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NetStack/lwip/core/tcp.c@0:1a61c61d0845, 2012-04-03 (annotated)

Committer:: dcoban
Date:: Tue Apr 03 18:43:13 2012 +0000
Revision:: 0:1a61c61d0845

Who changed what in which revision?

User	Revision	Line number	New contents of line
dcoban	0:1a61c61d0845	1	/**
dcoban	0:1a61c61d0845	2	* @file
dcoban	0:1a61c61d0845	3	* Transmission Control Protocol for IP
dcoban	0:1a61c61d0845	4	*
dcoban	0:1a61c61d0845	5	* This file contains common functions for the TCP implementation, such as functinos
dcoban	0:1a61c61d0845	6	* for manipulating the data structures and the TCP timer functions. TCP functions
dcoban	0:1a61c61d0845	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
dcoban	0:1a61c61d0845	8	*
dcoban	0:1a61c61d0845	9	*/
dcoban	0:1a61c61d0845	10
dcoban	0:1a61c61d0845	11	/*
dcoban	0:1a61c61d0845	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
dcoban	0:1a61c61d0845	13	* All rights reserved.
dcoban	0:1a61c61d0845	14	*
dcoban	0:1a61c61d0845	15	* Redistribution and use in source and binary forms, with or without modification,
dcoban	0:1a61c61d0845	16	* are permitted provided that the following conditions are met:
dcoban	0:1a61c61d0845	17	*
dcoban	0:1a61c61d0845	18	* 1. Redistributions of source code must retain the above copyright notice,
dcoban	0:1a61c61d0845	19	* this list of conditions and the following disclaimer.
dcoban	0:1a61c61d0845	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
dcoban	0:1a61c61d0845	21	* this list of conditions and the following disclaimer in the documentation
dcoban	0:1a61c61d0845	22	* and/or other materials provided with the distribution.
dcoban	0:1a61c61d0845	23	* 3. The name of the author may not be used to endorse or promote products
dcoban	0:1a61c61d0845	24	* derived from this software without specific prior written permission.
dcoban	0:1a61c61d0845	25	*
dcoban	0:1a61c61d0845	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
dcoban	0:1a61c61d0845	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
dcoban	0:1a61c61d0845	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
dcoban	0:1a61c61d0845	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
dcoban	0:1a61c61d0845	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
dcoban	0:1a61c61d0845	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
dcoban	0:1a61c61d0845	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
dcoban	0:1a61c61d0845	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
dcoban	0:1a61c61d0845	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
dcoban	0:1a61c61d0845	35	* OF SUCH DAMAGE.
dcoban	0:1a61c61d0845	36	*
dcoban	0:1a61c61d0845	37	* This file is part of the lwIP TCP/IP stack.
dcoban	0:1a61c61d0845	38	*
dcoban	0:1a61c61d0845	39	* Author: Adam Dunkels <adam@sics.se>
dcoban	0:1a61c61d0845	40	*
dcoban	0:1a61c61d0845	41	*/
dcoban	0:1a61c61d0845	42
dcoban	0:1a61c61d0845	43	#include "lwip/opt.h"
dcoban	0:1a61c61d0845	44
dcoban	0:1a61c61d0845	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
dcoban	0:1a61c61d0845	46
dcoban	0:1a61c61d0845	47	#include "lwip/def.h"
dcoban	0:1a61c61d0845	48	#include "lwip/mem.h"
dcoban	0:1a61c61d0845	49	#include "lwip/memp.h"
dcoban	0:1a61c61d0845	50	#include "lwip/snmp.h"
dcoban	0:1a61c61d0845	51	#include "lwip/tcp.h"
dcoban	0:1a61c61d0845	52	#include "lwip/tcp_impl.h"
dcoban	0:1a61c61d0845	53	#include "lwip/debug.h"
dcoban	0:1a61c61d0845	54	#include "lwip/stats.h"
dcoban	0:1a61c61d0845	55
dcoban	0:1a61c61d0845	56	#include <string.h>
dcoban	0:1a61c61d0845	57
dcoban	0:1a61c61d0845	58	const char * const tcp_state_str[] = {
dcoban	0:1a61c61d0845	59	"CLOSED",
dcoban	0:1a61c61d0845	60	"LISTEN",
dcoban	0:1a61c61d0845	61	"SYN_SENT",
dcoban	0:1a61c61d0845	62	"SYN_RCVD",
dcoban	0:1a61c61d0845	63	"ESTABLISHED",
dcoban	0:1a61c61d0845	64	"FIN_WAIT_1",
dcoban	0:1a61c61d0845	65	"FIN_WAIT_2",
dcoban	0:1a61c61d0845	66	"CLOSE_WAIT",
dcoban	0:1a61c61d0845	67	"CLOSING",
dcoban	0:1a61c61d0845	68	"LAST_ACK",
dcoban	0:1a61c61d0845	69	"TIME_WAIT"
dcoban	0:1a61c61d0845	70	};
dcoban	0:1a61c61d0845	71
dcoban	0:1a61c61d0845	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
dcoban	0:1a61c61d0845	73	u32_t tcp_ticks;
dcoban	0:1a61c61d0845	74	const u8_t tcp_backoff[13] =
dcoban	0:1a61c61d0845	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
dcoban	0:1a61c61d0845	76	/* Times per slowtmr hits */
dcoban	0:1a61c61d0845	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
dcoban	0:1a61c61d0845	78
dcoban	0:1a61c61d0845	79	/* The TCP PCB lists. */
dcoban	0:1a61c61d0845	80
dcoban	0:1a61c61d0845	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
dcoban	0:1a61c61d0845	82	struct tcp_pcb *tcp_bound_pcbs;
dcoban	0:1a61c61d0845	83	/** List of all TCP PCBs in LISTEN state */
dcoban	0:1a61c61d0845	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
dcoban	0:1a61c61d0845	85	/** List of all TCP PCBs that are in a state in which
dcoban	0:1a61c61d0845	86	* they accept or send data. */
dcoban	0:1a61c61d0845	87	struct tcp_pcb *tcp_active_pcbs;
dcoban	0:1a61c61d0845	88	/** List of all TCP PCBs in TIME-WAIT state */
dcoban	0:1a61c61d0845	89	struct tcp_pcb *tcp_tw_pcbs;
dcoban	0:1a61c61d0845	90
dcoban	0:1a61c61d0845	91	#define NUM_TCP_PCB_LISTS 4
dcoban	0:1a61c61d0845	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
dcoban	0:1a61c61d0845	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
dcoban	0:1a61c61d0845	94	struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
dcoban	0:1a61c61d0845	95	&tcp_active_pcbs, &tcp_tw_pcbs};
dcoban	0:1a61c61d0845	96
dcoban	0:1a61c61d0845	97	/** Only used for temporary storage. */
dcoban	0:1a61c61d0845	98	struct tcp_pcb *tcp_tmp_pcb;
dcoban	0:1a61c61d0845	99
dcoban	0:1a61c61d0845	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
dcoban	0:1a61c61d0845	101	static u8_t tcp_timer;
dcoban	0:1a61c61d0845	102	static u16_t tcp_new_port(void);
dcoban	0:1a61c61d0845	103
dcoban	0:1a61c61d0845	104	/**
dcoban	0:1a61c61d0845	105	* Called periodically to dispatch TCP timers.
dcoban	0:1a61c61d0845	106	*
dcoban	0:1a61c61d0845	107	*/
dcoban	0:1a61c61d0845	108	void
dcoban	0:1a61c61d0845	109	tcp_tmr(void)
dcoban	0:1a61c61d0845	110	{
dcoban	0:1a61c61d0845	111	/* Call tcp_fasttmr() every 250 ms */
dcoban	0:1a61c61d0845	112	tcp_fasttmr();
dcoban	0:1a61c61d0845	113
dcoban	0:1a61c61d0845	114	if (++tcp_timer & 1) {
dcoban	0:1a61c61d0845	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
dcoban	0:1a61c61d0845	116	tcp_tmr() is called. */
dcoban	0:1a61c61d0845	117	tcp_slowtmr();
dcoban	0:1a61c61d0845	118	}
dcoban	0:1a61c61d0845	119	}
dcoban	0:1a61c61d0845	120
dcoban	0:1a61c61d0845	121	/**
dcoban	0:1a61c61d0845	122	* Closes the TX side of a connection held by the PCB.
dcoban	0:1a61c61d0845	123	* For tcp_close(), a RST is sent if the application didn't receive all data
dcoban	0:1a61c61d0845	124	* (tcp_recved() not called for all data passed to recv callback).
dcoban	0:1a61c61d0845	125	*
dcoban	0:1a61c61d0845	126	* Listening pcbs are freed and may not be referenced any more.
dcoban	0:1a61c61d0845	127	* Connection pcbs are freed if not yet connected and may not be referenced
dcoban	0:1a61c61d0845	128	* any more. If a connection is established (at least SYN received or in
dcoban	0:1a61c61d0845	129	* a closing state), the connection is closed, and put in a closing state.
dcoban	0:1a61c61d0845	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
dcoban	0:1a61c61d0845	131	* unsafe to reference it.
dcoban	0:1a61c61d0845	132	*
dcoban	0:1a61c61d0845	133	* @param pcb the tcp_pcb to close
dcoban	0:1a61c61d0845	134	* @return ERR_OK if connection has been closed
dcoban	0:1a61c61d0845	135	* another err_t if closing failed and pcb is not freed
dcoban	0:1a61c61d0845	136	*/
dcoban	0:1a61c61d0845	137	static err_t
dcoban	0:1a61c61d0845	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
dcoban	0:1a61c61d0845	139	{
dcoban	0:1a61c61d0845	140	err_t err;
dcoban	0:1a61c61d0845	141
dcoban	0:1a61c61d0845	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
dcoban	0:1a61c61d0845	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
dcoban	0:1a61c61d0845	144	/* Not all data received by application, send RST to tell the remote
dcoban	0:1a61c61d0845	145	side about this. */
dcoban	0:1a61c61d0845	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
dcoban	0:1a61c61d0845	147
dcoban	0:1a61c61d0845	148	/* don't call tcp_abort here: we must not deallocate the pcb since
dcoban	0:1a61c61d0845	149	that might not be expected when calling tcp_close */
dcoban	0:1a61c61d0845	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
dcoban	0:1a61c61d0845	151	pcb->local_port, pcb->remote_port);
dcoban	0:1a61c61d0845	152
dcoban	0:1a61c61d0845	153	tcp_pcb_purge(pcb);
dcoban	0:1a61c61d0845	154
dcoban	0:1a61c61d0845	155	/* TODO: to which state do we move now? */
dcoban	0:1a61c61d0845	156
dcoban	0:1a61c61d0845	157	/* move to TIME_WAIT since we close actively */
dcoban	0:1a61c61d0845	158	TCP_RMV(&tcp_active_pcbs, pcb);
dcoban	0:1a61c61d0845	159	pcb->state = TIME_WAIT;
dcoban	0:1a61c61d0845	160	TCP_REG(&tcp_tw_pcbs, pcb);
dcoban	0:1a61c61d0845	161
dcoban	0:1a61c61d0845	162	return ERR_OK;
dcoban	0:1a61c61d0845	163	}
dcoban	0:1a61c61d0845	164	}
dcoban	0:1a61c61d0845	165
dcoban	0:1a61c61d0845	166	switch (pcb->state) {
dcoban	0:1a61c61d0845	167	case CLOSED:
dcoban	0:1a61c61d0845	168	/* Closing a pcb in the CLOSED state might seem erroneous,
dcoban	0:1a61c61d0845	169	* however, it is in this state once allocated and as yet unused
dcoban	0:1a61c61d0845	170	* and the user needs some way to free it should the need arise.
dcoban	0:1a61c61d0845	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
dcoban	0:1a61c61d0845	172	* or for a pcb that has been used and then entered the CLOSED state
dcoban	0:1a61c61d0845	173	* is erroneous, but this should never happen as the pcb has in those cases
dcoban	0:1a61c61d0845	174	* been freed, and so any remaining handles are bogus. */
dcoban	0:1a61c61d0845	175	err = ERR_OK;
dcoban	0:1a61c61d0845	176	TCP_RMV(&tcp_bound_pcbs, pcb);
dcoban	0:1a61c61d0845	177	memp_free(MEMP_TCP_PCB, pcb);
dcoban	0:1a61c61d0845	178	pcb = NULL;
dcoban	0:1a61c61d0845	179	break;
dcoban	0:1a61c61d0845	180	case LISTEN:
dcoban	0:1a61c61d0845	181	err = ERR_OK;
dcoban	0:1a61c61d0845	182	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
dcoban	0:1a61c61d0845	183	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
dcoban	0:1a61c61d0845	184	pcb = NULL;
dcoban	0:1a61c61d0845	185	break;
dcoban	0:1a61c61d0845	186	case SYN_SENT:
dcoban	0:1a61c61d0845	187	err = ERR_OK;
dcoban	0:1a61c61d0845	188	tcp_pcb_remove(&tcp_active_pcbs, pcb);
dcoban	0:1a61c61d0845	189	memp_free(MEMP_TCP_PCB, pcb);
dcoban	0:1a61c61d0845	190	pcb = NULL;
dcoban	0:1a61c61d0845	191	snmp_inc_tcpattemptfails();
dcoban	0:1a61c61d0845	192	break;
dcoban	0:1a61c61d0845	193	case SYN_RCVD:
dcoban	0:1a61c61d0845	194	err = tcp_send_fin(pcb);
dcoban	0:1a61c61d0845	195	if (err == ERR_OK) {
dcoban	0:1a61c61d0845	196	snmp_inc_tcpattemptfails();
dcoban	0:1a61c61d0845	197	pcb->state = FIN_WAIT_1;
dcoban	0:1a61c61d0845	198	}
dcoban	0:1a61c61d0845	199	break;
dcoban	0:1a61c61d0845	200	case ESTABLISHED:
dcoban	0:1a61c61d0845	201	err = tcp_send_fin(pcb);
dcoban	0:1a61c61d0845	202	if (err == ERR_OK) {
dcoban	0:1a61c61d0845	203	snmp_inc_tcpestabresets();
dcoban	0:1a61c61d0845	204	pcb->state = FIN_WAIT_1;
dcoban	0:1a61c61d0845	205	}
dcoban	0:1a61c61d0845	206	break;
dcoban	0:1a61c61d0845	207	case CLOSE_WAIT:
dcoban	0:1a61c61d0845	208	err = tcp_send_fin(pcb);
dcoban	0:1a61c61d0845	209	if (err == ERR_OK) {
dcoban	0:1a61c61d0845	210	snmp_inc_tcpestabresets();
dcoban	0:1a61c61d0845	211	pcb->state = LAST_ACK;
dcoban	0:1a61c61d0845	212	}
dcoban	0:1a61c61d0845	213	break;
dcoban	0:1a61c61d0845	214	default:
dcoban	0:1a61c61d0845	215	/* Has already been closed, do nothing. */
dcoban	0:1a61c61d0845	216	err = ERR_OK;
dcoban	0:1a61c61d0845	217	pcb = NULL;
dcoban	0:1a61c61d0845	218	break;
dcoban	0:1a61c61d0845	219	}
dcoban	0:1a61c61d0845	220
dcoban	0:1a61c61d0845	221	if (pcb != NULL && err == ERR_OK) {
dcoban	0:1a61c61d0845	222	/* To ensure all data has been sent when tcp_close returns, we have
dcoban	0:1a61c61d0845	223	to make sure tcp_output doesn't fail.
dcoban	0:1a61c61d0845	224	Since we don't really have to ensure all data has been sent when tcp_close
dcoban	0:1a61c61d0845	225	returns (unsent data is sent from tcp timer functions, also), we don't care
dcoban	0:1a61c61d0845	226	for the return value of tcp_output for now. */
dcoban	0:1a61c61d0845	227	/* @todo: When implementing SO_LINGER, this must be changed somehow:
dcoban	0:1a61c61d0845	228	If SOF_LINGER is set, the data should be sent and acked before close returns.
dcoban	0:1a61c61d0845	229	This can only be valid for sequential APIs, not for the raw API. */
dcoban	0:1a61c61d0845	230	tcp_output(pcb);
dcoban	0:1a61c61d0845	231	}
dcoban	0:1a61c61d0845	232	return err;
dcoban	0:1a61c61d0845	233	}
dcoban	0:1a61c61d0845	234
dcoban	0:1a61c61d0845	235	/**
dcoban	0:1a61c61d0845	236	* Closes the connection held by the PCB.
dcoban	0:1a61c61d0845	237	*
dcoban	0:1a61c61d0845	238	* Listening pcbs are freed and may not be referenced any more.
dcoban	0:1a61c61d0845	239	* Connection pcbs are freed if not yet connected and may not be referenced
dcoban	0:1a61c61d0845	240	* any more. If a connection is established (at least SYN received or in
dcoban	0:1a61c61d0845	241	* a closing state), the connection is closed, and put in a closing state.
dcoban	0:1a61c61d0845	242	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
dcoban	0:1a61c61d0845	243	* unsafe to reference it (unless an error is returned).
dcoban	0:1a61c61d0845	244	*
dcoban	0:1a61c61d0845	245	* @param pcb the tcp_pcb to close
dcoban	0:1a61c61d0845	246	* @return ERR_OK if connection has been closed
dcoban	0:1a61c61d0845	247	* another err_t if closing failed and pcb is not freed
dcoban	0:1a61c61d0845	248	*/
dcoban	0:1a61c61d0845	249	err_t
dcoban	0:1a61c61d0845	250	tcp_close(struct tcp_pcb *pcb)
dcoban	0:1a61c61d0845	251	{
dcoban	0:1a61c61d0845	252	#if TCP_DEBUG
dcoban	0:1a61c61d0845	253	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
dcoban	0:1a61c61d0845	254	tcp_debug_print_state(pcb->state);
dcoban	0:1a61c61d0845	255	#endif /* TCP_DEBUG */
dcoban	0:1a61c61d0845	256
dcoban	0:1a61c61d0845	257	if (pcb->state != LISTEN) {
dcoban	0:1a61c61d0845	258	/* Set a flag not to receive any more data... */
dcoban	0:1a61c61d0845	259	pcb->flags \|= TF_RXCLOSED;
dcoban	0:1a61c61d0845	260	}
dcoban	0:1a61c61d0845	261	/* ... and close */
dcoban	0:1a61c61d0845	262	return tcp_close_shutdown(pcb, 1);
dcoban	0:1a61c61d0845	263	}
dcoban	0:1a61c61d0845	264
dcoban	0:1a61c61d0845	265	/**
dcoban	0:1a61c61d0845	266	* Causes all or part of a full-duplex connection of this PCB to be shut down.
dcoban	0:1a61c61d0845	267	* This doesn't deallocate the PCB!
dcoban	0:1a61c61d0845	268	*
dcoban	0:1a61c61d0845	269	* @param pcb PCB to shutdown
dcoban	0:1a61c61d0845	270	* @param shut_rx shut down receive side if this is != 0
dcoban	0:1a61c61d0845	271	* @param shut_tx shut down send side if this is != 0
dcoban	0:1a61c61d0845	272	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
dcoban	0:1a61c61d0845	273	* another err_t on error.
dcoban	0:1a61c61d0845	274	*/
dcoban	0:1a61c61d0845	275	err_t
dcoban	0:1a61c61d0845	276	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
dcoban	0:1a61c61d0845	277	{
dcoban	0:1a61c61d0845	278	if (pcb->state == LISTEN) {
dcoban	0:1a61c61d0845	279	return ERR_CONN;
dcoban	0:1a61c61d0845	280	}
dcoban	0:1a61c61d0845	281	if (shut_rx) {
dcoban	0:1a61c61d0845	282	/* shut down the receive side: free buffered data... */
dcoban	0:1a61c61d0845	283	if (pcb->refused_data != NULL) {
dcoban	0:1a61c61d0845	284	pbuf_free(pcb->refused_data);
dcoban	0:1a61c61d0845	285	pcb->refused_data = NULL;
dcoban	0:1a61c61d0845	286	}
dcoban	0:1a61c61d0845	287	/* ... and set a flag not to receive any more data */
dcoban	0:1a61c61d0845	288	pcb->flags \|= TF_RXCLOSED;
dcoban	0:1a61c61d0845	289	}
dcoban	0:1a61c61d0845	290	if (shut_tx) {
dcoban	0:1a61c61d0845	291	/* This can't happen twice since if it succeeds, the pcb's state is changed.
dcoban	0:1a61c61d0845	292	Only close in these states as the others directly deallocate the PCB */
dcoban	0:1a61c61d0845	293	switch (pcb->state) {
dcoban	0:1a61c61d0845	294	case SYN_RCVD:
dcoban	0:1a61c61d0845	295	case ESTABLISHED:
dcoban	0:1a61c61d0845	296	case CLOSE_WAIT:
dcoban	0:1a61c61d0845	297	return tcp_close_shutdown(pcb, 0);
dcoban	0:1a61c61d0845	298	default:
dcoban	0:1a61c61d0845	299	/* don't shut down other states */
dcoban	0:1a61c61d0845	300	break;
dcoban	0:1a61c61d0845	301	}
dcoban	0:1a61c61d0845	302	}
dcoban	0:1a61c61d0845	303	/* @todo: return another err_t if not in correct state or already shut? */
dcoban	0:1a61c61d0845	304	return ERR_OK;
dcoban	0:1a61c61d0845	305	}
dcoban	0:1a61c61d0845	306
dcoban	0:1a61c61d0845	307	/**
dcoban	0:1a61c61d0845	308	* Abandons a connection and optionally sends a RST to the remote
dcoban	0:1a61c61d0845	309	* host. Deletes the local protocol control block. This is done when
dcoban	0:1a61c61d0845	310	* a connection is killed because of shortage of memory.
dcoban	0:1a61c61d0845	311	*
dcoban	0:1a61c61d0845	312	* @param pcb the tcp_pcb to abort
dcoban	0:1a61c61d0845	313	* @param reset boolean to indicate whether a reset should be sent
dcoban	0:1a61c61d0845	314	*/
dcoban	0:1a61c61d0845	315	void
dcoban	0:1a61c61d0845	316	tcp_abandon(struct tcp_pcb *pcb, int reset)
dcoban	0:1a61c61d0845	317	{
dcoban	0:1a61c61d0845	318	u32_t seqno, ackno;
dcoban	0:1a61c61d0845	319	u16_t remote_port, local_port;
dcoban	0:1a61c61d0845	320	ip_addr_t remote_ip, local_ip;
dcoban	0:1a61c61d0845	321	#if LWIP_CALLBACK_API
dcoban	0:1a61c61d0845	322	tcp_err_fn errf;
dcoban	0:1a61c61d0845	323	#endif /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	324	void *errf_arg;
dcoban	0:1a61c61d0845	325
dcoban	0:1a61c61d0845	326	/* pcb->state LISTEN not allowed here */
dcoban	0:1a61c61d0845	327	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
dcoban	0:1a61c61d0845	328	pcb->state != LISTEN);
dcoban	0:1a61c61d0845	329	/* Figure out on which TCP PCB list we are, and remove us. If we
dcoban	0:1a61c61d0845	330	are in an active state, call the receive function associated with
dcoban	0:1a61c61d0845	331	the PCB with a NULL argument, and send an RST to the remote end. */
dcoban	0:1a61c61d0845	332	if (pcb->state == TIME_WAIT) {
dcoban	0:1a61c61d0845	333	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
dcoban	0:1a61c61d0845	334	memp_free(MEMP_TCP_PCB, pcb);
dcoban	0:1a61c61d0845	335	} else {
dcoban	0:1a61c61d0845	336	seqno = pcb->snd_nxt;
dcoban	0:1a61c61d0845	337	ackno = pcb->rcv_nxt;
dcoban	0:1a61c61d0845	338	ip_addr_copy(local_ip, pcb->local_ip);
dcoban	0:1a61c61d0845	339	ip_addr_copy(remote_ip, pcb->remote_ip);
dcoban	0:1a61c61d0845	340	local_port = pcb->local_port;
dcoban	0:1a61c61d0845	341	remote_port = pcb->remote_port;
dcoban	0:1a61c61d0845	342	#if LWIP_CALLBACK_API
dcoban	0:1a61c61d0845	343	errf = pcb->errf;
dcoban	0:1a61c61d0845	344	#endif /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	345	errf_arg = pcb->callback_arg;
dcoban	0:1a61c61d0845	346	tcp_pcb_remove(&tcp_active_pcbs, pcb);
dcoban	0:1a61c61d0845	347	if (pcb->unacked != NULL) {
dcoban	0:1a61c61d0845	348	tcp_segs_free(pcb->unacked);
dcoban	0:1a61c61d0845	349	}
dcoban	0:1a61c61d0845	350	if (pcb->unsent != NULL) {
dcoban	0:1a61c61d0845	351	tcp_segs_free(pcb->unsent);
dcoban	0:1a61c61d0845	352	}
dcoban	0:1a61c61d0845	353	#if TCP_QUEUE_OOSEQ
dcoban	0:1a61c61d0845	354	if (pcb->ooseq != NULL) {
dcoban	0:1a61c61d0845	355	tcp_segs_free(pcb->ooseq);
dcoban	0:1a61c61d0845	356	}
dcoban	0:1a61c61d0845	357	#endif /* TCP_QUEUE_OOSEQ */
dcoban	0:1a61c61d0845	358	memp_free(MEMP_TCP_PCB, pcb);
dcoban	0:1a61c61d0845	359	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
dcoban	0:1a61c61d0845	360	if (reset) {
dcoban	0:1a61c61d0845	361	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
dcoban	0:1a61c61d0845	362	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
dcoban	0:1a61c61d0845	363	}
dcoban	0:1a61c61d0845	364	}
dcoban	0:1a61c61d0845	365	}
dcoban	0:1a61c61d0845	366
dcoban	0:1a61c61d0845	367	/**
dcoban	0:1a61c61d0845	368	* Aborts the connection by sending a RST (reset) segment to the remote
dcoban	0:1a61c61d0845	369	* host. The pcb is deallocated. This function never fails.
dcoban	0:1a61c61d0845	370	*
dcoban	0:1a61c61d0845	371	* ATTENTION: When calling this from one of the TCP callbacks, make
dcoban	0:1a61c61d0845	372	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
dcoban	0:1a61c61d0845	373	* or you will risk accessing deallocated memory or memory leaks!
dcoban	0:1a61c61d0845	374	*
dcoban	0:1a61c61d0845	375	* @param pcb the tcp pcb to abort
dcoban	0:1a61c61d0845	376	*/
dcoban	0:1a61c61d0845	377	void
dcoban	0:1a61c61d0845	378	tcp_abort(struct tcp_pcb *pcb)
dcoban	0:1a61c61d0845	379	{
dcoban	0:1a61c61d0845	380	tcp_abandon(pcb, 1);
dcoban	0:1a61c61d0845	381	}
dcoban	0:1a61c61d0845	382
dcoban	0:1a61c61d0845	383	/**
dcoban	0:1a61c61d0845	384	* Binds the connection to a local portnumber and IP address. If the
dcoban	0:1a61c61d0845	385	* IP address is not given (i.e., ipaddr == NULL), the IP address of
dcoban	0:1a61c61d0845	386	* the outgoing network interface is used instead.
dcoban	0:1a61c61d0845	387	*
dcoban	0:1a61c61d0845	388	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
dcoban	0:1a61c61d0845	389	* already bound!)
dcoban	0:1a61c61d0845	390	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
dcoban	0:1a61c61d0845	391	* to any local address
dcoban	0:1a61c61d0845	392	* @param port the local port to bind to
dcoban	0:1a61c61d0845	393	* @return ERR_USE if the port is already in use
dcoban	0:1a61c61d0845	394	* ERR_OK if bound
dcoban	0:1a61c61d0845	395	*/
dcoban	0:1a61c61d0845	396	err_t
dcoban	0:1a61c61d0845	397	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
dcoban	0:1a61c61d0845	398	{
dcoban	0:1a61c61d0845	399	int i;
dcoban	0:1a61c61d0845	400	int max_pcb_list = NUM_TCP_PCB_LISTS;
dcoban	0:1a61c61d0845	401	struct tcp_pcb *cpcb;
dcoban	0:1a61c61d0845	402
dcoban	0:1a61c61d0845	403	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
dcoban	0:1a61c61d0845	404
dcoban	0:1a61c61d0845	405	#if SO_REUSE
dcoban	0:1a61c61d0845	406	/* Unless the REUSEADDR flag is set,
dcoban	0:1a61c61d0845	407	we have to check the pcbs in TIME-WAIT state, also.
dcoban	0:1a61c61d0845	408	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
dcoban	0:1a61c61d0845	409	packets using both local and remote IP addresses and ports to distinguish.
dcoban	0:1a61c61d0845	410	*/
dcoban	0:1a61c61d0845	411	#if SO_REUSE
dcoban	0:1a61c61d0845	412	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
dcoban	0:1a61c61d0845	413	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
dcoban	0:1a61c61d0845	414	}
dcoban	0:1a61c61d0845	415	#endif /* SO_REUSE */
dcoban	0:1a61c61d0845	416	#endif /* SO_REUSE */
dcoban	0:1a61c61d0845	417
dcoban	0:1a61c61d0845	418	if (port == 0) {
dcoban	0:1a61c61d0845	419	port = tcp_new_port();
dcoban	0:1a61c61d0845	420	}
dcoban	0:1a61c61d0845	421
dcoban	0:1a61c61d0845	422	/* Check if the address already is in use (on all lists) */
dcoban	0:1a61c61d0845	423	for (i = 0; i < max_pcb_list; i++) {
dcoban	0:1a61c61d0845	424	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
dcoban	0:1a61c61d0845	425	if (cpcb->local_port == port) {
dcoban	0:1a61c61d0845	426	#if SO_REUSE
dcoban	0:1a61c61d0845	427	/* Omit checking for the same port if both pcbs have REUSEADDR set.
dcoban	0:1a61c61d0845	428	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
dcoban	0:1a61c61d0845	429	tcp_connect. */
dcoban	0:1a61c61d0845	430	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
dcoban	0:1a61c61d0845	431	((cpcb->so_options & SOF_REUSEADDR) == 0))
dcoban	0:1a61c61d0845	432	#endif /* SO_REUSE */
dcoban	0:1a61c61d0845	433	{
dcoban	0:1a61c61d0845	434	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
dcoban	0:1a61c61d0845	435	ip_addr_isany(ipaddr) \|\|
dcoban	0:1a61c61d0845	436	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
dcoban	0:1a61c61d0845	437	return ERR_USE;
dcoban	0:1a61c61d0845	438	}
dcoban	0:1a61c61d0845	439	}
dcoban	0:1a61c61d0845	440	}
dcoban	0:1a61c61d0845	441	}
dcoban	0:1a61c61d0845	442	}
dcoban	0:1a61c61d0845	443
dcoban	0:1a61c61d0845	444	if (!ip_addr_isany(ipaddr)) {
dcoban	0:1a61c61d0845	445	pcb->local_ip = *ipaddr;
dcoban	0:1a61c61d0845	446	}
dcoban	0:1a61c61d0845	447	pcb->local_port = port;
dcoban	0:1a61c61d0845	448	TCP_REG(&tcp_bound_pcbs, pcb);
dcoban	0:1a61c61d0845	449	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
dcoban	0:1a61c61d0845	450	return ERR_OK;
dcoban	0:1a61c61d0845	451	}
dcoban	0:1a61c61d0845	452	#if LWIP_CALLBACK_API
dcoban	0:1a61c61d0845	453	/**
dcoban	0:1a61c61d0845	454	* Default accept callback if no accept callback is specified by the user.
dcoban	0:1a61c61d0845	455	*/
dcoban	0:1a61c61d0845	456	static err_t
dcoban	0:1a61c61d0845	457	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
dcoban	0:1a61c61d0845	458	{
dcoban	0:1a61c61d0845	459	LWIP_UNUSED_ARG(arg);
dcoban	0:1a61c61d0845	460	LWIP_UNUSED_ARG(pcb);
dcoban	0:1a61c61d0845	461	LWIP_UNUSED_ARG(err);
dcoban	0:1a61c61d0845	462
dcoban	0:1a61c61d0845	463	return ERR_ABRT;
dcoban	0:1a61c61d0845	464	}
dcoban	0:1a61c61d0845	465	#endif /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	466
dcoban	0:1a61c61d0845	467	/**
dcoban	0:1a61c61d0845	468	* Set the state of the connection to be LISTEN, which means that it
dcoban	0:1a61c61d0845	469	* is able to accept incoming connections. The protocol control block
dcoban	0:1a61c61d0845	470	* is reallocated in order to consume less memory. Setting the
dcoban	0:1a61c61d0845	471	* connection to LISTEN is an irreversible process.
dcoban	0:1a61c61d0845	472	*
dcoban	0:1a61c61d0845	473	* @param pcb the original tcp_pcb
dcoban	0:1a61c61d0845	474	* @param backlog the incoming connections queue limit
dcoban	0:1a61c61d0845	475	* @return tcp_pcb used for listening, consumes less memory.
dcoban	0:1a61c61d0845	476	*
dcoban	0:1a61c61d0845	477	* @note The original tcp_pcb is freed. This function therefore has to be
dcoban	0:1a61c61d0845	478	* called like this:
dcoban	0:1a61c61d0845	479	* tpcb = tcp_listen(tpcb);
dcoban	0:1a61c61d0845	480	*/
dcoban	0:1a61c61d0845	481	struct tcp_pcb *
dcoban	0:1a61c61d0845	482	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
dcoban	0:1a61c61d0845	483	{
dcoban	0:1a61c61d0845	484	struct tcp_pcb_listen *lpcb;
dcoban	0:1a61c61d0845	485
dcoban	0:1a61c61d0845	486	LWIP_UNUSED_ARG(backlog);
dcoban	0:1a61c61d0845	487	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
dcoban	0:1a61c61d0845	488
dcoban	0:1a61c61d0845	489	/* already listening? */
dcoban	0:1a61c61d0845	490	if (pcb->state == LISTEN) {
dcoban	0:1a61c61d0845	491	return pcb;
dcoban	0:1a61c61d0845	492	}
dcoban	0:1a61c61d0845	493	#if SO_REUSE
dcoban	0:1a61c61d0845	494	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
dcoban	0:1a61c61d0845	495	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
dcoban	0:1a61c61d0845	496	is declared (listen-/connection-pcb), we have to make sure now that
dcoban	0:1a61c61d0845	497	this port is only used once for every local IP. */
dcoban	0:1a61c61d0845	498	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
dcoban	0:1a61c61d0845	499	if (lpcb->local_port == pcb->local_port) {
dcoban	0:1a61c61d0845	500	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
dcoban	0:1a61c61d0845	501	/* this address/port is already used */
dcoban	0:1a61c61d0845	502	return NULL;
dcoban	0:1a61c61d0845	503	}
dcoban	0:1a61c61d0845	504	}
dcoban	0:1a61c61d0845	505	}
dcoban	0:1a61c61d0845	506	}
dcoban	0:1a61c61d0845	507	#endif /* SO_REUSE */
dcoban	0:1a61c61d0845	508	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
dcoban	0:1a61c61d0845	509	if (lpcb == NULL) {
dcoban	0:1a61c61d0845	510	return NULL;
dcoban	0:1a61c61d0845	511	}
dcoban	0:1a61c61d0845	512	lpcb->callback_arg = pcb->callback_arg;
dcoban	0:1a61c61d0845	513	lpcb->local_port = pcb->local_port;
dcoban	0:1a61c61d0845	514	lpcb->state = LISTEN;
dcoban	0:1a61c61d0845	515	lpcb->prio = pcb->prio;
dcoban	0:1a61c61d0845	516	lpcb->so_options = pcb->so_options;
dcoban	0:1a61c61d0845	517	lpcb->so_options \|= SOF_ACCEPTCONN;
dcoban	0:1a61c61d0845	518	lpcb->ttl = pcb->ttl;
dcoban	0:1a61c61d0845	519	lpcb->tos = pcb->tos;
dcoban	0:1a61c61d0845	520	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
dcoban	0:1a61c61d0845	521	TCP_RMV(&tcp_bound_pcbs, pcb);
dcoban	0:1a61c61d0845	522	memp_free(MEMP_TCP_PCB, pcb);
dcoban	0:1a61c61d0845	523	#if LWIP_CALLBACK_API
dcoban	0:1a61c61d0845	524	lpcb->accept = tcp_accept_null;
dcoban	0:1a61c61d0845	525	#endif /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	526	#if TCP_LISTEN_BACKLOG
dcoban	0:1a61c61d0845	527	lpcb->accepts_pending = 0;
dcoban	0:1a61c61d0845	528	lpcb->backlog = (backlog ? backlog : 1);
dcoban	0:1a61c61d0845	529	#endif /* TCP_LISTEN_BACKLOG */
dcoban	0:1a61c61d0845	530	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
dcoban	0:1a61c61d0845	531	return (struct tcp_pcb *)lpcb;
dcoban	0:1a61c61d0845	532	}
dcoban	0:1a61c61d0845	533
dcoban	0:1a61c61d0845	534	/**
dcoban	0:1a61c61d0845	535	* Update the state that tracks the available window space to advertise.
dcoban	0:1a61c61d0845	536	*
dcoban	0:1a61c61d0845	537	* Returns how much extra window would be advertised if we sent an
dcoban	0:1a61c61d0845	538	* update now.
dcoban	0:1a61c61d0845	539	*/
dcoban	0:1a61c61d0845	540	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
dcoban	0:1a61c61d0845	541	{
dcoban	0:1a61c61d0845	542	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
dcoban	0:1a61c61d0845	543
dcoban	0:1a61c61d0845	544	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
dcoban	0:1a61c61d0845	545	/* we can advertise more window */
dcoban	0:1a61c61d0845	546	pcb->rcv_ann_wnd = pcb->rcv_wnd;
dcoban	0:1a61c61d0845	547	return new_right_edge - pcb->rcv_ann_right_edge;
dcoban	0:1a61c61d0845	548	} else {
dcoban	0:1a61c61d0845	549	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
dcoban	0:1a61c61d0845	550	/* Can happen due to other end sending out of advertised window,
dcoban	0:1a61c61d0845	551	* but within actual available (but not yet advertised) window */
dcoban	0:1a61c61d0845	552	pcb->rcv_ann_wnd = 0;
dcoban	0:1a61c61d0845	553	} else {
dcoban	0:1a61c61d0845	554	/* keep the right edge of window constant */
dcoban	0:1a61c61d0845	555	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
dcoban	0:1a61c61d0845	556	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
dcoban	0:1a61c61d0845	557	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
dcoban	0:1a61c61d0845	558	}
dcoban	0:1a61c61d0845	559	return 0;
dcoban	0:1a61c61d0845	560	}
dcoban	0:1a61c61d0845	561	}
dcoban	0:1a61c61d0845	562
dcoban	0:1a61c61d0845	563	/**
dcoban	0:1a61c61d0845	564	* This function should be called by the application when it has
dcoban	0:1a61c61d0845	565	* processed the data. The purpose is to advertise a larger window
dcoban	0:1a61c61d0845	566	* when the data has been processed.
dcoban	0:1a61c61d0845	567	*
dcoban	0:1a61c61d0845	568	* @param pcb the tcp_pcb for which data is read
dcoban	0:1a61c61d0845	569	* @param len the amount of bytes that have been read by the application
dcoban	0:1a61c61d0845	570	*/
dcoban	0:1a61c61d0845	571	void
dcoban	0:1a61c61d0845	572	tcp_recved(struct tcp_pcb *pcb, u16_t len)
dcoban	0:1a61c61d0845	573	{
dcoban	0:1a61c61d0845	574	int wnd_inflation;
dcoban	0:1a61c61d0845	575
dcoban	0:1a61c61d0845	576	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
dcoban	0:1a61c61d0845	577	len <= 0xffff - pcb->rcv_wnd );
dcoban	0:1a61c61d0845	578
dcoban	0:1a61c61d0845	579	pcb->rcv_wnd += len;
dcoban	0:1a61c61d0845	580	if (pcb->rcv_wnd > TCP_WND) {
dcoban	0:1a61c61d0845	581	pcb->rcv_wnd = TCP_WND;
dcoban	0:1a61c61d0845	582	}
dcoban	0:1a61c61d0845	583
dcoban	0:1a61c61d0845	584	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
dcoban	0:1a61c61d0845	585
dcoban	0:1a61c61d0845	586	/* If the change in the right edge of window is significant (default
dcoban	0:1a61c61d0845	587	* watermark is TCP_WND/4), then send an explicit update now.
dcoban	0:1a61c61d0845	588	* Otherwise wait for a packet to be sent in the normal course of
dcoban	0:1a61c61d0845	589	* events (or more window to be available later) */
dcoban	0:1a61c61d0845	590	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
dcoban	0:1a61c61d0845	591	tcp_ack_now(pcb);
dcoban	0:1a61c61d0845	592	tcp_output(pcb);
dcoban	0:1a61c61d0845	593	}
dcoban	0:1a61c61d0845	594
dcoban	0:1a61c61d0845	595	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
dcoban	0:1a61c61d0845	596	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
dcoban	0:1a61c61d0845	597	}
dcoban	0:1a61c61d0845	598
dcoban	0:1a61c61d0845	599	/**
dcoban	0:1a61c61d0845	600	* A nastly hack featuring 'goto' statements that allocates a
dcoban	0:1a61c61d0845	601	* new TCP local port.
dcoban	0:1a61c61d0845	602	*
dcoban	0:1a61c61d0845	603	* @return a new (free) local TCP port number
dcoban	0:1a61c61d0845	604	*/
dcoban	0:1a61c61d0845	605	static u16_t
dcoban	0:1a61c61d0845	606	tcp_new_port(void)
dcoban	0:1a61c61d0845	607	{
dcoban	0:1a61c61d0845	608	int i;
dcoban	0:1a61c61d0845	609	struct tcp_pcb *pcb;
dcoban	0:1a61c61d0845	610	#ifndef TCP_LOCAL_PORT_RANGE_START
dcoban	0:1a61c61d0845	611	#define TCP_LOCAL_PORT_RANGE_START 4096
dcoban	0:1a61c61d0845	612	#define TCP_LOCAL_PORT_RANGE_END 0x7fff
dcoban	0:1a61c61d0845	613	#endif
dcoban	0:1a61c61d0845	614	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
dcoban	0:1a61c61d0845	615
dcoban	0:1a61c61d0845	616	again:
dcoban	0:1a61c61d0845	617	if (++port > TCP_LOCAL_PORT_RANGE_END) {
dcoban	0:1a61c61d0845	618	port = TCP_LOCAL_PORT_RANGE_START;
dcoban	0:1a61c61d0845	619	}
dcoban	0:1a61c61d0845	620	/* Check all PCB lists. */
dcoban	0:1a61c61d0845	621	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
dcoban	0:1a61c61d0845	622	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
dcoban	0:1a61c61d0845	623	if (pcb->local_port == port) {
dcoban	0:1a61c61d0845	624	goto again;
dcoban	0:1a61c61d0845	625	}
dcoban	0:1a61c61d0845	626	}
dcoban	0:1a61c61d0845	627	}
dcoban	0:1a61c61d0845	628	return port;
dcoban	0:1a61c61d0845	629	}
dcoban	0:1a61c61d0845	630
dcoban	0:1a61c61d0845	631	/**
dcoban	0:1a61c61d0845	632	* Connects to another host. The function given as the "connected"
dcoban	0:1a61c61d0845	633	* argument will be called when the connection has been established.
dcoban	0:1a61c61d0845	634	*
dcoban	0:1a61c61d0845	635	* @param pcb the tcp_pcb used to establish the connection
dcoban	0:1a61c61d0845	636	* @param ipaddr the remote ip address to connect to
dcoban	0:1a61c61d0845	637	* @param port the remote tcp port to connect to
dcoban	0:1a61c61d0845	638	* @param connected callback function to call when connected (or on error)
dcoban	0:1a61c61d0845	639	* @return ERR_VAL if invalid arguments are given
dcoban	0:1a61c61d0845	640	* ERR_OK if connect request has been sent
dcoban	0:1a61c61d0845	641	* other err_t values if connect request couldn't be sent
dcoban	0:1a61c61d0845	642	*/
dcoban	0:1a61c61d0845	643	err_t
dcoban	0:1a61c61d0845	644	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
dcoban	0:1a61c61d0845	645	tcp_connected_fn connected)
dcoban	0:1a61c61d0845	646	{
dcoban	0:1a61c61d0845	647	err_t ret;
dcoban	0:1a61c61d0845	648	u32_t iss;
dcoban	0:1a61c61d0845	649
dcoban	0:1a61c61d0845	650	LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
dcoban	0:1a61c61d0845	651
dcoban	0:1a61c61d0845	652	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
dcoban	0:1a61c61d0845	653	if (ipaddr != NULL) {
dcoban	0:1a61c61d0845	654	pcb->remote_ip = *ipaddr;
dcoban	0:1a61c61d0845	655	} else {
dcoban	0:1a61c61d0845	656	return ERR_VAL;
dcoban	0:1a61c61d0845	657	}
dcoban	0:1a61c61d0845	658	pcb->remote_port = port;
dcoban	0:1a61c61d0845	659
dcoban	0:1a61c61d0845	660	/* check if we have a route to the remote host */
dcoban	0:1a61c61d0845	661	if (ip_addr_isany(&(pcb->local_ip))) {
dcoban	0:1a61c61d0845	662	/* no local IP address set, yet. */
dcoban	0:1a61c61d0845	663	struct netif *netif = ip_route(&(pcb->remote_ip));
dcoban	0:1a61c61d0845	664	if (netif == NULL) {
dcoban	0:1a61c61d0845	665	/* Don't even try to send a SYN packet if we have no route
dcoban	0:1a61c61d0845	666	since that will fail. */
dcoban	0:1a61c61d0845	667	return ERR_RTE;
dcoban	0:1a61c61d0845	668	}
dcoban	0:1a61c61d0845	669	/* Use the netif's IP address as local address. */
dcoban	0:1a61c61d0845	670	ip_addr_copy(pcb->local_ip, netif->ip_addr);
dcoban	0:1a61c61d0845	671	}
dcoban	0:1a61c61d0845	672
dcoban	0:1a61c61d0845	673	if (pcb->local_port == 0) {
dcoban	0:1a61c61d0845	674	pcb->local_port = tcp_new_port();
dcoban	0:1a61c61d0845	675	}
dcoban	0:1a61c61d0845	676	#if SO_REUSE
dcoban	0:1a61c61d0845	677	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
dcoban	0:1a61c61d0845	678	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
dcoban	0:1a61c61d0845	679	now that the 5-tuple is unique. */
dcoban	0:1a61c61d0845	680	struct tcp_pcb *cpcb;
dcoban	0:1a61c61d0845	681	int i;
dcoban	0:1a61c61d0845	682	/* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
dcoban	0:1a61c61d0845	683	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
dcoban	0:1a61c61d0845	684	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
dcoban	0:1a61c61d0845	685	if ((cpcb->local_port == pcb->local_port) &&
dcoban	0:1a61c61d0845	686	(cpcb->remote_port == port) &&
dcoban	0:1a61c61d0845	687	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
dcoban	0:1a61c61d0845	688	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
dcoban	0:1a61c61d0845	689	/* linux returns EISCONN here, but ERR_USE should be OK for us */
dcoban	0:1a61c61d0845	690	return ERR_USE;
dcoban	0:1a61c61d0845	691	}
dcoban	0:1a61c61d0845	692	}
dcoban	0:1a61c61d0845	693	}
dcoban	0:1a61c61d0845	694	}
dcoban	0:1a61c61d0845	695	#endif /* SO_REUSE */
dcoban	0:1a61c61d0845	696	iss = tcp_next_iss();
dcoban	0:1a61c61d0845	697	pcb->rcv_nxt = 0;
dcoban	0:1a61c61d0845	698	pcb->snd_nxt = iss;
dcoban	0:1a61c61d0845	699	pcb->lastack = iss - 1;
dcoban	0:1a61c61d0845	700	pcb->snd_lbb = iss - 1;
dcoban	0:1a61c61d0845	701	pcb->rcv_wnd = TCP_WND;
dcoban	0:1a61c61d0845	702	pcb->rcv_ann_wnd = TCP_WND;
dcoban	0:1a61c61d0845	703	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
dcoban	0:1a61c61d0845	704	pcb->snd_wnd = TCP_WND;
dcoban	0:1a61c61d0845	705	/* As initial send MSS, we use TCP_MSS but limit it to 536.
dcoban	0:1a61c61d0845	706	The send MSS is updated when an MSS option is received. */
dcoban	0:1a61c61d0845	707	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
dcoban	0:1a61c61d0845	708	#if TCP_CALCULATE_EFF_SEND_MSS
dcoban	0:1a61c61d0845	709	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
dcoban	0:1a61c61d0845	710	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
dcoban	0:1a61c61d0845	711	pcb->cwnd = 1;
dcoban	0:1a61c61d0845	712	pcb->ssthresh = pcb->mss * 10;
dcoban	0:1a61c61d0845	713	#if LWIP_CALLBACK_API
dcoban	0:1a61c61d0845	714	pcb->connected = connected;
dcoban	0:1a61c61d0845	715	#else /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	716	LWIP_UNUSED_ARG(connected);
dcoban	0:1a61c61d0845	717	#endif /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	718
dcoban	0:1a61c61d0845	719	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
dcoban	0:1a61c61d0845	720
dcoban	0:1a61c61d0845	721	/* Send a SYN together with the MSS option. */
dcoban	0:1a61c61d0845	722	ret = tcp_enqueue_flags(pcb, TCP_SYN);
dcoban	0:1a61c61d0845	723	if (ret == ERR_OK) {
dcoban	0:1a61c61d0845	724	/* SYN segment was enqueued, changed the pcbs state now */
dcoban	0:1a61c61d0845	725	pcb->state = SYN_SENT;
dcoban	0:1a61c61d0845	726	TCP_RMV(&tcp_bound_pcbs, pcb);
dcoban	0:1a61c61d0845	727	TCP_REG(&tcp_active_pcbs, pcb);
dcoban	0:1a61c61d0845	728	snmp_inc_tcpactiveopens();
dcoban	0:1a61c61d0845	729
dcoban	0:1a61c61d0845	730	tcp_output(pcb);
dcoban	0:1a61c61d0845	731	}
dcoban	0:1a61c61d0845	732	return ret;
dcoban	0:1a61c61d0845	733	}
dcoban	0:1a61c61d0845	734
dcoban	0:1a61c61d0845	735	/**
dcoban	0:1a61c61d0845	736	* Called every 500 ms and implements the retransmission timer and the timer that
dcoban	0:1a61c61d0845	737	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
dcoban	0:1a61c61d0845	738	* various timers such as the inactivity timer in each PCB.
dcoban	0:1a61c61d0845	739	*
dcoban	0:1a61c61d0845	740	* Automatically called from tcp_tmr().
dcoban	0:1a61c61d0845	741	*/
dcoban	0:1a61c61d0845	742	void
dcoban	0:1a61c61d0845	743	tcp_slowtmr(void)
dcoban	0:1a61c61d0845	744	{
dcoban	0:1a61c61d0845	745	struct tcp_pcb pcb, pcb2, *prev;
dcoban	0:1a61c61d0845	746	u16_t eff_wnd;
dcoban	0:1a61c61d0845	747	u8_t pcb_remove; /* flag if a PCB should be removed */
dcoban	0:1a61c61d0845	748	u8_t pcb_reset; /* flag if a RST should be sent when removing */
dcoban	0:1a61c61d0845	749	err_t err;
dcoban	0:1a61c61d0845	750
dcoban	0:1a61c61d0845	751	tcp_debug_print_pcbs(); //DG
dcoban	0:1a61c61d0845	752
dcoban	0:1a61c61d0845	753	err = ERR_OK;
dcoban	0:1a61c61d0845	754
dcoban	0:1a61c61d0845	755	++tcp_ticks;
dcoban	0:1a61c61d0845	756	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
dcoban	0:1a61c61d0845	757
dcoban	0:1a61c61d0845	758	/* Steps through all of the active PCBs. */
dcoban	0:1a61c61d0845	759	prev = NULL;
dcoban	0:1a61c61d0845	760	pcb = tcp_active_pcbs;
dcoban	0:1a61c61d0845	761	if (pcb == NULL) {
dcoban	0:1a61c61d0845	762	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
dcoban	0:1a61c61d0845	763	}
dcoban	0:1a61c61d0845	764	while (pcb != NULL) {
dcoban	0:1a61c61d0845	765	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
dcoban	0:1a61c61d0845	766	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
dcoban	0:1a61c61d0845	767	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
dcoban	0:1a61c61d0845	768	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
dcoban	0:1a61c61d0845	769
dcoban	0:1a61c61d0845	770	pcb_remove = 0;
dcoban	0:1a61c61d0845	771	pcb_reset = 0;
dcoban	0:1a61c61d0845	772
dcoban	0:1a61c61d0845	773	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
dcoban	0:1a61c61d0845	774	++pcb_remove;
dcoban	0:1a61c61d0845	775	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
dcoban	0:1a61c61d0845	776	}
dcoban	0:1a61c61d0845	777	else if (pcb->nrtx == TCP_MAXRTX) {
dcoban	0:1a61c61d0845	778	++pcb_remove;
dcoban	0:1a61c61d0845	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
dcoban	0:1a61c61d0845	780	} else {
dcoban	0:1a61c61d0845	781	if (pcb->persist_backoff > 0) {
dcoban	0:1a61c61d0845	782	/* If snd_wnd is zero, use persist timer to send 1 byte probes
dcoban	0:1a61c61d0845	783	* instead of using the standard retransmission mechanism. */
dcoban	0:1a61c61d0845	784	pcb->persist_cnt++;
dcoban	0:1a61c61d0845	785	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
dcoban	0:1a61c61d0845	786	pcb->persist_cnt = 0;
dcoban	0:1a61c61d0845	787	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
dcoban	0:1a61c61d0845	788	pcb->persist_backoff++;
dcoban	0:1a61c61d0845	789	}
dcoban	0:1a61c61d0845	790	tcp_zero_window_probe(pcb);
dcoban	0:1a61c61d0845	791	}
dcoban	0:1a61c61d0845	792	} else {
dcoban	0:1a61c61d0845	793	/* Increase the retransmission timer if it is running */
dcoban	0:1a61c61d0845	794	if(pcb->rtime >= 0)
dcoban	0:1a61c61d0845	795	++pcb->rtime;
dcoban	0:1a61c61d0845	796
dcoban	0:1a61c61d0845	797	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
dcoban	0:1a61c61d0845	798	/* Time for a retransmission. */
dcoban	0:1a61c61d0845	799	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
dcoban	0:1a61c61d0845	800	" pcb->rto %"S16_F"\n",
dcoban	0:1a61c61d0845	801	pcb->rtime, pcb->rto));
dcoban	0:1a61c61d0845	802
dcoban	0:1a61c61d0845	803	/* Double retransmission time-out unless we are trying to
dcoban	0:1a61c61d0845	804	* connect to somebody (i.e., we are in SYN_SENT). */
dcoban	0:1a61c61d0845	805	if (pcb->state != SYN_SENT) {
dcoban	0:1a61c61d0845	806	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
dcoban	0:1a61c61d0845	807	}
dcoban	0:1a61c61d0845	808
dcoban	0:1a61c61d0845	809	/* Reset the retransmission timer. */
dcoban	0:1a61c61d0845	810	pcb->rtime = 0;
dcoban	0:1a61c61d0845	811
dcoban	0:1a61c61d0845	812	/* Reduce congestion window and ssthresh. */
dcoban	0:1a61c61d0845	813	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
dcoban	0:1a61c61d0845	814	pcb->ssthresh = eff_wnd >> 1;
dcoban	0:1a61c61d0845	815	if (pcb->ssthresh < (pcb->mss << 1)) {
dcoban	0:1a61c61d0845	816	pcb->ssthresh = (pcb->mss << 1);
dcoban	0:1a61c61d0845	817	}
dcoban	0:1a61c61d0845	818	pcb->cwnd = pcb->mss;
dcoban	0:1a61c61d0845	819	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
dcoban	0:1a61c61d0845	820	" ssthresh %"U16_F"\n",
dcoban	0:1a61c61d0845	821	pcb->cwnd, pcb->ssthresh));
dcoban	0:1a61c61d0845	822
dcoban	0:1a61c61d0845	823	/* The following needs to be called AFTER cwnd is set to one
dcoban	0:1a61c61d0845	824	mss - STJ */
dcoban	0:1a61c61d0845	825	tcp_rexmit_rto(pcb);
dcoban	0:1a61c61d0845	826	}
dcoban	0:1a61c61d0845	827	}
dcoban	0:1a61c61d0845	828	}
dcoban	0:1a61c61d0845	829	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
dcoban	0:1a61c61d0845	830	if (pcb->state == FIN_WAIT_2) {
dcoban	0:1a61c61d0845	831	if ((u32_t)(tcp_ticks - pcb->tmr) >
dcoban	0:1a61c61d0845	832	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
dcoban	0:1a61c61d0845	833	++pcb_remove;
dcoban	0:1a61c61d0845	834	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
dcoban	0:1a61c61d0845	835	}
dcoban	0:1a61c61d0845	836	}
dcoban	0:1a61c61d0845	837
dcoban	0:1a61c61d0845	838	/* Check if KEEPALIVE should be sent */
dcoban	0:1a61c61d0845	839	if((pcb->so_options & SOF_KEEPALIVE) &&
dcoban	0:1a61c61d0845	840	((pcb->state == ESTABLISHED) \|\|
dcoban	0:1a61c61d0845	841	(pcb->state == CLOSE_WAIT))) {
dcoban	0:1a61c61d0845	842	#if LWIP_TCP_KEEPALIVE
dcoban	0:1a61c61d0845	843	if((u32_t)(tcp_ticks - pcb->tmr) >
dcoban	0:1a61c61d0845	844	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
dcoban	0:1a61c61d0845	845	/ TCP_SLOW_INTERVAL)
dcoban	0:1a61c61d0845	846	#else
dcoban	0:1a61c61d0845	847	if((u32_t)(tcp_ticks - pcb->tmr) >
dcoban	0:1a61c61d0845	848	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
dcoban	0:1a61c61d0845	849	#endif /* LWIP_TCP_KEEPALIVE */
dcoban	0:1a61c61d0845	850	{
dcoban	0:1a61c61d0845	851	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
dcoban	0:1a61c61d0845	852	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
dcoban	0:1a61c61d0845	853	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
dcoban	0:1a61c61d0845	854
dcoban	0:1a61c61d0845	855	++pcb_remove;
dcoban	0:1a61c61d0845	856	++pcb_reset;
dcoban	0:1a61c61d0845	857	}
dcoban	0:1a61c61d0845	858	#if LWIP_TCP_KEEPALIVE
dcoban	0:1a61c61d0845	859	else if((u32_t)(tcp_ticks - pcb->tmr) >
dcoban	0:1a61c61d0845	860	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
dcoban	0:1a61c61d0845	861	/ TCP_SLOW_INTERVAL)
dcoban	0:1a61c61d0845	862	#else
dcoban	0:1a61c61d0845	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
dcoban	0:1a61c61d0845	864	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
dcoban	0:1a61c61d0845	865	/ TCP_SLOW_INTERVAL)
dcoban	0:1a61c61d0845	866	#endif /* LWIP_TCP_KEEPALIVE */
dcoban	0:1a61c61d0845	867	{
dcoban	0:1a61c61d0845	868	tcp_keepalive(pcb);
dcoban	0:1a61c61d0845	869	pcb->keep_cnt_sent++;
dcoban	0:1a61c61d0845	870	}
dcoban	0:1a61c61d0845	871	}
dcoban	0:1a61c61d0845	872
dcoban	0:1a61c61d0845	873	/* If this PCB has queued out of sequence data, but has been
dcoban	0:1a61c61d0845	874	inactive for too long, will drop the data (it will eventually
dcoban	0:1a61c61d0845	875	be retransmitted). */
dcoban	0:1a61c61d0845	876	#if TCP_QUEUE_OOSEQ
dcoban	0:1a61c61d0845	877	if (pcb->ooseq != NULL &&
dcoban	0:1a61c61d0845	878	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
dcoban	0:1a61c61d0845	879	tcp_segs_free(pcb->ooseq);
dcoban	0:1a61c61d0845	880	pcb->ooseq = NULL;
dcoban	0:1a61c61d0845	881	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
dcoban	0:1a61c61d0845	882	}
dcoban	0:1a61c61d0845	883	#endif /* TCP_QUEUE_OOSEQ */
dcoban	0:1a61c61d0845	884
dcoban	0:1a61c61d0845	885	/* Check if this PCB has stayed too long in SYN-RCVD */
dcoban	0:1a61c61d0845	886	if (pcb->state == SYN_RCVD) {
dcoban	0:1a61c61d0845	887	if ((u32_t)(tcp_ticks - pcb->tmr) >
dcoban	0:1a61c61d0845	888	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
dcoban	0:1a61c61d0845	889	++pcb_remove;
dcoban	0:1a61c61d0845	890	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
dcoban	0:1a61c61d0845	891	}
dcoban	0:1a61c61d0845	892	}
dcoban	0:1a61c61d0845	893
dcoban	0:1a61c61d0845	894	/* Check if this PCB has stayed too long in LAST-ACK */
dcoban	0:1a61c61d0845	895	if (pcb->state == LAST_ACK) {
dcoban	0:1a61c61d0845	896	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
dcoban	0:1a61c61d0845	897	++pcb_remove;
dcoban	0:1a61c61d0845	898	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
dcoban	0:1a61c61d0845	899	}
dcoban	0:1a61c61d0845	900	}
dcoban	0:1a61c61d0845	901
dcoban	0:1a61c61d0845	902	/* If the PCB should be removed, do it. */
dcoban	0:1a61c61d0845	903	if (pcb_remove) {
dcoban	0:1a61c61d0845	904	tcp_pcb_purge(pcb);
dcoban	0:1a61c61d0845	905	/* Remove PCB from tcp_active_pcbs list. */
dcoban	0:1a61c61d0845	906	if (prev != NULL) {
dcoban	0:1a61c61d0845	907	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
dcoban	0:1a61c61d0845	908	prev->next = pcb->next;
dcoban	0:1a61c61d0845	909	} else {
dcoban	0:1a61c61d0845	910	/* This PCB was the first. */
dcoban	0:1a61c61d0845	911	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
dcoban	0:1a61c61d0845	912	tcp_active_pcbs = pcb->next;
dcoban	0:1a61c61d0845	913	}
dcoban	0:1a61c61d0845	914
dcoban	0:1a61c61d0845	915	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
dcoban	0:1a61c61d0845	916	if (pcb_reset) {
dcoban	0:1a61c61d0845	917	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
dcoban	0:1a61c61d0845	918	pcb->local_port, pcb->remote_port);
dcoban	0:1a61c61d0845	919	}
dcoban	0:1a61c61d0845	920
dcoban	0:1a61c61d0845	921	pcb2 = pcb->next;
dcoban	0:1a61c61d0845	922	memp_free(MEMP_TCP_PCB, pcb);
dcoban	0:1a61c61d0845	923	pcb = pcb2;
dcoban	0:1a61c61d0845	924	} else {
dcoban	0:1a61c61d0845	925	/* get the 'next' element now and work with 'prev' below (in case of abort) */
dcoban	0:1a61c61d0845	926	prev = pcb;
dcoban	0:1a61c61d0845	927	pcb = pcb->next;
dcoban	0:1a61c61d0845	928
dcoban	0:1a61c61d0845	929	/* We check if we should poll the connection. */
dcoban	0:1a61c61d0845	930	++prev->polltmr;
dcoban	0:1a61c61d0845	931	if (prev->polltmr >= prev->pollinterval) {
dcoban	0:1a61c61d0845	932	prev->polltmr = 0;
dcoban	0:1a61c61d0845	933	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
dcoban	0:1a61c61d0845	934	TCP_EVENT_POLL(prev, err);
dcoban	0:1a61c61d0845	935	/* if err == ERR_ABRT, 'prev' is already deallocated */
dcoban	0:1a61c61d0845	936	if (err == ERR_OK) {
dcoban	0:1a61c61d0845	937	tcp_output(prev);
dcoban	0:1a61c61d0845	938	}
dcoban	0:1a61c61d0845	939	}
dcoban	0:1a61c61d0845	940	}
dcoban	0:1a61c61d0845	941	}
dcoban	0:1a61c61d0845	942
dcoban	0:1a61c61d0845	943
dcoban	0:1a61c61d0845	944	/* Steps through all of the TIME-WAIT PCBs. */
dcoban	0:1a61c61d0845	945	prev = NULL;
dcoban	0:1a61c61d0845	946	pcb = tcp_tw_pcbs;
dcoban	0:1a61c61d0845	947	while (pcb != NULL) {
dcoban	0:1a61c61d0845	948	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
dcoban	0:1a61c61d0845	949	pcb_remove = 0;
dcoban	0:1a61c61d0845	950
dcoban	0:1a61c61d0845	951	/* Check if this PCB has stayed long enough in TIME-WAIT */
dcoban	0:1a61c61d0845	952	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
dcoban	0:1a61c61d0845	953	++pcb_remove;
dcoban	0:1a61c61d0845	954	}
dcoban	0:1a61c61d0845	955
dcoban	0:1a61c61d0845	956
dcoban	0:1a61c61d0845	957
dcoban	0:1a61c61d0845	958	/* If the PCB should be removed, do it. */
dcoban	0:1a61c61d0845	959	if (pcb_remove) {
dcoban	0:1a61c61d0845	960	tcp_pcb_purge(pcb);
dcoban	0:1a61c61d0845	961	/* Remove PCB from tcp_tw_pcbs list. */
dcoban	0:1a61c61d0845	962	if (prev != NULL) {
dcoban	0:1a61c61d0845	963	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
dcoban	0:1a61c61d0845	964	prev->next = pcb->next;
dcoban	0:1a61c61d0845	965	} else {
dcoban	0:1a61c61d0845	966	/* This PCB was the first. */
dcoban	0:1a61c61d0845	967	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
dcoban	0:1a61c61d0845	968	tcp_tw_pcbs = pcb->next;
dcoban	0:1a61c61d0845	969	}
dcoban	0:1a61c61d0845	970	pcb2 = pcb->next;
dcoban	0:1a61c61d0845	971	memp_free(MEMP_TCP_PCB, pcb);
dcoban	0:1a61c61d0845	972	pcb = pcb2;
dcoban	0:1a61c61d0845	973	} else {
dcoban	0:1a61c61d0845	974	prev = pcb;
dcoban	0:1a61c61d0845	975	pcb = pcb->next;
dcoban	0:1a61c61d0845	976	}
dcoban	0:1a61c61d0845	977	}
dcoban	0:1a61c61d0845	978	}
dcoban	0:1a61c61d0845	979
dcoban	0:1a61c61d0845	980	/**
dcoban	0:1a61c61d0845	981	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
dcoban	0:1a61c61d0845	982	* "refused" by upper layer (application) and sends delayed ACKs.
dcoban	0:1a61c61d0845	983	*
dcoban	0:1a61c61d0845	984	* Automatically called from tcp_tmr().
dcoban	0:1a61c61d0845	985	*/
dcoban	0:1a61c61d0845	986	void
dcoban	0:1a61c61d0845	987	tcp_fasttmr(void)
dcoban	0:1a61c61d0845	988	{
dcoban	0:1a61c61d0845	989	struct tcp_pcb *pcb = tcp_active_pcbs;
dcoban	0:1a61c61d0845	990
dcoban	0:1a61c61d0845	991	while(pcb != NULL) {
dcoban	0:1a61c61d0845	992	struct tcp_pcb *next = pcb->next;
dcoban	0:1a61c61d0845	993	/* If there is data which was previously "refused" by upper layer */
dcoban	0:1a61c61d0845	994	if (pcb->refused_data != NULL) {
dcoban	0:1a61c61d0845	995	/* Notify again application with data previously received. */
dcoban	0:1a61c61d0845	996	err_t err;
dcoban	0:1a61c61d0845	997	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
dcoban	0:1a61c61d0845	998	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
dcoban	0:1a61c61d0845	999	if (err == ERR_OK) {
dcoban	0:1a61c61d0845	1000	pcb->refused_data = NULL;
dcoban	0:1a61c61d0845	1001	} else if (err == ERR_ABRT) {
dcoban	0:1a61c61d0845	1002	/* if err == ERR_ABRT, 'pcb' is already deallocated */
dcoban	0:1a61c61d0845	1003	pcb = NULL;
dcoban	0:1a61c61d0845	1004	}
dcoban	0:1a61c61d0845	1005	}
dcoban	0:1a61c61d0845	1006
dcoban	0:1a61c61d0845	1007	/* send delayed ACKs */
dcoban	0:1a61c61d0845	1008	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
dcoban	0:1a61c61d0845	1009	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
dcoban	0:1a61c61d0845	1010	tcp_ack_now(pcb);
dcoban	0:1a61c61d0845	1011	tcp_output(pcb);
dcoban	0:1a61c61d0845	1012	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
dcoban	0:1a61c61d0845	1013	}
dcoban	0:1a61c61d0845	1014
dcoban	0:1a61c61d0845	1015	pcb = next;
dcoban	0:1a61c61d0845	1016	}
dcoban	0:1a61c61d0845	1017	}
dcoban	0:1a61c61d0845	1018
dcoban	0:1a61c61d0845	1019	/**
dcoban	0:1a61c61d0845	1020	* Deallocates a list of TCP segments (tcp_seg structures).
dcoban	0:1a61c61d0845	1021	*
dcoban	0:1a61c61d0845	1022	* @param seg tcp_seg list of TCP segments to free
dcoban	0:1a61c61d0845	1023	*/
dcoban	0:1a61c61d0845	1024	void
dcoban	0:1a61c61d0845	1025	tcp_segs_free(struct tcp_seg *seg)
dcoban	0:1a61c61d0845	1026	{
dcoban	0:1a61c61d0845	1027	while (seg != NULL) {
dcoban	0:1a61c61d0845	1028	struct tcp_seg *next = seg->next;
dcoban	0:1a61c61d0845	1029	tcp_seg_free(seg);
dcoban	0:1a61c61d0845	1030	seg = next;
dcoban	0:1a61c61d0845	1031	}
dcoban	0:1a61c61d0845	1032	}
dcoban	0:1a61c61d0845	1033
dcoban	0:1a61c61d0845	1034	/**
dcoban	0:1a61c61d0845	1035	* Frees a TCP segment (tcp_seg structure).
dcoban	0:1a61c61d0845	1036	*
dcoban	0:1a61c61d0845	1037	* @param seg single tcp_seg to free
dcoban	0:1a61c61d0845	1038	*/
dcoban	0:1a61c61d0845	1039	void
dcoban	0:1a61c61d0845	1040	tcp_seg_free(struct tcp_seg *seg)
dcoban	0:1a61c61d0845	1041	{
dcoban	0:1a61c61d0845	1042	if (seg != NULL) {
dcoban	0:1a61c61d0845	1043	if (seg->p != NULL) {
dcoban	0:1a61c61d0845	1044	pbuf_free(seg->p);
dcoban	0:1a61c61d0845	1045	#if TCP_DEBUG
dcoban	0:1a61c61d0845	1046	seg->p = NULL;
dcoban	0:1a61c61d0845	1047	#endif /* TCP_DEBUG */
dcoban	0:1a61c61d0845	1048	}
dcoban	0:1a61c61d0845	1049	memp_free(MEMP_TCP_SEG, seg);
dcoban	0:1a61c61d0845	1050	}
dcoban	0:1a61c61d0845	1051	}
dcoban	0:1a61c61d0845	1052
dcoban	0:1a61c61d0845	1053	/**
dcoban	0:1a61c61d0845	1054	* Sets the priority of a connection.
dcoban	0:1a61c61d0845	1055	*
dcoban	0:1a61c61d0845	1056	* @param pcb the tcp_pcb to manipulate
dcoban	0:1a61c61d0845	1057	* @param prio new priority
dcoban	0:1a61c61d0845	1058	*/
dcoban	0:1a61c61d0845	1059	void
dcoban	0:1a61c61d0845	1060	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
dcoban	0:1a61c61d0845	1061	{
dcoban	0:1a61c61d0845	1062	pcb->prio = prio;
dcoban	0:1a61c61d0845	1063	}
dcoban	0:1a61c61d0845	1064
dcoban	0:1a61c61d0845	1065	#if TCP_QUEUE_OOSEQ
dcoban	0:1a61c61d0845	1066	/**
dcoban	0:1a61c61d0845	1067	* Returns a copy of the given TCP segment.
dcoban	0:1a61c61d0845	1068	* The pbuf and data are not copied, only the pointers
dcoban	0:1a61c61d0845	1069	*
dcoban	0:1a61c61d0845	1070	* @param seg the old tcp_seg
dcoban	0:1a61c61d0845	1071	* @return a copy of seg
dcoban	0:1a61c61d0845	1072	*/
dcoban	0:1a61c61d0845	1073	struct tcp_seg *
dcoban	0:1a61c61d0845	1074	tcp_seg_copy(struct tcp_seg *seg)
dcoban	0:1a61c61d0845	1075	{
dcoban	0:1a61c61d0845	1076	struct tcp_seg *cseg;
dcoban	0:1a61c61d0845	1077
dcoban	0:1a61c61d0845	1078	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
dcoban	0:1a61c61d0845	1079	if (cseg == NULL) {
dcoban	0:1a61c61d0845	1080	return NULL;
dcoban	0:1a61c61d0845	1081	}
dcoban	0:1a61c61d0845	1082	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
dcoban	0:1a61c61d0845	1083	pbuf_ref(cseg->p);
dcoban	0:1a61c61d0845	1084	return cseg;
dcoban	0:1a61c61d0845	1085	}
dcoban	0:1a61c61d0845	1086	#endif /* TCP_QUEUE_OOSEQ */
dcoban	0:1a61c61d0845	1087
dcoban	0:1a61c61d0845	1088	#if LWIP_CALLBACK_API
dcoban	0:1a61c61d0845	1089	/**
dcoban	0:1a61c61d0845	1090	* Default receive callback that is called if the user didn't register
dcoban	0:1a61c61d0845	1091	* a recv callback for the pcb.
dcoban	0:1a61c61d0845	1092	*/
dcoban	0:1a61c61d0845	1093	err_t
dcoban	0:1a61c61d0845	1094	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
dcoban	0:1a61c61d0845	1095	{
dcoban	0:1a61c61d0845	1096	LWIP_UNUSED_ARG(arg);
dcoban	0:1a61c61d0845	1097	if (p != NULL) {
dcoban	0:1a61c61d0845	1098	tcp_recved(pcb, p->tot_len);
dcoban	0:1a61c61d0845	1099	pbuf_free(p);
dcoban	0:1a61c61d0845	1100	} else if (err == ERR_OK) {
dcoban	0:1a61c61d0845	1101	return tcp_close(pcb);
dcoban	0:1a61c61d0845	1102	}
dcoban	0:1a61c61d0845	1103	return ERR_OK;
dcoban	0:1a61c61d0845	1104	}
dcoban	0:1a61c61d0845	1105	#endif /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	1106
dcoban	0:1a61c61d0845	1107	/**
dcoban	0:1a61c61d0845	1108	* Kills the oldest active connection that has lower priority than prio.
dcoban	0:1a61c61d0845	1109	*
dcoban	0:1a61c61d0845	1110	* @param prio minimum priority
dcoban	0:1a61c61d0845	1111	*/
dcoban	0:1a61c61d0845	1112	static void
dcoban	0:1a61c61d0845	1113	tcp_kill_prio(u8_t prio)
dcoban	0:1a61c61d0845	1114	{
dcoban	0:1a61c61d0845	1115	struct tcp_pcb pcb, inactive;
dcoban	0:1a61c61d0845	1116	u32_t inactivity;
dcoban	0:1a61c61d0845	1117	u8_t mprio;
dcoban	0:1a61c61d0845	1118
dcoban	0:1a61c61d0845	1119
dcoban	0:1a61c61d0845	1120	mprio = TCP_PRIO_MAX;
dcoban	0:1a61c61d0845	1121
dcoban	0:1a61c61d0845	1122	/* We kill the oldest active connection that has lower priority than prio. */
dcoban	0:1a61c61d0845	1123	inactivity = 0;
dcoban	0:1a61c61d0845	1124	inactive = NULL;
dcoban	0:1a61c61d0845	1125	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
dcoban	0:1a61c61d0845	1126	if (pcb->prio < prio &&
dcoban	0:1a61c61d0845	1127	pcb->prio <= mprio &&
dcoban	0:1a61c61d0845	1128	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
dcoban	0:1a61c61d0845	1129	inactivity = tcp_ticks - pcb->tmr;
dcoban	0:1a61c61d0845	1130	inactive = pcb;
dcoban	0:1a61c61d0845	1131	mprio = pcb->prio;
dcoban	0:1a61c61d0845	1132	}
dcoban	0:1a61c61d0845	1133	}
dcoban	0:1a61c61d0845	1134	if (inactive != NULL) {
dcoban	0:1a61c61d0845	1135	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
dcoban	0:1a61c61d0845	1136	(void *)inactive, inactivity));
dcoban	0:1a61c61d0845	1137	tcp_abort(inactive);
dcoban	0:1a61c61d0845	1138	}
dcoban	0:1a61c61d0845	1139	}
dcoban	0:1a61c61d0845	1140
dcoban	0:1a61c61d0845	1141	/**
dcoban	0:1a61c61d0845	1142	* Kills the oldest connection that is in TIME_WAIT state.
dcoban	0:1a61c61d0845	1143	* Called from tcp_alloc() if no more connections are available.
dcoban	0:1a61c61d0845	1144	*/
dcoban	0:1a61c61d0845	1145	static void
dcoban	0:1a61c61d0845	1146	tcp_kill_timewait(void)
dcoban	0:1a61c61d0845	1147	{
dcoban	0:1a61c61d0845	1148	struct tcp_pcb pcb, inactive;
dcoban	0:1a61c61d0845	1149	u32_t inactivity;
dcoban	0:1a61c61d0845	1150
dcoban	0:1a61c61d0845	1151	inactivity = 0;
dcoban	0:1a61c61d0845	1152	inactive = NULL;
dcoban	0:1a61c61d0845	1153	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
dcoban	0:1a61c61d0845	1154	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
dcoban	0:1a61c61d0845	1155	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
dcoban	0:1a61c61d0845	1156	inactivity = tcp_ticks - pcb->tmr;
dcoban	0:1a61c61d0845	1157	inactive = pcb;
dcoban	0:1a61c61d0845	1158	}
dcoban	0:1a61c61d0845	1159	}
dcoban	0:1a61c61d0845	1160	if (inactive != NULL) {
dcoban	0:1a61c61d0845	1161	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
dcoban	0:1a61c61d0845	1162	(void *)inactive, inactivity));
dcoban	0:1a61c61d0845	1163	tcp_abort(inactive);
dcoban	0:1a61c61d0845	1164	}
dcoban	0:1a61c61d0845	1165	}
dcoban	0:1a61c61d0845	1166
dcoban	0:1a61c61d0845	1167	/**
dcoban	0:1a61c61d0845	1168	* Allocate a new tcp_pcb structure.
dcoban	0:1a61c61d0845	1169	*
dcoban	0:1a61c61d0845	1170	* @param prio priority for the new pcb
dcoban	0:1a61c61d0845	1171	* @return a new tcp_pcb that initially is in state CLOSED
dcoban	0:1a61c61d0845	1172	*/
dcoban	0:1a61c61d0845	1173	struct tcp_pcb *
dcoban	0:1a61c61d0845	1174	tcp_alloc(u8_t prio)
dcoban	0:1a61c61d0845	1175	{
dcoban	0:1a61c61d0845	1176	struct tcp_pcb *pcb;
dcoban	0:1a61c61d0845	1177	u32_t iss;
dcoban	0:1a61c61d0845	1178
dcoban	0:1a61c61d0845	1179	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
dcoban	0:1a61c61d0845	1180	if (pcb == NULL) {
dcoban	0:1a61c61d0845	1181	/* Try killing oldest connection in TIME-WAIT. */
dcoban	0:1a61c61d0845	1182	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
dcoban	0:1a61c61d0845	1183	tcp_kill_timewait();
dcoban	0:1a61c61d0845	1184	/* Try to allocate a tcp_pcb again. */
dcoban	0:1a61c61d0845	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
dcoban	0:1a61c61d0845	1186	if (pcb == NULL) {
dcoban	0:1a61c61d0845	1187	/* Try killing active connections with lower priority than the new one. */
dcoban	0:1a61c61d0845	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
dcoban	0:1a61c61d0845	1189	tcp_kill_prio(prio);
dcoban	0:1a61c61d0845	1190	/* Try to allocate a tcp_pcb again. */
dcoban	0:1a61c61d0845	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
dcoban	0:1a61c61d0845	1192	if (pcb != NULL) {
dcoban	0:1a61c61d0845	1193	/* adjust err stats: memp_malloc failed twice before */
dcoban	0:1a61c61d0845	1194	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
dcoban	0:1a61c61d0845	1195	}
dcoban	0:1a61c61d0845	1196	}
dcoban	0:1a61c61d0845	1197	if (pcb != NULL) {
dcoban	0:1a61c61d0845	1198	/* adjust err stats: timewait PCB was freed above */
dcoban	0:1a61c61d0845	1199	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
dcoban	0:1a61c61d0845	1200	}
dcoban	0:1a61c61d0845	1201	}
dcoban	0:1a61c61d0845	1202	if (pcb != NULL) {
dcoban	0:1a61c61d0845	1203	memset(pcb, 0, sizeof(struct tcp_pcb));
dcoban	0:1a61c61d0845	1204	pcb->prio = prio;
dcoban	0:1a61c61d0845	1205	pcb->snd_buf = TCP_SND_BUF;
dcoban	0:1a61c61d0845	1206	pcb->snd_queuelen = 0;
dcoban	0:1a61c61d0845	1207	pcb->rcv_wnd = TCP_WND;
dcoban	0:1a61c61d0845	1208	pcb->rcv_ann_wnd = TCP_WND;
dcoban	0:1a61c61d0845	1209	pcb->tos = 0;
dcoban	0:1a61c61d0845	1210	pcb->ttl = TCP_TTL;
dcoban	0:1a61c61d0845	1211	/* As initial send MSS, we use TCP_MSS but limit it to 536.
dcoban	0:1a61c61d0845	1212	The send MSS is updated when an MSS option is received. */
dcoban	0:1a61c61d0845	1213	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
dcoban	0:1a61c61d0845	1214	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
dcoban	0:1a61c61d0845	1215	pcb->sa = 0;
dcoban	0:1a61c61d0845	1216	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
dcoban	0:1a61c61d0845	1217	pcb->rtime = -1;
dcoban	0:1a61c61d0845	1218	pcb->cwnd = 1;
dcoban	0:1a61c61d0845	1219	iss = tcp_next_iss();
dcoban	0:1a61c61d0845	1220	pcb->snd_wl2 = iss;
dcoban	0:1a61c61d0845	1221	pcb->snd_nxt = iss;
dcoban	0:1a61c61d0845	1222	pcb->lastack = iss;
dcoban	0:1a61c61d0845	1223	pcb->snd_lbb = iss;
dcoban	0:1a61c61d0845	1224	pcb->tmr = tcp_ticks;
dcoban	0:1a61c61d0845	1225
dcoban	0:1a61c61d0845	1226	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
dcoban	0:1a61c61d0845	1227
dcoban	0:1a61c61d0845	1228	pcb->polltmr = 0;
dcoban	0:1a61c61d0845	1229
dcoban	0:1a61c61d0845	1230	#if LWIP_CALLBACK_API
dcoban	0:1a61c61d0845	1231	pcb->recv = tcp_recv_null;
dcoban	0:1a61c61d0845	1232	#endif /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	1233
dcoban	0:1a61c61d0845	1234	/* Init KEEPALIVE timer */
dcoban	0:1a61c61d0845	1235	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
dcoban	0:1a61c61d0845	1236
dcoban	0:1a61c61d0845	1237	#if LWIP_TCP_KEEPALIVE
dcoban	0:1a61c61d0845	1238	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
dcoban	0:1a61c61d0845	1239	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
dcoban	0:1a61c61d0845	1240	#endif /* LWIP_TCP_KEEPALIVE */
dcoban	0:1a61c61d0845	1241
dcoban	0:1a61c61d0845	1242	pcb->keep_cnt_sent = 0;
dcoban	0:1a61c61d0845	1243	}
dcoban	0:1a61c61d0845	1244	return pcb;
dcoban	0:1a61c61d0845	1245	}
dcoban	0:1a61c61d0845	1246
dcoban	0:1a61c61d0845	1247	/**
dcoban	0:1a61c61d0845	1248	* Creates a new TCP protocol control block but doesn't place it on
dcoban	0:1a61c61d0845	1249	* any of the TCP PCB lists.
dcoban	0:1a61c61d0845	1250	* The pcb is not put on any list until binding using tcp_bind().
dcoban	0:1a61c61d0845	1251	*
dcoban	0:1a61c61d0845	1252	* @internal: Maybe there should be a idle TCP PCB list where these
dcoban	0:1a61c61d0845	1253	* PCBs are put on. Port reservation using tcp_bind() is implemented but
dcoban	0:1a61c61d0845	1254	* allocated pcbs that are not bound can't be killed automatically if wanting
dcoban	0:1a61c61d0845	1255	* to allocate a pcb with higher prio (@see tcp_kill_prio())
dcoban	0:1a61c61d0845	1256	*
dcoban	0:1a61c61d0845	1257	* @return a new tcp_pcb that initially is in state CLOSED
dcoban	0:1a61c61d0845	1258	*/
dcoban	0:1a61c61d0845	1259	struct tcp_pcb *
dcoban	0:1a61c61d0845	1260	tcp_new(void)
dcoban	0:1a61c61d0845	1261	{
dcoban	0:1a61c61d0845	1262	return tcp_alloc(TCP_PRIO_NORMAL);
dcoban	0:1a61c61d0845	1263	}
dcoban	0:1a61c61d0845	1264
dcoban	0:1a61c61d0845	1265	/**
dcoban	0:1a61c61d0845	1266	* Used to specify the argument that should be passed callback
dcoban	0:1a61c61d0845	1267	* functions.
dcoban	0:1a61c61d0845	1268	*
dcoban	0:1a61c61d0845	1269	* @param pcb tcp_pcb to set the callback argument
dcoban	0:1a61c61d0845	1270	* @param arg void pointer argument to pass to callback functions
dcoban	0:1a61c61d0845	1271	*/
dcoban	0:1a61c61d0845	1272	void
dcoban	0:1a61c61d0845	1273	tcp_arg(struct tcp_pcb pcb, void arg)
dcoban	0:1a61c61d0845	1274	{
dcoban	0:1a61c61d0845	1275	pcb->callback_arg = arg;
dcoban	0:1a61c61d0845	1276	}
dcoban	0:1a61c61d0845	1277	#if LWIP_CALLBACK_API
dcoban	0:1a61c61d0845	1278
dcoban	0:1a61c61d0845	1279	/**
dcoban	0:1a61c61d0845	1280	* Used to specify the function that should be called when a TCP
dcoban	0:1a61c61d0845	1281	* connection receives data.
dcoban	0:1a61c61d0845	1282	*
dcoban	0:1a61c61d0845	1283	* @param pcb tcp_pcb to set the recv callback
dcoban	0:1a61c61d0845	1284	* @param recv callback function to call for this pcb when data is received
dcoban	0:1a61c61d0845	1285	*/
dcoban	0:1a61c61d0845	1286	void
dcoban	0:1a61c61d0845	1287	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
dcoban	0:1a61c61d0845	1288	{
dcoban	0:1a61c61d0845	1289	pcb->recv = recv;
dcoban	0:1a61c61d0845	1290	}
dcoban	0:1a61c61d0845	1291
dcoban	0:1a61c61d0845	1292	/**
dcoban	0:1a61c61d0845	1293	* Used to specify the function that should be called when TCP data
dcoban	0:1a61c61d0845	1294	* has been successfully delivered to the remote host.
dcoban	0:1a61c61d0845	1295	*
dcoban	0:1a61c61d0845	1296	* @param pcb tcp_pcb to set the sent callback
dcoban	0:1a61c61d0845	1297	* @param sent callback function to call for this pcb when data is successfully sent
dcoban	0:1a61c61d0845	1298	*/
dcoban	0:1a61c61d0845	1299	void
dcoban	0:1a61c61d0845	1300	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
dcoban	0:1a61c61d0845	1301	{
dcoban	0:1a61c61d0845	1302	pcb->sent = sent;
dcoban	0:1a61c61d0845	1303	}
dcoban	0:1a61c61d0845	1304
dcoban	0:1a61c61d0845	1305	/**
dcoban	0:1a61c61d0845	1306	* Used to specify the function that should be called when a fatal error
dcoban	0:1a61c61d0845	1307	* has occured on the connection.
dcoban	0:1a61c61d0845	1308	*
dcoban	0:1a61c61d0845	1309	* @param pcb tcp_pcb to set the err callback
dcoban	0:1a61c61d0845	1310	* @param err callback function to call for this pcb when a fatal error
dcoban	0:1a61c61d0845	1311	* has occured on the connection
dcoban	0:1a61c61d0845	1312	*/
dcoban	0:1a61c61d0845	1313	void
dcoban	0:1a61c61d0845	1314	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
dcoban	0:1a61c61d0845	1315	{
dcoban	0:1a61c61d0845	1316	pcb->errf = err;
dcoban	0:1a61c61d0845	1317	}
dcoban	0:1a61c61d0845	1318
dcoban	0:1a61c61d0845	1319	/**
dcoban	0:1a61c61d0845	1320	* Used for specifying the function that should be called when a
dcoban	0:1a61c61d0845	1321	* LISTENing connection has been connected to another host.
dcoban	0:1a61c61d0845	1322	*
dcoban	0:1a61c61d0845	1323	* @param pcb tcp_pcb to set the accept callback
dcoban	0:1a61c61d0845	1324	* @param accept callback function to call for this pcb when LISTENing
dcoban	0:1a61c61d0845	1325	* connection has been connected to another host
dcoban	0:1a61c61d0845	1326	*/
dcoban	0:1a61c61d0845	1327	void
dcoban	0:1a61c61d0845	1328	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
dcoban	0:1a61c61d0845	1329	{
dcoban	0:1a61c61d0845	1330	pcb->accept = accept;
dcoban	0:1a61c61d0845	1331	}
dcoban	0:1a61c61d0845	1332	#endif /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	1333
dcoban	0:1a61c61d0845	1334
dcoban	0:1a61c61d0845	1335	/**
dcoban	0:1a61c61d0845	1336	* Used to specify the function that should be called periodically
dcoban	0:1a61c61d0845	1337	* from TCP. The interval is specified in terms of the TCP coarse
dcoban	0:1a61c61d0845	1338	* timer interval, which is called twice a second.
dcoban	0:1a61c61d0845	1339	*
dcoban	0:1a61c61d0845	1340	*/
dcoban	0:1a61c61d0845	1341	void
dcoban	0:1a61c61d0845	1342	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
dcoban	0:1a61c61d0845	1343	{
dcoban	0:1a61c61d0845	1344	#if LWIP_CALLBACK_API
dcoban	0:1a61c61d0845	1345	pcb->poll = poll;
dcoban	0:1a61c61d0845	1346	#else /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	1347	LWIP_UNUSED_ARG(poll);
dcoban	0:1a61c61d0845	1348	#endif /* LWIP_CALLBACK_API */
dcoban	0:1a61c61d0845	1349	pcb->pollinterval = interval;
dcoban	0:1a61c61d0845	1350	}
dcoban	0:1a61c61d0845	1351
dcoban	0:1a61c61d0845	1352	/**
dcoban	0:1a61c61d0845	1353	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
dcoban	0:1a61c61d0845	1354	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
dcoban	0:1a61c61d0845	1355	*
dcoban	0:1a61c61d0845	1356	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
dcoban	0:1a61c61d0845	1357	*/
dcoban	0:1a61c61d0845	1358	void
dcoban	0:1a61c61d0845	1359	tcp_pcb_purge(struct tcp_pcb *pcb)
dcoban	0:1a61c61d0845	1360	{
dcoban	0:1a61c61d0845	1361	if (pcb->state != CLOSED &&
dcoban	0:1a61c61d0845	1362	pcb->state != TIME_WAIT &&
dcoban	0:1a61c61d0845	1363	pcb->state != LISTEN) {
dcoban	0:1a61c61d0845	1364
dcoban	0:1a61c61d0845	1365	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
dcoban	0:1a61c61d0845	1366
dcoban	0:1a61c61d0845	1367	#if TCP_LISTEN_BACKLOG
dcoban	0:1a61c61d0845	1368	if (pcb->state == SYN_RCVD) {
dcoban	0:1a61c61d0845	1369	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
dcoban	0:1a61c61d0845	1370	struct tcp_pcb_listen *lpcb;
dcoban	0:1a61c61d0845	1371	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
dcoban	0:1a61c61d0845	1372	tcp_listen_pcbs.listen_pcbs != NULL);
dcoban	0:1a61c61d0845	1373	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
dcoban	0:1a61c61d0845	1374	if ((lpcb->local_port == pcb->local_port) &&
dcoban	0:1a61c61d0845	1375	(ip_addr_isany(&lpcb->local_ip) \|\|
dcoban	0:1a61c61d0845	1376	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
dcoban	0:1a61c61d0845	1377	/* port and address of the listen pcb match the timed-out pcb */
dcoban	0:1a61c61d0845	1378	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
dcoban	0:1a61c61d0845	1379	lpcb->accepts_pending > 0);
dcoban	0:1a61c61d0845	1380	lpcb->accepts_pending--;
dcoban	0:1a61c61d0845	1381	break;
dcoban	0:1a61c61d0845	1382	}
dcoban	0:1a61c61d0845	1383	}
dcoban	0:1a61c61d0845	1384	}
dcoban	0:1a61c61d0845	1385	#endif /* TCP_LISTEN_BACKLOG */
dcoban	0:1a61c61d0845	1386
dcoban	0:1a61c61d0845	1387
dcoban	0:1a61c61d0845	1388	if (pcb->refused_data != NULL) {
dcoban	0:1a61c61d0845	1389	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
dcoban	0:1a61c61d0845	1390	pbuf_free(pcb->refused_data);
dcoban	0:1a61c61d0845	1391	pcb->refused_data = NULL;
dcoban	0:1a61c61d0845	1392	}
dcoban	0:1a61c61d0845	1393	if (pcb->unsent != NULL) {
dcoban	0:1a61c61d0845	1394	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
dcoban	0:1a61c61d0845	1395	}
dcoban	0:1a61c61d0845	1396	if (pcb->unacked != NULL) {
dcoban	0:1a61c61d0845	1397	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
dcoban	0:1a61c61d0845	1398	}
dcoban	0:1a61c61d0845	1399	#if TCP_QUEUE_OOSEQ
dcoban	0:1a61c61d0845	1400	if (pcb->ooseq != NULL) {
dcoban	0:1a61c61d0845	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
dcoban	0:1a61c61d0845	1402	}
dcoban	0:1a61c61d0845	1403	tcp_segs_free(pcb->ooseq);
dcoban	0:1a61c61d0845	1404	pcb->ooseq = NULL;
dcoban	0:1a61c61d0845	1405	#endif /* TCP_QUEUE_OOSEQ */
dcoban	0:1a61c61d0845	1406
dcoban	0:1a61c61d0845	1407	/* Stop the retransmission timer as it will expect data on unacked
dcoban	0:1a61c61d0845	1408	queue if it fires */
dcoban	0:1a61c61d0845	1409	pcb->rtime = -1;
dcoban	0:1a61c61d0845	1410
dcoban	0:1a61c61d0845	1411	tcp_segs_free(pcb->unsent);
dcoban	0:1a61c61d0845	1412	tcp_segs_free(pcb->unacked);
dcoban	0:1a61c61d0845	1413	pcb->unacked = pcb->unsent = NULL;
dcoban	0:1a61c61d0845	1414	#if TCP_OVERSIZE
dcoban	0:1a61c61d0845	1415	pcb->unsent_oversize = 0;
dcoban	0:1a61c61d0845	1416	#endif /* TCP_OVERSIZE */
dcoban	0:1a61c61d0845	1417	}
dcoban	0:1a61c61d0845	1418	}
dcoban	0:1a61c61d0845	1419
dcoban	0:1a61c61d0845	1420	/**
dcoban	0:1a61c61d0845	1421	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
dcoban	0:1a61c61d0845	1422	*
dcoban	0:1a61c61d0845	1423	* @param pcblist PCB list to purge.
dcoban	0:1a61c61d0845	1424	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
dcoban	0:1a61c61d0845	1425	*/
dcoban	0:1a61c61d0845	1426	void
dcoban	0:1a61c61d0845	1427	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
dcoban	0:1a61c61d0845	1428	{
dcoban	0:1a61c61d0845	1429	TCP_RMV(pcblist, pcb);
dcoban	0:1a61c61d0845	1430
dcoban	0:1a61c61d0845	1431	tcp_pcb_purge(pcb);
dcoban	0:1a61c61d0845	1432
dcoban	0:1a61c61d0845	1433	/* if there is an outstanding delayed ACKs, send it */
dcoban	0:1a61c61d0845	1434	if (pcb->state != TIME_WAIT &&
dcoban	0:1a61c61d0845	1435	pcb->state != LISTEN &&
dcoban	0:1a61c61d0845	1436	pcb->flags & TF_ACK_DELAY) {
dcoban	0:1a61c61d0845	1437	pcb->flags \|= TF_ACK_NOW;
dcoban	0:1a61c61d0845	1438	tcp_output(pcb);
dcoban	0:1a61c61d0845	1439	}
dcoban	0:1a61c61d0845	1440
dcoban	0:1a61c61d0845	1441	if (pcb->state != LISTEN) {
dcoban	0:1a61c61d0845	1442	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
dcoban	0:1a61c61d0845	1443	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
dcoban	0:1a61c61d0845	1444	#if TCP_QUEUE_OOSEQ
dcoban	0:1a61c61d0845	1445	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
dcoban	0:1a61c61d0845	1446	#endif /* TCP_QUEUE_OOSEQ */
dcoban	0:1a61c61d0845	1447	}
dcoban	0:1a61c61d0845	1448
dcoban	0:1a61c61d0845	1449	pcb->state = CLOSED;
dcoban	0:1a61c61d0845	1450
dcoban	0:1a61c61d0845	1451	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
dcoban	0:1a61c61d0845	1452	}
dcoban	0:1a61c61d0845	1453
dcoban	0:1a61c61d0845	1454	/**
dcoban	0:1a61c61d0845	1455	* Calculates a new initial sequence number for new connections.
dcoban	0:1a61c61d0845	1456	*
dcoban	0:1a61c61d0845	1457	* @return u32_t pseudo random sequence number
dcoban	0:1a61c61d0845	1458	*/
dcoban	0:1a61c61d0845	1459	u32_t
dcoban	0:1a61c61d0845	1460	tcp_next_iss(void)
dcoban	0:1a61c61d0845	1461	{
dcoban	0:1a61c61d0845	1462	static u32_t iss = 6510;
dcoban	0:1a61c61d0845	1463
dcoban	0:1a61c61d0845	1464	iss += tcp_ticks; /* XXX */
dcoban	0:1a61c61d0845	1465	return iss;
dcoban	0:1a61c61d0845	1466	}
dcoban	0:1a61c61d0845	1467
dcoban	0:1a61c61d0845	1468	#if TCP_CALCULATE_EFF_SEND_MSS
dcoban	0:1a61c61d0845	1469	/**
dcoban	0:1a61c61d0845	1470	* Calcluates the effective send mss that can be used for a specific IP address
dcoban	0:1a61c61d0845	1471	* by using ip_route to determin the netif used to send to the address and
dcoban	0:1a61c61d0845	1472	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
dcoban	0:1a61c61d0845	1473	*/
dcoban	0:1a61c61d0845	1474	u16_t
dcoban	0:1a61c61d0845	1475	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
dcoban	0:1a61c61d0845	1476	{
dcoban	0:1a61c61d0845	1477	u16_t mss_s;
dcoban	0:1a61c61d0845	1478	struct netif *outif;
dcoban	0:1a61c61d0845	1479
dcoban	0:1a61c61d0845	1480	outif = ip_route(addr);
dcoban	0:1a61c61d0845	1481	if ((outif != NULL) && (outif->mtu != 0)) {
dcoban	0:1a61c61d0845	1482	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
dcoban	0:1a61c61d0845	1483	/* RFC 1122, chap 4.2.2.6:
dcoban	0:1a61c61d0845	1484	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
dcoban	0:1a61c61d0845	1485	* We correct for TCP options in tcp_write(), and don't support IP options.
dcoban	0:1a61c61d0845	1486	*/
dcoban	0:1a61c61d0845	1487	sendmss = LWIP_MIN(sendmss, mss_s);
dcoban	0:1a61c61d0845	1488	}
dcoban	0:1a61c61d0845	1489	return sendmss;
dcoban	0:1a61c61d0845	1490	}
dcoban	0:1a61c61d0845	1491	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
dcoban	0:1a61c61d0845	1492
dcoban	0:1a61c61d0845	1493	const char*
dcoban	0:1a61c61d0845	1494	tcp_debug_state_str(enum tcp_state s)
dcoban	0:1a61c61d0845	1495	{
dcoban	0:1a61c61d0845	1496	return tcp_state_str[s];
dcoban	0:1a61c61d0845	1497	}
dcoban	0:1a61c61d0845	1498
dcoban	0:1a61c61d0845	1499	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
dcoban	0:1a61c61d0845	1500	/**
dcoban	0:1a61c61d0845	1501	* Print a tcp header for debugging purposes.
dcoban	0:1a61c61d0845	1502	*
dcoban	0:1a61c61d0845	1503	* @param tcphdr pointer to a struct tcp_hdr
dcoban	0:1a61c61d0845	1504	*/
dcoban	0:1a61c61d0845	1505	void
dcoban	0:1a61c61d0845	1506	tcp_debug_print(struct tcp_hdr *tcphdr)
dcoban	0:1a61c61d0845	1507	{
dcoban	0:1a61c61d0845	1508	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
dcoban	0:1a61c61d0845	1509	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
dcoban	0:1a61c61d0845	1510	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
dcoban	0:1a61c61d0845	1511	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
dcoban	0:1a61c61d0845	1512	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
dcoban	0:1a61c61d0845	1513	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
dcoban	0:1a61c61d0845	1514	ntohl(tcphdr->seqno)));
dcoban	0:1a61c61d0845	1515	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
dcoban	0:1a61c61d0845	1516	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
dcoban	0:1a61c61d0845	1517	ntohl(tcphdr->ackno)));
dcoban	0:1a61c61d0845	1518	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
dcoban	0:1a61c61d0845	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 (",
dcoban	0:1a61c61d0845	1520	TCPH_HDRLEN(tcphdr),
dcoban	0:1a61c61d0845	1521	TCPH_FLAGS(tcphdr) >> 5 & 1,
dcoban	0:1a61c61d0845	1522	TCPH_FLAGS(tcphdr) >> 4 & 1,
dcoban	0:1a61c61d0845	1523	TCPH_FLAGS(tcphdr) >> 3 & 1,
dcoban	0:1a61c61d0845	1524	TCPH_FLAGS(tcphdr) >> 2 & 1,
dcoban	0:1a61c61d0845	1525	TCPH_FLAGS(tcphdr) >> 1 & 1,
dcoban	0:1a61c61d0845	1526	TCPH_FLAGS(tcphdr) & 1,
dcoban	0:1a61c61d0845	1527	ntohs(tcphdr->wnd)));
dcoban	0:1a61c61d0845	1528	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
dcoban	0:1a61c61d0845	1529	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
dcoban	0:1a61c61d0845	1530	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
dcoban	0:1a61c61d0845	1531	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
dcoban	0:1a61c61d0845	1532	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
dcoban	0:1a61c61d0845	1533	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
dcoban	0:1a61c61d0845	1534	}
dcoban	0:1a61c61d0845	1535
dcoban	0:1a61c61d0845	1536	/**
dcoban	0:1a61c61d0845	1537	* Print a tcp state for debugging purposes.
dcoban	0:1a61c61d0845	1538	*
dcoban	0:1a61c61d0845	1539	* @param s enum tcp_state to print
dcoban	0:1a61c61d0845	1540	*/
dcoban	0:1a61c61d0845	1541	void
dcoban	0:1a61c61d0845	1542	tcp_debug_print_state(enum tcp_state s)
dcoban	0:1a61c61d0845	1543	{
dcoban	0:1a61c61d0845	1544	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
dcoban	0:1a61c61d0845	1545	}
dcoban	0:1a61c61d0845	1546
dcoban	0:1a61c61d0845	1547	/**
dcoban	0:1a61c61d0845	1548	* Print tcp flags for debugging purposes.
dcoban	0:1a61c61d0845	1549	*
dcoban	0:1a61c61d0845	1550	* @param flags tcp flags, all active flags are printed
dcoban	0:1a61c61d0845	1551	*/
dcoban	0:1a61c61d0845	1552	void
dcoban	0:1a61c61d0845	1553	tcp_debug_print_flags(u8_t flags)
dcoban	0:1a61c61d0845	1554	{
dcoban	0:1a61c61d0845	1555	if (flags & TCP_FIN) {
dcoban	0:1a61c61d0845	1556	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
dcoban	0:1a61c61d0845	1557	}
dcoban	0:1a61c61d0845	1558	if (flags & TCP_SYN) {
dcoban	0:1a61c61d0845	1559	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
dcoban	0:1a61c61d0845	1560	}
dcoban	0:1a61c61d0845	1561	if (flags & TCP_RST) {
dcoban	0:1a61c61d0845	1562	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
dcoban	0:1a61c61d0845	1563	}
dcoban	0:1a61c61d0845	1564	if (flags & TCP_PSH) {
dcoban	0:1a61c61d0845	1565	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
dcoban	0:1a61c61d0845	1566	}
dcoban	0:1a61c61d0845	1567	if (flags & TCP_ACK) {
dcoban	0:1a61c61d0845	1568	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
dcoban	0:1a61c61d0845	1569	}
dcoban	0:1a61c61d0845	1570	if (flags & TCP_URG) {
dcoban	0:1a61c61d0845	1571	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
dcoban	0:1a61c61d0845	1572	}
dcoban	0:1a61c61d0845	1573	if (flags & TCP_ECE) {
dcoban	0:1a61c61d0845	1574	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
dcoban	0:1a61c61d0845	1575	}
dcoban	0:1a61c61d0845	1576	if (flags & TCP_CWR) {
dcoban	0:1a61c61d0845	1577	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
dcoban	0:1a61c61d0845	1578	}
dcoban	0:1a61c61d0845	1579	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
dcoban	0:1a61c61d0845	1580	}
dcoban	0:1a61c61d0845	1581
dcoban	0:1a61c61d0845	1582	/**
dcoban	0:1a61c61d0845	1583	* Print all tcp_pcbs in every list for debugging purposes.
dcoban	0:1a61c61d0845	1584	*/
dcoban	0:1a61c61d0845	1585	void
dcoban	0:1a61c61d0845	1586	tcp_debug_print_pcbs(void)
dcoban	0:1a61c61d0845	1587	{
dcoban	0:1a61c61d0845	1588	struct tcp_pcb *pcb;
dcoban	0:1a61c61d0845	1589	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
dcoban	0:1a61c61d0845	1590	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
dcoban	0:1a61c61d0845	1591	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
dcoban	0:1a61c61d0845	1592	pcb->local_port, pcb->remote_port,
dcoban	0:1a61c61d0845	1593	pcb->snd_nxt, pcb->rcv_nxt));
dcoban	0:1a61c61d0845	1594	tcp_debug_print_state(pcb->state);
dcoban	0:1a61c61d0845	1595	}
dcoban	0:1a61c61d0845	1596	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
dcoban	0:1a61c61d0845	1597	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
dcoban	0:1a61c61d0845	1598	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
dcoban	0:1a61c61d0845	1599	pcb->local_port, pcb->remote_port,
dcoban	0:1a61c61d0845	1600	pcb->snd_nxt, pcb->rcv_nxt));
dcoban	0:1a61c61d0845	1601	tcp_debug_print_state(pcb->state);
dcoban	0:1a61c61d0845	1602	}
dcoban	0:1a61c61d0845	1603	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
dcoban	0:1a61c61d0845	1604	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
dcoban	0:1a61c61d0845	1605	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
dcoban	0:1a61c61d0845	1606	pcb->local_port, pcb->remote_port,
dcoban	0:1a61c61d0845	1607	pcb->snd_nxt, pcb->rcv_nxt));
dcoban	0:1a61c61d0845	1608	tcp_debug_print_state(pcb->state);
dcoban	0:1a61c61d0845	1609	}
dcoban	0:1a61c61d0845	1610	}
dcoban	0:1a61c61d0845	1611
dcoban	0:1a61c61d0845	1612	/**
dcoban	0:1a61c61d0845	1613	* Check state consistency of the tcp_pcb lists.
dcoban	0:1a61c61d0845	1614	*/
dcoban	0:1a61c61d0845	1615	s16_t
dcoban	0:1a61c61d0845	1616	tcp_pcbs_sane(void)
dcoban	0:1a61c61d0845	1617	{
dcoban	0:1a61c61d0845	1618	struct tcp_pcb *pcb;
dcoban	0:1a61c61d0845	1619	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
dcoban	0:1a61c61d0845	1620	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
dcoban	0:1a61c61d0845	1621	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
dcoban	0:1a61c61d0845	1622	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
dcoban	0:1a61c61d0845	1623	}
dcoban	0:1a61c61d0845	1624	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
dcoban	0:1a61c61d0845	1625	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
dcoban	0:1a61c61d0845	1626	}
dcoban	0:1a61c61d0845	1627	return 1;
dcoban	0:1a61c61d0845	1628	}
dcoban	0:1a61c61d0845	1629	#endif /* TCP_DEBUG */
dcoban	0:1a61c61d0845	1630
dcoban	0:1a61c61d0845	1631	#endif /* LWIP_TCP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	03 Apr 2012
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	4
Followers:	1

NetStack/lwip/core/tcp.c@0:1a61c61d0845, 2012-04-03 (annotated)

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