projects / deliverable / linux.git / blame
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| afe00251 AB |
1 | #ifndef _DCCP_FEAT_H |
| 2 | #define _DCCP_FEAT_H | |
| 3 | /* | |
| 4 | * net/dccp/feat.h | |
| 5 | * | |
| 6 | * An implementation of the DCCP protocol | |
| 7 | * Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk> | |
| 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/types.h> | |
| c02fdc0e | 15 | #include "dccp.h" |
| afe00251 | 16 | |
| 86349c8d GR |
17 | /* |
| 18 | * Known limit values | |
| 19 | */ | |
| 20 | /* Ack Ratio takes 2-byte integer values (11.3) */ | |
| 21 | #define DCCPF_ACK_RATIO_MAX 0xFFFF | |
| 22 | /* Wmin=32 and Wmax=2^46-1 from 7.5.2 */ | |
| 23 | #define DCCPF_SEQ_WMIN 32 | |
| 24 | #define DCCPF_SEQ_WMAX 0x3FFFFFFFFFFFull | |
| 25 | ||
| 5c7c9451 GR |
26 | enum dccp_feat_type { |
| 27 | FEAT_AT_RX = 1, /* located at RX side of half-connection */ | |
| 28 | FEAT_AT_TX = 2, /* located at TX side of half-connection */ | |
| 29 | FEAT_SP = 4, /* server-priority reconciliation (6.3.1) */ | |
| 30 | FEAT_NN = 8, /* non-negotiable reconciliation (6.3.2) */ | |
| 31 | FEAT_UNKNOWN = 0xFF /* not understood or invalid feature */ | |
| 32 | }; | |
| 33 | ||
| 34 | enum dccp_feat_state { | |
| 35 | FEAT_DEFAULT = 0, /* using default values from 6.4 */ | |
| 36 | FEAT_INITIALISING, /* feature is being initialised */ | |
| 37 | FEAT_CHANGING, /* Change sent but not confirmed yet */ | |
| 38 | FEAT_UNSTABLE, /* local modification in state CHANGING */ | |
| 39 | FEAT_STABLE /* both ends (think they) agree */ | |
| 40 | }; | |
| 41 | ||
| 42 | /** | |
| 43 | * dccp_feat_val - Container for SP or NN feature values | |
| 44 | * @nn: single NN value | |
| 45 | * @sp.vec: single SP value plus optional preference list | |
| 46 | * @sp.len: length of @sp.vec in bytes | |
| 47 | */ | |
| 48 | typedef union { | |
| 49 | u64 nn; | |
| 50 | struct { | |
| 51 | u8 *vec; | |
| 52 | u8 len; | |
| 53 | } sp; | |
| 54 | } dccp_feat_val; | |
| 55 | ||
| 56 | /** | |
| 57 | * struct feat_entry - Data structure to perform feature negotiation | |
| 58 | * @feat_num: one of %dccp_feature_numbers | |
| 59 | * @val: feature's current value (SP features may have preference list) | |
| 60 | * @state: feature's current state | |
| 61 | * @needs_mandatory: whether Mandatory options should be sent | |
| 62 | * @needs_confirm: whether to send a Confirm instead of a Change | |
| 63 | * @empty_confirm: whether to send an empty Confirm (depends on @needs_confirm) | |
| 64 | * @is_local: feature location (1) or feature-remote (0) | |
| 65 | * @node: list pointers, entries arranged in FIFO order | |
| 66 | */ | |
| 67 | struct dccp_feat_entry { | |
| 68 | u8 feat_num; | |
| 69 | dccp_feat_val val; | |
| 70 | enum dccp_feat_state state:8; | |
| 71 | bool needs_mandatory:1, | |
| 72 | needs_confirm:1, | |
| 73 | empty_confirm:1, | |
| 74 | is_local:1; | |
| 75 | ||
| 76 | struct list_head node; | |
| 77 | }; | |
| 78 | ||
| 79 | static inline u8 dccp_feat_genopt(struct dccp_feat_entry *entry) | |
| 80 | { | |
| 81 | if (entry->needs_confirm) | |
| 82 | return entry->is_local ? DCCPO_CONFIRM_L : DCCPO_CONFIRM_R; | |
| 83 | return entry->is_local ? DCCPO_CHANGE_L : DCCPO_CHANGE_R; | |
| 84 | } | |
| 85 | ||
| 86349c8d GR |
86 | /** |
| 87 | * struct ccid_dependency - Track changes resulting from choosing a CCID | |
| 88 | * @dependent_feat: one of %dccp_feature_numbers | |
| 89 | * @is_local: local (1) or remote (0) @dependent_feat | |
| 90 | * @is_mandatory: whether presence of @dependent_feat is mission-critical or not | |
| 91 | * @val: corresponding default value for @dependent_feat (u8 is sufficient here) | |
| 92 | */ | |
| 93 | struct ccid_dependency { | |
| 94 | u8 dependent_feat; | |
| 95 | bool is_local:1, | |
| 96 | is_mandatory:1; | |
| 97 | u8 val; | |
| 98 | }; | |
| 99 | ||
| c02fdc0e GR |
100 | #ifdef CONFIG_IP_DCCP_DEBUG |
| 101 | extern const char *dccp_feat_typename(const u8 type); | |
| 102 | extern const char *dccp_feat_name(const u8 feat); | |
| 103 | ||
| 104 | static inline void dccp_feat_debug(const u8 type, const u8 feat, const u8 val) | |
| 105 | { | |
| 106 | dccp_pr_debug("%s(%s (%d), %d)\n", dccp_feat_typename(type), | |
| 107 | dccp_feat_name(feat), feat, val); | |
| 108 | } | |
| 109 | #else | |
| 110 | #define dccp_feat_debug(type, feat, val) | |
| 111 | #endif /* CONFIG_IP_DCCP_DEBUG */ | |
| afe00251 | 112 | |
| 668144f7 GR |
113 | extern int dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local, |
| 114 | u8 const *list, u8 len); | |
| 115 | extern int dccp_feat_register_nn(struct sock *sk, u8 feat, u64 val); | |
| afe00251 AB |
116 | extern int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature, |
| 117 | u8 *val, u8 len); | |
| 118 | extern int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature, | |
| 119 | u8 *val, u8 len); | |
| 8ca0d17b | 120 | extern void dccp_feat_clean(struct dccp_minisock *dmsk); |
| afe00251 | 121 | extern int dccp_feat_clone(struct sock *oldsk, struct sock *newsk); |
| 828755ce | 122 | extern int dccp_feat_clone_list(struct list_head const *, struct list_head *); |
| 86349c8d | 123 | extern int dccp_feat_init(struct sock *sk); |
| afe00251 AB |
124 | |
| 125 | #endif /* _DCCP_FEAT_H */ |