The Tcpdump Group git mirrors - tcpdump/blob - print-igmp.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[] _U_ =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-igmp.c,v 1.13 2003-11-16 09:36:23 guy Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <stdio.h>
  34 #include <string.h>
  35
  36 #include "interface.h"
  37 #include "addrtoname.h"
  38 #include "extract.h"            /* must come after interface.h */
  39
  40 #ifndef IN_CLASSD
  41 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
  42 #endif
  43
  44 /* (following from ipmulti/mrouted/prune.h) */
  45
  46 /*
  47  * The packet format for a traceroute request.
  48  */
  49 struct tr_query {
  50     u_int32_t  tr_src;          /* traceroute source */
  51     u_int32_t  tr_dst;          /* traceroute destination */
  52     u_int32_t  tr_raddr;        /* traceroute response address */
  53     u_int32_t  tr_rttlqid;      /* response ttl and qid */
  54 };
  55
  56 #define TR_GETTTL(x)        (int)(((x) >> 24) & 0xff)
  57 #define TR_GETQID(x)        ((x) & 0x00ffffff)
  58
  59 /*
  60  * Traceroute response format.  A traceroute response has a tr_query at the
  61  * beginning, followed by one tr_resp for each hop taken.
  62  */
  63 struct tr_resp {
  64     u_int32_t tr_qarr;          /* query arrival time */
  65     u_int32_t tr_inaddr;        /* incoming interface address */
  66     u_int32_t tr_outaddr;       /* outgoing interface address */
  67     u_int32_t tr_rmtaddr;       /* parent address in source tree */
  68     u_int32_t tr_vifin;         /* input packet count on interface */
  69     u_int32_t tr_vifout;        /* output packet count on interface */
  70     u_int32_t tr_pktcnt;        /* total incoming packets for src-grp */
  71     u_int8_t  tr_rproto;      /* routing proto deployed on router */
  72     u_int8_t  tr_fttl;        /* ttl required to forward on outvif */
  73     u_int8_t  tr_smask;       /* subnet mask for src addr */
  74     u_int8_t  tr_rflags;      /* forwarding error codes */
  75 };
  76
  77 /* defs within mtrace */
  78 #define TR_QUERY 1
  79 #define TR_RESP 2
  80
  81 /* fields for tr_rflags (forwarding error codes) */
  82 #define TR_NO_ERR   0
  83 #define TR_WRONG_IF 1
  84 #define TR_PRUNED   2
  85 #define TR_OPRUNED  3
  86 #define TR_SCOPED   4
  87 #define TR_NO_RTE   5
  88 #define TR_NO_FWD   7
  89 #define TR_NO_SPACE 0x81
  90 #define TR_OLD_ROUTER   0x82
  91
  92 /* fields for tr_rproto (routing protocol) */
  93 #define TR_PROTO_DVMRP  1
  94 #define TR_PROTO_MOSPF  2
  95 #define TR_PROTO_PIM    3
  96 #define TR_PROTO_CBT    4
  97
  98 /* igmpv3 report types */
  99 static struct tok igmpv3report2str[] = {
 100         { 1,    "is_in" },
 101         { 2,    "is_ex" },
 102         { 3,    "to_in" },
 103         { 4,    "to_ex" },
 104         { 5,    "allow" },
 105         { 6,    "block" },
 106         { 0,    NULL }
 107 };
 108
 109 static void
 110 print_mtrace(register const u_char *bp, register u_int len)
 111 {
 112     register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
 113
 114     TCHECK(*tr);
 115     if (len < 8 + sizeof (struct tr_query)) {
 116         (void)printf(" [invalid len %d]", len);
 117         return;
 118     }
 119     printf("mtrace %u: %s to %s reply-to %s",
 120         TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
 121         ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
 122         ipaddr_string(&tr->tr_raddr));
 123     if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
 124         printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)));
 125     return;
 126 trunc:
 127     (void)printf("[|igmp]");
 128     return;
 129 }
 130
 131 static void
 132 print_mresp(register const u_char *bp, register u_int len)
 133 {
 134     register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
 135
 136     TCHECK(*tr);
 137     if (len < 8 + sizeof (struct tr_query)) {
 138         (void)printf(" [invalid len %d]", len);
 139         return;
 140     }
 141     printf("mresp %lu: %s to %s reply-to %s",
 142         (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
 143         ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
 144         ipaddr_string(&tr->tr_raddr));
 145     if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
 146         printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)));
 147     return;
 148 trunc:
 149     (void)printf("[|igmp]");
 150     return;
 151 }
 152
 153 static void
 154 print_igmpv3_report(register const u_char *bp, register u_int len)
 155 {
 156     u_int group, nsrcs, ngroups;
 157     register u_int i, j;
 158
 159     /* Minimum len is 16, and should be a multiple of 4 */
 160     if (len < 16 || len & 0x03) {
 161         (void)printf(" [invalid len %d]", len);
 162         return;
 163     }
 164     TCHECK2(bp[6], 2);
 165     ngroups = EXTRACT_16BITS(&bp[6]);
 166     (void)printf(", %d group record(s)", ngroups);
 167     if (vflag > 0) {
 168         /* Print the group records */
 169         group = 8;
 170         for (i=0; i<ngroups; i++) {
 171             if (len < group+8) {
 172                 (void)printf(" [invalid number of groups]");
 173                 return;
 174             }
 175             TCHECK2(bp[group+4], 4);
 176             (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4]));
 177             (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]",
 178                                                                 bp[group]));
 179             nsrcs = EXTRACT_16BITS(&bp[group+2]);
 180             /* Check the number of sources and print them */
 181             if (len < group+8+(nsrcs<<2)) {
 182                 (void)printf(" [invalid number of sources %d]", nsrcs);
 183                 return;
 184             }
 185             if (vflag == 1)
 186                 (void)printf(", %d source(s)", nsrcs);
 187             else {
 188                 /* Print the sources */
 189                 (void)printf(" {");
 190                 for (j=0; j<nsrcs; j++) {
 191                     TCHECK2(bp[group+8+(j<<2)], 4);
 192                     (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)]));
 193                 }
 194                 (void)printf(" }");
 195             }
 196             /* Next group record */
 197             group += 8 + (nsrcs << 2);
 198             (void)printf("]");
 199         }
 200     }
 201     return;
 202 trunc:
 203     (void)printf("[|igmp]");
 204     return;
 205 }
 206
 207 static void
 208 print_igmpv3_query(register const u_char *bp, register u_int len)
 209 {
 210     u_int mrc;
 211     int mrt;
 212     u_int nsrcs;
 213     register u_int i;
 214
 215     (void)printf(" v3");
 216     /* Minimum len is 12, and should be a multiple of 4 */
 217     if (len < 12 || len & 0x03) {
 218         (void)printf(" [invalid len %d]", len);
 219         return;
 220     }
 221     mrc = bp[1];
 222     if (mrc < 128) {
 223         mrt = mrc;
 224     } else {
 225         mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3);
 226     }
 227     if (mrc != 100) {
 228         (void)printf(" [max resp time ");
 229         relts_print(mrt);
 230         (void)printf("]");
 231     }
 232     TCHECK2(bp[4], 4);
 233     if (EXTRACT_32BITS(&bp[4]) == 0)
 234         return;
 235     (void)printf(" [gaddr %s", ipaddr_string(&bp[4]));
 236     TCHECK2(bp[10], 2);
 237     nsrcs = EXTRACT_16BITS(&bp[10]);
 238     if (nsrcs > 0) {
 239         if (len < 12 + (nsrcs << 2))
 240             (void)printf(" [invalid number of sources]");
 241         else if (vflag > 1) {
 242             (void)printf(" {");
 243             for (i=0; i<nsrcs; i++) {
 244                 TCHECK2(bp[12+(i<<2)], 4);
 245                 (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)]));
 246             }
 247             (void)printf(" }");
 248         } else
 249             (void)printf(", %d source(s)", nsrcs);
 250     }
 251     (void)printf("]");
 252     return;
 253 trunc:
 254     (void)printf("[|igmp]");
 255     return;
 256 }
 257
 258 void
 259 igmp_print(register const u_char *bp, register u_int len)
 260 {
 261     if (qflag) {
 262         (void)printf("igmp");
 263         return;
 264     }
 265
 266     TCHECK2(bp[0], 8);
 267     switch (bp[0]) {
 268     case 0x11:
 269         (void)printf("igmp query");
 270         if (len >= 12)
 271             print_igmpv3_query(bp, len);
 272         else {
 273             if (bp[1]) {
 274                 (void)printf(" v2");
 275                 if (bp[1] != 100)
 276                     (void)printf(" [max resp time %d]", bp[1]);
 277             } else
 278                 (void)printf(" v1");
 279             if (EXTRACT_32BITS(&bp[4]))
 280                 (void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
 281             if (len != 8)
 282                 (void)printf(" [len %d]", len);
 283         }
 284         break;
 285     case 0x12:
 286         (void)printf("igmp v1 report %s", ipaddr_string(&bp[4]));
 287         if (len != 8)
 288             (void)printf(" [len %d]", len);
 289         break;
 290     case 0x16:
 291         (void)printf("igmp v2 report %s", ipaddr_string(&bp[4]));
 292         break;
 293     case 0x22:
 294         (void)printf("igmp v3 report");
 295         print_igmpv3_report(bp, len);
 296         break;
 297     case 0x17:
 298         (void)printf("igmp leave %s", ipaddr_string(&bp[4]));
 299         break;
 300     case 0x13:
 301         (void)printf("igmp dvmrp");
 302         if (len < 8)
 303             (void)printf(" [len %d]", len);
 304         else
 305             dvmrp_print(bp, len);
 306         break;
 307     case 0x14:
 308         (void)printf("igmp pimv1");
 309         pimv1_print(bp, len);
 310         break;
 311     case 0x1e:
 312         print_mresp(bp, len);
 313         break;
 314     case 0x1f:
 315         print_mtrace(bp, len);
 316         break;
 317     default:
 318         (void)printf("igmp-%d", bp[0]);
 319         break;
 320     }
 321
 322     if (vflag && TTEST2(bp[0], len)) {
 323         /* Check the IGMP checksum */
 324         if (in_cksum((const u_short*)bp, len, 0))
 325             printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
 326     }
 327     return;
 328 trunc:
 329     fputs("[|igmp]", stdout);
 330 }