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 25 #ifndef lint 26 static const char rcsid[] = 27 "@(#) $Header: print-llc.c,v 1.24 97/01/01 20:56:48 leres Exp $"; 28 #endif 29 30 #include <sys/param.h> 31 #include <sys/time.h> 32 33 #include <netinet/in.h> 34 35 #include <ctype.h> 36 #include <netdb.h> 37 #include <stdio.h> 38 #include <string.h> 39 40 #include "interface.h" 41 #include "addrtoname.h" 42 #include "extract.h" /* must come after interface.h */ 43 44 #include "llc.h" 45 46 static struct tok cmd2str[] = { 47 { LLC_UI, "ui" }, 48 { LLC_TEST, "test" }, 49 { LLC_XID, "xid" }, 50 { LLC_UA, "ua" }, 51 { LLC_DISC, "disc" }, 52 { LLC_DM, "dm" }, 53 { LLC_SABME, "sabme" }, 54 { LLC_FRMR, "frmr" }, 55 { 0, NULL } 56 }; 57 58 /* 59 * Returns non-zero IFF it succeeds in printing the header 60 */ 61 int 62 llc_print(const u_char *p, u_int length, u_int caplen, 63 const u_char *esrc, const u_char *edst) 64 { 65 struct llc llc; 66 register u_short et; 67 register int ret; 68 69 if (caplen < 3) { 70 (void)printf("[|llc]"); 71 default_print((u_char *)p, caplen); 72 return(0); 73 } 74 75 /* Watch out for possible alignment problems */ 76 memcpy((char *)&llc, (char *)p, min(caplen, sizeof(llc))); 77 78 if (llc.ssap == LLCSAP_GLOBAL && llc.dsap == LLCSAP_GLOBAL) { 79 ipx_print(p, length); 80 return (1); 81 } 82 #ifdef notyet 83 else if (p[0] == 0xf0 && p[1] == 0xf0) 84 netbios_print(p, length); 85 #endif 86 if (llc.ssap == LLCSAP_ISONS && llc.dsap == LLCSAP_ISONS 87 && llc.llcui == LLC_UI) { 88 isoclns_print(p + 3, length - 3, caplen - 3, esrc, edst); 89 return (1); 90 } 91 92 if (llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP 93 && llc.llcui == LLC_UI) { 94 if (caplen < sizeof(llc)) { 95 (void)printf("[|llc-snap]"); 96 default_print((u_char *)p, caplen); 97 return (0); 98 } 99 if (vflag) 100 (void)printf("snap %s ", protoid_string(llc.llcpi)); 101 102 caplen -= sizeof(llc); 103 length -= sizeof(llc); 104 p += sizeof(llc); 105 106 /* This is an encapsulated Ethernet packet */ 107 et = EXTRACT_16BITS(&llc.ethertype[0]); 108 ret = ether_encap_print(et, p, length, caplen); 109 if (ret) 110 return (ret); 111 } 112 113 if ((llc.ssap & ~LLC_GSAP) == llc.dsap) { 114 if (eflag) 115 (void)printf("%s ", llcsap_string(llc.dsap)); 116 else 117 (void)printf("%s > %s %s ", 118 etheraddr_string(esrc), 119 etheraddr_string(edst), 120 llcsap_string(llc.dsap)); 121 } else { 122 if (eflag) 123 (void)printf("%s > %s ", 124 llcsap_string(llc.ssap & ~LLC_GSAP), 125 llcsap_string(llc.dsap)); 126 else 127 (void)printf("%s %s > %s %s ", 128 etheraddr_string(esrc), 129 llcsap_string(llc.ssap & ~LLC_GSAP), 130 etheraddr_string(edst), 131 llcsap_string(llc.dsap)); 132 } 133 134 if ((llc.llcu & LLC_U_FMT) == LLC_U_FMT) { 135 const char *m; 136 char f; 137 m = tok2str(cmd2str, "%02x", LLC_U_CMD(llc.llcu)); 138 switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) { 139 case 0: f = 'C'; break; 140 case LLC_GSAP: f = 'R'; break; 141 case LLC_U_POLL: f = 'P'; break; 142 case LLC_GSAP|LLC_U_POLL: f = 'F'; break; 143 default: f = '?'; break; 144 } 145 146 printf("%s/%c", m, f); 147 148 p += 3; 149 length -= 3; 150 caplen -= 3; 151 152 if ((llc.llcu & ~LLC_U_POLL) == LLC_XID) { 153 if (*p == LLC_XID_FI) { 154 printf(": %02x %02x", p[1], p[2]); 155 p += 3; 156 length -= 3; 157 caplen -= 3; 158 } 159 } 160 } else { 161 char f; 162 llc.llcis = ntohs(llc.llcis); 163 switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) { 164 case 0: f = 'C'; break; 165 case LLC_GSAP: f = 'R'; break; 166 case LLC_U_POLL: f = 'P'; break; 167 case LLC_GSAP|LLC_U_POLL: f = 'F'; break; 168 default: f = '?'; break; 169 } 170 171 if ((llc.llcu & LLC_S_FMT) == LLC_S_FMT) { 172 static char *llc_s[] = { "rr", "rej", "rnr", "03" }; 173 (void)printf("%s (r=%d,%c)", 174 llc_s[LLC_S_CMD(llc.llcis)], 175 LLC_IS_NR(llc.llcis), 176 f); 177 } else { 178 (void)printf("I (s=%d,r=%d,%c)", 179 LLC_I_NS(llc.llcis), 180 LLC_IS_NR(llc.llcis), 181 f); 182 } 183 p += 4; 184 length -= 4; 185 caplen -= 4; 186 } 187 (void)printf(" len=%d", length); 188 if (caplen > 0 && !qflag) { 189 default_print_unaligned(p, caplen); 190 } 191 return(1); 192 } 193