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/* maximum value for a CCID (RFC 4340, 19.5) */ 23#define CCID_MAX 255 24#define CCID_SLAB_NAME_LENGTH 32 25 26struct tcp_info; 27 28/** 29 * struct ccid_operations - Interface to Congestion-Control Infrastructure 30 * 31 * @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.) 32 * @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled) 33 * @ccid_name: alphabetical identifier string for @ccid_id 34 * @ccid_hc_{r,t}x_slab: memory pool for the receiver/sender half-connection 35 * @ccid_hc_{r,t}x_obj_size: size of the receiver/sender half-connection socket 36 * 37 * @ccid_hc_{r,t}x_init: CCID-specific initialisation routine (before startup) 38 * @ccid_hc_{r,t}x_exit: CCID-specific cleanup routine (before destruction) 39 * @ccid_hc_rx_packet_recv: implements the HC-receiver side 40 * @ccid_hc_{r,t}x_parse_options: parsing routine for CCID/HC-specific options 41 * @ccid_hc_{r,t}x_insert_options: insert routine for CCID/HC-specific options 42 * @ccid_hc_tx_packet_recv: implements feedback processing for the HC-sender 43 * @ccid_hc_tx_send_packet: implements the sending part of the HC-sender 44 * @ccid_hc_tx_packet_sent: does accounting for packets in flight by HC-sender 45 * @ccid_hc_{r,t}x_get_info: INET_DIAG information for HC-receiver/sender 46 * @ccid_hc_{r,t}x_getsockopt: socket options specific to HC-receiver/sender 47 */ 48struct ccid_operations { 49 unsigned char ccid_id; 50 __u32 ccid_ccmps; 51 const char *ccid_name; 52 struct kmem_cache *ccid_hc_rx_slab, 53 *ccid_hc_tx_slab; 54 char ccid_hc_rx_slab_name[CCID_SLAB_NAME_LENGTH]; 55 char ccid_hc_tx_slab_name[CCID_SLAB_NAME_LENGTH]; 56 __u32 ccid_hc_rx_obj_size, 57 ccid_hc_tx_obj_size; 58 /* Interface Routines */ 59 int (*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk); 60 int (*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk); 61 void (*ccid_hc_rx_exit)(struct sock *sk); 62 void (*ccid_hc_tx_exit)(struct sock *sk); 63 void (*ccid_hc_rx_packet_recv)(struct sock *sk, 64 struct sk_buff *skb); 65 int (*ccid_hc_rx_parse_options)(struct sock *sk, 66 unsigned char option, 67 unsigned char len, u16 idx, 68 unsigned char* value); 69 int (*ccid_hc_rx_insert_options)(struct sock *sk, 70 struct sk_buff *skb); 71 void (*ccid_hc_tx_packet_recv)(struct sock *sk, 72 struct sk_buff *skb); 73 int (*ccid_hc_tx_parse_options)(struct sock *sk, 74 unsigned char option, 75 unsigned char len, u16 idx, 76 unsigned char* value); 77 int (*ccid_hc_tx_send_packet)(struct sock *sk, 78 struct sk_buff *skb); 79 void (*ccid_hc_tx_packet_sent)(struct sock *sk, 80 int more, unsigned int len); 81 void (*ccid_hc_rx_get_info)(struct sock *sk, 82 struct tcp_info *info); 83 void (*ccid_hc_tx_get_info)(struct sock *sk, 84 struct tcp_info *info); 85 int (*ccid_hc_rx_getsockopt)(struct sock *sk, 86 const int optname, int len, 87 u32 __user *optval, 88 int __user *optlen); 89 int (*ccid_hc_tx_getsockopt)(struct sock *sk, 90 const int optname, int len, 91 u32 __user *optval, 92 int __user *optlen); 93}; 94 95extern struct ccid_operations ccid2_ops; 96#ifdef CONFIG_IP_DCCP_CCID3 97extern struct ccid_operations ccid3_ops; 98#endif 99 100extern int ccid_initialize_builtins(void); 101extern void ccid_cleanup_builtins(void); 102 103struct ccid { 104 struct ccid_operations *ccid_ops; 105 char ccid_priv[0]; 106}; 107 108static inline void *ccid_priv(const struct ccid *ccid) 109{ 110 return (void *)ccid->ccid_priv; 111} 112 113extern bool ccid_support_check(u8 const *ccid_array, u8 array_len); 114extern int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len); 115extern int ccid_getsockopt_builtin_ccids(struct sock *sk, int len, 116 char __user *, int __user *); 117 118extern struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx); 119 120static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp) 121{ 122 struct ccid *ccid = dp->dccps_hc_rx_ccid; 123 124 if (ccid == NULL || ccid->ccid_ops == NULL) 125 return -1; 126 return ccid->ccid_ops->ccid_id; 127} 128 129static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp) 130{ 131 struct ccid *ccid = dp->dccps_hc_tx_ccid; 132 133 if (ccid == NULL || ccid->ccid_ops == NULL) 134 return -1; 135 return ccid->ccid_ops->ccid_id; 136} 137 138extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk); 139extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk); 140 141static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk, 142 struct sk_buff *skb) 143{ 144 int rc = 0; 145 if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL) 146 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb); 147 return rc; 148} 149 150static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk, 151 int more, unsigned int len) 152{ 153 if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL) 154 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len); 155} 156 157static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk, 158 struct sk_buff *skb) 159{ 160 if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL) 161 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb); 162} 163 164static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk, 165 struct sk_buff *skb) 166{ 167 if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL) 168 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb); 169} 170 171static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk, 172 unsigned char option, 173 unsigned char len, u16 idx, 174 unsigned char* value) 175{ 176 int rc = 0; 177 if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL) 178 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx, 179 value); 180 return rc; 181} 182 183static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk, 184 unsigned char option, 185 unsigned char len, u16 idx, 186 unsigned char* value) 187{ 188 int rc = 0; 189 if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL) 190 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value); 191 return rc; 192} 193 194static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk, 195 struct sk_buff *skb) 196{ 197 if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL) 198 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb); 199 return 0; 200} 201 202static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk, 203 struct tcp_info *info) 204{ 205 if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL) 206 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info); 207} 208 209static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk, 210 struct tcp_info *info) 211{ 212 if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL) 213 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info); 214} 215 216static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk, 217 const int optname, int len, 218 u32 __user *optval, int __user *optlen) 219{ 220 int rc = -ENOPROTOOPT; 221 if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL) 222 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len, 223 optval, optlen); 224 return rc; 225} 226 227static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk, 228 const int optname, int len, 229 u32 __user *optval, int __user *optlen) 230{ 231 int rc = -ENOPROTOOPT; 232 if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL) 233 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len, 234 optval, optlen); 235 return rc; 236} 237#endif /* _CCID_H */ 238