| /* |
| * 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 1.8 2002-08-01 08:53:28 risso Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <pcap.h> |
| |
| #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); |
| } |