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[] =
  36      "@(#) $Header: /tcpdump/master/tcpdump/print-ip6opts.c,v 1.12 2002-08-01 08:53:11 risso 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
  49 /* items outside of rfc2292bis */
  50 #ifndef IP6OPT_MINLEN
  51 #define IP6OPT_MINLEN   2
  52 #endif
  53 #ifndef IP6OPT_RTALERT_LEN
  54 #define IP6OPT_RTALERT_LEN      4
  55 #endif
  56 #ifndef IP6OPT_JUMBO_LEN
  57 #define IP6OPT_JUMBO_LEN        6
  58 #endif
  59 #define IP6OPT_HOMEADDR_MINLEN 18
  60 #define IP6OPT_BU_MINLEN       10
  61 #define IP6OPT_BA_MINLEN       13
  62 #define IP6OPT_BR_MINLEN        2
  63 #define IP6SOPT_UI            0x2
  64 #define IP6SOPT_UI_MINLEN       4
  65 #define IP6SOPT_ALTCOA        0x3
  66 #define IP6SOPT_ALTCOA_MINLEN  18
  67 #define IP6SOPT_AUTH          0x4
  68 #define IP6SOPT_AUTH_MINLEN     6
  69
  70 static void ip6_sopt_print(const u_char *, int);
  71
  72 static void
  73 ip6_sopt_print(const u_char *bp, int len)
  74 {
  75     int i;
  76     int optlen;
  77
  78     for (i = 0; i < len; i += optlen) {
  79         if (bp[i] == IP6OPT_PAD1)
  80             optlen = 1;
  81         else {
  82             if (i + 1 < len)
  83                 optlen = bp[i + 1] + 2;
  84             else
  85                 goto trunc;
  86         }
  87         if (i + optlen > len)
  88             goto trunc;
  89
  90         switch (bp[i]) {
  91         case IP6OPT_PAD1:
  92             printf(", pad1");
  93             break;
  94         case IP6OPT_PADN:
  95             if (len - i < IP6OPT_MINLEN) {
  96                 printf(", padn: trunc");
  97                 goto trunc;
  98             }
  99             printf(", padn");
 100             break;
 101         case IP6SOPT_UI:
 102              if (len - i < IP6SOPT_UI_MINLEN) {
 103                 printf(", ui: trunc");
 104                 goto trunc;
 105             }
 106             printf(", ui: 0x%04x ", ntohs(*(u_int16_t *)&bp[i + 2]));
 107             break;
 108         case IP6SOPT_ALTCOA:
 109              if (len - i < IP6SOPT_ALTCOA_MINLEN) {
 110                 printf(", altcoa: trunc");
 111                 goto trunc;
 112             }
 113             printf(", alt-CoA: %s", ip6addr_string(&bp[i+2]));
 114             break;
 115         case IP6SOPT_AUTH:
 116              if (len - i < IP6SOPT_AUTH_MINLEN) {
 117                 printf(", auth: trunc");
 118                 goto trunc;
 119             }
 120             printf(", auth spi: 0x%08x",
 121                    (u_int32_t)ntohl(*(u_int32_t *)&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;
 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) ", ntohs(*(u_int16_t *)&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) ", (u_int32_t)ntohl(*(u_int32_t *)&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",
 227                 (u_int32_t)ntohl(*(u_int32_t *)&bp[i + 6]));
 228
 229             if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) {
 230                 ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN],
 231                     (optlen - IP6OPT_BU_MINLEN));
 232             }
 233             printf(")");
 234             break;
 235         case IP6OPT_BINDING_ACK:
 236             if (len - i < IP6OPT_BA_MINLEN) {
 237                 printf("(ba: trunc)");
 238                 goto trunc;
 239             }
 240             if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) {
 241                 printf("(ba: invalid len %d)", bp[i + 1]);
 242                 goto trunc;
 243             }
 244             printf("(ba: ");
 245             printf("status: %u", bp[i + 2]);
 246             if (bp[i + 3])
 247                     printf("res");
 248             printf(", sequence: %u", bp[i + 4]);
 249             printf(", lifetime: %u",
 250                 (u_int32_t)ntohl(*(u_int32_t *)&bp[i + 5]));
 251             printf(", refresh: %u",
 252                 (u_int32_t)ntohl(*(u_int32_t *)&bp[i + 9]));
 253
 254             if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) {
 255                 ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN],
 256                     (optlen - IP6OPT_BA_MINLEN));
 257             }
 258             printf(")");
 259             break;
 260         case IP6OPT_BINDING_REQ:
 261             if (len - i < IP6OPT_BR_MINLEN) {
 262                 printf("(br: trunc)");
 263                 goto trunc;
 264             }
 265             printf("(br");
 266             if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) {
 267                 ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN],
 268                     (optlen - IP6OPT_BR_MINLEN));
 269             }
 270             printf(")");
 271             break;
 272         default:
 273             if (len - i < IP6OPT_MINLEN) {
 274                 printf("(type %d: trunc)", bp[i]);
 275                 goto trunc;
 276             }
 277             printf("(opt_type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
 278             break;
 279         }
 280     }
 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     register const u_char *ep;
 296     int hbhlen = 0;
 297
 298     /* 'ep' points to the end of available data. */
 299     ep = snapend;
 300     TCHECK(dp->ip6h_len);
 301     hbhlen = (int)((dp->ip6h_len + 1) << 3);
 302     TCHECK2(*dp, hbhlen);
 303     printf("HBH ");
 304     if (vflag)
 305         ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
 306
 307     return(hbhlen);
 308
 309   trunc:
 310     fputs("[|HBH]", stdout);
 311     return(hbhlen);
 312 }
 313
 314 int
 315 dstopt_print(register const u_char *bp)
 316 {
 317     const struct ip6_dest *dp = (struct ip6_dest *)bp;
 318     register const u_char *ep;
 319     int dstoptlen = 0;
 320
 321     /* 'ep' points to the end of available data. */
 322     ep = snapend;
 323     TCHECK(dp->ip6d_len);
 324     dstoptlen = (int)((dp->ip6d_len + 1) << 3);
 325     TCHECK2(*dp, dstoptlen);
 326     printf("DSTOPT ");
 327     if (vflag) {
 328         ip6_opt_print((const u_char *)dp + sizeof(*dp),
 329             dstoptlen - sizeof(*dp));
 330     }
 331
 332     return(dstoptlen);
 333
 334   trunc:
 335     fputs("[|DSTOPT]", stdout);
 336     return(dstoptlen);
 337 }
 338 #endif /* INET6 */