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 const u8 *tlv_array, u16 tlv_array_len); 225 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, 226 const 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, const 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, const 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); 255