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lwip/core/tcp.c@0:d616ece2d859, 2010-09-18 (annotated)

Committer:: mbed714
Date:: Sat Sep 18 23:05:49 2010 +0000
Revision:: 0:d616ece2d859

Who changed what in which revision?

User	Revision	Line number	New contents of line
mbed714	0:d616ece2d859	1	/**
mbed714	0:d616ece2d859	2	* @file
mbed714	0:d616ece2d859	3	* Transmission Control Protocol for IP
mbed714	0:d616ece2d859	4	*
mbed714	0:d616ece2d859	5	* This file contains common functions for the TCP implementation, such as functinos
mbed714	0:d616ece2d859	6	* for manipulating the data structures and the TCP timer functions. TCP functions
mbed714	0:d616ece2d859	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
mbed714	0:d616ece2d859	8	*
mbed714	0:d616ece2d859	9	*/
mbed714	0:d616ece2d859	10
mbed714	0:d616ece2d859	11	/*
mbed714	0:d616ece2d859	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed714	0:d616ece2d859	13	* All rights reserved.
mbed714	0:d616ece2d859	14	*
mbed714	0:d616ece2d859	15	* Redistribution and use in source and binary forms, with or without modification,
mbed714	0:d616ece2d859	16	* are permitted provided that the following conditions are met:
mbed714	0:d616ece2d859	17	*
mbed714	0:d616ece2d859	18	* 1. Redistributions of source code must retain the above copyright notice,
mbed714	0:d616ece2d859	19	* this list of conditions and the following disclaimer.
mbed714	0:d616ece2d859	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
mbed714	0:d616ece2d859	21	* this list of conditions and the following disclaimer in the documentation
mbed714	0:d616ece2d859	22	* and/or other materials provided with the distribution.
mbed714	0:d616ece2d859	23	* 3. The name of the author may not be used to endorse or promote products
mbed714	0:d616ece2d859	24	* derived from this software without specific prior written permission.
mbed714	0:d616ece2d859	25	*
mbed714	0:d616ece2d859	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed714	0:d616ece2d859	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed714	0:d616ece2d859	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed714	0:d616ece2d859	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed714	0:d616ece2d859	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed714	0:d616ece2d859	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed714	0:d616ece2d859	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed714	0:d616ece2d859	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed714	0:d616ece2d859	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed714	0:d616ece2d859	35	* OF SUCH DAMAGE.
mbed714	0:d616ece2d859	36	*
mbed714	0:d616ece2d859	37	* This file is part of the lwIP TCP/IP stack.
mbed714	0:d616ece2d859	38	*
mbed714	0:d616ece2d859	39	* Author: Adam Dunkels <adam@sics.se>
mbed714	0:d616ece2d859	40	*
mbed714	0:d616ece2d859	41	*/
mbed714	0:d616ece2d859	42
mbed714	0:d616ece2d859	43	#include "lwip/opt.h"
mbed714	0:d616ece2d859	44
mbed714	0:d616ece2d859	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
mbed714	0:d616ece2d859	46
mbed714	0:d616ece2d859	47	#include "lwip/def.h"
mbed714	0:d616ece2d859	48	#include "lwip/mem.h"
mbed714	0:d616ece2d859	49	#include "lwip/memp.h"
mbed714	0:d616ece2d859	50	#include "lwip/snmp.h"
mbed714	0:d616ece2d859	51	#include "lwip/tcp.h"
mbed714	0:d616ece2d859	52	#include "lwip/tcp_impl.h"
mbed714	0:d616ece2d859	53	#include "lwip/debug.h"
mbed714	0:d616ece2d859	54	#include "lwip/stats.h"
mbed714	0:d616ece2d859	55
mbed714	0:d616ece2d859	56	#include <string.h>
mbed714	0:d616ece2d859	57
mbed714	0:d616ece2d859	58	const char * const tcp_state_str[] = {
mbed714	0:d616ece2d859	59	"CLOSED",
mbed714	0:d616ece2d859	60	"LISTEN",
mbed714	0:d616ece2d859	61	"SYN_SENT",
mbed714	0:d616ece2d859	62	"SYN_RCVD",
mbed714	0:d616ece2d859	63	"ESTABLISHED",
mbed714	0:d616ece2d859	64	"FIN_WAIT_1",
mbed714	0:d616ece2d859	65	"FIN_WAIT_2",
mbed714	0:d616ece2d859	66	"CLOSE_WAIT",
mbed714	0:d616ece2d859	67	"CLOSING",
mbed714	0:d616ece2d859	68	"LAST_ACK",
mbed714	0:d616ece2d859	69	"TIME_WAIT"
mbed714	0:d616ece2d859	70	};
mbed714	0:d616ece2d859	71
mbed714	0:d616ece2d859	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
mbed714	0:d616ece2d859	73	u32_t tcp_ticks;
mbed714	0:d616ece2d859	74	const u8_t tcp_backoff[13] =
mbed714	0:d616ece2d859	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
mbed714	0:d616ece2d859	76	/* Times per slowtmr hits */
mbed714	0:d616ece2d859	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
mbed714	0:d616ece2d859	78
mbed714	0:d616ece2d859	79	/* The TCP PCB lists. */
mbed714	0:d616ece2d859	80
mbed714	0:d616ece2d859	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
mbed714	0:d616ece2d859	82	struct tcp_pcb *tcp_bound_pcbs;
mbed714	0:d616ece2d859	83	/** List of all TCP PCBs in LISTEN state */
mbed714	0:d616ece2d859	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
mbed714	0:d616ece2d859	85	/** List of all TCP PCBs that are in a state in which
mbed714	0:d616ece2d859	86	* they accept or send data. */
mbed714	0:d616ece2d859	87	struct tcp_pcb *tcp_active_pcbs;
mbed714	0:d616ece2d859	88	/** List of all TCP PCBs in TIME-WAIT state */
mbed714	0:d616ece2d859	89	struct tcp_pcb *tcp_tw_pcbs;
mbed714	0:d616ece2d859	90
mbed714	0:d616ece2d859	91	#define NUM_TCP_PCB_LISTS 4
mbed714	0:d616ece2d859	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
mbed714	0:d616ece2d859	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
mbed714	0:d616ece2d859	94	struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
mbed714	0:d616ece2d859	95	&tcp_active_pcbs, &tcp_tw_pcbs};
mbed714	0:d616ece2d859	96
mbed714	0:d616ece2d859	97	/** Only used for temporary storage. */
mbed714	0:d616ece2d859	98	struct tcp_pcb *tcp_tmp_pcb;
mbed714	0:d616ece2d859	99
mbed714	0:d616ece2d859	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
mbed714	0:d616ece2d859	101	static u8_t tcp_timer;
mbed714	0:d616ece2d859	102	static u16_t tcp_new_port(void);
mbed714	0:d616ece2d859	103
mbed714	0:d616ece2d859	104	/**
mbed714	0:d616ece2d859	105	* Called periodically to dispatch TCP timers.
mbed714	0:d616ece2d859	106	*
mbed714	0:d616ece2d859	107	*/
mbed714	0:d616ece2d859	108	void
mbed714	0:d616ece2d859	109	tcp_tmr(void)
mbed714	0:d616ece2d859	110	{
mbed714	0:d616ece2d859	111	/* Call tcp_fasttmr() every 250 ms */
mbed714	0:d616ece2d859	112	tcp_fasttmr();
mbed714	0:d616ece2d859	113
mbed714	0:d616ece2d859	114	if (++tcp_timer & 1) {
mbed714	0:d616ece2d859	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
mbed714	0:d616ece2d859	116	tcp_tmr() is called. */
mbed714	0:d616ece2d859	117	tcp_slowtmr();
mbed714	0:d616ece2d859	118	}
mbed714	0:d616ece2d859	119	}
mbed714	0:d616ece2d859	120
mbed714	0:d616ece2d859	121	/**
mbed714	0:d616ece2d859	122	* Closes the TX side of a connection held by the PCB.
mbed714	0:d616ece2d859	123	* For tcp_close(), a RST is sent if the application didn't receive all data
mbed714	0:d616ece2d859	124	* (tcp_recved() not called for all data passed to recv callback).
mbed714	0:d616ece2d859	125	*
mbed714	0:d616ece2d859	126	* Listening pcbs are freed and may not be referenced any more.
mbed714	0:d616ece2d859	127	* Connection pcbs are freed if not yet connected and may not be referenced
mbed714	0:d616ece2d859	128	* any more. If a connection is established (at least SYN received or in
mbed714	0:d616ece2d859	129	* a closing state), the connection is closed, and put in a closing state.
mbed714	0:d616ece2d859	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
mbed714	0:d616ece2d859	131	* unsafe to reference it.
mbed714	0:d616ece2d859	132	*
mbed714	0:d616ece2d859	133	* @param pcb the tcp_pcb to close
mbed714	0:d616ece2d859	134	* @return ERR_OK if connection has been closed
mbed714	0:d616ece2d859	135	* another err_t if closing failed and pcb is not freed
mbed714	0:d616ece2d859	136	*/
mbed714	0:d616ece2d859	137	static err_t
mbed714	0:d616ece2d859	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
mbed714	0:d616ece2d859	139	{
mbed714	0:d616ece2d859	140	err_t err;
mbed714	0:d616ece2d859	141
mbed714	0:d616ece2d859	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
mbed714	0:d616ece2d859	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
mbed714	0:d616ece2d859	144	/* Not all data received by application, send RST to tell the remote
mbed714	0:d616ece2d859	145	side about this. */
mbed714	0:d616ece2d859	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
mbed714	0:d616ece2d859	147
mbed714	0:d616ece2d859	148	/* don't call tcp_abort here: we must not deallocate the pcb since
mbed714	0:d616ece2d859	149	that might not be expected when calling tcp_close */
mbed714	0:d616ece2d859	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
mbed714	0:d616ece2d859	151	pcb->local_port, pcb->remote_port);
mbed714	0:d616ece2d859	152
mbed714	0:d616ece2d859	153	tcp_pcb_purge(pcb);
mbed714	0:d616ece2d859	154
mbed714	0:d616ece2d859	155	/* TODO: to which state do we move now? */
mbed714	0:d616ece2d859	156
mbed714	0:d616ece2d859	157	/* move to TIME_WAIT since we close actively */
mbed714	0:d616ece2d859	158	TCP_RMV(&tcp_active_pcbs, pcb);
mbed714	0:d616ece2d859	159	pcb->state = TIME_WAIT;
mbed714	0:d616ece2d859	160	TCP_REG(&tcp_tw_pcbs, pcb);
mbed714	0:d616ece2d859	161
mbed714	0:d616ece2d859	162	return ERR_OK;
mbed714	0:d616ece2d859	163	}
mbed714	0:d616ece2d859	164	}
mbed714	0:d616ece2d859	165
mbed714	0:d616ece2d859	166	switch (pcb->state) {
mbed714	0:d616ece2d859	167	case CLOSED:
mbed714	0:d616ece2d859	168	/* Closing a pcb in the CLOSED state might seem erroneous,
mbed714	0:d616ece2d859	169	* however, it is in this state once allocated and as yet unused
mbed714	0:d616ece2d859	170	* and the user needs some way to free it should the need arise.
mbed714	0:d616ece2d859	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
mbed714	0:d616ece2d859	172	* or for a pcb that has been used and then entered the CLOSED state
mbed714	0:d616ece2d859	173	* is erroneous, but this should never happen as the pcb has in those cases
mbed714	0:d616ece2d859	174	* been freed, and so any remaining handles are bogus. */
mbed714	0:d616ece2d859	175	err = ERR_OK;
mbed714	0:d616ece2d859	176	TCP_RMV(&tcp_bound_pcbs, pcb);
mbed714	0:d616ece2d859	177	memp_free(MEMP_TCP_PCB, pcb);
mbed714	0:d616ece2d859	178	pcb = NULL;
mbed714	0:d616ece2d859	179	break;
mbed714	0:d616ece2d859	180	case LISTEN:
mbed714	0:d616ece2d859	181	err = ERR_OK;
mbed714	0:d616ece2d859	182	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
mbed714	0:d616ece2d859	183	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
mbed714	0:d616ece2d859	184	pcb = NULL;
mbed714	0:d616ece2d859	185	break;
mbed714	0:d616ece2d859	186	case SYN_SENT:
mbed714	0:d616ece2d859	187	err = ERR_OK;
mbed714	0:d616ece2d859	188	tcp_pcb_remove(&tcp_active_pcbs, pcb);
mbed714	0:d616ece2d859	189	memp_free(MEMP_TCP_PCB, pcb);
mbed714	0:d616ece2d859	190	pcb = NULL;
mbed714	0:d616ece2d859	191	snmp_inc_tcpattemptfails();
mbed714	0:d616ece2d859	192	break;
mbed714	0:d616ece2d859	193	case SYN_RCVD:
mbed714	0:d616ece2d859	194	err = tcp_send_fin(pcb);
mbed714	0:d616ece2d859	195	if (err == ERR_OK) {
mbed714	0:d616ece2d859	196	snmp_inc_tcpattemptfails();
mbed714	0:d616ece2d859	197	pcb->state = FIN_WAIT_1;
mbed714	0:d616ece2d859	198	}
mbed714	0:d616ece2d859	199	break;
mbed714	0:d616ece2d859	200	case ESTABLISHED:
mbed714	0:d616ece2d859	201	err = tcp_send_fin(pcb);
mbed714	0:d616ece2d859	202	if (err == ERR_OK) {
mbed714	0:d616ece2d859	203	snmp_inc_tcpestabresets();
mbed714	0:d616ece2d859	204	pcb->state = FIN_WAIT_1;
mbed714	0:d616ece2d859	205	}
mbed714	0:d616ece2d859	206	break;
mbed714	0:d616ece2d859	207	case CLOSE_WAIT:
mbed714	0:d616ece2d859	208	err = tcp_send_fin(pcb);
mbed714	0:d616ece2d859	209	if (err == ERR_OK) {
mbed714	0:d616ece2d859	210	snmp_inc_tcpestabresets();
mbed714	0:d616ece2d859	211	pcb->state = LAST_ACK;
mbed714	0:d616ece2d859	212	}
mbed714	0:d616ece2d859	213	break;
mbed714	0:d616ece2d859	214	default:
mbed714	0:d616ece2d859	215	/* Has already been closed, do nothing. */
mbed714	0:d616ece2d859	216	err = ERR_OK;
mbed714	0:d616ece2d859	217	pcb = NULL;
mbed714	0:d616ece2d859	218	break;
mbed714	0:d616ece2d859	219	}
mbed714	0:d616ece2d859	220
mbed714	0:d616ece2d859	221	if (pcb != NULL && err == ERR_OK) {
mbed714	0:d616ece2d859	222	/* To ensure all data has been sent when tcp_close returns, we have
mbed714	0:d616ece2d859	223	to make sure tcp_output doesn't fail.
mbed714	0:d616ece2d859	224	Since we don't really have to ensure all data has been sent when tcp_close
mbed714	0:d616ece2d859	225	returns (unsent data is sent from tcp timer functions, also), we don't care
mbed714	0:d616ece2d859	226	for the return value of tcp_output for now. */
mbed714	0:d616ece2d859	227	/* @todo: When implementing SO_LINGER, this must be changed somehow:
mbed714	0:d616ece2d859	228	If SOF_LINGER is set, the data should be sent and acked before close returns.
mbed714	0:d616ece2d859	229	This can only be valid for sequential APIs, not for the raw API. */
mbed714	0:d616ece2d859	230	tcp_output(pcb);
mbed714	0:d616ece2d859	231	}
mbed714	0:d616ece2d859	232	return err;
mbed714	0:d616ece2d859	233	}
mbed714	0:d616ece2d859	234
mbed714	0:d616ece2d859	235	/**
mbed714	0:d616ece2d859	236	* Closes the connection held by the PCB.
mbed714	0:d616ece2d859	237	*
mbed714	0:d616ece2d859	238	* Listening pcbs are freed and may not be referenced any more.
mbed714	0:d616ece2d859	239	* Connection pcbs are freed if not yet connected and may not be referenced
mbed714	0:d616ece2d859	240	* any more. If a connection is established (at least SYN received or in
mbed714	0:d616ece2d859	241	* a closing state), the connection is closed, and put in a closing state.
mbed714	0:d616ece2d859	242	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
mbed714	0:d616ece2d859	243	* unsafe to reference it (unless an error is returned).
mbed714	0:d616ece2d859	244	*
mbed714	0:d616ece2d859	245	* @param pcb the tcp_pcb to close
mbed714	0:d616ece2d859	246	* @return ERR_OK if connection has been closed
mbed714	0:d616ece2d859	247	* another err_t if closing failed and pcb is not freed
mbed714	0:d616ece2d859	248	*/
mbed714	0:d616ece2d859	249	err_t
mbed714	0:d616ece2d859	250	tcp_close(struct tcp_pcb *pcb)
mbed714	0:d616ece2d859	251	{
mbed714	0:d616ece2d859	252	#if TCP_DEBUG
mbed714	0:d616ece2d859	253	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
mbed714	0:d616ece2d859	254	tcp_debug_print_state(pcb->state);
mbed714	0:d616ece2d859	255	#endif /* TCP_DEBUG */
mbed714	0:d616ece2d859	256
mbed714	0:d616ece2d859	257	if (pcb->state != LISTEN) {
mbed714	0:d616ece2d859	258	/* Set a flag not to receive any more data... */
mbed714	0:d616ece2d859	259	pcb->flags \|= TF_RXCLOSED;
mbed714	0:d616ece2d859	260	}
mbed714	0:d616ece2d859	261	/* ... and close */
mbed714	0:d616ece2d859	262	return tcp_close_shutdown(pcb, 1);
mbed714	0:d616ece2d859	263	}
mbed714	0:d616ece2d859	264
mbed714	0:d616ece2d859	265	/**
mbed714	0:d616ece2d859	266	* Causes all or part of a full-duplex connection of this PCB to be shut down.
mbed714	0:d616ece2d859	267	* This doesn't deallocate the PCB!
mbed714	0:d616ece2d859	268	*
mbed714	0:d616ece2d859	269	* @param pcb PCB to shutdown
mbed714	0:d616ece2d859	270	* @param shut_rx shut down receive side if this is != 0
mbed714	0:d616ece2d859	271	* @param shut_tx shut down send side if this is != 0
mbed714	0:d616ece2d859	272	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
mbed714	0:d616ece2d859	273	* another err_t on error.
mbed714	0:d616ece2d859	274	*/
mbed714	0:d616ece2d859	275	err_t
mbed714	0:d616ece2d859	276	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
mbed714	0:d616ece2d859	277	{
mbed714	0:d616ece2d859	278	if (pcb->state == LISTEN) {
mbed714	0:d616ece2d859	279	return ERR_CONN;
mbed714	0:d616ece2d859	280	}
mbed714	0:d616ece2d859	281	if (shut_rx) {
mbed714	0:d616ece2d859	282	/* shut down the receive side: free buffered data... */
mbed714	0:d616ece2d859	283	if (pcb->refused_data != NULL) {
mbed714	0:d616ece2d859	284	pbuf_free(pcb->refused_data);
mbed714	0:d616ece2d859	285	pcb->refused_data = NULL;
mbed714	0:d616ece2d859	286	}
mbed714	0:d616ece2d859	287	/* ... and set a flag not to receive any more data */
mbed714	0:d616ece2d859	288	pcb->flags \|= TF_RXCLOSED;
mbed714	0:d616ece2d859	289	}
mbed714	0:d616ece2d859	290	if (shut_tx) {
mbed714	0:d616ece2d859	291	/* This can't happen twice since if it succeeds, the pcb's state is changed.
mbed714	0:d616ece2d859	292	Only close in these states as the others directly deallocate the PCB */
mbed714	0:d616ece2d859	293	switch (pcb->state) {
mbed714	0:d616ece2d859	294	case SYN_RCVD:
mbed714	0:d616ece2d859	295	case ESTABLISHED:
mbed714	0:d616ece2d859	296	case CLOSE_WAIT:
mbed714	0:d616ece2d859	297	return tcp_close_shutdown(pcb, 0);
mbed714	0:d616ece2d859	298	default:
mbed714	0:d616ece2d859	299	/* don't shut down other states */
mbed714	0:d616ece2d859	300	break;
mbed714	0:d616ece2d859	301	}
mbed714	0:d616ece2d859	302	}
mbed714	0:d616ece2d859	303	/* @todo: return another err_t if not in correct state or already shut? */
mbed714	0:d616ece2d859	304	return ERR_OK;
mbed714	0:d616ece2d859	305	}
mbed714	0:d616ece2d859	306
mbed714	0:d616ece2d859	307	/**
mbed714	0:d616ece2d859	308	* Abandons a connection and optionally sends a RST to the remote
mbed714	0:d616ece2d859	309	* host. Deletes the local protocol control block. This is done when
mbed714	0:d616ece2d859	310	* a connection is killed because of shortage of memory.
mbed714	0:d616ece2d859	311	*
mbed714	0:d616ece2d859	312	* @param pcb the tcp_pcb to abort
mbed714	0:d616ece2d859	313	* @param reset boolean to indicate whether a reset should be sent
mbed714	0:d616ece2d859	314	*/
mbed714	0:d616ece2d859	315	void
mbed714	0:d616ece2d859	316	tcp_abandon(struct tcp_pcb *pcb, int reset)
mbed714	0:d616ece2d859	317	{
mbed714	0:d616ece2d859	318	u32_t seqno, ackno;
mbed714	0:d616ece2d859	319	u16_t remote_port, local_port;
mbed714	0:d616ece2d859	320	ip_addr_t remote_ip, local_ip;
mbed714	0:d616ece2d859	321	#if LWIP_CALLBACK_API
mbed714	0:d616ece2d859	322	tcp_err_fn errf;
mbed714	0:d616ece2d859	323	#endif /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	324	void *errf_arg;
mbed714	0:d616ece2d859	325
mbed714	0:d616ece2d859	326	/* pcb->state LISTEN not allowed here */
mbed714	0:d616ece2d859	327	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
mbed714	0:d616ece2d859	328	pcb->state != LISTEN);
mbed714	0:d616ece2d859	329	/* Figure out on which TCP PCB list we are, and remove us. If we
mbed714	0:d616ece2d859	330	are in an active state, call the receive function associated with
mbed714	0:d616ece2d859	331	the PCB with a NULL argument, and send an RST to the remote end. */
mbed714	0:d616ece2d859	332	if (pcb->state == TIME_WAIT) {
mbed714	0:d616ece2d859	333	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
mbed714	0:d616ece2d859	334	memp_free(MEMP_TCP_PCB, pcb);
mbed714	0:d616ece2d859	335	} else {
mbed714	0:d616ece2d859	336	seqno = pcb->snd_nxt;
mbed714	0:d616ece2d859	337	ackno = pcb->rcv_nxt;
mbed714	0:d616ece2d859	338	ip_addr_copy(local_ip, pcb->local_ip);
mbed714	0:d616ece2d859	339	ip_addr_copy(remote_ip, pcb->remote_ip);
mbed714	0:d616ece2d859	340	local_port = pcb->local_port;
mbed714	0:d616ece2d859	341	remote_port = pcb->remote_port;
mbed714	0:d616ece2d859	342	#if LWIP_CALLBACK_API
mbed714	0:d616ece2d859	343	errf = pcb->errf;
mbed714	0:d616ece2d859	344	#endif /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	345	errf_arg = pcb->callback_arg;
mbed714	0:d616ece2d859	346	tcp_pcb_remove(&tcp_active_pcbs, pcb);
mbed714	0:d616ece2d859	347	if (pcb->unacked != NULL) {
mbed714	0:d616ece2d859	348	tcp_segs_free(pcb->unacked);
mbed714	0:d616ece2d859	349	}
mbed714	0:d616ece2d859	350	if (pcb->unsent != NULL) {
mbed714	0:d616ece2d859	351	tcp_segs_free(pcb->unsent);
mbed714	0:d616ece2d859	352	}
mbed714	0:d616ece2d859	353	#if TCP_QUEUE_OOSEQ
mbed714	0:d616ece2d859	354	if (pcb->ooseq != NULL) {
mbed714	0:d616ece2d859	355	tcp_segs_free(pcb->ooseq);
mbed714	0:d616ece2d859	356	}
mbed714	0:d616ece2d859	357	#endif /* TCP_QUEUE_OOSEQ */
mbed714	0:d616ece2d859	358	memp_free(MEMP_TCP_PCB, pcb);
mbed714	0:d616ece2d859	359	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
mbed714	0:d616ece2d859	360	if (reset) {
mbed714	0:d616ece2d859	361	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
mbed714	0:d616ece2d859	362	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
mbed714	0:d616ece2d859	363	}
mbed714	0:d616ece2d859	364	}
mbed714	0:d616ece2d859	365	}
mbed714	0:d616ece2d859	366
mbed714	0:d616ece2d859	367	/**
mbed714	0:d616ece2d859	368	* Aborts the connection by sending a RST (reset) segment to the remote
mbed714	0:d616ece2d859	369	* host. The pcb is deallocated. This function never fails.
mbed714	0:d616ece2d859	370	*
mbed714	0:d616ece2d859	371	* ATTENTION: When calling this from one of the TCP callbacks, make
mbed714	0:d616ece2d859	372	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
mbed714	0:d616ece2d859	373	* or you will risk accessing deallocated memory or memory leaks!
mbed714	0:d616ece2d859	374	*
mbed714	0:d616ece2d859	375	* @param pcb the tcp pcb to abort
mbed714	0:d616ece2d859	376	*/
mbed714	0:d616ece2d859	377	void
mbed714	0:d616ece2d859	378	tcp_abort(struct tcp_pcb *pcb)
mbed714	0:d616ece2d859	379	{
mbed714	0:d616ece2d859	380	tcp_abandon(pcb, 1);
mbed714	0:d616ece2d859	381	}
mbed714	0:d616ece2d859	382
mbed714	0:d616ece2d859	383	/**
mbed714	0:d616ece2d859	384	* Binds the connection to a local portnumber and IP address. If the
mbed714	0:d616ece2d859	385	* IP address is not given (i.e., ipaddr == NULL), the IP address of
mbed714	0:d616ece2d859	386	* the outgoing network interface is used instead.
mbed714	0:d616ece2d859	387	*
mbed714	0:d616ece2d859	388	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
mbed714	0:d616ece2d859	389	* already bound!)
mbed714	0:d616ece2d859	390	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
mbed714	0:d616ece2d859	391	* to any local address
mbed714	0:d616ece2d859	392	* @param port the local port to bind to
mbed714	0:d616ece2d859	393	* @return ERR_USE if the port is already in use
mbed714	0:d616ece2d859	394	* ERR_OK if bound
mbed714	0:d616ece2d859	395	*/
mbed714	0:d616ece2d859	396	err_t
mbed714	0:d616ece2d859	397	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
mbed714	0:d616ece2d859	398	{
mbed714	0:d616ece2d859	399	int i;
mbed714	0:d616ece2d859	400	int max_pcb_list = NUM_TCP_PCB_LISTS;
mbed714	0:d616ece2d859	401	struct tcp_pcb *cpcb;
mbed714	0:d616ece2d859	402
mbed714	0:d616ece2d859	403	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
mbed714	0:d616ece2d859	404
mbed714	0:d616ece2d859	405	#if SO_REUSE
mbed714	0:d616ece2d859	406	/* Unless the REUSEADDR flag is set,
mbed714	0:d616ece2d859	407	we have to check the pcbs in TIME-WAIT state, also.
mbed714	0:d616ece2d859	408	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
mbed714	0:d616ece2d859	409	packets using both local and remote IP addresses and ports to distinguish.
mbed714	0:d616ece2d859	410	*/
mbed714	0:d616ece2d859	411	#if SO_REUSE
mbed714	0:d616ece2d859	412	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mbed714	0:d616ece2d859	413	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
mbed714	0:d616ece2d859	414	}
mbed714	0:d616ece2d859	415	#endif /* SO_REUSE */
mbed714	0:d616ece2d859	416	#endif /* SO_REUSE */
mbed714	0:d616ece2d859	417
mbed714	0:d616ece2d859	418	if (port == 0) {
mbed714	0:d616ece2d859	419	port = tcp_new_port();
mbed714	0:d616ece2d859	420	}
mbed714	0:d616ece2d859	421
mbed714	0:d616ece2d859	422	/* Check if the address already is in use (on all lists) */
mbed714	0:d616ece2d859	423	for (i = 0; i < max_pcb_list; i++) {
mbed714	0:d616ece2d859	424	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
mbed714	0:d616ece2d859	425	if (cpcb->local_port == port) {
mbed714	0:d616ece2d859	426	#if SO_REUSE
mbed714	0:d616ece2d859	427	/* Omit checking for the same port if both pcbs have REUSEADDR set.
mbed714	0:d616ece2d859	428	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
mbed714	0:d616ece2d859	429	tcp_connect. */
mbed714	0:d616ece2d859	430	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
mbed714	0:d616ece2d859	431	((cpcb->so_options & SOF_REUSEADDR) == 0))
mbed714	0:d616ece2d859	432	#endif /* SO_REUSE */
mbed714	0:d616ece2d859	433	{
mbed714	0:d616ece2d859	434	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
mbed714	0:d616ece2d859	435	ip_addr_isany(ipaddr) \|\|
mbed714	0:d616ece2d859	436	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
mbed714	0:d616ece2d859	437	return ERR_USE;
mbed714	0:d616ece2d859	438	}
mbed714	0:d616ece2d859	439	}
mbed714	0:d616ece2d859	440	}
mbed714	0:d616ece2d859	441	}
mbed714	0:d616ece2d859	442	}
mbed714	0:d616ece2d859	443
mbed714	0:d616ece2d859	444	if (!ip_addr_isany(ipaddr)) {
mbed714	0:d616ece2d859	445	pcb->local_ip = *ipaddr;
mbed714	0:d616ece2d859	446	}
mbed714	0:d616ece2d859	447	pcb->local_port = port;
mbed714	0:d616ece2d859	448	TCP_REG(&tcp_bound_pcbs, pcb);
mbed714	0:d616ece2d859	449	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
mbed714	0:d616ece2d859	450	return ERR_OK;
mbed714	0:d616ece2d859	451	}
mbed714	0:d616ece2d859	452	#if LWIP_CALLBACK_API
mbed714	0:d616ece2d859	453	/**
mbed714	0:d616ece2d859	454	* Default accept callback if no accept callback is specified by the user.
mbed714	0:d616ece2d859	455	*/
mbed714	0:d616ece2d859	456	static err_t
mbed714	0:d616ece2d859	457	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
mbed714	0:d616ece2d859	458	{
mbed714	0:d616ece2d859	459	LWIP_UNUSED_ARG(arg);
mbed714	0:d616ece2d859	460	LWIP_UNUSED_ARG(pcb);
mbed714	0:d616ece2d859	461	LWIP_UNUSED_ARG(err);
mbed714	0:d616ece2d859	462
mbed714	0:d616ece2d859	463	return ERR_ABRT;
mbed714	0:d616ece2d859	464	}
mbed714	0:d616ece2d859	465	#endif /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	466
mbed714	0:d616ece2d859	467	/**
mbed714	0:d616ece2d859	468	* Set the state of the connection to be LISTEN, which means that it
mbed714	0:d616ece2d859	469	* is able to accept incoming connections. The protocol control block
mbed714	0:d616ece2d859	470	* is reallocated in order to consume less memory. Setting the
mbed714	0:d616ece2d859	471	* connection to LISTEN is an irreversible process.
mbed714	0:d616ece2d859	472	*
mbed714	0:d616ece2d859	473	* @param pcb the original tcp_pcb
mbed714	0:d616ece2d859	474	* @param backlog the incoming connections queue limit
mbed714	0:d616ece2d859	475	* @return tcp_pcb used for listening, consumes less memory.
mbed714	0:d616ece2d859	476	*
mbed714	0:d616ece2d859	477	* @note The original tcp_pcb is freed. This function therefore has to be
mbed714	0:d616ece2d859	478	* called like this:
mbed714	0:d616ece2d859	479	* tpcb = tcp_listen(tpcb);
mbed714	0:d616ece2d859	480	*/
mbed714	0:d616ece2d859	481	struct tcp_pcb *
mbed714	0:d616ece2d859	482	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
mbed714	0:d616ece2d859	483	{
mbed714	0:d616ece2d859	484	struct tcp_pcb_listen *lpcb;
mbed714	0:d616ece2d859	485
mbed714	0:d616ece2d859	486	LWIP_UNUSED_ARG(backlog);
mbed714	0:d616ece2d859	487	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
mbed714	0:d616ece2d859	488
mbed714	0:d616ece2d859	489	/* already listening? */
mbed714	0:d616ece2d859	490	if (pcb->state == LISTEN) {
mbed714	0:d616ece2d859	491	return pcb;
mbed714	0:d616ece2d859	492	}
mbed714	0:d616ece2d859	493	#if SO_REUSE
mbed714	0:d616ece2d859	494	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mbed714	0:d616ece2d859	495	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
mbed714	0:d616ece2d859	496	is declared (listen-/connection-pcb), we have to make sure now that
mbed714	0:d616ece2d859	497	this port is only used once for every local IP. */
mbed714	0:d616ece2d859	498	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
mbed714	0:d616ece2d859	499	if (lpcb->local_port == pcb->local_port) {
mbed714	0:d616ece2d859	500	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
mbed714	0:d616ece2d859	501	/* this address/port is already used */
mbed714	0:d616ece2d859	502	return NULL;
mbed714	0:d616ece2d859	503	}
mbed714	0:d616ece2d859	504	}
mbed714	0:d616ece2d859	505	}
mbed714	0:d616ece2d859	506	}
mbed714	0:d616ece2d859	507	#endif /* SO_REUSE */
mbed714	0:d616ece2d859	508	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
mbed714	0:d616ece2d859	509	if (lpcb == NULL) {
mbed714	0:d616ece2d859	510	return NULL;
mbed714	0:d616ece2d859	511	}
mbed714	0:d616ece2d859	512	lpcb->callback_arg = pcb->callback_arg;
mbed714	0:d616ece2d859	513	lpcb->local_port = pcb->local_port;
mbed714	0:d616ece2d859	514	lpcb->state = LISTEN;
mbed714	0:d616ece2d859	515	lpcb->prio = pcb->prio;
mbed714	0:d616ece2d859	516	lpcb->so_options = pcb->so_options;
mbed714	0:d616ece2d859	517	lpcb->so_options \|= SOF_ACCEPTCONN;
mbed714	0:d616ece2d859	518	lpcb->ttl = pcb->ttl;
mbed714	0:d616ece2d859	519	lpcb->tos = pcb->tos;
mbed714	0:d616ece2d859	520	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
mbed714	0:d616ece2d859	521	TCP_RMV(&tcp_bound_pcbs, pcb);
mbed714	0:d616ece2d859	522	memp_free(MEMP_TCP_PCB, pcb);
mbed714	0:d616ece2d859	523	#if LWIP_CALLBACK_API
mbed714	0:d616ece2d859	524	lpcb->accept = tcp_accept_null;
mbed714	0:d616ece2d859	525	#endif /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	526	#if TCP_LISTEN_BACKLOG
mbed714	0:d616ece2d859	527	lpcb->accepts_pending = 0;
mbed714	0:d616ece2d859	528	lpcb->backlog = (backlog ? backlog : 1);
mbed714	0:d616ece2d859	529	#endif /* TCP_LISTEN_BACKLOG */
mbed714	0:d616ece2d859	530	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
mbed714	0:d616ece2d859	531	return (struct tcp_pcb *)lpcb;
mbed714	0:d616ece2d859	532	}
mbed714	0:d616ece2d859	533
mbed714	0:d616ece2d859	534	/**
mbed714	0:d616ece2d859	535	* Update the state that tracks the available window space to advertise.
mbed714	0:d616ece2d859	536	*
mbed714	0:d616ece2d859	537	* Returns how much extra window would be advertised if we sent an
mbed714	0:d616ece2d859	538	* update now.
mbed714	0:d616ece2d859	539	*/
mbed714	0:d616ece2d859	540	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
mbed714	0:d616ece2d859	541	{
mbed714	0:d616ece2d859	542	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
mbed714	0:d616ece2d859	543
mbed714	0:d616ece2d859	544	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
mbed714	0:d616ece2d859	545	/* we can advertise more window */
mbed714	0:d616ece2d859	546	pcb->rcv_ann_wnd = pcb->rcv_wnd;
mbed714	0:d616ece2d859	547	return new_right_edge - pcb->rcv_ann_right_edge;
mbed714	0:d616ece2d859	548	} else {
mbed714	0:d616ece2d859	549	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
mbed714	0:d616ece2d859	550	/* Can happen due to other end sending out of advertised window,
mbed714	0:d616ece2d859	551	* but within actual available (but not yet advertised) window */
mbed714	0:d616ece2d859	552	pcb->rcv_ann_wnd = 0;
mbed714	0:d616ece2d859	553	} else {
mbed714	0:d616ece2d859	554	/* keep the right edge of window constant */
mbed714	0:d616ece2d859	555	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
mbed714	0:d616ece2d859	556	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
mbed714	0:d616ece2d859	557	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
mbed714	0:d616ece2d859	558	}
mbed714	0:d616ece2d859	559	return 0;
mbed714	0:d616ece2d859	560	}
mbed714	0:d616ece2d859	561	}
mbed714	0:d616ece2d859	562
mbed714	0:d616ece2d859	563	/**
mbed714	0:d616ece2d859	564	* This function should be called by the application when it has
mbed714	0:d616ece2d859	565	* processed the data. The purpose is to advertise a larger window
mbed714	0:d616ece2d859	566	* when the data has been processed.
mbed714	0:d616ece2d859	567	*
mbed714	0:d616ece2d859	568	* @param pcb the tcp_pcb for which data is read
mbed714	0:d616ece2d859	569	* @param len the amount of bytes that have been read by the application
mbed714	0:d616ece2d859	570	*/
mbed714	0:d616ece2d859	571	void
mbed714	0:d616ece2d859	572	tcp_recved(struct tcp_pcb *pcb, u16_t len)
mbed714	0:d616ece2d859	573	{
mbed714	0:d616ece2d859	574	int wnd_inflation;
mbed714	0:d616ece2d859	575
mbed714	0:d616ece2d859	576	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
mbed714	0:d616ece2d859	577	len <= 0xffff - pcb->rcv_wnd );
mbed714	0:d616ece2d859	578
mbed714	0:d616ece2d859	579	pcb->rcv_wnd += len;
mbed714	0:d616ece2d859	580	if (pcb->rcv_wnd > TCP_WND) {
mbed714	0:d616ece2d859	581	pcb->rcv_wnd = TCP_WND;
mbed714	0:d616ece2d859	582	}
mbed714	0:d616ece2d859	583
mbed714	0:d616ece2d859	584	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
mbed714	0:d616ece2d859	585
mbed714	0:d616ece2d859	586	/* If the change in the right edge of window is significant (default
mbed714	0:d616ece2d859	587	* watermark is TCP_WND/4), then send an explicit update now.
mbed714	0:d616ece2d859	588	* Otherwise wait for a packet to be sent in the normal course of
mbed714	0:d616ece2d859	589	* events (or more window to be available later) */
mbed714	0:d616ece2d859	590	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
mbed714	0:d616ece2d859	591	tcp_ack_now(pcb);
mbed714	0:d616ece2d859	592	tcp_output(pcb);
mbed714	0:d616ece2d859	593	}
mbed714	0:d616ece2d859	594
mbed714	0:d616ece2d859	595	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
mbed714	0:d616ece2d859	596	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
mbed714	0:d616ece2d859	597	}
mbed714	0:d616ece2d859	598
mbed714	0:d616ece2d859	599	/**
mbed714	0:d616ece2d859	600	* A nastly hack featuring 'goto' statements that allocates a
mbed714	0:d616ece2d859	601	* new TCP local port.
mbed714	0:d616ece2d859	602	*
mbed714	0:d616ece2d859	603	* @return a new (free) local TCP port number
mbed714	0:d616ece2d859	604	*/
mbed714	0:d616ece2d859	605	static u16_t
mbed714	0:d616ece2d859	606	tcp_new_port(void)
mbed714	0:d616ece2d859	607	{
mbed714	0:d616ece2d859	608	int i;
mbed714	0:d616ece2d859	609	struct tcp_pcb *pcb;
mbed714	0:d616ece2d859	610	#ifndef TCP_LOCAL_PORT_RANGE_START
mbed714	0:d616ece2d859	611	#define TCP_LOCAL_PORT_RANGE_START 4096
mbed714	0:d616ece2d859	612	#define TCP_LOCAL_PORT_RANGE_END 0x7fff
mbed714	0:d616ece2d859	613	#endif
mbed714	0:d616ece2d859	614	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
mbed714	0:d616ece2d859	615
mbed714	0:d616ece2d859	616	again:
mbed714	0:d616ece2d859	617	if (++port > TCP_LOCAL_PORT_RANGE_END) {
mbed714	0:d616ece2d859	618	port = TCP_LOCAL_PORT_RANGE_START;
mbed714	0:d616ece2d859	619	}
mbed714	0:d616ece2d859	620	/* Check all PCB lists. */
mbed714	0:d616ece2d859	621	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
mbed714	0:d616ece2d859	622	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
mbed714	0:d616ece2d859	623	if (pcb->local_port == port) {
mbed714	0:d616ece2d859	624	goto again;
mbed714	0:d616ece2d859	625	}
mbed714	0:d616ece2d859	626	}
mbed714	0:d616ece2d859	627	}
mbed714	0:d616ece2d859	628	return port;
mbed714	0:d616ece2d859	629	}
mbed714	0:d616ece2d859	630
mbed714	0:d616ece2d859	631	/**
mbed714	0:d616ece2d859	632	* Connects to another host. The function given as the "connected"
mbed714	0:d616ece2d859	633	* argument will be called when the connection has been established.
mbed714	0:d616ece2d859	634	*
mbed714	0:d616ece2d859	635	* @param pcb the tcp_pcb used to establish the connection
mbed714	0:d616ece2d859	636	* @param ipaddr the remote ip address to connect to
mbed714	0:d616ece2d859	637	* @param port the remote tcp port to connect to
mbed714	0:d616ece2d859	638	* @param connected callback function to call when connected (or on error)
mbed714	0:d616ece2d859	639	* @return ERR_VAL if invalid arguments are given
mbed714	0:d616ece2d859	640	* ERR_OK if connect request has been sent
mbed714	0:d616ece2d859	641	* other err_t values if connect request couldn't be sent
mbed714	0:d616ece2d859	642	*/
mbed714	0:d616ece2d859	643	err_t
mbed714	0:d616ece2d859	644	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
mbed714	0:d616ece2d859	645	tcp_connected_fn connected)
mbed714	0:d616ece2d859	646	{
mbed714	0:d616ece2d859	647	err_t ret;
mbed714	0:d616ece2d859	648	u32_t iss;
mbed714	0:d616ece2d859	649
mbed714	0:d616ece2d859	650	LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
mbed714	0:d616ece2d859	651
mbed714	0:d616ece2d859	652	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
mbed714	0:d616ece2d859	653	if (ipaddr != NULL) {
mbed714	0:d616ece2d859	654	pcb->remote_ip = *ipaddr;
mbed714	0:d616ece2d859	655	} else {
mbed714	0:d616ece2d859	656	return ERR_VAL;
mbed714	0:d616ece2d859	657	}
mbed714	0:d616ece2d859	658	pcb->remote_port = port;
mbed714	0:d616ece2d859	659
mbed714	0:d616ece2d859	660	/* check if we have a route to the remote host */
mbed714	0:d616ece2d859	661	if (ip_addr_isany(&(pcb->local_ip))) {
mbed714	0:d616ece2d859	662	/* no local IP address set, yet. */
mbed714	0:d616ece2d859	663	struct netif *netif = ip_route(&(pcb->remote_ip));
mbed714	0:d616ece2d859	664	if (netif == NULL) {
mbed714	0:d616ece2d859	665	/* Don't even try to send a SYN packet if we have no route
mbed714	0:d616ece2d859	666	since that will fail. */
mbed714	0:d616ece2d859	667	return ERR_RTE;
mbed714	0:d616ece2d859	668	}
mbed714	0:d616ece2d859	669	/* Use the netif's IP address as local address. */
mbed714	0:d616ece2d859	670	ip_addr_copy(pcb->local_ip, netif->ip_addr);
mbed714	0:d616ece2d859	671	}
mbed714	0:d616ece2d859	672
mbed714	0:d616ece2d859	673	if (pcb->local_port == 0) {
mbed714	0:d616ece2d859	674	pcb->local_port = tcp_new_port();
mbed714	0:d616ece2d859	675	}
mbed714	0:d616ece2d859	676	#if SO_REUSE
mbed714	0:d616ece2d859	677	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mbed714	0:d616ece2d859	678	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
mbed714	0:d616ece2d859	679	now that the 5-tuple is unique. */
mbed714	0:d616ece2d859	680	struct tcp_pcb *cpcb;
mbed714	0:d616ece2d859	681	int i;
mbed714	0:d616ece2d859	682	/* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
mbed714	0:d616ece2d859	683	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
mbed714	0:d616ece2d859	684	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
mbed714	0:d616ece2d859	685	if ((cpcb->local_port == pcb->local_port) &&
mbed714	0:d616ece2d859	686	(cpcb->remote_port == port) &&
mbed714	0:d616ece2d859	687	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
mbed714	0:d616ece2d859	688	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
mbed714	0:d616ece2d859	689	/* linux returns EISCONN here, but ERR_USE should be OK for us */
mbed714	0:d616ece2d859	690	return ERR_USE;
mbed714	0:d616ece2d859	691	}
mbed714	0:d616ece2d859	692	}
mbed714	0:d616ece2d859	693	}
mbed714	0:d616ece2d859	694	}
mbed714	0:d616ece2d859	695	#endif /* SO_REUSE */
mbed714	0:d616ece2d859	696	iss = tcp_next_iss();
mbed714	0:d616ece2d859	697	pcb->rcv_nxt = 0;
mbed714	0:d616ece2d859	698	pcb->snd_nxt = iss;
mbed714	0:d616ece2d859	699	pcb->lastack = iss - 1;
mbed714	0:d616ece2d859	700	pcb->snd_lbb = iss - 1;
mbed714	0:d616ece2d859	701	pcb->rcv_wnd = TCP_WND;
mbed714	0:d616ece2d859	702	pcb->rcv_ann_wnd = TCP_WND;
mbed714	0:d616ece2d859	703	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
mbed714	0:d616ece2d859	704	pcb->snd_wnd = TCP_WND;
mbed714	0:d616ece2d859	705	/* As initial send MSS, we use TCP_MSS but limit it to 536.
mbed714	0:d616ece2d859	706	The send MSS is updated when an MSS option is received. */
mbed714	0:d616ece2d859	707	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
mbed714	0:d616ece2d859	708	#if TCP_CALCULATE_EFF_SEND_MSS
mbed714	0:d616ece2d859	709	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
mbed714	0:d616ece2d859	710	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
mbed714	0:d616ece2d859	711	pcb->cwnd = 1;
mbed714	0:d616ece2d859	712	pcb->ssthresh = pcb->mss * 10;
mbed714	0:d616ece2d859	713	#if LWIP_CALLBACK_API
mbed714	0:d616ece2d859	714	pcb->connected = connected;
mbed714	0:d616ece2d859	715	#else /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	716	LWIP_UNUSED_ARG(connected);
mbed714	0:d616ece2d859	717	#endif /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	718
mbed714	0:d616ece2d859	719	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
mbed714	0:d616ece2d859	720
mbed714	0:d616ece2d859	721	/* Send a SYN together with the MSS option. */
mbed714	0:d616ece2d859	722	ret = tcp_enqueue_flags(pcb, TCP_SYN);
mbed714	0:d616ece2d859	723	if (ret == ERR_OK) {
mbed714	0:d616ece2d859	724	/* SYN segment was enqueued, changed the pcbs state now */
mbed714	0:d616ece2d859	725	pcb->state = SYN_SENT;
mbed714	0:d616ece2d859	726	TCP_RMV(&tcp_bound_pcbs, pcb);
mbed714	0:d616ece2d859	727	TCP_REG(&tcp_active_pcbs, pcb);
mbed714	0:d616ece2d859	728	snmp_inc_tcpactiveopens();
mbed714	0:d616ece2d859	729
mbed714	0:d616ece2d859	730	tcp_output(pcb);
mbed714	0:d616ece2d859	731	}
mbed714	0:d616ece2d859	732	return ret;
mbed714	0:d616ece2d859	733	}
mbed714	0:d616ece2d859	734
mbed714	0:d616ece2d859	735	/**
mbed714	0:d616ece2d859	736	* Called every 500 ms and implements the retransmission timer and the timer that
mbed714	0:d616ece2d859	737	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
mbed714	0:d616ece2d859	738	* various timers such as the inactivity timer in each PCB.
mbed714	0:d616ece2d859	739	*
mbed714	0:d616ece2d859	740	* Automatically called from tcp_tmr().
mbed714	0:d616ece2d859	741	*/
mbed714	0:d616ece2d859	742	void
mbed714	0:d616ece2d859	743	tcp_slowtmr(void)
mbed714	0:d616ece2d859	744	{
mbed714	0:d616ece2d859	745	struct tcp_pcb pcb, pcb2, *prev;
mbed714	0:d616ece2d859	746	u16_t eff_wnd;
mbed714	0:d616ece2d859	747	u8_t pcb_remove; /* flag if a PCB should be removed */
mbed714	0:d616ece2d859	748	u8_t pcb_reset; /* flag if a RST should be sent when removing */
mbed714	0:d616ece2d859	749	err_t err;
mbed714	0:d616ece2d859	750
mbed714	0:d616ece2d859	751	tcp_debug_print_pcbs(); //DG
mbed714	0:d616ece2d859	752
mbed714	0:d616ece2d859	753	err = ERR_OK;
mbed714	0:d616ece2d859	754
mbed714	0:d616ece2d859	755	++tcp_ticks;
mbed714	0:d616ece2d859	756	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
mbed714	0:d616ece2d859	757
mbed714	0:d616ece2d859	758	/* Steps through all of the active PCBs. */
mbed714	0:d616ece2d859	759	prev = NULL;
mbed714	0:d616ece2d859	760	pcb = tcp_active_pcbs;
mbed714	0:d616ece2d859	761	if (pcb == NULL) {
mbed714	0:d616ece2d859	762	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
mbed714	0:d616ece2d859	763	}
mbed714	0:d616ece2d859	764	while (pcb != NULL) {
mbed714	0:d616ece2d859	765	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
mbed714	0:d616ece2d859	766	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
mbed714	0:d616ece2d859	767	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
mbed714	0:d616ece2d859	768	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
mbed714	0:d616ece2d859	769
mbed714	0:d616ece2d859	770	pcb_remove = 0;
mbed714	0:d616ece2d859	771	pcb_reset = 0;
mbed714	0:d616ece2d859	772
mbed714	0:d616ece2d859	773	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
mbed714	0:d616ece2d859	774	++pcb_remove;
mbed714	0:d616ece2d859	775	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
mbed714	0:d616ece2d859	776	}
mbed714	0:d616ece2d859	777	else if (pcb->nrtx == TCP_MAXRTX) {
mbed714	0:d616ece2d859	778	++pcb_remove;
mbed714	0:d616ece2d859	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
mbed714	0:d616ece2d859	780	} else {
mbed714	0:d616ece2d859	781	if (pcb->persist_backoff > 0) {
mbed714	0:d616ece2d859	782	/* If snd_wnd is zero, use persist timer to send 1 byte probes
mbed714	0:d616ece2d859	783	* instead of using the standard retransmission mechanism. */
mbed714	0:d616ece2d859	784	pcb->persist_cnt++;
mbed714	0:d616ece2d859	785	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
mbed714	0:d616ece2d859	786	pcb->persist_cnt = 0;
mbed714	0:d616ece2d859	787	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
mbed714	0:d616ece2d859	788	pcb->persist_backoff++;
mbed714	0:d616ece2d859	789	}
mbed714	0:d616ece2d859	790	tcp_zero_window_probe(pcb);
mbed714	0:d616ece2d859	791	}
mbed714	0:d616ece2d859	792	} else {
mbed714	0:d616ece2d859	793	/* Increase the retransmission timer if it is running */
mbed714	0:d616ece2d859	794	if(pcb->rtime >= 0)
mbed714	0:d616ece2d859	795	++pcb->rtime;
mbed714	0:d616ece2d859	796
mbed714	0:d616ece2d859	797	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
mbed714	0:d616ece2d859	798	/* Time for a retransmission. */
mbed714	0:d616ece2d859	799	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
mbed714	0:d616ece2d859	800	" pcb->rto %"S16_F"\n",
mbed714	0:d616ece2d859	801	pcb->rtime, pcb->rto));
mbed714	0:d616ece2d859	802
mbed714	0:d616ece2d859	803	/* Double retransmission time-out unless we are trying to
mbed714	0:d616ece2d859	804	* connect to somebody (i.e., we are in SYN_SENT). */
mbed714	0:d616ece2d859	805	if (pcb->state != SYN_SENT) {
mbed714	0:d616ece2d859	806	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
mbed714	0:d616ece2d859	807	}
mbed714	0:d616ece2d859	808
mbed714	0:d616ece2d859	809	/* Reset the retransmission timer. */
mbed714	0:d616ece2d859	810	pcb->rtime = 0;
mbed714	0:d616ece2d859	811
mbed714	0:d616ece2d859	812	/* Reduce congestion window and ssthresh. */
mbed714	0:d616ece2d859	813	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
mbed714	0:d616ece2d859	814	pcb->ssthresh = eff_wnd >> 1;
mbed714	0:d616ece2d859	815	if (pcb->ssthresh < (pcb->mss << 1)) {
mbed714	0:d616ece2d859	816	pcb->ssthresh = (pcb->mss << 1);
mbed714	0:d616ece2d859	817	}
mbed714	0:d616ece2d859	818	pcb->cwnd = pcb->mss;
mbed714	0:d616ece2d859	819	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
mbed714	0:d616ece2d859	820	" ssthresh %"U16_F"\n",
mbed714	0:d616ece2d859	821	pcb->cwnd, pcb->ssthresh));
mbed714	0:d616ece2d859	822
mbed714	0:d616ece2d859	823	/* The following needs to be called AFTER cwnd is set to one
mbed714	0:d616ece2d859	824	mss - STJ */
mbed714	0:d616ece2d859	825	tcp_rexmit_rto(pcb);
mbed714	0:d616ece2d859	826	}
mbed714	0:d616ece2d859	827	}
mbed714	0:d616ece2d859	828	}
mbed714	0:d616ece2d859	829	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
mbed714	0:d616ece2d859	830	if (pcb->state == FIN_WAIT_2) {
mbed714	0:d616ece2d859	831	if ((u32_t)(tcp_ticks - pcb->tmr) >
mbed714	0:d616ece2d859	832	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
mbed714	0:d616ece2d859	833	++pcb_remove;
mbed714	0:d616ece2d859	834	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
mbed714	0:d616ece2d859	835	}
mbed714	0:d616ece2d859	836	}
mbed714	0:d616ece2d859	837
mbed714	0:d616ece2d859	838	/* Check if KEEPALIVE should be sent */
mbed714	0:d616ece2d859	839	if((pcb->so_options & SOF_KEEPALIVE) &&
mbed714	0:d616ece2d859	840	((pcb->state == ESTABLISHED) \|\|
mbed714	0:d616ece2d859	841	(pcb->state == CLOSE_WAIT))) {
mbed714	0:d616ece2d859	842	#if LWIP_TCP_KEEPALIVE
mbed714	0:d616ece2d859	843	if((u32_t)(tcp_ticks - pcb->tmr) >
mbed714	0:d616ece2d859	844	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
mbed714	0:d616ece2d859	845	/ TCP_SLOW_INTERVAL)
mbed714	0:d616ece2d859	846	#else
mbed714	0:d616ece2d859	847	if((u32_t)(tcp_ticks - pcb->tmr) >
mbed714	0:d616ece2d859	848	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
mbed714	0:d616ece2d859	849	#endif /* LWIP_TCP_KEEPALIVE */
mbed714	0:d616ece2d859	850	{
mbed714	0:d616ece2d859	851	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
mbed714	0:d616ece2d859	852	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
mbed714	0:d616ece2d859	853	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
mbed714	0:d616ece2d859	854
mbed714	0:d616ece2d859	855	++pcb_remove;
mbed714	0:d616ece2d859	856	++pcb_reset;
mbed714	0:d616ece2d859	857	}
mbed714	0:d616ece2d859	858	#if LWIP_TCP_KEEPALIVE
mbed714	0:d616ece2d859	859	else if((u32_t)(tcp_ticks - pcb->tmr) >
mbed714	0:d616ece2d859	860	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
mbed714	0:d616ece2d859	861	/ TCP_SLOW_INTERVAL)
mbed714	0:d616ece2d859	862	#else
mbed714	0:d616ece2d859	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
mbed714	0:d616ece2d859	864	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
mbed714	0:d616ece2d859	865	/ TCP_SLOW_INTERVAL)
mbed714	0:d616ece2d859	866	#endif /* LWIP_TCP_KEEPALIVE */
mbed714	0:d616ece2d859	867	{
mbed714	0:d616ece2d859	868	tcp_keepalive(pcb);
mbed714	0:d616ece2d859	869	pcb->keep_cnt_sent++;
mbed714	0:d616ece2d859	870	}
mbed714	0:d616ece2d859	871	}
mbed714	0:d616ece2d859	872
mbed714	0:d616ece2d859	873	/* If this PCB has queued out of sequence data, but has been
mbed714	0:d616ece2d859	874	inactive for too long, will drop the data (it will eventually
mbed714	0:d616ece2d859	875	be retransmitted). */
mbed714	0:d616ece2d859	876	#if TCP_QUEUE_OOSEQ
mbed714	0:d616ece2d859	877	if (pcb->ooseq != NULL &&
mbed714	0:d616ece2d859	878	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
mbed714	0:d616ece2d859	879	tcp_segs_free(pcb->ooseq);
mbed714	0:d616ece2d859	880	pcb->ooseq = NULL;
mbed714	0:d616ece2d859	881	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
mbed714	0:d616ece2d859	882	}
mbed714	0:d616ece2d859	883	#endif /* TCP_QUEUE_OOSEQ */
mbed714	0:d616ece2d859	884
mbed714	0:d616ece2d859	885	/* Check if this PCB has stayed too long in SYN-RCVD */
mbed714	0:d616ece2d859	886	if (pcb->state == SYN_RCVD) {
mbed714	0:d616ece2d859	887	if ((u32_t)(tcp_ticks - pcb->tmr) >
mbed714	0:d616ece2d859	888	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
mbed714	0:d616ece2d859	889	++pcb_remove;
mbed714	0:d616ece2d859	890	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
mbed714	0:d616ece2d859	891	}
mbed714	0:d616ece2d859	892	}
mbed714	0:d616ece2d859	893
mbed714	0:d616ece2d859	894	/* Check if this PCB has stayed too long in LAST-ACK */
mbed714	0:d616ece2d859	895	if (pcb->state == LAST_ACK) {
mbed714	0:d616ece2d859	896	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
mbed714	0:d616ece2d859	897	++pcb_remove;
mbed714	0:d616ece2d859	898	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
mbed714	0:d616ece2d859	899	}
mbed714	0:d616ece2d859	900	}
mbed714	0:d616ece2d859	901
mbed714	0:d616ece2d859	902	/* If the PCB should be removed, do it. */
mbed714	0:d616ece2d859	903	if (pcb_remove) {
mbed714	0:d616ece2d859	904	tcp_pcb_purge(pcb);
mbed714	0:d616ece2d859	905	/* Remove PCB from tcp_active_pcbs list. */
mbed714	0:d616ece2d859	906	if (prev != NULL) {
mbed714	0:d616ece2d859	907	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
mbed714	0:d616ece2d859	908	prev->next = pcb->next;
mbed714	0:d616ece2d859	909	} else {
mbed714	0:d616ece2d859	910	/* This PCB was the first. */
mbed714	0:d616ece2d859	911	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
mbed714	0:d616ece2d859	912	tcp_active_pcbs = pcb->next;
mbed714	0:d616ece2d859	913	}
mbed714	0:d616ece2d859	914
mbed714	0:d616ece2d859	915	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
mbed714	0:d616ece2d859	916	if (pcb_reset) {
mbed714	0:d616ece2d859	917	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
mbed714	0:d616ece2d859	918	pcb->local_port, pcb->remote_port);
mbed714	0:d616ece2d859	919	}
mbed714	0:d616ece2d859	920
mbed714	0:d616ece2d859	921	pcb2 = pcb->next;
mbed714	0:d616ece2d859	922	memp_free(MEMP_TCP_PCB, pcb);
mbed714	0:d616ece2d859	923	pcb = pcb2;
mbed714	0:d616ece2d859	924	} else {
mbed714	0:d616ece2d859	925	/* get the 'next' element now and work with 'prev' below (in case of abort) */
mbed714	0:d616ece2d859	926	prev = pcb;
mbed714	0:d616ece2d859	927	pcb = pcb->next;
mbed714	0:d616ece2d859	928
mbed714	0:d616ece2d859	929	/* We check if we should poll the connection. */
mbed714	0:d616ece2d859	930	++prev->polltmr;
mbed714	0:d616ece2d859	931	if (prev->polltmr >= prev->pollinterval) {
mbed714	0:d616ece2d859	932	prev->polltmr = 0;
mbed714	0:d616ece2d859	933	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
mbed714	0:d616ece2d859	934	TCP_EVENT_POLL(prev, err);
mbed714	0:d616ece2d859	935	/* if err == ERR_ABRT, 'prev' is already deallocated */
mbed714	0:d616ece2d859	936	if (err == ERR_OK) {
mbed714	0:d616ece2d859	937	tcp_output(prev);
mbed714	0:d616ece2d859	938	}
mbed714	0:d616ece2d859	939	}
mbed714	0:d616ece2d859	940	}
mbed714	0:d616ece2d859	941	}
mbed714	0:d616ece2d859	942
mbed714	0:d616ece2d859	943
mbed714	0:d616ece2d859	944	/* Steps through all of the TIME-WAIT PCBs. */
mbed714	0:d616ece2d859	945	prev = NULL;
mbed714	0:d616ece2d859	946	pcb = tcp_tw_pcbs;
mbed714	0:d616ece2d859	947	while (pcb != NULL) {
mbed714	0:d616ece2d859	948	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
mbed714	0:d616ece2d859	949	pcb_remove = 0;
mbed714	0:d616ece2d859	950
mbed714	0:d616ece2d859	951	/* Check if this PCB has stayed long enough in TIME-WAIT */
mbed714	0:d616ece2d859	952	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
mbed714	0:d616ece2d859	953	++pcb_remove;
mbed714	0:d616ece2d859	954	}
mbed714	0:d616ece2d859	955
mbed714	0:d616ece2d859	956
mbed714	0:d616ece2d859	957
mbed714	0:d616ece2d859	958	/* If the PCB should be removed, do it. */
mbed714	0:d616ece2d859	959	if (pcb_remove) {
mbed714	0:d616ece2d859	960	tcp_pcb_purge(pcb);
mbed714	0:d616ece2d859	961	/* Remove PCB from tcp_tw_pcbs list. */
mbed714	0:d616ece2d859	962	if (prev != NULL) {
mbed714	0:d616ece2d859	963	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
mbed714	0:d616ece2d859	964	prev->next = pcb->next;
mbed714	0:d616ece2d859	965	} else {
mbed714	0:d616ece2d859	966	/* This PCB was the first. */
mbed714	0:d616ece2d859	967	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
mbed714	0:d616ece2d859	968	tcp_tw_pcbs = pcb->next;
mbed714	0:d616ece2d859	969	}
mbed714	0:d616ece2d859	970	pcb2 = pcb->next;
mbed714	0:d616ece2d859	971	memp_free(MEMP_TCP_PCB, pcb);
mbed714	0:d616ece2d859	972	pcb = pcb2;
mbed714	0:d616ece2d859	973	} else {
mbed714	0:d616ece2d859	974	prev = pcb;
mbed714	0:d616ece2d859	975	pcb = pcb->next;
mbed714	0:d616ece2d859	976	}
mbed714	0:d616ece2d859	977	}
mbed714	0:d616ece2d859	978	}
mbed714	0:d616ece2d859	979
mbed714	0:d616ece2d859	980	/**
mbed714	0:d616ece2d859	981	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
mbed714	0:d616ece2d859	982	* "refused" by upper layer (application) and sends delayed ACKs.
mbed714	0:d616ece2d859	983	*
mbed714	0:d616ece2d859	984	* Automatically called from tcp_tmr().
mbed714	0:d616ece2d859	985	*/
mbed714	0:d616ece2d859	986	void
mbed714	0:d616ece2d859	987	tcp_fasttmr(void)
mbed714	0:d616ece2d859	988	{
mbed714	0:d616ece2d859	989	struct tcp_pcb *pcb = tcp_active_pcbs;
mbed714	0:d616ece2d859	990
mbed714	0:d616ece2d859	991	while(pcb != NULL) {
mbed714	0:d616ece2d859	992	struct tcp_pcb *next = pcb->next;
mbed714	0:d616ece2d859	993	/* If there is data which was previously "refused" by upper layer */
mbed714	0:d616ece2d859	994	if (pcb->refused_data != NULL) {
mbed714	0:d616ece2d859	995	/* Notify again application with data previously received. */
mbed714	0:d616ece2d859	996	err_t err;
mbed714	0:d616ece2d859	997	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
mbed714	0:d616ece2d859	998	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
mbed714	0:d616ece2d859	999	if (err == ERR_OK) {
mbed714	0:d616ece2d859	1000	pcb->refused_data = NULL;
mbed714	0:d616ece2d859	1001	} else if (err == ERR_ABRT) {
mbed714	0:d616ece2d859	1002	/* if err == ERR_ABRT, 'pcb' is already deallocated */
mbed714	0:d616ece2d859	1003	pcb = NULL;
mbed714	0:d616ece2d859	1004	}
mbed714	0:d616ece2d859	1005	}
mbed714	0:d616ece2d859	1006
mbed714	0:d616ece2d859	1007	/* send delayed ACKs */
mbed714	0:d616ece2d859	1008	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
mbed714	0:d616ece2d859	1009	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
mbed714	0:d616ece2d859	1010	tcp_ack_now(pcb);
mbed714	0:d616ece2d859	1011	tcp_output(pcb);
mbed714	0:d616ece2d859	1012	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
mbed714	0:d616ece2d859	1013	}
mbed714	0:d616ece2d859	1014
mbed714	0:d616ece2d859	1015	pcb = next;
mbed714	0:d616ece2d859	1016	}
mbed714	0:d616ece2d859	1017	}
mbed714	0:d616ece2d859	1018
mbed714	0:d616ece2d859	1019	/**
mbed714	0:d616ece2d859	1020	* Deallocates a list of TCP segments (tcp_seg structures).
mbed714	0:d616ece2d859	1021	*
mbed714	0:d616ece2d859	1022	* @param seg tcp_seg list of TCP segments to free
mbed714	0:d616ece2d859	1023	*/
mbed714	0:d616ece2d859	1024	void
mbed714	0:d616ece2d859	1025	tcp_segs_free(struct tcp_seg *seg)
mbed714	0:d616ece2d859	1026	{
mbed714	0:d616ece2d859	1027	while (seg != NULL) {
mbed714	0:d616ece2d859	1028	struct tcp_seg *next = seg->next;
mbed714	0:d616ece2d859	1029	tcp_seg_free(seg);
mbed714	0:d616ece2d859	1030	seg = next;
mbed714	0:d616ece2d859	1031	}
mbed714	0:d616ece2d859	1032	}
mbed714	0:d616ece2d859	1033
mbed714	0:d616ece2d859	1034	/**
mbed714	0:d616ece2d859	1035	* Frees a TCP segment (tcp_seg structure).
mbed714	0:d616ece2d859	1036	*
mbed714	0:d616ece2d859	1037	* @param seg single tcp_seg to free
mbed714	0:d616ece2d859	1038	*/
mbed714	0:d616ece2d859	1039	void
mbed714	0:d616ece2d859	1040	tcp_seg_free(struct tcp_seg *seg)
mbed714	0:d616ece2d859	1041	{
mbed714	0:d616ece2d859	1042	if (seg != NULL) {
mbed714	0:d616ece2d859	1043	if (seg->p != NULL) {
mbed714	0:d616ece2d859	1044	pbuf_free(seg->p);
mbed714	0:d616ece2d859	1045	#if TCP_DEBUG
mbed714	0:d616ece2d859	1046	seg->p = NULL;
mbed714	0:d616ece2d859	1047	#endif /* TCP_DEBUG */
mbed714	0:d616ece2d859	1048	}
mbed714	0:d616ece2d859	1049	memp_free(MEMP_TCP_SEG, seg);
mbed714	0:d616ece2d859	1050	}
mbed714	0:d616ece2d859	1051	}
mbed714	0:d616ece2d859	1052
mbed714	0:d616ece2d859	1053	/**
mbed714	0:d616ece2d859	1054	* Sets the priority of a connection.
mbed714	0:d616ece2d859	1055	*
mbed714	0:d616ece2d859	1056	* @param pcb the tcp_pcb to manipulate
mbed714	0:d616ece2d859	1057	* @param prio new priority
mbed714	0:d616ece2d859	1058	*/
mbed714	0:d616ece2d859	1059	void
mbed714	0:d616ece2d859	1060	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
mbed714	0:d616ece2d859	1061	{
mbed714	0:d616ece2d859	1062	pcb->prio = prio;
mbed714	0:d616ece2d859	1063	}
mbed714	0:d616ece2d859	1064
mbed714	0:d616ece2d859	1065	#if TCP_QUEUE_OOSEQ
mbed714	0:d616ece2d859	1066	/**
mbed714	0:d616ece2d859	1067	* Returns a copy of the given TCP segment.
mbed714	0:d616ece2d859	1068	* The pbuf and data are not copied, only the pointers
mbed714	0:d616ece2d859	1069	*
mbed714	0:d616ece2d859	1070	* @param seg the old tcp_seg
mbed714	0:d616ece2d859	1071	* @return a copy of seg
mbed714	0:d616ece2d859	1072	*/
mbed714	0:d616ece2d859	1073	struct tcp_seg *
mbed714	0:d616ece2d859	1074	tcp_seg_copy(struct tcp_seg *seg)
mbed714	0:d616ece2d859	1075	{
mbed714	0:d616ece2d859	1076	struct tcp_seg *cseg;
mbed714	0:d616ece2d859	1077
mbed714	0:d616ece2d859	1078	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
mbed714	0:d616ece2d859	1079	if (cseg == NULL) {
mbed714	0:d616ece2d859	1080	return NULL;
mbed714	0:d616ece2d859	1081	}
mbed714	0:d616ece2d859	1082	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
mbed714	0:d616ece2d859	1083	pbuf_ref(cseg->p);
mbed714	0:d616ece2d859	1084	return cseg;
mbed714	0:d616ece2d859	1085	}
mbed714	0:d616ece2d859	1086	#endif /* TCP_QUEUE_OOSEQ */
mbed714	0:d616ece2d859	1087
mbed714	0:d616ece2d859	1088	#if LWIP_CALLBACK_API
mbed714	0:d616ece2d859	1089	/**
mbed714	0:d616ece2d859	1090	* Default receive callback that is called if the user didn't register
mbed714	0:d616ece2d859	1091	* a recv callback for the pcb.
mbed714	0:d616ece2d859	1092	*/
mbed714	0:d616ece2d859	1093	err_t
mbed714	0:d616ece2d859	1094	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
mbed714	0:d616ece2d859	1095	{
mbed714	0:d616ece2d859	1096	LWIP_UNUSED_ARG(arg);
mbed714	0:d616ece2d859	1097	if (p != NULL) {
mbed714	0:d616ece2d859	1098	tcp_recved(pcb, p->tot_len);
mbed714	0:d616ece2d859	1099	pbuf_free(p);
mbed714	0:d616ece2d859	1100	} else if (err == ERR_OK) {
mbed714	0:d616ece2d859	1101	return tcp_close(pcb);
mbed714	0:d616ece2d859	1102	}
mbed714	0:d616ece2d859	1103	return ERR_OK;
mbed714	0:d616ece2d859	1104	}
mbed714	0:d616ece2d859	1105	#endif /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	1106
mbed714	0:d616ece2d859	1107	/**
mbed714	0:d616ece2d859	1108	* Kills the oldest active connection that has lower priority than prio.
mbed714	0:d616ece2d859	1109	*
mbed714	0:d616ece2d859	1110	* @param prio minimum priority
mbed714	0:d616ece2d859	1111	*/
mbed714	0:d616ece2d859	1112	static void
mbed714	0:d616ece2d859	1113	tcp_kill_prio(u8_t prio)
mbed714	0:d616ece2d859	1114	{
mbed714	0:d616ece2d859	1115	struct tcp_pcb pcb, inactive;
mbed714	0:d616ece2d859	1116	u32_t inactivity;
mbed714	0:d616ece2d859	1117	u8_t mprio;
mbed714	0:d616ece2d859	1118
mbed714	0:d616ece2d859	1119
mbed714	0:d616ece2d859	1120	mprio = TCP_PRIO_MAX;
mbed714	0:d616ece2d859	1121
mbed714	0:d616ece2d859	1122	/* We kill the oldest active connection that has lower priority than prio. */
mbed714	0:d616ece2d859	1123	inactivity = 0;
mbed714	0:d616ece2d859	1124	inactive = NULL;
mbed714	0:d616ece2d859	1125	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mbed714	0:d616ece2d859	1126	if (pcb->prio <= prio &&
mbed714	0:d616ece2d859	1127	pcb->prio <= mprio &&
mbed714	0:d616ece2d859	1128	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
mbed714	0:d616ece2d859	1129	inactivity = tcp_ticks - pcb->tmr;
mbed714	0:d616ece2d859	1130	inactive = pcb;
mbed714	0:d616ece2d859	1131	mprio = pcb->prio;
mbed714	0:d616ece2d859	1132	}
mbed714	0:d616ece2d859	1133	}
mbed714	0:d616ece2d859	1134	if (inactive != NULL) {
mbed714	0:d616ece2d859	1135	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
mbed714	0:d616ece2d859	1136	(void *)inactive, inactivity));
mbed714	0:d616ece2d859	1137	tcp_abort(inactive);
mbed714	0:d616ece2d859	1138	}
mbed714	0:d616ece2d859	1139	}
mbed714	0:d616ece2d859	1140
mbed714	0:d616ece2d859	1141	/**
mbed714	0:d616ece2d859	1142	* Kills the oldest connection that is in TIME_WAIT state.
mbed714	0:d616ece2d859	1143	* Called from tcp_alloc() if no more connections are available.
mbed714	0:d616ece2d859	1144	*/
mbed714	0:d616ece2d859	1145	static void
mbed714	0:d616ece2d859	1146	tcp_kill_timewait(void)
mbed714	0:d616ece2d859	1147	{
mbed714	0:d616ece2d859	1148	struct tcp_pcb pcb, inactive;
mbed714	0:d616ece2d859	1149	u32_t inactivity;
mbed714	0:d616ece2d859	1150
mbed714	0:d616ece2d859	1151	inactivity = 0;
mbed714	0:d616ece2d859	1152	inactive = NULL;
mbed714	0:d616ece2d859	1153	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
mbed714	0:d616ece2d859	1154	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mbed714	0:d616ece2d859	1155	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
mbed714	0:d616ece2d859	1156	inactivity = tcp_ticks - pcb->tmr;
mbed714	0:d616ece2d859	1157	inactive = pcb;
mbed714	0:d616ece2d859	1158	}
mbed714	0:d616ece2d859	1159	}
mbed714	0:d616ece2d859	1160	if (inactive != NULL) {
mbed714	0:d616ece2d859	1161	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
mbed714	0:d616ece2d859	1162	(void *)inactive, inactivity));
mbed714	0:d616ece2d859	1163	tcp_abort(inactive);
mbed714	0:d616ece2d859	1164	}
mbed714	0:d616ece2d859	1165	}
mbed714	0:d616ece2d859	1166
mbed714	0:d616ece2d859	1167	/**
mbed714	0:d616ece2d859	1168	* Allocate a new tcp_pcb structure.
mbed714	0:d616ece2d859	1169	*
mbed714	0:d616ece2d859	1170	* @param prio priority for the new pcb
mbed714	0:d616ece2d859	1171	* @return a new tcp_pcb that initially is in state CLOSED
mbed714	0:d616ece2d859	1172	*/
mbed714	0:d616ece2d859	1173	struct tcp_pcb *
mbed714	0:d616ece2d859	1174	tcp_alloc(u8_t prio)
mbed714	0:d616ece2d859	1175	{
mbed714	0:d616ece2d859	1176	struct tcp_pcb *pcb;
mbed714	0:d616ece2d859	1177	u32_t iss;
mbed714	0:d616ece2d859	1178
mbed714	0:d616ece2d859	1179	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mbed714	0:d616ece2d859	1180	if (pcb == NULL) {
mbed714	0:d616ece2d859	1181	/* Try killing oldest connection in TIME-WAIT. */
mbed714	0:d616ece2d859	1182	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
mbed714	0:d616ece2d859	1183	tcp_kill_timewait();
mbed714	0:d616ece2d859	1184	/* Try to allocate a tcp_pcb again. */
mbed714	0:d616ece2d859	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mbed714	0:d616ece2d859	1186	if (pcb == NULL) {
mbed714	0:d616ece2d859	1187	/* Try killing active connections with lower priority than the new one. */
mbed714	0:d616ece2d859	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
mbed714	0:d616ece2d859	1189	tcp_kill_prio(prio);
mbed714	0:d616ece2d859	1190	/* Try to allocate a tcp_pcb again. */
mbed714	0:d616ece2d859	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mbed714	0:d616ece2d859	1192	if (pcb != NULL) {
mbed714	0:d616ece2d859	1193	/* adjust err stats: memp_malloc failed twice before */
mbed714	0:d616ece2d859	1194	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
mbed714	0:d616ece2d859	1195	}
mbed714	0:d616ece2d859	1196	}
mbed714	0:d616ece2d859	1197	if (pcb != NULL) {
mbed714	0:d616ece2d859	1198	/* adjust err stats: timewait PCB was freed above */
mbed714	0:d616ece2d859	1199	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
mbed714	0:d616ece2d859	1200	}
mbed714	0:d616ece2d859	1201	}
mbed714	0:d616ece2d859	1202	if (pcb != NULL) {
mbed714	0:d616ece2d859	1203	memset(pcb, 0, sizeof(struct tcp_pcb));
mbed714	0:d616ece2d859	1204	pcb->prio = prio;
mbed714	0:d616ece2d859	1205	pcb->snd_buf = TCP_SND_BUF;
mbed714	0:d616ece2d859	1206	pcb->snd_queuelen = 0;
mbed714	0:d616ece2d859	1207	pcb->rcv_wnd = TCP_WND;
mbed714	0:d616ece2d859	1208	pcb->rcv_ann_wnd = TCP_WND;
mbed714	0:d616ece2d859	1209	pcb->tos = 0;
mbed714	0:d616ece2d859	1210	pcb->ttl = TCP_TTL;
mbed714	0:d616ece2d859	1211	/* As initial send MSS, we use TCP_MSS but limit it to 536.
mbed714	0:d616ece2d859	1212	The send MSS is updated when an MSS option is received. */
mbed714	0:d616ece2d859	1213	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
mbed714	0:d616ece2d859	1214	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
mbed714	0:d616ece2d859	1215	pcb->sa = 0;
mbed714	0:d616ece2d859	1216	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
mbed714	0:d616ece2d859	1217	pcb->rtime = -1;
mbed714	0:d616ece2d859	1218	pcb->cwnd = 1;
mbed714	0:d616ece2d859	1219	iss = tcp_next_iss();
mbed714	0:d616ece2d859	1220	pcb->snd_wl2 = iss;
mbed714	0:d616ece2d859	1221	pcb->snd_nxt = iss;
mbed714	0:d616ece2d859	1222	pcb->lastack = iss;
mbed714	0:d616ece2d859	1223	pcb->snd_lbb = iss;
mbed714	0:d616ece2d859	1224	pcb->tmr = tcp_ticks;
mbed714	0:d616ece2d859	1225
mbed714	0:d616ece2d859	1226	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
mbed714	0:d616ece2d859	1227
mbed714	0:d616ece2d859	1228	pcb->polltmr = 0;
mbed714	0:d616ece2d859	1229
mbed714	0:d616ece2d859	1230	#if LWIP_CALLBACK_API
mbed714	0:d616ece2d859	1231	pcb->recv = tcp_recv_null;
mbed714	0:d616ece2d859	1232	#endif /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	1233
mbed714	0:d616ece2d859	1234	/* Init KEEPALIVE timer */
mbed714	0:d616ece2d859	1235	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
mbed714	0:d616ece2d859	1236
mbed714	0:d616ece2d859	1237	#if LWIP_TCP_KEEPALIVE
mbed714	0:d616ece2d859	1238	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
mbed714	0:d616ece2d859	1239	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
mbed714	0:d616ece2d859	1240	#endif /* LWIP_TCP_KEEPALIVE */
mbed714	0:d616ece2d859	1241
mbed714	0:d616ece2d859	1242	pcb->keep_cnt_sent = 0;
mbed714	0:d616ece2d859	1243	}
mbed714	0:d616ece2d859	1244	return pcb;
mbed714	0:d616ece2d859	1245	}
mbed714	0:d616ece2d859	1246
mbed714	0:d616ece2d859	1247	/**
mbed714	0:d616ece2d859	1248	* Creates a new TCP protocol control block but doesn't place it on
mbed714	0:d616ece2d859	1249	* any of the TCP PCB lists.
mbed714	0:d616ece2d859	1250	* The pcb is not put on any list until binding using tcp_bind().
mbed714	0:d616ece2d859	1251	*
mbed714	0:d616ece2d859	1252	* @internal: Maybe there should be a idle TCP PCB list where these
mbed714	0:d616ece2d859	1253	* PCBs are put on. Port reservation using tcp_bind() is implemented but
mbed714	0:d616ece2d859	1254	* allocated pcbs that are not bound can't be killed automatically if wanting
mbed714	0:d616ece2d859	1255	* to allocate a pcb with higher prio (@see tcp_kill_prio())
mbed714	0:d616ece2d859	1256	*
mbed714	0:d616ece2d859	1257	* @return a new tcp_pcb that initially is in state CLOSED
mbed714	0:d616ece2d859	1258	*/
mbed714	0:d616ece2d859	1259	struct tcp_pcb *
mbed714	0:d616ece2d859	1260	tcp_new(void)
mbed714	0:d616ece2d859	1261	{
mbed714	0:d616ece2d859	1262	return tcp_alloc(TCP_PRIO_NORMAL);
mbed714	0:d616ece2d859	1263	}
mbed714	0:d616ece2d859	1264
mbed714	0:d616ece2d859	1265	/**
mbed714	0:d616ece2d859	1266	* Used to specify the argument that should be passed callback
mbed714	0:d616ece2d859	1267	* functions.
mbed714	0:d616ece2d859	1268	*
mbed714	0:d616ece2d859	1269	* @param pcb tcp_pcb to set the callback argument
mbed714	0:d616ece2d859	1270	* @param arg void pointer argument to pass to callback functions
mbed714	0:d616ece2d859	1271	*/
mbed714	0:d616ece2d859	1272	void
mbed714	0:d616ece2d859	1273	tcp_arg(struct tcp_pcb pcb, void arg)
mbed714	0:d616ece2d859	1274	{
mbed714	0:d616ece2d859	1275	pcb->callback_arg = arg;
mbed714	0:d616ece2d859	1276	}
mbed714	0:d616ece2d859	1277	#if LWIP_CALLBACK_API
mbed714	0:d616ece2d859	1278
mbed714	0:d616ece2d859	1279	/**
mbed714	0:d616ece2d859	1280	* Used to specify the function that should be called when a TCP
mbed714	0:d616ece2d859	1281	* connection receives data.
mbed714	0:d616ece2d859	1282	*
mbed714	0:d616ece2d859	1283	* @param pcb tcp_pcb to set the recv callback
mbed714	0:d616ece2d859	1284	* @param recv callback function to call for this pcb when data is received
mbed714	0:d616ece2d859	1285	*/
mbed714	0:d616ece2d859	1286	void
mbed714	0:d616ece2d859	1287	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
mbed714	0:d616ece2d859	1288	{
mbed714	0:d616ece2d859	1289	pcb->recv = recv;
mbed714	0:d616ece2d859	1290	}
mbed714	0:d616ece2d859	1291
mbed714	0:d616ece2d859	1292	/**
mbed714	0:d616ece2d859	1293	* Used to specify the function that should be called when TCP data
mbed714	0:d616ece2d859	1294	* has been successfully delivered to the remote host.
mbed714	0:d616ece2d859	1295	*
mbed714	0:d616ece2d859	1296	* @param pcb tcp_pcb to set the sent callback
mbed714	0:d616ece2d859	1297	* @param sent callback function to call for this pcb when data is successfully sent
mbed714	0:d616ece2d859	1298	*/
mbed714	0:d616ece2d859	1299	void
mbed714	0:d616ece2d859	1300	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
mbed714	0:d616ece2d859	1301	{
mbed714	0:d616ece2d859	1302	pcb->sent = sent;
mbed714	0:d616ece2d859	1303	}
mbed714	0:d616ece2d859	1304
mbed714	0:d616ece2d859	1305	/**
mbed714	0:d616ece2d859	1306	* Used to specify the function that should be called when a fatal error
mbed714	0:d616ece2d859	1307	* has occured on the connection.
mbed714	0:d616ece2d859	1308	*
mbed714	0:d616ece2d859	1309	* @param pcb tcp_pcb to set the err callback
mbed714	0:d616ece2d859	1310	* @param err callback function to call for this pcb when a fatal error
mbed714	0:d616ece2d859	1311	* has occured on the connection
mbed714	0:d616ece2d859	1312	*/
mbed714	0:d616ece2d859	1313	void
mbed714	0:d616ece2d859	1314	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
mbed714	0:d616ece2d859	1315	{
mbed714	0:d616ece2d859	1316	pcb->errf = err;
mbed714	0:d616ece2d859	1317	}
mbed714	0:d616ece2d859	1318
mbed714	0:d616ece2d859	1319	/**
mbed714	0:d616ece2d859	1320	* Used for specifying the function that should be called when a
mbed714	0:d616ece2d859	1321	* LISTENing connection has been connected to another host.
mbed714	0:d616ece2d859	1322	*
mbed714	0:d616ece2d859	1323	* @param pcb tcp_pcb to set the accept callback
mbed714	0:d616ece2d859	1324	* @param accept callback function to call for this pcb when LISTENing
mbed714	0:d616ece2d859	1325	* connection has been connected to another host
mbed714	0:d616ece2d859	1326	*/
mbed714	0:d616ece2d859	1327	void
mbed714	0:d616ece2d859	1328	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
mbed714	0:d616ece2d859	1329	{
mbed714	0:d616ece2d859	1330	pcb->accept = accept;
mbed714	0:d616ece2d859	1331	}
mbed714	0:d616ece2d859	1332	#endif /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	1333
mbed714	0:d616ece2d859	1334
mbed714	0:d616ece2d859	1335	/**
mbed714	0:d616ece2d859	1336	* Used to specify the function that should be called periodically
mbed714	0:d616ece2d859	1337	* from TCP. The interval is specified in terms of the TCP coarse
mbed714	0:d616ece2d859	1338	* timer interval, which is called twice a second.
mbed714	0:d616ece2d859	1339	*
mbed714	0:d616ece2d859	1340	*/
mbed714	0:d616ece2d859	1341	void
mbed714	0:d616ece2d859	1342	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
mbed714	0:d616ece2d859	1343	{
mbed714	0:d616ece2d859	1344	#if LWIP_CALLBACK_API
mbed714	0:d616ece2d859	1345	pcb->poll = poll;
mbed714	0:d616ece2d859	1346	#else /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	1347	LWIP_UNUSED_ARG(poll);
mbed714	0:d616ece2d859	1348	#endif /* LWIP_CALLBACK_API */
mbed714	0:d616ece2d859	1349	pcb->pollinterval = interval;
mbed714	0:d616ece2d859	1350	}
mbed714	0:d616ece2d859	1351
mbed714	0:d616ece2d859	1352	/**
mbed714	0:d616ece2d859	1353	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
mbed714	0:d616ece2d859	1354	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
mbed714	0:d616ece2d859	1355	*
mbed714	0:d616ece2d859	1356	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
mbed714	0:d616ece2d859	1357	*/
mbed714	0:d616ece2d859	1358	void
mbed714	0:d616ece2d859	1359	tcp_pcb_purge(struct tcp_pcb *pcb)
mbed714	0:d616ece2d859	1360	{
mbed714	0:d616ece2d859	1361	if (pcb->state != CLOSED &&
mbed714	0:d616ece2d859	1362	pcb->state != TIME_WAIT &&
mbed714	0:d616ece2d859	1363	pcb->state != LISTEN) {
mbed714	0:d616ece2d859	1364
mbed714	0:d616ece2d859	1365	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
mbed714	0:d616ece2d859	1366
mbed714	0:d616ece2d859	1367	#if TCP_LISTEN_BACKLOG
mbed714	0:d616ece2d859	1368	if (pcb->state == SYN_RCVD) {
mbed714	0:d616ece2d859	1369	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
mbed714	0:d616ece2d859	1370	struct tcp_pcb_listen *lpcb;
mbed714	0:d616ece2d859	1371	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
mbed714	0:d616ece2d859	1372	tcp_listen_pcbs.listen_pcbs != NULL);
mbed714	0:d616ece2d859	1373	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
mbed714	0:d616ece2d859	1374	if ((lpcb->local_port == pcb->local_port) &&
mbed714	0:d616ece2d859	1375	(ip_addr_isany(&lpcb->local_ip) \|\|
mbed714	0:d616ece2d859	1376	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
mbed714	0:d616ece2d859	1377	/* port and address of the listen pcb match the timed-out pcb */
mbed714	0:d616ece2d859	1378	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
mbed714	0:d616ece2d859	1379	lpcb->accepts_pending > 0);
mbed714	0:d616ece2d859	1380	lpcb->accepts_pending--;
mbed714	0:d616ece2d859	1381	break;
mbed714	0:d616ece2d859	1382	}
mbed714	0:d616ece2d859	1383	}
mbed714	0:d616ece2d859	1384	}
mbed714	0:d616ece2d859	1385	#endif /* TCP_LISTEN_BACKLOG */
mbed714	0:d616ece2d859	1386
mbed714	0:d616ece2d859	1387
mbed714	0:d616ece2d859	1388	if (pcb->refused_data != NULL) {
mbed714	0:d616ece2d859	1389	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
mbed714	0:d616ece2d859	1390	pbuf_free(pcb->refused_data);
mbed714	0:d616ece2d859	1391	pcb->refused_data = NULL;
mbed714	0:d616ece2d859	1392	}
mbed714	0:d616ece2d859	1393	if (pcb->unsent != NULL) {
mbed714	0:d616ece2d859	1394	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
mbed714	0:d616ece2d859	1395	}
mbed714	0:d616ece2d859	1396	if (pcb->unacked != NULL) {
mbed714	0:d616ece2d859	1397	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
mbed714	0:d616ece2d859	1398	}
mbed714	0:d616ece2d859	1399	#if TCP_QUEUE_OOSEQ
mbed714	0:d616ece2d859	1400	if (pcb->ooseq != NULL) {
mbed714	0:d616ece2d859	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
mbed714	0:d616ece2d859	1402	}
mbed714	0:d616ece2d859	1403	tcp_segs_free(pcb->ooseq);
mbed714	0:d616ece2d859	1404	pcb->ooseq = NULL;
mbed714	0:d616ece2d859	1405	#endif /* TCP_QUEUE_OOSEQ */
mbed714	0:d616ece2d859	1406
mbed714	0:d616ece2d859	1407	/* Stop the retransmission timer as it will expect data on unacked
mbed714	0:d616ece2d859	1408	queue if it fires */
mbed714	0:d616ece2d859	1409	pcb->rtime = -1;
mbed714	0:d616ece2d859	1410
mbed714	0:d616ece2d859	1411	tcp_segs_free(pcb->unsent);
mbed714	0:d616ece2d859	1412	tcp_segs_free(pcb->unacked);
mbed714	0:d616ece2d859	1413	pcb->unacked = pcb->unsent = NULL;
mbed714	0:d616ece2d859	1414	#if TCP_OVERSIZE
mbed714	0:d616ece2d859	1415	pcb->unsent_oversize = 0;
mbed714	0:d616ece2d859	1416	#endif /* TCP_OVERSIZE */
mbed714	0:d616ece2d859	1417	}
mbed714	0:d616ece2d859	1418	}
mbed714	0:d616ece2d859	1419
mbed714	0:d616ece2d859	1420	/**
mbed714	0:d616ece2d859	1421	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
mbed714	0:d616ece2d859	1422	*
mbed714	0:d616ece2d859	1423	* @param pcblist PCB list to purge.
mbed714	0:d616ece2d859	1424	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
mbed714	0:d616ece2d859	1425	*/
mbed714	0:d616ece2d859	1426	void
mbed714	0:d616ece2d859	1427	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
mbed714	0:d616ece2d859	1428	{
mbed714	0:d616ece2d859	1429	TCP_RMV(pcblist, pcb);
mbed714	0:d616ece2d859	1430
mbed714	0:d616ece2d859	1431	tcp_pcb_purge(pcb);
mbed714	0:d616ece2d859	1432
mbed714	0:d616ece2d859	1433	/* if there is an outstanding delayed ACKs, send it */
mbed714	0:d616ece2d859	1434	if (pcb->state != TIME_WAIT &&
mbed714	0:d616ece2d859	1435	pcb->state != LISTEN &&
mbed714	0:d616ece2d859	1436	pcb->flags & TF_ACK_DELAY) {
mbed714	0:d616ece2d859	1437	pcb->flags \|= TF_ACK_NOW;
mbed714	0:d616ece2d859	1438	tcp_output(pcb);
mbed714	0:d616ece2d859	1439	}
mbed714	0:d616ece2d859	1440
mbed714	0:d616ece2d859	1441	if (pcb->state != LISTEN) {
mbed714	0:d616ece2d859	1442	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
mbed714	0:d616ece2d859	1443	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
mbed714	0:d616ece2d859	1444	#if TCP_QUEUE_OOSEQ
mbed714	0:d616ece2d859	1445	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
mbed714	0:d616ece2d859	1446	#endif /* TCP_QUEUE_OOSEQ */
mbed714	0:d616ece2d859	1447	}
mbed714	0:d616ece2d859	1448
mbed714	0:d616ece2d859	1449	pcb->state = CLOSED;
mbed714	0:d616ece2d859	1450
mbed714	0:d616ece2d859	1451	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
mbed714	0:d616ece2d859	1452	}
mbed714	0:d616ece2d859	1453
mbed714	0:d616ece2d859	1454	/**
mbed714	0:d616ece2d859	1455	* Calculates a new initial sequence number for new connections.
mbed714	0:d616ece2d859	1456	*
mbed714	0:d616ece2d859	1457	* @return u32_t pseudo random sequence number
mbed714	0:d616ece2d859	1458	*/
mbed714	0:d616ece2d859	1459	u32_t
mbed714	0:d616ece2d859	1460	tcp_next_iss(void)
mbed714	0:d616ece2d859	1461	{
mbed714	0:d616ece2d859	1462	static u32_t iss = 6510;
mbed714	0:d616ece2d859	1463
mbed714	0:d616ece2d859	1464	iss += tcp_ticks; /* XXX */
mbed714	0:d616ece2d859	1465	return iss;
mbed714	0:d616ece2d859	1466	}
mbed714	0:d616ece2d859	1467
mbed714	0:d616ece2d859	1468	#if TCP_CALCULATE_EFF_SEND_MSS
mbed714	0:d616ece2d859	1469	/**
mbed714	0:d616ece2d859	1470	* Calcluates the effective send mss that can be used for a specific IP address
mbed714	0:d616ece2d859	1471	* by using ip_route to determin the netif used to send to the address and
mbed714	0:d616ece2d859	1472	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
mbed714	0:d616ece2d859	1473	*/
mbed714	0:d616ece2d859	1474	u16_t
mbed714	0:d616ece2d859	1475	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
mbed714	0:d616ece2d859	1476	{
mbed714	0:d616ece2d859	1477	u16_t mss_s;
mbed714	0:d616ece2d859	1478	struct netif *outif;
mbed714	0:d616ece2d859	1479
mbed714	0:d616ece2d859	1480	outif = ip_route(addr);
mbed714	0:d616ece2d859	1481	if ((outif != NULL) && (outif->mtu != 0)) {
mbed714	0:d616ece2d859	1482	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
mbed714	0:d616ece2d859	1483	/* RFC 1122, chap 4.2.2.6:
mbed714	0:d616ece2d859	1484	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
mbed714	0:d616ece2d859	1485	* We correct for TCP options in tcp_write(), and don't support IP options.
mbed714	0:d616ece2d859	1486	*/
mbed714	0:d616ece2d859	1487	sendmss = LWIP_MIN(sendmss, mss_s);
mbed714	0:d616ece2d859	1488	}
mbed714	0:d616ece2d859	1489	return sendmss;
mbed714	0:d616ece2d859	1490	}
mbed714	0:d616ece2d859	1491	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
mbed714	0:d616ece2d859	1492
mbed714	0:d616ece2d859	1493	const char*
mbed714	0:d616ece2d859	1494	tcp_debug_state_str(enum tcp_state s)
mbed714	0:d616ece2d859	1495	{
mbed714	0:d616ece2d859	1496	return tcp_state_str[s];
mbed714	0:d616ece2d859	1497	}
mbed714	0:d616ece2d859	1498
mbed714	0:d616ece2d859	1499	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
mbed714	0:d616ece2d859	1500	/**
mbed714	0:d616ece2d859	1501	* Print a tcp header for debugging purposes.
mbed714	0:d616ece2d859	1502	*
mbed714	0:d616ece2d859	1503	* @param tcphdr pointer to a struct tcp_hdr
mbed714	0:d616ece2d859	1504	*/
mbed714	0:d616ece2d859	1505	void
mbed714	0:d616ece2d859	1506	tcp_debug_print(struct tcp_hdr *tcphdr)
mbed714	0:d616ece2d859	1507	{
mbed714	0:d616ece2d859	1508	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
mbed714	0:d616ece2d859	1509	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:d616ece2d859	1510	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
mbed714	0:d616ece2d859	1511	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
mbed714	0:d616ece2d859	1512	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:d616ece2d859	1513	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
mbed714	0:d616ece2d859	1514	ntohl(tcphdr->seqno)));
mbed714	0:d616ece2d859	1515	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:d616ece2d859	1516	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
mbed714	0:d616ece2d859	1517	ntohl(tcphdr->ackno)));
mbed714	0:d616ece2d859	1518	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:d616ece2d859	1519	LWIP_DEBUGF(TCP_DEBUG, ("\| %2"U16_F" \| \|%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"\| %5"U16_F" \| (hdrlen, flags (",
mbed714	0:d616ece2d859	1520	TCPH_HDRLEN(tcphdr),
mbed714	0:d616ece2d859	1521	TCPH_FLAGS(tcphdr) >> 5 & 1,
mbed714	0:d616ece2d859	1522	TCPH_FLAGS(tcphdr) >> 4 & 1,
mbed714	0:d616ece2d859	1523	TCPH_FLAGS(tcphdr) >> 3 & 1,
mbed714	0:d616ece2d859	1524	TCPH_FLAGS(tcphdr) >> 2 & 1,
mbed714	0:d616ece2d859	1525	TCPH_FLAGS(tcphdr) >> 1 & 1,
mbed714	0:d616ece2d859	1526	TCPH_FLAGS(tcphdr) & 1,
mbed714	0:d616ece2d859	1527	ntohs(tcphdr->wnd)));
mbed714	0:d616ece2d859	1528	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
mbed714	0:d616ece2d859	1529	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
mbed714	0:d616ece2d859	1530	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:d616ece2d859	1531	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
mbed714	0:d616ece2d859	1532	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
mbed714	0:d616ece2d859	1533	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:d616ece2d859	1534	}
mbed714	0:d616ece2d859	1535
mbed714	0:d616ece2d859	1536	/**
mbed714	0:d616ece2d859	1537	* Print a tcp state for debugging purposes.
mbed714	0:d616ece2d859	1538	*
mbed714	0:d616ece2d859	1539	* @param s enum tcp_state to print
mbed714	0:d616ece2d859	1540	*/
mbed714	0:d616ece2d859	1541	void
mbed714	0:d616ece2d859	1542	tcp_debug_print_state(enum tcp_state s)
mbed714	0:d616ece2d859	1543	{
mbed714	0:d616ece2d859	1544	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
mbed714	0:d616ece2d859	1545	}
mbed714	0:d616ece2d859	1546
mbed714	0:d616ece2d859	1547	/**
mbed714	0:d616ece2d859	1548	* Print tcp flags for debugging purposes.
mbed714	0:d616ece2d859	1549	*
mbed714	0:d616ece2d859	1550	* @param flags tcp flags, all active flags are printed
mbed714	0:d616ece2d859	1551	*/
mbed714	0:d616ece2d859	1552	void
mbed714	0:d616ece2d859	1553	tcp_debug_print_flags(u8_t flags)
mbed714	0:d616ece2d859	1554	{
mbed714	0:d616ece2d859	1555	if (flags & TCP_FIN) {
mbed714	0:d616ece2d859	1556	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
mbed714	0:d616ece2d859	1557	}
mbed714	0:d616ece2d859	1558	if (flags & TCP_SYN) {
mbed714	0:d616ece2d859	1559	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
mbed714	0:d616ece2d859	1560	}
mbed714	0:d616ece2d859	1561	if (flags & TCP_RST) {
mbed714	0:d616ece2d859	1562	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
mbed714	0:d616ece2d859	1563	}
mbed714	0:d616ece2d859	1564	if (flags & TCP_PSH) {
mbed714	0:d616ece2d859	1565	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
mbed714	0:d616ece2d859	1566	}
mbed714	0:d616ece2d859	1567	if (flags & TCP_ACK) {
mbed714	0:d616ece2d859	1568	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
mbed714	0:d616ece2d859	1569	}
mbed714	0:d616ece2d859	1570	if (flags & TCP_URG) {
mbed714	0:d616ece2d859	1571	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
mbed714	0:d616ece2d859	1572	}
mbed714	0:d616ece2d859	1573	if (flags & TCP_ECE) {
mbed714	0:d616ece2d859	1574	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
mbed714	0:d616ece2d859	1575	}
mbed714	0:d616ece2d859	1576	if (flags & TCP_CWR) {
mbed714	0:d616ece2d859	1577	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
mbed714	0:d616ece2d859	1578	}
mbed714	0:d616ece2d859	1579	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
mbed714	0:d616ece2d859	1580	}
mbed714	0:d616ece2d859	1581
mbed714	0:d616ece2d859	1582	/**
mbed714	0:d616ece2d859	1583	* Print all tcp_pcbs in every list for debugging purposes.
mbed714	0:d616ece2d859	1584	*/
mbed714	0:d616ece2d859	1585	void
mbed714	0:d616ece2d859	1586	tcp_debug_print_pcbs(void)
mbed714	0:d616ece2d859	1587	{
mbed714	0:d616ece2d859	1588	struct tcp_pcb *pcb;
mbed714	0:d616ece2d859	1589	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
mbed714	0:d616ece2d859	1590	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mbed714	0:d616ece2d859	1591	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mbed714	0:d616ece2d859	1592	pcb->local_port, pcb->remote_port,
mbed714	0:d616ece2d859	1593	pcb->snd_nxt, pcb->rcv_nxt));
mbed714	0:d616ece2d859	1594	tcp_debug_print_state(pcb->state);
mbed714	0:d616ece2d859	1595	}
mbed714	0:d616ece2d859	1596	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
mbed714	0:d616ece2d859	1597	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
mbed714	0:d616ece2d859	1598	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mbed714	0:d616ece2d859	1599	pcb->local_port, pcb->remote_port,
mbed714	0:d616ece2d859	1600	pcb->snd_nxt, pcb->rcv_nxt));
mbed714	0:d616ece2d859	1601	tcp_debug_print_state(pcb->state);
mbed714	0:d616ece2d859	1602	}
mbed714	0:d616ece2d859	1603	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
mbed714	0:d616ece2d859	1604	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mbed714	0:d616ece2d859	1605	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mbed714	0:d616ece2d859	1606	pcb->local_port, pcb->remote_port,
mbed714	0:d616ece2d859	1607	pcb->snd_nxt, pcb->rcv_nxt));
mbed714	0:d616ece2d859	1608	tcp_debug_print_state(pcb->state);
mbed714	0:d616ece2d859	1609	}
mbed714	0:d616ece2d859	1610	}
mbed714	0:d616ece2d859	1611
mbed714	0:d616ece2d859	1612	/**
mbed714	0:d616ece2d859	1613	* Check state consistency of the tcp_pcb lists.
mbed714	0:d616ece2d859	1614	*/
mbed714	0:d616ece2d859	1615	s16_t
mbed714	0:d616ece2d859	1616	tcp_pcbs_sane(void)
mbed714	0:d616ece2d859	1617	{
mbed714	0:d616ece2d859	1618	struct tcp_pcb *pcb;
mbed714	0:d616ece2d859	1619	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mbed714	0:d616ece2d859	1620	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
mbed714	0:d616ece2d859	1621	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
mbed714	0:d616ece2d859	1622	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
mbed714	0:d616ece2d859	1623	}
mbed714	0:d616ece2d859	1624	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mbed714	0:d616ece2d859	1625	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
mbed714	0:d616ece2d859	1626	}
mbed714	0:d616ece2d859	1627	return 1;
mbed714	0:d616ece2d859	1628	}
mbed714	0:d616ece2d859	1629	#endif /* TCP_DEBUG */
mbed714	0:d616ece2d859	1630
mbed714	0:d616ece2d859	1631	#endif /* LWIP_TCP */

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Type:	Library
Created:	18 Sep 2010
Imports:	1
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

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lwip/core/tcp.c@0:d616ece2d859, 2010-09-18 (annotated)

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