[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/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>

void 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 net *net = dev_net(rt->dst.dev);
	struct net_device *dev = skb->dev;
	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(net, iph, skb_shinfo(skb)->gso_segs ?: 1);

	err = ip_local_out(net, sk, skb);
	if (unlikely(net_xmit_eval(err)))
		pkt_len = 0;
	iptunnel_xmit_stats(dev, 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_be64(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_be16(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_be64(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_be16(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_be64(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_be16(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_be64(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_be16(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);
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>
0e6fbc5b PS	27	#include <linux/init.h>
	28	#include <linux/in6.h>
	29	#include <linux/inetdevice.h>
	30	#include <linux/netfilter_ipv4.h>
	31	#include <linux/etherdevice.h>
	32	#include <linux/if_ether.h>
	33	#include <linux/if_vlan.h>
e7030878	34	#include <linux/static_key.h>
0e6fbc5b PS	35
	36	#include <net/ip.h>
	37	#include <net/icmp.h>
	38	#include <net/protocol.h>
	39	#include <net/ip_tunnels.h>
	40	#include <net/arp.h>
	41	#include <net/checksum.h>
	42	#include <net/dsfield.h>
	43	#include <net/inet_ecn.h>
	44	#include <net/xfrm.h>
	45	#include <net/net_namespace.h>
	46	#include <net/netns/generic.h>
	47	#include <net/rtnetlink.h>
63d008a4	48	#include <net/dst_metadata.h>
0e6fbc5b	49
039f5062 PS	50	void iptunnel_xmit(struct sock sk, struct rtable rt, struct sk_buff *skb,
	51	__be32 src, __be32 dst, __u8 proto,
	52	__u8 tos, __u8 ttl, __be16 df, bool xnet)
0e6fbc5b	53	{
bc22a0e2	54	int pkt_len = skb->len - skb_inner_network_offset(skb);
f859b0f6	55	struct net *net = dev_net(rt->dst.dev);
039f5062	56	struct net_device *dev = skb->dev;
0e6fbc5b PS	57	struct iphdr *iph;
	58	int err;
	59
963a88b3 ND	60	skb_scrub_packet(skb, xnet);
963a88b3 ND	61
7539fadc	62	skb_clear_hash(skb);
0e6fbc5b PS	63	skb_dst_set(skb, &rt->dst);
	64	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
	65
	66	/* Push down and install the IP header. */
78a3694d	67	skb_push(skb, sizeof(struct iphdr));
0e6fbc5b PS	68	skb_reset_network_header(skb);
	69
	70	iph = ip_hdr(skb);
	71
	72	iph->version = 4;
	73	iph->ihl = sizeof(struct iphdr) >> 2;
	74	iph->frag_off = df;
	75	iph->protocol = proto;
	76	iph->tos = tos;
	77	iph->daddr = dst;
	78	iph->saddr = src;
	79	iph->ttl = ttl;
f859b0f6	80	__ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
0e6fbc5b	81
33224b16	82	err = ip_local_out(net, sk, skb);
0e6fbc5b PS	83	if (unlikely(net_xmit_eval(err)))
0e6fbc5b PS	84	pkt_len = 0;
039f5062	85	iptunnel_xmit_stats(dev, pkt_len);
0e6fbc5b PS	86	}
0e6fbc5b PS	87	EXPORT_SYMBOL_GPL(iptunnel_xmit);
3d7b46cd PS	88
	89	int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
	90	{
	91	if (unlikely(!pskb_may_pull(skb, hdr_len)))
	92	return -ENOMEM;
	93
	94	skb_pull_rcsum(skb, hdr_len);
	95
	96	if (inner_proto == htons(ETH_P_TEB)) {
1245dfc8	97	struct ethhdr *eh;
3d7b46cd PS	98
	99	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
	100	return -ENOMEM;
	101
1245dfc8	102	eh = (struct ethhdr *)skb->data;
d181ddca	103	if (likely(eth_proto_is_802_3(eh->h_proto)))
3d7b46cd PS	104	skb->protocol = eh->h_proto;
	105	else
	106	skb->protocol = htons(ETH_P_802_2);
	107
	108	} else {
	109	skb->protocol = inner_proto;
	110	}
	111
	112	nf_reset(skb);
	113	secpath_reset(skb);
7539fadc	114	skb_clear_hash_if_not_l4(skb);
fbd02dd4	115	skb_dst_drop(skb);
3d7b46cd PS	116	skb->vlan_tci = 0;
	117	skb_set_queue_mapping(skb, 0);
	118	skb->pkt_type = PACKET_HOST;
	119	return 0;
	120	}
	121	EXPORT_SYMBOL_GPL(iptunnel_pull_header);
2d26f0a3	122
63d008a4 JB	123	struct metadata_dst iptunnel_metadata_reply(struct metadata_dst md,
	124	gfp_t flags)
	125	{
	126	struct metadata_dst *res;
	127	struct ip_tunnel_info dst, src;
	128
	129	if (!md \|\| md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
	130	return NULL;
	131
	132	res = metadata_dst_alloc(0, flags);
	133	if (!res)
	134	return NULL;
	135
	136	dst = &res->u.tun_info;
	137	src = &md->u.tun_info;
	138	dst->key.tun_id = src->key.tun_id;
	139	if (src->mode & IP_TUNNEL_INFO_IPV6)
	140	memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
	141	sizeof(struct in6_addr));
	142	else
	143	dst->key.u.ipv4.dst = src->key.u.ipv4.src;
	144	dst->mode = src->mode \| IP_TUNNEL_INFO_TX;
	145
	146	return res;
	147	}
	148	EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
	149
2d26f0a3 ED	150	struct sk_buff iptunnel_handle_offloads(struct sk_buff skb,
	151	bool csum_help,
	152	int gso_type_mask)
	153	{
	154	int err;
	155
	156	if (likely(!skb->encapsulation)) {
	157	skb_reset_inner_headers(skb);
	158	skb->encapsulation = 1;
	159	}
	160
	161	if (skb_is_gso(skb)) {
	162	err = skb_unclone(skb, GFP_ATOMIC);
	163	if (unlikely(err))
	164	goto error;
	165	skb_shinfo(skb)->gso_type \|= gso_type_mask;
	166	return skb;
	167	}
	168
7e2b10c1 TH	169	/* If packet is not gso and we are resolving any partial checksum,
	170	* clear encapsulation flag. This allows setting CHECKSUM_PARTIAL
	171	* on the outer header without confusing devices that implement
	172	* NETIF_F_IP_CSUM with encapsulation.
	173	*/
	174	if (csum_help)
	175	skb->encapsulation = 0;
	176
2d26f0a3 ED	177	if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) {
	178	err = skb_checksum_help(skb);
	179	if (unlikely(err))
	180	goto error;
	181	} else if (skb->ip_summed != CHECKSUM_PARTIAL)
	182	skb->ip_summed = CHECKSUM_NONE;
	183
	184	return skb;
	185	error:
	186	kfree_skb(skb);
	187	return ERR_PTR(err);
	188	}
	189	EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
ebe44f35 DM	190
	191	/* Often modified stats are per cpu, other are shared (netdev->stats) */
	192	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	193	struct rtnl_link_stats64 *tot)
	194	{
	195	int i;
	196
c24a5964 AD	197	netdev_stats_to_stats64(tot, &dev->stats);
c24a5964 AD	198
ebe44f35 DM	199	for_each_possible_cpu(i) {
	200	const struct pcpu_sw_netstats *tstats =
	201	per_cpu_ptr(dev->tstats, i);
	202	u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
	203	unsigned int start;
	204
	205	do {
57a7744e	206	start = u64_stats_fetch_begin_irq(&tstats->syncp);
ebe44f35 DM	207	rx_packets = tstats->rx_packets;
	208	tx_packets = tstats->tx_packets;
	209	rx_bytes = tstats->rx_bytes;
	210	tx_bytes = tstats->tx_bytes;
57a7744e	211	} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
ebe44f35 DM	212
	213	tot->rx_packets += rx_packets;
	214	tot->tx_packets += tx_packets;
	215	tot->rx_bytes += rx_bytes;
	216	tot->tx_bytes += tx_bytes;
	217	}
	218
ebe44f35 DM	219	return tot;
	220	}
	221	EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
3093fbe7	222
a1c234f9 JB	223	static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
	224	[LWTUNNEL_IP_ID] = { .type = NLA_U64 },
	225	[LWTUNNEL_IP_DST] = { .type = NLA_U32 },
	226	[LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
	227	[LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
	228	[LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
a1c234f9	229	[LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
3093fbe7 TG	230	};
	231
	232	static int ip_tun_build_state(struct net_device dev, struct nlattr attr,
127eb7cd	233	unsigned int family, const void *cfg,
3093fbe7 TG	234	struct lwtunnel_state **ts)
	235	{
	236	struct ip_tunnel_info *tun_info;
	237	struct lwtunnel_state *new_state;
a1c234f9	238	struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
3093fbe7 TG	239	int err;
3093fbe7 TG	240
a1c234f9	241	err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy);
3093fbe7 TG	242	if (err < 0)
	243	return err;
	244
	245	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
	246	if (!new_state)
	247	return -ENOMEM;
	248
	249	new_state->type = LWTUNNEL_ENCAP_IP;
	250
	251	tun_info = lwt_tun_info(new_state);
	252
a1c234f9	253	if (tb[LWTUNNEL_IP_ID])
30d3d83a	254	tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
3093fbe7	255
a1c234f9	256	if (tb[LWTUNNEL_IP_DST])
c1ea5d67	257	tun_info->key.u.ipv4.dst = nla_get_be32(tb[LWTUNNEL_IP_DST]);
3093fbe7	258
a1c234f9	259	if (tb[LWTUNNEL_IP_SRC])
c1ea5d67	260	tun_info->key.u.ipv4.src = nla_get_be32(tb[LWTUNNEL_IP_SRC]);
3093fbe7	261
a1c234f9	262	if (tb[LWTUNNEL_IP_TTL])
7c383fb2	263	tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
3093fbe7	264
a1c234f9	265	if (tb[LWTUNNEL_IP_TOS])
7c383fb2	266	tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
3093fbe7	267
a1c234f9	268	if (tb[LWTUNNEL_IP_FLAGS])
30d3d83a	269	tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]);
3093fbe7 TG	270
3093fbe7 TG	271	tun_info->mode = IP_TUNNEL_INFO_TX;
3093fbe7 TG	272	tun_info->options_len = 0;
	273
	274	*ts = new_state;
	275
	276	return 0;
	277	}
	278
	279	static int ip_tun_fill_encap_info(struct sk_buff *skb,
	280	struct lwtunnel_state *lwtstate)
	281	{
	282	struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
	283
30d3d83a	284	if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id) \|\|
c1ea5d67 JB	285	nla_put_be32(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) \|\|
c1ea5d67 JB	286	nla_put_be32(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) \|\|
7c383fb2 JB	287	nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) \|\|
7c383fb2 JB	288	nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) \|\|
30d3d83a	289	nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags))
3093fbe7 TG	290	return -ENOMEM;
	291
	292	return 0;
	293	}
	294
	295	static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
	296	{
a1c234f9 JB	297	return nla_total_size(8) /* LWTUNNEL_IP_ID */
	298	+ nla_total_size(4) /* LWTUNNEL_IP_DST */
	299	+ nla_total_size(4) /* LWTUNNEL_IP_SRC */
	300	+ nla_total_size(1) /* LWTUNNEL_IP_TOS */
	301	+ nla_total_size(1) /* LWTUNNEL_IP_TTL */
a1c234f9	302	+ nla_total_size(2); /* LWTUNNEL_IP_FLAGS */
3093fbe7 TG	303	}
3093fbe7 TG	304
2d798499 JB	305	static int ip_tun_cmp_encap(struct lwtunnel_state a, struct lwtunnel_state b)
	306	{
	307	return memcmp(lwt_tun_info(a), lwt_tun_info(b),
	308	sizeof(struct ip_tunnel_info));
	309	}
	310
3093fbe7 TG	311	static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
	312	.build_state = ip_tun_build_state,
	313	.fill_encap = ip_tun_fill_encap_info,
	314	.get_encap_size = ip_tun_encap_nlsize,
2d798499	315	.cmp_encap = ip_tun_cmp_encap,
3093fbe7 TG	316	};
3093fbe7 TG	317
32a2b002 JB	318	static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
	319	[LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
	320	[LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
	321	[LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
	322	[LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
	323	[LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
32a2b002 JB	324	[LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
	325	};
	326
	327	static int ip6_tun_build_state(struct net_device dev, struct nlattr attr,
127eb7cd	328	unsigned int family, const void *cfg,
32a2b002 JB	329	struct lwtunnel_state **ts)
	330	{
	331	struct ip_tunnel_info *tun_info;
	332	struct lwtunnel_state *new_state;
	333	struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
	334	int err;
	335
	336	err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy);
	337	if (err < 0)
	338	return err;
	339
	340	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
	341	if (!new_state)
	342	return -ENOMEM;
	343
	344	new_state->type = LWTUNNEL_ENCAP_IP6;
	345
	346	tun_info = lwt_tun_info(new_state);
	347
	348	if (tb[LWTUNNEL_IP6_ID])
30d3d83a	349	tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
32a2b002 JB	350
	351	if (tb[LWTUNNEL_IP6_DST])
	352	tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
	353
	354	if (tb[LWTUNNEL_IP6_SRC])
	355	tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
	356
	357	if (tb[LWTUNNEL_IP6_HOPLIMIT])
	358	tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
	359
	360	if (tb[LWTUNNEL_IP6_TC])
	361	tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
	362
32a2b002	363	if (tb[LWTUNNEL_IP6_FLAGS])
30d3d83a	364	tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
32a2b002	365
7f9562a1	366	tun_info->mode = IP_TUNNEL_INFO_TX \| IP_TUNNEL_INFO_IPV6;
32a2b002 JB	367	tun_info->options_len = 0;
	368
	369	*ts = new_state;
	370
	371	return 0;
	372	}
	373
	374	static int ip6_tun_fill_encap_info(struct sk_buff *skb,
	375	struct lwtunnel_state *lwtstate)
	376	{
	377	struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
	378
30d3d83a	379	if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id) \|\|
32a2b002 JB	380	nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) \|\|
	381	nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) \|\|
	382	nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.tos) \|\|
	383	nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.ttl) \|\|
30d3d83a	384	nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
32a2b002 JB	385	return -ENOMEM;
	386
	387	return 0;
	388	}
	389
	390	static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
	391	{
	392	return nla_total_size(8) /* LWTUNNEL_IP6_ID */
	393	+ nla_total_size(16) /* LWTUNNEL_IP6_DST */
	394	+ nla_total_size(16) /* LWTUNNEL_IP6_SRC */
	395	+ nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
	396	+ nla_total_size(1) /* LWTUNNEL_IP6_TC */
32a2b002 JB	397	+ nla_total_size(2); /* LWTUNNEL_IP6_FLAGS */
	398	}
	399
	400	static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
	401	.build_state = ip6_tun_build_state,
	402	.fill_encap = ip6_tun_fill_encap_info,
	403	.get_encap_size = ip6_tun_encap_nlsize,
	404	.cmp_encap = ip_tun_cmp_encap,
	405	};
	406
045a0fa0	407	void __init ip_tunnel_core_init(void)
3093fbe7 TG	408	{
3093fbe7 TG	409	lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
32a2b002	410	lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
3093fbe7	411	}
e7030878 TG	412
	413	struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
	414	EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
	415
	416	void ip_tunnel_need_metadata(void)
	417	{
	418	static_key_slow_inc(&ip_tunnel_metadata_cnt);
	419	}
	420	EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
	421
	422	void ip_tunnel_unneed_metadata(void)
	423	{
	424	static_key_slow_dec(&ip_tunnel_metadata_cnt);
	425	}
	426	EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);