| /* |
| * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| #ifndef lint |
| static const char rcsid[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.95.2.6 2006/02/20 18:15:03 hannes Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include <stdio.h> |
| #include <pcap.h> |
| |
| #include "interface.h" |
| #include "addrtoname.h" |
| #include "ethertype.h" |
| |
| #include "ether.h" |
| |
| const struct tok ethertype_values[] = { |
| { ETHERTYPE_IP, "IPv4" }, |
| { ETHERTYPE_MPLS, "MPLS unicast" }, |
| { ETHERTYPE_MPLS_MULTI, "MPLS multicast" }, |
| { ETHERTYPE_IPV6, "IPv6" }, |
| { ETHERTYPE_8021Q, "802.1Q" }, |
| { ETHERTYPE_VMAN, "VMAN" }, |
| { ETHERTYPE_PUP, "PUP" }, |
| { ETHERTYPE_ARP, "ARP"}, |
| { ETHERTYPE_REVARP, "Reverse ARP"}, |
| { ETHERTYPE_NS, "NS" }, |
| { ETHERTYPE_SPRITE, "Sprite" }, |
| { ETHERTYPE_TRAIL, "Trail" }, |
| { ETHERTYPE_MOPDL, "MOP DL" }, |
| { ETHERTYPE_MOPRC, "MOP RC" }, |
| { ETHERTYPE_DN, "DN" }, |
| { ETHERTYPE_LAT, "LAT" }, |
| { ETHERTYPE_SCA, "SCA" }, |
| { ETHERTYPE_LANBRIDGE, "Lanbridge" }, |
| { ETHERTYPE_DECDNS, "DEC DNS" }, |
| { ETHERTYPE_DECDTS, "DEC DTS" }, |
| { ETHERTYPE_VEXP, "VEXP" }, |
| { ETHERTYPE_VPROD, "VPROD" }, |
| { ETHERTYPE_ATALK, "Appletalk" }, |
| { ETHERTYPE_AARP, "Appletalk ARP" }, |
| { ETHERTYPE_IPX, "IPX" }, |
| { ETHERTYPE_PPP, "PPP" }, |
| { ETHERTYPE_SLOW, "Slow Protocols" }, |
| { ETHERTYPE_PPPOED, "PPPoE D" }, |
| { ETHERTYPE_PPPOES, "PPPoE S" }, |
| { ETHERTYPE_EAPOL, "EAPOL" }, |
| { ETHERTYPE_JUMBO, "Jumbo" }, |
| { ETHERTYPE_LOOPBACK, "Loopback" }, |
| { ETHERTYPE_ISO, "OSI" }, |
| { ETHERTYPE_GRE_ISO, "GRE-OSI" }, |
| { 0, NULL} |
| }; |
| |
| static inline void |
| ether_hdr_print(register const u_char *bp, u_int length) |
| { |
| register const struct ether_header *ep; |
| ep = (const struct ether_header *)bp; |
| |
| (void)printf("%s > %s", |
| etheraddr_string(ESRC(ep)), |
| etheraddr_string(EDST(ep))); |
| |
| if (!qflag) { |
| if (ntohs(ep->ether_type) <= ETHERMTU) |
| (void)printf(", 802.3"); |
| else |
| (void)printf(", ethertype %s (0x%04x)", |
| tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)), |
| ntohs(ep->ether_type)); |
| } else { |
| if (ntohs(ep->ether_type) <= ETHERMTU) |
| (void)printf(", 802.3"); |
| else |
| (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type))); |
| } |
| |
| (void)printf(", length %u: ", length); |
| } |
| |
| void |
| ether_print(const u_char *p, u_int length, u_int caplen) |
| { |
| struct ether_header *ep; |
| u_short ether_type; |
| u_short extracted_ether_type; |
| |
| if (caplen < ETHER_HDRLEN) { |
| printf("[|ether]"); |
| return; |
| } |
| |
| if (eflag) |
| ether_hdr_print(p, length); |
| |
| length -= ETHER_HDRLEN; |
| caplen -= ETHER_HDRLEN; |
| ep = (struct ether_header *)p; |
| p += ETHER_HDRLEN; |
| |
| ether_type = ntohs(ep->ether_type); |
| |
| /* |
| * Is it (gag) an 802.3 encapsulation? |
| */ |
| if (ether_type <= ETHERMTU) { |
| /* Try to print the LLC-layer header & higher layers */ |
| if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), |
| &extracted_ether_type) == 0) { |
| /* ether_type not known, print raw packet */ |
| if (!eflag) |
| ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); |
| |
| if (!suppress_default_print) |
| default_print(p, caplen); |
| } |
| } else if (ether_encap_print(ether_type, p, length, caplen, |
| &extracted_ether_type) == 0) { |
| /* ether_type not known, print raw packet */ |
| if (!eflag) |
| ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); |
| |
| if (!suppress_default_print) |
| default_print(p, caplen); |
| } |
| } |
| |
| /* |
| * This is the top level routine of the printer. 'p' points |
| * to the ether header of the packet, 'h->ts' is the timestamp, |
| * 'h->len' is the length of the packet off the wire, and 'h->caplen' |
| * is the number of bytes actually captured. |
| */ |
| u_int |
| ether_if_print(const struct pcap_pkthdr *h, const u_char *p) |
| { |
| ether_print(p, h->len, h->caplen); |
| |
| return (ETHER_HDRLEN); |
| } |
| |
| /* |
| * Prints the packet encapsulated in an Ethernet data segment |
| * (or an equivalent encapsulation), given the Ethernet type code. |
| * |
| * Returns non-zero if it can do so, zero if the ethertype is unknown. |
| * |
| * The Ethernet type code is passed through a pointer; if it was |
| * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of |
| * the 802.1Q payload, for the benefit of lower layers that might |
| * want to know what it is. |
| */ |
| |
| int |
| ether_encap_print(u_short ether_type, const u_char *p, |
| u_int length, u_int caplen, u_short *extracted_ether_type) |
| { |
| recurse: |
| *extracted_ether_type = ether_type; |
| |
| switch (ether_type) { |
| |
| case ETHERTYPE_IP: |
| ip_print(gndo, p, length); |
| return (1); |
| |
| #ifdef INET6 |
| case ETHERTYPE_IPV6: |
| ip6_print(p, length); |
| return (1); |
| #endif /*INET6*/ |
| |
| case ETHERTYPE_ARP: |
| case ETHERTYPE_REVARP: |
| arp_print(gndo, p, length, caplen); |
| return (1); |
| |
| case ETHERTYPE_DN: |
| decnet_print(p, length, caplen); |
| return (1); |
| |
| case ETHERTYPE_ATALK: |
| if (vflag) |
| fputs("et1 ", stdout); |
| atalk_print(p, length); |
| return (1); |
| |
| case ETHERTYPE_AARP: |
| aarp_print(p, length); |
| return (1); |
| |
| case ETHERTYPE_IPX: |
| printf("(NOV-ETHII) "); |
| ipx_print(p, length); |
| return (1); |
| |
| case ETHERTYPE_8021Q: |
| if (eflag) |
| printf("vlan %u, p %u%s, ", |
| ntohs(*(u_int16_t *)p) & 0xfff, |
| ntohs(*(u_int16_t *)p) >> 13, |
| (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : ""); |
| |
| ether_type = ntohs(*(u_int16_t *)(p + 2)); |
| p += 4; |
| length -= 4; |
| caplen -= 4; |
| |
| if (ether_type > ETHERMTU) { |
| if (eflag) |
| printf("ethertype %s, ", |
| tok2str(ethertype_values,"0x%04x", ether_type)); |
| goto recurse; |
| } |
| |
| *extracted_ether_type = 0; |
| |
| if (llc_print(p, length, caplen, p - 18, p - 12, |
| extracted_ether_type) == 0) { |
| ether_hdr_print(p - 18, length + 4); |
| |
| if (!suppress_default_print) { |
| default_print(p - 18, caplen + 4); |
| } |
| } |
| |
| |
| return (1); |
| |
| case ETHERTYPE_JUMBO: |
| ether_type = ntohs(*(u_int16_t *)(p)); |
| p += 2; |
| length -= 2; |
| caplen -= 2; |
| |
| if (ether_type > ETHERMTU) { |
| if (eflag) |
| printf("ethertype %s, ", |
| tok2str(ethertype_values,"0x%04x", ether_type)); |
| goto recurse; |
| } |
| |
| *extracted_ether_type = 0; |
| |
| if (llc_print(p, length, caplen, p - 16, p - 10, |
| extracted_ether_type) == 0) { |
| ether_hdr_print(p - 16, length + 2); |
| |
| if (!suppress_default_print) { |
| default_print(p - 16, caplen + 2); |
| } |
| } |
| |
| return (1); |
| |
| case ETHERTYPE_ISO: |
| isoclns_print(p+1, length-1, length-1); |
| return(1); |
| |
| case ETHERTYPE_PPPOED: |
| case ETHERTYPE_PPPOES: |
| pppoe_print(p, length); |
| return (1); |
| |
| case ETHERTYPE_EAPOL: |
| eap_print(gndo, p, length); |
| return (1); |
| |
| case ETHERTYPE_PPP: |
| if (length) { |
| printf(": "); |
| ppp_print(p, length); |
| } |
| return (1); |
| |
| case ETHERTYPE_SLOW: |
| slow_print(p, length); |
| return (1); |
| |
| case ETHERTYPE_LOOPBACK: |
| return (1); |
| |
| case ETHERTYPE_MPLS: |
| case ETHERTYPE_MPLS_MULTI: |
| mpls_print(p, length); |
| return (1); |
| |
| case ETHERTYPE_LAT: |
| case ETHERTYPE_SCA: |
| case ETHERTYPE_MOPRC: |
| case ETHERTYPE_MOPDL: |
| /* default_print for now */ |
| default: |
| return (0); |
| } |
| } |
| |
| |
| /* |
| * Local Variables: |
| * c-style: whitesmith |
| * c-basic-offset: 8 |
| * End: |
| */ |
| |
