net/nfc/llcp/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_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         u8 lto;
  68         u8 rw;
  69         __be16 miux;
  70         unsigned long local_wks;      /* Well known services */
  71         unsigned long local_sdp;      /* Local services  */
  72         unsigned long local_sap; /* Local SAPs, not available for discovery */
  73         atomic_t local_sdp_cnt[LLCP_SDP_NUM_SAP];
  74
  75         /* local */
  76         u8 gb[NFC_MAX_GT_LEN];
  77         u8 gb_len;
  78
  79         /* remote */
  80         u8 remote_gb[NFC_MAX_GT_LEN];
  81         u8 remote_gb_len;
  82
  83         u8  remote_version;
  84         u16 remote_miu;
  85         u16 remote_lto;
  86         u8  remote_opt;
  87         u16 remote_wks;
  88
  89         /* sockets array */
  90         struct llcp_sock_list sockets;
  91         struct llcp_sock_list connecting_sockets;
  92         struct llcp_sock_list raw_sockets;
  93 };
  94
  95 struct nfc_llcp_sock {
  96         struct sock sk;
  97         struct nfc_dev *dev;
  98         struct nfc_llcp_local *local;
  99         u32 target_idx;
 100         u32 nfc_protocol;
 101
 102         /* Link parameters */
 103         u8 ssap;
 104         u8 dsap;
 105         char *service_name;
 106         size_t service_name_len;
 107
 108         /* Remote link parameters */
 109         u8 remote_rw;
 110         u16 remote_miu;
 111
 112         /* Link variables */
 113         u8 send_n;
 114         u8 send_ack_n;
 115         u8 recv_n;
 116         u8 recv_ack_n;
 117
 118         /* Is the remote peer ready to receive */
 119         u8 remote_ready;
 120
 121         /* Reserved source SAP */
 122         u8 reserved_ssap;
 123
 124         struct sk_buff_head tx_queue;
 125         struct sk_buff_head tx_pending_queue;
 126
 127         struct list_head accept_queue;
 128         struct sock *parent;
 129 };
 130
 131 struct nfc_llcp_ui_cb {
 132         __u8 dsap;
 133         __u8 ssap;
 134 };
 135
 136 #define nfc_llcp_ui_skb_cb(__skb) ((struct nfc_llcp_ui_cb *)&((__skb)->cb[0]))
 137
 138 #define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
 139 #define nfc_llcp_dev(sk)  (nfc_llcp_sock((sk))->dev)
 140
 141 #define LLCP_HEADER_SIZE   2
 142 #define LLCP_SEQUENCE_SIZE 1
 143
 144 /* LLCP versions: 1.1 is 1.0 plus SDP */
 145 #define LLCP_VERSION_10 0x10
 146 #define LLCP_VERSION_11 0x11
 147
 148 /* LLCP PDU types */
 149 #define LLCP_PDU_SYMM     0x0
 150 #define LLCP_PDU_PAX      0x1
 151 #define LLCP_PDU_AGF      0x2
 152 #define LLCP_PDU_UI       0x3
 153 #define LLCP_PDU_CONNECT  0x4
 154 #define LLCP_PDU_DISC     0x5
 155 #define LLCP_PDU_CC       0x6
 156 #define LLCP_PDU_DM       0x7
 157 #define LLCP_PDU_FRMR     0x8
 158 #define LLCP_PDU_SNL      0x9
 159 #define LLCP_PDU_I        0xc
 160 #define LLCP_PDU_RR       0xd
 161 #define LLCP_PDU_RNR      0xe
 162
 163 /* Parameters TLV types */
 164 #define LLCP_TLV_VERSION 0x1
 165 #define LLCP_TLV_MIUX    0x2
 166 #define LLCP_TLV_WKS     0x3
 167 #define LLCP_TLV_LTO     0x4
 168 #define LLCP_TLV_RW      0x5
 169 #define LLCP_TLV_SN      0x6
 170 #define LLCP_TLV_OPT     0x7
 171 #define LLCP_TLV_SDREQ   0x8
 172 #define LLCP_TLV_SDRES   0x9
 173 #define LLCP_TLV_MAX     0xa
 174
 175 /* Well known LLCP SAP */
 176 #define LLCP_SAP_SDP   0x1
 177 #define LLCP_SAP_IP    0x2
 178 #define LLCP_SAP_OBEX  0x3
 179 #define LLCP_SAP_SNEP  0x4
 180 #define LLCP_SAP_MAX   0xff
 181
 182 /* Disconnection reason code */
 183 #define LLCP_DM_DISC    0x00
 184 #define LLCP_DM_NOCONN  0x01
 185 #define LLCP_DM_NOBOUND 0x02
 186 #define LLCP_DM_REJ     0x03
 187
 188
 189 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
 190 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
 191 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
 192 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
 193 int nfc_llcp_local_put(struct nfc_llcp_local *local);
 194 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 195                          struct nfc_llcp_sock *sock);
 196 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
 197 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
 198 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
 199 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 200                                struct sk_buff *skb, u8 direction);
 201
 202 /* Sock API */
 203 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);
 204 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
 205 void nfc_llcp_accept_unlink(struct sock *sk);
 206 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
 207 struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
 208
 209 /* TLV API */
 210 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
 211                           u8 *tlv_array, u16 tlv_array_len);
 212 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
 213                                   u8 *tlv_array, u16 tlv_array_len);
 214
 215 /* Commands API */
 216 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
 217 u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
 218 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
 219 int nfc_llcp_disconnect(struct nfc_llcp_sock *sock);
 220 int nfc_llcp_send_symm(struct nfc_dev *dev);
 221 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
 222 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
 223 int nfc_llcp_send_snl(struct nfc_llcp_local *local, u8 tid, u8 sap);
 224 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
 225 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
 226 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
 227                           struct msghdr *msg, size_t len);
 228 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
 229                            struct msghdr *msg, size_t len);
 230 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
 231
 232 /* Socket API */
 233 int __init nfc_llcp_sock_init(void);
 234 void nfc_llcp_sock_exit(void);