/* $NetBSD: ethernet.c,v 1.2.6.1 2024/02/29 11:39:17 martin Exp $ */ /* ethernet.c Packet assembly code, originally contributed by Archie Cobbs. */ /* * Copyright (C) 2004-2022 Internet Systems Consortium, Inc. ("ISC") * Copyright (c) 1996-2003 by Internet Software Consortium * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Internet Systems Consortium, Inc. * PO Box 360 * Newmarket, NH 03857 USA * * https://www.isc.org/ * */ #include __RCSID("$NetBSD: ethernet.c,v 1.2.6.1 2024/02/29 11:39:17 martin Exp $"); #include "dhcpd.h" #if defined (PACKET_ASSEMBLY) || defined (PACKET_DECODING) #include "includes/netinet/if_ether.h" #endif /* PACKET_ASSEMBLY || PACKET_DECODING */ #if defined (PACKET_ASSEMBLY) /* Assemble an hardware header... */ void assemble_ethernet_header (interface, buf, bufix, to) struct interface_info *interface; unsigned char *buf; unsigned *bufix; struct hardware *to; { struct isc_ether_header eh; if (to && to -> hlen == 7) /* XXX */ memcpy (eh.ether_dhost, &to -> hbuf [1], sizeof eh.ether_dhost); else memset (eh.ether_dhost, 0xff, sizeof (eh.ether_dhost)); if (interface -> hw_address.hlen - 1 == sizeof (eh.ether_shost)) memcpy (eh.ether_shost, &interface -> hw_address.hbuf [1], sizeof (eh.ether_shost)); else memset (eh.ether_shost, 0x00, sizeof (eh.ether_shost)); eh.ether_type = htons (ETHERTYPE_IP); memcpy (&buf [*bufix], &eh, ETHER_HEADER_SIZE); *bufix += ETHER_HEADER_SIZE; } #endif /* PACKET_ASSEMBLY */ #ifdef PACKET_DECODING /* Decode a hardware header... */ ssize_t decode_ethernet_header (interface, buf, bufix, from) struct interface_info *interface; unsigned char *buf; unsigned bufix; struct hardware *from; { struct isc_ether_header eh; memcpy (&eh, buf + bufix, ETHER_HEADER_SIZE); #ifdef USERLAND_FILTER if (ntohs (eh.ether_type) != ETHERTYPE_IP) return -1; #endif memcpy (&from -> hbuf [1], eh.ether_shost, sizeof (eh.ether_shost)); from -> hbuf [0] = ARPHRD_ETHER; from -> hlen = (sizeof eh.ether_shost) + 1; return ETHER_HEADER_SIZE; } #endif /* PACKET_DECODING */