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amiga-tcpdump/print-isoclns.c

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/*
* 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: /Users/olsen/Code/cvs2svn-2010/os4-cvs-repository/contrib/roadshow/client-software/tcpdump-3.8.1/print-isoclns.c,v 1.2 2004-09-22 15:40:56 olsen Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "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:
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:
printf(", %s", ipaddr_string(tptr));
break;
case SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
case SUBTLV_EXT_IS_REACH_RESERVABLE_BW:
bw.i = EXTRACT_32BITS(tptr);
printf(", %.3f Mbps", bw.f*8/1000000 );
break;
case SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
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:
printf(", %u", EXTRACT_24BITS(tptr));
break;
case SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
printf(", %s, Priority %u",
bittok2str(gmpls_link_prot_values, "none", *tptr),
*(tptr+1));
break;
case SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
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<tlv_len;i++) {
if (!TTEST2(*(tptr+i), 1))
goto trunctlv;
printf("%c",*(tptr+i));
}
break;
case SUBTLV_AUTH_MD5:
for(i=1;i<tlv_len;i++) {
if (!TTEST2(*(tptr+i), 1))
goto trunctlv;
printf("%02x",*(tptr+i));
}
if (tlv_len != SUBTLV_AUTH_MD5_LEN+1)
printf(", (malformed subTLV) ");
break;
case SUBTLV_AUTH_PRIVATE:
default:
if(!print_unknown_data(tptr+1,"\n\t\t ",tlv_len-1))
return(0);
break;
}
break;
case TLV_PTP_ADJ:
tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr;
if(tmp>=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);
}
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