1 /**
2 * @file
3 * Sequential API Main thread module
4 *
5 */
6
7 /*
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without modification,
12 * are permitted provided that the following conditions are met:
13 *
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.
21 *
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
31 * OF SUCH DAMAGE.
32 *
33 * This file is part of the lwIP TCP/IP stack.
34 *
35 * Author: Adam Dunkels <adam@sics.se>
36 *
37 */
38
39 #include "lwip/opt.h"
40
41 #if !NO_SYS /* don't build if not configured for use in lwipopts.h */
42
43 #include "lwip/sys.h"
44 #include "lwip/memp.h"
45 #include "lwip/mem.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"
51
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;
56
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 */
61
62
63 /**
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.
67 *
68 * It also starts all the timers to make sure they are running in the right
69 * thread context.
70 *
71 * @param arg unused argument
72 */
73 static void
tcpip_thread(void * arg)74 tcpip_thread(void *arg)
75 {
76 struct tcpip_msg *msg;
77 LWIP_UNUSED_ARG(arg);
78
79 if (tcpip_init_done != NULL) {
80 tcpip_init_done(tcpip_init_done_arg);
81 }
82
83 LOCK_TCPIP_CORE();
84 while (1) { /* MAIN Loop */
85 UNLOCK_TCPIP_CORE();
86 LWIP_TCPIP_THREAD_ALIVE();
87 /* wait for a message, timeouts are processed while waiting */
88 sys_timeouts_mbox_fetch(&mbox, (void **)&msg);
89 LOCK_TCPIP_CORE();
90 switch (msg->type) {
91 #if LWIP_NETCONN
92 case TCPIP_MSG_API:
93 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", (void *)msg));
94 msg->msg.apimsg->function(&(msg->msg.apimsg->msg));
95 break;
96 #endif /* LWIP_NETCONN */
97
98 #if !LWIP_TCPIP_CORE_LOCKING_INPUT
99 case TCPIP_MSG_INPKT:
100 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
101 #if LWIP_ETHERNET
102 if (msg->msg.inp.netif->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
103 ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
104 } else
105 #endif /* LWIP_ETHERNET */
106 {
107 ip_input(msg->msg.inp.p, msg->msg.inp.netif);
108 }
109 memp_free(MEMP_TCPIP_MSG_INPKT, msg);
110 break;
111 #endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
112
113 #if LWIP_NETIF_API
114 case TCPIP_MSG_NETIFAPI:
115 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Netif API message %p\n", (void *)msg));
116 msg->msg.netifapimsg->function(&(msg->msg.netifapimsg->msg));
117 break;
118 #endif /* LWIP_NETIF_API */
119
120 case TCPIP_MSG_CALLBACK:
121 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
122 msg->msg.cb.function(msg->msg.cb.ctx);
123 memp_free(MEMP_TCPIP_MSG_API, msg);
124 break;
125
126 #if LWIP_TCPIP_TIMEOUT
127 case TCPIP_MSG_TIMEOUT:
128 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: TIMEOUT %p\n", (void *)msg));
129 sys_timeout(msg->msg.tmo.msecs, msg->msg.tmo.h, msg->msg.tmo.arg);
130 memp_free(MEMP_TCPIP_MSG_API, msg);
131 break;
132 case TCPIP_MSG_UNTIMEOUT:
133 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: UNTIMEOUT %p\n", (void *)msg));
134 sys_untimeout(msg->msg.tmo.h, msg->msg.tmo.arg);
135 memp_free(MEMP_TCPIP_MSG_API, msg);
136 break;
137 #endif /* LWIP_TCPIP_TIMEOUT */
138
139 default:
140 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: invalid message: %d\n", msg->type));
141 LWIP_ASSERT("tcpip_thread: invalid message", 0);
142 break;
143 }
144 }
145 }
146
147 /**
148 * Pass a received packet to tcpip_thread for input processing
149 *
150 * @param p the received packet, p->payload pointing to the Ethernet header or
151 * to an IP header (if inp doesn't have NETIF_FLAG_ETHARP or
152 * NETIF_FLAG_ETHERNET flags)
153 * @param inp the network interface on which the packet was received
154 */
155 err_t
tcpip_input(struct pbuf * p,struct netif * inp)156 tcpip_input(struct pbuf *p, struct netif *inp)
157 {
158 #if LWIP_TCPIP_CORE_LOCKING_INPUT
159 err_t ret;
160 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_input: PACKET %p/%p\n", (void *)p, (void *)inp));
161 LOCK_TCPIP_CORE();
162 #if LWIP_ETHERNET
163 if (inp->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
164 ret = ethernet_input(p, inp);
165 } else
166 #endif /* LWIP_ETHERNET */
167 {
168 ret = ip_input(p, inp);
169 }
170 UNLOCK_TCPIP_CORE();
171 return ret;
172 #else /* LWIP_TCPIP_CORE_LOCKING_INPUT */
173 struct tcpip_msg *msg;
174
175 if (sys_mbox_valid(&mbox)) {
176 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_INPKT);
177 if (msg == NULL) {
178 return ERR_MEM;
179 }
180
181 msg->type = TCPIP_MSG_INPKT;
182 msg->msg.inp.p = p;
183 msg->msg.inp.netif = inp;
184 if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
185 memp_free(MEMP_TCPIP_MSG_INPKT, msg);
186 return ERR_MEM;
187 }
188 return ERR_OK;
189 }
190 return ERR_VAL;
191 #endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
192 }
193
194 /**
195 * Call a specific function in the thread context of
196 * tcpip_thread for easy access synchronization.
197 * A function called in that way may access lwIP core code
198 * without fearing concurrent access.
199 *
200 * @param f the function to call
201 * @param ctx parameter passed to f
202 * @param block 1 to block until the request is posted, 0 to non-blocking mode
203 * @return ERR_OK if the function was called, another err_t if not
204 */
205 err_t
tcpip_callback_with_block(tcpip_callback_fn function,void * ctx,u8_t block)206 tcpip_callback_with_block(tcpip_callback_fn function, void *ctx, u8_t block)
207 {
208 struct tcpip_msg *msg;
209
210 if (sys_mbox_valid(&mbox)) {
211 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
212 if (msg == NULL) {
213 return ERR_MEM;
214 }
215
216 msg->type = TCPIP_MSG_CALLBACK;
217 msg->msg.cb.function = function;
218 msg->msg.cb.ctx = ctx;
219 if (block) {
220 sys_mbox_post(&mbox, msg);
221 } else {
222 if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
223 memp_free(MEMP_TCPIP_MSG_API, msg);
224 return ERR_MEM;
225 }
226 }
227 return ERR_OK;
228 }
229 return ERR_VAL;
230 }
231
232 #if LWIP_TCPIP_TIMEOUT
233 /**
234 * call sys_timeout in tcpip_thread
235 *
236 * @param msec time in milliseconds for timeout
237 * @param h function to be called on timeout
238 * @param arg argument to pass to timeout function h
239 * @return ERR_MEM on memory error, ERR_OK otherwise
240 */
241 err_t
tcpip_timeout(u32_t msecs,sys_timeout_handler h,void * arg)242 tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
243 {
244 struct tcpip_msg *msg;
245
246 if (sys_mbox_valid(&mbox)) {
247 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
248 if (msg == NULL) {
249 return ERR_MEM;
250 }
251
252 msg->type = TCPIP_MSG_TIMEOUT;
253 msg->msg.tmo.msecs = msecs;
254 msg->msg.tmo.h = h;
255 msg->msg.tmo.arg = arg;
256 sys_mbox_post(&mbox, msg);
257 return ERR_OK;
258 }
259 return ERR_VAL;
260 }
261
262 /**
263 * call sys_untimeout in tcpip_thread
264 *
265 * @param msec time in milliseconds for timeout
266 * @param h function to be called on timeout
267 * @param arg argument to pass to timeout function h
268 * @return ERR_MEM on memory error, ERR_OK otherwise
269 */
270 err_t
tcpip_untimeout(sys_timeout_handler h,void * arg)271 tcpip_untimeout(sys_timeout_handler h, void *arg)
272 {
273 struct tcpip_msg *msg;
274
275 if (sys_mbox_valid(&mbox)) {
276 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
277 if (msg == NULL) {
278 return ERR_MEM;
279 }
280
281 msg->type = TCPIP_MSG_UNTIMEOUT;
282 msg->msg.tmo.h = h;
283 msg->msg.tmo.arg = arg;
284 sys_mbox_post(&mbox, msg);
285 return ERR_OK;
286 }
287 return ERR_VAL;
288 }
289 #endif /* LWIP_TCPIP_TIMEOUT */
290
291 #if LWIP_NETCONN
292 /**
293 * Call the lower part of a netconn_* function
294 * This function is then running in the thread context
295 * of tcpip_thread and has exclusive access to lwIP core code.
296 *
297 * @param apimsg a struct containing the function to call and its parameters
298 * @return ERR_OK if the function was called, another err_t if not
299 */
300 err_t
tcpip_apimsg(struct api_msg * apimsg)301 tcpip_apimsg(struct api_msg *apimsg)
302 {
303 struct tcpip_msg msg;
304 #ifdef LWIP_DEBUG
305 /* catch functions that don't set err */
306 apimsg->msg.err = ERR_VAL;
307 #endif
308
309 if (sys_mbox_valid(&mbox)) {
310 msg.type = TCPIP_MSG_API;
311 msg.msg.apimsg = apimsg;
312 sys_mbox_post(&mbox, &msg);
313 sys_arch_sem_wait(&apimsg->msg.conn->op_completed, 0);
314 return apimsg->msg.err;
315 }
316 return ERR_VAL;
317 }
318
319 #if LWIP_TCPIP_CORE_LOCKING
320 /**
321 * Call the lower part of a netconn_* function
322 * This function has exclusive access to lwIP core code by locking it
323 * before the function is called.
324 *
325 * @param apimsg a struct containing the function to call and its parameters
326 * @return ERR_OK (only for compatibility fo tcpip_apimsg())
327 */
328 err_t
tcpip_apimsg_lock(struct api_msg * apimsg)329 tcpip_apimsg_lock(struct api_msg *apimsg)
330 {
331 #ifdef LWIP_DEBUG
332 /* catch functions that don't set err */
333 apimsg->msg.err = ERR_VAL;
334 #endif
335
336 LOCK_TCPIP_CORE();
337 apimsg->function(&(apimsg->msg));
338 UNLOCK_TCPIP_CORE();
339 return apimsg->msg.err;
340
341 }
342 #endif /* LWIP_TCPIP_CORE_LOCKING */
343 #endif /* LWIP_NETCONN */
344
345 #if LWIP_NETIF_API
346 #if !LWIP_TCPIP_CORE_LOCKING
347 /**
348 * Much like tcpip_apimsg, but calls the lower part of a netifapi_*
349 * function.
350 *
351 * @param netifapimsg a struct containing the function to call and its parameters
352 * @return error code given back by the function that was called
353 */
354 err_t
tcpip_netifapi(struct netifapi_msg * netifapimsg)355 tcpip_netifapi(struct netifapi_msg* netifapimsg)
356 {
357 struct tcpip_msg msg;
358
359 if (sys_mbox_valid(&mbox)) {
360 err_t err = sys_sem_new(&netifapimsg->msg.sem, 0);
361 if (err != ERR_OK) {
362 netifapimsg->msg.err = err;
363 return err;
364 }
365
366 msg.type = TCPIP_MSG_NETIFAPI;
367 msg.msg.netifapimsg = netifapimsg;
368 sys_mbox_post(&mbox, &msg);
369 sys_sem_wait(&netifapimsg->msg.sem);
370 sys_sem_free(&netifapimsg->msg.sem);
371 return netifapimsg->msg.err;
372 }
373 return ERR_VAL;
374 }
375 #else /* !LWIP_TCPIP_CORE_LOCKING */
376 /**
377 * Call the lower part of a netifapi_* function
378 * This function has exclusive access to lwIP core code by locking it
379 * before the function is called.
380 *
381 * @param netifapimsg a struct containing the function to call and its parameters
382 * @return ERR_OK (only for compatibility fo tcpip_netifapi())
383 */
384 err_t
tcpip_netifapi_lock(struct netifapi_msg * netifapimsg)385 tcpip_netifapi_lock(struct netifapi_msg* netifapimsg)
386 {
387 LOCK_TCPIP_CORE();
388 netifapimsg->function(&(netifapimsg->msg));
389 UNLOCK_TCPIP_CORE();
390 return netifapimsg->msg.err;
391 }
392 #endif /* !LWIP_TCPIP_CORE_LOCKING */
393 #endif /* LWIP_NETIF_API */
394
395 /**
396 * Initialize this module:
397 * - initialize all sub modules
398 * - start the tcpip_thread
399 *
400 * @param initfunc a function to call when tcpip_thread is running and finished initializing
401 * @param arg argument to pass to initfunc
402 */
403 void
tcpip_init(tcpip_init_done_fn initfunc,void * arg)404 tcpip_init(tcpip_init_done_fn initfunc, void *arg)
405 {
406 lwip_init();
407
408 tcpip_init_done = initfunc;
409 tcpip_init_done_arg = arg;
410 if(sys_mbox_new(&mbox, TCPIP_MBOX_SIZE) != ERR_OK) {
411 LWIP_ASSERT("failed to create tcpip_thread mbox", 0);
412 }
413 #if LWIP_TCPIP_CORE_LOCKING
414 if(sys_mutex_new(&lock_tcpip_core) != ERR_OK) {
415 LWIP_ASSERT("failed to create lock_tcpip_core", 0);
416 }
417 #endif /* LWIP_TCPIP_CORE_LOCKING */
418
419 sys_thread_new(TCPIP_THREAD_NAME, tcpip_thread, NULL, TCPIP_THREAD_STACKSIZE, TCPIP_THREAD_PRIO);
420 }
421
422 /**
423 * Simple callback function used with tcpip_callback to free a pbuf
424 * (pbuf_free has a wrong signature for tcpip_callback)
425 *
426 * @param p The pbuf (chain) to be dereferenced.
427 */
428 static void
pbuf_free_int(void * p)429 pbuf_free_int(void *p)
430 {
431 struct pbuf *q = (struct pbuf *)p;
432 pbuf_free(q);
433 }
434
435 /**
436 * A simple wrapper function that allows you to free a pbuf from interrupt context.
437 *
438 * @param p The pbuf (chain) to be dereferenced.
439 * @return ERR_OK if callback could be enqueued, an err_t if not
440 */
441 err_t
pbuf_free_callback(struct pbuf * p)442 pbuf_free_callback(struct pbuf *p)
443 {
444 return tcpip_callback_with_block(pbuf_free_int, p, 0);
445 }
446
447 /**
448 * A simple wrapper function that allows you to free heap memory from
449 * interrupt context.
450 *
451 * @param m the heap memory to free
452 * @return ERR_OK if callback could be enqueued, an err_t if not
453 */
454 err_t
mem_free_callback(void * m)455 mem_free_callback(void *m)
456 {
457 return tcpip_callback_with_block(mem_free, m, 0);
458 }
459
460 #endif /* !NO_SYS */
461