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NetTribute library with debug turned on in FShandler Donatien Garner -> Segundo Equipo -> this version

lwip/core/tcp.c@0:281d6ff68967, 2010-11-19 (annotated)

Committer:: hexley
Date:: Fri Nov 19 01:54:45 2010 +0000
Revision:: 0:281d6ff68967

Who changed what in which revision?

User	Revision	Line number	New contents of line
hexley	0:281d6ff68967	1	/**
hexley	0:281d6ff68967	2	* @file
hexley	0:281d6ff68967	3	* Transmission Control Protocol for IP
hexley	0:281d6ff68967	4	*
hexley	0:281d6ff68967	5	* This file contains common functions for the TCP implementation, such as functinos
hexley	0:281d6ff68967	6	* for manipulating the data structures and the TCP timer functions. TCP functions
hexley	0:281d6ff68967	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
hexley	0:281d6ff68967	8	*
hexley	0:281d6ff68967	9	*/
hexley	0:281d6ff68967	10
hexley	0:281d6ff68967	11	/*
hexley	0:281d6ff68967	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
hexley	0:281d6ff68967	13	* All rights reserved.
hexley	0:281d6ff68967	14	*
hexley	0:281d6ff68967	15	* Redistribution and use in source and binary forms, with or without modification,
hexley	0:281d6ff68967	16	* are permitted provided that the following conditions are met:
hexley	0:281d6ff68967	17	*
hexley	0:281d6ff68967	18	* 1. Redistributions of source code must retain the above copyright notice,
hexley	0:281d6ff68967	19	* this list of conditions and the following disclaimer.
hexley	0:281d6ff68967	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
hexley	0:281d6ff68967	21	* this list of conditions and the following disclaimer in the documentation
hexley	0:281d6ff68967	22	* and/or other materials provided with the distribution.
hexley	0:281d6ff68967	23	* 3. The name of the author may not be used to endorse or promote products
hexley	0:281d6ff68967	24	* derived from this software without specific prior written permission.
hexley	0:281d6ff68967	25	*
hexley	0:281d6ff68967	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
hexley	0:281d6ff68967	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
hexley	0:281d6ff68967	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
hexley	0:281d6ff68967	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
hexley	0:281d6ff68967	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
hexley	0:281d6ff68967	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
hexley	0:281d6ff68967	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
hexley	0:281d6ff68967	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
hexley	0:281d6ff68967	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
hexley	0:281d6ff68967	35	* OF SUCH DAMAGE.
hexley	0:281d6ff68967	36	*
hexley	0:281d6ff68967	37	* This file is part of the lwIP TCP/IP stack.
hexley	0:281d6ff68967	38	*
hexley	0:281d6ff68967	39	* Author: Adam Dunkels <adam@sics.se>
hexley	0:281d6ff68967	40	*
hexley	0:281d6ff68967	41	*/
hexley	0:281d6ff68967	42
hexley	0:281d6ff68967	43	#include "lwip/opt.h"
hexley	0:281d6ff68967	44
hexley	0:281d6ff68967	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
hexley	0:281d6ff68967	46
hexley	0:281d6ff68967	47	#include "lwip/def.h"
hexley	0:281d6ff68967	48	#include "lwip/mem.h"
hexley	0:281d6ff68967	49	#include "lwip/memp.h"
hexley	0:281d6ff68967	50	#include "lwip/snmp.h"
hexley	0:281d6ff68967	51	#include "lwip/tcp.h"
hexley	0:281d6ff68967	52	#include "lwip/tcp_impl.h"
hexley	0:281d6ff68967	53	#include "lwip/debug.h"
hexley	0:281d6ff68967	54	#include "lwip/stats.h"
hexley	0:281d6ff68967	55
hexley	0:281d6ff68967	56	#include <string.h>
hexley	0:281d6ff68967	57
hexley	0:281d6ff68967	58	const char * const tcp_state_str[] = {
hexley	0:281d6ff68967	59	"CLOSED",
hexley	0:281d6ff68967	60	"LISTEN",
hexley	0:281d6ff68967	61	"SYN_SENT",
hexley	0:281d6ff68967	62	"SYN_RCVD",
hexley	0:281d6ff68967	63	"ESTABLISHED",
hexley	0:281d6ff68967	64	"FIN_WAIT_1",
hexley	0:281d6ff68967	65	"FIN_WAIT_2",
hexley	0:281d6ff68967	66	"CLOSE_WAIT",
hexley	0:281d6ff68967	67	"CLOSING",
hexley	0:281d6ff68967	68	"LAST_ACK",
hexley	0:281d6ff68967	69	"TIME_WAIT"
hexley	0:281d6ff68967	70	};
hexley	0:281d6ff68967	71
hexley	0:281d6ff68967	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
hexley	0:281d6ff68967	73	u32_t tcp_ticks;
hexley	0:281d6ff68967	74	const u8_t tcp_backoff[13] =
hexley	0:281d6ff68967	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
hexley	0:281d6ff68967	76	/* Times per slowtmr hits */
hexley	0:281d6ff68967	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
hexley	0:281d6ff68967	78
hexley	0:281d6ff68967	79	/* The TCP PCB lists. */
hexley	0:281d6ff68967	80
hexley	0:281d6ff68967	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
hexley	0:281d6ff68967	82	struct tcp_pcb *tcp_bound_pcbs;
hexley	0:281d6ff68967	83	/** List of all TCP PCBs in LISTEN state */
hexley	0:281d6ff68967	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
hexley	0:281d6ff68967	85	/** List of all TCP PCBs that are in a state in which
hexley	0:281d6ff68967	86	* they accept or send data. */
hexley	0:281d6ff68967	87	struct tcp_pcb *tcp_active_pcbs;
hexley	0:281d6ff68967	88	/** List of all TCP PCBs in TIME-WAIT state */
hexley	0:281d6ff68967	89	struct tcp_pcb *tcp_tw_pcbs;
hexley	0:281d6ff68967	90
hexley	0:281d6ff68967	91	#define NUM_TCP_PCB_LISTS 4
hexley	0:281d6ff68967	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
hexley	0:281d6ff68967	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
hexley	0:281d6ff68967	94	struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
hexley	0:281d6ff68967	95	&tcp_active_pcbs, &tcp_tw_pcbs};
hexley	0:281d6ff68967	96
hexley	0:281d6ff68967	97	/** Only used for temporary storage. */
hexley	0:281d6ff68967	98	struct tcp_pcb *tcp_tmp_pcb;
hexley	0:281d6ff68967	99
hexley	0:281d6ff68967	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
hexley	0:281d6ff68967	101	static u8_t tcp_timer;
hexley	0:281d6ff68967	102	static u16_t tcp_new_port(void);
hexley	0:281d6ff68967	103
hexley	0:281d6ff68967	104	/**
hexley	0:281d6ff68967	105	* Called periodically to dispatch TCP timers.
hexley	0:281d6ff68967	106	*
hexley	0:281d6ff68967	107	*/
hexley	0:281d6ff68967	108	void
hexley	0:281d6ff68967	109	tcp_tmr(void)
hexley	0:281d6ff68967	110	{
hexley	0:281d6ff68967	111	/* Call tcp_fasttmr() every 250 ms */
hexley	0:281d6ff68967	112	tcp_fasttmr();
hexley	0:281d6ff68967	113
hexley	0:281d6ff68967	114	if (++tcp_timer & 1) {
hexley	0:281d6ff68967	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
hexley	0:281d6ff68967	116	tcp_tmr() is called. */
hexley	0:281d6ff68967	117	tcp_slowtmr();
hexley	0:281d6ff68967	118	}
hexley	0:281d6ff68967	119	}
hexley	0:281d6ff68967	120
hexley	0:281d6ff68967	121	/**
hexley	0:281d6ff68967	122	* Closes the TX side of a connection held by the PCB.
hexley	0:281d6ff68967	123	* For tcp_close(), a RST is sent if the application didn't receive all data
hexley	0:281d6ff68967	124	* (tcp_recved() not called for all data passed to recv callback).
hexley	0:281d6ff68967	125	*
hexley	0:281d6ff68967	126	* Listening pcbs are freed and may not be referenced any more.
hexley	0:281d6ff68967	127	* Connection pcbs are freed if not yet connected and may not be referenced
hexley	0:281d6ff68967	128	* any more. If a connection is established (at least SYN received or in
hexley	0:281d6ff68967	129	* a closing state), the connection is closed, and put in a closing state.
hexley	0:281d6ff68967	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
hexley	0:281d6ff68967	131	* unsafe to reference it.
hexley	0:281d6ff68967	132	*
hexley	0:281d6ff68967	133	* @param pcb the tcp_pcb to close
hexley	0:281d6ff68967	134	* @return ERR_OK if connection has been closed
hexley	0:281d6ff68967	135	* another err_t if closing failed and pcb is not freed
hexley	0:281d6ff68967	136	*/
hexley	0:281d6ff68967	137	static err_t
hexley	0:281d6ff68967	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
hexley	0:281d6ff68967	139	{
hexley	0:281d6ff68967	140	err_t err;
hexley	0:281d6ff68967	141
hexley	0:281d6ff68967	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
hexley	0:281d6ff68967	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
hexley	0:281d6ff68967	144	/* Not all data received by application, send RST to tell the remote
hexley	0:281d6ff68967	145	side about this. */
hexley	0:281d6ff68967	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
hexley	0:281d6ff68967	147
hexley	0:281d6ff68967	148	/* don't call tcp_abort here: we must not deallocate the pcb since
hexley	0:281d6ff68967	149	that might not be expected when calling tcp_close */
hexley	0:281d6ff68967	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
hexley	0:281d6ff68967	151	pcb->local_port, pcb->remote_port);
hexley	0:281d6ff68967	152
hexley	0:281d6ff68967	153	tcp_pcb_purge(pcb);
hexley	0:281d6ff68967	154
hexley	0:281d6ff68967	155	/* TODO: to which state do we move now? */
hexley	0:281d6ff68967	156
hexley	0:281d6ff68967	157	/* move to TIME_WAIT since we close actively */
hexley	0:281d6ff68967	158	TCP_RMV(&tcp_active_pcbs, pcb);
hexley	0:281d6ff68967	159	pcb->state = TIME_WAIT;
hexley	0:281d6ff68967	160	TCP_REG(&tcp_tw_pcbs, pcb);
hexley	0:281d6ff68967	161
hexley	0:281d6ff68967	162	return ERR_OK;
hexley	0:281d6ff68967	163	}
hexley	0:281d6ff68967	164	}
hexley	0:281d6ff68967	165
hexley	0:281d6ff68967	166	switch (pcb->state) {
hexley	0:281d6ff68967	167	case CLOSED:
hexley	0:281d6ff68967	168	/* Closing a pcb in the CLOSED state might seem erroneous,
hexley	0:281d6ff68967	169	* however, it is in this state once allocated and as yet unused
hexley	0:281d6ff68967	170	* and the user needs some way to free it should the need arise.
hexley	0:281d6ff68967	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
hexley	0:281d6ff68967	172	* or for a pcb that has been used and then entered the CLOSED state
hexley	0:281d6ff68967	173	* is erroneous, but this should never happen as the pcb has in those cases
hexley	0:281d6ff68967	174	* been freed, and so any remaining handles are bogus. */
hexley	0:281d6ff68967	175	err = ERR_OK;
hexley	0:281d6ff68967	176	TCP_RMV(&tcp_bound_pcbs, pcb);
hexley	0:281d6ff68967	177	memp_free(MEMP_TCP_PCB, pcb);
hexley	0:281d6ff68967	178	pcb = NULL;
hexley	0:281d6ff68967	179	break;
hexley	0:281d6ff68967	180	case LISTEN:
hexley	0:281d6ff68967	181	err = ERR_OK;
hexley	0:281d6ff68967	182	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
hexley	0:281d6ff68967	183	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
hexley	0:281d6ff68967	184	pcb = NULL;
hexley	0:281d6ff68967	185	break;
hexley	0:281d6ff68967	186	case SYN_SENT:
hexley	0:281d6ff68967	187	err = ERR_OK;
hexley	0:281d6ff68967	188	tcp_pcb_remove(&tcp_active_pcbs, pcb);
hexley	0:281d6ff68967	189	memp_free(MEMP_TCP_PCB, pcb);
hexley	0:281d6ff68967	190	pcb = NULL;
hexley	0:281d6ff68967	191	snmp_inc_tcpattemptfails();
hexley	0:281d6ff68967	192	break;
hexley	0:281d6ff68967	193	case SYN_RCVD:
hexley	0:281d6ff68967	194	err = tcp_send_fin(pcb);
hexley	0:281d6ff68967	195	if (err == ERR_OK) {
hexley	0:281d6ff68967	196	snmp_inc_tcpattemptfails();
hexley	0:281d6ff68967	197	pcb->state = FIN_WAIT_1;
hexley	0:281d6ff68967	198	}
hexley	0:281d6ff68967	199	break;
hexley	0:281d6ff68967	200	case ESTABLISHED:
hexley	0:281d6ff68967	201	err = tcp_send_fin(pcb);
hexley	0:281d6ff68967	202	if (err == ERR_OK) {
hexley	0:281d6ff68967	203	snmp_inc_tcpestabresets();
hexley	0:281d6ff68967	204	pcb->state = FIN_WAIT_1;
hexley	0:281d6ff68967	205	}
hexley	0:281d6ff68967	206	break;
hexley	0:281d6ff68967	207	case CLOSE_WAIT:
hexley	0:281d6ff68967	208	err = tcp_send_fin(pcb);
hexley	0:281d6ff68967	209	if (err == ERR_OK) {
hexley	0:281d6ff68967	210	snmp_inc_tcpestabresets();
hexley	0:281d6ff68967	211	pcb->state = LAST_ACK;
hexley	0:281d6ff68967	212	}
hexley	0:281d6ff68967	213	break;
hexley	0:281d6ff68967	214	default:
hexley	0:281d6ff68967	215	/* Has already been closed, do nothing. */
hexley	0:281d6ff68967	216	err = ERR_OK;
hexley	0:281d6ff68967	217	pcb = NULL;
hexley	0:281d6ff68967	218	break;
hexley	0:281d6ff68967	219	}
hexley	0:281d6ff68967	220
hexley	0:281d6ff68967	221	if (pcb != NULL && err == ERR_OK) {
hexley	0:281d6ff68967	222	/* To ensure all data has been sent when tcp_close returns, we have
hexley	0:281d6ff68967	223	to make sure tcp_output doesn't fail.
hexley	0:281d6ff68967	224	Since we don't really have to ensure all data has been sent when tcp_close
hexley	0:281d6ff68967	225	returns (unsent data is sent from tcp timer functions, also), we don't care
hexley	0:281d6ff68967	226	for the return value of tcp_output for now. */
hexley	0:281d6ff68967	227	/* @todo: When implementing SO_LINGER, this must be changed somehow:
hexley	0:281d6ff68967	228	If SOF_LINGER is set, the data should be sent and acked before close returns.
hexley	0:281d6ff68967	229	This can only be valid for sequential APIs, not for the raw API. */
hexley	0:281d6ff68967	230	tcp_output(pcb);
hexley	0:281d6ff68967	231	}
hexley	0:281d6ff68967	232	return err;
hexley	0:281d6ff68967	233	}
hexley	0:281d6ff68967	234
hexley	0:281d6ff68967	235	/**
hexley	0:281d6ff68967	236	* Closes the connection held by the PCB.
hexley	0:281d6ff68967	237	*
hexley	0:281d6ff68967	238	* Listening pcbs are freed and may not be referenced any more.
hexley	0:281d6ff68967	239	* Connection pcbs are freed if not yet connected and may not be referenced
hexley	0:281d6ff68967	240	* any more. If a connection is established (at least SYN received or in
hexley	0:281d6ff68967	241	* a closing state), the connection is closed, and put in a closing state.
hexley	0:281d6ff68967	242	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
hexley	0:281d6ff68967	243	* unsafe to reference it (unless an error is returned).
hexley	0:281d6ff68967	244	*
hexley	0:281d6ff68967	245	* @param pcb the tcp_pcb to close
hexley	0:281d6ff68967	246	* @return ERR_OK if connection has been closed
hexley	0:281d6ff68967	247	* another err_t if closing failed and pcb is not freed
hexley	0:281d6ff68967	248	*/
hexley	0:281d6ff68967	249	err_t
hexley	0:281d6ff68967	250	tcp_close(struct tcp_pcb *pcb)
hexley	0:281d6ff68967	251	{
hexley	0:281d6ff68967	252	#if TCP_DEBUG
hexley	0:281d6ff68967	253	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
hexley	0:281d6ff68967	254	tcp_debug_print_state(pcb->state);
hexley	0:281d6ff68967	255	#endif /* TCP_DEBUG */
hexley	0:281d6ff68967	256
hexley	0:281d6ff68967	257	if (pcb->state != LISTEN) {
hexley	0:281d6ff68967	258	/* Set a flag not to receive any more data... */
hexley	0:281d6ff68967	259	pcb->flags \|= TF_RXCLOSED;
hexley	0:281d6ff68967	260	}
hexley	0:281d6ff68967	261	/* ... and close */
hexley	0:281d6ff68967	262	return tcp_close_shutdown(pcb, 1);
hexley	0:281d6ff68967	263	}
hexley	0:281d6ff68967	264
hexley	0:281d6ff68967	265	/**
hexley	0:281d6ff68967	266	* Causes all or part of a full-duplex connection of this PCB to be shut down.
hexley	0:281d6ff68967	267	* This doesn't deallocate the PCB!
hexley	0:281d6ff68967	268	*
hexley	0:281d6ff68967	269	* @param pcb PCB to shutdown
hexley	0:281d6ff68967	270	* @param shut_rx shut down receive side if this is != 0
hexley	0:281d6ff68967	271	* @param shut_tx shut down send side if this is != 0
hexley	0:281d6ff68967	272	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
hexley	0:281d6ff68967	273	* another err_t on error.
hexley	0:281d6ff68967	274	*/
hexley	0:281d6ff68967	275	err_t
hexley	0:281d6ff68967	276	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
hexley	0:281d6ff68967	277	{
hexley	0:281d6ff68967	278	if (pcb->state == LISTEN) {
hexley	0:281d6ff68967	279	return ERR_CONN;
hexley	0:281d6ff68967	280	}
hexley	0:281d6ff68967	281	if (shut_rx) {
hexley	0:281d6ff68967	282	/* shut down the receive side: free buffered data... */
hexley	0:281d6ff68967	283	if (pcb->refused_data != NULL) {
hexley	0:281d6ff68967	284	pbuf_free(pcb->refused_data);
hexley	0:281d6ff68967	285	pcb->refused_data = NULL;
hexley	0:281d6ff68967	286	}
hexley	0:281d6ff68967	287	/* ... and set a flag not to receive any more data */
hexley	0:281d6ff68967	288	pcb->flags \|= TF_RXCLOSED;
hexley	0:281d6ff68967	289	}
hexley	0:281d6ff68967	290	if (shut_tx) {
hexley	0:281d6ff68967	291	/* This can't happen twice since if it succeeds, the pcb's state is changed.
hexley	0:281d6ff68967	292	Only close in these states as the others directly deallocate the PCB */
hexley	0:281d6ff68967	293	switch (pcb->state) {
hexley	0:281d6ff68967	294	case SYN_RCVD:
hexley	0:281d6ff68967	295	case ESTABLISHED:
hexley	0:281d6ff68967	296	case CLOSE_WAIT:
hexley	0:281d6ff68967	297	return tcp_close_shutdown(pcb, 0);
hexley	0:281d6ff68967	298	default:
hexley	0:281d6ff68967	299	/* don't shut down other states */
hexley	0:281d6ff68967	300	break;
hexley	0:281d6ff68967	301	}
hexley	0:281d6ff68967	302	}
hexley	0:281d6ff68967	303	/* @todo: return another err_t if not in correct state or already shut? */
hexley	0:281d6ff68967	304	return ERR_OK;
hexley	0:281d6ff68967	305	}
hexley	0:281d6ff68967	306
hexley	0:281d6ff68967	307	/**
hexley	0:281d6ff68967	308	* Abandons a connection and optionally sends a RST to the remote
hexley	0:281d6ff68967	309	* host. Deletes the local protocol control block. This is done when
hexley	0:281d6ff68967	310	* a connection is killed because of shortage of memory.
hexley	0:281d6ff68967	311	*
hexley	0:281d6ff68967	312	* @param pcb the tcp_pcb to abort
hexley	0:281d6ff68967	313	* @param reset boolean to indicate whether a reset should be sent
hexley	0:281d6ff68967	314	*/
hexley	0:281d6ff68967	315	void
hexley	0:281d6ff68967	316	tcp_abandon(struct tcp_pcb *pcb, int reset)
hexley	0:281d6ff68967	317	{
hexley	0:281d6ff68967	318	u32_t seqno, ackno;
hexley	0:281d6ff68967	319	u16_t remote_port, local_port;
hexley	0:281d6ff68967	320	ip_addr_t remote_ip, local_ip;
hexley	0:281d6ff68967	321	#if LWIP_CALLBACK_API
hexley	0:281d6ff68967	322	tcp_err_fn errf;
hexley	0:281d6ff68967	323	#endif /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	324	void *errf_arg;
hexley	0:281d6ff68967	325
hexley	0:281d6ff68967	326	/* pcb->state LISTEN not allowed here */
hexley	0:281d6ff68967	327	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
hexley	0:281d6ff68967	328	pcb->state != LISTEN);
hexley	0:281d6ff68967	329	/* Figure out on which TCP PCB list we are, and remove us. If we
hexley	0:281d6ff68967	330	are in an active state, call the receive function associated with
hexley	0:281d6ff68967	331	the PCB with a NULL argument, and send an RST to the remote end. */
hexley	0:281d6ff68967	332	if (pcb->state == TIME_WAIT) {
hexley	0:281d6ff68967	333	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
hexley	0:281d6ff68967	334	memp_free(MEMP_TCP_PCB, pcb);
hexley	0:281d6ff68967	335	} else {
hexley	0:281d6ff68967	336	seqno = pcb->snd_nxt;
hexley	0:281d6ff68967	337	ackno = pcb->rcv_nxt;
hexley	0:281d6ff68967	338	ip_addr_copy(local_ip, pcb->local_ip);
hexley	0:281d6ff68967	339	ip_addr_copy(remote_ip, pcb->remote_ip);
hexley	0:281d6ff68967	340	local_port = pcb->local_port;
hexley	0:281d6ff68967	341	remote_port = pcb->remote_port;
hexley	0:281d6ff68967	342	#if LWIP_CALLBACK_API
hexley	0:281d6ff68967	343	errf = pcb->errf;
hexley	0:281d6ff68967	344	#endif /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	345	errf_arg = pcb->callback_arg;
hexley	0:281d6ff68967	346	tcp_pcb_remove(&tcp_active_pcbs, pcb);
hexley	0:281d6ff68967	347	if (pcb->unacked != NULL) {
hexley	0:281d6ff68967	348	tcp_segs_free(pcb->unacked);
hexley	0:281d6ff68967	349	}
hexley	0:281d6ff68967	350	if (pcb->unsent != NULL) {
hexley	0:281d6ff68967	351	tcp_segs_free(pcb->unsent);
hexley	0:281d6ff68967	352	}
hexley	0:281d6ff68967	353	#if TCP_QUEUE_OOSEQ
hexley	0:281d6ff68967	354	if (pcb->ooseq != NULL) {
hexley	0:281d6ff68967	355	tcp_segs_free(pcb->ooseq);
hexley	0:281d6ff68967	356	}
hexley	0:281d6ff68967	357	#endif /* TCP_QUEUE_OOSEQ */
hexley	0:281d6ff68967	358	memp_free(MEMP_TCP_PCB, pcb);
hexley	0:281d6ff68967	359	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
hexley	0:281d6ff68967	360	if (reset) {
hexley	0:281d6ff68967	361	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
hexley	0:281d6ff68967	362	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
hexley	0:281d6ff68967	363	}
hexley	0:281d6ff68967	364	}
hexley	0:281d6ff68967	365	}
hexley	0:281d6ff68967	366
hexley	0:281d6ff68967	367	/**
hexley	0:281d6ff68967	368	* Aborts the connection by sending a RST (reset) segment to the remote
hexley	0:281d6ff68967	369	* host. The pcb is deallocated. This function never fails.
hexley	0:281d6ff68967	370	*
hexley	0:281d6ff68967	371	* ATTENTION: When calling this from one of the TCP callbacks, make
hexley	0:281d6ff68967	372	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
hexley	0:281d6ff68967	373	* or you will risk accessing deallocated memory or memory leaks!
hexley	0:281d6ff68967	374	*
hexley	0:281d6ff68967	375	* @param pcb the tcp pcb to abort
hexley	0:281d6ff68967	376	*/
hexley	0:281d6ff68967	377	void
hexley	0:281d6ff68967	378	tcp_abort(struct tcp_pcb *pcb)
hexley	0:281d6ff68967	379	{
hexley	0:281d6ff68967	380	tcp_abandon(pcb, 1);
hexley	0:281d6ff68967	381	}
hexley	0:281d6ff68967	382
hexley	0:281d6ff68967	383	/**
hexley	0:281d6ff68967	384	* Binds the connection to a local portnumber and IP address. If the
hexley	0:281d6ff68967	385	* IP address is not given (i.e., ipaddr == NULL), the IP address of
hexley	0:281d6ff68967	386	* the outgoing network interface is used instead.
hexley	0:281d6ff68967	387	*
hexley	0:281d6ff68967	388	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
hexley	0:281d6ff68967	389	* already bound!)
hexley	0:281d6ff68967	390	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
hexley	0:281d6ff68967	391	* to any local address
hexley	0:281d6ff68967	392	* @param port the local port to bind to
hexley	0:281d6ff68967	393	* @return ERR_USE if the port is already in use
hexley	0:281d6ff68967	394	* ERR_OK if bound
hexley	0:281d6ff68967	395	*/
hexley	0:281d6ff68967	396	err_t
hexley	0:281d6ff68967	397	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
hexley	0:281d6ff68967	398	{
hexley	0:281d6ff68967	399	int i;
hexley	0:281d6ff68967	400	int max_pcb_list = NUM_TCP_PCB_LISTS;
hexley	0:281d6ff68967	401	struct tcp_pcb *cpcb;
hexley	0:281d6ff68967	402
hexley	0:281d6ff68967	403	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
hexley	0:281d6ff68967	404
hexley	0:281d6ff68967	405	#if SO_REUSE
hexley	0:281d6ff68967	406	/* Unless the REUSEADDR flag is set,
hexley	0:281d6ff68967	407	we have to check the pcbs in TIME-WAIT state, also.
hexley	0:281d6ff68967	408	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
hexley	0:281d6ff68967	409	packets using both local and remote IP addresses and ports to distinguish.
hexley	0:281d6ff68967	410	*/
hexley	0:281d6ff68967	411	#if SO_REUSE
hexley	0:281d6ff68967	412	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
hexley	0:281d6ff68967	413	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
hexley	0:281d6ff68967	414	}
hexley	0:281d6ff68967	415	#endif /* SO_REUSE */
hexley	0:281d6ff68967	416	#endif /* SO_REUSE */
hexley	0:281d6ff68967	417
hexley	0:281d6ff68967	418	if (port == 0) {
hexley	0:281d6ff68967	419	port = tcp_new_port();
hexley	0:281d6ff68967	420	}
hexley	0:281d6ff68967	421
hexley	0:281d6ff68967	422	/* Check if the address already is in use (on all lists) */
hexley	0:281d6ff68967	423	for (i = 0; i < max_pcb_list; i++) {
hexley	0:281d6ff68967	424	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
hexley	0:281d6ff68967	425	if (cpcb->local_port == port) {
hexley	0:281d6ff68967	426	#if SO_REUSE
hexley	0:281d6ff68967	427	/* Omit checking for the same port if both pcbs have REUSEADDR set.
hexley	0:281d6ff68967	428	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
hexley	0:281d6ff68967	429	tcp_connect. */
hexley	0:281d6ff68967	430	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
hexley	0:281d6ff68967	431	((cpcb->so_options & SOF_REUSEADDR) == 0))
hexley	0:281d6ff68967	432	#endif /* SO_REUSE */
hexley	0:281d6ff68967	433	{
hexley	0:281d6ff68967	434	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
hexley	0:281d6ff68967	435	ip_addr_isany(ipaddr) \|\|
hexley	0:281d6ff68967	436	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
hexley	0:281d6ff68967	437	return ERR_USE;
hexley	0:281d6ff68967	438	}
hexley	0:281d6ff68967	439	}
hexley	0:281d6ff68967	440	}
hexley	0:281d6ff68967	441	}
hexley	0:281d6ff68967	442	}
hexley	0:281d6ff68967	443
hexley	0:281d6ff68967	444	if (!ip_addr_isany(ipaddr)) {
hexley	0:281d6ff68967	445	pcb->local_ip = *ipaddr;
hexley	0:281d6ff68967	446	}
hexley	0:281d6ff68967	447	pcb->local_port = port;
hexley	0:281d6ff68967	448	TCP_REG(&tcp_bound_pcbs, pcb);
hexley	0:281d6ff68967	449	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
hexley	0:281d6ff68967	450	return ERR_OK;
hexley	0:281d6ff68967	451	}
hexley	0:281d6ff68967	452	#if LWIP_CALLBACK_API
hexley	0:281d6ff68967	453	/**
hexley	0:281d6ff68967	454	* Default accept callback if no accept callback is specified by the user.
hexley	0:281d6ff68967	455	*/
hexley	0:281d6ff68967	456	static err_t
hexley	0:281d6ff68967	457	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
hexley	0:281d6ff68967	458	{
hexley	0:281d6ff68967	459	LWIP_UNUSED_ARG(arg);
hexley	0:281d6ff68967	460	LWIP_UNUSED_ARG(pcb);
hexley	0:281d6ff68967	461	LWIP_UNUSED_ARG(err);
hexley	0:281d6ff68967	462
hexley	0:281d6ff68967	463	return ERR_ABRT;
hexley	0:281d6ff68967	464	}
hexley	0:281d6ff68967	465	#endif /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	466
hexley	0:281d6ff68967	467	/**
hexley	0:281d6ff68967	468	* Set the state of the connection to be LISTEN, which means that it
hexley	0:281d6ff68967	469	* is able to accept incoming connections. The protocol control block
hexley	0:281d6ff68967	470	* is reallocated in order to consume less memory. Setting the
hexley	0:281d6ff68967	471	* connection to LISTEN is an irreversible process.
hexley	0:281d6ff68967	472	*
hexley	0:281d6ff68967	473	* @param pcb the original tcp_pcb
hexley	0:281d6ff68967	474	* @param backlog the incoming connections queue limit
hexley	0:281d6ff68967	475	* @return tcp_pcb used for listening, consumes less memory.
hexley	0:281d6ff68967	476	*
hexley	0:281d6ff68967	477	* @note The original tcp_pcb is freed. This function therefore has to be
hexley	0:281d6ff68967	478	* called like this:
hexley	0:281d6ff68967	479	* tpcb = tcp_listen(tpcb);
hexley	0:281d6ff68967	480	*/
hexley	0:281d6ff68967	481	struct tcp_pcb *
hexley	0:281d6ff68967	482	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
hexley	0:281d6ff68967	483	{
hexley	0:281d6ff68967	484	struct tcp_pcb_listen *lpcb;
hexley	0:281d6ff68967	485
hexley	0:281d6ff68967	486	LWIP_UNUSED_ARG(backlog);
hexley	0:281d6ff68967	487	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
hexley	0:281d6ff68967	488
hexley	0:281d6ff68967	489	/* already listening? */
hexley	0:281d6ff68967	490	if (pcb->state == LISTEN) {
hexley	0:281d6ff68967	491	return pcb;
hexley	0:281d6ff68967	492	}
hexley	0:281d6ff68967	493	#if SO_REUSE
hexley	0:281d6ff68967	494	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
hexley	0:281d6ff68967	495	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
hexley	0:281d6ff68967	496	is declared (listen-/connection-pcb), we have to make sure now that
hexley	0:281d6ff68967	497	this port is only used once for every local IP. */
hexley	0:281d6ff68967	498	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
hexley	0:281d6ff68967	499	if (lpcb->local_port == pcb->local_port) {
hexley	0:281d6ff68967	500	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
hexley	0:281d6ff68967	501	/* this address/port is already used */
hexley	0:281d6ff68967	502	return NULL;
hexley	0:281d6ff68967	503	}
hexley	0:281d6ff68967	504	}
hexley	0:281d6ff68967	505	}
hexley	0:281d6ff68967	506	}
hexley	0:281d6ff68967	507	#endif /* SO_REUSE */
hexley	0:281d6ff68967	508	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
hexley	0:281d6ff68967	509	if (lpcb == NULL) {
hexley	0:281d6ff68967	510	return NULL;
hexley	0:281d6ff68967	511	}
hexley	0:281d6ff68967	512	lpcb->callback_arg = pcb->callback_arg;
hexley	0:281d6ff68967	513	lpcb->local_port = pcb->local_port;
hexley	0:281d6ff68967	514	lpcb->state = LISTEN;
hexley	0:281d6ff68967	515	lpcb->prio = pcb->prio;
hexley	0:281d6ff68967	516	lpcb->so_options = pcb->so_options;
hexley	0:281d6ff68967	517	lpcb->so_options \|= SOF_ACCEPTCONN;
hexley	0:281d6ff68967	518	lpcb->ttl = pcb->ttl;
hexley	0:281d6ff68967	519	lpcb->tos = pcb->tos;
hexley	0:281d6ff68967	520	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
hexley	0:281d6ff68967	521	TCP_RMV(&tcp_bound_pcbs, pcb);
hexley	0:281d6ff68967	522	memp_free(MEMP_TCP_PCB, pcb);
hexley	0:281d6ff68967	523	#if LWIP_CALLBACK_API
hexley	0:281d6ff68967	524	lpcb->accept = tcp_accept_null;
hexley	0:281d6ff68967	525	#endif /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	526	#if TCP_LISTEN_BACKLOG
hexley	0:281d6ff68967	527	lpcb->accepts_pending = 0;
hexley	0:281d6ff68967	528	lpcb->backlog = (backlog ? backlog : 1);
hexley	0:281d6ff68967	529	#endif /* TCP_LISTEN_BACKLOG */
hexley	0:281d6ff68967	530	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
hexley	0:281d6ff68967	531	return (struct tcp_pcb *)lpcb;
hexley	0:281d6ff68967	532	}
hexley	0:281d6ff68967	533
hexley	0:281d6ff68967	534	/**
hexley	0:281d6ff68967	535	* Update the state that tracks the available window space to advertise.
hexley	0:281d6ff68967	536	*
hexley	0:281d6ff68967	537	* Returns how much extra window would be advertised if we sent an
hexley	0:281d6ff68967	538	* update now.
hexley	0:281d6ff68967	539	*/
hexley	0:281d6ff68967	540	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
hexley	0:281d6ff68967	541	{
hexley	0:281d6ff68967	542	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
hexley	0:281d6ff68967	543
hexley	0:281d6ff68967	544	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
hexley	0:281d6ff68967	545	/* we can advertise more window */
hexley	0:281d6ff68967	546	pcb->rcv_ann_wnd = pcb->rcv_wnd;
hexley	0:281d6ff68967	547	return new_right_edge - pcb->rcv_ann_right_edge;
hexley	0:281d6ff68967	548	} else {
hexley	0:281d6ff68967	549	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
hexley	0:281d6ff68967	550	/* Can happen due to other end sending out of advertised window,
hexley	0:281d6ff68967	551	* but within actual available (but not yet advertised) window */
hexley	0:281d6ff68967	552	pcb->rcv_ann_wnd = 0;
hexley	0:281d6ff68967	553	} else {
hexley	0:281d6ff68967	554	/* keep the right edge of window constant */
hexley	0:281d6ff68967	555	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
hexley	0:281d6ff68967	556	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
hexley	0:281d6ff68967	557	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
hexley	0:281d6ff68967	558	}
hexley	0:281d6ff68967	559	return 0;
hexley	0:281d6ff68967	560	}
hexley	0:281d6ff68967	561	}
hexley	0:281d6ff68967	562
hexley	0:281d6ff68967	563	/**
hexley	0:281d6ff68967	564	* This function should be called by the application when it has
hexley	0:281d6ff68967	565	* processed the data. The purpose is to advertise a larger window
hexley	0:281d6ff68967	566	* when the data has been processed.
hexley	0:281d6ff68967	567	*
hexley	0:281d6ff68967	568	* @param pcb the tcp_pcb for which data is read
hexley	0:281d6ff68967	569	* @param len the amount of bytes that have been read by the application
hexley	0:281d6ff68967	570	*/
hexley	0:281d6ff68967	571	void
hexley	0:281d6ff68967	572	tcp_recved(struct tcp_pcb *pcb, u16_t len)
hexley	0:281d6ff68967	573	{
hexley	0:281d6ff68967	574	int wnd_inflation;
hexley	0:281d6ff68967	575
hexley	0:281d6ff68967	576	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
hexley	0:281d6ff68967	577	len <= 0xffff - pcb->rcv_wnd );
hexley	0:281d6ff68967	578
hexley	0:281d6ff68967	579	pcb->rcv_wnd += len;
hexley	0:281d6ff68967	580	if (pcb->rcv_wnd > TCP_WND) {
hexley	0:281d6ff68967	581	pcb->rcv_wnd = TCP_WND;
hexley	0:281d6ff68967	582	}
hexley	0:281d6ff68967	583
hexley	0:281d6ff68967	584	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
hexley	0:281d6ff68967	585
hexley	0:281d6ff68967	586	/* If the change in the right edge of window is significant (default
hexley	0:281d6ff68967	587	* watermark is TCP_WND/4), then send an explicit update now.
hexley	0:281d6ff68967	588	* Otherwise wait for a packet to be sent in the normal course of
hexley	0:281d6ff68967	589	* events (or more window to be available later) */
hexley	0:281d6ff68967	590	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
hexley	0:281d6ff68967	591	tcp_ack_now(pcb);
hexley	0:281d6ff68967	592	tcp_output(pcb);
hexley	0:281d6ff68967	593	}
hexley	0:281d6ff68967	594
hexley	0:281d6ff68967	595	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
hexley	0:281d6ff68967	596	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
hexley	0:281d6ff68967	597	}
hexley	0:281d6ff68967	598
hexley	0:281d6ff68967	599	/**
hexley	0:281d6ff68967	600	* A nastly hack featuring 'goto' statements that allocates a
hexley	0:281d6ff68967	601	* new TCP local port.
hexley	0:281d6ff68967	602	*
hexley	0:281d6ff68967	603	* @return a new (free) local TCP port number
hexley	0:281d6ff68967	604	*/
hexley	0:281d6ff68967	605	static u16_t
hexley	0:281d6ff68967	606	tcp_new_port(void)
hexley	0:281d6ff68967	607	{
hexley	0:281d6ff68967	608	int i;
hexley	0:281d6ff68967	609	struct tcp_pcb *pcb;
hexley	0:281d6ff68967	610	#ifndef TCP_LOCAL_PORT_RANGE_START
hexley	0:281d6ff68967	611	#define TCP_LOCAL_PORT_RANGE_START 4096
hexley	0:281d6ff68967	612	#define TCP_LOCAL_PORT_RANGE_END 0x7fff
hexley	0:281d6ff68967	613	#endif
hexley	0:281d6ff68967	614	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
hexley	0:281d6ff68967	615
hexley	0:281d6ff68967	616	again:
hexley	0:281d6ff68967	617	if (++port > TCP_LOCAL_PORT_RANGE_END) {
hexley	0:281d6ff68967	618	port = TCP_LOCAL_PORT_RANGE_START;
hexley	0:281d6ff68967	619	}
hexley	0:281d6ff68967	620	/* Check all PCB lists. */
hexley	0:281d6ff68967	621	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
hexley	0:281d6ff68967	622	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
hexley	0:281d6ff68967	623	if (pcb->local_port == port) {
hexley	0:281d6ff68967	624	goto again;
hexley	0:281d6ff68967	625	}
hexley	0:281d6ff68967	626	}
hexley	0:281d6ff68967	627	}
hexley	0:281d6ff68967	628	return port;
hexley	0:281d6ff68967	629	}
hexley	0:281d6ff68967	630
hexley	0:281d6ff68967	631	/**
hexley	0:281d6ff68967	632	* Connects to another host. The function given as the "connected"
hexley	0:281d6ff68967	633	* argument will be called when the connection has been established.
hexley	0:281d6ff68967	634	*
hexley	0:281d6ff68967	635	* @param pcb the tcp_pcb used to establish the connection
hexley	0:281d6ff68967	636	* @param ipaddr the remote ip address to connect to
hexley	0:281d6ff68967	637	* @param port the remote tcp port to connect to
hexley	0:281d6ff68967	638	* @param connected callback function to call when connected (or on error)
hexley	0:281d6ff68967	639	* @return ERR_VAL if invalid arguments are given
hexley	0:281d6ff68967	640	* ERR_OK if connect request has been sent
hexley	0:281d6ff68967	641	* other err_t values if connect request couldn't be sent
hexley	0:281d6ff68967	642	*/
hexley	0:281d6ff68967	643	err_t
hexley	0:281d6ff68967	644	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
hexley	0:281d6ff68967	645	tcp_connected_fn connected)
hexley	0:281d6ff68967	646	{
hexley	0:281d6ff68967	647	err_t ret;
hexley	0:281d6ff68967	648	u32_t iss;
hexley	0:281d6ff68967	649
hexley	0:281d6ff68967	650	LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
hexley	0:281d6ff68967	651
hexley	0:281d6ff68967	652	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
hexley	0:281d6ff68967	653	if (ipaddr != NULL) {
hexley	0:281d6ff68967	654	pcb->remote_ip = *ipaddr;
hexley	0:281d6ff68967	655	} else {
hexley	0:281d6ff68967	656	return ERR_VAL;
hexley	0:281d6ff68967	657	}
hexley	0:281d6ff68967	658	pcb->remote_port = port;
hexley	0:281d6ff68967	659
hexley	0:281d6ff68967	660	/* check if we have a route to the remote host */
hexley	0:281d6ff68967	661	if (ip_addr_isany(&(pcb->local_ip))) {
hexley	0:281d6ff68967	662	/* no local IP address set, yet. */
hexley	0:281d6ff68967	663	struct netif *netif = ip_route(&(pcb->remote_ip));
hexley	0:281d6ff68967	664	if (netif == NULL) {
hexley	0:281d6ff68967	665	/* Don't even try to send a SYN packet if we have no route
hexley	0:281d6ff68967	666	since that will fail. */
hexley	0:281d6ff68967	667	return ERR_RTE;
hexley	0:281d6ff68967	668	}
hexley	0:281d6ff68967	669	/* Use the netif's IP address as local address. */
hexley	0:281d6ff68967	670	ip_addr_copy(pcb->local_ip, netif->ip_addr);
hexley	0:281d6ff68967	671	}
hexley	0:281d6ff68967	672
hexley	0:281d6ff68967	673	if (pcb->local_port == 0) {
hexley	0:281d6ff68967	674	pcb->local_port = tcp_new_port();
hexley	0:281d6ff68967	675	}
hexley	0:281d6ff68967	676	#if SO_REUSE
hexley	0:281d6ff68967	677	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
hexley	0:281d6ff68967	678	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
hexley	0:281d6ff68967	679	now that the 5-tuple is unique. */
hexley	0:281d6ff68967	680	struct tcp_pcb *cpcb;
hexley	0:281d6ff68967	681	int i;
hexley	0:281d6ff68967	682	/* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
hexley	0:281d6ff68967	683	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
hexley	0:281d6ff68967	684	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
hexley	0:281d6ff68967	685	if ((cpcb->local_port == pcb->local_port) &&
hexley	0:281d6ff68967	686	(cpcb->remote_port == port) &&
hexley	0:281d6ff68967	687	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
hexley	0:281d6ff68967	688	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
hexley	0:281d6ff68967	689	/* linux returns EISCONN here, but ERR_USE should be OK for us */
hexley	0:281d6ff68967	690	return ERR_USE;
hexley	0:281d6ff68967	691	}
hexley	0:281d6ff68967	692	}
hexley	0:281d6ff68967	693	}
hexley	0:281d6ff68967	694	}
hexley	0:281d6ff68967	695	#endif /* SO_REUSE */
hexley	0:281d6ff68967	696	iss = tcp_next_iss();
hexley	0:281d6ff68967	697	pcb->rcv_nxt = 0;
hexley	0:281d6ff68967	698	pcb->snd_nxt = iss;
hexley	0:281d6ff68967	699	pcb->lastack = iss - 1;
hexley	0:281d6ff68967	700	pcb->snd_lbb = iss - 1;
hexley	0:281d6ff68967	701	pcb->rcv_wnd = TCP_WND;
hexley	0:281d6ff68967	702	pcb->rcv_ann_wnd = TCP_WND;
hexley	0:281d6ff68967	703	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
hexley	0:281d6ff68967	704	pcb->snd_wnd = TCP_WND;
hexley	0:281d6ff68967	705	/* As initial send MSS, we use TCP_MSS but limit it to 536.
hexley	0:281d6ff68967	706	The send MSS is updated when an MSS option is received. */
hexley	0:281d6ff68967	707	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
hexley	0:281d6ff68967	708	#if TCP_CALCULATE_EFF_SEND_MSS
hexley	0:281d6ff68967	709	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
hexley	0:281d6ff68967	710	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
hexley	0:281d6ff68967	711	pcb->cwnd = 1;
hexley	0:281d6ff68967	712	pcb->ssthresh = pcb->mss * 10;
hexley	0:281d6ff68967	713	#if LWIP_CALLBACK_API
hexley	0:281d6ff68967	714	pcb->connected = connected;
hexley	0:281d6ff68967	715	#else /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	716	LWIP_UNUSED_ARG(connected);
hexley	0:281d6ff68967	717	#endif /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	718
hexley	0:281d6ff68967	719	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
hexley	0:281d6ff68967	720
hexley	0:281d6ff68967	721	/* Send a SYN together with the MSS option. */
hexley	0:281d6ff68967	722	ret = tcp_enqueue_flags(pcb, TCP_SYN);
hexley	0:281d6ff68967	723	if (ret == ERR_OK) {
hexley	0:281d6ff68967	724	/* SYN segment was enqueued, changed the pcbs state now */
hexley	0:281d6ff68967	725	pcb->state = SYN_SENT;
hexley	0:281d6ff68967	726	TCP_RMV(&tcp_bound_pcbs, pcb);
hexley	0:281d6ff68967	727	TCP_REG(&tcp_active_pcbs, pcb);
hexley	0:281d6ff68967	728	snmp_inc_tcpactiveopens();
hexley	0:281d6ff68967	729
hexley	0:281d6ff68967	730	tcp_output(pcb);
hexley	0:281d6ff68967	731	}
hexley	0:281d6ff68967	732	return ret;
hexley	0:281d6ff68967	733	}
hexley	0:281d6ff68967	734
hexley	0:281d6ff68967	735	/**
hexley	0:281d6ff68967	736	* Called every 500 ms and implements the retransmission timer and the timer that
hexley	0:281d6ff68967	737	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
hexley	0:281d6ff68967	738	* various timers such as the inactivity timer in each PCB.
hexley	0:281d6ff68967	739	*
hexley	0:281d6ff68967	740	* Automatically called from tcp_tmr().
hexley	0:281d6ff68967	741	*/
hexley	0:281d6ff68967	742	void
hexley	0:281d6ff68967	743	tcp_slowtmr(void)
hexley	0:281d6ff68967	744	{
hexley	0:281d6ff68967	745	struct tcp_pcb pcb, pcb2, *prev;
hexley	0:281d6ff68967	746	u16_t eff_wnd;
hexley	0:281d6ff68967	747	u8_t pcb_remove; /* flag if a PCB should be removed */
hexley	0:281d6ff68967	748	u8_t pcb_reset; /* flag if a RST should be sent when removing */
hexley	0:281d6ff68967	749	err_t err;
hexley	0:281d6ff68967	750
hexley	0:281d6ff68967	751	tcp_debug_print_pcbs(); //DG
hexley	0:281d6ff68967	752
hexley	0:281d6ff68967	753	err = ERR_OK;
hexley	0:281d6ff68967	754
hexley	0:281d6ff68967	755	++tcp_ticks;
hexley	0:281d6ff68967	756	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
hexley	0:281d6ff68967	757
hexley	0:281d6ff68967	758	/* Steps through all of the active PCBs. */
hexley	0:281d6ff68967	759	prev = NULL;
hexley	0:281d6ff68967	760	pcb = tcp_active_pcbs;
hexley	0:281d6ff68967	761	if (pcb == NULL) {
hexley	0:281d6ff68967	762	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
hexley	0:281d6ff68967	763	}
hexley	0:281d6ff68967	764	while (pcb != NULL) {
hexley	0:281d6ff68967	765	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
hexley	0:281d6ff68967	766	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
hexley	0:281d6ff68967	767	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
hexley	0:281d6ff68967	768	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
hexley	0:281d6ff68967	769
hexley	0:281d6ff68967	770	pcb_remove = 0;
hexley	0:281d6ff68967	771	pcb_reset = 0;
hexley	0:281d6ff68967	772
hexley	0:281d6ff68967	773	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
hexley	0:281d6ff68967	774	++pcb_remove;
hexley	0:281d6ff68967	775	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
hexley	0:281d6ff68967	776	}
hexley	0:281d6ff68967	777	else if (pcb->nrtx == TCP_MAXRTX) {
hexley	0:281d6ff68967	778	++pcb_remove;
hexley	0:281d6ff68967	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
hexley	0:281d6ff68967	780	} else {
hexley	0:281d6ff68967	781	if (pcb->persist_backoff > 0) {
hexley	0:281d6ff68967	782	/* If snd_wnd is zero, use persist timer to send 1 byte probes
hexley	0:281d6ff68967	783	* instead of using the standard retransmission mechanism. */
hexley	0:281d6ff68967	784	pcb->persist_cnt++;
hexley	0:281d6ff68967	785	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
hexley	0:281d6ff68967	786	pcb->persist_cnt = 0;
hexley	0:281d6ff68967	787	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
hexley	0:281d6ff68967	788	pcb->persist_backoff++;
hexley	0:281d6ff68967	789	}
hexley	0:281d6ff68967	790	tcp_zero_window_probe(pcb);
hexley	0:281d6ff68967	791	}
hexley	0:281d6ff68967	792	} else {
hexley	0:281d6ff68967	793	/* Increase the retransmission timer if it is running */
hexley	0:281d6ff68967	794	if(pcb->rtime >= 0)
hexley	0:281d6ff68967	795	++pcb->rtime;
hexley	0:281d6ff68967	796
hexley	0:281d6ff68967	797	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
hexley	0:281d6ff68967	798	/* Time for a retransmission. */
hexley	0:281d6ff68967	799	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
hexley	0:281d6ff68967	800	" pcb->rto %"S16_F"\n",
hexley	0:281d6ff68967	801	pcb->rtime, pcb->rto));
hexley	0:281d6ff68967	802
hexley	0:281d6ff68967	803	/* Double retransmission time-out unless we are trying to
hexley	0:281d6ff68967	804	* connect to somebody (i.e., we are in SYN_SENT). */
hexley	0:281d6ff68967	805	if (pcb->state != SYN_SENT) {
hexley	0:281d6ff68967	806	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
hexley	0:281d6ff68967	807	}
hexley	0:281d6ff68967	808
hexley	0:281d6ff68967	809	/* Reset the retransmission timer. */
hexley	0:281d6ff68967	810	pcb->rtime = 0;
hexley	0:281d6ff68967	811
hexley	0:281d6ff68967	812	/* Reduce congestion window and ssthresh. */
hexley	0:281d6ff68967	813	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
hexley	0:281d6ff68967	814	pcb->ssthresh = eff_wnd >> 1;
hexley	0:281d6ff68967	815	if (pcb->ssthresh < (pcb->mss << 1)) {
hexley	0:281d6ff68967	816	pcb->ssthresh = (pcb->mss << 1);
hexley	0:281d6ff68967	817	}
hexley	0:281d6ff68967	818	pcb->cwnd = pcb->mss;
hexley	0:281d6ff68967	819	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
hexley	0:281d6ff68967	820	" ssthresh %"U16_F"\n",
hexley	0:281d6ff68967	821	pcb->cwnd, pcb->ssthresh));
hexley	0:281d6ff68967	822
hexley	0:281d6ff68967	823	/* The following needs to be called AFTER cwnd is set to one
hexley	0:281d6ff68967	824	mss - STJ */
hexley	0:281d6ff68967	825	tcp_rexmit_rto(pcb);
hexley	0:281d6ff68967	826	}
hexley	0:281d6ff68967	827	}
hexley	0:281d6ff68967	828	}
hexley	0:281d6ff68967	829	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
hexley	0:281d6ff68967	830	if (pcb->state == FIN_WAIT_2) {
hexley	0:281d6ff68967	831	if ((u32_t)(tcp_ticks - pcb->tmr) >
hexley	0:281d6ff68967	832	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
hexley	0:281d6ff68967	833	++pcb_remove;
hexley	0:281d6ff68967	834	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
hexley	0:281d6ff68967	835	}
hexley	0:281d6ff68967	836	}
hexley	0:281d6ff68967	837
hexley	0:281d6ff68967	838	/* Check if KEEPALIVE should be sent */
hexley	0:281d6ff68967	839	if((pcb->so_options & SOF_KEEPALIVE) &&
hexley	0:281d6ff68967	840	((pcb->state == ESTABLISHED) \|\|
hexley	0:281d6ff68967	841	(pcb->state == CLOSE_WAIT))) {
hexley	0:281d6ff68967	842	#if LWIP_TCP_KEEPALIVE
hexley	0:281d6ff68967	843	if((u32_t)(tcp_ticks - pcb->tmr) >
hexley	0:281d6ff68967	844	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
hexley	0:281d6ff68967	845	/ TCP_SLOW_INTERVAL)
hexley	0:281d6ff68967	846	#else
hexley	0:281d6ff68967	847	if((u32_t)(tcp_ticks - pcb->tmr) >
hexley	0:281d6ff68967	848	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
hexley	0:281d6ff68967	849	#endif /* LWIP_TCP_KEEPALIVE */
hexley	0:281d6ff68967	850	{
hexley	0:281d6ff68967	851	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
hexley	0:281d6ff68967	852	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
hexley	0:281d6ff68967	853	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
hexley	0:281d6ff68967	854
hexley	0:281d6ff68967	855	++pcb_remove;
hexley	0:281d6ff68967	856	++pcb_reset;
hexley	0:281d6ff68967	857	}
hexley	0:281d6ff68967	858	#if LWIP_TCP_KEEPALIVE
hexley	0:281d6ff68967	859	else if((u32_t)(tcp_ticks - pcb->tmr) >
hexley	0:281d6ff68967	860	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
hexley	0:281d6ff68967	861	/ TCP_SLOW_INTERVAL)
hexley	0:281d6ff68967	862	#else
hexley	0:281d6ff68967	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
hexley	0:281d6ff68967	864	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
hexley	0:281d6ff68967	865	/ TCP_SLOW_INTERVAL)
hexley	0:281d6ff68967	866	#endif /* LWIP_TCP_KEEPALIVE */
hexley	0:281d6ff68967	867	{
hexley	0:281d6ff68967	868	tcp_keepalive(pcb);
hexley	0:281d6ff68967	869	pcb->keep_cnt_sent++;
hexley	0:281d6ff68967	870	}
hexley	0:281d6ff68967	871	}
hexley	0:281d6ff68967	872
hexley	0:281d6ff68967	873	/* If this PCB has queued out of sequence data, but has been
hexley	0:281d6ff68967	874	inactive for too long, will drop the data (it will eventually
hexley	0:281d6ff68967	875	be retransmitted). */
hexley	0:281d6ff68967	876	#if TCP_QUEUE_OOSEQ
hexley	0:281d6ff68967	877	if (pcb->ooseq != NULL &&
hexley	0:281d6ff68967	878	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
hexley	0:281d6ff68967	879	tcp_segs_free(pcb->ooseq);
hexley	0:281d6ff68967	880	pcb->ooseq = NULL;
hexley	0:281d6ff68967	881	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
hexley	0:281d6ff68967	882	}
hexley	0:281d6ff68967	883	#endif /* TCP_QUEUE_OOSEQ */
hexley	0:281d6ff68967	884
hexley	0:281d6ff68967	885	/* Check if this PCB has stayed too long in SYN-RCVD */
hexley	0:281d6ff68967	886	if (pcb->state == SYN_RCVD) {
hexley	0:281d6ff68967	887	if ((u32_t)(tcp_ticks - pcb->tmr) >
hexley	0:281d6ff68967	888	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
hexley	0:281d6ff68967	889	++pcb_remove;
hexley	0:281d6ff68967	890	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
hexley	0:281d6ff68967	891	}
hexley	0:281d6ff68967	892	}
hexley	0:281d6ff68967	893
hexley	0:281d6ff68967	894	/* Check if this PCB has stayed too long in LAST-ACK */
hexley	0:281d6ff68967	895	if (pcb->state == LAST_ACK) {
hexley	0:281d6ff68967	896	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
hexley	0:281d6ff68967	897	++pcb_remove;
hexley	0:281d6ff68967	898	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
hexley	0:281d6ff68967	899	}
hexley	0:281d6ff68967	900	}
hexley	0:281d6ff68967	901
hexley	0:281d6ff68967	902	/* If the PCB should be removed, do it. */
hexley	0:281d6ff68967	903	if (pcb_remove) {
hexley	0:281d6ff68967	904	tcp_pcb_purge(pcb);
hexley	0:281d6ff68967	905	/* Remove PCB from tcp_active_pcbs list. */
hexley	0:281d6ff68967	906	if (prev != NULL) {
hexley	0:281d6ff68967	907	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
hexley	0:281d6ff68967	908	prev->next = pcb->next;
hexley	0:281d6ff68967	909	} else {
hexley	0:281d6ff68967	910	/* This PCB was the first. */
hexley	0:281d6ff68967	911	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
hexley	0:281d6ff68967	912	tcp_active_pcbs = pcb->next;
hexley	0:281d6ff68967	913	}
hexley	0:281d6ff68967	914
hexley	0:281d6ff68967	915	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
hexley	0:281d6ff68967	916	if (pcb_reset) {
hexley	0:281d6ff68967	917	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
hexley	0:281d6ff68967	918	pcb->local_port, pcb->remote_port);
hexley	0:281d6ff68967	919	}
hexley	0:281d6ff68967	920
hexley	0:281d6ff68967	921	pcb2 = pcb->next;
hexley	0:281d6ff68967	922	memp_free(MEMP_TCP_PCB, pcb);
hexley	0:281d6ff68967	923	pcb = pcb2;
hexley	0:281d6ff68967	924	} else {
hexley	0:281d6ff68967	925	/* get the 'next' element now and work with 'prev' below (in case of abort) */
hexley	0:281d6ff68967	926	prev = pcb;
hexley	0:281d6ff68967	927	pcb = pcb->next;
hexley	0:281d6ff68967	928
hexley	0:281d6ff68967	929	/* We check if we should poll the connection. */
hexley	0:281d6ff68967	930	++prev->polltmr;
hexley	0:281d6ff68967	931	if (prev->polltmr >= prev->pollinterval) {
hexley	0:281d6ff68967	932	prev->polltmr = 0;
hexley	0:281d6ff68967	933	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
hexley	0:281d6ff68967	934	TCP_EVENT_POLL(prev, err);
hexley	0:281d6ff68967	935	/* if err == ERR_ABRT, 'prev' is already deallocated */
hexley	0:281d6ff68967	936	if (err == ERR_OK) {
hexley	0:281d6ff68967	937	tcp_output(prev);
hexley	0:281d6ff68967	938	}
hexley	0:281d6ff68967	939	}
hexley	0:281d6ff68967	940	}
hexley	0:281d6ff68967	941	}
hexley	0:281d6ff68967	942
hexley	0:281d6ff68967	943
hexley	0:281d6ff68967	944	/* Steps through all of the TIME-WAIT PCBs. */
hexley	0:281d6ff68967	945	prev = NULL;
hexley	0:281d6ff68967	946	pcb = tcp_tw_pcbs;
hexley	0:281d6ff68967	947	while (pcb != NULL) {
hexley	0:281d6ff68967	948	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
hexley	0:281d6ff68967	949	pcb_remove = 0;
hexley	0:281d6ff68967	950
hexley	0:281d6ff68967	951	/* Check if this PCB has stayed long enough in TIME-WAIT */
hexley	0:281d6ff68967	952	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
hexley	0:281d6ff68967	953	++pcb_remove;
hexley	0:281d6ff68967	954	}
hexley	0:281d6ff68967	955
hexley	0:281d6ff68967	956
hexley	0:281d6ff68967	957
hexley	0:281d6ff68967	958	/* If the PCB should be removed, do it. */
hexley	0:281d6ff68967	959	if (pcb_remove) {
hexley	0:281d6ff68967	960	tcp_pcb_purge(pcb);
hexley	0:281d6ff68967	961	/* Remove PCB from tcp_tw_pcbs list. */
hexley	0:281d6ff68967	962	if (prev != NULL) {
hexley	0:281d6ff68967	963	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
hexley	0:281d6ff68967	964	prev->next = pcb->next;
hexley	0:281d6ff68967	965	} else {
hexley	0:281d6ff68967	966	/* This PCB was the first. */
hexley	0:281d6ff68967	967	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
hexley	0:281d6ff68967	968	tcp_tw_pcbs = pcb->next;
hexley	0:281d6ff68967	969	}
hexley	0:281d6ff68967	970	pcb2 = pcb->next;
hexley	0:281d6ff68967	971	memp_free(MEMP_TCP_PCB, pcb);
hexley	0:281d6ff68967	972	pcb = pcb2;
hexley	0:281d6ff68967	973	} else {
hexley	0:281d6ff68967	974	prev = pcb;
hexley	0:281d6ff68967	975	pcb = pcb->next;
hexley	0:281d6ff68967	976	}
hexley	0:281d6ff68967	977	}
hexley	0:281d6ff68967	978	}
hexley	0:281d6ff68967	979
hexley	0:281d6ff68967	980	/**
hexley	0:281d6ff68967	981	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
hexley	0:281d6ff68967	982	* "refused" by upper layer (application) and sends delayed ACKs.
hexley	0:281d6ff68967	983	*
hexley	0:281d6ff68967	984	* Automatically called from tcp_tmr().
hexley	0:281d6ff68967	985	*/
hexley	0:281d6ff68967	986	void
hexley	0:281d6ff68967	987	tcp_fasttmr(void)
hexley	0:281d6ff68967	988	{
hexley	0:281d6ff68967	989	struct tcp_pcb *pcb = tcp_active_pcbs;
hexley	0:281d6ff68967	990
hexley	0:281d6ff68967	991	while(pcb != NULL) {
hexley	0:281d6ff68967	992	struct tcp_pcb *next = pcb->next;
hexley	0:281d6ff68967	993	/* If there is data which was previously "refused" by upper layer */
hexley	0:281d6ff68967	994	if (pcb->refused_data != NULL) {
hexley	0:281d6ff68967	995	/* Notify again application with data previously received. */
hexley	0:281d6ff68967	996	err_t err;
hexley	0:281d6ff68967	997	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
hexley	0:281d6ff68967	998	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
hexley	0:281d6ff68967	999	if (err == ERR_OK) {
hexley	0:281d6ff68967	1000	pcb->refused_data = NULL;
hexley	0:281d6ff68967	1001	} else if (err == ERR_ABRT) {
hexley	0:281d6ff68967	1002	/* if err == ERR_ABRT, 'pcb' is already deallocated */
hexley	0:281d6ff68967	1003	pcb = NULL;
hexley	0:281d6ff68967	1004	}
hexley	0:281d6ff68967	1005	}
hexley	0:281d6ff68967	1006
hexley	0:281d6ff68967	1007	/* send delayed ACKs */
hexley	0:281d6ff68967	1008	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
hexley	0:281d6ff68967	1009	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
hexley	0:281d6ff68967	1010	tcp_ack_now(pcb);
hexley	0:281d6ff68967	1011	tcp_output(pcb);
hexley	0:281d6ff68967	1012	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
hexley	0:281d6ff68967	1013	}
hexley	0:281d6ff68967	1014
hexley	0:281d6ff68967	1015	pcb = next;
hexley	0:281d6ff68967	1016	}
hexley	0:281d6ff68967	1017	}
hexley	0:281d6ff68967	1018
hexley	0:281d6ff68967	1019	/**
hexley	0:281d6ff68967	1020	* Deallocates a list of TCP segments (tcp_seg structures).
hexley	0:281d6ff68967	1021	*
hexley	0:281d6ff68967	1022	* @param seg tcp_seg list of TCP segments to free
hexley	0:281d6ff68967	1023	*/
hexley	0:281d6ff68967	1024	void
hexley	0:281d6ff68967	1025	tcp_segs_free(struct tcp_seg *seg)
hexley	0:281d6ff68967	1026	{
hexley	0:281d6ff68967	1027	while (seg != NULL) {
hexley	0:281d6ff68967	1028	struct tcp_seg *next = seg->next;
hexley	0:281d6ff68967	1029	tcp_seg_free(seg);
hexley	0:281d6ff68967	1030	seg = next;
hexley	0:281d6ff68967	1031	}
hexley	0:281d6ff68967	1032	}
hexley	0:281d6ff68967	1033
hexley	0:281d6ff68967	1034	/**
hexley	0:281d6ff68967	1035	* Frees a TCP segment (tcp_seg structure).
hexley	0:281d6ff68967	1036	*
hexley	0:281d6ff68967	1037	* @param seg single tcp_seg to free
hexley	0:281d6ff68967	1038	*/
hexley	0:281d6ff68967	1039	void
hexley	0:281d6ff68967	1040	tcp_seg_free(struct tcp_seg *seg)
hexley	0:281d6ff68967	1041	{
hexley	0:281d6ff68967	1042	if (seg != NULL) {
hexley	0:281d6ff68967	1043	if (seg->p != NULL) {
hexley	0:281d6ff68967	1044	pbuf_free(seg->p);
hexley	0:281d6ff68967	1045	#if TCP_DEBUG
hexley	0:281d6ff68967	1046	seg->p = NULL;
hexley	0:281d6ff68967	1047	#endif /* TCP_DEBUG */
hexley	0:281d6ff68967	1048	}
hexley	0:281d6ff68967	1049	memp_free(MEMP_TCP_SEG, seg);
hexley	0:281d6ff68967	1050	}
hexley	0:281d6ff68967	1051	}
hexley	0:281d6ff68967	1052
hexley	0:281d6ff68967	1053	/**
hexley	0:281d6ff68967	1054	* Sets the priority of a connection.
hexley	0:281d6ff68967	1055	*
hexley	0:281d6ff68967	1056	* @param pcb the tcp_pcb to manipulate
hexley	0:281d6ff68967	1057	* @param prio new priority
hexley	0:281d6ff68967	1058	*/
hexley	0:281d6ff68967	1059	void
hexley	0:281d6ff68967	1060	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
hexley	0:281d6ff68967	1061	{
hexley	0:281d6ff68967	1062	pcb->prio = prio;
hexley	0:281d6ff68967	1063	}
hexley	0:281d6ff68967	1064
hexley	0:281d6ff68967	1065	#if TCP_QUEUE_OOSEQ
hexley	0:281d6ff68967	1066	/**
hexley	0:281d6ff68967	1067	* Returns a copy of the given TCP segment.
hexley	0:281d6ff68967	1068	* The pbuf and data are not copied, only the pointers
hexley	0:281d6ff68967	1069	*
hexley	0:281d6ff68967	1070	* @param seg the old tcp_seg
hexley	0:281d6ff68967	1071	* @return a copy of seg
hexley	0:281d6ff68967	1072	*/
hexley	0:281d6ff68967	1073	struct tcp_seg *
hexley	0:281d6ff68967	1074	tcp_seg_copy(struct tcp_seg *seg)
hexley	0:281d6ff68967	1075	{
hexley	0:281d6ff68967	1076	struct tcp_seg *cseg;
hexley	0:281d6ff68967	1077
hexley	0:281d6ff68967	1078	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
hexley	0:281d6ff68967	1079	if (cseg == NULL) {
hexley	0:281d6ff68967	1080	return NULL;
hexley	0:281d6ff68967	1081	}
hexley	0:281d6ff68967	1082	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
hexley	0:281d6ff68967	1083	pbuf_ref(cseg->p);
hexley	0:281d6ff68967	1084	return cseg;
hexley	0:281d6ff68967	1085	}
hexley	0:281d6ff68967	1086	#endif /* TCP_QUEUE_OOSEQ */
hexley	0:281d6ff68967	1087
hexley	0:281d6ff68967	1088	#if LWIP_CALLBACK_API
hexley	0:281d6ff68967	1089	/**
hexley	0:281d6ff68967	1090	* Default receive callback that is called if the user didn't register
hexley	0:281d6ff68967	1091	* a recv callback for the pcb.
hexley	0:281d6ff68967	1092	*/
hexley	0:281d6ff68967	1093	err_t
hexley	0:281d6ff68967	1094	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
hexley	0:281d6ff68967	1095	{
hexley	0:281d6ff68967	1096	LWIP_UNUSED_ARG(arg);
hexley	0:281d6ff68967	1097	if (p != NULL) {
hexley	0:281d6ff68967	1098	tcp_recved(pcb, p->tot_len);
hexley	0:281d6ff68967	1099	pbuf_free(p);
hexley	0:281d6ff68967	1100	} else if (err == ERR_OK) {
hexley	0:281d6ff68967	1101	return tcp_close(pcb);
hexley	0:281d6ff68967	1102	}
hexley	0:281d6ff68967	1103	return ERR_OK;
hexley	0:281d6ff68967	1104	}
hexley	0:281d6ff68967	1105	#endif /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	1106
hexley	0:281d6ff68967	1107	/**
hexley	0:281d6ff68967	1108	* Kills the oldest active connection that has lower priority than prio.
hexley	0:281d6ff68967	1109	*
hexley	0:281d6ff68967	1110	* @param prio minimum priority
hexley	0:281d6ff68967	1111	*/
hexley	0:281d6ff68967	1112	static void
hexley	0:281d6ff68967	1113	tcp_kill_prio(u8_t prio)
hexley	0:281d6ff68967	1114	{
hexley	0:281d6ff68967	1115	struct tcp_pcb pcb, inactive;
hexley	0:281d6ff68967	1116	u32_t inactivity;
hexley	0:281d6ff68967	1117	u8_t mprio;
hexley	0:281d6ff68967	1118
hexley	0:281d6ff68967	1119
hexley	0:281d6ff68967	1120	mprio = TCP_PRIO_MAX;
hexley	0:281d6ff68967	1121
hexley	0:281d6ff68967	1122	/* We kill the oldest active connection that has lower priority than prio. */
hexley	0:281d6ff68967	1123	inactivity = 0;
hexley	0:281d6ff68967	1124	inactive = NULL;
hexley	0:281d6ff68967	1125	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
hexley	0:281d6ff68967	1126	if (pcb->prio <= prio &&
hexley	0:281d6ff68967	1127	pcb->prio <= mprio &&
hexley	0:281d6ff68967	1128	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
hexley	0:281d6ff68967	1129	inactivity = tcp_ticks - pcb->tmr;
hexley	0:281d6ff68967	1130	inactive = pcb;
hexley	0:281d6ff68967	1131	mprio = pcb->prio;
hexley	0:281d6ff68967	1132	}
hexley	0:281d6ff68967	1133	}
hexley	0:281d6ff68967	1134	if (inactive != NULL) {
hexley	0:281d6ff68967	1135	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
hexley	0:281d6ff68967	1136	(void *)inactive, inactivity));
hexley	0:281d6ff68967	1137	tcp_abort(inactive);
hexley	0:281d6ff68967	1138	}
hexley	0:281d6ff68967	1139	}
hexley	0:281d6ff68967	1140
hexley	0:281d6ff68967	1141	/**
hexley	0:281d6ff68967	1142	* Kills the oldest connection that is in TIME_WAIT state.
hexley	0:281d6ff68967	1143	* Called from tcp_alloc() if no more connections are available.
hexley	0:281d6ff68967	1144	*/
hexley	0:281d6ff68967	1145	static void
hexley	0:281d6ff68967	1146	tcp_kill_timewait(void)
hexley	0:281d6ff68967	1147	{
hexley	0:281d6ff68967	1148	struct tcp_pcb pcb, inactive;
hexley	0:281d6ff68967	1149	u32_t inactivity;
hexley	0:281d6ff68967	1150
hexley	0:281d6ff68967	1151	inactivity = 0;
hexley	0:281d6ff68967	1152	inactive = NULL;
hexley	0:281d6ff68967	1153	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
hexley	0:281d6ff68967	1154	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
hexley	0:281d6ff68967	1155	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
hexley	0:281d6ff68967	1156	inactivity = tcp_ticks - pcb->tmr;
hexley	0:281d6ff68967	1157	inactive = pcb;
hexley	0:281d6ff68967	1158	}
hexley	0:281d6ff68967	1159	}
hexley	0:281d6ff68967	1160	if (inactive != NULL) {
hexley	0:281d6ff68967	1161	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
hexley	0:281d6ff68967	1162	(void *)inactive, inactivity));
hexley	0:281d6ff68967	1163	tcp_abort(inactive);
hexley	0:281d6ff68967	1164	}
hexley	0:281d6ff68967	1165	}
hexley	0:281d6ff68967	1166
hexley	0:281d6ff68967	1167	/**
hexley	0:281d6ff68967	1168	* Allocate a new tcp_pcb structure.
hexley	0:281d6ff68967	1169	*
hexley	0:281d6ff68967	1170	* @param prio priority for the new pcb
hexley	0:281d6ff68967	1171	* @return a new tcp_pcb that initially is in state CLOSED
hexley	0:281d6ff68967	1172	*/
hexley	0:281d6ff68967	1173	struct tcp_pcb *
hexley	0:281d6ff68967	1174	tcp_alloc(u8_t prio)
hexley	0:281d6ff68967	1175	{
hexley	0:281d6ff68967	1176	struct tcp_pcb *pcb;
hexley	0:281d6ff68967	1177	u32_t iss;
hexley	0:281d6ff68967	1178
hexley	0:281d6ff68967	1179	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
hexley	0:281d6ff68967	1180	if (pcb == NULL) {
hexley	0:281d6ff68967	1181	/* Try killing oldest connection in TIME-WAIT. */
hexley	0:281d6ff68967	1182	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
hexley	0:281d6ff68967	1183	tcp_kill_timewait();
hexley	0:281d6ff68967	1184	/* Try to allocate a tcp_pcb again. */
hexley	0:281d6ff68967	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
hexley	0:281d6ff68967	1186	if (pcb == NULL) {
hexley	0:281d6ff68967	1187	/* Try killing active connections with lower priority than the new one. */
hexley	0:281d6ff68967	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
hexley	0:281d6ff68967	1189	tcp_kill_prio(prio);
hexley	0:281d6ff68967	1190	/* Try to allocate a tcp_pcb again. */
hexley	0:281d6ff68967	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
hexley	0:281d6ff68967	1192	if (pcb != NULL) {
hexley	0:281d6ff68967	1193	/* adjust err stats: memp_malloc failed twice before */
hexley	0:281d6ff68967	1194	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
hexley	0:281d6ff68967	1195	}
hexley	0:281d6ff68967	1196	}
hexley	0:281d6ff68967	1197	if (pcb != NULL) {
hexley	0:281d6ff68967	1198	/* adjust err stats: timewait PCB was freed above */
hexley	0:281d6ff68967	1199	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
hexley	0:281d6ff68967	1200	}
hexley	0:281d6ff68967	1201	}
hexley	0:281d6ff68967	1202	if (pcb != NULL) {
hexley	0:281d6ff68967	1203	memset(pcb, 0, sizeof(struct tcp_pcb));
hexley	0:281d6ff68967	1204	pcb->prio = prio;
hexley	0:281d6ff68967	1205	pcb->snd_buf = TCP_SND_BUF;
hexley	0:281d6ff68967	1206	pcb->snd_queuelen = 0;
hexley	0:281d6ff68967	1207	pcb->rcv_wnd = TCP_WND;
hexley	0:281d6ff68967	1208	pcb->rcv_ann_wnd = TCP_WND;
hexley	0:281d6ff68967	1209	pcb->tos = 0;
hexley	0:281d6ff68967	1210	pcb->ttl = TCP_TTL;
hexley	0:281d6ff68967	1211	/* As initial send MSS, we use TCP_MSS but limit it to 536.
hexley	0:281d6ff68967	1212	The send MSS is updated when an MSS option is received. */
hexley	0:281d6ff68967	1213	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
hexley	0:281d6ff68967	1214	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
hexley	0:281d6ff68967	1215	pcb->sa = 0;
hexley	0:281d6ff68967	1216	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
hexley	0:281d6ff68967	1217	pcb->rtime = -1;
hexley	0:281d6ff68967	1218	pcb->cwnd = 1;
hexley	0:281d6ff68967	1219	iss = tcp_next_iss();
hexley	0:281d6ff68967	1220	pcb->snd_wl2 = iss;
hexley	0:281d6ff68967	1221	pcb->snd_nxt = iss;
hexley	0:281d6ff68967	1222	pcb->lastack = iss;
hexley	0:281d6ff68967	1223	pcb->snd_lbb = iss;
hexley	0:281d6ff68967	1224	pcb->tmr = tcp_ticks;
hexley	0:281d6ff68967	1225
hexley	0:281d6ff68967	1226	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
hexley	0:281d6ff68967	1227
hexley	0:281d6ff68967	1228	pcb->polltmr = 0;
hexley	0:281d6ff68967	1229
hexley	0:281d6ff68967	1230	#if LWIP_CALLBACK_API
hexley	0:281d6ff68967	1231	pcb->recv = tcp_recv_null;
hexley	0:281d6ff68967	1232	#endif /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	1233
hexley	0:281d6ff68967	1234	/* Init KEEPALIVE timer */
hexley	0:281d6ff68967	1235	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
hexley	0:281d6ff68967	1236
hexley	0:281d6ff68967	1237	#if LWIP_TCP_KEEPALIVE
hexley	0:281d6ff68967	1238	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
hexley	0:281d6ff68967	1239	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
hexley	0:281d6ff68967	1240	#endif /* LWIP_TCP_KEEPALIVE */
hexley	0:281d6ff68967	1241
hexley	0:281d6ff68967	1242	pcb->keep_cnt_sent = 0;
hexley	0:281d6ff68967	1243	}
hexley	0:281d6ff68967	1244	return pcb;
hexley	0:281d6ff68967	1245	}
hexley	0:281d6ff68967	1246
hexley	0:281d6ff68967	1247	/**
hexley	0:281d6ff68967	1248	* Creates a new TCP protocol control block but doesn't place it on
hexley	0:281d6ff68967	1249	* any of the TCP PCB lists.
hexley	0:281d6ff68967	1250	* The pcb is not put on any list until binding using tcp_bind().
hexley	0:281d6ff68967	1251	*
hexley	0:281d6ff68967	1252	* @internal: Maybe there should be a idle TCP PCB list where these
hexley	0:281d6ff68967	1253	* PCBs are put on. Port reservation using tcp_bind() is implemented but
hexley	0:281d6ff68967	1254	* allocated pcbs that are not bound can't be killed automatically if wanting
hexley	0:281d6ff68967	1255	* to allocate a pcb with higher prio (@see tcp_kill_prio())
hexley	0:281d6ff68967	1256	*
hexley	0:281d6ff68967	1257	* @return a new tcp_pcb that initially is in state CLOSED
hexley	0:281d6ff68967	1258	*/
hexley	0:281d6ff68967	1259	struct tcp_pcb *
hexley	0:281d6ff68967	1260	tcp_new(void)
hexley	0:281d6ff68967	1261	{
hexley	0:281d6ff68967	1262	return tcp_alloc(TCP_PRIO_NORMAL);
hexley	0:281d6ff68967	1263	}
hexley	0:281d6ff68967	1264
hexley	0:281d6ff68967	1265	/**
hexley	0:281d6ff68967	1266	* Used to specify the argument that should be passed callback
hexley	0:281d6ff68967	1267	* functions.
hexley	0:281d6ff68967	1268	*
hexley	0:281d6ff68967	1269	* @param pcb tcp_pcb to set the callback argument
hexley	0:281d6ff68967	1270	* @param arg void pointer argument to pass to callback functions
hexley	0:281d6ff68967	1271	*/
hexley	0:281d6ff68967	1272	void
hexley	0:281d6ff68967	1273	tcp_arg(struct tcp_pcb pcb, void arg)
hexley	0:281d6ff68967	1274	{
hexley	0:281d6ff68967	1275	pcb->callback_arg = arg;
hexley	0:281d6ff68967	1276	}
hexley	0:281d6ff68967	1277	#if LWIP_CALLBACK_API
hexley	0:281d6ff68967	1278
hexley	0:281d6ff68967	1279	/**
hexley	0:281d6ff68967	1280	* Used to specify the function that should be called when a TCP
hexley	0:281d6ff68967	1281	* connection receives data.
hexley	0:281d6ff68967	1282	*
hexley	0:281d6ff68967	1283	* @param pcb tcp_pcb to set the recv callback
hexley	0:281d6ff68967	1284	* @param recv callback function to call for this pcb when data is received
hexley	0:281d6ff68967	1285	*/
hexley	0:281d6ff68967	1286	void
hexley	0:281d6ff68967	1287	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
hexley	0:281d6ff68967	1288	{
hexley	0:281d6ff68967	1289	pcb->recv = recv;
hexley	0:281d6ff68967	1290	}
hexley	0:281d6ff68967	1291
hexley	0:281d6ff68967	1292	/**
hexley	0:281d6ff68967	1293	* Used to specify the function that should be called when TCP data
hexley	0:281d6ff68967	1294	* has been successfully delivered to the remote host.
hexley	0:281d6ff68967	1295	*
hexley	0:281d6ff68967	1296	* @param pcb tcp_pcb to set the sent callback
hexley	0:281d6ff68967	1297	* @param sent callback function to call for this pcb when data is successfully sent
hexley	0:281d6ff68967	1298	*/
hexley	0:281d6ff68967	1299	void
hexley	0:281d6ff68967	1300	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
hexley	0:281d6ff68967	1301	{
hexley	0:281d6ff68967	1302	pcb->sent = sent;
hexley	0:281d6ff68967	1303	}
hexley	0:281d6ff68967	1304
hexley	0:281d6ff68967	1305	/**
hexley	0:281d6ff68967	1306	* Used to specify the function that should be called when a fatal error
hexley	0:281d6ff68967	1307	* has occured on the connection.
hexley	0:281d6ff68967	1308	*
hexley	0:281d6ff68967	1309	* @param pcb tcp_pcb to set the err callback
hexley	0:281d6ff68967	1310	* @param err callback function to call for this pcb when a fatal error
hexley	0:281d6ff68967	1311	* has occured on the connection
hexley	0:281d6ff68967	1312	*/
hexley	0:281d6ff68967	1313	void
hexley	0:281d6ff68967	1314	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
hexley	0:281d6ff68967	1315	{
hexley	0:281d6ff68967	1316	pcb->errf = err;
hexley	0:281d6ff68967	1317	}
hexley	0:281d6ff68967	1318
hexley	0:281d6ff68967	1319	/**
hexley	0:281d6ff68967	1320	* Used for specifying the function that should be called when a
hexley	0:281d6ff68967	1321	* LISTENing connection has been connected to another host.
hexley	0:281d6ff68967	1322	*
hexley	0:281d6ff68967	1323	* @param pcb tcp_pcb to set the accept callback
hexley	0:281d6ff68967	1324	* @param accept callback function to call for this pcb when LISTENing
hexley	0:281d6ff68967	1325	* connection has been connected to another host
hexley	0:281d6ff68967	1326	*/
hexley	0:281d6ff68967	1327	void
hexley	0:281d6ff68967	1328	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
hexley	0:281d6ff68967	1329	{
hexley	0:281d6ff68967	1330	pcb->accept = accept;
hexley	0:281d6ff68967	1331	}
hexley	0:281d6ff68967	1332	#endif /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	1333
hexley	0:281d6ff68967	1334
hexley	0:281d6ff68967	1335	/**
hexley	0:281d6ff68967	1336	* Used to specify the function that should be called periodically
hexley	0:281d6ff68967	1337	* from TCP. The interval is specified in terms of the TCP coarse
hexley	0:281d6ff68967	1338	* timer interval, which is called twice a second.
hexley	0:281d6ff68967	1339	*
hexley	0:281d6ff68967	1340	*/
hexley	0:281d6ff68967	1341	void
hexley	0:281d6ff68967	1342	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
hexley	0:281d6ff68967	1343	{
hexley	0:281d6ff68967	1344	#if LWIP_CALLBACK_API
hexley	0:281d6ff68967	1345	pcb->poll = poll;
hexley	0:281d6ff68967	1346	#else /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	1347	LWIP_UNUSED_ARG(poll);
hexley	0:281d6ff68967	1348	#endif /* LWIP_CALLBACK_API */
hexley	0:281d6ff68967	1349	pcb->pollinterval = interval;
hexley	0:281d6ff68967	1350	}
hexley	0:281d6ff68967	1351
hexley	0:281d6ff68967	1352	/**
hexley	0:281d6ff68967	1353	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
hexley	0:281d6ff68967	1354	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
hexley	0:281d6ff68967	1355	*
hexley	0:281d6ff68967	1356	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
hexley	0:281d6ff68967	1357	*/
hexley	0:281d6ff68967	1358	void
hexley	0:281d6ff68967	1359	tcp_pcb_purge(struct tcp_pcb *pcb)
hexley	0:281d6ff68967	1360	{
hexley	0:281d6ff68967	1361	if (pcb->state != CLOSED &&
hexley	0:281d6ff68967	1362	pcb->state != TIME_WAIT &&
hexley	0:281d6ff68967	1363	pcb->state != LISTEN) {
hexley	0:281d6ff68967	1364
hexley	0:281d6ff68967	1365	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
hexley	0:281d6ff68967	1366
hexley	0:281d6ff68967	1367	#if TCP_LISTEN_BACKLOG
hexley	0:281d6ff68967	1368	if (pcb->state == SYN_RCVD) {
hexley	0:281d6ff68967	1369	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
hexley	0:281d6ff68967	1370	struct tcp_pcb_listen *lpcb;
hexley	0:281d6ff68967	1371	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
hexley	0:281d6ff68967	1372	tcp_listen_pcbs.listen_pcbs != NULL);
hexley	0:281d6ff68967	1373	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
hexley	0:281d6ff68967	1374	if ((lpcb->local_port == pcb->local_port) &&
hexley	0:281d6ff68967	1375	(ip_addr_isany(&lpcb->local_ip) \|\|
hexley	0:281d6ff68967	1376	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
hexley	0:281d6ff68967	1377	/* port and address of the listen pcb match the timed-out pcb */
hexley	0:281d6ff68967	1378	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
hexley	0:281d6ff68967	1379	lpcb->accepts_pending > 0);
hexley	0:281d6ff68967	1380	lpcb->accepts_pending--;
hexley	0:281d6ff68967	1381	break;
hexley	0:281d6ff68967	1382	}
hexley	0:281d6ff68967	1383	}
hexley	0:281d6ff68967	1384	}
hexley	0:281d6ff68967	1385	#endif /* TCP_LISTEN_BACKLOG */
hexley	0:281d6ff68967	1386
hexley	0:281d6ff68967	1387
hexley	0:281d6ff68967	1388	if (pcb->refused_data != NULL) {
hexley	0:281d6ff68967	1389	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
hexley	0:281d6ff68967	1390	pbuf_free(pcb->refused_data);
hexley	0:281d6ff68967	1391	pcb->refused_data = NULL;
hexley	0:281d6ff68967	1392	}
hexley	0:281d6ff68967	1393	if (pcb->unsent != NULL) {
hexley	0:281d6ff68967	1394	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
hexley	0:281d6ff68967	1395	}
hexley	0:281d6ff68967	1396	if (pcb->unacked != NULL) {
hexley	0:281d6ff68967	1397	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
hexley	0:281d6ff68967	1398	}
hexley	0:281d6ff68967	1399	#if TCP_QUEUE_OOSEQ
hexley	0:281d6ff68967	1400	if (pcb->ooseq != NULL) {
hexley	0:281d6ff68967	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
hexley	0:281d6ff68967	1402	}
hexley	0:281d6ff68967	1403	tcp_segs_free(pcb->ooseq);
hexley	0:281d6ff68967	1404	pcb->ooseq = NULL;
hexley	0:281d6ff68967	1405	#endif /* TCP_QUEUE_OOSEQ */
hexley	0:281d6ff68967	1406
hexley	0:281d6ff68967	1407	/* Stop the retransmission timer as it will expect data on unacked
hexley	0:281d6ff68967	1408	queue if it fires */
hexley	0:281d6ff68967	1409	pcb->rtime = -1;
hexley	0:281d6ff68967	1410
hexley	0:281d6ff68967	1411	tcp_segs_free(pcb->unsent);
hexley	0:281d6ff68967	1412	tcp_segs_free(pcb->unacked);
hexley	0:281d6ff68967	1413	pcb->unacked = pcb->unsent = NULL;
hexley	0:281d6ff68967	1414	#if TCP_OVERSIZE
hexley	0:281d6ff68967	1415	pcb->unsent_oversize = 0;
hexley	0:281d6ff68967	1416	#endif /* TCP_OVERSIZE */
hexley	0:281d6ff68967	1417	}
hexley	0:281d6ff68967	1418	}
hexley	0:281d6ff68967	1419
hexley	0:281d6ff68967	1420	/**
hexley	0:281d6ff68967	1421	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
hexley	0:281d6ff68967	1422	*
hexley	0:281d6ff68967	1423	* @param pcblist PCB list to purge.
hexley	0:281d6ff68967	1424	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
hexley	0:281d6ff68967	1425	*/
hexley	0:281d6ff68967	1426	void
hexley	0:281d6ff68967	1427	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
hexley	0:281d6ff68967	1428	{
hexley	0:281d6ff68967	1429	TCP_RMV(pcblist, pcb);
hexley	0:281d6ff68967	1430
hexley	0:281d6ff68967	1431	tcp_pcb_purge(pcb);
hexley	0:281d6ff68967	1432
hexley	0:281d6ff68967	1433	/* if there is an outstanding delayed ACKs, send it */
hexley	0:281d6ff68967	1434	if (pcb->state != TIME_WAIT &&
hexley	0:281d6ff68967	1435	pcb->state != LISTEN &&
hexley	0:281d6ff68967	1436	pcb->flags & TF_ACK_DELAY) {
hexley	0:281d6ff68967	1437	pcb->flags \|= TF_ACK_NOW;
hexley	0:281d6ff68967	1438	tcp_output(pcb);
hexley	0:281d6ff68967	1439	}
hexley	0:281d6ff68967	1440
hexley	0:281d6ff68967	1441	if (pcb->state != LISTEN) {
hexley	0:281d6ff68967	1442	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
hexley	0:281d6ff68967	1443	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
hexley	0:281d6ff68967	1444	#if TCP_QUEUE_OOSEQ
hexley	0:281d6ff68967	1445	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
hexley	0:281d6ff68967	1446	#endif /* TCP_QUEUE_OOSEQ */
hexley	0:281d6ff68967	1447	}
hexley	0:281d6ff68967	1448
hexley	0:281d6ff68967	1449	pcb->state = CLOSED;
hexley	0:281d6ff68967	1450
hexley	0:281d6ff68967	1451	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
hexley	0:281d6ff68967	1452	}
hexley	0:281d6ff68967	1453
hexley	0:281d6ff68967	1454	/**
hexley	0:281d6ff68967	1455	* Calculates a new initial sequence number for new connections.
hexley	0:281d6ff68967	1456	*
hexley	0:281d6ff68967	1457	* @return u32_t pseudo random sequence number
hexley	0:281d6ff68967	1458	*/
hexley	0:281d6ff68967	1459	u32_t
hexley	0:281d6ff68967	1460	tcp_next_iss(void)
hexley	0:281d6ff68967	1461	{
hexley	0:281d6ff68967	1462	static u32_t iss = 6510;
hexley	0:281d6ff68967	1463
hexley	0:281d6ff68967	1464	iss += tcp_ticks; /* XXX */
hexley	0:281d6ff68967	1465	return iss;
hexley	0:281d6ff68967	1466	}
hexley	0:281d6ff68967	1467
hexley	0:281d6ff68967	1468	#if TCP_CALCULATE_EFF_SEND_MSS
hexley	0:281d6ff68967	1469	/**
hexley	0:281d6ff68967	1470	* Calcluates the effective send mss that can be used for a specific IP address
hexley	0:281d6ff68967	1471	* by using ip_route to determin the netif used to send to the address and
hexley	0:281d6ff68967	1472	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
hexley	0:281d6ff68967	1473	*/
hexley	0:281d6ff68967	1474	u16_t
hexley	0:281d6ff68967	1475	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
hexley	0:281d6ff68967	1476	{
hexley	0:281d6ff68967	1477	u16_t mss_s;
hexley	0:281d6ff68967	1478	struct netif *outif;
hexley	0:281d6ff68967	1479
hexley	0:281d6ff68967	1480	outif = ip_route(addr);
hexley	0:281d6ff68967	1481	if ((outif != NULL) && (outif->mtu != 0)) {
hexley	0:281d6ff68967	1482	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
hexley	0:281d6ff68967	1483	/* RFC 1122, chap 4.2.2.6:
hexley	0:281d6ff68967	1484	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
hexley	0:281d6ff68967	1485	* We correct for TCP options in tcp_write(), and don't support IP options.
hexley	0:281d6ff68967	1486	*/
hexley	0:281d6ff68967	1487	sendmss = LWIP_MIN(sendmss, mss_s);
hexley	0:281d6ff68967	1488	}
hexley	0:281d6ff68967	1489	return sendmss;
hexley	0:281d6ff68967	1490	}
hexley	0:281d6ff68967	1491	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
hexley	0:281d6ff68967	1492
hexley	0:281d6ff68967	1493	const char*
hexley	0:281d6ff68967	1494	tcp_debug_state_str(enum tcp_state s)
hexley	0:281d6ff68967	1495	{
hexley	0:281d6ff68967	1496	return tcp_state_str[s];
hexley	0:281d6ff68967	1497	}
hexley	0:281d6ff68967	1498
hexley	0:281d6ff68967	1499	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
hexley	0:281d6ff68967	1500	/**
hexley	0:281d6ff68967	1501	* Print a tcp header for debugging purposes.
hexley	0:281d6ff68967	1502	*
hexley	0:281d6ff68967	1503	* @param tcphdr pointer to a struct tcp_hdr
hexley	0:281d6ff68967	1504	*/
hexley	0:281d6ff68967	1505	void
hexley	0:281d6ff68967	1506	tcp_debug_print(struct tcp_hdr *tcphdr)
hexley	0:281d6ff68967	1507	{
hexley	0:281d6ff68967	1508	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
hexley	0:281d6ff68967	1509	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
hexley	0:281d6ff68967	1510	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
hexley	0:281d6ff68967	1511	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
hexley	0:281d6ff68967	1512	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
hexley	0:281d6ff68967	1513	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
hexley	0:281d6ff68967	1514	ntohl(tcphdr->seqno)));
hexley	0:281d6ff68967	1515	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
hexley	0:281d6ff68967	1516	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
hexley	0:281d6ff68967	1517	ntohl(tcphdr->ackno)));
hexley	0:281d6ff68967	1518	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
hexley	0:281d6ff68967	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 (",
hexley	0:281d6ff68967	1520	TCPH_HDRLEN(tcphdr),
hexley	0:281d6ff68967	1521	TCPH_FLAGS(tcphdr) >> 5 & 1,
hexley	0:281d6ff68967	1522	TCPH_FLAGS(tcphdr) >> 4 & 1,
hexley	0:281d6ff68967	1523	TCPH_FLAGS(tcphdr) >> 3 & 1,
hexley	0:281d6ff68967	1524	TCPH_FLAGS(tcphdr) >> 2 & 1,
hexley	0:281d6ff68967	1525	TCPH_FLAGS(tcphdr) >> 1 & 1,
hexley	0:281d6ff68967	1526	TCPH_FLAGS(tcphdr) & 1,
hexley	0:281d6ff68967	1527	ntohs(tcphdr->wnd)));
hexley	0:281d6ff68967	1528	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
hexley	0:281d6ff68967	1529	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
hexley	0:281d6ff68967	1530	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
hexley	0:281d6ff68967	1531	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
hexley	0:281d6ff68967	1532	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
hexley	0:281d6ff68967	1533	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
hexley	0:281d6ff68967	1534	}
hexley	0:281d6ff68967	1535
hexley	0:281d6ff68967	1536	/**
hexley	0:281d6ff68967	1537	* Print a tcp state for debugging purposes.
hexley	0:281d6ff68967	1538	*
hexley	0:281d6ff68967	1539	* @param s enum tcp_state to print
hexley	0:281d6ff68967	1540	*/
hexley	0:281d6ff68967	1541	void
hexley	0:281d6ff68967	1542	tcp_debug_print_state(enum tcp_state s)
hexley	0:281d6ff68967	1543	{
hexley	0:281d6ff68967	1544	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
hexley	0:281d6ff68967	1545	}
hexley	0:281d6ff68967	1546
hexley	0:281d6ff68967	1547	/**
hexley	0:281d6ff68967	1548	* Print tcp flags for debugging purposes.
hexley	0:281d6ff68967	1549	*
hexley	0:281d6ff68967	1550	* @param flags tcp flags, all active flags are printed
hexley	0:281d6ff68967	1551	*/
hexley	0:281d6ff68967	1552	void
hexley	0:281d6ff68967	1553	tcp_debug_print_flags(u8_t flags)
hexley	0:281d6ff68967	1554	{
hexley	0:281d6ff68967	1555	if (flags & TCP_FIN) {
hexley	0:281d6ff68967	1556	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
hexley	0:281d6ff68967	1557	}
hexley	0:281d6ff68967	1558	if (flags & TCP_SYN) {
hexley	0:281d6ff68967	1559	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
hexley	0:281d6ff68967	1560	}
hexley	0:281d6ff68967	1561	if (flags & TCP_RST) {
hexley	0:281d6ff68967	1562	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
hexley	0:281d6ff68967	1563	}
hexley	0:281d6ff68967	1564	if (flags & TCP_PSH) {
hexley	0:281d6ff68967	1565	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
hexley	0:281d6ff68967	1566	}
hexley	0:281d6ff68967	1567	if (flags & TCP_ACK) {
hexley	0:281d6ff68967	1568	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
hexley	0:281d6ff68967	1569	}
hexley	0:281d6ff68967	1570	if (flags & TCP_URG) {
hexley	0:281d6ff68967	1571	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
hexley	0:281d6ff68967	1572	}
hexley	0:281d6ff68967	1573	if (flags & TCP_ECE) {
hexley	0:281d6ff68967	1574	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
hexley	0:281d6ff68967	1575	}
hexley	0:281d6ff68967	1576	if (flags & TCP_CWR) {
hexley	0:281d6ff68967	1577	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
hexley	0:281d6ff68967	1578	}
hexley	0:281d6ff68967	1579	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
hexley	0:281d6ff68967	1580	}
hexley	0:281d6ff68967	1581
hexley	0:281d6ff68967	1582	/**
hexley	0:281d6ff68967	1583	* Print all tcp_pcbs in every list for debugging purposes.
hexley	0:281d6ff68967	1584	*/
hexley	0:281d6ff68967	1585	void
hexley	0:281d6ff68967	1586	tcp_debug_print_pcbs(void)
hexley	0:281d6ff68967	1587	{
hexley	0:281d6ff68967	1588	struct tcp_pcb *pcb;
hexley	0:281d6ff68967	1589	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
hexley	0:281d6ff68967	1590	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
hexley	0:281d6ff68967	1591	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
hexley	0:281d6ff68967	1592	pcb->local_port, pcb->remote_port,
hexley	0:281d6ff68967	1593	pcb->snd_nxt, pcb->rcv_nxt));
hexley	0:281d6ff68967	1594	tcp_debug_print_state(pcb->state);
hexley	0:281d6ff68967	1595	}
hexley	0:281d6ff68967	1596	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
hexley	0:281d6ff68967	1597	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
hexley	0:281d6ff68967	1598	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
hexley	0:281d6ff68967	1599	pcb->local_port, pcb->remote_port,
hexley	0:281d6ff68967	1600	pcb->snd_nxt, pcb->rcv_nxt));
hexley	0:281d6ff68967	1601	tcp_debug_print_state(pcb->state);
hexley	0:281d6ff68967	1602	}
hexley	0:281d6ff68967	1603	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
hexley	0:281d6ff68967	1604	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
hexley	0:281d6ff68967	1605	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
hexley	0:281d6ff68967	1606	pcb->local_port, pcb->remote_port,
hexley	0:281d6ff68967	1607	pcb->snd_nxt, pcb->rcv_nxt));
hexley	0:281d6ff68967	1608	tcp_debug_print_state(pcb->state);
hexley	0:281d6ff68967	1609	}
hexley	0:281d6ff68967	1610	}
hexley	0:281d6ff68967	1611
hexley	0:281d6ff68967	1612	/**
hexley	0:281d6ff68967	1613	* Check state consistency of the tcp_pcb lists.
hexley	0:281d6ff68967	1614	*/
hexley	0:281d6ff68967	1615	s16_t
hexley	0:281d6ff68967	1616	tcp_pcbs_sane(void)
hexley	0:281d6ff68967	1617	{
hexley	0:281d6ff68967	1618	struct tcp_pcb *pcb;
hexley	0:281d6ff68967	1619	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
hexley	0:281d6ff68967	1620	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
hexley	0:281d6ff68967	1621	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
hexley	0:281d6ff68967	1622	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
hexley	0:281d6ff68967	1623	}
hexley	0:281d6ff68967	1624	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
hexley	0:281d6ff68967	1625	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
hexley	0:281d6ff68967	1626	}
hexley	0:281d6ff68967	1627	return 1;
hexley	0:281d6ff68967	1628	}
hexley	0:281d6ff68967	1629	#endif /* TCP_DEBUG */
hexley	0:281d6ff68967	1630
hexley	0:281d6ff68967	1631	#endif /* LWIP_TCP */

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Type:	Library
Created:	19 Nov 2010
Imports:	44
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

lwip/core/tcp.c@0:281d6ff68967, 2010-11-19 (annotated)

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