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tcpdump/print-aodv.c
Francois-Xavier Le Bail ef5323efe6 Update the ND_LCHECK*() macros to ND_ICHECK*() macros 
ICHECK like Invalid-Check.
Reminder: If the checked expression is true an error message is printed
and a 'goto invalid' is executed.

This change adds the parameter 'operator'.

Before this change, '<' comparison was hard coded.
We can do now:
ND_ICHECK_U(length, <, HEADER_LEN);
ND_ICHECK_U(length, ==, 24);
ND_ICHECK_U(length, !=, 8);
ND_ICHECK_ZU(length, <, sizeof(struct my_struct));
ND_ICHECKMSG_U("message length", msg_tlen, <, 4);
...
(Any comparison operator)

Remark: The change of names from ND_LCHECK*() to ND_ICHECK*() is
because something else than a length(L) can be checked.

Moreover:
Place the 'message' parameter at the beginning of ND_ICHECKMSG_U()
and ND_ICHECKMSG_ZU() paramaters lists.
2021-12-29 15:11:32 +01:00

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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.
*/
/* \summary: Ad hoc On-Demand Distance Vector (AODV) Routing printer */
/* specification: RFC 3561 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
struct aodv_rreq {
nd_uint8_t rreq_type; /* AODV message type (1) */
nd_uint8_t rreq_flags; /* various flags */
nd_uint8_t rreq_zero0; /* reserved, set to zero */
nd_uint8_t rreq_hops; /* number of hops from originator */
nd_uint32_t rreq_id; /* request ID */
nd_ipv4 rreq_da; /* destination IPv4 address */
nd_uint32_t rreq_ds; /* destination sequence number */
nd_ipv4 rreq_oa; /* originator IPv4 address */
nd_uint32_t rreq_os; /* originator sequence number */
};
struct aodv_rreq6 {
nd_uint8_t rreq_type; /* AODV message type (1) */
nd_uint8_t rreq_flags; /* various flags */
nd_uint8_t rreq_zero0; /* reserved, set to zero */
nd_uint8_t rreq_hops; /* number of hops from originator */
nd_uint32_t rreq_id; /* request ID */
nd_ipv6 rreq_da; /* destination IPv6 address */
nd_uint32_t rreq_ds; /* destination sequence number */
nd_ipv6 rreq_oa; /* originator IPv6 address */
nd_uint32_t rreq_os; /* originator sequence number */
};
#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 {
nd_uint8_t rrep_type; /* AODV message type (2) */
nd_uint8_t rrep_flags; /* various flags */
nd_uint8_t rrep_ps; /* prefix size */
nd_uint8_t rrep_hops; /* number of hops from o to d */
nd_ipv4 rrep_da; /* destination IPv4 address */
nd_uint32_t rrep_ds; /* destination sequence number */
nd_ipv4 rrep_oa; /* originator IPv4 address */
nd_uint32_t rrep_life; /* lifetime of this route */
};
struct aodv_rrep6 {
nd_uint8_t rrep_type; /* AODV message type (2) */
nd_uint8_t rrep_flags; /* various flags */
nd_uint8_t rrep_ps; /* prefix size */
nd_uint8_t rrep_hops; /* number of hops from o to d */
nd_ipv6 rrep_da; /* destination IPv6 address */
nd_uint32_t rrep_ds; /* destination sequence number */
nd_ipv6 rrep_oa; /* originator IPv6 address */
nd_uint32_t rrep_life; /* lifetime of this route */
};
#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 {
nd_ipv4 u_da; /* IPv4 address */
nd_uint32_t u_ds; /* sequence number */
};
struct rerr_unreach6 {
nd_ipv6 u_da; /* IPv6 address */
nd_uint32_t u_ds; /* sequence number */
};
struct aodv_rerr {
nd_uint8_t rerr_type; /* AODV message type (3 or 18) */
nd_uint8_t rerr_flags; /* various flags */
nd_uint8_t rerr_zero0; /* reserved, set to zero */
nd_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 {
nd_uint8_t ra_type;
nd_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 */
static const struct tok msg_type_str[] = {
{ AODV_RREQ, "rreq" },
{ AODV_RREP, "rrep" },
{ AODV_RERR, "rerr" },
{ AODV_RREP_ACK, "rrep-ack" },
{ 0, NULL }
};
struct aodv_ext {
nd_uint8_t type; /* extension type */
nd_uint8_t length; /* extension length */
};
struct aodv_hello {
struct aodv_ext eh; /* extension header */
nd_uint32_t interval; /* 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;
uint8_t ext_type, ext_length;
ext_type = GET_U_1(ep->type);
ext_length = GET_U_1(ep->length);
switch (ext_type) {
case AODV_EXT_HELLO:
ah = (const struct aodv_hello *)(const void *)ep;
ND_ICHECKMSG_ZU("ext data length", length, <,
sizeof(struct aodv_hello));
if (ext_length < 4) {
ND_PRINT("\n\text HELLO - bad length %u", ext_length);
goto invalid;
}
ND_PRINT("\n\text HELLO %u ms",
GET_BE_U_4(ah->interval));
break;
default:
ND_PRINT("\n\text %u %u", ext_type, ext_length);
break;
}
return;
invalid:
nd_print_invalid(ndo);
}
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_ICHECKMSG_ZU("message length", length, <, sizeof(*ap));
ND_PRINT(" %u %s%s%s%s%shops %u id 0x%08x\n"
"\tdst %s seq %u src %s seq %u", length,
GET_U_1(ap->rreq_type) & RREQ_JOIN ? "[J]" : "",
GET_U_1(ap->rreq_type) & RREQ_REPAIR ? "[R]" : "",
GET_U_1(ap->rreq_type) & RREQ_GRAT ? "[G]" : "",
GET_U_1(ap->rreq_type) & RREQ_DEST ? "[D]" : "",
GET_U_1(ap->rreq_type) & RREQ_UNKNOWN ? "[U] " : " ",
GET_U_1(ap->rreq_hops),
GET_BE_U_4(ap->rreq_id),
GET_IPADDR_STRING(ap->rreq_da),
GET_BE_U_4(ap->rreq_ds),
GET_IPADDR_STRING(ap->rreq_oa),
GET_BE_U_4(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;
invalid:
nd_print_invalid(ndo);
}
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_ICHECKMSG_ZU("message length", length, <, sizeof(*ap));
ND_PRINT(" %u %s%sprefix %u hops %u\n"
"\tdst %s dseq %u src %s %u ms", length,
GET_U_1(ap->rrep_type) & RREP_REPAIR ? "[R]" : "",
GET_U_1(ap->rrep_type) & RREP_ACK ? "[A] " : " ",
GET_U_1(ap->rrep_ps) & RREP_PREFIX_MASK,
GET_U_1(ap->rrep_hops),
GET_IPADDR_STRING(ap->rrep_da),
GET_BE_U_4(ap->rrep_ds),
GET_IPADDR_STRING(ap->rrep_oa),
GET_BE_U_4(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;
invalid:
nd_print_invalid(ndo);
}
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_ICHECKMSG_ZU("message length", length, <, sizeof(*ap));
ND_PRINT(" %s [items %u] [%u]:",
GET_U_1(ap->rerr_flags) & RERR_NODELETE ? "[D]" : "",
GET_U_1(ap->rerr_dc), length);
dp = (const struct rerr_unreach *)(dat + sizeof(*ap));
i = length - sizeof(*ap);
for (dc = GET_U_1(ap->rerr_dc); dc != 0; dc--) {
ND_ICHECKMSG_ZU("remaining length", i, <, sizeof(*dp));
ND_PRINT(" {%s}(%u)", GET_IPADDR_STRING(dp->u_da),
GET_BE_U_4(dp->u_ds));
dp++;
i -= sizeof(*dp);
}
return;
invalid:
nd_print_invalid(ndo);
}
static void
aodv_v6_rreq(netdissect_options *ndo, const u_char *dat, u_int length)
{
u_int i;
const struct aodv_rreq6 *ap = (const struct aodv_rreq6 *)dat;
ND_ICHECKMSG_ZU("message length", length, <, sizeof(*ap));
ND_PRINT(" %u %s%s%s%s%shops %u id 0x%08x\n"
"\tdst %s seq %u src %s seq %u", length,
GET_U_1(ap->rreq_type) & RREQ_JOIN ? "[J]" : "",
GET_U_1(ap->rreq_type) & RREQ_REPAIR ? "[R]" : "",
GET_U_1(ap->rreq_type) & RREQ_GRAT ? "[G]" : "",
GET_U_1(ap->rreq_type) & RREQ_DEST ? "[D]" : "",
GET_U_1(ap->rreq_type) & RREQ_UNKNOWN ? "[U] " : " ",
GET_U_1(ap->rreq_hops),
GET_BE_U_4(ap->rreq_id),
GET_IP6ADDR_STRING(ap->rreq_da),
GET_BE_U_4(ap->rreq_ds),
GET_IP6ADDR_STRING(ap->rreq_oa),
GET_BE_U_4(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;
invalid:
nd_print_invalid(ndo);
}
static void
aodv_v6_rrep(netdissect_options *ndo, const u_char *dat, u_int length)
{
u_int i;
const struct aodv_rrep6 *ap = (const struct aodv_rrep6 *)dat;
ND_ICHECKMSG_ZU("message length", length, <, sizeof(*ap));
ND_PRINT(" %u %s%sprefix %u hops %u\n"
"\tdst %s dseq %u src %s %u ms", length,
GET_U_1(ap->rrep_type) & RREP_REPAIR ? "[R]" : "",
GET_U_1(ap->rrep_type) & RREP_ACK ? "[A] " : " ",
GET_U_1(ap->rrep_ps) & RREP_PREFIX_MASK,
GET_U_1(ap->rrep_hops),
GET_IP6ADDR_STRING(ap->rrep_da),
GET_BE_U_4(ap->rrep_ds),
GET_IP6ADDR_STRING(ap->rrep_oa),
GET_BE_U_4(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;
invalid:
nd_print_invalid(ndo);
}
static void
aodv_v6_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_unreach6 *dp6;
ND_ICHECKMSG_ZU("message length", length, <, sizeof(*ap));
ND_PRINT(" %s [items %u] [%u]:",
GET_U_1(ap->rerr_flags) & RERR_NODELETE ? "[D]" : "",
GET_U_1(ap->rerr_dc), length);
dp6 = (const struct rerr_unreach6 *)(const void *)(ap + 1);
i = length - sizeof(*ap);
for (dc = GET_U_1(ap->rerr_dc); dc != 0; dc--) {
ND_ICHECKMSG_ZU("remaining length", i, <, sizeof(*dp6));
ND_PRINT(" {%s}(%u)", GET_IP6ADDR_STRING(dp6->u_da),
GET_BE_U_4(dp6->u_ds));
dp6++;
i -= sizeof(*dp6);
}
return;
invalid:
nd_print_invalid(ndo);
}
void
aodv_print(netdissect_options *ndo,
const u_char *dat, u_int length, int is_ip6)
{
uint8_t msg_type;
ndo->ndo_protocol = "aodv";
ND_PRINT(" aodv");
/*
* The message type is the first byte; make sure we have it
* and then fetch it.
*/
msg_type = GET_U_1(dat);
ND_PRINT(" %s", tok2str(msg_type_str, "type %u", msg_type));
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(" %u", length);
break;
default:
ND_PRINT(" %u", length);
}
}
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