openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

netfilter: evict stale entries on netlink dumps 

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>
This commit is contained in:
Florian Westphal 2016-08-25 15:33:32 +02:00 committed by Pablo Neira Ayuso
parent f330a7fdbe
commit 2344d64ec7
1 changed files with 24 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
net/netfilter/nf_conntrack_netlink.c
View File

@ -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 @@ ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
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 @@ ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
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;
}