70 lines
1.9 KiB
C
Executable File
70 lines
1.9 KiB
C
Executable File
/*
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* Definitions for the SECurity layer
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*
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* Author:
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* Robert Muchsel <muchsel@acm.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_IPSEC_H
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#define _LINUX_IPSEC_H
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#include <linux/config.h>
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#include <linux/socket.h>
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#include <net/sock.h>
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#include <linux/skbuff.h>
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/* Values for the set/getsockopt calls */
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/* These defines are compatible with NRL IPv6, however their semantics
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is different */
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#define IPSEC_LEVEL_NONE -1 /* send plaintext, accept any */
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#define IPSEC_LEVEL_DEFAULT 0 /* encrypt/authenticate if possible */
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/* the default MUST be 0, because a */
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/* socket is initialized with 0's */
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#define IPSEC_LEVEL_USE 1 /* use outbound, don't require inbound */
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#define IPSEC_LEVEL_REQUIRE 2 /* require both directions */
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#define IPSEC_LEVEL_UNIQUE 2 /* for compatibility only */
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#ifdef __KERNEL__
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/* skb bit flags set on packet input processing */
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#define RCV_SEC 0x0f /* options on receive */
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#define RCV_AUTH 0x01 /* was authenticated */
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#define RCV_CRYPT 0x02 /* was encrypted */
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#define RCV_TUNNEL 0x04 /* was tunneled */
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#define SND_SEC 0xf0 /* options on send, these are */
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#define SND_AUTH 0x10 /* currently unused */
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#define SND_CRYPT 0x20
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#define SND_TUNNEL 0x40
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/*
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* FIXME: ignores network encryption for now..
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*/
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#ifdef CONFIG_NET_SECURITY
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static __inline__ int ipsec_sk_policy(struct sock *sk, struct sk_buff *skb)
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{
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return ((sk->authentication < IPSEC_LEVEL_REQUIRE) ||
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(skb->security & RCV_AUTH)) &&
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((sk->encryption < IPSEC_LEVEL_REQUIRE) ||
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(skb->security & RCV_CRYPT));
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}
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#else
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static __inline__ int ipsec_sk_policy(struct sock *sk, struct sk_buff *skb)
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{
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return 1;
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}
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#endif /* CONFIG */
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#endif /* __KERNEL__ */
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#endif /* _LINUX_IPSEC_H */
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