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 static const char rcsid[] =
25 "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.61 2000/12/22 22:45:10 guy Exp $ (LBL)";
32 #include <sys/param.h>
34 #include <sys/socket.h>
39 #include <netinet/in.h>
44 #include "interface.h"
45 #include "addrtoname.h"
46 #include "ethertype.h"
50 const u_char *packetp;
51 const u_char *snapend;
54 ether_print(register const u_char *bp, u_int length)
56 register const struct ether_header *ep;
58 ep = (const struct ether_header *)bp;
60 (void)printf("%s %s %d: ",
61 etheraddr_string(ESRC(ep)),
62 etheraddr_string(EDST(ep)),
65 (void)printf("%s %s %s %d: ",
66 etheraddr_string(ESRC(ep)),
67 etheraddr_string(EDST(ep)),
68 etherproto_string(ep->ether_type),
73 * This is the top level routine of the printer. 'p' is the points
74 * to the ether header of the packet, 'h->tv' is the timestamp,
75 * 'h->length' is the length of the packet off the wire, and 'h->caplen'
76 * is the number of bytes actually captured.
79 ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
81 u_int caplen = h->caplen;
82 u_int length = h->len;
83 struct ether_header *ep;
85 u_short extracted_ethertype;
89 if (caplen < ETHER_HDRLEN) {
95 ether_print(p, length);
98 * Some printers want to get back at the ethernet addresses,
99 * and/or check that they're not walking off the end of the packet.
100 * Rather than pass them all the way down, we set these globals.
103 snapend = p + caplen;
105 length -= ETHER_HDRLEN;
106 caplen -= ETHER_HDRLEN;
107 ep = (struct ether_header *)p;
110 ether_type = ntohs(ep->ether_type);
113 * Is it (gag) an 802.3 encapsulation?
115 extracted_ethertype = 0;
116 if (ether_type <= ETHERMTU) {
117 /* Try to print the LLC-layer header & higher layers */
118 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
119 &extracted_ethertype) == 0) {
120 /* ether_type not known, print raw packet */
122 ether_print((u_char *)ep, length + ETHER_HDRLEN);
123 if (extracted_ethertype) {
125 etherproto_string(htons(extracted_ethertype)));
127 if (!xflag && !qflag)
128 default_print(p, caplen);
130 } else if (ether_encap_print(ether_type, p, length, caplen,
131 &extracted_ethertype) == 0) {
132 /* ether_type not known, print raw packet */
134 ether_print((u_char *)ep, length + ETHER_HDRLEN);
135 if (!xflag && !qflag)
136 default_print(p, caplen);
139 default_print(p, caplen);
145 * Prints the packet encapsulated in an Ethernet data segment
146 * (or an equivalent encapsulation), given the Ethernet type code.
148 * Returns non-zero if it can do so, zero if the ethertype is unknown.
150 * The Ethernet type code is passed through a pointer; if it was
151 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of
152 * the 802.1Q payload, for the benefit of lower layers that might
153 * want to know what it is.
157 ether_encap_print(u_short ethertype, const u_char *p,
158 u_int length, u_int caplen, u_short *extracted_ethertype)
161 *extracted_ethertype = ethertype;
171 ip6_print(p, length);
176 case ETHERTYPE_REVARP:
177 arp_print(p, length, caplen);
181 decnet_print(p, length, caplen);
184 case ETHERTYPE_ATALK:
186 fputs("et1 ", stdout);
187 atalk_print(p, length);
191 aarp_print(p, length);
195 ipx_print(p, length);
198 case ETHERTYPE_8021Q:
199 printf("802.1Q vlan#%d P%d%s ",
200 ntohs(*(u_int16_t *)p) & 0xfff,
201 ntohs(*(u_int16_t *)p) >> 13,
202 (ntohs(*(u_int16_t *)p) & 0x1000) ? " CFI" : "");
203 ethertype = ntohs(*(u_int16_t *)(p + 2));
207 if (ethertype > ETHERMTU)
210 *extracted_ethertype = 0;
212 if (llc_print(p, length, caplen, p - 18, p - 12,
213 extracted_ethertype) == 0) {
214 /* ether_type not known, print raw packet */
216 ether_print(p - 18, length + 4);
217 if (*extracted_ethertype) {
219 etherproto_string(htons(*extracted_ethertype)));
221 if (!xflag && !qflag)
222 default_print(p - 18, caplen + 4);
226 case ETHERTYPE_PPPOED:
227 case ETHERTYPE_PPPOES:
228 case ETHERTYPE_PPPOED2:
229 case ETHERTYPE_PPPOES2:
230 pppoe_print(p, length);
235 case ETHERTYPE_MOPRC:
236 case ETHERTYPE_MOPDL:
237 /* default_print for now */