[linux.git] / net / ipv4 / ip_tunnel_core.c

/*
 * Copyright (c) 2013 Nicira, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/mroute.h>
#include <linux/init.h>
#include <linux/in6.h>
#include <linux/inetdevice.h>
#include <linux/netfilter_ipv4.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/static_key.h>

#include <net/ip.h>
#include <net/icmp.h>
#include <net/protocol.h>
#include <net/ip_tunnels.h>
#include <net/arp.h>
#include <net/checksum.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>

int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
		  __be32 src, __be32 dst, __u8 proto,
		  __u8 tos, __u8 ttl, __be16 df, bool xnet)
{
	int pkt_len = skb->len;
	struct iphdr *iph;
	int err;

	skb_scrub_packet(skb, xnet);

	skb_clear_hash(skb);
	skb_dst_set(skb, &rt->dst);
	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));

	/* Push down and install the IP header. */
	skb_push(skb, sizeof(struct iphdr));
	skb_reset_network_header(skb);

	iph = ip_hdr(skb);

	iph->version	=	4;
	iph->ihl	=	sizeof(struct iphdr) >> 2;
	iph->frag_off	=	df;
	iph->protocol	=	proto;
	iph->tos	=	tos;
	iph->daddr	=	dst;
	iph->saddr	=	src;
	iph->ttl	=	ttl;
	__ip_select_ident(dev_net(rt->dst.dev), iph,
			  skb_shinfo(skb)->gso_segs ?: 1);

	err = ip_local_out_sk(sk, skb);
	if (unlikely(net_xmit_eval(err)))
		pkt_len = 0;
	return pkt_len;
}
EXPORT_SYMBOL_GPL(iptunnel_xmit);

int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
{
	if (unlikely(!pskb_may_pull(skb, hdr_len)))
		return -ENOMEM;

	skb_pull_rcsum(skb, hdr_len);

	if (inner_proto == htons(ETH_P_TEB)) {
		struct ethhdr *eh;

		if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
			return -ENOMEM;

		eh = (struct ethhdr *)skb->data;
		if (likely(eth_proto_is_802_3(eh->h_proto)))
			skb->protocol = eh->h_proto;
		else
			skb->protocol = htons(ETH_P_802_2);

	} else {
		skb->protocol = inner_proto;
	}

	nf_reset(skb);
	secpath_reset(skb);
	skb_clear_hash_if_not_l4(skb);
	skb_dst_drop(skb);
	skb->vlan_tci = 0;
	skb_set_queue_mapping(skb, 0);
	skb->pkt_type = PACKET_HOST;
	return 0;
}
EXPORT_SYMBOL_GPL(iptunnel_pull_header);

struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb,
					 bool csum_help,
					 int gso_type_mask)
{
	int err;

	if (likely(!skb->encapsulation)) {
		skb_reset_inner_headers(skb);
		skb->encapsulation = 1;
	}

	if (skb_is_gso(skb)) {
		err = skb_unclone(skb, GFP_ATOMIC);
		if (unlikely(err))
			goto error;
		skb_shinfo(skb)->gso_type |= gso_type_mask;
		return skb;
	}

	/* If packet is not gso and we are resolving any partial checksum,
	 * clear encapsulation flag. This allows setting CHECKSUM_PARTIAL
	 * on the outer header without confusing devices that implement
	 * NETIF_F_IP_CSUM with encapsulation.
	 */
	if (csum_help)
		skb->encapsulation = 0;

	if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) {
		err = skb_checksum_help(skb);
		if (unlikely(err))
			goto error;
	} else if (skb->ip_summed != CHECKSUM_PARTIAL)
		skb->ip_summed = CHECKSUM_NONE;

	return skb;
error:
	kfree_skb(skb);
	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);

/* Often modified stats are per cpu, other are shared (netdev->stats) */
struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
						struct rtnl_link_stats64 *tot)
{
	int i;

	netdev_stats_to_stats64(tot, &dev->stats);

	for_each_possible_cpu(i) {
		const struct pcpu_sw_netstats *tstats =
						   per_cpu_ptr(dev->tstats, i);
		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
		unsigned int start;

		do {
			start = u64_stats_fetch_begin_irq(&tstats->syncp);
			rx_packets = tstats->rx_packets;
			tx_packets = tstats->tx_packets;
			rx_bytes = tstats->rx_bytes;
			tx_bytes = tstats->tx_bytes;
		} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));

		tot->rx_packets += rx_packets;
		tot->tx_packets += tx_packets;
		tot->rx_bytes   += rx_bytes;
		tot->tx_bytes   += tx_bytes;
	}

	return tot;
}
EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);

static const struct nla_policy ip_tun_policy[IP_TUN_MAX + 1] = {
	[IP_TUN_ID]		= { .type = NLA_U64 },
	[IP_TUN_DST]		= { .type = NLA_U32 },
	[IP_TUN_SRC]		= { .type = NLA_U32 },
	[IP_TUN_TTL]		= { .type = NLA_U8 },
	[IP_TUN_TOS]		= { .type = NLA_U8 },
	[IP_TUN_SPORT]		= { .type = NLA_U16 },
	[IP_TUN_DPORT]		= { .type = NLA_U16 },
	[IP_TUN_FLAGS]		= { .type = NLA_U16 },
};

static int ip_tun_build_state(struct net_device *dev, struct nlattr *attr,
			      struct lwtunnel_state **ts)
{
	struct ip_tunnel_info *tun_info;
	struct lwtunnel_state *new_state;
	struct nlattr *tb[IP_TUN_MAX + 1];
	int err;

	err = nla_parse_nested(tb, IP_TUN_MAX, attr, ip_tun_policy);
	if (err < 0)
		return err;

	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
	if (!new_state)
		return -ENOMEM;

	new_state->type = LWTUNNEL_ENCAP_IP;

	tun_info = lwt_tun_info(new_state);

	if (tb[IP_TUN_ID])
		tun_info->key.tun_id = nla_get_u64(tb[IP_TUN_ID]);

	if (tb[IP_TUN_DST])
		tun_info->key.ipv4_dst = nla_get_be32(tb[IP_TUN_DST]);

	if (tb[IP_TUN_SRC])
		tun_info->key.ipv4_src = nla_get_be32(tb[IP_TUN_SRC]);

	if (tb[IP_TUN_TTL])
		tun_info->key.ipv4_ttl = nla_get_u8(tb[IP_TUN_TTL]);

	if (tb[IP_TUN_TOS])
		tun_info->key.ipv4_tos = nla_get_u8(tb[IP_TUN_TOS]);

	if (tb[IP_TUN_SPORT])
		tun_info->key.tp_src = nla_get_be16(tb[IP_TUN_SPORT]);

	if (tb[IP_TUN_DPORT])
		tun_info->key.tp_dst = nla_get_be16(tb[IP_TUN_DPORT]);

	if (tb[IP_TUN_FLAGS])
		tun_info->key.tun_flags = nla_get_u16(tb[IP_TUN_FLAGS]);

	tun_info->mode = IP_TUNNEL_INFO_TX;
	tun_info->options = NULL;
	tun_info->options_len = 0;

	*ts = new_state;

	return 0;
}

static int ip_tun_fill_encap_info(struct sk_buff *skb,
				  struct lwtunnel_state *lwtstate)
{
	struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);

	if (nla_put_u64(skb, IP_TUN_ID, tun_info->key.tun_id) ||
	    nla_put_be32(skb, IP_TUN_DST, tun_info->key.ipv4_dst) ||
	    nla_put_be32(skb, IP_TUN_SRC, tun_info->key.ipv4_src) ||
	    nla_put_u8(skb, IP_TUN_TOS, tun_info->key.ipv4_tos) ||
	    nla_put_u8(skb, IP_TUN_TTL, tun_info->key.ipv4_ttl) ||
	    nla_put_u16(skb, IP_TUN_SPORT, tun_info->key.tp_src) ||
	    nla_put_u16(skb, IP_TUN_DPORT, tun_info->key.tp_dst) ||
	    nla_put_u16(skb, IP_TUN_FLAGS, tun_info->key.tun_flags))
		return -ENOMEM;

	return 0;
}

static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
{
	return nla_total_size(8)	/* IP_TUN_ID */
		+ nla_total_size(4)	/* IP_TUN_DST */
		+ nla_total_size(4)	/* IP_TUN_SRC */
		+ nla_total_size(1)	/* IP_TUN_TOS */
		+ nla_total_size(1)	/* IP_TUN_TTL */
		+ nla_total_size(2)	/* IP_TUN_SPORT */
		+ nla_total_size(2)	/* IP_TUN_DPORT */
		+ nla_total_size(2);	/* IP_TUN_FLAGS */
}

static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
	.build_state = ip_tun_build_state,
	.fill_encap = ip_tun_fill_encap_info,
	.get_encap_size = ip_tun_encap_nlsize,
};

void __init ip_tunnel_core_init(void)
{
	lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
}

struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
EXPORT_SYMBOL(ip_tunnel_metadata_cnt);

void ip_tunnel_need_metadata(void)
{
	static_key_slow_inc(&ip_tunnel_metadata_cnt);
}
EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);

void ip_tunnel_unneed_metadata(void)
{
	static_key_slow_dec(&ip_tunnel_metadata_cnt);
}
EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
Commit	Line	Data
0e6fbc5b PS	1	/*
	2	* Copyright (c) 2013 Nicira, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of version 2 of the GNU General Public
	6	* License as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software
	15	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	16	* 02110-1301, USA
	17	*/
	18
	19	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	20
	21	#include <linux/types.h>
	22	#include <linux/kernel.h>
	23	#include <linux/skbuff.h>
	24	#include <linux/netdevice.h>
	25	#include <linux/in.h>
	26	#include <linux/if_arp.h>
	27	#include <linux/mroute.h>
	28	#include <linux/init.h>
	29	#include <linux/in6.h>
	30	#include <linux/inetdevice.h>
	31	#include <linux/netfilter_ipv4.h>
	32	#include <linux/etherdevice.h>
	33	#include <linux/if_ether.h>
	34	#include <linux/if_vlan.h>
e7030878	35	#include <linux/static_key.h>
0e6fbc5b PS	36
	37	#include <net/ip.h>
	38	#include <net/icmp.h>
	39	#include <net/protocol.h>
	40	#include <net/ip_tunnels.h>
	41	#include <net/arp.h>
	42	#include <net/checksum.h>
	43	#include <net/dsfield.h>
	44	#include <net/inet_ecn.h>
	45	#include <net/xfrm.h>
	46	#include <net/net_namespace.h>
	47	#include <net/netns/generic.h>
	48	#include <net/rtnetlink.h>
	49
aad88724	50	int iptunnel_xmit(struct sock sk, struct rtable rt, struct sk_buff *skb,
0e6fbc5b	51	__be32 src, __be32 dst, __u8 proto,
963a88b3	52	__u8 tos, __u8 ttl, __be16 df, bool xnet)
0e6fbc5b PS	53	{
	54	int pkt_len = skb->len;
	55	struct iphdr *iph;
	56	int err;
	57
963a88b3 ND	58	skb_scrub_packet(skb, xnet);
963a88b3 ND	59
7539fadc	60	skb_clear_hash(skb);
0e6fbc5b PS	61	skb_dst_set(skb, &rt->dst);
	62	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
	63
	64	/* Push down and install the IP header. */
78a3694d	65	skb_push(skb, sizeof(struct iphdr));
0e6fbc5b PS	66	skb_reset_network_header(skb);
	67
	68	iph = ip_hdr(skb);
	69
	70	iph->version = 4;
	71	iph->ihl = sizeof(struct iphdr) >> 2;
	72	iph->frag_off = df;
	73	iph->protocol = proto;
	74	iph->tos = tos;
	75	iph->daddr = dst;
	76	iph->saddr = src;
	77	iph->ttl = ttl;
926a882f HFS	78	__ip_select_ident(dev_net(rt->dst.dev), iph,
926a882f HFS	79	skb_shinfo(skb)->gso_segs ?: 1);
0e6fbc5b	80
aad88724	81	err = ip_local_out_sk(sk, skb);
0e6fbc5b PS	82	if (unlikely(net_xmit_eval(err)))
	83	pkt_len = 0;
	84	return pkt_len;
	85	}
	86	EXPORT_SYMBOL_GPL(iptunnel_xmit);
3d7b46cd PS	87
	88	int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
	89	{
	90	if (unlikely(!pskb_may_pull(skb, hdr_len)))
	91	return -ENOMEM;
	92
	93	skb_pull_rcsum(skb, hdr_len);
	94
	95	if (inner_proto == htons(ETH_P_TEB)) {
1245dfc8	96	struct ethhdr *eh;
3d7b46cd PS	97
	98	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
	99	return -ENOMEM;
	100
1245dfc8	101	eh = (struct ethhdr *)skb->data;
d181ddca	102	if (likely(eth_proto_is_802_3(eh->h_proto)))
3d7b46cd PS	103	skb->protocol = eh->h_proto;
	104	else
	105	skb->protocol = htons(ETH_P_802_2);
	106
	107	} else {
	108	skb->protocol = inner_proto;
	109	}
	110
	111	nf_reset(skb);
	112	secpath_reset(skb);
7539fadc	113	skb_clear_hash_if_not_l4(skb);
fbd02dd4	114	skb_dst_drop(skb);
3d7b46cd PS	115	skb->vlan_tci = 0;
	116	skb_set_queue_mapping(skb, 0);
	117	skb->pkt_type = PACKET_HOST;
	118	return 0;
	119	}
	120	EXPORT_SYMBOL_GPL(iptunnel_pull_header);
2d26f0a3 ED	121
	122	struct sk_buff iptunnel_handle_offloads(struct sk_buff skb,
	123	bool csum_help,
	124	int gso_type_mask)
	125	{
	126	int err;
	127
	128	if (likely(!skb->encapsulation)) {
	129	skb_reset_inner_headers(skb);
	130	skb->encapsulation = 1;
	131	}
	132
	133	if (skb_is_gso(skb)) {
	134	err = skb_unclone(skb, GFP_ATOMIC);
	135	if (unlikely(err))
	136	goto error;
	137	skb_shinfo(skb)->gso_type \|= gso_type_mask;
	138	return skb;
	139	}
	140
7e2b10c1 TH	141	/* If packet is not gso and we are resolving any partial checksum,
	142	* clear encapsulation flag. This allows setting CHECKSUM_PARTIAL
	143	* on the outer header without confusing devices that implement
	144	* NETIF_F_IP_CSUM with encapsulation.
	145	*/
	146	if (csum_help)
	147	skb->encapsulation = 0;
	148
2d26f0a3 ED	149	if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) {
	150	err = skb_checksum_help(skb);
	151	if (unlikely(err))
	152	goto error;
	153	} else if (skb->ip_summed != CHECKSUM_PARTIAL)
	154	skb->ip_summed = CHECKSUM_NONE;
	155
	156	return skb;
	157	error:
	158	kfree_skb(skb);
	159	return ERR_PTR(err);
	160	}
	161	EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
ebe44f35 DM	162
	163	/* Often modified stats are per cpu, other are shared (netdev->stats) */
	164	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	165	struct rtnl_link_stats64 *tot)
	166	{
	167	int i;
	168
c24a5964 AD	169	netdev_stats_to_stats64(tot, &dev->stats);
c24a5964 AD	170
ebe44f35 DM	171	for_each_possible_cpu(i) {
	172	const struct pcpu_sw_netstats *tstats =
	173	per_cpu_ptr(dev->tstats, i);
	174	u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
	175	unsigned int start;
	176
	177	do {
57a7744e	178	start = u64_stats_fetch_begin_irq(&tstats->syncp);
ebe44f35 DM	179	rx_packets = tstats->rx_packets;
	180	tx_packets = tstats->tx_packets;
	181	rx_bytes = tstats->rx_bytes;
	182	tx_bytes = tstats->tx_bytes;
57a7744e	183	} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
ebe44f35 DM	184
	185	tot->rx_packets += rx_packets;
	186	tot->tx_packets += tx_packets;
	187	tot->rx_bytes += rx_bytes;
	188	tot->tx_bytes += tx_bytes;
	189	}
	190
ebe44f35 DM	191	return tot;
	192	}
	193	EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
3093fbe7 TG	194
	195	static const struct nla_policy ip_tun_policy[IP_TUN_MAX + 1] = {
	196	[IP_TUN_ID] = { .type = NLA_U64 },
	197	[IP_TUN_DST] = { .type = NLA_U32 },
	198	[IP_TUN_SRC] = { .type = NLA_U32 },
	199	[IP_TUN_TTL] = { .type = NLA_U8 },
	200	[IP_TUN_TOS] = { .type = NLA_U8 },
	201	[IP_TUN_SPORT] = { .type = NLA_U16 },
	202	[IP_TUN_DPORT] = { .type = NLA_U16 },
	203	[IP_TUN_FLAGS] = { .type = NLA_U16 },
	204	};
	205
	206	static int ip_tun_build_state(struct net_device dev, struct nlattr attr,
	207	struct lwtunnel_state **ts)
	208	{
	209	struct ip_tunnel_info *tun_info;
	210	struct lwtunnel_state *new_state;
	211	struct nlattr *tb[IP_TUN_MAX + 1];
	212	int err;
	213
	214	err = nla_parse_nested(tb, IP_TUN_MAX, attr, ip_tun_policy);
	215	if (err < 0)
	216	return err;
	217
	218	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
	219	if (!new_state)
	220	return -ENOMEM;
	221
	222	new_state->type = LWTUNNEL_ENCAP_IP;
	223
	224	tun_info = lwt_tun_info(new_state);
	225
	226	if (tb[IP_TUN_ID])
	227	tun_info->key.tun_id = nla_get_u64(tb[IP_TUN_ID]);
	228
	229	if (tb[IP_TUN_DST])
	230	tun_info->key.ipv4_dst = nla_get_be32(tb[IP_TUN_DST]);
	231
	232	if (tb[IP_TUN_SRC])
	233	tun_info->key.ipv4_src = nla_get_be32(tb[IP_TUN_SRC]);
	234
	235	if (tb[IP_TUN_TTL])
	236	tun_info->key.ipv4_ttl = nla_get_u8(tb[IP_TUN_TTL]);
	237
	238	if (tb[IP_TUN_TOS])
	239	tun_info->key.ipv4_tos = nla_get_u8(tb[IP_TUN_TOS]);
	240
	241	if (tb[IP_TUN_SPORT])
	242	tun_info->key.tp_src = nla_get_be16(tb[IP_TUN_SPORT]);
	243
	244	if (tb[IP_TUN_DPORT])
	245	tun_info->key.tp_dst = nla_get_be16(tb[IP_TUN_DPORT]);
	246
	247	if (tb[IP_TUN_FLAGS])
	248	tun_info->key.tun_flags = nla_get_u16(tb[IP_TUN_FLAGS]);
	249
	250	tun_info->mode = IP_TUNNEL_INFO_TX;
	251	tun_info->options = NULL;
	252	tun_info->options_len = 0;
	253
	254	*ts = new_state;
	255
	256	return 0;
	257	}
258
259	static int ip_tun_fill_encap_info(struct sk_buff *skb,
260	struct lwtunnel_state *lwtstate)
261	{
262	struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
263
264	if (nla_put_u64(skb, IP_TUN_ID, tun_info->key.tun_id) \|\|
265	nla_put_be32(skb, IP_TUN_DST, tun_info->key.ipv4_dst) \|\|
266	nla_put_be32(skb, IP_TUN_SRC, tun_info->key.ipv4_src) \|\|
267	nla_put_u8(skb, IP_TUN_TOS, tun_info->key.ipv4_tos) \|\|
268	nla_put_u8(skb, IP_TUN_TTL, tun_info->key.ipv4_ttl) \|\|
269	nla_put_u16(skb, IP_TUN_SPORT, tun_info->key.tp_src) \|\|
270	nla_put_u16(skb, IP_TUN_DPORT, tun_info->key.tp_dst) \|\|
271	nla_put_u16(skb, IP_TUN_FLAGS, tun_info->key.tun_flags))
272	return -ENOMEM;
273
274	return 0;
275	}
276
277	static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
278	{
279	return nla_total_size(8) /* IP_TUN_ID */
280	+ nla_total_size(4) /* IP_TUN_DST */
281	+ nla_total_size(4) /* IP_TUN_SRC */
282	+ nla_total_size(1) /* IP_TUN_TOS */
283	+ nla_total_size(1) /* IP_TUN_TTL */
284	+ nla_total_size(2) /* IP_TUN_SPORT */
285	+ nla_total_size(2) /* IP_TUN_DPORT */
286	+ nla_total_size(2); /* IP_TUN_FLAGS */
287	}
288
289	static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
290	.build_state = ip_tun_build_state,
291	.fill_encap = ip_tun_fill_encap_info,
292	.get_encap_size = ip_tun_encap_nlsize,
293	};
294
045a0fa0	295	void __init ip_tunnel_core_init(void)
3093fbe7 TG	296	{
3093fbe7 TG	297	lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
3093fbe7	298	}
e7030878 TG	299
	300	struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
	301	EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
	302
	303	void ip_tunnel_need_metadata(void)
	304	{
	305	static_key_slow_inc(&ip_tunnel_metadata_cnt);
	306	}
	307	EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
	308
	309	void ip_tunnel_unneed_metadata(void)
	310	{
	311	static_key_slow_dec(&ip_tunnel_metadata_cnt);
	312	}
	313	EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);