diff options
Diffstat (limited to 'print-igmp.c')
| -rw-r--r-- | print-igmp.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/print-igmp.c b/print-igmp.c new file mode 100644 index 0000000..4087ee0 --- /dev/null +++ b/print-igmp.c @@ -0,0 +1,344 @@ +/* + * 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); +} |