ZG2100NetIfSource - ZG2100 Network interface source

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ZG2100 Network interface source

lwip/core/tcp.c@4:e00281c7453d, 2010-08-06 (annotated)

Committer:: donatien
Date:: Fri Aug 06 10:46:03 2010 +0000
Revision:: 4:e00281c7453d
Parent:: 1:3a7c15057192

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	0:b802fc31f1db	1	/**
donatien	0:b802fc31f1db	2	* @file
donatien	0:b802fc31f1db	3	* Transmission Control Protocol for IP
donatien	0:b802fc31f1db	4	*
donatien	0:b802fc31f1db	5	* This file contains common functions for the TCP implementation, such as functinos
donatien	0:b802fc31f1db	6	* for manipulating the data structures and the TCP timer functions. TCP functions
donatien	0:b802fc31f1db	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
donatien	0:b802fc31f1db	8	*
donatien	0:b802fc31f1db	9	*/
donatien	0:b802fc31f1db	10
donatien	0:b802fc31f1db	11	/*
donatien	0:b802fc31f1db	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
donatien	0:b802fc31f1db	13	* All rights reserved.
donatien	0:b802fc31f1db	14	*
donatien	0:b802fc31f1db	15	* Redistribution and use in source and binary forms, with or without modification,
donatien	0:b802fc31f1db	16	* are permitted provided that the following conditions are met:
donatien	0:b802fc31f1db	17	*
donatien	0:b802fc31f1db	18	* 1. Redistributions of source code must retain the above copyright notice,
donatien	0:b802fc31f1db	19	* this list of conditions and the following disclaimer.
donatien	0:b802fc31f1db	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
donatien	0:b802fc31f1db	21	* this list of conditions and the following disclaimer in the documentation
donatien	0:b802fc31f1db	22	* and/or other materials provided with the distribution.
donatien	0:b802fc31f1db	23	* 3. The name of the author may not be used to endorse or promote products
donatien	0:b802fc31f1db	24	* derived from this software without specific prior written permission.
donatien	0:b802fc31f1db	25	*
donatien	0:b802fc31f1db	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien	0:b802fc31f1db	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien	0:b802fc31f1db	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien	0:b802fc31f1db	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien	0:b802fc31f1db	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien	0:b802fc31f1db	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	0:b802fc31f1db	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien	0:b802fc31f1db	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien	0:b802fc31f1db	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien	0:b802fc31f1db	35	* OF SUCH DAMAGE.
donatien	0:b802fc31f1db	36	*
donatien	0:b802fc31f1db	37	* This file is part of the lwIP TCP/IP stack.
donatien	0:b802fc31f1db	38	*
donatien	0:b802fc31f1db	39	* Author: Adam Dunkels <adam@sics.se>
donatien	0:b802fc31f1db	40	*
donatien	0:b802fc31f1db	41	*/
donatien	0:b802fc31f1db	42
donatien	0:b802fc31f1db	43	#include "lwip/opt.h"
donatien	0:b802fc31f1db	44
donatien	0:b802fc31f1db	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
donatien	0:b802fc31f1db	46
donatien	0:b802fc31f1db	47	#include "lwip/def.h"
donatien	0:b802fc31f1db	48	#include "lwip/mem.h"
donatien	0:b802fc31f1db	49	#include "lwip/memp.h"
donatien	0:b802fc31f1db	50	#include "lwip/snmp.h"
donatien	0:b802fc31f1db	51	#include "lwip/tcp.h"
donatien	0:b802fc31f1db	52	#include "lwip/tcp_impl.h"
donatien	0:b802fc31f1db	53	#include "lwip/debug.h"
donatien	0:b802fc31f1db	54	#include "lwip/stats.h"
donatien	0:b802fc31f1db	55
donatien	0:b802fc31f1db	56	#include <string.h>
donatien	0:b802fc31f1db	57
donatien	1:3a7c15057192	58	const char * const tcp_state_str[] = {
donatien	0:b802fc31f1db	59	"CLOSED",
donatien	0:b802fc31f1db	60	"LISTEN",
donatien	0:b802fc31f1db	61	"SYN_SENT",
donatien	0:b802fc31f1db	62	"SYN_RCVD",
donatien	0:b802fc31f1db	63	"ESTABLISHED",
donatien	0:b802fc31f1db	64	"FIN_WAIT_1",
donatien	0:b802fc31f1db	65	"FIN_WAIT_2",
donatien	0:b802fc31f1db	66	"CLOSE_WAIT",
donatien	0:b802fc31f1db	67	"CLOSING",
donatien	0:b802fc31f1db	68	"LAST_ACK",
donatien	0:b802fc31f1db	69	"TIME_WAIT"
donatien	0:b802fc31f1db	70	};
donatien	0:b802fc31f1db	71
donatien	0:b802fc31f1db	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
donatien	0:b802fc31f1db	73	u32_t tcp_ticks;
donatien	0:b802fc31f1db	74	const u8_t tcp_backoff[13] =
donatien	0:b802fc31f1db	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
donatien	0:b802fc31f1db	76	/* Times per slowtmr hits */
donatien	0:b802fc31f1db	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
donatien	0:b802fc31f1db	78
donatien	0:b802fc31f1db	79	/* The TCP PCB lists. */
donatien	0:b802fc31f1db	80
donatien	0:b802fc31f1db	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
donatien	0:b802fc31f1db	82	struct tcp_pcb *tcp_bound_pcbs;
donatien	0:b802fc31f1db	83	/** List of all TCP PCBs in LISTEN state */
donatien	0:b802fc31f1db	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
donatien	0:b802fc31f1db	85	/** List of all TCP PCBs that are in a state in which
donatien	0:b802fc31f1db	86	* they accept or send data. */
donatien	0:b802fc31f1db	87	struct tcp_pcb *tcp_active_pcbs;
donatien	0:b802fc31f1db	88	/** List of all TCP PCBs in TIME-WAIT state */
donatien	0:b802fc31f1db	89	struct tcp_pcb *tcp_tw_pcbs;
donatien	0:b802fc31f1db	90
donatien	1:3a7c15057192	91	#define NUM_TCP_PCB_LISTS 4
donatien	1:3a7c15057192	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
donatien	1:3a7c15057192	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
donatien	1:3a7c15057192	94	struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
donatien	1:3a7c15057192	95	&tcp_active_pcbs, &tcp_tw_pcbs};
donatien	1:3a7c15057192	96
donatien	0:b802fc31f1db	97	/** Only used for temporary storage. */
donatien	0:b802fc31f1db	98	struct tcp_pcb *tcp_tmp_pcb;
donatien	0:b802fc31f1db	99
donatien	0:b802fc31f1db	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
donatien	0:b802fc31f1db	101	static u8_t tcp_timer;
donatien	0:b802fc31f1db	102	static u16_t tcp_new_port(void);
donatien	0:b802fc31f1db	103
donatien	0:b802fc31f1db	104	/**
donatien	0:b802fc31f1db	105	* Called periodically to dispatch TCP timers.
donatien	0:b802fc31f1db	106	*
donatien	0:b802fc31f1db	107	*/
donatien	0:b802fc31f1db	108	void
donatien	0:b802fc31f1db	109	tcp_tmr(void)
donatien	0:b802fc31f1db	110	{
donatien	0:b802fc31f1db	111	/* Call tcp_fasttmr() every 250 ms */
donatien	0:b802fc31f1db	112	tcp_fasttmr();
donatien	0:b802fc31f1db	113
donatien	0:b802fc31f1db	114	if (++tcp_timer & 1) {
donatien	0:b802fc31f1db	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
donatien	0:b802fc31f1db	116	tcp_tmr() is called. */
donatien	0:b802fc31f1db	117	tcp_slowtmr();
donatien	0:b802fc31f1db	118	}
donatien	0:b802fc31f1db	119	}
donatien	0:b802fc31f1db	120
donatien	0:b802fc31f1db	121	/**
donatien	0:b802fc31f1db	122	* Closes the TX side of a connection held by the PCB.
donatien	0:b802fc31f1db	123	* For tcp_close(), a RST is sent if the application didn't receive all data
donatien	0:b802fc31f1db	124	* (tcp_recved() not called for all data passed to recv callback).
donatien	0:b802fc31f1db	125	*
donatien	0:b802fc31f1db	126	* Listening pcbs are freed and may not be referenced any more.
donatien	0:b802fc31f1db	127	* Connection pcbs are freed if not yet connected and may not be referenced
donatien	0:b802fc31f1db	128	* any more. If a connection is established (at least SYN received or in
donatien	0:b802fc31f1db	129	* a closing state), the connection is closed, and put in a closing state.
donatien	0:b802fc31f1db	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
donatien	0:b802fc31f1db	131	* unsafe to reference it.
donatien	0:b802fc31f1db	132	*
donatien	0:b802fc31f1db	133	* @param pcb the tcp_pcb to close
donatien	0:b802fc31f1db	134	* @return ERR_OK if connection has been closed
donatien	0:b802fc31f1db	135	* another err_t if closing failed and pcb is not freed
donatien	0:b802fc31f1db	136	*/
donatien	0:b802fc31f1db	137	static err_t
donatien	0:b802fc31f1db	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
donatien	0:b802fc31f1db	139	{
donatien	0:b802fc31f1db	140	err_t err;
donatien	0:b802fc31f1db	141
donatien	0:b802fc31f1db	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
donatien	1:3a7c15057192	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
donatien	0:b802fc31f1db	144	/* Not all data received by application, send RST to tell the remote
donatien	0:b802fc31f1db	145	side about this. */
donatien	1:3a7c15057192	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
donatien	1:3a7c15057192	147
donatien	1:3a7c15057192	148	/* don't call tcp_abort here: we must not deallocate the pcb since
donatien	1:3a7c15057192	149	that might not be expected when calling tcp_close */
donatien	0:b802fc31f1db	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
donatien	0:b802fc31f1db	151	pcb->local_port, pcb->remote_port);
donatien	1:3a7c15057192	152
donatien	1:3a7c15057192	153	tcp_pcb_purge(pcb);
donatien	1:3a7c15057192	154
donatien	1:3a7c15057192	155	/* TODO: to which state do we move now? */
donatien	1:3a7c15057192	156
donatien	1:3a7c15057192	157	/* move to TIME_WAIT since we close actively */
donatien	1:3a7c15057192	158	TCP_RMV(&tcp_active_pcbs, pcb);
donatien	1:3a7c15057192	159	pcb->state = TIME_WAIT;
donatien	1:3a7c15057192	160	TCP_REG(&tcp_tw_pcbs, pcb);
donatien	1:3a7c15057192	161
donatien	1:3a7c15057192	162	return ERR_OK;
donatien	0:b802fc31f1db	163	}
donatien	0:b802fc31f1db	164	}
donatien	0:b802fc31f1db	165
donatien	0:b802fc31f1db	166	switch (pcb->state) {
donatien	0:b802fc31f1db	167	case CLOSED:
donatien	0:b802fc31f1db	168	/* Closing a pcb in the CLOSED state might seem erroneous,
donatien	0:b802fc31f1db	169	* however, it is in this state once allocated and as yet unused
donatien	0:b802fc31f1db	170	* and the user needs some way to free it should the need arise.
donatien	0:b802fc31f1db	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
donatien	0:b802fc31f1db	172	* or for a pcb that has been used and then entered the CLOSED state
donatien	0:b802fc31f1db	173	* is erroneous, but this should never happen as the pcb has in those cases
donatien	0:b802fc31f1db	174	* been freed, and so any remaining handles are bogus. */
donatien	0:b802fc31f1db	175	err = ERR_OK;
donatien	0:b802fc31f1db	176	TCP_RMV(&tcp_bound_pcbs, pcb);
donatien	0:b802fc31f1db	177	memp_free(MEMP_TCP_PCB, pcb);
donatien	0:b802fc31f1db	178	pcb = NULL;
donatien	0:b802fc31f1db	179	break;
donatien	0:b802fc31f1db	180	case LISTEN:
donatien	0:b802fc31f1db	181	err = ERR_OK;
donatien	1:3a7c15057192	182	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
donatien	0:b802fc31f1db	183	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
donatien	0:b802fc31f1db	184	pcb = NULL;
donatien	0:b802fc31f1db	185	break;
donatien	0:b802fc31f1db	186	case SYN_SENT:
donatien	0:b802fc31f1db	187	err = ERR_OK;
donatien	0:b802fc31f1db	188	tcp_pcb_remove(&tcp_active_pcbs, pcb);
donatien	0:b802fc31f1db	189	memp_free(MEMP_TCP_PCB, pcb);
donatien	0:b802fc31f1db	190	pcb = NULL;
donatien	0:b802fc31f1db	191	snmp_inc_tcpattemptfails();
donatien	0:b802fc31f1db	192	break;
donatien	0:b802fc31f1db	193	case SYN_RCVD:
donatien	0:b802fc31f1db	194	err = tcp_send_fin(pcb);
donatien	0:b802fc31f1db	195	if (err == ERR_OK) {
donatien	0:b802fc31f1db	196	snmp_inc_tcpattemptfails();
donatien	0:b802fc31f1db	197	pcb->state = FIN_WAIT_1;
donatien	0:b802fc31f1db	198	}
donatien	0:b802fc31f1db	199	break;
donatien	0:b802fc31f1db	200	case ESTABLISHED:
donatien	0:b802fc31f1db	201	err = tcp_send_fin(pcb);
donatien	0:b802fc31f1db	202	if (err == ERR_OK) {
donatien	0:b802fc31f1db	203	snmp_inc_tcpestabresets();
donatien	0:b802fc31f1db	204	pcb->state = FIN_WAIT_1;
donatien	0:b802fc31f1db	205	}
donatien	0:b802fc31f1db	206	break;
donatien	0:b802fc31f1db	207	case CLOSE_WAIT:
donatien	0:b802fc31f1db	208	err = tcp_send_fin(pcb);
donatien	0:b802fc31f1db	209	if (err == ERR_OK) {
donatien	0:b802fc31f1db	210	snmp_inc_tcpestabresets();
donatien	0:b802fc31f1db	211	pcb->state = LAST_ACK;
donatien	0:b802fc31f1db	212	}
donatien	0:b802fc31f1db	213	break;
donatien	0:b802fc31f1db	214	default:
donatien	0:b802fc31f1db	215	/* Has already been closed, do nothing. */
donatien	0:b802fc31f1db	216	err = ERR_OK;
donatien	0:b802fc31f1db	217	pcb = NULL;
donatien	0:b802fc31f1db	218	break;
donatien	0:b802fc31f1db	219	}
donatien	0:b802fc31f1db	220
donatien	0:b802fc31f1db	221	if (pcb != NULL && err == ERR_OK) {
donatien	0:b802fc31f1db	222	/* To ensure all data has been sent when tcp_close returns, we have
donatien	0:b802fc31f1db	223	to make sure tcp_output doesn't fail.
donatien	0:b802fc31f1db	224	Since we don't really have to ensure all data has been sent when tcp_close
donatien	0:b802fc31f1db	225	returns (unsent data is sent from tcp timer functions, also), we don't care
donatien	0:b802fc31f1db	226	for the return value of tcp_output for now. */
donatien	0:b802fc31f1db	227	/* @todo: When implementing SO_LINGER, this must be changed somehow:
donatien	0:b802fc31f1db	228	If SOF_LINGER is set, the data should be sent and acked before close returns.
donatien	0:b802fc31f1db	229	This can only be valid for sequential APIs, not for the raw API. */
donatien	0:b802fc31f1db	230	tcp_output(pcb);
donatien	0:b802fc31f1db	231	}
donatien	0:b802fc31f1db	232	return err;
donatien	0:b802fc31f1db	233	}
donatien	0:b802fc31f1db	234
donatien	0:b802fc31f1db	235	/**
donatien	0:b802fc31f1db	236	* Closes the connection held by the PCB.
donatien	0:b802fc31f1db	237	*
donatien	0:b802fc31f1db	238	* Listening pcbs are freed and may not be referenced any more.
donatien	0:b802fc31f1db	239	* Connection pcbs are freed if not yet connected and may not be referenced
donatien	0:b802fc31f1db	240	* any more. If a connection is established (at least SYN received or in
donatien	0:b802fc31f1db	241	* a closing state), the connection is closed, and put in a closing state.
donatien	0:b802fc31f1db	242	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
donatien	0:b802fc31f1db	243	* unsafe to reference it (unless an error is returned).
donatien	0:b802fc31f1db	244	*
donatien	0:b802fc31f1db	245	* @param pcb the tcp_pcb to close
donatien	0:b802fc31f1db	246	* @return ERR_OK if connection has been closed
donatien	0:b802fc31f1db	247	* another err_t if closing failed and pcb is not freed
donatien	0:b802fc31f1db	248	*/
donatien	0:b802fc31f1db	249	err_t
donatien	0:b802fc31f1db	250	tcp_close(struct tcp_pcb *pcb)
donatien	0:b802fc31f1db	251	{
donatien	0:b802fc31f1db	252	#if TCP_DEBUG
donatien	0:b802fc31f1db	253	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
donatien	0:b802fc31f1db	254	tcp_debug_print_state(pcb->state);
donatien	0:b802fc31f1db	255	#endif /* TCP_DEBUG */
donatien	0:b802fc31f1db	256
donatien	0:b802fc31f1db	257	if (pcb->state != LISTEN) {
donatien	0:b802fc31f1db	258	/* Set a flag not to receive any more data... */
donatien	0:b802fc31f1db	259	pcb->flags \|= TF_RXCLOSED;
donatien	0:b802fc31f1db	260	}
donatien	0:b802fc31f1db	261	/* ... and close */
donatien	0:b802fc31f1db	262	return tcp_close_shutdown(pcb, 1);
donatien	0:b802fc31f1db	263	}
donatien	0:b802fc31f1db	264
donatien	0:b802fc31f1db	265	/**
donatien	0:b802fc31f1db	266	* Causes all or part of a full-duplex connection of this PCB to be shut down.
donatien	0:b802fc31f1db	267	* This doesn't deallocate the PCB!
donatien	0:b802fc31f1db	268	*
donatien	0:b802fc31f1db	269	* @param pcb PCB to shutdown
donatien	0:b802fc31f1db	270	* @param shut_rx shut down receive side if this is != 0
donatien	0:b802fc31f1db	271	* @param shut_tx shut down send side if this is != 0
donatien	0:b802fc31f1db	272	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
donatien	0:b802fc31f1db	273	* another err_t on error.
donatien	0:b802fc31f1db	274	*/
donatien	0:b802fc31f1db	275	err_t
donatien	0:b802fc31f1db	276	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
donatien	0:b802fc31f1db	277	{
donatien	0:b802fc31f1db	278	if (pcb->state == LISTEN) {
donatien	0:b802fc31f1db	279	return ERR_CONN;
donatien	0:b802fc31f1db	280	}
donatien	0:b802fc31f1db	281	if (shut_rx) {
donatien	0:b802fc31f1db	282	/* shut down the receive side: free buffered data... */
donatien	0:b802fc31f1db	283	if (pcb->refused_data != NULL) {
donatien	0:b802fc31f1db	284	pbuf_free(pcb->refused_data);
donatien	0:b802fc31f1db	285	pcb->refused_data = NULL;
donatien	0:b802fc31f1db	286	}
donatien	0:b802fc31f1db	287	/* ... and set a flag not to receive any more data */
donatien	0:b802fc31f1db	288	pcb->flags \|= TF_RXCLOSED;
donatien	0:b802fc31f1db	289	}
donatien	0:b802fc31f1db	290	if (shut_tx) {
donatien	0:b802fc31f1db	291	/* This can't happen twice since if it succeeds, the pcb's state is changed.
donatien	0:b802fc31f1db	292	Only close in these states as the others directly deallocate the PCB */
donatien	0:b802fc31f1db	293	switch (pcb->state) {
donatien	0:b802fc31f1db	294	case SYN_RCVD:
donatien	0:b802fc31f1db	295	case ESTABLISHED:
donatien	0:b802fc31f1db	296	case CLOSE_WAIT:
donatien	0:b802fc31f1db	297	return tcp_close_shutdown(pcb, 0);
donatien	0:b802fc31f1db	298	default:
donatien	0:b802fc31f1db	299	/* don't shut down other states */
donatien	0:b802fc31f1db	300	break;
donatien	0:b802fc31f1db	301	}
donatien	0:b802fc31f1db	302	}
donatien	0:b802fc31f1db	303	/* @todo: return another err_t if not in correct state or already shut? */
donatien	0:b802fc31f1db	304	return ERR_OK;
donatien	0:b802fc31f1db	305	}
donatien	0:b802fc31f1db	306
donatien	0:b802fc31f1db	307	/**
donatien	0:b802fc31f1db	308	* Abandons a connection and optionally sends a RST to the remote
donatien	0:b802fc31f1db	309	* host. Deletes the local protocol control block. This is done when
donatien	0:b802fc31f1db	310	* a connection is killed because of shortage of memory.
donatien	0:b802fc31f1db	311	*
donatien	0:b802fc31f1db	312	* @param pcb the tcp_pcb to abort
donatien	0:b802fc31f1db	313	* @param reset boolean to indicate whether a reset should be sent
donatien	0:b802fc31f1db	314	*/
donatien	0:b802fc31f1db	315	void
donatien	0:b802fc31f1db	316	tcp_abandon(struct tcp_pcb *pcb, int reset)
donatien	0:b802fc31f1db	317	{
donatien	0:b802fc31f1db	318	u32_t seqno, ackno;
donatien	0:b802fc31f1db	319	u16_t remote_port, local_port;
donatien	0:b802fc31f1db	320	ip_addr_t remote_ip, local_ip;
donatien	0:b802fc31f1db	321	#if LWIP_CALLBACK_API
donatien	0:b802fc31f1db	322	tcp_err_fn errf;
donatien	0:b802fc31f1db	323	#endif /* LWIP_CALLBACK_API */
donatien	0:b802fc31f1db	324	void *errf_arg;
donatien	0:b802fc31f1db	325
donatien	1:3a7c15057192	326	/* pcb->state LISTEN not allowed here */
donatien	1:3a7c15057192	327	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
donatien	1:3a7c15057192	328	pcb->state != LISTEN);
donatien	0:b802fc31f1db	329	/* Figure out on which TCP PCB list we are, and remove us. If we
donatien	0:b802fc31f1db	330	are in an active state, call the receive function associated with
donatien	0:b802fc31f1db	331	the PCB with a NULL argument, and send an RST to the remote end. */
donatien	0:b802fc31f1db	332	if (pcb->state == TIME_WAIT) {
donatien	0:b802fc31f1db	333	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
donatien	0:b802fc31f1db	334	memp_free(MEMP_TCP_PCB, pcb);
donatien	0:b802fc31f1db	335	} else {
donatien	0:b802fc31f1db	336	seqno = pcb->snd_nxt;
donatien	0:b802fc31f1db	337	ackno = pcb->rcv_nxt;
donatien	0:b802fc31f1db	338	ip_addr_copy(local_ip, pcb->local_ip);
donatien	0:b802fc31f1db	339	ip_addr_copy(remote_ip, pcb->remote_ip);
donatien	0:b802fc31f1db	340	local_port = pcb->local_port;
donatien	0:b802fc31f1db	341	remote_port = pcb->remote_port;
donatien	0:b802fc31f1db	342	#if LWIP_CALLBACK_API
donatien	0:b802fc31f1db	343	errf = pcb->errf;
donatien	0:b802fc31f1db	344	#endif /* LWIP_CALLBACK_API */
donatien	0:b802fc31f1db	345	errf_arg = pcb->callback_arg;
donatien	0:b802fc31f1db	346	tcp_pcb_remove(&tcp_active_pcbs, pcb);
donatien	0:b802fc31f1db	347	if (pcb->unacked != NULL) {
donatien	0:b802fc31f1db	348	tcp_segs_free(pcb->unacked);
donatien	0:b802fc31f1db	349	}
donatien	0:b802fc31f1db	350	if (pcb->unsent != NULL) {
donatien	0:b802fc31f1db	351	tcp_segs_free(pcb->unsent);
donatien	0:b802fc31f1db	352	}
donatien	0:b802fc31f1db	353	#if TCP_QUEUE_OOSEQ
donatien	0:b802fc31f1db	354	if (pcb->ooseq != NULL) {
donatien	0:b802fc31f1db	355	tcp_segs_free(pcb->ooseq);
donatien	0:b802fc31f1db	356	}
donatien	0:b802fc31f1db	357	#endif /* TCP_QUEUE_OOSEQ */
donatien	0:b802fc31f1db	358	memp_free(MEMP_TCP_PCB, pcb);
donatien	0:b802fc31f1db	359	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
donatien	0:b802fc31f1db	360	if (reset) {
donatien	0:b802fc31f1db	361	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
donatien	0:b802fc31f1db	362	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
donatien	0:b802fc31f1db	363	}
donatien	0:b802fc31f1db	364	}
donatien	0:b802fc31f1db	365	}
donatien	0:b802fc31f1db	366
donatien	0:b802fc31f1db	367	/**
donatien	0:b802fc31f1db	368	* Aborts the connection by sending a RST (reset) segment to the remote
donatien	0:b802fc31f1db	369	* host. The pcb is deallocated. This function never fails.
donatien	0:b802fc31f1db	370	*
donatien	0:b802fc31f1db	371	* ATTENTION: When calling this from one of the TCP callbacks, make
donatien	0:b802fc31f1db	372	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
donatien	0:b802fc31f1db	373	* or you will risk accessing deallocated memory or memory leaks!
donatien	0:b802fc31f1db	374	*
donatien	0:b802fc31f1db	375	* @param pcb the tcp pcb to abort
donatien	0:b802fc31f1db	376	*/
donatien	0:b802fc31f1db	377	void
donatien	0:b802fc31f1db	378	tcp_abort(struct tcp_pcb *pcb)
donatien	0:b802fc31f1db	379	{
donatien	0:b802fc31f1db	380	tcp_abandon(pcb, 1);
donatien	0:b802fc31f1db	381	}
donatien	0:b802fc31f1db	382
donatien	0:b802fc31f1db	383	/**
donatien	0:b802fc31f1db	384	* Binds the connection to a local portnumber and IP address. If the
donatien	0:b802fc31f1db	385	* IP address is not given (i.e., ipaddr == NULL), the IP address of
donatien	0:b802fc31f1db	386	* the outgoing network interface is used instead.
donatien	0:b802fc31f1db	387	*
donatien	0:b802fc31f1db	388	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
donatien	0:b802fc31f1db	389	* already bound!)
donatien	0:b802fc31f1db	390	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
donatien	0:b802fc31f1db	391	* to any local address
donatien	0:b802fc31f1db	392	* @param port the local port to bind to
donatien	0:b802fc31f1db	393	* @return ERR_USE if the port is already in use
donatien	0:b802fc31f1db	394	* ERR_OK if bound
donatien	0:b802fc31f1db	395	*/
donatien	0:b802fc31f1db	396	err_t
donatien	0:b802fc31f1db	397	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
donatien	0:b802fc31f1db	398	{
donatien	1:3a7c15057192	399	int i;
donatien	1:3a7c15057192	400	int max_pcb_list = NUM_TCP_PCB_LISTS;
donatien	0:b802fc31f1db	401	struct tcp_pcb *cpcb;
donatien	0:b802fc31f1db	402
donatien	0:b802fc31f1db	403	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
donatien	0:b802fc31f1db	404
donatien	1:3a7c15057192	405	#if SO_REUSE
donatien	1:3a7c15057192	406	/* Unless the REUSEADDR flag is set,
donatien	1:3a7c15057192	407	we have to check the pcbs in TIME-WAIT state, also.
donatien	1:3a7c15057192	408	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
donatien	1:3a7c15057192	409	packets using both local and remote IP addresses and ports to distinguish.
donatien	1:3a7c15057192	410	*/
donatien	1:3a7c15057192	411	#if SO_REUSE
donatien	1:3a7c15057192	412	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
donatien	1:3a7c15057192	413	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
donatien	1:3a7c15057192	414	}
donatien	1:3a7c15057192	415	#endif /* SO_REUSE */
donatien	1:3a7c15057192	416	#endif /* SO_REUSE */
donatien	1:3a7c15057192	417
donatien	0:b802fc31f1db	418	if (port == 0) {
donatien	0:b802fc31f1db	419	port = tcp_new_port();
donatien	0:b802fc31f1db	420	}
donatien	1:3a7c15057192	421
donatien	1:3a7c15057192	422	/* Check if the address already is in use (on all lists) */
donatien	1:3a7c15057192	423	for (i = 0; i < max_pcb_list; i++) {
donatien	1:3a7c15057192	424	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
donatien	0:b802fc31f1db	425	if (cpcb->local_port == port) {
donatien	1:3a7c15057192	426	#if SO_REUSE
donatien	1:3a7c15057192	427	/* Omit checking for the same port if both pcbs have REUSEADDR set.
donatien	1:3a7c15057192	428	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
donatien	1:3a7c15057192	429	tcp_connect. */
donatien	1:3a7c15057192	430	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
donatien	1:3a7c15057192	431	((cpcb->so_options & SOF_REUSEADDR) == 0))
donatien	1:3a7c15057192	432	#endif /* SO_REUSE */
donatien	1:3a7c15057192	433	{
donatien	1:3a7c15057192	434	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
donatien	1:3a7c15057192	435	ip_addr_isany(ipaddr) \|\|
donatien	1:3a7c15057192	436	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
donatien	1:3a7c15057192	437	return ERR_USE;
donatien	1:3a7c15057192	438	}
donatien	0:b802fc31f1db	439	}
donatien	0:b802fc31f1db	440	}
donatien	0:b802fc31f1db	441	}
donatien	0:b802fc31f1db	442	}
donatien	0:b802fc31f1db	443
donatien	0:b802fc31f1db	444	if (!ip_addr_isany(ipaddr)) {
donatien	0:b802fc31f1db	445	pcb->local_ip = *ipaddr;
donatien	0:b802fc31f1db	446	}
donatien	0:b802fc31f1db	447	pcb->local_port = port;
donatien	0:b802fc31f1db	448	TCP_REG(&tcp_bound_pcbs, pcb);
donatien	0:b802fc31f1db	449	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
donatien	0:b802fc31f1db	450	return ERR_OK;
donatien	0:b802fc31f1db	451	}
donatien	0:b802fc31f1db	452	#if LWIP_CALLBACK_API
donatien	0:b802fc31f1db	453	/**
donatien	0:b802fc31f1db	454	* Default accept callback if no accept callback is specified by the user.
donatien	0:b802fc31f1db	455	*/
donatien	0:b802fc31f1db	456	static err_t
donatien	0:b802fc31f1db	457	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
donatien	0:b802fc31f1db	458	{
donatien	0:b802fc31f1db	459	LWIP_UNUSED_ARG(arg);
donatien	0:b802fc31f1db	460	LWIP_UNUSED_ARG(pcb);
donatien	0:b802fc31f1db	461	LWIP_UNUSED_ARG(err);
donatien	0:b802fc31f1db	462
donatien	0:b802fc31f1db	463	return ERR_ABRT;
donatien	0:b802fc31f1db	464	}
donatien	0:b802fc31f1db	465	#endif /* LWIP_CALLBACK_API */
donatien	0:b802fc31f1db	466
donatien	0:b802fc31f1db	467	/**
donatien	0:b802fc31f1db	468	* Set the state of the connection to be LISTEN, which means that it
donatien	0:b802fc31f1db	469	* is able to accept incoming connections. The protocol control block
donatien	0:b802fc31f1db	470	* is reallocated in order to consume less memory. Setting the
donatien	0:b802fc31f1db	471	* connection to LISTEN is an irreversible process.
donatien	0:b802fc31f1db	472	*
donatien	0:b802fc31f1db	473	* @param pcb the original tcp_pcb
donatien	0:b802fc31f1db	474	* @param backlog the incoming connections queue limit
donatien	0:b802fc31f1db	475	* @return tcp_pcb used for listening, consumes less memory.
donatien	0:b802fc31f1db	476	*
donatien	0:b802fc31f1db	477	* @note The original tcp_pcb is freed. This function therefore has to be
donatien	0:b802fc31f1db	478	* called like this:
donatien	0:b802fc31f1db	479	* tpcb = tcp_listen(tpcb);
donatien	0:b802fc31f1db	480	*/
donatien	0:b802fc31f1db	481	struct tcp_pcb *
donatien	0:b802fc31f1db	482	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
donatien	0:b802fc31f1db	483	{
donatien	0:b802fc31f1db	484	struct tcp_pcb_listen *lpcb;
donatien	0:b802fc31f1db	485
donatien	0:b802fc31f1db	486	LWIP_UNUSED_ARG(backlog);
donatien	0:b802fc31f1db	487	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
donatien	0:b802fc31f1db	488
donatien	0:b802fc31f1db	489	/* already listening? */
donatien	0:b802fc31f1db	490	if (pcb->state == LISTEN) {
donatien	0:b802fc31f1db	491	return pcb;
donatien	0:b802fc31f1db	492	}
donatien	1:3a7c15057192	493	#if SO_REUSE
donatien	1:3a7c15057192	494	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
donatien	1:3a7c15057192	495	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
donatien	1:3a7c15057192	496	is declared (listen-/connection-pcb), we have to make sure now that
donatien	1:3a7c15057192	497	this port is only used once for every local IP. */
donatien	1:3a7c15057192	498	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
donatien	1:3a7c15057192	499	if (lpcb->local_port == pcb->local_port) {
donatien	1:3a7c15057192	500	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
donatien	1:3a7c15057192	501	/* this address/port is already used */
donatien	1:3a7c15057192	502	return NULL;
donatien	1:3a7c15057192	503	}
donatien	1:3a7c15057192	504	}
donatien	1:3a7c15057192	505	}
donatien	1:3a7c15057192	506	}
donatien	1:3a7c15057192	507	#endif /* SO_REUSE */
donatien	0:b802fc31f1db	508	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
donatien	0:b802fc31f1db	509	if (lpcb == NULL) {
donatien	0:b802fc31f1db	510	return NULL;
donatien	0:b802fc31f1db	511	}
donatien	0:b802fc31f1db	512	lpcb->callback_arg = pcb->callback_arg;
donatien	0:b802fc31f1db	513	lpcb->local_port = pcb->local_port;
donatien	0:b802fc31f1db	514	lpcb->state = LISTEN;
donatien	1:3a7c15057192	515	lpcb->prio = pcb->prio;
donatien	0:b802fc31f1db	516	lpcb->so_options = pcb->so_options;
donatien	0:b802fc31f1db	517	lpcb->so_options \|= SOF_ACCEPTCONN;
donatien	0:b802fc31f1db	518	lpcb->ttl = pcb->ttl;
donatien	0:b802fc31f1db	519	lpcb->tos = pcb->tos;
donatien	0:b802fc31f1db	520	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
donatien	0:b802fc31f1db	521	TCP_RMV(&tcp_bound_pcbs, pcb);
donatien	0:b802fc31f1db	522	memp_free(MEMP_TCP_PCB, pcb);
donatien	0:b802fc31f1db	523	#if LWIP_CALLBACK_API
donatien	0:b802fc31f1db	524	lpcb->accept = tcp_accept_null;
donatien	0:b802fc31f1db	525	#endif /* LWIP_CALLBACK_API */
donatien	0:b802fc31f1db	526	#if TCP_LISTEN_BACKLOG
donatien	0:b802fc31f1db	527	lpcb->accepts_pending = 0;
donatien	0:b802fc31f1db	528	lpcb->backlog = (backlog ? backlog : 1);
donatien	0:b802fc31f1db	529	#endif /* TCP_LISTEN_BACKLOG */
donatien	1:3a7c15057192	530	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
donatien	0:b802fc31f1db	531	return (struct tcp_pcb *)lpcb;
donatien	0:b802fc31f1db	532	}
donatien	0:b802fc31f1db	533
donatien	0:b802fc31f1db	534	/**
donatien	0:b802fc31f1db	535	* Update the state that tracks the available window space to advertise.
donatien	0:b802fc31f1db	536	*
donatien	0:b802fc31f1db	537	* Returns how much extra window would be advertised if we sent an
donatien	0:b802fc31f1db	538	* update now.
donatien	0:b802fc31f1db	539	*/
donatien	0:b802fc31f1db	540	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
donatien	0:b802fc31f1db	541	{
donatien	0:b802fc31f1db	542	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
donatien	0:b802fc31f1db	543
donatien	0:b802fc31f1db	544	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
donatien	0:b802fc31f1db	545	/* we can advertise more window */
donatien	0:b802fc31f1db	546	pcb->rcv_ann_wnd = pcb->rcv_wnd;
donatien	0:b802fc31f1db	547	return new_right_edge - pcb->rcv_ann_right_edge;
donatien	0:b802fc31f1db	548	} else {
donatien	0:b802fc31f1db	549	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
donatien	0:b802fc31f1db	550	/* Can happen due to other end sending out of advertised window,
donatien	0:b802fc31f1db	551	* but within actual available (but not yet advertised) window */
donatien	0:b802fc31f1db	552	pcb->rcv_ann_wnd = 0;
donatien	0:b802fc31f1db	553	} else {
donatien	0:b802fc31f1db	554	/* keep the right edge of window constant */
donatien	0:b802fc31f1db	555	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
donatien	0:b802fc31f1db	556	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
donatien	0:b802fc31f1db	557	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
donatien	0:b802fc31f1db	558	}
donatien	0:b802fc31f1db	559	return 0;
donatien	0:b802fc31f1db	560	}
donatien	0:b802fc31f1db	561	}
donatien	0:b802fc31f1db	562
donatien	0:b802fc31f1db	563	/**
donatien	0:b802fc31f1db	564	* This function should be called by the application when it has
donatien	0:b802fc31f1db	565	* processed the data. The purpose is to advertise a larger window
donatien	0:b802fc31f1db	566	* when the data has been processed.
donatien	0:b802fc31f1db	567	*
donatien	0:b802fc31f1db	568	* @param pcb the tcp_pcb for which data is read
donatien	0:b802fc31f1db	569	* @param len the amount of bytes that have been read by the application
donatien	0:b802fc31f1db	570	*/
donatien	0:b802fc31f1db	571	void
donatien	0:b802fc31f1db	572	tcp_recved(struct tcp_pcb *pcb, u16_t len)
donatien	0:b802fc31f1db	573	{
donatien	0:b802fc31f1db	574	int wnd_inflation;
donatien	0:b802fc31f1db	575
donatien	0:b802fc31f1db	576	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
donatien	0:b802fc31f1db	577	len <= 0xffff - pcb->rcv_wnd );
donatien	0:b802fc31f1db	578
donatien	0:b802fc31f1db	579	pcb->rcv_wnd += len;
donatien	0:b802fc31f1db	580	if (pcb->rcv_wnd > TCP_WND) {
donatien	0:b802fc31f1db	581	pcb->rcv_wnd = TCP_WND;
donatien	0:b802fc31f1db	582	}
donatien	0:b802fc31f1db	583
donatien	0:b802fc31f1db	584	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
donatien	0:b802fc31f1db	585
donatien	0:b802fc31f1db	586	/* If the change in the right edge of window is significant (default
donatien	0:b802fc31f1db	587	* watermark is TCP_WND/4), then send an explicit update now.
donatien	0:b802fc31f1db	588	* Otherwise wait for a packet to be sent in the normal course of
donatien	0:b802fc31f1db	589	* events (or more window to be available later) */
donatien	0:b802fc31f1db	590	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
donatien	0:b802fc31f1db	591	tcp_ack_now(pcb);
donatien	0:b802fc31f1db	592	tcp_output(pcb);
donatien	0:b802fc31f1db	593	}
donatien	0:b802fc31f1db	594
donatien	0:b802fc31f1db	595	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
donatien	0:b802fc31f1db	596	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
donatien	0:b802fc31f1db	597	}
donatien	0:b802fc31f1db	598
donatien	0:b802fc31f1db	599	/**
donatien	0:b802fc31f1db	600	* A nastly hack featuring 'goto' statements that allocates a
donatien	0:b802fc31f1db	601	* new TCP local port.
donatien	0:b802fc31f1db	602	*
donatien	0:b802fc31f1db	603	* @return a new (free) local TCP port number
donatien	0:b802fc31f1db	604	*/
donatien	0:b802fc31f1db	605	static u16_t
donatien	0:b802fc31f1db	606	tcp_new_port(void)
donatien	0:b802fc31f1db	607	{
donatien	1:3a7c15057192	608	int i;
donatien	0:b802fc31f1db	609	struct tcp_pcb *pcb;
donatien	0:b802fc31f1db	610	#ifndef TCP_LOCAL_PORT_RANGE_START
donatien	0:b802fc31f1db	611	#define TCP_LOCAL_PORT_RANGE_START 4096
donatien	0:b802fc31f1db	612	#define TCP_LOCAL_PORT_RANGE_END 0x7fff
donatien	0:b802fc31f1db	613	#endif
donatien	0:b802fc31f1db	614	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
donatien	0:b802fc31f1db	615
donatien	0:b802fc31f1db	616	again:
donatien	0:b802fc31f1db	617	if (++port > TCP_LOCAL_PORT_RANGE_END) {
donatien	0:b802fc31f1db	618	port = TCP_LOCAL_PORT_RANGE_START;
donatien	0:b802fc31f1db	619	}
donatien	1:3a7c15057192	620	/* Check all PCB lists. */
donatien	1:3a7c15057192	621	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
donatien	1:3a7c15057192	622	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
donatien	1:3a7c15057192	623	if (pcb->local_port == port) {
donatien	1:3a7c15057192	624	goto again;
donatien	1:3a7c15057192	625	}
donatien	0:b802fc31f1db	626	}
donatien	0:b802fc31f1db	627	}
donatien	0:b802fc31f1db	628	return port;
donatien	0:b802fc31f1db	629	}
donatien	0:b802fc31f1db	630
donatien	0:b802fc31f1db	631	/**
donatien	0:b802fc31f1db	632	* Connects to another host. The function given as the "connected"
donatien	0:b802fc31f1db	633	* argument will be called when the connection has been established.
donatien	0:b802fc31f1db	634	*
donatien	0:b802fc31f1db	635	* @param pcb the tcp_pcb used to establish the connection
donatien	0:b802fc31f1db	636	* @param ipaddr the remote ip address to connect to
donatien	0:b802fc31f1db	637	* @param port the remote tcp port to connect to
donatien	0:b802fc31f1db	638	* @param connected callback function to call when connected (or on error)
donatien	0:b802fc31f1db	639	* @return ERR_VAL if invalid arguments are given
donatien	0:b802fc31f1db	640	* ERR_OK if connect request has been sent
donatien	0:b802fc31f1db	641	* other err_t values if connect request couldn't be sent
donatien	0:b802fc31f1db	642	*/
donatien	0:b802fc31f1db	643	err_t
donatien	0:b802fc31f1db	644	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
donatien	0:b802fc31f1db	645	tcp_connected_fn connected)
donatien	0:b802fc31f1db	646	{
donatien	0:b802fc31f1db	647	err_t ret;
donatien	0:b802fc31f1db	648	u32_t iss;
donatien	0:b802fc31f1db	649
donatien	0:b802fc31f1db	650	LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
donatien	0:b802fc31f1db	651
donatien	0:b802fc31f1db	652	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
donatien	0:b802fc31f1db	653	if (ipaddr != NULL) {
donatien	0:b802fc31f1db	654	pcb->remote_ip = *ipaddr;
donatien	0:b802fc31f1db	655	} else {
donatien	0:b802fc31f1db	656	return ERR_VAL;
donatien	0:b802fc31f1db	657	}
donatien	0:b802fc31f1db	658	pcb->remote_port = port;
donatien	1:3a7c15057192	659
donatien	1:3a7c15057192	660	/* check if we have a route to the remote host */
donatien	1:3a7c15057192	661	if (ip_addr_isany(&(pcb->local_ip))) {
donatien	1:3a7c15057192	662	/* no local IP address set, yet. */
donatien	1:3a7c15057192	663	struct netif *netif = ip_route(&(pcb->remote_ip));
donatien	1:3a7c15057192	664	if (netif == NULL) {
donatien	1:3a7c15057192	665	/* Don't even try to send a SYN packet if we have no route
donatien	1:3a7c15057192	666	since that will fail. */
donatien	1:3a7c15057192	667	return ERR_RTE;
donatien	1:3a7c15057192	668	}
donatien	1:3a7c15057192	669	/* Use the netif's IP address as local address. */
donatien	1:3a7c15057192	670	ip_addr_copy(pcb->local_ip, netif->ip_addr);
donatien	1:3a7c15057192	671	}
donatien	1:3a7c15057192	672
donatien	0:b802fc31f1db	673	if (pcb->local_port == 0) {
donatien	0:b802fc31f1db	674	pcb->local_port = tcp_new_port();
donatien	0:b802fc31f1db	675	}
donatien	1:3a7c15057192	676	#if SO_REUSE
donatien	1:3a7c15057192	677	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
donatien	1:3a7c15057192	678	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
donatien	1:3a7c15057192	679	now that the 5-tuple is unique. */
donatien	1:3a7c15057192	680	struct tcp_pcb *cpcb;
donatien	1:3a7c15057192	681	int i;
donatien	1:3a7c15057192	682	/* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
donatien	1:3a7c15057192	683	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
donatien	1:3a7c15057192	684	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
donatien	1:3a7c15057192	685	if ((cpcb->local_port == pcb->local_port) &&
donatien	1:3a7c15057192	686	(cpcb->remote_port == port) &&
donatien	1:3a7c15057192	687	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
donatien	1:3a7c15057192	688	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
donatien	1:3a7c15057192	689	/* linux returns EISCONN here, but ERR_USE should be OK for us */
donatien	1:3a7c15057192	690	return ERR_USE;
donatien	1:3a7c15057192	691	}
donatien	1:3a7c15057192	692	}
donatien	1:3a7c15057192	693	}
donatien	1:3a7c15057192	694	}
donatien	1:3a7c15057192	695	#endif /* SO_REUSE */
donatien	0:b802fc31f1db	696	iss = tcp_next_iss();
donatien	0:b802fc31f1db	697	pcb->rcv_nxt = 0;
donatien	0:b802fc31f1db	698	pcb->snd_nxt = iss;
donatien	0:b802fc31f1db	699	pcb->lastack = iss - 1;
donatien	0:b802fc31f1db	700	pcb->snd_lbb = iss - 1;
donatien	0:b802fc31f1db	701	pcb->rcv_wnd = TCP_WND;
donatien	0:b802fc31f1db	702	pcb->rcv_ann_wnd = TCP_WND;
donatien	0:b802fc31f1db	703	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
donatien	0:b802fc31f1db	704	pcb->snd_wnd = TCP_WND;
donatien	0:b802fc31f1db	705	/* As initial send MSS, we use TCP_MSS but limit it to 536.
donatien	0:b802fc31f1db	706	The send MSS is updated when an MSS option is received. */
donatien	0:b802fc31f1db	707	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
donatien	0:b802fc31f1db	708	#if TCP_CALCULATE_EFF_SEND_MSS
donatien	0:b802fc31f1db	709	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
donatien	0:b802fc31f1db	710	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
donatien	0:b802fc31f1db	711	pcb->cwnd = 1;
donatien	0:b802fc31f1db	712	pcb->ssthresh = pcb->mss * 10;
donatien	0:b802fc31f1db	713	#if LWIP_CALLBACK_API
donatien	0:b802fc31f1db	714	pcb->connected = connected;
donatien	1:3a7c15057192	715	#else /* LWIP_CALLBACK_API */
donatien	1:3a7c15057192	716	LWIP_UNUSED_ARG(connected);
donatien	0:b802fc31f1db	717	#endif /* LWIP_CALLBACK_API */
donatien	0:b802fc31f1db	718
donatien	1:3a7c15057192	719	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
donatien	1:3a7c15057192	720
donatien	0:b802fc31f1db	721	/* Send a SYN together with the MSS option. */
donatien	0:b802fc31f1db	722	ret = tcp_enqueue_flags(pcb, TCP_SYN);
donatien	0:b802fc31f1db	723	if (ret == ERR_OK) {
donatien	0:b802fc31f1db	724	/* SYN segment was enqueued, changed the pcbs state now */
donatien	0:b802fc31f1db	725	pcb->state = SYN_SENT;
donatien	0:b802fc31f1db	726	TCP_RMV(&tcp_bound_pcbs, pcb);
donatien	0:b802fc31f1db	727	TCP_REG(&tcp_active_pcbs, pcb);
donatien	0:b802fc31f1db	728	snmp_inc_tcpactiveopens();
donatien	0:b802fc31f1db	729
donatien	0:b802fc31f1db	730	tcp_output(pcb);
donatien	0:b802fc31f1db	731	}
donatien	0:b802fc31f1db	732	return ret;
donatien	0:b802fc31f1db	733	}
donatien	0:b802fc31f1db	734
donatien	0:b802fc31f1db	735	/**
donatien	0:b802fc31f1db	736	* Called every 500 ms and implements the retransmission timer and the timer that
donatien	0:b802fc31f1db	737	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
donatien	0:b802fc31f1db	738	* various timers such as the inactivity timer in each PCB.
donatien	0:b802fc31f1db	739	*
donatien	0:b802fc31f1db	740	* Automatically called from tcp_tmr().
donatien	0:b802fc31f1db	741	*/
donatien	0:b802fc31f1db	742	void
donatien	0:b802fc31f1db	743	tcp_slowtmr(void)
donatien	0:b802fc31f1db	744	{
donatien	0:b802fc31f1db	745	struct tcp_pcb pcb, pcb2, *prev;
donatien	0:b802fc31f1db	746	u16_t eff_wnd;
donatien	0:b802fc31f1db	747	u8_t pcb_remove; /* flag if a PCB should be removed */
donatien	0:b802fc31f1db	748	u8_t pcb_reset; /* flag if a RST should be sent when removing */
donatien	0:b802fc31f1db	749	err_t err;
donatien	1:3a7c15057192	750
donatien	1:3a7c15057192	751	tcp_debug_print_pcbs(); //DG
donatien	0:b802fc31f1db	752
donatien	0:b802fc31f1db	753	err = ERR_OK;
donatien	0:b802fc31f1db	754
donatien	0:b802fc31f1db	755	++tcp_ticks;
donatien	1:3a7c15057192	756	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
donatien	0:b802fc31f1db	757
donatien	0:b802fc31f1db	758	/* Steps through all of the active PCBs. */
donatien	0:b802fc31f1db	759	prev = NULL;
donatien	0:b802fc31f1db	760	pcb = tcp_active_pcbs;
donatien	0:b802fc31f1db	761	if (pcb == NULL) {
donatien	0:b802fc31f1db	762	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
donatien	0:b802fc31f1db	763	}
donatien	0:b802fc31f1db	764	while (pcb != NULL) {
donatien	0:b802fc31f1db	765	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
donatien	0:b802fc31f1db	766	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
donatien	0:b802fc31f1db	767	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
donatien	0:b802fc31f1db	768	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
donatien	0:b802fc31f1db	769
donatien	0:b802fc31f1db	770	pcb_remove = 0;
donatien	0:b802fc31f1db	771	pcb_reset = 0;
donatien	0:b802fc31f1db	772
donatien	0:b802fc31f1db	773	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
donatien	0:b802fc31f1db	774	++pcb_remove;
donatien	0:b802fc31f1db	775	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
donatien	0:b802fc31f1db	776	}
donatien	0:b802fc31f1db	777	else if (pcb->nrtx == TCP_MAXRTX) {
donatien	0:b802fc31f1db	778	++pcb_remove;
donatien	0:b802fc31f1db	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
donatien	0:b802fc31f1db	780	} else {
donatien	0:b802fc31f1db	781	if (pcb->persist_backoff > 0) {
donatien	0:b802fc31f1db	782	/* If snd_wnd is zero, use persist timer to send 1 byte probes
donatien	0:b802fc31f1db	783	* instead of using the standard retransmission mechanism. */
donatien	0:b802fc31f1db	784	pcb->persist_cnt++;
donatien	0:b802fc31f1db	785	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
donatien	0:b802fc31f1db	786	pcb->persist_cnt = 0;
donatien	0:b802fc31f1db	787	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
donatien	0:b802fc31f1db	788	pcb->persist_backoff++;
donatien	0:b802fc31f1db	789	}
donatien	0:b802fc31f1db	790	tcp_zero_window_probe(pcb);
donatien	0:b802fc31f1db	791	}
donatien	0:b802fc31f1db	792	} else {
donatien	0:b802fc31f1db	793	/* Increase the retransmission timer if it is running */
donatien	0:b802fc31f1db	794	if(pcb->rtime >= 0)
donatien	0:b802fc31f1db	795	++pcb->rtime;
donatien	0:b802fc31f1db	796
donatien	0:b802fc31f1db	797	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
donatien	0:b802fc31f1db	798	/* Time for a retransmission. */
donatien	0:b802fc31f1db	799	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
donatien	0:b802fc31f1db	800	" pcb->rto %"S16_F"\n",
donatien	0:b802fc31f1db	801	pcb->rtime, pcb->rto));
donatien	0:b802fc31f1db	802
donatien	0:b802fc31f1db	803	/* Double retransmission time-out unless we are trying to
donatien	0:b802fc31f1db	804	* connect to somebody (i.e., we are in SYN_SENT). */
donatien	0:b802fc31f1db	805	if (pcb->state != SYN_SENT) {
donatien	0:b802fc31f1db	806	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
donatien	0:b802fc31f1db	807	}
donatien	0:b802fc31f1db	808
donatien	0:b802fc31f1db	809	/* Reset the retransmission timer. */
donatien	0:b802fc31f1db	810	pcb->rtime = 0;
donatien	0:b802fc31f1db	811
donatien	0:b802fc31f1db	812	/* Reduce congestion window and ssthresh. */
donatien	0:b802fc31f1db	813	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
donatien	0:b802fc31f1db	814	pcb->ssthresh = eff_wnd >> 1;
donatien	0:b802fc31f1db	815	if (pcb->ssthresh < (pcb->mss << 1)) {
donatien	0:b802fc31f1db	816	pcb->ssthresh = (pcb->mss << 1);
donatien	0:b802fc31f1db	817	}
donatien	0:b802fc31f1db	818	pcb->cwnd = pcb->mss;
donatien	0:b802fc31f1db	819	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
donatien	0:b802fc31f1db	820	" ssthresh %"U16_F"\n",
donatien	0:b802fc31f1db	821	pcb->cwnd, pcb->ssthresh));
donatien	0:b802fc31f1db	822
donatien	0:b802fc31f1db	823	/* The following needs to be called AFTER cwnd is set to one
donatien	0:b802fc31f1db	824	mss - STJ */
donatien	0:b802fc31f1db	825	tcp_rexmit_rto(pcb);
donatien	0:b802fc31f1db	826	}
donatien	0:b802fc31f1db	827	}
donatien	0:b802fc31f1db	828	}
donatien	0:b802fc31f1db	829	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
donatien	0:b802fc31f1db	830	if (pcb->state == FIN_WAIT_2) {
donatien	0:b802fc31f1db	831	if ((u32_t)(tcp_ticks - pcb->tmr) >
donatien	0:b802fc31f1db	832	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
donatien	0:b802fc31f1db	833	++pcb_remove;
donatien	0:b802fc31f1db	834	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
donatien	0:b802fc31f1db	835	}
donatien	0:b802fc31f1db	836	}
donatien	0:b802fc31f1db	837
donatien	0:b802fc31f1db	838	/* Check if KEEPALIVE should be sent */
donatien	0:b802fc31f1db	839	if((pcb->so_options & SOF_KEEPALIVE) &&
donatien	0:b802fc31f1db	840	((pcb->state == ESTABLISHED) \|\|
donatien	0:b802fc31f1db	841	(pcb->state == CLOSE_WAIT))) {
donatien	0:b802fc31f1db	842	#if LWIP_TCP_KEEPALIVE
donatien	0:b802fc31f1db	843	if((u32_t)(tcp_ticks - pcb->tmr) >
donatien	0:b802fc31f1db	844	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
donatien	0:b802fc31f1db	845	/ TCP_SLOW_INTERVAL)
donatien	0:b802fc31f1db	846	#else
donatien	0:b802fc31f1db	847	if((u32_t)(tcp_ticks - pcb->tmr) >
donatien	0:b802fc31f1db	848	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
donatien	0:b802fc31f1db	849	#endif /* LWIP_TCP_KEEPALIVE */
donatien	0:b802fc31f1db	850	{
donatien	0:b802fc31f1db	851	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
donatien	0:b802fc31f1db	852	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
donatien	0:b802fc31f1db	853	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
donatien	0:b802fc31f1db	854
donatien	0:b802fc31f1db	855	++pcb_remove;
donatien	0:b802fc31f1db	856	++pcb_reset;
donatien	0:b802fc31f1db	857	}
donatien	0:b802fc31f1db	858	#if LWIP_TCP_KEEPALIVE
donatien	0:b802fc31f1db	859	else if((u32_t)(tcp_ticks - pcb->tmr) >
donatien	0:b802fc31f1db	860	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
donatien	0:b802fc31f1db	861	/ TCP_SLOW_INTERVAL)
donatien	0:b802fc31f1db	862	#else
donatien	0:b802fc31f1db	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
donatien	0:b802fc31f1db	864	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
donatien	0:b802fc31f1db	865	/ TCP_SLOW_INTERVAL)
donatien	0:b802fc31f1db	866	#endif /* LWIP_TCP_KEEPALIVE */
donatien	0:b802fc31f1db	867	{
donatien	0:b802fc31f1db	868	tcp_keepalive(pcb);
donatien	0:b802fc31f1db	869	pcb->keep_cnt_sent++;
donatien	0:b802fc31f1db	870	}
donatien	0:b802fc31f1db	871	}
donatien	0:b802fc31f1db	872
donatien	0:b802fc31f1db	873	/* If this PCB has queued out of sequence data, but has been
donatien	0:b802fc31f1db	874	inactive for too long, will drop the data (it will eventually
donatien	0:b802fc31f1db	875	be retransmitted). */
donatien	0:b802fc31f1db	876	#if TCP_QUEUE_OOSEQ
donatien	0:b802fc31f1db	877	if (pcb->ooseq != NULL &&
donatien	0:b802fc31f1db	878	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
donatien	0:b802fc31f1db	879	tcp_segs_free(pcb->ooseq);
donatien	0:b802fc31f1db	880	pcb->ooseq = NULL;
donatien	0:b802fc31f1db	881	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
donatien	0:b802fc31f1db	882	}
donatien	0:b802fc31f1db	883	#endif /* TCP_QUEUE_OOSEQ */
donatien	0:b802fc31f1db	884
donatien	0:b802fc31f1db	885	/* Check if this PCB has stayed too long in SYN-RCVD */
donatien	0:b802fc31f1db	886	if (pcb->state == SYN_RCVD) {
donatien	0:b802fc31f1db	887	if ((u32_t)(tcp_ticks - pcb->tmr) >
donatien	0:b802fc31f1db	888	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
donatien	0:b802fc31f1db	889	++pcb_remove;
donatien	0:b802fc31f1db	890	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
donatien	0:b802fc31f1db	891	}
donatien	0:b802fc31f1db	892	}
donatien	0:b802fc31f1db	893
donatien	0:b802fc31f1db	894	/* Check if this PCB has stayed too long in LAST-ACK */
donatien	0:b802fc31f1db	895	if (pcb->state == LAST_ACK) {
donatien	0:b802fc31f1db	896	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
donatien	0:b802fc31f1db	897	++pcb_remove;
donatien	0:b802fc31f1db	898	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
donatien	0:b802fc31f1db	899	}
donatien	0:b802fc31f1db	900	}
donatien	0:b802fc31f1db	901
donatien	0:b802fc31f1db	902	/* If the PCB should be removed, do it. */
donatien	0:b802fc31f1db	903	if (pcb_remove) {
donatien	0:b802fc31f1db	904	tcp_pcb_purge(pcb);
donatien	0:b802fc31f1db	905	/* Remove PCB from tcp_active_pcbs list. */
donatien	0:b802fc31f1db	906	if (prev != NULL) {
donatien	0:b802fc31f1db	907	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
donatien	0:b802fc31f1db	908	prev->next = pcb->next;
donatien	0:b802fc31f1db	909	} else {
donatien	0:b802fc31f1db	910	/* This PCB was the first. */
donatien	0:b802fc31f1db	911	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
donatien	0:b802fc31f1db	912	tcp_active_pcbs = pcb->next;
donatien	0:b802fc31f1db	913	}
donatien	0:b802fc31f1db	914
donatien	0:b802fc31f1db	915	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
donatien	0:b802fc31f1db	916	if (pcb_reset) {
donatien	0:b802fc31f1db	917	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
donatien	0:b802fc31f1db	918	pcb->local_port, pcb->remote_port);
donatien	0:b802fc31f1db	919	}
donatien	0:b802fc31f1db	920
donatien	0:b802fc31f1db	921	pcb2 = pcb->next;
donatien	0:b802fc31f1db	922	memp_free(MEMP_TCP_PCB, pcb);
donatien	0:b802fc31f1db	923	pcb = pcb2;
donatien	0:b802fc31f1db	924	} else {
donatien	0:b802fc31f1db	925	/* get the 'next' element now and work with 'prev' below (in case of abort) */
donatien	0:b802fc31f1db	926	prev = pcb;
donatien	0:b802fc31f1db	927	pcb = pcb->next;
donatien	0:b802fc31f1db	928
donatien	0:b802fc31f1db	929	/* We check if we should poll the connection. */
donatien	0:b802fc31f1db	930	++prev->polltmr;
donatien	0:b802fc31f1db	931	if (prev->polltmr >= prev->pollinterval) {
donatien	0:b802fc31f1db	932	prev->polltmr = 0;
donatien	0:b802fc31f1db	933	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
donatien	0:b802fc31f1db	934	TCP_EVENT_POLL(prev, err);
donatien	0:b802fc31f1db	935	/* if err == ERR_ABRT, 'prev' is already deallocated */
donatien	0:b802fc31f1db	936	if (err == ERR_OK) {
donatien	0:b802fc31f1db	937	tcp_output(prev);
donatien	0:b802fc31f1db	938	}
donatien	0:b802fc31f1db	939	}
donatien	0:b802fc31f1db	940	}
donatien	0:b802fc31f1db	941	}
donatien	0:b802fc31f1db	942
donatien	0:b802fc31f1db	943
donatien	0:b802fc31f1db	944	/* Steps through all of the TIME-WAIT PCBs. */
donatien	0:b802fc31f1db	945	prev = NULL;
donatien	0:b802fc31f1db	946	pcb = tcp_tw_pcbs;
donatien	0:b802fc31f1db	947	while (pcb != NULL) {
donatien	0:b802fc31f1db	948	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
donatien	0:b802fc31f1db	949	pcb_remove = 0;
donatien	0:b802fc31f1db	950
donatien	0:b802fc31f1db	951	/* Check if this PCB has stayed long enough in TIME-WAIT */
donatien	0:b802fc31f1db	952	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
donatien	0:b802fc31f1db	953	++pcb_remove;
donatien	0:b802fc31f1db	954	}
donatien	0:b802fc31f1db	955
donatien	0:b802fc31f1db	956
donatien	0:b802fc31f1db	957
donatien	0:b802fc31f1db	958	/* If the PCB should be removed, do it. */
donatien	0:b802fc31f1db	959	if (pcb_remove) {
donatien	0:b802fc31f1db	960	tcp_pcb_purge(pcb);
donatien	0:b802fc31f1db	961	/* Remove PCB from tcp_tw_pcbs list. */
donatien	0:b802fc31f1db	962	if (prev != NULL) {
donatien	0:b802fc31f1db	963	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
donatien	0:b802fc31f1db	964	prev->next = pcb->next;
donatien	0:b802fc31f1db	965	} else {
donatien	0:b802fc31f1db	966	/* This PCB was the first. */
donatien	0:b802fc31f1db	967	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
donatien	0:b802fc31f1db	968	tcp_tw_pcbs = pcb->next;
donatien	0:b802fc31f1db	969	}
donatien	0:b802fc31f1db	970	pcb2 = pcb->next;
donatien	0:b802fc31f1db	971	memp_free(MEMP_TCP_PCB, pcb);
donatien	0:b802fc31f1db	972	pcb = pcb2;
donatien	0:b802fc31f1db	973	} else {
donatien	0:b802fc31f1db	974	prev = pcb;
donatien	0:b802fc31f1db	975	pcb = pcb->next;
donatien	0:b802fc31f1db	976	}
donatien	0:b802fc31f1db	977	}
donatien	0:b802fc31f1db	978	}
donatien	0:b802fc31f1db	979
donatien	0:b802fc31f1db	980	/**
donatien	0:b802fc31f1db	981	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
donatien	0:b802fc31f1db	982	* "refused" by upper layer (application) and sends delayed ACKs.
donatien	0:b802fc31f1db	983	*
donatien	0:b802fc31f1db	984	* Automatically called from tcp_tmr().
donatien	0:b802fc31f1db	985	*/
donatien	0:b802fc31f1db	986	void
donatien	0:b802fc31f1db	987	tcp_fasttmr(void)
donatien	0:b802fc31f1db	988	{
donatien	0:b802fc31f1db	989	struct tcp_pcb *pcb = tcp_active_pcbs;
donatien	0:b802fc31f1db	990
donatien	0:b802fc31f1db	991	while(pcb != NULL) {
donatien	0:b802fc31f1db	992	struct tcp_pcb *next = pcb->next;
donatien	0:b802fc31f1db	993	/* If there is data which was previously "refused" by upper layer */
donatien	0:b802fc31f1db	994	if (pcb->refused_data != NULL) {
donatien	0:b802fc31f1db	995	/* Notify again application with data previously received. */
donatien	0:b802fc31f1db	996	err_t err;
donatien	0:b802fc31f1db	997	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
donatien	0:b802fc31f1db	998	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
donatien	0:b802fc31f1db	999	if (err == ERR_OK) {
donatien	0:b802fc31f1db	1000	pcb->refused_data = NULL;
donatien	0:b802fc31f1db	1001	} else if (err == ERR_ABRT) {
donatien	0:b802fc31f1db	1002	/* if err == ERR_ABRT, 'pcb' is already deallocated */
donatien	0:b802fc31f1db	1003	pcb = NULL;
donatien	0:b802fc31f1db	1004	}
donatien	0:b802fc31f1db	1005	}
donatien	0:b802fc31f1db	1006
donatien	0:b802fc31f1db	1007	/* send delayed ACKs */
donatien	0:b802fc31f1db	1008	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
donatien	0:b802fc31f1db	1009	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
donatien	0:b802fc31f1db	1010	tcp_ack_now(pcb);
donatien	0:b802fc31f1db	1011	tcp_output(pcb);
donatien	0:b802fc31f1db	1012	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
donatien	0:b802fc31f1db	1013	}
donatien	0:b802fc31f1db	1014
donatien	0:b802fc31f1db	1015	pcb = next;
donatien	0:b802fc31f1db	1016	}
donatien	0:b802fc31f1db	1017	}
donatien	0:b802fc31f1db	1018
donatien	0:b802fc31f1db	1019	/**
donatien	0:b802fc31f1db	1020	* Deallocates a list of TCP segments (tcp_seg structures).
donatien	0:b802fc31f1db	1021	*
donatien	0:b802fc31f1db	1022	* @param seg tcp_seg list of TCP segments to free
donatien	0:b802fc31f1db	1023	*/
donatien	0:b802fc31f1db	1024	void
donatien	0:b802fc31f1db	1025	tcp_segs_free(struct tcp_seg *seg)
donatien	0:b802fc31f1db	1026	{
donatien	0:b802fc31f1db	1027	while (seg != NULL) {
donatien	0:b802fc31f1db	1028	struct tcp_seg *next = seg->next;
donatien	0:b802fc31f1db	1029	tcp_seg_free(seg);
donatien	0:b802fc31f1db	1030	seg = next;
donatien	0:b802fc31f1db	1031	}
donatien	0:b802fc31f1db	1032	}
donatien	0:b802fc31f1db	1033
donatien	0:b802fc31f1db	1034	/**
donatien	0:b802fc31f1db	1035	* Frees a TCP segment (tcp_seg structure).
donatien	0:b802fc31f1db	1036	*
donatien	0:b802fc31f1db	1037	* @param seg single tcp_seg to free
donatien	0:b802fc31f1db	1038	*/
donatien	0:b802fc31f1db	1039	void
donatien	0:b802fc31f1db	1040	tcp_seg_free(struct tcp_seg *seg)
donatien	0:b802fc31f1db	1041	{
donatien	0:b802fc31f1db	1042	if (seg != NULL) {
donatien	0:b802fc31f1db	1043	if (seg->p != NULL) {
donatien	0:b802fc31f1db	1044	pbuf_free(seg->p);
donatien	0:b802fc31f1db	1045	#if TCP_DEBUG
donatien	0:b802fc31f1db	1046	seg->p = NULL;
donatien	0:b802fc31f1db	1047	#endif /* TCP_DEBUG */
donatien	0:b802fc31f1db	1048	}
donatien	0:b802fc31f1db	1049	memp_free(MEMP_TCP_SEG, seg);
donatien	0:b802fc31f1db	1050	}
donatien	0:b802fc31f1db	1051	}
donatien	0:b802fc31f1db	1052
donatien	0:b802fc31f1db	1053	/**
donatien	0:b802fc31f1db	1054	* Sets the priority of a connection.
donatien	0:b802fc31f1db	1055	*
donatien	0:b802fc31f1db	1056	* @param pcb the tcp_pcb to manipulate
donatien	0:b802fc31f1db	1057	* @param prio new priority
donatien	0:b802fc31f1db	1058	*/
donatien	0:b802fc31f1db	1059	void
donatien	0:b802fc31f1db	1060	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
donatien	0:b802fc31f1db	1061	{
donatien	0:b802fc31f1db	1062	pcb->prio = prio;
donatien	0:b802fc31f1db	1063	}
donatien	1:3a7c15057192	1064
donatien	0:b802fc31f1db	1065	#if TCP_QUEUE_OOSEQ
donatien	0:b802fc31f1db	1066	/**
donatien	0:b802fc31f1db	1067	* Returns a copy of the given TCP segment.
donatien	0:b802fc31f1db	1068	* The pbuf and data are not copied, only the pointers
donatien	0:b802fc31f1db	1069	*
donatien	0:b802fc31f1db	1070	* @param seg the old tcp_seg
donatien	0:b802fc31f1db	1071	* @return a copy of seg
donatien	0:b802fc31f1db	1072	*/
donatien	0:b802fc31f1db	1073	struct tcp_seg *
donatien	0:b802fc31f1db	1074	tcp_seg_copy(struct tcp_seg *seg)
donatien	0:b802fc31f1db	1075	{
donatien	0:b802fc31f1db	1076	struct tcp_seg *cseg;
donatien	0:b802fc31f1db	1077
donatien	0:b802fc31f1db	1078	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
donatien	0:b802fc31f1db	1079	if (cseg == NULL) {
donatien	0:b802fc31f1db	1080	return NULL;
donatien	0:b802fc31f1db	1081	}
donatien	0:b802fc31f1db	1082	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
donatien	0:b802fc31f1db	1083	pbuf_ref(cseg->p);
donatien	0:b802fc31f1db	1084	return cseg;
donatien	0:b802fc31f1db	1085	}
donatien	1:3a7c15057192	1086	#endif /* TCP_QUEUE_OOSEQ */
donatien	0:b802fc31f1db	1087
donatien	0:b802fc31f1db	1088	#if LWIP_CALLBACK_API
donatien	0:b802fc31f1db	1089	/**
donatien	0:b802fc31f1db	1090	* Default receive callback that is called if the user didn't register
donatien	0:b802fc31f1db	1091	* a recv callback for the pcb.
donatien	0:b802fc31f1db	1092	*/
donatien	0:b802fc31f1db	1093	err_t
donatien	0:b802fc31f1db	1094	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
donatien	0:b802fc31f1db	1095	{
donatien	0:b802fc31f1db	1096	LWIP_UNUSED_ARG(arg);
donatien	0:b802fc31f1db	1097	if (p != NULL) {
donatien	0:b802fc31f1db	1098	tcp_recved(pcb, p->tot_len);
donatien	0:b802fc31f1db	1099	pbuf_free(p);
donatien	0:b802fc31f1db	1100	} else if (err == ERR_OK) {
donatien	0:b802fc31f1db	1101	return tcp_close(pcb);
donatien	0:b802fc31f1db	1102	}
donatien	0:b802fc31f1db	1103	return ERR_OK;
donatien	0:b802fc31f1db	1104	}
donatien	0:b802fc31f1db	1105	#endif /* LWIP_CALLBACK_API */
donatien	0:b802fc31f1db	1106
donatien	0:b802fc31f1db	1107	/**
donatien	0:b802fc31f1db	1108	* Kills the oldest active connection that has lower priority than prio.
donatien	0:b802fc31f1db	1109	*
donatien	0:b802fc31f1db	1110	* @param prio minimum priority
donatien	0:b802fc31f1db	1111	*/
donatien	0:b802fc31f1db	1112	static void
donatien	0:b802fc31f1db	1113	tcp_kill_prio(u8_t prio)
donatien	0:b802fc31f1db	1114	{
donatien	0:b802fc31f1db	1115	struct tcp_pcb pcb, inactive;
donatien	0:b802fc31f1db	1116	u32_t inactivity;
donatien	0:b802fc31f1db	1117	u8_t mprio;
donatien	0:b802fc31f1db	1118
donatien	0:b802fc31f1db	1119
donatien	0:b802fc31f1db	1120	mprio = TCP_PRIO_MAX;
donatien	0:b802fc31f1db	1121
donatien	0:b802fc31f1db	1122	/* We kill the oldest active connection that has lower priority than prio. */
donatien	0:b802fc31f1db	1123	inactivity = 0;
donatien	0:b802fc31f1db	1124	inactive = NULL;
donatien	0:b802fc31f1db	1125	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
donatien	0:b802fc31f1db	1126	if (pcb->prio <= prio &&
donatien	0:b802fc31f1db	1127	pcb->prio <= mprio &&
donatien	0:b802fc31f1db	1128	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
donatien	0:b802fc31f1db	1129	inactivity = tcp_ticks - pcb->tmr;
donatien	0:b802fc31f1db	1130	inactive = pcb;
donatien	0:b802fc31f1db	1131	mprio = pcb->prio;
donatien	0:b802fc31f1db	1132	}
donatien	0:b802fc31f1db	1133	}
donatien	0:b802fc31f1db	1134	if (inactive != NULL) {
donatien	0:b802fc31f1db	1135	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
donatien	0:b802fc31f1db	1136	(void *)inactive, inactivity));
donatien	0:b802fc31f1db	1137	tcp_abort(inactive);
donatien	1:3a7c15057192	1138	}
donatien	0:b802fc31f1db	1139	}
donatien	0:b802fc31f1db	1140
donatien	0:b802fc31f1db	1141	/**
donatien	0:b802fc31f1db	1142	* Kills the oldest connection that is in TIME_WAIT state.
donatien	0:b802fc31f1db	1143	* Called from tcp_alloc() if no more connections are available.
donatien	0:b802fc31f1db	1144	*/
donatien	0:b802fc31f1db	1145	static void
donatien	0:b802fc31f1db	1146	tcp_kill_timewait(void)
donatien	0:b802fc31f1db	1147	{
donatien	0:b802fc31f1db	1148	struct tcp_pcb pcb, inactive;
donatien	0:b802fc31f1db	1149	u32_t inactivity;
donatien	0:b802fc31f1db	1150
donatien	0:b802fc31f1db	1151	inactivity = 0;
donatien	0:b802fc31f1db	1152	inactive = NULL;
donatien	0:b802fc31f1db	1153	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
donatien	0:b802fc31f1db	1154	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
donatien	0:b802fc31f1db	1155	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
donatien	0:b802fc31f1db	1156	inactivity = tcp_ticks - pcb->tmr;
donatien	0:b802fc31f1db	1157	inactive = pcb;
donatien	0:b802fc31f1db	1158	}
donatien	0:b802fc31f1db	1159	}
donatien	0:b802fc31f1db	1160	if (inactive != NULL) {
donatien	0:b802fc31f1db	1161	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
donatien	0:b802fc31f1db	1162	(void *)inactive, inactivity));
donatien	0:b802fc31f1db	1163	tcp_abort(inactive);
donatien	1:3a7c15057192	1164	}
donatien	0:b802fc31f1db	1165	}
donatien	0:b802fc31f1db	1166
donatien	0:b802fc31f1db	1167	/**
donatien	0:b802fc31f1db	1168	* Allocate a new tcp_pcb structure.
donatien	0:b802fc31f1db	1169	*
donatien	0:b802fc31f1db	1170	* @param prio priority for the new pcb
donatien	0:b802fc31f1db	1171	* @return a new tcp_pcb that initially is in state CLOSED
donatien	0:b802fc31f1db	1172	*/
donatien	0:b802fc31f1db	1173	struct tcp_pcb *
donatien	0:b802fc31f1db	1174	tcp_alloc(u8_t prio)
donatien	0:b802fc31f1db	1175	{
donatien	0:b802fc31f1db	1176	struct tcp_pcb *pcb;
donatien	0:b802fc31f1db	1177	u32_t iss;
donatien	0:b802fc31f1db	1178
donatien	0:b802fc31f1db	1179	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
donatien	0:b802fc31f1db	1180	if (pcb == NULL) {
donatien	0:b802fc31f1db	1181	/* Try killing oldest connection in TIME-WAIT. */
donatien	0:b802fc31f1db	1182	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
donatien	0:b802fc31f1db	1183	tcp_kill_timewait();
donatien	0:b802fc31f1db	1184	/* Try to allocate a tcp_pcb again. */
donatien	0:b802fc31f1db	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
donatien	0:b802fc31f1db	1186	if (pcb == NULL) {
donatien	0:b802fc31f1db	1187	/* Try killing active connections with lower priority than the new one. */
donatien	0:b802fc31f1db	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
donatien	0:b802fc31f1db	1189	tcp_kill_prio(prio);
donatien	0:b802fc31f1db	1190	/* Try to allocate a tcp_pcb again. */
donatien	0:b802fc31f1db	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
donatien	0:b802fc31f1db	1192	if (pcb != NULL) {
donatien	0:b802fc31f1db	1193	/* adjust err stats: memp_malloc failed twice before */
donatien	0:b802fc31f1db	1194	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
donatien	0:b802fc31f1db	1195	}
donatien	0:b802fc31f1db	1196	}
donatien	0:b802fc31f1db	1197	if (pcb != NULL) {
donatien	0:b802fc31f1db	1198	/* adjust err stats: timewait PCB was freed above */
donatien	0:b802fc31f1db	1199	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
donatien	0:b802fc31f1db	1200	}
donatien	0:b802fc31f1db	1201	}
donatien	0:b802fc31f1db	1202	if (pcb != NULL) {
donatien	0:b802fc31f1db	1203	memset(pcb, 0, sizeof(struct tcp_pcb));
donatien	0:b802fc31f1db	1204	pcb->prio = prio;
donatien	0:b802fc31f1db	1205	pcb->snd_buf = TCP_SND_BUF;
donatien	0:b802fc31f1db	1206	pcb->snd_queuelen = 0;
donatien	0:b802fc31f1db	1207	pcb->rcv_wnd = TCP_WND;
donatien	0:b802fc31f1db	1208	pcb->rcv_ann_wnd = TCP_WND;
donatien	0:b802fc31f1db	1209	pcb->tos = 0;
donatien	0:b802fc31f1db	1210	pcb->ttl = TCP_TTL;
donatien	0:b802fc31f1db	1211	/* As initial send MSS, we use TCP_MSS but limit it to 536.
donatien	0:b802fc31f1db	1212	The send MSS is updated when an MSS option is received. */
donatien	0:b802fc31f1db	1213	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
donatien	0:b802fc31f1db	1214	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
donatien	0:b802fc31f1db	1215	pcb->sa = 0;
donatien	0:b802fc31f1db	1216	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
donatien	0:b802fc31f1db	1217	pcb->rtime = -1;
donatien	0:b802fc31f1db	1218	pcb->cwnd = 1;
donatien	0:b802fc31f1db	1219	iss = tcp_next_iss();
donatien	0:b802fc31f1db	1220	pcb->snd_wl2 = iss;
donatien	0:b802fc31f1db	1221	pcb->snd_nxt = iss;
donatien	0:b802fc31f1db	1222	pcb->lastack = iss;
donatien	0:b802fc31f1db	1223	pcb->snd_lbb = iss;
donatien	0:b802fc31f1db	1224	pcb->tmr = tcp_ticks;
donatien	1:3a7c15057192	1225
donatien	1:3a7c15057192	1226	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
donatien	0:b802fc31f1db	1227
donatien	0:b802fc31f1db	1228	pcb->polltmr = 0;
donatien	0:b802fc31f1db	1229
donatien	0:b802fc31f1db	1230	#if LWIP_CALLBACK_API
donatien	0:b802fc31f1db	1231	pcb->recv = tcp_recv_null;
donatien	0:b802fc31f1db	1232	#endif /* LWIP_CALLBACK_API */
donatien	0:b802fc31f1db	1233
donatien	0:b802fc31f1db	1234	/* Init KEEPALIVE timer */
donatien	0:b802fc31f1db	1235	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
donatien	0:b802fc31f1db	1236
donatien	0:b802fc31f1db	1237	#if LWIP_TCP_KEEPALIVE
donatien	0:b802fc31f1db	1238	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
donatien	0:b802fc31f1db	1239	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
donatien	0:b802fc31f1db	1240	#endif /* LWIP_TCP_KEEPALIVE */
donatien	0:b802fc31f1db	1241
donatien	0:b802fc31f1db	1242	pcb->keep_cnt_sent = 0;
donatien	0:b802fc31f1db	1243	}
donatien	0:b802fc31f1db	1244	return pcb;
donatien	0:b802fc31f1db	1245	}
donatien	0:b802fc31f1db	1246
donatien	0:b802fc31f1db	1247	/**
donatien	0:b802fc31f1db	1248	* Creates a new TCP protocol control block but doesn't place it on
donatien	0:b802fc31f1db	1249	* any of the TCP PCB lists.
donatien	0:b802fc31f1db	1250	* The pcb is not put on any list until binding using tcp_bind().
donatien	0:b802fc31f1db	1251	*
donatien	0:b802fc31f1db	1252	* @internal: Maybe there should be a idle TCP PCB list where these
donatien	0:b802fc31f1db	1253	* PCBs are put on. Port reservation using tcp_bind() is implemented but
donatien	0:b802fc31f1db	1254	* allocated pcbs that are not bound can't be killed automatically if wanting
donatien	0:b802fc31f1db	1255	* to allocate a pcb with higher prio (@see tcp_kill_prio())
donatien	0:b802fc31f1db	1256	*
donatien	0:b802fc31f1db	1257	* @return a new tcp_pcb that initially is in state CLOSED
donatien	0:b802fc31f1db	1258	*/
donatien	0:b802fc31f1db	1259	struct tcp_pcb *
donatien	0:b802fc31f1db	1260	tcp_new(void)
donatien	0:b802fc31f1db	1261	{
donatien	0:b802fc31f1db	1262	return tcp_alloc(TCP_PRIO_NORMAL);
donatien	0:b802fc31f1db	1263	}
donatien	0:b802fc31f1db	1264
donatien	0:b802fc31f1db	1265	/**
donatien	0:b802fc31f1db	1266	* Used to specify the argument that should be passed callback
donatien	0:b802fc31f1db	1267	* functions.
donatien	0:b802fc31f1db	1268	*
donatien	0:b802fc31f1db	1269	* @param pcb tcp_pcb to set the callback argument
donatien	0:b802fc31f1db	1270	* @param arg void pointer argument to pass to callback functions
donatien	0:b802fc31f1db	1271	*/
donatien	0:b802fc31f1db	1272	void
donatien	0:b802fc31f1db	1273	tcp_arg(struct tcp_pcb pcb, void arg)
donatien	0:b802fc31f1db	1274	{
donatien	0:b802fc31f1db	1275	pcb->callback_arg = arg;
donatien	0:b802fc31f1db	1276	}
donatien	0:b802fc31f1db	1277	#if LWIP_CALLBACK_API
donatien	0:b802fc31f1db	1278
donatien	0:b802fc31f1db	1279	/**
donatien	0:b802fc31f1db	1280	* Used to specify the function that should be called when a TCP
donatien	0:b802fc31f1db	1281	* connection receives data.
donatien	0:b802fc31f1db	1282	*
donatien	0:b802fc31f1db	1283	* @param pcb tcp_pcb to set the recv callback
donatien	0:b802fc31f1db	1284	* @param recv callback function to call for this pcb when data is received
donatien	0:b802fc31f1db	1285	*/
donatien	0:b802fc31f1db	1286	void
donatien	0:b802fc31f1db	1287	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
donatien	0:b802fc31f1db	1288	{
donatien	0:b802fc31f1db	1289	pcb->recv = recv;
donatien	0:b802fc31f1db	1290	}
donatien	0:b802fc31f1db	1291
donatien	0:b802fc31f1db	1292	/**
donatien	0:b802fc31f1db	1293	* Used to specify the function that should be called when TCP data
donatien	0:b802fc31f1db	1294	* has been successfully delivered to the remote host.
donatien	0:b802fc31f1db	1295	*
donatien	0:b802fc31f1db	1296	* @param pcb tcp_pcb to set the sent callback
donatien	0:b802fc31f1db	1297	* @param sent callback function to call for this pcb when data is successfully sent
donatien	0:b802fc31f1db	1298	*/
donatien	0:b802fc31f1db	1299	void
donatien	0:b802fc31f1db	1300	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
donatien	0:b802fc31f1db	1301	{
donatien	0:b802fc31f1db	1302	pcb->sent = sent;
donatien	0:b802fc31f1db	1303	}
donatien	0:b802fc31f1db	1304
donatien	0:b802fc31f1db	1305	/**
donatien	0:b802fc31f1db	1306	* Used to specify the function that should be called when a fatal error
donatien	0:b802fc31f1db	1307	* has occured on the connection.
donatien	0:b802fc31f1db	1308	*
donatien	0:b802fc31f1db	1309	* @param pcb tcp_pcb to set the err callback
donatien	0:b802fc31f1db	1310	* @param err callback function to call for this pcb when a fatal error
donatien	0:b802fc31f1db	1311	* has occured on the connection
donatien	0:b802fc31f1db	1312	*/
donatien	0:b802fc31f1db	1313	void
donatien	0:b802fc31f1db	1314	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
donatien	0:b802fc31f1db	1315	{
donatien	0:b802fc31f1db	1316	pcb->errf = err;
donatien	0:b802fc31f1db	1317	}
donatien	0:b802fc31f1db	1318
donatien	0:b802fc31f1db	1319	/**
donatien	0:b802fc31f1db	1320	* Used for specifying the function that should be called when a
donatien	0:b802fc31f1db	1321	* LISTENing connection has been connected to another host.
donatien	0:b802fc31f1db	1322	*
donatien	0:b802fc31f1db	1323	* @param pcb tcp_pcb to set the accept callback
donatien	0:b802fc31f1db	1324	* @param accept callback function to call for this pcb when LISTENing
donatien	0:b802fc31f1db	1325	* connection has been connected to another host
donatien	0:b802fc31f1db	1326	*/
donatien	0:b802fc31f1db	1327	void
donatien	0:b802fc31f1db	1328	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
donatien	0:b802fc31f1db	1329	{
donatien	0:b802fc31f1db	1330	pcb->accept = accept;
donatien	0:b802fc31f1db	1331	}
donatien	0:b802fc31f1db	1332	#endif /* LWIP_CALLBACK_API */
donatien	0:b802fc31f1db	1333
donatien	0:b802fc31f1db	1334
donatien	0:b802fc31f1db	1335	/**
donatien	0:b802fc31f1db	1336	* Used to specify the function that should be called periodically
donatien	0:b802fc31f1db	1337	* from TCP. The interval is specified in terms of the TCP coarse
donatien	0:b802fc31f1db	1338	* timer interval, which is called twice a second.
donatien	0:b802fc31f1db	1339	*
donatien	0:b802fc31f1db	1340	*/
donatien	0:b802fc31f1db	1341	void
donatien	0:b802fc31f1db	1342	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
donatien	0:b802fc31f1db	1343	{
donatien	0:b802fc31f1db	1344	#if LWIP_CALLBACK_API
donatien	0:b802fc31f1db	1345	pcb->poll = poll;
donatien	1:3a7c15057192	1346	#else /* LWIP_CALLBACK_API */
donatien	1:3a7c15057192	1347	LWIP_UNUSED_ARG(poll);
donatien	0:b802fc31f1db	1348	#endif /* LWIP_CALLBACK_API */
donatien	0:b802fc31f1db	1349	pcb->pollinterval = interval;
donatien	0:b802fc31f1db	1350	}
donatien	0:b802fc31f1db	1351
donatien	0:b802fc31f1db	1352	/**
donatien	0:b802fc31f1db	1353	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
donatien	0:b802fc31f1db	1354	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
donatien	0:b802fc31f1db	1355	*
donatien	0:b802fc31f1db	1356	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
donatien	0:b802fc31f1db	1357	*/
donatien	0:b802fc31f1db	1358	void
donatien	0:b802fc31f1db	1359	tcp_pcb_purge(struct tcp_pcb *pcb)
donatien	0:b802fc31f1db	1360	{
donatien	0:b802fc31f1db	1361	if (pcb->state != CLOSED &&
donatien	0:b802fc31f1db	1362	pcb->state != TIME_WAIT &&
donatien	0:b802fc31f1db	1363	pcb->state != LISTEN) {
donatien	0:b802fc31f1db	1364
donatien	0:b802fc31f1db	1365	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
donatien	0:b802fc31f1db	1366
donatien	0:b802fc31f1db	1367	#if TCP_LISTEN_BACKLOG
donatien	0:b802fc31f1db	1368	if (pcb->state == SYN_RCVD) {
donatien	0:b802fc31f1db	1369	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
donatien	0:b802fc31f1db	1370	struct tcp_pcb_listen *lpcb;
donatien	0:b802fc31f1db	1371	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
donatien	0:b802fc31f1db	1372	tcp_listen_pcbs.listen_pcbs != NULL);
donatien	0:b802fc31f1db	1373	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
donatien	0:b802fc31f1db	1374	if ((lpcb->local_port == pcb->local_port) &&
donatien	0:b802fc31f1db	1375	(ip_addr_isany(&lpcb->local_ip) \|\|
donatien	0:b802fc31f1db	1376	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
donatien	0:b802fc31f1db	1377	/* port and address of the listen pcb match the timed-out pcb */
donatien	0:b802fc31f1db	1378	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
donatien	0:b802fc31f1db	1379	lpcb->accepts_pending > 0);
donatien	0:b802fc31f1db	1380	lpcb->accepts_pending--;
donatien	0:b802fc31f1db	1381	break;
donatien	0:b802fc31f1db	1382	}
donatien	0:b802fc31f1db	1383	}
donatien	0:b802fc31f1db	1384	}
donatien	0:b802fc31f1db	1385	#endif /* TCP_LISTEN_BACKLOG */
donatien	0:b802fc31f1db	1386
donatien	0:b802fc31f1db	1387
donatien	0:b802fc31f1db	1388	if (pcb->refused_data != NULL) {
donatien	0:b802fc31f1db	1389	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
donatien	0:b802fc31f1db	1390	pbuf_free(pcb->refused_data);
donatien	0:b802fc31f1db	1391	pcb->refused_data = NULL;
donatien	0:b802fc31f1db	1392	}
donatien	0:b802fc31f1db	1393	if (pcb->unsent != NULL) {
donatien	0:b802fc31f1db	1394	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
donatien	0:b802fc31f1db	1395	}
donatien	0:b802fc31f1db	1396	if (pcb->unacked != NULL) {
donatien	0:b802fc31f1db	1397	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
donatien	0:b802fc31f1db	1398	}
donatien	1:3a7c15057192	1399	#if TCP_QUEUE_OOSEQ
donatien	0:b802fc31f1db	1400	if (pcb->ooseq != NULL) {
donatien	0:b802fc31f1db	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
donatien	0:b802fc31f1db	1402	}
donatien	0:b802fc31f1db	1403	tcp_segs_free(pcb->ooseq);
donatien	0:b802fc31f1db	1404	pcb->ooseq = NULL;
donatien	0:b802fc31f1db	1405	#endif /* TCP_QUEUE_OOSEQ */
donatien	0:b802fc31f1db	1406
donatien	0:b802fc31f1db	1407	/* Stop the retransmission timer as it will expect data on unacked
donatien	0:b802fc31f1db	1408	queue if it fires */
donatien	0:b802fc31f1db	1409	pcb->rtime = -1;
donatien	0:b802fc31f1db	1410
donatien	0:b802fc31f1db	1411	tcp_segs_free(pcb->unsent);
donatien	0:b802fc31f1db	1412	tcp_segs_free(pcb->unacked);
donatien	0:b802fc31f1db	1413	pcb->unacked = pcb->unsent = NULL;
donatien	0:b802fc31f1db	1414	#if TCP_OVERSIZE
donatien	0:b802fc31f1db	1415	pcb->unsent_oversize = 0;
donatien	0:b802fc31f1db	1416	#endif /* TCP_OVERSIZE */
donatien	0:b802fc31f1db	1417	}
donatien	0:b802fc31f1db	1418	}
donatien	0:b802fc31f1db	1419
donatien	0:b802fc31f1db	1420	/**
donatien	0:b802fc31f1db	1421	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
donatien	0:b802fc31f1db	1422	*
donatien	0:b802fc31f1db	1423	* @param pcblist PCB list to purge.
donatien	0:b802fc31f1db	1424	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
donatien	0:b802fc31f1db	1425	*/
donatien	0:b802fc31f1db	1426	void
donatien	0:b802fc31f1db	1427	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
donatien	0:b802fc31f1db	1428	{
donatien	0:b802fc31f1db	1429	TCP_RMV(pcblist, pcb);
donatien	0:b802fc31f1db	1430
donatien	0:b802fc31f1db	1431	tcp_pcb_purge(pcb);
donatien	0:b802fc31f1db	1432
donatien	0:b802fc31f1db	1433	/* if there is an outstanding delayed ACKs, send it */
donatien	0:b802fc31f1db	1434	if (pcb->state != TIME_WAIT &&
donatien	0:b802fc31f1db	1435	pcb->state != LISTEN &&
donatien	0:b802fc31f1db	1436	pcb->flags & TF_ACK_DELAY) {
donatien	0:b802fc31f1db	1437	pcb->flags \|= TF_ACK_NOW;
donatien	0:b802fc31f1db	1438	tcp_output(pcb);
donatien	0:b802fc31f1db	1439	}
donatien	0:b802fc31f1db	1440
donatien	0:b802fc31f1db	1441	if (pcb->state != LISTEN) {
donatien	0:b802fc31f1db	1442	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
donatien	0:b802fc31f1db	1443	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
donatien	0:b802fc31f1db	1444	#if TCP_QUEUE_OOSEQ
donatien	0:b802fc31f1db	1445	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
donatien	0:b802fc31f1db	1446	#endif /* TCP_QUEUE_OOSEQ */
donatien	0:b802fc31f1db	1447	}
donatien	0:b802fc31f1db	1448
donatien	0:b802fc31f1db	1449	pcb->state = CLOSED;
donatien	0:b802fc31f1db	1450
donatien	0:b802fc31f1db	1451	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
donatien	0:b802fc31f1db	1452	}
donatien	0:b802fc31f1db	1453
donatien	0:b802fc31f1db	1454	/**
donatien	0:b802fc31f1db	1455	* Calculates a new initial sequence number for new connections.
donatien	0:b802fc31f1db	1456	*
donatien	0:b802fc31f1db	1457	* @return u32_t pseudo random sequence number
donatien	0:b802fc31f1db	1458	*/
donatien	0:b802fc31f1db	1459	u32_t
donatien	0:b802fc31f1db	1460	tcp_next_iss(void)
donatien	0:b802fc31f1db	1461	{
donatien	0:b802fc31f1db	1462	static u32_t iss = 6510;
donatien	0:b802fc31f1db	1463
donatien	0:b802fc31f1db	1464	iss += tcp_ticks; /* XXX */
donatien	0:b802fc31f1db	1465	return iss;
donatien	0:b802fc31f1db	1466	}
donatien	0:b802fc31f1db	1467
donatien	0:b802fc31f1db	1468	#if TCP_CALCULATE_EFF_SEND_MSS
donatien	0:b802fc31f1db	1469	/**
donatien	0:b802fc31f1db	1470	* Calcluates the effective send mss that can be used for a specific IP address
donatien	0:b802fc31f1db	1471	* by using ip_route to determin the netif used to send to the address and
donatien	0:b802fc31f1db	1472	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
donatien	0:b802fc31f1db	1473	*/
donatien	0:b802fc31f1db	1474	u16_t
donatien	0:b802fc31f1db	1475	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
donatien	0:b802fc31f1db	1476	{
donatien	0:b802fc31f1db	1477	u16_t mss_s;
donatien	0:b802fc31f1db	1478	struct netif *outif;
donatien	0:b802fc31f1db	1479
donatien	0:b802fc31f1db	1480	outif = ip_route(addr);
donatien	0:b802fc31f1db	1481	if ((outif != NULL) && (outif->mtu != 0)) {
donatien	0:b802fc31f1db	1482	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
donatien	0:b802fc31f1db	1483	/* RFC 1122, chap 4.2.2.6:
donatien	0:b802fc31f1db	1484	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
donatien	0:b802fc31f1db	1485	* We correct for TCP options in tcp_write(), and don't support IP options.
donatien	0:b802fc31f1db	1486	*/
donatien	0:b802fc31f1db	1487	sendmss = LWIP_MIN(sendmss, mss_s);
donatien	0:b802fc31f1db	1488	}
donatien	0:b802fc31f1db	1489	return sendmss;
donatien	0:b802fc31f1db	1490	}
donatien	0:b802fc31f1db	1491	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
donatien	0:b802fc31f1db	1492
donatien	0:b802fc31f1db	1493	const char*
donatien	0:b802fc31f1db	1494	tcp_debug_state_str(enum tcp_state s)
donatien	0:b802fc31f1db	1495	{
donatien	0:b802fc31f1db	1496	return tcp_state_str[s];
donatien	0:b802fc31f1db	1497	}
donatien	0:b802fc31f1db	1498
donatien	0:b802fc31f1db	1499	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
donatien	0:b802fc31f1db	1500	/**
donatien	0:b802fc31f1db	1501	* Print a tcp header for debugging purposes.
donatien	0:b802fc31f1db	1502	*
donatien	0:b802fc31f1db	1503	* @param tcphdr pointer to a struct tcp_hdr
donatien	0:b802fc31f1db	1504	*/
donatien	0:b802fc31f1db	1505	void
donatien	0:b802fc31f1db	1506	tcp_debug_print(struct tcp_hdr *tcphdr)
donatien	0:b802fc31f1db	1507	{
donatien	0:b802fc31f1db	1508	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
donatien	0:b802fc31f1db	1509	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
donatien	0:b802fc31f1db	1510	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
donatien	0:b802fc31f1db	1511	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
donatien	0:b802fc31f1db	1512	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
donatien	0:b802fc31f1db	1513	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
donatien	0:b802fc31f1db	1514	ntohl(tcphdr->seqno)));
donatien	0:b802fc31f1db	1515	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
donatien	0:b802fc31f1db	1516	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
donatien	0:b802fc31f1db	1517	ntohl(tcphdr->ackno)));
donatien	0:b802fc31f1db	1518	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
donatien	0:b802fc31f1db	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 (",
donatien	0:b802fc31f1db	1520	TCPH_HDRLEN(tcphdr),
donatien	0:b802fc31f1db	1521	TCPH_FLAGS(tcphdr) >> 5 & 1,
donatien	0:b802fc31f1db	1522	TCPH_FLAGS(tcphdr) >> 4 & 1,
donatien	0:b802fc31f1db	1523	TCPH_FLAGS(tcphdr) >> 3 & 1,
donatien	0:b802fc31f1db	1524	TCPH_FLAGS(tcphdr) >> 2 & 1,
donatien	0:b802fc31f1db	1525	TCPH_FLAGS(tcphdr) >> 1 & 1,
donatien	0:b802fc31f1db	1526	TCPH_FLAGS(tcphdr) & 1,
donatien	0:b802fc31f1db	1527	ntohs(tcphdr->wnd)));
donatien	0:b802fc31f1db	1528	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
donatien	0:b802fc31f1db	1529	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
donatien	0:b802fc31f1db	1530	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
donatien	0:b802fc31f1db	1531	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
donatien	0:b802fc31f1db	1532	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
donatien	0:b802fc31f1db	1533	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
donatien	0:b802fc31f1db	1534	}
donatien	0:b802fc31f1db	1535
donatien	0:b802fc31f1db	1536	/**
donatien	0:b802fc31f1db	1537	* Print a tcp state for debugging purposes.
donatien	0:b802fc31f1db	1538	*
donatien	0:b802fc31f1db	1539	* @param s enum tcp_state to print
donatien	0:b802fc31f1db	1540	*/
donatien	0:b802fc31f1db	1541	void
donatien	0:b802fc31f1db	1542	tcp_debug_print_state(enum tcp_state s)
donatien	0:b802fc31f1db	1543	{
donatien	0:b802fc31f1db	1544	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
donatien	0:b802fc31f1db	1545	}
donatien	0:b802fc31f1db	1546
donatien	0:b802fc31f1db	1547	/**
donatien	0:b802fc31f1db	1548	* Print tcp flags for debugging purposes.
donatien	0:b802fc31f1db	1549	*
donatien	0:b802fc31f1db	1550	* @param flags tcp flags, all active flags are printed
donatien	0:b802fc31f1db	1551	*/
donatien	0:b802fc31f1db	1552	void
donatien	0:b802fc31f1db	1553	tcp_debug_print_flags(u8_t flags)
donatien	0:b802fc31f1db	1554	{
donatien	0:b802fc31f1db	1555	if (flags & TCP_FIN) {
donatien	0:b802fc31f1db	1556	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
donatien	0:b802fc31f1db	1557	}
donatien	0:b802fc31f1db	1558	if (flags & TCP_SYN) {
donatien	0:b802fc31f1db	1559	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
donatien	0:b802fc31f1db	1560	}
donatien	0:b802fc31f1db	1561	if (flags & TCP_RST) {
donatien	0:b802fc31f1db	1562	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
donatien	0:b802fc31f1db	1563	}
donatien	0:b802fc31f1db	1564	if (flags & TCP_PSH) {
donatien	0:b802fc31f1db	1565	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
donatien	0:b802fc31f1db	1566	}
donatien	0:b802fc31f1db	1567	if (flags & TCP_ACK) {
donatien	0:b802fc31f1db	1568	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
donatien	0:b802fc31f1db	1569	}
donatien	0:b802fc31f1db	1570	if (flags & TCP_URG) {
donatien	0:b802fc31f1db	1571	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
donatien	0:b802fc31f1db	1572	}
donatien	0:b802fc31f1db	1573	if (flags & TCP_ECE) {
donatien	0:b802fc31f1db	1574	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
donatien	0:b802fc31f1db	1575	}
donatien	0:b802fc31f1db	1576	if (flags & TCP_CWR) {
donatien	0:b802fc31f1db	1577	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
donatien	0:b802fc31f1db	1578	}
donatien	0:b802fc31f1db	1579	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
donatien	0:b802fc31f1db	1580	}
donatien	0:b802fc31f1db	1581
donatien	0:b802fc31f1db	1582	/**
donatien	0:b802fc31f1db	1583	* Print all tcp_pcbs in every list for debugging purposes.
donatien	0:b802fc31f1db	1584	*/
donatien	0:b802fc31f1db	1585	void
donatien	0:b802fc31f1db	1586	tcp_debug_print_pcbs(void)
donatien	0:b802fc31f1db	1587	{
donatien	0:b802fc31f1db	1588	struct tcp_pcb *pcb;
donatien	0:b802fc31f1db	1589	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
donatien	0:b802fc31f1db	1590	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
donatien	0:b802fc31f1db	1591	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
donatien	0:b802fc31f1db	1592	pcb->local_port, pcb->remote_port,
donatien	0:b802fc31f1db	1593	pcb->snd_nxt, pcb->rcv_nxt));
donatien	0:b802fc31f1db	1594	tcp_debug_print_state(pcb->state);
donatien	0:b802fc31f1db	1595	}
donatien	0:b802fc31f1db	1596	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
donatien	0:b802fc31f1db	1597	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
donatien	0:b802fc31f1db	1598	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
donatien	0:b802fc31f1db	1599	pcb->local_port, pcb->remote_port,
donatien	0:b802fc31f1db	1600	pcb->snd_nxt, pcb->rcv_nxt));
donatien	0:b802fc31f1db	1601	tcp_debug_print_state(pcb->state);
donatien	0:b802fc31f1db	1602	}
donatien	0:b802fc31f1db	1603	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
donatien	0:b802fc31f1db	1604	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
donatien	0:b802fc31f1db	1605	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
donatien	0:b802fc31f1db	1606	pcb->local_port, pcb->remote_port,
donatien	0:b802fc31f1db	1607	pcb->snd_nxt, pcb->rcv_nxt));
donatien	0:b802fc31f1db	1608	tcp_debug_print_state(pcb->state);
donatien	0:b802fc31f1db	1609	}
donatien	0:b802fc31f1db	1610	}
donatien	0:b802fc31f1db	1611
donatien	0:b802fc31f1db	1612	/**
donatien	0:b802fc31f1db	1613	* Check state consistency of the tcp_pcb lists.
donatien	0:b802fc31f1db	1614	*/
donatien	0:b802fc31f1db	1615	s16_t
donatien	0:b802fc31f1db	1616	tcp_pcbs_sane(void)
donatien	0:b802fc31f1db	1617	{
donatien	0:b802fc31f1db	1618	struct tcp_pcb *pcb;
donatien	0:b802fc31f1db	1619	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
donatien	0:b802fc31f1db	1620	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
donatien	0:b802fc31f1db	1621	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
donatien	0:b802fc31f1db	1622	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
donatien	0:b802fc31f1db	1623	}
donatien	0:b802fc31f1db	1624	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
donatien	0:b802fc31f1db	1625	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
donatien	0:b802fc31f1db	1626	}
donatien	0:b802fc31f1db	1627	return 1;
donatien	0:b802fc31f1db	1628	}
donatien	0:b802fc31f1db	1629	#endif /* TCP_DEBUG */
donatien	0:b802fc31f1db	1630
donatien	0:b802fc31f1db	1631	#endif /* LWIP_TCP */

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Type:	Program
Created:	09 Jul 2010
Imports:	20
Forks:	0
Commits:	5
Dependents:	0
Dependencies:	0
Followers:	3

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lwip/core/tcp.c@4:e00281c7453d, 2010-08-06 (annotated)

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