/* * Copyright (c) 1992, 1993, 1994, 1995, 1996 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Original code by Matt Thomas, Digital Equipment Corporation * * Extensively modified by Hannes Gredler (hannes@juniper.net) for more * complete IS-IS support. */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.106.2.5 2004/03/24 01:45:26 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "interface.h" #include "addrtoname.h" #include "ethertype.h" #include "ether.h" #include "extract.h" #include "gmpls.h" #define NLPID_CLNS 129 /* 0x81 */ #define NLPID_ESIS 130 /* 0x82 */ #define NLPID_ISIS 131 /* 0x83 */ #define NLPID_IP6 0x8e #define NLPID_IP 0xcc #define NLPID_NULLNS 0 #define IPV4 1 /* AFI value */ #define IPV6 2 /* AFI value */ /* * IS-IS is defined in ISO 10589. Look there for protocol definitions. */ #define SYSTEM_ID_LEN ETHER_ADDR_LEN #define NODE_ID_LEN SYSTEM_ID_LEN+1 #define LSP_ID_LEN SYSTEM_ID_LEN+2 #define ISIS_VERSION 1 #define PDU_TYPE_MASK 0x1F #define PRIORITY_MASK 0x7F #define L1_LAN_IIH 15 #define L2_LAN_IIH 16 #define PTP_IIH 17 #define L1_LSP 18 #define L2_LSP 20 #define L1_CSNP 24 #define L2_CSNP 25 #define L1_PSNP 26 #define L2_PSNP 27 static struct tok isis_pdu_values[] = { { L1_LAN_IIH, "L1 Lan IIH"}, { L2_LAN_IIH, "L2 Lan IIH"}, { PTP_IIH, "p2p IIH"}, { L1_LSP, "L1 LSP"}, { L2_LSP, "L2 LSP"}, { L1_CSNP, "L1 CSNP"}, { L2_CSNP, "L2 CSNP"}, { L1_PSNP, "L1 PSNP"}, { L2_PSNP, "L2 PSNP"}, { 0, NULL} }; /* * A TLV is a tuple of a type, length and a value and is normally used for * encoding information in all sorts of places. This is an enumeration of * the well known types. * * list taken from rfc3359 plus some memory from veterans ;-) */ #define TLV_AREA_ADDR 1 /* iso10589 */ #define TLV_IS_REACH 2 /* iso10589 */ #define TLV_ESNEIGH 3 /* iso10589 */ #define TLV_PART_DIS 4 /* iso10589 */ #define TLV_PREFIX_NEIGH 5 /* iso10589 */ #define TLV_ISNEIGH 6 /* iso10589 */ #define TLV_ISNEIGH_VARLEN 7 /* iso10589 */ #define TLV_PADDING 8 /* iso10589 */ #define TLV_LSP 9 /* iso10589 */ #define TLV_AUTH 10 /* iso10589, rfc3567 */ #define TLV_CHECKSUM 12 /* rfc3358 */ #define TLV_LSP_BUFFERSIZE 14 /* iso10589 rev2 */ #define TLV_EXT_IS_REACH 22 /* draft-ietf-isis-traffic-05 */ #define TLV_IS_ALIAS_ID 24 /* draft-ietf-isis-ext-lsp-frags-02 */ #define TLV_DECNET_PHASE4 42 #define TLV_LUCENT_PRIVATE 66 #define TLV_INT_IP_REACH 128 /* rfc1195, rfc2966 */ #define TLV_PROTOCOLS 129 /* rfc1195 */ #define TLV_EXT_IP_REACH 130 /* rfc1195, rfc2966 */ #define TLV_IDRP_INFO 131 /* rfc1195 */ #define TLV_IPADDR 132 /* rfc1195 */ #define TLV_IPAUTH 133 /* rfc1195 */ #define TLV_TE_ROUTER_ID 134 /* draft-ietf-isis-traffic-05 */ #define TLV_EXTD_IP_REACH 135 /* draft-ietf-isis-traffic-05 */ #define TLV_HOSTNAME 137 /* rfc2763 */ #define TLV_SHARED_RISK_GROUP 138 /* draft-ietf-isis-gmpls-extensions */ #define TLV_NORTEL_PRIVATE1 176 #define TLV_NORTEL_PRIVATE2 177 #define TLV_HOLDTIME 198 /* ES-IS */ #define TLV_RESTART_SIGNALING 211 /* draft-ietf-isis-restart-01 */ #define TLV_MT_IS_REACH 222 /* draft-ietf-isis-wg-multi-topology-05 */ #define TLV_MT_SUPPORTED 229 /* draft-ietf-isis-wg-multi-topology-05 */ #define TLV_IP6ADDR 232 /* draft-ietf-isis-ipv6-02 */ #define TLV_MT_IP_REACH 235 /* draft-ietf-isis-wg-multi-topology-05 */ #define TLV_IP6_REACH 236 /* draft-ietf-isis-ipv6-02 */ #define TLV_MT_IP6_REACH 237 /* draft-ietf-isis-wg-multi-topology-05 */ #define TLV_PTP_ADJ 240 /* rfc3373 */ #define TLV_IIH_SEQNR 241 /* draft-shen-isis-iih-sequence-00 */ #define TLV_VENDOR_PRIVATE 250 /* draft-ietf-isis-proprietary-tlv-00 */ static struct tok isis_tlv_values[] = { { TLV_AREA_ADDR, "Area address(es)"}, { TLV_IS_REACH, "IS Reachability"}, { TLV_ESNEIGH, "ES Neighbor(s)"}, { TLV_PART_DIS, "Partition DIS"}, { TLV_PREFIX_NEIGH, "Prefix Neighbors"}, { TLV_ISNEIGH, "IS Neighbor(s)"}, { TLV_ISNEIGH_VARLEN, "IS Neighbor(s) (variable length)"}, { TLV_PADDING, "Padding"}, { TLV_LSP, "LSP entries"}, { TLV_AUTH, "Authentication"}, { TLV_CHECKSUM, "Checksum"}, { TLV_LSP_BUFFERSIZE, "LSP Buffersize"}, { TLV_EXT_IS_REACH, "Extended IS Reachability"}, { TLV_IS_ALIAS_ID, "IS Alias ID"}, { TLV_DECNET_PHASE4, "DECnet Phase IV"}, { TLV_LUCENT_PRIVATE, "Lucent Proprietary"}, { TLV_INT_IP_REACH, "IPv4 Internal Reachability"}, { TLV_PROTOCOLS, "Protocols supported"}, { TLV_EXT_IP_REACH, "IPv4 External Reachability"}, { TLV_IDRP_INFO, "Inter-Domain Information Type"}, { TLV_IPADDR, "IPv4 Interface address(es)"}, { TLV_IPAUTH, "IPv4 authentication (deprecated)"}, { TLV_TE_ROUTER_ID, "Traffic Engineering Router ID"}, { TLV_EXTD_IP_REACH, "Extended IPv4 Reachability"}, { TLV_HOSTNAME, "Hostname"}, { TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"}, { TLV_NORTEL_PRIVATE1, "Nortel Proprietary"}, { TLV_NORTEL_PRIVATE2, "Nortel Proprietary"}, { TLV_HOLDTIME, "Holdtime"}, { TLV_RESTART_SIGNALING, "Restart Signaling"}, { TLV_MT_IS_REACH, "Multi Topology IS Reachability"}, { TLV_MT_SUPPORTED, "Multi Topology"}, { TLV_IP6ADDR, "IPv6 Interface address(es)"}, { TLV_MT_IP_REACH, "Multi-Topology IPv4 Reachability"}, { TLV_IP6_REACH, "IPv6 reachability"}, { TLV_MT_IP6_REACH, "Multi-Topology IP6 Reachability"}, { TLV_PTP_ADJ, "Point-to-point Adjacency State"}, { TLV_IIH_SEQNR, "Hello PDU Sequence Number"}, { TLV_VENDOR_PRIVATE, "Vendor Private"}, { 0, NULL } }; #define SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* draft-ietf-isis-traffic-05 */ #define SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* draft-ietf-isis-gmpls-extensions */ #define SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* draft-ietf-isis-traffic-05 */ #define SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* draft-ietf-isis-traffic-05 */ #define SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* draft-ietf-isis-traffic-05 */ #define SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* draft-ietf-isis-traffic-05 */ #define SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* draft-ietf-isis-traffic-05 */ #define SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* draft-ietf-isis-traffic-05 */ #define SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* draft-ietf-isis-traffic-05 */ #define SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* draft-ietf-isis-gmpls-extensions */ #define SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* draft-ietf-isis-gmpls-extensions */ static struct tok isis_ext_is_reach_subtlv_values[] = { { SUBTLV_EXT_IS_REACH_ADMIN_GROUP, "Administrative groups" }, { SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" }, { SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID, "Link Remote Identifier" }, { SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR, "IPv4 interface address" }, { SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR, "IPv4 neighbor address" }, { SUBTLV_EXT_IS_REACH_MAX_LINK_BW, "Maximum link bandwidth" }, { SUBTLV_EXT_IS_REACH_RESERVABLE_BW, "Reservable link bandwidth" }, { SUBTLV_EXT_IS_REACH_UNRESERVED_BW, "Unreserved bandwidth" }, { SUBTLV_EXT_IS_REACH_TE_METRIC, "Traffic Engineering Metric" }, { SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE, "Link Protection Type" }, { SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR, "Interface Switching Capability" }, { 250, "Reserved for cisco specific extensions" }, { 251, "Reserved for cisco specific extensions" }, { 252, "Reserved for cisco specific extensions" }, { 253, "Reserved for cisco specific extensions" }, { 254, "Reserved for cisco specific extensions" }, { 255, "Reserved for future expansion" }, { 0, NULL } }; #define SUBTLV_EXTD_IP_REACH_ADMIN_TAG32 1 #define SUBTLV_EXTD_IP_REACH_ADMIN_TAG64 2 static struct tok isis_ext_ip_reach_subtlv_values[] = { { SUBTLV_EXTD_IP_REACH_ADMIN_TAG32, "32-Bit Administrative tag" }, { SUBTLV_EXTD_IP_REACH_ADMIN_TAG64, "64-Bit Administrative tag" }, { 0, NULL } }; #define SUBTLV_AUTH_SIMPLE 1 #define SUBTLV_AUTH_MD5 54 #define SUBTLV_AUTH_MD5_LEN 16 #define SUBTLV_AUTH_PRIVATE 255 static struct tok isis_subtlv_auth_values[] = { { SUBTLV_AUTH_SIMPLE, "simple text password"}, { SUBTLV_AUTH_MD5, "HMAC-MD5 password"}, { SUBTLV_AUTH_PRIVATE, "Routing Domain private password"}, { 0, NULL } }; #define SUBTLV_IDRP_RES 0 #define SUBTLV_IDRP_LOCAL 1 #define SUBTLV_IDRP_ASN 2 static struct tok isis_subtlv_idrp_values[] = { { SUBTLV_IDRP_RES, "Reserved"}, { SUBTLV_IDRP_LOCAL, "Routing-Domain Specific"}, { SUBTLV_IDRP_ASN, "AS Number Tag"}, { 0, NULL} }; #define ISIS_8BIT_MASK(x) ((x)&0xff) #define ISIS_MASK_LSP_OL_BIT(x) ((x)&0x4) #define ISIS_MASK_LSP_ISTYPE_BITS(x) ((x)&0x3) #define ISIS_MASK_LSP_PARTITION_BIT(x) ((x)&0x80) #define ISIS_MASK_LSP_ATT_BITS(x) ((x)&0x78) #define ISIS_MASK_LSP_ATT_ERROR_BIT(x) ((x)&0x40) #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) ((x)&0x20) #define ISIS_MASK_LSP_ATT_DELAY_BIT(x) ((x)&0x10) #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) ((x)&0x8) #define ISIS_MASK_MTID(x) ((x)&0x0fff) #define ISIS_MASK_MTFLAGS(x) ((x)&0xf000) static struct tok isis_mt_flag_values[] = { { 0x4000, "sub-TLVs present"}, { 0x8000, "ATT bit set"}, { 0, NULL} }; #define ISIS_MASK_TLV_EXTD_IP_UPDOWN(x) ((x)&0x80) #define ISIS_MASK_TLV_EXTD_IP_SUBTLV(x) ((x)&0x40) #define ISIS_MASK_TLV_EXTD_IP6_IE(x) ((x)&0x40) #define ISIS_MASK_TLV_EXTD_IP6_SUBTLV(x) ((x)&0x20) #define ISIS_LSP_TLV_METRIC_SUPPORTED(x) ((x)&0x80) #define ISIS_LSP_TLV_METRIC_IE(x) ((x)&0x40) #define ISIS_LSP_TLV_METRIC_UPDOWN(x) ((x)&0x80) #define ISIS_LSP_TLV_METRIC_VALUE(x) ((x)&0x3f) #define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1) static struct tok isis_mt_values[] = { { 0, "IPv4 unicast"}, { 1, "In-Band Management"}, { 2, "IPv6 unicast"}, { 3, "Multicast"}, { 4095, "Development, Experimental or Proprietary"}, { 0, NULL } }; static struct tok isis_iih_circuit_type_values[] = { { 1, "Level 1 only"}, { 2, "Level 2 only"}, { 3, "Level 1, Level 2"}, { 0, NULL} }; #define ISIS_LSP_TYPE_UNUSED0 0 #define ISIS_LSP_TYPE_LEVEL_1 1 #define ISIS_LSP_TYPE_UNUSED2 2 #define ISIS_LSP_TYPE_LEVEL_2 3 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"}, { 0, NULL } }; static struct tok osi_nlpid_values[] = { { NLPID_CLNS, "CLNS"}, { NLPID_IP, "IPv4"}, { NLPID_IP6, "IPv6"}, { 0, NULL } }; /* * Katz's point to point adjacency TLV uses codes to tell us the state of * the remote adjacency. Enumerate them. */ #define ISIS_PTP_ADJ_UP 0 #define ISIS_PTP_ADJ_INIT 1 #define ISIS_PTP_ADJ_DOWN 2 static struct tok isis_ptp_adjancey_values[] = { { ISIS_PTP_ADJ_UP, "Up" }, { ISIS_PTP_ADJ_INIT, "Initializing" }, { ISIS_PTP_ADJ_DOWN, "Down" }, { 0, NULL} }; struct isis_tlv_ptp_adj { u_int8_t adjacency_state; u_int8_t extd_local_circuit_id[4]; u_int8_t neighbor_sysid[SYSTEM_ID_LEN]; u_int8_t neighbor_extd_local_circuit_id[4]; }; static int osi_cksum(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); struct isis_metric_block { u_int8_t metric_default; u_int8_t metric_delay; u_int8_t metric_expense; u_int8_t metric_error; }; struct isis_tlv_is_reach { struct isis_metric_block isis_metric_block; u_int8_t neighbor_nodeid[NODE_ID_LEN]; }; struct isis_tlv_es_reach { struct isis_metric_block isis_metric_block; u_int8_t neighbor_sysid[SYSTEM_ID_LEN]; }; struct isis_tlv_ip_reach { struct isis_metric_block isis_metric_block; u_int8_t prefix[4]; u_int8_t mask[4]; }; static struct tok isis_is_reach_virtual_values[] = { { 0, "IsNotVirtual"}, { 1, "IsVirtual"}, { 0, NULL } }; static struct tok isis_restart_flag_values[] = { { 0x1, "Restart Request"}, { 0x2, "Restart Acknowledgement"}, { 0, NULL } }; struct isis_common_header { u_int8_t nlpid; u_int8_t fixed_len; u_int8_t version; /* Protocol version */ u_int8_t id_length; u_int8_t pdu_type; /* 3 MSbits are reserved */ u_int8_t pdu_version; /* Packet format version */ u_int8_t reserved; u_int8_t max_area; }; struct isis_iih_lan_header { u_int8_t circuit_type; u_int8_t source_id[SYSTEM_ID_LEN]; u_int8_t holding_time[2]; u_int8_t pdu_len[2]; u_int8_t priority; u_int8_t lan_id[NODE_ID_LEN]; }; struct isis_iih_ptp_header { u_int8_t circuit_type; u_int8_t source_id[SYSTEM_ID_LEN]; u_int8_t holding_time[2]; u_int8_t pdu_len[2]; u_int8_t circuit_id; }; struct isis_lsp_header { u_int8_t pdu_len[2]; u_int8_t remaining_lifetime[2]; u_int8_t lsp_id[LSP_ID_LEN]; u_int8_t sequence_number[4]; u_int8_t checksum[2]; u_int8_t typeblock; }; struct isis_csnp_header { u_int8_t pdu_len[2]; u_int8_t source_id[NODE_ID_LEN]; u_int8_t start_lsp_id[LSP_ID_LEN]; u_int8_t end_lsp_id[LSP_ID_LEN]; }; struct isis_psnp_header { u_int8_t pdu_len[2]; u_int8_t source_id[NODE_ID_LEN]; }; struct isis_tlv_lsp { u_int8_t remaining_lifetime[2]; u_int8_t lsp_id[LSP_ID_LEN]; u_int8_t sequence_number[4]; u_int8_t checksum[2]; }; static char * print_nsap(register const u_int8_t *pptr, register int nsap_length) { int nsap_idx; static char nsap_ascii_output[sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx")]; char *junk_buf = nsap_ascii_output; if (nsap_length < 1 || nsap_length > 20) { snprintf(nsap_ascii_output, sizeof(nsap_ascii_output), "illegal length"); return (nsap_ascii_output); } for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) { if (!TTEST2(*pptr, 1)) return (0); snprintf(junk_buf, sizeof(nsap_ascii_output) - (junk_buf - nsap_ascii_output), "%02x", *pptr++); junk_buf += strlen(junk_buf); if (((nsap_idx & 1) == 0) && (nsap_idx + 1 < nsap_length)) { *junk_buf++ = '.'; } } *(junk_buf) = '\0'; return (nsap_ascii_output); } #define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header)) #define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header)) #define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header)) #define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header)) #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header)) #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header)) void isoclns_print(const u_int8_t *p, u_int length, u_int caplen) { const struct isis_common_header *header; header = (const struct isis_common_header *)p; printf("%sOSI", caplen < 1 ? "|" : ""); if (caplen < 1) /* enough bytes on the wire ? */ return; switch (*p) { case NLPID_CLNS: (void)printf(", CLNS, length %u", length); break; case NLPID_ESIS: esis_print(p, length); return; case NLPID_ISIS: if (!isis_print(p, length)) print_unknown_data(p,"\n\t",caplen); break; case NLPID_NULLNS: (void)printf(", ISO NULLNS, length: %u", length); break; default: (void)printf(", Unknown NLPID 0x%02x, length: %u", p[0], length); if (caplen > 1) print_unknown_data(p,"\n\t",caplen); break; } } #define ESIS_REDIRECT 6 #define ESIS_ESH 2 #define ESIS_ISH 4 static struct tok esis_values[] = { { ESIS_REDIRECT, "redirect"}, { ESIS_ESH, "ESH"}, { ESIS_ISH, "ISH"}, { 0, NULL } }; struct esis_hdr { u_int8_t version; u_int8_t reserved; u_int8_t type; u_int8_t tmo[2]; u_int8_t cksum[2]; }; static void esis_print(const u_int8_t *p, u_int length) { const u_int8_t *ep; u_int li; const struct esis_hdr *eh; if (length <= 2) { if (qflag) printf(" bad pkt!"); else printf(" no header at all!"); return; } li = p[1]; eh = (const struct esis_hdr *) &p[2]; ep = p + li; if (li > length) { if (qflag) printf(" bad pkt!"); else printf(" LI(%d) > PDU size (%d)!", li, length); return; } if (li < sizeof(struct esis_hdr) + 2) { if (qflag) printf(" bad pkt!"); else { printf(" too short for esis header %d:", li); while (--length != 0) printf("%02X", *p++); } return; } printf(", ES-IS, %s, length %u", tok2str(esis_values,"unknown type: %u",eh->type & 0x1f), length); if(vflag < 1) return; if (vflag && osi_cksum(p, li)) { printf(" bad cksum (got 0x%02x%02x)", eh->cksum[1], eh->cksum[0]); default_print(p, length); return; } if (eh->version != 1) { printf(" unsupported version %d", eh->version); return; } p += sizeof(*eh) + 2; li -= sizeof(*eh) + 2; /* protoid * li */ switch (eh->type & 0x1f) { case ESIS_REDIRECT: { const u_int8_t *dst, *snpa, *is; dst = p; p += *p + 1; if (p > snapend) return; printf("\n\t\t %s", isonsap_string(dst)); snpa = p; p += *p + 1; is = p; p += *p + 1; if (p > snapend) return; if (p > ep) { printf(" [bad li]"); return; } if (is[0] == 0) printf(" > %s", etheraddr_string(&snpa[1])); else printf(" > %s", isonsap_string(is)); li = ep - p; break; } case ESIS_ESH: break; case ESIS_ISH: { const u_int8_t *is; is = p; p += *p + 1; if (p > ep) { printf(" [bad li]"); return; } if (p > snapend) return; if (!qflag) printf("\n\tNET: %s", print_nsap(is+1,*is)); li = ep - p; break; } default: if (vflag <= 1) { if (p < snapend) print_unknown_data(p,"\n\t ",snapend-p); } return; } /* hexdump - FIXME ? */ if (vflag > 1) { if (p < snapend) print_unknown_data(p,"\n\t ",snapend-p); } if (vflag) while (p < ep && li) { u_int op, opli; const u_int8_t *q; if (snapend - p < 2) return; if (li < 2) { printf(", bad opts/li"); return; } op = *p++; opli = *p++; li -= 2; if (opli > li) { printf(", opt (%d) too long", op); return; } li -= opli; q = p; p += opli; if (snapend < p) return; if (op == TLV_HOLDTIME && opli == 2) { printf("\n\tholdtime: %us", EXTRACT_16BITS(q)); continue; } if (op == TLV_PROTOCOLS && opli >= 1) { printf("\n\t%s (length: %u): %s", tok2str(isis_tlv_values, "unknown", op), opli, tok2str(osi_nlpid_values,"Unknown 0x%02x",*q)); continue; } print_unknown_data(q,"\n\t ",opli); } } /* shared routine for printing system, node and lsp-ids */ static char * isis_print_id(const u_int8_t *cp, int id_len) { int i; static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")]; char *pos = id; for (i = 1; i <= SYSTEM_ID_LEN; i++) { snprintf(pos, sizeof(id) - (pos - id), "%02x", *cp++); pos += strlen(pos); if (i == 2 || i == 4) *pos++ = '.'; } if (id_len >= NODE_ID_LEN) { snprintf(pos, sizeof(id) - (pos - id), ".%02x", *cp++); pos += strlen(pos); } if (id_len == LSP_ID_LEN) snprintf(pos, sizeof(id) - (pos - id), "-%02x", *cp); return (id); } /* print the 4-byte metric block which is common found in the old-style TLVs */ static int isis_print_metric_block (const struct isis_metric_block *isis_metric_block) { printf(", Default Metric: %d, %s", ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default), ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal"); if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay)) printf("\n\t\t Delay Metric: %d, %s", ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay), ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal"); if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense)) printf("\n\t\t Expense Metric: %d, %s", ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense), ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal"); if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error)) printf("\n\t\t Error Metric: %d, %s", ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error), ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal"); return(1); /* everything is ok */ } static int isis_print_tlv_ip_reach (const u_int8_t *cp, const char *ident, int length) { int prefix_len; const struct isis_tlv_ip_reach *tlv_ip_reach; tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp; while (length > 0) { if ((size_t)length < sizeof(*tlv_ip_reach)) { printf("short IPv4 Reachability (%d vs %lu)", length, (unsigned long)sizeof(*tlv_ip_reach)); return (0); } if (!TTEST(*tlv_ip_reach)) return (0); prefix_len = mask2plen(EXTRACT_32BITS(tlv_ip_reach->mask)); if (prefix_len == -1) printf("%sIPv4 prefix: %s mask %s", ident, ipaddr_string((tlv_ip_reach->prefix)), ipaddr_string((tlv_ip_reach->mask))); else printf("%sIPv4 prefix: %15s/%u", ident, ipaddr_string((tlv_ip_reach->prefix)), prefix_len); printf(", Distribution: %s, Metric: %u, %s", ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up", ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default), ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal"); if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay)) printf("%s Delay Metric: %u, %s", ident, ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay), ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal"); if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense)) printf("%s Expense Metric: %u, %s", ident, ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense), ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal"); if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error)) printf("%s Error Metric: %u, %s", ident, ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error), ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal"); length -= sizeof(struct isis_tlv_ip_reach); tlv_ip_reach++; } return (1); } /* * this is the common IP-REACH subTLV decoder it is called * from various EXTD-IP REACH TLVs (135,235,236,237) */ static int isis_print_ip_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) { /* first lets see if we know the subTLVs name*/ printf("%s%s subTLV #%u, length: %u", ident, tok2str(isis_ext_ip_reach_subtlv_values, "unknown", subt), subt, subl); if (!TTEST2(*tptr,subl)) goto trunctlv; switch(subt) { case SUBTLV_EXTD_IP_REACH_ADMIN_TAG32: while (subl >= 4) { printf(", 0x%08x (=%u)", EXTRACT_32BITS(tptr), EXTRACT_32BITS(tptr)); tptr+=4; subl-=4; } break; case SUBTLV_EXTD_IP_REACH_ADMIN_TAG64: while (subl >= 8) { printf(", 0x%08x%08x", EXTRACT_32BITS(tptr), EXTRACT_32BITS(tptr+4)); tptr+=8; subl-=8; } break; default: if(!print_unknown_data(tptr,"\n\t\t ", subl)) return(0); break; } return(1); trunctlv: printf("%spacket exceeded snapshot",ident); return(0); } /* * this is the common IS-REACH subTLV decoder it is called * from isis_print_ext_is_reach() */ static int isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) { int priority_level; union { /* int to float conversion buffer for several subTLVs */ float f; u_int32_t i; } bw; /* first lets see if we know the subTLVs name*/ printf("%s%s subTLV #%u, length: %u", ident, tok2str(isis_ext_is_reach_subtlv_values, "unknown", subt), subt, subl); if (!TTEST2(*tptr,subl)) goto trunctlv; switch(subt) { case SUBTLV_EXT_IS_REACH_ADMIN_GROUP: case SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID: case SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID: if (subl >= 4) { printf(", 0x%08x", EXTRACT_32BITS(tptr)); if (subl == 8) /* draft-ietf-isis-gmpls-extensions */ printf(", 0x%08x", EXTRACT_32BITS(tptr+4)); } break; case SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR: case SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR: if (subl >= 4) printf(", %s", ipaddr_string(tptr)); break; case SUBTLV_EXT_IS_REACH_MAX_LINK_BW : case SUBTLV_EXT_IS_REACH_RESERVABLE_BW: if (subl >= 4) { bw.i = EXTRACT_32BITS(tptr); printf(", %.3f Mbps", bw.f*8/1000000 ); } break; case SUBTLV_EXT_IS_REACH_UNRESERVED_BW : if (subl >= 32) { for (priority_level = 0; priority_level < 8; priority_level++) { bw.i = EXTRACT_32BITS(tptr); printf("%s priority level %d: %.3f Mbps", ident, priority_level, bw.f*8/1000000 ); tptr+=4; } } break; case SUBTLV_EXT_IS_REACH_TE_METRIC: if (subl >= 3) printf(", %u", EXTRACT_24BITS(tptr)); break; case SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE: if (subl >= 2) { printf(", %s, Priority %u", bittok2str(gmpls_link_prot_values, "none", *tptr), *(tptr+1)); } break; case SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR: if (subl >= 36) { printf("%s Interface Switching Capability:%s", ident, tok2str(gmpls_switch_cap_values, "Unknown", *(tptr))); printf(", LSP Encoding: %s", tok2str(gmpls_encoding_values, "Unknown", *(tptr+1))); tptr+=4; printf("%s Max LSP Bandwidth:",ident); for (priority_level = 0; priority_level < 8; priority_level++) { bw.i = EXTRACT_32BITS(tptr); printf("%s priority level %d: %.3f Mbps", ident, priority_level, bw.f*8/1000000 ); 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)) return(0); } } break; default: if(!print_unknown_data(tptr,"\n\t\t ", subl)) return(0); break; } return(1); trunctlv: printf("%spacket exceeded snapshot",ident); return(0); } /* * this is the common IS-REACH decoder it is called * from various EXTD-IS REACH style TLVs (22,24,222) */ static int isis_print_ext_is_reach (const u_int8_t *tptr,const char *ident, int tlv_type) { char ident_buffer[20]; int subtlv_type,subtlv_len,subtlv_sum_len; int proc_bytes = 0; /* how many bytes did we process ? */ if (!TTEST2(*tptr, NODE_ID_LEN)) return(0); printf("%sIS Neighbor: %s", ident, isis_print_id(tptr, NODE_ID_LEN)); tptr+=(NODE_ID_LEN); if (tlv_type != TLV_IS_ALIAS_ID) { /* the Alias TLV Metric field is implicit 0 */ if (!TTEST2(*tptr, 3)) /* and is therefore skipped */ return(0); printf(", Metric: %d",EXTRACT_24BITS(tptr)); tptr+=3; } if (!TTEST2(*tptr, 1)) return(0); subtlv_sum_len=*(tptr++); /* read out subTLV length */ proc_bytes=NODE_ID_LEN+3+1; printf(", %ssub-TLVs present",subtlv_sum_len ? "" : "no "); if (subtlv_sum_len) { printf(" (%u)",subtlv_sum_len); while (subtlv_sum_len>0) { if (!TTEST2(*tptr,2)) return(0); subtlv_type=*(tptr++); subtlv_len=*(tptr++); /* prepend the ident string */ snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident); if(!isis_print_is_reach_subtlv(tptr,subtlv_type,subtlv_len,ident_buffer)) return(0); tptr+=subtlv_len; subtlv_sum_len-=(subtlv_len+2); proc_bytes+=(subtlv_len+2); } } return(proc_bytes); } /* * this is the common Multi Topology ID decoder * it is called from various MT-TLVs (222,229,235,237) */ static int isis_print_mtid (const u_int8_t *tptr,const char *ident) { if (!TTEST2(*tptr, 2)) return(0); printf("%s%s", ident, tok2str(isis_mt_values, "Reserved for IETF Consensus", ISIS_MASK_MTID(EXTRACT_16BITS(tptr)))); printf(" Topology (0x%03x), Flags: [%s]", ISIS_MASK_MTID(EXTRACT_16BITS(tptr)), bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(EXTRACT_16BITS(tptr)))); return(2); } /* * this is the common extended IP reach decoder * it is called from TLVs (135,235,236,237) * we process the TLV and optional subTLVs and return * the amount of processed bytes */ 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 */ u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen; if (!TTEST2(*tptr, 4)) return (0); metric = EXTRACT_32BITS(tptr); processed=4; tptr+=4; if (afi == IPV4) { if (!TTEST2(*tptr, 1)) /* fetch status byte */ return (0); status_byte=*(tptr++); bit_length = status_byte&0x3f; processed++; #ifdef INET6 } else if (afi == IPV6) { if (!TTEST2(*tptr, 1)) /* fetch status & prefix_len byte */ return (0); status_byte=*(tptr++); bit_length=*(tptr++); processed+=2; #endif } else return (0); /* somebody is fooling us */ byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */ if (!TTEST2(*tptr, byte_length)) return (0); memset(prefix, 0, 16); /* 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) printf("%sIPv4 prefix: %15s/%u", ident, ipaddr_string(prefix), bit_length); #ifdef INET6 if (afi == IPV6) printf("%sIPv6 prefix: %s/%u", ident, ip6addr_string(prefix), bit_length); #endif printf(", Distribution: %s, Metric: %u", ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up", metric); if (afi == IPV4 && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)) printf(", sub-TLVs present"); #ifdef INET6 if (afi == IPV6) 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)) { /* 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 */ if (!TTEST2(*tptr, 1)) return (0); sublen=*(tptr++); processed+=sublen+1; printf(" (%u)",sublen); /* print out subTLV length */ while (sublen>0) { if (!TTEST2(*tptr,2)) return (0); subtlvtype=*(tptr++); subtlvlen=*(tptr++); /* prepend the ident string */ snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident); if(!isis_print_ip_reach_subtlv(tptr,subtlvtype,subtlvlen,ident_buffer)) return(0); tptr+=subtlvlen; sublen-=(subtlvlen+2); } } return (processed); } /* * isis_print * Decode IS-IS packets. Return 0 on error. */ static int isis_print (const u_int8_t *p, u_int length) { const struct isis_common_header *header; 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; const struct isis_csnp_header *header_csnp; const struct isis_psnp_header *header_psnp; const struct isis_tlv_lsp *tlv_lsp; const struct isis_tlv_ptp_adj *tlv_ptp_adj; const struct isis_tlv_is_reach *tlv_is_reach; const struct isis_tlv_es_reach *tlv_es_reach; u_int8_t pdu_type, max_area, id_length, tlv_type, tlv_len, tmp, alen, lan_alen, prefix_len; u_int8_t ext_is_len, ext_ip_len, mt_len; const u_int8_t *optr, *pptr, *tptr; u_short packet_len,pdu_len; u_int i; packet_len=length; optr = p; /* initialize the _o_riginal pointer to the packet start - need it for parsing the checksum TLV */ header = (const struct isis_common_header *)p; TCHECK(*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_csnp = (const struct isis_csnp_header *)pptr; header_psnp = (const struct isis_psnp_header *)pptr; /* * Sanity checking of the header. */ if (header->version != ISIS_VERSION) { printf(", version %d packet not supported", header->version); return (0); } if ((header->id_length != SYSTEM_ID_LEN) && (header->id_length != 0)) { printf(", system ID length of %d is not supported", header->id_length); return (0); } if (header->pdu_version != ISIS_VERSION) { printf(", version %d packet not supported", header->pdu_version); return (0); } max_area = header->max_area; switch(max_area) { case 0: max_area = 3; /* silly shit */ break; case 255: printf(", bad packet -- 255 areas"); return (0); default: break; } id_length = header->id_length; switch(id_length) { case 0: id_length = 6; /* silly shit again */ break; case 1: /* 1-8 are valid sys-ID lenghts */ case 2: case 3: case 4: case 5: case 6: case 7: case 8: break; case 255: id_length = 0; /* entirely useless */ break; default: break; } /* toss any non 6-byte sys-ID len PDUs */ if (id_length != 6 ) { printf(", bad packet -- illegal sys-ID length (%u)", id_length); return (0); } pdu_type=header->pdu_type; /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/ if (vflag < 1) { printf(", IS-IS, %s", tok2str(isis_pdu_values,"unknown PDU-Type %u",pdu_type)); switch (pdu_type) { case L1_LAN_IIH: case L2_LAN_IIH: printf(", src-id %s", isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN)); printf(", lan-id %s, prio %u", isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN), header_iih_lan->priority); break; case PTP_IIH: printf(", src-id %s", isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN)); break; case L1_LSP: case L2_LSP: printf(", 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 L1_CSNP: case L2_CSNP: printf(", src-id %s", isis_print_id(header_csnp->source_id,SYSTEM_ID_LEN)); break; case L1_PSNP: case L2_PSNP: printf(", src-id %s", isis_print_id(header_psnp->source_id,SYSTEM_ID_LEN)); break; } printf(", length %u", length); return(1); } /* ok they seem to want to know everything - lets fully decode it */ printf(", IS-IS, length: %u",length); printf("\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), header->fixed_len, header->version, header->pdu_version, id_length, header->id_length, max_area, header->max_area); if (vflag > 1) { if(!print_unknown_data(optr,"\n\t",8)) /* provide the _o_riginal pointer */ return(0); /* for optionally debugging the common header */ } switch (pdu_type) { case L1_LAN_IIH: case L2_LAN_IIH: if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) { printf(", bogus fixed header length %u should be %lu", header->fixed_len, (unsigned long)ISIS_IIH_LAN_HEADER_SIZE); return (0); } 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; } TCHECK(*header_iih_lan); printf("\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)); printf("\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) & PRIORITY_MASK, pdu_len); if (vflag > 1) { if(!print_unknown_data(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; case PTP_IIH: if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) { printf(", bogus fixed header length %u should be %lu", header->fixed_len, (unsigned long)ISIS_IIH_PTP_HEADER_SIZE); return (0); } 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; } TCHECK(*header_iih_ptp); printf("\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)); printf("\n\t circuit-id: 0x%02x, PDU length: %u", header_iih_ptp->circuit_id, pdu_len); if (vflag > 1) { if(!print_unknown_data(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; case L1_LSP: case L2_LSP: if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) { printf(", bogus fixed header length %u should be %lu", header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE); return (0); } 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; } TCHECK(*header_lsp); printf("\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 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"); printf(", 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)) { printf("%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : ""); printf("%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : ""); printf("%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : ""); printf("%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : ""); printf("ATT bit set, "); } printf("%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : ""); printf("%s ]", tok2str(isis_lsp_istype_values,"Unknown(0x%x)",ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock))); if (vflag > 1) { if(!print_unknown_data(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; case L1_CSNP: case L2_CSNP: if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) { printf(", bogus fixed header length %u should be %lu", header->fixed_len, (unsigned long)ISIS_CSNP_HEADER_SIZE); return (0); } 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; } TCHECK(*header_csnp); printf("\n\t source-id: %s, PDU length: %u", isis_print_id(header_csnp->source_id, NODE_ID_LEN), pdu_len); printf("\n\t start lsp-id: %s", isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN)); printf("\n\t end lsp-id: %s", isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN)); if (vflag > 1) { if(!print_unknown_data(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); break; case L1_PSNP: case L2_PSNP: if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) { printf("- bogus fixed header length %u should be %lu", header->fixed_len, (unsigned long)ISIS_PSNP_HEADER_SIZE); return (0); } 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; } TCHECK(*header_psnp); printf("\n\t source-id: %s, PDU length: %u", isis_print_id(header_psnp->source_id, NODE_ID_LEN), pdu_len); if (vflag > 1) { if(!print_unknown_data(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; default: if(!print_unknown_data(pptr,"\n\t ",length)) return(0); return (0); } /* * Now print the TLV's. */ while (packet_len >= 2) { if (pptr == snapend) { return (1); } if (!TTEST2(*pptr, 2)) { printf("\n\t\t packet exceeded snapshot (%ld) bytes", (long)(pptr-snapend)); return (1); } 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*/ printf("\n\t %s TLV #%u, length: %u", tok2str(isis_tlv_values, "unknown", tlv_type), tlv_type, tlv_len); /* now check if we have a decoder otherwise do a hexdump at the end*/ switch (tlv_type) { case TLV_AREA_ADDR: if (!TTEST2(*tptr, 1)) goto trunctlv; alen = *tptr++; while (tmp && alen < tmp) { printf("\n\t Area address (length: %u): %s", alen, print_nsap(tptr, alen)); tptr += alen; tmp -= alen + 1; if (tmp==0) /* if this is the last area address do not attemt a boundary check */ break; if (!TTEST2(*tptr, 1)) goto trunctlv; alen = *tptr++; } break; case TLV_ISNEIGH: while (tmp >= ETHER_ADDR_LEN) { if (!TTEST2(*tptr, ETHER_ADDR_LEN)) goto trunctlv; printf("\n\t SNPA: %s",isis_print_id(tptr,ETHER_ADDR_LEN)); tmp -= ETHER_ADDR_LEN; tptr += ETHER_ADDR_LEN; } break; case TLV_ISNEIGH_VARLEN: if (!TTEST2(*tptr, 1)) goto trunctlv; lan_alen = *tptr++; /* LAN adress length */ tmp --; printf("\n\t LAN address length %u bytes ",lan_alen); while (tmp >= lan_alen) { if (!TTEST2(*tptr, lan_alen)) goto trunctlv; printf("\n\t\tIS Neighbor: %s",isis_print_id(tptr,lan_alen)); tmp -= lan_alen; tptr +=lan_alen; } break; case TLV_PADDING: break; case TLV_MT_IS_REACH: 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; tmp-=ext_is_len; tptr+=ext_is_len; } break; case TLV_IS_ALIAS_ID: while (tmp >= NODE_ID_LEN+1) { /* is it worth attempting a decode ? */ ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type); if (ext_is_len == 0) /* did something go wrong ? */ goto trunctlv; tmp-=ext_is_len; tptr+=ext_is_len; } break; case TLV_EXT_IS_REACH: while (tmp >= NODE_ID_LEN+3+1) { /* is it worth attempting a decode ? */ ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type); if (ext_is_len == 0) /* did something go wrong ? */ goto trunctlv; tmp-=ext_is_len; tptr+=ext_is_len; } break; case TLV_IS_REACH: if (!TTEST2(*tptr,1)) /* check if there is one byte left to read out the virtual flag */ goto trunctlv; printf("\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 (!TTEST(*tlv_is_reach)) goto trunctlv; printf("\n\t IS Neighbor: %s", isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN)); isis_print_metric_block(&tlv_is_reach->isis_metric_block); tmp -= sizeof(struct isis_tlv_is_reach); tlv_is_reach++; } break; case TLV_ESNEIGH: tlv_es_reach = (const struct isis_tlv_es_reach *)tptr; while (tmp >= sizeof(struct isis_tlv_es_reach)) { if (!TTEST(*tlv_es_reach)) goto trunctlv; printf("\n\t ES Neighbor: %s", isis_print_id(tlv_es_reach->neighbor_sysid,SYSTEM_ID_LEN)); isis_print_metric_block(&tlv_es_reach->isis_metric_block); tmp -= sizeof(struct isis_tlv_es_reach); tlv_es_reach++; } break; /* those two TLVs share the same format */ case TLV_INT_IP_REACH: case TLV_EXT_IP_REACH: if (!isis_print_tlv_ip_reach(pptr, "\n\t ", tlv_len)) return (1); break; case TLV_EXTD_IP_REACH: while (tmp>0) { ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV4); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunctlv; tptr+=ext_ip_len; tmp-=ext_ip_len; } break; case 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; ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV4); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunctlv; tptr+=ext_ip_len; tmp-=ext_ip_len; } break; #ifdef INET6 case TLV_IP6_REACH: while (tmp>0) { ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunctlv; tptr+=ext_ip_len; tmp-=ext_ip_len; } break; case 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; ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunctlv; tptr+=ext_ip_len; tmp-=ext_ip_len; } break; case TLV_IP6ADDR: while (tmp>0) { if (!TTEST2(*tptr, 16)) goto trunctlv; printf("\n\t IPv6 interface address: %s", ip6addr_string(tptr)); tptr += 16; tmp -= 16; } break; #endif case TLV_AUTH: if (!TTEST2(*tptr, 1)) goto trunctlv; printf("\n\t %s: ", tok2str(isis_subtlv_auth_values, "unknown Authentication type 0x%02x", *tptr)); switch (*tptr) { case SUBTLV_AUTH_SIMPLE: for(i=1;i=1) { if (!TTEST2(*tptr, 1)) goto trunctlv; printf("\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 (!TTEST2(tlv_ptp_adj->extd_local_circuit_id, sizeof(tlv_ptp_adj->extd_local_circuit_id))) goto trunctlv; printf("\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 (!TTEST2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN)) goto trunctlv; printf("\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 (!TTEST2(tlv_ptp_adj->neighbor_extd_local_circuit_id, sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id))) goto trunctlv; printf("\n\t Neighbor Extended Local circuit-ID: 0x%08x", EXTRACT_32BITS(tlv_ptp_adj->neighbor_extd_local_circuit_id)); } break; case TLV_PROTOCOLS: printf("\n\t NLPID(s): "); while (tmp>0) { if (!TTEST2(*(tptr), 1)) goto trunctlv; printf("%s (0x%02x)", tok2str(osi_nlpid_values, "unknown", *tptr), *tptr); if (tmp>1) /* further NPLIDs ? - put comma */ printf(", "); tptr++; tmp--; } break; case TLV_TE_ROUTER_ID: if (!TTEST2(*pptr, 4)) goto trunctlv; printf("\n\t Traffic Engineering Router ID: %s", ipaddr_string(pptr)); break; case TLV_IPADDR: while (tmp>0) { if (!TTEST2(*tptr, 4)) goto trunctlv; printf("\n\t IPv4 interface address: %s", ipaddr_string(tptr)); tptr += 4; tmp -= 4; } break; case TLV_HOSTNAME: printf("\n\t Hostname: "); while (tmp>0) { if (!TTEST2(*tptr, 1)) goto trunctlv; printf("%c",*tptr++); tmp--; } break; case TLV_SHARED_RISK_GROUP: 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 (!TTEST2(*tptr, 1)) goto trunctlv; printf(", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered"); tmp--; if (!TTEST2(*tptr,4)) goto trunctlv; printf("\n\t IPv4 interface address: %s", ipaddr_string(tptr)); tptr+=4; tmp-=4; if (!TTEST2(*tptr,4)) goto trunctlv; printf("\n\t IPv4 neighbor address: %s", ipaddr_string(tptr)); tptr+=4; tmp-=4; while (tmp>0) { if (!TTEST2(*tptr, 4)) goto trunctlv; printf("\n\t Link-ID: 0x%08x", EXTRACT_32BITS(tptr)); tptr+=4; tmp-=4; } break; case TLV_LSP: tlv_lsp = (const struct isis_tlv_lsp *)tptr; while(tmp>0) { if (!TTEST((tlv_lsp->lsp_id)[LSP_ID_LEN-1])) goto trunctlv; printf("\n\t lsp-id: %s", isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN)); if (!TTEST2(tlv_lsp->sequence_number, 4)) goto trunctlv; printf(", seq: 0x%08x",EXTRACT_32BITS(tlv_lsp->sequence_number)); if (!TTEST2(tlv_lsp->remaining_lifetime, 2)) goto trunctlv; printf(", lifetime: %5ds",EXTRACT_16BITS(tlv_lsp->remaining_lifetime)); if (!TTEST2(tlv_lsp->checksum, 2)) goto trunctlv; printf(", chksum: 0x%04x",EXTRACT_16BITS(tlv_lsp->checksum)); tmp-=sizeof(struct isis_tlv_lsp); tlv_lsp++; } break; case TLV_CHECKSUM: if (!TTEST2(*tptr, 2)) goto trunctlv; printf("\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 (EXTRACT_16BITS(tptr) == 0) printf("(unverified)"); else printf("(%s)", osi_cksum(optr, length) ? "incorrect" : "correct"); break; case TLV_MT_SUPPORTED: while (tmp>1) { /* length can only be a multiple of 2, otherwise there is something broken -> so decode down until length is 1 */ if (tmp!=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; } else { printf("\n\t malformed MT-ID"); break; } } break; case TLV_RESTART_SIGNALING: if (!TTEST2(*tptr, 3)) goto trunctlv; printf("\n\t Flags [%s], Remaining holding time %us", bittok2str(isis_restart_flag_values, "none", *tptr), EXTRACT_16BITS(tptr+1)); tptr+=3; break; case TLV_IDRP_INFO: if (!TTEST2(*tptr, 1)) goto trunctlv; printf("\n\t Inter-Domain Information Type: %s", tok2str(isis_subtlv_idrp_values, "Unknown (0x%02x)", *tptr)); switch (*tptr++) { case SUBTLV_IDRP_ASN: if (!TTEST2(*tptr, 2)) /* fetch AS number */ goto trunctlv; printf("AS Number: %u",EXTRACT_16BITS(tptr)); break; case SUBTLV_IDRP_LOCAL: case SUBTLV_IDRP_RES: default: if(!print_unknown_data(tptr,"\n\t ",tlv_len-1)) return(0); break; } break; case TLV_LSP_BUFFERSIZE: if (!TTEST2(*tptr, 2)) goto trunctlv; printf("\n\t LSP Buffersize: %u",EXTRACT_16BITS(tptr)); break; case TLV_PART_DIS: while (tmp >= SYSTEM_ID_LEN) { if (!TTEST2(*tptr, SYSTEM_ID_LEN)) goto trunctlv; printf("\n\t %s",isis_print_id(tptr,SYSTEM_ID_LEN)); tptr+=SYSTEM_ID_LEN; tmp-=SYSTEM_ID_LEN; } break; case TLV_PREFIX_NEIGH: if (!TTEST2(*tptr, sizeof(struct isis_metric_block))) goto trunctlv; printf("\n\t Metric Block"); isis_print_metric_block((const struct isis_metric_block *)tptr); tptr+=sizeof(struct isis_metric_block); tmp-=sizeof(struct isis_metric_block); while(tmp>0) { if (!TTEST2(*tptr, 1)) goto trunctlv; prefix_len=*tptr++; /* read out prefix length in semioctets*/ tmp--; if (!TTEST2(*tptr, prefix_len/2)) goto trunctlv; printf("\n\t\tAddress: %s/%u", print_nsap(tptr,prefix_len/2), prefix_len*4); tptr+=prefix_len/2; tmp-=prefix_len/2; } break; case TLV_IIH_SEQNR: if (!TTEST2(*tptr, 4)) /* check if four bytes are on the wire */ goto trunctlv; printf("\n\t Sequence number: %u", EXTRACT_32BITS(tptr) ); break; case TLV_VENDOR_PRIVATE: if (!TTEST2(*tptr, 3)) /* check if enough byte for a full oui */ goto trunctlv; printf("\n\t Vendor OUI Code: 0x%06x", EXTRACT_24BITS(tptr) ); tptr+=3; tmp-=3; if (tmp > 0) /* hexdump the rest */ if(!print_unknown_data(tptr,"\n\t\t",tmp)) return(0); break; /* * FIXME those are the defined TLVs that lack a decoder * you are welcome to contribute code ;-) */ case TLV_DECNET_PHASE4: case TLV_LUCENT_PRIVATE: case TLV_IPAUTH: case TLV_NORTEL_PRIVATE1: case TLV_NORTEL_PRIVATE2: default: if (vflag <= 1) { if(!print_unknown_data(pptr,"\n\t\t",tlv_len)) return(0); } break; } /* do we want to see an additionally hexdump ? */ if (vflag> 1) { if(!print_unknown_data(pptr,"\n\t ",tlv_len)) return(0); } pptr += tlv_len; packet_len -= tlv_len; } if (packet_len != 0) { printf("\n\t %u straggler bytes", packet_len); } return (1); trunc: fputs("[|isis]", stdout); return (1); trunctlv: printf("\n\t\t packet exceeded snapshot"); 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) { int32_t c0 = 0, c1 = 0; while ((int)--len >= 0) { c0 += *tptr++; c0 %= 255; c1 += c0; c1 %= 255; } return (c0 | c1); }