/* 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;
}
/* 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;
}