[linux-block.git] / include / net / lwtunnel.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_LWTUNNEL_H
#define __NET_LWTUNNEL_H 1

#include <linux/lwtunnel.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <net/route.h>

#define LWTUNNEL_HASH_BITS   7
#define LWTUNNEL_HASH_SIZE   (1 << LWTUNNEL_HASH_BITS)

/* lw tunnel state flags */
#define LWTUNNEL_STATE_OUTPUT_REDIRECT	BIT(0)
#define LWTUNNEL_STATE_INPUT_REDIRECT	BIT(1)
#define LWTUNNEL_STATE_XMIT_REDIRECT	BIT(2)

enum {
	LWTUNNEL_XMIT_DONE,
	LWTUNNEL_XMIT_CONTINUE,
};


struct lwtunnel_state {
	__u16		type;
	__u16		flags;
	__u16		headroom;
	atomic_t	refcnt;
	int		(*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
	int		(*orig_input)(struct sk_buff *);
	struct		rcu_head rcu;
	__u8            data[0];
};

struct lwtunnel_encap_ops {
	int (*build_state)(struct nlattr *encap,
			   unsigned int family, const void *cfg,
			   struct lwtunnel_state **ts,
			   struct netlink_ext_ack *extack);
	void (*destroy_state)(struct lwtunnel_state *lws);
	int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
	int (*input)(struct sk_buff *skb);
	int (*fill_encap)(struct sk_buff *skb,
			  struct lwtunnel_state *lwtstate);
	int (*get_encap_size)(struct lwtunnel_state *lwtstate);
	int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
	int (*xmit)(struct sk_buff *skb);

	struct module *owner;
};

#ifdef CONFIG_LWTUNNEL
void lwtstate_free(struct lwtunnel_state *lws);

static inline struct lwtunnel_state *
lwtstate_get(struct lwtunnel_state *lws)
{
	if (lws)
		atomic_inc(&lws->refcnt);

	return lws;
}

static inline void lwtstate_put(struct lwtunnel_state *lws)
{
	if (!lws)
		return;

	if (atomic_dec_and_test(&lws->refcnt))
		lwtstate_free(lws);
}

static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
{
	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
		return true;

	return false;
}

static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
{
	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
		return true;

	return false;
}

static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
{
	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT))
		return true;

	return false;
}

static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
					     unsigned int mtu)
{
	if ((lwtunnel_xmit_redirect(lwtstate) ||
	     lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu)
		return lwtstate->headroom;

	return 0;
}

int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
			   unsigned int num);
int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
			   unsigned int num);
int lwtunnel_valid_encap_type(u16 encap_type,
			      struct netlink_ext_ack *extack);
int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
				   struct netlink_ext_ack *extack);
int lwtunnel_build_state(u16 encap_type,
			 struct nlattr *encap,
			 unsigned int family, const void *cfg,
			 struct lwtunnel_state **lws,
			 struct netlink_ext_ack *extack);
int lwtunnel_fill_encap(struct sk_buff *skb,
			struct lwtunnel_state *lwtstate);
int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int lwtunnel_input(struct sk_buff *skb);
int lwtunnel_xmit(struct sk_buff *skb);

static inline void lwtunnel_set_redirect(struct dst_entry *dst)
{
	if (lwtunnel_output_redirect(dst->lwtstate)) {
		dst->lwtstate->orig_output = dst->output;
		dst->output = lwtunnel_output;
	}
	if (lwtunnel_input_redirect(dst->lwtstate)) {
		dst->lwtstate->orig_input = dst->input;
		dst->input = lwtunnel_input;
	}
}
#else

static inline void lwtstate_free(struct lwtunnel_state *lws)
{
}

static inline struct lwtunnel_state *
lwtstate_get(struct lwtunnel_state *lws)
{
	return lws;
}

static inline void lwtstate_put(struct lwtunnel_state *lws)
{
}

static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
{
	return false;
}

static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
{
	return false;
}

static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
{
	return false;
}

static inline void lwtunnel_set_redirect(struct dst_entry *dst)
{
}

static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
					     unsigned int mtu)
{
	return 0;
}

static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
					 unsigned int num)
{
	return -EOPNOTSUPP;

}

static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
					 unsigned int num)
{
	return -EOPNOTSUPP;
}

static inline int lwtunnel_valid_encap_type(u16 encap_type,
					    struct netlink_ext_ack *extack)
{
	NL_SET_ERR_MSG(extack, "CONFIG_LWTUNNEL is not enabled in this kernel");
	return -EOPNOTSUPP;
}
static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
						 struct netlink_ext_ack *extack)
{
	/* return 0 since we are not walking attr looking for
	 * RTA_ENCAP_TYPE attribute on nexthops.
	 */
	return 0;
}

static inline int lwtunnel_build_state(u16 encap_type,
				       struct nlattr *encap,
				       unsigned int family, const void *cfg,
				       struct lwtunnel_state **lws,
				       struct netlink_ext_ack *extack)
{
	return -EOPNOTSUPP;
}

static inline int lwtunnel_fill_encap(struct sk_buff *skb,
				      struct lwtunnel_state *lwtstate)
{
	return 0;
}

static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
{
	return 0;
}

static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
{
	return NULL;
}

static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
				     struct lwtunnel_state *b)
{
	return 0;
}

static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	return -EOPNOTSUPP;
}

static inline int lwtunnel_input(struct sk_buff *skb)
{
	return -EOPNOTSUPP;
}

static inline int lwtunnel_xmit(struct sk_buff *skb)
{
	return -EOPNOTSUPP;
}

#endif /* CONFIG_LWTUNNEL */

#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))

#endif /* __NET_LWTUNNEL_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
499a2425 RP	2	#ifndef __NET_LWTUNNEL_H
	3	#define __NET_LWTUNNEL_H 1
	4
	5	#include <linux/lwtunnel.h>
	6	#include <linux/netdevice.h>
	7	#include <linux/skbuff.h>
	8	#include <linux/types.h>
	9	#include <net/route.h>
	10
	11	#define LWTUNNEL_HASH_BITS 7
	12	#define LWTUNNEL_HASH_SIZE (1 << LWTUNNEL_HASH_BITS)
	13
	14	/* lw tunnel state flags */
25368623 TH	15	#define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0)
25368623 TH	16	#define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1)
14972cbd RP	17	#define LWTUNNEL_STATE_XMIT_REDIRECT BIT(2)
	18
	19	enum {
	20	LWTUNNEL_XMIT_DONE,
	21	LWTUNNEL_XMIT_CONTINUE,
	22	};
	23
499a2425 RP	24
	25	struct lwtunnel_state {
	26	__u16 type;
	27	__u16 flags;
f76a9db3	28	__u16 headroom;
499a2425	29	atomic_t refcnt;
ede2059d	30	int (orig_output)(struct net net, struct sock sk, struct sk_buff skb);
25368623	31	int (orig_input)(struct sk_buff );
1104d9ba	32	struct rcu_head rcu;
499a2425 RP	33	__u8 data[0];
	34	};
	35
	36	struct lwtunnel_encap_ops {
30357d7d	37	int (build_state)(struct nlattr encap,
127eb7cd	38	unsigned int family, const void *cfg,
9ae28727 DA	39	struct lwtunnel_state **ts,
9ae28727 DA	40	struct netlink_ext_ack *extack);
1104d9ba	41	void (destroy_state)(struct lwtunnel_state lws);
ede2059d	42	int (output)(struct net net, struct sock sk, struct sk_buff skb);
25368623	43	int (input)(struct sk_buff skb);
499a2425 RP	44	int (fill_encap)(struct sk_buff skb,
	45	struct lwtunnel_state *lwtstate);
	46	int (get_encap_size)(struct lwtunnel_state lwtstate);
	47	int (cmp_encap)(struct lwtunnel_state a, struct lwtunnel_state *b);
14972cbd	48	int (xmit)(struct sk_buff skb);
88ff7334 RS	49
88ff7334 RS	50	struct module *owner;
499a2425 RP	51	};
499a2425 RP	52
499a2425	53	#ifdef CONFIG_LWTUNNEL
1104d9ba	54	void lwtstate_free(struct lwtunnel_state *lws);
df383e62	55
5a6228a0 ND	56	static inline struct lwtunnel_state *
5a6228a0 ND	57	lwtstate_get(struct lwtunnel_state *lws)
499a2425	58	{
5a6228a0 ND	59	if (lws)
	60	atomic_inc(&lws->refcnt);
	61
	62	return lws;
499a2425 RP	63	}
499a2425 RP	64
5a6228a0	65	static inline void lwtstate_put(struct lwtunnel_state *lws)
499a2425 RP	66	{
	67	if (!lws)
	68	return;
	69
	70	if (atomic_dec_and_test(&lws->refcnt))
df383e62	71	lwtstate_free(lws);
499a2425 RP	72	}
	73
	74	static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
	75	{
	76	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
	77	return true;
	78
	79	return false;
	80	}
	81
25368623 TH	82	static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
	83	{
	84	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
	85	return true;
	86
	87	return false;
	88	}
14972cbd RP	89
	90	static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
	91	{
	92	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT))
	93	return true;
	94
	95	return false;
	96	}
	97
	98	static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
	99	unsigned int mtu)
	100	{
a23a8f5b DL	101	if ((lwtunnel_xmit_redirect(lwtstate) \|\|
a23a8f5b DL	102	lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu)
14972cbd RP	103	return lwtstate->headroom;
	104
	105	return 0;
	106	}
	107
499a2425 RP	108	int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
	109	unsigned int num);
	110	int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
	111	unsigned int num);
c255bd68 DA	112	int lwtunnel_valid_encap_type(u16 encap_type,
	113	struct netlink_ext_ack *extack);
	114	int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
	115	struct netlink_ext_ack *extack);
30357d7d	116	int lwtunnel_build_state(u16 encap_type,
499a2425	117	struct nlattr *encap,
127eb7cd	118	unsigned int family, const void *cfg,
9ae28727 DA	119	struct lwtunnel_state **lws,
9ae28727 DA	120	struct netlink_ext_ack *extack);
499a2425 RP	121	int lwtunnel_fill_encap(struct sk_buff *skb,
	122	struct lwtunnel_state *lwtstate);
	123	int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
	124	struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
	125	int lwtunnel_cmp_encap(struct lwtunnel_state a, struct lwtunnel_state b);
ede2059d	126	int lwtunnel_output(struct net net, struct sock sk, struct sk_buff *skb);
25368623	127	int lwtunnel_input(struct sk_buff *skb);
14972cbd	128	int lwtunnel_xmit(struct sk_buff *skb);
499a2425	129
9942895b DA	130	static inline void lwtunnel_set_redirect(struct dst_entry *dst)
	131	{
	132	if (lwtunnel_output_redirect(dst->lwtstate)) {
	133	dst->lwtstate->orig_output = dst->output;
	134	dst->output = lwtunnel_output;
	135	}
	136	if (lwtunnel_input_redirect(dst->lwtstate)) {
	137	dst->lwtstate->orig_input = dst->input;
	138	dst->input = lwtunnel_input;
	139	}
	140	}
499a2425 RP	141	#else
499a2425 RP	142
824e7383 YX	143	static inline void lwtstate_free(struct lwtunnel_state *lws)
	144	{
	145	}
	146
5a6228a0 ND	147	static inline struct lwtunnel_state *
5a6228a0 ND	148	lwtstate_get(struct lwtunnel_state *lws)
499a2425	149	{
5a6228a0	150	return lws;
499a2425 RP	151	}
499a2425 RP	152
5a6228a0	153	static inline void lwtstate_put(struct lwtunnel_state *lws)
499a2425 RP	154	{
	155	}
	156
	157	static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
	158	{
	159	return false;
	160	}
	161
25368623 TH	162	static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
	163	{
	164	return false;
	165	}
	166
14972cbd RP	167	static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
	168	{
	169	return false;
	170	}
	171
9942895b DA	172	static inline void lwtunnel_set_redirect(struct dst_entry *dst)
	173	{
	174	}
	175
14972cbd RP	176	static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
	177	unsigned int mtu)
	178	{
	179	return 0;
	180	}
	181
499a2425 RP	182	static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
	183	unsigned int num)
	184	{
	185	return -EOPNOTSUPP;
	186
	187	}
	188
	189	static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
	190	unsigned int num)
	191	{
	192	return -EOPNOTSUPP;
	193	}
	194
c255bd68 DA	195	static inline int lwtunnel_valid_encap_type(u16 encap_type,
c255bd68 DA	196	struct netlink_ext_ack *extack)
9ed59592	197	{
c255bd68	198	NL_SET_ERR_MSG(extack, "CONFIG_LWTUNNEL is not enabled in this kernel");
9ed59592 DA	199	return -EOPNOTSUPP;
9ed59592 DA	200	}
c255bd68 DA	201	static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
c255bd68 DA	202	struct netlink_ext_ack *extack)
9ed59592	203	{
2bd137de DA	204	/* return 0 since we are not walking attr looking for
	205	* RTA_ENCAP_TYPE attribute on nexthops.
	206	*/
	207	return 0;
9ed59592 DA	208	}
9ed59592 DA	209
30357d7d	210	static inline int lwtunnel_build_state(u16 encap_type,
499a2425	211	struct nlattr *encap,
127eb7cd	212	unsigned int family, const void *cfg,
9ae28727 DA	213	struct lwtunnel_state **lws,
9ae28727 DA	214	struct netlink_ext_ack *extack)
499a2425 RP	215	{
	216	return -EOPNOTSUPP;
	217	}
	218
	219	static inline int lwtunnel_fill_encap(struct sk_buff *skb,
	220	struct lwtunnel_state *lwtstate)
	221	{
	222	return 0;
	223	}
	224
	225	static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
	226	{
	227	return 0;
	228	}
	229
	230	static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
	231	{
	232	return NULL;
	233	}
	234
	235	static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
	236	struct lwtunnel_state *b)
	237	{
	238	return 0;
	239	}
	240
ede2059d	241	static inline int lwtunnel_output(struct net net, struct sock sk, struct sk_buff *skb)
ffce4196 RP	242	{
	243	return -EOPNOTSUPP;
	244	}
	245
25368623 TH	246	static inline int lwtunnel_input(struct sk_buff *skb)
	247	{
	248	return -EOPNOTSUPP;
	249	}
	250
14972cbd RP	251	static inline int lwtunnel_xmit(struct sk_buff *skb)
	252	{
	253	return -EOPNOTSUPP;
	254	}
	255
745041e2 RS	256	#endif /* CONFIG_LWTUNNEL */
	257
	258	#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
499a2425 RP	259
499a2425 RP	260	#endif /* __NET_LWTUNNEL_H */