print-arp.c revision 146778
117680Spst/* 239300Sfenner * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 317680Spst * The Regents of the University of California. All rights reserved. 417680Spst * 517680Spst * Redistribution and use in source and binary forms, with or without 617680Spst * modification, are permitted provided that: (1) source code distributions 717680Spst * retain the above copyright notice and this paragraph in its entirety, (2) 817680Spst * distributions including binary code include the above copyright notice and 917680Spst * this paragraph in its entirety in the documentation or other materials 1017680Spst * provided with the distribution, and (3) all advertising materials mentioning 1117680Spst * features or use of this software display the following acknowledgement: 1217680Spst * ``This product includes software developed by the University of California, 1317680Spst * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 1417680Spst * the University nor the names of its contributors may be used to endorse 1517680Spst * or promote products derived from this software without specific prior 1617680Spst * written permission. 1717680Spst * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 1817680Spst * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 1917680Spst * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 2056896Sfenner * 2156896Sfenner * $FreeBSD: head/contrib/tcpdump/print-arp.c 146778 2005-05-29 19:09:28Z sam $ 2217680Spst */ 2317680Spst 2417680Spst#ifndef lint 25127675Sbmsstatic const char rcsid[] _U_ = 26146778Ssam "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.64 2004/04/30 16:42:14 mcr Exp $ (LBL)"; 2717680Spst#endif 2817680Spst 2956896Sfenner#ifdef HAVE_CONFIG_H 3056896Sfenner#include "config.h" 3156896Sfenner#endif 3256896Sfenner 33127675Sbms#include <tcpdump-stdinc.h> 3417680Spst 3517680Spst#include <stdio.h> 3617680Spst#include <string.h> 3717680Spst 38146778Ssam#include "netdissect.h" 3917680Spst#include "addrtoname.h" 4075118Sfenner#include "ether.h" 4117680Spst#include "ethertype.h" 4217680Spst#include "extract.h" /* must come after interface.h */ 4317680Spst 4475118Sfenner/* 4575118Sfenner * Address Resolution Protocol. 4675118Sfenner * 4775118Sfenner * See RFC 826 for protocol description. ARP packets are variable 4875118Sfenner * in size; the arphdr structure defines the fixed-length portion. 4975118Sfenner * Protocol type values are the same as those for 10 Mb/s Ethernet. 5075118Sfenner * It is followed by the variable-sized fields ar_sha, arp_spa, 5175118Sfenner * arp_tha and arp_tpa in that order, according to the lengths 5275118Sfenner * specified. Field names used correspond to RFC 826. 5375118Sfenner */ 54111729Sfennerstruct arp_pkthdr { 5575118Sfenner u_short ar_hrd; /* format of hardware address */ 5675118Sfenner#define ARPHRD_ETHER 1 /* ethernet hardware format */ 5775118Sfenner#define ARPHRD_IEEE802 6 /* token-ring hardware format */ 5898527Sfenner#define ARPHRD_ARCNET 7 /* arcnet hardware format */ 5975118Sfenner#define ARPHRD_FRELAY 15 /* frame relay hardware format */ 6098527Sfenner#define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */ 6198527Sfenner#define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */ 6275118Sfenner u_short ar_pro; /* format of protocol address */ 6375118Sfenner u_char ar_hln; /* length of hardware address */ 6475118Sfenner u_char ar_pln; /* length of protocol address */ 6575118Sfenner u_short ar_op; /* one of: */ 6675118Sfenner#define ARPOP_REQUEST 1 /* request to resolve address */ 6775118Sfenner#define ARPOP_REPLY 2 /* response to previous request */ 6875118Sfenner#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 6975118Sfenner#define ARPOP_REVREPLY 4 /* response giving protocol address */ 7075118Sfenner#define ARPOP_INVREQUEST 8 /* request to identify peer */ 7175118Sfenner#define ARPOP_INVREPLY 9 /* response identifying peer */ 7275118Sfenner/* 7375118Sfenner * The remaining fields are variable in size, 7475118Sfenner * according to the sizes above. 7575118Sfenner */ 7675118Sfenner#ifdef COMMENT_ONLY 7775118Sfenner u_char ar_sha[]; /* sender hardware address */ 7875118Sfenner u_char ar_spa[]; /* sender protocol address */ 7975118Sfenner u_char ar_tha[]; /* target hardware address */ 8075118Sfenner u_char ar_tpa[]; /* target protocol address */ 8175118Sfenner#endif 82111729Sfenner#define ar_sha(ap) (((const u_char *)((ap)+1))+0) 83111729Sfenner#define ar_spa(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln) 84111729Sfenner#define ar_tha(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln+(ap)->ar_pln) 85111729Sfenner#define ar_tpa(ap) (((const u_char *)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln) 8675118Sfenner}; 8775118Sfenner 8875118Sfenner#define ARP_HDRLEN 8 8975118Sfenner 90127675Sbms#define HRD(ap) EXTRACT_16BITS(&(ap)->ar_hrd) 9198527Sfenner#define HLN(ap) ((ap)->ar_hln) 9298527Sfenner#define PLN(ap) ((ap)->ar_pln) 93127675Sbms#define OP(ap) EXTRACT_16BITS(&(ap)->ar_op) 94127675Sbms#define PRO(ap) EXTRACT_16BITS(&(ap)->ar_pro) 9598527Sfenner#define SHA(ap) (ar_sha(ap)) 9698527Sfenner#define SPA(ap) (ar_spa(ap)) 9798527Sfenner#define THA(ap) (ar_tha(ap)) 9898527Sfenner#define TPA(ap) (ar_tpa(ap)) 9975118Sfenner 100127675Sbms/* 101127675Sbms * ATM Address Resolution Protocol. 102127675Sbms * 103127675Sbms * See RFC 2225 for protocol description. ATMARP packets are similar 104127675Sbms * to ARP packets, except that there are no length fields for the 105127675Sbms * protocol address - instead, there are type/length fields for 106127675Sbms * the ATM number and subaddress - and the hardware addresses consist 107127675Sbms * of an ATM number and an ATM subaddress. 108127675Sbms */ 109127675Sbmsstruct atmarp_pkthdr { 110127675Sbms u_short aar_hrd; /* format of hardware address */ 111127675Sbms#define ARPHRD_ATM2225 19 /* ATM (RFC 2225) */ 112127675Sbms u_short aar_pro; /* format of protocol address */ 113127675Sbms u_char aar_shtl; /* length of source ATM number */ 114127675Sbms u_char aar_sstl; /* length of source ATM subaddress */ 115127675Sbms#define ATMARP_IS_E164 0x40 /* bit in type/length for E.164 format */ 116127675Sbms#define ATMARP_LEN_MASK 0x3F /* length of {sub}address in type/length */ 117127675Sbms u_short aar_op; /* same as regular ARP */ 118127675Sbms#define ATMARPOP_NAK 10 /* NAK */ 119127675Sbms u_char aar_spln; /* length of source protocol address */ 120127675Sbms u_char aar_thtl; /* length of target ATM number */ 121127675Sbms u_char aar_tstl; /* length of target ATM subaddress */ 122127675Sbms u_char aar_tpln; /* length of target protocol address */ 123127675Sbms/* 124127675Sbms * The remaining fields are variable in size, 125127675Sbms * according to the sizes above. 126127675Sbms */ 127127675Sbms#ifdef COMMENT_ONLY 128127675Sbms u_char aar_sha[]; /* source ATM number */ 129127675Sbms u_char aar_ssa[]; /* source ATM subaddress */ 130127675Sbms u_char aar_spa[]; /* sender protocol address */ 131127675Sbms u_char aar_tha[]; /* target ATM number */ 132127675Sbms u_char aar_tsa[]; /* target ATM subaddress */ 133127675Sbms u_char aar_tpa[]; /* target protocol address */ 134127675Sbms#endif 135127675Sbms 136127675Sbms#define ATMHRD(ap) EXTRACT_16BITS(&(ap)->aar_hrd) 137127675Sbms#define ATMSHLN(ap) ((ap)->aar_shtl & ATMARP_LEN_MASK) 138127675Sbms#define ATMSSLN(ap) ((ap)->aar_sstl & ATMARP_LEN_MASK) 139127675Sbms#define ATMSPLN(ap) ((ap)->aar_spln) 140127675Sbms#define ATMOP(ap) EXTRACT_16BITS(&(ap)->aar_op) 141127675Sbms#define ATMPRO(ap) EXTRACT_16BITS(&(ap)->aar_pro) 142127675Sbms#define ATMTHLN(ap) ((ap)->aar_thtl & ATMARP_LEN_MASK) 143127675Sbms#define ATMTSLN(ap) ((ap)->aar_tstl & ATMARP_LEN_MASK) 144127675Sbms#define ATMTPLN(ap) ((ap)->aar_tpln) 145127675Sbms#define aar_sha(ap) ((const u_char *)((ap)+1)) 146127675Sbms#define aar_ssa(ap) (aar_sha(ap) + ATMSHLN(ap)) 147127675Sbms#define aar_spa(ap) (aar_ssa(ap) + ATMSSLN(ap)) 148127675Sbms#define aar_tha(ap) (aar_spa(ap) + ATMSPLN(ap)) 149127675Sbms#define aar_tsa(ap) (aar_tha(ap) + ATMTHLN(ap)) 150127675Sbms#define aar_tpa(ap) (aar_tsa(ap) + ATMTSLN(ap)) 151127675Sbms}; 152127675Sbms 153127675Sbms#define ATMSHA(ap) (aar_sha(ap)) 154127675Sbms#define ATMSSA(ap) (aar_ssa(ap)) 155127675Sbms#define ATMSPA(ap) (aar_spa(ap)) 156127675Sbms#define ATMTHA(ap) (aar_tha(ap)) 157127675Sbms#define ATMTSA(ap) (aar_tsa(ap)) 158127675Sbms#define ATMTPA(ap) (aar_tpa(ap)) 159127675Sbms 16017680Spststatic u_char ezero[6]; 16117680Spst 162127675Sbmsstatic void 163146778Ssamatmarp_addr_print(netdissect_options *ndo, 164146778Ssam const u_char *ha, u_int ha_len, const u_char *srca, 165127675Sbms u_int srca_len) 166127675Sbms{ 167127675Sbms if (ha_len == 0) 168146778Ssam ND_PRINT((ndo, "<No address>")); 169127675Sbms else { 170146778Ssam ND_PRINT((ndo, "%s", linkaddr_string(ha, ha_len))); 171146778Ssam if (srca_len != 0) 172146778Ssam ND_PRINT((ndo, ",%s", 173146778Ssam linkaddr_string(srca, srca_len))); 174127675Sbms } 175127675Sbms} 176127675Sbms 177127675Sbmsstatic void 178146778Ssamatmarp_print(netdissect_options *ndo, 179146778Ssam const u_char *bp, u_int length, u_int caplen) 180127675Sbms{ 181127675Sbms const struct atmarp_pkthdr *ap; 182127675Sbms u_short pro, hrd, op; 183127675Sbms 184127675Sbms ap = (const struct atmarp_pkthdr *)bp; 185146778Ssam ND_TCHECK(*ap); 186127675Sbms 187127675Sbms hrd = ATMHRD(ap); 188127675Sbms pro = ATMPRO(ap); 189127675Sbms op = ATMOP(ap); 190127675Sbms 191146778Ssam if (!ND_TTEST2(*aar_tpa(ap), ATMTPLN(ap))) { 192146778Ssam ND_PRINT((ndo, "truncated-atmarp")); 193146778Ssam ND_DEFAULTPRINT((const u_char *)ap, length); 194127675Sbms return; 195127675Sbms } 196127675Sbms 197127675Sbms if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) || 198127675Sbms ATMSPLN(ap) != 4 || ATMTPLN(ap) != 4) { 199146778Ssam ND_PRINT((ndo, "atmarp-#%d for proto #%d (%d/%d) hardware #%d", 200146778Ssam op, pro, ATMSPLN(ap), ATMTPLN(ap), hrd)); 201127675Sbms return; 202127675Sbms } 203127675Sbms if (pro == ETHERTYPE_TRAIL) 204146778Ssam ND_PRINT((ndo, "trailer-")); 205127675Sbms switch (op) { 206127675Sbms 207127675Sbms case ARPOP_REQUEST: 208146778Ssam ND_PRINT((ndo, "arp who-has %s", ipaddr_string(ATMTPA(ap)))); 209127675Sbms if (ATMTHLN(ap) != 0) { 210146778Ssam ND_PRINT((ndo, " (")); 211146778Ssam atmarp_addr_print(ndo, ATMTHA(ap), ATMTHLN(ap), 212127675Sbms ATMTSA(ap), ATMTSLN(ap)); 213146778Ssam ND_PRINT((ndo, ")")); 214127675Sbms } 215146778Ssam ND_PRINT((ndo, " tell %s", ipaddr_string(ATMSPA(ap)))); 216127675Sbms break; 217127675Sbms 218127675Sbms case ARPOP_REPLY: 219146778Ssam ND_PRINT((ndo, "arp reply %s", ipaddr_string(ATMSPA(ap)))); 220146778Ssam ND_PRINT((ndo, " is-at ")); 221146778Ssam atmarp_addr_print(ndo, ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap), 222127675Sbms ATMSSLN(ap)); 223127675Sbms break; 224127675Sbms 225127675Sbms case ARPOP_INVREQUEST: 226146778Ssam ND_PRINT((ndo, "invarp who-is ")); 227146778Ssam atmarp_addr_print(ndo, ATMTHA(ap), ATMTHLN(ap), ATMTSA(ap), 228127675Sbms ATMTSLN(ap)); 229146778Ssam ND_PRINT((ndo, " tell ")); 230146778Ssam atmarp_addr_print(ndo, ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap), 231127675Sbms ATMSSLN(ap)); 232127675Sbms break; 233127675Sbms 234127675Sbms case ARPOP_INVREPLY: 235146778Ssam ND_PRINT((ndo, "invarp reply ")); 236146778Ssam atmarp_addr_print(ndo, ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap), 237127675Sbms ATMSSLN(ap)); 238146778Ssam ND_PRINT((ndo, " at %s", ipaddr_string(ATMSPA(ap)))); 239127675Sbms break; 240127675Sbms 241127675Sbms case ATMARPOP_NAK: 242146778Ssam ND_PRINT((ndo, "nak reply for %s", 243146778Ssam ipaddr_string(ATMSPA(ap)))); 244127675Sbms break; 245127675Sbms 246127675Sbms default: 247146778Ssam ND_PRINT((ndo, "atmarp-#%d", op)); 248146778Ssam ND_DEFAULTPRINT((const u_char *)ap, caplen); 249127675Sbms return; 250127675Sbms } 251127675Sbms return; 252127675Sbmstrunc: 253146778Ssam ND_PRINT((ndo, "[|atmarp]")); 254127675Sbms} 255127675Sbms 25617680Spstvoid 257146778Ssamarp_print(netdissect_options *ndo, 258146778Ssam const u_char *bp, u_int length, u_int caplen) 25917680Spst{ 260111729Sfenner const struct arp_pkthdr *ap; 26198527Sfenner u_short pro, hrd, op; 26217680Spst 263111729Sfenner ap = (const struct arp_pkthdr *)bp; 264146778Ssam ND_TCHECK(*ap); 265127675Sbms hrd = HRD(ap); 266127675Sbms if (hrd == ARPHRD_ATM2225) { 267146778Ssam atmarp_print(ndo, bp, length, caplen); 268127675Sbms return; 269127675Sbms } 270127675Sbms pro = PRO(ap); 271127675Sbms op = OP(ap); 272127675Sbms 273146778Ssam if (!ND_TTEST2(*ar_tpa(ap), PLN(ap))) { 274146778Ssam ND_PRINT((ndo, "truncated-arp")); 275146778Ssam ND_DEFAULTPRINT((const u_char *)ap, length); 27617680Spst return; 27717680Spst } 27817680Spst 279127675Sbms if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) || 280127675Sbms PLN(ap) != 4 || HLN(ap) == 0) { 281146778Ssam ND_PRINT((ndo, "arp-#%d for proto #%d (%d) hardware #%d (%d)", 282146778Ssam op, pro, PLN(ap), hrd, HLN(ap))); 28317680Spst return; 28417680Spst } 28517680Spst if (pro == ETHERTYPE_TRAIL) 286146778Ssam ND_PRINT((ndo, "trailer-")); 28717680Spst switch (op) { 28817680Spst 28917680Spst case ARPOP_REQUEST: 290146778Ssam ND_PRINT((ndo, "arp who-has %s", ipaddr_string(TPA(ap)))); 29198527Sfenner if (memcmp((const char *)ezero, (const char *)THA(ap), HLN(ap)) != 0) 292146778Ssam ND_PRINT((ndo, " (%s)", 293146778Ssam linkaddr_string(THA(ap), HLN(ap)))); 294146778Ssam ND_PRINT((ndo, " tell %s", ipaddr_string(SPA(ap)))); 29517680Spst break; 29617680Spst 29717680Spst case ARPOP_REPLY: 298146778Ssam ND_PRINT((ndo, "arp reply %s", ipaddr_string(SPA(ap)))); 299146778Ssam ND_PRINT((ndo, " is-at %s", linkaddr_string(SHA(ap), HLN(ap)))); 30017680Spst break; 30117680Spst 30298527Sfenner case ARPOP_REVREQUEST: 303146778Ssam ND_PRINT((ndo, "rarp who-is %s tell %s", 304146778Ssam linkaddr_string(THA(ap), HLN(ap)), 305146778Ssam linkaddr_string(SHA(ap), HLN(ap)))); 30617680Spst break; 30717680Spst 30898527Sfenner case ARPOP_REVREPLY: 309146778Ssam ND_PRINT((ndo, "rarp reply %s at %s", 310146778Ssam linkaddr_string(THA(ap), HLN(ap)), 311146778Ssam ipaddr_string(TPA(ap)))); 31217680Spst break; 31317680Spst 314127675Sbms case ARPOP_INVREQUEST: 315146778Ssam ND_PRINT((ndo, "invarp who-is %s tell %s", 316146778Ssam linkaddr_string(THA(ap), HLN(ap)), 317146778Ssam linkaddr_string(SHA(ap), HLN(ap)))); 318127675Sbms break; 319127675Sbms 320127675Sbms case ARPOP_INVREPLY: 321146778Ssam ND_PRINT((ndo,"invarp reply %s at %s", 322146778Ssam linkaddr_string(THA(ap), HLN(ap)), 323146778Ssam ipaddr_string(TPA(ap)))); 324127675Sbms break; 325127675Sbms 32617680Spst default: 327146778Ssam ND_PRINT((ndo, "arp-#%d", op)); 328146778Ssam ND_DEFAULTPRINT((const u_char *)ap, caplen); 32917680Spst return; 33017680Spst } 33117680Spst if (hrd != ARPHRD_ETHER) 332146778Ssam ND_PRINT((ndo, " hardware #%d", hrd)); 33398527Sfenner return; 33498527Sfennertrunc: 335146778Ssam ND_PRINT((ndo, "[|arp]")); 33617680Spst} 337146778Ssam 338146778Ssam/* 339146778Ssam * Local Variables: 340146778Ssam * c-style: bsd 341146778Ssam * End: 342146778Ssam */ 343146778Ssam 344