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authorFlorian Westphal <fw@strlen.de>2017-04-20 09:54:22 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2017-04-26 09:30:22 +0200
commit54044b1f0204da158a6a395bd02b63bb02ffff98 (patch)
tree253f70f735091ea2e9490f1c93e58d6e05fc0ed3 /net/netfilter
parent495dcb56d09ddb63afe30e799af41876c3f061cc (diff)
netfilter: conntrack: remove prealloc support
It was used by the nat extension, but since commit 7c9664351980 ("netfilter: move nat hlist_head to nf_conn") its only needed for connections that use MASQUERADE target or a nat helper. Also it seems a lot easier to preallocate a fixed size instead. With default settings, conntrack first adds ecache extension (sysctl defaults to 1), so we get 40(ct extension header) + 24 (ecache) == 64 byte on x86_64 for initial allocation. Followup patches can constify the extension structs and avoid the initial zeroing of the entire extension area. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nf_conntrack_extend.c49
-rw-r--r--net/netfilter/nf_nat_core.c1
2 files changed, 4 insertions, 46 deletions
diff --git a/net/netfilter/nf_conntrack_extend.c b/net/netfilter/nf_conntrack_extend.c
index b5879a9c748d..2e4b41bc67a0 100644
--- a/net/netfilter/nf_conntrack_extend.c
+++ b/net/netfilter/nf_conntrack_extend.c
@@ -18,6 +18,7 @@
static struct nf_ct_ext_type __rcu *nf_ct_ext_types[NF_CT_EXT_NUM];
static DEFINE_MUTEX(nf_ct_ext_type_mutex);
+#define NF_CT_EXT_PREALLOC 128u /* conntrack events are on by default */
void __nf_ct_ext_destroy(struct nf_conn *ct)
{
@@ -46,9 +47,8 @@ EXPORT_SYMBOL(__nf_ct_ext_destroy);
static void *
nf_ct_ext_create(struct nf_ct_ext **ext, enum nf_ct_ext_id id, gfp_t gfp)
{
- unsigned int off, len;
+ unsigned int off, len, alloc;
struct nf_ct_ext_type *t;
- size_t alloc_size;
rcu_read_lock();
t = rcu_dereference(nf_ct_ext_types[id]);
@@ -59,10 +59,10 @@ nf_ct_ext_create(struct nf_ct_ext **ext, enum nf_ct_ext_id id, gfp_t gfp)
off = ALIGN(sizeof(struct nf_ct_ext), t->align);
len = off + t->len;
- alloc_size = t->alloc_size;
rcu_read_unlock();
- *ext = kzalloc(alloc_size, gfp);
+ alloc = max(len, NF_CT_EXT_PREALLOC);
+ *ext = kzalloc(alloc, gfp);
if (!*ext)
return NULL;
@@ -115,41 +115,6 @@ void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp)
}
EXPORT_SYMBOL(nf_ct_ext_add);
-static void update_alloc_size(struct nf_ct_ext_type *type)
-{
- int i, j;
- struct nf_ct_ext_type *t1, *t2;
- enum nf_ct_ext_id min = 0, max = NF_CT_EXT_NUM - 1;
-
- /* unnecessary to update all types */
- if ((type->flags & NF_CT_EXT_F_PREALLOC) == 0) {
- min = type->id;
- max = type->id;
- }
-
- /* This assumes that extended areas in conntrack for the types
- whose NF_CT_EXT_F_PREALLOC bit set are allocated in order */
- for (i = min; i <= max; i++) {
- t1 = rcu_dereference_protected(nf_ct_ext_types[i],
- lockdep_is_held(&nf_ct_ext_type_mutex));
- if (!t1)
- continue;
-
- t1->alloc_size = ALIGN(sizeof(struct nf_ct_ext), t1->align) +
- t1->len;
- for (j = 0; j < NF_CT_EXT_NUM; j++) {
- t2 = rcu_dereference_protected(nf_ct_ext_types[j],
- lockdep_is_held(&nf_ct_ext_type_mutex));
- if (t2 == NULL || t2 == t1 ||
- (t2->flags & NF_CT_EXT_F_PREALLOC) == 0)
- continue;
-
- t1->alloc_size = ALIGN(t1->alloc_size, t2->align)
- + t2->len;
- }
- }
-}
-
/* This MUST be called in process context. */
int nf_ct_extend_register(struct nf_ct_ext_type *type)
{
@@ -161,12 +126,7 @@ int nf_ct_extend_register(struct nf_ct_ext_type *type)
goto out;
}
- /* This ensures that nf_ct_ext_create() can allocate enough area
- before updating alloc_size */
- type->alloc_size = ALIGN(sizeof(struct nf_ct_ext), type->align)
- + type->len;
rcu_assign_pointer(nf_ct_ext_types[type->id], type);
- update_alloc_size(type);
out:
mutex_unlock(&nf_ct_ext_type_mutex);
return ret;
@@ -178,7 +138,6 @@ void nf_ct_extend_unregister(struct nf_ct_ext_type *type)
{
mutex_lock(&nf_ct_ext_type_mutex);
RCU_INIT_POINTER(nf_ct_ext_types[type->id], NULL);
- update_alloc_size(type);
mutex_unlock(&nf_ct_ext_type_mutex);
synchronize_rcu();
}
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 9cbf49f9c1b7..86eeacbb4793 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -717,7 +717,6 @@ static struct nf_ct_ext_type nat_extend __read_mostly = {
.align = __alignof__(struct nf_conn_nat),
.destroy = nf_nat_cleanup_conntrack,
.id = NF_CT_EXT_NAT,
- .flags = NF_CT_EXT_F_PREALLOC,
};
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)