include/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
  17 struct lwtunnel_state {
  18         __u16           type;
  19         __u16           flags;
  20         atomic_t        refcnt;
  21         int             (*orig_output)(struct sock *sk, struct sk_buff *skb);
  22         int             (*orig_input)(struct sk_buff *);
  23         int             len;
  24         __u8            data[0];
  25 };
  26
  27 struct lwtunnel_encap_ops {
  28         int (*build_state)(struct net_device *dev, struct nlattr *encap,
  29                            struct lwtunnel_state **ts);
  30         int (*output)(struct sock *sk, struct sk_buff *skb);
  31         int (*input)(struct sk_buff *skb);
  32         int (*fill_encap)(struct sk_buff *skb,
  33                           struct lwtunnel_state *lwtstate);
  34         int (*get_encap_size)(struct lwtunnel_state *lwtstate);
  35         int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
  36 };
  37
  38 #ifdef CONFIG_LWTUNNEL
  39 static inline void lwtstate_free(struct lwtunnel_state *lws)
  40 {
  41         kfree(lws);
  42 }
  43
  44 static inline struct lwtunnel_state *
  45 lwtstate_get(struct lwtunnel_state *lws)
  46 {
  47         if (lws)
  48                 atomic_inc(&lws->refcnt);
  49
  50         return lws;
  51 }
  52
  53 static inline void lwtstate_put(struct lwtunnel_state *lws)
  54 {
  55         if (!lws)
  56                 return;
  57
  58         if (atomic_dec_and_test(&lws->refcnt))
  59                 lwtstate_free(lws);
  60 }
  61
  62 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
  63 {
  64         if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
  65                 return true;
  66
  67         return false;
  68 }
  69
  70 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
  71 {
  72         if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
  73                 return true;
  74
  75         return false;
  76 }
  77 int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
  78                            unsigned int num);
  79 int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
  80                            unsigned int num);
  81 int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
  82                          struct nlattr *encap,
  83                          struct lwtunnel_state **lws);
  84 int lwtunnel_fill_encap(struct sk_buff *skb,
  85                         struct lwtunnel_state *lwtstate);
  86 int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
  87 struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
  88 int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
  89 int lwtunnel_output(struct sock *sk, struct sk_buff *skb);
  90 int lwtunnel_input(struct sk_buff *skb);
  91
  92 #else
  93
  94 static inline void lwtstate_free(struct lwtunnel_state *lws)
  95 {
  96 }
  97
  98 static inline struct lwtunnel_state *
  99 lwtstate_get(struct lwtunnel_state *lws)
 100 {
 101         return lws;
 102 }
 103
 104 static inline void lwtstate_put(struct lwtunnel_state *lws)
 105 {
 106 }
 107
 108 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
 109 {
 110         return false;
 111 }
 112
 113 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
 114 {
 115         return false;
 116 }
 117
 118 static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
 119                                          unsigned int num)
 120 {
 121         return -EOPNOTSUPP;
 122
 123 }
 124
 125 static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
 126                                          unsigned int num)
 127 {
 128         return -EOPNOTSUPP;
 129 }
 130
 131 static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
 132                                        struct nlattr *encap,
 133                                        struct lwtunnel_state **lws)
 134 {
 135         return -EOPNOTSUPP;
 136 }
 137
 138 static inline int lwtunnel_fill_encap(struct sk_buff *skb,
 139                                       struct lwtunnel_state *lwtstate)
 140 {
 141         return 0;
 142 }
 143
 144 static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
 145 {
 146         return 0;
 147 }
 148
 149 static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
 150 {
 151         return NULL;
 152 }
 153
 154 static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
 155                                      struct lwtunnel_state *b)
 156 {
 157         return 0;
 158 }
 159
 160 static inline int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
 161 {
 162         return -EOPNOTSUPP;
 163 }
 164
 165 static inline int lwtunnel_input(struct sk_buff *skb)
 166 {
 167         return -EOPNOTSUPP;
 168 }
 169
 170 #endif
 171
 172 #endif /* __NET_LWTUNNEL_H */