NetServicesMod - Modified version of NetServices. Fixes an issue w…

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Modified version of NetServices. Fixes an issue where connections failed should the HTTP response status line be received in a packet on its own prior to any further headers. Changes are made to the HTTPClient.cpp file's readHeaders method.

lwip/core/tcp.c@0:ec559500a63f, 2011-04-08 (annotated)

Committer:: andrewbonney
Date:: Fri Apr 08 14:39:41 2011 +0000
Revision:: 0:ec559500a63f

Who changed what in which revision?

User	Revision	Line number	New contents of line
andrewbonney	0:ec559500a63f	1	/**
andrewbonney	0:ec559500a63f	2	* @file
andrewbonney	0:ec559500a63f	3	* Transmission Control Protocol for IP
andrewbonney	0:ec559500a63f	4	*
andrewbonney	0:ec559500a63f	5	* This file contains common functions for the TCP implementation, such as functinos
andrewbonney	0:ec559500a63f	6	* for manipulating the data structures and the TCP timer functions. TCP functions
andrewbonney	0:ec559500a63f	7	* related to input and output is found in tcp_in.c and tcp_out.c respectively.
andrewbonney	0:ec559500a63f	8	*
andrewbonney	0:ec559500a63f	9	*/
andrewbonney	0:ec559500a63f	10
andrewbonney	0:ec559500a63f	11	/*
andrewbonney	0:ec559500a63f	12	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
andrewbonney	0:ec559500a63f	13	* All rights reserved.
andrewbonney	0:ec559500a63f	14	*
andrewbonney	0:ec559500a63f	15	* Redistribution and use in source and binary forms, with or without modification,
andrewbonney	0:ec559500a63f	16	* are permitted provided that the following conditions are met:
andrewbonney	0:ec559500a63f	17	*
andrewbonney	0:ec559500a63f	18	* 1. Redistributions of source code must retain the above copyright notice,
andrewbonney	0:ec559500a63f	19	* this list of conditions and the following disclaimer.
andrewbonney	0:ec559500a63f	20	* 2. Redistributions in binary form must reproduce the above copyright notice,
andrewbonney	0:ec559500a63f	21	* this list of conditions and the following disclaimer in the documentation
andrewbonney	0:ec559500a63f	22	* and/or other materials provided with the distribution.
andrewbonney	0:ec559500a63f	23	* 3. The name of the author may not be used to endorse or promote products
andrewbonney	0:ec559500a63f	24	* derived from this software without specific prior written permission.
andrewbonney	0:ec559500a63f	25	*
andrewbonney	0:ec559500a63f	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
andrewbonney	0:ec559500a63f	27	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
andrewbonney	0:ec559500a63f	28	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
andrewbonney	0:ec559500a63f	29	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
andrewbonney	0:ec559500a63f	30	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
andrewbonney	0:ec559500a63f	31	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
andrewbonney	0:ec559500a63f	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
andrewbonney	0:ec559500a63f	33	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
andrewbonney	0:ec559500a63f	34	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
andrewbonney	0:ec559500a63f	35	* OF SUCH DAMAGE.
andrewbonney	0:ec559500a63f	36	*
andrewbonney	0:ec559500a63f	37	* This file is part of the lwIP TCP/IP stack.
andrewbonney	0:ec559500a63f	38	*
andrewbonney	0:ec559500a63f	39	* Author: Adam Dunkels <adam@sics.se>
andrewbonney	0:ec559500a63f	40	*
andrewbonney	0:ec559500a63f	41	*/
andrewbonney	0:ec559500a63f	42
andrewbonney	0:ec559500a63f	43	#include "lwip/opt.h"
andrewbonney	0:ec559500a63f	44
andrewbonney	0:ec559500a63f	45	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
andrewbonney	0:ec559500a63f	46
andrewbonney	0:ec559500a63f	47	#include "lwip/def.h"
andrewbonney	0:ec559500a63f	48	#include "lwip/mem.h"
andrewbonney	0:ec559500a63f	49	#include "lwip/memp.h"
andrewbonney	0:ec559500a63f	50	#include "lwip/snmp.h"
andrewbonney	0:ec559500a63f	51	#include "lwip/tcp.h"
andrewbonney	0:ec559500a63f	52	#include "lwip/tcp_impl.h"
andrewbonney	0:ec559500a63f	53	#include "lwip/debug.h"
andrewbonney	0:ec559500a63f	54	#include "lwip/stats.h"
andrewbonney	0:ec559500a63f	55
andrewbonney	0:ec559500a63f	56	#include <string.h>
andrewbonney	0:ec559500a63f	57
andrewbonney	0:ec559500a63f	58	const char * const tcp_state_str[] = {
andrewbonney	0:ec559500a63f	59	"CLOSED",
andrewbonney	0:ec559500a63f	60	"LISTEN",
andrewbonney	0:ec559500a63f	61	"SYN_SENT",
andrewbonney	0:ec559500a63f	62	"SYN_RCVD",
andrewbonney	0:ec559500a63f	63	"ESTABLISHED",
andrewbonney	0:ec559500a63f	64	"FIN_WAIT_1",
andrewbonney	0:ec559500a63f	65	"FIN_WAIT_2",
andrewbonney	0:ec559500a63f	66	"CLOSE_WAIT",
andrewbonney	0:ec559500a63f	67	"CLOSING",
andrewbonney	0:ec559500a63f	68	"LAST_ACK",
andrewbonney	0:ec559500a63f	69	"TIME_WAIT"
andrewbonney	0:ec559500a63f	70	};
andrewbonney	0:ec559500a63f	71
andrewbonney	0:ec559500a63f	72	/* Incremented every coarse grained timer shot (typically every 500 ms). */
andrewbonney	0:ec559500a63f	73	u32_t tcp_ticks;
andrewbonney	0:ec559500a63f	74	const u8_t tcp_backoff[13] =
andrewbonney	0:ec559500a63f	75	{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
andrewbonney	0:ec559500a63f	76	/* Times per slowtmr hits */
andrewbonney	0:ec559500a63f	77	const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
andrewbonney	0:ec559500a63f	78
andrewbonney	0:ec559500a63f	79	/* The TCP PCB lists. */
andrewbonney	0:ec559500a63f	80
andrewbonney	0:ec559500a63f	81	/** List of all TCP PCBs bound but not yet (connected \|\| listening) */
andrewbonney	0:ec559500a63f	82	struct tcp_pcb *tcp_bound_pcbs;
andrewbonney	0:ec559500a63f	83	/** List of all TCP PCBs in LISTEN state */
andrewbonney	0:ec559500a63f	84	union tcp_listen_pcbs_t tcp_listen_pcbs;
andrewbonney	0:ec559500a63f	85	/** List of all TCP PCBs that are in a state in which
andrewbonney	0:ec559500a63f	86	* they accept or send data. */
andrewbonney	0:ec559500a63f	87	struct tcp_pcb *tcp_active_pcbs;
andrewbonney	0:ec559500a63f	88	/** List of all TCP PCBs in TIME-WAIT state */
andrewbonney	0:ec559500a63f	89	struct tcp_pcb *tcp_tw_pcbs;
andrewbonney	0:ec559500a63f	90
andrewbonney	0:ec559500a63f	91	#define NUM_TCP_PCB_LISTS 4
andrewbonney	0:ec559500a63f	92	#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
andrewbonney	0:ec559500a63f	93	/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
andrewbonney	0:ec559500a63f	94	struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
andrewbonney	0:ec559500a63f	95	&tcp_active_pcbs, &tcp_tw_pcbs};
andrewbonney	0:ec559500a63f	96
andrewbonney	0:ec559500a63f	97	/** Only used for temporary storage. */
andrewbonney	0:ec559500a63f	98	struct tcp_pcb *tcp_tmp_pcb;
andrewbonney	0:ec559500a63f	99
andrewbonney	0:ec559500a63f	100	/** Timer counter to handle calling slow-timer from tcp_tmr() */
andrewbonney	0:ec559500a63f	101	static u8_t tcp_timer;
andrewbonney	0:ec559500a63f	102	static u16_t tcp_new_port(void);
andrewbonney	0:ec559500a63f	103
andrewbonney	0:ec559500a63f	104	/**
andrewbonney	0:ec559500a63f	105	* Called periodically to dispatch TCP timers.
andrewbonney	0:ec559500a63f	106	*
andrewbonney	0:ec559500a63f	107	*/
andrewbonney	0:ec559500a63f	108	void
andrewbonney	0:ec559500a63f	109	tcp_tmr(void)
andrewbonney	0:ec559500a63f	110	{
andrewbonney	0:ec559500a63f	111	/* Call tcp_fasttmr() every 250 ms */
andrewbonney	0:ec559500a63f	112	tcp_fasttmr();
andrewbonney	0:ec559500a63f	113
andrewbonney	0:ec559500a63f	114	if (++tcp_timer & 1) {
andrewbonney	0:ec559500a63f	115	/* Call tcp_tmr() every 500 ms, i.e., every other timer
andrewbonney	0:ec559500a63f	116	tcp_tmr() is called. */
andrewbonney	0:ec559500a63f	117	tcp_slowtmr();
andrewbonney	0:ec559500a63f	118	}
andrewbonney	0:ec559500a63f	119	}
andrewbonney	0:ec559500a63f	120
andrewbonney	0:ec559500a63f	121	/**
andrewbonney	0:ec559500a63f	122	* Closes the TX side of a connection held by the PCB.
andrewbonney	0:ec559500a63f	123	* For tcp_close(), a RST is sent if the application didn't receive all data
andrewbonney	0:ec559500a63f	124	* (tcp_recved() not called for all data passed to recv callback).
andrewbonney	0:ec559500a63f	125	*
andrewbonney	0:ec559500a63f	126	* Listening pcbs are freed and may not be referenced any more.
andrewbonney	0:ec559500a63f	127	* Connection pcbs are freed if not yet connected and may not be referenced
andrewbonney	0:ec559500a63f	128	* any more. If a connection is established (at least SYN received or in
andrewbonney	0:ec559500a63f	129	* a closing state), the connection is closed, and put in a closing state.
andrewbonney	0:ec559500a63f	130	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
andrewbonney	0:ec559500a63f	131	* unsafe to reference it.
andrewbonney	0:ec559500a63f	132	*
andrewbonney	0:ec559500a63f	133	* @param pcb the tcp_pcb to close
andrewbonney	0:ec559500a63f	134	* @return ERR_OK if connection has been closed
andrewbonney	0:ec559500a63f	135	* another err_t if closing failed and pcb is not freed
andrewbonney	0:ec559500a63f	136	*/
andrewbonney	0:ec559500a63f	137	static err_t
andrewbonney	0:ec559500a63f	138	tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
andrewbonney	0:ec559500a63f	139	{
andrewbonney	0:ec559500a63f	140	err_t err;
andrewbonney	0:ec559500a63f	141
andrewbonney	0:ec559500a63f	142	if (rst_on_unacked_data && (pcb->state != LISTEN)) {
andrewbonney	0:ec559500a63f	143	if ((pcb->refused_data != NULL) \|\| (pcb->rcv_wnd != TCP_WND)) {
andrewbonney	0:ec559500a63f	144	/* Not all data received by application, send RST to tell the remote
andrewbonney	0:ec559500a63f	145	side about this. */
andrewbonney	0:ec559500a63f	146	LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
andrewbonney	0:ec559500a63f	147
andrewbonney	0:ec559500a63f	148	/* don't call tcp_abort here: we must not deallocate the pcb since
andrewbonney	0:ec559500a63f	149	that might not be expected when calling tcp_close */
andrewbonney	0:ec559500a63f	150	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
andrewbonney	0:ec559500a63f	151	pcb->local_port, pcb->remote_port);
andrewbonney	0:ec559500a63f	152
andrewbonney	0:ec559500a63f	153	tcp_pcb_purge(pcb);
andrewbonney	0:ec559500a63f	154
andrewbonney	0:ec559500a63f	155	/* TODO: to which state do we move now? */
andrewbonney	0:ec559500a63f	156
andrewbonney	0:ec559500a63f	157	/* move to TIME_WAIT since we close actively */
andrewbonney	0:ec559500a63f	158	TCP_RMV(&tcp_active_pcbs, pcb);
andrewbonney	0:ec559500a63f	159	pcb->state = TIME_WAIT;
andrewbonney	0:ec559500a63f	160	TCP_REG(&tcp_tw_pcbs, pcb);
andrewbonney	0:ec559500a63f	161
andrewbonney	0:ec559500a63f	162	return ERR_OK;
andrewbonney	0:ec559500a63f	163	}
andrewbonney	0:ec559500a63f	164	}
andrewbonney	0:ec559500a63f	165
andrewbonney	0:ec559500a63f	166	switch (pcb->state) {
andrewbonney	0:ec559500a63f	167	case CLOSED:
andrewbonney	0:ec559500a63f	168	/* Closing a pcb in the CLOSED state might seem erroneous,
andrewbonney	0:ec559500a63f	169	* however, it is in this state once allocated and as yet unused
andrewbonney	0:ec559500a63f	170	* and the user needs some way to free it should the need arise.
andrewbonney	0:ec559500a63f	171	* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
andrewbonney	0:ec559500a63f	172	* or for a pcb that has been used and then entered the CLOSED state
andrewbonney	0:ec559500a63f	173	* is erroneous, but this should never happen as the pcb has in those cases
andrewbonney	0:ec559500a63f	174	* been freed, and so any remaining handles are bogus. */
andrewbonney	0:ec559500a63f	175	err = ERR_OK;
andrewbonney	0:ec559500a63f	176	TCP_RMV(&tcp_bound_pcbs, pcb);
andrewbonney	0:ec559500a63f	177	memp_free(MEMP_TCP_PCB, pcb);
andrewbonney	0:ec559500a63f	178	pcb = NULL;
andrewbonney	0:ec559500a63f	179	break;
andrewbonney	0:ec559500a63f	180	case LISTEN:
andrewbonney	0:ec559500a63f	181	err = ERR_OK;
andrewbonney	0:ec559500a63f	182	tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
andrewbonney	0:ec559500a63f	183	memp_free(MEMP_TCP_PCB_LISTEN, pcb);
andrewbonney	0:ec559500a63f	184	pcb = NULL;
andrewbonney	0:ec559500a63f	185	break;
andrewbonney	0:ec559500a63f	186	case SYN_SENT:
andrewbonney	0:ec559500a63f	187	err = ERR_OK;
andrewbonney	0:ec559500a63f	188	tcp_pcb_remove(&tcp_active_pcbs, pcb);
andrewbonney	0:ec559500a63f	189	memp_free(MEMP_TCP_PCB, pcb);
andrewbonney	0:ec559500a63f	190	pcb = NULL;
andrewbonney	0:ec559500a63f	191	snmp_inc_tcpattemptfails();
andrewbonney	0:ec559500a63f	192	break;
andrewbonney	0:ec559500a63f	193	case SYN_RCVD:
andrewbonney	0:ec559500a63f	194	err = tcp_send_fin(pcb);
andrewbonney	0:ec559500a63f	195	if (err == ERR_OK) {
andrewbonney	0:ec559500a63f	196	snmp_inc_tcpattemptfails();
andrewbonney	0:ec559500a63f	197	pcb->state = FIN_WAIT_1;
andrewbonney	0:ec559500a63f	198	}
andrewbonney	0:ec559500a63f	199	break;
andrewbonney	0:ec559500a63f	200	case ESTABLISHED:
andrewbonney	0:ec559500a63f	201	err = tcp_send_fin(pcb);
andrewbonney	0:ec559500a63f	202	if (err == ERR_OK) {
andrewbonney	0:ec559500a63f	203	snmp_inc_tcpestabresets();
andrewbonney	0:ec559500a63f	204	pcb->state = FIN_WAIT_1;
andrewbonney	0:ec559500a63f	205	}
andrewbonney	0:ec559500a63f	206	break;
andrewbonney	0:ec559500a63f	207	case CLOSE_WAIT:
andrewbonney	0:ec559500a63f	208	err = tcp_send_fin(pcb);
andrewbonney	0:ec559500a63f	209	if (err == ERR_OK) {
andrewbonney	0:ec559500a63f	210	snmp_inc_tcpestabresets();
andrewbonney	0:ec559500a63f	211	pcb->state = LAST_ACK;
andrewbonney	0:ec559500a63f	212	}
andrewbonney	0:ec559500a63f	213	break;
andrewbonney	0:ec559500a63f	214	default:
andrewbonney	0:ec559500a63f	215	/* Has already been closed, do nothing. */
andrewbonney	0:ec559500a63f	216	err = ERR_OK;
andrewbonney	0:ec559500a63f	217	pcb = NULL;
andrewbonney	0:ec559500a63f	218	break;
andrewbonney	0:ec559500a63f	219	}
andrewbonney	0:ec559500a63f	220
andrewbonney	0:ec559500a63f	221	if (pcb != NULL && err == ERR_OK) {
andrewbonney	0:ec559500a63f	222	/* To ensure all data has been sent when tcp_close returns, we have
andrewbonney	0:ec559500a63f	223	to make sure tcp_output doesn't fail.
andrewbonney	0:ec559500a63f	224	Since we don't really have to ensure all data has been sent when tcp_close
andrewbonney	0:ec559500a63f	225	returns (unsent data is sent from tcp timer functions, also), we don't care
andrewbonney	0:ec559500a63f	226	for the return value of tcp_output for now. */
andrewbonney	0:ec559500a63f	227	/* @todo: When implementing SO_LINGER, this must be changed somehow:
andrewbonney	0:ec559500a63f	228	If SOF_LINGER is set, the data should be sent and acked before close returns.
andrewbonney	0:ec559500a63f	229	This can only be valid for sequential APIs, not for the raw API. */
andrewbonney	0:ec559500a63f	230	tcp_output(pcb);
andrewbonney	0:ec559500a63f	231	}
andrewbonney	0:ec559500a63f	232	return err;
andrewbonney	0:ec559500a63f	233	}
andrewbonney	0:ec559500a63f	234
andrewbonney	0:ec559500a63f	235	/**
andrewbonney	0:ec559500a63f	236	* Closes the connection held by the PCB.
andrewbonney	0:ec559500a63f	237	*
andrewbonney	0:ec559500a63f	238	* Listening pcbs are freed and may not be referenced any more.
andrewbonney	0:ec559500a63f	239	* Connection pcbs are freed if not yet connected and may not be referenced
andrewbonney	0:ec559500a63f	240	* any more. If a connection is established (at least SYN received or in
andrewbonney	0:ec559500a63f	241	* a closing state), the connection is closed, and put in a closing state.
andrewbonney	0:ec559500a63f	242	* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
andrewbonney	0:ec559500a63f	243	* unsafe to reference it (unless an error is returned).
andrewbonney	0:ec559500a63f	244	*
andrewbonney	0:ec559500a63f	245	* @param pcb the tcp_pcb to close
andrewbonney	0:ec559500a63f	246	* @return ERR_OK if connection has been closed
andrewbonney	0:ec559500a63f	247	* another err_t if closing failed and pcb is not freed
andrewbonney	0:ec559500a63f	248	*/
andrewbonney	0:ec559500a63f	249	err_t
andrewbonney	0:ec559500a63f	250	tcp_close(struct tcp_pcb *pcb)
andrewbonney	0:ec559500a63f	251	{
andrewbonney	0:ec559500a63f	252	#if TCP_DEBUG
andrewbonney	0:ec559500a63f	253	LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
andrewbonney	0:ec559500a63f	254	tcp_debug_print_state(pcb->state);
andrewbonney	0:ec559500a63f	255	#endif /* TCP_DEBUG */
andrewbonney	0:ec559500a63f	256
andrewbonney	0:ec559500a63f	257	if (pcb->state != LISTEN) {
andrewbonney	0:ec559500a63f	258	/* Set a flag not to receive any more data... */
andrewbonney	0:ec559500a63f	259	pcb->flags \|= TF_RXCLOSED;
andrewbonney	0:ec559500a63f	260	}
andrewbonney	0:ec559500a63f	261	/* ... and close */
andrewbonney	0:ec559500a63f	262	return tcp_close_shutdown(pcb, 1);
andrewbonney	0:ec559500a63f	263	}
andrewbonney	0:ec559500a63f	264
andrewbonney	0:ec559500a63f	265	/**
andrewbonney	0:ec559500a63f	266	* Causes all or part of a full-duplex connection of this PCB to be shut down.
andrewbonney	0:ec559500a63f	267	* This doesn't deallocate the PCB!
andrewbonney	0:ec559500a63f	268	*
andrewbonney	0:ec559500a63f	269	* @param pcb PCB to shutdown
andrewbonney	0:ec559500a63f	270	* @param shut_rx shut down receive side if this is != 0
andrewbonney	0:ec559500a63f	271	* @param shut_tx shut down send side if this is != 0
andrewbonney	0:ec559500a63f	272	* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
andrewbonney	0:ec559500a63f	273	* another err_t on error.
andrewbonney	0:ec559500a63f	274	*/
andrewbonney	0:ec559500a63f	275	err_t
andrewbonney	0:ec559500a63f	276	tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
andrewbonney	0:ec559500a63f	277	{
andrewbonney	0:ec559500a63f	278	if (pcb->state == LISTEN) {
andrewbonney	0:ec559500a63f	279	return ERR_CONN;
andrewbonney	0:ec559500a63f	280	}
andrewbonney	0:ec559500a63f	281	if (shut_rx) {
andrewbonney	0:ec559500a63f	282	/* shut down the receive side: free buffered data... */
andrewbonney	0:ec559500a63f	283	if (pcb->refused_data != NULL) {
andrewbonney	0:ec559500a63f	284	pbuf_free(pcb->refused_data);
andrewbonney	0:ec559500a63f	285	pcb->refused_data = NULL;
andrewbonney	0:ec559500a63f	286	}
andrewbonney	0:ec559500a63f	287	/* ... and set a flag not to receive any more data */
andrewbonney	0:ec559500a63f	288	pcb->flags \|= TF_RXCLOSED;
andrewbonney	0:ec559500a63f	289	}
andrewbonney	0:ec559500a63f	290	if (shut_tx) {
andrewbonney	0:ec559500a63f	291	/* This can't happen twice since if it succeeds, the pcb's state is changed.
andrewbonney	0:ec559500a63f	292	Only close in these states as the others directly deallocate the PCB */
andrewbonney	0:ec559500a63f	293	switch (pcb->state) {
andrewbonney	0:ec559500a63f	294	case SYN_RCVD:
andrewbonney	0:ec559500a63f	295	case ESTABLISHED:
andrewbonney	0:ec559500a63f	296	case CLOSE_WAIT:
andrewbonney	0:ec559500a63f	297	return tcp_close_shutdown(pcb, 0);
andrewbonney	0:ec559500a63f	298	default:
andrewbonney	0:ec559500a63f	299	/* don't shut down other states */
andrewbonney	0:ec559500a63f	300	break;
andrewbonney	0:ec559500a63f	301	}
andrewbonney	0:ec559500a63f	302	}
andrewbonney	0:ec559500a63f	303	/* @todo: return another err_t if not in correct state or already shut? */
andrewbonney	0:ec559500a63f	304	return ERR_OK;
andrewbonney	0:ec559500a63f	305	}
andrewbonney	0:ec559500a63f	306
andrewbonney	0:ec559500a63f	307	/**
andrewbonney	0:ec559500a63f	308	* Abandons a connection and optionally sends a RST to the remote
andrewbonney	0:ec559500a63f	309	* host. Deletes the local protocol control block. This is done when
andrewbonney	0:ec559500a63f	310	* a connection is killed because of shortage of memory.
andrewbonney	0:ec559500a63f	311	*
andrewbonney	0:ec559500a63f	312	* @param pcb the tcp_pcb to abort
andrewbonney	0:ec559500a63f	313	* @param reset boolean to indicate whether a reset should be sent
andrewbonney	0:ec559500a63f	314	*/
andrewbonney	0:ec559500a63f	315	void
andrewbonney	0:ec559500a63f	316	tcp_abandon(struct tcp_pcb *pcb, int reset)
andrewbonney	0:ec559500a63f	317	{
andrewbonney	0:ec559500a63f	318	u32_t seqno, ackno;
andrewbonney	0:ec559500a63f	319	u16_t remote_port, local_port;
andrewbonney	0:ec559500a63f	320	ip_addr_t remote_ip, local_ip;
andrewbonney	0:ec559500a63f	321	#if LWIP_CALLBACK_API
andrewbonney	0:ec559500a63f	322	tcp_err_fn errf;
andrewbonney	0:ec559500a63f	323	#endif /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	324	void *errf_arg;
andrewbonney	0:ec559500a63f	325
andrewbonney	0:ec559500a63f	326	/* pcb->state LISTEN not allowed here */
andrewbonney	0:ec559500a63f	327	LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
andrewbonney	0:ec559500a63f	328	pcb->state != LISTEN);
andrewbonney	0:ec559500a63f	329	/* Figure out on which TCP PCB list we are, and remove us. If we
andrewbonney	0:ec559500a63f	330	are in an active state, call the receive function associated with
andrewbonney	0:ec559500a63f	331	the PCB with a NULL argument, and send an RST to the remote end. */
andrewbonney	0:ec559500a63f	332	if (pcb->state == TIME_WAIT) {
andrewbonney	0:ec559500a63f	333	tcp_pcb_remove(&tcp_tw_pcbs, pcb);
andrewbonney	0:ec559500a63f	334	memp_free(MEMP_TCP_PCB, pcb);
andrewbonney	0:ec559500a63f	335	} else {
andrewbonney	0:ec559500a63f	336	seqno = pcb->snd_nxt;
andrewbonney	0:ec559500a63f	337	ackno = pcb->rcv_nxt;
andrewbonney	0:ec559500a63f	338	ip_addr_copy(local_ip, pcb->local_ip);
andrewbonney	0:ec559500a63f	339	ip_addr_copy(remote_ip, pcb->remote_ip);
andrewbonney	0:ec559500a63f	340	local_port = pcb->local_port;
andrewbonney	0:ec559500a63f	341	remote_port = pcb->remote_port;
andrewbonney	0:ec559500a63f	342	#if LWIP_CALLBACK_API
andrewbonney	0:ec559500a63f	343	errf = pcb->errf;
andrewbonney	0:ec559500a63f	344	#endif /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	345	errf_arg = pcb->callback_arg;
andrewbonney	0:ec559500a63f	346	tcp_pcb_remove(&tcp_active_pcbs, pcb);
andrewbonney	0:ec559500a63f	347	if (pcb->unacked != NULL) {
andrewbonney	0:ec559500a63f	348	tcp_segs_free(pcb->unacked);
andrewbonney	0:ec559500a63f	349	}
andrewbonney	0:ec559500a63f	350	if (pcb->unsent != NULL) {
andrewbonney	0:ec559500a63f	351	tcp_segs_free(pcb->unsent);
andrewbonney	0:ec559500a63f	352	}
andrewbonney	0:ec559500a63f	353	#if TCP_QUEUE_OOSEQ
andrewbonney	0:ec559500a63f	354	if (pcb->ooseq != NULL) {
andrewbonney	0:ec559500a63f	355	tcp_segs_free(pcb->ooseq);
andrewbonney	0:ec559500a63f	356	}
andrewbonney	0:ec559500a63f	357	#endif /* TCP_QUEUE_OOSEQ */
andrewbonney	0:ec559500a63f	358	memp_free(MEMP_TCP_PCB, pcb);
andrewbonney	0:ec559500a63f	359	TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
andrewbonney	0:ec559500a63f	360	if (reset) {
andrewbonney	0:ec559500a63f	361	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
andrewbonney	0:ec559500a63f	362	tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
andrewbonney	0:ec559500a63f	363	}
andrewbonney	0:ec559500a63f	364	}
andrewbonney	0:ec559500a63f	365	}
andrewbonney	0:ec559500a63f	366
andrewbonney	0:ec559500a63f	367	/**
andrewbonney	0:ec559500a63f	368	* Aborts the connection by sending a RST (reset) segment to the remote
andrewbonney	0:ec559500a63f	369	* host. The pcb is deallocated. This function never fails.
andrewbonney	0:ec559500a63f	370	*
andrewbonney	0:ec559500a63f	371	* ATTENTION: When calling this from one of the TCP callbacks, make
andrewbonney	0:ec559500a63f	372	* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
andrewbonney	0:ec559500a63f	373	* or you will risk accessing deallocated memory or memory leaks!
andrewbonney	0:ec559500a63f	374	*
andrewbonney	0:ec559500a63f	375	* @param pcb the tcp pcb to abort
andrewbonney	0:ec559500a63f	376	*/
andrewbonney	0:ec559500a63f	377	void
andrewbonney	0:ec559500a63f	378	tcp_abort(struct tcp_pcb *pcb)
andrewbonney	0:ec559500a63f	379	{
andrewbonney	0:ec559500a63f	380	tcp_abandon(pcb, 1);
andrewbonney	0:ec559500a63f	381	}
andrewbonney	0:ec559500a63f	382
andrewbonney	0:ec559500a63f	383	/**
andrewbonney	0:ec559500a63f	384	* Binds the connection to a local portnumber and IP address. If the
andrewbonney	0:ec559500a63f	385	* IP address is not given (i.e., ipaddr == NULL), the IP address of
andrewbonney	0:ec559500a63f	386	* the outgoing network interface is used instead.
andrewbonney	0:ec559500a63f	387	*
andrewbonney	0:ec559500a63f	388	* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
andrewbonney	0:ec559500a63f	389	* already bound!)
andrewbonney	0:ec559500a63f	390	* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
andrewbonney	0:ec559500a63f	391	* to any local address
andrewbonney	0:ec559500a63f	392	* @param port the local port to bind to
andrewbonney	0:ec559500a63f	393	* @return ERR_USE if the port is already in use
andrewbonney	0:ec559500a63f	394	* ERR_OK if bound
andrewbonney	0:ec559500a63f	395	*/
andrewbonney	0:ec559500a63f	396	err_t
andrewbonney	0:ec559500a63f	397	tcp_bind(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port)
andrewbonney	0:ec559500a63f	398	{
andrewbonney	0:ec559500a63f	399	int i;
andrewbonney	0:ec559500a63f	400	int max_pcb_list = NUM_TCP_PCB_LISTS;
andrewbonney	0:ec559500a63f	401	struct tcp_pcb *cpcb;
andrewbonney	0:ec559500a63f	402
andrewbonney	0:ec559500a63f	403	LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
andrewbonney	0:ec559500a63f	404
andrewbonney	0:ec559500a63f	405	#if SO_REUSE
andrewbonney	0:ec559500a63f	406	/* Unless the REUSEADDR flag is set,
andrewbonney	0:ec559500a63f	407	we have to check the pcbs in TIME-WAIT state, also.
andrewbonney	0:ec559500a63f	408	We do not dump TIME_WAIT pcb's; they can still be matched by incoming
andrewbonney	0:ec559500a63f	409	packets using both local and remote IP addresses and ports to distinguish.
andrewbonney	0:ec559500a63f	410	*/
andrewbonney	0:ec559500a63f	411	#if SO_REUSE
andrewbonney	0:ec559500a63f	412	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
andrewbonney	0:ec559500a63f	413	max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
andrewbonney	0:ec559500a63f	414	}
andrewbonney	0:ec559500a63f	415	#endif /* SO_REUSE */
andrewbonney	0:ec559500a63f	416	#endif /* SO_REUSE */
andrewbonney	0:ec559500a63f	417
andrewbonney	0:ec559500a63f	418	if (port == 0) {
andrewbonney	0:ec559500a63f	419	port = tcp_new_port();
andrewbonney	0:ec559500a63f	420	}
andrewbonney	0:ec559500a63f	421
andrewbonney	0:ec559500a63f	422	/* Check if the address already is in use (on all lists) */
andrewbonney	0:ec559500a63f	423	for (i = 0; i < max_pcb_list; i++) {
andrewbonney	0:ec559500a63f	424	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
andrewbonney	0:ec559500a63f	425	if (cpcb->local_port == port) {
andrewbonney	0:ec559500a63f	426	#if SO_REUSE
andrewbonney	0:ec559500a63f	427	/* Omit checking for the same port if both pcbs have REUSEADDR set.
andrewbonney	0:ec559500a63f	428	For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
andrewbonney	0:ec559500a63f	429	tcp_connect. */
andrewbonney	0:ec559500a63f	430	if (((pcb->so_options & SOF_REUSEADDR) == 0) \|\|
andrewbonney	0:ec559500a63f	431	((cpcb->so_options & SOF_REUSEADDR) == 0))
andrewbonney	0:ec559500a63f	432	#endif /* SO_REUSE */
andrewbonney	0:ec559500a63f	433	{
andrewbonney	0:ec559500a63f	434	if (ip_addr_isany(&(cpcb->local_ip)) \|\|
andrewbonney	0:ec559500a63f	435	ip_addr_isany(ipaddr) \|\|
andrewbonney	0:ec559500a63f	436	ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
andrewbonney	0:ec559500a63f	437	return ERR_USE;
andrewbonney	0:ec559500a63f	438	}
andrewbonney	0:ec559500a63f	439	}
andrewbonney	0:ec559500a63f	440	}
andrewbonney	0:ec559500a63f	441	}
andrewbonney	0:ec559500a63f	442	}
andrewbonney	0:ec559500a63f	443
andrewbonney	0:ec559500a63f	444	if (!ip_addr_isany(ipaddr)) {
andrewbonney	0:ec559500a63f	445	pcb->local_ip = *ipaddr;
andrewbonney	0:ec559500a63f	446	}
andrewbonney	0:ec559500a63f	447	pcb->local_port = port;
andrewbonney	0:ec559500a63f	448	TCP_REG(&tcp_bound_pcbs, pcb);
andrewbonney	0:ec559500a63f	449	LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
andrewbonney	0:ec559500a63f	450	return ERR_OK;
andrewbonney	0:ec559500a63f	451	}
andrewbonney	0:ec559500a63f	452	#if LWIP_CALLBACK_API
andrewbonney	0:ec559500a63f	453	/**
andrewbonney	0:ec559500a63f	454	* Default accept callback if no accept callback is specified by the user.
andrewbonney	0:ec559500a63f	455	*/
andrewbonney	0:ec559500a63f	456	static err_t
andrewbonney	0:ec559500a63f	457	tcp_accept_null(void arg, struct tcp_pcb pcb, err_t err)
andrewbonney	0:ec559500a63f	458	{
andrewbonney	0:ec559500a63f	459	LWIP_UNUSED_ARG(arg);
andrewbonney	0:ec559500a63f	460	LWIP_UNUSED_ARG(pcb);
andrewbonney	0:ec559500a63f	461	LWIP_UNUSED_ARG(err);
andrewbonney	0:ec559500a63f	462
andrewbonney	0:ec559500a63f	463	return ERR_ABRT;
andrewbonney	0:ec559500a63f	464	}
andrewbonney	0:ec559500a63f	465	#endif /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	466
andrewbonney	0:ec559500a63f	467	/**
andrewbonney	0:ec559500a63f	468	* Set the state of the connection to be LISTEN, which means that it
andrewbonney	0:ec559500a63f	469	* is able to accept incoming connections. The protocol control block
andrewbonney	0:ec559500a63f	470	* is reallocated in order to consume less memory. Setting the
andrewbonney	0:ec559500a63f	471	* connection to LISTEN is an irreversible process.
andrewbonney	0:ec559500a63f	472	*
andrewbonney	0:ec559500a63f	473	* @param pcb the original tcp_pcb
andrewbonney	0:ec559500a63f	474	* @param backlog the incoming connections queue limit
andrewbonney	0:ec559500a63f	475	* @return tcp_pcb used for listening, consumes less memory.
andrewbonney	0:ec559500a63f	476	*
andrewbonney	0:ec559500a63f	477	* @note The original tcp_pcb is freed. This function therefore has to be
andrewbonney	0:ec559500a63f	478	* called like this:
andrewbonney	0:ec559500a63f	479	* tpcb = tcp_listen(tpcb);
andrewbonney	0:ec559500a63f	480	*/
andrewbonney	0:ec559500a63f	481	struct tcp_pcb *
andrewbonney	0:ec559500a63f	482	tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
andrewbonney	0:ec559500a63f	483	{
andrewbonney	0:ec559500a63f	484	struct tcp_pcb_listen *lpcb;
andrewbonney	0:ec559500a63f	485
andrewbonney	0:ec559500a63f	486	LWIP_UNUSED_ARG(backlog);
andrewbonney	0:ec559500a63f	487	LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
andrewbonney	0:ec559500a63f	488
andrewbonney	0:ec559500a63f	489	/* already listening? */
andrewbonney	0:ec559500a63f	490	if (pcb->state == LISTEN) {
andrewbonney	0:ec559500a63f	491	return pcb;
andrewbonney	0:ec559500a63f	492	}
andrewbonney	0:ec559500a63f	493	#if SO_REUSE
andrewbonney	0:ec559500a63f	494	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
andrewbonney	0:ec559500a63f	495	/* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
andrewbonney	0:ec559500a63f	496	is declared (listen-/connection-pcb), we have to make sure now that
andrewbonney	0:ec559500a63f	497	this port is only used once for every local IP. */
andrewbonney	0:ec559500a63f	498	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
andrewbonney	0:ec559500a63f	499	if (lpcb->local_port == pcb->local_port) {
andrewbonney	0:ec559500a63f	500	if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
andrewbonney	0:ec559500a63f	501	/* this address/port is already used */
andrewbonney	0:ec559500a63f	502	return NULL;
andrewbonney	0:ec559500a63f	503	}
andrewbonney	0:ec559500a63f	504	}
andrewbonney	0:ec559500a63f	505	}
andrewbonney	0:ec559500a63f	506	}
andrewbonney	0:ec559500a63f	507	#endif /* SO_REUSE */
andrewbonney	0:ec559500a63f	508	lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
andrewbonney	0:ec559500a63f	509	if (lpcb == NULL) {
andrewbonney	0:ec559500a63f	510	return NULL;
andrewbonney	0:ec559500a63f	511	}
andrewbonney	0:ec559500a63f	512	lpcb->callback_arg = pcb->callback_arg;
andrewbonney	0:ec559500a63f	513	lpcb->local_port = pcb->local_port;
andrewbonney	0:ec559500a63f	514	lpcb->state = LISTEN;
andrewbonney	0:ec559500a63f	515	lpcb->prio = pcb->prio;
andrewbonney	0:ec559500a63f	516	lpcb->so_options = pcb->so_options;
andrewbonney	0:ec559500a63f	517	lpcb->so_options \|= SOF_ACCEPTCONN;
andrewbonney	0:ec559500a63f	518	lpcb->ttl = pcb->ttl;
andrewbonney	0:ec559500a63f	519	lpcb->tos = pcb->tos;
andrewbonney	0:ec559500a63f	520	ip_addr_copy(lpcb->local_ip, pcb->local_ip);
andrewbonney	0:ec559500a63f	521	TCP_RMV(&tcp_bound_pcbs, pcb);
andrewbonney	0:ec559500a63f	522	memp_free(MEMP_TCP_PCB, pcb);
andrewbonney	0:ec559500a63f	523	#if LWIP_CALLBACK_API
andrewbonney	0:ec559500a63f	524	lpcb->accept = tcp_accept_null;
andrewbonney	0:ec559500a63f	525	#endif /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	526	#if TCP_LISTEN_BACKLOG
andrewbonney	0:ec559500a63f	527	lpcb->accepts_pending = 0;
andrewbonney	0:ec559500a63f	528	lpcb->backlog = (backlog ? backlog : 1);
andrewbonney	0:ec559500a63f	529	#endif /* TCP_LISTEN_BACKLOG */
andrewbonney	0:ec559500a63f	530	TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
andrewbonney	0:ec559500a63f	531	return (struct tcp_pcb *)lpcb;
andrewbonney	0:ec559500a63f	532	}
andrewbonney	0:ec559500a63f	533
andrewbonney	0:ec559500a63f	534	/**
andrewbonney	0:ec559500a63f	535	* Update the state that tracks the available window space to advertise.
andrewbonney	0:ec559500a63f	536	*
andrewbonney	0:ec559500a63f	537	* Returns how much extra window would be advertised if we sent an
andrewbonney	0:ec559500a63f	538	* update now.
andrewbonney	0:ec559500a63f	539	*/
andrewbonney	0:ec559500a63f	540	u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
andrewbonney	0:ec559500a63f	541	{
andrewbonney	0:ec559500a63f	542	u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
andrewbonney	0:ec559500a63f	543
andrewbonney	0:ec559500a63f	544	if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
andrewbonney	0:ec559500a63f	545	/* we can advertise more window */
andrewbonney	0:ec559500a63f	546	pcb->rcv_ann_wnd = pcb->rcv_wnd;
andrewbonney	0:ec559500a63f	547	return new_right_edge - pcb->rcv_ann_right_edge;
andrewbonney	0:ec559500a63f	548	} else {
andrewbonney	0:ec559500a63f	549	if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
andrewbonney	0:ec559500a63f	550	/* Can happen due to other end sending out of advertised window,
andrewbonney	0:ec559500a63f	551	* but within actual available (but not yet advertised) window */
andrewbonney	0:ec559500a63f	552	pcb->rcv_ann_wnd = 0;
andrewbonney	0:ec559500a63f	553	} else {
andrewbonney	0:ec559500a63f	554	/* keep the right edge of window constant */
andrewbonney	0:ec559500a63f	555	u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
andrewbonney	0:ec559500a63f	556	LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
andrewbonney	0:ec559500a63f	557	pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
andrewbonney	0:ec559500a63f	558	}
andrewbonney	0:ec559500a63f	559	return 0;
andrewbonney	0:ec559500a63f	560	}
andrewbonney	0:ec559500a63f	561	}
andrewbonney	0:ec559500a63f	562
andrewbonney	0:ec559500a63f	563	/**
andrewbonney	0:ec559500a63f	564	* This function should be called by the application when it has
andrewbonney	0:ec559500a63f	565	* processed the data. The purpose is to advertise a larger window
andrewbonney	0:ec559500a63f	566	* when the data has been processed.
andrewbonney	0:ec559500a63f	567	*
andrewbonney	0:ec559500a63f	568	* @param pcb the tcp_pcb for which data is read
andrewbonney	0:ec559500a63f	569	* @param len the amount of bytes that have been read by the application
andrewbonney	0:ec559500a63f	570	*/
andrewbonney	0:ec559500a63f	571	void
andrewbonney	0:ec559500a63f	572	tcp_recved(struct tcp_pcb *pcb, u16_t len)
andrewbonney	0:ec559500a63f	573	{
andrewbonney	0:ec559500a63f	574	int wnd_inflation;
andrewbonney	0:ec559500a63f	575
andrewbonney	0:ec559500a63f	576	LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
andrewbonney	0:ec559500a63f	577	len <= 0xffff - pcb->rcv_wnd );
andrewbonney	0:ec559500a63f	578
andrewbonney	0:ec559500a63f	579	pcb->rcv_wnd += len;
andrewbonney	0:ec559500a63f	580	if (pcb->rcv_wnd > TCP_WND) {
andrewbonney	0:ec559500a63f	581	pcb->rcv_wnd = TCP_WND;
andrewbonney	0:ec559500a63f	582	}
andrewbonney	0:ec559500a63f	583
andrewbonney	0:ec559500a63f	584	wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
andrewbonney	0:ec559500a63f	585
andrewbonney	0:ec559500a63f	586	/* If the change in the right edge of window is significant (default
andrewbonney	0:ec559500a63f	587	* watermark is TCP_WND/4), then send an explicit update now.
andrewbonney	0:ec559500a63f	588	* Otherwise wait for a packet to be sent in the normal course of
andrewbonney	0:ec559500a63f	589	* events (or more window to be available later) */
andrewbonney	0:ec559500a63f	590	if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
andrewbonney	0:ec559500a63f	591	tcp_ack_now(pcb);
andrewbonney	0:ec559500a63f	592	tcp_output(pcb);
andrewbonney	0:ec559500a63f	593	}
andrewbonney	0:ec559500a63f	594
andrewbonney	0:ec559500a63f	595	LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
andrewbonney	0:ec559500a63f	596	len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
andrewbonney	0:ec559500a63f	597	}
andrewbonney	0:ec559500a63f	598
andrewbonney	0:ec559500a63f	599	/**
andrewbonney	0:ec559500a63f	600	* A nastly hack featuring 'goto' statements that allocates a
andrewbonney	0:ec559500a63f	601	* new TCP local port.
andrewbonney	0:ec559500a63f	602	*
andrewbonney	0:ec559500a63f	603	* @return a new (free) local TCP port number
andrewbonney	0:ec559500a63f	604	*/
andrewbonney	0:ec559500a63f	605	static u16_t
andrewbonney	0:ec559500a63f	606	tcp_new_port(void)
andrewbonney	0:ec559500a63f	607	{
andrewbonney	0:ec559500a63f	608	int i;
andrewbonney	0:ec559500a63f	609	struct tcp_pcb *pcb;
andrewbonney	0:ec559500a63f	610	#ifndef TCP_LOCAL_PORT_RANGE_START
andrewbonney	0:ec559500a63f	611	#define TCP_LOCAL_PORT_RANGE_START 4096
andrewbonney	0:ec559500a63f	612	#define TCP_LOCAL_PORT_RANGE_END 0x7fff
andrewbonney	0:ec559500a63f	613	#endif
andrewbonney	0:ec559500a63f	614	static u16_t port = TCP_LOCAL_PORT_RANGE_START;
andrewbonney	0:ec559500a63f	615
andrewbonney	0:ec559500a63f	616	again:
andrewbonney	0:ec559500a63f	617	if (++port > TCP_LOCAL_PORT_RANGE_END) {
andrewbonney	0:ec559500a63f	618	port = TCP_LOCAL_PORT_RANGE_START;
andrewbonney	0:ec559500a63f	619	}
andrewbonney	0:ec559500a63f	620	/* Check all PCB lists. */
andrewbonney	0:ec559500a63f	621	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
andrewbonney	0:ec559500a63f	622	for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
andrewbonney	0:ec559500a63f	623	if (pcb->local_port == port) {
andrewbonney	0:ec559500a63f	624	goto again;
andrewbonney	0:ec559500a63f	625	}
andrewbonney	0:ec559500a63f	626	}
andrewbonney	0:ec559500a63f	627	}
andrewbonney	0:ec559500a63f	628	return port;
andrewbonney	0:ec559500a63f	629	}
andrewbonney	0:ec559500a63f	630
andrewbonney	0:ec559500a63f	631	/**
andrewbonney	0:ec559500a63f	632	* Connects to another host. The function given as the "connected"
andrewbonney	0:ec559500a63f	633	* argument will be called when the connection has been established.
andrewbonney	0:ec559500a63f	634	*
andrewbonney	0:ec559500a63f	635	* @param pcb the tcp_pcb used to establish the connection
andrewbonney	0:ec559500a63f	636	* @param ipaddr the remote ip address to connect to
andrewbonney	0:ec559500a63f	637	* @param port the remote tcp port to connect to
andrewbonney	0:ec559500a63f	638	* @param connected callback function to call when connected (or on error)
andrewbonney	0:ec559500a63f	639	* @return ERR_VAL if invalid arguments are given
andrewbonney	0:ec559500a63f	640	* ERR_OK if connect request has been sent
andrewbonney	0:ec559500a63f	641	* other err_t values if connect request couldn't be sent
andrewbonney	0:ec559500a63f	642	*/
andrewbonney	0:ec559500a63f	643	err_t
andrewbonney	0:ec559500a63f	644	tcp_connect(struct tcp_pcb pcb, ip_addr_t ipaddr, u16_t port,
andrewbonney	0:ec559500a63f	645	tcp_connected_fn connected)
andrewbonney	0:ec559500a63f	646	{
andrewbonney	0:ec559500a63f	647	err_t ret;
andrewbonney	0:ec559500a63f	648	u32_t iss;
andrewbonney	0:ec559500a63f	649
andrewbonney	0:ec559500a63f	650	LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
andrewbonney	0:ec559500a63f	651
andrewbonney	0:ec559500a63f	652	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
andrewbonney	0:ec559500a63f	653	if (ipaddr != NULL) {
andrewbonney	0:ec559500a63f	654	pcb->remote_ip = *ipaddr;
andrewbonney	0:ec559500a63f	655	} else {
andrewbonney	0:ec559500a63f	656	return ERR_VAL;
andrewbonney	0:ec559500a63f	657	}
andrewbonney	0:ec559500a63f	658	pcb->remote_port = port;
andrewbonney	0:ec559500a63f	659
andrewbonney	0:ec559500a63f	660	/* check if we have a route to the remote host */
andrewbonney	0:ec559500a63f	661	if (ip_addr_isany(&(pcb->local_ip))) {
andrewbonney	0:ec559500a63f	662	/* no local IP address set, yet. */
andrewbonney	0:ec559500a63f	663	struct netif *netif = ip_route(&(pcb->remote_ip));
andrewbonney	0:ec559500a63f	664	if (netif == NULL) {
andrewbonney	0:ec559500a63f	665	/* Don't even try to send a SYN packet if we have no route
andrewbonney	0:ec559500a63f	666	since that will fail. */
andrewbonney	0:ec559500a63f	667	return ERR_RTE;
andrewbonney	0:ec559500a63f	668	}
andrewbonney	0:ec559500a63f	669	/* Use the netif's IP address as local address. */
andrewbonney	0:ec559500a63f	670	ip_addr_copy(pcb->local_ip, netif->ip_addr);
andrewbonney	0:ec559500a63f	671	}
andrewbonney	0:ec559500a63f	672
andrewbonney	0:ec559500a63f	673	if (pcb->local_port == 0) {
andrewbonney	0:ec559500a63f	674	pcb->local_port = tcp_new_port();
andrewbonney	0:ec559500a63f	675	}
andrewbonney	0:ec559500a63f	676	#if SO_REUSE
andrewbonney	0:ec559500a63f	677	if ((pcb->so_options & SOF_REUSEADDR) != 0) {
andrewbonney	0:ec559500a63f	678	/* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
andrewbonney	0:ec559500a63f	679	now that the 5-tuple is unique. */
andrewbonney	0:ec559500a63f	680	struct tcp_pcb *cpcb;
andrewbonney	0:ec559500a63f	681	int i;
andrewbonney	0:ec559500a63f	682	/* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
andrewbonney	0:ec559500a63f	683	for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
andrewbonney	0:ec559500a63f	684	for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
andrewbonney	0:ec559500a63f	685	if ((cpcb->local_port == pcb->local_port) &&
andrewbonney	0:ec559500a63f	686	(cpcb->remote_port == port) &&
andrewbonney	0:ec559500a63f	687	ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
andrewbonney	0:ec559500a63f	688	ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
andrewbonney	0:ec559500a63f	689	/* linux returns EISCONN here, but ERR_USE should be OK for us */
andrewbonney	0:ec559500a63f	690	return ERR_USE;
andrewbonney	0:ec559500a63f	691	}
andrewbonney	0:ec559500a63f	692	}
andrewbonney	0:ec559500a63f	693	}
andrewbonney	0:ec559500a63f	694	}
andrewbonney	0:ec559500a63f	695	#endif /* SO_REUSE */
andrewbonney	0:ec559500a63f	696	iss = tcp_next_iss();
andrewbonney	0:ec559500a63f	697	pcb->rcv_nxt = 0;
andrewbonney	0:ec559500a63f	698	pcb->snd_nxt = iss;
andrewbonney	0:ec559500a63f	699	pcb->lastack = iss - 1;
andrewbonney	0:ec559500a63f	700	pcb->snd_lbb = iss - 1;
andrewbonney	0:ec559500a63f	701	pcb->rcv_wnd = TCP_WND;
andrewbonney	0:ec559500a63f	702	pcb->rcv_ann_wnd = TCP_WND;
andrewbonney	0:ec559500a63f	703	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
andrewbonney	0:ec559500a63f	704	pcb->snd_wnd = TCP_WND;
andrewbonney	0:ec559500a63f	705	/* As initial send MSS, we use TCP_MSS but limit it to 536.
andrewbonney	0:ec559500a63f	706	The send MSS is updated when an MSS option is received. */
andrewbonney	0:ec559500a63f	707	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
andrewbonney	0:ec559500a63f	708	#if TCP_CALCULATE_EFF_SEND_MSS
andrewbonney	0:ec559500a63f	709	pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
andrewbonney	0:ec559500a63f	710	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
andrewbonney	0:ec559500a63f	711	pcb->cwnd = 1;
andrewbonney	0:ec559500a63f	712	pcb->ssthresh = pcb->mss * 10;
andrewbonney	0:ec559500a63f	713	#if LWIP_CALLBACK_API
andrewbonney	0:ec559500a63f	714	pcb->connected = connected;
andrewbonney	0:ec559500a63f	715	#else /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	716	LWIP_UNUSED_ARG(connected);
andrewbonney	0:ec559500a63f	717	#endif /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	718
andrewbonney	0:ec559500a63f	719	LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
andrewbonney	0:ec559500a63f	720
andrewbonney	0:ec559500a63f	721	/* Send a SYN together with the MSS option. */
andrewbonney	0:ec559500a63f	722	ret = tcp_enqueue_flags(pcb, TCP_SYN);
andrewbonney	0:ec559500a63f	723	if (ret == ERR_OK) {
andrewbonney	0:ec559500a63f	724	/* SYN segment was enqueued, changed the pcbs state now */
andrewbonney	0:ec559500a63f	725	pcb->state = SYN_SENT;
andrewbonney	0:ec559500a63f	726	TCP_RMV(&tcp_bound_pcbs, pcb);
andrewbonney	0:ec559500a63f	727	TCP_REG(&tcp_active_pcbs, pcb);
andrewbonney	0:ec559500a63f	728	snmp_inc_tcpactiveopens();
andrewbonney	0:ec559500a63f	729
andrewbonney	0:ec559500a63f	730	tcp_output(pcb);
andrewbonney	0:ec559500a63f	731	}
andrewbonney	0:ec559500a63f	732	return ret;
andrewbonney	0:ec559500a63f	733	}
andrewbonney	0:ec559500a63f	734
andrewbonney	0:ec559500a63f	735	/**
andrewbonney	0:ec559500a63f	736	* Called every 500 ms and implements the retransmission timer and the timer that
andrewbonney	0:ec559500a63f	737	* removes PCBs that have been in TIME-WAIT for enough time. It also increments
andrewbonney	0:ec559500a63f	738	* various timers such as the inactivity timer in each PCB.
andrewbonney	0:ec559500a63f	739	*
andrewbonney	0:ec559500a63f	740	* Automatically called from tcp_tmr().
andrewbonney	0:ec559500a63f	741	*/
andrewbonney	0:ec559500a63f	742	void
andrewbonney	0:ec559500a63f	743	tcp_slowtmr(void)
andrewbonney	0:ec559500a63f	744	{
andrewbonney	0:ec559500a63f	745	struct tcp_pcb pcb, pcb2, *prev;
andrewbonney	0:ec559500a63f	746	u16_t eff_wnd;
andrewbonney	0:ec559500a63f	747	u8_t pcb_remove; /* flag if a PCB should be removed */
andrewbonney	0:ec559500a63f	748	u8_t pcb_reset; /* flag if a RST should be sent when removing */
andrewbonney	0:ec559500a63f	749	err_t err;
andrewbonney	0:ec559500a63f	750
andrewbonney	0:ec559500a63f	751	tcp_debug_print_pcbs(); //DG
andrewbonney	0:ec559500a63f	752
andrewbonney	0:ec559500a63f	753	err = ERR_OK;
andrewbonney	0:ec559500a63f	754
andrewbonney	0:ec559500a63f	755	++tcp_ticks;
andrewbonney	0:ec559500a63f	756	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
andrewbonney	0:ec559500a63f	757
andrewbonney	0:ec559500a63f	758	/* Steps through all of the active PCBs. */
andrewbonney	0:ec559500a63f	759	prev = NULL;
andrewbonney	0:ec559500a63f	760	pcb = tcp_active_pcbs;
andrewbonney	0:ec559500a63f	761	if (pcb == NULL) {
andrewbonney	0:ec559500a63f	762	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
andrewbonney	0:ec559500a63f	763	}
andrewbonney	0:ec559500a63f	764	while (pcb != NULL) {
andrewbonney	0:ec559500a63f	765	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
andrewbonney	0:ec559500a63f	766	LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
andrewbonney	0:ec559500a63f	767	LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
andrewbonney	0:ec559500a63f	768	LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
andrewbonney	0:ec559500a63f	769
andrewbonney	0:ec559500a63f	770	pcb_remove = 0;
andrewbonney	0:ec559500a63f	771	pcb_reset = 0;
andrewbonney	0:ec559500a63f	772
andrewbonney	0:ec559500a63f	773	if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
andrewbonney	0:ec559500a63f	774	++pcb_remove;
andrewbonney	0:ec559500a63f	775	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
andrewbonney	0:ec559500a63f	776	}
andrewbonney	0:ec559500a63f	777	else if (pcb->nrtx == TCP_MAXRTX) {
andrewbonney	0:ec559500a63f	778	++pcb_remove;
andrewbonney	0:ec559500a63f	779	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
andrewbonney	0:ec559500a63f	780	} else {
andrewbonney	0:ec559500a63f	781	if (pcb->persist_backoff > 0) {
andrewbonney	0:ec559500a63f	782	/* If snd_wnd is zero, use persist timer to send 1 byte probes
andrewbonney	0:ec559500a63f	783	* instead of using the standard retransmission mechanism. */
andrewbonney	0:ec559500a63f	784	pcb->persist_cnt++;
andrewbonney	0:ec559500a63f	785	if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
andrewbonney	0:ec559500a63f	786	pcb->persist_cnt = 0;
andrewbonney	0:ec559500a63f	787	if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
andrewbonney	0:ec559500a63f	788	pcb->persist_backoff++;
andrewbonney	0:ec559500a63f	789	}
andrewbonney	0:ec559500a63f	790	tcp_zero_window_probe(pcb);
andrewbonney	0:ec559500a63f	791	}
andrewbonney	0:ec559500a63f	792	} else {
andrewbonney	0:ec559500a63f	793	/* Increase the retransmission timer if it is running */
andrewbonney	0:ec559500a63f	794	if(pcb->rtime >= 0)
andrewbonney	0:ec559500a63f	795	++pcb->rtime;
andrewbonney	0:ec559500a63f	796
andrewbonney	0:ec559500a63f	797	if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
andrewbonney	0:ec559500a63f	798	/* Time for a retransmission. */
andrewbonney	0:ec559500a63f	799	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
andrewbonney	0:ec559500a63f	800	" pcb->rto %"S16_F"\n",
andrewbonney	0:ec559500a63f	801	pcb->rtime, pcb->rto));
andrewbonney	0:ec559500a63f	802
andrewbonney	0:ec559500a63f	803	/* Double retransmission time-out unless we are trying to
andrewbonney	0:ec559500a63f	804	* connect to somebody (i.e., we are in SYN_SENT). */
andrewbonney	0:ec559500a63f	805	if (pcb->state != SYN_SENT) {
andrewbonney	0:ec559500a63f	806	pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
andrewbonney	0:ec559500a63f	807	}
andrewbonney	0:ec559500a63f	808
andrewbonney	0:ec559500a63f	809	/* Reset the retransmission timer. */
andrewbonney	0:ec559500a63f	810	pcb->rtime = 0;
andrewbonney	0:ec559500a63f	811
andrewbonney	0:ec559500a63f	812	/* Reduce congestion window and ssthresh. */
andrewbonney	0:ec559500a63f	813	eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
andrewbonney	0:ec559500a63f	814	pcb->ssthresh = eff_wnd >> 1;
andrewbonney	0:ec559500a63f	815	if (pcb->ssthresh < (pcb->mss << 1)) {
andrewbonney	0:ec559500a63f	816	pcb->ssthresh = (pcb->mss << 1);
andrewbonney	0:ec559500a63f	817	}
andrewbonney	0:ec559500a63f	818	pcb->cwnd = pcb->mss;
andrewbonney	0:ec559500a63f	819	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
andrewbonney	0:ec559500a63f	820	" ssthresh %"U16_F"\n",
andrewbonney	0:ec559500a63f	821	pcb->cwnd, pcb->ssthresh));
andrewbonney	0:ec559500a63f	822
andrewbonney	0:ec559500a63f	823	/* The following needs to be called AFTER cwnd is set to one
andrewbonney	0:ec559500a63f	824	mss - STJ */
andrewbonney	0:ec559500a63f	825	tcp_rexmit_rto(pcb);
andrewbonney	0:ec559500a63f	826	}
andrewbonney	0:ec559500a63f	827	}
andrewbonney	0:ec559500a63f	828	}
andrewbonney	0:ec559500a63f	829	/* Check if this PCB has stayed too long in FIN-WAIT-2 */
andrewbonney	0:ec559500a63f	830	if (pcb->state == FIN_WAIT_2) {
andrewbonney	0:ec559500a63f	831	if ((u32_t)(tcp_ticks - pcb->tmr) >
andrewbonney	0:ec559500a63f	832	TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
andrewbonney	0:ec559500a63f	833	++pcb_remove;
andrewbonney	0:ec559500a63f	834	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
andrewbonney	0:ec559500a63f	835	}
andrewbonney	0:ec559500a63f	836	}
andrewbonney	0:ec559500a63f	837
andrewbonney	0:ec559500a63f	838	/* Check if KEEPALIVE should be sent */
andrewbonney	0:ec559500a63f	839	if((pcb->so_options & SOF_KEEPALIVE) &&
andrewbonney	0:ec559500a63f	840	((pcb->state == ESTABLISHED) \|\|
andrewbonney	0:ec559500a63f	841	(pcb->state == CLOSE_WAIT))) {
andrewbonney	0:ec559500a63f	842	#if LWIP_TCP_KEEPALIVE
andrewbonney	0:ec559500a63f	843	if((u32_t)(tcp_ticks - pcb->tmr) >
andrewbonney	0:ec559500a63f	844	(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
andrewbonney	0:ec559500a63f	845	/ TCP_SLOW_INTERVAL)
andrewbonney	0:ec559500a63f	846	#else
andrewbonney	0:ec559500a63f	847	if((u32_t)(tcp_ticks - pcb->tmr) >
andrewbonney	0:ec559500a63f	848	(pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
andrewbonney	0:ec559500a63f	849	#endif /* LWIP_TCP_KEEPALIVE */
andrewbonney	0:ec559500a63f	850	{
andrewbonney	0:ec559500a63f	851	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
andrewbonney	0:ec559500a63f	852	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
andrewbonney	0:ec559500a63f	853	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
andrewbonney	0:ec559500a63f	854
andrewbonney	0:ec559500a63f	855	++pcb_remove;
andrewbonney	0:ec559500a63f	856	++pcb_reset;
andrewbonney	0:ec559500a63f	857	}
andrewbonney	0:ec559500a63f	858	#if LWIP_TCP_KEEPALIVE
andrewbonney	0:ec559500a63f	859	else if((u32_t)(tcp_ticks - pcb->tmr) >
andrewbonney	0:ec559500a63f	860	(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
andrewbonney	0:ec559500a63f	861	/ TCP_SLOW_INTERVAL)
andrewbonney	0:ec559500a63f	862	#else
andrewbonney	0:ec559500a63f	863	else if((u32_t)(tcp_ticks - pcb->tmr) >
andrewbonney	0:ec559500a63f	864	(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
andrewbonney	0:ec559500a63f	865	/ TCP_SLOW_INTERVAL)
andrewbonney	0:ec559500a63f	866	#endif /* LWIP_TCP_KEEPALIVE */
andrewbonney	0:ec559500a63f	867	{
andrewbonney	0:ec559500a63f	868	tcp_keepalive(pcb);
andrewbonney	0:ec559500a63f	869	pcb->keep_cnt_sent++;
andrewbonney	0:ec559500a63f	870	}
andrewbonney	0:ec559500a63f	871	}
andrewbonney	0:ec559500a63f	872
andrewbonney	0:ec559500a63f	873	/* If this PCB has queued out of sequence data, but has been
andrewbonney	0:ec559500a63f	874	inactive for too long, will drop the data (it will eventually
andrewbonney	0:ec559500a63f	875	be retransmitted). */
andrewbonney	0:ec559500a63f	876	#if TCP_QUEUE_OOSEQ
andrewbonney	0:ec559500a63f	877	if (pcb->ooseq != NULL &&
andrewbonney	0:ec559500a63f	878	(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
andrewbonney	0:ec559500a63f	879	tcp_segs_free(pcb->ooseq);
andrewbonney	0:ec559500a63f	880	pcb->ooseq = NULL;
andrewbonney	0:ec559500a63f	881	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
andrewbonney	0:ec559500a63f	882	}
andrewbonney	0:ec559500a63f	883	#endif /* TCP_QUEUE_OOSEQ */
andrewbonney	0:ec559500a63f	884
andrewbonney	0:ec559500a63f	885	/* Check if this PCB has stayed too long in SYN-RCVD */
andrewbonney	0:ec559500a63f	886	if (pcb->state == SYN_RCVD) {
andrewbonney	0:ec559500a63f	887	if ((u32_t)(tcp_ticks - pcb->tmr) >
andrewbonney	0:ec559500a63f	888	TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
andrewbonney	0:ec559500a63f	889	++pcb_remove;
andrewbonney	0:ec559500a63f	890	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
andrewbonney	0:ec559500a63f	891	}
andrewbonney	0:ec559500a63f	892	}
andrewbonney	0:ec559500a63f	893
andrewbonney	0:ec559500a63f	894	/* Check if this PCB has stayed too long in LAST-ACK */
andrewbonney	0:ec559500a63f	895	if (pcb->state == LAST_ACK) {
andrewbonney	0:ec559500a63f	896	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
andrewbonney	0:ec559500a63f	897	++pcb_remove;
andrewbonney	0:ec559500a63f	898	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
andrewbonney	0:ec559500a63f	899	}
andrewbonney	0:ec559500a63f	900	}
andrewbonney	0:ec559500a63f	901
andrewbonney	0:ec559500a63f	902	/* If the PCB should be removed, do it. */
andrewbonney	0:ec559500a63f	903	if (pcb_remove) {
andrewbonney	0:ec559500a63f	904	tcp_pcb_purge(pcb);
andrewbonney	0:ec559500a63f	905	/* Remove PCB from tcp_active_pcbs list. */
andrewbonney	0:ec559500a63f	906	if (prev != NULL) {
andrewbonney	0:ec559500a63f	907	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
andrewbonney	0:ec559500a63f	908	prev->next = pcb->next;
andrewbonney	0:ec559500a63f	909	} else {
andrewbonney	0:ec559500a63f	910	/* This PCB was the first. */
andrewbonney	0:ec559500a63f	911	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
andrewbonney	0:ec559500a63f	912	tcp_active_pcbs = pcb->next;
andrewbonney	0:ec559500a63f	913	}
andrewbonney	0:ec559500a63f	914
andrewbonney	0:ec559500a63f	915	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
andrewbonney	0:ec559500a63f	916	if (pcb_reset) {
andrewbonney	0:ec559500a63f	917	tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
andrewbonney	0:ec559500a63f	918	pcb->local_port, pcb->remote_port);
andrewbonney	0:ec559500a63f	919	}
andrewbonney	0:ec559500a63f	920
andrewbonney	0:ec559500a63f	921	pcb2 = pcb->next;
andrewbonney	0:ec559500a63f	922	memp_free(MEMP_TCP_PCB, pcb);
andrewbonney	0:ec559500a63f	923	pcb = pcb2;
andrewbonney	0:ec559500a63f	924	} else {
andrewbonney	0:ec559500a63f	925	/* get the 'next' element now and work with 'prev' below (in case of abort) */
andrewbonney	0:ec559500a63f	926	prev = pcb;
andrewbonney	0:ec559500a63f	927	pcb = pcb->next;
andrewbonney	0:ec559500a63f	928
andrewbonney	0:ec559500a63f	929	/* We check if we should poll the connection. */
andrewbonney	0:ec559500a63f	930	++prev->polltmr;
andrewbonney	0:ec559500a63f	931	if (prev->polltmr >= prev->pollinterval) {
andrewbonney	0:ec559500a63f	932	prev->polltmr = 0;
andrewbonney	0:ec559500a63f	933	LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
andrewbonney	0:ec559500a63f	934	TCP_EVENT_POLL(prev, err);
andrewbonney	0:ec559500a63f	935	/* if err == ERR_ABRT, 'prev' is already deallocated */
andrewbonney	0:ec559500a63f	936	if (err == ERR_OK) {
andrewbonney	0:ec559500a63f	937	tcp_output(prev);
andrewbonney	0:ec559500a63f	938	}
andrewbonney	0:ec559500a63f	939	}
andrewbonney	0:ec559500a63f	940	}
andrewbonney	0:ec559500a63f	941	}
andrewbonney	0:ec559500a63f	942
andrewbonney	0:ec559500a63f	943
andrewbonney	0:ec559500a63f	944	/* Steps through all of the TIME-WAIT PCBs. */
andrewbonney	0:ec559500a63f	945	prev = NULL;
andrewbonney	0:ec559500a63f	946	pcb = tcp_tw_pcbs;
andrewbonney	0:ec559500a63f	947	while (pcb != NULL) {
andrewbonney	0:ec559500a63f	948	LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
andrewbonney	0:ec559500a63f	949	pcb_remove = 0;
andrewbonney	0:ec559500a63f	950
andrewbonney	0:ec559500a63f	951	/* Check if this PCB has stayed long enough in TIME-WAIT */
andrewbonney	0:ec559500a63f	952	if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
andrewbonney	0:ec559500a63f	953	++pcb_remove;
andrewbonney	0:ec559500a63f	954	}
andrewbonney	0:ec559500a63f	955
andrewbonney	0:ec559500a63f	956
andrewbonney	0:ec559500a63f	957
andrewbonney	0:ec559500a63f	958	/* If the PCB should be removed, do it. */
andrewbonney	0:ec559500a63f	959	if (pcb_remove) {
andrewbonney	0:ec559500a63f	960	tcp_pcb_purge(pcb);
andrewbonney	0:ec559500a63f	961	/* Remove PCB from tcp_tw_pcbs list. */
andrewbonney	0:ec559500a63f	962	if (prev != NULL) {
andrewbonney	0:ec559500a63f	963	LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
andrewbonney	0:ec559500a63f	964	prev->next = pcb->next;
andrewbonney	0:ec559500a63f	965	} else {
andrewbonney	0:ec559500a63f	966	/* This PCB was the first. */
andrewbonney	0:ec559500a63f	967	LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
andrewbonney	0:ec559500a63f	968	tcp_tw_pcbs = pcb->next;
andrewbonney	0:ec559500a63f	969	}
andrewbonney	0:ec559500a63f	970	pcb2 = pcb->next;
andrewbonney	0:ec559500a63f	971	memp_free(MEMP_TCP_PCB, pcb);
andrewbonney	0:ec559500a63f	972	pcb = pcb2;
andrewbonney	0:ec559500a63f	973	} else {
andrewbonney	0:ec559500a63f	974	prev = pcb;
andrewbonney	0:ec559500a63f	975	pcb = pcb->next;
andrewbonney	0:ec559500a63f	976	}
andrewbonney	0:ec559500a63f	977	}
andrewbonney	0:ec559500a63f	978	}
andrewbonney	0:ec559500a63f	979
andrewbonney	0:ec559500a63f	980	/**
andrewbonney	0:ec559500a63f	981	* Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
andrewbonney	0:ec559500a63f	982	* "refused" by upper layer (application) and sends delayed ACKs.
andrewbonney	0:ec559500a63f	983	*
andrewbonney	0:ec559500a63f	984	* Automatically called from tcp_tmr().
andrewbonney	0:ec559500a63f	985	*/
andrewbonney	0:ec559500a63f	986	void
andrewbonney	0:ec559500a63f	987	tcp_fasttmr(void)
andrewbonney	0:ec559500a63f	988	{
andrewbonney	0:ec559500a63f	989	struct tcp_pcb *pcb = tcp_active_pcbs;
andrewbonney	0:ec559500a63f	990
andrewbonney	0:ec559500a63f	991	while(pcb != NULL) {
andrewbonney	0:ec559500a63f	992	struct tcp_pcb *next = pcb->next;
andrewbonney	0:ec559500a63f	993	/* If there is data which was previously "refused" by upper layer */
andrewbonney	0:ec559500a63f	994	if (pcb->refused_data != NULL) {
andrewbonney	0:ec559500a63f	995	/* Notify again application with data previously received. */
andrewbonney	0:ec559500a63f	996	err_t err;
andrewbonney	0:ec559500a63f	997	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
andrewbonney	0:ec559500a63f	998	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
andrewbonney	0:ec559500a63f	999	if (err == ERR_OK) {
andrewbonney	0:ec559500a63f	1000	pcb->refused_data = NULL;
andrewbonney	0:ec559500a63f	1001	} else if (err == ERR_ABRT) {
andrewbonney	0:ec559500a63f	1002	/* if err == ERR_ABRT, 'pcb' is already deallocated */
andrewbonney	0:ec559500a63f	1003	pcb = NULL;
andrewbonney	0:ec559500a63f	1004	}
andrewbonney	0:ec559500a63f	1005	}
andrewbonney	0:ec559500a63f	1006
andrewbonney	0:ec559500a63f	1007	/* send delayed ACKs */
andrewbonney	0:ec559500a63f	1008	if (pcb && (pcb->flags & TF_ACK_DELAY)) {
andrewbonney	0:ec559500a63f	1009	LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
andrewbonney	0:ec559500a63f	1010	tcp_ack_now(pcb);
andrewbonney	0:ec559500a63f	1011	tcp_output(pcb);
andrewbonney	0:ec559500a63f	1012	pcb->flags &= ~(TF_ACK_DELAY \| TF_ACK_NOW);
andrewbonney	0:ec559500a63f	1013	}
andrewbonney	0:ec559500a63f	1014
andrewbonney	0:ec559500a63f	1015	pcb = next;
andrewbonney	0:ec559500a63f	1016	}
andrewbonney	0:ec559500a63f	1017	}
andrewbonney	0:ec559500a63f	1018
andrewbonney	0:ec559500a63f	1019	/**
andrewbonney	0:ec559500a63f	1020	* Deallocates a list of TCP segments (tcp_seg structures).
andrewbonney	0:ec559500a63f	1021	*
andrewbonney	0:ec559500a63f	1022	* @param seg tcp_seg list of TCP segments to free
andrewbonney	0:ec559500a63f	1023	*/
andrewbonney	0:ec559500a63f	1024	void
andrewbonney	0:ec559500a63f	1025	tcp_segs_free(struct tcp_seg *seg)
andrewbonney	0:ec559500a63f	1026	{
andrewbonney	0:ec559500a63f	1027	while (seg != NULL) {
andrewbonney	0:ec559500a63f	1028	struct tcp_seg *next = seg->next;
andrewbonney	0:ec559500a63f	1029	tcp_seg_free(seg);
andrewbonney	0:ec559500a63f	1030	seg = next;
andrewbonney	0:ec559500a63f	1031	}
andrewbonney	0:ec559500a63f	1032	}
andrewbonney	0:ec559500a63f	1033
andrewbonney	0:ec559500a63f	1034	/**
andrewbonney	0:ec559500a63f	1035	* Frees a TCP segment (tcp_seg structure).
andrewbonney	0:ec559500a63f	1036	*
andrewbonney	0:ec559500a63f	1037	* @param seg single tcp_seg to free
andrewbonney	0:ec559500a63f	1038	*/
andrewbonney	0:ec559500a63f	1039	void
andrewbonney	0:ec559500a63f	1040	tcp_seg_free(struct tcp_seg *seg)
andrewbonney	0:ec559500a63f	1041	{
andrewbonney	0:ec559500a63f	1042	if (seg != NULL) {
andrewbonney	0:ec559500a63f	1043	if (seg->p != NULL) {
andrewbonney	0:ec559500a63f	1044	pbuf_free(seg->p);
andrewbonney	0:ec559500a63f	1045	#if TCP_DEBUG
andrewbonney	0:ec559500a63f	1046	seg->p = NULL;
andrewbonney	0:ec559500a63f	1047	#endif /* TCP_DEBUG */
andrewbonney	0:ec559500a63f	1048	}
andrewbonney	0:ec559500a63f	1049	memp_free(MEMP_TCP_SEG, seg);
andrewbonney	0:ec559500a63f	1050	}
andrewbonney	0:ec559500a63f	1051	}
andrewbonney	0:ec559500a63f	1052
andrewbonney	0:ec559500a63f	1053	/**
andrewbonney	0:ec559500a63f	1054	* Sets the priority of a connection.
andrewbonney	0:ec559500a63f	1055	*
andrewbonney	0:ec559500a63f	1056	* @param pcb the tcp_pcb to manipulate
andrewbonney	0:ec559500a63f	1057	* @param prio new priority
andrewbonney	0:ec559500a63f	1058	*/
andrewbonney	0:ec559500a63f	1059	void
andrewbonney	0:ec559500a63f	1060	tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
andrewbonney	0:ec559500a63f	1061	{
andrewbonney	0:ec559500a63f	1062	pcb->prio = prio;
andrewbonney	0:ec559500a63f	1063	}
andrewbonney	0:ec559500a63f	1064
andrewbonney	0:ec559500a63f	1065	#if TCP_QUEUE_OOSEQ
andrewbonney	0:ec559500a63f	1066	/**
andrewbonney	0:ec559500a63f	1067	* Returns a copy of the given TCP segment.
andrewbonney	0:ec559500a63f	1068	* The pbuf and data are not copied, only the pointers
andrewbonney	0:ec559500a63f	1069	*
andrewbonney	0:ec559500a63f	1070	* @param seg the old tcp_seg
andrewbonney	0:ec559500a63f	1071	* @return a copy of seg
andrewbonney	0:ec559500a63f	1072	*/
andrewbonney	0:ec559500a63f	1073	struct tcp_seg *
andrewbonney	0:ec559500a63f	1074	tcp_seg_copy(struct tcp_seg *seg)
andrewbonney	0:ec559500a63f	1075	{
andrewbonney	0:ec559500a63f	1076	struct tcp_seg *cseg;
andrewbonney	0:ec559500a63f	1077
andrewbonney	0:ec559500a63f	1078	cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
andrewbonney	0:ec559500a63f	1079	if (cseg == NULL) {
andrewbonney	0:ec559500a63f	1080	return NULL;
andrewbonney	0:ec559500a63f	1081	}
andrewbonney	0:ec559500a63f	1082	SMEMCPY((u8_t )cseg, (const u8_t )seg, sizeof(struct tcp_seg));
andrewbonney	0:ec559500a63f	1083	pbuf_ref(cseg->p);
andrewbonney	0:ec559500a63f	1084	return cseg;
andrewbonney	0:ec559500a63f	1085	}
andrewbonney	0:ec559500a63f	1086	#endif /* TCP_QUEUE_OOSEQ */
andrewbonney	0:ec559500a63f	1087
andrewbonney	0:ec559500a63f	1088	#if LWIP_CALLBACK_API
andrewbonney	0:ec559500a63f	1089	/**
andrewbonney	0:ec559500a63f	1090	* Default receive callback that is called if the user didn't register
andrewbonney	0:ec559500a63f	1091	* a recv callback for the pcb.
andrewbonney	0:ec559500a63f	1092	*/
andrewbonney	0:ec559500a63f	1093	err_t
andrewbonney	0:ec559500a63f	1094	tcp_recv_null(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
andrewbonney	0:ec559500a63f	1095	{
andrewbonney	0:ec559500a63f	1096	LWIP_UNUSED_ARG(arg);
andrewbonney	0:ec559500a63f	1097	if (p != NULL) {
andrewbonney	0:ec559500a63f	1098	tcp_recved(pcb, p->tot_len);
andrewbonney	0:ec559500a63f	1099	pbuf_free(p);
andrewbonney	0:ec559500a63f	1100	} else if (err == ERR_OK) {
andrewbonney	0:ec559500a63f	1101	return tcp_close(pcb);
andrewbonney	0:ec559500a63f	1102	}
andrewbonney	0:ec559500a63f	1103	return ERR_OK;
andrewbonney	0:ec559500a63f	1104	}
andrewbonney	0:ec559500a63f	1105	#endif /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	1106
andrewbonney	0:ec559500a63f	1107	/**
andrewbonney	0:ec559500a63f	1108	* Kills the oldest active connection that has lower priority than prio.
andrewbonney	0:ec559500a63f	1109	*
andrewbonney	0:ec559500a63f	1110	* @param prio minimum priority
andrewbonney	0:ec559500a63f	1111	*/
andrewbonney	0:ec559500a63f	1112	static void
andrewbonney	0:ec559500a63f	1113	tcp_kill_prio(u8_t prio)
andrewbonney	0:ec559500a63f	1114	{
andrewbonney	0:ec559500a63f	1115	struct tcp_pcb pcb, inactive;
andrewbonney	0:ec559500a63f	1116	u32_t inactivity;
andrewbonney	0:ec559500a63f	1117	u8_t mprio;
andrewbonney	0:ec559500a63f	1118
andrewbonney	0:ec559500a63f	1119
andrewbonney	0:ec559500a63f	1120	mprio = TCP_PRIO_MAX;
andrewbonney	0:ec559500a63f	1121
andrewbonney	0:ec559500a63f	1122	/* We kill the oldest active connection that has lower priority than prio. */
andrewbonney	0:ec559500a63f	1123	inactivity = 0;
andrewbonney	0:ec559500a63f	1124	inactive = NULL;
andrewbonney	0:ec559500a63f	1125	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
andrewbonney	0:ec559500a63f	1126	if (pcb->prio <= prio &&
andrewbonney	0:ec559500a63f	1127	pcb->prio <= mprio &&
andrewbonney	0:ec559500a63f	1128	(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
andrewbonney	0:ec559500a63f	1129	inactivity = tcp_ticks - pcb->tmr;
andrewbonney	0:ec559500a63f	1130	inactive = pcb;
andrewbonney	0:ec559500a63f	1131	mprio = pcb->prio;
andrewbonney	0:ec559500a63f	1132	}
andrewbonney	0:ec559500a63f	1133	}
andrewbonney	0:ec559500a63f	1134	if (inactive != NULL) {
andrewbonney	0:ec559500a63f	1135	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
andrewbonney	0:ec559500a63f	1136	(void *)inactive, inactivity));
andrewbonney	0:ec559500a63f	1137	tcp_abort(inactive);
andrewbonney	0:ec559500a63f	1138	}
andrewbonney	0:ec559500a63f	1139	}
andrewbonney	0:ec559500a63f	1140
andrewbonney	0:ec559500a63f	1141	/**
andrewbonney	0:ec559500a63f	1142	* Kills the oldest connection that is in TIME_WAIT state.
andrewbonney	0:ec559500a63f	1143	* Called from tcp_alloc() if no more connections are available.
andrewbonney	0:ec559500a63f	1144	*/
andrewbonney	0:ec559500a63f	1145	static void
andrewbonney	0:ec559500a63f	1146	tcp_kill_timewait(void)
andrewbonney	0:ec559500a63f	1147	{
andrewbonney	0:ec559500a63f	1148	struct tcp_pcb pcb, inactive;
andrewbonney	0:ec559500a63f	1149	u32_t inactivity;
andrewbonney	0:ec559500a63f	1150
andrewbonney	0:ec559500a63f	1151	inactivity = 0;
andrewbonney	0:ec559500a63f	1152	inactive = NULL;
andrewbonney	0:ec559500a63f	1153	/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
andrewbonney	0:ec559500a63f	1154	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
andrewbonney	0:ec559500a63f	1155	if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
andrewbonney	0:ec559500a63f	1156	inactivity = tcp_ticks - pcb->tmr;
andrewbonney	0:ec559500a63f	1157	inactive = pcb;
andrewbonney	0:ec559500a63f	1158	}
andrewbonney	0:ec559500a63f	1159	}
andrewbonney	0:ec559500a63f	1160	if (inactive != NULL) {
andrewbonney	0:ec559500a63f	1161	LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
andrewbonney	0:ec559500a63f	1162	(void *)inactive, inactivity));
andrewbonney	0:ec559500a63f	1163	tcp_abort(inactive);
andrewbonney	0:ec559500a63f	1164	}
andrewbonney	0:ec559500a63f	1165	}
andrewbonney	0:ec559500a63f	1166
andrewbonney	0:ec559500a63f	1167	/**
andrewbonney	0:ec559500a63f	1168	* Allocate a new tcp_pcb structure.
andrewbonney	0:ec559500a63f	1169	*
andrewbonney	0:ec559500a63f	1170	* @param prio priority for the new pcb
andrewbonney	0:ec559500a63f	1171	* @return a new tcp_pcb that initially is in state CLOSED
andrewbonney	0:ec559500a63f	1172	*/
andrewbonney	0:ec559500a63f	1173	struct tcp_pcb *
andrewbonney	0:ec559500a63f	1174	tcp_alloc(u8_t prio)
andrewbonney	0:ec559500a63f	1175	{
andrewbonney	0:ec559500a63f	1176	struct tcp_pcb *pcb;
andrewbonney	0:ec559500a63f	1177	u32_t iss;
andrewbonney	0:ec559500a63f	1178
andrewbonney	0:ec559500a63f	1179	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
andrewbonney	0:ec559500a63f	1180	if (pcb == NULL) {
andrewbonney	0:ec559500a63f	1181	/* Try killing oldest connection in TIME-WAIT. */
andrewbonney	0:ec559500a63f	1182	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
andrewbonney	0:ec559500a63f	1183	tcp_kill_timewait();
andrewbonney	0:ec559500a63f	1184	/* Try to allocate a tcp_pcb again. */
andrewbonney	0:ec559500a63f	1185	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
andrewbonney	0:ec559500a63f	1186	if (pcb == NULL) {
andrewbonney	0:ec559500a63f	1187	/* Try killing active connections with lower priority than the new one. */
andrewbonney	0:ec559500a63f	1188	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
andrewbonney	0:ec559500a63f	1189	tcp_kill_prio(prio);
andrewbonney	0:ec559500a63f	1190	/* Try to allocate a tcp_pcb again. */
andrewbonney	0:ec559500a63f	1191	pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
andrewbonney	0:ec559500a63f	1192	if (pcb != NULL) {
andrewbonney	0:ec559500a63f	1193	/* adjust err stats: memp_malloc failed twice before */
andrewbonney	0:ec559500a63f	1194	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
andrewbonney	0:ec559500a63f	1195	}
andrewbonney	0:ec559500a63f	1196	}
andrewbonney	0:ec559500a63f	1197	if (pcb != NULL) {
andrewbonney	0:ec559500a63f	1198	/* adjust err stats: timewait PCB was freed above */
andrewbonney	0:ec559500a63f	1199	MEMP_STATS_DEC(err, MEMP_TCP_PCB);
andrewbonney	0:ec559500a63f	1200	}
andrewbonney	0:ec559500a63f	1201	}
andrewbonney	0:ec559500a63f	1202	if (pcb != NULL) {
andrewbonney	0:ec559500a63f	1203	memset(pcb, 0, sizeof(struct tcp_pcb));
andrewbonney	0:ec559500a63f	1204	pcb->prio = prio;
andrewbonney	0:ec559500a63f	1205	pcb->snd_buf = TCP_SND_BUF;
andrewbonney	0:ec559500a63f	1206	pcb->snd_queuelen = 0;
andrewbonney	0:ec559500a63f	1207	pcb->rcv_wnd = TCP_WND;
andrewbonney	0:ec559500a63f	1208	pcb->rcv_ann_wnd = TCP_WND;
andrewbonney	0:ec559500a63f	1209	pcb->tos = 0;
andrewbonney	0:ec559500a63f	1210	pcb->ttl = TCP_TTL;
andrewbonney	0:ec559500a63f	1211	/* As initial send MSS, we use TCP_MSS but limit it to 536.
andrewbonney	0:ec559500a63f	1212	The send MSS is updated when an MSS option is received. */
andrewbonney	0:ec559500a63f	1213	pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
andrewbonney	0:ec559500a63f	1214	pcb->rto = 3000 / TCP_SLOW_INTERVAL;
andrewbonney	0:ec559500a63f	1215	pcb->sa = 0;
andrewbonney	0:ec559500a63f	1216	pcb->sv = 3000 / TCP_SLOW_INTERVAL;
andrewbonney	0:ec559500a63f	1217	pcb->rtime = -1;
andrewbonney	0:ec559500a63f	1218	pcb->cwnd = 1;
andrewbonney	0:ec559500a63f	1219	iss = tcp_next_iss();
andrewbonney	0:ec559500a63f	1220	pcb->snd_wl2 = iss;
andrewbonney	0:ec559500a63f	1221	pcb->snd_nxt = iss;
andrewbonney	0:ec559500a63f	1222	pcb->lastack = iss;
andrewbonney	0:ec559500a63f	1223	pcb->snd_lbb = iss;
andrewbonney	0:ec559500a63f	1224	pcb->tmr = tcp_ticks;
andrewbonney	0:ec559500a63f	1225
andrewbonney	0:ec559500a63f	1226	LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
andrewbonney	0:ec559500a63f	1227
andrewbonney	0:ec559500a63f	1228	pcb->polltmr = 0;
andrewbonney	0:ec559500a63f	1229
andrewbonney	0:ec559500a63f	1230	#if LWIP_CALLBACK_API
andrewbonney	0:ec559500a63f	1231	pcb->recv = tcp_recv_null;
andrewbonney	0:ec559500a63f	1232	#endif /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	1233
andrewbonney	0:ec559500a63f	1234	/* Init KEEPALIVE timer */
andrewbonney	0:ec559500a63f	1235	pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
andrewbonney	0:ec559500a63f	1236
andrewbonney	0:ec559500a63f	1237	#if LWIP_TCP_KEEPALIVE
andrewbonney	0:ec559500a63f	1238	pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
andrewbonney	0:ec559500a63f	1239	pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
andrewbonney	0:ec559500a63f	1240	#endif /* LWIP_TCP_KEEPALIVE */
andrewbonney	0:ec559500a63f	1241
andrewbonney	0:ec559500a63f	1242	pcb->keep_cnt_sent = 0;
andrewbonney	0:ec559500a63f	1243	}
andrewbonney	0:ec559500a63f	1244	return pcb;
andrewbonney	0:ec559500a63f	1245	}
andrewbonney	0:ec559500a63f	1246
andrewbonney	0:ec559500a63f	1247	/**
andrewbonney	0:ec559500a63f	1248	* Creates a new TCP protocol control block but doesn't place it on
andrewbonney	0:ec559500a63f	1249	* any of the TCP PCB lists.
andrewbonney	0:ec559500a63f	1250	* The pcb is not put on any list until binding using tcp_bind().
andrewbonney	0:ec559500a63f	1251	*
andrewbonney	0:ec559500a63f	1252	* @internal: Maybe there should be a idle TCP PCB list where these
andrewbonney	0:ec559500a63f	1253	* PCBs are put on. Port reservation using tcp_bind() is implemented but
andrewbonney	0:ec559500a63f	1254	* allocated pcbs that are not bound can't be killed automatically if wanting
andrewbonney	0:ec559500a63f	1255	* to allocate a pcb with higher prio (@see tcp_kill_prio())
andrewbonney	0:ec559500a63f	1256	*
andrewbonney	0:ec559500a63f	1257	* @return a new tcp_pcb that initially is in state CLOSED
andrewbonney	0:ec559500a63f	1258	*/
andrewbonney	0:ec559500a63f	1259	struct tcp_pcb *
andrewbonney	0:ec559500a63f	1260	tcp_new(void)
andrewbonney	0:ec559500a63f	1261	{
andrewbonney	0:ec559500a63f	1262	return tcp_alloc(TCP_PRIO_NORMAL);
andrewbonney	0:ec559500a63f	1263	}
andrewbonney	0:ec559500a63f	1264
andrewbonney	0:ec559500a63f	1265	/**
andrewbonney	0:ec559500a63f	1266	* Used to specify the argument that should be passed callback
andrewbonney	0:ec559500a63f	1267	* functions.
andrewbonney	0:ec559500a63f	1268	*
andrewbonney	0:ec559500a63f	1269	* @param pcb tcp_pcb to set the callback argument
andrewbonney	0:ec559500a63f	1270	* @param arg void pointer argument to pass to callback functions
andrewbonney	0:ec559500a63f	1271	*/
andrewbonney	0:ec559500a63f	1272	void
andrewbonney	0:ec559500a63f	1273	tcp_arg(struct tcp_pcb pcb, void arg)
andrewbonney	0:ec559500a63f	1274	{
andrewbonney	0:ec559500a63f	1275	pcb->callback_arg = arg;
andrewbonney	0:ec559500a63f	1276	}
andrewbonney	0:ec559500a63f	1277	#if LWIP_CALLBACK_API
andrewbonney	0:ec559500a63f	1278
andrewbonney	0:ec559500a63f	1279	/**
andrewbonney	0:ec559500a63f	1280	* Used to specify the function that should be called when a TCP
andrewbonney	0:ec559500a63f	1281	* connection receives data.
andrewbonney	0:ec559500a63f	1282	*
andrewbonney	0:ec559500a63f	1283	* @param pcb tcp_pcb to set the recv callback
andrewbonney	0:ec559500a63f	1284	* @param recv callback function to call for this pcb when data is received
andrewbonney	0:ec559500a63f	1285	*/
andrewbonney	0:ec559500a63f	1286	void
andrewbonney	0:ec559500a63f	1287	tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
andrewbonney	0:ec559500a63f	1288	{
andrewbonney	0:ec559500a63f	1289	pcb->recv = recv;
andrewbonney	0:ec559500a63f	1290	}
andrewbonney	0:ec559500a63f	1291
andrewbonney	0:ec559500a63f	1292	/**
andrewbonney	0:ec559500a63f	1293	* Used to specify the function that should be called when TCP data
andrewbonney	0:ec559500a63f	1294	* has been successfully delivered to the remote host.
andrewbonney	0:ec559500a63f	1295	*
andrewbonney	0:ec559500a63f	1296	* @param pcb tcp_pcb to set the sent callback
andrewbonney	0:ec559500a63f	1297	* @param sent callback function to call for this pcb when data is successfully sent
andrewbonney	0:ec559500a63f	1298	*/
andrewbonney	0:ec559500a63f	1299	void
andrewbonney	0:ec559500a63f	1300	tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
andrewbonney	0:ec559500a63f	1301	{
andrewbonney	0:ec559500a63f	1302	pcb->sent = sent;
andrewbonney	0:ec559500a63f	1303	}
andrewbonney	0:ec559500a63f	1304
andrewbonney	0:ec559500a63f	1305	/**
andrewbonney	0:ec559500a63f	1306	* Used to specify the function that should be called when a fatal error
andrewbonney	0:ec559500a63f	1307	* has occured on the connection.
andrewbonney	0:ec559500a63f	1308	*
andrewbonney	0:ec559500a63f	1309	* @param pcb tcp_pcb to set the err callback
andrewbonney	0:ec559500a63f	1310	* @param err callback function to call for this pcb when a fatal error
andrewbonney	0:ec559500a63f	1311	* has occured on the connection
andrewbonney	0:ec559500a63f	1312	*/
andrewbonney	0:ec559500a63f	1313	void
andrewbonney	0:ec559500a63f	1314	tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
andrewbonney	0:ec559500a63f	1315	{
andrewbonney	0:ec559500a63f	1316	pcb->errf = err;
andrewbonney	0:ec559500a63f	1317	}
andrewbonney	0:ec559500a63f	1318
andrewbonney	0:ec559500a63f	1319	/**
andrewbonney	0:ec559500a63f	1320	* Used for specifying the function that should be called when a
andrewbonney	0:ec559500a63f	1321	* LISTENing connection has been connected to another host.
andrewbonney	0:ec559500a63f	1322	*
andrewbonney	0:ec559500a63f	1323	* @param pcb tcp_pcb to set the accept callback
andrewbonney	0:ec559500a63f	1324	* @param accept callback function to call for this pcb when LISTENing
andrewbonney	0:ec559500a63f	1325	* connection has been connected to another host
andrewbonney	0:ec559500a63f	1326	*/
andrewbonney	0:ec559500a63f	1327	void
andrewbonney	0:ec559500a63f	1328	tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
andrewbonney	0:ec559500a63f	1329	{
andrewbonney	0:ec559500a63f	1330	pcb->accept = accept;
andrewbonney	0:ec559500a63f	1331	}
andrewbonney	0:ec559500a63f	1332	#endif /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	1333
andrewbonney	0:ec559500a63f	1334
andrewbonney	0:ec559500a63f	1335	/**
andrewbonney	0:ec559500a63f	1336	* Used to specify the function that should be called periodically
andrewbonney	0:ec559500a63f	1337	* from TCP. The interval is specified in terms of the TCP coarse
andrewbonney	0:ec559500a63f	1338	* timer interval, which is called twice a second.
andrewbonney	0:ec559500a63f	1339	*
andrewbonney	0:ec559500a63f	1340	*/
andrewbonney	0:ec559500a63f	1341	void
andrewbonney	0:ec559500a63f	1342	tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
andrewbonney	0:ec559500a63f	1343	{
andrewbonney	0:ec559500a63f	1344	#if LWIP_CALLBACK_API
andrewbonney	0:ec559500a63f	1345	pcb->poll = poll;
andrewbonney	0:ec559500a63f	1346	#else /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	1347	LWIP_UNUSED_ARG(poll);
andrewbonney	0:ec559500a63f	1348	#endif /* LWIP_CALLBACK_API */
andrewbonney	0:ec559500a63f	1349	pcb->pollinterval = interval;
andrewbonney	0:ec559500a63f	1350	}
andrewbonney	0:ec559500a63f	1351
andrewbonney	0:ec559500a63f	1352	/**
andrewbonney	0:ec559500a63f	1353	* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
andrewbonney	0:ec559500a63f	1354	* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
andrewbonney	0:ec559500a63f	1355	*
andrewbonney	0:ec559500a63f	1356	* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
andrewbonney	0:ec559500a63f	1357	*/
andrewbonney	0:ec559500a63f	1358	void
andrewbonney	0:ec559500a63f	1359	tcp_pcb_purge(struct tcp_pcb *pcb)
andrewbonney	0:ec559500a63f	1360	{
andrewbonney	0:ec559500a63f	1361	if (pcb->state != CLOSED &&
andrewbonney	0:ec559500a63f	1362	pcb->state != TIME_WAIT &&
andrewbonney	0:ec559500a63f	1363	pcb->state != LISTEN) {
andrewbonney	0:ec559500a63f	1364
andrewbonney	0:ec559500a63f	1365	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
andrewbonney	0:ec559500a63f	1366
andrewbonney	0:ec559500a63f	1367	#if TCP_LISTEN_BACKLOG
andrewbonney	0:ec559500a63f	1368	if (pcb->state == SYN_RCVD) {
andrewbonney	0:ec559500a63f	1369	/* Need to find the corresponding listen_pcb and decrease its accepts_pending */
andrewbonney	0:ec559500a63f	1370	struct tcp_pcb_listen *lpcb;
andrewbonney	0:ec559500a63f	1371	LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
andrewbonney	0:ec559500a63f	1372	tcp_listen_pcbs.listen_pcbs != NULL);
andrewbonney	0:ec559500a63f	1373	for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
andrewbonney	0:ec559500a63f	1374	if ((lpcb->local_port == pcb->local_port) &&
andrewbonney	0:ec559500a63f	1375	(ip_addr_isany(&lpcb->local_ip) \|\|
andrewbonney	0:ec559500a63f	1376	ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
andrewbonney	0:ec559500a63f	1377	/* port and address of the listen pcb match the timed-out pcb */
andrewbonney	0:ec559500a63f	1378	LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
andrewbonney	0:ec559500a63f	1379	lpcb->accepts_pending > 0);
andrewbonney	0:ec559500a63f	1380	lpcb->accepts_pending--;
andrewbonney	0:ec559500a63f	1381	break;
andrewbonney	0:ec559500a63f	1382	}
andrewbonney	0:ec559500a63f	1383	}
andrewbonney	0:ec559500a63f	1384	}
andrewbonney	0:ec559500a63f	1385	#endif /* TCP_LISTEN_BACKLOG */
andrewbonney	0:ec559500a63f	1386
andrewbonney	0:ec559500a63f	1387
andrewbonney	0:ec559500a63f	1388	if (pcb->refused_data != NULL) {
andrewbonney	0:ec559500a63f	1389	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
andrewbonney	0:ec559500a63f	1390	pbuf_free(pcb->refused_data);
andrewbonney	0:ec559500a63f	1391	pcb->refused_data = NULL;
andrewbonney	0:ec559500a63f	1392	}
andrewbonney	0:ec559500a63f	1393	if (pcb->unsent != NULL) {
andrewbonney	0:ec559500a63f	1394	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
andrewbonney	0:ec559500a63f	1395	}
andrewbonney	0:ec559500a63f	1396	if (pcb->unacked != NULL) {
andrewbonney	0:ec559500a63f	1397	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
andrewbonney	0:ec559500a63f	1398	}
andrewbonney	0:ec559500a63f	1399	#if TCP_QUEUE_OOSEQ
andrewbonney	0:ec559500a63f	1400	if (pcb->ooseq != NULL) {
andrewbonney	0:ec559500a63f	1401	LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
andrewbonney	0:ec559500a63f	1402	}
andrewbonney	0:ec559500a63f	1403	tcp_segs_free(pcb->ooseq);
andrewbonney	0:ec559500a63f	1404	pcb->ooseq = NULL;
andrewbonney	0:ec559500a63f	1405	#endif /* TCP_QUEUE_OOSEQ */
andrewbonney	0:ec559500a63f	1406
andrewbonney	0:ec559500a63f	1407	/* Stop the retransmission timer as it will expect data on unacked
andrewbonney	0:ec559500a63f	1408	queue if it fires */
andrewbonney	0:ec559500a63f	1409	pcb->rtime = -1;
andrewbonney	0:ec559500a63f	1410
andrewbonney	0:ec559500a63f	1411	tcp_segs_free(pcb->unsent);
andrewbonney	0:ec559500a63f	1412	tcp_segs_free(pcb->unacked);
andrewbonney	0:ec559500a63f	1413	pcb->unacked = pcb->unsent = NULL;
andrewbonney	0:ec559500a63f	1414	#if TCP_OVERSIZE
andrewbonney	0:ec559500a63f	1415	pcb->unsent_oversize = 0;
andrewbonney	0:ec559500a63f	1416	#endif /* TCP_OVERSIZE */
andrewbonney	0:ec559500a63f	1417	}
andrewbonney	0:ec559500a63f	1418	}
andrewbonney	0:ec559500a63f	1419
andrewbonney	0:ec559500a63f	1420	/**
andrewbonney	0:ec559500a63f	1421	* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
andrewbonney	0:ec559500a63f	1422	*
andrewbonney	0:ec559500a63f	1423	* @param pcblist PCB list to purge.
andrewbonney	0:ec559500a63f	1424	* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
andrewbonney	0:ec559500a63f	1425	*/
andrewbonney	0:ec559500a63f	1426	void
andrewbonney	0:ec559500a63f	1427	tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb)
andrewbonney	0:ec559500a63f	1428	{
andrewbonney	0:ec559500a63f	1429	TCP_RMV(pcblist, pcb);
andrewbonney	0:ec559500a63f	1430
andrewbonney	0:ec559500a63f	1431	tcp_pcb_purge(pcb);
andrewbonney	0:ec559500a63f	1432
andrewbonney	0:ec559500a63f	1433	/* if there is an outstanding delayed ACKs, send it */
andrewbonney	0:ec559500a63f	1434	if (pcb->state != TIME_WAIT &&
andrewbonney	0:ec559500a63f	1435	pcb->state != LISTEN &&
andrewbonney	0:ec559500a63f	1436	pcb->flags & TF_ACK_DELAY) {
andrewbonney	0:ec559500a63f	1437	pcb->flags \|= TF_ACK_NOW;
andrewbonney	0:ec559500a63f	1438	tcp_output(pcb);
andrewbonney	0:ec559500a63f	1439	}
andrewbonney	0:ec559500a63f	1440
andrewbonney	0:ec559500a63f	1441	if (pcb->state != LISTEN) {
andrewbonney	0:ec559500a63f	1442	LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
andrewbonney	0:ec559500a63f	1443	LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
andrewbonney	0:ec559500a63f	1444	#if TCP_QUEUE_OOSEQ
andrewbonney	0:ec559500a63f	1445	LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
andrewbonney	0:ec559500a63f	1446	#endif /* TCP_QUEUE_OOSEQ */
andrewbonney	0:ec559500a63f	1447	}
andrewbonney	0:ec559500a63f	1448
andrewbonney	0:ec559500a63f	1449	pcb->state = CLOSED;
andrewbonney	0:ec559500a63f	1450
andrewbonney	0:ec559500a63f	1451	LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
andrewbonney	0:ec559500a63f	1452	}
andrewbonney	0:ec559500a63f	1453
andrewbonney	0:ec559500a63f	1454	/**
andrewbonney	0:ec559500a63f	1455	* Calculates a new initial sequence number for new connections.
andrewbonney	0:ec559500a63f	1456	*
andrewbonney	0:ec559500a63f	1457	* @return u32_t pseudo random sequence number
andrewbonney	0:ec559500a63f	1458	*/
andrewbonney	0:ec559500a63f	1459	u32_t
andrewbonney	0:ec559500a63f	1460	tcp_next_iss(void)
andrewbonney	0:ec559500a63f	1461	{
andrewbonney	0:ec559500a63f	1462	static u32_t iss = 6510;
andrewbonney	0:ec559500a63f	1463
andrewbonney	0:ec559500a63f	1464	iss += tcp_ticks; /* XXX */
andrewbonney	0:ec559500a63f	1465	return iss;
andrewbonney	0:ec559500a63f	1466	}
andrewbonney	0:ec559500a63f	1467
andrewbonney	0:ec559500a63f	1468	#if TCP_CALCULATE_EFF_SEND_MSS
andrewbonney	0:ec559500a63f	1469	/**
andrewbonney	0:ec559500a63f	1470	* Calcluates the effective send mss that can be used for a specific IP address
andrewbonney	0:ec559500a63f	1471	* by using ip_route to determin the netif used to send to the address and
andrewbonney	0:ec559500a63f	1472	* calculating the minimum of TCP_MSS and that netif's mtu (if set).
andrewbonney	0:ec559500a63f	1473	*/
andrewbonney	0:ec559500a63f	1474	u16_t
andrewbonney	0:ec559500a63f	1475	tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
andrewbonney	0:ec559500a63f	1476	{
andrewbonney	0:ec559500a63f	1477	u16_t mss_s;
andrewbonney	0:ec559500a63f	1478	struct netif *outif;
andrewbonney	0:ec559500a63f	1479
andrewbonney	0:ec559500a63f	1480	outif = ip_route(addr);
andrewbonney	0:ec559500a63f	1481	if ((outif != NULL) && (outif->mtu != 0)) {
andrewbonney	0:ec559500a63f	1482	mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
andrewbonney	0:ec559500a63f	1483	/* RFC 1122, chap 4.2.2.6:
andrewbonney	0:ec559500a63f	1484	* Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
andrewbonney	0:ec559500a63f	1485	* We correct for TCP options in tcp_write(), and don't support IP options.
andrewbonney	0:ec559500a63f	1486	*/
andrewbonney	0:ec559500a63f	1487	sendmss = LWIP_MIN(sendmss, mss_s);
andrewbonney	0:ec559500a63f	1488	}
andrewbonney	0:ec559500a63f	1489	return sendmss;
andrewbonney	0:ec559500a63f	1490	}
andrewbonney	0:ec559500a63f	1491	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
andrewbonney	0:ec559500a63f	1492
andrewbonney	0:ec559500a63f	1493	const char*
andrewbonney	0:ec559500a63f	1494	tcp_debug_state_str(enum tcp_state s)
andrewbonney	0:ec559500a63f	1495	{
andrewbonney	0:ec559500a63f	1496	return tcp_state_str[s];
andrewbonney	0:ec559500a63f	1497	}
andrewbonney	0:ec559500a63f	1498
andrewbonney	0:ec559500a63f	1499	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
andrewbonney	0:ec559500a63f	1500	/**
andrewbonney	0:ec559500a63f	1501	* Print a tcp header for debugging purposes.
andrewbonney	0:ec559500a63f	1502	*
andrewbonney	0:ec559500a63f	1503	* @param tcphdr pointer to a struct tcp_hdr
andrewbonney	0:ec559500a63f	1504	*/
andrewbonney	0:ec559500a63f	1505	void
andrewbonney	0:ec559500a63f	1506	tcp_debug_print(struct tcp_hdr *tcphdr)
andrewbonney	0:ec559500a63f	1507	{
andrewbonney	0:ec559500a63f	1508	LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
andrewbonney	0:ec559500a63f	1509	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:ec559500a63f	1510	LWIP_DEBUGF(TCP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
andrewbonney	0:ec559500a63f	1511	ntohs(tcphdr->src), ntohs(tcphdr->dest)));
andrewbonney	0:ec559500a63f	1512	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:ec559500a63f	1513	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (seq no)\n",
andrewbonney	0:ec559500a63f	1514	ntohl(tcphdr->seqno)));
andrewbonney	0:ec559500a63f	1515	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:ec559500a63f	1516	LWIP_DEBUGF(TCP_DEBUG, ("\| %010"U32_F" \| (ack no)\n",
andrewbonney	0:ec559500a63f	1517	ntohl(tcphdr->ackno)));
andrewbonney	0:ec559500a63f	1518	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:ec559500a63f	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 (",
andrewbonney	0:ec559500a63f	1520	TCPH_HDRLEN(tcphdr),
andrewbonney	0:ec559500a63f	1521	TCPH_FLAGS(tcphdr) >> 5 & 1,
andrewbonney	0:ec559500a63f	1522	TCPH_FLAGS(tcphdr) >> 4 & 1,
andrewbonney	0:ec559500a63f	1523	TCPH_FLAGS(tcphdr) >> 3 & 1,
andrewbonney	0:ec559500a63f	1524	TCPH_FLAGS(tcphdr) >> 2 & 1,
andrewbonney	0:ec559500a63f	1525	TCPH_FLAGS(tcphdr) >> 1 & 1,
andrewbonney	0:ec559500a63f	1526	TCPH_FLAGS(tcphdr) & 1,
andrewbonney	0:ec559500a63f	1527	ntohs(tcphdr->wnd)));
andrewbonney	0:ec559500a63f	1528	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
andrewbonney	0:ec559500a63f	1529	LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
andrewbonney	0:ec559500a63f	1530	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:ec559500a63f	1531	LWIP_DEBUGF(TCP_DEBUG, ("\| 0x%04"X16_F" \| %5"U16_F" \| (chksum, urgp)\n",
andrewbonney	0:ec559500a63f	1532	ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
andrewbonney	0:ec559500a63f	1533	LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:ec559500a63f	1534	}
andrewbonney	0:ec559500a63f	1535
andrewbonney	0:ec559500a63f	1536	/**
andrewbonney	0:ec559500a63f	1537	* Print a tcp state for debugging purposes.
andrewbonney	0:ec559500a63f	1538	*
andrewbonney	0:ec559500a63f	1539	* @param s enum tcp_state to print
andrewbonney	0:ec559500a63f	1540	*/
andrewbonney	0:ec559500a63f	1541	void
andrewbonney	0:ec559500a63f	1542	tcp_debug_print_state(enum tcp_state s)
andrewbonney	0:ec559500a63f	1543	{
andrewbonney	0:ec559500a63f	1544	LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
andrewbonney	0:ec559500a63f	1545	}
andrewbonney	0:ec559500a63f	1546
andrewbonney	0:ec559500a63f	1547	/**
andrewbonney	0:ec559500a63f	1548	* Print tcp flags for debugging purposes.
andrewbonney	0:ec559500a63f	1549	*
andrewbonney	0:ec559500a63f	1550	* @param flags tcp flags, all active flags are printed
andrewbonney	0:ec559500a63f	1551	*/
andrewbonney	0:ec559500a63f	1552	void
andrewbonney	0:ec559500a63f	1553	tcp_debug_print_flags(u8_t flags)
andrewbonney	0:ec559500a63f	1554	{
andrewbonney	0:ec559500a63f	1555	if (flags & TCP_FIN) {
andrewbonney	0:ec559500a63f	1556	LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
andrewbonney	0:ec559500a63f	1557	}
andrewbonney	0:ec559500a63f	1558	if (flags & TCP_SYN) {
andrewbonney	0:ec559500a63f	1559	LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
andrewbonney	0:ec559500a63f	1560	}
andrewbonney	0:ec559500a63f	1561	if (flags & TCP_RST) {
andrewbonney	0:ec559500a63f	1562	LWIP_DEBUGF(TCP_DEBUG, ("RST "));
andrewbonney	0:ec559500a63f	1563	}
andrewbonney	0:ec559500a63f	1564	if (flags & TCP_PSH) {
andrewbonney	0:ec559500a63f	1565	LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
andrewbonney	0:ec559500a63f	1566	}
andrewbonney	0:ec559500a63f	1567	if (flags & TCP_ACK) {
andrewbonney	0:ec559500a63f	1568	LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
andrewbonney	0:ec559500a63f	1569	}
andrewbonney	0:ec559500a63f	1570	if (flags & TCP_URG) {
andrewbonney	0:ec559500a63f	1571	LWIP_DEBUGF(TCP_DEBUG, ("URG "));
andrewbonney	0:ec559500a63f	1572	}
andrewbonney	0:ec559500a63f	1573	if (flags & TCP_ECE) {
andrewbonney	0:ec559500a63f	1574	LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
andrewbonney	0:ec559500a63f	1575	}
andrewbonney	0:ec559500a63f	1576	if (flags & TCP_CWR) {
andrewbonney	0:ec559500a63f	1577	LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
andrewbonney	0:ec559500a63f	1578	}
andrewbonney	0:ec559500a63f	1579	LWIP_DEBUGF(TCP_DEBUG, ("\n"));
andrewbonney	0:ec559500a63f	1580	}
andrewbonney	0:ec559500a63f	1581
andrewbonney	0:ec559500a63f	1582	/**
andrewbonney	0:ec559500a63f	1583	* Print all tcp_pcbs in every list for debugging purposes.
andrewbonney	0:ec559500a63f	1584	*/
andrewbonney	0:ec559500a63f	1585	void
andrewbonney	0:ec559500a63f	1586	tcp_debug_print_pcbs(void)
andrewbonney	0:ec559500a63f	1587	{
andrewbonney	0:ec559500a63f	1588	struct tcp_pcb *pcb;
andrewbonney	0:ec559500a63f	1589	LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
andrewbonney	0:ec559500a63f	1590	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
andrewbonney	0:ec559500a63f	1591	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
andrewbonney	0:ec559500a63f	1592	pcb->local_port, pcb->remote_port,
andrewbonney	0:ec559500a63f	1593	pcb->snd_nxt, pcb->rcv_nxt));
andrewbonney	0:ec559500a63f	1594	tcp_debug_print_state(pcb->state);
andrewbonney	0:ec559500a63f	1595	}
andrewbonney	0:ec559500a63f	1596	LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
andrewbonney	0:ec559500a63f	1597	for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
andrewbonney	0:ec559500a63f	1598	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
andrewbonney	0:ec559500a63f	1599	pcb->local_port, pcb->remote_port,
andrewbonney	0:ec559500a63f	1600	pcb->snd_nxt, pcb->rcv_nxt));
andrewbonney	0:ec559500a63f	1601	tcp_debug_print_state(pcb->state);
andrewbonney	0:ec559500a63f	1602	}
andrewbonney	0:ec559500a63f	1603	LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
andrewbonney	0:ec559500a63f	1604	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
andrewbonney	0:ec559500a63f	1605	LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
andrewbonney	0:ec559500a63f	1606	pcb->local_port, pcb->remote_port,
andrewbonney	0:ec559500a63f	1607	pcb->snd_nxt, pcb->rcv_nxt));
andrewbonney	0:ec559500a63f	1608	tcp_debug_print_state(pcb->state);
andrewbonney	0:ec559500a63f	1609	}
andrewbonney	0:ec559500a63f	1610	}
andrewbonney	0:ec559500a63f	1611
andrewbonney	0:ec559500a63f	1612	/**
andrewbonney	0:ec559500a63f	1613	* Check state consistency of the tcp_pcb lists.
andrewbonney	0:ec559500a63f	1614	*/
andrewbonney	0:ec559500a63f	1615	s16_t
andrewbonney	0:ec559500a63f	1616	tcp_pcbs_sane(void)
andrewbonney	0:ec559500a63f	1617	{
andrewbonney	0:ec559500a63f	1618	struct tcp_pcb *pcb;
andrewbonney	0:ec559500a63f	1619	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
andrewbonney	0:ec559500a63f	1620	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
andrewbonney	0:ec559500a63f	1621	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
andrewbonney	0:ec559500a63f	1622	LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
andrewbonney	0:ec559500a63f	1623	}
andrewbonney	0:ec559500a63f	1624	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
andrewbonney	0:ec559500a63f	1625	LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
andrewbonney	0:ec559500a63f	1626	}
andrewbonney	0:ec559500a63f	1627	return 1;
andrewbonney	0:ec559500a63f	1628	}
andrewbonney	0:ec559500a63f	1629	#endif /* TCP_DEBUG */
andrewbonney	0:ec559500a63f	1630
andrewbonney	0:ec559500a63f	1631	#endif /* LWIP_TCP */

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Type:	Library
Created:	08 Apr 2011
Imports:	86
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	3

lwip/core/tcp.c@0:ec559500a63f, 2011-04-08 (annotated)

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