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.
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 static const char rcsid[] _U_ =
25 "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.82.2.3 2003/12/29 22:42:21 hannes Exp $ (LBL)";
32 #include <tcpdump-stdinc.h>
37 #include "interface.h"
38 #include "addrtoname.h"
39 #include "ethertype.h"
43 const u_char *snapend;
45 const struct tok ethertype_values[] = {
46 { ETHERTYPE_IP, "IPv4" },
47 { ETHERTYPE_MPLS, "MPLS unicast" },
48 { ETHERTYPE_MPLS_MULTI, "MPLS multicast" },
49 { ETHERTYPE_IPV6, "IPv6" },
50 { ETHERTYPE_8021Q, "802.1Q" },
51 { ETHERTYPE_VMAN, "VMAN" },
52 { ETHERTYPE_PUP, "PUP" },
53 { ETHERTYPE_ARP, "ARP"},
54 { ETHERTYPE_REVARP , "Reverse ARP"},
55 { ETHERTYPE_NS, "NS" },
56 { ETHERTYPE_SPRITE, "Sprite" },
57 { ETHERTYPE_TRAIL, "Trail" },
58 { ETHERTYPE_MOPDL, "MOP DL" },
59 { ETHERTYPE_MOPRC, "MOP RC" },
60 { ETHERTYPE_DN, "DN" },
61 { ETHERTYPE_LAT, "LAT" },
62 { ETHERTYPE_SCA, "SCA" },
63 { ETHERTYPE_LANBRIDGE, "Lanbridge" },
64 { ETHERTYPE_DECDNS, "DEC DNS" },
65 { ETHERTYPE_DECDTS, "DEC DTS" },
66 { ETHERTYPE_VEXP, "VEXP" },
67 { ETHERTYPE_VPROD, "VPROD" },
68 { ETHERTYPE_ATALK, "Appletalk" },
69 { ETHERTYPE_AARP, "Appletalk ARP" },
70 { ETHERTYPE_IPX, "IPX" },
71 { ETHERTYPE_PPP, "PPP" },
72 { ETHERTYPE_PPPOED, "PPPoE D" },
73 { ETHERTYPE_PPPOES, "PPPoE S" },
74 { ETHERTYPE_LOOPBACK, "Loopback" },
79 ether_hdr_print(register const u_char *bp, u_int length)
81 register const struct ether_header *ep;
82 ep = (const struct ether_header *)bp;
84 (void)printf("%s > %s",
85 etheraddr_string(ESRC(ep)),
86 etheraddr_string(EDST(ep)));
89 if (ntohs(ep->ether_type) <= ETHERMTU)
90 (void)printf(", 802.3");
92 (void)printf(", ethertype %s (0x%04x)",
93 tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)),
94 ntohs(ep->ether_type));
96 if (ntohs(ep->ether_type) <= ETHERMTU)
97 (void)printf(", 802.3");
99 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type)));
102 (void)printf(", length %u: ", length);
106 ether_print(const u_char *p, u_int length, u_int caplen)
108 struct ether_header *ep;
110 u_short extracted_ether_type;
112 if (caplen < ETHER_HDRLEN) {
118 ether_hdr_print(p, length);
120 length -= ETHER_HDRLEN;
121 caplen -= ETHER_HDRLEN;
122 ep = (struct ether_header *)p;
125 ether_type = ntohs(ep->ether_type);
128 * Is it (gag) an 802.3 encapsulation?
130 extracted_ether_type = 0;
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 */
137 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
139 if (!xflag && !qflag)
140 default_print(p, caplen);
142 } else if (ether_encap_print(ether_type, p, length, caplen,
143 &extracted_ether_type) == 0) {
144 /* ether_type not known, print raw packet */
146 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
148 if (!xflag && !qflag)
149 default_print(p, caplen);
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->length' is the length of the packet off the wire, and 'h->caplen'
157 * is the number of bytes actually captured.
160 ether_if_print(const struct pcap_pkthdr *h, const u_char *p)
162 ether_print(p, h->len, h->caplen);
164 return (ETHER_HDRLEN);
168 * Prints the packet encapsulated in an Ethernet data segment
169 * (or an equivalent encapsulation), given the Ethernet type code.
171 * Returns non-zero if it can do so, zero if the ethertype is unknown.
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.
180 ether_encap_print(u_short ether_type, const u_char *p,
181 u_int length, u_int caplen, u_short *extracted_ether_type)
184 *extracted_ether_type = ether_type;
186 switch (ether_type) {
194 ip6_print(p, length);
199 case ETHERTYPE_REVARP:
200 arp_print(p, length, caplen);
204 decnet_print(p, length, caplen);
207 case ETHERTYPE_ATALK:
209 fputs("et1 ", stdout);
210 atalk_print(p, length);
214 aarp_print(p, length);
218 printf("(NOV-ETHII) ");
219 ipx_print(p, length);
222 case ETHERTYPE_8021Q:
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" : "");
229 ether_type = ntohs(*(u_int16_t *)(p + 2));
234 if (ether_type > ETHERMTU) {
236 printf("ethertype %s, ",
237 tok2str(ethertype_values,"0x%04x", ether_type));
241 *extracted_ether_type = 0;
243 if (llc_print(p, length, caplen, p - 18, p - 12,
244 extracted_ether_type) == 0) {
245 ether_hdr_print(p - 18, length + 4);
248 if (!xflag && !qflag)
249 default_print(p - 18, caplen + 4);
253 case ETHERTYPE_PPPOED:
254 case ETHERTYPE_PPPOES:
255 case ETHERTYPE_PPPOED2:
256 case ETHERTYPE_PPPOES2:
257 pppoe_print(p, length);
263 ppp_print(p, length);
267 case ETHERTYPE_LOOPBACK:
271 case ETHERTYPE_MPLS_MULTI:
272 mpls_print(p, length);
277 case ETHERTYPE_MOPRC:
278 case ETHERTYPE_MOPDL:
279 /* default_print for now */