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 /**
  27  *  struct ccid_operations  -  Interface to Congestion-Control Infrastructure
  28  *
  29  *  @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.)
  30  *  @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled)
  31  *  @ccid_name: alphabetical identifier string for @ccid_id
  32  *  @ccid_hc_{r,t}x_slab: memory pool for the receiver/sender half-connection
  33  *  @ccid_hc_{r,t}x_obj_size: size of the receiver/sender half-connection socket
  34  *
  35  *  @ccid_hc_{r,t}x_init: CCID-specific initialisation routine (before startup)
  36  *  @ccid_hc_{r,t}x_exit: CCID-specific cleanup routine (before destruction)
  37  *  @ccid_hc_rx_packet_recv: implements the HC-receiver side
  38  *  @ccid_hc_{r,t}x_parse_options: parsing routine for CCID/HC-specific options
  39  *  @ccid_hc_{r,t}x_insert_options: insert routine for CCID/HC-specific options
  40  *  @ccid_hc_tx_packet_recv: implements feedback processing for the HC-sender
  41  *  @ccid_hc_tx_send_packet: implements the sending part of the HC-sender
  42  *  @ccid_hc_tx_packet_sent: does accounting for packets in flight by HC-sender
  43  *  @ccid_hc_{r,t}x_get_info: INET_DIAG information for HC-receiver/sender
  44  *  @ccid_hc_{r,t}x_getsockopt: socket options specific to HC-receiver/sender
  45  */
  46 struct ccid_operations {
  47         unsigned char           ccid_id;
  48         __u32                   ccid_ccmps;
  49         const char              *ccid_name;
  50         struct kmem_cache       *ccid_hc_rx_slab,
  51                                 *ccid_hc_tx_slab;
  52         __u32                   ccid_hc_rx_obj_size,
  53                                 ccid_hc_tx_obj_size;
  54         /* Interface Routines */
  55         int             (*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk);
  56         int             (*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk);
  57         void            (*ccid_hc_rx_exit)(struct sock *sk);
  58         void            (*ccid_hc_tx_exit)(struct sock *sk);
  59         void            (*ccid_hc_rx_packet_recv)(struct sock *sk,
  60                                                   struct sk_buff *skb);
  61         int             (*ccid_hc_rx_parse_options)(struct sock *sk,
  62                                                     unsigned char option,
  63                                                     unsigned char len, u16 idx,
  64                                                     unsigned char* value);
  65         int             (*ccid_hc_rx_insert_options)(struct sock *sk,
  66                                                      struct sk_buff *skb);
  67         void            (*ccid_hc_tx_packet_recv)(struct sock *sk,
  68                                                   struct sk_buff *skb);
  69         int             (*ccid_hc_tx_parse_options)(struct sock *sk,
  70                                                     unsigned char option,
  71                                                     unsigned char len, u16 idx,
  72                                                     unsigned char* value);
  73         int             (*ccid_hc_tx_send_packet)(struct sock *sk,
  74                                                   struct sk_buff *skb);
  75         void            (*ccid_hc_tx_packet_sent)(struct sock *sk,
  76                                                   int more, unsigned int len);
  77         void            (*ccid_hc_rx_get_info)(struct sock *sk,
  78                                                struct tcp_info *info);
  79         void            (*ccid_hc_tx_get_info)(struct sock *sk,
  80                                                struct tcp_info *info);
  81         int             (*ccid_hc_rx_getsockopt)(struct sock *sk,
  82                                                  const int optname, int len,
  83                                                  u32 __user *optval,
  84                                                  int __user *optlen);
  85         int             (*ccid_hc_tx_getsockopt)(struct sock *sk,
  86                                                  const int optname, int len,
  87                                                  u32 __user *optval,
  88                                                  int __user *optlen);
  89 };
  90
  91 extern struct ccid_operations ccid2_ops;
  92 #ifdef CONFIG_IP_DCCP_CCID3
  93 extern struct ccid_operations ccid3_ops;
  94 #endif
  95
  96 extern int  ccid_initialize_builtins(void);
  97 extern void ccid_cleanup_builtins(void);
  98
  99 struct ccid {
 100         struct ccid_operations *ccid_ops;
 101         char                   ccid_priv[0];
 102 };
 103
 104 static inline void *ccid_priv(const struct ccid *ccid)
 105 {
 106         return (void *)ccid->ccid_priv;
 107 }
 108
 109 extern bool ccid_support_check(u8 const *ccid_array, u8 array_len);
 110 extern int  ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len);
 111 extern int  ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
 112                                           char __user *, int __user *);
 113
 114 extern struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx);
 115
 116 static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
 117 {
 118         struct ccid *ccid = dp->dccps_hc_rx_ccid;
 119
 120         if (ccid == NULL || ccid->ccid_ops == NULL)
 121                 return -1;
 122         return ccid->ccid_ops->ccid_id;
 123 }
 124
 125 static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
 126 {
 127         struct ccid *ccid = dp->dccps_hc_tx_ccid;
 128
 129         if (ccid == NULL || ccid->ccid_ops == NULL)
 130                 return -1;
 131         return ccid->ccid_ops->ccid_id;
 132 }
 133
 134 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
 135 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
 136
 137 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
 138                                          struct sk_buff *skb)
 139 {
 140         int rc = 0;
 141         if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
 142                 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
 143         return rc;
 144 }
 145
 146 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
 147                                           int more, unsigned int len)
 148 {
 149         if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
 150                 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
 151 }
 152
 153 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
 154                                           struct sk_buff *skb)
 155 {
 156         if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
 157                 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
 158 }
 159
 160 static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
 161                                           struct sk_buff *skb)
 162 {
 163         if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
 164                 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
 165 }
 166
 167 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
 168                                            unsigned char option,
 169                                            unsigned char len, u16 idx,
 170                                            unsigned char* value)
 171 {
 172         int rc = 0;
 173         if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
 174                 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
 175                                                     value);
 176         return rc;
 177 }
 178
 179 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
 180                                            unsigned char option,
 181                                            unsigned char len, u16 idx,
 182                                            unsigned char* value)
 183 {
 184         int rc = 0;
 185         if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
 186                 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
 187         return rc;
 188 }
 189
 190 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
 191                                             struct sk_buff *skb)
 192 {
 193         if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
 194                 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
 195         return 0;
 196 }
 197
 198 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
 199                                        struct tcp_info *info)
 200 {
 201         if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
 202                 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
 203 }
 204
 205 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
 206                                        struct tcp_info *info)
 207 {
 208         if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
 209                 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
 210 }
 211
 212 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
 213                                         const int optname, int len,
 214                                         u32 __user *optval, int __user *optlen)
 215 {
 216         int rc = -ENOPROTOOPT;
 217         if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
 218                 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
 219                                                  optval, optlen);
 220         return rc;
 221 }
 222
 223 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
 224                                         const int optname, int len,
 225                                         u32 __user *optval, int __user *optlen)
 226 {
 227         int rc = -ENOPROTOOPT;
 228         if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
 229                 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,
 230                                                  optval, optlen);
 231         return rc;
 232 }
 233 #endif /* _CCID_H */