Function nd6_dad_timer

freebsd/netinet6/nd6_nbr.c:1336–1447

}

static void
nd6_dad_timer(struct dadq *dp)
{
	CURVNET_SET(dp->dad_vnet);
	struct ifaddr *ifa = dp->dad_ifa;
	struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
	struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
	char ip6buf[INET6_ADDRSTRLEN];
	struct epoch_tracker et;

	KASSERT(ia != NULL, ("DAD entry %p with no address", dp));

	NET_EPOCH_ENTER(et);
	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
		/* Do not need DAD for ifdisabled interface. */
		log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
		    "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
		goto err;
	}
	if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
		log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
			"%s(%s)\n",
			ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
			ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
		goto err;
	}
	if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
		log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
			"%s(%s)\n",
			ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
			ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
		goto err;
	}

	/* Stop DAD if the interface is down even after dad_maxtry attempts. */
	if ((dp->dad_ns_tcount > V_dad_maxtry) &&
	    (((ifp->if_flags & IFF_UP) == 0) ||
	     ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
		nd6log((LOG_INFO, "%s: could not run DAD "
		    "because the interface was down or not running.\n",
		    if_name(ifa->ifa_ifp)));
		goto err;
	}

	/* Need more checks? */
	if (dp->dad_ns_ocount < dp->dad_count) {
		/*
		 * We have more NS to go.  Send NS packet for DAD.
		 */
		nd6_dad_starttimer(dp,
		    (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
		goto done;
	} else {
		/*
		 * We have transmitted sufficient number of DAD packets.
		 * See what we've got.
		 */
		if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)