net/nfc/llcp.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (C) 2011  Intel Corporation. All rights reserved.
   4  */
   5
   6 enum llcp_state {
   7         LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
   8         LLCP_CONNECTING,
   9         LLCP_DISCONNECTING,
  10         LLCP_CLOSED,
  11         LLCP_BOUND,
  12         LLCP_LISTEN,
  13 };
  14
  15 #define LLCP_DEFAULT_LTO 100
  16 #define LLCP_DEFAULT_RW  1
  17 #define LLCP_DEFAULT_MIU 128
  18
  19 #define LLCP_MAX_LTO  0xff
  20 #define LLCP_MAX_RW   15
  21 #define LLCP_MAX_MIUX 0x7ff
  22 #define LLCP_MAX_MIU (LLCP_MAX_MIUX + 128)
  23
  24 #define LLCP_WKS_NUM_SAP   16
  25 #define LLCP_SDP_NUM_SAP   16
  26 #define LLCP_LOCAL_NUM_SAP 32
  27 #define LLCP_LOCAL_SAP_OFFSET (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP)
  28 #define LLCP_MAX_SAP (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP + LLCP_LOCAL_NUM_SAP)
  29 #define LLCP_SDP_UNBOUND   (LLCP_MAX_SAP + 1)
  30
  31 struct nfc_llcp_sock;
  32
  33 struct llcp_sock_list {
  34         struct hlist_head head;
  35         rwlock_t          lock;
  36 };
  37
  38 struct nfc_llcp_sdp_tlv {
  39         u8 *tlv;
  40         u8 tlv_len;
  41
  42         char *uri;
  43         u8 tid;
  44         u8 sap;
  45
  46         unsigned long time;
  47
  48         struct hlist_node node;
  49 };
  50
  51 struct nfc_llcp_local {
  52         struct list_head list;
  53         struct nfc_dev *dev;
  54
  55         struct kref ref;
  56
  57         struct mutex sdp_lock;
  58
  59         struct timer_list link_timer;
  60         struct sk_buff_head tx_queue;
  61         struct work_struct       tx_work;
  62         struct work_struct       rx_work;
  63         struct sk_buff *rx_pending;
  64         struct work_struct       timeout_work;
  65
  66         u32 target_idx;
  67         u8 rf_mode;
  68         u8 comm_mode;
  69         u8 lto;
  70         u8 rw;
  71         __be16 miux;
  72         unsigned long local_wks;      /* Well known services */
  73         unsigned long local_sdp;      /* Local services  */
  74         unsigned long local_sap; /* Local SAPs, not available for discovery */
  75         atomic_t local_sdp_cnt[LLCP_SDP_NUM_SAP];
  76
  77         /* local */
  78         u8 gb[NFC_MAX_GT_LEN];
  79         u8 gb_len;
  80
  81         /* remote */
  82         u8 remote_gb[NFC_MAX_GT_LEN];
  83         u8 remote_gb_len;
  84
  85         u8  remote_version;
  86         u16 remote_miu;
  87         u16 remote_lto;
  88         u8  remote_opt;
  89         u16 remote_wks;
  90
  91         struct mutex sdreq_lock;
  92         struct hlist_head pending_sdreqs;
  93         struct timer_list sdreq_timer;
  94         struct work_struct sdreq_timeout_work;
  95         u8 sdreq_next_tid;
  96
  97         /* sockets array */
  98         struct llcp_sock_list sockets;
  99         struct llcp_sock_list connecting_sockets;
 100         struct llcp_sock_list raw_sockets;
 101 };
 102
 103 struct nfc_llcp_sock {
 104         struct sock sk;
 105         struct nfc_dev *dev;
 106         struct nfc_llcp_local *local;
 107         u32 target_idx;
 108         u32 nfc_protocol;
 109
 110         /* Link parameters */
 111         u8 ssap;
 112         u8 dsap;
 113         char *service_name;
 114         size_t service_name_len;
 115         u8 rw;
 116         __be16 miux;
 117
 118
 119         /* Remote link parameters */
 120         u8 remote_rw;
 121         u16 remote_miu;
 122
 123         /* Link variables */
 124         u8 send_n;
 125         u8 send_ack_n;
 126         u8 recv_n;
 127         u8 recv_ack_n;
 128
 129         /* Is the remote peer ready to receive */
 130         u8 remote_ready;
 131
 132         /* Reserved source SAP */
 133         u8 reserved_ssap;
 134
 135         struct sk_buff_head tx_queue;
 136         struct sk_buff_head tx_pending_queue;
 137
 138         struct list_head accept_queue;
 139         struct sock *parent;
 140 };
 141
 142 struct nfc_llcp_ui_cb {
 143         __u8 dsap;
 144         __u8 ssap;
 145 };
 146
 147 #define nfc_llcp_ui_skb_cb(__skb) ((struct nfc_llcp_ui_cb *)&((__skb)->cb[0]))
 148
 149 #define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
 150 #define nfc_llcp_dev(sk)  (nfc_llcp_sock((sk))->dev)
 151
 152 #define LLCP_HEADER_SIZE   2
 153 #define LLCP_SEQUENCE_SIZE 1
 154 #define LLCP_AGF_PDU_HEADER_SIZE 2
 155
 156 /* LLCP versions: 1.1 is 1.0 plus SDP */
 157 #define LLCP_VERSION_10 0x10
 158 #define LLCP_VERSION_11 0x11
 159
 160 /* LLCP PDU types */
 161 #define LLCP_PDU_SYMM     0x0
 162 #define LLCP_PDU_PAX      0x1
 163 #define LLCP_PDU_AGF      0x2
 164 #define LLCP_PDU_UI       0x3
 165 #define LLCP_PDU_CONNECT  0x4
 166 #define LLCP_PDU_DISC     0x5
 167 #define LLCP_PDU_CC       0x6
 168 #define LLCP_PDU_DM       0x7
 169 #define LLCP_PDU_FRMR     0x8
 170 #define LLCP_PDU_SNL      0x9
 171 #define LLCP_PDU_I        0xc
 172 #define LLCP_PDU_RR       0xd
 173 #define LLCP_PDU_RNR      0xe
 174
 175 /* Parameters TLV types */
 176 #define LLCP_TLV_VERSION 0x1
 177 #define LLCP_TLV_MIUX    0x2
 178 #define LLCP_TLV_WKS     0x3
 179 #define LLCP_TLV_LTO     0x4
 180 #define LLCP_TLV_RW      0x5
 181 #define LLCP_TLV_SN      0x6
 182 #define LLCP_TLV_OPT     0x7
 183 #define LLCP_TLV_SDREQ   0x8
 184 #define LLCP_TLV_SDRES   0x9
 185 #define LLCP_TLV_MAX     0xa
 186
 187 /* Well known LLCP SAP */
 188 #define LLCP_SAP_SDP   0x1
 189 #define LLCP_SAP_IP    0x2
 190 #define LLCP_SAP_OBEX  0x3
 191 #define LLCP_SAP_SNEP  0x4
 192 #define LLCP_SAP_MAX   0xff
 193
 194 /* Disconnection reason code */
 195 #define LLCP_DM_DISC    0x00
 196 #define LLCP_DM_NOCONN  0x01
 197 #define LLCP_DM_NOBOUND 0x02
 198 #define LLCP_DM_REJ     0x03
 199
 200
 201 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
 202 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
 203 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock);
 204 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
 205 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
 206 int nfc_llcp_local_put(struct nfc_llcp_local *local);
 207 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 208                          struct nfc_llcp_sock *sock);
 209 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
 210 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
 211 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
 212 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 213                                struct sk_buff *skb, u8 direction);
 214
 215 /* Sock API */
 216 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern);
 217 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
 218 void nfc_llcp_accept_unlink(struct sock *sk);
 219 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
 220 struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
 221
 222 /* TLV API */
 223 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
 224                           u8 *tlv_array, u16 tlv_array_len);
 225 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
 226                                   u8 *tlv_array, u16 tlv_array_len);
 227
 228 /* Commands API */
 229 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
 230 u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
 231 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap);
 232 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
 233                                                   size_t uri_len);
 234 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp);
 235 void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head);
 236 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
 237 int nfc_llcp_send_symm(struct nfc_dev *dev);
 238 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
 239 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
 240 int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
 241                             struct hlist_head *tlv_list, size_t tlvs_len);
 242 int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
 243                             struct hlist_head *tlv_list, size_t tlvs_len);
 244 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
 245 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
 246 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
 247                           struct msghdr *msg, size_t len);
 248 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
 249                            struct msghdr *msg, size_t len);
 250 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
 251
 252 /* Socket API */
 253 int __init nfc_llcp_sock_init(void);
 254 void nfc_llcp_sock_exit(void);