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linux/net/nfc/llcp/llcp.h
Samuel Ortiz d646960f79 NFC: Initial LLCP support 
This patch is an initial implementation for the NFC Logical Link Control
protocol. It's also known as NFC peer to peer mode.
This is a basic implementation as it lacks SDP (services Discovery
Protocol), frames aggregation support, and frame rejecion parsing.
Follow up patches will implement those missing features.
This code has been tested against a Nexus S phone implementing LLCP 1.0.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-12-14 14:50:13 -05:00

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/*
* Copyright (C) 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
enum llcp_state {
LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
LLCP_CLOSED,
LLCP_BOUND,
LLCP_LISTEN,
};
#define LLCP_DEFAULT_LTO 100
#define LLCP_DEFAULT_RW 1
#define LLCP_DEFAULT_MIU 128
#define LLCP_WKS_NUM_SAP 16
#define LLCP_SDP_NUM_SAP 16
#define LLCP_LOCAL_NUM_SAP 32
#define LLCP_LOCAL_SAP_OFFSET (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP)
#define LLCP_MAX_SAP (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP + LLCP_LOCAL_NUM_SAP)
struct nfc_llcp_sock;
struct nfc_llcp_local {
struct list_head list;
struct nfc_dev *dev;
struct mutex sdp_lock;
struct mutex socket_lock;
struct timer_list link_timer;
struct sk_buff_head tx_queue;
struct workqueue_struct *tx_wq;
struct work_struct tx_work;
struct workqueue_struct *rx_wq;
struct work_struct rx_work;
struct sk_buff *rx_pending;
struct workqueue_struct *timeout_wq;
struct work_struct timeout_work;
u32 target_idx;
u8 rf_mode;
u8 comm_mode;
unsigned long local_wks; /* Well known services */
unsigned long local_sdp; /* Local services */
unsigned long local_sap; /* Local SAPs, not available for discovery */
/* local */
u8 gb[NFC_MAX_GT_LEN];
u8 gb_len;
/* remote */
u8 remote_gb[NFC_MAX_GT_LEN];
u8 remote_gb_len;
u8 remote_version;
u16 remote_miu;
u16 remote_lto;
u8 remote_opt;
u16 remote_wks;
u8 remote_rw;
/* sockets array */
struct nfc_llcp_sock *sockets[LLCP_MAX_SAP];
};
struct nfc_llcp_sock {
struct sock sk;
struct list_head list;
struct nfc_dev *dev;
struct nfc_llcp_local *local;
u32 target_idx;
u32 nfc_protocol;
u8 ssap;
u8 dsap;
char *service_name;
size_t service_name_len;
/* Link variables */
u8 send_n;
u8 send_ack_n;
u8 recv_n;
u8 recv_ack_n;
/* Is the remote peer ready to receive */
u8 remote_ready;
struct sk_buff_head tx_queue;
struct sk_buff_head tx_pending_queue;
struct sk_buff_head tx_backlog_queue;
struct list_head accept_queue;
struct sock *parent;
};
#define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
#define nfc_llcp_dev(sk) (nfc_llcp_sock((sk))->dev)
#define LLCP_HEADER_SIZE 2
#define LLCP_SEQUENCE_SIZE 1
/* LLCP versions: 1.1 is 1.0 plus SDP */
#define LLCP_VERSION_10 0x10
#define LLCP_VERSION_11 0x11
/* LLCP PDU types */
#define LLCP_PDU_SYMM 0x0
#define LLCP_PDU_PAX 0x1
#define LLCP_PDU_AGF 0x2
#define LLCP_PDU_UI 0x3
#define LLCP_PDU_CONNECT 0x4
#define LLCP_PDU_DISC 0x5
#define LLCP_PDU_CC 0x6
#define LLCP_PDU_DM 0x7
#define LLCP_PDU_FRMR 0x8
#define LLCP_PDU_SNL 0x9
#define LLCP_PDU_I 0xc
#define LLCP_PDU_RR 0xd
#define LLCP_PDU_RNR 0xe
/* Parameters TLV types */
#define LLCP_TLV_VERSION 0x1
#define LLCP_TLV_MIUX 0x2
#define LLCP_TLV_WKS 0x3
#define LLCP_TLV_LTO 0x4
#define LLCP_TLV_RW 0x5
#define LLCP_TLV_SN 0x6
#define LLCP_TLV_OPT 0x7
#define LLCP_TLV_SDREQ 0x8
#define LLCP_TLV_SDRES 0x9
#define LLCP_TLV_MAX 0xa
/* Well known LLCP SAP */
#define LLCP_SAP_SDP 0x1
#define LLCP_SAP_IP 0x2
#define LLCP_SAP_OBEX 0x3
#define LLCP_SAP_SNEP 0x4
#define LLCP_SAP_MAX 0xff
/* Disconnection reason code */
#define LLCP_DM_DISC 0x00
#define LLCP_DM_NOCONN 0x01
#define LLCP_DM_NOBOUND 0x02
#define LLCP_DM_REJ 0x03
struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
struct nfc_llcp_sock *sock);
u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
/* Sock API */
struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);
void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
void nfc_llcp_accept_unlink(struct sock *sk);
void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
/* TLV API */
int nfc_llcp_parse_tlv(struct nfc_llcp_local *local,
u8 *tlv_array, u16 tlv_array_len);
/* Commands API */
void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
int nfc_llcp_disconnect(struct nfc_llcp_sock *sock);
int nfc_llcp_send_symm(struct nfc_dev *dev);
int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
/* Socket API */
int __init nfc_llcp_sock_init(void);
void nfc_llcp_sock_exit(void);
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