2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
24 #define NETDISSECT_REWORKED
29 #include <tcpdump-stdinc.h>
33 #include "interface.h"
34 #include "addrtoname.h"
36 #include "ethertype.h"
37 #include "extract.h" /* must come after interface.h */
39 static const char tstr[] = "[|ARP]";
42 * Address Resolution Protocol.
44 * See RFC 826 for protocol description. ARP packets are variable
45 * in size; the arphdr structure defines the fixed-length portion.
46 * Protocol type values are the same as those for 10 Mb/s Ethernet.
47 * It is followed by the variable-sized fields ar_sha, arp_spa,
48 * arp_tha and arp_tpa in that order, according to the lengths
49 * specified. Field names used correspond to RFC 826.
52 u_short ar_hrd; /* format of hardware address */
53 #define ARPHRD_ETHER 1 /* ethernet hardware format */
54 #define ARPHRD_IEEE802 6 /* token-ring hardware format */
55 #define ARPHRD_ARCNET 7 /* arcnet hardware format */
56 #define ARPHRD_FRELAY 15 /* frame relay hardware format */
57 #define ARPHRD_ATM2225 19 /* ATM (RFC 2225) */
58 #define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */
59 #define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */
60 u_short ar_pro; /* format of protocol address */
61 u_char ar_hln; /* length of hardware address */
62 u_char ar_pln; /* length of protocol address */
63 u_short ar_op; /* one of: */
64 #define ARPOP_REQUEST 1 /* request to resolve address */
65 #define ARPOP_REPLY 2 /* response to previous request */
66 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
67 #define ARPOP_REVREPLY 4 /* response giving protocol address */
68 #define ARPOP_INVREQUEST 8 /* request to identify peer */
69 #define ARPOP_INVREPLY 9 /* response identifying peer */
70 #define ARPOP_NAK 10 /* NAK - only valif for ATM ARP */
73 * The remaining fields are variable in size,
74 * according to the sizes above.
77 u_char ar_sha[]; /* sender hardware address */
78 u_char ar_spa[]; /* sender protocol address */
79 u_char ar_tha[]; /* target hardware address */
80 u_char ar_tpa[]; /* target protocol address */
82 #define ar_sha(ap) (((const u_char *)((ap)+1))+0)
83 #define ar_spa(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln)
84 #define ar_tha(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln+(ap)->ar_pln)
85 #define ar_tpa(ap) (((const u_char *)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln)
90 #define HRD(ap) EXTRACT_16BITS(&(ap)->ar_hrd)
91 #define HRD_LEN(ap) ((ap)->ar_hln)
92 #define PROTO_LEN(ap) ((ap)->ar_pln)
93 #define OP(ap) EXTRACT_16BITS(&(ap)->ar_op)
94 #define PRO(ap) EXTRACT_16BITS(&(ap)->ar_pro)
95 #define SHA(ap) (ar_sha(ap))
96 #define SPA(ap) (ar_spa(ap))
97 #define THA(ap) (ar_tha(ap))
98 #define TPA(ap) (ar_tpa(ap))
101 static const struct tok arpop_values[] = {
102 { ARPOP_REQUEST, "Request" },
103 { ARPOP_REPLY, "Reply" },
104 { ARPOP_REVREQUEST, "Reverse Request" },
105 { ARPOP_REVREPLY, "Reverse Reply" },
106 { ARPOP_INVREQUEST, "Inverse Request" },
107 { ARPOP_INVREPLY, "Inverse Reply" },
108 { ARPOP_NAK, "NACK Reply" },
112 static const struct tok arphrd_values[] = {
113 { ARPHRD_ETHER, "Ethernet" },
114 { ARPHRD_IEEE802, "TokenRing" },
115 { ARPHRD_ARCNET, "ArcNet" },
116 { ARPHRD_FRELAY, "FrameRelay" },
117 { ARPHRD_STRIP, "Strip" },
118 { ARPHRD_IEEE1394, "IEEE 1394" },
119 { ARPHRD_ATM2225, "ATM" },
124 * ATM Address Resolution Protocol.
126 * See RFC 2225 for protocol description. ATMARP packets are similar
127 * to ARP packets, except that there are no length fields for the
128 * protocol address - instead, there are type/length fields for
129 * the ATM number and subaddress - and the hardware addresses consist
130 * of an ATM number and an ATM subaddress.
132 struct atmarp_pkthdr {
133 u_short aar_hrd; /* format of hardware address */
134 u_short aar_pro; /* format of protocol address */
135 u_char aar_shtl; /* length of source ATM number */
136 u_char aar_sstl; /* length of source ATM subaddress */
137 #define ATMARP_IS_E164 0x40 /* bit in type/length for E.164 format */
138 #define ATMARP_LEN_MASK 0x3F /* length of {sub}address in type/length */
139 u_short aar_op; /* same as regular ARP */
140 u_char aar_spln; /* length of source protocol address */
141 u_char aar_thtl; /* length of target ATM number */
142 u_char aar_tstl; /* length of target ATM subaddress */
143 u_char aar_tpln; /* length of target protocol address */
145 * The remaining fields are variable in size,
146 * according to the sizes above.
149 u_char aar_sha[]; /* source ATM number */
150 u_char aar_ssa[]; /* source ATM subaddress */
151 u_char aar_spa[]; /* sender protocol address */
152 u_char aar_tha[]; /* target ATM number */
153 u_char aar_tsa[]; /* target ATM subaddress */
154 u_char aar_tpa[]; /* target protocol address */
157 #define ATMHRD(ap) EXTRACT_16BITS(&(ap)->aar_hrd)
158 #define ATMSHRD_LEN(ap) ((ap)->aar_shtl & ATMARP_LEN_MASK)
159 #define ATMSSLN(ap) ((ap)->aar_sstl & ATMARP_LEN_MASK)
160 #define ATMSPROTO_LEN(ap) ((ap)->aar_spln)
161 #define ATMOP(ap) EXTRACT_16BITS(&(ap)->aar_op)
162 #define ATMPRO(ap) EXTRACT_16BITS(&(ap)->aar_pro)
163 #define ATMTHRD_LEN(ap) ((ap)->aar_thtl & ATMARP_LEN_MASK)
164 #define ATMTSLN(ap) ((ap)->aar_tstl & ATMARP_LEN_MASK)
165 #define ATMTPROTO_LEN(ap) ((ap)->aar_tpln)
166 #define aar_sha(ap) ((const u_char *)((ap)+1))
167 #define aar_ssa(ap) (aar_sha(ap) + ATMSHRD_LEN(ap))
168 #define aar_spa(ap) (aar_ssa(ap) + ATMSSLN(ap))
169 #define aar_tha(ap) (aar_spa(ap) + ATMSPROTO_LEN(ap))
170 #define aar_tsa(ap) (aar_tha(ap) + ATMTHRD_LEN(ap))
171 #define aar_tpa(ap) (aar_tsa(ap) + ATMTSLN(ap))
174 #define ATMSHA(ap) (aar_sha(ap))
175 #define ATMSSA(ap) (aar_ssa(ap))
176 #define ATMSPA(ap) (aar_spa(ap))
177 #define ATMTHA(ap) (aar_tha(ap))
178 #define ATMTSA(ap) (aar_tsa(ap))
179 #define ATMTPA(ap) (aar_tpa(ap))
181 static u_char ezero[6];
184 atmarp_addr_print(netdissect_options *ndo,
185 const u_char *ha, u_int ha_len, const u_char *srca,
189 ND_PRINT((ndo, "<No address>"));
191 ND_PRINT((ndo, "%s", linkaddr_string(ndo, ha, LINKADDR_ATM, ha_len)));
193 ND_PRINT((ndo, ",%s",
194 linkaddr_string(ndo, srca, LINKADDR_ATM, srca_len)));
199 atmarp_print(netdissect_options *ndo,
200 const u_char *bp, u_int length, u_int caplen)
202 const struct atmarp_pkthdr *ap;
203 u_short pro, hrd, op;
205 ap = (const struct atmarp_pkthdr *)bp;
212 if (!ND_TTEST2(*aar_tpa(ap), ATMTPROTO_LEN(ap))) {
213 ND_PRINT((ndo, "%s", tstr));
214 ND_DEFAULTPRINT((const u_char *)ap, length);
218 if (!ndo->ndo_eflag) {
219 ND_PRINT((ndo, "ARP, "));
222 if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
223 ATMSPROTO_LEN(ap) != 4 ||
224 ATMTPROTO_LEN(ap) != 4 ||
226 ND_PRINT((ndo, "%s, %s (len %u/%u)",
227 tok2str(arphrd_values, "Unknown Hardware (%u)", hrd),
228 tok2str(ethertype_values, "Unknown Protocol (0x%04x)", pro),
232 /* don't know know about the address formats */
233 if (!ndo->ndo_vflag) {
238 /* print operation */
239 ND_PRINT((ndo, "%s%s ",
240 ndo->ndo_vflag ? ", " : "",
241 tok2str(arpop_values, "Unknown (%u)", op)));
246 ND_PRINT((ndo, "who-has %s", ipaddr_string(ndo, ATMTPA(ap))));
247 if (ATMTHRD_LEN(ap) != 0) {
248 ND_PRINT((ndo, " ("));
249 atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap),
250 ATMTSA(ap), ATMTSLN(ap));
251 ND_PRINT((ndo, ")"));
253 ND_PRINT((ndo, "tell %s", ipaddr_string(ndo, ATMSPA(ap))));
257 ND_PRINT((ndo, "%s is-at ", ipaddr_string(ndo, ATMSPA(ap))));
258 atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),
262 case ARPOP_INVREQUEST:
263 ND_PRINT((ndo, "who-is "));
264 atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap), ATMTSA(ap),
266 ND_PRINT((ndo, " tell "));
267 atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),
272 atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),
274 ND_PRINT((ndo, "at %s", ipaddr_string(ndo, ATMSPA(ap))));
278 ND_PRINT((ndo, "for %s", ipaddr_string(ndo, ATMSPA(ap))));
282 ND_DEFAULTPRINT((const u_char *)ap, caplen);
287 ND_PRINT((ndo, ", length %u", length));
291 ND_PRINT((ndo, "%s", tstr));
295 arp_print(netdissect_options *ndo,
296 const u_char *bp, u_int length, u_int caplen)
298 const struct arp_pkthdr *ap;
299 u_short pro, hrd, op, linkaddr;
301 ap = (const struct arp_pkthdr *)bp;
309 /* if its ATM then call the ATM ARP printer
310 for Frame-relay ARP most of the fields
311 are similar to Ethernet so overload the Ethernet Printer
312 and set the linkaddr type for linkaddr_string(ndo, ) accordingly */
316 atmarp_print(ndo, bp, length, caplen);
319 linkaddr = LINKADDR_FRELAY;
322 linkaddr = LINKADDR_ETHER;
326 if (!ND_TTEST2(*ar_tpa(ap), PROTO_LEN(ap))) {
327 ND_PRINT((ndo, "%s", tstr));
328 ND_DEFAULTPRINT((const u_char *)ap, length);
332 if (!ndo->ndo_eflag) {
333 ND_PRINT((ndo, "ARP, "));
336 /* print hardware type/len and proto type/len */
337 if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
338 PROTO_LEN(ap) != 4 ||
341 ND_PRINT((ndo, "%s (len %u), %s (len %u)",
342 tok2str(arphrd_values, "Unknown Hardware (%u)", hrd),
344 tok2str(ethertype_values, "Unknown Protocol (0x%04x)", pro),
347 /* don't know know about the address formats */
348 if (!ndo->ndo_vflag) {
353 /* print operation */
354 ND_PRINT((ndo, "%s%s ",
355 ndo->ndo_vflag ? ", " : "",
356 tok2str(arpop_values, "Unknown (%u)", op)));
361 ND_PRINT((ndo, "who-has %s", ipaddr_string(ndo, TPA(ap))));
362 if (memcmp((const char *)ezero, (const char *)THA(ap), HRD_LEN(ap)) != 0)
363 ND_PRINT((ndo, " (%s)",
364 linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap))));
365 ND_PRINT((ndo, " tell %s", ipaddr_string(ndo, SPA(ap))));
369 ND_PRINT((ndo, "%s is-at %s",
370 ipaddr_string(ndo, SPA(ap)),
371 linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap))));
374 case ARPOP_REVREQUEST:
375 ND_PRINT((ndo, "who-is %s tell %s",
376 linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),
377 linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap))));
381 ND_PRINT((ndo, "%s at %s",
382 linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),
383 ipaddr_string(ndo, TPA(ap))));
386 case ARPOP_INVREQUEST:
387 ND_PRINT((ndo, "who-is %s tell %s",
388 linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),
389 linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap))));
393 ND_PRINT((ndo,"%s at %s",
394 linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap)),
395 ipaddr_string(ndo, SPA(ap))));
399 ND_DEFAULTPRINT((const u_char *)ap, caplen);
404 ND_PRINT((ndo, ", length %u", length));
408 ND_PRINT((ndo, "%s", tstr));