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5cea270318
tcpdump/print-ospf6.c
Francois-Xavier Le Bail 5cea270318 Remove all storage class specifier 'register' 
Let the compiler do the optimizations (or not) based on build options.

Avoid 'value has been optimized out' messages in gdb using '-O0'.
2017-12-13 19:17:47 +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_N 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
/* 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 uint32_t rtrid_t;
/* link state advertisement header */
struct lsa6_hdr {
uint16_t ls_age;
uint16_t ls_type;
rtrid_t ls_stateid;
rtrid_t ls_router;
uint32_t ls_seq;
uint16_t ls_chksum;
uint16_t ls_length;
};
/* Length of an IPv6 address, in bytes. */
#define IPV6_ADDR_LEN_BYTES (128/8)
struct lsa6_prefix {
uint8_t lsa_p_len;
uint8_t lsa_p_opt;
uint16_t lsa_p_metric;
uint8_t 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 {
uint8_t flg;
uint32_t opt;
} rla_flgandopt;
#define rla_flags rla_flgandopt.flg
#define rla_options rla_flgandopt.opt
struct rlalink6 {
uint8_t link_type;
uint8_t link_zero[1];
uint16_t link_metric;
uint32_t link_ifid;
uint32_t link_nifid;
rtrid_t link_nrtid;
} rla_link[1]; /* may repeat */
} un_rla;
/* Network links advertisements */
struct {
uint32_t nla_options;
rtrid_t nla_router[1]; /* may repeat */
} un_nla;
/* Inter Area Prefix LSA */
struct {
uint32_t inter_ap_metric;
struct lsa6_prefix inter_ap_prefix[1];
} un_inter_ap;
/* AS external links advertisements */
struct {
uint32_t asla_metric;
struct lsa6_prefix asla_prefix[1];
/* some optional fields follow */
} un_asla;
#if 0
/* Summary links advertisements */
struct {
struct in_addr sla_mask;
uint32_t sla_tosmetric[1]; /* may repeat */
} un_sla;
/* Multicast group membership */
struct mcla {
uint32_t mcla_vtype;
struct in_addr mcla_vid;
} un_mcla[1];
#endif
/* Type 7 LSA */
/* Link LSA */
struct llsa {
union {
uint8_t pri;
uint32_t opt;
} llsa_priandopt;
#define llsa_priority llsa_priandopt.pri
#define llsa_options llsa_priandopt.opt
struct in6_addr llsa_lladdr;
uint32_t llsa_nprefix;
struct lsa6_prefix llsa_prefix[1];
} un_llsa;
/* Intra-Area-Prefix */
struct {
uint16_t intra_ap_nprefix;
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 {
uint8_t ospf6_version;
uint8_t ospf6_type;
uint16_t ospf6_len;
rtrid_t ospf6_routerid;
rtrid_t ospf6_areaid;
uint16_t ospf6_chksum;
uint8_t ospf6_instanceid;
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 {
uint32_t hello_ifid;
union {
uint8_t pri;
uint32_t opt;
} hello_priandopt;
#define hello_priority hello_priandopt.pri
#define hello_options hello_priandopt.opt
uint16_t hello_helloint;
uint16_t hello_deadint;
rtrid_t hello_dr;
rtrid_t hello_bdr;
rtrid_t hello_neighbor[1]; /* may repeat */
};
/* Database Description packet */
struct dd6 {
uint32_t db_options;
uint16_t db_mtu;
uint8_t db_mbz;
uint8_t db_flags;
uint32_t db_seq;
struct lsa6_hdr db_lshdr[1]; /* may repeat */
};
/* Link State Request */
struct lsr6 {
uint16_t ls_mbz;
uint16_t ls_type;
rtrid_t ls_stateid;
rtrid_t ls_router;
};
/* Link State Update */
struct lsu6 {
uint32_t lsu_count;
struct lsa6 lsu_lsa[1]; /* may repeat */
};
static const char tstr[] = " [|ospf3]";
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, "Wildcard Receiver" },
{ RLA_FLAG_N, "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" },
{ 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((ndo, "\n\t %s LSA (%d), %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 */
ipaddr_string(ndo, 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_TCHECK(lshp->ls_type);
ND_TCHECK(lshp->ls_seq);
ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
ipaddr_string(ndo, &lshp->ls_router),
EXTRACT_BE_U_4(&lshp->ls_seq),
EXTRACT_BE_U_2(&lshp->ls_age),
EXTRACT_BE_U_2(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr)));
ospf6_print_ls_type(ndo, EXTRACT_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;
struct in6_addr 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 = (lsapp->lsa_p_len + 31) / 32;
if (wordlen * 4 > sizeof(struct in6_addr)) {
ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len));
goto trunc;
}
if (lsa_length < wordlen * 4)
goto trunc;
lsa_length -= wordlen * 4;
ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4);
memset(&prefix, 0, sizeof(prefix));
memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4);
ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix),
lsapp->lsa_p_len));
if (lsapp->lsa_p_opt) {
ND_PRINT((ndo, ", Options [%s]",
bittok2str(ospf6_lsa_prefix_option_values,
"none", lsapp->lsa_p_opt)));
}
ND_PRINT((ndo, ", metric %u", EXTRACT_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);
ND_TCHECK(lsap->ls_hdr.ls_length);
length = EXTRACT_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 (EXTRACT_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_TCHECK(lsap->lsa_un.un_rla.rla_options);
ND_PRINT((ndo, "\n\t Options [%s]",
bittok2str(ospf6_option_values, "none",
EXTRACT_BE_U_4(&lsap->lsa_un.un_rla.rla_options))));
ND_PRINT((ndo, ", RLA-Flags [%s]",
bittok2str(ospf6_rla_flag_values, "none",
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(*rlp);
switch (rlp->link_type) {
case RLA_TYPE_VIRTUAL:
ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID %s"
"\n\t Neighbor Interface-ID %s, Interface %s",
ipaddr_string(ndo, &rlp->link_nrtid),
ipaddr_string(ndo, &rlp->link_nifid),
ipaddr_string(ndo, &rlp->link_ifid)));
break;
case RLA_TYPE_ROUTER:
ND_PRINT((ndo, "\n\t Neighbor Router-ID %s"
"\n\t Neighbor Interface-ID %s, Interface %s",
ipaddr_string(ndo, &rlp->link_nrtid),
ipaddr_string(ndo, &rlp->link_nifid),
ipaddr_string(ndo, &rlp->link_ifid)));
break;
case RLA_TYPE_TRANSIT:
ND_PRINT((ndo, "\n\t Neighbor Network-ID %s"
"\n\t Neighbor Interface-ID %s, Interface %s",
ipaddr_string(ndo, &rlp->link_nrtid),
ipaddr_string(ndo, &rlp->link_nifid),
ipaddr_string(ndo, &rlp->link_ifid)));
break;
default:
ND_PRINT((ndo, "\n\t Unknown Router Links Type 0x%02x",
rlp->link_type));
return (0);
}
ND_PRINT((ndo, ", metric %d", EXTRACT_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_TCHECK(lsap->lsa_un.un_nla.nla_options);
ND_PRINT((ndo, "\n\t Options [%s]",
bittok2str(ospf6_option_values, "none",
EXTRACT_BE_U_4(&lsap->lsa_un.un_nla.nla_options))));
ND_PRINT((ndo, "\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_TCHECK(*ap);
ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, 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_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric);
ND_PRINT((ndo, ", metric %u",
EXTRACT_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;
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);
ND_TCHECK(lsap->lsa_un.un_asla.asla_metric);
flags32 = EXTRACT_BE_U_4(&lsap->lsa_un.un_asla.asla_metric);
ND_PRINT((ndo, "\n\t Flags [%s]",
bittok2str(ospf6_asla_flag_values, "none", flags32)));
ND_PRINT((ndo, " metric %u",
EXTRACT_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;
lsa_length -= bytelen;
tptr += bytelen;
if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
const struct in6_addr *fwdaddr6;
fwdaddr6 = (const struct in6_addr *)tptr;
if (lsa_length < sizeof (*fwdaddr6))
return (1);
lsa_length -= sizeof (*fwdaddr6);
ND_TCHECK(*fwdaddr6);
ND_PRINT((ndo, " forward %s",
ip6addr_string(ndo, fwdaddr6)));
tptr += sizeof(*fwdaddr6);
}
if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
if (lsa_length < sizeof (uint32_t))
return (1);
lsa_length -= sizeof (uint32_t);
ND_TCHECK(*(const uint32_t *)tptr);
ND_PRINT((ndo, " tag %s",
ipaddr_string(ndo, (const uint32_t *)tptr)));
tptr += sizeof(uint32_t);
}
if (lsapp->lsa_p_metric) {
if (lsa_length < sizeof (uint32_t))
return (1);
lsa_length -= sizeof (uint32_t);
ND_TCHECK(*(const uint32_t *)tptr);
ND_PRINT((ndo, " RefLSID: %s",
ipaddr_string(ndo, (const uint32_t *)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(llsap->llsa_priandopt);
ND_PRINT((ndo, "\n\t Options [%s]",
bittok2str(ospf6_option_values, "none",
EXTRACT_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);
ND_TCHECK(llsap->llsa_nprefix);
prefixes = EXTRACT_BE_U_4(&llsap->llsa_nprefix);
ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:",
llsap->llsa_priority,
ip6addr_string(ndo, &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--;
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(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
ospf6_print_ls_type(ndo,
EXTRACT_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);
ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
prefixes = EXTRACT_BE_U_2(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
ND_PRINT((ndo, "\n\t Prefixes %d:", 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--;
lsa_length -= bytelen;
tptr += bytelen;
}
break;
case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) {
return 1;
}
break;
case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
if (ospf_print_te_lsa(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 (op->ospf6_type) {
case OSPF_TYPE_HELLO: {
const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
ND_TCHECK_4(&hellop->hello_options);
ND_PRINT((ndo, "\n\tOptions [%s]",
bittok2str(ospf6_option_values, "none",
EXTRACT_BE_U_4(&hellop->hello_options))));
ND_TCHECK(hellop->hello_deadint);
ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
EXTRACT_BE_U_2(&hellop->hello_helloint),
EXTRACT_BE_U_2(&hellop->hello_deadint),
ipaddr_string(ndo, &hellop->hello_ifid),
hellop->hello_priority));
ND_TCHECK(hellop->hello_dr);
if (EXTRACT_BE_U_4(&hellop->hello_dr) != 0)
ND_PRINT((ndo, "\n\t Designated Router %s",
ipaddr_string(ndo, &hellop->hello_dr)));
ND_TCHECK(hellop->hello_bdr);
if (EXTRACT_BE_U_4(&hellop->hello_bdr) != 0)
ND_PRINT((ndo, ", Backup Designated Router %s",
ipaddr_string(ndo, &hellop->hello_bdr)));
if (ndo->ndo_vflag > 1) {
ND_PRINT((ndo, "\n\t Neighbor List:"));
ap = hellop->hello_neighbor;
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: {
const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
ND_TCHECK(ddp->db_options);
ND_PRINT((ndo, "\n\tOptions [%s]",
bittok2str(ospf6_option_values, "none",
EXTRACT_BE_U_4(&ddp->db_options))));
ND_TCHECK(ddp->db_flags);
ND_PRINT((ndo, ", DD Flags [%s]",
bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags)));
ND_TCHECK(ddp->db_seq);
ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x",
EXTRACT_BE_U_2(&ddp->db_mtu),
EXTRACT_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(*lsrp);
ND_PRINT((ndo, "\n\t Advertising Router %s",
ipaddr_string(ndo, &lsrp->ls_router)));
ospf6_print_ls_type(ndo,
EXTRACT_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);
ND_TCHECK(lsup->lsu_count);
i = EXTRACT_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 +
EXTRACT_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_TCHECK_2(cp);
ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_BE_U_2(cp)));
cp += 2;
/* LLS Data Length */
ND_TCHECK_2(cp);
llsdatalen = EXTRACT_BE_U_2(cp);
ND_PRINT((ndo, ", 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_TCHECK_2(cp);
ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_BE_U_2(cp))));
cp += 2;
/* Auth Data Len */
ND_TCHECK_2(cp);
authdatalen = EXTRACT_BE_U_2(cp);
ND_PRINT((ndo, ", Length %u", authdatalen));
if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
goto trunc;
cp += 2;
/* Reserved */
ND_TCHECK_2(cp);
cp += 2;
/* Security Association ID */
ND_TCHECK_2(cp);
ND_PRINT((ndo, ", SAID %u", EXTRACT_BE_U_2(cp)));
cp += 2;
/* Cryptographic Sequence Number (High-Order 32 Bits) */
ND_TCHECK_4(cp);
ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_BE_U_4(cp)));
cp += 4;
/* Cryptographic Sequence Number (Low-Order 32 Bits) */
ND_TCHECK_4(cp);
ND_PRINT((ndo, ":%08x", EXTRACT_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)
{
int llslen = 0;
int lls_hello = 0;
int lls_dd = 0;
if (op->ospf6_type == OSPF_TYPE_HELLO) {
const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
ND_TCHECK(hellop->hello_options);
if (EXTRACT_BE_U_4(&hellop->hello_options) & OSPF6_OPTION_L)
lls_hello = 1;
} else if (op->ospf6_type == OSPF_TYPE_DD) {
const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
ND_TCHECK(ddp->db_options);
if (EXTRACT_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;
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 */
ND_TCHECK(op->ospf6_type);
cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type);
ND_PRINT((ndo, "OSPFv%u, %s, length %d", 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. */
ND_TCHECK(op->ospf6_len);
datalen = EXTRACT_BE_U_2(&op->ospf6_len);
if (datalen > length) {
ND_PRINT((ndo, " [len %d]", datalen));
return;
}
dataend = bp + datalen;
ND_TCHECK(op->ospf6_routerid);
ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf6_routerid)));
ND_TCHECK(op->ospf6_areaid);
if (EXTRACT_BE_U_4(&op->ospf6_areaid) != 0)
ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf6_areaid)));
else
ND_PRINT((ndo, ", Backbone Area"));
ND_TCHECK(op->ospf6_instanceid);
if (op->ospf6_instanceid)
ND_PRINT((ndo, ", Instance %u", op->ospf6_instanceid));
/* Do rest according to version. */
switch (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((ndo, "%s", tstr));
}
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