In a preparation to the the L2CAP code split in many files.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
obj-$(CONFIG_BT_HIDP) += hidp/
bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o hci_sock.o hci_sysfs.o lib.o
+l2cap-y := l2cap_core.o
+++ /dev/null
-/*
- BlueZ - Bluetooth protocol stack for Linux
- Copyright (C) 2000-2001 Qualcomm Incorporated
- Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
- Copyright (C) 2010 Google Inc.
-
- Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License version 2 as
- published by the Free Software Foundation;
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
- IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
- CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
- ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
- COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
- SOFTWARE IS DISCLAIMED.
-*/
-
-/* Bluetooth L2CAP core and sockets. */
-
-#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>
-
-#define VERSION "2.15"
-
-static int disable_ertm;
-
-static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
-static u8 l2cap_fixed_chan[8] = { 0x02, };
-
-static const struct proto_ops l2cap_sock_ops;
-
-static struct workqueue_struct *_busy_wq;
-
-static struct bt_sock_list l2cap_sk_list = {
- .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
-};
-
-static void l2cap_busy_work(struct work_struct *work);
-
-static void __l2cap_sock_close(struct sock *sk, int reason);
-static void l2cap_sock_close(struct sock *sk);
-static void l2cap_sock_kill(struct sock *sk);
-
-static int l2cap_build_conf_req(struct sock *sk, void *data);
-static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
- u8 code, u8 ident, u16 dlen, void *data);
-
-static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
-
-/* ---- L2CAP timers ---- */
-static void l2cap_sock_set_timer(struct sock *sk, long timeout)
-{
- BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
- sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
-}
-
-static void l2cap_sock_clear_timer(struct sock *sk)
-{
- BT_DBG("sock %p state %d", sk, sk->sk_state);
- sk_stop_timer(sk, &sk->sk_timer);
-}
-
-static void l2cap_sock_timeout(unsigned long arg)
-{
- struct sock *sk = (struct sock *) arg;
- int reason;
-
- BT_DBG("sock %p state %d", sk, sk->sk_state);
-
- bh_lock_sock(sk);
-
- if (sock_owned_by_user(sk)) {
- /* sk is owned by user. Try again later */
- l2cap_sock_set_timer(sk, HZ / 5);
- bh_unlock_sock(sk);
- sock_put(sk);
- return;
- }
-
- if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
- reason = ECONNREFUSED;
- else if (sk->sk_state == BT_CONNECT &&
- l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
- reason = ECONNREFUSED;
- else
- reason = ETIMEDOUT;
-
- __l2cap_sock_close(sk, reason);
-
- bh_unlock_sock(sk);
-
- l2cap_sock_kill(sk);
- sock_put(sk);
-}
-
-/* ---- L2CAP channels ---- */
-static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
-{
- struct sock *s;
- for (s = l->head; s; s = l2cap_pi(s)->next_c) {
- if (l2cap_pi(s)->dcid == cid)
- break;
- }
- return s;
-}
-
-static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
-{
- struct sock *s;
- for (s = l->head; s; s = l2cap_pi(s)->next_c) {
- if (l2cap_pi(s)->scid == cid)
- break;
- }
- return s;
-}
-
-/* Find channel with given SCID.
- * Returns locked socket */
-static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
-{
- struct sock *s;
- read_lock(&l->lock);
- s = __l2cap_get_chan_by_scid(l, cid);
- if (s)
- bh_lock_sock(s);
- read_unlock(&l->lock);
- return s;
-}
-
-static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
-{
- struct sock *s;
- for (s = l->head; s; s = l2cap_pi(s)->next_c) {
- if (l2cap_pi(s)->ident == ident)
- break;
- }
- return s;
-}
-
-static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
-{
- struct sock *s;
- read_lock(&l->lock);
- s = __l2cap_get_chan_by_ident(l, ident);
- if (s)
- bh_lock_sock(s);
- read_unlock(&l->lock);
- return s;
-}
-
-static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
-{
- u16 cid = L2CAP_CID_DYN_START;
-
- for (; cid < L2CAP_CID_DYN_END; cid++) {
- if (!__l2cap_get_chan_by_scid(l, cid))
- return cid;
- }
-
- return 0;
-}
-
-static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
-{
- sock_hold(sk);
-
- if (l->head)
- l2cap_pi(l->head)->prev_c = sk;
-
- l2cap_pi(sk)->next_c = l->head;
- l2cap_pi(sk)->prev_c = NULL;
- l->head = sk;
-}
-
-static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
-{
- struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
-
- write_lock_bh(&l->lock);
- if (sk == l->head)
- l->head = next;
-
- if (next)
- l2cap_pi(next)->prev_c = prev;
- if (prev)
- l2cap_pi(prev)->next_c = next;
- write_unlock_bh(&l->lock);
-
- __sock_put(sk);
-}
-
-static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
-{
- struct l2cap_chan_list *l = &conn->chan_list;
-
- BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
- l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
-
- conn->disc_reason = 0x13;
-
- l2cap_pi(sk)->conn = conn;
-
- if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) {
- /* Alloc CID for connection-oriented socket */
- l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
- } else if (sk->sk_type == SOCK_DGRAM) {
- /* Connectionless socket */
- l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
- l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
- l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
- } else {
- /* Raw socket can send/recv signalling messages only */
- l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
- l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
- l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
- }
-
- __l2cap_chan_link(l, sk);
-
- if (parent)
- bt_accept_enqueue(parent, sk);
-}
-
-/* Delete channel.
- * Must be called on the locked socket. */
-static void l2cap_chan_del(struct sock *sk, int err)
-{
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- struct sock *parent = bt_sk(sk)->parent;
-
- l2cap_sock_clear_timer(sk);
-
- BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
-
- if (conn) {
- /* Unlink from channel list */
- l2cap_chan_unlink(&conn->chan_list, sk);
- l2cap_pi(sk)->conn = NULL;
- hci_conn_put(conn->hcon);
- }
-
- sk->sk_state = BT_CLOSED;
- sock_set_flag(sk, SOCK_ZAPPED);
-
- if (err)
- sk->sk_err = err;
-
- if (parent) {
- bt_accept_unlink(sk);
- parent->sk_data_ready(parent, 0);
- } else
- sk->sk_state_change(sk);
-
- skb_queue_purge(TX_QUEUE(sk));
-
- if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
- struct srej_list *l, *tmp;
-
- del_timer(&l2cap_pi(sk)->retrans_timer);
- del_timer(&l2cap_pi(sk)->monitor_timer);
- del_timer(&l2cap_pi(sk)->ack_timer);
-
- skb_queue_purge(SREJ_QUEUE(sk));
- skb_queue_purge(BUSY_QUEUE(sk));
-
- list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
- list_del(&l->list);
- kfree(l);
- }
- }
-}
-
-static inline u8 l2cap_get_auth_type(struct sock *sk)
-{
- if (sk->sk_type == SOCK_RAW) {
- switch (l2cap_pi(sk)->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 (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
- if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
- l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
-
- if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
- return HCI_AT_NO_BONDING_MITM;
- else
- return HCI_AT_NO_BONDING;
- } else {
- switch (l2cap_pi(sk)->sec_level) {
- case BT_SECURITY_HIGH:
- return HCI_AT_GENERAL_BONDING_MITM;
- case BT_SECURITY_MEDIUM:
- return HCI_AT_GENERAL_BONDING;
- default:
- return HCI_AT_NO_BONDING;
- }
- }
-}
-
-/* Service level security */
-static inline int l2cap_check_security(struct sock *sk)
-{
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- __u8 auth_type;
-
- auth_type = l2cap_get_auth_type(sk);
-
- return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
- auth_type);
-}
-
-static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
-{
- u8 id;
-
- /* Get next available identificator.
- * 1 - 128 are used by kernel.
- * 129 - 199 are reserved.
- * 200 - 254 are used by utilities like l2ping, etc.
- */
-
- spin_lock_bh(&conn->lock);
-
- if (++conn->tx_ident > 128)
- conn->tx_ident = 1;
-
- id = conn->tx_ident;
-
- spin_unlock_bh(&conn->lock);
-
- return id;
-}
-
-static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
-{
- struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
- u8 flags;
-
- BT_DBG("code 0x%2.2x", code);
-
- if (!skb)
- return;
-
- if (lmp_no_flush_capable(conn->hcon->hdev))
- flags = ACL_START_NO_FLUSH;
- else
- flags = ACL_START;
-
- hci_send_acl(conn->hcon, skb, flags);
-}
-
-static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
-{
- struct sk_buff *skb;
- struct l2cap_hdr *lh;
- struct l2cap_conn *conn = pi->conn;
- struct sock *sk = (struct sock *)pi;
- int count, hlen = L2CAP_HDR_SIZE + 2;
- u8 flags;
-
- if (sk->sk_state != BT_CONNECTED)
- return;
-
- if (pi->fcs == L2CAP_FCS_CRC16)
- hlen += 2;
-
- BT_DBG("pi %p, control 0x%2.2x", pi, control);
-
- count = min_t(unsigned int, conn->mtu, hlen);
- control |= L2CAP_CTRL_FRAME_TYPE;
-
- if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
- control |= L2CAP_CTRL_FINAL;
- pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
- }
-
- if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
- control |= L2CAP_CTRL_POLL;
- pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
- }
-
- skb = bt_skb_alloc(count, GFP_ATOMIC);
- if (!skb)
- return;
-
- lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
- lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
- lh->cid = cpu_to_le16(pi->dcid);
- put_unaligned_le16(control, skb_put(skb, 2));
-
- if (pi->fcs == L2CAP_FCS_CRC16) {
- u16 fcs = crc16(0, (u8 *)lh, count - 2);
- put_unaligned_le16(fcs, skb_put(skb, 2));
- }
-
- if (lmp_no_flush_capable(conn->hcon->hdev))
- flags = ACL_START_NO_FLUSH;
- else
- flags = ACL_START;
-
- hci_send_acl(pi->conn->hcon, skb, flags);
-}
-
-static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
-{
- if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
- control |= L2CAP_SUPER_RCV_NOT_READY;
- pi->conn_state |= L2CAP_CONN_RNR_SENT;
- } else
- control |= L2CAP_SUPER_RCV_READY;
-
- control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
-
- l2cap_send_sframe(pi, control);
-}
-
-static inline int __l2cap_no_conn_pending(struct sock *sk)
-{
- return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND);
-}
-
-static void l2cap_do_start(struct sock *sk)
-{
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
-
- if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
- if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
- return;
-
- if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) {
- struct l2cap_conn_req req;
- req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
- req.psm = l2cap_pi(sk)->psm;
-
- l2cap_pi(sk)->ident = l2cap_get_ident(conn);
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
-
- l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
- L2CAP_CONN_REQ, sizeof(req), &req);
- }
- } else {
- struct l2cap_info_req req;
- req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
-
- conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
- conn->info_ident = l2cap_get_ident(conn);
-
- mod_timer(&conn->info_timer, jiffies +
- msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
-
- l2cap_send_cmd(conn, conn->info_ident,
- L2CAP_INFO_REQ, sizeof(req), &req);
- }
-}
-
-static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
-{
- u32 local_feat_mask = l2cap_feat_mask;
- if (!disable_ertm)
- local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
-
- switch (mode) {
- case L2CAP_MODE_ERTM:
- return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
- case L2CAP_MODE_STREAMING:
- return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
- default:
- return 0x00;
- }
-}
-
-static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err)
-{
- struct l2cap_disconn_req req;
-
- if (!conn)
- return;
-
- skb_queue_purge(TX_QUEUE(sk));
-
- if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
- del_timer(&l2cap_pi(sk)->retrans_timer);
- del_timer(&l2cap_pi(sk)->monitor_timer);
- del_timer(&l2cap_pi(sk)->ack_timer);
- }
-
- req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
- req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
- l2cap_send_cmd(conn, l2cap_get_ident(conn),
- L2CAP_DISCONN_REQ, sizeof(req), &req);
-
- sk->sk_state = BT_DISCONN;
- sk->sk_err = err;
-}
-
-/* ---- L2CAP connections ---- */
-static void l2cap_conn_start(struct l2cap_conn *conn)
-{
- struct l2cap_chan_list *l = &conn->chan_list;
- struct sock_del_list del, *tmp1, *tmp2;
- struct sock *sk;
-
- BT_DBG("conn %p", conn);
-
- INIT_LIST_HEAD(&del.list);
-
- read_lock(&l->lock);
-
- for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
- bh_lock_sock(sk);
-
- if (sk->sk_type != SOCK_SEQPACKET &&
- sk->sk_type != SOCK_STREAM) {
- bh_unlock_sock(sk);
- continue;
- }
-
- if (sk->sk_state == BT_CONNECT) {
- struct l2cap_conn_req req;
-
- if (!l2cap_check_security(sk) ||
- !__l2cap_no_conn_pending(sk)) {
- bh_unlock_sock(sk);
- continue;
- }
-
- if (!l2cap_mode_supported(l2cap_pi(sk)->mode,
- conn->feat_mask)
- && l2cap_pi(sk)->conf_state &
- L2CAP_CONF_STATE2_DEVICE) {
- tmp1 = kzalloc(sizeof(struct sock_del_list),
- GFP_ATOMIC);
- tmp1->sk = sk;
- list_add_tail(&tmp1->list, &del.list);
- bh_unlock_sock(sk);
- continue;
- }
-
- req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
- req.psm = l2cap_pi(sk)->psm;
-
- l2cap_pi(sk)->ident = l2cap_get_ident(conn);
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
-
- l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
- L2CAP_CONN_REQ, sizeof(req), &req);
-
- } else if (sk->sk_state == BT_CONNECT2) {
- struct l2cap_conn_rsp rsp;
- char buf[128];
- rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
- rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
-
- if (l2cap_check_security(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);
- parent->sk_data_ready(parent, 0);
-
- } else {
- sk->sk_state = BT_CONFIG;
- rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
- rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
- }
- } else {
- rsp.result = cpu_to_le16(L2CAP_CR_PEND);
- rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
- }
-
- l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
- L2CAP_CONN_RSP, sizeof(rsp), &rsp);
-
- if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT ||
- rsp.result != L2CAP_CR_SUCCESS) {
- bh_unlock_sock(sk);
- continue;
- }
-
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
- l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, buf), buf);
- l2cap_pi(sk)->num_conf_req++;
- }
-
- bh_unlock_sock(sk);
- }
-
- read_unlock(&l->lock);
-
- list_for_each_entry_safe(tmp1, tmp2, &del.list, list) {
- bh_lock_sock(tmp1->sk);
- __l2cap_sock_close(tmp1->sk, ECONNRESET);
- bh_unlock_sock(tmp1->sk);
- list_del(&tmp1->list);
- kfree(tmp1);
- }
-}
-
-static void l2cap_conn_ready(struct l2cap_conn *conn)
-{
- struct l2cap_chan_list *l = &conn->chan_list;
- struct sock *sk;
-
- BT_DBG("conn %p", conn);
-
- read_lock(&l->lock);
-
- for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
- bh_lock_sock(sk);
-
- if (sk->sk_type != SOCK_SEQPACKET &&
- sk->sk_type != SOCK_STREAM) {
- l2cap_sock_clear_timer(sk);
- sk->sk_state = BT_CONNECTED;
- sk->sk_state_change(sk);
- } else if (sk->sk_state == BT_CONNECT)
- l2cap_do_start(sk);
-
- bh_unlock_sock(sk);
- }
-
- read_unlock(&l->lock);
-}
-
-/* Notify sockets that we cannot guaranty reliability anymore */
-static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
-{
- struct l2cap_chan_list *l = &conn->chan_list;
- struct sock *sk;
-
- BT_DBG("conn %p", conn);
-
- read_lock(&l->lock);
-
- for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
- if (l2cap_pi(sk)->force_reliable)
- sk->sk_err = err;
- }
-
- read_unlock(&l->lock);
-}
-
-static void l2cap_info_timeout(unsigned long arg)
-{
- struct l2cap_conn *conn = (void *) arg;
-
- conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
- conn->info_ident = 0;
-
- l2cap_conn_start(conn);
-}
-
-static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
-{
- struct l2cap_conn *conn = hcon->l2cap_data;
-
- if (conn || status)
- return conn;
-
- conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
- if (!conn)
- return NULL;
-
- hcon->l2cap_data = conn;
- conn->hcon = hcon;
-
- BT_DBG("hcon %p conn %p", hcon, conn);
-
- conn->mtu = hcon->hdev->acl_mtu;
- conn->src = &hcon->hdev->bdaddr;
- conn->dst = &hcon->dst;
-
- conn->feat_mask = 0;
-
- spin_lock_init(&conn->lock);
- rwlock_init(&conn->chan_list.lock);
-
- setup_timer(&conn->info_timer, l2cap_info_timeout,
- (unsigned long) conn);
-
- conn->disc_reason = 0x13;
-
- return conn;
-}
-
-static void l2cap_conn_del(struct hci_conn *hcon, int err)
-{
- struct l2cap_conn *conn = hcon->l2cap_data;
- struct sock *sk;
-
- if (!conn)
- return;
-
- BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
-
- kfree_skb(conn->rx_skb);
-
- /* Kill channels */
- while ((sk = conn->chan_list.head)) {
- bh_lock_sock(sk);
- l2cap_chan_del(sk, err);
- bh_unlock_sock(sk);
- l2cap_sock_kill(sk);
- }
-
- if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
- del_timer_sync(&conn->info_timer);
-
- hcon->l2cap_data = NULL;
- kfree(conn);
-}
-
-static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
-{
- struct l2cap_chan_list *l = &conn->chan_list;
- write_lock_bh(&l->lock);
- __l2cap_chan_add(conn, sk, parent);
- write_unlock_bh(&l->lock);
-}
-
-/* ---- Socket interface ---- */
-static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
-{
- struct sock *sk;
- struct hlist_node *node;
- sk_for_each(sk, node, &l2cap_sk_list.head)
- if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
- goto found;
- sk = NULL;
-found:
- return sk;
-}
-
-/* Find socket with psm and source bdaddr.
- * Returns closest match.
- */
-static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
-{
- struct sock *sk = NULL, *sk1 = NULL;
- struct hlist_node *node;
-
- read_lock(&l2cap_sk_list.lock);
-
- sk_for_each(sk, node, &l2cap_sk_list.head) {
- if (state && sk->sk_state != state)
- continue;
-
- if (l2cap_pi(sk)->psm == psm) {
- /* Exact match. */
- if (!bacmp(&bt_sk(sk)->src, src))
- break;
-
- /* Closest match */
- if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
- sk1 = sk;
- }
- }
-
- read_unlock(&l2cap_sk_list.lock);
-
- return node ? sk : sk1;
-}
-
-static void l2cap_sock_destruct(struct sock *sk)
-{
- BT_DBG("sk %p", sk);
-
- skb_queue_purge(&sk->sk_receive_queue);
- skb_queue_purge(&sk->sk_write_queue);
-}
-
-static void l2cap_sock_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)))
- l2cap_sock_close(sk);
-
- parent->sk_state = BT_CLOSED;
- sock_set_flag(parent, SOCK_ZAPPED);
-}
-
-/* Kill socket (only if zapped and orphan)
- * Must be called on unlocked socket.
- */
-static void l2cap_sock_kill(struct sock *sk)
-{
- if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
- return;
-
- BT_DBG("sk %p state %d", sk, sk->sk_state);
-
- /* Kill poor orphan */
- bt_sock_unlink(&l2cap_sk_list, sk);
- sock_set_flag(sk, SOCK_DEAD);
- sock_put(sk);
-}
-
-static void __l2cap_sock_close(struct sock *sk, int reason)
-{
- BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
-
- switch (sk->sk_state) {
- case BT_LISTEN:
- l2cap_sock_cleanup_listen(sk);
- break;
-
- case BT_CONNECTED:
- case BT_CONFIG:
- if (sk->sk_type == SOCK_SEQPACKET ||
- sk->sk_type == SOCK_STREAM) {
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
-
- l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
- l2cap_send_disconn_req(conn, sk, reason);
- } else
- l2cap_chan_del(sk, reason);
- break;
-
- case BT_CONNECT2:
- if (sk->sk_type == SOCK_SEQPACKET ||
- sk->sk_type == SOCK_STREAM) {
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- struct l2cap_conn_rsp rsp;
- __u16 result;
-
- if (bt_sk(sk)->defer_setup)
- result = L2CAP_CR_SEC_BLOCK;
- else
- result = L2CAP_CR_BAD_PSM;
- sk->sk_state = BT_DISCONN;
-
- rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
- rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
- rsp.result = cpu_to_le16(result);
- rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
- l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
- L2CAP_CONN_RSP, sizeof(rsp), &rsp);
- } else
- l2cap_chan_del(sk, reason);
- break;
-
- case BT_CONNECT:
- case BT_DISCONN:
- l2cap_chan_del(sk, reason);
- break;
-
- default:
- sock_set_flag(sk, SOCK_ZAPPED);
- break;
- }
-}
-
-/* Must be called on unlocked socket. */
-static void l2cap_sock_close(struct sock *sk)
-{
- l2cap_sock_clear_timer(sk);
- lock_sock(sk);
- __l2cap_sock_close(sk, ECONNRESET);
- release_sock(sk);
- l2cap_sock_kill(sk);
-}
-
-static void l2cap_sock_init(struct sock *sk, struct sock *parent)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
-
- BT_DBG("sk %p", sk);
-
- if (parent) {
- sk->sk_type = parent->sk_type;
- bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
-
- pi->imtu = l2cap_pi(parent)->imtu;
- pi->omtu = l2cap_pi(parent)->omtu;
- pi->conf_state = l2cap_pi(parent)->conf_state;
- pi->mode = l2cap_pi(parent)->mode;
- pi->fcs = l2cap_pi(parent)->fcs;
- pi->max_tx = l2cap_pi(parent)->max_tx;
- pi->tx_win = l2cap_pi(parent)->tx_win;
- pi->sec_level = l2cap_pi(parent)->sec_level;
- pi->role_switch = l2cap_pi(parent)->role_switch;
- pi->force_reliable = l2cap_pi(parent)->force_reliable;
- pi->flushable = l2cap_pi(parent)->flushable;
- } else {
- pi->imtu = L2CAP_DEFAULT_MTU;
- pi->omtu = 0;
- if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
- pi->mode = L2CAP_MODE_ERTM;
- pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
- } else {
- pi->mode = L2CAP_MODE_BASIC;
- }
- pi->max_tx = L2CAP_DEFAULT_MAX_TX;
- pi->fcs = L2CAP_FCS_CRC16;
- pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
- pi->sec_level = BT_SECURITY_LOW;
- pi->role_switch = 0;
- pi->force_reliable = 0;
- pi->flushable = BT_FLUSHABLE_OFF;
- }
-
- /* Default config options */
- pi->conf_len = 0;
- pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
- skb_queue_head_init(TX_QUEUE(sk));
- skb_queue_head_init(SREJ_QUEUE(sk));
- skb_queue_head_init(BUSY_QUEUE(sk));
- INIT_LIST_HEAD(SREJ_LIST(sk));
-}
-
-static struct proto l2cap_proto = {
- .name = "L2CAP",
- .owner = THIS_MODULE,
- .obj_size = sizeof(struct l2cap_pinfo)
-};
-
-static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
-{
- struct sock *sk;
-
- sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
- if (!sk)
- return NULL;
-
- sock_init_data(sock, sk);
- INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
-
- sk->sk_destruct = l2cap_sock_destruct;
- sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
-
- sock_reset_flag(sk, SOCK_ZAPPED);
-
- sk->sk_protocol = proto;
- sk->sk_state = BT_OPEN;
-
- setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
-
- bt_sock_link(&l2cap_sk_list, sk);
- return sk;
-}
-
-static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
- int kern)
-{
- struct sock *sk;
-
- BT_DBG("sock %p", sock);
-
- sock->state = SS_UNCONNECTED;
-
- if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
- sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
- return -ESOCKTNOSUPPORT;
-
- if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
- return -EPERM;
-
- sock->ops = &l2cap_sock_ops;
-
- sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
- if (!sk)
- return -ENOMEM;
-
- l2cap_sock_init(sk, NULL);
- return 0;
-}
-
-static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
-{
- struct sock *sk = sock->sk;
- struct sockaddr_l2 la;
- int len, err = 0;
-
- BT_DBG("sk %p", sk);
-
- if (!addr || addr->sa_family != AF_BLUETOOTH)
- return -EINVAL;
-
- memset(&la, 0, sizeof(la));
- len = min_t(unsigned int, sizeof(la), alen);
- memcpy(&la, addr, len);
-
- if (la.l2_cid)
- return -EINVAL;
-
- lock_sock(sk);
-
- if (sk->sk_state != BT_OPEN) {
- err = -EBADFD;
- goto done;
- }
-
- if (la.l2_psm) {
- __u16 psm = __le16_to_cpu(la.l2_psm);
-
- /* PSM must be odd and lsb of upper byte must be 0 */
- if ((psm & 0x0101) != 0x0001) {
- err = -EINVAL;
- goto done;
- }
-
- /* Restrict usage of well-known PSMs */
- if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
- err = -EACCES;
- goto done;
- }
- }
-
- write_lock_bh(&l2cap_sk_list.lock);
-
- if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
- err = -EADDRINUSE;
- } else {
- /* Save source address */
- bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
- l2cap_pi(sk)->psm = la.l2_psm;
- l2cap_pi(sk)->sport = la.l2_psm;
- sk->sk_state = BT_BOUND;
-
- if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
- __le16_to_cpu(la.l2_psm) == 0x0003)
- l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
- }
-
- write_unlock_bh(&l2cap_sk_list.lock);
-
-done:
- release_sock(sk);
- return err;
-}
-
-static int l2cap_do_connect(struct sock *sk)
-{
- bdaddr_t *src = &bt_sk(sk)->src;
- bdaddr_t *dst = &bt_sk(sk)->dst;
- struct l2cap_conn *conn;
- struct hci_conn *hcon;
- struct hci_dev *hdev;
- __u8 auth_type;
- int err;
-
- BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
- l2cap_pi(sk)->psm);
-
- hdev = hci_get_route(dst, src);
- if (!hdev)
- return -EHOSTUNREACH;
-
- hci_dev_lock_bh(hdev);
-
- err = -ENOMEM;
-
- auth_type = l2cap_get_auth_type(sk);
-
- hcon = hci_connect(hdev, ACL_LINK, dst,
- l2cap_pi(sk)->sec_level, auth_type);
- if (!hcon)
- goto done;
-
- conn = l2cap_conn_add(hcon, 0);
- if (!conn) {
- hci_conn_put(hcon);
- goto done;
- }
-
- err = 0;
-
- /* Update source addr of the socket */
- bacpy(src, conn->src);
-
- l2cap_chan_add(conn, sk, NULL);
-
- sk->sk_state = BT_CONNECT;
- l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
-
- if (hcon->state == BT_CONNECTED) {
- if (sk->sk_type != SOCK_SEQPACKET &&
- sk->sk_type != SOCK_STREAM) {
- l2cap_sock_clear_timer(sk);
- if (l2cap_check_security(sk))
- sk->sk_state = BT_CONNECTED;
- } else
- l2cap_do_start(sk);
- }
-
-done:
- hci_dev_unlock_bh(hdev);
- hci_dev_put(hdev);
- return err;
-}
-
-static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
-{
- struct sock *sk = sock->sk;
- struct sockaddr_l2 la;
- int len, err = 0;
-
- BT_DBG("sk %p", sk);
-
- if (!addr || alen < sizeof(addr->sa_family) ||
- addr->sa_family != AF_BLUETOOTH)
- return -EINVAL;
-
- memset(&la, 0, sizeof(la));
- len = min_t(unsigned int, sizeof(la), alen);
- memcpy(&la, addr, len);
-
- if (la.l2_cid)
- return -EINVAL;
-
- lock_sock(sk);
-
- if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM)
- && !la.l2_psm) {
- err = -EINVAL;
- goto done;
- }
-
- switch (l2cap_pi(sk)->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;
- }
-
- switch (sk->sk_state) {
- case BT_CONNECT:
- case BT_CONNECT2:
- case BT_CONFIG:
- /* Already connecting */
- goto wait;
-
- case BT_CONNECTED:
- /* Already connected */
- err = -EISCONN;
- goto done;
-
- case BT_OPEN:
- case BT_BOUND:
- /* Can connect */
- break;
-
- default:
- err = -EBADFD;
- goto done;
- }
-
- /* PSM must be odd and lsb of upper byte must be 0 */
- if ((__le16_to_cpu(la.l2_psm) & 0x0101) != 0x0001 &&
- sk->sk_type != SOCK_RAW) {
- err = -EINVAL;
- goto done;
- }
-
- /* Set destination address and psm */
- bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
- l2cap_pi(sk)->psm = la.l2_psm;
-
- err = l2cap_do_connect(sk);
- if (err)
- goto done;
-
-wait:
- err = bt_sock_wait_state(sk, BT_CONNECTED,
- sock_sndtimeo(sk, flags & O_NONBLOCK));
-done:
- release_sock(sk);
- return err;
-}
-
-static int l2cap_sock_listen(struct socket *sock, int backlog)
-{
- struct sock *sk = sock->sk;
- int err = 0;
-
- BT_DBG("sk %p backlog %d", sk, backlog);
-
- lock_sock(sk);
-
- if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
- || sk->sk_state != BT_BOUND) {
- err = -EBADFD;
- goto done;
- }
-
- switch (l2cap_pi(sk)->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;
- }
-
- if (!l2cap_pi(sk)->psm) {
- bdaddr_t *src = &bt_sk(sk)->src;
- u16 psm;
-
- err = -EINVAL;
-
- write_lock_bh(&l2cap_sk_list.lock);
-
- for (psm = 0x1001; psm < 0x1100; psm += 2)
- if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
- l2cap_pi(sk)->psm = cpu_to_le16(psm);
- l2cap_pi(sk)->sport = cpu_to_le16(psm);
- err = 0;
- break;
- }
-
- write_unlock_bh(&l2cap_sk_list.lock);
-
- if (err < 0)
- goto done;
- }
-
- sk->sk_max_ack_backlog = backlog;
- sk->sk_ack_backlog = 0;
- sk->sk_state = BT_LISTEN;
-
-done:
- release_sock(sk);
- return err;
-}
-
-static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
-{
- DECLARE_WAITQUEUE(wait, current);
- struct sock *sk = sock->sk, *nsk;
- long timeo;
- int err = 0;
-
- lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
-
- if (sk->sk_state != BT_LISTEN) {
- err = -EBADFD;
- goto done;
- }
-
- timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
-
- BT_DBG("sk %p timeo %ld", sk, timeo);
-
- /* Wait for an incoming connection. (wake-one). */
- add_wait_queue_exclusive(sk_sleep(sk), &wait);
- while (!(nsk = bt_accept_dequeue(sk, newsock))) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (!timeo) {
- err = -EAGAIN;
- break;
- }
-
- release_sock(sk);
- timeo = schedule_timeout(timeo);
- lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
-
- if (sk->sk_state != BT_LISTEN) {
- err = -EBADFD;
- break;
- }
-
- if (signal_pending(current)) {
- err = sock_intr_errno(timeo);
- break;
- }
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(sk_sleep(sk), &wait);
-
- if (err)
- goto done;
-
- newsock->state = SS_CONNECTED;
-
- BT_DBG("new socket %p", nsk);
-
-done:
- release_sock(sk);
- return err;
-}
-
-static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
-{
- struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
- struct sock *sk = sock->sk;
-
- BT_DBG("sock %p, sk %p", sock, sk);
-
- addr->sa_family = AF_BLUETOOTH;
- *len = sizeof(struct sockaddr_l2);
-
- if (peer) {
- la->l2_psm = l2cap_pi(sk)->psm;
- bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
- la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
- } else {
- la->l2_psm = l2cap_pi(sk)->sport;
- bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
- la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
- }
-
- return 0;
-}
-
-static int __l2cap_wait_ack(struct sock *sk)
-{
- DECLARE_WAITQUEUE(wait, current);
- int err = 0;
- int timeo = HZ/5;
-
- add_wait_queue(sk_sleep(sk), &wait);
- while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) {
- set_current_state(TASK_INTERRUPTIBLE);
-
- if (!timeo)
- timeo = HZ/5;
-
- if (signal_pending(current)) {
- err = sock_intr_errno(timeo);
- break;
- }
-
- release_sock(sk);
- timeo = schedule_timeout(timeo);
- lock_sock(sk);
-
- err = sock_error(sk);
- if (err)
- break;
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(sk_sleep(sk), &wait);
- return err;
-}
-
-static void l2cap_monitor_timeout(unsigned long arg)
-{
- struct sock *sk = (void *) arg;
-
- BT_DBG("sk %p", sk);
-
- bh_lock_sock(sk);
- if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
- l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED);
- bh_unlock_sock(sk);
- return;
- }
-
- l2cap_pi(sk)->retry_count++;
- __mod_monitor_timer();
-
- l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
- bh_unlock_sock(sk);
-}
-
-static void l2cap_retrans_timeout(unsigned long arg)
-{
- struct sock *sk = (void *) arg;
-
- BT_DBG("sk %p", sk);
-
- bh_lock_sock(sk);
- l2cap_pi(sk)->retry_count = 1;
- __mod_monitor_timer();
-
- l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
-
- l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
- bh_unlock_sock(sk);
-}
-
-static void l2cap_drop_acked_frames(struct sock *sk)
-{
- struct sk_buff *skb;
-
- while ((skb = skb_peek(TX_QUEUE(sk))) &&
- l2cap_pi(sk)->unacked_frames) {
- if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
- break;
-
- skb = skb_dequeue(TX_QUEUE(sk));
- kfree_skb(skb);
-
- l2cap_pi(sk)->unacked_frames--;
- }
-
- if (!l2cap_pi(sk)->unacked_frames)
- del_timer(&l2cap_pi(sk)->retrans_timer);
-}
-
-static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct hci_conn *hcon = pi->conn->hcon;
- u16 flags;
-
- BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
-
- if (!pi->flushable && lmp_no_flush_capable(hcon->hdev))
- flags = ACL_START_NO_FLUSH;
- else
- flags = ACL_START;
-
- hci_send_acl(hcon, skb, flags);
-}
-
-static void l2cap_streaming_send(struct sock *sk)
-{
- struct sk_buff *skb;
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- u16 control, fcs;
-
- while ((skb = skb_dequeue(TX_QUEUE(sk)))) {
- control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
- control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
- put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
-
- if (pi->fcs == L2CAP_FCS_CRC16) {
- fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
- put_unaligned_le16(fcs, skb->data + skb->len - 2);
- }
-
- l2cap_do_send(sk, skb);
-
- pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
- }
-}
-
-static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct sk_buff *skb, *tx_skb;
- u16 control, fcs;
-
- skb = skb_peek(TX_QUEUE(sk));
- if (!skb)
- return;
-
- do {
- if (bt_cb(skb)->tx_seq == tx_seq)
- break;
-
- if (skb_queue_is_last(TX_QUEUE(sk), skb))
- return;
-
- } while ((skb = skb_queue_next(TX_QUEUE(sk), skb)));
-
- if (pi->remote_max_tx &&
- bt_cb(skb)->retries == pi->remote_max_tx) {
- l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
- return;
- }
-
- tx_skb = skb_clone(skb, GFP_ATOMIC);
- bt_cb(skb)->retries++;
- control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
-
- if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
- control |= L2CAP_CTRL_FINAL;
- pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
- }
-
- control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
- | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
-
- put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
-
- if (pi->fcs == L2CAP_FCS_CRC16) {
- fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
- put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
- }
-
- l2cap_do_send(sk, tx_skb);
-}
-
-static int l2cap_ertm_send(struct sock *sk)
-{
- struct sk_buff *skb, *tx_skb;
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- u16 control, fcs;
- int nsent = 0;
-
- if (sk->sk_state != BT_CONNECTED)
- return -ENOTCONN;
-
- while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) {
-
- if (pi->remote_max_tx &&
- bt_cb(skb)->retries == pi->remote_max_tx) {
- l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
- break;
- }
-
- tx_skb = skb_clone(skb, GFP_ATOMIC);
-
- bt_cb(skb)->retries++;
-
- control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
- control &= L2CAP_CTRL_SAR;
-
- if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
- control |= L2CAP_CTRL_FINAL;
- pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
- }
- control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
- | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
- put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
-
-
- if (pi->fcs == L2CAP_FCS_CRC16) {
- fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
- put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
- }
-
- l2cap_do_send(sk, tx_skb);
-
- __mod_retrans_timer();
-
- bt_cb(skb)->tx_seq = pi->next_tx_seq;
- pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
-
- pi->unacked_frames++;
- pi->frames_sent++;
-
- if (skb_queue_is_last(TX_QUEUE(sk), skb))
- sk->sk_send_head = NULL;
- else
- sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
-
- nsent++;
- }
-
- return nsent;
-}
-
-static int l2cap_retransmit_frames(struct sock *sk)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- int ret;
-
- if (!skb_queue_empty(TX_QUEUE(sk)))
- sk->sk_send_head = TX_QUEUE(sk)->next;
-
- pi->next_tx_seq = pi->expected_ack_seq;
- ret = l2cap_ertm_send(sk);
- return ret;
-}
-
-static void l2cap_send_ack(struct l2cap_pinfo *pi)
-{
- struct sock *sk = (struct sock *)pi;
- u16 control = 0;
-
- control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
-
- if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
- control |= L2CAP_SUPER_RCV_NOT_READY;
- pi->conn_state |= L2CAP_CONN_RNR_SENT;
- l2cap_send_sframe(pi, control);
- return;
- }
-
- if (l2cap_ertm_send(sk) > 0)
- return;
-
- control |= L2CAP_SUPER_RCV_READY;
- l2cap_send_sframe(pi, control);
-}
-
-static void l2cap_send_srejtail(struct sock *sk)
-{
- struct srej_list *tail;
- u16 control;
-
- control = L2CAP_SUPER_SELECT_REJECT;
- control |= L2CAP_CTRL_FINAL;
-
- tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list);
- control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
-
- l2cap_send_sframe(l2cap_pi(sk), control);
-}
-
-static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
-{
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- struct sk_buff **frag;
- int err, sent = 0;
-
- if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
- return -EFAULT;
-
- sent += count;
- len -= count;
-
- /* Continuation fragments (no L2CAP header) */
- frag = &skb_shinfo(skb)->frag_list;
- while (len) {
- count = min_t(unsigned int, conn->mtu, len);
-
- *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
- if (!*frag)
- return err;
- if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
- return -EFAULT;
-
- sent += count;
- len -= count;
-
- frag = &(*frag)->next;
- }
-
- return sent;
-}
-
-static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len)
-{
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- struct sk_buff *skb;
- int err, count, hlen = L2CAP_HDR_SIZE + 2;
- struct l2cap_hdr *lh;
-
- BT_DBG("sk %p len %d", sk, (int)len);
-
- count = min_t(unsigned int, (conn->mtu - hlen), len);
- skb = bt_skb_send_alloc(sk, count + hlen,
- msg->msg_flags & MSG_DONTWAIT, &err);
- if (!skb)
- return ERR_PTR(err);
-
- /* Create L2CAP header */
- lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
- lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
- lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
- put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2));
-
- err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
- if (unlikely(err < 0)) {
- kfree_skb(skb);
- return ERR_PTR(err);
- }
- return skb;
-}
-
-static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len)
-{
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- struct sk_buff *skb;
- int err, count, hlen = L2CAP_HDR_SIZE;
- struct l2cap_hdr *lh;
-
- BT_DBG("sk %p len %d", sk, (int)len);
-
- count = min_t(unsigned int, (conn->mtu - hlen), len);
- skb = bt_skb_send_alloc(sk, count + hlen,
- msg->msg_flags & MSG_DONTWAIT, &err);
- if (!skb)
- return ERR_PTR(err);
-
- /* Create L2CAP header */
- lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
- lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
- lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
-
- err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
- if (unlikely(err < 0)) {
- kfree_skb(skb);
- return ERR_PTR(err);
- }
- return skb;
-}
-
-static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
-{
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- struct sk_buff *skb;
- int err, count, hlen = L2CAP_HDR_SIZE + 2;
- struct l2cap_hdr *lh;
-
- BT_DBG("sk %p len %d", sk, (int)len);
-
- if (!conn)
- return ERR_PTR(-ENOTCONN);
-
- if (sdulen)
- hlen += 2;
-
- if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
- hlen += 2;
-
- count = min_t(unsigned int, (conn->mtu - hlen), len);
- skb = bt_skb_send_alloc(sk, count + hlen,
- msg->msg_flags & MSG_DONTWAIT, &err);
- if (!skb)
- return ERR_PTR(err);
-
- /* Create L2CAP header */
- lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
- lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
- lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
- put_unaligned_le16(control, skb_put(skb, 2));
- if (sdulen)
- put_unaligned_le16(sdulen, skb_put(skb, 2));
-
- err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
- if (unlikely(err < 0)) {
- kfree_skb(skb);
- return ERR_PTR(err);
- }
-
- if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
- put_unaligned_le16(0, skb_put(skb, 2));
-
- bt_cb(skb)->retries = 0;
- return skb;
-}
-
-static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct sk_buff *skb;
- struct sk_buff_head sar_queue;
- u16 control;
- size_t size = 0;
-
- skb_queue_head_init(&sar_queue);
- control = L2CAP_SDU_START;
- skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len);
- if (IS_ERR(skb))
- return PTR_ERR(skb);
-
- __skb_queue_tail(&sar_queue, skb);
- len -= pi->remote_mps;
- size += pi->remote_mps;
-
- while (len > 0) {
- size_t buflen;
-
- if (len > pi->remote_mps) {
- control = L2CAP_SDU_CONTINUE;
- buflen = pi->remote_mps;
- } else {
- control = L2CAP_SDU_END;
- buflen = len;
- }
-
- skb = l2cap_create_iframe_pdu(sk, 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, TX_QUEUE(sk));
- if (sk->sk_send_head == NULL)
- sk->sk_send_head = sar_queue.next;
-
- return size;
-}
-
-static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
-{
- struct sock *sk = sock->sk;
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct sk_buff *skb;
- u16 control;
- int err;
-
- BT_DBG("sock %p, sk %p", sock, sk);
-
- err = sock_error(sk);
- if (err)
- return err;
-
- if (msg->msg_flags & MSG_OOB)
- return -EOPNOTSUPP;
-
- lock_sock(sk);
-
- if (sk->sk_state != BT_CONNECTED) {
- err = -ENOTCONN;
- goto done;
- }
-
- /* Connectionless channel */
- if (sk->sk_type == SOCK_DGRAM) {
- skb = l2cap_create_connless_pdu(sk, msg, len);
- if (IS_ERR(skb)) {
- err = PTR_ERR(skb);
- } else {
- l2cap_do_send(sk, skb);
- err = len;
- }
- goto done;
- }
-
- switch (pi->mode) {
- case L2CAP_MODE_BASIC:
- /* Check outgoing MTU */
- if (len > pi->omtu) {
- err = -EMSGSIZE;
- goto done;
- }
-
- /* Create a basic PDU */
- skb = l2cap_create_basic_pdu(sk, msg, len);
- if (IS_ERR(skb)) {
- err = PTR_ERR(skb);
- goto done;
- }
-
- l2cap_do_send(sk, skb);
- err = len;
- break;
-
- case L2CAP_MODE_ERTM:
- case L2CAP_MODE_STREAMING:
- /* Entire SDU fits into one PDU */
- if (len <= pi->remote_mps) {
- control = L2CAP_SDU_UNSEGMENTED;
- skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
- if (IS_ERR(skb)) {
- err = PTR_ERR(skb);
- goto done;
- }
- __skb_queue_tail(TX_QUEUE(sk), skb);
-
- if (sk->sk_send_head == NULL)
- sk->sk_send_head = skb;
-
- } else {
- /* Segment SDU into multiples PDUs */
- err = l2cap_sar_segment_sdu(sk, msg, len);
- if (err < 0)
- goto done;
- }
-
- if (pi->mode == L2CAP_MODE_STREAMING) {
- l2cap_streaming_send(sk);
- } else {
- if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
- (pi->conn_state & L2CAP_CONN_WAIT_F)) {
- err = len;
- break;
- }
- err = l2cap_ertm_send(sk);
- }
-
- if (err >= 0)
- err = len;
- break;
-
- default:
- BT_DBG("bad state %1.1x", pi->mode);
- err = -EBADFD;
- }
-
-done:
- release_sock(sk);
- return err;
-}
-
-static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
-{
- struct sock *sk = sock->sk;
-
- lock_sock(sk);
-
- if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
- struct l2cap_conn_rsp rsp;
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- u8 buf[128];
-
- sk->sk_state = BT_CONFIG;
-
- rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
- rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
- rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
- rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
- l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
- L2CAP_CONN_RSP, sizeof(rsp), &rsp);
-
- if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) {
- release_sock(sk);
- return 0;
- }
-
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
- l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, buf), buf);
- l2cap_pi(sk)->num_conf_req++;
-
- release_sock(sk);
- return 0;
- }
-
- release_sock(sk);
-
- if (sock->type == SOCK_STREAM)
- return bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
-
- return bt_sock_recvmsg(iocb, sock, msg, len, flags);
-}
-
-static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
-{
- struct sock *sk = sock->sk;
- struct l2cap_options opts;
- int len, err = 0;
- u32 opt;
-
- BT_DBG("sk %p", sk);
-
- lock_sock(sk);
-
- switch (optname) {
- case L2CAP_OPTIONS:
- if (sk->sk_state == BT_CONNECTED) {
- err = -EINVAL;
- break;
- }
-
- opts.imtu = l2cap_pi(sk)->imtu;
- opts.omtu = l2cap_pi(sk)->omtu;
- opts.flush_to = l2cap_pi(sk)->flush_to;
- opts.mode = l2cap_pi(sk)->mode;
- opts.fcs = l2cap_pi(sk)->fcs;
- opts.max_tx = l2cap_pi(sk)->max_tx;
- opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
-
- len = min_t(unsigned int, sizeof(opts), optlen);
- if (copy_from_user((char *) &opts, optval, len)) {
- err = -EFAULT;
- break;
- }
-
- if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
- err = -EINVAL;
- break;
- }
-
- l2cap_pi(sk)->mode = opts.mode;
- switch (l2cap_pi(sk)->mode) {
- case L2CAP_MODE_BASIC:
- l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE;
- break;
- case L2CAP_MODE_ERTM:
- case L2CAP_MODE_STREAMING:
- if (!disable_ertm)
- break;
- /* fall through */
- default:
- err = -EINVAL;
- break;
- }
-
- l2cap_pi(sk)->imtu = opts.imtu;
- l2cap_pi(sk)->omtu = opts.omtu;
- l2cap_pi(sk)->fcs = opts.fcs;
- l2cap_pi(sk)->max_tx = opts.max_tx;
- l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size;
- break;
-
- case L2CAP_LM:
- if (get_user(opt, (u32 __user *) optval)) {
- err = -EFAULT;
- break;
- }
-
- if (opt & L2CAP_LM_AUTH)
- l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
- if (opt & L2CAP_LM_ENCRYPT)
- l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
- if (opt & L2CAP_LM_SECURE)
- l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
-
- l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
- l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
- break;
-
- default:
- err = -ENOPROTOOPT;
- break;
- }
-
- release_sock(sk);
- return err;
-}
-
-static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
-{
- struct sock *sk = sock->sk;
- struct bt_security sec;
- int len, err = 0;
- u32 opt;
-
- BT_DBG("sk %p", sk);
-
- if (level == SOL_L2CAP)
- return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
-
- if (level != SOL_BLUETOOTH)
- return -ENOPROTOOPT;
-
- lock_sock(sk);
-
- switch (optname) {
- case BT_SECURITY:
- if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
- && sk->sk_type != SOCK_RAW) {
- err = -EINVAL;
- break;
- }
-
- sec.level = BT_SECURITY_LOW;
-
- len = min_t(unsigned int, sizeof(sec), optlen);
- if (copy_from_user((char *) &sec, optval, len)) {
- err = -EFAULT;
- break;
- }
-
- if (sec.level < BT_SECURITY_LOW ||
- sec.level > BT_SECURITY_HIGH) {
- err = -EINVAL;
- break;
- }
-
- l2cap_pi(sk)->sec_level = sec.level;
- break;
-
- case BT_DEFER_SETUP:
- if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
- err = -EINVAL;
- break;
- }
-
- if (get_user(opt, (u32 __user *) optval)) {
- err = -EFAULT;
- break;
- }
-
- bt_sk(sk)->defer_setup = opt;
- break;
-
- case BT_FLUSHABLE:
- if (get_user(opt, (u32 __user *) optval)) {
- err = -EFAULT;
- break;
- }
-
- if (opt > BT_FLUSHABLE_ON) {
- err = -EINVAL;
- break;
- }
-
- if (opt == BT_FLUSHABLE_OFF) {
- struct l2cap_conn *conn = l2cap_pi(sk)->conn;
- /* proceed futher only when we have l2cap_conn and
- No Flush support in the LM */
- if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
- err = -EINVAL;
- break;
- }
- }
-
- l2cap_pi(sk)->flushable = opt;
- break;
-
- default:
- err = -ENOPROTOOPT;
- break;
- }
-
- release_sock(sk);
- return err;
-}
-
-static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
-{
- struct sock *sk = sock->sk;
- struct l2cap_options opts;
- struct l2cap_conninfo cinfo;
- int len, err = 0;
- u32 opt;
-
- BT_DBG("sk %p", sk);
-
- if (get_user(len, optlen))
- return -EFAULT;
-
- lock_sock(sk);
-
- switch (optname) {
- case L2CAP_OPTIONS:
- opts.imtu = l2cap_pi(sk)->imtu;
- opts.omtu = l2cap_pi(sk)->omtu;
- opts.flush_to = l2cap_pi(sk)->flush_to;
- opts.mode = l2cap_pi(sk)->mode;
- opts.fcs = l2cap_pi(sk)->fcs;
- opts.max_tx = l2cap_pi(sk)->max_tx;
- opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
-
- len = min_t(unsigned int, len, sizeof(opts));
- if (copy_to_user(optval, (char *) &opts, len))
- err = -EFAULT;
-
- break;
-
- case L2CAP_LM:
- switch (l2cap_pi(sk)->sec_level) {
- case BT_SECURITY_LOW:
- opt = L2CAP_LM_AUTH;
- break;
- case BT_SECURITY_MEDIUM:
- opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
- break;
- case BT_SECURITY_HIGH:
- opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
- L2CAP_LM_SECURE;
- break;
- default:
- opt = 0;
- break;
- }
-
- if (l2cap_pi(sk)->role_switch)
- opt |= L2CAP_LM_MASTER;
-
- if (l2cap_pi(sk)->force_reliable)
- opt |= L2CAP_LM_RELIABLE;
-
- if (put_user(opt, (u32 __user *) optval))
- err = -EFAULT;
- break;
-
- case L2CAP_CONNINFO:
- if (sk->sk_state != BT_CONNECTED &&
- !(sk->sk_state == BT_CONNECT2 &&
- bt_sk(sk)->defer_setup)) {
- err = -ENOTCONN;
- break;
- }
-
- cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
- memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
-
- len = min_t(unsigned int, len, sizeof(cinfo));
- if (copy_to_user(optval, (char *) &cinfo, len))
- err = -EFAULT;
-
- break;
-
- default:
- err = -ENOPROTOOPT;
- break;
- }
-
- release_sock(sk);
- return err;
-}
-
-static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
-{
- struct sock *sk = sock->sk;
- struct bt_security sec;
- int len, err = 0;
-
- BT_DBG("sk %p", sk);
-
- if (level == SOL_L2CAP)
- return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
-
- if (level != SOL_BLUETOOTH)
- return -ENOPROTOOPT;
-
- if (get_user(len, optlen))
- return -EFAULT;
-
- lock_sock(sk);
-
- switch (optname) {
- case BT_SECURITY:
- if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
- && sk->sk_type != SOCK_RAW) {
- err = -EINVAL;
- break;
- }
-
- sec.level = l2cap_pi(sk)->sec_level;
-
- len = min_t(unsigned int, len, sizeof(sec));
- if (copy_to_user(optval, (char *) &sec, len))
- err = -EFAULT;
-
- break;
-
- case BT_DEFER_SETUP:
- if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
- err = -EINVAL;
- break;
- }
-
- if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
- err = -EFAULT;
-
- break;
-
- case BT_FLUSHABLE:
- if (put_user(l2cap_pi(sk)->flushable, (u32 __user *) optval))
- err = -EFAULT;
-
- break;
-
- default:
- err = -ENOPROTOOPT;
- break;
- }
-
- release_sock(sk);
- return err;
-}
-
-static int l2cap_sock_shutdown(struct socket *sock, int how)
-{
- struct sock *sk = sock->sk;
- int err = 0;
-
- BT_DBG("sock %p, sk %p", sock, sk);
-
- if (!sk)
- return 0;
-
- lock_sock(sk);
- if (!sk->sk_shutdown) {
- if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
- err = __l2cap_wait_ack(sk);
-
- sk->sk_shutdown = SHUTDOWN_MASK;
- l2cap_sock_clear_timer(sk);
- __l2cap_sock_close(sk, 0);
-
- if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
- err = bt_sock_wait_state(sk, BT_CLOSED,
- sk->sk_lingertime);
- }
-
- if (!err && sk->sk_err)
- err = -sk->sk_err;
-
- release_sock(sk);
- return err;
-}
-
-static int l2cap_sock_release(struct socket *sock)
-{
- struct sock *sk = sock->sk;
- int err;
-
- BT_DBG("sock %p, sk %p", sock, sk);
-
- if (!sk)
- return 0;
-
- err = l2cap_sock_shutdown(sock, 2);
-
- sock_orphan(sk);
- l2cap_sock_kill(sk);
- return err;
-}
-
-static void l2cap_chan_ready(struct sock *sk)
-{
- struct sock *parent = bt_sk(sk)->parent;
-
- BT_DBG("sk %p, parent %p", sk, parent);
-
- l2cap_pi(sk)->conf_state = 0;
- l2cap_sock_clear_timer(sk);
-
- if (!parent) {
- /* Outgoing channel.
- * Wake up socket sleeping on connect.
- */
- sk->sk_state = BT_CONNECTED;
- sk->sk_state_change(sk);
- } else {
- /* Incoming channel.
- * Wake up socket sleeping on accept.
- */
- parent->sk_data_ready(parent, 0);
- }
-}
-
-/* Copy frame to all raw sockets on that connection */
-static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
-{
- struct l2cap_chan_list *l = &conn->chan_list;
- struct sk_buff *nskb;
- struct sock *sk;
-
- BT_DBG("conn %p", conn);
-
- read_lock(&l->lock);
- for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
- if (sk->sk_type != SOCK_RAW)
- continue;
-
- /* Don't send frame to the socket it came from */
- if (skb->sk == sk)
- continue;
- nskb = skb_clone(skb, GFP_ATOMIC);
- if (!nskb)
- continue;
-
- if (sock_queue_rcv_skb(sk, nskb))
- kfree_skb(nskb);
- }
- read_unlock(&l->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);
- lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
-
- cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
- cmd->code = code;
- cmd->ident = ident;
- cmd->len = cpu_to_le16(dlen);
-
- if (dlen) {
- count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
- memcpy(skb_put(skb, count), data, count);
- data += count;
- }
-
- len -= skb->len;
-
- /* Continuation fragments (no L2CAP header) */
- frag = &skb_shinfo(skb)->frag_list;
- while (len) {
- count = min_t(unsigned int, conn->mtu, len);
-
- *frag = bt_skb_alloc(count, GFP_ATOMIC);
- if (!*frag)
- goto fail;
-
- memcpy(skb_put(*frag, count), data, count);
-
- len -= count;
- data += count;
-
- frag = &(*frag)->next;
- }
-
- return skb;
-
-fail:
- kfree_skb(skb);
- return NULL;
-}
-
-static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
-{
- struct l2cap_conf_opt *opt = *ptr;
- int len;
-
- len = L2CAP_CONF_OPT_SIZE + opt->len;
- *ptr += len;
-
- *type = opt->type;
- *olen = opt->len;
-
- switch (opt->len) {
- case 1:
- *val = *((u8 *) opt->val);
- break;
-
- case 2:
- *val = get_unaligned_le16(opt->val);
- break;
-
- case 4:
- *val = get_unaligned_le32(opt->val);
- break;
-
- default:
- *val = (unsigned long) opt->val;
- break;
- }
-
- BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
- return len;
-}
-
-static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
-{
- struct l2cap_conf_opt *opt = *ptr;
-
- BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
-
- opt->type = type;
- opt->len = len;
-
- switch (len) {
- case 1:
- *((u8 *) opt->val) = val;
- break;
-
- case 2:
- put_unaligned_le16(val, opt->val);
- break;
-
- case 4:
- put_unaligned_le32(val, opt->val);
- break;
-
- default:
- memcpy(opt->val, (void *) val, len);
- break;
- }
-
- *ptr += L2CAP_CONF_OPT_SIZE + len;
-}
-
-static void l2cap_ack_timeout(unsigned long arg)
-{
- struct sock *sk = (void *) arg;
-
- bh_lock_sock(sk);
- l2cap_send_ack(l2cap_pi(sk));
- bh_unlock_sock(sk);
-}
-
-static inline void l2cap_ertm_init(struct sock *sk)
-{
- l2cap_pi(sk)->expected_ack_seq = 0;
- l2cap_pi(sk)->unacked_frames = 0;
- l2cap_pi(sk)->buffer_seq = 0;
- l2cap_pi(sk)->num_acked = 0;
- l2cap_pi(sk)->frames_sent = 0;
-
- setup_timer(&l2cap_pi(sk)->retrans_timer,
- l2cap_retrans_timeout, (unsigned long) sk);
- setup_timer(&l2cap_pi(sk)->monitor_timer,
- l2cap_monitor_timeout, (unsigned long) sk);
- setup_timer(&l2cap_pi(sk)->ack_timer,
- l2cap_ack_timeout, (unsigned long) sk);
-
- __skb_queue_head_init(SREJ_QUEUE(sk));
- __skb_queue_head_init(BUSY_QUEUE(sk));
-
- INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work);
-
- sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
-}
-
-static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
-{
- switch (mode) {
- case L2CAP_MODE_STREAMING:
- case L2CAP_MODE_ERTM:
- if (l2cap_mode_supported(mode, remote_feat_mask))
- return mode;
- /* fall through */
- default:
- return L2CAP_MODE_BASIC;
- }
-}
-
-static int l2cap_build_conf_req(struct sock *sk, void *data)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct l2cap_conf_req *req = data;
- struct l2cap_conf_rfc rfc = { .mode = pi->mode };
- void *ptr = req->data;
-
- BT_DBG("sk %p", sk);
-
- if (pi->num_conf_req || pi->num_conf_rsp)
- goto done;
-
- switch (pi->mode) {
- case L2CAP_MODE_STREAMING:
- case L2CAP_MODE_ERTM:
- if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE)
- break;
-
- /* fall through */
- default:
- pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
- break;
- }
-
-done:
- if (pi->imtu != L2CAP_DEFAULT_MTU)
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
-
- switch (pi->mode) {
- case L2CAP_MODE_BASIC:
- if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) &&
- !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING))
- break;
-
- rfc.mode = L2CAP_MODE_BASIC;
- rfc.txwin_size = 0;
- rfc.max_transmit = 0;
- rfc.retrans_timeout = 0;
- rfc.monitor_timeout = 0;
- rfc.max_pdu_size = 0;
-
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
- (unsigned long) &rfc);
- break;
-
- case L2CAP_MODE_ERTM:
- rfc.mode = L2CAP_MODE_ERTM;
- rfc.txwin_size = pi->tx_win;
- rfc.max_transmit = pi->max_tx;
- rfc.retrans_timeout = 0;
- rfc.monitor_timeout = 0;
- rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
- if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
- rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
-
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
- (unsigned long) &rfc);
-
- if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
- break;
-
- if (pi->fcs == L2CAP_FCS_NONE ||
- pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
- pi->fcs = L2CAP_FCS_NONE;
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
- }
- break;
-
- case L2CAP_MODE_STREAMING:
- rfc.mode = L2CAP_MODE_STREAMING;
- rfc.txwin_size = 0;
- rfc.max_transmit = 0;
- rfc.retrans_timeout = 0;
- rfc.monitor_timeout = 0;
- rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
- if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
- rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
-
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
- (unsigned long) &rfc);
-
- if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
- break;
-
- if (pi->fcs == L2CAP_FCS_NONE ||
- pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
- pi->fcs = L2CAP_FCS_NONE;
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
- }
- break;
- }
-
- /* FIXME: Need actual value of the flush timeout */
- //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
- // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
-
- req->dcid = cpu_to_le16(pi->dcid);
- req->flags = cpu_to_le16(0);
-
- return ptr - data;
-}
-
-static int l2cap_parse_conf_req(struct sock *sk, void *data)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct l2cap_conf_rsp *rsp = data;
- void *ptr = rsp->data;
- void *req = pi->conf_req;
- int len = pi->conf_len;
- int type, hint, olen;
- unsigned long val;
- struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
- u16 mtu = L2CAP_DEFAULT_MTU;
- u16 result = L2CAP_CONF_SUCCESS;
-
- BT_DBG("sk %p", sk);
-
- 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:
- pi->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)
- pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
-
- break;
-
- default:
- if (hint)
- break;
-
- result = L2CAP_CONF_UNKNOWN;
- *((u8 *) ptr++) = type;
- break;
- }
- }
-
- if (pi->num_conf_rsp || pi->num_conf_req > 1)
- goto done;
-
- switch (pi->mode) {
- case L2CAP_MODE_STREAMING:
- case L2CAP_MODE_ERTM:
- if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
- pi->mode = l2cap_select_mode(rfc.mode,
- pi->conn->feat_mask);
- break;
- }
-
- if (pi->mode != rfc.mode)
- return -ECONNREFUSED;
-
- break;
- }
-
-done:
- if (pi->mode != rfc.mode) {
- result = L2CAP_CONF_UNACCEPT;
- rfc.mode = pi->mode;
-
- if (pi->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 {
- pi->omtu = mtu;
- pi->conf_state |= L2CAP_CONF_MTU_DONE;
- }
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
-
- switch (rfc.mode) {
- case L2CAP_MODE_BASIC:
- pi->fcs = L2CAP_FCS_NONE;
- pi->conf_state |= L2CAP_CONF_MODE_DONE;
- break;
-
- case L2CAP_MODE_ERTM:
- pi->remote_tx_win = rfc.txwin_size;
- pi->remote_max_tx = rfc.max_transmit;
-
- if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10)
- rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
-
- pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
-
- rfc.retrans_timeout =
- le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
- rfc.monitor_timeout =
- le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
-
- pi->conf_state |= L2CAP_CONF_MODE_DONE;
-
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
- sizeof(rfc), (unsigned long) &rfc);
-
- break;
-
- case L2CAP_MODE_STREAMING:
- if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10)
- rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
-
- pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
-
- pi->conf_state |= L2CAP_CONF_MODE_DONE;
-
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
- sizeof(rfc), (unsigned long) &rfc);
-
- break;
-
- default:
- result = L2CAP_CONF_UNACCEPT;
-
- memset(&rfc, 0, sizeof(rfc));
- rfc.mode = pi->mode;
- }
-
- if (result == L2CAP_CONF_SUCCESS)
- pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
- }
- rsp->scid = cpu_to_le16(pi->dcid);
- rsp->result = cpu_to_le16(result);
- rsp->flags = cpu_to_le16(0x0000);
-
- return ptr - data;
-}
-
-static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct l2cap_conf_req *req = data;
- void *ptr = req->data;
- int type, olen;
- unsigned long val;
- struct l2cap_conf_rfc rfc;
-
- BT_DBG("sk %p, rsp %p, len %d, req %p", sk, 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;
- pi->imtu = L2CAP_DEFAULT_MIN_MTU;
- } else
- pi->imtu = val;
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
- break;
-
- case L2CAP_CONF_FLUSH_TO:
- pi->flush_to = val;
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
- 2, pi->flush_to);
- break;
-
- case L2CAP_CONF_RFC:
- if (olen == sizeof(rfc))
- memcpy(&rfc, (void *)val, olen);
-
- if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
- rfc.mode != pi->mode)
- return -ECONNREFUSED;
-
- pi->fcs = 0;
-
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
- sizeof(rfc), (unsigned long) &rfc);
- break;
- }
- }
-
- if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode)
- return -ECONNREFUSED;
-
- pi->mode = rfc.mode;
-
- if (*result == L2CAP_CONF_SUCCESS) {
- switch (rfc.mode) {
- case L2CAP_MODE_ERTM:
- pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
- pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
- pi->mps = le16_to_cpu(rfc.max_pdu_size);
- break;
- case L2CAP_MODE_STREAMING:
- pi->mps = le16_to_cpu(rfc.max_pdu_size);
- }
- }
-
- req->dcid = cpu_to_le16(pi->dcid);
- req->flags = cpu_to_le16(0x0000);
-
- return ptr - data;
-}
-
-static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
-{
- struct l2cap_conf_rsp *rsp = data;
- void *ptr = rsp->data;
-
- BT_DBG("sk %p", sk);
-
- rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
- rsp->result = cpu_to_le16(result);
- rsp->flags = cpu_to_le16(flags);
-
- return ptr - data;
-}
-
-static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- int type, olen;
- unsigned long val;
- struct l2cap_conf_rfc rfc;
-
- BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
-
- if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
- return;
-
- while (len >= L2CAP_CONF_OPT_SIZE) {
- len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
-
- switch (type) {
- case L2CAP_CONF_RFC:
- if (olen == sizeof(rfc))
- memcpy(&rfc, (void *)val, olen);
- goto done;
- }
- }
-
-done:
- switch (rfc.mode) {
- case L2CAP_MODE_ERTM:
- pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
- pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
- pi->mps = le16_to_cpu(rfc.max_pdu_size);
- break;
- case L2CAP_MODE_STREAMING:
- pi->mps = le16_to_cpu(rfc.max_pdu_size);
- }
-}
-
-static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
-{
- struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
-
- if (rej->reason != 0x0000)
- return 0;
-
- if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
- cmd->ident == conn->info_ident) {
- del_timer(&conn->info_timer);
-
- conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
- conn->info_ident = 0;
-
- l2cap_conn_start(conn);
- }
-
- return 0;
-}
-
-static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
-{
- struct l2cap_chan_list *list = &conn->chan_list;
- struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
- struct l2cap_conn_rsp rsp;
- 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 */
- parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
- if (!parent) {
- result = L2CAP_CR_BAD_PSM;
- goto sendresp;
- }
-
- bh_lock_sock(parent);
-
- /* Check if the ACL is secure enough (if not SDP) */
- if (psm != cpu_to_le16(0x0001) &&
- !hci_conn_check_link_mode(conn->hcon)) {
- conn->disc_reason = 0x05;
- result = L2CAP_CR_SEC_BLOCK;
- goto response;
- }
-
- result = L2CAP_CR_NO_MEM;
-
- /* Check for backlog size */
- if (sk_acceptq_is_full(parent)) {
- BT_DBG("backlog full %d", parent->sk_ack_backlog);
- goto response;
- }
-
- sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
- if (!sk)
- goto response;
-
- write_lock_bh(&list->lock);
-
- /* Check if we already have channel with that dcid */
- if (__l2cap_get_chan_by_dcid(list, scid)) {
- write_unlock_bh(&list->lock);
- sock_set_flag(sk, SOCK_ZAPPED);
- l2cap_sock_kill(sk);
- goto response;
- }
-
- hci_conn_hold(conn->hcon);
-
- l2cap_sock_init(sk, parent);
- bacpy(&bt_sk(sk)->src, conn->src);
- bacpy(&bt_sk(sk)->dst, conn->dst);
- l2cap_pi(sk)->psm = psm;
- l2cap_pi(sk)->dcid = scid;
-
- __l2cap_chan_add(conn, sk, parent);
- dcid = l2cap_pi(sk)->scid;
-
- l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
-
- l2cap_pi(sk)->ident = cmd->ident;
-
- if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
- if (l2cap_check_security(sk)) {
- if (bt_sk(sk)->defer_setup) {
- sk->sk_state = BT_CONNECT2;
- result = L2CAP_CR_PEND;
- status = L2CAP_CS_AUTHOR_PEND;
- parent->sk_data_ready(parent, 0);
- } else {
- sk->sk_state = BT_CONFIG;
- result = L2CAP_CR_SUCCESS;
- status = L2CAP_CS_NO_INFO;
- }
- } else {
- sk->sk_state = BT_CONNECT2;
- result = L2CAP_CR_PEND;
- status = L2CAP_CS_AUTHEN_PEND;
- }
- } else {
- sk->sk_state = BT_CONNECT2;
- result = L2CAP_CR_PEND;
- status = L2CAP_CS_NO_INFO;
- }
-
- write_unlock_bh(&list->lock);
-
-response:
- bh_unlock_sock(parent);
-
-sendresp:
- rsp.scid = cpu_to_le16(scid);
- rsp.dcid = cpu_to_le16(dcid);
- rsp.result = cpu_to_le16(result);
- rsp.status = cpu_to_le16(status);
- l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
-
- if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
- struct l2cap_info_req info;
- info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
-
- conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
- conn->info_ident = l2cap_get_ident(conn);
-
- mod_timer(&conn->info_timer, jiffies +
- msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
-
- l2cap_send_cmd(conn, conn->info_ident,
- L2CAP_INFO_REQ, sizeof(info), &info);
- }
-
- if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) &&
- result == L2CAP_CR_SUCCESS) {
- u8 buf[128];
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
- l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, buf), buf);
- l2cap_pi(sk)->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 sock *sk;
- u8 req[128];
-
- scid = __le16_to_cpu(rsp->scid);
- dcid = __le16_to_cpu(rsp->dcid);
- result = __le16_to_cpu(rsp->result);
- status = __le16_to_cpu(rsp->status);
-
- BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
-
- if (scid) {
- sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
- if (!sk)
- return -EFAULT;
- } else {
- sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
- if (!sk)
- return -EFAULT;
- }
-
- switch (result) {
- case L2CAP_CR_SUCCESS:
- sk->sk_state = BT_CONFIG;
- l2cap_pi(sk)->ident = 0;
- l2cap_pi(sk)->dcid = dcid;
- l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
-
- if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)
- break;
-
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
-
- l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, req), req);
- l2cap_pi(sk)->num_conf_req++;
- break;
-
- case L2CAP_CR_PEND:
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
- break;
-
- default:
- /* don't delete l2cap channel if sk is owned by user */
- if (sock_owned_by_user(sk)) {
- sk->sk_state = BT_DISCONN;
- l2cap_sock_clear_timer(sk);
- l2cap_sock_set_timer(sk, HZ / 5);
- break;
- }
-
- l2cap_chan_del(sk, ECONNREFUSED);
- break;
- }
-
- bh_unlock_sock(sk);
- return 0;
-}
-
-static inline void set_default_fcs(struct l2cap_pinfo *pi)
-{
- /* FCS is enabled only in ERTM or streaming mode, if one or both
- * sides request it.
- */
- if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING)
- pi->fcs = L2CAP_FCS_NONE;
- else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV))
- pi->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 sock *sk;
- int len;
-
- dcid = __le16_to_cpu(req->dcid);
- flags = __le16_to_cpu(req->flags);
-
- BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
-
- sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
- if (!sk)
- return -ENOENT;
-
- if (sk->sk_state != BT_CONFIG) {
- struct l2cap_cmd_rej rej;
-
- rej.reason = cpu_to_le16(0x0002);
- l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
- sizeof(rej), &rej);
- goto unlock;
- }
-
- /* Reject if config buffer is too small. */
- len = cmd_len - sizeof(*req);
- if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
- l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
- l2cap_build_conf_rsp(sk, rsp,
- L2CAP_CONF_REJECT, flags), rsp);
- goto unlock;
- }
-
- /* Store config. */
- memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
- l2cap_pi(sk)->conf_len += len;
-
- if (flags & 0x0001) {
- /* Incomplete config. Send empty response. */
- l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
- l2cap_build_conf_rsp(sk, rsp,
- L2CAP_CONF_SUCCESS, 0x0001), rsp);
- goto unlock;
- }
-
- /* Complete config. */
- len = l2cap_parse_conf_req(sk, rsp);
- if (len < 0) {
- l2cap_send_disconn_req(conn, sk, ECONNRESET);
- goto unlock;
- }
-
- l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
- l2cap_pi(sk)->num_conf_rsp++;
-
- /* Reset config buffer. */
- l2cap_pi(sk)->conf_len = 0;
-
- if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
- goto unlock;
-
- if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
- set_default_fcs(l2cap_pi(sk));
-
- sk->sk_state = BT_CONNECTED;
-
- l2cap_pi(sk)->next_tx_seq = 0;
- l2cap_pi(sk)->expected_tx_seq = 0;
- __skb_queue_head_init(TX_QUEUE(sk));
- if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
- l2cap_ertm_init(sk);
-
- l2cap_chan_ready(sk);
- goto unlock;
- }
-
- if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
- u8 buf[64];
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
- l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, buf), buf);
- l2cap_pi(sk)->num_conf_req++;
- }
-
-unlock:
- bh_unlock_sock(sk);
- return 0;
-}
-
-static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
-{
- struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
- u16 scid, flags, result;
- struct sock *sk;
- int len = cmd->len - sizeof(*rsp);
-
- scid = __le16_to_cpu(rsp->scid);
- flags = __le16_to_cpu(rsp->flags);
- result = __le16_to_cpu(rsp->result);
-
- BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
- scid, flags, result);
-
- sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
- if (!sk)
- return 0;
-
- switch (result) {
- case L2CAP_CONF_SUCCESS:
- l2cap_conf_rfc_get(sk, rsp->data, len);
- break;
-
- case L2CAP_CONF_UNACCEPT:
- if (l2cap_pi(sk)->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, sk, ECONNRESET);
- goto done;
- }
-
- /* throw out any old stored conf requests */
- result = L2CAP_CONF_SUCCESS;
- len = l2cap_parse_conf_rsp(sk, rsp->data,
- len, req, &result);
- if (len < 0) {
- l2cap_send_disconn_req(conn, sk, ECONNRESET);
- goto done;
- }
-
- l2cap_send_cmd(conn, l2cap_get_ident(conn),
- L2CAP_CONF_REQ, len, req);
- l2cap_pi(sk)->num_conf_req++;
- if (result != L2CAP_CONF_SUCCESS)
- goto done;
- break;
- }
-
- default:
- sk->sk_err = ECONNRESET;
- l2cap_sock_set_timer(sk, HZ * 5);
- l2cap_send_disconn_req(conn, sk, ECONNRESET);
- goto done;
- }
-
- if (flags & 0x01)
- goto done;
-
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
-
- if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
- set_default_fcs(l2cap_pi(sk));
-
- sk->sk_state = BT_CONNECTED;
- l2cap_pi(sk)->next_tx_seq = 0;
- l2cap_pi(sk)->expected_tx_seq = 0;
- __skb_queue_head_init(TX_QUEUE(sk));
- if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
- l2cap_ertm_init(sk);
-
- l2cap_chan_ready(sk);
- }
-
-done:
- bh_unlock_sock(sk);
- return 0;
-}
-
-static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
-{
- struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
- struct l2cap_disconn_rsp rsp;
- u16 dcid, scid;
- struct 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);
-
- sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
- if (!sk)
- return 0;
-
- rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
- rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
- l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
-
- sk->sk_shutdown = SHUTDOWN_MASK;
-
- /* don't delete l2cap channel if sk is owned by user */
- if (sock_owned_by_user(sk)) {
- sk->sk_state = BT_DISCONN;
- l2cap_sock_clear_timer(sk);
- l2cap_sock_set_timer(sk, HZ / 5);
- bh_unlock_sock(sk);
- return 0;
- }
-
- l2cap_chan_del(sk, ECONNRESET);
- bh_unlock_sock(sk);
-
- l2cap_sock_kill(sk);
- return 0;
-}
-
-static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
-{
- struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
- u16 dcid, scid;
- struct sock *sk;
-
- scid = __le16_to_cpu(rsp->scid);
- dcid = __le16_to_cpu(rsp->dcid);
-
- BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
-
- sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
- if (!sk)
- return 0;
-
- /* don't delete l2cap channel if sk is owned by user */
- if (sock_owned_by_user(sk)) {
- sk->sk_state = BT_DISCONN;
- l2cap_sock_clear_timer(sk);
- l2cap_sock_set_timer(sk, HZ / 5);
- bh_unlock_sock(sk);
- return 0;
- }
-
- l2cap_chan_del(sk, 0);
- bh_unlock_sock(sk);
-
- l2cap_sock_kill(sk);
- return 0;
-}
-
-static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
-{
- struct l2cap_info_req *req = (struct l2cap_info_req *) data;
- u16 type;
-
- type = __le16_to_cpu(req->type);
-
- BT_DBG("type 0x%4.4x", type);
-
- if (type == L2CAP_IT_FEAT_MASK) {
- u8 buf[8];
- u32 feat_mask = l2cap_feat_mask;
- struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
- rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
- rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
- if (!disable_ertm)
- feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
- | L2CAP_FEAT_FCS;
- put_unaligned_le32(feat_mask, rsp->data);
- l2cap_send_cmd(conn, cmd->ident,
- L2CAP_INFO_RSP, sizeof(buf), buf);
- } else if (type == L2CAP_IT_FIXED_CHAN) {
- u8 buf[12];
- struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
- rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
- rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
- memcpy(buf + 4, l2cap_fixed_chan, 8);
- l2cap_send_cmd(conn, cmd->ident,
- L2CAP_INFO_RSP, sizeof(buf), buf);
- } else {
- struct l2cap_info_rsp rsp;
- rsp.type = cpu_to_le16(type);
- rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
- l2cap_send_cmd(conn, cmd->ident,
- L2CAP_INFO_RSP, sizeof(rsp), &rsp);
- }
-
- return 0;
-}
-
-static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
-{
- struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
- u16 type, result;
-
- type = __le16_to_cpu(rsp->type);
- result = __le16_to_cpu(rsp->result);
-
- BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
-
- del_timer(&conn->info_timer);
-
- if (result != L2CAP_IR_SUCCESS) {
- conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
- conn->info_ident = 0;
-
- l2cap_conn_start(conn);
-
- return 0;
- }
-
- if (type == L2CAP_IT_FEAT_MASK) {
- conn->feat_mask = get_unaligned_le32(rsp->data);
-
- if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
- struct l2cap_info_req req;
- req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
-
- conn->info_ident = l2cap_get_ident(conn);
-
- l2cap_send_cmd(conn, conn->info_ident,
- L2CAP_INFO_REQ, sizeof(req), &req);
- } else {
- conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
- conn->info_ident = 0;
-
- l2cap_conn_start(conn);
- }
- } else if (type == L2CAP_IT_FIXED_CHAN) {
- conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
- conn->info_ident = 0;
-
- l2cap_conn_start(conn);
- }
-
- return 0;
-}
-
-static inline 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 = 0;
-
- 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;
- }
-
- switch (cmd.code) {
- case L2CAP_COMMAND_REJ:
- l2cap_command_rej(conn, &cmd, data);
- break;
-
- case L2CAP_CONN_REQ:
- err = l2cap_connect_req(conn, &cmd, data);
- break;
-
- case L2CAP_CONN_RSP:
- err = l2cap_connect_rsp(conn, &cmd, data);
- break;
-
- case L2CAP_CONF_REQ:
- err = l2cap_config_req(conn, &cmd, cmd_len, data);
- break;
-
- case L2CAP_CONF_RSP:
- err = l2cap_config_rsp(conn, &cmd, data);
- break;
-
- case L2CAP_DISCONN_REQ:
- err = l2cap_disconnect_req(conn, &cmd, data);
- break;
-
- case L2CAP_DISCONN_RSP:
- err = l2cap_disconnect_rsp(conn, &cmd, data);
- break;
-
- case L2CAP_ECHO_REQ:
- l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
- break;
-
- case L2CAP_ECHO_RSP:
- break;
-
- case L2CAP_INFO_REQ:
- err = l2cap_information_req(conn, &cmd, data);
- break;
-
- case L2CAP_INFO_RSP:
- err = l2cap_information_rsp(conn, &cmd, data);
- break;
-
- default:
- BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
- err = -EINVAL;
- break;
- }
-
- if (err) {
- struct l2cap_cmd_rej rej;
- BT_DBG("error %d", err);
-
- /* FIXME: Map err to a valid reason */
- rej.reason = cpu_to_le16(0);
- l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
- }
-
- data += cmd_len;
- len -= cmd_len;
- }
-
- kfree_skb(skb);
-}
-
-static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
-{
- u16 our_fcs, rcv_fcs;
- int hdr_size = L2CAP_HDR_SIZE + 2;
-
- if (pi->fcs == L2CAP_FCS_CRC16) {
- skb_trim(skb, skb->len - 2);
- rcv_fcs = get_unaligned_le16(skb->data + skb->len);
- our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
-
- if (our_fcs != rcv_fcs)
- return -EBADMSG;
- }
- return 0;
-}
-
-static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- u16 control = 0;
-
- pi->frames_sent = 0;
-
- control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
-
- if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
- control |= L2CAP_SUPER_RCV_NOT_READY;
- l2cap_send_sframe(pi, control);
- pi->conn_state |= L2CAP_CONN_RNR_SENT;
- }
-
- if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY)
- l2cap_retransmit_frames(sk);
-
- l2cap_ertm_send(sk);
-
- if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
- pi->frames_sent == 0) {
- control |= L2CAP_SUPER_RCV_READY;
- l2cap_send_sframe(pi, control);
- }
-}
-
-static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
-{
- struct sk_buff *next_skb;
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- int tx_seq_offset, next_tx_seq_offset;
-
- bt_cb(skb)->tx_seq = tx_seq;
- bt_cb(skb)->sar = sar;
-
- next_skb = skb_peek(SREJ_QUEUE(sk));
- if (!next_skb) {
- __skb_queue_tail(SREJ_QUEUE(sk), skb);
- return 0;
- }
-
- tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
- if (tx_seq_offset < 0)
- tx_seq_offset += 64;
-
- do {
- if (bt_cb(next_skb)->tx_seq == tx_seq)
- return -EINVAL;
-
- next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
- pi->buffer_seq) % 64;
- if (next_tx_seq_offset < 0)
- next_tx_seq_offset += 64;
-
- if (next_tx_seq_offset > tx_seq_offset) {
- __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
- return 0;
- }
-
- if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
- break;
-
- } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
-
- __skb_queue_tail(SREJ_QUEUE(sk), skb);
-
- return 0;
-}
-
-static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct sk_buff *_skb;
- int err;
-
- switch (control & L2CAP_CTRL_SAR) {
- case L2CAP_SDU_UNSEGMENTED:
- if (pi->conn_state & L2CAP_CONN_SAR_SDU)
- goto drop;
-
- err = sock_queue_rcv_skb(sk, skb);
- if (!err)
- return err;
-
- break;
-
- case L2CAP_SDU_START:
- if (pi->conn_state & L2CAP_CONN_SAR_SDU)
- goto drop;
-
- pi->sdu_len = get_unaligned_le16(skb->data);
-
- if (pi->sdu_len > pi->imtu)
- goto disconnect;
-
- pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
- if (!pi->sdu)
- return -ENOMEM;
-
- /* pull sdu_len bytes only after alloc, because of Local Busy
- * condition we have to be sure that this will be executed
- * only once, i.e., when alloc does not fail */
- skb_pull(skb, 2);
-
- memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
-
- pi->conn_state |= L2CAP_CONN_SAR_SDU;
- pi->partial_sdu_len = skb->len;
- break;
-
- case L2CAP_SDU_CONTINUE:
- if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
- goto disconnect;
-
- if (!pi->sdu)
- goto disconnect;
-
- pi->partial_sdu_len += skb->len;
- if (pi->partial_sdu_len > pi->sdu_len)
- goto drop;
-
- memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
-
- break;
-
- case L2CAP_SDU_END:
- if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
- goto disconnect;
-
- if (!pi->sdu)
- goto disconnect;
-
- if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) {
- pi->partial_sdu_len += skb->len;
-
- if (pi->partial_sdu_len > pi->imtu)
- goto drop;
-
- if (pi->partial_sdu_len != pi->sdu_len)
- goto drop;
-
- memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
- }
-
- _skb = skb_clone(pi->sdu, GFP_ATOMIC);
- if (!_skb) {
- pi->conn_state |= L2CAP_CONN_SAR_RETRY;
- return -ENOMEM;
- }
-
- err = sock_queue_rcv_skb(sk, _skb);
- if (err < 0) {
- kfree_skb(_skb);
- pi->conn_state |= L2CAP_CONN_SAR_RETRY;
- return err;
- }
-
- pi->conn_state &= ~L2CAP_CONN_SAR_RETRY;
- pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
-
- kfree_skb(pi->sdu);
- break;
- }
-
- kfree_skb(skb);
- return 0;
-
-drop:
- kfree_skb(pi->sdu);
- pi->sdu = NULL;
-
-disconnect:
- l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
- kfree_skb(skb);
- return 0;
-}
-
-static int l2cap_try_push_rx_skb(struct sock *sk)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct sk_buff *skb;
- u16 control;
- int err;
-
- while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) {
- control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
- err = l2cap_ertm_reassembly_sdu(sk, skb, control);
- if (err < 0) {
- skb_queue_head(BUSY_QUEUE(sk), skb);
- return -EBUSY;
- }
-
- pi->buffer_seq = (pi->buffer_seq + 1) % 64;
- }
-
- if (!(pi->conn_state & L2CAP_CONN_RNR_SENT))
- goto done;
-
- control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
- control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
- l2cap_send_sframe(pi, control);
- l2cap_pi(sk)->retry_count = 1;
-
- del_timer(&pi->retrans_timer);
- __mod_monitor_timer();
-
- l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
-
-done:
- pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
- pi->conn_state &= ~L2CAP_CONN_RNR_SENT;
-
- BT_DBG("sk %p, Exit local busy", sk);
-
- return 0;
-}
-
-static void l2cap_busy_work(struct work_struct *work)
-{
- DECLARE_WAITQUEUE(wait, current);
- struct l2cap_pinfo *pi =
- container_of(work, struct l2cap_pinfo, busy_work);
- struct sock *sk = (struct sock *)pi;
- int n_tries = 0, timeo = HZ/5, err;
- struct sk_buff *skb;
-
- lock_sock(sk);
-
- add_wait_queue(sk_sleep(sk), &wait);
- while ((skb = skb_peek(BUSY_QUEUE(sk)))) {
- set_current_state(TASK_INTERRUPTIBLE);
-
- if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
- err = -EBUSY;
- l2cap_send_disconn_req(pi->conn, sk, EBUSY);
- break;
- }
-
- if (!timeo)
- timeo = HZ/5;
-
- if (signal_pending(current)) {
- err = sock_intr_errno(timeo);
- break;
- }
-
- release_sock(sk);
- timeo = schedule_timeout(timeo);
- lock_sock(sk);
-
- err = sock_error(sk);
- if (err)
- break;
-
- if (l2cap_try_push_rx_skb(sk) == 0)
- break;
- }
-
- set_current_state(TASK_RUNNING);
- remove_wait_queue(sk_sleep(sk), &wait);
-
- release_sock(sk);
-}
-
-static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- int sctrl, err;
-
- if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
- bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
- __skb_queue_tail(BUSY_QUEUE(sk), skb);
- return l2cap_try_push_rx_skb(sk);
-
-
- }
-
- err = l2cap_ertm_reassembly_sdu(sk, skb, control);
- if (err >= 0) {
- pi->buffer_seq = (pi->buffer_seq + 1) % 64;
- return err;
- }
-
- /* Busy Condition */
- BT_DBG("sk %p, Enter local busy", sk);
-
- pi->conn_state |= L2CAP_CONN_LOCAL_BUSY;
- bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
- __skb_queue_tail(BUSY_QUEUE(sk), skb);
-
- sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
- sctrl |= L2CAP_SUPER_RCV_NOT_READY;
- l2cap_send_sframe(pi, sctrl);
-
- pi->conn_state |= L2CAP_CONN_RNR_SENT;
-
- del_timer(&pi->ack_timer);
-
- queue_work(_busy_wq, &pi->busy_work);
-
- return err;
-}
-
-static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct sk_buff *_skb;
- int err = -EINVAL;
-
- /*
- * TODO: We have to notify the userland if some data is lost with the
- * Streaming Mode.
- */
-
- switch (control & L2CAP_CTRL_SAR) {
- case L2CAP_SDU_UNSEGMENTED:
- if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
- kfree_skb(pi->sdu);
- break;
- }
-
- err = sock_queue_rcv_skb(sk, skb);
- if (!err)
- return 0;
-
- break;
-
- case L2CAP_SDU_START:
- if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
- kfree_skb(pi->sdu);
- break;
- }
-
- pi->sdu_len = get_unaligned_le16(skb->data);
- skb_pull(skb, 2);
-
- if (pi->sdu_len > pi->imtu) {
- err = -EMSGSIZE;
- break;
- }
-
- pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
- if (!pi->sdu) {
- err = -ENOMEM;
- break;
- }
-
- memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
-
- pi->conn_state |= L2CAP_CONN_SAR_SDU;
- pi->partial_sdu_len = skb->len;
- err = 0;
- break;
-
- case L2CAP_SDU_CONTINUE:
- if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
- break;
-
- memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
-
- pi->partial_sdu_len += skb->len;
- if (pi->partial_sdu_len > pi->sdu_len)
- kfree_skb(pi->sdu);
- else
- err = 0;
-
- break;
-
- case L2CAP_SDU_END:
- if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
- break;
-
- memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
-
- pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
- pi->partial_sdu_len += skb->len;
-
- if (pi->partial_sdu_len > pi->imtu)
- goto drop;
-
- if (pi->partial_sdu_len == pi->sdu_len) {
- _skb = skb_clone(pi->sdu, GFP_ATOMIC);
- err = sock_queue_rcv_skb(sk, _skb);
- if (err < 0)
- kfree_skb(_skb);
- }
- err = 0;
-
-drop:
- kfree_skb(pi->sdu);
- break;
- }
-
- kfree_skb(skb);
- return err;
-}
-
-static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
-{
- struct sk_buff *skb;
- u16 control;
-
- while ((skb = skb_peek(SREJ_QUEUE(sk)))) {
- if (bt_cb(skb)->tx_seq != tx_seq)
- break;
-
- skb = skb_dequeue(SREJ_QUEUE(sk));
- control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
- l2cap_ertm_reassembly_sdu(sk, skb, control);
- l2cap_pi(sk)->buffer_seq_srej =
- (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
- tx_seq = (tx_seq + 1) % 64;
- }
-}
-
-static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct srej_list *l, *tmp;
- u16 control;
-
- list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
- if (l->tx_seq == tx_seq) {
- list_del(&l->list);
- kfree(l);
- return;
- }
- control = L2CAP_SUPER_SELECT_REJECT;
- control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
- l2cap_send_sframe(pi, control);
- list_del(&l->list);
- list_add_tail(&l->list, SREJ_LIST(sk));
- }
-}
-
-static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- struct srej_list *new;
- u16 control;
-
- while (tx_seq != pi->expected_tx_seq) {
- control = L2CAP_SUPER_SELECT_REJECT;
- control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
- l2cap_send_sframe(pi, control);
-
- new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
- new->tx_seq = pi->expected_tx_seq;
- pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
- list_add_tail(&new->list, SREJ_LIST(sk));
- }
- pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
-}
-
-static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- u8 tx_seq = __get_txseq(rx_control);
- u8 req_seq = __get_reqseq(rx_control);
- u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
- int tx_seq_offset, expected_tx_seq_offset;
- int num_to_ack = (pi->tx_win/6) + 1;
- int err = 0;
-
- BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq,
- rx_control);
-
- if (L2CAP_CTRL_FINAL & rx_control &&
- l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
- del_timer(&pi->monitor_timer);
- if (pi->unacked_frames > 0)
- __mod_retrans_timer();
- pi->conn_state &= ~L2CAP_CONN_WAIT_F;
- }
-
- pi->expected_ack_seq = req_seq;
- l2cap_drop_acked_frames(sk);
-
- if (tx_seq == pi->expected_tx_seq)
- goto expected;
-
- tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
- if (tx_seq_offset < 0)
- tx_seq_offset += 64;
-
- /* invalid tx_seq */
- if (tx_seq_offset >= pi->tx_win) {
- l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
- goto drop;
- }
-
- if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY)
- goto drop;
-
- if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
- struct srej_list *first;
-
- first = list_first_entry(SREJ_LIST(sk),
- struct srej_list, list);
- if (tx_seq == first->tx_seq) {
- l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
- l2cap_check_srej_gap(sk, tx_seq);
-
- list_del(&first->list);
- kfree(first);
-
- if (list_empty(SREJ_LIST(sk))) {
- pi->buffer_seq = pi->buffer_seq_srej;
- pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
- l2cap_send_ack(pi);
- BT_DBG("sk %p, Exit SREJ_SENT", sk);
- }
- } else {
- struct srej_list *l;
-
- /* duplicated tx_seq */
- if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0)
- goto drop;
-
- list_for_each_entry(l, SREJ_LIST(sk), list) {
- if (l->tx_seq == tx_seq) {
- l2cap_resend_srejframe(sk, tx_seq);
- return 0;
- }
- }
- l2cap_send_srejframe(sk, tx_seq);
- }
- } else {
- expected_tx_seq_offset =
- (pi->expected_tx_seq - pi->buffer_seq) % 64;
- if (expected_tx_seq_offset < 0)
- expected_tx_seq_offset += 64;
-
- /* duplicated tx_seq */
- if (tx_seq_offset < expected_tx_seq_offset)
- goto drop;
-
- pi->conn_state |= L2CAP_CONN_SREJ_SENT;
-
- BT_DBG("sk %p, Enter SREJ", sk);
-
- INIT_LIST_HEAD(SREJ_LIST(sk));
- pi->buffer_seq_srej = pi->buffer_seq;
-
- __skb_queue_head_init(SREJ_QUEUE(sk));
- __skb_queue_head_init(BUSY_QUEUE(sk));
- l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
-
- pi->conn_state |= L2CAP_CONN_SEND_PBIT;
-
- l2cap_send_srejframe(sk, tx_seq);
-
- del_timer(&pi->ack_timer);
- }
- return 0;
-
-expected:
- pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
-
- if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
- bt_cb(skb)->tx_seq = tx_seq;
- bt_cb(skb)->sar = sar;
- __skb_queue_tail(SREJ_QUEUE(sk), skb);
- return 0;
- }
-
- err = l2cap_push_rx_skb(sk, skb, rx_control);
- if (err < 0)
- return 0;
-
- if (rx_control & L2CAP_CTRL_FINAL) {
- if (pi->conn_state & L2CAP_CONN_REJ_ACT)
- pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
- else
- l2cap_retransmit_frames(sk);
- }
-
- __mod_ack_timer();
-
- pi->num_acked = (pi->num_acked + 1) % num_to_ack;
- if (pi->num_acked == num_to_ack - 1)
- l2cap_send_ack(pi);
-
- return 0;
-
-drop:
- kfree_skb(skb);
- return 0;
-}
-
-static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
-
- BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control),
- rx_control);
-
- pi->expected_ack_seq = __get_reqseq(rx_control);
- l2cap_drop_acked_frames(sk);
-
- if (rx_control & L2CAP_CTRL_POLL) {
- pi->conn_state |= L2CAP_CONN_SEND_FBIT;
- if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
- if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
- (pi->unacked_frames > 0))
- __mod_retrans_timer();
-
- pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
- l2cap_send_srejtail(sk);
- } else {
- l2cap_send_i_or_rr_or_rnr(sk);
- }
-
- } else if (rx_control & L2CAP_CTRL_FINAL) {
- pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
-
- if (pi->conn_state & L2CAP_CONN_REJ_ACT)
- pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
- else
- l2cap_retransmit_frames(sk);
-
- } else {
- if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
- (pi->unacked_frames > 0))
- __mod_retrans_timer();
-
- pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
- if (pi->conn_state & L2CAP_CONN_SREJ_SENT)
- l2cap_send_ack(pi);
- else
- l2cap_ertm_send(sk);
- }
-}
-
-static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- u8 tx_seq = __get_reqseq(rx_control);
-
- BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
-
- pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
-
- pi->expected_ack_seq = tx_seq;
- l2cap_drop_acked_frames(sk);
-
- if (rx_control & L2CAP_CTRL_FINAL) {
- if (pi->conn_state & L2CAP_CONN_REJ_ACT)
- pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
- else
- l2cap_retransmit_frames(sk);
- } else {
- l2cap_retransmit_frames(sk);
-
- if (pi->conn_state & L2CAP_CONN_WAIT_F)
- pi->conn_state |= L2CAP_CONN_REJ_ACT;
- }
-}
-static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- u8 tx_seq = __get_reqseq(rx_control);
-
- BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
-
- pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
-
- if (rx_control & L2CAP_CTRL_POLL) {
- pi->expected_ack_seq = tx_seq;
- l2cap_drop_acked_frames(sk);
-
- pi->conn_state |= L2CAP_CONN_SEND_FBIT;
- l2cap_retransmit_one_frame(sk, tx_seq);
-
- l2cap_ertm_send(sk);
-
- if (pi->conn_state & L2CAP_CONN_WAIT_F) {
- pi->srej_save_reqseq = tx_seq;
- pi->conn_state |= L2CAP_CONN_SREJ_ACT;
- }
- } else if (rx_control & L2CAP_CTRL_FINAL) {
- if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
- pi->srej_save_reqseq == tx_seq)
- pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
- else
- l2cap_retransmit_one_frame(sk, tx_seq);
- } else {
- l2cap_retransmit_one_frame(sk, tx_seq);
- if (pi->conn_state & L2CAP_CONN_WAIT_F) {
- pi->srej_save_reqseq = tx_seq;
- pi->conn_state |= L2CAP_CONN_SREJ_ACT;
- }
- }
-}
-
-static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- u8 tx_seq = __get_reqseq(rx_control);
-
- BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
-
- pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
- pi->expected_ack_seq = tx_seq;
- l2cap_drop_acked_frames(sk);
-
- if (rx_control & L2CAP_CTRL_POLL)
- pi->conn_state |= L2CAP_CONN_SEND_FBIT;
-
- if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
- del_timer(&pi->retrans_timer);
- if (rx_control & L2CAP_CTRL_POLL)
- l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL);
- return;
- }
-
- if (rx_control & L2CAP_CTRL_POLL)
- l2cap_send_srejtail(sk);
- else
- l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
-}
-
-static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
-{
- BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
-
- if (L2CAP_CTRL_FINAL & rx_control &&
- l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
- del_timer(&l2cap_pi(sk)->monitor_timer);
- if (l2cap_pi(sk)->unacked_frames > 0)
- __mod_retrans_timer();
- l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
- }
-
- switch (rx_control & L2CAP_CTRL_SUPERVISE) {
- case L2CAP_SUPER_RCV_READY:
- l2cap_data_channel_rrframe(sk, rx_control);
- break;
-
- case L2CAP_SUPER_REJECT:
- l2cap_data_channel_rejframe(sk, rx_control);
- break;
-
- case L2CAP_SUPER_SELECT_REJECT:
- l2cap_data_channel_srejframe(sk, rx_control);
- break;
-
- case L2CAP_SUPER_RCV_NOT_READY:
- l2cap_data_channel_rnrframe(sk, rx_control);
- break;
- }
-
- kfree_skb(skb);
- return 0;
-}
-
-static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
-{
- struct l2cap_pinfo *pi = l2cap_pi(sk);
- u16 control;
- u8 req_seq;
- int len, next_tx_seq_offset, req_seq_offset;
-
- control = get_unaligned_le16(skb->data);
- skb_pull(skb, 2);
- len = skb->len;
-
- /*
- * We can just drop the corrupted I-frame here.
- * Receiver will miss it and start proper recovery
- * procedures and ask retransmission.
- */
- if (l2cap_check_fcs(pi, skb))
- goto drop;
-
- if (__is_sar_start(control) && __is_iframe(control))
- len -= 2;
-
- if (pi->fcs == L2CAP_FCS_CRC16)
- len -= 2;
-
- if (len > pi->mps) {
- l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
- goto drop;
- }
-
- req_seq = __get_reqseq(control);
- req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
- if (req_seq_offset < 0)
- req_seq_offset += 64;
-
- next_tx_seq_offset =
- (pi->next_tx_seq - pi->expected_ack_seq) % 64;
- if (next_tx_seq_offset < 0)
- next_tx_seq_offset += 64;
-
- /* check for invalid req-seq */
- if (req_seq_offset > next_tx_seq_offset) {
- l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
- goto drop;
- }
-
- if (__is_iframe(control)) {
- if (len < 0) {
- l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
- goto drop;
- }
-
- l2cap_data_channel_iframe(sk, control, skb);
- } else {
- if (len != 0) {
- BT_ERR("%d", len);
- l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
- goto drop;
- }
-
- l2cap_data_channel_sframe(sk, 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 sock *sk;
- struct l2cap_pinfo *pi;
- u16 control;
- u8 tx_seq;
- int len;
-
- sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
- if (!sk) {
- BT_DBG("unknown cid 0x%4.4x", cid);
- goto drop;
- }
-
- pi = l2cap_pi(sk);
-
- BT_DBG("sk %p, len %d", sk, skb->len);
-
- if (sk->sk_state != BT_CONNECTED)
- goto drop;
-
- switch (pi->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 (pi->imtu < skb->len)
- goto drop;
-
- if (!sock_queue_rcv_skb(sk, skb))
- goto done;
- break;
-
- case L2CAP_MODE_ERTM:
- if (!sock_owned_by_user(sk)) {
- l2cap_ertm_data_rcv(sk, skb);
- } else {
- if (sk_add_backlog(sk, skb))
- goto drop;
- }
-
- goto done;
-
- case L2CAP_MODE_STREAMING:
- control = get_unaligned_le16(skb->data);
- skb_pull(skb, 2);
- len = skb->len;
-
- if (l2cap_check_fcs(pi, skb))
- goto drop;
-
- if (__is_sar_start(control))
- len -= 2;
-
- if (pi->fcs == L2CAP_FCS_CRC16)
- len -= 2;
-
- if (len > pi->mps || len < 0 || __is_sframe(control))
- goto drop;
-
- tx_seq = __get_txseq(control);
-
- if (pi->expected_tx_seq == tx_seq)
- pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
- else
- pi->expected_tx_seq = (tx_seq + 1) % 64;
-
- l2cap_streaming_reassembly_sdu(sk, skb, control);
-
- goto done;
-
- default:
- BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
- break;
- }
-
-drop:
- kfree_skb(skb);
-
-done:
- if (sk)
- bh_unlock_sock(sk);
-
- return 0;
-}
-
-static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
-{
- struct sock *sk;
-
- sk = l2cap_get_sock_by_psm(0, psm, conn->src);
- if (!sk)
- goto drop;
-
- bh_lock_sock(sk);
-
- BT_DBG("sk %p, len %d", sk, skb->len);
-
- if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
- goto drop;
-
- if (l2cap_pi(sk)->imtu < skb->len)
- goto drop;
-
- if (!sock_queue_rcv_skb(sk, skb))
- goto done;
-
-drop:
- kfree_skb(skb);
-
-done:
- if (sk)
- bh_unlock_sock(sk);
- return 0;
-}
-
-static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
-{
- struct l2cap_hdr *lh = (void *) skb->data;
- u16 cid, len;
- __le16 psm;
-
- skb_pull(skb, L2CAP_HDR_SIZE);
- cid = __le16_to_cpu(lh->cid);
- len = __le16_to_cpu(lh->len);
-
- if (len != skb->len) {
- kfree_skb(skb);
- return;
- }
-
- BT_DBG("len %d, cid 0x%4.4x", len, cid);
-
- switch (cid) {
- case L2CAP_CID_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;
-
- default:
- l2cap_data_channel(conn, cid, skb);
- break;
- }
-}
-
-/* ---- L2CAP interface with lower layer (HCI) ---- */
-
-static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
-{
- int exact = 0, lm1 = 0, lm2 = 0;
- register struct sock *sk;
- struct hlist_node *node;
-
- if (type != ACL_LINK)
- return -EINVAL;
-
- BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
-
- /* Find listening sockets and check their link_mode */
- read_lock(&l2cap_sk_list.lock);
- sk_for_each(sk, node, &l2cap_sk_list.head) {
- if (sk->sk_state != BT_LISTEN)
- continue;
-
- if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
- lm1 |= HCI_LM_ACCEPT;
- if (l2cap_pi(sk)->role_switch)
- lm1 |= HCI_LM_MASTER;
- exact++;
- } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
- lm2 |= HCI_LM_ACCEPT;
- if (l2cap_pi(sk)->role_switch)
- lm2 |= HCI_LM_MASTER;
- }
- }
- read_unlock(&l2cap_sk_list.lock);
-
- return exact ? lm1 : lm2;
-}
-
-static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
-{
- struct l2cap_conn *conn;
-
- BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
-
- if (hcon->type != ACL_LINK)
- return -EINVAL;
-
- if (!status) {
- conn = l2cap_conn_add(hcon, status);
- if (conn)
- l2cap_conn_ready(conn);
- } else
- l2cap_conn_del(hcon, bt_err(status));
-
- return 0;
-}
-
-static int l2cap_disconn_ind(struct hci_conn *hcon)
-{
- struct l2cap_conn *conn = hcon->l2cap_data;
-
- BT_DBG("hcon %p", hcon);
-
- if (hcon->type != ACL_LINK || !conn)
- return 0x13;
-
- return conn->disc_reason;
-}
-
-static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
-{
- BT_DBG("hcon %p reason %d", hcon, reason);
-
- if (hcon->type != ACL_LINK)
- return -EINVAL;
-
- l2cap_conn_del(hcon, bt_err(reason));
-
- return 0;
-}
-
-static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
-{
- if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM)
- return;
-
- if (encrypt == 0x00) {
- if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
- l2cap_sock_clear_timer(sk);
- l2cap_sock_set_timer(sk, HZ * 5);
- } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
- __l2cap_sock_close(sk, ECONNREFUSED);
- } else {
- if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
- l2cap_sock_clear_timer(sk);
- }
-}
-
-static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
-{
- struct l2cap_chan_list *l;
- struct l2cap_conn *conn = hcon->l2cap_data;
- struct sock *sk;
-
- if (!conn)
- return 0;
-
- l = &conn->chan_list;
-
- BT_DBG("conn %p", conn);
-
- read_lock(&l->lock);
-
- for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
- bh_lock_sock(sk);
-
- if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
- bh_unlock_sock(sk);
- continue;
- }
-
- if (!status && (sk->sk_state == BT_CONNECTED ||
- sk->sk_state == BT_CONFIG)) {
- l2cap_check_encryption(sk, encrypt);
- bh_unlock_sock(sk);
- continue;
- }
-
- if (sk->sk_state == BT_CONNECT) {
- if (!status) {
- struct l2cap_conn_req req;
- req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
- req.psm = l2cap_pi(sk)->psm;
-
- l2cap_pi(sk)->ident = l2cap_get_ident(conn);
- l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
-
- l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
- L2CAP_CONN_REQ, sizeof(req), &req);
- } else {
- l2cap_sock_clear_timer(sk);
- l2cap_sock_set_timer(sk, HZ / 10);
- }
- } else if (sk->sk_state == BT_CONNECT2) {
- struct l2cap_conn_rsp rsp;
- __u16 result;
-
- if (!status) {
- sk->sk_state = BT_CONFIG;
- result = L2CAP_CR_SUCCESS;
- } else {
- sk->sk_state = BT_DISCONN;
- l2cap_sock_set_timer(sk, HZ / 10);
- result = L2CAP_CR_SEC_BLOCK;
- }
-
- rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
- rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
- rsp.result = cpu_to_le16(result);
- rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
- l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
- L2CAP_CONN_RSP, sizeof(rsp), &rsp);
- }
-
- bh_unlock_sock(sk);
- }
-
- read_unlock(&l->lock);
-
- return 0;
-}
-
-static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
-{
- struct l2cap_conn *conn = hcon->l2cap_data;
-
- if (!conn)
- conn = l2cap_conn_add(hcon, 0);
-
- if (!conn)
- goto drop;
-
- BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
-
- if (!(flags & ACL_CONT)) {
- struct l2cap_hdr *hdr;
- struct sock *sk;
- u16 cid;
- int len;
-
- if (conn->rx_len) {
- BT_ERR("Unexpected start frame (len %d)", skb->len);
- kfree_skb(conn->rx_skb);
- conn->rx_skb = NULL;
- conn->rx_len = 0;
- l2cap_conn_unreliable(conn, ECOMM);
- }
-
- /* Start fragment always begin with Basic L2CAP header */
- if (skb->len < L2CAP_HDR_SIZE) {
- BT_ERR("Frame is too short (len %d)", skb->len);
- l2cap_conn_unreliable(conn, ECOMM);
- goto drop;
- }
-
- hdr = (struct l2cap_hdr *) skb->data;
- len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
- cid = __le16_to_cpu(hdr->cid);
-
- if (len == skb->len) {
- /* Complete frame received */
- l2cap_recv_frame(conn, skb);
- return 0;
- }
-
- BT_DBG("Start: total len %d, frag len %d", len, skb->len);
-
- if (skb->len > len) {
- BT_ERR("Frame is too long (len %d, expected len %d)",
- skb->len, len);
- l2cap_conn_unreliable(conn, ECOMM);
- goto drop;
- }
-
- sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
-
- if (sk && l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) {
- BT_ERR("Frame exceeding recv MTU (len %d, MTU %d)",
- len, l2cap_pi(sk)->imtu);
- bh_unlock_sock(sk);
- l2cap_conn_unreliable(conn, ECOMM);
- goto drop;
- }
-
- if (sk)
- bh_unlock_sock(sk);
-
- /* Allocate skb for the complete frame (with header) */
- conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
- if (!conn->rx_skb)
- goto drop;
-
- skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
- skb->len);
- conn->rx_len = len - skb->len;
- } else {
- BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
-
- if (!conn->rx_len) {
- BT_ERR("Unexpected continuation frame (len %d)", skb->len);
- l2cap_conn_unreliable(conn, ECOMM);
- goto drop;
- }
-
- if (skb->len > conn->rx_len) {
- BT_ERR("Fragment is too long (len %d, expected %d)",
- skb->len, conn->rx_len);
- kfree_skb(conn->rx_skb);
- conn->rx_skb = NULL;
- conn->rx_len = 0;
- l2cap_conn_unreliable(conn, ECOMM);
- goto drop;
- }
-
- skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
- skb->len);
- conn->rx_len -= skb->len;
-
- if (!conn->rx_len) {
- /* Complete frame received */
- l2cap_recv_frame(conn, conn->rx_skb);
- conn->rx_skb = NULL;
- }
- }
-
-drop:
- kfree_skb(skb);
- return 0;
-}
-
-static int l2cap_debugfs_show(struct seq_file *f, void *p)
-{
- struct sock *sk;
- struct hlist_node *node;
-
- read_lock_bh(&l2cap_sk_list.lock);
-
- sk_for_each(sk, node, &l2cap_sk_list.head) {
- struct l2cap_pinfo *pi = l2cap_pi(sk);
-
- seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
- batostr(&bt_sk(sk)->src),
- batostr(&bt_sk(sk)->dst),
- sk->sk_state, __le16_to_cpu(pi->psm),
- pi->scid, pi->dcid,
- pi->imtu, pi->omtu, pi->sec_level);
- }
-
- read_unlock_bh(&l2cap_sk_list.lock);
-
- return 0;
-}
-
-static int l2cap_debugfs_open(struct inode *inode, struct file *file)
-{
- return single_open(file, l2cap_debugfs_show, inode->i_private);
-}
-
-static const struct file_operations l2cap_debugfs_fops = {
- .open = l2cap_debugfs_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static struct dentry *l2cap_debugfs;
-
-static const struct proto_ops l2cap_sock_ops = {
- .family = PF_BLUETOOTH,
- .owner = THIS_MODULE,
- .release = l2cap_sock_release,
- .bind = l2cap_sock_bind,
- .connect = l2cap_sock_connect,
- .listen = l2cap_sock_listen,
- .accept = l2cap_sock_accept,
- .getname = l2cap_sock_getname,
- .sendmsg = l2cap_sock_sendmsg,
- .recvmsg = l2cap_sock_recvmsg,
- .poll = bt_sock_poll,
- .ioctl = bt_sock_ioctl,
- .mmap = sock_no_mmap,
- .socketpair = sock_no_socketpair,
- .shutdown = l2cap_sock_shutdown,
- .setsockopt = l2cap_sock_setsockopt,
- .getsockopt = l2cap_sock_getsockopt
-};
-
-static const struct net_proto_family l2cap_sock_family_ops = {
- .family = PF_BLUETOOTH,
- .owner = THIS_MODULE,
- .create = l2cap_sock_create,
-};
-
-static struct hci_proto l2cap_hci_proto = {
- .name = "L2CAP",
- .id = HCI_PROTO_L2CAP,
- .connect_ind = l2cap_connect_ind,
- .connect_cfm = l2cap_connect_cfm,
- .disconn_ind = l2cap_disconn_ind,
- .disconn_cfm = l2cap_disconn_cfm,
- .security_cfm = l2cap_security_cfm,
- .recv_acldata = l2cap_recv_acldata
-};
-
-static int __init l2cap_init(void)
-{
- int err;
-
- err = proto_register(&l2cap_proto, 0);
- if (err < 0)
- return err;
-
- _busy_wq = create_singlethread_workqueue("l2cap");
- if (!_busy_wq) {
- proto_unregister(&l2cap_proto);
- return -ENOMEM;
- }
-
- err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
- if (err < 0) {
- BT_ERR("L2CAP socket registration failed");
- goto error;
- }
-
- err = hci_register_proto(&l2cap_hci_proto);
- if (err < 0) {
- BT_ERR("L2CAP protocol registration failed");
- bt_sock_unregister(BTPROTO_L2CAP);
- goto error;
- }
-
- if (bt_debugfs) {
- l2cap_debugfs = debugfs_create_file("l2cap", 0444,
- bt_debugfs, NULL, &l2cap_debugfs_fops);
- if (!l2cap_debugfs)
- BT_ERR("Failed to create L2CAP debug file");
- }
-
- BT_INFO("L2CAP ver %s", VERSION);
- BT_INFO("L2CAP socket layer initialized");
-
- return 0;
-
-error:
- destroy_workqueue(_busy_wq);
- proto_unregister(&l2cap_proto);
- return err;
-}
-
-static void __exit l2cap_exit(void)
-{
- debugfs_remove(l2cap_debugfs);
-
- flush_workqueue(_busy_wq);
- destroy_workqueue(_busy_wq);
-
- if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
- BT_ERR("L2CAP socket unregistration failed");
-
- if (hci_unregister_proto(&l2cap_hci_proto) < 0)
- BT_ERR("L2CAP protocol unregistration failed");
-
- proto_unregister(&l2cap_proto);
-}
-
-void l2cap_load(void)
-{
- /* Dummy function to trigger automatic L2CAP module loading by
- * other modules that use L2CAP sockets but don't use any other
- * symbols from it. */
-}
-EXPORT_SYMBOL(l2cap_load);
-
-module_init(l2cap_init);
-module_exit(l2cap_exit);
-
-module_param(disable_ertm, bool, 0644);
-MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
-
-MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
-MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
-MODULE_VERSION(VERSION);
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("bt-proto-0");
--- /dev/null
+/*
+ BlueZ - Bluetooth protocol stack for Linux
+ Copyright (C) 2000-2001 Qualcomm Incorporated
+ Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
+ Copyright (C) 2010 Google Inc.
+
+ Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License version 2 as
+ published by the Free Software Foundation;
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+ IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
+ CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
+ COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
+ SOFTWARE IS DISCLAIMED.
+*/
+
+/* Bluetooth L2CAP core and sockets. */
+
+#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>
+
+#define VERSION "2.15"
+
+static int disable_ertm;
+
+static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
+static u8 l2cap_fixed_chan[8] = { 0x02, };
+
+static const struct proto_ops l2cap_sock_ops;
+
+static struct workqueue_struct *_busy_wq;
+
+static struct bt_sock_list l2cap_sk_list = {
+ .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
+};
+
+static void l2cap_busy_work(struct work_struct *work);
+
+static void __l2cap_sock_close(struct sock *sk, int reason);
+static void l2cap_sock_close(struct sock *sk);
+static void l2cap_sock_kill(struct sock *sk);
+
+static int l2cap_build_conf_req(struct sock *sk, void *data);
+static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
+ u8 code, u8 ident, u16 dlen, void *data);
+
+static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
+
+/* ---- L2CAP timers ---- */
+static void l2cap_sock_set_timer(struct sock *sk, long timeout)
+{
+ BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
+ sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
+}
+
+static void l2cap_sock_clear_timer(struct sock *sk)
+{
+ BT_DBG("sock %p state %d", sk, sk->sk_state);
+ sk_stop_timer(sk, &sk->sk_timer);
+}
+
+static void l2cap_sock_timeout(unsigned long arg)
+{
+ struct sock *sk = (struct sock *) arg;
+ int reason;
+
+ BT_DBG("sock %p state %d", sk, sk->sk_state);
+
+ bh_lock_sock(sk);
+
+ if (sock_owned_by_user(sk)) {
+ /* sk is owned by user. Try again later */
+ l2cap_sock_set_timer(sk, HZ / 5);
+ bh_unlock_sock(sk);
+ sock_put(sk);
+ return;
+ }
+
+ if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
+ reason = ECONNREFUSED;
+ else if (sk->sk_state == BT_CONNECT &&
+ l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
+ reason = ECONNREFUSED;
+ else
+ reason = ETIMEDOUT;
+
+ __l2cap_sock_close(sk, reason);
+
+ bh_unlock_sock(sk);
+
+ l2cap_sock_kill(sk);
+ sock_put(sk);
+}
+
+/* ---- L2CAP channels ---- */
+static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
+{
+ struct sock *s;
+ for (s = l->head; s; s = l2cap_pi(s)->next_c) {
+ if (l2cap_pi(s)->dcid == cid)
+ break;
+ }
+ return s;
+}
+
+static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
+{
+ struct sock *s;
+ for (s = l->head; s; s = l2cap_pi(s)->next_c) {
+ if (l2cap_pi(s)->scid == cid)
+ break;
+ }
+ return s;
+}
+
+/* Find channel with given SCID.
+ * Returns locked socket */
+static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
+{
+ struct sock *s;
+ read_lock(&l->lock);
+ s = __l2cap_get_chan_by_scid(l, cid);
+ if (s)
+ bh_lock_sock(s);
+ read_unlock(&l->lock);
+ return s;
+}
+
+static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
+{
+ struct sock *s;
+ for (s = l->head; s; s = l2cap_pi(s)->next_c) {
+ if (l2cap_pi(s)->ident == ident)
+ break;
+ }
+ return s;
+}
+
+static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
+{
+ struct sock *s;
+ read_lock(&l->lock);
+ s = __l2cap_get_chan_by_ident(l, ident);
+ if (s)
+ bh_lock_sock(s);
+ read_unlock(&l->lock);
+ return s;
+}
+
+static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
+{
+ u16 cid = L2CAP_CID_DYN_START;
+
+ for (; cid < L2CAP_CID_DYN_END; cid++) {
+ if (!__l2cap_get_chan_by_scid(l, cid))
+ return cid;
+ }
+
+ return 0;
+}
+
+static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
+{
+ sock_hold(sk);
+
+ if (l->head)
+ l2cap_pi(l->head)->prev_c = sk;
+
+ l2cap_pi(sk)->next_c = l->head;
+ l2cap_pi(sk)->prev_c = NULL;
+ l->head = sk;
+}
+
+static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
+{
+ struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
+
+ write_lock_bh(&l->lock);
+ if (sk == l->head)
+ l->head = next;
+
+ if (next)
+ l2cap_pi(next)->prev_c = prev;
+ if (prev)
+ l2cap_pi(prev)->next_c = next;
+ write_unlock_bh(&l->lock);
+
+ __sock_put(sk);
+}
+
+static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
+{
+ struct l2cap_chan_list *l = &conn->chan_list;
+
+ BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
+ l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
+
+ conn->disc_reason = 0x13;
+
+ l2cap_pi(sk)->conn = conn;
+
+ if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) {
+ /* Alloc CID for connection-oriented socket */
+ l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
+ } else if (sk->sk_type == SOCK_DGRAM) {
+ /* Connectionless socket */
+ l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
+ l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
+ l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
+ } else {
+ /* Raw socket can send/recv signalling messages only */
+ l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
+ l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
+ l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
+ }
+
+ __l2cap_chan_link(l, sk);
+
+ if (parent)
+ bt_accept_enqueue(parent, sk);
+}
+
+/* Delete channel.
+ * Must be called on the locked socket. */
+static void l2cap_chan_del(struct sock *sk, int err)
+{
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+ struct sock *parent = bt_sk(sk)->parent;
+
+ l2cap_sock_clear_timer(sk);
+
+ BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
+
+ if (conn) {
+ /* Unlink from channel list */
+ l2cap_chan_unlink(&conn->chan_list, sk);
+ l2cap_pi(sk)->conn = NULL;
+ hci_conn_put(conn->hcon);
+ }
+
+ sk->sk_state = BT_CLOSED;
+ sock_set_flag(sk, SOCK_ZAPPED);
+
+ if (err)
+ sk->sk_err = err;
+
+ if (parent) {
+ bt_accept_unlink(sk);
+ parent->sk_data_ready(parent, 0);
+ } else
+ sk->sk_state_change(sk);
+
+ skb_queue_purge(TX_QUEUE(sk));
+
+ if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
+ struct srej_list *l, *tmp;
+
+ del_timer(&l2cap_pi(sk)->retrans_timer);
+ del_timer(&l2cap_pi(sk)->monitor_timer);
+ del_timer(&l2cap_pi(sk)->ack_timer);
+
+ skb_queue_purge(SREJ_QUEUE(sk));
+ skb_queue_purge(BUSY_QUEUE(sk));
+
+ list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
+ list_del(&l->list);
+ kfree(l);
+ }
+ }
+}
+
+static inline u8 l2cap_get_auth_type(struct sock *sk)
+{
+ if (sk->sk_type == SOCK_RAW) {
+ switch (l2cap_pi(sk)->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 (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
+ if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
+ l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
+
+ if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
+ return HCI_AT_NO_BONDING_MITM;
+ else
+ return HCI_AT_NO_BONDING;
+ } else {
+ switch (l2cap_pi(sk)->sec_level) {
+ case BT_SECURITY_HIGH:
+ return HCI_AT_GENERAL_BONDING_MITM;
+ case BT_SECURITY_MEDIUM:
+ return HCI_AT_GENERAL_BONDING;
+ default:
+ return HCI_AT_NO_BONDING;
+ }
+ }
+}
+
+/* Service level security */
+static inline int l2cap_check_security(struct sock *sk)
+{
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+ __u8 auth_type;
+
+ auth_type = l2cap_get_auth_type(sk);
+
+ return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
+ auth_type);
+}
+
+static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
+{
+ u8 id;
+
+ /* Get next available identificator.
+ * 1 - 128 are used by kernel.
+ * 129 - 199 are reserved.
+ * 200 - 254 are used by utilities like l2ping, etc.
+ */
+
+ spin_lock_bh(&conn->lock);
+
+ if (++conn->tx_ident > 128)
+ conn->tx_ident = 1;
+
+ id = conn->tx_ident;
+
+ spin_unlock_bh(&conn->lock);
+
+ return id;
+}
+
+static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
+{
+ struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
+ u8 flags;
+
+ BT_DBG("code 0x%2.2x", code);
+
+ if (!skb)
+ return;
+
+ if (lmp_no_flush_capable(conn->hcon->hdev))
+ flags = ACL_START_NO_FLUSH;
+ else
+ flags = ACL_START;
+
+ hci_send_acl(conn->hcon, skb, flags);
+}
+
+static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
+{
+ struct sk_buff *skb;
+ struct l2cap_hdr *lh;
+ struct l2cap_conn *conn = pi->conn;
+ struct sock *sk = (struct sock *)pi;
+ int count, hlen = L2CAP_HDR_SIZE + 2;
+ u8 flags;
+
+ if (sk->sk_state != BT_CONNECTED)
+ return;
+
+ if (pi->fcs == L2CAP_FCS_CRC16)
+ hlen += 2;
+
+ BT_DBG("pi %p, control 0x%2.2x", pi, control);
+
+ count = min_t(unsigned int, conn->mtu, hlen);
+ control |= L2CAP_CTRL_FRAME_TYPE;
+
+ if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
+ control |= L2CAP_CTRL_FINAL;
+ pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
+ }
+
+ if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
+ control |= L2CAP_CTRL_POLL;
+ pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
+ }
+
+ skb = bt_skb_alloc(count, GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+ lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
+ lh->cid = cpu_to_le16(pi->dcid);
+ put_unaligned_le16(control, skb_put(skb, 2));
+
+ if (pi->fcs == L2CAP_FCS_CRC16) {
+ u16 fcs = crc16(0, (u8 *)lh, count - 2);
+ put_unaligned_le16(fcs, skb_put(skb, 2));
+ }
+
+ if (lmp_no_flush_capable(conn->hcon->hdev))
+ flags = ACL_START_NO_FLUSH;
+ else
+ flags = ACL_START;
+
+ hci_send_acl(pi->conn->hcon, skb, flags);
+}
+
+static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
+{
+ if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
+ control |= L2CAP_SUPER_RCV_NOT_READY;
+ pi->conn_state |= L2CAP_CONN_RNR_SENT;
+ } else
+ control |= L2CAP_SUPER_RCV_READY;
+
+ control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+
+ l2cap_send_sframe(pi, control);
+}
+
+static inline int __l2cap_no_conn_pending(struct sock *sk)
+{
+ return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND);
+}
+
+static void l2cap_do_start(struct sock *sk)
+{
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+
+ if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
+ if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
+ return;
+
+ if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) {
+ struct l2cap_conn_req req;
+ req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
+ req.psm = l2cap_pi(sk)->psm;
+
+ l2cap_pi(sk)->ident = l2cap_get_ident(conn);
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
+
+ l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+ L2CAP_CONN_REQ, sizeof(req), &req);
+ }
+ } else {
+ struct l2cap_info_req req;
+ req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
+
+ conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
+ conn->info_ident = l2cap_get_ident(conn);
+
+ mod_timer(&conn->info_timer, jiffies +
+ msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
+
+ l2cap_send_cmd(conn, conn->info_ident,
+ L2CAP_INFO_REQ, sizeof(req), &req);
+ }
+}
+
+static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
+{
+ u32 local_feat_mask = l2cap_feat_mask;
+ if (!disable_ertm)
+ local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
+
+ switch (mode) {
+ case L2CAP_MODE_ERTM:
+ return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
+ case L2CAP_MODE_STREAMING:
+ return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
+ default:
+ return 0x00;
+ }
+}
+
+static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err)
+{
+ struct l2cap_disconn_req req;
+
+ if (!conn)
+ return;
+
+ skb_queue_purge(TX_QUEUE(sk));
+
+ if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
+ del_timer(&l2cap_pi(sk)->retrans_timer);
+ del_timer(&l2cap_pi(sk)->monitor_timer);
+ del_timer(&l2cap_pi(sk)->ack_timer);
+ }
+
+ req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
+ l2cap_send_cmd(conn, l2cap_get_ident(conn),
+ L2CAP_DISCONN_REQ, sizeof(req), &req);
+
+ sk->sk_state = BT_DISCONN;
+ sk->sk_err = err;
+}
+
+/* ---- L2CAP connections ---- */
+static void l2cap_conn_start(struct l2cap_conn *conn)
+{
+ struct l2cap_chan_list *l = &conn->chan_list;
+ struct sock_del_list del, *tmp1, *tmp2;
+ struct sock *sk;
+
+ BT_DBG("conn %p", conn);
+
+ INIT_LIST_HEAD(&del.list);
+
+ read_lock(&l->lock);
+
+ for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+ bh_lock_sock(sk);
+
+ if (sk->sk_type != SOCK_SEQPACKET &&
+ sk->sk_type != SOCK_STREAM) {
+ bh_unlock_sock(sk);
+ continue;
+ }
+
+ if (sk->sk_state == BT_CONNECT) {
+ struct l2cap_conn_req req;
+
+ if (!l2cap_check_security(sk) ||
+ !__l2cap_no_conn_pending(sk)) {
+ bh_unlock_sock(sk);
+ continue;
+ }
+
+ if (!l2cap_mode_supported(l2cap_pi(sk)->mode,
+ conn->feat_mask)
+ && l2cap_pi(sk)->conf_state &
+ L2CAP_CONF_STATE2_DEVICE) {
+ tmp1 = kzalloc(sizeof(struct sock_del_list),
+ GFP_ATOMIC);
+ tmp1->sk = sk;
+ list_add_tail(&tmp1->list, &del.list);
+ bh_unlock_sock(sk);
+ continue;
+ }
+
+ req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
+ req.psm = l2cap_pi(sk)->psm;
+
+ l2cap_pi(sk)->ident = l2cap_get_ident(conn);
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
+
+ l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+ L2CAP_CONN_REQ, sizeof(req), &req);
+
+ } else if (sk->sk_state == BT_CONNECT2) {
+ struct l2cap_conn_rsp rsp;
+ char buf[128];
+ rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
+
+ if (l2cap_check_security(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);
+ parent->sk_data_ready(parent, 0);
+
+ } else {
+ sk->sk_state = BT_CONFIG;
+ rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
+ rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
+ }
+ } else {
+ rsp.result = cpu_to_le16(L2CAP_CR_PEND);
+ rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
+ }
+
+ l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+ L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+
+ if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT ||
+ rsp.result != L2CAP_CR_SUCCESS) {
+ bh_unlock_sock(sk);
+ continue;
+ }
+
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+ l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+ l2cap_build_conf_req(sk, buf), buf);
+ l2cap_pi(sk)->num_conf_req++;
+ }
+
+ bh_unlock_sock(sk);
+ }
+
+ read_unlock(&l->lock);
+
+ list_for_each_entry_safe(tmp1, tmp2, &del.list, list) {
+ bh_lock_sock(tmp1->sk);
+ __l2cap_sock_close(tmp1->sk, ECONNRESET);
+ bh_unlock_sock(tmp1->sk);
+ list_del(&tmp1->list);
+ kfree(tmp1);
+ }
+}
+
+static void l2cap_conn_ready(struct l2cap_conn *conn)
+{
+ struct l2cap_chan_list *l = &conn->chan_list;
+ struct sock *sk;
+
+ BT_DBG("conn %p", conn);
+
+ read_lock(&l->lock);
+
+ for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+ bh_lock_sock(sk);
+
+ if (sk->sk_type != SOCK_SEQPACKET &&
+ sk->sk_type != SOCK_STREAM) {
+ l2cap_sock_clear_timer(sk);
+ sk->sk_state = BT_CONNECTED;
+ sk->sk_state_change(sk);
+ } else if (sk->sk_state == BT_CONNECT)
+ l2cap_do_start(sk);
+
+ bh_unlock_sock(sk);
+ }
+
+ read_unlock(&l->lock);
+}
+
+/* Notify sockets that we cannot guaranty reliability anymore */
+static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
+{
+ struct l2cap_chan_list *l = &conn->chan_list;
+ struct sock *sk;
+
+ BT_DBG("conn %p", conn);
+
+ read_lock(&l->lock);
+
+ for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+ if (l2cap_pi(sk)->force_reliable)
+ sk->sk_err = err;
+ }
+
+ read_unlock(&l->lock);
+}
+
+static void l2cap_info_timeout(unsigned long arg)
+{
+ struct l2cap_conn *conn = (void *) arg;
+
+ conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+ conn->info_ident = 0;
+
+ l2cap_conn_start(conn);
+}
+
+static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
+{
+ struct l2cap_conn *conn = hcon->l2cap_data;
+
+ if (conn || status)
+ return conn;
+
+ conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
+ if (!conn)
+ return NULL;
+
+ hcon->l2cap_data = conn;
+ conn->hcon = hcon;
+
+ BT_DBG("hcon %p conn %p", hcon, conn);
+
+ conn->mtu = hcon->hdev->acl_mtu;
+ conn->src = &hcon->hdev->bdaddr;
+ conn->dst = &hcon->dst;
+
+ conn->feat_mask = 0;
+
+ spin_lock_init(&conn->lock);
+ rwlock_init(&conn->chan_list.lock);
+
+ setup_timer(&conn->info_timer, l2cap_info_timeout,
+ (unsigned long) conn);
+
+ conn->disc_reason = 0x13;
+
+ return conn;
+}
+
+static void l2cap_conn_del(struct hci_conn *hcon, int err)
+{
+ struct l2cap_conn *conn = hcon->l2cap_data;
+ struct sock *sk;
+
+ if (!conn)
+ return;
+
+ BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
+
+ kfree_skb(conn->rx_skb);
+
+ /* Kill channels */
+ while ((sk = conn->chan_list.head)) {
+ bh_lock_sock(sk);
+ l2cap_chan_del(sk, err);
+ bh_unlock_sock(sk);
+ l2cap_sock_kill(sk);
+ }
+
+ if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
+ del_timer_sync(&conn->info_timer);
+
+ hcon->l2cap_data = NULL;
+ kfree(conn);
+}
+
+static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
+{
+ struct l2cap_chan_list *l = &conn->chan_list;
+ write_lock_bh(&l->lock);
+ __l2cap_chan_add(conn, sk, parent);
+ write_unlock_bh(&l->lock);
+}
+
+/* ---- Socket interface ---- */
+static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
+{
+ struct sock *sk;
+ struct hlist_node *node;
+ sk_for_each(sk, node, &l2cap_sk_list.head)
+ if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
+ goto found;
+ sk = NULL;
+found:
+ return sk;
+}
+
+/* Find socket with psm and source bdaddr.
+ * Returns closest match.
+ */
+static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
+{
+ struct sock *sk = NULL, *sk1 = NULL;
+ struct hlist_node *node;
+
+ read_lock(&l2cap_sk_list.lock);
+
+ sk_for_each(sk, node, &l2cap_sk_list.head) {
+ if (state && sk->sk_state != state)
+ continue;
+
+ if (l2cap_pi(sk)->psm == psm) {
+ /* Exact match. */
+ if (!bacmp(&bt_sk(sk)->src, src))
+ break;
+
+ /* Closest match */
+ if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
+ sk1 = sk;
+ }
+ }
+
+ read_unlock(&l2cap_sk_list.lock);
+
+ return node ? sk : sk1;
+}
+
+static void l2cap_sock_destruct(struct sock *sk)
+{
+ BT_DBG("sk %p", sk);
+
+ skb_queue_purge(&sk->sk_receive_queue);
+ skb_queue_purge(&sk->sk_write_queue);
+}
+
+static void l2cap_sock_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)))
+ l2cap_sock_close(sk);
+
+ parent->sk_state = BT_CLOSED;
+ sock_set_flag(parent, SOCK_ZAPPED);
+}
+
+/* Kill socket (only if zapped and orphan)
+ * Must be called on unlocked socket.
+ */
+static void l2cap_sock_kill(struct sock *sk)
+{
+ if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
+ return;
+
+ BT_DBG("sk %p state %d", sk, sk->sk_state);
+
+ /* Kill poor orphan */
+ bt_sock_unlink(&l2cap_sk_list, sk);
+ sock_set_flag(sk, SOCK_DEAD);
+ sock_put(sk);
+}
+
+static void __l2cap_sock_close(struct sock *sk, int reason)
+{
+ BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
+
+ switch (sk->sk_state) {
+ case BT_LISTEN:
+ l2cap_sock_cleanup_listen(sk);
+ break;
+
+ case BT_CONNECTED:
+ case BT_CONFIG:
+ if (sk->sk_type == SOCK_SEQPACKET ||
+ sk->sk_type == SOCK_STREAM) {
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+
+ l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
+ l2cap_send_disconn_req(conn, sk, reason);
+ } else
+ l2cap_chan_del(sk, reason);
+ break;
+
+ case BT_CONNECT2:
+ if (sk->sk_type == SOCK_SEQPACKET ||
+ sk->sk_type == SOCK_STREAM) {
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+ struct l2cap_conn_rsp rsp;
+ __u16 result;
+
+ if (bt_sk(sk)->defer_setup)
+ result = L2CAP_CR_SEC_BLOCK;
+ else
+ result = L2CAP_CR_BAD_PSM;
+ sk->sk_state = BT_DISCONN;
+
+ rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
+ rsp.result = cpu_to_le16(result);
+ rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
+ l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+ L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+ } else
+ l2cap_chan_del(sk, reason);
+ break;
+
+ case BT_CONNECT:
+ case BT_DISCONN:
+ l2cap_chan_del(sk, reason);
+ break;
+
+ default:
+ sock_set_flag(sk, SOCK_ZAPPED);
+ break;
+ }
+}
+
+/* Must be called on unlocked socket. */
+static void l2cap_sock_close(struct sock *sk)
+{
+ l2cap_sock_clear_timer(sk);
+ lock_sock(sk);
+ __l2cap_sock_close(sk, ECONNRESET);
+ release_sock(sk);
+ l2cap_sock_kill(sk);
+}
+
+static void l2cap_sock_init(struct sock *sk, struct sock *parent)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+
+ BT_DBG("sk %p", sk);
+
+ if (parent) {
+ sk->sk_type = parent->sk_type;
+ bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
+
+ pi->imtu = l2cap_pi(parent)->imtu;
+ pi->omtu = l2cap_pi(parent)->omtu;
+ pi->conf_state = l2cap_pi(parent)->conf_state;
+ pi->mode = l2cap_pi(parent)->mode;
+ pi->fcs = l2cap_pi(parent)->fcs;
+ pi->max_tx = l2cap_pi(parent)->max_tx;
+ pi->tx_win = l2cap_pi(parent)->tx_win;
+ pi->sec_level = l2cap_pi(parent)->sec_level;
+ pi->role_switch = l2cap_pi(parent)->role_switch;
+ pi->force_reliable = l2cap_pi(parent)->force_reliable;
+ pi->flushable = l2cap_pi(parent)->flushable;
+ } else {
+ pi->imtu = L2CAP_DEFAULT_MTU;
+ pi->omtu = 0;
+ if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
+ pi->mode = L2CAP_MODE_ERTM;
+ pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
+ } else {
+ pi->mode = L2CAP_MODE_BASIC;
+ }
+ pi->max_tx = L2CAP_DEFAULT_MAX_TX;
+ pi->fcs = L2CAP_FCS_CRC16;
+ pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
+ pi->sec_level = BT_SECURITY_LOW;
+ pi->role_switch = 0;
+ pi->force_reliable = 0;
+ pi->flushable = BT_FLUSHABLE_OFF;
+ }
+
+ /* Default config options */
+ pi->conf_len = 0;
+ pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
+ skb_queue_head_init(TX_QUEUE(sk));
+ skb_queue_head_init(SREJ_QUEUE(sk));
+ skb_queue_head_init(BUSY_QUEUE(sk));
+ INIT_LIST_HEAD(SREJ_LIST(sk));
+}
+
+static struct proto l2cap_proto = {
+ .name = "L2CAP",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct l2cap_pinfo)
+};
+
+static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
+{
+ struct sock *sk;
+
+ sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
+ if (!sk)
+ return NULL;
+
+ sock_init_data(sock, sk);
+ INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
+
+ sk->sk_destruct = l2cap_sock_destruct;
+ sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
+
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+ sk->sk_protocol = proto;
+ sk->sk_state = BT_OPEN;
+
+ setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
+
+ bt_sock_link(&l2cap_sk_list, sk);
+ return sk;
+}
+
+static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct sock *sk;
+
+ BT_DBG("sock %p", sock);
+
+ sock->state = SS_UNCONNECTED;
+
+ if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
+ sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
+ return -ESOCKTNOSUPPORT;
+
+ if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
+ return -EPERM;
+
+ sock->ops = &l2cap_sock_ops;
+
+ sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
+ if (!sk)
+ return -ENOMEM;
+
+ l2cap_sock_init(sk, NULL);
+ return 0;
+}
+
+static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
+{
+ struct sock *sk = sock->sk;
+ struct sockaddr_l2 la;
+ int len, err = 0;
+
+ BT_DBG("sk %p", sk);
+
+ if (!addr || addr->sa_family != AF_BLUETOOTH)
+ return -EINVAL;
+
+ memset(&la, 0, sizeof(la));
+ len = min_t(unsigned int, sizeof(la), alen);
+ memcpy(&la, addr, len);
+
+ if (la.l2_cid)
+ return -EINVAL;
+
+ lock_sock(sk);
+
+ if (sk->sk_state != BT_OPEN) {
+ err = -EBADFD;
+ goto done;
+ }
+
+ if (la.l2_psm) {
+ __u16 psm = __le16_to_cpu(la.l2_psm);
+
+ /* PSM must be odd and lsb of upper byte must be 0 */
+ if ((psm & 0x0101) != 0x0001) {
+ err = -EINVAL;
+ goto done;
+ }
+
+ /* Restrict usage of well-known PSMs */
+ if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
+ err = -EACCES;
+ goto done;
+ }
+ }
+
+ write_lock_bh(&l2cap_sk_list.lock);
+
+ if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
+ err = -EADDRINUSE;
+ } else {
+ /* Save source address */
+ bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
+ l2cap_pi(sk)->psm = la.l2_psm;
+ l2cap_pi(sk)->sport = la.l2_psm;
+ sk->sk_state = BT_BOUND;
+
+ if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
+ __le16_to_cpu(la.l2_psm) == 0x0003)
+ l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
+ }
+
+ write_unlock_bh(&l2cap_sk_list.lock);
+
+done:
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_do_connect(struct sock *sk)
+{
+ bdaddr_t *src = &bt_sk(sk)->src;
+ bdaddr_t *dst = &bt_sk(sk)->dst;
+ struct l2cap_conn *conn;
+ struct hci_conn *hcon;
+ struct hci_dev *hdev;
+ __u8 auth_type;
+ int err;
+
+ BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
+ l2cap_pi(sk)->psm);
+
+ hdev = hci_get_route(dst, src);
+ if (!hdev)
+ return -EHOSTUNREACH;
+
+ hci_dev_lock_bh(hdev);
+
+ err = -ENOMEM;
+
+ auth_type = l2cap_get_auth_type(sk);
+
+ hcon = hci_connect(hdev, ACL_LINK, dst,
+ l2cap_pi(sk)->sec_level, auth_type);
+ if (!hcon)
+ goto done;
+
+ conn = l2cap_conn_add(hcon, 0);
+ if (!conn) {
+ hci_conn_put(hcon);
+ goto done;
+ }
+
+ err = 0;
+
+ /* Update source addr of the socket */
+ bacpy(src, conn->src);
+
+ l2cap_chan_add(conn, sk, NULL);
+
+ sk->sk_state = BT_CONNECT;
+ l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
+
+ if (hcon->state == BT_CONNECTED) {
+ if (sk->sk_type != SOCK_SEQPACKET &&
+ sk->sk_type != SOCK_STREAM) {
+ l2cap_sock_clear_timer(sk);
+ if (l2cap_check_security(sk))
+ sk->sk_state = BT_CONNECTED;
+ } else
+ l2cap_do_start(sk);
+ }
+
+done:
+ hci_dev_unlock_bh(hdev);
+ hci_dev_put(hdev);
+ return err;
+}
+
+static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
+{
+ struct sock *sk = sock->sk;
+ struct sockaddr_l2 la;
+ int len, err = 0;
+
+ BT_DBG("sk %p", sk);
+
+ if (!addr || alen < sizeof(addr->sa_family) ||
+ addr->sa_family != AF_BLUETOOTH)
+ return -EINVAL;
+
+ memset(&la, 0, sizeof(la));
+ len = min_t(unsigned int, sizeof(la), alen);
+ memcpy(&la, addr, len);
+
+ if (la.l2_cid)
+ return -EINVAL;
+
+ lock_sock(sk);
+
+ if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM)
+ && !la.l2_psm) {
+ err = -EINVAL;
+ goto done;
+ }
+
+ switch (l2cap_pi(sk)->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;
+ }
+
+ switch (sk->sk_state) {
+ case BT_CONNECT:
+ case BT_CONNECT2:
+ case BT_CONFIG:
+ /* Already connecting */
+ goto wait;
+
+ case BT_CONNECTED:
+ /* Already connected */
+ err = -EISCONN;
+ goto done;
+
+ case BT_OPEN:
+ case BT_BOUND:
+ /* Can connect */
+ break;
+
+ default:
+ err = -EBADFD;
+ goto done;
+ }
+
+ /* PSM must be odd and lsb of upper byte must be 0 */
+ if ((__le16_to_cpu(la.l2_psm) & 0x0101) != 0x0001 &&
+ sk->sk_type != SOCK_RAW) {
+ err = -EINVAL;
+ goto done;
+ }
+
+ /* Set destination address and psm */
+ bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
+ l2cap_pi(sk)->psm = la.l2_psm;
+
+ err = l2cap_do_connect(sk);
+ if (err)
+ goto done;
+
+wait:
+ err = bt_sock_wait_state(sk, BT_CONNECTED,
+ sock_sndtimeo(sk, flags & O_NONBLOCK));
+done:
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_sock_listen(struct socket *sock, int backlog)
+{
+ struct sock *sk = sock->sk;
+ int err = 0;
+
+ BT_DBG("sk %p backlog %d", sk, backlog);
+
+ lock_sock(sk);
+
+ if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
+ || sk->sk_state != BT_BOUND) {
+ err = -EBADFD;
+ goto done;
+ }
+
+ switch (l2cap_pi(sk)->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;
+ }
+
+ if (!l2cap_pi(sk)->psm) {
+ bdaddr_t *src = &bt_sk(sk)->src;
+ u16 psm;
+
+ err = -EINVAL;
+
+ write_lock_bh(&l2cap_sk_list.lock);
+
+ for (psm = 0x1001; psm < 0x1100; psm += 2)
+ if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
+ l2cap_pi(sk)->psm = cpu_to_le16(psm);
+ l2cap_pi(sk)->sport = cpu_to_le16(psm);
+ err = 0;
+ break;
+ }
+
+ write_unlock_bh(&l2cap_sk_list.lock);
+
+ if (err < 0)
+ goto done;
+ }
+
+ sk->sk_max_ack_backlog = backlog;
+ sk->sk_ack_backlog = 0;
+ sk->sk_state = BT_LISTEN;
+
+done:
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ struct sock *sk = sock->sk, *nsk;
+ long timeo;
+ int err = 0;
+
+ lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
+
+ if (sk->sk_state != BT_LISTEN) {
+ err = -EBADFD;
+ goto done;
+ }
+
+ timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
+
+ BT_DBG("sk %p timeo %ld", sk, timeo);
+
+ /* Wait for an incoming connection. (wake-one). */
+ add_wait_queue_exclusive(sk_sleep(sk), &wait);
+ while (!(nsk = bt_accept_dequeue(sk, newsock))) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!timeo) {
+ err = -EAGAIN;
+ break;
+ }
+
+ release_sock(sk);
+ timeo = schedule_timeout(timeo);
+ lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
+
+ if (sk->sk_state != BT_LISTEN) {
+ err = -EBADFD;
+ break;
+ }
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeo);
+ break;
+ }
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(sk_sleep(sk), &wait);
+
+ if (err)
+ goto done;
+
+ newsock->state = SS_CONNECTED;
+
+ BT_DBG("new socket %p", nsk);
+
+done:
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
+{
+ struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
+ struct sock *sk = sock->sk;
+
+ BT_DBG("sock %p, sk %p", sock, sk);
+
+ addr->sa_family = AF_BLUETOOTH;
+ *len = sizeof(struct sockaddr_l2);
+
+ if (peer) {
+ la->l2_psm = l2cap_pi(sk)->psm;
+ bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
+ la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ } else {
+ la->l2_psm = l2cap_pi(sk)->sport;
+ bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
+ la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
+ }
+
+ return 0;
+}
+
+static int __l2cap_wait_ack(struct sock *sk)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ int err = 0;
+ int timeo = HZ/5;
+
+ add_wait_queue(sk_sleep(sk), &wait);
+ while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ if (!timeo)
+ timeo = HZ/5;
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeo);
+ break;
+ }
+
+ release_sock(sk);
+ timeo = schedule_timeout(timeo);
+ lock_sock(sk);
+
+ err = sock_error(sk);
+ if (err)
+ break;
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(sk_sleep(sk), &wait);
+ return err;
+}
+
+static void l2cap_monitor_timeout(unsigned long arg)
+{
+ struct sock *sk = (void *) arg;
+
+ BT_DBG("sk %p", sk);
+
+ bh_lock_sock(sk);
+ if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
+ l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED);
+ bh_unlock_sock(sk);
+ return;
+ }
+
+ l2cap_pi(sk)->retry_count++;
+ __mod_monitor_timer();
+
+ l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
+ bh_unlock_sock(sk);
+}
+
+static void l2cap_retrans_timeout(unsigned long arg)
+{
+ struct sock *sk = (void *) arg;
+
+ BT_DBG("sk %p", sk);
+
+ bh_lock_sock(sk);
+ l2cap_pi(sk)->retry_count = 1;
+ __mod_monitor_timer();
+
+ l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
+
+ l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
+ bh_unlock_sock(sk);
+}
+
+static void l2cap_drop_acked_frames(struct sock *sk)
+{
+ struct sk_buff *skb;
+
+ while ((skb = skb_peek(TX_QUEUE(sk))) &&
+ l2cap_pi(sk)->unacked_frames) {
+ if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
+ break;
+
+ skb = skb_dequeue(TX_QUEUE(sk));
+ kfree_skb(skb);
+
+ l2cap_pi(sk)->unacked_frames--;
+ }
+
+ if (!l2cap_pi(sk)->unacked_frames)
+ del_timer(&l2cap_pi(sk)->retrans_timer);
+}
+
+static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct hci_conn *hcon = pi->conn->hcon;
+ u16 flags;
+
+ BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
+
+ if (!pi->flushable && lmp_no_flush_capable(hcon->hdev))
+ flags = ACL_START_NO_FLUSH;
+ else
+ flags = ACL_START;
+
+ hci_send_acl(hcon, skb, flags);
+}
+
+static void l2cap_streaming_send(struct sock *sk)
+{
+ struct sk_buff *skb;
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ u16 control, fcs;
+
+ while ((skb = skb_dequeue(TX_QUEUE(sk)))) {
+ control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
+ control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
+ put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
+
+ if (pi->fcs == L2CAP_FCS_CRC16) {
+ fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
+ put_unaligned_le16(fcs, skb->data + skb->len - 2);
+ }
+
+ l2cap_do_send(sk, skb);
+
+ pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
+ }
+}
+
+static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct sk_buff *skb, *tx_skb;
+ u16 control, fcs;
+
+ skb = skb_peek(TX_QUEUE(sk));
+ if (!skb)
+ return;
+
+ do {
+ if (bt_cb(skb)->tx_seq == tx_seq)
+ break;
+
+ if (skb_queue_is_last(TX_QUEUE(sk), skb))
+ return;
+
+ } while ((skb = skb_queue_next(TX_QUEUE(sk), skb)));
+
+ if (pi->remote_max_tx &&
+ bt_cb(skb)->retries == pi->remote_max_tx) {
+ l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
+ return;
+ }
+
+ tx_skb = skb_clone(skb, GFP_ATOMIC);
+ bt_cb(skb)->retries++;
+ control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
+
+ if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
+ control |= L2CAP_CTRL_FINAL;
+ pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
+ }
+
+ control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
+ | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
+
+ put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
+
+ if (pi->fcs == L2CAP_FCS_CRC16) {
+ fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
+ put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
+ }
+
+ l2cap_do_send(sk, tx_skb);
+}
+
+static int l2cap_ertm_send(struct sock *sk)
+{
+ struct sk_buff *skb, *tx_skb;
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ u16 control, fcs;
+ int nsent = 0;
+
+ if (sk->sk_state != BT_CONNECTED)
+ return -ENOTCONN;
+
+ while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) {
+
+ if (pi->remote_max_tx &&
+ bt_cb(skb)->retries == pi->remote_max_tx) {
+ l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
+ break;
+ }
+
+ tx_skb = skb_clone(skb, GFP_ATOMIC);
+
+ bt_cb(skb)->retries++;
+
+ control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
+ control &= L2CAP_CTRL_SAR;
+
+ if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
+ control |= L2CAP_CTRL_FINAL;
+ pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
+ }
+ control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
+ | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
+ put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
+
+
+ if (pi->fcs == L2CAP_FCS_CRC16) {
+ fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
+ put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
+ }
+
+ l2cap_do_send(sk, tx_skb);
+
+ __mod_retrans_timer();
+
+ bt_cb(skb)->tx_seq = pi->next_tx_seq;
+ pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
+
+ pi->unacked_frames++;
+ pi->frames_sent++;
+
+ if (skb_queue_is_last(TX_QUEUE(sk), skb))
+ sk->sk_send_head = NULL;
+ else
+ sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
+
+ nsent++;
+ }
+
+ return nsent;
+}
+
+static int l2cap_retransmit_frames(struct sock *sk)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ int ret;
+
+ if (!skb_queue_empty(TX_QUEUE(sk)))
+ sk->sk_send_head = TX_QUEUE(sk)->next;
+
+ pi->next_tx_seq = pi->expected_ack_seq;
+ ret = l2cap_ertm_send(sk);
+ return ret;
+}
+
+static void l2cap_send_ack(struct l2cap_pinfo *pi)
+{
+ struct sock *sk = (struct sock *)pi;
+ u16 control = 0;
+
+ control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+
+ if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
+ control |= L2CAP_SUPER_RCV_NOT_READY;
+ pi->conn_state |= L2CAP_CONN_RNR_SENT;
+ l2cap_send_sframe(pi, control);
+ return;
+ }
+
+ if (l2cap_ertm_send(sk) > 0)
+ return;
+
+ control |= L2CAP_SUPER_RCV_READY;
+ l2cap_send_sframe(pi, control);
+}
+
+static void l2cap_send_srejtail(struct sock *sk)
+{
+ struct srej_list *tail;
+ u16 control;
+
+ control = L2CAP_SUPER_SELECT_REJECT;
+ control |= L2CAP_CTRL_FINAL;
+
+ tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list);
+ control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+
+ l2cap_send_sframe(l2cap_pi(sk), control);
+}
+
+static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
+{
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+ struct sk_buff **frag;
+ int err, sent = 0;
+
+ if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
+ return -EFAULT;
+
+ sent += count;
+ len -= count;
+
+ /* Continuation fragments (no L2CAP header) */
+ frag = &skb_shinfo(skb)->frag_list;
+ while (len) {
+ count = min_t(unsigned int, conn->mtu, len);
+
+ *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
+ if (!*frag)
+ return err;
+ if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
+ return -EFAULT;
+
+ sent += count;
+ len -= count;
+
+ frag = &(*frag)->next;
+ }
+
+ return sent;
+}
+
+static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len)
+{
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+ struct sk_buff *skb;
+ int err, count, hlen = L2CAP_HDR_SIZE + 2;
+ struct l2cap_hdr *lh;
+
+ BT_DBG("sk %p len %d", sk, (int)len);
+
+ count = min_t(unsigned int, (conn->mtu - hlen), len);
+ skb = bt_skb_send_alloc(sk, count + hlen,
+ msg->msg_flags & MSG_DONTWAIT, &err);
+ if (!skb)
+ return ERR_PTR(err);
+
+ /* Create L2CAP header */
+ lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+ lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
+ put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2));
+
+ err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
+ if (unlikely(err < 0)) {
+ kfree_skb(skb);
+ return ERR_PTR(err);
+ }
+ return skb;
+}
+
+static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len)
+{
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+ struct sk_buff *skb;
+ int err, count, hlen = L2CAP_HDR_SIZE;
+ struct l2cap_hdr *lh;
+
+ BT_DBG("sk %p len %d", sk, (int)len);
+
+ count = min_t(unsigned int, (conn->mtu - hlen), len);
+ skb = bt_skb_send_alloc(sk, count + hlen,
+ msg->msg_flags & MSG_DONTWAIT, &err);
+ if (!skb)
+ return ERR_PTR(err);
+
+ /* Create L2CAP header */
+ lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+ lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
+
+ err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
+ if (unlikely(err < 0)) {
+ kfree_skb(skb);
+ return ERR_PTR(err);
+ }
+ return skb;
+}
+
+static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
+{
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+ struct sk_buff *skb;
+ int err, count, hlen = L2CAP_HDR_SIZE + 2;
+ struct l2cap_hdr *lh;
+
+ BT_DBG("sk %p len %d", sk, (int)len);
+
+ if (!conn)
+ return ERR_PTR(-ENOTCONN);
+
+ if (sdulen)
+ hlen += 2;
+
+ if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
+ hlen += 2;
+
+ count = min_t(unsigned int, (conn->mtu - hlen), len);
+ skb = bt_skb_send_alloc(sk, count + hlen,
+ msg->msg_flags & MSG_DONTWAIT, &err);
+ if (!skb)
+ return ERR_PTR(err);
+
+ /* Create L2CAP header */
+ lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+ lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
+ put_unaligned_le16(control, skb_put(skb, 2));
+ if (sdulen)
+ put_unaligned_le16(sdulen, skb_put(skb, 2));
+
+ err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
+ if (unlikely(err < 0)) {
+ kfree_skb(skb);
+ return ERR_PTR(err);
+ }
+
+ if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
+ put_unaligned_le16(0, skb_put(skb, 2));
+
+ bt_cb(skb)->retries = 0;
+ return skb;
+}
+
+static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct sk_buff *skb;
+ struct sk_buff_head sar_queue;
+ u16 control;
+ size_t size = 0;
+
+ skb_queue_head_init(&sar_queue);
+ control = L2CAP_SDU_START;
+ skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len);
+ if (IS_ERR(skb))
+ return PTR_ERR(skb);
+
+ __skb_queue_tail(&sar_queue, skb);
+ len -= pi->remote_mps;
+ size += pi->remote_mps;
+
+ while (len > 0) {
+ size_t buflen;
+
+ if (len > pi->remote_mps) {
+ control = L2CAP_SDU_CONTINUE;
+ buflen = pi->remote_mps;
+ } else {
+ control = L2CAP_SDU_END;
+ buflen = len;
+ }
+
+ skb = l2cap_create_iframe_pdu(sk, 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, TX_QUEUE(sk));
+ if (sk->sk_send_head == NULL)
+ sk->sk_send_head = sar_queue.next;
+
+ return size;
+}
+
+static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
+{
+ struct sock *sk = sock->sk;
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct sk_buff *skb;
+ u16 control;
+ int err;
+
+ BT_DBG("sock %p, sk %p", sock, sk);
+
+ err = sock_error(sk);
+ if (err)
+ return err;
+
+ if (msg->msg_flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ lock_sock(sk);
+
+ if (sk->sk_state != BT_CONNECTED) {
+ err = -ENOTCONN;
+ goto done;
+ }
+
+ /* Connectionless channel */
+ if (sk->sk_type == SOCK_DGRAM) {
+ skb = l2cap_create_connless_pdu(sk, msg, len);
+ if (IS_ERR(skb)) {
+ err = PTR_ERR(skb);
+ } else {
+ l2cap_do_send(sk, skb);
+ err = len;
+ }
+ goto done;
+ }
+
+ switch (pi->mode) {
+ case L2CAP_MODE_BASIC:
+ /* Check outgoing MTU */
+ if (len > pi->omtu) {
+ err = -EMSGSIZE;
+ goto done;
+ }
+
+ /* Create a basic PDU */
+ skb = l2cap_create_basic_pdu(sk, msg, len);
+ if (IS_ERR(skb)) {
+ err = PTR_ERR(skb);
+ goto done;
+ }
+
+ l2cap_do_send(sk, skb);
+ err = len;
+ break;
+
+ case L2CAP_MODE_ERTM:
+ case L2CAP_MODE_STREAMING:
+ /* Entire SDU fits into one PDU */
+ if (len <= pi->remote_mps) {
+ control = L2CAP_SDU_UNSEGMENTED;
+ skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
+ if (IS_ERR(skb)) {
+ err = PTR_ERR(skb);
+ goto done;
+ }
+ __skb_queue_tail(TX_QUEUE(sk), skb);
+
+ if (sk->sk_send_head == NULL)
+ sk->sk_send_head = skb;
+
+ } else {
+ /* Segment SDU into multiples PDUs */
+ err = l2cap_sar_segment_sdu(sk, msg, len);
+ if (err < 0)
+ goto done;
+ }
+
+ if (pi->mode == L2CAP_MODE_STREAMING) {
+ l2cap_streaming_send(sk);
+ } else {
+ if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
+ (pi->conn_state & L2CAP_CONN_WAIT_F)) {
+ err = len;
+ break;
+ }
+ err = l2cap_ertm_send(sk);
+ }
+
+ if (err >= 0)
+ err = len;
+ break;
+
+ default:
+ BT_DBG("bad state %1.1x", pi->mode);
+ err = -EBADFD;
+ }
+
+done:
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
+{
+ struct sock *sk = sock->sk;
+
+ lock_sock(sk);
+
+ if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
+ struct l2cap_conn_rsp rsp;
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+ u8 buf[128];
+
+ sk->sk_state = BT_CONFIG;
+
+ rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
+ rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
+ rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
+ l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
+ L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+
+ if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) {
+ release_sock(sk);
+ return 0;
+ }
+
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+ l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+ l2cap_build_conf_req(sk, buf), buf);
+ l2cap_pi(sk)->num_conf_req++;
+
+ release_sock(sk);
+ return 0;
+ }
+
+ release_sock(sk);
+
+ if (sock->type == SOCK_STREAM)
+ return bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
+
+ return bt_sock_recvmsg(iocb, sock, msg, len, flags);
+}
+
+static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
+{
+ struct sock *sk = sock->sk;
+ struct l2cap_options opts;
+ int len, err = 0;
+ u32 opt;
+
+ BT_DBG("sk %p", sk);
+
+ lock_sock(sk);
+
+ switch (optname) {
+ case L2CAP_OPTIONS:
+ if (sk->sk_state == BT_CONNECTED) {
+ err = -EINVAL;
+ break;
+ }
+
+ opts.imtu = l2cap_pi(sk)->imtu;
+ opts.omtu = l2cap_pi(sk)->omtu;
+ opts.flush_to = l2cap_pi(sk)->flush_to;
+ opts.mode = l2cap_pi(sk)->mode;
+ opts.fcs = l2cap_pi(sk)->fcs;
+ opts.max_tx = l2cap_pi(sk)->max_tx;
+ opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
+
+ len = min_t(unsigned int, sizeof(opts), optlen);
+ if (copy_from_user((char *) &opts, optval, len)) {
+ err = -EFAULT;
+ break;
+ }
+
+ if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
+ err = -EINVAL;
+ break;
+ }
+
+ l2cap_pi(sk)->mode = opts.mode;
+ switch (l2cap_pi(sk)->mode) {
+ case L2CAP_MODE_BASIC:
+ l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE;
+ break;
+ case L2CAP_MODE_ERTM:
+ case L2CAP_MODE_STREAMING:
+ if (!disable_ertm)
+ break;
+ /* fall through */
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ l2cap_pi(sk)->imtu = opts.imtu;
+ l2cap_pi(sk)->omtu = opts.omtu;
+ l2cap_pi(sk)->fcs = opts.fcs;
+ l2cap_pi(sk)->max_tx = opts.max_tx;
+ l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size;
+ break;
+
+ case L2CAP_LM:
+ if (get_user(opt, (u32 __user *) optval)) {
+ err = -EFAULT;
+ break;
+ }
+
+ if (opt & L2CAP_LM_AUTH)
+ l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
+ if (opt & L2CAP_LM_ENCRYPT)
+ l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
+ if (opt & L2CAP_LM_SECURE)
+ l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
+
+ l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
+ l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
+ break;
+
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
+{
+ struct sock *sk = sock->sk;
+ struct bt_security sec;
+ int len, err = 0;
+ u32 opt;
+
+ BT_DBG("sk %p", sk);
+
+ if (level == SOL_L2CAP)
+ return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
+
+ if (level != SOL_BLUETOOTH)
+ return -ENOPROTOOPT;
+
+ lock_sock(sk);
+
+ switch (optname) {
+ case BT_SECURITY:
+ if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
+ && sk->sk_type != SOCK_RAW) {
+ err = -EINVAL;
+ break;
+ }
+
+ sec.level = BT_SECURITY_LOW;
+
+ len = min_t(unsigned int, sizeof(sec), optlen);
+ if (copy_from_user((char *) &sec, optval, len)) {
+ err = -EFAULT;
+ break;
+ }
+
+ if (sec.level < BT_SECURITY_LOW ||
+ sec.level > BT_SECURITY_HIGH) {
+ err = -EINVAL;
+ break;
+ }
+
+ l2cap_pi(sk)->sec_level = sec.level;
+ break;
+
+ case BT_DEFER_SETUP:
+ if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
+ err = -EINVAL;
+ break;
+ }
+
+ if (get_user(opt, (u32 __user *) optval)) {
+ err = -EFAULT;
+ break;
+ }
+
+ bt_sk(sk)->defer_setup = opt;
+ break;
+
+ case BT_FLUSHABLE:
+ if (get_user(opt, (u32 __user *) optval)) {
+ err = -EFAULT;
+ break;
+ }
+
+ if (opt > BT_FLUSHABLE_ON) {
+ err = -EINVAL;
+ break;
+ }
+
+ if (opt == BT_FLUSHABLE_OFF) {
+ struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+ /* proceed futher only when we have l2cap_conn and
+ No Flush support in the LM */
+ if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
+ err = -EINVAL;
+ break;
+ }
+ }
+
+ l2cap_pi(sk)->flushable = opt;
+ break;
+
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
+{
+ struct sock *sk = sock->sk;
+ struct l2cap_options opts;
+ struct l2cap_conninfo cinfo;
+ int len, err = 0;
+ u32 opt;
+
+ BT_DBG("sk %p", sk);
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ lock_sock(sk);
+
+ switch (optname) {
+ case L2CAP_OPTIONS:
+ opts.imtu = l2cap_pi(sk)->imtu;
+ opts.omtu = l2cap_pi(sk)->omtu;
+ opts.flush_to = l2cap_pi(sk)->flush_to;
+ opts.mode = l2cap_pi(sk)->mode;
+ opts.fcs = l2cap_pi(sk)->fcs;
+ opts.max_tx = l2cap_pi(sk)->max_tx;
+ opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
+
+ len = min_t(unsigned int, len, sizeof(opts));
+ if (copy_to_user(optval, (char *) &opts, len))
+ err = -EFAULT;
+
+ break;
+
+ case L2CAP_LM:
+ switch (l2cap_pi(sk)->sec_level) {
+ case BT_SECURITY_LOW:
+ opt = L2CAP_LM_AUTH;
+ break;
+ case BT_SECURITY_MEDIUM:
+ opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
+ break;
+ case BT_SECURITY_HIGH:
+ opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
+ L2CAP_LM_SECURE;
+ break;
+ default:
+ opt = 0;
+ break;
+ }
+
+ if (l2cap_pi(sk)->role_switch)
+ opt |= L2CAP_LM_MASTER;
+
+ if (l2cap_pi(sk)->force_reliable)
+ opt |= L2CAP_LM_RELIABLE;
+
+ if (put_user(opt, (u32 __user *) optval))
+ err = -EFAULT;
+ break;
+
+ case L2CAP_CONNINFO:
+ if (sk->sk_state != BT_CONNECTED &&
+ !(sk->sk_state == BT_CONNECT2 &&
+ bt_sk(sk)->defer_setup)) {
+ err = -ENOTCONN;
+ break;
+ }
+
+ cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
+ memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
+
+ len = min_t(unsigned int, len, sizeof(cinfo));
+ if (copy_to_user(optval, (char *) &cinfo, len))
+ err = -EFAULT;
+
+ break;
+
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
+{
+ struct sock *sk = sock->sk;
+ struct bt_security sec;
+ int len, err = 0;
+
+ BT_DBG("sk %p", sk);
+
+ if (level == SOL_L2CAP)
+ return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
+
+ if (level != SOL_BLUETOOTH)
+ return -ENOPROTOOPT;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ lock_sock(sk);
+
+ switch (optname) {
+ case BT_SECURITY:
+ if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
+ && sk->sk_type != SOCK_RAW) {
+ err = -EINVAL;
+ break;
+ }
+
+ sec.level = l2cap_pi(sk)->sec_level;
+
+ len = min_t(unsigned int, len, sizeof(sec));
+ if (copy_to_user(optval, (char *) &sec, len))
+ err = -EFAULT;
+
+ break;
+
+ case BT_DEFER_SETUP:
+ if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
+ err = -EINVAL;
+ break;
+ }
+
+ if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
+ err = -EFAULT;
+
+ break;
+
+ case BT_FLUSHABLE:
+ if (put_user(l2cap_pi(sk)->flushable, (u32 __user *) optval))
+ err = -EFAULT;
+
+ break;
+
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_sock_shutdown(struct socket *sock, int how)
+{
+ struct sock *sk = sock->sk;
+ int err = 0;
+
+ BT_DBG("sock %p, sk %p", sock, sk);
+
+ if (!sk)
+ return 0;
+
+ lock_sock(sk);
+ if (!sk->sk_shutdown) {
+ if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
+ err = __l2cap_wait_ack(sk);
+
+ sk->sk_shutdown = SHUTDOWN_MASK;
+ l2cap_sock_clear_timer(sk);
+ __l2cap_sock_close(sk, 0);
+
+ if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
+ err = bt_sock_wait_state(sk, BT_CLOSED,
+ sk->sk_lingertime);
+ }
+
+ if (!err && sk->sk_err)
+ err = -sk->sk_err;
+
+ release_sock(sk);
+ return err;
+}
+
+static int l2cap_sock_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ int err;
+
+ BT_DBG("sock %p, sk %p", sock, sk);
+
+ if (!sk)
+ return 0;
+
+ err = l2cap_sock_shutdown(sock, 2);
+
+ sock_orphan(sk);
+ l2cap_sock_kill(sk);
+ return err;
+}
+
+static void l2cap_chan_ready(struct sock *sk)
+{
+ struct sock *parent = bt_sk(sk)->parent;
+
+ BT_DBG("sk %p, parent %p", sk, parent);
+
+ l2cap_pi(sk)->conf_state = 0;
+ l2cap_sock_clear_timer(sk);
+
+ if (!parent) {
+ /* Outgoing channel.
+ * Wake up socket sleeping on connect.
+ */
+ sk->sk_state = BT_CONNECTED;
+ sk->sk_state_change(sk);
+ } else {
+ /* Incoming channel.
+ * Wake up socket sleeping on accept.
+ */
+ parent->sk_data_ready(parent, 0);
+ }
+}
+
+/* Copy frame to all raw sockets on that connection */
+static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
+{
+ struct l2cap_chan_list *l = &conn->chan_list;
+ struct sk_buff *nskb;
+ struct sock *sk;
+
+ BT_DBG("conn %p", conn);
+
+ read_lock(&l->lock);
+ for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+ if (sk->sk_type != SOCK_RAW)
+ continue;
+
+ /* Don't send frame to the socket it came from */
+ if (skb->sk == sk)
+ continue;
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (!nskb)
+ continue;
+
+ if (sock_queue_rcv_skb(sk, nskb))
+ kfree_skb(nskb);
+ }
+ read_unlock(&l->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);
+ lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
+
+ cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
+ cmd->code = code;
+ cmd->ident = ident;
+ cmd->len = cpu_to_le16(dlen);
+
+ if (dlen) {
+ count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
+ memcpy(skb_put(skb, count), data, count);
+ data += count;
+ }
+
+ len -= skb->len;
+
+ /* Continuation fragments (no L2CAP header) */
+ frag = &skb_shinfo(skb)->frag_list;
+ while (len) {
+ count = min_t(unsigned int, conn->mtu, len);
+
+ *frag = bt_skb_alloc(count, GFP_ATOMIC);
+ if (!*frag)
+ goto fail;
+
+ memcpy(skb_put(*frag, count), data, count);
+
+ len -= count;
+ data += count;
+
+ frag = &(*frag)->next;
+ }
+
+ return skb;
+
+fail:
+ kfree_skb(skb);
+ return NULL;
+}
+
+static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
+{
+ struct l2cap_conf_opt *opt = *ptr;
+ int len;
+
+ len = L2CAP_CONF_OPT_SIZE + opt->len;
+ *ptr += len;
+
+ *type = opt->type;
+ *olen = opt->len;
+
+ switch (opt->len) {
+ case 1:
+ *val = *((u8 *) opt->val);
+ break;
+
+ case 2:
+ *val = get_unaligned_le16(opt->val);
+ break;
+
+ case 4:
+ *val = get_unaligned_le32(opt->val);
+ break;
+
+ default:
+ *val = (unsigned long) opt->val;
+ break;
+ }
+
+ BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
+ return len;
+}
+
+static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
+{
+ struct l2cap_conf_opt *opt = *ptr;
+
+ BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
+
+ opt->type = type;
+ opt->len = len;
+
+ switch (len) {
+ case 1:
+ *((u8 *) opt->val) = val;
+ break;
+
+ case 2:
+ put_unaligned_le16(val, opt->val);
+ break;
+
+ case 4:
+ put_unaligned_le32(val, opt->val);
+ break;
+
+ default:
+ memcpy(opt->val, (void *) val, len);
+ break;
+ }
+
+ *ptr += L2CAP_CONF_OPT_SIZE + len;
+}
+
+static void l2cap_ack_timeout(unsigned long arg)
+{
+ struct sock *sk = (void *) arg;
+
+ bh_lock_sock(sk);
+ l2cap_send_ack(l2cap_pi(sk));
+ bh_unlock_sock(sk);
+}
+
+static inline void l2cap_ertm_init(struct sock *sk)
+{
+ l2cap_pi(sk)->expected_ack_seq = 0;
+ l2cap_pi(sk)->unacked_frames = 0;
+ l2cap_pi(sk)->buffer_seq = 0;
+ l2cap_pi(sk)->num_acked = 0;
+ l2cap_pi(sk)->frames_sent = 0;
+
+ setup_timer(&l2cap_pi(sk)->retrans_timer,
+ l2cap_retrans_timeout, (unsigned long) sk);
+ setup_timer(&l2cap_pi(sk)->monitor_timer,
+ l2cap_monitor_timeout, (unsigned long) sk);
+ setup_timer(&l2cap_pi(sk)->ack_timer,
+ l2cap_ack_timeout, (unsigned long) sk);
+
+ __skb_queue_head_init(SREJ_QUEUE(sk));
+ __skb_queue_head_init(BUSY_QUEUE(sk));
+
+ INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work);
+
+ sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
+}
+
+static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
+{
+ switch (mode) {
+ case L2CAP_MODE_STREAMING:
+ case L2CAP_MODE_ERTM:
+ if (l2cap_mode_supported(mode, remote_feat_mask))
+ return mode;
+ /* fall through */
+ default:
+ return L2CAP_MODE_BASIC;
+ }
+}
+
+static int l2cap_build_conf_req(struct sock *sk, void *data)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct l2cap_conf_req *req = data;
+ struct l2cap_conf_rfc rfc = { .mode = pi->mode };
+ void *ptr = req->data;
+
+ BT_DBG("sk %p", sk);
+
+ if (pi->num_conf_req || pi->num_conf_rsp)
+ goto done;
+
+ switch (pi->mode) {
+ case L2CAP_MODE_STREAMING:
+ case L2CAP_MODE_ERTM:
+ if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE)
+ break;
+
+ /* fall through */
+ default:
+ pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
+ break;
+ }
+
+done:
+ if (pi->imtu != L2CAP_DEFAULT_MTU)
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
+
+ switch (pi->mode) {
+ case L2CAP_MODE_BASIC:
+ if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) &&
+ !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING))
+ break;
+
+ rfc.mode = L2CAP_MODE_BASIC;
+ rfc.txwin_size = 0;
+ rfc.max_transmit = 0;
+ rfc.retrans_timeout = 0;
+ rfc.monitor_timeout = 0;
+ rfc.max_pdu_size = 0;
+
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
+ (unsigned long) &rfc);
+ break;
+
+ case L2CAP_MODE_ERTM:
+ rfc.mode = L2CAP_MODE_ERTM;
+ rfc.txwin_size = pi->tx_win;
+ rfc.max_transmit = pi->max_tx;
+ rfc.retrans_timeout = 0;
+ rfc.monitor_timeout = 0;
+ rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
+ if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
+ rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
+
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
+ (unsigned long) &rfc);
+
+ if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
+ break;
+
+ if (pi->fcs == L2CAP_FCS_NONE ||
+ pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
+ pi->fcs = L2CAP_FCS_NONE;
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
+ }
+ break;
+
+ case L2CAP_MODE_STREAMING:
+ rfc.mode = L2CAP_MODE_STREAMING;
+ rfc.txwin_size = 0;
+ rfc.max_transmit = 0;
+ rfc.retrans_timeout = 0;
+ rfc.monitor_timeout = 0;
+ rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
+ if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
+ rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
+
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
+ (unsigned long) &rfc);
+
+ if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
+ break;
+
+ if (pi->fcs == L2CAP_FCS_NONE ||
+ pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
+ pi->fcs = L2CAP_FCS_NONE;
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
+ }
+ break;
+ }
+
+ /* FIXME: Need actual value of the flush timeout */
+ //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
+ // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
+
+ req->dcid = cpu_to_le16(pi->dcid);
+ req->flags = cpu_to_le16(0);
+
+ return ptr - data;
+}
+
+static int l2cap_parse_conf_req(struct sock *sk, void *data)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct l2cap_conf_rsp *rsp = data;
+ void *ptr = rsp->data;
+ void *req = pi->conf_req;
+ int len = pi->conf_len;
+ int type, hint, olen;
+ unsigned long val;
+ struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
+ u16 mtu = L2CAP_DEFAULT_MTU;
+ u16 result = L2CAP_CONF_SUCCESS;
+
+ BT_DBG("sk %p", sk);
+
+ 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:
+ pi->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)
+ pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
+
+ break;
+
+ default:
+ if (hint)
+ break;
+
+ result = L2CAP_CONF_UNKNOWN;
+ *((u8 *) ptr++) = type;
+ break;
+ }
+ }
+
+ if (pi->num_conf_rsp || pi->num_conf_req > 1)
+ goto done;
+
+ switch (pi->mode) {
+ case L2CAP_MODE_STREAMING:
+ case L2CAP_MODE_ERTM:
+ if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
+ pi->mode = l2cap_select_mode(rfc.mode,
+ pi->conn->feat_mask);
+ break;
+ }
+
+ if (pi->mode != rfc.mode)
+ return -ECONNREFUSED;
+
+ break;
+ }
+
+done:
+ if (pi->mode != rfc.mode) {
+ result = L2CAP_CONF_UNACCEPT;
+ rfc.mode = pi->mode;
+
+ if (pi->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 {
+ pi->omtu = mtu;
+ pi->conf_state |= L2CAP_CONF_MTU_DONE;
+ }
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
+
+ switch (rfc.mode) {
+ case L2CAP_MODE_BASIC:
+ pi->fcs = L2CAP_FCS_NONE;
+ pi->conf_state |= L2CAP_CONF_MODE_DONE;
+ break;
+
+ case L2CAP_MODE_ERTM:
+ pi->remote_tx_win = rfc.txwin_size;
+ pi->remote_max_tx = rfc.max_transmit;
+
+ if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10)
+ rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
+
+ pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
+
+ rfc.retrans_timeout =
+ le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
+ rfc.monitor_timeout =
+ le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
+
+ pi->conf_state |= L2CAP_CONF_MODE_DONE;
+
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
+ sizeof(rfc), (unsigned long) &rfc);
+
+ break;
+
+ case L2CAP_MODE_STREAMING:
+ if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10)
+ rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
+
+ pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
+
+ pi->conf_state |= L2CAP_CONF_MODE_DONE;
+
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
+ sizeof(rfc), (unsigned long) &rfc);
+
+ break;
+
+ default:
+ result = L2CAP_CONF_UNACCEPT;
+
+ memset(&rfc, 0, sizeof(rfc));
+ rfc.mode = pi->mode;
+ }
+
+ if (result == L2CAP_CONF_SUCCESS)
+ pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
+ }
+ rsp->scid = cpu_to_le16(pi->dcid);
+ rsp->result = cpu_to_le16(result);
+ rsp->flags = cpu_to_le16(0x0000);
+
+ return ptr - data;
+}
+
+static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct l2cap_conf_req *req = data;
+ void *ptr = req->data;
+ int type, olen;
+ unsigned long val;
+ struct l2cap_conf_rfc rfc;
+
+ BT_DBG("sk %p, rsp %p, len %d, req %p", sk, 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;
+ pi->imtu = L2CAP_DEFAULT_MIN_MTU;
+ } else
+ pi->imtu = val;
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
+ break;
+
+ case L2CAP_CONF_FLUSH_TO:
+ pi->flush_to = val;
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
+ 2, pi->flush_to);
+ break;
+
+ case L2CAP_CONF_RFC:
+ if (olen == sizeof(rfc))
+ memcpy(&rfc, (void *)val, olen);
+
+ if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
+ rfc.mode != pi->mode)
+ return -ECONNREFUSED;
+
+ pi->fcs = 0;
+
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
+ sizeof(rfc), (unsigned long) &rfc);
+ break;
+ }
+ }
+
+ if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode)
+ return -ECONNREFUSED;
+
+ pi->mode = rfc.mode;
+
+ if (*result == L2CAP_CONF_SUCCESS) {
+ switch (rfc.mode) {
+ case L2CAP_MODE_ERTM:
+ pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
+ pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
+ pi->mps = le16_to_cpu(rfc.max_pdu_size);
+ break;
+ case L2CAP_MODE_STREAMING:
+ pi->mps = le16_to_cpu(rfc.max_pdu_size);
+ }
+ }
+
+ req->dcid = cpu_to_le16(pi->dcid);
+ req->flags = cpu_to_le16(0x0000);
+
+ return ptr - data;
+}
+
+static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
+{
+ struct l2cap_conf_rsp *rsp = data;
+ void *ptr = rsp->data;
+
+ BT_DBG("sk %p", sk);
+
+ rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ rsp->result = cpu_to_le16(result);
+ rsp->flags = cpu_to_le16(flags);
+
+ return ptr - data;
+}
+
+static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ int type, olen;
+ unsigned long val;
+ struct l2cap_conf_rfc rfc;
+
+ BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
+
+ if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
+ return;
+
+ while (len >= L2CAP_CONF_OPT_SIZE) {
+ len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
+
+ switch (type) {
+ case L2CAP_CONF_RFC:
+ if (olen == sizeof(rfc))
+ memcpy(&rfc, (void *)val, olen);
+ goto done;
+ }
+ }
+
+done:
+ switch (rfc.mode) {
+ case L2CAP_MODE_ERTM:
+ pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
+ pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
+ pi->mps = le16_to_cpu(rfc.max_pdu_size);
+ break;
+ case L2CAP_MODE_STREAMING:
+ pi->mps = le16_to_cpu(rfc.max_pdu_size);
+ }
+}
+
+static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+ struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
+
+ if (rej->reason != 0x0000)
+ return 0;
+
+ if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
+ cmd->ident == conn->info_ident) {
+ del_timer(&conn->info_timer);
+
+ conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+ conn->info_ident = 0;
+
+ l2cap_conn_start(conn);
+ }
+
+ return 0;
+}
+
+static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+ struct l2cap_chan_list *list = &conn->chan_list;
+ struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
+ struct l2cap_conn_rsp rsp;
+ 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 */
+ parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
+ if (!parent) {
+ result = L2CAP_CR_BAD_PSM;
+ goto sendresp;
+ }
+
+ bh_lock_sock(parent);
+
+ /* Check if the ACL is secure enough (if not SDP) */
+ if (psm != cpu_to_le16(0x0001) &&
+ !hci_conn_check_link_mode(conn->hcon)) {
+ conn->disc_reason = 0x05;
+ result = L2CAP_CR_SEC_BLOCK;
+ goto response;
+ }
+
+ result = L2CAP_CR_NO_MEM;
+
+ /* Check for backlog size */
+ if (sk_acceptq_is_full(parent)) {
+ BT_DBG("backlog full %d", parent->sk_ack_backlog);
+ goto response;
+ }
+
+ sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
+ if (!sk)
+ goto response;
+
+ write_lock_bh(&list->lock);
+
+ /* Check if we already have channel with that dcid */
+ if (__l2cap_get_chan_by_dcid(list, scid)) {
+ write_unlock_bh(&list->lock);
+ sock_set_flag(sk, SOCK_ZAPPED);
+ l2cap_sock_kill(sk);
+ goto response;
+ }
+
+ hci_conn_hold(conn->hcon);
+
+ l2cap_sock_init(sk, parent);
+ bacpy(&bt_sk(sk)->src, conn->src);
+ bacpy(&bt_sk(sk)->dst, conn->dst);
+ l2cap_pi(sk)->psm = psm;
+ l2cap_pi(sk)->dcid = scid;
+
+ __l2cap_chan_add(conn, sk, parent);
+ dcid = l2cap_pi(sk)->scid;
+
+ l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
+
+ l2cap_pi(sk)->ident = cmd->ident;
+
+ if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
+ if (l2cap_check_security(sk)) {
+ if (bt_sk(sk)->defer_setup) {
+ sk->sk_state = BT_CONNECT2;
+ result = L2CAP_CR_PEND;
+ status = L2CAP_CS_AUTHOR_PEND;
+ parent->sk_data_ready(parent, 0);
+ } else {
+ sk->sk_state = BT_CONFIG;
+ result = L2CAP_CR_SUCCESS;
+ status = L2CAP_CS_NO_INFO;
+ }
+ } else {
+ sk->sk_state = BT_CONNECT2;
+ result = L2CAP_CR_PEND;
+ status = L2CAP_CS_AUTHEN_PEND;
+ }
+ } else {
+ sk->sk_state = BT_CONNECT2;
+ result = L2CAP_CR_PEND;
+ status = L2CAP_CS_NO_INFO;
+ }
+
+ write_unlock_bh(&list->lock);
+
+response:
+ bh_unlock_sock(parent);
+
+sendresp:
+ rsp.scid = cpu_to_le16(scid);
+ rsp.dcid = cpu_to_le16(dcid);
+ rsp.result = cpu_to_le16(result);
+ rsp.status = cpu_to_le16(status);
+ l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+
+ if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
+ struct l2cap_info_req info;
+ info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
+
+ conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
+ conn->info_ident = l2cap_get_ident(conn);
+
+ mod_timer(&conn->info_timer, jiffies +
+ msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
+
+ l2cap_send_cmd(conn, conn->info_ident,
+ L2CAP_INFO_REQ, sizeof(info), &info);
+ }
+
+ if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) &&
+ result == L2CAP_CR_SUCCESS) {
+ u8 buf[128];
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+ l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+ l2cap_build_conf_req(sk, buf), buf);
+ l2cap_pi(sk)->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 sock *sk;
+ u8 req[128];
+
+ scid = __le16_to_cpu(rsp->scid);
+ dcid = __le16_to_cpu(rsp->dcid);
+ result = __le16_to_cpu(rsp->result);
+ status = __le16_to_cpu(rsp->status);
+
+ BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
+
+ if (scid) {
+ sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
+ if (!sk)
+ return -EFAULT;
+ } else {
+ sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
+ if (!sk)
+ return -EFAULT;
+ }
+
+ switch (result) {
+ case L2CAP_CR_SUCCESS:
+ sk->sk_state = BT_CONFIG;
+ l2cap_pi(sk)->ident = 0;
+ l2cap_pi(sk)->dcid = dcid;
+ l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
+
+ if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)
+ break;
+
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+
+ l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+ l2cap_build_conf_req(sk, req), req);
+ l2cap_pi(sk)->num_conf_req++;
+ break;
+
+ case L2CAP_CR_PEND:
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
+ break;
+
+ default:
+ /* don't delete l2cap channel if sk is owned by user */
+ if (sock_owned_by_user(sk)) {
+ sk->sk_state = BT_DISCONN;
+ l2cap_sock_clear_timer(sk);
+ l2cap_sock_set_timer(sk, HZ / 5);
+ break;
+ }
+
+ l2cap_chan_del(sk, ECONNREFUSED);
+ break;
+ }
+
+ bh_unlock_sock(sk);
+ return 0;
+}
+
+static inline void set_default_fcs(struct l2cap_pinfo *pi)
+{
+ /* FCS is enabled only in ERTM or streaming mode, if one or both
+ * sides request it.
+ */
+ if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING)
+ pi->fcs = L2CAP_FCS_NONE;
+ else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV))
+ pi->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 sock *sk;
+ int len;
+
+ dcid = __le16_to_cpu(req->dcid);
+ flags = __le16_to_cpu(req->flags);
+
+ BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
+
+ sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
+ if (!sk)
+ return -ENOENT;
+
+ if (sk->sk_state != BT_CONFIG) {
+ struct l2cap_cmd_rej rej;
+
+ rej.reason = cpu_to_le16(0x0002);
+ l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
+ sizeof(rej), &rej);
+ goto unlock;
+ }
+
+ /* Reject if config buffer is too small. */
+ len = cmd_len - sizeof(*req);
+ if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
+ l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
+ l2cap_build_conf_rsp(sk, rsp,
+ L2CAP_CONF_REJECT, flags), rsp);
+ goto unlock;
+ }
+
+ /* Store config. */
+ memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
+ l2cap_pi(sk)->conf_len += len;
+
+ if (flags & 0x0001) {
+ /* Incomplete config. Send empty response. */
+ l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
+ l2cap_build_conf_rsp(sk, rsp,
+ L2CAP_CONF_SUCCESS, 0x0001), rsp);
+ goto unlock;
+ }
+
+ /* Complete config. */
+ len = l2cap_parse_conf_req(sk, rsp);
+ if (len < 0) {
+ l2cap_send_disconn_req(conn, sk, ECONNRESET);
+ goto unlock;
+ }
+
+ l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
+ l2cap_pi(sk)->num_conf_rsp++;
+
+ /* Reset config buffer. */
+ l2cap_pi(sk)->conf_len = 0;
+
+ if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
+ goto unlock;
+
+ if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
+ set_default_fcs(l2cap_pi(sk));
+
+ sk->sk_state = BT_CONNECTED;
+
+ l2cap_pi(sk)->next_tx_seq = 0;
+ l2cap_pi(sk)->expected_tx_seq = 0;
+ __skb_queue_head_init(TX_QUEUE(sk));
+ if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
+ l2cap_ertm_init(sk);
+
+ l2cap_chan_ready(sk);
+ goto unlock;
+ }
+
+ if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
+ u8 buf[64];
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+ l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+ l2cap_build_conf_req(sk, buf), buf);
+ l2cap_pi(sk)->num_conf_req++;
+ }
+
+unlock:
+ bh_unlock_sock(sk);
+ return 0;
+}
+
+static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+ struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
+ u16 scid, flags, result;
+ struct sock *sk;
+ int len = cmd->len - sizeof(*rsp);
+
+ scid = __le16_to_cpu(rsp->scid);
+ flags = __le16_to_cpu(rsp->flags);
+ result = __le16_to_cpu(rsp->result);
+
+ BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
+ scid, flags, result);
+
+ sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
+ if (!sk)
+ return 0;
+
+ switch (result) {
+ case L2CAP_CONF_SUCCESS:
+ l2cap_conf_rfc_get(sk, rsp->data, len);
+ break;
+
+ case L2CAP_CONF_UNACCEPT:
+ if (l2cap_pi(sk)->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, sk, ECONNRESET);
+ goto done;
+ }
+
+ /* throw out any old stored conf requests */
+ result = L2CAP_CONF_SUCCESS;
+ len = l2cap_parse_conf_rsp(sk, rsp->data,
+ len, req, &result);
+ if (len < 0) {
+ l2cap_send_disconn_req(conn, sk, ECONNRESET);
+ goto done;
+ }
+
+ l2cap_send_cmd(conn, l2cap_get_ident(conn),
+ L2CAP_CONF_REQ, len, req);
+ l2cap_pi(sk)->num_conf_req++;
+ if (result != L2CAP_CONF_SUCCESS)
+ goto done;
+ break;
+ }
+
+ default:
+ sk->sk_err = ECONNRESET;
+ l2cap_sock_set_timer(sk, HZ * 5);
+ l2cap_send_disconn_req(conn, sk, ECONNRESET);
+ goto done;
+ }
+
+ if (flags & 0x01)
+ goto done;
+
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
+
+ if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
+ set_default_fcs(l2cap_pi(sk));
+
+ sk->sk_state = BT_CONNECTED;
+ l2cap_pi(sk)->next_tx_seq = 0;
+ l2cap_pi(sk)->expected_tx_seq = 0;
+ __skb_queue_head_init(TX_QUEUE(sk));
+ if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
+ l2cap_ertm_init(sk);
+
+ l2cap_chan_ready(sk);
+ }
+
+done:
+ bh_unlock_sock(sk);
+ return 0;
+}
+
+static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+ struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
+ struct l2cap_disconn_rsp rsp;
+ u16 dcid, scid;
+ struct 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);
+
+ sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
+ if (!sk)
+ return 0;
+
+ rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
+ rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
+
+ sk->sk_shutdown = SHUTDOWN_MASK;
+
+ /* don't delete l2cap channel if sk is owned by user */
+ if (sock_owned_by_user(sk)) {
+ sk->sk_state = BT_DISCONN;
+ l2cap_sock_clear_timer(sk);
+ l2cap_sock_set_timer(sk, HZ / 5);
+ bh_unlock_sock(sk);
+ return 0;
+ }
+
+ l2cap_chan_del(sk, ECONNRESET);
+ bh_unlock_sock(sk);
+
+ l2cap_sock_kill(sk);
+ return 0;
+}
+
+static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+ struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
+ u16 dcid, scid;
+ struct sock *sk;
+
+ scid = __le16_to_cpu(rsp->scid);
+ dcid = __le16_to_cpu(rsp->dcid);
+
+ BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
+
+ sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
+ if (!sk)
+ return 0;
+
+ /* don't delete l2cap channel if sk is owned by user */
+ if (sock_owned_by_user(sk)) {
+ sk->sk_state = BT_DISCONN;
+ l2cap_sock_clear_timer(sk);
+ l2cap_sock_set_timer(sk, HZ / 5);
+ bh_unlock_sock(sk);
+ return 0;
+ }
+
+ l2cap_chan_del(sk, 0);
+ bh_unlock_sock(sk);
+
+ l2cap_sock_kill(sk);
+ return 0;
+}
+
+static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+ struct l2cap_info_req *req = (struct l2cap_info_req *) data;
+ u16 type;
+
+ type = __le16_to_cpu(req->type);
+
+ BT_DBG("type 0x%4.4x", type);
+
+ if (type == L2CAP_IT_FEAT_MASK) {
+ u8 buf[8];
+ u32 feat_mask = l2cap_feat_mask;
+ struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
+ rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
+ rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
+ if (!disable_ertm)
+ feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
+ | L2CAP_FEAT_FCS;
+ put_unaligned_le32(feat_mask, rsp->data);
+ l2cap_send_cmd(conn, cmd->ident,
+ L2CAP_INFO_RSP, sizeof(buf), buf);
+ } else if (type == L2CAP_IT_FIXED_CHAN) {
+ u8 buf[12];
+ struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
+ rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
+ rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
+ memcpy(buf + 4, l2cap_fixed_chan, 8);
+ l2cap_send_cmd(conn, cmd->ident,
+ L2CAP_INFO_RSP, sizeof(buf), buf);
+ } else {
+ struct l2cap_info_rsp rsp;
+ rsp.type = cpu_to_le16(type);
+ rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
+ l2cap_send_cmd(conn, cmd->ident,
+ L2CAP_INFO_RSP, sizeof(rsp), &rsp);
+ }
+
+ return 0;
+}
+
+static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+ struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
+ u16 type, result;
+
+ type = __le16_to_cpu(rsp->type);
+ result = __le16_to_cpu(rsp->result);
+
+ BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
+
+ del_timer(&conn->info_timer);
+
+ if (result != L2CAP_IR_SUCCESS) {
+ conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+ conn->info_ident = 0;
+
+ l2cap_conn_start(conn);
+
+ return 0;
+ }
+
+ if (type == L2CAP_IT_FEAT_MASK) {
+ conn->feat_mask = get_unaligned_le32(rsp->data);
+
+ if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
+ struct l2cap_info_req req;
+ req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
+
+ conn->info_ident = l2cap_get_ident(conn);
+
+ l2cap_send_cmd(conn, conn->info_ident,
+ L2CAP_INFO_REQ, sizeof(req), &req);
+ } else {
+ conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+ conn->info_ident = 0;
+
+ l2cap_conn_start(conn);
+ }
+ } else if (type == L2CAP_IT_FIXED_CHAN) {
+ conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+ conn->info_ident = 0;
+
+ l2cap_conn_start(conn);
+ }
+
+ return 0;
+}
+
+static inline 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 = 0;
+
+ 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;
+ }
+
+ switch (cmd.code) {
+ case L2CAP_COMMAND_REJ:
+ l2cap_command_rej(conn, &cmd, data);
+ break;
+
+ case L2CAP_CONN_REQ:
+ err = l2cap_connect_req(conn, &cmd, data);
+ break;
+
+ case L2CAP_CONN_RSP:
+ err = l2cap_connect_rsp(conn, &cmd, data);
+ break;
+
+ case L2CAP_CONF_REQ:
+ err = l2cap_config_req(conn, &cmd, cmd_len, data);
+ break;
+
+ case L2CAP_CONF_RSP:
+ err = l2cap_config_rsp(conn, &cmd, data);
+ break;
+
+ case L2CAP_DISCONN_REQ:
+ err = l2cap_disconnect_req(conn, &cmd, data);
+ break;
+
+ case L2CAP_DISCONN_RSP:
+ err = l2cap_disconnect_rsp(conn, &cmd, data);
+ break;
+
+ case L2CAP_ECHO_REQ:
+ l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
+ break;
+
+ case L2CAP_ECHO_RSP:
+ break;
+
+ case L2CAP_INFO_REQ:
+ err = l2cap_information_req(conn, &cmd, data);
+ break;
+
+ case L2CAP_INFO_RSP:
+ err = l2cap_information_rsp(conn, &cmd, data);
+ break;
+
+ default:
+ BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
+ err = -EINVAL;
+ break;
+ }
+
+ if (err) {
+ struct l2cap_cmd_rej rej;
+ BT_DBG("error %d", err);
+
+ /* FIXME: Map err to a valid reason */
+ rej.reason = cpu_to_le16(0);
+ l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
+ }
+
+ data += cmd_len;
+ len -= cmd_len;
+ }
+
+ kfree_skb(skb);
+}
+
+static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
+{
+ u16 our_fcs, rcv_fcs;
+ int hdr_size = L2CAP_HDR_SIZE + 2;
+
+ if (pi->fcs == L2CAP_FCS_CRC16) {
+ skb_trim(skb, skb->len - 2);
+ rcv_fcs = get_unaligned_le16(skb->data + skb->len);
+ our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
+
+ if (our_fcs != rcv_fcs)
+ return -EBADMSG;
+ }
+ return 0;
+}
+
+static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ u16 control = 0;
+
+ pi->frames_sent = 0;
+
+ control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+
+ if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
+ control |= L2CAP_SUPER_RCV_NOT_READY;
+ l2cap_send_sframe(pi, control);
+ pi->conn_state |= L2CAP_CONN_RNR_SENT;
+ }
+
+ if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY)
+ l2cap_retransmit_frames(sk);
+
+ l2cap_ertm_send(sk);
+
+ if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
+ pi->frames_sent == 0) {
+ control |= L2CAP_SUPER_RCV_READY;
+ l2cap_send_sframe(pi, control);
+ }
+}
+
+static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
+{
+ struct sk_buff *next_skb;
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ int tx_seq_offset, next_tx_seq_offset;
+
+ bt_cb(skb)->tx_seq = tx_seq;
+ bt_cb(skb)->sar = sar;
+
+ next_skb = skb_peek(SREJ_QUEUE(sk));
+ if (!next_skb) {
+ __skb_queue_tail(SREJ_QUEUE(sk), skb);
+ return 0;
+ }
+
+ tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
+ if (tx_seq_offset < 0)
+ tx_seq_offset += 64;
+
+ do {
+ if (bt_cb(next_skb)->tx_seq == tx_seq)
+ return -EINVAL;
+
+ next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
+ pi->buffer_seq) % 64;
+ if (next_tx_seq_offset < 0)
+ next_tx_seq_offset += 64;
+
+ if (next_tx_seq_offset > tx_seq_offset) {
+ __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
+ return 0;
+ }
+
+ if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
+ break;
+
+ } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
+
+ __skb_queue_tail(SREJ_QUEUE(sk), skb);
+
+ return 0;
+}
+
+static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct sk_buff *_skb;
+ int err;
+
+ switch (control & L2CAP_CTRL_SAR) {
+ case L2CAP_SDU_UNSEGMENTED:
+ if (pi->conn_state & L2CAP_CONN_SAR_SDU)
+ goto drop;
+
+ err = sock_queue_rcv_skb(sk, skb);
+ if (!err)
+ return err;
+
+ break;
+
+ case L2CAP_SDU_START:
+ if (pi->conn_state & L2CAP_CONN_SAR_SDU)
+ goto drop;
+
+ pi->sdu_len = get_unaligned_le16(skb->data);
+
+ if (pi->sdu_len > pi->imtu)
+ goto disconnect;
+
+ pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
+ if (!pi->sdu)
+ return -ENOMEM;
+
+ /* pull sdu_len bytes only after alloc, because of Local Busy
+ * condition we have to be sure that this will be executed
+ * only once, i.e., when alloc does not fail */
+ skb_pull(skb, 2);
+
+ memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+ pi->conn_state |= L2CAP_CONN_SAR_SDU;
+ pi->partial_sdu_len = skb->len;
+ break;
+
+ case L2CAP_SDU_CONTINUE:
+ if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+ goto disconnect;
+
+ if (!pi->sdu)
+ goto disconnect;
+
+ pi->partial_sdu_len += skb->len;
+ if (pi->partial_sdu_len > pi->sdu_len)
+ goto drop;
+
+ memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+ break;
+
+ case L2CAP_SDU_END:
+ if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+ goto disconnect;
+
+ if (!pi->sdu)
+ goto disconnect;
+
+ if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) {
+ pi->partial_sdu_len += skb->len;
+
+ if (pi->partial_sdu_len > pi->imtu)
+ goto drop;
+
+ if (pi->partial_sdu_len != pi->sdu_len)
+ goto drop;
+
+ memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+ }
+
+ _skb = skb_clone(pi->sdu, GFP_ATOMIC);
+ if (!_skb) {
+ pi->conn_state |= L2CAP_CONN_SAR_RETRY;
+ return -ENOMEM;
+ }
+
+ err = sock_queue_rcv_skb(sk, _skb);
+ if (err < 0) {
+ kfree_skb(_skb);
+ pi->conn_state |= L2CAP_CONN_SAR_RETRY;
+ return err;
+ }
+
+ pi->conn_state &= ~L2CAP_CONN_SAR_RETRY;
+ pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
+
+ kfree_skb(pi->sdu);
+ break;
+ }
+
+ kfree_skb(skb);
+ return 0;
+
+drop:
+ kfree_skb(pi->sdu);
+ pi->sdu = NULL;
+
+disconnect:
+ l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+ kfree_skb(skb);
+ return 0;
+}
+
+static int l2cap_try_push_rx_skb(struct sock *sk)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct sk_buff *skb;
+ u16 control;
+ int err;
+
+ while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) {
+ control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
+ err = l2cap_ertm_reassembly_sdu(sk, skb, control);
+ if (err < 0) {
+ skb_queue_head(BUSY_QUEUE(sk), skb);
+ return -EBUSY;
+ }
+
+ pi->buffer_seq = (pi->buffer_seq + 1) % 64;
+ }
+
+ if (!(pi->conn_state & L2CAP_CONN_RNR_SENT))
+ goto done;
+
+ control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+ control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
+ l2cap_send_sframe(pi, control);
+ l2cap_pi(sk)->retry_count = 1;
+
+ del_timer(&pi->retrans_timer);
+ __mod_monitor_timer();
+
+ l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
+
+done:
+ pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
+ pi->conn_state &= ~L2CAP_CONN_RNR_SENT;
+
+ BT_DBG("sk %p, Exit local busy", sk);
+
+ return 0;
+}
+
+static void l2cap_busy_work(struct work_struct *work)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ struct l2cap_pinfo *pi =
+ container_of(work, struct l2cap_pinfo, busy_work);
+ struct sock *sk = (struct sock *)pi;
+ int n_tries = 0, timeo = HZ/5, err;
+ struct sk_buff *skb;
+
+ lock_sock(sk);
+
+ add_wait_queue(sk_sleep(sk), &wait);
+ while ((skb = skb_peek(BUSY_QUEUE(sk)))) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
+ err = -EBUSY;
+ l2cap_send_disconn_req(pi->conn, sk, EBUSY);
+ break;
+ }
+
+ if (!timeo)
+ timeo = HZ/5;
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeo);
+ break;
+ }
+
+ release_sock(sk);
+ timeo = schedule_timeout(timeo);
+ lock_sock(sk);
+
+ err = sock_error(sk);
+ if (err)
+ break;
+
+ if (l2cap_try_push_rx_skb(sk) == 0)
+ break;
+ }
+
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(sk_sleep(sk), &wait);
+
+ release_sock(sk);
+}
+
+static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ int sctrl, err;
+
+ if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
+ bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
+ __skb_queue_tail(BUSY_QUEUE(sk), skb);
+ return l2cap_try_push_rx_skb(sk);
+
+
+ }
+
+ err = l2cap_ertm_reassembly_sdu(sk, skb, control);
+ if (err >= 0) {
+ pi->buffer_seq = (pi->buffer_seq + 1) % 64;
+ return err;
+ }
+
+ /* Busy Condition */
+ BT_DBG("sk %p, Enter local busy", sk);
+
+ pi->conn_state |= L2CAP_CONN_LOCAL_BUSY;
+ bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
+ __skb_queue_tail(BUSY_QUEUE(sk), skb);
+
+ sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+ sctrl |= L2CAP_SUPER_RCV_NOT_READY;
+ l2cap_send_sframe(pi, sctrl);
+
+ pi->conn_state |= L2CAP_CONN_RNR_SENT;
+
+ del_timer(&pi->ack_timer);
+
+ queue_work(_busy_wq, &pi->busy_work);
+
+ return err;
+}
+
+static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct sk_buff *_skb;
+ int err = -EINVAL;
+
+ /*
+ * TODO: We have to notify the userland if some data is lost with the
+ * Streaming Mode.
+ */
+
+ switch (control & L2CAP_CTRL_SAR) {
+ case L2CAP_SDU_UNSEGMENTED:
+ if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
+ kfree_skb(pi->sdu);
+ break;
+ }
+
+ err = sock_queue_rcv_skb(sk, skb);
+ if (!err)
+ return 0;
+
+ break;
+
+ case L2CAP_SDU_START:
+ if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
+ kfree_skb(pi->sdu);
+ break;
+ }
+
+ pi->sdu_len = get_unaligned_le16(skb->data);
+ skb_pull(skb, 2);
+
+ if (pi->sdu_len > pi->imtu) {
+ err = -EMSGSIZE;
+ break;
+ }
+
+ pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
+ if (!pi->sdu) {
+ err = -ENOMEM;
+ break;
+ }
+
+ memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+ pi->conn_state |= L2CAP_CONN_SAR_SDU;
+ pi->partial_sdu_len = skb->len;
+ err = 0;
+ break;
+
+ case L2CAP_SDU_CONTINUE:
+ if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+ break;
+
+ memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+ pi->partial_sdu_len += skb->len;
+ if (pi->partial_sdu_len > pi->sdu_len)
+ kfree_skb(pi->sdu);
+ else
+ err = 0;
+
+ break;
+
+ case L2CAP_SDU_END:
+ if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+ break;
+
+ memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+ pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
+ pi->partial_sdu_len += skb->len;
+
+ if (pi->partial_sdu_len > pi->imtu)
+ goto drop;
+
+ if (pi->partial_sdu_len == pi->sdu_len) {
+ _skb = skb_clone(pi->sdu, GFP_ATOMIC);
+ err = sock_queue_rcv_skb(sk, _skb);
+ if (err < 0)
+ kfree_skb(_skb);
+ }
+ err = 0;
+
+drop:
+ kfree_skb(pi->sdu);
+ break;
+ }
+
+ kfree_skb(skb);
+ return err;
+}
+
+static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
+{
+ struct sk_buff *skb;
+ u16 control;
+
+ while ((skb = skb_peek(SREJ_QUEUE(sk)))) {
+ if (bt_cb(skb)->tx_seq != tx_seq)
+ break;
+
+ skb = skb_dequeue(SREJ_QUEUE(sk));
+ control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
+ l2cap_ertm_reassembly_sdu(sk, skb, control);
+ l2cap_pi(sk)->buffer_seq_srej =
+ (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
+ tx_seq = (tx_seq + 1) % 64;
+ }
+}
+
+static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct srej_list *l, *tmp;
+ u16 control;
+
+ list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
+ if (l->tx_seq == tx_seq) {
+ list_del(&l->list);
+ kfree(l);
+ return;
+ }
+ control = L2CAP_SUPER_SELECT_REJECT;
+ control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+ l2cap_send_sframe(pi, control);
+ list_del(&l->list);
+ list_add_tail(&l->list, SREJ_LIST(sk));
+ }
+}
+
+static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct srej_list *new;
+ u16 control;
+
+ while (tx_seq != pi->expected_tx_seq) {
+ control = L2CAP_SUPER_SELECT_REJECT;
+ control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+ l2cap_send_sframe(pi, control);
+
+ new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
+ new->tx_seq = pi->expected_tx_seq;
+ pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
+ list_add_tail(&new->list, SREJ_LIST(sk));
+ }
+ pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
+}
+
+static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ u8 tx_seq = __get_txseq(rx_control);
+ u8 req_seq = __get_reqseq(rx_control);
+ u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
+ int tx_seq_offset, expected_tx_seq_offset;
+ int num_to_ack = (pi->tx_win/6) + 1;
+ int err = 0;
+
+ BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq,
+ rx_control);
+
+ if (L2CAP_CTRL_FINAL & rx_control &&
+ l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
+ del_timer(&pi->monitor_timer);
+ if (pi->unacked_frames > 0)
+ __mod_retrans_timer();
+ pi->conn_state &= ~L2CAP_CONN_WAIT_F;
+ }
+
+ pi->expected_ack_seq = req_seq;
+ l2cap_drop_acked_frames(sk);
+
+ if (tx_seq == pi->expected_tx_seq)
+ goto expected;
+
+ tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
+ if (tx_seq_offset < 0)
+ tx_seq_offset += 64;
+
+ /* invalid tx_seq */
+ if (tx_seq_offset >= pi->tx_win) {
+ l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+ goto drop;
+ }
+
+ if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY)
+ goto drop;
+
+ if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
+ struct srej_list *first;
+
+ first = list_first_entry(SREJ_LIST(sk),
+ struct srej_list, list);
+ if (tx_seq == first->tx_seq) {
+ l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
+ l2cap_check_srej_gap(sk, tx_seq);
+
+ list_del(&first->list);
+ kfree(first);
+
+ if (list_empty(SREJ_LIST(sk))) {
+ pi->buffer_seq = pi->buffer_seq_srej;
+ pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
+ l2cap_send_ack(pi);
+ BT_DBG("sk %p, Exit SREJ_SENT", sk);
+ }
+ } else {
+ struct srej_list *l;
+
+ /* duplicated tx_seq */
+ if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0)
+ goto drop;
+
+ list_for_each_entry(l, SREJ_LIST(sk), list) {
+ if (l->tx_seq == tx_seq) {
+ l2cap_resend_srejframe(sk, tx_seq);
+ return 0;
+ }
+ }
+ l2cap_send_srejframe(sk, tx_seq);
+ }
+ } else {
+ expected_tx_seq_offset =
+ (pi->expected_tx_seq - pi->buffer_seq) % 64;
+ if (expected_tx_seq_offset < 0)
+ expected_tx_seq_offset += 64;
+
+ /* duplicated tx_seq */
+ if (tx_seq_offset < expected_tx_seq_offset)
+ goto drop;
+
+ pi->conn_state |= L2CAP_CONN_SREJ_SENT;
+
+ BT_DBG("sk %p, Enter SREJ", sk);
+
+ INIT_LIST_HEAD(SREJ_LIST(sk));
+ pi->buffer_seq_srej = pi->buffer_seq;
+
+ __skb_queue_head_init(SREJ_QUEUE(sk));
+ __skb_queue_head_init(BUSY_QUEUE(sk));
+ l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
+
+ pi->conn_state |= L2CAP_CONN_SEND_PBIT;
+
+ l2cap_send_srejframe(sk, tx_seq);
+
+ del_timer(&pi->ack_timer);
+ }
+ return 0;
+
+expected:
+ pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
+
+ if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
+ bt_cb(skb)->tx_seq = tx_seq;
+ bt_cb(skb)->sar = sar;
+ __skb_queue_tail(SREJ_QUEUE(sk), skb);
+ return 0;
+ }
+
+ err = l2cap_push_rx_skb(sk, skb, rx_control);
+ if (err < 0)
+ return 0;
+
+ if (rx_control & L2CAP_CTRL_FINAL) {
+ if (pi->conn_state & L2CAP_CONN_REJ_ACT)
+ pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
+ else
+ l2cap_retransmit_frames(sk);
+ }
+
+ __mod_ack_timer();
+
+ pi->num_acked = (pi->num_acked + 1) % num_to_ack;
+ if (pi->num_acked == num_to_ack - 1)
+ l2cap_send_ack(pi);
+
+ return 0;
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+
+ BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control),
+ rx_control);
+
+ pi->expected_ack_seq = __get_reqseq(rx_control);
+ l2cap_drop_acked_frames(sk);
+
+ if (rx_control & L2CAP_CTRL_POLL) {
+ pi->conn_state |= L2CAP_CONN_SEND_FBIT;
+ if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
+ if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
+ (pi->unacked_frames > 0))
+ __mod_retrans_timer();
+
+ pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+ l2cap_send_srejtail(sk);
+ } else {
+ l2cap_send_i_or_rr_or_rnr(sk);
+ }
+
+ } else if (rx_control & L2CAP_CTRL_FINAL) {
+ pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+
+ if (pi->conn_state & L2CAP_CONN_REJ_ACT)
+ pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
+ else
+ l2cap_retransmit_frames(sk);
+
+ } else {
+ if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
+ (pi->unacked_frames > 0))
+ __mod_retrans_timer();
+
+ pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+ if (pi->conn_state & L2CAP_CONN_SREJ_SENT)
+ l2cap_send_ack(pi);
+ else
+ l2cap_ertm_send(sk);
+ }
+}
+
+static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ u8 tx_seq = __get_reqseq(rx_control);
+
+ BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
+
+ pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+
+ pi->expected_ack_seq = tx_seq;
+ l2cap_drop_acked_frames(sk);
+
+ if (rx_control & L2CAP_CTRL_FINAL) {
+ if (pi->conn_state & L2CAP_CONN_REJ_ACT)
+ pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
+ else
+ l2cap_retransmit_frames(sk);
+ } else {
+ l2cap_retransmit_frames(sk);
+
+ if (pi->conn_state & L2CAP_CONN_WAIT_F)
+ pi->conn_state |= L2CAP_CONN_REJ_ACT;
+ }
+}
+static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ u8 tx_seq = __get_reqseq(rx_control);
+
+ BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
+
+ pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+
+ if (rx_control & L2CAP_CTRL_POLL) {
+ pi->expected_ack_seq = tx_seq;
+ l2cap_drop_acked_frames(sk);
+
+ pi->conn_state |= L2CAP_CONN_SEND_FBIT;
+ l2cap_retransmit_one_frame(sk, tx_seq);
+
+ l2cap_ertm_send(sk);
+
+ if (pi->conn_state & L2CAP_CONN_WAIT_F) {
+ pi->srej_save_reqseq = tx_seq;
+ pi->conn_state |= L2CAP_CONN_SREJ_ACT;
+ }
+ } else if (rx_control & L2CAP_CTRL_FINAL) {
+ if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
+ pi->srej_save_reqseq == tx_seq)
+ pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
+ else
+ l2cap_retransmit_one_frame(sk, tx_seq);
+ } else {
+ l2cap_retransmit_one_frame(sk, tx_seq);
+ if (pi->conn_state & L2CAP_CONN_WAIT_F) {
+ pi->srej_save_reqseq = tx_seq;
+ pi->conn_state |= L2CAP_CONN_SREJ_ACT;
+ }
+ }
+}
+
+static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ u8 tx_seq = __get_reqseq(rx_control);
+
+ BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
+
+ pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
+ pi->expected_ack_seq = tx_seq;
+ l2cap_drop_acked_frames(sk);
+
+ if (rx_control & L2CAP_CTRL_POLL)
+ pi->conn_state |= L2CAP_CONN_SEND_FBIT;
+
+ if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
+ del_timer(&pi->retrans_timer);
+ if (rx_control & L2CAP_CTRL_POLL)
+ l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL);
+ return;
+ }
+
+ if (rx_control & L2CAP_CTRL_POLL)
+ l2cap_send_srejtail(sk);
+ else
+ l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
+}
+
+static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
+{
+ BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
+
+ if (L2CAP_CTRL_FINAL & rx_control &&
+ l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
+ del_timer(&l2cap_pi(sk)->monitor_timer);
+ if (l2cap_pi(sk)->unacked_frames > 0)
+ __mod_retrans_timer();
+ l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
+ }
+
+ switch (rx_control & L2CAP_CTRL_SUPERVISE) {
+ case L2CAP_SUPER_RCV_READY:
+ l2cap_data_channel_rrframe(sk, rx_control);
+ break;
+
+ case L2CAP_SUPER_REJECT:
+ l2cap_data_channel_rejframe(sk, rx_control);
+ break;
+
+ case L2CAP_SUPER_SELECT_REJECT:
+ l2cap_data_channel_srejframe(sk, rx_control);
+ break;
+
+ case L2CAP_SUPER_RCV_NOT_READY:
+ l2cap_data_channel_rnrframe(sk, rx_control);
+ break;
+ }
+
+ kfree_skb(skb);
+ return 0;
+}
+
+static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+ u16 control;
+ u8 req_seq;
+ int len, next_tx_seq_offset, req_seq_offset;
+
+ control = get_unaligned_le16(skb->data);
+ skb_pull(skb, 2);
+ len = skb->len;
+
+ /*
+ * We can just drop the corrupted I-frame here.
+ * Receiver will miss it and start proper recovery
+ * procedures and ask retransmission.
+ */
+ if (l2cap_check_fcs(pi, skb))
+ goto drop;
+
+ if (__is_sar_start(control) && __is_iframe(control))
+ len -= 2;
+
+ if (pi->fcs == L2CAP_FCS_CRC16)
+ len -= 2;
+
+ if (len > pi->mps) {
+ l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+ goto drop;
+ }
+
+ req_seq = __get_reqseq(control);
+ req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
+ if (req_seq_offset < 0)
+ req_seq_offset += 64;
+
+ next_tx_seq_offset =
+ (pi->next_tx_seq - pi->expected_ack_seq) % 64;
+ if (next_tx_seq_offset < 0)
+ next_tx_seq_offset += 64;
+
+ /* check for invalid req-seq */
+ if (req_seq_offset > next_tx_seq_offset) {
+ l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+ goto drop;
+ }
+
+ if (__is_iframe(control)) {
+ if (len < 0) {
+ l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+ goto drop;
+ }
+
+ l2cap_data_channel_iframe(sk, control, skb);
+ } else {
+ if (len != 0) {
+ BT_ERR("%d", len);
+ l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+ goto drop;
+ }
+
+ l2cap_data_channel_sframe(sk, 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 sock *sk;
+ struct l2cap_pinfo *pi;
+ u16 control;
+ u8 tx_seq;
+ int len;
+
+ sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
+ if (!sk) {
+ BT_DBG("unknown cid 0x%4.4x", cid);
+ goto drop;
+ }
+
+ pi = l2cap_pi(sk);
+
+ BT_DBG("sk %p, len %d", sk, skb->len);
+
+ if (sk->sk_state != BT_CONNECTED)
+ goto drop;
+
+ switch (pi->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 (pi->imtu < skb->len)
+ goto drop;
+
+ if (!sock_queue_rcv_skb(sk, skb))
+ goto done;
+ break;
+
+ case L2CAP_MODE_ERTM:
+ if (!sock_owned_by_user(sk)) {
+ l2cap_ertm_data_rcv(sk, skb);
+ } else {
+ if (sk_add_backlog(sk, skb))
+ goto drop;
+ }
+
+ goto done;
+
+ case L2CAP_MODE_STREAMING:
+ control = get_unaligned_le16(skb->data);
+ skb_pull(skb, 2);
+ len = skb->len;
+
+ if (l2cap_check_fcs(pi, skb))
+ goto drop;
+
+ if (__is_sar_start(control))
+ len -= 2;
+
+ if (pi->fcs == L2CAP_FCS_CRC16)
+ len -= 2;
+
+ if (len > pi->mps || len < 0 || __is_sframe(control))
+ goto drop;
+
+ tx_seq = __get_txseq(control);
+
+ if (pi->expected_tx_seq == tx_seq)
+ pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
+ else
+ pi->expected_tx_seq = (tx_seq + 1) % 64;
+
+ l2cap_streaming_reassembly_sdu(sk, skb, control);
+
+ goto done;
+
+ default:
+ BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
+ break;
+ }
+
+drop:
+ kfree_skb(skb);
+
+done:
+ if (sk)
+ bh_unlock_sock(sk);
+
+ return 0;
+}
+
+static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
+{
+ struct sock *sk;
+
+ sk = l2cap_get_sock_by_psm(0, psm, conn->src);
+ if (!sk)
+ goto drop;
+
+ bh_lock_sock(sk);
+
+ BT_DBG("sk %p, len %d", sk, skb->len);
+
+ if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
+ goto drop;
+
+ if (l2cap_pi(sk)->imtu < skb->len)
+ goto drop;
+
+ if (!sock_queue_rcv_skb(sk, skb))
+ goto done;
+
+drop:
+ kfree_skb(skb);
+
+done:
+ if (sk)
+ bh_unlock_sock(sk);
+ return 0;
+}
+
+static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
+{
+ struct l2cap_hdr *lh = (void *) skb->data;
+ u16 cid, len;
+ __le16 psm;
+
+ skb_pull(skb, L2CAP_HDR_SIZE);
+ cid = __le16_to_cpu(lh->cid);
+ len = __le16_to_cpu(lh->len);
+
+ if (len != skb->len) {
+ kfree_skb(skb);
+ return;
+ }
+
+ BT_DBG("len %d, cid 0x%4.4x", len, cid);
+
+ switch (cid) {
+ case L2CAP_CID_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;
+
+ default:
+ l2cap_data_channel(conn, cid, skb);
+ break;
+ }
+}
+
+/* ---- L2CAP interface with lower layer (HCI) ---- */
+
+static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
+{
+ int exact = 0, lm1 = 0, lm2 = 0;
+ register struct sock *sk;
+ struct hlist_node *node;
+
+ if (type != ACL_LINK)
+ return -EINVAL;
+
+ BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
+
+ /* Find listening sockets and check their link_mode */
+ read_lock(&l2cap_sk_list.lock);
+ sk_for_each(sk, node, &l2cap_sk_list.head) {
+ if (sk->sk_state != BT_LISTEN)
+ continue;
+
+ if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
+ lm1 |= HCI_LM_ACCEPT;
+ if (l2cap_pi(sk)->role_switch)
+ lm1 |= HCI_LM_MASTER;
+ exact++;
+ } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
+ lm2 |= HCI_LM_ACCEPT;
+ if (l2cap_pi(sk)->role_switch)
+ lm2 |= HCI_LM_MASTER;
+ }
+ }
+ read_unlock(&l2cap_sk_list.lock);
+
+ return exact ? lm1 : lm2;
+}
+
+static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
+{
+ struct l2cap_conn *conn;
+
+ BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
+
+ if (hcon->type != ACL_LINK)
+ return -EINVAL;
+
+ if (!status) {
+ conn = l2cap_conn_add(hcon, status);
+ if (conn)
+ l2cap_conn_ready(conn);
+ } else
+ l2cap_conn_del(hcon, bt_err(status));
+
+ return 0;
+}
+
+static int l2cap_disconn_ind(struct hci_conn *hcon)
+{
+ struct l2cap_conn *conn = hcon->l2cap_data;
+
+ BT_DBG("hcon %p", hcon);
+
+ if (hcon->type != ACL_LINK || !conn)
+ return 0x13;
+
+ return conn->disc_reason;
+}
+
+static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
+{
+ BT_DBG("hcon %p reason %d", hcon, reason);
+
+ if (hcon->type != ACL_LINK)
+ return -EINVAL;
+
+ l2cap_conn_del(hcon, bt_err(reason));
+
+ return 0;
+}
+
+static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
+{
+ if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM)
+ return;
+
+ if (encrypt == 0x00) {
+ if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
+ l2cap_sock_clear_timer(sk);
+ l2cap_sock_set_timer(sk, HZ * 5);
+ } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
+ __l2cap_sock_close(sk, ECONNREFUSED);
+ } else {
+ if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
+ l2cap_sock_clear_timer(sk);
+ }
+}
+
+static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
+{
+ struct l2cap_chan_list *l;
+ struct l2cap_conn *conn = hcon->l2cap_data;
+ struct sock *sk;
+
+ if (!conn)
+ return 0;
+
+ l = &conn->chan_list;
+
+ BT_DBG("conn %p", conn);
+
+ read_lock(&l->lock);
+
+ for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+ bh_lock_sock(sk);
+
+ if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
+ bh_unlock_sock(sk);
+ continue;
+ }
+
+ if (!status && (sk->sk_state == BT_CONNECTED ||
+ sk->sk_state == BT_CONFIG)) {
+ l2cap_check_encryption(sk, encrypt);
+ bh_unlock_sock(sk);
+ continue;
+ }
+
+ if (sk->sk_state == BT_CONNECT) {
+ if (!status) {
+ struct l2cap_conn_req req;
+ req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
+ req.psm = l2cap_pi(sk)->psm;
+
+ l2cap_pi(sk)->ident = l2cap_get_ident(conn);
+ l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
+
+ l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+ L2CAP_CONN_REQ, sizeof(req), &req);
+ } else {
+ l2cap_sock_clear_timer(sk);
+ l2cap_sock_set_timer(sk, HZ / 10);
+ }
+ } else if (sk->sk_state == BT_CONNECT2) {
+ struct l2cap_conn_rsp rsp;
+ __u16 result;
+
+ if (!status) {
+ sk->sk_state = BT_CONFIG;
+ result = L2CAP_CR_SUCCESS;
+ } else {
+ sk->sk_state = BT_DISCONN;
+ l2cap_sock_set_timer(sk, HZ / 10);
+ result = L2CAP_CR_SEC_BLOCK;
+ }
+
+ rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
+ rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
+ rsp.result = cpu_to_le16(result);
+ rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
+ l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+ L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+ }
+
+ bh_unlock_sock(sk);
+ }
+
+ read_unlock(&l->lock);
+
+ return 0;
+}
+
+static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
+{
+ struct l2cap_conn *conn = hcon->l2cap_data;
+
+ if (!conn)
+ conn = l2cap_conn_add(hcon, 0);
+
+ if (!conn)
+ goto drop;
+
+ BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
+
+ if (!(flags & ACL_CONT)) {
+ struct l2cap_hdr *hdr;
+ struct sock *sk;
+ u16 cid;
+ int len;
+
+ if (conn->rx_len) {
+ BT_ERR("Unexpected start frame (len %d)", skb->len);
+ kfree_skb(conn->rx_skb);
+ conn->rx_skb = NULL;
+ conn->rx_len = 0;
+ l2cap_conn_unreliable(conn, ECOMM);
+ }
+
+ /* Start fragment always begin with Basic L2CAP header */
+ if (skb->len < L2CAP_HDR_SIZE) {
+ BT_ERR("Frame is too short (len %d)", skb->len);
+ l2cap_conn_unreliable(conn, ECOMM);
+ goto drop;
+ }
+
+ hdr = (struct l2cap_hdr *) skb->data;
+ len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
+ cid = __le16_to_cpu(hdr->cid);
+
+ if (len == skb->len) {
+ /* Complete frame received */
+ l2cap_recv_frame(conn, skb);
+ return 0;
+ }
+
+ BT_DBG("Start: total len %d, frag len %d", len, skb->len);
+
+ if (skb->len > len) {
+ BT_ERR("Frame is too long (len %d, expected len %d)",
+ skb->len, len);
+ l2cap_conn_unreliable(conn, ECOMM);
+ goto drop;
+ }
+
+ sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
+
+ if (sk && l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) {
+ BT_ERR("Frame exceeding recv MTU (len %d, MTU %d)",
+ len, l2cap_pi(sk)->imtu);
+ bh_unlock_sock(sk);
+ l2cap_conn_unreliable(conn, ECOMM);
+ goto drop;
+ }
+
+ if (sk)
+ bh_unlock_sock(sk);
+
+ /* Allocate skb for the complete frame (with header) */
+ conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
+ if (!conn->rx_skb)
+ goto drop;
+
+ skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
+ skb->len);
+ conn->rx_len = len - skb->len;
+ } else {
+ BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
+
+ if (!conn->rx_len) {
+ BT_ERR("Unexpected continuation frame (len %d)", skb->len);
+ l2cap_conn_unreliable(conn, ECOMM);
+ goto drop;
+ }
+
+ if (skb->len > conn->rx_len) {
+ BT_ERR("Fragment is too long (len %d, expected %d)",
+ skb->len, conn->rx_len);
+ kfree_skb(conn->rx_skb);
+ conn->rx_skb = NULL;
+ conn->rx_len = 0;
+ l2cap_conn_unreliable(conn, ECOMM);
+ goto drop;
+ }
+
+ skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
+ skb->len);
+ conn->rx_len -= skb->len;
+
+ if (!conn->rx_len) {
+ /* Complete frame received */
+ l2cap_recv_frame(conn, conn->rx_skb);
+ conn->rx_skb = NULL;
+ }
+ }
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int l2cap_debugfs_show(struct seq_file *f, void *p)
+{
+ struct sock *sk;
+ struct hlist_node *node;
+
+ read_lock_bh(&l2cap_sk_list.lock);
+
+ sk_for_each(sk, node, &l2cap_sk_list.head) {
+ struct l2cap_pinfo *pi = l2cap_pi(sk);
+
+ seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
+ batostr(&bt_sk(sk)->src),
+ batostr(&bt_sk(sk)->dst),
+ sk->sk_state, __le16_to_cpu(pi->psm),
+ pi->scid, pi->dcid,
+ pi->imtu, pi->omtu, pi->sec_level);
+ }
+
+ read_unlock_bh(&l2cap_sk_list.lock);
+
+ return 0;
+}
+
+static int l2cap_debugfs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, l2cap_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations l2cap_debugfs_fops = {
+ .open = l2cap_debugfs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static struct dentry *l2cap_debugfs;
+
+static const struct proto_ops l2cap_sock_ops = {
+ .family = PF_BLUETOOTH,
+ .owner = THIS_MODULE,
+ .release = l2cap_sock_release,
+ .bind = l2cap_sock_bind,
+ .connect = l2cap_sock_connect,
+ .listen = l2cap_sock_listen,
+ .accept = l2cap_sock_accept,
+ .getname = l2cap_sock_getname,
+ .sendmsg = l2cap_sock_sendmsg,
+ .recvmsg = l2cap_sock_recvmsg,
+ .poll = bt_sock_poll,
+ .ioctl = bt_sock_ioctl,
+ .mmap = sock_no_mmap,
+ .socketpair = sock_no_socketpair,
+ .shutdown = l2cap_sock_shutdown,
+ .setsockopt = l2cap_sock_setsockopt,
+ .getsockopt = l2cap_sock_getsockopt
+};
+
+static const struct net_proto_family l2cap_sock_family_ops = {
+ .family = PF_BLUETOOTH,
+ .owner = THIS_MODULE,
+ .create = l2cap_sock_create,
+};
+
+static struct hci_proto l2cap_hci_proto = {
+ .name = "L2CAP",
+ .id = HCI_PROTO_L2CAP,
+ .connect_ind = l2cap_connect_ind,
+ .connect_cfm = l2cap_connect_cfm,
+ .disconn_ind = l2cap_disconn_ind,
+ .disconn_cfm = l2cap_disconn_cfm,
+ .security_cfm = l2cap_security_cfm,
+ .recv_acldata = l2cap_recv_acldata
+};
+
+static int __init l2cap_init(void)
+{
+ int err;
+
+ err = proto_register(&l2cap_proto, 0);
+ if (err < 0)
+ return err;
+
+ _busy_wq = create_singlethread_workqueue("l2cap");
+ if (!_busy_wq) {
+ proto_unregister(&l2cap_proto);
+ return -ENOMEM;
+ }
+
+ err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
+ if (err < 0) {
+ BT_ERR("L2CAP socket registration failed");
+ goto error;
+ }
+
+ err = hci_register_proto(&l2cap_hci_proto);
+ if (err < 0) {
+ BT_ERR("L2CAP protocol registration failed");
+ bt_sock_unregister(BTPROTO_L2CAP);
+ goto error;
+ }
+
+ if (bt_debugfs) {
+ l2cap_debugfs = debugfs_create_file("l2cap", 0444,
+ bt_debugfs, NULL, &l2cap_debugfs_fops);
+ if (!l2cap_debugfs)
+ BT_ERR("Failed to create L2CAP debug file");
+ }
+
+ BT_INFO("L2CAP ver %s", VERSION);
+ BT_INFO("L2CAP socket layer initialized");
+
+ return 0;
+
+error:
+ destroy_workqueue(_busy_wq);
+ proto_unregister(&l2cap_proto);
+ return err;
+}
+
+static void __exit l2cap_exit(void)
+{
+ debugfs_remove(l2cap_debugfs);
+
+ flush_workqueue(_busy_wq);
+ destroy_workqueue(_busy_wq);
+
+ if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
+ BT_ERR("L2CAP socket unregistration failed");
+
+ if (hci_unregister_proto(&l2cap_hci_proto) < 0)
+ BT_ERR("L2CAP protocol unregistration failed");
+
+ proto_unregister(&l2cap_proto);
+}
+
+void l2cap_load(void)
+{
+ /* Dummy function to trigger automatic L2CAP module loading by
+ * other modules that use L2CAP sockets but don't use any other
+ * symbols from it. */
+}
+EXPORT_SYMBOL(l2cap_load);
+
+module_init(l2cap_init);
+module_exit(l2cap_exit);
+
+module_param(disable_ertm, bool, 0644);
+MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
+
+MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
+MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("bt-proto-0");
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff