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1 | #ifndef _ACKVEC_H |
2 | #define _ACKVEC_H | |
3 | /* | |
4 | * net/dccp/ackvec.h | |
5 | * | |
6 | * An implementation of the DCCP protocol | |
7 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@mandriva.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/compiler.h> | |
16 | #include <linux/time.h> | |
17 | #include <linux/types.h> | |
18 | ||
19 | /* Read about the ECN nonce to see why it is 253 */ | |
20 | #define DCCP_MAX_ACKVEC_LEN 253 | |
21 | ||
22 | #define DCCP_ACKVEC_STATE_RECEIVED 0 | |
23 | #define DCCP_ACKVEC_STATE_ECN_MARKED (1 << 6) | |
24 | #define DCCP_ACKVEC_STATE_NOT_RECEIVED (3 << 6) | |
25 | ||
26 | #define DCCP_ACKVEC_STATE_MASK 0xC0 /* 11000000 */ | |
27 | #define DCCP_ACKVEC_LEN_MASK 0x3F /* 00111111 */ | |
28 | ||
29 | /** struct dccp_ackvec - ack vector | |
30 | * | |
31 | * This data structure is the one defined in the DCCP draft | |
32 | * Appendix A. | |
33 | * | |
34 | * @dccpav_buf_head - circular buffer head | |
35 | * @dccpav_buf_tail - circular buffer tail | |
36 | * @dccpav_buf_ackno - ack # of the most recent packet acknowledgeable in the | |
37 | * buffer (i.e. %dccpav_buf_head) | |
38 | * @dccpav_buf_nonce - the one-bit sum of the ECN Nonces on all packets acked | |
39 | * by the buffer with State 0 | |
40 | * | |
41 | * Additionally, the HC-Receiver must keep some information about the | |
42 | * Ack Vectors it has recently sent. For each packet sent carrying an | |
43 | * Ack Vector, it remembers four variables: | |
44 | * | |
45 | * @dccpav_ack_seqno - the Sequence Number used for the packet | |
46 | * (HC-Receiver seqno) | |
47 | * @dccpav_ack_ptr - the value of buf_head at the time of acknowledgement. | |
48 | * @dccpav_ack_ackno - the Acknowledgement Number used for the packet | |
49 | * (HC-Sender seqno) | |
50 | * @dccpav_ack_nonce - the one-bit sum of the ECN Nonces for all State 0. | |
51 | * | |
52 | * @dccpav_buf_len - circular buffer length | |
53 | * @dccpav_time - the time in usecs | |
54 | * @dccpav_buf - circular buffer of acknowledgeable packets | |
55 | */ | |
56 | struct dccp_ackvec { | |
57 | unsigned int dccpav_buf_head; | |
58 | unsigned int dccpav_buf_tail; | |
59 | u64 dccpav_buf_ackno; | |
60 | u64 dccpav_ack_seqno; | |
61 | u64 dccpav_ack_ackno; | |
62 | unsigned int dccpav_ack_ptr; | |
63 | unsigned int dccpav_sent_len; | |
64 | unsigned int dccpav_vec_len; | |
65 | unsigned int dccpav_buf_len; | |
66 | struct timeval dccpav_time; | |
67 | u8 dccpav_buf_nonce; | |
68 | u8 dccpav_ack_nonce; | |
69 | u8 dccpav_buf[0]; | |
70 | }; | |
71 | ||
72 | struct sock; | |
73 | struct sk_buff; | |
74 | ||
75 | #ifdef CONFIG_IP_DCCP_ACKVEC | |
76 | extern struct dccp_ackvec *dccp_ackvec_alloc(unsigned int len, | |
77 | const unsigned int __nocast priority); | |
78 | extern void dccp_ackvec_free(struct dccp_ackvec *av); | |
79 | ||
80 | extern int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk, | |
81 | const u64 ackno, const u8 state); | |
82 | ||
83 | extern void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av, | |
84 | struct sock *sk, const u64 ackno); | |
85 | extern int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb, | |
86 | const u8 opt, const u8 *value, const u8 len); | |
87 | ||
88 | extern int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb); | |
89 | ||
90 | static inline int dccp_ackvec_pending(const struct dccp_ackvec *av) | |
91 | { | |
92 | return av->dccpav_sent_len != av->dccpav_vec_len; | |
93 | } | |
94 | #else /* CONFIG_IP_DCCP_ACKVEC */ | |
95 | static inline struct dccp_ackvec *dccp_ackvec_alloc(unsigned int len, | |
96 | const unsigned int __nocast priority) | |
97 | { | |
98 | return NULL; | |
99 | } | |
100 | ||
101 | static inline void dccp_ackvec_free(struct dccp_ackvec *av) | |
102 | { | |
103 | } | |
104 | ||
105 | static inline int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk, | |
106 | const u64 ackno, const u8 state) | |
107 | { | |
108 | return -1; | |
109 | } | |
110 | ||
111 | static inline void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av, | |
112 | struct sock *sk, const u64 ackno) | |
113 | { | |
114 | } | |
115 | ||
116 | static inline int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb, | |
117 | const u8 opt, const u8 *value, const u8 len) | |
118 | { | |
119 | return -1; | |
120 | } | |
121 | ||
122 | static inline int dccp_insert_option_ackvec(const struct sock *sk, | |
123 | const struct sk_buff *skb) | |
124 | { | |
125 | return -1; | |
126 | } | |
127 | ||
128 | static inline int dccp_ackvec_pending(const struct dccp_ackvec *av) | |
129 | { | |
130 | return 0; | |
131 | } | |
132 | #endif /* CONFIG_IP_DCCP_ACKVEC */ | |
133 | #endif /* _ACKVEC_H */ |