ipv6: Complete neighbour entry removal from dst_entry.

CC: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 83 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index afc8386e3d9f..3a562a103312 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -151,19 +151,6 @@ static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
         return neigh_create(&nd_tbl, daddr, dst->dev);
 }
 
-static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev)
-{
-        struct neighbour *n = __ipv6_neigh_lookup(dev, &rt->rt6i_gateway);
-        if (!n) {
-                n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev);
-                if (IS_ERR(n))
-                        return PTR_ERR(n);
-        }
-        rt->n = n;
-
-        return 0;
-}
-
 static struct dst_ops ip6_dst_ops_template = {
         .family                 =       AF_INET6,
         .protocol               =       cpu_to_be16(ETH_P_IPV6),
@@ -301,9 +288,6 @@ static void ip6_dst_destroy(struct dst_entry *dst)
         struct rt6_info *rt = (struct rt6_info *)dst;
         struct inet6_dev *idev = rt->rt6i_idev;
 
-        if (rt->n)
-                neigh_release(rt->n);
-
         if (!(rt->dst.flags & DST_HOST))
                 dst_destroy_metrics_generic(dst);
 
@@ -354,11 +338,6 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
                                 in6_dev_put(idev);
                         }
                 }
-                if (rt->n && rt->n->dev == dev) {
-                        rt->n->dev = loopback_dev;
-                        dev_hold(loopback_dev);
-                        dev_put(dev);
-                }
         }
 }
 
@@ -845,8 +824,6 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
         rt = ip6_rt_copy(ort, daddr);
 
         if (rt) {
-                int attempts = !in_softirq();
-
                 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
                         if (ort->rt6i_dst.plen != 128 &&
                             ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
@@ -862,32 +839,6 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
                         rt->rt6i_src.plen = 128;
                 }
 #endif
-
-        retry:
-                if (rt6_bind_neighbour(rt, rt->dst.dev)) {
-                        struct net *net = dev_net(rt->dst.dev);
-                        int saved_rt_min_interval =
-                                net->ipv6.sysctl.ip6_rt_gc_min_interval;
-                        int saved_rt_elasticity =
-                                net->ipv6.sysctl.ip6_rt_gc_elasticity;
-
-                        if (attempts-- > 0) {
-                                net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
-                                net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;
-
-                                ip6_dst_gc(&net->ipv6.ip6_dst_ops);
-
-                                net->ipv6.sysctl.ip6_rt_gc_elasticity =
-                                        saved_rt_elasticity;
-                                net->ipv6.sysctl.ip6_rt_gc_min_interval =
-                                        saved_rt_min_interval;
-                                goto retry;
-                        }
-
-                        net_warn_ratelimited("Neighbour table overflow\n");
-                        dst_free(&rt->dst);
-                        return NULL;
-                }
         }
 
         return rt;
@@ -898,10 +849,8 @@ static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
 {
         struct rt6_info *rt = ip6_rt_copy(ort, daddr);
 
-        if (rt) {
+        if (rt)
                 rt->rt6i_flags |= RTF_CACHE;
-                rt->n = neigh_clone(ort->n);
-        }
         return rt;
 }
 
@@ -1272,20 +1221,8 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
                 goto out;
         }
 
-        if (neigh)
-                neigh_hold(neigh);
-        else {
-                neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr);
-                if (IS_ERR(neigh)) {
-                        in6_dev_put(idev);
-                        dst_free(&rt->dst);
-                        return ERR_CAST(neigh);
-                }
-        }
-
         rt->dst.flags |= DST_HOST;
         rt->dst.output  = ip6_output;
-        rt->n = neigh;
         atomic_set(&rt->dst.__refcnt, 1);
         rt->rt6i_dst.addr = fl6->daddr;
         rt->rt6i_dst.plen = 128;
@@ -1594,12 +1531,6 @@ int ip6_route_add(struct fib6_config *cfg)
         } else
                 rt->rt6i_prefsrc.plen = 0;
 
-        if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
-                err = rt6_bind_neighbour(rt, dev);
-                if (err)
-                        goto out;
-        }
-
         rt->rt6i_flags = cfg->fc_flags;
 
 install_route:
@@ -1713,7 +1644,6 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
         struct netevent_redirect netevent;
         struct rt6_info *rt, *nrt = NULL;
         struct ndisc_options ndopts;
-        struct neighbour *old_neigh;
         struct inet6_dev *in6_dev;
         struct neighbour *neigh;
         struct rd_msg *msg;
@@ -1786,11 +1716,6 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
         if (!neigh)
                 return;
 
-        /* Duplicate redirect: silently ignore. */
-        old_neigh = rt->n;
-        if (neigh == old_neigh)
-                goto out;
-
         /*
          *      We have finally decided to accept it.
          */
@@ -1811,7 +1736,6 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
                 nrt->rt6i_flags &= ~RTF_GATEWAY;
 
         nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
-        nrt->n = neigh_clone(neigh);
 
         if (ip6_ins_rt(nrt))
                 goto out;
@@ -2125,7 +2049,6 @@ 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, net->loopback_dev, 0, NULL);
-        int err;
 
         if (!rt) {
                 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
@@ -2144,11 +2067,6 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
                 rt->rt6i_flags |= RTF_ANYCAST;
         else
                 rt->rt6i_flags |= RTF_LOCAL;
-        err = rt6_bind_neighbour(rt, rt->dst.dev);
-        if (err) {
-                dst_free(&rt->dst);
-                return ERR_PTR(err);
-        }
 
         rt->rt6i_dst.addr = *addr;
         rt->rt6i_dst.plen = 128;