Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following patchset contains Netfilter updates for net-next:

1) Skip non-SCTP packets in the new SCTP chunk support for nft_exthdr,
   from Phil Sutter.

2) Simplify TCP option sanity check for TCP packets, also from Phil.

3) Add a new expression to store when the rule has been used last time.

4) Pass the hook state object to log function, from Florian Westphal.

5) Document the new sysctl knobs to tune the flowtable timeouts,
   from Oz Shlomo.

6) Fix snprintf error check in the new nfnetlink_hook infrastructure,
   from Dan Carpenter.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

16 files changed, 184 insertions, 48 deletions

diff --git a/Documentation/networking/nf_conntrack-sysctl.rst b/Documentation/networking/nf_conntrack-sysctl.rst
index 11a9b76786cb..0467b30e4abe 100644
--- a/Documentation/networking/nf_conntrack-sysctl.rst
+++ b/Documentation/networking/nf_conntrack-sysctl.rst
@@ -177,3 +177,27 @@ nf_conntrack_gre_timeout_stream - INTEGER (seconds)
 
 	This extended timeout will be used in case there is an GRE stream
 	detected.
+
+nf_flowtable_tcp_timeout - INTEGER (seconds)
+        default 30
+
+        Control offload timeout for tcp connections.
+        TCP connections may be offloaded from nf conntrack to nf flow table.
+        Once aged, the connection is returned to nf conntrack with tcp pickup timeout.
+
+nf_flowtable_tcp_pickup - INTEGER (seconds)
+        default 120
+
+        TCP connection timeout after being aged from nf flow table offload.
+
+nf_flowtable_udp_timeout - INTEGER (seconds)
+        default 30
+
+        Control offload timeout for udp connections.
+        UDP connections may be offloaded from nf conntrack to nf flow table.
+        Once aged, the connection is returned to nf conntrack with udp pickup timeout.
+
+nf_flowtable_udp_pickup - INTEGER (seconds)
+        default 30
+
+        UDP connection timeout after being aged from nf flow table offload.
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
index 96f9cf81f46b..1f47bef51722 100644
--- a/include/net/netfilter/nf_conntrack_l4proto.h
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -159,22 +159,26 @@ unsigned int nf_ct_port_nlattr_tuple_size(void);
 extern const struct nla_policy nf_ct_port_nla_policy[];
 
 #ifdef CONFIG_SYSCTL
-__printf(3, 4) __cold
+__printf(4, 5) __cold
 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
 			       const struct nf_conn *ct,
+			       const struct nf_hook_state *state,
 			       const char *fmt, ...);
-__printf(5, 6) __cold
+__printf(4, 5) __cold
 void nf_l4proto_log_invalid(const struct sk_buff *skb,
-			    struct net *net,
-			    u16 pf, u8 protonum,
+			    const struct nf_hook_state *state,
+			    u8 protonum,
 			    const char *fmt, ...);
 #else
-static inline __printf(5, 6) __cold
-void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net,
-			    u16 pf, u8 protonum, const char *fmt, ...) {}
-static inline __printf(3, 4) __cold
+static inline __printf(4, 5) __cold
+void nf_l4proto_log_invalid(const struct sk_buff *skb,
+			    const struct nf_hook_state *state,
+			    u8 protonum,
+			    const char *fmt, ...) {}
+static inline __printf(4, 5) __cold
 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
 			       const struct nf_conn *ct,
+			       const struct nf_hook_state *state,
 			       const char *fmt, ...) { }
 #endif /* CONFIG_SYSCTL */
 
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
@@ -1196,6 +1196,21 @@ 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
  *
  * @NFTA_LOG_GROUP: netlink group to send messages to (NLA_U32)
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_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index be14e0bea4c8..55647409a9be 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -45,12 +45,13 @@
 static DEFINE_MUTEX(nf_ct_proto_mutex);
 
 #ifdef CONFIG_SYSCTL
-__printf(5, 6)
+__printf(4, 5)
 void nf_l4proto_log_invalid(const struct sk_buff *skb,
-			    struct net *net,
-			    u16 pf, u8 protonum,
+			    const struct nf_hook_state *state,
+			    u8 protonum,
 			    const char *fmt, ...)
 {
+	struct net *net = state->net;
 	struct va_format vaf;
 	va_list args;
 
@@ -62,15 +63,16 @@ void nf_l4proto_log_invalid(const struct sk_buff *skb,
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
-		      "nf_ct_proto_%d: %pV ", protonum, &vaf);
+	nf_log_packet(net, state->pf, 0, skb, state->in, state->out,
+		      NULL, "nf_ct_proto_%d: %pV ", protonum, &vaf);
 	va_end(args);
 }
 EXPORT_SYMBOL_GPL(nf_l4proto_log_invalid);
 
-__printf(3, 4)
+__printf(4, 5)
 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
 			       const struct nf_conn *ct,
+			       const struct nf_hook_state *state,
 			       const char *fmt, ...)
 {
 	struct va_format vaf;
@@ -85,7 +87,7 @@ void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	nf_l4proto_log_invalid(skb, net, nf_ct_l3num(ct),
+	nf_l4proto_log_invalid(skb, state,
 			       nf_ct_protonum(ct), "%pV", &vaf);
 	va_end(args);
 }
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
index 4f33307fa3cf..c1557d47ccd1 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -382,7 +382,8 @@ dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] =
 
 static noinline bool
 dccp_new(struct nf_conn *ct, const struct sk_buff *skb,
-	 const struct dccp_hdr *dh)
+	 const struct dccp_hdr *dh,
+	 const struct nf_hook_state *hook_state)
 {
 	struct net *net = nf_ct_net(ct);
 	struct nf_dccp_net *dn;
@@ -414,7 +415,7 @@ dccp_new(struct nf_conn *ct, const struct sk_buff *skb,
 	return true;
 
 out_invalid:
-	nf_ct_l4proto_log_invalid(skb, ct, "%s", msg);
+	nf_ct_l4proto_log_invalid(skb, ct, hook_state, "%s", msg);
 	return false;
 }
 
@@ -464,8 +465,7 @@ static bool dccp_error(const struct dccp_hdr *dh,
 	}
 	return false;
 out_invalid:
-	nf_l4proto_log_invalid(skb, state->net, state->pf,
-			       IPPROTO_DCCP, "%s", msg);
+	nf_l4proto_log_invalid(skb, state, IPPROTO_DCCP, "%s", msg);
 	return true;
 }
 
@@ -488,7 +488,7 @@ int nf_conntrack_dccp_packet(struct nf_conn *ct, struct sk_buff *skb,
 		return -NF_ACCEPT;
 
 	type = dh->dccph_type;
-	if (!nf_ct_is_confirmed(ct) && !dccp_new(ct, skb, dh))
+	if (!nf_ct_is_confirmed(ct) && !dccp_new(ct, skb, dh, state))
 		return -NF_ACCEPT;
 
 	if (type == DCCP_PKT_RESET &&
@@ -543,11 +543,11 @@ int nf_conntrack_dccp_packet(struct nf_conn *ct, struct sk_buff *skb,
 		ct->proto.dccp.last_pkt = type;
 
 		spin_unlock_bh(&ct->lock);
-		nf_ct_l4proto_log_invalid(skb, ct, "%s", "invalid packet");
+		nf_ct_l4proto_log_invalid(skb, ct, state, "%s", "invalid packet");
 		return NF_ACCEPT;
 	case CT_DCCP_INVALID:
 		spin_unlock_bh(&ct->lock);
-		nf_ct_l4proto_log_invalid(skb, ct, "%s", "invalid state transition");
+		nf_ct_l4proto_log_invalid(skb, ct, state, "%s", "invalid state transition");
 		return -NF_ACCEPT;
 	}
 
diff --git a/net/netfilter/nf_conntrack_proto_icmp.c b/net/netfilter/nf_conntrack_proto_icmp.c
index 4efd8741c105..b38b7164acd5 100644
--- a/net/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/netfilter/nf_conntrack_proto_icmp.c
@@ -170,12 +170,12 @@ int nf_conntrack_inet_error(struct nf_conn *tmpl, struct sk_buff *skb,
 	ct_daddr = &ct->tuplehash[dir].tuple.dst.u3;
 	if (!nf_inet_addr_cmp(outer_daddr, ct_daddr)) {
 		if (state->pf == AF_INET) {
-			nf_l4proto_log_invalid(skb, state->net, state->pf,
+			nf_l4proto_log_invalid(skb, state,
 					       l4proto,
 					       "outer daddr %pI4 != inner %pI4",
 					       &outer_daddr->ip, &ct_daddr->ip);
 		} else if (state->pf == AF_INET6) {
-			nf_l4proto_log_invalid(skb, state->net, state->pf,
+			nf_l4proto_log_invalid(skb, state,
 					       l4proto,
 					       "outer daddr %pI6 != inner %pI6",
 					       &outer_daddr->ip6, &ct_daddr->ip6);
@@ -197,8 +197,7 @@ static void icmp_error_log(const struct sk_buff *skb,
 			   const struct nf_hook_state *state,
 			   const char *msg)
 {
-	nf_l4proto_log_invalid(skb, state->net, state->pf,
-			       IPPROTO_ICMP, "%s", msg);
+	nf_l4proto_log_invalid(skb, state, IPPROTO_ICMP, "%s", msg);
 }
 
 /* Small and modified version of icmp_rcv */
diff --git a/net/netfilter/nf_conntrack_proto_icmpv6.c b/net/netfilter/nf_conntrack_proto_icmpv6.c
index facd8c64ec4e..61e3b05cf02c 100644
--- a/net/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/netfilter/nf_conntrack_proto_icmpv6.c
@@ -126,8 +126,7 @@ static void icmpv6_error_log(const struct sk_buff *skb,
 			     const struct nf_hook_state *state,
 			     const char *msg)
 {
-	nf_l4proto_log_invalid(skb, state->net, state->pf,
-			       IPPROTO_ICMPV6, "%s", msg);
+	nf_l4proto_log_invalid(skb, state, IPPROTO_ICMPV6, "%s", msg);
 }
 
 int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index fb8dc02e502f..2394238d01c9 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -351,7 +351,7 @@ static bool sctp_error(struct sk_buff *skb,
 	}
 	return false;
 out_invalid:
-	nf_l4proto_log_invalid(skb, state->net, state->pf, IPPROTO_SCTP, "%s", logmsg);
+	nf_l4proto_log_invalid(skb, state, IPPROTO_SCTP, "%s", logmsg);
 	return true;
 }
 
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index de840fc41a2e..f7e8baf59b51 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -446,14 +446,15 @@ static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff,
 	}
 }
 
-static bool tcp_in_window(const struct nf_conn *ct,
-			  struct ip_ct_tcp *state,
+static bool tcp_in_window(struct nf_conn *ct,
 			  enum ip_conntrack_dir dir,
 			  unsigned int index,
 			  const struct sk_buff *skb,
 			  unsigned int dataoff,
-			  const struct tcphdr *tcph)
+			  const struct tcphdr *tcph,
+			  const struct nf_hook_state *hook_state)
 {
+	struct ip_ct_tcp *state = &ct->proto.tcp;
 	struct net *net = nf_ct_net(ct);
 	struct nf_tcp_net *tn = nf_tcp_pernet(net);
 	struct ip_ct_tcp_state *sender = &state->seen[dir];
@@ -670,7 +671,7 @@ static bool tcp_in_window(const struct nf_conn *ct,
 		    tn->tcp_be_liberal)
 			res = true;
 		if (!res) {
-			nf_ct_l4proto_log_invalid(skb, ct,
+			nf_ct_l4proto_log_invalid(skb, ct, hook_state,
 			"%s",
 			before(seq, sender->td_maxend + 1) ?
 			in_recv_win ?
@@ -710,7 +711,7 @@ static void tcp_error_log(const struct sk_buff *skb,
 			  const struct nf_hook_state *state,
 			  const char *msg)
 {
-	nf_l4proto_log_invalid(skb, state->net, state->pf, IPPROTO_TCP, "%s", msg);
+	nf_l4proto_log_invalid(skb, state, IPPROTO_TCP, "%s", msg);
 }
 
 /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c.  */
@@ -970,7 +971,7 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
 					IP_CT_EXP_CHALLENGE_ACK;
 		}
 		spin_unlock_bh(&ct->lock);
-		nf_ct_l4proto_log_invalid(skb, ct,
+		nf_ct_l4proto_log_invalid(skb, ct, state,
 					  "packet (index %d) in dir %d ignored, state %s",
 					  index, dir,
 					  tcp_conntrack_names[old_state]);
@@ -995,7 +996,7 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
 		pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n",
 			 dir, get_conntrack_index(th), old_state);
 		spin_unlock_bh(&ct->lock);
-		nf_ct_l4proto_log_invalid(skb, ct, "invalid state");
+		nf_ct_l4proto_log_invalid(skb, ct, state, "invalid state");
 		return -NF_ACCEPT;
 	case TCP_CONNTRACK_TIME_WAIT:
 		/* RFC5961 compliance cause stack to send "challenge-ACK"
@@ -1010,7 +1011,7 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
 			/* Detected RFC5961 challenge ACK */
 			ct->proto.tcp.last_flags &= ~IP_CT_EXP_CHALLENGE_ACK;
 			spin_unlock_bh(&ct->lock);
-			nf_ct_l4proto_log_invalid(skb, ct, "challenge-ack ignored");
+			nf_ct_l4proto_log_invalid(skb, ct, state, "challenge-ack ignored");
 			return NF_ACCEPT; /* Don't change state */
 		}
 		break;
@@ -1035,7 +1036,7 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
 			if (before(seq, ct->proto.tcp.seen[!dir].td_maxack)) {
 				/* Invalid RST  */
 				spin_unlock_bh(&ct->lock);
-				nf_ct_l4proto_log_invalid(skb, ct, "invalid rst");
+				nf_ct_l4proto_log_invalid(skb, ct, state, "invalid rst");
 				return -NF_ACCEPT;
 			}
 
@@ -1079,8 +1080,8 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
 		break;
 	}
 
-	if (!tcp_in_window(ct, &ct->proto.tcp, dir, index,
-			   skb, dataoff, th)) {
+	if (!tcp_in_window(ct, dir, index,
+			   skb, dataoff, th, state)) {
 		spin_unlock_bh(&ct->lock);
 		return -NF_ACCEPT;
 	}
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index 68911fcaa0f1..698fee49e732 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -38,8 +38,7 @@ static void udp_error_log(const struct sk_buff *skb,
 			  const struct nf_hook_state *state,
 			  const char *msg)
 {
-	nf_l4proto_log_invalid(skb, state->net, state->pf,
-			       IPPROTO_UDP, "%s", msg);
+	nf_l4proto_log_invalid(skb, state, IPPROTO_UDP, "%s", msg);
 }
 
 static bool udp_error(struct sk_buff *skb,
@@ -130,8 +129,7 @@ static void udplite_error_log(const struct sk_buff *skb,
 			      const struct nf_hook_state *state,
 			      const char *msg)
 {
-	nf_l4proto_log_invalid(skb, state->net, state->pf,
-			       IPPROTO_UDPLITE, "%s", msg);
+	nf_l4proto_log_invalid(skb, state, IPPROTO_UDPLITE, "%s", msg);
 }
 
 static bool udplite_error(struct sk_buff *skb,
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/nfnetlink_hook.c b/net/netfilter/nfnetlink_hook.c
index 58fda6ac663b..50b4e3c9347a 100644
--- a/net/netfilter/nfnetlink_hook.c
+++ b/net/netfilter/nfnetlink_hook.c
@@ -126,8 +126,10 @@ static int nfnl_hook_dump_one(struct sk_buff *nlskb,
 
 #ifdef CONFIG_KALLSYMS
 	ret = snprintf(sym, sizeof(sym), "%ps", ops->hook);
-	if (ret < 0 || ret > (int)sizeof(sym))
+	if (ret >= sizeof(sym)) {
+		ret = -EINVAL;
 		goto nla_put_failure;
+	}
 
 	module_name = strstr(sym, " [");
 	if (module_name) {
diff --git a/net/netfilter/nft_exthdr.c b/net/netfilter/nft_exthdr.c
index 7f705b5c09de..4f583d2e220e 100644
--- a/net/netfilter/nft_exthdr.c
+++ b/net/netfilter/nft_exthdr.c
@@ -164,7 +164,7 @@ nft_tcp_header_pointer(const struct nft_pktinfo *pkt,
 {
 	struct tcphdr *tcph;
 
-	if (!pkt->tprot_set || pkt->tprot != IPPROTO_TCP)
+	if (pkt->tprot != IPPROTO_TCP)
 		return NULL;
 
 	tcph = skb_header_pointer(pkt->skb, nft_thoff(pkt), sizeof(*tcph), buffer);
@@ -312,6 +312,9 @@ static void nft_exthdr_sctp_eval(const struct nft_expr *expr,
 	const struct sctp_chunkhdr *sch;
 	struct sctp_chunkhdr _sch;
 
+	if (pkt->tprot != IPPROTO_SCTP)
+		goto err;
+
 	do {
 		sch = skb_header_pointer(pkt->skb, offset, sizeof(_sch), &_sch);
 		if (!sch || !sch->length)
@@ -334,7 +337,7 @@ static void nft_exthdr_sctp_eval(const struct nft_expr *expr,
 		}
 		offset += SCTP_PAD4(ntohs(sch->length));
 	} while (offset < pkt->skb->len);
-
+err:
 	if (priv->flags & NFT_EXTHDR_F_PRESENT)
 		nft_reg_store8(dest, false);
 	else
diff --git a/net/netfilter/nft_last.c b/net/netfilter/nft_last.c
new file mode 100644
index 000000000000..913ac45167f2
--- /dev/null
+++ b/net/netfilter/nft_last.c
@@ -0,0 +1,87 @@
+// 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 (time_before(jiffies, priv->last_jiffies))
+		priv->last_set = 0;
+
+	if (priv->last_set)
+		msecs = nf_jiffies64_to_msecs(jiffies - priv->last_jiffies);
+	else
+		msecs = 0;
+
+	if (nla_put_be32(skb, NFTA_LAST_SET, htonl(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,
+};