#ifndef _DCCP_FEAT_H
#define _DCCP_FEAT_H
/*
* net/dccp/feat.h
*
* Feature negotiation for the DCCP protocol (RFC 4340, section 6)
* Copyright (c) 2008 Gerrit Renker <gerrit@erg.abdn.ac.uk>
* Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/types.h>
#include "dccp.h"
/*
* Known limit values
*/
/* Ack Ratio takes 2-byte integer values (11.3) */
#define DCCPF_ACK_RATIO_MAX 0xFFFF
/* Wmin=32 and Wmax=2^46-1 from 7.5.2 */
#define DCCPF_SEQ_WMIN 32
#define DCCPF_SEQ_WMAX 0x3FFFFFFFFFFFull
/* Maximum number of SP values that fit in a single (Confirm) option */
#define DCCP_FEAT_MAX_SP_VALS (DCCP_SINGLE_OPT_MAXLEN - 2)
enum dccp_feat_type {
FEAT_AT_RX = 1, /* located at RX side of half-connection */
FEAT_AT_TX = 2, /* located at TX side of half-connection */
FEAT_SP = 4, /* server-priority reconciliation (6.3.1) */
FEAT_NN = 8, /* non-negotiable reconciliation (6.3.2) */
FEAT_UNKNOWN = 0xFF /* not understood or invalid feature */
};
enum dccp_feat_state {
FEAT_DEFAULT = 0, /* using default values from 6.4 */
FEAT_INITIALISING, /* feature is being initialised */
FEAT_CHANGING, /* Change sent but not confirmed yet */
FEAT_UNSTABLE, /* local modification in state CHANGING */
FEAT_STABLE /* both ends (think they) agree */
};
/**
* dccp_feat_val - Container for SP or NN feature values
* @nn: single NN value
* @sp.vec: single SP value plus optional preference list
* @sp.len: length of @sp.vec in bytes
*/
typedef union {
u64 nn;
struct {
u8 *vec;
u8 len;
} sp;
} dccp_feat_val;
/**
* struct feat_entry - Data structure to perform feature negotiation
* @val: feature's current value (SP features may have preference list)
* @state: feature's current state
* @feat_num: one of %dccp_feature_numbers
* @needs_mandatory: whether Mandatory options should be sent
* @needs_confirm: whether to send a Confirm instead of a Change
* @empty_confirm: whether to send an empty Confirm (depends on @needs_confirm)
* @is_local: feature location (1) or feature-remote (0)
* @node: list pointers, entries arranged in FIFO order
*/
struct dccp_feat_entry {
dccp_feat_val val;
enum dccp_feat_state state:8;
u8 feat_num;
bool needs_mandatory,
needs_confirm,
empty_confirm,
is_local;
struct list_head node;
};
static inline u8 dccp_feat_genopt(struct dccp_feat_entry *entry)
{
if (entry->needs_confirm)
return entry->is_local ? DCCPO_CONFIRM_L : DCCPO_CONFIRM_R;
return entry->is_local ? DCCPO_CHANGE_L : DCCPO_CHANGE_R;
}
/**
* struct ccid_dependency - Track changes resulting from choosing a CCID
* @dependent_feat: one of %dccp_feature_numbers
* @is_local: local (1) or remote (0) @dependent_feat
* @is_mandatory: whether presence of @dependent_feat is mission-critical or not
* @val: corresponding default value for @dependent_feat (u8 is sufficient here)
*/
struct ccid_dependency {
u8 dependent_feat;
bool is_local:1,
is_mandatory:1;
u8 val;
};
/*
* Sysctls to seed defaults for feature negotiation
*/
extern unsigned long sysctl_dccp_sequence_window;
extern int sysctl_dccp_rx_ccid;
extern int sysctl_dccp_tx_ccid;
extern int dccp_feat_init(struct sock *sk);
extern void dccp_feat_initialise_sysctls(void);
extern int dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local,
u8 const *list, u8 len);
extern int dccp_feat_parse_options(struct sock *, struct dccp_request_sock *,
u8 mand, u8 opt, u8 feat, u8 *val, u8 len);
extern int dccp_feat_clone_list(struct list_head const *, struct list_head *);
/*
* Encoding variable-length options and their maximum length.
*
* This affects NN options (SP options are all u8) and other variable-length
* options (see table 3 in RFC 4340). The limit is currently given the Sequence
* Window NN value (sec. 7.5.2) and the NDP count (sec. 7.7) option, all other
* options consume less than 6 bytes (timestamps are 4 bytes).
* When updating this constant (e.g. due to new internet drafts / RFCs), make
* sure that you also update all code which refers to it.
*/
#define DCCP_OPTVAL_MAXLEN 6
extern void dccp_encode_value_var(const u64 value, u8 *to, const u8 len);
extern u64 dccp_decode_value_var(const u8 *bf, const u8 len);
extern int dccp_insert_option_mandatory(struct sk_buff *skb);
extern int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat,
u8 *val, u8 len, bool repeat_first);
#endif /* _DCCP_FEAT_H */
