decnet: Use neighbours privately in dn_route struct.

This allows an easy conversion away from dst_get_neighbour*().

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

1 files changed, 29 insertions, 7 deletions

diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 60e4c6e1bac0..6e74b3f110bc 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -114,6 +114,7 @@ static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
 static unsigned int dn_dst_default_advmss(const struct dst_entry *dst);
 static unsigned int dn_dst_mtu(const struct dst_entry *dst);
 static void dn_dst_destroy(struct dst_entry *);
+static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how);
 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
 static void dn_dst_link_failure(struct sk_buff *);
 static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);
@@ -140,6 +141,7 @@ static struct dst_ops dn_dst_ops = {
         .mtu =                  dn_dst_mtu,
         .cow_metrics =          dst_cow_metrics_generic,
         .destroy =              dn_dst_destroy,
+        .ifdown =               dn_dst_ifdown,
         .negative_advice =      dn_dst_negative_advice,
         .link_failure =         dn_dst_link_failure,
         .update_pmtu =          dn_dst_update_pmtu,
@@ -148,9 +150,27 @@ static struct dst_ops dn_dst_ops = {
 
 static void dn_dst_destroy(struct dst_entry *dst)
 {
+        struct dn_route *rt = (struct dn_route *) dst;
+
+        if (rt->n)
+                neigh_release(rt->n);
         dst_destroy_metrics_generic(dst);
 }
 
+static void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how)
+{
+        if (how) {
+                struct dn_route *rt = (struct dn_route *) dst;
+                struct neighbour *n = rt->n;
+
+                if (n && n->dev == dev) {
+                        n->dev = dev_net(dev)->loopback_dev;
+                        dev_hold(n->dev);
+                        dev_put(dev);
+                }
+        }
+}
+
 static __inline__ unsigned int dn_hash(__le16 src, __le16 dst)
 {
         __u16 tmp = (__u16 __force)(src ^ dst);
@@ -246,7 +266,8 @@ static int dn_dst_gc(struct dst_ops *ops)
  */
 static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu)
 {
-        struct neighbour *n = dst_get_neighbour_noref(dst);
+        struct dn_route *rt = (struct dn_route *) dst;
+        struct neighbour *n = rt->n;
         u32 min_mtu = 230;
         struct dn_dev *dn;
 
@@ -715,7 +736,8 @@ out:
 static int dn_to_neigh_output(struct sk_buff *skb)
 {
         struct dst_entry *dst = skb_dst(skb);
-        struct neighbour *n = dst_get_neighbour_noref(dst);
+        struct dn_route *rt = (struct dn_route *) dst;
+        struct neighbour *n = rt->n;
 
         return n->output(n, skb);
 }
@@ -729,7 +751,7 @@ static int dn_output(struct sk_buff *skb)
 
         int err = -EINVAL;
 
-        if (dst_get_neighbour_noref(dst) == NULL)
+        if (rt->n == NULL)
                 goto error;
 
         skb->dev = dev;
@@ -852,11 +874,11 @@ static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
         }
         rt->rt_type = res->type;
 
-        if (dev != NULL && dst_get_neighbour_noref(&rt->dst) == NULL) {
+        if (dev != NULL && rt->n == NULL) {
                 n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
                 if (IS_ERR(n))
                         return PTR_ERR(n);
-                dst_set_neighbour(&rt->dst, n);
+                rt->n = n;
         }
 
         if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu)
@@ -1163,7 +1185,7 @@ make_route:
         rt->rt_dst_map    = fld.daddr;
         rt->rt_src_map    = fld.saddr;
 
-        dst_set_neighbour(&rt->dst, neigh);
+        rt->n = neigh;
         neigh = NULL;
 
         rt->dst.lastuse = jiffies;
@@ -1433,7 +1455,7 @@ make_route:
         rt->fld.flowidn_iif  = in_dev->ifindex;
         rt->fld.flowidn_mark = fld.flowidn_mark;
 
-        dst_set_neighbour(&rt->dst, neigh);
+        rt->n = neigh;
         rt->dst.lastuse = jiffies;
         rt->dst.output = dn_rt_bug;
         switch (res.type) {