The Pedigree Project 0.1
tcp_priv.h
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1/*
2 * Copyright (c) 2008-2014, Pedigree Developers
3 *
4 * Please see the CONTRIB file in the root of the source tree for a full
5 * list of contributors.
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
25/*
26 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
27 * All rights reserved.
28 *
29 * Redistribution and use in source and binary forms, with or without modification,
30 * are permitted provided that the following conditions are met:
31 *
32 * 1. Redistributions of source code must retain the above copyright notice,
33 * this list of conditions and the following disclaimer.
34 * 2. Redistributions in binary form must reproduce the above copyright notice,
35 * this list of conditions and the following disclaimer in the documentation
36 * and/or other materials provided with the distribution.
37 * 3. The name of the author may not be used to endorse or promote products
38 * derived from this software without specific prior written permission.
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
41 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
42 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
43 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
44 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
45 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
46 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
47 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
48 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
49 * OF SUCH DAMAGE.
50 *
51 * This file is part of the lwIP TCP/IP stack.
52 *
53 * Author: Adam Dunkels <adam@sics.se>
54 *
55 */
56#ifndef LWIP_HDR_TCP_PRIV_H
57#define LWIP_HDR_TCP_PRIV_H
58
59#include "lwip/opt.h"
60
61#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
62
63#include "lwip/tcp.h"
64#include "lwip/mem.h"
65#include "lwip/pbuf.h"
66#include "lwip/ip.h"
67#include "lwip/icmp.h"
68#include "lwip/err.h"
69#include "lwip/ip6.h"
70#include "lwip/ip6_addr.h"
71#include "lwip/prot/tcp.h"
72
73#ifdef __cplusplus
74extern "C" {
75#endif
76
77/* Functions for interfacing with TCP: */
78
79/* Lower layer interface to TCP: */
80void tcp_init (void); /* Initialize this module. */
81void tcp_tmr (void); /* Must be called every
82 TCP_TMR_INTERVAL
83 ms. (Typically 250 ms). */
84/* It is also possible to call these two functions at the right
85 intervals (instead of calling tcp_tmr()). */
86void tcp_slowtmr (void);
87void tcp_fasttmr (void);
88
89/* Call this from a netif driver (watch out for threading issues!) that has
90 returned a memory error on transmit and now has free buffers to send more.
91 This iterates all active pcbs that had an error and tries to call
92 tcp_output, so use this with care as it might slow down the system. */
93void tcp_txnow (void);
94
95/* Only used by IP to pass a TCP segment to TCP: */
96void tcp_input (struct pbuf *p, struct netif *inp);
97/* Used within the TCP code only: */
98struct tcp_pcb * tcp_alloc (u8_t prio);
99void tcp_abandon (struct tcp_pcb *pcb, int reset);
100err_t tcp_send_empty_ack(struct tcp_pcb *pcb);
101void tcp_rexmit (struct tcp_pcb *pcb);
102void tcp_rexmit_rto (struct tcp_pcb *pcb);
103void tcp_rexmit_fast (struct tcp_pcb *pcb);
104u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb);
105err_t tcp_process_refused_data(struct tcp_pcb *pcb);
106
116#define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \
117 ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \
118 (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \
119 ((tpcb)->unsent->len >= (tpcb)->mss))) || \
120 ((tcp_sndbuf(tpcb) == 0) || (tcp_sndqueuelen(tpcb) >= TCP_SND_QUEUELEN)) \
121 ) ? 1 : 0)
122#define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)
123
124
125#define TCP_SEQ_LT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) < 0)
126#define TCP_SEQ_LEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) <= 0)
127#define TCP_SEQ_GT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) > 0)
128#define TCP_SEQ_GEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) >= 0)
129/* is b<=a<=c? */
130#if 0 /* see bug #10548 */
131#define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
132#endif
133#define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
134
135#ifndef TCP_TMR_INTERVAL
136#define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */
137#endif /* TCP_TMR_INTERVAL */
138
139#ifndef TCP_FAST_INTERVAL
140#define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */
141#endif /* TCP_FAST_INTERVAL */
142
143#ifndef TCP_SLOW_INTERVAL
144#define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */
145#endif /* TCP_SLOW_INTERVAL */
146
147#define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
148#define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */
149
150#define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
151
152#ifndef TCP_MSL
153#define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */
154#endif
155
156/* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */
157#ifndef TCP_KEEPIDLE_DEFAULT
158#define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */
159#endif
160
161#ifndef TCP_KEEPINTVL_DEFAULT
162#define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */
163#endif
164
165#ifndef TCP_KEEPCNT_DEFAULT
166#define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */
167#endif
168
169#define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */
170
171#define TCP_TCPLEN(seg) ((seg)->len + (((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0) ? 1U : 0U))
172
175#define TF_RESET (u8_t)0x08U /* Connection was reset. */
176#define TF_CLOSED (u8_t)0x10U /* Connection was successfully closed. */
177#define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */
178
179
180#if LWIP_EVENT_API
181
182#define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) ret = lwip_tcp_event(arg, (pcb),\
183 LWIP_EVENT_ACCEPT, NULL, 0, err)
184#define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
185 LWIP_EVENT_SENT, NULL, space, ERR_OK)
186#define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
187 LWIP_EVENT_RECV, (p), 0, (err))
188#define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
189 LWIP_EVENT_RECV, NULL, 0, ERR_OK)
190#define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
191 LWIP_EVENT_CONNECTED, NULL, 0, (err))
192#define TCP_EVENT_POLL(pcb,ret) do { if ((pcb)->state != SYN_RCVD) { \
193 ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_POLL, NULL, 0, ERR_OK); \
194 } else { \
195 ret = ERR_ARG; } } while(0)
196#define TCP_EVENT_ERR(last_state,errf,arg,err) do { if (last_state != SYN_RCVD) { \
197 lwip_tcp_event((arg), NULL, LWIP_EVENT_ERR, NULL, 0, (err)); } } while(0)
198
199#else /* LWIP_EVENT_API */
200
201#define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) \
202 do { \
203 if((lpcb)->accept != NULL) \
204 (ret) = (lpcb)->accept((arg),(pcb),(err)); \
205 else (ret) = ERR_ARG; \
206 } while (0)
207
208#define TCP_EVENT_SENT(pcb,space,ret) \
209 do { \
210 if((pcb)->sent != NULL) \
211 (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \
212 else (ret) = ERR_OK; \
213 } while (0)
214
215#define TCP_EVENT_RECV(pcb,p,err,ret) \
216 do { \
217 if((pcb)->recv != NULL) { \
218 (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\
219 } else { \
220 (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \
221 } \
222 } while (0)
223
224#define TCP_EVENT_CLOSED(pcb,ret) \
225 do { \
226 if(((pcb)->recv != NULL)) { \
227 (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\
228 } else { \
229 (ret) = ERR_OK; \
230 } \
231 } while (0)
232
233#define TCP_EVENT_CONNECTED(pcb,err,ret) \
234 do { \
235 if((pcb)->connected != NULL) \
236 (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \
237 else (ret) = ERR_OK; \
238 } while (0)
239
240#define TCP_EVENT_POLL(pcb,ret) \
241 do { \
242 if((pcb)->poll != NULL) \
243 (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \
244 else (ret) = ERR_OK; \
245 } while (0)
246
247#define TCP_EVENT_ERR(last_state,errf,arg,err) \
248 do { \
249 LWIP_UNUSED_ARG(last_state); \
250 if((errf) != NULL) \
251 (errf)((arg),(err)); \
252 } while (0)
253
254#endif /* LWIP_EVENT_API */
255
257#if TCP_OVERSIZE && defined(LWIP_DEBUG)
258#define TCP_OVERSIZE_DBGCHECK 1
259#else
260#define TCP_OVERSIZE_DBGCHECK 0
261#endif
262
264#define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP)
265
266/* This structure represents a TCP segment on the unsent, unacked and ooseq queues */
267struct tcp_seg {
268 struct tcp_seg *next; /* used when putting segments on a queue */
269 struct pbuf *p; /* buffer containing data + TCP header */
270 u16_t len; /* the TCP length of this segment */
271#if TCP_OVERSIZE_DBGCHECK
272 u16_t oversize_left; /* Extra bytes available at the end of the last
273 pbuf in unsent (used for asserting vs.
274 tcp_pcb.unsent_oversize only) */
275#endif /* TCP_OVERSIZE_DBGCHECK */
276#if TCP_CHECKSUM_ON_COPY
277 u16_t chksum;
278 u8_t chksum_swapped;
279#endif /* TCP_CHECKSUM_ON_COPY */
280 u8_t flags;
281#define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option. */
282#define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */
283#define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is
284 checksummed into 'chksum' */
285#define TF_SEG_OPTS_WND_SCALE (u8_t)0x08U /* Include WND SCALE option */
286 struct tcp_hdr *tcphdr; /* the TCP header */
287};
288
289#define LWIP_TCP_OPT_EOL 0
290#define LWIP_TCP_OPT_NOP 1
291#define LWIP_TCP_OPT_MSS 2
292#define LWIP_TCP_OPT_WS 3
293#define LWIP_TCP_OPT_TS 8
294
295#define LWIP_TCP_OPT_LEN_MSS 4
296#if LWIP_TCP_TIMESTAMPS
297#define LWIP_TCP_OPT_LEN_TS 10
298#define LWIP_TCP_OPT_LEN_TS_OUT 12 /* aligned for output (includes NOP padding) */
299#else
300#define LWIP_TCP_OPT_LEN_TS_OUT 0
301#endif
302#if LWIP_WND_SCALE
303#define LWIP_TCP_OPT_LEN_WS 3
304#define LWIP_TCP_OPT_LEN_WS_OUT 4 /* aligned for output (includes NOP padding) */
305#else
306#define LWIP_TCP_OPT_LEN_WS_OUT 0
307#endif
308
309#define LWIP_TCP_OPT_LENGTH(flags) \
310 (flags & TF_SEG_OPTS_MSS ? LWIP_TCP_OPT_LEN_MSS : 0) + \
311 (flags & TF_SEG_OPTS_TS ? LWIP_TCP_OPT_LEN_TS_OUT : 0) + \
312 (flags & TF_SEG_OPTS_WND_SCALE ? LWIP_TCP_OPT_LEN_WS_OUT : 0)
313
315#define TCP_BUILD_MSS_OPTION(mss) lwip_htonl(0x02040000 | ((mss) & 0xFFFF))
316
317#if LWIP_WND_SCALE
318#define TCPWNDSIZE_F U32_F
319#define TCPWND_MAX 0xFFFFFFFFU
320#define TCPWND_CHECK16(x) LWIP_ASSERT("window size > 0xFFFF", (x) <= 0xFFFF)
321#define TCPWND_MIN16(x) ((u16_t)LWIP_MIN((x), 0xFFFF))
322#else /* LWIP_WND_SCALE */
323#define TCPWNDSIZE_F U16_F
324#define TCPWND_MAX 0xFFFFU
325#define TCPWND_CHECK16(x)
326#define TCPWND_MIN16(x) x
327#endif /* LWIP_WND_SCALE */
328
329/* Global variables: */
330extern struct tcp_pcb *tcp_input_pcb;
331extern u32_t tcp_ticks;
332extern u8_t tcp_active_pcbs_changed;
333
334/* The TCP PCB lists. */
335union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */
336 struct tcp_pcb_listen *listen_pcbs;
337 struct tcp_pcb *pcbs;
338};
339extern struct tcp_pcb *tcp_bound_pcbs;
340extern union tcp_listen_pcbs_t tcp_listen_pcbs;
341extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a
342 state in which they accept or send
343 data. */
344extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */
345
346#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
347#define NUM_TCP_PCB_LISTS 4
348extern struct tcp_pcb ** const tcp_pcb_lists[NUM_TCP_PCB_LISTS];
349
350/* Axioms about the above lists:
351 1) Every TCP PCB that is not CLOSED is in one of the lists.
352 2) A PCB is only in one of the lists.
353 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
354 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
355*/
356/* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
357 with a PCB list or removes a PCB from a list, respectively. */
358#ifndef TCP_DEBUG_PCB_LISTS
359#define TCP_DEBUG_PCB_LISTS 0
360#endif
361#if TCP_DEBUG_PCB_LISTS
362#define TCP_REG(pcbs, npcb) do {\
363 struct tcp_pcb *tcp_tmp_pcb; \
364 LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", (npcb), (npcb)->local_port)); \
365 for (tcp_tmp_pcb = *(pcbs); \
366 tcp_tmp_pcb != NULL; \
367 tcp_tmp_pcb = tcp_tmp_pcb->next) { \
368 LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \
369 } \
370 LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \
371 (npcb)->next = *(pcbs); \
372 LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \
373 *(pcbs) = (npcb); \
374 LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
375 tcp_timer_needed(); \
376 } while(0)
377#define TCP_RMV(pcbs, npcb) do { \
378 struct tcp_pcb *tcp_tmp_pcb; \
379 LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \
380 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (npcb), *(pcbs))); \
381 if(*(pcbs) == (npcb)) { \
382 *(pcbs) = (*pcbs)->next; \
383 } else for (tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; 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 (npcb)->next = NULL; \
390 LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
391 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (npcb), *(pcbs))); \
392 } while(0)
393
394#else /* LWIP_DEBUG */
395
396#define TCP_REG(pcbs, npcb) \
397 do { \
398 (npcb)->next = *pcbs; \
399 *(pcbs) = (npcb); \
400 tcp_timer_needed(); \
401 } while (0)
402
403#define TCP_RMV(pcbs, npcb) \
404 do { \
405 if(*(pcbs) == (npcb)) { \
406 (*(pcbs)) = (*pcbs)->next; \
407 } \
408 else { \
409 struct tcp_pcb *tcp_tmp_pcb; \
410 for (tcp_tmp_pcb = *pcbs; \
411 tcp_tmp_pcb != NULL; \
412 tcp_tmp_pcb = tcp_tmp_pcb->next) { \
413 if(tcp_tmp_pcb->next == (npcb)) { \
414 tcp_tmp_pcb->next = (npcb)->next; \
415 break; \
416 } \
417 } \
418 } \
419 (npcb)->next = NULL; \
420 } while(0)
421
422#endif /* LWIP_DEBUG */
423
424#define TCP_REG_ACTIVE(npcb) \
425 do { \
426 TCP_REG(&tcp_active_pcbs, npcb); \
427 tcp_active_pcbs_changed = 1; \
428 } while (0)
429
430#define TCP_RMV_ACTIVE(npcb) \
431 do { \
432 TCP_RMV(&tcp_active_pcbs, npcb); \
433 tcp_active_pcbs_changed = 1; \
434 } while (0)
435
436#define TCP_PCB_REMOVE_ACTIVE(pcb) \
437 do { \
438 tcp_pcb_remove(&tcp_active_pcbs, pcb); \
439 tcp_active_pcbs_changed = 1; \
440 } while (0)
441
442
443/* Internal functions: */
444struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb);
445void tcp_pcb_purge(struct tcp_pcb *pcb);
446void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb);
447
448void tcp_segs_free(struct tcp_seg *seg);
449void tcp_seg_free(struct tcp_seg *seg);
450struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg);
451
452#define tcp_ack(pcb) \
453 do { \
454 if((pcb)->flags & TF_ACK_DELAY) { \
455 (pcb)->flags &= ~TF_ACK_DELAY; \
456 (pcb)->flags |= TF_ACK_NOW; \
457 } \
458 else { \
459 (pcb)->flags |= TF_ACK_DELAY; \
460 } \
461 } while (0)
462
463#define tcp_ack_now(pcb) \
464 do { \
465 (pcb)->flags |= TF_ACK_NOW; \
466 } while (0)
467
468err_t tcp_send_fin(struct tcp_pcb *pcb);
469err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags);
470
471void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg);
472
473void tcp_rst(u32_t seqno, u32_t ackno,
474 const ip_addr_t *local_ip, const ip_addr_t *remote_ip,
475 u16_t local_port, u16_t remote_port);
476
477u32_t tcp_next_iss(struct tcp_pcb *pcb);
478
479err_t tcp_keepalive(struct tcp_pcb *pcb);
480err_t tcp_zero_window_probe(struct tcp_pcb *pcb);
481void tcp_trigger_input_pcb_close(void);
482
483#if TCP_CALCULATE_EFF_SEND_MSS
484u16_t tcp_eff_send_mss_impl(u16_t sendmss, const ip_addr_t *dest
485#if LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING
486 , const ip_addr_t *src
487#endif /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */
488 );
489#if LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING
490#define tcp_eff_send_mss(sendmss, src, dest) tcp_eff_send_mss_impl(sendmss, dest, src)
491#else /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */
492#define tcp_eff_send_mss(sendmss, src, dest) tcp_eff_send_mss_impl(sendmss, dest)
493#endif /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */
494#endif /* TCP_CALCULATE_EFF_SEND_MSS */
495
496#if LWIP_CALLBACK_API
497err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
498#endif /* LWIP_CALLBACK_API */
499
500#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
501void tcp_debug_print(struct tcp_hdr *tcphdr);
502void tcp_debug_print_flags(u8_t flags);
503void tcp_debug_print_state(enum tcp_state s);
504void tcp_debug_print_pcbs(void);
505s16_t tcp_pcbs_sane(void);
506#else
507# define tcp_debug_print(tcphdr)
508# define tcp_debug_print_flags(flags)
509# define tcp_debug_print_state(s)
510# define tcp_debug_print_pcbs()
511# define tcp_pcbs_sane() 1
512#endif /* TCP_DEBUG */
513
516void tcp_timer_needed(void);
517
518void tcp_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_addr);
519
520#ifdef __cplusplus
521}
522#endif
523
524#endif /* LWIP_TCP */
525
526#endif /* LWIP_HDR_TCP_PRIV_H */
err_t
s8_t err_t
Definition err.h:76
ip6_addr.h
netif
Definition netif.h:244
pbuf
Definition pbuf.h:161
tcp_hdr
Definition prot/tcp.h:75
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