ublox_C200Test - Integrating the ublox LISA C200 modem

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Integrating the ublox LISA C200 modem

Fork of SprintUSBModemHTTPClientTest by Donatien Garnier

SprintUSBModem/lwip/core/tcp.c@5:3f93dd1d4cb3, 2013-09-26 (annotated)

Committer:: sam_grove
Date:: Thu Sep 26 00:44:20 2013 -0500
Revision:: 5:3f93dd1d4cb3

Exported program and replaced contents of the repo with the source

to build and debug using keil mdk. Libs NOT upto date are lwip, lwip-sys

and socket. these have newer versions under mbed_official but were starting

from a know working point

Who changed what in which revision?

User	Revision	Line number	New contents of line
sam_grove	5:3f93dd1d4cb3	1	/**
sam_grove	5:3f93dd1d4cb3	2	* @file
sam_grove	5:3f93dd1d4cb3	3	* Transmission Control Protocol for IP
sam_grove	5:3f93dd1d4cb3	4	*
sam_grove	5:3f93dd1d4cb3	5	* This file contains common functions for the TCP implementation, such as functinos
sam_grove	5:3f93dd1d4cb3	6	* for manipulating the data structures and the TCP timer functions. TCP functions
sam_grove	5:3f93dd1d4cb3	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
sam_grove	5:3f93dd1d4cb3	8	*
sam_grove	5:3f93dd1d4cb3	9	*/
sam_grove	5:3f93dd1d4cb3	10
sam_grove	5:3f93dd1d4cb3	11	/*
sam_grove	5:3f93dd1d4cb3	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
sam_grove	5:3f93dd1d4cb3	13	* All rights reserved.
sam_grove	5:3f93dd1d4cb3	14	*
sam_grove	5:3f93dd1d4cb3	15	* Redistribution and use in source and binary forms, with or without modification,
sam_grove	5:3f93dd1d4cb3	16	* are permitted provided that the following conditions are met:
sam_grove	5:3f93dd1d4cb3	17	*
sam_grove	5:3f93dd1d4cb3	18	* 1. Redistributions of source code must retain the above copyright notice,
sam_grove	5:3f93dd1d4cb3	19	* this list of conditions and the following disclaimer.
sam_grove	5:3f93dd1d4cb3	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
sam_grove	5:3f93dd1d4cb3	21	* this list of conditions and the following disclaimer in the documentation
sam_grove	5:3f93dd1d4cb3	22	* and/or other materials provided with the distribution.
sam_grove	5:3f93dd1d4cb3	23	* 3. The name of the author may not be used to endorse or promote products
sam_grove	5:3f93dd1d4cb3	24	* derived from this software without specific prior written permission.
sam_grove	5:3f93dd1d4cb3	25	*
sam_grove	5:3f93dd1d4cb3	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
sam_grove	5:3f93dd1d4cb3	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
sam_grove	5:3f93dd1d4cb3	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
sam_grove	5:3f93dd1d4cb3	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
sam_grove	5:3f93dd1d4cb3	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
sam_grove	5:3f93dd1d4cb3	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
sam_grove	5:3f93dd1d4cb3	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
sam_grove	5:3f93dd1d4cb3	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
sam_grove	5:3f93dd1d4cb3	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
sam_grove	5:3f93dd1d4cb3	35	* OF SUCH DAMAGE.
sam_grove	5:3f93dd1d4cb3	36	*
sam_grove	5:3f93dd1d4cb3	37	* This file is part of the lwIP TCP/IP stack.
sam_grove	5:3f93dd1d4cb3	38	*
sam_grove	5:3f93dd1d4cb3	39	* Author: Adam Dunkels <adam@sics.se>
sam_grove	5:3f93dd1d4cb3	40	*
sam_grove	5:3f93dd1d4cb3	41	*/
sam_grove	5:3f93dd1d4cb3	42
sam_grove	5:3f93dd1d4cb3	43	#include "lwip/opt.h"
sam_grove	5:3f93dd1d4cb3	44
sam_grove	5:3f93dd1d4cb3	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
sam_grove	5:3f93dd1d4cb3	46
sam_grove	5:3f93dd1d4cb3	47	#include "lwip/def.h"
sam_grove	5:3f93dd1d4cb3	48	#include "lwip/mem.h"
sam_grove	5:3f93dd1d4cb3	49	#include "lwip/memp.h"
sam_grove	5:3f93dd1d4cb3	50	#include "lwip/snmp.h"
sam_grove	5:3f93dd1d4cb3	51	#include "lwip/tcp.h"
sam_grove	5:3f93dd1d4cb3	52	#include "lwip/tcp_impl.h"
sam_grove	5:3f93dd1d4cb3	53	#include "lwip/debug.h"
sam_grove	5:3f93dd1d4cb3	54	#include "lwip/stats.h"
sam_grove	5:3f93dd1d4cb3	55
sam_grove	5:3f93dd1d4cb3	56	#include <string.h>
sam_grove	5:3f93dd1d4cb3	57
sam_grove	5:3f93dd1d4cb3	58	const char * const tcp_state_str[] = {
sam_grove	5:3f93dd1d4cb3	59	"CLOSED",
sam_grove	5:3f93dd1d4cb3	60	"LISTEN",
sam_grove	5:3f93dd1d4cb3	61	"SYN_SENT",
sam_grove	5:3f93dd1d4cb3	62	"SYN_RCVD",
sam_grove	5:3f93dd1d4cb3	63	"ESTABLISHED",
sam_grove	5:3f93dd1d4cb3	64	"FIN_WAIT_1",
sam_grove	5:3f93dd1d4cb3	65	"FIN_WAIT_2",
sam_grove	5:3f93dd1d4cb3	66	"CLOSE_WAIT",
sam_grove	5:3f93dd1d4cb3	67	"CLOSING",
sam_grove	5:3f93dd1d4cb3	68	"LAST_ACK",
sam_grove	5:3f93dd1d4cb3	69	"TIME_WAIT"
sam_grove	5:3f93dd1d4cb3	70	};
sam_grove	5:3f93dd1d4cb3	71
sam_grove	5:3f93dd1d4cb3	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
sam_grove	5:3f93dd1d4cb3	73	u32_t tcp_ticks;
sam_grove	5:3f93dd1d4cb3	74	const u8_t tcp_backoff[13] =
sam_grove	5:3f93dd1d4cb3	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
sam_grove	5:3f93dd1d4cb3	76	/* Times per slowtmr hits */
sam_grove	5:3f93dd1d4cb3	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
sam_grove	5:3f93dd1d4cb3	78
sam_grove	5:3f93dd1d4cb3	79	/* The TCP PCB lists. */
sam_grove	5:3f93dd1d4cb3	80
sam_grove	5:3f93dd1d4cb3	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
sam_grove	5:3f93dd1d4cb3	82	struct tcp_pcb *tcp_bound_pcbs;
sam_grove	5:3f93dd1d4cb3	83	/** List of all TCP PCBs in LISTEN state */
sam_grove	5:3f93dd1d4cb3	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
sam_grove	5:3f93dd1d4cb3	85	/** List of all TCP PCBs that are in a state in which
sam_grove	5:3f93dd1d4cb3	86	* they accept or send data. */
sam_grove	5:3f93dd1d4cb3	87	struct tcp_pcb *tcp_active_pcbs;
sam_grove	5:3f93dd1d4cb3	88	/** List of all TCP PCBs in TIME-WAIT state */
sam_grove	5:3f93dd1d4cb3	89	struct tcp_pcb *tcp_tw_pcbs;
sam_grove	5:3f93dd1d4cb3	90
sam_grove	5:3f93dd1d4cb3	91	#define NUM_TCP_PCB_LISTS 4
sam_grove	5:3f93dd1d4cb3	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
sam_grove	5:3f93dd1d4cb3	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
sam_grove	5:3f93dd1d4cb3	94	struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
sam_grove	5:3f93dd1d4cb3	95	&tcp_active_pcbs, &tcp_tw_pcbs};
sam_grove	5:3f93dd1d4cb3	96
sam_grove	5:3f93dd1d4cb3	97	/** Only used for temporary storage. */
sam_grove	5:3f93dd1d4cb3	98	struct tcp_pcb *tcp_tmp_pcb;
sam_grove	5:3f93dd1d4cb3	99
sam_grove	5:3f93dd1d4cb3	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
sam_grove	5:3f93dd1d4cb3	101	static u8_t tcp_timer;
sam_grove	5:3f93dd1d4cb3	102	static u16_t tcp_new_port(void);
sam_grove	5:3f93dd1d4cb3	103
sam_grove	5:3f93dd1d4cb3	104	/**
sam_grove	5:3f93dd1d4cb3	105	* Called periodically to dispatch TCP timers.
sam_grove	5:3f93dd1d4cb3	106	*
sam_grove	5:3f93dd1d4cb3	107	*/
sam_grove	5:3f93dd1d4cb3	108	void
sam_grove	5:3f93dd1d4cb3	109	tcp_tmr(void)
sam_grove	5:3f93dd1d4cb3	110	{
sam_grove	5:3f93dd1d4cb3	111	/* Call tcp_fasttmr() every 250 ms */
sam_grove	5:3f93dd1d4cb3	112	tcp_fasttmr();
sam_grove	5:3f93dd1d4cb3	113
sam_grove	5:3f93dd1d4cb3	114	if (++tcp_timer & 1) {
sam_grove	5:3f93dd1d4cb3	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
sam_grove	5:3f93dd1d4cb3	116	tcp_tmr() is called. */
sam_grove	5:3f93dd1d4cb3	117	tcp_slowtmr();
sam_grove	5:3f93dd1d4cb3	118	}
sam_grove	5:3f93dd1d4cb3	119	}
sam_grove	5:3f93dd1d4cb3	120
sam_grove	5:3f93dd1d4cb3	121	/**
sam_grove	5:3f93dd1d4cb3	122	* Closes the TX side of a connection held by the PCB.
sam_grove	5:3f93dd1d4cb3	123	* For tcp_close(), a RST is sent if the application didn't receive all data
sam_grove	5:3f93dd1d4cb3	124	* (tcp_recved() not called for all data passed to recv callback).
sam_grove	5:3f93dd1d4cb3	125	*
sam_grove	5:3f93dd1d4cb3	126	* Listening pcbs are freed and may not be referenced any more.
sam_grove	5:3f93dd1d4cb3	127	* Connection pcbs are freed if not yet connected and may not be referenced
sam_grove	5:3f93dd1d4cb3	128	* any more. If a connection is established (at least SYN received or in
sam_grove	5:3f93dd1d4cb3	129	* a closing state), the connection is closed, and put in a closing state.
sam_grove	5:3f93dd1d4cb3	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
sam_grove	5:3f93dd1d4cb3	131	* unsafe to reference it.
sam_grove	5:3f93dd1d4cb3	132	*
sam_grove	5:3f93dd1d4cb3	133	* @param pcb the tcp_pcb to close
sam_grove	5:3f93dd1d4cb3	134	* @return ERR_OK if connection has been closed
sam_grove	5:3f93dd1d4cb3	135	* another err_t if closing failed and pcb is not freed
sam_grove	5:3f93dd1d4cb3	136	*/
sam_grove	5:3f93dd1d4cb3	137	static err_t
sam_grove	5:3f93dd1d4cb3	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
sam_grove	5:3f93dd1d4cb3	139	{
sam_grove	5:3f93dd1d4cb3	140	err_t err;
sam_grove	5:3f93dd1d4cb3	141
sam_grove	5:3f93dd1d4cb3	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
sam_grove	5:3f93dd1d4cb3	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
sam_grove	5:3f93dd1d4cb3	144	/* Not all data received by application, send RST to tell the remote
sam_grove	5:3f93dd1d4cb3	145	side about this. */
sam_grove	5:3f93dd1d4cb3	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
sam_grove	5:3f93dd1d4cb3	147
sam_grove	5:3f93dd1d4cb3	148	/* don't call tcp_abort here: we must not deallocate the pcb since
sam_grove	5:3f93dd1d4cb3	149	that might not be expected when calling tcp_close */
sam_grove	5:3f93dd1d4cb3	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
sam_grove	5:3f93dd1d4cb3	151	pcb->local_port, pcb->remote_port);
sam_grove	5:3f93dd1d4cb3	152
sam_grove	5:3f93dd1d4cb3	153	tcp_pcb_purge(pcb);
sam_grove	5:3f93dd1d4cb3	154
sam_grove	5:3f93dd1d4cb3	155	/* TODO: to which state do we move now? */
sam_grove	5:3f93dd1d4cb3	156
sam_grove	5:3f93dd1d4cb3	157	/* move to TIME_WAIT since we close actively */
sam_grove	5:3f93dd1d4cb3	158	TCP_RMV(&tcp_active_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	159	pcb->state = TIME_WAIT;
sam_grove	5:3f93dd1d4cb3	160	TCP_REG(&tcp_tw_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	161
sam_grove	5:3f93dd1d4cb3	162	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	163	}
sam_grove	5:3f93dd1d4cb3	164	}
sam_grove	5:3f93dd1d4cb3	165
sam_grove	5:3f93dd1d4cb3	166	switch (pcb->state) {
sam_grove	5:3f93dd1d4cb3	167	case CLOSED:
sam_grove	5:3f93dd1d4cb3	168	/* Closing a pcb in the CLOSED state might seem erroneous,
sam_grove	5:3f93dd1d4cb3	169	* however, it is in this state once allocated and as yet unused
sam_grove	5:3f93dd1d4cb3	170	* and the user needs some way to free it should the need arise.
sam_grove	5:3f93dd1d4cb3	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
sam_grove	5:3f93dd1d4cb3	172	* or for a pcb that has been used and then entered the CLOSED state
sam_grove	5:3f93dd1d4cb3	173	* is erroneous, but this should never happen as the pcb has in those cases
sam_grove	5:3f93dd1d4cb3	174	* been freed, and so any remaining handles are bogus. */
sam_grove	5:3f93dd1d4cb3	175	err = ERR_OK;
sam_grove	5:3f93dd1d4cb3	176	if (pcb->local_port != 0) {
sam_grove	5:3f93dd1d4cb3	177	TCP_RMV(&tcp_bound_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	178	}
sam_grove	5:3f93dd1d4cb3	179	memp_free(MEMP_TCP_PCB, pcb);
sam_grove	5:3f93dd1d4cb3	180	pcb = NULL;
sam_grove	5:3f93dd1d4cb3	181	break;
sam_grove	5:3f93dd1d4cb3	182	case LISTEN:
sam_grove	5:3f93dd1d4cb3	183	err = ERR_OK;
sam_grove	5:3f93dd1d4cb3	184	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	185	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
sam_grove	5:3f93dd1d4cb3	186	pcb = NULL;
sam_grove	5:3f93dd1d4cb3	187	break;
sam_grove	5:3f93dd1d4cb3	188	case SYN_SENT:
sam_grove	5:3f93dd1d4cb3	189	err = ERR_OK;
sam_grove	5:3f93dd1d4cb3	190	tcp_pcb_remove(&tcp_active_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	191	memp_free(MEMP_TCP_PCB, pcb);
sam_grove	5:3f93dd1d4cb3	192	pcb = NULL;
sam_grove	5:3f93dd1d4cb3	193	snmp_inc_tcpattemptfails();
sam_grove	5:3f93dd1d4cb3	194	break;
sam_grove	5:3f93dd1d4cb3	195	case SYN_RCVD:
sam_grove	5:3f93dd1d4cb3	196	err = tcp_send_fin(pcb);
sam_grove	5:3f93dd1d4cb3	197	if (err == ERR_OK) {
sam_grove	5:3f93dd1d4cb3	198	snmp_inc_tcpattemptfails();
sam_grove	5:3f93dd1d4cb3	199	pcb->state = FIN_WAIT_1;
sam_grove	5:3f93dd1d4cb3	200	}
sam_grove	5:3f93dd1d4cb3	201	break;
sam_grove	5:3f93dd1d4cb3	202	case ESTABLISHED:
sam_grove	5:3f93dd1d4cb3	203	err = tcp_send_fin(pcb);
sam_grove	5:3f93dd1d4cb3	204	if (err == ERR_OK) {
sam_grove	5:3f93dd1d4cb3	205	snmp_inc_tcpestabresets();
sam_grove	5:3f93dd1d4cb3	206	pcb->state = FIN_WAIT_1;
sam_grove	5:3f93dd1d4cb3	207	}
sam_grove	5:3f93dd1d4cb3	208	break;
sam_grove	5:3f93dd1d4cb3	209	case CLOSE_WAIT:
sam_grove	5:3f93dd1d4cb3	210	err = tcp_send_fin(pcb);
sam_grove	5:3f93dd1d4cb3	211	if (err == ERR_OK) {
sam_grove	5:3f93dd1d4cb3	212	snmp_inc_tcpestabresets();
sam_grove	5:3f93dd1d4cb3	213	pcb->state = LAST_ACK;
sam_grove	5:3f93dd1d4cb3	214	}
sam_grove	5:3f93dd1d4cb3	215	break;
sam_grove	5:3f93dd1d4cb3	216	default:
sam_grove	5:3f93dd1d4cb3	217	/* Has already been closed, do nothing. */
sam_grove	5:3f93dd1d4cb3	218	err = ERR_OK;
sam_grove	5:3f93dd1d4cb3	219	pcb = NULL;
sam_grove	5:3f93dd1d4cb3	220	break;
sam_grove	5:3f93dd1d4cb3	221	}
sam_grove	5:3f93dd1d4cb3	222
sam_grove	5:3f93dd1d4cb3	223	if (pcb != NULL && err == ERR_OK) {
sam_grove	5:3f93dd1d4cb3	224	/* To ensure all data has been sent when tcp_close returns, we have
sam_grove	5:3f93dd1d4cb3	225	to make sure tcp_output doesn't fail.
sam_grove	5:3f93dd1d4cb3	226	Since we don't really have to ensure all data has been sent when tcp_close
sam_grove	5:3f93dd1d4cb3	227	returns (unsent data is sent from tcp timer functions, also), we don't care
sam_grove	5:3f93dd1d4cb3	228	for the return value of tcp_output for now. */
sam_grove	5:3f93dd1d4cb3	229	/* @todo: When implementing SO_LINGER, this must be changed somehow:
sam_grove	5:3f93dd1d4cb3	230	If SOF_LINGER is set, the data should be sent and acked before close returns.
sam_grove	5:3f93dd1d4cb3	231	This can only be valid for sequential APIs, not for the raw API. */
sam_grove	5:3f93dd1d4cb3	232	tcp_output(pcb);
sam_grove	5:3f93dd1d4cb3	233	}
sam_grove	5:3f93dd1d4cb3	234	return err;
sam_grove	5:3f93dd1d4cb3	235	}
sam_grove	5:3f93dd1d4cb3	236
sam_grove	5:3f93dd1d4cb3	237	/**
sam_grove	5:3f93dd1d4cb3	238	* Closes the connection held by the PCB.
sam_grove	5:3f93dd1d4cb3	239	*
sam_grove	5:3f93dd1d4cb3	240	* Listening pcbs are freed and may not be referenced any more.
sam_grove	5:3f93dd1d4cb3	241	* Connection pcbs are freed if not yet connected and may not be referenced
sam_grove	5:3f93dd1d4cb3	242	* any more. If a connection is established (at least SYN received or in
sam_grove	5:3f93dd1d4cb3	243	* a closing state), the connection is closed, and put in a closing state.
sam_grove	5:3f93dd1d4cb3	244	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
sam_grove	5:3f93dd1d4cb3	245	* unsafe to reference it (unless an error is returned).
sam_grove	5:3f93dd1d4cb3	246	*
sam_grove	5:3f93dd1d4cb3	247	* @param pcb the tcp_pcb to close
sam_grove	5:3f93dd1d4cb3	248	* @return ERR_OK if connection has been closed
sam_grove	5:3f93dd1d4cb3	249	* another err_t if closing failed and pcb is not freed
sam_grove	5:3f93dd1d4cb3	250	*/
sam_grove	5:3f93dd1d4cb3	251	err_t
sam_grove	5:3f93dd1d4cb3	252	tcp_close(struct tcp_pcb *pcb)
sam_grove	5:3f93dd1d4cb3	253	{
sam_grove	5:3f93dd1d4cb3	254	#if TCP_DEBUG
sam_grove	5:3f93dd1d4cb3	255	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
sam_grove	5:3f93dd1d4cb3	256	tcp_debug_print_state(pcb->state);
sam_grove	5:3f93dd1d4cb3	257	#endif /* TCP_DEBUG */
sam_grove	5:3f93dd1d4cb3	258
sam_grove	5:3f93dd1d4cb3	259	if (pcb->state != LISTEN) {
sam_grove	5:3f93dd1d4cb3	260	/* Set a flag not to receive any more data... */
sam_grove	5:3f93dd1d4cb3	261	pcb->flags \|= TF_RXCLOSED;
sam_grove	5:3f93dd1d4cb3	262	}
sam_grove	5:3f93dd1d4cb3	263	/* ... and close */
sam_grove	5:3f93dd1d4cb3	264	return tcp_close_shutdown(pcb, 1);
sam_grove	5:3f93dd1d4cb3	265	}
sam_grove	5:3f93dd1d4cb3	266
sam_grove	5:3f93dd1d4cb3	267	/**
sam_grove	5:3f93dd1d4cb3	268	* Causes all or part of a full-duplex connection of this PCB to be shut down.
sam_grove	5:3f93dd1d4cb3	269	* This doesn't deallocate the PCB!
sam_grove	5:3f93dd1d4cb3	270	*
sam_grove	5:3f93dd1d4cb3	271	* @param pcb PCB to shutdown
sam_grove	5:3f93dd1d4cb3	272	* @param shut_rx shut down receive side if this is != 0
sam_grove	5:3f93dd1d4cb3	273	* @param shut_tx shut down send side if this is != 0
sam_grove	5:3f93dd1d4cb3	274	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
sam_grove	5:3f93dd1d4cb3	275	* another err_t on error.
sam_grove	5:3f93dd1d4cb3	276	*/
sam_grove	5:3f93dd1d4cb3	277	err_t
sam_grove	5:3f93dd1d4cb3	278	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
sam_grove	5:3f93dd1d4cb3	279	{
sam_grove	5:3f93dd1d4cb3	280	if (pcb->state == LISTEN) {
sam_grove	5:3f93dd1d4cb3	281	return ERR_CONN;
sam_grove	5:3f93dd1d4cb3	282	}
sam_grove	5:3f93dd1d4cb3	283	if (shut_rx) {
sam_grove	5:3f93dd1d4cb3	284	/* shut down the receive side: free buffered data... */
sam_grove	5:3f93dd1d4cb3	285	if (pcb->refused_data != NULL) {
sam_grove	5:3f93dd1d4cb3	286	pbuf_free(pcb->refused_data);
sam_grove	5:3f93dd1d4cb3	287	pcb->refused_data = NULL;
sam_grove	5:3f93dd1d4cb3	288	}
sam_grove	5:3f93dd1d4cb3	289	/* ... and set a flag not to receive any more data */
sam_grove	5:3f93dd1d4cb3	290	pcb->flags \|= TF_RXCLOSED;
sam_grove	5:3f93dd1d4cb3	291	}
sam_grove	5:3f93dd1d4cb3	292	if (shut_tx) {
sam_grove	5:3f93dd1d4cb3	293	/* This can't happen twice since if it succeeds, the pcb's state is changed.
sam_grove	5:3f93dd1d4cb3	294	Only close in these states as the others directly deallocate the PCB */
sam_grove	5:3f93dd1d4cb3	295	switch (pcb->state) {
sam_grove	5:3f93dd1d4cb3	296	case SYN_RCVD:
sam_grove	5:3f93dd1d4cb3	297	case ESTABLISHED:
sam_grove	5:3f93dd1d4cb3	298	case CLOSE_WAIT:
sam_grove	5:3f93dd1d4cb3	299	return tcp_close_shutdown(pcb, 0);
sam_grove	5:3f93dd1d4cb3	300	default:
sam_grove	5:3f93dd1d4cb3	301	/* don't shut down other states */
sam_grove	5:3f93dd1d4cb3	302	break;
sam_grove	5:3f93dd1d4cb3	303	}
sam_grove	5:3f93dd1d4cb3	304	}
sam_grove	5:3f93dd1d4cb3	305	/* @todo: return another err_t if not in correct state or already shut? */
sam_grove	5:3f93dd1d4cb3	306	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	307	}
sam_grove	5:3f93dd1d4cb3	308
sam_grove	5:3f93dd1d4cb3	309	/**
sam_grove	5:3f93dd1d4cb3	310	* Abandons a connection and optionally sends a RST to the remote
sam_grove	5:3f93dd1d4cb3	311	* host. Deletes the local protocol control block. This is done when
sam_grove	5:3f93dd1d4cb3	312	* a connection is killed because of shortage of memory.
sam_grove	5:3f93dd1d4cb3	313	*
sam_grove	5:3f93dd1d4cb3	314	* @param pcb the tcp_pcb to abort
sam_grove	5:3f93dd1d4cb3	315	* @param reset boolean to indicate whether a reset should be sent
sam_grove	5:3f93dd1d4cb3	316	*/
sam_grove	5:3f93dd1d4cb3	317	void
sam_grove	5:3f93dd1d4cb3	318	tcp_abandon(struct tcp_pcb *pcb, int reset)
sam_grove	5:3f93dd1d4cb3	319	{
sam_grove	5:3f93dd1d4cb3	320	u32_t seqno, ackno;
sam_grove	5:3f93dd1d4cb3	321	u16_t remote_port, local_port;
sam_grove	5:3f93dd1d4cb3	322	ip_addr_t remote_ip, local_ip;
sam_grove	5:3f93dd1d4cb3	323	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	324	tcp_err_fn errf;
sam_grove	5:3f93dd1d4cb3	325	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	326	void *errf_arg;
sam_grove	5:3f93dd1d4cb3	327
sam_grove	5:3f93dd1d4cb3	328	/* pcb->state LISTEN not allowed here */
sam_grove	5:3f93dd1d4cb3	329	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
sam_grove	5:3f93dd1d4cb3	330	pcb->state != LISTEN);
sam_grove	5:3f93dd1d4cb3	331	/* Figure out on which TCP PCB list we are, and remove us. If we
sam_grove	5:3f93dd1d4cb3	332	are in an active state, call the receive function associated with
sam_grove	5:3f93dd1d4cb3	333	the PCB with a NULL argument, and send an RST to the remote end. */
sam_grove	5:3f93dd1d4cb3	334	if (pcb->state == TIME_WAIT) {
sam_grove	5:3f93dd1d4cb3	335	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	336	memp_free(MEMP_TCP_PCB, pcb);
sam_grove	5:3f93dd1d4cb3	337	} else {
sam_grove	5:3f93dd1d4cb3	338	seqno = pcb->snd_nxt;
sam_grove	5:3f93dd1d4cb3	339	ackno = pcb->rcv_nxt;
sam_grove	5:3f93dd1d4cb3	340	ip_addr_copy(local_ip, pcb->local_ip);
sam_grove	5:3f93dd1d4cb3	341	ip_addr_copy(remote_ip, pcb->remote_ip);
sam_grove	5:3f93dd1d4cb3	342	local_port = pcb->local_port;
sam_grove	5:3f93dd1d4cb3	343	remote_port = pcb->remote_port;
sam_grove	5:3f93dd1d4cb3	344	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	345	errf = pcb->errf;
sam_grove	5:3f93dd1d4cb3	346	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	347	errf_arg = pcb->callback_arg;
sam_grove	5:3f93dd1d4cb3	348	tcp_pcb_remove(&tcp_active_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	349	if (pcb->unacked != NULL) {
sam_grove	5:3f93dd1d4cb3	350	tcp_segs_free(pcb->unacked);
sam_grove	5:3f93dd1d4cb3	351	}
sam_grove	5:3f93dd1d4cb3	352	if (pcb->unsent != NULL) {
sam_grove	5:3f93dd1d4cb3	353	tcp_segs_free(pcb->unsent);
sam_grove	5:3f93dd1d4cb3	354	}
sam_grove	5:3f93dd1d4cb3	355	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	356	if (pcb->ooseq != NULL) {
sam_grove	5:3f93dd1d4cb3	357	tcp_segs_free(pcb->ooseq);
sam_grove	5:3f93dd1d4cb3	358	}
sam_grove	5:3f93dd1d4cb3	359	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	360	memp_free(MEMP_TCP_PCB, pcb);
sam_grove	5:3f93dd1d4cb3	361	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
sam_grove	5:3f93dd1d4cb3	362	if (reset) {
sam_grove	5:3f93dd1d4cb3	363	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
sam_grove	5:3f93dd1d4cb3	364	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
sam_grove	5:3f93dd1d4cb3	365	}
sam_grove	5:3f93dd1d4cb3	366	}
sam_grove	5:3f93dd1d4cb3	367	}
sam_grove	5:3f93dd1d4cb3	368
sam_grove	5:3f93dd1d4cb3	369	/**
sam_grove	5:3f93dd1d4cb3	370	* Aborts the connection by sending a RST (reset) segment to the remote
sam_grove	5:3f93dd1d4cb3	371	* host. The pcb is deallocated. This function never fails.
sam_grove	5:3f93dd1d4cb3	372	*
sam_grove	5:3f93dd1d4cb3	373	* ATTENTION: When calling this from one of the TCP callbacks, make
sam_grove	5:3f93dd1d4cb3	374	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
sam_grove	5:3f93dd1d4cb3	375	* or you will risk accessing deallocated memory or memory leaks!
sam_grove	5:3f93dd1d4cb3	376	*
sam_grove	5:3f93dd1d4cb3	377	* @param pcb the tcp pcb to abort
sam_grove	5:3f93dd1d4cb3	378	*/
sam_grove	5:3f93dd1d4cb3	379	void
sam_grove	5:3f93dd1d4cb3	380	tcp_abort(struct tcp_pcb *pcb)
sam_grove	5:3f93dd1d4cb3	381	{
sam_grove	5:3f93dd1d4cb3	382	tcp_abandon(pcb, 1);
sam_grove	5:3f93dd1d4cb3	383	}
sam_grove	5:3f93dd1d4cb3	384
sam_grove	5:3f93dd1d4cb3	385	/**
sam_grove	5:3f93dd1d4cb3	386	* Binds the connection to a local portnumber and IP address. If the
sam_grove	5:3f93dd1d4cb3	387	* IP address is not given (i.e., ipaddr == NULL), the IP address of
sam_grove	5:3f93dd1d4cb3	388	* the outgoing network interface is used instead.
sam_grove	5:3f93dd1d4cb3	389	*
sam_grove	5:3f93dd1d4cb3	390	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
sam_grove	5:3f93dd1d4cb3	391	* already bound!)
sam_grove	5:3f93dd1d4cb3	392	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
sam_grove	5:3f93dd1d4cb3	393	* to any local address
sam_grove	5:3f93dd1d4cb3	394	* @param port the local port to bind to
sam_grove	5:3f93dd1d4cb3	395	* @return ERR_USE if the port is already in use
sam_grove	5:3f93dd1d4cb3	396	* ERR_VAL if bind failed because the PCB is not in a valid state
sam_grove	5:3f93dd1d4cb3	397	* ERR_OK if bound
sam_grove	5:3f93dd1d4cb3	398	*/
sam_grove	5:3f93dd1d4cb3	399	err_t
sam_grove	5:3f93dd1d4cb3	400	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
sam_grove	5:3f93dd1d4cb3	401	{
sam_grove	5:3f93dd1d4cb3	402	int i;
sam_grove	5:3f93dd1d4cb3	403	int max_pcb_list = NUM_TCP_PCB_LISTS;
sam_grove	5:3f93dd1d4cb3	404	struct tcp_pcb *cpcb;
sam_grove	5:3f93dd1d4cb3	405
sam_grove	5:3f93dd1d4cb3	406	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
sam_grove	5:3f93dd1d4cb3	407
sam_grove	5:3f93dd1d4cb3	408	#if SO_REUSE
sam_grove	5:3f93dd1d4cb3	409	/* Unless the REUSEADDR flag is set,
sam_grove	5:3f93dd1d4cb3	410	we have to check the pcbs in TIME-WAIT state, also.
sam_grove	5:3f93dd1d4cb3	411	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
sam_grove	5:3f93dd1d4cb3	412	packets using both local and remote IP addresses and ports to distinguish.
sam_grove	5:3f93dd1d4cb3	413	*/
sam_grove	5:3f93dd1d4cb3	414	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
sam_grove	5:3f93dd1d4cb3	415	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
sam_grove	5:3f93dd1d4cb3	416	}
sam_grove	5:3f93dd1d4cb3	417	#endif /* SO_REUSE */
sam_grove	5:3f93dd1d4cb3	418
sam_grove	5:3f93dd1d4cb3	419	if (port == 0) {
sam_grove	5:3f93dd1d4cb3	420	port = tcp_new_port();
sam_grove	5:3f93dd1d4cb3	421	}
sam_grove	5:3f93dd1d4cb3	422
sam_grove	5:3f93dd1d4cb3	423	/* Check if the address already is in use (on all lists) */
sam_grove	5:3f93dd1d4cb3	424	for (i = 0; i < max_pcb_list; i++) {
sam_grove	5:3f93dd1d4cb3	425	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
sam_grove	5:3f93dd1d4cb3	426	if (cpcb->local_port == port) {
sam_grove	5:3f93dd1d4cb3	427	#if SO_REUSE
sam_grove	5:3f93dd1d4cb3	428	/* Omit checking for the same port if both pcbs have REUSEADDR set.
sam_grove	5:3f93dd1d4cb3	429	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
sam_grove	5:3f93dd1d4cb3	430	tcp_connect. */
sam_grove	5:3f93dd1d4cb3	431	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
sam_grove	5:3f93dd1d4cb3	432	((cpcb->so_options & SOF_REUSEADDR) == 0))
sam_grove	5:3f93dd1d4cb3	433	#endif /* SO_REUSE */
sam_grove	5:3f93dd1d4cb3	434	{
sam_grove	5:3f93dd1d4cb3	435	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
sam_grove	5:3f93dd1d4cb3	436	ip_addr_isany(ipaddr) \|\|
sam_grove	5:3f93dd1d4cb3	437	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
sam_grove	5:3f93dd1d4cb3	438	return ERR_USE;
sam_grove	5:3f93dd1d4cb3	439	}
sam_grove	5:3f93dd1d4cb3	440	}
sam_grove	5:3f93dd1d4cb3	441	}
sam_grove	5:3f93dd1d4cb3	442	}
sam_grove	5:3f93dd1d4cb3	443	}
sam_grove	5:3f93dd1d4cb3	444
sam_grove	5:3f93dd1d4cb3	445	if (!ip_addr_isany(ipaddr)) {
sam_grove	5:3f93dd1d4cb3	446	pcb->local_ip = *ipaddr;
sam_grove	5:3f93dd1d4cb3	447	}
sam_grove	5:3f93dd1d4cb3	448	pcb->local_port = port;
sam_grove	5:3f93dd1d4cb3	449	TCP_REG(&tcp_bound_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	450	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
sam_grove	5:3f93dd1d4cb3	451	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	452	}
sam_grove	5:3f93dd1d4cb3	453	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	454	/**
sam_grove	5:3f93dd1d4cb3	455	* Default accept callback if no accept callback is specified by the user.
sam_grove	5:3f93dd1d4cb3	456	*/
sam_grove	5:3f93dd1d4cb3	457	static err_t
sam_grove	5:3f93dd1d4cb3	458	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
sam_grove	5:3f93dd1d4cb3	459	{
sam_grove	5:3f93dd1d4cb3	460	LWIP_UNUSED_ARG(arg);
sam_grove	5:3f93dd1d4cb3	461	LWIP_UNUSED_ARG(pcb);
sam_grove	5:3f93dd1d4cb3	462	LWIP_UNUSED_ARG(err);
sam_grove	5:3f93dd1d4cb3	463
sam_grove	5:3f93dd1d4cb3	464	return ERR_ABRT;
sam_grove	5:3f93dd1d4cb3	465	}
sam_grove	5:3f93dd1d4cb3	466	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	467
sam_grove	5:3f93dd1d4cb3	468	/**
sam_grove	5:3f93dd1d4cb3	469	* Set the state of the connection to be LISTEN, which means that it
sam_grove	5:3f93dd1d4cb3	470	* is able to accept incoming connections. The protocol control block
sam_grove	5:3f93dd1d4cb3	471	* is reallocated in order to consume less memory. Setting the
sam_grove	5:3f93dd1d4cb3	472	* connection to LISTEN is an irreversible process.
sam_grove	5:3f93dd1d4cb3	473	*
sam_grove	5:3f93dd1d4cb3	474	* @param pcb the original tcp_pcb
sam_grove	5:3f93dd1d4cb3	475	* @param backlog the incoming connections queue limit
sam_grove	5:3f93dd1d4cb3	476	* @return tcp_pcb used for listening, consumes less memory.
sam_grove	5:3f93dd1d4cb3	477	*
sam_grove	5:3f93dd1d4cb3	478	* @note The original tcp_pcb is freed. This function therefore has to be
sam_grove	5:3f93dd1d4cb3	479	* called like this:
sam_grove	5:3f93dd1d4cb3	480	* tpcb = tcp_listen(tpcb);
sam_grove	5:3f93dd1d4cb3	481	*/
sam_grove	5:3f93dd1d4cb3	482	struct tcp_pcb *
sam_grove	5:3f93dd1d4cb3	483	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
sam_grove	5:3f93dd1d4cb3	484	{
sam_grove	5:3f93dd1d4cb3	485	struct tcp_pcb_listen *lpcb;
sam_grove	5:3f93dd1d4cb3	486
sam_grove	5:3f93dd1d4cb3	487	LWIP_UNUSED_ARG(backlog);
sam_grove	5:3f93dd1d4cb3	488	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
sam_grove	5:3f93dd1d4cb3	489
sam_grove	5:3f93dd1d4cb3	490	/* already listening? */
sam_grove	5:3f93dd1d4cb3	491	if (pcb->state == LISTEN) {
sam_grove	5:3f93dd1d4cb3	492	return pcb;
sam_grove	5:3f93dd1d4cb3	493	}
sam_grove	5:3f93dd1d4cb3	494	#if SO_REUSE
sam_grove	5:3f93dd1d4cb3	495	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
sam_grove	5:3f93dd1d4cb3	496	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
sam_grove	5:3f93dd1d4cb3	497	is declared (listen-/connection-pcb), we have to make sure now that
sam_grove	5:3f93dd1d4cb3	498	this port is only used once for every local IP. */
sam_grove	5:3f93dd1d4cb3	499	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
sam_grove	5:3f93dd1d4cb3	500	if (lpcb->local_port == pcb->local_port) {
sam_grove	5:3f93dd1d4cb3	501	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
sam_grove	5:3f93dd1d4cb3	502	/* this address/port is already used */
sam_grove	5:3f93dd1d4cb3	503	return NULL;
sam_grove	5:3f93dd1d4cb3	504	}
sam_grove	5:3f93dd1d4cb3	505	}
sam_grove	5:3f93dd1d4cb3	506	}
sam_grove	5:3f93dd1d4cb3	507	}
sam_grove	5:3f93dd1d4cb3	508	#endif /* SO_REUSE */
sam_grove	5:3f93dd1d4cb3	509	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
sam_grove	5:3f93dd1d4cb3	510	if (lpcb == NULL) {
sam_grove	5:3f93dd1d4cb3	511	return NULL;
sam_grove	5:3f93dd1d4cb3	512	}
sam_grove	5:3f93dd1d4cb3	513	lpcb->callback_arg = pcb->callback_arg;
sam_grove	5:3f93dd1d4cb3	514	lpcb->local_port = pcb->local_port;
sam_grove	5:3f93dd1d4cb3	515	lpcb->state = LISTEN;
sam_grove	5:3f93dd1d4cb3	516	lpcb->prio = pcb->prio;
sam_grove	5:3f93dd1d4cb3	517	lpcb->so_options = pcb->so_options;
sam_grove	5:3f93dd1d4cb3	518	lpcb->so_options \|= SOF_ACCEPTCONN;
sam_grove	5:3f93dd1d4cb3	519	lpcb->ttl = pcb->ttl;
sam_grove	5:3f93dd1d4cb3	520	lpcb->tos = pcb->tos;
sam_grove	5:3f93dd1d4cb3	521	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
sam_grove	5:3f93dd1d4cb3	522	if (pcb->local_port != 0) {
sam_grove	5:3f93dd1d4cb3	523	TCP_RMV(&tcp_bound_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	524	}
sam_grove	5:3f93dd1d4cb3	525	memp_free(MEMP_TCP_PCB, pcb);
sam_grove	5:3f93dd1d4cb3	526	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	527	lpcb->accept = tcp_accept_null;
sam_grove	5:3f93dd1d4cb3	528	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	529	#if TCP_LISTEN_BACKLOG
sam_grove	5:3f93dd1d4cb3	530	lpcb->accepts_pending = 0;
sam_grove	5:3f93dd1d4cb3	531	lpcb->backlog = (backlog ? backlog : 1);
sam_grove	5:3f93dd1d4cb3	532	#endif /* TCP_LISTEN_BACKLOG */
sam_grove	5:3f93dd1d4cb3	533	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
sam_grove	5:3f93dd1d4cb3	534	return (struct tcp_pcb *)lpcb;
sam_grove	5:3f93dd1d4cb3	535	}
sam_grove	5:3f93dd1d4cb3	536
sam_grove	5:3f93dd1d4cb3	537	/**
sam_grove	5:3f93dd1d4cb3	538	* Update the state that tracks the available window space to advertise.
sam_grove	5:3f93dd1d4cb3	539	*
sam_grove	5:3f93dd1d4cb3	540	* Returns how much extra window would be advertised if we sent an
sam_grove	5:3f93dd1d4cb3	541	* update now.
sam_grove	5:3f93dd1d4cb3	542	*/
sam_grove	5:3f93dd1d4cb3	543	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
sam_grove	5:3f93dd1d4cb3	544	{
sam_grove	5:3f93dd1d4cb3	545	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
sam_grove	5:3f93dd1d4cb3	546
sam_grove	5:3f93dd1d4cb3	547	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
sam_grove	5:3f93dd1d4cb3	548	/* we can advertise more window */
sam_grove	5:3f93dd1d4cb3	549	pcb->rcv_ann_wnd = pcb->rcv_wnd;
sam_grove	5:3f93dd1d4cb3	550	return new_right_edge - pcb->rcv_ann_right_edge;
sam_grove	5:3f93dd1d4cb3	551	} else {
sam_grove	5:3f93dd1d4cb3	552	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
sam_grove	5:3f93dd1d4cb3	553	/* Can happen due to other end sending out of advertised window,
sam_grove	5:3f93dd1d4cb3	554	* but within actual available (but not yet advertised) window */
sam_grove	5:3f93dd1d4cb3	555	pcb->rcv_ann_wnd = 0;
sam_grove	5:3f93dd1d4cb3	556	} else {
sam_grove	5:3f93dd1d4cb3	557	/* keep the right edge of window constant */
sam_grove	5:3f93dd1d4cb3	558	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
sam_grove	5:3f93dd1d4cb3	559	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
sam_grove	5:3f93dd1d4cb3	560	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
sam_grove	5:3f93dd1d4cb3	561	}
sam_grove	5:3f93dd1d4cb3	562	return 0;
sam_grove	5:3f93dd1d4cb3	563	}
sam_grove	5:3f93dd1d4cb3	564	}
sam_grove	5:3f93dd1d4cb3	565
sam_grove	5:3f93dd1d4cb3	566	/**
sam_grove	5:3f93dd1d4cb3	567	* This function should be called by the application when it has
sam_grove	5:3f93dd1d4cb3	568	* processed the data. The purpose is to advertise a larger window
sam_grove	5:3f93dd1d4cb3	569	* when the data has been processed.
sam_grove	5:3f93dd1d4cb3	570	*
sam_grove	5:3f93dd1d4cb3	571	* @param pcb the tcp_pcb for which data is read
sam_grove	5:3f93dd1d4cb3	572	* @param len the amount of bytes that have been read by the application
sam_grove	5:3f93dd1d4cb3	573	*/
sam_grove	5:3f93dd1d4cb3	574	void
sam_grove	5:3f93dd1d4cb3	575	tcp_recved(struct tcp_pcb *pcb, u16_t len)
sam_grove	5:3f93dd1d4cb3	576	{
sam_grove	5:3f93dd1d4cb3	577	int wnd_inflation;
sam_grove	5:3f93dd1d4cb3	578
sam_grove	5:3f93dd1d4cb3	579	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
sam_grove	5:3f93dd1d4cb3	580	len <= 0xffff - pcb->rcv_wnd );
sam_grove	5:3f93dd1d4cb3	581
sam_grove	5:3f93dd1d4cb3	582	pcb->rcv_wnd += len;
sam_grove	5:3f93dd1d4cb3	583	if (pcb->rcv_wnd > TCP_WND) {
sam_grove	5:3f93dd1d4cb3	584	pcb->rcv_wnd = TCP_WND;
sam_grove	5:3f93dd1d4cb3	585	}
sam_grove	5:3f93dd1d4cb3	586
sam_grove	5:3f93dd1d4cb3	587	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
sam_grove	5:3f93dd1d4cb3	588
sam_grove	5:3f93dd1d4cb3	589	/* If the change in the right edge of window is significant (default
sam_grove	5:3f93dd1d4cb3	590	* watermark is TCP_WND/4), then send an explicit update now.
sam_grove	5:3f93dd1d4cb3	591	* Otherwise wait for a packet to be sent in the normal course of
sam_grove	5:3f93dd1d4cb3	592	* events (or more window to be available later) */
sam_grove	5:3f93dd1d4cb3	593	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
sam_grove	5:3f93dd1d4cb3	594	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	595	tcp_output(pcb);
sam_grove	5:3f93dd1d4cb3	596	}
sam_grove	5:3f93dd1d4cb3	597
sam_grove	5:3f93dd1d4cb3	598	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
sam_grove	5:3f93dd1d4cb3	599	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
sam_grove	5:3f93dd1d4cb3	600	}
sam_grove	5:3f93dd1d4cb3	601
sam_grove	5:3f93dd1d4cb3	602	/**
sam_grove	5:3f93dd1d4cb3	603	* A nastly hack featuring 'goto' statements that allocates a
sam_grove	5:3f93dd1d4cb3	604	* new TCP local port.
sam_grove	5:3f93dd1d4cb3	605	*
sam_grove	5:3f93dd1d4cb3	606	* @return a new (free) local TCP port number
sam_grove	5:3f93dd1d4cb3	607	*/
sam_grove	5:3f93dd1d4cb3	608	static u16_t
sam_grove	5:3f93dd1d4cb3	609	tcp_new_port(void)
sam_grove	5:3f93dd1d4cb3	610	{
sam_grove	5:3f93dd1d4cb3	611	int i;
sam_grove	5:3f93dd1d4cb3	612	struct tcp_pcb *pcb;
sam_grove	5:3f93dd1d4cb3	613	#ifndef TCP_LOCAL_PORT_RANGE_START
sam_grove	5:3f93dd1d4cb3	614	/* From http://www.iana.org/assignments/port-numbers:
sam_grove	5:3f93dd1d4cb3	615	"The Dynamic and/or Private Ports are those from 49152 through 65535" */
sam_grove	5:3f93dd1d4cb3	616	#define TCP_LOCAL_PORT_RANGE_START 0xc000
sam_grove	5:3f93dd1d4cb3	617	#define TCP_LOCAL_PORT_RANGE_END 0xffff
sam_grove	5:3f93dd1d4cb3	618	#endif
sam_grove	5:3f93dd1d4cb3	619	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
sam_grove	5:3f93dd1d4cb3	620
sam_grove	5:3f93dd1d4cb3	621	again:
sam_grove	5:3f93dd1d4cb3	622	if (port++ >= TCP_LOCAL_PORT_RANGE_END) {
sam_grove	5:3f93dd1d4cb3	623	port = TCP_LOCAL_PORT_RANGE_START;
sam_grove	5:3f93dd1d4cb3	624	}
sam_grove	5:3f93dd1d4cb3	625	/* Check all PCB lists. */
sam_grove	5:3f93dd1d4cb3	626	for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
sam_grove	5:3f93dd1d4cb3	627	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	628	if (pcb->local_port == port) {
sam_grove	5:3f93dd1d4cb3	629	goto again;
sam_grove	5:3f93dd1d4cb3	630	}
sam_grove	5:3f93dd1d4cb3	631	}
sam_grove	5:3f93dd1d4cb3	632	}
sam_grove	5:3f93dd1d4cb3	633	return port;
sam_grove	5:3f93dd1d4cb3	634	}
sam_grove	5:3f93dd1d4cb3	635
sam_grove	5:3f93dd1d4cb3	636	/**
sam_grove	5:3f93dd1d4cb3	637	* Connects to another host. The function given as the "connected"
sam_grove	5:3f93dd1d4cb3	638	* argument will be called when the connection has been established.
sam_grove	5:3f93dd1d4cb3	639	*
sam_grove	5:3f93dd1d4cb3	640	* @param pcb the tcp_pcb used to establish the connection
sam_grove	5:3f93dd1d4cb3	641	* @param ipaddr the remote ip address to connect to
sam_grove	5:3f93dd1d4cb3	642	* @param port the remote tcp port to connect to
sam_grove	5:3f93dd1d4cb3	643	* @param connected callback function to call when connected (or on error)
sam_grove	5:3f93dd1d4cb3	644	* @return ERR_VAL if invalid arguments are given
sam_grove	5:3f93dd1d4cb3	645	* ERR_OK if connect request has been sent
sam_grove	5:3f93dd1d4cb3	646	* other err_t values if connect request couldn't be sent
sam_grove	5:3f93dd1d4cb3	647	*/
sam_grove	5:3f93dd1d4cb3	648	err_t
sam_grove	5:3f93dd1d4cb3	649	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
sam_grove	5:3f93dd1d4cb3	650	tcp_connected_fn connected)
sam_grove	5:3f93dd1d4cb3	651	{
sam_grove	5:3f93dd1d4cb3	652	err_t ret;
sam_grove	5:3f93dd1d4cb3	653	u32_t iss;
sam_grove	5:3f93dd1d4cb3	654	u16_t old_local_port;
sam_grove	5:3f93dd1d4cb3	655
sam_grove	5:3f93dd1d4cb3	656	LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
sam_grove	5:3f93dd1d4cb3	657
sam_grove	5:3f93dd1d4cb3	658	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
sam_grove	5:3f93dd1d4cb3	659	if (ipaddr != NULL) {
sam_grove	5:3f93dd1d4cb3	660	pcb->remote_ip = *ipaddr;
sam_grove	5:3f93dd1d4cb3	661	} else {
sam_grove	5:3f93dd1d4cb3	662	return ERR_VAL;
sam_grove	5:3f93dd1d4cb3	663	}
sam_grove	5:3f93dd1d4cb3	664	pcb->remote_port = port;
sam_grove	5:3f93dd1d4cb3	665
sam_grove	5:3f93dd1d4cb3	666	/* check if we have a route to the remote host */
sam_grove	5:3f93dd1d4cb3	667	if (ip_addr_isany(&(pcb->local_ip))) {
sam_grove	5:3f93dd1d4cb3	668	/* no local IP address set, yet. */
sam_grove	5:3f93dd1d4cb3	669	struct netif *netif = ip_route(&(pcb->remote_ip));
sam_grove	5:3f93dd1d4cb3	670	if (netif == NULL) {
sam_grove	5:3f93dd1d4cb3	671	/* Don't even try to send a SYN packet if we have no route
sam_grove	5:3f93dd1d4cb3	672	since that will fail. */
sam_grove	5:3f93dd1d4cb3	673	return ERR_RTE;
sam_grove	5:3f93dd1d4cb3	674	}
sam_grove	5:3f93dd1d4cb3	675	/* Use the netif's IP address as local address. */
sam_grove	5:3f93dd1d4cb3	676	ip_addr_copy(pcb->local_ip, netif->ip_addr);
sam_grove	5:3f93dd1d4cb3	677	}
sam_grove	5:3f93dd1d4cb3	678
sam_grove	5:3f93dd1d4cb3	679	old_local_port = pcb->local_port;
sam_grove	5:3f93dd1d4cb3	680	if (pcb->local_port == 0) {
sam_grove	5:3f93dd1d4cb3	681	pcb->local_port = tcp_new_port();
sam_grove	5:3f93dd1d4cb3	682	}
sam_grove	5:3f93dd1d4cb3	683	#if SO_REUSE
sam_grove	5:3f93dd1d4cb3	684	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
sam_grove	5:3f93dd1d4cb3	685	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
sam_grove	5:3f93dd1d4cb3	686	now that the 5-tuple is unique. */
sam_grove	5:3f93dd1d4cb3	687	struct tcp_pcb *cpcb;
sam_grove	5:3f93dd1d4cb3	688	int i;
sam_grove	5:3f93dd1d4cb3	689	/* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
sam_grove	5:3f93dd1d4cb3	690	for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
sam_grove	5:3f93dd1d4cb3	691	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
sam_grove	5:3f93dd1d4cb3	692	if ((cpcb->local_port == pcb->local_port) &&
sam_grove	5:3f93dd1d4cb3	693	(cpcb->remote_port == port) &&
sam_grove	5:3f93dd1d4cb3	694	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
sam_grove	5:3f93dd1d4cb3	695	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
sam_grove	5:3f93dd1d4cb3	696	/* linux returns EISCONN here, but ERR_USE should be OK for us */
sam_grove	5:3f93dd1d4cb3	697	return ERR_USE;
sam_grove	5:3f93dd1d4cb3	698	}
sam_grove	5:3f93dd1d4cb3	699	}
sam_grove	5:3f93dd1d4cb3	700	}
sam_grove	5:3f93dd1d4cb3	701	}
sam_grove	5:3f93dd1d4cb3	702	#endif /* SO_REUSE */
sam_grove	5:3f93dd1d4cb3	703	iss = tcp_next_iss();
sam_grove	5:3f93dd1d4cb3	704	pcb->rcv_nxt = 0;
sam_grove	5:3f93dd1d4cb3	705	pcb->snd_nxt = iss;
sam_grove	5:3f93dd1d4cb3	706	pcb->lastack = iss - 1;
sam_grove	5:3f93dd1d4cb3	707	pcb->snd_lbb = iss - 1;
sam_grove	5:3f93dd1d4cb3	708	pcb->rcv_wnd = TCP_WND;
sam_grove	5:3f93dd1d4cb3	709	pcb->rcv_ann_wnd = TCP_WND;
sam_grove	5:3f93dd1d4cb3	710	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
sam_grove	5:3f93dd1d4cb3	711	pcb->snd_wnd = TCP_WND;
sam_grove	5:3f93dd1d4cb3	712	/* As initial send MSS, we use TCP_MSS but limit it to 536.
sam_grove	5:3f93dd1d4cb3	713	The send MSS is updated when an MSS option is received. */
sam_grove	5:3f93dd1d4cb3	714	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
sam_grove	5:3f93dd1d4cb3	715	#if TCP_CALCULATE_EFF_SEND_MSS
sam_grove	5:3f93dd1d4cb3	716	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
sam_grove	5:3f93dd1d4cb3	717	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
sam_grove	5:3f93dd1d4cb3	718	pcb->cwnd = 1;
sam_grove	5:3f93dd1d4cb3	719	pcb->ssthresh = pcb->mss * 10;
sam_grove	5:3f93dd1d4cb3	720	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	721	pcb->connected = connected;
sam_grove	5:3f93dd1d4cb3	722	#else /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	723	LWIP_UNUSED_ARG(connected);
sam_grove	5:3f93dd1d4cb3	724	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	725
sam_grove	5:3f93dd1d4cb3	726	/* Send a SYN together with the MSS option. */
sam_grove	5:3f93dd1d4cb3	727	ret = tcp_enqueue_flags(pcb, TCP_SYN);
sam_grove	5:3f93dd1d4cb3	728	if (ret == ERR_OK) {
sam_grove	5:3f93dd1d4cb3	729	/* SYN segment was enqueued, changed the pcbs state now */
sam_grove	5:3f93dd1d4cb3	730	pcb->state = SYN_SENT;
sam_grove	5:3f93dd1d4cb3	731	if (old_local_port != 0) {
sam_grove	5:3f93dd1d4cb3	732	TCP_RMV(&tcp_bound_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	733	}
sam_grove	5:3f93dd1d4cb3	734	TCP_REG(&tcp_active_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	735	snmp_inc_tcpactiveopens();
sam_grove	5:3f93dd1d4cb3	736
sam_grove	5:3f93dd1d4cb3	737	tcp_output(pcb);
sam_grove	5:3f93dd1d4cb3	738	}
sam_grove	5:3f93dd1d4cb3	739	return ret;
sam_grove	5:3f93dd1d4cb3	740	}
sam_grove	5:3f93dd1d4cb3	741
sam_grove	5:3f93dd1d4cb3	742	/**
sam_grove	5:3f93dd1d4cb3	743	* Called every 500 ms and implements the retransmission timer and the timer that
sam_grove	5:3f93dd1d4cb3	744	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
sam_grove	5:3f93dd1d4cb3	745	* various timers such as the inactivity timer in each PCB.
sam_grove	5:3f93dd1d4cb3	746	*
sam_grove	5:3f93dd1d4cb3	747	* Automatically called from tcp_tmr().
sam_grove	5:3f93dd1d4cb3	748	*/
sam_grove	5:3f93dd1d4cb3	749	void
sam_grove	5:3f93dd1d4cb3	750	tcp_slowtmr(void)
sam_grove	5:3f93dd1d4cb3	751	{
sam_grove	5:3f93dd1d4cb3	752	struct tcp_pcb pcb, prev;
sam_grove	5:3f93dd1d4cb3	753	u16_t eff_wnd;
sam_grove	5:3f93dd1d4cb3	754	u8_t pcb_remove; /* flag if a PCB should be removed */
sam_grove	5:3f93dd1d4cb3	755	u8_t pcb_reset; /* flag if a RST should be sent when removing */
sam_grove	5:3f93dd1d4cb3	756	err_t err;
sam_grove	5:3f93dd1d4cb3	757
sam_grove	5:3f93dd1d4cb3	758	err = ERR_OK;
sam_grove	5:3f93dd1d4cb3	759
sam_grove	5:3f93dd1d4cb3	760	++tcp_ticks;
sam_grove	5:3f93dd1d4cb3	761
sam_grove	5:3f93dd1d4cb3	762	/* Steps through all of the active PCBs. */
sam_grove	5:3f93dd1d4cb3	763	prev = NULL;
sam_grove	5:3f93dd1d4cb3	764	pcb = tcp_active_pcbs;
sam_grove	5:3f93dd1d4cb3	765	if (pcb == NULL) {
sam_grove	5:3f93dd1d4cb3	766	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
sam_grove	5:3f93dd1d4cb3	767	}
sam_grove	5:3f93dd1d4cb3	768	while (pcb != NULL) {
sam_grove	5:3f93dd1d4cb3	769	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
sam_grove	5:3f93dd1d4cb3	770	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
sam_grove	5:3f93dd1d4cb3	771	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
sam_grove	5:3f93dd1d4cb3	772	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
sam_grove	5:3f93dd1d4cb3	773
sam_grove	5:3f93dd1d4cb3	774	pcb_remove = 0;
sam_grove	5:3f93dd1d4cb3	775	pcb_reset = 0;
sam_grove	5:3f93dd1d4cb3	776
sam_grove	5:3f93dd1d4cb3	777	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
sam_grove	5:3f93dd1d4cb3	778	++pcb_remove;
sam_grove	5:3f93dd1d4cb3	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
sam_grove	5:3f93dd1d4cb3	780	}
sam_grove	5:3f93dd1d4cb3	781	else if (pcb->nrtx == TCP_MAXRTX) {
sam_grove	5:3f93dd1d4cb3	782	++pcb_remove;
sam_grove	5:3f93dd1d4cb3	783	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
sam_grove	5:3f93dd1d4cb3	784	} else {
sam_grove	5:3f93dd1d4cb3	785	if (pcb->persist_backoff > 0) {
sam_grove	5:3f93dd1d4cb3	786	/* If snd_wnd is zero, use persist timer to send 1 byte probes
sam_grove	5:3f93dd1d4cb3	787	* instead of using the standard retransmission mechanism. */
sam_grove	5:3f93dd1d4cb3	788	pcb->persist_cnt++;
sam_grove	5:3f93dd1d4cb3	789	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
sam_grove	5:3f93dd1d4cb3	790	pcb->persist_cnt = 0;
sam_grove	5:3f93dd1d4cb3	791	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
sam_grove	5:3f93dd1d4cb3	792	pcb->persist_backoff++;
sam_grove	5:3f93dd1d4cb3	793	}
sam_grove	5:3f93dd1d4cb3	794	tcp_zero_window_probe(pcb);
sam_grove	5:3f93dd1d4cb3	795	}
sam_grove	5:3f93dd1d4cb3	796	} else {
sam_grove	5:3f93dd1d4cb3	797	/* Increase the retransmission timer if it is running */
sam_grove	5:3f93dd1d4cb3	798	if(pcb->rtime >= 0)
sam_grove	5:3f93dd1d4cb3	799	++pcb->rtime;
sam_grove	5:3f93dd1d4cb3	800
sam_grove	5:3f93dd1d4cb3	801	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
sam_grove	5:3f93dd1d4cb3	802	/* Time for a retransmission. */
sam_grove	5:3f93dd1d4cb3	803	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
sam_grove	5:3f93dd1d4cb3	804	" pcb->rto %"S16_F"\n",
sam_grove	5:3f93dd1d4cb3	805	pcb->rtime, pcb->rto));
sam_grove	5:3f93dd1d4cb3	806
sam_grove	5:3f93dd1d4cb3	807	/* Double retransmission time-out unless we are trying to
sam_grove	5:3f93dd1d4cb3	808	* connect to somebody (i.e., we are in SYN_SENT). */
sam_grove	5:3f93dd1d4cb3	809	if (pcb->state != SYN_SENT) {
sam_grove	5:3f93dd1d4cb3	810	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
sam_grove	5:3f93dd1d4cb3	811	}
sam_grove	5:3f93dd1d4cb3	812
sam_grove	5:3f93dd1d4cb3	813	/* Reset the retransmission timer. */
sam_grove	5:3f93dd1d4cb3	814	pcb->rtime = 0;
sam_grove	5:3f93dd1d4cb3	815
sam_grove	5:3f93dd1d4cb3	816	/* Reduce congestion window and ssthresh. */
sam_grove	5:3f93dd1d4cb3	817	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
sam_grove	5:3f93dd1d4cb3	818	pcb->ssthresh = eff_wnd >> 1;
sam_grove	5:3f93dd1d4cb3	819	if (pcb->ssthresh < (pcb->mss << 1)) {
sam_grove	5:3f93dd1d4cb3	820	pcb->ssthresh = (pcb->mss << 1);
sam_grove	5:3f93dd1d4cb3	821	}
sam_grove	5:3f93dd1d4cb3	822	pcb->cwnd = pcb->mss;
sam_grove	5:3f93dd1d4cb3	823	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
sam_grove	5:3f93dd1d4cb3	824	" ssthresh %"U16_F"\n",
sam_grove	5:3f93dd1d4cb3	825	pcb->cwnd, pcb->ssthresh));
sam_grove	5:3f93dd1d4cb3	826
sam_grove	5:3f93dd1d4cb3	827	/* The following needs to be called AFTER cwnd is set to one
sam_grove	5:3f93dd1d4cb3	828	mss - STJ */
sam_grove	5:3f93dd1d4cb3	829	tcp_rexmit_rto(pcb);
sam_grove	5:3f93dd1d4cb3	830	}
sam_grove	5:3f93dd1d4cb3	831	}
sam_grove	5:3f93dd1d4cb3	832	}
sam_grove	5:3f93dd1d4cb3	833	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
sam_grove	5:3f93dd1d4cb3	834	if (pcb->state == FIN_WAIT_2) {
sam_grove	5:3f93dd1d4cb3	835	if ((u32_t)(tcp_ticks - pcb->tmr) >
sam_grove	5:3f93dd1d4cb3	836	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
sam_grove	5:3f93dd1d4cb3	837	++pcb_remove;
sam_grove	5:3f93dd1d4cb3	838	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
sam_grove	5:3f93dd1d4cb3	839	}
sam_grove	5:3f93dd1d4cb3	840	}
sam_grove	5:3f93dd1d4cb3	841
sam_grove	5:3f93dd1d4cb3	842	/* Check if KEEPALIVE should be sent */
sam_grove	5:3f93dd1d4cb3	843	if((pcb->so_options & SOF_KEEPALIVE) &&
sam_grove	5:3f93dd1d4cb3	844	((pcb->state == ESTABLISHED) \|\|
sam_grove	5:3f93dd1d4cb3	845	(pcb->state == CLOSE_WAIT))) {
sam_grove	5:3f93dd1d4cb3	846	#if LWIP_TCP_KEEPALIVE
sam_grove	5:3f93dd1d4cb3	847	if((u32_t)(tcp_ticks - pcb->tmr) >
sam_grove	5:3f93dd1d4cb3	848	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
sam_grove	5:3f93dd1d4cb3	849	/ TCP_SLOW_INTERVAL)
sam_grove	5:3f93dd1d4cb3	850	#else
sam_grove	5:3f93dd1d4cb3	851	if((u32_t)(tcp_ticks - pcb->tmr) >
sam_grove	5:3f93dd1d4cb3	852	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
sam_grove	5:3f93dd1d4cb3	853	#endif /* LWIP_TCP_KEEPALIVE */
sam_grove	5:3f93dd1d4cb3	854	{
sam_grove	5:3f93dd1d4cb3	855	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
sam_grove	5:3f93dd1d4cb3	856	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
sam_grove	5:3f93dd1d4cb3	857	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
sam_grove	5:3f93dd1d4cb3	858
sam_grove	5:3f93dd1d4cb3	859	++pcb_remove;
sam_grove	5:3f93dd1d4cb3	860	++pcb_reset;
sam_grove	5:3f93dd1d4cb3	861	}
sam_grove	5:3f93dd1d4cb3	862	#if LWIP_TCP_KEEPALIVE
sam_grove	5:3f93dd1d4cb3	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
sam_grove	5:3f93dd1d4cb3	864	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
sam_grove	5:3f93dd1d4cb3	865	/ TCP_SLOW_INTERVAL)
sam_grove	5:3f93dd1d4cb3	866	#else
sam_grove	5:3f93dd1d4cb3	867	else if((u32_t)(tcp_ticks - pcb->tmr) >
sam_grove	5:3f93dd1d4cb3	868	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
sam_grove	5:3f93dd1d4cb3	869	/ TCP_SLOW_INTERVAL)
sam_grove	5:3f93dd1d4cb3	870	#endif /* LWIP_TCP_KEEPALIVE */
sam_grove	5:3f93dd1d4cb3	871	{
sam_grove	5:3f93dd1d4cb3	872	tcp_keepalive(pcb);
sam_grove	5:3f93dd1d4cb3	873	pcb->keep_cnt_sent++;
sam_grove	5:3f93dd1d4cb3	874	}
sam_grove	5:3f93dd1d4cb3	875	}
sam_grove	5:3f93dd1d4cb3	876
sam_grove	5:3f93dd1d4cb3	877	/* If this PCB has queued out of sequence data, but has been
sam_grove	5:3f93dd1d4cb3	878	inactive for too long, will drop the data (it will eventually
sam_grove	5:3f93dd1d4cb3	879	be retransmitted). */
sam_grove	5:3f93dd1d4cb3	880	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	881	if (pcb->ooseq != NULL &&
sam_grove	5:3f93dd1d4cb3	882	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
sam_grove	5:3f93dd1d4cb3	883	tcp_segs_free(pcb->ooseq);
sam_grove	5:3f93dd1d4cb3	884	pcb->ooseq = NULL;
sam_grove	5:3f93dd1d4cb3	885	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
sam_grove	5:3f93dd1d4cb3	886	}
sam_grove	5:3f93dd1d4cb3	887	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	888
sam_grove	5:3f93dd1d4cb3	889	/* Check if this PCB has stayed too long in SYN-RCVD */
sam_grove	5:3f93dd1d4cb3	890	if (pcb->state == SYN_RCVD) {
sam_grove	5:3f93dd1d4cb3	891	if ((u32_t)(tcp_ticks - pcb->tmr) >
sam_grove	5:3f93dd1d4cb3	892	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
sam_grove	5:3f93dd1d4cb3	893	++pcb_remove;
sam_grove	5:3f93dd1d4cb3	894	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
sam_grove	5:3f93dd1d4cb3	895	}
sam_grove	5:3f93dd1d4cb3	896	}
sam_grove	5:3f93dd1d4cb3	897
sam_grove	5:3f93dd1d4cb3	898	/* Check if this PCB has stayed too long in LAST-ACK */
sam_grove	5:3f93dd1d4cb3	899	if (pcb->state == LAST_ACK) {
sam_grove	5:3f93dd1d4cb3	900	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
sam_grove	5:3f93dd1d4cb3	901	++pcb_remove;
sam_grove	5:3f93dd1d4cb3	902	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
sam_grove	5:3f93dd1d4cb3	903	}
sam_grove	5:3f93dd1d4cb3	904	}
sam_grove	5:3f93dd1d4cb3	905
sam_grove	5:3f93dd1d4cb3	906	/* If the PCB should be removed, do it. */
sam_grove	5:3f93dd1d4cb3	907	if (pcb_remove) {
sam_grove	5:3f93dd1d4cb3	908	struct tcp_pcb *pcb2;
sam_grove	5:3f93dd1d4cb3	909	tcp_pcb_purge(pcb);
sam_grove	5:3f93dd1d4cb3	910	/* Remove PCB from tcp_active_pcbs list. */
sam_grove	5:3f93dd1d4cb3	911	if (prev != NULL) {
sam_grove	5:3f93dd1d4cb3	912	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
sam_grove	5:3f93dd1d4cb3	913	prev->next = pcb->next;
sam_grove	5:3f93dd1d4cb3	914	} else {
sam_grove	5:3f93dd1d4cb3	915	/* This PCB was the first. */
sam_grove	5:3f93dd1d4cb3	916	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
sam_grove	5:3f93dd1d4cb3	917	tcp_active_pcbs = pcb->next;
sam_grove	5:3f93dd1d4cb3	918	}
sam_grove	5:3f93dd1d4cb3	919
sam_grove	5:3f93dd1d4cb3	920	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
sam_grove	5:3f93dd1d4cb3	921	if (pcb_reset) {
sam_grove	5:3f93dd1d4cb3	922	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
sam_grove	5:3f93dd1d4cb3	923	pcb->local_port, pcb->remote_port);
sam_grove	5:3f93dd1d4cb3	924	}
sam_grove	5:3f93dd1d4cb3	925
sam_grove	5:3f93dd1d4cb3	926	pcb2 = pcb;
sam_grove	5:3f93dd1d4cb3	927	pcb = pcb->next;
sam_grove	5:3f93dd1d4cb3	928	memp_free(MEMP_TCP_PCB, pcb2);
sam_grove	5:3f93dd1d4cb3	929	} else {
sam_grove	5:3f93dd1d4cb3	930	/* get the 'next' element now and work with 'prev' below (in case of abort) */
sam_grove	5:3f93dd1d4cb3	931	prev = pcb;
sam_grove	5:3f93dd1d4cb3	932	pcb = pcb->next;
sam_grove	5:3f93dd1d4cb3	933
sam_grove	5:3f93dd1d4cb3	934	/* We check if we should poll the connection. */
sam_grove	5:3f93dd1d4cb3	935	++prev->polltmr;
sam_grove	5:3f93dd1d4cb3	936	if (prev->polltmr >= prev->pollinterval) {
sam_grove	5:3f93dd1d4cb3	937	prev->polltmr = 0;
sam_grove	5:3f93dd1d4cb3	938	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
sam_grove	5:3f93dd1d4cb3	939	TCP_EVENT_POLL(prev, err);
sam_grove	5:3f93dd1d4cb3	940	/* if err == ERR_ABRT, 'prev' is already deallocated */
sam_grove	5:3f93dd1d4cb3	941	if (err == ERR_OK) {
sam_grove	5:3f93dd1d4cb3	942	tcp_output(prev);
sam_grove	5:3f93dd1d4cb3	943	}
sam_grove	5:3f93dd1d4cb3	944	}
sam_grove	5:3f93dd1d4cb3	945	}
sam_grove	5:3f93dd1d4cb3	946	}
sam_grove	5:3f93dd1d4cb3	947
sam_grove	5:3f93dd1d4cb3	948
sam_grove	5:3f93dd1d4cb3	949	/* Steps through all of the TIME-WAIT PCBs. */
sam_grove	5:3f93dd1d4cb3	950	prev = NULL;
sam_grove	5:3f93dd1d4cb3	951	pcb = tcp_tw_pcbs;
sam_grove	5:3f93dd1d4cb3	952	while (pcb != NULL) {
sam_grove	5:3f93dd1d4cb3	953	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
sam_grove	5:3f93dd1d4cb3	954	pcb_remove = 0;
sam_grove	5:3f93dd1d4cb3	955
sam_grove	5:3f93dd1d4cb3	956	/* Check if this PCB has stayed long enough in TIME-WAIT */
sam_grove	5:3f93dd1d4cb3	957	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
sam_grove	5:3f93dd1d4cb3	958	++pcb_remove;
sam_grove	5:3f93dd1d4cb3	959	}
sam_grove	5:3f93dd1d4cb3	960
sam_grove	5:3f93dd1d4cb3	961
sam_grove	5:3f93dd1d4cb3	962
sam_grove	5:3f93dd1d4cb3	963	/* If the PCB should be removed, do it. */
sam_grove	5:3f93dd1d4cb3	964	if (pcb_remove) {
sam_grove	5:3f93dd1d4cb3	965	struct tcp_pcb *pcb2;
sam_grove	5:3f93dd1d4cb3	966	tcp_pcb_purge(pcb);
sam_grove	5:3f93dd1d4cb3	967	/* Remove PCB from tcp_tw_pcbs list. */
sam_grove	5:3f93dd1d4cb3	968	if (prev != NULL) {
sam_grove	5:3f93dd1d4cb3	969	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
sam_grove	5:3f93dd1d4cb3	970	prev->next = pcb->next;
sam_grove	5:3f93dd1d4cb3	971	} else {
sam_grove	5:3f93dd1d4cb3	972	/* This PCB was the first. */
sam_grove	5:3f93dd1d4cb3	973	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
sam_grove	5:3f93dd1d4cb3	974	tcp_tw_pcbs = pcb->next;
sam_grove	5:3f93dd1d4cb3	975	}
sam_grove	5:3f93dd1d4cb3	976	pcb2 = pcb;
sam_grove	5:3f93dd1d4cb3	977	pcb = pcb->next;
sam_grove	5:3f93dd1d4cb3	978	memp_free(MEMP_TCP_PCB, pcb2);
sam_grove	5:3f93dd1d4cb3	979	} else {
sam_grove	5:3f93dd1d4cb3	980	prev = pcb;
sam_grove	5:3f93dd1d4cb3	981	pcb = pcb->next;
sam_grove	5:3f93dd1d4cb3	982	}
sam_grove	5:3f93dd1d4cb3	983	}
sam_grove	5:3f93dd1d4cb3	984	}
sam_grove	5:3f93dd1d4cb3	985
sam_grove	5:3f93dd1d4cb3	986	/**
sam_grove	5:3f93dd1d4cb3	987	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
sam_grove	5:3f93dd1d4cb3	988	* "refused" by upper layer (application) and sends delayed ACKs.
sam_grove	5:3f93dd1d4cb3	989	*
sam_grove	5:3f93dd1d4cb3	990	* Automatically called from tcp_tmr().
sam_grove	5:3f93dd1d4cb3	991	*/
sam_grove	5:3f93dd1d4cb3	992	void
sam_grove	5:3f93dd1d4cb3	993	tcp_fasttmr(void)
sam_grove	5:3f93dd1d4cb3	994	{
sam_grove	5:3f93dd1d4cb3	995	struct tcp_pcb *pcb = tcp_active_pcbs;
sam_grove	5:3f93dd1d4cb3	996
sam_grove	5:3f93dd1d4cb3	997	while(pcb != NULL) {
sam_grove	5:3f93dd1d4cb3	998	struct tcp_pcb *next = pcb->next;
sam_grove	5:3f93dd1d4cb3	999	/* If there is data which was previously "refused" by upper layer */
sam_grove	5:3f93dd1d4cb3	1000	if (pcb->refused_data != NULL) {
sam_grove	5:3f93dd1d4cb3	1001	/* Notify again application with data previously received. */
sam_grove	5:3f93dd1d4cb3	1002	err_t err;
sam_grove	5:3f93dd1d4cb3	1003	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
sam_grove	5:3f93dd1d4cb3	1004	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
sam_grove	5:3f93dd1d4cb3	1005	if (err == ERR_OK) {
sam_grove	5:3f93dd1d4cb3	1006	pcb->refused_data = NULL;
sam_grove	5:3f93dd1d4cb3	1007	} else if (err == ERR_ABRT) {
sam_grove	5:3f93dd1d4cb3	1008	/* if err == ERR_ABRT, 'pcb' is already deallocated */
sam_grove	5:3f93dd1d4cb3	1009	pcb = NULL;
sam_grove	5:3f93dd1d4cb3	1010	}
sam_grove	5:3f93dd1d4cb3	1011	}
sam_grove	5:3f93dd1d4cb3	1012
sam_grove	5:3f93dd1d4cb3	1013	/* send delayed ACKs */
sam_grove	5:3f93dd1d4cb3	1014	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
sam_grove	5:3f93dd1d4cb3	1015	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
sam_grove	5:3f93dd1d4cb3	1016	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	1017	tcp_output(pcb);
sam_grove	5:3f93dd1d4cb3	1018	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
sam_grove	5:3f93dd1d4cb3	1019	}
sam_grove	5:3f93dd1d4cb3	1020
sam_grove	5:3f93dd1d4cb3	1021	pcb = next;
sam_grove	5:3f93dd1d4cb3	1022	}
sam_grove	5:3f93dd1d4cb3	1023	}
sam_grove	5:3f93dd1d4cb3	1024
sam_grove	5:3f93dd1d4cb3	1025	/**
sam_grove	5:3f93dd1d4cb3	1026	* Deallocates a list of TCP segments (tcp_seg structures).
sam_grove	5:3f93dd1d4cb3	1027	*
sam_grove	5:3f93dd1d4cb3	1028	* @param seg tcp_seg list of TCP segments to free
sam_grove	5:3f93dd1d4cb3	1029	*/
sam_grove	5:3f93dd1d4cb3	1030	void
sam_grove	5:3f93dd1d4cb3	1031	tcp_segs_free(struct tcp_seg *seg)
sam_grove	5:3f93dd1d4cb3	1032	{
sam_grove	5:3f93dd1d4cb3	1033	while (seg != NULL) {
sam_grove	5:3f93dd1d4cb3	1034	struct tcp_seg *next = seg->next;
sam_grove	5:3f93dd1d4cb3	1035	tcp_seg_free(seg);
sam_grove	5:3f93dd1d4cb3	1036	seg = next;
sam_grove	5:3f93dd1d4cb3	1037	}
sam_grove	5:3f93dd1d4cb3	1038	}
sam_grove	5:3f93dd1d4cb3	1039
sam_grove	5:3f93dd1d4cb3	1040	/**
sam_grove	5:3f93dd1d4cb3	1041	* Frees a TCP segment (tcp_seg structure).
sam_grove	5:3f93dd1d4cb3	1042	*
sam_grove	5:3f93dd1d4cb3	1043	* @param seg single tcp_seg to free
sam_grove	5:3f93dd1d4cb3	1044	*/
sam_grove	5:3f93dd1d4cb3	1045	void
sam_grove	5:3f93dd1d4cb3	1046	tcp_seg_free(struct tcp_seg *seg)
sam_grove	5:3f93dd1d4cb3	1047	{
sam_grove	5:3f93dd1d4cb3	1048	if (seg != NULL) {
sam_grove	5:3f93dd1d4cb3	1049	if (seg->p != NULL) {
sam_grove	5:3f93dd1d4cb3	1050	pbuf_free(seg->p);
sam_grove	5:3f93dd1d4cb3	1051	#if TCP_DEBUG
sam_grove	5:3f93dd1d4cb3	1052	seg->p = NULL;
sam_grove	5:3f93dd1d4cb3	1053	#endif /* TCP_DEBUG */
sam_grove	5:3f93dd1d4cb3	1054	}
sam_grove	5:3f93dd1d4cb3	1055	memp_free(MEMP_TCP_SEG, seg);
sam_grove	5:3f93dd1d4cb3	1056	}
sam_grove	5:3f93dd1d4cb3	1057	}
sam_grove	5:3f93dd1d4cb3	1058
sam_grove	5:3f93dd1d4cb3	1059	/**
sam_grove	5:3f93dd1d4cb3	1060	* Sets the priority of a connection.
sam_grove	5:3f93dd1d4cb3	1061	*
sam_grove	5:3f93dd1d4cb3	1062	* @param pcb the tcp_pcb to manipulate
sam_grove	5:3f93dd1d4cb3	1063	* @param prio new priority
sam_grove	5:3f93dd1d4cb3	1064	*/
sam_grove	5:3f93dd1d4cb3	1065	void
sam_grove	5:3f93dd1d4cb3	1066	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
sam_grove	5:3f93dd1d4cb3	1067	{
sam_grove	5:3f93dd1d4cb3	1068	pcb->prio = prio;
sam_grove	5:3f93dd1d4cb3	1069	}
sam_grove	5:3f93dd1d4cb3	1070
sam_grove	5:3f93dd1d4cb3	1071	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	1072	/**
sam_grove	5:3f93dd1d4cb3	1073	* Returns a copy of the given TCP segment.
sam_grove	5:3f93dd1d4cb3	1074	* The pbuf and data are not copied, only the pointers
sam_grove	5:3f93dd1d4cb3	1075	*
sam_grove	5:3f93dd1d4cb3	1076	* @param seg the old tcp_seg
sam_grove	5:3f93dd1d4cb3	1077	* @return a copy of seg
sam_grove	5:3f93dd1d4cb3	1078	*/
sam_grove	5:3f93dd1d4cb3	1079	struct tcp_seg *
sam_grove	5:3f93dd1d4cb3	1080	tcp_seg_copy(struct tcp_seg *seg)
sam_grove	5:3f93dd1d4cb3	1081	{
sam_grove	5:3f93dd1d4cb3	1082	struct tcp_seg *cseg;
sam_grove	5:3f93dd1d4cb3	1083
sam_grove	5:3f93dd1d4cb3	1084	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
sam_grove	5:3f93dd1d4cb3	1085	if (cseg == NULL) {
sam_grove	5:3f93dd1d4cb3	1086	return NULL;
sam_grove	5:3f93dd1d4cb3	1087	}
sam_grove	5:3f93dd1d4cb3	1088	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
sam_grove	5:3f93dd1d4cb3	1089	pbuf_ref(cseg->p);
sam_grove	5:3f93dd1d4cb3	1090	return cseg;
sam_grove	5:3f93dd1d4cb3	1091	}
sam_grove	5:3f93dd1d4cb3	1092	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	1093
sam_grove	5:3f93dd1d4cb3	1094	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	1095	/**
sam_grove	5:3f93dd1d4cb3	1096	* Default receive callback that is called if the user didn't register
sam_grove	5:3f93dd1d4cb3	1097	* a recv callback for the pcb.
sam_grove	5:3f93dd1d4cb3	1098	*/
sam_grove	5:3f93dd1d4cb3	1099	err_t
sam_grove	5:3f93dd1d4cb3	1100	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
sam_grove	5:3f93dd1d4cb3	1101	{
sam_grove	5:3f93dd1d4cb3	1102	LWIP_UNUSED_ARG(arg);
sam_grove	5:3f93dd1d4cb3	1103	if (p != NULL) {
sam_grove	5:3f93dd1d4cb3	1104	tcp_recved(pcb, p->tot_len);
sam_grove	5:3f93dd1d4cb3	1105	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	1106	} else if (err == ERR_OK) {
sam_grove	5:3f93dd1d4cb3	1107	return tcp_close(pcb);
sam_grove	5:3f93dd1d4cb3	1108	}
sam_grove	5:3f93dd1d4cb3	1109	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	1110	}
sam_grove	5:3f93dd1d4cb3	1111	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	1112
sam_grove	5:3f93dd1d4cb3	1113	/**
sam_grove	5:3f93dd1d4cb3	1114	* Kills the oldest active connection that has lower priority than prio.
sam_grove	5:3f93dd1d4cb3	1115	*
sam_grove	5:3f93dd1d4cb3	1116	* @param prio minimum priority
sam_grove	5:3f93dd1d4cb3	1117	*/
sam_grove	5:3f93dd1d4cb3	1118	static void
sam_grove	5:3f93dd1d4cb3	1119	tcp_kill_prio(u8_t prio)
sam_grove	5:3f93dd1d4cb3	1120	{
sam_grove	5:3f93dd1d4cb3	1121	struct tcp_pcb pcb, inactive;
sam_grove	5:3f93dd1d4cb3	1122	u32_t inactivity;
sam_grove	5:3f93dd1d4cb3	1123	u8_t mprio;
sam_grove	5:3f93dd1d4cb3	1124
sam_grove	5:3f93dd1d4cb3	1125
sam_grove	5:3f93dd1d4cb3	1126	mprio = TCP_PRIO_MAX;
sam_grove	5:3f93dd1d4cb3	1127
sam_grove	5:3f93dd1d4cb3	1128	/* We kill the oldest active connection that has lower priority than prio. */
sam_grove	5:3f93dd1d4cb3	1129	inactivity = 0;
sam_grove	5:3f93dd1d4cb3	1130	inactive = NULL;
sam_grove	5:3f93dd1d4cb3	1131	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	1132	if (pcb->prio <= prio &&
sam_grove	5:3f93dd1d4cb3	1133	pcb->prio <= mprio &&
sam_grove	5:3f93dd1d4cb3	1134	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
sam_grove	5:3f93dd1d4cb3	1135	inactivity = tcp_ticks - pcb->tmr;
sam_grove	5:3f93dd1d4cb3	1136	inactive = pcb;
sam_grove	5:3f93dd1d4cb3	1137	mprio = pcb->prio;
sam_grove	5:3f93dd1d4cb3	1138	}
sam_grove	5:3f93dd1d4cb3	1139	}
sam_grove	5:3f93dd1d4cb3	1140	if (inactive != NULL) {
sam_grove	5:3f93dd1d4cb3	1141	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
sam_grove	5:3f93dd1d4cb3	1142	(void *)inactive, inactivity));
sam_grove	5:3f93dd1d4cb3	1143	tcp_abort(inactive);
sam_grove	5:3f93dd1d4cb3	1144	}
sam_grove	5:3f93dd1d4cb3	1145	}
sam_grove	5:3f93dd1d4cb3	1146
sam_grove	5:3f93dd1d4cb3	1147	/**
sam_grove	5:3f93dd1d4cb3	1148	* Kills the oldest connection that is in TIME_WAIT state.
sam_grove	5:3f93dd1d4cb3	1149	* Called from tcp_alloc() if no more connections are available.
sam_grove	5:3f93dd1d4cb3	1150	*/
sam_grove	5:3f93dd1d4cb3	1151	static void
sam_grove	5:3f93dd1d4cb3	1152	tcp_kill_timewait(void)
sam_grove	5:3f93dd1d4cb3	1153	{
sam_grove	5:3f93dd1d4cb3	1154	struct tcp_pcb pcb, inactive;
sam_grove	5:3f93dd1d4cb3	1155	u32_t inactivity;
sam_grove	5:3f93dd1d4cb3	1156
sam_grove	5:3f93dd1d4cb3	1157	inactivity = 0;
sam_grove	5:3f93dd1d4cb3	1158	inactive = NULL;
sam_grove	5:3f93dd1d4cb3	1159	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
sam_grove	5:3f93dd1d4cb3	1160	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	1161	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
sam_grove	5:3f93dd1d4cb3	1162	inactivity = tcp_ticks - pcb->tmr;
sam_grove	5:3f93dd1d4cb3	1163	inactive = pcb;
sam_grove	5:3f93dd1d4cb3	1164	}
sam_grove	5:3f93dd1d4cb3	1165	}
sam_grove	5:3f93dd1d4cb3	1166	if (inactive != NULL) {
sam_grove	5:3f93dd1d4cb3	1167	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
sam_grove	5:3f93dd1d4cb3	1168	(void *)inactive, inactivity));
sam_grove	5:3f93dd1d4cb3	1169	tcp_abort(inactive);
sam_grove	5:3f93dd1d4cb3	1170	}
sam_grove	5:3f93dd1d4cb3	1171	}
sam_grove	5:3f93dd1d4cb3	1172
sam_grove	5:3f93dd1d4cb3	1173	/**
sam_grove	5:3f93dd1d4cb3	1174	* Allocate a new tcp_pcb structure.
sam_grove	5:3f93dd1d4cb3	1175	*
sam_grove	5:3f93dd1d4cb3	1176	* @param prio priority for the new pcb
sam_grove	5:3f93dd1d4cb3	1177	* @return a new tcp_pcb that initially is in state CLOSED
sam_grove	5:3f93dd1d4cb3	1178	*/
sam_grove	5:3f93dd1d4cb3	1179	struct tcp_pcb *
sam_grove	5:3f93dd1d4cb3	1180	tcp_alloc(u8_t prio)
sam_grove	5:3f93dd1d4cb3	1181	{
sam_grove	5:3f93dd1d4cb3	1182	struct tcp_pcb *pcb;
sam_grove	5:3f93dd1d4cb3	1183	u32_t iss;
sam_grove	5:3f93dd1d4cb3	1184
sam_grove	5:3f93dd1d4cb3	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
sam_grove	5:3f93dd1d4cb3	1186	if (pcb == NULL) {
sam_grove	5:3f93dd1d4cb3	1187	/* Try killing oldest connection in TIME-WAIT. */
sam_grove	5:3f93dd1d4cb3	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
sam_grove	5:3f93dd1d4cb3	1189	tcp_kill_timewait();
sam_grove	5:3f93dd1d4cb3	1190	/* Try to allocate a tcp_pcb again. */
sam_grove	5:3f93dd1d4cb3	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
sam_grove	5:3f93dd1d4cb3	1192	if (pcb == NULL) {
sam_grove	5:3f93dd1d4cb3	1193	/* Try killing active connections with lower priority than the new one. */
sam_grove	5:3f93dd1d4cb3	1194	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
sam_grove	5:3f93dd1d4cb3	1195	tcp_kill_prio(prio);
sam_grove	5:3f93dd1d4cb3	1196	/* Try to allocate a tcp_pcb again. */
sam_grove	5:3f93dd1d4cb3	1197	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
sam_grove	5:3f93dd1d4cb3	1198	if (pcb != NULL) {
sam_grove	5:3f93dd1d4cb3	1199	/* adjust err stats: memp_malloc failed twice before */
sam_grove	5:3f93dd1d4cb3	1200	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
sam_grove	5:3f93dd1d4cb3	1201	}
sam_grove	5:3f93dd1d4cb3	1202	}
sam_grove	5:3f93dd1d4cb3	1203	if (pcb != NULL) {
sam_grove	5:3f93dd1d4cb3	1204	/* adjust err stats: timewait PCB was freed above */
sam_grove	5:3f93dd1d4cb3	1205	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
sam_grove	5:3f93dd1d4cb3	1206	}
sam_grove	5:3f93dd1d4cb3	1207	}
sam_grove	5:3f93dd1d4cb3	1208	if (pcb != NULL) {
sam_grove	5:3f93dd1d4cb3	1209	memset(pcb, 0, sizeof(struct tcp_pcb));
sam_grove	5:3f93dd1d4cb3	1210	pcb->prio = prio;
sam_grove	5:3f93dd1d4cb3	1211	pcb->snd_buf = TCP_SND_BUF;
sam_grove	5:3f93dd1d4cb3	1212	pcb->snd_queuelen = 0;
sam_grove	5:3f93dd1d4cb3	1213	pcb->rcv_wnd = TCP_WND;
sam_grove	5:3f93dd1d4cb3	1214	pcb->rcv_ann_wnd = TCP_WND;
sam_grove	5:3f93dd1d4cb3	1215	pcb->tos = 0;
sam_grove	5:3f93dd1d4cb3	1216	pcb->ttl = TCP_TTL;
sam_grove	5:3f93dd1d4cb3	1217	/* As initial send MSS, we use TCP_MSS but limit it to 536.
sam_grove	5:3f93dd1d4cb3	1218	The send MSS is updated when an MSS option is received. */
sam_grove	5:3f93dd1d4cb3	1219	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
sam_grove	5:3f93dd1d4cb3	1220	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
sam_grove	5:3f93dd1d4cb3	1221	pcb->sa = 0;
sam_grove	5:3f93dd1d4cb3	1222	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
sam_grove	5:3f93dd1d4cb3	1223	pcb->rtime = -1;
sam_grove	5:3f93dd1d4cb3	1224	pcb->cwnd = 1;
sam_grove	5:3f93dd1d4cb3	1225	iss = tcp_next_iss();
sam_grove	5:3f93dd1d4cb3	1226	pcb->snd_wl2 = iss;
sam_grove	5:3f93dd1d4cb3	1227	pcb->snd_nxt = iss;
sam_grove	5:3f93dd1d4cb3	1228	pcb->lastack = iss;
sam_grove	5:3f93dd1d4cb3	1229	pcb->snd_lbb = iss;
sam_grove	5:3f93dd1d4cb3	1230	pcb->tmr = tcp_ticks;
sam_grove	5:3f93dd1d4cb3	1231
sam_grove	5:3f93dd1d4cb3	1232	pcb->polltmr = 0;
sam_grove	5:3f93dd1d4cb3	1233
sam_grove	5:3f93dd1d4cb3	1234	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	1235	pcb->recv = tcp_recv_null;
sam_grove	5:3f93dd1d4cb3	1236	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	1237
sam_grove	5:3f93dd1d4cb3	1238	/* Init KEEPALIVE timer */
sam_grove	5:3f93dd1d4cb3	1239	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
sam_grove	5:3f93dd1d4cb3	1240
sam_grove	5:3f93dd1d4cb3	1241	#if LWIP_TCP_KEEPALIVE
sam_grove	5:3f93dd1d4cb3	1242	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
sam_grove	5:3f93dd1d4cb3	1243	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
sam_grove	5:3f93dd1d4cb3	1244	#endif /* LWIP_TCP_KEEPALIVE */
sam_grove	5:3f93dd1d4cb3	1245
sam_grove	5:3f93dd1d4cb3	1246	pcb->keep_cnt_sent = 0;
sam_grove	5:3f93dd1d4cb3	1247	}
sam_grove	5:3f93dd1d4cb3	1248	return pcb;
sam_grove	5:3f93dd1d4cb3	1249	}
sam_grove	5:3f93dd1d4cb3	1250
sam_grove	5:3f93dd1d4cb3	1251	/**
sam_grove	5:3f93dd1d4cb3	1252	* Creates a new TCP protocol control block but doesn't place it on
sam_grove	5:3f93dd1d4cb3	1253	* any of the TCP PCB lists.
sam_grove	5:3f93dd1d4cb3	1254	* The pcb is not put on any list until binding using tcp_bind().
sam_grove	5:3f93dd1d4cb3	1255	*
sam_grove	5:3f93dd1d4cb3	1256	* @internal: Maybe there should be a idle TCP PCB list where these
sam_grove	5:3f93dd1d4cb3	1257	* PCBs are put on. Port reservation using tcp_bind() is implemented but
sam_grove	5:3f93dd1d4cb3	1258	* allocated pcbs that are not bound can't be killed automatically if wanting
sam_grove	5:3f93dd1d4cb3	1259	* to allocate a pcb with higher prio (@see tcp_kill_prio())
sam_grove	5:3f93dd1d4cb3	1260	*
sam_grove	5:3f93dd1d4cb3	1261	* @return a new tcp_pcb that initially is in state CLOSED
sam_grove	5:3f93dd1d4cb3	1262	*/
sam_grove	5:3f93dd1d4cb3	1263	struct tcp_pcb *
sam_grove	5:3f93dd1d4cb3	1264	tcp_new(void)
sam_grove	5:3f93dd1d4cb3	1265	{
sam_grove	5:3f93dd1d4cb3	1266	return tcp_alloc(TCP_PRIO_NORMAL);
sam_grove	5:3f93dd1d4cb3	1267	}
sam_grove	5:3f93dd1d4cb3	1268
sam_grove	5:3f93dd1d4cb3	1269	/**
sam_grove	5:3f93dd1d4cb3	1270	* Used to specify the argument that should be passed callback
sam_grove	5:3f93dd1d4cb3	1271	* functions.
sam_grove	5:3f93dd1d4cb3	1272	*
sam_grove	5:3f93dd1d4cb3	1273	* @param pcb tcp_pcb to set the callback argument
sam_grove	5:3f93dd1d4cb3	1274	* @param arg void pointer argument to pass to callback functions
sam_grove	5:3f93dd1d4cb3	1275	*/
sam_grove	5:3f93dd1d4cb3	1276	void
sam_grove	5:3f93dd1d4cb3	1277	tcp_arg(struct tcp_pcb pcb, void arg)
sam_grove	5:3f93dd1d4cb3	1278	{
sam_grove	5:3f93dd1d4cb3	1279	pcb->callback_arg = arg;
sam_grove	5:3f93dd1d4cb3	1280	}
sam_grove	5:3f93dd1d4cb3	1281	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	1282
sam_grove	5:3f93dd1d4cb3	1283	/**
sam_grove	5:3f93dd1d4cb3	1284	* Used to specify the function that should be called when a TCP
sam_grove	5:3f93dd1d4cb3	1285	* connection receives data.
sam_grove	5:3f93dd1d4cb3	1286	*
sam_grove	5:3f93dd1d4cb3	1287	* @param pcb tcp_pcb to set the recv callback
sam_grove	5:3f93dd1d4cb3	1288	* @param recv callback function to call for this pcb when data is received
sam_grove	5:3f93dd1d4cb3	1289	*/
sam_grove	5:3f93dd1d4cb3	1290	void
sam_grove	5:3f93dd1d4cb3	1291	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
sam_grove	5:3f93dd1d4cb3	1292	{
sam_grove	5:3f93dd1d4cb3	1293	pcb->recv = recv;
sam_grove	5:3f93dd1d4cb3	1294	}
sam_grove	5:3f93dd1d4cb3	1295
sam_grove	5:3f93dd1d4cb3	1296	/**
sam_grove	5:3f93dd1d4cb3	1297	* Used to specify the function that should be called when TCP data
sam_grove	5:3f93dd1d4cb3	1298	* has been successfully delivered to the remote host.
sam_grove	5:3f93dd1d4cb3	1299	*
sam_grove	5:3f93dd1d4cb3	1300	* @param pcb tcp_pcb to set the sent callback
sam_grove	5:3f93dd1d4cb3	1301	* @param sent callback function to call for this pcb when data is successfully sent
sam_grove	5:3f93dd1d4cb3	1302	*/
sam_grove	5:3f93dd1d4cb3	1303	void
sam_grove	5:3f93dd1d4cb3	1304	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
sam_grove	5:3f93dd1d4cb3	1305	{
sam_grove	5:3f93dd1d4cb3	1306	pcb->sent = sent;
sam_grove	5:3f93dd1d4cb3	1307	}
sam_grove	5:3f93dd1d4cb3	1308
sam_grove	5:3f93dd1d4cb3	1309	/**
sam_grove	5:3f93dd1d4cb3	1310	* Used to specify the function that should be called when a fatal error
sam_grove	5:3f93dd1d4cb3	1311	* has occured on the connection.
sam_grove	5:3f93dd1d4cb3	1312	*
sam_grove	5:3f93dd1d4cb3	1313	* @param pcb tcp_pcb to set the err callback
sam_grove	5:3f93dd1d4cb3	1314	* @param err callback function to call for this pcb when a fatal error
sam_grove	5:3f93dd1d4cb3	1315	* has occured on the connection
sam_grove	5:3f93dd1d4cb3	1316	*/
sam_grove	5:3f93dd1d4cb3	1317	void
sam_grove	5:3f93dd1d4cb3	1318	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
sam_grove	5:3f93dd1d4cb3	1319	{
sam_grove	5:3f93dd1d4cb3	1320	pcb->errf = err;
sam_grove	5:3f93dd1d4cb3	1321	}
sam_grove	5:3f93dd1d4cb3	1322
sam_grove	5:3f93dd1d4cb3	1323	/**
sam_grove	5:3f93dd1d4cb3	1324	* Used for specifying the function that should be called when a
sam_grove	5:3f93dd1d4cb3	1325	* LISTENing connection has been connected to another host.
sam_grove	5:3f93dd1d4cb3	1326	*
sam_grove	5:3f93dd1d4cb3	1327	* @param pcb tcp_pcb to set the accept callback
sam_grove	5:3f93dd1d4cb3	1328	* @param accept callback function to call for this pcb when LISTENing
sam_grove	5:3f93dd1d4cb3	1329	* connection has been connected to another host
sam_grove	5:3f93dd1d4cb3	1330	*/
sam_grove	5:3f93dd1d4cb3	1331	void
sam_grove	5:3f93dd1d4cb3	1332	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
sam_grove	5:3f93dd1d4cb3	1333	{
sam_grove	5:3f93dd1d4cb3	1334	pcb->accept = accept;
sam_grove	5:3f93dd1d4cb3	1335	}
sam_grove	5:3f93dd1d4cb3	1336	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	1337
sam_grove	5:3f93dd1d4cb3	1338
sam_grove	5:3f93dd1d4cb3	1339	/**
sam_grove	5:3f93dd1d4cb3	1340	* Used to specify the function that should be called periodically
sam_grove	5:3f93dd1d4cb3	1341	* from TCP. The interval is specified in terms of the TCP coarse
sam_grove	5:3f93dd1d4cb3	1342	* timer interval, which is called twice a second.
sam_grove	5:3f93dd1d4cb3	1343	*
sam_grove	5:3f93dd1d4cb3	1344	*/
sam_grove	5:3f93dd1d4cb3	1345	void
sam_grove	5:3f93dd1d4cb3	1346	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
sam_grove	5:3f93dd1d4cb3	1347	{
sam_grove	5:3f93dd1d4cb3	1348	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	1349	pcb->poll = poll;
sam_grove	5:3f93dd1d4cb3	1350	#else /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	1351	LWIP_UNUSED_ARG(poll);
sam_grove	5:3f93dd1d4cb3	1352	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	1353	pcb->pollinterval = interval;
sam_grove	5:3f93dd1d4cb3	1354	}
sam_grove	5:3f93dd1d4cb3	1355
sam_grove	5:3f93dd1d4cb3	1356	/**
sam_grove	5:3f93dd1d4cb3	1357	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
sam_grove	5:3f93dd1d4cb3	1358	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
sam_grove	5:3f93dd1d4cb3	1359	*
sam_grove	5:3f93dd1d4cb3	1360	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
sam_grove	5:3f93dd1d4cb3	1361	*/
sam_grove	5:3f93dd1d4cb3	1362	void
sam_grove	5:3f93dd1d4cb3	1363	tcp_pcb_purge(struct tcp_pcb *pcb)
sam_grove	5:3f93dd1d4cb3	1364	{
sam_grove	5:3f93dd1d4cb3	1365	if (pcb->state != CLOSED &&
sam_grove	5:3f93dd1d4cb3	1366	pcb->state != TIME_WAIT &&
sam_grove	5:3f93dd1d4cb3	1367	pcb->state != LISTEN) {
sam_grove	5:3f93dd1d4cb3	1368
sam_grove	5:3f93dd1d4cb3	1369	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
sam_grove	5:3f93dd1d4cb3	1370
sam_grove	5:3f93dd1d4cb3	1371	#if TCP_LISTEN_BACKLOG
sam_grove	5:3f93dd1d4cb3	1372	if (pcb->state == SYN_RCVD) {
sam_grove	5:3f93dd1d4cb3	1373	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
sam_grove	5:3f93dd1d4cb3	1374	struct tcp_pcb_listen *lpcb;
sam_grove	5:3f93dd1d4cb3	1375	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
sam_grove	5:3f93dd1d4cb3	1376	tcp_listen_pcbs.listen_pcbs != NULL);
sam_grove	5:3f93dd1d4cb3	1377	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
sam_grove	5:3f93dd1d4cb3	1378	if ((lpcb->local_port == pcb->local_port) &&
sam_grove	5:3f93dd1d4cb3	1379	(ip_addr_isany(&lpcb->local_ip) \|\|
sam_grove	5:3f93dd1d4cb3	1380	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
sam_grove	5:3f93dd1d4cb3	1381	/* port and address of the listen pcb match the timed-out pcb */
sam_grove	5:3f93dd1d4cb3	1382	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
sam_grove	5:3f93dd1d4cb3	1383	lpcb->accepts_pending > 0);
sam_grove	5:3f93dd1d4cb3	1384	lpcb->accepts_pending--;
sam_grove	5:3f93dd1d4cb3	1385	break;
sam_grove	5:3f93dd1d4cb3	1386	}
sam_grove	5:3f93dd1d4cb3	1387	}
sam_grove	5:3f93dd1d4cb3	1388	}
sam_grove	5:3f93dd1d4cb3	1389	#endif /* TCP_LISTEN_BACKLOG */
sam_grove	5:3f93dd1d4cb3	1390
sam_grove	5:3f93dd1d4cb3	1391
sam_grove	5:3f93dd1d4cb3	1392	if (pcb->refused_data != NULL) {
sam_grove	5:3f93dd1d4cb3	1393	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
sam_grove	5:3f93dd1d4cb3	1394	pbuf_free(pcb->refused_data);
sam_grove	5:3f93dd1d4cb3	1395	pcb->refused_data = NULL;
sam_grove	5:3f93dd1d4cb3	1396	}
sam_grove	5:3f93dd1d4cb3	1397	if (pcb->unsent != NULL) {
sam_grove	5:3f93dd1d4cb3	1398	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
sam_grove	5:3f93dd1d4cb3	1399	}
sam_grove	5:3f93dd1d4cb3	1400	if (pcb->unacked != NULL) {
sam_grove	5:3f93dd1d4cb3	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
sam_grove	5:3f93dd1d4cb3	1402	}
sam_grove	5:3f93dd1d4cb3	1403	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	1404	if (pcb->ooseq != NULL) {
sam_grove	5:3f93dd1d4cb3	1405	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
sam_grove	5:3f93dd1d4cb3	1406	}
sam_grove	5:3f93dd1d4cb3	1407	tcp_segs_free(pcb->ooseq);
sam_grove	5:3f93dd1d4cb3	1408	pcb->ooseq = NULL;
sam_grove	5:3f93dd1d4cb3	1409	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	1410
sam_grove	5:3f93dd1d4cb3	1411	/* Stop the retransmission timer as it will expect data on unacked
sam_grove	5:3f93dd1d4cb3	1412	queue if it fires */
sam_grove	5:3f93dd1d4cb3	1413	pcb->rtime = -1;
sam_grove	5:3f93dd1d4cb3	1414
sam_grove	5:3f93dd1d4cb3	1415	tcp_segs_free(pcb->unsent);
sam_grove	5:3f93dd1d4cb3	1416	tcp_segs_free(pcb->unacked);
sam_grove	5:3f93dd1d4cb3	1417	pcb->unacked = pcb->unsent = NULL;
sam_grove	5:3f93dd1d4cb3	1418	#if TCP_OVERSIZE
sam_grove	5:3f93dd1d4cb3	1419	pcb->unsent_oversize = 0;
sam_grove	5:3f93dd1d4cb3	1420	#endif /* TCP_OVERSIZE */
sam_grove	5:3f93dd1d4cb3	1421	}
sam_grove	5:3f93dd1d4cb3	1422	}
sam_grove	5:3f93dd1d4cb3	1423
sam_grove	5:3f93dd1d4cb3	1424	/**
sam_grove	5:3f93dd1d4cb3	1425	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
sam_grove	5:3f93dd1d4cb3	1426	*
sam_grove	5:3f93dd1d4cb3	1427	* @param pcblist PCB list to purge.
sam_grove	5:3f93dd1d4cb3	1428	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
sam_grove	5:3f93dd1d4cb3	1429	*/
sam_grove	5:3f93dd1d4cb3	1430	void
sam_grove	5:3f93dd1d4cb3	1431	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
sam_grove	5:3f93dd1d4cb3	1432	{
sam_grove	5:3f93dd1d4cb3	1433	TCP_RMV(pcblist, pcb);
sam_grove	5:3f93dd1d4cb3	1434
sam_grove	5:3f93dd1d4cb3	1435	tcp_pcb_purge(pcb);
sam_grove	5:3f93dd1d4cb3	1436
sam_grove	5:3f93dd1d4cb3	1437	/* if there is an outstanding delayed ACKs, send it */
sam_grove	5:3f93dd1d4cb3	1438	if (pcb->state != TIME_WAIT &&
sam_grove	5:3f93dd1d4cb3	1439	pcb->state != LISTEN &&
sam_grove	5:3f93dd1d4cb3	1440	pcb->flags & TF_ACK_DELAY) {
sam_grove	5:3f93dd1d4cb3	1441	pcb->flags \|= TF_ACK_NOW;
sam_grove	5:3f93dd1d4cb3	1442	tcp_output(pcb);
sam_grove	5:3f93dd1d4cb3	1443	}
sam_grove	5:3f93dd1d4cb3	1444
sam_grove	5:3f93dd1d4cb3	1445	if (pcb->state != LISTEN) {
sam_grove	5:3f93dd1d4cb3	1446	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
sam_grove	5:3f93dd1d4cb3	1447	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
sam_grove	5:3f93dd1d4cb3	1448	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	1449	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
sam_grove	5:3f93dd1d4cb3	1450	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	1451	}
sam_grove	5:3f93dd1d4cb3	1452
sam_grove	5:3f93dd1d4cb3	1453	pcb->state = CLOSED;
sam_grove	5:3f93dd1d4cb3	1454
sam_grove	5:3f93dd1d4cb3	1455	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
sam_grove	5:3f93dd1d4cb3	1456	}
sam_grove	5:3f93dd1d4cb3	1457
sam_grove	5:3f93dd1d4cb3	1458	/**
sam_grove	5:3f93dd1d4cb3	1459	* Calculates a new initial sequence number for new connections.
sam_grove	5:3f93dd1d4cb3	1460	*
sam_grove	5:3f93dd1d4cb3	1461	* @return u32_t pseudo random sequence number
sam_grove	5:3f93dd1d4cb3	1462	*/
sam_grove	5:3f93dd1d4cb3	1463	u32_t
sam_grove	5:3f93dd1d4cb3	1464	tcp_next_iss(void)
sam_grove	5:3f93dd1d4cb3	1465	{
sam_grove	5:3f93dd1d4cb3	1466	static u32_t iss = 6510;
sam_grove	5:3f93dd1d4cb3	1467
sam_grove	5:3f93dd1d4cb3	1468	iss += tcp_ticks; /* XXX */
sam_grove	5:3f93dd1d4cb3	1469	return iss;
sam_grove	5:3f93dd1d4cb3	1470	}
sam_grove	5:3f93dd1d4cb3	1471
sam_grove	5:3f93dd1d4cb3	1472	#if TCP_CALCULATE_EFF_SEND_MSS
sam_grove	5:3f93dd1d4cb3	1473	/**
sam_grove	5:3f93dd1d4cb3	1474	* Calcluates the effective send mss that can be used for a specific IP address
sam_grove	5:3f93dd1d4cb3	1475	* by using ip_route to determin the netif used to send to the address and
sam_grove	5:3f93dd1d4cb3	1476	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
sam_grove	5:3f93dd1d4cb3	1477	*/
sam_grove	5:3f93dd1d4cb3	1478	u16_t
sam_grove	5:3f93dd1d4cb3	1479	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
sam_grove	5:3f93dd1d4cb3	1480	{
sam_grove	5:3f93dd1d4cb3	1481	u16_t mss_s;
sam_grove	5:3f93dd1d4cb3	1482	struct netif *outif;
sam_grove	5:3f93dd1d4cb3	1483
sam_grove	5:3f93dd1d4cb3	1484	outif = ip_route(addr);
sam_grove	5:3f93dd1d4cb3	1485	if ((outif != NULL) && (outif->mtu != 0)) {
sam_grove	5:3f93dd1d4cb3	1486	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
sam_grove	5:3f93dd1d4cb3	1487	/* RFC 1122, chap 4.2.2.6:
sam_grove	5:3f93dd1d4cb3	1488	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
sam_grove	5:3f93dd1d4cb3	1489	* We correct for TCP options in tcp_write(), and don't support IP options.
sam_grove	5:3f93dd1d4cb3	1490	*/
sam_grove	5:3f93dd1d4cb3	1491	sendmss = LWIP_MIN(sendmss, mss_s);
sam_grove	5:3f93dd1d4cb3	1492	}
sam_grove	5:3f93dd1d4cb3	1493	return sendmss;
sam_grove	5:3f93dd1d4cb3	1494	}
sam_grove	5:3f93dd1d4cb3	1495	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
sam_grove	5:3f93dd1d4cb3	1496
sam_grove	5:3f93dd1d4cb3	1497	const char*
sam_grove	5:3f93dd1d4cb3	1498	tcp_debug_state_str(enum tcp_state s)
sam_grove	5:3f93dd1d4cb3	1499	{
sam_grove	5:3f93dd1d4cb3	1500	return tcp_state_str[s];
sam_grove	5:3f93dd1d4cb3	1501	}
sam_grove	5:3f93dd1d4cb3	1502
sam_grove	5:3f93dd1d4cb3	1503	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
sam_grove	5:3f93dd1d4cb3	1504	/**
sam_grove	5:3f93dd1d4cb3	1505	* Print a tcp header for debugging purposes.
sam_grove	5:3f93dd1d4cb3	1506	*
sam_grove	5:3f93dd1d4cb3	1507	* @param tcphdr pointer to a struct tcp_hdr
sam_grove	5:3f93dd1d4cb3	1508	*/
sam_grove	5:3f93dd1d4cb3	1509	void
sam_grove	5:3f93dd1d4cb3	1510	tcp_debug_print(struct tcp_hdr *tcphdr)
sam_grove	5:3f93dd1d4cb3	1511	{
sam_grove	5:3f93dd1d4cb3	1512	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
sam_grove	5:3f93dd1d4cb3	1513	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
sam_grove	5:3f93dd1d4cb3	1514	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
sam_grove	5:3f93dd1d4cb3	1515	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
sam_grove	5:3f93dd1d4cb3	1516	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
sam_grove	5:3f93dd1d4cb3	1517	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
sam_grove	5:3f93dd1d4cb3	1518	ntohl(tcphdr->seqno)));
sam_grove	5:3f93dd1d4cb3	1519	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
sam_grove	5:3f93dd1d4cb3	1520	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
sam_grove	5:3f93dd1d4cb3	1521	ntohl(tcphdr->ackno)));
sam_grove	5:3f93dd1d4cb3	1522	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
sam_grove	5:3f93dd1d4cb3	1523	LWIP_DEBUGF(TCP_DEBUG, ("\| %2"U16_F" \| \|%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"\| %5"U16_F" \| (hdrlen, flags (",
sam_grove	5:3f93dd1d4cb3	1524	TCPH_HDRLEN(tcphdr),
sam_grove	5:3f93dd1d4cb3	1525	TCPH_FLAGS(tcphdr) >> 5 & 1,
sam_grove	5:3f93dd1d4cb3	1526	TCPH_FLAGS(tcphdr) >> 4 & 1,
sam_grove	5:3f93dd1d4cb3	1527	TCPH_FLAGS(tcphdr) >> 3 & 1,
sam_grove	5:3f93dd1d4cb3	1528	TCPH_FLAGS(tcphdr) >> 2 & 1,
sam_grove	5:3f93dd1d4cb3	1529	TCPH_FLAGS(tcphdr) >> 1 & 1,
sam_grove	5:3f93dd1d4cb3	1530	TCPH_FLAGS(tcphdr) & 1,
sam_grove	5:3f93dd1d4cb3	1531	ntohs(tcphdr->wnd)));
sam_grove	5:3f93dd1d4cb3	1532	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
sam_grove	5:3f93dd1d4cb3	1533	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
sam_grove	5:3f93dd1d4cb3	1534	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
sam_grove	5:3f93dd1d4cb3	1535	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
sam_grove	5:3f93dd1d4cb3	1536	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
sam_grove	5:3f93dd1d4cb3	1537	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
sam_grove	5:3f93dd1d4cb3	1538	}
sam_grove	5:3f93dd1d4cb3	1539
sam_grove	5:3f93dd1d4cb3	1540	/**
sam_grove	5:3f93dd1d4cb3	1541	* Print a tcp state for debugging purposes.
sam_grove	5:3f93dd1d4cb3	1542	*
sam_grove	5:3f93dd1d4cb3	1543	* @param s enum tcp_state to print
sam_grove	5:3f93dd1d4cb3	1544	*/
sam_grove	5:3f93dd1d4cb3	1545	void
sam_grove	5:3f93dd1d4cb3	1546	tcp_debug_print_state(enum tcp_state s)
sam_grove	5:3f93dd1d4cb3	1547	{
sam_grove	5:3f93dd1d4cb3	1548	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
sam_grove	5:3f93dd1d4cb3	1549	}
sam_grove	5:3f93dd1d4cb3	1550
sam_grove	5:3f93dd1d4cb3	1551	/**
sam_grove	5:3f93dd1d4cb3	1552	* Print tcp flags for debugging purposes.
sam_grove	5:3f93dd1d4cb3	1553	*
sam_grove	5:3f93dd1d4cb3	1554	* @param flags tcp flags, all active flags are printed
sam_grove	5:3f93dd1d4cb3	1555	*/
sam_grove	5:3f93dd1d4cb3	1556	void
sam_grove	5:3f93dd1d4cb3	1557	tcp_debug_print_flags(u8_t flags)
sam_grove	5:3f93dd1d4cb3	1558	{
sam_grove	5:3f93dd1d4cb3	1559	if (flags & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	1560	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
sam_grove	5:3f93dd1d4cb3	1561	}
sam_grove	5:3f93dd1d4cb3	1562	if (flags & TCP_SYN) {
sam_grove	5:3f93dd1d4cb3	1563	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
sam_grove	5:3f93dd1d4cb3	1564	}
sam_grove	5:3f93dd1d4cb3	1565	if (flags & TCP_RST) {
sam_grove	5:3f93dd1d4cb3	1566	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
sam_grove	5:3f93dd1d4cb3	1567	}
sam_grove	5:3f93dd1d4cb3	1568	if (flags & TCP_PSH) {
sam_grove	5:3f93dd1d4cb3	1569	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
sam_grove	5:3f93dd1d4cb3	1570	}
sam_grove	5:3f93dd1d4cb3	1571	if (flags & TCP_ACK) {
sam_grove	5:3f93dd1d4cb3	1572	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
sam_grove	5:3f93dd1d4cb3	1573	}
sam_grove	5:3f93dd1d4cb3	1574	if (flags & TCP_URG) {
sam_grove	5:3f93dd1d4cb3	1575	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
sam_grove	5:3f93dd1d4cb3	1576	}
sam_grove	5:3f93dd1d4cb3	1577	if (flags & TCP_ECE) {
sam_grove	5:3f93dd1d4cb3	1578	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
sam_grove	5:3f93dd1d4cb3	1579	}
sam_grove	5:3f93dd1d4cb3	1580	if (flags & TCP_CWR) {
sam_grove	5:3f93dd1d4cb3	1581	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
sam_grove	5:3f93dd1d4cb3	1582	}
sam_grove	5:3f93dd1d4cb3	1583	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
sam_grove	5:3f93dd1d4cb3	1584	}
sam_grove	5:3f93dd1d4cb3	1585
sam_grove	5:3f93dd1d4cb3	1586	/**
sam_grove	5:3f93dd1d4cb3	1587	* Print all tcp_pcbs in every list for debugging purposes.
sam_grove	5:3f93dd1d4cb3	1588	*/
sam_grove	5:3f93dd1d4cb3	1589	void
sam_grove	5:3f93dd1d4cb3	1590	tcp_debug_print_pcbs(void)
sam_grove	5:3f93dd1d4cb3	1591	{
sam_grove	5:3f93dd1d4cb3	1592	struct tcp_pcb *pcb;
sam_grove	5:3f93dd1d4cb3	1593	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
sam_grove	5:3f93dd1d4cb3	1594	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	1595	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
sam_grove	5:3f93dd1d4cb3	1596	pcb->local_port, pcb->remote_port,
sam_grove	5:3f93dd1d4cb3	1597	pcb->snd_nxt, pcb->rcv_nxt));
sam_grove	5:3f93dd1d4cb3	1598	tcp_debug_print_state(pcb->state);
sam_grove	5:3f93dd1d4cb3	1599	}
sam_grove	5:3f93dd1d4cb3	1600	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
sam_grove	5:3f93dd1d4cb3	1601	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	1602	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
sam_grove	5:3f93dd1d4cb3	1603	pcb->local_port, pcb->remote_port,
sam_grove	5:3f93dd1d4cb3	1604	pcb->snd_nxt, pcb->rcv_nxt));
sam_grove	5:3f93dd1d4cb3	1605	tcp_debug_print_state(pcb->state);
sam_grove	5:3f93dd1d4cb3	1606	}
sam_grove	5:3f93dd1d4cb3	1607	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
sam_grove	5:3f93dd1d4cb3	1608	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	1609	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
sam_grove	5:3f93dd1d4cb3	1610	pcb->local_port, pcb->remote_port,
sam_grove	5:3f93dd1d4cb3	1611	pcb->snd_nxt, pcb->rcv_nxt));
sam_grove	5:3f93dd1d4cb3	1612	tcp_debug_print_state(pcb->state);
sam_grove	5:3f93dd1d4cb3	1613	}
sam_grove	5:3f93dd1d4cb3	1614	}
sam_grove	5:3f93dd1d4cb3	1615
sam_grove	5:3f93dd1d4cb3	1616	/**
sam_grove	5:3f93dd1d4cb3	1617	* Check state consistency of the tcp_pcb lists.
sam_grove	5:3f93dd1d4cb3	1618	*/
sam_grove	5:3f93dd1d4cb3	1619	s16_t
sam_grove	5:3f93dd1d4cb3	1620	tcp_pcbs_sane(void)
sam_grove	5:3f93dd1d4cb3	1621	{
sam_grove	5:3f93dd1d4cb3	1622	struct tcp_pcb *pcb;
sam_grove	5:3f93dd1d4cb3	1623	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	1624	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
sam_grove	5:3f93dd1d4cb3	1625	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
sam_grove	5:3f93dd1d4cb3	1626	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
sam_grove	5:3f93dd1d4cb3	1627	}
sam_grove	5:3f93dd1d4cb3	1628	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	1629	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
sam_grove	5:3f93dd1d4cb3	1630	}
sam_grove	5:3f93dd1d4cb3	1631	return 1;
sam_grove	5:3f93dd1d4cb3	1632	}
sam_grove	5:3f93dd1d4cb3	1633	#endif /* TCP_DEBUG */
sam_grove	5:3f93dd1d4cb3	1634
sam_grove	5:3f93dd1d4cb3	1635	#endif /* LWIP_TCP */