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llcp.h
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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, write to the
16  * Free Software Foundation, Inc.,
17  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18  */
19 
20 enum llcp_state {
21  LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
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 
35 #define LLCP_WKS_NUM_SAP 16
36 #define LLCP_SDP_NUM_SAP 16
37 #define LLCP_LOCAL_NUM_SAP 32
38 #define LLCP_LOCAL_SAP_OFFSET (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP)
39 #define LLCP_MAX_SAP (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP + LLCP_LOCAL_NUM_SAP)
40 #define LLCP_SDP_UNBOUND (LLCP_MAX_SAP + 1)
41 
42 struct nfc_llcp_sock;
43 
44 struct llcp_sock_list {
45  struct hlist_head head;
46  rwlock_t lock;
47 };
48 
49 struct nfc_llcp_local {
50  struct list_head list;
51  struct nfc_dev *dev;
52 
53  struct kref ref;
54 
55  struct mutex sdp_lock;
56 
57  struct timer_list link_timer;
58  struct sk_buff_head tx_queue;
59  struct work_struct tx_work;
60  struct work_struct rx_work;
61  struct sk_buff *rx_pending;
62  struct work_struct timeout_work;
63 
64  u32 target_idx;
65  u8 rf_mode;
66  u8 comm_mode;
67  unsigned long local_wks; /* Well known services */
68  unsigned long local_sdp; /* Local services */
69  unsigned long local_sap; /* Local SAPs, not available for discovery */
70  atomic_t local_sdp_cnt[LLCP_SDP_NUM_SAP];
71 
72  /* local */
73  u8 gb[NFC_MAX_GT_LEN];
74  u8 gb_len;
75 
76  /* remote */
77  u8 remote_gb[NFC_MAX_GT_LEN];
78  u8 remote_gb_len;
79 
80  u8 remote_version;
81  u16 remote_miu;
82  u16 remote_lto;
83  u8 remote_opt;
84  u16 remote_wks;
85 
86  /* sockets array */
87  struct llcp_sock_list sockets;
88  struct llcp_sock_list connecting_sockets;
89  struct llcp_sock_list raw_sockets;
90 };
91 
92 struct nfc_llcp_sock {
93  struct sock sk;
94  struct nfc_dev *dev;
95  struct nfc_llcp_local *local;
96  u32 target_idx;
97  u32 nfc_protocol;
98 
99  /* Link parameters */
100  u8 ssap;
101  u8 dsap;
102  char *service_name;
103  size_t service_name_len;
104  u8 rw;
105  u16 miu;
106 
107  /* Link variables */
108  u8 send_n;
109  u8 send_ack_n;
110  u8 recv_n;
111  u8 recv_ack_n;
112 
113  /* Is the remote peer ready to receive */
114  u8 remote_ready;
115 
116  /* Reserved source SAP */
117  u8 reserved_ssap;
118 
119  struct sk_buff_head tx_queue;
120  struct sk_buff_head tx_pending_queue;
121  struct sk_buff_head tx_backlog_queue;
122 
123  struct list_head accept_queue;
124  struct sock *parent;
125 };
126 
127 #define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
128 #define nfc_llcp_dev(sk) (nfc_llcp_sock((sk))->dev)
129 
130 #define LLCP_HEADER_SIZE 2
131 #define LLCP_SEQUENCE_SIZE 1
132 
133 /* LLCP versions: 1.1 is 1.0 plus SDP */
134 #define LLCP_VERSION_10 0x10
135 #define LLCP_VERSION_11 0x11
136 
137 /* LLCP PDU types */
138 #define LLCP_PDU_SYMM 0x0
139 #define LLCP_PDU_PAX 0x1
140 #define LLCP_PDU_AGF 0x2
141 #define LLCP_PDU_UI 0x3
142 #define LLCP_PDU_CONNECT 0x4
143 #define LLCP_PDU_DISC 0x5
144 #define LLCP_PDU_CC 0x6
145 #define LLCP_PDU_DM 0x7
146 #define LLCP_PDU_FRMR 0x8
147 #define LLCP_PDU_SNL 0x9
148 #define LLCP_PDU_I 0xc
149 #define LLCP_PDU_RR 0xd
150 #define LLCP_PDU_RNR 0xe
151 
152 /* Parameters TLV types */
153 #define LLCP_TLV_VERSION 0x1
154 #define LLCP_TLV_MIUX 0x2
155 #define LLCP_TLV_WKS 0x3
156 #define LLCP_TLV_LTO 0x4
157 #define LLCP_TLV_RW 0x5
158 #define LLCP_TLV_SN 0x6
159 #define LLCP_TLV_OPT 0x7
160 #define LLCP_TLV_SDREQ 0x8
161 #define LLCP_TLV_SDRES 0x9
162 #define LLCP_TLV_MAX 0xa
163 
164 /* Well known LLCP SAP */
165 #define LLCP_SAP_SDP 0x1
166 #define LLCP_SAP_IP 0x2
167 #define LLCP_SAP_OBEX 0x3
168 #define LLCP_SAP_SNEP 0x4
169 #define LLCP_SAP_MAX 0xff
170 
171 /* Disconnection reason code */
172 #define LLCP_DM_DISC 0x00
173 #define LLCP_DM_NOCONN 0x01
174 #define LLCP_DM_NOBOUND 0x02
175 #define LLCP_DM_REJ 0x03
176 
177 
178 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
179 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
180 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
181 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
182 int nfc_llcp_local_put(struct nfc_llcp_local *local);
183 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
184  struct nfc_llcp_sock *sock);
185 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
186 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
187 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
188 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
189  struct sk_buff *skb, u8 direction);
190 
191 /* Sock API */
192 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);
193 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
194 void nfc_llcp_accept_unlink(struct sock *sk);
195 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
196 struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
197 
198 /* TLV API */
199 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
200  u8 *tlv_array, u16 tlv_array_len);
201 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
202  u8 *tlv_array, u16 tlv_array_len);
203 
204 /* Commands API */
205 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
206 u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
207 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
208 int nfc_llcp_disconnect(struct nfc_llcp_sock *sock);
209 int nfc_llcp_send_symm(struct nfc_dev *dev);
210 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
211 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
212 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
213 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
214 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
215  struct msghdr *msg, size_t len);
216 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
217 
218 /* Socket API */
219 int __init nfc_llcp_sock_init(void);
220 void nfc_llcp_sock_exit(void);
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