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[nf-next,v4] netfilter: nf_tables: add last expression

Message ID 20210609184721.91820-1-pablo@netfilter.org
State Changes Requested
Delegated to: Pablo Neira
Headers show
Series [nf-next,v4] netfilter: nf_tables: add last expression | expand

Commit Message

Pablo Neira Ayuso June 9, 2021, 6:47 p.m. UTC 
Add a new optional expression that tells you when last matching on a
given rule / set element element has happened.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
- add NFTA_LAST_SET that specifies if the timestamp has been updated
- provide delta between jiffies and last timestamp to userspace
- allow to restore last timestamp

 include/net/netfilter/nf_tables_core.h   |  1 +
 include/uapi/linux/netfilter/nf_tables.h | 15 +++++
 net/netfilter/Makefile                   |  2 +-
 net/netfilter/nf_tables_core.c           |  1 +
 net/netfilter/nft_last.c                 | 84 ++++++++++++++++++++++++
 5 files changed, 102 insertions(+), 1 deletion(-)
 create mode 100644 net/netfilter/nft_last.c

Comments

kernel test robot June 16, 2021, 11:10 p.m. UTC | #1 
Hi Pablo,

I love your patch! Perhaps something to improve:

[auto build test WARNING on nf/master]
[also build test WARNING on nf-next/master v5.13-rc6 next-20210616]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Pablo-Neira-Ayuso/netfilter-nf_tables-add-last-expression/20210617-021223
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git master
config: i386-randconfig-s001-20210615 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://github.com/0day-ci/linux/commit/12cfd8daf813a3f62294bdbe915c1d2cd6946a30
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Pablo-Neira-Ayuso/netfilter-nf_tables-add-last-expression/20210617-021223
        git checkout 12cfd8daf813a3f62294bdbe915c1d2cd6946a30
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> net/netfilter/nft_last.c:59:46: sparse: sparse: incorrect type in argument 3 (different base types) @@     expected restricted __be32 [usertype] value @@     got restricted __be16 [usertype] @@
   net/netfilter/nft_last.c:59:46: sparse:     expected restricted __be32 [usertype] value
   net/netfilter/nft_last.c:59:46: sparse:     got restricted __be16 [usertype]

vim +59 net/netfilter/nft_last.c

    48	
    49	static int nft_last_dump(struct sk_buff *skb, const struct nft_expr *expr)
    50	{
    51		struct nft_last_priv *priv = nft_expr_priv(expr);
    52		__be64 msecs;
    53	
    54		if (priv->last_set)
    55			msecs = nf_jiffies64_to_msecs(jiffies - priv->last_jiffies);
    56		else
    57			msecs = 0;
    58	
  > 59		if (nla_put_be32(skb, NFTA_LAST_SET, htons(priv->last_set)) ||
    60		    nla_put_be64(skb, NFTA_LAST_MSECS, msecs, NFTA_LAST_PAD))
    61			goto nla_put_failure;
    62	
    63		return 0;
    64	
    65	nla_put_failure:
    66		return -1;
    67	}
    68	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/include/net/netfilter/nf_tables_core.h b/include/net/netfilter/nf_tables_core.h
index 46c8d5bb5d8d..0fa5a6d98a00 100644
--- a/include/net/netfilter/nf_tables_core.h
+++ b/include/net/netfilter/nf_tables_core.h
@@ -16,6 +16,7 @@  extern struct nft_expr_type nft_range_type;
 extern struct nft_expr_type nft_meta_type;
 extern struct nft_expr_type nft_rt_type;
 extern struct nft_expr_type nft_exthdr_type;
+extern struct nft_expr_type nft_last_type;
 
 #ifdef CONFIG_NETWORK_SECMARK
 extern struct nft_object_type nft_secmark_obj_type;
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 19715e2679d1..e94d1fa554cb 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -1195,6 +1195,21 @@  enum nft_counter_attributes {
 };
 #define NFTA_COUNTER_MAX	(__NFTA_COUNTER_MAX - 1)
 
+/**
+ * enum nft_last_attributes - nf_tables last expression netlink attributes
+ *
+ * @NFTA_LAST_SET: last update has been set, zero means never updated (NLA_U32)
+ * @NFTA_LAST_MSECS: milliseconds since last update (NLA_U64)
+ */
+enum nft_last_attributes {
+	NFTA_LAST_UNSPEC,
+	NFTA_LAST_SET,
+	NFTA_LAST_MSECS,
+	NFTA_LAST_PAD,
+	__NFTA_LAST_MAX
+};
+#define NFTA_LAST_MAX	(__NFTA_LAST_MAX - 1)
+
 /**
  * enum nft_log_attributes - nf_tables log expression netlink attributes
  *
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 87112dad1fd4..049890e00a3d 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -74,7 +74,7 @@  obj-$(CONFIG_NF_DUP_NETDEV)	+= nf_dup_netdev.o
 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_dynset.o nft_meta.o nft_rt.o nft_exthdr.o nft_last.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
diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 7780342e2f2d..866cfba04d6c 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -268,6 +268,7 @@  static struct nft_expr_type *nft_basic_types[] = {
 	&nft_meta_type,
 	&nft_rt_type,
 	&nft_exthdr_type,
+	&nft_last_type,
 };
 
 static struct nft_object_type *nft_basic_objects[] = {
diff --git a/net/netfilter/nft_last.c b/net/netfilter/nft_last.c
new file mode 100644
index 000000000000..249c3f3ed1c3
--- /dev/null
+++ b/net/netfilter/nft_last.c
@@ -0,0 +1,84 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nf_tables.h>
+
+struct nft_last_priv {
+	unsigned long	last_jiffies;
+	unsigned int	last_set;
+};
+
+static const struct nla_policy nft_last_policy[NFTA_LAST_MAX + 1] = {
+	[NFTA_LAST_SET] = { .type = NLA_U32 },
+	[NFTA_LAST_MSECS] = { .type = NLA_U64 },
+};
+
+static int nft_last_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
+			 const struct nlattr * const tb[])
+{
+	struct nft_last_priv *priv = nft_expr_priv(expr);
+	u64 last_jiffies;
+	int err;
+
+	if (tb[NFTA_LAST_MSECS]) {
+		err = nf_msecs_to_jiffies64(tb[NFTA_LAST_MSECS], &last_jiffies);
+		if (err < 0)
+			return err;
+
+		priv->last_jiffies = jiffies + (unsigned long)last_jiffies;
+		priv->last_set = 1;
+	}
+
+	return 0;
+}
+
+static void nft_last_eval(const struct nft_expr *expr,
+			  struct nft_regs *regs, const struct nft_pktinfo *pkt)
+{
+	struct nft_last_priv *priv = nft_expr_priv(expr);
+
+	priv->last_jiffies = jiffies;
+	priv->last_set = 1;
+}
+
+static int nft_last_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+	struct nft_last_priv *priv = nft_expr_priv(expr);
+	__be64 msecs;
+
+	if (priv->last_set)
+		msecs = nf_jiffies64_to_msecs(jiffies - priv->last_jiffies);
+	else
+		msecs = 0;
+
+	if (nla_put_be32(skb, NFTA_LAST_SET, htons(priv->last_set)) ||
+	    nla_put_be64(skb, NFTA_LAST_MSECS, msecs, NFTA_LAST_PAD))
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static const struct nft_expr_ops nft_last_ops = {
+	.type		= &nft_last_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_last_priv)),
+	.eval		= nft_last_eval,
+	.init		= nft_last_init,
+	.dump		= nft_last_dump,
+};
+
+struct nft_expr_type nft_last_type __read_mostly = {
+	.name		= "last",
+	.ops		= &nft_last_ops,
+	.policy		= nft_last_policy,
+	.maxattr	= NFTA_LAST_MAX,
+	.flags		= NFT_EXPR_STATEFUL,
+	.owner		= THIS_MODULE,
+};