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 1.24 2002-07-11 09:17:23 guy Exp $ (LBL)";
  24 #endif
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <sys/param.h>
  31 #include <sys/time.h>
  32 #include <sys/socket.h>
  33
  34 #include <netinet/in.h>
  35
  36 #include <stdio.h>
  37 #include <pcap.h>
  38 #include <string.h>
  39
  40 #include "interface.h"
  41 #include "extract.h"
  42 #include "addrtoname.h"
  43 #include "ethertype.h"
  44 #include "atm.h"
  45 #include "atmuni31.h"
  46
  47 #include "ether.h"
  48
  49 /*
  50  * Print an RFC 1483 LLC-encapsulated ATM frame.
  51  */
  52 static void
  53 atm_llc_print(const u_char *p, int length, int caplen)
  54 {
  55         struct ether_header ehdr;
  56         u_short ether_type;
  57         u_short extracted_ethertype;
  58
  59         ether_type = p[6] << 8 | p[7];
  60
  61         /*
  62          * Fake up an Ethernet header for the benefit of printers that
  63          * insist on "packetp" pointing to an Ethernet header.
  64          */
  65         memset(&ehdr, '\0', sizeof ehdr);
  66
  67         /*
  68          * Some printers want to get back at the ethernet addresses.
  69          * Rather than pass it all the way down, we set this global.
  70          *
  71          * Actually, the only printers that use packetp are print-arp.c
  72          * and print-bootp.c, and they assume that packetp points to an
  73          * Ethernet header.  The right thing to do is to fix them to know
  74          * which link type is in use when they excavate. XXX
  75          */
  76         packetp = (u_char *)&ehdr;
  77
  78         if (!llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
  79             &extracted_ethertype)) {
  80                 /* ether_type not known, print raw packet */
  81                 if (extracted_ethertype) {
  82                         printf("(LLC %s) ",
  83                 etherproto_string(htons(extracted_ethertype)));
  84                 }
  85                 if (!xflag && !qflag)
  86                         default_print(p, caplen);
  87         }
  88 }
  89
  90 /*
  91  * This is the top level routine of the printer.  'p' is the points
  92  * to the LLC/SNAP header of the packet, 'tvp' is the timestamp,
  93  * 'length' is the length of the packet off the wire, and 'caplen'
  94  * is the number of bytes actually captured.
  95  */
  96 void
  97 atm_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  98 {
  99         u_int caplen = h->caplen;
 100         u_int length = h->len;
 101
 102         ++infodelay;
 103         ts_print(&h->ts);
 104
 105         if (caplen < 8) {
 106                 printf("[|atm]");
 107                 goto out;
 108         }
 109
 110         /*
 111          * Some printers want to check that they're not walking off the
 112          * end of the packet.
 113          * Rather than pass it all the way down, we set this global.
 114          */
 115         snapend = p + caplen;
 116
 117         if (p[0] != 0xaa || p[1] != 0xaa || p[2] != 0x03) {
 118                 /*
 119                  * XXX - assume 802.6 MAC header from Fore driver.
 120                  * XXX - should we also assume it's not a MAC header
 121                  * if it begins with 0xfe 0xfe 0x03, for RFC 2684
 122                  * routed NLPID-formatted PDUs?
 123                  */
 124                 if (eflag)
 125                         printf("%04x%04x %04x%04x ",
 126                                p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3],
 127                                p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7],
 128                                p[8] << 24 | p[9] << 16 | p[10] << 8 | p[11],
 129                                p[12] << 24 | p[13] << 16 | p[14] << 8 | p[15]);
 130                 p += 20;
 131                 length -= 20;
 132                 caplen -= 20;
 133         }
 134         atm_llc_print(p, length, caplen);
 135         if (xflag)
 136                 default_print(p, caplen);
 137  out:
 138         putchar('\n');
 139 }
 140
 141 /*
 142  * ATM signalling.
 143  */
 144 static struct tok msgtype2str[] = {
 145         { CALL_PROCEED,         "Call_proceeding" },
 146         { CONNECT,              "Connect" },
 147         { CONNECT_ACK,          "Connect_ack" },
 148         { SETUP,                "Setup" },
 149         { RELEASE,              "Release" },
 150         { RELEASE_DONE,         "Release_complete" },
 151         { RESTART,              "Restart" },
 152         { RESTART_ACK,          "Restart_ack" },
 153         { STATUS,               "Status" },
 154         { STATUS_ENQ,           "Status_enquiry" },
 155         { ADD_PARTY,            "Add_party" },
 156         { ADD_PARTY_ACK,        "Add_party_ack" },
 157         { ADD_PARTY_REJ,        "Add_party_reject" },
 158         { DROP_PARTY,           "Drop_party" },
 159         { DROP_PARTY_ACK,       "Drop_party_ack" },
 160         { 0,                    NULL }
 161 };
 162
 163 static void
 164 sig_print(const u_char *p, int caplen)
 165 {
 166         bpf_u_int32 call_ref;
 167
 168         if (caplen < PROTO_POS) {
 169                 printf("[|atm]");
 170                 return;
 171         }
 172         if (p[PROTO_POS] == Q2931) {
 173                 /*
 174                  * protocol:Q.2931 for User to Network Interface
 175                  * (UNI 3.1) signalling
 176                  */
 177                 printf("Q.2931");
 178                 if (caplen < MSG_TYPE_POS) {
 179                         printf(" [|atm]");
 180                         return;
 181                 }
 182                 printf(":%s ",
 183                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 184
 185                 if (caplen < CALL_REF_POS+3) {
 186                         printf("[|atm]");
 187                         return;
 188                 }
 189                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 190                 printf("CALL_REF:0x%06x", call_ref);
 191         } else {
 192                 /* SCCOP with some unknown protocol atop it */
 193                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 194         }
 195 }
 196
 197 /*
 198  * Print an ATM PDU (such as an AAL5 PDU).
 199  */
 200 void
 201 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 202     u_int caplen)
 203 {
 204         if (eflag)
 205                 printf("VPI:%u VCI:%u ", vpi, vci);
 206
 207         /*
 208          * Some printers want to check that they're not walking off the
 209          * end of the packet.
 210          * Rather than pass it all the way down, we set this global.
 211          */
 212         snapend = p + caplen;
 213
 214         if (vpi == 0) {
 215                 switch (vci) {
 216
 217                 case PPC:
 218                         sig_print(p, caplen);
 219                         goto out;
 220
 221                 case BCC:
 222                         printf("broadcast sig: ");
 223                         goto out;
 224
 225                 case OAMF4SC:
 226                         printf("oamF4(segment): ");
 227                         goto out;
 228
 229                 case OAMF4EC:
 230                         printf("oamF4(end): ");
 231                         goto out;
 232
 233                 case METAC:
 234                         printf("meta: ");
 235                         goto out;
 236
 237                 case ILMIC:
 238                         printf("ilmi: ");
 239                         snmp_print(p, length);
 240                         goto out;
 241                 }
 242         }
 243
 244         switch (traftype) {
 245
 246         case ATM_LLC:
 247         default:
 248                 /*
 249                  * Assumes traffic is LLC if unknown.
 250                  */
 251                 atm_llc_print(p, length, caplen);
 252                 break;
 253
 254         case ATM_LANE:
 255                 lane_print(p, length, caplen);
 256                 break;
 257         }
 258
 259 out:
 260         if (xflag)
 261                 default_print(p, caplen);
 262 }