X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/d07e352f5a8a9cbf7e8f3ed49a316ed906353fd8..10ac80fdecfa9b9b7d259d8f50d0b72ef1b18f12:/print-igmp.c diff --git a/print-igmp.c b/print-igmp.c index 9bc6025c..914e3d6b 100644 --- a/print-igmp.c +++ b/print-igmp.c @@ -21,11 +21,19 @@ /* \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" +#include #endif -#include +#include "netdissect-stdinc.h" #include "netdissect.h" #include "addrtoname.h" @@ -35,7 +43,6 @@ #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000) #endif -static const char tstr[] = "[|igmp]"; /* (following from ipmulti/mrouted/prune.h) */ @@ -43,31 +50,29 @@ static const char tstr[] = "[|igmp]"; * The packet format for a traceroute request. */ struct tr_query { - uint32_t tr_src; /* traceroute source */ - uint32_t tr_dst; /* traceroute destination */ - uint32_t tr_raddr; /* traceroute response address */ - uint32_t tr_rttlqid; /* response ttl and qid */ + 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 */ }; -#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 { - uint32_t tr_qarr; /* query arrival time */ - uint32_t tr_inaddr; /* incoming interface address */ - uint32_t tr_outaddr; /* outgoing interface address */ - uint32_t tr_rmtaddr; /* parent address in source tree */ - uint32_t tr_vifin; /* input packet count on interface */ - uint32_t tr_vifout; /* output packet count on interface */ - uint32_t tr_pktcnt; /* total incoming packets for src-grp */ - uint8_t tr_rproto; /* routing proto deployed on router */ - uint8_t tr_fttl; /* ttl required to forward on outvif */ - uint8_t tr_smask; /* subnet mask for src addr */ - uint8_t tr_rflags; /* forwarding error codes */ + 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 */ @@ -104,238 +109,193 @@ static const struct tok igmpv3report2str[] = { static void print_mtrace(netdissect_options *ndo, - register const u_char *bp, register u_int len) -{ - register const struct tr_query *tr = (const struct tr_query *)(bp + 8); - - ND_TCHECK(*tr); - if (len < 8 + sizeof (struct tr_query)) { - ND_PRINT((ndo, " [invalid len %d]", len)); - return; - } - ND_PRINT((ndo, "mtrace %u: %s to %s reply-to %s", - TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), - ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst), - ipaddr_string(ndo, &tr->tr_raddr))); - if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) - ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)))); - return; -trunc: - ND_PRINT((ndo, "%s", tstr)); -} - -static void -print_mresp(netdissect_options *ndo, - register const u_char *bp, register u_int len) + const char *typename, + const u_char *bp, u_int len) { - register const struct tr_query *tr = (const struct tr_query *)(bp + 8); + const struct tr_query *tr = (const struct tr_query *)(bp + 8); - ND_TCHECK(*tr); if (len < 8 + sizeof (struct tr_query)) { - ND_PRINT((ndo, " [invalid len %d]", len)); + ND_PRINT(" [invalid len %u]", len); return; } - ND_PRINT((ndo, "mresp %lu: %s to %s reply-to %s", - (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), - ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst), - ipaddr_string(ndo, &tr->tr_raddr))); - if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) - ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)))); - return; -trunc: - ND_PRINT((ndo, "%s", tstr)); + 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, - register const u_char *bp, register u_int len) + const u_char *bp, u_int len) { u_int group, nsrcs, ngroups; - register u_int i, j; + u_int i, j; /* Minimum len is 16, and should be a multiple of 4 */ if (len < 16 || len & 0x03) { - ND_PRINT((ndo, " [invalid len %d]", len)); + ND_PRINT(" [invalid len %u]", len); return; } - ND_TCHECK2(bp[6], 2); - ngroups = EXTRACT_16BITS(&bp[6]); - ND_PRINT((ndo, ", %d group record(s)", ngroups)); + 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; indo_vflag == 1) - ND_PRINT((ndo, ", %d source(s)", nsrcs)); + ND_PRINT(", %u source(s)", nsrcs); else { /* Print the sources */ - ND_PRINT((ndo, " {")); + ND_PRINT(" {"); for (j=0; j> 4) + 3); } if (mrc != 100) { - ND_PRINT((ndo, " [max resp time ")); + ND_PRINT(" [max resp time "); if (mrt < 600) { - ND_PRINT((ndo, "%.1fs", mrt * 0.1)); + ND_PRINT("%.1fs", mrt * 0.1); } else { unsigned_relts_print(ndo, mrt / 10); } - ND_PRINT((ndo, "]")); + ND_PRINT("]"); } - ND_TCHECK2(bp[4], 4); - if (EXTRACT_32BITS(&bp[4]) == 0) + if (GET_BE_U_4(bp + 4) == 0) return; - ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[4]))); - ND_TCHECK2(bp[10], 2); - nsrcs = EXTRACT_16BITS(&bp[10]); + 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((ndo, " [invalid number of sources]")); + ND_PRINT(" [invalid number of sources]"); else if (ndo->ndo_vflag > 1) { - ND_PRINT((ndo, " {")); + ND_PRINT(" {"); for (i=0; indo_protocol = "igmp"; if (ndo->ndo_qflag) { - ND_PRINT((ndo, "igmp")); + ND_PRINT("igmp"); return; } - ND_TCHECK(bp[0]); - switch (bp[0]) { + switch (GET_U_1(bp)) { case 0x11: - ND_PRINT((ndo, "igmp query")); + ND_PRINT("igmp query"); if (len >= 12) print_igmpv3_query(ndo, bp, len); else { - ND_TCHECK(bp[1]); - if (bp[1]) { - ND_PRINT((ndo, " v2")); - if (bp[1] != 100) - ND_PRINT((ndo, " [max resp time %d]", bp[1])); + 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((ndo, " v1")); - ND_TCHECK2(bp[4], 4); - if (EXTRACT_32BITS(&bp[4])) - ND_PRINT((ndo, " [gaddr %s]", ipaddr_string(ndo, &bp[4]))); + ND_PRINT(" v1"); + if (GET_BE_U_4(bp + 4)) + ND_PRINT(" [gaddr %s]", GET_IPADDR_STRING(bp + 4)); if (len != 8) - ND_PRINT((ndo, " [len %d]", len)); + ND_PRINT(" [len %u]", len); } break; case 0x12: - ND_TCHECK2(bp[4], 4); - ND_PRINT((ndo, "igmp v1 report %s", ipaddr_string(ndo, &bp[4]))); + ND_PRINT("igmp v1 report %s", GET_IPADDR_STRING(bp + 4)); if (len != 8) - ND_PRINT((ndo, " [len %d]", len)); + ND_PRINT(" [len %u]", len); break; case 0x16: - ND_TCHECK2(bp[4], 4); - ND_PRINT((ndo, "igmp v2 report %s", ipaddr_string(ndo, &bp[4]))); + ND_PRINT("igmp v2 report %s", GET_IPADDR_STRING(bp + 4)); break; case 0x22: - ND_PRINT((ndo, "igmp v3 report")); + ND_PRINT("igmp v3 report"); print_igmpv3_report(ndo, bp, len); break; case 0x17: - ND_TCHECK2(bp[4], 4); - ND_PRINT((ndo, "igmp leave %s", ipaddr_string(ndo, &bp[4]))); + ND_PRINT("igmp leave %s", GET_IPADDR_STRING(bp + 4)); break; case 0x13: - ND_PRINT((ndo, "igmp dvmrp")); + ND_PRINT("igmp dvmrp"); if (len < 8) - ND_PRINT((ndo, " [len %d]", len)); + ND_PRINT(" [len %u]", len); else dvmrp_print(ndo, bp, len); break; case 0x14: - ND_PRINT((ndo, "igmp pimv1")); + ND_PRINT("igmp pimv1"); pimv1_print(ndo, bp, len); break; case 0x1e: - print_mresp(ndo, bp, len); + print_mtrace(ndo, "mresp", bp, len); break; case 0x1f: - print_mtrace(ndo, bp, len); + print_mtrace(ndo, "mtrace", bp, len); break; default: - ND_PRINT((ndo, "igmp-%d", bp[0])); + ND_PRINT("igmp-%u", GET_U_1(bp)); break; } - if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) { + 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((ndo, " bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]))); + ND_PRINT(" bad igmp cksum %x!", GET_BE_U_2(bp + 2)); } - return; -trunc: - ND_PRINT((ndo, "%s", tstr)); }