X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/810773f6e9b6b38b5727b1b8c65f73fcb2fb5515..a9a7c86c7875a38358a9ff1f2a35e93febf6f41e:/print-isoclns.c diff --git a/print-isoclns.c b/print-isoclns.c index 6df82300..ea58d8a3 100644 --- a/print-isoclns.c +++ b/print-isoclns.c @@ -26,7 +26,7 @@ #ifndef lint static const char rcsid[] _U_ = - "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.129 2005-03-09 18:42:51 hannes Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.165 2008-08-16 13:38:15 hannes Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -46,9 +46,7 @@ static const char rcsid[] _U_ = #include "extract.h" #include "gmpls.h" #include "oui.h" - -#define IPV4 1 /* AFI value */ -#define IPV6 2 /* AFI value */ +#include "signature.h" /* * IS-IS is defined in ISO 10589. Look there for protocol definitions. @@ -110,7 +108,9 @@ static struct tok isis_pdu_values[] = { #define ISIS_TLV_LSP 9 /* iso10589 */ #define ISIS_TLV_AUTH 10 /* iso10589, rfc3567 */ #define ISIS_TLV_CHECKSUM 12 /* rfc3358 */ +#define ISIS_TLV_CHECKSUM_MINLEN 2 #define ISIS_TLV_LSP_BUFFERSIZE 14 /* iso10589 rev2 */ +#define ISIS_TLV_LSP_BUFFERSIZE_MINLEN 2 #define ISIS_TLV_EXT_IS_REACH 22 /* draft-ietf-isis-traffic-05 */ #define ISIS_TLV_IS_ALIAS_ID 24 /* draft-ietf-isis-ext-lsp-frags-02 */ #define ISIS_TLV_DECNET_PHASE4 42 @@ -119,6 +119,7 @@ static struct tok isis_pdu_values[] = { #define ISIS_TLV_PROTOCOLS 129 /* rfc1195 */ #define ISIS_TLV_EXT_IP_REACH 130 /* rfc1195, rfc2966 */ #define ISIS_TLV_IDRP_INFO 131 /* rfc1195 */ +#define ISIS_TLV_IDRP_INFO_MINLEN 1 #define ISIS_TLV_IPADDR 132 /* rfc1195 */ #define ISIS_TLV_IPAUTH 133 /* rfc1195 */ #define ISIS_TLV_TE_ROUTER_ID 134 /* draft-ietf-isis-traffic-05 */ @@ -127,16 +128,21 @@ static struct tok isis_pdu_values[] = { #define ISIS_TLV_SHARED_RISK_GROUP 138 /* draft-ietf-isis-gmpls-extensions */ #define ISIS_TLV_NORTEL_PRIVATE1 176 #define ISIS_TLV_NORTEL_PRIVATE2 177 -#define ISIS_TLV_RESTART_SIGNALING 211 /* draft-ietf-isis-restart-01 */ +#define ISIS_TLV_RESTART_SIGNALING 211 /* rfc3847 */ +#define ISIS_TLV_RESTART_SIGNALING_FLAGLEN 1 +#define ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN 2 #define ISIS_TLV_MT_IS_REACH 222 /* draft-ietf-isis-wg-multi-topology-05 */ #define ISIS_TLV_MT_SUPPORTED 229 /* draft-ietf-isis-wg-multi-topology-05 */ +#define ISIS_TLV_MT_SUPPORTED_MINLEN 2 #define ISIS_TLV_IP6ADDR 232 /* draft-ietf-isis-ipv6-02 */ #define ISIS_TLV_MT_IP_REACH 235 /* draft-ietf-isis-wg-multi-topology-05 */ #define ISIS_TLV_IP6_REACH 236 /* draft-ietf-isis-ipv6-02 */ #define ISIS_TLV_MT_IP6_REACH 237 /* draft-ietf-isis-wg-multi-topology-05 */ #define ISIS_TLV_PTP_ADJ 240 /* rfc3373 */ #define ISIS_TLV_IIH_SEQNR 241 /* draft-shen-isis-iih-sequence-00 */ +#define ISIS_TLV_IIH_SEQNR_MINLEN 4 #define ISIS_TLV_VENDOR_PRIVATE 250 /* draft-ietf-isis-experimental-tlv-01 */ +#define ISIS_TLV_VENDOR_PRIVATE_MINLEN 3 static struct tok isis_tlv_values[] = { { ISIS_TLV_AREA_ADDR, "Area address(es)"}, @@ -201,27 +207,148 @@ static struct tok esis_option_values[] = { #define CLNP_OPTION_DISCARD_REASON 193 #define CLNP_OPTION_QOS_MAINTENANCE 195 /* iso8473 */ +#define CLNP_OPTION_SECURITY 197 /* iso8473 */ +#define CLNP_OPTION_SOURCE_ROUTING 200 /* iso8473 */ +#define CLNP_OPTION_ROUTE_RECORDING 203 /* iso8473 */ +#define CLNP_OPTION_PADDING 204 /* iso8473 */ #define CLNP_OPTION_PRIORITY 205 /* iso8473 */ static struct tok clnp_option_values[] = { { CLNP_OPTION_DISCARD_REASON, "Discard Reason"}, { CLNP_OPTION_PRIORITY, "Priority"}, { CLNP_OPTION_QOS_MAINTENANCE, "QoS Maintenance"}, + { CLNP_OPTION_SECURITY, "Security"}, + { CLNP_OPTION_SOURCE_ROUTING, "Source Routing"}, + { CLNP_OPTION_ROUTE_RECORDING, "Route Recording"}, + { CLNP_OPTION_PADDING, "Padding"}, + { 0, NULL } +}; + +static struct tok clnp_option_rfd_class_values[] = { + { 0x0, "General"}, + { 0x8, "Address"}, + { 0x9, "Source Routeing"}, + { 0xa, "Lifetime"}, + { 0xb, "PDU Discarded"}, + { 0xc, "Reassembly"}, + { 0, NULL } +}; + +static struct tok clnp_option_rfd_general_values[] = { + { 0x0, "Reason not specified"}, + { 0x1, "Protocol procedure error"}, + { 0x2, "Incorrect checksum"}, + { 0x3, "PDU discarded due to congestion"}, + { 0x4, "Header syntax error (cannot be parsed)"}, + { 0x5, "Segmentation needed but not permitted"}, + { 0x6, "Incomplete PDU received"}, + { 0x7, "Duplicate option"}, + { 0, NULL } +}; + +static struct tok clnp_option_rfd_address_values[] = { + { 0x0, "Destination address unreachable"}, + { 0x1, "Destination address unknown"}, + { 0, NULL } +}; + +static struct tok clnp_option_rfd_source_routeing_values[] = { + { 0x0, "Unspecified source routeing error"}, + { 0x1, "Syntax error in source routeing field"}, + { 0x2, "Unknown address in source routeing field"}, + { 0x3, "Path not acceptable"}, + { 0, NULL } +}; + +static struct tok clnp_option_rfd_lifetime_values[] = { + { 0x0, "Lifetime expired while data unit in transit"}, + { 0x1, "Lifetime expired during reassembly"}, + { 0, NULL } +}; + +static struct tok clnp_option_rfd_pdu_discard_values[] = { + { 0x0, "Unsupported option not specified"}, + { 0x1, "Unsupported protocol version"}, + { 0x2, "Unsupported security option"}, + { 0x3, "Unsupported source routeing option"}, + { 0x4, "Unsupported recording of route option"}, + { 0, NULL } +}; + +static struct tok clnp_option_rfd_reassembly_values[] = { + { 0x0, "Reassembly interference"}, + { 0, NULL } +}; + +/* array of 16 error-classes */ +static struct tok *clnp_option_rfd_error_class[] = { + clnp_option_rfd_general_values, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + clnp_option_rfd_address_values, + clnp_option_rfd_source_routeing_values, + clnp_option_rfd_lifetime_values, + clnp_option_rfd_pdu_discard_values, + clnp_option_rfd_reassembly_values, + NULL, + NULL, + NULL +}; + +#define CLNP_OPTION_OPTION_QOS_MASK 0x3f +#define CLNP_OPTION_SCOPE_MASK 0xc0 +#define CLNP_OPTION_SCOPE_SA_SPEC 0x40 +#define CLNP_OPTION_SCOPE_DA_SPEC 0x80 +#define CLNP_OPTION_SCOPE_GLOBAL 0xc0 + +static struct tok clnp_option_scope_values[] = { + { CLNP_OPTION_SCOPE_SA_SPEC, "Source Address Specific"}, + { CLNP_OPTION_SCOPE_DA_SPEC, "Destination Address Specific"}, + { CLNP_OPTION_SCOPE_GLOBAL, "Globally unique"}, + { 0, NULL } +}; + +static struct tok clnp_option_sr_rr_values[] = { + { 0x0, "partial"}, + { 0x1, "complete"}, + { 0, NULL } +}; + +static struct tok clnp_option_sr_rr_string_values[] = { + { CLNP_OPTION_SOURCE_ROUTING, "source routing"}, + { CLNP_OPTION_ROUTE_RECORDING, "recording of route in progress"}, + { 0, NULL } +}; + +static struct tok clnp_option_qos_global_values[] = { + { 0x20, "reserved"}, + { 0x10, "sequencing vs. delay"}, + { 0x08, "congested"}, + { 0x04, "delay vs. cost"}, + { 0x02, "error vs. delay"}, + { 0x01, "error vs. cost"}, { 0, NULL } }; #define ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* draft-ietf-isis-traffic-05 */ -#define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* draft-ietf-isis-gmpls-extensions */ +#define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* rfc4205 */ #define ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* draft-ietf-isis-traffic-05 */ #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* draft-ietf-isis-traffic-05 */ #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* draft-ietf-isis-traffic-05 */ #define ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* draft-ietf-isis-traffic-05 */ #define ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* draft-ietf-isis-traffic-05 */ -#define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* draft-ietf-isis-traffic-05 */ -#define ISIS_SUBTLV_EXT_IS_REACH_DIFFSERV_TE 12 /* draft-ietf-tewg-diff-te-proto-06 */ +#define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* rfc4124 */ +#define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD 12 /* draft-ietf-tewg-diff-te-proto-06 */ #define ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* draft-ietf-isis-traffic-05 */ -#define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* draft-ietf-isis-gmpls-extensions */ -#define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* draft-ietf-isis-gmpls-extensions */ +#define ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE 19 /* draft-ietf-isis-link-attr-01 */ +#define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* rfc4205 */ +#define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* rfc4205 */ +#define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS 22 /* rfc4124 */ static struct tok isis_ext_is_reach_subtlv_values[] = { { ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP, "Administrative groups" }, @@ -232,10 +359,12 @@ static struct tok isis_ext_is_reach_subtlv_values[] = { { ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW, "Maximum link bandwidth" }, { ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW, "Reservable link bandwidth" }, { ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW, "Unreserved bandwidth" }, - { ISIS_SUBTLV_EXT_IS_REACH_DIFFSERV_TE, "Diffserv TE" }, { ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC, "Traffic Engineering Metric" }, + { ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE, "Link Attribute" }, { ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE, "Link Protection Type" }, { ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR, "Interface Switching Capability" }, + { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD, "Bandwidth Constraints (old)" }, + { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS, "Bandwidth Constraints" }, { 250, "Reserved for cisco specific extensions" }, { 251, "Reserved for cisco specific extensions" }, { 252, "Reserved for cisco specific extensions" }, @@ -256,6 +385,13 @@ static struct tok isis_ext_ip_reach_subtlv_values[] = { { 0, NULL } }; +static struct tok isis_subtlv_link_attribute_values[] = { + { 0x01, "Local Protection Available" }, + { 0x02, "Link excluded from local protection path" }, + { 0x04, "Local maintenance required"}, + { 0, NULL } +}; + #define ISIS_SUBTLV_AUTH_SIMPLE 1 #define ISIS_SUBTLV_AUTH_MD5 54 #define ISIS_SUBTLV_AUTH_MD5_LEN 16 @@ -346,7 +482,7 @@ static struct tok isis_lsp_istype_values[] = { { ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"}, { ISIS_LSP_TYPE_LEVEL_1, "L1 IS"}, { ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"}, - { ISIS_LSP_TYPE_LEVEL_2, "L1L2 IS"}, + { ISIS_LSP_TYPE_LEVEL_2, "L2 IS"}, { 0, NULL } }; @@ -373,7 +509,8 @@ struct isis_tlv_ptp_adj { u_int8_t neighbor_extd_local_circuit_id[4]; }; -static int osi_cksum(const u_int8_t *, u_int); +static void osi_print_cksum(const u_int8_t *pptr, u_int16_t checksum, + u_int checksum_offset, u_int length); static int clnp_print(const u_int8_t *, u_int); static void esis_print(const u_int8_t *, u_int); static int isis_print(const u_int8_t *, u_int); @@ -410,6 +547,7 @@ static struct tok isis_is_reach_virtual_values[] = { static struct tok isis_restart_flag_values[] = { { 0x1, "Restart Request"}, { 0x2, "Restart Acknowledgement"}, + { 0x4, "Suppress adjacency advertisement"}, { 0, NULL } }; @@ -509,7 +647,9 @@ void isoclns_print(const u_int8_t *p, u_int length, u_int caplen) break; case NLPID_NULLNS: - (void)printf(", length: %u", length); + (void)printf("%slength: %u", + eflag ? "" : ", ", + length); break; case NLPID_Q933: @@ -517,7 +657,7 @@ void isoclns_print(const u_int8_t *p, u_int length, u_int caplen) break; case NLPID_IP: - ip_print(p+1, length-1); + ip_print(gndo, p+1, length-1); break; #ifdef INET6 @@ -533,7 +673,9 @@ void isoclns_print(const u_int8_t *p, u_int length, u_int caplen) default: if (!eflag) printf("OSI NLPID 0x%02x unknown",*p); - (void)printf(", length: %u", length); + (void)printf("%slength: %u", + eflag ? "" : ", ", + length); if (caplen > 1) print_unknown_data(p,"\n\t",caplen); break; @@ -579,9 +721,10 @@ struct clnp_segment_header_t { static int clnp_print (const u_int8_t *pptr, u_int length) { const u_int8_t *optr,*source_address,*dest_address; - u_int li,source_address_length,dest_address_length, clnp_pdu_type, clnp_flags; + u_int li,tlen,nsap_offset,source_address_length,dest_address_length, clnp_pdu_type, clnp_flags; const struct clnp_header_t *clnp_header; const struct clnp_segment_header_t *clnp_segment_header; + u_int8_t rfd_error_major,rfd_error_minor; clnp_header = (const struct clnp_header_t *) pptr; TCHECK(*clnp_header); @@ -630,7 +773,7 @@ static int clnp_print (const u_int8_t *pptr, u_int length) } printf("%slength %u",eflag ? "" : ", ",length); - printf("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x ", + printf("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x", tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type), clnp_header->length_indicator, clnp_header->version, @@ -639,10 +782,8 @@ static int clnp_print (const u_int8_t *pptr, u_int length) EXTRACT_16BITS(clnp_header->segment_length), EXTRACT_16BITS(clnp_header->cksum)); - /* do not attempt to verify the checksum if it is zero */ - if (EXTRACT_16BITS(clnp_header->cksum) == 0) - printf("(unverified)"); - else printf("(%s)", osi_cksum(optr, clnp_header->length_indicator) ? "incorrect" : "correct"); + osi_print_cksum(optr, EXTRACT_16BITS(clnp_header->cksum), 7, + clnp_header->length_indicator); printf("\n\tFlags [%s]", bittok2str(clnp_flag_values,"none",clnp_flags)); @@ -655,6 +796,7 @@ static int clnp_print (const u_int8_t *pptr, u_int length) if (clnp_flags & CLNP_SEGMENT_PART) { clnp_segment_header = (const struct clnp_segment_header_t *) pptr; + TCHECK(*clnp_segment_header); printf("\n\tData Unit ID: 0x%04x, Segment Offset: %u, Total PDU Length: %u", EXTRACT_16BITS(clnp_segment_header->data_unit_id), EXTRACT_16BITS(clnp_segment_header->segment_offset), @@ -668,8 +810,7 @@ static int clnp_print (const u_int8_t *pptr, u_int length) u_int op, opli; const u_int8_t *tptr; - if (snapend - pptr < 2) - return (0); + TCHECK2(*pptr, 2); if (li < 2) { printf(", bad opts/li"); return (0); @@ -677,15 +818,14 @@ static int clnp_print (const u_int8_t *pptr, u_int length) op = *pptr++; opli = *pptr++; li -= 2; + TCHECK2(*pptr, opli); if (opli > li) { printf(", opt (%d) too long", op); return (0); } li -= opli; tptr = pptr; - - if (snapend < pptr) - return(0); + tlen = opli; printf("\n\t %s Option #%u, length %u, value: ", tok2str(clnp_option_values,"Unknown",op), @@ -694,8 +834,74 @@ static int clnp_print (const u_int8_t *pptr, u_int length) switch (op) { + + case CLNP_OPTION_ROUTE_RECORDING: /* those two options share the format */ + case CLNP_OPTION_SOURCE_ROUTING: + printf("%s %s", + tok2str(clnp_option_sr_rr_values,"Unknown",*tptr), + tok2str(clnp_option_sr_rr_string_values,"Unknown Option %u",op)); + nsap_offset=*(tptr+1); + if (nsap_offset == 0) { + printf(" Bad NSAP offset (0)"); + break; + } + nsap_offset-=1; /* offset to nsap list */ + if (nsap_offset > tlen) { + printf(" Bad NSAP offset (past end of option)"); + break; + } + tptr+=nsap_offset; + tlen-=nsap_offset; + while (tlen > 0) { + source_address_length=*tptr; + if (tlen < source_address_length+1) { + printf("\n\t NSAP address goes past end of option"); + break; + } + if (source_address_length > 0) { + source_address=(tptr+1); + TCHECK2(*source_address, source_address_length); + printf("\n\t NSAP address (length %u): %s", + source_address_length, + isonsap_string(source_address, source_address_length)); + } + tlen-=source_address_length+1; + } + break; + case CLNP_OPTION_PRIORITY: - printf("%u", *tptr); + printf("0x%1x", *tptr&0x0f); + break; + + case CLNP_OPTION_QOS_MAINTENANCE: + printf("\n\t Format Code: %s", + tok2str(clnp_option_scope_values,"Reserved",*tptr&CLNP_OPTION_SCOPE_MASK)); + + if ((*tptr&CLNP_OPTION_SCOPE_MASK) == CLNP_OPTION_SCOPE_GLOBAL) + printf("\n\t QoS Flags [%s]", + bittok2str(clnp_option_qos_global_values, + "none", + *tptr&CLNP_OPTION_OPTION_QOS_MASK)); + break; + + case CLNP_OPTION_SECURITY: + printf("\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: + rfd_error_major = (*tptr&0xf0) >> 4; + rfd_error_minor = *tptr&0x0f; + printf("\n\t Class: %s Error (0x%01x), %s (0x%01x)", + tok2str(clnp_option_rfd_class_values,"Unknown",rfd_error_major), + rfd_error_major, + tok2str(clnp_option_rfd_error_class[rfd_error_major],"Unknown",rfd_error_minor), + rfd_error_minor); + break; + + case CLNP_OPTION_PADDING: + printf("padding data"); break; /* @@ -703,8 +909,6 @@ static int clnp_print (const u_int8_t *pptr, u_int length) * you are welcome to contribute code ;-) */ - case CLNP_OPTION_DISCARD_REASON: - default: print_unknown_data(tptr,"\n\t ",opli); break; @@ -716,24 +920,26 @@ static int clnp_print (const u_int8_t *pptr, u_int length) switch (clnp_pdu_type) { + case CLNP_PDU_ER: /* fall through */ case CLNP_PDU_ERP: + TCHECK(*pptr); if (*(pptr) == NLPID_CLNP) { - printf("\n\t-----request packet-----\n\t"); + printf("\n\t-----original packet-----\n\t"); /* FIXME recursion protection */ clnp_print(pptr, length-clnp_header->length_indicator); break; } - case CLNP_PDU_ER: case CLNP_PDU_DT: case CLNP_PDU_MD: case CLNP_PDU_ERQ: default: /* dump the PDU specific data */ - printf("\n\t undecoded non-header data, length %u",length-clnp_header->length_indicator); - print_unknown_data(pptr,"\n\t ",length-(pptr-optr)); - + if (length-(pptr-optr) > 0) { + printf("\n\t undecoded non-header data, length %u",length-clnp_header->length_indicator); + print_unknown_data(pptr,"\n\t ",length-(pptr-optr)); + } } return (1); @@ -785,6 +991,7 @@ esis_print(const u_int8_t *pptr, u_int length) } esis_header = (const struct esis_header_t *) pptr; + TCHECK(*esis_header); li = esis_header->length_indicator; optr = pptr; @@ -830,11 +1037,9 @@ esis_print(const u_int8_t *pptr, u_int length) esis_pdu_type); printf(", v: %u%s", esis_header->version, esis_header->version == ESIS_VERSION ? "" : "unsupported" ); - printf(", checksum: 0x%04x ", EXTRACT_16BITS(esis_header->cksum)); - /* do not attempt to verify the checksum if it is zero */ - if (EXTRACT_16BITS(esis_header->cksum) == 0) - printf("(unverified)"); - else printf("(%s)", osi_cksum(pptr, li) ? "incorrect" : "correct"); + printf(", checksum: 0x%04x", EXTRACT_16BITS(esis_header->cksum)); + + osi_print_cksum(pptr, EXTRACT_16BITS(esis_header->cksum), 7, li); printf(", holding time: %us, length indicator: %u",EXTRACT_16BITS(esis_header->holdtime),li); @@ -846,25 +1051,72 @@ esis_print(const u_int8_t *pptr, u_int length) switch (esis_pdu_type) { case ESIS_PDU_REDIRECT: { - const u_int8_t *dst, *snpa, *tptr; + const u_int8_t *dst, *snpa, *neta; + u_int dstl, snpal, netal; - dst = pptr; pptr += *pptr + 1; - if (pptr > snapend) + TCHECK(*pptr); + if (li < 1) { + printf(", bad redirect/li"); + return; + } + dstl = *pptr; + pptr++; + li--; + TCHECK2(*pptr, dstl); + if (li < dstl) { + printf(", bad redirect/li"); + return; + } + dst = pptr; + pptr += dstl; + li -= dstl; + printf("\n\t %s", isonsap_string(dst,dstl)); + + TCHECK(*pptr); + if (li < 1) { + printf(", bad redirect/li"); + return; + } + snpal = *pptr; + pptr++; + li--; + TCHECK2(*pptr, snpal); + if (li < snpal) { + printf(", bad redirect/li"); return; - printf("\n\t %s", isonsap_string(dst+1,*dst)); - snpa = pptr; pptr += *pptr + 1; - tptr = pptr; pptr += *pptr + 1; - if (pptr > snapend) + } + snpa = pptr; + pptr += snpal; + li -= snpal; + TCHECK(*pptr); + if (li < 1) { + printf(", bad redirect/li"); + return; + } + netal = *pptr; + pptr++; + TCHECK2(*pptr, netal); + if (li < netal) { + printf(", bad redirect/li"); return; + } + neta = pptr; + pptr += netal; + li -= netal; - if (tptr[0] == 0) - printf("\n\t %s", etheraddr_string(&snpa[1])); + if (netal == 0) + printf("\n\t %s", etheraddr_string(snpa)); else - printf("\n\t %s", isonsap_string(tptr+1,*tptr)); + printf("\n\t %s", isonsap_string(neta,netal)); break; } case ESIS_PDU_ESH: + TCHECK(*pptr); + if (li < 1) { + printf(", bad esh/li"); + return; + } source_address_number = *pptr; pptr++; li--; @@ -872,23 +1124,47 @@ esis_print(const u_int8_t *pptr, u_int length) printf("\n\t Number of Source Addresses: %u", source_address_number); while (source_address_number > 0) { + TCHECK(*pptr); + if (li < 1) { + printf(", bad esh/li"); + return; + } source_address_length = *pptr; + pptr++; + li--; + + TCHECK2(*pptr, source_address_length); + if (li < source_address_length) { + printf(", bad esh/li"); + return; + } printf("\n\t NET (length: %u): %s", source_address_length, - isonsap_string(pptr+1,source_address_length)); - - pptr += source_address_length+1; - li -= source_address_length+1; + isonsap_string(pptr,source_address_length)); + pptr += source_address_length; + li -= source_address_length; source_address_number--; } break; case ESIS_PDU_ISH: { + TCHECK(*pptr); + if (li < 1) { + printf(", bad ish/li"); + return; + } source_address_length = *pptr; - printf("\n\t NET (length: %u): %s", source_address_length, isonsap_string(pptr+1, source_address_length)); - pptr += source_address_length+1; - li -= source_address_length +1; + pptr++; + li--; + TCHECK2(*pptr, source_address_length); + if (li < source_address_length) { + printf(", bad ish/li"); + return; + } + printf("\n\t NET (length: %u): %s", source_address_length, isonsap_string(pptr, source_address_length)); + pptr += source_address_length; + li -= source_address_length; break; } @@ -905,8 +1181,7 @@ esis_print(const u_int8_t *pptr, u_int length) u_int op, opli; const u_int8_t *tptr; - if (snapend - pptr < 2) - return; + TCHECK2(*pptr, 2); if (li < 2) { printf(", bad opts/li"); return; @@ -921,9 +1196,6 @@ esis_print(const u_int8_t *pptr, u_int length) li -= opli; tptr = pptr; - if (snapend < pptr) - return; - printf("\n\t %s Option #%u, length %u, value: ", tok2str(esis_option_values,"Unknown",op), op, @@ -932,12 +1204,13 @@ esis_print(const u_int8_t *pptr, u_int length) switch (op) { case ESIS_OPTION_ES_CONF_TIME: + TCHECK2(*pptr, 2); printf("%us", EXTRACT_16BITS(tptr)); break; - case ESIS_OPTION_PROTOCOLS: while (opli>0) { + TCHECK(*pptr); printf("%s (0x%02x)", tok2str(nlpid_values, "unknown", @@ -969,6 +1242,8 @@ esis_print(const u_int8_t *pptr, u_int length) print_unknown_data(pptr,"\n\t ",opli); pptr += opli; } +trunc: + return; } /* shared routine for printing system, node and lsp-ids */ @@ -1137,9 +1412,9 @@ trunctlv: */ static int -isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) { +isis_print_is_reach_subtlv (const u_int8_t *tptr,u_int subt,u_int subl,const char *ident) { - int priority_level,bandwidth_constraint; + u_int te_class,priority_level,gmpls_switch_cap; union { /* int to float conversion buffer for several subTLVs */ float f; u_int32_t i; @@ -1163,13 +1438,13 @@ isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *i case ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID: if (subl >= 4) { printf(", 0x%08x", EXTRACT_32BITS(tptr)); - if (subl == 8) /* draft-ietf-isis-gmpls-extensions */ + if (subl == 8) /* rfc4205 */ printf(", 0x%08x", EXTRACT_32BITS(tptr+4)); } break; case ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR: case ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR: - if (subl >= 4) + if (subl >= sizeof(struct in_addr)) printf(", %s", ipaddr_string(tptr)); break; case ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW : @@ -1181,28 +1456,29 @@ isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *i break; case ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW : if (subl >= 32) { - for (priority_level = 0; priority_level < 8; priority_level++) { + for (te_class = 0; te_class < 8; te_class++) { bw.i = EXTRACT_32BITS(tptr); - printf("%s priority level %d: %.3f Mbps", + printf("%s TE-Class %u: %.3f Mbps", ident, - priority_level, + te_class, bw.f*8/1000000 ); tptr+=4; } } break; - case ISIS_SUBTLV_EXT_IS_REACH_DIFFSERV_TE: + case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS: /* fall through */ + case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD: printf("%sBandwidth Constraints Model ID: %s (%u)", ident, tok2str(diffserv_te_bc_values, "unknown", *tptr), *tptr); tptr++; /* decode BCs until the subTLV ends */ - for (bandwidth_constraint = 0; bandwidth_constraint < (subl-1)/4; bandwidth_constraint++) { + for (te_class = 0; te_class < (subl-1)/4; te_class++) { bw.i = EXTRACT_32BITS(tptr); - printf("%s Bandwidth constraint %d: %.3f Mbps", + printf("%s Bandwidth constraint CT%u: %.3f Mbps", ident, - bandwidth_constraint, + te_class, bw.f*8/1000000 ); tptr+=4; } @@ -1211,6 +1487,15 @@ isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *i if (subl >= 3) printf(", %u", EXTRACT_24BITS(tptr)); break; + case ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE: + if (subl == 2) { + printf(", [ %s ] (0x%04x)", + bittok2str(isis_subtlv_link_attribute_values, + "Unknown", + EXTRACT_16BITS(tptr)), + EXTRACT_16BITS(tptr)); + } + break; case ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE: if (subl >= 2) { printf(", %s, Priority %u", @@ -1220,9 +1505,10 @@ isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *i break; case ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR: if (subl >= 36) { + gmpls_switch_cap = *tptr; printf("%s Interface Switching Capability:%s", ident, - tok2str(gmpls_switch_cap_values, "Unknown", *(tptr))); + tok2str(gmpls_switch_cap_values, "Unknown", gmpls_switch_cap)); printf(", LSP Encoding: %s", tok2str(gmpls_encoding_values, "Unknown", *(tptr+1))); tptr+=4; @@ -1236,12 +1522,29 @@ isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *i tptr+=4; } subl-=36; - /* there is some optional stuff left to decode but this is as of yet - not specified so just lets hexdump what is left */ - if(subl>0){ - if(!print_unknown_data(tptr,"\n\t\t ", - subl-36)) + switch (gmpls_switch_cap) { + case GMPLS_PSC1: + case GMPLS_PSC2: + case GMPLS_PSC3: + case GMPLS_PSC4: + bw.i = EXTRACT_32BITS(tptr); + printf("%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f*8/1000000); + printf("%s Interface MTU: %u", ident, EXTRACT_16BITS(tptr+4)); + break; + case GMPLS_TSC: + bw.i = EXTRACT_32BITS(tptr); + printf("%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f*8/1000000); + printf("%s Indication %s", ident, + tok2str(gmpls_switch_cap_tsc_indication_values, "Unknown (%u)", *(tptr+4))); + break; + default: + /* there is some optional stuff left to decode but this is as of yet + not specified so just lets hexdump what is left */ + if(subl>0){ + if(!print_unknown_data(tptr,"\n\t\t ", + subl)) return(0); + } } } break; @@ -1343,7 +1646,11 @@ static int isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi) { char ident_buffer[20]; - u_int8_t prefix[16]; /* shared copy buffer for IPv4 and IPv6 prefixes */ +#ifdef INET6 + u_int8_t prefix[sizeof(struct in6_addr)]; /* shared copy buffer for IPv4 and IPv6 prefixes */ +#else + u_int8_t prefix[sizeof(struct in_addr)]; /* shared copy buffer for IPv4 prefixes */ +#endif u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen; if (!TTEST2(*tptr, 4)) @@ -1352,18 +1659,30 @@ isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi processed=4; tptr+=4; - if (afi == IPV4) { + if (afi == AF_INET) { if (!TTEST2(*tptr, 1)) /* fetch status byte */ return (0); status_byte=*(tptr++); bit_length = status_byte&0x3f; + if (bit_length > 32) { + printf("%sIPv4 prefix: bad bit length %u", + ident, + bit_length); + return (0); + } processed++; #ifdef INET6 - } else if (afi == IPV6) { + } else if (afi == AF_INET6) { if (!TTEST2(*tptr, 1)) /* fetch status & prefix_len byte */ return (0); status_byte=*(tptr++); bit_length=*(tptr++); + if (bit_length > 128) { + printf("%sIPv6 prefix: bad bit length %u", + ident, + bit_length); + return (0); + } processed+=2; #endif } else @@ -1373,18 +1692,18 @@ isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi if (!TTEST2(*tptr, byte_length)) return (0); - memset(prefix, 0, 16); /* clear the copy buffer */ + memset(prefix, 0, sizeof prefix); /* clear the copy buffer */ memcpy(prefix,tptr,byte_length); /* copy as much as is stored in the TLV */ tptr+=byte_length; processed+=byte_length; - if (afi == IPV4) + if (afi == AF_INET) printf("%sIPv4 prefix: %15s/%u", ident, ipaddr_string(prefix), bit_length); #ifdef INET6 - if (afi == IPV6) + if (afi == AF_INET6) printf("%sIPv6 prefix: %s/%u", ident, ip6addr_string(prefix), @@ -1395,17 +1714,20 @@ isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up", metric); - if (afi == IPV4 && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)) + if (afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)) printf(", sub-TLVs present"); #ifdef INET6 - if (afi == IPV6) + if (afi == AF_INET6) printf(", %s%s", ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal", ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : ""); #endif - if ((ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte) && afi == IPV4) || - (ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) && afi == IPV6)) { + if ((afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)) +#ifdef INET6 + || (afi == AF_INET6 && ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte)) +#endif + ) { /* assume that one prefix can hold more than one subTLV - therefore the first byte must reflect the aggregate bytecount of the subTLVs for this prefix @@ -1443,7 +1765,7 @@ static int isis_print (const u_int8_t *p, u_int length) const struct isis_iih_lan_header *header_iih_lan; const struct isis_iih_ptp_header *header_iih_ptp; - const struct isis_lsp_header *header_lsp; + struct isis_lsp_header *header_lsp; const struct isis_csnp_header *header_csnp; const struct isis_psnp_header *header_psnp; @@ -1457,16 +1779,18 @@ static int isis_print (const u_int8_t *p, u_int length) const u_int8_t *optr, *pptr, *tptr; u_short packet_len,pdu_len; u_int i,vendor_id; + int sigcheck; packet_len=length; optr = p; /* initialize the _o_riginal pointer to the packet start - - need it for parsing the checksum TLV */ + need it for parsing the checksum TLV and authentication + TLV verification */ isis_header = (const struct isis_common_header *)p; TCHECK(*isis_header); 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; - header_lsp = (const struct isis_lsp_header *)pptr; + header_lsp = (struct isis_lsp_header *)pptr; header_csnp = (const struct isis_csnp_header *)pptr; header_psnp = (const struct isis_psnp_header *)pptr; @@ -1688,15 +2012,18 @@ static int isis_print (const u_int8_t *p, u_int length) EXTRACT_16BITS(header_lsp->remaining_lifetime), EXTRACT_16BITS(header_lsp->checksum)); - /* if this is a purge do not attempt to verify the checksum */ - if ( EXTRACT_16BITS(header_lsp->remaining_lifetime) == 0 && - EXTRACT_16BITS(header_lsp->checksum) == 0) - printf(" (purged)"); - else - /* verify the checksum - - * checking starts at the lsp-id field at byte position [12] - * hence the length needs to be reduced by 12 bytes */ - printf(" (%s)", (osi_cksum((u_int8_t *)header_lsp->lsp_id, length-12)) ? "incorrect" : "correct"); + + osi_print_cksum((u_int8_t *)header_lsp->lsp_id, + EXTRACT_16BITS(header_lsp->checksum), 12, length-12); + + /* + * Clear checksum and lifetime prior to signature verification. + */ + header_lsp->checksum[0] = 0; + header_lsp->checksum[1] = 0; + header_lsp->remaining_lifetime[0] = 0; + header_lsp->remaining_lifetime[1] = 0; + printf(", PDU length: %u, Flags: [ %s", pdu_len, @@ -1818,6 +2145,9 @@ static int isis_print (const u_int8_t *p, u_int length) tlv_type, tlv_len); + if (tlv_len == 0) /* something is malformed */ + continue; + /* now check if we have a decoder otherwise do a hexdump at the end*/ switch (tlv_type) { case ISIS_TLV_AREA_ADDR: @@ -1848,9 +2178,13 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_ISNEIGH_VARLEN: - if (!TTEST2(*tptr, 1)) + if (!TTEST2(*tptr, 1) || tmp < 3) /* min. TLV length */ goto trunctlv; - lan_alen = *tptr++; /* LAN adress length */ + lan_alen = *tptr++; /* LAN address length */ + if (lan_alen == 0) { + printf("\n\t LAN address length 0 bytes (invalid)"); + break; + } tmp --; printf("\n\t LAN address length %u bytes ",lan_alen); while (tmp >= lan_alen) { @@ -1866,13 +2200,12 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_MT_IS_REACH: + mt_len = isis_print_mtid(tptr, "\n\t "); + if (mt_len == 0) /* did something go wrong ? */ + goto trunctlv; + tptr+=mt_len; + tmp-=mt_len; while (tmp >= 2+NODE_ID_LEN+3+1) { - mt_len = isis_print_mtid(tptr, "\n\t "); - if (mt_len == 0) /* did something go wrong ? */ - goto trunctlv; - tptr+=mt_len; - tmp-=mt_len; - ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type); if (ext_is_len == 0) /* did something go wrong ? */ goto trunctlv; @@ -1942,7 +2275,7 @@ static int isis_print (const u_int8_t *p, u_int length) case ISIS_TLV_EXTD_IP_REACH: while (tmp>0) { - ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV4); + ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunctlv; tptr+=ext_ip_len; @@ -1951,14 +2284,15 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_MT_IP_REACH: - while (tmp>0) { - mt_len = isis_print_mtid(tptr, "\n\t "); - if (mt_len == 0) /* did something go wrong ? */ - goto trunctlv; - tptr+=mt_len; - tmp-=mt_len; + mt_len = isis_print_mtid(tptr, "\n\t "); + if (mt_len == 0) { /* did something go wrong ? */ + goto trunctlv; + } + tptr+=mt_len; + tmp-=mt_len; - ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV4); + while (tmp>0) { + ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunctlv; tptr+=ext_ip_len; @@ -1969,7 +2303,7 @@ static int isis_print (const u_int8_t *p, u_int length) #ifdef INET6 case ISIS_TLV_IP6_REACH: while (tmp>0) { - ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6); + ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET6); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunctlv; tptr+=ext_ip_len; @@ -1978,14 +2312,15 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_MT_IP6_REACH: - while (tmp>0) { - mt_len = isis_print_mtid(tptr, "\n\t "); - if (mt_len == 0) /* did something go wrong ? */ - goto trunctlv; - tptr+=mt_len; - tmp-=mt_len; + mt_len = isis_print_mtid(tptr, "\n\t "); + if (mt_len == 0) { /* did something go wrong ? */ + goto trunctlv; + } + tptr+=mt_len; + tmp-=mt_len; - ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6); + while (tmp>0) { + ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET6); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunctlv; tptr+=ext_ip_len; @@ -1994,15 +2329,15 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_IP6ADDR: - while (tmp>0) { - if (!TTEST2(*tptr, 16)) + while (tmp>=sizeof(struct in6_addr)) { + if (!TTEST2(*tptr, sizeof(struct in6_addr))) goto trunctlv; printf("\n\t IPv6 interface address: %s", ip6addr_string(tptr)); - tptr += 16; - tmp -= 16; + tptr += sizeof(struct in6_addr); + tmp -= sizeof(struct in6_addr); } break; #endif @@ -2031,6 +2366,15 @@ static int isis_print (const u_int8_t *p, u_int length) } if (tlv_len != ISIS_SUBTLV_AUTH_MD5_LEN+1) printf(", (malformed subTLV) "); + +#ifdef HAVE_LIBCRYPTO + sigcheck = signature_verify(optr, length, + (unsigned char *)tptr + 1); +#else + sigcheck = CANT_CHECK_SIGNATURE; +#endif + printf(" (%s)", tok2str(signature_check_values, "Unknown", sigcheck)); + break; case ISIS_SUBTLV_AUTH_PRIVATE: default: @@ -2092,18 +2436,18 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_TE_ROUTER_ID: - if (!TTEST2(*pptr, 4)) + if (!TTEST2(*pptr, sizeof(struct in_addr))) goto trunctlv; printf("\n\t Traffic Engineering Router ID: %s", ipaddr_string(pptr)); break; case ISIS_TLV_IPADDR: - while (tmp>0) { - if (!TTEST2(*tptr, 4)) + while (tmp>=sizeof(struct in_addr)) { + if (!TTEST2(*tptr, sizeof(struct in_addr))) goto trunctlv; printf("\n\t IPv4 interface address: %s", ipaddr_string(tptr)); - tptr += 4; - tmp -= 4; + tptr += sizeof(struct in_addr); + tmp -= sizeof(struct in_addr); } break; @@ -2118,30 +2462,38 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_SHARED_RISK_GROUP: + if (tmp < NODE_ID_LEN) + break; if (!TTEST2(*tptr, NODE_ID_LEN)) goto trunctlv; printf("\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 (!TTEST2(*tptr, 1)) goto trunctlv; printf(", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered"); tmp--; - if (!TTEST2(*tptr,4)) + if (tmp < sizeof(struct in_addr)) + break; + if (!TTEST2(*tptr,sizeof(struct in_addr))) goto trunctlv; printf("\n\t IPv4 interface address: %s", ipaddr_string(tptr)); - tptr+=4; - tmp-=4; + tptr+=sizeof(struct in_addr); + tmp-=sizeof(struct in_addr); - if (!TTEST2(*tptr,4)) + if (tmp < sizeof(struct in_addr)) + break; + if (!TTEST2(*tptr,sizeof(struct in_addr))) goto trunctlv; printf("\n\t IPv4 neighbor address: %s", ipaddr_string(tptr)); - tptr+=4; - tmp-=4; + tptr+=sizeof(struct in_addr); + tmp-=sizeof(struct in_addr); - while (tmp>0) { + while (tmp>=4) { if (!TTEST2(*tptr, 4)) goto trunctlv; printf("\n\t Link-ID: 0x%08x", EXTRACT_32BITS(tptr)); @@ -2152,7 +2504,7 @@ static int isis_print (const u_int8_t *p, u_int length) case ISIS_TLV_LSP: tlv_lsp = (const struct isis_tlv_lsp *)tptr; - while(tmp>0) { + while(tmp>=sizeof(struct isis_tlv_lsp)) { if (!TTEST((tlv_lsp->lsp_id)[LSP_ID_LEN-1])) goto trunctlv; printf("\n\t lsp-id: %s", @@ -2172,7 +2524,9 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_CHECKSUM: - if (!TTEST2(*tptr, 2)) + if (tmp < ISIS_TLV_CHECKSUM_MINLEN) + break; + if (!TTEST2(*tptr, ISIS_TLV_CHECKSUM_MINLEN)) goto trunctlv; printf("\n\t checksum: 0x%04x ", EXTRACT_16BITS(tptr)); /* do not attempt to verify the checksum if it is zero @@ -2180,12 +2534,12 @@ static int isis_print (const u_int8_t *p, u_int length) * to avoid conflicts the checksum TLV is zeroed. * see rfc3358 for details */ - if (EXTRACT_16BITS(tptr) == 0) - printf("(unverified)"); - else printf("(%s)", osi_cksum(optr, length) ? "incorrect" : "correct"); + osi_print_cksum(optr, EXTRACT_16BITS(tptr), tptr-optr, length); break; case ISIS_TLV_MT_SUPPORTED: + if (tmp < ISIS_TLV_MT_SUPPORTED_MINLEN) + break; while (tmp>1) { /* length can only be a multiple of 2, otherwise there is something broken -> so decode down until length is 1 */ @@ -2203,16 +2557,41 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_RESTART_SIGNALING: - if (!TTEST2(*tptr, 3)) + /* first attempt to decode the flags */ + if (tmp < ISIS_TLV_RESTART_SIGNALING_FLAGLEN) + break; + if (!TTEST2(*tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN)) + goto trunctlv; + printf("\n\t Flags [%s]", + bittok2str(isis_restart_flag_values, "none", *tptr)); + tptr+=ISIS_TLV_RESTART_SIGNALING_FLAGLEN; + tmp-=ISIS_TLV_RESTART_SIGNALING_FLAGLEN; + + /* is there anything other than the flags field? */ + if (tmp == 0) + break; + + if (tmp < ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN) + break; + if (!TTEST2(*tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN)) goto trunctlv; - printf("\n\t Flags [%s], Remaining holding time %us", - bittok2str(isis_restart_flag_values, "none", *tptr), - EXTRACT_16BITS(tptr+1)); - tptr+=3; + + printf(", Remaining holding time %us", EXTRACT_16BITS(tptr)); + tptr+=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN; + tmp-=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN; + + /* is there an additional sysid field present ?*/ + if (tmp == SYSTEM_ID_LEN) { + if (!TTEST2(*tptr, SYSTEM_ID_LEN)) + goto trunctlv; + printf(", for %s",isis_print_id(tptr,SYSTEM_ID_LEN)); + } break; case ISIS_TLV_IDRP_INFO: - if (!TTEST2(*tptr, 1)) + if (tmp < ISIS_TLV_IDRP_INFO_MINLEN) + break; + if (!TTEST2(*tptr, ISIS_TLV_IDRP_INFO_MINLEN)) goto trunctlv; printf("\n\t Inter-Domain Information Type: %s", tok2str(isis_subtlv_idrp_values, @@ -2234,7 +2613,9 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_LSP_BUFFERSIZE: - if (!TTEST2(*tptr, 2)) + if (tmp < ISIS_TLV_LSP_BUFFERSIZE_MINLEN) + break; + if (!TTEST2(*tptr, ISIS_TLV_LSP_BUFFERSIZE_MINLEN)) goto trunctlv; printf("\n\t LSP Buffersize: %u",EXTRACT_16BITS(tptr)); break; @@ -2250,6 +2631,8 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_PREFIX_NEIGH: + if (tmp < sizeof(struct isis_metric_block)) + break; if (!TTEST2(*tptr, sizeof(struct isis_metric_block))) goto trunctlv; printf("\n\t Metric Block"); @@ -2261,7 +2644,13 @@ static int isis_print (const u_int8_t *p, u_int length) if (!TTEST2(*tptr, 1)) goto trunctlv; prefix_len=*tptr++; /* read out prefix length in semioctets*/ + if (prefix_len < 2) { + printf("\n\t\tAddress: prefix length %u < 2", prefix_len); + break; + } tmp--; + if (tmp < prefix_len/2) + break; if (!TTEST2(*tptr, prefix_len/2)) goto trunctlv; printf("\n\t\tAddress: %s/%u", @@ -2273,13 +2662,17 @@ static int isis_print (const u_int8_t *p, u_int length) break; case ISIS_TLV_IIH_SEQNR: - if (!TTEST2(*tptr, 4)) /* check if four bytes are on the wire */ + if (tmp < ISIS_TLV_IIH_SEQNR_MINLEN) + break; + if (!TTEST2(*tptr, ISIS_TLV_IIH_SEQNR_MINLEN)) /* check if four bytes are on the wire */ goto trunctlv; printf("\n\t Sequence number: %u", EXTRACT_32BITS(tptr) ); break; case ISIS_TLV_VENDOR_PRIVATE: - if (!TTEST2(*tptr, 3)) /* check if enough byte for a full oui */ + if (tmp < ISIS_TLV_VENDOR_PRIVATE_MINLEN) + break; + if (!TTEST2(*tptr, ISIS_TLV_VENDOR_PRIVATE_MINLEN)) /* check if enough byte for a full oui */ goto trunctlv; vendor_id = EXTRACT_24BITS(tptr); printf("\n\t Vendor: %s (%u)", @@ -2333,20 +2726,28 @@ static int isis_print (const u_int8_t *p, u_int length) return(1); } -/* - * Verify the checksum. See 8473-1, Appendix C, section C.4. - */ - -static int -osi_cksum(const u_int8_t *tptr, u_int len) +static void +osi_print_cksum (const u_int8_t *pptr, u_int16_t checksum, + u_int checksum_offset, u_int length) { - int32_t c0 = 0, c1 = 0; + u_int16_t calculated_checksum; - while ((int)--len >= 0) { - c0 += *tptr++; - c0 %= 255; - c1 += c0; - c1 %= 255; - } - return (c0 | c1); + /* do not attempt to verify the checksum if it is zero */ + if (!checksum) { + printf("(unverified)"); + } else { + calculated_checksum = create_osi_cksum(pptr, checksum_offset, length); + if (checksum == calculated_checksum) { + printf(" (correct)"); + } else { + printf(" (incorrect should be 0x%04x)", calculated_checksum); + } + } } + +/* + * Local Variables: + * c-style: whitesmith + * c-basic-offset: 8 + * End: + */