1 files changed, 212 insertions, 1117 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index d547f6fae20d..9add08869c75 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -133,10 +133,6 @@ static int ip_rt_gc_elasticity __read_mostly	= 8;
 static int ip_rt_mtu_expires __read_mostly	= 10 * 60 * HZ;
 static int ip_rt_min_pmtu __read_mostly		= 512 + 20 + 20;
 static int ip_rt_min_advmss __read_mostly	= 256;
-static int rt_chain_length_max __read_mostly	= 20;
-
-static struct delayed_work expires_work;
-static unsigned long expires_ljiffies;
 
 /*
  *	Interface to generic destination cache.
@@ -145,14 +141,12 @@ static unsigned long expires_ljiffies;
 static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie);
 static unsigned int	 ipv4_default_advmss(const struct dst_entry *dst);
 static unsigned int	 ipv4_mtu(const struct dst_entry *dst);
-static void		 ipv4_dst_destroy(struct dst_entry *dst);
 static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst);
 static void		 ipv4_link_failure(struct sk_buff *skb);
 static void		 ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
 					   struct sk_buff *skb, u32 mtu);
 static void		 ip_do_redirect(struct dst_entry *dst, struct sock *sk,
 					struct sk_buff *skb);
-static int rt_garbage_collect(struct dst_ops *ops);
 
 static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 			    int how)
@@ -172,12 +166,10 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
 static struct dst_ops ipv4_dst_ops = {
 	.family =		AF_INET,
 	.protocol =		cpu_to_be16(ETH_P_IP),
-	.gc =			rt_garbage_collect,
 	.check =		ipv4_dst_check,
 	.default_advmss =	ipv4_default_advmss,
 	.mtu =			ipv4_mtu,
 	.cow_metrics =		ipv4_cow_metrics,
-	.destroy =		ipv4_dst_destroy,
 	.ifdown =		ipv4_dst_ifdown,
 	.negative_advice =	ipv4_negative_advice,
 	.link_failure =		ipv4_link_failure,
@@ -209,184 +201,30 @@ const __u8 ip_tos2prio[16] = {
 };
 EXPORT_SYMBOL(ip_tos2prio);
 
-/*
- * Route cache.
- */
-
-/* The locking scheme is rather straight forward:
- *
- * 1) Read-Copy Update protects the buckets of the central route hash.
- * 2) Only writers remove entries, and they hold the lock
- *    as they look at rtable reference counts.
- * 3) Only readers acquire references to rtable entries,
- *    they do so with atomic increments and with the
- *    lock held.
- */
-
-struct rt_hash_bucket {
-	struct rtable __rcu	*chain;
-};
-
-#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \
-	defined(CONFIG_PROVE_LOCKING)
-/*
- * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks
- * The size of this table is a power of two and depends on the number of CPUS.
- * (on lockdep we have a quite big spinlock_t, so keep the size down there)
- */
-#ifdef CONFIG_LOCKDEP
-# define RT_HASH_LOCK_SZ	256
-#else
-# if NR_CPUS >= 32
-#  define RT_HASH_LOCK_SZ	4096
-# elif NR_CPUS >= 16
-#  define RT_HASH_LOCK_SZ	2048
-# elif NR_CPUS >= 8
-#  define RT_HASH_LOCK_SZ	1024
-# elif NR_CPUS >= 4
-#  define RT_HASH_LOCK_SZ	512
-# else
-#  define RT_HASH_LOCK_SZ	256
-# endif
-#endif
-
-static spinlock_t	*rt_hash_locks;
-# define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)]
-
-static __init void rt_hash_lock_init(void)
-{
-	int i;
-
-	rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ,
-			GFP_KERNEL);
-	if (!rt_hash_locks)
-		panic("IP: failed to allocate rt_hash_locks\n");
-
-	for (i = 0; i < RT_HASH_LOCK_SZ; i++)
-		spin_lock_init(&rt_hash_locks[i]);
-}
-#else
-# define rt_hash_lock_addr(slot) NULL
-
-static inline void rt_hash_lock_init(void)
-{
-}
-#endif
-
-static struct rt_hash_bucket 	*rt_hash_table __read_mostly;
-static unsigned int		rt_hash_mask __read_mostly;
-static unsigned int		rt_hash_log  __read_mostly;
-
 static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
 #define RT_CACHE_STAT_INC(field) __this_cpu_inc(rt_cache_stat.field)
 
-static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx,
-				   int genid)
-{
-	return jhash_3words((__force u32)daddr, (__force u32)saddr,
-			    idx, genid)
-		& rt_hash_mask;
-}
-
 static inline int rt_genid(struct net *net)
 {
 	return atomic_read(&net->ipv4.rt_genid);
 }
 
 #ifdef CONFIG_PROC_FS
-struct rt_cache_iter_state {
-	struct seq_net_private p;
-	int bucket;
-	int genid;
-};
-
-static struct rtable *rt_cache_get_first(struct seq_file *seq)
-{
-	struct rt_cache_iter_state *st = seq->private;
-	struct rtable *r = NULL;
-
-	for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) {
-		if (!rcu_access_pointer(rt_hash_table[st->bucket].chain))
-			continue;
-		rcu_read_lock_bh();
-		r = rcu_dereference_bh(rt_hash_table[st->bucket].chain);
-		while (r) {
-			if (dev_net(r->dst.dev) == seq_file_net(seq) &&
-			    r->rt_genid == st->genid)
-				return r;
-			r = rcu_dereference_bh(r->dst.rt_next);
-		}
-		rcu_read_unlock_bh();
-	}
-	return r;
-}
-
-static struct rtable *__rt_cache_get_next(struct seq_file *seq,
-					  struct rtable *r)
-{
-	struct rt_cache_iter_state *st = seq->private;
-
-	r = rcu_dereference_bh(r->dst.rt_next);
-	while (!r) {
-		rcu_read_unlock_bh();
-		do {
-			if (--st->bucket < 0)
-				return NULL;
-		} while (!rcu_access_pointer(rt_hash_table[st->bucket].chain));
-		rcu_read_lock_bh();
-		r = rcu_dereference_bh(rt_hash_table[st->bucket].chain);
-	}
-	return r;
-}
-
-static struct rtable *rt_cache_get_next(struct seq_file *seq,
-					struct rtable *r)
-{
-	struct rt_cache_iter_state *st = seq->private;
-	while ((r = __rt_cache_get_next(seq, r)) != NULL) {
-		if (dev_net(r->dst.dev) != seq_file_net(seq))
-			continue;
-		if (r->rt_genid == st->genid)
-			break;
-	}
-	return r;
-}
-
-static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos)
-{
-	struct rtable *r = rt_cache_get_first(seq);
-
-	if (r)
-		while (pos && (r = rt_cache_get_next(seq, r)))
-			--pos;
-	return pos ? NULL : r;
-}
-
 static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
 {
-	struct rt_cache_iter_state *st = seq->private;
 	if (*pos)
-		return rt_cache_get_idx(seq, *pos - 1);
-	st->genid = rt_genid(seq_file_net(seq));
+		return NULL;
 	return SEQ_START_TOKEN;
 }
 
 static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
-	struct rtable *r;
-
-	if (v == SEQ_START_TOKEN)
-		r = rt_cache_get_first(seq);
-	else
-		r = rt_cache_get_next(seq, v);
 	++*pos;
-	return r;
+	return NULL;
 }
 
 static void rt_cache_seq_stop(struct seq_file *seq, void *v)
 {
-	if (v && v != SEQ_START_TOKEN)
-		rcu_read_unlock_bh();
 }
 
 static int rt_cache_seq_show(struct seq_file *seq, void *v)
@@ -396,24 +234,6 @@ static int rt_cache_seq_show(struct seq_file *seq, void *v)
 			   "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t"
 			   "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t"
 			   "HHUptod\tSpecDst");
-	else {
-		struct rtable *r = v;
-		int len;
-
-		seq_printf(seq, "%s\t%08X\t%08X\t%8X\t%d\t%u\t%d\t"
-			   "%08X\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n",
-			   r->dst.dev ? r->dst.dev->name : "*",
-			   (__force u32)r->rt_dst,
-			   (__force u32)r->rt_gateway,
-			   r->rt_flags, atomic_read(&r->dst.__refcnt),
-			   r->dst.__use, 0, (__force u32)r->rt_src,
-			   dst_metric_advmss(&r->dst) + 40,
-			   dst_metric(&r->dst, RTAX_WINDOW), 0,
-			   r->rt_key_tos,
-			   -1, 0, 0, &len);
-
-		seq_printf(seq, "%*s\n", 127 - len, "");
-	}
 	return 0;
 }
 
@@ -426,8 +246,7 @@ static const struct seq_operations rt_cache_seq_ops = {
 
 static int rt_cache_seq_open(struct inode *inode, struct file *file)
 {
-	return seq_open_net(inode, file, &rt_cache_seq_ops,
-			sizeof(struct rt_cache_iter_state));
+	return seq_open(file, &rt_cache_seq_ops);
 }
 
 static const struct file_operations rt_cache_seq_fops = {
@@ -435,7 +254,7 @@ static const struct file_operations rt_cache_seq_fops = {
 	.open	 = rt_cache_seq_open,
 	.read	 = seq_read,
 	.llseek	 = seq_lseek,
-	.release = seq_release_net,
+	.release = seq_release,
 };
 
 
@@ -625,263 +444,12 @@ static inline int ip_rt_proc_init(void)
 }
 #endif /* CONFIG_PROC_FS */
 
-static inline void rt_free(struct rtable *rt)
-{
-	call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);
-}
-
-static inline void rt_drop(struct rtable *rt)
-{
-	ip_rt_put(rt);
-	call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);
-}
-
-static inline int rt_fast_clean(struct rtable *rth)
-{
-	/* Kill broadcast/multicast entries very aggresively, if they
-	   collide in hash table with more useful entries */
-	return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) &&
-		rt_is_input_route(rth) && rth->dst.rt_next;
-}
-
-static inline int rt_valuable(struct rtable *rth)
-{
-	return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) ||
-		rth->dst.expires;
-}
-
-static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2)
-{
-	unsigned long age;
-	int ret = 0;
-
-	if (atomic_read(&rth->dst.__refcnt))
-		goto out;
-
-	age = jiffies - rth->dst.lastuse;
-	if ((age <= tmo1 && !rt_fast_clean(rth)) ||
-	    (age <= tmo2 && rt_valuable(rth)))
-		goto out;
-	ret = 1;
-out:	return ret;
-}
-
-/* Bits of score are:
- * 31: very valuable
- * 30: not quite useless
- * 29..0: usage counter
- */
-static inline u32 rt_score(struct rtable *rt)
-{
-	u32 score = jiffies - rt->dst.lastuse;
-
-	score = ~score & ~(3<<30);
-
-	if (rt_valuable(rt))
-		score |= (1<<31);
-
-	if (rt_is_output_route(rt) ||
-	    !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL)))
-		score |= (1<<30);
-
-	return score;
-}
-
-static inline bool rt_caching(const struct net *net)
-{
-	return net->ipv4.current_rt_cache_rebuild_count <=
-		net->ipv4.sysctl_rt_cache_rebuild_count;
-}
-
-static inline bool compare_hash_inputs(const struct rtable *rt1,
-				       const struct rtable *rt2)
-{
-	return ((((__force u32)rt1->rt_key_dst ^ (__force u32)rt2->rt_key_dst) |
-		((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) |
-		(rt1->rt_route_iif ^ rt2->rt_route_iif)) == 0);
-}
-
-static inline int compare_keys(struct rtable *rt1, struct rtable *rt2)
-{
-	return (((__force u32)rt1->rt_key_dst ^ (__force u32)rt2->rt_key_dst) |
-		((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) |
-		(rt1->rt_mark ^ rt2->rt_mark) |
-		(rt1->rt_key_tos ^ rt2->rt_key_tos) |
-		(rt1->rt_route_iif ^ rt2->rt_route_iif) |
-		(rt1->rt_oif ^ rt2->rt_oif)) == 0;
-}
-
-static inline int compare_netns(struct rtable *rt1, struct rtable *rt2)
-{
-	return net_eq(dev_net(rt1->dst.dev), dev_net(rt2->dst.dev));
-}
-
 static inline int rt_is_expired(struct rtable *rth)
 {
 	return rth->rt_genid != rt_genid(dev_net(rth->dst.dev));
 }
 
 /*
- * Perform a full scan of hash table and free all entries.
- * Can be called by a softirq or a process.
- * In the later case, we want to be reschedule if necessary
- */
-static void rt_do_flush(struct net *net, int process_context)
-{
-	unsigned int i;
-	struct rtable *rth, *next;
-
-	for (i = 0; i <= rt_hash_mask; i++) {
-		struct rtable __rcu **pprev;
-		struct rtable *list;
-
-		if (process_context && need_resched())
-			cond_resched();
-		rth = rcu_access_pointer(rt_hash_table[i].chain);
-		if (!rth)
-			continue;
-
-		spin_lock_bh(rt_hash_lock_addr(i));
-
-		list = NULL;
-		pprev = &rt_hash_table[i].chain;
-		rth = rcu_dereference_protected(*pprev,
-			lockdep_is_held(rt_hash_lock_addr(i)));
-
-		while (rth) {
-			next = rcu_dereference_protected(rth->dst.rt_next,
-				lockdep_is_held(rt_hash_lock_addr(i)));
-
-			if (!net ||
-			    net_eq(dev_net(rth->dst.dev), net)) {
-				rcu_assign_pointer(*pprev, next);
-				rcu_assign_pointer(rth->dst.rt_next, list);
-				list = rth;
-			} else {
-				pprev = &rth->dst.rt_next;
-			}
-			rth = next;
-		}
-
-		spin_unlock_bh(rt_hash_lock_addr(i));
-
-		for (; list; list = next) {
-			next = rcu_dereference_protected(list->dst.rt_next, 1);
-			rt_free(list);
-		}
-	}
-}
-
-/*
- * While freeing expired entries, we compute average chain length
- * and standard deviation, using fixed-point arithmetic.
- * This to have an estimation of rt_chain_length_max
- *  rt_chain_length_max = max(elasticity, AVG + 4*SD)
- * We use 3 bits for frational part, and 29 (or 61) for magnitude.
- */
-
-#define FRACT_BITS 3
-#define ONE (1UL << FRACT_BITS)
-
-/*
- * Given a hash chain and an item in this hash chain,
- * find if a previous entry has the same hash_inputs
- * (but differs on tos, mark or oif)
- * Returns 0 if an alias is found.
- * Returns ONE if rth has no alias before itself.
- */
-static int has_noalias(const struct rtable *head, const struct rtable *rth)
-{
-	const struct rtable *aux = head;
-
-	while (aux != rth) {
-		if (compare_hash_inputs(aux, rth))
-			return 0;
-		aux = rcu_dereference_protected(aux->dst.rt_next, 1);
-	}
-	return ONE;
-}
-
-static void rt_check_expire(void)
-{
-	static unsigned int rover;
-	unsigned int i = rover, goal;
-	struct rtable *rth;
-	struct rtable __rcu **rthp;
-	unsigned long samples = 0;
-	unsigned long sum = 0, sum2 = 0;
-	unsigned long delta;
-	u64 mult;
-
-	delta = jiffies - expires_ljiffies;
-	expires_ljiffies = jiffies;
-	mult = ((u64)delta) << rt_hash_log;
-	if (ip_rt_gc_timeout > 1)
-		do_div(mult, ip_rt_gc_timeout);
-	goal = (unsigned int)mult;
-	if (goal > rt_hash_mask)
-		goal = rt_hash_mask + 1;
-	for (; goal > 0; goal--) {
-		unsigned long tmo = ip_rt_gc_timeout;
-		unsigned long length;
-
-		i = (i + 1) & rt_hash_mask;
-		rthp = &rt_hash_table[i].chain;
-
-		if (need_resched())
-			cond_resched();
-
-		samples++;
-
-		if (rcu_dereference_raw(*rthp) == NULL)
-			continue;
-		length = 0;
-		spin_lock_bh(rt_hash_lock_addr(i));
-		while ((rth = rcu_dereference_protected(*rthp,
-					lockdep_is_held(rt_hash_lock_addr(i)))) != NULL) {
-			prefetch(rth->dst.rt_next);
-			if (rt_is_expired(rth) ||
-			    rt_may_expire(rth, tmo, ip_rt_gc_timeout)) {
-				*rthp = rth->dst.rt_next;
-				rt_free(rth);
-				continue;
-			}
-
-			/* We only count entries on a chain with equal
-			 * hash inputs once so that entries for
-			 * different QOS levels, and other non-hash
-			 * input attributes don't unfairly skew the
-			 * length computation
-			 */
-			tmo >>= 1;
-			rthp = &rth->dst.rt_next;
-			length += has_noalias(rt_hash_table[i].chain, rth);
-		}
-		spin_unlock_bh(rt_hash_lock_addr(i));
-		sum += length;
-		sum2 += length*length;
-	}
-	if (samples) {
-		unsigned long avg = sum / samples;
-		unsigned long sd = int_sqrt(sum2 / samples - avg*avg);
-		rt_chain_length_max = max_t(unsigned long,
-					ip_rt_gc_elasticity,
-					(avg + 4*sd) >> FRACT_BITS);
-	}
-	rover = i;
-}
-
-/*
- * rt_worker_func() is run in process context.
- * we call rt_check_expire() to scan part of the hash table
- */
-static void rt_worker_func(struct work_struct *work)
-{
-	rt_check_expire();
-	schedule_delayed_work(&expires_work, ip_rt_gc_interval);
-}
-
-/*
  * Perturbation of rt_genid by a small quantity [1..256]
  * Using 8 bits of shuffling ensure we can call rt_cache_invalidate()
  * many times (2^24) without giving recent rt_genid.
@@ -902,167 +470,6 @@ static void rt_cache_invalidate(struct net *net)
 void rt_cache_flush(struct net *net, int delay)
 {
 	rt_cache_invalidate(net);
-	if (delay >= 0)
-		rt_do_flush(net, !in_softirq());
-}
-
-/* Flush previous cache invalidated entries from the cache */
-void rt_cache_flush_batch(struct net *net)
-{
-	rt_do_flush(net, !in_softirq());
-}
-
-static void rt_emergency_hash_rebuild(struct net *net)
-{
-	net_warn_ratelimited("Route hash chain too long!\n");
-	rt_cache_invalidate(net);
-}
-
-/*
-   Short description of GC goals.
-
-   We want to build algorithm, which will keep routing cache
-   at some equilibrium point, when number of aged off entries
-   is kept approximately equal to newly generated ones.
-
-   Current expiration strength is variable "expire".
-   We try to adjust it dynamically, so that if networking
-   is idle expires is large enough to keep enough of warm entries,
-   and when load increases it reduces to limit cache size.
- */
-
-static int rt_garbage_collect(struct dst_ops *ops)
-{
-	static unsigned long expire = RT_GC_TIMEOUT;
-	static unsigned long last_gc;
-	static int rover;
-	static int equilibrium;
-	struct rtable *rth;
-	struct rtable __rcu **rthp;
-	unsigned long now = jiffies;
-	int goal;
-	int entries = dst_entries_get_fast(&ipv4_dst_ops);
-
-	/*
-	 * Garbage collection is pretty expensive,
-	 * do not make it too frequently.
-	 */
-
-	RT_CACHE_STAT_INC(gc_total);
-
-	if (now - last_gc < ip_rt_gc_min_interval &&
-	    entries < ip_rt_max_size) {
-		RT_CACHE_STAT_INC(gc_ignored);
-		goto out;
-	}
-
-	entries = dst_entries_get_slow(&ipv4_dst_ops);
-	/* Calculate number of entries, which we want to expire now. */
-	goal = entries - (ip_rt_gc_elasticity << rt_hash_log);
-	if (goal <= 0) {
-		if (equilibrium < ipv4_dst_ops.gc_thresh)
-			equilibrium = ipv4_dst_ops.gc_thresh;
-		goal = entries - equilibrium;
-		if (goal > 0) {
-			equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1);
-			goal = entries - equilibrium;
-		}
-	} else {
-		/* We are in dangerous area. Try to reduce cache really
-		 * aggressively.
-		 */
-		goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1);
-		equilibrium = entries - goal;
-	}
-
-	if (now - last_gc >= ip_rt_gc_min_interval)
-		last_gc = now;
-
-	if (goal <= 0) {
-		equilibrium += goal;
-		goto work_done;
-	}
-
-	do {
-		int i, k;
-
-		for (i = rt_hash_mask, k = rover; i >= 0; i--) {
-			unsigned long tmo = expire;
-
-			k = (k + 1) & rt_hash_mask;
-			rthp = &rt_hash_table[k].chain;
-			spin_lock_bh(rt_hash_lock_addr(k));
-			while ((rth = rcu_dereference_protected(*rthp,
-					lockdep_is_held(rt_hash_lock_addr(k)))) != NULL) {
-				if (!rt_is_expired(rth) &&
-					!rt_may_expire(rth, tmo, expire)) {
-					tmo >>= 1;
-					rthp = &rth->dst.rt_next;
-					continue;
-				}
-				*rthp = rth->dst.rt_next;
-				rt_free(rth);
-				goal--;
-			}
-			spin_unlock_bh(rt_hash_lock_addr(k));
-			if (goal <= 0)
-				break;
-		}
-		rover = k;
-
-		if (goal <= 0)
-			goto work_done;
-
-		/* Goal is not achieved. We stop process if:
-
-		   - if expire reduced to zero. Otherwise, expire is halfed.
-		   - if table is not full.
-		   - if we are called from interrupt.
-		   - jiffies check is just fallback/debug loop breaker.
-		     We will not spin here for long time in any case.
-		 */
-
-		RT_CACHE_STAT_INC(gc_goal_miss);
-
-		if (expire == 0)
-			break;
-
-		expire >>= 1;
-
-		if (dst_entries_get_fast(&ipv4_dst_ops) < ip_rt_max_size)
-			goto out;
-	} while (!in_softirq() && time_before_eq(jiffies, now));
-
-	if (dst_entries_get_fast(&ipv4_dst_ops) < ip_rt_max_size)
-		goto out;
-	if (dst_entries_get_slow(&ipv4_dst_ops) < ip_rt_max_size)
-		goto out;
-	net_warn_ratelimited("dst cache overflow\n");
-	RT_CACHE_STAT_INC(gc_dst_overflow);
-	return 1;
-
-work_done:
-	expire += ip_rt_gc_min_interval;
-	if (expire > ip_rt_gc_timeout ||
-	    dst_entries_get_fast(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh ||
-	    dst_entries_get_slow(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh)
-		expire = ip_rt_gc_timeout;
-out:	return 0;
-}
-
-/*
- * Returns number of entries in a hash chain that have different hash_inputs
- */
-static int slow_chain_length(const struct rtable *head)
-{
-	int length = 0;
-	const struct rtable *rth = head;
-
-	while (rth) {
-		length += has_noalias(head, rth);
-		rth = rcu_dereference_protected(rth->dst.rt_next, 1);
-	}
-	return length >> FRACT_BITS;
 }
 
 static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
@@ -1086,139 +493,6 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
 	return neigh_create(&arp_tbl, pkey, dev);
 }
 
-static struct rtable *rt_intern_hash(unsigned int hash, struct rtable *rt,
-				     struct sk_buff *skb, int ifindex)
-{
-	struct rtable	*rth, *cand;
-	struct rtable __rcu **rthp, **candp;
-	unsigned long	now;
-	u32 		min_score;
-	int		chain_length;
-
-restart:
-	chain_length = 0;
-	min_score = ~(u32)0;
-	cand = NULL;
-	candp = NULL;
-	now = jiffies;
-
-	if (!rt_caching(dev_net(rt->dst.dev)) || (rt->dst.flags & DST_NOCACHE)) {
-		/*
-		 * If we're not caching, just tell the caller we
-		 * were successful and don't touch the route.  The
-		 * caller hold the sole reference to the cache entry, and
-		 * it will be released when the caller is done with it.
-		 * If we drop it here, the callers have no way to resolve routes
-		 * when we're not caching.  Instead, just point *rp at rt, so
-		 * the caller gets a single use out of the route
-		 * Note that we do rt_free on this new route entry, so that
-		 * once its refcount hits zero, we are still able to reap it
-		 * (Thanks Alexey)
-		 * Note: To avoid expensive rcu stuff for this uncached dst,
-		 * we set DST_NOCACHE so that dst_release() can free dst without
-		 * waiting a grace period.
-		 */
-
-		rt->dst.flags |= DST_NOCACHE;
-		goto skip_hashing;
-	}
-
-	rthp = &rt_hash_table[hash].chain;
-
-	spin_lock_bh(rt_hash_lock_addr(hash));
-	while ((rth = rcu_dereference_protected(*rthp,
-			lockdep_is_held(rt_hash_lock_addr(hash)))) != NULL) {
-		if (rt_is_expired(rth)) {
-			*rthp = rth->dst.rt_next;
-			rt_free(rth);
-			continue;
-		}
-		if (compare_keys(rth, rt) && compare_netns(rth, rt)) {
-			/* Put it first */
-			*rthp = rth->dst.rt_next;
-			/*
-			 * Since lookup is lockfree, the deletion
-			 * must be visible to another weakly ordered CPU before
-			 * the insertion at the start of the hash chain.
-			 */
-			rcu_assign_pointer(rth->dst.rt_next,
-					   rt_hash_table[hash].chain);
-			/*
-			 * Since lookup is lockfree, the update writes
-			 * must be ordered for consistency on SMP.
-			 */
-			rcu_assign_pointer(rt_hash_table[hash].chain, rth);
-
-			dst_use(&rth->dst, now);
-			spin_unlock_bh(rt_hash_lock_addr(hash));
-
-			rt_drop(rt);
-			if (skb)
-				skb_dst_set(skb, &rth->dst);
-			return rth;
-		}
-
-		if (!atomic_read(&rth->dst.__refcnt)) {
-			u32 score = rt_score(rth);
-
-			if (score <= min_score) {
-				cand = rth;
-				candp = rthp;
-				min_score = score;
-			}
-		}
-
-		chain_length++;
-
-		rthp = &rth->dst.rt_next;
-	}
-
-	if (cand) {
-		/* ip_rt_gc_elasticity used to be average length of chain
-		 * length, when exceeded gc becomes really aggressive.
-		 *
-		 * The second limit is less certain. At the moment it allows
-		 * only 2 entries per bucket. We will see.
-		 */
-		if (chain_length > ip_rt_gc_elasticity) {
-			*candp = cand->dst.rt_next;
-			rt_free(cand);
-		}
-	} else {
-		if (chain_length > rt_chain_length_max &&
-		    slow_chain_length(rt_hash_table[hash].chain) > rt_chain_length_max) {
-			struct net *net = dev_net(rt->dst.dev);
-			int num = ++net->ipv4.current_rt_cache_rebuild_count;
-			if (!rt_caching(net)) {
-				pr_warn("%s: %d rebuilds is over limit, route caching disabled\n",
-					rt->dst.dev->name, num);
-			}
-			rt_emergency_hash_rebuild(net);
-			spin_unlock_bh(rt_hash_lock_addr(hash));
-
-			hash = rt_hash(rt->rt_key_dst, rt->rt_key_src,
-					ifindex, rt_genid(net));
-			goto restart;
-		}
-	}
-
-	rt->dst.rt_next = rt_hash_table[hash].chain;
-
-	/*
-	 * Since lookup is lockfree, we must make sure
-	 * previous writes to rt are committed to memory
-	 * before making rt visible to other CPUS.
-	 */
-	rcu_assign_pointer(rt_hash_table[hash].chain, rt);
-
-	spin_unlock_bh(rt_hash_lock_addr(hash));
-
-skip_hashing:
-	if (skb)
-		skb_dst_set(skb, &rt->dst);
-	return rt;
-}
-
 /*
  * Peer allocation may fail only in serious out-of-memory conditions.  However
  * we still can generate some output.
@@ -1255,26 +529,6 @@ void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more)
 }
 EXPORT_SYMBOL(__ip_select_ident);
 
-static void rt_del(unsigned int hash, struct rtable *rt)
-{
-	struct rtable __rcu **rthp;
-	struct rtable *aux;
-
-	rthp = &rt_hash_table[hash].chain;
-	spin_lock_bh(rt_hash_lock_addr(hash));
-	ip_rt_put(rt);
-	while ((aux = rcu_dereference_protected(*rthp,
-			lockdep_is_held(rt_hash_lock_addr(hash)))) != NULL) {
-		if (aux == rt || rt_is_expired(aux)) {
-			*rthp = aux->dst.rt_next;
-			rt_free(aux);
-			continue;
-		}
-		rthp = &aux->dst.rt_next;
-	}
-	spin_unlock_bh(rt_hash_lock_addr(hash));
-}
-
 static void __build_flow_key(struct flowi4 *fl4, const struct sock *sk,
 			     const struct iphdr *iph,
 			     int oif, u8 tos,
@@ -1417,7 +671,8 @@ out_unlock:
 	return;
 }
 
-static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4)
+static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4,
+			     bool kill_route)
 {
 	__be32 new_gw = icmp_hdr(skb)->un.gateway;
 	__be32 old_gw = ip_hdr(skb)->saddr;
@@ -1472,8 +727,8 @@ static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flow
 				update_or_create_fnhe(nh, fl4->daddr, new_gw,
 						      0, 0);
 			}
-			rt->rt_gateway = new_gw;
-			rt->rt_flags |= RTCF_REDIRECTED;
+			if (kill_route)
+				rt->dst.obsolete = DST_OBSOLETE_KILL;
 			call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n);
 		}
 		neigh_release(n);
@@ -1504,7 +759,7 @@ static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buf
 	rt = (struct rtable *) dst;
 
 	ip_rt_build_flow_key(&fl4, sk, skb);
-	__ip_do_redirect(rt, skb, &fl4);
+	__ip_do_redirect(rt, skb, &fl4, true);
 }
 
 static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
@@ -1518,10 +773,7 @@ static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
 			ret = NULL;
 		} else if ((rt->rt_flags & RTCF_REDIRECTED) ||
 			   rt->dst.expires) {
-			unsigned int hash = rt_hash(rt->rt_key_dst, rt->rt_key_src,
-						rt->rt_oif,
-						rt_genid(dev_net(dst->dev)));
-			rt_del(hash, rt);
+			ip_rt_put(rt);
 			ret = NULL;
 		}
 	}
@@ -1597,7 +849,7 @@ void ip_rt_send_redirect(struct sk_buff *skb)
 		    peer->rate_tokens == ip_rt_redirect_number)
 			net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n",
 					     &ip_hdr(skb)->saddr, rt->rt_iif,
-					     &rt->rt_dst, &rt->rt_gateway);
+					     &ip_hdr(skb)->daddr, &rt->rt_gateway);
 #endif
 	}
 out_put_peer:
@@ -1666,7 +918,7 @@ out:	kfree_skb(skb);
 	return 0;
 }
 
-static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
+static u32 __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
 {
 	struct fib_result res;
 
@@ -1679,8 +931,7 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
 		update_or_create_fnhe(nh, fl4->daddr, 0, mtu,
 				      jiffies + ip_rt_mtu_expires);
 	}
-	rt->rt_pmtu = mtu;
-	dst_set_expires(&rt->dst, ip_rt_mtu_expires);
+	return mtu;
 }
 
 static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
@@ -1690,7 +941,14 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
 	struct flowi4 fl4;
 
 	ip_rt_build_flow_key(&fl4, sk, skb);
-	__ip_rt_update_pmtu(rt, &fl4, mtu);
+	mtu = __ip_rt_update_pmtu(rt, &fl4, mtu);
+
+	if (!rt->rt_pmtu) {
+		dst->obsolete = DST_OBSOLETE_KILL;
+	} else {
+		rt->rt_pmtu = mtu;
+		dst_set_expires(&rt->dst, ip_rt_mtu_expires);
+	}
 }
 
 void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu,
@@ -1736,7 +994,7 @@ void ipv4_redirect(struct sk_buff *skb, struct net *net,
 			 RT_TOS(iph->tos), protocol, mark, flow_flags);
 	rt = __ip_route_output_key(net, &fl4);
 	if (!IS_ERR(rt)) {
-		__ip_do_redirect(rt, skb, &fl4);
+		__ip_do_redirect(rt, skb, &fl4, false);
 		ip_rt_put(rt);
 	}
 }
@@ -1751,7 +1009,7 @@ void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk)
 	__build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0);
 	rt = __ip_route_output_key(sock_net(sk), &fl4);
 	if (!IS_ERR(rt)) {
-		__ip_do_redirect(rt, skb, &fl4);
+		__ip_do_redirect(rt, skb, &fl4, false);
 		ip_rt_put(rt);
 	}
 }
@@ -1761,22 +1019,19 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
 {
 	struct rtable *rt = (struct rtable *) dst;
 
-	if (rt_is_expired(rt))
+	/* All IPV4 dsts are created with ->obsolete set to the value
+	 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
+	 * into this function always.
+	 *
+	 * When a PMTU/redirect information update invalidates a
+	 * route, this is indicated by setting obsolete to
+	 * DST_OBSOLETE_KILL.
+	 */
+	if (dst->obsolete == DST_OBSOLETE_KILL || rt_is_expired(rt))
 		return NULL;
 	return dst;
 }
 
-static void ipv4_dst_destroy(struct dst_entry *dst)
-{
-	struct rtable *rt = (struct rtable *) dst;
-
-	if (rt->fi) {
-		fib_info_put(rt->fi);
-		rt->fi = NULL;
-	}
-}
-
-
 static void ipv4_link_failure(struct sk_buff *skb)
 {
 	struct rtable *rt;
@@ -1832,8 +1087,9 @@ void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt)
 		if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0)
 			src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res);
 		else
-			src = inet_select_addr(rt->dst.dev, rt->rt_gateway,
-					RT_SCOPE_UNIVERSE);
+			src = inet_select_addr(rt->dst.dev,
+					       rt_nexthop(rt, iph->daddr),
+					       RT_SCOPE_UNIVERSE);
 		rcu_read_unlock();
 	}
 	memcpy(addr, &src, 4);
@@ -1879,8 +1135,7 @@ static unsigned int ipv4_mtu(const struct dst_entry *dst)
 	mtu = dst->dev->mtu;
 
 	if (unlikely(dst_metric_locked(dst, RTAX_MTU))) {
-
-		if (rt->rt_gateway != rt->rt_dst && mtu > 576)
+		if (rt->rt_gateway && mtu > 576)
 			mtu = 576;
 	}
 
@@ -1890,58 +1145,91 @@ static unsigned int ipv4_mtu(const struct dst_entry *dst)
 	return mtu;
 }
 
-static void rt_init_metrics(struct rtable *rt, const struct flowi4 *fl4,
-			    struct fib_info *fi)
-{
-	if (fi->fib_metrics != (u32 *) dst_default_metrics) {
-		rt->fi = fi;
-		atomic_inc(&fi->fib_clntref);
-	}
-	dst_init_metrics(&rt->dst, fi->fib_metrics, true);
-}
-
-static void rt_bind_exception(struct rtable *rt, struct fib_nh *nh, __be32 daddr)
+static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr)
 {
 	struct fnhe_hash_bucket *hash = nh->nh_exceptions;
 	struct fib_nh_exception *fnhe;
 	u32 hval;
 
+	if (!hash)
+		return NULL;
+
 	hval = fnhe_hashfun(daddr);
 
-restart:
 	for (fnhe = rcu_dereference(hash[hval].chain); fnhe;
 	     fnhe = rcu_dereference(fnhe->fnhe_next)) {
-		__be32 fnhe_daddr, gw;
-		unsigned long expires;
-		unsigned int seq;
-		u32 pmtu;
-
-		seq = read_seqbegin(&fnhe_seqlock);
-		fnhe_daddr = fnhe->fnhe_daddr;
-		gw = fnhe->fnhe_gw;
-		pmtu = fnhe->fnhe_pmtu;
-		expires = fnhe->fnhe_expires;
-		if (read_seqretry(&fnhe_seqlock, seq))
-			goto restart;
-		if (daddr != fnhe_daddr)
-			continue;
-		if (pmtu) {
-			unsigned long diff = expires - jiffies;
+		if (fnhe->fnhe_daddr == daddr)
+			return fnhe;
+	}
+	return NULL;
+}
 
-			if (time_before(jiffies, expires)) {
-				rt->rt_pmtu = pmtu;
-				dst_set_expires(&rt->dst, diff);
-			}
+static void rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe,
+			      __be32 daddr)
+{
+	__be32 fnhe_daddr, gw;
+	unsigned long expires;
+	unsigned int seq;
+	u32 pmtu;
+
+restart:
+	seq = read_seqbegin(&fnhe_seqlock);
+	fnhe_daddr = fnhe->fnhe_daddr;
+	gw = fnhe->fnhe_gw;
+	pmtu = fnhe->fnhe_pmtu;
+	expires = fnhe->fnhe_expires;
+	if (read_seqretry(&fnhe_seqlock, seq))
+		goto restart;
+
+	if (daddr != fnhe_daddr)
+		return;
+
+	if (pmtu) {
+		unsigned long diff = expires - jiffies;
+
+		if (time_before(jiffies, expires)) {
+			rt->rt_pmtu = pmtu;
+			dst_set_expires(&rt->dst, diff);
 		}
-		if (gw)
-			rt->rt_gateway = gw;
-		fnhe->fnhe_stamp = jiffies;
-		break;
 	}
+	if (gw) {
+		rt->rt_flags |= RTCF_REDIRECTED;
+		rt->rt_gateway = gw;
+	}
+	fnhe->fnhe_stamp = jiffies;
 }
 
-static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *fl4,
+static inline void rt_release_rcu(struct rcu_head *head)
+{
+	struct dst_entry *dst = container_of(head, struct dst_entry, rcu_head);
+	dst_release(dst);
+}
+
+static void rt_cache_route(struct fib_nh *nh, struct rtable *rt)
+{
+	struct rtable *orig, *prev, **p = &nh->nh_rth_output;
+
+	if (rt_is_input_route(rt))
+		p = &nh->nh_rth_input;
+
+	orig = *p;
+
+	prev = cmpxchg(p, orig, rt);
+	if (prev == orig) {
+		dst_clone(&rt->dst);
+		if (orig)
+			call_rcu_bh(&orig->dst.rcu_head, rt_release_rcu);
+	}
+}
+
+static bool rt_cache_valid(struct rtable *rt)
+{
+	return (rt && rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK);
+}
+
+static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
 			   const struct fib_result *res,
+			   struct fib_nh_exception *fnhe,
 			   struct fib_info *fi, u16 type, u32 itag)
 {
 	if (fi) {
@@ -1949,12 +1237,14 @@ static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *fl4,
 
 		if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK)
 			rt->rt_gateway = nh->nh_gw;
-		if (unlikely(nh->nh_exceptions))
-			rt_bind_exception(rt, nh, fl4->daddr);
-		rt_init_metrics(rt, fl4, fi);
+		if (unlikely(fnhe))
+			rt_bind_exception(rt, fnhe, daddr);
+		dst_init_metrics(&rt->dst, fi->fib_metrics, true);
 #ifdef CONFIG_IP_ROUTE_CLASSID
-		rt->dst.tclassid = FIB_RES_NH(*res).nh_tclassid;
+		rt->dst.tclassid = nh->nh_tclassid;
 #endif
+		if (!(rt->dst.flags & DST_HOST))
+			rt_cache_route(nh, rt);
 	}
 
 #ifdef CONFIG_IP_ROUTE_CLASSID
@@ -1966,10 +1256,10 @@ static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *fl4,
 }
 
 static struct rtable *rt_dst_alloc(struct net_device *dev,
-				   bool nopolicy, bool noxfrm)
+				   bool nopolicy, bool noxfrm, bool will_cache)
 {
-	return dst_alloc(&ipv4_dst_ops, dev, 1, -1,
-			 DST_HOST |
+	return dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK,
+			 (will_cache ? 0 : DST_HOST) | DST_NOCACHE |
 			 (nopolicy ? DST_NOPOLICY : 0) |
 			 (noxfrm ? DST_NOXFRM : 0));
 }
@@ -1978,7 +1268,6 @@ static struct rtable *rt_dst_alloc(struct net_device *dev,
 static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 				u8 tos, struct net_device *dev, int our)
 {
-	unsigned int hash;
 	struct rtable *rth;
 	struct in_device *in_dev = __in_dev_get_rcu(dev);
 	u32 itag = 0;
@@ -2007,7 +1296,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 			goto e_err;
 	}
 	rth = rt_dst_alloc(dev_net(dev)->loopback_dev,
-			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false);
+			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false);
 	if (!rth)
 		goto e_nobufs;
 
@@ -2016,21 +1305,13 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 #endif
 	rth->dst.output = ip_rt_bug;
 
-	rth->rt_key_dst	= daddr;
-	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_key_tos	= tos;
-	rth->rt_dst	= daddr;
-	rth->rt_src	= saddr;
-	rth->rt_route_iif = dev->ifindex;
+	rth->rt_is_input= 1;
 	rth->rt_iif	= dev->ifindex;
-	rth->rt_oif	= 0;
-	rth->rt_mark    = skb->mark;
 	rth->rt_pmtu	= 0;
-	rth->rt_gateway	= daddr;
-	rth->fi = NULL;
+	rth->rt_gateway	= 0;
 	if (our) {
 		rth->dst.input= ip_local_deliver;
 		rth->rt_flags |= RTCF_LOCAL;
@@ -2042,9 +1323,8 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 #endif
 	RT_CACHE_STAT_INC(in_slow_mc);
 
-	hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev)));
-	rth = rt_intern_hash(hash, rth, skb, dev->ifindex);
-	return IS_ERR(rth) ? PTR_ERR(rth) : 0;
+	skb_dst_set(skb, &rth->dst);
+	return 0;
 
 e_nobufs:
 	return -ENOBUFS;
@@ -2091,6 +1371,7 @@ static int __mkroute_input(struct sk_buff *skb,
 	int err;
 	struct in_device *out_dev;
 	unsigned int flags = 0;
+	bool do_cache;
 	u32 itag;
 
 	/* get a working reference to the output device */
@@ -2133,35 +1414,39 @@ static int __mkroute_input(struct sk_buff *skb,
 		}
 	}
 
+	do_cache = false;
+	if (res->fi) {
+		if (!(flags & RTCF_DIRECTSRC) && !itag) {
+			rth = FIB_RES_NH(*res).nh_rth_input;
+			if (rt_cache_valid(rth)) {
+				dst_hold(&rth->dst);
+				goto out;
+			}
+			do_cache = true;
+		}
+	}
+
 	rth = rt_dst_alloc(out_dev->dev,
 			   IN_DEV_CONF_GET(in_dev, NOPOLICY),
-			   IN_DEV_CONF_GET(out_dev, NOXFRM));
+			   IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache);
 	if (!rth) {
 		err = -ENOBUFS;
 		goto cleanup;
 	}
 
-	rth->rt_key_dst	= daddr;
-	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_key_tos	= tos;
-	rth->rt_dst	= daddr;
-	rth->rt_src	= saddr;
-	rth->rt_route_iif = in_dev->dev->ifindex;
+	rth->rt_is_input = 1;
 	rth->rt_iif 	= in_dev->dev->ifindex;
-	rth->rt_oif 	= 0;
-	rth->rt_mark    = skb->mark;
 	rth->rt_pmtu	= 0;
-	rth->rt_gateway	= daddr;
-	rth->fi = NULL;
+	rth->rt_gateway	= 0;
 
 	rth->dst.input = ip_forward;
 	rth->dst.output = ip_output;
 
-	rt_set_nexthop(rth, NULL, res, res->fi, res->type, itag);
-
+	rt_set_nexthop(rth, daddr, res, NULL, res->fi, res->type, itag);
+out:
 	*result = rth;
 	err = 0;
  cleanup:
@@ -2176,7 +1461,6 @@ static int ip_mkroute_input(struct sk_buff *skb,
 {
 	struct rtable *rth = NULL;
 	int err;
-	unsigned int hash;
 
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 	if (res->fi && res->fi->fib_nhs > 1)
@@ -2188,12 +1472,7 @@ static int ip_mkroute_input(struct sk_buff *skb,
 	if (err)
 		return err;
 
-	/* put it into the cache */
-	hash = rt_hash(daddr, saddr, fl4->flowi4_iif,
-		       rt_genid(dev_net(rth->dst.dev)));
-	rth = rt_intern_hash(hash, rth, skb, fl4->flowi4_iif);
-	if (IS_ERR(rth))
-		return PTR_ERR(rth);
+	skb_dst_set(skb, &rth->dst);
 	return 0;
 }
 
@@ -2217,9 +1496,9 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 	unsigned int	flags = 0;
 	u32		itag = 0;
 	struct rtable	*rth;
-	unsigned int	hash;
 	int		err = -EINVAL;
 	struct net    *net = dev_net(dev);
+	bool do_cache;
 
 	/* IP on this device is disabled. */
 
@@ -2233,6 +1512,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 	if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr))
 		goto martian_source;
 
+	res.fi = NULL;
 	if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0))
 		goto brd_input;
 
@@ -2308,8 +1588,20 @@ brd_input:
 	RT_CACHE_STAT_INC(in_brd);
 
 local_input:
+	do_cache = false;
+	if (res.fi) {
+		if (!(flags & RTCF_DIRECTSRC) && !itag) {
+			rth = FIB_RES_NH(res).nh_rth_input;
+			if (rt_cache_valid(rth)) {
+				dst_hold(&rth->dst);
+				goto set_and_out;
+			}
+			do_cache = true;
+		}
+	}
+
 	rth = rt_dst_alloc(net->loopback_dev,
-			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false);
+			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache);
 	if (!rth)
 		goto e_nobufs;
 
@@ -2319,31 +1611,23 @@ local_input:
 	rth->dst.tclassid = itag;
 #endif
 
-	rth->rt_key_dst	= daddr;
-	rth->rt_key_src	= saddr;
 	rth->rt_genid = rt_genid(net);
 	rth->rt_flags 	= flags|RTCF_LOCAL;
 	rth->rt_type	= res.type;
-	rth->rt_key_tos	= tos;
-	rth->rt_dst	= daddr;
-	rth->rt_src	= saddr;
-	rth->rt_route_iif = dev->ifindex;
+	rth->rt_is_input = 1;
 	rth->rt_iif	= dev->ifindex;
-	rth->rt_oif	= 0;
-	rth->rt_mark    = skb->mark;
 	rth->rt_pmtu	= 0;
-	rth->rt_gateway	= daddr;
-	rth->fi = NULL;
+	rth->rt_gateway	= 0;
 	if (res.type == RTN_UNREACHABLE) {
 		rth->dst.input= ip_error;
 		rth->dst.error= -err;
 		rth->rt_flags 	&= ~RTCF_LOCAL;
 	}
-	hash = rt_hash(daddr, saddr, fl4.flowi4_iif, rt_genid(net));
-	rth = rt_intern_hash(hash, rth, skb, fl4.flowi4_iif);
+	if (do_cache)
+		rt_cache_route(&FIB_RES_NH(res), rth);
+set_and_out:
+	skb_dst_set(skb, &rth->dst);
 	err = 0;
-	if (IS_ERR(rth))
-		err = PTR_ERR(rth);
 	goto out;
 
 no_route:
@@ -2379,49 +1663,13 @@ martian_source_keep_err:
 	goto out;
 }
 
-int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr,
-			   u8 tos, struct net_device *dev, bool noref)
+int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+		   u8 tos, struct net_device *dev)
 {
-	struct rtable	*rth;
-	unsigned int	hash;
-	int iif = dev->ifindex;
-	struct net *net;
 	int res;
 
-	net = dev_net(dev);
-
 	rcu_read_lock();
 
-	if (!rt_caching(net))
-		goto skip_cache;
-
-	tos &= IPTOS_RT_MASK;
-	hash = rt_hash(daddr, saddr, iif, rt_genid(net));
-
-	for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
-	     rth = rcu_dereference(rth->dst.rt_next)) {
-		if ((((__force u32)rth->rt_key_dst ^ (__force u32)daddr) |
-		     ((__force u32)rth->rt_key_src ^ (__force u32)saddr) |
-		     (rth->rt_route_iif ^ iif) |
-		     (rth->rt_key_tos ^ tos)) == 0 &&
-		    rth->rt_mark == skb->mark &&
-		    net_eq(dev_net(rth->dst.dev), net) &&
-		    !rt_is_expired(rth)) {
-			if (noref) {
-				dst_use_noref(&rth->dst, jiffies);
-				skb_dst_set_noref(skb, &rth->dst);
-			} else {
-				dst_use(&rth->dst, jiffies);
-				skb_dst_set(skb, &rth->dst);
-			}
-			RT_CACHE_STAT_INC(in_hit);
-			rcu_read_unlock();
-			return 0;
-		}
-		RT_CACHE_STAT_INC(in_hlist_search);
-	}
-
-skip_cache:
 	/* Multicast recognition logic is moved from route cache to here.
 	   The problem was that too many Ethernet cards have broken/missing
 	   hardware multicast filters :-( As result the host on multicasting
@@ -2459,17 +1707,16 @@ skip_cache:
 	rcu_read_unlock();
 	return res;
 }
-EXPORT_SYMBOL(ip_route_input_common);
+EXPORT_SYMBOL(ip_route_input);
 
 /* called with rcu_read_lock() */
 static struct rtable *__mkroute_output(const struct fib_result *res,
-				       const struct flowi4 *fl4,
-				       __be32 orig_daddr, __be32 orig_saddr,
-				       int orig_oif, __u8 orig_rtos,
+				       const struct flowi4 *fl4, int orig_oif,
 				       struct net_device *dev_out,
 				       unsigned int flags)
 {
 	struct fib_info *fi = res->fi;
+	struct fib_nh_exception *fnhe;
 	struct in_device *in_dev;
 	u16 type = res->type;
 	struct rtable *rth;
@@ -2508,29 +1755,33 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
 			fi = NULL;
 	}
 
+	fnhe = NULL;
+	if (fi) {
+		fnhe = find_exception(&FIB_RES_NH(*res), fl4->daddr);
+		if (!fnhe) {
+			rth = FIB_RES_NH(*res).nh_rth_output;
+			if (rt_cache_valid(rth)) {
+				dst_hold(&rth->dst);
+				return rth;
+			}
+		}
+	}
 	rth = rt_dst_alloc(dev_out,
 			   IN_DEV_CONF_GET(in_dev, NOPOLICY),
-			   IN_DEV_CONF_GET(in_dev, NOXFRM));
+			   IN_DEV_CONF_GET(in_dev, NOXFRM),
+			   fi && !fnhe);
 	if (!rth)
 		return ERR_PTR(-ENOBUFS);
 
 	rth->dst.output = ip_output;
 
-	rth->rt_key_dst	= orig_daddr;
-	rth->rt_key_src	= orig_saddr;
 	rth->rt_genid = rt_genid(dev_net(dev_out));
 	rth->rt_flags	= flags;
 	rth->rt_type	= type;
-	rth->rt_key_tos	= orig_rtos;
-	rth->rt_dst	= fl4->daddr;
-	rth->rt_src	= fl4->saddr;
-	rth->rt_route_iif = 0;
+	rth->rt_is_input = 0;
 	rth->rt_iif	= orig_oif ? : dev_out->ifindex;
-	rth->rt_oif	= orig_oif;
-	rth->rt_mark    = fl4->flowi4_mark;
 	rth->rt_pmtu	= 0;
-	rth->rt_gateway = fl4->daddr;
-	rth->fi = NULL;
+	rth->rt_gateway = 0;
 
 	RT_CACHE_STAT_INC(out_slow_tot);
 
@@ -2553,36 +1804,28 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
 #endif
 	}
 
-	rt_set_nexthop(rth, fl4, res, fi, type, 0);
-
-	if (fl4->flowi4_flags & FLOWI_FLAG_RT_NOCACHE)
-		rth->dst.flags |= DST_NOCACHE;
+	rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0);
 
 	return rth;
 }
 
 /*
  * Major route resolver routine.
- * called with rcu_read_lock();
  */
 
-static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4)
+struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4)
 {
 	struct net_device *dev_out = NULL;
 	__u8 tos = RT_FL_TOS(fl4);
 	unsigned int flags = 0;
 	struct fib_result res;
 	struct rtable *rth;
-	__be32 orig_daddr;
-	__be32 orig_saddr;
 	int orig_oif;
 
 	res.tclassid	= 0;
 	res.fi		= NULL;
 	res.table	= NULL;
 
-	orig_daddr = fl4->daddr;
-	orig_saddr = fl4->saddr;
 	orig_oif = fl4->flowi4_oif;
 
 	fl4->flowi4_iif = net->loopback_dev->ifindex;
@@ -2744,59 +1987,12 @@ static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4)
 
 
 make_route:
-	rth = __mkroute_output(&res, fl4, orig_daddr, orig_saddr, orig_oif,
-			       tos, dev_out, flags);
-	if (!IS_ERR(rth)) {
-		unsigned int hash;
-
-		hash = rt_hash(orig_daddr, orig_saddr, orig_oif,
-			       rt_genid(dev_net(dev_out)));
-		rth = rt_intern_hash(hash, rth, NULL, orig_oif);
-	}
+	rth = __mkroute_output(&res, fl4, orig_oif, dev_out, flags);
 
 out:
 	rcu_read_unlock();
 	return rth;
 }
-
-struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *flp4)
-{
-	struct rtable *rth;
-	unsigned int hash;
-
-	if (!rt_caching(net))
-		goto slow_output;
-
-	hash = rt_hash(flp4->daddr, flp4->saddr, flp4->flowi4_oif, rt_genid(net));
-
-	rcu_read_lock_bh();
-	for (rth = rcu_dereference_bh(rt_hash_table[hash].chain); rth;
-		rth = rcu_dereference_bh(rth->dst.rt_next)) {
-		if (rth->rt_key_dst == flp4->daddr &&
-		    rth->rt_key_src == flp4->saddr &&
-		    rt_is_output_route(rth) &&
-		    rth->rt_oif == flp4->flowi4_oif &&
-		    rth->rt_mark == flp4->flowi4_mark &&
-		    !((rth->rt_key_tos ^ flp4->flowi4_tos) &
-			    (IPTOS_RT_MASK | RTO_ONLINK)) &&
-		    net_eq(dev_net(rth->dst.dev), net) &&
-		    !rt_is_expired(rth)) {
-			dst_use(&rth->dst, jiffies);
-			RT_CACHE_STAT_INC(out_hit);
-			rcu_read_unlock_bh();
-			if (!flp4->saddr)
-				flp4->saddr = rth->rt_src;
-			if (!flp4->daddr)
-				flp4->daddr = rth->rt_dst;
-			return rth;
-		}
-		RT_CACHE_STAT_INC(out_hlist_search);
-	}
-	rcu_read_unlock_bh();
-
-slow_output:
-	return ip_route_output_slow(net, flp4);
-}
 EXPORT_SYMBOL_GPL(__ip_route_output_key);
 
 static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie)
@@ -2830,7 +2026,6 @@ static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst,
 static struct dst_ops ipv4_dst_blackhole_ops = {
 	.family			=	AF_INET,
 	.protocol		=	cpu_to_be16(ETH_P_IP),
-	.destroy		=	ipv4_dst_destroy,
 	.check			=	ipv4_blackhole_dst_check,
 	.mtu			=	ipv4_blackhole_mtu,
 	.default_advmss		=	ipv4_default_advmss,
@@ -2842,9 +2037,10 @@ static struct dst_ops ipv4_dst_blackhole_ops = {
 
 struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig)
 {
-	struct rtable *rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, 0, 0);
 	struct rtable *ort = (struct rtable *) dst_orig;
+	struct rtable *rt;
 
+	rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_NONE, 0);
 	if (rt) {
 		struct dst_entry *new = &rt->dst;
 
@@ -2856,24 +2052,14 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
 		if (new->dev)
 			dev_hold(new->dev);
 
-		rt->rt_key_dst = ort->rt_key_dst;
-		rt->rt_key_src = ort->rt_key_src;
-		rt->rt_key_tos = ort->rt_key_tos;
-		rt->rt_route_iif = ort->rt_route_iif;
+		rt->rt_is_input = ort->rt_is_input;
 		rt->rt_iif = ort->rt_iif;
-		rt->rt_oif = ort->rt_oif;
-		rt->rt_mark = ort->rt_mark;
 		rt->rt_pmtu = ort->rt_pmtu;
 
 		rt->rt_genid = rt_genid(net);
 		rt->rt_flags = ort->rt_flags;
 		rt->rt_type = ort->rt_type;
-		rt->rt_dst = ort->rt_dst;
-		rt->rt_src = ort->rt_src;
 		rt->rt_gateway = ort->rt_gateway;
-		rt->fi = ort->fi;
-		if (rt->fi)
-			atomic_inc(&rt->fi->fib_clntref);
 
 		dst_free(new);
 	}
@@ -2900,9 +2086,9 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,
 }
 EXPORT_SYMBOL_GPL(ip_route_output_flow);
 
-static int rt_fill_info(struct net *net,
-			struct sk_buff *skb, u32 pid, u32 seq, int event,
-			int nowait, unsigned int flags)
+static int rt_fill_info(struct net *net,  __be32 dst, __be32 src,
+			struct flowi4 *fl4, struct sk_buff *skb, u32 pid,
+			u32 seq, int event, int nowait, unsigned int flags)
 {
 	struct rtable *rt = skb_rtable(skb);
 	struct rtmsg *r;
@@ -2919,7 +2105,7 @@ static int rt_fill_info(struct net *net,
 	r->rtm_family	 = AF_INET;
 	r->rtm_dst_len	= 32;
 	r->rtm_src_len	= 0;
-	r->rtm_tos	= rt->rt_key_tos;
+	r->rtm_tos	= fl4->flowi4_tos;
 	r->rtm_table	= RT_TABLE_MAIN;
 	if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN))
 		goto nla_put_failure;
@@ -2930,11 +2116,11 @@ static int rt_fill_info(struct net *net,
 	if (rt->rt_flags & RTCF_NOTIFY)
 		r->rtm_flags |= RTM_F_NOTIFY;
 
-	if (nla_put_be32(skb, RTA_DST, rt->rt_dst))
+	if (nla_put_be32(skb, RTA_DST, dst))
 		goto nla_put_failure;
-	if (rt->rt_key_src) {
+	if (src) {
 		r->rtm_src_len = 32;
-		if (nla_put_be32(skb, RTA_SRC, rt->rt_key_src))
+		if (nla_put_be32(skb, RTA_SRC, src))
 			goto nla_put_failure;
 	}
 	if (rt->dst.dev &&
@@ -2946,11 +2132,11 @@ static int rt_fill_info(struct net *net,
 		goto nla_put_failure;
 #endif
 	if (!rt_is_input_route(rt) &&
-	    rt->rt_src != rt->rt_key_src) {
-		if (nla_put_be32(skb, RTA_PREFSRC, rt->rt_src))
+	    fl4->saddr != src) {
+		if (nla_put_be32(skb, RTA_PREFSRC, fl4->saddr))
 			goto nla_put_failure;
 	}
-	if (rt->rt_dst != rt->rt_gateway &&
+	if (rt->rt_gateway &&
 	    nla_put_be32(skb, RTA_GATEWAY, rt->rt_gateway))
 		goto nla_put_failure;
 
@@ -2960,8 +2146,8 @@ static int rt_fill_info(struct net *net,
 	if (rtnetlink_put_metrics(skb, metrics) < 0)
 		goto nla_put_failure;
 
-	if (rt->rt_mark &&
-	    nla_put_be32(skb, RTA_MARK, rt->rt_mark))
+	if (fl4->flowi4_mark &&
+	    nla_put_be32(skb, RTA_MARK, fl4->flowi4_mark))
 		goto nla_put_failure;
 
 	error = rt->dst.error;
@@ -2974,29 +2160,8 @@ static int rt_fill_info(struct net *net,
 	}
 
 	if (rt_is_input_route(rt)) {
-#ifdef CONFIG_IP_MROUTE
-		__be32 dst = rt->rt_dst;
-
-		if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) &&
-		    IPV4_DEVCONF_ALL(net, MC_FORWARDING)) {
-			int err = ipmr_get_route(net, skb,
-						 rt->rt_src, rt->rt_dst,
-						 r, nowait);
-			if (err <= 0) {
-				if (!nowait) {
-					if (err == 0)
-						return 0;
-					goto nla_put_failure;
-				} else {
-					if (err == -EMSGSIZE)
-						goto nla_put_failure;
-					error = err;
-				}
-			}
-		} else
-#endif
-			if (nla_put_u32(skb, RTA_IIF, rt->rt_iif))
-				goto nla_put_failure;
+		if (nla_put_u32(skb, RTA_IIF, rt->rt_iif))
+			goto nla_put_failure;
 	}
 
 	if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0)
@@ -3015,6 +2180,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void
 	struct rtmsg *rtm;
 	struct nlattr *tb[RTA_MAX+1];
 	struct rtable *rt = NULL;
+	struct flowi4 fl4;
 	__be32 dst = 0;
 	__be32 src = 0;
 	u32 iif;
@@ -3049,6 +2215,13 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void
 	iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0;
 	mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0;
 
+	memset(&fl4, 0, sizeof(fl4));
+	fl4.daddr = dst;
+	fl4.saddr = src;
+	fl4.flowi4_tos = rtm->rtm_tos;
+	fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0;
+	fl4.flowi4_mark = mark;
+
 	if (iif) {
 		struct net_device *dev;
 
@@ -3069,13 +2242,6 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void
 		if (err == 0 && rt->dst.error)
 			err = -rt->dst.error;
 	} else {
-		struct flowi4 fl4 = {
-			.daddr = dst,
-			.saddr = src,
-			.flowi4_tos = rtm->rtm_tos,
-			.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0,
-			.flowi4_mark = mark,
-		};
 		rt = ip_route_output_key(net, &fl4);
 
 		err = 0;
@@ -3090,7 +2256,8 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void
 	if (rtm->rtm_flags & RTM_F_NOTIFY)
 		rt->rt_flags |= RTCF_NOTIFY;
 
-	err = rt_fill_info(net, skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
+	err = rt_fill_info(net, dst, src, &fl4, skb,
+			   NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
 			   RTM_NEWROUTE, 0, 0);
 	if (err <= 0)
 		goto errout_free;
@@ -3106,43 +2273,6 @@ errout_free:
 
 int ip_rt_dump(struct sk_buff *skb,  struct netlink_callback *cb)
 {
-	struct rtable *rt;
-	int h, s_h;
-	int idx, s_idx;
-	struct net *net;
-
-	net = sock_net(skb->sk);
-
-	s_h = cb->args[0];
-	if (s_h < 0)
-		s_h = 0;
-	s_idx = idx = cb->args[1];
-	for (h = s_h; h <= rt_hash_mask; h++, s_idx = 0) {
-		if (!rt_hash_table[h].chain)
-			continue;
-		rcu_read_lock_bh();
-		for (rt = rcu_dereference_bh(rt_hash_table[h].chain), idx = 0; rt;
-		     rt = rcu_dereference_bh(rt->dst.rt_next), idx++) {
-			if (!net_eq(dev_net(rt->dst.dev), net) || idx < s_idx)
-				continue;
-			if (rt_is_expired(rt))
-				continue;
-			skb_dst_set_noref(skb, &rt->dst);
-			if (rt_fill_info(net, skb, NETLINK_CB(cb->skb).pid,
-					 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
-					 1, NLM_F_MULTI) <= 0) {
-				skb_dst_drop(skb);
-				rcu_read_unlock_bh();
-				goto done;
-			}
-			skb_dst_drop(skb);
-		}
-		rcu_read_unlock_bh();
-	}
-
-done:
-	cb->args[0] = h;
-	cb->args[1] = idx;
 	return skb->len;
 }
 
@@ -3376,22 +2506,6 @@ static __net_initdata struct pernet_operations ipv4_inetpeer_ops = {
 struct ip_rt_acct __percpu *ip_rt_acct __read_mostly;
 #endif /* CONFIG_IP_ROUTE_CLASSID */
 
-static __initdata unsigned long rhash_entries;
-static int __init set_rhash_entries(char *str)
-{
-	ssize_t ret;
-
-	if (!str)
-		return 0;
-
-	ret = kstrtoul(str, 0, &rhash_entries);
-	if (ret)
-		return 0;
-
-	return 1;
-}
-__setup("rhash_entries=", set_rhash_entries);
-
 int __init ip_rt_init(void)
 {
 	int rc = 0;
@@ -3414,31 +2528,12 @@ int __init ip_rt_init(void)
 	if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0)
 		panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n");
 
-	rt_hash_table = (struct rt_hash_bucket *)
-		alloc_large_system_hash("IP route cache",
-					sizeof(struct rt_hash_bucket),
-					rhash_entries,
-					(totalram_pages >= 128 * 1024) ?
-					15 : 17,
-					0,
-					&rt_hash_log,
-					&rt_hash_mask,
-					0,
-					rhash_entries ? 0 : 512 * 1024);
-	memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket));
-	rt_hash_lock_init();
-
-	ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1);
-	ip_rt_max_size = (rt_hash_mask + 1) * 16;
+	ipv4_dst_ops.gc_thresh = ~0;
+	ip_rt_max_size = INT_MAX;
 
 	devinet_init();
 	ip_fib_init();
 
-	INIT_DELAYED_WORK_DEFERRABLE(&expires_work, rt_worker_func);
-	expires_ljiffies = jiffies;
-	schedule_delayed_work(&expires_work,
-		net_random() % ip_rt_gc_interval + ip_rt_gc_interval);
-
 	if (ip_rt_proc_init())
 		pr_err("Unable to create route proc files\n");
 #ifdef CONFIG_XFRM