1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * Copyright (C) 2011 Intel Corporation. All rights reserved. 4 */ 5 6enum 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 31struct nfc_llcp_sock; 32 33struct llcp_sock_list { 34 struct hlist_head head; 35 rwlock_t lock; 36}; 37 38struct 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 51struct 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 103struct 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 142struct 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 201void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s); 202void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s); 203void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock); 204struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev); 205int nfc_llcp_local_put(struct nfc_llcp_local *local); 206u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, 207 struct nfc_llcp_sock *sock); 208u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local); 209void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap); 210int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock); 211void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, 212 struct sk_buff *skb, u8 direction); 213 214/* Sock API */ 215struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern); 216void nfc_llcp_sock_free(struct nfc_llcp_sock *sock); 217void nfc_llcp_accept_unlink(struct sock *sk); 218void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk); 219struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock); 220 221/* TLV API */ 222int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local, 223 const u8 *tlv_array, u16 tlv_array_len); 224int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, 225 const u8 *tlv_array, u16 tlv_array_len); 226 227/* Commands API */ 228void nfc_llcp_recv(void *data, struct sk_buff *skb, int err); 229u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length); 230struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap); 231struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri, 232 size_t uri_len); 233void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp); 234void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head); 235void nfc_llcp_recv(void *data, struct sk_buff *skb, int err); 236int nfc_llcp_send_symm(struct nfc_dev *dev); 237int nfc_llcp_send_connect(struct nfc_llcp_sock *sock); 238int nfc_llcp_send_cc(struct nfc_llcp_sock *sock); 239int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local, 240 struct hlist_head *tlv_list, size_t tlvs_len); 241int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local, 242 struct hlist_head *tlv_list, size_t tlvs_len); 243int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason); 244int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock); 245int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, 246 struct msghdr *msg, size_t len); 247int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap, 248 struct msghdr *msg, size_t len); 249int nfc_llcp_send_rr(struct nfc_llcp_sock *sock); 250 251/* Socket API */ 252int __init nfc_llcp_sock_init(void); 253void nfc_llcp_sock_exit(void); 254