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,