1 /** 2 * @file 3 * netconn API (to be used from non-TCPIP threads) 4 */ 5 6 /* 7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without modification, 11 * are permitted provided that the following conditions are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 30 * OF SUCH DAMAGE. 31 * 32 * This file is part of the lwIP TCP/IP stack. 33 * 34 * Author: Adam Dunkels <adam@sics.se> 35 * 36 */ 37 #ifndef LWIP_HDR_API_H 38 #define LWIP_HDR_API_H 39 40 #include "lwip/opt.h" 41 42 #if LWIP_NETCONN || LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */ 43 /* Note: Netconn API is always available when sockets are enabled - 44 * sockets are implemented on top of them */ 45 46 #include "lwip/arch.h" 47 #include "lwip/netbuf.h" 48 #include "lwip/sys.h" 49 #include "lwip/ip_addr.h" 50 #include "lwip/err.h" 51 52 #ifdef __cplusplus 53 extern "C" { 54 #endif 55 56 /* Throughout this file, IP addresses and port numbers are expected to be in 57 * the same byte order as in the corresponding pcb. 58 */ 59 60 /* Flags for netconn_write (u8_t) */ 61 #define NETCONN_NOFLAG 0x00 62 #define NETCONN_NOCOPY 0x00 /* Only for source code compatibility */ 63 #define NETCONN_COPY 0x01 64 #define NETCONN_MORE 0x02 65 #define NETCONN_DONTBLOCK 0x04 66 #define NETCONN_NOAUTORCVD 0x08 /* prevent netconn_recv_data_tcp() from updating the tcp window - must be done manually via netconn_tcp_recvd() */ 67 #define NETCONN_NOFIN 0x10 /* upper layer already received data, leave FIN in queue until called again */ 68 69 /* Flags for struct netconn.flags (u8_t) */ 70 /** This netconn had an error, don't block on recvmbox/acceptmbox any more */ 71 #define NETCONN_FLAG_MBOXCLOSED 0x01 72 /** Should this netconn avoid blocking? */ 73 #define NETCONN_FLAG_NON_BLOCKING 0x02 74 /** Was the last connect action a non-blocking one? */ 75 #define NETCONN_FLAG_IN_NONBLOCKING_CONNECT 0x04 76 #if LWIP_NETCONN_FULLDUPLEX 77 /** The mbox of this netconn is being deallocated, don't use it anymore */ 78 #define NETCONN_FLAG_MBOXINVALID 0x08 79 #endif /* LWIP_NETCONN_FULLDUPLEX */ 80 /** If a nonblocking write has been rejected before, poll_tcp needs to 81 check if the netconn is writable again */ 82 #define NETCONN_FLAG_CHECK_WRITESPACE 0x10 83 #if LWIP_IPV6 84 /** If this flag is set then only IPv6 communication is allowed on the 85 netconn. As per RFC#3493 this features defaults to OFF allowing 86 dual-stack usage by default. */ 87 #define NETCONN_FLAG_IPV6_V6ONLY 0x20 88 #endif /* LWIP_IPV6 */ 89 #if LWIP_NETBUF_RECVINFO 90 /** Received packet info will be recorded for this netconn */ 91 #define NETCONN_FLAG_PKTINFO 0x40 92 #endif /* LWIP_NETBUF_RECVINFO */ 93 /** A FIN has been received but not passed to the application yet */ 94 #define NETCONN_FIN_RX_PENDING 0x80 95 96 /* Helpers to process several netconn_types by the same code */ 97 #define NETCONNTYPE_GROUP(t) ((t)&0xF0) 98 #define NETCONNTYPE_DATAGRAM(t) ((t)&0xE0) 99 #if LWIP_IPV6 100 #define NETCONN_TYPE_IPV6 0x08 101 #define NETCONNTYPE_ISIPV6(t) (((t)&NETCONN_TYPE_IPV6) != 0) 102 #define NETCONNTYPE_ISUDPLITE(t) (((t)&0xF3) == NETCONN_UDPLITE) 103 #define NETCONNTYPE_ISUDPNOCHKSUM(t) (((t)&0xF3) == NETCONN_UDPNOCHKSUM) 104 #else /* LWIP_IPV6 */ 105 #define NETCONNTYPE_ISIPV6(t) (0) 106 #define NETCONNTYPE_ISUDPLITE(t) ((t) == NETCONN_UDPLITE) 107 #define NETCONNTYPE_ISUDPNOCHKSUM(t) ((t) == NETCONN_UDPNOCHKSUM) 108 #endif /* LWIP_IPV6 */ 109 110 /** @ingroup netconn_common 111 * Protocol family and type of the netconn 112 */ 113 enum netconn_type { 114 NETCONN_INVALID = 0, 115 /** TCP IPv4 */ 116 NETCONN_TCP = 0x10, 117 #if LWIP_IPV6 118 /** TCP IPv6 */ 119 NETCONN_TCP_IPV6 = NETCONN_TCP | NETCONN_TYPE_IPV6 /* 0x18 */, 120 #endif /* LWIP_IPV6 */ 121 /** UDP IPv4 */ 122 NETCONN_UDP = 0x20, 123 /** UDP IPv4 lite */ 124 NETCONN_UDPLITE = 0x21, 125 /** UDP IPv4 no checksum */ 126 NETCONN_UDPNOCHKSUM = 0x22, 127 128 #if LWIP_IPV6 129 /** UDP IPv6 (dual-stack by default, unless you call @ref netconn_set_ipv6only) */ 130 NETCONN_UDP_IPV6 = NETCONN_UDP | NETCONN_TYPE_IPV6 /* 0x28 */, 131 /** UDP IPv6 lite (dual-stack by default, unless you call @ref netconn_set_ipv6only) */ 132 NETCONN_UDPLITE_IPV6 = NETCONN_UDPLITE | NETCONN_TYPE_IPV6 /* 0x29 */, 133 /** UDP IPv6 no checksum (dual-stack by default, unless you call @ref netconn_set_ipv6only) */ 134 NETCONN_UDPNOCHKSUM_IPV6 = NETCONN_UDPNOCHKSUM | NETCONN_TYPE_IPV6 /* 0x2a */, 135 #endif /* LWIP_IPV6 */ 136 137 /** Raw connection IPv4 */ 138 NETCONN_RAW = 0x40 139 #if LWIP_IPV6 140 /** Raw connection IPv6 (dual-stack by default, unless you call @ref netconn_set_ipv6only) */ 141 , NETCONN_RAW_IPV6 = NETCONN_RAW | NETCONN_TYPE_IPV6 /* 0x48 */ 142 #endif /* LWIP_IPV6 */ 143 }; 144 145 /** Current state of the netconn. Non-TCP netconns are always 146 * in state NETCONN_NONE! */ 147 enum netconn_state { 148 NETCONN_NONE, 149 NETCONN_WRITE, 150 NETCONN_LISTEN, 151 NETCONN_CONNECT, 152 NETCONN_CLOSE 153 }; 154 155 /** Used to inform the callback function about changes 156 * 157 * Event explanation: 158 * 159 * In the netconn implementation, there are three ways to block a client: 160 * 161 * - accept mbox (sys_arch_mbox_fetch(&conn->acceptmbox, &accept_ptr, 0); in netconn_accept()) 162 * - receive mbox (sys_arch_mbox_fetch(&conn->recvmbox, &buf, 0); in netconn_recv_data()) 163 * - send queue is full (sys_arch_sem_wait(LWIP_API_MSG_SEM(msg), 0); in lwip_netconn_do_write()) 164 * 165 * The events have to be seen as events signaling the state of these mboxes/semaphores. For non-blocking 166 * connections, you need to know in advance whether a call to a netconn function call would block or not, 167 * and these events tell you about that. 168 * 169 * RCVPLUS events say: Safe to perform a potentially blocking call call once more. 170 * They are counted in sockets - three RCVPLUS events for accept mbox means you are safe 171 * to call netconn_accept 3 times without being blocked. 172 * Same thing for receive mbox. 173 * 174 * RCVMINUS events say: Your call to to a possibly blocking function is "acknowledged". 175 * Socket implementation decrements the counter. 176 * 177 * For TX, there is no need to count, its merely a flag. SENDPLUS means you may send something. 178 * SENDPLUS occurs when enough data was delivered to peer so netconn_send() can be called again. 179 * A SENDMINUS event occurs when the next call to a netconn_send() would be blocking. 180 */ 181 enum netconn_evt { 182 NETCONN_EVT_RCVPLUS, 183 NETCONN_EVT_RCVMINUS, 184 NETCONN_EVT_SENDPLUS, 185 NETCONN_EVT_SENDMINUS, 186 NETCONN_EVT_ERROR 187 }; 188 189 #if LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) 190 /** Used for netconn_join_leave_group() */ 191 enum netconn_igmp { 192 NETCONN_JOIN, 193 NETCONN_LEAVE 194 }; 195 #endif /* LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) */ 196 197 #if LWIP_DNS 198 /* Used for netconn_gethostbyname_addrtype(), these should match the DNS_ADDRTYPE defines in dns.h */ 199 #define NETCONN_DNS_DEFAULT NETCONN_DNS_IPV4_IPV6 200 #define NETCONN_DNS_IPV4 0 201 #define NETCONN_DNS_IPV6 1 202 #define NETCONN_DNS_IPV4_IPV6 2 /* try to resolve IPv4 first, try IPv6 if IPv4 fails only */ 203 #define NETCONN_DNS_IPV6_IPV4 3 /* try to resolve IPv6 first, try IPv4 if IPv6 fails only */ 204 #endif /* LWIP_DNS */ 205 206 /* forward-declare some structs to avoid to include their headers */ 207 struct ip_pcb; 208 struct tcp_pcb; 209 struct udp_pcb; 210 struct raw_pcb; 211 struct netconn; 212 struct api_msg; 213 214 /** A callback prototype to inform about events for a netconn */ 215 typedef void (* netconn_callback)(struct netconn *, enum netconn_evt, u16_t len); 216 217 /** A netconn descriptor */ 218 struct netconn { 219 /** type of the netconn (TCP, UDP or RAW) */ 220 enum netconn_type type; 221 /** current state of the netconn */ 222 enum netconn_state state; 223 /** the lwIP internal protocol control block */ 224 union { 225 struct ip_pcb *ip; 226 struct tcp_pcb *tcp; 227 struct udp_pcb *udp; 228 struct raw_pcb *raw; 229 } pcb; 230 /** the last asynchronous unreported error this netconn had */ 231 err_t pending_err; 232 #if !LWIP_NETCONN_SEM_PER_THREAD 233 /** sem that is used to synchronously execute functions in the core context */ 234 sys_sem_t op_completed; 235 #endif 236 /** mbox where received packets are stored until they are fetched 237 by the netconn application thread (can grow quite big) */ 238 sys_mbox_t recvmbox; 239 #if LWIP_TCP 240 /** mbox where new connections are stored until processed 241 by the application thread */ 242 sys_mbox_t acceptmbox; 243 #endif /* LWIP_TCP */ 244 #if LWIP_NETCONN_FULLDUPLEX 245 /** number of threads waiting on an mbox. This is required to unblock 246 all threads when closing while threads are waiting. */ 247 int mbox_threads_waiting; 248 #endif 249 /** only used for socket layer */ 250 #if LWIP_SOCKET 251 int socket; 252 #endif /* LWIP_SOCKET */ 253 #if LWIP_SO_SNDTIMEO 254 /** timeout to wait for sending data (which means enqueueing data for sending 255 in internal buffers) in milliseconds */ 256 s32_t send_timeout; 257 #endif /* LWIP_SO_RCVTIMEO */ 258 #if LWIP_SO_RCVTIMEO 259 /** timeout in milliseconds to wait for new data to be received 260 (or connections to arrive for listening netconns) */ 261 u32_t recv_timeout; 262 #endif /* LWIP_SO_RCVTIMEO */ 263 #if LWIP_SO_RCVBUF 264 /** maximum amount of bytes queued in recvmbox 265 not used for TCP: adjust TCP_WND instead! */ 266 int recv_bufsize; 267 /** number of bytes currently in recvmbox to be received, 268 tested against recv_bufsize to limit bytes on recvmbox 269 for UDP and RAW, used for FIONREAD */ 270 int recv_avail; 271 #endif /* LWIP_SO_RCVBUF */ 272 #if LWIP_SO_LINGER 273 /** values <0 mean linger is disabled, values > 0 are seconds to linger */ 274 s16_t linger; 275 #endif /* LWIP_SO_LINGER */ 276 /** flags holding more netconn-internal state, see NETCONN_FLAG_* defines */ 277 u8_t flags; 278 #if LWIP_TCP 279 /** TCP: when data passed to netconn_write doesn't fit into the send buffer, 280 this temporarily stores the message. 281 Also used during connect and close. */ 282 struct api_msg *current_msg; 283 #endif /* LWIP_TCP */ 284 /** A callback function that is informed about events for this netconn */ 285 netconn_callback callback; 286 }; 287 288 /** This vector type is passed to @ref netconn_write_vectors_partly to send 289 * multiple buffers at once. 290 * ATTENTION: This type has to directly map struct iovec since one is casted 291 * into the other! 292 */ 293 struct netvector { 294 /** pointer to the application buffer that contains the data to send */ 295 const void *ptr; 296 /** size of the application data to send */ 297 size_t len; 298 }; 299 300 /** Register an Network connection event */ 301 #define API_EVENT(c,e,l) if (c->callback) { \ 302 (*c->callback)(c, e, l); \ 303 } 304 305 /* Network connection functions: */ 306 307 /** @ingroup netconn_common 308 * Create new netconn connection 309 * @param t @ref netconn_type */ 310 #define netconn_new(t) netconn_new_with_proto_and_callback(t, 0, NULL) 311 #define netconn_new_with_callback(t, c) netconn_new_with_proto_and_callback(t, 0, c) 312 struct netconn *netconn_new_with_proto_and_callback(enum netconn_type t, u8_t proto, 313 netconn_callback callback); 314 err_t netconn_prepare_delete(struct netconn *conn); 315 err_t netconn_delete(struct netconn *conn); 316 /** Get the type of a netconn (as enum netconn_type). */ 317 #define netconn_type(conn) (conn->type) 318 319 err_t netconn_getaddr(struct netconn *conn, ip_addr_t *addr, 320 u16_t *port, u8_t local); 321 /** @ingroup netconn_common */ 322 #define netconn_peer(c,i,p) netconn_getaddr(c,i,p,0) 323 /** @ingroup netconn_common */ 324 #define netconn_addr(c,i,p) netconn_getaddr(c,i,p,1) 325 326 err_t netconn_bind(struct netconn *conn, const ip_addr_t *addr, u16_t port); 327 err_t netconn_bind_if(struct netconn *conn, u8_t if_idx); 328 err_t netconn_connect(struct netconn *conn, const ip_addr_t *addr, u16_t port); 329 err_t netconn_disconnect (struct netconn *conn); 330 err_t netconn_listen_with_backlog(struct netconn *conn, u8_t backlog); 331 /** @ingroup netconn_tcp */ 332 #define netconn_listen(conn) netconn_listen_with_backlog(conn, TCP_DEFAULT_LISTEN_BACKLOG) 333 err_t netconn_accept(struct netconn *conn, struct netconn **new_conn); 334 err_t netconn_recv(struct netconn *conn, struct netbuf **new_buf); 335 err_t netconn_recv_udp_raw_netbuf(struct netconn *conn, struct netbuf **new_buf); 336 err_t netconn_recv_udp_raw_netbuf_flags(struct netconn *conn, struct netbuf **new_buf, u8_t apiflags); 337 err_t netconn_recv_tcp_pbuf(struct netconn *conn, struct pbuf **new_buf); 338 err_t netconn_recv_tcp_pbuf_flags(struct netconn *conn, struct pbuf **new_buf, u8_t apiflags); 339 err_t netconn_tcp_recvd(struct netconn *conn, size_t len); 340 err_t netconn_sendto(struct netconn *conn, struct netbuf *buf, 341 const ip_addr_t *addr, u16_t port); 342 err_t netconn_send(struct netconn *conn, struct netbuf *buf); 343 err_t netconn_write_partly(struct netconn *conn, const void *dataptr, size_t size, 344 u8_t apiflags, size_t *bytes_written); 345 err_t netconn_write_vectors_partly(struct netconn *conn, struct netvector *vectors, u16_t vectorcnt, 346 u8_t apiflags, size_t *bytes_written); 347 /** @ingroup netconn_tcp */ 348 #define netconn_write(conn, dataptr, size, apiflags) \ 349 netconn_write_partly(conn, dataptr, size, apiflags, NULL) 350 err_t netconn_close(struct netconn *conn); 351 err_t netconn_shutdown(struct netconn *conn, u8_t shut_rx, u8_t shut_tx); 352 353 #if LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) 354 err_t netconn_join_leave_group(struct netconn *conn, const ip_addr_t *multiaddr, 355 const ip_addr_t *netif_addr, enum netconn_igmp join_or_leave); 356 err_t netconn_join_leave_group_netif(struct netconn *conn, const ip_addr_t *multiaddr, 357 u8_t if_idx, enum netconn_igmp join_or_leave); 358 #endif /* LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) */ 359 #if LWIP_DNS 360 #if LWIP_IPV4 && LWIP_IPV6 361 err_t netconn_gethostbyname_addrtype(const char *name, ip_addr_t *addr, u8_t dns_addrtype); 362 #define netconn_gethostbyname(name, addr) netconn_gethostbyname_addrtype(name, addr, NETCONN_DNS_DEFAULT) 363 #else /* LWIP_IPV4 && LWIP_IPV6 */ 364 err_t netconn_gethostbyname(const char *name, ip_addr_t *addr); 365 #define netconn_gethostbyname_addrtype(name, addr, dns_addrtype) netconn_gethostbyname(name, addr) 366 #endif /* LWIP_IPV4 && LWIP_IPV6 */ 367 #endif /* LWIP_DNS */ 368 369 err_t netconn_err(struct netconn *conn); 370 #define netconn_recv_bufsize(conn) ((conn)->recv_bufsize) 371 372 #define netconn_set_flags(conn, set_flags) do { (conn)->flags = (u8_t)((conn)->flags | (set_flags)); } while(0) 373 #define netconn_clear_flags(conn, clr_flags) do { (conn)->flags = (u8_t)((conn)->flags & (u8_t)(~(clr_flags) & 0xff)); } while(0) 374 #define netconn_is_flag_set(conn, flag) (((conn)->flags & (flag)) != 0) 375 376 /** Set the blocking status of netconn calls (@todo: write/send is missing) */ 377 #define netconn_set_nonblocking(conn, val) do { if(val) { \ 378 netconn_set_flags(conn, NETCONN_FLAG_NON_BLOCKING); \ 379 } else { \ 380 netconn_clear_flags(conn, NETCONN_FLAG_NON_BLOCKING); }} while(0) 381 /** Get the blocking status of netconn calls (@todo: write/send is missing) */ 382 #define netconn_is_nonblocking(conn) (((conn)->flags & NETCONN_FLAG_NON_BLOCKING) != 0) 383 384 #if LWIP_IPV6 385 /** @ingroup netconn_common 386 * TCP: Set the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY) 387 */ 388 #define netconn_set_ipv6only(conn, val) do { if(val) { \ 389 netconn_set_flags(conn, NETCONN_FLAG_IPV6_V6ONLY); \ 390 } else { \ 391 netconn_clear_flags(conn, NETCONN_FLAG_IPV6_V6ONLY); }} while(0) 392 /** @ingroup netconn_common 393 * TCP: Get the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY) 394 */ 395 #define netconn_get_ipv6only(conn) (((conn)->flags & NETCONN_FLAG_IPV6_V6ONLY) != 0) 396 #endif /* LWIP_IPV6 */ 397 398 #if LWIP_SO_SNDTIMEO 399 /** Set the send timeout in milliseconds */ 400 #define netconn_set_sendtimeout(conn, timeout) ((conn)->send_timeout = (timeout)) 401 /** Get the send timeout in milliseconds */ 402 #define netconn_get_sendtimeout(conn) ((conn)->send_timeout) 403 #endif /* LWIP_SO_SNDTIMEO */ 404 #if LWIP_SO_RCVTIMEO 405 /** Set the receive timeout in milliseconds */ 406 #define netconn_set_recvtimeout(conn, timeout) ((conn)->recv_timeout = (timeout)) 407 /** Get the receive timeout in milliseconds */ 408 #define netconn_get_recvtimeout(conn) ((conn)->recv_timeout) 409 #endif /* LWIP_SO_RCVTIMEO */ 410 #if LWIP_SO_RCVBUF 411 /** Set the receive buffer in bytes */ 412 #define netconn_set_recvbufsize(conn, recvbufsize) ((conn)->recv_bufsize = (recvbufsize)) 413 /** Get the receive buffer in bytes */ 414 #define netconn_get_recvbufsize(conn) ((conn)->recv_bufsize) 415 #endif /* LWIP_SO_RCVBUF*/ 416 417 #if LWIP_NETCONN_SEM_PER_THREAD 418 void netconn_thread_init(void); 419 void netconn_thread_cleanup(void); 420 #else /* LWIP_NETCONN_SEM_PER_THREAD */ 421 #define netconn_thread_init() 422 #define netconn_thread_cleanup() 423 #endif /* LWIP_NETCONN_SEM_PER_THREAD */ 424 425 #ifdef __cplusplus 426 } 427 #endif 428 429 #endif /* LWIP_NETCONN || LWIP_SOCKET */ 430 431 #endif /* LWIP_HDR_API_H */ 432