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Commit 5943634f authored by David S. Miller's avatar David S. Miller
Browse files

ipv4: Maintain redirect and PMTU info in struct rtable again. 



Maintaining this in the inetpeer entries was not the right way to do
this at all.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 87a50699

include/net/inetpeer.h

+0 −4
Original line number Diff line number Diff line
@@ -36,10 +36,6 @@ struct inet_peer { 
	u32			metrics[RTAX_MAX];

	u32			rate_tokens;	/* rate limiting for ICMP */

	unsigned long		rate_last;

	unsigned long		pmtu_expires;

	u32			pmtu_orig;

	u32			pmtu_learned;

	struct inetpeer_addr_base redirect_learned;

	union {

		struct list_head	gc_list;

		struct rcu_head     gc_rcu;

include/net/route.h

+1 −1
Original line number Diff line number Diff line
@@ -65,7 +65,7 @@ struct rtable { 
	__be32			rt_gateway;



	/* Miscellaneous cached information */

	u32			rt_peer_genid;

	u32			rt_pmtu;

	unsigned long		_peer; /* long-living peer info */

	struct fib_info		*fi; /* for client ref to shared metrics */

};

net/ipv4/inetpeer.c

+0 −3
Original line number Diff line number Diff line
@@ -511,9 +511,6 @@ relookup: 
		p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;

		p->rate_tokens = 0;

		p->rate_last = 0;

		p->pmtu_expires = 0;

		p->pmtu_orig = 0;

		memset(&p->redirect_learned, 0, sizeof(p->redirect_learned));

		INIT_LIST_HEAD(&p->gc_list);



		/* Link the node. */

net/ipv4/route.c

+39 −146
Original line number Diff line number Diff line
@@ -669,7 +669,7 @@ static inline int rt_fast_clean(struct rtable *rth) 
static inline int rt_valuable(struct rtable *rth)

{

	return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) ||

		(rt_has_peer(rth) && rt_peer_ptr(rth)->pmtu_expires);

		rth->dst.expires;

}



static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2)
@@ -1242,13 +1242,6 @@ skip_hashing: 
	return rt;

}



static atomic_t __rt_peer_genid = ATOMIC_INIT(0);



static u32 rt_peer_genid(void)

{

	return atomic_read(&__rt_peer_genid);

}



void rt_bind_peer(struct rtable *rt, __be32 daddr, int create)

{

	struct inet_peer_base *base;
@@ -1262,8 +1255,6 @@ void rt_bind_peer(struct rtable *rt, __be32 daddr, int create) 
	if (peer) {

		if (!rt_set_peer(rt, peer))

			inet_putpeer(peer);

		else

			rt->rt_peer_genid = rt_peer_genid();

	}

}
@@ -1323,30 +1314,6 @@ static void rt_del(unsigned int hash, struct rtable *rt) 
	spin_unlock_bh(rt_hash_lock_addr(hash));

}



static void check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)

{

	struct rtable *rt = (struct rtable *) dst;

	__be32 orig_gw = rt->rt_gateway;

	struct neighbour *n;



	dst_confirm(&rt->dst);



	rt->rt_gateway = peer->redirect_learned.a4;



	n = ipv4_neigh_lookup(&rt->dst, NULL, &rt->rt_gateway);

	if (!n) {

		rt->rt_gateway = orig_gw;

		return;

	}

	if (!(n->nud_state & NUD_VALID)) {

		neigh_event_send(n, NULL);

	} else {

		rt->rt_flags |= RTCF_REDIRECTED;

		call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n);

	}

	neigh_release(n);

}



/* called in rcu_read_lock() section */

void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,

		    __be32 saddr, struct net_device *dev)
@@ -1355,7 +1322,6 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, 
	struct in_device *in_dev = __in_dev_get_rcu(dev);

	__be32 skeys[2] = { saddr, 0 };

	int    ikeys[2] = { dev->ifindex, 0 };

	struct inet_peer *peer;

	struct net *net;



	if (!in_dev)
@@ -1388,6 +1354,8 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, 
			rthp = &rt_hash_table[hash].chain;



			while ((rt = rcu_dereference(*rthp)) != NULL) {

				struct neighbour *n;



				rthp = &rt->dst.rt_next;



				if (rt->rt_key_dst != daddr ||
@@ -1401,13 +1369,16 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, 
				    rt->rt_gateway != old_gw)

					continue;



				peer = rt_get_peer_create(rt, rt->rt_dst);

				if (peer) {

					if (peer->redirect_learned.a4 != new_gw) {

						peer->redirect_learned.a4 = new_gw;

						atomic_inc(&__rt_peer_genid);

				n = ipv4_neigh_lookup(&rt->dst, NULL, &new_gw);

				if (n) {

					if (!(n->nud_state & NUD_VALID)) {

						neigh_event_send(n, NULL);

					} else {

						rt->rt_gateway = new_gw;

						rt->rt_flags |= RTCF_REDIRECTED;

						call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n);

					}

					check_peer_redir(&rt->dst, peer);

					neigh_release(n);

				}

			}

		}
@@ -1425,23 +1396,6 @@ reject_redirect: 
	;

}



static bool peer_pmtu_expired(struct inet_peer *peer)

{

	unsigned long orig = ACCESS_ONCE(peer->pmtu_expires);



	return orig &&

	       time_after_eq(jiffies, orig) &&

	       cmpxchg(&peer->pmtu_expires, orig, 0) == orig;

}



static bool peer_pmtu_cleaned(struct inet_peer *peer)

{

	unsigned long orig = ACCESS_ONCE(peer->pmtu_expires);



	return orig &&

	       cmpxchg(&peer->pmtu_expires, orig, 0) == orig;

}



static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)

{

	struct rtable *rt = (struct rtable *)dst;
@@ -1451,16 +1405,13 @@ static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) 
		if (dst->obsolete > 0) {

			ip_rt_put(rt);

			ret = NULL;

		} else if (rt->rt_flags & RTCF_REDIRECTED) {

		} 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);

			ret = NULL;

		} else if (rt_has_peer(rt)) {

			struct inet_peer *peer = rt_peer_ptr(rt);

			if (peer_pmtu_expired(peer))

				dst_metric_set(dst, RTAX_MTU, peer->pmtu_orig);

		}

	}

	return ret;
@@ -1604,50 +1555,17 @@ out: kfree_skb(skb); 
	return 0;

}



static void check_peer_pmtu(struct dst_entry *dst, struct inet_peer *peer)

{

	unsigned long expires = ACCESS_ONCE(peer->pmtu_expires);



	if (!expires)

		return;

	if (time_before(jiffies, expires)) {

		u32 orig_dst_mtu = dst_mtu(dst);

		if (peer->pmtu_learned < orig_dst_mtu) {

			if (!peer->pmtu_orig)

				peer->pmtu_orig = dst_metric_raw(dst, RTAX_MTU);

			dst_metric_set(dst, RTAX_MTU, peer->pmtu_learned);

		}

	} else if (cmpxchg(&peer->pmtu_expires, expires, 0) == expires)

		dst_metric_set(dst, RTAX_MTU, peer->pmtu_orig);

}



static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)

{

	struct rtable *rt = (struct rtable *) dst;

	struct inet_peer *peer;



	dst_confirm(dst);



	peer = rt_get_peer_create(rt, rt->rt_dst);

	if (peer) {

		unsigned long pmtu_expires = ACCESS_ONCE(peer->pmtu_expires);



	if (mtu < ip_rt_min_pmtu)

		mtu = ip_rt_min_pmtu;

		if (!pmtu_expires || mtu < peer->pmtu_learned) {



			pmtu_expires = jiffies + ip_rt_mtu_expires;

			if (!pmtu_expires)

				pmtu_expires = 1UL;



			peer->pmtu_learned = mtu;

			peer->pmtu_expires = pmtu_expires;



			atomic_inc(&__rt_peer_genid);

			rt->rt_peer_genid = rt_peer_genid();

		}

		check_peer_pmtu(dst, peer);

	}

	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,
@@ -1679,30 +1597,12 @@ void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) 
}

EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu);



static void ipv4_validate_peer(struct rtable *rt)

{

	if (rt->rt_peer_genid != rt_peer_genid()) {

		struct inet_peer *peer = rt_get_peer(rt, rt->rt_dst);



		if (peer) {

			check_peer_pmtu(&rt->dst, peer);



			if (peer->redirect_learned.a4 &&

			    peer->redirect_learned.a4 != rt->rt_gateway)

				check_peer_redir(&rt->dst, peer);

		}



		rt->rt_peer_genid = rt_peer_genid();

	}

}



static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)

{

	struct rtable *rt = (struct rtable *) dst;



	if (rt_is_expired(rt))

		return NULL;

	ipv4_validate_peer(rt);

	return dst;

}
@@ -1728,11 +1628,8 @@ static void ipv4_link_failure(struct sk_buff *skb) 
	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);



	rt = skb_rtable(skb);

	if (rt && rt_has_peer(rt)) {

		struct inet_peer *peer = rt_peer_ptr(rt);

		if (peer_pmtu_cleaned(peer))

			dst_metric_set(&rt->dst, RTAX_MTU, peer->pmtu_orig);

	}

	if (rt)

		dst_set_expires(&rt->dst, 0);

}



static int ip_rt_bug(struct sk_buff *skb)
@@ -1812,7 +1709,13 @@ static unsigned int ipv4_default_advmss(const struct dst_entry *dst) 
static unsigned int ipv4_mtu(const struct dst_entry *dst)

{

	const struct rtable *rt = (const struct rtable *) dst;

	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);

	unsigned int mtu = rt->rt_pmtu;



	if (mtu && time_after_eq(jiffies, rt->dst.expires))

		mtu = 0;



	if (!mtu)

		mtu = dst_metric_raw(dst, RTAX_MTU);



	if (mtu && rt_is_output_route(rt))

		return mtu;
@@ -1843,19 +1746,10 @@ static void rt_init_metrics(struct rtable *rt, const struct flowi4 *fl4, 
	peer = inet_getpeer_v4(base, rt->rt_dst, 0);

	if (peer) {

		__rt_set_peer(rt, peer);

		rt->rt_peer_genid = rt_peer_genid();

		if (inet_metrics_new(peer))

			memcpy(peer->metrics, fi->fib_metrics,

			       sizeof(u32) * RTAX_MAX);

		dst_init_metrics(&rt->dst, peer->metrics, false);



		check_peer_pmtu(&rt->dst, peer);



		if (peer->redirect_learned.a4 &&

		    peer->redirect_learned.a4 != rt->rt_gateway) {

			rt->rt_gateway = peer->redirect_learned.a4;

			rt->rt_flags |= RTCF_REDIRECTED;

		}

	} else {

		if (fi->fib_metrics != (u32 *) dst_default_metrics) {

			rt->fi = fi;
@@ -1955,8 +1849,8 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, 
	rth->rt_iif	= dev->ifindex;

	rth->rt_oif	= 0;

	rth->rt_mark    = skb->mark;

	rth->rt_pmtu	= 0;

	rth->rt_gateway	= daddr;

	rth->rt_peer_genid = 0;

	rt_init_peer(rth, dev_net(dev)->ipv4.peers);

	rth->fi = NULL;

	if (our) {
@@ -2081,8 +1975,8 @@ static int __mkroute_input(struct sk_buff *skb, 
	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->rt_peer_genid = 0;

	rt_init_peer(rth, &res->table->tb_peers);

	rth->fi = NULL;
@@ -2260,8 +2154,8 @@ local_input: 
	rth->rt_iif	= dev->ifindex;

	rth->rt_oif	= 0;

	rth->rt_mark    = skb->mark;

	rth->rt_pmtu	= 0;

	rth->rt_gateway	= daddr;

	rth->rt_peer_genid = 0;

	rt_init_peer(rth, net->ipv4.peers);

	rth->fi = NULL;

	if (res.type == RTN_UNREACHABLE) {
@@ -2337,7 +2231,6 @@ int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr, 
		    rth->rt_mark == skb->mark &&

		    net_eq(dev_net(rth->dst.dev), net) &&

		    !rt_is_expired(rth)) {

			ipv4_validate_peer(rth);

			if (noref) {

				dst_use_noref(&rth->dst, jiffies);

				skb_dst_set_noref(skb, &rth->dst);
@@ -2459,8 +2352,8 @@ static struct rtable *__mkroute_output(const struct fib_result *res, 
	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->rt_peer_genid = 0;

	rt_init_peer(rth, (res->table ?

			   &res->table->tb_peers :

			   dev_net(dev_out)->ipv4.peers));
@@ -2717,7 +2610,6 @@ struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *flp4) 
			    (IPTOS_RT_MASK | RTO_ONLINK)) &&

		    net_eq(dev_net(rth->dst.dev), net) &&

		    !rt_is_expired(rth)) {

			ipv4_validate_peer(rth);

			dst_use(&rth->dst, jiffies);

			RT_CACHE_STAT_INC(out_hit);

			rcu_read_unlock_bh();
@@ -2794,6 +2686,7 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or 
		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;
@@ -2896,14 +2789,14 @@ static int rt_fill_info(struct net *net, 
		const struct inet_peer *peer = rt_peer_ptr(rt);

		inet_peer_refcheck(peer);

		id = atomic_read(&peer->ip_id_count) & 0xffff;

		expires = ACCESS_ONCE(peer->pmtu_expires);

	}

	expires = rt->dst.expires;

	if (expires) {

		if (time_before(jiffies, expires))

			expires -= jiffies;

		else

			expires = 0;

	}

	}



	if (rt_is_input_route(rt)) {

#ifdef CONFIG_IP_MROUTE

net/ipv4/xfrm4_policy.c

+1 −0
Original line number Diff line number Diff line
@@ -100,6 +100,7 @@ static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, 
	xdst->u.rt.rt_src = rt->rt_src;

	xdst->u.rt.rt_dst = rt->rt_dst;

	xdst->u.rt.rt_gateway = rt->rt_gateway;

	xdst->u.rt.rt_pmtu = rt->rt_pmtu;



	return 0;

}