1 /*
2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18 enum llcp_state {
19 LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
20 LLCP_CONNECTING,
21 LLCP_DISCONNECTING,
22 LLCP_CLOSED,
23 LLCP_BOUND,
24 LLCP_LISTEN,
25 };
26
27 #define LLCP_DEFAULT_LTO 100
28 #define LLCP_DEFAULT_RW 1
29 #define LLCP_DEFAULT_MIU 128
30
31 #define LLCP_MAX_LTO 0xff
32 #define LLCP_MAX_RW 15
33 #define LLCP_MAX_MIUX 0x7ff
34 #define LLCP_MAX_MIU (LLCP_MAX_MIUX + 128)
35
36 #define LLCP_WKS_NUM_SAP 16
37 #define LLCP_SDP_NUM_SAP 16
38 #define LLCP_LOCAL_NUM_SAP 32
39 #define LLCP_LOCAL_SAP_OFFSET (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP)
40 #define LLCP_MAX_SAP (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP + LLCP_LOCAL_NUM_SAP)
41 #define LLCP_SDP_UNBOUND (LLCP_MAX_SAP + 1)
42
43 struct nfc_llcp_sock;
44
45 struct llcp_sock_list {
46 struct hlist_head head;
47 rwlock_t lock;
48 };
49
50 struct nfc_llcp_sdp_tlv {
51 u8 *tlv;
52 u8 tlv_len;
53
54 char *uri;
55 u8 tid;
56 u8 sap;
57
58 unsigned long time;
59
60 struct hlist_node node;
61 };
62
63 struct nfc_llcp_local {
64 struct list_head list;
65 struct nfc_dev *dev;
66
67 struct kref ref;
68
69 struct mutex sdp_lock;
70
71 struct timer_list link_timer;
72 struct sk_buff_head tx_queue;
73 struct work_struct tx_work;
74 struct work_struct rx_work;
75 struct sk_buff *rx_pending;
76 struct work_struct timeout_work;
77
78 u32 target_idx;
79 u8 rf_mode;
80 u8 comm_mode;
81 u8 lto;
82 u8 rw;
83 __be16 miux;
84 unsigned long local_wks; /* Well known services */
85 unsigned long local_sdp; /* Local services */
86 unsigned long local_sap; /* Local SAPs, not available for discovery */
87 atomic_t local_sdp_cnt[LLCP_SDP_NUM_SAP];
88
89 /* local */
90 u8 gb[NFC_MAX_GT_LEN];
91 u8 gb_len;
92
93 /* remote */
94 u8 remote_gb[NFC_MAX_GT_LEN];
95 u8 remote_gb_len;
96
97 u8 remote_version;
98 u16 remote_miu;
99 u16 remote_lto;
100 u8 remote_opt;
101 u16 remote_wks;
102
103 struct mutex sdreq_lock;
104 struct hlist_head pending_sdreqs;
105 struct timer_list sdreq_timer;
106 struct work_struct sdreq_timeout_work;
107 u8 sdreq_next_tid;
108
109 /* sockets array */
110 struct llcp_sock_list sockets;
111 struct llcp_sock_list connecting_sockets;
112 struct llcp_sock_list raw_sockets;
113 };
114
115 struct nfc_llcp_sock {
116 struct sock sk;
117 struct nfc_dev *dev;
118 struct nfc_llcp_local *local;
119 u32 target_idx;
120 u32 nfc_protocol;
121
122 /* Link parameters */
123 u8 ssap;
124 u8 dsap;
125 char *service_name;
126 size_t service_name_len;
127 u8 rw;
128 __be16 miux;
129
130
131 /* Remote link parameters */
132 u8 remote_rw;
133 u16 remote_miu;
134
135 /* Link variables */
136 u8 send_n;
137 u8 send_ack_n;
138 u8 recv_n;
139 u8 recv_ack_n;
140
141 /* Is the remote peer ready to receive */
142 u8 remote_ready;
143
144 /* Reserved source SAP */
145 u8 reserved_ssap;
146
147 struct sk_buff_head tx_queue;
148 struct sk_buff_head tx_pending_queue;
149
150 struct list_head accept_queue;
151 struct sock *parent;
152 };
153
154 struct nfc_llcp_ui_cb {
155 __u8 dsap;
156 __u8 ssap;
157 };
158
159 #define nfc_llcp_ui_skb_cb(__skb) ((struct nfc_llcp_ui_cb *)&((__skb)->cb[0]))
160
161 #define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
162 #define nfc_llcp_dev(sk) (nfc_llcp_sock((sk))->dev)
163
164 #define LLCP_HEADER_SIZE 2
165 #define LLCP_SEQUENCE_SIZE 1
166 #define LLCP_AGF_PDU_HEADER_SIZE 2
167
168 /* LLCP versions: 1.1 is 1.0 plus SDP */
169 #define LLCP_VERSION_10 0x10
170 #define LLCP_VERSION_11 0x11
171
172 /* LLCP PDU types */
173 #define LLCP_PDU_SYMM 0x0
174 #define LLCP_PDU_PAX 0x1
175 #define LLCP_PDU_AGF 0x2
176 #define LLCP_PDU_UI 0x3
177 #define LLCP_PDU_CONNECT 0x4
178 #define LLCP_PDU_DISC 0x5
179 #define LLCP_PDU_CC 0x6
180 #define LLCP_PDU_DM 0x7
181 #define LLCP_PDU_FRMR 0x8
182 #define LLCP_PDU_SNL 0x9
183 #define LLCP_PDU_I 0xc
184 #define LLCP_PDU_RR 0xd
185 #define LLCP_PDU_RNR 0xe
186
187 /* Parameters TLV types */
188 #define LLCP_TLV_VERSION 0x1
189 #define LLCP_TLV_MIUX 0x2
190 #define LLCP_TLV_WKS 0x3
191 #define LLCP_TLV_LTO 0x4
192 #define LLCP_TLV_RW 0x5
193 #define LLCP_TLV_SN 0x6
194 #define LLCP_TLV_OPT 0x7
195 #define LLCP_TLV_SDREQ 0x8
196 #define LLCP_TLV_SDRES 0x9
197 #define LLCP_TLV_MAX 0xa
198
199 /* Well known LLCP SAP */
200 #define LLCP_SAP_SDP 0x1
201 #define LLCP_SAP_IP 0x2
202 #define LLCP_SAP_OBEX 0x3
203 #define LLCP_SAP_SNEP 0x4
204 #define LLCP_SAP_MAX 0xff
205
206 /* Disconnection reason code */
207 #define LLCP_DM_DISC 0x00
208 #define LLCP_DM_NOCONN 0x01
209 #define LLCP_DM_NOBOUND 0x02
210 #define LLCP_DM_REJ 0x03
211
212
213 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
214 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
215 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock);
216 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
217 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
218 int nfc_llcp_local_put(struct nfc_llcp_local *local);
219 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
220 struct nfc_llcp_sock *sock);
221 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
222 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
223 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
224 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
225 struct sk_buff *skb, u8 direction);
226
227 /* Sock API */
228 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern);
229 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
230 void nfc_llcp_accept_unlink(struct sock *sk);
231 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
232 struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
233
234 /* TLV API */
235 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
236 u8 *tlv_array, u16 tlv_array_len);
237 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
238 u8 *tlv_array, u16 tlv_array_len);
239
240 /* Commands API */
241 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
242 u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
243 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap);
244 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
245 size_t uri_len);
246 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp);
247 void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head);
248 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
249 int nfc_llcp_send_symm(struct nfc_dev *dev);
250 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
251 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
252 int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
253 struct hlist_head *tlv_list, size_t tlvs_len);
254 int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
255 struct hlist_head *tlv_list, size_t tlvs_len);
256 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
257 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
258 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
259 struct msghdr *msg, size_t len);
260 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
261 struct msghdr *msg, size_t len);
262 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
263
264 /* Socket API */
265 int __init nfc_llcp_sock_init(void);
266 void nfc_llcp_sock_exit(void);
267
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