f49c5d523a
MFC after: 1 month
417 lines
13 KiB
C
417 lines
13 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#define NETDISSECT_REWORKED
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <tcpdump-stdinc.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "ether.h"
|
|
#include "ethertype.h"
|
|
#include "extract.h" /* must come after interface.h */
|
|
|
|
static const char tstr[] = "[|ARP]";
|
|
|
|
/*
|
|
* Address Resolution Protocol.
|
|
*
|
|
* See RFC 826 for protocol description. ARP packets are variable
|
|
* in size; the arphdr structure defines the fixed-length portion.
|
|
* Protocol type values are the same as those for 10 Mb/s Ethernet.
|
|
* It is followed by the variable-sized fields ar_sha, arp_spa,
|
|
* arp_tha and arp_tpa in that order, according to the lengths
|
|
* specified. Field names used correspond to RFC 826.
|
|
*/
|
|
struct arp_pkthdr {
|
|
u_short ar_hrd; /* format of hardware address */
|
|
#define ARPHRD_ETHER 1 /* ethernet hardware format */
|
|
#define ARPHRD_IEEE802 6 /* token-ring hardware format */
|
|
#define ARPHRD_ARCNET 7 /* arcnet hardware format */
|
|
#define ARPHRD_FRELAY 15 /* frame relay hardware format */
|
|
#define ARPHRD_ATM2225 19 /* ATM (RFC 2225) */
|
|
#define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */
|
|
#define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */
|
|
u_short ar_pro; /* format of protocol address */
|
|
u_char ar_hln; /* length of hardware address */
|
|
u_char ar_pln; /* length of protocol address */
|
|
u_short ar_op; /* one of: */
|
|
#define ARPOP_REQUEST 1 /* request to resolve address */
|
|
#define ARPOP_REPLY 2 /* response to previous request */
|
|
#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
|
|
#define ARPOP_REVREPLY 4 /* response giving protocol address */
|
|
#define ARPOP_INVREQUEST 8 /* request to identify peer */
|
|
#define ARPOP_INVREPLY 9 /* response identifying peer */
|
|
#define ARPOP_NAK 10 /* NAK - only valif for ATM ARP */
|
|
|
|
/*
|
|
* The remaining fields are variable in size,
|
|
* according to the sizes above.
|
|
*/
|
|
#ifdef COMMENT_ONLY
|
|
u_char ar_sha[]; /* sender hardware address */
|
|
u_char ar_spa[]; /* sender protocol address */
|
|
u_char ar_tha[]; /* target hardware address */
|
|
u_char ar_tpa[]; /* target protocol address */
|
|
#endif
|
|
#define ar_sha(ap) (((const u_char *)((ap)+1))+0)
|
|
#define ar_spa(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln)
|
|
#define ar_tha(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln+(ap)->ar_pln)
|
|
#define ar_tpa(ap) (((const u_char *)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln)
|
|
};
|
|
|
|
#define ARP_HDRLEN 8
|
|
|
|
#define HRD(ap) EXTRACT_16BITS(&(ap)->ar_hrd)
|
|
#define HRD_LEN(ap) ((ap)->ar_hln)
|
|
#define PROTO_LEN(ap) ((ap)->ar_pln)
|
|
#define OP(ap) EXTRACT_16BITS(&(ap)->ar_op)
|
|
#define PRO(ap) EXTRACT_16BITS(&(ap)->ar_pro)
|
|
#define SHA(ap) (ar_sha(ap))
|
|
#define SPA(ap) (ar_spa(ap))
|
|
#define THA(ap) (ar_tha(ap))
|
|
#define TPA(ap) (ar_tpa(ap))
|
|
|
|
|
|
static const struct tok arpop_values[] = {
|
|
{ ARPOP_REQUEST, "Request" },
|
|
{ ARPOP_REPLY, "Reply" },
|
|
{ ARPOP_REVREQUEST, "Reverse Request" },
|
|
{ ARPOP_REVREPLY, "Reverse Reply" },
|
|
{ ARPOP_INVREQUEST, "Inverse Request" },
|
|
{ ARPOP_INVREPLY, "Inverse Reply" },
|
|
{ ARPOP_NAK, "NACK Reply" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const struct tok arphrd_values[] = {
|
|
{ ARPHRD_ETHER, "Ethernet" },
|
|
{ ARPHRD_IEEE802, "TokenRing" },
|
|
{ ARPHRD_ARCNET, "ArcNet" },
|
|
{ ARPHRD_FRELAY, "FrameRelay" },
|
|
{ ARPHRD_STRIP, "Strip" },
|
|
{ ARPHRD_IEEE1394, "IEEE 1394" },
|
|
{ ARPHRD_ATM2225, "ATM" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/*
|
|
* ATM Address Resolution Protocol.
|
|
*
|
|
* See RFC 2225 for protocol description. ATMARP packets are similar
|
|
* to ARP packets, except that there are no length fields for the
|
|
* protocol address - instead, there are type/length fields for
|
|
* the ATM number and subaddress - and the hardware addresses consist
|
|
* of an ATM number and an ATM subaddress.
|
|
*/
|
|
struct atmarp_pkthdr {
|
|
u_short aar_hrd; /* format of hardware address */
|
|
u_short aar_pro; /* format of protocol address */
|
|
u_char aar_shtl; /* length of source ATM number */
|
|
u_char aar_sstl; /* length of source ATM subaddress */
|
|
#define ATMARP_IS_E164 0x40 /* bit in type/length for E.164 format */
|
|
#define ATMARP_LEN_MASK 0x3F /* length of {sub}address in type/length */
|
|
u_short aar_op; /* same as regular ARP */
|
|
u_char aar_spln; /* length of source protocol address */
|
|
u_char aar_thtl; /* length of target ATM number */
|
|
u_char aar_tstl; /* length of target ATM subaddress */
|
|
u_char aar_tpln; /* length of target protocol address */
|
|
/*
|
|
* The remaining fields are variable in size,
|
|
* according to the sizes above.
|
|
*/
|
|
#ifdef COMMENT_ONLY
|
|
u_char aar_sha[]; /* source ATM number */
|
|
u_char aar_ssa[]; /* source ATM subaddress */
|
|
u_char aar_spa[]; /* sender protocol address */
|
|
u_char aar_tha[]; /* target ATM number */
|
|
u_char aar_tsa[]; /* target ATM subaddress */
|
|
u_char aar_tpa[]; /* target protocol address */
|
|
#endif
|
|
|
|
#define ATMHRD(ap) EXTRACT_16BITS(&(ap)->aar_hrd)
|
|
#define ATMSHRD_LEN(ap) ((ap)->aar_shtl & ATMARP_LEN_MASK)
|
|
#define ATMSSLN(ap) ((ap)->aar_sstl & ATMARP_LEN_MASK)
|
|
#define ATMSPROTO_LEN(ap) ((ap)->aar_spln)
|
|
#define ATMOP(ap) EXTRACT_16BITS(&(ap)->aar_op)
|
|
#define ATMPRO(ap) EXTRACT_16BITS(&(ap)->aar_pro)
|
|
#define ATMTHRD_LEN(ap) ((ap)->aar_thtl & ATMARP_LEN_MASK)
|
|
#define ATMTSLN(ap) ((ap)->aar_tstl & ATMARP_LEN_MASK)
|
|
#define ATMTPROTO_LEN(ap) ((ap)->aar_tpln)
|
|
#define aar_sha(ap) ((const u_char *)((ap)+1))
|
|
#define aar_ssa(ap) (aar_sha(ap) + ATMSHRD_LEN(ap))
|
|
#define aar_spa(ap) (aar_ssa(ap) + ATMSSLN(ap))
|
|
#define aar_tha(ap) (aar_spa(ap) + ATMSPROTO_LEN(ap))
|
|
#define aar_tsa(ap) (aar_tha(ap) + ATMTHRD_LEN(ap))
|
|
#define aar_tpa(ap) (aar_tsa(ap) + ATMTSLN(ap))
|
|
};
|
|
|
|
#define ATMSHA(ap) (aar_sha(ap))
|
|
#define ATMSSA(ap) (aar_ssa(ap))
|
|
#define ATMSPA(ap) (aar_spa(ap))
|
|
#define ATMTHA(ap) (aar_tha(ap))
|
|
#define ATMTSA(ap) (aar_tsa(ap))
|
|
#define ATMTPA(ap) (aar_tpa(ap))
|
|
|
|
static u_char ezero[6];
|
|
|
|
static void
|
|
atmarp_addr_print(netdissect_options *ndo,
|
|
const u_char *ha, u_int ha_len, const u_char *srca,
|
|
u_int srca_len)
|
|
{
|
|
if (ha_len == 0)
|
|
ND_PRINT((ndo, "<No address>"));
|
|
else {
|
|
ND_PRINT((ndo, "%s", linkaddr_string(ndo, ha, LINKADDR_ATM, ha_len)));
|
|
if (srca_len != 0)
|
|
ND_PRINT((ndo, ",%s",
|
|
linkaddr_string(ndo, srca, LINKADDR_ATM, srca_len)));
|
|
}
|
|
}
|
|
|
|
static void
|
|
atmarp_print(netdissect_options *ndo,
|
|
const u_char *bp, u_int length, u_int caplen)
|
|
{
|
|
const struct atmarp_pkthdr *ap;
|
|
u_short pro, hrd, op;
|
|
|
|
ap = (const struct atmarp_pkthdr *)bp;
|
|
ND_TCHECK(*ap);
|
|
|
|
hrd = ATMHRD(ap);
|
|
pro = ATMPRO(ap);
|
|
op = ATMOP(ap);
|
|
|
|
if (!ND_TTEST2(*aar_tpa(ap), ATMTPROTO_LEN(ap))) {
|
|
ND_PRINT((ndo, "%s", tstr));
|
|
ND_DEFAULTPRINT((const u_char *)ap, length);
|
|
return;
|
|
}
|
|
|
|
if (!ndo->ndo_eflag) {
|
|
ND_PRINT((ndo, "ARP, "));
|
|
}
|
|
|
|
if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
|
|
ATMSPROTO_LEN(ap) != 4 ||
|
|
ATMTPROTO_LEN(ap) != 4 ||
|
|
ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, "%s, %s (len %u/%u)",
|
|
tok2str(arphrd_values, "Unknown Hardware (%u)", hrd),
|
|
tok2str(ethertype_values, "Unknown Protocol (0x%04x)", pro),
|
|
ATMSPROTO_LEN(ap),
|
|
ATMTPROTO_LEN(ap)));
|
|
|
|
/* don't know know about the address formats */
|
|
if (!ndo->ndo_vflag) {
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* print operation */
|
|
ND_PRINT((ndo, "%s%s ",
|
|
ndo->ndo_vflag ? ", " : "",
|
|
tok2str(arpop_values, "Unknown (%u)", op)));
|
|
|
|
switch (op) {
|
|
|
|
case ARPOP_REQUEST:
|
|
ND_PRINT((ndo, "who-has %s", ipaddr_string(ndo, ATMTPA(ap))));
|
|
if (ATMTHRD_LEN(ap) != 0) {
|
|
ND_PRINT((ndo, " ("));
|
|
atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap),
|
|
ATMTSA(ap), ATMTSLN(ap));
|
|
ND_PRINT((ndo, ")"));
|
|
}
|
|
ND_PRINT((ndo, "tell %s", ipaddr_string(ndo, ATMSPA(ap))));
|
|
break;
|
|
|
|
case ARPOP_REPLY:
|
|
ND_PRINT((ndo, "%s is-at ", ipaddr_string(ndo, ATMSPA(ap))));
|
|
atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),
|
|
ATMSSLN(ap));
|
|
break;
|
|
|
|
case ARPOP_INVREQUEST:
|
|
ND_PRINT((ndo, "who-is "));
|
|
atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap), ATMTSA(ap),
|
|
ATMTSLN(ap));
|
|
ND_PRINT((ndo, " tell "));
|
|
atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),
|
|
ATMSSLN(ap));
|
|
break;
|
|
|
|
case ARPOP_INVREPLY:
|
|
atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),
|
|
ATMSSLN(ap));
|
|
ND_PRINT((ndo, "at %s", ipaddr_string(ndo, ATMSPA(ap))));
|
|
break;
|
|
|
|
case ARPOP_NAK:
|
|
ND_PRINT((ndo, "for %s", ipaddr_string(ndo, ATMSPA(ap))));
|
|
break;
|
|
|
|
default:
|
|
ND_DEFAULTPRINT((const u_char *)ap, caplen);
|
|
return;
|
|
}
|
|
|
|
out:
|
|
ND_PRINT((ndo, ", length %u", length));
|
|
return;
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, "%s", tstr));
|
|
}
|
|
|
|
void
|
|
arp_print(netdissect_options *ndo,
|
|
const u_char *bp, u_int length, u_int caplen)
|
|
{
|
|
const struct arp_pkthdr *ap;
|
|
u_short pro, hrd, op, linkaddr;
|
|
|
|
ap = (const struct arp_pkthdr *)bp;
|
|
ND_TCHECK(*ap);
|
|
|
|
hrd = HRD(ap);
|
|
pro = PRO(ap);
|
|
op = OP(ap);
|
|
|
|
|
|
/* if its ATM then call the ATM ARP printer
|
|
for Frame-relay ARP most of the fields
|
|
are similar to Ethernet so overload the Ethernet Printer
|
|
and set the linkaddr type for linkaddr_string(ndo, ) accordingly */
|
|
|
|
switch(hrd) {
|
|
case ARPHRD_ATM2225:
|
|
atmarp_print(ndo, bp, length, caplen);
|
|
return;
|
|
case ARPHRD_FRELAY:
|
|
linkaddr = LINKADDR_FRELAY;
|
|
break;
|
|
default:
|
|
linkaddr = LINKADDR_ETHER;
|
|
break;
|
|
}
|
|
|
|
if (!ND_TTEST2(*ar_tpa(ap), PROTO_LEN(ap))) {
|
|
ND_PRINT((ndo, "%s", tstr));
|
|
ND_DEFAULTPRINT((const u_char *)ap, length);
|
|
return;
|
|
}
|
|
|
|
if (!ndo->ndo_eflag) {
|
|
ND_PRINT((ndo, "ARP, "));
|
|
}
|
|
|
|
/* print hardware type/len and proto type/len */
|
|
if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
|
|
PROTO_LEN(ap) != 4 ||
|
|
HRD_LEN(ap) == 0 ||
|
|
ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, "%s (len %u), %s (len %u)",
|
|
tok2str(arphrd_values, "Unknown Hardware (%u)", hrd),
|
|
HRD_LEN(ap),
|
|
tok2str(ethertype_values, "Unknown Protocol (0x%04x)", pro),
|
|
PROTO_LEN(ap)));
|
|
|
|
/* don't know know about the address formats */
|
|
if (!ndo->ndo_vflag) {
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* print operation */
|
|
ND_PRINT((ndo, "%s%s ",
|
|
ndo->ndo_vflag ? ", " : "",
|
|
tok2str(arpop_values, "Unknown (%u)", op)));
|
|
|
|
switch (op) {
|
|
|
|
case ARPOP_REQUEST:
|
|
ND_PRINT((ndo, "who-has %s", ipaddr_string(ndo, TPA(ap))));
|
|
if (memcmp((const char *)ezero, (const char *)THA(ap), HRD_LEN(ap)) != 0)
|
|
ND_PRINT((ndo, " (%s)",
|
|
linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap))));
|
|
ND_PRINT((ndo, " tell %s", ipaddr_string(ndo, SPA(ap))));
|
|
break;
|
|
|
|
case ARPOP_REPLY:
|
|
ND_PRINT((ndo, "%s is-at %s",
|
|
ipaddr_string(ndo, SPA(ap)),
|
|
linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap))));
|
|
break;
|
|
|
|
case ARPOP_REVREQUEST:
|
|
ND_PRINT((ndo, "who-is %s tell %s",
|
|
linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),
|
|
linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap))));
|
|
break;
|
|
|
|
case ARPOP_REVREPLY:
|
|
ND_PRINT((ndo, "%s at %s",
|
|
linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),
|
|
ipaddr_string(ndo, TPA(ap))));
|
|
break;
|
|
|
|
case ARPOP_INVREQUEST:
|
|
ND_PRINT((ndo, "who-is %s tell %s",
|
|
linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),
|
|
linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap))));
|
|
break;
|
|
|
|
case ARPOP_INVREPLY:
|
|
ND_PRINT((ndo,"%s at %s",
|
|
linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),
|
|
ipaddr_string(ndo, TPA(ap))));
|
|
break;
|
|
|
|
default:
|
|
ND_DEFAULTPRINT((const u_char *)ap, caplen);
|
|
return;
|
|
}
|
|
|
|
out:
|
|
ND_PRINT((ndo, ", length %u", length));
|
|
|
|
return;
|
|
trunc:
|
|
ND_PRINT((ndo, "%s", tstr));
|
|
}
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-style: bsd
|
|
* End:
|
|
*/
|
|
|