The Tcpdump Group git mirrors - tcpdump/blob - print-atm.c

   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 #ifndef lint
  22 static const char rcsid[] _U_ =
  23     "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.43 2006-01-22 10:23:09 hannes Exp $ (LBL)";
  24 #endif
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <tcpdump-stdinc.h>
  31
  32 #include <stdio.h>
  33 #include <pcap.h>
  34 #include <string.h>
  35
  36 #include "interface.h"
  37 #include "extract.h"
  38 #include "addrtoname.h"
  39 #include "ethertype.h"
  40 #include "atm.h"
  41 #include "atmuni31.h"
  42 #include "llc.h"
  43
  44 #include "ether.h"
  45
  46 struct tok oam_f_values[] = {
  47     { OAMF4SC, "OAM F4 (segment)" },
  48     { OAMF4EC, "OAM F4 (end)" },
  49     { 0, NULL }
  50 };
  51
  52 struct tok oam_celltype_values[] = {
  53     { 0x1, "Fault Management" },
  54     { 0x2, "Performance Management" },
  55     { 0x8, "activate/deactivate" },
  56     { 0xf, "System Management" },
  57     { 0, NULL }
  58 };
  59
  60 struct tok oam_fm_functype_values[] = {
  61     { 0x0, "AIS" },
  62     { 0x1, "RDI" },
  63     { 0x4, "Continuity Check" },
  64     { 0x8, "Loopback" },
  65     { 0, NULL }
  66 };
  67
  68 struct tok oam_pm_functype_values[] = {
  69     { 0x0, "Forward Monitoring" },
  70     { 0x1, "Backward Reporting" },
  71     { 0x2, "Monitoring and Reporting" },
  72     { 0, NULL }
  73 };
  74
  75 struct tok oam_ad_functype_values[] = {
  76     { 0x0, "Performance Monitoring" },
  77     { 0x1, "Continuity Check" },
  78     { 0, NULL }
  79 };
  80
  81 static const struct tok *oam_functype_values[16] = {
  82     NULL,
  83     oam_fm_functype_values, /* 1 */
  84     oam_pm_functype_values, /* 2 */
  85     NULL,
  86     NULL,
  87     NULL,
  88     NULL,
  89     NULL,
  90     oam_ad_functype_values, /* 8 */
  91     NULL,
  92     NULL,
  93     NULL,
  94     NULL,
  95     NULL,
  96     NULL,
  97     NULL
  98 };
  99
 100 /*
 101  * Print an RFC 1483 LLC-encapsulated ATM frame.
 102  */
 103 static void
 104 atm_llc_print(const u_char *p, int length, int caplen)
 105 {
 106         u_short extracted_ethertype;
 107
 108         if (!llc_print(p, length, caplen, NULL, NULL,
 109             &extracted_ethertype)) {
 110                 /* ether_type not known, print raw packet */
 111                 if (extracted_ethertype) {
 112                         printf("(LLC %s) ",
 113                 etherproto_string(htons(extracted_ethertype)));
 114                 }
 115                 if (!suppress_default_print)
 116                         default_print(p, caplen);
 117         }
 118 }
 119
 120 /*
 121  * Given a SAP value, generate the LLC header value for a UI packet
 122  * with that SAP as the source and destination SAP.
 123  */
 124 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
 125
 126 /*
 127  * This is the top level routine of the printer.  'p' points
 128  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
 129  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 130  * is the number of bytes actually captured.
 131  */
 132 u_int
 133 atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
 134 {
 135         u_int caplen = h->caplen;
 136         u_int length = h->len;
 137         u_int32_t llchdr;
 138         u_int hdrlen = 0;
 139
 140         if (caplen < 8) {
 141                 printf("[|atm]");
 142                 return (caplen);
 143         }
 144
 145         /*
 146          * Extract the presumed LLC header into a variable, for quick
 147          * testing.
 148          * Then check for a header that's neither a header for a SNAP
 149          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 150          * an 802.2-but-no-SNAP IP packet.
 151          */
 152         llchdr = EXTRACT_24BITS(p);
 153         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 154             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 155             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 156                 /*
 157                  * XXX - assume 802.6 MAC header from Fore driver.
 158                  *
 159                  * Unfortunately, the above list doesn't check for
 160                  * all known SAPs, doesn't check for headers where
 161                  * the source and destination SAP aren't the same,
 162                  * and doesn't check for non-UI frames.  It also
 163                  * runs the risk of an 802.6 MAC header that happens
 164                  * to begin with one of those values being
 165                  * incorrectly treated as an 802.2 header.
 166                  *
 167                  * So is that Fore driver still around?  And, if so,
 168                  * is it still putting 802.6 MAC headers on ATM
 169                  * packets?  If so, could it be changed to use a
 170                  * new DLT_IEEE802_6 value if we added it?
 171                  */
 172                 if (eflag)
 173                         printf("%08x%08x %08x%08x ",
 174                                EXTRACT_32BITS(p),
 175                                EXTRACT_32BITS(p+4),
 176                                EXTRACT_32BITS(p+8),
 177                                EXTRACT_32BITS(p+12));
 178                 p += 20;
 179                 length -= 20;
 180                 caplen -= 20;
 181                 hdrlen += 20;
 182         }
 183         atm_llc_print(p, length, caplen);
 184         return (hdrlen);
 185 }
 186
 187 /*
 188  * ATM signalling.
 189  */
 190 static struct tok msgtype2str[] = {
 191         { CALL_PROCEED,         "Call_proceeding" },
 192         { CONNECT,              "Connect" },
 193         { CONNECT_ACK,          "Connect_ack" },
 194         { SETUP,                "Setup" },
 195         { RELEASE,              "Release" },
 196         { RELEASE_DONE,         "Release_complete" },
 197         { RESTART,              "Restart" },
 198         { RESTART_ACK,          "Restart_ack" },
 199         { STATUS,               "Status" },
 200         { STATUS_ENQ,           "Status_enquiry" },
 201         { ADD_PARTY,            "Add_party" },
 202         { ADD_PARTY_ACK,        "Add_party_ack" },
 203         { ADD_PARTY_REJ,        "Add_party_reject" },
 204         { DROP_PARTY,           "Drop_party" },
 205         { DROP_PARTY_ACK,       "Drop_party_ack" },
 206         { 0,                    NULL }
 207 };
 208
 209 static void
 210 sig_print(const u_char *p, int caplen)
 211 {
 212         bpf_u_int32 call_ref;
 213
 214         if (caplen < PROTO_POS) {
 215                 printf("[|atm]");
 216                 return;
 217         }
 218         if (p[PROTO_POS] == Q2931) {
 219                 /*
 220                  * protocol:Q.2931 for User to Network Interface
 221                  * (UNI 3.1) signalling
 222                  */
 223                 printf("Q.2931");
 224                 if (caplen < MSG_TYPE_POS) {
 225                         printf(" [|atm]");
 226                         return;
 227                 }
 228                 printf(":%s ",
 229                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 230
 231                 if (caplen < CALL_REF_POS+3) {
 232                         printf("[|atm]");
 233                         return;
 234                 }
 235                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 236                 printf("CALL_REF:0x%06x", call_ref);
 237         } else {
 238                 /* SCCOP with some unknown protocol atop it */
 239                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 240         }
 241 }
 242
 243 /*
 244  * Print an ATM PDU (such as an AAL5 PDU).
 245  */
 246 void
 247 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 248     u_int caplen)
 249 {
 250         if (eflag)
 251                 printf("VPI:%u VCI:%u ", vpi, vci);
 252
 253         if (vpi == 0) {
 254                 switch (vci) {
 255
 256                 case PPC:
 257                         sig_print(p, caplen);
 258                         return;
 259
 260                 case BCC:
 261                         printf("broadcast sig: ");
 262                         return;
 263
 264                 case OAMF4SC: /* fall through */
 265                 case OAMF4EC:
 266                         oam_print(p, length, ATM_OAM_HEC);
 267                         return;
 268
 269                 case METAC:
 270                         printf("meta: ");
 271                         return;
 272
 273                 case ILMIC:
 274                         printf("ilmi: ");
 275                         snmp_print(p, length);
 276                         return;
 277                 }
 278         }
 279
 280         switch (traftype) {
 281
 282         case ATM_LLC:
 283         default:
 284                 /*
 285                  * Assumes traffic is LLC if unknown.
 286                  */
 287                 atm_llc_print(p, length, caplen);
 288                 break;
 289
 290         case ATM_LANE:
 291                 lane_print(p, length, caplen);
 292                 break;
 293         }
 294 }
 295
 296 int
 297 oam_print (const u_char *p, u_int length, u_int hec) {
 298
 299     u_int32_t cell_header;
 300     u_int16_t cell_type, func_type,vpi,vci,payload,clp;
 301
 302     cell_header = EXTRACT_32BITS(p+hec);
 303     cell_type = ((*(p+4+hec))>>4) & 0x0f;
 304     func_type = *(p+4+hec) & 0x0f;
 305
 306     vpi = (cell_header>>20)&0xff;
 307     vci = (cell_header>>4)&0xffff;
 308     payload = (cell_header>>1)&0x7;
 309     clp = cell_header&0x1;
 310
 311     printf("%s, vpi %u, vci %u, payload %u, clp %u, ",
 312            tok2str(oam_f_values, "OAM F5", vci),
 313            vpi, vci, payload, clp);
 314
 315     printf("cell-type %s (%u)",
 316            tok2str(oam_celltype_values, "unknown", cell_type),
 317            cell_type);
 318
 319     if (oam_functype_values[cell_type] == NULL)
 320         printf(", func-type unknown (%u)", func_type);
 321     else
 322         printf(", func-type %s (%u)",
 323                bittok2str(oam_functype_values[cell_type],"none",func_type),
 324                func_type);
 325
 326     printf(", length %u",length);
 327     return 1;
 328 }