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This library is stripped down version of NetServices library. HTTP server and client function is NOT supported.

lwip/core/tcp.c@0:dcf3c92487ca, 2011-07-20 (annotated)

Committer:: idinor
Date:: Wed Jul 20 11:45:39 2011 +0000
Revision:: 0:dcf3c92487ca

Who changed what in which revision?

User	Revision	Line number	New contents of line
idinor	0:dcf3c92487ca	1	/**
idinor	0:dcf3c92487ca	2	* @file
idinor	0:dcf3c92487ca	3	* Transmission Control Protocol for IP
idinor	0:dcf3c92487ca	4	*
idinor	0:dcf3c92487ca	5	* This file contains common functions for the TCP implementation, such as functinos
idinor	0:dcf3c92487ca	6	* for manipulating the data structures and the TCP timer functions. TCP functions
idinor	0:dcf3c92487ca	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
idinor	0:dcf3c92487ca	8	*
idinor	0:dcf3c92487ca	9	*/
idinor	0:dcf3c92487ca	10
idinor	0:dcf3c92487ca	11	/*
idinor	0:dcf3c92487ca	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
idinor	0:dcf3c92487ca	13	* All rights reserved.
idinor	0:dcf3c92487ca	14	*
idinor	0:dcf3c92487ca	15	* Redistribution and use in source and binary forms, with or without modification,
idinor	0:dcf3c92487ca	16	* are permitted provided that the following conditions are met:
idinor	0:dcf3c92487ca	17	*
idinor	0:dcf3c92487ca	18	* 1. Redistributions of source code must retain the above copyright notice,
idinor	0:dcf3c92487ca	19	* this list of conditions and the following disclaimer.
idinor	0:dcf3c92487ca	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
idinor	0:dcf3c92487ca	21	* this list of conditions and the following disclaimer in the documentation
idinor	0:dcf3c92487ca	22	* and/or other materials provided with the distribution.
idinor	0:dcf3c92487ca	23	* 3. The name of the author may not be used to endorse or promote products
idinor	0:dcf3c92487ca	24	* derived from this software without specific prior written permission.
idinor	0:dcf3c92487ca	25	*
idinor	0:dcf3c92487ca	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
idinor	0:dcf3c92487ca	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
idinor	0:dcf3c92487ca	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
idinor	0:dcf3c92487ca	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
idinor	0:dcf3c92487ca	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
idinor	0:dcf3c92487ca	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
idinor	0:dcf3c92487ca	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
idinor	0:dcf3c92487ca	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
idinor	0:dcf3c92487ca	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
idinor	0:dcf3c92487ca	35	* OF SUCH DAMAGE.
idinor	0:dcf3c92487ca	36	*
idinor	0:dcf3c92487ca	37	* This file is part of the lwIP TCP/IP stack.
idinor	0:dcf3c92487ca	38	*
idinor	0:dcf3c92487ca	39	* Author: Adam Dunkels <adam@sics.se>
idinor	0:dcf3c92487ca	40	*
idinor	0:dcf3c92487ca	41	*/
idinor	0:dcf3c92487ca	42
idinor	0:dcf3c92487ca	43	#include "lwip/opt.h"
idinor	0:dcf3c92487ca	44
idinor	0:dcf3c92487ca	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
idinor	0:dcf3c92487ca	46
idinor	0:dcf3c92487ca	47	#include "lwip/def.h"
idinor	0:dcf3c92487ca	48	#include "lwip/mem.h"
idinor	0:dcf3c92487ca	49	#include "lwip/memp.h"
idinor	0:dcf3c92487ca	50	#include "lwip/snmp.h"
idinor	0:dcf3c92487ca	51	#include "lwip/tcp.h"
idinor	0:dcf3c92487ca	52	#include "lwip/tcp_impl.h"
idinor	0:dcf3c92487ca	53	#include "lwip/debug.h"
idinor	0:dcf3c92487ca	54	#include "lwip/stats.h"
idinor	0:dcf3c92487ca	55
idinor	0:dcf3c92487ca	56	#include <string.h>
idinor	0:dcf3c92487ca	57
idinor	0:dcf3c92487ca	58	const char * const tcp_state_str[] = {
idinor	0:dcf3c92487ca	59	"CLOSED",
idinor	0:dcf3c92487ca	60	"LISTEN",
idinor	0:dcf3c92487ca	61	"SYN_SENT",
idinor	0:dcf3c92487ca	62	"SYN_RCVD",
idinor	0:dcf3c92487ca	63	"ESTABLISHED",
idinor	0:dcf3c92487ca	64	"FIN_WAIT_1",
idinor	0:dcf3c92487ca	65	"FIN_WAIT_2",
idinor	0:dcf3c92487ca	66	"CLOSE_WAIT",
idinor	0:dcf3c92487ca	67	"CLOSING",
idinor	0:dcf3c92487ca	68	"LAST_ACK",
idinor	0:dcf3c92487ca	69	"TIME_WAIT"
idinor	0:dcf3c92487ca	70	};
idinor	0:dcf3c92487ca	71
idinor	0:dcf3c92487ca	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
idinor	0:dcf3c92487ca	73	u32_t tcp_ticks;
idinor	0:dcf3c92487ca	74	const u8_t tcp_backoff[13] =
idinor	0:dcf3c92487ca	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
idinor	0:dcf3c92487ca	76	/* Times per slowtmr hits */
idinor	0:dcf3c92487ca	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
idinor	0:dcf3c92487ca	78
idinor	0:dcf3c92487ca	79	/* The TCP PCB lists. */
idinor	0:dcf3c92487ca	80
idinor	0:dcf3c92487ca	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
idinor	0:dcf3c92487ca	82	struct tcp_pcb *tcp_bound_pcbs;
idinor	0:dcf3c92487ca	83	/** List of all TCP PCBs in LISTEN state */
idinor	0:dcf3c92487ca	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
idinor	0:dcf3c92487ca	85	/** List of all TCP PCBs that are in a state in which
idinor	0:dcf3c92487ca	86	* they accept or send data. */
idinor	0:dcf3c92487ca	87	struct tcp_pcb *tcp_active_pcbs;
idinor	0:dcf3c92487ca	88	/** List of all TCP PCBs in TIME-WAIT state */
idinor	0:dcf3c92487ca	89	struct tcp_pcb *tcp_tw_pcbs;
idinor	0:dcf3c92487ca	90
idinor	0:dcf3c92487ca	91	#define NUM_TCP_PCB_LISTS 4
idinor	0:dcf3c92487ca	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
idinor	0:dcf3c92487ca	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
idinor	0:dcf3c92487ca	94	struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
idinor	0:dcf3c92487ca	95	&tcp_active_pcbs, &tcp_tw_pcbs};
idinor	0:dcf3c92487ca	96
idinor	0:dcf3c92487ca	97	/** Only used for temporary storage. */
idinor	0:dcf3c92487ca	98	struct tcp_pcb *tcp_tmp_pcb;
idinor	0:dcf3c92487ca	99
idinor	0:dcf3c92487ca	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
idinor	0:dcf3c92487ca	101	static u8_t tcp_timer;
idinor	0:dcf3c92487ca	102	static u16_t tcp_new_port(void);
idinor	0:dcf3c92487ca	103
idinor	0:dcf3c92487ca	104	/**
idinor	0:dcf3c92487ca	105	* Called periodically to dispatch TCP timers.
idinor	0:dcf3c92487ca	106	*
idinor	0:dcf3c92487ca	107	*/
idinor	0:dcf3c92487ca	108	void
idinor	0:dcf3c92487ca	109	tcp_tmr(void)
idinor	0:dcf3c92487ca	110	{
idinor	0:dcf3c92487ca	111	/* Call tcp_fasttmr() every 250 ms */
idinor	0:dcf3c92487ca	112	tcp_fasttmr();
idinor	0:dcf3c92487ca	113
idinor	0:dcf3c92487ca	114	if (++tcp_timer & 1) {
idinor	0:dcf3c92487ca	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
idinor	0:dcf3c92487ca	116	tcp_tmr() is called. */
idinor	0:dcf3c92487ca	117	tcp_slowtmr();
idinor	0:dcf3c92487ca	118	}
idinor	0:dcf3c92487ca	119	}
idinor	0:dcf3c92487ca	120
idinor	0:dcf3c92487ca	121	/**
idinor	0:dcf3c92487ca	122	* Closes the TX side of a connection held by the PCB.
idinor	0:dcf3c92487ca	123	* For tcp_close(), a RST is sent if the application didn't receive all data
idinor	0:dcf3c92487ca	124	* (tcp_recved() not called for all data passed to recv callback).
idinor	0:dcf3c92487ca	125	*
idinor	0:dcf3c92487ca	126	* Listening pcbs are freed and may not be referenced any more.
idinor	0:dcf3c92487ca	127	* Connection pcbs are freed if not yet connected and may not be referenced
idinor	0:dcf3c92487ca	128	* any more. If a connection is established (at least SYN received or in
idinor	0:dcf3c92487ca	129	* a closing state), the connection is closed, and put in a closing state.
idinor	0:dcf3c92487ca	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
idinor	0:dcf3c92487ca	131	* unsafe to reference it.
idinor	0:dcf3c92487ca	132	*
idinor	0:dcf3c92487ca	133	* @param pcb the tcp_pcb to close
idinor	0:dcf3c92487ca	134	* @return ERR_OK if connection has been closed
idinor	0:dcf3c92487ca	135	* another err_t if closing failed and pcb is not freed
idinor	0:dcf3c92487ca	136	*/
idinor	0:dcf3c92487ca	137	static err_t
idinor	0:dcf3c92487ca	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
idinor	0:dcf3c92487ca	139	{
idinor	0:dcf3c92487ca	140	err_t err;
idinor	0:dcf3c92487ca	141
idinor	0:dcf3c92487ca	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
idinor	0:dcf3c92487ca	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
idinor	0:dcf3c92487ca	144	/* Not all data received by application, send RST to tell the remote
idinor	0:dcf3c92487ca	145	side about this. */
idinor	0:dcf3c92487ca	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
idinor	0:dcf3c92487ca	147
idinor	0:dcf3c92487ca	148	/* don't call tcp_abort here: we must not deallocate the pcb since
idinor	0:dcf3c92487ca	149	that might not be expected when calling tcp_close */
idinor	0:dcf3c92487ca	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
idinor	0:dcf3c92487ca	151	pcb->local_port, pcb->remote_port);
idinor	0:dcf3c92487ca	152
idinor	0:dcf3c92487ca	153	tcp_pcb_purge(pcb);
idinor	0:dcf3c92487ca	154
idinor	0:dcf3c92487ca	155	/* TODO: to which state do we move now? */
idinor	0:dcf3c92487ca	156
idinor	0:dcf3c92487ca	157	/* move to TIME_WAIT since we close actively */
idinor	0:dcf3c92487ca	158	TCP_RMV(&tcp_active_pcbs, pcb);
idinor	0:dcf3c92487ca	159	pcb->state = TIME_WAIT;
idinor	0:dcf3c92487ca	160	TCP_REG(&tcp_tw_pcbs, pcb);
idinor	0:dcf3c92487ca	161
idinor	0:dcf3c92487ca	162	return ERR_OK;
idinor	0:dcf3c92487ca	163	}
idinor	0:dcf3c92487ca	164	}
idinor	0:dcf3c92487ca	165
idinor	0:dcf3c92487ca	166	switch (pcb->state) {
idinor	0:dcf3c92487ca	167	case CLOSED:
idinor	0:dcf3c92487ca	168	/* Closing a pcb in the CLOSED state might seem erroneous,
idinor	0:dcf3c92487ca	169	* however, it is in this state once allocated and as yet unused
idinor	0:dcf3c92487ca	170	* and the user needs some way to free it should the need arise.
idinor	0:dcf3c92487ca	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
idinor	0:dcf3c92487ca	172	* or for a pcb that has been used and then entered the CLOSED state
idinor	0:dcf3c92487ca	173	* is erroneous, but this should never happen as the pcb has in those cases
idinor	0:dcf3c92487ca	174	* been freed, and so any remaining handles are bogus. */
idinor	0:dcf3c92487ca	175	err = ERR_OK;
idinor	0:dcf3c92487ca	176	TCP_RMV(&tcp_bound_pcbs, pcb);
idinor	0:dcf3c92487ca	177	memp_free(MEMP_TCP_PCB, pcb);
idinor	0:dcf3c92487ca	178	pcb = NULL;
idinor	0:dcf3c92487ca	179	break;
idinor	0:dcf3c92487ca	180	case LISTEN:
idinor	0:dcf3c92487ca	181	err = ERR_OK;
idinor	0:dcf3c92487ca	182	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
idinor	0:dcf3c92487ca	183	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
idinor	0:dcf3c92487ca	184	pcb = NULL;
idinor	0:dcf3c92487ca	185	break;
idinor	0:dcf3c92487ca	186	case SYN_SENT:
idinor	0:dcf3c92487ca	187	err = ERR_OK;
idinor	0:dcf3c92487ca	188	tcp_pcb_remove(&tcp_active_pcbs, pcb);
idinor	0:dcf3c92487ca	189	memp_free(MEMP_TCP_PCB, pcb);
idinor	0:dcf3c92487ca	190	pcb = NULL;
idinor	0:dcf3c92487ca	191	snmp_inc_tcpattemptfails();
idinor	0:dcf3c92487ca	192	break;
idinor	0:dcf3c92487ca	193	case SYN_RCVD:
idinor	0:dcf3c92487ca	194	err = tcp_send_fin(pcb);
idinor	0:dcf3c92487ca	195	if (err == ERR_OK) {
idinor	0:dcf3c92487ca	196	snmp_inc_tcpattemptfails();
idinor	0:dcf3c92487ca	197	pcb->state = FIN_WAIT_1;
idinor	0:dcf3c92487ca	198	}
idinor	0:dcf3c92487ca	199	break;
idinor	0:dcf3c92487ca	200	case ESTABLISHED:
idinor	0:dcf3c92487ca	201	err = tcp_send_fin(pcb);
idinor	0:dcf3c92487ca	202	if (err == ERR_OK) {
idinor	0:dcf3c92487ca	203	snmp_inc_tcpestabresets();
idinor	0:dcf3c92487ca	204	pcb->state = FIN_WAIT_1;
idinor	0:dcf3c92487ca	205	}
idinor	0:dcf3c92487ca	206	break;
idinor	0:dcf3c92487ca	207	case CLOSE_WAIT:
idinor	0:dcf3c92487ca	208	err = tcp_send_fin(pcb);
idinor	0:dcf3c92487ca	209	if (err == ERR_OK) {
idinor	0:dcf3c92487ca	210	snmp_inc_tcpestabresets();
idinor	0:dcf3c92487ca	211	pcb->state = LAST_ACK;
idinor	0:dcf3c92487ca	212	}
idinor	0:dcf3c92487ca	213	break;
idinor	0:dcf3c92487ca	214	default:
idinor	0:dcf3c92487ca	215	/* Has already been closed, do nothing. */
idinor	0:dcf3c92487ca	216	err = ERR_OK;
idinor	0:dcf3c92487ca	217	pcb = NULL;
idinor	0:dcf3c92487ca	218	break;
idinor	0:dcf3c92487ca	219	}
idinor	0:dcf3c92487ca	220
idinor	0:dcf3c92487ca	221	if (pcb != NULL && err == ERR_OK) {
idinor	0:dcf3c92487ca	222	/* To ensure all data has been sent when tcp_close returns, we have
idinor	0:dcf3c92487ca	223	to make sure tcp_output doesn't fail.
idinor	0:dcf3c92487ca	224	Since we don't really have to ensure all data has been sent when tcp_close
idinor	0:dcf3c92487ca	225	returns (unsent data is sent from tcp timer functions, also), we don't care
idinor	0:dcf3c92487ca	226	for the return value of tcp_output for now. */
idinor	0:dcf3c92487ca	227	/* @todo: When implementing SO_LINGER, this must be changed somehow:
idinor	0:dcf3c92487ca	228	If SOF_LINGER is set, the data should be sent and acked before close returns.
idinor	0:dcf3c92487ca	229	This can only be valid for sequential APIs, not for the raw API. */
idinor	0:dcf3c92487ca	230	tcp_output(pcb);
idinor	0:dcf3c92487ca	231	}
idinor	0:dcf3c92487ca	232	return err;
idinor	0:dcf3c92487ca	233	}
idinor	0:dcf3c92487ca	234
idinor	0:dcf3c92487ca	235	/**
idinor	0:dcf3c92487ca	236	* Closes the connection held by the PCB.
idinor	0:dcf3c92487ca	237	*
idinor	0:dcf3c92487ca	238	* Listening pcbs are freed and may not be referenced any more.
idinor	0:dcf3c92487ca	239	* Connection pcbs are freed if not yet connected and may not be referenced
idinor	0:dcf3c92487ca	240	* any more. If a connection is established (at least SYN received or in
idinor	0:dcf3c92487ca	241	* a closing state), the connection is closed, and put in a closing state.
idinor	0:dcf3c92487ca	242	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
idinor	0:dcf3c92487ca	243	* unsafe to reference it (unless an error is returned).
idinor	0:dcf3c92487ca	244	*
idinor	0:dcf3c92487ca	245	* @param pcb the tcp_pcb to close
idinor	0:dcf3c92487ca	246	* @return ERR_OK if connection has been closed
idinor	0:dcf3c92487ca	247	* another err_t if closing failed and pcb is not freed
idinor	0:dcf3c92487ca	248	*/
idinor	0:dcf3c92487ca	249	err_t
idinor	0:dcf3c92487ca	250	tcp_close(struct tcp_pcb *pcb)
idinor	0:dcf3c92487ca	251	{
idinor	0:dcf3c92487ca	252	#if TCP_DEBUG
idinor	0:dcf3c92487ca	253	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
idinor	0:dcf3c92487ca	254	tcp_debug_print_state(pcb->state);
idinor	0:dcf3c92487ca	255	#endif /* TCP_DEBUG */
idinor	0:dcf3c92487ca	256
idinor	0:dcf3c92487ca	257	if (pcb->state != LISTEN) {
idinor	0:dcf3c92487ca	258	/* Set a flag not to receive any more data... */
idinor	0:dcf3c92487ca	259	pcb->flags \|= TF_RXCLOSED;
idinor	0:dcf3c92487ca	260	}
idinor	0:dcf3c92487ca	261	/* ... and close */
idinor	0:dcf3c92487ca	262	return tcp_close_shutdown(pcb, 1);
idinor	0:dcf3c92487ca	263	}
idinor	0:dcf3c92487ca	264
idinor	0:dcf3c92487ca	265	/**
idinor	0:dcf3c92487ca	266	* Causes all or part of a full-duplex connection of this PCB to be shut down.
idinor	0:dcf3c92487ca	267	* This doesn't deallocate the PCB!
idinor	0:dcf3c92487ca	268	*
idinor	0:dcf3c92487ca	269	* @param pcb PCB to shutdown
idinor	0:dcf3c92487ca	270	* @param shut_rx shut down receive side if this is != 0
idinor	0:dcf3c92487ca	271	* @param shut_tx shut down send side if this is != 0
idinor	0:dcf3c92487ca	272	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
idinor	0:dcf3c92487ca	273	* another err_t on error.
idinor	0:dcf3c92487ca	274	*/
idinor	0:dcf3c92487ca	275	err_t
idinor	0:dcf3c92487ca	276	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
idinor	0:dcf3c92487ca	277	{
idinor	0:dcf3c92487ca	278	if (pcb->state == LISTEN) {
idinor	0:dcf3c92487ca	279	return ERR_CONN;
idinor	0:dcf3c92487ca	280	}
idinor	0:dcf3c92487ca	281	if (shut_rx) {
idinor	0:dcf3c92487ca	282	/* shut down the receive side: free buffered data... */
idinor	0:dcf3c92487ca	283	if (pcb->refused_data != NULL) {
idinor	0:dcf3c92487ca	284	pbuf_free(pcb->refused_data);
idinor	0:dcf3c92487ca	285	pcb->refused_data = NULL;
idinor	0:dcf3c92487ca	286	}
idinor	0:dcf3c92487ca	287	/* ... and set a flag not to receive any more data */
idinor	0:dcf3c92487ca	288	pcb->flags \|= TF_RXCLOSED;
idinor	0:dcf3c92487ca	289	}
idinor	0:dcf3c92487ca	290	if (shut_tx) {
idinor	0:dcf3c92487ca	291	/* This can't happen twice since if it succeeds, the pcb's state is changed.
idinor	0:dcf3c92487ca	292	Only close in these states as the others directly deallocate the PCB */
idinor	0:dcf3c92487ca	293	switch (pcb->state) {
idinor	0:dcf3c92487ca	294	case SYN_RCVD:
idinor	0:dcf3c92487ca	295	case ESTABLISHED:
idinor	0:dcf3c92487ca	296	case CLOSE_WAIT:
idinor	0:dcf3c92487ca	297	return tcp_close_shutdown(pcb, 0);
idinor	0:dcf3c92487ca	298	default:
idinor	0:dcf3c92487ca	299	/* don't shut down other states */
idinor	0:dcf3c92487ca	300	break;
idinor	0:dcf3c92487ca	301	}
idinor	0:dcf3c92487ca	302	}
idinor	0:dcf3c92487ca	303	/* @todo: return another err_t if not in correct state or already shut? */
idinor	0:dcf3c92487ca	304	return ERR_OK;
idinor	0:dcf3c92487ca	305	}
idinor	0:dcf3c92487ca	306
idinor	0:dcf3c92487ca	307	/**
idinor	0:dcf3c92487ca	308	* Abandons a connection and optionally sends a RST to the remote
idinor	0:dcf3c92487ca	309	* host. Deletes the local protocol control block. This is done when
idinor	0:dcf3c92487ca	310	* a connection is killed because of shortage of memory.
idinor	0:dcf3c92487ca	311	*
idinor	0:dcf3c92487ca	312	* @param pcb the tcp_pcb to abort
idinor	0:dcf3c92487ca	313	* @param reset boolean to indicate whether a reset should be sent
idinor	0:dcf3c92487ca	314	*/
idinor	0:dcf3c92487ca	315	void
idinor	0:dcf3c92487ca	316	tcp_abandon(struct tcp_pcb *pcb, int reset)
idinor	0:dcf3c92487ca	317	{
idinor	0:dcf3c92487ca	318	u32_t seqno, ackno;
idinor	0:dcf3c92487ca	319	u16_t remote_port, local_port;
idinor	0:dcf3c92487ca	320	ip_addr_t remote_ip, local_ip;
idinor	0:dcf3c92487ca	321	#if LWIP_CALLBACK_API
idinor	0:dcf3c92487ca	322	tcp_err_fn errf;
idinor	0:dcf3c92487ca	323	#endif /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	324	void *errf_arg;
idinor	0:dcf3c92487ca	325
idinor	0:dcf3c92487ca	326	/* pcb->state LISTEN not allowed here */
idinor	0:dcf3c92487ca	327	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
idinor	0:dcf3c92487ca	328	pcb->state != LISTEN);
idinor	0:dcf3c92487ca	329	/* Figure out on which TCP PCB list we are, and remove us. If we
idinor	0:dcf3c92487ca	330	are in an active state, call the receive function associated with
idinor	0:dcf3c92487ca	331	the PCB with a NULL argument, and send an RST to the remote end. */
idinor	0:dcf3c92487ca	332	if (pcb->state == TIME_WAIT) {
idinor	0:dcf3c92487ca	333	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
idinor	0:dcf3c92487ca	334	memp_free(MEMP_TCP_PCB, pcb);
idinor	0:dcf3c92487ca	335	} else {
idinor	0:dcf3c92487ca	336	seqno = pcb->snd_nxt;
idinor	0:dcf3c92487ca	337	ackno = pcb->rcv_nxt;
idinor	0:dcf3c92487ca	338	ip_addr_copy(local_ip, pcb->local_ip);
idinor	0:dcf3c92487ca	339	ip_addr_copy(remote_ip, pcb->remote_ip);
idinor	0:dcf3c92487ca	340	local_port = pcb->local_port;
idinor	0:dcf3c92487ca	341	remote_port = pcb->remote_port;
idinor	0:dcf3c92487ca	342	#if LWIP_CALLBACK_API
idinor	0:dcf3c92487ca	343	errf = pcb->errf;
idinor	0:dcf3c92487ca	344	#endif /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	345	errf_arg = pcb->callback_arg;
idinor	0:dcf3c92487ca	346	tcp_pcb_remove(&tcp_active_pcbs, pcb);
idinor	0:dcf3c92487ca	347	if (pcb->unacked != NULL) {
idinor	0:dcf3c92487ca	348	tcp_segs_free(pcb->unacked);
idinor	0:dcf3c92487ca	349	}
idinor	0:dcf3c92487ca	350	if (pcb->unsent != NULL) {
idinor	0:dcf3c92487ca	351	tcp_segs_free(pcb->unsent);
idinor	0:dcf3c92487ca	352	}
idinor	0:dcf3c92487ca	353	#if TCP_QUEUE_OOSEQ
idinor	0:dcf3c92487ca	354	if (pcb->ooseq != NULL) {
idinor	0:dcf3c92487ca	355	tcp_segs_free(pcb->ooseq);
idinor	0:dcf3c92487ca	356	}
idinor	0:dcf3c92487ca	357	#endif /* TCP_QUEUE_OOSEQ */
idinor	0:dcf3c92487ca	358	memp_free(MEMP_TCP_PCB, pcb);
idinor	0:dcf3c92487ca	359	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
idinor	0:dcf3c92487ca	360	if (reset) {
idinor	0:dcf3c92487ca	361	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
idinor	0:dcf3c92487ca	362	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
idinor	0:dcf3c92487ca	363	}
idinor	0:dcf3c92487ca	364	}
idinor	0:dcf3c92487ca	365	}
idinor	0:dcf3c92487ca	366
idinor	0:dcf3c92487ca	367	/**
idinor	0:dcf3c92487ca	368	* Aborts the connection by sending a RST (reset) segment to the remote
idinor	0:dcf3c92487ca	369	* host. The pcb is deallocated. This function never fails.
idinor	0:dcf3c92487ca	370	*
idinor	0:dcf3c92487ca	371	* ATTENTION: When calling this from one of the TCP callbacks, make
idinor	0:dcf3c92487ca	372	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
idinor	0:dcf3c92487ca	373	* or you will risk accessing deallocated memory or memory leaks!
idinor	0:dcf3c92487ca	374	*
idinor	0:dcf3c92487ca	375	* @param pcb the tcp pcb to abort
idinor	0:dcf3c92487ca	376	*/
idinor	0:dcf3c92487ca	377	void
idinor	0:dcf3c92487ca	378	tcp_abort(struct tcp_pcb *pcb)
idinor	0:dcf3c92487ca	379	{
idinor	0:dcf3c92487ca	380	tcp_abandon(pcb, 1);
idinor	0:dcf3c92487ca	381	}
idinor	0:dcf3c92487ca	382
idinor	0:dcf3c92487ca	383	/**
idinor	0:dcf3c92487ca	384	* Binds the connection to a local portnumber and IP address. If the
idinor	0:dcf3c92487ca	385	* IP address is not given (i.e., ipaddr == NULL), the IP address of
idinor	0:dcf3c92487ca	386	* the outgoing network interface is used instead.
idinor	0:dcf3c92487ca	387	*
idinor	0:dcf3c92487ca	388	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
idinor	0:dcf3c92487ca	389	* already bound!)
idinor	0:dcf3c92487ca	390	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
idinor	0:dcf3c92487ca	391	* to any local address
idinor	0:dcf3c92487ca	392	* @param port the local port to bind to
idinor	0:dcf3c92487ca	393	* @return ERR_USE if the port is already in use
idinor	0:dcf3c92487ca	394	* ERR_OK if bound
idinor	0:dcf3c92487ca	395	*/
idinor	0:dcf3c92487ca	396	err_t
idinor	0:dcf3c92487ca	397	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
idinor	0:dcf3c92487ca	398	{
idinor	0:dcf3c92487ca	399	int i;
idinor	0:dcf3c92487ca	400	int max_pcb_list = NUM_TCP_PCB_LISTS;
idinor	0:dcf3c92487ca	401	struct tcp_pcb *cpcb;
idinor	0:dcf3c92487ca	402
idinor	0:dcf3c92487ca	403	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
idinor	0:dcf3c92487ca	404
idinor	0:dcf3c92487ca	405	#if SO_REUSE
idinor	0:dcf3c92487ca	406	/* Unless the REUSEADDR flag is set,
idinor	0:dcf3c92487ca	407	we have to check the pcbs in TIME-WAIT state, also.
idinor	0:dcf3c92487ca	408	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
idinor	0:dcf3c92487ca	409	packets using both local and remote IP addresses and ports to distinguish.
idinor	0:dcf3c92487ca	410	*/
idinor	0:dcf3c92487ca	411	#if SO_REUSE
idinor	0:dcf3c92487ca	412	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
idinor	0:dcf3c92487ca	413	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
idinor	0:dcf3c92487ca	414	}
idinor	0:dcf3c92487ca	415	#endif /* SO_REUSE */
idinor	0:dcf3c92487ca	416	#endif /* SO_REUSE */
idinor	0:dcf3c92487ca	417
idinor	0:dcf3c92487ca	418	if (port == 0) {
idinor	0:dcf3c92487ca	419	port = tcp_new_port();
idinor	0:dcf3c92487ca	420	}
idinor	0:dcf3c92487ca	421
idinor	0:dcf3c92487ca	422	/* Check if the address already is in use (on all lists) */
idinor	0:dcf3c92487ca	423	for (i = 0; i < max_pcb_list; i++) {
idinor	0:dcf3c92487ca	424	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
idinor	0:dcf3c92487ca	425	if (cpcb->local_port == port) {
idinor	0:dcf3c92487ca	426	#if SO_REUSE
idinor	0:dcf3c92487ca	427	/* Omit checking for the same port if both pcbs have REUSEADDR set.
idinor	0:dcf3c92487ca	428	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
idinor	0:dcf3c92487ca	429	tcp_connect. */
idinor	0:dcf3c92487ca	430	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
idinor	0:dcf3c92487ca	431	((cpcb->so_options & SOF_REUSEADDR) == 0))
idinor	0:dcf3c92487ca	432	#endif /* SO_REUSE */
idinor	0:dcf3c92487ca	433	{
idinor	0:dcf3c92487ca	434	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
idinor	0:dcf3c92487ca	435	ip_addr_isany(ipaddr) \|\|
idinor	0:dcf3c92487ca	436	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
idinor	0:dcf3c92487ca	437	return ERR_USE;
idinor	0:dcf3c92487ca	438	}
idinor	0:dcf3c92487ca	439	}
idinor	0:dcf3c92487ca	440	}
idinor	0:dcf3c92487ca	441	}
idinor	0:dcf3c92487ca	442	}
idinor	0:dcf3c92487ca	443
idinor	0:dcf3c92487ca	444	if (!ip_addr_isany(ipaddr)) {
idinor	0:dcf3c92487ca	445	pcb->local_ip = *ipaddr;
idinor	0:dcf3c92487ca	446	}
idinor	0:dcf3c92487ca	447	pcb->local_port = port;
idinor	0:dcf3c92487ca	448	TCP_REG(&tcp_bound_pcbs, pcb);
idinor	0:dcf3c92487ca	449	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
idinor	0:dcf3c92487ca	450	return ERR_OK;
idinor	0:dcf3c92487ca	451	}
idinor	0:dcf3c92487ca	452	#if LWIP_CALLBACK_API
idinor	0:dcf3c92487ca	453	/**
idinor	0:dcf3c92487ca	454	* Default accept callback if no accept callback is specified by the user.
idinor	0:dcf3c92487ca	455	*/
idinor	0:dcf3c92487ca	456	static err_t
idinor	0:dcf3c92487ca	457	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
idinor	0:dcf3c92487ca	458	{
idinor	0:dcf3c92487ca	459	LWIP_UNUSED_ARG(arg);
idinor	0:dcf3c92487ca	460	LWIP_UNUSED_ARG(pcb);
idinor	0:dcf3c92487ca	461	LWIP_UNUSED_ARG(err);
idinor	0:dcf3c92487ca	462
idinor	0:dcf3c92487ca	463	return ERR_ABRT;
idinor	0:dcf3c92487ca	464	}
idinor	0:dcf3c92487ca	465	#endif /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	466
idinor	0:dcf3c92487ca	467	/**
idinor	0:dcf3c92487ca	468	* Set the state of the connection to be LISTEN, which means that it
idinor	0:dcf3c92487ca	469	* is able to accept incoming connections. The protocol control block
idinor	0:dcf3c92487ca	470	* is reallocated in order to consume less memory. Setting the
idinor	0:dcf3c92487ca	471	* connection to LISTEN is an irreversible process.
idinor	0:dcf3c92487ca	472	*
idinor	0:dcf3c92487ca	473	* @param pcb the original tcp_pcb
idinor	0:dcf3c92487ca	474	* @param backlog the incoming connections queue limit
idinor	0:dcf3c92487ca	475	* @return tcp_pcb used for listening, consumes less memory.
idinor	0:dcf3c92487ca	476	*
idinor	0:dcf3c92487ca	477	* @note The original tcp_pcb is freed. This function therefore has to be
idinor	0:dcf3c92487ca	478	* called like this:
idinor	0:dcf3c92487ca	479	* tpcb = tcp_listen(tpcb);
idinor	0:dcf3c92487ca	480	*/
idinor	0:dcf3c92487ca	481	struct tcp_pcb *
idinor	0:dcf3c92487ca	482	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
idinor	0:dcf3c92487ca	483	{
idinor	0:dcf3c92487ca	484	struct tcp_pcb_listen *lpcb;
idinor	0:dcf3c92487ca	485
idinor	0:dcf3c92487ca	486	LWIP_UNUSED_ARG(backlog);
idinor	0:dcf3c92487ca	487	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
idinor	0:dcf3c92487ca	488
idinor	0:dcf3c92487ca	489	/* already listening? */
idinor	0:dcf3c92487ca	490	if (pcb->state == LISTEN) {
idinor	0:dcf3c92487ca	491	return pcb;
idinor	0:dcf3c92487ca	492	}
idinor	0:dcf3c92487ca	493	#if SO_REUSE
idinor	0:dcf3c92487ca	494	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
idinor	0:dcf3c92487ca	495	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
idinor	0:dcf3c92487ca	496	is declared (listen-/connection-pcb), we have to make sure now that
idinor	0:dcf3c92487ca	497	this port is only used once for every local IP. */
idinor	0:dcf3c92487ca	498	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
idinor	0:dcf3c92487ca	499	if (lpcb->local_port == pcb->local_port) {
idinor	0:dcf3c92487ca	500	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
idinor	0:dcf3c92487ca	501	/* this address/port is already used */
idinor	0:dcf3c92487ca	502	return NULL;
idinor	0:dcf3c92487ca	503	}
idinor	0:dcf3c92487ca	504	}
idinor	0:dcf3c92487ca	505	}
idinor	0:dcf3c92487ca	506	}
idinor	0:dcf3c92487ca	507	#endif /* SO_REUSE */
idinor	0:dcf3c92487ca	508	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
idinor	0:dcf3c92487ca	509	if (lpcb == NULL) {
idinor	0:dcf3c92487ca	510	return NULL;
idinor	0:dcf3c92487ca	511	}
idinor	0:dcf3c92487ca	512	lpcb->callback_arg = pcb->callback_arg;
idinor	0:dcf3c92487ca	513	lpcb->local_port = pcb->local_port;
idinor	0:dcf3c92487ca	514	lpcb->state = LISTEN;
idinor	0:dcf3c92487ca	515	lpcb->prio = pcb->prio;
idinor	0:dcf3c92487ca	516	lpcb->so_options = pcb->so_options;
idinor	0:dcf3c92487ca	517	lpcb->so_options \|= SOF_ACCEPTCONN;
idinor	0:dcf3c92487ca	518	lpcb->ttl = pcb->ttl;
idinor	0:dcf3c92487ca	519	lpcb->tos = pcb->tos;
idinor	0:dcf3c92487ca	520	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
idinor	0:dcf3c92487ca	521	TCP_RMV(&tcp_bound_pcbs, pcb);
idinor	0:dcf3c92487ca	522	memp_free(MEMP_TCP_PCB, pcb);
idinor	0:dcf3c92487ca	523	#if LWIP_CALLBACK_API
idinor	0:dcf3c92487ca	524	lpcb->accept = tcp_accept_null;
idinor	0:dcf3c92487ca	525	#endif /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	526	#if TCP_LISTEN_BACKLOG
idinor	0:dcf3c92487ca	527	lpcb->accepts_pending = 0;
idinor	0:dcf3c92487ca	528	lpcb->backlog = (backlog ? backlog : 1);
idinor	0:dcf3c92487ca	529	#endif /* TCP_LISTEN_BACKLOG */
idinor	0:dcf3c92487ca	530	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
idinor	0:dcf3c92487ca	531	return (struct tcp_pcb *)lpcb;
idinor	0:dcf3c92487ca	532	}
idinor	0:dcf3c92487ca	533
idinor	0:dcf3c92487ca	534	/**
idinor	0:dcf3c92487ca	535	* Update the state that tracks the available window space to advertise.
idinor	0:dcf3c92487ca	536	*
idinor	0:dcf3c92487ca	537	* Returns how much extra window would be advertised if we sent an
idinor	0:dcf3c92487ca	538	* update now.
idinor	0:dcf3c92487ca	539	*/
idinor	0:dcf3c92487ca	540	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
idinor	0:dcf3c92487ca	541	{
idinor	0:dcf3c92487ca	542	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
idinor	0:dcf3c92487ca	543
idinor	0:dcf3c92487ca	544	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
idinor	0:dcf3c92487ca	545	/* we can advertise more window */
idinor	0:dcf3c92487ca	546	pcb->rcv_ann_wnd = pcb->rcv_wnd;
idinor	0:dcf3c92487ca	547	return new_right_edge - pcb->rcv_ann_right_edge;
idinor	0:dcf3c92487ca	548	} else {
idinor	0:dcf3c92487ca	549	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
idinor	0:dcf3c92487ca	550	/* Can happen due to other end sending out of advertised window,
idinor	0:dcf3c92487ca	551	* but within actual available (but not yet advertised) window */
idinor	0:dcf3c92487ca	552	pcb->rcv_ann_wnd = 0;
idinor	0:dcf3c92487ca	553	} else {
idinor	0:dcf3c92487ca	554	/* keep the right edge of window constant */
idinor	0:dcf3c92487ca	555	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
idinor	0:dcf3c92487ca	556	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
idinor	0:dcf3c92487ca	557	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
idinor	0:dcf3c92487ca	558	}
idinor	0:dcf3c92487ca	559	return 0;
idinor	0:dcf3c92487ca	560	}
idinor	0:dcf3c92487ca	561	}
idinor	0:dcf3c92487ca	562
idinor	0:dcf3c92487ca	563	/**
idinor	0:dcf3c92487ca	564	* This function should be called by the application when it has
idinor	0:dcf3c92487ca	565	* processed the data. The purpose is to advertise a larger window
idinor	0:dcf3c92487ca	566	* when the data has been processed.
idinor	0:dcf3c92487ca	567	*
idinor	0:dcf3c92487ca	568	* @param pcb the tcp_pcb for which data is read
idinor	0:dcf3c92487ca	569	* @param len the amount of bytes that have been read by the application
idinor	0:dcf3c92487ca	570	*/
idinor	0:dcf3c92487ca	571	void
idinor	0:dcf3c92487ca	572	tcp_recved(struct tcp_pcb *pcb, u16_t len)
idinor	0:dcf3c92487ca	573	{
idinor	0:dcf3c92487ca	574	int wnd_inflation;
idinor	0:dcf3c92487ca	575
idinor	0:dcf3c92487ca	576	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
idinor	0:dcf3c92487ca	577	len <= 0xffff - pcb->rcv_wnd );
idinor	0:dcf3c92487ca	578
idinor	0:dcf3c92487ca	579	pcb->rcv_wnd += len;
idinor	0:dcf3c92487ca	580	if (pcb->rcv_wnd > TCP_WND) {
idinor	0:dcf3c92487ca	581	pcb->rcv_wnd = TCP_WND;
idinor	0:dcf3c92487ca	582	}
idinor	0:dcf3c92487ca	583
idinor	0:dcf3c92487ca	584	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
idinor	0:dcf3c92487ca	585
idinor	0:dcf3c92487ca	586	/* If the change in the right edge of window is significant (default
idinor	0:dcf3c92487ca	587	* watermark is TCP_WND/4), then send an explicit update now.
idinor	0:dcf3c92487ca	588	* Otherwise wait for a packet to be sent in the normal course of
idinor	0:dcf3c92487ca	589	* events (or more window to be available later) */
idinor	0:dcf3c92487ca	590	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
idinor	0:dcf3c92487ca	591	tcp_ack_now(pcb);
idinor	0:dcf3c92487ca	592	tcp_output(pcb);
idinor	0:dcf3c92487ca	593	}
idinor	0:dcf3c92487ca	594
idinor	0:dcf3c92487ca	595	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
idinor	0:dcf3c92487ca	596	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
idinor	0:dcf3c92487ca	597	}
idinor	0:dcf3c92487ca	598
idinor	0:dcf3c92487ca	599	/**
idinor	0:dcf3c92487ca	600	* A nastly hack featuring 'goto' statements that allocates a
idinor	0:dcf3c92487ca	601	* new TCP local port.
idinor	0:dcf3c92487ca	602	*
idinor	0:dcf3c92487ca	603	* @return a new (free) local TCP port number
idinor	0:dcf3c92487ca	604	*/
idinor	0:dcf3c92487ca	605	static u16_t
idinor	0:dcf3c92487ca	606	tcp_new_port(void)
idinor	0:dcf3c92487ca	607	{
idinor	0:dcf3c92487ca	608	int i;
idinor	0:dcf3c92487ca	609	struct tcp_pcb *pcb;
idinor	0:dcf3c92487ca	610	#ifndef TCP_LOCAL_PORT_RANGE_START
idinor	0:dcf3c92487ca	611	#define TCP_LOCAL_PORT_RANGE_START 4096
idinor	0:dcf3c92487ca	612	#define TCP_LOCAL_PORT_RANGE_END 0x7fff
idinor	0:dcf3c92487ca	613	#endif
idinor	0:dcf3c92487ca	614	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
idinor	0:dcf3c92487ca	615
idinor	0:dcf3c92487ca	616	again:
idinor	0:dcf3c92487ca	617	if (++port > TCP_LOCAL_PORT_RANGE_END) {
idinor	0:dcf3c92487ca	618	port = TCP_LOCAL_PORT_RANGE_START;
idinor	0:dcf3c92487ca	619	}
idinor	0:dcf3c92487ca	620	/* Check all PCB lists. */
idinor	0:dcf3c92487ca	621	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
idinor	0:dcf3c92487ca	622	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
idinor	0:dcf3c92487ca	623	if (pcb->local_port == port) {
idinor	0:dcf3c92487ca	624	goto again;
idinor	0:dcf3c92487ca	625	}
idinor	0:dcf3c92487ca	626	}
idinor	0:dcf3c92487ca	627	}
idinor	0:dcf3c92487ca	628	return port;
idinor	0:dcf3c92487ca	629	}
idinor	0:dcf3c92487ca	630
idinor	0:dcf3c92487ca	631	/**
idinor	0:dcf3c92487ca	632	* Connects to another host. The function given as the "connected"
idinor	0:dcf3c92487ca	633	* argument will be called when the connection has been established.
idinor	0:dcf3c92487ca	634	*
idinor	0:dcf3c92487ca	635	* @param pcb the tcp_pcb used to establish the connection
idinor	0:dcf3c92487ca	636	* @param ipaddr the remote ip address to connect to
idinor	0:dcf3c92487ca	637	* @param port the remote tcp port to connect to
idinor	0:dcf3c92487ca	638	* @param connected callback function to call when connected (or on error)
idinor	0:dcf3c92487ca	639	* @return ERR_VAL if invalid arguments are given
idinor	0:dcf3c92487ca	640	* ERR_OK if connect request has been sent
idinor	0:dcf3c92487ca	641	* other err_t values if connect request couldn't be sent
idinor	0:dcf3c92487ca	642	*/
idinor	0:dcf3c92487ca	643	err_t
idinor	0:dcf3c92487ca	644	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
idinor	0:dcf3c92487ca	645	tcp_connected_fn connected)
idinor	0:dcf3c92487ca	646	{
idinor	0:dcf3c92487ca	647	err_t ret;
idinor	0:dcf3c92487ca	648	u32_t iss;
idinor	0:dcf3c92487ca	649
idinor	0:dcf3c92487ca	650	LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
idinor	0:dcf3c92487ca	651
idinor	0:dcf3c92487ca	652	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
idinor	0:dcf3c92487ca	653	if (ipaddr != NULL) {
idinor	0:dcf3c92487ca	654	pcb->remote_ip = *ipaddr;
idinor	0:dcf3c92487ca	655	} else {
idinor	0:dcf3c92487ca	656	return ERR_VAL;
idinor	0:dcf3c92487ca	657	}
idinor	0:dcf3c92487ca	658	pcb->remote_port = port;
idinor	0:dcf3c92487ca	659
idinor	0:dcf3c92487ca	660	/* check if we have a route to the remote host */
idinor	0:dcf3c92487ca	661	if (ip_addr_isany(&(pcb->local_ip))) {
idinor	0:dcf3c92487ca	662	/* no local IP address set, yet. */
idinor	0:dcf3c92487ca	663	struct netif *netif = ip_route(&(pcb->remote_ip));
idinor	0:dcf3c92487ca	664	if (netif == NULL) {
idinor	0:dcf3c92487ca	665	/* Don't even try to send a SYN packet if we have no route
idinor	0:dcf3c92487ca	666	since that will fail. */
idinor	0:dcf3c92487ca	667	return ERR_RTE;
idinor	0:dcf3c92487ca	668	}
idinor	0:dcf3c92487ca	669	/* Use the netif's IP address as local address. */
idinor	0:dcf3c92487ca	670	ip_addr_copy(pcb->local_ip, netif->ip_addr);
idinor	0:dcf3c92487ca	671	}
idinor	0:dcf3c92487ca	672
idinor	0:dcf3c92487ca	673	if (pcb->local_port == 0) {
idinor	0:dcf3c92487ca	674	pcb->local_port = tcp_new_port();
idinor	0:dcf3c92487ca	675	}
idinor	0:dcf3c92487ca	676	#if SO_REUSE
idinor	0:dcf3c92487ca	677	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
idinor	0:dcf3c92487ca	678	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
idinor	0:dcf3c92487ca	679	now that the 5-tuple is unique. */
idinor	0:dcf3c92487ca	680	struct tcp_pcb *cpcb;
idinor	0:dcf3c92487ca	681	int i;
idinor	0:dcf3c92487ca	682	/* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
idinor	0:dcf3c92487ca	683	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
idinor	0:dcf3c92487ca	684	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
idinor	0:dcf3c92487ca	685	if ((cpcb->local_port == pcb->local_port) &&
idinor	0:dcf3c92487ca	686	(cpcb->remote_port == port) &&
idinor	0:dcf3c92487ca	687	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
idinor	0:dcf3c92487ca	688	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
idinor	0:dcf3c92487ca	689	/* linux returns EISCONN here, but ERR_USE should be OK for us */
idinor	0:dcf3c92487ca	690	return ERR_USE;
idinor	0:dcf3c92487ca	691	}
idinor	0:dcf3c92487ca	692	}
idinor	0:dcf3c92487ca	693	}
idinor	0:dcf3c92487ca	694	}
idinor	0:dcf3c92487ca	695	#endif /* SO_REUSE */
idinor	0:dcf3c92487ca	696	iss = tcp_next_iss();
idinor	0:dcf3c92487ca	697	pcb->rcv_nxt = 0;
idinor	0:dcf3c92487ca	698	pcb->snd_nxt = iss;
idinor	0:dcf3c92487ca	699	pcb->lastack = iss - 1;
idinor	0:dcf3c92487ca	700	pcb->snd_lbb = iss - 1;
idinor	0:dcf3c92487ca	701	pcb->rcv_wnd = TCP_WND;
idinor	0:dcf3c92487ca	702	pcb->rcv_ann_wnd = TCP_WND;
idinor	0:dcf3c92487ca	703	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
idinor	0:dcf3c92487ca	704	pcb->snd_wnd = TCP_WND;
idinor	0:dcf3c92487ca	705	/* As initial send MSS, we use TCP_MSS but limit it to 536.
idinor	0:dcf3c92487ca	706	The send MSS is updated when an MSS option is received. */
idinor	0:dcf3c92487ca	707	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
idinor	0:dcf3c92487ca	708	#if TCP_CALCULATE_EFF_SEND_MSS
idinor	0:dcf3c92487ca	709	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
idinor	0:dcf3c92487ca	710	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
idinor	0:dcf3c92487ca	711	pcb->cwnd = 1;
idinor	0:dcf3c92487ca	712	pcb->ssthresh = pcb->mss * 10;
idinor	0:dcf3c92487ca	713	#if LWIP_CALLBACK_API
idinor	0:dcf3c92487ca	714	pcb->connected = connected;
idinor	0:dcf3c92487ca	715	#else /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	716	LWIP_UNUSED_ARG(connected);
idinor	0:dcf3c92487ca	717	#endif /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	718
idinor	0:dcf3c92487ca	719	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
idinor	0:dcf3c92487ca	720
idinor	0:dcf3c92487ca	721	/* Send a SYN together with the MSS option. */
idinor	0:dcf3c92487ca	722	ret = tcp_enqueue_flags(pcb, TCP_SYN);
idinor	0:dcf3c92487ca	723	if (ret == ERR_OK) {
idinor	0:dcf3c92487ca	724	/* SYN segment was enqueued, changed the pcbs state now */
idinor	0:dcf3c92487ca	725	pcb->state = SYN_SENT;
idinor	0:dcf3c92487ca	726	TCP_RMV(&tcp_bound_pcbs, pcb);
idinor	0:dcf3c92487ca	727	TCP_REG(&tcp_active_pcbs, pcb);
idinor	0:dcf3c92487ca	728	snmp_inc_tcpactiveopens();
idinor	0:dcf3c92487ca	729
idinor	0:dcf3c92487ca	730	tcp_output(pcb);
idinor	0:dcf3c92487ca	731	}
idinor	0:dcf3c92487ca	732	return ret;
idinor	0:dcf3c92487ca	733	}
idinor	0:dcf3c92487ca	734
idinor	0:dcf3c92487ca	735	/**
idinor	0:dcf3c92487ca	736	* Called every 500 ms and implements the retransmission timer and the timer that
idinor	0:dcf3c92487ca	737	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
idinor	0:dcf3c92487ca	738	* various timers such as the inactivity timer in each PCB.
idinor	0:dcf3c92487ca	739	*
idinor	0:dcf3c92487ca	740	* Automatically called from tcp_tmr().
idinor	0:dcf3c92487ca	741	*/
idinor	0:dcf3c92487ca	742	void
idinor	0:dcf3c92487ca	743	tcp_slowtmr(void)
idinor	0:dcf3c92487ca	744	{
idinor	0:dcf3c92487ca	745	struct tcp_pcb pcb, pcb2, *prev;
idinor	0:dcf3c92487ca	746	u16_t eff_wnd;
idinor	0:dcf3c92487ca	747	u8_t pcb_remove; /* flag if a PCB should be removed */
idinor	0:dcf3c92487ca	748	u8_t pcb_reset; /* flag if a RST should be sent when removing */
idinor	0:dcf3c92487ca	749	err_t err;
idinor	0:dcf3c92487ca	750
idinor	0:dcf3c92487ca	751	tcp_debug_print_pcbs(); //DG
idinor	0:dcf3c92487ca	752
idinor	0:dcf3c92487ca	753	err = ERR_OK;
idinor	0:dcf3c92487ca	754
idinor	0:dcf3c92487ca	755	++tcp_ticks;
idinor	0:dcf3c92487ca	756	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
idinor	0:dcf3c92487ca	757
idinor	0:dcf3c92487ca	758	/* Steps through all of the active PCBs. */
idinor	0:dcf3c92487ca	759	prev = NULL;
idinor	0:dcf3c92487ca	760	pcb = tcp_active_pcbs;
idinor	0:dcf3c92487ca	761	if (pcb == NULL) {
idinor	0:dcf3c92487ca	762	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
idinor	0:dcf3c92487ca	763	}
idinor	0:dcf3c92487ca	764	while (pcb != NULL) {
idinor	0:dcf3c92487ca	765	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
idinor	0:dcf3c92487ca	766	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
idinor	0:dcf3c92487ca	767	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
idinor	0:dcf3c92487ca	768	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
idinor	0:dcf3c92487ca	769
idinor	0:dcf3c92487ca	770	pcb_remove = 0;
idinor	0:dcf3c92487ca	771	pcb_reset = 0;
idinor	0:dcf3c92487ca	772
idinor	0:dcf3c92487ca	773	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
idinor	0:dcf3c92487ca	774	++pcb_remove;
idinor	0:dcf3c92487ca	775	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
idinor	0:dcf3c92487ca	776	}
idinor	0:dcf3c92487ca	777	else if (pcb->nrtx == TCP_MAXRTX) {
idinor	0:dcf3c92487ca	778	++pcb_remove;
idinor	0:dcf3c92487ca	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
idinor	0:dcf3c92487ca	780	} else {
idinor	0:dcf3c92487ca	781	if (pcb->persist_backoff > 0) {
idinor	0:dcf3c92487ca	782	/* If snd_wnd is zero, use persist timer to send 1 byte probes
idinor	0:dcf3c92487ca	783	* instead of using the standard retransmission mechanism. */
idinor	0:dcf3c92487ca	784	pcb->persist_cnt++;
idinor	0:dcf3c92487ca	785	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
idinor	0:dcf3c92487ca	786	pcb->persist_cnt = 0;
idinor	0:dcf3c92487ca	787	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
idinor	0:dcf3c92487ca	788	pcb->persist_backoff++;
idinor	0:dcf3c92487ca	789	}
idinor	0:dcf3c92487ca	790	tcp_zero_window_probe(pcb);
idinor	0:dcf3c92487ca	791	}
idinor	0:dcf3c92487ca	792	} else {
idinor	0:dcf3c92487ca	793	/* Increase the retransmission timer if it is running */
idinor	0:dcf3c92487ca	794	if(pcb->rtime >= 0)
idinor	0:dcf3c92487ca	795	++pcb->rtime;
idinor	0:dcf3c92487ca	796
idinor	0:dcf3c92487ca	797	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
idinor	0:dcf3c92487ca	798	/* Time for a retransmission. */
idinor	0:dcf3c92487ca	799	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
idinor	0:dcf3c92487ca	800	" pcb->rto %"S16_F"\n",
idinor	0:dcf3c92487ca	801	pcb->rtime, pcb->rto));
idinor	0:dcf3c92487ca	802
idinor	0:dcf3c92487ca	803	/* Double retransmission time-out unless we are trying to
idinor	0:dcf3c92487ca	804	* connect to somebody (i.e., we are in SYN_SENT). */
idinor	0:dcf3c92487ca	805	if (pcb->state != SYN_SENT) {
idinor	0:dcf3c92487ca	806	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
idinor	0:dcf3c92487ca	807	}
idinor	0:dcf3c92487ca	808
idinor	0:dcf3c92487ca	809	/* Reset the retransmission timer. */
idinor	0:dcf3c92487ca	810	pcb->rtime = 0;
idinor	0:dcf3c92487ca	811
idinor	0:dcf3c92487ca	812	/* Reduce congestion window and ssthresh. */
idinor	0:dcf3c92487ca	813	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
idinor	0:dcf3c92487ca	814	pcb->ssthresh = eff_wnd >> 1;
idinor	0:dcf3c92487ca	815	if (pcb->ssthresh < (pcb->mss << 1)) {
idinor	0:dcf3c92487ca	816	pcb->ssthresh = (pcb->mss << 1);
idinor	0:dcf3c92487ca	817	}
idinor	0:dcf3c92487ca	818	pcb->cwnd = pcb->mss;
idinor	0:dcf3c92487ca	819	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
idinor	0:dcf3c92487ca	820	" ssthresh %"U16_F"\n",
idinor	0:dcf3c92487ca	821	pcb->cwnd, pcb->ssthresh));
idinor	0:dcf3c92487ca	822
idinor	0:dcf3c92487ca	823	/* The following needs to be called AFTER cwnd is set to one
idinor	0:dcf3c92487ca	824	mss - STJ */
idinor	0:dcf3c92487ca	825	tcp_rexmit_rto(pcb);
idinor	0:dcf3c92487ca	826	}
idinor	0:dcf3c92487ca	827	}
idinor	0:dcf3c92487ca	828	}
idinor	0:dcf3c92487ca	829	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
idinor	0:dcf3c92487ca	830	if (pcb->state == FIN_WAIT_2) {
idinor	0:dcf3c92487ca	831	if ((u32_t)(tcp_ticks - pcb->tmr) >
idinor	0:dcf3c92487ca	832	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
idinor	0:dcf3c92487ca	833	++pcb_remove;
idinor	0:dcf3c92487ca	834	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
idinor	0:dcf3c92487ca	835	}
idinor	0:dcf3c92487ca	836	}
idinor	0:dcf3c92487ca	837
idinor	0:dcf3c92487ca	838	/* Check if KEEPALIVE should be sent */
idinor	0:dcf3c92487ca	839	if((pcb->so_options & SOF_KEEPALIVE) &&
idinor	0:dcf3c92487ca	840	((pcb->state == ESTABLISHED) \|\|
idinor	0:dcf3c92487ca	841	(pcb->state == CLOSE_WAIT))) {
idinor	0:dcf3c92487ca	842	#if LWIP_TCP_KEEPALIVE
idinor	0:dcf3c92487ca	843	if((u32_t)(tcp_ticks - pcb->tmr) >
idinor	0:dcf3c92487ca	844	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
idinor	0:dcf3c92487ca	845	/ TCP_SLOW_INTERVAL)
idinor	0:dcf3c92487ca	846	#else
idinor	0:dcf3c92487ca	847	if((u32_t)(tcp_ticks - pcb->tmr) >
idinor	0:dcf3c92487ca	848	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
idinor	0:dcf3c92487ca	849	#endif /* LWIP_TCP_KEEPALIVE */
idinor	0:dcf3c92487ca	850	{
idinor	0:dcf3c92487ca	851	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
idinor	0:dcf3c92487ca	852	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
idinor	0:dcf3c92487ca	853	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
idinor	0:dcf3c92487ca	854
idinor	0:dcf3c92487ca	855	++pcb_remove;
idinor	0:dcf3c92487ca	856	++pcb_reset;
idinor	0:dcf3c92487ca	857	}
idinor	0:dcf3c92487ca	858	#if LWIP_TCP_KEEPALIVE
idinor	0:dcf3c92487ca	859	else if((u32_t)(tcp_ticks - pcb->tmr) >
idinor	0:dcf3c92487ca	860	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
idinor	0:dcf3c92487ca	861	/ TCP_SLOW_INTERVAL)
idinor	0:dcf3c92487ca	862	#else
idinor	0:dcf3c92487ca	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
idinor	0:dcf3c92487ca	864	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
idinor	0:dcf3c92487ca	865	/ TCP_SLOW_INTERVAL)
idinor	0:dcf3c92487ca	866	#endif /* LWIP_TCP_KEEPALIVE */
idinor	0:dcf3c92487ca	867	{
idinor	0:dcf3c92487ca	868	tcp_keepalive(pcb);
idinor	0:dcf3c92487ca	869	pcb->keep_cnt_sent++;
idinor	0:dcf3c92487ca	870	}
idinor	0:dcf3c92487ca	871	}
idinor	0:dcf3c92487ca	872
idinor	0:dcf3c92487ca	873	/* If this PCB has queued out of sequence data, but has been
idinor	0:dcf3c92487ca	874	inactive for too long, will drop the data (it will eventually
idinor	0:dcf3c92487ca	875	be retransmitted). */
idinor	0:dcf3c92487ca	876	#if TCP_QUEUE_OOSEQ
idinor	0:dcf3c92487ca	877	if (pcb->ooseq != NULL &&
idinor	0:dcf3c92487ca	878	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
idinor	0:dcf3c92487ca	879	tcp_segs_free(pcb->ooseq);
idinor	0:dcf3c92487ca	880	pcb->ooseq = NULL;
idinor	0:dcf3c92487ca	881	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
idinor	0:dcf3c92487ca	882	}
idinor	0:dcf3c92487ca	883	#endif /* TCP_QUEUE_OOSEQ */
idinor	0:dcf3c92487ca	884
idinor	0:dcf3c92487ca	885	/* Check if this PCB has stayed too long in SYN-RCVD */
idinor	0:dcf3c92487ca	886	if (pcb->state == SYN_RCVD) {
idinor	0:dcf3c92487ca	887	if ((u32_t)(tcp_ticks - pcb->tmr) >
idinor	0:dcf3c92487ca	888	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
idinor	0:dcf3c92487ca	889	++pcb_remove;
idinor	0:dcf3c92487ca	890	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
idinor	0:dcf3c92487ca	891	}
idinor	0:dcf3c92487ca	892	}
idinor	0:dcf3c92487ca	893
idinor	0:dcf3c92487ca	894	/* Check if this PCB has stayed too long in LAST-ACK */
idinor	0:dcf3c92487ca	895	if (pcb->state == LAST_ACK) {
idinor	0:dcf3c92487ca	896	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
idinor	0:dcf3c92487ca	897	++pcb_remove;
idinor	0:dcf3c92487ca	898	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
idinor	0:dcf3c92487ca	899	}
idinor	0:dcf3c92487ca	900	}
idinor	0:dcf3c92487ca	901
idinor	0:dcf3c92487ca	902	/* If the PCB should be removed, do it. */
idinor	0:dcf3c92487ca	903	if (pcb_remove) {
idinor	0:dcf3c92487ca	904	tcp_pcb_purge(pcb);
idinor	0:dcf3c92487ca	905	/* Remove PCB from tcp_active_pcbs list. */
idinor	0:dcf3c92487ca	906	if (prev != NULL) {
idinor	0:dcf3c92487ca	907	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
idinor	0:dcf3c92487ca	908	prev->next = pcb->next;
idinor	0:dcf3c92487ca	909	} else {
idinor	0:dcf3c92487ca	910	/* This PCB was the first. */
idinor	0:dcf3c92487ca	911	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
idinor	0:dcf3c92487ca	912	tcp_active_pcbs = pcb->next;
idinor	0:dcf3c92487ca	913	}
idinor	0:dcf3c92487ca	914
idinor	0:dcf3c92487ca	915	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
idinor	0:dcf3c92487ca	916	if (pcb_reset) {
idinor	0:dcf3c92487ca	917	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
idinor	0:dcf3c92487ca	918	pcb->local_port, pcb->remote_port);
idinor	0:dcf3c92487ca	919	}
idinor	0:dcf3c92487ca	920
idinor	0:dcf3c92487ca	921	pcb2 = pcb->next;
idinor	0:dcf3c92487ca	922	memp_free(MEMP_TCP_PCB, pcb);
idinor	0:dcf3c92487ca	923	pcb = pcb2;
idinor	0:dcf3c92487ca	924	} else {
idinor	0:dcf3c92487ca	925	/* get the 'next' element now and work with 'prev' below (in case of abort) */
idinor	0:dcf3c92487ca	926	prev = pcb;
idinor	0:dcf3c92487ca	927	pcb = pcb->next;
idinor	0:dcf3c92487ca	928
idinor	0:dcf3c92487ca	929	/* We check if we should poll the connection. */
idinor	0:dcf3c92487ca	930	++prev->polltmr;
idinor	0:dcf3c92487ca	931	if (prev->polltmr >= prev->pollinterval) {
idinor	0:dcf3c92487ca	932	prev->polltmr = 0;
idinor	0:dcf3c92487ca	933	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
idinor	0:dcf3c92487ca	934	TCP_EVENT_POLL(prev, err);
idinor	0:dcf3c92487ca	935	/* if err == ERR_ABRT, 'prev' is already deallocated */
idinor	0:dcf3c92487ca	936	if (err == ERR_OK) {
idinor	0:dcf3c92487ca	937	tcp_output(prev);
idinor	0:dcf3c92487ca	938	}
idinor	0:dcf3c92487ca	939	}
idinor	0:dcf3c92487ca	940	}
idinor	0:dcf3c92487ca	941	}
idinor	0:dcf3c92487ca	942
idinor	0:dcf3c92487ca	943
idinor	0:dcf3c92487ca	944	/* Steps through all of the TIME-WAIT PCBs. */
idinor	0:dcf3c92487ca	945	prev = NULL;
idinor	0:dcf3c92487ca	946	pcb = tcp_tw_pcbs;
idinor	0:dcf3c92487ca	947	while (pcb != NULL) {
idinor	0:dcf3c92487ca	948	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
idinor	0:dcf3c92487ca	949	pcb_remove = 0;
idinor	0:dcf3c92487ca	950
idinor	0:dcf3c92487ca	951	/* Check if this PCB has stayed long enough in TIME-WAIT */
idinor	0:dcf3c92487ca	952	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
idinor	0:dcf3c92487ca	953	++pcb_remove;
idinor	0:dcf3c92487ca	954	}
idinor	0:dcf3c92487ca	955
idinor	0:dcf3c92487ca	956
idinor	0:dcf3c92487ca	957
idinor	0:dcf3c92487ca	958	/* If the PCB should be removed, do it. */
idinor	0:dcf3c92487ca	959	if (pcb_remove) {
idinor	0:dcf3c92487ca	960	tcp_pcb_purge(pcb);
idinor	0:dcf3c92487ca	961	/* Remove PCB from tcp_tw_pcbs list. */
idinor	0:dcf3c92487ca	962	if (prev != NULL) {
idinor	0:dcf3c92487ca	963	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
idinor	0:dcf3c92487ca	964	prev->next = pcb->next;
idinor	0:dcf3c92487ca	965	} else {
idinor	0:dcf3c92487ca	966	/* This PCB was the first. */
idinor	0:dcf3c92487ca	967	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
idinor	0:dcf3c92487ca	968	tcp_tw_pcbs = pcb->next;
idinor	0:dcf3c92487ca	969	}
idinor	0:dcf3c92487ca	970	pcb2 = pcb->next;
idinor	0:dcf3c92487ca	971	memp_free(MEMP_TCP_PCB, pcb);
idinor	0:dcf3c92487ca	972	pcb = pcb2;
idinor	0:dcf3c92487ca	973	} else {
idinor	0:dcf3c92487ca	974	prev = pcb;
idinor	0:dcf3c92487ca	975	pcb = pcb->next;
idinor	0:dcf3c92487ca	976	}
idinor	0:dcf3c92487ca	977	}
idinor	0:dcf3c92487ca	978	}
idinor	0:dcf3c92487ca	979
idinor	0:dcf3c92487ca	980	/**
idinor	0:dcf3c92487ca	981	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
idinor	0:dcf3c92487ca	982	* "refused" by upper layer (application) and sends delayed ACKs.
idinor	0:dcf3c92487ca	983	*
idinor	0:dcf3c92487ca	984	* Automatically called from tcp_tmr().
idinor	0:dcf3c92487ca	985	*/
idinor	0:dcf3c92487ca	986	void
idinor	0:dcf3c92487ca	987	tcp_fasttmr(void)
idinor	0:dcf3c92487ca	988	{
idinor	0:dcf3c92487ca	989	struct tcp_pcb *pcb = tcp_active_pcbs;
idinor	0:dcf3c92487ca	990
idinor	0:dcf3c92487ca	991	while(pcb != NULL) {
idinor	0:dcf3c92487ca	992	struct tcp_pcb *next = pcb->next;
idinor	0:dcf3c92487ca	993	/* If there is data which was previously "refused" by upper layer */
idinor	0:dcf3c92487ca	994	if (pcb->refused_data != NULL) {
idinor	0:dcf3c92487ca	995	/* Notify again application with data previously received. */
idinor	0:dcf3c92487ca	996	err_t err;
idinor	0:dcf3c92487ca	997	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
idinor	0:dcf3c92487ca	998	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
idinor	0:dcf3c92487ca	999	if (err == ERR_OK) {
idinor	0:dcf3c92487ca	1000	pcb->refused_data = NULL;
idinor	0:dcf3c92487ca	1001	} else if (err == ERR_ABRT) {
idinor	0:dcf3c92487ca	1002	/* if err == ERR_ABRT, 'pcb' is already deallocated */
idinor	0:dcf3c92487ca	1003	pcb = NULL;
idinor	0:dcf3c92487ca	1004	}
idinor	0:dcf3c92487ca	1005	}
idinor	0:dcf3c92487ca	1006
idinor	0:dcf3c92487ca	1007	/* send delayed ACKs */
idinor	0:dcf3c92487ca	1008	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
idinor	0:dcf3c92487ca	1009	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
idinor	0:dcf3c92487ca	1010	tcp_ack_now(pcb);
idinor	0:dcf3c92487ca	1011	tcp_output(pcb);
idinor	0:dcf3c92487ca	1012	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
idinor	0:dcf3c92487ca	1013	}
idinor	0:dcf3c92487ca	1014
idinor	0:dcf3c92487ca	1015	pcb = next;
idinor	0:dcf3c92487ca	1016	}
idinor	0:dcf3c92487ca	1017	}
idinor	0:dcf3c92487ca	1018
idinor	0:dcf3c92487ca	1019	/**
idinor	0:dcf3c92487ca	1020	* Deallocates a list of TCP segments (tcp_seg structures).
idinor	0:dcf3c92487ca	1021	*
idinor	0:dcf3c92487ca	1022	* @param seg tcp_seg list of TCP segments to free
idinor	0:dcf3c92487ca	1023	*/
idinor	0:dcf3c92487ca	1024	void
idinor	0:dcf3c92487ca	1025	tcp_segs_free(struct tcp_seg *seg)
idinor	0:dcf3c92487ca	1026	{
idinor	0:dcf3c92487ca	1027	while (seg != NULL) {
idinor	0:dcf3c92487ca	1028	struct tcp_seg *next = seg->next;
idinor	0:dcf3c92487ca	1029	tcp_seg_free(seg);
idinor	0:dcf3c92487ca	1030	seg = next;
idinor	0:dcf3c92487ca	1031	}
idinor	0:dcf3c92487ca	1032	}
idinor	0:dcf3c92487ca	1033
idinor	0:dcf3c92487ca	1034	/**
idinor	0:dcf3c92487ca	1035	* Frees a TCP segment (tcp_seg structure).
idinor	0:dcf3c92487ca	1036	*
idinor	0:dcf3c92487ca	1037	* @param seg single tcp_seg to free
idinor	0:dcf3c92487ca	1038	*/
idinor	0:dcf3c92487ca	1039	void
idinor	0:dcf3c92487ca	1040	tcp_seg_free(struct tcp_seg *seg)
idinor	0:dcf3c92487ca	1041	{
idinor	0:dcf3c92487ca	1042	if (seg != NULL) {
idinor	0:dcf3c92487ca	1043	if (seg->p != NULL) {
idinor	0:dcf3c92487ca	1044	pbuf_free(seg->p);
idinor	0:dcf3c92487ca	1045	#if TCP_DEBUG
idinor	0:dcf3c92487ca	1046	seg->p = NULL;
idinor	0:dcf3c92487ca	1047	#endif /* TCP_DEBUG */
idinor	0:dcf3c92487ca	1048	}
idinor	0:dcf3c92487ca	1049	memp_free(MEMP_TCP_SEG, seg);
idinor	0:dcf3c92487ca	1050	}
idinor	0:dcf3c92487ca	1051	}
idinor	0:dcf3c92487ca	1052
idinor	0:dcf3c92487ca	1053	/**
idinor	0:dcf3c92487ca	1054	* Sets the priority of a connection.
idinor	0:dcf3c92487ca	1055	*
idinor	0:dcf3c92487ca	1056	* @param pcb the tcp_pcb to manipulate
idinor	0:dcf3c92487ca	1057	* @param prio new priority
idinor	0:dcf3c92487ca	1058	*/
idinor	0:dcf3c92487ca	1059	void
idinor	0:dcf3c92487ca	1060	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
idinor	0:dcf3c92487ca	1061	{
idinor	0:dcf3c92487ca	1062	pcb->prio = prio;
idinor	0:dcf3c92487ca	1063	}
idinor	0:dcf3c92487ca	1064
idinor	0:dcf3c92487ca	1065	#if TCP_QUEUE_OOSEQ
idinor	0:dcf3c92487ca	1066	/**
idinor	0:dcf3c92487ca	1067	* Returns a copy of the given TCP segment.
idinor	0:dcf3c92487ca	1068	* The pbuf and data are not copied, only the pointers
idinor	0:dcf3c92487ca	1069	*
idinor	0:dcf3c92487ca	1070	* @param seg the old tcp_seg
idinor	0:dcf3c92487ca	1071	* @return a copy of seg
idinor	0:dcf3c92487ca	1072	*/
idinor	0:dcf3c92487ca	1073	struct tcp_seg *
idinor	0:dcf3c92487ca	1074	tcp_seg_copy(struct tcp_seg *seg)
idinor	0:dcf3c92487ca	1075	{
idinor	0:dcf3c92487ca	1076	struct tcp_seg *cseg;
idinor	0:dcf3c92487ca	1077
idinor	0:dcf3c92487ca	1078	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
idinor	0:dcf3c92487ca	1079	if (cseg == NULL) {
idinor	0:dcf3c92487ca	1080	return NULL;
idinor	0:dcf3c92487ca	1081	}
idinor	0:dcf3c92487ca	1082	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
idinor	0:dcf3c92487ca	1083	pbuf_ref(cseg->p);
idinor	0:dcf3c92487ca	1084	return cseg;
idinor	0:dcf3c92487ca	1085	}
idinor	0:dcf3c92487ca	1086	#endif /* TCP_QUEUE_OOSEQ */
idinor	0:dcf3c92487ca	1087
idinor	0:dcf3c92487ca	1088	#if LWIP_CALLBACK_API
idinor	0:dcf3c92487ca	1089	/**
idinor	0:dcf3c92487ca	1090	* Default receive callback that is called if the user didn't register
idinor	0:dcf3c92487ca	1091	* a recv callback for the pcb.
idinor	0:dcf3c92487ca	1092	*/
idinor	0:dcf3c92487ca	1093	err_t
idinor	0:dcf3c92487ca	1094	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
idinor	0:dcf3c92487ca	1095	{
idinor	0:dcf3c92487ca	1096	LWIP_UNUSED_ARG(arg);
idinor	0:dcf3c92487ca	1097	if (p != NULL) {
idinor	0:dcf3c92487ca	1098	tcp_recved(pcb, p->tot_len);
idinor	0:dcf3c92487ca	1099	pbuf_free(p);
idinor	0:dcf3c92487ca	1100	} else if (err == ERR_OK) {
idinor	0:dcf3c92487ca	1101	return tcp_close(pcb);
idinor	0:dcf3c92487ca	1102	}
idinor	0:dcf3c92487ca	1103	return ERR_OK;
idinor	0:dcf3c92487ca	1104	}
idinor	0:dcf3c92487ca	1105	#endif /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	1106
idinor	0:dcf3c92487ca	1107	/**
idinor	0:dcf3c92487ca	1108	* Kills the oldest active connection that has lower priority than prio.
idinor	0:dcf3c92487ca	1109	*
idinor	0:dcf3c92487ca	1110	* @param prio minimum priority
idinor	0:dcf3c92487ca	1111	*/
idinor	0:dcf3c92487ca	1112	static void
idinor	0:dcf3c92487ca	1113	tcp_kill_prio(u8_t prio)
idinor	0:dcf3c92487ca	1114	{
idinor	0:dcf3c92487ca	1115	struct tcp_pcb pcb, inactive;
idinor	0:dcf3c92487ca	1116	u32_t inactivity;
idinor	0:dcf3c92487ca	1117	u8_t mprio;
idinor	0:dcf3c92487ca	1118
idinor	0:dcf3c92487ca	1119
idinor	0:dcf3c92487ca	1120	mprio = TCP_PRIO_MAX;
idinor	0:dcf3c92487ca	1121
idinor	0:dcf3c92487ca	1122	/* We kill the oldest active connection that has lower priority than prio. */
idinor	0:dcf3c92487ca	1123	inactivity = 0;
idinor	0:dcf3c92487ca	1124	inactive = NULL;
idinor	0:dcf3c92487ca	1125	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
idinor	0:dcf3c92487ca	1126	if (pcb->prio <= prio &&
idinor	0:dcf3c92487ca	1127	pcb->prio <= mprio &&
idinor	0:dcf3c92487ca	1128	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
idinor	0:dcf3c92487ca	1129	inactivity = tcp_ticks - pcb->tmr;
idinor	0:dcf3c92487ca	1130	inactive = pcb;
idinor	0:dcf3c92487ca	1131	mprio = pcb->prio;
idinor	0:dcf3c92487ca	1132	}
idinor	0:dcf3c92487ca	1133	}
idinor	0:dcf3c92487ca	1134	if (inactive != NULL) {
idinor	0:dcf3c92487ca	1135	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
idinor	0:dcf3c92487ca	1136	(void *)inactive, inactivity));
idinor	0:dcf3c92487ca	1137	tcp_abort(inactive);
idinor	0:dcf3c92487ca	1138	}
idinor	0:dcf3c92487ca	1139	}
idinor	0:dcf3c92487ca	1140
idinor	0:dcf3c92487ca	1141	/**
idinor	0:dcf3c92487ca	1142	* Kills the oldest connection that is in TIME_WAIT state.
idinor	0:dcf3c92487ca	1143	* Called from tcp_alloc() if no more connections are available.
idinor	0:dcf3c92487ca	1144	*/
idinor	0:dcf3c92487ca	1145	static void
idinor	0:dcf3c92487ca	1146	tcp_kill_timewait(void)
idinor	0:dcf3c92487ca	1147	{
idinor	0:dcf3c92487ca	1148	struct tcp_pcb pcb, inactive;
idinor	0:dcf3c92487ca	1149	u32_t inactivity;
idinor	0:dcf3c92487ca	1150
idinor	0:dcf3c92487ca	1151	inactivity = 0;
idinor	0:dcf3c92487ca	1152	inactive = NULL;
idinor	0:dcf3c92487ca	1153	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
idinor	0:dcf3c92487ca	1154	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
idinor	0:dcf3c92487ca	1155	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
idinor	0:dcf3c92487ca	1156	inactivity = tcp_ticks - pcb->tmr;
idinor	0:dcf3c92487ca	1157	inactive = pcb;
idinor	0:dcf3c92487ca	1158	}
idinor	0:dcf3c92487ca	1159	}
idinor	0:dcf3c92487ca	1160	if (inactive != NULL) {
idinor	0:dcf3c92487ca	1161	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
idinor	0:dcf3c92487ca	1162	(void *)inactive, inactivity));
idinor	0:dcf3c92487ca	1163	tcp_abort(inactive);
idinor	0:dcf3c92487ca	1164	}
idinor	0:dcf3c92487ca	1165	}
idinor	0:dcf3c92487ca	1166
idinor	0:dcf3c92487ca	1167	/**
idinor	0:dcf3c92487ca	1168	* Allocate a new tcp_pcb structure.
idinor	0:dcf3c92487ca	1169	*
idinor	0:dcf3c92487ca	1170	* @param prio priority for the new pcb
idinor	0:dcf3c92487ca	1171	* @return a new tcp_pcb that initially is in state CLOSED
idinor	0:dcf3c92487ca	1172	*/
idinor	0:dcf3c92487ca	1173	struct tcp_pcb *
idinor	0:dcf3c92487ca	1174	tcp_alloc(u8_t prio)
idinor	0:dcf3c92487ca	1175	{
idinor	0:dcf3c92487ca	1176	struct tcp_pcb *pcb;
idinor	0:dcf3c92487ca	1177	u32_t iss;
idinor	0:dcf3c92487ca	1178
idinor	0:dcf3c92487ca	1179	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
idinor	0:dcf3c92487ca	1180	if (pcb == NULL) {
idinor	0:dcf3c92487ca	1181	/* Try killing oldest connection in TIME-WAIT. */
idinor	0:dcf3c92487ca	1182	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
idinor	0:dcf3c92487ca	1183	tcp_kill_timewait();
idinor	0:dcf3c92487ca	1184	/* Try to allocate a tcp_pcb again. */
idinor	0:dcf3c92487ca	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
idinor	0:dcf3c92487ca	1186	if (pcb == NULL) {
idinor	0:dcf3c92487ca	1187	/* Try killing active connections with lower priority than the new one. */
idinor	0:dcf3c92487ca	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
idinor	0:dcf3c92487ca	1189	tcp_kill_prio(prio);
idinor	0:dcf3c92487ca	1190	/* Try to allocate a tcp_pcb again. */
idinor	0:dcf3c92487ca	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
idinor	0:dcf3c92487ca	1192	if (pcb != NULL) {
idinor	0:dcf3c92487ca	1193	/* adjust err stats: memp_malloc failed twice before */
idinor	0:dcf3c92487ca	1194	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
idinor	0:dcf3c92487ca	1195	}
idinor	0:dcf3c92487ca	1196	}
idinor	0:dcf3c92487ca	1197	if (pcb != NULL) {
idinor	0:dcf3c92487ca	1198	/* adjust err stats: timewait PCB was freed above */
idinor	0:dcf3c92487ca	1199	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
idinor	0:dcf3c92487ca	1200	}
idinor	0:dcf3c92487ca	1201	}
idinor	0:dcf3c92487ca	1202	if (pcb != NULL) {
idinor	0:dcf3c92487ca	1203	memset(pcb, 0, sizeof(struct tcp_pcb));
idinor	0:dcf3c92487ca	1204	pcb->prio = prio;
idinor	0:dcf3c92487ca	1205	pcb->snd_buf = TCP_SND_BUF;
idinor	0:dcf3c92487ca	1206	pcb->snd_queuelen = 0;
idinor	0:dcf3c92487ca	1207	pcb->rcv_wnd = TCP_WND;
idinor	0:dcf3c92487ca	1208	pcb->rcv_ann_wnd = TCP_WND;
idinor	0:dcf3c92487ca	1209	pcb->tos = 0;
idinor	0:dcf3c92487ca	1210	pcb->ttl = TCP_TTL;
idinor	0:dcf3c92487ca	1211	/* As initial send MSS, we use TCP_MSS but limit it to 536.
idinor	0:dcf3c92487ca	1212	The send MSS is updated when an MSS option is received. */
idinor	0:dcf3c92487ca	1213	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
idinor	0:dcf3c92487ca	1214	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
idinor	0:dcf3c92487ca	1215	pcb->sa = 0;
idinor	0:dcf3c92487ca	1216	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
idinor	0:dcf3c92487ca	1217	pcb->rtime = -1;
idinor	0:dcf3c92487ca	1218	pcb->cwnd = 1;
idinor	0:dcf3c92487ca	1219	iss = tcp_next_iss();
idinor	0:dcf3c92487ca	1220	pcb->snd_wl2 = iss;
idinor	0:dcf3c92487ca	1221	pcb->snd_nxt = iss;
idinor	0:dcf3c92487ca	1222	pcb->lastack = iss;
idinor	0:dcf3c92487ca	1223	pcb->snd_lbb = iss;
idinor	0:dcf3c92487ca	1224	pcb->tmr = tcp_ticks;
idinor	0:dcf3c92487ca	1225
idinor	0:dcf3c92487ca	1226	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
idinor	0:dcf3c92487ca	1227
idinor	0:dcf3c92487ca	1228	pcb->polltmr = 0;
idinor	0:dcf3c92487ca	1229
idinor	0:dcf3c92487ca	1230	#if LWIP_CALLBACK_API
idinor	0:dcf3c92487ca	1231	pcb->recv = tcp_recv_null;
idinor	0:dcf3c92487ca	1232	#endif /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	1233
idinor	0:dcf3c92487ca	1234	/* Init KEEPALIVE timer */
idinor	0:dcf3c92487ca	1235	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
idinor	0:dcf3c92487ca	1236
idinor	0:dcf3c92487ca	1237	#if LWIP_TCP_KEEPALIVE
idinor	0:dcf3c92487ca	1238	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
idinor	0:dcf3c92487ca	1239	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
idinor	0:dcf3c92487ca	1240	#endif /* LWIP_TCP_KEEPALIVE */
idinor	0:dcf3c92487ca	1241
idinor	0:dcf3c92487ca	1242	pcb->keep_cnt_sent = 0;
idinor	0:dcf3c92487ca	1243	}
idinor	0:dcf3c92487ca	1244	return pcb;
idinor	0:dcf3c92487ca	1245	}
idinor	0:dcf3c92487ca	1246
idinor	0:dcf3c92487ca	1247	/**
idinor	0:dcf3c92487ca	1248	* Creates a new TCP protocol control block but doesn't place it on
idinor	0:dcf3c92487ca	1249	* any of the TCP PCB lists.
idinor	0:dcf3c92487ca	1250	* The pcb is not put on any list until binding using tcp_bind().
idinor	0:dcf3c92487ca	1251	*
idinor	0:dcf3c92487ca	1252	* @internal: Maybe there should be a idle TCP PCB list where these
idinor	0:dcf3c92487ca	1253	* PCBs are put on. Port reservation using tcp_bind() is implemented but
idinor	0:dcf3c92487ca	1254	* allocated pcbs that are not bound can't be killed automatically if wanting
idinor	0:dcf3c92487ca	1255	* to allocate a pcb with higher prio (@see tcp_kill_prio())
idinor	0:dcf3c92487ca	1256	*
idinor	0:dcf3c92487ca	1257	* @return a new tcp_pcb that initially is in state CLOSED
idinor	0:dcf3c92487ca	1258	*/
idinor	0:dcf3c92487ca	1259	struct tcp_pcb *
idinor	0:dcf3c92487ca	1260	tcp_new(void)
idinor	0:dcf3c92487ca	1261	{
idinor	0:dcf3c92487ca	1262	return tcp_alloc(TCP_PRIO_NORMAL);
idinor	0:dcf3c92487ca	1263	}
idinor	0:dcf3c92487ca	1264
idinor	0:dcf3c92487ca	1265	/**
idinor	0:dcf3c92487ca	1266	* Used to specify the argument that should be passed callback
idinor	0:dcf3c92487ca	1267	* functions.
idinor	0:dcf3c92487ca	1268	*
idinor	0:dcf3c92487ca	1269	* @param pcb tcp_pcb to set the callback argument
idinor	0:dcf3c92487ca	1270	* @param arg void pointer argument to pass to callback functions
idinor	0:dcf3c92487ca	1271	*/
idinor	0:dcf3c92487ca	1272	void
idinor	0:dcf3c92487ca	1273	tcp_arg(struct tcp_pcb pcb, void arg)
idinor	0:dcf3c92487ca	1274	{
idinor	0:dcf3c92487ca	1275	pcb->callback_arg = arg;
idinor	0:dcf3c92487ca	1276	}
idinor	0:dcf3c92487ca	1277	#if LWIP_CALLBACK_API
idinor	0:dcf3c92487ca	1278
idinor	0:dcf3c92487ca	1279	/**
idinor	0:dcf3c92487ca	1280	* Used to specify the function that should be called when a TCP
idinor	0:dcf3c92487ca	1281	* connection receives data.
idinor	0:dcf3c92487ca	1282	*
idinor	0:dcf3c92487ca	1283	* @param pcb tcp_pcb to set the recv callback
idinor	0:dcf3c92487ca	1284	* @param recv callback function to call for this pcb when data is received
idinor	0:dcf3c92487ca	1285	*/
idinor	0:dcf3c92487ca	1286	void
idinor	0:dcf3c92487ca	1287	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
idinor	0:dcf3c92487ca	1288	{
idinor	0:dcf3c92487ca	1289	pcb->recv = recv;
idinor	0:dcf3c92487ca	1290	}
idinor	0:dcf3c92487ca	1291
idinor	0:dcf3c92487ca	1292	/**
idinor	0:dcf3c92487ca	1293	* Used to specify the function that should be called when TCP data
idinor	0:dcf3c92487ca	1294	* has been successfully delivered to the remote host.
idinor	0:dcf3c92487ca	1295	*
idinor	0:dcf3c92487ca	1296	* @param pcb tcp_pcb to set the sent callback
idinor	0:dcf3c92487ca	1297	* @param sent callback function to call for this pcb when data is successfully sent
idinor	0:dcf3c92487ca	1298	*/
idinor	0:dcf3c92487ca	1299	void
idinor	0:dcf3c92487ca	1300	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
idinor	0:dcf3c92487ca	1301	{
idinor	0:dcf3c92487ca	1302	pcb->sent = sent;
idinor	0:dcf3c92487ca	1303	}
idinor	0:dcf3c92487ca	1304
idinor	0:dcf3c92487ca	1305	/**
idinor	0:dcf3c92487ca	1306	* Used to specify the function that should be called when a fatal error
idinor	0:dcf3c92487ca	1307	* has occured on the connection.
idinor	0:dcf3c92487ca	1308	*
idinor	0:dcf3c92487ca	1309	* @param pcb tcp_pcb to set the err callback
idinor	0:dcf3c92487ca	1310	* @param err callback function to call for this pcb when a fatal error
idinor	0:dcf3c92487ca	1311	* has occured on the connection
idinor	0:dcf3c92487ca	1312	*/
idinor	0:dcf3c92487ca	1313	void
idinor	0:dcf3c92487ca	1314	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
idinor	0:dcf3c92487ca	1315	{
idinor	0:dcf3c92487ca	1316	pcb->errf = err;
idinor	0:dcf3c92487ca	1317	}
idinor	0:dcf3c92487ca	1318
idinor	0:dcf3c92487ca	1319	/**
idinor	0:dcf3c92487ca	1320	* Used for specifying the function that should be called when a
idinor	0:dcf3c92487ca	1321	* LISTENing connection has been connected to another host.
idinor	0:dcf3c92487ca	1322	*
idinor	0:dcf3c92487ca	1323	* @param pcb tcp_pcb to set the accept callback
idinor	0:dcf3c92487ca	1324	* @param accept callback function to call for this pcb when LISTENing
idinor	0:dcf3c92487ca	1325	* connection has been connected to another host
idinor	0:dcf3c92487ca	1326	*/
idinor	0:dcf3c92487ca	1327	void
idinor	0:dcf3c92487ca	1328	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
idinor	0:dcf3c92487ca	1329	{
idinor	0:dcf3c92487ca	1330	pcb->accept = accept;
idinor	0:dcf3c92487ca	1331	}
idinor	0:dcf3c92487ca	1332	#endif /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	1333
idinor	0:dcf3c92487ca	1334
idinor	0:dcf3c92487ca	1335	/**
idinor	0:dcf3c92487ca	1336	* Used to specify the function that should be called periodically
idinor	0:dcf3c92487ca	1337	* from TCP. The interval is specified in terms of the TCP coarse
idinor	0:dcf3c92487ca	1338	* timer interval, which is called twice a second.
idinor	0:dcf3c92487ca	1339	*
idinor	0:dcf3c92487ca	1340	*/
idinor	0:dcf3c92487ca	1341	void
idinor	0:dcf3c92487ca	1342	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
idinor	0:dcf3c92487ca	1343	{
idinor	0:dcf3c92487ca	1344	#if LWIP_CALLBACK_API
idinor	0:dcf3c92487ca	1345	pcb->poll = poll;
idinor	0:dcf3c92487ca	1346	#else /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	1347	LWIP_UNUSED_ARG(poll);
idinor	0:dcf3c92487ca	1348	#endif /* LWIP_CALLBACK_API */
idinor	0:dcf3c92487ca	1349	pcb->pollinterval = interval;
idinor	0:dcf3c92487ca	1350	}
idinor	0:dcf3c92487ca	1351
idinor	0:dcf3c92487ca	1352	/**
idinor	0:dcf3c92487ca	1353	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
idinor	0:dcf3c92487ca	1354	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
idinor	0:dcf3c92487ca	1355	*
idinor	0:dcf3c92487ca	1356	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
idinor	0:dcf3c92487ca	1357	*/
idinor	0:dcf3c92487ca	1358	void
idinor	0:dcf3c92487ca	1359	tcp_pcb_purge(struct tcp_pcb *pcb)
idinor	0:dcf3c92487ca	1360	{
idinor	0:dcf3c92487ca	1361	if (pcb->state != CLOSED &&
idinor	0:dcf3c92487ca	1362	pcb->state != TIME_WAIT &&
idinor	0:dcf3c92487ca	1363	pcb->state != LISTEN) {
idinor	0:dcf3c92487ca	1364
idinor	0:dcf3c92487ca	1365	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
idinor	0:dcf3c92487ca	1366
idinor	0:dcf3c92487ca	1367	#if TCP_LISTEN_BACKLOG
idinor	0:dcf3c92487ca	1368	if (pcb->state == SYN_RCVD) {
idinor	0:dcf3c92487ca	1369	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
idinor	0:dcf3c92487ca	1370	struct tcp_pcb_listen *lpcb;
idinor	0:dcf3c92487ca	1371	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
idinor	0:dcf3c92487ca	1372	tcp_listen_pcbs.listen_pcbs != NULL);
idinor	0:dcf3c92487ca	1373	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
idinor	0:dcf3c92487ca	1374	if ((lpcb->local_port == pcb->local_port) &&
idinor	0:dcf3c92487ca	1375	(ip_addr_isany(&lpcb->local_ip) \|\|
idinor	0:dcf3c92487ca	1376	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
idinor	0:dcf3c92487ca	1377	/* port and address of the listen pcb match the timed-out pcb */
idinor	0:dcf3c92487ca	1378	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
idinor	0:dcf3c92487ca	1379	lpcb->accepts_pending > 0);
idinor	0:dcf3c92487ca	1380	lpcb->accepts_pending--;
idinor	0:dcf3c92487ca	1381	break;
idinor	0:dcf3c92487ca	1382	}
idinor	0:dcf3c92487ca	1383	}
idinor	0:dcf3c92487ca	1384	}
idinor	0:dcf3c92487ca	1385	#endif /* TCP_LISTEN_BACKLOG */
idinor	0:dcf3c92487ca	1386
idinor	0:dcf3c92487ca	1387
idinor	0:dcf3c92487ca	1388	if (pcb->refused_data != NULL) {
idinor	0:dcf3c92487ca	1389	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
idinor	0:dcf3c92487ca	1390	pbuf_free(pcb->refused_data);
idinor	0:dcf3c92487ca	1391	pcb->refused_data = NULL;
idinor	0:dcf3c92487ca	1392	}
idinor	0:dcf3c92487ca	1393	if (pcb->unsent != NULL) {
idinor	0:dcf3c92487ca	1394	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
idinor	0:dcf3c92487ca	1395	}
idinor	0:dcf3c92487ca	1396	if (pcb->unacked != NULL) {
idinor	0:dcf3c92487ca	1397	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
idinor	0:dcf3c92487ca	1398	}
idinor	0:dcf3c92487ca	1399	#if TCP_QUEUE_OOSEQ
idinor	0:dcf3c92487ca	1400	if (pcb->ooseq != NULL) {
idinor	0:dcf3c92487ca	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
idinor	0:dcf3c92487ca	1402	}
idinor	0:dcf3c92487ca	1403	tcp_segs_free(pcb->ooseq);
idinor	0:dcf3c92487ca	1404	pcb->ooseq = NULL;
idinor	0:dcf3c92487ca	1405	#endif /* TCP_QUEUE_OOSEQ */
idinor	0:dcf3c92487ca	1406
idinor	0:dcf3c92487ca	1407	/* Stop the retransmission timer as it will expect data on unacked
idinor	0:dcf3c92487ca	1408	queue if it fires */
idinor	0:dcf3c92487ca	1409	pcb->rtime = -1;
idinor	0:dcf3c92487ca	1410
idinor	0:dcf3c92487ca	1411	tcp_segs_free(pcb->unsent);
idinor	0:dcf3c92487ca	1412	tcp_segs_free(pcb->unacked);
idinor	0:dcf3c92487ca	1413	pcb->unacked = pcb->unsent = NULL;
idinor	0:dcf3c92487ca	1414	#if TCP_OVERSIZE
idinor	0:dcf3c92487ca	1415	pcb->unsent_oversize = 0;
idinor	0:dcf3c92487ca	1416	#endif /* TCP_OVERSIZE */
idinor	0:dcf3c92487ca	1417	}
idinor	0:dcf3c92487ca	1418	}
idinor	0:dcf3c92487ca	1419
idinor	0:dcf3c92487ca	1420	/**
idinor	0:dcf3c92487ca	1421	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
idinor	0:dcf3c92487ca	1422	*
idinor	0:dcf3c92487ca	1423	* @param pcblist PCB list to purge.
idinor	0:dcf3c92487ca	1424	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
idinor	0:dcf3c92487ca	1425	*/
idinor	0:dcf3c92487ca	1426	void
idinor	0:dcf3c92487ca	1427	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
idinor	0:dcf3c92487ca	1428	{
idinor	0:dcf3c92487ca	1429	TCP_RMV(pcblist, pcb);
idinor	0:dcf3c92487ca	1430
idinor	0:dcf3c92487ca	1431	tcp_pcb_purge(pcb);
idinor	0:dcf3c92487ca	1432
idinor	0:dcf3c92487ca	1433	/* if there is an outstanding delayed ACKs, send it */
idinor	0:dcf3c92487ca	1434	if (pcb->state != TIME_WAIT &&
idinor	0:dcf3c92487ca	1435	pcb->state != LISTEN &&
idinor	0:dcf3c92487ca	1436	pcb->flags & TF_ACK_DELAY) {
idinor	0:dcf3c92487ca	1437	pcb->flags \|= TF_ACK_NOW;
idinor	0:dcf3c92487ca	1438	tcp_output(pcb);
idinor	0:dcf3c92487ca	1439	}
idinor	0:dcf3c92487ca	1440
idinor	0:dcf3c92487ca	1441	if (pcb->state != LISTEN) {
idinor	0:dcf3c92487ca	1442	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
idinor	0:dcf3c92487ca	1443	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
idinor	0:dcf3c92487ca	1444	#if TCP_QUEUE_OOSEQ
idinor	0:dcf3c92487ca	1445	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
idinor	0:dcf3c92487ca	1446	#endif /* TCP_QUEUE_OOSEQ */
idinor	0:dcf3c92487ca	1447	}
idinor	0:dcf3c92487ca	1448
idinor	0:dcf3c92487ca	1449	pcb->state = CLOSED;
idinor	0:dcf3c92487ca	1450
idinor	0:dcf3c92487ca	1451	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
idinor	0:dcf3c92487ca	1452	}
idinor	0:dcf3c92487ca	1453
idinor	0:dcf3c92487ca	1454	/**
idinor	0:dcf3c92487ca	1455	* Calculates a new initial sequence number for new connections.
idinor	0:dcf3c92487ca	1456	*
idinor	0:dcf3c92487ca	1457	* @return u32_t pseudo random sequence number
idinor	0:dcf3c92487ca	1458	*/
idinor	0:dcf3c92487ca	1459	u32_t
idinor	0:dcf3c92487ca	1460	tcp_next_iss(void)
idinor	0:dcf3c92487ca	1461	{
idinor	0:dcf3c92487ca	1462	static u32_t iss = 6510;
idinor	0:dcf3c92487ca	1463
idinor	0:dcf3c92487ca	1464	iss += tcp_ticks; /* XXX */
idinor	0:dcf3c92487ca	1465	return iss;
idinor	0:dcf3c92487ca	1466	}
idinor	0:dcf3c92487ca	1467
idinor	0:dcf3c92487ca	1468	#if TCP_CALCULATE_EFF_SEND_MSS
idinor	0:dcf3c92487ca	1469	/**
idinor	0:dcf3c92487ca	1470	* Calcluates the effective send mss that can be used for a specific IP address
idinor	0:dcf3c92487ca	1471	* by using ip_route to determin the netif used to send to the address and
idinor	0:dcf3c92487ca	1472	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
idinor	0:dcf3c92487ca	1473	*/
idinor	0:dcf3c92487ca	1474	u16_t
idinor	0:dcf3c92487ca	1475	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
idinor	0:dcf3c92487ca	1476	{
idinor	0:dcf3c92487ca	1477	u16_t mss_s;
idinor	0:dcf3c92487ca	1478	struct netif *outif;
idinor	0:dcf3c92487ca	1479
idinor	0:dcf3c92487ca	1480	outif = ip_route(addr);
idinor	0:dcf3c92487ca	1481	if ((outif != NULL) && (outif->mtu != 0)) {
idinor	0:dcf3c92487ca	1482	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
idinor	0:dcf3c92487ca	1483	/* RFC 1122, chap 4.2.2.6:
idinor	0:dcf3c92487ca	1484	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
idinor	0:dcf3c92487ca	1485	* We correct for TCP options in tcp_write(), and don't support IP options.
idinor	0:dcf3c92487ca	1486	*/
idinor	0:dcf3c92487ca	1487	sendmss = LWIP_MIN(sendmss, mss_s);
idinor	0:dcf3c92487ca	1488	}
idinor	0:dcf3c92487ca	1489	return sendmss;
idinor	0:dcf3c92487ca	1490	}
idinor	0:dcf3c92487ca	1491	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
idinor	0:dcf3c92487ca	1492
idinor	0:dcf3c92487ca	1493	const char*
idinor	0:dcf3c92487ca	1494	tcp_debug_state_str(enum tcp_state s)
idinor	0:dcf3c92487ca	1495	{
idinor	0:dcf3c92487ca	1496	return tcp_state_str[s];
idinor	0:dcf3c92487ca	1497	}
idinor	0:dcf3c92487ca	1498
idinor	0:dcf3c92487ca	1499	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
idinor	0:dcf3c92487ca	1500	/**
idinor	0:dcf3c92487ca	1501	* Print a tcp header for debugging purposes.
idinor	0:dcf3c92487ca	1502	*
idinor	0:dcf3c92487ca	1503	* @param tcphdr pointer to a struct tcp_hdr
idinor	0:dcf3c92487ca	1504	*/
idinor	0:dcf3c92487ca	1505	void
idinor	0:dcf3c92487ca	1506	tcp_debug_print(struct tcp_hdr *tcphdr)
idinor	0:dcf3c92487ca	1507	{
idinor	0:dcf3c92487ca	1508	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
idinor	0:dcf3c92487ca	1509	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	1510	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
idinor	0:dcf3c92487ca	1511	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
idinor	0:dcf3c92487ca	1512	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	1513	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
idinor	0:dcf3c92487ca	1514	ntohl(tcphdr->seqno)));
idinor	0:dcf3c92487ca	1515	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	1516	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
idinor	0:dcf3c92487ca	1517	ntohl(tcphdr->ackno)));
idinor	0:dcf3c92487ca	1518	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	1519	LWIP_DEBUGF(TCP_DEBUG, ("\| %2"U16_F" \| \|%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"\| %5"U16_F" \| (hdrlen, flags (",
idinor	0:dcf3c92487ca	1520	TCPH_HDRLEN(tcphdr),
idinor	0:dcf3c92487ca	1521	TCPH_FLAGS(tcphdr) >> 5 & 1,
idinor	0:dcf3c92487ca	1522	TCPH_FLAGS(tcphdr) >> 4 & 1,
idinor	0:dcf3c92487ca	1523	TCPH_FLAGS(tcphdr) >> 3 & 1,
idinor	0:dcf3c92487ca	1524	TCPH_FLAGS(tcphdr) >> 2 & 1,
idinor	0:dcf3c92487ca	1525	TCPH_FLAGS(tcphdr) >> 1 & 1,
idinor	0:dcf3c92487ca	1526	TCPH_FLAGS(tcphdr) & 1,
idinor	0:dcf3c92487ca	1527	ntohs(tcphdr->wnd)));
idinor	0:dcf3c92487ca	1528	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
idinor	0:dcf3c92487ca	1529	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
idinor	0:dcf3c92487ca	1530	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	1531	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
idinor	0:dcf3c92487ca	1532	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
idinor	0:dcf3c92487ca	1533	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	1534	}
idinor	0:dcf3c92487ca	1535
idinor	0:dcf3c92487ca	1536	/**
idinor	0:dcf3c92487ca	1537	* Print a tcp state for debugging purposes.
idinor	0:dcf3c92487ca	1538	*
idinor	0:dcf3c92487ca	1539	* @param s enum tcp_state to print
idinor	0:dcf3c92487ca	1540	*/
idinor	0:dcf3c92487ca	1541	void
idinor	0:dcf3c92487ca	1542	tcp_debug_print_state(enum tcp_state s)
idinor	0:dcf3c92487ca	1543	{
idinor	0:dcf3c92487ca	1544	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
idinor	0:dcf3c92487ca	1545	}
idinor	0:dcf3c92487ca	1546
idinor	0:dcf3c92487ca	1547	/**
idinor	0:dcf3c92487ca	1548	* Print tcp flags for debugging purposes.
idinor	0:dcf3c92487ca	1549	*
idinor	0:dcf3c92487ca	1550	* @param flags tcp flags, all active flags are printed
idinor	0:dcf3c92487ca	1551	*/
idinor	0:dcf3c92487ca	1552	void
idinor	0:dcf3c92487ca	1553	tcp_debug_print_flags(u8_t flags)
idinor	0:dcf3c92487ca	1554	{
idinor	0:dcf3c92487ca	1555	if (flags & TCP_FIN) {
idinor	0:dcf3c92487ca	1556	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
idinor	0:dcf3c92487ca	1557	}
idinor	0:dcf3c92487ca	1558	if (flags & TCP_SYN) {
idinor	0:dcf3c92487ca	1559	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
idinor	0:dcf3c92487ca	1560	}
idinor	0:dcf3c92487ca	1561	if (flags & TCP_RST) {
idinor	0:dcf3c92487ca	1562	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
idinor	0:dcf3c92487ca	1563	}
idinor	0:dcf3c92487ca	1564	if (flags & TCP_PSH) {
idinor	0:dcf3c92487ca	1565	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
idinor	0:dcf3c92487ca	1566	}
idinor	0:dcf3c92487ca	1567	if (flags & TCP_ACK) {
idinor	0:dcf3c92487ca	1568	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
idinor	0:dcf3c92487ca	1569	}
idinor	0:dcf3c92487ca	1570	if (flags & TCP_URG) {
idinor	0:dcf3c92487ca	1571	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
idinor	0:dcf3c92487ca	1572	}
idinor	0:dcf3c92487ca	1573	if (flags & TCP_ECE) {
idinor	0:dcf3c92487ca	1574	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
idinor	0:dcf3c92487ca	1575	}
idinor	0:dcf3c92487ca	1576	if (flags & TCP_CWR) {
idinor	0:dcf3c92487ca	1577	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
idinor	0:dcf3c92487ca	1578	}
idinor	0:dcf3c92487ca	1579	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
idinor	0:dcf3c92487ca	1580	}
idinor	0:dcf3c92487ca	1581
idinor	0:dcf3c92487ca	1582	/**
idinor	0:dcf3c92487ca	1583	* Print all tcp_pcbs in every list for debugging purposes.
idinor	0:dcf3c92487ca	1584	*/
idinor	0:dcf3c92487ca	1585	void
idinor	0:dcf3c92487ca	1586	tcp_debug_print_pcbs(void)
idinor	0:dcf3c92487ca	1587	{
idinor	0:dcf3c92487ca	1588	struct tcp_pcb *pcb;
idinor	0:dcf3c92487ca	1589	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
idinor	0:dcf3c92487ca	1590	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
idinor	0:dcf3c92487ca	1591	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
idinor	0:dcf3c92487ca	1592	pcb->local_port, pcb->remote_port,
idinor	0:dcf3c92487ca	1593	pcb->snd_nxt, pcb->rcv_nxt));
idinor	0:dcf3c92487ca	1594	tcp_debug_print_state(pcb->state);
idinor	0:dcf3c92487ca	1595	}
idinor	0:dcf3c92487ca	1596	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
idinor	0:dcf3c92487ca	1597	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
idinor	0:dcf3c92487ca	1598	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
idinor	0:dcf3c92487ca	1599	pcb->local_port, pcb->remote_port,
idinor	0:dcf3c92487ca	1600	pcb->snd_nxt, pcb->rcv_nxt));
idinor	0:dcf3c92487ca	1601	tcp_debug_print_state(pcb->state);
idinor	0:dcf3c92487ca	1602	}
idinor	0:dcf3c92487ca	1603	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
idinor	0:dcf3c92487ca	1604	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
idinor	0:dcf3c92487ca	1605	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
idinor	0:dcf3c92487ca	1606	pcb->local_port, pcb->remote_port,
idinor	0:dcf3c92487ca	1607	pcb->snd_nxt, pcb->rcv_nxt));
idinor	0:dcf3c92487ca	1608	tcp_debug_print_state(pcb->state);
idinor	0:dcf3c92487ca	1609	}
idinor	0:dcf3c92487ca	1610	}
idinor	0:dcf3c92487ca	1611
idinor	0:dcf3c92487ca	1612	/**
idinor	0:dcf3c92487ca	1613	* Check state consistency of the tcp_pcb lists.
idinor	0:dcf3c92487ca	1614	*/
idinor	0:dcf3c92487ca	1615	s16_t
idinor	0:dcf3c92487ca	1616	tcp_pcbs_sane(void)
idinor	0:dcf3c92487ca	1617	{
idinor	0:dcf3c92487ca	1618	struct tcp_pcb *pcb;
idinor	0:dcf3c92487ca	1619	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
idinor	0:dcf3c92487ca	1620	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
idinor	0:dcf3c92487ca	1621	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
idinor	0:dcf3c92487ca	1622	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
idinor	0:dcf3c92487ca	1623	}
idinor	0:dcf3c92487ca	1624	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
idinor	0:dcf3c92487ca	1625	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
idinor	0:dcf3c92487ca	1626	}
idinor	0:dcf3c92487ca	1627	return 1;
idinor	0:dcf3c92487ca	1628	}
idinor	0:dcf3c92487ca	1629	#endif /* TCP_DEBUG */
idinor	0:dcf3c92487ca	1630
idinor	0:dcf3c92487ca	1631	#endif /* LWIP_TCP */

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Type:	Library
Created:	20 Jul 2011
Imports:	35
Forks:	0
Commits:	1
Dependents:	1
Dependencies:	0
Followers:	1

lwip/core/tcp.c@0:dcf3c92487ca, 2011-07-20 (annotated)

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