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