[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>

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 net *net = dev_net(rt->dst.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;
	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);
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
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	53	{
bc22a0e2	54	int pkt_len = skb->len - skb_inner_network_offset(skb);
f859b0f6	55	struct net *net = dev_net(rt->dst.dev);
0e6fbc5b PS	56	struct iphdr *iph;
	57	int err;
	58
963a88b3 ND	59	skb_scrub_packet(skb, xnet);
963a88b3 ND	60
7539fadc	61	skb_clear_hash(skb);
0e6fbc5b PS	62	skb_dst_set(skb, &rt->dst);
	63	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
	64
	65	/* Push down and install the IP header. */
78a3694d	66	skb_push(skb, sizeof(struct iphdr));
0e6fbc5b PS	67	skb_reset_network_header(skb);
	68
	69	iph = ip_hdr(skb);
	70
	71	iph->version = 4;
	72	iph->ihl = sizeof(struct iphdr) >> 2;
	73	iph->frag_off = df;
	74	iph->protocol = proto;
	75	iph->tos = tos;
	76	iph->daddr = dst;
	77	iph->saddr = src;
	78	iph->ttl = ttl;
f859b0f6	79	__ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
0e6fbc5b	80
33224b16	81	err = ip_local_out(net, 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	121
63d008a4 JB	122	struct metadata_dst iptunnel_metadata_reply(struct metadata_dst md,
	123	gfp_t flags)
	124	{
	125	struct metadata_dst *res;
	126	struct ip_tunnel_info dst, src;
	127
	128	if (!md \|\| md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
	129	return NULL;
	130
	131	res = metadata_dst_alloc(0, flags);
	132	if (!res)
	133	return NULL;
	134
	135	dst = &res->u.tun_info;
	136	src = &md->u.tun_info;
	137	dst->key.tun_id = src->key.tun_id;
	138	if (src->mode & IP_TUNNEL_INFO_IPV6)
	139	memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
	140	sizeof(struct in6_addr));
	141	else
	142	dst->key.u.ipv4.dst = src->key.u.ipv4.src;
	143	dst->mode = src->mode \| IP_TUNNEL_INFO_TX;
	144
	145	return res;
	146	}
	147	EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
	148
2d26f0a3 ED	149	struct sk_buff iptunnel_handle_offloads(struct sk_buff skb,
	150	bool csum_help,
	151	int gso_type_mask)
	152	{
	153	int err;
	154
	155	if (likely(!skb->encapsulation)) {
	156	skb_reset_inner_headers(skb);
	157	skb->encapsulation = 1;
	158	}
	159
	160	if (skb_is_gso(skb)) {
	161	err = skb_unclone(skb, GFP_ATOMIC);
	162	if (unlikely(err))
	163	goto error;
	164	skb_shinfo(skb)->gso_type \|= gso_type_mask;
	165	return skb;
	166	}
	167
7e2b10c1 TH	168	/* If packet is not gso and we are resolving any partial checksum,
	169	* clear encapsulation flag. This allows setting CHECKSUM_PARTIAL
	170	* on the outer header without confusing devices that implement
	171	* NETIF_F_IP_CSUM with encapsulation.
	172	*/
	173	if (csum_help)
	174	skb->encapsulation = 0;
	175
2d26f0a3 ED	176	if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) {
	177	err = skb_checksum_help(skb);
	178	if (unlikely(err))
	179	goto error;
	180	} else if (skb->ip_summed != CHECKSUM_PARTIAL)
	181	skb->ip_summed = CHECKSUM_NONE;
	182
	183	return skb;
	184	error:
	185	kfree_skb(skb);
	186	return ERR_PTR(err);
	187	}
	188	EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
ebe44f35 DM	189
	190	/* Often modified stats are per cpu, other are shared (netdev->stats) */
	191	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	192	struct rtnl_link_stats64 *tot)
	193	{
	194	int i;
	195
c24a5964 AD	196	netdev_stats_to_stats64(tot, &dev->stats);
c24a5964 AD	197
ebe44f35 DM	198	for_each_possible_cpu(i) {
	199	const struct pcpu_sw_netstats *tstats =
	200	per_cpu_ptr(dev->tstats, i);
	201	u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
	202	unsigned int start;
	203
	204	do {
57a7744e	205	start = u64_stats_fetch_begin_irq(&tstats->syncp);
ebe44f35 DM	206	rx_packets = tstats->rx_packets;
	207	tx_packets = tstats->tx_packets;
	208	rx_bytes = tstats->rx_bytes;
	209	tx_bytes = tstats->tx_bytes;
57a7744e	210	} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
ebe44f35 DM	211
	212	tot->rx_packets += rx_packets;
	213	tot->tx_packets += tx_packets;
	214	tot->rx_bytes += rx_bytes;
	215	tot->tx_bytes += tx_bytes;
	216	}
	217
ebe44f35 DM	218	return tot;
	219	}
	220	EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
3093fbe7	221
a1c234f9 JB	222	static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
	223	[LWTUNNEL_IP_ID] = { .type = NLA_U64 },
	224	[LWTUNNEL_IP_DST] = { .type = NLA_U32 },
	225	[LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
	226	[LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
	227	[LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
a1c234f9	228	[LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
3093fbe7 TG	229	};
	230
	231	static int ip_tun_build_state(struct net_device dev, struct nlattr attr,
127eb7cd	232	unsigned int family, const void *cfg,
3093fbe7 TG	233	struct lwtunnel_state **ts)
	234	{
	235	struct ip_tunnel_info *tun_info;
	236	struct lwtunnel_state *new_state;
a1c234f9	237	struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
3093fbe7 TG	238	int err;
3093fbe7 TG	239
a1c234f9	240	err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy);
3093fbe7 TG	241	if (err < 0)
	242	return err;
	243
	244	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
	245	if (!new_state)
	246	return -ENOMEM;
	247
	248	new_state->type = LWTUNNEL_ENCAP_IP;
	249
	250	tun_info = lwt_tun_info(new_state);
	251
a1c234f9 JB	252	if (tb[LWTUNNEL_IP_ID])
a1c234f9 JB	253	tun_info->key.tun_id = nla_get_u64(tb[LWTUNNEL_IP_ID]);
3093fbe7	254
a1c234f9	255	if (tb[LWTUNNEL_IP_DST])
c1ea5d67	256	tun_info->key.u.ipv4.dst = nla_get_be32(tb[LWTUNNEL_IP_DST]);
3093fbe7	257
a1c234f9	258	if (tb[LWTUNNEL_IP_SRC])
c1ea5d67	259	tun_info->key.u.ipv4.src = nla_get_be32(tb[LWTUNNEL_IP_SRC]);
3093fbe7	260
a1c234f9	261	if (tb[LWTUNNEL_IP_TTL])
7c383fb2	262	tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
3093fbe7	263
a1c234f9	264	if (tb[LWTUNNEL_IP_TOS])
7c383fb2	265	tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
3093fbe7	266
a1c234f9 JB	267	if (tb[LWTUNNEL_IP_FLAGS])
a1c234f9 JB	268	tun_info->key.tun_flags = nla_get_u16(tb[LWTUNNEL_IP_FLAGS]);
3093fbe7 TG	269
3093fbe7 TG	270	tun_info->mode = IP_TUNNEL_INFO_TX;
3093fbe7 TG	271	tun_info->options_len = 0;
	272
	273	*ts = new_state;
	274
	275	return 0;
	276	}
	277
	278	static int ip_tun_fill_encap_info(struct sk_buff *skb,
	279	struct lwtunnel_state *lwtstate)
	280	{
	281	struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
	282
a1c234f9	283	if (nla_put_u64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id) \|\|
c1ea5d67 JB	284	nla_put_be32(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) \|\|
c1ea5d67 JB	285	nla_put_be32(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) \|\|
7c383fb2 JB	286	nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) \|\|
7c383fb2 JB	287	nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) \|\|
a1c234f9	288	nla_put_u16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags))
3093fbe7 TG	289	return -ENOMEM;
	290
	291	return 0;
	292	}
	293
	294	static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
	295	{
a1c234f9 JB	296	return nla_total_size(8) /* LWTUNNEL_IP_ID */
	297	+ nla_total_size(4) /* LWTUNNEL_IP_DST */
	298	+ nla_total_size(4) /* LWTUNNEL_IP_SRC */
	299	+ nla_total_size(1) /* LWTUNNEL_IP_TOS */
	300	+ nla_total_size(1) /* LWTUNNEL_IP_TTL */
a1c234f9	301	+ nla_total_size(2); /* LWTUNNEL_IP_FLAGS */
3093fbe7 TG	302	}
3093fbe7 TG	303
2d798499 JB	304	static int ip_tun_cmp_encap(struct lwtunnel_state a, struct lwtunnel_state b)
	305	{
	306	return memcmp(lwt_tun_info(a), lwt_tun_info(b),
	307	sizeof(struct ip_tunnel_info));
	308	}
	309
3093fbe7 TG	310	static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
	311	.build_state = ip_tun_build_state,
	312	.fill_encap = ip_tun_fill_encap_info,
	313	.get_encap_size = ip_tun_encap_nlsize,
2d798499	314	.cmp_encap = ip_tun_cmp_encap,
3093fbe7 TG	315	};
3093fbe7 TG	316
32a2b002 JB	317	static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
	318	[LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
	319	[LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
	320	[LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
	321	[LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
	322	[LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
32a2b002 JB	323	[LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
	324	};
	325
	326	static int ip6_tun_build_state(struct net_device dev, struct nlattr attr,
127eb7cd	327	unsigned int family, const void *cfg,
32a2b002 JB	328	struct lwtunnel_state **ts)
	329	{
	330	struct ip_tunnel_info *tun_info;
	331	struct lwtunnel_state *new_state;
	332	struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
	333	int err;
	334
	335	err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy);
	336	if (err < 0)
	337	return err;
	338
	339	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
	340	if (!new_state)
	341	return -ENOMEM;
	342
	343	new_state->type = LWTUNNEL_ENCAP_IP6;
	344
	345	tun_info = lwt_tun_info(new_state);
	346
	347	if (tb[LWTUNNEL_IP6_ID])
	348	tun_info->key.tun_id = nla_get_u64(tb[LWTUNNEL_IP6_ID]);
	349
	350	if (tb[LWTUNNEL_IP6_DST])
	351	tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
	352
	353	if (tb[LWTUNNEL_IP6_SRC])
	354	tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
	355
	356	if (tb[LWTUNNEL_IP6_HOPLIMIT])
	357	tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
	358
	359	if (tb[LWTUNNEL_IP6_TC])
	360	tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
	361
32a2b002 JB	362	if (tb[LWTUNNEL_IP6_FLAGS])
	363	tun_info->key.tun_flags = nla_get_u16(tb[LWTUNNEL_IP6_FLAGS]);
	364
7f9562a1	365	tun_info->mode = IP_TUNNEL_INFO_TX \| IP_TUNNEL_INFO_IPV6;
32a2b002 JB	366	tun_info->options_len = 0;
	367
	368	*ts = new_state;
	369
	370	return 0;
	371	}
	372
	373	static int ip6_tun_fill_encap_info(struct sk_buff *skb,
	374	struct lwtunnel_state *lwtstate)
	375	{
	376	struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
	377
	378	if (nla_put_u64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id) \|\|
	379	nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) \|\|
	380	nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) \|\|
	381	nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.tos) \|\|
	382	nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.ttl) \|\|
32a2b002 JB	383	nla_put_u16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
	384	return -ENOMEM;
	385
	386	return 0;
	387	}
	388
	389	static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
	390	{
	391	return nla_total_size(8) /* LWTUNNEL_IP6_ID */
	392	+ nla_total_size(16) /* LWTUNNEL_IP6_DST */
	393	+ nla_total_size(16) /* LWTUNNEL_IP6_SRC */
	394	+ nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
	395	+ nla_total_size(1) /* LWTUNNEL_IP6_TC */
32a2b002 JB	396	+ nla_total_size(2); /* LWTUNNEL_IP6_FLAGS */
	397	}
	398
	399	static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
	400	.build_state = ip6_tun_build_state,
	401	.fill_encap = ip6_tun_fill_encap_info,
	402	.get_encap_size = ip6_tun_encap_nlsize,
	403	.cmp_encap = ip_tun_cmp_encap,
	404	};
	405
045a0fa0	406	void __init ip_tunnel_core_init(void)
3093fbe7 TG	407	{
3093fbe7 TG	408	lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
32a2b002	409	lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
3093fbe7	410	}
e7030878 TG	411
	412	struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
	413	EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
	414
	415	void ip_tunnel_need_metadata(void)
	416	{
	417	static_key_slow_inc(&ip_tunnel_metadata_cnt);
	418	}
	419	EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
	420
	421	void ip_tunnel_unneed_metadata(void)
	422	{
	423	static_key_slow_dec(&ip_tunnel_metadata_cnt);
	424	}
	425	EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);