199767f8919635c4928607450d9e0abb932109ceToomas Soome/* Taken from $NetBSD: net.c,v 1.20 1997/12/26 22:41:30 scottr Exp $ */
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Copyright (c) 1992 Regents of the University of California.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * All rights reserved.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * This software was developed by the Computer Systems Engineering group
199767f8919635c4928607450d9e0abb932109ceToomas Soome * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
199767f8919635c4928607450d9e0abb932109ceToomas Soome * contributed to Berkeley.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Redistribution and use in source and binary forms, with or without
199767f8919635c4928607450d9e0abb932109ceToomas Soome * modification, are permitted provided that the following conditions
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 1. Redistributions of source code must retain the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer in the
199767f8919635c4928607450d9e0abb932109ceToomas Soome * documentation and/or other materials provided with the distribution.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 4. Neither the name of the University nor the names of its contributors
199767f8919635c4928607450d9e0abb932109ceToomas Soome * may be used to endorse or promote products derived from this software
199767f8919635c4928607450d9e0abb932109ceToomas Soome * without specific prior written permission.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
199767f8919635c4928607450d9e0abb932109ceToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
199767f8919635c4928607450d9e0abb932109ceToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
199767f8919635c4928607450d9e0abb932109ceToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
199767f8919635c4928607450d9e0abb932109ceToomas Soome * SUCH DAMAGE.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
199767f8919635c4928607450d9e0abb932109ceToomas Soome/* Caller must leave room for ethernet, ip and udp headers in front!! */
199767f8919635c4928607450d9e0abb932109ceToomas Soome ip->ip_sum = in_cksum(ip, sizeof(*ip)); /* short, but special */
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Calculate checksum (must save and restore ip header) */
199767f8919635c4928607450d9e0abb932109ceToomas Soome if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
199767f8919635c4928607450d9e0abb932109ceToomas Soome netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask))
199767f8919635c4928607450d9e0abb932109ceToomas Soome return (-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome panic("sendudp: bad write (%zd != %zd)", cc, len);
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Receive a UDP packet and validate it is for us.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Caller leaves room for the headers (Ether, IP, UDP)
199767f8919635c4928607450d9e0abb932109ceToomas Soome n = readether(d, ip, len + sizeof(*ip) + sizeof(*uh), tleft, &etype);
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Ethernet address checks now in readether() */
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Need to respond to ARP requests. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Send ARP reply */
199767f8919635c4928607450d9e0abb932109ceToomas Soome printf("readudp: not IP. ether_type=%x\n", etype);
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Check ip header */
199767f8919635c4928607450d9e0abb932109ceToomas Soome printf("readudp: IP version or not UDP. ip_v=%d ip_p=%d\n", ip->ip_v, ip->ip_p);
199767f8919635c4928607450d9e0abb932109ceToomas Soome if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome printf("readudp: bad saddr %s != ", inet_ntoa(d->myip));
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* If there were ip options, make them go away */
199767f8919635c4928607450d9e0abb932109ceToomas Soome printf("readudp: huge packet, udp len %d\n", (int)n);
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Check checksum (must save and restore ip header) */