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EthernetNetIf/LPC2368/lwip/include/ipv4/lwip/autoip.h@0:58c3d014a4e7, 2011-09-06 (annotated)

Committer:
slowness
Date:
Tue Sep 06 18:05:46 2011 +0000
Revision:
0:58c3d014a4e7

        

        
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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__ */