| /* |
| * 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)); |
| } |
| } |