net/nfc/llcp.h

   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_CONNECTING,
  23         LLCP_DISCONNECTING,
  24         LLCP_CLOSED,
  25         LLCP_BOUND,
  26         LLCP_LISTEN,
  27 };
  28
  29 #define LLCP_DEFAULT_LTO 100
  30 #define LLCP_DEFAULT_RW  1
  31 #define LLCP_DEFAULT_MIU 128
  32
  33 #define LLCP_MAX_LTO  0xff
  34 #define LLCP_MAX_RW   15
  35 #define LLCP_MAX_MIUX 0x7ff
  36 #define LLCP_MAX_MIU (LLCP_MAX_MIUX + 128)
  37
  38 #define LLCP_WKS_NUM_SAP   16
  39 #define LLCP_SDP_NUM_SAP   16
  40 #define LLCP_LOCAL_NUM_SAP 32
  41 #define LLCP_LOCAL_SAP_OFFSET (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP)
  42 #define LLCP_MAX_SAP (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP + LLCP_LOCAL_NUM_SAP)
  43 #define LLCP_SDP_UNBOUND   (LLCP_MAX_SAP + 1)
  44
  45 struct nfc_llcp_sock;
  46
  47 struct llcp_sock_list {
  48         struct hlist_head head;
  49         rwlock_t          lock;
  50 };
  51
  52 struct nfc_llcp_sdp_tlv {
  53         u8 *tlv;
  54         u8 tlv_len;
  55
  56         char *uri;
  57         u8 tid;
  58         u8 sap;
  59
  60         unsigned long time;
  61
  62         struct hlist_node node;
  63 };
  64
  65 struct nfc_llcp_local {
  66         struct list_head list;
  67         struct nfc_dev *dev;
  68
  69         struct kref ref;
  70
  71         struct mutex sdp_lock;
  72
  73         struct timer_list link_timer;
  74         struct sk_buff_head tx_queue;
  75         struct work_struct       tx_work;
  76         struct work_struct       rx_work;
  77         struct sk_buff *rx_pending;
  78         struct work_struct       timeout_work;
  79
  80         u32 target_idx;
  81         u8 rf_mode;
  82         u8 comm_mode;
  83         u8 lto;
  84         u8 rw;
  85         __be16 miux;
  86         unsigned long local_wks;      /* Well known services */
  87         unsigned long local_sdp;      /* Local services  */
  88         unsigned long local_sap; /* Local SAPs, not available for discovery */
  89         atomic_t local_sdp_cnt[LLCP_SDP_NUM_SAP];
  90
  91         /* local */
  92         u8 gb[NFC_MAX_GT_LEN];
  93         u8 gb_len;
  94
  95         /* remote */
  96         u8 remote_gb[NFC_MAX_GT_LEN];
  97         u8 remote_gb_len;
  98
  99         u8  remote_version;
 100         u16 remote_miu;
 101         u16 remote_lto;
 102         u8  remote_opt;
 103         u16 remote_wks;
 104
 105         struct mutex sdreq_lock;
 106         struct hlist_head pending_sdreqs;
 107         struct timer_list sdreq_timer;
 108         struct work_struct sdreq_timeout_work;
 109         u8 sdreq_next_tid;
 110
 111         /* sockets array */
 112         struct llcp_sock_list sockets;
 113         struct llcp_sock_list connecting_sockets;
 114         struct llcp_sock_list raw_sockets;
 115 };
 116
 117 struct nfc_llcp_sock {
 118         struct sock sk;
 119         struct nfc_dev *dev;
 120         struct nfc_llcp_local *local;
 121         u32 target_idx;
 122         u32 nfc_protocol;
 123
 124         /* Link parameters */
 125         u8 ssap;
 126         u8 dsap;
 127         char *service_name;
 128         size_t service_name_len;
 129         u8 rw;
 130         __be16 miux;
 131
 132
 133         /* Remote link parameters */
 134         u8 remote_rw;
 135         u16 remote_miu;
 136
 137         /* Link variables */
 138         u8 send_n;
 139         u8 send_ack_n;
 140         u8 recv_n;
 141         u8 recv_ack_n;
 142
 143         /* Is the remote peer ready to receive */
 144         u8 remote_ready;
 145
 146         /* Reserved source SAP */
 147         u8 reserved_ssap;
 148
 149         struct sk_buff_head tx_queue;
 150         struct sk_buff_head tx_pending_queue;
 151
 152         struct list_head accept_queue;
 153         struct sock *parent;
 154 };
 155
 156 struct nfc_llcp_ui_cb {
 157         __u8 dsap;
 158         __u8 ssap;
 159 };
 160
 161 #define nfc_llcp_ui_skb_cb(__skb) ((struct nfc_llcp_ui_cb *)&((__skb)->cb[0]))
 162
 163 #define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
 164 #define nfc_llcp_dev(sk)  (nfc_llcp_sock((sk))->dev)
 165
 166 #define LLCP_HEADER_SIZE   2
 167 #define LLCP_SEQUENCE_SIZE 1
 168 #define LLCP_AGF_PDU_HEADER_SIZE 2
 169
 170 /* LLCP versions: 1.1 is 1.0 plus SDP */
 171 #define LLCP_VERSION_10 0x10
 172 #define LLCP_VERSION_11 0x11
 173
 174 /* LLCP PDU types */
 175 #define LLCP_PDU_SYMM     0x0
 176 #define LLCP_PDU_PAX      0x1
 177 #define LLCP_PDU_AGF      0x2
 178 #define LLCP_PDU_UI       0x3
 179 #define LLCP_PDU_CONNECT  0x4
 180 #define LLCP_PDU_DISC     0x5
 181 #define LLCP_PDU_CC       0x6
 182 #define LLCP_PDU_DM       0x7
 183 #define LLCP_PDU_FRMR     0x8
 184 #define LLCP_PDU_SNL      0x9
 185 #define LLCP_PDU_I        0xc
 186 #define LLCP_PDU_RR       0xd
 187 #define LLCP_PDU_RNR      0xe
 188
 189 /* Parameters TLV types */
 190 #define LLCP_TLV_VERSION 0x1
 191 #define LLCP_TLV_MIUX    0x2
 192 #define LLCP_TLV_WKS     0x3
 193 #define LLCP_TLV_LTO     0x4
 194 #define LLCP_TLV_RW      0x5
 195 #define LLCP_TLV_SN      0x6
 196 #define LLCP_TLV_OPT     0x7
 197 #define LLCP_TLV_SDREQ   0x8
 198 #define LLCP_TLV_SDRES   0x9
 199 #define LLCP_TLV_MAX     0xa
 200
 201 /* Well known LLCP SAP */
 202 #define LLCP_SAP_SDP   0x1
 203 #define LLCP_SAP_IP    0x2
 204 #define LLCP_SAP_OBEX  0x3
 205 #define LLCP_SAP_SNEP  0x4
 206 #define LLCP_SAP_MAX   0xff
 207
 208 /* Disconnection reason code */
 209 #define LLCP_DM_DISC    0x00
 210 #define LLCP_DM_NOCONN  0x01
 211 #define LLCP_DM_NOBOUND 0x02
 212 #define LLCP_DM_REJ     0x03
 213
 214
 215 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
 216 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
 217 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock);
 218 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
 219 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
 220 int nfc_llcp_local_put(struct nfc_llcp_local *local);
 221 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 222                          struct nfc_llcp_sock *sock);
 223 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
 224 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
 225 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
 226 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 227                                struct sk_buff *skb, u8 direction);
 228
 229 /* Sock API */
 230 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);
 231 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
 232 void nfc_llcp_accept_unlink(struct sock *sk);
 233 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
 234 struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
 235
 236 /* TLV API */
 237 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
 238                           u8 *tlv_array, u16 tlv_array_len);
 239 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
 240                                   u8 *tlv_array, u16 tlv_array_len);
 241
 242 /* Commands API */
 243 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
 244 u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
 245 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap);
 246 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
 247                                                   size_t uri_len);
 248 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp);
 249 void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head);
 250 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
 251 int nfc_llcp_send_symm(struct nfc_dev *dev);
 252 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
 253 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
 254 int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
 255                             struct hlist_head *tlv_list, size_t tlvs_len);
 256 int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
 257                             struct hlist_head *tlv_list, size_t tlvs_len);
 258 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
 259 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
 260 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
 261                           struct msghdr *msg, size_t len);
 262 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
 263                            struct msghdr *msg, size_t len);
 264 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
 265
 266 /* Socket API */
 267 int __init nfc_llcp_sock_init(void);
 268 void nfc_llcp_sock_exit(void);