1 /* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 #ifndef lint 22 static const char rcsid[] _U_ = 23 "@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.16 2004/10/28 00:34:29 hannes Exp $ (LBL)"; 24 #endif 25 26 #ifdef HAVE_CONFIG_H 27 #include "config.h" 28 #endif 29 30 #include <tcpdump-stdinc.h> 31 32 #include <stdio.h> 33 #include <string.h> 34 #include <pcap.h> 35 36 #include "interface.h" 37 #include "addrtoname.h" 38 #include "ethertype.h" 39 #include "extract.h" 40 41 #include "ether.h" 42 #include "sll.h" 43 44 const struct tok sll_pkttype_values[] = { 45 { LINUX_SLL_HOST, "In" }, 46 { LINUX_SLL_BROADCAST, "B" }, 47 { LINUX_SLL_MULTICAST, "M" }, 48 { LINUX_SLL_OTHERHOST, "P" }, 49 { LINUX_SLL_OUTGOING, "Out" }, 50 { 0, NULL} 51 }; 52 53 static inline void 54 sll_print(register const struct sll_header *sllp, u_int length) 55 { 56 printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype))); 57 58 /* 59 * XXX - check the link-layer address type value? 60 * For now, we just assume 6 means Ethernet. 61 * XXX - print others as strings of hex? 62 */ 63 if (EXTRACT_16BITS(&sllp->sll_halen) == 6) 64 (void)printf("%s ", etheraddr_string(sllp->sll_addr)); 65 66 if (!qflag) 67 (void)printf("ethertype %s (0x%04x), length %u: ", 68 tok2str(ethertype_values,"Unknown", EXTRACT_16BITS(&sllp->sll_protocol)), 69 EXTRACT_16BITS(&sllp->sll_protocol), 70 length); 71 } 72 73 /* 74 * This is the top level routine of the printer. 'p' points to the 75 * Linux "cooked capture" header of the packet, 'h->ts' is the timestamp, 76 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 77 * is the number of bytes actually captured. 78 */ 79 u_int 80 sll_if_print(const struct pcap_pkthdr *h, const u_char *p) 81 { 82 u_int caplen = h->caplen; 83 u_int length = h->len; 84 register const struct sll_header *sllp; 85 u_short ether_type; 86 u_short extracted_ethertype; 87 88 if (caplen < SLL_HDR_LEN) { 89 /* 90 * XXX - this "can't happen" because "pcap-linux.c" always 91 * adds this many bytes of header to every packet in a 92 * cooked socket capture. 93 */ 94 printf("[|sll]"); 95 return (caplen); 96 } 97 98 sllp = (const struct sll_header *)p; 99 100 if (eflag) 101 sll_print(sllp, length); 102 103 /* 104 * Go past the cooked-mode header. 105 */ 106 length -= SLL_HDR_LEN; 107 caplen -= SLL_HDR_LEN; 108 p += SLL_HDR_LEN; 109 110 ether_type = ntohs(sllp->sll_protocol); 111 112 /* 113 * Is it (gag) an 802.3 encapsulation, or some non-Ethernet 114 * packet type? 115 */ 116 extracted_ethertype = 0; 117 if (ether_type <= ETHERMTU) { 118 /* 119 * Yes - what type is it? 120 */ 121 switch (ether_type) { 122 123 case LINUX_SLL_P_802_3: 124 /* 125 * Ethernet_802.3 IPX frame. 126 */ 127 ipx_print(p, length); 128 break; 129 130 case LINUX_SLL_P_802_2: 131 /* 132 * 802.2. 133 * Try to print the LLC-layer header & higher layers. 134 */ 135 if (llc_print(p, length, caplen, NULL, NULL, 136 &extracted_ethertype) == 0) 137 goto unknown; /* unknown LLC type */ 138 break; 139 140 default: 141 unknown: 142 /* ether_type not known, print raw packet */ 143 if (!eflag) 144 sll_print(sllp, length + SLL_HDR_LEN); 145 if (extracted_ethertype) { 146 printf("(LLC %s) ", 147 etherproto_string(htons(extracted_ethertype))); 148 } 149 if (!xflag && !qflag) 150 default_print(p, caplen); 151 break; 152 } 153 } else if (ether_encap_print(ether_type, p, length, caplen, 154 &extracted_ethertype) == 0) { 155 /* ether_type not known, print raw packet */ 156 if (!eflag) 157 sll_print(sllp, length + SLL_HDR_LEN); 158 if (!xflag && !qflag) 159 default_print(p, caplen); 160 } 161 162 return (SLL_HDR_LEN); 163 } 164