1 files changed, 43 insertions, 33 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index e4e37edbad60..67c3ed772c27 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -250,7 +250,6 @@ static inline void rt_hash_lock_init(void)
 static struct rt_hash_bucket    *rt_hash_table __read_mostly;
 static unsigned                 rt_hash_mask __read_mostly;
 static unsigned int             rt_hash_log  __read_mostly;
-static atomic_t                 rt_genid __read_mostly;
 
 static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
 #define RT_CACHE_STAT_INC(field) \
@@ -265,6 +264,11 @@ static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx,
                 & rt_hash_mask;
 }
 
+static inline int rt_genid(struct net *net)
+{
+        return atomic_read(&net->ipv4.rt_genid);
+}
+
 #ifdef CONFIG_PROC_FS
 struct rt_cache_iter_state {
         struct seq_net_private p;
@@ -334,7 +338,7 @@ static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
         struct rt_cache_iter_state *st = seq->private;
         if (*pos)
                 return rt_cache_get_idx(seq, *pos - 1);
-        st->genid = atomic_read(&rt_genid);
+        st->genid = rt_genid(seq_file_net(seq));
         return SEQ_START_TOKEN;
 }
 
@@ -681,6 +685,11 @@ static inline int compare_netns(struct rtable *rt1, struct rtable *rt2)
         return dev_net(rt1->u.dst.dev) == dev_net(rt2->u.dst.dev);
 }
 
+static inline int rt_is_expired(struct rtable *rth)
+{
+        return rth->rt_genid != rt_genid(dev_net(rth->u.dst.dev));
+}
+
 /*
  * Perform a full scan of hash table and free all entries.
  * Can be called by a softirq or a process.
@@ -736,7 +745,7 @@ static void rt_check_expire(void)
                         continue;
                 spin_lock_bh(rt_hash_lock_addr(i));
                 while ((rth = *rthp) != NULL) {
-                        if (rth->rt_genid != atomic_read(&rt_genid)) {
+                        if (rt_is_expired(rth)) {
                                 *rthp = rth->u.dst.rt_next;
                                 rt_free(rth);
                                 continue;
@@ -784,7 +793,7 @@ static void rt_cache_invalidate(struct net *net)
         unsigned char shuffle;
 
         get_random_bytes(&shuffle, sizeof(shuffle));
-        atomic_add(shuffle + 1U, &rt_genid);
+        atomic_add(shuffle + 1U, &net->ipv4.rt_genid);
 }
 
 /*
@@ -881,7 +890,7 @@ static int rt_garbage_collect(struct dst_ops *ops)
                         rthp = &rt_hash_table[k].chain;
                         spin_lock_bh(rt_hash_lock_addr(k));
                         while ((rth = *rthp) != NULL) {
-                                if (rth->rt_genid == atomic_read(&rt_genid) &&
+                                if (!rt_is_expired(rth) &&
                                         !rt_may_expire(rth, tmo, expire)) {
                                         tmo >>= 1;
                                         rthp = &rth->u.dst.rt_next;
@@ -963,7 +972,7 @@ restart:
 
         spin_lock_bh(rt_hash_lock_addr(hash));
         while ((rth = *rthp) != NULL) {
-                if (rth->rt_genid != atomic_read(&rt_genid)) {
+                if (rt_is_expired(rth)) {
                         *rthp = rth->u.dst.rt_next;
                         rt_free(rth);
                         continue;
@@ -1139,7 +1148,7 @@ static void rt_del(unsigned hash, struct rtable *rt)
         spin_lock_bh(rt_hash_lock_addr(hash));
         ip_rt_put(rt);
         while ((aux = *rthp) != NULL) {
-                if (aux == rt || (aux->rt_genid != atomic_read(&rt_genid))) {
+                if (aux == rt || rt_is_expired(aux)) {
                         *rthp = aux->u.dst.rt_next;
                         rt_free(aux);
                         continue;
@@ -1182,7 +1191,7 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
         for (i = 0; i < 2; i++) {
                 for (k = 0; k < 2; k++) {
                         unsigned hash = rt_hash(daddr, skeys[i], ikeys[k],
-                                                atomic_read(&rt_genid));
+                                                rt_genid(net));
 
                         rthp=&rt_hash_table[hash].chain;
 
@@ -1194,7 +1203,7 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
                                     rth->fl.fl4_src != skeys[i] ||
                                     rth->fl.oif != ikeys[k] ||
                                     rth->fl.iif != 0 ||
-                                    rth->rt_genid != atomic_read(&rt_genid) ||
+                                    rt_is_expired(rth) ||
                                     !net_eq(dev_net(rth->u.dst.dev), net)) {
                                         rthp = &rth->u.dst.rt_next;
                                         continue;
@@ -1233,7 +1242,7 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
                                 rt->u.dst.neighbour     = NULL;
                                 rt->u.dst.hh            = NULL;
                                 rt->u.dst.xfrm          = NULL;
-                                rt->rt_genid            = atomic_read(&rt_genid);
+                                rt->rt_genid            = rt_genid(net);
                                 rt->rt_flags            |= RTCF_REDIRECTED;
 
                                 /* Gateway is different ... */
@@ -1298,7 +1307,7 @@ static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
                            rt->u.dst.expires) {
                         unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src,
                                                 rt->fl.oif,
-                                                atomic_read(&rt_genid));
+                                                rt_genid(dev_net(dst->dev)));
 #if RT_CACHE_DEBUG >= 1
                         printk(KERN_DEBUG "ipv4_negative_advice: redirect to "
                                           NIPQUAD_FMT "/%02x dropped\n",
@@ -1448,7 +1457,7 @@ unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
         for (k = 0; k < 2; k++) {
                 for (i = 0; i < 2; i++) {
                         unsigned hash = rt_hash(daddr, skeys[i], ikeys[k],
-                                                atomic_read(&rt_genid));
+                                                rt_genid(net));
 
                         rcu_read_lock();
                         for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
@@ -1463,7 +1472,7 @@ unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
                                     rth->fl.iif != 0 ||
                                     dst_metric_locked(&rth->u.dst, RTAX_MTU) ||
                                     !net_eq(dev_net(rth->u.dst.dev), net) ||
-                                    rth->rt_genid != atomic_read(&rt_genid))
+                                    !rt_is_expired(rth))
                                         continue;
 
                                 if (new_mtu < 68 || new_mtu >= old_mtu) {
@@ -1698,7 +1707,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
         rth->fl.oif     = 0;
         rth->rt_gateway = daddr;
         rth->rt_spec_dst= spec_dst;
-        rth->rt_genid   = atomic_read(&rt_genid);
+        rth->rt_genid   = rt_genid(dev_net(dev));
         rth->rt_flags   = RTCF_MULTICAST;
         rth->rt_type    = RTN_MULTICAST;
         if (our) {
@@ -1713,7 +1722,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
         RT_CACHE_STAT_INC(in_slow_mc);
 
         in_dev_put(in_dev);
-        hash = rt_hash(daddr, saddr, dev->ifindex, atomic_read(&rt_genid));
+        hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev)));
         return rt_intern_hash(hash, rth, &skb->rtable);
 
 e_nobufs:
@@ -1839,7 +1848,7 @@ static int __mkroute_input(struct sk_buff *skb,
 
         rth->u.dst.input = ip_forward;
         rth->u.dst.output = ip_output;
-        rth->rt_genid = atomic_read(&rt_genid);
+        rth->rt_genid = rt_genid(dev_net(rth->u.dst.dev));
 
         rt_set_nexthop(rth, res, itag);
 
@@ -1874,7 +1883,8 @@ static int ip_mkroute_input(struct sk_buff *skb,
                 return err;
 
         /* put it into the cache */
-        hash = rt_hash(daddr, saddr, fl->iif, atomic_read(&rt_genid));
+        hash = rt_hash(daddr, saddr, fl->iif,
+                       rt_genid(dev_net(rth->u.dst.dev)));
         return rt_intern_hash(hash, rth, &skb->rtable);
 }
 
@@ -2000,7 +2010,7 @@ local_input:
                 goto e_nobufs;
 
         rth->u.dst.output= ip_rt_bug;
-        rth->rt_genid = atomic_read(&rt_genid);
+        rth->rt_genid = rt_genid(net);
 
         atomic_set(&rth->u.dst.__refcnt, 1);
         rth->u.dst.flags= DST_HOST;
@@ -2030,7 +2040,7 @@ local_input:
                 rth->rt_flags   &= ~RTCF_LOCAL;
         }
         rth->rt_type    = res.type;
-        hash = rt_hash(daddr, saddr, fl.iif, atomic_read(&rt_genid));
+        hash = rt_hash(daddr, saddr, fl.iif, rt_genid(net));
         err = rt_intern_hash(hash, rth, &skb->rtable);
         goto done;
 
@@ -2081,7 +2091,7 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 
         net = dev_net(dev);
         tos &= IPTOS_RT_MASK;
-        hash = rt_hash(daddr, saddr, iif, atomic_read(&rt_genid));
+        hash = rt_hash(daddr, saddr, iif, rt_genid(net));
 
         rcu_read_lock();
         for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
@@ -2093,7 +2103,7 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
                      (rth->fl.fl4_tos ^ tos)) == 0 &&
                     rth->fl.mark == skb->mark &&
                     net_eq(dev_net(rth->u.dst.dev), net) &&
-                    rth->rt_genid == atomic_read(&rt_genid)) {
+                    !rt_is_expired(rth)) {
                         dst_use(&rth->u.dst, jiffies);
                         RT_CACHE_STAT_INC(in_hit);
                         rcu_read_unlock();
@@ -2221,7 +2231,7 @@ static int __mkroute_output(struct rtable **result,
         rth->rt_spec_dst= fl->fl4_src;
 
         rth->u.dst.output=ip_output;
-        rth->rt_genid = atomic_read(&rt_genid);
+        rth->rt_genid = rt_genid(dev_net(dev_out));
 
         RT_CACHE_STAT_INC(out_slow_tot);
 
@@ -2271,7 +2281,7 @@ static int ip_mkroute_output(struct rtable **rp,
         unsigned hash;
         if (err == 0) {
                 hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif,
-                               atomic_read(&rt_genid));
+                               rt_genid(dev_net(dev_out)));
                 err = rt_intern_hash(hash, rth, rp);
         }
 
@@ -2483,8 +2493,7 @@ int __ip_route_output_key(struct net *net, struct rtable **rp,
         unsigned hash;
         struct rtable *rth;
 
-        hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif,
-                       atomic_read(&rt_genid));
+        hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif, rt_genid(net));
 
         rcu_read_lock_bh();
         for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
@@ -2497,7 +2506,7 @@ int __ip_route_output_key(struct net *net, struct rtable **rp,
                     !((rth->fl.fl4_tos ^ flp->fl4_tos) &
                             (IPTOS_RT_MASK | RTO_ONLINK)) &&
                     net_eq(dev_net(rth->u.dst.dev), net) &&
-                    rth->rt_genid == atomic_read(&rt_genid)) {
+                    !rt_is_expired(rth)) {
                         dst_use(&rth->u.dst, jiffies);
                         RT_CACHE_STAT_INC(out_hit);
                         rcu_read_unlock_bh();
@@ -2528,7 +2537,7 @@ static struct dst_ops ipv4_dst_blackhole_ops = {
 };
 
 
-static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp)
+static int ipv4_dst_blackhole(struct net *net, struct rtable **rp, struct flowi *flp)
 {
         struct rtable *ort = *rp;
         struct rtable *rt = (struct rtable *)
@@ -2552,7 +2561,7 @@ static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp)
                 rt->idev = ort->idev;
                 if (rt->idev)
                         in_dev_hold(rt->idev);
-                rt->rt_genid = atomic_read(&rt_genid);
+                rt->rt_genid = rt_genid(net);
                 rt->rt_flags = ort->rt_flags;
                 rt->rt_type = ort->rt_type;
                 rt->rt_dst = ort->rt_dst;
@@ -2588,7 +2597,7 @@ int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp,
                 err = __xfrm_lookup((struct dst_entry **)rp, flp, sk,
                                     flags ? XFRM_LOOKUP_WAIT : 0);
                 if (err == -EREMOTE)
-                        err = ipv4_dst_blackhole(rp, flp);
+                        err = ipv4_dst_blackhole(net, rp, flp);
 
                 return err;
         }
@@ -2807,7 +2816,7 @@ int ip_rt_dump(struct sk_buff *skb,  struct netlink_callback *cb)
                      rt = rcu_dereference(rt->u.dst.rt_next), idx++) {
                         if (!net_eq(dev_net(rt->u.dst.dev), net) || idx < s_idx)
                                 continue;
-                        if (rt->rt_genid != atomic_read(&rt_genid))
+                        if (rt_is_expired(rt))
                                 continue;
                         skb->dst = dst_clone(&rt->u.dst);
                         if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
@@ -3081,6 +3090,10 @@ static __net_initdata struct pernet_operations sysctl_route_ops = {
 
 static __net_init int rt_secret_timer_init(struct net *net)
 {
+        atomic_set(&net->ipv4.rt_genid,
+                        (int) ((num_physpages ^ (num_physpages>>8)) ^
+                        (jiffies ^ (jiffies >> 7))));
+
         net->ipv4.rt_secret_timer.function = rt_secret_rebuild;
         net->ipv4.rt_secret_timer.data = (unsigned long)net;
         init_timer_deferrable(&net->ipv4.rt_secret_timer);
@@ -3121,9 +3134,6 @@ int __init ip_rt_init(void)
 {
         int rc = 0;
 
-        atomic_set(&rt_genid, (int) ((num_physpages ^ (num_physpages>>8)) ^
-                             (jiffies ^ (jiffies >> 7))));
-
 #ifdef CONFIG_NET_CLS_ROUTE
         ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct));
         if (!ip_rt_acct)