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 __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 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(unsigned char id, struct sock *sk, int rx,
117 static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
119 struct ccid *ccid = dp->dccps_hc_rx_ccid;
121 if (ccid == NULL || ccid->ccid_ops == NULL)
123 return ccid->ccid_ops->ccid_id;
126 static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
128 struct ccid *ccid = dp->dccps_hc_tx_ccid;
130 if (ccid == NULL || ccid->ccid_ops == NULL)
132 return ccid->ccid_ops->ccid_id;
135 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
136 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
138 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
142 if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
143 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
147 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
148 int more, unsigned int len)
150 if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
151 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
154 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
157 if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
158 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
161 static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
164 if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
165 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
168 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
169 unsigned char option,
170 unsigned char len, u16 idx,
171 unsigned char* value)
174 if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
175 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
180 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
181 unsigned char option,
182 unsigned char len, u16 idx,
183 unsigned char* value)
186 if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
187 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
191 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
194 if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
195 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
199 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
200 struct tcp_info *info)
202 if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
203 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
206 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
207 struct tcp_info *info)
209 if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
210 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
213 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
214 const int optname, int len,
215 u32 __user *optval, int __user *optlen)
217 int rc = -ENOPROTOOPT;
218 if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
219 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
224 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
225 const int optname, int len,
226 u32 __user *optval, int __user *optlen)
228 int rc = -ENOPROTOOPT;
229 if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
230 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,