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* uip: time out an ESTABLISHED connection whose peer went silent uIP has no keepalive and no idle timeout for an ESTABLISHED connection, so a peer that vanishes without FIN or RST holds it open forever. A crashed client does it, and so does a SYN caught while the switch is still booting. With UIP_CONF_MAX_CONNECTIONS = 1 that wedges the single slot: the web UI stops answering, port 80 no longer even SYN-ACKs, and only a power cycle recovers it. Every other TCP state already has an exit path (UIP_MAXRTX, UIP_TIME_WAIT_TIMEOUT); idle ESTABLISHED was the one hole. Close it inside uIP rather than in httpd, so any future TCP service is covered too. The retransmission timer is unused while nothing is in flight, so the idle count lives in it: a 1 Hz strobe derived from the uip_periodic() rate ages it, any arriving segment clears it, and past the limit the connection is aborted through the same path as UIP_MAXRTX. Two new options in uipopt.h, default off; this project enables 30 s. httpd also joins uip_timedout() to its cleanup: it only handled closed and aborted, so both this timeout and the existing UIP_MAXRTX one would have left the transfer state stuck on a dead connection. * uip: keep the tuning values out of the prose The comment named the timeout and the tick rate, which go stale the moment either constant is edited. It now says why an idle connection is aged out and leaves the numbers to the defines under it.
196 lines
5.1 KiB
C
196 lines
5.1 KiB
C
/**
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* \addtogroup uipopt
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* @{
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*/
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/**
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* \name Project-specific configuration options
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* @{
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*
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* uIP has a number of configuration options that can be overridden
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* for each project. These are kept in a project-specific uip-conf.h
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* file and all configuration names have the prefix UIP_CONF.
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*/
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/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack
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*
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* $Id: uip-conf.h,v 1.6 2006/06/12 08:00:31 adam Exp $
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*/
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/**
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* \file
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* An example uIP configuration file
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#ifndef __UIP_CONF_H__
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#define __UIP_CONF_H__
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#include <stdint.h>
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#define UIP_CONF_EXTERNAL_BUFFER
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#define UIP_ARCH_CHKSUM 1
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#define UIP_ARCH_IPCHKSUM 1
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/**
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* 8 bit datatype
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*
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* This typedef defines the 8-bit type used throughout uIP.
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*
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* \hideinitializer
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*/
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typedef uint8_t u8_t;
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/**
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* 16 bit datatype
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*
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* This typedef defines the 16-bit type used throughout uIP.
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*
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* \hideinitializer
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*/
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typedef uint16_t u16_t;
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/**
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* Statistics datatype
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*
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* This typedef defines the dataype used for keeping statistics in
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* uIP.
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*
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* \hideinitializer
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*/
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typedef unsigned short uip_stats_t;
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/**
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* Maximum number of TCP connections. TODO: Increase this, but also make the socket state/buffer per-connection.
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*
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* \hideinitializer
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*/
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#define UIP_CONF_MAX_CONNECTIONS 1
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/**
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* This httpd closes after every response, so an ESTABLISHED connection
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* that stays idle is a peer that died or never sent its request. With a
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* single connection slot it would hold the web UI until the next power
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* cycle, so it is aged out instead.
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*
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* uip_periodic() runs from idle() once per system tick; interrupt
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* wake-ups only add sweeps, so the timeout can fire early but never
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* late.
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*
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* \hideinitializer
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*/
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#define UIP_CONF_IDLE_PERIODS 200
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#define UIP_CONF_IDLE_TIMEOUT 30
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/**
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* Maximum number of listening TCP ports. TODO: increase this!
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*
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* \hideinitializer
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*/
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#define UIP_CONF_MAX_LISTENPORTS 1
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/**
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* uIP buffer size.
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*
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* Sized to the largest frame the CPU port accepts on ingress: anything above
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* that the NIC drops in hardware, so a larger buffer only costs XDATA. Measured
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* with ICMP, which bypasses MSS and so probes the hardware directly: a 1502-byte
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* payload is answered and 1503 is not, which puts the frame at 1556 bytes of
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* uip_buf. The limit is the NIC's rather than a port's, so how the frame was
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* tagged on the wire does not change it.
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*
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* \hideinitializer
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*/
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#define UIP_CONF_BUFFER_SIZE 1556
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/**
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* Bytes of the buffer kept out of the advertised MSS.
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*
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* \hideinitializer
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*/
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#define UIP_CONF_BUFFER_EXTRA 30
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/**
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* CPU byte order.
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*
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* \hideinitializer
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*/
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#define UIP_CONF_BYTE_ORDER LITTLE_ENDIAN
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/**
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* Logging on or off
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*
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* \hideinitializer
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*/
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#define UIP_CONF_LOGGING 1
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/**
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* UDP support on or off
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*
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* \hideinitializer
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*/
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#define UIP_CONF_UDP 1
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/**
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* UDP checksums on or off
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* The RTL8372/3 are able to calculate and verify all L2 and L3 checksums
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* in hardware. The TX checksums are configured in the CPU-tag of outgoing
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* packets, while the RTL837X_NIC_RX_CTRL register configures the verification
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* of the checksum of inbound packets and subsequent possible drop.
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*
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* \hideinitializer
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*/
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#define UIP_CONF_UDP_CHECKSUMS 0
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/**
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* uIP statistics on or off
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*
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* \hideinitializer
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*/
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#define UIP_CONF_STATISTICS 1
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/* Here we include the header file for the application(s) we use in
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our project. */
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/*#include "smtp.h"*/
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#include "httpd.h"
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#include "udp_apps.h"
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/*#include "telnetd.h"*/
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/*#include "webserver.h" */
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/*#include "dhcpc.h"*/
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/*#include "resolv.h"*/
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/*#include "webclient.h"*/
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#endif /* __UIP_CONF_H__ */
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/** @} */
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/** @} */
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