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sky2: fix transmit DMA map leakage
[deliverable/linux.git] / net / dccp / ccid.h
CommitLineData
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
22#define CCID_MAX 255
23
14c85021
ACM		 24struct tcp_info;
25
9cb2345a
GR		 26/**
27 * struct ccid_operations - Interface to Congestion-Control Infrastructure
28 *
29 * @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.)
6179983a 30 * @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled)
9cb2345a 31 * @ccid_name: alphabetical identifier string for @ccid_id
9cb2345a
GR		 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
34 *
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
45 */
91f0ebf7 46struct ccid_operations {
9cb2345a 47 unsigned char ccid_id;
6179983a 48 __u32 ccid_ccmps;
9cb2345a 49 const char *ccid_name;
9cb2345a
GR		 50 struct kmem_cache *ccid_hc_rx_slab,
51 *ccid_hc_tx_slab;
de4ef86c
NH		 52 char ccid_hc_rx_slab_name[32];
53 char ccid_hc_tx_slab_name[32];
9cb2345a
GR		 54 __u32 ccid_hc_rx_obj_size,
55 ccid_hc_tx_obj_size;
56 /* Interface Routines */
91f0ebf7
ACM		 57 int (*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk);
58 int (*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk);
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ACM		 59 void (*ccid_hc_rx_exit)(struct sock *sk);
60 void (*ccid_hc_tx_exit)(struct sock *sk);
7690af3f
ACM		 61 void (*ccid_hc_rx_packet_recv)(struct sock *sk,
62 struct sk_buff *skb);
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ACM		 63 int (*ccid_hc_rx_parse_options)(struct sock *sk,
64 unsigned char option,
65 unsigned char len, u16 idx,
66 unsigned char* value);
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);
7c657876
ACM		 71 int (*ccid_hc_tx_parse_options)(struct sock *sk,
72 unsigned char option,
73 unsigned char len, u16 idx,
74 unsigned char* value);
75 int (*ccid_hc_tx_send_packet)(struct sock *sk,
6b57c93d
GR		 76 struct sk_buff *skb);
77 void (*ccid_hc_tx_packet_sent)(struct sock *sk,
78 int more, unsigned int len);
2babe1f6
ACM		 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);
88f964db
ACM		 83 int (*ccid_hc_rx_getsockopt)(struct sock *sk,
84 const int optname, int len,
85 u32 __user *optval,
86 int __user *optlen);
87 int (*ccid_hc_tx_getsockopt)(struct sock *sk,
88 const int optname, int len,
89 u32 __user *optval,
90 int __user *optlen);
7c657876
ACM		 91};
92
ddebc973
GR		 93extern struct ccid_operations ccid2_ops;
94#ifdef CONFIG_IP_DCCP_CCID3
95extern struct ccid_operations ccid3_ops;
96#endif
97
98extern int ccid_initialize_builtins(void);
99extern void ccid_cleanup_builtins(void);
7c657876 100
91f0ebf7
ACM		 101struct ccid {
102 struct ccid_operations *ccid_ops;
103 char ccid_priv[0];
104};
7c657876 105
91f0ebf7 106static inline void *ccid_priv(const struct ccid *ccid)
7c657876 107{
91f0ebf7 108 return (void *)ccid->ccid_priv;
7c657876
ACM		 109}
110
d90ebcbf
GR		 111extern bool ccid_support_check(u8 const *ccid_array, u8 array_len);
112extern int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len);
113extern int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
114 char __user *, int __user *);
115
e5fd56ca 116extern struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx);
91f0ebf7 117
71c262a3
GR		 118static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
119{
120 struct ccid *ccid = dp->dccps_hc_rx_ccid;
121
122 if (ccid == NULL || ccid->ccid_ops == NULL)
123 return -1;
124 return ccid->ccid_ops->ccid_id;
125}
126
127static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
128{
129 struct ccid *ccid = dp->dccps_hc_tx_ccid;
130
131 if (ccid == NULL || ccid->ccid_ops == NULL)
132 return -1;
133 return ccid->ccid_ops->ccid_id;
134}
135
91f0ebf7
ACM		 136extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
137extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
138
7c657876 139static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
6b57c93d 140 struct sk_buff *skb)
7c657876
ACM		 141{
142 int rc = 0;
91f0ebf7 143 if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
6b57c93d 144 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
7c657876
ACM		 145 return rc;
146}
147
148static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
6b57c93d 149 int more, unsigned int len)
7c657876 150{
91f0ebf7
ACM		 151 if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
152 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
7c657876
ACM		 153}
154
155static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
156 struct sk_buff *skb)
157{
91f0ebf7
ACM		 158 if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
159 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
7c657876
ACM		 160}
161
162static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
163 struct sk_buff *skb)
164{
91f0ebf7
ACM		 165 if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
166 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
7c657876
ACM		 167}
168
169static 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)
173{
174 int rc = 0;
91f0ebf7
ACM		 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,
7690af3f 177 value);
7c657876
ACM		 178 return rc;
179}
180
181static 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)
185{
186 int rc = 0;
91f0ebf7
ACM		 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);
7c657876
ACM		 189 return rc;
190}
191
2d0817d1
ACM		 192static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
193 struct sk_buff *skb)
7c657876 194{
91f0ebf7 195 if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
2d0817d1
ACM		 196 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
197 return 0;
7c657876 198}
2babe1f6
ACM		 199
200static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
201 struct tcp_info *info)
202{
91f0ebf7
ACM		 203 if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
204 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
2babe1f6
ACM		 205}
206
207static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
208 struct tcp_info *info)
209{
91f0ebf7
ACM		 210 if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
211 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
2babe1f6 212}
88f964db
ACM		 213
214static 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)
217{
218 int rc = -ENOPROTOOPT;
91f0ebf7
ACM		 219 if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
220 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
88f964db
ACM		 221 optval, optlen);
222 return rc;
223}
224
225static 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)
228{
229 int rc = -ENOPROTOOPT;
91f0ebf7
ACM		 230 if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
231 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,
88f964db
ACM		 232 optval, optlen);
233 return rc;
234}
7c657876 235#endif /* _CCID_H */
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