arp.h

/*-*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) 1997 Regents of the University of California.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Computer Systems
* Engineering Group at Lawrence Berkeley Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
/* Ported from CMU/Monarch's code, nov'98 -Padma.*/
 
#ifndef __arp_h__
#define __arp_h__
 
#include "scheduler.h"
#include "delay.h"
#include "lib/bsd-list.h"
 
#ifndef EADDRNOTAVAIL
#define EADDRNOTAVAIL 125
#endif /* !EADDRNOTAVAIL */
 
class LinkDelay;
class ARPEntry;
class ARPTable;
class LL;
class Mac;
 
LIST_HEAD(ARPTable_List, ARPTable);
LIST_HEAD(ARPEntry_List, ARPEntry);
 
/* ======================================================================
Address Resolution (ARP) Header
====================================================================== */
#define ARPHRD_ETHER 1 /* ethernet hardware format */
 
#define ARPOP_REQUEST 1 /* request to resolve address */
#define ARPOP_REPLY 2 /* response to previous request */
#define ARPOP_REVREQUEST 3 /* request protocol address */
#define ARPOP_REVREPLY 4 /* response giving protocol address */
#define ARPOP_INVREQUEST 8 /* request to identify peer */
#define ARPOP_INVREPLY 9 /* response identifying peer */
 
#define ARP_HDR_LEN 28
 
struct hdr_arp {
u_int16_t arp_hrd;
u_int16_t arp_pro;
u_int8_t arp_hln;
u_int8_t arp_pln;
u_int16_t arp_op;
int arp_sha;
u_int16_t pad1; // so offsets are correct
nsaddr_t arp_spa;
int arp_tha;
u_int16_t pad2; // so offsets are correct
nsaddr_t arp_tpa;
 
// Header access methods
static int offset_; // required by PacketHeaderManager
inline static int& offset() { return offset_; }
inline static hdr_arp* access(const Packet* p) {
return (hdr_arp*) p->access(offset_);
}
};
 
class ARPEntry {
friend class ARPTable;
public:
ARPEntry(ARPEntry_List* head, nsaddr_t dst) {
up_ = macaddr_ = count_ = 0;
ipaddr_ = dst;
hold_ = 0;
LIST_INSERT_HEAD(head, this, arp_link_);
}
inline ARPEntry* nextarp() { return arp_link_.le_next; }
 
private:
LIST_ENTRY(ARPEntry) arp_link_;
 
int up_;
nsaddr_t ipaddr_;
int macaddr_;
Packet *hold_;
int count_;
#define ARP_MAX_REQUEST_COUNT 3
};
 
class ARPTable : public LinkDelay {
public:
ARPTable(const char *tclnode, const char *tclmac);
 
int command(int argc, const char*const* argv);
int arpresolve(nsaddr_t dst, Packet *p, LL *ll);
void arpinput(Packet *p, LL *ll);
ARPEntry* arplookup(nsaddr_t dst);
void arprequest(nsaddr_t src, nsaddr_t dst, LL *ll);
 
void Terminate(void);
 
private:
inline int initialized() { return node_ && mac_; }
 
ARPEntry_List arphead_;
MobileNode *node_;
Mac *mac_;
 
/*
* Used to purge all of the ll->hold packets at the end of the
* simulation.
*/
public:
LIST_ENTRY(ARPTable) link_;
static ARPTable_List athead_;
};
 
#endif /* __arp_h__ */

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