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

   1 /*
   2  * Copyright (c) 2007-2011 Grégoire Henry, Juliusz Chroboczek
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  * 3. Neither the name of the project nor the names of its contributors
  13  *    may be used to endorse or promote products derived from this software
  14  *    without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <netdissect-stdinc.h>
  34
  35 #include <stdio.h>
  36 #include <string.h>
  37
  38 #include "netdissect.h"
  39 #include "addrtoname.h"
  40 #include "extract.h"
  41
  42 static const char tstr[] = "[|babel]";
  43
  44 static void babel_print_v2(netdissect_options *, const u_char *cp, u_int length);
  45
  46 void
  47 babel_print(netdissect_options *ndo,
  48             const u_char *cp, u_int length)
  49 {
  50     ND_PRINT((ndo, "babel"));
  51
  52     ND_TCHECK2(*cp, 4);
  53
  54     if(cp[0] != 42) {
  55         ND_PRINT((ndo, " invalid header"));
  56         return;
  57     } else {
  58         ND_PRINT((ndo, " %d", cp[1]));
  59     }
  60
  61     switch(cp[1]) {
  62     case 2:
  63         babel_print_v2(ndo, cp, length);
  64         break;
  65     default:
  66         ND_PRINT((ndo, " unknown version"));
  67         break;
  68     }
  69
  70     return;
  71
  72  trunc:
  73     ND_PRINT((ndo, " %s", tstr));
  74     return;
  75 }
  76
  77 /* TLVs */
  78 #define MESSAGE_PAD1 0
  79 #define MESSAGE_PADN 1
  80 #define MESSAGE_ACK_REQ 2
  81 #define MESSAGE_ACK 3
  82 #define MESSAGE_HELLO 4
  83 #define MESSAGE_IHU 5
  84 #define MESSAGE_ROUTER_ID 6
  85 #define MESSAGE_NH 7
  86 #define MESSAGE_UPDATE 8
  87 #define MESSAGE_REQUEST 9
  88 #define MESSAGE_MH_REQUEST 10
  89 #define MESSAGE_TSPC 11
  90 #define MESSAGE_HMAC 12
  91 #define MESSAGE_UPDATE_SRC_SPECIFIC 13
  92 #define MESSAGE_REQUEST_SRC_SPECIFIC 14
  93 #define MESSAGE_MH_REQUEST_SRC_SPECIFIC 15
  94
  95 /* sub-TLVs */
  96 #define MESSAGE_SUB_PAD1 0
  97 #define MESSAGE_SUB_PADN 1
  98 #define MESSAGE_SUB_DIVERSITY 2
  99 #define MESSAGE_SUB_TIMESTAMP 3
 100
 101 /* Diversity sub-TLV channel codes */
 102 static const struct tok diversity_str[] = {
 103     { 0,   "reserved" },
 104     { 255, "all"      },
 105     { 0, NULL }
 106 };
 107
 108 static const char *
 109 format_id(const u_char *id)
 110 {
 111     static char buf[25];
 112     snprintf(buf, 25, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
 113              id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7]);
 114     buf[24] = '\0';
 115     return buf;
 116 }
 117
 118 static const unsigned char v4prefix[16] =
 119     {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
 120
 121 static const char *
 122 format_prefix(netdissect_options *ndo, const u_char *prefix, unsigned char plen)
 123 {
 124     static char buf[50];
 125     if(plen >= 96 && memcmp(prefix, v4prefix, 12) == 0)
 126         snprintf(buf, 50, "%s/%u", ipaddr_string(ndo, prefix + 12), plen - 96);
 127     else
 128         snprintf(buf, 50, "%s/%u", ip6addr_string(ndo, prefix), plen);
 129     buf[49] = '\0';
 130     return buf;
 131 }
 132
 133 static const char *
 134 format_address(netdissect_options *ndo, const u_char *prefix)
 135 {
 136     if(memcmp(prefix, v4prefix, 12) == 0)
 137         return ipaddr_string(ndo, prefix + 12);
 138     else
 139         return ip6addr_string(ndo, prefix);
 140 }
 141
 142 static const char *
 143 format_interval(const uint16_t i)
 144 {
 145     static char buf[sizeof("000.00s")];
 146
 147     if (i == 0)
 148         return "0.0s (bogus)";
 149     snprintf(buf, sizeof(buf), "%u.%02us", i / 100, i % 100);
 150     return buf;
 151 }
 152
 153 static const char *
 154 format_interval_update(const uint16_t i)
 155 {
 156     return i == 0xFFFF ? "infinity" : format_interval(i);
 157 }
 158
 159 static const char *
 160 format_timestamp(const uint32_t i)
 161 {
 162     static char buf[sizeof("0000.000000s")];
 163     snprintf(buf, sizeof(buf), "%u.%06us", i / 1000000, i % 1000000);
 164     return buf;
 165 }
 166
 167 /* Return number of octets consumed from the input buffer (not the prefix length
 168  * in bytes), or -1 for encoding error. */
 169 static int
 170 network_prefix(int ae, int plen, unsigned int omitted,
 171                const unsigned char *p, const unsigned char *dp,
 172                unsigned int len, unsigned char *p_r)
 173 {
 174     unsigned pb;
 175     unsigned char prefix[16];
 176     int consumed = 0;
 177
 178     if(plen >= 0)
 179         pb = (plen + 7) / 8;
 180     else if(ae == 1)
 181         pb = 4;
 182     else
 183         pb = 16;
 184
 185     if(pb > 16)
 186         return -1;
 187
 188     memset(prefix, 0, 16);
 189
 190     switch(ae) {
 191     case 0: break;
 192     case 1:
 193         if(omitted > 4 || pb > 4 || (pb > omitted && len < pb - omitted))
 194             return -1;
 195         memcpy(prefix, v4prefix, 12);
 196         if(omitted) {
 197             if (dp == NULL) return -1;
 198             memcpy(prefix, dp, 12 + omitted);
 199         }
 200         if(pb > omitted) {
 201             memcpy(prefix + 12 + omitted, p, pb - omitted);
 202             consumed = pb - omitted;
 203         }
 204         break;
 205     case 2:
 206         if(omitted > 16 || (pb > omitted && len < pb - omitted))
 207             return -1;
 208         if(omitted) {
 209             if (dp == NULL) return -1;
 210             memcpy(prefix, dp, omitted);
 211         }
 212         if(pb > omitted) {
 213             memcpy(prefix + omitted, p, pb - omitted);
 214             consumed = pb - omitted;
 215         }
 216         break;
 217     case 3:
 218         if(pb > 8 && len < pb - 8) return -1;
 219         prefix[0] = 0xfe;
 220         prefix[1] = 0x80;
 221         if(pb > 8) {
 222             memcpy(prefix + 8, p, pb - 8);
 223             consumed = pb - 8;
 224         }
 225         break;
 226     default:
 227         return -1;
 228     }
 229
 230     memcpy(p_r, prefix, 16);
 231     return consumed;
 232 }
 233
 234 static int
 235 network_address(int ae, const unsigned char *a, unsigned int len,
 236                 unsigned char *a_r)
 237 {
 238     return network_prefix(ae, -1, 0, a, NULL, len, a_r);
 239 }
 240
 241 /*
 242  * Sub-TLVs consume the "extra data" of Babel TLVs (see Section 4.3 of RFC6126),
 243  * their encoding is similar to the encoding of TLVs, but the type namespace is
 244  * different:
 245  *
 246  * o Type 0 stands for Pad1 sub-TLV with the same encoding as the Pad1 TLV.
 247  * o Type 1 stands for PadN sub-TLV with the same encoding as the PadN TLV.
 248  * o Type 2 stands for Diversity sub-TLV, which propagates diversity routing
 249  *   data. Its body is a variable-length sequence of 8-bit unsigned integers,
 250  *   each representing per-hop number of interferring radio channel for the
 251  *   prefix. Channel 0 is invalid and must not be used in the sub-TLV, channel
 252  *   255 interferes with any other channel.
 253  * o Type 3 stands for Timestamp sub-TLV, used to compute RTT between
 254  *   neighbours. In the case of a Hello TLV, the body stores a 32-bits
 255  *   timestamp, while in the case of a IHU TLV, two 32-bits timestamps are
 256  *   stored.
 257  *
 258  * Sub-TLV types 0 and 1 are valid for any TLV type, whether sub-TLV type 2 is
 259  * only valid for TLV type 8 (Update). Note that within an Update TLV a missing
 260  * Diversity sub-TLV is not the same as a Diversity sub-TLV with an empty body.
 261  * The former would mean a lack of any claims about the interference, and the
 262  * latter would state that interference is definitely absent.
 263  * A type 3 sub-TLV is valid both for Hello and IHU TLVs, though the exact
 264  * semantic of the sub-TLV is different in each case.
 265  */
 266 static void
 267 subtlvs_print(netdissect_options *ndo,
 268               const u_char *cp, const u_char *ep, const uint8_t tlv_type)
 269 {
 270     uint8_t subtype, sublen;
 271     const char *sep;
 272     uint32_t t1, t2;
 273
 274     while (cp < ep) {
 275         subtype = *cp++;
 276         if(subtype == MESSAGE_SUB_PAD1) {
 277             ND_PRINT((ndo, " sub-pad1"));
 278             continue;
 279         }
 280         if(cp == ep)
 281             goto invalid;
 282         sublen = *cp++;
 283         if(cp + sublen > ep)
 284             goto invalid;
 285
 286         switch(subtype) {
 287         case MESSAGE_SUB_PADN:
 288             ND_PRINT((ndo, " sub-padn"));
 289             cp += sublen;
 290             break;
 291         case MESSAGE_SUB_DIVERSITY:
 292             ND_PRINT((ndo, " sub-diversity"));
 293             if (sublen == 0) {
 294                 ND_PRINT((ndo, " empty"));
 295                 break;
 296             }
 297             sep = " ";
 298             while(sublen--) {
 299                 ND_PRINT((ndo, "%s%s", sep, tok2str(diversity_str, "%u", *cp++)));
 300                 sep = "-";
 301             }
 302             if(tlv_type != MESSAGE_UPDATE &&
 303                tlv_type != MESSAGE_UPDATE_SRC_SPECIFIC)
 304                 ND_PRINT((ndo, " (bogus)"));
 305             break;
 306         case MESSAGE_SUB_TIMESTAMP:
 307             ND_PRINT((ndo, " sub-timestamp"));
 308             if(tlv_type == MESSAGE_HELLO) {
 309                 if(sublen < 4)
 310                     goto invalid;
 311                 t1 = EXTRACT_32BITS(cp);
 312                 ND_PRINT((ndo, " %s", format_timestamp(t1)));
 313             } else if(tlv_type == MESSAGE_IHU) {
 314                 if(sublen < 8)
 315                     goto invalid;
 316                 t1 = EXTRACT_32BITS(cp);
 317                 ND_PRINT((ndo, " %s", format_timestamp(t1)));
 318                 t2 = EXTRACT_32BITS(cp + 4);
 319                 ND_PRINT((ndo, "|%s", format_timestamp(t2)));
 320             } else
 321                 ND_PRINT((ndo, " (bogus)"));
 322             cp += sublen;
 323             break;
 324         default:
 325             ND_PRINT((ndo, " sub-unknown-0x%02x", subtype));
 326             cp += sublen;
 327         } /* switch */
 328     } /* while */
 329     return;
 330
 331  invalid:
 332     ND_PRINT((ndo, "%s", istr));
 333 }
 334
 335 #define ICHECK(i, l) \
 336         if ((i) + (l) > bodylen || (i) + (l) > length) goto invalid;
 337
 338 static void
 339 babel_print_v2(netdissect_options *ndo,
 340                const u_char *cp, u_int length)
 341 {
 342     u_int i;
 343     u_short bodylen;
 344     u_char v4_prefix[16] =
 345         {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
 346     u_char v6_prefix[16] = {0};
 347
 348     ND_TCHECK2(*cp, 4);
 349     if (length < 4)
 350         goto invalid;
 351     bodylen = EXTRACT_16BITS(cp + 2);
 352     ND_PRINT((ndo, " (%u)", bodylen));
 353
 354     /* Process the TLVs in the body */
 355     i = 0;
 356     while(i < bodylen) {
 357         const u_char *message;
 358         u_int type, len;
 359
 360         message = cp + 4 + i;
 361
 362         ND_TCHECK2(*message, 1);
 363         if((type = message[0]) == MESSAGE_PAD1) {
 364             ND_PRINT((ndo, ndo->ndo_vflag ? "\n\tPad 1" : " pad1"));
 365             i += 1;
 366             continue;
 367         }
 368
 369         ND_TCHECK2(*message, 2);
 370         ICHECK(i, 2);
 371         len = message[1];
 372
 373         ND_TCHECK2(*message, 2 + len);
 374         ICHECK(i, 2 + len);
 375
 376         switch(type) {
 377         case MESSAGE_PADN: {
 378             if (!ndo->ndo_vflag)
 379                 ND_PRINT((ndo, " padN"));
 380             else
 381                 ND_PRINT((ndo, "\n\tPad %d", len + 2));
 382         }
 383             break;
 384
 385         case MESSAGE_ACK_REQ: {
 386             u_short nonce, interval;
 387             if (!ndo->ndo_vflag)
 388                 ND_PRINT((ndo, " ack-req"));
 389             else {
 390                 ND_PRINT((ndo, "\n\tAcknowledgment Request "));
 391                 if(len < 6) goto invalid;
 392                 nonce = EXTRACT_16BITS(message + 4);
 393                 interval = EXTRACT_16BITS(message + 6);
 394                 ND_PRINT((ndo, "%04x %s", nonce, format_interval(interval)));
 395             }
 396         }
 397             break;
 398
 399         case MESSAGE_ACK: {
 400             u_short nonce;
 401             if (!ndo->ndo_vflag)
 402                 ND_PRINT((ndo, " ack"));
 403             else {
 404                 ND_PRINT((ndo, "\n\tAcknowledgment "));
 405                 if(len < 2) goto invalid;
 406                 nonce = EXTRACT_16BITS(message + 2);
 407                 ND_PRINT((ndo, "%04x", nonce));
 408             }
 409         }
 410             break;
 411
 412         case MESSAGE_HELLO:  {
 413             u_short seqno, interval;
 414             if (!ndo->ndo_vflag)
 415                 ND_PRINT((ndo, " hello"));
 416             else {
 417                 ND_PRINT((ndo, "\n\tHello "));
 418                 if(len < 6) goto invalid;
 419                 seqno = EXTRACT_16BITS(message + 4);
 420                 interval = EXTRACT_16BITS(message + 6);
 421                 ND_PRINT((ndo, "seqno %u interval %s", seqno, format_interval(interval)));
 422                 /* Extra data. */
 423                 if(len > 6)
 424                     subtlvs_print(ndo, message + 8, message + 2 + len, type);
 425             }
 426         }
 427             break;
 428
 429         case MESSAGE_IHU: {
 430             unsigned short txcost, interval;
 431             if (!ndo->ndo_vflag)
 432                 ND_PRINT((ndo, " ihu"));
 433             else {
 434                 u_char address[16];
 435                 int rc;
 436                 ND_PRINT((ndo, "\n\tIHU "));
 437                 if(len < 6) goto invalid;
 438                 txcost = EXTRACT_16BITS(message + 4);
 439                 interval = EXTRACT_16BITS(message + 6);
 440                 rc = network_address(message[2], message + 8, len - 6, address);
 441                 if(rc < 0) { ND_PRINT((ndo, "%s", tstr)); break; }
 442                 ND_PRINT((ndo, "%s txcost %u interval %s",
 443                        format_address(ndo, address), txcost, format_interval(interval)));
 444                 /* Extra data. */
 445                 if((u_int)rc < len - 6)
 446                     subtlvs_print(ndo, message + 8 + rc, message + 2 + len,
 447                                   type);
 448             }
 449         }
 450             break;
 451
 452         case MESSAGE_ROUTER_ID: {
 453             if (!ndo->ndo_vflag)
 454                 ND_PRINT((ndo, " router-id"));
 455             else {
 456                 ND_PRINT((ndo, "\n\tRouter Id"));
 457                 if(len < 10) goto invalid;
 458                 ND_PRINT((ndo, " %s", format_id(message + 4)));
 459             }
 460         }
 461             break;
 462
 463         case MESSAGE_NH: {
 464             if (!ndo->ndo_vflag)
 465                 ND_PRINT((ndo, " nh"));
 466             else {
 467                 int rc;
 468                 u_char nh[16];
 469                 ND_PRINT((ndo, "\n\tNext Hop"));
 470                 if(len < 2) goto invalid;
 471                 rc = network_address(message[2], message + 4, len - 2, nh);
 472                 if(rc < 0) goto invalid;
 473                 ND_PRINT((ndo, " %s", format_address(ndo, nh)));
 474             }
 475         }
 476             break;
 477
 478         case MESSAGE_UPDATE: {
 479             if (!ndo->ndo_vflag) {
 480                 ND_PRINT((ndo, " update"));
 481                 if(len < 1)
 482                     ND_PRINT((ndo, "/truncated"));
 483                 else
 484                     ND_PRINT((ndo, "%s%s%s",
 485                            (message[3] & 0x80) ? "/prefix": "",
 486                            (message[3] & 0x40) ? "/id" : "",
 487                            (message[3] & 0x3f) ? "/unknown" : ""));
 488             } else {
 489                 u_short interval, seqno, metric;
 490                 u_char plen;
 491                 int rc;
 492                 u_char prefix[16];
 493                 ND_PRINT((ndo, "\n\tUpdate"));
 494                 if(len < 10) goto invalid;
 495                 plen = message[4] + (message[2] == 1 ? 96 : 0);
 496                 rc = network_prefix(message[2], message[4], message[5],
 497                                     message + 12,
 498                                     message[2] == 1 ? v4_prefix : v6_prefix,
 499                                     len - 10, prefix);
 500                 if(rc < 0) goto invalid;
 501                 interval = EXTRACT_16BITS(message + 6);
 502                 seqno = EXTRACT_16BITS(message + 8);
 503                 metric = EXTRACT_16BITS(message + 10);
 504                 ND_PRINT((ndo, "%s%s%s %s metric %u seqno %u interval %s",
 505                        (message[3] & 0x80) ? "/prefix": "",
 506                        (message[3] & 0x40) ? "/id" : "",
 507                        (message[3] & 0x3f) ? "/unknown" : "",
 508                        format_prefix(ndo, prefix, plen),
 509                        metric, seqno, format_interval_update(interval)));
 510                 if(message[3] & 0x80) {
 511                     if(message[2] == 1)
 512                         memcpy(v4_prefix, prefix, 16);
 513                     else
 514                         memcpy(v6_prefix, prefix, 16);
 515                 }
 516                 /* extra data? */
 517                 if((u_int)rc < len - 10)
 518                     subtlvs_print(ndo, message + 12 + rc, message + 2 + len, type);
 519             }
 520         }
 521             break;
 522
 523         case MESSAGE_REQUEST: {
 524             if (!ndo->ndo_vflag)
 525                 ND_PRINT((ndo, " request"));
 526             else {
 527                 int rc;
 528                 u_char prefix[16], plen;
 529                 ND_PRINT((ndo, "\n\tRequest "));
 530                 if(len < 2) goto invalid;
 531                 plen = message[3] + (message[2] == 1 ? 96 : 0);
 532                 rc = network_prefix(message[2], message[3], 0,
 533                                     message + 4, NULL, len - 2, prefix);
 534                 if(rc < 0) goto invalid;
 535                 ND_PRINT((ndo, "for %s",
 536                        message[2] == 0 ? "any" : format_prefix(ndo, prefix, plen)));
 537             }
 538         }
 539             break;
 540
 541         case MESSAGE_MH_REQUEST : {
 542             if (!ndo->ndo_vflag)
 543                 ND_PRINT((ndo, " mh-request"));
 544             else {
 545                 int rc;
 546                 u_short seqno;
 547                 u_char prefix[16], plen;
 548                 ND_PRINT((ndo, "\n\tMH-Request "));
 549                 if(len < 14) goto invalid;
 550                 seqno = EXTRACT_16BITS(message + 4);
 551                 rc = network_prefix(message[2], message[3], 0,
 552                                     message + 16, NULL, len - 14, prefix);
 553                 if(rc < 0) goto invalid;
 554                 plen = message[3] + (message[2] == 1 ? 96 : 0);
 555                 ND_PRINT((ndo, "(%u hops) for %s seqno %u id %s",
 556                        message[6], format_prefix(ndo, prefix, plen),
 557                        seqno, format_id(message + 8)));
 558             }
 559         }
 560             break;
 561         case MESSAGE_TSPC :
 562             if (!ndo->ndo_vflag)
 563                 ND_PRINT((ndo, " tspc"));
 564             else {
 565                 ND_PRINT((ndo, "\n\tTS/PC "));
 566                 if(len < 6) goto invalid;
 567                 ND_PRINT((ndo, "timestamp %u packetcounter %u", EXTRACT_32BITS (message + 4),
 568                        EXTRACT_16BITS(message + 2)));
 569             }
 570             break;
 571         case MESSAGE_HMAC : {
 572             if (!ndo->ndo_vflag)
 573                 ND_PRINT((ndo, " hmac"));
 574             else {
 575                 unsigned j;
 576                 ND_PRINT((ndo, "\n\tHMAC "));
 577                 if(len < 18) goto invalid;
 578                 ND_PRINT((ndo, "key-id %u digest-%u ", EXTRACT_16BITS(message + 2), len - 2));
 579                 for (j = 0; j < len - 2; j++)
 580                     ND_PRINT((ndo, "%02X", message[4 + j]));
 581             }
 582         }
 583             break;
 584
 585         case MESSAGE_UPDATE_SRC_SPECIFIC : {
 586             if(!ndo->ndo_vflag) {
 587                 ND_PRINT((ndo, " ss-update"));
 588             } else {
 589                 u_char prefix[16], src_prefix[16];
 590                 u_short interval, seqno, metric;
 591                 u_char ae, plen, src_plen, omitted;
 592                 int rc;
 593                 int parsed_len = 10;
 594                 ND_PRINT((ndo, "\n\tSS-Update"));
 595                 if(len < 10) goto invalid;
 596                 ae = message[2];
 597                 src_plen = message[3];
 598                 plen = message[4];
 599                 omitted = message[5];
 600                 interval = EXTRACT_16BITS(message + 6);
 601                 seqno = EXTRACT_16BITS(message + 8);
 602                 metric = EXTRACT_16BITS(message + 10);
 603                 rc = network_prefix(ae, plen, omitted, message + 2 + parsed_len,
 604                                     ae == 1 ? v4_prefix : v6_prefix,
 605                                     len - parsed_len, prefix);
 606                 if(rc < 0) goto invalid;
 607                 if(ae == 1)
 608                     plen += 96;
 609                 parsed_len += rc;
 610                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 611                                     NULL, len - parsed_len, src_prefix);
 612                 if(rc < 0) goto invalid;
 613                 if(ae == 1)
 614                     src_plen += 96;
 615                 parsed_len += rc;
 616
 617                 ND_PRINT((ndo, " %s from", format_prefix(ndo, prefix, plen)));
 618                 ND_PRINT((ndo, " %s metric %u seqno %u interval %s",
 619                           format_prefix(ndo, src_prefix, src_plen),
 620                           metric, seqno, format_interval_update(interval)));
 621                 /* extra data? */
 622                 if((u_int)parsed_len < len)
 623                     subtlvs_print(ndo, message + 2 + parsed_len,
 624                                   message + 2 + len, type);
 625             }
 626         }
 627             break;
 628
 629         case MESSAGE_REQUEST_SRC_SPECIFIC : {
 630             if(!ndo->ndo_vflag)
 631                 ND_PRINT((ndo, " ss-request"));
 632             else {
 633                 int rc, parsed_len = 3;
 634                 u_char ae, plen, src_plen, prefix[16], src_prefix[16];
 635                 ND_PRINT((ndo, "\n\tSS-Request "));
 636                 if(len < 3) goto invalid;
 637                 ae = message[2];
 638                 plen = message[3];
 639                 src_plen = message[4];
 640                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 641                                     NULL, len - parsed_len, prefix);
 642                 if(rc < 0) goto invalid;
 643                 if(ae == 1)
 644                     plen += 96;
 645                 parsed_len += rc;
 646                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 647                                     NULL, len - parsed_len, src_prefix);
 648                 if(rc < 0) goto invalid;
 649                 if(ae == 1)
 650                     src_plen += 96;
 651                 parsed_len += rc;
 652                 if(ae == 0) {
 653                     ND_PRINT((ndo, "for any"));
 654                 } else {
 655                     ND_PRINT((ndo, "for (%s, ", format_prefix(ndo, prefix, plen)));
 656                     ND_PRINT((ndo, "%s)", format_prefix(ndo, src_prefix, src_plen)));
 657                 }
 658             }
 659         }
 660             break;
 661
 662         case MESSAGE_MH_REQUEST_SRC_SPECIFIC : {
 663             if(!ndo->ndo_vflag)
 664                 ND_PRINT((ndo, " ss-mh-request"));
 665             else {
 666                 int rc, parsed_len = 14;
 667                 u_short seqno;
 668                 u_char ae, plen, src_plen, prefix[16], src_prefix[16], hopc;
 669                 const u_char *router_id = NULL;
 670                 ND_PRINT((ndo, "\n\tSS-MH-Request "));
 671                 if(len < 14) goto invalid;
 672                 ae = message[2];
 673                 plen = message[3];
 674                 seqno = EXTRACT_16BITS(message + 4);
 675                 hopc = message[6];
 676                 src_plen = message[7];
 677                 router_id = message + 8;
 678                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 679                                     NULL, len - parsed_len, prefix);
 680                 if(rc < 0) goto invalid;
 681                 if(ae == 1)
 682                     plen += 96;
 683                 parsed_len += rc;
 684                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 685                                     NULL, len - parsed_len, src_prefix);
 686                 if(rc < 0) goto invalid;
 687                 if(ae == 1)
 688                     src_plen += 96;
 689                 ND_PRINT((ndo, "(%u hops) for (%s, ",
 690                           hopc, format_prefix(ndo, prefix, plen)));
 691                 ND_PRINT((ndo, "%s) seqno %u id %s",
 692                           format_prefix(ndo, src_prefix, src_plen),
 693                           seqno, format_id(router_id)));
 694             }
 695         }
 696             break;
 697
 698         default:
 699             if (!ndo->ndo_vflag)
 700                 ND_PRINT((ndo, " unknown"));
 701             else
 702                 ND_PRINT((ndo, "\n\tUnknown message type %d", type));
 703         }
 704         i += len + 2;
 705     }
 706     return;
 707
 708  trunc:
 709     ND_PRINT((ndo, " %s", tstr));
 710     return;
 711
 712  invalid:
 713     ND_PRINT((ndo, "%s", istr));
 714     return;
 715 }