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Diffstat (limited to 'net/dccp/feat.h')
| -rw-r--r-- | net/dccp/feat.h | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/net/dccp/feat.h b/net/dccp/feat.h deleted file mode 100644 index 57d9c026aa3f..000000000000 --- a/net/dccp/feat.h +++ /dev/null @@ -1,133 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ -#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> - */ -#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; - -int dccp_feat_init(struct sock *sk); -int dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local, - u8 const *list, u8 len); -int dccp_feat_parse_options(struct sock *, struct dccp_request_sock *, - u8 mand, u8 opt, u8 feat, u8 *val, u8 len); -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 - -void dccp_encode_value_var(const u64 value, u8 *to, const u8 len); -u64 dccp_decode_value_var(const u8 *bf, const u8 len); -u64 dccp_feat_nn_get(struct sock *sk, u8 feat); - -int dccp_insert_option_mandatory(struct sk_buff *skb); -int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat, u8 *val, u8 len, - bool repeat_first); -#endif /* _DCCP_FEAT_H */ |