1 #ifndef _DCCP_FEAT_H 2 #define _DCCP_FEAT_H 3 /* 4 * net/dccp/feat.h 5 * 6 * An implementation of the DCCP protocol 7 * Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/types.h> 15 #include "dccp.h" 16 17 static inline int dccp_feat_is_valid_length(u8 type, u8 feature, u8 len) 18 { 19 /* sec. 6.1: Confirm has at least length 3, 20 * sec. 6.2: Change has at least length 4 */ 21 if (len < 3) 22 return 1; 23 if (len < 4 && (type == DCCPO_CHANGE_L || type == DCCPO_CHANGE_R)) 24 return 1; 25 /* XXX: add per-feature length validation (sec. 6.6.8) */ 26 return 0; 27 } 28 29 static inline int dccp_feat_is_reserved(const u8 feat) 30 { 31 return (feat > DCCPF_DATA_CHECKSUM && 32 feat < DCCPF_MIN_CCID_SPECIFIC) || 33 feat == DCCPF_RESERVED; 34 } 35 36 /* feature negotiation knows only these four option types (RFC 4340, sec. 6) */ 37 static inline int dccp_feat_is_valid_type(const u8 optnum) 38 { 39 return optnum >= DCCPO_CHANGE_L && optnum <= DCCPO_CONFIRM_R; 40 41 } 42 43 #ifdef CONFIG_IP_DCCP_DEBUG 44 extern const char *dccp_feat_typename(const u8 type); 45 extern const char *dccp_feat_name(const u8 feat); 46 47 static inline void dccp_feat_debug(const u8 type, const u8 feat, const u8 val) 48 { 49 dccp_pr_debug("%s(%s (%d), %d)\n", dccp_feat_typename(type), 50 dccp_feat_name(feat), feat, val); 51 } 52 #else 53 #define dccp_feat_debug(type, feat, val) 54 #endif /* CONFIG_IP_DCCP_DEBUG */ 55 56 extern int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature, 57 u8 *val, u8 len, gfp_t gfp); 58 extern int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature, 59 u8 *val, u8 len); 60 extern int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature, 61 u8 *val, u8 len); 62 extern void dccp_feat_clean(struct dccp_minisock *dmsk); 63 extern int dccp_feat_clone(struct sock *oldsk, struct sock *newsk); 64 extern int dccp_feat_init(struct dccp_minisock *dmsk); 65 66 #endif /* _DCCP_FEAT_H */ 67