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_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
;
49 const char *ccid_name
;
50 struct kmem_cache
*ccid_hc_rx_slab
,
52 char ccid_hc_rx_slab_name
[32];
53 char ccid_hc_tx_slab_name
[32];
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 struct ccid_operations ccid2_ops
;
94 #ifdef CONFIG_IP_DCCP_CCID3
95 extern struct ccid_operations ccid3_ops
;
98 extern int ccid_initialize_builtins(void);
99 extern void ccid_cleanup_builtins(void);
102 struct ccid_operations
*ccid_ops
;
106 static inline void *ccid_priv(const struct ccid
*ccid
)
108 return (void *)ccid
->ccid_priv
;
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
*);
116 extern struct ccid
*ccid_new(const u8 id
, struct sock
*sk
, bool rx
);
118 static inline int ccid_get_current_rx_ccid(struct dccp_sock
*dp
)
120 struct ccid
*ccid
= dp
->dccps_hc_rx_ccid
;
122 if (ccid
== NULL
|| ccid
->ccid_ops
== NULL
)
124 return ccid
->ccid_ops
->ccid_id
;
127 static inline int ccid_get_current_tx_ccid(struct dccp_sock
*dp
)
129 struct ccid
*ccid
= dp
->dccps_hc_tx_ccid
;
131 if (ccid
== NULL
|| ccid
->ccid_ops
== NULL
)
133 return ccid
->ccid_ops
->ccid_id
;
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
);
139 static inline int ccid_hc_tx_send_packet(struct ccid
*ccid
, struct sock
*sk
,
143 if (ccid
->ccid_ops
->ccid_hc_tx_send_packet
!= NULL
)
144 rc
= ccid
->ccid_ops
->ccid_hc_tx_send_packet(sk
, skb
);
148 static inline void ccid_hc_tx_packet_sent(struct ccid
*ccid
, struct sock
*sk
,
149 int more
, unsigned int len
)
151 if (ccid
->ccid_ops
->ccid_hc_tx_packet_sent
!= NULL
)
152 ccid
->ccid_ops
->ccid_hc_tx_packet_sent(sk
, more
, len
);
155 static inline void ccid_hc_rx_packet_recv(struct ccid
*ccid
, struct sock
*sk
,
158 if (ccid
->ccid_ops
->ccid_hc_rx_packet_recv
!= NULL
)
159 ccid
->ccid_ops
->ccid_hc_rx_packet_recv(sk
, skb
);
162 static inline void ccid_hc_tx_packet_recv(struct ccid
*ccid
, struct sock
*sk
,
165 if (ccid
->ccid_ops
->ccid_hc_tx_packet_recv
!= NULL
)
166 ccid
->ccid_ops
->ccid_hc_tx_packet_recv(sk
, skb
);
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
)
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
,
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
)
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
);
192 static inline int ccid_hc_rx_insert_options(struct ccid
*ccid
, struct sock
*sk
,
195 if (ccid
->ccid_ops
->ccid_hc_rx_insert_options
!= NULL
)
196 return ccid
->ccid_ops
->ccid_hc_rx_insert_options(sk
, skb
);
200 static inline void ccid_hc_rx_get_info(struct ccid
*ccid
, struct sock
*sk
,
201 struct tcp_info
*info
)
203 if (ccid
->ccid_ops
->ccid_hc_rx_get_info
!= NULL
)
204 ccid
->ccid_ops
->ccid_hc_rx_get_info(sk
, info
);
207 static inline void ccid_hc_tx_get_info(struct ccid
*ccid
, struct sock
*sk
,
208 struct tcp_info
*info
)
210 if (ccid
->ccid_ops
->ccid_hc_tx_get_info
!= NULL
)
211 ccid
->ccid_ops
->ccid_hc_tx_get_info(sk
, info
);
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
)
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
,
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
)
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
,