/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* The 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: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* From: NetBSD: print-arcnet.c,v 1.2 2000/04/24 13:02:28 itojun Exp
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-arcnet.c,v 1.10 2024/09/02 16:15:30 christos Exp $");
#endif
/*
* Structure of a 2.5MB/s Arcnet header on the BSDs,
* as given to interface code.
*/
struct arc_header {
nd_uint8_t arc_shost;
nd_uint8_t arc_dhost;
nd_uint8_t arc_type;
/*
* only present for newstyle encoding with LL fragmentation.
* Don't use sizeof(anything), use ARC_HDR{,NEW}LEN instead.
*/
nd_uint8_t arc_flag;
nd_uint16_t arc_seqid;
/*
* only present in exception packets (arc_flag == 0xff)
*/
nd_uint8_t arc_type2; /* same as arc_type */
nd_uint8_t arc_flag2; /* real flag value */
nd_uint16_t arc_seqid2; /* real seqid value */
};
#define ARCTYPE_INET6 0xc4 /* IPng */
#define ARCTYPE_DIAGNOSE 0x80 /* as per ANSI/ATA 878.1 */
/*
* Structure of a 2.5MB/s Arcnet header on Linux. Linux has
* an extra "offset" field when given to interface code, and
* never presents packets that look like exception frames.
*/
struct arc_linux_header {
nd_uint8_t arc_shost;
nd_uint8_t arc_dhost;
nd_uint16_t arc_offset;
nd_uint8_t arc_type;
/*
* only present for newstyle encoding with LL fragmentation.
* Don't use sizeof(anything), use ARC_LINUX_HDR{,NEW}LEN
* instead.
*/
nd_uint8_t arc_flag;
nd_uint16_t arc_seqid;
};
/*
* This is the top level routine of the printer. 'p' points
* to the ARCNET header of the packet, 'h->ts' is the timestamp,
* 'h->len' is the length of the packet off the wire, and 'h->caplen'
* is the number of bytes actually captured.
*/
void
arcnet_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
const struct arc_header *ap;
int phds;
u_int flag = 0, archdrlen = 0;
u_int seqid = 0;
u_char arc_type;
if (ndo->ndo_eflag)
arcnet_print(ndo, p, length, phds, flag, seqid);
/*
* Go past the ARCNET header.
*/
length -= archdrlen;
caplen -= archdrlen;
p += archdrlen;
if (phds && flag && (flag & 1) == 0) {
/*
* This is a middle fragment.
*/
ndo->ndo_ll_hdr_len += archdrlen;
return;
}
if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
ND_DEFAULTPRINT(p, caplen);
ndo->ndo_ll_hdr_len += archdrlen;
}
/*
* This is the top level routine of the printer. 'p' points
* to the ARCNET header of the packet, 'h->ts' is the timestamp,
* 'h->len' is the length of the packet off the wire, and 'h->caplen'
* is the number of bytes actually captured. It is quite similar
* to the non-Linux style printer except that Linux doesn't ever
* supply packets that look like exception frames, it always supplies
* reassembled packets rather than raw frames, and headers have an
* extra "offset" field between the src/dest and packet type.
*/
void
arcnet_linux_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
const struct arc_linux_header *ap;
ap = (const struct arc_linux_header *)p;
arc_type = GET_U_1(ap->arc_type);
switch (arc_type) {
default:
archdrlen = ARC_LINUX_HDRNEWLEN;
if (caplen < ARC_LINUX_HDRNEWLEN) {
ndo->ndo_ll_hdr_len += caplen;
nd_trunc_longjmp(ndo);
}
break;
case ARCTYPE_IP_OLD:
case ARCTYPE_ARP_OLD:
case ARCTYPE_DIAGNOSE:
archdrlen = ARC_LINUX_HDRLEN;
break;
}
if (ndo->ndo_eflag)
arcnet_print(ndo, p, length, 0, 0, 0);
/*
* Go past the ARCNET header.
*/
length -= archdrlen;
caplen -= archdrlen;
p += archdrlen;
if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
ND_DEFAULTPRINT(p, caplen);
ndo->ndo_ll_hdr_len += archdrlen;
}
/*
* Prints the packet encapsulated in an ARCnet data field,
* given the ARCnet system code.
*
* Returns non-zero if it can do so, zero if the system code is unknown.
*/
