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3f5693a2bb
tcpdump/print-aodv.c
Guy Harris 3f5693a2bb Report a too-long unreachable destination list. 
Running out of packet length before running out of unreachable
destinations is an error; report it as such.

Don't worry about leftover data past the end of the list of unreachable
destinations.
2014-11-12 01:09:27 -08:00

586 lines
17 KiB
C
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/*
* Copyright (c) 2003 Bruce M. Simpson <bms@spc.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Bruce M. Simpson.
* 4. Neither the name of Bruce M. Simpson nor the names of co-
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bruce M. Simpson AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Bruce M. Simpson OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
struct aodv_rreq {
uint8_t rreq_type; /* AODV message type (1) */
uint8_t rreq_flags; /* various flags */
uint8_t rreq_zero0; /* reserved, set to zero */
uint8_t rreq_hops; /* number of hops from originator */
uint32_t rreq_id; /* request ID */
uint32_t rreq_da; /* destination IPv4 address */
uint32_t rreq_ds; /* destination sequence number */
uint32_t rreq_oa; /* originator IPv4 address */
uint32_t rreq_os; /* originator sequence number */
};
#ifdef INET6
struct aodv_rreq6 {
uint8_t rreq_type; /* AODV message type (1) */
uint8_t rreq_flags; /* various flags */
uint8_t rreq_zero0; /* reserved, set to zero */
uint8_t rreq_hops; /* number of hops from originator */
uint32_t rreq_id; /* request ID */
struct in6_addr rreq_da; /* destination IPv6 address */
uint32_t rreq_ds; /* destination sequence number */
struct in6_addr rreq_oa; /* originator IPv6 address */
uint32_t rreq_os; /* originator sequence number */
};
struct aodv_rreq6_draft_01 {
uint8_t rreq_type; /* AODV message type (16) */
uint8_t rreq_flags; /* various flags */
uint8_t rreq_zero0; /* reserved, set to zero */
uint8_t rreq_hops; /* number of hops from originator */
uint32_t rreq_id; /* request ID */
uint32_t rreq_ds; /* destination sequence number */
uint32_t rreq_os; /* originator sequence number */
struct in6_addr rreq_da; /* destination IPv6 address */
struct in6_addr rreq_oa; /* originator IPv6 address */
};
#endif
#define RREQ_JOIN 0x80 /* join (reserved for multicast */
#define RREQ_REPAIR 0x40 /* repair (reserved for multicast */
#define RREQ_GRAT 0x20 /* gratuitous RREP */
#define RREQ_DEST 0x10 /* destination only */
#define RREQ_UNKNOWN 0x08 /* unknown destination sequence num */
#define RREQ_FLAGS_MASK 0xF8 /* mask for rreq_flags */
struct aodv_rrep {
uint8_t rrep_type; /* AODV message type (2) */
uint8_t rrep_flags; /* various flags */
uint8_t rrep_ps; /* prefix size */
uint8_t rrep_hops; /* number of hops from o to d */
uint32_t rrep_da; /* destination IPv4 address */
uint32_t rrep_ds; /* destination sequence number */
uint32_t rrep_oa; /* originator IPv4 address */
uint32_t rrep_life; /* lifetime of this route */
};
#ifdef INET6
struct aodv_rrep6 {
uint8_t rrep_type; /* AODV message type (2) */
uint8_t rrep_flags; /* various flags */
uint8_t rrep_ps; /* prefix size */
uint8_t rrep_hops; /* number of hops from o to d */
struct in6_addr rrep_da; /* destination IPv6 address */
uint32_t rrep_ds; /* destination sequence number */
struct in6_addr rrep_oa; /* originator IPv6 address */
uint32_t rrep_life; /* lifetime of this route */
};
struct aodv_rrep6_draft_01 {
uint8_t rrep_type; /* AODV message type (17) */
uint8_t rrep_flags; /* various flags */
uint8_t rrep_ps; /* prefix size */
uint8_t rrep_hops; /* number of hops from o to d */
uint32_t rrep_ds; /* destination sequence number */
struct in6_addr rrep_da; /* destination IPv6 address */
struct in6_addr rrep_oa; /* originator IPv6 address */
uint32_t rrep_life; /* lifetime of this route */
};
#endif
#define RREP_REPAIR 0x80 /* repair (reserved for multicast */
#define RREP_ACK 0x40 /* acknowledgement required */
#define RREP_FLAGS_MASK 0xC0 /* mask for rrep_flags */
#define RREP_PREFIX_MASK 0x1F /* mask for prefix size */
struct rerr_unreach {
uint32_t u_da; /* IPv4 address */
uint32_t u_ds; /* sequence number */
};
#ifdef INET6
struct rerr_unreach6 {
struct in6_addr u_da; /* IPv6 address */
uint32_t u_ds; /* sequence number */
};
struct rerr_unreach6_draft_01 {
struct in6_addr u_da; /* IPv6 address */
uint32_t u_ds; /* sequence number */
};
#endif
struct aodv_rerr {
uint8_t rerr_type; /* AODV message type (3 or 18) */
uint8_t rerr_flags; /* various flags */
uint8_t rerr_zero0; /* reserved, set to zero */
uint8_t rerr_dc; /* destination count */
};
#define RERR_NODELETE 0x80 /* don't delete the link */
#define RERR_FLAGS_MASK 0x80 /* mask for rerr_flags */
struct aodv_rrep_ack {
uint8_t ra_type;
uint8_t ra_zero0;
};
#define AODV_RREQ 1 /* route request */
#define AODV_RREP 2 /* route response */
#define AODV_RERR 3 /* error report */
#define AODV_RREP_ACK 4 /* route response acknowledgement */
#define AODV_V6_DRAFT_01_RREQ 16 /* IPv6 route request */
#define AODV_V6_DRAFT_01_RREP 17 /* IPv6 route response */
#define AODV_V6_DRAFT_01_RERR 18 /* IPv6 error report */
#define AODV_V6_DRAFT_01_RREP_ACK 19 /* IPV6 route response acknowledgment */
struct aodv_ext {
uint8_t type; /* extension type */
uint8_t length; /* extension length */
};
struct aodv_hello {
struct aodv_ext eh; /* extension header */
uint8_t interval[4]; /* expect my next hello in
* (n) ms
* NOTE: this is not aligned */
};
#define AODV_EXT_HELLO 1
static void
aodv_extension(netdissect_options *ndo,
const struct aodv_ext *ep, u_int length)
{
const struct aodv_hello *ah;
switch (ep->type) {
case AODV_EXT_HELLO:
ah = (const struct aodv_hello *)(const void *)ep;
ND_TCHECK(*ah);
if (length < sizeof(struct aodv_hello))
goto trunc;
ND_PRINT((ndo, "\n\text HELLO %ld ms",
(unsigned long)EXTRACT_32BITS(&ah->interval)));
break;
default:
ND_PRINT((ndo, "\n\text %u %u", ep->type, ep->length));
break;
}
return;
trunc:
ND_PRINT((ndo, " [|hello]"));
}
static void
aodv_rreq(netdissect_options *ndo, const u_char *dat, u_int length)
{
u_int i;
const struct aodv_rreq *ap = (const struct aodv_rreq *)dat;
ND_TCHECK(*ap);
if (length < sizeof(*ap))
goto trunc;
ND_PRINT((ndo, " rreq %u %s%s%s%s%shops %u id 0x%08lx\n"
"\tdst %s seq %lu src %s seq %lu", length,
ap->rreq_type & RREQ_JOIN ? "[J]" : "",
ap->rreq_type & RREQ_REPAIR ? "[R]" : "",
ap->rreq_type & RREQ_GRAT ? "[G]" : "",
ap->rreq_type & RREQ_DEST ? "[D]" : "",
ap->rreq_type & RREQ_UNKNOWN ? "[U] " : " ",
ap->rreq_hops,
(unsigned long)EXTRACT_32BITS(&ap->rreq_id),
ipaddr_string(ndo, &ap->rreq_da),
(unsigned long)EXTRACT_32BITS(&ap->rreq_ds),
ipaddr_string(ndo, &ap->rreq_oa),
(unsigned long)EXTRACT_32BITS(&ap->rreq_os)));
i = length - sizeof(*ap);
if (i >= sizeof(struct aodv_ext))
aodv_extension(ndo, (const struct aodv_ext *)(dat + sizeof(*ap)), i);
return;
trunc:
ND_PRINT((ndo, " [|rreq"));
}
static void
aodv_rrep(netdissect_options *ndo, const u_char *dat, u_int length)
{
u_int i;
const struct aodv_rrep *ap = (const struct aodv_rrep *)dat;
ND_TCHECK(*ap);
if (length < sizeof(*ap))
goto trunc;
ND_PRINT((ndo, " rrep %u %s%sprefix %u hops %u\n"
"\tdst %s dseq %lu src %s %lu ms", length,
ap->rrep_type & RREP_REPAIR ? "[R]" : "",
ap->rrep_type & RREP_ACK ? "[A] " : " ",
ap->rrep_ps & RREP_PREFIX_MASK,
ap->rrep_hops,
ipaddr_string(ndo, &ap->rrep_da),
(unsigned long)EXTRACT_32BITS(&ap->rrep_ds),
ipaddr_string(ndo, &ap->rrep_oa),
(unsigned long)EXTRACT_32BITS(&ap->rrep_life)));
i = length - sizeof(*ap);
if (i >= sizeof(struct aodv_ext))
aodv_extension(ndo, (const struct aodv_ext *)(dat + sizeof(*ap)), i);
return;
trunc:
ND_PRINT((ndo, " [|rreq"));
}
static void
aodv_rerr(netdissect_options *ndo, const u_char *dat, u_int length)
{
u_int i, dc;
const struct aodv_rerr *ap = (const struct aodv_rerr *)dat;
const struct rerr_unreach *dp;
ND_TCHECK(*ap);
if (length < sizeof(*ap))
goto trunc;
ND_PRINT((ndo, " rerr %s [items %u] [%u]:",
ap->rerr_flags & RERR_NODELETE ? "[D]" : "",
ap->rerr_dc, length));
dp = (struct rerr_unreach *)(dat + sizeof(*ap));
i = length - sizeof(*ap);
for (dc = ap->rerr_dc; dc != 0; dc--) {
ND_TCHECK(*dp);
if (i < sizeof(*dp))
goto trunc;
ND_PRINT((ndo, " {%s}(%ld)", ipaddr_string(ndo, &dp->u_da),
(unsigned long)EXTRACT_32BITS(&dp->u_ds)));
dp++;
i -= sizeof(*dp);
}
return;
trunc:
ND_PRINT((ndo, "[|rerr]"));
}
static void
#ifdef INET6
aodv_v6_rreq(netdissect_options *ndo, const u_char *dat, u_int length)
#else
aodv_v6_rreq(netdissect_options *ndo, const u_char *dat _U_, u_int length)
#endif
{
#ifdef INET6
u_int i;
const struct aodv_rreq6 *ap = (const struct aodv_rreq6 *)dat;
ND_TCHECK(*ap);
if (length < sizeof(*ap))
goto trunc;
ND_PRINT((ndo, " v6 rreq %u %s%s%s%s%shops %u id 0x%08lx\n"
"\tdst %s seq %lu src %s seq %lu", length,
ap->rreq_type & RREQ_JOIN ? "[J]" : "",
ap->rreq_type & RREQ_REPAIR ? "[R]" : "",
ap->rreq_type & RREQ_GRAT ? "[G]" : "",
ap->rreq_type & RREQ_DEST ? "[D]" : "",
ap->rreq_type & RREQ_UNKNOWN ? "[U] " : " ",
ap->rreq_hops,
(unsigned long)EXTRACT_32BITS(&ap->rreq_id),
ip6addr_string(ndo, &ap->rreq_da),
(unsigned long)EXTRACT_32BITS(&ap->rreq_ds),
ip6addr_string(ndo, &ap->rreq_oa),
(unsigned long)EXTRACT_32BITS(&ap->rreq_os)));
i = length - sizeof(*ap);
if (i >= sizeof(struct aodv_ext))
aodv_extension(ndo, (const struct aodv_ext *)(dat + sizeof(*ap)), i);
return;
trunc:
ND_PRINT((ndo, " [|rreq"));
#else
ND_PRINT((ndo, " v6 rreq %u", length));
#endif
}
static void
#ifdef INET6
aodv_v6_rrep(netdissect_options *ndo, const u_char *dat, u_int length)
#else
aodv_v6_rrep(netdissect_options *ndo, const u_char *dat _U_, u_int length)
#endif
{
#ifdef INET6
u_int i;
const struct aodv_rrep6 *ap = (const struct aodv_rrep6 *)dat;
ND_TCHECK(*ap);
if (length < sizeof(*ap))
goto trunc;
ND_PRINT((ndo, " rrep %u %s%sprefix %u hops %u\n"
"\tdst %s dseq %lu src %s %lu ms", length,
ap->rrep_type & RREP_REPAIR ? "[R]" : "",
ap->rrep_type & RREP_ACK ? "[A] " : " ",
ap->rrep_ps & RREP_PREFIX_MASK,
ap->rrep_hops,
ip6addr_string(ndo, &ap->rrep_da),
(unsigned long)EXTRACT_32BITS(&ap->rrep_ds),
ip6addr_string(ndo, &ap->rrep_oa),
(unsigned long)EXTRACT_32BITS(&ap->rrep_life)));
i = length - sizeof(*ap);
if (i >= sizeof(struct aodv_ext))
aodv_extension(ndo, (const struct aodv_ext *)(dat + sizeof(*ap)), i);
return;
trunc:
ND_PRINT((ndo, " [|rreq"));
#else
ND_PRINT((ndo, " rrep %u", length));
#endif
}
static void
#ifdef INET6
aodv_v6_rerr(netdissect_options *ndo, const u_char *dat, u_int length)
#else
aodv_v6_rerr(netdissect_options *ndo, const u_char *dat _U_, u_int length)
#endif
{
#ifdef INET6
u_int i, dc;
const struct aodv_rerr *ap = (const struct aodv_rerr *)dat;
const struct rerr_unreach6 *dp6;
ND_TCHECK(*ap);
if (length < sizeof(*ap))
goto trunc;
ND_PRINT((ndo, " rerr %s [items %u] [%u]:",
ap->rerr_flags & RERR_NODELETE ? "[D]" : "",
ap->rerr_dc, length));
dp6 = (struct rerr_unreach6 *)(void *)(ap + 1);
i = length - sizeof(*ap);
for (dc = ap->rerr_dc; dc != 0; dc--) {
ND_TCHECK(*dp6);
if (i < sizeof(*dp6))
goto trunc;
ND_PRINT((ndo, " {%s}(%ld)", ip6addr_string(ndo, &dp6->u_da),
(unsigned long)EXTRACT_32BITS(&dp6->u_ds)));
dp6++;
i -= sizeof(*dp6);
}
return;
trunc:
ND_PRINT((ndo, "[|rerr]"));
#else
ND_PRINT((ndo, " rerr %u", length));
#endif
}
static void
#ifdef INET6
aodv_v6_draft_01_rreq(netdissect_options *ndo, const u_char *dat, u_int length)
#else
aodv_v6_draft_01_rreq(netdissect_options *ndo, const u_char *dat _U_, u_int length)
#endif
{
#ifdef INET6
u_int i;
const struct aodv_rreq6_draft_01 *ap = (const struct aodv_rreq6_draft_01 *)dat;
ND_TCHECK(*ap);
if (length < sizeof(*ap))
goto trunc;
ND_PRINT((ndo, " rreq %u %s%s%s%s%shops %u id 0x%08lx\n"
"\tdst %s seq %lu src %s seq %lu", length,
ap->rreq_type & RREQ_JOIN ? "[J]" : "",
ap->rreq_type & RREQ_REPAIR ? "[R]" : "",
ap->rreq_type & RREQ_GRAT ? "[G]" : "",
ap->rreq_type & RREQ_DEST ? "[D]" : "",
ap->rreq_type & RREQ_UNKNOWN ? "[U] " : " ",
ap->rreq_hops,
(unsigned long)EXTRACT_32BITS(&ap->rreq_id),
ip6addr_string(ndo, &ap->rreq_da),
(unsigned long)EXTRACT_32BITS(&ap->rreq_ds),
ip6addr_string(ndo, &ap->rreq_oa),
(unsigned long)EXTRACT_32BITS(&ap->rreq_os)));
i = length - sizeof(*ap);
if (i >= sizeof(struct aodv_ext))
aodv_extension(ndo, (const struct aodv_ext *)(dat + sizeof(*ap)), i);
return;
trunc:
ND_PRINT((ndo, " [|rreq"));
#else
ND_PRINT((ndo, " rreq %u", length));
#endif
}
static void
#ifdef INET6
aodv_v6_draft_01_rrep(netdissect_options *ndo, const u_char *dat, u_int length)
#else
aodv_v6_draft_01_rrep(netdissect_options *ndo, const u_char *dat _U_, u_int length)
#endif
{
#ifdef INET6
u_int i;
const struct aodv_rrep6_draft_01 *ap = (const struct aodv_rrep6_draft_01 *)dat;
ND_TCHECK(*ap);
if (length < sizeof(*ap))
goto trunc;
ND_PRINT((ndo, " rrep %u %s%sprefix %u hops %u\n"
"\tdst %s dseq %lu src %s %lu ms", length,
ap->rrep_type & RREP_REPAIR ? "[R]" : "",
ap->rrep_type & RREP_ACK ? "[A] " : " ",
ap->rrep_ps & RREP_PREFIX_MASK,
ap->rrep_hops,
ip6addr_string(ndo, &ap->rrep_da),
(unsigned long)EXTRACT_32BITS(&ap->rrep_ds),
ip6addr_string(ndo, &ap->rrep_oa),
(unsigned long)EXTRACT_32BITS(&ap->rrep_life)));
i = length - sizeof(*ap);
if (i >= sizeof(struct aodv_ext))
aodv_extension(ndo, (const struct aodv_ext *)(dat + sizeof(*ap)), i);
return;
trunc:
ND_PRINT((ndo, " [|rreq"));
#else
ND_PRINT((ndo, " rrep %u", length));
#endif
}
static void
#ifdef INET6
aodv_v6_draft_01_rerr(netdissect_options *ndo, const u_char *dat, u_int length)
#else
aodv_v6_draft_01_rerr(netdissect_options *ndo, const u_char *dat _U_, u_int length)
#endif
{
#ifdef INET6
u_int i, dc;
const struct aodv_rerr *ap = (const struct aodv_rerr *)dat;
const struct rerr_unreach6_draft_01 *dp6;
ND_TCHECK(*ap);
if (length < sizeof(*ap))
goto trunc;
ND_PRINT((ndo, " rerr %s [items %u] [%u]:",
ap->rerr_flags & RERR_NODELETE ? "[D]" : "",
ap->rerr_dc, length));
dp6 = (struct rerr_unreach6_draft_01 *)(void *)(ap + 1);
i = length - sizeof(*ap);
for (dc = ap->rerr_dc; dc != 0; dc--) {
ND_TCHECK(*dp6);
if (i < sizeof(*dp6))
goto trunc;
ND_PRINT((ndo, " {%s}(%ld)", ip6addr_string(ndo, &dp6->u_da),
(unsigned long)EXTRACT_32BITS(&dp6->u_ds)));
dp6++;
i -= sizeof(*dp6);
}
return;
trunc:
ND_PRINT((ndo, "[|rerr]"));
#else
ND_PRINT((ndo, " rerr %u", length));
#endif
}
void
aodv_print(netdissect_options *ndo,
const u_char *dat, u_int length, int is_ip6)
{
uint8_t msg_type;
/*
* The message type is the first byte; make sure we have it
* and then fetch it.
*/
ND_TCHECK(*dat);
msg_type = *dat;
ND_PRINT((ndo, " aodv"));
switch (msg_type) {
case AODV_RREQ:
if (is_ip6)
aodv_v6_rreq(ndo, dat, length);
else
aodv_rreq(ndo, dat, length);
break;
case AODV_RREP:
if (is_ip6)
aodv_v6_rrep(ndo, dat, length);
else
aodv_rrep(ndo, dat, length);
break;
case AODV_RERR:
if (is_ip6)
aodv_v6_rerr(ndo, dat, length);
else
aodv_rerr(ndo, dat, length);
break;
case AODV_RREP_ACK:
ND_PRINT((ndo, " rrep-ack %u", length));
break;
case AODV_V6_DRAFT_01_RREQ:
aodv_v6_draft_01_rreq(ndo, dat, length);
break;
case AODV_V6_DRAFT_01_RREP:
aodv_v6_draft_01_rrep(ndo, dat, length);
break;
case AODV_V6_DRAFT_01_RERR:
aodv_v6_draft_01_rerr(ndo, dat, length);
break;
case AODV_V6_DRAFT_01_RREP_ACK:
ND_PRINT((ndo, " rrep-ack %u", length));
break;
default:
ND_PRINT((ndo, " type %u %u", msg_type, length));
}
return;
trunc:
ND_PRINT((ndo, " [|aodv]"));
}
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