/* $OpenBSD: print-ether.c,v 1.17 2001/02/05 15:18:47 jason Exp $ */ /* * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 * 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[] = "@(#) $Header: /cvs/OpenBSD/src/usr.sbin/tcpdump/print-ether.c,v 1.17 2001/02/05 15:18:47 jason Exp $ (LBL)"; #endif #include #include #include #ifdef __STDC__ struct mbuf; struct rtentry; #endif #include #include #include #include #include #include #include #include #include #include #include #ifdef INET6 #include #endif #include "interface.h" #include "addrtoname.h" #include "ethertype.h" const u_char *packetp; const u_char *snapend; 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); } u_short extracted_ethertype; /* * This is the top level routine of the printer. 'p' is the points * to the ether header of the packet, 'tvp' is the timestamp, * 'length' is the length of the packet off the wire, and '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; ts_print(&h->ts); if (caplen < sizeof(struct ether_header)) { 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 -= sizeof(struct ether_header); caplen -= sizeof(struct ether_header); ep = (struct ether_header *)p; p += sizeof(struct ether_header); 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)) == 0) { /* ether_type not known, print raw packet */ if (!eflag) ether_print((u_char *)ep, length); 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) == 0) { /* ether_type not known, print raw packet */ if (!eflag) ether_print((u_char *)ep, length + sizeof(*ep)); if (!xflag && !qflag) default_print(p, caplen); } if (xflag) default_print(p, caplen); out: putchar('\n'); } /* * 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. * * Stuffs the ether type into a global 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) { 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_llap(p, length); return (1); case ETHERTYPE_AARP: aarp_print(p, length); return (1); case ETHERTYPE_8021Q: printf("802.1Q vid %d pri %d%s", ntohs(*(unsigned short*)p)&0xFFF, ntohs(*(unsigned short*)p)>>13, (ntohs(*(unsigned short*)p)&0x1000) ? " cfi " : " "); ethertype = ntohs(*(unsigned short*)(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) == 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); #ifdef PPP case ETHERTYPE_PPPOEDISC: case ETHERTYPE_PPPOE: pppoe_if_print(ethertype, p, length, caplen); return (1); #endif case ETHERTYPE_LAT: case ETHERTYPE_SCA: case ETHERTYPE_MOPRC: case ETHERTYPE_MOPDL: /* default_print for now */ default: return (0); } }