Function sctp_add_to_tail_pointer

freebsd/netinet/sctp_indata.c:674–727

}

static void
sctp_add_to_tail_pointer(struct sctp_queued_to_read *control, struct mbuf *m, uint32_t *added)
{
	struct mbuf *prev = NULL;
	struct sctp_tcb *stcb;

	stcb = control->stcb;
	if (stcb == NULL) {
#ifdef INVARIANTS
		panic("Control broken");
#else
		return;
#endif
	}
	if (control->tail_mbuf == NULL) {
		/* TSNH */
		sctp_m_freem(control->data);
		control->data = m;
		sctp_setup_tail_pointer(control);
		return;
	}
	control->tail_mbuf->m_next = m;
	while (m) {
		if (SCTP_BUF_LEN(m) == 0) {
			/* Skip mbufs with NO length */
			if (prev == NULL) {
				/* First one */
				control->tail_mbuf->m_next = sctp_m_free(m);
				m = control->tail_mbuf->m_next;
			} else {
				SCTP_BUF_NEXT(prev) = sctp_m_free(m);
				m = SCTP_BUF_NEXT(prev);
			}
			if (m == NULL) {
				control->tail_mbuf = prev;
			}
			continue;
		}
		prev = m;
		if (control->on_read_q) {
			/*
			 * On read queue so we must increment the SB stuff,
			 * we assume caller has done any locks of SB.
			 */
			sctp_sballoc(stcb, &stcb->sctp_socket->so_rcv, m);
		}
		*added += SCTP_BUF_LEN(m);
		atomic_add_int(&control->length, SCTP_BUF_LEN(m));
		m = SCTP_BUF_NEXT(m);
	}
	if (prev) {
		control->tail_mbuf = prev;
	}
}

static void
sctp_build_readq_entry_from_ctl(struct sctp_queued_to_read *nc, struct sctp_queued_to_read *control)