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 #ifdef INET6
 130         snprintf(buf, 50, "%s/%u", ip6addr_string(ndo, prefix), plen);
 131 #else
 132         snprintf(buf, 50, "IPv6 addresses not supported");
 133 #endif
 134     buf[49] = '\0';
 135     return buf;
 136 }
 137
 138 static const char *
 139 format_address(netdissect_options *ndo, const u_char *prefix)
 140 {
 141     if(memcmp(prefix, v4prefix, 12) == 0)
 142         return ipaddr_string(ndo, prefix + 12);
 143     else
 144 #ifdef INET6
 145         return ip6addr_string(ndo, prefix);
 146 #else
 147         return "IPv6 addresses not supported";
 148 #endif
 149 }
 150
 151 static const char *
 152 format_interval(const uint16_t i)
 153 {
 154     static char buf[sizeof("000.00s")];
 155
 156     if (i == 0)
 157         return "0.0s (bogus)";
 158     snprintf(buf, sizeof(buf), "%u.%02us", i / 100, i % 100);
 159     return buf;
 160 }
 161
 162 static const char *
 163 format_interval_update(const uint16_t i)
 164 {
 165     return i == 0xFFFF ? "infinity" : format_interval(i);
 166 }
 167
 168 static const char *
 169 format_timestamp(const uint32_t i)
 170 {
 171     static char buf[sizeof("0000.000000s")];
 172     snprintf(buf, sizeof(buf), "%u.%06us", i / 1000000, i % 1000000);
 173     return buf;
 174 }
 175
 176 /* Return number of octets consumed from the input buffer (not the prefix length
 177  * in bytes), or -1 for encoding error. */
 178 static int
 179 network_prefix(int ae, int plen, unsigned int omitted,
 180                const unsigned char *p, const unsigned char *dp,
 181                unsigned int len, unsigned char *p_r)
 182 {
 183     unsigned pb;
 184     unsigned char prefix[16];
 185     int consumed = 0;
 186
 187     if(plen >= 0)
 188         pb = (plen + 7) / 8;
 189     else if(ae == 1)
 190         pb = 4;
 191     else
 192         pb = 16;
 193
 194     if(pb > 16)
 195         return -1;
 196
 197     memset(prefix, 0, 16);
 198
 199     switch(ae) {
 200     case 0: break;
 201     case 1:
 202         if(omitted > 4 || pb > 4 || (pb > omitted && len < pb - omitted))
 203             return -1;
 204         memcpy(prefix, v4prefix, 12);
 205         if(omitted) {
 206             if (dp == NULL) return -1;
 207             memcpy(prefix, dp, 12 + omitted);
 208         }
 209         if(pb > omitted) {
 210             memcpy(prefix + 12 + omitted, p, pb - omitted);
 211             consumed = pb - omitted;
 212         }
 213         break;
 214     case 2:
 215         if(omitted > 16 || (pb > omitted && len < pb - omitted))
 216             return -1;
 217         if(omitted) {
 218             if (dp == NULL) return -1;
 219             memcpy(prefix, dp, omitted);
 220         }
 221         if(pb > omitted) {
 222             memcpy(prefix + omitted, p, pb - omitted);
 223             consumed = pb - omitted;
 224         }
 225         break;
 226     case 3:
 227         if(pb > 8 && len < pb - 8) return -1;
 228         prefix[0] = 0xfe;
 229         prefix[1] = 0x80;
 230         if(pb > 8) {
 231             memcpy(prefix + 8, p, pb - 8);
 232             consumed = pb - 8;
 233         }
 234         break;
 235     default:
 236         return -1;
 237     }
 238
 239     memcpy(p_r, prefix, 16);
 240     return consumed;
 241 }
 242
 243 static int
 244 network_address(int ae, const unsigned char *a, unsigned int len,
 245                 unsigned char *a_r)
 246 {
 247     return network_prefix(ae, -1, 0, a, NULL, len, a_r);
 248 }
 249
 250 /*
 251  * Sub-TLVs consume the "extra data" of Babel TLVs (see Section 4.3 of RFC6126),
 252  * their encoding is similar to the encoding of TLVs, but the type namespace is
 253  * different:
 254  *
 255  * o Type 0 stands for Pad1 sub-TLV with the same encoding as the Pad1 TLV.
 256  * o Type 1 stands for PadN sub-TLV with the same encoding as the PadN TLV.
 257  * o Type 2 stands for Diversity sub-TLV, which propagates diversity routing
 258  *   data. Its body is a variable-length sequence of 8-bit unsigned integers,
 259  *   each representing per-hop number of interferring radio channel for the
 260  *   prefix. Channel 0 is invalid and must not be used in the sub-TLV, channel
 261  *   255 interferes with any other channel.
 262  * o Type 3 stands for Timestamp sub-TLV, used to compute RTT between
 263  *   neighbours. In the case of a Hello TLV, the body stores a 32-bits
 264  *   timestamp, while in the case of a IHU TLV, two 32-bits timestamps are
 265  *   stored.
 266  *
 267  * Sub-TLV types 0 and 1 are valid for any TLV type, whether sub-TLV type 2 is
 268  * only valid for TLV type 8 (Update). Note that within an Update TLV a missing
 269  * Diversity sub-TLV is not the same as a Diversity sub-TLV with an empty body.
 270  * The former would mean a lack of any claims about the interference, and the
 271  * latter would state that interference is definitely absent.
 272  * A type 3 sub-TLV is valid both for Hello and IHU TLVs, though the exact
 273  * semantic of the sub-TLV is different in each case.
 274  */
 275 static void
 276 subtlvs_print(netdissect_options *ndo,
 277               const u_char *cp, const u_char *ep, const uint8_t tlv_type)
 278 {
 279     uint8_t subtype, sublen;
 280     const char *sep;
 281     uint32_t t1, t2;
 282
 283     while (cp < ep) {
 284         subtype = *cp++;
 285         if(subtype == MESSAGE_SUB_PAD1) {
 286             ND_PRINT((ndo, " sub-pad1"));
 287             continue;
 288         }
 289         if(cp == ep)
 290             goto invalid;
 291         sublen = *cp++;
 292         if(cp + sublen > ep)
 293             goto invalid;
 294
 295         switch(subtype) {
 296         case MESSAGE_SUB_PADN:
 297             ND_PRINT((ndo, " sub-padn"));
 298             cp += sublen;
 299             break;
 300         case MESSAGE_SUB_DIVERSITY:
 301             ND_PRINT((ndo, " sub-diversity"));
 302             if (sublen == 0) {
 303                 ND_PRINT((ndo, " empty"));
 304                 break;
 305             }
 306             sep = " ";
 307             while(sublen--) {
 308                 ND_PRINT((ndo, "%s%s", sep, tok2str(diversity_str, "%u", *cp++)));
 309                 sep = "-";
 310             }
 311             if(tlv_type != MESSAGE_UPDATE &&
 312                tlv_type != MESSAGE_UPDATE_SRC_SPECIFIC)
 313                 ND_PRINT((ndo, " (bogus)"));
 314             break;
 315         case MESSAGE_SUB_TIMESTAMP:
 316             ND_PRINT((ndo, " sub-timestamp"));
 317             if(tlv_type == MESSAGE_HELLO) {
 318                 if(sublen < 4)
 319                     goto invalid;
 320                 t1 = EXTRACT_32BITS(cp);
 321                 ND_PRINT((ndo, " %s", format_timestamp(t1)));
 322             } else if(tlv_type == MESSAGE_IHU) {
 323                 if(sublen < 8)
 324                     goto invalid;
 325                 t1 = EXTRACT_32BITS(cp);
 326                 ND_PRINT((ndo, " %s", format_timestamp(t1)));
 327                 t2 = EXTRACT_32BITS(cp + 4);
 328                 ND_PRINT((ndo, "|%s", format_timestamp(t2)));
 329             } else
 330                 ND_PRINT((ndo, " (bogus)"));
 331             cp += sublen;
 332             break;
 333         default:
 334             ND_PRINT((ndo, " sub-unknown-0x%02x", subtype));
 335             cp += sublen;
 336         } /* switch */
 337     } /* while */
 338     return;
 339
 340  invalid:
 341     ND_PRINT((ndo, "%s", istr));
 342 }
 343
 344 #define ICHECK(i, l) \
 345         if ((i) + (l) > bodylen || (i) + (l) > length) goto invalid;
 346
 347 static void
 348 babel_print_v2(netdissect_options *ndo,
 349                const u_char *cp, u_int length)
 350 {
 351     u_int i;
 352     u_short bodylen;
 353     u_char v4_prefix[16] =
 354         {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
 355     u_char v6_prefix[16] = {0};
 356
 357     ND_TCHECK2(*cp, 4);
 358     if (length < 4)
 359         goto invalid;
 360     bodylen = EXTRACT_16BITS(cp + 2);
 361     ND_PRINT((ndo, " (%u)", bodylen));
 362
 363     /* Process the TLVs in the body */
 364     i = 0;
 365     while(i < bodylen) {
 366         const u_char *message;
 367         u_int type, len;
 368
 369         message = cp + 4 + i;
 370
 371         ND_TCHECK2(*message, 1);
 372         if((type = message[0]) == MESSAGE_PAD1) {
 373             ND_PRINT((ndo, ndo->ndo_vflag ? "\n\tPad 1" : " pad1"));
 374             i += 1;
 375             continue;
 376         }
 377
 378         ND_TCHECK2(*message, 2);
 379         ICHECK(i, 2);
 380         len = message[1];
 381
 382         ND_TCHECK2(*message, 2 + len);
 383         ICHECK(i, 2 + len);
 384
 385         switch(type) {
 386         case MESSAGE_PADN: {
 387             if (!ndo->ndo_vflag)
 388                 ND_PRINT((ndo, " padN"));
 389             else
 390                 ND_PRINT((ndo, "\n\tPad %d", len + 2));
 391         }
 392             break;
 393
 394         case MESSAGE_ACK_REQ: {
 395             u_short nonce, interval;
 396             if (!ndo->ndo_vflag)
 397                 ND_PRINT((ndo, " ack-req"));
 398             else {
 399                 ND_PRINT((ndo, "\n\tAcknowledgment Request "));
 400                 if(len < 6) goto invalid;
 401                 nonce = EXTRACT_16BITS(message + 4);
 402                 interval = EXTRACT_16BITS(message + 6);
 403                 ND_PRINT((ndo, "%04x %s", nonce, format_interval(interval)));
 404             }
 405         }
 406             break;
 407
 408         case MESSAGE_ACK: {
 409             u_short nonce;
 410             if (!ndo->ndo_vflag)
 411                 ND_PRINT((ndo, " ack"));
 412             else {
 413                 ND_PRINT((ndo, "\n\tAcknowledgment "));
 414                 if(len < 2) goto invalid;
 415                 nonce = EXTRACT_16BITS(message + 2);
 416                 ND_PRINT((ndo, "%04x", nonce));
 417             }
 418         }
 419             break;
 420
 421         case MESSAGE_HELLO:  {
 422             u_short seqno, interval;
 423             if (!ndo->ndo_vflag)
 424                 ND_PRINT((ndo, " hello"));
 425             else {
 426                 ND_PRINT((ndo, "\n\tHello "));
 427                 if(len < 6) goto invalid;
 428                 seqno = EXTRACT_16BITS(message + 4);
 429                 interval = EXTRACT_16BITS(message + 6);
 430                 ND_PRINT((ndo, "seqno %u interval %s", seqno, format_interval(interval)));
 431                 /* Extra data. */
 432                 if(len > 6)
 433                     subtlvs_print(ndo, message + 8, message + 2 + len, type);
 434             }
 435         }
 436             break;
 437
 438         case MESSAGE_IHU: {
 439             unsigned short txcost, interval;
 440             if (!ndo->ndo_vflag)
 441                 ND_PRINT((ndo, " ihu"));
 442             else {
 443                 u_char address[16];
 444                 int rc;
 445                 ND_PRINT((ndo, "\n\tIHU "));
 446                 if(len < 6) goto invalid;
 447                 txcost = EXTRACT_16BITS(message + 4);
 448                 interval = EXTRACT_16BITS(message + 6);
 449                 rc = network_address(message[2], message + 8, len - 6, address);
 450                 if(rc < 0) { ND_PRINT((ndo, "%s", tstr)); break; }
 451                 ND_PRINT((ndo, "%s txcost %u interval %s",
 452                        format_address(ndo, address), txcost, format_interval(interval)));
 453                 /* Extra data. */
 454                 if((u_int)rc < len - 6)
 455                     subtlvs_print(ndo, message + 8 + rc, message + 2 + len,
 456                                   type);
 457             }
 458         }
 459             break;
 460
 461         case MESSAGE_ROUTER_ID: {
 462             if (!ndo->ndo_vflag)
 463                 ND_PRINT((ndo, " router-id"));
 464             else {
 465                 ND_PRINT((ndo, "\n\tRouter Id"));
 466                 if(len < 10) goto invalid;
 467                 ND_PRINT((ndo, " %s", format_id(message + 4)));
 468             }
 469         }
 470             break;
 471
 472         case MESSAGE_NH: {
 473             if (!ndo->ndo_vflag)
 474                 ND_PRINT((ndo, " nh"));
 475             else {
 476                 int rc;
 477                 u_char nh[16];
 478                 ND_PRINT((ndo, "\n\tNext Hop"));
 479                 if(len < 2) goto invalid;
 480                 rc = network_address(message[2], message + 4, len - 2, nh);
 481                 if(rc < 0) goto invalid;
 482                 ND_PRINT((ndo, " %s", format_address(ndo, nh)));
 483             }
 484         }
 485             break;
 486
 487         case MESSAGE_UPDATE: {
 488             if (!ndo->ndo_vflag) {
 489                 ND_PRINT((ndo, " update"));
 490                 if(len < 1)
 491                     ND_PRINT((ndo, "/truncated"));
 492                 else
 493                     ND_PRINT((ndo, "%s%s%s",
 494                            (message[3] & 0x80) ? "/prefix": "",
 495                            (message[3] & 0x40) ? "/id" : "",
 496                            (message[3] & 0x3f) ? "/unknown" : ""));
 497             } else {
 498                 u_short interval, seqno, metric;
 499                 u_char plen;
 500                 int rc;
 501                 u_char prefix[16];
 502                 ND_PRINT((ndo, "\n\tUpdate"));
 503                 if(len < 10) goto invalid;
 504                 plen = message[4] + (message[2] == 1 ? 96 : 0);
 505                 rc = network_prefix(message[2], message[4], message[5],
 506                                     message + 12,
 507                                     message[2] == 1 ? v4_prefix : v6_prefix,
 508                                     len - 10, prefix);
 509                 if(rc < 0) goto invalid;
 510                 interval = EXTRACT_16BITS(message + 6);
 511                 seqno = EXTRACT_16BITS(message + 8);
 512                 metric = EXTRACT_16BITS(message + 10);
 513                 ND_PRINT((ndo, "%s%s%s %s metric %u seqno %u interval %s",
 514                        (message[3] & 0x80) ? "/prefix": "",
 515                        (message[3] & 0x40) ? "/id" : "",
 516                        (message[3] & 0x3f) ? "/unknown" : "",
 517                        format_prefix(ndo, prefix, plen),
 518                        metric, seqno, format_interval_update(interval)));
 519                 if(message[3] & 0x80) {
 520                     if(message[2] == 1)
 521                         memcpy(v4_prefix, prefix, 16);
 522                     else
 523                         memcpy(v6_prefix, prefix, 16);
 524                 }
 525                 /* extra data? */
 526                 if((u_int)rc < len - 10)
 527                     subtlvs_print(ndo, message + 12 + rc, message + 2 + len, type);
 528             }
 529         }
 530             break;
 531
 532         case MESSAGE_REQUEST: {
 533             if (!ndo->ndo_vflag)
 534                 ND_PRINT((ndo, " request"));
 535             else {
 536                 int rc;
 537                 u_char prefix[16], plen;
 538                 ND_PRINT((ndo, "\n\tRequest "));
 539                 if(len < 2) goto invalid;
 540                 plen = message[3] + (message[2] == 1 ? 96 : 0);
 541                 rc = network_prefix(message[2], message[3], 0,
 542                                     message + 4, NULL, len - 2, prefix);
 543                 if(rc < 0) goto invalid;
 544                 ND_PRINT((ndo, "for %s",
 545                        message[2] == 0 ? "any" : format_prefix(ndo, prefix, plen)));
 546             }
 547         }
 548             break;
 549
 550         case MESSAGE_MH_REQUEST : {
 551             if (!ndo->ndo_vflag)
 552                 ND_PRINT((ndo, " mh-request"));
 553             else {
 554                 int rc;
 555                 u_short seqno;
 556                 u_char prefix[16], plen;
 557                 ND_PRINT((ndo, "\n\tMH-Request "));
 558                 if(len < 14) goto invalid;
 559                 seqno = EXTRACT_16BITS(message + 4);
 560                 rc = network_prefix(message[2], message[3], 0,
 561                                     message + 16, NULL, len - 14, prefix);
 562                 if(rc < 0) goto invalid;
 563                 plen = message[3] + (message[2] == 1 ? 96 : 0);
 564                 ND_PRINT((ndo, "(%u hops) for %s seqno %u id %s",
 565                        message[6], format_prefix(ndo, prefix, plen),
 566                        seqno, format_id(message + 8)));
 567             }
 568         }
 569             break;
 570         case MESSAGE_TSPC :
 571             if (!ndo->ndo_vflag)
 572                 ND_PRINT((ndo, " tspc"));
 573             else {
 574                 ND_PRINT((ndo, "\n\tTS/PC "));
 575                 if(len < 6) goto invalid;
 576                 ND_PRINT((ndo, "timestamp %u packetcounter %u", EXTRACT_32BITS (message + 4),
 577                        EXTRACT_16BITS(message + 2)));
 578             }
 579             break;
 580         case MESSAGE_HMAC : {
 581             if (!ndo->ndo_vflag)
 582                 ND_PRINT((ndo, " hmac"));
 583             else {
 584                 unsigned j;
 585                 ND_PRINT((ndo, "\n\tHMAC "));
 586                 if(len < 18) goto invalid;
 587                 ND_PRINT((ndo, "key-id %u digest-%u ", EXTRACT_16BITS(message + 2), len - 2));
 588                 for (j = 0; j < len - 2; j++)
 589                     ND_PRINT((ndo, "%02X", message[4 + j]));
 590             }
 591         }
 592             break;
 593
 594         case MESSAGE_UPDATE_SRC_SPECIFIC : {
 595             if(!ndo->ndo_vflag) {
 596                 ND_PRINT((ndo, " ss-update"));
 597             } else {
 598                 u_char prefix[16], src_prefix[16];
 599                 u_short interval, seqno, metric;
 600                 u_char ae, plen, src_plen, omitted;
 601                 int rc;
 602                 int parsed_len = 10;
 603                 ND_PRINT((ndo, "\n\tSS-Update"));
 604                 if(len < 10) goto invalid;
 605                 ae = message[2];
 606                 src_plen = message[3];
 607                 plen = message[4];
 608                 omitted = message[5];
 609                 interval = EXTRACT_16BITS(message + 6);
 610                 seqno = EXTRACT_16BITS(message + 8);
 611                 metric = EXTRACT_16BITS(message + 10);
 612                 rc = network_prefix(ae, plen, omitted, message + 2 + parsed_len,
 613                                     ae == 1 ? v4_prefix : v6_prefix,
 614                                     len - parsed_len, prefix);
 615                 if(rc < 0) goto invalid;
 616                 if(ae == 1)
 617                     plen += 96;
 618                 parsed_len += rc;
 619                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 620                                     NULL, len - parsed_len, src_prefix);
 621                 if(rc < 0) goto invalid;
 622                 if(ae == 1)
 623                     src_plen += 96;
 624                 parsed_len += rc;
 625
 626                 ND_PRINT((ndo, " %s from", format_prefix(ndo, prefix, plen)));
 627                 ND_PRINT((ndo, " %s metric %u seqno %u interval %s",
 628                           format_prefix(ndo, src_prefix, src_plen),
 629                           metric, seqno, format_interval_update(interval)));
 630                 /* extra data? */
 631                 if((u_int)parsed_len < len)
 632                     subtlvs_print(ndo, message + 2 + parsed_len,
 633                                   message + 2 + len, type);
 634             }
 635         }
 636             break;
 637
 638         case MESSAGE_REQUEST_SRC_SPECIFIC : {
 639             if(!ndo->ndo_vflag)
 640                 ND_PRINT((ndo, " ss-request"));
 641             else {
 642                 int rc, parsed_len = 3;
 643                 u_char ae, plen, src_plen, prefix[16], src_prefix[16];
 644                 ND_PRINT((ndo, "\n\tSS-Request "));
 645                 if(len < 3) goto invalid;
 646                 ae = message[2];
 647                 plen = message[3];
 648                 src_plen = message[4];
 649                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 650                                     NULL, len - parsed_len, prefix);
 651                 if(rc < 0) goto invalid;
 652                 if(ae == 1)
 653                     plen += 96;
 654                 parsed_len += rc;
 655                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 656                                     NULL, len - parsed_len, src_prefix);
 657                 if(rc < 0) goto invalid;
 658                 if(ae == 1)
 659                     src_plen += 96;
 660                 parsed_len += rc;
 661                 if(ae == 0) {
 662                     ND_PRINT((ndo, "for any"));
 663                 } else {
 664                     ND_PRINT((ndo, "for (%s, ", format_prefix(ndo, prefix, plen)));
 665                     ND_PRINT((ndo, "%s)", format_prefix(ndo, src_prefix, src_plen)));
 666                 }
 667             }
 668         }
 669             break;
 670
 671         case MESSAGE_MH_REQUEST_SRC_SPECIFIC : {
 672             if(!ndo->ndo_vflag)
 673                 ND_PRINT((ndo, " ss-mh-request"));
 674             else {
 675                 int rc, parsed_len = 14;
 676                 u_short seqno;
 677                 u_char ae, plen, src_plen, prefix[16], src_prefix[16], hopc;
 678                 const u_char *router_id = NULL;
 679                 ND_PRINT((ndo, "\n\tSS-MH-Request "));
 680                 if(len < 14) goto invalid;
 681                 ae = message[2];
 682                 plen = message[3];
 683                 seqno = EXTRACT_16BITS(message + 4);
 684                 hopc = message[6];
 685                 src_plen = message[7];
 686                 router_id = message + 8;
 687                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 688                                     NULL, len - parsed_len, prefix);
 689                 if(rc < 0) goto invalid;
 690                 if(ae == 1)
 691                     plen += 96;
 692                 parsed_len += rc;
 693                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 694                                     NULL, len - parsed_len, src_prefix);
 695                 if(rc < 0) goto invalid;
 696                 if(ae == 1)
 697                     src_plen += 96;
 698                 ND_PRINT((ndo, "(%u hops) for (%s, ",
 699                           hopc, format_prefix(ndo, prefix, plen)));
 700                 ND_PRINT((ndo, "%s) seqno %u id %s",
 701                           format_prefix(ndo, src_prefix, src_plen),
 702                           seqno, format_id(router_id)));
 703             }
 704         }
 705             break;
 706
 707         default:
 708             if (!ndo->ndo_vflag)
 709                 ND_PRINT((ndo, " unknown"));
 710             else
 711                 ND_PRINT((ndo, "\n\tUnknown message type %d", type));
 712         }
 713         i += len + 2;
 714     }
 715     return;
 716
 717  trunc:
 718     ND_PRINT((ndo, " %s", tstr));
 719     return;
 720
 721  invalid:
 722     ND_PRINT((ndo, "%s", istr));
 723     return;
 724 }