1/* SPDX-License-Identifier: GPL-2.0-or-later */
  2/*
  3 * Copyright (C) 2011  Intel Corporation. All rights reserved.
  4 */
  5
  6enum llcp_state {
  7	LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
  8	LLCP_CONNECTING,
  9	LLCP_DISCONNECTING,
 10	LLCP_CLOSED,
 11	LLCP_BOUND,
 12	LLCP_LISTEN,
 13};
 14
 15#define LLCP_DEFAULT_LTO 100
 16#define LLCP_DEFAULT_RW  1
 17#define LLCP_DEFAULT_MIU 128
 18
 19#define LLCP_MAX_LTO  0xff
 20#define LLCP_MAX_RW   15
 21#define LLCP_MAX_MIUX 0x7ff
 22#define LLCP_MAX_MIU (LLCP_MAX_MIUX + 128)
 23
 24#define LLCP_WKS_NUM_SAP   16
 25#define LLCP_SDP_NUM_SAP   16
 26#define LLCP_LOCAL_NUM_SAP 32
 27#define LLCP_LOCAL_SAP_OFFSET (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP)
 28#define LLCP_MAX_SAP (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP + LLCP_LOCAL_NUM_SAP)
 29#define LLCP_SDP_UNBOUND   (LLCP_MAX_SAP + 1)
 30
 31struct nfc_llcp_sock;
 32
 33struct llcp_sock_list {
 34	struct hlist_head head;
 35	rwlock_t          lock;
 36};
 37
 38struct nfc_llcp_sdp_tlv {
 39	u8 *tlv;
 40	u8 tlv_len;
 41
 42	char *uri;
 43	u8 tid;
 44	u8 sap;
 45
 46	unsigned long time;
 47
 48	struct hlist_node node;
 49};
 50
 51struct nfc_llcp_local {
 52	struct list_head list;
 53	struct nfc_dev *dev;
 54
 55	struct kref ref;
 56
 57	struct mutex sdp_lock;
 58
 59	struct timer_list link_timer;
 60	struct sk_buff_head tx_queue;
 61	struct work_struct	 tx_work;
 62	struct work_struct	 rx_work;
 63	struct sk_buff *rx_pending;
 64	struct work_struct	 timeout_work;
 65
 66	u32 target_idx;
 67	u8 rf_mode;
 68	u8 comm_mode;
 69	u8 lto;
 70	u8 rw;
 71	__be16 miux;
 72	unsigned long local_wks;      /* Well known services */
 73	unsigned long local_sdp;      /* Local services  */
 74	unsigned long local_sap; /* Local SAPs, not available for discovery */
 75	atomic_t local_sdp_cnt[LLCP_SDP_NUM_SAP];
 76
 77	/* local */
 78	u8 gb[NFC_MAX_GT_LEN];
 79	u8 gb_len;
 80
 81	/* remote */
 82	u8 remote_gb[NFC_MAX_GT_LEN];
 83	u8 remote_gb_len;
 84
 85	u8  remote_version;
 86	u16 remote_miu;
 87	u16 remote_lto;
 88	u8  remote_opt;
 89	u16 remote_wks;
 90
 91	struct mutex sdreq_lock;
 92	struct hlist_head pending_sdreqs;
 93	struct timer_list sdreq_timer;
 94	struct work_struct sdreq_timeout_work;
 95	u8 sdreq_next_tid;
 96
 97	/* sockets array */
 98	struct llcp_sock_list sockets;
 99	struct llcp_sock_list connecting_sockets;
100	struct llcp_sock_list raw_sockets;
101};
102
103struct nfc_llcp_sock {
104	struct sock sk;
105	struct nfc_dev *dev;
106	struct nfc_llcp_local *local;
107	u32 target_idx;
108	u32 nfc_protocol;
109
110	/* Link parameters */
111	u8 ssap;
112	u8 dsap;
113	char *service_name;
114	size_t service_name_len;
115	u8 rw;
116	__be16 miux;
117
118
119	/* Remote link parameters */
120	u8 remote_rw;
121	u16 remote_miu;
122
123	/* Link variables */
124	u8 send_n;
125	u8 send_ack_n;
126	u8 recv_n;
127	u8 recv_ack_n;
128
129	/* Is the remote peer ready to receive */
130	u8 remote_ready;
131
132	/* Reserved source SAP */
133	u8 reserved_ssap;
134
135	struct sk_buff_head tx_queue;
136	struct sk_buff_head tx_pending_queue;
137
138	struct list_head accept_queue;
139	struct sock *parent;
140};
141
142struct nfc_llcp_ui_cb {
143	__u8 dsap;
144	__u8 ssap;
145};
146
147#define nfc_llcp_ui_skb_cb(__skb) ((struct nfc_llcp_ui_cb *)&((__skb)->cb[0]))
148
149#define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
150#define nfc_llcp_dev(sk)  (nfc_llcp_sock((sk))->dev)
151
152#define LLCP_HEADER_SIZE   2
153#define LLCP_SEQUENCE_SIZE 1
154#define LLCP_AGF_PDU_HEADER_SIZE 2
155
156/* LLCP versions: 1.1 is 1.0 plus SDP */
157#define LLCP_VERSION_10 0x10
158#define LLCP_VERSION_11 0x11
159
160/* LLCP PDU types */
161#define LLCP_PDU_SYMM     0x0
162#define LLCP_PDU_PAX      0x1
163#define LLCP_PDU_AGF      0x2
164#define LLCP_PDU_UI       0x3
165#define LLCP_PDU_CONNECT  0x4
166#define LLCP_PDU_DISC     0x5
167#define LLCP_PDU_CC       0x6
168#define LLCP_PDU_DM       0x7
169#define LLCP_PDU_FRMR     0x8
170#define LLCP_PDU_SNL      0x9
171#define LLCP_PDU_I        0xc
172#define LLCP_PDU_RR       0xd
173#define LLCP_PDU_RNR      0xe
174
175/* Parameters TLV types */
176#define LLCP_TLV_VERSION 0x1
177#define LLCP_TLV_MIUX    0x2
178#define LLCP_TLV_WKS     0x3
179#define LLCP_TLV_LTO     0x4
180#define LLCP_TLV_RW      0x5
181#define LLCP_TLV_SN      0x6
182#define LLCP_TLV_OPT     0x7
183#define LLCP_TLV_SDREQ   0x8
184#define LLCP_TLV_SDRES   0x9
185#define LLCP_TLV_MAX     0xa
186
187/* Well known LLCP SAP */
188#define LLCP_SAP_SDP   0x1
189#define LLCP_SAP_IP    0x2
190#define LLCP_SAP_OBEX  0x3
191#define LLCP_SAP_SNEP  0x4
192#define LLCP_SAP_MAX   0xff
193
194/* Disconnection reason code */
195#define LLCP_DM_DISC    0x00
196#define LLCP_DM_NOCONN  0x01
197#define LLCP_DM_NOBOUND 0x02
198#define LLCP_DM_REJ     0x03
199
200
201void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
202void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
203void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock);
204struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
205struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
206int nfc_llcp_local_put(struct nfc_llcp_local *local);
207u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
208			 struct nfc_llcp_sock *sock);
209u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
210void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
211int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
212void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
213			       struct sk_buff *skb, u8 direction);
214
215/* Sock API */
216struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern);
217void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
218void nfc_llcp_accept_unlink(struct sock *sk);
219void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
220struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
221
222/* TLV API */
223int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
224			  u8 *tlv_array, u16 tlv_array_len);
225int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
226				  u8 *tlv_array, u16 tlv_array_len);
227
228/* Commands API */
229void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
230u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
231struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap);
232struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
233						  size_t uri_len);
234void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp);
235void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head);
236void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
237int nfc_llcp_send_symm(struct nfc_dev *dev);
238int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
239int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
240int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
241			    struct hlist_head *tlv_list, size_t tlvs_len);
242int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
243			    struct hlist_head *tlv_list, size_t tlvs_len);
244int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
245int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
246int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
247			  struct msghdr *msg, size_t len);
248int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
249			   struct msghdr *msg, size_t len);
250int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
251
252/* Socket API */
253int __init nfc_llcp_sock_init(void);
254void nfc_llcp_sock_exit(void);