net: Use non-zero allocations in dst_alloc().

Make dst_alloc() and it's users explicitly initialize the entire
entry.

The zero'ing done by kmem_cache_zalloc() was almost entirely
redundant.

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

5 files changed, 74 insertions, 35 deletions

diff --git a/net/core/dst.c b/net/core/dst.c
index 9505778ec800..30f009327b62 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -175,22 +175,36 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
                 if (ops->gc(ops))
                         return NULL;
         }
-        dst = kmem_cache_zalloc(ops->kmem_cachep, GFP_ATOMIC);
+        dst = kmem_cache_alloc(ops->kmem_cachep, GFP_ATOMIC);
         if (!dst)
                 return NULL;
-        dst->ops = ops;
+        dst->child = NULL;
         dst->dev = dev;
         if (dev)
                 dev_hold(dev);
+        dst->ops = ops;
         dst_init_metrics(dst, dst_default_metrics, true);
+        dst->expires = 0UL;
         dst->path = dst;
+        dst->neighbour = NULL;
+        dst->hh = NULL;
+#ifdef CONFIG_XFRM
+        dst->xfrm = NULL;
+#endif
         dst->input = dst_discard;
         dst->output = dst_discard;
-
+        dst->error = 0;
         dst->obsolete = initial_obsolete;
+        dst->header_len = 0;
+        dst->trailer_len = 0;
+#ifdef CONFIG_IP_ROUTE_CLASSID
+        dst->tclassid = 0;
+#endif
         atomic_set(&dst->__refcnt, initial_ref);
+        dst->__use = 0;
         dst->lastuse = jiffies;
         dst->flags = flags;
+        dst->next = NULL;
 #if RT_CACHE_DEBUG >= 2
         atomic_inc(&dst_total);
 #endif
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index f489b081c25d..74544bc6fdec 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -1129,6 +1129,7 @@ make_route:
         if (rt == NULL)
                 goto e_nobufs;
 
+        memset(&rt->fld, 0, sizeof(rt->fld));
         rt->fld.saddr        = oldflp->saddr;
         rt->fld.daddr        = oldflp->daddr;
         rt->fld.flowidn_oif  = oldflp->flowidn_oif;
@@ -1398,6 +1399,7 @@ make_route:
         if (rt == NULL)
                 goto e_nobufs;
 
+        memset(&rt->fld, 0, sizeof(rt->fld));
         rt->rt_saddr      = fld.saddr;
         rt->rt_daddr      = fld.daddr;
         rt->rt_gateway    = fld.daddr;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index b471d89b57ee..fb9211adf079 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1830,7 +1830,6 @@ static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *oldflp4,
 #endif
         set_class_tag(rt, itag);
 #endif
-        rt->rt_type = type;
 }
 
 static struct rtable *rt_dst_alloc(struct net_device *dev,
@@ -1877,25 +1876,28 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
         if (!rth)
                 goto e_nobufs;
 
+#ifdef CONFIG_IP_ROUTE_CLASSID
+        rth->dst.tclassid = itag;
+#endif
         rth->dst.output = ip_rt_bug;
 
         rth->rt_key_dst = daddr;
-        rth->rt_dst     = daddr;
-        rth->rt_tos     = tos;
-        rth->rt_mark    = skb->mark;
         rth->rt_key_src = saddr;
+        rth->rt_genid   = rt_genid(dev_net(dev));
+        rth->rt_flags   = RTCF_MULTICAST;
+        rth->rt_type    = RTN_MULTICAST;
+        rth->rt_tos     = tos;
+        rth->rt_dst     = daddr;
         rth->rt_src     = saddr;
-#ifdef CONFIG_IP_ROUTE_CLASSID
-        rth->dst.tclassid = itag;
-#endif
         rth->rt_route_iif = dev->ifindex;
         rth->rt_iif     = dev->ifindex;
         rth->rt_oif     = 0;
+        rth->rt_mark    = skb->mark;
         rth->rt_gateway = daddr;
         rth->rt_spec_dst= spec_dst;
-        rth->rt_genid   = rt_genid(dev_net(dev));
-        rth->rt_flags   = RTCF_MULTICAST;
-        rth->rt_type    = RTN_MULTICAST;
+        rth->rt_peer_genid = 0;
+        rth->peer = NULL;
+        rth->fi = NULL;
         if (our) {
                 rth->dst.input= ip_local_deliver;
                 rth->rt_flags |= RTCF_LOCAL;
@@ -2017,25 +2019,28 @@ static int __mkroute_input(struct sk_buff *skb,
         }
 
         rth->rt_key_dst = daddr;
-        rth->rt_dst     = daddr;
-        rth->rt_tos     = tos;
-        rth->rt_mark    = skb->mark;
         rth->rt_key_src = saddr;
+        rth->rt_genid = rt_genid(dev_net(rth->dst.dev));
+        rth->rt_flags = flags;
+        rth->rt_type = res->type;
+        rth->rt_tos     = tos;
+        rth->rt_dst     = daddr;
         rth->rt_src     = saddr;
-        rth->rt_gateway = daddr;
         rth->rt_route_iif = in_dev->dev->ifindex;
         rth->rt_iif     = in_dev->dev->ifindex;
         rth->rt_oif     = 0;
+        rth->rt_mark    = skb->mark;
+        rth->rt_gateway = daddr;
         rth->rt_spec_dst= spec_dst;
+        rth->rt_peer_genid = 0;
+        rth->peer = NULL;
+        rth->fi = NULL;
 
         rth->dst.input = ip_forward;
         rth->dst.output = ip_output;
-        rth->rt_genid = rt_genid(dev_net(rth->dst.dev));
 
         rt_set_nexthop(rth, NULL, res, res->fi, res->type, itag);
 
-        rth->rt_flags = flags;
-
         *result = rth;
         err = 0;
  cleanup:
@@ -2187,30 +2192,37 @@ local_input:
         if (!rth)
                 goto e_nobufs;
 
+        rth->dst.input= ip_local_deliver;
         rth->dst.output= ip_rt_bug;
-        rth->rt_genid = rt_genid(net);
+#ifdef CONFIG_IP_ROUTE_CLASSID
+        rth->dst.tclassid = itag;
+#endif
 
         rth->rt_key_dst = daddr;
-        rth->rt_dst     = daddr;
-        rth->rt_tos     = tos;
-        rth->rt_mark    = skb->mark;
         rth->rt_key_src = saddr;
+        rth->rt_genid = rt_genid(net);
+        rth->rt_flags   = flags|RTCF_LOCAL;
+        rth->rt_type    = res.type;
+        rth->rt_tos     = tos;
+        rth->rt_dst     = daddr;
         rth->rt_src     = saddr;
 #ifdef CONFIG_IP_ROUTE_CLASSID
         rth->dst.tclassid = itag;
 #endif
         rth->rt_route_iif = dev->ifindex;
         rth->rt_iif     = dev->ifindex;
+        rth->rt_oif     = 0;
+        rth->rt_mark    = skb->mark;
         rth->rt_gateway = daddr;
         rth->rt_spec_dst= spec_dst;
-        rth->dst.input= ip_local_deliver;
-        rth->rt_flags   = flags|RTCF_LOCAL;
+        rth->rt_peer_genid = 0;
+        rth->peer = NULL;
+        rth->fi = NULL;
         if (res.type == RTN_UNREACHABLE) {
                 rth->dst.input= ip_error;
                 rth->dst.error= -err;
                 rth->rt_flags   &= ~RTCF_LOCAL;
         }
-        rth->rt_type    = res.type;
         hash = rt_hash(daddr, saddr, fl4.flowi4_iif, rt_genid(net));
         rth = rt_intern_hash(hash, rth, skb, fl4.flowi4_iif);
         err = 0;
@@ -2391,20 +2403,25 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
         if (!rth)
                 return ERR_PTR(-ENOBUFS);
 
+        rth->dst.output = ip_output;
+
         rth->rt_key_dst = oldflp4->daddr;
-        rth->rt_tos     = tos;
         rth->rt_key_src = oldflp4->saddr;
-        rth->rt_oif     = oldflp4->flowi4_oif;
-        rth->rt_mark    = oldflp4->flowi4_mark;
+        rth->rt_genid = rt_genid(dev_net(dev_out));
+        rth->rt_flags   = flags;
+        rth->rt_type    = type;
+        rth->rt_tos     = tos;
         rth->rt_dst     = fl4->daddr;
         rth->rt_src     = fl4->saddr;
         rth->rt_route_iif = 0;
         rth->rt_iif     = oldflp4->flowi4_oif ? : dev_out->ifindex;
+        rth->rt_oif     = oldflp4->flowi4_oif;
+        rth->rt_mark    = oldflp4->flowi4_mark;
         rth->rt_gateway = fl4->daddr;
         rth->rt_spec_dst= fl4->saddr;
-
-        rth->dst.output=ip_output;
-        rth->rt_genid = rt_genid(dev_net(dev_out));
+        rth->rt_peer_genid = 0;
+        rth->peer = NULL;
+        rth->fi = NULL;
 
         RT_CACHE_STAT_INC(out_slow_tot);
 
@@ -2432,7 +2449,6 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
 
         rt_set_nexthop(rth, oldflp4, res, fi, type, 0);
 
-        rth->rt_flags = flags;
         return rth;
 }
 
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e8b2bb9060ef..f1be5c5c85ef 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -230,7 +230,11 @@ static struct rt6_info ip6_blk_hole_entry_template = {
 static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops,
                                              struct net_device *dev)
 {
-        return (struct rt6_info *)dst_alloc(ops, dev, 0, 0, 0);
+        struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, 0);
+
+        memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry));
+
+        return rt;
 }
 
 static void ip6_dst_destroy(struct dst_entry *dst)
@@ -887,6 +891,8 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
 
         rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0);
         if (rt) {
+                memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry));
+
                 new = &rt->dst;
 
                 new->__use = 1;
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 70552c4e2272..00bcb88386c2 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1349,6 +1349,7 @@ static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
                 BUG();
         }
         xdst = dst_alloc(dst_ops, NULL, 0, 0, 0);
+        memset(&xdst->u.rt6.rt6i_table, 0, sizeof(*xdst) - sizeof(struct dst_entry));
         xfrm_policy_put_afinfo(afinfo);
 
         if (likely(xdst))