Function nd6_timer

freebsd/netinet6/nd6.c:919–1077

* ND6 timer routine to expire default route list and prefix list */

 * ND6 timer routine to expire default route list and prefix list
 */
void
nd6_timer(void *arg)
{
	CURVNET_SET((struct vnet *) arg);
	struct epoch_tracker et;
	struct nd_prhead prl;
	struct nd_prefix *pr, *npr;
	struct ifnet *ifp;
	struct in6_ifaddr *ia6, *nia6;
	uint64_t genid;

	LIST_INIT(&prl);

	NET_EPOCH_ENTER(et);
	nd6_defrouter_timer();

	/*
	 * expire interface addresses.
	 * in the past the loop was inside prefix expiry processing.
	 * However, from a stricter speci-confrmance standpoint, we should
	 * rather separate address lifetimes and prefix lifetimes.
	 *
	 * XXXRW: in6_ifaddrhead locking.
	 */
  addrloop:
	CK_STAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
		/* check address lifetime */
		if (IFA6_IS_INVALID(ia6)) {
			int regen = 0;

			/*
			 * If the expiring address is temporary, try
			 * regenerating a new one.  This would be useful when
			 * we suspended a laptop PC, then turned it on after a
			 * period that could invalidate all temporary
			 * addresses.  Although we may have to restart the
			 * loop (see below), it must be after purging the
			 * address.  Otherwise, we'd see an infinite loop of
			 * regeneration.
			 */
			if (V_ip6_use_tempaddr &&
			    (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
				if (regen_tmpaddr(ia6) == 0)
					regen = 1;
			}

			in6_purgeaddr(&ia6->ia_ifa);

			if (regen)
				goto addrloop; /* XXX: see below */
		} else if (IFA6_IS_DEPRECATED(ia6)) {
			int oldflags = ia6->ia6_flags;

			ia6->ia6_flags |= IN6_IFF_DEPRECATED;

			/*
			 * If a temporary address has just become deprecated,
			 * regenerate a new one if possible.