/* * 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 1.82.2.3 2003/12/29 22:42:21 hannes Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "interface.h" #include "addrtoname.h" #include "ethertype.h" #include "ether.h" const u_char *snapend; 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_PPPOED, "PPPoE D" }, { ETHERTYPE_PPPOES, "PPPoE S" }, { ETHERTYPE_LOOPBACK, "Loopback" }, { 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? */ extracted_ether_type = 0; 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 (!xflag && !qflag) 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 (!xflag && !qflag) 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->length' 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(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(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 (!xflag && !qflag) default_print(p - 18, caplen + 4); return (1); case ETHERTYPE_PPPOED: case ETHERTYPE_PPPOES: pppoe_print(p, length); return (1); case ETHERTYPE_PPP: if (length) { printf(": "); ppp_print(p, length); } return (1); case ETHERTYPE_LOOPBACK: return (0); 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); } }