Commit af308b94 authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
Browse files

netfilter: nf_tables: add tunnel support 



This patch implements the tunnel object type that can be used to
configure tunnels via metadata template through the existing lightweight
API from the ingress path.

Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 033eab53

include/uapi/linux/netfilter/nf_tables.h

+68 −1
Original line number Diff line number Diff line
@@ -1416,7 +1416,8 @@ enum nft_ct_helper_attributes { 
#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)



/**
@@ -1580,4 +1581,70 @@ enum nft_ng_types { 
};

#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)



#endif /* _LINUX_NF_TABLES_H */

net/core/dst.c

+1 −0
Original line number Diff line number Diff line
@@ -307,6 +307,7 @@ void metadata_dst_free(struct metadata_dst *md_dst) 
#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

+6 −0
Original line number Diff line number Diff line
@@ -559,6 +559,12 @@ config NFT_NAT 
	  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

net/netfilter/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -101,6 +101,7 @@ obj-$(CONFIG_NFT_QUEUE) += nft_queue.o 
obj-$(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

net/netfilter/nft_tunnel.c

0 → 100644
+458 −0
Original line number Diff line number Diff line 
/* 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_opts {

	union {

		struct vxlan_metadata	vxlan;

		struct erspan_metadata	erspan;

	} u;

	u32	len;

	u32	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 =

			ntohs(nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]));

	}

	if (tb[NFTA_TUNNEL_KEY_DPORT]) {

		info.key.tp_dst =

			ntohs(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)

{

	return nft_register_obj(&nft_tunnel_obj_type);

}



static void __exit nft_tunnel_module_exit(void)

{

	nft_unregister_obj(&nft_tunnel_obj_type);

}



module_init(nft_tunnel_module_init);

module_exit(nft_tunnel_module_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");

MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_TUNNEL);