mirrors/tcpdump
0
0
Fork 0
mirror of https://github.com/the-tcpdump-group/tcpdump.git synced 2024-11-27 20:14:12 +08:00
Code Issues Packages Projects Releases Wiki Activity
2f7c41dda8
tcpdump/print-ospf.c
Denis Ovsienko a13a19a610 OSPF: refine unknown packet type handling 
As far as modern OSPF implementations are concerned, packet type 0 is
not a valid value, so let's print it as such. Also for an invalid packet
type tell its decimal value.
2017-02-02 20:55:03 +00:00

1202 lines
39 KiB
C
Raw Blame History

/*
* Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
* 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.
*
* OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
*/
/* \summary: Open Shortest Path First (OSPF) printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "gmpls.h"
#include "ospf.h"
static const char tstr[] = " [|ospf2]";
static const struct tok ospf_option_values[] = {
{ OSPF_OPTION_T, "MultiTopology" }, /* draft-ietf-ospf-mt-09 */
{ OSPF_OPTION_E, "External" },
{ OSPF_OPTION_MC, "Multicast" },
{ OSPF_OPTION_NP, "NSSA" },
{ OSPF_OPTION_L, "LLS" },
{ OSPF_OPTION_DC, "Demand Circuit" },
{ OSPF_OPTION_O, "Opaque" },
{ OSPF_OPTION_DN, "Up/Down" },
{ 0, NULL }
};
static const struct tok ospf_authtype_values[] = {
{ OSPF_AUTH_NONE, "none" },
{ OSPF_AUTH_SIMPLE, "simple" },
{ OSPF_AUTH_MD5, "MD5" },
{ 0, NULL }
};
static const struct tok ospf_rla_flag_values[] = {
{ RLA_FLAG_B, "ABR" },
{ RLA_FLAG_E, "ASBR" },
{ RLA_FLAG_W1, "Virtual" },
{ RLA_FLAG_W2, "W2" },
{ 0, NULL }
};
static const struct tok type2str[] = {
{ OSPF_TYPE_HELLO, "Hello" },
{ OSPF_TYPE_DD, "Database Description" },
{ OSPF_TYPE_LS_REQ, "LS-Request" },
{ OSPF_TYPE_LS_UPDATE, "LS-Update" },
{ OSPF_TYPE_LS_ACK, "LS-Ack" },
{ 0, NULL }
};
static const struct tok lsa_values[] = {
{ LS_TYPE_ROUTER, "Router" },
{ LS_TYPE_NETWORK, "Network" },
{ LS_TYPE_SUM_IP, "Summary" },
{ LS_TYPE_SUM_ABR, "ASBR Summary" },
{ LS_TYPE_ASE, "External" },
{ LS_TYPE_GROUP, "Multicast Group" },
{ LS_TYPE_NSSA, "NSSA" },
{ LS_TYPE_OPAQUE_LL, "Link Local Opaque" },
{ LS_TYPE_OPAQUE_AL, "Area Local Opaque" },
{ LS_TYPE_OPAQUE_DW, "Domain Wide Opaque" },
{ 0, NULL }
};
static const struct tok ospf_dd_flag_values[] = {
{ OSPF_DB_INIT, "Init" },
{ OSPF_DB_MORE, "More" },
{ OSPF_DB_MASTER, "Master" },
{ OSPF_DB_RESYNC, "OOBResync" },
{ 0, NULL }
};
static const struct tok lsa_opaque_values[] = {
{ LS_OPAQUE_TYPE_TE, "Traffic Engineering" },
{ LS_OPAQUE_TYPE_GRACE, "Graceful restart" },
{ LS_OPAQUE_TYPE_RI, "Router Information" },
{ 0, NULL }
};
static const struct tok lsa_opaque_te_tlv_values[] = {
{ LS_OPAQUE_TE_TLV_ROUTER, "Router Address" },
{ LS_OPAQUE_TE_TLV_LINK, "Link" },
{ 0, NULL }
};
static const struct tok lsa_opaque_te_link_tlv_subtlv_values[] = {
{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE, "Link Type" },
{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID, "Link ID" },
{ LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP, "Local Interface IP address" },
{ LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP, "Remote Interface IP address" },
{ LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC, "Traffic Engineering Metric" },
{ LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW, "Maximum Bandwidth" },
{ LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW, "Maximum Reservable Bandwidth" },
{ LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW, "Unreserved Bandwidth" },
{ LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP, "Administrative Group" },
{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE, "Link Protection Type" },
{ LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR, "Interface Switching Capability" },
{ LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP, "Shared Risk Link Group" },
{ LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS, "Bandwidth Constraints" },
{ 0, NULL }
};
static const struct tok lsa_opaque_grace_tlv_values[] = {
{ LS_OPAQUE_GRACE_TLV_PERIOD, "Grace Period" },
{ LS_OPAQUE_GRACE_TLV_REASON, "Graceful restart Reason" },
{ LS_OPAQUE_GRACE_TLV_INT_ADDRESS, "IPv4 interface address" },
{ 0, NULL }
};
static const struct tok lsa_opaque_grace_tlv_reason_values[] = {
{ LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN, "Unknown" },
{ LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART, "Software Restart" },
{ LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE, "Software Reload/Upgrade" },
{ LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH, "Control Processor Switch" },
{ 0, NULL }
};
static const struct tok lsa_opaque_te_tlv_link_type_sub_tlv_values[] = {
{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP, "Point-to-point" },
{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA, "Multi-Access" },
{ 0, NULL }
};
static const struct tok lsa_opaque_ri_tlv_values[] = {
{ LS_OPAQUE_RI_TLV_CAP, "Router Capabilities" },
{ 0, NULL }
};
static const struct tok lsa_opaque_ri_tlv_cap_values[] = {
{ 1, "Reserved" },
{ 2, "Reserved" },
{ 4, "Reserved" },
{ 8, "Reserved" },
{ 16, "graceful restart capable" },
{ 32, "graceful restart helper" },
{ 64, "Stub router support" },
{ 128, "Traffic engineering" },
{ 256, "p2p over LAN" },
{ 512, "path computation server" },
{ 0, NULL }
};
static const struct tok ospf_lls_tlv_values[] = {
{ OSPF_LLS_EO, "Extended Options" },
{ OSPF_LLS_MD5, "MD5 Authentication" },
{ 0, NULL }
};
static const struct tok ospf_lls_eo_options[] = {
{ OSPF_LLS_EO_LR, "LSDB resync" },
{ OSPF_LLS_EO_RS, "Restart" },
{ 0, NULL }
};
int
ospf_print_grace_lsa(netdissect_options *ndo,
const uint8_t *tptr, u_int ls_length)
{
u_int tlv_type, tlv_length;
while (ls_length > 0) {
ND_TCHECK2(*tptr, 4);
if (ls_length < 4) {
ND_PRINT((ndo, "\n\t Remaining LS length %u < 4", ls_length));
return -1;
}
tlv_type = EXTRACT_16BITS(tptr);
tlv_length = EXTRACT_16BITS(tptr+2);
tptr+=4;
ls_length-=4;
ND_PRINT((ndo, "\n\t %s TLV (%u), length %u, value: ",
tok2str(lsa_opaque_grace_tlv_values,"unknown",tlv_type),
tlv_type,
tlv_length));
if (tlv_length > ls_length) {
ND_PRINT((ndo, "\n\t Bogus length %u > %u", tlv_length,
ls_length));
return -1;
}
/* Infinite loop protection. */
if (tlv_type == 0 || tlv_length ==0) {
return -1;
}
ND_TCHECK2(*tptr, tlv_length);
switch(tlv_type) {
case LS_OPAQUE_GRACE_TLV_PERIOD:
if (tlv_length != 4) {
ND_PRINT((ndo, "\n\t Bogus length %u != 4", tlv_length));
return -1;
}
ND_PRINT((ndo, "%us", EXTRACT_32BITS(tptr)));
break;
case LS_OPAQUE_GRACE_TLV_REASON:
if (tlv_length != 1) {
ND_PRINT((ndo, "\n\t Bogus length %u != 1", tlv_length));
return -1;
}
ND_PRINT((ndo, "%s (%u)",
tok2str(lsa_opaque_grace_tlv_reason_values, "Unknown", *tptr),
*tptr));
break;
case LS_OPAQUE_GRACE_TLV_INT_ADDRESS:
if (tlv_length != 4) {
ND_PRINT((ndo, "\n\t Bogus length %u != 4", tlv_length));
return -1;
}
ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
break;
default:
if (ndo->ndo_vflag <= 1) {
if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
return -1;
}
break;
}
/* in OSPF everything has to be 32-bit aligned, including TLVs */
if (tlv_length%4 != 0)
tlv_length+=4-(tlv_length%4);
ls_length-=tlv_length;
tptr+=tlv_length;
}
return 0;
trunc:
return -1;
}
int
ospf_print_te_lsa(netdissect_options *ndo,
const uint8_t *tptr, u_int ls_length)
{
u_int tlv_type, tlv_length, subtlv_type, subtlv_length;
u_int priority_level, te_class, count_srlg;
union { /* int to float conversion buffer for several subTLVs */
float f;
uint32_t i;
} bw;
while (ls_length != 0) {
ND_TCHECK2(*tptr, 4);
if (ls_length < 4) {
ND_PRINT((ndo, "\n\t Remaining LS length %u < 4", ls_length));
return -1;
}
tlv_type = EXTRACT_16BITS(tptr);
tlv_length = EXTRACT_16BITS(tptr+2);
tptr+=4;
ls_length-=4;
ND_PRINT((ndo, "\n\t %s TLV (%u), length: %u",
tok2str(lsa_opaque_te_tlv_values,"unknown",tlv_type),
tlv_type,
tlv_length));
if (tlv_length > ls_length) {
ND_PRINT((ndo, "\n\t Bogus length %u > %u", tlv_length,
ls_length));
return -1;
}
/* Infinite loop protection. */
if (tlv_type == 0 || tlv_length ==0) {
return -1;
}
switch(tlv_type) {
case LS_OPAQUE_TE_TLV_LINK:
while (tlv_length >= sizeof(subtlv_type) + sizeof(subtlv_length)) {
if (tlv_length < 4) {
ND_PRINT((ndo, "\n\t Remaining TLV length %u < 4",
tlv_length));
return -1;
}
ND_TCHECK2(*tptr, 4);
subtlv_type = EXTRACT_16BITS(tptr);
subtlv_length = EXTRACT_16BITS(tptr+2);
tptr+=4;
tlv_length-=4;
/* Infinite loop protection */
if (subtlv_type == 0 || subtlv_length == 0)
goto invalid;
ND_PRINT((ndo, "\n\t %s subTLV (%u), length: %u",
tok2str(lsa_opaque_te_link_tlv_subtlv_values,"unknown",subtlv_type),
subtlv_type,
subtlv_length));
ND_TCHECK2(*tptr, subtlv_length);
switch(subtlv_type) {
case LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP:
if (subtlv_length != 4) {
ND_PRINT((ndo, " != 4"));
goto invalid;
}
ND_PRINT((ndo, ", 0x%08x", EXTRACT_32BITS(tptr)));
break;
case LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID:
case LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID:
if (subtlv_length != 4 && subtlv_length != 8) {
ND_PRINT((ndo, " != 4 && != 8"));
goto invalid;
}
ND_PRINT((ndo, ", %s (0x%08x)",
ipaddr_string(ndo, tptr),
EXTRACT_32BITS(tptr)));
if (subtlv_length == 8) /* rfc4203 */
ND_PRINT((ndo, ", %s (0x%08x)",
ipaddr_string(ndo, tptr+4),
EXTRACT_32BITS(tptr + 4)));
break;
case LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP:
case LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP:
if (subtlv_length != 4) {
ND_PRINT((ndo, " != 4"));
goto invalid;
}
ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr)));
break;
case LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW:
case LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW:
if (subtlv_length != 4) {
ND_PRINT((ndo, " != 4"));
goto invalid;
}
bw.i = EXTRACT_32BITS(tptr);
ND_PRINT((ndo, ", %.3f Mbps", bw.f * 8 / 1000000));
break;
case LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW:
if (subtlv_length != 32) {
ND_PRINT((ndo, " != 32"));
goto invalid;
}
for (te_class = 0; te_class < 8; te_class++) {
bw.i = EXTRACT_32BITS(tptr+te_class*4);
ND_PRINT((ndo, "\n\t\tTE-Class %u: %.3f Mbps",
te_class,
bw.f * 8 / 1000000));
}
break;
case LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS:
if (subtlv_length < 4) {
ND_PRINT((ndo, " < 4"));
goto invalid;
}
/* BC Model Id (1 octet) + Reserved (3 octets) */
ND_PRINT((ndo, "\n\t\tBandwidth Constraints Model ID: %s (%u)",
tok2str(diffserv_te_bc_values, "unknown", *tptr),
*tptr));
if (subtlv_length % 4 != 0) {
ND_PRINT((ndo, "\n\t\tlength %u != N x 4", subtlv_length));
goto invalid;
}
if (subtlv_length > 36) {
ND_PRINT((ndo, "\n\t\tlength %u > 36", subtlv_length));
goto invalid;
}
/* decode BCs until the subTLV ends */
for (te_class = 0; te_class < (subtlv_length-4)/4; te_class++) {
bw.i = EXTRACT_32BITS(tptr+4+te_class*4);
ND_PRINT((ndo, "\n\t\t Bandwidth constraint CT%u: %.3f Mbps",
te_class,
bw.f * 8 / 1000000));
}
break;
case LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC:
if (subtlv_length != 4) {
ND_PRINT((ndo, " != 4"));
goto invalid;
}
ND_PRINT((ndo, ", Metric %u", EXTRACT_32BITS(tptr)));
break;
case LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE:
/* Protection Cap (1 octet) + Reserved ((3 octets) */
if (subtlv_length != 4) {
ND_PRINT((ndo, " != 4"));
goto invalid;
}
ND_PRINT((ndo, ", %s",
bittok2str(gmpls_link_prot_values, "none", *tptr)));
break;
case LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR:
if (subtlv_length < 36) {
ND_PRINT((ndo, " < 36"));
goto invalid;
}
/* Switching Cap (1 octet) + Encoding (1) + Reserved (2) */
ND_PRINT((ndo, "\n\t\tInterface Switching Capability: %s",
tok2str(gmpls_switch_cap_values, "Unknown", *(tptr))));
ND_PRINT((ndo, "\n\t\tLSP Encoding: %s\n\t\tMax LSP Bandwidth:",
tok2str(gmpls_encoding_values, "Unknown", *(tptr + 1))));
for (priority_level = 0; priority_level < 8; priority_level++) {
bw.i = EXTRACT_32BITS(tptr+4+(priority_level*4));
ND_PRINT((ndo, "\n\t\t priority level %d: %.3f Mbps",
priority_level,
bw.f * 8 / 1000000));
}
break;
case LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE:
if (subtlv_length != 1) {
ND_PRINT((ndo, " != 1"));
goto invalid;
}
ND_PRINT((ndo, ", %s (%u)",
tok2str(lsa_opaque_te_tlv_link_type_sub_tlv_values,"unknown",*tptr),
*tptr));
break;
case LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP:
if (subtlv_length % 4 != 0) {
ND_PRINT((ndo, " != N x 4"));
goto invalid;
}
count_srlg = subtlv_length / 4;
if (count_srlg != 0)
ND_PRINT((ndo, "\n\t\t Shared risk group: "));
while (count_srlg > 0) {
bw.i = EXTRACT_32BITS(tptr);
ND_PRINT((ndo, "%d", bw.i));
tptr+=4;
count_srlg--;
if (count_srlg > 0)
ND_PRINT((ndo, ", "));
}
break;
default:
if (ndo->ndo_vflag <= 1) {
if (!print_unknown_data(ndo, tptr, "\n\t\t", subtlv_length))
return -1;
}
break;
}
/* in OSPF everything has to be 32-bit aligned, including subTLVs */
if (subtlv_length%4 != 0)
subtlv_length+=4-(subtlv_length%4);
tlv_length-=subtlv_length;
tptr+=subtlv_length;
}
break;
case LS_OPAQUE_TE_TLV_ROUTER:
if (tlv_length < 4) {
ND_PRINT((ndo, "\n\t TLV length %u < 4", tlv_length));
return -1;
}
ND_TCHECK2(*tptr, 4);
ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr)));
break;
default:
if (ndo->ndo_vflag <= 1) {
if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
return -1;
}
break;
}
/* in OSPF everything has to be 32-bit aligned, including TLVs */
if (tlv_length%4 != 0)
tlv_length+=4-(tlv_length%4);
ls_length-=tlv_length;
tptr+=tlv_length;
}
return 0;
trunc:
return -1;
invalid:
ND_PRINT((ndo, "%s", istr));
return -1;
}
static int
ospf_print_lshdr(netdissect_options *ndo,
register const struct lsa_hdr *lshp)
{
u_int ls_length;
ND_TCHECK(lshp->ls_length);
ls_length = EXTRACT_16BITS(&lshp->ls_length);
if (ls_length < sizeof(struct lsa_hdr)) {
ND_PRINT((ndo, "\n\t Bogus length %u < header (%lu)", ls_length,
(unsigned long)sizeof(struct lsa_hdr)));
return(-1);
}
ND_TCHECK(lshp->ls_seq); /* XXX - ls_length check checked this */
ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
ipaddr_string(ndo, &lshp->ls_router),
EXTRACT_32BITS(&lshp->ls_seq),
EXTRACT_16BITS(&lshp->ls_age),
ls_length - (u_int)sizeof(struct lsa_hdr)));
ND_TCHECK(lshp->ls_type); /* XXX - ls_length check checked this */
switch (lshp->ls_type) {
/* the LSA header for opaque LSAs was slightly changed */
case LS_TYPE_OPAQUE_LL:
case LS_TYPE_OPAQUE_AL:
case LS_TYPE_OPAQUE_DW:
ND_PRINT((ndo, "\n\t %s LSA (%d), Opaque-Type %s LSA (%u), Opaque-ID %u",
tok2str(lsa_values,"unknown",lshp->ls_type),
lshp->ls_type,
tok2str(lsa_opaque_values,
"unknown",
*(&lshp->un_lsa_id.opaque_field.opaque_type)),
*(&lshp->un_lsa_id.opaque_field.opaque_type),
EXTRACT_24BITS(&lshp->un_lsa_id.opaque_field.opaque_id)
));
break;
/* all other LSA types use regular style LSA headers */
default:
ND_PRINT((ndo, "\n\t %s LSA (%d), LSA-ID: %s",
tok2str(lsa_values,"unknown",lshp->ls_type),
lshp->ls_type,
ipaddr_string(ndo, &lshp->un_lsa_id.lsa_id)));
break;
}
ND_TCHECK(lshp->ls_options); /* XXX - ls_length check checked this */
ND_PRINT((ndo, "\n\t Options: [%s]", bittok2str(ospf_option_values, "none", lshp->ls_options)));
return (ls_length);
trunc:
return (-1);
}
/* draft-ietf-ospf-mt-09 */
static const struct tok ospf_topology_values[] = {
{ 0, "default" },
{ 1, "multicast" },
{ 2, "management" },
{ 0, NULL }
};
/*
* Print all the per-topology metrics.
*/
static int
ospf_print_tos_metrics(netdissect_options *ndo,
const union un_tos *tos)
{
int metric_count;
int toscount;
toscount = tos->link.link_tos_count+1;
metric_count = 0;
/*
* All but the first metric contain a valid topology id.
*/
while (toscount > 0) {
ND_TCHECK(*tos);
ND_PRINT((ndo, "\n\t\ttopology %s (%u), metric %u",
tok2str(ospf_topology_values, "Unknown",
metric_count ? tos->metrics.tos_type : 0),
metric_count ? tos->metrics.tos_type : 0,
EXTRACT_16BITS(&tos->metrics.tos_metric)));
metric_count++;
tos++;
toscount--;
}
return 0;
trunc:
return 1;
}
/*
* Print a single link state advertisement. If truncated or if LSA length
* field is less than the length of the LSA header, return NULl, else
* return pointer to data past end of LSA.
*/
static const uint8_t *
ospf_print_lsa(netdissect_options *ndo,
register const struct lsa *lsap)
{
register const uint8_t *ls_end;
register const struct rlalink *rlp;
register const struct in_addr *ap;
register const struct aslametric *almp;
register const struct mcla *mcp;
register const uint32_t *lp;
register int j, tlv_type, tlv_length, topology;
register int ls_length;
const uint8_t *tptr;
tptr = (const uint8_t *)lsap->lsa_un.un_unknown; /* squelch compiler warnings */
ls_length = ospf_print_lshdr(ndo, &lsap->ls_hdr);
if (ls_length == -1)
return(NULL);
ls_end = (const uint8_t *)lsap + ls_length;
ls_length -= sizeof(struct lsa_hdr);
switch (lsap->ls_hdr.ls_type) {
case LS_TYPE_ROUTER:
ND_TCHECK(lsap->lsa_un.un_rla.rla_flags);
ND_PRINT((ndo, "\n\t Router LSA Options: [%s]",
bittok2str(ospf_rla_flag_values, "none", lsap->lsa_un.un_rla.rla_flags)));
ND_TCHECK(lsap->lsa_un.un_rla.rla_count);
j = EXTRACT_16BITS(&lsap->lsa_un.un_rla.rla_count);
ND_TCHECK(lsap->lsa_un.un_rla.rla_link);
rlp = lsap->lsa_un.un_rla.rla_link;
while (j--) {
ND_TCHECK(*rlp);
switch (rlp->un_tos.link.link_type) {
case RLA_TYPE_VIRTUAL:
ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID: %s, Interface Address: %s",
ipaddr_string(ndo, &rlp->link_id),
ipaddr_string(ndo, &rlp->link_data)));
break;
case RLA_TYPE_ROUTER:
ND_PRINT((ndo, "\n\t Neighbor Router-ID: %s, Interface Address: %s",
ipaddr_string(ndo, &rlp->link_id),
ipaddr_string(ndo, &rlp->link_data)));
break;
case RLA_TYPE_TRANSIT:
ND_PRINT((ndo, "\n\t Neighbor Network-ID: %s, Interface Address: %s",
ipaddr_string(ndo, &rlp->link_id),
ipaddr_string(ndo, &rlp->link_data)));
break;
case RLA_TYPE_STUB:
ND_PRINT((ndo, "\n\t Stub Network: %s, Mask: %s",
ipaddr_string(ndo, &rlp->link_id),
ipaddr_string(ndo, &rlp->link_data)));
break;
default:
ND_PRINT((ndo, "\n\t Unknown Router Link Type (%u)",
rlp->un_tos.link.link_type));
return (ls_end);
}
if (ospf_print_tos_metrics(ndo, &rlp->un_tos))
goto trunc;
rlp = (const struct rlalink *)((const u_char *)(rlp + 1) +
((rlp->un_tos.link.link_tos_count) * sizeof(union un_tos)));
}
break;
case LS_TYPE_NETWORK:
ND_TCHECK(lsap->lsa_un.un_nla.nla_mask);
ND_PRINT((ndo, "\n\t Mask %s\n\t Connected Routers:",
ipaddr_string(ndo, &lsap->lsa_un.un_nla.nla_mask)));
ap = lsap->lsa_un.un_nla.nla_router;
while ((const u_char *)ap < ls_end) {
ND_TCHECK(*ap);
ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap)));
++ap;
}
break;
case LS_TYPE_SUM_IP:
ND_TCHECK(lsap->lsa_un.un_nla.nla_mask);
ND_PRINT((ndo, "\n\t Mask %s",
ipaddr_string(ndo, &lsap->lsa_un.un_sla.sla_mask)));
ND_TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
lp = lsap->lsa_un.un_sla.sla_tosmetric;
while ((const u_char *)lp < ls_end) {
register uint32_t ul;
ND_TCHECK(*lp);
ul = EXTRACT_32BITS(lp);
topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
ND_PRINT((ndo, "\n\t\ttopology %s (%u) metric %d",
tok2str(ospf_topology_values, "Unknown", topology),
topology,
ul & SLA_MASK_METRIC));
++lp;
}
break;
case LS_TYPE_SUM_ABR:
ND_TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
lp = lsap->lsa_un.un_sla.sla_tosmetric;
while ((const u_char *)lp < ls_end) {
register uint32_t ul;
ND_TCHECK(*lp);
ul = EXTRACT_32BITS(lp);
topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
ND_PRINT((ndo, "\n\t\ttopology %s (%u) metric %d",
tok2str(ospf_topology_values, "Unknown", topology),
topology,
ul & SLA_MASK_METRIC));
++lp;
}
break;
case LS_TYPE_ASE:
case LS_TYPE_NSSA: /* fall through - those LSAs share the same format */
ND_TCHECK(lsap->lsa_un.un_nla.nla_mask);
ND_PRINT((ndo, "\n\t Mask %s",
ipaddr_string(ndo, &lsap->lsa_un.un_asla.asla_mask)));
ND_TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
almp = lsap->lsa_un.un_asla.asla_metric;
while ((const u_char *)almp < ls_end) {
register uint32_t ul;
ND_TCHECK(almp->asla_tosmetric);
ul = EXTRACT_32BITS(&almp->asla_tosmetric);
topology = ((ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS);
ND_PRINT((ndo, "\n\t\ttopology %s (%u), type %d, metric",
tok2str(ospf_topology_values, "Unknown", topology),
topology,
(ul & ASLA_FLAG_EXTERNAL) ? 2 : 1));
if ((ul & ASLA_MASK_METRIC) == 0xffffff)
ND_PRINT((ndo, " infinite"));
else
ND_PRINT((ndo, " %d", (ul & ASLA_MASK_METRIC)));
ND_TCHECK(almp->asla_forward);
if (almp->asla_forward.s_addr) {
ND_PRINT((ndo, ", forward %s", ipaddr_string(ndo, &almp->asla_forward)));
}
ND_TCHECK(almp->asla_tag);
if (almp->asla_tag.s_addr) {
ND_PRINT((ndo, ", tag %s", ipaddr_string(ndo, &almp->asla_tag)));
}
++almp;
}
break;
case LS_TYPE_GROUP:
/* Multicast extensions as of 23 July 1991 */
mcp = lsap->lsa_un.un_mcla;
while ((const u_char *)mcp < ls_end) {
ND_TCHECK(mcp->mcla_vid);
switch (EXTRACT_32BITS(&mcp->mcla_vtype)) {
case MCLA_VERTEX_ROUTER:
ND_PRINT((ndo, "\n\t Router Router-ID %s",
ipaddr_string(ndo, &mcp->mcla_vid)));
break;
case MCLA_VERTEX_NETWORK:
ND_PRINT((ndo, "\n\t Network Designated Router %s",
ipaddr_string(ndo, &mcp->mcla_vid)));
break;
default:
ND_PRINT((ndo, "\n\t unknown VertexType (%u)",
EXTRACT_32BITS(&mcp->mcla_vtype)));
break;
}
++mcp;
}
break;
case LS_TYPE_OPAQUE_LL: /* fall through */
case LS_TYPE_OPAQUE_AL:
case LS_TYPE_OPAQUE_DW:
switch (*(&lsap->ls_hdr.un_lsa_id.opaque_field.opaque_type)) {
case LS_OPAQUE_TYPE_RI:
tptr = (const uint8_t *)(&lsap->lsa_un.un_ri_tlv.type);
while (ls_length != 0) {
ND_TCHECK2(*tptr, 4);
if (ls_length < 4) {
ND_PRINT((ndo, "\n\t Remaining LS length %u < 4", ls_length));
return(ls_end);
}
tlv_type = EXTRACT_16BITS(tptr);
tlv_length = EXTRACT_16BITS(tptr+2);
tptr+=4;
ls_length-=4;
ND_PRINT((ndo, "\n\t %s TLV (%u), length: %u, value: ",
tok2str(lsa_opaque_ri_tlv_values,"unknown",tlv_type),
tlv_type,
tlv_length));
if (tlv_length > ls_length) {
ND_PRINT((ndo, "\n\t Bogus length %u > %u", tlv_length,
ls_length));
return(ls_end);
}
ND_TCHECK2(*tptr, tlv_length);
switch(tlv_type) {
case LS_OPAQUE_RI_TLV_CAP:
if (tlv_length != 4) {
ND_PRINT((ndo, "\n\t Bogus length %u != 4", tlv_length));
return(ls_end);
}
ND_PRINT((ndo, "Capabilities: %s",
bittok2str(lsa_opaque_ri_tlv_cap_values, "Unknown", EXTRACT_32BITS(tptr))));
break;
default:
if (ndo->ndo_vflag <= 1) {
if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
return(ls_end);
}
break;
}
tptr+=tlv_length;
ls_length-=tlv_length;
}
break;
case LS_OPAQUE_TYPE_GRACE:
if (ospf_print_grace_lsa(ndo, (const uint8_t *)(&lsap->lsa_un.un_grace_tlv.type),
ls_length) == -1) {
return(ls_end);
}
break;
case LS_OPAQUE_TYPE_TE:
if (ospf_print_te_lsa(ndo, (const uint8_t *)(&lsap->lsa_un.un_te_lsa_tlv.type),
ls_length) == -1) {
return(ls_end);
}
break;
default:
if (ndo->ndo_vflag <= 1) {
if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
"\n\t ", ls_length))
return(ls_end);
}
break;
}
}
/* do we want to see an additionally hexdump ? */
if (ndo->ndo_vflag> 1)
if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
"\n\t ", ls_length)) {
return(ls_end);
}
return (ls_end);
trunc:
return (NULL);
}
static int
ospf_decode_lls(netdissect_options *ndo,
register const struct ospfhdr *op, register u_int length)
{
register const u_char *dptr;
register const u_char *dataend;
register u_int length2;
register uint16_t lls_type, lls_len;
register uint32_t lls_flags;
switch (op->ospf_type) {
case OSPF_TYPE_HELLO:
if (!(op->ospf_hello.hello_options & OSPF_OPTION_L))
return (0);
break;
case OSPF_TYPE_DD:
if (!(op->ospf_db.db_options & OSPF_OPTION_L))
return (0);
break;
default:
return (0);
}
/* dig deeper if LLS data is available; see RFC4813 */
length2 = EXTRACT_16BITS(&op->ospf_len);
dptr = (const u_char *)op + length2;
dataend = (const u_char *)op + length;
if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
dptr = dptr + op->ospf_authdata[3];
length2 += op->ospf_authdata[3];
}
if (length2 >= length) {
ND_PRINT((ndo, "\n\t[LLS truncated]"));
return (1);
}
ND_TCHECK2(*dptr, 2);
ND_PRINT((ndo, "\n\t LLS: checksum: 0x%04x", (u_int)EXTRACT_16BITS(dptr)));
dptr += 2;
ND_TCHECK2(*dptr, 2);
length2 = EXTRACT_16BITS(dptr);
ND_PRINT((ndo, ", length: %u", length2));
dptr += 2;
ND_TCHECK(*dptr);
while (dptr < dataend) {
ND_TCHECK2(*dptr, 2);
lls_type = EXTRACT_16BITS(dptr);
ND_PRINT((ndo, "\n\t %s (%u)",
tok2str(ospf_lls_tlv_values,"Unknown TLV",lls_type),
lls_type));
dptr += 2;
ND_TCHECK2(*dptr, 2);
lls_len = EXTRACT_16BITS(dptr);
ND_PRINT((ndo, ", length: %u", lls_len));
dptr += 2;
switch (lls_type) {
case OSPF_LLS_EO:
if (lls_len != 4) {
ND_PRINT((ndo, " [should be 4]"));
lls_len = 4;
}
ND_TCHECK2(*dptr, 4);
lls_flags = EXTRACT_32BITS(dptr);
ND_PRINT((ndo, "\n\t Options: 0x%08x [%s]", lls_flags,
bittok2str(ospf_lls_eo_options, "?", lls_flags)));
break;
case OSPF_LLS_MD5:
if (lls_len != 20) {
ND_PRINT((ndo, " [should be 20]"));
lls_len = 20;
}
ND_TCHECK2(*dptr, 4);
ND_PRINT((ndo, "\n\t Sequence number: 0x%08x", EXTRACT_32BITS(dptr)));
break;
}
dptr += lls_len;
}
return (0);
trunc:
return (1);
}
static int
ospf_decode_v2(netdissect_options *ndo,
register const struct ospfhdr *op, register const u_char *dataend)
{
register const struct in_addr *ap;
register const struct lsr *lsrp;
register const struct lsa_hdr *lshp;
register const struct lsa *lsap;
register uint32_t lsa_count,lsa_count_max;
switch (op->ospf_type) {
case OSPF_TYPE_HELLO:
ND_TCHECK(op->ospf_hello.hello_options);
ND_PRINT((ndo, "\n\tOptions [%s]",
bittok2str(ospf_option_values,"none",op->ospf_hello.hello_options)));
ND_TCHECK(op->ospf_hello.hello_deadint);
ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Mask %s, Priority %u",
EXTRACT_16BITS(&op->ospf_hello.hello_helloint),
EXTRACT_32BITS(&op->ospf_hello.hello_deadint),
ipaddr_string(ndo, &op->ospf_hello.hello_mask),
op->ospf_hello.hello_priority));
ND_TCHECK(op->ospf_hello.hello_dr);
if (op->ospf_hello.hello_dr.s_addr != 0)
ND_PRINT((ndo, "\n\t Designated Router %s",
ipaddr_string(ndo, &op->ospf_hello.hello_dr)));
ND_TCHECK(op->ospf_hello.hello_bdr);
if (op->ospf_hello.hello_bdr.s_addr != 0)
ND_PRINT((ndo, ", Backup Designated Router %s",
ipaddr_string(ndo, &op->ospf_hello.hello_bdr)));
ap = op->ospf_hello.hello_neighbor;
if ((const u_char *)ap < dataend)
ND_PRINT((ndo, "\n\t Neighbor List:"));
while ((const u_char *)ap < dataend) {
ND_TCHECK(*ap);
ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap)));
++ap;
}
break; /* HELLO */
case OSPF_TYPE_DD:
ND_TCHECK(op->ospf_db.db_options);
ND_PRINT((ndo, "\n\tOptions [%s]",
bittok2str(ospf_option_values, "none", op->ospf_db.db_options)));
ND_TCHECK(op->ospf_db.db_flags);
ND_PRINT((ndo, ", DD Flags [%s]",
bittok2str(ospf_dd_flag_values, "none", op->ospf_db.db_flags)));
ND_TCHECK(op->ospf_db.db_ifmtu);
if (op->ospf_db.db_ifmtu) {
ND_PRINT((ndo, ", MTU: %u", EXTRACT_16BITS(&op->ospf_db.db_ifmtu)));
}
ND_TCHECK(op->ospf_db.db_seq);
ND_PRINT((ndo, ", Sequence: 0x%08x", EXTRACT_32BITS(&op->ospf_db.db_seq)));
/* Print all the LS adv's */
lshp = op->ospf_db.db_lshdr;
while (((const u_char *)lshp < dataend) && ospf_print_lshdr(ndo, lshp) != -1) {
++lshp;
}
break;
case OSPF_TYPE_LS_REQ:
lsrp = op->ospf_lsr;
while ((const u_char *)lsrp < dataend) {
ND_TCHECK(*lsrp);
ND_PRINT((ndo, "\n\t Advertising Router: %s, %s LSA (%u)",
ipaddr_string(ndo, &lsrp->ls_router),
tok2str(lsa_values,"unknown",EXTRACT_32BITS(lsrp->ls_type)),
EXTRACT_32BITS(&lsrp->ls_type)));
switch (EXTRACT_32BITS(lsrp->ls_type)) {
/* the LSA header for opaque LSAs was slightly changed */
case LS_TYPE_OPAQUE_LL:
case LS_TYPE_OPAQUE_AL:
case LS_TYPE_OPAQUE_DW:
ND_PRINT((ndo, ", Opaque-Type: %s LSA (%u), Opaque-ID: %u",
tok2str(lsa_opaque_values, "unknown",lsrp->un_ls_stateid.opaque_field.opaque_type),
lsrp->un_ls_stateid.opaque_field.opaque_type,
EXTRACT_24BITS(&lsrp->un_ls_stateid.opaque_field.opaque_id)));
break;
default:
ND_PRINT((ndo, ", LSA-ID: %s",
ipaddr_string(ndo, &lsrp->un_ls_stateid.ls_stateid)));
break;
}
++lsrp;
}
break;
case OSPF_TYPE_LS_UPDATE:
lsap = op->ospf_lsu.lsu_lsa;
ND_TCHECK(op->ospf_lsu.lsu_count);
lsa_count_max = EXTRACT_32BITS(&op->ospf_lsu.lsu_count);
ND_PRINT((ndo, ", %d LSA%s", lsa_count_max, PLURAL_SUFFIX(lsa_count_max)));
for (lsa_count=1;lsa_count <= lsa_count_max;lsa_count++) {
ND_PRINT((ndo, "\n\t LSA #%u", lsa_count));
lsap = (const struct lsa *)ospf_print_lsa(ndo, lsap);
if (lsap == NULL)
goto trunc;
}
break;
case OSPF_TYPE_LS_ACK:
lshp = op->ospf_lsa.lsa_lshdr;
while (ospf_print_lshdr(ndo, lshp) != -1) {
++lshp;
}
break;
default:
break;
}
return (0);
trunc:
return (1);
}
void
ospf_print(netdissect_options *ndo,
register const u_char *bp, register u_int length,
const u_char *bp2 _U_)
{
register const struct ospfhdr *op;
register const u_char *dataend;
register const char *cp;
op = (const struct ospfhdr *)bp;
/* XXX Before we do anything else, strip off the MD5 trailer */
ND_TCHECK(op->ospf_authtype);
if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
length -= OSPF_AUTH_MD5_LEN;
ndo->ndo_snapend -= OSPF_AUTH_MD5_LEN;
}
/* If the type is valid translate it, or just print the type */
/* value. If it's not valid, say so and return */
ND_TCHECK(op->ospf_type);
cp = tok2str(type2str, "unknown LS-type %u", op->ospf_type);
ND_PRINT((ndo, "OSPFv%u, %s, length %u", op->ospf_version, cp, length));
if (*cp == 'u')
return;
if (!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
return;
}
ND_TCHECK(op->ospf_len);
if (length != EXTRACT_16BITS(&op->ospf_len)) {
ND_PRINT((ndo, " [len %d]", EXTRACT_16BITS(&op->ospf_len)));
}
if (length > EXTRACT_16BITS(&op->ospf_len)) {
dataend = bp + EXTRACT_16BITS(&op->ospf_len);
} else {
dataend = bp + length;
}
ND_TCHECK(op->ospf_routerid);
ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf_routerid)));
ND_TCHECK(op->ospf_areaid);
if (op->ospf_areaid.s_addr != 0)
ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf_areaid)));
else
ND_PRINT((ndo, ", Backbone Area"));
if (ndo->ndo_vflag) {
/* Print authentication data (should we really do this?) */
ND_TCHECK2(op->ospf_authdata[0], sizeof(op->ospf_authdata));
ND_PRINT((ndo, ", Authentication Type: %s (%u)",
tok2str(ospf_authtype_values, "unknown", EXTRACT_16BITS(&op->ospf_authtype)),
EXTRACT_16BITS(&op->ospf_authtype)));
switch (EXTRACT_16BITS(&op->ospf_authtype)) {
case OSPF_AUTH_NONE:
break;
case OSPF_AUTH_SIMPLE:
ND_PRINT((ndo, "\n\tSimple text password: "));
safeputs(ndo, op->ospf_authdata, OSPF_AUTH_SIMPLE_LEN);
break;
case OSPF_AUTH_MD5:
ND_PRINT((ndo, "\n\tKey-ID: %u, Auth-Length: %u, Crypto Sequence Number: 0x%08x",
*((op->ospf_authdata) + 2),
*((op->ospf_authdata) + 3),
EXTRACT_32BITS((op->ospf_authdata) + 4)));
break;
default:
return;
}
}
/* Do rest according to version. */
switch (op->ospf_version) {
case 2:
/* ospf version 2 */
if (ospf_decode_v2(ndo, op, dataend))
goto trunc;
if (length > EXTRACT_16BITS(&op->ospf_len)) {
if (ospf_decode_lls(ndo, op, length))
goto trunc;
}
break;
default:
ND_PRINT((ndo, " ospf [version %d]", op->ospf_version));
break;
} /* end switch on version */
return;
trunc:
ND_PRINT((ndo, "%s", tstr));
}
Reference in New Issue View Git Blame Copy Permalink