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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include "interface.h"
  32 #include "addrtoname.h"
  33 #include "extract.h"            /* must come after interface.h */
  34
  35 #ifndef IN_CLASSD
  36 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
  37 #endif
  38
  39 static const char tstr[] = "[|igmp]";
  40
  41 /* (following from ipmulti/mrouted/prune.h) */
  42
  43 /*
  44  * The packet format for a traceroute request.
  45  */
  46 struct tr_query {
  47     u_int32_t  tr_src;          /* traceroute source */
  48     u_int32_t  tr_dst;          /* traceroute destination */
  49     u_int32_t  tr_raddr;        /* traceroute response address */
  50     u_int32_t  tr_rttlqid;      /* response ttl and qid */
  51 };
  52
  53 #define TR_GETTTL(x)        (int)(((x) >> 24) & 0xff)
  54 #define TR_GETQID(x)        ((x) & 0x00ffffff)
  55
  56 /*
  57  * Traceroute response format.  A traceroute response has a tr_query at the
  58  * beginning, followed by one tr_resp for each hop taken.
  59  */
  60 struct tr_resp {
  61     u_int32_t tr_qarr;          /* query arrival time */
  62     u_int32_t tr_inaddr;        /* incoming interface address */
  63     u_int32_t tr_outaddr;       /* outgoing interface address */
  64     u_int32_t tr_rmtaddr;       /* parent address in source tree */
  65     u_int32_t tr_vifin;         /* input packet count on interface */
  66     u_int32_t tr_vifout;        /* output packet count on interface */
  67     u_int32_t tr_pktcnt;        /* total incoming packets for src-grp */
  68     u_int8_t  tr_rproto;      /* routing proto deployed on router */
  69     u_int8_t  tr_fttl;        /* ttl required to forward on outvif */
  70     u_int8_t  tr_smask;       /* subnet mask for src addr */
  71     u_int8_t  tr_rflags;      /* forwarding error codes */
  72 };
  73
  74 /* defs within mtrace */
  75 #define TR_QUERY 1
  76 #define TR_RESP 2
  77
  78 /* fields for tr_rflags (forwarding error codes) */
  79 #define TR_NO_ERR   0
  80 #define TR_WRONG_IF 1
  81 #define TR_PRUNED   2
  82 #define TR_OPRUNED  3
  83 #define TR_SCOPED   4
  84 #define TR_NO_RTE   5
  85 #define TR_NO_FWD   7
  86 #define TR_NO_SPACE 0x81
  87 #define TR_OLD_ROUTER   0x82
  88
  89 /* fields for tr_rproto (routing protocol) */
  90 #define TR_PROTO_DVMRP  1
  91 #define TR_PROTO_MOSPF  2
  92 #define TR_PROTO_PIM    3
  93 #define TR_PROTO_CBT    4
  94
  95 /* igmpv3 report types */
  96 static const struct tok igmpv3report2str[] = {
  97         { 1,    "is_in" },
  98         { 2,    "is_ex" },
  99         { 3,    "to_in" },
 100         { 4,    "to_ex" },
 101         { 5,    "allow" },
 102         { 6,    "block" },
 103         { 0,    NULL }
 104 };
 105
 106 static void
 107 print_mtrace(register const u_char *bp, register u_int len)
 108 {
 109     register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
 110
 111     TCHECK(*tr);
 112     if (len < 8 + sizeof (struct tr_query)) {
 113         (void)printf(" [invalid len %d]", len);
 114         return;
 115     }
 116     printf("mtrace %u: %s to %s reply-to %s",
 117         TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
 118         ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
 119         ipaddr_string(&tr->tr_raddr));
 120     if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
 121         printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)));
 122     return;
 123 trunc:
 124     printf("%s", tstr);
 125     return;
 126 }
 127
 128 static void
 129 print_mresp(register const u_char *bp, register u_int len)
 130 {
 131     register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
 132
 133     TCHECK(*tr);
 134     if (len < 8 + sizeof (struct tr_query)) {
 135         (void)printf(" [invalid len %d]", len);
 136         return;
 137     }
 138     printf("mresp %lu: %s to %s reply-to %s",
 139         (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
 140         ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
 141         ipaddr_string(&tr->tr_raddr));
 142     if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
 143         printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)));
 144     return;
 145 trunc:
 146     printf("%s", tstr);
 147     return;
 148 }
 149
 150 static void
 151 print_igmpv3_report(register const u_char *bp, register u_int len)
 152 {
 153     u_int group, nsrcs, ngroups;
 154     register u_int i, j;
 155
 156     /* Minimum len is 16, and should be a multiple of 4 */
 157     if (len < 16 || len & 0x03) {
 158         (void)printf(" [invalid len %d]", len);
 159         return;
 160     }
 161     TCHECK2(bp[6], 2);
 162     ngroups = EXTRACT_16BITS(&bp[6]);
 163     (void)printf(", %d group record(s)", ngroups);
 164     if (vflag > 0) {
 165         /* Print the group records */
 166         group = 8;
 167         for (i=0; i<ngroups; i++) {
 168             if (len < group+8) {
 169                 (void)printf(" [invalid number of groups]");
 170                 return;
 171             }
 172             TCHECK2(bp[group+4], 4);
 173             (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4]));
 174             (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]",
 175                                                                 bp[group]));
 176             nsrcs = EXTRACT_16BITS(&bp[group+2]);
 177             /* Check the number of sources and print them */
 178             if (len < group+8+(nsrcs<<2)) {
 179                 (void)printf(" [invalid number of sources %d]", nsrcs);
 180                 return;
 181             }
 182             if (vflag == 1)
 183                 (void)printf(", %d source(s)", nsrcs);
 184             else {
 185                 /* Print the sources */
 186                 (void)printf(" {");
 187                 for (j=0; j<nsrcs; j++) {
 188                     TCHECK2(bp[group+8+(j<<2)], 4);
 189                     (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)]));
 190                 }
 191                 (void)printf(" }");
 192             }
 193             /* Next group record */
 194             group += 8 + (nsrcs << 2);
 195             (void)printf("]");
 196         }
 197     }
 198     return;
 199 trunc:
 200     (void)printf("%s", tstr);
 201     return;
 202 }
 203
 204 static void
 205 print_igmpv3_query(register const u_char *bp, register u_int len)
 206 {
 207     u_int mrc;
 208     int mrt;
 209     u_int nsrcs;
 210     register u_int i;
 211
 212     (void)printf(" v3");
 213     /* Minimum len is 12, and should be a multiple of 4 */
 214     if (len < 12 || len & 0x03) {
 215         (void)printf(" [invalid len %d]", len);
 216         return;
 217     }
 218     TCHECK(bp[1]);
 219     mrc = bp[1];
 220     if (mrc < 128) {
 221         mrt = mrc;
 222     } else {
 223         mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3);
 224     }
 225     if (mrc != 100) {
 226         (void)printf(" [max resp time ");
 227         if (mrt < 600) {
 228             (void)printf("%.1fs", mrt * 0.1);
 229         } else {
 230             relts_print(mrt / 10);
 231         }
 232         (void)printf("]");
 233     }
 234     TCHECK2(bp[4], 4);
 235     if (EXTRACT_32BITS(&bp[4]) == 0)
 236         return;
 237     (void)printf(" [gaddr %s", ipaddr_string(&bp[4]));
 238     TCHECK2(bp[10], 2);
 239     nsrcs = EXTRACT_16BITS(&bp[10]);
 240     if (nsrcs > 0) {
 241         if (len < 12 + (nsrcs << 2))
 242             (void)printf(" [invalid number of sources]");
 243         else if (vflag > 1) {
 244             (void)printf(" {");
 245             for (i=0; i<nsrcs; i++) {
 246                 TCHECK2(bp[12+(i<<2)], 4);
 247                 (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)]));
 248             }
 249             (void)printf(" }");
 250         } else
 251             (void)printf(", %d source(s)", nsrcs);
 252     }
 253     (void)printf("]");
 254     return;
 255 trunc:
 256     (void)printf("%s", tstr);
 257     return;
 258 }
 259
 260 void
 261 igmp_print(register const u_char *bp, register u_int len)
 262 {
 263     struct cksum_vec vec[1];
 264
 265     if (qflag) {
 266         (void)printf("igmp");
 267         return;
 268     }
 269
 270     TCHECK(bp[0]);
 271     switch (bp[0]) {
 272     case 0x11:
 273         (void)printf("igmp query");
 274         if (len >= 12)
 275             print_igmpv3_query(bp, len);
 276         else {
 277             TCHECK(bp[1]);
 278             if (bp[1]) {
 279                 (void)printf(" v2");
 280                 if (bp[1] != 100)
 281                     (void)printf(" [max resp time %d]", bp[1]);
 282             } else
 283                 (void)printf(" v1");
 284             TCHECK2(bp[4], 4);
 285             if (EXTRACT_32BITS(&bp[4]))
 286                 (void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
 287             if (len != 8)
 288                 (void)printf(" [len %d]", len);
 289         }
 290         break;
 291     case 0x12:
 292         TCHECK2(bp[4], 4);
 293         (void)printf("igmp v1 report %s", ipaddr_string(&bp[4]));
 294         if (len != 8)
 295             (void)printf(" [len %d]", len);
 296         break;
 297     case 0x16:
 298         TCHECK2(bp[4], 4);
 299         (void)printf("igmp v2 report %s", ipaddr_string(&bp[4]));
 300         break;
 301     case 0x22:
 302         (void)printf("igmp v3 report");
 303         print_igmpv3_report(bp, len);
 304         break;
 305     case 0x17:
 306         TCHECK2(bp[4], 4);
 307         (void)printf("igmp leave %s", ipaddr_string(&bp[4]));
 308         break;
 309     case 0x13:
 310         (void)printf("igmp dvmrp");
 311         if (len < 8)
 312             (void)printf(" [len %d]", len);
 313         else
 314             dvmrp_print(bp, len);
 315         break;
 316     case 0x14:
 317         (void)printf("igmp pimv1");
 318         pimv1_print(bp, len);
 319         break;
 320     case 0x1e:
 321         print_mresp(bp, len);
 322         break;
 323     case 0x1f:
 324         print_mtrace(bp, len);
 325         break;
 326     default:
 327         (void)printf("igmp-%d", bp[0]);
 328         break;
 329     }
 330
 331     if (vflag && TTEST2(bp[0], len)) {
 332         /* Check the IGMP checksum */
 333         vec[0].ptr = bp;
 334         vec[0].len = len;
 335         if (in_cksum(vec, 1))
 336             printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
 337     }
 338     return;
 339 trunc:
 340     (void)printf("%s", tstr);
 341 }