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(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,
147 int more, unsigned int len)
149 if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
150 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, 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);
167 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
168 unsigned char option,
169 unsigned char len, u16 idx,
170 unsigned char* value)
173 if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
174 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
179 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
180 unsigned char option,
181 unsigned char len, u16 idx,
182 unsigned char* value)
185 if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
186 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
190 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
193 if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
194 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
198 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
199 struct tcp_info *info)
201 if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
202 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
205 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
206 struct tcp_info *info)
208 if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
209 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
212 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
213 const int optname, int len,
214 u32 __user *optval, int __user *optlen)
216 int rc = -ENOPROTOOPT;
217 if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
218 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
223 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
224 const int optname, int len,
225 u32 __user *optval, int __user *optlen)
227 int rc = -ENOPROTOOPT;
228 if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
229 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,