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Commit 0c4dcd58 authored by David S. Miller's avatar David S. Miller
Browse files

ipv4: Consolidate ipv4 dst allocation logic. 



This also allows us to combine all the dst->flags settings and avoid
read/modify/write sequences to this struct member.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 010c2708

net/ipv4/route.c

+21 −31
Original line number Diff line number Diff line
@@ -1816,6 +1816,21 @@ static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) 
	rt->rt_type = res->type;

}



static struct rtable *rt_dst_alloc(bool nopolicy, bool noxfrm)

{

	struct rtable *rt = dst_alloc(&ipv4_dst_ops);

	if (rt) {

		rt->dst.obsolete = -1;



		atomic_set(&rt->dst.__refcnt, 1);



		rt->dst.flags = DST_HOST |

			(nopolicy ? DST_NOPOLICY : 0) |

			(noxfrm ? DST_NOXFRM : 0);

	}

	return rt;

}



/* called in rcu_read_lock() section */

static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,

				u8 tos, struct net_device *dev, int our)
@@ -1846,17 +1861,12 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, 
		if (err < 0)

			goto e_err;

	}

	rth = dst_alloc(&ipv4_dst_ops);

	rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), false);

	if (!rth)

		goto e_nobufs;



	rth->dst.output = ip_rt_bug;

	rth->dst.obsolete = -1;



	atomic_set(&rth->dst.__refcnt, 1);

	rth->dst.flags= DST_HOST;

	if (IN_DEV_CONF_GET(in_dev, NOPOLICY))

		rth->dst.flags |= DST_NOPOLICY;

	rth->fl.fl4_dst	= daddr;

	rth->rt_dst	= daddr;

	rth->fl.fl4_tos	= tos;
@@ -1985,19 +1995,13 @@ static int __mkroute_input(struct sk_buff *skb, 
		}

	}





	rth = dst_alloc(&ipv4_dst_ops);

	rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY),

			   IN_DEV_CONF_GET(out_dev, NOXFRM));

	if (!rth) {

		err = -ENOBUFS;

		goto cleanup;

	}



	atomic_set(&rth->dst.__refcnt, 1);

	rth->dst.flags= DST_HOST;

	if (IN_DEV_CONF_GET(in_dev, NOPOLICY))

		rth->dst.flags |= DST_NOPOLICY;

	if (IN_DEV_CONF_GET(out_dev, NOXFRM))

		rth->dst.flags |= DST_NOXFRM;

	rth->fl.fl4_dst	= daddr;

	rth->rt_dst	= daddr;

	rth->fl.fl4_tos	= tos;
@@ -2012,7 +2016,6 @@ static int __mkroute_input(struct sk_buff *skb, 
	rth->fl.oif 	= 0;

	rth->rt_spec_dst= spec_dst;



	rth->dst.obsolete = -1;

	rth->dst.input = ip_forward;

	rth->dst.output = ip_output;

	rth->rt_genid = rt_genid(dev_net(rth->dst.dev));
@@ -2162,18 +2165,13 @@ out: return err; 
	RT_CACHE_STAT_INC(in_brd);



local_input:

	rth = dst_alloc(&ipv4_dst_ops);

	rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), false);

	if (!rth)

		goto e_nobufs;



	rth->dst.output= ip_rt_bug;

	rth->dst.obsolete = -1;

	rth->rt_genid = rt_genid(net);



	atomic_set(&rth->dst.__refcnt, 1);

	rth->dst.flags= DST_HOST;

	if (IN_DEV_CONF_GET(in_dev, NOPOLICY))

		rth->dst.flags |= DST_NOPOLICY;

	rth->fl.fl4_dst	= daddr;

	rth->rt_dst	= daddr;

	rth->fl.fl4_tos	= tos;
@@ -2366,18 +2364,11 @@ static struct rtable *__mkroute_output(struct fib_result *res, 
			res->fi = NULL;

	}





	rth = dst_alloc(&ipv4_dst_ops);

	rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY),

			   IN_DEV_CONF_GET(in_dev, NOXFRM));

	if (!rth)

		return ERR_PTR(-ENOBUFS);



	atomic_set(&rth->dst.__refcnt, 1);

	rth->dst.flags= DST_HOST;

	if (IN_DEV_CONF_GET(in_dev, NOXFRM))

		rth->dst.flags |= DST_NOXFRM;

	if (IN_DEV_CONF_GET(in_dev, NOPOLICY))

		rth->dst.flags |= DST_NOPOLICY;



	rth->fl.fl4_dst	= oldflp->fl4_dst;

	rth->fl.fl4_tos	= tos;

	rth->fl.fl4_src	= oldflp->fl4_src;
@@ -2394,7 +2385,6 @@ static struct rtable *__mkroute_output(struct fib_result *res, 
	rth->rt_spec_dst= fl->fl4_src;



	rth->dst.output=ip_output;

	rth->dst.obsolete = -1;

	rth->rt_genid = rt_genid(dev_net(dev_out));



	RT_CACHE_STAT_INC(out_slow_tot);