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 #include <sys/cdefs.h> 22 #ifndef lint 23 #if 0 24 static const char rcsid[] _U_ = 25 "@(#) Header: /tcpdump/master/tcpdump/print-sll.c,v 1.19 2005-11-13 12:12:43 guy Exp (LBL)"; 26 #else 27 __RCSID("$NetBSD: print-sll.c,v 1.2 2010/12/05 05:11:30 christos Exp $"); 28 #endif 29 #endif 30 31 #ifdef HAVE_CONFIG_H 32 #include "config.h" 33 #endif 34 35 #include <tcpdump-stdinc.h> 36 37 #include <stdio.h> 38 #include <string.h> 39 #include <pcap.h> 40 41 #include "interface.h" 42 #include "addrtoname.h" 43 #include "ethertype.h" 44 #include "extract.h" 45 46 #include "ether.h" 47 #include "sll.h" 48 49 const struct tok sll_pkttype_values[] = { 50 { LINUX_SLL_HOST, "In" }, 51 { LINUX_SLL_BROADCAST, "B" }, 52 { LINUX_SLL_MULTICAST, "M" }, 53 { LINUX_SLL_OTHERHOST, "P" }, 54 { LINUX_SLL_OUTGOING, "Out" }, 55 { 0, NULL} 56 }; 57 58 static inline void 59 sll_print(register const struct sll_header *sllp, u_int length) 60 { 61 u_short ether_type; 62 63 printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype))); 64 65 /* 66 * XXX - check the link-layer address type value? 67 * For now, we just assume 6 means Ethernet. 68 * XXX - print others as strings of hex? 69 */ 70 if (EXTRACT_16BITS(&sllp->sll_halen) == 6) 71 (void)printf("%s ", etheraddr_string(sllp->sll_addr)); 72 73 if (!qflag) { 74 ether_type = EXTRACT_16BITS(&sllp->sll_protocol); 75 76 if (ether_type <= ETHERMTU) { 77 /* 78 * Not an Ethernet type; what type is it? 79 */ 80 switch (ether_type) { 81 82 case LINUX_SLL_P_802_3: 83 /* 84 * Ethernet_802.3 IPX frame. 85 */ 86 (void)printf("802.3"); 87 break; 88 89 case LINUX_SLL_P_802_2: 90 /* 91 * 802.2. 92 */ 93 (void)printf("802.2"); 94 break; 95 96 default: 97 /* 98 * What is it? 99 */ 100 (void)printf("ethertype Unknown (0x%04x)", 101 ether_type); 102 break; 103 } 104 } else { 105 (void)printf("ethertype %s (0x%04x)", 106 tok2str(ethertype_values, "Unknown", ether_type), 107 ether_type); 108 } 109 (void)printf(", length %u: ", length); 110 } 111 } 112 113 /* 114 * This is the top level routine of the printer. 'p' points to the 115 * Linux "cooked capture" header of the packet, 'h->ts' is the timestamp, 116 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 117 * is the number of bytes actually captured. 118 */ 119 u_int 120 sll_if_print(const struct pcap_pkthdr *h, const u_char *p) 121 { 122 u_int caplen = h->caplen; 123 u_int length = h->len; 124 register const struct sll_header *sllp; 125 u_short ether_type; 126 u_short extracted_ethertype; 127 128 if (caplen < SLL_HDR_LEN) { 129 /* 130 * XXX - this "can't happen" because "pcap-linux.c" always 131 * adds this many bytes of header to every packet in a 132 * cooked socket capture. 133 */ 134 printf("[|sll]"); 135 return (caplen); 136 } 137 138 sllp = (const struct sll_header *)p; 139 140 if (eflag) 141 sll_print(sllp, length); 142 143 /* 144 * Go past the cooked-mode header. 145 */ 146 length -= SLL_HDR_LEN; 147 caplen -= SLL_HDR_LEN; 148 p += SLL_HDR_LEN; 149 150 ether_type = EXTRACT_16BITS(&sllp->sll_protocol); 151 152 recurse: 153 /* 154 * Is it (gag) an 802.3 encapsulation, or some non-Ethernet 155 * packet type? 156 */ 157 if (ether_type <= ETHERMTU) { 158 /* 159 * Yes - what type is it? 160 */ 161 switch (ether_type) { 162 163 case LINUX_SLL_P_802_3: 164 /* 165 * Ethernet_802.3 IPX frame. 166 */ 167 ipx_print(p, length); 168 break; 169 170 case LINUX_SLL_P_802_2: 171 /* 172 * 802.2. 173 * Try to print the LLC-layer header & higher layers. 174 */ 175 if (llc_print(p, length, caplen, NULL, NULL, 176 &extracted_ethertype) == 0) 177 goto unknown; /* unknown LLC type */ 178 break; 179 180 default: 181 extracted_ethertype = 0; 182 /*FALLTHROUGH*/ 183 184 unknown: 185 /* ether_type not known, print raw packet */ 186 if (!eflag) 187 sll_print(sllp, length + SLL_HDR_LEN); 188 if (extracted_ethertype) { 189 printf("(LLC %s) ", 190 etherproto_string(htons(extracted_ethertype))); 191 } 192 if (!suppress_default_print) 193 default_print(p, caplen); 194 break; 195 } 196 } else if (ether_type == ETHERTYPE_8021Q) { 197 /* 198 * Print VLAN information, and then go back and process 199 * the enclosed type field. 200 */ 201 if (caplen < 4 || length < 4) { 202 printf("[|vlan]"); 203 return (SLL_HDR_LEN); 204 } 205 if (eflag) { 206 u_int16_t tag = EXTRACT_16BITS(p); 207 208 printf("vlan %u, p %u%s, ", 209 tag & 0xfff, 210 tag >> 13, 211 (tag & 0x1000) ? ", CFI" : ""); 212 } 213 214 ether_type = EXTRACT_16BITS(p + 2); 215 if (ether_type <= ETHERMTU) 216 ether_type = LINUX_SLL_P_802_2; 217 if (!qflag) { 218 (void)printf("ethertype %s, ", 219 tok2str(ethertype_values, "Unknown", ether_type)); 220 } 221 p += 4; 222 length -= 4; 223 caplen -= 4; 224 goto recurse; 225 } else { 226 if (ethertype_print(ether_type, p, length, caplen) == 0) { 227 /* ether_type not known, print raw packet */ 228 if (!eflag) 229 sll_print(sllp, length + SLL_HDR_LEN); 230 if (!suppress_default_print) 231 default_print(p, caplen); 232 } 233 } 234 235 return (SLL_HDR_LEN); 236 } 237