| /* |
| * 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[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.19 2005-11-13 12:12:43 guy 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 "extract.h" |
| |
| #include "ether.h" |
| #include "sll.h" |
| |
| const struct tok sll_pkttype_values[] = { |
| { LINUX_SLL_HOST, "In" }, |
| { LINUX_SLL_BROADCAST, "B" }, |
| { LINUX_SLL_MULTICAST, "M" }, |
| { LINUX_SLL_OTHERHOST, "P" }, |
| { LINUX_SLL_OUTGOING, "Out" }, |
| { 0, NULL} |
| }; |
| |
| static inline void |
| sll_print(register const struct sll_header *sllp, u_int length) |
| { |
| u_short ether_type; |
| |
| printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype))); |
| |
| /* |
| * XXX - check the link-layer address type value? |
| * For now, we just assume 6 means Ethernet. |
| * XXX - print others as strings of hex? |
| */ |
| if (EXTRACT_16BITS(&sllp->sll_halen) == 6) |
| (void)printf("%s ", etheraddr_string(sllp->sll_addr)); |
| |
| if (!qflag) { |
| ether_type = EXTRACT_16BITS(&sllp->sll_protocol); |
| |
| if (ether_type <= ETHERMTU) { |
| /* |
| * Not an Ethernet type; what type is it? |
| */ |
| switch (ether_type) { |
| |
| case LINUX_SLL_P_802_3: |
| /* |
| * Ethernet_802.3 IPX frame. |
| */ |
| (void)printf("802.3"); |
| break; |
| |
| case LINUX_SLL_P_802_2: |
| /* |
| * 802.2. |
| */ |
| (void)printf("802.2"); |
| break; |
| |
| default: |
| /* |
| * What is it? |
| */ |
| (void)printf("ethertype Unknown (0x%04x)", |
| ether_type); |
| break; |
| } |
| } else { |
| (void)printf("ethertype %s (0x%04x)", |
| tok2str(ethertype_values, "Unknown", ether_type), |
| ether_type); |
| } |
| (void)printf(", length %u: ", length); |
| } |
| } |
| |
| /* |
| * This is the top level routine of the printer. 'p' points to the |
| * Linux "cooked capture" header of the packet, 'h->ts' is the timestamp, |
| * 'h->len' is the length of the packet off the wire, and 'h->caplen' |
| * is the number of bytes actually captured. |
| */ |
| u_int |
| sll_if_print(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 ether_type; |
| u_short extracted_ethertype; |
| |
| 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]"); |
| return (caplen); |
| } |
| |
| sllp = (const struct sll_header *)p; |
| |
| if (eflag) |
| sll_print(sllp, length); |
| |
| /* |
| * Go past the cooked-mode header. |
| */ |
| length -= SLL_HDR_LEN; |
| caplen -= SLL_HDR_LEN; |
| p += SLL_HDR_LEN; |
| |
| ether_type = EXTRACT_16BITS(&sllp->sll_protocol); |
| |
| recurse: |
| /* |
| * Is it (gag) an 802.3 encapsulation, or some non-Ethernet |
| * packet type? |
| */ |
| 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, NULL, NULL, |
| &extracted_ethertype) == 0) |
| goto unknown; /* unknown LLC type */ |
| break; |
| |
| default: |
| extracted_ethertype = 0; |
| /*FALLTHROUGH*/ |
| |
| 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 (!suppress_default_print) |
| default_print(p, caplen); |
| break; |
| } |
| } else if (ether_type == ETHERTYPE_8021Q) { |
| /* |
| * Print VLAN information, and then go back and process |
| * the enclosed type field. |
| */ |
| if (caplen < 4 || length < 4) { |
| printf("[|vlan]"); |
| return (SLL_HDR_LEN); |
| } |
| if (eflag) { |
| u_int16_t tag = EXTRACT_16BITS(p); |
| |
| printf("vlan %u, p %u%s, ", |
| tag & 0xfff, |
| tag >> 13, |
| (tag & 0x1000) ? ", CFI" : ""); |
| } |
| |
| ether_type = EXTRACT_16BITS(p + 2); |
| if (ether_type <= ETHERMTU) |
| ether_type = LINUX_SLL_P_802_2; |
| if (!qflag) { |
| (void)printf("ethertype %s, ", |
| tok2str(ethertype_values, "Unknown", ether_type)); |
| } |
| p += 4; |
| length -= 4; |
| caplen -= 4; |
| goto recurse; |
| } else { |
| if (ethertype_print(gndo, ether_type, p, length, caplen) == 0) { |
| /* ether_type not known, print raw packet */ |
| if (!eflag) |
| sll_print(sllp, length + SLL_HDR_LEN); |
| if (!suppress_default_print) |
| default_print(p, caplen); |
| } |
| } |
| |
| return (SLL_HDR_LEN); |
| } |