Пример #1
0
/* 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;
	u_char lls_hello = op->ospf6_type == OSPF_TYPE_HELLO &&
	                   op->ospf6_hello.hello_options & OSPF6_OPTION_L;
	u_char lls_dd    = op->ospf6_type == OSPF_TYPE_DD &&
	                   op->ospf6_db.db_options & OSPF6_OPTION_L;

	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;
}
Пример #2
0
/* 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);
		if (EXTRACT_32BITS(&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);
		if (EXTRACT_32BITS(&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;
}