[deliverable/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/ip6_tunnel.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>

const struct ip_tunnel_encap_ops __rcu *
		iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
EXPORT_SYMBOL(iptun_encaps);

const struct ip6_tnl_encap_ops __rcu *
		ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
EXPORT_SYMBOL(ip6tun_encaps);

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;
	int skb_iif = skb->skb_iif;
	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)));

	if (skb_iif && proto == IPPROTO_UDP) {
		/* Arrived from an ingress interface and got udp encapuslated.
		 * The encapsulated network segment length may exceed dst mtu.
		 * Allow IP Fragmentation of segments.
		 */
		IPCB(skb)->flags |= IPSKB_FRAG_SEGS;
	}

	/* 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, bool raw_proto, bool xnet)
{
	if (unlikely(!pskb_may_pull(skb, hdr_len)))
		return -ENOMEM;

	skb_pull_rcsum(skb, hdr_len);

	if (!raw_proto && 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;
	}

	skb_clear_hash_if_not_l4(skb);
	skb->vlan_tci = 0;
	skb_set_queue_mapping(skb, 0);
	skb_scrub_packet(skb, xnet);

	return iptunnel_pull_offloads(skb);
}
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);

int iptunnel_handle_offloads(struct sk_buff *skb,
			     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_header_unclone(skb, GFP_ATOMIC);
		if (unlikely(err))
			return err;
		skb_shinfo(skb)->gso_type |= gso_type_mask;
		return 0;
	}

	if (skb->ip_summed != CHECKSUM_PARTIAL) {
		skb->ip_summed = CHECKSUM_NONE;
		/* We clear encapsulation here to prevent badly-written
		 * drivers potentially deciding to offload an inner checksum
		 * if we set CHECKSUM_PARTIAL on the outer header.
		 * This should go away when the drivers are all fixed.
		 */
		skb->encapsulation = 0;
	}

	return 0;
}
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_in_addr(tb[LWTUNNEL_IP_DST]);

	if (tb[LWTUNNEL_IP_SRC])
		tun_info->key.u.ipv4.src = nla_get_in_addr(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,
			 LWTUNNEL_IP_PAD) ||
	    nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
	    nla_put_in_addr(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_64bit(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,
			 LWTUNNEL_IP6_PAD) ||
	    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_TC, tun_info->key.tos) ||
	    nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, 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_64bit(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)
{
	/* If you land here, make sure whether increasing ip_tunnel_info's
	 * options_len is a reasonable choice with its usage in front ends
	 * (f.e., it's part of flow keys, etc).
	 */
	BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);

	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>
058214a4	40	#include <net/ip6_tunnel.h>
0e6fbc5b PS	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>
63d008a4	49	#include <net/dst_metadata.h>
0e6fbc5b	50
55c2bc14 TH	51	const struct ip_tunnel_encap_ops __rcu *
	52	iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
	53	EXPORT_SYMBOL(iptun_encaps);
	54
058214a4 TH	55	const struct ip6_tnl_encap_ops __rcu *
	56	ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
	57	EXPORT_SYMBOL(ip6tun_encaps);
	58
039f5062 PS	59	void iptunnel_xmit(struct sock sk, struct rtable rt, struct sk_buff *skb,
	60	__be32 src, __be32 dst, __u8 proto,
	61	__u8 tos, __u8 ttl, __be16 df, bool xnet)
0e6fbc5b	62	{
bc22a0e2	63	int pkt_len = skb->len - skb_inner_network_offset(skb);
f859b0f6	64	struct net *net = dev_net(rt->dst.dev);
039f5062	65	struct net_device *dev = skb->dev;
b8247f09	66	int skb_iif = skb->skb_iif;
0e6fbc5b PS	67	struct iphdr *iph;
	68	int err;
	69
963a88b3 ND	70	skb_scrub_packet(skb, xnet);
963a88b3 ND	71
7539fadc	72	skb_clear_hash(skb);
0e6fbc5b PS	73	skb_dst_set(skb, &rt->dst);
	74	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
	75
b8247f09 SL	76	if (skb_iif && proto == IPPROTO_UDP) {
	77	/* Arrived from an ingress interface and got udp encapuslated.
	78	* The encapsulated network segment length may exceed dst mtu.
	79	* Allow IP Fragmentation of segments.
	80	*/
	81	IPCB(skb)->flags \|= IPSKB_FRAG_SEGS;
	82	}
	83
0e6fbc5b	84	/* Push down and install the IP header. */
78a3694d	85	skb_push(skb, sizeof(struct iphdr));
0e6fbc5b PS	86	skb_reset_network_header(skb);
	87
	88	iph = ip_hdr(skb);
	89
	90	iph->version = 4;
	91	iph->ihl = sizeof(struct iphdr) >> 2;
	92	iph->frag_off = df;
	93	iph->protocol = proto;
	94	iph->tos = tos;
	95	iph->daddr = dst;
	96	iph->saddr = src;
	97	iph->ttl = ttl;
f859b0f6	98	__ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
0e6fbc5b	99
33224b16	100	err = ip_local_out(net, sk, skb);
0e6fbc5b PS	101	if (unlikely(net_xmit_eval(err)))
0e6fbc5b PS	102	pkt_len = 0;
039f5062	103	iptunnel_xmit_stats(dev, pkt_len);
0e6fbc5b PS	104	}
0e6fbc5b PS	105	EXPORT_SYMBOL_GPL(iptunnel_xmit);
3d7b46cd	106
a6d5bbf3 JB	107	int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
a6d5bbf3 JB	108	__be16 inner_proto, bool raw_proto, bool xnet)
3d7b46cd PS	109	{
	110	if (unlikely(!pskb_may_pull(skb, hdr_len)))
	111	return -ENOMEM;
	112
	113	skb_pull_rcsum(skb, hdr_len);
	114
a6d5bbf3	115	if (!raw_proto && inner_proto == htons(ETH_P_TEB)) {
1245dfc8	116	struct ethhdr *eh;
3d7b46cd PS	117
	118	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
	119	return -ENOMEM;
	120
1245dfc8	121	eh = (struct ethhdr *)skb->data;
d181ddca	122	if (likely(eth_proto_is_802_3(eh->h_proto)))
3d7b46cd PS	123	skb->protocol = eh->h_proto;
	124	else
	125	skb->protocol = htons(ETH_P_802_2);
	126
	127	} else {
	128	skb->protocol = inner_proto;
	129	}
	130
7539fadc	131	skb_clear_hash_if_not_l4(skb);
3d7b46cd PS	132	skb->vlan_tci = 0;
3d7b46cd PS	133	skb_set_queue_mapping(skb, 0);
7f290c94	134	skb_scrub_packet(skb, xnet);
a09a4c8d JG	135
a09a4c8d JG	136	return iptunnel_pull_offloads(skb);
3d7b46cd	137	}
a6d5bbf3	138	EXPORT_SYMBOL_GPL(__iptunnel_pull_header);
2d26f0a3	139
63d008a4 JB	140	struct metadata_dst iptunnel_metadata_reply(struct metadata_dst md,
	141	gfp_t flags)
	142	{
	143	struct metadata_dst *res;
	144	struct ip_tunnel_info dst, src;
	145
	146	if (!md \|\| md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
	147	return NULL;
	148
	149	res = metadata_dst_alloc(0, flags);
	150	if (!res)
	151	return NULL;
	152
	153	dst = &res->u.tun_info;
	154	src = &md->u.tun_info;
	155	dst->key.tun_id = src->key.tun_id;
	156	if (src->mode & IP_TUNNEL_INFO_IPV6)
	157	memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
	158	sizeof(struct in6_addr));
	159	else
	160	dst->key.u.ipv4.dst = src->key.u.ipv4.src;
	161	dst->mode = src->mode \| IP_TUNNEL_INFO_TX;
	162
	163	return res;
	164	}
	165	EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
	166
aed069df AD	167	int iptunnel_handle_offloads(struct sk_buff *skb,
aed069df AD	168	int gso_type_mask)
2d26f0a3 ED	169	{
	170	int err;
	171
	172	if (likely(!skb->encapsulation)) {
	173	skb_reset_inner_headers(skb);
	174	skb->encapsulation = 1;
	175	}
	176
	177	if (skb_is_gso(skb)) {
9580bf2e	178	err = skb_header_unclone(skb, GFP_ATOMIC);
2d26f0a3	179	if (unlikely(err))
aed069df	180	return err;
2d26f0a3	181	skb_shinfo(skb)->gso_type \|= gso_type_mask;
aed069df	182	return 0;
2d26f0a3 ED	183	}
2d26f0a3 ED	184
6fa79666	185	if (skb->ip_summed != CHECKSUM_PARTIAL) {
2d26f0a3	186	skb->ip_summed = CHECKSUM_NONE;
6fa79666 EC	187	/* We clear encapsulation here to prevent badly-written
	188	* drivers potentially deciding to offload an inner checksum
	189	* if we set CHECKSUM_PARTIAL on the outer header.
	190	* This should go away when the drivers are all fixed.
	191	*/
179bc67f EC	192	skb->encapsulation = 0;
179bc67f EC	193	}
2d26f0a3	194
aed069df	195	return 0;
2d26f0a3 ED	196	}
2d26f0a3 ED	197	EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
ebe44f35 DM	198
	199	/* Often modified stats are per cpu, other are shared (netdev->stats) */
	200	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	201	struct rtnl_link_stats64 *tot)
	202	{
	203	int i;
	204
c24a5964 AD	205	netdev_stats_to_stats64(tot, &dev->stats);
c24a5964 AD	206
ebe44f35 DM	207	for_each_possible_cpu(i) {
	208	const struct pcpu_sw_netstats *tstats =
	209	per_cpu_ptr(dev->tstats, i);
	210	u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
	211	unsigned int start;
	212
	213	do {
57a7744e	214	start = u64_stats_fetch_begin_irq(&tstats->syncp);
ebe44f35 DM	215	rx_packets = tstats->rx_packets;
	216	tx_packets = tstats->tx_packets;
	217	rx_bytes = tstats->rx_bytes;
	218	tx_bytes = tstats->tx_bytes;
57a7744e	219	} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
ebe44f35 DM	220
	221	tot->rx_packets += rx_packets;
	222	tot->tx_packets += tx_packets;
	223	tot->rx_bytes += rx_bytes;
	224	tot->tx_bytes += tx_bytes;
	225	}
	226
ebe44f35 DM	227	return tot;
	228	}
	229	EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
3093fbe7	230
a1c234f9 JB	231	static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
	232	[LWTUNNEL_IP_ID] = { .type = NLA_U64 },
	233	[LWTUNNEL_IP_DST] = { .type = NLA_U32 },
	234	[LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
	235	[LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
	236	[LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
a1c234f9	237	[LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
3093fbe7 TG	238	};
	239
	240	static int ip_tun_build_state(struct net_device dev, struct nlattr attr,
127eb7cd	241	unsigned int family, const void *cfg,
3093fbe7 TG	242	struct lwtunnel_state **ts)
	243	{
	244	struct ip_tunnel_info *tun_info;
	245	struct lwtunnel_state *new_state;
a1c234f9	246	struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
3093fbe7 TG	247	int err;
3093fbe7 TG	248
a1c234f9	249	err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy);
3093fbe7 TG	250	if (err < 0)
	251	return err;
	252
	253	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
	254	if (!new_state)
	255	return -ENOMEM;
	256
	257	new_state->type = LWTUNNEL_ENCAP_IP;
	258
	259	tun_info = lwt_tun_info(new_state);
	260
a1c234f9	261	if (tb[LWTUNNEL_IP_ID])
30d3d83a	262	tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
3093fbe7	263
a1c234f9	264	if (tb[LWTUNNEL_IP_DST])
7822ce73	265	tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
3093fbe7	266
a1c234f9	267	if (tb[LWTUNNEL_IP_SRC])
7822ce73	268	tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
3093fbe7	269
a1c234f9	270	if (tb[LWTUNNEL_IP_TTL])
7c383fb2	271	tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
3093fbe7	272
a1c234f9	273	if (tb[LWTUNNEL_IP_TOS])
7c383fb2	274	tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
3093fbe7	275
a1c234f9	276	if (tb[LWTUNNEL_IP_FLAGS])
30d3d83a	277	tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]);
3093fbe7 TG	278
3093fbe7 TG	279	tun_info->mode = IP_TUNNEL_INFO_TX;
3093fbe7 TG	280	tun_info->options_len = 0;
	281
	282	*ts = new_state;
	283
	284	return 0;
	285	}
	286
	287	static int ip_tun_fill_encap_info(struct sk_buff *skb,
	288	struct lwtunnel_state *lwtstate)
	289	{
	290	struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
	291
b46f6ded ND	292	if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
b46f6ded ND	293	LWTUNNEL_IP_PAD) \|\|
7822ce73 HY	294	nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) \|\|
7822ce73 HY	295	nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) \|\|
7c383fb2 JB	296	nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) \|\|
7c383fb2 JB	297	nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) \|\|
30d3d83a	298	nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags))
3093fbe7 TG	299	return -ENOMEM;
	300
	301	return 0;
	302	}
	303
	304	static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
	305	{
b46f6ded	306	return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */
a1c234f9 JB	307	+ nla_total_size(4) /* LWTUNNEL_IP_DST */
	308	+ nla_total_size(4) /* LWTUNNEL_IP_SRC */
	309	+ nla_total_size(1) /* LWTUNNEL_IP_TOS */
	310	+ nla_total_size(1) /* LWTUNNEL_IP_TTL */
a1c234f9	311	+ nla_total_size(2); /* LWTUNNEL_IP_FLAGS */
3093fbe7 TG	312	}
3093fbe7 TG	313
2d798499 JB	314	static int ip_tun_cmp_encap(struct lwtunnel_state a, struct lwtunnel_state b)
	315	{
	316	return memcmp(lwt_tun_info(a), lwt_tun_info(b),
	317	sizeof(struct ip_tunnel_info));
	318	}
	319
3093fbe7 TG	320	static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
	321	.build_state = ip_tun_build_state,
	322	.fill_encap = ip_tun_fill_encap_info,
	323	.get_encap_size = ip_tun_encap_nlsize,
2d798499	324	.cmp_encap = ip_tun_cmp_encap,
3093fbe7 TG	325	};
3093fbe7 TG	326
32a2b002 JB	327	static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
	328	[LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
	329	[LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
	330	[LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
	331	[LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
	332	[LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
32a2b002 JB	333	[LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
	334	};
	335
	336	static int ip6_tun_build_state(struct net_device dev, struct nlattr attr,
127eb7cd	337	unsigned int family, const void *cfg,
32a2b002 JB	338	struct lwtunnel_state **ts)
	339	{
	340	struct ip_tunnel_info *tun_info;
	341	struct lwtunnel_state *new_state;
	342	struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
	343	int err;
	344
	345	err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy);
	346	if (err < 0)
	347	return err;
	348
	349	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
	350	if (!new_state)
	351	return -ENOMEM;
	352
	353	new_state->type = LWTUNNEL_ENCAP_IP6;
	354
	355	tun_info = lwt_tun_info(new_state);
	356
	357	if (tb[LWTUNNEL_IP6_ID])
30d3d83a	358	tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
32a2b002 JB	359
	360	if (tb[LWTUNNEL_IP6_DST])
	361	tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
	362
	363	if (tb[LWTUNNEL_IP6_SRC])
	364	tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
	365
	366	if (tb[LWTUNNEL_IP6_HOPLIMIT])
	367	tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
	368
	369	if (tb[LWTUNNEL_IP6_TC])
	370	tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
	371
32a2b002	372	if (tb[LWTUNNEL_IP6_FLAGS])
30d3d83a	373	tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
32a2b002	374
7f9562a1	375	tun_info->mode = IP_TUNNEL_INFO_TX \| IP_TUNNEL_INFO_IPV6;
32a2b002 JB	376	tun_info->options_len = 0;
	377
	378	*ts = new_state;
	379
	380	return 0;
	381	}
	382
	383	static int ip6_tun_fill_encap_info(struct sk_buff *skb,
	384	struct lwtunnel_state *lwtstate)
	385	{
	386	struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
	387
b46f6ded ND	388	if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
b46f6ded ND	389	LWTUNNEL_IP6_PAD) \|\|
32a2b002 JB	390	nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) \|\|
32a2b002 JB	391	nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) \|\|
995096a0 QA	392	nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) \|\|
995096a0 QA	393	nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) \|\|
30d3d83a	394	nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
32a2b002 JB	395	return -ENOMEM;
	396
	397	return 0;
	398	}
	399
	400	static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
	401	{
b46f6ded	402	return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */
32a2b002 JB	403	+ nla_total_size(16) /* LWTUNNEL_IP6_DST */
	404	+ nla_total_size(16) /* LWTUNNEL_IP6_SRC */
	405	+ nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
	406	+ nla_total_size(1) /* LWTUNNEL_IP6_TC */
32a2b002 JB	407	+ nla_total_size(2); /* LWTUNNEL_IP6_FLAGS */
	408	}
	409
	410	static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
	411	.build_state = ip6_tun_build_state,
	412	.fill_encap = ip6_tun_fill_encap_info,
	413	.get_encap_size = ip6_tun_encap_nlsize,
	414	.cmp_encap = ip_tun_cmp_encap,
	415	};
	416
045a0fa0	417	void __init ip_tunnel_core_init(void)
3093fbe7	418	{
fca5fdf6 DB	419	/* If you land here, make sure whether increasing ip_tunnel_info's
	420	* options_len is a reasonable choice with its usage in front ends
	421	* (f.e., it's part of flow keys, etc).
	422	*/
	423	BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
	424
3093fbe7	425	lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
32a2b002	426	lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
3093fbe7	427	}
e7030878 TG	428
	429	struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
	430	EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
	431
	432	void ip_tunnel_need_metadata(void)
	433	{
	434	static_key_slow_inc(&ip_tunnel_metadata_cnt);
	435	}
	436	EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
	437
	438	void ip_tunnel_unneed_metadata(void)
	439	{
	440	static_key_slow_dec(&ip_tunnel_metadata_cnt);
	441	}
	442	EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);