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Message-ID: <49C9AAAC.30607@cosmosbay.com>
Date: Wed, 25 Mar 2009 04:53:16 +0100
From: Eric Dumazet <dada1@...mosbay.com>
To: Patrick McHardy <kaber@...sh.net>
CC: Netfilter Developers <netfilter-devel@...r.kernel.org>,
Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH] conntrack: Reduce conntrack count in nf_conntrack_free()
Patrick McHardy a écrit :
> Eric Dumazet wrote:
>> Eric Dumazet a écrit :
>>> Patrick McHardy a écrit :
>>>> Eric Dumazet wrote:
>>
>>>>> Maybe we could use SLAB_DESTROY_BY_RCU thing and no more call_rcu()
>>>>> queueing
>>>>> problem. That would better use CPU caches as well...
>>>> I'm not sure I understand the rules correctly, but we'd still
>>>> have to wait for the grace period before an object can be reused,
>>>> no?
>>> No we dont have to, but we must do additionnal checks after getting
>>> a reference on object found on lookup.
>>> (We must re-check the keys used during search)
>>>
>>> This re-check is not very expensive since everything is hot in cpu
>>> cache.
>>>
>>> Check Documentation/RCU/rculist_nulls.txt for some documentation.
>>>
>>
>> Patrick, I can work on this if you want, since this stuff is fresh
>> in my head, let me know if you already challenged it or not :)
>
> I'm still looking at the details, if you want to take care of this,
> that would be great .)
>
>
I have a litle problem on __nf_conntrack_find() being exported.
Problem is that with SLAB_DESTROY_BY_RCU we must take a reference on object
to recheck it. So ideally only nf_conntrack_find_get() should be used,
or callers of __nf_conntrack_find() should lock nf_conntrack_lock
(as properly done for example in net/netfilter/nf_conntrack_netlink.c, line 1292)
Here is preliminary patch for review (not tested at all, its 4h50 am here :) )
Could you help me, by checking __nf_conntrack_find() use in net/netfilter/xt_connlimit.c ?
and line 1246 of net/netfilter/nf_conntrack_netlink.c
This part is a litle bit gray for me. :)
Thank you
(Patch against nf-next-2.6 tree of course)
Eric
include/net/netfilter/nf_conntrack.h | 14 -
include/net/netfilter/nf_conntrack_tuple.h | 6
include/net/netns/conntrack.h | 5
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c | 16 -
net/ipv4/netfilter/nf_nat_core.c | 2
net/netfilter/nf_conntrack_core.c | 121 +++++-----
net/netfilter/nf_conntrack_expect.c | 2
net/netfilter/nf_conntrack_helper.c | 7
net/netfilter/nf_conntrack_netlink.c | 7
net/netfilter/nf_conntrack_standalone.c | 16 -
10 files changed, 109 insertions(+), 87 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 4dfb793..6c3f964 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -91,8 +91,7 @@ struct nf_conn_help {
#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
-struct nf_conn
-{
+struct nf_conn {
/* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
plus 1 for any connection(s) we are `master' for */
struct nf_conntrack ct_general;
@@ -126,7 +125,6 @@ struct nf_conn
#ifdef CONFIG_NET_NS
struct net *ct_net;
#endif
- struct rcu_head rcu;
};
static inline struct nf_conn *
@@ -190,9 +188,13 @@ static inline void nf_ct_put(struct nf_conn *ct)
extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
extern void nf_ct_l3proto_module_put(unsigned short l3proto);
-extern struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced);
-extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced,
- unsigned int size);
+/*
+ * Allocate a hashtable of hlist_head (if nulls == 0),
+ * or hlist_nulls_head (if nulls == 1)
+ */
+extern void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls);
+
+extern void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size);
extern struct nf_conntrack_tuple_hash *
__nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple);
diff --git a/include/net/netfilter/nf_conntrack_tuple.h b/include/net/netfilter/nf_conntrack_tuple.h
index f2f6aa7..2628c15 100644
--- a/include/net/netfilter/nf_conntrack_tuple.h
+++ b/include/net/netfilter/nf_conntrack_tuple.h
@@ -12,6 +12,7 @@
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <linux/list_nulls.h>
/* A `tuple' is a structure containing the information to uniquely
identify a connection. ie. if two packets have the same tuple, they
@@ -146,9 +147,8 @@ static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
((enum ip_conntrack_dir)(h)->tuple.dst.dir)
/* Connections have two entries in the hash table: one for each way */
-struct nf_conntrack_tuple_hash
-{
- struct hlist_node hnode;
+struct nf_conntrack_tuple_hash {
+ struct hlist_nulls_node hnnode;
struct nf_conntrack_tuple tuple;
};
diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
index f4498a6..9dc5840 100644
--- a/include/net/netns/conntrack.h
+++ b/include/net/netns/conntrack.h
@@ -2,6 +2,7 @@
#define __NETNS_CONNTRACK_H
#include <linux/list.h>
+#include <linux/list_nulls.h>
#include <asm/atomic.h>
struct ctl_table_header;
@@ -10,9 +11,9 @@ struct nf_conntrack_ecache;
struct netns_ct {
atomic_t count;
unsigned int expect_count;
- struct hlist_head *hash;
+ struct hlist_nulls_head *hash;
struct hlist_head *expect_hash;
- struct hlist_head unconfirmed;
+ struct hlist_nulls_head unconfirmed;
struct ip_conntrack_stat *stat;
#ifdef CONFIG_NF_CONNTRACK_EVENTS
struct nf_conntrack_ecache *ecache;
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
index 6ba5c55..fcbcf62 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -25,30 +25,30 @@ struct ct_iter_state {
unsigned int bucket;
};
-static struct hlist_node *ct_get_first(struct seq_file *seq)
+static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
{
struct net *net = seq_file_net(seq);
struct ct_iter_state *st = seq->private;
- struct hlist_node *n;
+ struct hlist_nulls_node *n;
for (st->bucket = 0;
st->bucket < nf_conntrack_htable_size;
st->bucket++) {
n = rcu_dereference(net->ct.hash[st->bucket].first);
- if (n)
+ if (!is_a_nulls(n))
return n;
}
return NULL;
}
-static struct hlist_node *ct_get_next(struct seq_file *seq,
- struct hlist_node *head)
+static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
+ struct hlist_nulls_node *head)
{
struct net *net = seq_file_net(seq);
struct ct_iter_state *st = seq->private;
head = rcu_dereference(head->next);
- while (head == NULL) {
+ while (is_a_nulls(head)) {
if (++st->bucket >= nf_conntrack_htable_size)
return NULL;
head = rcu_dereference(net->ct.hash[st->bucket].first);
@@ -56,9 +56,9 @@ static struct hlist_node *ct_get_next(struct seq_file *seq,
return head;
}
-static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
+static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
{
- struct hlist_node *head = ct_get_first(seq);
+ struct hlist_nulls_node *head = ct_get_first(seq);
if (head)
while (pos && (head = ct_get_next(seq, head)))
diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c
index a65cf69..fe65187 100644
--- a/net/ipv4/netfilter/nf_nat_core.c
+++ b/net/ipv4/netfilter/nf_nat_core.c
@@ -679,7 +679,7 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct,
static int __net_init nf_nat_net_init(struct net *net)
{
net->ipv4.nat_bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size,
- &net->ipv4.nat_vmalloced);
+ &net->ipv4.nat_vmalloced, 0);
if (!net->ipv4.nat_bysource)
return -ENOMEM;
return 0;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 55befe5..9f714e9 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -29,6 +29,7 @@
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <linux/mm.h>
+#include <linux/rculist_nulls.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
@@ -163,8 +164,8 @@ static void
clean_from_lists(struct nf_conn *ct)
{
pr_debug("clean_from_lists(%p)\n", ct);
- hlist_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode);
- hlist_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnode);
+ hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
+ hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode);
/* Destroy all pending expectations */
nf_ct_remove_expectations(ct);
@@ -204,8 +205,8 @@ destroy_conntrack(struct nf_conntrack *nfct)
/* We overload first tuple to link into unconfirmed list. */
if (!nf_ct_is_confirmed(ct)) {
- BUG_ON(hlist_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode));
- hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode);
+ BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode));
+ hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
}
NF_CT_STAT_INC(net, delete);
@@ -242,18 +243,26 @@ static void death_by_timeout(unsigned long ul_conntrack)
nf_ct_put(ct);
}
+/*
+ * Warning :
+ * - Caller must take a reference on returned object
+ * and recheck nf_ct_tuple_equal(tuple, &h->tuple)
+ * OR
+ * - Caller must lock nf_conntrack_lock before calling this function
+ */
struct nf_conntrack_tuple_hash *
__nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_tuple_hash *h;
- struct hlist_node *n;
+ struct hlist_nulls_node *n;
unsigned int hash = hash_conntrack(tuple);
/* Disable BHs the entire time since we normally need to disable them
* at least once for the stats anyway.
*/
local_bh_disable();
- hlist_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnode) {
+begin:
+ hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) {
if (nf_ct_tuple_equal(tuple, &h->tuple)) {
NF_CT_STAT_INC(net, found);
local_bh_enable();
@@ -261,6 +270,13 @@ __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple)
}
NF_CT_STAT_INC(net, searched);
}
+ /*
+ * if the nulls value we got at the end of this lookup is
+ * not the expected one, we must restart lookup.
+ * We probably met an item that was moved to another chain.
+ */
+ if (get_nulls_value(n) != hash)
+ goto begin;
local_bh_enable();
return NULL;
@@ -275,11 +291,18 @@ nf_conntrack_find_get(struct net *net, const struct nf_conntrack_tuple *tuple)
struct nf_conn *ct;
rcu_read_lock();
+begin:
h = __nf_conntrack_find(net, tuple);
if (h) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
h = NULL;
+ else {
+ if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple))) {
+ nf_ct_put(ct);
+ goto begin;
+ }
+ }
}
rcu_read_unlock();
@@ -293,9 +316,9 @@ static void __nf_conntrack_hash_insert(struct nf_conn *ct,
{
struct net *net = nf_ct_net(ct);
- hlist_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
+ hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
&net->ct.hash[hash]);
- hlist_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnode,
+ hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode,
&net->ct.hash[repl_hash]);
}
@@ -318,7 +341,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
struct nf_conntrack_tuple_hash *h;
struct nf_conn *ct;
struct nf_conn_help *help;
- struct hlist_node *n;
+ struct hlist_nulls_node *n;
enum ip_conntrack_info ctinfo;
struct net *net;
@@ -350,17 +373,17 @@ __nf_conntrack_confirm(struct sk_buff *skb)
/* See if there's one in the list already, including reverse:
NAT could have grabbed it without realizing, since we're
not in the hash. If there is, we lost race. */
- hlist_for_each_entry(h, n, &net->ct.hash[hash], hnode)
+ hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode)
if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
&h->tuple))
goto out;
- hlist_for_each_entry(h, n, &net->ct.hash[repl_hash], hnode)
+ hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode)
if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple,
&h->tuple))
goto out;
/* Remove from unconfirmed list */
- hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode);
+ hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
__nf_conntrack_hash_insert(ct, hash, repl_hash);
/* Timer relative to confirmation time, not original
@@ -399,14 +422,14 @@ nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
{
struct net *net = nf_ct_net(ignored_conntrack);
struct nf_conntrack_tuple_hash *h;
- struct hlist_node *n;
+ struct hlist_nulls_node *n;
unsigned int hash = hash_conntrack(tuple);
/* Disable BHs the entire time since we need to disable them at
* least once for the stats anyway.
*/
rcu_read_lock_bh();
- hlist_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnode) {
+ hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) {
if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack &&
nf_ct_tuple_equal(tuple, &h->tuple)) {
NF_CT_STAT_INC(net, found);
@@ -430,14 +453,14 @@ static noinline int early_drop(struct net *net, unsigned int hash)
/* Use oldest entry, which is roughly LRU */
struct nf_conntrack_tuple_hash *h;
struct nf_conn *ct = NULL, *tmp;
- struct hlist_node *n;
+ struct hlist_nulls_node *n;
unsigned int i, cnt = 0;
int dropped = 0;
rcu_read_lock();
for (i = 0; i < nf_conntrack_htable_size; i++) {
- hlist_for_each_entry_rcu(h, n, &net->ct.hash[hash],
- hnode) {
+ hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash],
+ hnnode) {
tmp = nf_ct_tuplehash_to_ctrack(h);
if (!test_bit(IPS_ASSURED_BIT, &tmp->status))
ct = tmp;
@@ -508,27 +531,19 @@ struct nf_conn *nf_conntrack_alloc(struct net *net,
#ifdef CONFIG_NET_NS
ct->ct_net = net;
#endif
- INIT_RCU_HEAD(&ct->rcu);
return ct;
}
EXPORT_SYMBOL_GPL(nf_conntrack_alloc);
-static void nf_conntrack_free_rcu(struct rcu_head *head)
-{
- struct nf_conn *ct = container_of(head, struct nf_conn, rcu);
-
- nf_ct_ext_free(ct);
- kmem_cache_free(nf_conntrack_cachep, ct);
-}
-
void nf_conntrack_free(struct nf_conn *ct)
{
struct net *net = nf_ct_net(ct);
nf_ct_ext_destroy(ct);
atomic_dec(&net->ct.count);
- call_rcu(&ct->rcu, nf_conntrack_free_rcu);
+ nf_ct_ext_free(ct);
+ kmem_cache_free(nf_conntrack_cachep, ct);
}
EXPORT_SYMBOL_GPL(nf_conntrack_free);
@@ -594,7 +609,7 @@ init_conntrack(struct net *net,
}
/* Overload tuple linked list to put us in unconfirmed list. */
- hlist_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
+ hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
&net->ct.unconfirmed);
spin_unlock_bh(&nf_conntrack_lock);
@@ -934,17 +949,17 @@ get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data),
{
struct nf_conntrack_tuple_hash *h;
struct nf_conn *ct;
- struct hlist_node *n;
+ struct hlist_nulls_node *n;
spin_lock_bh(&nf_conntrack_lock);
for (; *bucket < nf_conntrack_htable_size; (*bucket)++) {
- hlist_for_each_entry(h, n, &net->ct.hash[*bucket], hnode) {
+ hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (iter(ct, data))
goto found;
}
}
- hlist_for_each_entry(h, n, &net->ct.unconfirmed, hnode) {
+ hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (iter(ct, data))
set_bit(IPS_DYING_BIT, &ct->status);
@@ -992,7 +1007,7 @@ static int kill_all(struct nf_conn *i, void *data)
return 1;
}
-void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, unsigned int size)
+void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size)
{
if (vmalloced)
vfree(hash);
@@ -1060,26 +1075,28 @@ void nf_conntrack_cleanup(struct net *net)
}
}
-struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced)
+void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls)
{
- struct hlist_head *hash;
- unsigned int size, i;
+ struct hlist_nulls_head *hash;
+ unsigned int nr_slots, i;
+ size_t sz;
*vmalloced = 0;
- size = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_head));
- hash = (void*)__get_free_pages(GFP_KERNEL|__GFP_NOWARN,
- get_order(sizeof(struct hlist_head)
- * size));
+ BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head));
+ nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head));
+ sz = nr_slots * sizeof(struct hlist_nulls_head);
+ hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
+ get_order(sz));
if (!hash) {
*vmalloced = 1;
printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n");
- hash = vmalloc(sizeof(struct hlist_head) * size);
+ hash = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
}
- if (hash)
- for (i = 0; i < size; i++)
- INIT_HLIST_HEAD(&hash[i]);
+ if (hash && nulls)
+ for (i = 0; i < nr_slots; i++)
+ INIT_HLIST_NULLS_HEAD(&hash[i], i);
return hash;
}
@@ -1090,7 +1107,7 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
int i, bucket, vmalloced, old_vmalloced;
unsigned int hashsize, old_size;
int rnd;
- struct hlist_head *hash, *old_hash;
+ struct hlist_nulls_head *hash, *old_hash;
struct nf_conntrack_tuple_hash *h;
/* On boot, we can set this without any fancy locking. */
@@ -1101,7 +1118,7 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
if (!hashsize)
return -EINVAL;
- hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced);
+ hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1);
if (!hash)
return -ENOMEM;
@@ -1116,12 +1133,12 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
*/
spin_lock_bh(&nf_conntrack_lock);
for (i = 0; i < nf_conntrack_htable_size; i++) {
- while (!hlist_empty(&init_net.ct.hash[i])) {
- h = hlist_entry(init_net.ct.hash[i].first,
- struct nf_conntrack_tuple_hash, hnode);
- hlist_del_rcu(&h->hnode);
+ while (!hlist_nulls_empty(&init_net.ct.hash[i])) {
+ h = hlist_nulls_entry(init_net.ct.hash[i].first,
+ struct nf_conntrack_tuple_hash, hnnode);
+ hlist_nulls_del_rcu(&h->hnnode);
bucket = __hash_conntrack(&h->tuple, hashsize, rnd);
- hlist_add_head(&h->hnode, &hash[bucket]);
+ hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]);
}
}
old_size = nf_conntrack_htable_size;
@@ -1172,7 +1189,7 @@ static int nf_conntrack_init_init_net(void)
nf_conntrack_cachep = kmem_cache_create("nf_conntrack",
sizeof(struct nf_conn),
- 0, 0, NULL);
+ 0, SLAB_DESTROY_BY_RCU, NULL);
if (!nf_conntrack_cachep) {
printk(KERN_ERR "Unable to create nf_conn slab cache\n");
ret = -ENOMEM;
@@ -1212,7 +1229,7 @@ static int nf_conntrack_init_net(struct net *net)
if (ret < 0)
goto err_ecache;
net->ct.hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size,
- &net->ct.hash_vmalloc);
+ &net->ct.hash_vmalloc, 1);
if (!net->ct.hash) {
ret = -ENOMEM;
printk(KERN_ERR "Unable to create nf_conntrack_hash\n");
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index 357ba39..3940f99 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -604,7 +604,7 @@ int nf_conntrack_expect_init(struct net *net)
net->ct.expect_count = 0;
net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize,
- &net->ct.expect_vmalloc);
+ &net->ct.expect_vmalloc, 0);
if (net->ct.expect_hash == NULL)
goto err1;
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index a51bdac..6066144 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -158,6 +158,7 @@ static void __nf_conntrack_helper_unregister(struct nf_conntrack_helper *me,
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_expect *exp;
const struct hlist_node *n, *next;
+ const struct hlist_nulls_node *nn;
unsigned int i;
/* Get rid of expectations */
@@ -174,10 +175,10 @@ static void __nf_conntrack_helper_unregister(struct nf_conntrack_helper *me,
}
/* Get rid of expecteds, set helpers to NULL. */
- hlist_for_each_entry(h, n, &net->ct.unconfirmed, hnode)
+ hlist_for_each_entry(h, nn, &net->ct.unconfirmed, hnnode)
unhelp(h, me);
for (i = 0; i < nf_conntrack_htable_size; i++) {
- hlist_for_each_entry(h, n, &net->ct.hash[i], hnode)
+ hlist_nulls_for_each_entry(h, nn, &net->ct.hash[i], hnnode)
unhelp(h, me);
}
}
@@ -217,7 +218,7 @@ int nf_conntrack_helper_init(void)
nf_ct_helper_hsize = 1; /* gets rounded up to use one page */
nf_ct_helper_hash = nf_ct_alloc_hashtable(&nf_ct_helper_hsize,
- &nf_ct_helper_vmalloc);
+ &nf_ct_helper_vmalloc, 0);
if (!nf_ct_helper_hash)
return -ENOMEM;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 1b75c9e..6520c94 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -19,6 +19,7 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/rculist.h>
+#include <linux/rculist_nulls.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
@@ -536,7 +537,7 @@ ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
{
struct nf_conn *ct, *last;
struct nf_conntrack_tuple_hash *h;
- struct hlist_node *n;
+ struct hlist_nulls_node *n;
struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
u_int8_t l3proto = nfmsg->nfgen_family;
@@ -544,8 +545,8 @@ ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
last = (struct nf_conn *)cb->args[1];
for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
restart:
- hlist_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
- hnode) {
+ hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
+ hnnode) {
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = nf_ct_tuplehash_to_ctrack(h);
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 4da54b0..f768368 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -44,30 +44,30 @@ struct ct_iter_state {
unsigned int bucket;
};
-static struct hlist_node *ct_get_first(struct seq_file *seq)
+static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
{
struct net *net = seq_file_net(seq);
struct ct_iter_state *st = seq->private;
- struct hlist_node *n;
+ struct hlist_nulls_node *n;
for (st->bucket = 0;
st->bucket < nf_conntrack_htable_size;
st->bucket++) {
n = rcu_dereference(net->ct.hash[st->bucket].first);
- if (n)
+ if (!is_a_nulls(n))
return n;
}
return NULL;
}
-static struct hlist_node *ct_get_next(struct seq_file *seq,
- struct hlist_node *head)
+static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
+ struct hlist_nulls_node *head)
{
struct net *net = seq_file_net(seq);
struct ct_iter_state *st = seq->private;
head = rcu_dereference(head->next);
- while (head == NULL) {
+ while (is_a_nulls(head)) {
if (++st->bucket >= nf_conntrack_htable_size)
return NULL;
head = rcu_dereference(net->ct.hash[st->bucket].first);
@@ -75,9 +75,9 @@ static struct hlist_node *ct_get_next(struct seq_file *seq,
return head;
}
-static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
+static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
{
- struct hlist_node *head = ct_get_first(seq);
+ struct hlist_nulls_node *head = ct_get_first(seq);
if (head)
while (pos && (head = ct_get_next(seq, head)))
--
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