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Message-Id: <20211217113837.1253-5-pablo@netfilter.org>
Date: Fri, 17 Dec 2021 12:38:37 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH nf-next,v2 5/5] netfilter: nf_tables: make counter support built-in
Make counter support built-in to allow for direct call in case of
CONFIG_RETPOLINE.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
v2: add nft_counter_init_seqcount() and call it from core.
include/net/netfilter/nf_tables_core.h | 6 +++
net/netfilter/Kconfig | 6 ---
net/netfilter/Makefile | 3 +-
net/netfilter/nf_tables_core.c | 5 +++
net/netfilter/nft_counter.c | 57 +++++++-------------------
5 files changed, 26 insertions(+), 51 deletions(-)
diff --git a/include/net/netfilter/nf_tables_core.h b/include/net/netfilter/nf_tables_core.h
index 0fa5a6d98a00..b6fb1fdff9b2 100644
--- a/include/net/netfilter/nf_tables_core.h
+++ b/include/net/netfilter/nf_tables_core.h
@@ -7,6 +7,7 @@
extern struct nft_expr_type nft_imm_type;
extern struct nft_expr_type nft_cmp_type;
+extern struct nft_expr_type nft_counter_type;
extern struct nft_expr_type nft_lookup_type;
extern struct nft_expr_type nft_bitwise_type;
extern struct nft_expr_type nft_byteorder_type;
@@ -21,6 +22,7 @@ extern struct nft_expr_type nft_last_type;
#ifdef CONFIG_NETWORK_SECMARK
extern struct nft_object_type nft_secmark_obj_type;
#endif
+extern struct nft_object_type nft_counter_obj_type;
int nf_tables_core_module_init(void);
void nf_tables_core_module_exit(void);
@@ -120,6 +122,8 @@ bool nft_pipapo_lookup(const struct net *net, const struct nft_set *set,
bool nft_pipapo_avx2_lookup(const struct net *net, const struct nft_set *set,
const u32 *key, const struct nft_set_ext **ext);
+void nft_counter_init_seqcount(void);
+
struct nft_expr;
struct nft_regs;
struct nft_pktinfo;
@@ -143,4 +147,6 @@ void nft_dynset_eval(const struct nft_expr *expr,
struct nft_regs *regs, const struct nft_pktinfo *pkt);
void nft_rt_get_eval(const struct nft_expr *expr,
struct nft_regs *regs, const struct nft_pktinfo *pkt);
+void nft_counter_eval(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt);
#endif /* _NET_NF_TABLES_CORE_H */
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 3646fc195e7d..ddc54b6d18ee 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -515,12 +515,6 @@ config NFT_FLOW_OFFLOAD
This option adds the "flow_offload" expression that you can use to
choose what flows are placed into the hardware.
-config NFT_COUNTER
- tristate "Netfilter nf_tables counter module"
- help
- This option adds the "counter" expression that you can use to
- include packet and byte counters in a rule.
-
config NFT_CONNLIMIT
tristate "Netfilter nf_tables connlimit module"
depends on NF_CONNTRACK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index aab20e575ecd..a135b1a46014 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -75,7 +75,7 @@ nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \
nf_tables_trace.o nft_immediate.o nft_cmp.o nft_range.o \
nft_bitwise.o nft_byteorder.o nft_payload.o nft_lookup.o \
nft_dynset.o nft_meta.o nft_rt.o nft_exthdr.o nft_last.o \
- nft_chain_route.o nf_tables_offload.o \
+ nft_counter.o nft_chain_route.o nf_tables_offload.o \
nft_set_hash.o nft_set_bitmap.o nft_set_rbtree.o \
nft_set_pipapo.o
@@ -100,7 +100,6 @@ obj-$(CONFIG_NFT_REJECT) += nft_reject.o
obj-$(CONFIG_NFT_REJECT_INET) += nft_reject_inet.o
obj-$(CONFIG_NFT_REJECT_NETDEV) += nft_reject_netdev.o
obj-$(CONFIG_NFT_TUNNEL) += nft_tunnel.o
-obj-$(CONFIG_NFT_COUNTER) += nft_counter.o
obj-$(CONFIG_NFT_LOG) += nft_log.o
obj-$(CONFIG_NFT_MASQ) += nft_masq.o
obj-$(CONFIG_NFT_REDIR) += nft_redir.o
diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index d2ada666d889..df5eda7c7554 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -169,6 +169,7 @@ static void expr_call_ops_eval(const struct nft_expr *expr,
X(e, nft_payload_eval);
X(e, nft_cmp_eval);
+ X(e, nft_counter_eval);
X(e, nft_meta_get_eval);
X(e, nft_lookup_eval);
X(e, nft_range_eval);
@@ -292,18 +293,22 @@ static struct nft_expr_type *nft_basic_types[] = {
&nft_rt_type,
&nft_exthdr_type,
&nft_last_type,
+ &nft_counter_type,
};
static struct nft_object_type *nft_basic_objects[] = {
#ifdef CONFIG_NETWORK_SECMARK
&nft_secmark_obj_type,
#endif
+ &nft_counter_obj_type,
};
int __init nf_tables_core_module_init(void)
{
int err, i, j = 0;
+ nft_counter_init_seqcount();
+
for (i = 0; i < ARRAY_SIZE(nft_basic_objects); i++) {
err = nft_register_obj(nft_basic_objects[i]);
if (err)
diff --git a/net/netfilter/nft_counter.c b/net/netfilter/nft_counter.c
index 8edd3b3c173d..83f1c7bd4bb3 100644
--- a/net/netfilter/nft_counter.c
+++ b/net/netfilter/nft_counter.c
@@ -174,7 +174,7 @@ static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
[NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
};
-static struct nft_object_type nft_counter_obj_type;
+struct nft_object_type nft_counter_obj_type;
static const struct nft_object_ops nft_counter_obj_ops = {
.type = &nft_counter_obj_type,
.size = sizeof(struct nft_counter_percpu_priv),
@@ -184,7 +184,7 @@ static const struct nft_object_ops nft_counter_obj_ops = {
.dump = nft_counter_obj_dump,
};
-static struct nft_object_type nft_counter_obj_type __read_mostly = {
+struct nft_object_type nft_counter_obj_type __read_mostly = {
.type = NFT_OBJECT_COUNTER,
.ops = &nft_counter_obj_ops,
.maxattr = NFTA_COUNTER_MAX,
@@ -192,9 +192,8 @@ static struct nft_object_type nft_counter_obj_type __read_mostly = {
.owner = THIS_MODULE,
};
-static void nft_counter_eval(const struct nft_expr *expr,
- struct nft_regs *regs,
- const struct nft_pktinfo *pkt)
+void nft_counter_eval(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
{
struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
@@ -275,7 +274,15 @@ static void nft_counter_offload_stats(struct nft_expr *expr,
preempt_enable();
}
-static struct nft_expr_type nft_counter_type;
+void nft_counter_init_seqcount(void)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu)
+ seqcount_init(per_cpu_ptr(&nft_counter_seq, cpu));
+}
+
+struct nft_expr_type nft_counter_type;
static const struct nft_expr_ops nft_counter_ops = {
.type = &nft_counter_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_counter_percpu_priv)),
@@ -289,7 +296,7 @@ static const struct nft_expr_ops nft_counter_ops = {
.offload_stats = nft_counter_offload_stats,
};
-static struct nft_expr_type nft_counter_type __read_mostly = {
+struct nft_expr_type nft_counter_type __read_mostly = {
.name = "counter",
.ops = &nft_counter_ops,
.policy = nft_counter_policy,
@@ -297,39 +304,3 @@ static struct nft_expr_type nft_counter_type __read_mostly = {
.flags = NFT_EXPR_STATEFUL,
.owner = THIS_MODULE,
};
-
-static int __init nft_counter_module_init(void)
-{
- int cpu, err;
-
- for_each_possible_cpu(cpu)
- seqcount_init(per_cpu_ptr(&nft_counter_seq, cpu));
-
- err = nft_register_obj(&nft_counter_obj_type);
- if (err < 0)
- return err;
-
- err = nft_register_expr(&nft_counter_type);
- if (err < 0)
- goto err1;
-
- return 0;
-err1:
- nft_unregister_obj(&nft_counter_obj_type);
- return err;
-}
-
-static void __exit nft_counter_module_exit(void)
-{
- nft_unregister_expr(&nft_counter_type);
- nft_unregister_obj(&nft_counter_obj_type);
-}
-
-module_init(nft_counter_module_init);
-module_exit(nft_counter_module_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Patrick McHardy <kaber@...sh.net>");
-MODULE_ALIAS_NFT_EXPR("counter");
-MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_COUNTER);
-MODULE_DESCRIPTION("nftables counter rule support");
--
2.30.2
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