#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 */