Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

[cascardo/linux.git] / net / ipv4 / route.c

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 9a20663..7047069 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -130,6 +130,7 @@ 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 int redirect_genid;
 
 /*
  *     Interface to generic destination cache.
@@ -415,9 +416,13 @@ static int rt_cache_seq_show(struct seq_file *seq, void *v)
        else {
                struct rtable *r = v;
                struct neighbour *n;
-               int len;
+               int len, HHUptod;
 
+               rcu_read_lock();
                n = dst_get_neighbour(&r->dst);
+               HHUptod = (n && (n->nud_state & NUD_CONNECTED)) ? 1 : 0;
+               rcu_read_unlock();
+
                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 : "*",
@@ -431,7 +436,7 @@ static int rt_cache_seq_show(struct seq_file *seq, void *v)
                              dst_metric(&r->dst, RTAX_RTTVAR)),
                        r->rt_key_tos,
                        -1,
-                       (n && (n->nud_state & NUD_CONNECTED)) ? 1 : 0,
+                       HHUptod,
                        r->rt_spec_dst, &len);
 
                seq_printf(seq, "%*s\n", 127 - len, "");
@@ -836,6 +841,7 @@ static void rt_cache_invalidate(struct net *net)
 
        get_random_bytes(&shuffle, sizeof(shuffle));
        atomic_add(shuffle + 1U, &net->ipv4.rt_genid);
+       redirect_genid++;
 }
 
 /*
@@ -1385,8 +1391,10 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
 
                                peer = rt->peer;
                                if (peer) {
-                                       if (peer->redirect_learned.a4 != new_gw) {
+                                       if (peer->redirect_learned.a4 != new_gw ||
+                                           peer->redirect_genid != redirect_genid) {
                                                peer->redirect_learned.a4 = new_gw;
+                                               peer->redirect_genid = redirect_genid;
                                                atomic_inc(&__rt_peer_genid);
                                        }
                                        check_peer_redir(&rt->dst, peer);
@@ -1679,12 +1687,8 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
 }
 
 
-static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
+static struct rtable *ipv4_validate_peer(struct rtable *rt)
 {
-       struct rtable *rt = (struct rtable *) dst;
-
-       if (rt_is_expired(rt))
-               return NULL;
        if (rt->rt_peer_genid != rt_peer_genid()) {
                struct inet_peer *peer;
 
@@ -1693,17 +1697,29 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
 
                peer = rt->peer;
                if (peer) {
-                       check_peer_pmtu(dst, peer);
+                       check_peer_pmtu(&rt->dst, peer);
 
+                       if (peer->redirect_genid != redirect_genid)
+                               peer->redirect_learned.a4 = 0;
                        if (peer->redirect_learned.a4 &&
                            peer->redirect_learned.a4 != rt->rt_gateway) {
-                               if (check_peer_redir(dst, peer))
+                               if (check_peer_redir(&rt->dst, peer))
                                        return NULL;
                        }
                }
 
                rt->rt_peer_genid = rt_peer_genid();
        }
+       return rt;
+}
+
+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;
+       dst = (struct dst_entry *) ipv4_validate_peer(rt);
        return dst;
 }
 
@@ -1851,6 +1867,8 @@ static void rt_init_metrics(struct rtable *rt, const struct flowi4 *fl4,
                dst_init_metrics(&rt->dst, peer->metrics, false);
 
                check_peer_pmtu(&rt->dst, peer);
+               if (peer->redirect_genid != redirect_genid)
+                       peer->redirect_learned.a4 = 0;
                if (peer->redirect_learned.a4 &&
                    peer->redirect_learned.a4 != rt->rt_gateway) {
                        rt->rt_gateway = peer->redirect_learned.a4;
@@ -2356,6 +2374,9 @@ 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)) {
+                       rth = ipv4_validate_peer(rth);
+                       if (!rth)
+                               continue;
                        if (noref) {
                                dst_use_noref(&rth->dst, jiffies);
                                skb_dst_set_noref(skb, &rth->dst);
@@ -2731,6 +2752,9 @@ 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)) {
+                       rth = ipv4_validate_peer(rth);
+                       if (!rth)
+                               continue;
                        dst_use(&rth->dst, jiffies);
                        RT_CACHE_STAT_INC(out_hit);
                        rcu_read_unlock_bh();