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/*
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* arp.cpp - ip router
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*
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* Basilisk II (C) 1997-2008 Christian Bauer
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*
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* Windows platform specific code copyright (C) Lauri Pesonen
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "sysdeps.h"
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#include "cpu_emulation.h"
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#include "prefs.h"
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#include "ether_windows.h"
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#include "ether.h"
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#include "router.h"
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#include "router_types.h"
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#include "iphelp.h"
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#include "arp.h"
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#include "icmp.h"
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#include "dump.h"
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#if DEBUG
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#pragma optimize("",off)
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#endif
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#include "debug.h"
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// ARP queries can be replied immediately.
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bool write_arp( arp_t *req, int len )
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{
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D(bug("write_arp() len=%d, htype=%d, ptype=%04x, opcode=%d, halen=%d, palen=%d\r\n",len, ntohs(req->htype), ntohs(req->ptype), ntohs(req->opcode), req->halen, req->palen));
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start_icmp_listen();
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bool result = false;
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if( len >= sizeof(arp_t) &&
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req->htype == htons(arp_hwtype_enet) &&
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req->ptype == htons(mac_type_ip4) &&
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req->opcode == htons(arp_request) &&
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req->halen == 6 &&
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req->palen == 4
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)
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{
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if(memcmp( req->srcp, req->dstp, 4 ) == 0) {
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// No reply. MacOS is making sure that there are no duplicate ip addresses.
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// Update localhost (==Mac) ip address (needed by incoming icmp)
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macos_ip_address = ntohl( *((uint32 *)&req->srcp[0]) );
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D(bug("Mac ip: %02x %02x %02x %02x\r\n", req->srcp[0], req->srcp[1], req->srcp[2], req->srcp[3]));
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} else {
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arp_t arp;
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D(bug("Source NIC: %02x %02x %02x %02x\r\n", req->srcp[0], req->srcp[1], req->srcp[2], req->srcp[3]));
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D(bug("Dest NIC: %02x %02x %02x %02x\r\n", req->dstp[0], req->dstp[1], req->dstp[2], req->dstp[3]));
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// memcpy( arp.mac.dest, req->mac.src, 6 );
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memcpy( arp.mac.dest, ether_addr, 6 );
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memcpy( arp.mac.src, router_mac_addr, 6 );
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arp.mac.type = htons(mac_type_arp);
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arp.htype = htons(arp_hwtype_enet);
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arp.ptype = htons(mac_type_ip4);
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arp.halen = 6;
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arp.palen = 4;
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arp.opcode = htons(arp_reply);
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memcpy( arp.srch, router_mac_addr, 6 );
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memcpy( arp.srcp, req->dstp, 4 );
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// memcpy( arp.dsth, req->srch, 6 );
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memcpy( arp.dsth, ether_addr, 6 );
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memcpy( arp.dstp, req->srcp, 4 );
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// Update here, too, just in case.
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macos_ip_address = ntohl( *((uint32 *)&req->srcp[0]) );
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enqueue_packet( (uint8 *)&arp, sizeof(arp) );
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}
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result = true;
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}
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return result;
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}
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