/* * 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: /tcpdump/master/tcpdump/print-sll.c,v 1.6 2001/07/05 18:54:18 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include struct mbuf; struct rtentry; #include #include #include #include #include "interface.h" #include "addrtoname.h" #include "ethertype.h" #include "ether.h" #include "sll.h" static inline void sll_print(register const struct sll_header *sllp, u_int length) { u_short halen; switch (ntohs(sllp->sll_pkttype)) { case LINUX_SLL_HOST: (void)printf("< "); break; case LINUX_SLL_BROADCAST: (void)printf("B "); break; case LINUX_SLL_MULTICAST: (void)printf("M "); break; case LINUX_SLL_OTHERHOST: (void)printf("P "); break; case LINUX_SLL_OUTGOING: (void)printf("> "); break; default: (void)printf("? "); break; } /* * XXX - check the link-layer address type value? * For now, we just assume 6 means Ethernet. * XXX - print others as strings of hex? */ halen = ntohs(sllp->sll_halen); if (halen == 6) (void)printf("%s ", etheraddr_string(sllp->sll_addr)); if (!qflag) (void)printf("%s ", etherproto_string(sllp->sll_protocol)); (void)printf("%d: ", 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 sll_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) { u_int caplen = h->caplen; u_int length = h->len; register const struct sll_header *sllp; u_short pkttype; struct ether_header ehdr; u_short ether_type; u_short extracted_ethertype; ++infodelay; ts_print(&h->ts); if (caplen < SLL_HDR_LEN) { /* * XXX - this "can't happen" because "pcap-linux.c" always * adds this many bytes of header to every packet in a * cooked socket capture. */ printf("[|sll]"); goto out; } sllp = (const struct sll_header *)p; /* * Fake up an Ethernet header for the benefit of printers that * insist on "packetp" pointing to an Ethernet header. */ pkttype = ntohs(sllp->sll_pkttype); /* The source address is in the packet header */ memcpy(ehdr.ether_shost, sllp->sll_addr, ETHER_ADDR_LEN); if (pkttype != LINUX_SLL_OUTGOING) { /* * We received this packet. * * We don't know the destination address, so * we fake it - all 0's except that the * bottommost bit of the bottommost octet * is set for a unicast packet, all 0's except * that the bottommost bit of the uppermost * octet is set for a multicast packet, all * 1's for a broadcast packet. */ if (pkttype == LINUX_SLL_BROADCAST) memset(ehdr.ether_dhost, 0xFF, ETHER_ADDR_LEN); else { memset(ehdr.ether_dhost, 0, ETHER_ADDR_LEN); if (pkttype == LINUX_SLL_MULTICAST) ehdr.ether_dhost[0] = 1; else ehdr.ether_dhost[ETHER_ADDR_LEN-1] = 1; } } else { /* * We sent this packet; we don't know whether it's * broadcast, multicast, or unicast, so just make * the destination address all 0's. */ memset(ehdr.ether_dhost, 0, ETHER_ADDR_LEN); } if (eflag) sll_print(sllp, 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. */ snapend = p + caplen; /* * Actually, the only printers that use packetp are print-arp.c * and print-bootp.c, and they assume that packetp points to an * Ethernet header. The right thing to do is to fix them to know * which link type is in use when they excavate. XXX */ packetp = (u_char *)&ehdr; length -= SLL_HDR_LEN; caplen -= SLL_HDR_LEN; p += SLL_HDR_LEN; ether_type = ntohs(sllp->sll_protocol); /* * Is it (gag) an 802.3 encapsulation, or some non-Ethernet * packet type? */ extracted_ethertype = 0; if (ether_type <= ETHERMTU) { /* * Yes - what type is it? */ switch (ether_type) { case LINUX_SLL_P_802_3: /* * Ethernet_802.3 IPX frame. */ ipx_print(p, length); break; case LINUX_SLL_P_802_2: /* * 802.2. * Try to print the LLC-layer header & higher layers. */ if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr), &extracted_ethertype) == 0) goto unknown; /* unknown LLC type */ break; default: unknown: /* ether_type not known, print raw packet */ if (!eflag) sll_print(sllp, length + SLL_HDR_LEN); if (extracted_ethertype) { printf("(LLC %s) ", etherproto_string(htons(extracted_ethertype))); } if (!xflag && !qflag) default_print(p, caplen); break; } } else if (ether_encap_print(ether_type, p, length, caplen, &extracted_ethertype) == 0) { /* ether_type not known, print raw packet */ if (!eflag) sll_print(sllp, length + SLL_HDR_LEN); if (!xflag && !qflag) default_print(p, caplen); } if (xflag) default_print(p, caplen); out: putchar('\n'); --infodelay; if (infoprint) info(0); }