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_owner: module which implements/owns this CCID
  33  *  @ccid_hc_{r,t}x_slab: memory pool for the receiver/sender half-connection
  34  *  @ccid_hc_{r,t}x_obj_size: size of the receiver/sender half-connection socket
  35  *
  36  *  @ccid_hc_{r,t}x_init: CCID-specific initialisation routine (before startup)
  37  *  @ccid_hc_{r,t}x_exit: CCID-specific cleanup routine (before destruction)
  38  *  @ccid_hc_rx_packet_recv: implements the HC-receiver side
  39  *  @ccid_hc_{r,t}x_parse_options: parsing routine for CCID/HC-specific options
  40  *  @ccid_hc_{r,t}x_insert_options: insert routine for CCID/HC-specific options
  41  *  @ccid_hc_tx_packet_recv: implements feedback processing for the HC-sender
  42  *  @ccid_hc_tx_send_packet: implements the sending part of the HC-sender
  43  *  @ccid_hc_tx_packet_sent: does accounting for packets in flight by HC-sender
  44  *  @ccid_hc_{r,t}x_get_info: INET_DIAG information for HC-receiver/sender
  45  *  @ccid_hc_{r,t}x_getsockopt: socket options specific to HC-receiver/sender
  46  */
  47 struct ccid_operations {
  48         unsigned char           ccid_id;
  49         __u32                   ccid_ccmps;
  50         const char              *ccid_name;
  51         struct module           *ccid_owner;
  52         struct kmem_cache       *ccid_hc_rx_slab,
  53                                 *ccid_hc_tx_slab;
  54         __u32                   ccid_hc_rx_obj_size,
  55                                 ccid_hc_tx_obj_size;
  56         /* Interface Routines */
  57         int             (*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk);
  58         int             (*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk);
  59         void            (*ccid_hc_rx_exit)(struct sock *sk);
  60         void            (*ccid_hc_tx_exit)(struct sock *sk);
  61         void            (*ccid_hc_rx_packet_recv)(struct sock *sk,
  62                                                   struct sk_buff *skb);
  63         int             (*ccid_hc_rx_parse_options)(struct sock *sk,
  64                                                     unsigned char option,
  65                                                     unsigned char len, u16 idx,
  66                                                     unsigned char* value);
  67         int             (*ccid_hc_rx_insert_options)(struct sock *sk,
  68                                                      struct sk_buff *skb);
  69         void            (*ccid_hc_tx_packet_recv)(struct sock *sk,
  70                                                   struct sk_buff *skb);
  71         int             (*ccid_hc_tx_parse_options)(struct sock *sk,
  72                                                     unsigned char option,
  73                                                     unsigned char len, u16 idx,
  74                                                     unsigned char* value);
  75         int             (*ccid_hc_tx_send_packet)(struct sock *sk,
  76                                                   struct sk_buff *skb);
  77         void            (*ccid_hc_tx_packet_sent)(struct sock *sk,
  78                                                   int more, unsigned int len);
  79         void            (*ccid_hc_rx_get_info)(struct sock *sk,
  80                                                struct tcp_info *info);
  81         void            (*ccid_hc_tx_get_info)(struct sock *sk,
  82                                                struct tcp_info *info);
  83         int             (*ccid_hc_rx_getsockopt)(struct sock *sk,
  84                                                  const int optname, int len,
  85                                                  u32 __user *optval,
  86                                                  int __user *optlen);
  87         int             (*ccid_hc_tx_getsockopt)(struct sock *sk,
  88                                                  const int optname, int len,
  89                                                  u32 __user *optval,
  90                                                  int __user *optlen);
  91 };
  92
  93 extern int ccid_register(struct ccid_operations *ccid_ops);
  94 extern int ccid_unregister(struct ccid_operations *ccid_ops);
  95
  96 struct ccid {
  97         struct ccid_operations *ccid_ops;
  98         char                   ccid_priv[0];
  99 };
 100
 101 static inline void *ccid_priv(const struct ccid *ccid)
 102 {
 103         return (void *)ccid->ccid_priv;
 104 }
 105
 106 extern struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx,
 107                              gfp_t gfp);
 108
 109 extern struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk,
 110                                    gfp_t gfp);
 111 extern struct ccid *ccid_hc_tx_new(unsigned char id, struct sock *sk,
 112                                    gfp_t gfp);
 113
 114 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
 115 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
 116
 117 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
 118                                          struct sk_buff *skb)
 119 {
 120         int rc = 0;
 121         if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
 122                 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
 123         return rc;
 124 }
 125
 126 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
 127                                           int more, unsigned int len)
 128 {
 129         if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
 130                 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
 131 }
 132
 133 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
 134                                           struct sk_buff *skb)
 135 {
 136         if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
 137                 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
 138 }
 139
 140 static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
 141                                           struct sk_buff *skb)
 142 {
 143         if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
 144                 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
 145 }
 146
 147 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
 148                                            unsigned char option,
 149                                            unsigned char len, u16 idx,
 150                                            unsigned char* value)
 151 {
 152         int rc = 0;
 153         if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
 154                 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
 155                                                     value);
 156         return rc;
 157 }
 158
 159 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
 160                                            unsigned char option,
 161                                            unsigned char len, u16 idx,
 162                                            unsigned char* value)
 163 {
 164         int rc = 0;
 165         if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
 166                 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
 167         return rc;
 168 }
 169
 170 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
 171                                             struct sk_buff *skb)
 172 {
 173         if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
 174                 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
 175         return 0;
 176 }
 177
 178 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
 179                                        struct tcp_info *info)
 180 {
 181         if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
 182                 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
 183 }
 184
 185 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
 186                                        struct tcp_info *info)
 187 {
 188         if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
 189                 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
 190 }
 191
 192 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
 193                                         const int optname, int len,
 194                                         u32 __user *optval, int __user *optlen)
 195 {
 196         int rc = -ENOPROTOOPT;
 197         if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
 198                 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
 199                                                  optval, optlen);
 200         return rc;
 201 }
 202
 203 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
 204                                         const int optname, int len,
 205                                         u32 __user *optval, int __user *optlen)
 206 {
 207         int rc = -ENOPROTOOPT;
 208         if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
 209                 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,
 210                                                  optval, optlen);
 211         return rc;
 212 }
 213 #endif /* _CCID_H */