Function mld_handle_state_change

freebsd/netinet6/mld6.c:2125–2179

* Issue an intermediate state change during the life-cycle. */

 * Issue an intermediate state change during the life-cycle.
 */
static int
mld_handle_state_change(struct in6_multi *inm, struct mld_ifsoftc *mli)
{
	struct ifnet		*ifp;
	int			 retval;
#ifdef KTR
	char			 ip6tbuf[INET6_ADDRSTRLEN];
#endif

	CTR4(KTR_MLD, "%s: state change for %s on ifp %p(%s)",
	    __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
	    inm->in6m_ifp, if_name(inm->in6m_ifp));

	ifp = inm->in6m_ifp;

	IN6_MULTI_LIST_LOCK_ASSERT();
	MLD_LOCK_ASSERT();

	KASSERT(mli && mli->mli_ifp == ifp,
	    ("%s: inconsistent ifp", __func__));

	if ((ifp->if_flags & IFF_LOOPBACK) ||
	    (mli->mli_flags & MLIF_SILENT) ||
	    !mld_is_addr_reported(&inm->in6m_addr) ||
	    (mli->mli_version != MLD_VERSION_2)) {
		if (!mld_is_addr_reported(&inm->in6m_addr)) {
			CTR1(KTR_MLD,
"%s: not kicking state machine for silent group", __func__);
		}
		CTR1(KTR_MLD, "%s: nothing to do", __func__);
		in6m_commit(inm);
		CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
		    ip6_sprintf(ip6tbuf, &inm->in6m_addr),
		    if_name(inm->in6m_ifp));
		return (0);
	}

	mbufq_drain(&inm->in6m_scq);

	retval = mld_v2_enqueue_group_record(&inm->in6m_scq, inm, 1, 0, 0,
	    (mli->mli_flags & MLIF_USEALLOW));
	CTR2(KTR_MLD, "%s: enqueue record = %d", __func__, retval);
	if (retval <= 0)
		return (-retval);

	/*
	 * If record(s) were enqueued, start the state-change
	 * report timer for this group.
	 */
	inm->in6m_scrv = mli->mli_rv;
	inm->in6m_sctimer = 1;
	V_state_change_timers_running6 = 1;

	return (0);
}

/*
 * Perform the final leave for a multicast address.