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[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-igmp.c,v 1.8 2002-08-01 08:53:09 risso 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_int  tr_src;          /* traceroute source */
  51     u_int  tr_dst;          /* traceroute destination */
  52     u_int  tr_raddr;        /* traceroute response address */
  53     u_int  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_int tr_qarr;          /* query arrival time */
  65     u_int tr_inaddr;        /* incoming interface address */
  66     u_int tr_outaddr;       /* outgoing interface address */
  67     u_int tr_rmtaddr;       /* parent address in source tree */
  68     u_int tr_vifin;         /* input packet count on interface */
  69     u_int tr_vifout;        /* output packet count on interface */
  70     u_int tr_pktcnt;        /* total incoming packets for src-grp */
  71     u_char  tr_rproto;      /* routing proto deployed on router */
  72     u_char  tr_fttl;        /* ttl required to forward on outvif */
  73     u_char  tr_smask;       /* subnet mask for src addr */
  74     u_char  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     printf("mtrace %lu: %s to %s reply-to %s",
 115         (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)),
 116         ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
 117         ipaddr_string(&tr->tr_raddr));
 118     if (IN_CLASSD(ntohl(tr->tr_raddr)))
 119         printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid)));
 120 }
 121
 122 static void
 123 print_mresp(register const u_char *bp, register u_int len)
 124 {
 125     register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
 126
 127     printf("mresp %lu: %s to %s reply-to %s",
 128         (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)),
 129         ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
 130         ipaddr_string(&tr->tr_raddr));
 131     if (IN_CLASSD(ntohl(tr->tr_raddr)))
 132         printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid)));
 133 }
 134
 135 static void
 136 print_igmpv3_report(register const u_char *bp, register u_int len)
 137 {
 138     u_int group, nsrcs, ngroups;
 139     register u_int i, j;
 140
 141     /* Minimum len is 16, and should be a multiple of 4 */
 142     if (len < 16 || len & 0x03) {
 143         (void)printf(" [invalid len %d]", len);
 144         return;
 145     }
 146     TCHECK2(bp[6], 2);
 147     ngroups = EXTRACT_16BITS(&bp[6]);
 148     (void)printf(", %d group record(s)", ngroups);
 149     if (vflag > 0) {
 150         /* Print the group records */
 151         group = 8;
 152         for (i=0; i<ngroups; i++) {
 153             if (len < group+8) {
 154                 (void)printf(" [invalid number of groups]");
 155                 return;
 156             }
 157             TCHECK2(bp[group+4], 4);
 158             (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4]));
 159             (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]",
 160                                                                 bp[group]));
 161             nsrcs = EXTRACT_16BITS(&bp[group+2]);
 162             /* Check the number of sources and print them */
 163             if (len < group+8+(nsrcs<<2)) {
 164                 (void)printf(" [invalid number of sources %d]", nsrcs);
 165                 return;
 166             }
 167             if (vflag == 1)
 168                 (void)printf(", %d source(s)", nsrcs);
 169             else {
 170                 /* Print the sources */
 171                 (void)printf(" {");
 172                 for (j=0; j<nsrcs; j++) {
 173                     TCHECK2(bp[group+8+(j<<2)], 4);
 174                     (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)]));
 175                 }
 176                 (void)printf(" }");
 177             }
 178             /* Next group record */
 179             group += 8 + (nsrcs << 2);
 180             (void)printf("]");
 181         }
 182     }
 183     return;
 184 trunc:
 185     (void)printf("[|igmp]");
 186     return;
 187 }
 188
 189 static void
 190 print_igmpv3_query(register const u_char *bp, register u_int len)
 191 {
 192     u_int mrc;
 193     int mrt;
 194     u_int nsrcs;
 195     register u_int i;
 196
 197     (void)printf(" v3");
 198     /* Minimum len is 12, and should be a multiple of 4 */
 199     if (len < 12 || len & 0x03) {
 200         (void)printf(" [invalid len %d]", len);
 201         return;
 202     }
 203     mrc = bp[1];
 204     if (mrc < 128) {
 205         mrt = mrc;
 206     } else {
 207         mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3);
 208     }
 209     if (mrc != 100) {
 210         (void)printf(" [max resp time ");
 211         relts_print(mrt);
 212         (void)printf("]");
 213     }
 214     TCHECK2(bp[4], 4);
 215     if (EXTRACT_32BITS(&bp[4]) == 0)
 216         return;
 217     (void)printf(" [gaddr %s", ipaddr_string(&bp[4]));
 218     TCHECK2(bp[10], 2);
 219     nsrcs = EXTRACT_16BITS(&bp[10]);
 220     if (nsrcs > 0) {
 221         if (len < 12 + (nsrcs << 2))
 222             (void)printf(" [invalid number of sources]");
 223         else if (vflag > 1) {
 224             (void)printf(" {");
 225             for (i=0; i<nsrcs; i++) {
 226                 TCHECK2(bp[12+(i<<2)], 4);
 227                 (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)]));
 228             }
 229             (void)printf(" }");
 230         } else
 231             (void)printf(", %d source(s)", nsrcs);
 232     }
 233     (void)printf("]");
 234     return;
 235 trunc:
 236     (void)printf("[|igmp]");
 237     return;
 238 }
 239
 240 void
 241 igmp_print(register const u_char *bp, register u_int len)
 242 {
 243     if (qflag) {
 244         (void)printf("igmp");
 245         return;
 246     }
 247
 248     TCHECK2(bp[0], 8);
 249     switch (bp[0]) {
 250     case 0x11:
 251         (void)printf("igmp query");
 252         if (len >= 12)
 253             print_igmpv3_query(bp, len);
 254         else {
 255             if (bp[1]) {
 256                 (void)printf(" v2");
 257                 if (bp[1] != 100)
 258                     (void)printf(" [max resp time %d]", bp[1]);
 259             } else
 260                 (void)printf(" v1");
 261             if (EXTRACT_32BITS(&bp[4]))
 262                 (void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
 263             if (len != 8)
 264                 (void)printf(" [len %d]", len);
 265         }
 266         break;
 267     case 0x12:
 268         (void)printf("igmp v1 report %s", ipaddr_string(&bp[4]));
 269         if (len != 8)
 270             (void)printf(" [len %d]", len);
 271         break;
 272     case 0x16:
 273         (void)printf("igmp v2 report %s", ipaddr_string(&bp[4]));
 274         break;
 275     case 0x22:
 276         (void)printf("igmp v3 report");
 277         print_igmpv3_report(bp, len);
 278         break;
 279     case 0x17:
 280         (void)printf("igmp leave %s", ipaddr_string(&bp[4]));
 281         break;
 282     case 0x13:
 283         (void)printf("igmp dvmrp");
 284         if (len < 8)
 285             (void)printf(" [len %d]", len);
 286         else
 287             dvmrp_print(bp, len);
 288         break;
 289     case 0x14:
 290         (void)printf("igmp pimv1");
 291         pimv1_print(bp, len);
 292         break;
 293     case 0x1e:
 294         print_mresp(bp, len);
 295         break;
 296     case 0x1f:
 297         print_mtrace(bp, len);
 298         break;
 299     default:
 300         (void)printf("igmp-%d", bp[0]);
 301         break;
 302     }
 303
 304     if (vflag && TTEST2(bp[0], len)) {
 305         /* Check the IGMP checksum */
 306         if (in_cksum((const u_short*)bp, len, 0))
 307             printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
 308     }
 309     return;
 310 trunc:
 311     fputs("[|igmp]", stdout);
 312 }