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 1.25 2002-08-01 08:53:01 risso 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
  43 #include "ether.h"
  44
  45 /*
  46  * Print an RFC 1483 LLC-encapsulated ATM frame.
  47  */
  48 static void
  49 atm_llc_print(const u_char *p, int length, int caplen)
  50 {
  51         struct ether_header ehdr;
  52         u_short ether_type;
  53         u_short extracted_ethertype;
  54
  55         ether_type = p[6] << 8 | p[7];
  56
  57         /*
  58          * Fake up an Ethernet header for the benefit of printers that
  59          * insist on "packetp" pointing to an Ethernet header.
  60          */
  61         memset(&ehdr, '\0', sizeof ehdr);
  62
  63         /*
  64          * Some printers want to get back at the ethernet addresses.
  65          * Rather than pass it all the way down, we set this global.
  66          *
  67          * Actually, the only printers that use packetp are print-arp.c
  68          * and print-bootp.c, and they assume that packetp points to an
  69          * Ethernet header.  The right thing to do is to fix them to know
  70          * which link type is in use when they excavate. XXX
  71          */
  72         packetp = (u_char *)&ehdr;
  73
  74         if (!llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
  75             &extracted_ethertype)) {
  76                 /* ether_type not known, print raw packet */
  77                 if (extracted_ethertype) {
  78                         printf("(LLC %s) ",
  79                 etherproto_string(htons(extracted_ethertype)));
  80                 }
  81                 if (!xflag && !qflag)
  82                         default_print(p, caplen);
  83         }
  84 }
  85
  86 /*
  87  * This is the top level routine of the printer.  'p' is the points
  88  * to the LLC/SNAP header of the packet, 'tvp' is the timestamp,
  89  * 'length' is the length of the packet off the wire, and 'caplen'
  90  * is the number of bytes actually captured.
  91  */
  92 void
  93 atm_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  94 {
  95         u_int caplen = h->caplen;
  96         u_int length = h->len;
  97
  98         ++infodelay;
  99         ts_print(&h->ts);
 100
 101         if (caplen < 8) {
 102                 printf("[|atm]");
 103                 goto out;
 104         }
 105
 106         /*
 107          * Some printers want to check that they're not walking off the
 108          * end of the packet.
 109          * Rather than pass it all the way down, we set this global.
 110          */
 111         snapend = p + caplen;
 112
 113         if (p[0] != 0xaa || p[1] != 0xaa || p[2] != 0x03) {
 114                 /*
 115                  * XXX - assume 802.6 MAC header from Fore driver.
 116                  * XXX - should we also assume it's not a MAC header
 117                  * if it begins with 0xfe 0xfe 0x03, for RFC 2684
 118                  * routed NLPID-formatted PDUs?
 119                  */
 120                 if (eflag)
 121                         printf("%04x%04x %04x%04x ",
 122                                p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3],
 123                                p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7],
 124                                p[8] << 24 | p[9] << 16 | p[10] << 8 | p[11],
 125                                p[12] << 24 | p[13] << 16 | p[14] << 8 | p[15]);
 126                 p += 20;
 127                 length -= 20;
 128                 caplen -= 20;
 129         }
 130         atm_llc_print(p, length, caplen);
 131         if (xflag)
 132                 default_print(p, caplen);
 133  out:
 134         putchar('\n');
 135 }
 136
 137 /*
 138  * ATM signalling.
 139  */
 140 static struct tok msgtype2str[] = {
 141         { CALL_PROCEED,         "Call_proceeding" },
 142         { CONNECT,              "Connect" },
 143         { CONNECT_ACK,          "Connect_ack" },
 144         { SETUP,                "Setup" },
 145         { RELEASE,              "Release" },
 146         { RELEASE_DONE,         "Release_complete" },
 147         { RESTART,              "Restart" },
 148         { RESTART_ACK,          "Restart_ack" },
 149         { STATUS,               "Status" },
 150         { STATUS_ENQ,           "Status_enquiry" },
 151         { ADD_PARTY,            "Add_party" },
 152         { ADD_PARTY_ACK,        "Add_party_ack" },
 153         { ADD_PARTY_REJ,        "Add_party_reject" },
 154         { DROP_PARTY,           "Drop_party" },
 155         { DROP_PARTY_ACK,       "Drop_party_ack" },
 156         { 0,                    NULL }
 157 };
 158
 159 static void
 160 sig_print(const u_char *p, int caplen)
 161 {
 162         bpf_u_int32 call_ref;
 163
 164         if (caplen < PROTO_POS) {
 165                 printf("[|atm]");
 166                 return;
 167         }
 168         if (p[PROTO_POS] == Q2931) {
 169                 /*
 170                  * protocol:Q.2931 for User to Network Interface
 171                  * (UNI 3.1) signalling
 172                  */
 173                 printf("Q.2931");
 174                 if (caplen < MSG_TYPE_POS) {
 175                         printf(" [|atm]");
 176                         return;
 177                 }
 178                 printf(":%s ",
 179                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 180
 181                 if (caplen < CALL_REF_POS+3) {
 182                         printf("[|atm]");
 183                         return;
 184                 }
 185                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 186                 printf("CALL_REF:0x%06x", call_ref);
 187         } else {
 188                 /* SCCOP with some unknown protocol atop it */
 189                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 190         }
 191 }
 192
 193 /*
 194  * Print an ATM PDU (such as an AAL5 PDU).
 195  */
 196 void
 197 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 198     u_int caplen)
 199 {
 200         if (eflag)
 201                 printf("VPI:%u VCI:%u ", vpi, vci);
 202
 203         /*
 204          * Some printers want to check that they're not walking off the
 205          * end of the packet.
 206          * Rather than pass it all the way down, we set this global.
 207          */
 208         snapend = p + caplen;
 209
 210         if (vpi == 0) {
 211                 switch (vci) {
 212
 213                 case PPC:
 214                         sig_print(p, caplen);
 215                         goto out;
 216
 217                 case BCC:
 218                         printf("broadcast sig: ");
 219                         goto out;
 220
 221                 case OAMF4SC:
 222                         printf("oamF4(segment): ");
 223                         goto out;
 224
 225                 case OAMF4EC:
 226                         printf("oamF4(end): ");
 227                         goto out;
 228
 229                 case METAC:
 230                         printf("meta: ");
 231                         goto out;
 232
 233                 case ILMIC:
 234                         printf("ilmi: ");
 235                         snmp_print(p, length);
 236                         goto out;
 237                 }
 238         }
 239
 240         switch (traftype) {
 241
 242         case ATM_LLC:
 243         default:
 244                 /*
 245                  * Assumes traffic is LLC if unknown.
 246                  */
 247                 atm_llc_print(p, length, caplen);
 248                 break;
 249
 250         case ATM_LANE:
 251                 lane_print(p, length, caplen);
 252                 break;
 253         }
 254
 255 out:
 256         if (xflag)
 257                 default_print(p, caplen);
 258 }