333 lines
10 KiB
C
333 lines
10 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.61.2.2 2003/11/16 08:51:10 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ether.h"
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#include "ethertype.h"
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#include "extract.h" /* must come after interface.h */
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/*
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* Address Resolution Protocol.
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*
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* See RFC 826 for protocol description. ARP packets are variable
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* in size; the arphdr structure defines the fixed-length portion.
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* Protocol type values are the same as those for 10 Mb/s Ethernet.
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* It is followed by the variable-sized fields ar_sha, arp_spa,
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* arp_tha and arp_tpa in that order, according to the lengths
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* specified. Field names used correspond to RFC 826.
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*/
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struct arp_pkthdr {
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u_short ar_hrd; /* format of hardware address */
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#define ARPHRD_ETHER 1 /* ethernet hardware format */
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#define ARPHRD_IEEE802 6 /* token-ring hardware format */
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#define ARPHRD_ARCNET 7 /* arcnet hardware format */
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#define ARPHRD_FRELAY 15 /* frame relay hardware format */
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#define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */
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#define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */
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u_short ar_pro; /* format of protocol address */
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u_char ar_hln; /* length of hardware address */
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u_char ar_pln; /* length of protocol address */
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u_short ar_op; /* one of: */
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#define ARPOP_REQUEST 1 /* request to resolve address */
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#define ARPOP_REPLY 2 /* response to previous request */
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#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
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#define ARPOP_REVREPLY 4 /* response giving protocol address */
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#define ARPOP_INVREQUEST 8 /* request to identify peer */
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#define ARPOP_INVREPLY 9 /* response identifying peer */
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/*
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* The remaining fields are variable in size,
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* according to the sizes above.
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*/
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#ifdef COMMENT_ONLY
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u_char ar_sha[]; /* sender hardware address */
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u_char ar_spa[]; /* sender protocol address */
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u_char ar_tha[]; /* target hardware address */
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u_char ar_tpa[]; /* target protocol address */
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#endif
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#define ar_sha(ap) (((const u_char *)((ap)+1))+0)
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#define ar_spa(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln)
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#define ar_tha(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln+(ap)->ar_pln)
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#define ar_tpa(ap) (((const u_char *)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln)
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};
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#define ARP_HDRLEN 8
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#define HRD(ap) EXTRACT_16BITS(&(ap)->ar_hrd)
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#define HLN(ap) ((ap)->ar_hln)
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#define PLN(ap) ((ap)->ar_pln)
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#define OP(ap) EXTRACT_16BITS(&(ap)->ar_op)
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#define PRO(ap) EXTRACT_16BITS(&(ap)->ar_pro)
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#define SHA(ap) (ar_sha(ap))
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#define SPA(ap) (ar_spa(ap))
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#define THA(ap) (ar_tha(ap))
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#define TPA(ap) (ar_tpa(ap))
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/*
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* ATM Address Resolution Protocol.
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*
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* See RFC 2225 for protocol description. ATMARP packets are similar
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* to ARP packets, except that there are no length fields for the
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* protocol address - instead, there are type/length fields for
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* the ATM number and subaddress - and the hardware addresses consist
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* of an ATM number and an ATM subaddress.
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*/
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struct atmarp_pkthdr {
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u_short aar_hrd; /* format of hardware address */
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#define ARPHRD_ATM2225 19 /* ATM (RFC 2225) */
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u_short aar_pro; /* format of protocol address */
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u_char aar_shtl; /* length of source ATM number */
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u_char aar_sstl; /* length of source ATM subaddress */
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#define ATMARP_IS_E164 0x40 /* bit in type/length for E.164 format */
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#define ATMARP_LEN_MASK 0x3F /* length of {sub}address in type/length */
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u_short aar_op; /* same as regular ARP */
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#define ATMARPOP_NAK 10 /* NAK */
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u_char aar_spln; /* length of source protocol address */
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u_char aar_thtl; /* length of target ATM number */
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u_char aar_tstl; /* length of target ATM subaddress */
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u_char aar_tpln; /* length of target protocol address */
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/*
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* The remaining fields are variable in size,
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* according to the sizes above.
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*/
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#ifdef COMMENT_ONLY
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u_char aar_sha[]; /* source ATM number */
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u_char aar_ssa[]; /* source ATM subaddress */
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u_char aar_spa[]; /* sender protocol address */
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u_char aar_tha[]; /* target ATM number */
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u_char aar_tsa[]; /* target ATM subaddress */
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u_char aar_tpa[]; /* target protocol address */
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#endif
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#define ATMHRD(ap) EXTRACT_16BITS(&(ap)->aar_hrd)
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#define ATMSHLN(ap) ((ap)->aar_shtl & ATMARP_LEN_MASK)
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#define ATMSSLN(ap) ((ap)->aar_sstl & ATMARP_LEN_MASK)
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#define ATMSPLN(ap) ((ap)->aar_spln)
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#define ATMOP(ap) EXTRACT_16BITS(&(ap)->aar_op)
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#define ATMPRO(ap) EXTRACT_16BITS(&(ap)->aar_pro)
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#define ATMTHLN(ap) ((ap)->aar_thtl & ATMARP_LEN_MASK)
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#define ATMTSLN(ap) ((ap)->aar_tstl & ATMARP_LEN_MASK)
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#define ATMTPLN(ap) ((ap)->aar_tpln)
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#define aar_sha(ap) ((const u_char *)((ap)+1))
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#define aar_ssa(ap) (aar_sha(ap) + ATMSHLN(ap))
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#define aar_spa(ap) (aar_ssa(ap) + ATMSSLN(ap))
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#define aar_tha(ap) (aar_spa(ap) + ATMSPLN(ap))
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#define aar_tsa(ap) (aar_tha(ap) + ATMTHLN(ap))
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#define aar_tpa(ap) (aar_tsa(ap) + ATMTSLN(ap))
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};
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#define ATMSHA(ap) (aar_sha(ap))
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#define ATMSSA(ap) (aar_ssa(ap))
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#define ATMSPA(ap) (aar_spa(ap))
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#define ATMTHA(ap) (aar_tha(ap))
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#define ATMTSA(ap) (aar_tsa(ap))
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#define ATMTPA(ap) (aar_tpa(ap))
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static u_char ezero[6];
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static void
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atmarp_addr_print(const u_char *ha, u_int ha_len, const u_char *srca,
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u_int srca_len)
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{
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if (ha_len == 0)
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(void)printf("<No address>");
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else {
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(void)printf("%s", linkaddr_string(ha, ha_len));
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if (srca_len != 0)
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(void)printf(",%s", linkaddr_string(srca, srca_len));
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}
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}
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static void
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atmarp_print(const u_char *bp, u_int length, u_int caplen)
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{
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const struct atmarp_pkthdr *ap;
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u_short pro, hrd, op;
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ap = (const struct atmarp_pkthdr *)bp;
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TCHECK(*ap);
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hrd = ATMHRD(ap);
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pro = ATMPRO(ap);
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op = ATMOP(ap);
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if (!TTEST2(*aar_tpa(ap), ATMTPLN(ap))) {
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(void)printf("truncated-atmarp");
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default_print((const u_char *)ap, length);
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return;
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}
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if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
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ATMSPLN(ap) != 4 || ATMTPLN(ap) != 4) {
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(void)printf("atmarp-#%d for proto #%d (%d/%d) hardware #%d",
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op, pro, ATMSPLN(ap), ATMTPLN(ap), hrd);
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return;
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}
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if (pro == ETHERTYPE_TRAIL)
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(void)printf("trailer-");
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switch (op) {
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case ARPOP_REQUEST:
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(void)printf("arp who-has %s", ipaddr_string(ATMTPA(ap)));
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if (ATMTHLN(ap) != 0) {
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(void)printf(" (");
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atmarp_addr_print(ATMTHA(ap), ATMTHLN(ap),
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ATMTSA(ap), ATMTSLN(ap));
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(void)printf(")");
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}
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(void)printf(" tell %s", ipaddr_string(ATMSPA(ap)));
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break;
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case ARPOP_REPLY:
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(void)printf("arp reply %s", ipaddr_string(ATMSPA(ap)));
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(void)printf(" is-at ");
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atmarp_addr_print(ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap),
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ATMSSLN(ap));
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break;
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case ARPOP_INVREQUEST:
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(void)printf("invarp who-is ");
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atmarp_addr_print(ATMTHA(ap), ATMTHLN(ap), ATMTSA(ap),
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ATMTSLN(ap));
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(void)printf(" tell ");
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atmarp_addr_print(ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap),
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ATMSSLN(ap));
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break;
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case ARPOP_INVREPLY:
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(void)printf("invarp reply ");
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atmarp_addr_print(ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap),
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ATMSSLN(ap));
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(void)printf(" at %s", ipaddr_string(ATMSPA(ap)));
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break;
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case ATMARPOP_NAK:
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(void)printf("nak reply for %s",
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ipaddr_string(ATMSPA(ap)));
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break;
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default:
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(void)printf("atmarp-#%d", op);
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default_print((const u_char *)ap, caplen);
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return;
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}
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return;
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trunc:
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(void)printf("[|atmarp]");
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}
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void
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arp_print(const u_char *bp, u_int length, u_int caplen)
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{
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const struct arp_pkthdr *ap;
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u_short pro, hrd, op;
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ap = (const struct arp_pkthdr *)bp;
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TCHECK(*ap);
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hrd = HRD(ap);
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if (hrd == ARPHRD_ATM2225) {
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atmarp_print(bp, length, caplen);
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return;
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}
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pro = PRO(ap);
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op = OP(ap);
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if (!TTEST2(*ar_tpa(ap), PLN(ap))) {
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(void)printf("truncated-arp");
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default_print((const u_char *)ap, length);
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return;
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}
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if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
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PLN(ap) != 4 || HLN(ap) == 0) {
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(void)printf("arp-#%d for proto #%d (%d) hardware #%d (%d)",
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op, pro, PLN(ap), hrd, HLN(ap));
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return;
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}
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if (pro == ETHERTYPE_TRAIL)
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(void)printf("trailer-");
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switch (op) {
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case ARPOP_REQUEST:
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(void)printf("arp who-has %s", ipaddr_string(TPA(ap)));
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if (memcmp((const char *)ezero, (const char *)THA(ap), HLN(ap)) != 0)
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(void)printf(" (%s)",
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linkaddr_string(THA(ap), HLN(ap)));
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(void)printf(" tell %s", ipaddr_string(SPA(ap)));
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break;
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case ARPOP_REPLY:
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(void)printf("arp reply %s", ipaddr_string(SPA(ap)));
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(void)printf(" is-at %s", linkaddr_string(SHA(ap), HLN(ap)));
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break;
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case ARPOP_REVREQUEST:
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(void)printf("rarp who-is %s tell %s",
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linkaddr_string(THA(ap), HLN(ap)),
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linkaddr_string(SHA(ap), HLN(ap)));
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break;
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case ARPOP_REVREPLY:
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(void)printf("rarp reply %s at %s",
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linkaddr_string(THA(ap), HLN(ap)),
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ipaddr_string(TPA(ap)));
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break;
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case ARPOP_INVREQUEST:
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(void)printf("invarp who-is %s tell %s",
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linkaddr_string(THA(ap), HLN(ap)),
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linkaddr_string(SHA(ap), HLN(ap)));
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break;
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case ARPOP_INVREPLY:
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(void)printf("invarp reply %s at %s",
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linkaddr_string(THA(ap), HLN(ap)),
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ipaddr_string(TPA(ap)));
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break;
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default:
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(void)printf("arp-#%d", op);
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default_print((const u_char *)ap, caplen);
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return;
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}
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if (hrd != ARPHRD_ETHER)
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printf(" hardware #%d", hrd);
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return;
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trunc:
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(void)printf("[|arp]");
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}
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