49aebc66d6
The previous setsockopt interface, which passed socket options via struct dccp_so_feat, is complicated/difficult to use. Continuing to support it leads to ugly code since the old approach did not distinguish between NN and SP values. This patch removes the old setsockopt interface and replaces it with two new functions to register NN/SP values for feature negotiation. These are essentially wrappers around the internal __feat_register functions, with checking added to avoid * wrong usage (type); * changing values while the connection is in progress. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
#ifndef _DCCP_FEAT_H
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#define _DCCP_FEAT_H
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/*
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* net/dccp/feat.h
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*
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* An implementation of the DCCP protocol
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* Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include "dccp.h"
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/*
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* Known limit values
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*/
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/* Ack Ratio takes 2-byte integer values (11.3) */
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#define DCCPF_ACK_RATIO_MAX 0xFFFF
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/* Wmin=32 and Wmax=2^46-1 from 7.5.2 */
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#define DCCPF_SEQ_WMIN 32
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#define DCCPF_SEQ_WMAX 0x3FFFFFFFFFFFull
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enum dccp_feat_type {
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FEAT_AT_RX = 1, /* located at RX side of half-connection */
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FEAT_AT_TX = 2, /* located at TX side of half-connection */
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FEAT_SP = 4, /* server-priority reconciliation (6.3.1) */
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FEAT_NN = 8, /* non-negotiable reconciliation (6.3.2) */
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FEAT_UNKNOWN = 0xFF /* not understood or invalid feature */
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};
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enum dccp_feat_state {
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FEAT_DEFAULT = 0, /* using default values from 6.4 */
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FEAT_INITIALISING, /* feature is being initialised */
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FEAT_CHANGING, /* Change sent but not confirmed yet */
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FEAT_UNSTABLE, /* local modification in state CHANGING */
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FEAT_STABLE /* both ends (think they) agree */
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};
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/**
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* dccp_feat_val - Container for SP or NN feature values
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* @nn: single NN value
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* @sp.vec: single SP value plus optional preference list
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* @sp.len: length of @sp.vec in bytes
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*/
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typedef union {
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u64 nn;
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struct {
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u8 *vec;
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u8 len;
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} sp;
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} dccp_feat_val;
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/**
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* struct feat_entry - Data structure to perform feature negotiation
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* @val: feature's current value (SP features may have preference list)
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* @state: feature's current state
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* @feat_num: one of %dccp_feature_numbers
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* @needs_mandatory: whether Mandatory options should be sent
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* @needs_confirm: whether to send a Confirm instead of a Change
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* @empty_confirm: whether to send an empty Confirm (depends on @needs_confirm)
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* @is_local: feature location (1) or feature-remote (0)
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* @node: list pointers, entries arranged in FIFO order
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*/
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struct dccp_feat_entry {
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dccp_feat_val val;
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enum dccp_feat_state state:8;
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u8 feat_num;
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bool needs_mandatory,
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needs_confirm,
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empty_confirm,
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is_local;
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struct list_head node;
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};
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static inline u8 dccp_feat_genopt(struct dccp_feat_entry *entry)
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{
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if (entry->needs_confirm)
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return entry->is_local ? DCCPO_CONFIRM_L : DCCPO_CONFIRM_R;
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return entry->is_local ? DCCPO_CHANGE_L : DCCPO_CHANGE_R;
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}
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/**
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* struct ccid_dependency - Track changes resulting from choosing a CCID
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* @dependent_feat: one of %dccp_feature_numbers
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* @is_local: local (1) or remote (0) @dependent_feat
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* @is_mandatory: whether presence of @dependent_feat is mission-critical or not
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* @val: corresponding default value for @dependent_feat (u8 is sufficient here)
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*/
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struct ccid_dependency {
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u8 dependent_feat;
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bool is_local:1,
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is_mandatory:1;
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u8 val;
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};
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#ifdef CONFIG_IP_DCCP_DEBUG
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extern const char *dccp_feat_typename(const u8 type);
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extern const char *dccp_feat_name(const u8 feat);
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static inline void dccp_feat_debug(const u8 type, const u8 feat, const u8 val)
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{
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dccp_pr_debug("%s(%s (%d), %d)\n", dccp_feat_typename(type),
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dccp_feat_name(feat), feat, val);
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}
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#else
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#define dccp_feat_debug(type, feat, val)
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#endif /* CONFIG_IP_DCCP_DEBUG */
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extern int dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local,
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u8 const *list, u8 len);
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extern int dccp_feat_register_nn(struct sock *sk, u8 feat, u64 val);
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extern int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature,
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u8 *val, u8 len);
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extern int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
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u8 *val, u8 len);
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extern void dccp_feat_clean(struct dccp_minisock *dmsk);
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extern int dccp_feat_clone(struct sock *oldsk, struct sock *newsk);
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extern int dccp_feat_clone_list(struct list_head const *, struct list_head *);
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extern int dccp_feat_init(struct sock *sk);
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#endif /* _DCCP_FEAT_H */
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