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[] =
  23     "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.30 2002-12-11 06:55:08 guy 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 /*
  47  * Print an RFC 1483 LLC-encapsulated ATM frame.
  48  */
  49 static void
  50 atm_llc_print(const u_char *p, int length, int caplen)
  51 {
  52         struct ether_header ehdr;
  53         u_short extracted_ethertype;
  54
  55         /*
  56          * Fake up an Ethernet header for the benefit of printers that
  57          * insist on "packetp" pointing to an Ethernet header.
  58          */
  59         memset(&ehdr, '\0', sizeof ehdr);
  60
  61         /*
  62          * Some printers want to get back at the ethernet addresses.
  63          * Rather than pass it all the way down, we set this global.
  64          *
  65          * Actually, the only printers that use packetp are print-arp.c
  66          * and print-bootp.c, and they assume that packetp points to an
  67          * Ethernet header.  The right thing to do is to fix them to know
  68          * which link type is in use when they excavate. XXX
  69          */
  70         packetp = (u_char *)&ehdr;
  71
  72         if (!llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
  73             &extracted_ethertype)) {
  74                 /* ether_type not known, print raw packet */
  75                 if (extracted_ethertype) {
  76                         printf("(LLC %s) ",
  77                 etherproto_string(htons(extracted_ethertype)));
  78                 }
  79                 if (!xflag && !qflag)
  80                         default_print(p, caplen);
  81         }
  82 }
  83
  84 /*
  85  * Given a SAP value, generate the LLC header value for a UI packet
  86  * with that SAP as the source and destination SAP.
  87  */
  88 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
  89
  90 /*
  91  * This is the top level routine of the printer.  'p' points
  92  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
  93  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
  94  * is the number of bytes actually captured.
  95  */
  96 void
  97 atm_if_print(u_char *user _U_, const struct pcap_pkthdr *h, const u_char *p)
  98 {
  99         u_int caplen = h->caplen;
 100         u_int length = h->len;
 101         u_int32_t llchdr;
 102
 103         ++infodelay;
 104         ts_print(&h->ts);
 105
 106         if (caplen < 8) {
 107                 printf("[|atm]");
 108                 goto out;
 109         }
 110
 111         /*
 112          * Some printers want to check that they're not walking off the
 113          * end of the packet.
 114          * Rather than pass it all the way down, we set this global.
 115          */
 116         snapend = p + caplen;
 117
 118         /*
 119          * Extract the presumed LLC header into a variable, for quick
 120          * testing.
 121          * Then check for a header that's neither a header for a SNAP
 122          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 123          * an 802.2-but-no-SNAP IP packet.
 124          */
 125         llchdr = EXTRACT_24BITS(p);
 126         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 127             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 128             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 129                 /*
 130                  * XXX - assume 802.6 MAC header from Fore driver.
 131                  *
 132                  * Unfortunately, the above list doesn't check for
 133                  * all known SAPs, doesn't check for headers where
 134                  * the source and destination SAP aren't the same,
 135                  * and doesn't check for non-UI frames.  It also
 136                  * runs the risk of an 802.6 MAC header that happens
 137                  * to begin with one of those values being
 138                  * incorrectly treated as an 802.2 header.
 139                  *
 140                  * So is that Fore driver still around?  And, if so,
 141                  * is it still putting 802.6 MAC headers on ATM
 142                  * packets?  If so, could it be changed to use a
 143                  * new DLT_IEEE802_6 value if we added it?
 144                  */
 145                 if (eflag)
 146                         printf("%08x%08x %08x%08x ",
 147                                EXTRACT_32BITS(p),
 148                                EXTRACT_32BITS(p+4),
 149                                EXTRACT_32BITS(p+8),
 150                                EXTRACT_32BITS(p+12));
 151                 p += 20;
 152                 length -= 20;
 153                 caplen -= 20;
 154         }
 155         atm_llc_print(p, length, caplen);
 156         if (xflag)
 157                 default_print(p, caplen);
 158  out:
 159         putchar('\n');
 160 }
 161
 162 /*
 163  * ATM signalling.
 164  */
 165 static struct tok msgtype2str[] = {
 166         { CALL_PROCEED,         "Call_proceeding" },
 167         { CONNECT,              "Connect" },
 168         { CONNECT_ACK,          "Connect_ack" },
 169         { SETUP,                "Setup" },
 170         { RELEASE,              "Release" },
 171         { RELEASE_DONE,         "Release_complete" },
 172         { RESTART,              "Restart" },
 173         { RESTART_ACK,          "Restart_ack" },
 174         { STATUS,               "Status" },
 175         { STATUS_ENQ,           "Status_enquiry" },
 176         { ADD_PARTY,            "Add_party" },
 177         { ADD_PARTY_ACK,        "Add_party_ack" },
 178         { ADD_PARTY_REJ,        "Add_party_reject" },
 179         { DROP_PARTY,           "Drop_party" },
 180         { DROP_PARTY_ACK,       "Drop_party_ack" },
 181         { 0,                    NULL }
 182 };
 183
 184 static void
 185 sig_print(const u_char *p, int caplen)
 186 {
 187         bpf_u_int32 call_ref;
 188
 189         if (caplen < PROTO_POS) {
 190                 printf("[|atm]");
 191                 return;
 192         }
 193         if (p[PROTO_POS] == Q2931) {
 194                 /*
 195                  * protocol:Q.2931 for User to Network Interface
 196                  * (UNI 3.1) signalling
 197                  */
 198                 printf("Q.2931");
 199                 if (caplen < MSG_TYPE_POS) {
 200                         printf(" [|atm]");
 201                         return;
 202                 }
 203                 printf(":%s ",
 204                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 205
 206                 if (caplen < CALL_REF_POS+3) {
 207                         printf("[|atm]");
 208                         return;
 209                 }
 210                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 211                 printf("CALL_REF:0x%06x", call_ref);
 212         } else {
 213                 /* SCCOP with some unknown protocol atop it */
 214                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 215         }
 216 }
 217
 218 /*
 219  * Print an ATM PDU (such as an AAL5 PDU).
 220  */
 221 void
 222 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 223     u_int caplen)
 224 {
 225         if (eflag)
 226                 printf("VPI:%u VCI:%u ", vpi, vci);
 227
 228         /*
 229          * Some printers want to check that they're not walking off the
 230          * end of the packet.
 231          * Rather than pass it all the way down, we set this global.
 232          */
 233         snapend = p + caplen;
 234
 235         if (vpi == 0) {
 236                 switch (vci) {
 237
 238                 case PPC:
 239                         sig_print(p, caplen);
 240                         goto out;
 241
 242                 case BCC:
 243                         printf("broadcast sig: ");
 244                         goto out;
 245
 246                 case OAMF4SC:
 247                         printf("oamF4(segment): ");
 248                         goto out;
 249
 250                 case OAMF4EC:
 251                         printf("oamF4(end): ");
 252                         goto out;
 253
 254                 case METAC:
 255                         printf("meta: ");
 256                         goto out;
 257
 258                 case ILMIC:
 259                         printf("ilmi: ");
 260                         snmp_print(p, length);
 261                         goto out;
 262                 }
 263         }
 264
 265         switch (traftype) {
 266
 267         case ATM_LLC:
 268         default:
 269                 /*
 270                  * Assumes traffic is LLC if unknown.
 271                  */
 272                 atm_llc_print(p, length, caplen);
 273                 break;
 274
 275         case ATM_LANE:
 276                 lane_print(p, length, caplen);
 277                 break;
 278         }
 279
 280 out:
 281         if (xflag)
 282                 default_print(p, caplen);
 283 }