Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / include / net / lwtunnel.h
blobd747ef975cd80a15105288b2c2235b41b71be7b6
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_LWTUNNEL_H
3 #define __NET_LWTUNNEL_H 1
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>
11 #define LWTUNNEL_HASH_BITS 7
12 #define LWTUNNEL_HASH_SIZE (1 << LWTUNNEL_HASH_BITS)
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)
19 enum {
20 LWTUNNEL_XMIT_DONE,
21 LWTUNNEL_XMIT_CONTINUE,
25 struct 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];
36 struct 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);
50 struct module *owner;
53 #ifdef CONFIG_LWTUNNEL
54 void lwtstate_free(struct lwtunnel_state *lws);
56 static inline struct lwtunnel_state *
57 lwtstate_get(struct lwtunnel_state *lws)
59 if (lws)
60 atomic_inc(&lws->refcnt);
62 return lws;
65 static inline void lwtstate_put(struct lwtunnel_state *lws)
67 if (!lws)
68 return;
70 if (atomic_dec_and_test(&lws->refcnt))
71 lwtstate_free(lws);
74 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
76 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
77 return true;
79 return false;
82 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
84 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
85 return true;
87 return false;
90 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
92 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT))
93 return true;
95 return false;
98 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
99 unsigned int mtu)
101 if ((lwtunnel_xmit_redirect(lwtstate) ||
102 lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu)
103 return lwtstate->headroom;
105 return 0;
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);
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);
116 int 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);
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);
126 int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
127 int lwtunnel_input(struct sk_buff *skb);
128 int lwtunnel_xmit(struct sk_buff *skb);
130 #else
132 static inline void lwtstate_free(struct lwtunnel_state *lws)
136 static inline struct lwtunnel_state *
137 lwtstate_get(struct lwtunnel_state *lws)
139 return lws;
142 static inline void lwtstate_put(struct lwtunnel_state *lws)
146 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
148 return false;
151 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
153 return false;
156 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
158 return false;
161 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
162 unsigned int mtu)
164 return 0;
167 static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
168 unsigned int num)
170 return -EOPNOTSUPP;
174 static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
175 unsigned int num)
177 return -EOPNOTSUPP;
180 static inline int lwtunnel_valid_encap_type(u16 encap_type,
181 struct netlink_ext_ack *extack)
183 NL_SET_ERR_MSG(extack, "CONFIG_LWTUNNEL is not enabled in this kernel");
184 return -EOPNOTSUPP;
186 static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
187 struct netlink_ext_ack *extack)
189 /* return 0 since we are not walking attr looking for
190 * RTA_ENCAP_TYPE attribute on nexthops.
192 return 0;
195 static inline int lwtunnel_build_state(u16 encap_type,
196 struct nlattr *encap,
197 unsigned int family, const void *cfg,
198 struct lwtunnel_state **lws,
199 struct netlink_ext_ack *extack)
201 return -EOPNOTSUPP;
204 static inline int lwtunnel_fill_encap(struct sk_buff *skb,
205 struct lwtunnel_state *lwtstate)
207 return 0;
210 static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
212 return 0;
215 static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
217 return NULL;
220 static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
221 struct lwtunnel_state *b)
223 return 0;
226 static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
228 return -EOPNOTSUPP;
231 static inline int lwtunnel_input(struct sk_buff *skb)
233 return -EOPNOTSUPP;
236 static inline int lwtunnel_xmit(struct sk_buff *skb)
238 return -EOPNOTSUPP;
241 #endif /* CONFIG_LWTUNNEL */
243 #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
245 #endif /* __NET_LWTUNNEL_H */