1 files changed, 39 insertions, 12 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 92f952d093db..7596f071d308 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -324,7 +324,7 @@ static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
         return lladdr + prepad;
 }
 
-int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
+int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
 {
         switch (dev->type) {
         case ARPHRD_ETHER:
@@ -611,6 +611,29 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
                      inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
 }
 
+static void ndisc_send_unsol_na(struct net_device *dev)
+{
+        struct inet6_dev *idev;
+        struct inet6_ifaddr *ifa;
+        struct in6_addr mcaddr;
+
+        idev = in6_dev_get(dev);
+        if (!idev)
+                return;
+
+        read_lock_bh(&idev->lock);
+        list_for_each_entry(ifa, &idev->addr_list, if_list) {
+                addrconf_addr_solict_mult(&ifa->addr, &mcaddr);
+                ndisc_send_na(dev, NULL, &mcaddr, &ifa->addr,
+                              /*router=*/ !!idev->cnf.forwarding,
+                              /*solicited=*/ false, /*override=*/ true,
+                              /*inc_opt=*/ true);
+        }
+        read_unlock_bh(&idev->lock);
+
+        in6_dev_put(idev);
+}
+
 void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
                    const struct in6_addr *solicit,
                    const struct in6_addr *daddr, const struct in6_addr *saddr)
@@ -725,8 +748,8 @@ static int pndisc_is_router(const void *pkey,
 static void ndisc_recv_ns(struct sk_buff *skb)
 {
         struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
-        struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
-        struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
+        const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
+        const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
         u8 *lladdr = NULL;
         u32 ndoptlen = skb->tail - (skb->transport_header +
                                     offsetof(struct nd_msg, opt));
@@ -901,8 +924,8 @@ out:
 static void ndisc_recv_na(struct sk_buff *skb)
 {
         struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
-        struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
-        struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
+        const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
+        const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
         u8 *lladdr = NULL;
         u32 ndoptlen = skb->tail - (skb->transport_header +
                                     offsetof(struct nd_msg, opt));
@@ -945,9 +968,10 @@ static void ndisc_recv_na(struct sk_buff *skb)
         }
         ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
         if (ifp) {
-                if (ifp->flags & IFA_F_TENTATIVE) {
-                        addrconf_dad_failure(ifp);
-                        return;
+                if (skb->pkt_type != PACKET_LOOPBACK
+                    && (ifp->flags & IFA_F_TENTATIVE)) {
+                                addrconf_dad_failure(ifp);
+                                return;
                 }
                 /* What should we make now? The advertisement
                    is invalid, but ndisc specs say nothing
@@ -1014,7 +1038,7 @@ static void ndisc_recv_rs(struct sk_buff *skb)
         unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
         struct neighbour *neigh;
         struct inet6_dev *idev;
-        struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
+        const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
         struct ndisc_options ndopts;
         u8 *lladdr = NULL;
 
@@ -1411,8 +1435,8 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
 {
         struct inet6_dev *in6_dev;
         struct icmp6hdr *icmph;
-        struct in6_addr *dest;
-        struct in6_addr *target;        /* new first hop to destination */
+        const struct in6_addr *dest;
+        const struct in6_addr *target;  /* new first hop to destination */
         struct neighbour *neigh;
         int on_link = 0;
         struct ndisc_options ndopts;
@@ -1445,7 +1469,7 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
         }
 
         icmph = icmp6_hdr(skb);
-        target = (struct in6_addr *) (icmph + 1);
+        target = (const struct in6_addr *) (icmph + 1);
         dest = target + 1;
 
         if (ipv6_addr_is_multicast(dest)) {
@@ -1722,6 +1746,9 @@ static int ndisc_netdev_event(struct notifier_block *this, unsigned long event,
                 neigh_ifdown(&nd_tbl, dev);
                 fib6_run_gc(~0UL, net);
                 break;
+        case NETDEV_NOTIFY_PEERS:
+                ndisc_send_unsol_na(dev);
+                break;
         default:
                 break;
         }