| /* |
| * 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. |
| */ |
| |
| #ifndef lint |
| static const char rcsid[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-igmp.c,v 1.15 2004-03-24 00:59:16 guy Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "interface.h" |
| #include "addrtoname.h" |
| #include "extract.h" /* must come after interface.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 { |
| u_int32_t tr_src; /* traceroute source */ |
| u_int32_t tr_dst; /* traceroute destination */ |
| u_int32_t tr_raddr; /* traceroute response address */ |
| u_int32_t tr_rttlqid; /* response ttl and qid */ |
| }; |
| |
| #define TR_GETTTL(x) (int)(((x) >> 24) & 0xff) |
| #define TR_GETQID(x) ((x) & 0x00ffffff) |
| |
| /* |
| * 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 { |
| u_int32_t tr_qarr; /* query arrival time */ |
| u_int32_t tr_inaddr; /* incoming interface address */ |
| u_int32_t tr_outaddr; /* outgoing interface address */ |
| u_int32_t tr_rmtaddr; /* parent address in source tree */ |
| u_int32_t tr_vifin; /* input packet count on interface */ |
| u_int32_t tr_vifout; /* output packet count on interface */ |
| u_int32_t tr_pktcnt; /* total incoming packets for src-grp */ |
| u_int8_t tr_rproto; /* routing proto deployed on router */ |
| u_int8_t tr_fttl; /* ttl required to forward on outvif */ |
| u_int8_t tr_smask; /* subnet mask for src addr */ |
| u_int8_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 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(register const u_char *bp, register u_int len) |
| { |
| register const struct tr_query *tr = (const struct tr_query *)(bp + 8); |
| |
| TCHECK(*tr); |
| if (len < 8 + sizeof (struct tr_query)) { |
| (void)printf(" [invalid len %d]", len); |
| return; |
| } |
| printf("mtrace %u: %s to %s reply-to %s", |
| TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), |
| ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), |
| ipaddr_string(&tr->tr_raddr)); |
| if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) |
| printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))); |
| return; |
| trunc: |
| (void)printf("[|igmp]"); |
| return; |
| } |
| |
| static void |
| print_mresp(register const u_char *bp, register u_int len) |
| { |
| register const struct tr_query *tr = (const struct tr_query *)(bp + 8); |
| |
| TCHECK(*tr); |
| if (len < 8 + sizeof (struct tr_query)) { |
| (void)printf(" [invalid len %d]", len); |
| return; |
| } |
| printf("mresp %lu: %s to %s reply-to %s", |
| (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), |
| ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), |
| ipaddr_string(&tr->tr_raddr)); |
| if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) |
| printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))); |
| return; |
| trunc: |
| (void)printf("[|igmp]"); |
| return; |
| } |
| |
| static void |
| print_igmpv3_report(register const u_char *bp, register u_int len) |
| { |
| u_int group, nsrcs, ngroups; |
| register u_int i, j; |
| |
| /* Minimum len is 16, and should be a multiple of 4 */ |
| if (len < 16 || len & 0x03) { |
| (void)printf(" [invalid len %d]", len); |
| return; |
| } |
| TCHECK2(bp[6], 2); |
| ngroups = EXTRACT_16BITS(&bp[6]); |
| (void)printf(", %d group record(s)", ngroups); |
| if (vflag > 0) { |
| /* Print the group records */ |
| group = 8; |
| for (i=0; i<ngroups; i++) { |
| if (len < group+8) { |
| (void)printf(" [invalid number of groups]"); |
| return; |
| } |
| TCHECK2(bp[group+4], 4); |
| (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4])); |
| (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]", |
| bp[group])); |
| nsrcs = EXTRACT_16BITS(&bp[group+2]); |
| /* Check the number of sources and print them */ |
| if (len < group+8+(nsrcs<<2)) { |
| (void)printf(" [invalid number of sources %d]", nsrcs); |
| return; |
| } |
| if (vflag == 1) |
| (void)printf(", %d source(s)", nsrcs); |
| else { |
| /* Print the sources */ |
| (void)printf(" {"); |
| for (j=0; j<nsrcs; j++) { |
| TCHECK2(bp[group+8+(j<<2)], 4); |
| (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)])); |
| } |
| (void)printf(" }"); |
| } |
| /* Next group record */ |
| group += 8 + (nsrcs << 2); |
| (void)printf("]"); |
| } |
| } |
| return; |
| trunc: |
| (void)printf("[|igmp]"); |
| return; |
| } |
| |
| static void |
| print_igmpv3_query(register const u_char *bp, register u_int len) |
| { |
| u_int mrc; |
| int mrt; |
| u_int nsrcs; |
| register u_int i; |
| |
| (void)printf(" v3"); |
| /* Minimum len is 12, and should be a multiple of 4 */ |
| if (len < 12 || len & 0x03) { |
| (void)printf(" [invalid len %d]", len); |
| return; |
| } |
| TCHECK(bp[1]); |
| mrc = bp[1]; |
| if (mrc < 128) { |
| mrt = mrc; |
| } else { |
| mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3); |
| } |
| if (mrc != 100) { |
| (void)printf(" [max resp time "); |
| if (mrt < 600) { |
| (void)printf("%.1fs", mrt * 0.1); |
| } else { |
| relts_print(mrt / 10); |
| } |
| (void)printf("]"); |
| } |
| TCHECK2(bp[4], 4); |
| if (EXTRACT_32BITS(&bp[4]) == 0) |
| return; |
| (void)printf(" [gaddr %s", ipaddr_string(&bp[4])); |
| TCHECK2(bp[10], 2); |
| nsrcs = EXTRACT_16BITS(&bp[10]); |
| if (nsrcs > 0) { |
| if (len < 12 + (nsrcs << 2)) |
| (void)printf(" [invalid number of sources]"); |
| else if (vflag > 1) { |
| (void)printf(" {"); |
| for (i=0; i<nsrcs; i++) { |
| TCHECK2(bp[12+(i<<2)], 4); |
| (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)])); |
| } |
| (void)printf(" }"); |
| } else |
| (void)printf(", %d source(s)", nsrcs); |
| } |
| (void)printf("]"); |
| return; |
| trunc: |
| (void)printf("[|igmp]"); |
| return; |
| } |
| |
| void |
| igmp_print(register const u_char *bp, register u_int len) |
| { |
| struct cksum_vec vec[1]; |
| |
| if (qflag) { |
| (void)printf("igmp"); |
| return; |
| } |
| |
| TCHECK(bp[0]); |
| switch (bp[0]) { |
| case 0x11: |
| (void)printf("igmp query"); |
| if (len >= 12) |
| print_igmpv3_query(bp, len); |
| else { |
| TCHECK(bp[1]); |
| if (bp[1]) { |
| (void)printf(" v2"); |
| if (bp[1] != 100) |
| (void)printf(" [max resp time %d]", bp[1]); |
| } else |
| (void)printf(" v1"); |
| TCHECK2(bp[4], 4); |
| if (EXTRACT_32BITS(&bp[4])) |
| (void)printf(" [gaddr %s]", ipaddr_string(&bp[4])); |
| if (len != 8) |
| (void)printf(" [len %d]", len); |
| } |
| break; |
| case 0x12: |
| TCHECK2(bp[4], 4); |
| (void)printf("igmp v1 report %s", ipaddr_string(&bp[4])); |
| if (len != 8) |
| (void)printf(" [len %d]", len); |
| break; |
| case 0x16: |
| TCHECK2(bp[4], 4); |
| (void)printf("igmp v2 report %s", ipaddr_string(&bp[4])); |
| break; |
| case 0x22: |
| (void)printf("igmp v3 report"); |
| print_igmpv3_report(bp, len); |
| break; |
| case 0x17: |
| TCHECK2(bp[4], 4); |
| (void)printf("igmp leave %s", ipaddr_string(&bp[4])); |
| break; |
| case 0x13: |
| (void)printf("igmp dvmrp"); |
| if (len < 8) |
| (void)printf(" [len %d]", len); |
| else |
| dvmrp_print(bp, len); |
| break; |
| case 0x14: |
| (void)printf("igmp pimv1"); |
| pimv1_print(bp, len); |
| break; |
| case 0x1e: |
| print_mresp(bp, len); |
| break; |
| case 0x1f: |
| print_mtrace(bp, len); |
| break; |
| default: |
| (void)printf("igmp-%d", bp[0]); |
| break; |
| } |
| |
| if (vflag && TTEST2(bp[0], len)) { |
| /* Check the IGMP checksum */ |
| vec[0].ptr = bp; |
| vec[0].len = len; |
| if (in_cksum(vec, 1)) |
| printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])); |
| } |
| return; |
| trunc: |
| fputs("[|igmp]", stdout); |
| } |