ipv6: Don't put artificial limit on routing table size.

IPV6, unlike IPV4, doesn't have a routing cache.

Routing table entries, as well as clones made in response
to route lookup requests, all live in the same table.  And
all of these things are together collected in the destination
cache table for ipv6.

This means that routing table entries count against the garbage
collection limits, even though such entries cannot ever be reclaimed
and are added explicitly by the administrator (rather than being
created in response to lookups).

Therefore it makes no sense to count ipv6 routing table entries
against the GC limits.

Add a DST_NOCOUNT destination cache entry flag, and skip the counting
if it is set.  Use this flag bit in ipv6 when adding routing table
entries.

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 12 insertions, 8 deletions

diff --git a/include/net/dst.h b/include/net/dst.h
index 7d15d238b6ec..e12ddfb9eb16 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -77,6 +77,7 @@ struct dst_entry {
 #define DST_NOPOLICY            0x0004
 #define DST_NOHASH              0x0008
 #define DST_NOCACHE             0x0010
+#define DST_NOCOUNT             0x0020
         union {
                 struct dst_entry        *next;
                 struct rtable __rcu     *rt_next;
diff --git a/net/core/dst.c b/net/core/dst.c
index 9ccca038444f..6135f3671692 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -190,7 +190,8 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
         dst->lastuse = jiffies;
         dst->flags = flags;
         dst->next = NULL;
-        dst_entries_add(ops, 1);
+        if (!(flags & DST_NOCOUNT))
+                dst_entries_add(ops, 1);
         return dst;
 }
 EXPORT_SYMBOL(dst_alloc);
@@ -243,7 +244,8 @@ again:
                 neigh_release(neigh);
         }
 
-        dst_entries_add(dst->ops, -1);
+        if (!(dst->flags & DST_NOCOUNT))
+                dst_entries_add(dst->ops, -1);
 
         if (dst->ops->destroy)
                 dst->ops->destroy(dst);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index c2af4da074b0..0ef1f086feb8 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -228,9 +228,10 @@ static struct rt6_info ip6_blk_hole_entry_template = {
 
 /* allocate dst with ip6_dst_ops */
 static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops,
-                                             struct net_device *dev)
+                                             struct net_device *dev,
+                                             int flags)
 {
-        struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, 0);
+        struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags);
 
         memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry));
 
@@ -1042,7 +1043,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
         if (unlikely(idev == NULL))
                 return NULL;
 
-        rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev);
+        rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0);
         if (unlikely(rt == NULL)) {
                 in6_dev_put(idev);
                 goto out;
@@ -1206,7 +1207,7 @@ int ip6_route_add(struct fib6_config *cfg)
                 goto out;
         }
 
-        rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL);
+        rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT);
 
         if (rt == NULL) {
                 err = -ENOMEM;
@@ -1726,7 +1727,7 @@ static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
 {
         struct net *net = dev_net(ort->rt6i_dev);
         struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
-                                            ort->dst.dev);
+                                            ort->dst.dev, 0);
 
         if (rt) {
                 rt->dst.input = ort->dst.input;
@@ -2005,7 +2006,7 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 {
         struct net *net = dev_net(idev->dev);
         struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
-                                            net->loopback_dev);
+                                            net->loopback_dev, 0);
         struct neighbour *neigh;
 
         if (rt == NULL) {