Move tcpdump-3.9/ to tcpdump/. No need for a versioned dir.
[dragonfly.git] / contrib / tcpdump / print-ether.c
CommitLineData
c8cf0f94
PA
1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 * The Regents of the University of California. All rights reserved.
4 *
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
16 * written permission.
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.
20 */
21#ifndef lint
22static const char rcsid[] _U_ =
23 "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.95.2.6 2006/02/20 18:15:03 hannes Exp $ (LBL)";
24#endif
25
26#ifdef HAVE_CONFIG_H
27#include "config.h"
28#endif
29
30#include <tcpdump-stdinc.h>
31
32#include <stdio.h>
33#include <pcap.h>
34
35#include "interface.h"
36#include "addrtoname.h"
37#include "ethertype.h"
38
39#include "ether.h"
40
41const struct tok ethertype_values[] = {
42 { ETHERTYPE_IP, "IPv4" },
43 { ETHERTYPE_MPLS, "MPLS unicast" },
44 { ETHERTYPE_MPLS_MULTI, "MPLS multicast" },
45 { ETHERTYPE_IPV6, "IPv6" },
46 { ETHERTYPE_8021Q, "802.1Q" },
47 { ETHERTYPE_VMAN, "VMAN" },
48 { ETHERTYPE_PUP, "PUP" },
49 { ETHERTYPE_ARP, "ARP"},
50 { ETHERTYPE_REVARP, "Reverse ARP"},
51 { ETHERTYPE_NS, "NS" },
52 { ETHERTYPE_SPRITE, "Sprite" },
53 { ETHERTYPE_TRAIL, "Trail" },
54 { ETHERTYPE_MOPDL, "MOP DL" },
55 { ETHERTYPE_MOPRC, "MOP RC" },
56 { ETHERTYPE_DN, "DN" },
57 { ETHERTYPE_LAT, "LAT" },
58 { ETHERTYPE_SCA, "SCA" },
59 { ETHERTYPE_LANBRIDGE, "Lanbridge" },
60 { ETHERTYPE_DECDNS, "DEC DNS" },
61 { ETHERTYPE_DECDTS, "DEC DTS" },
62 { ETHERTYPE_VEXP, "VEXP" },
63 { ETHERTYPE_VPROD, "VPROD" },
64 { ETHERTYPE_ATALK, "Appletalk" },
65 { ETHERTYPE_AARP, "Appletalk ARP" },
66 { ETHERTYPE_IPX, "IPX" },
67 { ETHERTYPE_PPP, "PPP" },
68 { ETHERTYPE_SLOW, "Slow Protocols" },
69 { ETHERTYPE_PPPOED, "PPPoE D" },
70 { ETHERTYPE_PPPOES, "PPPoE S" },
71 { ETHERTYPE_EAPOL, "EAPOL" },
72 { ETHERTYPE_JUMBO, "Jumbo" },
73 { ETHERTYPE_LOOPBACK, "Loopback" },
74 { ETHERTYPE_ISO, "OSI" },
75 { ETHERTYPE_GRE_ISO, "GRE-OSI" },
76 { 0, NULL}
77};
78
79static inline void
80ether_hdr_print(register const u_char *bp, u_int length)
81{
82 register const struct ether_header *ep;
83 ep = (const struct ether_header *)bp;
84
85 (void)printf("%s > %s",
86 etheraddr_string(ESRC(ep)),
87 etheraddr_string(EDST(ep)));
88
89 if (!qflag) {
90 if (ntohs(ep->ether_type) <= ETHERMTU)
91 (void)printf(", 802.3");
92 else
93 (void)printf(", ethertype %s (0x%04x)",
94 tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)),
95 ntohs(ep->ether_type));
96 } else {
97 if (ntohs(ep->ether_type) <= ETHERMTU)
98 (void)printf(", 802.3");
99 else
100 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type)));
101 }
102
103 (void)printf(", length %u: ", length);
104}
105
106void
107ether_print(const u_char *p, u_int length, u_int caplen)
108{
109 struct ether_header *ep;
110 u_short ether_type;
111 u_short extracted_ether_type;
112
113 if (caplen < ETHER_HDRLEN) {
114 printf("[|ether]");
115 return;
116 }
117
118 if (eflag)
119 ether_hdr_print(p, length);
120
121 length -= ETHER_HDRLEN;
122 caplen -= ETHER_HDRLEN;
123 ep = (struct ether_header *)p;
124 p += ETHER_HDRLEN;
125
126 ether_type = ntohs(ep->ether_type);
127
128 /*
129 * Is it (gag) an 802.3 encapsulation?
130 */
131 if (ether_type <= ETHERMTU) {
132 /* Try to print the LLC-layer header & higher layers */
133 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
134 &extracted_ether_type) == 0) {
135 /* ether_type not known, print raw packet */
136 if (!eflag)
137 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
138
139 if (!suppress_default_print)
140 default_print(p, caplen);
141 }
142 } else if (ether_encap_print(ether_type, p, length, caplen,
143 &extracted_ether_type) == 0) {
144 /* ether_type not known, print raw packet */
145 if (!eflag)
146 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
147
148 if (!suppress_default_print)
149 default_print(p, caplen);
150 }
151}
152
153/*
154 * This is the top level routine of the printer. 'p' points
155 * to the ether header of the packet, 'h->ts' is the timestamp,
156 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
157 * is the number of bytes actually captured.
158 */
159u_int
160ether_if_print(const struct pcap_pkthdr *h, const u_char *p)
161{
162 ether_print(p, h->len, h->caplen);
163
164 return (ETHER_HDRLEN);
165}
166
167/*
168 * Prints the packet encapsulated in an Ethernet data segment
169 * (or an equivalent encapsulation), given the Ethernet type code.
170 *
171 * Returns non-zero if it can do so, zero if the ethertype is unknown.
172 *
173 * The Ethernet type code is passed through a pointer; if it was
174 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of
175 * the 802.1Q payload, for the benefit of lower layers that might
176 * want to know what it is.
177 */
178
179int
180ether_encap_print(u_short ether_type, const u_char *p,
181 u_int length, u_int caplen, u_short *extracted_ether_type)
182{
183 recurse:
184 *extracted_ether_type = ether_type;
185
186 switch (ether_type) {
187
188 case ETHERTYPE_IP:
189 ip_print(gndo, p, length);
190 return (1);
191
192#ifdef INET6
193 case ETHERTYPE_IPV6:
194 ip6_print(p, length);
195 return (1);
196#endif /*INET6*/
197
198 case ETHERTYPE_ARP:
199 case ETHERTYPE_REVARP:
200 arp_print(gndo, p, length, caplen);
201 return (1);
202
203 case ETHERTYPE_DN:
204 decnet_print(p, length, caplen);
205 return (1);
206
207 case ETHERTYPE_ATALK:
208 if (vflag)
209 fputs("et1 ", stdout);
210 atalk_print(p, length);
211 return (1);
212
213 case ETHERTYPE_AARP:
214 aarp_print(p, length);
215 return (1);
216
217 case ETHERTYPE_IPX:
218 printf("(NOV-ETHII) ");
219 ipx_print(p, length);
220 return (1);
221
222 case ETHERTYPE_8021Q:
223 if (eflag)
224 printf("vlan %u, p %u%s, ",
225 ntohs(*(u_int16_t *)p) & 0xfff,
226 ntohs(*(u_int16_t *)p) >> 13,
227 (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : "");
228
229 ether_type = ntohs(*(u_int16_t *)(p + 2));
230 p += 4;
231 length -= 4;
232 caplen -= 4;
233
234 if (ether_type > ETHERMTU) {
235 if (eflag)
236 printf("ethertype %s, ",
237 tok2str(ethertype_values,"0x%04x", ether_type));
238 goto recurse;
239 }
240
241 *extracted_ether_type = 0;
242
243 if (llc_print(p, length, caplen, p - 18, p - 12,
244 extracted_ether_type) == 0) {
245 ether_hdr_print(p - 18, length + 4);
246
247 if (!suppress_default_print) {
248 default_print(p - 18, caplen + 4);
249 }
250 }
251
252
253 return (1);
254
255 case ETHERTYPE_JUMBO:
256 ether_type = ntohs(*(u_int16_t *)(p));
257 p += 2;
258 length -= 2;
259 caplen -= 2;
260
261 if (ether_type > ETHERMTU) {
262 if (eflag)
263 printf("ethertype %s, ",
264 tok2str(ethertype_values,"0x%04x", ether_type));
265 goto recurse;
266 }
267
268 *extracted_ether_type = 0;
269
270 if (llc_print(p, length, caplen, p - 16, p - 10,
271 extracted_ether_type) == 0) {
272 ether_hdr_print(p - 16, length + 2);
273
274 if (!suppress_default_print) {
275 default_print(p - 16, caplen + 2);
276 }
277 }
278
279 return (1);
280
281 case ETHERTYPE_ISO:
282 isoclns_print(p+1, length-1, length-1);
283 return(1);
284
285 case ETHERTYPE_PPPOED:
286 case ETHERTYPE_PPPOES:
287 pppoe_print(p, length);
288 return (1);
289
290 case ETHERTYPE_EAPOL:
291 eap_print(gndo, p, length);
292 return (1);
293
294 case ETHERTYPE_PPP:
295 if (length) {
296 printf(": ");
297 ppp_print(p, length);
298 }
299 return (1);
300
301 case ETHERTYPE_SLOW:
302 slow_print(p, length);
303 return (1);
304
305 case ETHERTYPE_LOOPBACK:
306 return (1);
307
308 case ETHERTYPE_MPLS:
309 case ETHERTYPE_MPLS_MULTI:
310 mpls_print(p, length);
311 return (1);
312
313 case ETHERTYPE_LAT:
314 case ETHERTYPE_SCA:
315 case ETHERTYPE_MOPRC:
316 case ETHERTYPE_MOPDL:
317 /* default_print for now */
318 default:
319 return (0);
320 }
321}
322
323
324/*
325 * Local Variables:
326 * c-style: whitesmith
327 * c-basic-offset: 8
328 * End:
329 */
330