6 * An implementation of the DCCP protocol
7 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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.
17 #include <linux/compiler.h>
18 #include <linux/dccp.h>
19 #include <linux/list.h>
20 #include <linux/module.h>
27 * struct ccid_operations - Interface to Congestion-Control Infrastructure
29 * @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.)
30 * @ccid_name: alphabetical identifier string for @ccid_id
31 * @ccid_owner: module which implements/owns this CCID
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
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
46 struct ccid_operations {
47 unsigned char ccid_id;
48 const char *ccid_name;
49 struct module *ccid_owner;
50 struct kmem_cache *ccid_hc_rx_slab,
52 __u32 ccid_hc_rx_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,
61 int (*ccid_hc_rx_parse_options)(struct sock *sk,
63 unsigned char len, u16 idx,
64 unsigned char* value);
65 int (*ccid_hc_rx_insert_options)(struct sock *sk,
67 void (*ccid_hc_tx_packet_recv)(struct sock *sk,
69 int (*ccid_hc_tx_parse_options)(struct sock *sk,
71 unsigned char len, u16 idx,
72 unsigned char* value);
73 int (*ccid_hc_tx_send_packet)(struct sock *sk,
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,
85 int (*ccid_hc_tx_getsockopt)(struct sock *sk,
86 const int optname, int len,
91 extern int ccid_register(struct ccid_operations *ccid_ops);
92 extern int ccid_unregister(struct ccid_operations *ccid_ops);
95 struct ccid_operations *ccid_ops;
99 static inline void *ccid_priv(const struct ccid *ccid)
101 return (void *)ccid->ccid_priv;
104 extern struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx,
107 extern struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk,
109 extern struct ccid *ccid_hc_tx_new(unsigned char id, struct sock *sk,
112 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
113 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
115 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
119 if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
120 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
124 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
125 int more, unsigned int len)
127 if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
128 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
131 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
134 if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
135 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
138 static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
141 if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
142 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
145 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
146 unsigned char option,
147 unsigned char len, u16 idx,
148 unsigned char* value)
151 if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
152 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
157 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
158 unsigned char option,
159 unsigned char len, u16 idx,
160 unsigned char* value)
163 if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
164 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
168 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
171 if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
172 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
176 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
177 struct tcp_info *info)
179 if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
180 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
183 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
184 struct tcp_info *info)
186 if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
187 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
190 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
191 const int optname, int len,
192 u32 __user *optval, int __user *optlen)
194 int rc = -ENOPROTOOPT;
195 if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
196 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
201 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
202 const int optname, int len,
203 u32 __user *optval, int __user *optlen)
205 int rc = -ENOPROTOOPT;
206 if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
207 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,