net/ipv4/ip_tunnel_core.c - third_party/linux - Git at Google

 /*
  * 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>
 #include <net/dst_metadata.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 - skb_inner_network_offset(skb);
 	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 metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
 					     gfp_t flags)
 {
 	struct metadata_dst *res;
 	struct ip_tunnel_info *dst, *src;

 	if (!md || md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
 		return NULL;

 	res = metadata_dst_alloc(0, flags);
 	if (!res)
 		return NULL;

 	dst = &res->u.tun_info;
 	src = &md->u.tun_info;
 	dst->key.tun_id = src->key.tun_id;
 	if (src->mode & IP_TUNNEL_INFO_IPV6)
 		memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
 		       sizeof(struct in6_addr));
 	else
 		dst->key.u.ipv4.dst = src->key.u.ipv4.src;
 	dst->mode = src->mode | IP_TUNNEL_INFO_TX;

 	return res;
 }
 EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);

 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[LWTUNNEL_IP_MAX + 1] = {
 	[LWTUNNEL_IP_ID]	= { .type = NLA_U64 },
 	[LWTUNNEL_IP_DST]	= { .type = NLA_U32 },
 	[LWTUNNEL_IP_SRC]	= { .type = NLA_U32 },
 	[LWTUNNEL_IP_TTL]	= { .type = NLA_U8 },
 	[LWTUNNEL_IP_TOS]	= { .type = NLA_U8 },
 	[LWTUNNEL_IP_FLAGS]	= { .type = NLA_U16 },
 };

 static int ip_tun_build_state(struct net_device *dev, struct nlattr *attr,
 			      unsigned int family, const void *cfg,
 			      struct lwtunnel_state **ts)
 {
 	struct ip_tunnel_info *tun_info;
 	struct lwtunnel_state *new_state;
 	struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
 	int err;

 	err = nla_parse_nested(tb, LWTUNNEL_IP_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[LWTUNNEL_IP_ID])
 		tun_info->key.tun_id = nla_get_u64(tb[LWTUNNEL_IP_ID]);

 	if (tb[LWTUNNEL_IP_DST])
 		tun_info->key.u.ipv4.dst = nla_get_be32(tb[LWTUNNEL_IP_DST]);

 	if (tb[LWTUNNEL_IP_SRC])
 		tun_info->key.u.ipv4.src = nla_get_be32(tb[LWTUNNEL_IP_SRC]);

 	if (tb[LWTUNNEL_IP_TTL])
 		tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);

 	if (tb[LWTUNNEL_IP_TOS])
 		tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);

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

 	tun_info->mode = IP_TUNNEL_INFO_TX;
 	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, LWTUNNEL_IP_ID, tun_info->key.tun_id) ||
 	    nla_put_be32(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
 	    nla_put_be32(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
 	    nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
 	    nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
 	    nla_put_u16(skb, LWTUNNEL_IP_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)	/* LWTUNNEL_IP_ID */
 		+ nla_total_size(4)	/* LWTUNNEL_IP_DST */
 		+ nla_total_size(4)	/* LWTUNNEL_IP_SRC */
 		+ nla_total_size(1)	/* LWTUNNEL_IP_TOS */
 		+ nla_total_size(1)	/* LWTUNNEL_IP_TTL */
 		+ nla_total_size(2);	/* LWTUNNEL_IP_FLAGS */
 }

 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
 {
 	return memcmp(lwt_tun_info(a), lwt_tun_info(b),
 		      sizeof(struct ip_tunnel_info));
 }

 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,
 	.cmp_encap = ip_tun_cmp_encap,
 };

 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
 	[LWTUNNEL_IP6_ID]		= { .type = NLA_U64 },
 	[LWTUNNEL_IP6_DST]		= { .len = sizeof(struct in6_addr) },
 	[LWTUNNEL_IP6_SRC]		= { .len = sizeof(struct in6_addr) },
 	[LWTUNNEL_IP6_HOPLIMIT]		= { .type = NLA_U8 },
 	[LWTUNNEL_IP6_TC]		= { .type = NLA_U8 },
 	[LWTUNNEL_IP6_FLAGS]		= { .type = NLA_U16 },
 };

 static int ip6_tun_build_state(struct net_device *dev, struct nlattr *attr,
 			       unsigned int family, const void *cfg,
 			       struct lwtunnel_state **ts)
 {
 	struct ip_tunnel_info *tun_info;
 	struct lwtunnel_state *new_state;
 	struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
 	int err;

 	err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_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_IP6;

 	tun_info = lwt_tun_info(new_state);

 	if (tb[LWTUNNEL_IP6_ID])
 		tun_info->key.tun_id = nla_get_u64(tb[LWTUNNEL_IP6_ID]);

 	if (tb[LWTUNNEL_IP6_DST])
 		tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);

 	if (tb[LWTUNNEL_IP6_SRC])
 		tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);

 	if (tb[LWTUNNEL_IP6_HOPLIMIT])
 		tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);

 	if (tb[LWTUNNEL_IP6_TC])
 		tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);

 	if (tb[LWTUNNEL_IP6_FLAGS])
 		tun_info->key.tun_flags = nla_get_u16(tb[LWTUNNEL_IP6_FLAGS]);

 	tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
 	tun_info->options_len = 0;

 	*ts = new_state;

 	return 0;
 }

 static int ip6_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, LWTUNNEL_IP6_ID, tun_info->key.tun_id) ||
 	    nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
 	    nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
 	    nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.tos) ||
 	    nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.ttl) ||
 	    nla_put_u16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
 		return -ENOMEM;

 	return 0;
 }

 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
 {
 	return nla_total_size(8)	/* LWTUNNEL_IP6_ID */
 		+ nla_total_size(16)	/* LWTUNNEL_IP6_DST */
 		+ nla_total_size(16)	/* LWTUNNEL_IP6_SRC */
 		+ nla_total_size(1)	/* LWTUNNEL_IP6_HOPLIMIT */
 		+ nla_total_size(1)	/* LWTUNNEL_IP6_TC */
 		+ nla_total_size(2);	/* LWTUNNEL_IP6_FLAGS */
 }

 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
 	.build_state = ip6_tun_build_state,
 	.fill_encap = ip6_tun_fill_encap_info,
 	.get_encap_size = ip6_tun_encap_nlsize,
 	.cmp_encap = ip_tun_cmp_encap,
 };

 void __init ip_tunnel_core_init(void)
 {
 	lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
 	lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
 }

 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);
	/*
	* 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>
	#include <net/dst_metadata.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 - skb_inner_network_offset(skb);
	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 metadata_dst iptunnel_metadata_reply(struct metadata_dst md,
	gfp_t flags)
	{
	struct metadata_dst *res;
	struct ip_tunnel_info dst, src;

	if (!md \|\| md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
	return NULL;

	res = metadata_dst_alloc(0, flags);
	if (!res)
	return NULL;

	dst = &res->u.tun_info;
	src = &md->u.tun_info;
	dst->key.tun_id = src->key.tun_id;
	if (src->mode & IP_TUNNEL_INFO_IPV6)
	memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
	sizeof(struct in6_addr));
	else
	dst->key.u.ipv4.dst = src->key.u.ipv4.src;
	dst->mode = src->mode \| IP_TUNNEL_INFO_TX;

	return res;
	}
	EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);

	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[LWTUNNEL_IP_MAX + 1] = {
	[LWTUNNEL_IP_ID] = { .type = NLA_U64 },
	[LWTUNNEL_IP_DST] = { .type = NLA_U32 },
	[LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
	[LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
	[LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
	[LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
	};

	static int ip_tun_build_state(struct net_device dev, struct nlattr attr,
	unsigned int family, const void *cfg,
	struct lwtunnel_state **ts)
	{
	struct ip_tunnel_info *tun_info;
	struct lwtunnel_state *new_state;
	struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
	int err;

	err = nla_parse_nested(tb, LWTUNNEL_IP_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[LWTUNNEL_IP_ID])
	tun_info->key.tun_id = nla_get_u64(tb[LWTUNNEL_IP_ID]);

	if (tb[LWTUNNEL_IP_DST])
	tun_info->key.u.ipv4.dst = nla_get_be32(tb[LWTUNNEL_IP_DST]);

	if (tb[LWTUNNEL_IP_SRC])
	tun_info->key.u.ipv4.src = nla_get_be32(tb[LWTUNNEL_IP_SRC]);

	if (tb[LWTUNNEL_IP_TTL])
	tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);

	if (tb[LWTUNNEL_IP_TOS])
	tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);

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

	tun_info->mode = IP_TUNNEL_INFO_TX;
	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, LWTUNNEL_IP_ID, tun_info->key.tun_id) \|\|
	nla_put_be32(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) \|\|
	nla_put_be32(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) \|\|
	nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) \|\|
	nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) \|\|
	nla_put_u16(skb, LWTUNNEL_IP_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) /* LWTUNNEL_IP_ID */
	+ nla_total_size(4) /* LWTUNNEL_IP_DST */
	+ nla_total_size(4) /* LWTUNNEL_IP_SRC */
	+ nla_total_size(1) /* LWTUNNEL_IP_TOS */
	+ nla_total_size(1) /* LWTUNNEL_IP_TTL */
	+ nla_total_size(2); /* LWTUNNEL_IP_FLAGS */
	}

	static int ip_tun_cmp_encap(struct lwtunnel_state a, struct lwtunnel_state b)
	{
	return memcmp(lwt_tun_info(a), lwt_tun_info(b),
	sizeof(struct ip_tunnel_info));
	}

	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,
	.cmp_encap = ip_tun_cmp_encap,
	};

	static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
	[LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
	[LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
	[LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
	[LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
	[LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
	[LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
	};

	static int ip6_tun_build_state(struct net_device dev, struct nlattr attr,
	unsigned int family, const void *cfg,
	struct lwtunnel_state **ts)
	{
	struct ip_tunnel_info *tun_info;
	struct lwtunnel_state *new_state;
	struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
	int err;

	err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_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_IP6;

	tun_info = lwt_tun_info(new_state);

	if (tb[LWTUNNEL_IP6_ID])
	tun_info->key.tun_id = nla_get_u64(tb[LWTUNNEL_IP6_ID]);

	if (tb[LWTUNNEL_IP6_DST])
	tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);

	if (tb[LWTUNNEL_IP6_SRC])
	tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);

	if (tb[LWTUNNEL_IP6_HOPLIMIT])
	tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);

	if (tb[LWTUNNEL_IP6_TC])
	tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);

	if (tb[LWTUNNEL_IP6_FLAGS])
	tun_info->key.tun_flags = nla_get_u16(tb[LWTUNNEL_IP6_FLAGS]);

	tun_info->mode = IP_TUNNEL_INFO_TX \| IP_TUNNEL_INFO_IPV6;
	tun_info->options_len = 0;

	*ts = new_state;

	return 0;
	}

	static int ip6_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, LWTUNNEL_IP6_ID, tun_info->key.tun_id) \|\|
	nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) \|\|
	nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) \|\|
	nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.tos) \|\|
	nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.ttl) \|\|
	nla_put_u16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
	return -ENOMEM;

	return 0;
	}

	static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
	{
	return nla_total_size(8) /* LWTUNNEL_IP6_ID */
	+ nla_total_size(16) /* LWTUNNEL_IP6_DST */
	+ nla_total_size(16) /* LWTUNNEL_IP6_SRC */
	+ nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
	+ nla_total_size(1) /* LWTUNNEL_IP6_TC */
	+ nla_total_size(2); /* LWTUNNEL_IP6_FLAGS */
	}

	static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
	.build_state = ip6_tun_build_state,
	.fill_encap = ip6_tun_fill_encap_info,
	.get_encap_size = ip6_tun_encap_nlsize,
	.cmp_encap = ip_tun_cmp_encap,
	};

	void __init ip_tunnel_core_init(void)
	{
	lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
	lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
	}

	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);