/*      $FreeBSD: src/sys/netinet6/scope6_var.h,v 1.4 2005/01/07 02:30:35 imp Exp $     */
/*      $KAME: scope6_var.h,v 1.4 2000/05/18 15:03:27 jinmei Exp $      */

/*-
* Copyright (C) 2000 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef _NETINET6_SCOPE6_VAR_H_
#define _NETINET6_SCOPE6_VAR_H_

#ifdef _KERNEL

/*
* IPv6 Core Protocols Implementation
* By Qing Li, Tatuya Jinmei, Keiichi Shima
*
* Some information from Chapter 2.9 (Handling Scope Zones) Figure 2.12, p.56
*
* User Space
*
*             Normal App         Statistics/Mgmt App        Routing App
*          /---------------\    /-------------------\   /------------------\
*          | sin6_scope_id |    |   embedded form   |   |  embedded form   |
*          |      only     |    | (+ sin6_scope_id) |   | or sin6_scope_id |
*          \---------------/    \-------------------/   \------------------/
*                  ^                      ^                ^          |
*                  |                      |                |          |
*            no conversion              parse            parse      embed
*                  |                   embedded        embedded      ID
*                  |                      ID              ID    (if necessary)
*                  |                      |                |          |
*                  v                      |                |          v
*          /---------------\    /-------------------\   /------------------\
* ------   |    AF_INET6   |    |        kvm        |   |     Routing      |
* Kernel   |     socket    |    |     interface     |   |     socket       |
*          \---------------/    \-------------------/   \------------------/
*             ^       |                  ^                        ^
*             |       |                  |                        |
*           clear   embed           no conversion                 |
*          embedded  ID                  |                   no conversion
*            ID       |  ----------------------------------       |
*             |       V  |                                |       v
*          /---------------\                            /--------------------\
*          |               |---- clear sin_scope_id --->| embedded form only |
*          |               |<---  set sin_scope_id  ----|                    |
*          |               |                            \--------------------/
*          | embedded form |                                      ^
*          |       +       |                                      |
*          | sin_scope_id  |                                no conversion
*          |               |                                      |
*          |               |                                      V
*          |               |                            /--------------------\
*          |               |---- clear sin_scope_id --->| embedded form only |
*          |               |<---  set sin_scope_id  ----|                    |
*          \---------------/                            \--------------------/
* --------   ^           |
* Physical   |         clear
* Network  embed ID,  embedded
*           set         ID
*        sin_scope_id    |
*            |           v
*          /---------------\
*          | 128-bit IPv6  |
*          | address       |
*          | (ID not       |
*          |  included)    |
*          \---------------/
*/


struct scope6_id {
       /*
        * 16 is correspondent to 4bit multicast scope field.
        * i.e. from interface-local to global with some
        * reserved/unassigned types.
        */
       uint32_t s6id_list[16];
};

void    scope6_init(void);
struct scope6_id *scope6_ifattach(struct ifnet *);
void    scope6_ifdetach(struct scope6_id *);
uint32_t scope6_in6_addrscope(struct in6_addr *);
uint32_t scope6_addr2default(const struct in6_addr *);
int     sa6_embedscope(struct sockaddr_in6 *, int);
int     sa6_recoverscope(struct sockaddr_in6 *);
int     in6_setzoneid(struct in6_addr *, uint32_t);
int     in6_setscope(struct in6_addr *, const struct ifnet *, u_int32_t *);
int     in6_clearscope(struct in6_addr *);
const char *in6_getscopename(const struct in6_addr *);
#endif /* _KERNEL */

#endif /* _NETINET6_SCOPE6_VAR_H_ */

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