ipnetif_cbdata_t
ipnetif_cbdata_t *cbnode;
list_create(&cbdata, sizeof (ipnetif_cbdata_t),
offsetof(ipnetif_cbdata_t, ic_next));
cbnode = kmem_zalloc(sizeof (ipnetif_cbdata_t), KM_SLEEP);
kmem_free(cbnode, sizeof (ipnetif_cbdata_t));