cregit-Linux how code gets into the kernel

Release 4.8 net/nfc/llcp.h

Directory: net/nfc
 * 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
 * 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, see <>.

enum llcp_state {
LLCP_CONNECTED = 1, /* wait_for_packet() wants that */

#define LLCP_DEFAULT_LTO 100

#define LLCP_DEFAULT_RW  1

#define LLCP_DEFAULT_MIU 128

#define LLCP_MAX_LTO  0xff

#define LLCP_MAX_RW   15

#define LLCP_MAX_MIUX 0x7ff

#define LLCP_MAX_MIU (LLCP_MAX_MIUX + 128)

#define LLCP_WKS_NUM_SAP   16

#define LLCP_SDP_NUM_SAP   16





struct nfc_llcp_sock;

struct llcp_sock_list {
struct hlist_head head;
rwlock_t          lock;

struct nfc_llcp_sdp_tlv {
u8 *tlv;
u8 tlv_len;

char *uri;
u8 tid;
u8 sap;

unsigned long time;

struct hlist_node node;

struct nfc_llcp_local {
struct list_head list;
struct nfc_dev *dev;

struct kref ref;

struct mutex sdp_lock;

struct timer_list link_timer;
struct sk_buff_head tx_queue;
struct work_struct	 tx_work;
struct work_struct	 rx_work;
struct sk_buff *rx_pending;
struct work_struct	 timeout_work;

u32 target_idx;
u8 rf_mode;
u8 comm_mode;
u8 lto;
u8 rw;
__be16 miux;
unsigned long local_wks;      /* Well known services */
unsigned long local_sdp;      /* Local services  */
unsigned long local_sap; /* Local SAPs, not available for discovery */
atomic_t local_sdp_cnt[LLCP_SDP_NUM_SAP];

	/* 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;

struct mutex sdreq_lock;
struct hlist_head pending_sdreqs;
struct timer_list sdreq_timer;
struct work_struct sdreq_timeout_work;
u8 sdreq_next_tid;

	/* sockets array */
struct llcp_sock_list sockets;
struct llcp_sock_list connecting_sockets;
struct llcp_sock_list raw_sockets;

struct nfc_llcp_sock {
struct sock sk;
struct nfc_dev *dev;
struct nfc_llcp_local *local;
u32 target_idx;
u32 nfc_protocol;

	/* Link parameters */
u8 ssap;
u8 dsap;
char *service_name;
size_t service_name_len;
u8 rw;
__be16 miux;

	/* Remote link parameters */
u8 remote_rw;
u16 remote_miu;

	/* 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;

	/* Reserved source SAP */
u8 reserved_ssap;

struct sk_buff_head tx_queue;
struct sk_buff_head tx_pending_queue;

struct list_head accept_queue;
struct sock *parent;

struct nfc_llcp_ui_cb {
__u8 dsap;
__u8 ssap;

#define nfc_llcp_ui_skb_cb(__skb) ((struct nfc_llcp_ui_cb *)&((__skb)->cb[0]))

#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



/* 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

void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock);
struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
int nfc_llcp_local_put(struct nfc_llcp_local *local);
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);
int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
			       struct sk_buff *skb, u8 direction);

/* Sock API */
struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern);
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_gb_tlv(struct nfc_llcp_local *local,
			  u8 *tlv_array, u16 tlv_array_len);
int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
				  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);
struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap);
struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
						  size_t uri_len);
void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp);
void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head);
void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
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_snl_sdres(struct nfc_llcp_local *local,
			    struct hlist_head *tlv_list, size_t tlvs_len);
int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
			    struct hlist_head *tlv_list, size_t tlvs_len);
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);
int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
			  struct msghdr *msg, size_t len);
int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
			   struct msghdr *msg, size_t len);
int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);

/* Socket API */
int __init nfc_llcp_sock_init(void);
void nfc_llcp_sock_exit(void);

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Directory: net/nfc
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