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 your net-next tree:

1) Support for transparent proxying for nf_tables, from Mate Eckl.

2) Patchset to add OS passive fingerprint recognition for nf_tables,
from Fernando Fernandez. This takes common code from xt_osf and
place it into the new nfnetlink_osf module for codebase sharing.

3) Lightweight tunneling support for nf_tables.

4) meta and lookup are likely going to be used in rulesets, make them
direct calls. From Florian Westphal.

A bunch of incremental updates:

5) use PTR_ERR_OR_ZERO() from nft_numgen, from YueHaibing.

6) Use kvmalloc_array() to allocate hashtables, from Li RongQing.

7) Explicit dependencies between nfnetlink_cttimeout and conntrack
timeout extensions, from Harsha Sharma.

8) Simplify NLM_F_CREATE handling in nf_tables.

9) Removed unused variable in the get element command, from
YueHaibing.

10) Expose bridge hook priorities through uapi, from Mate Eckl.

And a few fixes for previous Netfilter batch for net-next:

11) Use per-netns mutex from flowtable event, from Florian Westphal.

12) Remove explicit dependency on iptables CT target from conntrack
zones, from Florian.

13) Fix use-after-free in rmmod nf_conntrack path, also from Florian.
====================

Signed-off-by: David S. Miller <[e-mail]>

include/linux/netfilter/nf_osf.h include/linux/netfilter/nfnetlink_osf.h

···
-#include <uapi/linux/netfilter/nf_osf.h>
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NFOSF_H
+#define _NFOSF_H
+
+#include <uapi/linux/netfilter/nfnetlink_osf.h>
 
 /* Initial window size option state machine: multiple of mss, mtu or
  * plain numeric value. Can also be made as plain numeric value which
···
 	FMATCH_OPT_WRONG,
 };
 
+extern struct list_head nf_osf_fingers[2];
+
 struct nf_osf_finger {
 	struct rcu_head			rcu_head;
 	struct list_head		finger_entry;
···
 		  int hooknum, struct net_device *in, struct net_device *out,
 		  const struct nf_osf_info *info, struct net *net,
 		  const struct list_head *nf_osf_fingers);
+
+const char *nf_osf_find(const struct sk_buff *skb,
+                        const struct list_head *nf_osf_fingers);
+
+#endif /* _NFOSF_H */

include/linux/netfilter_bridge.h

···
 #include <uapi/linux/netfilter_bridge.h>
 #include <linux/skbuff.h>
 
-enum nf_br_hook_priorities {
-	NF_BR_PRI_FIRST = INT_MIN,
-	NF_BR_PRI_NAT_DST_BRIDGED = -300,
-	NF_BR_PRI_FILTER_BRIDGED = -200,
-	NF_BR_PRI_BRNF = 0,
-	NF_BR_PRI_NAT_DST_OTHER = 100,
-	NF_BR_PRI_FILTER_OTHER = 200,
-	NF_BR_PRI_NAT_SRC = 300,
-	NF_BR_PRI_LAST = INT_MAX,
-};
-
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 
 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);

include/net/netfilter/nf_conntrack.h

···
  */
 void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls);
 
-void nf_ct_free_hashtable(void *hash, unsigned int size);
-
 int nf_conntrack_hash_check_insert(struct nf_conn *ct);
 bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
 

include/net/netfilter/nf_tables_core.h

···
 extern struct nft_set_type nft_set_rbtree_type;
 extern struct nft_set_type nft_set_bitmap_type;
 
+struct nft_expr;
+struct nft_regs;
+struct nft_pktinfo;
+void nft_meta_get_eval(const struct nft_expr *expr,
+		       struct nft_regs *regs, const struct nft_pktinfo *pkt);
+void nft_lookup_eval(const struct nft_expr *expr,
+		     struct nft_regs *regs, const struct nft_pktinfo *pkt);
 #endif /* _NET_NF_TABLES_CORE_H */

include/uapi/linux/netfilter/nf_osf.h include/uapi/linux/netfilter/nfnetlink_osf.h

···
 	OSF_ATTR_MAX,
 };
 
+/*
+ * Add/remove fingerprint from the kernel.
+ */
+enum nf_osf_msg_types {
+	OSF_MSG_ADD,
+	OSF_MSG_REMOVE,
+	OSF_MSG_MAX,
+};
+
 #endif /* _NF_OSF_H */

include/uapi/linux/netfilter/nf_tables.h

···
 #define NFTA_NAT_MAX		(__NFTA_NAT_MAX - 1)
 
 /**
+ * enum nft_tproxy_attributes - nf_tables tproxy expression netlink attributes
+ *
+ * NFTA_TPROXY_FAMILY: Target address family (NLA_U32: nft_registers)
+ * NFTA_TPROXY_REG_ADDR: Target address register (NLA_U32: nft_registers)
+ * NFTA_TPROXY_REG_PORT: Target port register (NLA_U32: nft_registers)
+ */
+enum nft_tproxy_attributes {
+	NFTA_TPROXY_UNSPEC,
+	NFTA_TPROXY_FAMILY,
+	NFTA_TPROXY_REG_ADDR,
+	NFTA_TPROXY_REG_PORT,
+	__NFTA_TPROXY_MAX
+};
+#define NFTA_TPROXY_MAX		(__NFTA_TPROXY_MAX - 1)
+
+/**
  * enum nft_masq_attributes - nf_tables masquerade expression attributes
  *
  * @NFTA_MASQ_FLAGS: NAT flags (see NF_NAT_RANGE_* in linux/netfilter/nf_nat.h) (NLA_U32)
···
 #define NFT_OBJECT_CT_HELPER	3
 #define NFT_OBJECT_LIMIT	4
 #define NFT_OBJECT_CONNLIMIT	5
-#define __NFT_OBJECT_MAX	6
+#define NFT_OBJECT_TUNNEL	6
+#define __NFT_OBJECT_MAX	7
 #define NFT_OBJECT_MAX		(__NFT_OBJECT_MAX - 1)
 
 /**
···
 	__NFTA_FLOWTABLE_HOOK_MAX
 };
 #define NFTA_FLOWTABLE_HOOK_MAX	(__NFTA_FLOWTABLE_HOOK_MAX - 1)
+
+enum nft_osf_attributes {
+	NFTA_OSF_UNSPEC,
+	NFTA_OSF_DREG,
+	__NFTA_OSF_MAX,
+};
+#define NFTA_OSF_MAX (__NFTA_OSF_MAX - 1)
 
 /**
  * enum nft_device_attributes - nf_tables device netlink attributes
···
 	__NFT_NG_MAX
 };
 #define NFT_NG_MAX	(__NFT_NG_MAX - 1)
+
+enum nft_tunnel_key_ip_attributes {
+	NFTA_TUNNEL_KEY_IP_UNSPEC,
+	NFTA_TUNNEL_KEY_IP_SRC,
+	NFTA_TUNNEL_KEY_IP_DST,
+	__NFTA_TUNNEL_KEY_IP_MAX
+};
+#define NFTA_TUNNEL_KEY_IP_MAX	(__NFTA_TUNNEL_KEY_IP_MAX - 1)
+
+enum nft_tunnel_ip6_attributes {
+	NFTA_TUNNEL_KEY_IP6_UNSPEC,
+	NFTA_TUNNEL_KEY_IP6_SRC,
+	NFTA_TUNNEL_KEY_IP6_DST,
+	NFTA_TUNNEL_KEY_IP6_FLOWLABEL,
+	__NFTA_TUNNEL_KEY_IP6_MAX
+};
+#define NFTA_TUNNEL_KEY_IP6_MAX	(__NFTA_TUNNEL_KEY_IP6_MAX - 1)
+
+enum nft_tunnel_opts_attributes {
+	NFTA_TUNNEL_KEY_OPTS_UNSPEC,
+	NFTA_TUNNEL_KEY_OPTS_VXLAN,
+	NFTA_TUNNEL_KEY_OPTS_ERSPAN,
+	__NFTA_TUNNEL_KEY_OPTS_MAX
+};
+#define NFTA_TUNNEL_KEY_OPTS_MAX	(__NFTA_TUNNEL_KEY_OPTS_MAX - 1)
+
+enum nft_tunnel_opts_vxlan_attributes {
+	NFTA_TUNNEL_KEY_VXLAN_UNSPEC,
+	NFTA_TUNNEL_KEY_VXLAN_GBP,
+	__NFTA_TUNNEL_KEY_VXLAN_MAX
+};
+#define NFTA_TUNNEL_KEY_VXLAN_MAX	(__NFTA_TUNNEL_KEY_VXLAN_MAX - 1)
+
+enum nft_tunnel_opts_erspan_attributes {
+	NFTA_TUNNEL_KEY_ERSPAN_UNSPEC,
+	NFTA_TUNNEL_KEY_ERSPAN_VERSION,
+	NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX,
+	NFTA_TUNNEL_KEY_ERSPAN_V2_HWID,
+	NFTA_TUNNEL_KEY_ERSPAN_V2_DIR,
+	__NFTA_TUNNEL_KEY_ERSPAN_MAX
+};
+#define NFTA_TUNNEL_KEY_ERSPAN_MAX	(__NFTA_TUNNEL_KEY_ERSPAN_MAX - 1)
+
+enum nft_tunnel_flags {
+	NFT_TUNNEL_F_ZERO_CSUM_TX	= (1 << 0),
+	NFT_TUNNEL_F_DONT_FRAGMENT	= (1 << 1),
+	NFT_TUNNEL_F_SEQ_NUMBER		= (1 << 2),
+};
+#define NFT_TUNNEL_F_MASK	(NFT_TUNNEL_F_ZERO_CSUM_TX | \
+				 NFT_TUNNEL_F_DONT_FRAGMENT | \
+				 NFT_TUNNEL_F_SEQ_NUMBER)
+
+enum nft_tunnel_key_attributes {
+	NFTA_TUNNEL_KEY_UNSPEC,
+	NFTA_TUNNEL_KEY_ID,
+	NFTA_TUNNEL_KEY_IP,
+	NFTA_TUNNEL_KEY_IP6,
+	NFTA_TUNNEL_KEY_FLAGS,
+	NFTA_TUNNEL_KEY_TOS,
+	NFTA_TUNNEL_KEY_TTL,
+	NFTA_TUNNEL_KEY_SPORT,
+	NFTA_TUNNEL_KEY_DPORT,
+	NFTA_TUNNEL_KEY_OPTS,
+	__NFTA_TUNNEL_KEY_MAX
+};
+#define NFTA_TUNNEL_KEY_MAX	(__NFTA_TUNNEL_KEY_MAX - 1)
+
+enum nft_tunnel_keys {
+	NFT_TUNNEL_PATH,
+	NFT_TUNNEL_ID,
+	__NFT_TUNNEL_MAX
+};
+#define NFT_TUNNEL_MAX	(__NFT_TUNNEL_MAX - 1)
+
+enum nft_tunnel_attributes {
+	NFTA_TUNNEL_UNSPEC,
+	NFTA_TUNNEL_KEY,
+	NFTA_TUNNEL_DREG,
+	__NFTA_TUNNEL_MAX
+};
+#define NFTA_TUNNEL_MAX	(__NFTA_TUNNEL_MAX - 1)
 
 #endif /* _LINUX_NF_TABLES_H */

include/uapi/linux/netfilter/xt_osf.h

···
 #include <linux/types.h>
 #include <linux/ip.h>
 #include <linux/tcp.h>
-#include <linux/netfilter/nf_osf.h>
+#include <linux/netfilter/nfnetlink_osf.h>
 
 #define XT_OSF_GENRE		NF_OSF_GENRE
 #define XT_OSF_INVERT		NF_OSF_INVERT
···
 #define xt_osf_nlmsg		nf_osf_nlmsg
 
 #define xt_osf_attr_type	nf_osf_attr_type
-/*
- * Add/remove fingerprint from the kernel.
- */
-enum xt_osf_msg_types {
-	OSF_MSG_ADD,
-	OSF_MSG_REMOVE,
-	OSF_MSG_MAX,
-};
+#define xt_osf_msg_types	nf_osf_msg_types
 
 #endif				/* _XT_OSF_H */

include/uapi/linux/netfilter_bridge.h

···
 #define NF_BR_BROUTING		5
 #define NF_BR_NUMHOOKS		6
 
+enum nf_br_hook_priorities {
+	NF_BR_PRI_FIRST = INT_MIN,
+	NF_BR_PRI_NAT_DST_BRIDGED = -300,
+	NF_BR_PRI_FILTER_BRIDGED = -200,
+	NF_BR_PRI_BRNF = 0,
+	NF_BR_PRI_NAT_DST_OTHER = 100,
+	NF_BR_PRI_FILTER_OTHER = 200,
+	NF_BR_PRI_NAT_SRC = 300,
+	NF_BR_PRI_LAST = INT_MAX,
+};
+
 #endif /* _UAPI__LINUX_BRIDGE_NETFILTER_H */

net/bridge/br_netfilter_hooks.c

···
 #include <linux/if_pppox.h>
 #include <linux/ppp_defs.h>
 #include <linux/netfilter_bridge.h>
+#include <uapi/linux/netfilter_bridge.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/netfilter_ipv6.h>
 #include <linux/netfilter_arp.h>

net/bridge/netfilter/ebtable_filter.c

···
  */
 
 #include <linux/netfilter_bridge/ebtables.h>
+#include <uapi/linux/netfilter_bridge.h>
 #include <linux/module.h>
 
 #define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \

net/bridge/netfilter/ebtable_nat.c

···
  */
 
 #include <linux/netfilter_bridge/ebtables.h>
+#include <uapi/linux/netfilter_bridge.h>
 #include <linux/module.h>
 
 #define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \

net/core/dst.c

···
 #endif
 	kfree(md_dst);
 }
+EXPORT_SYMBOL_GPL(metadata_dst_free);
 
 struct metadata_dst __percpu *
 metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags)

net/netfilter/Kconfig

···
 	  and is also scheduled to replace the old syslog-based ipt_LOG
 	  and ip6t_LOG modules.
 
+config NETFILTER_NETLINK_OSF
+	tristate "Netfilter OSF over NFNETLINK interface"
+	depends on NETFILTER_ADVANCED
+	select NETFILTER_NETLINK
+	help
+	  If this option is enabled, the kernel will include support
+	  for passive OS fingerprint via NFNETLINK.
+
 config NF_CONNTRACK
 	tristate "Netfilter connection tracking support"
 	default m if NETFILTER_ADVANCED=n
···
 config NF_CONNTRACK_ZONES
 	bool  'Connection tracking zones'
 	depends on NETFILTER_ADVANCED
-	depends on NETFILTER_XT_TARGET_CT
 	help
 	  This option enables support for connection tracking zones.
 	  Normally, each connection needs to have a unique system wide
···
 	  If unsure, say `N'.
 
 config NF_CONNTRACK_LABELS
-	bool
+	bool "Connection tracking labels"
 	help
 	  This option enables support for assigning user-defined flag bits
-	  to connection tracking entries.  It selected by the connlabel match.
+	  to connection tracking entries.  It can be used with xtables connlabel
+	  match and the nftables ct expression.
 
 config NF_CT_PROTO_DCCP
 	bool 'DCCP protocol connection tracking support'
···
 	tristate  'Connection tracking timeout tuning via Netlink'
 	select NETFILTER_NETLINK
 	depends on NETFILTER_ADVANCED
+	depends on NF_CONNTRACK_TIMEOUT
 	help
 	  This option enables support for connection tracking timeout
 	  fine-grain tuning. This allows you to attach specific timeout
···
 	tristate
 
 endif # NF_CONNTRACK
-
-config NF_OSF
-	tristate
 
 config NF_TABLES
 	select NETFILTER_NETLINK
···
 	  This option adds the "nat" expression that you can use to perform
 	  typical Network Address Translation (NAT) packet transformations.
 
+config NFT_TUNNEL
+	tristate "Netfilter nf_tables tunnel module"
+	help
+	  This option adds the "tunnel" expression that you can use to set
+	  tunneling policies.
+
 config NFT_OBJREF
 	tristate "Netfilter nf_tables stateful object reference module"
 	help
···
 	help
 	  This option allows matching for the presence or absence of a
 	  corresponding socket and its attributes.
+
+config NFT_OSF
+	tristate "Netfilter nf_tables passive OS fingerprint support"
+	depends on NETFILTER_ADVANCED
+	select NETFILTER_NETLINK_OSF
+	help
+	  This option allows matching packets from an specific OS.
+
+config NFT_TPROXY
+	tristate "Netfilter nf_tables tproxy support"
+	depends on IPV6 || IPV6=n
+	select NF_DEFRAG_IPV4
+	select NF_DEFRAG_IPV6 if NF_TABLES_IPV6
+	select NF_TPROXY_IPV4
+	select NF_TPROXY_IPV6 if NF_TABLES_IPV6
+	help
+	  This makes transparent proxy support available in nftables.
 
 if NF_TABLES_NETDEV
 
···
 
 config NETFILTER_XT_MATCH_OSF
 	tristate '"osf" Passive OS fingerprint match'
-	depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
-	select NF_OSF
+	depends on NETFILTER_ADVANCED
+	select NETFILTER_NETLINK_OSF
 	help
 	  This option selects the Passive OS Fingerprinting match module
 	  that allows to passively match the remote operating system by

net/netfilter/Makefile

···
 obj-$(CONFIG_NETFILTER_NETLINK_ACCT) += nfnetlink_acct.o
 obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o
 obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o
+obj-$(CONFIG_NETFILTER_NETLINK_OSF) += nfnetlink_osf.o
 
 # connection tracking
 obj-$(CONFIG_NF_CONNTRACK) += nf_conntrack.o
···
 obj-$(CONFIG_NFT_QUOTA)		+= nft_quota.o
 obj-$(CONFIG_NFT_REJECT) 	+= nft_reject.o
 obj-$(CONFIG_NFT_REJECT_INET)	+= nft_reject_inet.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-$(CONFIG_NFT_FIB)		+= nft_fib.o
 obj-$(CONFIG_NFT_FIB_INET)	+= nft_fib_inet.o
 obj-$(CONFIG_NFT_FIB_NETDEV)	+= nft_fib_netdev.o
-obj-$(CONFIG_NF_OSF)		+= nf_osf.o
 obj-$(CONFIG_NFT_SOCKET)	+= nft_socket.o
+obj-$(CONFIG_NFT_OSF)		+= nft_osf.o
+obj-$(CONFIG_NFT_TPROXY)	+= nft_tproxy.o
 
 # nf_tables netdev
 obj-$(CONFIG_NFT_DUP_NETDEV)	+= nft_dup_netdev.o

net/netfilter/nf_conntrack_core.c

···
 	return net_eq(nf_ct_net(i), data);
 }
 
-void nf_ct_free_hashtable(void *hash, unsigned int size)
-{
-	if (is_vmalloc_addr(hash))
-		vfree(hash);
-	else
-		free_pages((unsigned long)hash,
-			   get_order(sizeof(struct hlist_head) * size));
-}
-EXPORT_SYMBOL_GPL(nf_ct_free_hashtable);
-
 void nf_conntrack_cleanup_start(void)
 {
 	conntrack_gc_work.exiting = true;
···
 {
 	RCU_INIT_POINTER(nf_ct_hook, NULL);
 	cancel_delayed_work_sync(&conntrack_gc_work.dwork);
-	nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size);
+	kvfree(nf_conntrack_hash);
 
 	nf_conntrack_proto_fini();
 	nf_conntrack_seqadj_fini();
···
 {
 	struct hlist_nulls_head *hash;
 	unsigned int nr_slots, i;
-	size_t sz;
 
 	if (*sizep > (UINT_MAX / sizeof(struct hlist_nulls_head)))
 		return NULL;
···
 	BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head));
 	nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head));
 
-	if (nr_slots > (UINT_MAX / sizeof(struct hlist_nulls_head)))
-		return NULL;
-
-	sz = nr_slots * sizeof(struct hlist_nulls_head);
-	hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
-					get_order(sz));
-	if (!hash)
-		hash = vzalloc(sz);
+	hash = kvmalloc_array(nr_slots, sizeof(struct hlist_nulls_head),
+			      GFP_KERNEL | __GFP_ZERO);
 
 	if (hash && nulls)
 		for (i = 0; i < nr_slots; i++)
···
 
 	old_size = nf_conntrack_htable_size;
 	if (old_size == hashsize) {
-		nf_ct_free_hashtable(hash, hashsize);
+		kvfree(hash);
 		return 0;
 	}
 
···
 	local_bh_enable();
 
 	synchronize_net();
-	nf_ct_free_hashtable(old_hash, old_size);
+	kvfree(old_hash);
 	return 0;
 }
 
···
 err_expect:
 	kmem_cache_destroy(nf_conntrack_cachep);
 err_cachep:
-	nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size);
+	kvfree(nf_conntrack_hash);
 	return ret;
 }
 

net/netfilter/nf_conntrack_expect.c

···
 {
 	rcu_barrier(); /* Wait for call_rcu() before destroy */
 	kmem_cache_destroy(nf_ct_expect_cachep);
-	nf_ct_free_hashtable(nf_ct_expect_hash, nf_ct_expect_hsize);
+	kvfree(nf_ct_expect_hash);
 }

net/netfilter/nf_conntrack_helper.c

···
 
 	return 0;
 out_extend:
-	nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize);
+	kvfree(nf_ct_helper_hash);
 	return ret;
 }
 
 void nf_conntrack_helper_fini(void)
 {
 	nf_ct_extend_unregister(&helper_extend);
-	nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize);
+	kvfree(nf_ct_helper_hash);
 }

net/netfilter/nf_conntrack_proto.c

···
 {
 	unsigned int i;
 
-	nf_ct_l4proto_unregister(builtin_l4proto,
-				 ARRAY_SIZE(builtin_l4proto));
 	nf_unregister_sockopt(&so_getorigdst);
 #if IS_ENABLED(CONFIG_IPV6)
 	nf_unregister_sockopt(&so_getorigdst6);
 #endif
-
-	/* free l3proto protocol tables */
+	/* No need to call nf_ct_l4proto_unregister(), the register
+	 * tables are free'd here anyway.
+	 */
 	for (i = 0; i < ARRAY_SIZE(nf_ct_protos); i++)
 		kfree(nf_ct_protos[i]);
 }

net/netfilter/nf_nat_core.c

···
 
 	ret = nf_ct_extend_register(&nat_extend);
 	if (ret < 0) {
-		nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size);
+		kvfree(nf_nat_bysource);
 		pr_err("Unable to register extension\n");
 		return ret;
 	}
···
 	for (i = 0; i < NFPROTO_NUMPROTO; i++)
 		kfree(nf_nat_l4protos[i]);
 	synchronize_net();
-	nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size);
+	kvfree(nf_nat_bysource);
 	unregister_pernet_subsys(&nat_net_ops);
 }
 

net/netfilter/nf_osf.c net/netfilter/nfnetlink_osf.c

···
 #include <linux/netfilter/nfnetlink.h>
 #include <linux/netfilter/x_tables.h>
 #include <net/netfilter/nf_log.h>
-#include <linux/netfilter/nf_osf.h>
+#include <linux/netfilter/nfnetlink_osf.h>
+
+/*
+ * Indexed by dont-fragment bit.
+ * It is the only constant value in the fingerprint.
+ */
+struct list_head nf_osf_fingers[2];
+EXPORT_SYMBOL_GPL(nf_osf_fingers);
 
 static inline int nf_osf_ttl(const struct sk_buff *skb,
 			     int ttl_check, unsigned char f_ttl)
···
 	return fmatch == FMATCH_OK;
 }
 EXPORT_SYMBOL_GPL(nf_osf_match);
+
+const char *nf_osf_find(const struct sk_buff *skb,
+			const struct list_head *nf_osf_fingers)
+{
+	const struct iphdr *ip = ip_hdr(skb);
+	const struct nf_osf_user_finger *f;
+	unsigned char opts[MAX_IPOPTLEN];
+	const struct nf_osf_finger *kf;
+	struct nf_osf_hdr_ctx ctx;
+	const struct tcphdr *tcp;
+	const char *genre = NULL;
+
+	memset(&ctx, 0, sizeof(ctx));
+
+	tcp = nf_osf_hdr_ctx_init(&ctx, skb, ip, opts);
+	if (!tcp)
+		return false;
+
+	list_for_each_entry_rcu(kf, &nf_osf_fingers[ctx.df], finger_entry) {
+		f = &kf->finger;
+		if (!nf_osf_match_one(skb, f, -1, &ctx))
+			continue;
+
+		genre = f->genre;
+		break;
+	}
+
+	return genre;
+}
+EXPORT_SYMBOL_GPL(nf_osf_find);
+
+static const struct nla_policy nfnl_osf_policy[OSF_ATTR_MAX + 1] = {
+	[OSF_ATTR_FINGER]	= { .len = sizeof(struct nf_osf_user_finger) },
+};
+
+static int nfnl_osf_add_callback(struct net *net, struct sock *ctnl,
+				 struct sk_buff *skb, const struct nlmsghdr *nlh,
+				 const struct nlattr * const osf_attrs[],
+				 struct netlink_ext_ack *extack)
+{
+	struct nf_osf_user_finger *f;
+	struct nf_osf_finger *kf = NULL, *sf;
+	int err = 0;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (!osf_attrs[OSF_ATTR_FINGER])
+		return -EINVAL;
+
+	if (!(nlh->nlmsg_flags & NLM_F_CREATE))
+		return -EINVAL;
+
+	f = nla_data(osf_attrs[OSF_ATTR_FINGER]);
+
+	kf = kmalloc(sizeof(struct nf_osf_finger), GFP_KERNEL);
+	if (!kf)
+		return -ENOMEM;
+
+	memcpy(&kf->finger, f, sizeof(struct nf_osf_user_finger));
+
+	list_for_each_entry(sf, &nf_osf_fingers[!!f->df], finger_entry) {
+		if (memcmp(&sf->finger, f, sizeof(struct nf_osf_user_finger)))
+			continue;
+
+		kfree(kf);
+		kf = NULL;
+
+		if (nlh->nlmsg_flags & NLM_F_EXCL)
+			err = -EEXIST;
+		break;
+	}
+
+	/*
+	 * We are protected by nfnl mutex.
+	 */
+	if (kf)
+		list_add_tail_rcu(&kf->finger_entry, &nf_osf_fingers[!!f->df]);
+
+	return err;
+}
+
+static int nfnl_osf_remove_callback(struct net *net, struct sock *ctnl,
+				    struct sk_buff *skb,
+				    const struct nlmsghdr *nlh,
+				    const struct nlattr * const osf_attrs[],
+				    struct netlink_ext_ack *extack)
+{
+	struct nf_osf_user_finger *f;
+	struct nf_osf_finger *sf;
+	int err = -ENOENT;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (!osf_attrs[OSF_ATTR_FINGER])
+		return -EINVAL;
+
+	f = nla_data(osf_attrs[OSF_ATTR_FINGER]);
+
+	list_for_each_entry(sf, &nf_osf_fingers[!!f->df], finger_entry) {
+		if (memcmp(&sf->finger, f, sizeof(struct nf_osf_user_finger)))
+			continue;
+
+		/*
+		 * We are protected by nfnl mutex.
+		 */
+		list_del_rcu(&sf->finger_entry);
+		kfree_rcu(sf, rcu_head);
+
+		err = 0;
+		break;
+	}
+
+	return err;
+}
+
+static const struct nfnl_callback nfnl_osf_callbacks[OSF_MSG_MAX] = {
+	[OSF_MSG_ADD]	= {
+		.call		= nfnl_osf_add_callback,
+		.attr_count	= OSF_ATTR_MAX,
+		.policy		= nfnl_osf_policy,
+	},
+	[OSF_MSG_REMOVE]	= {
+		.call		= nfnl_osf_remove_callback,
+		.attr_count	= OSF_ATTR_MAX,
+		.policy		= nfnl_osf_policy,
+	},
+};
+
+static const struct nfnetlink_subsystem nfnl_osf_subsys = {
+	.name			= "osf",
+	.subsys_id		= NFNL_SUBSYS_OSF,
+	.cb_count		= OSF_MSG_MAX,
+	.cb			= nfnl_osf_callbacks,
+};
+
+static int __init nfnl_osf_init(void)
+{
+	int err = -EINVAL;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(nf_osf_fingers); ++i)
+		INIT_LIST_HEAD(&nf_osf_fingers[i]);
+
+	err = nfnetlink_subsys_register(&nfnl_osf_subsys);
+	if (err < 0) {
+		pr_err("Failed to register OSF nsfnetlink helper (%d)\n", err);
+		goto err_out_exit;
+	}
+	return 0;
+
+err_out_exit:
+	return err;
+}
+
+static void __exit nfnl_osf_fini(void)
+{
+	struct nf_osf_finger *f;
+	int i;
+
+	nfnetlink_subsys_unregister(&nfnl_osf_subsys);
+
+	rcu_read_lock();
+	for (i = 0; i < ARRAY_SIZE(nf_osf_fingers); ++i) {
+		list_for_each_entry_rcu(f, &nf_osf_fingers[i], finger_entry) {
+			list_del_rcu(&f->finger_entry);
+			kfree_rcu(f, rcu_head);
+		}
+	}
+	rcu_read_unlock();
+
+	rcu_barrier();
+}
+
+module_init(nfnl_osf_init);
+module_exit(nfnl_osf_fini);
 
 MODULE_LICENSE("GPL");

net/netfilter/nf_tables_api.c

···
 static int nft_chain_parse_hook(struct net *net,
 				const struct nlattr * const nla[],
 				struct nft_chain_hook *hook, u8 family,
-				bool create)
+				bool autoload)
 {
 	struct nlattr *ha[NFTA_HOOK_MAX + 1];
 	const struct nft_chain_type *type;
···
 	type = chain_type[family][NFT_CHAIN_T_DEFAULT];
 	if (nla[NFTA_CHAIN_TYPE]) {
 		type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
-						   family, create);
+						   family, autoload);
 		if (IS_ERR(type))
 			return PTR_ERR(type);
 	}
···
 }
 
 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
-			      u8 policy, bool create)
+			      u8 policy)
 {
 	const struct nlattr * const *nla = ctx->nla;
 	struct nft_table *table = ctx->table;
···
 		struct nft_chain_hook hook;
 		struct nf_hook_ops *ops;
 
-		err = nft_chain_parse_hook(net, nla, &hook, family, create);
+		err = nft_chain_parse_hook(net, nla, &hook, family, true);
 		if (err < 0)
 			return err;
 
···
 	return err;
 }
 
-static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
-			      bool create)
+static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
 {
 	const struct nlattr * const *nla = ctx->nla;
 	struct nft_table *table = ctx->table;
···
 			return -EBUSY;
 
 		err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
-					   create);
+					   false);
 		if (err < 0)
 			return err;
 
···
 	u8 policy = NF_ACCEPT;
 	struct nft_ctx ctx;
 	u64 handle = 0;
-	bool create;
-
-	create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
 
 	lockdep_assert_held(&net->nft.commit_mutex);
 
···
 		if (nlh->nlmsg_flags & NLM_F_REPLACE)
 			return -EOPNOTSUPP;
 
-		return nf_tables_updchain(&ctx, genmask, policy, create);
+		return nf_tables_updchain(&ctx, genmask, policy);
 	}
 
-	return nf_tables_addchain(&ctx, family, genmask, policy, create);
+	return nf_tables_addchain(&ctx, family, genmask, policy);
 }
 
 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
···
 	struct nlattr *tmp;
 	unsigned int size, i, n, ulen = 0, usize = 0;
 	int err, rem;
-	bool create;
 	u64 handle, pos_handle;
 
 	lockdep_assert_held(&net->nft.commit_mutex);
-
-	create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
 
 	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
 	if (IS_ERR(table)) {
···
 		else
 			return -EOPNOTSUPP;
 	} else {
-		if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
+		if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
+		    nlh->nlmsg_flags & NLM_F_REPLACE)
 			return -EINVAL;
 		handle = nf_tables_alloc_handle(table);
 
···
 	struct nft_ctx ctx;
 	char *name;
 	unsigned int size;
-	bool create;
 	u64 timeout;
 	u32 ktype, dtype, flags, policy, gc_int, objtype;
 	struct nft_set_desc desc;
···
 		if (err < 0)
 			return err;
 	}
-
-	create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
 
 	table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
 	if (IS_ERR(table)) {
···
 			    const struct nlattr *attr)
 {
 	struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
-	const struct nft_set_ext *ext;
 	struct nft_data_desc desc;
 	struct nft_set_elem elem;
 	struct sk_buff *skb;
···
 		return PTR_ERR(priv);
 
 	elem.priv = priv;
-	ext = nft_set_elem_ext(set, &elem);
 
 	err = -ENOMEM;
 	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
···
 	if (!net)
 		return 0;
 
-	nfnl_lock(NFNL_SUBSYS_NFTABLES);
+	mutex_lock(&net->nft.commit_mutex);
 	list_for_each_entry(table, &net->nft.tables, list) {
 		list_for_each_entry(flowtable, &table->flowtables, list) {
 			nft_flowtable_event(event, dev, flowtable);
 		}
 	}
-	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
+	mutex_unlock(&net->nft.commit_mutex);
 	put_net(net);
 	return NOTIFY_DONE;
 }

net/netfilter/nf_tables_core.c

···
 	struct nft_rule	*const *rules;
 };
 
+static void expr_call_ops_eval(const struct nft_expr *expr,
+			       struct nft_regs *regs,
+			       struct nft_pktinfo *pkt)
+{
+	unsigned long e = (unsigned long)expr->ops->eval;
+
+	if (e == (unsigned long)nft_meta_get_eval)
+		nft_meta_get_eval(expr, regs, pkt);
+	else if (e == (unsigned long)nft_lookup_eval)
+		nft_lookup_eval(expr, regs, pkt);
+	else
+		expr->ops->eval(expr, regs, pkt);
+}
+
 unsigned int
 nft_do_chain(struct nft_pktinfo *pkt, void *priv)
 {
···
 				nft_cmp_fast_eval(expr, &regs);
 			else if (expr->ops != &nft_payload_fast_ops ||
 				 !nft_payload_fast_eval(expr, &regs, pkt))
-				expr->ops->eval(expr, &regs, pkt);
+				expr_call_ops_eval(expr, &regs, pkt);
 
 			if (regs.verdict.code != NFT_CONTINUE)
 				break;

net/netfilter/nfnetlink_cttimeout.c

···
 	return err;
 }
 
-#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 static struct ctnl_timeout *
 ctnl_timeout_find_get(struct net *net, const char *name)
 {
···
 
 	module_put(THIS_MODULE);
 }
-#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
 
 static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = {
 	[IPCTNL_MSG_TIMEOUT_NEW]	= { .call = cttimeout_new_timeout,
···
 			"nfnetlink.\n");
 		goto err_out;
 	}
-#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 	RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get);
 	RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put);
-#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
 	return 0;
 
 err_out:
···
 	nfnetlink_subsys_unregister(&cttimeout_subsys);
 
 	unregister_pernet_subsys(&cttimeout_ops);
-#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 	RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL);
 	RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL);
 	synchronize_rcu();
-#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
 }
 
 module_init(cttimeout_init);

net/netfilter/nft_lookup.c

···
 	struct nft_set_binding		binding;
 };
 
-static void nft_lookup_eval(const struct nft_expr *expr,
-			    struct nft_regs *regs,
-			    const struct nft_pktinfo *pkt)
+void nft_lookup_eval(const struct nft_expr *expr,
+		     struct nft_regs *regs,
+		     const struct nft_pktinfo *pkt)
 {
 	const struct nft_lookup *priv = nft_expr_priv(expr);
 	const struct nft_set *set = priv->set;

net/netfilter/nft_meta.c

···
 #include "../bridge/br_private.h"
 #endif
 
-static void nft_meta_get_eval(const struct nft_expr *expr,
-			      struct nft_regs *regs,
-			      const struct nft_pktinfo *pkt)
+void nft_meta_get_eval(const struct nft_expr *expr,
+		       struct nft_regs *regs,
+		       const struct nft_pktinfo *pkt)
 {
 	const struct nft_meta *priv = nft_expr_priv(expr);
 	const struct sk_buff *skb = pkt->skb;

net/netfilter/nft_numgen.c

···
 	priv->map = nft_set_lookup_global(ctx->net, ctx->table,
 					  tb[NFTA_NG_SET_NAME],
 					  tb[NFTA_NG_SET_ID], genmask);
-	if (IS_ERR(priv->map))
-		return PTR_ERR(priv->map);
 
-	return 0;
+	return PTR_ERR_OR_ZERO(priv->map);
 }
 
 static int nft_ng_random_dump(struct sk_buff *skb, const struct nft_expr *expr)

net/netfilter/nft_osf.c

···
+#include <net/ip.h>
+#include <net/tcp.h>
+
+#include <net/netfilter/nf_tables.h>
+#include <linux/netfilter/nfnetlink_osf.h>
+
+#define OSF_GENRE_SIZE		32
+
+struct nft_osf {
+	enum nft_registers	dreg:8;
+};
+
+static const struct nla_policy nft_osf_policy[NFTA_OSF_MAX + 1] = {
+	[NFTA_OSF_DREG]		= { .type = NLA_U32 },
+};
+
+static void nft_osf_eval(const struct nft_expr *expr, struct nft_regs *regs,
+			 const struct nft_pktinfo *pkt)
+{
+	struct nft_osf *priv = nft_expr_priv(expr);
+	u32 *dest = &regs->data[priv->dreg];
+	struct sk_buff *skb = pkt->skb;
+	const struct tcphdr *tcp;
+	struct tcphdr _tcph;
+	const char *os_name;
+
+	tcp = skb_header_pointer(skb, ip_hdrlen(skb),
+				 sizeof(struct tcphdr), &_tcph);
+	if (!tcp) {
+		regs->verdict.code = NFT_BREAK;
+		return;
+	}
+	if (!tcp->syn) {
+		regs->verdict.code = NFT_BREAK;
+		return;
+	}
+
+	os_name = nf_osf_find(skb, nf_osf_fingers);
+	if (!os_name)
+		strncpy((char *)dest, "unknown", IFNAMSIZ);
+	else
+		strncpy((char *)dest, os_name, IFNAMSIZ);
+}
+
+static int nft_osf_init(const struct nft_ctx *ctx,
+			const struct nft_expr *expr,
+			const struct nlattr * const tb[])
+{
+	struct nft_osf *priv = nft_expr_priv(expr);
+	int err;
+
+	priv->dreg = nft_parse_register(tb[NFTA_OSF_DREG]);
+	err = nft_validate_register_store(ctx, priv->dreg, NULL,
+					  NFTA_DATA_VALUE, OSF_GENRE_SIZE);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+static int nft_osf_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+	const struct nft_osf *priv = nft_expr_priv(expr);
+
+	if (nft_dump_register(skb, NFTA_OSF_DREG, priv->dreg))
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static struct nft_expr_type nft_osf_type;
+static const struct nft_expr_ops nft_osf_op = {
+	.eval		= nft_osf_eval,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_osf)),
+	.init		= nft_osf_init,
+	.dump		= nft_osf_dump,
+	.type		= &nft_osf_type,
+};
+
+static struct nft_expr_type nft_osf_type __read_mostly = {
+	.ops		= &nft_osf_op,
+	.name		= "osf",
+	.owner		= THIS_MODULE,
+	.policy		= nft_osf_policy,
+	.maxattr	= NFTA_OSF_MAX,
+};
+
+static int __init nft_osf_module_init(void)
+{
+	return nft_register_expr(&nft_osf_type);
+}
+
+static void __exit nft_osf_module_exit(void)
+{
+	return nft_unregister_expr(&nft_osf_type);
+}
+
+module_init(nft_osf_module_init);
+module_exit(nft_osf_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Fernando Fernandez <[e-mail]>");
+MODULE_ALIAS_NFT_EXPR("osf");

net/netfilter/nft_tproxy.c

···
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/module.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nf_tproxy.h>
+#include <net/inet_sock.h>
+#include <net/tcp.h>
+#include <linux/if_ether.h>
+#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
+#endif
+
+struct nft_tproxy {
+	enum nft_registers      sreg_addr:8;
+	enum nft_registers      sreg_port:8;
+	u8			family;
+};
+
+static void nft_tproxy_eval_v4(const struct nft_expr *expr,
+			       struct nft_regs *regs,
+			       const struct nft_pktinfo *pkt)
+{
+	const struct nft_tproxy *priv = nft_expr_priv(expr);
+	struct sk_buff *skb = pkt->skb;
+	const struct iphdr *iph = ip_hdr(skb);
+	struct udphdr _hdr, *hp;
+	__be32 taddr = 0;
+	__be16 tport = 0;
+	struct sock *sk;
+
+	hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr);
+	if (!hp) {
+		regs->verdict.code = NFT_BREAK;
+		return;
+	}
+
+	/* check if there's an ongoing connection on the packet addresses, this
+	 * happens if the redirect already happened and the current packet
+	 * belongs to an already established connection
+	 */
+	sk = nf_tproxy_get_sock_v4(nft_net(pkt), skb, iph->protocol,
+				   iph->saddr, iph->daddr,
+				   hp->source, hp->dest,
+				   skb->dev, NF_TPROXY_LOOKUP_ESTABLISHED);
+
+	if (priv->sreg_addr)
+		taddr = regs->data[priv->sreg_addr];
+	taddr = nf_tproxy_laddr4(skb, taddr, iph->daddr);
+
+	if (priv->sreg_port)
+		tport = regs->data[priv->sreg_port];
+	if (!tport)
+		tport = hp->dest;
+
+	/* UDP has no TCP_TIME_WAIT state, so we never enter here */
+	if (sk && sk->sk_state == TCP_TIME_WAIT) {
+		/* reopening a TIME_WAIT connection needs special handling */
+		sk = nf_tproxy_handle_time_wait4(nft_net(pkt), skb, taddr, tport, sk);
+	} else if (!sk) {
+		/* no, there's no established connection, check if
+		 * there's a listener on the redirected addr/port
+		 */
+		sk = nf_tproxy_get_sock_v4(nft_net(pkt), skb, iph->protocol,
+					   iph->saddr, taddr,
+					   hp->source, tport,
+					   skb->dev, NF_TPROXY_LOOKUP_LISTENER);
+	}
+
+	if (sk && nf_tproxy_sk_is_transparent(sk))
+		nf_tproxy_assign_sock(skb, sk);
+	else
+		regs->verdict.code = NFT_BREAK;
+}
+
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+static void nft_tproxy_eval_v6(const struct nft_expr *expr,
+			       struct nft_regs *regs,
+			       const struct nft_pktinfo *pkt)
+{
+	const struct nft_tproxy *priv = nft_expr_priv(expr);
+	struct sk_buff *skb = pkt->skb;
+	const struct ipv6hdr *iph = ipv6_hdr(skb);
+	struct in6_addr taddr = {0};
+	int thoff = pkt->xt.thoff;
+	struct udphdr _hdr, *hp;
+	__be16 tport = 0;
+	struct sock *sk;
+	int l4proto;
+
+	if (!pkt->tprot_set) {
+		regs->verdict.code = NFT_BREAK;
+		return;
+	}
+	l4proto = pkt->tprot;
+
+	hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr);
+	if (hp == NULL) {
+		regs->verdict.code = NFT_BREAK;
+		return;
+	}
+
+	/* check if there's an ongoing connection on the packet addresses, this
+	 * happens if the redirect already happened and the current packet
+	 * belongs to an already established connection
+	 */
+	sk = nf_tproxy_get_sock_v6(nft_net(pkt), skb, thoff, l4proto,
+				   &iph->saddr, &iph->daddr,
+				   hp->source, hp->dest,
+				   nft_in(pkt), NF_TPROXY_LOOKUP_ESTABLISHED);
+
+	if (priv->sreg_addr)
+		memcpy(&taddr, &regs->data[priv->sreg_addr], sizeof(taddr));
+	taddr = *nf_tproxy_laddr6(skb, &taddr, &iph->daddr);
+
+	if (priv->sreg_port)
+		tport = regs->data[priv->sreg_port];
+	if (!tport)
+		tport = hp->dest;
+
+	/* UDP has no TCP_TIME_WAIT state, so we never enter here */
+	if (sk && sk->sk_state == TCP_TIME_WAIT) {
+		/* reopening a TIME_WAIT connection needs special handling */
+		sk = nf_tproxy_handle_time_wait6(skb, l4proto, thoff,
+						 nft_net(pkt),
+						 &taddr,
+						 tport,
+						 sk);
+	} else if (!sk) {
+		/* no there's no established connection, check if
+		 * there's a listener on the redirected addr/port
+		 */
+		sk = nf_tproxy_get_sock_v6(nft_net(pkt), skb, thoff,
+					   l4proto, &iph->saddr, &taddr,
+					   hp->source, tport,
+					   nft_in(pkt), NF_TPROXY_LOOKUP_LISTENER);
+	}
+
+	/* NOTE: assign_sock consumes our sk reference */
+	if (sk && nf_tproxy_sk_is_transparent(sk))
+		nf_tproxy_assign_sock(skb, sk);
+	else
+		regs->verdict.code = NFT_BREAK;
+}
+#endif
+
+static void nft_tproxy_eval(const struct nft_expr *expr,
+			    struct nft_regs *regs,
+			    const struct nft_pktinfo *pkt)
+{
+	const struct nft_tproxy *priv = nft_expr_priv(expr);
+
+	switch (nft_pf(pkt)) {
+	case NFPROTO_IPV4:
+		switch (priv->family) {
+		case NFPROTO_IPV4:
+		case NFPROTO_UNSPEC:
+			nft_tproxy_eval_v4(expr, regs, pkt);
+			return;
+		}
+		break;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+	case NFPROTO_IPV6:
+		switch (priv->family) {
+		case NFPROTO_IPV6:
+		case NFPROTO_UNSPEC:
+			nft_tproxy_eval_v6(expr, regs, pkt);
+			return;
+		}
+#endif
+	}
+	regs->verdict.code = NFT_BREAK;
+}
+
+static const struct nla_policy nft_tproxy_policy[NFTA_TPROXY_MAX + 1] = {
+	[NFTA_TPROXY_FAMILY]   = { .type = NLA_U32 },
+	[NFTA_TPROXY_REG_ADDR] = { .type = NLA_U32 },
+	[NFTA_TPROXY_REG_PORT] = { .type = NLA_U32 },
+};
+
+static int nft_tproxy_init(const struct nft_ctx *ctx,
+			   const struct nft_expr *expr,
+			   const struct nlattr * const tb[])
+{
+	struct nft_tproxy *priv = nft_expr_priv(expr);
+	unsigned int alen = 0;
+	int err;
+
+	if (!tb[NFTA_TPROXY_FAMILY] ||
+	    (!tb[NFTA_TPROXY_REG_ADDR] && !tb[NFTA_TPROXY_REG_PORT]))
+		return -EINVAL;
+
+	priv->family = ntohl(nla_get_be32(tb[NFTA_TPROXY_FAMILY]));
+
+	switch (ctx->family) {
+	case NFPROTO_IPV4:
+		if (priv->family != NFPROTO_IPV4)
+			return -EINVAL;
+		break;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+	case NFPROTO_IPV6:
+		if (priv->family != NFPROTO_IPV6)
+			return -EINVAL;
+		break;
+#endif
+	case NFPROTO_INET:
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	/* Address is specified but the rule family is not set accordingly */
+	if (priv->family == NFPROTO_UNSPEC && tb[NFTA_TPROXY_REG_ADDR])
+		return -EINVAL;
+
+	switch (priv->family) {
+	case NFPROTO_IPV4:
+		alen = FIELD_SIZEOF(union nf_inet_addr, in);
+		err = nf_defrag_ipv4_enable(ctx->net);
+		if (err)
+			return err;
+		break;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+	case NFPROTO_IPV6:
+		alen = FIELD_SIZEOF(union nf_inet_addr, in6);
+		err = nf_defrag_ipv6_enable(ctx->net);
+		if (err)
+			return err;
+		break;
+#endif
+	case NFPROTO_UNSPEC:
+		/* No address is specified here */
+		err = nf_defrag_ipv4_enable(ctx->net);
+		if (err)
+			return err;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+		err = nf_defrag_ipv6_enable(ctx->net);
+		if (err)
+			return err;
+#endif
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	if (tb[NFTA_TPROXY_REG_ADDR]) {
+		priv->sreg_addr = nft_parse_register(tb[NFTA_TPROXY_REG_ADDR]);
+		err = nft_validate_register_load(priv->sreg_addr, alen);
+		if (err < 0)
+			return err;
+	}
+
+	if (tb[NFTA_TPROXY_REG_PORT]) {
+		priv->sreg_port = nft_parse_register(tb[NFTA_TPROXY_REG_PORT]);
+		err = nft_validate_register_load(priv->sreg_port, sizeof(u16));
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
+static int nft_tproxy_dump(struct sk_buff *skb,
+			   const struct nft_expr *expr)
+{
+	const struct nft_tproxy *priv = nft_expr_priv(expr);
+
+	if (nla_put_be32(skb, NFTA_TPROXY_FAMILY, htonl(priv->family)))
+		return -1;
+
+	if (priv->sreg_addr &&
+	    nft_dump_register(skb, NFTA_TPROXY_REG_ADDR, priv->sreg_addr))
+		return -1;
+
+	if (priv->sreg_port &&
+	    nft_dump_register(skb, NFTA_TPROXY_REG_PORT, priv->sreg_port))
+			return -1;
+
+	return 0;
+}
+
+static struct nft_expr_type nft_tproxy_type;
+static const struct nft_expr_ops nft_tproxy_ops = {
+	.type		= &nft_tproxy_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_tproxy)),
+	.eval		= nft_tproxy_eval,
+	.init		= nft_tproxy_init,
+	.dump		= nft_tproxy_dump,
+};
+
+static struct nft_expr_type nft_tproxy_type __read_mostly = {
+	.name		= "tproxy",
+	.ops		= &nft_tproxy_ops,
+	.policy		= nft_tproxy_policy,
+	.maxattr	= NFTA_TPROXY_MAX,
+	.owner		= THIS_MODULE,
+};
+
+static int __init nft_tproxy_module_init(void)
+{
+	return nft_register_expr(&nft_tproxy_type);
+}
+
+static void __exit nft_tproxy_module_exit(void)
+{
+	nft_unregister_expr(&nft_tproxy_type);
+}
+
+module_init(nft_tproxy_module_init);
+module_exit(nft_tproxy_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Máté Eckl");
+MODULE_DESCRIPTION("nf_tables tproxy support module");
+MODULE_ALIAS_NFT_EXPR("tproxy");

net/netfilter/nft_tunnel.c

···
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/seqlock.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/dst_metadata.h>
+#include <net/ip_tunnels.h>
+#include <net/vxlan.h>
+#include <net/erspan.h>
+
+struct nft_tunnel {
+	enum nft_tunnel_keys	key:8;
+	enum nft_registers	dreg:8;
+};
+
+static void nft_tunnel_get_eval(const struct nft_expr *expr,
+				struct nft_regs *regs,
+				const struct nft_pktinfo *pkt)
+{
+	const struct nft_tunnel *priv = nft_expr_priv(expr);
+	u32 *dest = &regs->data[priv->dreg];
+	struct ip_tunnel_info *tun_info;
+
+	tun_info = skb_tunnel_info(pkt->skb);
+
+	switch (priv->key) {
+	case NFT_TUNNEL_PATH:
+		nft_reg_store8(dest, !!tun_info);
+		break;
+	case NFT_TUNNEL_ID:
+		if (!tun_info) {
+			regs->verdict.code = NFT_BREAK;
+			return;
+		}
+		*dest = ntohl(tunnel_id_to_key32(tun_info->key.tun_id));
+		break;
+	default:
+		WARN_ON(1);
+		regs->verdict.code = NFT_BREAK;
+	}
+}
+
+static const struct nla_policy nft_tunnel_policy[NFTA_TUNNEL_MAX + 1] = {
+	[NFTA_TUNNEL_KEY]	= { .type = NLA_U32 },
+	[NFTA_TUNNEL_DREG]	= { .type = NLA_U32 },
+};
+
+static int nft_tunnel_get_init(const struct nft_ctx *ctx,
+			       const struct nft_expr *expr,
+			       const struct nlattr * const tb[])
+{
+	struct nft_tunnel *priv = nft_expr_priv(expr);
+	u32 len;
+
+	if (!tb[NFTA_TUNNEL_KEY] &&
+	    !tb[NFTA_TUNNEL_DREG])
+		return -EINVAL;
+
+	priv->key = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY]));
+	switch (priv->key) {
+	case NFT_TUNNEL_PATH:
+		len = sizeof(u8);
+		break;
+	case NFT_TUNNEL_ID:
+		len = sizeof(u32);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	priv->dreg = nft_parse_register(tb[NFTA_TUNNEL_DREG]);
+
+	return nft_validate_register_store(ctx, priv->dreg, NULL,
+					   NFT_DATA_VALUE, len);
+}
+
+static int nft_tunnel_get_dump(struct sk_buff *skb,
+			       const struct nft_expr *expr)
+{
+	const struct nft_tunnel *priv = nft_expr_priv(expr);
+
+	if (nla_put_be32(skb, NFTA_TUNNEL_KEY, htonl(priv->key)))
+		goto nla_put_failure;
+	if (nft_dump_register(skb, NFTA_TUNNEL_DREG, priv->dreg))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static struct nft_expr_type nft_tunnel_type;
+static const struct nft_expr_ops nft_tunnel_get_ops = {
+	.type		= &nft_tunnel_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_tunnel)),
+	.eval		= nft_tunnel_get_eval,
+	.init		= nft_tunnel_get_init,
+	.dump		= nft_tunnel_get_dump,
+};
+
+static struct nft_expr_type nft_tunnel_type __read_mostly = {
+	.name		= "tunnel",
+	.ops		= &nft_tunnel_get_ops,
+	.policy		= nft_tunnel_policy,
+	.maxattr	= NFTA_TUNNEL_MAX,
+	.owner		= THIS_MODULE,
+};
+
+struct nft_tunnel_opts {
+	union {
+		struct vxlan_metadata	vxlan;
+		struct erspan_metadata	erspan;
+	} u;
+	u32	len;
+	__be16	flags;
+};
+
+struct nft_tunnel_obj {
+	struct metadata_dst	*md;
+	struct nft_tunnel_opts	opts;
+};
+
+static const struct nla_policy nft_tunnel_ip_policy[NFTA_TUNNEL_KEY_IP_MAX + 1] = {
+	[NFTA_TUNNEL_KEY_IP_SRC]	= { .type = NLA_U32 },
+	[NFTA_TUNNEL_KEY_IP_DST]	= { .type = NLA_U32 },
+};
+
+static int nft_tunnel_obj_ip_init(const struct nft_ctx *ctx,
+				  const struct nlattr *attr,
+				  struct ip_tunnel_info *info)
+{
+	struct nlattr *tb[NFTA_TUNNEL_KEY_IP_MAX + 1];
+	int err;
+
+	err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_IP_MAX, attr,
+			       nft_tunnel_ip_policy, NULL);
+	if (err < 0)
+		return err;
+
+	if (!tb[NFTA_TUNNEL_KEY_IP_DST])
+		return -EINVAL;
+
+	if (tb[NFTA_TUNNEL_KEY_IP_SRC])
+		info->key.u.ipv4.src = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_SRC]);
+	if (tb[NFTA_TUNNEL_KEY_IP_DST])
+		info->key.u.ipv4.dst = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_DST]);
+
+	return 0;
+}
+
+static const struct nla_policy nft_tunnel_ip6_policy[NFTA_TUNNEL_KEY_IP6_MAX + 1] = {
+	[NFTA_TUNNEL_KEY_IP6_SRC]	= { .len = sizeof(struct in6_addr), },
+	[NFTA_TUNNEL_KEY_IP6_DST]	= { .len = sizeof(struct in6_addr), },
+	[NFTA_TUNNEL_KEY_IP6_FLOWLABEL]	= { .type = NLA_U32, }
+};
+
+static int nft_tunnel_obj_ip6_init(const struct nft_ctx *ctx,
+				   const struct nlattr *attr,
+				   struct ip_tunnel_info *info)
+{
+	struct nlattr *tb[NFTA_TUNNEL_KEY_IP6_MAX + 1];
+	int err;
+
+	err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_IP6_MAX, attr,
+			       nft_tunnel_ip6_policy, NULL);
+	if (err < 0)
+		return err;
+
+	if (!tb[NFTA_TUNNEL_KEY_IP6_DST])
+		return -EINVAL;
+
+	if (tb[NFTA_TUNNEL_KEY_IP6_SRC]) {
+		memcpy(&info->key.u.ipv6.src,
+		       nla_data(tb[NFTA_TUNNEL_KEY_IP6_SRC]),
+		       sizeof(struct in6_addr));
+	}
+	if (tb[NFTA_TUNNEL_KEY_IP6_DST]) {
+		memcpy(&info->key.u.ipv6.dst,
+		       nla_data(tb[NFTA_TUNNEL_KEY_IP6_DST]),
+		       sizeof(struct in6_addr));
+	}
+	if (tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL])
+		info->key.label = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL]);
+
+	info->mode |= IP_TUNNEL_INFO_IPV6;
+
+	return 0;
+}
+
+static const struct nla_policy nft_tunnel_opts_vxlan_policy[NFTA_TUNNEL_KEY_VXLAN_MAX + 1] = {
+	[NFTA_TUNNEL_KEY_VXLAN_GBP]	= { .type = NLA_U32 },
+};
+
+static int nft_tunnel_obj_vxlan_init(const struct nlattr *attr,
+				     struct nft_tunnel_opts *opts)
+{
+	struct nlattr *tb[NFTA_TUNNEL_KEY_VXLAN_MAX + 1];
+	int err;
+
+	err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_VXLAN_MAX, attr,
+			       nft_tunnel_opts_vxlan_policy, NULL);
+	if (err < 0)
+		return err;
+
+	if (!tb[NFTA_TUNNEL_KEY_VXLAN_GBP])
+		return -EINVAL;
+
+	opts->u.vxlan.gbp = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_VXLAN_GBP]));
+
+	opts->len	= sizeof(struct vxlan_metadata);
+	opts->flags	= TUNNEL_VXLAN_OPT;
+
+	return 0;
+}
+
+static const struct nla_policy nft_tunnel_opts_erspan_policy[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1] = {
+	[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]	= { .type = NLA_U32 },
+	[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]	= { .type = NLA_U8 },
+	[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]	= { .type = NLA_U8 },
+};
+
+static int nft_tunnel_obj_erspan_init(const struct nlattr *attr,
+				      struct nft_tunnel_opts *opts)
+{
+	struct nlattr *tb[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1];
+	uint8_t hwid, dir;
+	int err, version;
+
+	err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_ERSPAN_MAX, attr,
+			       nft_tunnel_opts_erspan_policy, NULL);
+	if (err < 0)
+		return err;
+
+	version = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION]));
+	switch (version) {
+	case ERSPAN_VERSION:
+		if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX])
+			return -EINVAL;
+
+		opts->u.erspan.u.index =
+			nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]);
+		break;
+	case ERSPAN_VERSION2:
+		if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] ||
+		    !tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID])
+			return -EINVAL;
+
+		hwid = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]);
+		dir = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]);
+
+		set_hwid(&opts->u.erspan.u.md2, hwid);
+		opts->u.erspan.u.md2.dir = dir;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	opts->u.erspan.version = version;
+
+	opts->len	= sizeof(struct erspan_metadata);
+	opts->flags	= TUNNEL_ERSPAN_OPT;
+
+	return 0;
+}
+
+static const struct nla_policy nft_tunnel_opts_policy[NFTA_TUNNEL_KEY_OPTS_MAX + 1] = {
+	[NFTA_TUNNEL_KEY_OPTS_VXLAN]	= { .type = NLA_NESTED, },
+	[NFTA_TUNNEL_KEY_OPTS_ERSPAN]	= { .type = NLA_NESTED, },
+};
+
+static int nft_tunnel_obj_opts_init(const struct nft_ctx *ctx,
+				    const struct nlattr *attr,
+				    struct ip_tunnel_info *info,
+				    struct nft_tunnel_opts *opts)
+{
+	struct nlattr *tb[NFTA_TUNNEL_KEY_OPTS_MAX + 1];
+	int err;
+
+	err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_OPTS_MAX, attr,
+			       nft_tunnel_opts_policy, NULL);
+	if (err < 0)
+		return err;
+
+	if (tb[NFTA_TUNNEL_KEY_OPTS_VXLAN]) {
+		err = nft_tunnel_obj_vxlan_init(tb[NFTA_TUNNEL_KEY_OPTS_VXLAN],
+						opts);
+	} else if (tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN]) {
+		err = nft_tunnel_obj_erspan_init(tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN],
+						 opts);
+	} else {
+		return -EOPNOTSUPP;
+	}
+
+	return err;
+}
+
+static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] = {
+	[NFTA_TUNNEL_KEY_IP]	= { .type = NLA_NESTED, },
+	[NFTA_TUNNEL_KEY_IP6]	= { .type = NLA_NESTED, },
+	[NFTA_TUNNEL_KEY_ID]	= { .type = NLA_U32, },
+	[NFTA_TUNNEL_KEY_FLAGS]	= { .type = NLA_U32, },
+	[NFTA_TUNNEL_KEY_TOS]	= { .type = NLA_U8, },
+	[NFTA_TUNNEL_KEY_TTL]	= { .type = NLA_U8, },
+	[NFTA_TUNNEL_KEY_OPTS]	= { .type = NLA_NESTED, },
+};
+
+static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
+			       const struct nlattr * const tb[],
+			       struct nft_object *obj)
+{
+	struct nft_tunnel_obj *priv = nft_obj_data(obj);
+	struct ip_tunnel_info info;
+	struct metadata_dst *md;
+	int err;
+
+	if (!tb[NFTA_TUNNEL_KEY_ID])
+		return -EINVAL;
+
+	memset(&info, 0, sizeof(info));
+	info.mode		= IP_TUNNEL_INFO_TX;
+	info.key.tun_id		= key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID]));
+	info.key.tun_flags	= TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
+
+	if (tb[NFTA_TUNNEL_KEY_IP]) {
+		err = nft_tunnel_obj_ip_init(ctx, tb[NFTA_TUNNEL_KEY_IP], &info);
+		if (err < 0)
+			return err;
+	} else if (tb[NFTA_TUNNEL_KEY_IP6]) {
+		err = nft_tunnel_obj_ip6_init(ctx, tb[NFTA_TUNNEL_KEY_IP6], &info);
+		if (err < 0)
+			return err;
+	} else {
+		return -EINVAL;
+	}
+
+	if (tb[NFTA_TUNNEL_KEY_SPORT]) {
+		info.key.tp_src = nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]);
+	}
+	if (tb[NFTA_TUNNEL_KEY_DPORT]) {
+		info.key.tp_dst = nla_get_be16(tb[NFTA_TUNNEL_KEY_DPORT]);
+	}
+
+	if (tb[NFTA_TUNNEL_KEY_FLAGS]) {
+		u32 tun_flags;
+
+		tun_flags = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_FLAGS]));
+		if (tun_flags & ~NFT_TUNNEL_F_MASK)
+			return -EOPNOTSUPP;
+
+		if (tun_flags & NFT_TUNNEL_F_ZERO_CSUM_TX)
+			info.key.tun_flags &= ~TUNNEL_CSUM;
+		if (tun_flags & NFT_TUNNEL_F_DONT_FRAGMENT)
+			info.key.tun_flags |= TUNNEL_DONT_FRAGMENT;
+		if (tun_flags & NFT_TUNNEL_F_SEQ_NUMBER)
+			info.key.tun_flags |= TUNNEL_SEQ;
+	}
+	if (tb[NFTA_TUNNEL_KEY_TOS])
+		info.key.tos = nla_get_u8(tb[NFTA_TUNNEL_KEY_TOS]);
+	if (tb[NFTA_TUNNEL_KEY_TTL])
+		info.key.ttl = nla_get_u8(tb[NFTA_TUNNEL_KEY_TTL]);
+	else
+		info.key.ttl = U8_MAX;
+
+	if (tb[NFTA_TUNNEL_KEY_OPTS]) {
+		err = nft_tunnel_obj_opts_init(ctx, tb[NFTA_TUNNEL_KEY_OPTS],
+					       &info, &priv->opts);
+		if (err < 0)
+			return err;
+	}
+
+	md = metadata_dst_alloc(priv->opts.len, METADATA_IP_TUNNEL, GFP_KERNEL);
+	if (!md)
+		return -ENOMEM;
+
+	memcpy(&md->u.tun_info, &info, sizeof(info));
+	ip_tunnel_info_opts_set(&md->u.tun_info, &priv->opts.u, priv->opts.len,
+				priv->opts.flags);
+	priv->md = md;
+
+	return 0;
+}
+
+static inline void nft_tunnel_obj_eval(struct nft_object *obj,
+				       struct nft_regs *regs,
+				       const struct nft_pktinfo *pkt)
+{
+	struct nft_tunnel_obj *priv = nft_obj_data(obj);
+	struct sk_buff *skb = pkt->skb;
+
+	skb_dst_drop(skb);
+	dst_hold((struct dst_entry *) priv->md);
+	skb_dst_set(skb, (struct dst_entry *) priv->md);
+}
+
+static int nft_tunnel_ip_dump(struct sk_buff *skb, struct ip_tunnel_info *info)
+{
+	struct nlattr *nest;
+
+	if (info->mode & IP_TUNNEL_INFO_IPV6) {
+		nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_IP6);
+		if (!nest)
+			return -1;
+
+		if (nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_SRC, &info->key.u.ipv6.src) < 0 ||
+		    nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_DST, &info->key.u.ipv6.dst) < 0 ||
+		    nla_put_be32(skb, NFTA_TUNNEL_KEY_IP6_FLOWLABEL, info->key.label))
+			return -1;
+
+		nla_nest_end(skb, nest);
+	} else {
+		nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_IP);
+		if (!nest)
+			return -1;
+
+		if (nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_SRC, info->key.u.ipv4.src) < 0 ||
+		    nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_DST, info->key.u.ipv4.dst) < 0)
+			return -1;
+
+		nla_nest_end(skb, nest);
+	}
+
+	return 0;
+}
+
+static int nft_tunnel_opts_dump(struct sk_buff *skb,
+				struct nft_tunnel_obj *priv)
+{
+	struct nft_tunnel_opts *opts = &priv->opts;
+	struct nlattr *nest;
+
+	nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_OPTS);
+	if (!nest)
+		return -1;
+
+	if (opts->flags & TUNNEL_VXLAN_OPT) {
+		if (nla_put_be32(skb, NFTA_TUNNEL_KEY_VXLAN_GBP,
+				 htonl(opts->u.vxlan.gbp)))
+			return -1;
+	} else if (opts->flags & TUNNEL_ERSPAN_OPT) {
+		switch (opts->u.erspan.version) {
+		case ERSPAN_VERSION:
+			if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX,
+					 opts->u.erspan.u.index))
+				return -1;
+			break;
+		case ERSPAN_VERSION2:
+			if (nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_HWID,
+				       get_hwid(&opts->u.erspan.u.md2)) ||
+			    nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_DIR,
+				       opts->u.erspan.u.md2.dir))
+				return -1;
+			break;
+		}
+	}
+	nla_nest_end(skb, nest);
+
+	return 0;
+}
+
+static int nft_tunnel_ports_dump(struct sk_buff *skb,
+				 struct ip_tunnel_info *info)
+{
+	if (nla_put_be16(skb, NFTA_TUNNEL_KEY_SPORT, htons(info->key.tp_src)) < 0 ||
+	    nla_put_be16(skb, NFTA_TUNNEL_KEY_DPORT, htons(info->key.tp_dst)) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int nft_tunnel_flags_dump(struct sk_buff *skb,
+				 struct ip_tunnel_info *info)
+{
+	u32 flags = 0;
+
+	if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
+		flags |= NFT_TUNNEL_F_DONT_FRAGMENT;
+	if (!(info->key.tun_flags & TUNNEL_CSUM))
+		flags |= NFT_TUNNEL_F_ZERO_CSUM_TX;
+	if (info->key.tun_flags & TUNNEL_SEQ)
+		flags |= NFT_TUNNEL_F_SEQ_NUMBER;
+
+	if (nla_put_be32(skb, NFTA_TUNNEL_KEY_FLAGS, htonl(flags)) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int nft_tunnel_obj_dump(struct sk_buff *skb,
+			       struct nft_object *obj, bool reset)
+{
+	struct nft_tunnel_obj *priv = nft_obj_data(obj);
+	struct ip_tunnel_info *info = &priv->md->u.tun_info;
+
+	if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ID,
+			 tunnel_id_to_key32(info->key.tun_id)) ||
+	    nft_tunnel_ip_dump(skb, info) < 0 ||
+	    nft_tunnel_ports_dump(skb, info) < 0 ||
+	    nft_tunnel_flags_dump(skb, info) < 0 ||
+	    nla_put_u8(skb, NFTA_TUNNEL_KEY_TOS, info->key.tos) ||
+	    nla_put_u8(skb, NFTA_TUNNEL_KEY_TTL, info->key.ttl) ||
+	    nft_tunnel_opts_dump(skb, priv) < 0)
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static void nft_tunnel_obj_destroy(const struct nft_ctx *ctx,
+				   struct nft_object *obj)
+{
+	struct nft_tunnel_obj *priv = nft_obj_data(obj);
+
+	metadata_dst_free(priv->md);
+}
+
+static struct nft_object_type nft_tunnel_obj_type;
+static const struct nft_object_ops nft_tunnel_obj_ops = {
+	.type		= &nft_tunnel_obj_type,
+	.size		= sizeof(struct nft_tunnel_obj),
+	.eval		= nft_tunnel_obj_eval,
+	.init		= nft_tunnel_obj_init,
+	.destroy	= nft_tunnel_obj_destroy,
+	.dump		= nft_tunnel_obj_dump,
+};
+
+static struct nft_object_type nft_tunnel_obj_type __read_mostly = {
+	.type		= NFT_OBJECT_TUNNEL,
+	.ops		= &nft_tunnel_obj_ops,
+	.maxattr	= NFTA_TUNNEL_KEY_MAX,
+	.policy		= nft_tunnel_key_policy,
+	.owner		= THIS_MODULE,
+};
+
+static int __init nft_tunnel_module_init(void)
+{
+	int err;
+
+	err = nft_register_expr(&nft_tunnel_type);
+	if (err < 0)
+		return err;
+
+	err = nft_register_obj(&nft_tunnel_obj_type);
+	if (err < 0)
+		nft_unregister_expr(&nft_tunnel_type);
+
+	return err;
+}
+
+static void __exit nft_tunnel_module_exit(void)
+{
+	nft_unregister_obj(&nft_tunnel_obj_type);
+	nft_unregister_expr(&nft_tunnel_type);
+}
+
+module_init(nft_tunnel_module_init);
+module_exit(nft_tunnel_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Pablo Neira Ayuso <[e-mail]>");
+MODULE_ALIAS_NFT_EXPR("tunnel");
+MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_TUNNEL);

net/netfilter/xt_connlimit.c

···
 
 	/* init private data */
 	info->data = nf_conncount_init(par->net, par->family, keylen);
-	if (IS_ERR(info->data))
-		return PTR_ERR(info->data);
 
-	return 0;
+	return PTR_ERR_OR_ZERO(info->data);
 }
 
 static void connlimit_mt_destroy(const struct xt_mtdtor_param *par)

net/netfilter/xt_osf.c

···
 #include <net/netfilter/nf_log.h>
 #include <linux/netfilter/xt_osf.h>
 
-/*
- * Indexed by dont-fragment bit.
- * It is the only constant value in the fingerprint.
- */
-static struct list_head xt_osf_fingers[2];
-
-static const struct nla_policy xt_osf_policy[OSF_ATTR_MAX + 1] = {
-	[OSF_ATTR_FINGER]	= { .len = sizeof(struct xt_osf_user_finger) },
-};
-
-static int xt_osf_add_callback(struct net *net, struct sock *ctnl,
-			       struct sk_buff *skb, const struct nlmsghdr *nlh,
-			       const struct nlattr * const osf_attrs[],
-			       struct netlink_ext_ack *extack)
-{
-	struct xt_osf_user_finger *f;
-	struct xt_osf_finger *kf = NULL, *sf;
-	int err = 0;
-
-	if (!capable(CAP_NET_ADMIN))
-		return -EPERM;
-
-	if (!osf_attrs[OSF_ATTR_FINGER])
-		return -EINVAL;
-
-	if (!(nlh->nlmsg_flags & NLM_F_CREATE))
-		return -EINVAL;
-
-	f = nla_data(osf_attrs[OSF_ATTR_FINGER]);
-
-	kf = kmalloc(sizeof(struct xt_osf_finger), GFP_KERNEL);
-	if (!kf)
-		return -ENOMEM;
-
-	memcpy(&kf->finger, f, sizeof(struct xt_osf_user_finger));
-
-	list_for_each_entry(sf, &xt_osf_fingers[!!f->df], finger_entry) {
-		if (memcmp(&sf->finger, f, sizeof(struct xt_osf_user_finger)))
-			continue;
-
-		kfree(kf);
-		kf = NULL;
-
-		if (nlh->nlmsg_flags & NLM_F_EXCL)
-			err = -EEXIST;
-		break;
-	}
-
-	/*
-	 * We are protected by nfnl mutex.
-	 */
-	if (kf)
-		list_add_tail_rcu(&kf->finger_entry, &xt_osf_fingers[!!f->df]);
-
-	return err;
-}
-
-static int xt_osf_remove_callback(struct net *net, struct sock *ctnl,
-				  struct sk_buff *skb,
-				  const struct nlmsghdr *nlh,
-				  const struct nlattr * const osf_attrs[],
-				  struct netlink_ext_ack *extack)
-{
-	struct xt_osf_user_finger *f;
-	struct xt_osf_finger *sf;
-	int err = -ENOENT;
-
-	if (!capable(CAP_NET_ADMIN))
-		return -EPERM;
-
-	if (!osf_attrs[OSF_ATTR_FINGER])
-		return -EINVAL;
-
-	f = nla_data(osf_attrs[OSF_ATTR_FINGER]);
-
-	list_for_each_entry(sf, &xt_osf_fingers[!!f->df], finger_entry) {
-		if (memcmp(&sf->finger, f, sizeof(struct xt_osf_user_finger)))
-			continue;
-
-		/*
-		 * We are protected by nfnl mutex.
-		 */
-		list_del_rcu(&sf->finger_entry);
-		kfree_rcu(sf, rcu_head);
-
-		err = 0;
-		break;
-	}
-
-	return err;
-}
-
-static const struct nfnl_callback xt_osf_nfnetlink_callbacks[OSF_MSG_MAX] = {
-	[OSF_MSG_ADD]	= {
-		.call		= xt_osf_add_callback,
-		.attr_count	= OSF_ATTR_MAX,
-		.policy		= xt_osf_policy,
-	},
-	[OSF_MSG_REMOVE]	= {
-		.call		= xt_osf_remove_callback,
-		.attr_count	= OSF_ATTR_MAX,
-		.policy		= xt_osf_policy,
-	},
-};
-
-static const struct nfnetlink_subsystem xt_osf_nfnetlink = {
-	.name			= "osf",
-	.subsys_id		= NFNL_SUBSYS_OSF,
-	.cb_count		= OSF_MSG_MAX,
-	.cb			= xt_osf_nfnetlink_callbacks,
-};
-
 static bool
 xt_osf_match_packet(const struct sk_buff *skb, struct xt_action_param *p)
 {
···
 		return false;
 
 	return nf_osf_match(skb, xt_family(p), xt_hooknum(p), xt_in(p),
-			    xt_out(p), info, net, xt_osf_fingers);
+			    xt_out(p), info, net, nf_osf_fingers);
 }
 
 static struct xt_match xt_osf_match = {
···
 
 static int __init xt_osf_init(void)
 {
-	int err = -EINVAL;
-	int i;
-
-	for (i=0; i<ARRAY_SIZE(xt_osf_fingers); ++i)
-		INIT_LIST_HEAD(&xt_osf_fingers[i]);
-
-	err = nfnetlink_subsys_register(&xt_osf_nfnetlink);
-	if (err < 0) {
-		pr_err("Failed to register OSF nsfnetlink helper (%d)\n", err);
-		goto err_out_exit;
-	}
+	int err;
 
 	err = xt_register_match(&xt_osf_match);
 	if (err) {
 		pr_err("Failed to register OS fingerprint "
 		       "matching module (%d)\n", err);
-		goto err_out_remove;
+		return err;
 	}
 
 	return 0;
-
-err_out_remove:
-	nfnetlink_subsys_unregister(&xt_osf_nfnetlink);
-err_out_exit:
-	return err;
 }
 
 static void __exit xt_osf_fini(void)
 {
-	struct xt_osf_finger *f;
-	int i;
-
-	nfnetlink_subsys_unregister(&xt_osf_nfnetlink);
 	xt_unregister_match(&xt_osf_match);
-
-	rcu_read_lock();
-	for (i=0; i<ARRAY_SIZE(xt_osf_fingers); ++i) {
-
-		list_for_each_entry_rcu(f, &xt_osf_fingers[i], finger_entry) {
-			list_del_rcu(&f->finger_entry);
-			kfree_rcu(f, rcu_head);
-		}
-	}
-	rcu_read_unlock();
-
-	rcu_barrier();
 }
 
 module_init(xt_osf_init);