[PATCH 24/29] netfilter: evict stale entries on netlink dumps

[Pablo Neira Ayuso <pablo@netfilter.org>]

From: Florian Westphal <fw@strlen.de>

When dumping we already have to look at the entire table, so we might
as well toss those entries whose timeout value is in the past.

We also look at every entry during resize operations.
However, eviction there is not as simple because we hold the
global resize lock so we can't evict without adding a 'expired' list
to drop from later.  Considering that resizes are very rare it doesn't
seem worth doing it.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_conntrack_netlink.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 81fd34c..dedbe4b 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -815,14 +815,23 @@ ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 	struct hlist_nulls_node *n;
 	struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 	u_int8_t l3proto = nfmsg->nfgen_family;
-	int res;
+	struct nf_conn *nf_ct_evict[8];
+	int res, i;
 	spinlock_t *lockp;
 
 	last = (struct nf_conn *)cb->args[1];
+	i = 0;
 
 	local_bh_disable();
 	for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 restart:
+		while (i) {
+			i--;
+			if (nf_ct_should_gc(nf_ct_evict[i]))
+				nf_ct_kill(nf_ct_evict[i]);
+			nf_ct_put(nf_ct_evict[i]);
+		}
+
 		lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
 		nf_conntrack_lock(lockp);
 		if (cb->args[0] >= nf_conntrack_htable_size) {
@@ -834,6 +843,13 @@ restart:
 			if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 				continue;
 			ct = nf_ct_tuplehash_to_ctrack(h);
+			if (nf_ct_is_expired(ct)) {
+				if (i < ARRAY_SIZE(nf_ct_evict) &&
+				    atomic_inc_not_zero(&ct->ct_general.use))
+					nf_ct_evict[i++] = ct;
+				continue;
+			}
+
 			if (!net_eq(net, nf_ct_net(ct)))
 				continue;
 
@@ -875,6 +891,13 @@ out:
 	if (last)
 		nf_ct_put(last);
 
+	while (i) {
+		i--;
+		if (nf_ct_should_gc(nf_ct_evict[i]))
+			nf_ct_kill(nf_ct_evict[i]);
+		nf_ct_put(nf_ct_evict[i]);
+	}
+
 	return skb->len;
 }
 
-- 
2.1.4