Function sctp_send_asconf

freebsd/netinet/sctp_output.c:9242–9290

}

void
sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
{
	/*
	 * formulate and queue an ASCONF to the peer. ASCONF parameters
	 * should be queued on the assoc queue.
	 */
	struct sctp_tmit_chunk *chk;
	struct mbuf *m_asconf;
	int len;

	SCTP_TCB_LOCK_ASSERT(stcb);

	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
		/* can't send a new one if there is one in flight already */
		return;
	}

	/* compose an ASCONF chunk, maximum length is PMTU */
	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
	if (m_asconf == NULL) {
		return;
	}

	sctp_alloc_a_chunk(stcb, chk);
	if (chk == NULL) {
		/* no memory */
		sctp_m_freem(m_asconf);
		return;
	}

	chk->copy_by_ref = 0;
	chk->rec.chunk_id.id = SCTP_ASCONF;
	chk->rec.chunk_id.can_take_data = 0;
	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
	chk->data = m_asconf;
	chk->send_size = len;
	chk->sent = SCTP_DATAGRAM_UNSENT;
	chk->snd_count = 0;
	chk->asoc = &stcb->asoc;
	chk->whoTo = net;
	if (chk->whoTo) {
		atomic_add_int(&chk->whoTo->ref_count, 1);
	}
	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
	chk->asoc->ctrl_queue_cnt++;
	return;
}

void
sctp_send_asconf_ack(struct sctp_tcb *stcb)