[deliverable/linux.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>

#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 */
	__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;
	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.u.ipv4.src = saddr;
	tun_info->key.u.ipv4.dst = daddr;
	memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_IPV4_PAD,
	       0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
	tun_info->key.tos = tos;
	tun_info->key.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;

	tun_info->mode = 0;
}

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);
}

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);

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>
7f9562a1	7	#include <linux/socket.h>
c5441932 PS	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>
56328486	13	#include <net/netns/generic.h>
c5441932	14	#include <net/rtnetlink.h>
3093fbe7	15	#include <net/lwtunnel.h>
c5441932 PS	16
	17	#if IS_ENABLED(CONFIG_IPV6)
	18	#include <net/ipv6.h>
	19	#include <net/ip6_fib.h>
	20	#include <net/ip6_route.h>
	21	#endif
	22
	23	/* Keep error state on tunnel for 30 sec */
	24	#define IPTUNNEL_ERR_TIMEO (30*HZ)
	25
1d8fff90	26	/* Used to memset ip_tunnel padding. */
376534a3	27	#define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
1d8fff90	28
c1ea5d67 JB	29	/* Used to memset ipv4 address padding. */
	30	#define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst)
	31	#define IP_TUNNEL_KEY_IPV4_PAD_LEN \
	32	(FIELD_SIZEOF(struct ip_tunnel_key, u) - \
	33	FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))
	34
1d8fff90 TG	35	struct ip_tunnel_key {
1d8fff90 TG	36	__be64 tun_id;
c1ea5d67 JB	37	union {
	38	struct {
	39	__be32 src;
	40	__be32 dst;
	41	} ipv4;
	42	struct {
	43	struct in6_addr src;
	44	struct in6_addr dst;
	45	} ipv6;
	46	} u;
1d8fff90	47	__be16 tun_flags;
7c383fb2 JB	48	u8 tos; /* TOS for IPv4, TC for IPv6 */
7c383fb2 JB	49	u8 ttl; /* TTL for IPv4, HL for IPv6 */
1d8fff90 TG	50	__be16 tp_src;
1d8fff90 TG	51	__be16 tp_dst;
ac1cf399	52	};
1d8fff90	53
46fa062a JB	54	/* Flags for ip_tunnel_info mode. */
46fa062a JB	55	#define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
7f9562a1	56	#define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
ee122c79	57
1d8fff90 TG	58	struct ip_tunnel_info {
	59	struct ip_tunnel_key key;
	60	const void *options;
	61	u8 options_len;
ee122c79	62	u8 mode;
1d8fff90 TG	63	};
1d8fff90 TG	64
c5441932 PS	65	/* 6rd prefix/relay information */
	66	#ifdef CONFIG_IPV6_SIT_6RD
	67	struct ip_tunnel_6rd_parm {
	68	struct in6_addr prefix;
	69	__be32 relay_prefix;
	70	u16 prefixlen;
	71	u16 relay_prefixlen;
	72	};
	73	#endif
	74
56328486	75	struct ip_tunnel_encap {
6b8847c5 JB	76	u16 type;
6b8847c5 JB	77	u16 flags;
56328486 TH	78	__be16 sport;
	79	__be16 dport;
	80	};
	81
c5441932 PS	82	struct ip_tunnel_prl_entry {
	83	struct ip_tunnel_prl_entry __rcu *next;
	84	__be32 addr;
	85	u16 flags;
	86	struct rcu_head rcu_head;
	87	};
	88
9a4aa9af TH	89	struct ip_tunnel_dst {
9a4aa9af TH	90	struct dst_entry __rcu *dst;
95cb5745	91	__be32 saddr;
9a4aa9af TH	92	};
9a4aa9af TH	93
2e15ea39 PS	94	struct metadata_dst;
2e15ea39 PS	95
c5441932 PS	96	struct ip_tunnel {
	97	struct ip_tunnel __rcu *next;
	98	struct hlist_node hash_node;
	99	struct net_device *dev;
5e6700b3	100	struct net net; / netns for packet i/o */
c5441932 PS	101
	102	int err_count; /* Number of arrived ICMP errors */
	103	unsigned long err_time; /* Time when the last ICMP error
	104	* arrived */
	105
	106	/* These four fields used only by GRE */
6b8847c5 JB	107	u32 i_seqno; /* The last seen seqno */
6b8847c5 JB	108	u32 o_seqno; /* The last output seqno */
56328486	109	int tun_hlen; /* Precalculated header length */
c5441932 PS	110	int mlink;
c5441932 PS	111
9a4aa9af	112	struct ip_tunnel_dst __percpu *dst_cache;
7d442fab	113
c5441932 PS	114	struct ip_tunnel_parm parms;
c5441932 PS	115
56328486 TH	116	int encap_hlen; /* Encap header length (FOU,GUE) */
	117	struct ip_tunnel_encap encap;
	118
	119	int hlen; /* tun_hlen + encap_hlen */
	120
c5441932 PS	121	/* for SIT */
	122	#ifdef CONFIG_IPV6_SIT_6RD
	123	struct ip_tunnel_6rd_parm ip6rd;
	124	#endif
	125	struct ip_tunnel_prl_entry __rcu prl; / potential router list */
	126	unsigned int prl_count; /* # of entries in PRL */
	127	int ip_tnl_net_id;
	128	struct gro_cells gro_cells;
2e15ea39	129	bool collect_md;
c5441932 PS	130	};
c5441932 PS	131
f5796684 JG	132	#define TUNNEL_CSUM __cpu_to_be16(0x01)
	133	#define TUNNEL_ROUTING __cpu_to_be16(0x02)
	134	#define TUNNEL_KEY __cpu_to_be16(0x04)
	135	#define TUNNEL_SEQ __cpu_to_be16(0x08)
	136	#define TUNNEL_STRICT __cpu_to_be16(0x10)
	137	#define TUNNEL_REC __cpu_to_be16(0x20)
	138	#define TUNNEL_VERSION __cpu_to_be16(0x40)
	139	#define TUNNEL_NO_KEY __cpu_to_be16(0x80)
9a628224	140	#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
f5796684 JG	141	#define TUNNEL_OAM __cpu_to_be16(0x0200)
f5796684 JG	142	#define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
1dd144cf TG	143	#define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
	144	#define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
	145
	146	#define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT \| TUNNEL_VXLAN_OPT)
c5441932 PS	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
6261d983	158	#define IP_TNL_HASH_BITS 7
c5441932 PS	159	#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
	160
	161	struct ip_tunnel_net {
c5441932	162	struct net_device *fb_tunnel_dev;
6261d983	163	struct hlist_head tunnels[IP_TNL_HASH_SIZE];
2e15ea39	164	struct ip_tunnel __rcu *collect_md_tun;
c5441932 PS	165	};
c5441932 PS	166
a8c5f90f TH	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
1d8fff90 TG	183	static inline void __ip_tunnel_info_init(struct ip_tunnel_info *tun_info,
	184	__be32 saddr, __be32 daddr,
	185	u8 tos, u8 ttl,
	186	__be16 tp_src, __be16 tp_dst,
	187	__be64 tun_id, __be16 tun_flags,
	188	const void *opts, u8 opts_len)
	189	{
	190	tun_info->key.tun_id = tun_id;
c1ea5d67 JB	191	tun_info->key.u.ipv4.src = saddr;
	192	tun_info->key.u.ipv4.dst = daddr;
	193	memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_IPV4_PAD,
	194	0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
7c383fb2 JB	195	tun_info->key.tos = tos;
7c383fb2 JB	196	tun_info->key.ttl = ttl;
1d8fff90 TG	197	tun_info->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	tun_info->key.tp_src = tp_src;
	204	tun_info->key.tp_dst = tp_dst;
	205
	206	/* Clear struct padding. */
	207	if (sizeof(tun_info->key) != IP_TUNNEL_KEY_SIZE)
	208	memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_SIZE,
	209	0, sizeof(tun_info->key) - IP_TUNNEL_KEY_SIZE);
	210
	211	tun_info->options = opts;
	212	tun_info->options_len = opts_len;
7f9562a1 JB	213
7f9562a1 JB	214	tun_info->mode = 0;
1d8fff90 TG	215	}
	216
	217	static inline void ip_tunnel_info_init(struct ip_tunnel_info *tun_info,
	218	const struct iphdr *iph,
	219	__be16 tp_src, __be16 tp_dst,
	220	__be64 tun_id, __be16 tun_flags,
	221	const void *opts, u8 opts_len)
	222	{
	223	__ip_tunnel_info_init(tun_info, iph->saddr, iph->daddr,
	224	iph->tos, iph->ttl, tp_src, tp_dst,
	225	tun_id, tun_flags, opts, opts_len);
	226	}
	227
7f9562a1 JB	228	static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
	229	*tun_info)
	230	{
	231	return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
	232	}
	233
5243b6ac JG	234	#ifdef CONFIG_INET
5243b6ac JG	235
c5441932 PS	236	int ip_tunnel_init(struct net_device *dev);
	237	void ip_tunnel_uninit(struct net_device *dev);
	238	void ip_tunnel_dellink(struct net_device dev, struct list_head head);
1728d4fa	239	struct net ip_tunnel_get_link_net(const struct net_device dev);
1e99584b	240	int ip_tunnel_get_iflink(const struct net_device *dev);
d3b6f614 ED	241	int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
d3b6f614 ED	242	struct rtnl_link_ops ops, char devname);
c5441932	243
6c742e71	244	void ip_tunnel_delete_net(struct ip_tunnel_net itn, struct rtnl_link_ops ops);
c5441932 PS	245
c5441932 PS	246	void ip_tunnel_xmit(struct sk_buff skb, struct net_device dev,
bf3d6a8f	247	const struct iphdr *tnl_params, const u8 protocol);
c5441932	248	int ip_tunnel_ioctl(struct net_device dev, struct ip_tunnel_parm p, int cmd);
56328486 TH	249	int ip_tunnel_encap(struct sk_buff skb, struct ip_tunnel t,
56328486 TH	250	u8 protocol, struct flowi4 fl4);
c5441932 PS	251	int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
	252
	253	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	254	struct rtnl_link_stats64 *tot);
	255	struct ip_tunnel ip_tunnel_lookup(struct ip_tunnel_net itn,
	256	int link, __be16 flags,
	257	__be32 remote, __be32 local,
	258	__be32 key);
	259
	260	int ip_tunnel_rcv(struct ip_tunnel tunnel, struct sk_buff skb,
2e15ea39 PS	261	const struct tnl_ptk_info tpi, struct metadata_dst tun_dst,
2e15ea39 PS	262	bool log_ecn_error);
c5441932 PS	263	int ip_tunnel_changelink(struct net_device dev, struct nlattr tb[],
	264	struct ip_tunnel_parm *p);
	265	int ip_tunnel_newlink(struct net_device dev, struct nlattr tb[],
	266	struct ip_tunnel_parm *p);
	267	void ip_tunnel_setup(struct net_device *dev, int net_id);
cf71d2bc	268	void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
56328486 TH	269	int ip_tunnel_encap_setup(struct ip_tunnel *t,
56328486 TH	270	struct ip_tunnel_encap *ipencap);
c5441932 PS	271
	272	/* Extract dsfield from inner protocol */
	273	static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
	274	const struct sk_buff *skb)
	275	{
	276	if (skb->protocol == htons(ETH_P_IP))
	277	return iph->tos;
	278	else if (skb->protocol == htons(ETH_P_IPV6))
	279	return ipv6_get_dsfield((const struct ipv6hdr *)iph);
	280	else
	281	return 0;
	282	}
	283
	284	/* Propogate ECN bits out */
	285	static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
	286	const struct sk_buff *skb)
	287	{
	288	u8 inner = ip_tunnel_get_dsfield(iph, skb);
	289
	290	return INET_ECN_encapsulate(tos, inner);
	291	}
	292
3d7b46cd	293	int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
aad88724	294	int iptunnel_xmit(struct sock sk, struct rtable rt, struct sk_buff *skb,
6b8847c5 JB	295	__be32 src, __be32 dst, u8 proto,
6b8847c5 JB	296	u8 tos, u8 ttl, __be16 df, bool xnet);
0e6fbc5b	297
2d26f0a3 ED	298	struct sk_buff iptunnel_handle_offloads(struct sk_buff skb, bool gre_csum,
	299	int gso_type_mask);
	300
0e6fbc5b PS	301	static inline void iptunnel_xmit_stats(int err,
0e6fbc5b PS	302	struct net_device_stats *err_stats,
8f84985f	303	struct pcpu_sw_netstats __percpu *stats)
c5441932	304	{
0e6fbc5b	305	if (err > 0) {
8f84985f	306	struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
c5441932	307
c5441932	308	u64_stats_update_begin(&tstats->syncp);
0e6fbc5b	309	tstats->tx_bytes += err;
c5441932 PS	310	tstats->tx_packets++;
c5441932 PS	311	u64_stats_update_end(&tstats->syncp);
0e6fbc5b PS	312	} else if (err < 0) {
	313	err_stats->tx_errors++;
	314	err_stats->tx_aborted_errors++;
c5441932	315	} else {
0e6fbc5b	316	err_stats->tx_dropped++;
c5441932 PS	317	}
c5441932 PS	318	}
5243b6ac	319
ee122c79 TG	320	static inline void ip_tunnel_info_opts(struct ip_tunnel_info info, size_t n)
	321	{
	322	return info + 1;
	323	}
	324
3093fbe7 TG	325	static inline struct ip_tunnel_info lwt_tun_info(struct lwtunnel_state lwtstate)
	326	{
	327	return (struct ip_tunnel_info *)lwtstate->data;
	328	}
	329
e7030878 TG	330	extern struct static_key ip_tunnel_metadata_cnt;
	331
	332	/* Returns > 0 if metadata should be collected */
	333	static inline int ip_tunnel_collect_metadata(void)
	334	{
	335	return static_key_false(&ip_tunnel_metadata_cnt);
	336	}
	337
045a0fa0 TG	338	void __init ip_tunnel_core_init(void);
045a0fa0 TG	339
e7030878 TG	340	void ip_tunnel_need_metadata(void);
	341	void ip_tunnel_unneed_metadata(void);
	342
05283187 TG	343	#else /* CONFIG_INET */
	344
	345	static inline struct ip_tunnel_info lwt_tun_info(struct lwtunnel_state lwtstate)
	346	{
	347	return NULL;
	348	}
	349
	350	static inline void ip_tunnel_need_metadata(void)
	351	{
	352	}
	353
	354	static inline void ip_tunnel_unneed_metadata(void)
	355	{
	356	}
	357
5243b6ac JG	358	#endif /* CONFIG_INET */
5243b6ac JG	359
c5441932	360	#endif /* __NET_IP_TUNNELS_H */