mirror of https://github.com/jeelabs/esp-link.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
120 lines
4.5 KiB
120 lines
4.5 KiB
10 years ago
|
/**
|
||
|
|
* @file
|
||
|
|
*
|
||
|
|
* AutoIP Automatic LinkLocal IP Configuration
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
*
|
||
|
|
* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without modification,
|
||
|
|
* are permitted provided that the following conditions are met:
|
||
|
|
*
|
||
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
||
|
|
* this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
||
|
|
* this list of conditions and the following disclaimer in the documentation
|
||
|
|
* and/or other materials provided with the distribution.
|
||
|
|
* 3. The name of the author may not be used to endorse or promote products
|
||
|
|
* derived from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
||
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
|
||
|
|
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
||
|
|
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
||
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
|
||
|
|
* OF SUCH DAMAGE.
|
||
|
|
*
|
||
|
|
* Author: Dominik Spies <kontakt@dspies.de>
|
||
|
|
*
|
||
|
|
* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
|
||
|
|
* with RFC 3927.
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* Please coordinate changes and requests with Dominik Spies
|
||
|
|
* <kontakt@dspies.de>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __LWIP_AUTOIP_H__
|
||
|
|
#define __LWIP_AUTOIP_H__
|
||
|
|
|
||
|
|
#include "lwip/opt.h"
|
||
|
|
|
||
|
|
#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
|
||
|
|
|
||
|
|
#include "lwip/netif.h"
|
||
|
|
#include "lwip/udp.h"
|
||
|
|
#include "netif/etharp.h"
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* AutoIP Timing */
|
||
|
|
#define AUTOIP_TMR_INTERVAL 100
|
||
|
|
#define AUTOIP_TICKS_PER_SECOND (1000 / AUTOIP_TMR_INTERVAL)
|
||
|
|
|
||
|
|
/* RFC 3927 Constants */
|
||
|
|
#define PROBE_WAIT 1 /* second (initial random delay) */
|
||
|
|
#define PROBE_MIN 1 /* second (minimum delay till repeated probe) */
|
||
|
|
#define PROBE_MAX 2 /* seconds (maximum delay till repeated probe) */
|
||
|
|
#define PROBE_NUM 3 /* (number of probe packets) */
|
||
|
|
#define ANNOUNCE_NUM 2 /* (number of announcement packets) */
|
||
|
|
#define ANNOUNCE_INTERVAL 2 /* seconds (time between announcement packets) */
|
||
|
|
#define ANNOUNCE_WAIT 2 /* seconds (delay before announcing) */
|
||
|
|
#define MAX_CONFLICTS 10 /* (max conflicts before rate limiting) */
|
||
|
|
#define RATE_LIMIT_INTERVAL 60 /* seconds (delay between successive attempts) */
|
||
|
|
#define DEFEND_INTERVAL 10 /* seconds (min. wait between defensive ARPs) */
|
||
|
|
|
||
|
|
/* AutoIP client states */
|
||
|
|
#define AUTOIP_STATE_OFF 0
|
||
|
|
#define AUTOIP_STATE_PROBING 1
|
||
|
|
#define AUTOIP_STATE_ANNOUNCING 2
|
||
|
|
#define AUTOIP_STATE_BOUND 3
|
||
|
|
|
||
|
|
struct autoip
|
||
|
|
{
|
||
|
|
ip_addr_t llipaddr; /* the currently selected, probed, announced or used LL IP-Address */
|
||
|
|
u8_t state; /* current AutoIP state machine state */
|
||
|
|
u8_t sent_num; /* sent number of probes or announces, dependent on state */
|
||
|
|
u16_t ttw; /* ticks to wait, tick is AUTOIP_TMR_INTERVAL long */
|
||
|
|
u8_t lastconflict; /* ticks until a conflict can be solved by defending */
|
||
|
|
u8_t tried_llipaddr; /* total number of probed/used Link Local IP-Addresses */
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/** Init srand, has to be called before entering mainloop */
|
||
|
|
void autoip_init(void);
|
||
|
|
|
||
|
|
/** Set a struct autoip allocated by the application to work with */
|
||
|
|
void autoip_set_struct(struct netif *netif, struct autoip *autoip);
|
||
|
|
|
||
|
|
/** Start AutoIP client */
|
||
|
|
err_t autoip_start(struct netif *netif);
|
||
|
|
|
||
|
|
/** Stop AutoIP client */
|
||
|
|
err_t autoip_stop(struct netif *netif);
|
||
|
|
|
||
|
|
/** Handles every incoming ARP Packet, called by etharp_arp_input */
|
||
|
|
void autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr);
|
||
|
|
|
||
|
|
/** Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds */
|
||
|
|
void autoip_tmr(void);
|
||
|
|
|
||
|
|
/** Handle a possible change in the network configuration */
|
||
|
|
void autoip_network_changed(struct netif *netif);
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* LWIP_AUTOIP */
|
||
|
|
|
||
|
|
#endif /* __LWIP_AUTOIP_H__ */
|