contrib/tcpdump/print-ip6opts.c

   1 /*
   2  * Copyright (C) 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #ifndef lint
  35 static const char rcsid[] _U_ =
  36      "@(#) $Header: /tcpdump/master/tcpdump/print-ip6opts.c,v 1.18 2005-04-20 22:18:50 guy Exp $";
  37 #endif
  38
  39 #ifdef INET6
  40 #include <tcpdump-stdinc.h>
  41
  42 #include <stdio.h>
  43
  44 #include "ip6.h"
  45
  46 #include "interface.h"
  47 #include "addrtoname.h"
  48 #include "extract.h"
  49
  50 /* items outside of rfc2292bis */
  51 #ifndef IP6OPT_MINLEN
  52 #define IP6OPT_MINLEN   2
  53 #endif
  54 #ifndef IP6OPT_RTALERT_LEN
  55 #define IP6OPT_RTALERT_LEN      4
  56 #endif
  57 #ifndef IP6OPT_JUMBO_LEN
  58 #define IP6OPT_JUMBO_LEN        6
  59 #endif
  60 #define IP6OPT_HOMEADDR_MINLEN 18
  61 #define IP6OPT_BU_MINLEN       10
  62 #define IP6OPT_BA_MINLEN       13
  63 #define IP6OPT_BR_MINLEN        2
  64 #define IP6SOPT_UI            0x2
  65 #define IP6SOPT_UI_MINLEN       4
  66 #define IP6SOPT_ALTCOA        0x3
  67 #define IP6SOPT_ALTCOA_MINLEN  18
  68 #define IP6SOPT_AUTH          0x4
  69 #define IP6SOPT_AUTH_MINLEN     6
  70
  71 static void ip6_sopt_print(const u_char *, int);
  72
  73 static void
  74 ip6_sopt_print(const u_char *bp, int len)
  75 {
  76     int i;
  77     int optlen;
  78
  79     for (i = 0; i < len; i += optlen) {
  80         if (bp[i] == IP6OPT_PAD1)
  81             optlen = 1;
  82         else {
  83             if (i + 1 < len)
  84                 optlen = bp[i + 1] + 2;
  85             else
  86                 goto trunc;
  87         }
  88         if (i + optlen > len)
  89             goto trunc;
  90
  91         switch (bp[i]) {
  92         case IP6OPT_PAD1:
  93             printf(", pad1");
  94             break;
  95         case IP6OPT_PADN:
  96             if (len - i < IP6OPT_MINLEN) {
  97                 printf(", padn: trunc");
  98                 goto trunc;
  99             }
 100             printf(", padn");
 101             break;
 102         case IP6SOPT_UI:
 103              if (len - i < IP6SOPT_UI_MINLEN) {
 104                 printf(", ui: trunc");
 105                 goto trunc;
 106             }
 107             printf(", ui: 0x%04x ", EXTRACT_16BITS(&bp[i + 2]));
 108             break;
 109         case IP6SOPT_ALTCOA:
 110              if (len - i < IP6SOPT_ALTCOA_MINLEN) {
 111                 printf(", altcoa: trunc");
 112                 goto trunc;
 113             }
 114             printf(", alt-CoA: %s", ip6addr_string(&bp[i+2]));
 115             break;
 116         case IP6SOPT_AUTH:
 117              if (len - i < IP6SOPT_AUTH_MINLEN) {
 118                 printf(", auth: trunc");
 119                 goto trunc;
 120             }
 121             printf(", auth spi: 0x%08x", EXTRACT_32BITS(&bp[i + 2]));
 122             break;
 123         default:
 124             if (len - i < IP6OPT_MINLEN) {
 125                 printf(", sopt_type %d: trunc)", bp[i]);
 126                 goto trunc;
 127             }
 128             printf(", sopt_type 0x%02x: len=%d", bp[i], bp[i + 1]);
 129             break;
 130         }
 131     }
 132     return;
 133
 134 trunc:
 135     printf("[trunc] ");
 136 }
 137
 138 void
 139 ip6_opt_print(const u_char *bp, int len)
 140 {
 141     int i;
 142     int optlen = 0;
 143
 144     for (i = 0; i < len; i += optlen) {
 145         if (bp[i] == IP6OPT_PAD1)
 146             optlen = 1;
 147         else {
 148             if (i + 1 < len)
 149                 optlen = bp[i + 1] + 2;
 150             else
 151                 goto trunc;
 152         }
 153         if (i + optlen > len)
 154             goto trunc;
 155
 156         switch (bp[i]) {
 157         case IP6OPT_PAD1:
 158             printf("(pad1)");
 159             break;
 160         case IP6OPT_PADN:
 161             if (len - i < IP6OPT_MINLEN) {
 162                 printf("(padn: trunc)");
 163                 goto trunc;
 164             }
 165             printf("(padn)");
 166             break;
 167         case IP6OPT_ROUTER_ALERT:
 168             if (len - i < IP6OPT_RTALERT_LEN) {
 169                 printf("(rtalert: trunc)");
 170                 goto trunc;
 171             }
 172             if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
 173                 printf("(rtalert: invalid len %d)", bp[i + 1]);
 174                 goto trunc;
 175             }
 176             printf("(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2]));
 177             break;
 178         case IP6OPT_JUMBO:
 179             if (len - i < IP6OPT_JUMBO_LEN) {
 180                 printf("(jumbo: trunc)");
 181                 goto trunc;
 182             }
 183             if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
 184                 printf("(jumbo: invalid len %d)", bp[i + 1]);
 185                 goto trunc;
 186             }
 187             printf("(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2]));
 188             break;
 189         case IP6OPT_HOME_ADDRESS:
 190             if (len - i < IP6OPT_HOMEADDR_MINLEN) {
 191                 printf("(homeaddr: trunc)");
 192                 goto trunc;
 193             }
 194             if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
 195                 printf("(homeaddr: invalid len %d)", bp[i + 1]);
 196                 goto trunc;
 197             }
 198             printf("(homeaddr: %s", ip6addr_string(&bp[i + 2]));
 199             if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
 200                 ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN],
 201                     (optlen - IP6OPT_HOMEADDR_MINLEN));
 202             }
 203             printf(")");
 204             break;
 205         case IP6OPT_BINDING_UPDATE:
 206             if (len - i < IP6OPT_BU_MINLEN) {
 207                 printf("(bu: trunc)");
 208                 goto trunc;
 209             }
 210             if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) {
 211                 printf("(bu: invalid len %d)", bp[i + 1]);
 212                 goto trunc;
 213             }
 214             printf("(bu: ");
 215             if (bp[i + 2] & 0x80)
 216                     printf("A");
 217             if (bp[i + 2] & 0x40)
 218                     printf("H");
 219             if (bp[i + 2] & 0x20)
 220                     printf("S");
 221             if (bp[i + 2] & 0x10)
 222                     printf("D");
 223             if ((bp[i + 2] & 0x0f) || bp[i + 3] || bp[i + 4])
 224                     printf("res");
 225             printf(", sequence: %u", bp[i + 5]);
 226             printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 6]));
 227
 228             if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) {
 229                 ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN],
 230                     (optlen - IP6OPT_BU_MINLEN));
 231             }
 232             printf(")");
 233             break;
 234         case IP6OPT_BINDING_ACK:
 235             if (len - i < IP6OPT_BA_MINLEN) {
 236                 printf("(ba: trunc)");
 237                 goto trunc;
 238             }
 239             if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) {
 240                 printf("(ba: invalid len %d)", bp[i + 1]);
 241                 goto trunc;
 242             }
 243             printf("(ba: ");
 244             printf("status: %u", bp[i + 2]);
 245             if (bp[i + 3])
 246                     printf("res");
 247             printf(", sequence: %u", bp[i + 4]);
 248             printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 5]));
 249             printf(", refresh: %u", EXTRACT_32BITS(&bp[i + 9]));
 250
 251             if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) {
 252                 ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN],
 253                     (optlen - IP6OPT_BA_MINLEN));
 254             }
 255             printf(")");
 256             break;
 257         case IP6OPT_BINDING_REQ:
 258             if (len - i < IP6OPT_BR_MINLEN) {
 259                 printf("(br: trunc)");
 260                 goto trunc;
 261             }
 262             printf("(br");
 263             if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) {
 264                 ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN],
 265                     (optlen - IP6OPT_BR_MINLEN));
 266             }
 267             printf(")");
 268             break;
 269         default:
 270             if (len - i < IP6OPT_MINLEN) {
 271                 printf("(type %d: trunc)", bp[i]);
 272                 goto trunc;
 273             }
 274             printf("(opt_type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
 275             break;
 276         }
 277     }
 278
 279 #if 0
 280 end:
 281 #endif
 282     return;
 283
 284 trunc:
 285     printf("[trunc] ");
 286 }
 287
 288 int
 289 hbhopt_print(register const u_char *bp)
 290 {
 291     const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
 292     int hbhlen = 0;
 293
 294     TCHECK(dp->ip6h_len);
 295     hbhlen = (int)((dp->ip6h_len + 1) << 3);
 296     TCHECK2(*dp, hbhlen);
 297     printf("HBH ");
 298     if (vflag)
 299         ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
 300
 301     return(hbhlen);
 302
 303   trunc:
 304     fputs("[|HBH]", stdout);
 305     return(-1);
 306 }
 307
 308 int
 309 dstopt_print(register const u_char *bp)
 310 {
 311     const struct ip6_dest *dp = (struct ip6_dest *)bp;
 312     int dstoptlen = 0;
 313
 314     TCHECK(dp->ip6d_len);
 315     dstoptlen = (int)((dp->ip6d_len + 1) << 3);
 316     TCHECK2(*dp, dstoptlen);
 317     printf("DSTOPT ");
 318     if (vflag) {
 319         ip6_opt_print((const u_char *)dp + sizeof(*dp),
 320             dstoptlen - sizeof(*dp));
 321     }
 322
 323     return(dstoptlen);
 324
 325   trunc:
 326     fputs("[|DSTOPT]", stdout);
 327     return(-1);
 328 }
 329 #endif /* INET6 */