Function in6_update_ifa_internal

freebsd/netinet6/in6.c:1124–1183

* Update/configure interface address parameters: * * 1) Update lifetime * 2) Update interface metric ad flags * 3) Notify other subsystems */

 * 3) Notify other subsystems
 */
static int
in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
    struct in6_ifaddr *ia, int hostIsNew, int flags)
{
	int error;

	/* update timestamp */
	ia->ia6_updatetime = time_uptime;

	/*
	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
	 * to see if the address is deprecated or invalidated, but initialize
	 * these members for applications.
	 */
	ia->ia6_lifetime = ifra->ifra_lifetime;
	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
		ia->ia6_lifetime.ia6t_expire =
		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
	} else
		ia->ia6_lifetime.ia6t_expire = 0;
	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
		ia->ia6_lifetime.ia6t_preferred =
		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
	} else
		ia->ia6_lifetime.ia6t_preferred = 0;

	/*
	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
	 * userland, make it deprecated.
	 */
	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
		ia->ia6_lifetime.ia6t_pltime = 0;
		ia->ia6_lifetime.ia6t_preferred = time_uptime;
	}

	/*
	 * configure address flags.
	 */
	ia->ia6_flags = ifra->ifra_flags;

	/*
	 * Make the address tentative before joining multicast addresses,
	 * so that corresponding MLD responses would not have a tentative
	 * source address.
	 */
	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */

	/*
	 * DAD should be performed for an new address or addresses on
	 * an interface with ND6_IFF_IFDISABLED.
	 */
	if (in6if_do_dad(ifp) &&
	    (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
		ia->ia6_flags |= IN6_IFF_TENTATIVE;

	/* notify other subsystems */
	error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);