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/*
* Copyright (c) 1989, 1990, 1991, 1993, 1994
* 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.
*/
/* \summary: IPv6 Routing Information Protocol (RIPng) printer */
/* specification: RFC 2080 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
/*
* Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project.
* 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. Neither the name of the project 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 BY THE PROJECT 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 THE PROJECT 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 RIP6_VERSION 1
#define RIP6_REQUEST 1
#define RIP6_RESPONSE 2
struct netinfo6 {
nd_ipv6 rip6_dest;
nd_uint16_t rip6_tag;
nd_uint8_t rip6_plen;
nd_uint8_t rip6_metric;
};
struct rip6 {
nd_uint8_t rip6_cmd;
nd_uint8_t rip6_vers;
nd_byte rip6_res1[2];
struct netinfo6 rip6_nets[1];
};
#define HOPCNT_INFINITY6 16
static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr)
{
static const nd_ipv6 in6addr_any_val = { 0 }; /* :: */
return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0);
}
static void
rip6_entry_print(netdissect_options *ndo,
const struct netinfo6 *ni, const u_int print_metric)
{
uint16_t tag;
uint8_t metric;
ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest),
GET_U_1(ni->rip6_plen));
tag = GET_BE_U_2(ni->rip6_tag);
if (tag)
ND_PRINT(" [%u]", tag);
metric = GET_U_1(ni->rip6_metric);
if (metric && print_metric)
ND_PRINT(" (%u)", metric);
}
void
ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
{
const struct rip6 *rp = (const struct rip6 *)dat;
uint8_t cmd, vers;
const struct netinfo6 *ni;
unsigned int length_left;
u_int j;
ndo->ndo_protocol = "ripng";
vers = GET_U_1(rp->rip6_vers);
if (vers != RIP6_VERSION) {
nd_print_protocol(ndo);
ND_PRINT(" [version %u, must be %u]", vers, RIP6_VERSION);
goto invalid;
}
cmd = GET_U_1(rp->rip6_cmd);
switch (cmd) {
case RIP6_REQUEST:
length_left = length;
if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
goto invalid;
length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
j = length_left / sizeof(*ni);
if (j == 1) {
if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6
&& ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
ND_PRINT(" ripng-req dump");
break;
}
}
if (j * sizeof(*ni) != length_left)
ND_PRINT(" ripng-req %u[%u]:", j, length);
else
ND_PRINT(" ripng-req %u:", j);
for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
length_left -= sizeof(*ni), ++ni) {
if (ndo->ndo_vflag > 1)
ND_PRINT("\n\t");
else
ND_PRINT(" ");
rip6_entry_print(ndo, ni, FALSE);
}
if (length_left != 0)
goto invalid;
break;
case RIP6_RESPONSE:
length_left = length;
if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
goto invalid;
length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
j = length_left / sizeof(*ni);
if (j * sizeof(*ni) != length_left)
ND_PRINT(" ripng-resp %u[%u]:", j, length);
else
ND_PRINT(" ripng-resp %u:", j);
for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
length_left -= sizeof(*ni), ++ni) {
if (ndo->ndo_vflag > 1)
ND_PRINT("\n\t");
else
ND_PRINT(" ");
rip6_entry_print(ndo, ni, TRUE);
}
if (length_left != 0)
goto invalid;
break;
default:
ND_PRINT(" ripng-%u ?? %u", cmd, length);
goto invalid;
}
return;
invalid:
nd_print_invalid(ndo);
}
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