SADB_EXT_MAX
for (i = 0; i <= SADB_EXT_MAX; i++)
bzero(extv, sizeof (sadb_ext_t *) * (SADB_EXT_MAX + 1));
extv[0]->sadb_ext_type > SADB_EXT_MAX)
sadb_ext_t *extv[SADB_EXT_MAX + 1];
sadb_ext_t *downextv[SADB_EXT_MAX + 1];
sadb_ext_t *extv[SADB_EXT_MAX + 1];
struct sadb_ext *ks_in_extv[SADB_EXT_MAX + 1];