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 static const char istr[] = " (invalid)";
  44
  45 static void babel_print_v2(netdissect_options *, const u_char *cp, u_int length);
  46
  47 void
  48 babel_print(netdissect_options *ndo,
  49             const u_char *cp, u_int length)
  50 {
  51     ND_PRINT((ndo, "babel"));
  52
  53     ND_TCHECK2(*cp, 4);
  54
  55     if(cp[0] != 42) {
  56         ND_PRINT((ndo, " invalid header"));
  57         return;
  58     } else {
  59         ND_PRINT((ndo, " %d", cp[1]));
  60     }
  61
  62     switch(cp[1]) {
  63     case 2:
  64         babel_print_v2(ndo, cp, length);
  65         break;
  66     default:
  67         ND_PRINT((ndo, " unknown version"));
  68         break;
  69     }
  70
  71     return;
  72
  73  trunc:
  74     ND_PRINT((ndo, " %s", tstr));
  75     return;
  76 }
  77
  78 /* TLVs */
  79 #define MESSAGE_PAD1 0
  80 #define MESSAGE_PADN 1
  81 #define MESSAGE_ACK_REQ 2
  82 #define MESSAGE_ACK 3
  83 #define MESSAGE_HELLO 4
  84 #define MESSAGE_IHU 5
  85 #define MESSAGE_ROUTER_ID 6
  86 #define MESSAGE_NH 7
  87 #define MESSAGE_UPDATE 8
  88 #define MESSAGE_REQUEST 9
  89 #define MESSAGE_MH_REQUEST 10
  90 #define MESSAGE_TSPC 11
  91 #define MESSAGE_HMAC 12
  92 #define MESSAGE_UPDATE_SRC_SPECIFIC 13
  93 #define MESSAGE_REQUEST_SRC_SPECIFIC 14
  94 #define MESSAGE_MH_REQUEST_SRC_SPECIFIC 15
  95
  96 /* sub-TLVs */
  97 #define MESSAGE_SUB_PAD1 0
  98 #define MESSAGE_SUB_PADN 1
  99 #define MESSAGE_SUB_DIVERSITY 2
 100 #define MESSAGE_SUB_TIMESTAMP 3
 101
 102 /* Diversity sub-TLV channel codes */
 103 static const struct tok diversity_str[] = {
 104     { 0,   "reserved" },
 105     { 255, "all"      },
 106     { 0, NULL }
 107 };
 108
 109 static const char *
 110 format_id(const u_char *id)
 111 {
 112     static char buf[25];
 113     snprintf(buf, 25, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
 114              id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7]);
 115     buf[24] = '\0';
 116     return buf;
 117 }
 118
 119 static const unsigned char v4prefix[16] =
 120     {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
 121
 122 static const char *
 123 format_prefix(netdissect_options *ndo, const u_char *prefix, unsigned char plen)
 124 {
 125     static char buf[50];
 126     if(plen >= 96 && memcmp(prefix, v4prefix, 12) == 0)
 127         snprintf(buf, 50, "%s/%u", ipaddr_string(ndo, prefix + 12), plen - 96);
 128     else
 129         snprintf(buf, 50, "%s/%u", ip6addr_string(ndo, prefix), plen);
 130     buf[49] = '\0';
 131     return buf;
 132 }
 133
 134 static const char *
 135 format_address(netdissect_options *ndo, const u_char *prefix)
 136 {
 137     if(memcmp(prefix, v4prefix, 12) == 0)
 138         return ipaddr_string(ndo, prefix + 12);
 139     else
 140         return ip6addr_string(ndo, prefix);
 141 }
 142
 143 static const char *
 144 format_interval(const uint16_t i)
 145 {
 146     static char buf[sizeof("000.00s")];
 147
 148     if (i == 0)
 149         return "0.0s (bogus)";
 150     snprintf(buf, sizeof(buf), "%u.%02us", i / 100, i % 100);
 151     return buf;
 152 }
 153
 154 static const char *
 155 format_interval_update(const uint16_t i)
 156 {
 157     return i == 0xFFFF ? "infinity" : format_interval(i);
 158 }
 159
 160 static const char *
 161 format_timestamp(const uint32_t i)
 162 {
 163     static char buf[sizeof("0000.000000s")];
 164     snprintf(buf, sizeof(buf), "%u.%06us", i / 1000000, i % 1000000);
 165     return buf;
 166 }
 167
 168 /* Return number of octets consumed from the input buffer (not the prefix length
 169  * in bytes), or -1 for encoding error. */
 170 static int
 171 network_prefix(int ae, int plen, unsigned int omitted,
 172                const unsigned char *p, const unsigned char *dp,
 173                unsigned int len, unsigned char *p_r)
 174 {
 175     unsigned pb;
 176     unsigned char prefix[16];
 177     int consumed = 0;
 178
 179     if(plen >= 0)
 180         pb = (plen + 7) / 8;
 181     else if(ae == 1)
 182         pb = 4;
 183     else
 184         pb = 16;
 185
 186     if(pb > 16)
 187         return -1;
 188
 189     memset(prefix, 0, 16);
 190
 191     switch(ae) {
 192     case 0: break;
 193     case 1:
 194         if(omitted > 4 || pb > 4 || (pb > omitted && len < pb - omitted))
 195             return -1;
 196         memcpy(prefix, v4prefix, 12);
 197         if(omitted) {
 198             if (dp == NULL) return -1;
 199             memcpy(prefix, dp, 12 + omitted);
 200         }
 201         if(pb > omitted) {
 202             memcpy(prefix + 12 + omitted, p, pb - omitted);
 203             consumed = pb - omitted;
 204         }
 205         break;
 206     case 2:
 207         if(omitted > 16 || (pb > omitted && len < pb - omitted))
 208             return -1;
 209         if(omitted) {
 210             if (dp == NULL) return -1;
 211             memcpy(prefix, dp, omitted);
 212         }
 213         if(pb > omitted) {
 214             memcpy(prefix + omitted, p, pb - omitted);
 215             consumed = pb - omitted;
 216         }
 217         break;
 218     case 3:
 219         if(pb > 8 && len < pb - 8) return -1;
 220         prefix[0] = 0xfe;
 221         prefix[1] = 0x80;
 222         if(pb > 8) {
 223             memcpy(prefix + 8, p, pb - 8);
 224             consumed = pb - 8;
 225         }
 226         break;
 227     default:
 228         return -1;
 229     }
 230
 231     memcpy(p_r, prefix, 16);
 232     return consumed;
 233 }
 234
 235 static int
 236 network_address(int ae, const unsigned char *a, unsigned int len,
 237                 unsigned char *a_r)
 238 {
 239     return network_prefix(ae, -1, 0, a, NULL, len, a_r);
 240 }
 241
 242 /*
 243  * Sub-TLVs consume the "extra data" of Babel TLVs (see Section 4.3 of RFC6126),
 244  * their encoding is similar to the encoding of TLVs, but the type namespace is
 245  * different:
 246  *
 247  * o Type 0 stands for Pad1 sub-TLV with the same encoding as the Pad1 TLV.
 248  * o Type 1 stands for PadN sub-TLV with the same encoding as the PadN TLV.
 249  * o Type 2 stands for Diversity sub-TLV, which propagates diversity routing
 250  *   data. Its body is a variable-length sequence of 8-bit unsigned integers,
 251  *   each representing per-hop number of interferring radio channel for the
 252  *   prefix. Channel 0 is invalid and must not be used in the sub-TLV, channel
 253  *   255 interferes with any other channel.
 254  * o Type 3 stands for Timestamp sub-TLV, used to compute RTT between
 255  *   neighbours. In the case of a Hello TLV, the body stores a 32-bits
 256  *   timestamp, while in the case of a IHU TLV, two 32-bits timestamps are
 257  *   stored.
 258  *
 259  * Sub-TLV types 0 and 1 are valid for any TLV type, whether sub-TLV type 2 is
 260  * only valid for TLV type 8 (Update). Note that within an Update TLV a missing
 261  * Diversity sub-TLV is not the same as a Diversity sub-TLV with an empty body.
 262  * The former would mean a lack of any claims about the interference, and the
 263  * latter would state that interference is definitely absent.
 264  * A type 3 sub-TLV is valid both for Hello and IHU TLVs, though the exact
 265  * semantic of the sub-TLV is different in each case.
 266  */
 267 static void
 268 subtlvs_print(netdissect_options *ndo,
 269               const u_char *cp, const u_char *ep, const uint8_t tlv_type)
 270 {
 271     uint8_t subtype, sublen;
 272     const char *sep;
 273     uint32_t t1, t2;
 274
 275     while (cp < ep) {
 276         subtype = *cp++;
 277         if(subtype == MESSAGE_SUB_PAD1) {
 278             ND_PRINT((ndo, " sub-pad1"));
 279             continue;
 280         }
 281         if(cp == ep)
 282             goto invalid;
 283         sublen = *cp++;
 284         if(cp + sublen > ep)
 285             goto invalid;
 286
 287         switch(subtype) {
 288         case MESSAGE_SUB_PADN:
 289             ND_PRINT((ndo, " sub-padn"));
 290             cp += sublen;
 291             break;
 292         case MESSAGE_SUB_DIVERSITY:
 293             ND_PRINT((ndo, " sub-diversity"));
 294             if (sublen == 0) {
 295                 ND_PRINT((ndo, " empty"));
 296                 break;
 297             }
 298             sep = " ";
 299             while(sublen--) {
 300                 ND_PRINT((ndo, "%s%s", sep, tok2str(diversity_str, "%u", *cp++)));
 301                 sep = "-";
 302             }
 303             if(tlv_type != MESSAGE_UPDATE &&
 304                tlv_type != MESSAGE_UPDATE_SRC_SPECIFIC)
 305                 ND_PRINT((ndo, " (bogus)"));
 306             break;
 307         case MESSAGE_SUB_TIMESTAMP:
 308             ND_PRINT((ndo, " sub-timestamp"));
 309             if(tlv_type == MESSAGE_HELLO) {
 310                 if(sublen < 4)
 311                     goto invalid;
 312                 t1 = EXTRACT_32BITS(cp);
 313                 ND_PRINT((ndo, " %s", format_timestamp(t1)));
 314             } else if(tlv_type == MESSAGE_IHU) {
 315                 if(sublen < 8)
 316                     goto invalid;
 317                 t1 = EXTRACT_32BITS(cp);
 318                 ND_PRINT((ndo, " %s", format_timestamp(t1)));
 319                 t2 = EXTRACT_32BITS(cp + 4);
 320                 ND_PRINT((ndo, "|%s", format_timestamp(t2)));
 321             } else
 322                 ND_PRINT((ndo, " (bogus)"));
 323             cp += sublen;
 324             break;
 325         default:
 326             ND_PRINT((ndo, " sub-unknown-0x%02x", subtype));
 327             cp += sublen;
 328         } /* switch */
 329     } /* while */
 330     return;
 331
 332  invalid:
 333     ND_PRINT((ndo, "%s", istr));
 334 }
 335
 336 #define ICHECK(i, l) \
 337         if ((i) + (l) > bodylen || (i) + (l) > length) goto invalid;
 338
 339 static void
 340 babel_print_v2(netdissect_options *ndo,
 341                const u_char *cp, u_int length)
 342 {
 343     u_int i;
 344     u_short bodylen;
 345     u_char v4_prefix[16] =
 346         {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
 347     u_char v6_prefix[16] = {0};
 348
 349     ND_TCHECK2(*cp, 4);
 350     if (length < 4)
 351         goto invalid;
 352     bodylen = EXTRACT_16BITS(cp + 2);
 353     ND_PRINT((ndo, " (%u)", bodylen));
 354
 355     /* Process the TLVs in the body */
 356     i = 0;
 357     while(i < bodylen) {
 358         const u_char *message;
 359         u_int type, len;
 360
 361         message = cp + 4 + i;
 362
 363         ND_TCHECK2(*message, 1);
 364         if((type = message[0]) == MESSAGE_PAD1) {
 365             ND_PRINT((ndo, ndo->ndo_vflag ? "\n\tPad 1" : " pad1"));
 366             i += 1;
 367             continue;
 368         }
 369
 370         ND_TCHECK2(*message, 2);
 371         ICHECK(i, 2);
 372         len = message[1];
 373
 374         ND_TCHECK2(*message, 2 + len);
 375         ICHECK(i, 2 + len);
 376
 377         switch(type) {
 378         case MESSAGE_PADN: {
 379             if (!ndo->ndo_vflag)
 380                 ND_PRINT((ndo, " padN"));
 381             else
 382                 ND_PRINT((ndo, "\n\tPad %d", len + 2));
 383         }
 384             break;
 385
 386         case MESSAGE_ACK_REQ: {
 387             u_short nonce, interval;
 388             if (!ndo->ndo_vflag)
 389                 ND_PRINT((ndo, " ack-req"));
 390             else {
 391                 ND_PRINT((ndo, "\n\tAcknowledgment Request "));
 392                 if(len < 6) goto invalid;
 393                 nonce = EXTRACT_16BITS(message + 4);
 394                 interval = EXTRACT_16BITS(message + 6);
 395                 ND_PRINT((ndo, "%04x %s", nonce, format_interval(interval)));
 396             }
 397         }
 398             break;
 399
 400         case MESSAGE_ACK: {
 401             u_short nonce;
 402             if (!ndo->ndo_vflag)
 403                 ND_PRINT((ndo, " ack"));
 404             else {
 405                 ND_PRINT((ndo, "\n\tAcknowledgment "));
 406                 if(len < 2) goto invalid;
 407                 nonce = EXTRACT_16BITS(message + 2);
 408                 ND_PRINT((ndo, "%04x", nonce));
 409             }
 410         }
 411             break;
 412
 413         case MESSAGE_HELLO:  {
 414             u_short seqno, interval;
 415             if (!ndo->ndo_vflag)
 416                 ND_PRINT((ndo, " hello"));
 417             else {
 418                 ND_PRINT((ndo, "\n\tHello "));
 419                 if(len < 6) goto invalid;
 420                 seqno = EXTRACT_16BITS(message + 4);
 421                 interval = EXTRACT_16BITS(message + 6);
 422                 ND_PRINT((ndo, "seqno %u interval %s", seqno, format_interval(interval)));
 423                 /* Extra data. */
 424                 if(len > 6)
 425                     subtlvs_print(ndo, message + 8, message + 2 + len, type);
 426             }
 427         }
 428             break;
 429
 430         case MESSAGE_IHU: {
 431             unsigned short txcost, interval;
 432             if (!ndo->ndo_vflag)
 433                 ND_PRINT((ndo, " ihu"));
 434             else {
 435                 u_char address[16];
 436                 int rc;
 437                 ND_PRINT((ndo, "\n\tIHU "));
 438                 if(len < 6) goto invalid;
 439                 txcost = EXTRACT_16BITS(message + 4);
 440                 interval = EXTRACT_16BITS(message + 6);
 441                 rc = network_address(message[2], message + 8, len - 6, address);
 442                 if(rc < 0) { ND_PRINT((ndo, "%s", tstr)); break; }
 443                 ND_PRINT((ndo, "%s txcost %u interval %s",
 444                        format_address(ndo, address), txcost, format_interval(interval)));
 445                 /* Extra data. */
 446                 if((u_int)rc < len - 6)
 447                     subtlvs_print(ndo, message + 8 + rc, message + 2 + len,
 448                                   type);
 449             }
 450         }
 451             break;
 452
 453         case MESSAGE_ROUTER_ID: {
 454             if (!ndo->ndo_vflag)
 455                 ND_PRINT((ndo, " router-id"));
 456             else {
 457                 ND_PRINT((ndo, "\n\tRouter Id"));
 458                 if(len < 10) goto invalid;
 459                 ND_PRINT((ndo, " %s", format_id(message + 4)));
 460             }
 461         }
 462             break;
 463
 464         case MESSAGE_NH: {
 465             if (!ndo->ndo_vflag)
 466                 ND_PRINT((ndo, " nh"));
 467             else {
 468                 int rc;
 469                 u_char nh[16];
 470                 ND_PRINT((ndo, "\n\tNext Hop"));
 471                 if(len < 2) goto invalid;
 472                 rc = network_address(message[2], message + 4, len - 2, nh);
 473                 if(rc < 0) goto invalid;
 474                 ND_PRINT((ndo, " %s", format_address(ndo, nh)));
 475             }
 476         }
 477             break;
 478
 479         case MESSAGE_UPDATE: {
 480             if (!ndo->ndo_vflag) {
 481                 ND_PRINT((ndo, " update"));
 482                 if(len < 1)
 483                     ND_PRINT((ndo, "/truncated"));
 484                 else
 485                     ND_PRINT((ndo, "%s%s%s",
 486                            (message[3] & 0x80) ? "/prefix": "",
 487                            (message[3] & 0x40) ? "/id" : "",
 488                            (message[3] & 0x3f) ? "/unknown" : ""));
 489             } else {
 490                 u_short interval, seqno, metric;
 491                 u_char plen;
 492                 int rc;
 493                 u_char prefix[16];
 494                 ND_PRINT((ndo, "\n\tUpdate"));
 495                 if(len < 10) goto invalid;
 496                 plen = message[4] + (message[2] == 1 ? 96 : 0);
 497                 rc = network_prefix(message[2], message[4], message[5],
 498                                     message + 12,
 499                                     message[2] == 1 ? v4_prefix : v6_prefix,
 500                                     len - 10, prefix);
 501                 if(rc < 0) goto invalid;
 502                 interval = EXTRACT_16BITS(message + 6);
 503                 seqno = EXTRACT_16BITS(message + 8);
 504                 metric = EXTRACT_16BITS(message + 10);
 505                 ND_PRINT((ndo, "%s%s%s %s metric %u seqno %u interval %s",
 506                        (message[3] & 0x80) ? "/prefix": "",
 507                        (message[3] & 0x40) ? "/id" : "",
 508                        (message[3] & 0x3f) ? "/unknown" : "",
 509                        format_prefix(ndo, prefix, plen),
 510                        metric, seqno, format_interval_update(interval)));
 511                 if(message[3] & 0x80) {
 512                     if(message[2] == 1)
 513                         memcpy(v4_prefix, prefix, 16);
 514                     else
 515                         memcpy(v6_prefix, prefix, 16);
 516                 }
 517                 /* extra data? */
 518                 if((u_int)rc < len - 10)
 519                     subtlvs_print(ndo, message + 12 + rc, message + 2 + len, type);
 520             }
 521         }
 522             break;
 523
 524         case MESSAGE_REQUEST: {
 525             if (!ndo->ndo_vflag)
 526                 ND_PRINT((ndo, " request"));
 527             else {
 528                 int rc;
 529                 u_char prefix[16], plen;
 530                 ND_PRINT((ndo, "\n\tRequest "));
 531                 if(len < 2) goto invalid;
 532                 plen = message[3] + (message[2] == 1 ? 96 : 0);
 533                 rc = network_prefix(message[2], message[3], 0,
 534                                     message + 4, NULL, len - 2, prefix);
 535                 if(rc < 0) goto invalid;
 536                 ND_PRINT((ndo, "for %s",
 537                        message[2] == 0 ? "any" : format_prefix(ndo, prefix, plen)));
 538             }
 539         }
 540             break;
 541
 542         case MESSAGE_MH_REQUEST : {
 543             if (!ndo->ndo_vflag)
 544                 ND_PRINT((ndo, " mh-request"));
 545             else {
 546                 int rc;
 547                 u_short seqno;
 548                 u_char prefix[16], plen;
 549                 ND_PRINT((ndo, "\n\tMH-Request "));
 550                 if(len < 14) goto invalid;
 551                 seqno = EXTRACT_16BITS(message + 4);
 552                 rc = network_prefix(message[2], message[3], 0,
 553                                     message + 16, NULL, len - 14, prefix);
 554                 if(rc < 0) goto invalid;
 555                 plen = message[3] + (message[2] == 1 ? 96 : 0);
 556                 ND_PRINT((ndo, "(%u hops) for %s seqno %u id %s",
 557                        message[6], format_prefix(ndo, prefix, plen),
 558                        seqno, format_id(message + 8)));
 559             }
 560         }
 561             break;
 562         case MESSAGE_TSPC :
 563             if (!ndo->ndo_vflag)
 564                 ND_PRINT((ndo, " tspc"));
 565             else {
 566                 ND_PRINT((ndo, "\n\tTS/PC "));
 567                 if(len < 6) goto invalid;
 568                 ND_PRINT((ndo, "timestamp %u packetcounter %u", EXTRACT_32BITS (message + 4),
 569                        EXTRACT_16BITS(message + 2)));
 570             }
 571             break;
 572         case MESSAGE_HMAC : {
 573             if (!ndo->ndo_vflag)
 574                 ND_PRINT((ndo, " hmac"));
 575             else {
 576                 unsigned j;
 577                 ND_PRINT((ndo, "\n\tHMAC "));
 578                 if(len < 18) goto invalid;
 579                 ND_PRINT((ndo, "key-id %u digest-%u ", EXTRACT_16BITS(message + 2), len - 2));
 580                 for (j = 0; j < len - 2; j++)
 581                     ND_PRINT((ndo, "%02X", message[4 + j]));
 582             }
 583         }
 584             break;
 585
 586         case MESSAGE_UPDATE_SRC_SPECIFIC : {
 587             if(!ndo->ndo_vflag) {
 588                 ND_PRINT((ndo, " ss-update"));
 589             } else {
 590                 u_char prefix[16], src_prefix[16];
 591                 u_short interval, seqno, metric;
 592                 u_char ae, plen, src_plen, omitted;
 593                 int rc;
 594                 int parsed_len = 10;
 595                 ND_PRINT((ndo, "\n\tSS-Update"));
 596                 if(len < 10) goto invalid;
 597                 ae = message[2];
 598                 src_plen = message[3];
 599                 plen = message[4];
 600                 omitted = message[5];
 601                 interval = EXTRACT_16BITS(message + 6);
 602                 seqno = EXTRACT_16BITS(message + 8);
 603                 metric = EXTRACT_16BITS(message + 10);
 604                 rc = network_prefix(ae, plen, omitted, message + 2 + parsed_len,
 605                                     ae == 1 ? v4_prefix : v6_prefix,
 606                                     len - parsed_len, prefix);
 607                 if(rc < 0) goto invalid;
 608                 if(ae == 1)
 609                     plen += 96;
 610                 parsed_len += rc;
 611                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 612                                     NULL, len - parsed_len, src_prefix);
 613                 if(rc < 0) goto invalid;
 614                 if(ae == 1)
 615                     src_plen += 96;
 616                 parsed_len += rc;
 617
 618                 ND_PRINT((ndo, " %s from", format_prefix(ndo, prefix, plen)));
 619                 ND_PRINT((ndo, " %s metric %u seqno %u interval %s",
 620                           format_prefix(ndo, src_prefix, src_plen),
 621                           metric, seqno, format_interval_update(interval)));
 622                 /* extra data? */
 623                 if((u_int)parsed_len < len)
 624                     subtlvs_print(ndo, message + 2 + parsed_len,
 625                                   message + 2 + len, type);
 626             }
 627         }
 628             break;
 629
 630         case MESSAGE_REQUEST_SRC_SPECIFIC : {
 631             if(!ndo->ndo_vflag)
 632                 ND_PRINT((ndo, " ss-request"));
 633             else {
 634                 int rc, parsed_len = 3;
 635                 u_char ae, plen, src_plen, prefix[16], src_prefix[16];
 636                 ND_PRINT((ndo, "\n\tSS-Request "));
 637                 if(len < 3) goto invalid;
 638                 ae = message[2];
 639                 plen = message[3];
 640                 src_plen = message[4];
 641                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 642                                     NULL, len - parsed_len, prefix);
 643                 if(rc < 0) goto invalid;
 644                 if(ae == 1)
 645                     plen += 96;
 646                 parsed_len += rc;
 647                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 648                                     NULL, len - parsed_len, src_prefix);
 649                 if(rc < 0) goto invalid;
 650                 if(ae == 1)
 651                     src_plen += 96;
 652                 parsed_len += rc;
 653                 if(ae == 0) {
 654                     ND_PRINT((ndo, "for any"));
 655                 } else {
 656                     ND_PRINT((ndo, "for (%s, ", format_prefix(ndo, prefix, plen)));
 657                     ND_PRINT((ndo, "%s)", format_prefix(ndo, src_prefix, src_plen)));
 658                 }
 659             }
 660         }
 661             break;
 662
 663         case MESSAGE_MH_REQUEST_SRC_SPECIFIC : {
 664             if(!ndo->ndo_vflag)
 665                 ND_PRINT((ndo, " ss-mh-request"));
 666             else {
 667                 int rc, parsed_len = 14;
 668                 u_short seqno;
 669                 u_char ae, plen, src_plen, prefix[16], src_prefix[16], hopc;
 670                 const u_char *router_id = NULL;
 671                 ND_PRINT((ndo, "\n\tSS-MH-Request "));
 672                 if(len < 14) goto invalid;
 673                 ae = message[2];
 674                 plen = message[3];
 675                 seqno = EXTRACT_16BITS(message + 4);
 676                 hopc = message[6];
 677                 src_plen = message[7];
 678                 router_id = message + 8;
 679                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 680                                     NULL, len - parsed_len, prefix);
 681                 if(rc < 0) goto invalid;
 682                 if(ae == 1)
 683                     plen += 96;
 684                 parsed_len += rc;
 685                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 686                                     NULL, len - parsed_len, src_prefix);
 687                 if(rc < 0) goto invalid;
 688                 if(ae == 1)
 689                     src_plen += 96;
 690                 ND_PRINT((ndo, "(%u hops) for (%s, ",
 691                           hopc, format_prefix(ndo, prefix, plen)));
 692                 ND_PRINT((ndo, "%s) seqno %u id %s",
 693                           format_prefix(ndo, src_prefix, src_plen),
 694                           seqno, format_id(router_id)));
 695             }
 696         }
 697             break;
 698
 699         default:
 700             if (!ndo->ndo_vflag)
 701                 ND_PRINT((ndo, " unknown"));
 702             else
 703                 ND_PRINT((ndo, "\n\tUnknown message type %d", type));
 704         }
 705         i += len + 2;
 706     }
 707     return;
 708
 709  trunc:
 710     ND_PRINT((ndo, " %s", tstr));
 711     return;
 712
 713  invalid:
 714     ND_PRINT((ndo, "%s", istr));
 715     return;
 716 }