source: azure_iot_hub_f767zi/trunk/asp_baseplatform/lwip/lwip-2.1.2/src/include/lwip/priv/tcp_priv.h@ 457

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1/**
2 * @file
3 * TCP internal implementations (do not use in application code)
4 */
5
6/*
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
12 *
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.
20 *
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
30 * OF SUCH DAMAGE.
31 *
32 * This file is part of the lwIP TCP/IP stack.
33 *
34 * Author: Adam Dunkels <adam@sics.se>
35 *
36 */
37#ifndef LWIP_HDR_TCP_PRIV_H
38#define LWIP_HDR_TCP_PRIV_H
39
40#include "lwip/opt.h"
41
42#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
43
44#include "lwip/tcp.h"
45#include "lwip/mem.h"
46#include "lwip/pbuf.h"
47#include "lwip/ip.h"
48#include "lwip/icmp.h"
49#include "lwip/err.h"
50#include "lwip/ip6.h"
51#include "lwip/ip6_addr.h"
52#include "lwip/prot/tcp.h"
53
54#ifdef __cplusplus
55extern "C" {
56#endif
57
58/* Functions for interfacing with TCP: */
59
60/* Lower layer interface to TCP: */
61void tcp_init (void); /* Initialize this module. */
62void tcp_tmr (void); /* Must be called every
63 TCP_TMR_INTERVAL
64 ms. (Typically 250 ms). */
65/* It is also possible to call these two functions at the right
66 intervals (instead of calling tcp_tmr()). */
67void tcp_slowtmr (void);
68void tcp_fasttmr (void);
69
70/* Call this from a netif driver (watch out for threading issues!) that has
71 returned a memory error on transmit and now has free buffers to send more.
72 This iterates all active pcbs that had an error and tries to call
73 tcp_output, so use this with care as it might slow down the system. */
74void tcp_txnow (void);
75
76/* Only used by IP to pass a TCP segment to TCP: */
77void tcp_input (struct pbuf *p, struct netif *inp);
78/* Used within the TCP code only: */
79struct tcp_pcb * tcp_alloc (u8_t prio);
80void tcp_free (struct tcp_pcb *pcb);
81void tcp_abandon (struct tcp_pcb *pcb, int reset);
82err_t tcp_send_empty_ack(struct tcp_pcb *pcb);
83err_t tcp_rexmit (struct tcp_pcb *pcb);
84err_t tcp_rexmit_rto_prepare(struct tcp_pcb *pcb);
85void tcp_rexmit_rto_commit(struct tcp_pcb *pcb);
86void tcp_rexmit_rto (struct tcp_pcb *pcb);
87void tcp_rexmit_fast (struct tcp_pcb *pcb);
88u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb);
89err_t tcp_process_refused_data(struct tcp_pcb *pcb);
90
91/**
92 * This is the Nagle algorithm: try to combine user data to send as few TCP
93 * segments as possible. Only send if
94 * - no previously transmitted data on the connection remains unacknowledged or
95 * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or
96 * - the only unsent segment is at least pcb->mss bytes long (or there is more
97 * than one unsent segment - with lwIP, this can happen although unsent->len < mss)
98 * - or if we are in fast-retransmit (TF_INFR)
99 */
100#define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \
101 ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \
102 (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \
103 ((tpcb)->unsent->len >= (tpcb)->mss))) || \
104 ((tcp_sndbuf(tpcb) == 0) || (tcp_sndqueuelen(tpcb) >= TCP_SND_QUEUELEN)) \
105 ) ? 1 : 0)
106#define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)
107
108
109#define TCP_SEQ_LT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) < 0)
110#define TCP_SEQ_LEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) <= 0)
111#define TCP_SEQ_GT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) > 0)
112#define TCP_SEQ_GEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) >= 0)
113/* is b<=a<=c? */
114#if 0 /* see bug #10548 */
115#define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
116#endif
117#define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
118
119#ifndef TCP_TMR_INTERVAL
120#define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */
121#endif /* TCP_TMR_INTERVAL */
122
123#ifndef TCP_FAST_INTERVAL
124#define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */
125#endif /* TCP_FAST_INTERVAL */
126
127#ifndef TCP_SLOW_INTERVAL
128#define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */
129#endif /* TCP_SLOW_INTERVAL */
130
131#define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
132#define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */
133
134#define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
135
136#ifndef TCP_MSL
137#define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */
138#endif
139
140/* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */
141#ifndef TCP_KEEPIDLE_DEFAULT
142#define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */
143#endif
144
145#ifndef TCP_KEEPINTVL_DEFAULT
146#define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */
147#endif
148
149#ifndef TCP_KEEPCNT_DEFAULT
150#define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */
151#endif
152
153#define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */
154
155#define TCP_TCPLEN(seg) ((seg)->len + (((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0) ? 1U : 0U))
156
157/** Flags used on input processing, not on pcb->flags
158*/
159#define TF_RESET (u8_t)0x08U /* Connection was reset. */
160#define TF_CLOSED (u8_t)0x10U /* Connection was successfully closed. */
161#define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */
162
163
164#if LWIP_EVENT_API
165
166#define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) ret = lwip_tcp_event(arg, (pcb),\
167 LWIP_EVENT_ACCEPT, NULL, 0, err)
168#define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
169 LWIP_EVENT_SENT, NULL, space, ERR_OK)
170#define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
171 LWIP_EVENT_RECV, (p), 0, (err))
172#define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
173 LWIP_EVENT_RECV, NULL, 0, ERR_OK)
174#define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
175 LWIP_EVENT_CONNECTED, NULL, 0, (err))
176#define TCP_EVENT_POLL(pcb,ret) do { if ((pcb)->state != SYN_RCVD) { \
177 ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_POLL, NULL, 0, ERR_OK); \
178 } else { \
179 ret = ERR_ARG; } } while(0)
180/* For event API, last state SYN_RCVD must be excluded here: the application
181 has not seen this pcb, yet! */
182#define TCP_EVENT_ERR(last_state,errf,arg,err) do { if (last_state != SYN_RCVD) { \
183 lwip_tcp_event((arg), NULL, LWIP_EVENT_ERR, NULL, 0, (err)); } } while(0)
184
185#else /* LWIP_EVENT_API */
186
187#define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) \
188 do { \
189 if((lpcb)->accept != NULL) \
190 (ret) = (lpcb)->accept((arg),(pcb),(err)); \
191 else (ret) = ERR_ARG; \
192 } while (0)
193
194#define TCP_EVENT_SENT(pcb,space,ret) \
195 do { \
196 if((pcb)->sent != NULL) \
197 (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \
198 else (ret) = ERR_OK; \
199 } while (0)
200
201#define TCP_EVENT_RECV(pcb,p,err,ret) \
202 do { \
203 if((pcb)->recv != NULL) { \
204 (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\
205 } else { \
206 (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \
207 } \
208 } while (0)
209
210#define TCP_EVENT_CLOSED(pcb,ret) \
211 do { \
212 if(((pcb)->recv != NULL)) { \
213 (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\
214 } else { \
215 (ret) = ERR_OK; \
216 } \
217 } while (0)
218
219#define TCP_EVENT_CONNECTED(pcb,err,ret) \
220 do { \
221 if((pcb)->connected != NULL) \
222 (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \
223 else (ret) = ERR_OK; \
224 } while (0)
225
226#define TCP_EVENT_POLL(pcb,ret) \
227 do { \
228 if((pcb)->poll != NULL) \
229 (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \
230 else (ret) = ERR_OK; \
231 } while (0)
232
233#define TCP_EVENT_ERR(last_state,errf,arg,err) \
234 do { \
235 LWIP_UNUSED_ARG(last_state); \
236 if((errf) != NULL) \
237 (errf)((arg),(err)); \
238 } while (0)
239
240#endif /* LWIP_EVENT_API */
241
242/** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */
243#if TCP_OVERSIZE && defined(LWIP_DEBUG)
244#define TCP_OVERSIZE_DBGCHECK 1
245#else
246#define TCP_OVERSIZE_DBGCHECK 0
247#endif
248
249/** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */
250#define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP)
251
252/* This structure represents a TCP segment on the unsent, unacked and ooseq queues */
253struct tcp_seg {
254 struct tcp_seg *next; /* used when putting segments on a queue */
255 struct pbuf *p; /* buffer containing data + TCP header */
256 u16_t len; /* the TCP length of this segment */
257#if TCP_OVERSIZE_DBGCHECK
258 u16_t oversize_left; /* Extra bytes available at the end of the last
259 pbuf in unsent (used for asserting vs.
260 tcp_pcb.unsent_oversize only) */
261#endif /* TCP_OVERSIZE_DBGCHECK */
262#if TCP_CHECKSUM_ON_COPY
263 u16_t chksum;
264 u8_t chksum_swapped;
265#endif /* TCP_CHECKSUM_ON_COPY */
266 u8_t flags;
267#define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option (only used in SYN segments) */
268#define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */
269#define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is
270 checksummed into 'chksum' */
271#define TF_SEG_OPTS_WND_SCALE (u8_t)0x08U /* Include WND SCALE option (only used in SYN segments) */
272#define TF_SEG_OPTS_SACK_PERM (u8_t)0x10U /* Include SACK Permitted option (only used in SYN segments) */
273 struct tcp_hdr *tcphdr; /* the TCP header */
274};
275
276#define LWIP_TCP_OPT_EOL 0
277#define LWIP_TCP_OPT_NOP 1
278#define LWIP_TCP_OPT_MSS 2
279#define LWIP_TCP_OPT_WS 3
280#define LWIP_TCP_OPT_SACK_PERM 4
281#define LWIP_TCP_OPT_TS 8
282
283#define LWIP_TCP_OPT_LEN_MSS 4
284#if LWIP_TCP_TIMESTAMPS
285#define LWIP_TCP_OPT_LEN_TS 10
286#define LWIP_TCP_OPT_LEN_TS_OUT 12 /* aligned for output (includes NOP padding) */
287#else
288#define LWIP_TCP_OPT_LEN_TS_OUT 0
289#endif
290#if LWIP_WND_SCALE
291#define LWIP_TCP_OPT_LEN_WS 3
292#define LWIP_TCP_OPT_LEN_WS_OUT 4 /* aligned for output (includes NOP padding) */
293#else
294#define LWIP_TCP_OPT_LEN_WS_OUT 0
295#endif
296
297#if LWIP_TCP_SACK_OUT
298#define LWIP_TCP_OPT_LEN_SACK_PERM 2
299#define LWIP_TCP_OPT_LEN_SACK_PERM_OUT 4 /* aligned for output (includes NOP padding) */
300#else
301#define LWIP_TCP_OPT_LEN_SACK_PERM_OUT 0
302#endif
303
304#define LWIP_TCP_OPT_LENGTH(flags) \
305 ((flags) & TF_SEG_OPTS_MSS ? LWIP_TCP_OPT_LEN_MSS : 0) + \
306 ((flags) & TF_SEG_OPTS_TS ? LWIP_TCP_OPT_LEN_TS_OUT : 0) + \
307 ((flags) & TF_SEG_OPTS_WND_SCALE ? LWIP_TCP_OPT_LEN_WS_OUT : 0) + \
308 ((flags) & TF_SEG_OPTS_SACK_PERM ? LWIP_TCP_OPT_LEN_SACK_PERM_OUT : 0)
309
310/** This returns a TCP header option for MSS in an u32_t */
311#define TCP_BUILD_MSS_OPTION(mss) lwip_htonl(0x02040000 | ((mss) & 0xFFFF))
312
313#if LWIP_WND_SCALE
314#define TCPWNDSIZE_F U32_F
315#define TCPWND_MAX 0xFFFFFFFFU
316#define TCPWND_CHECK16(x) LWIP_ASSERT("window size > 0xFFFF", (x) <= 0xFFFF)
317#define TCPWND_MIN16(x) ((u16_t)LWIP_MIN((x), 0xFFFF))
318#else /* LWIP_WND_SCALE */
319#define TCPWNDSIZE_F U16_F
320#define TCPWND_MAX 0xFFFFU
321#define TCPWND_CHECK16(x)
322#define TCPWND_MIN16(x) x
323#endif /* LWIP_WND_SCALE */
324
325/* Global variables: */
326extern struct tcp_pcb *tcp_input_pcb;
327extern u32_t tcp_ticks;
328extern u8_t tcp_active_pcbs_changed;
329
330/* The TCP PCB lists. */
331union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */
332 struct tcp_pcb_listen *listen_pcbs;
333 struct tcp_pcb *pcbs;
334};
335extern struct tcp_pcb *tcp_bound_pcbs;
336extern union tcp_listen_pcbs_t tcp_listen_pcbs;
337extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a
338 state in which they accept or send
339 data. */
340extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */
341
342#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
343#define NUM_TCP_PCB_LISTS 4
344extern struct tcp_pcb ** const tcp_pcb_lists[NUM_TCP_PCB_LISTS];
345
346/* Axioms about the above lists:
347 1) Every TCP PCB that is not CLOSED is in one of the lists.
348 2) A PCB is only in one of the lists.
349 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
350 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
351*/
352/* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
353 with a PCB list or removes a PCB from a list, respectively. */
354#ifndef TCP_DEBUG_PCB_LISTS
355#define TCP_DEBUG_PCB_LISTS 0
356#endif
357#if TCP_DEBUG_PCB_LISTS
358#define TCP_REG(pcbs, npcb) do {\
359 struct tcp_pcb *tcp_tmp_pcb; \
360 LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %"U16_F"\n", (void *)(npcb), (npcb)->local_port)); \
361 for (tcp_tmp_pcb = *(pcbs); \
362 tcp_tmp_pcb != NULL; \
363 tcp_tmp_pcb = tcp_tmp_pcb->next) { \
364 LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \
365 } \
366 LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \
367 (npcb)->next = *(pcbs); \
368 LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \
369 *(pcbs) = (npcb); \
370 LWIP_ASSERT("TCP_REG: tcp_pcbs sane", tcp_pcbs_sane()); \
371 tcp_timer_needed(); \
372 } while(0)
373#define TCP_RMV(pcbs, npcb) do { \
374 struct tcp_pcb *tcp_tmp_pcb; \
375 LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \
376 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (void *)(npcb), (void *)(*(pcbs)))); \
377 if(*(pcbs) == (npcb)) { \
378 *(pcbs) = (*pcbs)->next; \
379 } else for (tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
380 if(tcp_tmp_pcb->next == (npcb)) { \
381 tcp_tmp_pcb->next = (npcb)->next; \
382 break; \
383 } \
384 } \
385 (npcb)->next = NULL; \
386 LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
387 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (void *)(npcb), (void *)(*(pcbs)))); \
388 } while(0)
389
390#else /* LWIP_DEBUG */
391
392#define TCP_REG(pcbs, npcb) \
393 do { \
394 (npcb)->next = *pcbs; \
395 *(pcbs) = (npcb); \
396 tcp_timer_needed(); \
397 } while (0)
398
399#define TCP_RMV(pcbs, npcb) \
400 do { \
401 if(*(pcbs) == (npcb)) { \
402 (*(pcbs)) = (*pcbs)->next; \
403 } \
404 else { \
405 struct tcp_pcb *tcp_tmp_pcb; \
406 for (tcp_tmp_pcb = *pcbs; \
407 tcp_tmp_pcb != NULL; \
408 tcp_tmp_pcb = tcp_tmp_pcb->next) { \
409 if(tcp_tmp_pcb->next == (npcb)) { \
410 tcp_tmp_pcb->next = (npcb)->next; \
411 break; \
412 } \
413 } \
414 } \
415 (npcb)->next = NULL; \
416 } while(0)
417
418#endif /* LWIP_DEBUG */
419
420#define TCP_REG_ACTIVE(npcb) \
421 do { \
422 TCP_REG(&tcp_active_pcbs, npcb); \
423 tcp_active_pcbs_changed = 1; \
424 } while (0)
425
426#define TCP_RMV_ACTIVE(npcb) \
427 do { \
428 TCP_RMV(&tcp_active_pcbs, npcb); \
429 tcp_active_pcbs_changed = 1; \
430 } while (0)
431
432#define TCP_PCB_REMOVE_ACTIVE(pcb) \
433 do { \
434 tcp_pcb_remove(&tcp_active_pcbs, pcb); \
435 tcp_active_pcbs_changed = 1; \
436 } while (0)
437
438
439/* Internal functions: */
440struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb);
441void tcp_pcb_purge(struct tcp_pcb *pcb);
442void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb);
443
444void tcp_segs_free(struct tcp_seg *seg);
445void tcp_seg_free(struct tcp_seg *seg);
446struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg);
447
448#define tcp_ack(pcb) \
449 do { \
450 if((pcb)->flags & TF_ACK_DELAY) { \
451 tcp_clear_flags(pcb, TF_ACK_DELAY); \
452 tcp_ack_now(pcb); \
453 } \
454 else { \
455 tcp_set_flags(pcb, TF_ACK_DELAY); \
456 } \
457 } while (0)
458
459#define tcp_ack_now(pcb) \
460 tcp_set_flags(pcb, TF_ACK_NOW)
461
462err_t tcp_send_fin(struct tcp_pcb *pcb);
463err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags);
464
465void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg);
466
467void tcp_rst(const struct tcp_pcb* pcb, u32_t seqno, u32_t ackno,
468 const ip_addr_t *local_ip, const ip_addr_t *remote_ip,
469 u16_t local_port, u16_t remote_port);
470
471u32_t tcp_next_iss(struct tcp_pcb *pcb);
472
473err_t tcp_keepalive(struct tcp_pcb *pcb);
474err_t tcp_split_unsent_seg(struct tcp_pcb *pcb, u16_t split);
475err_t tcp_zero_window_probe(struct tcp_pcb *pcb);
476void tcp_trigger_input_pcb_close(void);
477
478#if TCP_CALCULATE_EFF_SEND_MSS
479u16_t tcp_eff_send_mss_netif(u16_t sendmss, struct netif *outif,
480 const ip_addr_t *dest);
481#define tcp_eff_send_mss(sendmss, src, dest) \
482 tcp_eff_send_mss_netif(sendmss, ip_route(src, dest), dest)
483#endif /* TCP_CALCULATE_EFF_SEND_MSS */
484
485#if LWIP_CALLBACK_API
486err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
487#endif /* LWIP_CALLBACK_API */
488
489#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
490void tcp_debug_print(struct tcp_hdr *tcphdr);
491void tcp_debug_print_flags(u8_t flags);
492void tcp_debug_print_state(enum tcp_state s);
493void tcp_debug_print_pcbs(void);
494s16_t tcp_pcbs_sane(void);
495#else
496# define tcp_debug_print(tcphdr)
497# define tcp_debug_print_flags(flags)
498# define tcp_debug_print_state(s)
499# define tcp_debug_print_pcbs()
500# define tcp_pcbs_sane() 1
501#endif /* TCP_DEBUG */
502
503/** External function (implemented in timers.c), called when TCP detects
504 * that a timer is needed (i.e. active- or time-wait-pcb found). */
505void tcp_timer_needed(void);
506
507void tcp_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_addr);
508
509#if TCP_QUEUE_OOSEQ
510void tcp_free_ooseq(struct tcp_pcb *pcb);
511#endif
512
513#if LWIP_TCP_PCB_NUM_EXT_ARGS
514err_t tcp_ext_arg_invoke_callbacks_passive_open(struct tcp_pcb_listen *lpcb, struct tcp_pcb *cpcb);
515#endif
516
517#ifdef __cplusplus
518}
519#endif
520
521#endif /* LWIP_TCP */
522
523#endif /* LWIP_HDR_TCP_PRIV_H */
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