LXR linux/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
  20enum 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#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
  43struct nfc_llcp_sock;
  44
  45struct llcp_sock_list {
  46        struct hlist_head head;
  47        rwlock_t          lock;
  48};
  49
  50struct 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
  63struct 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
 115struct 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
 154struct 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
 213void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
 214void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
 215void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock);
 216struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
 217struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
 218int nfc_llcp_local_put(struct nfc_llcp_local *local);
 219u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 220                         struct nfc_llcp_sock *sock);
 221u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
 222void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
 223int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
 224void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 225                               struct sk_buff *skb, u8 direction);
 226
 227/* Sock API */
 228struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);
 229void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
 230void nfc_llcp_accept_unlink(struct sock *sk);
 231void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
 232struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
 233
 234/* TLV API */
 235int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
 236                          u8 *tlv_array, u16 tlv_array_len);
 237int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
 238                                  u8 *tlv_array, u16 tlv_array_len);
 239
 240/* Commands API */
 241void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
 242u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
 243struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap);
 244struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
 245                                                  size_t uri_len);
 246void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp);
 247void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head);
 248void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
 249int nfc_llcp_disconnect(struct nfc_llcp_sock *sock);
 250int nfc_llcp_send_symm(struct nfc_dev *dev);
 251int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
 252int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
 253int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
 254                            struct hlist_head *tlv_list, size_t tlvs_len);
 255int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
 256                            struct hlist_head *tlv_list, size_t tlvs_len);
 257int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
 258int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
 259int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
 260                          struct msghdr *msg, size_t len);
 261int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
 262                           struct msghdr *msg, size_t len);
 263int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
 264
 265/* Socket API */
 266int __init nfc_llcp_sock_init(void);
 267void nfc_llcp_sock_exit(void);
 268