TCPSpeedTest - I have a problem getting this to work. Server onl…

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Jesper Taxbøl / Mbed 2 deprecated TCPSpeedTest

I have a problem getting this to work. Server only recieves half of the data being sent. Whats wrong

lwip/core/tcp.c@0:66300c77c6e9, 2011-03-29 (annotated)

Committer:: tax
Date:: Tue Mar 29 13:20:15 2011 +0000
Revision:: 0:66300c77c6e9

Who changed what in which revision?

User	Revision	Line number	New contents of line
tax	0:66300c77c6e9	1	/**
tax	0:66300c77c6e9	2	* @file
tax	0:66300c77c6e9	3	* Transmission Control Protocol for IP
tax	0:66300c77c6e9	4	*
tax	0:66300c77c6e9	5	* This file contains common functions for the TCP implementation, such as functinos
tax	0:66300c77c6e9	6	* for manipulating the data structures and the TCP timer functions. TCP functions
tax	0:66300c77c6e9	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
tax	0:66300c77c6e9	8	*
tax	0:66300c77c6e9	9	*/
tax	0:66300c77c6e9	10
tax	0:66300c77c6e9	11	/*
tax	0:66300c77c6e9	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
tax	0:66300c77c6e9	13	* All rights reserved.
tax	0:66300c77c6e9	14	*
tax	0:66300c77c6e9	15	* Redistribution and use in source and binary forms, with or without modification,
tax	0:66300c77c6e9	16	* are permitted provided that the following conditions are met:
tax	0:66300c77c6e9	17	*
tax	0:66300c77c6e9	18	* 1. Redistributions of source code must retain the above copyright notice,
tax	0:66300c77c6e9	19	* this list of conditions and the following disclaimer.
tax	0:66300c77c6e9	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
tax	0:66300c77c6e9	21	* this list of conditions and the following disclaimer in the documentation
tax	0:66300c77c6e9	22	* and/or other materials provided with the distribution.
tax	0:66300c77c6e9	23	* 3. The name of the author may not be used to endorse or promote products
tax	0:66300c77c6e9	24	* derived from this software without specific prior written permission.
tax	0:66300c77c6e9	25	*
tax	0:66300c77c6e9	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
tax	0:66300c77c6e9	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
tax	0:66300c77c6e9	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
tax	0:66300c77c6e9	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
tax	0:66300c77c6e9	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
tax	0:66300c77c6e9	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
tax	0:66300c77c6e9	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
tax	0:66300c77c6e9	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
tax	0:66300c77c6e9	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
tax	0:66300c77c6e9	35	* OF SUCH DAMAGE.
tax	0:66300c77c6e9	36	*
tax	0:66300c77c6e9	37	* This file is part of the lwIP TCP/IP stack.
tax	0:66300c77c6e9	38	*
tax	0:66300c77c6e9	39	* Author: Adam Dunkels <adam@sics.se>
tax	0:66300c77c6e9	40	*
tax	0:66300c77c6e9	41	*/
tax	0:66300c77c6e9	42
tax	0:66300c77c6e9	43	#include "lwip/opt.h"
tax	0:66300c77c6e9	44
tax	0:66300c77c6e9	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
tax	0:66300c77c6e9	46
tax	0:66300c77c6e9	47	#include "lwip/def.h"
tax	0:66300c77c6e9	48	#include "lwip/mem.h"
tax	0:66300c77c6e9	49	#include "lwip/memp.h"
tax	0:66300c77c6e9	50	#include "lwip/snmp.h"
tax	0:66300c77c6e9	51	#include "lwip/tcp.h"
tax	0:66300c77c6e9	52	#include "lwip/tcp_impl.h"
tax	0:66300c77c6e9	53	#include "lwip/debug.h"
tax	0:66300c77c6e9	54	#include "lwip/stats.h"
tax	0:66300c77c6e9	55
tax	0:66300c77c6e9	56	#include <string.h>
tax	0:66300c77c6e9	57
tax	0:66300c77c6e9	58	const char * const tcp_state_str[] = {
tax	0:66300c77c6e9	59	"CLOSED",
tax	0:66300c77c6e9	60	"LISTEN",
tax	0:66300c77c6e9	61	"SYN_SENT",
tax	0:66300c77c6e9	62	"SYN_RCVD",
tax	0:66300c77c6e9	63	"ESTABLISHED",
tax	0:66300c77c6e9	64	"FIN_WAIT_1",
tax	0:66300c77c6e9	65	"FIN_WAIT_2",
tax	0:66300c77c6e9	66	"CLOSE_WAIT",
tax	0:66300c77c6e9	67	"CLOSING",
tax	0:66300c77c6e9	68	"LAST_ACK",
tax	0:66300c77c6e9	69	"TIME_WAIT"
tax	0:66300c77c6e9	70	};
tax	0:66300c77c6e9	71
tax	0:66300c77c6e9	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
tax	0:66300c77c6e9	73	u32_t tcp_ticks;
tax	0:66300c77c6e9	74	const u8_t tcp_backoff[13] =
tax	0:66300c77c6e9	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
tax	0:66300c77c6e9	76	/* Times per slowtmr hits */
tax	0:66300c77c6e9	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
tax	0:66300c77c6e9	78
tax	0:66300c77c6e9	79	/* The TCP PCB lists. */
tax	0:66300c77c6e9	80
tax	0:66300c77c6e9	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
tax	0:66300c77c6e9	82	struct tcp_pcb *tcp_bound_pcbs;
tax	0:66300c77c6e9	83	/** List of all TCP PCBs in LISTEN state */
tax	0:66300c77c6e9	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
tax	0:66300c77c6e9	85	/** List of all TCP PCBs that are in a state in which
tax	0:66300c77c6e9	86	* they accept or send data. */
tax	0:66300c77c6e9	87	struct tcp_pcb *tcp_active_pcbs;
tax	0:66300c77c6e9	88	/** List of all TCP PCBs in TIME-WAIT state */
tax	0:66300c77c6e9	89	struct tcp_pcb *tcp_tw_pcbs;
tax	0:66300c77c6e9	90
tax	0:66300c77c6e9	91	#define NUM_TCP_PCB_LISTS 4
tax	0:66300c77c6e9	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
tax	0:66300c77c6e9	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
tax	0:66300c77c6e9	94	struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
tax	0:66300c77c6e9	95	&tcp_active_pcbs, &tcp_tw_pcbs};
tax	0:66300c77c6e9	96
tax	0:66300c77c6e9	97	/** Only used for temporary storage. */
tax	0:66300c77c6e9	98	struct tcp_pcb *tcp_tmp_pcb;
tax	0:66300c77c6e9	99
tax	0:66300c77c6e9	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
tax	0:66300c77c6e9	101	static u8_t tcp_timer;
tax	0:66300c77c6e9	102	static u16_t tcp_new_port(void);
tax	0:66300c77c6e9	103
tax	0:66300c77c6e9	104	/**
tax	0:66300c77c6e9	105	* Called periodically to dispatch TCP timers.
tax	0:66300c77c6e9	106	*
tax	0:66300c77c6e9	107	*/
tax	0:66300c77c6e9	108	void
tax	0:66300c77c6e9	109	tcp_tmr(void)
tax	0:66300c77c6e9	110	{
tax	0:66300c77c6e9	111	/* Call tcp_fasttmr() every 250 ms */
tax	0:66300c77c6e9	112	tcp_fasttmr();
tax	0:66300c77c6e9	113
tax	0:66300c77c6e9	114	if (++tcp_timer & 1) {
tax	0:66300c77c6e9	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
tax	0:66300c77c6e9	116	tcp_tmr() is called. */
tax	0:66300c77c6e9	117	tcp_slowtmr();
tax	0:66300c77c6e9	118	}
tax	0:66300c77c6e9	119	}
tax	0:66300c77c6e9	120
tax	0:66300c77c6e9	121	/**
tax	0:66300c77c6e9	122	* Closes the TX side of a connection held by the PCB.
tax	0:66300c77c6e9	123	* For tcp_close(), a RST is sent if the application didn't receive all data
tax	0:66300c77c6e9	124	* (tcp_recved() not called for all data passed to recv callback).
tax	0:66300c77c6e9	125	*
tax	0:66300c77c6e9	126	* Listening pcbs are freed and may not be referenced any more.
tax	0:66300c77c6e9	127	* Connection pcbs are freed if not yet connected and may not be referenced
tax	0:66300c77c6e9	128	* any more. If a connection is established (at least SYN received or in
tax	0:66300c77c6e9	129	* a closing state), the connection is closed, and put in a closing state.
tax	0:66300c77c6e9	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
tax	0:66300c77c6e9	131	* unsafe to reference it.
tax	0:66300c77c6e9	132	*
tax	0:66300c77c6e9	133	* @param pcb the tcp_pcb to close
tax	0:66300c77c6e9	134	* @return ERR_OK if connection has been closed
tax	0:66300c77c6e9	135	* another err_t if closing failed and pcb is not freed
tax	0:66300c77c6e9	136	*/
tax	0:66300c77c6e9	137	static err_t
tax	0:66300c77c6e9	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
tax	0:66300c77c6e9	139	{
tax	0:66300c77c6e9	140	err_t err;
tax	0:66300c77c6e9	141
tax	0:66300c77c6e9	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
tax	0:66300c77c6e9	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
tax	0:66300c77c6e9	144	/* Not all data received by application, send RST to tell the remote
tax	0:66300c77c6e9	145	side about this. */
tax	0:66300c77c6e9	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
tax	0:66300c77c6e9	147
tax	0:66300c77c6e9	148	/* don't call tcp_abort here: we must not deallocate the pcb since
tax	0:66300c77c6e9	149	that might not be expected when calling tcp_close */
tax	0:66300c77c6e9	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
tax	0:66300c77c6e9	151	pcb->local_port, pcb->remote_port);
tax	0:66300c77c6e9	152
tax	0:66300c77c6e9	153	tcp_pcb_purge(pcb);
tax	0:66300c77c6e9	154
tax	0:66300c77c6e9	155	/* TODO: to which state do we move now? */
tax	0:66300c77c6e9	156
tax	0:66300c77c6e9	157	/* move to TIME_WAIT since we close actively */
tax	0:66300c77c6e9	158	TCP_RMV(&tcp_active_pcbs, pcb);
tax	0:66300c77c6e9	159	pcb->state = TIME_WAIT;
tax	0:66300c77c6e9	160	TCP_REG(&tcp_tw_pcbs, pcb);
tax	0:66300c77c6e9	161
tax	0:66300c77c6e9	162	return ERR_OK;
tax	0:66300c77c6e9	163	}
tax	0:66300c77c6e9	164	}
tax	0:66300c77c6e9	165
tax	0:66300c77c6e9	166	switch (pcb->state) {
tax	0:66300c77c6e9	167	case CLOSED:
tax	0:66300c77c6e9	168	/* Closing a pcb in the CLOSED state might seem erroneous,
tax	0:66300c77c6e9	169	* however, it is in this state once allocated and as yet unused
tax	0:66300c77c6e9	170	* and the user needs some way to free it should the need arise.
tax	0:66300c77c6e9	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
tax	0:66300c77c6e9	172	* or for a pcb that has been used and then entered the CLOSED state
tax	0:66300c77c6e9	173	* is erroneous, but this should never happen as the pcb has in those cases
tax	0:66300c77c6e9	174	* been freed, and so any remaining handles are bogus. */
tax	0:66300c77c6e9	175	err = ERR_OK;
tax	0:66300c77c6e9	176	TCP_RMV(&tcp_bound_pcbs, pcb);
tax	0:66300c77c6e9	177	memp_free(MEMP_TCP_PCB, pcb);
tax	0:66300c77c6e9	178	pcb = NULL;
tax	0:66300c77c6e9	179	break;
tax	0:66300c77c6e9	180	case LISTEN:
tax	0:66300c77c6e9	181	err = ERR_OK;
tax	0:66300c77c6e9	182	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
tax	0:66300c77c6e9	183	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
tax	0:66300c77c6e9	184	pcb = NULL;
tax	0:66300c77c6e9	185	break;
tax	0:66300c77c6e9	186	case SYN_SENT:
tax	0:66300c77c6e9	187	err = ERR_OK;
tax	0:66300c77c6e9	188	tcp_pcb_remove(&tcp_active_pcbs, pcb);
tax	0:66300c77c6e9	189	memp_free(MEMP_TCP_PCB, pcb);
tax	0:66300c77c6e9	190	pcb = NULL;
tax	0:66300c77c6e9	191	snmp_inc_tcpattemptfails();
tax	0:66300c77c6e9	192	break;
tax	0:66300c77c6e9	193	case SYN_RCVD:
tax	0:66300c77c6e9	194	err = tcp_send_fin(pcb);
tax	0:66300c77c6e9	195	if (err == ERR_OK) {
tax	0:66300c77c6e9	196	snmp_inc_tcpattemptfails();
tax	0:66300c77c6e9	197	pcb->state = FIN_WAIT_1;
tax	0:66300c77c6e9	198	}
tax	0:66300c77c6e9	199	break;
tax	0:66300c77c6e9	200	case ESTABLISHED:
tax	0:66300c77c6e9	201	err = tcp_send_fin(pcb);
tax	0:66300c77c6e9	202	if (err == ERR_OK) {
tax	0:66300c77c6e9	203	snmp_inc_tcpestabresets();
tax	0:66300c77c6e9	204	pcb->state = FIN_WAIT_1;
tax	0:66300c77c6e9	205	}
tax	0:66300c77c6e9	206	break;
tax	0:66300c77c6e9	207	case CLOSE_WAIT:
tax	0:66300c77c6e9	208	err = tcp_send_fin(pcb);
tax	0:66300c77c6e9	209	if (err == ERR_OK) {
tax	0:66300c77c6e9	210	snmp_inc_tcpestabresets();
tax	0:66300c77c6e9	211	pcb->state = LAST_ACK;
tax	0:66300c77c6e9	212	}
tax	0:66300c77c6e9	213	break;
tax	0:66300c77c6e9	214	default:
tax	0:66300c77c6e9	215	/* Has already been closed, do nothing. */
tax	0:66300c77c6e9	216	err = ERR_OK;
tax	0:66300c77c6e9	217	pcb = NULL;
tax	0:66300c77c6e9	218	break;
tax	0:66300c77c6e9	219	}
tax	0:66300c77c6e9	220
tax	0:66300c77c6e9	221	if (pcb != NULL && err == ERR_OK) {
tax	0:66300c77c6e9	222	/* To ensure all data has been sent when tcp_close returns, we have
tax	0:66300c77c6e9	223	to make sure tcp_output doesn't fail.
tax	0:66300c77c6e9	224	Since we don't really have to ensure all data has been sent when tcp_close
tax	0:66300c77c6e9	225	returns (unsent data is sent from tcp timer functions, also), we don't care
tax	0:66300c77c6e9	226	for the return value of tcp_output for now. */
tax	0:66300c77c6e9	227	/* @todo: When implementing SO_LINGER, this must be changed somehow:
tax	0:66300c77c6e9	228	If SOF_LINGER is set, the data should be sent and acked before close returns.
tax	0:66300c77c6e9	229	This can only be valid for sequential APIs, not for the raw API. */
tax	0:66300c77c6e9	230	tcp_output(pcb);
tax	0:66300c77c6e9	231	}
tax	0:66300c77c6e9	232	return err;
tax	0:66300c77c6e9	233	}
tax	0:66300c77c6e9	234
tax	0:66300c77c6e9	235	/**
tax	0:66300c77c6e9	236	* Closes the connection held by the PCB.
tax	0:66300c77c6e9	237	*
tax	0:66300c77c6e9	238	* Listening pcbs are freed and may not be referenced any more.
tax	0:66300c77c6e9	239	* Connection pcbs are freed if not yet connected and may not be referenced
tax	0:66300c77c6e9	240	* any more. If a connection is established (at least SYN received or in
tax	0:66300c77c6e9	241	* a closing state), the connection is closed, and put in a closing state.
tax	0:66300c77c6e9	242	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
tax	0:66300c77c6e9	243	* unsafe to reference it (unless an error is returned).
tax	0:66300c77c6e9	244	*
tax	0:66300c77c6e9	245	* @param pcb the tcp_pcb to close
tax	0:66300c77c6e9	246	* @return ERR_OK if connection has been closed
tax	0:66300c77c6e9	247	* another err_t if closing failed and pcb is not freed
tax	0:66300c77c6e9	248	*/
tax	0:66300c77c6e9	249	err_t
tax	0:66300c77c6e9	250	tcp_close(struct tcp_pcb *pcb)
tax	0:66300c77c6e9	251	{
tax	0:66300c77c6e9	252	#if TCP_DEBUG
tax	0:66300c77c6e9	253	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
tax	0:66300c77c6e9	254	tcp_debug_print_state(pcb->state);
tax	0:66300c77c6e9	255	#endif /* TCP_DEBUG */
tax	0:66300c77c6e9	256
tax	0:66300c77c6e9	257	if (pcb->state != LISTEN) {
tax	0:66300c77c6e9	258	/* Set a flag not to receive any more data... */
tax	0:66300c77c6e9	259	pcb->flags \|= TF_RXCLOSED;
tax	0:66300c77c6e9	260	}
tax	0:66300c77c6e9	261	/* ... and close */
tax	0:66300c77c6e9	262	return tcp_close_shutdown(pcb, 1);
tax	0:66300c77c6e9	263	}
tax	0:66300c77c6e9	264
tax	0:66300c77c6e9	265	/**
tax	0:66300c77c6e9	266	* Causes all or part of a full-duplex connection of this PCB to be shut down.
tax	0:66300c77c6e9	267	* This doesn't deallocate the PCB!
tax	0:66300c77c6e9	268	*
tax	0:66300c77c6e9	269	* @param pcb PCB to shutdown
tax	0:66300c77c6e9	270	* @param shut_rx shut down receive side if this is != 0
tax	0:66300c77c6e9	271	* @param shut_tx shut down send side if this is != 0
tax	0:66300c77c6e9	272	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
tax	0:66300c77c6e9	273	* another err_t on error.
tax	0:66300c77c6e9	274	*/
tax	0:66300c77c6e9	275	err_t
tax	0:66300c77c6e9	276	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
tax	0:66300c77c6e9	277	{
tax	0:66300c77c6e9	278	if (pcb->state == LISTEN) {
tax	0:66300c77c6e9	279	return ERR_CONN;
tax	0:66300c77c6e9	280	}
tax	0:66300c77c6e9	281	if (shut_rx) {
tax	0:66300c77c6e9	282	/* shut down the receive side: free buffered data... */
tax	0:66300c77c6e9	283	if (pcb->refused_data != NULL) {
tax	0:66300c77c6e9	284	pbuf_free(pcb->refused_data);
tax	0:66300c77c6e9	285	pcb->refused_data = NULL;
tax	0:66300c77c6e9	286	}
tax	0:66300c77c6e9	287	/* ... and set a flag not to receive any more data */
tax	0:66300c77c6e9	288	pcb->flags \|= TF_RXCLOSED;
tax	0:66300c77c6e9	289	}
tax	0:66300c77c6e9	290	if (shut_tx) {
tax	0:66300c77c6e9	291	/* This can't happen twice since if it succeeds, the pcb's state is changed.
tax	0:66300c77c6e9	292	Only close in these states as the others directly deallocate the PCB */
tax	0:66300c77c6e9	293	switch (pcb->state) {
tax	0:66300c77c6e9	294	case SYN_RCVD:
tax	0:66300c77c6e9	295	case ESTABLISHED:
tax	0:66300c77c6e9	296	case CLOSE_WAIT:
tax	0:66300c77c6e9	297	return tcp_close_shutdown(pcb, 0);
tax	0:66300c77c6e9	298	default:
tax	0:66300c77c6e9	299	/* don't shut down other states */
tax	0:66300c77c6e9	300	break;
tax	0:66300c77c6e9	301	}
tax	0:66300c77c6e9	302	}
tax	0:66300c77c6e9	303	/* @todo: return another err_t if not in correct state or already shut? */
tax	0:66300c77c6e9	304	return ERR_OK;
tax	0:66300c77c6e9	305	}
tax	0:66300c77c6e9	306
tax	0:66300c77c6e9	307	/**
tax	0:66300c77c6e9	308	* Abandons a connection and optionally sends a RST to the remote
tax	0:66300c77c6e9	309	* host. Deletes the local protocol control block. This is done when
tax	0:66300c77c6e9	310	* a connection is killed because of shortage of memory.
tax	0:66300c77c6e9	311	*
tax	0:66300c77c6e9	312	* @param pcb the tcp_pcb to abort
tax	0:66300c77c6e9	313	* @param reset boolean to indicate whether a reset should be sent
tax	0:66300c77c6e9	314	*/
tax	0:66300c77c6e9	315	void
tax	0:66300c77c6e9	316	tcp_abandon(struct tcp_pcb *pcb, int reset)
tax	0:66300c77c6e9	317	{
tax	0:66300c77c6e9	318	u32_t seqno, ackno;
tax	0:66300c77c6e9	319	u16_t remote_port, local_port;
tax	0:66300c77c6e9	320	ip_addr_t remote_ip, local_ip;
tax	0:66300c77c6e9	321	#if LWIP_CALLBACK_API
tax	0:66300c77c6e9	322	tcp_err_fn errf;
tax	0:66300c77c6e9	323	#endif /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	324	void *errf_arg;
tax	0:66300c77c6e9	325
tax	0:66300c77c6e9	326	/* pcb->state LISTEN not allowed here */
tax	0:66300c77c6e9	327	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
tax	0:66300c77c6e9	328	pcb->state != LISTEN);
tax	0:66300c77c6e9	329	/* Figure out on which TCP PCB list we are, and remove us. If we
tax	0:66300c77c6e9	330	are in an active state, call the receive function associated with
tax	0:66300c77c6e9	331	the PCB with a NULL argument, and send an RST to the remote end. */
tax	0:66300c77c6e9	332	if (pcb->state == TIME_WAIT) {
tax	0:66300c77c6e9	333	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
tax	0:66300c77c6e9	334	memp_free(MEMP_TCP_PCB, pcb);
tax	0:66300c77c6e9	335	} else {
tax	0:66300c77c6e9	336	seqno = pcb->snd_nxt;
tax	0:66300c77c6e9	337	ackno = pcb->rcv_nxt;
tax	0:66300c77c6e9	338	ip_addr_copy(local_ip, pcb->local_ip);
tax	0:66300c77c6e9	339	ip_addr_copy(remote_ip, pcb->remote_ip);
tax	0:66300c77c6e9	340	local_port = pcb->local_port;
tax	0:66300c77c6e9	341	remote_port = pcb->remote_port;
tax	0:66300c77c6e9	342	#if LWIP_CALLBACK_API
tax	0:66300c77c6e9	343	errf = pcb->errf;
tax	0:66300c77c6e9	344	#endif /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	345	errf_arg = pcb->callback_arg;
tax	0:66300c77c6e9	346	tcp_pcb_remove(&tcp_active_pcbs, pcb);
tax	0:66300c77c6e9	347	if (pcb->unacked != NULL) {
tax	0:66300c77c6e9	348	tcp_segs_free(pcb->unacked);
tax	0:66300c77c6e9	349	}
tax	0:66300c77c6e9	350	if (pcb->unsent != NULL) {
tax	0:66300c77c6e9	351	tcp_segs_free(pcb->unsent);
tax	0:66300c77c6e9	352	}
tax	0:66300c77c6e9	353	#if TCP_QUEUE_OOSEQ
tax	0:66300c77c6e9	354	if (pcb->ooseq != NULL) {
tax	0:66300c77c6e9	355	tcp_segs_free(pcb->ooseq);
tax	0:66300c77c6e9	356	}
tax	0:66300c77c6e9	357	#endif /* TCP_QUEUE_OOSEQ */
tax	0:66300c77c6e9	358	memp_free(MEMP_TCP_PCB, pcb);
tax	0:66300c77c6e9	359	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
tax	0:66300c77c6e9	360	if (reset) {
tax	0:66300c77c6e9	361	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
tax	0:66300c77c6e9	362	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
tax	0:66300c77c6e9	363	}
tax	0:66300c77c6e9	364	}
tax	0:66300c77c6e9	365	}
tax	0:66300c77c6e9	366
tax	0:66300c77c6e9	367	/**
tax	0:66300c77c6e9	368	* Aborts the connection by sending a RST (reset) segment to the remote
tax	0:66300c77c6e9	369	* host. The pcb is deallocated. This function never fails.
tax	0:66300c77c6e9	370	*
tax	0:66300c77c6e9	371	* ATTENTION: When calling this from one of the TCP callbacks, make
tax	0:66300c77c6e9	372	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
tax	0:66300c77c6e9	373	* or you will risk accessing deallocated memory or memory leaks!
tax	0:66300c77c6e9	374	*
tax	0:66300c77c6e9	375	* @param pcb the tcp pcb to abort
tax	0:66300c77c6e9	376	*/
tax	0:66300c77c6e9	377	void
tax	0:66300c77c6e9	378	tcp_abort(struct tcp_pcb *pcb)
tax	0:66300c77c6e9	379	{
tax	0:66300c77c6e9	380	tcp_abandon(pcb, 1);
tax	0:66300c77c6e9	381	}
tax	0:66300c77c6e9	382
tax	0:66300c77c6e9	383	/**
tax	0:66300c77c6e9	384	* Binds the connection to a local portnumber and IP address. If the
tax	0:66300c77c6e9	385	* IP address is not given (i.e., ipaddr == NULL), the IP address of
tax	0:66300c77c6e9	386	* the outgoing network interface is used instead.
tax	0:66300c77c6e9	387	*
tax	0:66300c77c6e9	388	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
tax	0:66300c77c6e9	389	* already bound!)
tax	0:66300c77c6e9	390	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
tax	0:66300c77c6e9	391	* to any local address
tax	0:66300c77c6e9	392	* @param port the local port to bind to
tax	0:66300c77c6e9	393	* @return ERR_USE if the port is already in use
tax	0:66300c77c6e9	394	* ERR_OK if bound
tax	0:66300c77c6e9	395	*/
tax	0:66300c77c6e9	396	err_t
tax	0:66300c77c6e9	397	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
tax	0:66300c77c6e9	398	{
tax	0:66300c77c6e9	399	int i;
tax	0:66300c77c6e9	400	int max_pcb_list = NUM_TCP_PCB_LISTS;
tax	0:66300c77c6e9	401	struct tcp_pcb *cpcb;
tax	0:66300c77c6e9	402
tax	0:66300c77c6e9	403	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
tax	0:66300c77c6e9	404
tax	0:66300c77c6e9	405	#if SO_REUSE
tax	0:66300c77c6e9	406	/* Unless the REUSEADDR flag is set,
tax	0:66300c77c6e9	407	we have to check the pcbs in TIME-WAIT state, also.
tax	0:66300c77c6e9	408	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
tax	0:66300c77c6e9	409	packets using both local and remote IP addresses and ports to distinguish.
tax	0:66300c77c6e9	410	*/
tax	0:66300c77c6e9	411	#if SO_REUSE
tax	0:66300c77c6e9	412	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
tax	0:66300c77c6e9	413	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
tax	0:66300c77c6e9	414	}
tax	0:66300c77c6e9	415	#endif /* SO_REUSE */
tax	0:66300c77c6e9	416	#endif /* SO_REUSE */
tax	0:66300c77c6e9	417
tax	0:66300c77c6e9	418	if (port == 0) {
tax	0:66300c77c6e9	419	port = tcp_new_port();
tax	0:66300c77c6e9	420	}
tax	0:66300c77c6e9	421
tax	0:66300c77c6e9	422	/* Check if the address already is in use (on all lists) */
tax	0:66300c77c6e9	423	for (i = 0; i < max_pcb_list; i++) {
tax	0:66300c77c6e9	424	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
tax	0:66300c77c6e9	425	if (cpcb->local_port == port) {
tax	0:66300c77c6e9	426	#if SO_REUSE
tax	0:66300c77c6e9	427	/* Omit checking for the same port if both pcbs have REUSEADDR set.
tax	0:66300c77c6e9	428	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
tax	0:66300c77c6e9	429	tcp_connect. */
tax	0:66300c77c6e9	430	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
tax	0:66300c77c6e9	431	((cpcb->so_options & SOF_REUSEADDR) == 0))
tax	0:66300c77c6e9	432	#endif /* SO_REUSE */
tax	0:66300c77c6e9	433	{
tax	0:66300c77c6e9	434	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
tax	0:66300c77c6e9	435	ip_addr_isany(ipaddr) \|\|
tax	0:66300c77c6e9	436	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
tax	0:66300c77c6e9	437	return ERR_USE;
tax	0:66300c77c6e9	438	}
tax	0:66300c77c6e9	439	}
tax	0:66300c77c6e9	440	}
tax	0:66300c77c6e9	441	}
tax	0:66300c77c6e9	442	}
tax	0:66300c77c6e9	443
tax	0:66300c77c6e9	444	if (!ip_addr_isany(ipaddr)) {
tax	0:66300c77c6e9	445	pcb->local_ip = *ipaddr;
tax	0:66300c77c6e9	446	}
tax	0:66300c77c6e9	447	pcb->local_port = port;
tax	0:66300c77c6e9	448	TCP_REG(&tcp_bound_pcbs, pcb);
tax	0:66300c77c6e9	449	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
tax	0:66300c77c6e9	450	return ERR_OK;
tax	0:66300c77c6e9	451	}
tax	0:66300c77c6e9	452	#if LWIP_CALLBACK_API
tax	0:66300c77c6e9	453	/**
tax	0:66300c77c6e9	454	* Default accept callback if no accept callback is specified by the user.
tax	0:66300c77c6e9	455	*/
tax	0:66300c77c6e9	456	static err_t
tax	0:66300c77c6e9	457	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
tax	0:66300c77c6e9	458	{
tax	0:66300c77c6e9	459	LWIP_UNUSED_ARG(arg);
tax	0:66300c77c6e9	460	LWIP_UNUSED_ARG(pcb);
tax	0:66300c77c6e9	461	LWIP_UNUSED_ARG(err);
tax	0:66300c77c6e9	462
tax	0:66300c77c6e9	463	return ERR_ABRT;
tax	0:66300c77c6e9	464	}
tax	0:66300c77c6e9	465	#endif /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	466
tax	0:66300c77c6e9	467	/**
tax	0:66300c77c6e9	468	* Set the state of the connection to be LISTEN, which means that it
tax	0:66300c77c6e9	469	* is able to accept incoming connections. The protocol control block
tax	0:66300c77c6e9	470	* is reallocated in order to consume less memory. Setting the
tax	0:66300c77c6e9	471	* connection to LISTEN is an irreversible process.
tax	0:66300c77c6e9	472	*
tax	0:66300c77c6e9	473	* @param pcb the original tcp_pcb
tax	0:66300c77c6e9	474	* @param backlog the incoming connections queue limit
tax	0:66300c77c6e9	475	* @return tcp_pcb used for listening, consumes less memory.
tax	0:66300c77c6e9	476	*
tax	0:66300c77c6e9	477	* @note The original tcp_pcb is freed. This function therefore has to be
tax	0:66300c77c6e9	478	* called like this:
tax	0:66300c77c6e9	479	* tpcb = tcp_listen(tpcb);
tax	0:66300c77c6e9	480	*/
tax	0:66300c77c6e9	481	struct tcp_pcb *
tax	0:66300c77c6e9	482	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
tax	0:66300c77c6e9	483	{
tax	0:66300c77c6e9	484	struct tcp_pcb_listen *lpcb;
tax	0:66300c77c6e9	485
tax	0:66300c77c6e9	486	LWIP_UNUSED_ARG(backlog);
tax	0:66300c77c6e9	487	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
tax	0:66300c77c6e9	488
tax	0:66300c77c6e9	489	/* already listening? */
tax	0:66300c77c6e9	490	if (pcb->state == LISTEN) {
tax	0:66300c77c6e9	491	return pcb;
tax	0:66300c77c6e9	492	}
tax	0:66300c77c6e9	493	#if SO_REUSE
tax	0:66300c77c6e9	494	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
tax	0:66300c77c6e9	495	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
tax	0:66300c77c6e9	496	is declared (listen-/connection-pcb), we have to make sure now that
tax	0:66300c77c6e9	497	this port is only used once for every local IP. */
tax	0:66300c77c6e9	498	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
tax	0:66300c77c6e9	499	if (lpcb->local_port == pcb->local_port) {
tax	0:66300c77c6e9	500	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
tax	0:66300c77c6e9	501	/* this address/port is already used */
tax	0:66300c77c6e9	502	return NULL;
tax	0:66300c77c6e9	503	}
tax	0:66300c77c6e9	504	}
tax	0:66300c77c6e9	505	}
tax	0:66300c77c6e9	506	}
tax	0:66300c77c6e9	507	#endif /* SO_REUSE */
tax	0:66300c77c6e9	508	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
tax	0:66300c77c6e9	509	if (lpcb == NULL) {
tax	0:66300c77c6e9	510	return NULL;
tax	0:66300c77c6e9	511	}
tax	0:66300c77c6e9	512	lpcb->callback_arg = pcb->callback_arg;
tax	0:66300c77c6e9	513	lpcb->local_port = pcb->local_port;
tax	0:66300c77c6e9	514	lpcb->state = LISTEN;
tax	0:66300c77c6e9	515	lpcb->prio = pcb->prio;
tax	0:66300c77c6e9	516	lpcb->so_options = pcb->so_options;
tax	0:66300c77c6e9	517	lpcb->so_options \|= SOF_ACCEPTCONN;
tax	0:66300c77c6e9	518	lpcb->ttl = pcb->ttl;
tax	0:66300c77c6e9	519	lpcb->tos = pcb->tos;
tax	0:66300c77c6e9	520	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
tax	0:66300c77c6e9	521	TCP_RMV(&tcp_bound_pcbs, pcb);
tax	0:66300c77c6e9	522	memp_free(MEMP_TCP_PCB, pcb);
tax	0:66300c77c6e9	523	#if LWIP_CALLBACK_API
tax	0:66300c77c6e9	524	lpcb->accept = tcp_accept_null;
tax	0:66300c77c6e9	525	#endif /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	526	#if TCP_LISTEN_BACKLOG
tax	0:66300c77c6e9	527	lpcb->accepts_pending = 0;
tax	0:66300c77c6e9	528	lpcb->backlog = (backlog ? backlog : 1);
tax	0:66300c77c6e9	529	#endif /* TCP_LISTEN_BACKLOG */
tax	0:66300c77c6e9	530	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
tax	0:66300c77c6e9	531	return (struct tcp_pcb *)lpcb;
tax	0:66300c77c6e9	532	}
tax	0:66300c77c6e9	533
tax	0:66300c77c6e9	534	/**
tax	0:66300c77c6e9	535	* Update the state that tracks the available window space to advertise.
tax	0:66300c77c6e9	536	*
tax	0:66300c77c6e9	537	* Returns how much extra window would be advertised if we sent an
tax	0:66300c77c6e9	538	* update now.
tax	0:66300c77c6e9	539	*/
tax	0:66300c77c6e9	540	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
tax	0:66300c77c6e9	541	{
tax	0:66300c77c6e9	542	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
tax	0:66300c77c6e9	543
tax	0:66300c77c6e9	544	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
tax	0:66300c77c6e9	545	/* we can advertise more window */
tax	0:66300c77c6e9	546	pcb->rcv_ann_wnd = pcb->rcv_wnd;
tax	0:66300c77c6e9	547	return new_right_edge - pcb->rcv_ann_right_edge;
tax	0:66300c77c6e9	548	} else {
tax	0:66300c77c6e9	549	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
tax	0:66300c77c6e9	550	/* Can happen due to other end sending out of advertised window,
tax	0:66300c77c6e9	551	* but within actual available (but not yet advertised) window */
tax	0:66300c77c6e9	552	pcb->rcv_ann_wnd = 0;
tax	0:66300c77c6e9	553	} else {
tax	0:66300c77c6e9	554	/* keep the right edge of window constant */
tax	0:66300c77c6e9	555	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
tax	0:66300c77c6e9	556	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
tax	0:66300c77c6e9	557	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
tax	0:66300c77c6e9	558	}
tax	0:66300c77c6e9	559	return 0;
tax	0:66300c77c6e9	560	}
tax	0:66300c77c6e9	561	}
tax	0:66300c77c6e9	562
tax	0:66300c77c6e9	563	/**
tax	0:66300c77c6e9	564	* This function should be called by the application when it has
tax	0:66300c77c6e9	565	* processed the data. The purpose is to advertise a larger window
tax	0:66300c77c6e9	566	* when the data has been processed.
tax	0:66300c77c6e9	567	*
tax	0:66300c77c6e9	568	* @param pcb the tcp_pcb for which data is read
tax	0:66300c77c6e9	569	* @param len the amount of bytes that have been read by the application
tax	0:66300c77c6e9	570	*/
tax	0:66300c77c6e9	571	void
tax	0:66300c77c6e9	572	tcp_recved(struct tcp_pcb *pcb, u16_t len)
tax	0:66300c77c6e9	573	{
tax	0:66300c77c6e9	574	int wnd_inflation;
tax	0:66300c77c6e9	575
tax	0:66300c77c6e9	576	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
tax	0:66300c77c6e9	577	len <= 0xffff - pcb->rcv_wnd );
tax	0:66300c77c6e9	578
tax	0:66300c77c6e9	579	pcb->rcv_wnd += len;
tax	0:66300c77c6e9	580	if (pcb->rcv_wnd > TCP_WND) {
tax	0:66300c77c6e9	581	pcb->rcv_wnd = TCP_WND;
tax	0:66300c77c6e9	582	}
tax	0:66300c77c6e9	583
tax	0:66300c77c6e9	584	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
tax	0:66300c77c6e9	585
tax	0:66300c77c6e9	586	/* If the change in the right edge of window is significant (default
tax	0:66300c77c6e9	587	* watermark is TCP_WND/4), then send an explicit update now.
tax	0:66300c77c6e9	588	* Otherwise wait for a packet to be sent in the normal course of
tax	0:66300c77c6e9	589	* events (or more window to be available later) */
tax	0:66300c77c6e9	590	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
tax	0:66300c77c6e9	591	tcp_ack_now(pcb);
tax	0:66300c77c6e9	592	tcp_output(pcb);
tax	0:66300c77c6e9	593	}
tax	0:66300c77c6e9	594
tax	0:66300c77c6e9	595	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
tax	0:66300c77c6e9	596	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
tax	0:66300c77c6e9	597	}
tax	0:66300c77c6e9	598
tax	0:66300c77c6e9	599	/**
tax	0:66300c77c6e9	600	* A nastly hack featuring 'goto' statements that allocates a
tax	0:66300c77c6e9	601	* new TCP local port.
tax	0:66300c77c6e9	602	*
tax	0:66300c77c6e9	603	* @return a new (free) local TCP port number
tax	0:66300c77c6e9	604	*/
tax	0:66300c77c6e9	605	static u16_t
tax	0:66300c77c6e9	606	tcp_new_port(void)
tax	0:66300c77c6e9	607	{
tax	0:66300c77c6e9	608	int i;
tax	0:66300c77c6e9	609	struct tcp_pcb *pcb;
tax	0:66300c77c6e9	610	#ifndef TCP_LOCAL_PORT_RANGE_START
tax	0:66300c77c6e9	611	#define TCP_LOCAL_PORT_RANGE_START 4096
tax	0:66300c77c6e9	612	#define TCP_LOCAL_PORT_RANGE_END 0x7fff
tax	0:66300c77c6e9	613	#endif
tax	0:66300c77c6e9	614	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
tax	0:66300c77c6e9	615
tax	0:66300c77c6e9	616	again:
tax	0:66300c77c6e9	617	if (++port > TCP_LOCAL_PORT_RANGE_END) {
tax	0:66300c77c6e9	618	port = TCP_LOCAL_PORT_RANGE_START;
tax	0:66300c77c6e9	619	}
tax	0:66300c77c6e9	620	/* Check all PCB lists. */
tax	0:66300c77c6e9	621	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
tax	0:66300c77c6e9	622	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
tax	0:66300c77c6e9	623	if (pcb->local_port == port) {
tax	0:66300c77c6e9	624	goto again;
tax	0:66300c77c6e9	625	}
tax	0:66300c77c6e9	626	}
tax	0:66300c77c6e9	627	}
tax	0:66300c77c6e9	628	return port;
tax	0:66300c77c6e9	629	}
tax	0:66300c77c6e9	630
tax	0:66300c77c6e9	631	/**
tax	0:66300c77c6e9	632	* Connects to another host. The function given as the "connected"
tax	0:66300c77c6e9	633	* argument will be called when the connection has been established.
tax	0:66300c77c6e9	634	*
tax	0:66300c77c6e9	635	* @param pcb the tcp_pcb used to establish the connection
tax	0:66300c77c6e9	636	* @param ipaddr the remote ip address to connect to
tax	0:66300c77c6e9	637	* @param port the remote tcp port to connect to
tax	0:66300c77c6e9	638	* @param connected callback function to call when connected (or on error)
tax	0:66300c77c6e9	639	* @return ERR_VAL if invalid arguments are given
tax	0:66300c77c6e9	640	* ERR_OK if connect request has been sent
tax	0:66300c77c6e9	641	* other err_t values if connect request couldn't be sent
tax	0:66300c77c6e9	642	*/
tax	0:66300c77c6e9	643	err_t
tax	0:66300c77c6e9	644	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
tax	0:66300c77c6e9	645	tcp_connected_fn connected)
tax	0:66300c77c6e9	646	{
tax	0:66300c77c6e9	647	err_t ret;
tax	0:66300c77c6e9	648	u32_t iss;
tax	0:66300c77c6e9	649
tax	0:66300c77c6e9	650	LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
tax	0:66300c77c6e9	651
tax	0:66300c77c6e9	652	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
tax	0:66300c77c6e9	653	if (ipaddr != NULL) {
tax	0:66300c77c6e9	654	pcb->remote_ip = *ipaddr;
tax	0:66300c77c6e9	655	} else {
tax	0:66300c77c6e9	656	return ERR_VAL;
tax	0:66300c77c6e9	657	}
tax	0:66300c77c6e9	658	pcb->remote_port = port;
tax	0:66300c77c6e9	659
tax	0:66300c77c6e9	660	/* check if we have a route to the remote host */
tax	0:66300c77c6e9	661	if (ip_addr_isany(&(pcb->local_ip))) {
tax	0:66300c77c6e9	662	/* no local IP address set, yet. */
tax	0:66300c77c6e9	663	struct netif *netif = ip_route(&(pcb->remote_ip));
tax	0:66300c77c6e9	664	if (netif == NULL) {
tax	0:66300c77c6e9	665	/* Don't even try to send a SYN packet if we have no route
tax	0:66300c77c6e9	666	since that will fail. */
tax	0:66300c77c6e9	667	return ERR_RTE;
tax	0:66300c77c6e9	668	}
tax	0:66300c77c6e9	669	/* Use the netif's IP address as local address. */
tax	0:66300c77c6e9	670	ip_addr_copy(pcb->local_ip, netif->ip_addr);
tax	0:66300c77c6e9	671	}
tax	0:66300c77c6e9	672
tax	0:66300c77c6e9	673	if (pcb->local_port == 0) {
tax	0:66300c77c6e9	674	pcb->local_port = tcp_new_port();
tax	0:66300c77c6e9	675	}
tax	0:66300c77c6e9	676	#if SO_REUSE
tax	0:66300c77c6e9	677	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
tax	0:66300c77c6e9	678	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
tax	0:66300c77c6e9	679	now that the 5-tuple is unique. */
tax	0:66300c77c6e9	680	struct tcp_pcb *cpcb;
tax	0:66300c77c6e9	681	int i;
tax	0:66300c77c6e9	682	/* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
tax	0:66300c77c6e9	683	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
tax	0:66300c77c6e9	684	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
tax	0:66300c77c6e9	685	if ((cpcb->local_port == pcb->local_port) &&
tax	0:66300c77c6e9	686	(cpcb->remote_port == port) &&
tax	0:66300c77c6e9	687	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
tax	0:66300c77c6e9	688	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
tax	0:66300c77c6e9	689	/* linux returns EISCONN here, but ERR_USE should be OK for us */
tax	0:66300c77c6e9	690	return ERR_USE;
tax	0:66300c77c6e9	691	}
tax	0:66300c77c6e9	692	}
tax	0:66300c77c6e9	693	}
tax	0:66300c77c6e9	694	}
tax	0:66300c77c6e9	695	#endif /* SO_REUSE */
tax	0:66300c77c6e9	696	iss = tcp_next_iss();
tax	0:66300c77c6e9	697	pcb->rcv_nxt = 0;
tax	0:66300c77c6e9	698	pcb->snd_nxt = iss;
tax	0:66300c77c6e9	699	pcb->lastack = iss - 1;
tax	0:66300c77c6e9	700	pcb->snd_lbb = iss - 1;
tax	0:66300c77c6e9	701	pcb->rcv_wnd = TCP_WND;
tax	0:66300c77c6e9	702	pcb->rcv_ann_wnd = TCP_WND;
tax	0:66300c77c6e9	703	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
tax	0:66300c77c6e9	704	pcb->snd_wnd = TCP_WND;
tax	0:66300c77c6e9	705	/* As initial send MSS, we use TCP_MSS but limit it to 536.
tax	0:66300c77c6e9	706	The send MSS is updated when an MSS option is received. */
tax	0:66300c77c6e9	707	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
tax	0:66300c77c6e9	708	#if TCP_CALCULATE_EFF_SEND_MSS
tax	0:66300c77c6e9	709	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
tax	0:66300c77c6e9	710	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
tax	0:66300c77c6e9	711	pcb->cwnd = 1;
tax	0:66300c77c6e9	712	pcb->ssthresh = pcb->mss * 10;
tax	0:66300c77c6e9	713	#if LWIP_CALLBACK_API
tax	0:66300c77c6e9	714	pcb->connected = connected;
tax	0:66300c77c6e9	715	#else /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	716	LWIP_UNUSED_ARG(connected);
tax	0:66300c77c6e9	717	#endif /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	718
tax	0:66300c77c6e9	719	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
tax	0:66300c77c6e9	720
tax	0:66300c77c6e9	721	/* Send a SYN together with the MSS option. */
tax	0:66300c77c6e9	722	ret = tcp_enqueue_flags(pcb, TCP_SYN);
tax	0:66300c77c6e9	723	if (ret == ERR_OK) {
tax	0:66300c77c6e9	724	/* SYN segment was enqueued, changed the pcbs state now */
tax	0:66300c77c6e9	725	pcb->state = SYN_SENT;
tax	0:66300c77c6e9	726	TCP_RMV(&tcp_bound_pcbs, pcb);
tax	0:66300c77c6e9	727	TCP_REG(&tcp_active_pcbs, pcb);
tax	0:66300c77c6e9	728	snmp_inc_tcpactiveopens();
tax	0:66300c77c6e9	729
tax	0:66300c77c6e9	730	tcp_output(pcb);
tax	0:66300c77c6e9	731	}
tax	0:66300c77c6e9	732	return ret;
tax	0:66300c77c6e9	733	}
tax	0:66300c77c6e9	734
tax	0:66300c77c6e9	735	/**
tax	0:66300c77c6e9	736	* Called every 500 ms and implements the retransmission timer and the timer that
tax	0:66300c77c6e9	737	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
tax	0:66300c77c6e9	738	* various timers such as the inactivity timer in each PCB.
tax	0:66300c77c6e9	739	*
tax	0:66300c77c6e9	740	* Automatically called from tcp_tmr().
tax	0:66300c77c6e9	741	*/
tax	0:66300c77c6e9	742	void
tax	0:66300c77c6e9	743	tcp_slowtmr(void)
tax	0:66300c77c6e9	744	{
tax	0:66300c77c6e9	745	struct tcp_pcb pcb, pcb2, *prev;
tax	0:66300c77c6e9	746	u16_t eff_wnd;
tax	0:66300c77c6e9	747	u8_t pcb_remove; /* flag if a PCB should be removed */
tax	0:66300c77c6e9	748	u8_t pcb_reset; /* flag if a RST should be sent when removing */
tax	0:66300c77c6e9	749	err_t err;
tax	0:66300c77c6e9	750
tax	0:66300c77c6e9	751	tcp_debug_print_pcbs(); //DG
tax	0:66300c77c6e9	752
tax	0:66300c77c6e9	753	err = ERR_OK;
tax	0:66300c77c6e9	754
tax	0:66300c77c6e9	755	++tcp_ticks;
tax	0:66300c77c6e9	756	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
tax	0:66300c77c6e9	757
tax	0:66300c77c6e9	758	/* Steps through all of the active PCBs. */
tax	0:66300c77c6e9	759	prev = NULL;
tax	0:66300c77c6e9	760	pcb = tcp_active_pcbs;
tax	0:66300c77c6e9	761	if (pcb == NULL) {
tax	0:66300c77c6e9	762	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
tax	0:66300c77c6e9	763	}
tax	0:66300c77c6e9	764	while (pcb != NULL) {
tax	0:66300c77c6e9	765	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
tax	0:66300c77c6e9	766	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
tax	0:66300c77c6e9	767	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
tax	0:66300c77c6e9	768	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
tax	0:66300c77c6e9	769
tax	0:66300c77c6e9	770	pcb_remove = 0;
tax	0:66300c77c6e9	771	pcb_reset = 0;
tax	0:66300c77c6e9	772
tax	0:66300c77c6e9	773	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
tax	0:66300c77c6e9	774	++pcb_remove;
tax	0:66300c77c6e9	775	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
tax	0:66300c77c6e9	776	}
tax	0:66300c77c6e9	777	else if (pcb->nrtx == TCP_MAXRTX) {
tax	0:66300c77c6e9	778	++pcb_remove;
tax	0:66300c77c6e9	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
tax	0:66300c77c6e9	780	} else {
tax	0:66300c77c6e9	781	if (pcb->persist_backoff > 0) {
tax	0:66300c77c6e9	782	/* If snd_wnd is zero, use persist timer to send 1 byte probes
tax	0:66300c77c6e9	783	* instead of using the standard retransmission mechanism. */
tax	0:66300c77c6e9	784	pcb->persist_cnt++;
tax	0:66300c77c6e9	785	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
tax	0:66300c77c6e9	786	pcb->persist_cnt = 0;
tax	0:66300c77c6e9	787	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
tax	0:66300c77c6e9	788	pcb->persist_backoff++;
tax	0:66300c77c6e9	789	}
tax	0:66300c77c6e9	790	tcp_zero_window_probe(pcb);
tax	0:66300c77c6e9	791	}
tax	0:66300c77c6e9	792	} else {
tax	0:66300c77c6e9	793	/* Increase the retransmission timer if it is running */
tax	0:66300c77c6e9	794	if(pcb->rtime >= 0)
tax	0:66300c77c6e9	795	++pcb->rtime;
tax	0:66300c77c6e9	796
tax	0:66300c77c6e9	797	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
tax	0:66300c77c6e9	798	/* Time for a retransmission. */
tax	0:66300c77c6e9	799	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
tax	0:66300c77c6e9	800	" pcb->rto %"S16_F"\n",
tax	0:66300c77c6e9	801	pcb->rtime, pcb->rto));
tax	0:66300c77c6e9	802
tax	0:66300c77c6e9	803	/* Double retransmission time-out unless we are trying to
tax	0:66300c77c6e9	804	* connect to somebody (i.e., we are in SYN_SENT). */
tax	0:66300c77c6e9	805	if (pcb->state != SYN_SENT) {
tax	0:66300c77c6e9	806	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
tax	0:66300c77c6e9	807	}
tax	0:66300c77c6e9	808
tax	0:66300c77c6e9	809	/* Reset the retransmission timer. */
tax	0:66300c77c6e9	810	pcb->rtime = 0;
tax	0:66300c77c6e9	811
tax	0:66300c77c6e9	812	/* Reduce congestion window and ssthresh. */
tax	0:66300c77c6e9	813	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
tax	0:66300c77c6e9	814	pcb->ssthresh = eff_wnd >> 1;
tax	0:66300c77c6e9	815	if (pcb->ssthresh < (pcb->mss << 1)) {
tax	0:66300c77c6e9	816	pcb->ssthresh = (pcb->mss << 1);
tax	0:66300c77c6e9	817	}
tax	0:66300c77c6e9	818	pcb->cwnd = pcb->mss;
tax	0:66300c77c6e9	819	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
tax	0:66300c77c6e9	820	" ssthresh %"U16_F"\n",
tax	0:66300c77c6e9	821	pcb->cwnd, pcb->ssthresh));
tax	0:66300c77c6e9	822
tax	0:66300c77c6e9	823	/* The following needs to be called AFTER cwnd is set to one
tax	0:66300c77c6e9	824	mss - STJ */
tax	0:66300c77c6e9	825	tcp_rexmit_rto(pcb);
tax	0:66300c77c6e9	826	}
tax	0:66300c77c6e9	827	}
tax	0:66300c77c6e9	828	}
tax	0:66300c77c6e9	829	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
tax	0:66300c77c6e9	830	if (pcb->state == FIN_WAIT_2) {
tax	0:66300c77c6e9	831	if ((u32_t)(tcp_ticks - pcb->tmr) >
tax	0:66300c77c6e9	832	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
tax	0:66300c77c6e9	833	++pcb_remove;
tax	0:66300c77c6e9	834	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
tax	0:66300c77c6e9	835	}
tax	0:66300c77c6e9	836	}
tax	0:66300c77c6e9	837
tax	0:66300c77c6e9	838	/* Check if KEEPALIVE should be sent */
tax	0:66300c77c6e9	839	if((pcb->so_options & SOF_KEEPALIVE) &&
tax	0:66300c77c6e9	840	((pcb->state == ESTABLISHED) \|\|
tax	0:66300c77c6e9	841	(pcb->state == CLOSE_WAIT))) {
tax	0:66300c77c6e9	842	#if LWIP_TCP_KEEPALIVE
tax	0:66300c77c6e9	843	if((u32_t)(tcp_ticks - pcb->tmr) >
tax	0:66300c77c6e9	844	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
tax	0:66300c77c6e9	845	/ TCP_SLOW_INTERVAL)
tax	0:66300c77c6e9	846	#else
tax	0:66300c77c6e9	847	if((u32_t)(tcp_ticks - pcb->tmr) >
tax	0:66300c77c6e9	848	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
tax	0:66300c77c6e9	849	#endif /* LWIP_TCP_KEEPALIVE */
tax	0:66300c77c6e9	850	{
tax	0:66300c77c6e9	851	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
tax	0:66300c77c6e9	852	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
tax	0:66300c77c6e9	853	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
tax	0:66300c77c6e9	854
tax	0:66300c77c6e9	855	++pcb_remove;
tax	0:66300c77c6e9	856	++pcb_reset;
tax	0:66300c77c6e9	857	}
tax	0:66300c77c6e9	858	#if LWIP_TCP_KEEPALIVE
tax	0:66300c77c6e9	859	else if((u32_t)(tcp_ticks - pcb->tmr) >
tax	0:66300c77c6e9	860	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
tax	0:66300c77c6e9	861	/ TCP_SLOW_INTERVAL)
tax	0:66300c77c6e9	862	#else
tax	0:66300c77c6e9	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
tax	0:66300c77c6e9	864	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
tax	0:66300c77c6e9	865	/ TCP_SLOW_INTERVAL)
tax	0:66300c77c6e9	866	#endif /* LWIP_TCP_KEEPALIVE */
tax	0:66300c77c6e9	867	{
tax	0:66300c77c6e9	868	tcp_keepalive(pcb);
tax	0:66300c77c6e9	869	pcb->keep_cnt_sent++;
tax	0:66300c77c6e9	870	}
tax	0:66300c77c6e9	871	}
tax	0:66300c77c6e9	872
tax	0:66300c77c6e9	873	/* If this PCB has queued out of sequence data, but has been
tax	0:66300c77c6e9	874	inactive for too long, will drop the data (it will eventually
tax	0:66300c77c6e9	875	be retransmitted). */
tax	0:66300c77c6e9	876	#if TCP_QUEUE_OOSEQ
tax	0:66300c77c6e9	877	if (pcb->ooseq != NULL &&
tax	0:66300c77c6e9	878	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
tax	0:66300c77c6e9	879	tcp_segs_free(pcb->ooseq);
tax	0:66300c77c6e9	880	pcb->ooseq = NULL;
tax	0:66300c77c6e9	881	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
tax	0:66300c77c6e9	882	}
tax	0:66300c77c6e9	883	#endif /* TCP_QUEUE_OOSEQ */
tax	0:66300c77c6e9	884
tax	0:66300c77c6e9	885	/* Check if this PCB has stayed too long in SYN-RCVD */
tax	0:66300c77c6e9	886	if (pcb->state == SYN_RCVD) {
tax	0:66300c77c6e9	887	if ((u32_t)(tcp_ticks - pcb->tmr) >
tax	0:66300c77c6e9	888	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
tax	0:66300c77c6e9	889	++pcb_remove;
tax	0:66300c77c6e9	890	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
tax	0:66300c77c6e9	891	}
tax	0:66300c77c6e9	892	}
tax	0:66300c77c6e9	893
tax	0:66300c77c6e9	894	/* Check if this PCB has stayed too long in LAST-ACK */
tax	0:66300c77c6e9	895	if (pcb->state == LAST_ACK) {
tax	0:66300c77c6e9	896	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
tax	0:66300c77c6e9	897	++pcb_remove;
tax	0:66300c77c6e9	898	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
tax	0:66300c77c6e9	899	}
tax	0:66300c77c6e9	900	}
tax	0:66300c77c6e9	901
tax	0:66300c77c6e9	902	/* If the PCB should be removed, do it. */
tax	0:66300c77c6e9	903	if (pcb_remove) {
tax	0:66300c77c6e9	904	tcp_pcb_purge(pcb);
tax	0:66300c77c6e9	905	/* Remove PCB from tcp_active_pcbs list. */
tax	0:66300c77c6e9	906	if (prev != NULL) {
tax	0:66300c77c6e9	907	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
tax	0:66300c77c6e9	908	prev->next = pcb->next;
tax	0:66300c77c6e9	909	} else {
tax	0:66300c77c6e9	910	/* This PCB was the first. */
tax	0:66300c77c6e9	911	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
tax	0:66300c77c6e9	912	tcp_active_pcbs = pcb->next;
tax	0:66300c77c6e9	913	}
tax	0:66300c77c6e9	914
tax	0:66300c77c6e9	915	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
tax	0:66300c77c6e9	916	if (pcb_reset) {
tax	0:66300c77c6e9	917	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
tax	0:66300c77c6e9	918	pcb->local_port, pcb->remote_port);
tax	0:66300c77c6e9	919	}
tax	0:66300c77c6e9	920
tax	0:66300c77c6e9	921	pcb2 = pcb->next;
tax	0:66300c77c6e9	922	memp_free(MEMP_TCP_PCB, pcb);
tax	0:66300c77c6e9	923	pcb = pcb2;
tax	0:66300c77c6e9	924	} else {
tax	0:66300c77c6e9	925	/* get the 'next' element now and work with 'prev' below (in case of abort) */
tax	0:66300c77c6e9	926	prev = pcb;
tax	0:66300c77c6e9	927	pcb = pcb->next;
tax	0:66300c77c6e9	928
tax	0:66300c77c6e9	929	/* We check if we should poll the connection. */
tax	0:66300c77c6e9	930	++prev->polltmr;
tax	0:66300c77c6e9	931	if (prev->polltmr >= prev->pollinterval) {
tax	0:66300c77c6e9	932	prev->polltmr = 0;
tax	0:66300c77c6e9	933	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
tax	0:66300c77c6e9	934	TCP_EVENT_POLL(prev, err);
tax	0:66300c77c6e9	935	/* if err == ERR_ABRT, 'prev' is already deallocated */
tax	0:66300c77c6e9	936	if (err == ERR_OK) {
tax	0:66300c77c6e9	937	tcp_output(prev);
tax	0:66300c77c6e9	938	}
tax	0:66300c77c6e9	939	}
tax	0:66300c77c6e9	940	}
tax	0:66300c77c6e9	941	}
tax	0:66300c77c6e9	942
tax	0:66300c77c6e9	943
tax	0:66300c77c6e9	944	/* Steps through all of the TIME-WAIT PCBs. */
tax	0:66300c77c6e9	945	prev = NULL;
tax	0:66300c77c6e9	946	pcb = tcp_tw_pcbs;
tax	0:66300c77c6e9	947	while (pcb != NULL) {
tax	0:66300c77c6e9	948	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
tax	0:66300c77c6e9	949	pcb_remove = 0;
tax	0:66300c77c6e9	950
tax	0:66300c77c6e9	951	/* Check if this PCB has stayed long enough in TIME-WAIT */
tax	0:66300c77c6e9	952	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
tax	0:66300c77c6e9	953	++pcb_remove;
tax	0:66300c77c6e9	954	}
tax	0:66300c77c6e9	955
tax	0:66300c77c6e9	956
tax	0:66300c77c6e9	957
tax	0:66300c77c6e9	958	/* If the PCB should be removed, do it. */
tax	0:66300c77c6e9	959	if (pcb_remove) {
tax	0:66300c77c6e9	960	tcp_pcb_purge(pcb);
tax	0:66300c77c6e9	961	/* Remove PCB from tcp_tw_pcbs list. */
tax	0:66300c77c6e9	962	if (prev != NULL) {
tax	0:66300c77c6e9	963	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
tax	0:66300c77c6e9	964	prev->next = pcb->next;
tax	0:66300c77c6e9	965	} else {
tax	0:66300c77c6e9	966	/* This PCB was the first. */
tax	0:66300c77c6e9	967	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
tax	0:66300c77c6e9	968	tcp_tw_pcbs = pcb->next;
tax	0:66300c77c6e9	969	}
tax	0:66300c77c6e9	970	pcb2 = pcb->next;
tax	0:66300c77c6e9	971	memp_free(MEMP_TCP_PCB, pcb);
tax	0:66300c77c6e9	972	pcb = pcb2;
tax	0:66300c77c6e9	973	} else {
tax	0:66300c77c6e9	974	prev = pcb;
tax	0:66300c77c6e9	975	pcb = pcb->next;
tax	0:66300c77c6e9	976	}
tax	0:66300c77c6e9	977	}
tax	0:66300c77c6e9	978	}
tax	0:66300c77c6e9	979
tax	0:66300c77c6e9	980	/**
tax	0:66300c77c6e9	981	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
tax	0:66300c77c6e9	982	* "refused" by upper layer (application) and sends delayed ACKs.
tax	0:66300c77c6e9	983	*
tax	0:66300c77c6e9	984	* Automatically called from tcp_tmr().
tax	0:66300c77c6e9	985	*/
tax	0:66300c77c6e9	986	void
tax	0:66300c77c6e9	987	tcp_fasttmr(void)
tax	0:66300c77c6e9	988	{
tax	0:66300c77c6e9	989	struct tcp_pcb *pcb = tcp_active_pcbs;
tax	0:66300c77c6e9	990
tax	0:66300c77c6e9	991	while(pcb != NULL) {
tax	0:66300c77c6e9	992	struct tcp_pcb *next = pcb->next;
tax	0:66300c77c6e9	993	/* If there is data which was previously "refused" by upper layer */
tax	0:66300c77c6e9	994	if (pcb->refused_data != NULL) {
tax	0:66300c77c6e9	995	/* Notify again application with data previously received. */
tax	0:66300c77c6e9	996	err_t err;
tax	0:66300c77c6e9	997	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
tax	0:66300c77c6e9	998	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
tax	0:66300c77c6e9	999	if (err == ERR_OK) {
tax	0:66300c77c6e9	1000	pcb->refused_data = NULL;
tax	0:66300c77c6e9	1001	} else if (err == ERR_ABRT) {
tax	0:66300c77c6e9	1002	/* if err == ERR_ABRT, 'pcb' is already deallocated */
tax	0:66300c77c6e9	1003	pcb = NULL;
tax	0:66300c77c6e9	1004	}
tax	0:66300c77c6e9	1005	}
tax	0:66300c77c6e9	1006
tax	0:66300c77c6e9	1007	/* send delayed ACKs */
tax	0:66300c77c6e9	1008	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
tax	0:66300c77c6e9	1009	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
tax	0:66300c77c6e9	1010	tcp_ack_now(pcb);
tax	0:66300c77c6e9	1011	tcp_output(pcb);
tax	0:66300c77c6e9	1012	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
tax	0:66300c77c6e9	1013	}
tax	0:66300c77c6e9	1014
tax	0:66300c77c6e9	1015	pcb = next;
tax	0:66300c77c6e9	1016	}
tax	0:66300c77c6e9	1017	}
tax	0:66300c77c6e9	1018
tax	0:66300c77c6e9	1019	/**
tax	0:66300c77c6e9	1020	* Deallocates a list of TCP segments (tcp_seg structures).
tax	0:66300c77c6e9	1021	*
tax	0:66300c77c6e9	1022	* @param seg tcp_seg list of TCP segments to free
tax	0:66300c77c6e9	1023	*/
tax	0:66300c77c6e9	1024	void
tax	0:66300c77c6e9	1025	tcp_segs_free(struct tcp_seg *seg)
tax	0:66300c77c6e9	1026	{
tax	0:66300c77c6e9	1027	while (seg != NULL) {
tax	0:66300c77c6e9	1028	struct tcp_seg *next = seg->next;
tax	0:66300c77c6e9	1029	tcp_seg_free(seg);
tax	0:66300c77c6e9	1030	seg = next;
tax	0:66300c77c6e9	1031	}
tax	0:66300c77c6e9	1032	}
tax	0:66300c77c6e9	1033
tax	0:66300c77c6e9	1034	/**
tax	0:66300c77c6e9	1035	* Frees a TCP segment (tcp_seg structure).
tax	0:66300c77c6e9	1036	*
tax	0:66300c77c6e9	1037	* @param seg single tcp_seg to free
tax	0:66300c77c6e9	1038	*/
tax	0:66300c77c6e9	1039	void
tax	0:66300c77c6e9	1040	tcp_seg_free(struct tcp_seg *seg)
tax	0:66300c77c6e9	1041	{
tax	0:66300c77c6e9	1042	if (seg != NULL) {
tax	0:66300c77c6e9	1043	if (seg->p != NULL) {
tax	0:66300c77c6e9	1044	pbuf_free(seg->p);
tax	0:66300c77c6e9	1045	#if TCP_DEBUG
tax	0:66300c77c6e9	1046	seg->p = NULL;
tax	0:66300c77c6e9	1047	#endif /* TCP_DEBUG */
tax	0:66300c77c6e9	1048	}
tax	0:66300c77c6e9	1049	memp_free(MEMP_TCP_SEG, seg);
tax	0:66300c77c6e9	1050	}
tax	0:66300c77c6e9	1051	}
tax	0:66300c77c6e9	1052
tax	0:66300c77c6e9	1053	/**
tax	0:66300c77c6e9	1054	* Sets the priority of a connection.
tax	0:66300c77c6e9	1055	*
tax	0:66300c77c6e9	1056	* @param pcb the tcp_pcb to manipulate
tax	0:66300c77c6e9	1057	* @param prio new priority
tax	0:66300c77c6e9	1058	*/
tax	0:66300c77c6e9	1059	void
tax	0:66300c77c6e9	1060	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
tax	0:66300c77c6e9	1061	{
tax	0:66300c77c6e9	1062	pcb->prio = prio;
tax	0:66300c77c6e9	1063	}
tax	0:66300c77c6e9	1064
tax	0:66300c77c6e9	1065	#if TCP_QUEUE_OOSEQ
tax	0:66300c77c6e9	1066	/**
tax	0:66300c77c6e9	1067	* Returns a copy of the given TCP segment.
tax	0:66300c77c6e9	1068	* The pbuf and data are not copied, only the pointers
tax	0:66300c77c6e9	1069	*
tax	0:66300c77c6e9	1070	* @param seg the old tcp_seg
tax	0:66300c77c6e9	1071	* @return a copy of seg
tax	0:66300c77c6e9	1072	*/
tax	0:66300c77c6e9	1073	struct tcp_seg *
tax	0:66300c77c6e9	1074	tcp_seg_copy(struct tcp_seg *seg)
tax	0:66300c77c6e9	1075	{
tax	0:66300c77c6e9	1076	struct tcp_seg *cseg;
tax	0:66300c77c6e9	1077
tax	0:66300c77c6e9	1078	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
tax	0:66300c77c6e9	1079	if (cseg == NULL) {
tax	0:66300c77c6e9	1080	return NULL;
tax	0:66300c77c6e9	1081	}
tax	0:66300c77c6e9	1082	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
tax	0:66300c77c6e9	1083	pbuf_ref(cseg->p);
tax	0:66300c77c6e9	1084	return cseg;
tax	0:66300c77c6e9	1085	}
tax	0:66300c77c6e9	1086	#endif /* TCP_QUEUE_OOSEQ */
tax	0:66300c77c6e9	1087
tax	0:66300c77c6e9	1088	#if LWIP_CALLBACK_API
tax	0:66300c77c6e9	1089	/**
tax	0:66300c77c6e9	1090	* Default receive callback that is called if the user didn't register
tax	0:66300c77c6e9	1091	* a recv callback for the pcb.
tax	0:66300c77c6e9	1092	*/
tax	0:66300c77c6e9	1093	err_t
tax	0:66300c77c6e9	1094	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
tax	0:66300c77c6e9	1095	{
tax	0:66300c77c6e9	1096	LWIP_UNUSED_ARG(arg);
tax	0:66300c77c6e9	1097	if (p != NULL) {
tax	0:66300c77c6e9	1098	tcp_recved(pcb, p->tot_len);
tax	0:66300c77c6e9	1099	pbuf_free(p);
tax	0:66300c77c6e9	1100	} else if (err == ERR_OK) {
tax	0:66300c77c6e9	1101	return tcp_close(pcb);
tax	0:66300c77c6e9	1102	}
tax	0:66300c77c6e9	1103	return ERR_OK;
tax	0:66300c77c6e9	1104	}
tax	0:66300c77c6e9	1105	#endif /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	1106
tax	0:66300c77c6e9	1107	/**
tax	0:66300c77c6e9	1108	* Kills the oldest active connection that has lower priority than prio.
tax	0:66300c77c6e9	1109	*
tax	0:66300c77c6e9	1110	* @param prio minimum priority
tax	0:66300c77c6e9	1111	*/
tax	0:66300c77c6e9	1112	static void
tax	0:66300c77c6e9	1113	tcp_kill_prio(u8_t prio)
tax	0:66300c77c6e9	1114	{
tax	0:66300c77c6e9	1115	struct tcp_pcb pcb, inactive;
tax	0:66300c77c6e9	1116	u32_t inactivity;
tax	0:66300c77c6e9	1117	u8_t mprio;
tax	0:66300c77c6e9	1118
tax	0:66300c77c6e9	1119
tax	0:66300c77c6e9	1120	mprio = TCP_PRIO_MAX;
tax	0:66300c77c6e9	1121
tax	0:66300c77c6e9	1122	/* We kill the oldest active connection that has lower priority than prio. */
tax	0:66300c77c6e9	1123	inactivity = 0;
tax	0:66300c77c6e9	1124	inactive = NULL;
tax	0:66300c77c6e9	1125	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
tax	0:66300c77c6e9	1126	if (pcb->prio <= prio &&
tax	0:66300c77c6e9	1127	pcb->prio <= mprio &&
tax	0:66300c77c6e9	1128	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
tax	0:66300c77c6e9	1129	inactivity = tcp_ticks - pcb->tmr;
tax	0:66300c77c6e9	1130	inactive = pcb;
tax	0:66300c77c6e9	1131	mprio = pcb->prio;
tax	0:66300c77c6e9	1132	}
tax	0:66300c77c6e9	1133	}
tax	0:66300c77c6e9	1134	if (inactive != NULL) {
tax	0:66300c77c6e9	1135	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
tax	0:66300c77c6e9	1136	(void *)inactive, inactivity));
tax	0:66300c77c6e9	1137	tcp_abort(inactive);
tax	0:66300c77c6e9	1138	}
tax	0:66300c77c6e9	1139	}
tax	0:66300c77c6e9	1140
tax	0:66300c77c6e9	1141	/**
tax	0:66300c77c6e9	1142	* Kills the oldest connection that is in TIME_WAIT state.
tax	0:66300c77c6e9	1143	* Called from tcp_alloc() if no more connections are available.
tax	0:66300c77c6e9	1144	*/
tax	0:66300c77c6e9	1145	static void
tax	0:66300c77c6e9	1146	tcp_kill_timewait(void)
tax	0:66300c77c6e9	1147	{
tax	0:66300c77c6e9	1148	struct tcp_pcb pcb, inactive;
tax	0:66300c77c6e9	1149	u32_t inactivity;
tax	0:66300c77c6e9	1150
tax	0:66300c77c6e9	1151	inactivity = 0;
tax	0:66300c77c6e9	1152	inactive = NULL;
tax	0:66300c77c6e9	1153	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
tax	0:66300c77c6e9	1154	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
tax	0:66300c77c6e9	1155	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
tax	0:66300c77c6e9	1156	inactivity = tcp_ticks - pcb->tmr;
tax	0:66300c77c6e9	1157	inactive = pcb;
tax	0:66300c77c6e9	1158	}
tax	0:66300c77c6e9	1159	}
tax	0:66300c77c6e9	1160	if (inactive != NULL) {
tax	0:66300c77c6e9	1161	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
tax	0:66300c77c6e9	1162	(void *)inactive, inactivity));
tax	0:66300c77c6e9	1163	tcp_abort(inactive);
tax	0:66300c77c6e9	1164	}
tax	0:66300c77c6e9	1165	}
tax	0:66300c77c6e9	1166
tax	0:66300c77c6e9	1167	/**
tax	0:66300c77c6e9	1168	* Allocate a new tcp_pcb structure.
tax	0:66300c77c6e9	1169	*
tax	0:66300c77c6e9	1170	* @param prio priority for the new pcb
tax	0:66300c77c6e9	1171	* @return a new tcp_pcb that initially is in state CLOSED
tax	0:66300c77c6e9	1172	*/
tax	0:66300c77c6e9	1173	struct tcp_pcb *
tax	0:66300c77c6e9	1174	tcp_alloc(u8_t prio)
tax	0:66300c77c6e9	1175	{
tax	0:66300c77c6e9	1176	struct tcp_pcb *pcb;
tax	0:66300c77c6e9	1177	u32_t iss;
tax	0:66300c77c6e9	1178
tax	0:66300c77c6e9	1179	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
tax	0:66300c77c6e9	1180	if (pcb == NULL) {
tax	0:66300c77c6e9	1181	/* Try killing oldest connection in TIME-WAIT. */
tax	0:66300c77c6e9	1182	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
tax	0:66300c77c6e9	1183	tcp_kill_timewait();
tax	0:66300c77c6e9	1184	/* Try to allocate a tcp_pcb again. */
tax	0:66300c77c6e9	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
tax	0:66300c77c6e9	1186	if (pcb == NULL) {
tax	0:66300c77c6e9	1187	/* Try killing active connections with lower priority than the new one. */
tax	0:66300c77c6e9	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
tax	0:66300c77c6e9	1189	tcp_kill_prio(prio);
tax	0:66300c77c6e9	1190	/* Try to allocate a tcp_pcb again. */
tax	0:66300c77c6e9	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
tax	0:66300c77c6e9	1192	if (pcb != NULL) {
tax	0:66300c77c6e9	1193	/* adjust err stats: memp_malloc failed twice before */
tax	0:66300c77c6e9	1194	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
tax	0:66300c77c6e9	1195	}
tax	0:66300c77c6e9	1196	}
tax	0:66300c77c6e9	1197	if (pcb != NULL) {
tax	0:66300c77c6e9	1198	/* adjust err stats: timewait PCB was freed above */
tax	0:66300c77c6e9	1199	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
tax	0:66300c77c6e9	1200	}
tax	0:66300c77c6e9	1201	}
tax	0:66300c77c6e9	1202	if (pcb != NULL) {
tax	0:66300c77c6e9	1203	memset(pcb, 0, sizeof(struct tcp_pcb));
tax	0:66300c77c6e9	1204	pcb->prio = prio;
tax	0:66300c77c6e9	1205	pcb->snd_buf = TCP_SND_BUF;
tax	0:66300c77c6e9	1206	pcb->snd_queuelen = 0;
tax	0:66300c77c6e9	1207	pcb->rcv_wnd = TCP_WND;
tax	0:66300c77c6e9	1208	pcb->rcv_ann_wnd = TCP_WND;
tax	0:66300c77c6e9	1209	pcb->tos = 0;
tax	0:66300c77c6e9	1210	pcb->ttl = TCP_TTL;
tax	0:66300c77c6e9	1211	/* As initial send MSS, we use TCP_MSS but limit it to 536.
tax	0:66300c77c6e9	1212	The send MSS is updated when an MSS option is received. */
tax	0:66300c77c6e9	1213	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
tax	0:66300c77c6e9	1214	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
tax	0:66300c77c6e9	1215	pcb->sa = 0;
tax	0:66300c77c6e9	1216	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
tax	0:66300c77c6e9	1217	pcb->rtime = -1;
tax	0:66300c77c6e9	1218	pcb->cwnd = 1;
tax	0:66300c77c6e9	1219	iss = tcp_next_iss();
tax	0:66300c77c6e9	1220	pcb->snd_wl2 = iss;
tax	0:66300c77c6e9	1221	pcb->snd_nxt = iss;
tax	0:66300c77c6e9	1222	pcb->lastack = iss;
tax	0:66300c77c6e9	1223	pcb->snd_lbb = iss;
tax	0:66300c77c6e9	1224	pcb->tmr = tcp_ticks;
tax	0:66300c77c6e9	1225
tax	0:66300c77c6e9	1226	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
tax	0:66300c77c6e9	1227
tax	0:66300c77c6e9	1228	pcb->polltmr = 0;
tax	0:66300c77c6e9	1229
tax	0:66300c77c6e9	1230	#if LWIP_CALLBACK_API
tax	0:66300c77c6e9	1231	pcb->recv = tcp_recv_null;
tax	0:66300c77c6e9	1232	#endif /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	1233
tax	0:66300c77c6e9	1234	/* Init KEEPALIVE timer */
tax	0:66300c77c6e9	1235	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
tax	0:66300c77c6e9	1236
tax	0:66300c77c6e9	1237	#if LWIP_TCP_KEEPALIVE
tax	0:66300c77c6e9	1238	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
tax	0:66300c77c6e9	1239	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
tax	0:66300c77c6e9	1240	#endif /* LWIP_TCP_KEEPALIVE */
tax	0:66300c77c6e9	1241
tax	0:66300c77c6e9	1242	pcb->keep_cnt_sent = 0;
tax	0:66300c77c6e9	1243	}
tax	0:66300c77c6e9	1244	return pcb;
tax	0:66300c77c6e9	1245	}
tax	0:66300c77c6e9	1246
tax	0:66300c77c6e9	1247	/**
tax	0:66300c77c6e9	1248	* Creates a new TCP protocol control block but doesn't place it on
tax	0:66300c77c6e9	1249	* any of the TCP PCB lists.
tax	0:66300c77c6e9	1250	* The pcb is not put on any list until binding using tcp_bind().
tax	0:66300c77c6e9	1251	*
tax	0:66300c77c6e9	1252	* @internal: Maybe there should be a idle TCP PCB list where these
tax	0:66300c77c6e9	1253	* PCBs are put on. Port reservation using tcp_bind() is implemented but
tax	0:66300c77c6e9	1254	* allocated pcbs that are not bound can't be killed automatically if wanting
tax	0:66300c77c6e9	1255	* to allocate a pcb with higher prio (@see tcp_kill_prio())
tax	0:66300c77c6e9	1256	*
tax	0:66300c77c6e9	1257	* @return a new tcp_pcb that initially is in state CLOSED
tax	0:66300c77c6e9	1258	*/
tax	0:66300c77c6e9	1259	struct tcp_pcb *
tax	0:66300c77c6e9	1260	tcp_new(void)
tax	0:66300c77c6e9	1261	{
tax	0:66300c77c6e9	1262	return tcp_alloc(TCP_PRIO_NORMAL);
tax	0:66300c77c6e9	1263	}
tax	0:66300c77c6e9	1264
tax	0:66300c77c6e9	1265	/**
tax	0:66300c77c6e9	1266	* Used to specify the argument that should be passed callback
tax	0:66300c77c6e9	1267	* functions.
tax	0:66300c77c6e9	1268	*
tax	0:66300c77c6e9	1269	* @param pcb tcp_pcb to set the callback argument
tax	0:66300c77c6e9	1270	* @param arg void pointer argument to pass to callback functions
tax	0:66300c77c6e9	1271	*/
tax	0:66300c77c6e9	1272	void
tax	0:66300c77c6e9	1273	tcp_arg(struct tcp_pcb pcb, void arg)
tax	0:66300c77c6e9	1274	{
tax	0:66300c77c6e9	1275	pcb->callback_arg = arg;
tax	0:66300c77c6e9	1276	}
tax	0:66300c77c6e9	1277	#if LWIP_CALLBACK_API
tax	0:66300c77c6e9	1278
tax	0:66300c77c6e9	1279	/**
tax	0:66300c77c6e9	1280	* Used to specify the function that should be called when a TCP
tax	0:66300c77c6e9	1281	* connection receives data.
tax	0:66300c77c6e9	1282	*
tax	0:66300c77c6e9	1283	* @param pcb tcp_pcb to set the recv callback
tax	0:66300c77c6e9	1284	* @param recv callback function to call for this pcb when data is received
tax	0:66300c77c6e9	1285	*/
tax	0:66300c77c6e9	1286	void
tax	0:66300c77c6e9	1287	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
tax	0:66300c77c6e9	1288	{
tax	0:66300c77c6e9	1289	pcb->recv = recv;
tax	0:66300c77c6e9	1290	}
tax	0:66300c77c6e9	1291
tax	0:66300c77c6e9	1292	/**
tax	0:66300c77c6e9	1293	* Used to specify the function that should be called when TCP data
tax	0:66300c77c6e9	1294	* has been successfully delivered to the remote host.
tax	0:66300c77c6e9	1295	*
tax	0:66300c77c6e9	1296	* @param pcb tcp_pcb to set the sent callback
tax	0:66300c77c6e9	1297	* @param sent callback function to call for this pcb when data is successfully sent
tax	0:66300c77c6e9	1298	*/
tax	0:66300c77c6e9	1299	void
tax	0:66300c77c6e9	1300	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
tax	0:66300c77c6e9	1301	{
tax	0:66300c77c6e9	1302	pcb->sent = sent;
tax	0:66300c77c6e9	1303	}
tax	0:66300c77c6e9	1304
tax	0:66300c77c6e9	1305	/**
tax	0:66300c77c6e9	1306	* Used to specify the function that should be called when a fatal error
tax	0:66300c77c6e9	1307	* has occured on the connection.
tax	0:66300c77c6e9	1308	*
tax	0:66300c77c6e9	1309	* @param pcb tcp_pcb to set the err callback
tax	0:66300c77c6e9	1310	* @param err callback function to call for this pcb when a fatal error
tax	0:66300c77c6e9	1311	* has occured on the connection
tax	0:66300c77c6e9	1312	*/
tax	0:66300c77c6e9	1313	void
tax	0:66300c77c6e9	1314	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
tax	0:66300c77c6e9	1315	{
tax	0:66300c77c6e9	1316	pcb->errf = err;
tax	0:66300c77c6e9	1317	}
tax	0:66300c77c6e9	1318
tax	0:66300c77c6e9	1319	/**
tax	0:66300c77c6e9	1320	* Used for specifying the function that should be called when a
tax	0:66300c77c6e9	1321	* LISTENing connection has been connected to another host.
tax	0:66300c77c6e9	1322	*
tax	0:66300c77c6e9	1323	* @param pcb tcp_pcb to set the accept callback
tax	0:66300c77c6e9	1324	* @param accept callback function to call for this pcb when LISTENing
tax	0:66300c77c6e9	1325	* connection has been connected to another host
tax	0:66300c77c6e9	1326	*/
tax	0:66300c77c6e9	1327	void
tax	0:66300c77c6e9	1328	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
tax	0:66300c77c6e9	1329	{
tax	0:66300c77c6e9	1330	pcb->accept = accept;
tax	0:66300c77c6e9	1331	}
tax	0:66300c77c6e9	1332	#endif /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	1333
tax	0:66300c77c6e9	1334
tax	0:66300c77c6e9	1335	/**
tax	0:66300c77c6e9	1336	* Used to specify the function that should be called periodically
tax	0:66300c77c6e9	1337	* from TCP. The interval is specified in terms of the TCP coarse
tax	0:66300c77c6e9	1338	* timer interval, which is called twice a second.
tax	0:66300c77c6e9	1339	*
tax	0:66300c77c6e9	1340	*/
tax	0:66300c77c6e9	1341	void
tax	0:66300c77c6e9	1342	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
tax	0:66300c77c6e9	1343	{
tax	0:66300c77c6e9	1344	#if LWIP_CALLBACK_API
tax	0:66300c77c6e9	1345	pcb->poll = poll;
tax	0:66300c77c6e9	1346	#else /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	1347	LWIP_UNUSED_ARG(poll);
tax	0:66300c77c6e9	1348	#endif /* LWIP_CALLBACK_API */
tax	0:66300c77c6e9	1349	pcb->pollinterval = interval;
tax	0:66300c77c6e9	1350	}
tax	0:66300c77c6e9	1351
tax	0:66300c77c6e9	1352	/**
tax	0:66300c77c6e9	1353	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
tax	0:66300c77c6e9	1354	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
tax	0:66300c77c6e9	1355	*
tax	0:66300c77c6e9	1356	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
tax	0:66300c77c6e9	1357	*/
tax	0:66300c77c6e9	1358	void
tax	0:66300c77c6e9	1359	tcp_pcb_purge(struct tcp_pcb *pcb)
tax	0:66300c77c6e9	1360	{
tax	0:66300c77c6e9	1361	if (pcb->state != CLOSED &&
tax	0:66300c77c6e9	1362	pcb->state != TIME_WAIT &&
tax	0:66300c77c6e9	1363	pcb->state != LISTEN) {
tax	0:66300c77c6e9	1364
tax	0:66300c77c6e9	1365	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
tax	0:66300c77c6e9	1366
tax	0:66300c77c6e9	1367	#if TCP_LISTEN_BACKLOG
tax	0:66300c77c6e9	1368	if (pcb->state == SYN_RCVD) {
tax	0:66300c77c6e9	1369	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
tax	0:66300c77c6e9	1370	struct tcp_pcb_listen *lpcb;
tax	0:66300c77c6e9	1371	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
tax	0:66300c77c6e9	1372	tcp_listen_pcbs.listen_pcbs != NULL);
tax	0:66300c77c6e9	1373	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
tax	0:66300c77c6e9	1374	if ((lpcb->local_port == pcb->local_port) &&
tax	0:66300c77c6e9	1375	(ip_addr_isany(&lpcb->local_ip) \|\|
tax	0:66300c77c6e9	1376	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
tax	0:66300c77c6e9	1377	/* port and address of the listen pcb match the timed-out pcb */
tax	0:66300c77c6e9	1378	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
tax	0:66300c77c6e9	1379	lpcb->accepts_pending > 0);
tax	0:66300c77c6e9	1380	lpcb->accepts_pending--;
tax	0:66300c77c6e9	1381	break;
tax	0:66300c77c6e9	1382	}
tax	0:66300c77c6e9	1383	}
tax	0:66300c77c6e9	1384	}
tax	0:66300c77c6e9	1385	#endif /* TCP_LISTEN_BACKLOG */
tax	0:66300c77c6e9	1386
tax	0:66300c77c6e9	1387
tax	0:66300c77c6e9	1388	if (pcb->refused_data != NULL) {
tax	0:66300c77c6e9	1389	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
tax	0:66300c77c6e9	1390	pbuf_free(pcb->refused_data);
tax	0:66300c77c6e9	1391	pcb->refused_data = NULL;
tax	0:66300c77c6e9	1392	}
tax	0:66300c77c6e9	1393	if (pcb->unsent != NULL) {
tax	0:66300c77c6e9	1394	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
tax	0:66300c77c6e9	1395	}
tax	0:66300c77c6e9	1396	if (pcb->unacked != NULL) {
tax	0:66300c77c6e9	1397	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
tax	0:66300c77c6e9	1398	}
tax	0:66300c77c6e9	1399	#if TCP_QUEUE_OOSEQ
tax	0:66300c77c6e9	1400	if (pcb->ooseq != NULL) {
tax	0:66300c77c6e9	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
tax	0:66300c77c6e9	1402	}
tax	0:66300c77c6e9	1403	tcp_segs_free(pcb->ooseq);
tax	0:66300c77c6e9	1404	pcb->ooseq = NULL;
tax	0:66300c77c6e9	1405	#endif /* TCP_QUEUE_OOSEQ */
tax	0:66300c77c6e9	1406
tax	0:66300c77c6e9	1407	/* Stop the retransmission timer as it will expect data on unacked
tax	0:66300c77c6e9	1408	queue if it fires */
tax	0:66300c77c6e9	1409	pcb->rtime = -1;
tax	0:66300c77c6e9	1410
tax	0:66300c77c6e9	1411	tcp_segs_free(pcb->unsent);
tax	0:66300c77c6e9	1412	tcp_segs_free(pcb->unacked);
tax	0:66300c77c6e9	1413	pcb->unacked = pcb->unsent = NULL;
tax	0:66300c77c6e9	1414	#if TCP_OVERSIZE
tax	0:66300c77c6e9	1415	pcb->unsent_oversize = 0;
tax	0:66300c77c6e9	1416	#endif /* TCP_OVERSIZE */
tax	0:66300c77c6e9	1417	}
tax	0:66300c77c6e9	1418	}
tax	0:66300c77c6e9	1419
tax	0:66300c77c6e9	1420	/**
tax	0:66300c77c6e9	1421	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
tax	0:66300c77c6e9	1422	*
tax	0:66300c77c6e9	1423	* @param pcblist PCB list to purge.
tax	0:66300c77c6e9	1424	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
tax	0:66300c77c6e9	1425	*/
tax	0:66300c77c6e9	1426	void
tax	0:66300c77c6e9	1427	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
tax	0:66300c77c6e9	1428	{
tax	0:66300c77c6e9	1429	TCP_RMV(pcblist, pcb);
tax	0:66300c77c6e9	1430
tax	0:66300c77c6e9	1431	tcp_pcb_purge(pcb);
tax	0:66300c77c6e9	1432
tax	0:66300c77c6e9	1433	/* if there is an outstanding delayed ACKs, send it */
tax	0:66300c77c6e9	1434	if (pcb->state != TIME_WAIT &&
tax	0:66300c77c6e9	1435	pcb->state != LISTEN &&
tax	0:66300c77c6e9	1436	pcb->flags & TF_ACK_DELAY) {
tax	0:66300c77c6e9	1437	pcb->flags \|= TF_ACK_NOW;
tax	0:66300c77c6e9	1438	tcp_output(pcb);
tax	0:66300c77c6e9	1439	}
tax	0:66300c77c6e9	1440
tax	0:66300c77c6e9	1441	if (pcb->state != LISTEN) {
tax	0:66300c77c6e9	1442	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
tax	0:66300c77c6e9	1443	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
tax	0:66300c77c6e9	1444	#if TCP_QUEUE_OOSEQ
tax	0:66300c77c6e9	1445	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
tax	0:66300c77c6e9	1446	#endif /* TCP_QUEUE_OOSEQ */
tax	0:66300c77c6e9	1447	}
tax	0:66300c77c6e9	1448
tax	0:66300c77c6e9	1449	pcb->state = CLOSED;
tax	0:66300c77c6e9	1450
tax	0:66300c77c6e9	1451	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
tax	0:66300c77c6e9	1452	}
tax	0:66300c77c6e9	1453
tax	0:66300c77c6e9	1454	/**
tax	0:66300c77c6e9	1455	* Calculates a new initial sequence number for new connections.
tax	0:66300c77c6e9	1456	*
tax	0:66300c77c6e9	1457	* @return u32_t pseudo random sequence number
tax	0:66300c77c6e9	1458	*/
tax	0:66300c77c6e9	1459	u32_t
tax	0:66300c77c6e9	1460	tcp_next_iss(void)
tax	0:66300c77c6e9	1461	{
tax	0:66300c77c6e9	1462	static u32_t iss = 6510;
tax	0:66300c77c6e9	1463
tax	0:66300c77c6e9	1464	iss += tcp_ticks; /* XXX */
tax	0:66300c77c6e9	1465	return iss;
tax	0:66300c77c6e9	1466	}
tax	0:66300c77c6e9	1467
tax	0:66300c77c6e9	1468	#if TCP_CALCULATE_EFF_SEND_MSS
tax	0:66300c77c6e9	1469	/**
tax	0:66300c77c6e9	1470	* Calcluates the effective send mss that can be used for a specific IP address
tax	0:66300c77c6e9	1471	* by using ip_route to determin the netif used to send to the address and
tax	0:66300c77c6e9	1472	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
tax	0:66300c77c6e9	1473	*/
tax	0:66300c77c6e9	1474	u16_t
tax	0:66300c77c6e9	1475	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
tax	0:66300c77c6e9	1476	{
tax	0:66300c77c6e9	1477	u16_t mss_s;
tax	0:66300c77c6e9	1478	struct netif *outif;
tax	0:66300c77c6e9	1479
tax	0:66300c77c6e9	1480	outif = ip_route(addr);
tax	0:66300c77c6e9	1481	if ((outif != NULL) && (outif->mtu != 0)) {
tax	0:66300c77c6e9	1482	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
tax	0:66300c77c6e9	1483	/* RFC 1122, chap 4.2.2.6:
tax	0:66300c77c6e9	1484	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
tax	0:66300c77c6e9	1485	* We correct for TCP options in tcp_write(), and don't support IP options.
tax	0:66300c77c6e9	1486	*/
tax	0:66300c77c6e9	1487	sendmss = LWIP_MIN(sendmss, mss_s);
tax	0:66300c77c6e9	1488	}
tax	0:66300c77c6e9	1489	return sendmss;
tax	0:66300c77c6e9	1490	}
tax	0:66300c77c6e9	1491	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
tax	0:66300c77c6e9	1492
tax	0:66300c77c6e9	1493	const char*
tax	0:66300c77c6e9	1494	tcp_debug_state_str(enum tcp_state s)
tax	0:66300c77c6e9	1495	{
tax	0:66300c77c6e9	1496	return tcp_state_str[s];
tax	0:66300c77c6e9	1497	}
tax	0:66300c77c6e9	1498
tax	0:66300c77c6e9	1499	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
tax	0:66300c77c6e9	1500	/**
tax	0:66300c77c6e9	1501	* Print a tcp header for debugging purposes.
tax	0:66300c77c6e9	1502	*
tax	0:66300c77c6e9	1503	* @param tcphdr pointer to a struct tcp_hdr
tax	0:66300c77c6e9	1504	*/
tax	0:66300c77c6e9	1505	void
tax	0:66300c77c6e9	1506	tcp_debug_print(struct tcp_hdr *tcphdr)
tax	0:66300c77c6e9	1507	{
tax	0:66300c77c6e9	1508	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
tax	0:66300c77c6e9	1509	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	1510	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
tax	0:66300c77c6e9	1511	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
tax	0:66300c77c6e9	1512	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	1513	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
tax	0:66300c77c6e9	1514	ntohl(tcphdr->seqno)));
tax	0:66300c77c6e9	1515	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	1516	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
tax	0:66300c77c6e9	1517	ntohl(tcphdr->ackno)));
tax	0:66300c77c6e9	1518	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	1519	LWIP_DEBUGF(TCP_DEBUG, ("\| %2"U16_F" \| \|%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"\| %5"U16_F" \| (hdrlen, flags (",
tax	0:66300c77c6e9	1520	TCPH_HDRLEN(tcphdr),
tax	0:66300c77c6e9	1521	TCPH_FLAGS(tcphdr) >> 5 & 1,
tax	0:66300c77c6e9	1522	TCPH_FLAGS(tcphdr) >> 4 & 1,
tax	0:66300c77c6e9	1523	TCPH_FLAGS(tcphdr) >> 3 & 1,
tax	0:66300c77c6e9	1524	TCPH_FLAGS(tcphdr) >> 2 & 1,
tax	0:66300c77c6e9	1525	TCPH_FLAGS(tcphdr) >> 1 & 1,
tax	0:66300c77c6e9	1526	TCPH_FLAGS(tcphdr) & 1,
tax	0:66300c77c6e9	1527	ntohs(tcphdr->wnd)));
tax	0:66300c77c6e9	1528	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
tax	0:66300c77c6e9	1529	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
tax	0:66300c77c6e9	1530	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	1531	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
tax	0:66300c77c6e9	1532	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
tax	0:66300c77c6e9	1533	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	1534	}
tax	0:66300c77c6e9	1535
tax	0:66300c77c6e9	1536	/**
tax	0:66300c77c6e9	1537	* Print a tcp state for debugging purposes.
tax	0:66300c77c6e9	1538	*
tax	0:66300c77c6e9	1539	* @param s enum tcp_state to print
tax	0:66300c77c6e9	1540	*/
tax	0:66300c77c6e9	1541	void
tax	0:66300c77c6e9	1542	tcp_debug_print_state(enum tcp_state s)
tax	0:66300c77c6e9	1543	{
tax	0:66300c77c6e9	1544	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
tax	0:66300c77c6e9	1545	}
tax	0:66300c77c6e9	1546
tax	0:66300c77c6e9	1547	/**
tax	0:66300c77c6e9	1548	* Print tcp flags for debugging purposes.
tax	0:66300c77c6e9	1549	*
tax	0:66300c77c6e9	1550	* @param flags tcp flags, all active flags are printed
tax	0:66300c77c6e9	1551	*/
tax	0:66300c77c6e9	1552	void
tax	0:66300c77c6e9	1553	tcp_debug_print_flags(u8_t flags)
tax	0:66300c77c6e9	1554	{
tax	0:66300c77c6e9	1555	if (flags & TCP_FIN) {
tax	0:66300c77c6e9	1556	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
tax	0:66300c77c6e9	1557	}
tax	0:66300c77c6e9	1558	if (flags & TCP_SYN) {
tax	0:66300c77c6e9	1559	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
tax	0:66300c77c6e9	1560	}
tax	0:66300c77c6e9	1561	if (flags & TCP_RST) {
tax	0:66300c77c6e9	1562	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
tax	0:66300c77c6e9	1563	}
tax	0:66300c77c6e9	1564	if (flags & TCP_PSH) {
tax	0:66300c77c6e9	1565	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
tax	0:66300c77c6e9	1566	}
tax	0:66300c77c6e9	1567	if (flags & TCP_ACK) {
tax	0:66300c77c6e9	1568	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
tax	0:66300c77c6e9	1569	}
tax	0:66300c77c6e9	1570	if (flags & TCP_URG) {
tax	0:66300c77c6e9	1571	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
tax	0:66300c77c6e9	1572	}
tax	0:66300c77c6e9	1573	if (flags & TCP_ECE) {
tax	0:66300c77c6e9	1574	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
tax	0:66300c77c6e9	1575	}
tax	0:66300c77c6e9	1576	if (flags & TCP_CWR) {
tax	0:66300c77c6e9	1577	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
tax	0:66300c77c6e9	1578	}
tax	0:66300c77c6e9	1579	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
tax	0:66300c77c6e9	1580	}
tax	0:66300c77c6e9	1581
tax	0:66300c77c6e9	1582	/**
tax	0:66300c77c6e9	1583	* Print all tcp_pcbs in every list for debugging purposes.
tax	0:66300c77c6e9	1584	*/
tax	0:66300c77c6e9	1585	void
tax	0:66300c77c6e9	1586	tcp_debug_print_pcbs(void)
tax	0:66300c77c6e9	1587	{
tax	0:66300c77c6e9	1588	struct tcp_pcb *pcb;
tax	0:66300c77c6e9	1589	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
tax	0:66300c77c6e9	1590	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
tax	0:66300c77c6e9	1591	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
tax	0:66300c77c6e9	1592	pcb->local_port, pcb->remote_port,
tax	0:66300c77c6e9	1593	pcb->snd_nxt, pcb->rcv_nxt));
tax	0:66300c77c6e9	1594	tcp_debug_print_state(pcb->state);
tax	0:66300c77c6e9	1595	}
tax	0:66300c77c6e9	1596	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
tax	0:66300c77c6e9	1597	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
tax	0:66300c77c6e9	1598	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
tax	0:66300c77c6e9	1599	pcb->local_port, pcb->remote_port,
tax	0:66300c77c6e9	1600	pcb->snd_nxt, pcb->rcv_nxt));
tax	0:66300c77c6e9	1601	tcp_debug_print_state(pcb->state);
tax	0:66300c77c6e9	1602	}
tax	0:66300c77c6e9	1603	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
tax	0:66300c77c6e9	1604	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
tax	0:66300c77c6e9	1605	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
tax	0:66300c77c6e9	1606	pcb->local_port, pcb->remote_port,
tax	0:66300c77c6e9	1607	pcb->snd_nxt, pcb->rcv_nxt));
tax	0:66300c77c6e9	1608	tcp_debug_print_state(pcb->state);
tax	0:66300c77c6e9	1609	}
tax	0:66300c77c6e9	1610	}
tax	0:66300c77c6e9	1611
tax	0:66300c77c6e9	1612	/**
tax	0:66300c77c6e9	1613	* Check state consistency of the tcp_pcb lists.
tax	0:66300c77c6e9	1614	*/
tax	0:66300c77c6e9	1615	s16_t
tax	0:66300c77c6e9	1616	tcp_pcbs_sane(void)
tax	0:66300c77c6e9	1617	{
tax	0:66300c77c6e9	1618	struct tcp_pcb *pcb;
tax	0:66300c77c6e9	1619	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
tax	0:66300c77c6e9	1620	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
tax	0:66300c77c6e9	1621	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
tax	0:66300c77c6e9	1622	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
tax	0:66300c77c6e9	1623	}
tax	0:66300c77c6e9	1624	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
tax	0:66300c77c6e9	1625	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
tax	0:66300c77c6e9	1626	}
tax	0:66300c77c6e9	1627	return 1;
tax	0:66300c77c6e9	1628	}
tax	0:66300c77c6e9	1629	#endif /* TCP_DEBUG */
tax	0:66300c77c6e9	1630
tax	0:66300c77c6e9	1631	#endif /* LWIP_TCP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	29 Mar 2011
Imports:	16
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

lwip/core/tcp.c@0:66300c77c6e9, 2011-03-29 (annotated)

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