[mirror_ubuntu-artful-kernel.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/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>

#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)

struct ip_tunnel_key {
	__be64			tun_id;
	__be32			ipv4_src;
	__be32			ipv4_dst;
	__be16			tun_flags;
	u8			ipv4_tos;
	u8			ipv4_ttl;
	__be16			tp_src;
	__be16			tp_dst;
};

/* Indicates whether the tunnel info structure represents receive
 * or transmit tunnel parameters.
 */
enum {
	IP_TUNNEL_INFO_RX,
	IP_TUNNEL_INFO_TX,
};

struct ip_tunnel_info {
	struct ip_tunnel_key	key;
	const void		*options;
	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 ip_tunnel_dst {
	struct dst_entry __rcu 		*dst;
	__be32				 saddr;
};

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 ip_tunnel_dst __percpu *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_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_info_init(struct ip_tunnel_info *tun_info,
					 __be32 saddr, __be32 daddr,
					 u8 tos, u8 ttl,
					 __be16 tp_src, __be16 tp_dst,
					 __be64 tun_id, __be16 tun_flags,
					 const void *opts, u8 opts_len)
{
	tun_info->key.tun_id = tun_id;
	tun_info->key.ipv4_src = saddr;
	tun_info->key.ipv4_dst = daddr;
	tun_info->key.ipv4_tos = tos;
	tun_info->key.ipv4_ttl = ttl;
	tun_info->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.
	 */
	tun_info->key.tp_src = tp_src;
	tun_info->key.tp_dst = tp_dst;

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

	tun_info->options = opts;
	tun_info->options_len = opts_len;
}

static inline void ip_tunnel_info_init(struct ip_tunnel_info *tun_info,
				       const struct iphdr *iph,
				       __be16 tp_src, __be16 tp_dst,
				       __be64 tun_id, __be16 tun_flags,
				       const void *opts, u8 opts_len)
{
	__ip_tunnel_info_init(tun_info, iph->saddr, iph->daddr,
			      iph->tos, iph->ttl, tp_src, tp_dst,
			      tun_id, tun_flags, opts, opts_len);
}

#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);

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);
void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
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);
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);

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

static inline void iptunnel_xmit_stats(int err,
				       struct net_device_stats *err_stats,
				       struct pcpu_sw_netstats __percpu *stats)
{
	if (err > 0) {
		struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);

		u64_stats_update_begin(&tstats->syncp);
		tstats->tx_bytes += err;
		tstats->tx_packets++;
		u64_stats_update_end(&tstats->syncp);
	} else if (err < 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, size_t n)
{
	return info + 1;
}

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)
{
}

#endif /* CONFIG_INET */

#endif /* __NET_IP_TUNNELS_H */
Commit	Line	Data
c5441932 PS	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/types.h>
	8	#include <linux/u64_stats_sync.h>
	9	#include <net/dsfield.h>
	10	#include <net/gro_cells.h>
	11	#include <net/inet_ecn.h>
56328486	12	#include <net/netns/generic.h>
c5441932	13	#include <net/rtnetlink.h>
3093fbe7	14	#include <net/lwtunnel.h>
c5441932 PS	15
	16	#if IS_ENABLED(CONFIG_IPV6)
	17	#include <net/ipv6.h>
	18	#include <net/ip6_fib.h>
	19	#include <net/ip6_route.h>
	20	#endif
	21
	22	/* Keep error state on tunnel for 30 sec */
	23	#define IPTUNNEL_ERR_TIMEO (30*HZ)
	24
1d8fff90	25	/* Used to memset ip_tunnel padding. */
376534a3	26	#define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
1d8fff90 TG	27
	28	struct ip_tunnel_key {
	29	__be64 tun_id;
	30	__be32 ipv4_src;
	31	__be32 ipv4_dst;
	32	__be16 tun_flags;
6b8847c5 JB	33	u8 ipv4_tos;
6b8847c5 JB	34	u8 ipv4_ttl;
1d8fff90 TG	35	__be16 tp_src;
1d8fff90 TG	36	__be16 tp_dst;
ac1cf399	37	};
1d8fff90	38
ee122c79 TG	39	/* Indicates whether the tunnel info structure represents receive
	40	* or transmit tunnel parameters.
	41	*/
	42	enum {
	43	IP_TUNNEL_INFO_RX,
	44	IP_TUNNEL_INFO_TX,
	45	};
	46
1d8fff90 TG	47	struct ip_tunnel_info {
	48	struct ip_tunnel_key key;
	49	const void *options;
	50	u8 options_len;
ee122c79	51	u8 mode;
1d8fff90 TG	52	};
1d8fff90 TG	53
c5441932 PS	54	/* 6rd prefix/relay information */
	55	#ifdef CONFIG_IPV6_SIT_6RD
	56	struct ip_tunnel_6rd_parm {
	57	struct in6_addr prefix;
	58	__be32 relay_prefix;
	59	u16 prefixlen;
	60	u16 relay_prefixlen;
	61	};
	62	#endif
	63
56328486	64	struct ip_tunnel_encap {
6b8847c5 JB	65	u16 type;
6b8847c5 JB	66	u16 flags;
56328486 TH	67	__be16 sport;
	68	__be16 dport;
	69	};
	70
c5441932 PS	71	struct ip_tunnel_prl_entry {
	72	struct ip_tunnel_prl_entry __rcu *next;
	73	__be32 addr;
	74	u16 flags;
	75	struct rcu_head rcu_head;
	76	};
	77
9a4aa9af TH	78	struct ip_tunnel_dst {
9a4aa9af TH	79	struct dst_entry __rcu *dst;
95cb5745	80	__be32 saddr;
9a4aa9af TH	81	};
9a4aa9af TH	82
2e15ea39 PS	83	struct metadata_dst;
2e15ea39 PS	84
c5441932 PS	85	struct ip_tunnel {
	86	struct ip_tunnel __rcu *next;
	87	struct hlist_node hash_node;
	88	struct net_device *dev;
5e6700b3	89	struct net net; / netns for packet i/o */
c5441932 PS	90
	91	int err_count; /* Number of arrived ICMP errors */
	92	unsigned long err_time; /* Time when the last ICMP error
	93	* arrived */
	94
	95	/* These four fields used only by GRE */
6b8847c5 JB	96	u32 i_seqno; /* The last seen seqno */
6b8847c5 JB	97	u32 o_seqno; /* The last output seqno */
56328486	98	int tun_hlen; /* Precalculated header length */
c5441932 PS	99	int mlink;
c5441932 PS	100
9a4aa9af	101	struct ip_tunnel_dst __percpu *dst_cache;
7d442fab	102
c5441932 PS	103	struct ip_tunnel_parm parms;
c5441932 PS	104
56328486 TH	105	int encap_hlen; /* Encap header length (FOU,GUE) */
	106	struct ip_tunnel_encap encap;
	107
	108	int hlen; /* tun_hlen + encap_hlen */
	109
c5441932 PS	110	/* for SIT */
	111	#ifdef CONFIG_IPV6_SIT_6RD
	112	struct ip_tunnel_6rd_parm ip6rd;
	113	#endif
	114	struct ip_tunnel_prl_entry __rcu prl; / potential router list */
	115	unsigned int prl_count; /* # of entries in PRL */
	116	int ip_tnl_net_id;
	117	struct gro_cells gro_cells;
2e15ea39	118	bool collect_md;
c5441932 PS	119	};
c5441932 PS	120
f5796684 JG	121	#define TUNNEL_CSUM __cpu_to_be16(0x01)
	122	#define TUNNEL_ROUTING __cpu_to_be16(0x02)
	123	#define TUNNEL_KEY __cpu_to_be16(0x04)
	124	#define TUNNEL_SEQ __cpu_to_be16(0x08)
	125	#define TUNNEL_STRICT __cpu_to_be16(0x10)
	126	#define TUNNEL_REC __cpu_to_be16(0x20)
	127	#define TUNNEL_VERSION __cpu_to_be16(0x40)
	128	#define TUNNEL_NO_KEY __cpu_to_be16(0x80)
9a628224	129	#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
f5796684 JG	130	#define TUNNEL_OAM __cpu_to_be16(0x0200)
f5796684 JG	131	#define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
1dd144cf TG	132	#define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
	133	#define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
	134
	135	#define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT \| TUNNEL_VXLAN_OPT)
c5441932 PS	136
	137	struct tnl_ptk_info {
	138	__be16 flags;
	139	__be16 proto;
	140	__be32 key;
	141	__be32 seq;
	142	};
	143
	144	#define PACKET_RCVD 0
	145	#define PACKET_REJECT 1
	146
6261d983	147	#define IP_TNL_HASH_BITS 7
c5441932 PS	148	#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
	149
	150	struct ip_tunnel_net {
c5441932	151	struct net_device *fb_tunnel_dev;
6261d983	152	struct hlist_head tunnels[IP_TNL_HASH_SIZE];
2e15ea39	153	struct ip_tunnel __rcu *collect_md_tun;
c5441932 PS	154	};
c5441932 PS	155
a8c5f90f TH	156	struct ip_tunnel_encap_ops {
	157	size_t (encap_hlen)(struct ip_tunnel_encap e);
	158	int (build_header)(struct sk_buff skb, struct ip_tunnel_encap *e,
	159	u8 protocol, struct flowi4 fl4);
	160	};
	161
	162	#define MAX_IPTUN_ENCAP_OPS 8
	163
	164	extern const struct ip_tunnel_encap_ops __rcu *
	165	iptun_encaps[MAX_IPTUN_ENCAP_OPS];
	166
	167	int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
	168	unsigned int num);
	169	int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
	170	unsigned int num);
	171
1d8fff90 TG	172	static inline void __ip_tunnel_info_init(struct ip_tunnel_info *tun_info,
	173	__be32 saddr, __be32 daddr,
	174	u8 tos, u8 ttl,
	175	__be16 tp_src, __be16 tp_dst,
	176	__be64 tun_id, __be16 tun_flags,
	177	const void *opts, u8 opts_len)
	178	{
	179	tun_info->key.tun_id = tun_id;
	180	tun_info->key.ipv4_src = saddr;
	181	tun_info->key.ipv4_dst = daddr;
	182	tun_info->key.ipv4_tos = tos;
	183	tun_info->key.ipv4_ttl = ttl;
	184	tun_info->key.tun_flags = tun_flags;
	185
	186	/* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
	187	* the upper tunnel are used.
	188	* E.g: GRE over IPSEC, the tp_src and tp_port are zero.
	189	*/
	190	tun_info->key.tp_src = tp_src;
	191	tun_info->key.tp_dst = tp_dst;
	192
	193	/* Clear struct padding. */
	194	if (sizeof(tun_info->key) != IP_TUNNEL_KEY_SIZE)
	195	memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_SIZE,
	196	0, sizeof(tun_info->key) - IP_TUNNEL_KEY_SIZE);
	197
	198	tun_info->options = opts;
	199	tun_info->options_len = opts_len;
	200	}
	201
	202	static inline void ip_tunnel_info_init(struct ip_tunnel_info *tun_info,
	203	const struct iphdr *iph,
	204	__be16 tp_src, __be16 tp_dst,
	205	__be64 tun_id, __be16 tun_flags,
	206	const void *opts, u8 opts_len)
	207	{
	208	__ip_tunnel_info_init(tun_info, iph->saddr, iph->daddr,
	209	iph->tos, iph->ttl, tp_src, tp_dst,
	210	tun_id, tun_flags, opts, opts_len);
	211	}
	212
5243b6ac JG	213	#ifdef CONFIG_INET
5243b6ac JG	214
c5441932 PS	215	int ip_tunnel_init(struct net_device *dev);
	216	void ip_tunnel_uninit(struct net_device *dev);
	217	void ip_tunnel_dellink(struct net_device dev, struct list_head head);
1728d4fa	218	struct net ip_tunnel_get_link_net(const struct net_device dev);
1e99584b	219	int ip_tunnel_get_iflink(const struct net_device *dev);
d3b6f614 ED	220	int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
d3b6f614 ED	221	struct rtnl_link_ops ops, char devname);
c5441932	222
6c742e71	223	void ip_tunnel_delete_net(struct ip_tunnel_net itn, struct rtnl_link_ops ops);
c5441932 PS	224
c5441932 PS	225	void ip_tunnel_xmit(struct sk_buff skb, struct net_device dev,
bf3d6a8f	226	const struct iphdr *tnl_params, const u8 protocol);
c5441932	227	int ip_tunnel_ioctl(struct net_device dev, struct ip_tunnel_parm p, int cmd);
56328486 TH	228	int ip_tunnel_encap(struct sk_buff skb, struct ip_tunnel t,
56328486 TH	229	u8 protocol, struct flowi4 fl4);
c5441932 PS	230	int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
	231
	232	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	233	struct rtnl_link_stats64 *tot);
	234	struct ip_tunnel ip_tunnel_lookup(struct ip_tunnel_net itn,
	235	int link, __be16 flags,
	236	__be32 remote, __be32 local,
	237	__be32 key);
	238
	239	int ip_tunnel_rcv(struct ip_tunnel tunnel, struct sk_buff skb,
2e15ea39 PS	240	const struct tnl_ptk_info tpi, struct metadata_dst tun_dst,
2e15ea39 PS	241	bool log_ecn_error);
c5441932 PS	242	int ip_tunnel_changelink(struct net_device dev, struct nlattr tb[],
	243	struct ip_tunnel_parm *p);
	244	int ip_tunnel_newlink(struct net_device dev, struct nlattr tb[],
	245	struct ip_tunnel_parm *p);
	246	void ip_tunnel_setup(struct net_device *dev, int net_id);
cf71d2bc	247	void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
56328486 TH	248	int ip_tunnel_encap_setup(struct ip_tunnel *t,
56328486 TH	249	struct ip_tunnel_encap *ipencap);
c5441932 PS	250
	251	/* Extract dsfield from inner protocol */
	252	static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
	253	const struct sk_buff *skb)
	254	{
	255	if (skb->protocol == htons(ETH_P_IP))
	256	return iph->tos;
	257	else if (skb->protocol == htons(ETH_P_IPV6))
	258	return ipv6_get_dsfield((const struct ipv6hdr *)iph);
	259	else
	260	return 0;
	261	}
	262
	263	/* Propogate ECN bits out */
	264	static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
	265	const struct sk_buff *skb)
	266	{
	267	u8 inner = ip_tunnel_get_dsfield(iph, skb);
	268
	269	return INET_ECN_encapsulate(tos, inner);
	270	}
	271
3d7b46cd	272	int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
aad88724	273	int iptunnel_xmit(struct sock sk, struct rtable rt, struct sk_buff *skb,
6b8847c5 JB	274	__be32 src, __be32 dst, u8 proto,
6b8847c5 JB	275	u8 tos, u8 ttl, __be16 df, bool xnet);
0e6fbc5b	276
2d26f0a3 ED	277	struct sk_buff iptunnel_handle_offloads(struct sk_buff skb, bool gre_csum,
	278	int gso_type_mask);
	279
0e6fbc5b PS	280	static inline void iptunnel_xmit_stats(int err,
0e6fbc5b PS	281	struct net_device_stats *err_stats,
8f84985f	282	struct pcpu_sw_netstats __percpu *stats)
c5441932	283	{
0e6fbc5b	284	if (err > 0) {
8f84985f	285	struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
c5441932	286
c5441932	287	u64_stats_update_begin(&tstats->syncp);
0e6fbc5b	288	tstats->tx_bytes += err;
c5441932 PS	289	tstats->tx_packets++;
c5441932 PS	290	u64_stats_update_end(&tstats->syncp);
0e6fbc5b PS	291	} else if (err < 0) {
	292	err_stats->tx_errors++;
	293	err_stats->tx_aborted_errors++;
c5441932	294	} else {
0e6fbc5b	295	err_stats->tx_dropped++;
c5441932 PS	296	}
c5441932 PS	297	}
5243b6ac	298
ee122c79 TG	299	static inline void ip_tunnel_info_opts(struct ip_tunnel_info info, size_t n)
	300	{
	301	return info + 1;
	302	}
	303
3093fbe7 TG	304	static inline struct ip_tunnel_info lwt_tun_info(struct lwtunnel_state lwtstate)
	305	{
	306	return (struct ip_tunnel_info *)lwtstate->data;
	307	}
	308
e7030878 TG	309	extern struct static_key ip_tunnel_metadata_cnt;
	310
	311	/* Returns > 0 if metadata should be collected */
	312	static inline int ip_tunnel_collect_metadata(void)
	313	{
	314	return static_key_false(&ip_tunnel_metadata_cnt);
	315	}
	316
045a0fa0 TG	317	void __init ip_tunnel_core_init(void);
045a0fa0 TG	318
e7030878 TG	319	void ip_tunnel_need_metadata(void);
	320	void ip_tunnel_unneed_metadata(void);
	321
05283187 TG	322	#else /* CONFIG_INET */
	323
	324	static inline struct ip_tunnel_info lwt_tun_info(struct lwtunnel_state lwtstate)
	325	{
	326	return NULL;
	327	}
	328
	329	static inline void ip_tunnel_need_metadata(void)
	330	{
	331	}
	332
	333	static inline void ip_tunnel_unneed_metadata(void)
	334	{
	335	}
	336
5243b6ac JG	337	#endif /* CONFIG_INET */
5243b6ac JG	338
c5441932	339	#endif /* __NET_IP_TUNNELS_H */