/* * 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. * * $FreeBSD$ */ #ifndef lint static const char rcsid[] = "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.65.4.1 2002/06/01 23:51:12 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include #include "interface.h" #include "addrtoname.h" #include "ethertype.h" #include "ether.h" const u_char *packetp; const u_char *snapend; static inline void ether_print(register const u_char *bp, u_int length) { register const struct ether_header *ep; ep = (const struct ether_header *)bp; if (qflag) (void)printf("%s %s %d: ", etheraddr_string(ESRC(ep)), etheraddr_string(EDST(ep)), length); else (void)printf("%s %s %s %d: ", etheraddr_string(ESRC(ep)), etheraddr_string(EDST(ep)), etherproto_string(ep->ether_type), length); } /* * This is the top level routine of the printer. 'p' is the points * to the ether header of the packet, 'h->tv' is the timestamp, * 'h->length' is the length of the packet off the wire, and 'h->caplen' * is the number of bytes actually captured. */ void ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) { u_int caplen = h->caplen; u_int length = h->len; struct ether_header *ep; u_short ether_type; u_short extracted_ethertype; ++infodelay; ts_print(&h->ts); if (caplen < ETHER_HDRLEN) { printf("[|ether]"); goto out; } if (eflag) ether_print(p, length); /* * Some printers want to get back at the ethernet addresses, * and/or check that they're not walking off the end of the packet. * Rather than pass them all the way down, we set these globals. */ packetp = p; snapend = p + caplen; 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_ethertype = 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_ethertype) == 0) { /* ether_type not known, print raw packet */ if (!eflag) ether_print((u_char *)ep, length + ETHER_HDRLEN); if (extracted_ethertype) { printf("(LLC %s) ", etherproto_string(htons(extracted_ethertype))); } if (!xflag && !qflag) default_print(p, caplen); } } else if (ether_encap_print(ether_type, p, length, caplen, &extracted_ethertype) == 0) { /* ether_type not known, print raw packet */ if (!eflag) ether_print((u_char *)ep, length + ETHER_HDRLEN); if (!xflag && !qflag) default_print(p, caplen); } if (xflag) default_print(p, caplen); out: putchar('\n'); --infodelay; if (infoprint) info(0); } /* * 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 ethertype, const u_char *p, u_int length, u_int caplen, u_short *extracted_ethertype) { recurse: *extracted_ethertype = ethertype; switch (ethertype) { 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: ipx_print(p, length); return (1); case ETHERTYPE_8021Q: printf("802.1Q vlan#%d P%d%s ", ntohs(*(u_int16_t *)p) & 0xfff, ntohs(*(u_int16_t *)p) >> 13, (ntohs(*(u_int16_t *)p) & 0x1000) ? " CFI" : ""); ethertype = ntohs(*(u_int16_t *)(p + 2)); p += 4; length -= 4; caplen -= 4; if (ethertype > ETHERMTU) goto recurse; *extracted_ethertype = 0; if (llc_print(p, length, caplen, p - 18, p - 12, extracted_ethertype) == 0) { /* ether_type not known, print raw packet */ if (!eflag) ether_print(p - 18, length + 4); if (*extracted_ethertype) { printf("(LLC %s) ", etherproto_string(htons(*extracted_ethertype))); } if (!xflag && !qflag) default_print(p - 18, caplen + 4); } return (1); case ETHERTYPE_PPPOED: case ETHERTYPE_PPPOES: case ETHERTYPE_PPPOED2: case ETHERTYPE_PPPOES2: pppoe_print(p, length); return (1); case ETHERTYPE_PPP: printf("ppp"); if (length) { printf(": "); ppp_print(p, length); } 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); } }