close(chan, reason); - - l2cap_chan_unlock(chan); - - chan->ops->close(chan->data); - mutex_unlock(&conn->chan_lock); - - l2cap_chan_put(chan); -} - -struct l2cap_chan *l2cap_chan_create(struct sock *sk) -{ - struct l2cap_chan *chan; - - chan = kzalloc(sizeof(*chan), GFP_ATOMIC); - if (!chan) - return NULL; - - mutex_init(&chan->lock); - - chan->sk = sk; - - write_lock(&chan_list_lock); - list_add(&chan->global_l, &chan_list); - write_unlock(&chan_list_lock); - - INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); - - chan->state = BT_OPEN; - - atomic_set(&chan->refcnt, 1); - - BT_DBG("sk %p chan %p", sk, chan); - - return chan; -} - -void l2cap_chan_destroy(struct l2cap_chan *chan) -{ - write_lock(&chan_list_lock); - list_del(&chan->global_l); - write_unlock(&chan_list_lock); - - l2cap_chan_put(chan); -} - -void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) -{ - BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, - chan->psm, chan->dcid); - - conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; - - chan->conn = conn; - - switch (chan->chan_type) { - case L2CAP_CHAN_CONN_ORIENTED: - 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; - } - break; - - case L2CAP_CHAN_CONN_LESS: - /* Connectionless socket */ - chan->scid = L2CAP_CID_CONN_LESS; - chan->dcid = L2CAP_CID_CONN_LESS; - chan->omtu = L2CAP_DEFAULT_MTU; - break; - - default: - /* Raw socket can send/recv signalling messages only */ - chan->scid = L2CAP_CID_SIGNALING; - chan->dcid = L2CAP_CID_SIGNALING; - chan->omtu = L2CAP_DEFAULT_MTU; - } - - chan->local_id = L2CAP_BESTEFFORT_ID; - chan->local_stype = L2CAP_SERV_BESTEFFORT; - chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; - chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; - chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; - chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; - - l2cap_chan_hold(chan); - - list_add(&chan->list, &conn->chan_l); -} - -void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) -{ - mutex_lock(&conn->chan_lock); - __l2cap_chan_add(conn, chan); - mutex_unlock(&conn->chan_lock); -} - -static 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; - - __clear_chan_timer(chan); - - BT_DBG("chan %p, conn %p, err %d", chan, conn, err); - - if (conn) { - /* Delete from channel list */ - list_del(&chan->list); - - l2cap_chan_put(chan); - - chan->conn = NULL; - hci_conn_put(conn->hcon); - } - - lock_sock(sk); - - __l2cap_state_change(chan, BT_CLOSED); - sock_set_flag(sk, SOCK_ZAPPED); - - if (err) - __l2cap_chan_set_err(chan, err); - - if (parent) { - bt_accept_unlink(sk); - parent->sk_data_ready(parent, 0); - } else - sk->sk_state_change(sk); - - release_sock(sk); - - if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) && - test_bit(CONF_INPUT_DONE, &chan->conf_state))) - return; - - skb_queue_purge(&chan->tx_q); - - if (chan->mode == L2CAP_MODE_ERTM) { - struct srej_list *l, *tmp; - - __clear_retrans_timer(chan); - __clear_monitor_timer(chan); - __clear_ack_timer(chan); - - skb_queue_purge(&chan->srej_q); - - list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { - list_del(&l->list); - kfree(l); - } - } -} - -static void l2cap_chan_cleanup_listen(struct sock *parent) -{ - struct sock *sk; - - BT_DBG("parent %p", parent); - - /* Close not yet accepted channels */ - while ((sk = bt_accept_dequeue(parent, NULL))) { - struct l2cap_chan *chan = l2cap_pi(sk)->chan; - - l2cap_chan_lock(chan); - __clear_chan_timer(chan); - l2cap_chan_close(chan, ECONNRESET); - l2cap_chan_unlock(chan); - - chan->ops->close(chan->data); - } -} - -void l2cap_chan_close(struct l2cap_chan *chan, int reason) -{ - struct l2cap_conn *conn = chan->conn; - struct sock *sk = chan->sk; - - BT_DBG("chan %p state %s sk %p", chan, - state_to_string(chan->state), sk); - - switch (chan->state) { - case BT_LISTEN: - lock_sock(sk); - l2cap_chan_cleanup_listen(sk); - - __l2cap_state_change(chan, BT_CLOSED); - sock_set_flag(sk, SOCK_ZAPPED); - release_sock(sk); - break; - - case BT_CONNECTED: - case BT_CONFIG: - if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && - conn->hcon->type == ACL_LINK) { - __clear_chan_timer(chan); - __set_chan_timer(chan, sk->sk_sndtimeo); - l2cap_send_disconn_req(conn, chan, reason); - } else - l2cap_chan_del(chan, reason); - break; - - case BT_CONNECT2: - if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && - conn->hcon->type == ACL_LINK) { - struct l2cap_conn_rsp rsp; - __u16 result; - - if (bt_sk(sk)->defer_setup) - result = L2CAP_CR_SEC_BLOCK; - else - result = L2CAP_CR_BAD_PSM; - l2cap_state_change(chan, BT_DISCONN); - - 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); - } - - l2cap_chan_del(chan, reason); - break; - - case BT_CONNECT: - case BT_DISCONN: - l2cap_chan_del(chan, reason); - break; - - default: - lock_sock(sk); - sock_set_flag(sk, SOCK_ZAPPED); - release_sock(sk); - break; - } -} - -static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) -{ - if (chan->chan_type == L2CAP_CHAN_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 */ -int l2cap_chan_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); -} - -static 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(&conn->lock); - - if (++conn->tx_ident > 128) - conn->tx_ident = 1; - - id = conn->tx_ident; - - spin_unlock(&conn->lock); - - return id; -} - -static 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; - - bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; - skb->priority = HCI_PRIO_MAX; - - hci_send_acl(conn->hchan, skb, flags); -} - -static 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 priority %u", chan, skb, skb->len, - skb->priority); - - if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && - lmp_no_flush_capable(hcon->hdev)) - flags = ACL_START_NO_FLUSH; - else - flags = ACL_START; - - bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); - hci_send_acl(chan->conn->hchan, skb, flags); -} - -static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control) -{ - struct sk_buff *skb; - struct l2cap_hdr *lh; - struct l2cap_conn *conn = chan->conn; - int count, hlen; - - if (chan->state != BT_CONNECTED) - return; - - if (test_bit(FLAG_EXT_CTRL, &chan->flags)) - hlen = L2CAP_EXT_HDR_SIZE; - else - hlen = L2CAP_ENH_HDR_SIZE; - - if (chan->fcs == L2CAP_FCS_CRC16) - hlen += L2CAP_FCS_SIZE; - - BT_DBG("chan %p, control 0x%8.8x", chan, control); - - count = min_t(unsigned int, conn->mtu, hlen); - - control |= __set_sframe(chan); - - if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) - control |= __set_ctrl_final(chan); - - if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) - control |= __set_ctrl_poll(chan); - - 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_control(chan, control, skb_put(skb, __ctrl_size(chan))); - - if (chan->fcs == L2CAP_FCS_CRC16) { - u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE); - put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); - } - - skb->priority = HCI_PRIO_MAX; - l2cap_do_send(chan, skb); -} - -static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) -{ - if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { - control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); - set_bit(CONN_RNR_SENT, &chan->conn_state); - } else - control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); - - control |= __set_reqseq(chan, chan->buffer_seq); - - l2cap_send_sframe(chan, control); -} - -static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) -{ - return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); -} - -static void l2cap_send_conn_req(struct l2cap_chan *chan) -{ - struct l2cap_conn *conn = chan->conn; - struct l2cap_conn_req req; - - req.scid = cpu_to_le16(chan->scid); - req.psm = chan->psm; - - chan->ident = l2cap_get_ident(conn); - - set_bit(CONF_CONNECT_PEND, &chan->conf_state); - - l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); -} - -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_chan_check_security(chan) && - __l2cap_no_conn_pending(chan)) - l2cap_send_conn_req(chan); - } 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); - - schedule_delayed_work(&conn->info_timer, 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; - } -} - -static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) -{ - struct sock *sk = chan->sk; - struct l2cap_disconn_req req; - - if (!conn) - return; - - if (chan->mode == L2CAP_MODE_ERTM) { - __clear_retrans_timer(chan); - __clear_monitor_timer(chan); - __clear_ack_timer(chan); - } - - 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); - - lock_sock(sk); - __l2cap_state_change(chan, BT_DISCONN); - __l2cap_chan_set_err(chan, err); - release_sock(sk); -} - -/* ---- L2CAP connections ---- */ -static void l2cap_conn_start(struct l2cap_conn *conn) -{ - struct l2cap_chan *chan, *tmp; - - BT_DBG("conn %p", conn); - - mutex_lock(&conn->chan_lock); - - list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { - struct sock *sk = chan->sk; - - l2cap_chan_lock(chan); - - if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { - l2cap_chan_unlock(chan); - continue; - } - - if (chan->state == BT_CONNECT) { - if (!l2cap_chan_check_security(chan) || - !__l2cap_no_conn_pending(chan)) { - l2cap_chan_unlock(chan); - continue; - } - - if (!l2cap_mode_supported(chan->mode, conn->feat_mask) - && test_bit(CONF_STATE2_DEVICE, - &chan->conf_state)) { - l2cap_chan_close(chan, ECONNRESET); - l2cap_chan_unlock(chan); - continue; - } - - l2cap_send_conn_req(chan); - - } else if (chan->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_chan_check_security(chan)) { - lock_sock(sk); - 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); - if (parent) - parent->sk_data_ready(parent, 0); - - } else { - __l2cap_state_change(chan, BT_CONFIG); - rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); - rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); - } - release_sock(sk); - } 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 (test_bit(CONF_REQ_SENT, &chan->conf_state) || - rsp.result != L2CAP_CR_SUCCESS) { - l2cap_chan_unlock(chan); - continue; - } - - set_bit(CONF_REQ_SENT, &chan->conf_state); - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(chan, buf), buf); - chan->num_conf_req++; - } - - l2cap_chan_unlock(chan); - } - - mutex_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 && c->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; - - lock_sock(parent); - - /* Check for backlog size */ - if (sk_acceptq_is_full(parent)) { - BT_DBG("backlog full %d", parent->sk_ack_backlog); - goto clean; - } - - chan = pchan->ops->new_connection(pchan->data); - if (!chan) - goto clean; - - sk = chan->sk; - - hci_conn_hold(conn->hcon); - - bacpy(&bt_sk(sk)->src, conn->src); - bacpy(&bt_sk(sk)->dst, conn->dst); - - bt_accept_enqueue(parent, sk); - - l2cap_chan_add(conn, chan); - - __set_chan_timer(chan, sk->sk_sndtimeo); - - __l2cap_state_change(chan, BT_CONNECTED); - parent->sk_data_ready(parent, 0); - -clean: - release_sock(parent); -} - -static void l2cap_chan_ready(struct l2cap_chan *chan) -{ - struct sock *sk = chan->sk; - struct sock *parent; - - lock_sock(sk); - - parent = bt_sk(sk)->parent; - - BT_DBG("sk %p, parent %p", sk, parent); - - chan->conf_state = 0; - __clear_chan_timer(chan); - - __l2cap_state_change(chan, BT_CONNECTED); - sk->sk_state_change(sk); - - if (parent) - parent->sk_data_ready(parent, 0); - - release_sock(sk); -} - -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); - - if (conn->hcon->out && conn->hcon->type == LE_LINK) - smp_conn_security(conn, conn->hcon->pending_sec_level); - - mutex_lock(&conn->chan_lock); - - list_for_each_entry(chan, &conn->chan_l, list) { - - l2cap_chan_lock(chan); - - if (conn->hcon->type == LE_LINK) { - if (smp_conn_security(conn, chan->sec_level)) - l2cap_chan_ready(chan); - - } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { - struct sock *sk = chan->sk; - __clear_chan_timer(chan); - lock_sock(sk); - __l2cap_state_change(chan, BT_CONNECTED); - sk->sk_state_change(sk); - release_sock(sk); - - } else if (chan->state == BT_CONNECT) - l2cap_do_start(chan); - - l2cap_chan_unlock(chan); - } - - mutex_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); - - mutex_lock(&conn->chan_lock); - - list_for_each_entry(chan, &conn->chan_l, list) { - if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) - __l2cap_chan_set_err(chan, err); - } - - mutex_unlock(&conn->chan_lock); -} - -static void l2cap_info_timeout(struct work_struct *work) -{ - struct l2cap_conn *conn = container_of(work, struct l2cap_conn, - info_timer.work); - - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); -} - -static void l2cap_conn_del(struct hci_conn *hcon, int err) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - struct l2cap_chan *chan, *l; - - if (!conn) - return; - - BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); - - kfree_skb(conn->rx_skb); - - mutex_lock(&conn->chan_lock); - - /* Kill channels */ - list_for_each_entry_safe(chan, l, &conn->chan_l, list) { - l2cap_chan_lock(chan); - - l2cap_chan_del(chan, err); - - l2cap_chan_unlock(chan); - - chan->ops->close(chan->data); - } - - mutex_unlock(&conn->chan_lock); - - hci_chan_del(conn->hchan); - - if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) - cancel_delayed_work_sync(&conn->info_timer); - - if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { - cancel_delayed_work_sync(&conn->security_timer); - smp_chan_destroy(conn); - } - - hcon->l2cap_data = NULL; - kfree(conn); -} - -static void security_timeout(struct work_struct *work) -{ - struct l2cap_conn *conn = container_of(work, struct l2cap_conn, - security_timer.work); - - l2cap_conn_del(conn->hcon, ETIMEDOUT); -} - -static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - struct hci_chan *hchan; - - if (conn || status) - return conn; - - hchan = hci_chan_create(hcon); - if (!hchan) - return NULL; - - conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); - if (!conn) { - hci_chan_del(hchan); - return NULL; - } - - hcon->l2cap_data = conn; - conn->hcon = hcon; - conn->hchan = hchan; - - BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); - - 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); - mutex_init(&conn->chan_lock); - - INIT_LIST_HEAD(&conn->chan_l); - - if (hcon->type == LE_LINK) - INIT_DELAYED_WORK(&conn->security_timer, security_timeout); - else - INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); - - conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; - - return conn; -} - -/* ---- 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 && c->state != state) - continue; - - if (c->psm == psm) { - /* 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; -} - -int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, bdaddr_t *dst) -{ - struct sock *sk = chan->sk; - bdaddr_t *src = &bt_sk(sk)->src; - 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(hdev); - - l2cap_chan_lock(chan); - - /* PSM must be odd and lsb of upper byte must be 0 */ - if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && - chan->chan_type != L2CAP_CHAN_RAW) { - err = -EINVAL; - goto done; - } - - if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { - err = -EINVAL; - goto done; - } - - switch (chan->mode) { - case L2CAP_MODE_BASIC: - break; - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - if (!disable_ertm) - break; - /* fall through */ - default: - err = -ENOTSUPP; - goto done; - } - - lock_sock(sk); - - switch (sk->sk_state) { - case BT_CONNECT: - case BT_CONNECT2: - case BT_CONFIG: - /* Already connecting */ - err = 0; - release_sock(sk); - goto done; - - case BT_CONNECTED: - /* Already connected */ - err = -EISCONN; - release_sock(sk); - goto done; - - case BT_OPEN: - case BT_BOUND: - /* Can connect */ - break; - - default: - err = -EBADFD; - release_sock(sk); - goto done; - } - - /* Set destination address and psm */ - bacpy(&bt_sk(sk)->dst, dst); - - release_sock(sk); - - chan->psm = psm; - chan->dcid = cid; - - 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_unlock(chan); - l2cap_chan_add(conn, chan); - l2cap_chan_lock(chan); - - l2cap_state_change(chan, BT_CONNECT); - __set_chan_timer(chan, sk->sk_sndtimeo); - - if (hcon->state == BT_CONNECTED) { - if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { - __clear_chan_timer(chan); - if (l2cap_chan_check_security(chan)) - l2cap_state_change(chan, BT_CONNECTED); - } else - l2cap_do_start(chan); - } - - err = 0; - -done: - l2cap_chan_unlock(chan); - hci_dev_unlock(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); - set_current_state(TASK_INTERRUPTIBLE); - while (chan->unacked_frames > 0 && chan->conn) { - 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); - set_current_state(TASK_INTERRUPTIBLE); - - 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(struct work_struct *work) -{ - struct l2cap_chan *chan = container_of(work, struct l2cap_chan, - monitor_timer.work); - - BT_DBG("chan %p", chan); - - l2cap_chan_lock(chan); - - if (chan->retry_count >= chan->remote_max_tx) { - l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); - l2cap_chan_unlock(chan); - l2cap_chan_put(chan); - return; - } - - chan->retry_count++; - __set_monitor_timer(chan); - - l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); - l2cap_chan_unlock(chan); - l2cap_chan_put(chan); -} - -static void l2cap_retrans_timeout(struct work_struct *work) -{ - struct l2cap_chan *chan = container_of(work, struct l2cap_chan, - retrans_timer.work); - - BT_DBG("chan %p", chan); - - l2cap_chan_lock(chan); - - chan->retry_count = 1; - __set_monitor_timer(chan); - - set_bit(CONN_WAIT_F, &chan->conn_state); - - l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); - - l2cap_chan_unlock(chan); - l2cap_chan_put(chan); -} - -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) - __clear_retrans_timer(chan); -} - -static void l2cap_streaming_send(struct l2cap_chan *chan) -{ - struct sk_buff *skb; - u32 control; - u16 fcs; - - while ((skb = skb_dequeue(&chan->tx_q))) { - control = __get_control(chan, skb->data + L2CAP_HDR_SIZE); - control |= __set_txseq(chan, chan->next_tx_seq); - __put_control(chan, control, skb->data + L2CAP_HDR_SIZE); - - if (chan->fcs == L2CAP_FCS_CRC16) { - fcs = crc16(0, (u8 *)skb->data, - skb->len - L2CAP_FCS_SIZE); - put_unaligned_le16(fcs, - skb->data + skb->len - L2CAP_FCS_SIZE); - } - - l2cap_do_send(chan, skb); - - chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); - } -} - -static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) -{ - struct sk_buff *skb, *tx_skb; - u16 fcs; - u32 control; - - skb = skb_peek(&chan->tx_q); - if (!skb) - return; - - while (bt_cb(skb)->tx_seq != tx_seq) { - if (skb_queue_is_last(&chan->tx_q, skb)) - return; - - 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_control(chan, tx_skb->data + L2CAP_HDR_SIZE); - control &= __get_sar_mask(chan); - - if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) - control |= __set_ctrl_final(chan); - - control |= __set_reqseq(chan, chan->buffer_seq); - control |= __set_txseq(chan, tx_seq); - - __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); - - if (chan->fcs == L2CAP_FCS_CRC16) { - fcs = crc16(0, (u8 *)tx_skb->data, - tx_skb->len - L2CAP_FCS_SIZE); - put_unaligned_le16(fcs, - tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE); - } - - l2cap_do_send(chan, tx_skb); -} - -static int l2cap_ertm_send(struct l2cap_chan *chan) -{ - struct sk_buff *skb, *tx_skb; - u16 fcs; - u32 control; - int nsent = 0; - - if (chan->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_control(chan, tx_skb->data + L2CAP_HDR_SIZE); - control &= __get_sar_mask(chan); - - if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) - control |= __set_ctrl_final(chan); - - control |= __set_reqseq(chan, chan->buffer_seq); - control |= __set_txseq(chan, chan->next_tx_seq); - - __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); - - if (chan->fcs == L2CAP_FCS_CRC16) { - fcs = crc16(0, (u8 *)skb->data, - tx_skb->len - L2CAP_FCS_SIZE); - put_unaligned_le16(fcs, skb->data + - tx_skb->len - L2CAP_FCS_SIZE); - } - - l2cap_do_send(chan, tx_skb); - - __set_retrans_timer(chan); - - bt_cb(skb)->tx_seq = chan->next_tx_seq; - - chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); - - if (bt_cb(skb)->retries == 1) { - chan->unacked_frames++; - - if (!nsent++) - __clear_ack_timer(chan); - } - - 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); - } - - 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) -{ - u32 control = 0; - - control |= __set_reqseq(chan, chan->buffer_seq); - - if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { - control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); - set_bit(CONN_RNR_SENT, &chan->conn_state); - l2cap_send_sframe(chan, control); - return; - } - - if (l2cap_ertm_send(chan) > 0) - return; - - control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); - l2cap_send_sframe(chan, control); -} - -static void l2cap_send_ack(struct l2cap_chan *chan) -{ - __clear_ack_timer(chan); - __l2cap_send_ack(chan); -} - -static void l2cap_send_srejtail(struct l2cap_chan *chan) -{ - struct srej_list *tail; - u32 control; - - control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); - control |= __set_ctrl_final(chan); - - tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); - control |= __set_reqseq(chan, tail->tx_seq); - - l2cap_send_sframe(chan, control); -} - -static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, - struct msghdr *msg, int len, - int count, struct sk_buff *skb) -{ - struct l2cap_conn *conn = 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 = chan->ops->alloc_skb(chan, count, - msg->msg_flags & MSG_DONTWAIT, - &err); - - if (!*frag) - return err; - if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) - return -EFAULT; - - (*frag)->priority = skb->priority; - - sent += count; - len -= count; - - frag = &(*frag)->next; - } - - return sent; -} - -static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, - struct msghdr *msg, size_t len, - u32 priority) -{ - struct l2cap_conn *conn = chan->conn; - struct sk_buff *skb; - int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; - struct l2cap_hdr *lh; - - BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); - - count = min_t(unsigned int, (conn->mtu - hlen), len); - - skb = chan->ops->alloc_skb(chan, count + hlen, - msg->msg_flags & MSG_DONTWAIT, &err); - - if (!skb) - return ERR_PTR(err); - - skb->priority = priority; - - /* 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(chan, msg, len, count, skb); - if (unlikely(err < 0)) { - kfree_skb(skb); - return ERR_PTR(err); - } - return skb; -} - -static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, - struct msghdr *msg, size_t len, - u32 priority) -{ - struct l2cap_conn *conn = chan->conn; - struct sk_buff *skb; - int err, count, hlen = L2CAP_HDR_SIZE; - struct l2cap_hdr *lh; - - BT_DBG("chan %p len %d", chan, (int)len); - - count = min_t(unsigned int, (conn->mtu - hlen), len); - - skb = chan->ops->alloc_skb(chan, count + hlen, - msg->msg_flags & MSG_DONTWAIT, &err); - - if (!skb) - return ERR_PTR(err); - - skb->priority = priority; - - /* 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(chan, msg, len, count, skb); - if (unlikely(err < 0)) { - kfree_skb(skb); - return ERR_PTR(err); - } - return skb; -} - -static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, - struct msghdr *msg, size_t len, - u32 control, u16 sdulen) -{ - struct l2cap_conn *conn = chan->conn; - struct sk_buff *skb; - int err, count, hlen; - struct l2cap_hdr *lh; - - BT_DBG("chan %p len %d", chan, (int)len); - - if (!conn) - return ERR_PTR(-ENOTCONN); - - if (test_bit(FLAG_EXT_CTRL, &chan->flags)) - hlen = L2CAP_EXT_HDR_SIZE; - else - hlen = L2CAP_ENH_HDR_SIZE; - - if (sdulen) - hlen += L2CAP_SDULEN_SIZE; - - if (chan->fcs == L2CAP_FCS_CRC16) - hlen += L2CAP_FCS_SIZE; - - count = min_t(unsigned int, (conn->mtu - hlen), len); - - skb = chan->ops->alloc_skb(chan, 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_control(chan, control, skb_put(skb, __ctrl_size(chan))); - - if (sdulen) - put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); - - err = l2cap_skbuff_fromiovec(chan, 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, L2CAP_FCS_SIZE)); - - bt_cb(skb)->retries = 0; - return skb; -} - -static 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; - u32 control; - size_t size = 0; - - skb_queue_head_init(&sar_queue); - control = __set_ctrl_sar(chan, L2CAP_SAR_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 = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE); - buflen = chan->remote_mps; - } else { - control = __set_ctrl_sar(chan, L2CAP_SAR_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; -} - -int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, - u32 priority) -{ - struct sk_buff *skb; - u32 control; - int err; - - /* Connectionless channel */ - if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { - skb = l2cap_create_connless_pdu(chan, msg, len, priority); - if (IS_ERR(skb)) - return PTR_ERR(skb); - - l2cap_do_send(chan, skb); - return len; - } - - switch (chan->mode) { - case L2CAP_MODE_BASIC: - /* Check outgoing MTU */ - if (len > chan->omtu) - return -EMSGSIZE; - - /* Create a basic PDU */ - skb = l2cap_create_basic_pdu(chan, msg, len, priority); - if (IS_ERR(skb)) - return PTR_ERR(skb); - - l2cap_do_send(chan, skb); - err = len; - break; - - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - /* Entire SDU fits into one PDU */ - if (len <= chan->remote_mps) { - control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED); - skb = l2cap_create_iframe_pdu(chan, msg, len, control, - 0); - if (IS_ERR(skb)) - return PTR_ERR(skb); - - __skb_queue_tail(&chan->tx_q, skb); - - if (chan->tx_send_head == NULL) - chan->tx_send_head = skb; - - } else { - /* Segment SDU into multiples PDUs */ - err = l2cap_sar_segment_sdu(chan, msg, len); - if (err < 0) - return err; - } - - if (chan->mode == L2CAP_MODE_STREAMING) { - l2cap_streaming_send(chan); - err = len; - break; - } - - if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && - test_bit(CONN_WAIT_F, &chan->conn_state)) { - err = len; - break; - } - - err = l2cap_ertm_send(chan); - if (err >= 0) - err = len; - - break; - - default: - BT_DBG("bad state %1.1x", chan->mode); - err = -EBADFD; - } - - return err; -} - -/* 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); - - mutex_lock(&conn->chan_lock); - - list_for_each_entry(chan, &conn->chan_l, list) { - struct sock *sk = chan->sk; - if (chan->chan_type != L2CAP_CHAN_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 (chan->ops->recv(chan->data, nskb)) - kfree_skb(nskb); - } - - mutex_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_add_opt_efs(void **ptr, struct l2cap_chan *chan) -{ - struct l2cap_conf_efs efs; - - switch (chan->mode) { - case L2CAP_MODE_ERTM: - efs.id = chan->local_id; - efs.stype = chan->local_stype; - efs.msdu = cpu_to_le16(chan->local_msdu); - efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); - efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); - efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); - break; - - case L2CAP_MODE_STREAMING: - efs.id = 1; - efs.stype = L2CAP_SERV_BESTEFFORT; - efs.msdu = cpu_to_le16(chan->local_msdu); - efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); - efs.acc_lat = 0; - efs.flush_to = 0; - break; - - default: - return; - } - - l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), - (unsigned long) &efs); -} - -static void l2cap_ack_timeout(struct work_struct *work) -{ - struct l2cap_chan *chan = container_of(work, struct l2cap_chan, - ack_timer.work); - - BT_DBG("chan %p", chan); - - l2cap_chan_lock(chan); - - __l2cap_send_ack(chan); - - l2cap_chan_unlock(chan); - - l2cap_chan_put(chan); -} - -static inline void l2cap_ertm_init(struct l2cap_chan *chan) -{ - chan->expected_ack_seq = 0; - chan->unacked_frames = 0; - chan->buffer_seq = 0; - chan->num_acked = 0; - chan->frames_sent = 0; - - INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); - INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); - INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); - - skb_queue_head_init(&chan->srej_q); - - INIT_LIST_HEAD(&chan->srej_l); -} - -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 inline bool __l2cap_ews_supported(struct l2cap_chan *chan) -{ - return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; -} - -static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) -{ - return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; -} - -static inline void l2cap_txwin_setup(struct l2cap_chan *chan) -{ - if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && - __l2cap_ews_supported(chan)) { - /* use extended control field */ - set_bit(FLAG_EXT_CTRL, &chan->flags); - chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; - } else { - chan->tx_win = min_t(u16, chan->tx_win, - L2CAP_DEFAULT_TX_WINDOW); - chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; - } -} - -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; - u16 size; - - 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 (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) - break; - - if (__l2cap_efs_supported(chan)) - set_bit(FLAG_EFS_ENABLE, &chan->flags); - - /* 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.max_transmit = chan->max_tx; - rfc.retrans_timeout = 0; - rfc.monitor_timeout = 0; - - size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - - L2CAP_EXT_HDR_SIZE - - L2CAP_SDULEN_SIZE - - L2CAP_FCS_SIZE); - rfc.max_pdu_size = cpu_to_le16(size); - - l2cap_txwin_setup(chan); - - rfc.txwin_size = min_t(u16, chan->tx_win, - L2CAP_DEFAULT_TX_WINDOW); - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), - (unsigned long) &rfc); - - if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) - l2cap_add_opt_efs(&ptr, chan); - - if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) - break; - - if (chan->fcs == L2CAP_FCS_NONE || - test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { - chan->fcs = L2CAP_FCS_NONE; - l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); - } - - if (test_bit(FLAG_EXT_CTRL, &chan->flags)) - l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, - chan->tx_win); - 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; - - size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - - L2CAP_EXT_HDR_SIZE - - L2CAP_SDULEN_SIZE - - L2CAP_FCS_SIZE); - rfc.max_pdu_size = cpu_to_le16(size); - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), - (unsigned long) &rfc); - - if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) - l2cap_add_opt_efs(&ptr, chan); - - if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) - break; - - if (chan->fcs == L2CAP_FCS_NONE || - test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { - 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 }; - struct l2cap_conf_efs efs; - u8 remote_efs = 0; - u16 mtu = L2CAP_DEFAULT_MTU; - u16 result = L2CAP_CONF_SUCCESS; - u16 size; - - 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) - set_bit(CONF_NO_FCS_RECV, &chan->conf_state); - break; - - case L2CAP_CONF_EFS: - remote_efs = 1; - if (olen == sizeof(efs)) - memcpy(&efs, (void *) val, olen); - break; - - case L2CAP_CONF_EWS: - if (!enable_hs) - return -ECONNREFUSED; - - set_bit(FLAG_EXT_CTRL, &chan->flags); - set_bit(CONF_EWS_RECV, &chan->conf_state); - chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; - chan->remote_tx_win = val; - 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 (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { - chan->mode = l2cap_select_mode(rfc.mode, - chan->conn->feat_mask); - break; - } - - if (remote_efs) { - if (__l2cap_efs_supported(chan)) - set_bit(FLAG_EFS_ENABLE, &chan->flags); - else - return -ECONNREFUSED; - } - - 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; - set_bit(CONF_MTU_DONE, &chan->conf_state); - } - l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); - - if (remote_efs) { - if (chan->local_stype != L2CAP_SERV_NOTRAFIC && - efs.stype != L2CAP_SERV_NOTRAFIC && - efs.stype != chan->local_stype) { - - result = L2CAP_CONF_UNACCEPT; - - if (chan->num_conf_req >= 1) - return -ECONNREFUSED; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, - sizeof(efs), - (unsigned long) &efs); - } else { - /* Send PENDING Conf Rsp */ - result = L2CAP_CONF_PENDING; - set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); - } - } - - switch (rfc.mode) { - case L2CAP_MODE_BASIC: - chan->fcs = L2CAP_FCS_NONE; - set_bit(CONF_MODE_DONE, &chan->conf_state); - break; - - case L2CAP_MODE_ERTM: - if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) - chan->remote_tx_win = rfc.txwin_size; - else - rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; - - chan->remote_max_tx = rfc.max_transmit; - - size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), - chan->conn->mtu - - L2CAP_EXT_HDR_SIZE - - L2CAP_SDULEN_SIZE - - L2CAP_FCS_SIZE); - rfc.max_pdu_size = cpu_to_le16(size); - chan->remote_mps = size; - - rfc.retrans_timeout = - le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); - rfc.monitor_timeout = - le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); - - set_bit(CONF_MODE_DONE, &chan->conf_state); - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - - if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { - chan->remote_id = efs.id; - chan->remote_stype = efs.stype; - chan->remote_msdu = le16_to_cpu(efs.msdu); - chan->remote_flush_to = - le32_to_cpu(efs.flush_to); - chan->remote_acc_lat = - le32_to_cpu(efs.acc_lat); - chan->remote_sdu_itime = - le32_to_cpu(efs.sdu_itime); - l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, - sizeof(efs), (unsigned long) &efs); - } - break; - - case L2CAP_MODE_STREAMING: - size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), - chan->conn->mtu - - L2CAP_EXT_HDR_SIZE - - L2CAP_SDULEN_SIZE - - L2CAP_FCS_SIZE); - rfc.max_pdu_size = cpu_to_le16(size); - chan->remote_mps = size; - - set_bit(CONF_MODE_DONE, &chan->conf_state); - - 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) - set_bit(CONF_OUTPUT_DONE, &chan->conf_state); - } - 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 = { .mode = L2CAP_MODE_BASIC }; - struct l2cap_conf_efs efs; - - 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 (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && - rfc.mode != chan->mode) - return -ECONNREFUSED; - - chan->fcs = 0; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - break; - - case L2CAP_CONF_EWS: - chan->tx_win = min_t(u16, val, - L2CAP_DEFAULT_EXT_WINDOW); - l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, - chan->tx_win); - break; - - case L2CAP_CONF_EFS: - if (olen == sizeof(efs)) - memcpy(&efs, (void *)val, olen); - - if (chan->local_stype != L2CAP_SERV_NOTRAFIC && - efs.stype != L2CAP_SERV_NOTRAFIC && - efs.stype != chan->local_stype) - return -ECONNREFUSED; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, - sizeof(efs), (unsigned long) &efs); - break; - } - } - - if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) - return -ECONNREFUSED; - - chan->mode = rfc.mode; - - if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { - 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); - - if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { - chan->local_msdu = le16_to_cpu(efs.msdu); - chan->local_sdu_itime = - le32_to_cpu(efs.sdu_itime); - chan->local_acc_lat = le32_to_cpu(efs.acc_lat); - chan->local_flush_to = - le32_to_cpu(efs.flush_to); - } - 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 (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) - return; - - 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; - } - } - - /* Use sane default values in case a misbehaving remote device - * did not send an RFC option. - */ - rfc.mode = chan->mode; - rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); - rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); - rfc.max_pdu_size = cpu_to_le16(chan->imtu); - - BT_ERR("Expected RFC option was not found, using defaults"); - -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_unk *rej = (struct l2cap_cmd_rej_unk *) data; - - if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) - return 0; - - if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && - cmd->ident == conn->info_ident) { - cancel_delayed_work(&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; - - mutex_lock(&conn->chan_lock); - 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 = HCI_ERROR_AUTH_FAILURE; - 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; - } - - chan = pchan->ops->new_connection(pchan->data); - if (!chan) - goto response; - - sk = chan->sk; - - /* Check if we already have channel with that dcid */ - if (__l2cap_get_chan_by_dcid(conn, scid)) { - sock_set_flag(sk, SOCK_ZAPPED); - chan->ops->close(chan->data); - goto response; - } - - hci_conn_hold(conn->hcon); - - 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; - - __set_chan_timer(chan, sk->sk_sndtimeo); - - chan->ident = cmd->ident; - - if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { - if (l2cap_chan_check_security(chan)) { - if (bt_sk(sk)->defer_setup) { - __l2cap_state_change(chan, BT_CONNECT2); - result = L2CAP_CR_PEND; - status = L2CAP_CS_AUTHOR_PEND; - parent->sk_data_ready(parent, 0); - } else { - __l2cap_state_change(chan, BT_CONFIG); - result = L2CAP_CR_SUCCESS; - status = L2CAP_CS_NO_INFO; - } - } else { - __l2cap_state_change(chan, BT_CONNECT2); - result = L2CAP_CR_PEND; - status = L2CAP_CS_AUTHEN_PEND; - } - } else { - __l2cap_state_change(chan, BT_CONNECT2); - result = L2CAP_CR_PEND; - status = L2CAP_CS_NO_INFO; - } - -response: - release_sock(parent); - mutex_unlock(&conn->chan_lock); - -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); - - schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); - - l2cap_send_cmd(conn, conn->info_ident, - L2CAP_INFO_REQ, sizeof(info), &info); - } - - if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && - result == L2CAP_CR_SUCCESS) { - u8 buf[128]; - set_bit(CONF_REQ_SENT, &chan->conf_state); - 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; - u8 req[128]; - int err; - - 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); - - mutex_lock(&conn->chan_lock); - - if (scid) { - chan = __l2cap_get_chan_by_scid(conn, scid); - if (!chan) { - err = -EFAULT; - goto unlock; - } - } else { - chan = __l2cap_get_chan_by_ident(conn, cmd->ident); - if (!chan) { - err = -EFAULT; - goto unlock; - } - } - - err = 0; - - l2cap_chan_lock(chan); - - switch (result) { - case L2CAP_CR_SUCCESS: - l2cap_state_change(chan, BT_CONFIG); - chan->ident = 0; - chan->dcid = dcid; - clear_bit(CONF_CONNECT_PEND, &chan->conf_state); - - if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) - break; - - 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: - set_bit(CONF_CONNECT_PEND, &chan->conf_state); - break; - - default: - l2cap_chan_del(chan, ECONNREFUSED); - break; - } - - l2cap_chan_unlock(chan); - -unlock: - mutex_unlock(&conn->chan_lock); - - return err; -} - -static inline void set_default_fcs(struct l2cap_chan *chan) -{ - /* 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 (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) - 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; - 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; - - if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { - struct l2cap_cmd_rej_cid rej; - - rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); - rej.scid = cpu_to_le16(chan->scid); - rej.dcid = cpu_to_le16(chan->dcid); - - 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 (len < 0 || 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 (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) - goto unlock; - - if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { - set_default_fcs(chan); - - l2cap_state_change(chan, 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(chan); - goto unlock; - } - - if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { - u8 buf[64]; - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(chan, buf), buf); - chan->num_conf_req++; - } - - /* Got Conf Rsp PENDING from remote side and asume we sent - Conf Rsp PENDING in the code above */ - if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && - test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { - - /* check compatibility */ - - clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); - set_bit(CONF_OUTPUT_DONE, &chan->conf_state); - - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, - l2cap_build_conf_rsp(chan, rsp, - L2CAP_CONF_SUCCESS, 0x0000), rsp); - } - -unlock: - l2cap_chan_unlock(chan); - 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; - 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; - - switch (result) { - case L2CAP_CONF_SUCCESS: - l2cap_conf_rfc_get(chan, rsp->data, len); - clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); - break; - - case L2CAP_CONF_PENDING: - set_bit(CONF_REM_CONF_PEND, &chan->conf_state); - - if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { - char buf[64]; - - len = l2cap_parse_conf_rsp(chan, rsp->data, len, - buf, &result); - if (len < 0) { - l2cap_send_disconn_req(conn, chan, ECONNRESET); - goto done; - } - - /* check compatibility */ - - clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); - set_bit(CONF_OUTPUT_DONE, &chan->conf_state); - - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, - l2cap_build_conf_rsp(chan, buf, - L2CAP_CONF_SUCCESS, 0x0000), buf); - } - goto done; - - 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: - l2cap_chan_set_err(chan, ECONNRESET); - - __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); - l2cap_send_disconn_req(conn, chan, ECONNRESET); - goto done; - } - - if (flags & 0x01) - goto done; - - set_bit(CONF_INPUT_DONE, &chan->conf_state); - - if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { - set_default_fcs(chan); - - l2cap_state_change(chan, 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(chan); - } - -done: - l2cap_chan_unlock(chan); - 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); - - mutex_lock(&conn->chan_lock); - - chan = __l2cap_get_chan_by_scid(conn, dcid); - if (!chan) { - mutex_unlock(&conn->chan_lock); - return 0; - } - - l2cap_chan_lock(chan); - - 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); - - lock_sock(sk); - sk->sk_shutdown = SHUTDOWN_MASK; - release_sock(sk); - - l2cap_chan_del(chan, ECONNRESET); - - l2cap_chan_unlock(chan); - - chan->ops->close(chan->data); - - mutex_unlock(&conn->chan_lock); - - 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; - - scid = __le16_to_cpu(rsp->scid); - dcid = __le16_to_cpu(rsp->dcid); - - BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); - - mutex_lock(&conn->chan_lock); - - chan = __l2cap_get_chan_by_scid(conn, scid); - if (!chan) { - mutex_unlock(&conn->chan_lock); - return 0; - } - - l2cap_chan_lock(chan); - - l2cap_chan_del(chan, 0); - - l2cap_chan_unlock(chan); - - chan->ops->close(chan->data); - - mutex_unlock(&conn->chan_lock); - - 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; - if (enable_hs) - feat_mask |= L2CAP_FEAT_EXT_FLOW - | L2CAP_FEAT_EXT_WINDOW; - - 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; - - if (enable_hs) - l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; - else - l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; - - rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); - rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); - memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); - 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; - - cancel_delayed_work(&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; - } - - switch (type) { - case 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); - } - break; - - case L2CAP_IT_FIXED_CHAN: - conn->fixed_chan_mask = rsp->data[0]; - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); - break; - } - - return 0; -} - -static inline int l2cap_create_channel_req(struct l2cap_conn *conn, - struct l2cap_cmd_hdr *cmd, u16 cmd_len, - void *data) -{ - struct l2cap_create_chan_req *req = data; - struct l2cap_create_chan_rsp rsp; - u16 psm, scid; - - if (cmd_len != sizeof(*req)) - return -EPROTO; - - if (!enable_hs) - return -EINVAL; - - psm = le16_to_cpu(req->psm); - scid = le16_to_cpu(req->scid); - - BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); - - /* Placeholder: Always reject */ - rsp.dcid = 0; - rsp.scid = cpu_to_le16(scid); - rsp.result = L2CAP_CR_NO_MEM; - rsp.status = L2CAP_CS_NO_INFO; - - l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, - sizeof(rsp), &rsp); - - return 0; -} - -static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, - struct l2cap_cmd_hdr *cmd, void *data) -{ - BT_DBG("conn %p", conn); - - return l2cap_connect_rsp(conn, cmd, data); -} - -static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, - u16 icid, u16 result) -{ - struct l2cap_move_chan_rsp rsp; - - BT_DBG("icid %d, result %d", icid, result); - - rsp.icid = cpu_to_le16(icid); - rsp.result = cpu_to_le16(result); - - l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); -} - -static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, - struct l2cap_chan *chan, u16 icid, u16 result) -{ - struct l2cap_move_chan_cfm cfm; - u8 ident; - - BT_DBG("icid %d, result %d", icid, result); - - ident = l2cap_get_ident(conn); - if (chan) - chan->ident = ident; - - cfm.icid = cpu_to_le16(icid); - cfm.result = cpu_to_le16(result); - - l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); -} - -static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, - u16 icid) -{ - struct l2cap_move_chan_cfm_rsp rsp; - - BT_DBG("icid %d", icid); - - rsp.icid = cpu_to_le16(icid); - l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); -} - -static inline int l2cap_move_channel_req(struct l2cap_conn *conn, - struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) -{ - struct l2cap_move_chan_req *req = data; - u16 icid = 0; - u16 result = L2CAP_MR_NOT_ALLOWED; - - if (cmd_len != sizeof(*req)) - return -EPROTO; - - icid = le16_to_cpu(req->icid); - - BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); - - if (!enable_hs) - return -EINVAL; - - /* Placeholder: Always refuse */ - l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); - - return 0; -} - -static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, - struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) -{ - struct l2cap_move_chan_rsp *rsp = data; - u16 icid, result; - - if (cmd_len != sizeof(*rsp)) - return -EPROTO; - - icid = le16_to_cpu(rsp->icid); - result = le16_to_cpu(rsp->result); - - BT_DBG("icid %d, result %d", icid, result); - - /* Placeholder: Always unconfirmed */ - l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); - - return 0; -} - -static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, - struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) -{ - struct l2cap_move_chan_cfm *cfm = data; - u16 icid, result; - - if (cmd_len != sizeof(*cfm)) - return -EPROTO; - - icid = le16_to_cpu(cfm->icid); - result = le16_to_cpu(cfm->result); - - BT_DBG("icid %d, result %d", icid, result); - - l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); - - return 0; -} - -static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, - struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) -{ - struct l2cap_move_chan_cfm_rsp *rsp = data; - u16 icid; - - if (cmd_len != sizeof(*rsp)) - return -EPROTO; - - icid = le16_to_cpu(rsp->icid); - - BT_DBG("icid %d", icid); - - 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; - - case L2CAP_CREATE_CHAN_REQ: - err = l2cap_create_channel_req(conn, cmd, cmd_len, data); - break; - - case L2CAP_CREATE_CHAN_RSP: - err = l2cap_create_channel_rsp(conn, cmd, data); - break; - - case L2CAP_MOVE_CHAN_REQ: - err = l2cap_move_channel_req(conn, cmd, cmd_len, data); - break; - - case L2CAP_MOVE_CHAN_RSP: - err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); - break; - - case L2CAP_MOVE_CHAN_CFM: - err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); - break; - - case L2CAP_MOVE_CHAN_CFM_RSP: - err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, 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_unk rej; - - BT_ERR("Wrong link type (%d)", err); - - /* FIXME: Map err to a valid reason */ - rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); - 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; - - if (test_bit(FLAG_EXT_CTRL, &chan->flags)) - hdr_size = L2CAP_EXT_HDR_SIZE; - else - hdr_size = L2CAP_ENH_HDR_SIZE; - - if (chan->fcs == L2CAP_FCS_CRC16) { - skb_trim(skb, skb->len - L2CAP_FCS_SIZE); - 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) -{ - u32 control = 0; - - chan->frames_sent = 0; - - control |= __set_reqseq(chan, chan->buffer_seq); - - if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { - control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); - l2cap_send_sframe(chan, control); - set_bit(CONN_RNR_SENT, &chan->conn_state); - } - - if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) - l2cap_retransmit_frames(chan); - - l2cap_ertm_send(chan); - - if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && - chan->frames_sent == 0) { - control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); - l2cap_send_sframe(chan, control); - } -} - -static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 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); - - tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); - - while (next_skb) { - if (bt_cb(next_skb)->tx_seq == tx_seq) - return -EINVAL; - - next_tx_seq_offset = __seq_offset(chan, - bt_cb(next_skb)->tx_seq, chan->buffer_seq); - - 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)) - next_skb = NULL; - else - next_skb = skb_queue_next(&chan->srej_q, next_skb); - } - - __skb_queue_tail(&chan->srej_q, skb); - - return 0; -} - -static void append_skb_frag(struct sk_buff *skb, - struct sk_buff *new_frag, struct sk_buff **last_frag) -{ - /* skb->len reflects data in skb as well as all fragments - * skb->data_len reflects only data in fragments - */ - if (!skb_has_frag_list(skb)) - skb_shinfo(skb)->frag_list = new_frag; - - new_frag->next = NULL; - - (*last_frag)->next = new_frag; - *last_frag = new_frag; - - skb->len += new_frag->len; - skb->data_len += new_frag->len; - skb->truesize += new_frag->truesize; -} - -static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control) -{ - int err = -EINVAL; - - switch (__get_ctrl_sar(chan, control)) { - case L2CAP_SAR_UNSEGMENTED: - if (chan->sdu) - break; - - err = chan->ops->recv(chan->data, skb); - break; - - case L2CAP_SAR_START: - if (chan->sdu) - break; - - chan->sdu_len = get_unaligned_le16(skb->data); - skb_pull(skb, L2CAP_SDULEN_SIZE); - - if (chan->sdu_len > chan->imtu) { - err = -EMSGSIZE; - break; - } - - if (skb->len >= chan->sdu_len) - break; - - chan->sdu = skb; - chan->sdu_last_frag = skb; - - skb = NULL; - err = 0; - break; - - case L2CAP_SAR_CONTINUE: - if (!chan->sdu) - break; - - append_skb_frag(chan->sdu, skb, - &chan->sdu_last_frag); - skb = NULL; - - if (chan->sdu->len >= chan->sdu_len) - break; - - err = 0; - break; - - case L2CAP_SAR_END: - if (!chan->sdu) - break; - - append_skb_frag(chan->sdu, skb, - &chan->sdu_last_frag); - skb = NULL; - - if (chan->sdu->len != chan->sdu_len) - break; - - err = chan->ops->recv(chan->data, chan->sdu); - - if (!err) { - /* Reassembly complete */ - chan->sdu = NULL; - chan->sdu_last_frag = NULL; - chan->sdu_len = 0; - } - break; - } - - if (err) { - kfree_skb(skb); - kfree_skb(chan->sdu); - chan->sdu = NULL; - chan->sdu_last_frag = NULL; - chan->sdu_len = 0; - } - - return err; -} - -static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) -{ - BT_DBG("chan %p, Enter local busy", chan); - - set_bit(CONN_LOCAL_BUSY, &chan->conn_state); - - __set_ack_timer(chan); -} - -static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) -{ - u32 control; - - if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) - goto done; - - control = __set_reqseq(chan, chan->buffer_seq); - control |= __set_ctrl_poll(chan); - control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); - l2cap_send_sframe(chan, control); - chan->retry_count = 1; - - __clear_retrans_timer(chan); - __set_monitor_timer(chan); - - set_bit(CONN_WAIT_F, &chan->conn_state); - -done: - clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); - clear_bit(CONN_RNR_SENT, &chan->conn_state); - - BT_DBG("chan %p, Exit local busy", chan); -} - -void l2cap_chan_busy(struct l2cap_chan *chan, int busy) -{ - if (chan->mode == L2CAP_MODE_ERTM) { - if (busy) - l2cap_ertm_enter_local_busy(chan); - else - l2cap_ertm_exit_local_busy(chan); - } -} - -static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) -{ - struct sk_buff *skb; - u32 control; - - while ((skb = skb_peek(&chan->srej_q)) && - !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { - int err; - - if (bt_cb(skb)->tx_seq != tx_seq) - break; - - skb = skb_dequeue(&chan->srej_q); - control = __set_ctrl_sar(chan, bt_cb(skb)->sar); - err = l2cap_reassemble_sdu(chan, skb, control); - - if (err < 0) { - l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); - break; - } - - chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej); - tx_seq = __next_seq(chan, tx_seq); - } -} - -static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) -{ - struct srej_list *l, *tmp; - u32 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 = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); - control |= __set_reqseq(chan, l->tx_seq); - l2cap_send_sframe(chan, control); - list_del(&l->list); - list_add_tail(&l->list, &chan->srej_l); - } -} - -static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) -{ - struct srej_list *new; - u32 control; - - while (tx_seq != chan->expected_tx_seq) { - control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); - control |= __set_reqseq(chan, chan->expected_tx_seq); - l2cap_send_sframe(chan, control); - - new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); - if (!new) - return -ENOMEM; - - new->tx_seq = chan->expected_tx_seq; - - chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); - - list_add_tail(&new->list, &chan->srej_l); - } - - chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); - - return 0; -} - -static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) -{ - u16 tx_seq = __get_txseq(chan, rx_control); - u16 req_seq = __get_reqseq(chan, rx_control); - u8 sar = __get_ctrl_sar(chan, rx_control); - 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%8.8x", chan, skb->len, - tx_seq, rx_control); - - if (__is_ctrl_final(chan, rx_control) && - test_bit(CONN_WAIT_F, &chan->conn_state)) { - __clear_monitor_timer(chan); - if (chan->unacked_frames > 0) - __set_retrans_timer(chan); - clear_bit(CONN_WAIT_F, &chan->conn_state); - } - - chan->expected_ack_seq = req_seq; - l2cap_drop_acked_frames(chan); - - tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); - - /* invalid tx_seq */ - if (tx_seq_offset >= chan->tx_win) { - l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); - goto drop; - } - - if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { - if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) - l2cap_send_ack(chan); - goto drop; - } - - if (tx_seq == chan->expected_tx_seq) - goto expected; - - if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { - 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; - clear_bit(CONN_SREJ_SENT, &chan->conn_state); - 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; - } - } - - err = l2cap_send_srejframe(chan, tx_seq); - if (err < 0) { - l2cap_send_disconn_req(chan->conn, chan, -err); - return err; - } - } - } else { - expected_tx_seq_offset = __seq_offset(chan, - chan->expected_tx_seq, chan->buffer_seq); - - /* duplicated tx_seq */ - if (tx_seq_offset < expected_tx_seq_offset) - goto drop; - - set_bit(CONN_SREJ_SENT, &chan->conn_state); - - 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); - l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); - - /* Set P-bit only if there are some I-frames to ack. */ - if (__clear_ack_timer(chan)) - set_bit(CONN_SEND_PBIT, &chan->conn_state); - - err = l2cap_send_srejframe(chan, tx_seq); - if (err < 0) { - l2cap_send_disconn_req(chan->conn, chan, -err); - return err; - } - } - return 0; - -expected: - chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); - - if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { - bt_cb(skb)->tx_seq = tx_seq; - bt_cb(skb)->sar = sar; - __skb_queue_tail(&chan->srej_q, skb); - return 0; - } - - err = l2cap_reassemble_sdu(chan, skb, rx_control); - chan->buffer_seq = __next_seq(chan, chan->buffer_seq); - - if (err < 0) { - l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); - return err; - } - - if (__is_ctrl_final(chan, rx_control)) { - if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) - l2cap_retransmit_frames(chan); - } - - - chan->num_acked = (chan->num_acked + 1) % num_to_ack; - if (chan->num_acked == num_to_ack - 1) - l2cap_send_ack(chan); - else - __set_ack_timer(chan); - - return 0; - -drop: - kfree_skb(skb); - return 0; -} - -static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control) -{ - BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, - __get_reqseq(chan, rx_control), rx_control); - - chan->expected_ack_seq = __get_reqseq(chan, rx_control); - l2cap_drop_acked_frames(chan); - - if (__is_ctrl_poll(chan, rx_control)) { - set_bit(CONN_SEND_FBIT, &chan->conn_state); - if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { - if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && - (chan->unacked_frames > 0)) - __set_retrans_timer(chan); - - clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); - l2cap_send_srejtail(chan); - } else { - l2cap_send_i_or_rr_or_rnr(chan); - } - - } else if (__is_ctrl_final(chan, rx_control)) { - clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); - - if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) - l2cap_retransmit_frames(chan); - - } else { - if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && - (chan->unacked_frames > 0)) - __set_retrans_timer(chan); - - clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); - if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) - l2cap_send_ack(chan); - else - l2cap_ertm_send(chan); - } -} - -static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control) -{ - u16 tx_seq = __get_reqseq(chan, rx_control); - - BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); - - clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); - - chan->expected_ack_seq = tx_seq; - l2cap_drop_acked_frames(chan); - - if (__is_ctrl_final(chan, rx_control)) { - if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) - l2cap_retransmit_frames(chan); - } else { - l2cap_retransmit_frames(chan); - - if (test_bit(CONN_WAIT_F, &chan->conn_state)) - set_bit(CONN_REJ_ACT, &chan->conn_state); - } -} -static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control) -{ - u16 tx_seq = __get_reqseq(chan, rx_control); - - BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); - - clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); - - if (__is_ctrl_poll(chan, rx_control)) { - chan->expected_ack_seq = tx_seq; - l2cap_drop_acked_frames(chan); - - set_bit(CONN_SEND_FBIT, &chan->conn_state); - l2cap_retransmit_one_frame(chan, tx_seq); - - l2cap_ertm_send(chan); - - if (test_bit(CONN_WAIT_F, &chan->conn_state)) { - chan->srej_save_reqseq = tx_seq; - set_bit(CONN_SREJ_ACT, &chan->conn_state); - } - } else if (__is_ctrl_final(chan, rx_control)) { - if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && - chan->srej_save_reqseq == tx_seq) - clear_bit(CONN_SREJ_ACT, &chan->conn_state); - else - l2cap_retransmit_one_frame(chan, tx_seq); - } else { - l2cap_retransmit_one_frame(chan, tx_seq); - if (test_bit(CONN_WAIT_F, &chan->conn_state)) { - chan->srej_save_reqseq = tx_seq; - set_bit(CONN_SREJ_ACT, &chan->conn_state); - } - } -} - -static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control) -{ - u16 tx_seq = __get_reqseq(chan, rx_control); - - BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); - - set_bit(CONN_REMOTE_BUSY, &chan->conn_state); - chan->expected_ack_seq = tx_seq; - l2cap_drop_acked_frames(chan); - - if (__is_ctrl_poll(chan, rx_control)) - set_bit(CONN_SEND_FBIT, &chan->conn_state); - - if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { - __clear_retrans_timer(chan); - if (__is_ctrl_poll(chan, rx_control)) - l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); - return; - } - - if (__is_ctrl_poll(chan, rx_control)) { - l2cap_send_srejtail(chan); - } else { - rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); - l2cap_send_sframe(chan, rx_control); - } -} - -static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) -{ - BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len); - - if (__is_ctrl_final(chan, rx_control) && - test_bit(CONN_WAIT_F, &chan->conn_state)) { - __clear_monitor_timer(chan); - if (chan->unacked_frames > 0) - __set_retrans_timer(chan); - clear_bit(CONN_WAIT_F, &chan->conn_state); - } - - switch (__get_ctrl_super(chan, rx_control)) { - case L2CAP_SUPER_RR: - l2cap_data_channel_rrframe(chan, rx_control); - break; - - case L2CAP_SUPER_REJ: - l2cap_data_channel_rejframe(chan, rx_control); - break; - - case L2CAP_SUPER_SREJ: - l2cap_data_channel_srejframe(chan, rx_control); - break; - - case L2CAP_SUPER_RNR: - l2cap_data_channel_rnrframe(chan, rx_control); - break; - } - - kfree_skb(skb); - return 0; -} - -static int l2cap_ertm_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) -{ - u32 control; - u16 req_seq; - int len, next_tx_seq_offset, req_seq_offset; - - control = __get_control(chan, skb->data); - skb_pull(skb, __ctrl_size(chan)); - 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(chan, control) && !__is_sframe(chan, control)) - len -= L2CAP_SDULEN_SIZE; - - if (chan->fcs == L2CAP_FCS_CRC16) - len -= L2CAP_FCS_SIZE; - - if (len > chan->mps) { - l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); - goto drop; - } - - req_seq = __get_reqseq(chan, control); - - req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq); - - next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq, - chan->expected_ack_seq); - - /* 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_sframe(chan, 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; - u32 control; - u16 tx_seq; - int len; - - chan = l2cap_get_chan_by_scid(conn, cid); - if (!chan) { - BT_DBG("unknown cid 0x%4.4x", cid); - /* Drop packet and return */ - kfree_skb(skb); - return 0; - } - - BT_DBG("chan %p, len %d", chan, skb->len); - - if (chan->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 (!chan->ops->recv(chan->data, skb)) - goto done; - break; - - case L2CAP_MODE_ERTM: - l2cap_ertm_data_rcv(chan, skb); - - goto done; - - case L2CAP_MODE_STREAMING: - control = __get_control(chan, skb->data); - skb_pull(skb, __ctrl_size(chan)); - len = skb->len; - - if (l2cap_check_fcs(chan, skb)) - goto drop; - - if (__is_sar_start(chan, control)) - len -= L2CAP_SDULEN_SIZE; - - if (chan->fcs == L2CAP_FCS_CRC16) - len -= L2CAP_FCS_SIZE; - - if (len > chan->mps || len < 0 || __is_sframe(chan, control)) - goto drop; - - tx_seq = __get_txseq(chan, control); - - if (chan->expected_tx_seq != tx_seq) { - /* Frame(s) missing - must discard partial SDU */ - kfree_skb(chan->sdu); - chan->sdu = NULL; - chan->sdu_last_frag = NULL; - chan->sdu_len = 0; - - /* TODO: Notify userland of missing data */ - } - - chan->expected_tx_seq = __next_seq(chan, tx_seq); - - if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) - l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); - - goto done; - - default: - BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); - break; - } - -drop: - kfree_skb(skb); - -done: - l2cap_chan_unlock(chan); - - return 0; -} - -static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) -{ - struct l2cap_chan *chan; - - chan = l2cap_global_chan_by_psm(0, psm, conn->src); - if (!chan) - goto drop; - - BT_DBG("chan %p, len %d", chan, skb->len); - - if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) - goto drop; - - if (chan->imtu < skb->len) - goto drop; - - if (!chan->ops->recv(chan->data, skb)) - return 0; - -drop: - kfree_skb(skb); - - return 0; -} - -static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) -{ - struct l2cap_chan *chan; - - chan = l2cap_global_chan_by_scid(0, cid, conn->src); - if (!chan) - goto drop; - - BT_DBG("chan %p, len %d", chan, skb->len); - - if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) - goto drop; - - if (chan->imtu < skb->len) - goto drop; - - if (!chan->ops->recv(chan->data, skb)) - return 0; - -drop: - kfree_skb(skb); - - 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; - - case L2CAP_CID_SMP: - if (smp_sig_channel(conn, skb)) - l2cap_conn_del(conn->hcon, EACCES); - break; - - default: - l2cap_data_channel(conn, cid, skb); - break; - } -} - -/* ---- L2CAP interface with lower layer (HCI) ---- */ - -int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) -{ - int exact = 0, lm1 = 0, lm2 = 0; - struct l2cap_chan *c; - - 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 (c->state != BT_LISTEN) - continue; - - if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { - lm1 |= HCI_LM_ACCEPT; - if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) - lm1 |= HCI_LM_MASTER; - exact++; - } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { - lm2 |= HCI_LM_ACCEPT; - if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) - lm2 |= HCI_LM_MASTER; - } - } - read_unlock(&chan_list_lock); - - return exact ? lm1 : lm2; -} - -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 (!status) { - conn = l2cap_conn_add(hcon, status); - if (conn) - l2cap_conn_ready(conn); - } else - l2cap_conn_del(hcon, bt_to_errno(status)); - - return 0; -} - -int l2cap_disconn_ind(struct hci_conn *hcon) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - - BT_DBG("hcon %p", hcon); - - if (!conn) - return HCI_ERROR_REMOTE_USER_TERM; - return conn->disc_reason; -} - -int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) -{ - BT_DBG("hcon %p reason %d", hcon, reason); - - l2cap_conn_del(hcon, bt_to_errno(reason)); - return 0; -} - -static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) -{ - if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) - return; - - if (encrypt == 0x00) { - if (chan->sec_level == BT_SECURITY_MEDIUM) { - __clear_chan_timer(chan); - __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); - } else if (chan->sec_level == BT_SECURITY_HIGH) - l2cap_chan_close(chan, ECONNREFUSED); - } else { - if (chan->sec_level == BT_SECURITY_MEDIUM) - __clear_chan_timer(chan); - } -} - -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); - - if (hcon->type == LE_LINK) { - smp_distribute_keys(conn, 0); - cancel_delayed_work(&conn->security_timer); - } - - mutex_lock(&conn->chan_lock); - - list_for_each_entry(chan, &conn->chan_l, list) { - l2cap_chan_lock(chan); - - BT_DBG("chan->scid %d", chan->scid); - - if (chan->scid == L2CAP_CID_LE_DATA) { - if (!status && encrypt) { - chan->sec_level = hcon->sec_level; - l2cap_chan_ready(chan); - } - - l2cap_chan_unlock(chan); - continue; - } - - if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { - l2cap_chan_unlock(chan); - continue; - } - - if (!status && (chan->state == BT_CONNECTED || - chan->state == BT_CONFIG)) { - struct sock *sk = chan->sk; - - bt_sk(sk)->suspended = false; - sk->sk_state_change(sk); - - l2cap_check_encryption(chan, encrypt); - l2cap_chan_unlock(chan); - continue; - } - - if (chan->state == BT_CONNECT) { - if (!status) { - l2cap_send_conn_req(chan); - } else { - __clear_chan_timer(chan); - __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); - } - } else if (chan->state == BT_CONNECT2) { - struct sock *sk = chan->sk; - struct l2cap_conn_rsp rsp; - __u16 res, stat; - - lock_sock(sk); - - if (!status) { - if (bt_sk(sk)->defer_setup) { - struct sock *parent = bt_sk(sk)->parent; - res = L2CAP_CR_PEND; - stat = L2CAP_CS_AUTHOR_PEND; - if (parent) - parent->sk_data_ready(parent, 0); - } else { - __l2cap_state_change(chan, BT_CONFIG); - res = L2CAP_CR_SUCCESS; - stat = L2CAP_CS_NO_INFO; - } - } else { - __l2cap_state_change(chan, BT_DISCONN); - __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); - res = L2CAP_CR_SEC_BLOCK; - stat = L2CAP_CS_NO_INFO; - } - - release_sock(sk); - - rsp.scid = cpu_to_le16(chan->dcid); - rsp.dcid = cpu_to_le16(chan->scid); - rsp.result = cpu_to_le16(res); - rsp.status = cpu_to_le16(stat); - l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, - sizeof(rsp), &rsp); - } - - l2cap_chan_unlock(chan); - } - - mutex_unlock(&conn->chan_lock); - - return 0; -} - -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; - 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; - - 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; - } - - /* 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(&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), - c->state, __le16_to_cpu(c->psm), - c->scid, c->dcid, c->imtu, c->omtu, - c->sec_level, c->mode); - } - - read_unlock(&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; - -int __init l2cap_init(void) -{ - int err; - - err = l2cap_init_sockets(); - if (err < 0) - return err; - - 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; -} - -void l2cap_exit(void) -{ - debugfs_remove(l2cap_debugfs); - l2cap_cleanup_sockets(); -} - -module_param(disable_ertm, bool, 0644); -MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |