lwip - delta param

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delta param

core/tcp.c@29:da6f39d13880, 2015-01-08 (annotated)

Committer:: klauss
Date:: Thu Jan 08 23:42:30 2015 +0000
Revision:: 29:da6f39d13880
Parent:: 0:51ac1d130fd4

wip

Who changed what in which revision?

User	Revision	Line number	New contents of line
mbed_official	0:51ac1d130fd4	1	/**
mbed_official	0:51ac1d130fd4	2	* @file
mbed_official	0:51ac1d130fd4	3	* Transmission Control Protocol for IP
mbed_official	0:51ac1d130fd4	4	*
mbed_official	0:51ac1d130fd4	5	* This file contains common functions for the TCP implementation, such as functinos
mbed_official	0:51ac1d130fd4	6	* for manipulating the data structures and the TCP timer functions. TCP functions
mbed_official	0:51ac1d130fd4	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
mbed_official	0:51ac1d130fd4	8	*
mbed_official	0:51ac1d130fd4	9	*/
mbed_official	0:51ac1d130fd4	10
mbed_official	0:51ac1d130fd4	11	/*
mbed_official	0:51ac1d130fd4	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed_official	0:51ac1d130fd4	13	* All rights reserved.
mbed_official	0:51ac1d130fd4	14	*
mbed_official	0:51ac1d130fd4	15	* Redistribution and use in source and binary forms, with or without modification,
mbed_official	0:51ac1d130fd4	16	* are permitted provided that the following conditions are met:
mbed_official	0:51ac1d130fd4	17	*
mbed_official	0:51ac1d130fd4	18	* 1. Redistributions of source code must retain the above copyright notice,
mbed_official	0:51ac1d130fd4	19	* this list of conditions and the following disclaimer.
mbed_official	0:51ac1d130fd4	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official	0:51ac1d130fd4	21	* this list of conditions and the following disclaimer in the documentation
mbed_official	0:51ac1d130fd4	22	* and/or other materials provided with the distribution.
mbed_official	0:51ac1d130fd4	23	* 3. The name of the author may not be used to endorse or promote products
mbed_official	0:51ac1d130fd4	24	* derived from this software without specific prior written permission.
mbed_official	0:51ac1d130fd4	25	*
mbed_official	0:51ac1d130fd4	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed_official	0:51ac1d130fd4	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed_official	0:51ac1d130fd4	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed_official	0:51ac1d130fd4	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed_official	0:51ac1d130fd4	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed_official	0:51ac1d130fd4	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed_official	0:51ac1d130fd4	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed_official	0:51ac1d130fd4	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed_official	0:51ac1d130fd4	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed_official	0:51ac1d130fd4	35	* OF SUCH DAMAGE.
mbed_official	0:51ac1d130fd4	36	*
mbed_official	0:51ac1d130fd4	37	* This file is part of the lwIP TCP/IP stack.
mbed_official	0:51ac1d130fd4	38	*
mbed_official	0:51ac1d130fd4	39	* Author: Adam Dunkels <adam@sics.se>
mbed_official	0:51ac1d130fd4	40	*
mbed_official	0:51ac1d130fd4	41	*/
mbed_official	0:51ac1d130fd4	42
mbed_official	0:51ac1d130fd4	43	#include "lwip/opt.h"
mbed_official	0:51ac1d130fd4	44
mbed_official	0:51ac1d130fd4	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
mbed_official	0:51ac1d130fd4	46
mbed_official	0:51ac1d130fd4	47	#include "lwip/def.h"
mbed_official	0:51ac1d130fd4	48	#include "lwip/mem.h"
mbed_official	0:51ac1d130fd4	49	#include "lwip/memp.h"
mbed_official	0:51ac1d130fd4	50	#include "lwip/snmp.h"
mbed_official	0:51ac1d130fd4	51	#include "lwip/tcp.h"
mbed_official	0:51ac1d130fd4	52	#include "lwip/tcp_impl.h"
mbed_official	0:51ac1d130fd4	53	#include "lwip/debug.h"
mbed_official	0:51ac1d130fd4	54	#include "lwip/stats.h"
mbed_official	0:51ac1d130fd4	55
mbed_official	0:51ac1d130fd4	56	#include <string.h>
mbed_official	0:51ac1d130fd4	57
mbed_official	0:51ac1d130fd4	58	const char * const tcp_state_str[] = {
mbed_official	0:51ac1d130fd4	59	"CLOSED",
mbed_official	0:51ac1d130fd4	60	"LISTEN",
mbed_official	0:51ac1d130fd4	61	"SYN_SENT",
mbed_official	0:51ac1d130fd4	62	"SYN_RCVD",
mbed_official	0:51ac1d130fd4	63	"ESTABLISHED",
mbed_official	0:51ac1d130fd4	64	"FIN_WAIT_1",
mbed_official	0:51ac1d130fd4	65	"FIN_WAIT_2",
mbed_official	0:51ac1d130fd4	66	"CLOSE_WAIT",
mbed_official	0:51ac1d130fd4	67	"CLOSING",
mbed_official	0:51ac1d130fd4	68	"LAST_ACK",
mbed_official	0:51ac1d130fd4	69	"TIME_WAIT"
mbed_official	0:51ac1d130fd4	70	};
mbed_official	0:51ac1d130fd4	71
mbed_official	0:51ac1d130fd4	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
mbed_official	0:51ac1d130fd4	73	u32_t tcp_ticks;
mbed_official	0:51ac1d130fd4	74	const u8_t tcp_backoff[13] =
mbed_official	0:51ac1d130fd4	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
mbed_official	0:51ac1d130fd4	76	/* Times per slowtmr hits */
mbed_official	0:51ac1d130fd4	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
mbed_official	0:51ac1d130fd4	78
mbed_official	0:51ac1d130fd4	79	/* The TCP PCB lists. */
mbed_official	0:51ac1d130fd4	80
mbed_official	0:51ac1d130fd4	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
mbed_official	0:51ac1d130fd4	82	struct tcp_pcb *tcp_bound_pcbs;
mbed_official	0:51ac1d130fd4	83	/** List of all TCP PCBs in LISTEN state */
mbed_official	0:51ac1d130fd4	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
mbed_official	0:51ac1d130fd4	85	/** List of all TCP PCBs that are in a state in which
mbed_official	0:51ac1d130fd4	86	* they accept or send data. */
mbed_official	0:51ac1d130fd4	87	struct tcp_pcb *tcp_active_pcbs;
mbed_official	0:51ac1d130fd4	88	/** List of all TCP PCBs in TIME-WAIT state */
mbed_official	0:51ac1d130fd4	89	struct tcp_pcb *tcp_tw_pcbs;
mbed_official	0:51ac1d130fd4	90
mbed_official	0:51ac1d130fd4	91	#define NUM_TCP_PCB_LISTS 4
mbed_official	0:51ac1d130fd4	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
mbed_official	0:51ac1d130fd4	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
mbed_official	0:51ac1d130fd4	94	struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
mbed_official	0:51ac1d130fd4	95	&tcp_active_pcbs, &tcp_tw_pcbs};
mbed_official	0:51ac1d130fd4	96
mbed_official	0:51ac1d130fd4	97	/** Only used for temporary storage. */
mbed_official	0:51ac1d130fd4	98	struct tcp_pcb *tcp_tmp_pcb;
mbed_official	0:51ac1d130fd4	99
mbed_official	0:51ac1d130fd4	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
mbed_official	0:51ac1d130fd4	101	static u8_t tcp_timer;
mbed_official	0:51ac1d130fd4	102	static u16_t tcp_new_port(void);
mbed_official	0:51ac1d130fd4	103
mbed_official	0:51ac1d130fd4	104	/**
mbed_official	0:51ac1d130fd4	105	* Called periodically to dispatch TCP timers.
mbed_official	0:51ac1d130fd4	106	*
mbed_official	0:51ac1d130fd4	107	*/
mbed_official	0:51ac1d130fd4	108	void
mbed_official	0:51ac1d130fd4	109	tcp_tmr(void)
mbed_official	0:51ac1d130fd4	110	{
mbed_official	0:51ac1d130fd4	111	/* Call tcp_fasttmr() every 250 ms */
mbed_official	0:51ac1d130fd4	112	tcp_fasttmr();
mbed_official	0:51ac1d130fd4	113
mbed_official	0:51ac1d130fd4	114	if (++tcp_timer & 1) {
mbed_official	0:51ac1d130fd4	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
mbed_official	0:51ac1d130fd4	116	tcp_tmr() is called. */
mbed_official	0:51ac1d130fd4	117	tcp_slowtmr();
mbed_official	0:51ac1d130fd4	118	}
mbed_official	0:51ac1d130fd4	119	}
mbed_official	0:51ac1d130fd4	120
mbed_official	0:51ac1d130fd4	121	/**
mbed_official	0:51ac1d130fd4	122	* Closes the TX side of a connection held by the PCB.
mbed_official	0:51ac1d130fd4	123	* For tcp_close(), a RST is sent if the application didn't receive all data
mbed_official	0:51ac1d130fd4	124	* (tcp_recved() not called for all data passed to recv callback).
mbed_official	0:51ac1d130fd4	125	*
mbed_official	0:51ac1d130fd4	126	* Listening pcbs are freed and may not be referenced any more.
mbed_official	0:51ac1d130fd4	127	* Connection pcbs are freed if not yet connected and may not be referenced
mbed_official	0:51ac1d130fd4	128	* any more. If a connection is established (at least SYN received or in
mbed_official	0:51ac1d130fd4	129	* a closing state), the connection is closed, and put in a closing state.
mbed_official	0:51ac1d130fd4	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
mbed_official	0:51ac1d130fd4	131	* unsafe to reference it.
mbed_official	0:51ac1d130fd4	132	*
mbed_official	0:51ac1d130fd4	133	* @param pcb the tcp_pcb to close
mbed_official	0:51ac1d130fd4	134	* @return ERR_OK if connection has been closed
mbed_official	0:51ac1d130fd4	135	* another err_t if closing failed and pcb is not freed
mbed_official	0:51ac1d130fd4	136	*/
mbed_official	0:51ac1d130fd4	137	static err_t
mbed_official	0:51ac1d130fd4	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
mbed_official	0:51ac1d130fd4	139	{
mbed_official	0:51ac1d130fd4	140	err_t err;
mbed_official	0:51ac1d130fd4	141
mbed_official	0:51ac1d130fd4	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
mbed_official	0:51ac1d130fd4	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
mbed_official	0:51ac1d130fd4	144	/* Not all data received by application, send RST to tell the remote
mbed_official	0:51ac1d130fd4	145	side about this. */
mbed_official	0:51ac1d130fd4	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
mbed_official	0:51ac1d130fd4	147
mbed_official	0:51ac1d130fd4	148	/* don't call tcp_abort here: we must not deallocate the pcb since
mbed_official	0:51ac1d130fd4	149	that might not be expected when calling tcp_close */
mbed_official	0:51ac1d130fd4	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
mbed_official	0:51ac1d130fd4	151	pcb->local_port, pcb->remote_port);
mbed_official	0:51ac1d130fd4	152
mbed_official	0:51ac1d130fd4	153	tcp_pcb_purge(pcb);
mbed_official	0:51ac1d130fd4	154
mbed_official	0:51ac1d130fd4	155	/* TODO: to which state do we move now? */
mbed_official	0:51ac1d130fd4	156
mbed_official	0:51ac1d130fd4	157	/* move to TIME_WAIT since we close actively */
mbed_official	0:51ac1d130fd4	158	TCP_RMV(&tcp_active_pcbs, pcb);
mbed_official	0:51ac1d130fd4	159	pcb->state = TIME_WAIT;
mbed_official	0:51ac1d130fd4	160	TCP_REG(&tcp_tw_pcbs, pcb);
mbed_official	0:51ac1d130fd4	161
mbed_official	0:51ac1d130fd4	162	return ERR_OK;
mbed_official	0:51ac1d130fd4	163	}
mbed_official	0:51ac1d130fd4	164	}
mbed_official	0:51ac1d130fd4	165
mbed_official	0:51ac1d130fd4	166	switch (pcb->state) {
mbed_official	0:51ac1d130fd4	167	case CLOSED:
mbed_official	0:51ac1d130fd4	168	/* Closing a pcb in the CLOSED state might seem erroneous,
mbed_official	0:51ac1d130fd4	169	* however, it is in this state once allocated and as yet unused
mbed_official	0:51ac1d130fd4	170	* and the user needs some way to free it should the need arise.
mbed_official	0:51ac1d130fd4	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
mbed_official	0:51ac1d130fd4	172	* or for a pcb that has been used and then entered the CLOSED state
mbed_official	0:51ac1d130fd4	173	* is erroneous, but this should never happen as the pcb has in those cases
mbed_official	0:51ac1d130fd4	174	* been freed, and so any remaining handles are bogus. */
mbed_official	0:51ac1d130fd4	175	err = ERR_OK;
mbed_official	0:51ac1d130fd4	176	if (pcb->local_port != 0) {
mbed_official	0:51ac1d130fd4	177	TCP_RMV(&tcp_bound_pcbs, pcb);
mbed_official	0:51ac1d130fd4	178	}
mbed_official	0:51ac1d130fd4	179	memp_free(MEMP_TCP_PCB, pcb);
mbed_official	0:51ac1d130fd4	180	pcb = NULL;
mbed_official	0:51ac1d130fd4	181	break;
mbed_official	0:51ac1d130fd4	182	case LISTEN:
mbed_official	0:51ac1d130fd4	183	err = ERR_OK;
mbed_official	0:51ac1d130fd4	184	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
mbed_official	0:51ac1d130fd4	185	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
mbed_official	0:51ac1d130fd4	186	pcb = NULL;
mbed_official	0:51ac1d130fd4	187	break;
mbed_official	0:51ac1d130fd4	188	case SYN_SENT:
mbed_official	0:51ac1d130fd4	189	err = ERR_OK;
mbed_official	0:51ac1d130fd4	190	tcp_pcb_remove(&tcp_active_pcbs, pcb);
mbed_official	0:51ac1d130fd4	191	memp_free(MEMP_TCP_PCB, pcb);
mbed_official	0:51ac1d130fd4	192	pcb = NULL;
mbed_official	0:51ac1d130fd4	193	snmp_inc_tcpattemptfails();
mbed_official	0:51ac1d130fd4	194	break;
mbed_official	0:51ac1d130fd4	195	case SYN_RCVD:
mbed_official	0:51ac1d130fd4	196	err = tcp_send_fin(pcb);
mbed_official	0:51ac1d130fd4	197	if (err == ERR_OK) {
mbed_official	0:51ac1d130fd4	198	snmp_inc_tcpattemptfails();
mbed_official	0:51ac1d130fd4	199	pcb->state = FIN_WAIT_1;
mbed_official	0:51ac1d130fd4	200	}
mbed_official	0:51ac1d130fd4	201	break;
mbed_official	0:51ac1d130fd4	202	case ESTABLISHED:
mbed_official	0:51ac1d130fd4	203	err = tcp_send_fin(pcb);
mbed_official	0:51ac1d130fd4	204	if (err == ERR_OK) {
mbed_official	0:51ac1d130fd4	205	snmp_inc_tcpestabresets();
mbed_official	0:51ac1d130fd4	206	pcb->state = FIN_WAIT_1;
mbed_official	0:51ac1d130fd4	207	}
mbed_official	0:51ac1d130fd4	208	break;
mbed_official	0:51ac1d130fd4	209	case CLOSE_WAIT:
mbed_official	0:51ac1d130fd4	210	err = tcp_send_fin(pcb);
mbed_official	0:51ac1d130fd4	211	if (err == ERR_OK) {
mbed_official	0:51ac1d130fd4	212	snmp_inc_tcpestabresets();
mbed_official	0:51ac1d130fd4	213	pcb->state = LAST_ACK;
mbed_official	0:51ac1d130fd4	214	}
mbed_official	0:51ac1d130fd4	215	break;
mbed_official	0:51ac1d130fd4	216	default:
mbed_official	0:51ac1d130fd4	217	/* Has already been closed, do nothing. */
mbed_official	0:51ac1d130fd4	218	err = ERR_OK;
mbed_official	0:51ac1d130fd4	219	pcb = NULL;
mbed_official	0:51ac1d130fd4	220	break;
mbed_official	0:51ac1d130fd4	221	}
mbed_official	0:51ac1d130fd4	222
mbed_official	0:51ac1d130fd4	223	if (pcb != NULL && err == ERR_OK) {
mbed_official	0:51ac1d130fd4	224	/* To ensure all data has been sent when tcp_close returns, we have
mbed_official	0:51ac1d130fd4	225	to make sure tcp_output doesn't fail.
mbed_official	0:51ac1d130fd4	226	Since we don't really have to ensure all data has been sent when tcp_close
mbed_official	0:51ac1d130fd4	227	returns (unsent data is sent from tcp timer functions, also), we don't care
mbed_official	0:51ac1d130fd4	228	for the return value of tcp_output for now. */
mbed_official	0:51ac1d130fd4	229	/* @todo: When implementing SO_LINGER, this must be changed somehow:
mbed_official	0:51ac1d130fd4	230	If SOF_LINGER is set, the data should be sent and acked before close returns.
mbed_official	0:51ac1d130fd4	231	This can only be valid for sequential APIs, not for the raw API. */
mbed_official	0:51ac1d130fd4	232	tcp_output(pcb);
mbed_official	0:51ac1d130fd4	233	}
mbed_official	0:51ac1d130fd4	234	return err;
mbed_official	0:51ac1d130fd4	235	}
mbed_official	0:51ac1d130fd4	236
mbed_official	0:51ac1d130fd4	237	/**
mbed_official	0:51ac1d130fd4	238	* Closes the connection held by the PCB.
mbed_official	0:51ac1d130fd4	239	*
mbed_official	0:51ac1d130fd4	240	* Listening pcbs are freed and may not be referenced any more.
mbed_official	0:51ac1d130fd4	241	* Connection pcbs are freed if not yet connected and may not be referenced
mbed_official	0:51ac1d130fd4	242	* any more. If a connection is established (at least SYN received or in
mbed_official	0:51ac1d130fd4	243	* a closing state), the connection is closed, and put in a closing state.
mbed_official	0:51ac1d130fd4	244	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
mbed_official	0:51ac1d130fd4	245	* unsafe to reference it (unless an error is returned).
mbed_official	0:51ac1d130fd4	246	*
mbed_official	0:51ac1d130fd4	247	* @param pcb the tcp_pcb to close
mbed_official	0:51ac1d130fd4	248	* @return ERR_OK if connection has been closed
mbed_official	0:51ac1d130fd4	249	* another err_t if closing failed and pcb is not freed
mbed_official	0:51ac1d130fd4	250	*/
mbed_official	0:51ac1d130fd4	251	err_t
mbed_official	0:51ac1d130fd4	252	tcp_close(struct tcp_pcb *pcb)
mbed_official	0:51ac1d130fd4	253	{
mbed_official	0:51ac1d130fd4	254	#if TCP_DEBUG
mbed_official	0:51ac1d130fd4	255	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
mbed_official	0:51ac1d130fd4	256	tcp_debug_print_state(pcb->state);
mbed_official	0:51ac1d130fd4	257	#endif /* TCP_DEBUG */
mbed_official	0:51ac1d130fd4	258
mbed_official	0:51ac1d130fd4	259	if (pcb->state != LISTEN) {
mbed_official	0:51ac1d130fd4	260	/* Set a flag not to receive any more data... */
mbed_official	0:51ac1d130fd4	261	pcb->flags \|= TF_RXCLOSED;
mbed_official	0:51ac1d130fd4	262	}
mbed_official	0:51ac1d130fd4	263	/* ... and close */
mbed_official	0:51ac1d130fd4	264	return tcp_close_shutdown(pcb, 1);
mbed_official	0:51ac1d130fd4	265	}
mbed_official	0:51ac1d130fd4	266
mbed_official	0:51ac1d130fd4	267	/**
mbed_official	0:51ac1d130fd4	268	* Causes all or part of a full-duplex connection of this PCB to be shut down.
mbed_official	0:51ac1d130fd4	269	* This doesn't deallocate the PCB!
mbed_official	0:51ac1d130fd4	270	*
mbed_official	0:51ac1d130fd4	271	* @param pcb PCB to shutdown
mbed_official	0:51ac1d130fd4	272	* @param shut_rx shut down receive side if this is != 0
mbed_official	0:51ac1d130fd4	273	* @param shut_tx shut down send side if this is != 0
mbed_official	0:51ac1d130fd4	274	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
mbed_official	0:51ac1d130fd4	275	* another err_t on error.
mbed_official	0:51ac1d130fd4	276	*/
mbed_official	0:51ac1d130fd4	277	err_t
mbed_official	0:51ac1d130fd4	278	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
mbed_official	0:51ac1d130fd4	279	{
mbed_official	0:51ac1d130fd4	280	if (pcb->state == LISTEN) {
mbed_official	0:51ac1d130fd4	281	return ERR_CONN;
mbed_official	0:51ac1d130fd4	282	}
mbed_official	0:51ac1d130fd4	283	if (shut_rx) {
mbed_official	0:51ac1d130fd4	284	/* shut down the receive side: free buffered data... */
mbed_official	0:51ac1d130fd4	285	if (pcb->refused_data != NULL) {
mbed_official	0:51ac1d130fd4	286	pbuf_free(pcb->refused_data);
mbed_official	0:51ac1d130fd4	287	pcb->refused_data = NULL;
mbed_official	0:51ac1d130fd4	288	}
mbed_official	0:51ac1d130fd4	289	/* ... and set a flag not to receive any more data */
mbed_official	0:51ac1d130fd4	290	pcb->flags \|= TF_RXCLOSED;
mbed_official	0:51ac1d130fd4	291	}
mbed_official	0:51ac1d130fd4	292	if (shut_tx) {
mbed_official	0:51ac1d130fd4	293	/* This can't happen twice since if it succeeds, the pcb's state is changed.
mbed_official	0:51ac1d130fd4	294	Only close in these states as the others directly deallocate the PCB */
mbed_official	0:51ac1d130fd4	295	switch (pcb->state) {
mbed_official	0:51ac1d130fd4	296	case SYN_RCVD:
mbed_official	0:51ac1d130fd4	297	case ESTABLISHED:
mbed_official	0:51ac1d130fd4	298	case CLOSE_WAIT:
mbed_official	0:51ac1d130fd4	299	return tcp_close_shutdown(pcb, 0);
mbed_official	0:51ac1d130fd4	300	default:
mbed_official	0:51ac1d130fd4	301	/* don't shut down other states */
mbed_official	0:51ac1d130fd4	302	break;
mbed_official	0:51ac1d130fd4	303	}
mbed_official	0:51ac1d130fd4	304	}
mbed_official	0:51ac1d130fd4	305	/* @todo: return another err_t if not in correct state or already shut? */
mbed_official	0:51ac1d130fd4	306	return ERR_OK;
mbed_official	0:51ac1d130fd4	307	}
mbed_official	0:51ac1d130fd4	308
mbed_official	0:51ac1d130fd4	309	/**
mbed_official	0:51ac1d130fd4	310	* Abandons a connection and optionally sends a RST to the remote
mbed_official	0:51ac1d130fd4	311	* host. Deletes the local protocol control block. This is done when
mbed_official	0:51ac1d130fd4	312	* a connection is killed because of shortage of memory.
mbed_official	0:51ac1d130fd4	313	*
mbed_official	0:51ac1d130fd4	314	* @param pcb the tcp_pcb to abort
mbed_official	0:51ac1d130fd4	315	* @param reset boolean to indicate whether a reset should be sent
mbed_official	0:51ac1d130fd4	316	*/
mbed_official	0:51ac1d130fd4	317	void
mbed_official	0:51ac1d130fd4	318	tcp_abandon(struct tcp_pcb *pcb, int reset)
mbed_official	0:51ac1d130fd4	319	{
mbed_official	0:51ac1d130fd4	320	u32_t seqno, ackno;
mbed_official	0:51ac1d130fd4	321	u16_t remote_port, local_port;
mbed_official	0:51ac1d130fd4	322	ip_addr_t remote_ip, local_ip;
mbed_official	0:51ac1d130fd4	323	#if LWIP_CALLBACK_API
mbed_official	0:51ac1d130fd4	324	tcp_err_fn errf;
mbed_official	0:51ac1d130fd4	325	#endif /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	326	void *errf_arg;
mbed_official	0:51ac1d130fd4	327
mbed_official	0:51ac1d130fd4	328	/* pcb->state LISTEN not allowed here */
mbed_official	0:51ac1d130fd4	329	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
mbed_official	0:51ac1d130fd4	330	pcb->state != LISTEN);
mbed_official	0:51ac1d130fd4	331	/* Figure out on which TCP PCB list we are, and remove us. If we
mbed_official	0:51ac1d130fd4	332	are in an active state, call the receive function associated with
mbed_official	0:51ac1d130fd4	333	the PCB with a NULL argument, and send an RST to the remote end. */
mbed_official	0:51ac1d130fd4	334	if (pcb->state == TIME_WAIT) {
mbed_official	0:51ac1d130fd4	335	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
mbed_official	0:51ac1d130fd4	336	memp_free(MEMP_TCP_PCB, pcb);
mbed_official	0:51ac1d130fd4	337	} else {
mbed_official	0:51ac1d130fd4	338	seqno = pcb->snd_nxt;
mbed_official	0:51ac1d130fd4	339	ackno = pcb->rcv_nxt;
mbed_official	0:51ac1d130fd4	340	ip_addr_copy(local_ip, pcb->local_ip);
mbed_official	0:51ac1d130fd4	341	ip_addr_copy(remote_ip, pcb->remote_ip);
mbed_official	0:51ac1d130fd4	342	local_port = pcb->local_port;
mbed_official	0:51ac1d130fd4	343	remote_port = pcb->remote_port;
mbed_official	0:51ac1d130fd4	344	#if LWIP_CALLBACK_API
mbed_official	0:51ac1d130fd4	345	errf = pcb->errf;
mbed_official	0:51ac1d130fd4	346	#endif /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	347	errf_arg = pcb->callback_arg;
mbed_official	0:51ac1d130fd4	348	tcp_pcb_remove(&tcp_active_pcbs, pcb);
mbed_official	0:51ac1d130fd4	349	if (pcb->unacked != NULL) {
mbed_official	0:51ac1d130fd4	350	tcp_segs_free(pcb->unacked);
mbed_official	0:51ac1d130fd4	351	}
mbed_official	0:51ac1d130fd4	352	if (pcb->unsent != NULL) {
mbed_official	0:51ac1d130fd4	353	tcp_segs_free(pcb->unsent);
mbed_official	0:51ac1d130fd4	354	}
mbed_official	0:51ac1d130fd4	355	#if TCP_QUEUE_OOSEQ
mbed_official	0:51ac1d130fd4	356	if (pcb->ooseq != NULL) {
mbed_official	0:51ac1d130fd4	357	tcp_segs_free(pcb->ooseq);
mbed_official	0:51ac1d130fd4	358	}
mbed_official	0:51ac1d130fd4	359	#endif /* TCP_QUEUE_OOSEQ */
mbed_official	0:51ac1d130fd4	360	memp_free(MEMP_TCP_PCB, pcb);
mbed_official	0:51ac1d130fd4	361	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
mbed_official	0:51ac1d130fd4	362	if (reset) {
mbed_official	0:51ac1d130fd4	363	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
mbed_official	0:51ac1d130fd4	364	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
mbed_official	0:51ac1d130fd4	365	}
mbed_official	0:51ac1d130fd4	366	}
mbed_official	0:51ac1d130fd4	367	}
mbed_official	0:51ac1d130fd4	368
mbed_official	0:51ac1d130fd4	369	/**
mbed_official	0:51ac1d130fd4	370	* Aborts the connection by sending a RST (reset) segment to the remote
mbed_official	0:51ac1d130fd4	371	* host. The pcb is deallocated. This function never fails.
mbed_official	0:51ac1d130fd4	372	*
mbed_official	0:51ac1d130fd4	373	* ATTENTION: When calling this from one of the TCP callbacks, make
mbed_official	0:51ac1d130fd4	374	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
mbed_official	0:51ac1d130fd4	375	* or you will risk accessing deallocated memory or memory leaks!
mbed_official	0:51ac1d130fd4	376	*
mbed_official	0:51ac1d130fd4	377	* @param pcb the tcp pcb to abort
mbed_official	0:51ac1d130fd4	378	*/
mbed_official	0:51ac1d130fd4	379	void
mbed_official	0:51ac1d130fd4	380	tcp_abort(struct tcp_pcb *pcb)
mbed_official	0:51ac1d130fd4	381	{
mbed_official	0:51ac1d130fd4	382	tcp_abandon(pcb, 1);
mbed_official	0:51ac1d130fd4	383	}
mbed_official	0:51ac1d130fd4	384
mbed_official	0:51ac1d130fd4	385	/**
mbed_official	0:51ac1d130fd4	386	* Binds the connection to a local portnumber and IP address. If the
mbed_official	0:51ac1d130fd4	387	* IP address is not given (i.e., ipaddr == NULL), the IP address of
mbed_official	0:51ac1d130fd4	388	* the outgoing network interface is used instead.
mbed_official	0:51ac1d130fd4	389	*
mbed_official	0:51ac1d130fd4	390	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
mbed_official	0:51ac1d130fd4	391	* already bound!)
mbed_official	0:51ac1d130fd4	392	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
mbed_official	0:51ac1d130fd4	393	* to any local address
mbed_official	0:51ac1d130fd4	394	* @param port the local port to bind to
mbed_official	0:51ac1d130fd4	395	* @return ERR_USE if the port is already in use
mbed_official	0:51ac1d130fd4	396	* ERR_VAL if bind failed because the PCB is not in a valid state
mbed_official	0:51ac1d130fd4	397	* ERR_OK if bound
mbed_official	0:51ac1d130fd4	398	*/
mbed_official	0:51ac1d130fd4	399	err_t
mbed_official	0:51ac1d130fd4	400	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
mbed_official	0:51ac1d130fd4	401	{
mbed_official	0:51ac1d130fd4	402	int i;
mbed_official	0:51ac1d130fd4	403	int max_pcb_list = NUM_TCP_PCB_LISTS;
mbed_official	0:51ac1d130fd4	404	struct tcp_pcb *cpcb;
mbed_official	0:51ac1d130fd4	405
mbed_official	0:51ac1d130fd4	406	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
mbed_official	0:51ac1d130fd4	407
mbed_official	0:51ac1d130fd4	408	#if SO_REUSE
mbed_official	0:51ac1d130fd4	409	/* Unless the REUSEADDR flag is set,
mbed_official	0:51ac1d130fd4	410	we have to check the pcbs in TIME-WAIT state, also.
mbed_official	0:51ac1d130fd4	411	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
mbed_official	0:51ac1d130fd4	412	packets using both local and remote IP addresses and ports to distinguish.
mbed_official	0:51ac1d130fd4	413	*/
mbed_official	0:51ac1d130fd4	414	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mbed_official	0:51ac1d130fd4	415	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
mbed_official	0:51ac1d130fd4	416	}
mbed_official	0:51ac1d130fd4	417	#endif /* SO_REUSE */
mbed_official	0:51ac1d130fd4	418
mbed_official	0:51ac1d130fd4	419	if (port == 0) {
mbed_official	0:51ac1d130fd4	420	port = tcp_new_port();
mbed_official	0:51ac1d130fd4	421	}
mbed_official	0:51ac1d130fd4	422
mbed_official	0:51ac1d130fd4	423	/* Check if the address already is in use (on all lists) */
mbed_official	0:51ac1d130fd4	424	for (i = 0; i < max_pcb_list; i++) {
mbed_official	0:51ac1d130fd4	425	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
mbed_official	0:51ac1d130fd4	426	if (cpcb->local_port == port) {
mbed_official	0:51ac1d130fd4	427	#if SO_REUSE
mbed_official	0:51ac1d130fd4	428	/* Omit checking for the same port if both pcbs have REUSEADDR set.
mbed_official	0:51ac1d130fd4	429	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
mbed_official	0:51ac1d130fd4	430	tcp_connect. */
mbed_official	0:51ac1d130fd4	431	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
mbed_official	0:51ac1d130fd4	432	((cpcb->so_options & SOF_REUSEADDR) == 0))
mbed_official	0:51ac1d130fd4	433	#endif /* SO_REUSE */
mbed_official	0:51ac1d130fd4	434	{
mbed_official	0:51ac1d130fd4	435	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
mbed_official	0:51ac1d130fd4	436	ip_addr_isany(ipaddr) \|\|
mbed_official	0:51ac1d130fd4	437	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
mbed_official	0:51ac1d130fd4	438	return ERR_USE;
mbed_official	0:51ac1d130fd4	439	}
mbed_official	0:51ac1d130fd4	440	}
mbed_official	0:51ac1d130fd4	441	}
mbed_official	0:51ac1d130fd4	442	}
mbed_official	0:51ac1d130fd4	443	}
mbed_official	0:51ac1d130fd4	444
mbed_official	0:51ac1d130fd4	445	if (!ip_addr_isany(ipaddr)) {
mbed_official	0:51ac1d130fd4	446	pcb->local_ip = *ipaddr;
mbed_official	0:51ac1d130fd4	447	}
mbed_official	0:51ac1d130fd4	448	pcb->local_port = port;
mbed_official	0:51ac1d130fd4	449	TCP_REG(&tcp_bound_pcbs, pcb);
mbed_official	0:51ac1d130fd4	450	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
mbed_official	0:51ac1d130fd4	451	return ERR_OK;
mbed_official	0:51ac1d130fd4	452	}
mbed_official	0:51ac1d130fd4	453	#if LWIP_CALLBACK_API
mbed_official	0:51ac1d130fd4	454	/**
mbed_official	0:51ac1d130fd4	455	* Default accept callback if no accept callback is specified by the user.
mbed_official	0:51ac1d130fd4	456	*/
mbed_official	0:51ac1d130fd4	457	static err_t
mbed_official	0:51ac1d130fd4	458	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
mbed_official	0:51ac1d130fd4	459	{
mbed_official	0:51ac1d130fd4	460	LWIP_UNUSED_ARG(arg);
mbed_official	0:51ac1d130fd4	461	LWIP_UNUSED_ARG(pcb);
mbed_official	0:51ac1d130fd4	462	LWIP_UNUSED_ARG(err);
mbed_official	0:51ac1d130fd4	463
mbed_official	0:51ac1d130fd4	464	return ERR_ABRT;
mbed_official	0:51ac1d130fd4	465	}
mbed_official	0:51ac1d130fd4	466	#endif /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	467
mbed_official	0:51ac1d130fd4	468	/**
mbed_official	0:51ac1d130fd4	469	* Set the state of the connection to be LISTEN, which means that it
mbed_official	0:51ac1d130fd4	470	* is able to accept incoming connections. The protocol control block
mbed_official	0:51ac1d130fd4	471	* is reallocated in order to consume less memory. Setting the
mbed_official	0:51ac1d130fd4	472	* connection to LISTEN is an irreversible process.
mbed_official	0:51ac1d130fd4	473	*
mbed_official	0:51ac1d130fd4	474	* @param pcb the original tcp_pcb
mbed_official	0:51ac1d130fd4	475	* @param backlog the incoming connections queue limit
mbed_official	0:51ac1d130fd4	476	* @return tcp_pcb used for listening, consumes less memory.
mbed_official	0:51ac1d130fd4	477	*
mbed_official	0:51ac1d130fd4	478	* @note The original tcp_pcb is freed. This function therefore has to be
mbed_official	0:51ac1d130fd4	479	* called like this:
mbed_official	0:51ac1d130fd4	480	* tpcb = tcp_listen(tpcb);
mbed_official	0:51ac1d130fd4	481	*/
mbed_official	0:51ac1d130fd4	482	struct tcp_pcb *
mbed_official	0:51ac1d130fd4	483	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
mbed_official	0:51ac1d130fd4	484	{
mbed_official	0:51ac1d130fd4	485	struct tcp_pcb_listen *lpcb;
mbed_official	0:51ac1d130fd4	486
mbed_official	0:51ac1d130fd4	487	LWIP_UNUSED_ARG(backlog);
mbed_official	0:51ac1d130fd4	488	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
mbed_official	0:51ac1d130fd4	489
mbed_official	0:51ac1d130fd4	490	/* already listening? */
mbed_official	0:51ac1d130fd4	491	if (pcb->state == LISTEN) {
mbed_official	0:51ac1d130fd4	492	return pcb;
mbed_official	0:51ac1d130fd4	493	}
mbed_official	0:51ac1d130fd4	494	#if SO_REUSE
mbed_official	0:51ac1d130fd4	495	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mbed_official	0:51ac1d130fd4	496	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
mbed_official	0:51ac1d130fd4	497	is declared (listen-/connection-pcb), we have to make sure now that
mbed_official	0:51ac1d130fd4	498	this port is only used once for every local IP. */
mbed_official	0:51ac1d130fd4	499	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
mbed_official	0:51ac1d130fd4	500	if (lpcb->local_port == pcb->local_port) {
mbed_official	0:51ac1d130fd4	501	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
mbed_official	0:51ac1d130fd4	502	/* this address/port is already used */
mbed_official	0:51ac1d130fd4	503	return NULL;
mbed_official	0:51ac1d130fd4	504	}
mbed_official	0:51ac1d130fd4	505	}
mbed_official	0:51ac1d130fd4	506	}
mbed_official	0:51ac1d130fd4	507	}
mbed_official	0:51ac1d130fd4	508	#endif /* SO_REUSE */
mbed_official	0:51ac1d130fd4	509	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
mbed_official	0:51ac1d130fd4	510	if (lpcb == NULL) {
mbed_official	0:51ac1d130fd4	511	return NULL;
mbed_official	0:51ac1d130fd4	512	}
mbed_official	0:51ac1d130fd4	513	lpcb->callback_arg = pcb->callback_arg;
mbed_official	0:51ac1d130fd4	514	lpcb->local_port = pcb->local_port;
mbed_official	0:51ac1d130fd4	515	lpcb->state = LISTEN;
mbed_official	0:51ac1d130fd4	516	lpcb->prio = pcb->prio;
mbed_official	0:51ac1d130fd4	517	lpcb->so_options = pcb->so_options;
mbed_official	0:51ac1d130fd4	518	lpcb->so_options \|= SOF_ACCEPTCONN;
mbed_official	0:51ac1d130fd4	519	lpcb->ttl = pcb->ttl;
mbed_official	0:51ac1d130fd4	520	lpcb->tos = pcb->tos;
mbed_official	0:51ac1d130fd4	521	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
mbed_official	0:51ac1d130fd4	522	if (pcb->local_port != 0) {
mbed_official	0:51ac1d130fd4	523	TCP_RMV(&tcp_bound_pcbs, pcb);
mbed_official	0:51ac1d130fd4	524	}
mbed_official	0:51ac1d130fd4	525	memp_free(MEMP_TCP_PCB, pcb);
mbed_official	0:51ac1d130fd4	526	#if LWIP_CALLBACK_API
mbed_official	0:51ac1d130fd4	527	lpcb->accept = tcp_accept_null;
mbed_official	0:51ac1d130fd4	528	#endif /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	529	#if TCP_LISTEN_BACKLOG
mbed_official	0:51ac1d130fd4	530	lpcb->accepts_pending = 0;
mbed_official	0:51ac1d130fd4	531	lpcb->backlog = (backlog ? backlog : 1);
mbed_official	0:51ac1d130fd4	532	#endif /* TCP_LISTEN_BACKLOG */
mbed_official	0:51ac1d130fd4	533	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
mbed_official	0:51ac1d130fd4	534	return (struct tcp_pcb *)lpcb;
mbed_official	0:51ac1d130fd4	535	}
mbed_official	0:51ac1d130fd4	536
mbed_official	0:51ac1d130fd4	537	/**
mbed_official	0:51ac1d130fd4	538	* Update the state that tracks the available window space to advertise.
mbed_official	0:51ac1d130fd4	539	*
mbed_official	0:51ac1d130fd4	540	* Returns how much extra window would be advertised if we sent an
mbed_official	0:51ac1d130fd4	541	* update now.
mbed_official	0:51ac1d130fd4	542	*/
mbed_official	0:51ac1d130fd4	543	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
mbed_official	0:51ac1d130fd4	544	{
mbed_official	0:51ac1d130fd4	545	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
mbed_official	0:51ac1d130fd4	546
mbed_official	0:51ac1d130fd4	547	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
mbed_official	0:51ac1d130fd4	548	/* we can advertise more window */
mbed_official	0:51ac1d130fd4	549	pcb->rcv_ann_wnd = pcb->rcv_wnd;
mbed_official	0:51ac1d130fd4	550	return new_right_edge - pcb->rcv_ann_right_edge;
mbed_official	0:51ac1d130fd4	551	} else {
mbed_official	0:51ac1d130fd4	552	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
mbed_official	0:51ac1d130fd4	553	/* Can happen due to other end sending out of advertised window,
mbed_official	0:51ac1d130fd4	554	* but within actual available (but not yet advertised) window */
mbed_official	0:51ac1d130fd4	555	pcb->rcv_ann_wnd = 0;
mbed_official	0:51ac1d130fd4	556	} else {
mbed_official	0:51ac1d130fd4	557	/* keep the right edge of window constant */
mbed_official	0:51ac1d130fd4	558	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
mbed_official	0:51ac1d130fd4	559	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
mbed_official	0:51ac1d130fd4	560	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
mbed_official	0:51ac1d130fd4	561	}
mbed_official	0:51ac1d130fd4	562	return 0;
mbed_official	0:51ac1d130fd4	563	}
mbed_official	0:51ac1d130fd4	564	}
mbed_official	0:51ac1d130fd4	565
mbed_official	0:51ac1d130fd4	566	/**
mbed_official	0:51ac1d130fd4	567	* This function should be called by the application when it has
mbed_official	0:51ac1d130fd4	568	* processed the data. The purpose is to advertise a larger window
mbed_official	0:51ac1d130fd4	569	* when the data has been processed.
mbed_official	0:51ac1d130fd4	570	*
mbed_official	0:51ac1d130fd4	571	* @param pcb the tcp_pcb for which data is read
mbed_official	0:51ac1d130fd4	572	* @param len the amount of bytes that have been read by the application
mbed_official	0:51ac1d130fd4	573	*/
mbed_official	0:51ac1d130fd4	574	void
mbed_official	0:51ac1d130fd4	575	tcp_recved(struct tcp_pcb *pcb, u16_t len)
mbed_official	0:51ac1d130fd4	576	{
mbed_official	0:51ac1d130fd4	577	int wnd_inflation;
mbed_official	0:51ac1d130fd4	578
mbed_official	0:51ac1d130fd4	579	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
mbed_official	0:51ac1d130fd4	580	len <= 0xffff - pcb->rcv_wnd );
mbed_official	0:51ac1d130fd4	581
mbed_official	0:51ac1d130fd4	582	pcb->rcv_wnd += len;
mbed_official	0:51ac1d130fd4	583	if (pcb->rcv_wnd > TCP_WND) {
mbed_official	0:51ac1d130fd4	584	pcb->rcv_wnd = TCP_WND;
mbed_official	0:51ac1d130fd4	585	}
mbed_official	0:51ac1d130fd4	586
mbed_official	0:51ac1d130fd4	587	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
mbed_official	0:51ac1d130fd4	588
mbed_official	0:51ac1d130fd4	589	/* If the change in the right edge of window is significant (default
mbed_official	0:51ac1d130fd4	590	* watermark is TCP_WND/4), then send an explicit update now.
mbed_official	0:51ac1d130fd4	591	* Otherwise wait for a packet to be sent in the normal course of
mbed_official	0:51ac1d130fd4	592	* events (or more window to be available later) */
mbed_official	0:51ac1d130fd4	593	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
mbed_official	0:51ac1d130fd4	594	tcp_ack_now(pcb);
mbed_official	0:51ac1d130fd4	595	tcp_output(pcb);
mbed_official	0:51ac1d130fd4	596	}
mbed_official	0:51ac1d130fd4	597
mbed_official	0:51ac1d130fd4	598	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
mbed_official	0:51ac1d130fd4	599	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
mbed_official	0:51ac1d130fd4	600	}
mbed_official	0:51ac1d130fd4	601
mbed_official	0:51ac1d130fd4	602	/**
mbed_official	0:51ac1d130fd4	603	* A nastly hack featuring 'goto' statements that allocates a
mbed_official	0:51ac1d130fd4	604	* new TCP local port.
mbed_official	0:51ac1d130fd4	605	*
mbed_official	0:51ac1d130fd4	606	* @return a new (free) local TCP port number
mbed_official	0:51ac1d130fd4	607	*/
mbed_official	0:51ac1d130fd4	608	static u16_t
mbed_official	0:51ac1d130fd4	609	tcp_new_port(void)
mbed_official	0:51ac1d130fd4	610	{
mbed_official	0:51ac1d130fd4	611	int i;
mbed_official	0:51ac1d130fd4	612	struct tcp_pcb *pcb;
mbed_official	0:51ac1d130fd4	613	#ifndef TCP_LOCAL_PORT_RANGE_START
mbed_official	0:51ac1d130fd4	614	/* From http://www.iana.org/assignments/port-numbers:
mbed_official	0:51ac1d130fd4	615	"The Dynamic and/or Private Ports are those from 49152 through 65535" */
mbed_official	0:51ac1d130fd4	616	#define TCP_LOCAL_PORT_RANGE_START 0xc000
mbed_official	0:51ac1d130fd4	617	#define TCP_LOCAL_PORT_RANGE_END 0xffff
mbed_official	0:51ac1d130fd4	618	#endif
mbed_official	0:51ac1d130fd4	619	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
mbed_official	0:51ac1d130fd4	620
mbed_official	0:51ac1d130fd4	621	again:
mbed_official	0:51ac1d130fd4	622	if (port++ >= TCP_LOCAL_PORT_RANGE_END) {
mbed_official	0:51ac1d130fd4	623	port = TCP_LOCAL_PORT_RANGE_START;
mbed_official	0:51ac1d130fd4	624	}
mbed_official	0:51ac1d130fd4	625	/* Check all PCB lists. */
mbed_official	0:51ac1d130fd4	626	for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
mbed_official	0:51ac1d130fd4	627	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
mbed_official	0:51ac1d130fd4	628	if (pcb->local_port == port) {
mbed_official	0:51ac1d130fd4	629	goto again;
mbed_official	0:51ac1d130fd4	630	}
mbed_official	0:51ac1d130fd4	631	}
mbed_official	0:51ac1d130fd4	632	}
mbed_official	0:51ac1d130fd4	633	return port;
mbed_official	0:51ac1d130fd4	634	}
mbed_official	0:51ac1d130fd4	635
mbed_official	0:51ac1d130fd4	636	/**
mbed_official	0:51ac1d130fd4	637	* Connects to another host. The function given as the "connected"
mbed_official	0:51ac1d130fd4	638	* argument will be called when the connection has been established.
mbed_official	0:51ac1d130fd4	639	*
mbed_official	0:51ac1d130fd4	640	* @param pcb the tcp_pcb used to establish the connection
mbed_official	0:51ac1d130fd4	641	* @param ipaddr the remote ip address to connect to
mbed_official	0:51ac1d130fd4	642	* @param port the remote tcp port to connect to
mbed_official	0:51ac1d130fd4	643	* @param connected callback function to call when connected (or on error)
mbed_official	0:51ac1d130fd4	644	* @return ERR_VAL if invalid arguments are given
mbed_official	0:51ac1d130fd4	645	* ERR_OK if connect request has been sent
mbed_official	0:51ac1d130fd4	646	* other err_t values if connect request couldn't be sent
mbed_official	0:51ac1d130fd4	647	*/
mbed_official	0:51ac1d130fd4	648	err_t
mbed_official	0:51ac1d130fd4	649	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
mbed_official	0:51ac1d130fd4	650	tcp_connected_fn connected)
mbed_official	0:51ac1d130fd4	651	{
mbed_official	0:51ac1d130fd4	652	err_t ret;
mbed_official	0:51ac1d130fd4	653	u32_t iss;
mbed_official	0:51ac1d130fd4	654	u16_t old_local_port;
mbed_official	0:51ac1d130fd4	655
mbed_official	0:51ac1d130fd4	656	LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
mbed_official	0:51ac1d130fd4	657
mbed_official	0:51ac1d130fd4	658	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
mbed_official	0:51ac1d130fd4	659	if (ipaddr != NULL) {
mbed_official	0:51ac1d130fd4	660	pcb->remote_ip = *ipaddr;
mbed_official	0:51ac1d130fd4	661	} else {
mbed_official	0:51ac1d130fd4	662	return ERR_VAL;
mbed_official	0:51ac1d130fd4	663	}
mbed_official	0:51ac1d130fd4	664	pcb->remote_port = port;
mbed_official	0:51ac1d130fd4	665
mbed_official	0:51ac1d130fd4	666	/* check if we have a route to the remote host */
mbed_official	0:51ac1d130fd4	667	if (ip_addr_isany(&(pcb->local_ip))) {
mbed_official	0:51ac1d130fd4	668	/* no local IP address set, yet. */
mbed_official	0:51ac1d130fd4	669	struct netif *netif = ip_route(&(pcb->remote_ip));
mbed_official	0:51ac1d130fd4	670	if (netif == NULL) {
mbed_official	0:51ac1d130fd4	671	/* Don't even try to send a SYN packet if we have no route
mbed_official	0:51ac1d130fd4	672	since that will fail. */
mbed_official	0:51ac1d130fd4	673	return ERR_RTE;
mbed_official	0:51ac1d130fd4	674	}
mbed_official	0:51ac1d130fd4	675	/* Use the netif's IP address as local address. */
mbed_official	0:51ac1d130fd4	676	ip_addr_copy(pcb->local_ip, netif->ip_addr);
mbed_official	0:51ac1d130fd4	677	}
mbed_official	0:51ac1d130fd4	678
mbed_official	0:51ac1d130fd4	679	old_local_port = pcb->local_port;
mbed_official	0:51ac1d130fd4	680	if (pcb->local_port == 0) {
mbed_official	0:51ac1d130fd4	681	pcb->local_port = tcp_new_port();
mbed_official	0:51ac1d130fd4	682	}
mbed_official	0:51ac1d130fd4	683	#if SO_REUSE
mbed_official	0:51ac1d130fd4	684	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mbed_official	0:51ac1d130fd4	685	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
mbed_official	0:51ac1d130fd4	686	now that the 5-tuple is unique. */
mbed_official	0:51ac1d130fd4	687	struct tcp_pcb *cpcb;
mbed_official	0:51ac1d130fd4	688	int i;
mbed_official	0:51ac1d130fd4	689	/* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
mbed_official	0:51ac1d130fd4	690	for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
mbed_official	0:51ac1d130fd4	691	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
mbed_official	0:51ac1d130fd4	692	if ((cpcb->local_port == pcb->local_port) &&
mbed_official	0:51ac1d130fd4	693	(cpcb->remote_port == port) &&
mbed_official	0:51ac1d130fd4	694	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
mbed_official	0:51ac1d130fd4	695	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
mbed_official	0:51ac1d130fd4	696	/* linux returns EISCONN here, but ERR_USE should be OK for us */
mbed_official	0:51ac1d130fd4	697	return ERR_USE;
mbed_official	0:51ac1d130fd4	698	}
mbed_official	0:51ac1d130fd4	699	}
mbed_official	0:51ac1d130fd4	700	}
mbed_official	0:51ac1d130fd4	701	}
mbed_official	0:51ac1d130fd4	702	#endif /* SO_REUSE */
mbed_official	0:51ac1d130fd4	703	iss = tcp_next_iss();
mbed_official	0:51ac1d130fd4	704	pcb->rcv_nxt = 0;
mbed_official	0:51ac1d130fd4	705	pcb->snd_nxt = iss;
mbed_official	0:51ac1d130fd4	706	pcb->lastack = iss - 1;
mbed_official	0:51ac1d130fd4	707	pcb->snd_lbb = iss - 1;
mbed_official	0:51ac1d130fd4	708	pcb->rcv_wnd = TCP_WND;
mbed_official	0:51ac1d130fd4	709	pcb->rcv_ann_wnd = TCP_WND;
mbed_official	0:51ac1d130fd4	710	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
mbed_official	0:51ac1d130fd4	711	pcb->snd_wnd = TCP_WND;
mbed_official	0:51ac1d130fd4	712	/* As initial send MSS, we use TCP_MSS but limit it to 536.
mbed_official	0:51ac1d130fd4	713	The send MSS is updated when an MSS option is received. */
mbed_official	0:51ac1d130fd4	714	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
mbed_official	0:51ac1d130fd4	715	#if TCP_CALCULATE_EFF_SEND_MSS
mbed_official	0:51ac1d130fd4	716	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
mbed_official	0:51ac1d130fd4	717	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
mbed_official	0:51ac1d130fd4	718	pcb->cwnd = 1;
mbed_official	0:51ac1d130fd4	719	pcb->ssthresh = pcb->mss * 10;
mbed_official	0:51ac1d130fd4	720	#if LWIP_CALLBACK_API
mbed_official	0:51ac1d130fd4	721	pcb->connected = connected;
mbed_official	0:51ac1d130fd4	722	#else /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	723	LWIP_UNUSED_ARG(connected);
mbed_official	0:51ac1d130fd4	724	#endif /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	725
mbed_official	0:51ac1d130fd4	726	/* Send a SYN together with the MSS option. */
mbed_official	0:51ac1d130fd4	727	ret = tcp_enqueue_flags(pcb, TCP_SYN);
mbed_official	0:51ac1d130fd4	728	if (ret == ERR_OK) {
mbed_official	0:51ac1d130fd4	729	/* SYN segment was enqueued, changed the pcbs state now */
mbed_official	0:51ac1d130fd4	730	pcb->state = SYN_SENT;
mbed_official	0:51ac1d130fd4	731	if (old_local_port != 0) {
mbed_official	0:51ac1d130fd4	732	TCP_RMV(&tcp_bound_pcbs, pcb);
mbed_official	0:51ac1d130fd4	733	}
mbed_official	0:51ac1d130fd4	734	TCP_REG(&tcp_active_pcbs, pcb);
mbed_official	0:51ac1d130fd4	735	snmp_inc_tcpactiveopens();
mbed_official	0:51ac1d130fd4	736
mbed_official	0:51ac1d130fd4	737	tcp_output(pcb);
mbed_official	0:51ac1d130fd4	738	}
mbed_official	0:51ac1d130fd4	739	return ret;
mbed_official	0:51ac1d130fd4	740	}
mbed_official	0:51ac1d130fd4	741
mbed_official	0:51ac1d130fd4	742	/**
mbed_official	0:51ac1d130fd4	743	* Called every 500 ms and implements the retransmission timer and the timer that
mbed_official	0:51ac1d130fd4	744	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
mbed_official	0:51ac1d130fd4	745	* various timers such as the inactivity timer in each PCB.
mbed_official	0:51ac1d130fd4	746	*
mbed_official	0:51ac1d130fd4	747	* Automatically called from tcp_tmr().
mbed_official	0:51ac1d130fd4	748	*/
mbed_official	0:51ac1d130fd4	749	void
mbed_official	0:51ac1d130fd4	750	tcp_slowtmr(void)
mbed_official	0:51ac1d130fd4	751	{
mbed_official	0:51ac1d130fd4	752	struct tcp_pcb pcb, prev;
mbed_official	0:51ac1d130fd4	753	u16_t eff_wnd;
mbed_official	0:51ac1d130fd4	754	u8_t pcb_remove; /* flag if a PCB should be removed */
mbed_official	0:51ac1d130fd4	755	u8_t pcb_reset; /* flag if a RST should be sent when removing */
mbed_official	0:51ac1d130fd4	756	err_t err;
mbed_official	0:51ac1d130fd4	757
mbed_official	0:51ac1d130fd4	758	err = ERR_OK;
mbed_official	0:51ac1d130fd4	759
mbed_official	0:51ac1d130fd4	760	++tcp_ticks;
mbed_official	0:51ac1d130fd4	761
mbed_official	0:51ac1d130fd4	762	/* Steps through all of the active PCBs. */
mbed_official	0:51ac1d130fd4	763	prev = NULL;
mbed_official	0:51ac1d130fd4	764	pcb = tcp_active_pcbs;
mbed_official	0:51ac1d130fd4	765	if (pcb == NULL) {
mbed_official	0:51ac1d130fd4	766	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
mbed_official	0:51ac1d130fd4	767	}
mbed_official	0:51ac1d130fd4	768	while (pcb != NULL) {
mbed_official	0:51ac1d130fd4	769	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
mbed_official	0:51ac1d130fd4	770	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
mbed_official	0:51ac1d130fd4	771	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
mbed_official	0:51ac1d130fd4	772	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
mbed_official	0:51ac1d130fd4	773
mbed_official	0:51ac1d130fd4	774	pcb_remove = 0;
mbed_official	0:51ac1d130fd4	775	pcb_reset = 0;
mbed_official	0:51ac1d130fd4	776
mbed_official	0:51ac1d130fd4	777	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
mbed_official	0:51ac1d130fd4	778	++pcb_remove;
mbed_official	0:51ac1d130fd4	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
mbed_official	0:51ac1d130fd4	780	}
mbed_official	0:51ac1d130fd4	781	else if (pcb->nrtx == TCP_MAXRTX) {
mbed_official	0:51ac1d130fd4	782	++pcb_remove;
mbed_official	0:51ac1d130fd4	783	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
mbed_official	0:51ac1d130fd4	784	} else {
mbed_official	0:51ac1d130fd4	785	if (pcb->persist_backoff > 0) {
mbed_official	0:51ac1d130fd4	786	/* If snd_wnd is zero, use persist timer to send 1 byte probes
mbed_official	0:51ac1d130fd4	787	* instead of using the standard retransmission mechanism. */
mbed_official	0:51ac1d130fd4	788	pcb->persist_cnt++;
mbed_official	0:51ac1d130fd4	789	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
mbed_official	0:51ac1d130fd4	790	pcb->persist_cnt = 0;
mbed_official	0:51ac1d130fd4	791	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
mbed_official	0:51ac1d130fd4	792	pcb->persist_backoff++;
mbed_official	0:51ac1d130fd4	793	}
mbed_official	0:51ac1d130fd4	794	tcp_zero_window_probe(pcb);
mbed_official	0:51ac1d130fd4	795	}
mbed_official	0:51ac1d130fd4	796	} else {
mbed_official	0:51ac1d130fd4	797	/* Increase the retransmission timer if it is running */
mbed_official	0:51ac1d130fd4	798	if(pcb->rtime >= 0)
mbed_official	0:51ac1d130fd4	799	++pcb->rtime;
mbed_official	0:51ac1d130fd4	800
mbed_official	0:51ac1d130fd4	801	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
mbed_official	0:51ac1d130fd4	802	/* Time for a retransmission. */
mbed_official	0:51ac1d130fd4	803	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
mbed_official	0:51ac1d130fd4	804	" pcb->rto %"S16_F"\n",
mbed_official	0:51ac1d130fd4	805	pcb->rtime, pcb->rto));
mbed_official	0:51ac1d130fd4	806
mbed_official	0:51ac1d130fd4	807	/* Double retransmission time-out unless we are trying to
mbed_official	0:51ac1d130fd4	808	* connect to somebody (i.e., we are in SYN_SENT). */
mbed_official	0:51ac1d130fd4	809	if (pcb->state != SYN_SENT) {
mbed_official	0:51ac1d130fd4	810	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
mbed_official	0:51ac1d130fd4	811	}
mbed_official	0:51ac1d130fd4	812
mbed_official	0:51ac1d130fd4	813	/* Reset the retransmission timer. */
mbed_official	0:51ac1d130fd4	814	pcb->rtime = 0;
mbed_official	0:51ac1d130fd4	815
mbed_official	0:51ac1d130fd4	816	/* Reduce congestion window and ssthresh. */
mbed_official	0:51ac1d130fd4	817	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
mbed_official	0:51ac1d130fd4	818	pcb->ssthresh = eff_wnd >> 1;
mbed_official	0:51ac1d130fd4	819	if (pcb->ssthresh < (pcb->mss << 1)) {
mbed_official	0:51ac1d130fd4	820	pcb->ssthresh = (pcb->mss << 1);
mbed_official	0:51ac1d130fd4	821	}
mbed_official	0:51ac1d130fd4	822	pcb->cwnd = pcb->mss;
mbed_official	0:51ac1d130fd4	823	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
mbed_official	0:51ac1d130fd4	824	" ssthresh %"U16_F"\n",
mbed_official	0:51ac1d130fd4	825	pcb->cwnd, pcb->ssthresh));
mbed_official	0:51ac1d130fd4	826
mbed_official	0:51ac1d130fd4	827	/* The following needs to be called AFTER cwnd is set to one
mbed_official	0:51ac1d130fd4	828	mss - STJ */
mbed_official	0:51ac1d130fd4	829	tcp_rexmit_rto(pcb);
mbed_official	0:51ac1d130fd4	830	}
mbed_official	0:51ac1d130fd4	831	}
mbed_official	0:51ac1d130fd4	832	}
mbed_official	0:51ac1d130fd4	833	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
mbed_official	0:51ac1d130fd4	834	if (pcb->state == FIN_WAIT_2) {
mbed_official	0:51ac1d130fd4	835	if ((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official	0:51ac1d130fd4	836	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
mbed_official	0:51ac1d130fd4	837	++pcb_remove;
mbed_official	0:51ac1d130fd4	838	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
mbed_official	0:51ac1d130fd4	839	}
mbed_official	0:51ac1d130fd4	840	}
mbed_official	0:51ac1d130fd4	841
mbed_official	0:51ac1d130fd4	842	/* Check if KEEPALIVE should be sent */
mbed_official	0:51ac1d130fd4	843	if((pcb->so_options & SOF_KEEPALIVE) &&
mbed_official	0:51ac1d130fd4	844	((pcb->state == ESTABLISHED) \|\|
mbed_official	0:51ac1d130fd4	845	(pcb->state == CLOSE_WAIT))) {
mbed_official	0:51ac1d130fd4	846	#if LWIP_TCP_KEEPALIVE
mbed_official	0:51ac1d130fd4	847	if((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official	0:51ac1d130fd4	848	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
mbed_official	0:51ac1d130fd4	849	/ TCP_SLOW_INTERVAL)
mbed_official	0:51ac1d130fd4	850	#else
mbed_official	0:51ac1d130fd4	851	if((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official	0:51ac1d130fd4	852	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
mbed_official	0:51ac1d130fd4	853	#endif /* LWIP_TCP_KEEPALIVE */
mbed_official	0:51ac1d130fd4	854	{
mbed_official	0:51ac1d130fd4	855	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
mbed_official	0:51ac1d130fd4	856	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
mbed_official	0:51ac1d130fd4	857	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
mbed_official	0:51ac1d130fd4	858
mbed_official	0:51ac1d130fd4	859	++pcb_remove;
mbed_official	0:51ac1d130fd4	860	++pcb_reset;
mbed_official	0:51ac1d130fd4	861	}
mbed_official	0:51ac1d130fd4	862	#if LWIP_TCP_KEEPALIVE
mbed_official	0:51ac1d130fd4	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official	0:51ac1d130fd4	864	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
mbed_official	0:51ac1d130fd4	865	/ TCP_SLOW_INTERVAL)
mbed_official	0:51ac1d130fd4	866	#else
mbed_official	0:51ac1d130fd4	867	else if((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official	0:51ac1d130fd4	868	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
mbed_official	0:51ac1d130fd4	869	/ TCP_SLOW_INTERVAL)
mbed_official	0:51ac1d130fd4	870	#endif /* LWIP_TCP_KEEPALIVE */
mbed_official	0:51ac1d130fd4	871	{
mbed_official	0:51ac1d130fd4	872	tcp_keepalive(pcb);
mbed_official	0:51ac1d130fd4	873	pcb->keep_cnt_sent++;
mbed_official	0:51ac1d130fd4	874	}
mbed_official	0:51ac1d130fd4	875	}
mbed_official	0:51ac1d130fd4	876
mbed_official	0:51ac1d130fd4	877	/* If this PCB has queued out of sequence data, but has been
mbed_official	0:51ac1d130fd4	878	inactive for too long, will drop the data (it will eventually
mbed_official	0:51ac1d130fd4	879	be retransmitted). */
mbed_official	0:51ac1d130fd4	880	#if TCP_QUEUE_OOSEQ
mbed_official	0:51ac1d130fd4	881	if (pcb->ooseq != NULL &&
mbed_official	0:51ac1d130fd4	882	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
mbed_official	0:51ac1d130fd4	883	tcp_segs_free(pcb->ooseq);
mbed_official	0:51ac1d130fd4	884	pcb->ooseq = NULL;
mbed_official	0:51ac1d130fd4	885	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
mbed_official	0:51ac1d130fd4	886	}
mbed_official	0:51ac1d130fd4	887	#endif /* TCP_QUEUE_OOSEQ */
mbed_official	0:51ac1d130fd4	888
mbed_official	0:51ac1d130fd4	889	/* Check if this PCB has stayed too long in SYN-RCVD */
mbed_official	0:51ac1d130fd4	890	if (pcb->state == SYN_RCVD) {
mbed_official	0:51ac1d130fd4	891	if ((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official	0:51ac1d130fd4	892	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
mbed_official	0:51ac1d130fd4	893	++pcb_remove;
mbed_official	0:51ac1d130fd4	894	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
mbed_official	0:51ac1d130fd4	895	}
mbed_official	0:51ac1d130fd4	896	}
mbed_official	0:51ac1d130fd4	897
mbed_official	0:51ac1d130fd4	898	/* Check if this PCB has stayed too long in LAST-ACK */
mbed_official	0:51ac1d130fd4	899	if (pcb->state == LAST_ACK) {
mbed_official	0:51ac1d130fd4	900	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
mbed_official	0:51ac1d130fd4	901	++pcb_remove;
mbed_official	0:51ac1d130fd4	902	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
mbed_official	0:51ac1d130fd4	903	}
mbed_official	0:51ac1d130fd4	904	}
mbed_official	0:51ac1d130fd4	905
mbed_official	0:51ac1d130fd4	906	/* If the PCB should be removed, do it. */
mbed_official	0:51ac1d130fd4	907	if (pcb_remove) {
mbed_official	0:51ac1d130fd4	908	struct tcp_pcb *pcb2;
mbed_official	0:51ac1d130fd4	909	tcp_pcb_purge(pcb);
mbed_official	0:51ac1d130fd4	910	/* Remove PCB from tcp_active_pcbs list. */
mbed_official	0:51ac1d130fd4	911	if (prev != NULL) {
mbed_official	0:51ac1d130fd4	912	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
mbed_official	0:51ac1d130fd4	913	prev->next = pcb->next;
mbed_official	0:51ac1d130fd4	914	} else {
mbed_official	0:51ac1d130fd4	915	/* This PCB was the first. */
mbed_official	0:51ac1d130fd4	916	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
mbed_official	0:51ac1d130fd4	917	tcp_active_pcbs = pcb->next;
mbed_official	0:51ac1d130fd4	918	}
mbed_official	0:51ac1d130fd4	919
mbed_official	0:51ac1d130fd4	920	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
mbed_official	0:51ac1d130fd4	921	if (pcb_reset) {
mbed_official	0:51ac1d130fd4	922	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
mbed_official	0:51ac1d130fd4	923	pcb->local_port, pcb->remote_port);
mbed_official	0:51ac1d130fd4	924	}
mbed_official	0:51ac1d130fd4	925
mbed_official	0:51ac1d130fd4	926	pcb2 = pcb;
mbed_official	0:51ac1d130fd4	927	pcb = pcb->next;
mbed_official	0:51ac1d130fd4	928	memp_free(MEMP_TCP_PCB, pcb2);
mbed_official	0:51ac1d130fd4	929	} else {
mbed_official	0:51ac1d130fd4	930	/* get the 'next' element now and work with 'prev' below (in case of abort) */
mbed_official	0:51ac1d130fd4	931	prev = pcb;
mbed_official	0:51ac1d130fd4	932	pcb = pcb->next;
mbed_official	0:51ac1d130fd4	933
mbed_official	0:51ac1d130fd4	934	/* We check if we should poll the connection. */
mbed_official	0:51ac1d130fd4	935	++prev->polltmr;
mbed_official	0:51ac1d130fd4	936	if (prev->polltmr >= prev->pollinterval) {
mbed_official	0:51ac1d130fd4	937	prev->polltmr = 0;
mbed_official	0:51ac1d130fd4	938	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
mbed_official	0:51ac1d130fd4	939	TCP_EVENT_POLL(prev, err);
mbed_official	0:51ac1d130fd4	940	/* if err == ERR_ABRT, 'prev' is already deallocated */
mbed_official	0:51ac1d130fd4	941	if (err == ERR_OK) {
mbed_official	0:51ac1d130fd4	942	tcp_output(prev);
mbed_official	0:51ac1d130fd4	943	}
mbed_official	0:51ac1d130fd4	944	}
mbed_official	0:51ac1d130fd4	945	}
mbed_official	0:51ac1d130fd4	946	}
mbed_official	0:51ac1d130fd4	947
mbed_official	0:51ac1d130fd4	948
mbed_official	0:51ac1d130fd4	949	/* Steps through all of the TIME-WAIT PCBs. */
mbed_official	0:51ac1d130fd4	950	prev = NULL;
mbed_official	0:51ac1d130fd4	951	pcb = tcp_tw_pcbs;
mbed_official	0:51ac1d130fd4	952	while (pcb != NULL) {
mbed_official	0:51ac1d130fd4	953	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
mbed_official	0:51ac1d130fd4	954	pcb_remove = 0;
mbed_official	0:51ac1d130fd4	955
mbed_official	0:51ac1d130fd4	956	/* Check if this PCB has stayed long enough in TIME-WAIT */
mbed_official	0:51ac1d130fd4	957	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
mbed_official	0:51ac1d130fd4	958	++pcb_remove;
mbed_official	0:51ac1d130fd4	959	}
mbed_official	0:51ac1d130fd4	960
mbed_official	0:51ac1d130fd4	961
mbed_official	0:51ac1d130fd4	962
mbed_official	0:51ac1d130fd4	963	/* If the PCB should be removed, do it. */
mbed_official	0:51ac1d130fd4	964	if (pcb_remove) {
mbed_official	0:51ac1d130fd4	965	struct tcp_pcb *pcb2;
mbed_official	0:51ac1d130fd4	966	tcp_pcb_purge(pcb);
mbed_official	0:51ac1d130fd4	967	/* Remove PCB from tcp_tw_pcbs list. */
mbed_official	0:51ac1d130fd4	968	if (prev != NULL) {
mbed_official	0:51ac1d130fd4	969	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
mbed_official	0:51ac1d130fd4	970	prev->next = pcb->next;
mbed_official	0:51ac1d130fd4	971	} else {
mbed_official	0:51ac1d130fd4	972	/* This PCB was the first. */
mbed_official	0:51ac1d130fd4	973	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
mbed_official	0:51ac1d130fd4	974	tcp_tw_pcbs = pcb->next;
mbed_official	0:51ac1d130fd4	975	}
mbed_official	0:51ac1d130fd4	976	pcb2 = pcb;
mbed_official	0:51ac1d130fd4	977	pcb = pcb->next;
mbed_official	0:51ac1d130fd4	978	memp_free(MEMP_TCP_PCB, pcb2);
mbed_official	0:51ac1d130fd4	979	} else {
mbed_official	0:51ac1d130fd4	980	prev = pcb;
mbed_official	0:51ac1d130fd4	981	pcb = pcb->next;
mbed_official	0:51ac1d130fd4	982	}
mbed_official	0:51ac1d130fd4	983	}
mbed_official	0:51ac1d130fd4	984	}
mbed_official	0:51ac1d130fd4	985
mbed_official	0:51ac1d130fd4	986	/**
mbed_official	0:51ac1d130fd4	987	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
mbed_official	0:51ac1d130fd4	988	* "refused" by upper layer (application) and sends delayed ACKs.
mbed_official	0:51ac1d130fd4	989	*
mbed_official	0:51ac1d130fd4	990	* Automatically called from tcp_tmr().
mbed_official	0:51ac1d130fd4	991	*/
mbed_official	0:51ac1d130fd4	992	void
mbed_official	0:51ac1d130fd4	993	tcp_fasttmr(void)
mbed_official	0:51ac1d130fd4	994	{
mbed_official	0:51ac1d130fd4	995	struct tcp_pcb *pcb = tcp_active_pcbs;
mbed_official	0:51ac1d130fd4	996
mbed_official	0:51ac1d130fd4	997	while(pcb != NULL) {
mbed_official	0:51ac1d130fd4	998	struct tcp_pcb *next = pcb->next;
mbed_official	0:51ac1d130fd4	999	/* If there is data which was previously "refused" by upper layer */
mbed_official	0:51ac1d130fd4	1000	if (pcb->refused_data != NULL) {
mbed_official	0:51ac1d130fd4	1001	/* Notify again application with data previously received. */
mbed_official	0:51ac1d130fd4	1002	err_t err;
mbed_official	0:51ac1d130fd4	1003	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
mbed_official	0:51ac1d130fd4	1004	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
mbed_official	0:51ac1d130fd4	1005	if (err == ERR_OK) {
mbed_official	0:51ac1d130fd4	1006	pcb->refused_data = NULL;
mbed_official	0:51ac1d130fd4	1007	} else if (err == ERR_ABRT) {
mbed_official	0:51ac1d130fd4	1008	/* if err == ERR_ABRT, 'pcb' is already deallocated */
mbed_official	0:51ac1d130fd4	1009	pcb = NULL;
mbed_official	0:51ac1d130fd4	1010	}
mbed_official	0:51ac1d130fd4	1011	}
mbed_official	0:51ac1d130fd4	1012
mbed_official	0:51ac1d130fd4	1013	/* send delayed ACKs */
mbed_official	0:51ac1d130fd4	1014	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
mbed_official	0:51ac1d130fd4	1015	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
mbed_official	0:51ac1d130fd4	1016	tcp_ack_now(pcb);
mbed_official	0:51ac1d130fd4	1017	tcp_output(pcb);
mbed_official	0:51ac1d130fd4	1018	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
mbed_official	0:51ac1d130fd4	1019	}
mbed_official	0:51ac1d130fd4	1020
mbed_official	0:51ac1d130fd4	1021	pcb = next;
mbed_official	0:51ac1d130fd4	1022	}
mbed_official	0:51ac1d130fd4	1023	}
mbed_official	0:51ac1d130fd4	1024
mbed_official	0:51ac1d130fd4	1025	/**
mbed_official	0:51ac1d130fd4	1026	* Deallocates a list of TCP segments (tcp_seg structures).
mbed_official	0:51ac1d130fd4	1027	*
mbed_official	0:51ac1d130fd4	1028	* @param seg tcp_seg list of TCP segments to free
mbed_official	0:51ac1d130fd4	1029	*/
mbed_official	0:51ac1d130fd4	1030	void
mbed_official	0:51ac1d130fd4	1031	tcp_segs_free(struct tcp_seg *seg)
mbed_official	0:51ac1d130fd4	1032	{
mbed_official	0:51ac1d130fd4	1033	while (seg != NULL) {
mbed_official	0:51ac1d130fd4	1034	struct tcp_seg *next = seg->next;
mbed_official	0:51ac1d130fd4	1035	tcp_seg_free(seg);
mbed_official	0:51ac1d130fd4	1036	seg = next;
mbed_official	0:51ac1d130fd4	1037	}
mbed_official	0:51ac1d130fd4	1038	}
mbed_official	0:51ac1d130fd4	1039
mbed_official	0:51ac1d130fd4	1040	/**
mbed_official	0:51ac1d130fd4	1041	* Frees a TCP segment (tcp_seg structure).
mbed_official	0:51ac1d130fd4	1042	*
mbed_official	0:51ac1d130fd4	1043	* @param seg single tcp_seg to free
mbed_official	0:51ac1d130fd4	1044	*/
mbed_official	0:51ac1d130fd4	1045	void
mbed_official	0:51ac1d130fd4	1046	tcp_seg_free(struct tcp_seg *seg)
mbed_official	0:51ac1d130fd4	1047	{
mbed_official	0:51ac1d130fd4	1048	if (seg != NULL) {
mbed_official	0:51ac1d130fd4	1049	if (seg->p != NULL) {
mbed_official	0:51ac1d130fd4	1050	pbuf_free(seg->p);
mbed_official	0:51ac1d130fd4	1051	#if TCP_DEBUG
mbed_official	0:51ac1d130fd4	1052	seg->p = NULL;
mbed_official	0:51ac1d130fd4	1053	#endif /* TCP_DEBUG */
mbed_official	0:51ac1d130fd4	1054	}
mbed_official	0:51ac1d130fd4	1055	memp_free(MEMP_TCP_SEG, seg);
mbed_official	0:51ac1d130fd4	1056	}
mbed_official	0:51ac1d130fd4	1057	}
mbed_official	0:51ac1d130fd4	1058
mbed_official	0:51ac1d130fd4	1059	/**
mbed_official	0:51ac1d130fd4	1060	* Sets the priority of a connection.
mbed_official	0:51ac1d130fd4	1061	*
mbed_official	0:51ac1d130fd4	1062	* @param pcb the tcp_pcb to manipulate
mbed_official	0:51ac1d130fd4	1063	* @param prio new priority
mbed_official	0:51ac1d130fd4	1064	*/
mbed_official	0:51ac1d130fd4	1065	void
mbed_official	0:51ac1d130fd4	1066	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
mbed_official	0:51ac1d130fd4	1067	{
mbed_official	0:51ac1d130fd4	1068	pcb->prio = prio;
mbed_official	0:51ac1d130fd4	1069	}
mbed_official	0:51ac1d130fd4	1070
mbed_official	0:51ac1d130fd4	1071	#if TCP_QUEUE_OOSEQ
mbed_official	0:51ac1d130fd4	1072	/**
mbed_official	0:51ac1d130fd4	1073	* Returns a copy of the given TCP segment.
mbed_official	0:51ac1d130fd4	1074	* The pbuf and data are not copied, only the pointers
mbed_official	0:51ac1d130fd4	1075	*
mbed_official	0:51ac1d130fd4	1076	* @param seg the old tcp_seg
mbed_official	0:51ac1d130fd4	1077	* @return a copy of seg
mbed_official	0:51ac1d130fd4	1078	*/
mbed_official	0:51ac1d130fd4	1079	struct tcp_seg *
mbed_official	0:51ac1d130fd4	1080	tcp_seg_copy(struct tcp_seg *seg)
mbed_official	0:51ac1d130fd4	1081	{
mbed_official	0:51ac1d130fd4	1082	struct tcp_seg *cseg;
mbed_official	0:51ac1d130fd4	1083
mbed_official	0:51ac1d130fd4	1084	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
mbed_official	0:51ac1d130fd4	1085	if (cseg == NULL) {
mbed_official	0:51ac1d130fd4	1086	return NULL;
mbed_official	0:51ac1d130fd4	1087	}
mbed_official	0:51ac1d130fd4	1088	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
mbed_official	0:51ac1d130fd4	1089	pbuf_ref(cseg->p);
mbed_official	0:51ac1d130fd4	1090	return cseg;
mbed_official	0:51ac1d130fd4	1091	}
mbed_official	0:51ac1d130fd4	1092	#endif /* TCP_QUEUE_OOSEQ */
mbed_official	0:51ac1d130fd4	1093
mbed_official	0:51ac1d130fd4	1094	#if LWIP_CALLBACK_API
mbed_official	0:51ac1d130fd4	1095	/**
mbed_official	0:51ac1d130fd4	1096	* Default receive callback that is called if the user didn't register
mbed_official	0:51ac1d130fd4	1097	* a recv callback for the pcb.
mbed_official	0:51ac1d130fd4	1098	*/
mbed_official	0:51ac1d130fd4	1099	err_t
mbed_official	0:51ac1d130fd4	1100	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
mbed_official	0:51ac1d130fd4	1101	{
mbed_official	0:51ac1d130fd4	1102	LWIP_UNUSED_ARG(arg);
mbed_official	0:51ac1d130fd4	1103	if (p != NULL) {
mbed_official	0:51ac1d130fd4	1104	tcp_recved(pcb, p->tot_len);
mbed_official	0:51ac1d130fd4	1105	pbuf_free(p);
mbed_official	0:51ac1d130fd4	1106	} else if (err == ERR_OK) {
mbed_official	0:51ac1d130fd4	1107	return tcp_close(pcb);
mbed_official	0:51ac1d130fd4	1108	}
mbed_official	0:51ac1d130fd4	1109	return ERR_OK;
mbed_official	0:51ac1d130fd4	1110	}
mbed_official	0:51ac1d130fd4	1111	#endif /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	1112
mbed_official	0:51ac1d130fd4	1113	/**
mbed_official	0:51ac1d130fd4	1114	* Kills the oldest active connection that has lower priority than prio.
mbed_official	0:51ac1d130fd4	1115	*
mbed_official	0:51ac1d130fd4	1116	* @param prio minimum priority
mbed_official	0:51ac1d130fd4	1117	*/
mbed_official	0:51ac1d130fd4	1118	static void
mbed_official	0:51ac1d130fd4	1119	tcp_kill_prio(u8_t prio)
mbed_official	0:51ac1d130fd4	1120	{
mbed_official	0:51ac1d130fd4	1121	struct tcp_pcb pcb, inactive;
mbed_official	0:51ac1d130fd4	1122	u32_t inactivity;
mbed_official	0:51ac1d130fd4	1123	u8_t mprio;
mbed_official	0:51ac1d130fd4	1124
mbed_official	0:51ac1d130fd4	1125
mbed_official	0:51ac1d130fd4	1126	mprio = TCP_PRIO_MAX;
mbed_official	0:51ac1d130fd4	1127
mbed_official	0:51ac1d130fd4	1128	/* We kill the oldest active connection that has lower priority than prio. */
mbed_official	0:51ac1d130fd4	1129	inactivity = 0;
mbed_official	0:51ac1d130fd4	1130	inactive = NULL;
mbed_official	0:51ac1d130fd4	1131	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official	0:51ac1d130fd4	1132	if (pcb->prio <= prio &&
mbed_official	0:51ac1d130fd4	1133	pcb->prio <= mprio &&
mbed_official	0:51ac1d130fd4	1134	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
mbed_official	0:51ac1d130fd4	1135	inactivity = tcp_ticks - pcb->tmr;
mbed_official	0:51ac1d130fd4	1136	inactive = pcb;
mbed_official	0:51ac1d130fd4	1137	mprio = pcb->prio;
mbed_official	0:51ac1d130fd4	1138	}
mbed_official	0:51ac1d130fd4	1139	}
mbed_official	0:51ac1d130fd4	1140	if (inactive != NULL) {
mbed_official	0:51ac1d130fd4	1141	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
mbed_official	0:51ac1d130fd4	1142	(void *)inactive, inactivity));
mbed_official	0:51ac1d130fd4	1143	tcp_abort(inactive);
mbed_official	0:51ac1d130fd4	1144	}
mbed_official	0:51ac1d130fd4	1145	}
mbed_official	0:51ac1d130fd4	1146
mbed_official	0:51ac1d130fd4	1147	/**
mbed_official	0:51ac1d130fd4	1148	* Kills the oldest connection that is in TIME_WAIT state.
mbed_official	0:51ac1d130fd4	1149	* Called from tcp_alloc() if no more connections are available.
mbed_official	0:51ac1d130fd4	1150	*/
mbed_official	0:51ac1d130fd4	1151	static void
mbed_official	0:51ac1d130fd4	1152	tcp_kill_timewait(void)
mbed_official	0:51ac1d130fd4	1153	{
mbed_official	0:51ac1d130fd4	1154	struct tcp_pcb pcb, inactive;
mbed_official	0:51ac1d130fd4	1155	u32_t inactivity;
mbed_official	0:51ac1d130fd4	1156
mbed_official	0:51ac1d130fd4	1157	inactivity = 0;
mbed_official	0:51ac1d130fd4	1158	inactive = NULL;
mbed_official	0:51ac1d130fd4	1159	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
mbed_official	0:51ac1d130fd4	1160	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official	0:51ac1d130fd4	1161	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
mbed_official	0:51ac1d130fd4	1162	inactivity = tcp_ticks - pcb->tmr;
mbed_official	0:51ac1d130fd4	1163	inactive = pcb;
mbed_official	0:51ac1d130fd4	1164	}
mbed_official	0:51ac1d130fd4	1165	}
mbed_official	0:51ac1d130fd4	1166	if (inactive != NULL) {
mbed_official	0:51ac1d130fd4	1167	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
mbed_official	0:51ac1d130fd4	1168	(void *)inactive, inactivity));
mbed_official	0:51ac1d130fd4	1169	tcp_abort(inactive);
mbed_official	0:51ac1d130fd4	1170	}
mbed_official	0:51ac1d130fd4	1171	}
mbed_official	0:51ac1d130fd4	1172
mbed_official	0:51ac1d130fd4	1173	/**
mbed_official	0:51ac1d130fd4	1174	* Allocate a new tcp_pcb structure.
mbed_official	0:51ac1d130fd4	1175	*
mbed_official	0:51ac1d130fd4	1176	* @param prio priority for the new pcb
mbed_official	0:51ac1d130fd4	1177	* @return a new tcp_pcb that initially is in state CLOSED
mbed_official	0:51ac1d130fd4	1178	*/
mbed_official	0:51ac1d130fd4	1179	struct tcp_pcb *
mbed_official	0:51ac1d130fd4	1180	tcp_alloc(u8_t prio)
mbed_official	0:51ac1d130fd4	1181	{
mbed_official	0:51ac1d130fd4	1182	struct tcp_pcb *pcb;
mbed_official	0:51ac1d130fd4	1183	u32_t iss;
mbed_official	0:51ac1d130fd4	1184
mbed_official	0:51ac1d130fd4	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mbed_official	0:51ac1d130fd4	1186	if (pcb == NULL) {
mbed_official	0:51ac1d130fd4	1187	/* Try killing oldest connection in TIME-WAIT. */
mbed_official	0:51ac1d130fd4	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
mbed_official	0:51ac1d130fd4	1189	tcp_kill_timewait();
mbed_official	0:51ac1d130fd4	1190	/* Try to allocate a tcp_pcb again. */
mbed_official	0:51ac1d130fd4	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mbed_official	0:51ac1d130fd4	1192	if (pcb == NULL) {
mbed_official	0:51ac1d130fd4	1193	/* Try killing active connections with lower priority than the new one. */
mbed_official	0:51ac1d130fd4	1194	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
mbed_official	0:51ac1d130fd4	1195	tcp_kill_prio(prio);
mbed_official	0:51ac1d130fd4	1196	/* Try to allocate a tcp_pcb again. */
mbed_official	0:51ac1d130fd4	1197	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mbed_official	0:51ac1d130fd4	1198	if (pcb != NULL) {
mbed_official	0:51ac1d130fd4	1199	/* adjust err stats: memp_malloc failed twice before */
mbed_official	0:51ac1d130fd4	1200	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
mbed_official	0:51ac1d130fd4	1201	}
mbed_official	0:51ac1d130fd4	1202	}
mbed_official	0:51ac1d130fd4	1203	if (pcb != NULL) {
mbed_official	0:51ac1d130fd4	1204	/* adjust err stats: timewait PCB was freed above */
mbed_official	0:51ac1d130fd4	1205	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
mbed_official	0:51ac1d130fd4	1206	}
mbed_official	0:51ac1d130fd4	1207	}
mbed_official	0:51ac1d130fd4	1208	if (pcb != NULL) {
mbed_official	0:51ac1d130fd4	1209	memset(pcb, 0, sizeof(struct tcp_pcb));
mbed_official	0:51ac1d130fd4	1210	pcb->prio = prio;
mbed_official	0:51ac1d130fd4	1211	pcb->snd_buf = TCP_SND_BUF;
mbed_official	0:51ac1d130fd4	1212	pcb->snd_queuelen = 0;
mbed_official	0:51ac1d130fd4	1213	pcb->rcv_wnd = TCP_WND;
mbed_official	0:51ac1d130fd4	1214	pcb->rcv_ann_wnd = TCP_WND;
mbed_official	0:51ac1d130fd4	1215	pcb->tos = 0;
mbed_official	0:51ac1d130fd4	1216	pcb->ttl = TCP_TTL;
mbed_official	0:51ac1d130fd4	1217	/* As initial send MSS, we use TCP_MSS but limit it to 536.
mbed_official	0:51ac1d130fd4	1218	The send MSS is updated when an MSS option is received. */
mbed_official	0:51ac1d130fd4	1219	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
mbed_official	0:51ac1d130fd4	1220	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
mbed_official	0:51ac1d130fd4	1221	pcb->sa = 0;
mbed_official	0:51ac1d130fd4	1222	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
mbed_official	0:51ac1d130fd4	1223	pcb->rtime = -1;
mbed_official	0:51ac1d130fd4	1224	pcb->cwnd = 1;
mbed_official	0:51ac1d130fd4	1225	iss = tcp_next_iss();
mbed_official	0:51ac1d130fd4	1226	pcb->snd_wl2 = iss;
mbed_official	0:51ac1d130fd4	1227	pcb->snd_nxt = iss;
mbed_official	0:51ac1d130fd4	1228	pcb->lastack = iss;
mbed_official	0:51ac1d130fd4	1229	pcb->snd_lbb = iss;
mbed_official	0:51ac1d130fd4	1230	pcb->tmr = tcp_ticks;
mbed_official	0:51ac1d130fd4	1231
mbed_official	0:51ac1d130fd4	1232	pcb->polltmr = 0;
mbed_official	0:51ac1d130fd4	1233
mbed_official	0:51ac1d130fd4	1234	#if LWIP_CALLBACK_API
mbed_official	0:51ac1d130fd4	1235	pcb->recv = tcp_recv_null;
mbed_official	0:51ac1d130fd4	1236	#endif /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	1237
mbed_official	0:51ac1d130fd4	1238	/* Init KEEPALIVE timer */
mbed_official	0:51ac1d130fd4	1239	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
mbed_official	0:51ac1d130fd4	1240
mbed_official	0:51ac1d130fd4	1241	#if LWIP_TCP_KEEPALIVE
mbed_official	0:51ac1d130fd4	1242	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
mbed_official	0:51ac1d130fd4	1243	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
mbed_official	0:51ac1d130fd4	1244	#endif /* LWIP_TCP_KEEPALIVE */
mbed_official	0:51ac1d130fd4	1245
mbed_official	0:51ac1d130fd4	1246	pcb->keep_cnt_sent = 0;
mbed_official	0:51ac1d130fd4	1247	}
mbed_official	0:51ac1d130fd4	1248	return pcb;
mbed_official	0:51ac1d130fd4	1249	}
mbed_official	0:51ac1d130fd4	1250
mbed_official	0:51ac1d130fd4	1251	/**
mbed_official	0:51ac1d130fd4	1252	* Creates a new TCP protocol control block but doesn't place it on
mbed_official	0:51ac1d130fd4	1253	* any of the TCP PCB lists.
mbed_official	0:51ac1d130fd4	1254	* The pcb is not put on any list until binding using tcp_bind().
mbed_official	0:51ac1d130fd4	1255	*
mbed_official	0:51ac1d130fd4	1256	* @internal: Maybe there should be a idle TCP PCB list where these
mbed_official	0:51ac1d130fd4	1257	* PCBs are put on. Port reservation using tcp_bind() is implemented but
mbed_official	0:51ac1d130fd4	1258	* allocated pcbs that are not bound can't be killed automatically if wanting
mbed_official	0:51ac1d130fd4	1259	* to allocate a pcb with higher prio (@see tcp_kill_prio())
mbed_official	0:51ac1d130fd4	1260	*
mbed_official	0:51ac1d130fd4	1261	* @return a new tcp_pcb that initially is in state CLOSED
mbed_official	0:51ac1d130fd4	1262	*/
mbed_official	0:51ac1d130fd4	1263	struct tcp_pcb *
mbed_official	0:51ac1d130fd4	1264	tcp_new(void)
mbed_official	0:51ac1d130fd4	1265	{
mbed_official	0:51ac1d130fd4	1266	return tcp_alloc(TCP_PRIO_NORMAL);
mbed_official	0:51ac1d130fd4	1267	}
mbed_official	0:51ac1d130fd4	1268
mbed_official	0:51ac1d130fd4	1269	/**
mbed_official	0:51ac1d130fd4	1270	* Used to specify the argument that should be passed callback
mbed_official	0:51ac1d130fd4	1271	* functions.
mbed_official	0:51ac1d130fd4	1272	*
mbed_official	0:51ac1d130fd4	1273	* @param pcb tcp_pcb to set the callback argument
mbed_official	0:51ac1d130fd4	1274	* @param arg void pointer argument to pass to callback functions
mbed_official	0:51ac1d130fd4	1275	*/
mbed_official	0:51ac1d130fd4	1276	void
mbed_official	0:51ac1d130fd4	1277	tcp_arg(struct tcp_pcb pcb, void arg)
mbed_official	0:51ac1d130fd4	1278	{
mbed_official	0:51ac1d130fd4	1279	pcb->callback_arg = arg;
mbed_official	0:51ac1d130fd4	1280	}
mbed_official	0:51ac1d130fd4	1281	#if LWIP_CALLBACK_API
mbed_official	0:51ac1d130fd4	1282
mbed_official	0:51ac1d130fd4	1283	/**
mbed_official	0:51ac1d130fd4	1284	* Used to specify the function that should be called when a TCP
mbed_official	0:51ac1d130fd4	1285	* connection receives data.
mbed_official	0:51ac1d130fd4	1286	*
mbed_official	0:51ac1d130fd4	1287	* @param pcb tcp_pcb to set the recv callback
mbed_official	0:51ac1d130fd4	1288	* @param recv callback function to call for this pcb when data is received
mbed_official	0:51ac1d130fd4	1289	*/
mbed_official	0:51ac1d130fd4	1290	void
mbed_official	0:51ac1d130fd4	1291	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
mbed_official	0:51ac1d130fd4	1292	{
mbed_official	0:51ac1d130fd4	1293	pcb->recv = recv;
mbed_official	0:51ac1d130fd4	1294	}
mbed_official	0:51ac1d130fd4	1295
mbed_official	0:51ac1d130fd4	1296	/**
mbed_official	0:51ac1d130fd4	1297	* Used to specify the function that should be called when TCP data
mbed_official	0:51ac1d130fd4	1298	* has been successfully delivered to the remote host.
mbed_official	0:51ac1d130fd4	1299	*
mbed_official	0:51ac1d130fd4	1300	* @param pcb tcp_pcb to set the sent callback
mbed_official	0:51ac1d130fd4	1301	* @param sent callback function to call for this pcb when data is successfully sent
mbed_official	0:51ac1d130fd4	1302	*/
mbed_official	0:51ac1d130fd4	1303	void
mbed_official	0:51ac1d130fd4	1304	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
mbed_official	0:51ac1d130fd4	1305	{
mbed_official	0:51ac1d130fd4	1306	pcb->sent = sent;
mbed_official	0:51ac1d130fd4	1307	}
mbed_official	0:51ac1d130fd4	1308
mbed_official	0:51ac1d130fd4	1309	/**
mbed_official	0:51ac1d130fd4	1310	* Used to specify the function that should be called when a fatal error
mbed_official	0:51ac1d130fd4	1311	* has occured on the connection.
mbed_official	0:51ac1d130fd4	1312	*
mbed_official	0:51ac1d130fd4	1313	* @param pcb tcp_pcb to set the err callback
mbed_official	0:51ac1d130fd4	1314	* @param err callback function to call for this pcb when a fatal error
mbed_official	0:51ac1d130fd4	1315	* has occured on the connection
mbed_official	0:51ac1d130fd4	1316	*/
mbed_official	0:51ac1d130fd4	1317	void
mbed_official	0:51ac1d130fd4	1318	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
mbed_official	0:51ac1d130fd4	1319	{
mbed_official	0:51ac1d130fd4	1320	pcb->errf = err;
mbed_official	0:51ac1d130fd4	1321	}
mbed_official	0:51ac1d130fd4	1322
mbed_official	0:51ac1d130fd4	1323	/**
mbed_official	0:51ac1d130fd4	1324	* Used for specifying the function that should be called when a
mbed_official	0:51ac1d130fd4	1325	* LISTENing connection has been connected to another host.
mbed_official	0:51ac1d130fd4	1326	*
mbed_official	0:51ac1d130fd4	1327	* @param pcb tcp_pcb to set the accept callback
mbed_official	0:51ac1d130fd4	1328	* @param accept callback function to call for this pcb when LISTENing
mbed_official	0:51ac1d130fd4	1329	* connection has been connected to another host
mbed_official	0:51ac1d130fd4	1330	*/
mbed_official	0:51ac1d130fd4	1331	void
mbed_official	0:51ac1d130fd4	1332	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
mbed_official	0:51ac1d130fd4	1333	{
mbed_official	0:51ac1d130fd4	1334	pcb->accept = accept;
mbed_official	0:51ac1d130fd4	1335	}
mbed_official	0:51ac1d130fd4	1336	#endif /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	1337
mbed_official	0:51ac1d130fd4	1338
mbed_official	0:51ac1d130fd4	1339	/**
mbed_official	0:51ac1d130fd4	1340	* Used to specify the function that should be called periodically
mbed_official	0:51ac1d130fd4	1341	* from TCP. The interval is specified in terms of the TCP coarse
mbed_official	0:51ac1d130fd4	1342	* timer interval, which is called twice a second.
mbed_official	0:51ac1d130fd4	1343	*
mbed_official	0:51ac1d130fd4	1344	*/
mbed_official	0:51ac1d130fd4	1345	void
mbed_official	0:51ac1d130fd4	1346	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
mbed_official	0:51ac1d130fd4	1347	{
mbed_official	0:51ac1d130fd4	1348	#if LWIP_CALLBACK_API
mbed_official	0:51ac1d130fd4	1349	pcb->poll = poll;
mbed_official	0:51ac1d130fd4	1350	#else /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	1351	LWIP_UNUSED_ARG(poll);
mbed_official	0:51ac1d130fd4	1352	#endif /* LWIP_CALLBACK_API */
mbed_official	0:51ac1d130fd4	1353	pcb->pollinterval = interval;
mbed_official	0:51ac1d130fd4	1354	}
mbed_official	0:51ac1d130fd4	1355
mbed_official	0:51ac1d130fd4	1356	/**
mbed_official	0:51ac1d130fd4	1357	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
mbed_official	0:51ac1d130fd4	1358	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
mbed_official	0:51ac1d130fd4	1359	*
mbed_official	0:51ac1d130fd4	1360	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
mbed_official	0:51ac1d130fd4	1361	*/
mbed_official	0:51ac1d130fd4	1362	void
mbed_official	0:51ac1d130fd4	1363	tcp_pcb_purge(struct tcp_pcb *pcb)
mbed_official	0:51ac1d130fd4	1364	{
mbed_official	0:51ac1d130fd4	1365	if (pcb->state != CLOSED &&
mbed_official	0:51ac1d130fd4	1366	pcb->state != TIME_WAIT &&
mbed_official	0:51ac1d130fd4	1367	pcb->state != LISTEN) {
mbed_official	0:51ac1d130fd4	1368
mbed_official	0:51ac1d130fd4	1369	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
mbed_official	0:51ac1d130fd4	1370
mbed_official	0:51ac1d130fd4	1371	#if TCP_LISTEN_BACKLOG
mbed_official	0:51ac1d130fd4	1372	if (pcb->state == SYN_RCVD) {
mbed_official	0:51ac1d130fd4	1373	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
mbed_official	0:51ac1d130fd4	1374	struct tcp_pcb_listen *lpcb;
mbed_official	0:51ac1d130fd4	1375	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
mbed_official	0:51ac1d130fd4	1376	tcp_listen_pcbs.listen_pcbs != NULL);
mbed_official	0:51ac1d130fd4	1377	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
mbed_official	0:51ac1d130fd4	1378	if ((lpcb->local_port == pcb->local_port) &&
mbed_official	0:51ac1d130fd4	1379	(ip_addr_isany(&lpcb->local_ip) \|\|
mbed_official	0:51ac1d130fd4	1380	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
mbed_official	0:51ac1d130fd4	1381	/* port and address of the listen pcb match the timed-out pcb */
mbed_official	0:51ac1d130fd4	1382	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
mbed_official	0:51ac1d130fd4	1383	lpcb->accepts_pending > 0);
mbed_official	0:51ac1d130fd4	1384	lpcb->accepts_pending--;
mbed_official	0:51ac1d130fd4	1385	break;
mbed_official	0:51ac1d130fd4	1386	}
mbed_official	0:51ac1d130fd4	1387	}
mbed_official	0:51ac1d130fd4	1388	}
mbed_official	0:51ac1d130fd4	1389	#endif /* TCP_LISTEN_BACKLOG */
mbed_official	0:51ac1d130fd4	1390
mbed_official	0:51ac1d130fd4	1391
mbed_official	0:51ac1d130fd4	1392	if (pcb->refused_data != NULL) {
mbed_official	0:51ac1d130fd4	1393	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
mbed_official	0:51ac1d130fd4	1394	pbuf_free(pcb->refused_data);
mbed_official	0:51ac1d130fd4	1395	pcb->refused_data = NULL;
mbed_official	0:51ac1d130fd4	1396	}
mbed_official	0:51ac1d130fd4	1397	if (pcb->unsent != NULL) {
mbed_official	0:51ac1d130fd4	1398	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
mbed_official	0:51ac1d130fd4	1399	}
mbed_official	0:51ac1d130fd4	1400	if (pcb->unacked != NULL) {
mbed_official	0:51ac1d130fd4	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
mbed_official	0:51ac1d130fd4	1402	}
mbed_official	0:51ac1d130fd4	1403	#if TCP_QUEUE_OOSEQ
mbed_official	0:51ac1d130fd4	1404	if (pcb->ooseq != NULL) {
mbed_official	0:51ac1d130fd4	1405	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
mbed_official	0:51ac1d130fd4	1406	}
mbed_official	0:51ac1d130fd4	1407	tcp_segs_free(pcb->ooseq);
mbed_official	0:51ac1d130fd4	1408	pcb->ooseq = NULL;
mbed_official	0:51ac1d130fd4	1409	#endif /* TCP_QUEUE_OOSEQ */
mbed_official	0:51ac1d130fd4	1410
mbed_official	0:51ac1d130fd4	1411	/* Stop the retransmission timer as it will expect data on unacked
mbed_official	0:51ac1d130fd4	1412	queue if it fires */
mbed_official	0:51ac1d130fd4	1413	pcb->rtime = -1;
mbed_official	0:51ac1d130fd4	1414
mbed_official	0:51ac1d130fd4	1415	tcp_segs_free(pcb->unsent);
mbed_official	0:51ac1d130fd4	1416	tcp_segs_free(pcb->unacked);
mbed_official	0:51ac1d130fd4	1417	pcb->unacked = pcb->unsent = NULL;
mbed_official	0:51ac1d130fd4	1418	#if TCP_OVERSIZE
mbed_official	0:51ac1d130fd4	1419	pcb->unsent_oversize = 0;
mbed_official	0:51ac1d130fd4	1420	#endif /* TCP_OVERSIZE */
mbed_official	0:51ac1d130fd4	1421	}
mbed_official	0:51ac1d130fd4	1422	}
mbed_official	0:51ac1d130fd4	1423
mbed_official	0:51ac1d130fd4	1424	/**
mbed_official	0:51ac1d130fd4	1425	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
mbed_official	0:51ac1d130fd4	1426	*
mbed_official	0:51ac1d130fd4	1427	* @param pcblist PCB list to purge.
mbed_official	0:51ac1d130fd4	1428	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
mbed_official	0:51ac1d130fd4	1429	*/
mbed_official	0:51ac1d130fd4	1430	void
mbed_official	0:51ac1d130fd4	1431	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
mbed_official	0:51ac1d130fd4	1432	{
mbed_official	0:51ac1d130fd4	1433	TCP_RMV(pcblist, pcb);
mbed_official	0:51ac1d130fd4	1434
mbed_official	0:51ac1d130fd4	1435	tcp_pcb_purge(pcb);
mbed_official	0:51ac1d130fd4	1436
mbed_official	0:51ac1d130fd4	1437	/* if there is an outstanding delayed ACKs, send it */
mbed_official	0:51ac1d130fd4	1438	if (pcb->state != TIME_WAIT &&
mbed_official	0:51ac1d130fd4	1439	pcb->state != LISTEN &&
mbed_official	0:51ac1d130fd4	1440	pcb->flags & TF_ACK_DELAY) {
mbed_official	0:51ac1d130fd4	1441	pcb->flags \|= TF_ACK_NOW;
mbed_official	0:51ac1d130fd4	1442	tcp_output(pcb);
mbed_official	0:51ac1d130fd4	1443	}
mbed_official	0:51ac1d130fd4	1444
mbed_official	0:51ac1d130fd4	1445	if (pcb->state != LISTEN) {
mbed_official	0:51ac1d130fd4	1446	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
mbed_official	0:51ac1d130fd4	1447	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
mbed_official	0:51ac1d130fd4	1448	#if TCP_QUEUE_OOSEQ
mbed_official	0:51ac1d130fd4	1449	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
mbed_official	0:51ac1d130fd4	1450	#endif /* TCP_QUEUE_OOSEQ */
mbed_official	0:51ac1d130fd4	1451	}
mbed_official	0:51ac1d130fd4	1452
mbed_official	0:51ac1d130fd4	1453	pcb->state = CLOSED;
mbed_official	0:51ac1d130fd4	1454
mbed_official	0:51ac1d130fd4	1455	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
mbed_official	0:51ac1d130fd4	1456	}
mbed_official	0:51ac1d130fd4	1457
mbed_official	0:51ac1d130fd4	1458	/**
mbed_official	0:51ac1d130fd4	1459	* Calculates a new initial sequence number for new connections.
mbed_official	0:51ac1d130fd4	1460	*
mbed_official	0:51ac1d130fd4	1461	* @return u32_t pseudo random sequence number
mbed_official	0:51ac1d130fd4	1462	*/
mbed_official	0:51ac1d130fd4	1463	u32_t
mbed_official	0:51ac1d130fd4	1464	tcp_next_iss(void)
mbed_official	0:51ac1d130fd4	1465	{
mbed_official	0:51ac1d130fd4	1466	static u32_t iss = 6510;
mbed_official	0:51ac1d130fd4	1467
mbed_official	0:51ac1d130fd4	1468	iss += tcp_ticks; /* XXX */
mbed_official	0:51ac1d130fd4	1469	return iss;
mbed_official	0:51ac1d130fd4	1470	}
mbed_official	0:51ac1d130fd4	1471
mbed_official	0:51ac1d130fd4	1472	#if TCP_CALCULATE_EFF_SEND_MSS
mbed_official	0:51ac1d130fd4	1473	/**
mbed_official	0:51ac1d130fd4	1474	* Calcluates the effective send mss that can be used for a specific IP address
mbed_official	0:51ac1d130fd4	1475	* by using ip_route to determin the netif used to send to the address and
mbed_official	0:51ac1d130fd4	1476	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
mbed_official	0:51ac1d130fd4	1477	*/
mbed_official	0:51ac1d130fd4	1478	u16_t
mbed_official	0:51ac1d130fd4	1479	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
mbed_official	0:51ac1d130fd4	1480	{
mbed_official	0:51ac1d130fd4	1481	u16_t mss_s;
mbed_official	0:51ac1d130fd4	1482	struct netif *outif;
mbed_official	0:51ac1d130fd4	1483
mbed_official	0:51ac1d130fd4	1484	outif = ip_route(addr);
mbed_official	0:51ac1d130fd4	1485	if ((outif != NULL) && (outif->mtu != 0)) {
mbed_official	0:51ac1d130fd4	1486	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
mbed_official	0:51ac1d130fd4	1487	/* RFC 1122, chap 4.2.2.6:
mbed_official	0:51ac1d130fd4	1488	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
mbed_official	0:51ac1d130fd4	1489	* We correct for TCP options in tcp_write(), and don't support IP options.
mbed_official	0:51ac1d130fd4	1490	*/
mbed_official	0:51ac1d130fd4	1491	sendmss = LWIP_MIN(sendmss, mss_s);
mbed_official	0:51ac1d130fd4	1492	}
mbed_official	0:51ac1d130fd4	1493	return sendmss;
mbed_official	0:51ac1d130fd4	1494	}
mbed_official	0:51ac1d130fd4	1495	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
mbed_official	0:51ac1d130fd4	1496
mbed_official	0:51ac1d130fd4	1497	const char*
mbed_official	0:51ac1d130fd4	1498	tcp_debug_state_str(enum tcp_state s)
mbed_official	0:51ac1d130fd4	1499	{
mbed_official	0:51ac1d130fd4	1500	return tcp_state_str[s];
mbed_official	0:51ac1d130fd4	1501	}
mbed_official	0:51ac1d130fd4	1502
mbed_official	0:51ac1d130fd4	1503	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
mbed_official	0:51ac1d130fd4	1504	/**
mbed_official	0:51ac1d130fd4	1505	* Print a tcp header for debugging purposes.
mbed_official	0:51ac1d130fd4	1506	*
mbed_official	0:51ac1d130fd4	1507	* @param tcphdr pointer to a struct tcp_hdr
mbed_official	0:51ac1d130fd4	1508	*/
mbed_official	0:51ac1d130fd4	1509	void
mbed_official	0:51ac1d130fd4	1510	tcp_debug_print(struct tcp_hdr *tcphdr)
mbed_official	0:51ac1d130fd4	1511	{
mbed_official	0:51ac1d130fd4	1512	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
mbed_official	0:51ac1d130fd4	1513	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official	0:51ac1d130fd4	1514	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
mbed_official	0:51ac1d130fd4	1515	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
mbed_official	0:51ac1d130fd4	1516	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official	0:51ac1d130fd4	1517	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
mbed_official	0:51ac1d130fd4	1518	ntohl(tcphdr->seqno)));
mbed_official	0:51ac1d130fd4	1519	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official	0:51ac1d130fd4	1520	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
mbed_official	0:51ac1d130fd4	1521	ntohl(tcphdr->ackno)));
mbed_official	0:51ac1d130fd4	1522	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official	0:51ac1d130fd4	1523	LWIP_DEBUGF(TCP_DEBUG, ("\| %2"U16_F" \| \|%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"\| %5"U16_F" \| (hdrlen, flags (",
mbed_official	0:51ac1d130fd4	1524	TCPH_HDRLEN(tcphdr),
mbed_official	0:51ac1d130fd4	1525	TCPH_FLAGS(tcphdr) >> 5 & 1,
mbed_official	0:51ac1d130fd4	1526	TCPH_FLAGS(tcphdr) >> 4 & 1,
mbed_official	0:51ac1d130fd4	1527	TCPH_FLAGS(tcphdr) >> 3 & 1,
mbed_official	0:51ac1d130fd4	1528	TCPH_FLAGS(tcphdr) >> 2 & 1,
mbed_official	0:51ac1d130fd4	1529	TCPH_FLAGS(tcphdr) >> 1 & 1,
mbed_official	0:51ac1d130fd4	1530	TCPH_FLAGS(tcphdr) & 1,
mbed_official	0:51ac1d130fd4	1531	ntohs(tcphdr->wnd)));
mbed_official	0:51ac1d130fd4	1532	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
mbed_official	0:51ac1d130fd4	1533	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
mbed_official	0:51ac1d130fd4	1534	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official	0:51ac1d130fd4	1535	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
mbed_official	0:51ac1d130fd4	1536	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
mbed_official	0:51ac1d130fd4	1537	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official	0:51ac1d130fd4	1538	}
mbed_official	0:51ac1d130fd4	1539
mbed_official	0:51ac1d130fd4	1540	/**
mbed_official	0:51ac1d130fd4	1541	* Print a tcp state for debugging purposes.
mbed_official	0:51ac1d130fd4	1542	*
mbed_official	0:51ac1d130fd4	1543	* @param s enum tcp_state to print
mbed_official	0:51ac1d130fd4	1544	*/
mbed_official	0:51ac1d130fd4	1545	void
mbed_official	0:51ac1d130fd4	1546	tcp_debug_print_state(enum tcp_state s)
mbed_official	0:51ac1d130fd4	1547	{
mbed_official	0:51ac1d130fd4	1548	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
mbed_official	0:51ac1d130fd4	1549	}
mbed_official	0:51ac1d130fd4	1550
mbed_official	0:51ac1d130fd4	1551	/**
mbed_official	0:51ac1d130fd4	1552	* Print tcp flags for debugging purposes.
mbed_official	0:51ac1d130fd4	1553	*
mbed_official	0:51ac1d130fd4	1554	* @param flags tcp flags, all active flags are printed
mbed_official	0:51ac1d130fd4	1555	*/
mbed_official	0:51ac1d130fd4	1556	void
mbed_official	0:51ac1d130fd4	1557	tcp_debug_print_flags(u8_t flags)
mbed_official	0:51ac1d130fd4	1558	{
mbed_official	0:51ac1d130fd4	1559	if (flags & TCP_FIN) {
mbed_official	0:51ac1d130fd4	1560	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
mbed_official	0:51ac1d130fd4	1561	}
mbed_official	0:51ac1d130fd4	1562	if (flags & TCP_SYN) {
mbed_official	0:51ac1d130fd4	1563	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
mbed_official	0:51ac1d130fd4	1564	}
mbed_official	0:51ac1d130fd4	1565	if (flags & TCP_RST) {
mbed_official	0:51ac1d130fd4	1566	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
mbed_official	0:51ac1d130fd4	1567	}
mbed_official	0:51ac1d130fd4	1568	if (flags & TCP_PSH) {
mbed_official	0:51ac1d130fd4	1569	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
mbed_official	0:51ac1d130fd4	1570	}
mbed_official	0:51ac1d130fd4	1571	if (flags & TCP_ACK) {
mbed_official	0:51ac1d130fd4	1572	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
mbed_official	0:51ac1d130fd4	1573	}
mbed_official	0:51ac1d130fd4	1574	if (flags & TCP_URG) {
mbed_official	0:51ac1d130fd4	1575	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
mbed_official	0:51ac1d130fd4	1576	}
mbed_official	0:51ac1d130fd4	1577	if (flags & TCP_ECE) {
mbed_official	0:51ac1d130fd4	1578	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
mbed_official	0:51ac1d130fd4	1579	}
mbed_official	0:51ac1d130fd4	1580	if (flags & TCP_CWR) {
mbed_official	0:51ac1d130fd4	1581	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
mbed_official	0:51ac1d130fd4	1582	}
mbed_official	0:51ac1d130fd4	1583	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
mbed_official	0:51ac1d130fd4	1584	}
mbed_official	0:51ac1d130fd4	1585
mbed_official	0:51ac1d130fd4	1586	/**
mbed_official	0:51ac1d130fd4	1587	* Print all tcp_pcbs in every list for debugging purposes.
mbed_official	0:51ac1d130fd4	1588	*/
mbed_official	0:51ac1d130fd4	1589	void
mbed_official	0:51ac1d130fd4	1590	tcp_debug_print_pcbs(void)
mbed_official	0:51ac1d130fd4	1591	{
mbed_official	0:51ac1d130fd4	1592	struct tcp_pcb *pcb;
mbed_official	0:51ac1d130fd4	1593	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
mbed_official	0:51ac1d130fd4	1594	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official	0:51ac1d130fd4	1595	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mbed_official	0:51ac1d130fd4	1596	pcb->local_port, pcb->remote_port,
mbed_official	0:51ac1d130fd4	1597	pcb->snd_nxt, pcb->rcv_nxt));
mbed_official	0:51ac1d130fd4	1598	tcp_debug_print_state(pcb->state);
mbed_official	0:51ac1d130fd4	1599	}
mbed_official	0:51ac1d130fd4	1600	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
mbed_official	0:51ac1d130fd4	1601	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official	0:51ac1d130fd4	1602	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mbed_official	0:51ac1d130fd4	1603	pcb->local_port, pcb->remote_port,
mbed_official	0:51ac1d130fd4	1604	pcb->snd_nxt, pcb->rcv_nxt));
mbed_official	0:51ac1d130fd4	1605	tcp_debug_print_state(pcb->state);
mbed_official	0:51ac1d130fd4	1606	}
mbed_official	0:51ac1d130fd4	1607	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
mbed_official	0:51ac1d130fd4	1608	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official	0:51ac1d130fd4	1609	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mbed_official	0:51ac1d130fd4	1610	pcb->local_port, pcb->remote_port,
mbed_official	0:51ac1d130fd4	1611	pcb->snd_nxt, pcb->rcv_nxt));
mbed_official	0:51ac1d130fd4	1612	tcp_debug_print_state(pcb->state);
mbed_official	0:51ac1d130fd4	1613	}
mbed_official	0:51ac1d130fd4	1614	}
mbed_official	0:51ac1d130fd4	1615
mbed_official	0:51ac1d130fd4	1616	/**
mbed_official	0:51ac1d130fd4	1617	* Check state consistency of the tcp_pcb lists.
mbed_official	0:51ac1d130fd4	1618	*/
mbed_official	0:51ac1d130fd4	1619	s16_t
mbed_official	0:51ac1d130fd4	1620	tcp_pcbs_sane(void)
mbed_official	0:51ac1d130fd4	1621	{
mbed_official	0:51ac1d130fd4	1622	struct tcp_pcb *pcb;
mbed_official	0:51ac1d130fd4	1623	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official	0:51ac1d130fd4	1624	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
mbed_official	0:51ac1d130fd4	1625	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
mbed_official	0:51ac1d130fd4	1626	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
mbed_official	0:51ac1d130fd4	1627	}
mbed_official	0:51ac1d130fd4	1628	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official	0:51ac1d130fd4	1629	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
mbed_official	0:51ac1d130fd4	1630	}
mbed_official	0:51ac1d130fd4	1631	return 1;
mbed_official	0:51ac1d130fd4	1632	}
mbed_official	0:51ac1d130fd4	1633	#endif /* TCP_DEBUG */
mbed_official	0:51ac1d130fd4	1634
mbed_official	0:51ac1d130fd4	1635	#endif /* LWIP_TCP */

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Type:	Library
Created:	15 Sep 2014
Imports:	0
Forks:	1
Commits:	30
Dependents:	1
Dependencies:	0
Followers:	6

core/tcp.c@29:da6f39d13880, 2015-01-08 (annotated)

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