1 files changed, 57 insertions, 0 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 3ef3fe20283f..8ea1e36bf8eb 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2895,6 +2895,55 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 }
 
 static int
+inet6_addr_modify(int ifindex, struct in6_addr *pfx,
+                  __u32 prefered_lft, __u32 valid_lft)
+{
+        struct inet6_ifaddr *ifp = NULL;
+        struct net_device *dev;
+        int ifa_flags = 0;
+
+        if ((dev = __dev_get_by_index(ifindex)) == NULL)
+                return -ENODEV;
+
+        if (!(dev->flags&IFF_UP))
+                return -ENETDOWN;
+
+        if (!valid_lft || (prefered_lft > valid_lft))
+                return -EINVAL;
+
+        ifp = ipv6_get_ifaddr(pfx, dev, 1);
+        if (ifp == NULL)
+                return -ENOENT;
+
+        if (valid_lft == INFINITY_LIFE_TIME)
+                ifa_flags = IFA_F_PERMANENT;
+        else if (valid_lft >= 0x7FFFFFFF/HZ)
+                valid_lft = 0x7FFFFFFF/HZ;
+
+        if (prefered_lft == 0)
+                ifa_flags = IFA_F_DEPRECATED;
+        else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
+                 (prefered_lft != INFINITY_LIFE_TIME))
+                prefered_lft = 0x7FFFFFFF/HZ;
+
+        spin_lock_bh(&ifp->lock);
+        ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED|IFA_F_PERMANENT)) | ifa_flags;
+
+        ifp->tstamp = jiffies;
+        ifp->valid_lft = valid_lft;
+        ifp->prefered_lft = prefered_lft;
+
+        spin_unlock_bh(&ifp->lock);
+        if (!(ifp->flags&IFA_F_TENTATIVE))
+                ipv6_ifa_notify(0, ifp);
+        in6_ifa_put(ifp);
+
+        addrconf_verify(0);
+
+        return 0;
+}
+
+static int
 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 {
         struct rtattr  **rta = arg;
@@ -2926,6 +2975,14 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
                 prefered_lft = ci->ifa_prefered;
         }
 
+        if (nlh->nlmsg_flags & NLM_F_REPLACE) {
+                int ret;
+                ret = inet6_addr_modify(ifm->ifa_index, pfx,
+                                        prefered_lft, valid_lft);
+                if (ret == 0 || !(nlh->nlmsg_flags & NLM_F_CREATE))
+                        return ret;
+        }
+
         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
                               prefered_lft, valid_lft);