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.
22 static const char rcsid[] =
23 "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.65 2001/07/04 22:03:14 fenner Exp $ (LBL)";
30 #include <sys/param.h>
32 #include <sys/socket.h>
37 #include <netinet/in.h>
42 #include "interface.h"
43 #include "addrtoname.h"
44 #include "ethertype.h"
48 const u_char *packetp;
49 const u_char *snapend;
52 ether_print(register const u_char *bp, u_int length)
54 register const struct ether_header *ep;
56 ep = (const struct ether_header *)bp;
58 (void)printf("%s %s %d: ",
59 etheraddr_string(ESRC(ep)),
60 etheraddr_string(EDST(ep)),
63 (void)printf("%s %s %s %d: ",
64 etheraddr_string(ESRC(ep)),
65 etheraddr_string(EDST(ep)),
66 etherproto_string(ep->ether_type),
71 * This is the top level routine of the printer. 'p' is the points
72 * to the ether header of the packet, 'h->tv' is the timestamp,
73 * 'h->length' is the length of the packet off the wire, and 'h->caplen'
74 * is the number of bytes actually captured.
77 ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
79 u_int caplen = h->caplen;
80 u_int length = h->len;
81 struct ether_header *ep;
83 u_short extracted_ethertype;
88 if (caplen < ETHER_HDRLEN) {
94 ether_print(p, length);
97 * Some printers want to get back at the ethernet addresses,
98 * and/or check that they're not walking off the end of the packet.
99 * Rather than pass them all the way down, we set these globals.
102 snapend = p + caplen;
104 length -= ETHER_HDRLEN;
105 caplen -= ETHER_HDRLEN;
106 ep = (struct ether_header *)p;
109 ether_type = ntohs(ep->ether_type);
112 * Is it (gag) an 802.3 encapsulation?
114 extracted_ethertype = 0;
115 if (ether_type <= ETHERMTU) {
116 /* Try to print the LLC-layer header & higher layers */
117 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
118 &extracted_ethertype) == 0) {
119 /* ether_type not known, print raw packet */
121 ether_print((u_char *)ep, length + ETHER_HDRLEN);
122 if (extracted_ethertype) {
124 etherproto_string(htons(extracted_ethertype)));
126 if (!xflag && !qflag)
127 default_print(p, caplen);
129 } else if (ether_encap_print(ether_type, p, length, caplen,
130 &extracted_ethertype) == 0) {
131 /* ether_type not known, print raw packet */
133 ether_print((u_char *)ep, length + ETHER_HDRLEN);
134 if (!xflag && !qflag)
135 default_print(p, caplen);
138 default_print(p, caplen);
147 * Prints the packet encapsulated in an Ethernet data segment
148 * (or an equivalent encapsulation), given the Ethernet type code.
150 * Returns non-zero if it can do so, zero if the ethertype is unknown.
152 * The Ethernet type code is passed through a pointer; if it was
153 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of
154 * the 802.1Q payload, for the benefit of lower layers that might
155 * want to know what it is.
159 ether_encap_print(u_short ethertype, const u_char *p,
160 u_int length, u_int caplen, u_short *extracted_ethertype)
163 *extracted_ethertype = ethertype;
173 ip6_print(p, length);
178 case ETHERTYPE_REVARP:
179 arp_print(p, length, caplen);
183 decnet_print(p, length, caplen);
186 case ETHERTYPE_ATALK:
188 fputs("et1 ", stdout);
189 atalk_print(p, length);
193 aarp_print(p, length);
197 ipx_print(p, length);
200 case ETHERTYPE_8021Q:
201 printf("802.1Q vlan#%d P%d%s ",
202 ntohs(*(u_int16_t *)p) & 0xfff,
203 ntohs(*(u_int16_t *)p) >> 13,
204 (ntohs(*(u_int16_t *)p) & 0x1000) ? " CFI" : "");
205 ethertype = ntohs(*(u_int16_t *)(p + 2));
209 if (ethertype > ETHERMTU)
212 *extracted_ethertype = 0;
214 if (llc_print(p, length, caplen, p - 18, p - 12,
215 extracted_ethertype) == 0) {
216 /* ether_type not known, print raw packet */
218 ether_print(p - 18, length + 4);
219 if (*extracted_ethertype) {
221 etherproto_string(htons(*extracted_ethertype)));
223 if (!xflag && !qflag)
224 default_print(p - 18, caplen + 4);
228 case ETHERTYPE_PPPOED:
229 case ETHERTYPE_PPPOES:
230 pppoe_print(p, length);
237 ppp_print(p, length);
242 case ETHERTYPE_MPLS_MULTI:
243 mpls_print(p, length);
248 case ETHERTYPE_MOPRC:
249 case ETHERTYPE_MOPDL:
250 /* default_print for now */