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 char ccid_hc_rx_slab_name[32]; 53 char ccid_hc_tx_slab_name[32]; 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 struct ccid_operations ccid2_ops; 94 #ifdef CONFIG_IP_DCCP_CCID3 95 extern struct ccid_operations ccid3_ops; 96 #endif 97 98 extern int ccid_initialize_builtins(void); 99 extern void ccid_cleanup_builtins(void); 100 101 struct ccid { 102 struct ccid_operations *ccid_ops; 103 char ccid_priv[0]; 104 }; 105 106 static inline void *ccid_priv(const struct ccid *ccid) 107 { 108 return (void *)ccid->ccid_priv; 109 } 110 111 extern bool ccid_support_check(u8 const *ccid_array, u8 array_len); 112 extern int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len); 113 extern int ccid_getsockopt_builtin_ccids(struct sock *sk, int len, 114 char __user *, int __user *); 115 116 extern struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx); 117 118 static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp) 119 { 120 struct ccid *ccid = dp->dccps_hc_rx_ccid; 121 122 if (ccid == NULL || ccid->ccid_ops == NULL) 123 return -1; 124 return ccid->ccid_ops->ccid_id; 125 } 126 127 static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp) 128 { 129 struct ccid *ccid = dp->dccps_hc_tx_ccid; 130 131 if (ccid == NULL || ccid->ccid_ops == NULL) 132 return -1; 133 return ccid->ccid_ops->ccid_id; 134 } 135 136 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk); 137 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk); 138 139 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk, 140 struct sk_buff *skb) 141 { 142 int rc = 0; 143 if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL) 144 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb); 145 return rc; 146 } 147 148 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk, 149 int more, unsigned int len) 150 { 151 if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL) 152 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len); 153 } 154 155 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk, 156 struct sk_buff *skb) 157 { 158 if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL) 159 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb); 160 } 161 162 static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk, 163 struct sk_buff *skb) 164 { 165 if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL) 166 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb); 167 } 168 169 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk, 170 unsigned char option, 171 unsigned char len, u16 idx, 172 unsigned char* value) 173 { 174 int rc = 0; 175 if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL) 176 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx, 177 value); 178 return rc; 179 } 180 181 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk, 182 unsigned char option, 183 unsigned char len, u16 idx, 184 unsigned char* value) 185 { 186 int rc = 0; 187 if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL) 188 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value); 189 return rc; 190 } 191 192 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk, 193 struct sk_buff *skb) 194 { 195 if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL) 196 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb); 197 return 0; 198 } 199 200 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk, 201 struct tcp_info *info) 202 { 203 if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL) 204 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info); 205 } 206 207 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk, 208 struct tcp_info *info) 209 { 210 if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL) 211 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info); 212 } 213 214 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk, 215 const int optname, int len, 216 u32 __user *optval, int __user *optlen) 217 { 218 int rc = -ENOPROTOOPT; 219 if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL) 220 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len, 221 optval, optlen); 222 return rc; 223 } 224 225 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk, 226 const int optname, int len, 227 u32 __user *optval, int __user *optlen) 228 { 229 int rc = -ENOPROTOOPT; 230 if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL) 231 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len, 232 optval, optlen); 233 return rc; 234 } 235 #endif /* _CCID_H */ 236