1 /* 2 * Copyright (c) 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 * $FreeBSD$ 22 */ 23 #ifndef lint 24 static const char rcsid[] _U_ = 25 "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.33.2.2 2003/11/16 08:51:11 guy Exp $ (LBL)"; 26 #endif 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 #include <stdio.h> 35 #include <pcap.h> 36 #include <string.h> 37 38 #include "interface.h" 39 #include "extract.h" 40 #include "addrtoname.h" 41 #include "ethertype.h" 42 #include "atm.h" 43 #include "atmuni31.h" 44 #include "llc.h" 45 46 #include "ether.h" 47 48 /* 49 * Print an RFC 1483 LLC-encapsulated ATM frame. 50 */ 51 static void 52 atm_llc_print(const u_char *p, int length, int caplen) 53 { 54 u_short extracted_ethertype; 55 56 if (!llc_print(p, length, caplen, NULL, NULL, 57 &extracted_ethertype)) { 58 /* ether_type not known, print raw packet */ 59 if (extracted_ethertype) { 60 printf("(LLC %s) ", 61 etherproto_string(htons(extracted_ethertype))); 62 } 63 if (!xflag && !qflag) 64 default_print(p, caplen); 65 } 66 } 67 68 /* 69 * Given a SAP value, generate the LLC header value for a UI packet 70 * with that SAP as the source and destination SAP. 71 */ 72 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03) 73 74 /* 75 * This is the top level routine of the printer. 'p' points 76 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp, 77 * 'h->length' is the length of the packet off the wire, and 'h->caplen' 78 * is the number of bytes actually captured. 79 */ 80 u_int 81 atm_if_print(const struct pcap_pkthdr *h, const u_char *p) 82 { 83 u_int caplen = h->caplen; 84 u_int length = h->len; 85 u_int32_t llchdr; 86 u_int hdrlen = 0; 87 88 if (caplen < 8) { 89 printf("[|atm]"); 90 return (caplen); 91 } 92 /* 93 * Extract the presumed LLC header into a variable, for quick 94 * testing. 95 * Then check for a header that's neither a header for a SNAP 96 * packet nor an RFC 2684 routed NLPID-formatted PDU nor 97 * an 802.2-but-no-SNAP IP packet. 98 */ 99 llchdr = EXTRACT_24BITS(p); 100 if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) && 101 llchdr != LLC_UI_HDR(LLCSAP_ISONS) && 102 llchdr != LLC_UI_HDR(LLCSAP_IP)) { 103 /* 104 * XXX - assume 802.6 MAC header from Fore driver. 105 * 106 * Unfortunately, the above list doesn't check for 107 * all known SAPs, doesn't check for headers where 108 * the source and destination SAP aren't the same, 109 * and doesn't check for non-UI frames. It also 110 * runs the risk of an 802.6 MAC header that happens 111 * to begin with one of those values being 112 * incorrectly treated as an 802.2 header. 113 * 114 * So is that Fore driver still around? And, if so, 115 * is it still putting 802.6 MAC headers on ATM 116 * packets? If so, could it be changed to use a 117 * new DLT_IEEE802_6 value if we added it? 118 */ 119 if (eflag) 120 printf("%08x%08x %08x%08x ", 121 EXTRACT_32BITS(p), 122 EXTRACT_32BITS(p+4), 123 EXTRACT_32BITS(p+8), 124 EXTRACT_32BITS(p+12)); 125 p += 20; 126 length -= 20; 127 caplen -= 20; 128 hdrlen += 20; 129 } 130 atm_llc_print(p, length, caplen); 131 return (hdrlen); 132 } 133 134 /* 135 * ATM signalling. 136 */ 137 static struct tok msgtype2str[] = { 138 { CALL_PROCEED, "Call_proceeding" }, 139 { CONNECT, "Connect" }, 140 { CONNECT_ACK, "Connect_ack" }, 141 { SETUP, "Setup" }, 142 { RELEASE, "Release" }, 143 { RELEASE_DONE, "Release_complete" }, 144 { RESTART, "Restart" }, 145 { RESTART_ACK, "Restart_ack" }, 146 { STATUS, "Status" }, 147 { STATUS_ENQ, "Status_enquiry" }, 148 { ADD_PARTY, "Add_party" }, 149 { ADD_PARTY_ACK, "Add_party_ack" }, 150 { ADD_PARTY_REJ, "Add_party_reject" }, 151 { DROP_PARTY, "Drop_party" }, 152 { DROP_PARTY_ACK, "Drop_party_ack" }, 153 { 0, NULL } 154 }; 155 156 static void 157 sig_print(const u_char *p, int caplen) 158 { 159 bpf_u_int32 call_ref; 160 161 if (caplen < PROTO_POS) { 162 printf("[|atm]"); 163 return; 164 } 165 if (p[PROTO_POS] == Q2931) { 166 /* 167 * protocol:Q.2931 for User to Network Interface 168 * (UNI 3.1) signalling 169 */ 170 printf("Q.2931"); 171 if (caplen < MSG_TYPE_POS) { 172 printf(" [|atm]"); 173 return; 174 } 175 printf(":%s ", 176 tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])); 177 178 if (caplen < CALL_REF_POS+3) { 179 printf("[|atm]"); 180 return; 181 } 182 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]); 183 printf("CALL_REF:0x%06x", call_ref); 184 } else { 185 /* SCCOP with some unknown protocol atop it */ 186 printf("SSCOP, proto %d ", p[PROTO_POS]); 187 } 188 } 189 190 /* 191 * Print an ATM PDU (such as an AAL5 PDU). 192 */ 193 void 194 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length, 195 u_int caplen) 196 { 197 if (eflag) 198 printf("VPI:%u VCI:%u ", vpi, vci); 199 200 if (vpi == 0) { 201 switch (vci) { 202 203 case PPC: 204 sig_print(p, caplen); 205 return; 206 207 case BCC: 208 printf("broadcast sig: "); 209 return; 210 211 case OAMF4SC: 212 printf("oamF4(segment): "); 213 return; 214 215 case OAMF4EC: 216 printf("oamF4(end): "); 217 return; 218 219 case METAC: 220 printf("meta: "); 221 return; 222 223 case ILMIC: 224 printf("ilmi: "); 225 snmp_print(p, length); 226 return; 227 } 228 } 229 230 switch (traftype) { 231 232 case ATM_LLC: 233 default: 234 /* 235 * Assumes traffic is LLC if unknown. 236 */ 237 atm_llc_print(p, length, caplen); 238 break; 239 240 case ATM_LANE: 241 lane_print(p, length, caplen); 242 break; 243 } 244 } 245