Function mld_v2_process_group_timers

freebsd/netinet6/mld6.c:1514–1629

* Update a group's timers for MLDv2. * Will update the global pending timer flags. * Note: Unlocked read from mli. */

 * Note: Unlocked read from mli.
 */
static void
mld_v2_process_group_timers(struct in6_multi_head *inmh,
    struct mbufq *qrq, struct mbufq *scq,
    struct in6_multi *inm, const int uri_fasthz)
{
	int query_response_timer_expired;
	int state_change_retransmit_timer_expired;
#ifdef KTR
	char ip6tbuf[INET6_ADDRSTRLEN];
#endif

	IN6_MULTI_LIST_LOCK_ASSERT();
	MLD_LOCK_ASSERT();

	query_response_timer_expired = 0;
	state_change_retransmit_timer_expired = 0;

	/*
	 * During a transition from compatibility mode back to MLDv2,
	 * a group record in REPORTING state may still have its group
	 * timer active. This is a no-op in this function; it is easier
	 * to deal with it here than to complicate the slow-timeout path.
	 */
	if (inm->in6m_timer == 0) {
		query_response_timer_expired = 0;
	} else if (--inm->in6m_timer == 0) {
		query_response_timer_expired = 1;
	} else {
		V_current_state_timers_running6 = 1;
	}

	if (inm->in6m_sctimer == 0) {
		state_change_retransmit_timer_expired = 0;
	} else if (--inm->in6m_sctimer == 0) {
		state_change_retransmit_timer_expired = 1;
	} else {
		V_state_change_timers_running6 = 1;
	}

	/* We are in fasttimo, so be quick about it. */
	if (!state_change_retransmit_timer_expired &&
	    !query_response_timer_expired)
		return;

	switch (inm->in6m_state) {
	case MLD_NOT_MEMBER:
	case MLD_SILENT_MEMBER:
	case MLD_SLEEPING_MEMBER:
	case MLD_LAZY_MEMBER:
	case MLD_AWAKENING_MEMBER:
	case MLD_IDLE_MEMBER:
		break;
	case MLD_G_QUERY_PENDING_MEMBER:
	case MLD_SG_QUERY_PENDING_MEMBER:
		/*
		 * Respond to a previously pending Group-Specific
		 * or Group-and-Source-Specific query by enqueueing
		 * the appropriate Current-State report for