120 lines
4.5 KiB
C
120 lines
4.5 KiB
C
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/**
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* @file
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*
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* AutoIP Automatic LinkLocal IP Configuration
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*/
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/*
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*
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* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
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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 modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Dominik Spies <kontakt@dspies.de>
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*
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* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
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* with RFC 3927.
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*
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*
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* Please coordinate changes and requests with Dominik Spies
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* <kontakt@dspies.de>
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*/
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#ifndef __LWIP_AUTOIP_H__
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#define __LWIP_AUTOIP_H__
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#include "lwip/opt.h"
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#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/netif.h"
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#include "lwip/udp.h"
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#include "netif/etharp.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* AutoIP Timing */
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#define AUTOIP_TMR_INTERVAL 100
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#define AUTOIP_TICKS_PER_SECOND (1000 / AUTOIP_TMR_INTERVAL)
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/* RFC 3927 Constants */
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#define PROBE_WAIT 1 /* second (initial random delay) */
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#define PROBE_MIN 1 /* second (minimum delay till repeated probe) */
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#define PROBE_MAX 2 /* seconds (maximum delay till repeated probe) */
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#define PROBE_NUM 3 /* (number of probe packets) */
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#define ANNOUNCE_NUM 2 /* (number of announcement packets) */
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#define ANNOUNCE_INTERVAL 2 /* seconds (time between announcement packets) */
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#define ANNOUNCE_WAIT 2 /* seconds (delay before announcing) */
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#define MAX_CONFLICTS 10 /* (max conflicts before rate limiting) */
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#define RATE_LIMIT_INTERVAL 60 /* seconds (delay between successive attempts) */
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#define DEFEND_INTERVAL 10 /* seconds (min. wait between defensive ARPs) */
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/* AutoIP client states */
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#define AUTOIP_STATE_OFF 0
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#define AUTOIP_STATE_PROBING 1
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#define AUTOIP_STATE_ANNOUNCING 2
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#define AUTOIP_STATE_BOUND 3
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struct autoip
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{
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ip_addr_t llipaddr; /* the currently selected, probed, announced or used LL IP-Address */
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u8_t state; /* current AutoIP state machine state */
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u8_t sent_num; /* sent number of probes or announces, dependent on state */
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u16_t ttw; /* ticks to wait, tick is AUTOIP_TMR_INTERVAL long */
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u8_t lastconflict; /* ticks until a conflict can be solved by defending */
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u8_t tried_llipaddr; /* total number of probed/used Link Local IP-Addresses */
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};
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/** Init srand, has to be called before entering mainloop */
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void autoip_init(void);
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/** Set a struct autoip allocated by the application to work with */
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void autoip_set_struct(struct netif *netif, struct autoip *autoip);
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/** Start AutoIP client */
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err_t autoip_start(struct netif *netif);
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/** Stop AutoIP client */
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err_t autoip_stop(struct netif *netif);
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/** Handles every incoming ARP Packet, called by etharp_arp_input */
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void autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr);
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/** Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds */
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void autoip_tmr(void);
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/** Handle a possible change in the network configuration */
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void autoip_network_changed(struct netif *netif);
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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_AUTOIP */
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#endif /* __LWIP_AUTOIP_H__ */
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