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Adam Green / Mbed 2 deprecated WeatherStation

Web server based weather station using Sparkfun Weather Meters.

Dependencies: FatFileSystem mbed WeatherMeters SDFileSystem

NetStack/lwip/core/tcp.c@1:c7958aa34fa1, 2012-02-25 (annotated)

Committer:: AdamGreen
Date:: Sat Feb 25 03:28:05 2012 +0000
Revision:: 1:c7958aa34fa1
Parent:: 0:616601bde9fb

Use published libraries where possible.

Who changed what in which revision?

User	Revision	Line number	New contents of line
AdamGreen	0:616601bde9fb	1	/**
AdamGreen	0:616601bde9fb	2	* @file
AdamGreen	0:616601bde9fb	3	* Transmission Control Protocol for IP
AdamGreen	0:616601bde9fb	4	*
AdamGreen	0:616601bde9fb	5	* This file contains common functions for the TCP implementation, such as functinos
AdamGreen	0:616601bde9fb	6	* for manipulating the data structures and the TCP timer functions. TCP functions
AdamGreen	0:616601bde9fb	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
AdamGreen	0:616601bde9fb	8	*
AdamGreen	0:616601bde9fb	9	*/
AdamGreen	0:616601bde9fb	10
AdamGreen	0:616601bde9fb	11	/*
AdamGreen	0:616601bde9fb	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AdamGreen	0:616601bde9fb	13	* All rights reserved.
AdamGreen	0:616601bde9fb	14	*
AdamGreen	0:616601bde9fb	15	* Redistribution and use in source and binary forms, with or without modification,
AdamGreen	0:616601bde9fb	16	* are permitted provided that the following conditions are met:
AdamGreen	0:616601bde9fb	17	*
AdamGreen	0:616601bde9fb	18	* 1. Redistributions of source code must retain the above copyright notice,
AdamGreen	0:616601bde9fb	19	* this list of conditions and the following disclaimer.
AdamGreen	0:616601bde9fb	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen	0:616601bde9fb	21	* this list of conditions and the following disclaimer in the documentation
AdamGreen	0:616601bde9fb	22	* and/or other materials provided with the distribution.
AdamGreen	0:616601bde9fb	23	* 3. The name of the author may not be used to endorse or promote products
AdamGreen	0:616601bde9fb	24	* derived from this software without specific prior written permission.
AdamGreen	0:616601bde9fb	25	*
AdamGreen	0:616601bde9fb	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen	0:616601bde9fb	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen	0:616601bde9fb	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen	0:616601bde9fb	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen	0:616601bde9fb	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen	0:616601bde9fb	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen	0:616601bde9fb	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen	0:616601bde9fb	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen	0:616601bde9fb	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen	0:616601bde9fb	35	* OF SUCH DAMAGE.
AdamGreen	0:616601bde9fb	36	*
AdamGreen	0:616601bde9fb	37	* This file is part of the lwIP TCP/IP stack.
AdamGreen	0:616601bde9fb	38	*
AdamGreen	0:616601bde9fb	39	* Author: Adam Dunkels <adam@sics.se>
AdamGreen	0:616601bde9fb	40	*
AdamGreen	0:616601bde9fb	41	*/
AdamGreen	0:616601bde9fb	42
AdamGreen	0:616601bde9fb	43	#include "lwip/opt.h"
AdamGreen	0:616601bde9fb	44
AdamGreen	0:616601bde9fb	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
AdamGreen	0:616601bde9fb	46
AdamGreen	0:616601bde9fb	47	#include "lwip/def.h"
AdamGreen	0:616601bde9fb	48	#include "lwip/mem.h"
AdamGreen	0:616601bde9fb	49	#include "lwip/memp.h"
AdamGreen	0:616601bde9fb	50	#include "lwip/snmp.h"
AdamGreen	0:616601bde9fb	51	#include "lwip/tcp.h"
AdamGreen	0:616601bde9fb	52	#include "lwip/tcp_impl.h"
AdamGreen	0:616601bde9fb	53	#include "lwip/debug.h"
AdamGreen	0:616601bde9fb	54	#include "lwip/stats.h"
AdamGreen	0:616601bde9fb	55
AdamGreen	0:616601bde9fb	56	#include <string.h>
AdamGreen	0:616601bde9fb	57
AdamGreen	0:616601bde9fb	58	const char * const tcp_state_str[] = {
AdamGreen	0:616601bde9fb	59	"CLOSED",
AdamGreen	0:616601bde9fb	60	"LISTEN",
AdamGreen	0:616601bde9fb	61	"SYN_SENT",
AdamGreen	0:616601bde9fb	62	"SYN_RCVD",
AdamGreen	0:616601bde9fb	63	"ESTABLISHED",
AdamGreen	0:616601bde9fb	64	"FIN_WAIT_1",
AdamGreen	0:616601bde9fb	65	"FIN_WAIT_2",
AdamGreen	0:616601bde9fb	66	"CLOSE_WAIT",
AdamGreen	0:616601bde9fb	67	"CLOSING",
AdamGreen	0:616601bde9fb	68	"LAST_ACK",
AdamGreen	0:616601bde9fb	69	"TIME_WAIT"
AdamGreen	0:616601bde9fb	70	};
AdamGreen	0:616601bde9fb	71
AdamGreen	0:616601bde9fb	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
AdamGreen	0:616601bde9fb	73	u32_t tcp_ticks;
AdamGreen	0:616601bde9fb	74	const u8_t tcp_backoff[13] =
AdamGreen	0:616601bde9fb	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
AdamGreen	0:616601bde9fb	76	/* Times per slowtmr hits */
AdamGreen	0:616601bde9fb	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
AdamGreen	0:616601bde9fb	78
AdamGreen	0:616601bde9fb	79	/* The TCP PCB lists. */
AdamGreen	0:616601bde9fb	80
AdamGreen	0:616601bde9fb	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
AdamGreen	0:616601bde9fb	82	struct tcp_pcb *tcp_bound_pcbs;
AdamGreen	0:616601bde9fb	83	/** List of all TCP PCBs in LISTEN state */
AdamGreen	0:616601bde9fb	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
AdamGreen	0:616601bde9fb	85	/** List of all TCP PCBs that are in a state in which
AdamGreen	0:616601bde9fb	86	* they accept or send data. */
AdamGreen	0:616601bde9fb	87	struct tcp_pcb *tcp_active_pcbs;
AdamGreen	0:616601bde9fb	88	/** List of all TCP PCBs in TIME-WAIT state */
AdamGreen	0:616601bde9fb	89	struct tcp_pcb *tcp_tw_pcbs;
AdamGreen	0:616601bde9fb	90
AdamGreen	0:616601bde9fb	91	#define NUM_TCP_PCB_LISTS 4
AdamGreen	0:616601bde9fb	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
AdamGreen	0:616601bde9fb	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
AdamGreen	0:616601bde9fb	94	struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
AdamGreen	0:616601bde9fb	95	&tcp_active_pcbs, &tcp_tw_pcbs};
AdamGreen	0:616601bde9fb	96
AdamGreen	0:616601bde9fb	97	/** Only used for temporary storage. */
AdamGreen	0:616601bde9fb	98	struct tcp_pcb *tcp_tmp_pcb;
AdamGreen	0:616601bde9fb	99
AdamGreen	0:616601bde9fb	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
AdamGreen	0:616601bde9fb	101	static u8_t tcp_timer;
AdamGreen	0:616601bde9fb	102	static u16_t tcp_new_port(void);
AdamGreen	0:616601bde9fb	103
AdamGreen	0:616601bde9fb	104	/**
AdamGreen	0:616601bde9fb	105	* Called periodically to dispatch TCP timers.
AdamGreen	0:616601bde9fb	106	*
AdamGreen	0:616601bde9fb	107	*/
AdamGreen	0:616601bde9fb	108	void
AdamGreen	0:616601bde9fb	109	tcp_tmr(void)
AdamGreen	0:616601bde9fb	110	{
AdamGreen	0:616601bde9fb	111	/* Call tcp_fasttmr() every 250 ms */
AdamGreen	0:616601bde9fb	112	tcp_fasttmr();
AdamGreen	0:616601bde9fb	113
AdamGreen	0:616601bde9fb	114	if (++tcp_timer & 1) {
AdamGreen	0:616601bde9fb	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
AdamGreen	0:616601bde9fb	116	tcp_tmr() is called. */
AdamGreen	0:616601bde9fb	117	tcp_slowtmr();
AdamGreen	0:616601bde9fb	118	}
AdamGreen	0:616601bde9fb	119	}
AdamGreen	0:616601bde9fb	120
AdamGreen	0:616601bde9fb	121	/**
AdamGreen	0:616601bde9fb	122	* Closes the TX side of a connection held by the PCB.
AdamGreen	0:616601bde9fb	123	* For tcp_close(), a RST is sent if the application didn't receive all data
AdamGreen	0:616601bde9fb	124	* (tcp_recved() not called for all data passed to recv callback).
AdamGreen	0:616601bde9fb	125	*
AdamGreen	0:616601bde9fb	126	* Listening pcbs are freed and may not be referenced any more.
AdamGreen	0:616601bde9fb	127	* Connection pcbs are freed if not yet connected and may not be referenced
AdamGreen	0:616601bde9fb	128	* any more. If a connection is established (at least SYN received or in
AdamGreen	0:616601bde9fb	129	* a closing state), the connection is closed, and put in a closing state.
AdamGreen	0:616601bde9fb	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
AdamGreen	0:616601bde9fb	131	* unsafe to reference it.
AdamGreen	0:616601bde9fb	132	*
AdamGreen	0:616601bde9fb	133	* @param pcb the tcp_pcb to close
AdamGreen	0:616601bde9fb	134	* @return ERR_OK if connection has been closed
AdamGreen	0:616601bde9fb	135	* another err_t if closing failed and pcb is not freed
AdamGreen	0:616601bde9fb	136	*/
AdamGreen	0:616601bde9fb	137	static err_t
AdamGreen	0:616601bde9fb	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
AdamGreen	0:616601bde9fb	139	{
AdamGreen	0:616601bde9fb	140	err_t err;
AdamGreen	0:616601bde9fb	141
AdamGreen	0:616601bde9fb	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
AdamGreen	0:616601bde9fb	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
AdamGreen	0:616601bde9fb	144	/* Not all data received by application, send RST to tell the remote
AdamGreen	0:616601bde9fb	145	side about this. */
AdamGreen	0:616601bde9fb	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
AdamGreen	0:616601bde9fb	147
AdamGreen	0:616601bde9fb	148	/* don't call tcp_abort here: we must not deallocate the pcb since
AdamGreen	0:616601bde9fb	149	that might not be expected when calling tcp_close */
AdamGreen	0:616601bde9fb	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
AdamGreen	0:616601bde9fb	151	pcb->local_port, pcb->remote_port);
AdamGreen	0:616601bde9fb	152
AdamGreen	0:616601bde9fb	153	tcp_pcb_purge(pcb);
AdamGreen	0:616601bde9fb	154
AdamGreen	0:616601bde9fb	155	/* TODO: to which state do we move now? */
AdamGreen	0:616601bde9fb	156
AdamGreen	0:616601bde9fb	157	/* move to TIME_WAIT since we close actively */
AdamGreen	0:616601bde9fb	158	TCP_RMV(&tcp_active_pcbs, pcb);
AdamGreen	0:616601bde9fb	159	pcb->state = TIME_WAIT;
AdamGreen	0:616601bde9fb	160	TCP_REG(&tcp_tw_pcbs, pcb);
AdamGreen	0:616601bde9fb	161
AdamGreen	0:616601bde9fb	162	return ERR_OK;
AdamGreen	0:616601bde9fb	163	}
AdamGreen	0:616601bde9fb	164	}
AdamGreen	0:616601bde9fb	165
AdamGreen	0:616601bde9fb	166	switch (pcb->state) {
AdamGreen	0:616601bde9fb	167	case CLOSED:
AdamGreen	0:616601bde9fb	168	/* Closing a pcb in the CLOSED state might seem erroneous,
AdamGreen	0:616601bde9fb	169	* however, it is in this state once allocated and as yet unused
AdamGreen	0:616601bde9fb	170	* and the user needs some way to free it should the need arise.
AdamGreen	0:616601bde9fb	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
AdamGreen	0:616601bde9fb	172	* or for a pcb that has been used and then entered the CLOSED state
AdamGreen	0:616601bde9fb	173	* is erroneous, but this should never happen as the pcb has in those cases
AdamGreen	0:616601bde9fb	174	* been freed, and so any remaining handles are bogus. */
AdamGreen	0:616601bde9fb	175	err = ERR_OK;
AdamGreen	0:616601bde9fb	176	TCP_RMV(&tcp_bound_pcbs, pcb);
AdamGreen	0:616601bde9fb	177	memp_free(MEMP_TCP_PCB, pcb);
AdamGreen	0:616601bde9fb	178	pcb = NULL;
AdamGreen	0:616601bde9fb	179	break;
AdamGreen	0:616601bde9fb	180	case LISTEN:
AdamGreen	0:616601bde9fb	181	err = ERR_OK;
AdamGreen	0:616601bde9fb	182	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
AdamGreen	0:616601bde9fb	183	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
AdamGreen	0:616601bde9fb	184	pcb = NULL;
AdamGreen	0:616601bde9fb	185	break;
AdamGreen	0:616601bde9fb	186	case SYN_SENT:
AdamGreen	0:616601bde9fb	187	err = ERR_OK;
AdamGreen	0:616601bde9fb	188	tcp_pcb_remove(&tcp_active_pcbs, pcb);
AdamGreen	0:616601bde9fb	189	memp_free(MEMP_TCP_PCB, pcb);
AdamGreen	0:616601bde9fb	190	pcb = NULL;
AdamGreen	0:616601bde9fb	191	snmp_inc_tcpattemptfails();
AdamGreen	0:616601bde9fb	192	break;
AdamGreen	0:616601bde9fb	193	case SYN_RCVD:
AdamGreen	0:616601bde9fb	194	err = tcp_send_fin(pcb);
AdamGreen	0:616601bde9fb	195	if (err == ERR_OK) {
AdamGreen	0:616601bde9fb	196	snmp_inc_tcpattemptfails();
AdamGreen	0:616601bde9fb	197	pcb->state = FIN_WAIT_1;
AdamGreen	0:616601bde9fb	198	}
AdamGreen	0:616601bde9fb	199	break;
AdamGreen	0:616601bde9fb	200	case ESTABLISHED:
AdamGreen	0:616601bde9fb	201	err = tcp_send_fin(pcb);
AdamGreen	0:616601bde9fb	202	if (err == ERR_OK) {
AdamGreen	0:616601bde9fb	203	snmp_inc_tcpestabresets();
AdamGreen	0:616601bde9fb	204	pcb->state = FIN_WAIT_1;
AdamGreen	0:616601bde9fb	205	}
AdamGreen	0:616601bde9fb	206	break;
AdamGreen	0:616601bde9fb	207	case CLOSE_WAIT:
AdamGreen	0:616601bde9fb	208	err = tcp_send_fin(pcb);
AdamGreen	0:616601bde9fb	209	if (err == ERR_OK) {
AdamGreen	0:616601bde9fb	210	snmp_inc_tcpestabresets();
AdamGreen	0:616601bde9fb	211	pcb->state = LAST_ACK;
AdamGreen	0:616601bde9fb	212	}
AdamGreen	0:616601bde9fb	213	break;
AdamGreen	0:616601bde9fb	214	default:
AdamGreen	0:616601bde9fb	215	/* Has already been closed, do nothing. */
AdamGreen	0:616601bde9fb	216	err = ERR_OK;
AdamGreen	0:616601bde9fb	217	pcb = NULL;
AdamGreen	0:616601bde9fb	218	break;
AdamGreen	0:616601bde9fb	219	}
AdamGreen	0:616601bde9fb	220
AdamGreen	0:616601bde9fb	221	if (pcb != NULL && err == ERR_OK) {
AdamGreen	0:616601bde9fb	222	/* To ensure all data has been sent when tcp_close returns, we have
AdamGreen	0:616601bde9fb	223	to make sure tcp_output doesn't fail.
AdamGreen	0:616601bde9fb	224	Since we don't really have to ensure all data has been sent when tcp_close
AdamGreen	0:616601bde9fb	225	returns (unsent data is sent from tcp timer functions, also), we don't care
AdamGreen	0:616601bde9fb	226	for the return value of tcp_output for now. */
AdamGreen	0:616601bde9fb	227	/* @todo: When implementing SO_LINGER, this must be changed somehow:
AdamGreen	0:616601bde9fb	228	If SOF_LINGER is set, the data should be sent and acked before close returns.
AdamGreen	0:616601bde9fb	229	This can only be valid for sequential APIs, not for the raw API. */
AdamGreen	0:616601bde9fb	230	tcp_output(pcb);
AdamGreen	0:616601bde9fb	231	}
AdamGreen	0:616601bde9fb	232	return err;
AdamGreen	0:616601bde9fb	233	}
AdamGreen	0:616601bde9fb	234
AdamGreen	0:616601bde9fb	235	/**
AdamGreen	0:616601bde9fb	236	* Closes the connection held by the PCB.
AdamGreen	0:616601bde9fb	237	*
AdamGreen	0:616601bde9fb	238	* Listening pcbs are freed and may not be referenced any more.
AdamGreen	0:616601bde9fb	239	* Connection pcbs are freed if not yet connected and may not be referenced
AdamGreen	0:616601bde9fb	240	* any more. If a connection is established (at least SYN received or in
AdamGreen	0:616601bde9fb	241	* a closing state), the connection is closed, and put in a closing state.
AdamGreen	0:616601bde9fb	242	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
AdamGreen	0:616601bde9fb	243	* unsafe to reference it (unless an error is returned).
AdamGreen	0:616601bde9fb	244	*
AdamGreen	0:616601bde9fb	245	* @param pcb the tcp_pcb to close
AdamGreen	0:616601bde9fb	246	* @return ERR_OK if connection has been closed
AdamGreen	0:616601bde9fb	247	* another err_t if closing failed and pcb is not freed
AdamGreen	0:616601bde9fb	248	*/
AdamGreen	0:616601bde9fb	249	err_t
AdamGreen	0:616601bde9fb	250	tcp_close(struct tcp_pcb *pcb)
AdamGreen	0:616601bde9fb	251	{
AdamGreen	0:616601bde9fb	252	#if TCP_DEBUG
AdamGreen	0:616601bde9fb	253	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
AdamGreen	0:616601bde9fb	254	tcp_debug_print_state(pcb->state);
AdamGreen	0:616601bde9fb	255	#endif /* TCP_DEBUG */
AdamGreen	0:616601bde9fb	256
AdamGreen	0:616601bde9fb	257	if (pcb->state != LISTEN) {
AdamGreen	0:616601bde9fb	258	/* Set a flag not to receive any more data... */
AdamGreen	0:616601bde9fb	259	pcb->flags \|= TF_RXCLOSED;
AdamGreen	0:616601bde9fb	260	}
AdamGreen	0:616601bde9fb	261	/* ... and close */
AdamGreen	0:616601bde9fb	262	return tcp_close_shutdown(pcb, 1);
AdamGreen	0:616601bde9fb	263	}
AdamGreen	0:616601bde9fb	264
AdamGreen	0:616601bde9fb	265	/**
AdamGreen	0:616601bde9fb	266	* Causes all or part of a full-duplex connection of this PCB to be shut down.
AdamGreen	0:616601bde9fb	267	* This doesn't deallocate the PCB!
AdamGreen	0:616601bde9fb	268	*
AdamGreen	0:616601bde9fb	269	* @param pcb PCB to shutdown
AdamGreen	0:616601bde9fb	270	* @param shut_rx shut down receive side if this is != 0
AdamGreen	0:616601bde9fb	271	* @param shut_tx shut down send side if this is != 0
AdamGreen	0:616601bde9fb	272	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
AdamGreen	0:616601bde9fb	273	* another err_t on error.
AdamGreen	0:616601bde9fb	274	*/
AdamGreen	0:616601bde9fb	275	err_t
AdamGreen	0:616601bde9fb	276	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
AdamGreen	0:616601bde9fb	277	{
AdamGreen	0:616601bde9fb	278	if (pcb->state == LISTEN) {
AdamGreen	0:616601bde9fb	279	return ERR_CONN;
AdamGreen	0:616601bde9fb	280	}
AdamGreen	0:616601bde9fb	281	if (shut_rx) {
AdamGreen	0:616601bde9fb	282	/* shut down the receive side: free buffered data... */
AdamGreen	0:616601bde9fb	283	if (pcb->refused_data != NULL) {
AdamGreen	0:616601bde9fb	284	pbuf_free(pcb->refused_data);
AdamGreen	0:616601bde9fb	285	pcb->refused_data = NULL;
AdamGreen	0:616601bde9fb	286	}
AdamGreen	0:616601bde9fb	287	/* ... and set a flag not to receive any more data */
AdamGreen	0:616601bde9fb	288	pcb->flags \|= TF_RXCLOSED;
AdamGreen	0:616601bde9fb	289	}
AdamGreen	0:616601bde9fb	290	if (shut_tx) {
AdamGreen	0:616601bde9fb	291	/* This can't happen twice since if it succeeds, the pcb's state is changed.
AdamGreen	0:616601bde9fb	292	Only close in these states as the others directly deallocate the PCB */
AdamGreen	0:616601bde9fb	293	switch (pcb->state) {
AdamGreen	0:616601bde9fb	294	case SYN_RCVD:
AdamGreen	0:616601bde9fb	295	case ESTABLISHED:
AdamGreen	0:616601bde9fb	296	case CLOSE_WAIT:
AdamGreen	0:616601bde9fb	297	return tcp_close_shutdown(pcb, 0);
AdamGreen	0:616601bde9fb	298	default:
AdamGreen	0:616601bde9fb	299	/* don't shut down other states */
AdamGreen	0:616601bde9fb	300	break;
AdamGreen	0:616601bde9fb	301	}
AdamGreen	0:616601bde9fb	302	}
AdamGreen	0:616601bde9fb	303	/* @todo: return another err_t if not in correct state or already shut? */
AdamGreen	0:616601bde9fb	304	return ERR_OK;
AdamGreen	0:616601bde9fb	305	}
AdamGreen	0:616601bde9fb	306
AdamGreen	0:616601bde9fb	307	/**
AdamGreen	0:616601bde9fb	308	* Abandons a connection and optionally sends a RST to the remote
AdamGreen	0:616601bde9fb	309	* host. Deletes the local protocol control block. This is done when
AdamGreen	0:616601bde9fb	310	* a connection is killed because of shortage of memory.
AdamGreen	0:616601bde9fb	311	*
AdamGreen	0:616601bde9fb	312	* @param pcb the tcp_pcb to abort
AdamGreen	0:616601bde9fb	313	* @param reset boolean to indicate whether a reset should be sent
AdamGreen	0:616601bde9fb	314	*/
AdamGreen	0:616601bde9fb	315	void
AdamGreen	0:616601bde9fb	316	tcp_abandon(struct tcp_pcb *pcb, int reset)
AdamGreen	0:616601bde9fb	317	{
AdamGreen	0:616601bde9fb	318	u32_t seqno, ackno;
AdamGreen	0:616601bde9fb	319	u16_t remote_port, local_port;
AdamGreen	0:616601bde9fb	320	ip_addr_t remote_ip, local_ip;
AdamGreen	0:616601bde9fb	321	#if LWIP_CALLBACK_API
AdamGreen	0:616601bde9fb	322	tcp_err_fn errf;
AdamGreen	0:616601bde9fb	323	#endif /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	324	void *errf_arg;
AdamGreen	0:616601bde9fb	325
AdamGreen	0:616601bde9fb	326	/* pcb->state LISTEN not allowed here */
AdamGreen	0:616601bde9fb	327	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
AdamGreen	0:616601bde9fb	328	pcb->state != LISTEN);
AdamGreen	0:616601bde9fb	329	/* Figure out on which TCP PCB list we are, and remove us. If we
AdamGreen	0:616601bde9fb	330	are in an active state, call the receive function associated with
AdamGreen	0:616601bde9fb	331	the PCB with a NULL argument, and send an RST to the remote end. */
AdamGreen	0:616601bde9fb	332	if (pcb->state == TIME_WAIT) {
AdamGreen	0:616601bde9fb	333	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
AdamGreen	0:616601bde9fb	334	memp_free(MEMP_TCP_PCB, pcb);
AdamGreen	0:616601bde9fb	335	} else {
AdamGreen	0:616601bde9fb	336	seqno = pcb->snd_nxt;
AdamGreen	0:616601bde9fb	337	ackno = pcb->rcv_nxt;
AdamGreen	0:616601bde9fb	338	ip_addr_copy(local_ip, pcb->local_ip);
AdamGreen	0:616601bde9fb	339	ip_addr_copy(remote_ip, pcb->remote_ip);
AdamGreen	0:616601bde9fb	340	local_port = pcb->local_port;
AdamGreen	0:616601bde9fb	341	remote_port = pcb->remote_port;
AdamGreen	0:616601bde9fb	342	#if LWIP_CALLBACK_API
AdamGreen	0:616601bde9fb	343	errf = pcb->errf;
AdamGreen	0:616601bde9fb	344	#endif /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	345	errf_arg = pcb->callback_arg;
AdamGreen	0:616601bde9fb	346	tcp_pcb_remove(&tcp_active_pcbs, pcb);
AdamGreen	0:616601bde9fb	347	if (pcb->unacked != NULL) {
AdamGreen	0:616601bde9fb	348	tcp_segs_free(pcb->unacked);
AdamGreen	0:616601bde9fb	349	}
AdamGreen	0:616601bde9fb	350	if (pcb->unsent != NULL) {
AdamGreen	0:616601bde9fb	351	tcp_segs_free(pcb->unsent);
AdamGreen	0:616601bde9fb	352	}
AdamGreen	0:616601bde9fb	353	#if TCP_QUEUE_OOSEQ
AdamGreen	0:616601bde9fb	354	if (pcb->ooseq != NULL) {
AdamGreen	0:616601bde9fb	355	tcp_segs_free(pcb->ooseq);
AdamGreen	0:616601bde9fb	356	}
AdamGreen	0:616601bde9fb	357	#endif /* TCP_QUEUE_OOSEQ */
AdamGreen	0:616601bde9fb	358	memp_free(MEMP_TCP_PCB, pcb);
AdamGreen	0:616601bde9fb	359	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
AdamGreen	0:616601bde9fb	360	if (reset) {
AdamGreen	0:616601bde9fb	361	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
AdamGreen	0:616601bde9fb	362	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
AdamGreen	0:616601bde9fb	363	}
AdamGreen	0:616601bde9fb	364	}
AdamGreen	0:616601bde9fb	365	}
AdamGreen	0:616601bde9fb	366
AdamGreen	0:616601bde9fb	367	/**
AdamGreen	0:616601bde9fb	368	* Aborts the connection by sending a RST (reset) segment to the remote
AdamGreen	0:616601bde9fb	369	* host. The pcb is deallocated. This function never fails.
AdamGreen	0:616601bde9fb	370	*
AdamGreen	0:616601bde9fb	371	* ATTENTION: When calling this from one of the TCP callbacks, make
AdamGreen	0:616601bde9fb	372	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
AdamGreen	0:616601bde9fb	373	* or you will risk accessing deallocated memory or memory leaks!
AdamGreen	0:616601bde9fb	374	*
AdamGreen	0:616601bde9fb	375	* @param pcb the tcp pcb to abort
AdamGreen	0:616601bde9fb	376	*/
AdamGreen	0:616601bde9fb	377	void
AdamGreen	0:616601bde9fb	378	tcp_abort(struct tcp_pcb *pcb)
AdamGreen	0:616601bde9fb	379	{
AdamGreen	0:616601bde9fb	380	tcp_abandon(pcb, 1);
AdamGreen	0:616601bde9fb	381	}
AdamGreen	0:616601bde9fb	382
AdamGreen	0:616601bde9fb	383	/**
AdamGreen	0:616601bde9fb	384	* Binds the connection to a local portnumber and IP address. If the
AdamGreen	0:616601bde9fb	385	* IP address is not given (i.e., ipaddr == NULL), the IP address of
AdamGreen	0:616601bde9fb	386	* the outgoing network interface is used instead.
AdamGreen	0:616601bde9fb	387	*
AdamGreen	0:616601bde9fb	388	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
AdamGreen	0:616601bde9fb	389	* already bound!)
AdamGreen	0:616601bde9fb	390	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
AdamGreen	0:616601bde9fb	391	* to any local address
AdamGreen	0:616601bde9fb	392	* @param port the local port to bind to
AdamGreen	0:616601bde9fb	393	* @return ERR_USE if the port is already in use
AdamGreen	0:616601bde9fb	394	* ERR_OK if bound
AdamGreen	0:616601bde9fb	395	*/
AdamGreen	0:616601bde9fb	396	err_t
AdamGreen	0:616601bde9fb	397	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
AdamGreen	0:616601bde9fb	398	{
AdamGreen	0:616601bde9fb	399	int i;
AdamGreen	0:616601bde9fb	400	int max_pcb_list = NUM_TCP_PCB_LISTS;
AdamGreen	0:616601bde9fb	401	struct tcp_pcb *cpcb;
AdamGreen	0:616601bde9fb	402
AdamGreen	0:616601bde9fb	403	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
AdamGreen	0:616601bde9fb	404
AdamGreen	0:616601bde9fb	405	#if SO_REUSE
AdamGreen	0:616601bde9fb	406	/* Unless the REUSEADDR flag is set,
AdamGreen	0:616601bde9fb	407	we have to check the pcbs in TIME-WAIT state, also.
AdamGreen	0:616601bde9fb	408	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
AdamGreen	0:616601bde9fb	409	packets using both local and remote IP addresses and ports to distinguish.
AdamGreen	0:616601bde9fb	410	*/
AdamGreen	0:616601bde9fb	411	#if SO_REUSE
AdamGreen	0:616601bde9fb	412	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
AdamGreen	0:616601bde9fb	413	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
AdamGreen	0:616601bde9fb	414	}
AdamGreen	0:616601bde9fb	415	#endif /* SO_REUSE */
AdamGreen	0:616601bde9fb	416	#endif /* SO_REUSE */
AdamGreen	0:616601bde9fb	417
AdamGreen	0:616601bde9fb	418	if (port == 0) {
AdamGreen	0:616601bde9fb	419	port = tcp_new_port();
AdamGreen	0:616601bde9fb	420	}
AdamGreen	0:616601bde9fb	421
AdamGreen	0:616601bde9fb	422	/* Check if the address already is in use (on all lists) */
AdamGreen	0:616601bde9fb	423	for (i = 0; i < max_pcb_list; i++) {
AdamGreen	0:616601bde9fb	424	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
AdamGreen	0:616601bde9fb	425	if (cpcb->local_port == port) {
AdamGreen	0:616601bde9fb	426	#if SO_REUSE
AdamGreen	0:616601bde9fb	427	/* Omit checking for the same port if both pcbs have REUSEADDR set.
AdamGreen	0:616601bde9fb	428	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
AdamGreen	0:616601bde9fb	429	tcp_connect. */
AdamGreen	0:616601bde9fb	430	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
AdamGreen	0:616601bde9fb	431	((cpcb->so_options & SOF_REUSEADDR) == 0))
AdamGreen	0:616601bde9fb	432	#endif /* SO_REUSE */
AdamGreen	0:616601bde9fb	433	{
AdamGreen	0:616601bde9fb	434	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
AdamGreen	0:616601bde9fb	435	ip_addr_isany(ipaddr) \|\|
AdamGreen	0:616601bde9fb	436	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
AdamGreen	0:616601bde9fb	437	return ERR_USE;
AdamGreen	0:616601bde9fb	438	}
AdamGreen	0:616601bde9fb	439	}
AdamGreen	0:616601bde9fb	440	}
AdamGreen	0:616601bde9fb	441	}
AdamGreen	0:616601bde9fb	442	}
AdamGreen	0:616601bde9fb	443
AdamGreen	0:616601bde9fb	444	if (!ip_addr_isany(ipaddr)) {
AdamGreen	0:616601bde9fb	445	pcb->local_ip = *ipaddr;
AdamGreen	0:616601bde9fb	446	}
AdamGreen	0:616601bde9fb	447	pcb->local_port = port;
AdamGreen	0:616601bde9fb	448	TCP_REG(&tcp_bound_pcbs, pcb);
AdamGreen	0:616601bde9fb	449	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
AdamGreen	0:616601bde9fb	450	return ERR_OK;
AdamGreen	0:616601bde9fb	451	}
AdamGreen	0:616601bde9fb	452	#if LWIP_CALLBACK_API
AdamGreen	0:616601bde9fb	453	/**
AdamGreen	0:616601bde9fb	454	* Default accept callback if no accept callback is specified by the user.
AdamGreen	0:616601bde9fb	455	*/
AdamGreen	0:616601bde9fb	456	static err_t
AdamGreen	0:616601bde9fb	457	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
AdamGreen	0:616601bde9fb	458	{
AdamGreen	0:616601bde9fb	459	LWIP_UNUSED_ARG(arg);
AdamGreen	0:616601bde9fb	460	LWIP_UNUSED_ARG(pcb);
AdamGreen	0:616601bde9fb	461	LWIP_UNUSED_ARG(err);
AdamGreen	0:616601bde9fb	462
AdamGreen	0:616601bde9fb	463	return ERR_ABRT;
AdamGreen	0:616601bde9fb	464	}
AdamGreen	0:616601bde9fb	465	#endif /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	466
AdamGreen	0:616601bde9fb	467	/**
AdamGreen	0:616601bde9fb	468	* Set the state of the connection to be LISTEN, which means that it
AdamGreen	0:616601bde9fb	469	* is able to accept incoming connections. The protocol control block
AdamGreen	0:616601bde9fb	470	* is reallocated in order to consume less memory. Setting the
AdamGreen	0:616601bde9fb	471	* connection to LISTEN is an irreversible process.
AdamGreen	0:616601bde9fb	472	*
AdamGreen	0:616601bde9fb	473	* @param pcb the original tcp_pcb
AdamGreen	0:616601bde9fb	474	* @param backlog the incoming connections queue limit
AdamGreen	0:616601bde9fb	475	* @return tcp_pcb used for listening, consumes less memory.
AdamGreen	0:616601bde9fb	476	*
AdamGreen	0:616601bde9fb	477	* @note The original tcp_pcb is freed. This function therefore has to be
AdamGreen	0:616601bde9fb	478	* called like this:
AdamGreen	0:616601bde9fb	479	* tpcb = tcp_listen(tpcb);
AdamGreen	0:616601bde9fb	480	*/
AdamGreen	0:616601bde9fb	481	struct tcp_pcb *
AdamGreen	0:616601bde9fb	482	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
AdamGreen	0:616601bde9fb	483	{
AdamGreen	0:616601bde9fb	484	struct tcp_pcb_listen *lpcb;
AdamGreen	0:616601bde9fb	485
AdamGreen	0:616601bde9fb	486	LWIP_UNUSED_ARG(backlog);
AdamGreen	0:616601bde9fb	487	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
AdamGreen	0:616601bde9fb	488
AdamGreen	0:616601bde9fb	489	/* already listening? */
AdamGreen	0:616601bde9fb	490	if (pcb->state == LISTEN) {
AdamGreen	0:616601bde9fb	491	return pcb;
AdamGreen	0:616601bde9fb	492	}
AdamGreen	0:616601bde9fb	493	#if SO_REUSE
AdamGreen	0:616601bde9fb	494	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
AdamGreen	0:616601bde9fb	495	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
AdamGreen	0:616601bde9fb	496	is declared (listen-/connection-pcb), we have to make sure now that
AdamGreen	0:616601bde9fb	497	this port is only used once for every local IP. */
AdamGreen	0:616601bde9fb	498	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
AdamGreen	0:616601bde9fb	499	if (lpcb->local_port == pcb->local_port) {
AdamGreen	0:616601bde9fb	500	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
AdamGreen	0:616601bde9fb	501	/* this address/port is already used */
AdamGreen	0:616601bde9fb	502	return NULL;
AdamGreen	0:616601bde9fb	503	}
AdamGreen	0:616601bde9fb	504	}
AdamGreen	0:616601bde9fb	505	}
AdamGreen	0:616601bde9fb	506	}
AdamGreen	0:616601bde9fb	507	#endif /* SO_REUSE */
AdamGreen	0:616601bde9fb	508	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
AdamGreen	0:616601bde9fb	509	if (lpcb == NULL) {
AdamGreen	0:616601bde9fb	510	return NULL;
AdamGreen	0:616601bde9fb	511	}
AdamGreen	0:616601bde9fb	512	lpcb->callback_arg = pcb->callback_arg;
AdamGreen	0:616601bde9fb	513	lpcb->local_port = pcb->local_port;
AdamGreen	0:616601bde9fb	514	lpcb->state = LISTEN;
AdamGreen	0:616601bde9fb	515	lpcb->prio = pcb->prio;
AdamGreen	0:616601bde9fb	516	lpcb->so_options = pcb->so_options;
AdamGreen	0:616601bde9fb	517	lpcb->so_options \|= SOF_ACCEPTCONN;
AdamGreen	0:616601bde9fb	518	lpcb->ttl = pcb->ttl;
AdamGreen	0:616601bde9fb	519	lpcb->tos = pcb->tos;
AdamGreen	0:616601bde9fb	520	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
AdamGreen	0:616601bde9fb	521	TCP_RMV(&tcp_bound_pcbs, pcb);
AdamGreen	0:616601bde9fb	522	memp_free(MEMP_TCP_PCB, pcb);
AdamGreen	0:616601bde9fb	523	#if LWIP_CALLBACK_API
AdamGreen	0:616601bde9fb	524	lpcb->accept = tcp_accept_null;
AdamGreen	0:616601bde9fb	525	#endif /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	526	#if TCP_LISTEN_BACKLOG
AdamGreen	0:616601bde9fb	527	lpcb->accepts_pending = 0;
AdamGreen	0:616601bde9fb	528	lpcb->backlog = (backlog ? backlog : 1);
AdamGreen	0:616601bde9fb	529	#endif /* TCP_LISTEN_BACKLOG */
AdamGreen	0:616601bde9fb	530	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
AdamGreen	0:616601bde9fb	531	return (struct tcp_pcb *)lpcb;
AdamGreen	0:616601bde9fb	532	}
AdamGreen	0:616601bde9fb	533
AdamGreen	0:616601bde9fb	534	/**
AdamGreen	0:616601bde9fb	535	* Update the state that tracks the available window space to advertise.
AdamGreen	0:616601bde9fb	536	*
AdamGreen	0:616601bde9fb	537	* Returns how much extra window would be advertised if we sent an
AdamGreen	0:616601bde9fb	538	* update now.
AdamGreen	0:616601bde9fb	539	*/
AdamGreen	0:616601bde9fb	540	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
AdamGreen	0:616601bde9fb	541	{
AdamGreen	0:616601bde9fb	542	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
AdamGreen	0:616601bde9fb	543
AdamGreen	0:616601bde9fb	544	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
AdamGreen	0:616601bde9fb	545	/* we can advertise more window */
AdamGreen	0:616601bde9fb	546	pcb->rcv_ann_wnd = pcb->rcv_wnd;
AdamGreen	0:616601bde9fb	547	return new_right_edge - pcb->rcv_ann_right_edge;
AdamGreen	0:616601bde9fb	548	} else {
AdamGreen	0:616601bde9fb	549	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
AdamGreen	0:616601bde9fb	550	/* Can happen due to other end sending out of advertised window,
AdamGreen	0:616601bde9fb	551	* but within actual available (but not yet advertised) window */
AdamGreen	0:616601bde9fb	552	pcb->rcv_ann_wnd = 0;
AdamGreen	0:616601bde9fb	553	} else {
AdamGreen	0:616601bde9fb	554	/* keep the right edge of window constant */
AdamGreen	0:616601bde9fb	555	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
AdamGreen	0:616601bde9fb	556	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
AdamGreen	0:616601bde9fb	557	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
AdamGreen	0:616601bde9fb	558	}
AdamGreen	0:616601bde9fb	559	return 0;
AdamGreen	0:616601bde9fb	560	}
AdamGreen	0:616601bde9fb	561	}
AdamGreen	0:616601bde9fb	562
AdamGreen	0:616601bde9fb	563	/**
AdamGreen	0:616601bde9fb	564	* This function should be called by the application when it has
AdamGreen	0:616601bde9fb	565	* processed the data. The purpose is to advertise a larger window
AdamGreen	0:616601bde9fb	566	* when the data has been processed.
AdamGreen	0:616601bde9fb	567	*
AdamGreen	0:616601bde9fb	568	* @param pcb the tcp_pcb for which data is read
AdamGreen	0:616601bde9fb	569	* @param len the amount of bytes that have been read by the application
AdamGreen	0:616601bde9fb	570	*/
AdamGreen	0:616601bde9fb	571	void
AdamGreen	0:616601bde9fb	572	tcp_recved(struct tcp_pcb *pcb, u16_t len)
AdamGreen	0:616601bde9fb	573	{
AdamGreen	0:616601bde9fb	574	int wnd_inflation;
AdamGreen	0:616601bde9fb	575
AdamGreen	0:616601bde9fb	576	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
AdamGreen	0:616601bde9fb	577	len <= 0xffff - pcb->rcv_wnd );
AdamGreen	0:616601bde9fb	578
AdamGreen	0:616601bde9fb	579	pcb->rcv_wnd += len;
AdamGreen	0:616601bde9fb	580	if (pcb->rcv_wnd > TCP_WND) {
AdamGreen	0:616601bde9fb	581	pcb->rcv_wnd = TCP_WND;
AdamGreen	0:616601bde9fb	582	}
AdamGreen	0:616601bde9fb	583
AdamGreen	0:616601bde9fb	584	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
AdamGreen	0:616601bde9fb	585
AdamGreen	0:616601bde9fb	586	/* If the change in the right edge of window is significant (default
AdamGreen	0:616601bde9fb	587	* watermark is TCP_WND/4), then send an explicit update now.
AdamGreen	0:616601bde9fb	588	* Otherwise wait for a packet to be sent in the normal course of
AdamGreen	0:616601bde9fb	589	* events (or more window to be available later) */
AdamGreen	0:616601bde9fb	590	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
AdamGreen	0:616601bde9fb	591	tcp_ack_now(pcb);
AdamGreen	0:616601bde9fb	592	tcp_output(pcb);
AdamGreen	0:616601bde9fb	593	}
AdamGreen	0:616601bde9fb	594
AdamGreen	0:616601bde9fb	595	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
AdamGreen	0:616601bde9fb	596	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
AdamGreen	0:616601bde9fb	597	}
AdamGreen	0:616601bde9fb	598
AdamGreen	0:616601bde9fb	599	/**
AdamGreen	0:616601bde9fb	600	* A nastly hack featuring 'goto' statements that allocates a
AdamGreen	0:616601bde9fb	601	* new TCP local port.
AdamGreen	0:616601bde9fb	602	*
AdamGreen	0:616601bde9fb	603	* @return a new (free) local TCP port number
AdamGreen	0:616601bde9fb	604	*/
AdamGreen	0:616601bde9fb	605	static u16_t
AdamGreen	0:616601bde9fb	606	tcp_new_port(void)
AdamGreen	0:616601bde9fb	607	{
AdamGreen	0:616601bde9fb	608	int i;
AdamGreen	0:616601bde9fb	609	struct tcp_pcb *pcb;
AdamGreen	0:616601bde9fb	610	#ifndef TCP_LOCAL_PORT_RANGE_START
AdamGreen	0:616601bde9fb	611	#define TCP_LOCAL_PORT_RANGE_START 4096
AdamGreen	0:616601bde9fb	612	#define TCP_LOCAL_PORT_RANGE_END 0x7fff
AdamGreen	0:616601bde9fb	613	#endif
AdamGreen	0:616601bde9fb	614	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
AdamGreen	0:616601bde9fb	615
AdamGreen	0:616601bde9fb	616	again:
AdamGreen	0:616601bde9fb	617	if (++port > TCP_LOCAL_PORT_RANGE_END) {
AdamGreen	0:616601bde9fb	618	port = TCP_LOCAL_PORT_RANGE_START;
AdamGreen	0:616601bde9fb	619	}
AdamGreen	0:616601bde9fb	620	/* Check all PCB lists. */
AdamGreen	0:616601bde9fb	621	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
AdamGreen	0:616601bde9fb	622	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
AdamGreen	0:616601bde9fb	623	if (pcb->local_port == port) {
AdamGreen	0:616601bde9fb	624	goto again;
AdamGreen	0:616601bde9fb	625	}
AdamGreen	0:616601bde9fb	626	}
AdamGreen	0:616601bde9fb	627	}
AdamGreen	0:616601bde9fb	628	return port;
AdamGreen	0:616601bde9fb	629	}
AdamGreen	0:616601bde9fb	630
AdamGreen	0:616601bde9fb	631	/**
AdamGreen	0:616601bde9fb	632	* Connects to another host. The function given as the "connected"
AdamGreen	0:616601bde9fb	633	* argument will be called when the connection has been established.
AdamGreen	0:616601bde9fb	634	*
AdamGreen	0:616601bde9fb	635	* @param pcb the tcp_pcb used to establish the connection
AdamGreen	0:616601bde9fb	636	* @param ipaddr the remote ip address to connect to
AdamGreen	0:616601bde9fb	637	* @param port the remote tcp port to connect to
AdamGreen	0:616601bde9fb	638	* @param connected callback function to call when connected (or on error)
AdamGreen	0:616601bde9fb	639	* @return ERR_VAL if invalid arguments are given
AdamGreen	0:616601bde9fb	640	* ERR_OK if connect request has been sent
AdamGreen	0:616601bde9fb	641	* other err_t values if connect request couldn't be sent
AdamGreen	0:616601bde9fb	642	*/
AdamGreen	0:616601bde9fb	643	err_t
AdamGreen	0:616601bde9fb	644	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
AdamGreen	0:616601bde9fb	645	tcp_connected_fn connected)
AdamGreen	0:616601bde9fb	646	{
AdamGreen	0:616601bde9fb	647	err_t ret;
AdamGreen	0:616601bde9fb	648	u32_t iss;
AdamGreen	0:616601bde9fb	649
AdamGreen	0:616601bde9fb	650	LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
AdamGreen	0:616601bde9fb	651
AdamGreen	0:616601bde9fb	652	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
AdamGreen	0:616601bde9fb	653	if (ipaddr != NULL) {
AdamGreen	0:616601bde9fb	654	pcb->remote_ip = *ipaddr;
AdamGreen	0:616601bde9fb	655	} else {
AdamGreen	0:616601bde9fb	656	return ERR_VAL;
AdamGreen	0:616601bde9fb	657	}
AdamGreen	0:616601bde9fb	658	pcb->remote_port = port;
AdamGreen	0:616601bde9fb	659
AdamGreen	0:616601bde9fb	660	/* check if we have a route to the remote host */
AdamGreen	0:616601bde9fb	661	if (ip_addr_isany(&(pcb->local_ip))) {
AdamGreen	0:616601bde9fb	662	/* no local IP address set, yet. */
AdamGreen	0:616601bde9fb	663	struct netif *netif = ip_route(&(pcb->remote_ip));
AdamGreen	0:616601bde9fb	664	if (netif == NULL) {
AdamGreen	0:616601bde9fb	665	/* Don't even try to send a SYN packet if we have no route
AdamGreen	0:616601bde9fb	666	since that will fail. */
AdamGreen	0:616601bde9fb	667	return ERR_RTE;
AdamGreen	0:616601bde9fb	668	}
AdamGreen	0:616601bde9fb	669	/* Use the netif's IP address as local address. */
AdamGreen	0:616601bde9fb	670	ip_addr_copy(pcb->local_ip, netif->ip_addr);
AdamGreen	0:616601bde9fb	671	}
AdamGreen	0:616601bde9fb	672
AdamGreen	0:616601bde9fb	673	if (pcb->local_port == 0) {
AdamGreen	0:616601bde9fb	674	pcb->local_port = tcp_new_port();
AdamGreen	0:616601bde9fb	675	}
AdamGreen	0:616601bde9fb	676	#if SO_REUSE
AdamGreen	0:616601bde9fb	677	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
AdamGreen	0:616601bde9fb	678	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
AdamGreen	0:616601bde9fb	679	now that the 5-tuple is unique. */
AdamGreen	0:616601bde9fb	680	struct tcp_pcb *cpcb;
AdamGreen	0:616601bde9fb	681	int i;
AdamGreen	0:616601bde9fb	682	/* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
AdamGreen	0:616601bde9fb	683	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
AdamGreen	0:616601bde9fb	684	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
AdamGreen	0:616601bde9fb	685	if ((cpcb->local_port == pcb->local_port) &&
AdamGreen	0:616601bde9fb	686	(cpcb->remote_port == port) &&
AdamGreen	0:616601bde9fb	687	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
AdamGreen	0:616601bde9fb	688	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
AdamGreen	0:616601bde9fb	689	/* linux returns EISCONN here, but ERR_USE should be OK for us */
AdamGreen	0:616601bde9fb	690	return ERR_USE;
AdamGreen	0:616601bde9fb	691	}
AdamGreen	0:616601bde9fb	692	}
AdamGreen	0:616601bde9fb	693	}
AdamGreen	0:616601bde9fb	694	}
AdamGreen	0:616601bde9fb	695	#endif /* SO_REUSE */
AdamGreen	0:616601bde9fb	696	iss = tcp_next_iss();
AdamGreen	0:616601bde9fb	697	pcb->rcv_nxt = 0;
AdamGreen	0:616601bde9fb	698	pcb->snd_nxt = iss;
AdamGreen	0:616601bde9fb	699	pcb->lastack = iss - 1;
AdamGreen	0:616601bde9fb	700	pcb->snd_lbb = iss - 1;
AdamGreen	0:616601bde9fb	701	pcb->rcv_wnd = TCP_WND;
AdamGreen	0:616601bde9fb	702	pcb->rcv_ann_wnd = TCP_WND;
AdamGreen	0:616601bde9fb	703	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
AdamGreen	0:616601bde9fb	704	pcb->snd_wnd = TCP_WND;
AdamGreen	0:616601bde9fb	705	/* As initial send MSS, we use TCP_MSS but limit it to 536.
AdamGreen	0:616601bde9fb	706	The send MSS is updated when an MSS option is received. */
AdamGreen	0:616601bde9fb	707	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
AdamGreen	0:616601bde9fb	708	#if TCP_CALCULATE_EFF_SEND_MSS
AdamGreen	0:616601bde9fb	709	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
AdamGreen	0:616601bde9fb	710	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
AdamGreen	0:616601bde9fb	711	pcb->cwnd = 1;
AdamGreen	0:616601bde9fb	712	pcb->ssthresh = pcb->mss * 10;
AdamGreen	0:616601bde9fb	713	#if LWIP_CALLBACK_API
AdamGreen	0:616601bde9fb	714	pcb->connected = connected;
AdamGreen	0:616601bde9fb	715	#else /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	716	LWIP_UNUSED_ARG(connected);
AdamGreen	0:616601bde9fb	717	#endif /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	718
AdamGreen	0:616601bde9fb	719	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
AdamGreen	0:616601bde9fb	720
AdamGreen	0:616601bde9fb	721	/* Send a SYN together with the MSS option. */
AdamGreen	0:616601bde9fb	722	ret = tcp_enqueue_flags(pcb, TCP_SYN);
AdamGreen	0:616601bde9fb	723	if (ret == ERR_OK) {
AdamGreen	0:616601bde9fb	724	/* SYN segment was enqueued, changed the pcbs state now */
AdamGreen	0:616601bde9fb	725	pcb->state = SYN_SENT;
AdamGreen	0:616601bde9fb	726	TCP_RMV(&tcp_bound_pcbs, pcb);
AdamGreen	0:616601bde9fb	727	TCP_REG(&tcp_active_pcbs, pcb);
AdamGreen	0:616601bde9fb	728	snmp_inc_tcpactiveopens();
AdamGreen	0:616601bde9fb	729
AdamGreen	0:616601bde9fb	730	tcp_output(pcb);
AdamGreen	0:616601bde9fb	731	}
AdamGreen	0:616601bde9fb	732	return ret;
AdamGreen	0:616601bde9fb	733	}
AdamGreen	0:616601bde9fb	734
AdamGreen	0:616601bde9fb	735	/**
AdamGreen	0:616601bde9fb	736	* Called every 500 ms and implements the retransmission timer and the timer that
AdamGreen	0:616601bde9fb	737	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
AdamGreen	0:616601bde9fb	738	* various timers such as the inactivity timer in each PCB.
AdamGreen	0:616601bde9fb	739	*
AdamGreen	0:616601bde9fb	740	* Automatically called from tcp_tmr().
AdamGreen	0:616601bde9fb	741	*/
AdamGreen	0:616601bde9fb	742	void
AdamGreen	0:616601bde9fb	743	tcp_slowtmr(void)
AdamGreen	0:616601bde9fb	744	{
AdamGreen	0:616601bde9fb	745	struct tcp_pcb pcb, pcb2, *prev;
AdamGreen	0:616601bde9fb	746	u16_t eff_wnd;
AdamGreen	0:616601bde9fb	747	u8_t pcb_remove; /* flag if a PCB should be removed */
AdamGreen	0:616601bde9fb	748	u8_t pcb_reset; /* flag if a RST should be sent when removing */
AdamGreen	0:616601bde9fb	749	err_t err;
AdamGreen	0:616601bde9fb	750
AdamGreen	0:616601bde9fb	751	tcp_debug_print_pcbs(); //DG
AdamGreen	0:616601bde9fb	752
AdamGreen	0:616601bde9fb	753	err = ERR_OK;
AdamGreen	0:616601bde9fb	754
AdamGreen	0:616601bde9fb	755	++tcp_ticks;
AdamGreen	0:616601bde9fb	756	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
AdamGreen	0:616601bde9fb	757
AdamGreen	0:616601bde9fb	758	/* Steps through all of the active PCBs. */
AdamGreen	0:616601bde9fb	759	prev = NULL;
AdamGreen	0:616601bde9fb	760	pcb = tcp_active_pcbs;
AdamGreen	0:616601bde9fb	761	if (pcb == NULL) {
AdamGreen	0:616601bde9fb	762	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
AdamGreen	0:616601bde9fb	763	}
AdamGreen	0:616601bde9fb	764	while (pcb != NULL) {
AdamGreen	0:616601bde9fb	765	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
AdamGreen	0:616601bde9fb	766	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
AdamGreen	0:616601bde9fb	767	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
AdamGreen	0:616601bde9fb	768	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
AdamGreen	0:616601bde9fb	769
AdamGreen	0:616601bde9fb	770	pcb_remove = 0;
AdamGreen	0:616601bde9fb	771	pcb_reset = 0;
AdamGreen	0:616601bde9fb	772
AdamGreen	0:616601bde9fb	773	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
AdamGreen	0:616601bde9fb	774	++pcb_remove;
AdamGreen	0:616601bde9fb	775	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
AdamGreen	0:616601bde9fb	776	}
AdamGreen	0:616601bde9fb	777	else if (pcb->nrtx == TCP_MAXRTX) {
AdamGreen	0:616601bde9fb	778	++pcb_remove;
AdamGreen	0:616601bde9fb	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
AdamGreen	0:616601bde9fb	780	} else {
AdamGreen	0:616601bde9fb	781	if (pcb->persist_backoff > 0) {
AdamGreen	0:616601bde9fb	782	/* If snd_wnd is zero, use persist timer to send 1 byte probes
AdamGreen	0:616601bde9fb	783	* instead of using the standard retransmission mechanism. */
AdamGreen	0:616601bde9fb	784	pcb->persist_cnt++;
AdamGreen	0:616601bde9fb	785	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
AdamGreen	0:616601bde9fb	786	pcb->persist_cnt = 0;
AdamGreen	0:616601bde9fb	787	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
AdamGreen	0:616601bde9fb	788	pcb->persist_backoff++;
AdamGreen	0:616601bde9fb	789	}
AdamGreen	0:616601bde9fb	790	tcp_zero_window_probe(pcb);
AdamGreen	0:616601bde9fb	791	}
AdamGreen	0:616601bde9fb	792	} else {
AdamGreen	0:616601bde9fb	793	/* Increase the retransmission timer if it is running */
AdamGreen	0:616601bde9fb	794	if(pcb->rtime >= 0)
AdamGreen	0:616601bde9fb	795	++pcb->rtime;
AdamGreen	0:616601bde9fb	796
AdamGreen	0:616601bde9fb	797	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
AdamGreen	0:616601bde9fb	798	/* Time for a retransmission. */
AdamGreen	0:616601bde9fb	799	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
AdamGreen	0:616601bde9fb	800	" pcb->rto %"S16_F"\n",
AdamGreen	0:616601bde9fb	801	pcb->rtime, pcb->rto));
AdamGreen	0:616601bde9fb	802
AdamGreen	0:616601bde9fb	803	/* Double retransmission time-out unless we are trying to
AdamGreen	0:616601bde9fb	804	* connect to somebody (i.e., we are in SYN_SENT). */
AdamGreen	0:616601bde9fb	805	if (pcb->state != SYN_SENT) {
AdamGreen	0:616601bde9fb	806	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
AdamGreen	0:616601bde9fb	807	}
AdamGreen	0:616601bde9fb	808
AdamGreen	0:616601bde9fb	809	/* Reset the retransmission timer. */
AdamGreen	0:616601bde9fb	810	pcb->rtime = 0;
AdamGreen	0:616601bde9fb	811
AdamGreen	0:616601bde9fb	812	/* Reduce congestion window and ssthresh. */
AdamGreen	0:616601bde9fb	813	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
AdamGreen	0:616601bde9fb	814	pcb->ssthresh = eff_wnd >> 1;
AdamGreen	0:616601bde9fb	815	if (pcb->ssthresh < (pcb->mss << 1)) {
AdamGreen	0:616601bde9fb	816	pcb->ssthresh = (pcb->mss << 1);
AdamGreen	0:616601bde9fb	817	}
AdamGreen	0:616601bde9fb	818	pcb->cwnd = pcb->mss;
AdamGreen	0:616601bde9fb	819	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
AdamGreen	0:616601bde9fb	820	" ssthresh %"U16_F"\n",
AdamGreen	0:616601bde9fb	821	pcb->cwnd, pcb->ssthresh));
AdamGreen	0:616601bde9fb	822
AdamGreen	0:616601bde9fb	823	/* The following needs to be called AFTER cwnd is set to one
AdamGreen	0:616601bde9fb	824	mss - STJ */
AdamGreen	0:616601bde9fb	825	tcp_rexmit_rto(pcb);
AdamGreen	0:616601bde9fb	826	}
AdamGreen	0:616601bde9fb	827	}
AdamGreen	0:616601bde9fb	828	}
AdamGreen	0:616601bde9fb	829	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
AdamGreen	0:616601bde9fb	830	if (pcb->state == FIN_WAIT_2) {
AdamGreen	0:616601bde9fb	831	if ((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen	0:616601bde9fb	832	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
AdamGreen	0:616601bde9fb	833	++pcb_remove;
AdamGreen	0:616601bde9fb	834	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
AdamGreen	0:616601bde9fb	835	}
AdamGreen	0:616601bde9fb	836	}
AdamGreen	0:616601bde9fb	837
AdamGreen	0:616601bde9fb	838	/* Check if KEEPALIVE should be sent */
AdamGreen	0:616601bde9fb	839	if((pcb->so_options & SOF_KEEPALIVE) &&
AdamGreen	0:616601bde9fb	840	((pcb->state == ESTABLISHED) \|\|
AdamGreen	0:616601bde9fb	841	(pcb->state == CLOSE_WAIT))) {
AdamGreen	0:616601bde9fb	842	#if LWIP_TCP_KEEPALIVE
AdamGreen	0:616601bde9fb	843	if((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen	0:616601bde9fb	844	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
AdamGreen	0:616601bde9fb	845	/ TCP_SLOW_INTERVAL)
AdamGreen	0:616601bde9fb	846	#else
AdamGreen	0:616601bde9fb	847	if((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen	0:616601bde9fb	848	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
AdamGreen	0:616601bde9fb	849	#endif /* LWIP_TCP_KEEPALIVE */
AdamGreen	0:616601bde9fb	850	{
AdamGreen	0:616601bde9fb	851	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
AdamGreen	0:616601bde9fb	852	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
AdamGreen	0:616601bde9fb	853	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
AdamGreen	0:616601bde9fb	854
AdamGreen	0:616601bde9fb	855	++pcb_remove;
AdamGreen	0:616601bde9fb	856	++pcb_reset;
AdamGreen	0:616601bde9fb	857	}
AdamGreen	0:616601bde9fb	858	#if LWIP_TCP_KEEPALIVE
AdamGreen	0:616601bde9fb	859	else if((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen	0:616601bde9fb	860	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
AdamGreen	0:616601bde9fb	861	/ TCP_SLOW_INTERVAL)
AdamGreen	0:616601bde9fb	862	#else
AdamGreen	0:616601bde9fb	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen	0:616601bde9fb	864	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
AdamGreen	0:616601bde9fb	865	/ TCP_SLOW_INTERVAL)
AdamGreen	0:616601bde9fb	866	#endif /* LWIP_TCP_KEEPALIVE */
AdamGreen	0:616601bde9fb	867	{
AdamGreen	0:616601bde9fb	868	tcp_keepalive(pcb);
AdamGreen	0:616601bde9fb	869	pcb->keep_cnt_sent++;
AdamGreen	0:616601bde9fb	870	}
AdamGreen	0:616601bde9fb	871	}
AdamGreen	0:616601bde9fb	872
AdamGreen	0:616601bde9fb	873	/* If this PCB has queued out of sequence data, but has been
AdamGreen	0:616601bde9fb	874	inactive for too long, will drop the data (it will eventually
AdamGreen	0:616601bde9fb	875	be retransmitted). */
AdamGreen	0:616601bde9fb	876	#if TCP_QUEUE_OOSEQ
AdamGreen	0:616601bde9fb	877	if (pcb->ooseq != NULL &&
AdamGreen	0:616601bde9fb	878	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
AdamGreen	0:616601bde9fb	879	tcp_segs_free(pcb->ooseq);
AdamGreen	0:616601bde9fb	880	pcb->ooseq = NULL;
AdamGreen	0:616601bde9fb	881	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
AdamGreen	0:616601bde9fb	882	}
AdamGreen	0:616601bde9fb	883	#endif /* TCP_QUEUE_OOSEQ */
AdamGreen	0:616601bde9fb	884
AdamGreen	0:616601bde9fb	885	/* Check if this PCB has stayed too long in SYN-RCVD */
AdamGreen	0:616601bde9fb	886	if (pcb->state == SYN_RCVD) {
AdamGreen	0:616601bde9fb	887	if ((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen	0:616601bde9fb	888	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
AdamGreen	0:616601bde9fb	889	++pcb_remove;
AdamGreen	0:616601bde9fb	890	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
AdamGreen	0:616601bde9fb	891	}
AdamGreen	0:616601bde9fb	892	}
AdamGreen	0:616601bde9fb	893
AdamGreen	0:616601bde9fb	894	/* Check if this PCB has stayed too long in LAST-ACK */
AdamGreen	0:616601bde9fb	895	if (pcb->state == LAST_ACK) {
AdamGreen	0:616601bde9fb	896	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
AdamGreen	0:616601bde9fb	897	++pcb_remove;
AdamGreen	0:616601bde9fb	898	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
AdamGreen	0:616601bde9fb	899	}
AdamGreen	0:616601bde9fb	900	}
AdamGreen	0:616601bde9fb	901
AdamGreen	0:616601bde9fb	902	/* If the PCB should be removed, do it. */
AdamGreen	0:616601bde9fb	903	if (pcb_remove) {
AdamGreen	0:616601bde9fb	904	tcp_pcb_purge(pcb);
AdamGreen	0:616601bde9fb	905	/* Remove PCB from tcp_active_pcbs list. */
AdamGreen	0:616601bde9fb	906	if (prev != NULL) {
AdamGreen	0:616601bde9fb	907	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
AdamGreen	0:616601bde9fb	908	prev->next = pcb->next;
AdamGreen	0:616601bde9fb	909	} else {
AdamGreen	0:616601bde9fb	910	/* This PCB was the first. */
AdamGreen	0:616601bde9fb	911	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
AdamGreen	0:616601bde9fb	912	tcp_active_pcbs = pcb->next;
AdamGreen	0:616601bde9fb	913	}
AdamGreen	0:616601bde9fb	914
AdamGreen	0:616601bde9fb	915	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
AdamGreen	0:616601bde9fb	916	if (pcb_reset) {
AdamGreen	0:616601bde9fb	917	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
AdamGreen	0:616601bde9fb	918	pcb->local_port, pcb->remote_port);
AdamGreen	0:616601bde9fb	919	}
AdamGreen	0:616601bde9fb	920
AdamGreen	0:616601bde9fb	921	pcb2 = pcb->next;
AdamGreen	0:616601bde9fb	922	memp_free(MEMP_TCP_PCB, pcb);
AdamGreen	0:616601bde9fb	923	pcb = pcb2;
AdamGreen	0:616601bde9fb	924	} else {
AdamGreen	0:616601bde9fb	925	/* get the 'next' element now and work with 'prev' below (in case of abort) */
AdamGreen	0:616601bde9fb	926	prev = pcb;
AdamGreen	0:616601bde9fb	927	pcb = pcb->next;
AdamGreen	0:616601bde9fb	928
AdamGreen	0:616601bde9fb	929	/* We check if we should poll the connection. */
AdamGreen	0:616601bde9fb	930	++prev->polltmr;
AdamGreen	0:616601bde9fb	931	if (prev->polltmr >= prev->pollinterval) {
AdamGreen	0:616601bde9fb	932	prev->polltmr = 0;
AdamGreen	0:616601bde9fb	933	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
AdamGreen	0:616601bde9fb	934	TCP_EVENT_POLL(prev, err);
AdamGreen	0:616601bde9fb	935	/* if err == ERR_ABRT, 'prev' is already deallocated */
AdamGreen	0:616601bde9fb	936	if (err == ERR_OK) {
AdamGreen	0:616601bde9fb	937	tcp_output(prev);
AdamGreen	0:616601bde9fb	938	}
AdamGreen	0:616601bde9fb	939	}
AdamGreen	0:616601bde9fb	940	}
AdamGreen	0:616601bde9fb	941	}
AdamGreen	0:616601bde9fb	942
AdamGreen	0:616601bde9fb	943
AdamGreen	0:616601bde9fb	944	/* Steps through all of the TIME-WAIT PCBs. */
AdamGreen	0:616601bde9fb	945	prev = NULL;
AdamGreen	0:616601bde9fb	946	pcb = tcp_tw_pcbs;
AdamGreen	0:616601bde9fb	947	while (pcb != NULL) {
AdamGreen	0:616601bde9fb	948	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
AdamGreen	0:616601bde9fb	949	pcb_remove = 0;
AdamGreen	0:616601bde9fb	950
AdamGreen	0:616601bde9fb	951	/* Check if this PCB has stayed long enough in TIME-WAIT */
AdamGreen	0:616601bde9fb	952	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
AdamGreen	0:616601bde9fb	953	++pcb_remove;
AdamGreen	0:616601bde9fb	954	}
AdamGreen	0:616601bde9fb	955
AdamGreen	0:616601bde9fb	956
AdamGreen	0:616601bde9fb	957
AdamGreen	0:616601bde9fb	958	/* If the PCB should be removed, do it. */
AdamGreen	0:616601bde9fb	959	if (pcb_remove) {
AdamGreen	0:616601bde9fb	960	tcp_pcb_purge(pcb);
AdamGreen	0:616601bde9fb	961	/* Remove PCB from tcp_tw_pcbs list. */
AdamGreen	0:616601bde9fb	962	if (prev != NULL) {
AdamGreen	0:616601bde9fb	963	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
AdamGreen	0:616601bde9fb	964	prev->next = pcb->next;
AdamGreen	0:616601bde9fb	965	} else {
AdamGreen	0:616601bde9fb	966	/* This PCB was the first. */
AdamGreen	0:616601bde9fb	967	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
AdamGreen	0:616601bde9fb	968	tcp_tw_pcbs = pcb->next;
AdamGreen	0:616601bde9fb	969	}
AdamGreen	0:616601bde9fb	970	pcb2 = pcb->next;
AdamGreen	0:616601bde9fb	971	memp_free(MEMP_TCP_PCB, pcb);
AdamGreen	0:616601bde9fb	972	pcb = pcb2;
AdamGreen	0:616601bde9fb	973	} else {
AdamGreen	0:616601bde9fb	974	prev = pcb;
AdamGreen	0:616601bde9fb	975	pcb = pcb->next;
AdamGreen	0:616601bde9fb	976	}
AdamGreen	0:616601bde9fb	977	}
AdamGreen	0:616601bde9fb	978	}
AdamGreen	0:616601bde9fb	979
AdamGreen	0:616601bde9fb	980	/**
AdamGreen	0:616601bde9fb	981	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
AdamGreen	0:616601bde9fb	982	* "refused" by upper layer (application) and sends delayed ACKs.
AdamGreen	0:616601bde9fb	983	*
AdamGreen	0:616601bde9fb	984	* Automatically called from tcp_tmr().
AdamGreen	0:616601bde9fb	985	*/
AdamGreen	0:616601bde9fb	986	void
AdamGreen	0:616601bde9fb	987	tcp_fasttmr(void)
AdamGreen	0:616601bde9fb	988	{
AdamGreen	0:616601bde9fb	989	struct tcp_pcb *pcb = tcp_active_pcbs;
AdamGreen	0:616601bde9fb	990
AdamGreen	0:616601bde9fb	991	while(pcb != NULL) {
AdamGreen	0:616601bde9fb	992	struct tcp_pcb *next = pcb->next;
AdamGreen	0:616601bde9fb	993	/* If there is data which was previously "refused" by upper layer */
AdamGreen	0:616601bde9fb	994	if (pcb->refused_data != NULL) {
AdamGreen	0:616601bde9fb	995	/* Notify again application with data previously received. */
AdamGreen	0:616601bde9fb	996	err_t err;
AdamGreen	0:616601bde9fb	997	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
AdamGreen	0:616601bde9fb	998	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
AdamGreen	0:616601bde9fb	999	if (err == ERR_OK) {
AdamGreen	0:616601bde9fb	1000	pcb->refused_data = NULL;
AdamGreen	0:616601bde9fb	1001	} else if (err == ERR_ABRT) {
AdamGreen	0:616601bde9fb	1002	/* if err == ERR_ABRT, 'pcb' is already deallocated */
AdamGreen	0:616601bde9fb	1003	pcb = NULL;
AdamGreen	0:616601bde9fb	1004	}
AdamGreen	0:616601bde9fb	1005	}
AdamGreen	0:616601bde9fb	1006
AdamGreen	0:616601bde9fb	1007	/* send delayed ACKs */
AdamGreen	0:616601bde9fb	1008	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
AdamGreen	0:616601bde9fb	1009	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
AdamGreen	0:616601bde9fb	1010	tcp_ack_now(pcb);
AdamGreen	0:616601bde9fb	1011	tcp_output(pcb);
AdamGreen	0:616601bde9fb	1012	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
AdamGreen	0:616601bde9fb	1013	}
AdamGreen	0:616601bde9fb	1014
AdamGreen	0:616601bde9fb	1015	pcb = next;
AdamGreen	0:616601bde9fb	1016	}
AdamGreen	0:616601bde9fb	1017	}
AdamGreen	0:616601bde9fb	1018
AdamGreen	0:616601bde9fb	1019	/**
AdamGreen	0:616601bde9fb	1020	* Deallocates a list of TCP segments (tcp_seg structures).
AdamGreen	0:616601bde9fb	1021	*
AdamGreen	0:616601bde9fb	1022	* @param seg tcp_seg list of TCP segments to free
AdamGreen	0:616601bde9fb	1023	*/
AdamGreen	0:616601bde9fb	1024	void
AdamGreen	0:616601bde9fb	1025	tcp_segs_free(struct tcp_seg *seg)
AdamGreen	0:616601bde9fb	1026	{
AdamGreen	0:616601bde9fb	1027	while (seg != NULL) {
AdamGreen	0:616601bde9fb	1028	struct tcp_seg *next = seg->next;
AdamGreen	0:616601bde9fb	1029	tcp_seg_free(seg);
AdamGreen	0:616601bde9fb	1030	seg = next;
AdamGreen	0:616601bde9fb	1031	}
AdamGreen	0:616601bde9fb	1032	}
AdamGreen	0:616601bde9fb	1033
AdamGreen	0:616601bde9fb	1034	/**
AdamGreen	0:616601bde9fb	1035	* Frees a TCP segment (tcp_seg structure).
AdamGreen	0:616601bde9fb	1036	*
AdamGreen	0:616601bde9fb	1037	* @param seg single tcp_seg to free
AdamGreen	0:616601bde9fb	1038	*/
AdamGreen	0:616601bde9fb	1039	void
AdamGreen	0:616601bde9fb	1040	tcp_seg_free(struct tcp_seg *seg)
AdamGreen	0:616601bde9fb	1041	{
AdamGreen	0:616601bde9fb	1042	if (seg != NULL) {
AdamGreen	0:616601bde9fb	1043	if (seg->p != NULL) {
AdamGreen	0:616601bde9fb	1044	pbuf_free(seg->p);
AdamGreen	0:616601bde9fb	1045	#if TCP_DEBUG
AdamGreen	0:616601bde9fb	1046	seg->p = NULL;
AdamGreen	0:616601bde9fb	1047	#endif /* TCP_DEBUG */
AdamGreen	0:616601bde9fb	1048	}
AdamGreen	0:616601bde9fb	1049	memp_free(MEMP_TCP_SEG, seg);
AdamGreen	0:616601bde9fb	1050	}
AdamGreen	0:616601bde9fb	1051	}
AdamGreen	0:616601bde9fb	1052
AdamGreen	0:616601bde9fb	1053	/**
AdamGreen	0:616601bde9fb	1054	* Sets the priority of a connection.
AdamGreen	0:616601bde9fb	1055	*
AdamGreen	0:616601bde9fb	1056	* @param pcb the tcp_pcb to manipulate
AdamGreen	0:616601bde9fb	1057	* @param prio new priority
AdamGreen	0:616601bde9fb	1058	*/
AdamGreen	0:616601bde9fb	1059	void
AdamGreen	0:616601bde9fb	1060	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
AdamGreen	0:616601bde9fb	1061	{
AdamGreen	0:616601bde9fb	1062	pcb->prio = prio;
AdamGreen	0:616601bde9fb	1063	}
AdamGreen	0:616601bde9fb	1064
AdamGreen	0:616601bde9fb	1065	#if TCP_QUEUE_OOSEQ
AdamGreen	0:616601bde9fb	1066	/**
AdamGreen	0:616601bde9fb	1067	* Returns a copy of the given TCP segment.
AdamGreen	0:616601bde9fb	1068	* The pbuf and data are not copied, only the pointers
AdamGreen	0:616601bde9fb	1069	*
AdamGreen	0:616601bde9fb	1070	* @param seg the old tcp_seg
AdamGreen	0:616601bde9fb	1071	* @return a copy of seg
AdamGreen	0:616601bde9fb	1072	*/
AdamGreen	0:616601bde9fb	1073	struct tcp_seg *
AdamGreen	0:616601bde9fb	1074	tcp_seg_copy(struct tcp_seg *seg)
AdamGreen	0:616601bde9fb	1075	{
AdamGreen	0:616601bde9fb	1076	struct tcp_seg *cseg;
AdamGreen	0:616601bde9fb	1077
AdamGreen	0:616601bde9fb	1078	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
AdamGreen	0:616601bde9fb	1079	if (cseg == NULL) {
AdamGreen	0:616601bde9fb	1080	return NULL;
AdamGreen	0:616601bde9fb	1081	}
AdamGreen	0:616601bde9fb	1082	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
AdamGreen	0:616601bde9fb	1083	pbuf_ref(cseg->p);
AdamGreen	0:616601bde9fb	1084	return cseg;
AdamGreen	0:616601bde9fb	1085	}
AdamGreen	0:616601bde9fb	1086	#endif /* TCP_QUEUE_OOSEQ */
AdamGreen	0:616601bde9fb	1087
AdamGreen	0:616601bde9fb	1088	#if LWIP_CALLBACK_API
AdamGreen	0:616601bde9fb	1089	/**
AdamGreen	0:616601bde9fb	1090	* Default receive callback that is called if the user didn't register
AdamGreen	0:616601bde9fb	1091	* a recv callback for the pcb.
AdamGreen	0:616601bde9fb	1092	*/
AdamGreen	0:616601bde9fb	1093	err_t
AdamGreen	0:616601bde9fb	1094	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
AdamGreen	0:616601bde9fb	1095	{
AdamGreen	0:616601bde9fb	1096	LWIP_UNUSED_ARG(arg);
AdamGreen	0:616601bde9fb	1097	if (p != NULL) {
AdamGreen	0:616601bde9fb	1098	tcp_recved(pcb, p->tot_len);
AdamGreen	0:616601bde9fb	1099	pbuf_free(p);
AdamGreen	0:616601bde9fb	1100	} else if (err == ERR_OK) {
AdamGreen	0:616601bde9fb	1101	return tcp_close(pcb);
AdamGreen	0:616601bde9fb	1102	}
AdamGreen	0:616601bde9fb	1103	return ERR_OK;
AdamGreen	0:616601bde9fb	1104	}
AdamGreen	0:616601bde9fb	1105	#endif /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	1106
AdamGreen	0:616601bde9fb	1107	/**
AdamGreen	0:616601bde9fb	1108	* Kills the oldest active connection that has lower priority than prio.
AdamGreen	0:616601bde9fb	1109	*
AdamGreen	0:616601bde9fb	1110	* @param prio minimum priority
AdamGreen	0:616601bde9fb	1111	*/
AdamGreen	0:616601bde9fb	1112	static void
AdamGreen	0:616601bde9fb	1113	tcp_kill_prio(u8_t prio)
AdamGreen	0:616601bde9fb	1114	{
AdamGreen	0:616601bde9fb	1115	struct tcp_pcb pcb, inactive;
AdamGreen	0:616601bde9fb	1116	u32_t inactivity;
AdamGreen	0:616601bde9fb	1117	u8_t mprio;
AdamGreen	0:616601bde9fb	1118
AdamGreen	0:616601bde9fb	1119
AdamGreen	0:616601bde9fb	1120	mprio = TCP_PRIO_MAX;
AdamGreen	0:616601bde9fb	1121
AdamGreen	0:616601bde9fb	1122	/* We kill the oldest active connection that has lower priority than prio. */
AdamGreen	0:616601bde9fb	1123	inactivity = 0;
AdamGreen	0:616601bde9fb	1124	inactive = NULL;
AdamGreen	0:616601bde9fb	1125	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen	0:616601bde9fb	1126	if (pcb->prio < prio &&
AdamGreen	0:616601bde9fb	1127	pcb->prio <= mprio &&
AdamGreen	0:616601bde9fb	1128	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
AdamGreen	0:616601bde9fb	1129	inactivity = tcp_ticks - pcb->tmr;
AdamGreen	0:616601bde9fb	1130	inactive = pcb;
AdamGreen	0:616601bde9fb	1131	mprio = pcb->prio;
AdamGreen	0:616601bde9fb	1132	}
AdamGreen	0:616601bde9fb	1133	}
AdamGreen	0:616601bde9fb	1134	if (inactive != NULL) {
AdamGreen	0:616601bde9fb	1135	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
AdamGreen	0:616601bde9fb	1136	(void *)inactive, inactivity));
AdamGreen	0:616601bde9fb	1137	tcp_abort(inactive);
AdamGreen	0:616601bde9fb	1138	}
AdamGreen	0:616601bde9fb	1139	}
AdamGreen	0:616601bde9fb	1140
AdamGreen	0:616601bde9fb	1141	/**
AdamGreen	0:616601bde9fb	1142	* Kills the oldest connection that is in TIME_WAIT state.
AdamGreen	0:616601bde9fb	1143	* Called from tcp_alloc() if no more connections are available.
AdamGreen	0:616601bde9fb	1144	*/
AdamGreen	0:616601bde9fb	1145	static void
AdamGreen	0:616601bde9fb	1146	tcp_kill_timewait(void)
AdamGreen	0:616601bde9fb	1147	{
AdamGreen	0:616601bde9fb	1148	struct tcp_pcb pcb, inactive;
AdamGreen	0:616601bde9fb	1149	u32_t inactivity;
AdamGreen	0:616601bde9fb	1150
AdamGreen	0:616601bde9fb	1151	inactivity = 0;
AdamGreen	0:616601bde9fb	1152	inactive = NULL;
AdamGreen	0:616601bde9fb	1153	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
AdamGreen	0:616601bde9fb	1154	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen	0:616601bde9fb	1155	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
AdamGreen	0:616601bde9fb	1156	inactivity = tcp_ticks - pcb->tmr;
AdamGreen	0:616601bde9fb	1157	inactive = pcb;
AdamGreen	0:616601bde9fb	1158	}
AdamGreen	0:616601bde9fb	1159	}
AdamGreen	0:616601bde9fb	1160	if (inactive != NULL) {
AdamGreen	0:616601bde9fb	1161	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
AdamGreen	0:616601bde9fb	1162	(void *)inactive, inactivity));
AdamGreen	0:616601bde9fb	1163	tcp_abort(inactive);
AdamGreen	0:616601bde9fb	1164	}
AdamGreen	0:616601bde9fb	1165	}
AdamGreen	0:616601bde9fb	1166
AdamGreen	0:616601bde9fb	1167	/**
AdamGreen	0:616601bde9fb	1168	* Allocate a new tcp_pcb structure.
AdamGreen	0:616601bde9fb	1169	*
AdamGreen	0:616601bde9fb	1170	* @param prio priority for the new pcb
AdamGreen	0:616601bde9fb	1171	* @return a new tcp_pcb that initially is in state CLOSED
AdamGreen	0:616601bde9fb	1172	*/
AdamGreen	0:616601bde9fb	1173	struct tcp_pcb *
AdamGreen	0:616601bde9fb	1174	tcp_alloc(u8_t prio)
AdamGreen	0:616601bde9fb	1175	{
AdamGreen	0:616601bde9fb	1176	struct tcp_pcb *pcb;
AdamGreen	0:616601bde9fb	1177	u32_t iss;
AdamGreen	0:616601bde9fb	1178
AdamGreen	0:616601bde9fb	1179	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
AdamGreen	0:616601bde9fb	1180	if (pcb == NULL) {
AdamGreen	0:616601bde9fb	1181	/* Try killing oldest connection in TIME-WAIT. */
AdamGreen	0:616601bde9fb	1182	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
AdamGreen	0:616601bde9fb	1183	tcp_kill_timewait();
AdamGreen	0:616601bde9fb	1184	/* Try to allocate a tcp_pcb again. */
AdamGreen	0:616601bde9fb	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
AdamGreen	0:616601bde9fb	1186	if (pcb == NULL) {
AdamGreen	0:616601bde9fb	1187	/* Try killing active connections with lower priority than the new one. */
AdamGreen	0:616601bde9fb	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
AdamGreen	0:616601bde9fb	1189	tcp_kill_prio(prio);
AdamGreen	0:616601bde9fb	1190	/* Try to allocate a tcp_pcb again. */
AdamGreen	0:616601bde9fb	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
AdamGreen	0:616601bde9fb	1192	if (pcb != NULL) {
AdamGreen	0:616601bde9fb	1193	/* adjust err stats: memp_malloc failed twice before */
AdamGreen	0:616601bde9fb	1194	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
AdamGreen	0:616601bde9fb	1195	}
AdamGreen	0:616601bde9fb	1196	}
AdamGreen	0:616601bde9fb	1197	if (pcb != NULL) {
AdamGreen	0:616601bde9fb	1198	/* adjust err stats: timewait PCB was freed above */
AdamGreen	0:616601bde9fb	1199	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
AdamGreen	0:616601bde9fb	1200	}
AdamGreen	0:616601bde9fb	1201	}
AdamGreen	0:616601bde9fb	1202	if (pcb != NULL) {
AdamGreen	0:616601bde9fb	1203	memset(pcb, 0, sizeof(struct tcp_pcb));
AdamGreen	0:616601bde9fb	1204	pcb->prio = prio;
AdamGreen	0:616601bde9fb	1205	pcb->snd_buf = TCP_SND_BUF;
AdamGreen	0:616601bde9fb	1206	pcb->snd_queuelen = 0;
AdamGreen	0:616601bde9fb	1207	pcb->rcv_wnd = TCP_WND;
AdamGreen	0:616601bde9fb	1208	pcb->rcv_ann_wnd = TCP_WND;
AdamGreen	0:616601bde9fb	1209	pcb->tos = 0;
AdamGreen	0:616601bde9fb	1210	pcb->ttl = TCP_TTL;
AdamGreen	0:616601bde9fb	1211	/* As initial send MSS, we use TCP_MSS but limit it to 536.
AdamGreen	0:616601bde9fb	1212	The send MSS is updated when an MSS option is received. */
AdamGreen	0:616601bde9fb	1213	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
AdamGreen	0:616601bde9fb	1214	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
AdamGreen	0:616601bde9fb	1215	pcb->sa = 0;
AdamGreen	0:616601bde9fb	1216	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
AdamGreen	0:616601bde9fb	1217	pcb->rtime = -1;
AdamGreen	0:616601bde9fb	1218	pcb->cwnd = 1;
AdamGreen	0:616601bde9fb	1219	iss = tcp_next_iss();
AdamGreen	0:616601bde9fb	1220	pcb->snd_wl2 = iss;
AdamGreen	0:616601bde9fb	1221	pcb->snd_nxt = iss;
AdamGreen	0:616601bde9fb	1222	pcb->lastack = iss;
AdamGreen	0:616601bde9fb	1223	pcb->snd_lbb = iss;
AdamGreen	0:616601bde9fb	1224	pcb->tmr = tcp_ticks;
AdamGreen	0:616601bde9fb	1225
AdamGreen	0:616601bde9fb	1226	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
AdamGreen	0:616601bde9fb	1227
AdamGreen	0:616601bde9fb	1228	pcb->polltmr = 0;
AdamGreen	0:616601bde9fb	1229
AdamGreen	0:616601bde9fb	1230	#if LWIP_CALLBACK_API
AdamGreen	0:616601bde9fb	1231	pcb->recv = tcp_recv_null;
AdamGreen	0:616601bde9fb	1232	#endif /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	1233
AdamGreen	0:616601bde9fb	1234	/* Init KEEPALIVE timer */
AdamGreen	0:616601bde9fb	1235	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
AdamGreen	0:616601bde9fb	1236
AdamGreen	0:616601bde9fb	1237	#if LWIP_TCP_KEEPALIVE
AdamGreen	0:616601bde9fb	1238	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
AdamGreen	0:616601bde9fb	1239	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
AdamGreen	0:616601bde9fb	1240	#endif /* LWIP_TCP_KEEPALIVE */
AdamGreen	0:616601bde9fb	1241
AdamGreen	0:616601bde9fb	1242	pcb->keep_cnt_sent = 0;
AdamGreen	0:616601bde9fb	1243	}
AdamGreen	0:616601bde9fb	1244	return pcb;
AdamGreen	0:616601bde9fb	1245	}
AdamGreen	0:616601bde9fb	1246
AdamGreen	0:616601bde9fb	1247	/**
AdamGreen	0:616601bde9fb	1248	* Creates a new TCP protocol control block but doesn't place it on
AdamGreen	0:616601bde9fb	1249	* any of the TCP PCB lists.
AdamGreen	0:616601bde9fb	1250	* The pcb is not put on any list until binding using tcp_bind().
AdamGreen	0:616601bde9fb	1251	*
AdamGreen	0:616601bde9fb	1252	* @internal: Maybe there should be a idle TCP PCB list where these
AdamGreen	0:616601bde9fb	1253	* PCBs are put on. Port reservation using tcp_bind() is implemented but
AdamGreen	0:616601bde9fb	1254	* allocated pcbs that are not bound can't be killed automatically if wanting
AdamGreen	0:616601bde9fb	1255	* to allocate a pcb with higher prio (@see tcp_kill_prio())
AdamGreen	0:616601bde9fb	1256	*
AdamGreen	0:616601bde9fb	1257	* @return a new tcp_pcb that initially is in state CLOSED
AdamGreen	0:616601bde9fb	1258	*/
AdamGreen	0:616601bde9fb	1259	struct tcp_pcb *
AdamGreen	0:616601bde9fb	1260	tcp_new(void)
AdamGreen	0:616601bde9fb	1261	{
AdamGreen	0:616601bde9fb	1262	return tcp_alloc(TCP_PRIO_NORMAL);
AdamGreen	0:616601bde9fb	1263	}
AdamGreen	0:616601bde9fb	1264
AdamGreen	0:616601bde9fb	1265	/**
AdamGreen	0:616601bde9fb	1266	* Used to specify the argument that should be passed callback
AdamGreen	0:616601bde9fb	1267	* functions.
AdamGreen	0:616601bde9fb	1268	*
AdamGreen	0:616601bde9fb	1269	* @param pcb tcp_pcb to set the callback argument
AdamGreen	0:616601bde9fb	1270	* @param arg void pointer argument to pass to callback functions
AdamGreen	0:616601bde9fb	1271	*/
AdamGreen	0:616601bde9fb	1272	void
AdamGreen	0:616601bde9fb	1273	tcp_arg(struct tcp_pcb pcb, void arg)
AdamGreen	0:616601bde9fb	1274	{
AdamGreen	0:616601bde9fb	1275	pcb->callback_arg = arg;
AdamGreen	0:616601bde9fb	1276	}
AdamGreen	0:616601bde9fb	1277	#if LWIP_CALLBACK_API
AdamGreen	0:616601bde9fb	1278
AdamGreen	0:616601bde9fb	1279	/**
AdamGreen	0:616601bde9fb	1280	* Used to specify the function that should be called when a TCP
AdamGreen	0:616601bde9fb	1281	* connection receives data.
AdamGreen	0:616601bde9fb	1282	*
AdamGreen	0:616601bde9fb	1283	* @param pcb tcp_pcb to set the recv callback
AdamGreen	0:616601bde9fb	1284	* @param recv callback function to call for this pcb when data is received
AdamGreen	0:616601bde9fb	1285	*/
AdamGreen	0:616601bde9fb	1286	void
AdamGreen	0:616601bde9fb	1287	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
AdamGreen	0:616601bde9fb	1288	{
AdamGreen	0:616601bde9fb	1289	pcb->recv = recv;
AdamGreen	0:616601bde9fb	1290	}
AdamGreen	0:616601bde9fb	1291
AdamGreen	0:616601bde9fb	1292	/**
AdamGreen	0:616601bde9fb	1293	* Used to specify the function that should be called when TCP data
AdamGreen	0:616601bde9fb	1294	* has been successfully delivered to the remote host.
AdamGreen	0:616601bde9fb	1295	*
AdamGreen	0:616601bde9fb	1296	* @param pcb tcp_pcb to set the sent callback
AdamGreen	0:616601bde9fb	1297	* @param sent callback function to call for this pcb when data is successfully sent
AdamGreen	0:616601bde9fb	1298	*/
AdamGreen	0:616601bde9fb	1299	void
AdamGreen	0:616601bde9fb	1300	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
AdamGreen	0:616601bde9fb	1301	{
AdamGreen	0:616601bde9fb	1302	pcb->sent = sent;
AdamGreen	0:616601bde9fb	1303	}
AdamGreen	0:616601bde9fb	1304
AdamGreen	0:616601bde9fb	1305	/**
AdamGreen	0:616601bde9fb	1306	* Used to specify the function that should be called when a fatal error
AdamGreen	0:616601bde9fb	1307	* has occured on the connection.
AdamGreen	0:616601bde9fb	1308	*
AdamGreen	0:616601bde9fb	1309	* @param pcb tcp_pcb to set the err callback
AdamGreen	0:616601bde9fb	1310	* @param err callback function to call for this pcb when a fatal error
AdamGreen	0:616601bde9fb	1311	* has occured on the connection
AdamGreen	0:616601bde9fb	1312	*/
AdamGreen	0:616601bde9fb	1313	void
AdamGreen	0:616601bde9fb	1314	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
AdamGreen	0:616601bde9fb	1315	{
AdamGreen	0:616601bde9fb	1316	pcb->errf = err;
AdamGreen	0:616601bde9fb	1317	}
AdamGreen	0:616601bde9fb	1318
AdamGreen	0:616601bde9fb	1319	/**
AdamGreen	0:616601bde9fb	1320	* Used for specifying the function that should be called when a
AdamGreen	0:616601bde9fb	1321	* LISTENing connection has been connected to another host.
AdamGreen	0:616601bde9fb	1322	*
AdamGreen	0:616601bde9fb	1323	* @param pcb tcp_pcb to set the accept callback
AdamGreen	0:616601bde9fb	1324	* @param accept callback function to call for this pcb when LISTENing
AdamGreen	0:616601bde9fb	1325	* connection has been connected to another host
AdamGreen	0:616601bde9fb	1326	*/
AdamGreen	0:616601bde9fb	1327	void
AdamGreen	0:616601bde9fb	1328	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
AdamGreen	0:616601bde9fb	1329	{
AdamGreen	0:616601bde9fb	1330	pcb->accept = accept;
AdamGreen	0:616601bde9fb	1331	}
AdamGreen	0:616601bde9fb	1332	#endif /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	1333
AdamGreen	0:616601bde9fb	1334
AdamGreen	0:616601bde9fb	1335	/**
AdamGreen	0:616601bde9fb	1336	* Used to specify the function that should be called periodically
AdamGreen	0:616601bde9fb	1337	* from TCP. The interval is specified in terms of the TCP coarse
AdamGreen	0:616601bde9fb	1338	* timer interval, which is called twice a second.
AdamGreen	0:616601bde9fb	1339	*
AdamGreen	0:616601bde9fb	1340	*/
AdamGreen	0:616601bde9fb	1341	void
AdamGreen	0:616601bde9fb	1342	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
AdamGreen	0:616601bde9fb	1343	{
AdamGreen	0:616601bde9fb	1344	#if LWIP_CALLBACK_API
AdamGreen	0:616601bde9fb	1345	pcb->poll = poll;
AdamGreen	0:616601bde9fb	1346	#else /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	1347	LWIP_UNUSED_ARG(poll);
AdamGreen	0:616601bde9fb	1348	#endif /* LWIP_CALLBACK_API */
AdamGreen	0:616601bde9fb	1349	pcb->pollinterval = interval;
AdamGreen	0:616601bde9fb	1350	}
AdamGreen	0:616601bde9fb	1351
AdamGreen	0:616601bde9fb	1352	/**
AdamGreen	0:616601bde9fb	1353	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
AdamGreen	0:616601bde9fb	1354	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
AdamGreen	0:616601bde9fb	1355	*
AdamGreen	0:616601bde9fb	1356	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
AdamGreen	0:616601bde9fb	1357	*/
AdamGreen	0:616601bde9fb	1358	void
AdamGreen	0:616601bde9fb	1359	tcp_pcb_purge(struct tcp_pcb *pcb)
AdamGreen	0:616601bde9fb	1360	{
AdamGreen	0:616601bde9fb	1361	if (pcb->state != CLOSED &&
AdamGreen	0:616601bde9fb	1362	pcb->state != TIME_WAIT &&
AdamGreen	0:616601bde9fb	1363	pcb->state != LISTEN) {
AdamGreen	0:616601bde9fb	1364
AdamGreen	0:616601bde9fb	1365	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
AdamGreen	0:616601bde9fb	1366
AdamGreen	0:616601bde9fb	1367	#if TCP_LISTEN_BACKLOG
AdamGreen	0:616601bde9fb	1368	if (pcb->state == SYN_RCVD) {
AdamGreen	0:616601bde9fb	1369	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
AdamGreen	0:616601bde9fb	1370	struct tcp_pcb_listen *lpcb;
AdamGreen	0:616601bde9fb	1371	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
AdamGreen	0:616601bde9fb	1372	tcp_listen_pcbs.listen_pcbs != NULL);
AdamGreen	0:616601bde9fb	1373	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
AdamGreen	0:616601bde9fb	1374	if ((lpcb->local_port == pcb->local_port) &&
AdamGreen	0:616601bde9fb	1375	(ip_addr_isany(&lpcb->local_ip) \|\|
AdamGreen	0:616601bde9fb	1376	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
AdamGreen	0:616601bde9fb	1377	/* port and address of the listen pcb match the timed-out pcb */
AdamGreen	0:616601bde9fb	1378	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
AdamGreen	0:616601bde9fb	1379	lpcb->accepts_pending > 0);
AdamGreen	0:616601bde9fb	1380	lpcb->accepts_pending--;
AdamGreen	0:616601bde9fb	1381	break;
AdamGreen	0:616601bde9fb	1382	}
AdamGreen	0:616601bde9fb	1383	}
AdamGreen	0:616601bde9fb	1384	}
AdamGreen	0:616601bde9fb	1385	#endif /* TCP_LISTEN_BACKLOG */
AdamGreen	0:616601bde9fb	1386
AdamGreen	0:616601bde9fb	1387
AdamGreen	0:616601bde9fb	1388	if (pcb->refused_data != NULL) {
AdamGreen	0:616601bde9fb	1389	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
AdamGreen	0:616601bde9fb	1390	pbuf_free(pcb->refused_data);
AdamGreen	0:616601bde9fb	1391	pcb->refused_data = NULL;
AdamGreen	0:616601bde9fb	1392	}
AdamGreen	0:616601bde9fb	1393	if (pcb->unsent != NULL) {
AdamGreen	0:616601bde9fb	1394	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
AdamGreen	0:616601bde9fb	1395	}
AdamGreen	0:616601bde9fb	1396	if (pcb->unacked != NULL) {
AdamGreen	0:616601bde9fb	1397	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
AdamGreen	0:616601bde9fb	1398	}
AdamGreen	0:616601bde9fb	1399	#if TCP_QUEUE_OOSEQ
AdamGreen	0:616601bde9fb	1400	if (pcb->ooseq != NULL) {
AdamGreen	0:616601bde9fb	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
AdamGreen	0:616601bde9fb	1402	}
AdamGreen	0:616601bde9fb	1403	tcp_segs_free(pcb->ooseq);
AdamGreen	0:616601bde9fb	1404	pcb->ooseq = NULL;
AdamGreen	0:616601bde9fb	1405	#endif /* TCP_QUEUE_OOSEQ */
AdamGreen	0:616601bde9fb	1406
AdamGreen	0:616601bde9fb	1407	/* Stop the retransmission timer as it will expect data on unacked
AdamGreen	0:616601bde9fb	1408	queue if it fires */
AdamGreen	0:616601bde9fb	1409	pcb->rtime = -1;
AdamGreen	0:616601bde9fb	1410
AdamGreen	0:616601bde9fb	1411	tcp_segs_free(pcb->unsent);
AdamGreen	0:616601bde9fb	1412	tcp_segs_free(pcb->unacked);
AdamGreen	0:616601bde9fb	1413	pcb->unacked = pcb->unsent = NULL;
AdamGreen	0:616601bde9fb	1414	#if TCP_OVERSIZE
AdamGreen	0:616601bde9fb	1415	pcb->unsent_oversize = 0;
AdamGreen	0:616601bde9fb	1416	#endif /* TCP_OVERSIZE */
AdamGreen	0:616601bde9fb	1417	}
AdamGreen	0:616601bde9fb	1418	}
AdamGreen	0:616601bde9fb	1419
AdamGreen	0:616601bde9fb	1420	/**
AdamGreen	0:616601bde9fb	1421	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
AdamGreen	0:616601bde9fb	1422	*
AdamGreen	0:616601bde9fb	1423	* @param pcblist PCB list to purge.
AdamGreen	0:616601bde9fb	1424	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
AdamGreen	0:616601bde9fb	1425	*/
AdamGreen	0:616601bde9fb	1426	void
AdamGreen	0:616601bde9fb	1427	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
AdamGreen	0:616601bde9fb	1428	{
AdamGreen	0:616601bde9fb	1429	TCP_RMV(pcblist, pcb);
AdamGreen	0:616601bde9fb	1430
AdamGreen	0:616601bde9fb	1431	tcp_pcb_purge(pcb);
AdamGreen	0:616601bde9fb	1432
AdamGreen	0:616601bde9fb	1433	/* if there is an outstanding delayed ACKs, send it */
AdamGreen	0:616601bde9fb	1434	if (pcb->state != TIME_WAIT &&
AdamGreen	0:616601bde9fb	1435	pcb->state != LISTEN &&
AdamGreen	0:616601bde9fb	1436	pcb->flags & TF_ACK_DELAY) {
AdamGreen	0:616601bde9fb	1437	pcb->flags \|= TF_ACK_NOW;
AdamGreen	0:616601bde9fb	1438	tcp_output(pcb);
AdamGreen	0:616601bde9fb	1439	}
AdamGreen	0:616601bde9fb	1440
AdamGreen	0:616601bde9fb	1441	if (pcb->state != LISTEN) {
AdamGreen	0:616601bde9fb	1442	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
AdamGreen	0:616601bde9fb	1443	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
AdamGreen	0:616601bde9fb	1444	#if TCP_QUEUE_OOSEQ
AdamGreen	0:616601bde9fb	1445	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
AdamGreen	0:616601bde9fb	1446	#endif /* TCP_QUEUE_OOSEQ */
AdamGreen	0:616601bde9fb	1447	}
AdamGreen	0:616601bde9fb	1448
AdamGreen	0:616601bde9fb	1449	pcb->state = CLOSED;
AdamGreen	0:616601bde9fb	1450
AdamGreen	0:616601bde9fb	1451	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
AdamGreen	0:616601bde9fb	1452	}
AdamGreen	0:616601bde9fb	1453
AdamGreen	0:616601bde9fb	1454	/**
AdamGreen	0:616601bde9fb	1455	* Calculates a new initial sequence number for new connections.
AdamGreen	0:616601bde9fb	1456	*
AdamGreen	0:616601bde9fb	1457	* @return u32_t pseudo random sequence number
AdamGreen	0:616601bde9fb	1458	*/
AdamGreen	0:616601bde9fb	1459	u32_t
AdamGreen	0:616601bde9fb	1460	tcp_next_iss(void)
AdamGreen	0:616601bde9fb	1461	{
AdamGreen	0:616601bde9fb	1462	static u32_t iss = 6510;
AdamGreen	0:616601bde9fb	1463
AdamGreen	0:616601bde9fb	1464	iss += tcp_ticks; /* XXX */
AdamGreen	0:616601bde9fb	1465	return iss;
AdamGreen	0:616601bde9fb	1466	}
AdamGreen	0:616601bde9fb	1467
AdamGreen	0:616601bde9fb	1468	#if TCP_CALCULATE_EFF_SEND_MSS
AdamGreen	0:616601bde9fb	1469	/**
AdamGreen	0:616601bde9fb	1470	* Calcluates the effective send mss that can be used for a specific IP address
AdamGreen	0:616601bde9fb	1471	* by using ip_route to determin the netif used to send to the address and
AdamGreen	0:616601bde9fb	1472	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
AdamGreen	0:616601bde9fb	1473	*/
AdamGreen	0:616601bde9fb	1474	u16_t
AdamGreen	0:616601bde9fb	1475	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
AdamGreen	0:616601bde9fb	1476	{
AdamGreen	0:616601bde9fb	1477	u16_t mss_s;
AdamGreen	0:616601bde9fb	1478	struct netif *outif;
AdamGreen	0:616601bde9fb	1479
AdamGreen	0:616601bde9fb	1480	outif = ip_route(addr);
AdamGreen	0:616601bde9fb	1481	if ((outif != NULL) && (outif->mtu != 0)) {
AdamGreen	0:616601bde9fb	1482	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
AdamGreen	0:616601bde9fb	1483	/* RFC 1122, chap 4.2.2.6:
AdamGreen	0:616601bde9fb	1484	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
AdamGreen	0:616601bde9fb	1485	* We correct for TCP options in tcp_write(), and don't support IP options.
AdamGreen	0:616601bde9fb	1486	*/
AdamGreen	0:616601bde9fb	1487	sendmss = LWIP_MIN(sendmss, mss_s);
AdamGreen	0:616601bde9fb	1488	}
AdamGreen	0:616601bde9fb	1489	return sendmss;
AdamGreen	0:616601bde9fb	1490	}
AdamGreen	0:616601bde9fb	1491	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
AdamGreen	0:616601bde9fb	1492
AdamGreen	0:616601bde9fb	1493	const char*
AdamGreen	0:616601bde9fb	1494	tcp_debug_state_str(enum tcp_state s)
AdamGreen	0:616601bde9fb	1495	{
AdamGreen	0:616601bde9fb	1496	return tcp_state_str[s];
AdamGreen	0:616601bde9fb	1497	}
AdamGreen	0:616601bde9fb	1498
AdamGreen	0:616601bde9fb	1499	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
AdamGreen	0:616601bde9fb	1500	/**
AdamGreen	0:616601bde9fb	1501	* Print a tcp header for debugging purposes.
AdamGreen	0:616601bde9fb	1502	*
AdamGreen	0:616601bde9fb	1503	* @param tcphdr pointer to a struct tcp_hdr
AdamGreen	0:616601bde9fb	1504	*/
AdamGreen	0:616601bde9fb	1505	void
AdamGreen	0:616601bde9fb	1506	tcp_debug_print(struct tcp_hdr *tcphdr)
AdamGreen	0:616601bde9fb	1507	{
AdamGreen	0:616601bde9fb	1508	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
AdamGreen	0:616601bde9fb	1509	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen	0:616601bde9fb	1510	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
AdamGreen	0:616601bde9fb	1511	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
AdamGreen	0:616601bde9fb	1512	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen	0:616601bde9fb	1513	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
AdamGreen	0:616601bde9fb	1514	ntohl(tcphdr->seqno)));
AdamGreen	0:616601bde9fb	1515	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen	0:616601bde9fb	1516	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
AdamGreen	0:616601bde9fb	1517	ntohl(tcphdr->ackno)));
AdamGreen	0:616601bde9fb	1518	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen	0:616601bde9fb	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 (",
AdamGreen	0:616601bde9fb	1520	TCPH_HDRLEN(tcphdr),
AdamGreen	0:616601bde9fb	1521	TCPH_FLAGS(tcphdr) >> 5 & 1,
AdamGreen	0:616601bde9fb	1522	TCPH_FLAGS(tcphdr) >> 4 & 1,
AdamGreen	0:616601bde9fb	1523	TCPH_FLAGS(tcphdr) >> 3 & 1,
AdamGreen	0:616601bde9fb	1524	TCPH_FLAGS(tcphdr) >> 2 & 1,
AdamGreen	0:616601bde9fb	1525	TCPH_FLAGS(tcphdr) >> 1 & 1,
AdamGreen	0:616601bde9fb	1526	TCPH_FLAGS(tcphdr) & 1,
AdamGreen	0:616601bde9fb	1527	ntohs(tcphdr->wnd)));
AdamGreen	0:616601bde9fb	1528	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
AdamGreen	0:616601bde9fb	1529	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
AdamGreen	0:616601bde9fb	1530	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen	0:616601bde9fb	1531	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
AdamGreen	0:616601bde9fb	1532	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
AdamGreen	0:616601bde9fb	1533	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen	0:616601bde9fb	1534	}
AdamGreen	0:616601bde9fb	1535
AdamGreen	0:616601bde9fb	1536	/**
AdamGreen	0:616601bde9fb	1537	* Print a tcp state for debugging purposes.
AdamGreen	0:616601bde9fb	1538	*
AdamGreen	0:616601bde9fb	1539	* @param s enum tcp_state to print
AdamGreen	0:616601bde9fb	1540	*/
AdamGreen	0:616601bde9fb	1541	void
AdamGreen	0:616601bde9fb	1542	tcp_debug_print_state(enum tcp_state s)
AdamGreen	0:616601bde9fb	1543	{
AdamGreen	0:616601bde9fb	1544	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
AdamGreen	0:616601bde9fb	1545	}
AdamGreen	0:616601bde9fb	1546
AdamGreen	0:616601bde9fb	1547	/**
AdamGreen	0:616601bde9fb	1548	* Print tcp flags for debugging purposes.
AdamGreen	0:616601bde9fb	1549	*
AdamGreen	0:616601bde9fb	1550	* @param flags tcp flags, all active flags are printed
AdamGreen	0:616601bde9fb	1551	*/
AdamGreen	0:616601bde9fb	1552	void
AdamGreen	0:616601bde9fb	1553	tcp_debug_print_flags(u8_t flags)
AdamGreen	0:616601bde9fb	1554	{
AdamGreen	0:616601bde9fb	1555	if (flags & TCP_FIN) {
AdamGreen	0:616601bde9fb	1556	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
AdamGreen	0:616601bde9fb	1557	}
AdamGreen	0:616601bde9fb	1558	if (flags & TCP_SYN) {
AdamGreen	0:616601bde9fb	1559	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
AdamGreen	0:616601bde9fb	1560	}
AdamGreen	0:616601bde9fb	1561	if (flags & TCP_RST) {
AdamGreen	0:616601bde9fb	1562	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
AdamGreen	0:616601bde9fb	1563	}
AdamGreen	0:616601bde9fb	1564	if (flags & TCP_PSH) {
AdamGreen	0:616601bde9fb	1565	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
AdamGreen	0:616601bde9fb	1566	}
AdamGreen	0:616601bde9fb	1567	if (flags & TCP_ACK) {
AdamGreen	0:616601bde9fb	1568	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
AdamGreen	0:616601bde9fb	1569	}
AdamGreen	0:616601bde9fb	1570	if (flags & TCP_URG) {
AdamGreen	0:616601bde9fb	1571	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
AdamGreen	0:616601bde9fb	1572	}
AdamGreen	0:616601bde9fb	1573	if (flags & TCP_ECE) {
AdamGreen	0:616601bde9fb	1574	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
AdamGreen	0:616601bde9fb	1575	}
AdamGreen	0:616601bde9fb	1576	if (flags & TCP_CWR) {
AdamGreen	0:616601bde9fb	1577	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
AdamGreen	0:616601bde9fb	1578	}
AdamGreen	0:616601bde9fb	1579	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
AdamGreen	0:616601bde9fb	1580	}
AdamGreen	0:616601bde9fb	1581
AdamGreen	0:616601bde9fb	1582	/**
AdamGreen	0:616601bde9fb	1583	* Print all tcp_pcbs in every list for debugging purposes.
AdamGreen	0:616601bde9fb	1584	*/
AdamGreen	0:616601bde9fb	1585	void
AdamGreen	0:616601bde9fb	1586	tcp_debug_print_pcbs(void)
AdamGreen	0:616601bde9fb	1587	{
AdamGreen	0:616601bde9fb	1588	struct tcp_pcb *pcb;
AdamGreen	0:616601bde9fb	1589	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
AdamGreen	0:616601bde9fb	1590	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen	0:616601bde9fb	1591	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
AdamGreen	0:616601bde9fb	1592	pcb->local_port, pcb->remote_port,
AdamGreen	0:616601bde9fb	1593	pcb->snd_nxt, pcb->rcv_nxt));
AdamGreen	0:616601bde9fb	1594	tcp_debug_print_state(pcb->state);
AdamGreen	0:616601bde9fb	1595	}
AdamGreen	0:616601bde9fb	1596	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
AdamGreen	0:616601bde9fb	1597	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen	0:616601bde9fb	1598	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
AdamGreen	0:616601bde9fb	1599	pcb->local_port, pcb->remote_port,
AdamGreen	0:616601bde9fb	1600	pcb->snd_nxt, pcb->rcv_nxt));
AdamGreen	0:616601bde9fb	1601	tcp_debug_print_state(pcb->state);
AdamGreen	0:616601bde9fb	1602	}
AdamGreen	0:616601bde9fb	1603	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
AdamGreen	0:616601bde9fb	1604	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen	0:616601bde9fb	1605	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
AdamGreen	0:616601bde9fb	1606	pcb->local_port, pcb->remote_port,
AdamGreen	0:616601bde9fb	1607	pcb->snd_nxt, pcb->rcv_nxt));
AdamGreen	0:616601bde9fb	1608	tcp_debug_print_state(pcb->state);
AdamGreen	0:616601bde9fb	1609	}
AdamGreen	0:616601bde9fb	1610	}
AdamGreen	0:616601bde9fb	1611
AdamGreen	0:616601bde9fb	1612	/**
AdamGreen	0:616601bde9fb	1613	* Check state consistency of the tcp_pcb lists.
AdamGreen	0:616601bde9fb	1614	*/
AdamGreen	0:616601bde9fb	1615	s16_t
AdamGreen	0:616601bde9fb	1616	tcp_pcbs_sane(void)
AdamGreen	0:616601bde9fb	1617	{
AdamGreen	0:616601bde9fb	1618	struct tcp_pcb *pcb;
AdamGreen	0:616601bde9fb	1619	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen	0:616601bde9fb	1620	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
AdamGreen	0:616601bde9fb	1621	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
AdamGreen	0:616601bde9fb	1622	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
AdamGreen	0:616601bde9fb	1623	}
AdamGreen	0:616601bde9fb	1624	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen	0:616601bde9fb	1625	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
AdamGreen	0:616601bde9fb	1626	}
AdamGreen	0:616601bde9fb	1627	return 1;
AdamGreen	0:616601bde9fb	1628	}
AdamGreen	0:616601bde9fb	1629	#endif /* TCP_DEBUG */
AdamGreen	0:616601bde9fb	1630
AdamGreen	0:616601bde9fb	1631	#endif /* LWIP_TCP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	23 Feb 2012
Imports:	113
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	4
Followers:	6

NetStack/lwip/core/tcp.c@1:c7958aa34fa1, 2012-02-25 (annotated)

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