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>
22 /* maximum value for a CCID (RFC 4340, 19.5) */
24 #define CCID_SLAB_NAME_LENGTH 32
29 * struct ccid_operations - Interface to Congestion-Control Infrastructure
31 * @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.)
32 * @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled)
33 * @ccid_name: alphabetical identifier string for @ccid_id
34 * @ccid_hc_{r,t}x_slab: memory pool for the receiver/sender half-connection
35 * @ccid_hc_{r,t}x_obj_size: size of the receiver/sender half-connection socket
37 * @ccid_hc_{r,t}x_init: CCID-specific initialisation routine (before startup)
38 * @ccid_hc_{r,t}x_exit: CCID-specific cleanup routine (before destruction)
39 * @ccid_hc_rx_packet_recv: implements the HC-receiver side
40 * @ccid_hc_{r,t}x_parse_options: parsing routine for CCID/HC-specific options
41 * @ccid_hc_{r,t}x_insert_options: insert routine for CCID/HC-specific options
42 * @ccid_hc_tx_packet_recv: implements feedback processing for the HC-sender
43 * @ccid_hc_tx_send_packet: implements the sending part of the HC-sender
44 * @ccid_hc_tx_packet_sent: does accounting for packets in flight by HC-sender
45 * @ccid_hc_{r,t}x_get_info: INET_DIAG information for HC-receiver/sender
46 * @ccid_hc_{r,t}x_getsockopt: socket options specific to HC-receiver/sender
48 struct ccid_operations
{
49 unsigned char ccid_id
;
51 const char *ccid_name
;
52 struct kmem_cache
*ccid_hc_rx_slab
,
54 char ccid_hc_rx_slab_name
[CCID_SLAB_NAME_LENGTH
];
55 char ccid_hc_tx_slab_name
[CCID_SLAB_NAME_LENGTH
];
56 __u32 ccid_hc_rx_obj_size
,
58 /* Interface Routines */
59 int (*ccid_hc_rx_init
)(struct ccid
*ccid
, struct sock
*sk
);
60 int (*ccid_hc_tx_init
)(struct ccid
*ccid
, struct sock
*sk
);
61 void (*ccid_hc_rx_exit
)(struct sock
*sk
);
62 void (*ccid_hc_tx_exit
)(struct sock
*sk
);
63 void (*ccid_hc_rx_packet_recv
)(struct sock
*sk
,
65 int (*ccid_hc_rx_parse_options
)(struct sock
*sk
, u8 pkt
,
66 u8 opt
, u8
*val
, u8 len
);
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
, u8 pkt
,
72 u8 opt
, u8
*val
, u8 len
);
73 int (*ccid_hc_tx_send_packet
)(struct sock
*sk
,
75 void (*ccid_hc_tx_packet_sent
)(struct sock
*sk
,
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 struct ccid_operations ccid2_ops
;
92 #ifdef CONFIG_IP_DCCP_CCID3
93 extern struct ccid_operations ccid3_ops
;
96 extern int ccid_initialize_builtins(void);
97 extern void ccid_cleanup_builtins(void);
100 struct ccid_operations
*ccid_ops
;
104 static inline void *ccid_priv(const struct ccid
*ccid
)
106 return (void *)ccid
->ccid_priv
;
109 extern bool ccid_support_check(u8
const *ccid_array
, u8 array_len
);
110 extern int ccid_get_builtin_ccids(u8
**ccid_array
, u8
*array_len
);
111 extern int ccid_getsockopt_builtin_ccids(struct sock
*sk
, int len
,
112 char __user
*, int __user
*);
114 extern struct ccid
*ccid_new(const u8 id
, struct sock
*sk
, bool rx
);
116 static inline int ccid_get_current_rx_ccid(struct dccp_sock
*dp
)
118 struct ccid
*ccid
= dp
->dccps_hc_rx_ccid
;
120 if (ccid
== NULL
|| ccid
->ccid_ops
== NULL
)
122 return ccid
->ccid_ops
->ccid_id
;
125 static inline int ccid_get_current_tx_ccid(struct dccp_sock
*dp
)
127 struct ccid
*ccid
= dp
->dccps_hc_tx_ccid
;
129 if (ccid
== NULL
|| ccid
->ccid_ops
== NULL
)
131 return ccid
->ccid_ops
->ccid_id
;
134 extern void ccid_hc_rx_delete(struct ccid
*ccid
, struct sock
*sk
);
135 extern void ccid_hc_tx_delete(struct ccid
*ccid
, struct sock
*sk
);
137 static inline int ccid_hc_tx_send_packet(struct ccid
*ccid
, struct sock
*sk
,
141 if (ccid
->ccid_ops
->ccid_hc_tx_send_packet
!= NULL
)
142 rc
= ccid
->ccid_ops
->ccid_hc_tx_send_packet(sk
, skb
);
146 static inline void ccid_hc_tx_packet_sent(struct ccid
*ccid
, struct sock
*sk
,
149 if (ccid
->ccid_ops
->ccid_hc_tx_packet_sent
!= NULL
)
150 ccid
->ccid_ops
->ccid_hc_tx_packet_sent(sk
, len
);
153 static inline void ccid_hc_rx_packet_recv(struct ccid
*ccid
, struct sock
*sk
,
156 if (ccid
->ccid_ops
->ccid_hc_rx_packet_recv
!= NULL
)
157 ccid
->ccid_ops
->ccid_hc_rx_packet_recv(sk
, skb
);
160 static inline void ccid_hc_tx_packet_recv(struct ccid
*ccid
, struct sock
*sk
,
163 if (ccid
->ccid_ops
->ccid_hc_tx_packet_recv
!= NULL
)
164 ccid
->ccid_ops
->ccid_hc_tx_packet_recv(sk
, skb
);
168 * ccid_hc_tx_parse_options - Parse CCID-specific options sent by the receiver
169 * @pkt: type of packet that @opt appears on (RFC 4340, 5.1)
170 * @opt: the CCID-specific option type (RFC 4340, 5.8 and 10.3)
171 * @val: value of @opt
172 * @len: length of @val in bytes
174 static inline int ccid_hc_tx_parse_options(struct ccid
*ccid
, struct sock
*sk
,
175 u8 pkt
, u8 opt
, u8
*val
, u8 len
)
177 if (ccid
->ccid_ops
->ccid_hc_tx_parse_options
== NULL
)
179 return ccid
->ccid_ops
->ccid_hc_tx_parse_options(sk
, pkt
, opt
, val
, len
);
183 * ccid_hc_rx_parse_options - Parse CCID-specific options sent by the sender
184 * Arguments are analogous to ccid_hc_tx_parse_options()
186 static inline int ccid_hc_rx_parse_options(struct ccid
*ccid
, struct sock
*sk
,
187 u8 pkt
, u8 opt
, u8
*val
, u8 len
)
189 if (ccid
->ccid_ops
->ccid_hc_rx_parse_options
== NULL
)
191 return ccid
->ccid_ops
->ccid_hc_rx_parse_options(sk
, pkt
, opt
, val
, len
);
194 static inline int ccid_hc_rx_insert_options(struct ccid
*ccid
, struct sock
*sk
,
197 if (ccid
->ccid_ops
->ccid_hc_rx_insert_options
!= NULL
)
198 return ccid
->ccid_ops
->ccid_hc_rx_insert_options(sk
, skb
);
202 static inline void ccid_hc_rx_get_info(struct ccid
*ccid
, struct sock
*sk
,
203 struct tcp_info
*info
)
205 if (ccid
->ccid_ops
->ccid_hc_rx_get_info
!= NULL
)
206 ccid
->ccid_ops
->ccid_hc_rx_get_info(sk
, info
);
209 static inline void ccid_hc_tx_get_info(struct ccid
*ccid
, struct sock
*sk
,
210 struct tcp_info
*info
)
212 if (ccid
->ccid_ops
->ccid_hc_tx_get_info
!= NULL
)
213 ccid
->ccid_ops
->ccid_hc_tx_get_info(sk
, info
);
216 static inline int ccid_hc_rx_getsockopt(struct ccid
*ccid
, struct sock
*sk
,
217 const int optname
, int len
,
218 u32 __user
*optval
, int __user
*optlen
)
220 int rc
= -ENOPROTOOPT
;
221 if (ccid
->ccid_ops
->ccid_hc_rx_getsockopt
!= NULL
)
222 rc
= ccid
->ccid_ops
->ccid_hc_rx_getsockopt(sk
, optname
, len
,
227 static inline int ccid_hc_tx_getsockopt(struct ccid
*ccid
, struct sock
*sk
,
228 const int optname
, int len
,
229 u32 __user
*optval
, int __user
*optlen
)
231 int rc
= -ENOPROTOOPT
;
232 if (ccid
->ccid_ops
->ccid_hc_tx_getsockopt
!= NULL
)
233 rc
= ccid
->ccid_ops
->ccid_hc_tx_getsockopt(sk
, optname
, len
,