net/nfc/llcp.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * Copyright (C) 2011  Intel Corporation. All rights reserved.
  */

 enum llcp_state {
 	LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
 	LLCP_CONNECTING,
 	LLCP_DISCONNECTING,
 	LLCP_CLOSED,
 	LLCP_BOUND,
 	LLCP_LISTEN,
 };

 #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
 #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)
 #define LLCP_SDP_UNBOUND   (LLCP_MAX_SAP + 1)

 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
 #define LLCP_SEQUENCE_SIZE 1
 #define LLCP_AGF_PDU_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,
 			  const u8 *tlv_array, u16 tlv_array_len);
 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
 				  const 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, const 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, const 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);
	/* SPDX-License-Identifier: GPL-2.0-or-later */
	/*
	* Copyright (C) 2011 Intel Corporation. All rights reserved.
	*/

	enum llcp_state {
	LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
	LLCP_CONNECTING,
	LLCP_DISCONNECTING,
	LLCP_CLOSED,
	LLCP_BOUND,
	LLCP_LISTEN,
	};

	#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
	#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)
	#define LLCP_SDP_UNBOUND (LLCP_MAX_SAP + 1)

	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
	#define LLCP_SEQUENCE_SIZE 1
	#define LLCP_AGF_PDU_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,
	const u8 *tlv_array, u16 tlv_array_len);
	int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
	const 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, const 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, const 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);