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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[cascardo/linux.git] / net / ipv6 / addrconf.c
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index d8983e1..060dd99 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -147,9 +147,8 @@ static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 }
 #endif
 
-static void __ipv6_regen_rndid(struct inet6_dev *idev);
-static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
-static void ipv6_regen_rndid(unsigned long data);
+static void ipv6_regen_rndid(struct inet6_dev *idev);
+static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 
 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 static int ipv6_count_addresses(struct inet6_dev *idev);
@@ -409,9 +408,7 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
                goto err_release;
        }
 
-       /* One reference from device.  We must do this before
-        * we invoke __ipv6_regen_rndid().
-        */
+       /* One reference from device. */
        in6_dev_hold(ndev);
 
        if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
@@ -425,17 +422,15 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 #endif
 
        INIT_LIST_HEAD(&ndev->tempaddr_list);
-       setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
+       ndev->desync_factor = U32_MAX;
        if ((dev->flags&IFF_LOOPBACK) ||
            dev->type == ARPHRD_TUNNEL ||
            dev->type == ARPHRD_TUNNEL6 ||
            dev->type == ARPHRD_SIT ||
            dev->type == ARPHRD_NONE) {
                ndev->cnf.use_tempaddr = -1;
-       } else {
-               in6_dev_hold(ndev);
-               ipv6_regen_rndid((unsigned long) ndev);
-       }
+       } else
+               ipv6_regen_rndid(ndev);
 
        ndev->token = in6addr_any;
 
@@ -447,7 +442,6 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
        err = addrconf_sysctl_register(ndev);
        if (err) {
                ipv6_mc_destroy_dev(ndev);
-               del_timer(&ndev->regen_timer);
                snmp6_unregister_dev(ndev);
                goto err_release;
        }
@@ -1190,6 +1184,8 @@ static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *i
        int ret = 0;
        u32 addr_flags;
        unsigned long now = jiffies;
+       long max_desync_factor;
+       s32 cnf_temp_preferred_lft;
 
        write_lock_bh(&idev->lock);
        if (ift) {
@@ -1222,23 +1218,42 @@ retry:
        }
        in6_ifa_hold(ifp);
        memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
-       __ipv6_try_regen_rndid(idev, tmpaddr);
+       ipv6_try_regen_rndid(idev, tmpaddr);
        memcpy(&addr.s6_addr[8], idev->rndid, 8);
        age = (now - ifp->tstamp) / HZ;
+
+       regen_advance = idev->cnf.regen_max_retry *
+                       idev->cnf.dad_transmits *
+                       NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
+
+       /* recalculate max_desync_factor each time and update
+        * idev->desync_factor if it's larger
+        */
+       cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
+       max_desync_factor = min_t(__u32,
+                                 idev->cnf.max_desync_factor,
+                                 cnf_temp_preferred_lft - regen_advance);
+
+       if (unlikely(idev->desync_factor > max_desync_factor)) {
+               if (max_desync_factor > 0) {
+                       get_random_bytes(&idev->desync_factor,
+                                        sizeof(idev->desync_factor));
+                       idev->desync_factor %= max_desync_factor;
+               } else {
+                       idev->desync_factor = 0;
+               }
+       }
+
        tmp_valid_lft = min_t(__u32,
                              ifp->valid_lft,
                              idev->cnf.temp_valid_lft + age);
-       tmp_prefered_lft = min_t(__u32,
-                                ifp->prefered_lft,
-                                idev->cnf.temp_prefered_lft + age -
-                                idev->cnf.max_desync_factor);
+       tmp_prefered_lft = cnf_temp_preferred_lft + age -
+                           idev->desync_factor;
+       tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
        tmp_plen = ifp->prefix_len;
        tmp_tstamp = ifp->tstamp;
        spin_unlock_bh(&ifp->lock);
 
-       regen_advance = idev->cnf.regen_max_retry *
-                       idev->cnf.dad_transmits *
-                       NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
        write_unlock_bh(&idev->lock);
 
        /* A temporary address is created only if this calculated Preferred
@@ -2150,7 +2165,7 @@ static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
 }
 
 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
-static void __ipv6_regen_rndid(struct inet6_dev *idev)
+static void ipv6_regen_rndid(struct inet6_dev *idev)
 {
 regen:
        get_random_bytes(idev->rndid, sizeof(idev->rndid));
@@ -2179,43 +2194,10 @@ regen:
        }
 }
 
-static void ipv6_regen_rndid(unsigned long data)
-{
-       struct inet6_dev *idev = (struct inet6_dev *) data;
-       unsigned long expires;
-
-       rcu_read_lock_bh();
-       write_lock_bh(&idev->lock);
-
-       if (idev->dead)
-               goto out;
-
-       __ipv6_regen_rndid(idev);
-
-       expires = jiffies +
-               idev->cnf.temp_prefered_lft * HZ -
-               idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
-               NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
-               idev->cnf.max_desync_factor * HZ;
-       if (time_before(expires, jiffies)) {
-               pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
-                       __func__, idev->dev->name);
-               goto out;
-       }
-
-       if (!mod_timer(&idev->regen_timer, expires))
-               in6_dev_hold(idev);
-
-out:
-       write_unlock_bh(&idev->lock);
-       rcu_read_unlock_bh();
-       in6_dev_put(idev);
-}
-
-static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
+static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
 {
        if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
-               __ipv6_regen_rndid(idev);
+               ipv6_regen_rndid(idev);
 }
 
 /*
@@ -2356,7 +2338,7 @@ static void manage_tempaddrs(struct inet6_dev *idev,
                        max_valid = 0;
 
                max_prefered = idev->cnf.temp_prefered_lft -
-                              idev->cnf.max_desync_factor - age;
+                              idev->desync_factor - age;
                if (max_prefered < 0)
                        max_prefered = 0;
 
@@ -3018,7 +3000,7 @@ static void init_loopback(struct net_device *dev)
                                 * lo device down, release this obsolete dst and
                                 * reallocate a new router for ifa.
                                 */
-                               if (sp_ifa->rt->dst.obsolete > 0) {
+                               if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
                                        ip6_rt_put(sp_ifa->rt);
                                        sp_ifa->rt = NULL;
                                } else {
@@ -3594,9 +3576,6 @@ restart:
        if (!how)
                idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
 
-       if (how && del_timer(&idev->regen_timer))
-               in6_dev_put(idev);
-
        /* Step 3: clear tempaddr list */
        while (!list_empty(&idev->tempaddr_list)) {
                ifa = list_first_entry(&idev->tempaddr_list,
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