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tcpdump/print-ospf6.c
Francois-Xavier Le Bail acd0ac7443 OSPFv3: Remove two unnecessary dereferences 
Remove also two unnecessary ND_TCHECK_SIZE().

Moreover:
Remove an unnecessary cast.
2022-02-18 20:05:35 +01:00

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/*
* 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: IPv6 Open Shortest Path First (OSPFv3) printer */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include <string.h>
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "ospf.h"
#define OSPF_TYPE_HELLO 1 /* Hello */
#define OSPF_TYPE_DD 2 /* Database Description */
#define OSPF_TYPE_LS_REQ 3 /* Link State Request */
#define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */
#define OSPF_TYPE_LS_ACK 5 /* Link State Ack */
/* Options *_options */
#define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */
#define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */
#define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */
#define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */
#define OSPF6_OPTION_R 0x10 /* R bit: Router bit */
#define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */
/* The field is actually 24-bit (RFC5340 Section A.2). */
#define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */
#define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */
#define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */
/* db_flags */
#define OSPF6_DB_INIT 0x04 /* */
#define OSPF6_DB_MORE 0x02
#define OSPF6_DB_MASTER 0x01
#define OSPF6_DB_M6 0x10 /* IPv6 MTU */
/* ls_type */
#define LS_TYPE_ROUTER 1 /* router link */
#define LS_TYPE_NETWORK 2 /* network link */
#define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */
#define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */
#define LS_TYPE_ASE 5 /* ASE */
#define LS_TYPE_GROUP 6 /* Group membership */
#define LS_TYPE_NSSA 7 /* NSSA */
#define LS_TYPE_LINK 8 /* Link LSA */
#define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */
#define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */
#define LS_TYPE_GRACE 11 /* Grace LSA */
#define LS_TYPE_RI 12 /* Router information */
#define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */
#define LS_TYPE_L1VPN 14 /* L1VPN */
#define LS_TYPE_MASK 0x1fff
#define LS_SCOPE_LINKLOCAL 0x0000
#define LS_SCOPE_AREA 0x2000
#define LS_SCOPE_AS 0x4000
#define LS_SCOPE_MASK 0x6000
#define LS_SCOPE_U 0x8000
/* rla_link.link_type */
#define RLA_TYPE_ROUTER 1 /* point-to-point to another router */
#define RLA_TYPE_TRANSIT 2 /* connection to transit network */
#define RLA_TYPE_VIRTUAL 4 /* virtual link */
/* rla_flags */
#define RLA_FLAG_B 0x01
#define RLA_FLAG_E 0x02
#define RLA_FLAG_V 0x04
#define RLA_FLAG_W 0x08
#define RLA_FLAG_Nt 0x10
/* lsa_prefix options */
#define LSA_PREFIX_OPT_NU 0x01
#define LSA_PREFIX_OPT_LA 0x02
#define LSA_PREFIX_OPT_MC 0x04
#define LSA_PREFIX_OPT_P 0x08
#define LSA_PREFIX_OPT_DN 0x10
#define LSA_PREFIX_OPT_N 0x20
/* sla_tosmetric breakdown */
#define SLA_MASK_TOS 0x7f000000
#define SLA_MASK_METRIC 0x00ffffff
#define SLA_SHIFT_TOS 24
/* asla_metric */
#define ASLA_FLAG_FWDADDR 0x02000000
#define ASLA_FLAG_ROUTETAG 0x01000000
#define ASLA_MASK_METRIC 0x00ffffff
/* RFC6506 Section 4.1 */
#define OSPF6_AT_HDRLEN 16U
#define OSPF6_AUTH_TYPE_HMAC 0x0001
typedef nd_uint32_t rtrid_t;
/* link state advertisement header */
struct lsa6_hdr {
nd_uint16_t ls_age;
nd_uint16_t ls_type;
rtrid_t ls_stateid;
rtrid_t ls_router;
nd_uint32_t ls_seq;
nd_uint16_t ls_chksum;
nd_uint16_t ls_length;
};
/* Length of an IPv6 address, in bytes. */
#define IPV6_ADDR_LEN_BYTES (128/8)
struct lsa6_prefix {
nd_uint8_t lsa_p_len;
nd_uint8_t lsa_p_opt;
nd_uint16_t lsa_p_metric;
nd_byte lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */
};
/* link state advertisement */
struct lsa6 {
struct lsa6_hdr ls_hdr;
/* Link state types */
union {
/* Router links advertisements */
struct {
union {
nd_uint8_t flg;
nd_uint32_t opt;
} rla_flgandopt;
#define rla_flags rla_flgandopt.flg
#define rla_options rla_flgandopt.opt
struct rlalink6 {
nd_uint8_t link_type;
nd_byte link_zero;
nd_uint16_t link_metric;
nd_uint32_t link_ifid;
nd_uint32_t link_nifid;
rtrid_t link_nrtid;
} rla_link[1]; /* may repeat */
} un_rla;
/* Network links advertisements */
struct {
nd_uint32_t nla_options;
rtrid_t nla_router[1]; /* may repeat */
} un_nla;
/* Inter Area Prefix LSA */
struct {
nd_uint32_t inter_ap_metric;
struct lsa6_prefix inter_ap_prefix[1];
} un_inter_ap;
/* AS external links advertisements */
struct {
nd_uint32_t asla_metric;
struct lsa6_prefix asla_prefix[1];
/* some optional fields follow */
} un_asla;
#if 0
/* Summary links advertisements */
struct {
nd_ipv4 sla_mask;
nd_uint32_t sla_tosmetric[1]; /* may repeat */
} un_sla;
/* Multicast group membership */
struct mcla {
nd_uint32_t mcla_vtype;
nd_ipv4 mcla_vid;
} un_mcla[1];
#endif
/* Type 7 LSA */
/* Link LSA */
struct llsa {
union {
nd_uint8_t pri;
nd_uint32_t opt;
} llsa_priandopt;
#define llsa_priority llsa_priandopt.pri
#define llsa_options llsa_priandopt.opt
nd_ipv6 llsa_lladdr;
nd_uint32_t llsa_nprefix;
struct lsa6_prefix llsa_prefix[1];
} un_llsa;
/* Intra-Area-Prefix */
struct {
nd_uint16_t intra_ap_nprefix;
nd_uint16_t intra_ap_lstype;
rtrid_t intra_ap_lsid;
rtrid_t intra_ap_rtid;
struct lsa6_prefix intra_ap_prefix[1];
} un_intra_ap;
} lsa_un;
};
/*
* the main header
*/
struct ospf6hdr {
nd_uint8_t ospf6_version;
nd_uint8_t ospf6_type;
nd_uint16_t ospf6_len;
rtrid_t ospf6_routerid;
rtrid_t ospf6_areaid;
nd_uint16_t ospf6_chksum;
nd_uint8_t ospf6_instanceid;
nd_uint8_t ospf6_rsvd;
};
/*
* The OSPF6 header length is 16 bytes, regardless of how your compiler
* might choose to pad the above structure.
*/
#define OSPF6HDR_LEN 16
/* Hello packet */
struct hello6 {
nd_uint32_t hello_ifid;
union {
nd_uint8_t pri;
nd_uint32_t opt;
} hello_priandopt;
#define hello_priority hello_priandopt.pri
#define hello_options hello_priandopt.opt
nd_uint16_t hello_helloint;
nd_uint16_t hello_deadint;
rtrid_t hello_dr;
rtrid_t hello_bdr;
rtrid_t hello_neighbor[1]; /* may repeat */
};
/* Database Description packet */
struct dd6 {
nd_uint32_t db_options;
nd_uint16_t db_mtu;
nd_uint8_t db_mbz;
nd_uint8_t db_flags;
nd_uint32_t db_seq;
struct lsa6_hdr db_lshdr[1]; /* may repeat */
};
/* Link State Request */
struct lsr6 {
nd_uint16_t ls_mbz;
nd_uint16_t ls_type;
rtrid_t ls_stateid;
rtrid_t ls_router;
};
/* Link State Update */
struct lsu6 {
nd_uint32_t lsu_count;
struct lsa6 lsu_lsa[1]; /* may repeat */
};
static const struct tok ospf6_option_values[] = {
{ OSPF6_OPTION_V6, "V6" },
{ OSPF6_OPTION_E, "External" },
{ OSPF6_OPTION_MC, "Deprecated" },
{ OSPF6_OPTION_N, "NSSA" },
{ OSPF6_OPTION_R, "Router" },
{ OSPF6_OPTION_DC, "Demand Circuit" },
{ OSPF6_OPTION_AF, "AFs Support" },
{ OSPF6_OPTION_L, "LLS" },
{ OSPF6_OPTION_AT, "Authentication Trailer" },
{ 0, NULL }
};
static const struct tok ospf6_rla_flag_values[] = {
{ RLA_FLAG_B, "ABR" },
{ RLA_FLAG_E, "External" },
{ RLA_FLAG_V, "Virtual-Link Endpoint" },
{ RLA_FLAG_W, "Deprecated" },
{ RLA_FLAG_Nt, "NSSA Translator" },
{ 0, NULL }
};
static const struct tok ospf6_asla_flag_values[] = {
{ ASLA_FLAG_EXTERNAL, "External Type 2" },
{ ASLA_FLAG_FWDADDR, "Forwarding" },
{ ASLA_FLAG_ROUTETAG, "Tag" },
{ 0, NULL }
};
static const struct tok ospf6_type_values[] = {
{ 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 ospf6_lsa_values[] = {
{ LS_TYPE_ROUTER, "Router" },
{ LS_TYPE_NETWORK, "Network" },
{ LS_TYPE_INTER_AP, "Inter-Area Prefix" },
{ LS_TYPE_INTER_AR, "Inter-Area Router" },
{ LS_TYPE_ASE, "External" },
{ LS_TYPE_GROUP, "Deprecated" },
{ LS_TYPE_NSSA, "NSSA" },
{ LS_TYPE_LINK, "Link" },
{ LS_TYPE_INTRA_AP, "Intra-Area Prefix" },
{ LS_TYPE_INTRA_ATE, "Intra-Area TE" },
{ LS_TYPE_GRACE, "Grace" },
{ LS_TYPE_RI, "Router Information" },
{ LS_TYPE_INTER_ASTE, "Inter-AS-TE" },
{ LS_TYPE_L1VPN, "Layer 1 VPN" },
{ 0, NULL }
};
static const struct tok ospf6_ls_scope_values[] = {
{ LS_SCOPE_LINKLOCAL, "Link Local" },
{ LS_SCOPE_AREA, "Area Local" },
{ LS_SCOPE_AS, "Domain Wide" },
{ 0, NULL }
};
static const struct tok ospf6_dd_flag_values[] = {
{ OSPF6_DB_INIT, "Init" },
{ OSPF6_DB_MORE, "More" },
{ OSPF6_DB_MASTER, "Master" },
{ OSPF6_DB_M6, "IPv6 MTU" },
{ 0, NULL }
};
static const struct tok ospf6_lsa_prefix_option_values[] = {
{ LSA_PREFIX_OPT_NU, "No Unicast" },
{ LSA_PREFIX_OPT_LA, "Local address" },
{ LSA_PREFIX_OPT_MC, "Deprecated" },
{ LSA_PREFIX_OPT_P, "Propagate" },
{ LSA_PREFIX_OPT_DN, "Down" },
{ LSA_PREFIX_OPT_N, "N-bit" },
{ 0, NULL }
};
static const struct tok ospf6_auth_type_str[] = {
{ OSPF6_AUTH_TYPE_HMAC, "HMAC" },
{ 0, NULL }
};
static void
ospf6_print_ls_type(netdissect_options *ndo,
u_int ls_type, const rtrid_t *ls_stateid)
{
ND_PRINT("\n\t %s LSA (%u), %s Scope%s, LSA-ID %s",
tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK),
ls_type & LS_TYPE_MASK,
tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK),
ls_type &0x8000 ? ", transitive" : "", /* U-bit */
GET_IPADDR_STRING(ls_stateid));
}
static int
ospf6_print_lshdr(netdissect_options *ndo,
const struct lsa6_hdr *lshp, const u_char *dataend)
{
if ((const u_char *)(lshp + 1) > dataend)
goto trunc;
ND_PRINT("\n\t Advertising Router %s, seq 0x%08x, age %us, length %zu",
GET_IPADDR_STRING(lshp->ls_router),
GET_BE_U_4(lshp->ls_seq),
GET_BE_U_2(lshp->ls_age),
GET_BE_U_2(lshp->ls_length)-sizeof(struct lsa6_hdr));
ospf6_print_ls_type(ndo, GET_BE_U_2(lshp->ls_type),
&lshp->ls_stateid);
return (0);
trunc:
return (1);
}
static int
ospf6_print_lsaprefix(netdissect_options *ndo,
const uint8_t *tptr, u_int lsa_length)
{
const struct lsa6_prefix *lsapp = (const struct lsa6_prefix *)tptr;
u_int wordlen;
nd_ipv6 prefix;
if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES)
goto trunc;
lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES;
ND_TCHECK_LEN(lsapp, sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES);
wordlen = (GET_U_1(lsapp->lsa_p_len) + 31) / 32;
if (wordlen * 4 > sizeof(nd_ipv6)) {
ND_PRINT(" bogus prefixlen /%u", GET_U_1(lsapp->lsa_p_len));
goto trunc;
}
if (lsa_length < wordlen * 4)
goto trunc;
lsa_length -= wordlen * 4;
memset(prefix, 0, sizeof(prefix));
GET_CPY_BYTES(prefix, lsapp->lsa_p_prefix, wordlen * 4);
ND_PRINT("\n\t\t%s/%u", ip6addr_string(ndo, prefix), /* local buffer, not packet data; don't use GET_IP6ADDR_STRING() */
GET_U_1(lsapp->lsa_p_len));
if (GET_U_1(lsapp->lsa_p_opt)) {
ND_PRINT(", Options [%s]",
bittok2str(ospf6_lsa_prefix_option_values,
"none", GET_U_1(lsapp->lsa_p_opt)));
}
ND_PRINT(", metric %u", GET_BE_U_2(lsapp->lsa_p_metric));
return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4;
trunc:
return -1;
}
/*
* Print a single link state advertisement. If truncated return 1, else 0.
*/
static int
ospf6_print_lsa(netdissect_options *ndo,
const struct lsa6 *lsap, const u_char *dataend)
{
const struct rlalink6 *rlp;
#if 0
const struct tos_metric *tosp;
#endif
const rtrid_t *ap;
#if 0
const struct aslametric *almp;
const struct mcla *mcp;
#endif
const struct llsa *llsap;
const struct lsa6_prefix *lsapp;
#if 0
const uint32_t *lp;
#endif
u_int prefixes;
int bytelen;
u_int length, lsa_length;
uint32_t flags32;
const uint8_t *tptr;
if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend))
return (1);
length = GET_BE_U_2(lsap->ls_hdr.ls_length);
/*
* The LSA length includes the length of the header;
* it must have a value that's at least that length.
* If it does, find the length of what follows the
* header.
*/
if (length < sizeof(struct lsa6_hdr) || (const u_char *)lsap + length > dataend)
return (1);
lsa_length = length - sizeof(struct lsa6_hdr);
tptr = (const uint8_t *)lsap+sizeof(struct lsa6_hdr);
switch (GET_BE_U_2(lsap->ls_hdr.ls_type)) {
case LS_TYPE_ROUTER | LS_SCOPE_AREA:
if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options))
return (1);
lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options);
ND_PRINT("\n\t Options [%s]",
bittok2str(ospf6_option_values, "none",
GET_BE_U_4(lsap->lsa_un.un_rla.rla_options)));
ND_PRINT(", RLA-Flags [%s]",
bittok2str(ospf6_rla_flag_values, "none",
GET_U_1(lsap->lsa_un.un_rla.rla_flags)));
rlp = lsap->lsa_un.un_rla.rla_link;
while (lsa_length != 0) {
if (lsa_length < sizeof (*rlp))
return (1);
lsa_length -= sizeof (*rlp);
ND_TCHECK_SIZE(rlp);
switch (GET_U_1(rlp->link_type)) {
case RLA_TYPE_VIRTUAL:
ND_PRINT("\n\t Virtual Link: Neighbor Router-ID %s"
"\n\t Neighbor Interface-ID %s, Interface %s",
GET_IPADDR_STRING(rlp->link_nrtid),
GET_IPADDR_STRING(rlp->link_nifid),
GET_IPADDR_STRING(rlp->link_ifid));
break;
case RLA_TYPE_ROUTER:
ND_PRINT("\n\t Neighbor Router-ID %s"
"\n\t Neighbor Interface-ID %s, Interface %s",
GET_IPADDR_STRING(rlp->link_nrtid),
GET_IPADDR_STRING(rlp->link_nifid),
GET_IPADDR_STRING(rlp->link_ifid));
break;
case RLA_TYPE_TRANSIT:
ND_PRINT("\n\t Neighbor Network-ID %s"
"\n\t Neighbor Interface-ID %s, Interface %s",
GET_IPADDR_STRING(rlp->link_nrtid),
GET_IPADDR_STRING(rlp->link_nifid),
GET_IPADDR_STRING(rlp->link_ifid));
break;
default:
ND_PRINT("\n\t Unknown Router Links Type 0x%02x",
GET_U_1(rlp->link_type));
return (0);
}
ND_PRINT(", metric %u", GET_BE_U_2(rlp->link_metric));
rlp++;
}
break;
case LS_TYPE_NETWORK | LS_SCOPE_AREA:
if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options))
return (1);
lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options);
ND_PRINT("\n\t Options [%s]",
bittok2str(ospf6_option_values, "none",
GET_BE_U_4(lsap->lsa_un.un_nla.nla_options)));
ND_PRINT("\n\t Connected Routers:");
ap = lsap->lsa_un.un_nla.nla_router;
while (lsa_length != 0) {
if (lsa_length < sizeof (*ap))
return (1);
lsa_length -= sizeof (*ap);
ND_PRINT("\n\t\t%s", GET_IPADDR_STRING(ap));
++ap;
}
break;
case LS_TYPE_INTER_AP | LS_SCOPE_AREA:
if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric))
return (1);
lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric);
ND_PRINT(", metric %u",
GET_BE_U_4(lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC);
tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix;
while (lsa_length != 0) {
bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
if (bytelen < 0)
goto trunc;
/*
* ospf6_print_lsaprefix() will return -1 if
* the length is too high, so this will not
* underflow.
*/
lsa_length -= bytelen;
tptr += bytelen;
}
break;
case LS_TYPE_ASE | LS_SCOPE_AS:
if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric))
return (1);
lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric);
flags32 = GET_BE_U_4(lsap->lsa_un.un_asla.asla_metric);
ND_PRINT("\n\t Flags [%s]",
bittok2str(ospf6_asla_flag_values, "none", flags32));
ND_PRINT(" metric %u",
GET_BE_U_4(lsap->lsa_un.un_asla.asla_metric) &
ASLA_MASK_METRIC);
tptr = (const uint8_t *)lsap->lsa_un.un_asla.asla_prefix;
lsapp = (const struct lsa6_prefix *)tptr;
bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
if (bytelen < 0)
goto trunc;
/*
* ospf6_print_lsaprefix() will return -1 if
* the length is too high, so this will not
* underflow.
*/
lsa_length -= bytelen;
tptr += bytelen;
if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
if (lsa_length < sizeof (nd_ipv6))
return (1);
lsa_length -= sizeof (nd_ipv6);
ND_PRINT(" forward %s",
GET_IP6ADDR_STRING(tptr));
tptr += sizeof(nd_ipv6);
}
if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
if (lsa_length < sizeof (uint32_t))
return (1);
lsa_length -= sizeof (uint32_t);
ND_PRINT(" tag %s",
GET_IPADDR_STRING(tptr));
tptr += sizeof(uint32_t);
}
if (GET_U_1(lsapp->lsa_p_metric)) {
if (lsa_length < sizeof (uint32_t))
return (1);
lsa_length -= sizeof (uint32_t);
ND_PRINT(" RefLSID: %s",
GET_IPADDR_STRING(tptr));
tptr += sizeof(uint32_t);
}
break;
case LS_TYPE_LINK:
/* Link LSA */
llsap = &lsap->lsa_un.un_llsa;
if (lsa_length < sizeof (llsap->llsa_priandopt))
return (1);
lsa_length -= sizeof (llsap->llsa_priandopt);
ND_TCHECK_SIZE(&llsap->llsa_priandopt);
ND_PRINT("\n\t Options [%s]",
bittok2str(ospf6_option_values, "none",
GET_BE_U_4(llsap->llsa_options)));
if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix))
return (1);
lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix);
prefixes = GET_BE_U_4(llsap->llsa_nprefix);
ND_PRINT("\n\t Priority %u, Link-local address %s, Prefixes %u:",
GET_U_1(llsap->llsa_priority),
GET_IP6ADDR_STRING(llsap->llsa_lladdr),
prefixes);
tptr = (const uint8_t *)llsap->llsa_prefix;
while (prefixes > 0) {
bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
if (bytelen < 0)
goto trunc;
prefixes--;
/*
* ospf6_print_lsaprefix() will return -1 if
* the length is too high, so this will not
* underflow.
*/
lsa_length -= bytelen;
tptr += bytelen;
}
break;
case LS_TYPE_INTRA_AP | LS_SCOPE_AREA:
/* Intra-Area-Prefix LSA */
if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid))
return (1);
lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid);
ND_TCHECK_4(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
ospf6_print_ls_type(ndo,
GET_BE_U_2(lsap->lsa_un.un_intra_ap.intra_ap_lstype),
&lsap->lsa_un.un_intra_ap.intra_ap_lsid);
if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix))
return (1);
lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
prefixes = GET_BE_U_2(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
ND_PRINT("\n\t Prefixes %u:", prefixes);
tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
while (prefixes > 0) {
bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
if (bytelen < 0)
goto trunc;
prefixes--;
/*
* ospf6_print_lsaprefix() will return -1 if
* the length is too high, so this will not
* underflow.
*/
lsa_length -= bytelen;
tptr += bytelen;
}
break;
case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
if (ospf_grace_lsa_print(ndo, tptr, lsa_length) == -1) {
return 1;
}
break;
case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
if (ospf_te_lsa_print(ndo, tptr, lsa_length) == -1) {
return 1;
}
break;
default:
if(!print_unknown_data(ndo,tptr,
"\n\t ",
lsa_length)) {
return (1);
}
break;
}
return (0);
trunc:
return (1);
}
static int
ospf6_decode_v3(netdissect_options *ndo,
const struct ospf6hdr *op,
const u_char *dataend)
{
const rtrid_t *ap;
const struct lsr6 *lsrp;
const struct lsa6_hdr *lshp;
const struct lsa6 *lsap;
int i;
switch (GET_U_1(op->ospf6_type)) {
case OSPF_TYPE_HELLO: {
const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
ND_PRINT("\n\tOptions [%s]",
bittok2str(ospf6_option_values, "none",
GET_BE_U_4(hellop->hello_options)));
ND_PRINT("\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
GET_BE_U_2(hellop->hello_helloint),
GET_BE_U_2(hellop->hello_deadint),
GET_IPADDR_STRING(hellop->hello_ifid),
GET_U_1(hellop->hello_priority));
if (GET_BE_U_4(hellop->hello_dr) != 0)
ND_PRINT("\n\t Designated Router %s",
GET_IPADDR_STRING(hellop->hello_dr));
if (GET_BE_U_4(hellop->hello_bdr) != 0)
ND_PRINT(", Backup Designated Router %s",
GET_IPADDR_STRING(hellop->hello_bdr));
if (ndo->ndo_vflag > 1) {
ND_PRINT("\n\t Neighbor List:");
ap = hellop->hello_neighbor;
while ((const u_char *)ap < dataend) {
ND_PRINT("\n\t %s", GET_IPADDR_STRING(ap));
++ap;
}
}
break; /* HELLO */
}
case OSPF_TYPE_DD: {
const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
ND_PRINT("\n\tOptions [%s]",
bittok2str(ospf6_option_values, "none",
GET_BE_U_4(ddp->db_options)));
ND_PRINT(", DD Flags [%s]",
bittok2str(ospf6_dd_flag_values,"none",GET_U_1(ddp->db_flags)));
ND_PRINT(", MTU %u, DD-Sequence 0x%08x",
GET_BE_U_2(ddp->db_mtu),
GET_BE_U_4(ddp->db_seq));
if (ndo->ndo_vflag > 1) {
/* Print all the LS adv's */
lshp = ddp->db_lshdr;
while ((const u_char *)lshp < dataend) {
if (ospf6_print_lshdr(ndo, lshp++, dataend))
goto trunc;
}
}
break;
}
case OSPF_TYPE_LS_REQ:
if (ndo->ndo_vflag > 1) {
lsrp = (const struct lsr6 *)((const uint8_t *)op + OSPF6HDR_LEN);
while ((const u_char *)lsrp < dataend) {
ND_TCHECK_SIZE(lsrp);
ND_PRINT("\n\t Advertising Router %s",
GET_IPADDR_STRING(lsrp->ls_router));
ospf6_print_ls_type(ndo,
GET_BE_U_2(lsrp->ls_type),
&lsrp->ls_stateid);
++lsrp;
}
}
break;
case OSPF_TYPE_LS_UPDATE:
if (ndo->ndo_vflag > 1) {
const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN);
i = GET_BE_U_4(lsup->lsu_count);
lsap = lsup->lsu_lsa;
while ((const u_char *)lsap < dataend && i--) {
if (ospf6_print_lsa(ndo, lsap, dataend))
goto trunc;
lsap = (const struct lsa6 *)((const u_char *)lsap +
GET_BE_U_2(lsap->ls_hdr.ls_length));
}
}
break;
case OSPF_TYPE_LS_ACK:
if (ndo->ndo_vflag > 1) {
lshp = (const struct lsa6_hdr *)((const uint8_t *)op + OSPF6HDR_LEN);
while ((const u_char *)lshp < dataend) {
if (ospf6_print_lshdr(ndo, lshp++, dataend))
goto trunc;
}
}
break;
default:
break;
}
return (0);
trunc:
return (1);
}
/* RFC5613 Section 2.2 (w/o the TLVs) */
static int
ospf6_print_lls(netdissect_options *ndo,
const u_char *cp, const u_int len)
{
uint16_t llsdatalen;
if (len == 0)
return 0;
if (len < OSPF_LLS_HDRLEN)
goto trunc;
/* Checksum */
ND_PRINT("\n\tLLS Checksum 0x%04x", GET_BE_U_2(cp));
cp += 2;
/* LLS Data Length */
llsdatalen = GET_BE_U_2(cp);
ND_PRINT(", Data Length %u", llsdatalen);
if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
goto trunc;
cp += 2;
/* LLS TLVs */
ND_TCHECK_LEN(cp, llsdatalen - OSPF_LLS_HDRLEN);
/* FIXME: code in print-ospf.c can be reused to decode the TLVs */
return llsdatalen;
trunc:
return -1;
}
/* RFC6506 Section 4.1 */
static int
ospf6_decode_at(netdissect_options *ndo,
const u_char *cp, const u_int len)
{
uint16_t authdatalen;
if (len == 0)
return 0;
if (len < OSPF6_AT_HDRLEN)
goto trunc;
/* Authentication Type */
ND_PRINT("\n\tAuthentication Type %s",
tok2str(ospf6_auth_type_str, "unknown (0x%04x)", GET_BE_U_2(cp)));
cp += 2;
/* Auth Data Len */
authdatalen = GET_BE_U_2(cp);
ND_PRINT(", Length %u", authdatalen);
if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
goto trunc;
cp += 2;
/* Reserved */
cp += 2;
/* Security Association ID */
ND_PRINT(", SAID %u", GET_BE_U_2(cp));
cp += 2;
/* Cryptographic Sequence Number (High-Order 32 Bits) */
ND_PRINT(", CSN 0x%08x", GET_BE_U_4(cp));
cp += 4;
/* Cryptographic Sequence Number (Low-Order 32 Bits) */
ND_PRINT(":%08x", GET_BE_U_4(cp));
cp += 4;
/* Authentication Data */
ND_TCHECK_LEN(cp, authdatalen - OSPF6_AT_HDRLEN);
if (ndo->ndo_vflag > 1)
print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN);
return 0;
trunc:
return 1;
}
/* The trailing data may include LLS and/or AT data (in this specific order).
* LLS data may be present only in Hello and DBDesc packets with the L-bit set.
* AT data may be present in Hello and DBDesc packets with the AT-bit set or in
* any other packet type, thus decode the AT data regardless of the AT-bit.
*/
static int
ospf6_decode_v3_trailer(netdissect_options *ndo,
const struct ospf6hdr *op, const u_char *cp, const unsigned len)
{
uint8_t type;
int llslen = 0;
int lls_hello = 0;
int lls_dd = 0;
type = GET_U_1(op->ospf6_type);
if (type == OSPF_TYPE_HELLO) {
const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
if (GET_BE_U_4(hellop->hello_options) & OSPF6_OPTION_L)
lls_hello = 1;
} else if (type == OSPF_TYPE_DD) {
const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
if (GET_BE_U_4(ddp->db_options) & OSPF6_OPTION_L)
lls_dd = 1;
}
if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0)
goto trunc;
return ospf6_decode_at(ndo, cp + llslen, len - llslen);
trunc:
return 1;
}
void
ospf6_print(netdissect_options *ndo,
const u_char *bp, u_int length)
{
const struct ospf6hdr *op;
const u_char *dataend;
const char *cp;
uint16_t datalen;
ndo->ndo_protocol = "ospf3";
op = (const struct ospf6hdr *)bp;
/* If the type is valid translate it, or just print the type */
/* value. If it's not valid, say so and return */
cp = tok2str(ospf6_type_values, "unknown packet type (%u)",
GET_U_1(op->ospf6_type));
ND_PRINT("OSPFv%u, %s, length %u", GET_U_1(op->ospf6_version), cp,
length);
if (*cp == 'u') {
return;
}
if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
return;
}
/* OSPFv3 data always comes first and optional trailing data may follow. */
datalen = GET_BE_U_2(op->ospf6_len);
if (datalen > length) {
ND_PRINT(" [len %u]", datalen);
return;
}
dataend = bp + datalen;
ND_PRINT("\n\tRouter-ID %s", GET_IPADDR_STRING(op->ospf6_routerid));
if (GET_BE_U_4(op->ospf6_areaid) != 0)
ND_PRINT(", Area %s", GET_IPADDR_STRING(op->ospf6_areaid));
else
ND_PRINT(", Backbone Area");
if (GET_U_1(op->ospf6_instanceid))
ND_PRINT(", Instance %u", GET_U_1(op->ospf6_instanceid));
/* Do rest according to version. */
switch (GET_U_1(op->ospf6_version)) {
case 3:
/* ospf version 3 */
if (ospf6_decode_v3(ndo, op, dataend) ||
ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen))
goto trunc;
break;
} /* end switch on version */
return;
trunc:
nd_print_trunc(ndo);
}
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