xref: /openbmc/linux/net/dccp/ccid.h (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 struct ccid_operations {
27 	unsigned char	ccid_id;
28 	const char	*ccid_name;
29 	struct module	*ccid_owner;
30 	struct kmem_cache	*ccid_hc_rx_slab;
31 	__u32		ccid_hc_rx_obj_size;
32 	struct kmem_cache	*ccid_hc_tx_slab;
33 	__u32		ccid_hc_tx_obj_size;
34 	int		(*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk);
35 	int		(*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk);
36 	void		(*ccid_hc_rx_exit)(struct sock *sk);
37 	void		(*ccid_hc_tx_exit)(struct sock *sk);
38 	void		(*ccid_hc_rx_packet_recv)(struct sock *sk,
39 						  struct sk_buff *skb);
40 	int		(*ccid_hc_rx_parse_options)(struct sock *sk,
41 						    unsigned char option,
42 						    unsigned char len, u16 idx,
43 						    unsigned char* value);
44 	int		(*ccid_hc_rx_insert_options)(struct sock *sk,
45 						     struct sk_buff *skb);
46 	void		(*ccid_hc_tx_packet_recv)(struct sock *sk,
47 						  struct sk_buff *skb);
48 	int		(*ccid_hc_tx_parse_options)(struct sock *sk,
49 						    unsigned char option,
50 						    unsigned char len, u16 idx,
51 						    unsigned char* value);
52 	int		(*ccid_hc_tx_send_packet)(struct sock *sk,
53 						  struct sk_buff *skb);
54 	void		(*ccid_hc_tx_packet_sent)(struct sock *sk,
55 						  int more, unsigned int len);
56 	void		(*ccid_hc_rx_get_info)(struct sock *sk,
57 					       struct tcp_info *info);
58 	void		(*ccid_hc_tx_get_info)(struct sock *sk,
59 					       struct tcp_info *info);
60 	int		(*ccid_hc_rx_getsockopt)(struct sock *sk,
61 						 const int optname, int len,
62 						 u32 __user *optval,
63 						 int __user *optlen);
64 	int		(*ccid_hc_tx_getsockopt)(struct sock *sk,
65 						 const int optname, int len,
66 						 u32 __user *optval,
67 						 int __user *optlen);
68 };
69 
70 extern int ccid_register(struct ccid_operations *ccid_ops);
71 extern int ccid_unregister(struct ccid_operations *ccid_ops);
72 
73 struct ccid {
74 	struct ccid_operations *ccid_ops;
75 	char		       ccid_priv[0];
76 };
77 
78 static inline void *ccid_priv(const struct ccid *ccid)
79 {
80 	return (void *)ccid->ccid_priv;
81 }
82 
83 extern struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx,
84 			     gfp_t gfp);
85 
86 extern struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk,
87 				   gfp_t gfp);
88 extern struct ccid *ccid_hc_tx_new(unsigned char id, struct sock *sk,
89 				   gfp_t gfp);
90 
91 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
92 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
93 
94 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
95 					 struct sk_buff *skb)
96 {
97 	int rc = 0;
98 	if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
99 		rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
100 	return rc;
101 }
102 
103 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
104 					  int more, unsigned int len)
105 {
106 	if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
107 		ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
108 }
109 
110 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
111 					  struct sk_buff *skb)
112 {
113 	if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
114 		ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
115 }
116 
117 static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
118 					  struct sk_buff *skb)
119 {
120 	if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
121 		ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
122 }
123 
124 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
125 					   unsigned char option,
126 					   unsigned char len, u16 idx,
127 					   unsigned char* value)
128 {
129 	int rc = 0;
130 	if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
131 		rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
132 						    value);
133 	return rc;
134 }
135 
136 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
137 					   unsigned char option,
138 					   unsigned char len, u16 idx,
139 					   unsigned char* value)
140 {
141 	int rc = 0;
142 	if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
143 		rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
144 	return rc;
145 }
146 
147 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
148 					    struct sk_buff *skb)
149 {
150 	if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
151 		return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
152 	return 0;
153 }
154 
155 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
156 				       struct tcp_info *info)
157 {
158 	if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
159 		ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
160 }
161 
162 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
163 				       struct tcp_info *info)
164 {
165 	if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
166 		ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
167 }
168 
169 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
170 					const int optname, int len,
171 					u32 __user *optval, int __user *optlen)
172 {
173 	int rc = -ENOPROTOOPT;
174 	if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
175 		rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
176 						 optval, optlen);
177 	return rc;
178 }
179 
180 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
181 					const int optname, int len,
182 					u32 __user *optval, int __user *optlen)
183 {
184 	int rc = -ENOPROTOOPT;
185 	if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
186 		rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,
187 						 optval, optlen);
188 	return rc;
189 }
190 #endif /* _CCID_H */
191