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 /* \summary: Babel Routing Protocol printer */
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include <config.h>
  33 #endif
  34
  35 #include "netdissect-stdinc.h"
  36
  37 #include <stdio.h>
  38 #include <string.h>
  39
  40 #include "netdissect.h"
  41 #include "addrtoname.h"
  42 #include "extract.h"
  43
  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     ndo->ndo_protocol = "babel";
  52     ND_PRINT("babel");
  53
  54     ND_TCHECK_4(cp);
  55
  56     if(EXTRACT_U_1(cp) != 42) {
  57         ND_PRINT(" invalid header");
  58         return;
  59     } else {
  60         ND_PRINT(" %u", EXTRACT_U_1(cp + 1));
  61     }
  62
  63     switch(EXTRACT_U_1(cp + 1)) {
  64     case 2:
  65         babel_print_v2(ndo, cp, length);
  66         break;
  67     default:
  68         ND_PRINT(" unknown version");
  69         break;
  70     }
  71
  72     return;
  73
  74  trunc:
  75     nd_print_trunc(ndo);
  76     return;
  77 }
  78
  79 /* TLVs */
  80 #define MESSAGE_PAD1 0
  81 #define MESSAGE_PADN 1
  82 #define MESSAGE_ACK_REQ 2
  83 #define MESSAGE_ACK 3
  84 #define MESSAGE_HELLO 4
  85 #define MESSAGE_IHU 5
  86 #define MESSAGE_ROUTER_ID 6
  87 #define MESSAGE_NH 7
  88 #define MESSAGE_UPDATE 8
  89 #define MESSAGE_ROUTE_REQUEST 9
  90 #define MESSAGE_SEQNO_REQUEST 10
  91 #define MESSAGE_TSPC 11
  92 #define MESSAGE_HMAC 12
  93 #define MESSAGE_UPDATE_SRC_SPECIFIC 13 /* last appearance in draft-boutier-babel-source-specific-01 */
  94 #define MESSAGE_REQUEST_SRC_SPECIFIC 14 /* idem */
  95 #define MESSAGE_MH_REQUEST_SRC_SPECIFIC 15 /* idem */
  96
  97 /* sub-TLVs */
  98 #define MESSAGE_SUB_PAD1 0
  99 #define MESSAGE_SUB_PADN 1
 100 #define MESSAGE_SUB_DIVERSITY 2
 101 #define MESSAGE_SUB_TIMESTAMP 3
 102
 103 /* Diversity sub-TLV channel codes */
 104 static const struct tok diversity_str[] = {
 105     { 0,   "reserved" },
 106     { 255, "all"      },
 107     { 0, NULL }
 108 };
 109
 110 static const char *
 111 format_id(const u_char *id)
 112 {
 113     static char buf[25];
 114     nd_snprintf(buf, 25, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
 115              EXTRACT_U_1(id), EXTRACT_U_1(id + 1), EXTRACT_U_1(id + 2),
 116              EXTRACT_U_1(id + 3), EXTRACT_U_1(id + 4), EXTRACT_U_1(id + 5),
 117              EXTRACT_U_1(id + 6), EXTRACT_U_1(id + 7));
 118     buf[24] = '\0';
 119     return buf;
 120 }
 121
 122 static const unsigned char v4prefix[16] =
 123     {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
 124
 125 static const char *
 126 format_prefix(netdissect_options *ndo, const u_char *prefix, unsigned char plen)
 127 {
 128     static char buf[50];
 129     if(plen >= 96 && memcmp(prefix, v4prefix, 12) == 0)
 130         nd_snprintf(buf, 50, "%s/%u", ipaddr_string(ndo, prefix + 12), plen - 96);
 131     else
 132         nd_snprintf(buf, 50, "%s/%u", ip6addr_string(ndo, prefix), plen);
 133     buf[49] = '\0';
 134     return buf;
 135 }
 136
 137 static const char *
 138 format_address(netdissect_options *ndo, const u_char *prefix)
 139 {
 140     if(memcmp(prefix, v4prefix, 12) == 0)
 141         return ipaddr_string(ndo, prefix + 12);
 142     else
 143         return ip6addr_string(ndo, prefix);
 144 }
 145
 146 static const char *
 147 format_interval(const uint16_t i)
 148 {
 149     static char buf[sizeof("000.00s")];
 150
 151     if (i == 0)
 152         return "0.0s (bogus)";
 153     nd_snprintf(buf, sizeof(buf), "%u.%02us", i / 100, i % 100);
 154     return buf;
 155 }
 156
 157 static const char *
 158 format_interval_update(const uint16_t i)
 159 {
 160     return i == 0xFFFF ? "infinity" : format_interval(i);
 161 }
 162
 163 static const char *
 164 format_timestamp(const uint32_t i)
 165 {
 166     static char buf[sizeof("0000.000000s")];
 167     nd_snprintf(buf, sizeof(buf), "%u.%06us", i / 1000000, i % 1000000);
 168     return buf;
 169 }
 170
 171 /* Return number of octets consumed from the input buffer (not the prefix length
 172  * in bytes), or -1 for encoding error. */
 173 static int
 174 network_prefix(int ae, int plen, unsigned int omitted,
 175                const unsigned char *p, const unsigned char *dp,
 176                unsigned int len, unsigned char *p_r)
 177 {
 178     unsigned pb;
 179     unsigned char prefix[16];
 180     int consumed = 0;
 181
 182     if(plen >= 0)
 183         pb = (plen + 7) / 8;
 184     else if(ae == 1)
 185         pb = 4;
 186     else
 187         pb = 16;
 188
 189     if(pb > 16)
 190         return -1;
 191
 192     memset(prefix, 0, 16);
 193
 194     switch(ae) {
 195     case 0: break;
 196     case 1:
 197         if(omitted > 4 || pb > 4 || (pb > omitted && len < pb - omitted))
 198             return -1;
 199         memcpy(prefix, v4prefix, 12);
 200         if(omitted) {
 201             if (dp == NULL) return -1;
 202             memcpy(prefix, dp, 12 + omitted);
 203         }
 204         if(pb > omitted) {
 205             memcpy(prefix + 12 + omitted, p, pb - omitted);
 206             consumed = pb - omitted;
 207         }
 208         break;
 209     case 2:
 210         if(omitted > 16 || (pb > omitted && len < pb - omitted))
 211             return -1;
 212         if(omitted) {
 213             if (dp == NULL) return -1;
 214             memcpy(prefix, dp, omitted);
 215         }
 216         if(pb > omitted) {
 217             memcpy(prefix + omitted, p, pb - omitted);
 218             consumed = pb - omitted;
 219         }
 220         break;
 221     case 3:
 222         if(pb > 8 && len < pb - 8) return -1;
 223         prefix[0] = 0xfe;
 224         prefix[1] = 0x80;
 225         if(pb > 8) {
 226             memcpy(prefix + 8, p, pb - 8);
 227             consumed = pb - 8;
 228         }
 229         break;
 230     default:
 231         return -1;
 232     }
 233
 234     memcpy(p_r, prefix, 16);
 235     return consumed;
 236 }
 237
 238 static int
 239 network_address(int ae, const unsigned char *a, unsigned int len,
 240                 unsigned char *a_r)
 241 {
 242     return network_prefix(ae, -1, 0, a, NULL, len, a_r);
 243 }
 244
 245 /*
 246  * Sub-TLVs consume the "extra data" of Babel TLVs (see Section 4.3 of RFC6126),
 247  * their encoding is similar to the encoding of TLVs, but the type namespace is
 248  * different:
 249  *
 250  * o Type 0 stands for Pad1 sub-TLV with the same encoding as the Pad1 TLV.
 251  * o Type 1 stands for PadN sub-TLV with the same encoding as the PadN TLV.
 252  * o Type 2 stands for Diversity sub-TLV, which propagates diversity routing
 253  *   data. Its body is a variable-length sequence of 8-bit unsigned integers,
 254  *   each representing per-hop number of interferring radio channel for the
 255  *   prefix. Channel 0 is invalid and must not be used in the sub-TLV, channel
 256  *   255 interferes with any other channel.
 257  * o Type 3 stands for Timestamp sub-TLV, used to compute RTT between
 258  *   neighbours. In the case of a Hello TLV, the body stores a 32-bits
 259  *   timestamp, while in the case of a IHU TLV, two 32-bits timestamps are
 260  *   stored.
 261  *
 262  * Sub-TLV types 0 and 1 are valid for any TLV type, whether sub-TLV type 2 is
 263  * only valid for TLV type 8 (Update). Note that within an Update TLV a missing
 264  * Diversity sub-TLV is not the same as a Diversity sub-TLV with an empty body.
 265  * The former would mean a lack of any claims about the interference, and the
 266  * latter would state that interference is definitely absent.
 267  * A type 3 sub-TLV is valid both for Hello and IHU TLVs, though the exact
 268  * semantic of the sub-TLV is different in each case.
 269  */
 270 static void
 271 subtlvs_print(netdissect_options *ndo,
 272               const u_char *cp, const u_char *ep, const uint8_t tlv_type)
 273 {
 274     uint8_t subtype, sublen;
 275     const char *sep;
 276     uint32_t t1, t2;
 277
 278     while (cp < ep) {
 279         subtype = EXTRACT_U_1(cp);
 280         cp++;
 281         if(subtype == MESSAGE_SUB_PAD1) {
 282             ND_PRINT(" sub-pad1");
 283             continue;
 284         }
 285         if(cp == ep)
 286             goto invalid;
 287         sublen = EXTRACT_U_1(cp);
 288         cp++;
 289         if(cp + sublen > ep)
 290             goto invalid;
 291
 292         switch(subtype) {
 293         case MESSAGE_SUB_PADN:
 294             ND_PRINT(" sub-padn");
 295             cp += sublen;
 296             break;
 297         case MESSAGE_SUB_DIVERSITY:
 298             ND_PRINT(" sub-diversity");
 299             if (sublen == 0) {
 300                 ND_PRINT(" empty");
 301                 break;
 302             }
 303             sep = " ";
 304             while(sublen--) {
 305                 ND_PRINT("%s%s", sep, tok2str(diversity_str, "%u", EXTRACT_U_1(cp)));
 306                 cp++;
 307                 sep = "-";
 308             }
 309             if(tlv_type != MESSAGE_UPDATE &&
 310                tlv_type != MESSAGE_UPDATE_SRC_SPECIFIC)
 311                 ND_PRINT(" (bogus)");
 312             break;
 313         case MESSAGE_SUB_TIMESTAMP:
 314             ND_PRINT(" sub-timestamp");
 315             if(tlv_type == MESSAGE_HELLO) {
 316                 if(sublen < 4)
 317                     goto invalid;
 318                 t1 = EXTRACT_BE_U_4(cp);
 319                 ND_PRINT(" %s", format_timestamp(t1));
 320             } else if(tlv_type == MESSAGE_IHU) {
 321                 if(sublen < 8)
 322                     goto invalid;
 323                 t1 = EXTRACT_BE_U_4(cp);
 324                 ND_PRINT(" %s", format_timestamp(t1));
 325                 t2 = EXTRACT_BE_U_4(cp + 4);
 326                 ND_PRINT("|%s", format_timestamp(t2));
 327             } else
 328                 ND_PRINT(" (bogus)");
 329             cp += sublen;
 330             break;
 331         default:
 332             ND_PRINT(" sub-unknown-0x%02x", subtype);
 333             cp += sublen;
 334         } /* switch */
 335     } /* while */
 336     return;
 337
 338  invalid:
 339     ND_PRINT("%s", istr);
 340 }
 341
 342 #define ICHECK(i, l) \
 343         if ((i) + (l) > bodylen || (i) + (l) > length) goto invalid;
 344
 345 static void
 346 babel_print_v2(netdissect_options *ndo,
 347                const u_char *cp, u_int length)
 348 {
 349     u_int i;
 350     u_short bodylen;
 351     u_char v4_prefix[16] =
 352         {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
 353     u_char v6_prefix[16] = {0};
 354
 355     ND_TCHECK_4(cp);
 356     if (length < 4)
 357         goto invalid;
 358     bodylen = EXTRACT_BE_U_2(cp + 2);
 359     ND_PRINT(" (%u)", bodylen);
 360
 361     /* Process the TLVs in the body */
 362     i = 0;
 363     while(i < bodylen) {
 364         const u_char *message;
 365         u_int type, len;
 366
 367         message = cp + 4 + i;
 368
 369         ND_TCHECK_1(message);
 370         if((type = EXTRACT_U_1(message)) == MESSAGE_PAD1) {
 371             ND_PRINT(ndo->ndo_vflag ? "\n\tPad 1" : " pad1");
 372             i += 1;
 373             continue;
 374         }
 375
 376         ND_TCHECK_2(message);
 377         ICHECK(i, 2);
 378         len = EXTRACT_U_1(message + 1);
 379
 380         ND_TCHECK_LEN(message, 2 + len);
 381         ICHECK(i, 2 + len);
 382
 383         switch(type) {
 384         case MESSAGE_PADN: {
 385             if (!ndo->ndo_vflag)
 386                 ND_PRINT(" padN");
 387             else
 388                 ND_PRINT("\n\tPad %u", len + 2);
 389         }
 390             break;
 391
 392         case MESSAGE_ACK_REQ: {
 393             u_short nonce, interval;
 394             if (!ndo->ndo_vflag)
 395                 ND_PRINT(" ack-req");
 396             else {
 397                 ND_PRINT("\n\tAcknowledgment Request ");
 398                 if(len < 6) goto invalid;
 399                 nonce = EXTRACT_BE_U_2(message + 4);
 400                 interval = EXTRACT_BE_U_2(message + 6);
 401                 ND_PRINT("%04x %s", nonce, format_interval(interval));
 402             }
 403         }
 404             break;
 405
 406         case MESSAGE_ACK: {
 407             u_short nonce;
 408             if (!ndo->ndo_vflag)
 409                 ND_PRINT(" ack");
 410             else {
 411                 ND_PRINT("\n\tAcknowledgment ");
 412                 if(len < 2) goto invalid;
 413                 nonce = EXTRACT_BE_U_2(message + 2);
 414                 ND_PRINT("%04x", nonce);
 415             }
 416         }
 417             break;
 418
 419         case MESSAGE_HELLO:  {
 420             u_short seqno, interval;
 421             if (!ndo->ndo_vflag)
 422                 ND_PRINT(" hello");
 423             else {
 424                 ND_PRINT("\n\tHello ");
 425                 if(len < 6) goto invalid;
 426                 seqno = EXTRACT_BE_U_2(message + 4);
 427                 interval = EXTRACT_BE_U_2(message + 6);
 428                 ND_PRINT("seqno %u interval %s", seqno, format_interval(interval));
 429                 /* Extra data. */
 430                 if(len > 6)
 431                     subtlvs_print(ndo, message + 8, message + 2 + len, type);
 432             }
 433         }
 434             break;
 435
 436         case MESSAGE_IHU: {
 437             unsigned short rxcost, interval;
 438             if (!ndo->ndo_vflag)
 439                 ND_PRINT(" ihu");
 440             else {
 441                 u_char address[16];
 442                 u_char ae;
 443                 int rc;
 444                 ND_PRINT("\n\tIHU ");
 445                 if(len < 6) goto invalid;
 446                 rxcost = EXTRACT_BE_U_2(message + 4);
 447                 interval = EXTRACT_BE_U_2(message + 6);
 448                 ae = EXTRACT_U_1(message + 2);
 449                 rc = network_address(ae, message + 8,
 450                                      len - 6, address);
 451                 if(rc < 0) { nd_print_trunc(ndo); break; }
 452                 ND_PRINT("%s rxcost %u interval %s",
 453                        ae == 0 ? "any" : format_address(ndo, address),
 454                        rxcost, format_interval(interval));
 455                 /* Extra data. */
 456                 if((u_int)rc < len - 6)
 457                     subtlvs_print(ndo, message + 8 + rc, message + 2 + len,
 458                                   type);
 459             }
 460         }
 461             break;
 462
 463         case MESSAGE_ROUTER_ID: {
 464             if (!ndo->ndo_vflag)
 465                 ND_PRINT(" router-id");
 466             else {
 467                 ND_PRINT("\n\tRouter Id");
 468                 if(len < 10) goto invalid;
 469                 ND_PRINT(" %s", format_id(message + 4));
 470             }
 471         }
 472             break;
 473
 474         case MESSAGE_NH: {
 475             if (!ndo->ndo_vflag)
 476                 ND_PRINT(" nh");
 477             else {
 478                 int rc;
 479                 u_char ae;
 480                 u_char nh[16];
 481                 ND_PRINT("\n\tNext Hop");
 482                 if(len < 2) goto invalid;
 483                 ae = EXTRACT_U_1(message + 2);
 484                 rc = network_address(ae, message + 4,
 485                                      len - 2, nh);
 486                 if(rc < 0) goto invalid;
 487                 ND_PRINT(" %s", ae == 0 ? "invalid AE 0" : format_address(ndo, nh));
 488             }
 489         }
 490             break;
 491
 492         case MESSAGE_UPDATE: {
 493             if (!ndo->ndo_vflag) {
 494                 ND_PRINT(" update");
 495                 if(len < 1)
 496                     ND_PRINT("/truncated");
 497                 else
 498                     ND_PRINT("%s%s%s",
 499                            (EXTRACT_U_1(message + 3) & 0x80) ? "/prefix": "",
 500                            (EXTRACT_U_1(message + 3) & 0x40) ? "/id" : "",
 501                            (EXTRACT_U_1(message + 3) & 0x3f) ? "/unknown" : "");
 502             } else {
 503                 u_short interval, seqno, metric;
 504                 u_char ae, plen;
 505                 int rc;
 506                 u_char prefix[16];
 507                 ND_PRINT("\n\tUpdate");
 508                 if(len < 10) goto invalid;
 509                 ae = EXTRACT_U_1(message + 2);
 510                 plen = EXTRACT_U_1(message + 4) + (EXTRACT_U_1(message + 2) == 1 ? 96 : 0);
 511                 rc = network_prefix(ae,
 512                                     EXTRACT_U_1(message + 4),
 513                                     EXTRACT_U_1(message + 5),
 514                                     message + 12,
 515                                     EXTRACT_U_1(message + 2) == 1 ? v4_prefix : v6_prefix,
 516                                     len - 10, prefix);
 517                 if(rc < 0) goto invalid;
 518                 interval = EXTRACT_BE_U_2(message + 6);
 519                 seqno = EXTRACT_BE_U_2(message + 8);
 520                 metric = EXTRACT_BE_U_2(message + 10);
 521                 ND_PRINT("%s%s%s %s metric %u seqno %u interval %s",
 522                        (EXTRACT_U_1(message + 3) & 0x80) ? "/prefix": "",
 523                        (EXTRACT_U_1(message + 3) & 0x40) ? "/id" : "",
 524                        (EXTRACT_U_1(message + 3) & 0x3f) ? "/unknown" : "",
 525                        ae == 0 ? "any" : format_prefix(ndo, prefix, plen),
 526                        metric, seqno, format_interval_update(interval));
 527                 if(EXTRACT_U_1(message + 3) & 0x80) {
 528                     if(EXTRACT_U_1(message + 2) == 1)
 529                         memcpy(v4_prefix, prefix, 16);
 530                     else
 531                         memcpy(v6_prefix, prefix, 16);
 532                 }
 533                 /* extra data? */
 534                 if((u_int)rc < len - 10)
 535                     subtlvs_print(ndo, message + 12 + rc, message + 2 + len, type);
 536             }
 537         }
 538             break;
 539
 540         case MESSAGE_ROUTE_REQUEST: {
 541             if (!ndo->ndo_vflag)
 542                 ND_PRINT(" route-request");
 543             else {
 544                 int rc;
 545                 u_char prefix[16], ae, plen;
 546                 ND_PRINT("\n\tRoute Request ");
 547                 if(len < 2) goto invalid;
 548                 ae = EXTRACT_U_1(message + 2);
 549                 plen = EXTRACT_U_1(message + 3) + (EXTRACT_U_1(message + 2) == 1 ? 96 : 0);
 550                 rc = network_prefix(ae,
 551                                     EXTRACT_U_1(message + 3), 0,
 552                                     message + 4, NULL, len - 2, prefix);
 553                 if(rc < 0) goto invalid;
 554                 ND_PRINT("for %s",
 555                        ae == 0 ? "any" : format_prefix(ndo, prefix, plen));
 556             }
 557         }
 558             break;
 559
 560         case MESSAGE_SEQNO_REQUEST : {
 561             if (!ndo->ndo_vflag)
 562                 ND_PRINT(" seqno-request");
 563             else {
 564                 int rc;
 565                 u_short seqno;
 566                 u_char prefix[16], ae, plen;
 567                 ND_PRINT("\n\tSeqno Request ");
 568                 if(len < 14) goto invalid;
 569                 ae = EXTRACT_U_1(message + 2);
 570                 seqno = EXTRACT_BE_U_2(message + 4);
 571                 rc = network_prefix(ae,
 572                                     EXTRACT_U_1(message + 3), 0,
 573                                     message + 16, NULL, len - 14, prefix);
 574                 if(rc < 0) goto invalid;
 575                 plen = EXTRACT_U_1(message + 3) + (EXTRACT_U_1(message + 2) == 1 ? 96 : 0);
 576                 ND_PRINT("(%u hops) for %s seqno %u id %s",
 577                        EXTRACT_U_1(message + 6),
 578                        ae == 0 ? "invalid AE 0" : format_prefix(ndo, prefix, plen),
 579                        seqno, format_id(message + 8));
 580             }
 581         }
 582             break;
 583         case MESSAGE_TSPC :
 584             if (!ndo->ndo_vflag)
 585                 ND_PRINT(" tspc");
 586             else {
 587                 ND_PRINT("\n\tTS/PC ");
 588                 if(len < 6) goto invalid;
 589                 ND_PRINT("timestamp %u packetcounter %u", EXTRACT_BE_U_4(message + 4),
 590                           EXTRACT_BE_U_2(message + 2));
 591             }
 592             break;
 593         case MESSAGE_HMAC : {
 594             if (!ndo->ndo_vflag)
 595                 ND_PRINT(" hmac");
 596             else {
 597                 unsigned j;
 598                 ND_PRINT("\n\tHMAC ");
 599                 if(len < 18) goto invalid;
 600                 ND_PRINT("key-id %u digest-%u ", EXTRACT_BE_U_2(message + 2), len - 2);
 601                 for (j = 0; j < len - 2; j++)
 602                     ND_PRINT("%02X", EXTRACT_U_1(message + j + 4));
 603             }
 604         }
 605             break;
 606
 607         case MESSAGE_UPDATE_SRC_SPECIFIC : {
 608             if(!ndo->ndo_vflag) {
 609                 ND_PRINT(" ss-update");
 610             } else {
 611                 u_char prefix[16], src_prefix[16];
 612                 u_short interval, seqno, metric;
 613                 u_char ae, plen, src_plen, omitted;
 614                 int rc;
 615                 int parsed_len = 10;
 616                 ND_PRINT("\n\tSS-Update");
 617                 if(len < 10) goto invalid;
 618                 ae = EXTRACT_U_1(message + 2);
 619                 src_plen = EXTRACT_U_1(message + 3);
 620                 plen = EXTRACT_U_1(message + 4);
 621                 omitted = EXTRACT_U_1(message + 5);
 622                 interval = EXTRACT_BE_U_2(message + 6);
 623                 seqno = EXTRACT_BE_U_2(message + 8);
 624                 metric = EXTRACT_BE_U_2(message + 10);
 625                 rc = network_prefix(ae, plen, omitted, message + 2 + parsed_len,
 626                                     ae == 1 ? v4_prefix : v6_prefix,
 627                                     len - parsed_len, prefix);
 628                 if(rc < 0) goto invalid;
 629                 if(ae == 1)
 630                     plen += 96;
 631                 parsed_len += rc;
 632                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 633                                     NULL, len - parsed_len, src_prefix);
 634                 if(rc < 0) goto invalid;
 635                 if(ae == 1)
 636                     src_plen += 96;
 637                 parsed_len += rc;
 638
 639                 ND_PRINT(" %s from", format_prefix(ndo, prefix, plen));
 640                 ND_PRINT(" %s metric %u seqno %u interval %s",
 641                           format_prefix(ndo, src_prefix, src_plen),
 642                           metric, seqno, format_interval_update(interval));
 643                 /* extra data? */
 644                 if((u_int)parsed_len < len)
 645                     subtlvs_print(ndo, message + 2 + parsed_len,
 646                                   message + 2 + len, type);
 647             }
 648         }
 649             break;
 650
 651         case MESSAGE_REQUEST_SRC_SPECIFIC : {
 652             if(!ndo->ndo_vflag)
 653                 ND_PRINT(" ss-request");
 654             else {
 655                 int rc, parsed_len = 3;
 656                 u_char ae, plen, src_plen, prefix[16], src_prefix[16];
 657                 ND_PRINT("\n\tSS-Request ");
 658                 if(len < 3) goto invalid;
 659                 ae = EXTRACT_U_1(message + 2);
 660                 plen = EXTRACT_U_1(message + 3);
 661                 src_plen = EXTRACT_U_1(message + 4);
 662                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 663                                     NULL, len - parsed_len, prefix);
 664                 if(rc < 0) goto invalid;
 665                 if(ae == 1)
 666                     plen += 96;
 667                 parsed_len += rc;
 668                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 669                                     NULL, len - parsed_len, src_prefix);
 670                 if(rc < 0) goto invalid;
 671                 if(ae == 1)
 672                     src_plen += 96;
 673                 parsed_len += rc;
 674                 if(ae == 0) {
 675                     ND_PRINT("for any");
 676                 } else {
 677                     ND_PRINT("for (%s, ", format_prefix(ndo, prefix, plen));
 678                     ND_PRINT("%s)", format_prefix(ndo, src_prefix, src_plen));
 679                 }
 680             }
 681         }
 682             break;
 683
 684         case MESSAGE_MH_REQUEST_SRC_SPECIFIC : {
 685             if(!ndo->ndo_vflag)
 686                 ND_PRINT(" ss-mh-request");
 687             else {
 688                 int rc, parsed_len = 14;
 689                 u_short seqno;
 690                 u_char ae, plen, src_plen, prefix[16], src_prefix[16], hopc;
 691                 const u_char *router_id = NULL;
 692                 ND_PRINT("\n\tSS-MH-Request ");
 693                 if(len < 14) goto invalid;
 694                 ae = EXTRACT_U_1(message + 2);
 695                 plen = EXTRACT_U_1(message + 3);
 696                 seqno = EXTRACT_BE_U_2(message + 4);
 697                 hopc = EXTRACT_U_1(message + 6);
 698                 src_plen = EXTRACT_U_1(message + 7);
 699                 router_id = message + 8;
 700                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 701                                     NULL, len - parsed_len, prefix);
 702                 if(rc < 0) goto invalid;
 703                 if(ae == 1)
 704                     plen += 96;
 705                 parsed_len += rc;
 706                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 707                                     NULL, len - parsed_len, src_prefix);
 708                 if(rc < 0) goto invalid;
 709                 if(ae == 1)
 710                     src_plen += 96;
 711                 ND_PRINT("(%u hops) for (%s, ",
 712                           hopc, format_prefix(ndo, prefix, plen));
 713                 ND_PRINT("%s) seqno %u id %s",
 714                           format_prefix(ndo, src_prefix, src_plen),
 715                           seqno, format_id(router_id));
 716             }
 717         }
 718             break;
 719
 720         default:
 721             if (!ndo->ndo_vflag)
 722                 ND_PRINT(" unknown");
 723             else
 724                 ND_PRINT("\n\tUnknown message type %u", type);
 725         }
 726         i += len + 2;
 727     }
 728     return;
 729
 730  trunc:
 731     nd_print_trunc(ndo);
 732     return;
 733
 734  invalid:
 735     ND_PRINT("%s", istr);
 736     return;
 737 }