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_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
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
47 struct ccid_operations {
48 unsigned char ccid_id;
50 const char *ccid_name;
51 struct module *ccid_owner;
52 struct kmem_cache *ccid_hc_rx_slab,
54 __u32 ccid_hc_rx_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,
63 int (*ccid_hc_rx_parse_options)(struct sock *sk,
65 unsigned char len, u16 idx,
66 unsigned char* value);
67 int (*ccid_hc_rx_insert_options)(struct sock *sk,
69 void (*ccid_hc_tx_packet_recv)(struct sock *sk,
71 int (*ccid_hc_tx_parse_options)(struct sock *sk,
73 unsigned char len, u16 idx,
74 unsigned char* value);
75 int (*ccid_hc_tx_send_packet)(struct sock *sk,
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,
87 int (*ccid_hc_tx_getsockopt)(struct sock *sk,
88 const int optname, int len,
93 extern int ccid_register(struct ccid_operations *ccid_ops);
94 extern int ccid_unregister(struct ccid_operations *ccid_ops);
97 struct ccid_operations *ccid_ops;
101 static inline void *ccid_priv(const struct ccid *ccid)
103 return (void *)ccid->ccid_priv;
106 extern bool ccid_support_check(u8 const *ccid_array, u8 array_len);
107 extern int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len);
108 extern int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
109 char __user *, int __user *);
111 extern int ccid_request_modules(u8 const *ccid_array, u8 array_len);
112 extern struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx,
115 static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
117 struct ccid *ccid = dp->dccps_hc_rx_ccid;
119 if (ccid == NULL || ccid->ccid_ops == NULL)
121 return ccid->ccid_ops->ccid_id;
124 static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
126 struct ccid *ccid = dp->dccps_hc_tx_ccid;
128 if (ccid == NULL || ccid->ccid_ops == NULL)
130 return ccid->ccid_ops->ccid_id;
133 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
134 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
136 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
140 if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
141 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
145 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
146 int more, unsigned int len)
148 if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
149 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
152 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
155 if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
156 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
159 static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
162 if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
163 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
166 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
167 unsigned char option,
168 unsigned char len, u16 idx,
169 unsigned char* value)
172 if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
173 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
178 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
179 unsigned char option,
180 unsigned char len, u16 idx,
181 unsigned char* value)
184 if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
185 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
189 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
192 if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
193 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
197 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
198 struct tcp_info *info)
200 if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
201 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
204 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
205 struct tcp_info *info)
207 if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
208 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
211 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
212 const int optname, int len,
213 u32 __user *optval, int __user *optlen)
215 int rc = -ENOPROTOOPT;
216 if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
217 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
222 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
223 const int optname, int len,
224 u32 __user *optval, int __user *optlen)
226 int rc = -ENOPROTOOPT;
227 if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
228 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,