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-rw-r--r--net/netfilter/nf_conntrack_core.c53
-rw-r--r--net/netfilter/nf_conntrack_expect.c2
-rw-r--r--net/netfilter/nf_conntrack_helper.c2
-rw-r--r--net/netfilter/nf_conntrack_netlink.c2
-rw-r--r--net/netfilter/nf_conntrack_standalone.c7
5 files changed, 35 insertions, 31 deletions
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 9de4bd4c0dd7..4d79e3c1616c 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -30,6 +30,7 @@
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <linux/mm.h>
+#include <linux/nsproxy.h>
#include <linux/rculist_nulls.h>
#include <net/netfilter/nf_conntrack.h>
@@ -84,9 +85,10 @@ static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple,
return ((u64)h * size) >> 32;
}
-static inline u_int32_t hash_conntrack(const struct nf_conntrack_tuple *tuple)
+static inline u_int32_t hash_conntrack(const struct net *net,
+ const struct nf_conntrack_tuple *tuple)
{
- return __hash_conntrack(tuple, nf_conntrack_htable_size,
+ return __hash_conntrack(tuple, net->ct.htable_size,
nf_conntrack_hash_rnd);
}
@@ -294,7 +296,7 @@ __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_node *n;
- unsigned int hash = hash_conntrack(tuple);
+ unsigned int hash = hash_conntrack(net, tuple);
/* Disable BHs the entire time since we normally need to disable them
* at least once for the stats anyway.
@@ -364,10 +366,11 @@ static void __nf_conntrack_hash_insert(struct nf_conn *ct,
void nf_conntrack_hash_insert(struct nf_conn *ct)
{
+ struct net *net = nf_ct_net(ct);
unsigned int hash, repl_hash;
- hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
- repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+ hash = hash_conntrack(net, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+ repl_hash = hash_conntrack(net, &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
__nf_conntrack_hash_insert(ct, hash, repl_hash);
}
@@ -395,8 +398,8 @@ __nf_conntrack_confirm(struct sk_buff *skb)
if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
return NF_ACCEPT;
- hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
- repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+ hash = hash_conntrack(net, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+ repl_hash = hash_conntrack(net, &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
/* We're not in hash table, and we refuse to set up related
connections for unconfirmed conns. But packet copies and
@@ -466,7 +469,7 @@ 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_nulls_node *n;
- unsigned int hash = hash_conntrack(tuple);
+ unsigned int hash = hash_conntrack(net, tuple);
/* Disable BHs the entire time since we need to disable them at
* least once for the stats anyway.
@@ -501,7 +504,7 @@ static noinline int early_drop(struct net *net, unsigned int hash)
int dropped = 0;
rcu_read_lock();
- for (i = 0; i < nf_conntrack_htable_size; i++) {
+ for (i = 0; i < net->ct.htable_size; i++) {
hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash],
hnnode) {
tmp = nf_ct_tuplehash_to_ctrack(h);
@@ -521,7 +524,7 @@ static noinline int early_drop(struct net *net, unsigned int hash)
if (cnt >= NF_CT_EVICTION_RANGE)
break;
- hash = (hash + 1) % nf_conntrack_htable_size;
+ hash = (hash + 1) % net->ct.htable_size;
}
rcu_read_unlock();
@@ -555,7 +558,7 @@ struct nf_conn *nf_conntrack_alloc(struct net *net,
if (nf_conntrack_max &&
unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) {
- unsigned int hash = hash_conntrack(orig);
+ unsigned int hash = hash_conntrack(net, orig);
if (!early_drop(net, hash)) {
atomic_dec(&net->ct.count);
if (net_ratelimit())
@@ -1012,7 +1015,7 @@ get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data),
struct hlist_nulls_node *n;
spin_lock_bh(&nf_conntrack_lock);
- for (; *bucket < nf_conntrack_htable_size; (*bucket)++) {
+ for (; *bucket < net->ct.htable_size; (*bucket)++) {
hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (iter(ct, data))
@@ -1130,7 +1133,7 @@ static void nf_conntrack_cleanup_net(struct net *net)
}
nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc,
- nf_conntrack_htable_size);
+ net->ct.htable_size);
nf_conntrack_ecache_fini(net);
nf_conntrack_acct_fini(net);
nf_conntrack_expect_fini(net);
@@ -1190,10 +1193,12 @@ 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_nulls_head *hash, *old_hash;
struct nf_conntrack_tuple_hash *h;
+ if (current->nsproxy->net_ns != &init_net)
+ return -EOPNOTSUPP;
+
/* On boot, we can set this without any fancy locking. */
if (!nf_conntrack_htable_size)
return param_set_uint(val, kp);
@@ -1206,33 +1211,29 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
if (!hash)
return -ENOMEM;
- /* We have to rehahs for the new table anyway, so we also can
- * use a newrandom seed */
- get_random_bytes(&rnd, sizeof(rnd));
-
/* Lookups in the old hash might happen in parallel, which means we
* might get false negatives during connection lookup. New connections
* created because of a false negative won't make it into the hash
* though since that required taking the lock.
*/
spin_lock_bh(&nf_conntrack_lock);
- for (i = 0; i < nf_conntrack_htable_size; i++) {
+ for (i = 0; i < init_net.ct.htable_size; i++) {
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);
+ bucket = __hash_conntrack(&h->tuple, hashsize,
+ nf_conntrack_hash_rnd);
hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]);
}
}
- old_size = nf_conntrack_htable_size;
+ old_size = init_net.ct.htable_size;
old_vmalloced = init_net.ct.hash_vmalloc;
old_hash = init_net.ct.hash;
- nf_conntrack_htable_size = hashsize;
+ init_net.ct.htable_size = nf_conntrack_htable_size = hashsize;
init_net.ct.hash_vmalloc = vmalloced;
init_net.ct.hash = hash;
- nf_conntrack_hash_rnd = rnd;
spin_unlock_bh(&nf_conntrack_lock);
nf_ct_free_hashtable(old_hash, old_vmalloced, old_size);
@@ -1328,7 +1329,9 @@ static int nf_conntrack_init_net(struct net *net)
ret = -ENOMEM;
goto err_cache;
}
- net->ct.hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size,
+
+ net->ct.htable_size = nf_conntrack_htable_size;
+ net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size,
&net->ct.hash_vmalloc, 1);
if (!net->ct.hash) {
ret = -ENOMEM;
@@ -1353,7 +1356,7 @@ err_acct:
nf_conntrack_expect_fini(net);
err_expect:
nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc,
- nf_conntrack_htable_size);
+ net->ct.htable_size);
err_hash:
kmem_cache_destroy(net->ct.nf_conntrack_cachep);
err_cache:
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index 4ad7d1d809af..2f25ff610982 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -577,7 +577,7 @@ int nf_conntrack_expect_init(struct net *net)
if (net_eq(net, &init_net)) {
if (!nf_ct_expect_hsize) {
- nf_ct_expect_hsize = nf_conntrack_htable_size / 256;
+ nf_ct_expect_hsize = net->ct.htable_size / 256;
if (!nf_ct_expect_hsize)
nf_ct_expect_hsize = 1;
}
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 65c2a7bc3afc..4b1a56bd074c 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -192,7 +192,7 @@ static void __nf_conntrack_helper_unregister(struct nf_conntrack_helper *me,
/* Get rid of expecteds, set helpers to NULL. */
hlist_nulls_for_each_entry(h, nn, &net->ct.unconfirmed, hnnode)
unhelp(h, me);
- for (i = 0; i < nf_conntrack_htable_size; i++) {
+ for (i = 0; i < net->ct.htable_size; i++) {
hlist_nulls_for_each_entry(h, nn, &net->ct.hash[i], hnnode)
unhelp(h, me);
}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 42f21c01a93e..0ffe689dfe97 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -594,7 +594,7 @@ ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
rcu_read_lock();
last = (struct nf_conn *)cb->args[1];
- for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
+ for (; cb->args[0] < init_net.ct.htable_size; cb->args[0]++) {
restart:
hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
hnnode) {
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 028aba667ef7..e310f1561bb2 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -51,7 +51,7 @@ static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
struct hlist_nulls_node *n;
for (st->bucket = 0;
- st->bucket < nf_conntrack_htable_size;
+ st->bucket < net->ct.htable_size;
st->bucket++) {
n = rcu_dereference(net->ct.hash[st->bucket].first);
if (!is_a_nulls(n))
@@ -69,7 +69,7 @@ static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
head = rcu_dereference(head->next);
while (is_a_nulls(head)) {
if (likely(get_nulls_value(head) == st->bucket)) {
- if (++st->bucket >= nf_conntrack_htable_size)
+ if (++st->bucket >= net->ct.htable_size)
return NULL;
}
head = rcu_dereference(net->ct.hash[st->bucket].first);
@@ -355,7 +355,7 @@ static ctl_table nf_ct_sysctl_table[] = {
},
{
.procname = "nf_conntrack_buckets",
- .data = &nf_conntrack_htable_size,
+ .data = &init_net.ct.htable_size,
.maxlen = sizeof(unsigned int),
.mode = 0444,
.proc_handler = proc_dointvec,
@@ -421,6 +421,7 @@ static int nf_conntrack_standalone_init_sysctl(struct net *net)
goto out_kmemdup;
table[1].data = &net->ct.count;
+ table[2].data = &net->ct.htable_size;
table[3].data = &net->ct.sysctl_checksum;
table[4].data = &net->ct.sysctl_log_invalid;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.