source: UsbWattMeter/trunk/lwip-1.4.1/src/include/lwip/tcp_impl.h@ 164

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TOPPERS/ECNLサンプルアプリ「USB充電器電力計」を追加
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[164]1/*
2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
25 * OF SUCH DAMAGE.
26 *
27 * This file is part of the lwIP TCP/IP stack.
28 *
29 * Author: Adam Dunkels <adam@sics.se>
30 *
31 */
32#ifndef __LWIP_TCP_IMPL_H__
33#define __LWIP_TCP_IMPL_H__
34
35#include "lwip/opt.h"
36
37#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
38
39#include "lwip/tcp.h"
40#include "lwip/mem.h"
41#include "lwip/pbuf.h"
42#include "lwip/ip.h"
43#include "lwip/icmp.h"
44#include "lwip/err.h"
45
46#ifdef __cplusplus
47extern "C" {
48#endif
49
50/* Functions for interfacing with TCP: */
51
52/* Lower layer interface to TCP: */
53void tcp_init (void); /* Initialize this module. */
54void tcp_tmr (void); /* Must be called every
55 TCP_TMR_INTERVAL
56 ms. (Typically 250 ms). */
57/* It is also possible to call these two functions at the right
58 intervals (instead of calling tcp_tmr()). */
59void tcp_slowtmr (void);
60void tcp_fasttmr (void);
61
62
63/* Only used by IP to pass a TCP segment to TCP: */
64void tcp_input (struct pbuf *p, struct netif *inp);
65/* Used within the TCP code only: */
66struct tcp_pcb * tcp_alloc (u8_t prio);
67void tcp_abandon (struct tcp_pcb *pcb, int reset);
68err_t tcp_send_empty_ack(struct tcp_pcb *pcb);
69void tcp_rexmit (struct tcp_pcb *pcb);
70void tcp_rexmit_rto (struct tcp_pcb *pcb);
71void tcp_rexmit_fast (struct tcp_pcb *pcb);
72u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb);
73err_t tcp_process_refused_data(struct tcp_pcb *pcb);
74
75/**
76 * This is the Nagle algorithm: try to combine user data to send as few TCP
77 * segments as possible. Only send if
78 * - no previously transmitted data on the connection remains unacknowledged or
79 * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or
80 * - the only unsent segment is at least pcb->mss bytes long (or there is more
81 * than one unsent segment - with lwIP, this can happen although unsent->len < mss)
82 * - or if we are in fast-retransmit (TF_INFR)
83 */
84#define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \
85 ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \
86 (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \
87 ((tpcb)->unsent->len >= (tpcb)->mss))) || \
88 ((tcp_sndbuf(tpcb) == 0) || (tcp_sndqueuelen(tpcb) >= TCP_SND_QUEUELEN)) \
89 ) ? 1 : 0)
90#define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)
91
92
93#define TCP_SEQ_LT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) < 0)
94#define TCP_SEQ_LEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) <= 0)
95#define TCP_SEQ_GT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) > 0)
96#define TCP_SEQ_GEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) >= 0)
97/* is b<=a<=c? */
98#if 0 /* see bug #10548 */
99#define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
100#endif
101#define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
102#define TCP_FIN 0x01U
103#define TCP_SYN 0x02U
104#define TCP_RST 0x04U
105#define TCP_PSH 0x08U
106#define TCP_ACK 0x10U
107#define TCP_URG 0x20U
108#define TCP_ECE 0x40U
109#define TCP_CWR 0x80U
110
111#define TCP_FLAGS 0x3fU
112
113/* Length of the TCP header, excluding options. */
114#define TCP_HLEN 20
115
116#ifndef TCP_TMR_INTERVAL
117#define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */
118#endif /* TCP_TMR_INTERVAL */
119
120#ifndef TCP_FAST_INTERVAL
121#define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */
122#endif /* TCP_FAST_INTERVAL */
123
124#ifndef TCP_SLOW_INTERVAL
125#define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */
126#endif /* TCP_SLOW_INTERVAL */
127
128#define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
129#define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */
130
131#define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
132
133#ifndef TCP_MSL
134#define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */
135#endif
136
137/* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */
138#ifndef TCP_KEEPIDLE_DEFAULT
139#define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */
140#endif
141
142#ifndef TCP_KEEPINTVL_DEFAULT
143#define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */
144#endif
145
146#ifndef TCP_KEEPCNT_DEFAULT
147#define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */
148#endif
149
150#define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */
151
152/* Fields are (of course) in network byte order.
153 * Some fields are converted to host byte order in tcp_input().
154 */
155#ifdef PACK_STRUCT_USE_INCLUDES
156# include "arch/bpstruct.h"
157#endif
158PACK_STRUCT_BEGIN
159struct tcp_hdr {
160 PACK_STRUCT_FIELD(u16_t src);
161 PACK_STRUCT_FIELD(u16_t dest);
162 PACK_STRUCT_FIELD(u32_t seqno);
163 PACK_STRUCT_FIELD(u32_t ackno);
164 PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags);
165 PACK_STRUCT_FIELD(u16_t wnd);
166 PACK_STRUCT_FIELD(u16_t chksum);
167 PACK_STRUCT_FIELD(u16_t urgp);
168} PACK_STRUCT_STRUCT;
169PACK_STRUCT_END
170#ifdef PACK_STRUCT_USE_INCLUDES
171# include "arch/epstruct.h"
172#endif
173
174#define TCPH_HDRLEN(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 12)
175#define TCPH_FLAGS(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS)
176
177#define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | TCPH_FLAGS(phdr))
178#define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = (((phdr)->_hdrlen_rsvd_flags & PP_HTONS((u16_t)(~(u16_t)(TCP_FLAGS)))) | htons(flags))
179#define TCPH_HDRLEN_FLAGS_SET(phdr, len, flags) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | (flags))
180
181#define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags | htons(flags))
182#define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) | (TCPH_FLAGS(phdr) & ~(flags)) )
183
184#define TCP_TCPLEN(seg) ((seg)->len + ((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0))
185
186/** Flags used on input processing, not on pcb->flags
187*/
188#define TF_RESET (u8_t)0x08U /* Connection was reset. */
189#define TF_CLOSED (u8_t)0x10U /* Connection was sucessfully closed. */
190#define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */
191
192
193#if LWIP_EVENT_API
194
195#define TCP_EVENT_ACCEPT(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
196 LWIP_EVENT_ACCEPT, NULL, 0, err)
197#define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
198 LWIP_EVENT_SENT, NULL, space, ERR_OK)
199#define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
200 LWIP_EVENT_RECV, (p), 0, (err))
201#define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
202 LWIP_EVENT_RECV, NULL, 0, ERR_OK)
203#define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
204 LWIP_EVENT_CONNECTED, NULL, 0, (err))
205#define TCP_EVENT_POLL(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
206 LWIP_EVENT_POLL, NULL, 0, ERR_OK)
207#define TCP_EVENT_ERR(errf,arg,err) lwip_tcp_event((arg), NULL, \
208 LWIP_EVENT_ERR, NULL, 0, (err))
209
210#else /* LWIP_EVENT_API */
211
212#define TCP_EVENT_ACCEPT(pcb,err,ret) \
213 do { \
214 if((pcb)->accept != NULL) \
215 (ret) = (pcb)->accept((pcb)->callback_arg,(pcb),(err)); \
216 else (ret) = ERR_ARG; \
217 } while (0)
218
219#define TCP_EVENT_SENT(pcb,space,ret) \
220 do { \
221 if((pcb)->sent != NULL) \
222 (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \
223 else (ret) = ERR_OK; \
224 } while (0)
225
226#define TCP_EVENT_RECV(pcb,p,err,ret) \
227 do { \
228 if((pcb)->recv != NULL) { \
229 (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\
230 } else { \
231 (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \
232 } \
233 } while (0)
234
235#define TCP_EVENT_CLOSED(pcb,ret) \
236 do { \
237 if(((pcb)->recv != NULL)) { \
238 (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\
239 } else { \
240 (ret) = ERR_OK; \
241 } \
242 } while (0)
243
244#define TCP_EVENT_CONNECTED(pcb,err,ret) \
245 do { \
246 if((pcb)->connected != NULL) \
247 (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \
248 else (ret) = ERR_OK; \
249 } while (0)
250
251#define TCP_EVENT_POLL(pcb,ret) \
252 do { \
253 if((pcb)->poll != NULL) \
254 (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \
255 else (ret) = ERR_OK; \
256 } while (0)
257
258#define TCP_EVENT_ERR(errf,arg,err) \
259 do { \
260 if((errf) != NULL) \
261 (errf)((arg),(err)); \
262 } while (0)
263
264#endif /* LWIP_EVENT_API */
265
266/** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */
267#if TCP_OVERSIZE && defined(LWIP_DEBUG)
268#define TCP_OVERSIZE_DBGCHECK 1
269#else
270#define TCP_OVERSIZE_DBGCHECK 0
271#endif
272
273/** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */
274#define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP)
275
276/* This structure represents a TCP segment on the unsent, unacked and ooseq queues */
277struct tcp_seg {
278 struct tcp_seg *next; /* used when putting segements on a queue */
279 struct pbuf *p; /* buffer containing data + TCP header */
280 u16_t len; /* the TCP length of this segment */
281#if TCP_OVERSIZE_DBGCHECK
282 u16_t oversize_left; /* Extra bytes available at the end of the last
283 pbuf in unsent (used for asserting vs.
284 tcp_pcb.unsent_oversized only) */
285#endif /* TCP_OVERSIZE_DBGCHECK */
286#if TCP_CHECKSUM_ON_COPY
287 u16_t chksum;
288 u8_t chksum_swapped;
289#endif /* TCP_CHECKSUM_ON_COPY */
290 u8_t flags;
291#define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option. */
292#define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */
293#define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is
294 checksummed into 'chksum' */
295 struct tcp_hdr *tcphdr; /* the TCP header */
296};
297
298#define LWIP_TCP_OPT_LENGTH(flags) \
299 (flags & TF_SEG_OPTS_MSS ? 4 : 0) + \
300 (flags & TF_SEG_OPTS_TS ? 12 : 0)
301
302/** This returns a TCP header option for MSS in an u32_t */
303#define TCP_BUILD_MSS_OPTION(mss) htonl(0x02040000 | ((mss) & 0xFFFF))
304
305/* Global variables: */
306extern struct tcp_pcb *tcp_input_pcb;
307extern u32_t tcp_ticks;
308extern u8_t tcp_active_pcbs_changed;
309
310/* The TCP PCB lists. */
311union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */
312 struct tcp_pcb_listen *listen_pcbs;
313 struct tcp_pcb *pcbs;
314};
315extern struct tcp_pcb *tcp_bound_pcbs;
316extern union tcp_listen_pcbs_t tcp_listen_pcbs;
317extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a
318 state in which they accept or send
319 data. */
320extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */
321
322extern struct tcp_pcb *tcp_tmp_pcb; /* Only used for temporary storage. */
323
324/* Axioms about the above lists:
325 1) Every TCP PCB that is not CLOSED is in one of the lists.
326 2) A PCB is only in one of the lists.
327 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
328 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
329*/
330/* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
331 with a PCB list or removes a PCB from a list, respectively. */
332#ifndef TCP_DEBUG_PCB_LISTS
333#define TCP_DEBUG_PCB_LISTS 0
334#endif
335#if TCP_DEBUG_PCB_LISTS
336#define TCP_REG(pcbs, npcb) do {\
337 LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", (npcb), (npcb)->local_port)); \
338 for(tcp_tmp_pcb = *(pcbs); \
339 tcp_tmp_pcb != NULL; \
340 tcp_tmp_pcb = tcp_tmp_pcb->next) { \
341 LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \
342 } \
343 LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \
344 (npcb)->next = *(pcbs); \
345 LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \
346 *(pcbs) = (npcb); \
347 LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
348 tcp_timer_needed(); \
349 } while(0)
350#define TCP_RMV(pcbs, npcb) do { \
351 LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \
352 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (npcb), *(pcbs))); \
353 if(*(pcbs) == (npcb)) { \
354 *(pcbs) = (*pcbs)->next; \
355 } else for(tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
356 if(tcp_tmp_pcb->next == (npcb)) { \
357 tcp_tmp_pcb->next = (npcb)->next; \
358 break; \
359 } \
360 } \
361 (npcb)->next = NULL; \
362 LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
363 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (npcb), *(pcbs))); \
364 } while(0)
365
366#else /* LWIP_DEBUG */
367
368#define TCP_REG(pcbs, npcb) \
369 do { \
370 (npcb)->next = *pcbs; \
371 *(pcbs) = (npcb); \
372 tcp_timer_needed(); \
373 } while (0)
374
375#define TCP_RMV(pcbs, npcb) \
376 do { \
377 if(*(pcbs) == (npcb)) { \
378 (*(pcbs)) = (*pcbs)->next; \
379 } \
380 else { \
381 for(tcp_tmp_pcb = *pcbs; \
382 tcp_tmp_pcb != NULL; \
383 tcp_tmp_pcb = tcp_tmp_pcb->next) { \
384 if(tcp_tmp_pcb->next == (npcb)) { \
385 tcp_tmp_pcb->next = (npcb)->next; \
386 break; \
387 } \
388 } \
389 } \
390 (npcb)->next = NULL; \
391 } while(0)
392
393#endif /* LWIP_DEBUG */
394
395#define TCP_REG_ACTIVE(npcb) \
396 do { \
397 TCP_REG(&tcp_active_pcbs, npcb); \
398 tcp_active_pcbs_changed = 1; \
399 } while (0)
400
401#define TCP_RMV_ACTIVE(npcb) \
402 do { \
403 TCP_RMV(&tcp_active_pcbs, npcb); \
404 tcp_active_pcbs_changed = 1; \
405 } while (0)
406
407#define TCP_PCB_REMOVE_ACTIVE(pcb) \
408 do { \
409 tcp_pcb_remove(&tcp_active_pcbs, pcb); \
410 tcp_active_pcbs_changed = 1; \
411 } while (0)
412
413
414/* Internal functions: */
415struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb);
416void tcp_pcb_purge(struct tcp_pcb *pcb);
417void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb);
418
419void tcp_segs_free(struct tcp_seg *seg);
420void tcp_seg_free(struct tcp_seg *seg);
421struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg);
422
423#define tcp_ack(pcb) \
424 do { \
425 if((pcb)->flags & TF_ACK_DELAY) { \
426 (pcb)->flags &= ~TF_ACK_DELAY; \
427 (pcb)->flags |= TF_ACK_NOW; \
428 } \
429 else { \
430 (pcb)->flags |= TF_ACK_DELAY; \
431 } \
432 } while (0)
433
434#define tcp_ack_now(pcb) \
435 do { \
436 (pcb)->flags |= TF_ACK_NOW; \
437 } while (0)
438
439err_t tcp_send_fin(struct tcp_pcb *pcb);
440err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags);
441
442void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg);
443
444void tcp_rst(u32_t seqno, u32_t ackno,
445 ip_addr_t *local_ip, ip_addr_t *remote_ip,
446 u16_t local_port, u16_t remote_port);
447
448u32_t tcp_next_iss(void);
449
450void tcp_keepalive(struct tcp_pcb *pcb);
451void tcp_zero_window_probe(struct tcp_pcb *pcb);
452
453#if TCP_CALCULATE_EFF_SEND_MSS
454u16_t tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr);
455#endif /* TCP_CALCULATE_EFF_SEND_MSS */
456
457#if LWIP_CALLBACK_API
458err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
459#endif /* LWIP_CALLBACK_API */
460
461#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
462void tcp_debug_print(struct tcp_hdr *tcphdr);
463void tcp_debug_print_flags(u8_t flags);
464void tcp_debug_print_state(enum tcp_state s);
465void tcp_debug_print_pcbs(void);
466s16_t tcp_pcbs_sane(void);
467#else
468# define tcp_debug_print(tcphdr)
469# define tcp_debug_print_flags(flags)
470# define tcp_debug_print_state(s)
471# define tcp_debug_print_pcbs()
472# define tcp_pcbs_sane() 1
473#endif /* TCP_DEBUG */
474
475/** External function (implemented in timers.c), called when TCP detects
476 * that a timer is needed (i.e. active- or time-wait-pcb found). */
477void tcp_timer_needed(void);
478
479
480#ifdef __cplusplus
481}
482#endif
483
484#endif /* LWIP_TCP */
485
486#endif /* __LWIP_TCP_H__ */
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