Function prelist_update

freebsd/netinet6/nd6_rtr.c:1474–1798

}

static int
prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
    struct mbuf *m, int mcast)
{
	struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
	struct ifaddr *ifa;
	struct ifnet *ifp = new->ndpr_ifp;
	struct nd_prefix *pr;
	int error = 0;
	int auth;
	struct in6_addrlifetime lt6_tmp;
	char ip6buf[INET6_ADDRSTRLEN];

	NET_EPOCH_ASSERT();

	auth = 0;
	if (m) {
		/*
		 * Authenticity for NA consists authentication for
		 * both IP header and IP datagrams, doesn't it ?
		 */
#if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
		auth = ((m->m_flags & M_AUTHIPHDR) &&
		    (m->m_flags & M_AUTHIPDGM));
#endif
	}

	if ((pr = nd6_prefix_lookup(new)) != NULL) {
		/*
		 * nd6_prefix_lookup() ensures that pr and new have the same
		 * prefix on a same interface.
		 */

		/*
		 * Update prefix information.  Note that the on-link (L) bit
		 * and the autonomous (A) bit should NOT be changed from 1
		 * to 0.
		 */
		if (new->ndpr_raf_onlink == 1)
			pr->ndpr_raf_onlink = 1;
		if (new->ndpr_raf_auto == 1)
			pr->ndpr_raf_auto = 1;
		if (new->ndpr_raf_onlink) {
			pr->ndpr_vltime = new->ndpr_vltime;
			pr->ndpr_pltime = new->ndpr_pltime;
			(void)in6_init_prefix_ltimes(pr); /* XXX error case? */
			pr->ndpr_lastupdate = time_uptime;
		}

		if (new->ndpr_raf_onlink &&
		    (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
			ND6_ONLINK_LOCK();
			if ((error = nd6_prefix_onlink(pr)) != 0) {
				nd6log((LOG_ERR,
				    "%s: failed to make the prefix %s/%d "
				    "on-link on %s (errno=%d)\n", __func__,
				    ip6_sprintf(ip6buf,
				        &pr->ndpr_prefix.sin6_addr),