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Message-Id: <20241014111420.29127-8-pablo@netfilter.org>
Date: Mon, 14 Oct 2024 13:14:18 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net,
netdev@...r.kernel.org,
kuba@...nel.org,
pabeni@...hat.com,
edumazet@...gle.com,
fw@...len.de
Subject: [PATCH net-next 7/9] netfilter: nf_tables: allocate element update information dynamically
From: Florian Westphal <fw@...len.de>
Move the timeout/expire/flag members from nft_trans_one_elem struct into
a dybamically allocated structure, only needed when timeout update was
requested.
This halves size of nft_trans_one_elem struct and allows to compact up to
124 elements in one transaction container rather than 62.
This halves memory requirements for a large flush or insert transaction,
where ->update remains NULL.
Care has to be taken to release the extra data in all spots, including
abort path.
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_tables.h | 10 +++--
net/netfilter/nf_tables_api.c | 61 ++++++++++++++++++++-----------
2 files changed, 46 insertions(+), 25 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 2a2631edab2b..1caf142900fe 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1754,11 +1754,15 @@ enum nft_trans_elem_flags {
NFT_TRANS_UPD_EXPIRATION = (1 << 1),
};
-struct nft_trans_one_elem {
- struct nft_elem_priv *priv;
+struct nft_elem_update {
u64 timeout;
u64 expiration;
- u8 update_flags;
+ u8 flags;
+};
+
+struct nft_trans_one_elem {
+ struct nft_elem_priv *priv;
+ struct nft_elem_update *update;
};
struct nft_trans_elem {
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index aa2e7c91f0cb..91a7b13b49ae 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6665,7 +6665,8 @@ static void nft_trans_set_elem_destroy(const struct nft_ctx *ctx, struct nft_tra
int i;
for (i = 0; i < te->nelems; i++) {
- if (te->elems[i].update_flags)
+ /* skip update request, see nft_trans_elems_new_abort() */
+ if (!te->elems[i].priv)
continue;
__nft_set_elem_destroy(ctx, te->set, te->elems[i].priv, true);
@@ -6856,24 +6857,28 @@ static void nft_trans_elem_update(const struct nft_set *set,
const struct nft_trans_one_elem *elem)
{
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
+ const struct nft_elem_update *update = elem->update;
- if (elem->update_flags & NFT_TRANS_UPD_TIMEOUT)
- WRITE_ONCE(nft_set_ext_timeout(ext)->timeout, elem->timeout);
+ if (update->flags & NFT_TRANS_UPD_TIMEOUT)
+ WRITE_ONCE(nft_set_ext_timeout(ext)->timeout, update->timeout);
- if (elem->update_flags & NFT_TRANS_UPD_EXPIRATION)
- WRITE_ONCE(nft_set_ext_timeout(ext)->expiration, get_jiffies_64() + elem->expiration);
+ if (update->flags & NFT_TRANS_UPD_EXPIRATION)
+ WRITE_ONCE(nft_set_ext_timeout(ext)->expiration, get_jiffies_64() + update->expiration);
}
static void nft_trans_elems_activate(const struct nft_ctx *ctx,
- const struct nft_trans_elem *te)
+ struct nft_trans_elem *te)
{
int i;
for (i = 0; i < te->nelems; i++) {
- const struct nft_trans_one_elem *elem = &te->elems[i];
+ struct nft_trans_one_elem *elem = &te->elems[i];
- if (elem->update_flags) {
+ if (elem->update) {
nft_trans_elem_update(te->set, elem);
+ kfree(elem->update);
+ elem->update = NULL;
+ elem->priv = NULL;
continue;
}
@@ -6971,6 +6976,8 @@ static void nft_trans_elems_remove(const struct nft_ctx *ctx,
int i;
for (i = 0; i < te->nelems; i++) {
+ WARN_ON_ONCE(te->elems[i].update);
+
nf_tables_setelem_notify(ctx, te->set,
te->elems[i].priv,
te->nft_trans.msg_type);
@@ -7019,7 +7026,6 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
struct nft_data_desc desc;
enum nft_registers dreg;
struct nft_trans *trans;
- u8 update_flags;
u64 expiration;
u64 timeout;
int err, i;
@@ -7334,26 +7340,32 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
else if (!(nlmsg_flags & NLM_F_EXCL)) {
err = 0;
if (nft_set_ext_exists(ext2, NFT_SET_EXT_TIMEOUT)) {
- struct nft_trans_one_elem *update;
-
- update = &nft_trans_container_elem(trans)->elems[0];
+ struct nft_elem_update update = { };
- update_flags = 0;
if (timeout != nft_set_ext_timeout(ext2)->timeout) {
- update->timeout = timeout;
+ update.timeout = timeout;
if (expiration == 0)
expiration = timeout;
- update_flags |= NFT_TRANS_UPD_TIMEOUT;
+ update.flags |= NFT_TRANS_UPD_TIMEOUT;
}
if (expiration) {
- update->expiration = expiration;
- update_flags |= NFT_TRANS_UPD_EXPIRATION;
+ update.expiration = expiration;
+ update.flags |= NFT_TRANS_UPD_EXPIRATION;
}
- if (update_flags) {
- update->priv = elem_priv;
- update->update_flags = update_flags;
+ if (update.flags) {
+ struct nft_trans_one_elem *ue;
+
+ ue = &nft_trans_container_elem(trans)->elems[0];
+
+ ue->update = kmemdup(&update, sizeof(update), GFP_KERNEL);
+ if (!ue->update) {
+ err = -ENOMEM;
+ goto err_element_clash;
+ }
+
+ ue->priv = elem_priv;
nft_trans_commit_list_add_elem(ctx->net, trans, GFP_KERNEL);
goto err_elem_free;
}
@@ -7521,14 +7533,19 @@ void nft_setelem_data_deactivate(const struct net *net,
* Returns true if set had been added to (i.e., elements need to be removed again).
*/
static bool nft_trans_elems_new_abort(const struct nft_ctx *ctx,
- const struct nft_trans_elem *te)
+ struct nft_trans_elem *te)
{
bool removed = false;
int i;
for (i = 0; i < te->nelems; i++) {
- if (te->elems[i].update_flags)
+ if (te->elems[i].update) {
+ kfree(te->elems[i].update);
+ te->elems[i].update = NULL;
+ /* Update request, so do not release this element */
+ te->elems[i].priv = NULL;
continue;
+ }
if (!te->set->ops->abort || nft_setelem_is_catchall(te->set, te->elems[i].priv))
nft_setelem_remove(ctx->net, te->set, te->elems[i].priv);
--
2.30.2
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