DL_RELEASE_IND
l2up_create(l2, DL_RELEASE_IND, 0, NULL);
l2up_create(l2, DL_RELEASE_IND, 0, NULL);
l2up_create(l2, DL_RELEASE_IND, 0, NULL);
l2up(l2, DL_RELEASE_IND, skb);
l2up(l2, DL_RELEASE_IND, skb);
pr = DL_RELEASE_IND;
lapb_dl_release_l2l3(l2, DL_RELEASE_IND);