67 lines
2.0 KiB
C
67 lines
2.0 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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static inline int dccp_feat_is_valid_length(u8 type, u8 feature, u8 len)
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{
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/* sec. 6.1: Confirm has at least length 3,
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* sec. 6.2: Change has at least length 4 */
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if (len < 3)
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return 1;
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if (len < 4 && (type == DCCPO_CHANGE_L || type == DCCPO_CHANGE_R))
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return 1;
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/* XXX: add per-feature length validation (sec. 6.6.8) */
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return 0;
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}
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static inline int dccp_feat_is_reserved(const u8 feat)
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{
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return (feat > DCCPF_DATA_CHECKSUM &&
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feat < DCCPF_MIN_CCID_SPECIFIC) ||
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feat == DCCPF_RESERVED;
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}
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/* feature negotiation knows only these four option types (RFC 4340, sec. 6) */
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static inline int dccp_feat_is_valid_type(const u8 optnum)
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{
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return optnum >= DCCPO_CHANGE_L && optnum <= DCCPO_CONFIRM_R;
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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_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
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u8 *val, u8 len, gfp_t gfp);
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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_init(struct dccp_minisock *dmsk);
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#endif /* _DCCP_FEAT_H */
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