[linux-2.6-block.git] / include / net / ip_tunnels.h

#ifndef __NET_IP_TUNNELS_H
#define __NET_IP_TUNNELS_H 1

#include <linux/if_tunnel.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/types.h>
#include <linux/u64_stats_sync.h>
#include <net/dsfield.h>
#include <net/gro_cells.h>
#include <net/inet_ecn.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
#include <net/lwtunnel.h>
#include <net/dst_cache.h>

#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
#endif

/* Keep error state on tunnel for 30 sec */
#define IPTUNNEL_ERR_TIMEO	(30*HZ)

/* Used to memset ip_tunnel padding. */
#define IP_TUNNEL_KEY_SIZE	offsetofend(struct ip_tunnel_key, tp_dst)

/* Used to memset ipv4 address padding. */
#define IP_TUNNEL_KEY_IPV4_PAD	offsetofend(struct ip_tunnel_key, u.ipv4.dst)
#define IP_TUNNEL_KEY_IPV4_PAD_LEN				\
	(FIELD_SIZEOF(struct ip_tunnel_key, u) -		\
	 FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))

struct ip_tunnel_key {
	__be64			tun_id;
	union {
		struct {
			__be32	src;
			__be32	dst;
		} ipv4;
		struct {
			struct in6_addr src;
			struct in6_addr dst;
		} ipv6;
	} u;
	__be16			tun_flags;
	u8			tos;		/* TOS for IPv4, TC for IPv6 */
	u8			ttl;		/* TTL for IPv4, HL for IPv6 */
	__be32			label;		/* Flow Label for IPv6 */
	__be16			tp_src;
	__be16			tp_dst;
};

/* Flags for ip_tunnel_info mode. */
#define IP_TUNNEL_INFO_TX	0x01	/* represents tx tunnel parameters */
#define IP_TUNNEL_INFO_IPV6	0x02	/* key contains IPv6 addresses */

struct ip_tunnel_info {
	struct ip_tunnel_key	key;
#ifdef CONFIG_DST_CACHE
	struct dst_cache	dst_cache;
#endif
	u8			options_len;
	u8			mode;
};

/* 6rd prefix/relay information */
#ifdef CONFIG_IPV6_SIT_6RD
struct ip_tunnel_6rd_parm {
	struct in6_addr		prefix;
	__be32			relay_prefix;
	u16			prefixlen;
	u16			relay_prefixlen;
};
#endif

struct ip_tunnel_encap {
	u16			type;
	u16			flags;
	__be16			sport;
	__be16			dport;
};

struct ip_tunnel_prl_entry {
	struct ip_tunnel_prl_entry __rcu *next;
	__be32				addr;
	u16				flags;
	struct rcu_head			rcu_head;
};

struct metadata_dst;

struct ip_tunnel {
	struct ip_tunnel __rcu	*next;
	struct hlist_node hash_node;
	struct net_device	*dev;
	struct net		*net;	/* netns for packet i/o */

	int		err_count;	/* Number of arrived ICMP errors */
	unsigned long	err_time;	/* Time when the last ICMP error
					 * arrived */

	/* These four fields used only by GRE */
	u32		i_seqno;	/* The last seen seqno	*/
	u32		o_seqno;	/* The last output seqno */
	int		tun_hlen;	/* Precalculated header length */
	int		mlink;

	struct dst_cache dst_cache;

	struct ip_tunnel_parm parms;

	int		encap_hlen;	/* Encap header length (FOU,GUE) */
	struct ip_tunnel_encap encap;

	int		hlen;		/* tun_hlen + encap_hlen */

	/* for SIT */
#ifdef CONFIG_IPV6_SIT_6RD
	struct ip_tunnel_6rd_parm ip6rd;
#endif
	struct ip_tunnel_prl_entry __rcu *prl;	/* potential router list */
	unsigned int		prl_count;	/* # of entries in PRL */
	int			ip_tnl_net_id;
	struct gro_cells	gro_cells;
	bool			collect_md;
};

#define TUNNEL_CSUM		__cpu_to_be16(0x01)
#define TUNNEL_ROUTING		__cpu_to_be16(0x02)
#define TUNNEL_KEY		__cpu_to_be16(0x04)
#define TUNNEL_SEQ		__cpu_to_be16(0x08)
#define TUNNEL_STRICT		__cpu_to_be16(0x10)
#define TUNNEL_REC		__cpu_to_be16(0x20)
#define TUNNEL_VERSION		__cpu_to_be16(0x40)
#define TUNNEL_NO_KEY		__cpu_to_be16(0x80)
#define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100)
#define TUNNEL_OAM		__cpu_to_be16(0x0200)
#define TUNNEL_CRIT_OPT		__cpu_to_be16(0x0400)
#define TUNNEL_GENEVE_OPT	__cpu_to_be16(0x0800)
#define TUNNEL_VXLAN_OPT	__cpu_to_be16(0x1000)
#define TUNNEL_NOCACHE		__cpu_to_be16(0x2000)

#define TUNNEL_OPTIONS_PRESENT	(TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)

struct tnl_ptk_info {
	__be16 flags;
	__be16 proto;
	__be32 key;
	__be32 seq;
};

#define PACKET_RCVD	0
#define PACKET_REJECT	1

#define IP_TNL_HASH_BITS   7
#define IP_TNL_HASH_SIZE   (1 << IP_TNL_HASH_BITS)

struct ip_tunnel_net {
	struct net_device *fb_tunnel_dev;
	struct hlist_head tunnels[IP_TNL_HASH_SIZE];
	struct ip_tunnel __rcu *collect_md_tun;
};

struct ip_tunnel_encap_ops {
	size_t (*encap_hlen)(struct ip_tunnel_encap *e);
	int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
			    u8 *protocol, struct flowi4 *fl4);
};

#define MAX_IPTUN_ENCAP_OPS 8

extern const struct ip_tunnel_encap_ops __rcu *
		iptun_encaps[MAX_IPTUN_ENCAP_OPS];

int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
			    unsigned int num);
int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
			    unsigned int num);

static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
				      __be32 saddr, __be32 daddr,
				      u8 tos, u8 ttl, __be32 label,
				      __be16 tp_src, __be16 tp_dst,
				      __be64 tun_id, __be16 tun_flags)
{
	key->tun_id = tun_id;
	key->u.ipv4.src = saddr;
	key->u.ipv4.dst = daddr;
	memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
	       0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
	key->tos = tos;
	key->ttl = ttl;
	key->label = label;
	key->tun_flags = tun_flags;

	/* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
	 * the upper tunnel are used.
	 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
	 */
	key->tp_src = tp_src;
	key->tp_dst = tp_dst;

	/* Clear struct padding. */
	if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
		memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
		       0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
}

static inline bool
ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
			   const struct ip_tunnel_info *info)
{
	if (skb->mark)
		return false;
	if (!info)
		return true;
	if (info->key.tun_flags & TUNNEL_NOCACHE)
		return false;

	return true;
}

static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
					       *tun_info)
{
	return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
}

#ifdef CONFIG_INET

int ip_tunnel_init(struct net_device *dev);
void ip_tunnel_uninit(struct net_device *dev);
void  ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
struct net *ip_tunnel_get_link_net(const struct net_device *dev);
int ip_tunnel_get_iflink(const struct net_device *dev);
int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
		       struct rtnl_link_ops *ops, char *devname);

void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);

void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
		    const struct iphdr *tnl_params, const u8 protocol);
int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
		    u8 *protocol, struct flowi4 *fl4);
int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);

struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
						struct rtnl_link_stats64 *tot);
struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
				   int link, __be16 flags,
				   __be32 remote, __be32 local,
				   __be32 key);

int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
		  const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
		  bool log_ecn_error);
int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
			 struct ip_tunnel_parm *p);
int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
		      struct ip_tunnel_parm *p);
void ip_tunnel_setup(struct net_device *dev, int net_id);
int ip_tunnel_encap_setup(struct ip_tunnel *t,
			  struct ip_tunnel_encap *ipencap);

/* Extract dsfield from inner protocol */
static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
				       const struct sk_buff *skb)
{
	if (skb->protocol == htons(ETH_P_IP))
		return iph->tos;
	else if (skb->protocol == htons(ETH_P_IPV6))
		return ipv6_get_dsfield((const struct ipv6hdr *)iph);
	else
		return 0;
}

/* Propogate ECN bits out */
static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
				     const struct sk_buff *skb)
{
	u8 inner = ip_tunnel_get_dsfield(iph, skb);

	return INET_ECN_encapsulate(tos, inner);
}

int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto,
			 bool xnet);
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);
struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
					     gfp_t flags);

struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);

static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
{
	if (pkt_len > 0) {
		struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);

		u64_stats_update_begin(&tstats->syncp);
		tstats->tx_bytes += pkt_len;
		tstats->tx_packets++;
		u64_stats_update_end(&tstats->syncp);
		put_cpu_ptr(tstats);
	} else {
		struct net_device_stats *err_stats = &dev->stats;

		if (pkt_len < 0) {
			err_stats->tx_errors++;
			err_stats->tx_aborted_errors++;
		} else {
			err_stats->tx_dropped++;
		}
	}
}

static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
{
	return info + 1;
}

static inline void ip_tunnel_info_opts_get(void *to,
					   const struct ip_tunnel_info *info)
{
	memcpy(to, info + 1, info->options_len);
}

static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
					   const void *from, int len)
{
	memcpy(ip_tunnel_info_opts(info), from, len);
	info->options_len = len;
}

static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
{
	return (struct ip_tunnel_info *)lwtstate->data;
}

extern struct static_key ip_tunnel_metadata_cnt;

/* Returns > 0 if metadata should be collected */
static inline int ip_tunnel_collect_metadata(void)
{
	return static_key_false(&ip_tunnel_metadata_cnt);
}

void __init ip_tunnel_core_init(void);

void ip_tunnel_need_metadata(void);
void ip_tunnel_unneed_metadata(void);

#else /* CONFIG_INET */

static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
{
	return NULL;
}

static inline void ip_tunnel_need_metadata(void)
{
}

static inline void ip_tunnel_unneed_metadata(void)
{
}

static inline void ip_tunnel_info_opts_get(void *to,
					   const struct ip_tunnel_info *info)
{
}

static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
					   const void *from, int len)
{
	info->options_len = 0;
}

#endif /* CONFIG_INET */

#endif /* __NET_IP_TUNNELS_H */
Commit	Line	Data
	1	#ifndef __NET_IP_TUNNELS_H
	2	#define __NET_IP_TUNNELS_H 1
	3
	4	#include <linux/if_tunnel.h>
	5	#include <linux/netdevice.h>
	6	#include <linux/skbuff.h>
	7	#include <linux/socket.h>
	8	#include <linux/types.h>
	9	#include <linux/u64_stats_sync.h>
	10	#include <net/dsfield.h>
	11	#include <net/gro_cells.h>
	12	#include <net/inet_ecn.h>
	13	#include <net/netns/generic.h>
	14	#include <net/rtnetlink.h>
	15	#include <net/lwtunnel.h>
	16	#include <net/dst_cache.h>
	17
	18	#if IS_ENABLED(CONFIG_IPV6)
	19	#include <net/ipv6.h>
	20	#include <net/ip6_fib.h>
	21	#include <net/ip6_route.h>
	22	#endif
	23
	24	/* Keep error state on tunnel for 30 sec */
	25	#define IPTUNNEL_ERR_TIMEO (30*HZ)
	26
	27	/* Used to memset ip_tunnel padding. */
	28	#define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
	29
	30	/* Used to memset ipv4 address padding. */
	31	#define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst)
	32	#define IP_TUNNEL_KEY_IPV4_PAD_LEN \
	33	(FIELD_SIZEOF(struct ip_tunnel_key, u) - \
	34	FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))
	35
	36	struct ip_tunnel_key {
	37	__be64 tun_id;
	38	union {
	39	struct {
	40	__be32 src;
	41	__be32 dst;
	42	} ipv4;
	43	struct {
	44	struct in6_addr src;
	45	struct in6_addr dst;
	46	} ipv6;
	47	} u;
	48	__be16 tun_flags;
	49	u8 tos; /* TOS for IPv4, TC for IPv6 */
	50	u8 ttl; /* TTL for IPv4, HL for IPv6 */
	51	__be32 label; /* Flow Label for IPv6 */
	52	__be16 tp_src;
	53	__be16 tp_dst;
	54	};
	55
	56	/* Flags for ip_tunnel_info mode. */
	57	#define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
	58	#define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
	59
	60	struct ip_tunnel_info {
	61	struct ip_tunnel_key key;
	62	#ifdef CONFIG_DST_CACHE
	63	struct dst_cache dst_cache;
	64	#endif
	65	u8 options_len;
	66	u8 mode;
	67	};
	68
	69	/* 6rd prefix/relay information */
	70	#ifdef CONFIG_IPV6_SIT_6RD
	71	struct ip_tunnel_6rd_parm {
	72	struct in6_addr prefix;
	73	__be32 relay_prefix;
	74	u16 prefixlen;
	75	u16 relay_prefixlen;
	76	};
	77	#endif
	78
	79	struct ip_tunnel_encap {
	80	u16 type;
	81	u16 flags;
	82	__be16 sport;
	83	__be16 dport;
	84	};
	85
	86	struct ip_tunnel_prl_entry {
	87	struct ip_tunnel_prl_entry __rcu *next;
	88	__be32 addr;
	89	u16 flags;
	90	struct rcu_head rcu_head;
	91	};
	92
	93	struct metadata_dst;
	94
	95	struct ip_tunnel {
	96	struct ip_tunnel __rcu *next;
	97	struct hlist_node hash_node;
	98	struct net_device *dev;
	99	struct net net; / netns for packet i/o */
	100
	101	int err_count; /* Number of arrived ICMP errors */
	102	unsigned long err_time; /* Time when the last ICMP error
	103	* arrived */
	104
	105	/* These four fields used only by GRE */
	106	u32 i_seqno; /* The last seen seqno */
	107	u32 o_seqno; /* The last output seqno */
	108	int tun_hlen; /* Precalculated header length */
	109	int mlink;
	110
	111	struct dst_cache dst_cache;
	112
	113	struct ip_tunnel_parm parms;
	114
	115	int encap_hlen; /* Encap header length (FOU,GUE) */
	116	struct ip_tunnel_encap encap;
	117
	118	int hlen; /* tun_hlen + encap_hlen */
	119
	120	/* for SIT */
	121	#ifdef CONFIG_IPV6_SIT_6RD
	122	struct ip_tunnel_6rd_parm ip6rd;
	123	#endif
	124	struct ip_tunnel_prl_entry __rcu prl; / potential router list */
	125	unsigned int prl_count; /* # of entries in PRL */
	126	int ip_tnl_net_id;
	127	struct gro_cells gro_cells;
	128	bool collect_md;
	129	};
	130
	131	#define TUNNEL_CSUM __cpu_to_be16(0x01)
	132	#define TUNNEL_ROUTING __cpu_to_be16(0x02)
	133	#define TUNNEL_KEY __cpu_to_be16(0x04)
	134	#define TUNNEL_SEQ __cpu_to_be16(0x08)
	135	#define TUNNEL_STRICT __cpu_to_be16(0x10)
	136	#define TUNNEL_REC __cpu_to_be16(0x20)
	137	#define TUNNEL_VERSION __cpu_to_be16(0x40)
	138	#define TUNNEL_NO_KEY __cpu_to_be16(0x80)
	139	#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
	140	#define TUNNEL_OAM __cpu_to_be16(0x0200)
	141	#define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
	142	#define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
	143	#define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
	144	#define TUNNEL_NOCACHE __cpu_to_be16(0x2000)
	145
	146	#define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT \| TUNNEL_VXLAN_OPT)
	147
	148	struct tnl_ptk_info {
	149	__be16 flags;
	150	__be16 proto;
	151	__be32 key;
	152	__be32 seq;
	153	};
	154
	155	#define PACKET_RCVD 0
	156	#define PACKET_REJECT 1
	157
	158	#define IP_TNL_HASH_BITS 7
	159	#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
	160
	161	struct ip_tunnel_net {
	162	struct net_device *fb_tunnel_dev;
	163	struct hlist_head tunnels[IP_TNL_HASH_SIZE];
	164	struct ip_tunnel __rcu *collect_md_tun;
	165	};
	166
	167	struct ip_tunnel_encap_ops {
	168	size_t (encap_hlen)(struct ip_tunnel_encap e);
	169	int (build_header)(struct sk_buff skb, struct ip_tunnel_encap *e,
	170	u8 protocol, struct flowi4 fl4);
	171	};
	172
	173	#define MAX_IPTUN_ENCAP_OPS 8
	174
	175	extern const struct ip_tunnel_encap_ops __rcu *
	176	iptun_encaps[MAX_IPTUN_ENCAP_OPS];
	177
	178	int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
	179	unsigned int num);
	180	int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
	181	unsigned int num);
	182
	183	static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
	184	__be32 saddr, __be32 daddr,
	185	u8 tos, u8 ttl, __be32 label,
	186	__be16 tp_src, __be16 tp_dst,
	187	__be64 tun_id, __be16 tun_flags)
	188	{
	189	key->tun_id = tun_id;
	190	key->u.ipv4.src = saddr;
	191	key->u.ipv4.dst = daddr;
	192	memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
	193	0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
	194	key->tos = tos;
	195	key->ttl = ttl;
	196	key->label = label;
	197	key->tun_flags = tun_flags;
	198
	199	/* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
	200	* the upper tunnel are used.
	201	* E.g: GRE over IPSEC, the tp_src and tp_port are zero.
	202	*/
	203	key->tp_src = tp_src;
	204	key->tp_dst = tp_dst;
	205
	206	/* Clear struct padding. */
	207	if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
	208	memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
	209	0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
	210	}
	211
	212	static inline bool
	213	ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
	214	const struct ip_tunnel_info *info)
	215	{
	216	if (skb->mark)
	217	return false;
	218	if (!info)
	219	return true;
	220	if (info->key.tun_flags & TUNNEL_NOCACHE)
	221	return false;
	222
	223	return true;
	224	}
	225
	226	static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
	227	*tun_info)
	228	{
	229	return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
	230	}
	231
	232	#ifdef CONFIG_INET
	233
	234	int ip_tunnel_init(struct net_device *dev);
	235	void ip_tunnel_uninit(struct net_device *dev);
	236	void ip_tunnel_dellink(struct net_device dev, struct list_head head);
	237	struct net ip_tunnel_get_link_net(const struct net_device dev);
	238	int ip_tunnel_get_iflink(const struct net_device *dev);
	239	int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
	240	struct rtnl_link_ops ops, char devname);
	241
	242	void ip_tunnel_delete_net(struct ip_tunnel_net itn, struct rtnl_link_ops ops);
	243
	244	void ip_tunnel_xmit(struct sk_buff skb, struct net_device dev,
	245	const struct iphdr *tnl_params, const u8 protocol);
	246	int ip_tunnel_ioctl(struct net_device dev, struct ip_tunnel_parm p, int cmd);
	247	int ip_tunnel_encap(struct sk_buff skb, struct ip_tunnel t,
	248	u8 protocol, struct flowi4 fl4);
	249	int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
	250	int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
	251
	252	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	253	struct rtnl_link_stats64 *tot);
	254	struct ip_tunnel ip_tunnel_lookup(struct ip_tunnel_net itn,
	255	int link, __be16 flags,
	256	__be32 remote, __be32 local,
	257	__be32 key);
	258
	259	int ip_tunnel_rcv(struct ip_tunnel tunnel, struct sk_buff skb,
	260	const struct tnl_ptk_info tpi, struct metadata_dst tun_dst,
	261	bool log_ecn_error);
	262	int ip_tunnel_changelink(struct net_device dev, struct nlattr tb[],
	263	struct ip_tunnel_parm *p);
	264	int ip_tunnel_newlink(struct net_device dev, struct nlattr tb[],
	265	struct ip_tunnel_parm *p);
	266	void ip_tunnel_setup(struct net_device *dev, int net_id);
	267	int ip_tunnel_encap_setup(struct ip_tunnel *t,
	268	struct ip_tunnel_encap *ipencap);
	269
	270	/* Extract dsfield from inner protocol */
	271	static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
	272	const struct sk_buff *skb)
	273	{
	274	if (skb->protocol == htons(ETH_P_IP))
	275	return iph->tos;
	276	else if (skb->protocol == htons(ETH_P_IPV6))
	277	return ipv6_get_dsfield((const struct ipv6hdr *)iph);
	278	else
	279	return 0;
	280	}
	281
	282	/* Propogate ECN bits out */
	283	static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
	284	const struct sk_buff *skb)
	285	{
	286	u8 inner = ip_tunnel_get_dsfield(iph, skb);
	287
	288	return INET_ECN_encapsulate(tos, inner);
	289	}
	290
	291	int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto,
	292	bool xnet);
	293	void iptunnel_xmit(struct sock sk, struct rtable rt, struct sk_buff *skb,
	294	__be32 src, __be32 dst, u8 proto,
	295	u8 tos, u8 ttl, __be16 df, bool xnet);
	296	struct metadata_dst iptunnel_metadata_reply(struct metadata_dst md,
	297	gfp_t flags);
	298
	299	struct sk_buff iptunnel_handle_offloads(struct sk_buff skb, int gso_type_mask);
	300
	301	static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
	302	{
	303	if (pkt_len > 0) {
	304	struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
	305
	306	u64_stats_update_begin(&tstats->syncp);
	307	tstats->tx_bytes += pkt_len;
	308	tstats->tx_packets++;
	309	u64_stats_update_end(&tstats->syncp);
	310	put_cpu_ptr(tstats);
	311	} else {
	312	struct net_device_stats *err_stats = &dev->stats;
	313
	314	if (pkt_len < 0) {
	315	err_stats->tx_errors++;
	316	err_stats->tx_aborted_errors++;
	317	} else {
	318	err_stats->tx_dropped++;
	319	}
	320	}
	321	}
	322
	323	static inline void ip_tunnel_info_opts(struct ip_tunnel_info info)
	324	{
	325	return info + 1;
	326	}
	327
	328	static inline void ip_tunnel_info_opts_get(void *to,
	329	const struct ip_tunnel_info *info)
	330	{
	331	memcpy(to, info + 1, info->options_len);
	332	}
	333
	334	static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
	335	const void *from, int len)
	336	{
	337	memcpy(ip_tunnel_info_opts(info), from, len);
	338	info->options_len = len;
	339	}
	340
	341	static inline struct ip_tunnel_info lwt_tun_info(struct lwtunnel_state lwtstate)
	342	{
	343	return (struct ip_tunnel_info *)lwtstate->data;
	344	}
	345
	346	extern struct static_key ip_tunnel_metadata_cnt;
	347
	348	/* Returns > 0 if metadata should be collected */
	349	static inline int ip_tunnel_collect_metadata(void)
	350	{
	351	return static_key_false(&ip_tunnel_metadata_cnt);
	352	}
	353
	354	void __init ip_tunnel_core_init(void);
	355
	356	void ip_tunnel_need_metadata(void);
	357	void ip_tunnel_unneed_metadata(void);
	358
	359	#else /* CONFIG_INET */
	360
	361	static inline struct ip_tunnel_info lwt_tun_info(struct lwtunnel_state lwtstate)
	362	{
	363	return NULL;
	364	}
	365
	366	static inline void ip_tunnel_need_metadata(void)
	367	{
	368	}
	369
	370	static inline void ip_tunnel_unneed_metadata(void)
	371	{
	372	}
	373
	374	static inline void ip_tunnel_info_opts_get(void *to,
	375	const struct ip_tunnel_info *info)
	376	{
	377	}
	378
	379	static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
	380	const void *from, int len)
	381	{
	382	info->options_len = 0;
	383	}
	384
	385	#endif /* CONFIG_INET */
	386
	387	#endif /* __NET_IP_TUNNELS_H */