/*
* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
*  The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-igmp.c,v 1.10 2024/09/02 16:15:31 christos Exp $");
#endif

/* \summary: Internet Group Management Protocol (IGMP) printer */

/*
* specification:
*
*      RFC 2236 for IGMPv2
*      RFC 3376 for IGMPv3
*      draft-asaeda-mboned-mtrace-v2 for the mtrace message
*/

#include <config.h>

#include "netdissect-stdinc.h"

#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"

#ifndef IN_CLASSD
#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
#endif


/* (following from ipmulti/mrouted/prune.h) */

/*
* The packet format for a traceroute request.
*/
struct tr_query {
   nd_uint32_t  tr_src;        /* traceroute source */
   nd_uint32_t  tr_dst;        /* traceroute destination */
   nd_uint32_t  tr_raddr;      /* traceroute response address */
   nd_uint8_t   tr_rttl;       /* response ttl */
   nd_uint24_t  tr_qid;        /* qid */
};

/*
* Traceroute response format.  A traceroute response has a tr_query at the
* beginning, followed by one tr_resp for each hop taken.
*/
struct tr_resp {
   nd_uint32_t tr_qarr;        /* query arrival time */
   nd_uint32_t tr_inaddr;      /* incoming interface address */
   nd_uint32_t tr_outaddr;     /* outgoing interface address */
   nd_uint32_t tr_rmtaddr;     /* parent address in source tree */
   nd_uint32_t tr_vifin;       /* input packet count on interface */
   nd_uint32_t tr_vifout;      /* output packet count on interface */
   nd_uint32_t tr_pktcnt;      /* total incoming packets for src-grp */
   nd_uint8_t  tr_rproto;      /* routing proto deployed on router */
   nd_uint8_t  tr_fttl;        /* ttl required to forward on outvif */
   nd_uint8_t  tr_smask;       /* subnet mask for src addr */
   nd_uint8_t  tr_rflags;      /* forwarding error codes */
};

/* defs within mtrace */
#define TR_QUERY 1
#define TR_RESP 2

/* fields for tr_rflags (forwarding error codes) */
#define TR_NO_ERR   0
#define TR_WRONG_IF 1
#define TR_PRUNED   2
#define TR_OPRUNED  3
#define TR_SCOPED   4
#define TR_NO_RTE   5
#define TR_NO_FWD   7
#define TR_NO_SPACE 0x81
#define TR_OLD_ROUTER   0x82

/* fields for tr_rproto (routing protocol) */
#define TR_PROTO_DVMRP  1
#define TR_PROTO_MOSPF  2
#define TR_PROTO_PIM    3
#define TR_PROTO_CBT    4

/* igmpv3 report types */
static const struct tok igmpv3report2str[] = {
       { 1,    "is_in" },
       { 2,    "is_ex" },
       { 3,    "to_in" },
       { 4,    "to_ex" },
       { 5,    "allow" },
       { 6,    "block" },
       { 0,    NULL }
};

UNALIGNED_OK
static void
print_mtrace(netdissect_options *ndo,
            const char *typename,
            const u_char *bp, u_int len)
{
   const struct tr_query *tr = (const struct tr_query *)(bp + 8);

   if (len < 8 + sizeof (struct tr_query)) {
       ND_PRINT(" [invalid len %u]", len);
       return;
   }
   ND_PRINT("%s %u: %s to %s reply-to %s",
       typename,
       GET_BE_U_3(tr->tr_qid),
       GET_IPADDR_STRING(tr->tr_src), GET_IPADDR_STRING(tr->tr_dst),
       GET_IPADDR_STRING(tr->tr_raddr));
   if (IN_CLASSD(GET_BE_U_4(tr->tr_raddr)))
       ND_PRINT(" with-ttl %u", GET_U_1(tr->tr_rttl));
}

static void
print_igmpv3_report(netdissect_options *ndo,
                   const u_char *bp, u_int len)
{
   u_int group, nsrcs, ngroups;
   u_int i, j;

   /* Minimum len is 16, and should be a multiple of 4 */
   if (len < 16 || len & 0x03) {
       ND_PRINT(" [invalid len %u]", len);
       return;
   }
   ngroups = GET_BE_U_2(bp + 6);
   ND_PRINT(", %u group record(s)", ngroups);
   if (ndo->ndo_vflag > 0) {
       /* Print the group records */
       group = 8;
       for (i=0; i<ngroups; i++) {
           if (len < group+8) {
               ND_PRINT(" [invalid number of groups]");
               return;
           }
           ND_PRINT(" [gaddr %s", GET_IPADDR_STRING(bp + group + 4));
           ND_PRINT(" %s", tok2str(igmpv3report2str, " [v3-report-#%u]",
                                                               GET_U_1(bp + group)));
           nsrcs = GET_BE_U_2(bp + group + 2);
           /* Check the number of sources and print them */
           if (len < group+8+(nsrcs<<2)) {
               ND_PRINT(" [invalid number of sources %u]", nsrcs);
               return;
           }
           if (ndo->ndo_vflag == 1)
               ND_PRINT(", %u source(s)", nsrcs);
           else {
               /* Print the sources */
               ND_PRINT(" {");
               for (j=0; j<nsrcs; j++) {
                   ND_PRINT(" %s", GET_IPADDR_STRING(bp + group + 8 + (j << 2)));
               }
               ND_PRINT(" }");
           }
           /* Next group record */
           group += 8 + (nsrcs << 2);
           ND_PRINT("]");
       }
   }
}

static void
print_igmpv3_query(netdissect_options *ndo,
                  const u_char *bp, u_int len)
{
   u_int mrc;
   u_int mrt;
   u_int nsrcs;
   u_int i;

   ND_PRINT(" v3");
   /* Minimum len is 12, and should be a multiple of 4 */
   if (len < 12 || len & 0x03) {
       ND_PRINT(" [invalid len %u]", len);
       return;
   }
   mrc = GET_U_1(bp + 1);
   if (mrc < 128) {
       mrt = mrc;
   } else {
       mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3);
   }
   if (mrc != 100) {
       ND_PRINT(" [max resp time ");
       if (mrt < 600) {
           ND_PRINT("%.1fs", mrt * 0.1);
       } else {
           unsigned_relts_print(ndo, mrt / 10);
       }
       ND_PRINT("]");
   }
   if (GET_BE_U_4(bp + 4) == 0)
       return;
   ND_PRINT(" [gaddr %s", GET_IPADDR_STRING(bp + 4));
   nsrcs = GET_BE_U_2(bp + 10);
   if (nsrcs > 0) {
       if (len < 12 + (nsrcs << 2))
           ND_PRINT(" [invalid number of sources]");
       else if (ndo->ndo_vflag > 1) {
           ND_PRINT(" {");
           for (i=0; i<nsrcs; i++) {
               ND_PRINT(" %s", GET_IPADDR_STRING(bp + 12 + (i << 2)));
           }
           ND_PRINT(" }");
       } else
           ND_PRINT(", %u source(s)", nsrcs);
   }
   ND_PRINT("]");
}

void
igmp_print(netdissect_options *ndo,
          const u_char *bp, u_int len)
{
   struct cksum_vec vec[1];

   ndo->ndo_protocol = "igmp";
   if (ndo->ndo_qflag) {
       ND_PRINT("igmp");
       return;
   }

   switch (GET_U_1(bp)) {
   case 0x11:
       ND_PRINT("igmp query");
       if (len >= 12)
           print_igmpv3_query(ndo, bp, len);
       else {
           if (GET_U_1(bp + 1)) {
               ND_PRINT(" v2");
               if (GET_U_1(bp + 1) != 100)
                   ND_PRINT(" [max resp time %u]", GET_U_1(bp + 1));
           } else
               ND_PRINT(" v1");
           if (GET_BE_U_4(bp + 4))
               ND_PRINT(" [gaddr %s]", GET_IPADDR_STRING(bp + 4));
           if (len != 8)
               ND_PRINT(" [len %u]", len);
       }
       break;
   case 0x12:
       ND_PRINT("igmp v1 report %s", GET_IPADDR_STRING(bp + 4));
       if (len != 8)
           ND_PRINT(" [len %u]", len);
       break;
   case 0x16:
       ND_PRINT("igmp v2 report %s", GET_IPADDR_STRING(bp + 4));
       break;
   case 0x22:
       ND_PRINT("igmp v3 report");
       print_igmpv3_report(ndo, bp, len);
       break;
   case 0x17:
       ND_PRINT("igmp leave %s", GET_IPADDR_STRING(bp + 4));
       break;
   case 0x13:
       ND_PRINT("igmp dvmrp");
       if (len < 8)
           ND_PRINT(" [len %u]", len);
       else
           dvmrp_print(ndo, bp, len);
       break;
   case 0x14:
       ND_PRINT("igmp pimv1");
       pimv1_print(ndo, bp, len);
       break;
   case 0x1e:
       print_mtrace(ndo, "mresp", bp, len);
       break;
   case 0x1f:
       print_mtrace(ndo, "mtrace", bp, len);
       break;
   default:
       ND_PRINT("igmp-%u", GET_U_1(bp));
       break;
   }

   if (ndo->ndo_vflag && len >= 4 && ND_TTEST_LEN(bp, len)) {
       /* Check the IGMP checksum */
       vec[0].ptr = bp;
       vec[0].len = len;
       if (in_cksum(vec, 1))
           ND_PRINT(" bad igmp cksum %x!", GET_BE_U_2(bp + 2));
   }
}

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