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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> |
17 | #include <linux/compiler.h> |
18 | #include <linux/dccp.h> |
19 | #include <linux/list.h> |
20 | #include <linux/module.h> |
21 | |
22 | #define CCID_MAX 255 |
23 | |
24 | struct tcp_info; |
25 | |
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.) |
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 |
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 | */ |
46 | struct ccid_operations { |
47 | unsigned char ccid_id; |
48 | __u32 ccid_ccmps; |
49 | const char *ccid_name; |
50 | struct kmem_cache *ccid_hc_rx_slab, |
51 | *ccid_hc_tx_slab; |
52 | __u32 ccid_hc_rx_obj_size, |
53 | ccid_hc_tx_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, |
60 | struct sk_buff *skb); |
61 | int (*ccid_hc_rx_parse_options)(struct sock *sk, |
62 | unsigned char option, |
63 | unsigned char len, u16 idx, |
64 | unsigned char* value); |
65 | int (*ccid_hc_rx_insert_options)(struct sock *sk, |
66 | struct sk_buff *skb); |
67 | void (*ccid_hc_tx_packet_recv)(struct sock *sk, |
68 | struct sk_buff *skb); |
69 | int (*ccid_hc_tx_parse_options)(struct sock *sk, |
70 | unsigned char option, |
71 | unsigned char len, u16 idx, |
72 | unsigned char* value); |
73 | int (*ccid_hc_tx_send_packet)(struct sock *sk, |
74 | struct sk_buff *skb); |
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, |
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); |
89 | }; |
90 | |
91 | extern struct ccid_operations ccid2_ops; |
92 | #ifdef CONFIG_IP_DCCP_CCID3 |
93 | extern struct ccid_operations ccid3_ops; |
94 | #endif |
95 | |
96 | extern int ccid_initialize_builtins(void); |
97 | extern void ccid_cleanup_builtins(void); |
98 | |
99 | struct ccid { |
100 | struct ccid_operations *ccid_ops; |
101 | char ccid_priv[0]; |
102 | }; |
103 | |
104 | static inline void *ccid_priv(const struct ccid *ccid) |
105 | { |
106 | return (void *)ccid->ccid_priv; |
107 | } |
108 | |
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 *); |
113 | |
114 | extern struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx); |
115 | |
116 | static 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 | |
125 | static 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 | |
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); |
136 | |
137 | static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk, |
138 | struct sk_buff *skb) |
139 | { |
140 | int rc = 0; |
141 | if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL) |
142 | rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb); |
143 | return rc; |
144 | } |
145 | |
146 | static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk, |
147 | int more, unsigned int len) |
148 | { |
149 | if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL) |
150 | ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len); |
151 | } |
152 | |
153 | static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk, |
154 | struct sk_buff *skb) |
155 | { |
156 | if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL) |
157 | ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb); |
158 | } |
159 | |
160 | static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk, |
161 | struct sk_buff *skb) |
162 | { |
163 | if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL) |
164 | ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb); |
165 | } |
166 | |
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) |
171 | { |
172 | int rc = 0; |
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, |
175 | value); |
176 | return rc; |
177 | } |
178 | |
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) |
183 | { |
184 | int rc = 0; |
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); |
187 | return rc; |
188 | } |
189 | |
190 | static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk, |
191 | struct sk_buff *skb) |
192 | { |
193 | if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL) |
194 | return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb); |
195 | return 0; |
196 | } |
197 | |
198 | static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk, |
199 | struct tcp_info *info) |
200 | { |
201 | if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL) |
202 | ccid->ccid_ops->ccid_hc_rx_get_info(sk, info); |
203 | } |
204 | |
205 | static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk, |
206 | struct tcp_info *info) |
207 | { |
208 | if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL) |
209 | ccid->ccid_ops->ccid_hc_tx_get_info(sk, info); |
210 | } |
211 | |
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) |
215 | { |
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, |
219 | optval, optlen); |
220 | return rc; |
221 | } |
222 | |
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) |
226 | { |
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, |
230 | optval, optlen); |
231 | return rc; |
232 | } |
233 | #endif /* _CCID_H */ |
234 |
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