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Merge branch 'pm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspe...
[net-next-2.6.git] / net / dccp / ccid.h
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7c657876
ACM		 1#ifndef _CCID_H
2#define _CCID_H
3/*
4 * net/dccp/ccid.h
5 *
6 * An implementation of the DCCP protocol
7 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
8 *
9 * CCID infrastructure
10 *
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.
14 */
15
16#include <net/sock.h>
88f964db 17#include <linux/compiler.h>
7c657876
ACM		 18#include <linux/dccp.h>
19#include <linux/list.h>
20#include <linux/module.h>
21
8ed030dd
GR		 22/* maximum value for a CCID (RFC 4340, 19.5) */
23#define CCID_MAX 255
24#define CCID_SLAB_NAME_LENGTH 32
7c657876 25
14c85021
ACM		 26struct tcp_info;
27
9cb2345a
GR		 28/**
29 * struct ccid_operations - Interface to Congestion-Control Infrastructure
30 *
31 * @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.)
6179983a 32 * @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled)
9cb2345a 33 * @ccid_name: alphabetical identifier string for @ccid_id
9cb2345a
GR		 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
36 *
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
47 */
91f0ebf7 48struct ccid_operations {
9cb2345a 49 unsigned char ccid_id;
6179983a 50 __u32 ccid_ccmps;
9cb2345a 51 const char *ccid_name;
9cb2345a
GR		 52 struct kmem_cache *ccid_hc_rx_slab,
53 *ccid_hc_tx_slab;
8ed030dd
GR		 54 char ccid_hc_rx_slab_name[CCID_SLAB_NAME_LENGTH];
55 char ccid_hc_tx_slab_name[CCID_SLAB_NAME_LENGTH];
9cb2345a
GR		 56 __u32 ccid_hc_rx_obj_size,
57 ccid_hc_tx_obj_size;
58 /* Interface Routines */
91f0ebf7
ACM		 59 int (*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk);
60 int (*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk);
7c657876
ACM		 61 void (*ccid_hc_rx_exit)(struct sock *sk);
62 void (*ccid_hc_tx_exit)(struct sock *sk);
7690af3f
ACM		 63 void (*ccid_hc_rx_packet_recv)(struct sock *sk,
64 struct sk_buff *skb);
4874c131
GR		 65 int (*ccid_hc_rx_parse_options)(struct sock *sk, u8 pkt,
66 u8 opt, u8 *val, u8 len);
2d0817d1 67 int (*ccid_hc_rx_insert_options)(struct sock *sk,
7690af3f 68 struct sk_buff *skb);
7690af3f
ACM		 69 void (*ccid_hc_tx_packet_recv)(struct sock *sk,
70 struct sk_buff *skb);
4874c131
GR		 71 int (*ccid_hc_tx_parse_options)(struct sock *sk, u8 pkt,
72 u8 opt, u8 *val, u8 len);
7c657876 73 int (*ccid_hc_tx_send_packet)(struct sock *sk,
6b57c93d
GR		 74 struct sk_buff *skb);
75 void (*ccid_hc_tx_packet_sent)(struct sock *sk,
baf9e782 76 unsigned int len);
2babe1f6
ACM		 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);
88f964db
ACM		 81 int (*ccid_hc_rx_getsockopt)(struct sock *sk,
82 const int optname, int len,
83 u32 __user *optval,
84 int __user *optlen);
85 int (*ccid_hc_tx_getsockopt)(struct sock *sk,
86 const int optname, int len,
87 u32 __user *optval,
88 int __user *optlen);
7c657876
ACM		 89};
90
ddebc973
GR		 91extern struct ccid_operations ccid2_ops;
92#ifdef CONFIG_IP_DCCP_CCID3
93extern struct ccid_operations ccid3_ops;
94#endif
95
96extern int ccid_initialize_builtins(void);
97extern void ccid_cleanup_builtins(void);
7c657876 98
91f0ebf7
ACM		 99struct ccid {
100 struct ccid_operations *ccid_ops;
101 char ccid_priv[0];
102};
7c657876 103
91f0ebf7 104static inline void *ccid_priv(const struct ccid *ccid)
7c657876 105{
91f0ebf7 106 return (void *)ccid->ccid_priv;
7c657876
ACM		 107}
108
d90ebcbf
GR		 109extern bool ccid_support_check(u8 const *ccid_array, u8 array_len);
110extern int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len);
111extern int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
112 char __user *, int __user *);
113
e5fd56ca 114extern struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx);
91f0ebf7 115
71c262a3
GR		 116static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
117{
118 struct ccid *ccid = dp->dccps_hc_rx_ccid;
119
120 if (ccid == NULL || ccid->ccid_ops == NULL)
121 return -1;
122 return ccid->ccid_ops->ccid_id;
123}
124
125static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
126{
127 struct ccid *ccid = dp->dccps_hc_tx_ccid;
128
129 if (ccid == NULL || ccid->ccid_ops == NULL)
130 return -1;
131 return ccid->ccid_ops->ccid_id;
132}
133
91f0ebf7
ACM		 134extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
135extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
136
fe84f414
GR		 137/*
138 * Congestion control of queued data packets via CCID decision.
139 *
140 * The TX CCID performs its congestion-control by indicating whether and when a
141 * queued packet may be sent, using the return code of ccid_hc_tx_send_packet().
142 * The following modes are supported via the symbolic constants below:
143 * - timer-based pacing (CCID returns a delay value in milliseconds);
144 * - autonomous dequeueing (CCID internally schedules dccps_xmitlet).
145 */
146
147enum ccid_dequeueing_decision {
148 CCID_PACKET_SEND_AT_ONCE = 0x00000, /* "green light": no delay */
149 CCID_PACKET_DELAY_MAX = 0x0FFFF, /* maximum delay in msecs */
150 CCID_PACKET_DELAY = 0x10000, /* CCID msec-delay mode */
151 CCID_PACKET_WILL_DEQUEUE_LATER = 0x20000, /* CCID autonomous mode */
152 CCID_PACKET_ERR = 0xF0000, /* error condition */
153};
154
155static inline int ccid_packet_dequeue_eval(const int return_code)
156{
157 if (return_code < 0)
158 return CCID_PACKET_ERR;
159 if (return_code == 0)
160 return CCID_PACKET_SEND_AT_ONCE;
161 if (return_code <= CCID_PACKET_DELAY_MAX)
162 return CCID_PACKET_DELAY;
163 return return_code;
164}
165
7c657876 166static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
6b57c93d 167 struct sk_buff *skb)
7c657876 168{
91f0ebf7 169 if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
fe84f414
GR		 170 return ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
171 return CCID_PACKET_SEND_AT_ONCE;
7c657876
ACM		 172}
173
174static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
baf9e782 175 unsigned int len)
7c657876 176{
91f0ebf7 177 if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
baf9e782 178 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, len);
7c657876
ACM		 179}
180
181static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
182 struct sk_buff *skb)
183{
91f0ebf7
ACM		 184 if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
185 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
7c657876
ACM		 186}
187
188static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
189 struct sk_buff *skb)
190{
91f0ebf7
ACM		 191 if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
192 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
7c657876
ACM		 193}
194
4874c131
GR		 195/**
196 * ccid_hc_tx_parse_options - Parse CCID-specific options sent by the receiver
197 * @pkt: type of packet that @opt appears on (RFC 4340, 5.1)
198 * @opt: the CCID-specific option type (RFC 4340, 5.8 and 10.3)
199 * @val: value of @opt
200 * @len: length of @val in bytes
201 */
7c657876 202static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
4874c131 203 u8 pkt, u8 opt, u8 *val, u8 len)
7c657876 204{
4874c131
GR		 205 if (ccid->ccid_ops->ccid_hc_tx_parse_options == NULL)
206 return 0;
207 return ccid->ccid_ops->ccid_hc_tx_parse_options(sk, pkt, opt, val, len);
7c657876
ACM		 208}
209
4874c131
GR		 210/**
211 * ccid_hc_rx_parse_options - Parse CCID-specific options sent by the sender
212 * Arguments are analogous to ccid_hc_tx_parse_options()
213 */
7c657876 214static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
4874c131 215 u8 pkt, u8 opt, u8 *val, u8 len)
7c657876 216{
4874c131
GR		 217 if (ccid->ccid_ops->ccid_hc_rx_parse_options == NULL)
218 return 0;
219 return ccid->ccid_ops->ccid_hc_rx_parse_options(sk, pkt, opt, val, len);
7c657876
ACM		 220}
221
2d0817d1
ACM		 222static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
223 struct sk_buff *skb)
7c657876 224{
91f0ebf7 225 if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
2d0817d1
ACM		 226 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
227 return 0;
7c657876 228}
2babe1f6
ACM		 229
230static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
231 struct tcp_info *info)
232{
91f0ebf7
ACM		 233 if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
234 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
2babe1f6
ACM		 235}
236
237static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
238 struct tcp_info *info)
239{
91f0ebf7
ACM		 240 if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
241 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
2babe1f6 242}
88f964db
ACM		 243
244static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
245 const int optname, int len,
246 u32 __user *optval, int __user *optlen)
247{
248 int rc = -ENOPROTOOPT;
91f0ebf7
ACM		 249 if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
250 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
88f964db
ACM		 251 optval, optlen);
252 return rc;
253}
254
255static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
256 const int optname, int len,
257 u32 __user *optval, int __user *optlen)
258{
259 int rc = -ENOPROTOOPT;
91f0ebf7
ACM		 260 if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
261 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,
88f964db
ACM		 262 optval, optlen);
263 return rc;
264}
7c657876 265#endif /* _CCID_H */
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