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 */ 214