[mirror_ubuntu-zesty-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/ip.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.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)

/* 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 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;
};

#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_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);

#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);
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, 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++;
	}
}

#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>
	12	#include <net/ip.h>
56328486	13	#include <net/netns/generic.h>
c5441932 PS	14	#include <net/rtnetlink.h>
	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
	25	/* 6rd prefix/relay information */
	26	#ifdef CONFIG_IPV6_SIT_6RD
	27	struct ip_tunnel_6rd_parm {
	28	struct in6_addr prefix;
	29	__be32 relay_prefix;
	30	u16 prefixlen;
	31	u16 relay_prefixlen;
	32	};
	33	#endif
	34
56328486 TH	35	struct ip_tunnel_encap {
	36	__u16 type;
	37	__u16 flags;
	38	__be16 sport;
	39	__be16 dport;
	40	};
	41
c5441932 PS	42	struct ip_tunnel_prl_entry {
	43	struct ip_tunnel_prl_entry __rcu *next;
	44	__be32 addr;
	45	u16 flags;
	46	struct rcu_head rcu_head;
	47	};
	48
9a4aa9af TH	49	struct ip_tunnel_dst {
9a4aa9af TH	50	struct dst_entry __rcu *dst;
95cb5745	51	__be32 saddr;
9a4aa9af TH	52	};
9a4aa9af TH	53
c5441932 PS	54	struct ip_tunnel {
	55	struct ip_tunnel __rcu *next;
	56	struct hlist_node hash_node;
	57	struct net_device *dev;
5e6700b3	58	struct net net; / netns for packet i/o */
c5441932 PS	59
	60	int err_count; /* Number of arrived ICMP errors */
	61	unsigned long err_time; /* Time when the last ICMP error
	62	* arrived */
	63
	64	/* These four fields used only by GRE */
	65	__u32 i_seqno; /* The last seen seqno */
	66	__u32 o_seqno; /* The last output seqno */
56328486	67	int tun_hlen; /* Precalculated header length */
c5441932 PS	68	int mlink;
c5441932 PS	69
9a4aa9af	70	struct ip_tunnel_dst __percpu *dst_cache;
7d442fab	71
c5441932 PS	72	struct ip_tunnel_parm parms;
c5441932 PS	73
56328486 TH	74	int encap_hlen; /* Encap header length (FOU,GUE) */
	75	struct ip_tunnel_encap encap;
	76
	77	int hlen; /* tun_hlen + encap_hlen */
	78
c5441932 PS	79	/* for SIT */
	80	#ifdef CONFIG_IPV6_SIT_6RD
	81	struct ip_tunnel_6rd_parm ip6rd;
	82	#endif
	83	struct ip_tunnel_prl_entry __rcu prl; / potential router list */
	84	unsigned int prl_count; /* # of entries in PRL */
	85	int ip_tnl_net_id;
	86	struct gro_cells gro_cells;
	87	};
	88
f5796684 JG	89	#define TUNNEL_CSUM __cpu_to_be16(0x01)
	90	#define TUNNEL_ROUTING __cpu_to_be16(0x02)
	91	#define TUNNEL_KEY __cpu_to_be16(0x04)
	92	#define TUNNEL_SEQ __cpu_to_be16(0x08)
	93	#define TUNNEL_STRICT __cpu_to_be16(0x10)
	94	#define TUNNEL_REC __cpu_to_be16(0x20)
	95	#define TUNNEL_VERSION __cpu_to_be16(0x40)
	96	#define TUNNEL_NO_KEY __cpu_to_be16(0x80)
9a628224	97	#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
f5796684 JG	98	#define TUNNEL_OAM __cpu_to_be16(0x0200)
f5796684 JG	99	#define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
1dd144cf TG	100	#define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
	101	#define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
	102
	103	#define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT \| TUNNEL_VXLAN_OPT)
c5441932 PS	104
	105	struct tnl_ptk_info {
	106	__be16 flags;
	107	__be16 proto;
	108	__be32 key;
	109	__be32 seq;
	110	};
	111
	112	#define PACKET_RCVD 0
	113	#define PACKET_REJECT 1
	114
6261d983	115	#define IP_TNL_HASH_BITS 7
c5441932 PS	116	#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
	117
	118	struct ip_tunnel_net {
c5441932	119	struct net_device *fb_tunnel_dev;
6261d983	120	struct hlist_head tunnels[IP_TNL_HASH_SIZE];
c5441932 PS	121	};
c5441932 PS	122
a8c5f90f TH	123	struct ip_tunnel_encap_ops {
	124	size_t (encap_hlen)(struct ip_tunnel_encap e);
	125	int (build_header)(struct sk_buff skb, struct ip_tunnel_encap *e,
	126	u8 protocol, struct flowi4 fl4);
	127	};
	128
	129	#define MAX_IPTUN_ENCAP_OPS 8
	130
	131	extern const struct ip_tunnel_encap_ops __rcu *
	132	iptun_encaps[MAX_IPTUN_ENCAP_OPS];
	133
	134	int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
	135	unsigned int num);
	136	int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
	137	unsigned int num);
	138
5243b6ac JG	139	#ifdef CONFIG_INET
5243b6ac JG	140
c5441932 PS	141	int ip_tunnel_init(struct net_device *dev);
	142	void ip_tunnel_uninit(struct net_device *dev);
	143	void ip_tunnel_dellink(struct net_device dev, struct list_head head);
d3b6f614 ED	144	int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
d3b6f614 ED	145	struct rtnl_link_ops ops, char devname);
c5441932	146
6c742e71	147	void ip_tunnel_delete_net(struct ip_tunnel_net itn, struct rtnl_link_ops ops);
c5441932 PS	148
c5441932 PS	149	void ip_tunnel_xmit(struct sk_buff skb, struct net_device dev,
bf3d6a8f	150	const struct iphdr *tnl_params, const u8 protocol);
c5441932	151	int ip_tunnel_ioctl(struct net_device dev, struct ip_tunnel_parm p, int cmd);
56328486 TH	152	int ip_tunnel_encap(struct sk_buff skb, struct ip_tunnel t,
56328486 TH	153	u8 protocol, struct flowi4 fl4);
c5441932 PS	154	int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
	155
	156	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	157	struct rtnl_link_stats64 *tot);
	158	struct ip_tunnel ip_tunnel_lookup(struct ip_tunnel_net itn,
	159	int link, __be16 flags,
	160	__be32 remote, __be32 local,
	161	__be32 key);
	162
	163	int ip_tunnel_rcv(struct ip_tunnel tunnel, struct sk_buff skb,
	164	const struct tnl_ptk_info *tpi, bool log_ecn_error);
	165	int ip_tunnel_changelink(struct net_device dev, struct nlattr tb[],
	166	struct ip_tunnel_parm *p);
	167	int ip_tunnel_newlink(struct net_device dev, struct nlattr tb[],
	168	struct ip_tunnel_parm *p);
	169	void ip_tunnel_setup(struct net_device *dev, int net_id);
cf71d2bc	170	void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
56328486 TH	171	int ip_tunnel_encap_setup(struct ip_tunnel *t,
56328486 TH	172	struct ip_tunnel_encap *ipencap);
c5441932 PS	173
	174	/* Extract dsfield from inner protocol */
	175	static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
	176	const struct sk_buff *skb)
	177	{
	178	if (skb->protocol == htons(ETH_P_IP))
	179	return iph->tos;
	180	else if (skb->protocol == htons(ETH_P_IPV6))
	181	return ipv6_get_dsfield((const struct ipv6hdr *)iph);
	182	else
	183	return 0;
	184	}
	185
	186	/* Propogate ECN bits out */
	187	static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
	188	const struct sk_buff *skb)
	189	{
	190	u8 inner = ip_tunnel_get_dsfield(iph, skb);
	191
	192	return INET_ECN_encapsulate(tos, inner);
	193	}
	194
3d7b46cd	195	int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
aad88724	196	int iptunnel_xmit(struct sock sk, struct rtable rt, struct sk_buff *skb,
0e6fbc5b	197	__be32 src, __be32 dst, __u8 proto,
963a88b3	198	__u8 tos, __u8 ttl, __be16 df, bool xnet);
0e6fbc5b	199
2d26f0a3 ED	200	struct sk_buff iptunnel_handle_offloads(struct sk_buff skb, bool gre_csum,
	201	int gso_type_mask);
	202
0e6fbc5b PS	203	static inline void iptunnel_xmit_stats(int err,
0e6fbc5b PS	204	struct net_device_stats *err_stats,
8f84985f	205	struct pcpu_sw_netstats __percpu *stats)
c5441932	206	{
0e6fbc5b	207	if (err > 0) {
8f84985f	208	struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
c5441932	209
c5441932	210	u64_stats_update_begin(&tstats->syncp);
0e6fbc5b	211	tstats->tx_bytes += err;
c5441932 PS	212	tstats->tx_packets++;
c5441932 PS	213	u64_stats_update_end(&tstats->syncp);
0e6fbc5b PS	214	} else if (err < 0) {
	215	err_stats->tx_errors++;
	216	err_stats->tx_aborted_errors++;
c5441932	217	} else {
0e6fbc5b	218	err_stats->tx_dropped++;
c5441932 PS	219	}
c5441932 PS	220	}
5243b6ac JG	221
	222	#endif /* CONFIG_INET */
	223
c5441932	224	#endif /* __NET_IP_TUNNELS_H */