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 1.8 2000-12-13 07:57:05 itojun Exp $";
  37 #endif
  38
  39 #ifdef INET6
  40 #include <sys/param.h>
  41 #include <sys/time.h>
  42 #include <sys/types.h>
  43 #include <sys/socket.h>
  44
  45 #include <netinet/in.h>
  46 #include <stdio.h>
  47
  48 #include "ip6.h"
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52
  53 /* items outside of rfc2292bis */
  54 #ifndef IP6OPT_MINLEN
  55 #define IP6OPT_MINLEN   2
  56 #endif
  57 #ifndef IP6OPT_RTALERT_LEN
  58 #define IP6OPT_RTALERT_LEN      4
  59 #endif
  60 #ifndef IP6OPT_JUMBO_LEN
  61 #define IP6OPT_JUMBO_LEN        6
  62 #endif
  63 #define IP6OPT_HOMEADDR_MINLEN 18
  64 #define IP6OPT_BU_MINLEN       10
  65 #define IP6OPT_BA_MINLEN       13
  66 #define IP6OPT_BR_MINLEN        2
  67 #define IP6SOPT_ALTCOA        0x4
  68 #define IP6SOPT_ALTCOA_MINLEN  18
  69 #define IP6SOPT_UI            0x2
  70 #define IP6SOPT_UI_MINLEN       4
  71
  72 static void ip6_sopt_print(const u_char *, int);
  73
  74 static void
  75 ip6_sopt_print(const u_char *bp, int len)
  76 {
  77     int i;
  78     int optlen;
  79
  80     for (i = 0; i < len; i += optlen) {
  81         switch (bp[i]) {
  82         case IP6OPT_PAD1:
  83             printf(", pad1");
  84             optlen = 1;
  85             break;
  86         case IP6OPT_PADN:
  87             if (len - i < IP6OPT_MINLEN) {
  88                 printf(", padn: trunc");
  89                 goto trunc;
  90             }
  91             printf(", padn");
  92             optlen = bp[i + 1] + 2;
  93             break;
  94         case IP6SOPT_ALTCOA:
  95              if (len - i < IP6SOPT_ALTCOA_MINLEN) {
  96                 printf(", altcoa: trunc");
  97                 goto trunc;
  98             }
  99             printf(", alt-CoA: %s", ip6addr_string(&bp[i+2]));
 100             optlen = bp[i + 1] + 2;
 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) ", ntohs(*(u_int16_t *)&bp[i + 2]));
 108             optlen = bp[i + 1] + 2;
 109             break;
 110         default:
 111             if (len - i < IP6OPT_MINLEN) {
 112                 printf(", sopt_type %d: trunc)", bp[i]);
 113                 goto trunc;
 114             }
 115             printf(", sopt_type 0x%02x: len=%d", bp[i], bp[i + 1]);
 116             optlen = bp[i + 1] + 2;
 117             break;
 118         }
 119     }
 120     return;
 121
 122 trunc:
 123     printf("[trunc] ");
 124 }
 125
 126 void
 127 ip6_opt_print(const u_char *bp, int len)
 128 {
 129     int i;
 130     int optlen;
 131
 132     for (i = 0; i < len; i += optlen) {
 133         switch (bp[i]) {
 134         case IP6OPT_PAD1:
 135             printf("(pad1)");
 136             optlen = 1;
 137             break;
 138         case IP6OPT_PADN:
 139             if (len - i < IP6OPT_MINLEN) {
 140                 printf("(padn: trunc)");
 141                 goto trunc;
 142             }
 143             printf("(padn)");
 144             optlen = bp[i + 1] + 2;
 145             break;
 146         case IP6OPT_ROUTER_ALERT:
 147             if (len - i < IP6OPT_RTALERT_LEN) {
 148                 printf("(rtalert: trunc)");
 149                 goto trunc;
 150             }
 151             if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
 152                 printf("(rtalert: invalid len %d)", bp[i + 1]);
 153                 goto trunc;
 154             }
 155             printf("(rtalert: 0x%04x) ", ntohs(*(u_int16_t *)&bp[i + 2]));
 156             optlen = IP6OPT_RTALERT_LEN;
 157             break;
 158         case IP6OPT_JUMBO:
 159             if (len - i < IP6OPT_JUMBO_LEN) {
 160                 printf("(jumbo: trunc)");
 161                 goto trunc;
 162             }
 163             if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
 164                 printf("(jumbo: invalid len %d)", bp[i + 1]);
 165                 goto trunc;
 166             }
 167             printf("(jumbo: %u) ", (u_int32_t)ntohl(*(u_int32_t *)&bp[i + 2]));
 168             optlen = IP6OPT_JUMBO_LEN;
 169             break;
 170         case IP6OPT_HOME_ADDRESS:
 171             if (len - i < IP6OPT_HOMEADDR_MINLEN) {
 172                 printf("(homeaddr: trunc)");
 173                 goto trunc;
 174             }
 175             if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
 176                 printf("(homeaddr: invalid len %d)", bp[i + 1]);
 177                 goto trunc;
 178             }
 179             printf("(homeaddr: %s", ip6addr_string(&bp[i + 2]));
 180             if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
 181                 ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN],
 182                     (optlen-IP6OPT_HOMEADDR_MINLEN));
 183             }
 184             printf(")");
 185             optlen = bp[i + 1] + 2;
 186             break;
 187         case IP6OPT_BINDING_UPDATE:
 188             if (len - i < IP6OPT_BU_MINLEN) {
 189                 printf("(bu: trunc)");
 190                 goto trunc;
 191             }
 192             if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) {
 193                 printf("(bu: invalid len %d)", bp[i + 1]);
 194                 goto trunc;
 195             }
 196             printf("(bu: ");
 197             if (bp[i + 2] & 0x80)
 198                     printf("A");
 199             if (bp[i + 2] & 0x40)
 200                     printf("H");
 201             if (bp[i + 2] & 0x20)
 202                     printf("R");
 203             if (bp[i + 2] & 0x10)
 204                     printf("D");
 205             if (bp[i + 2] & 0x0f)
 206                     printf("res");
 207             printf(", prefixlen: %u", bp[i + 3]);
 208             printf(", sequence: %u",
 209                 (u_int16_t)ntohs(*(u_int16_t *)&bp[i + 4]));
 210             printf(", lifetime: %u",
 211                 (u_int32_t)ntohs(*(u_int32_t *)&bp[i + 8]));
 212
 213             optlen = bp[i + 1] + 2;
 214             if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) {
 215                 ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN],
 216                     (optlen - IP6OPT_BU_MINLEN));
 217             }
 218             printf(")");
 219             break;
 220         case IP6OPT_BINDING_ACK:
 221             if (len - i < IP6OPT_BA_MINLEN) {
 222                 printf("(ba: trunc)");
 223                 goto trunc;
 224             }
 225             if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) {
 226                 printf("(ba: invalid len %d)", bp[i + 1]);
 227                 goto trunc;
 228             }
 229             printf("(ba: ");
 230             printf("status: %u", bp[i + 2]);
 231             printf(", sequence: %u",
 232                 (u_int16_t)ntohs(*(u_int16_t *)&bp[i + 3]));
 233             printf(", lifetime: %u",
 234                 (u_int32_t)ntohs(*(u_int32_t *)&bp[i + 7]));
 235             printf(", refresh: %u",
 236                 (u_int32_t)ntohs(*(u_int32_t *)&bp[i + 11]));
 237
 238             if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) {
 239                 ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN],
 240                     (optlen-IP6OPT_BA_MINLEN));
 241             }
 242             printf(")");
 243             optlen = bp[i + 1] + 2;
 244             break;
 245         case IP6OPT_BINDING_REQ:
 246             if (len - i < IP6OPT_BR_MINLEN) {
 247                 printf("(br: trunc)");
 248                 goto trunc;
 249             }
 250             printf("(br");
 251             if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) {
 252                 ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN],
 253                     (optlen-IP6OPT_BR_MINLEN));
 254             }
 255             printf(")");
 256             optlen = bp[i + 1] + 2;
 257             break;
 258         default:
 259             if (len - i < IP6OPT_MINLEN) {
 260                 printf("(type %d: trunc)", bp[i]);
 261                 goto trunc;
 262             }
 263             printf("(opt_type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
 264             optlen = bp[i + 1] + 2;
 265             break;
 266         }
 267     }
 268
 269 #if 0
 270 end:
 271 #endif
 272     return;
 273
 274 trunc:
 275     printf("[trunc] ");
 276 }
 277
 278 int
 279 hbhopt_print(register const u_char *bp)
 280 {
 281     const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
 282     register const u_char *ep;
 283     int hbhlen = 0;
 284
 285     /* 'ep' points to the end of available data. */
 286     ep = snapend;
 287     TCHECK(dp->ip6h_len);
 288     hbhlen = (int)((dp->ip6h_len + 1) << 3);
 289     TCHECK2(*dp, hbhlen);
 290     printf("HBH ");
 291     if (vflag)
 292         ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
 293
 294     return(hbhlen);
 295
 296   trunc:
 297     fputs("[|HBH]", stdout);
 298     return(hbhlen);
 299 }
 300
 301 int
 302 dstopt_print(register const u_char *bp)
 303 {
 304     const struct ip6_dest *dp = (struct ip6_dest *)bp;
 305     register const u_char *ep;
 306     int dstoptlen = 0;
 307
 308     /* 'ep' points to the end of available data. */
 309     ep = snapend;
 310     TCHECK(dp->ip6d_len);
 311     dstoptlen = (int)((dp->ip6d_len + 1) << 3);
 312     TCHECK2(*dp, dstoptlen);
 313     printf("DSTOPT ");
 314     if (vflag) {
 315         ip6_opt_print((const u_char *)dp + sizeof(*dp),
 316             dstoptlen - sizeof(*dp));
 317     }
 318
 319     return(dstoptlen);
 320
 321   trunc:
 322     fputs("[|DSTOPT]", stdout);
 323     return(dstoptlen);
 324 }
 325 #endif /* INET6 */