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 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
  27 struct 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
  40 static inline void lwtstate_free(struct lwtunnel_state *lws)
  41 {
  42         kfree(lws);
  43 }
  44
  45 static inline struct lwtunnel_state *
  46 lwtstate_get(struct lwtunnel_state *lws)
  47 {
  48         if (lws)
  49                 atomic_inc(&lws->refcnt);
  50
  51         return lws;
  52 }
  53
  54 static 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
  63 static 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
  71 static 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 }
  78 int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
  79                            unsigned int num);
  80 int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
  81                            unsigned int num);
  82 int 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);
  86 int lwtunnel_fill_encap(struct sk_buff *skb,
  87                         struct lwtunnel_state *lwtstate);
  88 int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
  89 struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
  90 int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
  91 int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
  92 int lwtunnel_input(struct sk_buff *skb);
  93
  94 #else
  95
  96 static inline void lwtstate_free(struct lwtunnel_state *lws)
  97 {
  98 }
  99
 100 static inline struct lwtunnel_state *
 101 lwtstate_get(struct lwtunnel_state *lws)
 102 {
 103         return lws;
 104 }
 105
 106 static inline void lwtstate_put(struct lwtunnel_state *lws)
 107 {
 108 }
 109
 110 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
 111 {
 112         return false;
 113 }
 114
 115 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
 116 {
 117         return false;
 118 }
 119
 120 static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
 121                                          unsigned int num)
 122 {
 123         return -EOPNOTSUPP;
 124
 125 }
 126
 127 static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
 128                                          unsigned int num)
 129 {
 130         return -EOPNOTSUPP;
 131 }
 132
 133 static 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
 141 static inline int lwtunnel_fill_encap(struct sk_buff *skb,
 142                                       struct lwtunnel_state *lwtstate)
 143 {
 144         return 0;
 145 }
 146
 147 static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
 148 {
 149         return 0;
 150 }
 151
 152 static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
 153 {
 154         return NULL;
 155 }
 156
 157 static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
 158                                      struct lwtunnel_state *b)
 159 {
 160         return 0;
 161 }
 162
 163 static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 164 {
 165         return -EOPNOTSUPP;
 166 }
 167
 168 static 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 */