3 * Transmission Control Protocol for IP
5 * This file contains common functions for the TCP implementation, such as functinos
6 * for manipulating the data structures and the TCP timer functions. TCP functions
7 * related to input and output is found in tcp_in.c and tcp_out.c respectively.
12 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
13 * All rights reserved.
15 * Redistribution and use in source and binary forms, with or without modification,
16 * are permitted provided that the following conditions are met:
18 * 1. Redistributions of source code must retain the above copyright notice,
19 * this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright notice,
21 * this list of conditions and the following disclaimer in the documentation
22 * and/or other materials provided with the distribution.
23 * 3. The name of the author may not be used to endorse or promote products
24 * derived from this software without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
29 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
31 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
37 * This file is part of the lwIP TCP/IP stack.
39 * Author: Adam Dunkels <adam@sics.se>
45 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
49 #include "lwip/memp.h"
50 #include "lwip/snmp.h"
55 /* Incremented every coarse grained timer shot (typically every 500 ms). */
57 const u8_t tcp_backoff
[13] =
58 { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
59 /* Times per slowtmr hits */
60 const u8_t tcp_persist_backoff
[7] = { 3, 6, 12, 24, 48, 96, 120 };
62 /* The TCP PCB lists. */
64 /** List of all TCP PCBs bound but not yet (connected || listening) */
65 struct tcp_pcb
*tcp_bound_pcbs
;
66 /** List of all TCP PCBs in LISTEN state */
67 union tcp_listen_pcbs_t tcp_listen_pcbs
;
68 /** List of all TCP PCBs that are in a state in which
69 * they accept or send data. */
70 struct tcp_pcb
*tcp_active_pcbs
;
71 /** List of all TCP PCBs in TIME-WAIT state */
72 struct tcp_pcb
*tcp_tw_pcbs
;
74 struct tcp_pcb
*tcp_tmp_pcb
;
76 static u8_t tcp_timer
;
77 static u16_t
tcp_new_port(void);
80 * Called periodically to dispatch TCP timers.
86 /* Call tcp_fasttmr() every 250 ms */
89 if (++tcp_timer
& 1) {
90 /* Call tcp_tmr() every 500 ms, i.e., every other timer
91 tcp_tmr() is called. */
97 * Closes the connection held by the PCB.
99 * Listening pcbs are freed and may not be referenced any more.
100 * Connection pcbs are freed if not yet connected and may not be referenced
101 * any more. If a connection is established (at least SYN received or in
102 * a closing state), the connection is closed, and put in a closing state.
103 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
104 * unsafe to reference it.
106 * @param pcb the tcp_pcb to close
107 * @return ERR_OK if connection has been closed
108 * another err_t if closing failed and pcb is not freed
111 tcp_close(struct tcp_pcb
*pcb
)
116 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_close: closing in "));
117 tcp_debug_print_state(pcb
->state
);
118 #endif /* TCP_DEBUG */
120 switch (pcb
->state
) {
122 /* Closing a pcb in the CLOSED state might seem erroneous,
123 * however, it is in this state once allocated and as yet unused
124 * and the user needs some way to free it should the need arise.
125 * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
126 * or for a pcb that has been used and then entered the CLOSED state
127 * is erroneous, but this should never happen as the pcb has in those cases
128 * been freed, and so any remaining handles are bogus. */
130 TCP_RMV(&tcp_bound_pcbs
, pcb
);
131 memp_free(MEMP_TCP_PCB
, pcb
);
136 tcp_pcb_remove((struct tcp_pcb
**)&tcp_listen_pcbs
.pcbs
, pcb
);
137 memp_free(MEMP_TCP_PCB_LISTEN
, pcb
);
142 tcp_pcb_remove(&tcp_active_pcbs
, pcb
);
143 memp_free(MEMP_TCP_PCB
, pcb
);
145 snmp_inc_tcpattemptfails();
148 err
= tcp_send_ctrl(pcb
, TCP_FIN
);
150 snmp_inc_tcpattemptfails();
151 pcb
->state
= FIN_WAIT_1
;
155 err
= tcp_send_ctrl(pcb
, TCP_FIN
);
157 snmp_inc_tcpestabresets();
158 pcb
->state
= FIN_WAIT_1
;
162 err
= tcp_send_ctrl(pcb
, TCP_FIN
);
164 snmp_inc_tcpestabresets();
165 pcb
->state
= LAST_ACK
;
169 /* Has already been closed, do nothing. */
175 if (pcb
!= NULL
&& err
== ERR_OK
) {
176 /* To ensure all data has been sent when tcp_close returns, we have
177 to make sure tcp_output doesn't fail.
178 Since we don't really have to ensure all data has been sent when tcp_close
179 returns (unsent data is sent from tcp timer functions, also), we don't care
180 for the return value of tcp_output for now. */
181 /* @todo: When implementing SO_LINGER, this must be changed somehow:
182 If SOF_LINGER is set, the data should be sent when tcp_close returns. */
189 * Aborts a connection by sending a RST to the remote host and deletes
190 * the local protocol control block. This is done when a connection is
191 * killed because of shortage of memory.
193 * @param pcb the tcp_pcb to abort
196 tcp_abort(struct tcp_pcb
*pcb
)
199 u16_t remote_port
, local_port
;
200 struct ip_addr remote_ip
, local_ip
;
201 #if LWIP_CALLBACK_API
202 void (* errf
)(void *arg
, err_t err
);
203 #endif /* LWIP_CALLBACK_API */
207 /* Figure out on which TCP PCB list we are, and remove us. If we
208 are in an active state, call the receive function associated with
209 the PCB with a NULL argument, and send an RST to the remote end. */
210 if (pcb
->state
== TIME_WAIT
) {
211 tcp_pcb_remove(&tcp_tw_pcbs
, pcb
);
212 memp_free(MEMP_TCP_PCB
, pcb
);
214 seqno
= pcb
->snd_nxt
;
215 ackno
= pcb
->rcv_nxt
;
216 ip_addr_set(&local_ip
, &(pcb
->local_ip
));
217 ip_addr_set(&remote_ip
, &(pcb
->remote_ip
));
218 local_port
= pcb
->local_port
;
219 remote_port
= pcb
->remote_port
;
220 #if LWIP_CALLBACK_API
222 #endif /* LWIP_CALLBACK_API */
223 errf_arg
= pcb
->callback_arg
;
224 tcp_pcb_remove(&tcp_active_pcbs
, pcb
);
225 if (pcb
->unacked
!= NULL
) {
226 tcp_segs_free(pcb
->unacked
);
228 if (pcb
->unsent
!= NULL
) {
229 tcp_segs_free(pcb
->unsent
);
232 if (pcb
->ooseq
!= NULL
) {
233 tcp_segs_free(pcb
->ooseq
);
235 #endif /* TCP_QUEUE_OOSEQ */
236 memp_free(MEMP_TCP_PCB
, pcb
);
237 TCP_EVENT_ERR(errf
, errf_arg
, ERR_ABRT
);
238 LWIP_DEBUGF(TCP_RST_DEBUG
, ("tcp_abort: sending RST\n"));
239 tcp_rst(seqno
, ackno
, &local_ip
, &remote_ip
, local_port
, remote_port
);
244 * Binds the connection to a local portnumber and IP address. If the
245 * IP address is not given (i.e., ipaddr == NULL), the IP address of
246 * the outgoing network interface is used instead.
248 * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
250 * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
251 * to any local address
252 * @param port the local port to bind to
253 * @return ERR_USE if the port is already in use
257 tcp_bind(struct tcp_pcb
*pcb
, struct ip_addr
*ipaddr
, u16_t port
)
259 struct tcp_pcb
*cpcb
;
261 LWIP_ERROR("tcp_connect: can only bind in state CLOSED", pcb
->state
== CLOSED
, return ERR_ISCONN
);
264 port
= tcp_new_port();
266 /* Check if the address already is in use. */
267 /* Check the listen pcbs. */
268 for(cpcb
= (struct tcp_pcb
*)tcp_listen_pcbs
.pcbs
;
269 cpcb
!= NULL
; cpcb
= cpcb
->next
) {
270 if (cpcb
->local_port
== port
) {
271 if (ip_addr_isany(&(cpcb
->local_ip
)) ||
272 ip_addr_isany(ipaddr
) ||
273 ip_addr_cmp(&(cpcb
->local_ip
), ipaddr
)) {
278 /* Check the connected pcbs. */
279 for(cpcb
= tcp_active_pcbs
;
280 cpcb
!= NULL
; cpcb
= cpcb
->next
) {
281 if (cpcb
->local_port
== port
) {
282 if (ip_addr_isany(&(cpcb
->local_ip
)) ||
283 ip_addr_isany(ipaddr
) ||
284 ip_addr_cmp(&(cpcb
->local_ip
), ipaddr
)) {
289 /* Check the bound, not yet connected pcbs. */
290 for(cpcb
= tcp_bound_pcbs
; cpcb
!= NULL
; cpcb
= cpcb
->next
) {
291 if (cpcb
->local_port
== port
) {
292 if (ip_addr_isany(&(cpcb
->local_ip
)) ||
293 ip_addr_isany(ipaddr
) ||
294 ip_addr_cmp(&(cpcb
->local_ip
), ipaddr
)) {
299 /* @todo: until SO_REUSEADDR is implemented (see task #6995 on savannah),
300 * we have to check the pcbs in TIME-WAIT state, also: */
301 for(cpcb
= tcp_tw_pcbs
; cpcb
!= NULL
; cpcb
= cpcb
->next
) {
302 if (cpcb
->local_port
== port
) {
303 if (ip_addr_cmp(&(cpcb
->local_ip
), ipaddr
)) {
309 if (!ip_addr_isany(ipaddr
)) {
310 pcb
->local_ip
= *ipaddr
;
312 pcb
->local_port
= port
;
313 TCP_REG(&tcp_bound_pcbs
, pcb
);
314 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_bind: bind to port %"U16_F
"\n", port
));
317 #if LWIP_CALLBACK_API
319 * Default accept callback if no accept callback is specified by the user.
322 tcp_accept_null(void *arg
, struct tcp_pcb
*pcb
, err_t err
)
324 LWIP_UNUSED_ARG(arg
);
325 LWIP_UNUSED_ARG(pcb
);
326 LWIP_UNUSED_ARG(err
);
330 #endif /* LWIP_CALLBACK_API */
333 * Set the state of the connection to be LISTEN, which means that it
334 * is able to accept incoming connections. The protocol control block
335 * is reallocated in order to consume less memory. Setting the
336 * connection to LISTEN is an irreversible process.
338 * @param pcb the original tcp_pcb
339 * @param backlog the incoming connections queue limit
340 * @return tcp_pcb used for listening, consumes less memory.
342 * @note The original tcp_pcb is freed. This function therefore has to be
344 * tpcb = tcp_listen(tpcb);
347 tcp_listen_with_backlog(struct tcp_pcb
*pcb
, u8_t backlog
)
349 struct tcp_pcb_listen
*lpcb
;
351 LWIP_UNUSED_ARG(backlog
);
352 LWIP_ERROR("tcp_listen: pcb already connected", pcb
->state
== CLOSED
, return NULL
);
354 /* already listening? */
355 if (pcb
->state
== LISTEN
) {
358 lpcb
= memp_malloc(MEMP_TCP_PCB_LISTEN
);
362 lpcb
->callback_arg
= pcb
->callback_arg
;
363 lpcb
->local_port
= pcb
->local_port
;
364 lpcb
->state
= LISTEN
;
365 lpcb
->so_options
= pcb
->so_options
;
366 lpcb
->so_options
|= SOF_ACCEPTCONN
;
367 lpcb
->ttl
= pcb
->ttl
;
368 lpcb
->tos
= pcb
->tos
;
369 ip_addr_set(&lpcb
->local_ip
, &pcb
->local_ip
);
370 TCP_RMV(&tcp_bound_pcbs
, pcb
);
371 memp_free(MEMP_TCP_PCB
, pcb
);
372 #if LWIP_CALLBACK_API
373 lpcb
->accept
= tcp_accept_null
;
374 #endif /* LWIP_CALLBACK_API */
375 #if TCP_LISTEN_BACKLOG
376 lpcb
->accepts_pending
= 0;
377 lpcb
->backlog
= (backlog
? backlog
: 1);
378 #endif /* TCP_LISTEN_BACKLOG */
379 TCP_REG(&tcp_listen_pcbs
.listen_pcbs
, lpcb
);
380 return (struct tcp_pcb
*)lpcb
;
384 * This function should be called by the application when it has
385 * processed the data. The purpose is to advertise a larger window
386 * when the data has been processed.
388 * @param pcb the tcp_pcb for which data is read
389 * @param len the amount of bytes that have been read by the application
392 tcp_recved(struct tcp_pcb
*pcb
, u16_t len
)
394 if ((u32_t
)pcb
->rcv_wnd
+ len
> TCP_WND
) {
395 pcb
->rcv_wnd
= TCP_WND
;
396 pcb
->rcv_ann_wnd
= TCP_WND
;
399 if (pcb
->rcv_wnd
>= pcb
->mss
) {
400 pcb
->rcv_ann_wnd
= pcb
->rcv_wnd
;
404 if (!(pcb
->flags
& TF_ACK_DELAY
) &&
405 !(pcb
->flags
& TF_ACK_NOW
)) {
407 * We send an ACK here (if one is not already pending, hence
408 * the above tests) as tcp_recved() implies that the application
409 * has processed some data, and so we can open the receiver's
410 * window to allow more to be transmitted. This could result in
411 * two ACKs being sent for each received packet in some limited cases
412 * (where the application is only receiving data, and is slow to
413 * process it) but it is necessary to guarantee that the sender can
414 * continue to transmit.
418 else if (pcb
->flags
& TF_ACK_DELAY
&& pcb
->rcv_wnd
>= TCP_WND
/2) {
419 /* If we can send a window update such that there is a full
420 * segment available in the window, do so now. This is sort of
421 * nagle-like in its goals, and tries to hit a compromise between
422 * sending acks each time the window is updated, and only sending
423 * window updates when a timer expires. The "threshold" used
424 * above (currently TCP_WND/2) can be tuned to be more or less
429 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_recved: recveived %"U16_F
" bytes, wnd %"U16_F
" (%"U16_F
").\n",
430 len
, pcb
->rcv_wnd
, TCP_WND
- pcb
->rcv_wnd
));
434 * A nastly hack featuring 'goto' statements that allocates a
435 * new TCP local port.
437 * @return a new (free) local TCP port number
443 #ifndef TCP_LOCAL_PORT_RANGE_START
444 #define TCP_LOCAL_PORT_RANGE_START 4096
445 #define TCP_LOCAL_PORT_RANGE_END 0x7fff
447 static u16_t port
= TCP_LOCAL_PORT_RANGE_START
;
450 if (++port
> TCP_LOCAL_PORT_RANGE_END
) {
451 port
= TCP_LOCAL_PORT_RANGE_START
;
454 for(pcb
= tcp_active_pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
455 if (pcb
->local_port
== port
) {
459 for(pcb
= tcp_tw_pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
460 if (pcb
->local_port
== port
) {
464 for(pcb
= (struct tcp_pcb
*)tcp_listen_pcbs
.pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
465 if (pcb
->local_port
== port
) {
473 * Connects to another host. The function given as the "connected"
474 * argument will be called when the connection has been established.
476 * @param pcb the tcp_pcb used to establish the connection
477 * @param ipaddr the remote ip address to connect to
478 * @param port the remote tcp port to connect to
479 * @param connected callback function to call when connected (or on error)
480 * @return ERR_VAL if invalid arguments are given
481 * ERR_OK if connect request has been sent
482 * other err_t values if connect request couldn't be sent
485 tcp_connect(struct tcp_pcb
*pcb
, struct ip_addr
*ipaddr
, u16_t port
,
486 err_t (* connected
)(void *arg
, struct tcp_pcb
*tpcb
, err_t err
))
492 LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb
->state
== CLOSED
, return ERR_ISCONN
);
494 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_connect to port %"U16_F
"\n", port
));
495 if (ipaddr
!= NULL
) {
496 pcb
->remote_ip
= *ipaddr
;
500 pcb
->remote_port
= port
;
501 if (pcb
->local_port
== 0) {
502 pcb
->local_port
= tcp_new_port();
504 iss
= tcp_next_iss();
507 pcb
->lastack
= iss
- 1;
508 pcb
->snd_lbb
= iss
- 1;
509 pcb
->rcv_wnd
= TCP_WND
;
510 pcb
->rcv_ann_wnd
= TCP_WND
;
511 pcb
->snd_wnd
= TCP_WND
;
512 /* The send MSS is updated when an MSS option is received. */
513 pcb
->mss
= (TCP_MSS
> 536) ? 536 : TCP_MSS
;
514 #if TCP_CALCULATE_EFF_SEND_MSS
515 pcb
->mss
= tcp_eff_send_mss(pcb
->mss
, ipaddr
);
516 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
518 pcb
->ssthresh
= pcb
->mss
* 10;
519 pcb
->state
= SYN_SENT
;
520 #if LWIP_CALLBACK_API
521 pcb
->connected
= connected
;
522 #endif /* LWIP_CALLBACK_API */
523 TCP_RMV(&tcp_bound_pcbs
, pcb
);
524 TCP_REG(&tcp_active_pcbs
, pcb
);
526 snmp_inc_tcpactiveopens();
528 /* Build an MSS option */
529 optdata
= TCP_BUILD_MSS_OPTION();
531 ret
= tcp_enqueue(pcb
, NULL
, 0, TCP_SYN
, 0, (u8_t
*)&optdata
, 4);
539 * Called every 500 ms and implements the retransmission timer and the timer that
540 * removes PCBs that have been in TIME-WAIT for enough time. It also increments
541 * various timers such as the inactivity timer in each PCB.
543 * Automatically called from tcp_tmr().
548 struct tcp_pcb
*pcb
, *pcb2
, *prev
;
550 u8_t pcb_remove
; /* flag if a PCB should be removed */
557 /* Steps through all of the active PCBs. */
559 pcb
= tcp_active_pcbs
;
561 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_slowtmr: no active pcbs\n"));
563 while (pcb
!= NULL
) {
564 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_slowtmr: processing active pcb\n"));
565 LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb
->state
!= CLOSED
);
566 LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb
->state
!= LISTEN
);
567 LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb
->state
!= TIME_WAIT
);
571 if (pcb
->state
== SYN_SENT
&& pcb
->nrtx
== TCP_SYNMAXRTX
) {
573 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_slowtmr: max SYN retries reached\n"));
575 else if (pcb
->nrtx
== TCP_MAXRTX
) {
577 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_slowtmr: max DATA retries reached\n"));
579 if (pcb
->persist_backoff
> 0) {
580 /* If snd_wnd is zero, use persist timer to send 1 byte probes
581 * instead of using the standard retransmission mechanism. */
583 if (pcb
->persist_cnt
>= tcp_persist_backoff
[pcb
->persist_backoff
-1]) {
584 pcb
->persist_cnt
= 0;
585 if (pcb
->persist_backoff
< sizeof(tcp_persist_backoff
)) {
586 pcb
->persist_backoff
++;
588 tcp_zero_window_probe(pcb
);
591 /* Increase the retransmission timer if it is running */
595 if (pcb
->unacked
!= NULL
&& pcb
->rtime
>= pcb
->rto
) {
596 /* Time for a retransmission. */
597 LWIP_DEBUGF(TCP_RTO_DEBUG
, ("tcp_slowtmr: rtime %"S16_F
598 " pcb->rto %"S16_F
"\n",
599 pcb
->rtime
, pcb
->rto
));
601 /* Double retransmission time-out unless we are trying to
602 * connect to somebody (i.e., we are in SYN_SENT). */
603 if (pcb
->state
!= SYN_SENT
) {
604 pcb
->rto
= ((pcb
->sa
>> 3) + pcb
->sv
) << tcp_backoff
[pcb
->nrtx
];
607 /* Reset the retransmission timer. */
610 /* Reduce congestion window and ssthresh. */
611 eff_wnd
= LWIP_MIN(pcb
->cwnd
, pcb
->snd_wnd
);
612 pcb
->ssthresh
= eff_wnd
>> 1;
613 if (pcb
->ssthresh
< pcb
->mss
) {
614 pcb
->ssthresh
= pcb
->mss
* 2;
616 pcb
->cwnd
= pcb
->mss
;
617 LWIP_DEBUGF(TCP_CWND_DEBUG
, ("tcp_slowtmr: cwnd %"U16_F
618 " ssthresh %"U16_F
"\n",
619 pcb
->cwnd
, pcb
->ssthresh
));
621 /* The following needs to be called AFTER cwnd is set to one
627 /* Check if this PCB has stayed too long in FIN-WAIT-2 */
628 if (pcb
->state
== FIN_WAIT_2
) {
629 if ((u32_t
)(tcp_ticks
- pcb
->tmr
) >
630 TCP_FIN_WAIT_TIMEOUT
/ TCP_SLOW_INTERVAL
) {
632 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
636 /* Check if KEEPALIVE should be sent */
637 if((pcb
->so_options
& SOF_KEEPALIVE
) &&
638 ((pcb
->state
== ESTABLISHED
) ||
639 (pcb
->state
== CLOSE_WAIT
))) {
640 #if LWIP_TCP_KEEPALIVE
641 if((u32_t
)(tcp_ticks
- pcb
->tmr
) >
642 (pcb
->keep_idle
+ (pcb
->keep_cnt
*pcb
->keep_intvl
))
645 if((u32_t
)(tcp_ticks
- pcb
->tmr
) >
646 (pcb
->keep_idle
+ TCP_MAXIDLE
) / TCP_SLOW_INTERVAL
)
647 #endif /* LWIP_TCP_KEEPALIVE */
649 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F
".%"U16_F
".%"U16_F
".%"U16_F
".\n",
650 ip4_addr1(&pcb
->remote_ip
), ip4_addr2(&pcb
->remote_ip
),
651 ip4_addr3(&pcb
->remote_ip
), ip4_addr4(&pcb
->remote_ip
)));
655 #if LWIP_TCP_KEEPALIVE
656 else if((u32_t
)(tcp_ticks
- pcb
->tmr
) >
657 (pcb
->keep_idle
+ pcb
->keep_cnt_sent
* pcb
->keep_intvl
)
660 else if((u32_t
)(tcp_ticks
- pcb
->tmr
) >
661 (pcb
->keep_idle
+ pcb
->keep_cnt_sent
* TCP_KEEPINTVL_DEFAULT
)
663 #endif /* LWIP_TCP_KEEPALIVE */
666 pcb
->keep_cnt_sent
++;
670 /* If this PCB has queued out of sequence data, but has been
671 inactive for too long, will drop the data (it will eventually
672 be retransmitted). */
674 if (pcb
->ooseq
!= NULL
&&
675 (u32_t
)tcp_ticks
- pcb
->tmr
>= pcb
->rto
* TCP_OOSEQ_TIMEOUT
) {
676 tcp_segs_free(pcb
->ooseq
);
678 LWIP_DEBUGF(TCP_CWND_DEBUG
, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
680 #endif /* TCP_QUEUE_OOSEQ */
682 /* Check if this PCB has stayed too long in SYN-RCVD */
683 if (pcb
->state
== SYN_RCVD
) {
684 if ((u32_t
)(tcp_ticks
- pcb
->tmr
) >
685 TCP_SYN_RCVD_TIMEOUT
/ TCP_SLOW_INTERVAL
) {
687 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
691 /* Check if this PCB has stayed too long in LAST-ACK */
692 if (pcb
->state
== LAST_ACK
) {
693 if ((u32_t
)(tcp_ticks
- pcb
->tmr
) > 2 * TCP_MSL
/ TCP_SLOW_INTERVAL
) {
695 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
699 /* If the PCB should be removed, do it. */
702 /* Remove PCB from tcp_active_pcbs list. */
704 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb
!= tcp_active_pcbs
);
705 prev
->next
= pcb
->next
;
707 /* This PCB was the first. */
708 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs
== pcb
);
709 tcp_active_pcbs
= pcb
->next
;
712 TCP_EVENT_ERR(pcb
->errf
, pcb
->callback_arg
, ERR_ABRT
);
715 memp_free(MEMP_TCP_PCB
, pcb
);
719 /* We check if we should poll the connection. */
721 if (pcb
->polltmr
>= pcb
->pollinterval
) {
723 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_slowtmr: polling application\n"));
724 TCP_EVENT_POLL(pcb
, err
);
736 /* Steps through all of the TIME-WAIT PCBs. */
739 while (pcb
!= NULL
) {
740 LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb
->state
== TIME_WAIT
);
743 /* Check if this PCB has stayed long enough in TIME-WAIT */
744 if ((u32_t
)(tcp_ticks
- pcb
->tmr
) > 2 * TCP_MSL
/ TCP_SLOW_INTERVAL
) {
750 /* If the PCB should be removed, do it. */
753 /* Remove PCB from tcp_tw_pcbs list. */
755 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb
!= tcp_tw_pcbs
);
756 prev
->next
= pcb
->next
;
758 /* This PCB was the first. */
759 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs
== pcb
);
760 tcp_tw_pcbs
= pcb
->next
;
763 memp_free(MEMP_TCP_PCB
, pcb
);
773 * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
774 * "refused" by upper layer (application) and sends delayed ACKs.
776 * Automatically called from tcp_tmr().
783 for(pcb
= tcp_active_pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
784 /* If there is data which was previously "refused" by upper layer */
785 if (pcb
->refused_data
!= NULL
) {
786 /* Notify again application with data previously received. */
788 LWIP_DEBUGF(TCP_INPUT_DEBUG
, ("tcp_fasttmr: notify kept packet\n"));
789 TCP_EVENT_RECV(pcb
, pcb
->refused_data
, ERR_OK
, err
);
791 pcb
->refused_data
= NULL
;
795 /* send delayed ACKs */
796 if (pcb
->flags
& TF_ACK_DELAY
) {
797 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_fasttmr: delayed ACK\n"));
799 pcb
->flags
&= ~(TF_ACK_DELAY
| TF_ACK_NOW
);
805 * Deallocates a list of TCP segments (tcp_seg structures).
807 * @param seg tcp_seg list of TCP segments to free
808 * @return the number of pbufs that were deallocated
811 tcp_segs_free(struct tcp_seg
*seg
)
814 struct tcp_seg
*next
;
815 while (seg
!= NULL
) {
817 count
+= tcp_seg_free(seg
);
824 * Frees a TCP segment (tcp_seg structure).
826 * @param seg single tcp_seg to free
827 * @return the number of pbufs that were deallocated
830 tcp_seg_free(struct tcp_seg
*seg
)
835 if (seg
->p
!= NULL
) {
836 count
= pbuf_free(seg
->p
);
839 #endif /* TCP_DEBUG */
841 memp_free(MEMP_TCP_SEG
, seg
);
847 * Sets the priority of a connection.
849 * @param pcb the tcp_pcb to manipulate
850 * @param prio new priority
853 tcp_setprio(struct tcp_pcb
*pcb
, u8_t prio
)
860 * Returns a copy of the given TCP segment.
861 * The pbuf and data are not copied, only the pointers
863 * @param seg the old tcp_seg
864 * @return a copy of seg
867 tcp_seg_copy(struct tcp_seg
*seg
)
869 struct tcp_seg
*cseg
;
871 cseg
= memp_malloc(MEMP_TCP_SEG
);
875 SMEMCPY((u8_t
*)cseg
, (const u8_t
*)seg
, sizeof(struct tcp_seg
));
881 #if LWIP_CALLBACK_API
883 * Default receive callback that is called if the user didn't register
884 * a recv callback for the pcb.
887 tcp_recv_null(void *arg
, struct tcp_pcb
*pcb
, struct pbuf
*p
, err_t err
)
892 } else if (err
== ERR_OK
) {
893 return tcp_close(pcb
);
897 #endif /* LWIP_CALLBACK_API */
900 * Kills the oldest active connection that has lower priority than prio.
902 * @param prio minimum priority
905 tcp_kill_prio(u8_t prio
)
907 struct tcp_pcb
*pcb
, *inactive
;
912 mprio
= TCP_PRIO_MAX
;
914 /* We kill the oldest active connection that has lower priority than prio. */
917 for(pcb
= tcp_active_pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
918 if (pcb
->prio
<= prio
&&
919 pcb
->prio
<= mprio
&&
920 (u32_t
)(tcp_ticks
- pcb
->tmr
) >= inactivity
) {
921 inactivity
= tcp_ticks
- pcb
->tmr
;
926 if (inactive
!= NULL
) {
927 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F
")\n",
928 (void *)inactive
, inactivity
));
934 * Kills the oldest connection that is in TIME_WAIT state.
935 * Called from tcp_alloc() if no more connections are available.
938 tcp_kill_timewait(void)
940 struct tcp_pcb
*pcb
, *inactive
;
945 /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
946 for(pcb
= tcp_tw_pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
947 if ((u32_t
)(tcp_ticks
- pcb
->tmr
) >= inactivity
) {
948 inactivity
= tcp_ticks
- pcb
->tmr
;
952 if (inactive
!= NULL
) {
953 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F
")\n",
954 (void *)inactive
, inactivity
));
960 * Allocate a new tcp_pcb structure.
962 * @param prio priority for the new pcb
963 * @return a new tcp_pcb that initially is in state CLOSED
971 pcb
= memp_malloc(MEMP_TCP_PCB
);
973 /* Try killing oldest connection in TIME-WAIT. */
974 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
976 /* Try to allocate a tcp_pcb again. */
977 pcb
= memp_malloc(MEMP_TCP_PCB
);
979 /* Try killing active connections with lower priority than the new one. */
981 /* Try to allocate a tcp_pcb again. */
982 pcb
= memp_malloc(MEMP_TCP_PCB
);
986 memset(pcb
, 0, sizeof(struct tcp_pcb
));
987 pcb
->prio
= TCP_PRIO_NORMAL
;
988 pcb
->snd_buf
= TCP_SND_BUF
;
989 pcb
->snd_queuelen
= 0;
990 pcb
->rcv_wnd
= TCP_WND
;
991 pcb
->rcv_ann_wnd
= TCP_WND
;
994 /* The send MSS is updated when an MSS option is received. */
995 pcb
->mss
= (TCP_MSS
> 536) ? 536 : TCP_MSS
;
996 pcb
->rto
= 3000 / TCP_SLOW_INTERVAL
;
998 pcb
->sv
= 3000 / TCP_SLOW_INTERVAL
;
1001 iss
= tcp_next_iss();
1007 pcb
->tmr
= tcp_ticks
;
1011 #if LWIP_CALLBACK_API
1012 pcb
->recv
= tcp_recv_null
;
1013 #endif /* LWIP_CALLBACK_API */
1015 /* Init KEEPALIVE timer */
1016 pcb
->keep_idle
= TCP_KEEPIDLE_DEFAULT
;
1018 #if LWIP_TCP_KEEPALIVE
1019 pcb
->keep_intvl
= TCP_KEEPINTVL_DEFAULT
;
1020 pcb
->keep_cnt
= TCP_KEEPCNT_DEFAULT
;
1021 #endif /* LWIP_TCP_KEEPALIVE */
1023 pcb
->keep_cnt_sent
= 0;
1029 * Creates a new TCP protocol control block but doesn't place it on
1030 * any of the TCP PCB lists.
1031 * The pcb is not put on any list until binding using tcp_bind().
1033 * @internal: Maybe there should be a idle TCP PCB list where these
1034 * PCBs are put on. Port reservation using tcp_bind() is implemented but
1035 * allocated pcbs that are not bound can't be killed automatically if wanting
1036 * to allocate a pcb with higher prio (@see tcp_kill_prio())
1038 * @return a new tcp_pcb that initially is in state CLOSED
1043 return tcp_alloc(TCP_PRIO_NORMAL
);
1047 * Used to specify the argument that should be passed callback
1050 * @param pcb tcp_pcb to set the callback argument
1051 * @param arg void pointer argument to pass to callback functions
1054 tcp_arg(struct tcp_pcb
*pcb
, void *arg
)
1056 pcb
->callback_arg
= arg
;
1058 #if LWIP_CALLBACK_API
1061 * Used to specify the function that should be called when a TCP
1062 * connection receives data.
1064 * @param pcb tcp_pcb to set the recv callback
1065 * @param recv callback function to call for this pcb when data is received
1068 tcp_recv(struct tcp_pcb
*pcb
,
1069 err_t (* recv
)(void *arg
, struct tcp_pcb
*tpcb
, struct pbuf
*p
, err_t err
))
1075 * Used to specify the function that should be called when TCP data
1076 * has been successfully delivered to the remote host.
1078 * @param pcb tcp_pcb to set the sent callback
1079 * @param sent callback function to call for this pcb when data is successfully sent
1082 tcp_sent(struct tcp_pcb
*pcb
,
1083 err_t (* sent
)(void *arg
, struct tcp_pcb
*tpcb
, u16_t len
))
1089 * Used to specify the function that should be called when a fatal error
1090 * has occured on the connection.
1092 * @param pcb tcp_pcb to set the err callback
1093 * @param errf callback function to call for this pcb when a fatal error
1094 * has occured on the connection
1097 tcp_err(struct tcp_pcb
*pcb
,
1098 void (* errf
)(void *arg
, err_t err
))
1104 * Used for specifying the function that should be called when a
1105 * LISTENing connection has been connected to another host.
1107 * @param pcb tcp_pcb to set the accept callback
1108 * @param accept callback function to call for this pcb when LISTENing
1109 * connection has been connected to another host
1112 tcp_accept(struct tcp_pcb
*pcb
,
1113 err_t (* accept
)(void *arg
, struct tcp_pcb
*newpcb
, err_t err
))
1115 ((struct tcp_pcb_listen
*)pcb
)->accept
= accept
;
1117 #endif /* LWIP_CALLBACK_API */
1121 * Used to specify the function that should be called periodically
1122 * from TCP. The interval is specified in terms of the TCP coarse
1123 * timer interval, which is called twice a second.
1127 tcp_poll(struct tcp_pcb
*pcb
,
1128 err_t (* poll
)(void *arg
, struct tcp_pcb
*tpcb
), u8_t interval
)
1130 #if LWIP_CALLBACK_API
1132 #endif /* LWIP_CALLBACK_API */
1133 pcb
->pollinterval
= interval
;
1137 * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
1138 * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
1140 * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
1143 tcp_pcb_purge(struct tcp_pcb
*pcb
)
1145 if (pcb
->state
!= CLOSED
&&
1146 pcb
->state
!= TIME_WAIT
&&
1147 pcb
->state
!= LISTEN
) {
1149 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_pcb_purge\n"));
1151 if (pcb
->refused_data
!= NULL
) {
1152 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_pcb_purge: data left on ->refused_data\n"));
1153 pbuf_free(pcb
->refused_data
);
1154 pcb
->refused_data
= NULL
;
1156 if (pcb
->unsent
!= NULL
) {
1157 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_pcb_purge: not all data sent\n"));
1159 if (pcb
->unacked
!= NULL
) {
1160 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_pcb_purge: data left on ->unacked\n"));
1162 #if TCP_QUEUE_OOSEQ /* LW */
1163 if (pcb
->ooseq
!= NULL
) {
1164 LWIP_DEBUGF(TCP_DEBUG
, ("tcp_pcb_purge: data left on ->ooseq\n"));
1167 /* Stop the retransmission timer as it will expect data on unacked
1168 queue if it fires */
1171 tcp_segs_free(pcb
->ooseq
);
1173 #endif /* TCP_QUEUE_OOSEQ */
1174 tcp_segs_free(pcb
->unsent
);
1175 tcp_segs_free(pcb
->unacked
);
1176 pcb
->unacked
= pcb
->unsent
= NULL
;
1181 * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
1183 * @param pcblist PCB list to purge.
1184 * @param pcb tcp_pcb to purge. The pcb itself is also deallocated!
1187 tcp_pcb_remove(struct tcp_pcb
**pcblist
, struct tcp_pcb
*pcb
)
1189 TCP_RMV(pcblist
, pcb
);
1193 /* if there is an outstanding delayed ACKs, send it */
1194 if (pcb
->state
!= TIME_WAIT
&&
1195 pcb
->state
!= LISTEN
&&
1196 pcb
->flags
& TF_ACK_DELAY
) {
1197 pcb
->flags
|= TF_ACK_NOW
;
1201 if (pcb
->state
!= LISTEN
) {
1202 LWIP_ASSERT("unsent segments leaking", pcb
->unsent
== NULL
);
1203 LWIP_ASSERT("unacked segments leaking", pcb
->unacked
== NULL
);
1205 LWIP_ASSERT("ooseq segments leaking", pcb
->ooseq
== NULL
);
1206 #endif /* TCP_QUEUE_OOSEQ */
1209 pcb
->state
= CLOSED
;
1211 LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
1215 * Calculates a new initial sequence number for new connections.
1217 * @return u32_t pseudo random sequence number
1222 static u32_t iss
= 6510;
1224 iss
+= tcp_ticks
; /* XXX */
1228 #if TCP_CALCULATE_EFF_SEND_MSS
1230 * Calcluates the effective send mss that can be used for a specific IP address
1231 * by using ip_route to determin the netif used to send to the address and
1232 * calculating the minimum of TCP_MSS and that netif's mtu (if set).
1235 tcp_eff_send_mss(u16_t sendmss
, struct ip_addr
*addr
)
1238 struct netif
*outif
;
1240 outif
= ip_route(addr
);
1241 if ((outif
!= NULL
) && (outif
->mtu
!= 0)) {
1242 mss_s
= outif
->mtu
- IP_HLEN
- TCP_HLEN
;
1243 /* RFC 1122, chap 4.2.2.6:
1244 * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
1245 * but we only send options with SYN and that is never filled with data! */
1246 sendmss
= LWIP_MIN(sendmss
, mss_s
);
1250 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
1252 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
1254 * Print a tcp header for debugging purposes.
1256 * @param tcphdr pointer to a struct tcp_hdr
1259 tcp_debug_print(struct tcp_hdr
*tcphdr
)
1261 LWIP_DEBUGF(TCP_DEBUG
, ("TCP header:\n"));
1262 LWIP_DEBUGF(TCP_DEBUG
, ("+-------------------------------+\n"));
1263 LWIP_DEBUGF(TCP_DEBUG
, ("| %5"U16_F
" | %5"U16_F
" | (src port, dest port)\n",
1264 ntohs(tcphdr
->src
), ntohs(tcphdr
->dest
)));
1265 LWIP_DEBUGF(TCP_DEBUG
, ("+-------------------------------+\n"));
1266 LWIP_DEBUGF(TCP_DEBUG
, ("| %010"U32_F
" | (seq no)\n",
1267 ntohl(tcphdr
->seqno
)));
1268 LWIP_DEBUGF(TCP_DEBUG
, ("+-------------------------------+\n"));
1269 LWIP_DEBUGF(TCP_DEBUG
, ("| %010"U32_F
" | (ack no)\n",
1270 ntohl(tcphdr
->ackno
)));
1271 LWIP_DEBUGF(TCP_DEBUG
, ("+-------------------------------+\n"));
1272 LWIP_DEBUGF(TCP_DEBUG
, ("| %2"U16_F
" | |%"U16_F
"%"U16_F
"%"U16_F
"%"U16_F
"%"U16_F
"%"U16_F
"| %5"U16_F
" | (hdrlen, flags (",
1273 TCPH_HDRLEN(tcphdr
),
1274 TCPH_FLAGS(tcphdr
) >> 5 & 1,
1275 TCPH_FLAGS(tcphdr
) >> 4 & 1,
1276 TCPH_FLAGS(tcphdr
) >> 3 & 1,
1277 TCPH_FLAGS(tcphdr
) >> 2 & 1,
1278 TCPH_FLAGS(tcphdr
) >> 1 & 1,
1279 TCPH_FLAGS(tcphdr
) & 1,
1280 ntohs(tcphdr
->wnd
)));
1281 tcp_debug_print_flags(TCPH_FLAGS(tcphdr
));
1282 LWIP_DEBUGF(TCP_DEBUG
, ("), win)\n"));
1283 LWIP_DEBUGF(TCP_DEBUG
, ("+-------------------------------+\n"));
1284 LWIP_DEBUGF(TCP_DEBUG
, ("| 0x%04"X16_F
" | %5"U16_F
" | (chksum, urgp)\n",
1285 ntohs(tcphdr
->chksum
), ntohs(tcphdr
->urgp
)));
1286 LWIP_DEBUGF(TCP_DEBUG
, ("+-------------------------------+\n"));
1290 * Print a tcp state for debugging purposes.
1292 * @param s enum tcp_state to print
1295 tcp_debug_print_state(enum tcp_state s
)
1297 LWIP_DEBUGF(TCP_DEBUG
, ("State: "));
1300 LWIP_DEBUGF(TCP_DEBUG
, ("CLOSED\n"));
1303 LWIP_DEBUGF(TCP_DEBUG
, ("LISTEN\n"));
1306 LWIP_DEBUGF(TCP_DEBUG
, ("SYN_SENT\n"));
1309 LWIP_DEBUGF(TCP_DEBUG
, ("SYN_RCVD\n"));
1312 LWIP_DEBUGF(TCP_DEBUG
, ("ESTABLISHED\n"));
1315 LWIP_DEBUGF(TCP_DEBUG
, ("FIN_WAIT_1\n"));
1318 LWIP_DEBUGF(TCP_DEBUG
, ("FIN_WAIT_2\n"));
1321 LWIP_DEBUGF(TCP_DEBUG
, ("CLOSE_WAIT\n"));
1324 LWIP_DEBUGF(TCP_DEBUG
, ("CLOSING\n"));
1327 LWIP_DEBUGF(TCP_DEBUG
, ("LAST_ACK\n"));
1330 LWIP_DEBUGF(TCP_DEBUG
, ("TIME_WAIT\n"));
1336 * Print tcp flags for debugging purposes.
1338 * @param flags tcp flags, all active flags are printed
1341 tcp_debug_print_flags(u8_t flags
)
1343 if (flags
& TCP_FIN
) {
1344 LWIP_DEBUGF(TCP_DEBUG
, ("FIN "));
1346 if (flags
& TCP_SYN
) {
1347 LWIP_DEBUGF(TCP_DEBUG
, ("SYN "));
1349 if (flags
& TCP_RST
) {
1350 LWIP_DEBUGF(TCP_DEBUG
, ("RST "));
1352 if (flags
& TCP_PSH
) {
1353 LWIP_DEBUGF(TCP_DEBUG
, ("PSH "));
1355 if (flags
& TCP_ACK
) {
1356 LWIP_DEBUGF(TCP_DEBUG
, ("ACK "));
1358 if (flags
& TCP_URG
) {
1359 LWIP_DEBUGF(TCP_DEBUG
, ("URG "));
1361 if (flags
& TCP_ECE
) {
1362 LWIP_DEBUGF(TCP_DEBUG
, ("ECE "));
1364 if (flags
& TCP_CWR
) {
1365 LWIP_DEBUGF(TCP_DEBUG
, ("CWR "));
1370 * Print all tcp_pcbs in every list for debugging purposes.
1373 tcp_debug_print_pcbs(void)
1375 struct tcp_pcb
*pcb
;
1376 LWIP_DEBUGF(TCP_DEBUG
, ("Active PCB states:\n"));
1377 for(pcb
= tcp_active_pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
1378 LWIP_DEBUGF(TCP_DEBUG
, ("Local port %"U16_F
", foreign port %"U16_F
" snd_nxt %"U32_F
" rcv_nxt %"U32_F
" ",
1379 pcb
->local_port
, pcb
->remote_port
,
1380 pcb
->snd_nxt
, pcb
->rcv_nxt
));
1381 tcp_debug_print_state(pcb
->state
);
1383 LWIP_DEBUGF(TCP_DEBUG
, ("Listen PCB states:\n"));
1384 for(pcb
= (struct tcp_pcb
*)tcp_listen_pcbs
.pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
1385 LWIP_DEBUGF(TCP_DEBUG
, ("Local port %"U16_F
", foreign port %"U16_F
" snd_nxt %"U32_F
" rcv_nxt %"U32_F
" ",
1386 pcb
->local_port
, pcb
->remote_port
,
1387 pcb
->snd_nxt
, pcb
->rcv_nxt
));
1388 tcp_debug_print_state(pcb
->state
);
1390 LWIP_DEBUGF(TCP_DEBUG
, ("TIME-WAIT PCB states:\n"));
1391 for(pcb
= tcp_tw_pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
1392 LWIP_DEBUGF(TCP_DEBUG
, ("Local port %"U16_F
", foreign port %"U16_F
" snd_nxt %"U32_F
" rcv_nxt %"U32_F
" ",
1393 pcb
->local_port
, pcb
->remote_port
,
1394 pcb
->snd_nxt
, pcb
->rcv_nxt
));
1395 tcp_debug_print_state(pcb
->state
);
1400 * Check state consistency of the tcp_pcb lists.
1405 struct tcp_pcb
*pcb
;
1406 for(pcb
= tcp_active_pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
1407 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb
->state
!= CLOSED
);
1408 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb
->state
!= LISTEN
);
1409 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb
->state
!= TIME_WAIT
);
1411 for(pcb
= tcp_tw_pcbs
; pcb
!= NULL
; pcb
= pcb
->next
) {
1412 LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb
->state
== TIME_WAIT
);
1416 #endif /* TCP_DEBUG */
1418 #endif /* LWIP_TCP */