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-rw-r--r--include/net/netfilter/nf_conntrack.h14
-rw-r--r--include/net/netfilter/nf_conntrack_tuple.h6
-rw-r--r--include/net/netns/conntrack.h5
-rw-r--r--net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c63
-rw-r--r--net/ipv4/netfilter/nf_nat_core.c2
-rw-r--r--net/netfilter/nf_conntrack_core.c123
-rw-r--r--net/netfilter/nf_conntrack_expect.c2
-rw-r--r--net/netfilter/nf_conntrack_helper.c7
-rw-r--r--net/netfilter/nf_conntrack_netlink.c20
-rw-r--r--net/netfilter/nf_conntrack_standalone.c57
-rw-r--r--net/netfilter/xt_connlimit.c6
11 files changed, 174 insertions, 131 deletions
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 4dfb793c3f15..6c3f964de9e1 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 f2f6aa73dc10..2628c154d40e 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 f4498a62881b..9dc58402bc09 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 6ba5c557690c..8668a3defda6 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -25,40 +25,42 @@ 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) {
- if (++st->bucket >= nf_conntrack_htable_size)
- return NULL;
+ while (is_a_nulls(head)) {
+ if (likely(get_nulls_value(head) == st->bucket)) {
+ if (++st->bucket >= nf_conntrack_htable_size)
+ return NULL;
+ }
head = rcu_dereference(net->ct.hash[st->bucket].first);
}
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)))
@@ -87,69 +89,76 @@ static void ct_seq_stop(struct seq_file *s, void *v)
static int ct_seq_show(struct seq_file *s, void *v)
{
- const struct nf_conntrack_tuple_hash *hash = v;
- const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
+ struct nf_conntrack_tuple_hash *hash = v;
+ struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
const struct nf_conntrack_l3proto *l3proto;
const struct nf_conntrack_l4proto *l4proto;
+ int ret = 0;
NF_CT_ASSERT(ct);
+ if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
+ return 0;
+
/* we only want to print DIR_ORIGINAL */
if (NF_CT_DIRECTION(hash))
- return 0;
+ goto release;
if (nf_ct_l3num(ct) != AF_INET)
- return 0;
+ goto release;
l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
NF_CT_ASSERT(l3proto);
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
NF_CT_ASSERT(l4proto);
+ ret = -ENOSPC;
if (seq_printf(s, "%-8s %u %ld ",
l4proto->name, nf_ct_protonum(ct),
timer_pending(&ct->timeout)
? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
- return -ENOSPC;
+ goto release;
if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
- return -ENOSPC;
+ goto release;
if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
l3proto, l4proto))
- return -ENOSPC;
+ goto release;
if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
- return -ENOSPC;
+ goto release;
if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
if (seq_printf(s, "[UNREPLIED] "))
- return -ENOSPC;
+ goto release;
if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
l3proto, l4proto))
- return -ENOSPC;
+ goto release;
if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
- return -ENOSPC;
+ goto release;
if (test_bit(IPS_ASSURED_BIT, &ct->status))
if (seq_printf(s, "[ASSURED] "))
- return -ENOSPC;
+ goto release;
#ifdef CONFIG_NF_CONNTRACK_MARK
if (seq_printf(s, "mark=%u ", ct->mark))
- return -ENOSPC;
+ goto release;
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
if (seq_printf(s, "secmark=%u ", ct->secmark))
- return -ENOSPC;
+ goto release;
#endif
if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
- return -ENOSPC;
-
- return 0;
+ goto release;
+ ret = 0;
+release:
+ nf_ct_put(ct);
+ return ret;
}
static const struct seq_operations ct_seq_ops = {
diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c
index a65cf692359f..fe65187810f0 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 54e983f13898..c55bbdc7d429 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_rcu(&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;
@@ -1202,7 +1219,7 @@ static int nf_conntrack_init_net(struct net *net)
int ret;
atomic_set(&net->ct.count, 0);
- INIT_HLIST_HEAD(&net->ct.unconfirmed);
+ INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, 0);
net->ct.stat = alloc_percpu(struct ip_conntrack_stat);
if (!net->ct.stat) {
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 357ba39d4c8d..3940f996a2e4 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 805cfdd42303..30b8e9009f99 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -159,6 +159,7 @@ 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 */
@@ -175,10 +176,10 @@ 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);
}
}
@@ -218,7 +219,7 @@ 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 1b75c9efb0eb..349bbefe5517 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;
@@ -544,27 +545,27 @@ 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);
+ if (!atomic_inc_not_zero(&ct->ct_general.use))
+ continue;
/* Dump entries of a given L3 protocol number.
* If it is not specified, ie. l3proto == 0,
* then dump everything. */
if (l3proto && nf_ct_l3num(ct) != l3proto)
- continue;
+ goto releasect;
if (cb->args[1]) {
if (ct != last)
- continue;
+ goto releasect;
cb->args[1] = 0;
}
if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
IPCTNL_MSG_CT_NEW,
1, ct) < 0) {
- if (!atomic_inc_not_zero(&ct->ct_general.use))
- continue;
cb->args[1] = (unsigned long)ct;
goto out;
}
@@ -577,6 +578,8 @@ restart:
if (acct)
memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
}
+releasect:
+ nf_ct_put(ct);
}
if (cb->args[1]) {
cb->args[1] = 0;
@@ -1242,13 +1245,12 @@ ctnetlink_create_conntrack(struct nlattr *cda[],
if (err < 0)
goto err2;
- master_h = __nf_conntrack_find(&init_net, &master);
+ master_h = nf_conntrack_find_get(&init_net, &master);
if (master_h == NULL) {
err = -ENOENT;
goto err2;
}
master_ct = nf_ct_tuplehash_to_ctrack(master_h);
- nf_conntrack_get(&master_ct->ct_general);
__set_bit(IPS_EXPECTED_BIT, &ct->status);
ct->master = master_ct;
}
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 4da54b0b9233..193515381970 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -44,40 +44,42 @@ 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) {
- if (++st->bucket >= nf_conntrack_htable_size)
- return NULL;
+ while (is_a_nulls(head)) {
+ if (likely(get_nulls_value(head) == st->bucket)) {
+ if (++st->bucket >= nf_conntrack_htable_size)
+ return NULL;
+ }
head = rcu_dereference(net->ct.hash[st->bucket].first);
}
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)))
@@ -107,67 +109,74 @@ static void ct_seq_stop(struct seq_file *s, void *v)
/* return 0 on success, 1 in case of error */
static int ct_seq_show(struct seq_file *s, void *v)
{
- const struct nf_conntrack_tuple_hash *hash = v;
- const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
+ struct nf_conntrack_tuple_hash *hash = v;
+ struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
const struct nf_conntrack_l3proto *l3proto;
const struct nf_conntrack_l4proto *l4proto;
+ int ret = 0;
NF_CT_ASSERT(ct);
+ if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
+ return 0;
/* we only want to print DIR_ORIGINAL */
if (NF_CT_DIRECTION(hash))
- return 0;
+ goto release;
l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
NF_CT_ASSERT(l3proto);
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
NF_CT_ASSERT(l4proto);
+ ret = -ENOSPC;
if (seq_printf(s, "%-8s %u %-8s %u %ld ",
l3proto->name, nf_ct_l3num(ct),
l4proto->name, nf_ct_protonum(ct),
timer_pending(&ct->timeout)
? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
- return -ENOSPC;
+ goto release;
if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
- return -ENOSPC;
+ goto release;
if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
l3proto, l4proto))
- return -ENOSPC;
+ goto release;
if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
- return -ENOSPC;
+ goto release;
if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
if (seq_printf(s, "[UNREPLIED] "))
- return -ENOSPC;
+ goto release;
if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
l3proto, l4proto))
- return -ENOSPC;
+ goto release;
if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
- return -ENOSPC;
+ goto release;
if (test_bit(IPS_ASSURED_BIT, &ct->status))
if (seq_printf(s, "[ASSURED] "))
- return -ENOSPC;
+ goto release;
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (seq_printf(s, "mark=%u ", ct->mark))
- return -ENOSPC;
+ goto release;
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
if (seq_printf(s, "secmark=%u ", ct->secmark))
- return -ENOSPC;
+ goto release;
#endif
if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
- return -ENOSPC;
+ goto release;
+ ret = 0;
+release:
+ nf_ct_put(ct);
return 0;
}
diff --git a/net/netfilter/xt_connlimit.c b/net/netfilter/xt_connlimit.c
index 7f404cc64c83..680980954395 100644
--- a/net/netfilter/xt_connlimit.c
+++ b/net/netfilter/xt_connlimit.c
@@ -108,7 +108,7 @@ static int count_them(struct xt_connlimit_data *data,
const struct nf_conntrack_tuple_hash *found;
struct xt_connlimit_conn *conn;
struct xt_connlimit_conn *tmp;
- const struct nf_conn *found_ct;
+ struct nf_conn *found_ct;
struct list_head *hash;
bool addit = true;
int matches = 0;
@@ -123,7 +123,7 @@ static int count_them(struct xt_connlimit_data *data,
/* check the saved connections */
list_for_each_entry_safe(conn, tmp, hash, list) {
- found = __nf_conntrack_find(&init_net, &conn->tuple);
+ found = nf_conntrack_find_get(&init_net, &conn->tuple);
found_ct = NULL;
if (found != NULL)
@@ -151,6 +151,7 @@ static int count_them(struct xt_connlimit_data *data,
* we do not care about connections which are
* closed already -> ditch it
*/
+ nf_ct_put(found_ct);
list_del(&conn->list);
kfree(conn);
continue;
@@ -160,6 +161,7 @@ static int count_them(struct xt_connlimit_data *data,
match->family))
/* same source network -> be counted! */
++matches;
+ nf_ct_put(found_ct);
}
rcu_read_unlock();
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.