1 /* 2 * Copyright (c) 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 * Code by Matt Thomas, Digital Equipment Corporation 22 * with an awful lot of hacking by Jeffrey Mogul, DECWRL 23 * 24 * $FreeBSD$ 25 */ 26 27 #ifndef lint 28 static const char rcsid[] = 29 "@(#) $Header: /tcpdump/master/tcpdump/print-llc.c,v 1.27 1999/12/22 06:27:21 itojun Exp $"; 30 #endif 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #include <sys/param.h> 37 #include <sys/time.h> 38 39 #include <netinet/in.h> 40 41 #include <ctype.h> 42 #include <netdb.h> 43 #include <stdio.h> 44 #include <string.h> 45 46 #include "interface.h" 47 #include "addrtoname.h" 48 #include "extract.h" /* must come after interface.h */ 49 50 #include "llc.h" 51 52 static struct tok cmd2str[] = { 53 { LLC_UI, "ui" }, 54 { LLC_TEST, "test" }, 55 { LLC_XID, "xid" }, 56 { LLC_UA, "ua" }, 57 { LLC_DISC, "disc" }, 58 { LLC_DM, "dm" }, 59 { LLC_SABME, "sabme" }, 60 { LLC_FRMR, "frmr" }, 61 { 0, NULL } 62 }; 63 64 /* 65 * Returns non-zero IFF it succeeds in printing the header 66 */ 67 int 68 llc_print(const u_char *p, u_int length, u_int caplen, 69 const u_char *esrc, const u_char *edst) 70 { 71 struct llc llc; 72 register u_short et; 73 register int ret; 74 75 if (caplen < 3) { 76 (void)printf("[|llc]"); 77 default_print((u_char *)p, caplen); 78 return(0); 79 } 80 81 /* Watch out for possible alignment problems */ 82 memcpy((char *)&llc, (char *)p, min(caplen, sizeof(llc))); 83 84 if (llc.ssap == LLCSAP_GLOBAL && llc.dsap == LLCSAP_GLOBAL) { 85 ipx_print(p, length); 86 return (1); 87 } 88 if (llc.ssap == 0xf0 && llc.dsap == 0xf0) { 89 /* 90 * we don't actually have a full netbeui parser yet, but the 91 * smb parser can handle many smb-in-netbeui packets, which 92 * is very useful, so we call that 93 */ 94 netbeui_print(p + 2, p + min(caplen, length)); 95 return (1); 96 } 97 if (llc.ssap == LLCSAP_ISONS && llc.dsap == LLCSAP_ISONS 98 && llc.llcui == LLC_UI) { 99 isoclns_print(p + 3, length - 3, caplen - 3, esrc, edst); 100 return (1); 101 } 102 103 if (llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP 104 && llc.llcui == LLC_UI) { 105 if (caplen < sizeof(llc)) { 106 (void)printf("[|llc-snap]"); 107 default_print((u_char *)p, caplen); 108 return (0); 109 } 110 if (vflag) 111 (void)printf("snap %s ", protoid_string(llc.llcpi)); 112 113 caplen -= sizeof(llc); 114 length -= sizeof(llc); 115 p += sizeof(llc); 116 117 /* This is an encapsulated Ethernet packet */ 118 et = EXTRACT_16BITS(&llc.ethertype[0]); 119 ret = ether_encap_print(et, p, length, caplen); 120 if (ret) 121 return (ret); 122 } 123 124 if ((llc.ssap & ~LLC_GSAP) == llc.dsap) { 125 if (eflag) 126 (void)printf("%s ", llcsap_string(llc.dsap)); 127 else 128 (void)printf("%s > %s %s ", 129 etheraddr_string(esrc), 130 etheraddr_string(edst), 131 llcsap_string(llc.dsap)); 132 } else { 133 if (eflag) 134 (void)printf("%s > %s ", 135 llcsap_string(llc.ssap & ~LLC_GSAP), 136 llcsap_string(llc.dsap)); 137 else 138 (void)printf("%s %s > %s %s ", 139 etheraddr_string(esrc), 140 llcsap_string(llc.ssap & ~LLC_GSAP), 141 etheraddr_string(edst), 142 llcsap_string(llc.dsap)); 143 } 144 145 if ((llc.llcu & LLC_U_FMT) == LLC_U_FMT) { 146 const char *m; 147 char f; 148 m = tok2str(cmd2str, "%02x", LLC_U_CMD(llc.llcu)); 149 switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) { 150 case 0: f = 'C'; break; 151 case LLC_GSAP: f = 'R'; break; 152 case LLC_U_POLL: f = 'P'; break; 153 case LLC_GSAP|LLC_U_POLL: f = 'F'; break; 154 default: f = '?'; break; 155 } 156 157 printf("%s/%c", m, f); 158 159 p += 3; 160 length -= 3; 161 caplen -= 3; 162 163 if ((llc.llcu & ~LLC_U_POLL) == LLC_XID) { 164 if (*p == LLC_XID_FI) { 165 printf(": %02x %02x", p[1], p[2]); 166 p += 3; 167 length -= 3; 168 caplen -= 3; 169 } 170 } 171 172 if (!strcmp(m,"ui") && f=='C') { 173 /* 174 * we don't have a proper ipx decoder yet, but there 175 * is a partial one in the smb code 176 */ 177 ipx_netbios_print(p,p+min(caplen,length)); 178 } 179 180 } else { 181 char f; 182 llc.llcis = ntohs(llc.llcis); 183 switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) { 184 case 0: f = 'C'; break; 185 case LLC_GSAP: f = 'R'; break; 186 case LLC_U_POLL: f = 'P'; break; 187 case LLC_GSAP|LLC_U_POLL: f = 'F'; break; 188 default: f = '?'; break; 189 } 190 191 if ((llc.llcu & LLC_S_FMT) == LLC_S_FMT) { 192 static char *llc_s[] = { "rr", "rej", "rnr", "03" }; 193 (void)printf("%s (r=%d,%c)", 194 llc_s[LLC_S_CMD(llc.llcis)], 195 LLC_IS_NR(llc.llcis), 196 f); 197 } else { 198 (void)printf("I (s=%d,r=%d,%c)", 199 LLC_I_NS(llc.llcis), 200 LLC_IS_NR(llc.llcis), 201 f); 202 } 203 p += 4; 204 length -= 4; 205 caplen -= 4; 206 } 207 (void)printf(" len=%d", length); 208 if (caplen > 0 && !qflag) { 209 default_print_unaligned(p, caplen); 210 } 211 return(1); 212 } 213