#ifndef lint
static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.150 2005-09-05 11:12:33 hannes Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.165 2008-08-16 13:38:15 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "extract.h"
#include "gmpls.h"
#include "oui.h"
-
-#define IPV4 1 /* AFI value */
-#define IPV6 2 /* AFI value */
+#include "signature.h"
/*
* IS-IS is defined in ISO 10589. Look there for protocol definitions.
};
#define ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* draft-ietf-isis-traffic-05 */
-#define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* draft-ietf-isis-gmpls-extensions */
+#define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* rfc4205 */
#define ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* draft-ietf-isis-traffic-05 */
#define ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* draft-ietf-isis-traffic-05 */
#define ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* draft-ietf-isis-traffic-05 */
#define ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* draft-ietf-isis-traffic-05 */
#define ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* draft-ietf-isis-traffic-05 */
#define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* rfc4124 */
+#define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD 12 /* draft-ietf-tewg-diff-te-proto-06 */
#define ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* draft-ietf-isis-traffic-05 */
-#define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* draft-ietf-isis-gmpls-extensions */
-#define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* draft-ietf-isis-gmpls-extensions */
+#define ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE 19 /* draft-ietf-isis-link-attr-01 */
+#define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* rfc4205 */
+#define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* rfc4205 */
#define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS 22 /* rfc4124 */
static struct tok isis_ext_is_reach_subtlv_values[] = {
{ ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW, "Reservable link bandwidth" },
{ ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW, "Unreserved bandwidth" },
{ ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC, "Traffic Engineering Metric" },
+ { ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE, "Link Attribute" },
{ ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE, "Link Protection Type" },
{ ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR, "Interface Switching Capability" },
+ { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD, "Bandwidth Constraints (old)" },
{ ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS, "Bandwidth Constraints" },
{ 250, "Reserved for cisco specific extensions" },
{ 251, "Reserved for cisco specific extensions" },
{ 0, NULL }
};
+static struct tok isis_subtlv_link_attribute_values[] = {
+ { 0x01, "Local Protection Available" },
+ { 0x02, "Link excluded from local protection path" },
+ { 0x04, "Local maintenance required"},
+ { 0, NULL }
+};
+
#define ISIS_SUBTLV_AUTH_SIMPLE 1
+#define ISIS_SUBTLV_AUTH_GENERIC 3 /* rfc 5310 */
#define ISIS_SUBTLV_AUTH_MD5 54
#define ISIS_SUBTLV_AUTH_MD5_LEN 16
#define ISIS_SUBTLV_AUTH_PRIVATE 255
static struct tok isis_subtlv_auth_values[] = {
{ ISIS_SUBTLV_AUTH_SIMPLE, "simple text password"},
+ { ISIS_SUBTLV_AUTH_GENERIC, "Generic Crypto key-id"},
{ ISIS_SUBTLV_AUTH_MD5, "HMAC-MD5 password"},
{ ISIS_SUBTLV_AUTH_PRIVATE, "Routing Domain private password"},
{ 0, NULL }
#define ISIS_MASK_MTFLAGS(x) ((x)&0xf000)
static struct tok isis_mt_flag_values[] = {
- { 0x4000, "sub-TLVs present"},
- { 0x8000, "ATT bit set"},
+ { 0x4000, "ATT bit set"},
+ { 0x8000, "Overload bit set"},
{ 0, NULL}
};
{ ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"},
{ ISIS_LSP_TYPE_LEVEL_1, "L1 IS"},
{ ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"},
- { ISIS_LSP_TYPE_LEVEL_2, "L1L2 IS"},
+ { ISIS_LSP_TYPE_LEVEL_2, "L2 IS"},
{ 0, NULL }
};
u_int8_t neighbor_extd_local_circuit_id[4];
};
-static int osi_cksum(const u_int8_t *, u_int);
+static void osi_print_cksum(const u_int8_t *pptr, u_int16_t checksum,
+ u_int checksum_offset, u_int length);
static int clnp_print(const u_int8_t *, u_int);
static void esis_print(const u_int8_t *, u_int);
static int isis_print(const u_int8_t *, u_int);
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;
-
if (caplen <= 1) { /* enough bytes on the wire ? */
printf("|OSI");
return;
#ifdef INET6
case NLPID_IP6:
- ip6_print(p+1, length-1);
+ ip6_print(gndo, p+1, length-1);
break;
#endif
}
printf("%slength %u",eflag ? "" : ", ",length);
- printf("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x ",
+ printf("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x",
tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type),
clnp_header->length_indicator,
clnp_header->version,
EXTRACT_16BITS(clnp_header->segment_length),
EXTRACT_16BITS(clnp_header->cksum));
- /* do not attempt to verify the checksum if it is zero */
- if (EXTRACT_16BITS(clnp_header->cksum) == 0)
- printf("(unverified)");
- else printf("(%s)", osi_cksum(optr, clnp_header->length_indicator) ? "incorrect" : "correct");
+ osi_print_cksum(optr, EXTRACT_16BITS(clnp_header->cksum), 7,
+ clnp_header->length_indicator);
printf("\n\tFlags [%s]",
bittok2str(clnp_flag_values,"none",clnp_flags));
esis_pdu_type);
printf(", v: %u%s", esis_header->version, esis_header->version == ESIS_VERSION ? "" : "unsupported" );
- printf(", checksum: 0x%04x ", EXTRACT_16BITS(esis_header->cksum));
- /* do not attempt to verify the checksum if it is zero */
- if (EXTRACT_16BITS(esis_header->cksum) == 0)
- printf("(unverified)");
- else
- printf("(%s)", osi_cksum(pptr, li) ? "incorrect" : "correct");
+ printf(", checksum: 0x%04x", EXTRACT_16BITS(esis_header->cksum));
+
+ osi_print_cksum(pptr, EXTRACT_16BITS(esis_header->cksum), 7, li);
printf(", holding time: %us, length indicator: %u",EXTRACT_16BITS(esis_header->holdtime),li);
}
/* now walk the options */
- while (li >= 2) {
+ while (li != 0) {
u_int op, opli;
const u_int8_t *tptr;
- TCHECK2(*pptr, 2);
if (li < 2) {
printf(", bad opts/li");
return;
}
+ TCHECK2(*pptr, 2);
op = *pptr++;
opli = *pptr++;
li -= 2;
switch (op) {
case ESIS_OPTION_ES_CONF_TIME:
- TCHECK2(*pptr, 2);
- printf("%us", EXTRACT_16BITS(tptr));
+ if (opli == 2) {
+ TCHECK2(*pptr, 2);
+ printf("%us", EXTRACT_16BITS(tptr));
+ } else
+ printf("(bad length)");
break;
case ESIS_OPTION_PROTOCOLS:
static int
isis_print_is_reach_subtlv (const u_int8_t *tptr,u_int subt,u_int subl,const char *ident) {
- u_int te_class,priority_level;
+ u_int te_class,priority_level,gmpls_switch_cap;
union { /* int to float conversion buffer for several subTLVs */
float f;
u_int32_t i;
case ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
if (subl >= 4) {
printf(", 0x%08x", EXTRACT_32BITS(tptr));
- if (subl == 8) /* draft-ietf-isis-gmpls-extensions */
+ if (subl == 8) /* rfc4205 */
printf(", 0x%08x", EXTRACT_32BITS(tptr+4));
}
break;
}
}
break;
- case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS:
+ case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS: /* fall through */
+ case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD:
printf("%sBandwidth Constraints Model ID: %s (%u)",
ident,
tok2str(diffserv_te_bc_values, "unknown", *tptr),
if (subl >= 3)
printf(", %u", EXTRACT_24BITS(tptr));
break;
+ case ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE:
+ if (subl == 2) {
+ printf(", [ %s ] (0x%04x)",
+ bittok2str(isis_subtlv_link_attribute_values,
+ "Unknown",
+ EXTRACT_16BITS(tptr)),
+ EXTRACT_16BITS(tptr));
+ }
+ break;
case ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
if (subl >= 2) {
printf(", %s, Priority %u",
break;
case ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
if (subl >= 36) {
+ gmpls_switch_cap = *tptr;
printf("%s Interface Switching Capability:%s",
ident,
- tok2str(gmpls_switch_cap_values, "Unknown", *(tptr)));
+ tok2str(gmpls_switch_cap_values, "Unknown", gmpls_switch_cap));
printf(", LSP Encoding: %s",
tok2str(gmpls_encoding_values, "Unknown", *(tptr+1)));
tptr+=4;
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))
+ switch (gmpls_switch_cap) {
+ case GMPLS_PSC1:
+ case GMPLS_PSC2:
+ case GMPLS_PSC3:
+ case GMPLS_PSC4:
+ bw.i = EXTRACT_32BITS(tptr);
+ printf("%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f*8/1000000);
+ printf("%s Interface MTU: %u", ident, EXTRACT_16BITS(tptr+4));
+ break;
+ case GMPLS_TSC:
+ bw.i = EXTRACT_32BITS(tptr);
+ printf("%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f*8/1000000);
+ printf("%s Indication %s", ident,
+ tok2str(gmpls_switch_cap_tsc_indication_values, "Unknown (%u)", *(tptr+4)));
+ break;
+ default:
+ /* there is some optional stuff left to decode but this is as of yet
+ not specified so just lets hexdump what is left */
+ if(subl>0){
+ if(!print_unknown_data(tptr,"\n\t\t ",
+ subl))
return(0);
+ }
}
}
break;
isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi) {
char ident_buffer[20];
+#ifdef INET6
u_int8_t prefix[sizeof(struct in6_addr)]; /* shared copy buffer for IPv4 and IPv6 prefixes */
+#else
+ u_int8_t prefix[sizeof(struct in_addr)]; /* shared copy buffer for IPv4 prefixes */
+#endif
u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen;
if (!TTEST2(*tptr, 4))
processed=4;
tptr+=4;
- if (afi == IPV4) {
+ if (afi == AF_INET) {
if (!TTEST2(*tptr, 1)) /* fetch status byte */
return (0);
status_byte=*(tptr++);
bit_length = status_byte&0x3f;
+ if (bit_length > 32) {
+ printf("%sIPv4 prefix: bad bit length %u",
+ ident,
+ bit_length);
+ return (0);
+ }
processed++;
#ifdef INET6
- } else if (afi == IPV6) {
+ } else if (afi == AF_INET6) {
if (!TTEST2(*tptr, 1)) /* fetch status & prefix_len byte */
return (0);
status_byte=*(tptr++);
bit_length=*(tptr++);
+ if (bit_length > 128) {
+ printf("%sIPv6 prefix: bad bit length %u",
+ ident,
+ bit_length);
+ return (0);
+ }
processed+=2;
#endif
} else
if (!TTEST2(*tptr, byte_length))
return (0);
- memset(prefix, 0, sizeof(struct in6_addr)); /* clear the copy buffer */
+ memset(prefix, 0, sizeof prefix); /* clear the copy buffer */
memcpy(prefix,tptr,byte_length); /* copy as much as is stored in the TLV */
tptr+=byte_length;
processed+=byte_length;
- if (afi == IPV4)
+ if (afi == AF_INET)
printf("%sIPv4 prefix: %15s/%u",
ident,
ipaddr_string(prefix),
bit_length);
#ifdef INET6
- if (afi == IPV6)
+ if (afi == AF_INET6)
printf("%sIPv6 prefix: %s/%u",
ident,
ip6addr_string(prefix),
ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up",
metric);
- if (afi == IPV4 && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
+ if (afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
printf(", sub-TLVs present");
#ifdef INET6
- if (afi == IPV6)
+ if (afi == AF_INET6)
printf(", %s%s",
ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal",
ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : "");
#endif
- if ((ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte) && afi == IPV4) ||
- (ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) && afi == IPV6)) {
+ if ((afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
+#ifdef INET6
+ || (afi == AF_INET6 && ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte))
+#endif
+ ) {
/* assume that one prefix can hold more
than one subTLV - therefore the first byte must reflect
the aggregate bytecount of the subTLVs for this prefix
const struct isis_iih_lan_header *header_iih_lan;
const struct isis_iih_ptp_header *header_iih_ptp;
- const struct isis_lsp_header *header_lsp;
+ struct isis_lsp_header *header_lsp;
const struct isis_csnp_header *header_csnp;
const struct isis_psnp_header *header_psnp;
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_short packet_len,pdu_len, key_id;
u_int i,vendor_id;
+ int sigcheck;
packet_len=length;
optr = p; /* initialize the _o_riginal pointer to the packet start -
- need it for parsing the checksum TLV */
+ need it for parsing the checksum TLV and authentication
+ TLV verification */
isis_header = (const struct isis_common_header *)p;
TCHECK(*isis_header);
pptr = p+(ISIS_COMMON_HEADER_SIZE);
header_iih_lan = (const struct isis_iih_lan_header *)pptr;
header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
- header_lsp = (const struct isis_lsp_header *)pptr;
+ header_lsp = (struct isis_lsp_header *)pptr;
header_csnp = (const struct isis_csnp_header *)pptr;
header_psnp = (const struct isis_psnp_header *)pptr;
EXTRACT_16BITS(header_lsp->remaining_lifetime),
EXTRACT_16BITS(header_lsp->checksum));
- /* if this is a purge do not attempt to verify the checksum */
- if ( EXTRACT_16BITS(header_lsp->remaining_lifetime) == 0 &&
- EXTRACT_16BITS(header_lsp->checksum) == 0)
- printf(" (purged)");
- else
- /* verify the checksum -
- * checking starts at the lsp-id field at byte position [12]
- * hence the length needs to be reduced by 12 bytes */
- printf(" (%s)", (osi_cksum((u_int8_t *)header_lsp->lsp_id, length-12)) ? "incorrect" : "correct");
+
+ osi_print_cksum((u_int8_t *)header_lsp->lsp_id,
+ EXTRACT_16BITS(header_lsp->checksum), 12, length-12);
+
+ /*
+ * Clear checksum and lifetime prior to signature verification.
+ */
+ header_lsp->checksum[0] = 0;
+ header_lsp->checksum[1] = 0;
+ header_lsp->remaining_lifetime[0] = 0;
+ header_lsp->remaining_lifetime[1] = 0;
+
printf(", PDU length: %u, Flags: [ %s",
pdu_len,
tlv_len);
if (tlv_len == 0) /* something is malformed */
- break;
+ continue;
/* now check if we have a decoder otherwise do a hexdump at the end*/
switch (tlv_type) {
break;
case ISIS_TLV_MT_IS_REACH:
+ mt_len = isis_print_mtid(tptr, "\n\t ");
+ if (mt_len == 0) /* did something go wrong ? */
+ goto trunctlv;
+ tptr+=mt_len;
+ tmp-=mt_len;
while (tmp >= 2+NODE_ID_LEN+3+1) {
- mt_len = isis_print_mtid(tptr, "\n\t ");
- if (mt_len == 0) /* did something go wrong ? */
- goto trunctlv;
- tptr+=mt_len;
- tmp-=mt_len;
-
ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type);
if (ext_is_len == 0) /* did something go wrong ? */
goto trunctlv;
case ISIS_TLV_EXTD_IP_REACH:
while (tmp>0) {
- ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV4);
+ ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET);
if (ext_ip_len == 0) /* did something go wrong ? */
goto trunctlv;
tptr+=ext_ip_len;
break;
case ISIS_TLV_MT_IP_REACH:
- while (tmp>0) {
- mt_len = isis_print_mtid(tptr, "\n\t ");
- if (mt_len == 0) /* did something go wrong ? */
- goto trunctlv;
- tptr+=mt_len;
- tmp-=mt_len;
+ mt_len = isis_print_mtid(tptr, "\n\t ");
+ if (mt_len == 0) { /* did something go wrong ? */
+ goto trunctlv;
+ }
+ tptr+=mt_len;
+ tmp-=mt_len;
- ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV4);
+ while (tmp>0) {
+ ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET);
if (ext_ip_len == 0) /* did something go wrong ? */
goto trunctlv;
tptr+=ext_ip_len;
#ifdef INET6
case ISIS_TLV_IP6_REACH:
while (tmp>0) {
- ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6);
+ ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET6);
if (ext_ip_len == 0) /* did something go wrong ? */
goto trunctlv;
tptr+=ext_ip_len;
break;
case ISIS_TLV_MT_IP6_REACH:
- while (tmp>0) {
- mt_len = isis_print_mtid(tptr, "\n\t ");
- if (mt_len == 0) /* did something go wrong ? */
- goto trunctlv;
- tptr+=mt_len;
- tmp-=mt_len;
+ mt_len = isis_print_mtid(tptr, "\n\t ");
+ if (mt_len == 0) { /* did something go wrong ? */
+ goto trunctlv;
+ }
+ tptr+=mt_len;
+ tmp-=mt_len;
- ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6);
+ while (tmp>0) {
+ ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET6);
if (ext_ip_len == 0) /* did something go wrong ? */
goto trunctlv;
tptr+=ext_ip_len;
}
if (tlv_len != ISIS_SUBTLV_AUTH_MD5_LEN+1)
printf(", (malformed subTLV) ");
+
+#ifdef HAVE_LIBCRYPTO
+ sigcheck = signature_verify(optr, length,
+ (unsigned char *)tptr + 1);
+#else
+ sigcheck = CANT_CHECK_SIGNATURE;
+#endif
+ printf(" (%s)", tok2str(signature_check_values, "Unknown", sigcheck));
+
break;
+ case ISIS_SUBTLV_AUTH_GENERIC:
+ key_id = EXTRACT_16BITS((tptr+1));
+ printf("%u, password: ", key_id);
+ for(i=1 + sizeof(u_int16_t);i<tlv_len;i++) {
+ if (!TTEST2(*(tptr+i), 1))
+ goto trunctlv;
+ printf("%02x",*(tptr+i));
+ }
+ break;
case ISIS_SUBTLV_AUTH_PRIVATE:
default:
if(!print_unknown_data(tptr+1,"\n\t\t ",tlv_len-1))
* to avoid conflicts the checksum TLV is zeroed.
* see rfc3358 for details
*/
- if (EXTRACT_16BITS(tptr) == 0)
- printf("(unverified)");
- else printf("(%s)", osi_cksum(optr, length) ? "incorrect" : "correct");
+ osi_print_cksum(optr, EXTRACT_16BITS(tptr), tptr-optr, length);
break;
case ISIS_TLV_MT_SUPPORTED:
case ISIS_TLV_RESTART_SIGNALING:
/* first attempt to decode the flags */
+ if (tmp < ISIS_TLV_RESTART_SIGNALING_FLAGLEN)
+ break;
if (!TTEST2(*tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN))
goto trunctlv;
printf("\n\t Flags [%s]",
bittok2str(isis_restart_flag_values, "none", *tptr));
- tptr+=1;
- tmp-=1;
+ tptr+=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
+ tmp-=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
- /* is there an additional remaining holdtime */
- if (tmp >= ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN) {
- if (!TTEST2(*tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN))
- goto trunctlv;
+ /* is there anything other than the flags field? */
+ if (tmp == 0)
+ break;
- printf(", Remaining holding time %us", EXTRACT_16BITS(tptr+1));
- tptr+=2;
- tmp-=2;
- }
+ if (tmp < ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN)
+ break;
+ if (!TTEST2(*tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN))
+ goto trunctlv;
+
+ printf(", Remaining holding time %us", EXTRACT_16BITS(tptr));
+ tptr+=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
+ tmp-=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
/* is there an additional sysid field present ?*/
if (tmp == SYSTEM_ID_LEN) {
return(1);
}
-/*
- * Verify the checksum. See 8473-1, Appendix C, section C.4.
- */
-
-static int
-osi_cksum(const u_int8_t *tptr, u_int len)
+static void
+osi_print_cksum (const u_int8_t *pptr, u_int16_t checksum,
+ u_int checksum_offset, u_int length)
{
- int32_t c0 = 0, c1 = 0;
+ u_int16_t calculated_checksum;
- while ((int)--len >= 0) {
- c0 += *tptr++;
- c0 %= 255;
- c1 += c0;
- c1 %= 255;
- }
- return (c0 | c1);
+ /* do not attempt to verify the checksum if it is zero */
+ if (!checksum) {
+ printf("(unverified)");
+ } else {
+ calculated_checksum = create_osi_cksum(pptr, checksum_offset, length);
+ if (checksum == calculated_checksum) {
+ printf(" (correct)");
+ } else {
+ printf(" (incorrect should be 0x%04x)", calculated_checksum);
+ }
+ }
}
-
/*
* Local Variables:
* c-style: whitesmith
projects / tcpdump / blobdiff