RMFWeb - Small Testprogram to have WebAccess via Webserver…

Users » ED7418 » Code » RMFWeb

Small Testprogram to have WebAccess via Webserver to a 433Mhz tranmitter to control remotly some devices from remote, with TFTP, NTP and RMF. This could be a base to develop applications.

Dependencies: ChaNFSSD TFTPServer RMFWeb

Dependents: RMFWeb

NetServices/lwip/core/tcp.c@1:809b59c7a800, 2014-06-16 (annotated)

Committer:: ED7418
Date:: Mon Jun 16 07:40:08 2014 +0000
Revision:: 1:809b59c7a800
Parent:: 0:51f1ef89ec7b

mbed-lib and other libs are a based on a project, published in a Elektor-book "ARM-microkontroller Part II".

Who changed what in which revision?

User	Revision	Line number	New contents of line
ED7418	0:51f1ef89ec7b	1	/**
ED7418	0:51f1ef89ec7b	2	* @file
ED7418	0:51f1ef89ec7b	3	* Transmission Control Protocol for IP
ED7418	0:51f1ef89ec7b	4	*
ED7418	0:51f1ef89ec7b	5	* This file contains common functions for the TCP implementation, such as functinos
ED7418	0:51f1ef89ec7b	6	* for manipulating the data structures and the TCP timer functions. TCP functions
ED7418	0:51f1ef89ec7b	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
ED7418	0:51f1ef89ec7b	8	*
ED7418	0:51f1ef89ec7b	9	*/
ED7418	0:51f1ef89ec7b	10
ED7418	0:51f1ef89ec7b	11	/*
ED7418	0:51f1ef89ec7b	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
ED7418	0:51f1ef89ec7b	13	* All rights reserved.
ED7418	0:51f1ef89ec7b	14	*
ED7418	0:51f1ef89ec7b	15	* Redistribution and use in source and binary forms, with or without modification,
ED7418	0:51f1ef89ec7b	16	* are permitted provided that the following conditions are met:
ED7418	0:51f1ef89ec7b	17	*
ED7418	0:51f1ef89ec7b	18	* 1. Redistributions of source code must retain the above copyright notice,
ED7418	0:51f1ef89ec7b	19	* this list of conditions and the following disclaimer.
ED7418	0:51f1ef89ec7b	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
ED7418	0:51f1ef89ec7b	21	* this list of conditions and the following disclaimer in the documentation
ED7418	0:51f1ef89ec7b	22	* and/or other materials provided with the distribution.
ED7418	0:51f1ef89ec7b	23	* 3. The name of the author may not be used to endorse or promote products
ED7418	0:51f1ef89ec7b	24	* derived from this software without specific prior written permission.
ED7418	0:51f1ef89ec7b	25	*
ED7418	0:51f1ef89ec7b	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
ED7418	0:51f1ef89ec7b	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
ED7418	0:51f1ef89ec7b	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
ED7418	0:51f1ef89ec7b	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
ED7418	0:51f1ef89ec7b	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
ED7418	0:51f1ef89ec7b	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
ED7418	0:51f1ef89ec7b	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
ED7418	0:51f1ef89ec7b	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
ED7418	0:51f1ef89ec7b	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
ED7418	0:51f1ef89ec7b	35	* OF SUCH DAMAGE.
ED7418	0:51f1ef89ec7b	36	*
ED7418	0:51f1ef89ec7b	37	* This file is part of the lwIP TCP/IP stack.
ED7418	0:51f1ef89ec7b	38	*
ED7418	0:51f1ef89ec7b	39	* Author: Adam Dunkels <adam@sics.se>
ED7418	0:51f1ef89ec7b	40	*
ED7418	0:51f1ef89ec7b	41	*/
ED7418	0:51f1ef89ec7b	42
ED7418	0:51f1ef89ec7b	43	#include "lwip/opt.h"
ED7418	0:51f1ef89ec7b	44
ED7418	0:51f1ef89ec7b	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
ED7418	0:51f1ef89ec7b	46
ED7418	0:51f1ef89ec7b	47	#include "lwip/def.h"
ED7418	0:51f1ef89ec7b	48	#include "lwip/mem.h"
ED7418	0:51f1ef89ec7b	49	#include "lwip/memp.h"
ED7418	0:51f1ef89ec7b	50	#include "lwip/snmp.h"
ED7418	0:51f1ef89ec7b	51	#include "lwip/tcp.h"
ED7418	0:51f1ef89ec7b	52	#include "lwip/tcp_impl.h"
ED7418	0:51f1ef89ec7b	53	#include "lwip/debug.h"
ED7418	0:51f1ef89ec7b	54	#include "lwip/stats.h"
ED7418	0:51f1ef89ec7b	55
ED7418	0:51f1ef89ec7b	56	#include <string.h>
ED7418	0:51f1ef89ec7b	57
ED7418	0:51f1ef89ec7b	58	const char * const tcp_state_str[] = {
ED7418	0:51f1ef89ec7b	59	"CLOSED",
ED7418	0:51f1ef89ec7b	60	"LISTEN",
ED7418	0:51f1ef89ec7b	61	"SYN_SENT",
ED7418	0:51f1ef89ec7b	62	"SYN_RCVD",
ED7418	0:51f1ef89ec7b	63	"ESTABLISHED",
ED7418	0:51f1ef89ec7b	64	"FIN_WAIT_1",
ED7418	0:51f1ef89ec7b	65	"FIN_WAIT_2",
ED7418	0:51f1ef89ec7b	66	"CLOSE_WAIT",
ED7418	0:51f1ef89ec7b	67	"CLOSING",
ED7418	0:51f1ef89ec7b	68	"LAST_ACK",
ED7418	0:51f1ef89ec7b	69	"TIME_WAIT"
ED7418	0:51f1ef89ec7b	70	};
ED7418	0:51f1ef89ec7b	71
ED7418	0:51f1ef89ec7b	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
ED7418	0:51f1ef89ec7b	73	u32_t tcp_ticks;
ED7418	0:51f1ef89ec7b	74	const u8_t tcp_backoff[13] =
ED7418	0:51f1ef89ec7b	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
ED7418	0:51f1ef89ec7b	76	/* Times per slowtmr hits */
ED7418	0:51f1ef89ec7b	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
ED7418	0:51f1ef89ec7b	78
ED7418	0:51f1ef89ec7b	79	/* The TCP PCB lists. */
ED7418	0:51f1ef89ec7b	80
ED7418	0:51f1ef89ec7b	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
ED7418	0:51f1ef89ec7b	82	struct tcp_pcb *tcp_bound_pcbs;
ED7418	0:51f1ef89ec7b	83	/** List of all TCP PCBs in LISTEN state */
ED7418	0:51f1ef89ec7b	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
ED7418	0:51f1ef89ec7b	85	/** List of all TCP PCBs that are in a state in which
ED7418	0:51f1ef89ec7b	86	* they accept or send data. */
ED7418	0:51f1ef89ec7b	87	struct tcp_pcb *tcp_active_pcbs;
ED7418	0:51f1ef89ec7b	88	/** List of all TCP PCBs in TIME-WAIT state */
ED7418	0:51f1ef89ec7b	89	struct tcp_pcb *tcp_tw_pcbs;
ED7418	0:51f1ef89ec7b	90
ED7418	0:51f1ef89ec7b	91	#define NUM_TCP_PCB_LISTS 4
ED7418	0:51f1ef89ec7b	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
ED7418	0:51f1ef89ec7b	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
ED7418	0:51f1ef89ec7b	94	struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
ED7418	0:51f1ef89ec7b	95	&tcp_active_pcbs, &tcp_tw_pcbs};
ED7418	0:51f1ef89ec7b	96
ED7418	0:51f1ef89ec7b	97	/** Only used for temporary storage. */
ED7418	0:51f1ef89ec7b	98	struct tcp_pcb *tcp_tmp_pcb;
ED7418	0:51f1ef89ec7b	99
ED7418	0:51f1ef89ec7b	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
ED7418	0:51f1ef89ec7b	101	static u8_t tcp_timer;
ED7418	0:51f1ef89ec7b	102	static u16_t tcp_new_port(void);
ED7418	0:51f1ef89ec7b	103
ED7418	0:51f1ef89ec7b	104	/**
ED7418	0:51f1ef89ec7b	105	* Called periodically to dispatch TCP timers.
ED7418	0:51f1ef89ec7b	106	*
ED7418	0:51f1ef89ec7b	107	*/
ED7418	0:51f1ef89ec7b	108	void
ED7418	0:51f1ef89ec7b	109	tcp_tmr(void)
ED7418	0:51f1ef89ec7b	110	{
ED7418	0:51f1ef89ec7b	111	/* Call tcp_fasttmr() every 250 ms */
ED7418	0:51f1ef89ec7b	112	tcp_fasttmr();
ED7418	0:51f1ef89ec7b	113
ED7418	0:51f1ef89ec7b	114	if (++tcp_timer & 1) {
ED7418	0:51f1ef89ec7b	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
ED7418	0:51f1ef89ec7b	116	tcp_tmr() is called. */
ED7418	0:51f1ef89ec7b	117	tcp_slowtmr();
ED7418	0:51f1ef89ec7b	118	}
ED7418	0:51f1ef89ec7b	119	}
ED7418	0:51f1ef89ec7b	120
ED7418	0:51f1ef89ec7b	121	/**
ED7418	0:51f1ef89ec7b	122	* Closes the TX side of a connection held by the PCB.
ED7418	0:51f1ef89ec7b	123	* For tcp_close(), a RST is sent if the application didn't receive all data
ED7418	0:51f1ef89ec7b	124	* (tcp_recved() not called for all data passed to recv callback).
ED7418	0:51f1ef89ec7b	125	*
ED7418	0:51f1ef89ec7b	126	* Listening pcbs are freed and may not be referenced any more.
ED7418	0:51f1ef89ec7b	127	* Connection pcbs are freed if not yet connected and may not be referenced
ED7418	0:51f1ef89ec7b	128	* any more. If a connection is established (at least SYN received or in
ED7418	0:51f1ef89ec7b	129	* a closing state), the connection is closed, and put in a closing state.
ED7418	0:51f1ef89ec7b	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
ED7418	0:51f1ef89ec7b	131	* unsafe to reference it.
ED7418	0:51f1ef89ec7b	132	*
ED7418	0:51f1ef89ec7b	133	* @param pcb the tcp_pcb to close
ED7418	0:51f1ef89ec7b	134	* @return ERR_OK if connection has been closed
ED7418	0:51f1ef89ec7b	135	* another err_t if closing failed and pcb is not freed
ED7418	0:51f1ef89ec7b	136	*/
ED7418	0:51f1ef89ec7b	137	static err_t
ED7418	0:51f1ef89ec7b	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
ED7418	0:51f1ef89ec7b	139	{
ED7418	0:51f1ef89ec7b	140	err_t err;
ED7418	0:51f1ef89ec7b	141
ED7418	0:51f1ef89ec7b	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
ED7418	0:51f1ef89ec7b	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
ED7418	0:51f1ef89ec7b	144	/* Not all data received by application, send RST to tell the remote
ED7418	0:51f1ef89ec7b	145	side about this. */
ED7418	0:51f1ef89ec7b	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
ED7418	0:51f1ef89ec7b	147
ED7418	0:51f1ef89ec7b	148	/* don't call tcp_abort here: we must not deallocate the pcb since
ED7418	0:51f1ef89ec7b	149	that might not be expected when calling tcp_close */
ED7418	0:51f1ef89ec7b	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
ED7418	0:51f1ef89ec7b	151	pcb->local_port, pcb->remote_port);
ED7418	0:51f1ef89ec7b	152
ED7418	0:51f1ef89ec7b	153	tcp_pcb_purge(pcb);
ED7418	0:51f1ef89ec7b	154
ED7418	0:51f1ef89ec7b	155	/* TODO: to which state do we move now? */
ED7418	0:51f1ef89ec7b	156
ED7418	0:51f1ef89ec7b	157	/* move to TIME_WAIT since we close actively */
ED7418	0:51f1ef89ec7b	158	TCP_RMV(&tcp_active_pcbs, pcb);
ED7418	0:51f1ef89ec7b	159	pcb->state = TIME_WAIT;
ED7418	0:51f1ef89ec7b	160	TCP_REG(&tcp_tw_pcbs, pcb);
ED7418	0:51f1ef89ec7b	161
ED7418	0:51f1ef89ec7b	162	return ERR_OK;
ED7418	0:51f1ef89ec7b	163	}
ED7418	0:51f1ef89ec7b	164	}
ED7418	0:51f1ef89ec7b	165
ED7418	0:51f1ef89ec7b	166	switch (pcb->state) {
ED7418	0:51f1ef89ec7b	167	case CLOSED:
ED7418	0:51f1ef89ec7b	168	/* Closing a pcb in the CLOSED state might seem erroneous,
ED7418	0:51f1ef89ec7b	169	* however, it is in this state once allocated and as yet unused
ED7418	0:51f1ef89ec7b	170	* and the user needs some way to free it should the need arise.
ED7418	0:51f1ef89ec7b	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
ED7418	0:51f1ef89ec7b	172	* or for a pcb that has been used and then entered the CLOSED state
ED7418	0:51f1ef89ec7b	173	* is erroneous, but this should never happen as the pcb has in those cases
ED7418	0:51f1ef89ec7b	174	* been freed, and so any remaining handles are bogus. */
ED7418	0:51f1ef89ec7b	175	err = ERR_OK;
ED7418	0:51f1ef89ec7b	176	TCP_RMV(&tcp_bound_pcbs, pcb);
ED7418	0:51f1ef89ec7b	177	memp_free(MEMP_TCP_PCB, pcb);
ED7418	0:51f1ef89ec7b	178	pcb = NULL;
ED7418	0:51f1ef89ec7b	179	break;
ED7418	0:51f1ef89ec7b	180	case LISTEN:
ED7418	0:51f1ef89ec7b	181	err = ERR_OK;
ED7418	0:51f1ef89ec7b	182	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
ED7418	0:51f1ef89ec7b	183	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
ED7418	0:51f1ef89ec7b	184	pcb = NULL;
ED7418	0:51f1ef89ec7b	185	break;
ED7418	0:51f1ef89ec7b	186	case SYN_SENT:
ED7418	0:51f1ef89ec7b	187	err = ERR_OK;
ED7418	0:51f1ef89ec7b	188	tcp_pcb_remove(&tcp_active_pcbs, pcb);
ED7418	0:51f1ef89ec7b	189	memp_free(MEMP_TCP_PCB, pcb);
ED7418	0:51f1ef89ec7b	190	pcb = NULL;
ED7418	0:51f1ef89ec7b	191	snmp_inc_tcpattemptfails();
ED7418	0:51f1ef89ec7b	192	break;
ED7418	0:51f1ef89ec7b	193	case SYN_RCVD:
ED7418	0:51f1ef89ec7b	194	err = tcp_send_fin(pcb);
ED7418	0:51f1ef89ec7b	195	if (err == ERR_OK) {
ED7418	0:51f1ef89ec7b	196	snmp_inc_tcpattemptfails();
ED7418	0:51f1ef89ec7b	197	pcb->state = FIN_WAIT_1;
ED7418	0:51f1ef89ec7b	198	}
ED7418	0:51f1ef89ec7b	199	break;
ED7418	0:51f1ef89ec7b	200	case ESTABLISHED:
ED7418	0:51f1ef89ec7b	201	err = tcp_send_fin(pcb);
ED7418	0:51f1ef89ec7b	202	if (err == ERR_OK) {
ED7418	0:51f1ef89ec7b	203	snmp_inc_tcpestabresets();
ED7418	0:51f1ef89ec7b	204	pcb->state = FIN_WAIT_1;
ED7418	0:51f1ef89ec7b	205	}
ED7418	0:51f1ef89ec7b	206	break;
ED7418	0:51f1ef89ec7b	207	case CLOSE_WAIT:
ED7418	0:51f1ef89ec7b	208	err = tcp_send_fin(pcb);
ED7418	0:51f1ef89ec7b	209	if (err == ERR_OK) {
ED7418	0:51f1ef89ec7b	210	snmp_inc_tcpestabresets();
ED7418	0:51f1ef89ec7b	211	pcb->state = LAST_ACK;
ED7418	0:51f1ef89ec7b	212	}
ED7418	0:51f1ef89ec7b	213	break;
ED7418	0:51f1ef89ec7b	214	default:
ED7418	0:51f1ef89ec7b	215	/* Has already been closed, do nothing. */
ED7418	0:51f1ef89ec7b	216	err = ERR_OK;
ED7418	0:51f1ef89ec7b	217	pcb = NULL;
ED7418	0:51f1ef89ec7b	218	break;
ED7418	0:51f1ef89ec7b	219	}
ED7418	0:51f1ef89ec7b	220
ED7418	0:51f1ef89ec7b	221	if (pcb != NULL && err == ERR_OK) {
ED7418	0:51f1ef89ec7b	222	/* To ensure all data has been sent when tcp_close returns, we have
ED7418	0:51f1ef89ec7b	223	to make sure tcp_output doesn't fail.
ED7418	0:51f1ef89ec7b	224	Since we don't really have to ensure all data has been sent when tcp_close
ED7418	0:51f1ef89ec7b	225	returns (unsent data is sent from tcp timer functions, also), we don't care
ED7418	0:51f1ef89ec7b	226	for the return value of tcp_output for now. */
ED7418	0:51f1ef89ec7b	227	/* @todo: When implementing SO_LINGER, this must be changed somehow:
ED7418	0:51f1ef89ec7b	228	If SOF_LINGER is set, the data should be sent and acked before close returns.
ED7418	0:51f1ef89ec7b	229	This can only be valid for sequential APIs, not for the raw API. */
ED7418	0:51f1ef89ec7b	230	tcp_output(pcb);
ED7418	0:51f1ef89ec7b	231	}
ED7418	0:51f1ef89ec7b	232	return err;
ED7418	0:51f1ef89ec7b	233	}
ED7418	0:51f1ef89ec7b	234
ED7418	0:51f1ef89ec7b	235	/**
ED7418	0:51f1ef89ec7b	236	* Closes the connection held by the PCB.
ED7418	0:51f1ef89ec7b	237	*
ED7418	0:51f1ef89ec7b	238	* Listening pcbs are freed and may not be referenced any more.
ED7418	0:51f1ef89ec7b	239	* Connection pcbs are freed if not yet connected and may not be referenced
ED7418	0:51f1ef89ec7b	240	* any more. If a connection is established (at least SYN received or in
ED7418	0:51f1ef89ec7b	241	* a closing state), the connection is closed, and put in a closing state.
ED7418	0:51f1ef89ec7b	242	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
ED7418	0:51f1ef89ec7b	243	* unsafe to reference it (unless an error is returned).
ED7418	0:51f1ef89ec7b	244	*
ED7418	0:51f1ef89ec7b	245	* @param pcb the tcp_pcb to close
ED7418	0:51f1ef89ec7b	246	* @return ERR_OK if connection has been closed
ED7418	0:51f1ef89ec7b	247	* another err_t if closing failed and pcb is not freed
ED7418	0:51f1ef89ec7b	248	*/
ED7418	0:51f1ef89ec7b	249	err_t
ED7418	0:51f1ef89ec7b	250	tcp_close(struct tcp_pcb *pcb)
ED7418	0:51f1ef89ec7b	251	{
ED7418	0:51f1ef89ec7b	252	#if TCP_DEBUG
ED7418	0:51f1ef89ec7b	253	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
ED7418	0:51f1ef89ec7b	254	tcp_debug_print_state(pcb->state);
ED7418	0:51f1ef89ec7b	255	#endif /* TCP_DEBUG */
ED7418	0:51f1ef89ec7b	256
ED7418	0:51f1ef89ec7b	257	if (pcb->state != LISTEN) {
ED7418	0:51f1ef89ec7b	258	/* Set a flag not to receive any more data... */
ED7418	0:51f1ef89ec7b	259	pcb->flags \|= TF_RXCLOSED;
ED7418	0:51f1ef89ec7b	260	}
ED7418	0:51f1ef89ec7b	261	/* ... and close */
ED7418	0:51f1ef89ec7b	262	return tcp_close_shutdown(pcb, 1);
ED7418	0:51f1ef89ec7b	263	}
ED7418	0:51f1ef89ec7b	264
ED7418	0:51f1ef89ec7b	265	/**
ED7418	0:51f1ef89ec7b	266	* Causes all or part of a full-duplex connection of this PCB to be shut down.
ED7418	0:51f1ef89ec7b	267	* This doesn't deallocate the PCB!
ED7418	0:51f1ef89ec7b	268	*
ED7418	0:51f1ef89ec7b	269	* @param pcb PCB to shutdown
ED7418	0:51f1ef89ec7b	270	* @param shut_rx shut down receive side if this is != 0
ED7418	0:51f1ef89ec7b	271	* @param shut_tx shut down send side if this is != 0
ED7418	0:51f1ef89ec7b	272	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
ED7418	0:51f1ef89ec7b	273	* another err_t on error.
ED7418	0:51f1ef89ec7b	274	*/
ED7418	0:51f1ef89ec7b	275	err_t
ED7418	0:51f1ef89ec7b	276	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
ED7418	0:51f1ef89ec7b	277	{
ED7418	0:51f1ef89ec7b	278	if (pcb->state == LISTEN) {
ED7418	0:51f1ef89ec7b	279	return ERR_CONN;
ED7418	0:51f1ef89ec7b	280	}
ED7418	0:51f1ef89ec7b	281	if (shut_rx) {
ED7418	0:51f1ef89ec7b	282	/* shut down the receive side: free buffered data... */
ED7418	0:51f1ef89ec7b	283	if (pcb->refused_data != NULL) {
ED7418	0:51f1ef89ec7b	284	pbuf_free(pcb->refused_data);
ED7418	0:51f1ef89ec7b	285	pcb->refused_data = NULL;
ED7418	0:51f1ef89ec7b	286	}
ED7418	0:51f1ef89ec7b	287	/* ... and set a flag not to receive any more data */
ED7418	0:51f1ef89ec7b	288	pcb->flags \|= TF_RXCLOSED;
ED7418	0:51f1ef89ec7b	289	}
ED7418	0:51f1ef89ec7b	290	if (shut_tx) {
ED7418	0:51f1ef89ec7b	291	/* This can't happen twice since if it succeeds, the pcb's state is changed.
ED7418	0:51f1ef89ec7b	292	Only close in these states as the others directly deallocate the PCB */
ED7418	0:51f1ef89ec7b	293	switch (pcb->state) {
ED7418	0:51f1ef89ec7b	294	case SYN_RCVD:
ED7418	0:51f1ef89ec7b	295	case ESTABLISHED:
ED7418	0:51f1ef89ec7b	296	case CLOSE_WAIT:
ED7418	0:51f1ef89ec7b	297	return tcp_close_shutdown(pcb, 0);
ED7418	0:51f1ef89ec7b	298	default:
ED7418	0:51f1ef89ec7b	299	/* don't shut down other states */
ED7418	0:51f1ef89ec7b	300	break;
ED7418	0:51f1ef89ec7b	301	}
ED7418	0:51f1ef89ec7b	302	}
ED7418	0:51f1ef89ec7b	303	/* @todo: return another err_t if not in correct state or already shut? */
ED7418	0:51f1ef89ec7b	304	return ERR_OK;
ED7418	0:51f1ef89ec7b	305	}
ED7418	0:51f1ef89ec7b	306
ED7418	0:51f1ef89ec7b	307	/**
ED7418	0:51f1ef89ec7b	308	* Abandons a connection and optionally sends a RST to the remote
ED7418	0:51f1ef89ec7b	309	* host. Deletes the local protocol control block. This is done when
ED7418	0:51f1ef89ec7b	310	* a connection is killed because of shortage of memory.
ED7418	0:51f1ef89ec7b	311	*
ED7418	0:51f1ef89ec7b	312	* @param pcb the tcp_pcb to abort
ED7418	0:51f1ef89ec7b	313	* @param reset boolean to indicate whether a reset should be sent
ED7418	0:51f1ef89ec7b	314	*/
ED7418	0:51f1ef89ec7b	315	void
ED7418	0:51f1ef89ec7b	316	tcp_abandon(struct tcp_pcb *pcb, int reset)
ED7418	0:51f1ef89ec7b	317	{
ED7418	0:51f1ef89ec7b	318	u32_t seqno, ackno;
ED7418	0:51f1ef89ec7b	319	u16_t remote_port, local_port;
ED7418	0:51f1ef89ec7b	320	ip_addr_t remote_ip, local_ip;
ED7418	0:51f1ef89ec7b	321	#if LWIP_CALLBACK_API
ED7418	0:51f1ef89ec7b	322	tcp_err_fn errf;
ED7418	0:51f1ef89ec7b	323	#endif /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	324	void *errf_arg;
ED7418	0:51f1ef89ec7b	325
ED7418	0:51f1ef89ec7b	326	/* pcb->state LISTEN not allowed here */
ED7418	0:51f1ef89ec7b	327	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
ED7418	0:51f1ef89ec7b	328	pcb->state != LISTEN);
ED7418	0:51f1ef89ec7b	329	/* Figure out on which TCP PCB list we are, and remove us. If we
ED7418	0:51f1ef89ec7b	330	are in an active state, call the receive function associated with
ED7418	0:51f1ef89ec7b	331	the PCB with a NULL argument, and send an RST to the remote end. */
ED7418	0:51f1ef89ec7b	332	if (pcb->state == TIME_WAIT) {
ED7418	0:51f1ef89ec7b	333	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
ED7418	0:51f1ef89ec7b	334	memp_free(MEMP_TCP_PCB, pcb);
ED7418	0:51f1ef89ec7b	335	} else {
ED7418	0:51f1ef89ec7b	336	seqno = pcb->snd_nxt;
ED7418	0:51f1ef89ec7b	337	ackno = pcb->rcv_nxt;
ED7418	0:51f1ef89ec7b	338	ip_addr_copy(local_ip, pcb->local_ip);
ED7418	0:51f1ef89ec7b	339	ip_addr_copy(remote_ip, pcb->remote_ip);
ED7418	0:51f1ef89ec7b	340	local_port = pcb->local_port;
ED7418	0:51f1ef89ec7b	341	remote_port = pcb->remote_port;
ED7418	0:51f1ef89ec7b	342	#if LWIP_CALLBACK_API
ED7418	0:51f1ef89ec7b	343	errf = pcb->errf;
ED7418	0:51f1ef89ec7b	344	#endif /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	345	errf_arg = pcb->callback_arg;
ED7418	0:51f1ef89ec7b	346	tcp_pcb_remove(&tcp_active_pcbs, pcb);
ED7418	0:51f1ef89ec7b	347	if (pcb->unacked != NULL) {
ED7418	0:51f1ef89ec7b	348	tcp_segs_free(pcb->unacked);
ED7418	0:51f1ef89ec7b	349	}
ED7418	0:51f1ef89ec7b	350	if (pcb->unsent != NULL) {
ED7418	0:51f1ef89ec7b	351	tcp_segs_free(pcb->unsent);
ED7418	0:51f1ef89ec7b	352	}
ED7418	0:51f1ef89ec7b	353	#if TCP_QUEUE_OOSEQ
ED7418	0:51f1ef89ec7b	354	if (pcb->ooseq != NULL) {
ED7418	0:51f1ef89ec7b	355	tcp_segs_free(pcb->ooseq);
ED7418	0:51f1ef89ec7b	356	}
ED7418	0:51f1ef89ec7b	357	#endif /* TCP_QUEUE_OOSEQ */
ED7418	0:51f1ef89ec7b	358	memp_free(MEMP_TCP_PCB, pcb);
ED7418	0:51f1ef89ec7b	359	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
ED7418	0:51f1ef89ec7b	360	if (reset) {
ED7418	0:51f1ef89ec7b	361	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
ED7418	0:51f1ef89ec7b	362	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
ED7418	0:51f1ef89ec7b	363	}
ED7418	0:51f1ef89ec7b	364	}
ED7418	0:51f1ef89ec7b	365	}
ED7418	0:51f1ef89ec7b	366
ED7418	0:51f1ef89ec7b	367	/**
ED7418	0:51f1ef89ec7b	368	* Aborts the connection by sending a RST (reset) segment to the remote
ED7418	0:51f1ef89ec7b	369	* host. The pcb is deallocated. This function never fails.
ED7418	0:51f1ef89ec7b	370	*
ED7418	0:51f1ef89ec7b	371	* ATTENTION: When calling this from one of the TCP callbacks, make
ED7418	0:51f1ef89ec7b	372	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
ED7418	0:51f1ef89ec7b	373	* or you will risk accessing deallocated memory or memory leaks!
ED7418	0:51f1ef89ec7b	374	*
ED7418	0:51f1ef89ec7b	375	* @param pcb the tcp pcb to abort
ED7418	0:51f1ef89ec7b	376	*/
ED7418	0:51f1ef89ec7b	377	void
ED7418	0:51f1ef89ec7b	378	tcp_abort(struct tcp_pcb *pcb)
ED7418	0:51f1ef89ec7b	379	{
ED7418	0:51f1ef89ec7b	380	tcp_abandon(pcb, 1);
ED7418	0:51f1ef89ec7b	381	}
ED7418	0:51f1ef89ec7b	382
ED7418	0:51f1ef89ec7b	383	/**
ED7418	0:51f1ef89ec7b	384	* Binds the connection to a local portnumber and IP address. If the
ED7418	0:51f1ef89ec7b	385	* IP address is not given (i.e., ipaddr == NULL), the IP address of
ED7418	0:51f1ef89ec7b	386	* the outgoing network interface is used instead.
ED7418	0:51f1ef89ec7b	387	*
ED7418	0:51f1ef89ec7b	388	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
ED7418	0:51f1ef89ec7b	389	* already bound!)
ED7418	0:51f1ef89ec7b	390	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
ED7418	0:51f1ef89ec7b	391	* to any local address
ED7418	0:51f1ef89ec7b	392	* @param port the local port to bind to
ED7418	0:51f1ef89ec7b	393	* @return ERR_USE if the port is already in use
ED7418	0:51f1ef89ec7b	394	* ERR_OK if bound
ED7418	0:51f1ef89ec7b	395	*/
ED7418	0:51f1ef89ec7b	396	err_t
ED7418	0:51f1ef89ec7b	397	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
ED7418	0:51f1ef89ec7b	398	{
ED7418	0:51f1ef89ec7b	399	int i;
ED7418	0:51f1ef89ec7b	400	int max_pcb_list = NUM_TCP_PCB_LISTS;
ED7418	0:51f1ef89ec7b	401	struct tcp_pcb *cpcb;
ED7418	0:51f1ef89ec7b	402
ED7418	0:51f1ef89ec7b	403	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
ED7418	0:51f1ef89ec7b	404
ED7418	0:51f1ef89ec7b	405	#if SO_REUSE
ED7418	0:51f1ef89ec7b	406	/* Unless the REUSEADDR flag is set,
ED7418	0:51f1ef89ec7b	407	we have to check the pcbs in TIME-WAIT state, also.
ED7418	0:51f1ef89ec7b	408	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
ED7418	0:51f1ef89ec7b	409	packets using both local and remote IP addresses and ports to distinguish.
ED7418	0:51f1ef89ec7b	410	*/
ED7418	0:51f1ef89ec7b	411	#if SO_REUSE
ED7418	0:51f1ef89ec7b	412	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
ED7418	0:51f1ef89ec7b	413	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
ED7418	0:51f1ef89ec7b	414	}
ED7418	0:51f1ef89ec7b	415	#endif /* SO_REUSE */
ED7418	0:51f1ef89ec7b	416	#endif /* SO_REUSE */
ED7418	0:51f1ef89ec7b	417
ED7418	0:51f1ef89ec7b	418	if (port == 0) {
ED7418	0:51f1ef89ec7b	419	port = tcp_new_port();
ED7418	0:51f1ef89ec7b	420	}
ED7418	0:51f1ef89ec7b	421
ED7418	0:51f1ef89ec7b	422	/* Check if the address already is in use (on all lists) */
ED7418	0:51f1ef89ec7b	423	for (i = 0; i < max_pcb_list; i++) {
ED7418	0:51f1ef89ec7b	424	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
ED7418	0:51f1ef89ec7b	425	if (cpcb->local_port == port) {
ED7418	0:51f1ef89ec7b	426	#if SO_REUSE
ED7418	0:51f1ef89ec7b	427	/* Omit checking for the same port if both pcbs have REUSEADDR set.
ED7418	0:51f1ef89ec7b	428	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
ED7418	0:51f1ef89ec7b	429	tcp_connect. */
ED7418	0:51f1ef89ec7b	430	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
ED7418	0:51f1ef89ec7b	431	((cpcb->so_options & SOF_REUSEADDR) == 0))
ED7418	0:51f1ef89ec7b	432	#endif /* SO_REUSE */
ED7418	0:51f1ef89ec7b	433	{
ED7418	0:51f1ef89ec7b	434	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
ED7418	0:51f1ef89ec7b	435	ip_addr_isany(ipaddr) \|\|
ED7418	0:51f1ef89ec7b	436	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
ED7418	0:51f1ef89ec7b	437	return ERR_USE;
ED7418	0:51f1ef89ec7b	438	}
ED7418	0:51f1ef89ec7b	439	}
ED7418	0:51f1ef89ec7b	440	}
ED7418	0:51f1ef89ec7b	441	}
ED7418	0:51f1ef89ec7b	442	}
ED7418	0:51f1ef89ec7b	443
ED7418	0:51f1ef89ec7b	444	if (!ip_addr_isany(ipaddr)) {
ED7418	0:51f1ef89ec7b	445	pcb->local_ip = *ipaddr;
ED7418	0:51f1ef89ec7b	446	}
ED7418	0:51f1ef89ec7b	447	pcb->local_port = port;
ED7418	0:51f1ef89ec7b	448	TCP_REG(&tcp_bound_pcbs, pcb);
ED7418	0:51f1ef89ec7b	449	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
ED7418	0:51f1ef89ec7b	450	return ERR_OK;
ED7418	0:51f1ef89ec7b	451	}
ED7418	0:51f1ef89ec7b	452	#if LWIP_CALLBACK_API
ED7418	0:51f1ef89ec7b	453	/**
ED7418	0:51f1ef89ec7b	454	* Default accept callback if no accept callback is specified by the user.
ED7418	0:51f1ef89ec7b	455	*/
ED7418	0:51f1ef89ec7b	456	static err_t
ED7418	0:51f1ef89ec7b	457	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
ED7418	0:51f1ef89ec7b	458	{
ED7418	0:51f1ef89ec7b	459	LWIP_UNUSED_ARG(arg);
ED7418	0:51f1ef89ec7b	460	LWIP_UNUSED_ARG(pcb);
ED7418	0:51f1ef89ec7b	461	LWIP_UNUSED_ARG(err);
ED7418	0:51f1ef89ec7b	462
ED7418	0:51f1ef89ec7b	463	return ERR_ABRT;
ED7418	0:51f1ef89ec7b	464	}
ED7418	0:51f1ef89ec7b	465	#endif /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	466
ED7418	0:51f1ef89ec7b	467	/**
ED7418	0:51f1ef89ec7b	468	* Set the state of the connection to be LISTEN, which means that it
ED7418	0:51f1ef89ec7b	469	* is able to accept incoming connections. The protocol control block
ED7418	0:51f1ef89ec7b	470	* is reallocated in order to consume less memory. Setting the
ED7418	0:51f1ef89ec7b	471	* connection to LISTEN is an irreversible process.
ED7418	0:51f1ef89ec7b	472	*
ED7418	0:51f1ef89ec7b	473	* @param pcb the original tcp_pcb
ED7418	0:51f1ef89ec7b	474	* @param backlog the incoming connections queue limit
ED7418	0:51f1ef89ec7b	475	* @return tcp_pcb used for listening, consumes less memory.
ED7418	0:51f1ef89ec7b	476	*
ED7418	0:51f1ef89ec7b	477	* @note The original tcp_pcb is freed. This function therefore has to be
ED7418	0:51f1ef89ec7b	478	* called like this:
ED7418	0:51f1ef89ec7b	479	* tpcb = tcp_listen(tpcb);
ED7418	0:51f1ef89ec7b	480	*/
ED7418	0:51f1ef89ec7b	481	struct tcp_pcb *
ED7418	0:51f1ef89ec7b	482	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
ED7418	0:51f1ef89ec7b	483	{
ED7418	0:51f1ef89ec7b	484	struct tcp_pcb_listen *lpcb;
ED7418	0:51f1ef89ec7b	485
ED7418	0:51f1ef89ec7b	486	LWIP_UNUSED_ARG(backlog);
ED7418	0:51f1ef89ec7b	487	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
ED7418	0:51f1ef89ec7b	488
ED7418	0:51f1ef89ec7b	489	/* already listening? */
ED7418	0:51f1ef89ec7b	490	if (pcb->state == LISTEN) {
ED7418	0:51f1ef89ec7b	491	return pcb;
ED7418	0:51f1ef89ec7b	492	}
ED7418	0:51f1ef89ec7b	493	#if SO_REUSE
ED7418	0:51f1ef89ec7b	494	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
ED7418	0:51f1ef89ec7b	495	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
ED7418	0:51f1ef89ec7b	496	is declared (listen-/connection-pcb), we have to make sure now that
ED7418	0:51f1ef89ec7b	497	this port is only used once for every local IP. */
ED7418	0:51f1ef89ec7b	498	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
ED7418	0:51f1ef89ec7b	499	if (lpcb->local_port == pcb->local_port) {
ED7418	0:51f1ef89ec7b	500	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
ED7418	0:51f1ef89ec7b	501	/* this address/port is already used */
ED7418	0:51f1ef89ec7b	502	return NULL;
ED7418	0:51f1ef89ec7b	503	}
ED7418	0:51f1ef89ec7b	504	}
ED7418	0:51f1ef89ec7b	505	}
ED7418	0:51f1ef89ec7b	506	}
ED7418	0:51f1ef89ec7b	507	#endif /* SO_REUSE */
ED7418	0:51f1ef89ec7b	508	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
ED7418	0:51f1ef89ec7b	509	if (lpcb == NULL) {
ED7418	0:51f1ef89ec7b	510	return NULL;
ED7418	0:51f1ef89ec7b	511	}
ED7418	0:51f1ef89ec7b	512	lpcb->callback_arg = pcb->callback_arg;
ED7418	0:51f1ef89ec7b	513	lpcb->local_port = pcb->local_port;
ED7418	0:51f1ef89ec7b	514	lpcb->state = LISTEN;
ED7418	0:51f1ef89ec7b	515	lpcb->prio = pcb->prio;
ED7418	0:51f1ef89ec7b	516	lpcb->so_options = pcb->so_options;
ED7418	0:51f1ef89ec7b	517	lpcb->so_options \|= SOF_ACCEPTCONN;
ED7418	0:51f1ef89ec7b	518	lpcb->ttl = pcb->ttl;
ED7418	0:51f1ef89ec7b	519	lpcb->tos = pcb->tos;
ED7418	0:51f1ef89ec7b	520	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
ED7418	0:51f1ef89ec7b	521	TCP_RMV(&tcp_bound_pcbs, pcb);
ED7418	0:51f1ef89ec7b	522	memp_free(MEMP_TCP_PCB, pcb);
ED7418	0:51f1ef89ec7b	523	#if LWIP_CALLBACK_API
ED7418	0:51f1ef89ec7b	524	lpcb->accept = tcp_accept_null;
ED7418	0:51f1ef89ec7b	525	#endif /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	526	#if TCP_LISTEN_BACKLOG
ED7418	0:51f1ef89ec7b	527	lpcb->accepts_pending = 0;
ED7418	0:51f1ef89ec7b	528	lpcb->backlog = (backlog ? backlog : 1);
ED7418	0:51f1ef89ec7b	529	#endif /* TCP_LISTEN_BACKLOG */
ED7418	0:51f1ef89ec7b	530	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
ED7418	0:51f1ef89ec7b	531	return (struct tcp_pcb *)lpcb;
ED7418	0:51f1ef89ec7b	532	}
ED7418	0:51f1ef89ec7b	533
ED7418	0:51f1ef89ec7b	534	/**
ED7418	0:51f1ef89ec7b	535	* Update the state that tracks the available window space to advertise.
ED7418	0:51f1ef89ec7b	536	*
ED7418	0:51f1ef89ec7b	537	* Returns how much extra window would be advertised if we sent an
ED7418	0:51f1ef89ec7b	538	* update now.
ED7418	0:51f1ef89ec7b	539	*/
ED7418	0:51f1ef89ec7b	540	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
ED7418	0:51f1ef89ec7b	541	{
ED7418	0:51f1ef89ec7b	542	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
ED7418	0:51f1ef89ec7b	543
ED7418	0:51f1ef89ec7b	544	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
ED7418	0:51f1ef89ec7b	545	/* we can advertise more window */
ED7418	0:51f1ef89ec7b	546	pcb->rcv_ann_wnd = pcb->rcv_wnd;
ED7418	0:51f1ef89ec7b	547	return new_right_edge - pcb->rcv_ann_right_edge;
ED7418	0:51f1ef89ec7b	548	} else {
ED7418	0:51f1ef89ec7b	549	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
ED7418	0:51f1ef89ec7b	550	/* Can happen due to other end sending out of advertised window,
ED7418	0:51f1ef89ec7b	551	* but within actual available (but not yet advertised) window */
ED7418	0:51f1ef89ec7b	552	pcb->rcv_ann_wnd = 0;
ED7418	0:51f1ef89ec7b	553	} else {
ED7418	0:51f1ef89ec7b	554	/* keep the right edge of window constant */
ED7418	0:51f1ef89ec7b	555	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
ED7418	0:51f1ef89ec7b	556	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
ED7418	0:51f1ef89ec7b	557	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
ED7418	0:51f1ef89ec7b	558	}
ED7418	0:51f1ef89ec7b	559	return 0;
ED7418	0:51f1ef89ec7b	560	}
ED7418	0:51f1ef89ec7b	561	}
ED7418	0:51f1ef89ec7b	562
ED7418	0:51f1ef89ec7b	563	/**
ED7418	0:51f1ef89ec7b	564	* This function should be called by the application when it has
ED7418	0:51f1ef89ec7b	565	* processed the data. The purpose is to advertise a larger window
ED7418	0:51f1ef89ec7b	566	* when the data has been processed.
ED7418	0:51f1ef89ec7b	567	*
ED7418	0:51f1ef89ec7b	568	* @param pcb the tcp_pcb for which data is read
ED7418	0:51f1ef89ec7b	569	* @param len the amount of bytes that have been read by the application
ED7418	0:51f1ef89ec7b	570	*/
ED7418	0:51f1ef89ec7b	571	void
ED7418	0:51f1ef89ec7b	572	tcp_recved(struct tcp_pcb *pcb, u16_t len)
ED7418	0:51f1ef89ec7b	573	{
ED7418	0:51f1ef89ec7b	574	int wnd_inflation;
ED7418	0:51f1ef89ec7b	575
ED7418	0:51f1ef89ec7b	576	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
ED7418	0:51f1ef89ec7b	577	len <= 0xffff - pcb->rcv_wnd );
ED7418	0:51f1ef89ec7b	578
ED7418	0:51f1ef89ec7b	579	pcb->rcv_wnd += len;
ED7418	0:51f1ef89ec7b	580	if (pcb->rcv_wnd > TCP_WND) {
ED7418	0:51f1ef89ec7b	581	pcb->rcv_wnd = TCP_WND;
ED7418	0:51f1ef89ec7b	582	}
ED7418	0:51f1ef89ec7b	583
ED7418	0:51f1ef89ec7b	584	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
ED7418	0:51f1ef89ec7b	585
ED7418	0:51f1ef89ec7b	586	/* If the change in the right edge of window is significant (default
ED7418	0:51f1ef89ec7b	587	* watermark is TCP_WND/4), then send an explicit update now.
ED7418	0:51f1ef89ec7b	588	* Otherwise wait for a packet to be sent in the normal course of
ED7418	0:51f1ef89ec7b	589	* events (or more window to be available later) */
ED7418	0:51f1ef89ec7b	590	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
ED7418	0:51f1ef89ec7b	591	tcp_ack_now(pcb);
ED7418	0:51f1ef89ec7b	592	tcp_output(pcb);
ED7418	0:51f1ef89ec7b	593	}
ED7418	0:51f1ef89ec7b	594
ED7418	0:51f1ef89ec7b	595	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
ED7418	0:51f1ef89ec7b	596	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
ED7418	0:51f1ef89ec7b	597	}
ED7418	0:51f1ef89ec7b	598
ED7418	0:51f1ef89ec7b	599	/**
ED7418	0:51f1ef89ec7b	600	* A nastly hack featuring 'goto' statements that allocates a
ED7418	0:51f1ef89ec7b	601	* new TCP local port.
ED7418	0:51f1ef89ec7b	602	*
ED7418	0:51f1ef89ec7b	603	* @return a new (free) local TCP port number
ED7418	0:51f1ef89ec7b	604	*/
ED7418	0:51f1ef89ec7b	605	static u16_t
ED7418	0:51f1ef89ec7b	606	tcp_new_port(void)
ED7418	0:51f1ef89ec7b	607	{
ED7418	0:51f1ef89ec7b	608	int i;
ED7418	0:51f1ef89ec7b	609	struct tcp_pcb *pcb;
ED7418	0:51f1ef89ec7b	610	#ifndef TCP_LOCAL_PORT_RANGE_START
ED7418	0:51f1ef89ec7b	611	#define TCP_LOCAL_PORT_RANGE_START 4096
ED7418	0:51f1ef89ec7b	612	#define TCP_LOCAL_PORT_RANGE_END 0x7fff
ED7418	0:51f1ef89ec7b	613	#endif
ED7418	0:51f1ef89ec7b	614	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
ED7418	0:51f1ef89ec7b	615
ED7418	0:51f1ef89ec7b	616	again:
ED7418	0:51f1ef89ec7b	617	if (++port > TCP_LOCAL_PORT_RANGE_END) {
ED7418	0:51f1ef89ec7b	618	port = TCP_LOCAL_PORT_RANGE_START;
ED7418	0:51f1ef89ec7b	619	}
ED7418	0:51f1ef89ec7b	620	/* Check all PCB lists. */
ED7418	0:51f1ef89ec7b	621	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
ED7418	0:51f1ef89ec7b	622	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
ED7418	0:51f1ef89ec7b	623	if (pcb->local_port == port) {
ED7418	0:51f1ef89ec7b	624	goto again;
ED7418	0:51f1ef89ec7b	625	}
ED7418	0:51f1ef89ec7b	626	}
ED7418	0:51f1ef89ec7b	627	}
ED7418	0:51f1ef89ec7b	628	return port;
ED7418	0:51f1ef89ec7b	629	}
ED7418	0:51f1ef89ec7b	630
ED7418	0:51f1ef89ec7b	631	/**
ED7418	0:51f1ef89ec7b	632	* Connects to another host. The function given as the "connected"
ED7418	0:51f1ef89ec7b	633	* argument will be called when the connection has been established.
ED7418	0:51f1ef89ec7b	634	*
ED7418	0:51f1ef89ec7b	635	* @param pcb the tcp_pcb used to establish the connection
ED7418	0:51f1ef89ec7b	636	* @param ipaddr the remote ip address to connect to
ED7418	0:51f1ef89ec7b	637	* @param port the remote tcp port to connect to
ED7418	0:51f1ef89ec7b	638	* @param connected callback function to call when connected (or on error)
ED7418	0:51f1ef89ec7b	639	* @return ERR_VAL if invalid arguments are given
ED7418	0:51f1ef89ec7b	640	* ERR_OK if connect request has been sent
ED7418	0:51f1ef89ec7b	641	* other err_t values if connect request couldn't be sent
ED7418	0:51f1ef89ec7b	642	*/
ED7418	0:51f1ef89ec7b	643	err_t
ED7418	0:51f1ef89ec7b	644	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
ED7418	0:51f1ef89ec7b	645	tcp_connected_fn connected)
ED7418	0:51f1ef89ec7b	646	{
ED7418	0:51f1ef89ec7b	647	err_t ret;
ED7418	0:51f1ef89ec7b	648	u32_t iss;
ED7418	0:51f1ef89ec7b	649
ED7418	0:51f1ef89ec7b	650	LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
ED7418	0:51f1ef89ec7b	651
ED7418	0:51f1ef89ec7b	652	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
ED7418	0:51f1ef89ec7b	653	if (ipaddr != NULL) {
ED7418	0:51f1ef89ec7b	654	pcb->remote_ip = *ipaddr;
ED7418	0:51f1ef89ec7b	655	} else {
ED7418	0:51f1ef89ec7b	656	return ERR_VAL;
ED7418	0:51f1ef89ec7b	657	}
ED7418	0:51f1ef89ec7b	658	pcb->remote_port = port;
ED7418	0:51f1ef89ec7b	659
ED7418	0:51f1ef89ec7b	660	/* check if we have a route to the remote host */
ED7418	0:51f1ef89ec7b	661	if (ip_addr_isany(&(pcb->local_ip))) {
ED7418	0:51f1ef89ec7b	662	/* no local IP address set, yet. */
ED7418	0:51f1ef89ec7b	663	struct netif *netif = ip_route(&(pcb->remote_ip));
ED7418	0:51f1ef89ec7b	664	if (netif == NULL) {
ED7418	0:51f1ef89ec7b	665	/* Don't even try to send a SYN packet if we have no route
ED7418	0:51f1ef89ec7b	666	since that will fail. */
ED7418	0:51f1ef89ec7b	667	return ERR_RTE;
ED7418	0:51f1ef89ec7b	668	}
ED7418	0:51f1ef89ec7b	669	/* Use the netif's IP address as local address. */
ED7418	0:51f1ef89ec7b	670	ip_addr_copy(pcb->local_ip, netif->ip_addr);
ED7418	0:51f1ef89ec7b	671	}
ED7418	0:51f1ef89ec7b	672
ED7418	0:51f1ef89ec7b	673	if (pcb->local_port == 0) {
ED7418	0:51f1ef89ec7b	674	pcb->local_port = tcp_new_port();
ED7418	0:51f1ef89ec7b	675	}
ED7418	0:51f1ef89ec7b	676	#if SO_REUSE
ED7418	0:51f1ef89ec7b	677	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
ED7418	0:51f1ef89ec7b	678	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
ED7418	0:51f1ef89ec7b	679	now that the 5-tuple is unique. */
ED7418	0:51f1ef89ec7b	680	struct tcp_pcb *cpcb;
ED7418	0:51f1ef89ec7b	681	int i;
ED7418	0:51f1ef89ec7b	682	/* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
ED7418	0:51f1ef89ec7b	683	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
ED7418	0:51f1ef89ec7b	684	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
ED7418	0:51f1ef89ec7b	685	if ((cpcb->local_port == pcb->local_port) &&
ED7418	0:51f1ef89ec7b	686	(cpcb->remote_port == port) &&
ED7418	0:51f1ef89ec7b	687	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
ED7418	0:51f1ef89ec7b	688	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
ED7418	0:51f1ef89ec7b	689	/* linux returns EISCONN here, but ERR_USE should be OK for us */
ED7418	0:51f1ef89ec7b	690	return ERR_USE;
ED7418	0:51f1ef89ec7b	691	}
ED7418	0:51f1ef89ec7b	692	}
ED7418	0:51f1ef89ec7b	693	}
ED7418	0:51f1ef89ec7b	694	}
ED7418	0:51f1ef89ec7b	695	#endif /* SO_REUSE */
ED7418	0:51f1ef89ec7b	696	iss = tcp_next_iss();
ED7418	0:51f1ef89ec7b	697	pcb->rcv_nxt = 0;
ED7418	0:51f1ef89ec7b	698	pcb->snd_nxt = iss;
ED7418	0:51f1ef89ec7b	699	pcb->lastack = iss - 1;
ED7418	0:51f1ef89ec7b	700	pcb->snd_lbb = iss - 1;
ED7418	0:51f1ef89ec7b	701	pcb->rcv_wnd = TCP_WND;
ED7418	0:51f1ef89ec7b	702	pcb->rcv_ann_wnd = TCP_WND;
ED7418	0:51f1ef89ec7b	703	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
ED7418	0:51f1ef89ec7b	704	pcb->snd_wnd = TCP_WND;
ED7418	0:51f1ef89ec7b	705	/* As initial send MSS, we use TCP_MSS but limit it to 536.
ED7418	0:51f1ef89ec7b	706	The send MSS is updated when an MSS option is received. */
ED7418	0:51f1ef89ec7b	707	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
ED7418	0:51f1ef89ec7b	708	#if TCP_CALCULATE_EFF_SEND_MSS
ED7418	0:51f1ef89ec7b	709	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
ED7418	0:51f1ef89ec7b	710	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
ED7418	0:51f1ef89ec7b	711	pcb->cwnd = 1;
ED7418	0:51f1ef89ec7b	712	pcb->ssthresh = pcb->mss * 10;
ED7418	0:51f1ef89ec7b	713	#if LWIP_CALLBACK_API
ED7418	0:51f1ef89ec7b	714	pcb->connected = connected;
ED7418	0:51f1ef89ec7b	715	#else /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	716	LWIP_UNUSED_ARG(connected);
ED7418	0:51f1ef89ec7b	717	#endif /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	718
ED7418	0:51f1ef89ec7b	719	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
ED7418	0:51f1ef89ec7b	720
ED7418	0:51f1ef89ec7b	721	/* Send a SYN together with the MSS option. */
ED7418	0:51f1ef89ec7b	722	ret = tcp_enqueue_flags(pcb, TCP_SYN);
ED7418	0:51f1ef89ec7b	723	if (ret == ERR_OK) {
ED7418	0:51f1ef89ec7b	724	/* SYN segment was enqueued, changed the pcbs state now */
ED7418	0:51f1ef89ec7b	725	pcb->state = SYN_SENT;
ED7418	0:51f1ef89ec7b	726	TCP_RMV(&tcp_bound_pcbs, pcb);
ED7418	0:51f1ef89ec7b	727	TCP_REG(&tcp_active_pcbs, pcb);
ED7418	0:51f1ef89ec7b	728	snmp_inc_tcpactiveopens();
ED7418	0:51f1ef89ec7b	729
ED7418	0:51f1ef89ec7b	730	tcp_output(pcb);
ED7418	0:51f1ef89ec7b	731	}
ED7418	0:51f1ef89ec7b	732	return ret;
ED7418	0:51f1ef89ec7b	733	}
ED7418	0:51f1ef89ec7b	734
ED7418	0:51f1ef89ec7b	735	/**
ED7418	0:51f1ef89ec7b	736	* Called every 500 ms and implements the retransmission timer and the timer that
ED7418	0:51f1ef89ec7b	737	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
ED7418	0:51f1ef89ec7b	738	* various timers such as the inactivity timer in each PCB.
ED7418	0:51f1ef89ec7b	739	*
ED7418	0:51f1ef89ec7b	740	* Automatically called from tcp_tmr().
ED7418	0:51f1ef89ec7b	741	*/
ED7418	0:51f1ef89ec7b	742	void
ED7418	0:51f1ef89ec7b	743	tcp_slowtmr(void)
ED7418	0:51f1ef89ec7b	744	{
ED7418	0:51f1ef89ec7b	745	struct tcp_pcb pcb, pcb2, *prev;
ED7418	0:51f1ef89ec7b	746	u16_t eff_wnd;
ED7418	0:51f1ef89ec7b	747	u8_t pcb_remove; /* flag if a PCB should be removed */
ED7418	0:51f1ef89ec7b	748	u8_t pcb_reset; /* flag if a RST should be sent when removing */
ED7418	0:51f1ef89ec7b	749	err_t err;
ED7418	0:51f1ef89ec7b	750
ED7418	0:51f1ef89ec7b	751	tcp_debug_print_pcbs(); //DG
ED7418	0:51f1ef89ec7b	752
ED7418	0:51f1ef89ec7b	753	err = ERR_OK;
ED7418	0:51f1ef89ec7b	754
ED7418	0:51f1ef89ec7b	755	++tcp_ticks;
ED7418	0:51f1ef89ec7b	756	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
ED7418	0:51f1ef89ec7b	757
ED7418	0:51f1ef89ec7b	758	/* Steps through all of the active PCBs. */
ED7418	0:51f1ef89ec7b	759	prev = NULL;
ED7418	0:51f1ef89ec7b	760	pcb = tcp_active_pcbs;
ED7418	0:51f1ef89ec7b	761	if (pcb == NULL) {
ED7418	0:51f1ef89ec7b	762	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
ED7418	0:51f1ef89ec7b	763	}
ED7418	0:51f1ef89ec7b	764	while (pcb != NULL) {
ED7418	0:51f1ef89ec7b	765	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
ED7418	0:51f1ef89ec7b	766	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
ED7418	0:51f1ef89ec7b	767	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
ED7418	0:51f1ef89ec7b	768	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
ED7418	0:51f1ef89ec7b	769
ED7418	0:51f1ef89ec7b	770	pcb_remove = 0;
ED7418	0:51f1ef89ec7b	771	pcb_reset = 0;
ED7418	0:51f1ef89ec7b	772
ED7418	0:51f1ef89ec7b	773	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
ED7418	0:51f1ef89ec7b	774	++pcb_remove;
ED7418	0:51f1ef89ec7b	775	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
ED7418	0:51f1ef89ec7b	776	}
ED7418	0:51f1ef89ec7b	777	else if (pcb->nrtx == TCP_MAXRTX) {
ED7418	0:51f1ef89ec7b	778	++pcb_remove;
ED7418	0:51f1ef89ec7b	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
ED7418	0:51f1ef89ec7b	780	} else {
ED7418	0:51f1ef89ec7b	781	if (pcb->persist_backoff > 0) {
ED7418	0:51f1ef89ec7b	782	/* If snd_wnd is zero, use persist timer to send 1 byte probes
ED7418	0:51f1ef89ec7b	783	* instead of using the standard retransmission mechanism. */
ED7418	0:51f1ef89ec7b	784	pcb->persist_cnt++;
ED7418	0:51f1ef89ec7b	785	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
ED7418	0:51f1ef89ec7b	786	pcb->persist_cnt = 0;
ED7418	0:51f1ef89ec7b	787	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
ED7418	0:51f1ef89ec7b	788	pcb->persist_backoff++;
ED7418	0:51f1ef89ec7b	789	}
ED7418	0:51f1ef89ec7b	790	tcp_zero_window_probe(pcb);
ED7418	0:51f1ef89ec7b	791	}
ED7418	0:51f1ef89ec7b	792	} else {
ED7418	0:51f1ef89ec7b	793	/* Increase the retransmission timer if it is running */
ED7418	0:51f1ef89ec7b	794	if(pcb->rtime >= 0)
ED7418	0:51f1ef89ec7b	795	++pcb->rtime;
ED7418	0:51f1ef89ec7b	796
ED7418	0:51f1ef89ec7b	797	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
ED7418	0:51f1ef89ec7b	798	/* Time for a retransmission. */
ED7418	0:51f1ef89ec7b	799	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
ED7418	0:51f1ef89ec7b	800	" pcb->rto %"S16_F"\n",
ED7418	0:51f1ef89ec7b	801	pcb->rtime, pcb->rto));
ED7418	0:51f1ef89ec7b	802
ED7418	0:51f1ef89ec7b	803	/* Double retransmission time-out unless we are trying to
ED7418	0:51f1ef89ec7b	804	* connect to somebody (i.e., we are in SYN_SENT). */
ED7418	0:51f1ef89ec7b	805	if (pcb->state != SYN_SENT) {
ED7418	0:51f1ef89ec7b	806	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
ED7418	0:51f1ef89ec7b	807	}
ED7418	0:51f1ef89ec7b	808
ED7418	0:51f1ef89ec7b	809	/* Reset the retransmission timer. */
ED7418	0:51f1ef89ec7b	810	pcb->rtime = 0;
ED7418	0:51f1ef89ec7b	811
ED7418	0:51f1ef89ec7b	812	/* Reduce congestion window and ssthresh. */
ED7418	0:51f1ef89ec7b	813	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
ED7418	0:51f1ef89ec7b	814	pcb->ssthresh = eff_wnd >> 1;
ED7418	0:51f1ef89ec7b	815	if (pcb->ssthresh < (pcb->mss << 1)) {
ED7418	0:51f1ef89ec7b	816	pcb->ssthresh = (pcb->mss << 1);
ED7418	0:51f1ef89ec7b	817	}
ED7418	0:51f1ef89ec7b	818	pcb->cwnd = pcb->mss;
ED7418	0:51f1ef89ec7b	819	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
ED7418	0:51f1ef89ec7b	820	" ssthresh %"U16_F"\n",
ED7418	0:51f1ef89ec7b	821	pcb->cwnd, pcb->ssthresh));
ED7418	0:51f1ef89ec7b	822
ED7418	0:51f1ef89ec7b	823	/* The following needs to be called AFTER cwnd is set to one
ED7418	0:51f1ef89ec7b	824	mss - STJ */
ED7418	0:51f1ef89ec7b	825	tcp_rexmit_rto(pcb);
ED7418	0:51f1ef89ec7b	826	}
ED7418	0:51f1ef89ec7b	827	}
ED7418	0:51f1ef89ec7b	828	}
ED7418	0:51f1ef89ec7b	829	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
ED7418	0:51f1ef89ec7b	830	if (pcb->state == FIN_WAIT_2) {
ED7418	0:51f1ef89ec7b	831	if ((u32_t)(tcp_ticks - pcb->tmr) >
ED7418	0:51f1ef89ec7b	832	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
ED7418	0:51f1ef89ec7b	833	++pcb_remove;
ED7418	0:51f1ef89ec7b	834	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
ED7418	0:51f1ef89ec7b	835	}
ED7418	0:51f1ef89ec7b	836	}
ED7418	0:51f1ef89ec7b	837
ED7418	0:51f1ef89ec7b	838	/* Check if KEEPALIVE should be sent */
ED7418	0:51f1ef89ec7b	839	if((pcb->so_options & SOF_KEEPALIVE) &&
ED7418	0:51f1ef89ec7b	840	((pcb->state == ESTABLISHED) \|\|
ED7418	0:51f1ef89ec7b	841	(pcb->state == CLOSE_WAIT))) {
ED7418	0:51f1ef89ec7b	842	#if LWIP_TCP_KEEPALIVE
ED7418	0:51f1ef89ec7b	843	if((u32_t)(tcp_ticks - pcb->tmr) >
ED7418	0:51f1ef89ec7b	844	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
ED7418	0:51f1ef89ec7b	845	/ TCP_SLOW_INTERVAL)
ED7418	0:51f1ef89ec7b	846	#else
ED7418	0:51f1ef89ec7b	847	if((u32_t)(tcp_ticks - pcb->tmr) >
ED7418	0:51f1ef89ec7b	848	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
ED7418	0:51f1ef89ec7b	849	#endif /* LWIP_TCP_KEEPALIVE */
ED7418	0:51f1ef89ec7b	850	{
ED7418	0:51f1ef89ec7b	851	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
ED7418	0:51f1ef89ec7b	852	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
ED7418	0:51f1ef89ec7b	853	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
ED7418	0:51f1ef89ec7b	854
ED7418	0:51f1ef89ec7b	855	++pcb_remove;
ED7418	0:51f1ef89ec7b	856	++pcb_reset;
ED7418	0:51f1ef89ec7b	857	}
ED7418	0:51f1ef89ec7b	858	#if LWIP_TCP_KEEPALIVE
ED7418	0:51f1ef89ec7b	859	else if((u32_t)(tcp_ticks - pcb->tmr) >
ED7418	0:51f1ef89ec7b	860	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
ED7418	0:51f1ef89ec7b	861	/ TCP_SLOW_INTERVAL)
ED7418	0:51f1ef89ec7b	862	#else
ED7418	0:51f1ef89ec7b	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
ED7418	0:51f1ef89ec7b	864	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
ED7418	0:51f1ef89ec7b	865	/ TCP_SLOW_INTERVAL)
ED7418	0:51f1ef89ec7b	866	#endif /* LWIP_TCP_KEEPALIVE */
ED7418	0:51f1ef89ec7b	867	{
ED7418	0:51f1ef89ec7b	868	tcp_keepalive(pcb);
ED7418	0:51f1ef89ec7b	869	pcb->keep_cnt_sent++;
ED7418	0:51f1ef89ec7b	870	}
ED7418	0:51f1ef89ec7b	871	}
ED7418	0:51f1ef89ec7b	872
ED7418	0:51f1ef89ec7b	873	/* If this PCB has queued out of sequence data, but has been
ED7418	0:51f1ef89ec7b	874	inactive for too long, will drop the data (it will eventually
ED7418	0:51f1ef89ec7b	875	be retransmitted). */
ED7418	0:51f1ef89ec7b	876	#if TCP_QUEUE_OOSEQ
ED7418	0:51f1ef89ec7b	877	if (pcb->ooseq != NULL &&
ED7418	0:51f1ef89ec7b	878	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
ED7418	0:51f1ef89ec7b	879	tcp_segs_free(pcb->ooseq);
ED7418	0:51f1ef89ec7b	880	pcb->ooseq = NULL;
ED7418	0:51f1ef89ec7b	881	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
ED7418	0:51f1ef89ec7b	882	}
ED7418	0:51f1ef89ec7b	883	#endif /* TCP_QUEUE_OOSEQ */
ED7418	0:51f1ef89ec7b	884
ED7418	0:51f1ef89ec7b	885	/* Check if this PCB has stayed too long in SYN-RCVD */
ED7418	0:51f1ef89ec7b	886	if (pcb->state == SYN_RCVD) {
ED7418	0:51f1ef89ec7b	887	if ((u32_t)(tcp_ticks - pcb->tmr) >
ED7418	0:51f1ef89ec7b	888	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
ED7418	0:51f1ef89ec7b	889	++pcb_remove;
ED7418	0:51f1ef89ec7b	890	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
ED7418	0:51f1ef89ec7b	891	}
ED7418	0:51f1ef89ec7b	892	}
ED7418	0:51f1ef89ec7b	893
ED7418	0:51f1ef89ec7b	894	/* Check if this PCB has stayed too long in LAST-ACK */
ED7418	0:51f1ef89ec7b	895	if (pcb->state == LAST_ACK) {
ED7418	0:51f1ef89ec7b	896	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
ED7418	0:51f1ef89ec7b	897	++pcb_remove;
ED7418	0:51f1ef89ec7b	898	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
ED7418	0:51f1ef89ec7b	899	}
ED7418	0:51f1ef89ec7b	900	}
ED7418	0:51f1ef89ec7b	901
ED7418	0:51f1ef89ec7b	902	/* If the PCB should be removed, do it. */
ED7418	0:51f1ef89ec7b	903	if (pcb_remove) {
ED7418	0:51f1ef89ec7b	904	tcp_pcb_purge(pcb);
ED7418	0:51f1ef89ec7b	905	/* Remove PCB from tcp_active_pcbs list. */
ED7418	0:51f1ef89ec7b	906	if (prev != NULL) {
ED7418	0:51f1ef89ec7b	907	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
ED7418	0:51f1ef89ec7b	908	prev->next = pcb->next;
ED7418	0:51f1ef89ec7b	909	} else {
ED7418	0:51f1ef89ec7b	910	/* This PCB was the first. */
ED7418	0:51f1ef89ec7b	911	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
ED7418	0:51f1ef89ec7b	912	tcp_active_pcbs = pcb->next;
ED7418	0:51f1ef89ec7b	913	}
ED7418	0:51f1ef89ec7b	914
ED7418	0:51f1ef89ec7b	915	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
ED7418	0:51f1ef89ec7b	916	if (pcb_reset) {
ED7418	0:51f1ef89ec7b	917	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
ED7418	0:51f1ef89ec7b	918	pcb->local_port, pcb->remote_port);
ED7418	0:51f1ef89ec7b	919	}
ED7418	0:51f1ef89ec7b	920
ED7418	0:51f1ef89ec7b	921	pcb2 = pcb->next;
ED7418	0:51f1ef89ec7b	922	memp_free(MEMP_TCP_PCB, pcb);
ED7418	0:51f1ef89ec7b	923	pcb = pcb2;
ED7418	0:51f1ef89ec7b	924	} else {
ED7418	0:51f1ef89ec7b	925	/* get the 'next' element now and work with 'prev' below (in case of abort) */
ED7418	0:51f1ef89ec7b	926	prev = pcb;
ED7418	0:51f1ef89ec7b	927	pcb = pcb->next;
ED7418	0:51f1ef89ec7b	928
ED7418	0:51f1ef89ec7b	929	/* We check if we should poll the connection. */
ED7418	0:51f1ef89ec7b	930	++prev->polltmr;
ED7418	0:51f1ef89ec7b	931	if (prev->polltmr >= prev->pollinterval) {
ED7418	0:51f1ef89ec7b	932	prev->polltmr = 0;
ED7418	0:51f1ef89ec7b	933	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
ED7418	0:51f1ef89ec7b	934	TCP_EVENT_POLL(prev, err);
ED7418	0:51f1ef89ec7b	935	/* if err == ERR_ABRT, 'prev' is already deallocated */
ED7418	0:51f1ef89ec7b	936	if (err == ERR_OK) {
ED7418	0:51f1ef89ec7b	937	tcp_output(prev);
ED7418	0:51f1ef89ec7b	938	}
ED7418	0:51f1ef89ec7b	939	}
ED7418	0:51f1ef89ec7b	940	}
ED7418	0:51f1ef89ec7b	941	}
ED7418	0:51f1ef89ec7b	942
ED7418	0:51f1ef89ec7b	943
ED7418	0:51f1ef89ec7b	944	/* Steps through all of the TIME-WAIT PCBs. */
ED7418	0:51f1ef89ec7b	945	prev = NULL;
ED7418	0:51f1ef89ec7b	946	pcb = tcp_tw_pcbs;
ED7418	0:51f1ef89ec7b	947	while (pcb != NULL) {
ED7418	0:51f1ef89ec7b	948	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
ED7418	0:51f1ef89ec7b	949	pcb_remove = 0;
ED7418	0:51f1ef89ec7b	950
ED7418	0:51f1ef89ec7b	951	/* Check if this PCB has stayed long enough in TIME-WAIT */
ED7418	0:51f1ef89ec7b	952	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
ED7418	0:51f1ef89ec7b	953	++pcb_remove;
ED7418	0:51f1ef89ec7b	954	}
ED7418	0:51f1ef89ec7b	955
ED7418	0:51f1ef89ec7b	956
ED7418	0:51f1ef89ec7b	957
ED7418	0:51f1ef89ec7b	958	/* If the PCB should be removed, do it. */
ED7418	0:51f1ef89ec7b	959	if (pcb_remove) {
ED7418	0:51f1ef89ec7b	960	tcp_pcb_purge(pcb);
ED7418	0:51f1ef89ec7b	961	/* Remove PCB from tcp_tw_pcbs list. */
ED7418	0:51f1ef89ec7b	962	if (prev != NULL) {
ED7418	0:51f1ef89ec7b	963	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
ED7418	0:51f1ef89ec7b	964	prev->next = pcb->next;
ED7418	0:51f1ef89ec7b	965	} else {
ED7418	0:51f1ef89ec7b	966	/* This PCB was the first. */
ED7418	0:51f1ef89ec7b	967	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
ED7418	0:51f1ef89ec7b	968	tcp_tw_pcbs = pcb->next;
ED7418	0:51f1ef89ec7b	969	}
ED7418	0:51f1ef89ec7b	970	pcb2 = pcb->next;
ED7418	0:51f1ef89ec7b	971	memp_free(MEMP_TCP_PCB, pcb);
ED7418	0:51f1ef89ec7b	972	pcb = pcb2;
ED7418	0:51f1ef89ec7b	973	} else {
ED7418	0:51f1ef89ec7b	974	prev = pcb;
ED7418	0:51f1ef89ec7b	975	pcb = pcb->next;
ED7418	0:51f1ef89ec7b	976	}
ED7418	0:51f1ef89ec7b	977	}
ED7418	0:51f1ef89ec7b	978	}
ED7418	0:51f1ef89ec7b	979
ED7418	0:51f1ef89ec7b	980	/**
ED7418	0:51f1ef89ec7b	981	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
ED7418	0:51f1ef89ec7b	982	* "refused" by upper layer (application) and sends delayed ACKs.
ED7418	0:51f1ef89ec7b	983	*
ED7418	0:51f1ef89ec7b	984	* Automatically called from tcp_tmr().
ED7418	0:51f1ef89ec7b	985	*/
ED7418	0:51f1ef89ec7b	986	void
ED7418	0:51f1ef89ec7b	987	tcp_fasttmr(void)
ED7418	0:51f1ef89ec7b	988	{
ED7418	0:51f1ef89ec7b	989	struct tcp_pcb *pcb = tcp_active_pcbs;
ED7418	0:51f1ef89ec7b	990
ED7418	0:51f1ef89ec7b	991	while(pcb != NULL) {
ED7418	0:51f1ef89ec7b	992	struct tcp_pcb *next = pcb->next;
ED7418	0:51f1ef89ec7b	993	/* If there is data which was previously "refused" by upper layer */
ED7418	0:51f1ef89ec7b	994	if (pcb->refused_data != NULL) {
ED7418	0:51f1ef89ec7b	995	/* Notify again application with data previously received. */
ED7418	0:51f1ef89ec7b	996	err_t err;
ED7418	0:51f1ef89ec7b	997	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
ED7418	0:51f1ef89ec7b	998	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
ED7418	0:51f1ef89ec7b	999	if (err == ERR_OK) {
ED7418	0:51f1ef89ec7b	1000	pcb->refused_data = NULL;
ED7418	0:51f1ef89ec7b	1001	} else if (err == ERR_ABRT) {
ED7418	0:51f1ef89ec7b	1002	/* if err == ERR_ABRT, 'pcb' is already deallocated */
ED7418	0:51f1ef89ec7b	1003	pcb = NULL;
ED7418	0:51f1ef89ec7b	1004	}
ED7418	0:51f1ef89ec7b	1005	}
ED7418	0:51f1ef89ec7b	1006
ED7418	0:51f1ef89ec7b	1007	/* send delayed ACKs */
ED7418	0:51f1ef89ec7b	1008	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
ED7418	0:51f1ef89ec7b	1009	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
ED7418	0:51f1ef89ec7b	1010	tcp_ack_now(pcb);
ED7418	0:51f1ef89ec7b	1011	tcp_output(pcb);
ED7418	0:51f1ef89ec7b	1012	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
ED7418	0:51f1ef89ec7b	1013	}
ED7418	0:51f1ef89ec7b	1014
ED7418	0:51f1ef89ec7b	1015	pcb = next;
ED7418	0:51f1ef89ec7b	1016	}
ED7418	0:51f1ef89ec7b	1017	}
ED7418	0:51f1ef89ec7b	1018
ED7418	0:51f1ef89ec7b	1019	/**
ED7418	0:51f1ef89ec7b	1020	* Deallocates a list of TCP segments (tcp_seg structures).
ED7418	0:51f1ef89ec7b	1021	*
ED7418	0:51f1ef89ec7b	1022	* @param seg tcp_seg list of TCP segments to free
ED7418	0:51f1ef89ec7b	1023	*/
ED7418	0:51f1ef89ec7b	1024	void
ED7418	0:51f1ef89ec7b	1025	tcp_segs_free(struct tcp_seg *seg)
ED7418	0:51f1ef89ec7b	1026	{
ED7418	0:51f1ef89ec7b	1027	while (seg != NULL) {
ED7418	0:51f1ef89ec7b	1028	struct tcp_seg *next = seg->next;
ED7418	0:51f1ef89ec7b	1029	tcp_seg_free(seg);
ED7418	0:51f1ef89ec7b	1030	seg = next;
ED7418	0:51f1ef89ec7b	1031	}
ED7418	0:51f1ef89ec7b	1032	}
ED7418	0:51f1ef89ec7b	1033
ED7418	0:51f1ef89ec7b	1034	/**
ED7418	0:51f1ef89ec7b	1035	* Frees a TCP segment (tcp_seg structure).
ED7418	0:51f1ef89ec7b	1036	*
ED7418	0:51f1ef89ec7b	1037	* @param seg single tcp_seg to free
ED7418	0:51f1ef89ec7b	1038	*/
ED7418	0:51f1ef89ec7b	1039	void
ED7418	0:51f1ef89ec7b	1040	tcp_seg_free(struct tcp_seg *seg)
ED7418	0:51f1ef89ec7b	1041	{
ED7418	0:51f1ef89ec7b	1042	if (seg != NULL) {
ED7418	0:51f1ef89ec7b	1043	if (seg->p != NULL) {
ED7418	0:51f1ef89ec7b	1044	pbuf_free(seg->p);
ED7418	0:51f1ef89ec7b	1045	#if TCP_DEBUG
ED7418	0:51f1ef89ec7b	1046	seg->p = NULL;
ED7418	0:51f1ef89ec7b	1047	#endif /* TCP_DEBUG */
ED7418	0:51f1ef89ec7b	1048	}
ED7418	0:51f1ef89ec7b	1049	memp_free(MEMP_TCP_SEG, seg);
ED7418	0:51f1ef89ec7b	1050	}
ED7418	0:51f1ef89ec7b	1051	}
ED7418	0:51f1ef89ec7b	1052
ED7418	0:51f1ef89ec7b	1053	/**
ED7418	0:51f1ef89ec7b	1054	* Sets the priority of a connection.
ED7418	0:51f1ef89ec7b	1055	*
ED7418	0:51f1ef89ec7b	1056	* @param pcb the tcp_pcb to manipulate
ED7418	0:51f1ef89ec7b	1057	* @param prio new priority
ED7418	0:51f1ef89ec7b	1058	*/
ED7418	0:51f1ef89ec7b	1059	void
ED7418	0:51f1ef89ec7b	1060	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
ED7418	0:51f1ef89ec7b	1061	{
ED7418	0:51f1ef89ec7b	1062	pcb->prio = prio;
ED7418	0:51f1ef89ec7b	1063	}
ED7418	0:51f1ef89ec7b	1064
ED7418	0:51f1ef89ec7b	1065	#if TCP_QUEUE_OOSEQ
ED7418	0:51f1ef89ec7b	1066	/**
ED7418	0:51f1ef89ec7b	1067	* Returns a copy of the given TCP segment.
ED7418	0:51f1ef89ec7b	1068	* The pbuf and data are not copied, only the pointers
ED7418	0:51f1ef89ec7b	1069	*
ED7418	0:51f1ef89ec7b	1070	* @param seg the old tcp_seg
ED7418	0:51f1ef89ec7b	1071	* @return a copy of seg
ED7418	0:51f1ef89ec7b	1072	*/
ED7418	0:51f1ef89ec7b	1073	struct tcp_seg *
ED7418	0:51f1ef89ec7b	1074	tcp_seg_copy(struct tcp_seg *seg)
ED7418	0:51f1ef89ec7b	1075	{
ED7418	0:51f1ef89ec7b	1076	struct tcp_seg *cseg;
ED7418	0:51f1ef89ec7b	1077
ED7418	0:51f1ef89ec7b	1078	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
ED7418	0:51f1ef89ec7b	1079	if (cseg == NULL) {
ED7418	0:51f1ef89ec7b	1080	return NULL;
ED7418	0:51f1ef89ec7b	1081	}
ED7418	0:51f1ef89ec7b	1082	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
ED7418	0:51f1ef89ec7b	1083	pbuf_ref(cseg->p);
ED7418	0:51f1ef89ec7b	1084	return cseg;
ED7418	0:51f1ef89ec7b	1085	}
ED7418	0:51f1ef89ec7b	1086	#endif /* TCP_QUEUE_OOSEQ */
ED7418	0:51f1ef89ec7b	1087
ED7418	0:51f1ef89ec7b	1088	#if LWIP_CALLBACK_API
ED7418	0:51f1ef89ec7b	1089	/**
ED7418	0:51f1ef89ec7b	1090	* Default receive callback that is called if the user didn't register
ED7418	0:51f1ef89ec7b	1091	* a recv callback for the pcb.
ED7418	0:51f1ef89ec7b	1092	*/
ED7418	0:51f1ef89ec7b	1093	err_t
ED7418	0:51f1ef89ec7b	1094	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
ED7418	0:51f1ef89ec7b	1095	{
ED7418	0:51f1ef89ec7b	1096	LWIP_UNUSED_ARG(arg);
ED7418	0:51f1ef89ec7b	1097	if (p != NULL) {
ED7418	0:51f1ef89ec7b	1098	tcp_recved(pcb, p->tot_len);
ED7418	0:51f1ef89ec7b	1099	pbuf_free(p);
ED7418	0:51f1ef89ec7b	1100	} else if (err == ERR_OK) {
ED7418	0:51f1ef89ec7b	1101	return tcp_close(pcb);
ED7418	0:51f1ef89ec7b	1102	}
ED7418	0:51f1ef89ec7b	1103	return ERR_OK;
ED7418	0:51f1ef89ec7b	1104	}
ED7418	0:51f1ef89ec7b	1105	#endif /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	1106
ED7418	0:51f1ef89ec7b	1107	/**
ED7418	0:51f1ef89ec7b	1108	* Kills the oldest active connection that has lower priority than prio.
ED7418	0:51f1ef89ec7b	1109	*
ED7418	0:51f1ef89ec7b	1110	* @param prio minimum priority
ED7418	0:51f1ef89ec7b	1111	*/
ED7418	0:51f1ef89ec7b	1112	static void
ED7418	0:51f1ef89ec7b	1113	tcp_kill_prio(u8_t prio)
ED7418	0:51f1ef89ec7b	1114	{
ED7418	0:51f1ef89ec7b	1115	struct tcp_pcb pcb, inactive;
ED7418	0:51f1ef89ec7b	1116	u32_t inactivity;
ED7418	0:51f1ef89ec7b	1117	u8_t mprio;
ED7418	0:51f1ef89ec7b	1118
ED7418	0:51f1ef89ec7b	1119
ED7418	0:51f1ef89ec7b	1120	mprio = TCP_PRIO_MAX;
ED7418	0:51f1ef89ec7b	1121
ED7418	0:51f1ef89ec7b	1122	/* We kill the oldest active connection that has lower priority than prio. */
ED7418	0:51f1ef89ec7b	1123	inactivity = 0;
ED7418	0:51f1ef89ec7b	1124	inactive = NULL;
ED7418	0:51f1ef89ec7b	1125	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
ED7418	0:51f1ef89ec7b	1126	if (pcb->prio <= prio &&
ED7418	0:51f1ef89ec7b	1127	pcb->prio <= mprio &&
ED7418	0:51f1ef89ec7b	1128	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
ED7418	0:51f1ef89ec7b	1129	inactivity = tcp_ticks - pcb->tmr;
ED7418	0:51f1ef89ec7b	1130	inactive = pcb;
ED7418	0:51f1ef89ec7b	1131	mprio = pcb->prio;
ED7418	0:51f1ef89ec7b	1132	}
ED7418	0:51f1ef89ec7b	1133	}
ED7418	0:51f1ef89ec7b	1134	if (inactive != NULL) {
ED7418	0:51f1ef89ec7b	1135	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
ED7418	0:51f1ef89ec7b	1136	(void *)inactive, inactivity));
ED7418	0:51f1ef89ec7b	1137	tcp_abort(inactive);
ED7418	0:51f1ef89ec7b	1138	}
ED7418	0:51f1ef89ec7b	1139	}
ED7418	0:51f1ef89ec7b	1140
ED7418	0:51f1ef89ec7b	1141	/**
ED7418	0:51f1ef89ec7b	1142	* Kills the oldest connection that is in TIME_WAIT state.
ED7418	0:51f1ef89ec7b	1143	* Called from tcp_alloc() if no more connections are available.
ED7418	0:51f1ef89ec7b	1144	*/
ED7418	0:51f1ef89ec7b	1145	static void
ED7418	0:51f1ef89ec7b	1146	tcp_kill_timewait(void)
ED7418	0:51f1ef89ec7b	1147	{
ED7418	0:51f1ef89ec7b	1148	struct tcp_pcb pcb, inactive;
ED7418	0:51f1ef89ec7b	1149	u32_t inactivity;
ED7418	0:51f1ef89ec7b	1150
ED7418	0:51f1ef89ec7b	1151	inactivity = 0;
ED7418	0:51f1ef89ec7b	1152	inactive = NULL;
ED7418	0:51f1ef89ec7b	1153	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
ED7418	0:51f1ef89ec7b	1154	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
ED7418	0:51f1ef89ec7b	1155	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
ED7418	0:51f1ef89ec7b	1156	inactivity = tcp_ticks - pcb->tmr;
ED7418	0:51f1ef89ec7b	1157	inactive = pcb;
ED7418	0:51f1ef89ec7b	1158	}
ED7418	0:51f1ef89ec7b	1159	}
ED7418	0:51f1ef89ec7b	1160	if (inactive != NULL) {
ED7418	0:51f1ef89ec7b	1161	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
ED7418	0:51f1ef89ec7b	1162	(void *)inactive, inactivity));
ED7418	0:51f1ef89ec7b	1163	tcp_abort(inactive);
ED7418	0:51f1ef89ec7b	1164	}
ED7418	0:51f1ef89ec7b	1165	}
ED7418	0:51f1ef89ec7b	1166
ED7418	0:51f1ef89ec7b	1167	/**
ED7418	0:51f1ef89ec7b	1168	* Allocate a new tcp_pcb structure.
ED7418	0:51f1ef89ec7b	1169	*
ED7418	0:51f1ef89ec7b	1170	* @param prio priority for the new pcb
ED7418	0:51f1ef89ec7b	1171	* @return a new tcp_pcb that initially is in state CLOSED
ED7418	0:51f1ef89ec7b	1172	*/
ED7418	0:51f1ef89ec7b	1173	struct tcp_pcb *
ED7418	0:51f1ef89ec7b	1174	tcp_alloc(u8_t prio)
ED7418	0:51f1ef89ec7b	1175	{
ED7418	0:51f1ef89ec7b	1176	struct tcp_pcb *pcb;
ED7418	0:51f1ef89ec7b	1177	u32_t iss;
ED7418	0:51f1ef89ec7b	1178
ED7418	0:51f1ef89ec7b	1179	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
ED7418	0:51f1ef89ec7b	1180	if (pcb == NULL) {
ED7418	0:51f1ef89ec7b	1181	/* Try killing oldest connection in TIME-WAIT. */
ED7418	0:51f1ef89ec7b	1182	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
ED7418	0:51f1ef89ec7b	1183	tcp_kill_timewait();
ED7418	0:51f1ef89ec7b	1184	/* Try to allocate a tcp_pcb again. */
ED7418	0:51f1ef89ec7b	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
ED7418	0:51f1ef89ec7b	1186	if (pcb == NULL) {
ED7418	0:51f1ef89ec7b	1187	/* Try killing active connections with lower priority than the new one. */
ED7418	0:51f1ef89ec7b	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
ED7418	0:51f1ef89ec7b	1189	tcp_kill_prio(prio);
ED7418	0:51f1ef89ec7b	1190	/* Try to allocate a tcp_pcb again. */
ED7418	0:51f1ef89ec7b	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
ED7418	0:51f1ef89ec7b	1192	if (pcb != NULL) {
ED7418	0:51f1ef89ec7b	1193	/* adjust err stats: memp_malloc failed twice before */
ED7418	0:51f1ef89ec7b	1194	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
ED7418	0:51f1ef89ec7b	1195	}
ED7418	0:51f1ef89ec7b	1196	}
ED7418	0:51f1ef89ec7b	1197	if (pcb != NULL) {
ED7418	0:51f1ef89ec7b	1198	/* adjust err stats: timewait PCB was freed above */
ED7418	0:51f1ef89ec7b	1199	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
ED7418	0:51f1ef89ec7b	1200	}
ED7418	0:51f1ef89ec7b	1201	}
ED7418	0:51f1ef89ec7b	1202	if (pcb != NULL) {
ED7418	0:51f1ef89ec7b	1203	memset(pcb, 0, sizeof(struct tcp_pcb));
ED7418	0:51f1ef89ec7b	1204	pcb->prio = prio;
ED7418	0:51f1ef89ec7b	1205	pcb->snd_buf = TCP_SND_BUF;
ED7418	0:51f1ef89ec7b	1206	pcb->snd_queuelen = 0;
ED7418	0:51f1ef89ec7b	1207	pcb->rcv_wnd = TCP_WND;
ED7418	0:51f1ef89ec7b	1208	pcb->rcv_ann_wnd = TCP_WND;
ED7418	0:51f1ef89ec7b	1209	pcb->tos = 0;
ED7418	0:51f1ef89ec7b	1210	pcb->ttl = TCP_TTL;
ED7418	0:51f1ef89ec7b	1211	/* As initial send MSS, we use TCP_MSS but limit it to 536.
ED7418	0:51f1ef89ec7b	1212	The send MSS is updated when an MSS option is received. */
ED7418	0:51f1ef89ec7b	1213	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
ED7418	0:51f1ef89ec7b	1214	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
ED7418	0:51f1ef89ec7b	1215	pcb->sa = 0;
ED7418	0:51f1ef89ec7b	1216	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
ED7418	0:51f1ef89ec7b	1217	pcb->rtime = -1;
ED7418	0:51f1ef89ec7b	1218	pcb->cwnd = 1;
ED7418	0:51f1ef89ec7b	1219	iss = tcp_next_iss();
ED7418	0:51f1ef89ec7b	1220	pcb->snd_wl2 = iss;
ED7418	0:51f1ef89ec7b	1221	pcb->snd_nxt = iss;
ED7418	0:51f1ef89ec7b	1222	pcb->lastack = iss;
ED7418	0:51f1ef89ec7b	1223	pcb->snd_lbb = iss;
ED7418	0:51f1ef89ec7b	1224	pcb->tmr = tcp_ticks;
ED7418	0:51f1ef89ec7b	1225
ED7418	0:51f1ef89ec7b	1226	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
ED7418	0:51f1ef89ec7b	1227
ED7418	0:51f1ef89ec7b	1228	pcb->polltmr = 0;
ED7418	0:51f1ef89ec7b	1229
ED7418	0:51f1ef89ec7b	1230	#if LWIP_CALLBACK_API
ED7418	0:51f1ef89ec7b	1231	pcb->recv = tcp_recv_null;
ED7418	0:51f1ef89ec7b	1232	#endif /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	1233
ED7418	0:51f1ef89ec7b	1234	/* Init KEEPALIVE timer */
ED7418	0:51f1ef89ec7b	1235	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
ED7418	0:51f1ef89ec7b	1236
ED7418	0:51f1ef89ec7b	1237	#if LWIP_TCP_KEEPALIVE
ED7418	0:51f1ef89ec7b	1238	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
ED7418	0:51f1ef89ec7b	1239	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
ED7418	0:51f1ef89ec7b	1240	#endif /* LWIP_TCP_KEEPALIVE */
ED7418	0:51f1ef89ec7b	1241
ED7418	0:51f1ef89ec7b	1242	pcb->keep_cnt_sent = 0;
ED7418	0:51f1ef89ec7b	1243	}
ED7418	0:51f1ef89ec7b	1244	return pcb;
ED7418	0:51f1ef89ec7b	1245	}
ED7418	0:51f1ef89ec7b	1246
ED7418	0:51f1ef89ec7b	1247	/**
ED7418	0:51f1ef89ec7b	1248	* Creates a new TCP protocol control block but doesn't place it on
ED7418	0:51f1ef89ec7b	1249	* any of the TCP PCB lists.
ED7418	0:51f1ef89ec7b	1250	* The pcb is not put on any list until binding using tcp_bind().
ED7418	0:51f1ef89ec7b	1251	*
ED7418	0:51f1ef89ec7b	1252	* @internal: Maybe there should be a idle TCP PCB list where these
ED7418	0:51f1ef89ec7b	1253	* PCBs are put on. Port reservation using tcp_bind() is implemented but
ED7418	0:51f1ef89ec7b	1254	* allocated pcbs that are not bound can't be killed automatically if wanting
ED7418	0:51f1ef89ec7b	1255	* to allocate a pcb with higher prio (@see tcp_kill_prio())
ED7418	0:51f1ef89ec7b	1256	*
ED7418	0:51f1ef89ec7b	1257	* @return a new tcp_pcb that initially is in state CLOSED
ED7418	0:51f1ef89ec7b	1258	*/
ED7418	0:51f1ef89ec7b	1259	struct tcp_pcb *
ED7418	0:51f1ef89ec7b	1260	tcp_new(void)
ED7418	0:51f1ef89ec7b	1261	{
ED7418	0:51f1ef89ec7b	1262	return tcp_alloc(TCP_PRIO_NORMAL);
ED7418	0:51f1ef89ec7b	1263	}
ED7418	0:51f1ef89ec7b	1264
ED7418	0:51f1ef89ec7b	1265	/**
ED7418	0:51f1ef89ec7b	1266	* Used to specify the argument that should be passed callback
ED7418	0:51f1ef89ec7b	1267	* functions.
ED7418	0:51f1ef89ec7b	1268	*
ED7418	0:51f1ef89ec7b	1269	* @param pcb tcp_pcb to set the callback argument
ED7418	0:51f1ef89ec7b	1270	* @param arg void pointer argument to pass to callback functions
ED7418	0:51f1ef89ec7b	1271	*/
ED7418	0:51f1ef89ec7b	1272	void
ED7418	0:51f1ef89ec7b	1273	tcp_arg(struct tcp_pcb pcb, void arg)
ED7418	0:51f1ef89ec7b	1274	{
ED7418	0:51f1ef89ec7b	1275	pcb->callback_arg = arg;
ED7418	0:51f1ef89ec7b	1276	}
ED7418	0:51f1ef89ec7b	1277	#if LWIP_CALLBACK_API
ED7418	0:51f1ef89ec7b	1278
ED7418	0:51f1ef89ec7b	1279	/**
ED7418	0:51f1ef89ec7b	1280	* Used to specify the function that should be called when a TCP
ED7418	0:51f1ef89ec7b	1281	* connection receives data.
ED7418	0:51f1ef89ec7b	1282	*
ED7418	0:51f1ef89ec7b	1283	* @param pcb tcp_pcb to set the recv callback
ED7418	0:51f1ef89ec7b	1284	* @param recv callback function to call for this pcb when data is received
ED7418	0:51f1ef89ec7b	1285	*/
ED7418	0:51f1ef89ec7b	1286	void
ED7418	0:51f1ef89ec7b	1287	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
ED7418	0:51f1ef89ec7b	1288	{
ED7418	0:51f1ef89ec7b	1289	pcb->recv = recv;
ED7418	0:51f1ef89ec7b	1290	}
ED7418	0:51f1ef89ec7b	1291
ED7418	0:51f1ef89ec7b	1292	/**
ED7418	0:51f1ef89ec7b	1293	* Used to specify the function that should be called when TCP data
ED7418	0:51f1ef89ec7b	1294	* has been successfully delivered to the remote host.
ED7418	0:51f1ef89ec7b	1295	*
ED7418	0:51f1ef89ec7b	1296	* @param pcb tcp_pcb to set the sent callback
ED7418	0:51f1ef89ec7b	1297	* @param sent callback function to call for this pcb when data is successfully sent
ED7418	0:51f1ef89ec7b	1298	*/
ED7418	0:51f1ef89ec7b	1299	void
ED7418	0:51f1ef89ec7b	1300	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
ED7418	0:51f1ef89ec7b	1301	{
ED7418	0:51f1ef89ec7b	1302	pcb->sent = sent;
ED7418	0:51f1ef89ec7b	1303	}
ED7418	0:51f1ef89ec7b	1304
ED7418	0:51f1ef89ec7b	1305	/**
ED7418	0:51f1ef89ec7b	1306	* Used to specify the function that should be called when a fatal error
ED7418	0:51f1ef89ec7b	1307	* has occured on the connection.
ED7418	0:51f1ef89ec7b	1308	*
ED7418	0:51f1ef89ec7b	1309	* @param pcb tcp_pcb to set the err callback
ED7418	0:51f1ef89ec7b	1310	* @param err callback function to call for this pcb when a fatal error
ED7418	0:51f1ef89ec7b	1311	* has occured on the connection
ED7418	0:51f1ef89ec7b	1312	*/
ED7418	0:51f1ef89ec7b	1313	void
ED7418	0:51f1ef89ec7b	1314	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
ED7418	0:51f1ef89ec7b	1315	{
ED7418	0:51f1ef89ec7b	1316	pcb->errf = err;
ED7418	0:51f1ef89ec7b	1317	}
ED7418	0:51f1ef89ec7b	1318
ED7418	0:51f1ef89ec7b	1319	/**
ED7418	0:51f1ef89ec7b	1320	* Used for specifying the function that should be called when a
ED7418	0:51f1ef89ec7b	1321	* LISTENing connection has been connected to another host.
ED7418	0:51f1ef89ec7b	1322	*
ED7418	0:51f1ef89ec7b	1323	* @param pcb tcp_pcb to set the accept callback
ED7418	0:51f1ef89ec7b	1324	* @param accept callback function to call for this pcb when LISTENing
ED7418	0:51f1ef89ec7b	1325	* connection has been connected to another host
ED7418	0:51f1ef89ec7b	1326	*/
ED7418	0:51f1ef89ec7b	1327	void
ED7418	0:51f1ef89ec7b	1328	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
ED7418	0:51f1ef89ec7b	1329	{
ED7418	0:51f1ef89ec7b	1330	pcb->accept = accept;
ED7418	0:51f1ef89ec7b	1331	}
ED7418	0:51f1ef89ec7b	1332	#endif /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	1333
ED7418	0:51f1ef89ec7b	1334
ED7418	0:51f1ef89ec7b	1335	/**
ED7418	0:51f1ef89ec7b	1336	* Used to specify the function that should be called periodically
ED7418	0:51f1ef89ec7b	1337	* from TCP. The interval is specified in terms of the TCP coarse
ED7418	0:51f1ef89ec7b	1338	* timer interval, which is called twice a second.
ED7418	0:51f1ef89ec7b	1339	*
ED7418	0:51f1ef89ec7b	1340	*/
ED7418	0:51f1ef89ec7b	1341	void
ED7418	0:51f1ef89ec7b	1342	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
ED7418	0:51f1ef89ec7b	1343	{
ED7418	0:51f1ef89ec7b	1344	#if LWIP_CALLBACK_API
ED7418	0:51f1ef89ec7b	1345	pcb->poll = poll;
ED7418	0:51f1ef89ec7b	1346	#else /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	1347	LWIP_UNUSED_ARG(poll);
ED7418	0:51f1ef89ec7b	1348	#endif /* LWIP_CALLBACK_API */
ED7418	0:51f1ef89ec7b	1349	pcb->pollinterval = interval;
ED7418	0:51f1ef89ec7b	1350	}
ED7418	0:51f1ef89ec7b	1351
ED7418	0:51f1ef89ec7b	1352	/**
ED7418	0:51f1ef89ec7b	1353	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
ED7418	0:51f1ef89ec7b	1354	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
ED7418	0:51f1ef89ec7b	1355	*
ED7418	0:51f1ef89ec7b	1356	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
ED7418	0:51f1ef89ec7b	1357	*/
ED7418	0:51f1ef89ec7b	1358	void
ED7418	0:51f1ef89ec7b	1359	tcp_pcb_purge(struct tcp_pcb *pcb)
ED7418	0:51f1ef89ec7b	1360	{
ED7418	0:51f1ef89ec7b	1361	if (pcb->state != CLOSED &&
ED7418	0:51f1ef89ec7b	1362	pcb->state != TIME_WAIT &&
ED7418	0:51f1ef89ec7b	1363	pcb->state != LISTEN) {
ED7418	0:51f1ef89ec7b	1364
ED7418	0:51f1ef89ec7b	1365	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
ED7418	0:51f1ef89ec7b	1366
ED7418	0:51f1ef89ec7b	1367	#if TCP_LISTEN_BACKLOG
ED7418	0:51f1ef89ec7b	1368	if (pcb->state == SYN_RCVD) {
ED7418	0:51f1ef89ec7b	1369	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
ED7418	0:51f1ef89ec7b	1370	struct tcp_pcb_listen *lpcb;
ED7418	0:51f1ef89ec7b	1371	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
ED7418	0:51f1ef89ec7b	1372	tcp_listen_pcbs.listen_pcbs != NULL);
ED7418	0:51f1ef89ec7b	1373	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
ED7418	0:51f1ef89ec7b	1374	if ((lpcb->local_port == pcb->local_port) &&
ED7418	0:51f1ef89ec7b	1375	(ip_addr_isany(&lpcb->local_ip) \|\|
ED7418	0:51f1ef89ec7b	1376	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
ED7418	0:51f1ef89ec7b	1377	/* port and address of the listen pcb match the timed-out pcb */
ED7418	0:51f1ef89ec7b	1378	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
ED7418	0:51f1ef89ec7b	1379	lpcb->accepts_pending > 0);
ED7418	0:51f1ef89ec7b	1380	lpcb->accepts_pending--;
ED7418	0:51f1ef89ec7b	1381	break;
ED7418	0:51f1ef89ec7b	1382	}
ED7418	0:51f1ef89ec7b	1383	}
ED7418	0:51f1ef89ec7b	1384	}
ED7418	0:51f1ef89ec7b	1385	#endif /* TCP_LISTEN_BACKLOG */
ED7418	0:51f1ef89ec7b	1386
ED7418	0:51f1ef89ec7b	1387
ED7418	0:51f1ef89ec7b	1388	if (pcb->refused_data != NULL) {
ED7418	0:51f1ef89ec7b	1389	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
ED7418	0:51f1ef89ec7b	1390	pbuf_free(pcb->refused_data);
ED7418	0:51f1ef89ec7b	1391	pcb->refused_data = NULL;
ED7418	0:51f1ef89ec7b	1392	}
ED7418	0:51f1ef89ec7b	1393	if (pcb->unsent != NULL) {
ED7418	0:51f1ef89ec7b	1394	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
ED7418	0:51f1ef89ec7b	1395	}
ED7418	0:51f1ef89ec7b	1396	if (pcb->unacked != NULL) {
ED7418	0:51f1ef89ec7b	1397	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
ED7418	0:51f1ef89ec7b	1398	}
ED7418	0:51f1ef89ec7b	1399	#if TCP_QUEUE_OOSEQ
ED7418	0:51f1ef89ec7b	1400	if (pcb->ooseq != NULL) {
ED7418	0:51f1ef89ec7b	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
ED7418	0:51f1ef89ec7b	1402	}
ED7418	0:51f1ef89ec7b	1403	tcp_segs_free(pcb->ooseq);
ED7418	0:51f1ef89ec7b	1404	pcb->ooseq = NULL;
ED7418	0:51f1ef89ec7b	1405	#endif /* TCP_QUEUE_OOSEQ */
ED7418	0:51f1ef89ec7b	1406
ED7418	0:51f1ef89ec7b	1407	/* Stop the retransmission timer as it will expect data on unacked
ED7418	0:51f1ef89ec7b	1408	queue if it fires */
ED7418	0:51f1ef89ec7b	1409	pcb->rtime = -1;
ED7418	0:51f1ef89ec7b	1410
ED7418	0:51f1ef89ec7b	1411	tcp_segs_free(pcb->unsent);
ED7418	0:51f1ef89ec7b	1412	tcp_segs_free(pcb->unacked);
ED7418	0:51f1ef89ec7b	1413	pcb->unacked = pcb->unsent = NULL;
ED7418	0:51f1ef89ec7b	1414	#if TCP_OVERSIZE
ED7418	0:51f1ef89ec7b	1415	pcb->unsent_oversize = 0;
ED7418	0:51f1ef89ec7b	1416	#endif /* TCP_OVERSIZE */
ED7418	0:51f1ef89ec7b	1417	}
ED7418	0:51f1ef89ec7b	1418	}
ED7418	0:51f1ef89ec7b	1419
ED7418	0:51f1ef89ec7b	1420	/**
ED7418	0:51f1ef89ec7b	1421	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
ED7418	0:51f1ef89ec7b	1422	*
ED7418	0:51f1ef89ec7b	1423	* @param pcblist PCB list to purge.
ED7418	0:51f1ef89ec7b	1424	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
ED7418	0:51f1ef89ec7b	1425	*/
ED7418	0:51f1ef89ec7b	1426	void
ED7418	0:51f1ef89ec7b	1427	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
ED7418	0:51f1ef89ec7b	1428	{
ED7418	0:51f1ef89ec7b	1429	TCP_RMV(pcblist, pcb);
ED7418	0:51f1ef89ec7b	1430
ED7418	0:51f1ef89ec7b	1431	tcp_pcb_purge(pcb);
ED7418	0:51f1ef89ec7b	1432
ED7418	0:51f1ef89ec7b	1433	/* if there is an outstanding delayed ACKs, send it */
ED7418	0:51f1ef89ec7b	1434	if (pcb->state != TIME_WAIT &&
ED7418	0:51f1ef89ec7b	1435	pcb->state != LISTEN &&
ED7418	0:51f1ef89ec7b	1436	pcb->flags & TF_ACK_DELAY) {
ED7418	0:51f1ef89ec7b	1437	pcb->flags \|= TF_ACK_NOW;
ED7418	0:51f1ef89ec7b	1438	tcp_output(pcb);
ED7418	0:51f1ef89ec7b	1439	}
ED7418	0:51f1ef89ec7b	1440
ED7418	0:51f1ef89ec7b	1441	if (pcb->state != LISTEN) {
ED7418	0:51f1ef89ec7b	1442	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
ED7418	0:51f1ef89ec7b	1443	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
ED7418	0:51f1ef89ec7b	1444	#if TCP_QUEUE_OOSEQ
ED7418	0:51f1ef89ec7b	1445	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
ED7418	0:51f1ef89ec7b	1446	#endif /* TCP_QUEUE_OOSEQ */
ED7418	0:51f1ef89ec7b	1447	}
ED7418	0:51f1ef89ec7b	1448
ED7418	0:51f1ef89ec7b	1449	pcb->state = CLOSED;
ED7418	0:51f1ef89ec7b	1450
ED7418	0:51f1ef89ec7b	1451	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
ED7418	0:51f1ef89ec7b	1452	}
ED7418	0:51f1ef89ec7b	1453
ED7418	0:51f1ef89ec7b	1454	/**
ED7418	0:51f1ef89ec7b	1455	* Calculates a new initial sequence number for new connections.
ED7418	0:51f1ef89ec7b	1456	*
ED7418	0:51f1ef89ec7b	1457	* @return u32_t pseudo random sequence number
ED7418	0:51f1ef89ec7b	1458	*/
ED7418	0:51f1ef89ec7b	1459	u32_t
ED7418	0:51f1ef89ec7b	1460	tcp_next_iss(void)
ED7418	0:51f1ef89ec7b	1461	{
ED7418	0:51f1ef89ec7b	1462	static u32_t iss = 6510;
ED7418	0:51f1ef89ec7b	1463
ED7418	0:51f1ef89ec7b	1464	iss += tcp_ticks; /* XXX */
ED7418	0:51f1ef89ec7b	1465	return iss;
ED7418	0:51f1ef89ec7b	1466	}
ED7418	0:51f1ef89ec7b	1467
ED7418	0:51f1ef89ec7b	1468	#if TCP_CALCULATE_EFF_SEND_MSS
ED7418	0:51f1ef89ec7b	1469	/**
ED7418	0:51f1ef89ec7b	1470	* Calcluates the effective send mss that can be used for a specific IP address
ED7418	0:51f1ef89ec7b	1471	* by using ip_route to determin the netif used to send to the address and
ED7418	0:51f1ef89ec7b	1472	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
ED7418	0:51f1ef89ec7b	1473	*/
ED7418	0:51f1ef89ec7b	1474	u16_t
ED7418	0:51f1ef89ec7b	1475	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
ED7418	0:51f1ef89ec7b	1476	{
ED7418	0:51f1ef89ec7b	1477	u16_t mss_s;
ED7418	0:51f1ef89ec7b	1478	struct netif *outif;
ED7418	0:51f1ef89ec7b	1479
ED7418	0:51f1ef89ec7b	1480	outif = ip_route(addr);
ED7418	0:51f1ef89ec7b	1481	if ((outif != NULL) && (outif->mtu != 0)) {
ED7418	0:51f1ef89ec7b	1482	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
ED7418	0:51f1ef89ec7b	1483	/* RFC 1122, chap 4.2.2.6:
ED7418	0:51f1ef89ec7b	1484	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
ED7418	0:51f1ef89ec7b	1485	* We correct for TCP options in tcp_write(), and don't support IP options.
ED7418	0:51f1ef89ec7b	1486	*/
ED7418	0:51f1ef89ec7b	1487	sendmss = LWIP_MIN(sendmss, mss_s);
ED7418	0:51f1ef89ec7b	1488	}
ED7418	0:51f1ef89ec7b	1489	return sendmss;
ED7418	0:51f1ef89ec7b	1490	}
ED7418	0:51f1ef89ec7b	1491	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
ED7418	0:51f1ef89ec7b	1492
ED7418	0:51f1ef89ec7b	1493	const char*
ED7418	0:51f1ef89ec7b	1494	tcp_debug_state_str(enum tcp_state s)
ED7418	0:51f1ef89ec7b	1495	{
ED7418	0:51f1ef89ec7b	1496	return tcp_state_str[s];
ED7418	0:51f1ef89ec7b	1497	}
ED7418	0:51f1ef89ec7b	1498
ED7418	0:51f1ef89ec7b	1499	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
ED7418	0:51f1ef89ec7b	1500	/**
ED7418	0:51f1ef89ec7b	1501	* Print a tcp header for debugging purposes.
ED7418	0:51f1ef89ec7b	1502	*
ED7418	0:51f1ef89ec7b	1503	* @param tcphdr pointer to a struct tcp_hdr
ED7418	0:51f1ef89ec7b	1504	*/
ED7418	0:51f1ef89ec7b	1505	void
ED7418	0:51f1ef89ec7b	1506	tcp_debug_print(struct tcp_hdr *tcphdr)
ED7418	0:51f1ef89ec7b	1507	{
ED7418	0:51f1ef89ec7b	1508	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
ED7418	0:51f1ef89ec7b	1509	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ED7418	0:51f1ef89ec7b	1510	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
ED7418	0:51f1ef89ec7b	1511	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
ED7418	0:51f1ef89ec7b	1512	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ED7418	0:51f1ef89ec7b	1513	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
ED7418	0:51f1ef89ec7b	1514	ntohl(tcphdr->seqno)));
ED7418	0:51f1ef89ec7b	1515	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ED7418	0:51f1ef89ec7b	1516	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
ED7418	0:51f1ef89ec7b	1517	ntohl(tcphdr->ackno)));
ED7418	0:51f1ef89ec7b	1518	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ED7418	0:51f1ef89ec7b	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 (",
ED7418	0:51f1ef89ec7b	1520	TCPH_HDRLEN(tcphdr),
ED7418	0:51f1ef89ec7b	1521	TCPH_FLAGS(tcphdr) >> 5 & 1,
ED7418	0:51f1ef89ec7b	1522	TCPH_FLAGS(tcphdr) >> 4 & 1,
ED7418	0:51f1ef89ec7b	1523	TCPH_FLAGS(tcphdr) >> 3 & 1,
ED7418	0:51f1ef89ec7b	1524	TCPH_FLAGS(tcphdr) >> 2 & 1,
ED7418	0:51f1ef89ec7b	1525	TCPH_FLAGS(tcphdr) >> 1 & 1,
ED7418	0:51f1ef89ec7b	1526	TCPH_FLAGS(tcphdr) & 1,
ED7418	0:51f1ef89ec7b	1527	ntohs(tcphdr->wnd)));
ED7418	0:51f1ef89ec7b	1528	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
ED7418	0:51f1ef89ec7b	1529	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
ED7418	0:51f1ef89ec7b	1530	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ED7418	0:51f1ef89ec7b	1531	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
ED7418	0:51f1ef89ec7b	1532	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
ED7418	0:51f1ef89ec7b	1533	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ED7418	0:51f1ef89ec7b	1534	}
ED7418	0:51f1ef89ec7b	1535
ED7418	0:51f1ef89ec7b	1536	/**
ED7418	0:51f1ef89ec7b	1537	* Print a tcp state for debugging purposes.
ED7418	0:51f1ef89ec7b	1538	*
ED7418	0:51f1ef89ec7b	1539	* @param s enum tcp_state to print
ED7418	0:51f1ef89ec7b	1540	*/
ED7418	0:51f1ef89ec7b	1541	void
ED7418	0:51f1ef89ec7b	1542	tcp_debug_print_state(enum tcp_state s)
ED7418	0:51f1ef89ec7b	1543	{
ED7418	0:51f1ef89ec7b	1544	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
ED7418	0:51f1ef89ec7b	1545	}
ED7418	0:51f1ef89ec7b	1546
ED7418	0:51f1ef89ec7b	1547	/**
ED7418	0:51f1ef89ec7b	1548	* Print tcp flags for debugging purposes.
ED7418	0:51f1ef89ec7b	1549	*
ED7418	0:51f1ef89ec7b	1550	* @param flags tcp flags, all active flags are printed
ED7418	0:51f1ef89ec7b	1551	*/
ED7418	0:51f1ef89ec7b	1552	void
ED7418	0:51f1ef89ec7b	1553	tcp_debug_print_flags(u8_t flags)
ED7418	0:51f1ef89ec7b	1554	{
ED7418	0:51f1ef89ec7b	1555	if (flags & TCP_FIN) {
ED7418	0:51f1ef89ec7b	1556	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
ED7418	0:51f1ef89ec7b	1557	}
ED7418	0:51f1ef89ec7b	1558	if (flags & TCP_SYN) {
ED7418	0:51f1ef89ec7b	1559	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
ED7418	0:51f1ef89ec7b	1560	}
ED7418	0:51f1ef89ec7b	1561	if (flags & TCP_RST) {
ED7418	0:51f1ef89ec7b	1562	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
ED7418	0:51f1ef89ec7b	1563	}
ED7418	0:51f1ef89ec7b	1564	if (flags & TCP_PSH) {
ED7418	0:51f1ef89ec7b	1565	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
ED7418	0:51f1ef89ec7b	1566	}
ED7418	0:51f1ef89ec7b	1567	if (flags & TCP_ACK) {
ED7418	0:51f1ef89ec7b	1568	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
ED7418	0:51f1ef89ec7b	1569	}
ED7418	0:51f1ef89ec7b	1570	if (flags & TCP_URG) {
ED7418	0:51f1ef89ec7b	1571	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
ED7418	0:51f1ef89ec7b	1572	}
ED7418	0:51f1ef89ec7b	1573	if (flags & TCP_ECE) {
ED7418	0:51f1ef89ec7b	1574	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
ED7418	0:51f1ef89ec7b	1575	}
ED7418	0:51f1ef89ec7b	1576	if (flags & TCP_CWR) {
ED7418	0:51f1ef89ec7b	1577	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
ED7418	0:51f1ef89ec7b	1578	}
ED7418	0:51f1ef89ec7b	1579	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
ED7418	0:51f1ef89ec7b	1580	}
ED7418	0:51f1ef89ec7b	1581
ED7418	0:51f1ef89ec7b	1582	/**
ED7418	0:51f1ef89ec7b	1583	* Print all tcp_pcbs in every list for debugging purposes.
ED7418	0:51f1ef89ec7b	1584	*/
ED7418	0:51f1ef89ec7b	1585	void
ED7418	0:51f1ef89ec7b	1586	tcp_debug_print_pcbs(void)
ED7418	0:51f1ef89ec7b	1587	{
ED7418	0:51f1ef89ec7b	1588	struct tcp_pcb *pcb;
ED7418	0:51f1ef89ec7b	1589	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
ED7418	0:51f1ef89ec7b	1590	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
ED7418	0:51f1ef89ec7b	1591	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
ED7418	0:51f1ef89ec7b	1592	pcb->local_port, pcb->remote_port,
ED7418	0:51f1ef89ec7b	1593	pcb->snd_nxt, pcb->rcv_nxt));
ED7418	0:51f1ef89ec7b	1594	tcp_debug_print_state(pcb->state);
ED7418	0:51f1ef89ec7b	1595	}
ED7418	0:51f1ef89ec7b	1596	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
ED7418	0:51f1ef89ec7b	1597	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
ED7418	0:51f1ef89ec7b	1598	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
ED7418	0:51f1ef89ec7b	1599	pcb->local_port, pcb->remote_port,
ED7418	0:51f1ef89ec7b	1600	pcb->snd_nxt, pcb->rcv_nxt));
ED7418	0:51f1ef89ec7b	1601	tcp_debug_print_state(pcb->state);
ED7418	0:51f1ef89ec7b	1602	}
ED7418	0:51f1ef89ec7b	1603	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
ED7418	0:51f1ef89ec7b	1604	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
ED7418	0:51f1ef89ec7b	1605	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
ED7418	0:51f1ef89ec7b	1606	pcb->local_port, pcb->remote_port,
ED7418	0:51f1ef89ec7b	1607	pcb->snd_nxt, pcb->rcv_nxt));
ED7418	0:51f1ef89ec7b	1608	tcp_debug_print_state(pcb->state);
ED7418	0:51f1ef89ec7b	1609	}
ED7418	0:51f1ef89ec7b	1610	}
ED7418	0:51f1ef89ec7b	1611
ED7418	0:51f1ef89ec7b	1612	/**
ED7418	0:51f1ef89ec7b	1613	* Check state consistency of the tcp_pcb lists.
ED7418	0:51f1ef89ec7b	1614	*/
ED7418	0:51f1ef89ec7b	1615	s16_t
ED7418	0:51f1ef89ec7b	1616	tcp_pcbs_sane(void)
ED7418	0:51f1ef89ec7b	1617	{
ED7418	0:51f1ef89ec7b	1618	struct tcp_pcb *pcb;
ED7418	0:51f1ef89ec7b	1619	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
ED7418	0:51f1ef89ec7b	1620	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
ED7418	0:51f1ef89ec7b	1621	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
ED7418	0:51f1ef89ec7b	1622	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
ED7418	0:51f1ef89ec7b	1623	}
ED7418	0:51f1ef89ec7b	1624	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
ED7418	0:51f1ef89ec7b	1625	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
ED7418	0:51f1ef89ec7b	1626	}
ED7418	0:51f1ef89ec7b	1627	return 1;
ED7418	0:51f1ef89ec7b	1628	}
ED7418	0:51f1ef89ec7b	1629	#endif /* TCP_DEBUG */
ED7418	0:51f1ef89ec7b	1630
ED7418	0:51f1ef89ec7b	1631	#endif /* LWIP_TCP */

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Type:	Program
Created:	16 Jun 2014
Imports:	19
Forks:	0
Commits:	2
Dependents:	1
Dependencies:	3
Followers:	1

NetServices/lwip/core/tcp.c@1:809b59c7a800, 2014-06-16 (annotated)

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