X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/7b1cba646d765868d21e7c66af54ed06f2a739b7..ebb51ef0e725737ca8c1d618da6527a58660d2bf:/print-isoclns.c diff --git a/print-isoclns.c b/print-isoclns.c index 2cbb3301..a3583e77 100644 --- a/print-isoclns.c +++ b/print-isoclns.c @@ -20,10 +20,12 @@ * * Original code by Matt Thomas, Digital Equipment Corporation * - * Extensively modified by Hannes Gredler (hannes@juniper.net) for more + * Extensively modified by Hannes Gredler (hannes@gredler.at) for more * complete IS-IS & CLNP support. */ +/* \summary: ISO CLNS, ESIS, and ISIS printer */ + #ifdef HAVE_CONFIG_H #include "config.h" #endif @@ -562,8 +564,8 @@ struct isis_tlv_ptp_adj { uint8_t neighbor_extd_local_circuit_id[4]; }; -static int osi_print_cksum(netdissect_options *, const uint8_t *pptr, - uint16_t checksum, int checksum_offset, int length); +static void osi_print_cksum(netdissect_options *, const uint8_t *pptr, + uint16_t checksum, int checksum_offset, u_int length); static int clnp_print(netdissect_options *, const uint8_t *, u_int); static void esis_print(netdissect_options *, const uint8_t *, u_int); static int isis_print(netdissect_options *, const uint8_t *, u_int); @@ -789,6 +791,18 @@ clnp_print(netdissect_options *ndo, return (0); } + if (li > length) { + ND_PRINT((ndo, " length indicator(%u) > PDU size (%u)!", li, length)); + return (0); + } + + if (li < sizeof(struct clnp_header_t)) { + ND_PRINT((ndo, " length indicator %u < min PDU size:", li)); + while (pptr < ndo->ndo_snapend) + ND_PRINT((ndo, "%02X", *pptr++)); + return (0); + } + /* FIXME further header sanity checking */ clnp_pdu_type = clnp_header->type & CLNP_PDU_TYPE_MASK; @@ -796,16 +810,40 @@ clnp_print(netdissect_options *ndo, pptr += sizeof(struct clnp_header_t); li -= sizeof(struct clnp_header_t); + + if (li < 1) { + ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses")); + return (0); + } + ND_TCHECK(*pptr); dest_address_length = *pptr; - dest_address = pptr + 1; + pptr += 1; + li -= 1; + if (li < dest_address_length) { + ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses")); + return (0); + } + ND_TCHECK2(*pptr, dest_address_length); + dest_address = pptr; + pptr += dest_address_length; + li -= dest_address_length; - pptr += (1 + dest_address_length); - li -= (1 + dest_address_length); + if (li < 1) { + ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses")); + return (0); + } + ND_TCHECK(*pptr); source_address_length = *pptr; - source_address = pptr +1; - - pptr += (1 + source_address_length); - li -= (1 + source_address_length); + pptr += 1; + li -= 1; + if (li < source_address_length) { + ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses")); + return (0); + } + ND_TCHECK2(*pptr, source_address_length); + source_address = pptr; + pptr += source_address_length; + li -= source_address_length; if (ndo->ndo_vflag < 1) { ND_PRINT((ndo, "%s%s > %s, %s, length %u", @@ -827,9 +865,8 @@ clnp_print(netdissect_options *ndo, EXTRACT_16BITS(clnp_header->segment_length), EXTRACT_16BITS(clnp_header->cksum))); - if (osi_print_cksum(ndo, optr, EXTRACT_16BITS(clnp_header->cksum), 7, - clnp_header->length_indicator) == 0) - goto trunc; + osi_print_cksum(ndo, optr, EXTRACT_16BITS(clnp_header->cksum), 7, + clnp_header->length_indicator); ND_PRINT((ndo, "\n\tFlags [%s]", bittok2str(clnp_flag_values, "none", clnp_flags))); @@ -841,6 +878,10 @@ clnp_print(netdissect_options *ndo, isonsap_string(ndo, dest_address, dest_address_length))); if (clnp_flags & CLNP_SEGMENT_PART) { + if (li < sizeof(const struct clnp_segment_header_t)) { + ND_PRINT((ndo, "li < size of fixed part of CLNP header, addresses, and segment part")); + return (0); + } clnp_segment_header = (const struct clnp_segment_header_t *) pptr; ND_TCHECK(*clnp_segment_header); ND_PRINT((ndo, "\n\tData Unit ID: 0x%04x, Segment Offset: %u, Total PDU Length: %u", @@ -856,19 +897,19 @@ clnp_print(netdissect_options *ndo, u_int op, opli; const uint8_t *tptr; - ND_TCHECK2(*pptr, 2); if (li < 2) { ND_PRINT((ndo, ", bad opts/li")); return (0); } + ND_TCHECK2(*pptr, 2); op = *pptr++; opli = *pptr++; li -= 2; - ND_TCHECK2(*pptr, opli); if (opli > li) { ND_PRINT((ndo, ", opt (%d) too long", op)); return (0); } + ND_TCHECK2(*pptr, opli); li -= opli; tptr = pptr; tlen = opli; @@ -878,11 +919,23 @@ clnp_print(netdissect_options *ndo, op, opli)); + /* + * We've already checked that the entire option is present + * in the captured packet with the ND_TCHECK2() call. + * Therefore, we don't need to do ND_TCHECK()/ND_TCHECK2() + * checks. + * We do, however, need to check tlen, to make sure we + * don't run past the end of the option. + */ switch (op) { case CLNP_OPTION_ROUTE_RECORDING: /* those two options share the format */ case CLNP_OPTION_SOURCE_ROUTING: + if (tlen < 2) { + ND_PRINT((ndo, ", bad opt len")); + return (0); + } ND_PRINT((ndo, "%s %s", tok2str(clnp_option_sr_rr_values,"Unknown",*tptr), tok2str(clnp_option_sr_rr_string_values, "Unknown Option %u", op))); @@ -916,10 +969,18 @@ clnp_print(netdissect_options *ndo, break; case CLNP_OPTION_PRIORITY: + if (tlen < 1) { + ND_PRINT((ndo, ", bad opt len")); + return (0); + } ND_PRINT((ndo, "0x%1x", *tptr&0x0f)); break; case CLNP_OPTION_QOS_MAINTENANCE: + if (tlen < 1) { + ND_PRINT((ndo, ", bad opt len")); + return (0); + } ND_PRINT((ndo, "\n\t Format Code: %s", tok2str(clnp_option_scope_values, "Reserved", *tptr&CLNP_OPTION_SCOPE_MASK))); @@ -931,12 +992,20 @@ clnp_print(netdissect_options *ndo, break; case CLNP_OPTION_SECURITY: + if (tlen < 2) { + ND_PRINT((ndo, ", bad opt len")); + return (0); + } ND_PRINT((ndo, "\n\t Format Code: %s, Security-Level %u", tok2str(clnp_option_scope_values,"Reserved",*tptr&CLNP_OPTION_SCOPE_MASK), *(tptr+1))); break; case CLNP_OPTION_DISCARD_REASON: + if (tlen < 1) { + ND_PRINT((ndo, ", bad opt len")); + return (0); + } rfd_error_major = (*tptr&0xf0) >> 4; rfd_error_minor = *tptr&0x0f; ND_PRINT((ndo, "\n\t Class: %s Error (0x%01x), %s (0x%01x)", @@ -1054,12 +1123,12 @@ esis_print(netdissect_options *ndo, } if (li > length) { - ND_PRINT((ndo, " length indicator(%d) > PDU size (%d)!", li, length)); + ND_PRINT((ndo, " length indicator(%u) > PDU size (%u)!", li, length)); return; } if (li < sizeof(struct esis_header_t) + 2) { - ND_PRINT((ndo, " length indicator < min PDU size %d:", li)); + ND_PRINT((ndo, " length indicator %u < min PDU size:", li)); while (pptr < ndo->ndo_snapend) ND_PRINT((ndo, "%02X", *pptr++)); return; @@ -1083,8 +1152,7 @@ esis_print(netdissect_options *ndo, ND_PRINT((ndo, ", v: %u%s", esis_header->version, esis_header->version == ESIS_VERSION ? "" : "unsupported" )); ND_PRINT((ndo, ", checksum: 0x%04x", EXTRACT_16BITS(esis_header->cksum))); - if (osi_print_cksum(ndo, pptr, EXTRACT_16BITS(esis_header->cksum), 7, li) == 0) - goto trunc; + osi_print_cksum(ndo, pptr, EXTRACT_16BITS(esis_header->cksum), 7, li); ND_PRINT((ndo, ", holding time: %us, length indicator: %u", EXTRACT_16BITS(esis_header->holdtime), li)); @@ -1344,8 +1412,7 @@ isis_print_mt_port_cap_subtlv(netdissect_options *ndo, { case ISIS_SUBTLV_SPB_MCID: { - if (!ND_TTEST2(*(tptr), ISIS_SUBTLV_SPB_MCID_MIN_LEN)) - goto trunctlv; + ND_TCHECK2(*(tptr), ISIS_SUBTLV_SPB_MCID_MIN_LEN); subtlv_spb_mcid = (const struct isis_subtlv_spb_mcid *)tptr; @@ -1368,8 +1435,7 @@ isis_print_mt_port_cap_subtlv(netdissect_options *ndo, case ISIS_SUBTLV_SPB_DIGEST: { - if (!ND_TTEST2(*(tptr), ISIS_SUBTLV_SPB_DIGEST_MIN_LEN)) - goto trunctlv; + ND_TCHECK2(*(tptr), ISIS_SUBTLV_SPB_DIGEST_MIN_LEN); ND_PRINT((ndo, "\n\t RES: %d V: %d A: %d D: %d", (*(tptr) >> 5), (((*tptr)>> 4) & 0x01), @@ -1394,13 +1460,11 @@ isis_print_mt_port_cap_subtlv(netdissect_options *ndo, case ISIS_SUBTLV_SPB_BVID: { - if (!ND_TTEST2(*(tptr), stlv_len)) - goto trunctlv; + ND_TCHECK2(*(tptr), stlv_len); while (len >= ISIS_SUBTLV_SPB_BVID_MIN_LEN) { - if (!ND_TTEST2(*(tptr), ISIS_SUBTLV_SPB_BVID_MIN_LEN)) - goto trunctlv; + ND_TCHECK2(*(tptr), ISIS_SUBTLV_SPB_BVID_MIN_LEN); ND_PRINT((ndo, "\n\t ECT: %08x", EXTRACT_32BITS(tptr))); @@ -1426,7 +1490,7 @@ isis_print_mt_port_cap_subtlv(netdissect_options *ndo, return 0; - trunctlv: + trunc: ND_PRINT((ndo, "\n\t\t")); ND_PRINT((ndo, "%s", tstr)); return(1); @@ -1665,13 +1729,12 @@ isis_print_ip_reach_subtlv(netdissect_options *ndo, const uint8_t *tptr, int subt, int subl, const char *ident) { - /* first lets see if we know the subTLVs name*/ - ND_PRINT((ndo, "%s%s subTLV #%u, length: %u", - ident, tok2str(isis_ext_ip_reach_subtlv_values, "unknown", subt), - subt, subl)); + /* first lets see if we know the subTLVs name*/ + ND_PRINT((ndo, "%s%s subTLV #%u, length: %u", + ident, tok2str(isis_ext_ip_reach_subtlv_values, "unknown", subt), + subt, subl)); - if (!ND_TTEST2(*tptr,subl)) - goto trunctlv; + ND_TCHECK2(*tptr,subl); switch(subt) { case ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR: /* fall through */ @@ -1700,7 +1763,7 @@ isis_print_ip_reach_subtlv(netdissect_options *ndo, } return(1); -trunctlv: +trunc: ND_PRINT((ndo, "%s", ident)); ND_PRINT((ndo, "%s", tstr)); return(0); @@ -2099,6 +2162,8 @@ isis_print(netdissect_options *ndo, TLV verification */ isis_header = (const struct isis_common_header *)p; ND_TCHECK(*isis_header); + if (length < ISIS_COMMON_HEADER_SIZE) + goto trunc; pptr = p+(ISIS_COMMON_HEADER_SIZE); header_iih_lan = (const struct isis_iih_lan_header *)pptr; header_iih_ptp = (const struct isis_iih_ptp_header *)pptr; @@ -2129,6 +2194,16 @@ isis_print(netdissect_options *ndo, return (0); } + if (length < isis_header->fixed_len) { + ND_PRINT((ndo, "fixed header length %u > packet length %u", isis_header->fixed_len, length)); + return (0); + } + + if (isis_header->fixed_len < ISIS_COMMON_HEADER_SIZE) { + ND_PRINT((ndo, "fixed header length %u < minimum header size %u", isis_header->fixed_len, (u_int)ISIS_COMMON_HEADER_SIZE)); + return (0); + } + max_area = isis_header->max_area; switch(max_area) { case 0: @@ -2171,254 +2246,255 @@ isis_print(netdissect_options *ndo, pdu_type=isis_header->pdu_type; /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/ - if (ndo->ndo_vflag < 1) { + if (ndo->ndo_vflag == 0) { ND_PRINT((ndo, "%s%s", ndo->ndo_eflag ? "" : ", ", tok2str(isis_pdu_values, "unknown PDU-Type %u", pdu_type))); + } else { + /* ok they seem to want to know everything - lets fully decode it */ + ND_PRINT((ndo, "%slength %u", ndo->ndo_eflag ? "" : ", ", length)); - switch (pdu_type) { - - case ISIS_PDU_L1_LAN_IIH: - case ISIS_PDU_L2_LAN_IIH: - ND_TCHECK(*header_iih_lan); - ND_PRINT((ndo, ", src-id %s", - isis_print_id(header_iih_lan->source_id, SYSTEM_ID_LEN))); - ND_PRINT((ndo, ", lan-id %s, prio %u", - isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN), - header_iih_lan->priority)); - break; - case ISIS_PDU_PTP_IIH: - ND_TCHECK(*header_iih_ptp); - ND_PRINT((ndo, ", src-id %s", isis_print_id(header_iih_ptp->source_id, SYSTEM_ID_LEN))); - break; - case ISIS_PDU_L1_LSP: - case ISIS_PDU_L2_LSP: - ND_TCHECK(*header_lsp); - ND_PRINT((ndo, ", lsp-id %s, seq 0x%08x, lifetime %5us", - isis_print_id(header_lsp->lsp_id, LSP_ID_LEN), - EXTRACT_32BITS(header_lsp->sequence_number), - EXTRACT_16BITS(header_lsp->remaining_lifetime))); - break; - case ISIS_PDU_L1_CSNP: - case ISIS_PDU_L2_CSNP: - ND_TCHECK(*header_csnp); - ND_PRINT((ndo, ", src-id %s", isis_print_id(header_csnp->source_id, NODE_ID_LEN))); - break; - case ISIS_PDU_L1_PSNP: - case ISIS_PDU_L2_PSNP: - ND_TCHECK(*header_psnp); - ND_PRINT((ndo, ", src-id %s", isis_print_id(header_psnp->source_id, NODE_ID_LEN))); - break; - - } - ND_PRINT((ndo, ", length %u", length)); - - return(1); - } - - /* ok they seem to want to know everything - lets fully decode it */ - ND_PRINT((ndo, "%slength %u", ndo->ndo_eflag ? "" : ", ", length)); - - ND_PRINT((ndo, "\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)", - tok2str(isis_pdu_values, - "unknown, type %u", - pdu_type), - isis_header->fixed_len, - isis_header->version, - isis_header->pdu_version, - id_length, - isis_header->id_length, - max_area, - isis_header->max_area)); - - if (ndo->ndo_vflag > 1) { - if (!print_unknown_data(ndo, optr, "\n\t", 8)) /* provide the _o_riginal pointer */ - return(0); /* for optionally debugging the common header */ + ND_PRINT((ndo, "\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)", + tok2str(isis_pdu_values, + "unknown, type %u", + pdu_type), + isis_header->fixed_len, + isis_header->version, + isis_header->pdu_version, + id_length, + isis_header->id_length, + max_area, + isis_header->max_area)); + + if (ndo->ndo_vflag > 1) { + if (!print_unknown_data(ndo, optr, "\n\t", 8)) /* provide the _o_riginal pointer */ + return (0); /* for optionally debugging the common header */ + } } switch (pdu_type) { case ISIS_PDU_L1_LAN_IIH: case ISIS_PDU_L2_LAN_IIH: - if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) { - ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", - isis_header->fixed_len, (unsigned long)ISIS_IIH_LAN_HEADER_SIZE)); - return (0); - } - - ND_TCHECK(*header_iih_lan); - pdu_len=EXTRACT_16BITS(header_iih_lan->pdu_len); - if (packet_len>pdu_len) { - packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ - length=pdu_len; - } + if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) { + ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", + isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE))); + return (0); + } + ND_TCHECK(*header_iih_lan); + if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE) + goto trunc; + if (ndo->ndo_vflag == 0) { + ND_PRINT((ndo, ", src-id %s", + isis_print_id(header_iih_lan->source_id, SYSTEM_ID_LEN))); + ND_PRINT((ndo, ", lan-id %s, prio %u", + isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN), + header_iih_lan->priority)); + ND_PRINT((ndo, ", length %u", length)); + return (1); + } + pdu_len=EXTRACT_16BITS(header_iih_lan->pdu_len); + if (packet_len>pdu_len) { + packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ + length=pdu_len; + } - ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]", - isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN), - EXTRACT_16BITS(header_iih_lan->holding_time), - tok2str(isis_iih_circuit_type_values, - "unknown circuit type 0x%02x", - header_iih_lan->circuit_type))); + ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]", + isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN), + EXTRACT_16BITS(header_iih_lan->holding_time), + tok2str(isis_iih_circuit_type_values, + "unknown circuit type 0x%02x", + header_iih_lan->circuit_type))); - ND_PRINT((ndo, "\n\t lan-id: %s, Priority: %u, PDU length: %u", - isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN), - (header_iih_lan->priority) & ISIS_LAN_PRIORITY_MASK, - pdu_len)); + ND_PRINT((ndo, "\n\t lan-id: %s, Priority: %u, PDU length: %u", + isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN), + (header_iih_lan->priority) & ISIS_LAN_PRIORITY_MASK, + pdu_len)); - if (ndo->ndo_vflag > 1) { - if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_LAN_HEADER_SIZE)) - return(0); - } + if (ndo->ndo_vflag > 1) { + if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_LAN_HEADER_SIZE)) + return (0); + } - packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE); - pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE); - break; + packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE); + pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE); + break; case ISIS_PDU_PTP_IIH: - if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) { - ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", - isis_header->fixed_len, (unsigned long)ISIS_IIH_PTP_HEADER_SIZE)); - return (0); - } - - ND_TCHECK(*header_iih_ptp); - pdu_len=EXTRACT_16BITS(header_iih_ptp->pdu_len); - if (packet_len>pdu_len) { + if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) { + ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", + isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE))); + return (0); + } + ND_TCHECK(*header_iih_ptp); + if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE) + goto trunc; + if (ndo->ndo_vflag == 0) { + ND_PRINT((ndo, ", src-id %s", isis_print_id(header_iih_ptp->source_id, SYSTEM_ID_LEN))); + ND_PRINT((ndo, ", length %u", length)); + return (1); + } + pdu_len=EXTRACT_16BITS(header_iih_ptp->pdu_len); + if (packet_len>pdu_len) { packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ length=pdu_len; - } + } - ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]", - isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN), - EXTRACT_16BITS(header_iih_ptp->holding_time), - tok2str(isis_iih_circuit_type_values, - "unknown circuit type 0x%02x", - header_iih_ptp->circuit_type))); + ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]", + isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN), + EXTRACT_16BITS(header_iih_ptp->holding_time), + tok2str(isis_iih_circuit_type_values, + "unknown circuit type 0x%02x", + header_iih_ptp->circuit_type))); - ND_PRINT((ndo, "\n\t circuit-id: 0x%02x, PDU length: %u", - header_iih_ptp->circuit_id, - pdu_len)); + ND_PRINT((ndo, "\n\t circuit-id: 0x%02x, PDU length: %u", + header_iih_ptp->circuit_id, + pdu_len)); - if (ndo->ndo_vflag > 1) { - if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_PTP_HEADER_SIZE)) - return(0); - } + if (ndo->ndo_vflag > 1) { + if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_PTP_HEADER_SIZE)) + return (0); + } - packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE); - pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE); - break; + packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE); + pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE); + break; case ISIS_PDU_L1_LSP: case ISIS_PDU_L2_LSP: - if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) { - ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", - isis_header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE)); - return (0); - } - - ND_TCHECK(*header_lsp); - pdu_len=EXTRACT_16BITS(header_lsp->pdu_len); - if (packet_len>pdu_len) { + if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) { + ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", + isis_header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE)); + return (0); + } + ND_TCHECK(*header_lsp); + if (length < ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE) + goto trunc; + if (ndo->ndo_vflag == 0) { + ND_PRINT((ndo, ", lsp-id %s, seq 0x%08x, lifetime %5us", + isis_print_id(header_lsp->lsp_id, LSP_ID_LEN), + EXTRACT_32BITS(header_lsp->sequence_number), + EXTRACT_16BITS(header_lsp->remaining_lifetime))); + ND_PRINT((ndo, ", length %u", length)); + return (1); + } + pdu_len=EXTRACT_16BITS(header_lsp->pdu_len); + if (packet_len>pdu_len) { packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ length=pdu_len; - } + } - ND_PRINT((ndo, "\n\t lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t chksum: 0x%04x", + ND_PRINT((ndo, "\n\t lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t chksum: 0x%04x", isis_print_id(header_lsp->lsp_id, LSP_ID_LEN), EXTRACT_32BITS(header_lsp->sequence_number), EXTRACT_16BITS(header_lsp->remaining_lifetime), EXTRACT_16BITS(header_lsp->checksum))); - if (osi_print_cksum(ndo, (const uint8_t *)header_lsp->lsp_id, - EXTRACT_16BITS(header_lsp->checksum), - 12, length-12) == 0) - goto trunc; + osi_print_cksum(ndo, (const uint8_t *)header_lsp->lsp_id, + EXTRACT_16BITS(header_lsp->checksum), + 12, length-12); - ND_PRINT((ndo, ", PDU length: %u, Flags: [ %s", + ND_PRINT((ndo, ", PDU length: %u, Flags: [ %s", pdu_len, ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : "")); - if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) { - ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : "")); - ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : "")); - ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : "")); - ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : "")); - ND_PRINT((ndo, "ATT bit set, ")); - } - ND_PRINT((ndo, "%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : "")); - ND_PRINT((ndo, "%s ]", tok2str(isis_lsp_istype_values, "Unknown(0x%x)", - ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)))); + if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) { + ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : "")); + ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : "")); + ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : "")); + ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : "")); + ND_PRINT((ndo, "ATT bit set, ")); + } + ND_PRINT((ndo, "%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : "")); + ND_PRINT((ndo, "%s ]", tok2str(isis_lsp_istype_values, "Unknown(0x%x)", + ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)))); - if (ndo->ndo_vflag > 1) { - if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_LSP_HEADER_SIZE)) - return(0); - } + if (ndo->ndo_vflag > 1) { + if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_LSP_HEADER_SIZE)) + return (0); + } - packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE); - pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE); - break; + packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE); + pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE); + break; case ISIS_PDU_L1_CSNP: case ISIS_PDU_L2_CSNP: - if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) { - ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", - isis_header->fixed_len, (unsigned long)ISIS_CSNP_HEADER_SIZE)); - return (0); - } - - ND_TCHECK(*header_csnp); - pdu_len=EXTRACT_16BITS(header_csnp->pdu_len); - if (packet_len>pdu_len) { + if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) { + ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", + isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE))); + return (0); + } + ND_TCHECK(*header_csnp); + if (length < ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE) + goto trunc; + if (ndo->ndo_vflag == 0) { + ND_PRINT((ndo, ", src-id %s", isis_print_id(header_csnp->source_id, NODE_ID_LEN))); + ND_PRINT((ndo, ", length %u", length)); + return (1); + } + pdu_len=EXTRACT_16BITS(header_csnp->pdu_len); + if (packet_len>pdu_len) { packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ length=pdu_len; - } + } - ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u", + ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u", isis_print_id(header_csnp->source_id, NODE_ID_LEN), pdu_len)); - ND_PRINT((ndo, "\n\t start lsp-id: %s", + ND_PRINT((ndo, "\n\t start lsp-id: %s", isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN))); - ND_PRINT((ndo, "\n\t end lsp-id: %s", + ND_PRINT((ndo, "\n\t end lsp-id: %s", isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN))); - if (ndo->ndo_vflag > 1) { - if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_CSNP_HEADER_SIZE)) - return(0); - } + if (ndo->ndo_vflag > 1) { + if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_CSNP_HEADER_SIZE)) + return (0); + } - packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE); - pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE); + packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE); + pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE); break; case ISIS_PDU_L1_PSNP: case ISIS_PDU_L2_PSNP: - if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) { - ND_PRINT((ndo, "- bogus fixed header length %u should be %lu", - isis_header->fixed_len, (unsigned long)ISIS_PSNP_HEADER_SIZE)); - return (0); - } - - ND_TCHECK(*header_psnp); - pdu_len=EXTRACT_16BITS(header_psnp->pdu_len); - if (packet_len>pdu_len) { + if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) { + ND_PRINT((ndo, "- bogus fixed header length %u should be %lu", + isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE))); + return (0); + } + ND_TCHECK(*header_psnp); + if (length < ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE) + goto trunc; + if (ndo->ndo_vflag == 0) { + ND_PRINT((ndo, ", src-id %s", isis_print_id(header_psnp->source_id, NODE_ID_LEN))); + ND_PRINT((ndo, ", length %u", length)); + return (1); + } + pdu_len=EXTRACT_16BITS(header_psnp->pdu_len); + if (packet_len>pdu_len) { packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ length=pdu_len; - } + } - ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u", + ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u", isis_print_id(header_psnp->source_id, NODE_ID_LEN), pdu_len)); - if (ndo->ndo_vflag > 1) { - if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_PSNP_HEADER_SIZE)) - return(0); - } + if (ndo->ndo_vflag > 1) { + if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_PSNP_HEADER_SIZE)) + return (0); + } - packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE); - pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE); - break; + packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE); + pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE); + break; default: + if (ndo->ndo_vflag == 0) { + ND_PRINT((ndo, ", length %u", length)); + return (1); + } (void)print_unknown_data(ndo, pptr, "\n\t ", length); return (0); } @@ -2427,20 +2503,15 @@ isis_print(netdissect_options *ndo, * Now print the TLV's. */ - while (packet_len >= 2) { - if (pptr == ndo->ndo_snapend) { - return (1); - } - + while (packet_len > 0) { ND_TCHECK2(*pptr, 2); + if (packet_len < 2) + goto trunc; tlv_type = *pptr++; tlv_len = *pptr++; tmp =tlv_len; /* copy temporary len & pointer to packet data */ tptr = pptr; packet_len -= 2; - if (tlv_len > packet_len) { - break; - } /* first lets see if we know the TLVs name*/ ND_PRINT((ndo, "\n\t %s TLV #%u, length: %u", @@ -2453,11 +2524,13 @@ isis_print(netdissect_options *ndo, if (tlv_len == 0) /* something is invalid */ continue; + if (packet_len < tlv_len) + goto trunc; + /* now check if we have a decoder otherwise do a hexdump at the end*/ switch (tlv_type) { case ISIS_TLV_AREA_ADDR: - if (!ND_TTEST2(*tptr, 1)) - goto trunctlv; + ND_TCHECK2(*tptr, 1); alen = *tptr++; while (tmp && alen < tmp) { ND_PRINT((ndo, "\n\t Area address (length: %u): %s", @@ -2467,15 +2540,13 @@ isis_print(netdissect_options *ndo, tmp -= alen + 1; if (tmp==0) /* if this is the last area address do not attemt a boundary check */ break; - if (!ND_TTEST2(*tptr, 1)) - goto trunctlv; + ND_TCHECK2(*tptr, 1); alen = *tptr++; } break; case ISIS_TLV_ISNEIGH: while (tmp >= ETHER_ADDR_LEN) { - if (!ND_TTEST2(*tptr, ETHER_ADDR_LEN)) - goto trunctlv; + ND_TCHECK2(*tptr, ETHER_ADDR_LEN); ND_PRINT((ndo, "\n\t SNPA: %s", isis_print_id(tptr, ETHER_ADDR_LEN))); tmp -= ETHER_ADDR_LEN; tptr += ETHER_ADDR_LEN; @@ -2493,8 +2564,7 @@ isis_print(netdissect_options *ndo, tmp --; ND_PRINT((ndo, "\n\t LAN address length %u bytes ", lan_alen)); while (tmp >= lan_alen) { - if (!ND_TTEST2(*tptr, lan_alen)) - goto trunctlv; + ND_TCHECK2(*tptr, lan_alen); ND_PRINT((ndo, "\n\t\tIS Neighbor: %s", isis_print_id(tptr, lan_alen))); tmp -= lan_alen; tptr +=lan_alen; @@ -2540,16 +2610,14 @@ isis_print(netdissect_options *ndo, } break; case ISIS_TLV_IS_REACH: - if (!ND_TTEST2(*tptr,1)) /* check if there is one byte left to read out the virtual flag */ - goto trunctlv; + ND_TCHECK2(*tptr,1); /* check if there is one byte left to read out the virtual flag */ ND_PRINT((ndo, "\n\t %s", tok2str(isis_is_reach_virtual_values, "bogus virtual flag 0x%02x", *tptr++))); tlv_is_reach = (const struct isis_tlv_is_reach *)tptr; while (tmp >= sizeof(struct isis_tlv_is_reach)) { - if (!ND_TTEST(*tlv_is_reach)) - goto trunctlv; + ND_TCHECK(*tlv_is_reach); ND_PRINT((ndo, "\n\t IS Neighbor: %s", isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN))); isis_print_metric_block(ndo, &tlv_is_reach->isis_metric_block); @@ -2561,8 +2629,7 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_ESNEIGH: tlv_es_reach = (const struct isis_tlv_es_reach *)tptr; while (tmp >= sizeof(struct isis_tlv_es_reach)) { - if (!ND_TTEST(*tlv_es_reach)) - goto trunctlv; + ND_TCHECK(*tlv_es_reach); ND_PRINT((ndo, "\n\t ES Neighbor: %s", isis_print_id(tlv_es_reach->neighbor_sysid, SYSTEM_ID_LEN))); isis_print_metric_block(ndo, &tlv_es_reach->isis_metric_block); @@ -2634,8 +2701,7 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_IP6ADDR: while (tmp>=sizeof(struct in6_addr)) { - if (!ND_TTEST2(*tptr, sizeof(struct in6_addr))) - goto trunctlv; + ND_TCHECK2(*tptr, sizeof(struct in6_addr)); ND_PRINT((ndo, "\n\t IPv6 interface address: %s", ip6addr_string(ndo, tptr))); @@ -2645,8 +2711,7 @@ isis_print(netdissect_options *ndo, } break; case ISIS_TLV_AUTH: - if (!ND_TTEST2(*tptr, 1)) - goto trunctlv; + ND_TCHECK2(*tptr, 1); ND_PRINT((ndo, "\n\t %s: ", tok2str(isis_subtlv_auth_values, @@ -2660,8 +2725,7 @@ isis_print(netdissect_options *ndo, break; case ISIS_SUBTLV_AUTH_MD5: for(i=1;i=1) { - if (!ND_TTEST2(*tptr, 1)) - goto trunctlv; + ND_TCHECK2(*tptr, 1); ND_PRINT((ndo, "\n\t Adjacency State: %s (%u)", tok2str(isis_ptp_adjancey_values, "unknown", *tptr), *tptr)); tmp--; } if(tmp>sizeof(tlv_ptp_adj->extd_local_circuit_id)) { - if (!ND_TTEST2(tlv_ptp_adj->extd_local_circuit_id, - sizeof(tlv_ptp_adj->extd_local_circuit_id))) - goto trunctlv; + ND_TCHECK(tlv_ptp_adj->extd_local_circuit_id); ND_PRINT((ndo, "\n\t Extended Local circuit-ID: 0x%08x", EXTRACT_32BITS(tlv_ptp_adj->extd_local_circuit_id))); tmp-=sizeof(tlv_ptp_adj->extd_local_circuit_id); } if(tmp>=SYSTEM_ID_LEN) { - if (!ND_TTEST2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN)) - goto trunctlv; + ND_TCHECK2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN); ND_PRINT((ndo, "\n\t Neighbor System-ID: %s", isis_print_id(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN))); tmp-=SYSTEM_ID_LEN; } if(tmp>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) { - if (!ND_TTEST2(tlv_ptp_adj->neighbor_extd_local_circuit_id, - sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id))) - goto trunctlv; + ND_TCHECK(tlv_ptp_adj->neighbor_extd_local_circuit_id); ND_PRINT((ndo, "\n\t Neighbor Extended Local circuit-ID: 0x%08x", EXTRACT_32BITS(tlv_ptp_adj->neighbor_extd_local_circuit_id))); } @@ -2728,8 +2785,7 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_PROTOCOLS: ND_PRINT((ndo, "\n\t NLPID(s): ")); while (tmp>0) { - if (!ND_TTEST2(*(tptr), 1)) - goto trunctlv; + ND_TCHECK2(*(tptr), 1); ND_PRINT((ndo, "%s (0x%02x)", tok2str(nlpid_values, "unknown", @@ -2744,8 +2800,7 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_MT_PORT_CAP: { - if (!ND_TTEST2(*(tptr), 2)) - goto trunctlv; + ND_TCHECK2(*(tptr), 2); ND_PRINT((ndo, "\n\t RES: %d, MTID(s): %d", (EXTRACT_16BITS (tptr) >> 12), @@ -2762,8 +2817,7 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_MT_CAPABILITY: - if (!ND_TTEST2(*(tptr), 2)) - goto trunctlv; + ND_TCHECK2(*(tptr), 2); ND_PRINT((ndo, "\n\t O: %d, RES: %d, MTID(s): %d", (EXTRACT_16BITS(tptr) >> 15) & 0x01, @@ -2779,15 +2833,13 @@ isis_print(netdissect_options *ndo, break; case ISIS_TLV_TE_ROUTER_ID: - if (!ND_TTEST2(*pptr, sizeof(struct in_addr))) - goto trunctlv; + ND_TCHECK2(*pptr, sizeof(struct in_addr)); ND_PRINT((ndo, "\n\t Traffic Engineering Router ID: %s", ipaddr_string(ndo, pptr))); break; case ISIS_TLV_IPADDR: while (tmp>=sizeof(struct in_addr)) { - if (!ND_TTEST2(*tptr, sizeof(struct in_addr))) - goto trunctlv; + ND_TCHECK2(*tptr, sizeof(struct in_addr)); ND_PRINT((ndo, "\n\t IPv4 interface address: %s", ipaddr_string(ndo, tptr))); tptr += sizeof(struct in_addr); tmp -= sizeof(struct in_addr); @@ -2803,38 +2855,33 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_SHARED_RISK_GROUP: if (tmp < NODE_ID_LEN) break; - if (!ND_TTEST2(*tptr, NODE_ID_LEN)) - goto trunctlv; + ND_TCHECK2(*tptr, NODE_ID_LEN); ND_PRINT((ndo, "\n\t IS Neighbor: %s", isis_print_id(tptr, NODE_ID_LEN))); tptr+=(NODE_ID_LEN); tmp-=(NODE_ID_LEN); if (tmp < 1) break; - if (!ND_TTEST2(*tptr, 1)) - goto trunctlv; + ND_TCHECK2(*tptr, 1); ND_PRINT((ndo, ", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered")); tmp--; if (tmp < sizeof(struct in_addr)) break; - if (!ND_TTEST2(*tptr, sizeof(struct in_addr))) - goto trunctlv; + ND_TCHECK2(*tptr, sizeof(struct in_addr)); ND_PRINT((ndo, "\n\t IPv4 interface address: %s", ipaddr_string(ndo, tptr))); tptr+=sizeof(struct in_addr); tmp-=sizeof(struct in_addr); if (tmp < sizeof(struct in_addr)) break; - if (!ND_TTEST2(*tptr, sizeof(struct in_addr))) - goto trunctlv; + ND_TCHECK2(*tptr, sizeof(struct in_addr)); ND_PRINT((ndo, "\n\t IPv4 neighbor address: %s", ipaddr_string(ndo, tptr))); tptr+=sizeof(struct in_addr); tmp-=sizeof(struct in_addr); while (tmp>=4) { - if (!ND_TTEST2(*tptr, 4)) - goto trunctlv; + ND_TCHECK2(*tptr, 4); ND_PRINT((ndo, "\n\t Link-ID: 0x%08x", EXTRACT_32BITS(tptr))); tptr+=4; tmp-=4; @@ -2844,18 +2891,14 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_LSP: tlv_lsp = (const struct isis_tlv_lsp *)tptr; while(tmp>=sizeof(struct isis_tlv_lsp)) { - if (!ND_TTEST((tlv_lsp->lsp_id)[LSP_ID_LEN-1])) - goto trunctlv; + ND_TCHECK((tlv_lsp->lsp_id)[LSP_ID_LEN-1]); ND_PRINT((ndo, "\n\t lsp-id: %s", isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN))); - if (!ND_TTEST2(tlv_lsp->sequence_number, 4)) - goto trunctlv; + ND_TCHECK2(tlv_lsp->sequence_number, 4); ND_PRINT((ndo, ", seq: 0x%08x", EXTRACT_32BITS(tlv_lsp->sequence_number))); - if (!ND_TTEST2(tlv_lsp->remaining_lifetime, 2)) - goto trunctlv; + ND_TCHECK2(tlv_lsp->remaining_lifetime, 2); ND_PRINT((ndo, ", lifetime: %5ds", EXTRACT_16BITS(tlv_lsp->remaining_lifetime))); - if (!ND_TTEST2(tlv_lsp->checksum, 2)) - goto trunctlv; + ND_TCHECK2(tlv_lsp->checksum, 2); ND_PRINT((ndo, ", chksum: 0x%04x", EXTRACT_16BITS(tlv_lsp->checksum))); tmp-=sizeof(struct isis_tlv_lsp); tlv_lsp++; @@ -2865,30 +2908,26 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_CHECKSUM: if (tmp < ISIS_TLV_CHECKSUM_MINLEN) break; - if (!ND_TTEST2(*tptr, ISIS_TLV_CHECKSUM_MINLEN)) - goto trunctlv; + ND_TCHECK2(*tptr, ISIS_TLV_CHECKSUM_MINLEN); ND_PRINT((ndo, "\n\t checksum: 0x%04x ", EXTRACT_16BITS(tptr))); /* do not attempt to verify the checksum if it is zero * most likely a HMAC-MD5 TLV is also present and * to avoid conflicts the checksum TLV is zeroed. * see rfc3358 for details */ - if (osi_print_cksum(ndo, optr, EXTRACT_16BITS(tptr), tptr-optr, - length) == 0) - goto trunc; + osi_print_cksum(ndo, optr, EXTRACT_16BITS(tptr), tptr-optr, + length); break; case ISIS_TLV_POI: if (tlv_len >= SYSTEM_ID_LEN + 1) { - if (!ND_TTEST2(*tptr, SYSTEM_ID_LEN + 1)) - goto trunctlv; + ND_TCHECK2(*tptr, SYSTEM_ID_LEN + 1); ND_PRINT((ndo, "\n\t Purge Originator System-ID: %s", isis_print_id(tptr + 1, SYSTEM_ID_LEN))); } if (tlv_len == 2 * SYSTEM_ID_LEN + 1) { - if (!ND_TTEST2(*tptr, 2 * SYSTEM_ID_LEN + 1)) - goto trunctlv; + ND_TCHECK2(*tptr, 2 * SYSTEM_ID_LEN + 1); ND_PRINT((ndo, "\n\t Received from System-ID: %s", isis_print_id(tptr + SYSTEM_ID_LEN + 1, SYSTEM_ID_LEN))); } @@ -2917,8 +2956,7 @@ isis_print(netdissect_options *ndo, /* first attempt to decode the flags */ if (tmp < ISIS_TLV_RESTART_SIGNALING_FLAGLEN) break; - if (!ND_TTEST2(*tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN)) - goto trunctlv; + ND_TCHECK2(*tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN); ND_PRINT((ndo, "\n\t Flags [%s]", bittok2str(isis_restart_flag_values, "none", *tptr))); tptr+=ISIS_TLV_RESTART_SIGNALING_FLAGLEN; @@ -2930,8 +2968,7 @@ isis_print(netdissect_options *ndo, if (tmp < ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN) break; - if (!ND_TTEST2(*tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN)) - goto trunctlv; + ND_TCHECK2(*tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN); ND_PRINT((ndo, ", Remaining holding time %us", EXTRACT_16BITS(tptr))); tptr+=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN; @@ -2939,8 +2976,7 @@ isis_print(netdissect_options *ndo, /* is there an additional sysid field present ?*/ if (tmp == SYSTEM_ID_LEN) { - if (!ND_TTEST2(*tptr, SYSTEM_ID_LEN)) - goto trunctlv; + ND_TCHECK2(*tptr, SYSTEM_ID_LEN); ND_PRINT((ndo, ", for %s", isis_print_id(tptr,SYSTEM_ID_LEN))); } break; @@ -2948,16 +2984,14 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_IDRP_INFO: if (tmp < ISIS_TLV_IDRP_INFO_MINLEN) break; - if (!ND_TTEST2(*tptr, ISIS_TLV_IDRP_INFO_MINLEN)) - goto trunctlv; + ND_TCHECK2(*tptr, ISIS_TLV_IDRP_INFO_MINLEN); ND_PRINT((ndo, "\n\t Inter-Domain Information Type: %s", tok2str(isis_subtlv_idrp_values, "Unknown (0x%02x)", *tptr))); switch (*tptr++) { case ISIS_SUBTLV_IDRP_ASN: - if (!ND_TTEST2(*tptr, 2)) /* fetch AS number */ - goto trunctlv; + ND_TCHECK2(*tptr, 2); /* fetch AS number */ ND_PRINT((ndo, "AS Number: %u", EXTRACT_16BITS(tptr))); break; case ISIS_SUBTLV_IDRP_LOCAL: @@ -2972,15 +3006,13 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_LSP_BUFFERSIZE: if (tmp < ISIS_TLV_LSP_BUFFERSIZE_MINLEN) break; - if (!ND_TTEST2(*tptr, ISIS_TLV_LSP_BUFFERSIZE_MINLEN)) - goto trunctlv; + ND_TCHECK2(*tptr, ISIS_TLV_LSP_BUFFERSIZE_MINLEN); ND_PRINT((ndo, "\n\t LSP Buffersize: %u", EXTRACT_16BITS(tptr))); break; case ISIS_TLV_PART_DIS: while (tmp >= SYSTEM_ID_LEN) { - if (!ND_TTEST2(*tptr, SYSTEM_ID_LEN)) - goto trunctlv; + ND_TCHECK2(*tptr, SYSTEM_ID_LEN); ND_PRINT((ndo, "\n\t %s", isis_print_id(tptr, SYSTEM_ID_LEN))); tptr+=SYSTEM_ID_LEN; tmp-=SYSTEM_ID_LEN; @@ -2990,16 +3022,14 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_PREFIX_NEIGH: if (tmp < sizeof(struct isis_metric_block)) break; - if (!ND_TTEST2(*tptr, sizeof(struct isis_metric_block))) - goto trunctlv; + ND_TCHECK2(*tptr, sizeof(struct isis_metric_block)); ND_PRINT((ndo, "\n\t Metric Block")); isis_print_metric_block(ndo, (const struct isis_metric_block *)tptr); tptr+=sizeof(struct isis_metric_block); tmp-=sizeof(struct isis_metric_block); while(tmp>0) { - if (!ND_TTEST2(*tptr, 1)) - goto trunctlv; + ND_TCHECK2(*tptr, 1); prefix_len=*tptr++; /* read out prefix length in semioctets*/ if (prefix_len < 2) { ND_PRINT((ndo, "\n\t\tAddress: prefix length %u < 2", prefix_len)); @@ -3008,8 +3038,7 @@ isis_print(netdissect_options *ndo, tmp--; if (tmp < prefix_len/2) break; - if (!ND_TTEST2(*tptr, prefix_len / 2)) - goto trunctlv; + ND_TCHECK2(*tptr, prefix_len / 2); ND_PRINT((ndo, "\n\t\tAddress: %s/%u", isonsap_string(ndo, tptr, prefix_len / 2), prefix_len * 4)); tptr+=prefix_len/2; @@ -3020,16 +3049,14 @@ isis_print(netdissect_options *ndo, case ISIS_TLV_IIH_SEQNR: if (tmp < ISIS_TLV_IIH_SEQNR_MINLEN) break; - if (!ND_TTEST2(*tptr, ISIS_TLV_IIH_SEQNR_MINLEN)) /* check if four bytes are on the wire */ - goto trunctlv; + ND_TCHECK2(*tptr, ISIS_TLV_IIH_SEQNR_MINLEN); /* check if four bytes are on the wire */ ND_PRINT((ndo, "\n\t Sequence number: %u", EXTRACT_32BITS(tptr))); break; case ISIS_TLV_VENDOR_PRIVATE: if (tmp < ISIS_TLV_VENDOR_PRIVATE_MINLEN) break; - if (!ND_TTEST2(*tptr, ISIS_TLV_VENDOR_PRIVATE_MINLEN)) /* check if enough byte for a full oui */ - goto trunctlv; + ND_TCHECK2(*tptr, ISIS_TLV_VENDOR_PRIVATE_MINLEN); /* check if enough byte for a full oui */ vendor_id = EXTRACT_24BITS(tptr); ND_PRINT((ndo, "\n\t Vendor: %s (%u)", tok2str(oui_values, "Unknown", vendor_id), @@ -3083,40 +3110,33 @@ isis_print(netdissect_options *ndo, return(1); } -static int +static void osi_print_cksum(netdissect_options *ndo, const uint8_t *pptr, - uint16_t checksum, int checksum_offset, int length) + uint16_t checksum, int checksum_offset, u_int length) { uint16_t calculated_checksum; /* do not attempt to verify the checksum if it is zero, - * if the total length is nonsense, * if the offset is nonsense, * or the base pointer is not sane */ if (!checksum - || length < 0 || checksum_offset < 0 - || length > ndo->ndo_snaplen - || checksum_offset > ndo->ndo_snaplen - || checksum_offset > length) { + || !ND_TTEST2(*(pptr + checksum_offset), 2) + || (u_int)checksum_offset > length + || !ND_TTEST2(*pptr, length)) { ND_PRINT((ndo, " (unverified)")); - return 1; } else { #if 0 - printf("\nosi_print_cksum: %p %u %u %u\n", pptr, checksum_offset, length, ndo->ndo_snaplen); + printf("\nosi_print_cksum: %p %u %u\n", pptr, checksum_offset, length); #endif - ND_TCHECK2(*pptr, length); calculated_checksum = create_osi_cksum(pptr, checksum_offset, length); if (checksum == calculated_checksum) { ND_PRINT((ndo, " (correct)")); } else { ND_PRINT((ndo, " (incorrect should be 0x%04x)", calculated_checksum)); } - return 1; } -trunc: - return 0; } /*