#endif
}
+static bool ipv6_allow_optimistic_dad(struct net *net,
+ struct inet6_dev *idev)
+{
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ if (!idev)
+ return false;
+ if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
+ return false;
+
+ return true;
+#else
+ return false;
+#endif
+}
+
static int ipv6_get_saddr_eval(struct net *net,
struct ipv6_saddr_score *score,
struct ipv6_saddr_dst *dst,
spin_lock_bh(&ifp->lock);
addrconf_del_dad_work(ifp);
ifp->flags |= IFA_F_TENTATIVE;
+ if (dad_failed)
+ ifp->flags &= ~IFA_F_OPTIMISTIC;
spin_unlock_bh(&ifp->lock);
if (dad_failed)
ipv6_ifa_notify(0, ifp);
(ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
return -EINVAL;
+ if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
+ ifa_flags &= ~IFA_F_OPTIMISTIC;
+
timeout = addrconf_timeout_fixup(valid_lft, HZ);
if (addrconf_finite_timeout(timeout)) {
expires = jiffies_to_clock_t(timeout * HZ);
struct in6_addr *pfx, *peer_pfx;
struct inet6_ifaddr *ifa;
struct net_device *dev;
+ struct inet6_dev *idev;
u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
u32 ifa_flags;
int err;
/* We ignore other flags so far. */
ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
- IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
+ IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
+
+ idev = ipv6_find_idev(dev);
+ if (IS_ERR(idev))
+ return PTR_ERR(idev);
+
+ if (!ipv6_allow_optimistic_dad(net, idev))
+ ifa_flags &= ~IFA_F_OPTIMISTIC;
+
+ if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) {
+ NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
+ return -EINVAL;
+ }
ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
if (!ifa) {