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Some of the qualification tests demand that in case of failures in L2CAP the HCI disconnect should indicate a reason why L2CAP fails. This is a bluntly layer violation since multiple L2CAP connections could be using the same ACL and thus forcing a disconnect reason is not a good idea. To comply with the Bluetooth test specification, the disconnect reason is now stored in the L2CAP connection structure and every time a new L2CAP channel is added it will set back to its default. So only in the case where the L2CAP channel with the disconnect reason is really the last one, it will propagated to the HCI layer. The HCI layer has been extended with a disconnect indication that allows it to ask upper layers for a disconnect reason. The upper layer must not support this callback and in that case it will nicely default to the existing behavior. If an upper layer like L2CAP can provide a disconnect reason that one will be used to disconnect the ACL or SCO link. No modification to the ACL disconnect timeout have been made. So in case of Linux to Linux connection the initiator will disconnect the ACL link before the acceptor side can signal the specific disconnect reason. That is perfectly fine since Linux doesn't make use of this value anyway. The L2CAP layer has a perfect valid error code for rejecting connection due to a security violation. It is unclear why the Bluetooth specification insists on having specific HCI disconnect reason. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
273 lines
5.9 KiB
C
273 lines
5.9 KiB
C
/*
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BlueZ - Bluetooth protocol stack for Linux
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Copyright (C) 2000-2001 Qualcomm Incorporated
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Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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#ifndef __L2CAP_H
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#define __L2CAP_H
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/* L2CAP defaults */
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#define L2CAP_DEFAULT_MTU 672
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#define L2CAP_DEFAULT_FLUSH_TO 0xFFFF
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#define L2CAP_CONN_TIMEOUT (40000) /* 40 seconds */
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#define L2CAP_INFO_TIMEOUT (4000) /* 4 seconds */
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/* L2CAP socket address */
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struct sockaddr_l2 {
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sa_family_t l2_family;
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__le16 l2_psm;
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bdaddr_t l2_bdaddr;
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__le16 l2_cid;
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};
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/* L2CAP socket options */
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#define L2CAP_OPTIONS 0x01
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struct l2cap_options {
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__u16 omtu;
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__u16 imtu;
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__u16 flush_to;
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__u8 mode;
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};
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#define L2CAP_CONNINFO 0x02
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struct l2cap_conninfo {
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__u16 hci_handle;
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__u8 dev_class[3];
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};
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#define L2CAP_LM 0x03
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#define L2CAP_LM_MASTER 0x0001
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#define L2CAP_LM_AUTH 0x0002
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#define L2CAP_LM_ENCRYPT 0x0004
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#define L2CAP_LM_TRUSTED 0x0008
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#define L2CAP_LM_RELIABLE 0x0010
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#define L2CAP_LM_SECURE 0x0020
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/* L2CAP command codes */
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#define L2CAP_COMMAND_REJ 0x01
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#define L2CAP_CONN_REQ 0x02
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#define L2CAP_CONN_RSP 0x03
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#define L2CAP_CONF_REQ 0x04
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#define L2CAP_CONF_RSP 0x05
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#define L2CAP_DISCONN_REQ 0x06
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#define L2CAP_DISCONN_RSP 0x07
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#define L2CAP_ECHO_REQ 0x08
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#define L2CAP_ECHO_RSP 0x09
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#define L2CAP_INFO_REQ 0x0a
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#define L2CAP_INFO_RSP 0x0b
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/* L2CAP structures */
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struct l2cap_hdr {
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__le16 len;
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__le16 cid;
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} __attribute__ ((packed));
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#define L2CAP_HDR_SIZE 4
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struct l2cap_cmd_hdr {
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__u8 code;
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__u8 ident;
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__le16 len;
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} __attribute__ ((packed));
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#define L2CAP_CMD_HDR_SIZE 4
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struct l2cap_cmd_rej {
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__le16 reason;
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} __attribute__ ((packed));
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struct l2cap_conn_req {
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__le16 psm;
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__le16 scid;
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} __attribute__ ((packed));
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struct l2cap_conn_rsp {
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__le16 dcid;
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__le16 scid;
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__le16 result;
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__le16 status;
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} __attribute__ ((packed));
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/* connect result */
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#define L2CAP_CR_SUCCESS 0x0000
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#define L2CAP_CR_PEND 0x0001
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#define L2CAP_CR_BAD_PSM 0x0002
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#define L2CAP_CR_SEC_BLOCK 0x0003
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#define L2CAP_CR_NO_MEM 0x0004
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/* connect status */
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#define L2CAP_CS_NO_INFO 0x0000
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#define L2CAP_CS_AUTHEN_PEND 0x0001
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#define L2CAP_CS_AUTHOR_PEND 0x0002
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struct l2cap_conf_req {
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__le16 dcid;
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__le16 flags;
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__u8 data[0];
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} __attribute__ ((packed));
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struct l2cap_conf_rsp {
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__le16 scid;
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__le16 flags;
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__le16 result;
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__u8 data[0];
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} __attribute__ ((packed));
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#define L2CAP_CONF_SUCCESS 0x0000
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#define L2CAP_CONF_UNACCEPT 0x0001
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#define L2CAP_CONF_REJECT 0x0002
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#define L2CAP_CONF_UNKNOWN 0x0003
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struct l2cap_conf_opt {
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__u8 type;
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__u8 len;
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__u8 val[0];
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} __attribute__ ((packed));
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#define L2CAP_CONF_OPT_SIZE 2
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#define L2CAP_CONF_MTU 0x01
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#define L2CAP_CONF_FLUSH_TO 0x02
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#define L2CAP_CONF_QOS 0x03
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#define L2CAP_CONF_RFC 0x04
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#define L2CAP_CONF_MAX_SIZE 22
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struct l2cap_conf_rfc {
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__u8 mode;
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__u8 txwin_size;
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__u8 max_transmit;
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__le16 retrans_timeout;
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__le16 monitor_timeout;
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__le16 max_pdu_size;
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} __attribute__ ((packed));
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#define L2CAP_MODE_BASIC 0x00
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#define L2CAP_MODE_RETRANS 0x01
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#define L2CAP_MODE_FLOWCTL 0x02
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struct l2cap_disconn_req {
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__le16 dcid;
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__le16 scid;
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} __attribute__ ((packed));
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struct l2cap_disconn_rsp {
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__le16 dcid;
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__le16 scid;
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} __attribute__ ((packed));
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struct l2cap_info_req {
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__le16 type;
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} __attribute__ ((packed));
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struct l2cap_info_rsp {
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__le16 type;
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__le16 result;
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__u8 data[0];
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} __attribute__ ((packed));
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/* info type */
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#define L2CAP_IT_CL_MTU 0x0001
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#define L2CAP_IT_FEAT_MASK 0x0002
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#define L2CAP_IT_FIXED_CHAN 0x0003
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/* info result */
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#define L2CAP_IR_SUCCESS 0x0000
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#define L2CAP_IR_NOTSUPP 0x0001
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/* ----- L2CAP connections ----- */
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struct l2cap_chan_list {
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struct sock *head;
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rwlock_t lock;
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long num;
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};
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struct l2cap_conn {
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struct hci_conn *hcon;
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bdaddr_t *dst;
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bdaddr_t *src;
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unsigned int mtu;
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__u32 feat_mask;
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__u8 info_state;
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__u8 info_ident;
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struct timer_list info_timer;
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spinlock_t lock;
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struct sk_buff *rx_skb;
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__u32 rx_len;
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__u8 rx_ident;
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__u8 tx_ident;
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__u8 disc_reason;
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struct l2cap_chan_list chan_list;
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};
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#define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
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#define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
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#define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
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/* ----- L2CAP channel and socket info ----- */
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#define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
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struct l2cap_pinfo {
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struct bt_sock bt;
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__le16 psm;
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__u16 dcid;
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__u16 scid;
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__u16 imtu;
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__u16 omtu;
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__u16 flush_to;
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__u8 sec_level;
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__u8 role_switch;
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__u8 force_reliable;
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__u8 conf_req[64];
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__u8 conf_len;
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__u8 conf_state;
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__u8 conf_retry;
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__u8 ident;
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__le16 sport;
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struct l2cap_conn *conn;
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struct sock *next_c;
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struct sock *prev_c;
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};
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#define L2CAP_CONF_REQ_SENT 0x01
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#define L2CAP_CONF_INPUT_DONE 0x02
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#define L2CAP_CONF_OUTPUT_DONE 0x04
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#define L2CAP_CONF_CONNECT_PEND 0x80
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#define L2CAP_CONF_MAX_RETRIES 2
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void l2cap_load(void);
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#endif /* __L2CAP_H */
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