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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: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2018-08-02 20:51:39 +02:00
parent 033eab53ff
commit af308b94a2
5 changed files with 534 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
include/uapi/linux/netfilter/nf_tables.h
View File

@ -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 */

1
net/core/dst.c
View File

@ -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)

6
net/netfilter/Kconfig
View File

@ -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

1
net/netfilter/Makefile
View File

@ -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

458
net/netfilter/nft_tunnel.c Normal file
View File

@ -0,0 +1,458 @@
/* 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);