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#ifndef _DCCP_FEAT_H
#define _DCCP_FEAT_H
/*
* net/dccp/feat.h
*
* An implementation of the DCCP protocol
* 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"
static inline int dccp_feat_is_valid_length(u8 type, u8 feature, u8 len)
{
/* sec. 6.1: Confirm has at least length 3,
* sec. 6.2: Change has at least length 4 */
if (len < 3)
return 1;
if (len < 4 && (type == DCCPO_CHANGE_L || type == DCCPO_CHANGE_R))
return 1;
/* XXX: add per-feature length validation (sec. 6.6.8) */
return 0;
}
static inline int dccp_feat_is_reserved(const u8 feat)
{
return (feat > DCCPF_DATA_CHECKSUM &&
feat < DCCPF_MIN_CCID_SPECIFIC) ||
feat == DCCPF_RESERVED;
}
/* feature negotiation knows only these four option types (RFC 4340, sec. 6) */
static inline int dccp_feat_is_valid_type(const u8 optnum)
{
return optnum >= DCCPO_CHANGE_L && optnum <= DCCPO_CONFIRM_R;
}
#ifdef CONFIG_IP_DCCP_DEBUG
extern const char *dccp_feat_typename(const u8 type);
extern const char *dccp_feat_name(const u8 feat);
static inline void dccp_feat_debug(const u8 type, const u8 feat, const u8 val)
{
dccp_pr_debug("%s(%s (%d), %d)\n", dccp_feat_typename(type),
dccp_feat_name(feat), feat, val);
}
#else
#define dccp_feat_debug(type, feat, val)
#endif /* CONFIG_IP_DCCP_DEBUG */
extern int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
u8 *val, u8 len, gfp_t gfp);
extern int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature,
u8 *val, u8 len);
extern int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
u8 *val, u8 len);
extern void dccp_feat_clean(struct dccp_minisock *dmsk);
extern int dccp_feat_clone(struct sock *oldsk, struct sock *newsk);
extern int dccp_feat_init(struct dccp_minisock *dmsk);
#endif /* _DCCP_FEAT_H */
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