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Message-Id: <20240512161436.168973-18-pablo@netfilter.org>
Date: Sun, 12 May 2024 18:14:36 +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 17/17] netfilter: nf_tables: allow clone callbacks to sleep
From: Florian Westphal <fw@...len.de>
Sven Auhagen reports transaction failures with following error:
./main.nft:13:1-26: Error: Could not process rule: Cannot allocate memory
percpu: allocation failed, size=16 align=8 atomic=1, atomic alloc failed, no space left
This points to failing pcpu allocation with GFP_ATOMIC flag.
However, transactions happen from user context and are allowed to sleep.
One case where we can call into percpu allocator with GFP_ATOMIC is
nft_counter expression.
Normally this happens from control plane, so this could use GFP_KERNEL
instead. But one use case, element insertion from packet path,
needs to use GFP_ATOMIC allocations (nft_dynset expression).
At this time, .clone callbacks always use GFP_ATOMIC for this reason.
Add gfp_t argument to the .clone function and pass GFP_KERNEL or
GFP_ATOMIC flag depending on context, this allows all clone memory
allocations to sleep for the normal (transaction) case.
Cc: Sven Auhagen <sven.auhagen@...eatech.de>
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_tables.h | 4 ++--
net/netfilter/nf_tables_api.c | 8 ++++----
net/netfilter/nft_connlimit.c | 4 ++--
net/netfilter/nft_counter.c | 4 ++--
net/netfilter/nft_dynset.c | 2 +-
net/netfilter/nft_last.c | 4 ++--
net/netfilter/nft_limit.c | 14 ++++++++------
net/netfilter/nft_quota.c | 4 ++--
8 files changed, 23 insertions(+), 21 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 3f1ed467f951..2796153b03da 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -416,7 +416,7 @@ struct nft_expr_info;
int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
struct nft_expr_info *info);
-int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src);
+int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp);
void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
const struct nft_expr *expr, bool reset);
@@ -935,7 +935,7 @@ struct nft_expr_ops {
struct nft_regs *regs,
const struct nft_pktinfo *pkt);
int (*clone)(struct nft_expr *dst,
- const struct nft_expr *src);
+ const struct nft_expr *src, gfp_t gfp);
unsigned int size;
int (*init)(const struct nft_ctx *ctx,
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index a7f54eb68d9a..be3b4c90d2ed 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3333,7 +3333,7 @@ static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
return ERR_PTR(err);
}
-int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
+int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp)
{
int err;
@@ -3341,7 +3341,7 @@ int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
return -EINVAL;
dst->ops = src->ops;
- err = src->ops->clone(dst, src);
+ err = src->ops->clone(dst, src, gfp);
if (err < 0)
return err;
@@ -6525,7 +6525,7 @@ int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
if (!expr)
goto err_expr;
- err = nft_expr_clone(expr, set->exprs[i]);
+ err = nft_expr_clone(expr, set->exprs[i], GFP_KERNEL_ACCOUNT);
if (err < 0) {
kfree(expr);
goto err_expr;
@@ -6564,7 +6564,7 @@ static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
for (i = 0; i < num_exprs; i++) {
expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
- err = nft_expr_clone(expr, expr_array[i]);
+ err = nft_expr_clone(expr, expr_array[i], GFP_KERNEL_ACCOUNT);
if (err < 0)
goto err_elem_expr_setup;
diff --git a/net/netfilter/nft_connlimit.c b/net/netfilter/nft_connlimit.c
index de9d1980df69..92b984fa8175 100644
--- a/net/netfilter/nft_connlimit.c
+++ b/net/netfilter/nft_connlimit.c
@@ -210,12 +210,12 @@ static void nft_connlimit_destroy(const struct nft_ctx *ctx,
nft_connlimit_do_destroy(ctx, priv);
}
-static int nft_connlimit_clone(struct nft_expr *dst, const struct nft_expr *src)
+static int nft_connlimit_clone(struct nft_expr *dst, const struct nft_expr *src, gfp_t gfp)
{
struct nft_connlimit *priv_dst = nft_expr_priv(dst);
struct nft_connlimit *priv_src = nft_expr_priv(src);
- priv_dst->list = kmalloc(sizeof(*priv_dst->list), GFP_ATOMIC);
+ priv_dst->list = kmalloc(sizeof(*priv_dst->list), gfp);
if (!priv_dst->list)
return -ENOMEM;
diff --git a/net/netfilter/nft_counter.c b/net/netfilter/nft_counter.c
index dccc68a5135a..291ed2026367 100644
--- a/net/netfilter/nft_counter.c
+++ b/net/netfilter/nft_counter.c
@@ -226,7 +226,7 @@ static void nft_counter_destroy(const struct nft_ctx *ctx,
nft_counter_do_destroy(priv);
}
-static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src)
+static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src, gfp_t gfp)
{
struct nft_counter_percpu_priv *priv = nft_expr_priv(src);
struct nft_counter_percpu_priv *priv_clone = nft_expr_priv(dst);
@@ -236,7 +236,7 @@ static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src)
nft_counter_fetch(priv, &total);
- cpu_stats = alloc_percpu_gfp(struct nft_counter, GFP_ATOMIC);
+ cpu_stats = alloc_percpu_gfp(struct nft_counter, gfp);
if (cpu_stats == NULL)
return -ENOMEM;
diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c
index c09dba57354c..b4ada3ab2167 100644
--- a/net/netfilter/nft_dynset.c
+++ b/net/netfilter/nft_dynset.c
@@ -35,7 +35,7 @@ static int nft_dynset_expr_setup(const struct nft_dynset *priv,
for (i = 0; i < priv->num_exprs; i++) {
expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
- if (nft_expr_clone(expr, priv->expr_array[i]) < 0)
+ if (nft_expr_clone(expr, priv->expr_array[i], GFP_ATOMIC) < 0)
return -1;
elem_expr->size += priv->expr_array[i]->ops->size;
diff --git a/net/netfilter/nft_last.c b/net/netfilter/nft_last.c
index 8e6d7eaf9dc8..de1b6066bfa8 100644
--- a/net/netfilter/nft_last.c
+++ b/net/netfilter/nft_last.c
@@ -102,12 +102,12 @@ static void nft_last_destroy(const struct nft_ctx *ctx,
kfree(priv->last);
}
-static int nft_last_clone(struct nft_expr *dst, const struct nft_expr *src)
+static int nft_last_clone(struct nft_expr *dst, const struct nft_expr *src, gfp_t gfp)
{
struct nft_last_priv *priv_dst = nft_expr_priv(dst);
struct nft_last_priv *priv_src = nft_expr_priv(src);
- priv_dst->last = kzalloc(sizeof(*priv_dst->last), GFP_ATOMIC);
+ priv_dst->last = kzalloc(sizeof(*priv_dst->last), gfp);
if (!priv_dst->last)
return -ENOMEM;
diff --git a/net/netfilter/nft_limit.c b/net/netfilter/nft_limit.c
index cefa25e0dbb0..21d26b79b460 100644
--- a/net/netfilter/nft_limit.c
+++ b/net/netfilter/nft_limit.c
@@ -150,7 +150,7 @@ static void nft_limit_destroy(const struct nft_ctx *ctx,
}
static int nft_limit_clone(struct nft_limit_priv *priv_dst,
- const struct nft_limit_priv *priv_src)
+ const struct nft_limit_priv *priv_src, gfp_t gfp)
{
priv_dst->tokens_max = priv_src->tokens_max;
priv_dst->rate = priv_src->rate;
@@ -158,7 +158,7 @@ static int nft_limit_clone(struct nft_limit_priv *priv_dst,
priv_dst->burst = priv_src->burst;
priv_dst->invert = priv_src->invert;
- priv_dst->limit = kmalloc(sizeof(*priv_dst->limit), GFP_ATOMIC);
+ priv_dst->limit = kmalloc(sizeof(*priv_dst->limit), gfp);
if (!priv_dst->limit)
return -ENOMEM;
@@ -223,14 +223,15 @@ static void nft_limit_pkts_destroy(const struct nft_ctx *ctx,
nft_limit_destroy(ctx, &priv->limit);
}
-static int nft_limit_pkts_clone(struct nft_expr *dst, const struct nft_expr *src)
+static int nft_limit_pkts_clone(struct nft_expr *dst, const struct nft_expr *src,
+ gfp_t gfp)
{
struct nft_limit_priv_pkts *priv_dst = nft_expr_priv(dst);
struct nft_limit_priv_pkts *priv_src = nft_expr_priv(src);
priv_dst->cost = priv_src->cost;
- return nft_limit_clone(&priv_dst->limit, &priv_src->limit);
+ return nft_limit_clone(&priv_dst->limit, &priv_src->limit, gfp);
}
static struct nft_expr_type nft_limit_type;
@@ -281,12 +282,13 @@ static void nft_limit_bytes_destroy(const struct nft_ctx *ctx,
nft_limit_destroy(ctx, priv);
}
-static int nft_limit_bytes_clone(struct nft_expr *dst, const struct nft_expr *src)
+static int nft_limit_bytes_clone(struct nft_expr *dst, const struct nft_expr *src,
+ gfp_t gfp)
{
struct nft_limit_priv *priv_dst = nft_expr_priv(dst);
struct nft_limit_priv *priv_src = nft_expr_priv(src);
- return nft_limit_clone(priv_dst, priv_src);
+ return nft_limit_clone(priv_dst, priv_src, gfp);
}
static const struct nft_expr_ops nft_limit_bytes_ops = {
diff --git a/net/netfilter/nft_quota.c b/net/netfilter/nft_quota.c
index 3ba12a7471b0..9b2d7463d3d3 100644
--- a/net/netfilter/nft_quota.c
+++ b/net/netfilter/nft_quota.c
@@ -233,7 +233,7 @@ static void nft_quota_destroy(const struct nft_ctx *ctx,
return nft_quota_do_destroy(ctx, priv);
}
-static int nft_quota_clone(struct nft_expr *dst, const struct nft_expr *src)
+static int nft_quota_clone(struct nft_expr *dst, const struct nft_expr *src, gfp_t gfp)
{
struct nft_quota *priv_dst = nft_expr_priv(dst);
struct nft_quota *priv_src = nft_expr_priv(src);
@@ -241,7 +241,7 @@ static int nft_quota_clone(struct nft_expr *dst, const struct nft_expr *src)
priv_dst->quota = priv_src->quota;
priv_dst->flags = priv_src->flags;
- priv_dst->consumed = kmalloc(sizeof(*priv_dst->consumed), GFP_ATOMIC);
+ priv_dst->consumed = kmalloc(sizeof(*priv_dst->consumed), gfp);
if (!priv_dst->consumed)
return -ENOMEM;
--
2.30.2
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