5 files changed, 18 insertions, 22 deletions

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 5098ee7b7e0e..32786a044718 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -61,7 +61,7 @@ void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
 void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
 void inet_frag_destroy(struct inet_frag_queue *q,
                                 struct inet_frags *f, int *work);
-int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);
+int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f, bool force);
 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
                 struct inet_frags *f, void *key, unsigned int hash)
         __releases(&f->lock);
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 85190e69297b..4750d2b74d79 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -89,7 +89,7 @@ void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f)
         nf->low_thresh = 0;
 
         local_bh_disable();
-        inet_frag_evictor(nf, f);
+        inet_frag_evictor(nf, f, true);
         local_bh_enable();
 }
 EXPORT_SYMBOL(inet_frags_exit_net);
@@ -158,11 +158,16 @@ void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f,
 }
 EXPORT_SYMBOL(inet_frag_destroy);
 
-int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f)
+int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f, bool force)
 {
         struct inet_frag_queue *q;
         int work, evicted = 0;
 
+        if (!force) {
+                if (atomic_read(&nf->mem) <= nf->high_thresh)
+                        return 0;
+        }
+
         work = atomic_read(&nf->mem) - nf->low_thresh;
         while (work > 0) {
                 read_lock(&f->lock);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index fa6a12c51066..448e68546827 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -219,7 +219,7 @@ static void ip_evictor(struct net *net)
 {
         int evicted;
 
-        evicted = inet_frag_evictor(&net->ipv4.frags, &ip4_frags);
+        evicted = inet_frag_evictor(&net->ipv4.frags, &ip4_frags, false);
         if (evicted)
                 IP_ADD_STATS_BH(net, IPSTATS_MIB_REASMFAILS, evicted);
 }
@@ -684,8 +684,7 @@ int ip_defrag(struct sk_buff *skb, u32 user)
         IP_INC_STATS_BH(net, IPSTATS_MIB_REASMREQDS);
 
         /* Start by cleaning up the memory. */
-        if (atomic_read(&net->ipv4.frags.mem) > net->ipv4.frags.high_thresh)
-                ip_evictor(net);
+        ip_evictor(net);
 
         /* Lookup (or create) queue header */
         if ((qp = ip_find(net, ip_hdr(skb), user)) != NULL) {
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 54274c33a0b1..1af12fde08df 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -566,11 +566,9 @@ struct sk_buff *nf_ct_frag6_gather(struct sk_buff *skb, u32 user)
         hdr = ipv6_hdr(clone);
         fhdr = (struct frag_hdr *)skb_transport_header(clone);
 
-        if (atomic_read(&net->nf_frag.frags.mem) > net->nf_frag.frags.high_thresh) {
-                local_bh_disable();
-                inet_frag_evictor(&net->nf_frag.frags, &nf_frags);
-                local_bh_enable();
-        }
+        local_bh_disable();
+        inet_frag_evictor(&net->nf_frag.frags, &nf_frags, false);
+        local_bh_enable();
 
         fq = fq_find(net, fhdr->identification, user, &hdr->saddr, &hdr->daddr);
         if (fq == NULL) {
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index cf74f4e79356..da8a4e301b1b 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -131,15 +131,6 @@ void ip6_frag_init(struct inet_frag_queue *q, void *a)
 }
 EXPORT_SYMBOL(ip6_frag_init);
 
-static void ip6_evictor(struct net *net, struct inet6_dev *idev)
-{
-        int evicted;
-
-        evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
-        if (evicted)
-                IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
-}
-
 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
                            struct inet_frags *frags)
 {
@@ -515,6 +506,7 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
         struct frag_queue *fq;
         const struct ipv6hdr *hdr = ipv6_hdr(skb);
         struct net *net = dev_net(skb_dst(skb)->dev);
+        int evicted;
 
         IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
 
@@ -539,8 +531,10 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
                 return 1;
         }
 
-        if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
-                ip6_evictor(net, ip6_dst_idev(skb_dst(skb)));
+        evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags, false);
+        if (evicted)
+                IP6_ADD_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
+                                 IPSTATS_MIB_REASMFAILS, evicted);
 
         fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr);
         if (fq != NULL) {