nexmon – Rev 1
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/*
* 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
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include "interface.h"
#include "extract.h"
/*
* from: NetBSD: if_arc.h,v 1.13 1999/11/19 20:41:19 thorpej Exp
*/
/*
* Structure of a 2.5MB/s Arcnet header on the BSDs,
* as given to interface code.
*/
struct arc_header {
uint8_t arc_shost;
uint8_t arc_dhost;
uint8_t arc_type;
/*
* only present for newstyle encoding with LL fragmentation.
* Don't use sizeof(anything), use ARC_HDR{,NEW}LEN instead.
*/
uint8_t arc_flag;
uint16_t arc_seqid;
/*
* only present in exception packets (arc_flag == 0xff)
*/
uint8_t arc_type2; /* same as arc_type */
uint8_t arc_flag2; /* real flag value */
uint16_t arc_seqid2; /* real seqid value */
};
#define ARC_HDRLEN 3
#define ARC_HDRNEWLEN 6
#define ARC_HDRNEWLEN_EXC 10
/* RFC 1051 */
#define ARCTYPE_IP_OLD 240 /* IP protocol */
#define ARCTYPE_ARP_OLD 241 /* address resolution protocol */
/* RFC 1201 */
#define ARCTYPE_IP 212 /* IP protocol */
#define ARCTYPE_ARP 213 /* address resolution protocol */
#define ARCTYPE_REVARP 214 /* reverse addr resolution protocol */
#define ARCTYPE_ATALK 221 /* Appletalk */
#define ARCTYPE_BANIAN 247 /* Banyan Vines */
#define ARCTYPE_IPX 250 /* Novell IPX */
#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 {
uint8_t arc_shost;
uint8_t arc_dhost;
uint16_t arc_offset;
uint8_t arc_type;
/*
* only present for newstyle encoding with LL fragmentation.
* Don't use sizeof(anything), use ARC_LINUX_HDR{,NEW}LEN
* instead.
*/
uint8_t arc_flag;
uint16_t arc_seqid;
};
#define ARC_LINUX_HDRLEN 5
#define ARC_LINUX_HDRNEWLEN 8
static int arcnet_encap_print(netdissect_options *, u_char arctype, const u_char *p,
u_int length, u_int caplen);
static const struct tok arctypemap[] = {
{ ARCTYPE_IP_OLD, "oldip" },
{ ARCTYPE_ARP_OLD, "oldarp" },
{ ARCTYPE_IP, "ip" },
{ ARCTYPE_ARP, "arp" },
{ ARCTYPE_REVARP, "rarp" },
{ ARCTYPE_ATALK, "atalk" },
{ ARCTYPE_BANIAN, "banyan" },
{ ARCTYPE_IPX, "ipx" },
{ ARCTYPE_INET6, "ipv6" },
{ ARCTYPE_DIAGNOSE, "diag" },
{ 0, 0 }
};
static inline void
arcnet_print(netdissect_options *ndo, const u_char *bp, u_int length, int phds,
int flag, u_int seqid)
{
const struct arc_header *ap;
const char *arctypename;
ap = (const struct arc_header *)bp;
if (ndo->ndo_qflag) {
ND_PRINT((ndo, "%02x %02x %d: ",
ap->arc_shost,
ap->arc_dhost,
length));
return;
}
arctypename = tok2str(arctypemap, "%02x", ap->arc_type);
if (!phds) {
ND_PRINT((ndo, "%02x %02x %s %d: ",
ap->arc_shost, ap->arc_dhost, arctypename,
length));
return;
}
if (flag == 0) {
ND_PRINT((ndo, "%02x %02x %s seqid %04x %d: ",
ap->arc_shost, ap->arc_dhost, arctypename, seqid,
length));
return;
}
if (flag & 1)
ND_PRINT((ndo, "%02x %02x %s seqid %04x "
"(first of %d fragments) %d: ",
ap->arc_shost, ap->arc_dhost, arctypename, seqid,
(flag + 3) / 2, length));
else
ND_PRINT((ndo, "%02x %02x %s seqid %04x "
"(fragment %d) %d: ",
ap->arc_shost, ap->arc_dhost, arctypename, seqid,
flag/2 + 1, length));
}
/*
* 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.
*/
u_int
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, flag = 0, archdrlen = 0;
u_int seqid = 0;
u_char arc_type;
if (caplen < ARC_HDRLEN || length < ARC_HDRLEN) {
ND_PRINT((ndo, "[|arcnet]"));
return (caplen);
}
ap = (const struct arc_header *)p;
arc_type = ap->arc_type;
switch (arc_type) {
default:
phds = 1;
break;
case ARCTYPE_IP_OLD:
case ARCTYPE_ARP_OLD:
case ARCTYPE_DIAGNOSE:
phds = 0;
archdrlen = ARC_HDRLEN;
break;
}
if (phds) {
if (caplen < ARC_HDRNEWLEN || length < ARC_HDRNEWLEN) {
arcnet_print(ndo, p, length, 0, 0, 0);
ND_PRINT((ndo, "[|phds]"));
return (caplen);
}
if (ap->arc_flag == 0xff) {
if (caplen < ARC_HDRNEWLEN_EXC || length < ARC_HDRNEWLEN_EXC) {
arcnet_print(ndo, p, length, 0, 0, 0);
ND_PRINT((ndo, "[|phds extended]"));
return (caplen);
}
flag = ap->arc_flag2;
seqid = EXTRACT_16BITS(&ap->arc_seqid2);
archdrlen = ARC_HDRNEWLEN_EXC;
} else {
flag = ap->arc_flag;
seqid = EXTRACT_16BITS(&ap->arc_seqid);
archdrlen = ARC_HDRNEWLEN;
}
}
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.
*/
return (archdrlen);
}
if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
ND_DEFAULTPRINT(p, caplen);
return (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.
*/
u_int
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;
int archdrlen = 0;
u_char arc_type;
if (caplen < ARC_LINUX_HDRLEN || length < ARC_LINUX_HDRLEN) {
ND_PRINT((ndo, "[|arcnet]"));
return (caplen);
}
ap = (const struct arc_linux_header *)p;
arc_type = ap->arc_type;
switch (arc_type) {
default:
archdrlen = ARC_LINUX_HDRNEWLEN;
if (caplen < ARC_LINUX_HDRNEWLEN || length < ARC_LINUX_HDRNEWLEN) {
ND_PRINT((ndo, "[|arcnet]"));
return (caplen);
}
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);
return (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.
*/
static int
arcnet_encap_print(netdissect_options *ndo, u_char arctype, const u_char *p,
u_int length, u_int caplen)
{
switch (arctype) {
case ARCTYPE_IP_OLD:
case ARCTYPE_IP:
ip_print(ndo, p, length);
return (1);
case ARCTYPE_INET6:
ip6_print(ndo, p, length);
return (1);
case ARCTYPE_ARP_OLD:
case ARCTYPE_ARP:
case ARCTYPE_REVARP:
arp_print(ndo, p, length, caplen);
return (1);
case ARCTYPE_ATALK: /* XXX was this ever used? */
if (ndo->ndo_vflag)
ND_PRINT((ndo, "et1 "));
atalk_print(ndo, p, length);
return (1);
case ARCTYPE_IPX:
ipx_print(ndo, p, length);
return (1);
default:
return (0);
}
}
/*
* Local Variables:
* c-style: bsd
* End:
*/