| /* |
| BlueZ - Bluetooth protocol stack for Linux |
| Copyright (C) 2000-2001 Qualcomm Incorporated |
| |
| 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 "2.14" |
| |
| #ifdef CONFIG_BT_L2CAP_EXT_FEATURES |
| static int enable_ertm = 1; |
| #else |
| static int enable_ertm = 0; |
| #endif |
| static int max_transmit = L2CAP_DEFAULT_MAX_TX; |
| static int tx_window = L2CAP_DEFAULT_TX_WINDOW; |
| |
| 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 struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
| u8 code, u8 ident, u16 dlen, void *data); |
| |
| /* ---- L2CAP timers ---- */ |
| 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 (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); |
| } |
| |
| 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); |
| } |
| |
| /* ---- 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); |
| } |
| |
| /* Service level security */ |
| static inline int l2cap_check_security(struct sock *sk) |
| { |
| struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
| __u8 auth_type; |
| |
| if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
| if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
| auth_type = HCI_AT_NO_BONDING_MITM; |
| else |
| auth_type = HCI_AT_NO_BONDING; |
| |
| if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) |
| l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
| } else { |
| switch (l2cap_pi(sk)->sec_level) { |
| case BT_SECURITY_HIGH: |
| auth_type = HCI_AT_GENERAL_BONDING_MITM; |
| break; |
| case BT_SECURITY_MEDIUM: |
| auth_type = HCI_AT_GENERAL_BONDING; |
| break; |
| default: |
| auth_type = HCI_AT_NO_BONDING; |
| break; |
| } |
| } |
| |
| 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); |
| |
| BT_DBG("code 0x%2.2x", code); |
| |
| if (!skb) |
| return; |
| |
| hci_send_acl(conn->hcon, skb, 0); |
| } |
| |
| 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; |
| int count, hlen = L2CAP_HDR_SIZE + 2; |
| |
| 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)); |
| } |
| |
| hci_send_acl(pi->conn->hcon, skb, 0); |
| } |
| |
| 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 void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk) |
| { |
| struct l2cap_disconn_req req; |
| |
| 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); |
| } |
| |
| /* ---- L2CAP connections ---- */ |
| static void l2cap_conn_start(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) { |
| bh_unlock_sock(sk); |
| continue; |
| } |
| |
| if (sk->sk_state == BT_CONNECT) { |
| 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 if (sk->sk_state == BT_CONNECT2) { |
| struct l2cap_conn_rsp rsp; |
| 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); |
| } |
| |
| bh_unlock_sock(sk); |
| } |
| |
| read_unlock(&l->lock); |
| } |
| |
| 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; |
| |
| 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; |
| } |
| } |
| return node ? sk : sk1; |
| } |
| |
| /* Find socket with given address (psm, src). |
| * Returns locked socket */ |
| static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
| { |
| struct sock *s; |
| read_lock(&l2cap_sk_list.lock); |
| s = __l2cap_get_sock_by_psm(state, psm, src); |
| if (s) |
| bh_lock_sock(s); |
| read_unlock(&l2cap_sk_list.lock); |
| return s; |
| } |
| |
| 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; |
| |
| sk->sk_state = BT_DISCONN; |
| l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
| l2cap_send_disconn_req(conn, sk); |
| } 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; |
| |
| 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->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; |
| } else { |
| pi->imtu = L2CAP_DEFAULT_MTU; |
| pi->omtu = 0; |
| if (enable_ertm && sk->sk_type == SOCK_STREAM) |
| pi->mode = L2CAP_MODE_ERTM; |
| else |
| pi->mode = L2CAP_MODE_BASIC; |
| pi->max_tx = max_transmit; |
| pi->fcs = L2CAP_FCS_CRC16; |
| pi->tx_win = tx_window; |
| pi->sec_level = BT_SECURITY_LOW; |
| pi->role_switch = 0; |
| pi->force_reliable = 0; |
| } |
| |
| /* 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 && __le16_to_cpu(la.l2_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; |
| |
| if (sk->sk_type == SOCK_RAW) { |
| switch (l2cap_pi(sk)->sec_level) { |
| case BT_SECURITY_HIGH: |
| auth_type = HCI_AT_DEDICATED_BONDING_MITM; |
| break; |
| case BT_SECURITY_MEDIUM: |
| auth_type = HCI_AT_DEDICATED_BONDING; |
| break; |
| default: |
| auth_type = HCI_AT_NO_BONDING; |
| break; |
| } |
| } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
| if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
| auth_type = HCI_AT_NO_BONDING_MITM; |
| else |
| auth_type = HCI_AT_NO_BONDING; |
| |
| if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) |
| l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
| } else { |
| switch (l2cap_pi(sk)->sec_level) { |
| case BT_SECURITY_HIGH: |
| auth_type = HCI_AT_GENERAL_BONDING_MITM; |
| break; |
| case BT_SECURITY_MEDIUM: |
| auth_type = HCI_AT_GENERAL_BONDING; |
| break; |
| default: |
| auth_type = HCI_AT_NO_BONDING; |
| break; |
| } |
| } |
| |
| 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); |
| 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 (enable_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 */ |
| goto done; |
| |
| case BT_OPEN: |
| case BT_BOUND: |
| /* Can connect */ |
| break; |
| |
| default: |
| err = -EBADFD; |
| 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 (enable_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; |
| |
| 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); |
| 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; |
| |
| 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); |
| |
| BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); |
| |
| hci_send_acl(pi->conn->hcon, skb, 0); |
| } |
| |
| static int l2cap_streaming_send(struct sock *sk) |
| { |
| struct sk_buff *skb, *tx_skb; |
| struct l2cap_pinfo *pi = l2cap_pi(sk); |
| u16 control, fcs; |
| |
| while ((skb = sk->sk_send_head)) { |
| tx_skb = skb_clone(skb, GFP_ATOMIC); |
| |
| control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
| control |= 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 *)tx_skb->data, tx_skb->len - 2); |
| put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); |
| } |
| |
| l2cap_do_send(sk, tx_skb); |
| |
| pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; |
| |
| 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); |
| |
| skb = skb_dequeue(TX_QUEUE(sk)); |
| kfree_skb(skb); |
| } |
| return 0; |
| } |
| |
| 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); |
| return; |
| } |
| |
| tx_skb = skb_clone(skb, GFP_ATOMIC); |
| bt_cb(skb)->retries++; |
| control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
| 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 (pi->conn_state & L2CAP_CONN_WAIT_F) |
| return 0; |
| |
| while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) && |
| !(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) { |
| |
| if (pi->remote_max_tx && |
| bt_cb(skb)->retries == pi->remote_max_tx) { |
| l2cap_send_disconn_req(pi->conn, sk); |
| break; |
| } |
| |
| 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) |
| | (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; |
| |
| spin_lock_bh(&pi->send_lock); |
| |
| 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); |
| |
| spin_unlock_bh(&pi->send_lock); |
| |
| return ret; |
| } |
| |
| static void l2cap_send_ack(struct l2cap_pinfo *pi) |
| { |
| struct sock *sk = (struct sock *)pi; |
| u16 control = 0; |
| int nframes; |
| |
| 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; |
| } |
| |
| spin_lock_bh(&pi->send_lock); |
| nframes = l2cap_ertm_send(sk); |
| spin_unlock_bh(&pi->send_lock); |
| |
| if (nframes > 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 -EFAULT; |
| 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(-ENOMEM); |
| |
| /* 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(-ENOMEM); |
| |
| /* 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(-ENOMEM); |
| |
| /* 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)); |
| spin_lock_bh(&pi->send_lock); |
| if (sk->sk_send_head == NULL) |
| sk->sk_send_head = sar_queue.next; |
| spin_unlock_bh(&pi->send_lock); |
| |
| 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 = -EINVAL; |
| 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 (pi->mode == L2CAP_MODE_ERTM) |
| spin_lock_bh(&pi->send_lock); |
| |
| if (sk->sk_send_head == NULL) |
| sk->sk_send_head = skb; |
| |
| if (pi->mode == L2CAP_MODE_ERTM) |
| spin_unlock_bh(&pi->send_lock); |
| } 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) { |
| err = l2cap_streaming_send(sk); |
| } else { |
| spin_lock_bh(&pi->send_lock); |
| err = l2cap_ertm_send(sk); |
| spin_unlock_bh(&pi->send_lock); |
| } |
| |
| if (err >= 0) |
| err = len; |
| break; |
| |
| default: |
| BT_DBG("bad state %1.1x", pi->mode); |
| err = -EINVAL; |
| } |
| |
| 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; |
| |
| 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); |
| |
| release_sock(sk); |
| return 0; |
| } |
| |
| release_sock(sk); |
| |
| 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: |
| 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; |
| } |
| |
| l2cap_pi(sk)->mode = opts.mode; |
| switch (l2cap_pi(sk)->mode) { |
| case L2CAP_MODE_BASIC: |
| break; |
| case L2CAP_MODE_ERTM: |
| case L2CAP_MODE_STREAMING: |
| if (enable_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; |
| |
| 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; |
| |
| 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); |
| } |
| 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 = __le16_to_cpu(*((__le16 *) opt->val)); |
| break; |
| |
| case 4: |
| *val = __le32_to_cpu(*((__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: |
| *((__le16 *) opt->val) = cpu_to_le16(val); |
| break; |
| |
| case 4: |
| *((__le32 *) opt->val) = cpu_to_le32(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)); |
| spin_lock_init(&l2cap_pi(sk)->send_lock); |
| |
| INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); |
| } |
| |
| static int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
| { |
| u32 local_feat_mask = l2cap_feat_mask; |
| if (enable_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 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: |
| pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; |
| if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) |
| l2cap_send_disconn_req(pi->conn, sk); |
| break; |
| default: |
| pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); |
| break; |
| } |
| |
| done: |
| switch (pi->mode) { |
| case L2CAP_MODE_BASIC: |
| if (pi->imtu != L2CAP_DEFAULT_MTU) |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); |
| 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) |
| goto done; |
| |
| switch (pi->mode) { |
| case L2CAP_MODE_STREAMING: |
| case L2CAP_MODE_ERTM: |
| pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; |
| if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) |
| return -ECONNREFUSED; |
| break; |
| default: |
| pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); |
| 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 (rfc.max_pdu_size > pi->conn->mtu - 10) |
| rfc.max_pdu_size = le16_to_cpu(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 (rfc.max_pdu_size > pi->conn->mtu - 10) |
| rfc.max_pdu_size = le16_to_cpu(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->omtu = L2CAP_DEFAULT_MIN_MTU; |
| } else |
| pi->omtu = val; |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); |
| 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->mode = rfc.mode; |
| pi->fcs = 0; |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, |
| sizeof(rfc), (unsigned long) &rfc); |
| break; |
| } |
| } |
| |
| if (*result == L2CAP_CONF_SUCCESS) { |
| switch (rfc.mode) { |
| case L2CAP_MODE_ERTM: |
| pi->remote_tx_win = rfc.txwin_size; |
| 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->remote_tx_win = rfc.txwin_size; |
| 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 *sk, *parent; |
| 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; |
| } |
| |
| /* 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); |
| } |
| |
| 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 0; |
| } else { |
| sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
| if (!sk) |
| return 0; |
| } |
| |
| 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_REQ_SENT; |
| l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
| |
| 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: |
| l2cap_chan_del(sk, ECONNREFUSED); |
| break; |
| } |
| |
| bh_unlock_sock(sk); |
| return 0; |
| } |
| |
| 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_DISCONN) |
| 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); |
| 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) { |
| if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
| l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) |
| l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
| |
| 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_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) |
| |