[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/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;

	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 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)

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   10
#define IP_TNL_HASH_SIZE   (1 << IP_TNL_HASH_BITS)

struct ip_tunnel_net {
	struct hlist_head *tunnels;
	struct net_device *fb_tunnel_dev;
};

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 __net_init ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
				  struct rtnl_link_ops *ops, char *devname);

void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn);

void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
		    const struct iphdr *tnl_params);
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);
}

static inline void tunnel_ip_select_ident(struct sk_buff *skb,
					  const struct iphdr  *old_iph,
					  struct dst_entry *dst)
{
	struct iphdr *iph = ip_hdr(skb);

	/* Use inner packet iph-id if possible. */
	if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
		iph->id	= old_iph->id;
	else
		__ip_select_ident(iph, dst,
				  (skb_shinfo(skb)->gso_segs ?: 1) - 1);
}

static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
{
	int err;
	int pkt_len = skb->len - skb_transport_offset(skb);
	struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats);

	nf_reset(skb);

	err = ip_local_out(skb);
	if (likely(net_xmit_eval(err) == 0)) {
		u64_stats_update_begin(&tstats->syncp);
		tstats->tx_bytes += pkt_len;
		tstats->tx_packets++;
		u64_stats_update_end(&tstats->syncp);
	} else {
		dev->stats.tx_errors++;
		dev->stats.tx_aborted_errors++;
	}
}
#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;
	45
	46	int err_count; /* Number of arrived ICMP errors */
	47	unsigned long err_time; /* Time when the last ICMP error
	48	* arrived */
	49
	50	/* These four fields used only by GRE */
	51	__u32 i_seqno; /* The last seen seqno */
	52	__u32 o_seqno; /* The last output seqno */
	53	int hlen; /* Precalculated header length */
	54	int mlink;
	55
	56	struct ip_tunnel_parm parms;
	57
	58	/* for SIT */
	59	#ifdef CONFIG_IPV6_SIT_6RD
	60	struct ip_tunnel_6rd_parm ip6rd;
	61	#endif
	62	struct ip_tunnel_prl_entry __rcu prl; / potential router list */
	63	unsigned int prl_count; /* # of entries in PRL */
	64	int ip_tnl_net_id;
65	struct gro_cells gro_cells;
66	};
67
68	#define TUNNEL_CSUM __cpu_to_be16(0x01)
69	#define TUNNEL_ROUTING __cpu_to_be16(0x02)
70	#define TUNNEL_KEY __cpu_to_be16(0x04)
71	#define TUNNEL_SEQ __cpu_to_be16(0x08)
72	#define TUNNEL_STRICT __cpu_to_be16(0x10)
73	#define TUNNEL_REC __cpu_to_be16(0x20)
74	#define TUNNEL_VERSION __cpu_to_be16(0x40)
75	#define TUNNEL_NO_KEY __cpu_to_be16(0x80)
76
77	struct tnl_ptk_info {
78	__be16 flags;
79	__be16 proto;
80	__be32 key;
81	__be32 seq;
82	};
83
84	#define PACKET_RCVD 0
85	#define PACKET_REJECT 1
86
87	#define IP_TNL_HASH_BITS 10
88	#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
89
90	struct ip_tunnel_net {
91	struct hlist_head *tunnels;
92	struct net_device *fb_tunnel_dev;
93	};
94
95	int ip_tunnel_init(struct net_device *dev);
96	void ip_tunnel_uninit(struct net_device *dev);
97	void ip_tunnel_dellink(struct net_device dev, struct list_head head);
98	int __net_init ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
99	struct rtnl_link_ops ops, char devname);
100
101	void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn);
102
103	void ip_tunnel_xmit(struct sk_buff skb, struct net_device dev,
104	const struct iphdr *tnl_params);
105	int ip_tunnel_ioctl(struct net_device dev, struct ip_tunnel_parm p, int cmd);
106	int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
107
108	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
109	struct rtnl_link_stats64 *tot);
110	struct ip_tunnel ip_tunnel_lookup(struct ip_tunnel_net itn,
111	int link, __be16 flags,
112	__be32 remote, __be32 local,
113	__be32 key);
114
115	int ip_tunnel_rcv(struct ip_tunnel tunnel, struct sk_buff skb,
116	const struct tnl_ptk_info *tpi, bool log_ecn_error);
117	int ip_tunnel_changelink(struct net_device dev, struct nlattr tb[],
118	struct ip_tunnel_parm *p);
119	int ip_tunnel_newlink(struct net_device dev, struct nlattr tb[],
120	struct ip_tunnel_parm *p);
121	void ip_tunnel_setup(struct net_device *dev, int net_id);
122
123	/* Extract dsfield from inner protocol */
124	static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
125	const struct sk_buff *skb)
126	{
127	if (skb->protocol == htons(ETH_P_IP))
128	return iph->tos;
129	else if (skb->protocol == htons(ETH_P_IPV6))
130	return ipv6_get_dsfield((const struct ipv6hdr *)iph);
131	else
132	return 0;
133	}
134
135	/* Propogate ECN bits out */
136	static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
137	const struct sk_buff *skb)
138	{
139	u8 inner = ip_tunnel_get_dsfield(iph, skb);
140
141	return INET_ECN_encapsulate(tos, inner);
142	}
143
144	static inline void tunnel_ip_select_ident(struct sk_buff *skb,
145	const struct iphdr *old_iph,
146	struct dst_entry *dst)
147	{
148	struct iphdr *iph = ip_hdr(skb);
149
150	/* Use inner packet iph-id if possible. */
151	if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
152	iph->id = old_iph->id;
153	else
154	__ip_select_ident(iph, dst,
155	(skb_shinfo(skb)->gso_segs ?: 1) - 1);
156	}
157
158	static inline void iptunnel_xmit(struct sk_buff skb, struct net_device dev)
159	{
160	int err;
161	int pkt_len = skb->len - skb_transport_offset(skb);
162	struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats);
163
164	nf_reset(skb);
165
166	err = ip_local_out(skb);
167	if (likely(net_xmit_eval(err) == 0)) {
168	u64_stats_update_begin(&tstats->syncp);
169	tstats->tx_bytes += pkt_len;
170	tstats->tx_packets++;
171	u64_stats_update_end(&tstats->syncp);
172	} else {
173	dev->stats.tx_errors++;
174	dev->stats.tx_aborted_errors++;
175	}
176	}
177	#endif /* __NET_IP_TUNNELS_H */