1 /* 2 * Copyright (c) 1992, 1993, 1994, 1995, 1996 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 22 /* 23 * Code by Matt Thomas, Digital Equipment Corporation 24 * with an awful lot of hacking by Jeffrey Mogul, DECWRL 25 */ 26 27 #ifndef lint 28 static char rcsid[] = 29 "@(#)$Header: print-llc.c,v 1.20 96/07/23 14:17:25 leres Exp $"; 30 #endif 31 32 #include <sys/param.h> 33 #include <sys/time.h> 34 35 #include <netinet/in.h> 36 37 #include <ctype.h> 38 #include <netdb.h> 39 #include <signal.h> 40 #include <stdio.h> 41 #include <string.h> 42 43 #include "interface.h" 44 #include "addrtoname.h" 45 #include "extract.h" /* must come after interface.h */ 46 47 #include "llc.h" 48 49 static struct tok cmd2str[] = { 50 { LLC_UI, "ui" }, 51 { LLC_TEST, "test" }, 52 { LLC_XID, "xid" }, 53 { LLC_UA, "ua" }, 54 { LLC_DISC, "disc" }, 55 { LLC_DM, "dm" }, 56 { LLC_SABME, "sabme" }, 57 { LLC_FRMR, "frmr" }, 58 { 0, NULL } 59 }; 60 61 /* 62 * Returns non-zero IFF it succeeds in printing the header 63 */ 64 int 65 llc_print(const u_char *p, u_int length, u_int caplen, 66 const u_char *esrc, const u_char *edst) 67 { 68 struct llc llc; 69 register u_short et; 70 register int ret; 71 72 if (caplen < 3) { 73 (void)printf("[|llc]"); 74 default_print((u_char *)p, caplen); 75 return(0); 76 } 77 78 /* Watch out for possible alignment problems */ 79 memcpy((char *)&llc, (char *)p, min(caplen, sizeof(llc))); 80 81 if (llc.ssap == LLCSAP_GLOBAL && llc.dsap == LLCSAP_GLOBAL) { 82 ipx_print(p, length); 83 return (1); 84 } 85 #ifdef notyet 86 else if (p[0] == 0xf0 && p[1] == 0xf0) 87 netbios_print(p, length); 88 #endif 89 if (llc.ssap == LLCSAP_ISONS && llc.dsap == LLCSAP_ISONS 90 && llc.llcui == LLC_UI) { 91 isoclns_print(p + 3, length - 3, caplen - 3, esrc, edst); 92 return (1); 93 } 94 95 if (llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP 96 && llc.llcui == LLC_UI) { 97 if (caplen < sizeof(llc)) { 98 (void)printf("[|llc-snap]"); 99 default_print((u_char *)p, caplen); 100 return (0); 101 } 102 if (vflag) 103 (void)printf("snap %s ", protoid_string(llc.llcpi)); 104 105 caplen -= sizeof(llc); 106 length -= sizeof(llc); 107 p += sizeof(llc); 108 109 /* This is an encapsulated Ethernet packet */ 110 et = EXTRACT_16BITS(&llc.ethertype[0]); 111 ret = ether_encap_print(et, p, length, caplen); 112 if (ret) 113 return (ret); 114 } 115 116 if ((llc.ssap & ~LLC_GSAP) == llc.dsap) { 117 if (eflag) 118 (void)printf("%s ", llcsap_string(llc.dsap)); 119 else 120 (void)printf("%s > %s %s ", 121 etheraddr_string(esrc), 122 etheraddr_string(edst), 123 llcsap_string(llc.dsap)); 124 } else { 125 if (eflag) 126 (void)printf("%s > %s ", 127 llcsap_string(llc.ssap & ~LLC_GSAP), 128 llcsap_string(llc.dsap)); 129 else 130 (void)printf("%s %s > %s %s ", 131 etheraddr_string(esrc), 132 llcsap_string(llc.ssap & ~LLC_GSAP), 133 etheraddr_string(edst), 134 llcsap_string(llc.dsap)); 135 } 136 137 if ((llc.llcu & LLC_U_FMT) == LLC_U_FMT) { 138 const char *m; 139 char f; 140 m = tok2str(cmd2str, "%02x", LLC_U_CMD(llc.llcu)); 141 switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) { 142 case 0: f = 'C'; break; 143 case LLC_GSAP: f = 'R'; break; 144 case LLC_U_POLL: f = 'P'; break; 145 case LLC_GSAP|LLC_U_POLL: f = 'F'; break; 146 default: f = '?'; break; 147 } 148 149 printf("%s/%c", m, f); 150 151 p += 3; 152 length -= 3; 153 caplen -= 3; 154 155 if ((llc.llcu & ~LLC_U_POLL) == LLC_XID) { 156 if (*p == LLC_XID_FI) { 157 printf(": %02x %02x", p[1], p[2]); 158 p += 3; 159 length -= 3; 160 caplen -= 3; 161 } 162 } 163 } else { 164 char f; 165 llc.llcis = ntohs(llc.llcis); 166 switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) { 167 case 0: f = 'C'; break; 168 case LLC_GSAP: f = 'R'; break; 169 case LLC_U_POLL: f = 'P'; break; 170 case LLC_GSAP|LLC_U_POLL: f = 'F'; break; 171 default: f = '?'; break; 172 } 173 174 if ((llc.llcu & LLC_S_FMT) == LLC_S_FMT) { 175 static char *llc_s[] = { "rr", "rej", "rnr", "03" }; 176 (void)printf("%s (r=%d,%c)", 177 llc_s[LLC_S_CMD(llc.llcis)], 178 LLC_IS_NR(llc.llcis), 179 f); 180 } else { 181 (void)printf("I (s=%d,r=%d,%c)", 182 LLC_I_NS(llc.llcis), 183 LLC_IS_NR(llc.llcis), 184 f); 185 } 186 p += 4; 187 length -= 4; 188 caplen -= 4; 189 } 190 (void)printf(" len=%d", length); 191 if (caplen > 0 !qflag) { 192 default_print_unaligned(p, caplen); 193 } 194 return(1); 195 } 196