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 1.12.2.2 2003/11/16 08:51:44 guy 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 40 #include "ether.h" 41 #include "sll.h" 42 43 static inline void 44 sll_print(register const struct sll_header *sllp, u_int length) 45 { 46 u_short halen; 47 48 switch (ntohs(sllp->sll_pkttype)) { 49 50 case LINUX_SLL_HOST: 51 (void)printf("< "); 52 break; 53 54 case LINUX_SLL_BROADCAST: 55 (void)printf("B "); 56 break; 57 58 case LINUX_SLL_MULTICAST: 59 (void)printf("M "); 60 break; 61 62 case LINUX_SLL_OTHERHOST: 63 (void)printf("P "); 64 break; 65 66 case LINUX_SLL_OUTGOING: 67 (void)printf("> "); 68 break; 69 70 default: 71 (void)printf("? "); 72 break; 73 } 74 75 /* 76 * XXX - check the link-layer address type value? 77 * For now, we just assume 6 means Ethernet. 78 * XXX - print others as strings of hex? 79 */ 80 halen = ntohs(sllp->sll_halen); 81 if (halen == 6) 82 (void)printf("%s ", etheraddr_string(sllp->sll_addr)); 83 84 if (!qflag) 85 (void)printf("%s ", etherproto_string(sllp->sll_protocol)); 86 (void)printf("%d: ", length); 87 } 88 89 /* 90 * This is the top level routine of the printer. 'p' points to the 91 * Linux "cooked capture" header of the packet, 'h->ts' is the timestamp, 92 * 'h->length' is the length of the packet off the wire, and 'h->caplen' 93 * is the number of bytes actually captured. 94 */ 95 u_int 96 sll_if_print(const struct pcap_pkthdr *h, const u_char *p) 97 { 98 u_int caplen = h->caplen; 99 u_int length = h->len; 100 register const struct sll_header *sllp; 101 u_short ether_type; 102 u_short extracted_ethertype; 103 104 if (caplen < SLL_HDR_LEN) { 105 /* 106 * XXX - this "can't happen" because "pcap-linux.c" always 107 * adds this many bytes of header to every packet in a 108 * cooked socket capture. 109 */ 110 printf("[|sll]"); 111 return (caplen); 112 } 113 114 sllp = (const struct sll_header *)p; 115 116 if (eflag) 117 sll_print(sllp, length); 118 119 /* 120 * Go past the cooked-mode header. 121 */ 122 length -= SLL_HDR_LEN; 123 caplen -= SLL_HDR_LEN; 124 p += SLL_HDR_LEN; 125 126 ether_type = ntohs(sllp->sll_protocol); 127 128 /* 129 * Is it (gag) an 802.3 encapsulation, or some non-Ethernet 130 * packet type? 131 */ 132 extracted_ethertype = 0; 133 if (ether_type <= ETHERMTU) { 134 /* 135 * Yes - what type is it? 136 */ 137 switch (ether_type) { 138 139 case LINUX_SLL_P_802_3: 140 /* 141 * Ethernet_802.3 IPX frame. 142 */ 143 ipx_print(p, length); 144 break; 145 146 case LINUX_SLL_P_802_2: 147 /* 148 * 802.2. 149 * Try to print the LLC-layer header & higher layers. 150 */ 151 if (llc_print(p, length, caplen, NULL, NULL, 152 &extracted_ethertype) == 0) 153 goto unknown; /* unknown LLC type */ 154 break; 155 156 default: 157 unknown: 158 /* ether_type not known, print raw packet */ 159 if (!eflag) 160 sll_print(sllp, length + SLL_HDR_LEN); 161 if (extracted_ethertype) { 162 printf("(LLC %s) ", 163 etherproto_string(htons(extracted_ethertype))); 164 } 165 if (!xflag && !qflag) 166 default_print(p, caplen); 167 break; 168 } 169 } else if (ether_encap_print(ether_type, p, length, caplen, 170 &extracted_ethertype) == 0) { 171 /* ether_type not known, print raw packet */ 172 if (!eflag) 173 sll_print(sllp, length + SLL_HDR_LEN); 174 if (!xflag && !qflag) 175 default_print(p, caplen); 176 } 177 178 return (SLL_HDR_LEN); 179 } 180