3 * Sequential API Main thread module
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
11 * Redistribution and use in source and binary forms, with or without modification,
12 * are permitted provided that the following conditions are met:
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
18 * and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
33 * This file is part of the lwIP TCP/IP stack.
35 * Author: Adam Dunkels <adam@sics.se>
41 #if !NO_SYS /* don't build if not configured for use in lwipopts.h */
44 #include "lwip/memp.h"
46 #include "lwip/pbuf.h"
47 #include "lwip/tcpip.h"
48 #include "lwip/init.h"
49 #include "netif/etharp.h"
50 #include "netif/ppp_oe.h"
52 /* global variables */
53 static tcpip_init_done_fn tcpip_init_done;
54 static void *tcpip_init_done_arg;
55 static sys_mbox_t mbox;
57 #if LWIP_TCPIP_CORE_LOCKING
58 /** The global semaphore to lock the stack. */
59 sys_mutex_t lock_tcpip_core;
60 #endif /* LWIP_TCPIP_CORE_LOCKING */
64 * The main lwIP thread. This thread has exclusive access to lwIP core functions
65 * (unless access to them is not locked). Other threads communicate with this
66 * thread using message boxes.
68 * It also starts all the timers to make sure they are running in the right
71 * @param arg unused argument
74 tcpip_thread(void *arg)
76 struct tcpip_msg *msg;
79 if (tcpip_init_done != NULL) {
80 tcpip_init_done(tcpip_init_done_arg);
84 while (1) { /* MAIN Loop */
86 LWIP_TCPIP_THREAD_ALIVE();
87 /* wait for a message, timeouts are processed while waiting */
88 sys_timeouts_mbox_fetch(&mbox, (void **)&msg);
93 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", (void *)msg));
94 msg->msg.apimsg->function(&(msg->msg.apimsg->msg));
96 #endif /* LWIP_NETCONN */
98 #if !LWIP_TCPIP_CORE_LOCKING_INPUT
100 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
102 if (msg->msg.inp.netif->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
103 ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
105 #endif /* LWIP_ETHERNET */
107 if ((*((unsigned char *)(msg->msg.inp.p->payload)) & 0xf0) == 0x60) {
108 ip6_input(msg->msg.inp.p, msg->msg.inp.netif);
110 #endif /* LWIP_IPV6 */
112 ip_input(msg->msg.inp.p, msg->msg.inp.netif);
114 memp_free(MEMP_TCPIP_MSG_INPKT, msg);
116 #endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
119 case TCPIP_MSG_NETIFAPI:
120 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Netif API message %p\n", (void *)msg));
121 msg->msg.netifapimsg->function(&(msg->msg.netifapimsg->msg));
123 #endif /* LWIP_NETIF_API */
125 #if LWIP_TCPIP_TIMEOUT
126 case TCPIP_MSG_TIMEOUT:
127 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: TIMEOUT %p\n", (void *)msg));
128 sys_timeout(msg->msg.tmo.msecs, msg->msg.tmo.h, msg->msg.tmo.arg);
129 memp_free(MEMP_TCPIP_MSG_API, msg);
131 case TCPIP_MSG_UNTIMEOUT:
132 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: UNTIMEOUT %p\n", (void *)msg));
133 sys_untimeout(msg->msg.tmo.h, msg->msg.tmo.arg);
134 memp_free(MEMP_TCPIP_MSG_API, msg);
136 #endif /* LWIP_TCPIP_TIMEOUT */
138 case TCPIP_MSG_CALLBACK:
139 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
140 msg->msg.cb.function(msg->msg.cb.ctx);
141 memp_free(MEMP_TCPIP_MSG_API, msg);
144 case TCPIP_MSG_CALLBACK_STATIC:
145 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK_STATIC %p\n", (void *)msg));
146 msg->msg.cb.function(msg->msg.cb.ctx);
150 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: invalid message: %d\n", msg->type));
151 LWIP_ASSERT("tcpip_thread: invalid message", 0);
158 * Pass a received packet to tcpip_thread for input processing
160 * @param p the received packet, p->payload pointing to the Ethernet header or
161 * to an IP header (if inp doesn't have NETIF_FLAG_ETHARP or
162 * NETIF_FLAG_ETHERNET flags)
163 * @param inp the network interface on which the packet was received
166 tcpip_input(struct pbuf *p, struct netif *inp)
168 #if LWIP_TCPIP_CORE_LOCKING_INPUT
170 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_input: PACKET %p/%p\n", (void *)p, (void *)inp));
173 if (inp->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
174 ret = ethernet_input(p, inp);
176 #endif /* LWIP_ETHERNET */
178 ret = ip_input(p, inp);
182 #else /* LWIP_TCPIP_CORE_LOCKING_INPUT */
183 struct tcpip_msg *msg;
185 if (!sys_mbox_valid(&mbox)) {
188 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_INPKT);
193 msg->type = TCPIP_MSG_INPKT;
195 msg->msg.inp.netif = inp;
196 if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
197 memp_free(MEMP_TCPIP_MSG_INPKT, msg);
201 #endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
205 * Call a specific function in the thread context of
206 * tcpip_thread for easy access synchronization.
207 * A function called in that way may access lwIP core code
208 * without fearing concurrent access.
210 * @param f the function to call
211 * @param ctx parameter passed to f
212 * @param block 1 to block until the request is posted, 0 to non-blocking mode
213 * @return ERR_OK if the function was called, another err_t if not
216 tcpip_callback_with_block(tcpip_callback_fn function, void *ctx, u8_t block)
218 struct tcpip_msg *msg;
220 if (sys_mbox_valid(&mbox)) {
221 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
226 msg->type = TCPIP_MSG_CALLBACK;
227 msg->msg.cb.function = function;
228 msg->msg.cb.ctx = ctx;
230 sys_mbox_post(&mbox, msg);
232 if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
233 memp_free(MEMP_TCPIP_MSG_API, msg);
242 #if LWIP_TCPIP_TIMEOUT
244 * call sys_timeout in tcpip_thread
246 * @param msec time in milliseconds for timeout
247 * @param h function to be called on timeout
248 * @param arg argument to pass to timeout function h
249 * @return ERR_MEM on memory error, ERR_OK otherwise
252 tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
254 struct tcpip_msg *msg;
256 if (sys_mbox_valid(&mbox)) {
257 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
262 msg->type = TCPIP_MSG_TIMEOUT;
263 msg->msg.tmo.msecs = msecs;
265 msg->msg.tmo.arg = arg;
266 sys_mbox_post(&mbox, msg);
273 * call sys_untimeout in tcpip_thread
275 * @param msec time in milliseconds for timeout
276 * @param h function to be called on timeout
277 * @param arg argument to pass to timeout function h
278 * @return ERR_MEM on memory error, ERR_OK otherwise
281 tcpip_untimeout(sys_timeout_handler h, void *arg)
283 struct tcpip_msg *msg;
285 if (sys_mbox_valid(&mbox)) {
286 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
291 msg->type = TCPIP_MSG_UNTIMEOUT;
293 msg->msg.tmo.arg = arg;
294 sys_mbox_post(&mbox, msg);
299 #endif /* LWIP_TCPIP_TIMEOUT */
303 * Call the lower part of a netconn_* function
304 * This function is then running in the thread context
305 * of tcpip_thread and has exclusive access to lwIP core code.
307 * @param apimsg a struct containing the function to call and its parameters
308 * @return ERR_OK if the function was called, another err_t if not
311 tcpip_apimsg(struct api_msg *apimsg)
313 struct tcpip_msg msg;
315 /* catch functions that don't set err */
316 apimsg->msg.err = ERR_VAL;
319 if (sys_mbox_valid(&mbox)) {
320 msg.type = TCPIP_MSG_API;
321 msg.msg.apimsg = apimsg;
322 sys_mbox_post(&mbox, &msg);
323 sys_arch_sem_wait(&apimsg->msg.conn->op_completed, 0);
324 return apimsg->msg.err;
329 #if LWIP_TCPIP_CORE_LOCKING
331 * Call the lower part of a netconn_* function
332 * This function has exclusive access to lwIP core code by locking it
333 * before the function is called.
335 * @param apimsg a struct containing the function to call and its parameters
336 * @return ERR_OK (only for compatibility fo tcpip_apimsg())
339 tcpip_apimsg_lock(struct api_msg *apimsg)
342 /* catch functions that don't set err */
343 apimsg->msg.err = ERR_VAL;
347 apimsg->function(&(apimsg->msg));
349 return apimsg->msg.err;
352 #endif /* LWIP_TCPIP_CORE_LOCKING */
353 #endif /* LWIP_NETCONN */
356 #if !LWIP_TCPIP_CORE_LOCKING
358 * Much like tcpip_apimsg, but calls the lower part of a netifapi_*
361 * @param netifapimsg a struct containing the function to call and its parameters
362 * @return error code given back by the function that was called
365 tcpip_netifapi(struct netifapi_msg* netifapimsg)
367 struct tcpip_msg msg;
369 if (sys_mbox_valid(&mbox)) {
370 err_t err = sys_sem_new(&netifapimsg->msg.sem, 0);
372 netifapimsg->msg.err = err;
376 msg.type = TCPIP_MSG_NETIFAPI;
377 msg.msg.netifapimsg = netifapimsg;
378 sys_mbox_post(&mbox, &msg);
379 sys_sem_wait(&netifapimsg->msg.sem);
380 sys_sem_free(&netifapimsg->msg.sem);
381 return netifapimsg->msg.err;
385 #else /* !LWIP_TCPIP_CORE_LOCKING */
387 * Call the lower part of a netifapi_* function
388 * This function has exclusive access to lwIP core code by locking it
389 * before the function is called.
391 * @param netifapimsg a struct containing the function to call and its parameters
392 * @return ERR_OK (only for compatibility fo tcpip_netifapi())
395 tcpip_netifapi_lock(struct netifapi_msg* netifapimsg)
398 netifapimsg->function(&(netifapimsg->msg));
400 return netifapimsg->msg.err;
402 #endif /* !LWIP_TCPIP_CORE_LOCKING */
403 #endif /* LWIP_NETIF_API */
406 * Allocate a structure for a static callback message and initialize it.
407 * This is intended to be used to send "static" messages from interrupt context.
409 * @param function the function to call
410 * @param ctx parameter passed to function
411 * @return a struct pointer to pass to tcpip_trycallback().
413 struct tcpip_callback_msg* tcpip_callbackmsg_new(tcpip_callback_fn function, void *ctx)
415 struct tcpip_msg *msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
419 msg->type = TCPIP_MSG_CALLBACK_STATIC;
420 msg->msg.cb.function = function;
421 msg->msg.cb.ctx = ctx;
422 return (struct tcpip_callback_msg*)msg;
426 * Free a callback message allocated by tcpip_callbackmsg_new().
428 * @param msg the message to free
430 void tcpip_callbackmsg_delete(struct tcpip_callback_msg* msg)
432 memp_free(MEMP_TCPIP_MSG_API, msg);
436 * Try to post a callback-message to the tcpip_thread mbox
437 * This is intended to be used to send "static" messages from interrupt context.
439 * @param msg pointer to the message to post
440 * @return sys_mbox_trypost() return code
443 tcpip_trycallback(struct tcpip_callback_msg* msg)
445 if (!sys_mbox_valid(&mbox)) {
448 return sys_mbox_trypost(&mbox, msg);
452 * Initialize this module:
453 * - initialize all sub modules
454 * - start the tcpip_thread
456 * @param initfunc a function to call when tcpip_thread is running and finished initializing
457 * @param arg argument to pass to initfunc
460 tcpip_init(tcpip_init_done_fn initfunc, void *arg)
464 tcpip_init_done = initfunc;
465 tcpip_init_done_arg = arg;
466 if(sys_mbox_new(&mbox, TCPIP_MBOX_SIZE) != ERR_OK) {
467 LWIP_ASSERT("failed to create tcpip_thread mbox", 0);
469 #if LWIP_TCPIP_CORE_LOCKING
470 if(sys_mutex_new(&lock_tcpip_core) != ERR_OK) {
471 LWIP_ASSERT("failed to create lock_tcpip_core", 0);
473 #endif /* LWIP_TCPIP_CORE_LOCKING */
475 sys_thread_new(TCPIP_THREAD_NAME, tcpip_thread, NULL, TCPIP_THREAD_STACKSIZE, TCPIP_THREAD_PRIO);
479 * Simple callback function used with tcpip_callback to free a pbuf
480 * (pbuf_free has a wrong signature for tcpip_callback)
482 * @param p The pbuf (chain) to be dereferenced.
485 pbuf_free_int(void *p)
487 struct pbuf *q = (struct pbuf *)p;
492 * A simple wrapper function that allows you to free a pbuf from interrupt context.
494 * @param p The pbuf (chain) to be dereferenced.
495 * @return ERR_OK if callback could be enqueued, an err_t if not
498 pbuf_free_callback(struct pbuf *p)
500 return tcpip_callback_with_block(pbuf_free_int, p, 0);
504 * A simple wrapper function that allows you to free heap memory from
507 * @param m the heap memory to free
508 * @return ERR_OK if callback could be enqueued, an err_t if not
511 mem_free_callback(void *m)
513 return tcpip_callback_with_block(mem_free, m, 0);