[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/ip.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_prl_entry {
	struct ip_tunnel_prl_entry __rcu *next;
	__be32				addr;
	u16				flags;
	struct rcu_head			rcu_head;
};

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		hlen;		/* Precalculated header length */
	int		mlink;

	struct		dst_entry __rcu *dst_cache;
	spinlock_t	dst_lock;

	struct ip_tunnel_parm parms;

	/* 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)

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];
};

#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_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);

/* 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 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_tstats __percpu *stats)
{
	if (err > 0) {
		struct pcpu_tstats *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>
	13	#include <net/rtnetlink.h>
	14
	15	#if IS_ENABLED(CONFIG_IPV6)
	16	#include <net/ipv6.h>
	17	#include <net/ip6_fib.h>
	18	#include <net/ip6_route.h>
	19	#endif
	20
	21	/* Keep error state on tunnel for 30 sec */
	22	#define IPTUNNEL_ERR_TIMEO (30*HZ)
	23
	24	/* 6rd prefix/relay information */
	25	#ifdef CONFIG_IPV6_SIT_6RD
	26	struct ip_tunnel_6rd_parm {
	27	struct in6_addr prefix;
	28	__be32 relay_prefix;
	29	u16 prefixlen;
	30	u16 relay_prefixlen;
	31	};
	32	#endif
	33
	34	struct ip_tunnel_prl_entry {
	35	struct ip_tunnel_prl_entry __rcu *next;
	36	__be32 addr;
	37	u16 flags;
	38	struct rcu_head rcu_head;
	39	};
	40
	41	struct ip_tunnel {
	42	struct ip_tunnel __rcu *next;
	43	struct hlist_node hash_node;
	44	struct net_device *dev;
5e6700b3	45	struct net net; / netns for packet i/o */
c5441932 PS	46
	47	int err_count; /* Number of arrived ICMP errors */
	48	unsigned long err_time; /* Time when the last ICMP error
	49	* arrived */
	50
	51	/* These four fields used only by GRE */
	52	__u32 i_seqno; /* The last seen seqno */
	53	__u32 o_seqno; /* The last output seqno */
	54	int hlen; /* Precalculated header length */
	55	int mlink;
	56
7d442fab TH	57	struct dst_entry __rcu *dst_cache;
	58	spinlock_t dst_lock;
	59
c5441932 PS	60	struct ip_tunnel_parm parms;
	61
	62	/* for SIT */
	63	#ifdef CONFIG_IPV6_SIT_6RD
	64	struct ip_tunnel_6rd_parm ip6rd;
	65	#endif
	66	struct ip_tunnel_prl_entry __rcu prl; / potential router list */
	67	unsigned int prl_count; /* # of entries in PRL */
	68	int ip_tnl_net_id;
	69	struct gro_cells gro_cells;
	70	};
	71
	72	#define TUNNEL_CSUM __cpu_to_be16(0x01)
	73	#define TUNNEL_ROUTING __cpu_to_be16(0x02)
	74	#define TUNNEL_KEY __cpu_to_be16(0x04)
	75	#define TUNNEL_SEQ __cpu_to_be16(0x08)
	76	#define TUNNEL_STRICT __cpu_to_be16(0x10)
	77	#define TUNNEL_REC __cpu_to_be16(0x20)
	78	#define TUNNEL_VERSION __cpu_to_be16(0x40)
	79	#define TUNNEL_NO_KEY __cpu_to_be16(0x80)
9a628224	80	#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
c5441932 PS	81
	82	struct tnl_ptk_info {
	83	__be16 flags;
	84	__be16 proto;
	85	__be32 key;
	86	__be32 seq;
	87	};
	88
	89	#define PACKET_RCVD 0
	90	#define PACKET_REJECT 1
	91
6261d983	92	#define IP_TNL_HASH_BITS 7
c5441932 PS	93	#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
	94
	95	struct ip_tunnel_net {
c5441932	96	struct net_device *fb_tunnel_dev;
6261d983	97	struct hlist_head tunnels[IP_TNL_HASH_SIZE];
c5441932 PS	98	};
c5441932 PS	99
5243b6ac JG	100	#ifdef CONFIG_INET
5243b6ac JG	101
c5441932 PS	102	int ip_tunnel_init(struct net_device *dev);
	103	void ip_tunnel_uninit(struct net_device *dev);
	104	void ip_tunnel_dellink(struct net_device dev, struct list_head head);
d3b6f614 ED	105	int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
d3b6f614 ED	106	struct rtnl_link_ops ops, char devname);
c5441932	107
6c742e71	108	void ip_tunnel_delete_net(struct ip_tunnel_net itn, struct rtnl_link_ops ops);
c5441932 PS	109
c5441932 PS	110	void ip_tunnel_xmit(struct sk_buff skb, struct net_device dev,
bf3d6a8f	111	const struct iphdr *tnl_params, const u8 protocol);
c5441932 PS	112	int ip_tunnel_ioctl(struct net_device dev, struct ip_tunnel_parm p, int cmd);
	113	int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
	114
	115	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	116	struct rtnl_link_stats64 *tot);
	117	struct ip_tunnel ip_tunnel_lookup(struct ip_tunnel_net itn,
	118	int link, __be16 flags,
	119	__be32 remote, __be32 local,
	120	__be32 key);
	121
	122	int ip_tunnel_rcv(struct ip_tunnel tunnel, struct sk_buff skb,
	123	const struct tnl_ptk_info *tpi, bool log_ecn_error);
	124	int ip_tunnel_changelink(struct net_device dev, struct nlattr tb[],
	125	struct ip_tunnel_parm *p);
	126	int ip_tunnel_newlink(struct net_device dev, struct nlattr tb[],
	127	struct ip_tunnel_parm *p);
	128	void ip_tunnel_setup(struct net_device *dev, int net_id);
	129
	130	/* Extract dsfield from inner protocol */
	131	static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
	132	const struct sk_buff *skb)
	133	{
	134	if (skb->protocol == htons(ETH_P_IP))
	135	return iph->tos;
	136	else if (skb->protocol == htons(ETH_P_IPV6))
	137	return ipv6_get_dsfield((const struct ipv6hdr *)iph);
	138	else
	139	return 0;
	140	}
	141
	142	/* Propogate ECN bits out */
	143	static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
	144	const struct sk_buff *skb)
	145	{
	146	u8 inner = ip_tunnel_get_dsfield(iph, skb);
	147
	148	return INET_ECN_encapsulate(tos, inner);
	149	}
	150
3d7b46cd	151	int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
8b7ed2d9	152	int iptunnel_xmit(struct rtable rt, struct sk_buff skb,
0e6fbc5b	153	__be32 src, __be32 dst, __u8 proto,
963a88b3	154	__u8 tos, __u8 ttl, __be16 df, bool xnet);
0e6fbc5b	155
2d26f0a3 ED	156	struct sk_buff iptunnel_handle_offloads(struct sk_buff skb, bool gre_csum,
	157	int gso_type_mask);
	158
0e6fbc5b PS	159	static inline void iptunnel_xmit_stats(int err,
	160	struct net_device_stats *err_stats,
	161	struct pcpu_tstats __percpu *stats)
c5441932	162	{
0e6fbc5b PS	163	if (err > 0) {
0e6fbc5b PS	164	struct pcpu_tstats *tstats = this_cpu_ptr(stats);
c5441932	165
c5441932	166	u64_stats_update_begin(&tstats->syncp);
0e6fbc5b	167	tstats->tx_bytes += err;
c5441932 PS	168	tstats->tx_packets++;
c5441932 PS	169	u64_stats_update_end(&tstats->syncp);
0e6fbc5b PS	170	} else if (err < 0) {
	171	err_stats->tx_errors++;
	172	err_stats->tx_aborted_errors++;
c5441932	173	} else {
0e6fbc5b	174	err_stats->tx_dropped++;
c5441932 PS	175	}
c5441932 PS	176	}
5243b6ac JG	177
	178	#endif /* CONFIG_INET */
	179
c5441932	180	#endif /* __NET_IP_TUNNELS_H */