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 static const char tstr[] = "[|babel]";
  45
  46 static void babel_print_v2(netdissect_options *, const u_char *cp, u_int length);
  47
  48 void
  49 babel_print(netdissect_options *ndo,
  50             const u_char *cp, u_int length)
  51 {
  52     ND_PRINT((ndo, "babel"));
  53
  54     ND_TCHECK_4(cp);
  55
  56     if(cp[0] != 42) {
  57         ND_PRINT((ndo, " invalid header"));
  58         return;
  59     } else {
  60         ND_PRINT((ndo, " %d", cp[1]));
  61     }
  62
  63     switch(cp[1]) {
  64     case 2:
  65         babel_print_v2(ndo, cp, length);
  66         break;
  67     default:
  68         ND_PRINT((ndo, " unknown version"));
  69         break;
  70     }
  71
  72     return;
  73
  74  trunc:
  75     ND_PRINT((ndo, " %s", tstr));
  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_REQUEST 9
  90 #define MESSAGE_MH_REQUEST 10
  91 #define MESSAGE_TSPC 11
  92 #define MESSAGE_HMAC 12
  93 #define MESSAGE_UPDATE_SRC_SPECIFIC 13
  94 #define MESSAGE_REQUEST_SRC_SPECIFIC 14
  95 #define MESSAGE_MH_REQUEST_SRC_SPECIFIC 15
  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     snprintf(buf, 25, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
 115              id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7]);
 116     buf[24] = '\0';
 117     return buf;
 118 }
 119
 120 static const unsigned char v4prefix[16] =
 121     {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
 122
 123 static const char *
 124 format_prefix(netdissect_options *ndo, const u_char *prefix, unsigned char plen)
 125 {
 126     static char buf[50];
 127     if(plen >= 96 && memcmp(prefix, v4prefix, 12) == 0)
 128         snprintf(buf, 50, "%s/%u", ipaddr_string(ndo, prefix + 12), plen - 96);
 129     else
 130         snprintf(buf, 50, "%s/%u", ip6addr_string(ndo, prefix), plen);
 131     buf[49] = '\0';
 132     return buf;
 133 }
 134
 135 static const char *
 136 format_address(netdissect_options *ndo, const u_char *prefix)
 137 {
 138     if(memcmp(prefix, v4prefix, 12) == 0)
 139         return ipaddr_string(ndo, prefix + 12);
 140     else
 141         return ip6addr_string(ndo, prefix);
 142 }
 143
 144 static const char *
 145 format_interval(const uint16_t i)
 146 {
 147     static char buf[sizeof("000.00s")];
 148
 149     if (i == 0)
 150         return "0.0s (bogus)";
 151     snprintf(buf, sizeof(buf), "%u.%02us", i / 100, i % 100);
 152     return buf;
 153 }
 154
 155 static const char *
 156 format_interval_update(const uint16_t i)
 157 {
 158     return i == 0xFFFF ? "infinity" : format_interval(i);
 159 }
 160
 161 static const char *
 162 format_timestamp(const uint32_t i)
 163 {
 164     static char buf[sizeof("0000.000000s")];
 165     snprintf(buf, sizeof(buf), "%u.%06us", i / 1000000, i % 1000000);
 166     return buf;
 167 }
 168
 169 /* Return number of octets consumed from the input buffer (not the prefix length
 170  * in bytes), or -1 for encoding error. */
 171 static int
 172 network_prefix(int ae, int plen, unsigned int omitted,
 173                const unsigned char *p, const unsigned char *dp,
 174                unsigned int len, unsigned char *p_r)
 175 {
 176     unsigned pb;
 177     unsigned char prefix[16];
 178     int consumed = 0;
 179
 180     if(plen >= 0)
 181         pb = (plen + 7) / 8;
 182     else if(ae == 1)
 183         pb = 4;
 184     else
 185         pb = 16;
 186
 187     if(pb > 16)
 188         return -1;
 189
 190     memset(prefix, 0, 16);
 191
 192     switch(ae) {
 193     case 0: break;
 194     case 1:
 195         if(omitted > 4 || pb > 4 || (pb > omitted && len < pb - omitted))
 196             return -1;
 197         memcpy(prefix, v4prefix, 12);
 198         if(omitted) {
 199             if (dp == NULL) return -1;
 200             memcpy(prefix, dp, 12 + omitted);
 201         }
 202         if(pb > omitted) {
 203             memcpy(prefix + 12 + omitted, p, pb - omitted);
 204             consumed = pb - omitted;
 205         }
 206         break;
 207     case 2:
 208         if(omitted > 16 || (pb > omitted && len < pb - omitted))
 209             return -1;
 210         if(omitted) {
 211             if (dp == NULL) return -1;
 212             memcpy(prefix, dp, omitted);
 213         }
 214         if(pb > omitted) {
 215             memcpy(prefix + omitted, p, pb - omitted);
 216             consumed = pb - omitted;
 217         }
 218         break;
 219     case 3:
 220         if(pb > 8 && len < pb - 8) return -1;
 221         prefix[0] = 0xfe;
 222         prefix[1] = 0x80;
 223         if(pb > 8) {
 224             memcpy(prefix + 8, p, pb - 8);
 225             consumed = pb - 8;
 226         }
 227         break;
 228     default:
 229         return -1;
 230     }
 231
 232     memcpy(p_r, prefix, 16);
 233     return consumed;
 234 }
 235
 236 static int
 237 network_address(int ae, const unsigned char *a, unsigned int len,
 238                 unsigned char *a_r)
 239 {
 240     return network_prefix(ae, -1, 0, a, NULL, len, a_r);
 241 }
 242
 243 /*
 244  * Sub-TLVs consume the "extra data" of Babel TLVs (see Section 4.3 of RFC6126),
 245  * their encoding is similar to the encoding of TLVs, but the type namespace is
 246  * different:
 247  *
 248  * o Type 0 stands for Pad1 sub-TLV with the same encoding as the Pad1 TLV.
 249  * o Type 1 stands for PadN sub-TLV with the same encoding as the PadN TLV.
 250  * o Type 2 stands for Diversity sub-TLV, which propagates diversity routing
 251  *   data. Its body is a variable-length sequence of 8-bit unsigned integers,
 252  *   each representing per-hop number of interferring radio channel for the
 253  *   prefix. Channel 0 is invalid and must not be used in the sub-TLV, channel
 254  *   255 interferes with any other channel.
 255  * o Type 3 stands for Timestamp sub-TLV, used to compute RTT between
 256  *   neighbours. In the case of a Hello TLV, the body stores a 32-bits
 257  *   timestamp, while in the case of a IHU TLV, two 32-bits timestamps are
 258  *   stored.
 259  *
 260  * Sub-TLV types 0 and 1 are valid for any TLV type, whether sub-TLV type 2 is
 261  * only valid for TLV type 8 (Update). Note that within an Update TLV a missing
 262  * Diversity sub-TLV is not the same as a Diversity sub-TLV with an empty body.
 263  * The former would mean a lack of any claims about the interference, and the
 264  * latter would state that interference is definitely absent.
 265  * A type 3 sub-TLV is valid both for Hello and IHU TLVs, though the exact
 266  * semantic of the sub-TLV is different in each case.
 267  */
 268 static void
 269 subtlvs_print(netdissect_options *ndo,
 270               const u_char *cp, const u_char *ep, const uint8_t tlv_type)
 271 {
 272     uint8_t subtype, sublen;
 273     const char *sep;
 274     uint32_t t1, t2;
 275
 276     while (cp < ep) {
 277         subtype = EXTRACT_U_1(cp);
 278         cp++;
 279         if(subtype == MESSAGE_SUB_PAD1) {
 280             ND_PRINT((ndo, " sub-pad1"));
 281             continue;
 282         }
 283         if(cp == ep)
 284             goto invalid;
 285         sublen = EXTRACT_U_1(cp);
 286         cp++;
 287         if(cp + sublen > ep)
 288             goto invalid;
 289
 290         switch(subtype) {
 291         case MESSAGE_SUB_PADN:
 292             ND_PRINT((ndo, " sub-padn"));
 293             cp += sublen;
 294             break;
 295         case MESSAGE_SUB_DIVERSITY:
 296             ND_PRINT((ndo, " sub-diversity"));
 297             if (sublen == 0) {
 298                 ND_PRINT((ndo, " empty"));
 299                 break;
 300             }
 301             sep = " ";
 302             while(sublen--) {
 303                 ND_PRINT((ndo, "%s%s", sep, tok2str(diversity_str, "%u", EXTRACT_U_1(cp))));
 304                 cp++;
 305                 sep = "-";
 306             }
 307             if(tlv_type != MESSAGE_UPDATE &&
 308                tlv_type != MESSAGE_UPDATE_SRC_SPECIFIC)
 309                 ND_PRINT((ndo, " (bogus)"));
 310             break;
 311         case MESSAGE_SUB_TIMESTAMP:
 312             ND_PRINT((ndo, " sub-timestamp"));
 313             if(tlv_type == MESSAGE_HELLO) {
 314                 if(sublen < 4)
 315                     goto invalid;
 316                 t1 = EXTRACT_BE_U_4(cp);
 317                 ND_PRINT((ndo, " %s", format_timestamp(t1)));
 318             } else if(tlv_type == MESSAGE_IHU) {
 319                 if(sublen < 8)
 320                     goto invalid;
 321                 t1 = EXTRACT_BE_U_4(cp);
 322                 ND_PRINT((ndo, " %s", format_timestamp(t1)));
 323                 t2 = EXTRACT_BE_U_4(cp + 4);
 324                 ND_PRINT((ndo, "|%s", format_timestamp(t2)));
 325             } else
 326                 ND_PRINT((ndo, " (bogus)"));
 327             cp += sublen;
 328             break;
 329         default:
 330             ND_PRINT((ndo, " sub-unknown-0x%02x", subtype));
 331             cp += sublen;
 332         } /* switch */
 333     } /* while */
 334     return;
 335
 336  invalid:
 337     ND_PRINT((ndo, "%s", istr));
 338 }
 339
 340 #define ICHECK(i, l) \
 341         if ((i) + (l) > bodylen || (i) + (l) > length) goto invalid;
 342
 343 static void
 344 babel_print_v2(netdissect_options *ndo,
 345                const u_char *cp, u_int length)
 346 {
 347     u_int i;
 348     u_short bodylen;
 349     u_char v4_prefix[16] =
 350         {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
 351     u_char v6_prefix[16] = {0};
 352
 353     ND_TCHECK_4(cp);
 354     if (length < 4)
 355         goto invalid;
 356     bodylen = EXTRACT_BE_U_2(cp + 2);
 357     ND_PRINT((ndo, " (%u)", bodylen));
 358
 359     /* Process the TLVs in the body */
 360     i = 0;
 361     while(i < bodylen) {
 362         const u_char *message;
 363         u_int type, len;
 364
 365         message = cp + 4 + i;
 366
 367         ND_TCHECK_1(message);
 368         if((type = message[0]) == MESSAGE_PAD1) {
 369             ND_PRINT((ndo, ndo->ndo_vflag ? "\n\tPad 1" : " pad1"));
 370             i += 1;
 371             continue;
 372         }
 373
 374         ND_TCHECK_2(message);
 375         ICHECK(i, 2);
 376         len = message[1];
 377
 378         ND_TCHECK2(*message, 2 + len);
 379         ICHECK(i, 2 + len);
 380
 381         switch(type) {
 382         case MESSAGE_PADN: {
 383             if (!ndo->ndo_vflag)
 384                 ND_PRINT((ndo, " padN"));
 385             else
 386                 ND_PRINT((ndo, "\n\tPad %d", len + 2));
 387         }
 388             break;
 389
 390         case MESSAGE_ACK_REQ: {
 391             u_short nonce, interval;
 392             if (!ndo->ndo_vflag)
 393                 ND_PRINT((ndo, " ack-req"));
 394             else {
 395                 ND_PRINT((ndo, "\n\tAcknowledgment Request "));
 396                 if(len < 6) goto invalid;
 397                 nonce = EXTRACT_BE_U_2(message + 4);
 398                 interval = EXTRACT_BE_U_2(message + 6);
 399                 ND_PRINT((ndo, "%04x %s", nonce, format_interval(interval)));
 400             }
 401         }
 402             break;
 403
 404         case MESSAGE_ACK: {
 405             u_short nonce;
 406             if (!ndo->ndo_vflag)
 407                 ND_PRINT((ndo, " ack"));
 408             else {
 409                 ND_PRINT((ndo, "\n\tAcknowledgment "));
 410                 if(len < 2) goto invalid;
 411                 nonce = EXTRACT_BE_U_2(message + 2);
 412                 ND_PRINT((ndo, "%04x", nonce));
 413             }
 414         }
 415             break;
 416
 417         case MESSAGE_HELLO:  {
 418             u_short seqno, interval;
 419             if (!ndo->ndo_vflag)
 420                 ND_PRINT((ndo, " hello"));
 421             else {
 422                 ND_PRINT((ndo, "\n\tHello "));
 423                 if(len < 6) goto invalid;
 424                 seqno = EXTRACT_BE_U_2(message + 4);
 425                 interval = EXTRACT_BE_U_2(message + 6);
 426                 ND_PRINT((ndo, "seqno %u interval %s", seqno, format_interval(interval)));
 427                 /* Extra data. */
 428                 if(len > 6)
 429                     subtlvs_print(ndo, message + 8, message + 2 + len, type);
 430             }
 431         }
 432             break;
 433
 434         case MESSAGE_IHU: {
 435             unsigned short txcost, interval;
 436             if (!ndo->ndo_vflag)
 437                 ND_PRINT((ndo, " ihu"));
 438             else {
 439                 u_char address[16];
 440                 int rc;
 441                 ND_PRINT((ndo, "\n\tIHU "));
 442                 if(len < 6) goto invalid;
 443                 txcost = EXTRACT_BE_U_2(message + 4);
 444                 interval = EXTRACT_BE_U_2(message + 6);
 445                 rc = network_address(message[2], message + 8, len - 6, address);
 446                 if(rc < 0) { ND_PRINT((ndo, "%s", tstr)); break; }
 447                 ND_PRINT((ndo, "%s txcost %u interval %s",
 448                        format_address(ndo, address), txcost, format_interval(interval)));
 449                 /* Extra data. */
 450                 if((u_int)rc < len - 6)
 451                     subtlvs_print(ndo, message + 8 + rc, message + 2 + len,
 452                                   type);
 453             }
 454         }
 455             break;
 456
 457         case MESSAGE_ROUTER_ID: {
 458             if (!ndo->ndo_vflag)
 459                 ND_PRINT((ndo, " router-id"));
 460             else {
 461                 ND_PRINT((ndo, "\n\tRouter Id"));
 462                 if(len < 10) goto invalid;
 463                 ND_PRINT((ndo, " %s", format_id(message + 4)));
 464             }
 465         }
 466             break;
 467
 468         case MESSAGE_NH: {
 469             if (!ndo->ndo_vflag)
 470                 ND_PRINT((ndo, " nh"));
 471             else {
 472                 int rc;
 473                 u_char nh[16];
 474                 ND_PRINT((ndo, "\n\tNext Hop"));
 475                 if(len < 2) goto invalid;
 476                 rc = network_address(message[2], message + 4, len - 2, nh);
 477                 if(rc < 0) goto invalid;
 478                 ND_PRINT((ndo, " %s", format_address(ndo, nh)));
 479             }
 480         }
 481             break;
 482
 483         case MESSAGE_UPDATE: {
 484             if (!ndo->ndo_vflag) {
 485                 ND_PRINT((ndo, " update"));
 486                 if(len < 1)
 487                     ND_PRINT((ndo, "/truncated"));
 488                 else
 489                     ND_PRINT((ndo, "%s%s%s",
 490                            (message[3] & 0x80) ? "/prefix": "",
 491                            (message[3] & 0x40) ? "/id" : "",
 492                            (message[3] & 0x3f) ? "/unknown" : ""));
 493             } else {
 494                 u_short interval, seqno, metric;
 495                 u_char plen;
 496                 int rc;
 497                 u_char prefix[16];
 498                 ND_PRINT((ndo, "\n\tUpdate"));
 499                 if(len < 10) goto invalid;
 500                 plen = message[4] + (message[2] == 1 ? 96 : 0);
 501                 rc = network_prefix(message[2], message[4], message[5],
 502                                     message + 12,
 503                                     message[2] == 1 ? v4_prefix : v6_prefix,
 504                                     len - 10, prefix);
 505                 if(rc < 0) goto invalid;
 506                 interval = EXTRACT_BE_U_2(message + 6);
 507                 seqno = EXTRACT_BE_U_2(message + 8);
 508                 metric = EXTRACT_BE_U_2(message + 10);
 509                 ND_PRINT((ndo, "%s%s%s %s metric %u seqno %u interval %s",
 510                        (message[3] & 0x80) ? "/prefix": "",
 511                        (message[3] & 0x40) ? "/id" : "",
 512                        (message[3] & 0x3f) ? "/unknown" : "",
 513                        format_prefix(ndo, prefix, plen),
 514                        metric, seqno, format_interval_update(interval)));
 515                 if(message[3] & 0x80) {
 516                     if(message[2] == 1)
 517                         memcpy(v4_prefix, prefix, 16);
 518                     else
 519                         memcpy(v6_prefix, prefix, 16);
 520                 }
 521                 /* extra data? */
 522                 if((u_int)rc < len - 10)
 523                     subtlvs_print(ndo, message + 12 + rc, message + 2 + len, type);
 524             }
 525         }
 526             break;
 527
 528         case MESSAGE_REQUEST: {
 529             if (!ndo->ndo_vflag)
 530                 ND_PRINT((ndo, " request"));
 531             else {
 532                 int rc;
 533                 u_char prefix[16], plen;
 534                 ND_PRINT((ndo, "\n\tRequest "));
 535                 if(len < 2) goto invalid;
 536                 plen = message[3] + (message[2] == 1 ? 96 : 0);
 537                 rc = network_prefix(message[2], message[3], 0,
 538                                     message + 4, NULL, len - 2, prefix);
 539                 if(rc < 0) goto invalid;
 540                 ND_PRINT((ndo, "for %s",
 541                        message[2] == 0 ? "any" : format_prefix(ndo, prefix, plen)));
 542             }
 543         }
 544             break;
 545
 546         case MESSAGE_MH_REQUEST : {
 547             if (!ndo->ndo_vflag)
 548                 ND_PRINT((ndo, " mh-request"));
 549             else {
 550                 int rc;
 551                 u_short seqno;
 552                 u_char prefix[16], plen;
 553                 ND_PRINT((ndo, "\n\tMH-Request "));
 554                 if(len < 14) goto invalid;
 555                 seqno = EXTRACT_BE_U_2(message + 4);
 556                 rc = network_prefix(message[2], message[3], 0,
 557                                     message + 16, NULL, len - 14, prefix);
 558                 if(rc < 0) goto invalid;
 559                 plen = message[3] + (message[2] == 1 ? 96 : 0);
 560                 ND_PRINT((ndo, "(%u hops) for %s seqno %u id %s",
 561                        message[6], format_prefix(ndo, prefix, plen),
 562                        seqno, format_id(message + 8)));
 563             }
 564         }
 565             break;
 566         case MESSAGE_TSPC :
 567             if (!ndo->ndo_vflag)
 568                 ND_PRINT((ndo, " tspc"));
 569             else {
 570                 ND_PRINT((ndo, "\n\tTS/PC "));
 571                 if(len < 6) goto invalid;
 572                 ND_PRINT((ndo, "timestamp %u packetcounter %u", EXTRACT_BE_U_4(message + 4),
 573                           EXTRACT_BE_U_2(message + 2)));
 574             }
 575             break;
 576         case MESSAGE_HMAC : {
 577             if (!ndo->ndo_vflag)
 578                 ND_PRINT((ndo, " hmac"));
 579             else {
 580                 unsigned j;
 581                 ND_PRINT((ndo, "\n\tHMAC "));
 582                 if(len < 18) goto invalid;
 583                 ND_PRINT((ndo, "key-id %u digest-%u ", EXTRACT_BE_U_2(message + 2), len - 2));
 584                 for (j = 0; j < len - 2; j++)
 585                     ND_PRINT((ndo, "%02X", message[4 + j]));
 586             }
 587         }
 588             break;
 589
 590         case MESSAGE_UPDATE_SRC_SPECIFIC : {
 591             if(!ndo->ndo_vflag) {
 592                 ND_PRINT((ndo, " ss-update"));
 593             } else {
 594                 u_char prefix[16], src_prefix[16];
 595                 u_short interval, seqno, metric;
 596                 u_char ae, plen, src_plen, omitted;
 597                 int rc;
 598                 int parsed_len = 10;
 599                 ND_PRINT((ndo, "\n\tSS-Update"));
 600                 if(len < 10) goto invalid;
 601                 ae = message[2];
 602                 src_plen = message[3];
 603                 plen = message[4];
 604                 omitted = message[5];
 605                 interval = EXTRACT_BE_U_2(message + 6);
 606                 seqno = EXTRACT_BE_U_2(message + 8);
 607                 metric = EXTRACT_BE_U_2(message + 10);
 608                 rc = network_prefix(ae, plen, omitted, message + 2 + parsed_len,
 609                                     ae == 1 ? v4_prefix : v6_prefix,
 610                                     len - parsed_len, prefix);
 611                 if(rc < 0) goto invalid;
 612                 if(ae == 1)
 613                     plen += 96;
 614                 parsed_len += rc;
 615                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 616                                     NULL, len - parsed_len, src_prefix);
 617                 if(rc < 0) goto invalid;
 618                 if(ae == 1)
 619                     src_plen += 96;
 620                 parsed_len += rc;
 621
 622                 ND_PRINT((ndo, " %s from", format_prefix(ndo, prefix, plen)));
 623                 ND_PRINT((ndo, " %s metric %u seqno %u interval %s",
 624                           format_prefix(ndo, src_prefix, src_plen),
 625                           metric, seqno, format_interval_update(interval)));
 626                 /* extra data? */
 627                 if((u_int)parsed_len < len)
 628                     subtlvs_print(ndo, message + 2 + parsed_len,
 629                                   message + 2 + len, type);
 630             }
 631         }
 632             break;
 633
 634         case MESSAGE_REQUEST_SRC_SPECIFIC : {
 635             if(!ndo->ndo_vflag)
 636                 ND_PRINT((ndo, " ss-request"));
 637             else {
 638                 int rc, parsed_len = 3;
 639                 u_char ae, plen, src_plen, prefix[16], src_prefix[16];
 640                 ND_PRINT((ndo, "\n\tSS-Request "));
 641                 if(len < 3) goto invalid;
 642                 ae = message[2];
 643                 plen = message[3];
 644                 src_plen = message[4];
 645                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 646                                     NULL, len - parsed_len, prefix);
 647                 if(rc < 0) goto invalid;
 648                 if(ae == 1)
 649                     plen += 96;
 650                 parsed_len += rc;
 651                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 652                                     NULL, len - parsed_len, src_prefix);
 653                 if(rc < 0) goto invalid;
 654                 if(ae == 1)
 655                     src_plen += 96;
 656                 parsed_len += rc;
 657                 if(ae == 0) {
 658                     ND_PRINT((ndo, "for any"));
 659                 } else {
 660                     ND_PRINT((ndo, "for (%s, ", format_prefix(ndo, prefix, plen)));
 661                     ND_PRINT((ndo, "%s)", format_prefix(ndo, src_prefix, src_plen)));
 662                 }
 663             }
 664         }
 665             break;
 666
 667         case MESSAGE_MH_REQUEST_SRC_SPECIFIC : {
 668             if(!ndo->ndo_vflag)
 669                 ND_PRINT((ndo, " ss-mh-request"));
 670             else {
 671                 int rc, parsed_len = 14;
 672                 u_short seqno;
 673                 u_char ae, plen, src_plen, prefix[16], src_prefix[16], hopc;
 674                 const u_char *router_id = NULL;
 675                 ND_PRINT((ndo, "\n\tSS-MH-Request "));
 676                 if(len < 14) goto invalid;
 677                 ae = message[2];
 678                 plen = message[3];
 679                 seqno = EXTRACT_BE_U_2(message + 4);
 680                 hopc = message[6];
 681                 src_plen = message[7];
 682                 router_id = message + 8;
 683                 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
 684                                     NULL, len - parsed_len, prefix);
 685                 if(rc < 0) goto invalid;
 686                 if(ae == 1)
 687                     plen += 96;
 688                 parsed_len += rc;
 689                 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
 690                                     NULL, len - parsed_len, src_prefix);
 691                 if(rc < 0) goto invalid;
 692                 if(ae == 1)
 693                     src_plen += 96;
 694                 ND_PRINT((ndo, "(%u hops) for (%s, ",
 695                           hopc, format_prefix(ndo, prefix, plen)));
 696                 ND_PRINT((ndo, "%s) seqno %u id %s",
 697                           format_prefix(ndo, src_prefix, src_plen),
 698                           seqno, format_id(router_id)));
 699             }
 700         }
 701             break;
 702
 703         default:
 704             if (!ndo->ndo_vflag)
 705                 ND_PRINT((ndo, " unknown"));
 706             else
 707                 ND_PRINT((ndo, "\n\tUnknown message type %d", type));
 708         }
 709         i += len + 2;
 710     }
 711     return;
 712
 713  trunc:
 714     ND_PRINT((ndo, " %s", tstr));
 715     return;
 716
 717  invalid:
 718     ND_PRINT((ndo, "%s", istr));
 719     return;
 720 }