net/nfc/llcp.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * Copyright (C) 2011  Intel Corporation. All rights reserved.
0004  */
0005
0006 enum llcp_state {
0007     LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
0008     LLCP_CONNECTING,
0009     LLCP_CLOSED,
0010     LLCP_BOUND,
0011     LLCP_LISTEN,
0012 };
0013
0014 #define LLCP_DEFAULT_LTO 100
0015 #define LLCP_DEFAULT_RW  1
0016 #define LLCP_DEFAULT_MIU 128
0017
0018 #define LLCP_MAX_LTO  0xff
0019 #define LLCP_MAX_RW   15
0020 #define LLCP_MAX_MIUX 0x7ff
0021 #define LLCP_MAX_MIU (LLCP_MAX_MIUX + 128)
0022
0023 #define LLCP_WKS_NUM_SAP   16
0024 #define LLCP_SDP_NUM_SAP   16
0025 #define LLCP_LOCAL_NUM_SAP 32
0026 #define LLCP_LOCAL_SAP_OFFSET (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP)
0027 #define LLCP_MAX_SAP (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP + LLCP_LOCAL_NUM_SAP)
0028 #define LLCP_SDP_UNBOUND   (LLCP_MAX_SAP + 1)
0029
0030 struct nfc_llcp_sock;
0031
0032 struct llcp_sock_list {
0033     struct hlist_head head;
0034     rwlock_t          lock;
0035 };
0036
0037 struct nfc_llcp_sdp_tlv {
0038     u8 *tlv;
0039     u8 tlv_len;
0040
0041     char *uri;
0042     u8 tid;
0043     u8 sap;
0044
0045     unsigned long time;
0046
0047     struct hlist_node node;
0048 };
0049
0050 struct nfc_llcp_local {
0051     struct list_head list;
0052     struct nfc_dev *dev;
0053
0054     struct kref ref;
0055
0056     struct mutex sdp_lock;
0057
0058     struct timer_list link_timer;
0059     struct sk_buff_head tx_queue;
0060     struct work_struct   tx_work;
0061     struct work_struct   rx_work;
0062     struct sk_buff *rx_pending;
0063     struct work_struct   timeout_work;
0064
0065     u32 target_idx;
0066     u8 rf_mode;
0067     u8 comm_mode;
0068     u8 lto;
0069     u8 rw;
0070     __be16 miux;
0071     unsigned long local_wks;      /* Well known services */
0072     unsigned long local_sdp;      /* Local services  */
0073     unsigned long local_sap; /* Local SAPs, not available for discovery */
0074     atomic_t local_sdp_cnt[LLCP_SDP_NUM_SAP];
0075
0076     /* local */
0077     u8 gb[NFC_MAX_GT_LEN];
0078     u8 gb_len;
0079
0080     /* remote */
0081     u8 remote_gb[NFC_MAX_GT_LEN];
0082     u8 remote_gb_len;
0083
0084     u8  remote_version;
0085     u16 remote_miu;
0086     u16 remote_lto;
0087     u8  remote_opt;
0088     u16 remote_wks;
0089
0090     struct mutex sdreq_lock;
0091     struct hlist_head pending_sdreqs;
0092     struct timer_list sdreq_timer;
0093     struct work_struct sdreq_timeout_work;
0094     u8 sdreq_next_tid;
0095
0096     /* sockets array */
0097     struct llcp_sock_list sockets;
0098     struct llcp_sock_list connecting_sockets;
0099     struct llcp_sock_list raw_sockets;
0100 };
0101
0102 struct nfc_llcp_sock {
0103     struct sock sk;
0104     struct nfc_dev *dev;
0105     struct nfc_llcp_local *local;
0106     u32 target_idx;
0107     u32 nfc_protocol;
0108
0109     /* Link parameters */
0110     u8 ssap;
0111     u8 dsap;
0112     char *service_name;
0113     size_t service_name_len;
0114     u8 rw;
0115     __be16 miux;
0116
0117
0118     /* Remote link parameters */
0119     u8 remote_rw;
0120     u16 remote_miu;
0121
0122     /* Link variables */
0123     u8 send_n;
0124     u8 send_ack_n;
0125     u8 recv_n;
0126     u8 recv_ack_n;
0127
0128     /* Is the remote peer ready to receive */
0129     u8 remote_ready;
0130
0131     /* Reserved source SAP */
0132     u8 reserved_ssap;
0133
0134     struct sk_buff_head tx_queue;
0135     struct sk_buff_head tx_pending_queue;
0136
0137     struct list_head accept_queue;
0138     struct sock *parent;
0139 };
0140
0141 struct nfc_llcp_ui_cb {
0142     __u8 dsap;
0143     __u8 ssap;
0144 };
0145
0146 #define nfc_llcp_ui_skb_cb(__skb) ((struct nfc_llcp_ui_cb *)&((__skb)->cb[0]))
0147
0148 #define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
0149 #define nfc_llcp_dev(sk)  (nfc_llcp_sock((sk))->dev)
0150
0151 #define LLCP_HEADER_SIZE   2
0152 #define LLCP_SEQUENCE_SIZE 1
0153 #define LLCP_AGF_PDU_HEADER_SIZE 2
0154
0155 /* LLCP versions: 1.1 is 1.0 plus SDP */
0156 #define LLCP_VERSION_10 0x10
0157 #define LLCP_VERSION_11 0x11
0158
0159 /* LLCP PDU types */
0160 #define LLCP_PDU_SYMM     0x0
0161 #define LLCP_PDU_PAX      0x1
0162 #define LLCP_PDU_AGF      0x2
0163 #define LLCP_PDU_UI       0x3
0164 #define LLCP_PDU_CONNECT  0x4
0165 #define LLCP_PDU_DISC     0x5
0166 #define LLCP_PDU_CC       0x6
0167 #define LLCP_PDU_DM       0x7
0168 #define LLCP_PDU_FRMR     0x8
0169 #define LLCP_PDU_SNL      0x9
0170 #define LLCP_PDU_I        0xc
0171 #define LLCP_PDU_RR       0xd
0172 #define LLCP_PDU_RNR      0xe
0173
0174 /* Parameters TLV types */
0175 #define LLCP_TLV_VERSION 0x1
0176 #define LLCP_TLV_MIUX    0x2
0177 #define LLCP_TLV_WKS     0x3
0178 #define LLCP_TLV_LTO     0x4
0179 #define LLCP_TLV_RW      0x5
0180 #define LLCP_TLV_SN      0x6
0181 #define LLCP_TLV_OPT     0x7
0182 #define LLCP_TLV_SDREQ   0x8
0183 #define LLCP_TLV_SDRES   0x9
0184 #define LLCP_TLV_MAX     0xa
0185
0186 /* Well known LLCP SAP */
0187 #define LLCP_SAP_SDP   0x1
0188 #define LLCP_SAP_IP    0x2
0189 #define LLCP_SAP_OBEX  0x3
0190 #define LLCP_SAP_SNEP  0x4
0191 #define LLCP_SAP_MAX   0xff
0192
0193 /* Disconnection reason code */
0194 #define LLCP_DM_DISC    0x00
0195 #define LLCP_DM_NOCONN  0x01
0196 #define LLCP_DM_NOBOUND 0x02
0197 #define LLCP_DM_REJ     0x03
0198
0199
0200 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
0201 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
0202 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock);
0203 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
0204 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
0205 int nfc_llcp_local_put(struct nfc_llcp_local *local);
0206 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
0207              struct nfc_llcp_sock *sock);
0208 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
0209 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
0210 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
0211 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
0212                    struct sk_buff *skb, u8 direction);
0213
0214 /* Sock API */
0215 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern);
0216 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
0217 void nfc_llcp_accept_unlink(struct sock *sk);
0218 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
0219 struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
0220
0221 /* TLV API */
0222 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
0223               const u8 *tlv_array, u16 tlv_array_len);
0224 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
0225                   const u8 *tlv_array, u16 tlv_array_len);
0226
0227 /* Commands API */
0228 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
0229 u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length);
0230 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap);
0231 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri,
0232                           size_t uri_len);
0233 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp);
0234 void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head);
0235 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
0236 int nfc_llcp_send_symm(struct nfc_dev *dev);
0237 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
0238 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
0239 int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
0240                 struct hlist_head *tlv_list, size_t tlvs_len);
0241 int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
0242                 struct hlist_head *tlv_list, size_t tlvs_len);
0243 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
0244 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
0245 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
0246               struct msghdr *msg, size_t len);
0247 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
0248                struct msghdr *msg, size_t len);
0249 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
0250
0251 /* Socket API */
0252 int __init nfc_llcp_sock_init(void);
0253 void nfc_llcp_sock_exit(void);