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, 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);
 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);