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 1.38.2.2 2005/06/20 07:45:06 hannes 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 struct tok oam_celltype_values[] = { 49 { 0x1, "Fault Management" }, 50 { 0x2, "Performance Management" }, 51 { 0x8, "activate/deactivate" }, 52 { 0xf, "System Management" }, 53 { 0, NULL } 54 }; 55 56 struct tok oam_fm_functype_values[] = { 57 { 0x0, "AIS" }, 58 { 0x1, "RDI" }, 59 { 0x4, "Continuity Check" }, 60 { 0x8, "Loopback" }, 61 { 0, NULL } 62 }; 63 64 struct tok oam_pm_functype_values[] = { 65 { 0x0, "Forward Monitoring" }, 66 { 0x1, "Backward Reporting" }, 67 { 0x2, "Monitoring and Reporting" }, 68 { 0, NULL } 69 }; 70 71 struct tok oam_ad_functype_values[] = { 72 { 0x0, "Performance Monitoring" }, 73 { 0x1, "Continuity Check" }, 74 { 0, NULL } 75 }; 76 77 static const struct tok *oam_functype_values[16] = { 78 NULL, 79 oam_fm_functype_values, /* 1 */ 80 oam_pm_functype_values, /* 2 */ 81 NULL, 82 NULL, 83 NULL, 84 NULL, 85 NULL, 86 oam_ad_functype_values, /* 8 */ 87 NULL, 88 NULL, 89 NULL, 90 NULL, 91 NULL, 92 NULL, 93 NULL 94 }; 95 96 /* 97 * Print an RFC 1483 LLC-encapsulated ATM frame. 98 */ 99 static void 100 atm_llc_print(const u_char *p, int length, int caplen) 101 { 102 u_short extracted_ethertype; 103 104 if (!llc_print(p, length, caplen, NULL, NULL, 105 &extracted_ethertype)) { 106 /* ether_type not known, print raw packet */ 107 if (extracted_ethertype) { 108 printf("(LLC %s) ", 109 etherproto_string(htons(extracted_ethertype))); 110 } 111 if (!xflag && !qflag) 112 default_print(p, caplen); 113 } 114 } 115 116 /* 117 * Given a SAP value, generate the LLC header value for a UI packet 118 * with that SAP as the source and destination SAP. 119 */ 120 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03) 121 122 /* 123 * This is the top level routine of the printer. 'p' points 124 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp, 125 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 126 * is the number of bytes actually captured. 127 */ 128 u_int 129 atm_if_print(const struct pcap_pkthdr *h, const u_char *p) 130 { 131 u_int caplen = h->caplen; 132 u_int length = h->len; 133 u_int32_t llchdr; 134 u_int hdrlen = 0; 135 136 if (caplen < 8) { 137 printf("[|atm]"); 138 return (caplen); 139 } 140 /* 141 * Extract the presumed LLC header into a variable, for quick 142 * testing. 143 * Then check for a header that's neither a header for a SNAP 144 * packet nor an RFC 2684 routed NLPID-formatted PDU nor 145 * an 802.2-but-no-SNAP IP packet. 146 */ 147 llchdr = EXTRACT_24BITS(p); 148 if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) && 149 llchdr != LLC_UI_HDR(LLCSAP_ISONS) && 150 llchdr != LLC_UI_HDR(LLCSAP_IP)) { 151 /* 152 * XXX - assume 802.6 MAC header from Fore driver. 153 * 154 * Unfortunately, the above list doesn't check for 155 * all known SAPs, doesn't check for headers where 156 * the source and destination SAP aren't the same, 157 * and doesn't check for non-UI frames. It also 158 * runs the risk of an 802.6 MAC header that happens 159 * to begin with one of those values being 160 * incorrectly treated as an 802.2 header. 161 * 162 * So is that Fore driver still around? And, if so, 163 * is it still putting 802.6 MAC headers on ATM 164 * packets? If so, could it be changed to use a 165 * new DLT_IEEE802_6 value if we added it? 166 */ 167 if (eflag) 168 printf("%08x%08x %08x%08x ", 169 EXTRACT_32BITS(p), 170 EXTRACT_32BITS(p+4), 171 EXTRACT_32BITS(p+8), 172 EXTRACT_32BITS(p+12)); 173 p += 20; 174 length -= 20; 175 caplen -= 20; 176 hdrlen += 20; 177 } 178 atm_llc_print(p, length, caplen); 179 return (hdrlen); 180 } 181 182 /* 183 * ATM signalling. 184 */ 185 static struct tok msgtype2str[] = { 186 { CALL_PROCEED, "Call_proceeding" }, 187 { CONNECT, "Connect" }, 188 { CONNECT_ACK, "Connect_ack" }, 189 { SETUP, "Setup" }, 190 { RELEASE, "Release" }, 191 { RELEASE_DONE, "Release_complete" }, 192 { RESTART, "Restart" }, 193 { RESTART_ACK, "Restart_ack" }, 194 { STATUS, "Status" }, 195 { STATUS_ENQ, "Status_enquiry" }, 196 { ADD_PARTY, "Add_party" }, 197 { ADD_PARTY_ACK, "Add_party_ack" }, 198 { ADD_PARTY_REJ, "Add_party_reject" }, 199 { DROP_PARTY, "Drop_party" }, 200 { DROP_PARTY_ACK, "Drop_party_ack" }, 201 { 0, NULL } 202 }; 203 204 static void 205 sig_print(const u_char *p, int caplen) 206 { 207 bpf_u_int32 call_ref; 208 209 if (caplen < PROTO_POS) { 210 printf("[|atm]"); 211 return; 212 } 213 if (p[PROTO_POS] == Q2931) { 214 /* 215 * protocol:Q.2931 for User to Network Interface 216 * (UNI 3.1) signalling 217 */ 218 printf("Q.2931"); 219 if (caplen < MSG_TYPE_POS) { 220 printf(" [|atm]"); 221 return; 222 } 223 printf(":%s ", 224 tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])); 225 226 if (caplen < CALL_REF_POS+3) { 227 printf("[|atm]"); 228 return; 229 } 230 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]); 231 printf("CALL_REF:0x%06x", call_ref); 232 } else { 233 /* SCCOP with some unknown protocol atop it */ 234 printf("SSCOP, proto %d ", p[PROTO_POS]); 235 } 236 } 237 238 /* 239 * Print an ATM PDU (such as an AAL5 PDU). 240 */ 241 void 242 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length, 243 u_int caplen) 244 { 245 if (eflag) 246 printf("VPI:%u VCI:%u ", vpi, vci); 247 248 if (vpi == 0) { 249 switch (vci) { 250 251 case PPC: 252 sig_print(p, caplen); 253 return; 254 255 case BCC: 256 printf("broadcast sig: "); 257 return; 258 259 case OAMF4SC: /* fall through */ 260 case OAMF4EC: 261 oam_print(p, length, ATM_OAM_HEC); 262 return; 263 264 case METAC: 265 printf("meta: "); 266 return; 267 268 case ILMIC: 269 printf("ilmi: "); 270 snmp_print(p, length); 271 return; 272 } 273 } 274 275 switch (traftype) { 276 277 case ATM_LLC: 278 default: 279 /* 280 * Assumes traffic is LLC if unknown. 281 */ 282 atm_llc_print(p, length, caplen); 283 break; 284 285 case ATM_LANE: 286 lane_print(p, length, caplen); 287 break; 288 } 289 } 290 291 int 292 oam_print (const u_char *p, u_int length, u_int hec) { 293 294 u_int16_t cell_header, cell_type, func_type,vpi,vci,payload,clp; 295 296 cell_header = EXTRACT_32BITS(p); 297 cell_type = ((*(p+4+hec))>>4) & 0x0f; 298 func_type = *(p+4+hec) & 0x0f; 299 300 vpi = (cell_header>>20)&0xff; 301 vci = (cell_header>>4)&0xffff; 302 payload = (cell_header>>1)&0x7; 303 clp = cell_header&0x1; 304 305 switch (vci) { 306 case OAMF4SC: 307 printf("OAM F4 (segment), "); 308 break; 309 case OAMF4EC: 310 printf("OAM F4 (end), "); 311 break; 312 default: 313 printf("OAM F5, "); 314 break; 315 } 316 317 if (eflag) 318 printf("vpi %u, vci %u, payload %u, clp %u, ",vpi,vci,payload,clp); 319 320 printf("cell-type %s (%u)", 321 tok2str(oam_celltype_values, "unknown", cell_type), 322 cell_type); 323 324 if (oam_functype_values[cell_type] == NULL) 325 printf(", func-type unknown (%u)", func_type); 326 else 327 printf(", func-type %s (%u)", 328 bittok2str(oam_functype_values[cell_type],"none",func_type), 329 func_type); 330 331 printf(", length %u",length); 332 return 1; 333 } 334