The Tcpdump Group git mirrors - tcpdump/blob - print-icmp.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.42 1999-11-21 09:36:52 fenner Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <sys/param.h>
  32 #include <sys/time.h>
  33 #include <sys/socket.h>
  34
  35 #if __STDC__
  36 struct mbuf;
  37 struct rtentry;
  38 #endif
  39 #include <net/if.h>
  40
  41 #include <netinet/in.h>
  42 #include <netinet/if_ether.h>
  43 #include <netinet/in_systm.h>
  44 #include <netinet/ip.h>
  45 #include <netinet/ip_icmp.h>
  46 #include <netinet/ip_var.h>
  47 #include <netinet/udp.h>
  48 #include <netinet/udp_var.h>
  49 #include <netinet/tcp.h>
  50
  51 #include <stdio.h>
  52 #include <string.h>
  53
  54 #include "interface.h"
  55 #include "addrtoname.h"
  56 #include "extract.h"                    /* must come after interface.h */
  57
  58 /* rfc1700 */
  59 #ifndef ICMP_UNREACH_NET_UNKNOWN
  60 #define ICMP_UNREACH_NET_UNKNOWN        6       /* destination net unknown */
  61 #endif
  62 #ifndef ICMP_UNREACH_HOST_UNKNOWN
  63 #define ICMP_UNREACH_HOST_UNKNOWN       7       /* destination host unknown */
  64 #endif
  65 #ifndef ICMP_UNREACH_ISOLATED
  66 #define ICMP_UNREACH_ISOLATED           8       /* source host isolated */
  67 #endif
  68 #ifndef ICMP_UNREACH_NET_PROHIB
  69 #define ICMP_UNREACH_NET_PROHIB         9       /* admin prohibited net */
  70 #endif
  71 #ifndef ICMP_UNREACH_HOST_PROHIB
  72 #define ICMP_UNREACH_HOST_PROHIB        10      /* admin prohibited host */
  73 #endif
  74 #ifndef ICMP_UNREACH_TOSNET
  75 #define ICMP_UNREACH_TOSNET             11      /* tos prohibited net */
  76 #endif
  77 #ifndef ICMP_UNREACH_TOSHOST
  78 #define ICMP_UNREACH_TOSHOST            12      /* tos prohibited host */
  79 #endif
  80
  81 /* rfc1716 */
  82 #ifndef ICMP_UNREACH_FILTER_PROHIB
  83 #define ICMP_UNREACH_FILTER_PROHIB      13      /* admin prohibited filter */
  84 #endif
  85 #ifndef ICMP_UNREACH_HOST_PRECEDENCE
  86 #define ICMP_UNREACH_HOST_PRECEDENCE    14      /* host precedence violation */
  87 #endif
  88 #ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
  89 #define ICMP_UNREACH_PRECEDENCE_CUTOFF  15      /* precedence cutoff */
  90 #endif
  91
  92 /* rfc1256 */
  93 #ifndef ICMP_ROUTERADVERT
  94 #define ICMP_ROUTERADVERT               9       /* router advertisement */
  95 #endif
  96 #ifndef ICMP_ROUTERSOLICIT
  97 #define ICMP_ROUTERSOLICIT              10      /* router solicitation */
  98 #endif
  99
 100 /* Most of the icmp types */
 101 static struct tok icmp2str[] = {
 102         { ICMP_ECHOREPLY,               "echo reply" },
 103         { ICMP_SOURCEQUENCH,            "source quench" },
 104         { ICMP_ECHO,                    "echo request" },
 105         { ICMP_ROUTERSOLICIT,           "router solicitation" },
 106         { ICMP_TSTAMP,                  "time stamp request" },
 107         { ICMP_TSTAMPREPLY,             "time stamp reply" },
 108         { ICMP_IREQ,                    "information request" },
 109         { ICMP_IREQREPLY,               "information reply" },
 110         { ICMP_MASKREQ,                 "address mask request" },
 111         { 0,                            NULL }
 112 };
 113
 114 /* Formats for most of the ICMP_UNREACH codes */
 115 static struct tok unreach2str[] = {
 116         { ICMP_UNREACH_NET,             "net %s unreachable" },
 117         { ICMP_UNREACH_HOST,            "host %s unreachable" },
 118         { ICMP_UNREACH_SRCFAIL,
 119             "%s unreachable - source route failed" },
 120         { ICMP_UNREACH_NET_UNKNOWN,     "net %s unreachable - unknown" },
 121         { ICMP_UNREACH_HOST_UNKNOWN,    "host %s unreachable - unknown" },
 122         { ICMP_UNREACH_ISOLATED,
 123             "%s unreachable - source host isolated" },
 124         { ICMP_UNREACH_NET_PROHIB,
 125             "net %s unreachable - admin prohibited" },
 126         { ICMP_UNREACH_HOST_PROHIB,
 127             "host %s unreachable - admin prohibited" },
 128         { ICMP_UNREACH_TOSNET,
 129             "net %s unreachable - tos prohibited" },
 130         { ICMP_UNREACH_TOSHOST,
 131             "host %s unreachable - tos prohibited" },
 132         { ICMP_UNREACH_FILTER_PROHIB,
 133             "host %s unreachable - admin prohibited filter" },
 134         { ICMP_UNREACH_HOST_PRECEDENCE,
 135             "host %s unreachable - host precedence violation" },
 136         { ICMP_UNREACH_PRECEDENCE_CUTOFF,
 137             "host %s unreachable - precedence cutoff" },
 138         { 0,                            NULL }
 139 };
 140
 141 /* Formats for the ICMP_REDIRECT codes */
 142 static struct tok type2str[] = {
 143         { ICMP_REDIRECT_NET,            "redirect %s to net %s" },
 144         { ICMP_REDIRECT_HOST,           "redirect %s to host %s" },
 145         { ICMP_REDIRECT_TOSNET,         "redirect-tos %s to net %s" },
 146         { ICMP_REDIRECT_TOSHOST,        "redirect-tos %s to net %s" },
 147         { 0,                            NULL }
 148 };
 149
 150 /* rfc1191 */
 151 struct mtu_discovery {
 152         short unused;
 153         short nexthopmtu;
 154 };
 155
 156 /* rfc1256 */
 157 struct ih_rdiscovery {
 158         u_char ird_addrnum;
 159         u_char ird_addrsiz;
 160         u_short ird_lifetime;
 161 };
 162
 163 struct id_rdiscovery {
 164         u_int32_t ird_addr;
 165         u_int32_t ird_pref;
 166 };
 167
 168 void
 169 icmp_print(register const u_char *bp, u_int plen, register const u_char *bp2)
 170 {
 171         register char *cp;
 172         register const struct icmp *dp;
 173         register const struct ip *ip;
 174         register const char *str, *fmt;
 175         register const struct ip *oip;
 176         register const struct udphdr *ouh;
 177         register u_int hlen, dport, mtu;
 178         char buf[256];
 179
 180         dp = (struct icmp *)bp;
 181         ip = (struct ip *)bp2;
 182         str = buf;
 183
 184 #if 0
 185         (void)printf("%s > %s: ",
 186                 ipaddr_string(&ip->ip_src),
 187                 ipaddr_string(&ip->ip_dst));
 188 #endif
 189
 190         TCHECK(dp->icmp_code);
 191         switch (dp->icmp_type) {
 192
 193         case ICMP_UNREACH:
 194                 TCHECK(dp->icmp_ip.ip_dst);
 195                 switch (dp->icmp_code) {
 196
 197                 case ICMP_UNREACH_PROTOCOL:
 198                         TCHECK(dp->icmp_ip.ip_p);
 199                         (void)sprintf(buf, "%s protocol %d unreachable",
 200                                        ipaddr_string(&dp->icmp_ip.ip_dst),
 201                                        dp->icmp_ip.ip_p);
 202                         break;
 203
 204                 case ICMP_UNREACH_PORT:
 205                         TCHECK(dp->icmp_ip.ip_p);
 206                         oip = &dp->icmp_ip;
 207                         hlen = oip->ip_hl * 4;
 208                         ouh = (struct udphdr *)(((u_char *)oip) + hlen);
 209                         dport = ntohs(ouh->uh_dport);
 210                         switch (oip->ip_p) {
 211
 212                         case IPPROTO_TCP:
 213                                 (void)sprintf(buf,
 214                                         "%s tcp port %s unreachable",
 215                                         ipaddr_string(&oip->ip_dst),
 216                                         tcpport_string(dport));
 217                                 break;
 218
 219                         case IPPROTO_UDP:
 220                                 (void)sprintf(buf,
 221                                         "%s udp port %s unreachable",
 222                                         ipaddr_string(&oip->ip_dst),
 223                                         udpport_string(dport));
 224                                 break;
 225
 226                         default:
 227                                 (void)sprintf(buf,
 228                                         "%s protocol %d port %d unreachable",
 229                                         ipaddr_string(&oip->ip_dst),
 230                                         oip->ip_p, dport);
 231                                 break;
 232                         }
 233                         break;
 234
 235                 case ICMP_UNREACH_NEEDFRAG:
 236                         {
 237                         register const struct mtu_discovery *mp;
 238
 239                         mp = (struct mtu_discovery *)&dp->icmp_void;
 240                         mtu = EXTRACT_16BITS(&mp->nexthopmtu);
 241                         if (mtu)
 242                             (void)sprintf(buf,
 243                                 "%s unreachable - need to frag (mtu %d)",
 244                                 ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
 245                         else
 246                             (void)sprintf(buf,
 247                                 "%s unreachable - need to frag",
 248                                 ipaddr_string(&dp->icmp_ip.ip_dst));
 249                         }
 250                         break;
 251
 252                 default:
 253                         fmt = tok2str(unreach2str, "#%d %%s unreachable",
 254                             dp->icmp_code);
 255                         (void)sprintf(buf, fmt,
 256                             ipaddr_string(&dp->icmp_ip.ip_dst));
 257                         break;
 258                 }
 259                 break;
 260
 261         case ICMP_REDIRECT:
 262                 TCHECK(dp->icmp_ip.ip_dst);
 263                 fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
 264                     dp->icmp_code);
 265                 (void)sprintf(buf, fmt,
 266                     ipaddr_string(&dp->icmp_ip.ip_dst),
 267                     ipaddr_string(&dp->icmp_gwaddr));
 268                 break;
 269
 270         case ICMP_ROUTERADVERT:
 271                 {
 272                 register const struct ih_rdiscovery *ihp;
 273                 register const struct id_rdiscovery *idp;
 274                 u_int lifetime, num, size;
 275
 276                 (void)strcpy(buf, "router advertisement");
 277                 cp = buf + strlen(buf);
 278
 279                 ihp = (struct ih_rdiscovery *)&dp->icmp_void;
 280                 TCHECK(*ihp);
 281                 (void)strcpy(cp, " lifetime ");
 282                 cp = buf + strlen(buf);
 283                 lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
 284                 if (lifetime < 60)
 285                         (void)sprintf(cp, "%u", lifetime);
 286                 else if (lifetime < 60 * 60)
 287                         (void)sprintf(cp, "%u:%02u",
 288                             lifetime / 60, lifetime % 60);
 289                 else
 290                         (void)sprintf(cp, "%u:%02u:%02u",
 291                             lifetime / 3600,
 292                             (lifetime % 3600) / 60,
 293                             lifetime % 60);
 294                 cp = buf + strlen(buf);
 295
 296                 num = ihp->ird_addrnum;
 297                 (void)sprintf(cp, " %d:", num);
 298                 cp = buf + strlen(buf);
 299
 300                 size = ihp->ird_addrsiz;
 301                 if (size != 2) {
 302                         (void)sprintf(cp, " [size %d]", size);
 303                         break;
 304                 }
 305                 idp = (struct id_rdiscovery *)&dp->icmp_data;
 306                 while (num-- > 0) {
 307                         TCHECK(*idp);
 308                         (void)sprintf(cp, " {%s %u}",
 309                             ipaddr_string(&idp->ird_addr),
 310                             EXTRACT_32BITS(&idp->ird_pref));
 311                         cp = buf + strlen(buf);
 312                 }
 313                 }
 314                 break;
 315
 316         case ICMP_TIMXCEED:
 317                 TCHECK(dp->icmp_ip.ip_dst);
 318                 switch (dp->icmp_code) {
 319
 320                 case ICMP_TIMXCEED_INTRANS:
 321                         str = "time exceeded in-transit";
 322                         break;
 323
 324                 case ICMP_TIMXCEED_REASS:
 325                         str = "ip reassembly time exceeded";
 326                         break;
 327
 328                 default:
 329                         (void)sprintf(buf, "time exceeded-#%d", dp->icmp_code);
 330                         break;
 331                 }
 332                 break;
 333
 334         case ICMP_PARAMPROB:
 335                 if (dp->icmp_code)
 336                         (void)sprintf(buf, "parameter problem - code %d",
 337                                         dp->icmp_code);
 338                 else {
 339                         TCHECK(dp->icmp_pptr);
 340                         (void)sprintf(buf, "parameter problem - octet %d",
 341                                         dp->icmp_pptr);
 342                 }
 343                 break;
 344
 345         case ICMP_MASKREPLY:
 346                 TCHECK(dp->icmp_mask);
 347                 (void)sprintf(buf, "address mask is 0x%08x",
 348                     (u_int32_t)ntohl(dp->icmp_mask));
 349                 break;
 350
 351         default:
 352                 str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
 353                 break;
 354         }
 355         (void)printf("icmp: %s", str);
 356         if (vflag) {
 357                 if (((u_char*)bp) + plen <= snapend) {
 358                         if (in_cksum((u_short*)dp, plen, 0))
 359                                 printf(" (wrong icmp csum)");
 360                 }
 361         }
 362         return;
 363 trunc:
 364         fputs("[|icmp]", stdout);
 365 }