net/dccp/ccid.h

   1 #ifndef _CCID_H
   2 #define _CCID_H
   3 /*
   4  *  net/dccp/ccid.h
   5  *
   6  *  An implementation of the DCCP protocol
   7  *  Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   8  *
   9  *  CCID infrastructure
  10  *
  11  *      This program is free software; you can redistribute it and/or modify it
  12  *      under the terms of the GNU General Public License version 2 as
  13  *      published by the Free Software Foundation.
  14  */
  15
  16 #include <net/sock.h>
  17 #include <linux/compiler.h>
  18 #include <linux/dccp.h>
  19 #include <linux/list.h>
  20 #include <linux/module.h>
  21
  22 #define CCID_MAX 255
  23
  24 struct tcp_info;
  25
  26 struct ccid_operations {
  27         unsigned char   ccid_id;
  28         const char      *ccid_name;
  29         struct module   *ccid_owner;
  30         struct kmem_cache       *ccid_hc_rx_slab;
  31         __u32           ccid_hc_rx_obj_size;
  32         struct kmem_cache       *ccid_hc_tx_slab;
  33         __u32           ccid_hc_tx_obj_size;
  34         int             (*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk);
  35         int             (*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk);
  36         void            (*ccid_hc_rx_exit)(struct sock *sk);
  37         void            (*ccid_hc_tx_exit)(struct sock *sk);
  38         void            (*ccid_hc_rx_packet_recv)(struct sock *sk,
  39                                                   struct sk_buff *skb);
  40         int             (*ccid_hc_rx_parse_options)(struct sock *sk,
  41                                                     unsigned char option,
  42                                                     unsigned char len, u16 idx,
  43                                                     unsigned char* value);
  44         int             (*ccid_hc_rx_insert_options)(struct sock *sk,
  45                                                      struct sk_buff *skb);
  46         void            (*ccid_hc_tx_packet_recv)(struct sock *sk,
  47                                                   struct sk_buff *skb);
  48         int             (*ccid_hc_tx_parse_options)(struct sock *sk,
  49                                                     unsigned char option,
  50                                                     unsigned char len, u16 idx,
  51                                                     unsigned char* value);
  52         int             (*ccid_hc_tx_send_packet)(struct sock *sk,
  53                                                   struct sk_buff *skb);
  54         void            (*ccid_hc_tx_packet_sent)(struct sock *sk,
  55                                                   int more, unsigned int len);
  56         void            (*ccid_hc_rx_get_info)(struct sock *sk,
  57                                                struct tcp_info *info);
  58         void            (*ccid_hc_tx_get_info)(struct sock *sk,
  59                                                struct tcp_info *info);
  60         int             (*ccid_hc_rx_getsockopt)(struct sock *sk,
  61                                                  const int optname, int len,
  62                                                  u32 __user *optval,
  63                                                  int __user *optlen);
  64         int             (*ccid_hc_tx_getsockopt)(struct sock *sk,
  65                                                  const int optname, int len,
  66                                                  u32 __user *optval,
  67                                                  int __user *optlen);
  68 };
  69
  70 extern int ccid_register(struct ccid_operations *ccid_ops);
  71 extern int ccid_unregister(struct ccid_operations *ccid_ops);
  72
  73 struct ccid {
  74         struct ccid_operations *ccid_ops;
  75         char                   ccid_priv[0];
  76 };
  77
  78 static inline void *ccid_priv(const struct ccid *ccid)
  79 {
  80         return (void *)ccid->ccid_priv;
  81 }
  82
  83 extern struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx,
  84                              gfp_t gfp);
  85
  86 extern struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk,
  87                                    gfp_t gfp);
  88 extern struct ccid *ccid_hc_tx_new(unsigned char id, struct sock *sk,
  89                                    gfp_t gfp);
  90
  91 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
  92 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
  93
  94 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
  95                                          struct sk_buff *skb)
  96 {
  97         int rc = 0;
  98         if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
  99                 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
 100         return rc;
 101 }
 102
 103 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
 104                                           int more, unsigned int len)
 105 {
 106         if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
 107                 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
 108 }
 109
 110 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
 111                                           struct sk_buff *skb)
 112 {
 113         if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
 114                 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
 115 }
 116
 117 static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
 118                                           struct sk_buff *skb)
 119 {
 120         if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
 121                 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
 122 }
 123
 124 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
 125                                            unsigned char option,
 126                                            unsigned char len, u16 idx,
 127                                            unsigned char* value)
 128 {
 129         int rc = 0;
 130         if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
 131                 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
 132                                                     value);
 133         return rc;
 134 }
 135
 136 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
 137                                            unsigned char option,
 138                                            unsigned char len, u16 idx,
 139                                            unsigned char* value)
 140 {
 141         int rc = 0;
 142         if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
 143                 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
 144         return rc;
 145 }
 146
 147 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
 148                                             struct sk_buff *skb)
 149 {
 150         if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
 151                 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
 152         return 0;
 153 }
 154
 155 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
 156                                        struct tcp_info *info)
 157 {
 158         if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
 159                 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
 160 }
 161
 162 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
 163                                        struct tcp_info *info)
 164 {
 165         if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
 166                 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
 167 }
 168
 169 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
 170                                         const int optname, int len,
 171                                         u32 __user *optval, int __user *optlen)
 172 {
 173         int rc = -ENOPROTOOPT;
 174         if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
 175                 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
 176                                                  optval, optlen);
 177         return rc;
 178 }
 179
 180 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
 181                                         const int optname, int len,
 182                                         u32 __user *optval, int __user *optlen)
 183 {
 184         int rc = -ENOPROTOOPT;
 185         if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
 186                 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,
 187                                                  optval, optlen);
 188         return rc;
 189 }
 190 #endif /* _CCID_H */