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Diffstat (limited to '')
| -rw-r--r-- | print-igmp.c | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/print-igmp.c b/print-igmp.c new file mode 100644 index 0000000..914e3d6 --- /dev/null +++ b/print-igmp.c @@ -0,0 +1,301 @@ +/* + * 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. + */ + +/* \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 + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#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 } +}; + +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)); + } +} |