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
, u8 pkt
,
64 u8 opt
, u8
*val
, u8 len
);
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
, u8 pkt
,
70 u8 opt
, u8
*val
, u8 len
);
71 int (*ccid_hc_tx_send_packet
)(struct sock
*sk
,
73 void (*ccid_hc_tx_packet_sent
)(struct sock
*sk
,
75 void (*ccid_hc_rx_get_info
)(struct sock
*sk
,
76 struct tcp_info
*info
);
77 void (*ccid_hc_tx_get_info
)(struct sock
*sk
,
78 struct tcp_info
*info
);
79 int (*ccid_hc_rx_getsockopt
)(struct sock
*sk
,
80 const int optname
, int len
,
83 int (*ccid_hc_tx_getsockopt
)(struct sock
*sk
,
84 const int optname
, int len
,
89 extern int ccid_register(struct ccid_operations
*ccid_ops
);
90 extern int ccid_unregister(struct ccid_operations
*ccid_ops
);
93 struct ccid_operations
*ccid_ops
;
97 static inline void *ccid_priv(const struct ccid
*ccid
)
99 return (void *)ccid
->ccid_priv
;
102 extern bool ccid_support_check(u8
const *ccid_array
, u8 array_len
);
103 extern int ccid_get_builtin_ccids(u8
**ccid_array
, u8
*array_len
);
104 extern int ccid_getsockopt_builtin_ccids(struct sock
*sk
, int len
,
105 char __user
*, int __user
*);
107 extern int ccid_request_modules(u8
const *ccid_array
, u8 array_len
);
108 extern struct ccid
*ccid_new(unsigned char id
, struct sock
*sk
, int rx
,
111 static inline int ccid_get_current_rx_ccid(struct dccp_sock
*dp
)
113 struct ccid
*ccid
= dp
->dccps_hc_rx_ccid
;
115 if (ccid
== NULL
|| ccid
->ccid_ops
== NULL
)
117 return ccid
->ccid_ops
->ccid_id
;
120 static inline int ccid_get_current_tx_ccid(struct dccp_sock
*dp
)
122 struct ccid
*ccid
= dp
->dccps_hc_tx_ccid
;
124 if (ccid
== NULL
|| ccid
->ccid_ops
== NULL
)
126 return ccid
->ccid_ops
->ccid_id
;
129 extern void ccid_hc_rx_delete(struct ccid
*ccid
, struct sock
*sk
);
130 extern void ccid_hc_tx_delete(struct ccid
*ccid
, struct sock
*sk
);
132 static inline int ccid_hc_tx_send_packet(struct ccid
*ccid
, struct sock
*sk
,
136 if (ccid
->ccid_ops
->ccid_hc_tx_send_packet
!= NULL
)
137 rc
= ccid
->ccid_ops
->ccid_hc_tx_send_packet(sk
, skb
);
141 static inline void ccid_hc_tx_packet_sent(struct ccid
*ccid
, struct sock
*sk
,
144 if (ccid
->ccid_ops
->ccid_hc_tx_packet_sent
!= NULL
)
145 ccid
->ccid_ops
->ccid_hc_tx_packet_sent(sk
, len
);
148 static inline void ccid_hc_rx_packet_recv(struct ccid
*ccid
, struct sock
*sk
,
151 if (ccid
->ccid_ops
->ccid_hc_rx_packet_recv
!= NULL
)
152 ccid
->ccid_ops
->ccid_hc_rx_packet_recv(sk
, skb
);
155 static inline void ccid_hc_tx_packet_recv(struct ccid
*ccid
, struct sock
*sk
,
158 if (ccid
->ccid_ops
->ccid_hc_tx_packet_recv
!= NULL
)
159 ccid
->ccid_ops
->ccid_hc_tx_packet_recv(sk
, skb
);
163 * ccid_hc_tx_parse_options - Parse CCID-specific options sent by the receiver
164 * @pkt: type of packet that @opt appears on (RFC 4340, 5.1)
165 * @opt: the CCID-specific option type (RFC 4340, 5.8 and 10.3)
166 * @val: value of @opt
167 * @len: length of @val in bytes
169 static inline int ccid_hc_tx_parse_options(struct ccid
*ccid
, struct sock
*sk
,
170 u8 pkt
, u8 opt
, u8
*val
, u8 len
)
172 if (ccid
->ccid_ops
->ccid_hc_tx_parse_options
== NULL
)
174 return ccid
->ccid_ops
->ccid_hc_tx_parse_options(sk
, pkt
, opt
, val
, len
);
178 * ccid_hc_rx_parse_options - Parse CCID-specific options sent by the sender
179 * Arguments are analogous to ccid_hc_tx_parse_options()
181 static inline int ccid_hc_rx_parse_options(struct ccid
*ccid
, struct sock
*sk
,
182 u8 pkt
, u8 opt
, u8
*val
, u8 len
)
184 if (ccid
->ccid_ops
->ccid_hc_rx_parse_options
== NULL
)
186 return ccid
->ccid_ops
->ccid_hc_rx_parse_options(sk
, pkt
, opt
, val
, len
);
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
,