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Commit cf911662 authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarDavid S. Miller <davem@davemloft.net>
parent 5c1e6aa3

net/core/dst.c

+17 −3
Original line number Diff line number Diff line
@@ -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

net/decnet/dn_route.c

+2 −0
Original line number Diff line number Diff line
@@ -1129,6 +1129,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *o 
	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 @@ static int dn_route_input_slow(struct sk_buff *skb) 
	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;

net/ipv4/route.c

+47 −31
Original line number Diff line number Diff line
@@ -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 @@ out: return err; 
	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;

}

net/ipv6/route.c

+7 −1
Original line number Diff line number Diff line
@@ -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;

net/xfrm/xfrm_policy.c

+1 −0
Original line number Diff line number Diff line
@@ -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))