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