Merge remote-tracking branch 'lsk/v3.10/topic/aosp' into linux-linaro-lsk-android

[firefly-linux-kernel-4.4.55.git] / net / ipv6 / addrconf.c

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e1381119a6d8412b955498dff3ddb593e8342d5a..08b13803d617d0e241f0395a58e6e16fa7c79cec 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1113,8 +1113,11 @@ retry:
         * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
         * an implementation must not create a temporary address with a zero
         * Preferred Lifetime.
+        * Use age calculation as in addrconf_verify to avoid unnecessary
+        * temporary addresses being generated.
         */
-       if (tmp_prefered_lft <= regen_advance) {
+       age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+       if (tmp_prefered_lft <= regen_advance + age) {
                in6_ifa_put(ifp);
                in6_dev_put(idev);
                ret = -1;
@@ -1126,12 +1129,10 @@ retry:
        if (ifp->flags & IFA_F_OPTIMISTIC)
                addr_flags |= IFA_F_OPTIMISTIC;
 
-       ift = !max_addresses ||
-             ipv6_count_addresses(idev) < max_addresses ?
-               ipv6_add_addr(idev, &addr, tmp_plen,
-                             ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
-                             addr_flags) : NULL;
-       if (IS_ERR_OR_NULL(ift)) {
+       ift = ipv6_add_addr(idev, &addr, tmp_plen,
+                           ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
+                           addr_flags);
+       if (IS_ERR(ift)) {
                in6_ifa_put(ifp);
                in6_dev_put(idev);
                pr_info("%s: retry temporary address regeneration\n", __func__);
@@ -1476,6 +1477,23 @@ try_nextdev:
 }
 EXPORT_SYMBOL(ipv6_dev_get_saddr);
 
+int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
+                     unsigned char banned_flags)
+{
+       struct inet6_ifaddr *ifp;
+       int err = -EADDRNOTAVAIL;
+
+       list_for_each_entry(ifp, &idev->addr_list, if_list) {
+               if (ifp->scope == IFA_LINK &&
+                   !(ifp->flags & banned_flags)) {
+                       *addr = ifp->addr;
+                       err = 0;
+                       break;
+               }
+       }
+       return err;
+}
+
 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
                    unsigned char banned_flags)
 {
@@ -1485,17 +1503,8 @@ int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
        rcu_read_lock();
        idev = __in6_dev_get(dev);
        if (idev) {
-               struct inet6_ifaddr *ifp;
-
                read_lock_bh(&idev->lock);
-               list_for_each_entry(ifp, &idev->addr_list, if_list) {
-                       if (ifp->scope == IFA_LINK &&
-                           !(ifp->flags & banned_flags)) {
-                               *addr = ifp->addr;
-                               err = 0;
-                               break;
-                       }
-               }
+               err = __ipv6_get_lladdr(idev, addr, banned_flags);
                read_unlock_bh(&idev->lock);
        }
        rcu_read_unlock();
@@ -1555,6 +1564,33 @@ static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
        return false;
 }
 
+/* Compares an address/prefix_len with addresses on device @dev.
+ * If one is found it returns true.
+ */
+bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
+       const unsigned int prefix_len, struct net_device *dev)
+{
+       struct inet6_dev *idev;
+       struct inet6_ifaddr *ifa;
+       bool ret = false;
+
+       rcu_read_lock();
+       idev = __in6_dev_get(dev);
+       if (idev) {
+               read_lock_bh(&idev->lock);
+               list_for_each_entry(ifa, &idev->addr_list, if_list) {
+                       ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
+                       if (ret)
+                               break;
+               }
+               read_unlock_bh(&idev->lock);
+       }
+       rcu_read_unlock();
+
+       return ret;
+}
+EXPORT_SYMBOL(ipv6_chk_custom_prefix);
+
 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
 {
        struct inet6_dev *idev;
@@ -2709,8 +2745,18 @@ static void init_loopback(struct net_device *dev)
                        if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
                                continue;
 
-                       if (sp_ifa->rt)
-                               continue;
+                       if (sp_ifa->rt) {
+                               /* This dst has been added to garbage list when
+                                * lo device down, release this obsolete dst and
+                                * reallocate a new router for ifa.
+                                */
+                               if (sp_ifa->rt->dst.obsolete > 0) {
+                                       ip6_rt_put(sp_ifa->rt);
+                                       sp_ifa->rt = NULL;
+                               } else {
+                                       continue;
+                               }
+                       }
 
                        sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);