The Tcpdump Group git mirrors - tcpdump/blob - 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     if (len == 0)
 145         return;
 146     for (i = 0; i < len; i += optlen) {
 147         if (bp[i] == IP6OPT_PAD1)
 148             optlen = 1;
 149         else {
 150             if (i + 1 < len)
 151                 optlen = bp[i + 1] + 2;
 152             else
 153                 goto trunc;
 154         }
 155         if (i + optlen > len)
 156             goto trunc;
 157
 158         switch (bp[i]) {
 159         case IP6OPT_PAD1:
 160             printf("(pad1)");
 161             break;
 162         case IP6OPT_PADN:
 163             if (len - i < IP6OPT_MINLEN) {
 164                 printf("(padn: trunc)");
 165                 goto trunc;
 166             }
 167             printf("(padn)");
 168             break;
 169         case IP6OPT_ROUTER_ALERT:
 170             if (len - i < IP6OPT_RTALERT_LEN) {
 171                 printf("(rtalert: trunc)");
 172                 goto trunc;
 173             }
 174             if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
 175                 printf("(rtalert: invalid len %d)", bp[i + 1]);
 176                 goto trunc;
 177             }
 178             printf("(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2]));
 179             break;
 180         case IP6OPT_JUMBO:
 181             if (len - i < IP6OPT_JUMBO_LEN) {
 182                 printf("(jumbo: trunc)");
 183                 goto trunc;
 184             }
 185             if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
 186                 printf("(jumbo: invalid len %d)", bp[i + 1]);
 187                 goto trunc;
 188             }
 189             printf("(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2]));
 190             break;
 191         case IP6OPT_HOME_ADDRESS:
 192             if (len - i < IP6OPT_HOMEADDR_MINLEN) {
 193                 printf("(homeaddr: trunc)");
 194                 goto trunc;
 195             }
 196             if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
 197                 printf("(homeaddr: invalid len %d)", bp[i + 1]);
 198                 goto trunc;
 199             }
 200             printf("(homeaddr: %s", ip6addr_string(&bp[i + 2]));
 201             if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
 202                 ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN],
 203                     (optlen - IP6OPT_HOMEADDR_MINLEN));
 204             }
 205             printf(")");
 206             break;
 207         case IP6OPT_BINDING_UPDATE:
 208             if (len - i < IP6OPT_BU_MINLEN) {
 209                 printf("(bu: trunc)");
 210                 goto trunc;
 211             }
 212             if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) {
 213                 printf("(bu: invalid len %d)", bp[i + 1]);
 214                 goto trunc;
 215             }
 216             printf("(bu: ");
 217             if (bp[i + 2] & 0x80)
 218                     printf("A");
 219             if (bp[i + 2] & 0x40)
 220                     printf("H");
 221             if (bp[i + 2] & 0x20)
 222                     printf("S");
 223             if (bp[i + 2] & 0x10)
 224                     printf("D");
 225             if ((bp[i + 2] & 0x0f) || bp[i + 3] || bp[i + 4])
 226                     printf("res");
 227             printf(", sequence: %u", bp[i + 5]);
 228             printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 6]));
 229
 230             if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) {
 231                 ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN],
 232                     (optlen - IP6OPT_BU_MINLEN));
 233             }
 234             printf(")");
 235             break;
 236         case IP6OPT_BINDING_ACK:
 237             if (len - i < IP6OPT_BA_MINLEN) {
 238                 printf("(ba: trunc)");
 239                 goto trunc;
 240             }
 241             if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) {
 242                 printf("(ba: invalid len %d)", bp[i + 1]);
 243                 goto trunc;
 244             }
 245             printf("(ba: ");
 246             printf("status: %u", bp[i + 2]);
 247             if (bp[i + 3])
 248                     printf("res");
 249             printf(", sequence: %u", bp[i + 4]);
 250             printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 5]));
 251             printf(", refresh: %u", EXTRACT_32BITS(&bp[i + 9]));
 252
 253             if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) {
 254                 ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN],
 255                     (optlen - IP6OPT_BA_MINLEN));
 256             }
 257             printf(")");
 258             break;
 259         case IP6OPT_BINDING_REQ:
 260             if (len - i < IP6OPT_BR_MINLEN) {
 261                 printf("(br: trunc)");
 262                 goto trunc;
 263             }
 264             printf("(br");
 265             if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) {
 266                 ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN],
 267                     (optlen - IP6OPT_BR_MINLEN));
 268             }
 269             printf(")");
 270             break;
 271         default:
 272             if (len - i < IP6OPT_MINLEN) {
 273                 printf("(type %d: trunc)", bp[i]);
 274                 goto trunc;
 275             }
 276             printf("(opt_type 0x%02x: len=%d)", bp[i], bp[i + 1]);
 277             break;
 278         }
 279     }
 280     printf(" ");
 281
 282 #if 0
 283 end:
 284 #endif
 285     return;
 286
 287 trunc:
 288     printf("[trunc] ");
 289 }
 290
 291 int
 292 hbhopt_print(register const u_char *bp)
 293 {
 294     const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
 295     int hbhlen = 0;
 296
 297     TCHECK(dp->ip6h_len);
 298     hbhlen = (int)((dp->ip6h_len + 1) << 3);
 299     TCHECK2(*dp, hbhlen);
 300     printf("HBH ");
 301     if (vflag)
 302         ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
 303
 304     return(hbhlen);
 305
 306   trunc:
 307     fputs("[|HBH]", stdout);
 308     return(-1);
 309 }
 310
 311 int
 312 dstopt_print(register const u_char *bp)
 313 {
 314     const struct ip6_dest *dp = (struct ip6_dest *)bp;
 315     int dstoptlen = 0;
 316
 317     TCHECK(dp->ip6d_len);
 318     dstoptlen = (int)((dp->ip6d_len + 1) << 3);
 319     TCHECK2(*dp, dstoptlen);
 320     printf("DSTOPT ");
 321     if (vflag) {
 322         ip6_opt_print((const u_char *)dp + sizeof(*dp),
 323             dstoptlen - sizeof(*dp));
 324     }
 325
 326     return(dstoptlen);
 327
 328   trunc:
 329     fputs("[|DSTOPT]", stdout);
 330     return(-1);
 331 }
 332 #endif /* INET6 */