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TOMOYO Linux Cross Reference
Linux/net/nfc/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, 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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