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