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/*
* Copyright (c) 1997-1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/* Modified from FreeBSD 2.1 sys/i386/boot/netboot */
/**************************************************************************
NETBOOT - BOOTP/TFTP Bootstrap Program
Author: Martin Renters
Date: Dec/93
**************************************************************************/
#include <oskit/c/arpa/inet.h>
#include <oskit/c/string.h>
#include <oskit/c/assert.h>
#include <stdio.h>
#include "udp.h"
#include "bootp.h"
/*
* IP checksum algorithm.
*/
unsigned short
bootp_ipchksum(void *ipv, int len)
{
unsigned short *ip = ipv;
unsigned long sum = 0;
len >>= 1;
while (len--) {
sum += *(ip++);
if (sum > 0xFFFF)
sum -= 0xFFFF;
}
return((~sum) & 0x0000FFFF);
}
/**************************************************************************
UDP_TRANSMIT - Send a UDP datagram
**************************************************************************/
int
bootp_udp_broadcast(char *ether_src,
unsigned long srcip,
unsigned short srcsock,
unsigned short destsock, int len, void *bufv)
{
static char ether_bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
char *buf = bufv;
struct iphdr *ip;
struct udphdr *udp;
oskit_u32_t temp;
ip = (struct iphdr *)buf;
udp = (struct udphdr *)(buf + sizeof(struct iphdr));
ip->verhdrlen = 0x45;
ip->service = 0;
ip->len = htons(len);
ip->ident = 0;
ip->frags = 0;
ip->ttl = 60;
ip->protocol = IP_UDP;
ip->chksum = 0;
temp = srcip;
memcpy(ip->src, &temp, 4);
temp = IP_BROADCAST;
memcpy(ip->dest, &temp, 4);
ip->chksum = bootp_ipchksum(buf, sizeof(struct iphdr));
udp->src = htons(srcsock);
udp->dest = htons(destsock);
udp->len = htons(len - sizeof(struct iphdr));
udp->chksum = 0;
bootp_eth_transmit(ether_src, ether_bcast, ETHERTYPE_IP, len, buf);
return(1);
}
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