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# arp.h

Go to the documentation of this file.

    00001 /*
    00002  * Copyright (c) 2001, Swedish Institute of Computer Science.
    00003  * All rights reserved.
    00004  *
    00005  * Redistribution and use in source and binary forms, with or without
    00006  * modification, are permitted provided that the following conditions
    00007  * are met:
    00008  * 1. Redistributions of source code must retain the above copyright
    00009  *    notice, this list of conditions and the following disclaimer.
    00010  * 2. Redistributions in binary form must reproduce the above copyright
    00011  *    notice, this list of conditions and the following disclaimer in the
    00012  *    documentation and/or other materials provided with the distribution.
    00013  * 3. All advertising materials mentioning features or use of this software
    00014  *    must display the following acknowledgement:
    00015  *      This product includes software developed by the Swedish Institute
    00016  *      of Computer Science and its contributors.
    00017  * 4. Neither the name of the Institute nor the names of its contributors
    00018  *    may be used to endorse or promote products derived from this software
    00019  *    without specific prior written permission.
    00020  *
    00021  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
    00022  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    00023  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    00024  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
    00025  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    00026  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    00027  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    00028  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    00029  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    00030  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    00031  * SUCH DAMAGE.
    00032  *
    00033  * This file is part of the lwIP TCP/IP stack.
    00034  *
    00035  * Author: Adam Dunkels <adam@sics.se>
    00036  *
    00037  * $Id: arp_8h-source.html 88 2016-01-12 00:11:29Z reddawg $
    00038  *
    00039  */
    00040
    00041 #ifndef __NETIF_ARP_H__
    00042 #define __NETIF_ARP_H__
    00043
    00044 #include "net/pbuf.h"
    00045 #include "net/ipv4/ip_addr.h"
    00046 #include "net/netif.h"
    00047
    00048 struct eth_addr {
    00049   PACK_STRUCT_FIELD(uInt8 addr[6]);
    00050 } PACK_STRUCT_STRUCT;
    00051
    00052 struct eth_hdr {
    00053   PACK_STRUCT_FIELD(struct eth_addr dest);
    00054   PACK_STRUCT_FIELD(struct eth_addr src);
    00055   PACK_STRUCT_FIELD(uInt16 type);
    00056 } PACK_STRUCT_STRUCT;
    00057
    00058 #define ARP_TMR_INTERVAL 10000
    00059
    00060 #define ETHTYPE_ARP 0x0806
    00061 #define ETHTYPE_IP  0x0800
    00062
    00063 /* Initializes ARP. */
    00064 void arp_init(void);
    00065
    00066 /* The arp_tmr() function should be called every ARP_TMR_INTERVAL
    00067    microseconds (10 seconds). This function is responsible for
    00068    expiring old entries in the ARP table. */
    00069 void arp_tmr(void);
    00070
    00071 /* Should be called for all incoming packets of IP kind. The function
    00072    does not alter the packet in any way, it just updates the ARP
    00073    table. After this function has been called, the normal TCP/IP stack
    00074    input function should be called. */
    00075 void arp_ip_input(struct netif *netif, struct pbuf *p);
    00076
    00077 /* Should be called for incoming ARP packets. The pbuf in the argument
    00078    is freed by this function. If the function returns a pbuf (i.e.,
    00079    returns non-NULL), that pbuf constitutes an ARP reply and should be
    00080    sent out on the Ethernet. */
    00081 struct pbuf *arp_arp_input(struct netif *netif, struct eth_addr *ethaddr,
    00082                            struct pbuf *p);
    00083
    00084 /* arp_loopup() is called to do an IP address -> Ethernet address
    00085    translation. If the function returns NULL, there is no mapping and
    00086    the arp_query() function should be called. */
    00087 struct eth_addr *arp_lookup(struct ip_addr *ipaddr);
    00088
    00089 /* Constructs an ARP query packet for the given IP address. The
    00090    function returns a pbuf that contains the reply and that should be
    00091    sent out on the Ethernet. */
    00092 struct pbuf *arp_query(struct netif *netif, struct eth_addr *ethaddr,
    00093                        struct ip_addr *ipaddr);
    00094
    00095 #endif /* __NETIF_ARP_H__ */