3 * netconn API (to be used from non-TCPIP threads)
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
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.
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
32 * This file is part of the lwIP TCP/IP stack.
34 * Author: Adam Dunkels <adam@sics.se>
37 #ifndef LWIP_HDR_API_H
38 #define LWIP_HDR_API_H
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 */
46 #include "lwip/arch.h"
47 #include "lwip/netbuf.h"
49 #include "lwip/ip_addr.h"
56 /* Throughout this file, IP addresses and port numbers are expected to be in
57 * the same byte order as in the corresponding pcb.
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
67 /* Flags for struct netconn.flags (u8_t) */
68 /** Should this netconn avoid blocking? */
69 #define NETCONN_FLAG_NON_BLOCKING 0x02
70 /** Was the last connect action a non-blocking one? */
71 #define NETCONN_FLAG_IN_NONBLOCKING_CONNECT 0x04
72 /** If a nonblocking write has been rejected before, poll_tcp needs to
73 check if the netconn is writable again */
74 #define NETCONN_FLAG_CHECK_WRITESPACE 0x10
76 /** If this flag is set then only IPv6 communication is allowed on the
77 netconn. As per RFC#3493 this features defaults to OFF allowing
78 dual-stack usage by default. */
79 #define NETCONN_FLAG_IPV6_V6ONLY 0x20
80 #endif /* LWIP_IPV6 */
83 /* Helpers to process several netconn_types by the same code */
84 #define NETCONNTYPE_GROUP(t) ((t)&0xF0)
85 #define NETCONNTYPE_DATAGRAM(t) ((t)&0xE0)
87 #define NETCONN_TYPE_IPV6 0x08
88 #define NETCONNTYPE_ISIPV6(t) (((t)&NETCONN_TYPE_IPV6) != 0)
89 #define NETCONNTYPE_ISUDPLITE(t) (((t)&0xF3) == NETCONN_UDPLITE)
90 #define NETCONNTYPE_ISUDPNOCHKSUM(t) (((t)&0xF3) == NETCONN_UDPNOCHKSUM)
92 #define NETCONNTYPE_ISIPV6(t) (0)
93 #define NETCONNTYPE_ISUDPLITE(t) ((t) == NETCONN_UDPLITE)
94 #define NETCONNTYPE_ISUDPNOCHKSUM(t) ((t) == NETCONN_UDPNOCHKSUM)
95 #endif /* LWIP_IPV6 */
97 /** @ingroup netconn_common
98 * Protocol family and type of the netconn
106 NETCONN_TCP_IPV6 = NETCONN_TCP | NETCONN_TYPE_IPV6 /* 0x18 */,
107 #endif /* LWIP_IPV6 */
111 NETCONN_UDPLITE = 0x21,
112 /** UDP IPv4 no checksum */
113 NETCONN_UDPNOCHKSUM = 0x22,
116 /** UDP IPv6 (dual-stack by default, unless you call @ref netconn_set_ipv6only) */
117 NETCONN_UDP_IPV6 = NETCONN_UDP | NETCONN_TYPE_IPV6 /* 0x28 */,
118 /** UDP IPv6 lite (dual-stack by default, unless you call @ref netconn_set_ipv6only) */
119 NETCONN_UDPLITE_IPV6 = NETCONN_UDPLITE | NETCONN_TYPE_IPV6 /* 0x29 */,
120 /** UDP IPv6 no checksum (dual-stack by default, unless you call @ref netconn_set_ipv6only) */
121 NETCONN_UDPNOCHKSUM_IPV6 = NETCONN_UDPNOCHKSUM | NETCONN_TYPE_IPV6 /* 0x2a */,
122 #endif /* LWIP_IPV6 */
124 /** Raw connection IPv4 */
127 /** Raw connection IPv6 (dual-stack by default, unless you call @ref netconn_set_ipv6only) */
128 , NETCONN_RAW_IPV6 = NETCONN_RAW | NETCONN_TYPE_IPV6 /* 0x48 */
129 #endif /* LWIP_IPV6 */
132 /** Current state of the netconn. Non-TCP netconns are always
133 * in state NETCONN_NONE! */
142 /** Used to inform the callback function about changes
146 * In the netconn implementation, there are three ways to block a client:
148 * - accept mbox (sys_arch_mbox_fetch(&conn->acceptmbox, &accept_ptr, 0); in netconn_accept())
149 * - receive mbox (sys_arch_mbox_fetch(&conn->recvmbox, &buf, 0); in netconn_recv_data())
150 * - send queue is full (sys_arch_sem_wait(LWIP_API_MSG_SEM(msg), 0); in lwip_netconn_do_write())
152 * The events have to be seen as events signaling the state of these mboxes/semaphores. For non-blocking
153 * connections, you need to know in advance whether a call to a netconn function call would block or not,
154 * and these events tell you about that.
156 * RCVPLUS events say: Safe to perform a potentially blocking call call once more.
157 * They are counted in sockets - three RCVPLUS events for accept mbox means you are safe
158 * to call netconn_accept 3 times without being blocked.
159 * Same thing for receive mbox.
161 * RCVMINUS events say: Your call to to a possibly blocking function is "acknowledged".
162 * Socket implementation decrements the counter.
164 * For TX, there is no need to count, its merely a flag. SENDPLUS means you may send something.
165 * SENDPLUS occurs when enough data was delivered to peer so netconn_send() can be called again.
166 * A SENDMINUS event occurs when the next call to a netconn_send() would be blocking.
170 NETCONN_EVT_RCVMINUS,
171 NETCONN_EVT_SENDPLUS,
172 NETCONN_EVT_SENDMINUS,
176 #if LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD)
177 /** Used for netconn_join_leave_group() */
182 #endif /* LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) */
185 /* Used for netconn_gethostbyname_addrtype(), these should match the DNS_ADDRTYPE defines in dns.h */
186 #define NETCONN_DNS_DEFAULT NETCONN_DNS_IPV4_IPV6
187 #define NETCONN_DNS_IPV4 0
188 #define NETCONN_DNS_IPV6 1
189 #define NETCONN_DNS_IPV4_IPV6 2 /* try to resolve IPv4 first, try IPv6 if IPv4 fails only */
190 #define NETCONN_DNS_IPV6_IPV4 3 /* try to resolve IPv6 first, try IPv4 if IPv6 fails only */
191 #endif /* LWIP_DNS */
193 /* forward-declare some structs to avoid to include their headers */
201 /** A callback prototype to inform about events for a netconn */
202 typedef void (* netconn_callback)(struct netconn *, enum netconn_evt, u16_t len);
204 /** A netconn descriptor */
206 /** type of the netconn (TCP, UDP or RAW) */
207 enum netconn_type type;
208 /** current state of the netconn */
209 enum netconn_state state;
210 /** the lwIP internal protocol control block */
217 /** the last error this netconn had */
219 #if !LWIP_NETCONN_SEM_PER_THREAD
220 /** sem that is used to synchronously execute functions in the core context */
221 sys_sem_t op_completed;
223 /** mbox where received packets are stored until they are fetched
224 by the netconn application thread (can grow quite big) */
227 /** mbox where new connections are stored until processed
228 by the application thread */
229 sys_mbox_t acceptmbox;
230 #endif /* LWIP_TCP */
231 /** only used for socket layer */
234 #endif /* LWIP_SOCKET */
236 /** timeout to wait for sending data (which means enqueueing data for sending
237 in internal buffers) in milliseconds */
239 #endif /* LWIP_SO_RCVTIMEO */
241 /** timeout in milliseconds to wait for new data to be received
242 (or connections to arrive for listening netconns) */
244 #endif /* LWIP_SO_RCVTIMEO */
246 /** maximum amount of bytes queued in recvmbox
247 not used for TCP: adjust TCP_WND instead! */
249 /** number of bytes currently in recvmbox to be received,
250 tested against recv_bufsize to limit bytes on recvmbox
251 for UDP and RAW, used for FIONREAD */
253 #endif /* LWIP_SO_RCVBUF */
255 /** values <0 mean linger is disabled, values > 0 are seconds to linger */
257 #endif /* LWIP_SO_LINGER */
258 /** flags holding more netconn-internal state, see NETCONN_FLAG_* defines */
261 /** TCP: when data passed to netconn_write doesn't fit into the send buffer,
262 this temporarily stores how much is already sent. */
264 /** TCP: when data passed to netconn_write doesn't fit into the send buffer,
265 this temporarily stores the message.
266 Also used during connect and close. */
267 struct api_msg *current_msg;
268 #endif /* LWIP_TCP */
269 /** A callback function that is informed about events for this netconn */
270 netconn_callback callback;
273 /** Register an Network connection event */
274 #define API_EVENT(c,e,l) if (c->callback) { \
275 (*c->callback)(c, e, l); \
278 /** Set conn->last_err to err but don't overwrite fatal errors */
279 #define NETCONN_SET_SAFE_ERR(conn, err) do { if ((conn) != NULL) { \
280 SYS_ARCH_DECL_PROTECT(netconn_set_safe_err_lev); \
281 SYS_ARCH_PROTECT(netconn_set_safe_err_lev); \
282 if (!ERR_IS_FATAL((conn)->last_err)) { \
283 (conn)->last_err = err; \
285 SYS_ARCH_UNPROTECT(netconn_set_safe_err_lev); \
288 /* Network connection functions: */
290 /** @ingroup netconn_common
291 * Create new netconn connection
292 * @param t @ref netconn_type */
293 #define netconn_new(t) netconn_new_with_proto_and_callback(t, 0, NULL)
294 #define netconn_new_with_callback(t, c) netconn_new_with_proto_and_callback(t, 0, c)
295 struct netconn *netconn_new_with_proto_and_callback(enum netconn_type t, u8_t proto,
296 netconn_callback callback);
297 err_t netconn_delete(struct netconn *conn);
298 /** Get the type of a netconn (as enum netconn_type). */
299 #define netconn_type(conn) (conn->type)
301 err_t netconn_getaddr(struct netconn *conn, ip_addr_t *addr,
302 u16_t *port, u8_t local);
303 /** @ingroup netconn_common */
304 #define netconn_peer(c,i,p) netconn_getaddr(c,i,p,0)
305 /** @ingroup netconn_common */
306 #define netconn_addr(c,i,p) netconn_getaddr(c,i,p,1)
308 err_t netconn_bind(struct netconn *conn, const ip_addr_t *addr, u16_t port);
309 err_t netconn_connect(struct netconn *conn, const ip_addr_t *addr, u16_t port);
310 err_t netconn_disconnect (struct netconn *conn);
311 err_t netconn_listen_with_backlog(struct netconn *conn, u8_t backlog);
312 /** @ingroup netconn_tcp */
313 #define netconn_listen(conn) netconn_listen_with_backlog(conn, TCP_DEFAULT_LISTEN_BACKLOG)
314 err_t netconn_accept(struct netconn *conn, struct netconn **new_conn);
315 err_t netconn_recv(struct netconn *conn, struct netbuf **new_buf);
316 err_t netconn_recv_tcp_pbuf(struct netconn *conn, struct pbuf **new_buf);
317 err_t netconn_sendto(struct netconn *conn, struct netbuf *buf,
318 const ip_addr_t *addr, u16_t port);
319 err_t netconn_send(struct netconn *conn, struct netbuf *buf);
320 err_t netconn_write_partly(struct netconn *conn, const void *dataptr, size_t size,
321 u8_t apiflags, size_t *bytes_written);
322 /** @ingroup netconn_tcp */
323 #define netconn_write(conn, dataptr, size, apiflags) \
324 netconn_write_partly(conn, dataptr, size, apiflags, NULL)
325 err_t netconn_close(struct netconn *conn);
326 err_t netconn_shutdown(struct netconn *conn, u8_t shut_rx, u8_t shut_tx);
328 #if LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD)
329 err_t netconn_join_leave_group(struct netconn *conn, const ip_addr_t *multiaddr,
330 const ip_addr_t *netif_addr, enum netconn_igmp join_or_leave);
331 #endif /* LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) */
333 #if LWIP_IPV4 && LWIP_IPV6
334 err_t netconn_gethostbyname_addrtype(const char *name, ip_addr_t *addr, u8_t dns_addrtype);
335 #define netconn_gethostbyname(name, addr) netconn_gethostbyname_addrtype(name, addr, NETCONN_DNS_DEFAULT)
336 #else /* LWIP_IPV4 && LWIP_IPV6 */
337 err_t netconn_gethostbyname(const char *name, ip_addr_t *addr);
338 #define netconn_gethostbyname_addrtype(name, addr, dns_addrtype) netconn_gethostbyname(name, addr)
339 #endif /* LWIP_IPV4 && LWIP_IPV6 */
340 #endif /* LWIP_DNS */
342 #define netconn_err(conn) ((conn)->last_err)
343 #define netconn_recv_bufsize(conn) ((conn)->recv_bufsize)
345 /** Set the blocking status of netconn calls (@todo: write/send is missing) */
346 #define netconn_set_nonblocking(conn, val) do { if(val) { \
347 (conn)->flags |= NETCONN_FLAG_NON_BLOCKING; \
349 (conn)->flags &= ~ NETCONN_FLAG_NON_BLOCKING; }} while(0)
350 /** Get the blocking status of netconn calls (@todo: write/send is missing) */
351 #define netconn_is_nonblocking(conn) (((conn)->flags & NETCONN_FLAG_NON_BLOCKING) != 0)
354 /** @ingroup netconn_common
355 * TCP: Set the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY)
357 #define netconn_set_ipv6only(conn, val) do { if(val) { \
358 (conn)->flags |= NETCONN_FLAG_IPV6_V6ONLY; \
360 (conn)->flags &= ~ NETCONN_FLAG_IPV6_V6ONLY; }} while(0)
361 /** @ingroup netconn_common
362 * TCP: Get the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY)
364 #define netconn_get_ipv6only(conn) (((conn)->flags & NETCONN_FLAG_IPV6_V6ONLY) != 0)
365 #endif /* LWIP_IPV6 */
368 /** Set the send timeout in milliseconds */
369 #define netconn_set_sendtimeout(conn, timeout) ((conn)->send_timeout = (timeout))
370 /** Get the send timeout in milliseconds */
371 #define netconn_get_sendtimeout(conn) ((conn)->send_timeout)
372 #endif /* LWIP_SO_SNDTIMEO */
374 /** Set the receive timeout in milliseconds */
375 #define netconn_set_recvtimeout(conn, timeout) ((conn)->recv_timeout = (timeout))
376 /** Get the receive timeout in milliseconds */
377 #define netconn_get_recvtimeout(conn) ((conn)->recv_timeout)
378 #endif /* LWIP_SO_RCVTIMEO */
380 /** Set the receive buffer in bytes */
381 #define netconn_set_recvbufsize(conn, recvbufsize) ((conn)->recv_bufsize = (recvbufsize))
382 /** Get the receive buffer in bytes */
383 #define netconn_get_recvbufsize(conn) ((conn)->recv_bufsize)
384 #endif /* LWIP_SO_RCVBUF*/
386 #if LWIP_NETCONN_SEM_PER_THREAD
387 void netconn_thread_init(void);
388 void netconn_thread_cleanup(void);
389 #else /* LWIP_NETCONN_SEM_PER_THREAD */
390 #define netconn_thread_init()
391 #define netconn_thread_cleanup()
392 #endif /* LWIP_NETCONN_SEM_PER_THREAD */
398 #endif /* LWIP_NETCONN || LWIP_SOCKET */
400 #endif /* LWIP_HDR_API_H */