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/* BGP Common -- header
* Copyright (C) 2009 Chris Hall (GMCH), Highwayman
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "misc.h"
#include "bgpd/bgp_common.h"
#include "lib/zassert.h"
/*==============================================================================
* Conversion qafx_bit_t -> qafx_num_t.
*
* If no bits are set, returns qafx_num_undef.
*
* If more than one bit is set, returns the lowest number qafx.
*
* NB: this is not built for speed.
*
* NB: it is a mistake to convert a value > qafx_bits_max (FATAL unless NDEBUG)
*/
extern qafx_num_t
qafx_num(qafx_bit_t bit)
{
qafx_num_t num ;
dassert(bit <= qafx_bits_max) ;
if (bit == 0)
return qafx_num_undef ;
num = 0 ;
while ((bit & 0xF) == 0)
{
num += 4 ;
bit >>= 4 ;
}
while ((bit & 1) == 0)
{
num += 1;
bit >>= 1 ;
} ;
return num ;
} ;
/*==============================================================================
* Conversion tables for qafx_num => qAFI and qSAFI
* and qafx_num => iAFI and iSAFI
* and qafx_num => pAF
*/
const qAFI_t qAFI_map[] =
{
[qafx_ipv4_unicast] = qAFI_IPV4,
[qafx_ipv4_multicast] = qAFI_IPV4,
[qafx_ipv4_mpls_vpn] = qAFI_IPV4,
[qafx_ipv6_unicast] = qAFI_IPV6,
[qafx_ipv6_multicast] = qAFI_IPV6,
[qafx_ipv6_mpls_vpn] = qAFI_IPV6,
[qafx_num_other] = qAFI_undef
} ;
const qSAFI_t qSAFI_map[] =
{
[qafx_ipv4_unicast] = qSAFI_Unicast,
[qafx_ipv4_multicast] = qSAFI_Multicast,
[qafx_ipv4_mpls_vpn] = qSAFI_MPLS_VPN,
[qafx_ipv6_unicast] = qSAFI_Unicast,
[qafx_ipv6_multicast] = qSAFI_Multicast,
[qafx_ipv6_mpls_vpn] = qSAFI_MPLS_VPN,
[qafx_num_other] = qSAFI_undef
} ;
const iAFI_t iAFI_map[] =
{
[qafx_ipv4_unicast] = iAFI_IPV4,
[qafx_ipv4_multicast] = iAFI_IPV4,
[qafx_ipv4_mpls_vpn] = iAFI_IPV4,
[qafx_ipv6_unicast] = iAFI_IPV6,
[qafx_ipv6_multicast] = iAFI_IPV6,
[qafx_ipv6_mpls_vpn] = iAFI_IPV6,
[qafx_num_other] = iAFI_Reserved
} ;
const iSAFI_t iSAFI_map[] =
{
[qafx_ipv4_unicast] = iSAFI_Unicast,
[qafx_ipv4_multicast] = iSAFI_Multicast,
[qafx_ipv4_mpls_vpn] = iSAFI_MPLS_VPN,
[qafx_ipv6_unicast] = iSAFI_Unicast,
[qafx_ipv6_multicast] = iSAFI_Multicast,
[qafx_ipv6_mpls_vpn] = iSAFI_MPLS_VPN,
[qafx_num_other] = iSAFI_Reserved,
} ;
const sa_family_t sa_family_map[] =
{
[qafx_ipv4_unicast] = AF_INET,
[qafx_ipv4_multicast] = AF_INET,
[qafx_ipv4_mpls_vpn] = AF_INET,
[qafx_ipv6_unicast] = AF_INET6,
[qafx_ipv6_multicast] = AF_INET6,
[qafx_ipv6_mpls_vpn] = AF_INET6,
[qafx_num_other] = AF_UNSPEC,
} ;
/*==============================================================================
* Convert iAFI/iSAFI => qafx_num_t -- tolerates unknown/reserved
* and qAFI/qSAFI => qafx_num_t -- tolerates undef, but not unknown
*/
/*------------------------------------------------------------------------------
* iAFI/iSAFI => qafx_num_t unknowns => qafx_num_other
* reserved => qafx_num_undef
*/
extern qafx_num_t
qafx_num_from_iAFI_iSAFI(iAFI_t afi, iSAFI_t safi)
{
switch (afi)
{
case iAFI_Reserved:
return qafx_num_undef ; /* no matter what the iSAFI is */
case iAFI_IP:
switch(safi)
{
case iSAFI_Reserved:
return qafx_num_undef ; /* no matter what the iAFI is */
case iSAFI_Unicast:
return qafx_ipv4_unicast ;
case iSAFI_Multicast:
return qafx_ipv4_multicast ;
case iSAFI_MPLS_VPN:
return qafx_ipv4_mpls_vpn ;
default:
break ;
} ;
break ;
case iAFI_IP6:
switch(safi)
{
case iSAFI_Reserved:
return qafx_num_undef ; /* no matter what the iAFI is */
case iSAFI_Unicast:
return qafx_ipv6_unicast ;
case iSAFI_Multicast:
return qafx_ipv6_multicast ;
case iSAFI_MPLS_VPN:
return qafx_ipv6_mpls_vpn ;
default:
break ;
} ;
break ;
default:
switch(safi)
{
case iSAFI_Reserved:
return qafx_num_undef ; /* no matter what the iAFI is */
default:
break ;
} ;
break ;
} ;
return qafx_num_other ;
} ;
/*------------------------------------------------------------------------------
* qAFI/qSAFI => qafx_num_t
*
* NB: qAFI_undef with any qSAFI_xxx => qafx_num_undef
* qSAFI_undef with any qAFI_xxx => qafx_num_undef
* qSAFI_Reserved_3 with any qAFI_xxx => qafx_num_undef
*
* NB: any unrecognised qAFI/qSAFI combinations => FATAL error
*/
extern qafx_num_t
qafx_num_from_qAFI_qSAFI(qAFI_t afi, qSAFI_t safi)
{
switch (afi)
{
case qAFI_undef:
if ((safi >= qSAFI_min) && (safi <= qSAFI_max))
return qafx_num_undef ; /* for all valid qSAFI */
break ;
case qAFI_IP:
switch(safi)
{
case qSAFI_undef:
case qSAFI_Reserved_3:
return qafx_num_undef ;
case qSAFI_Unicast:
return qafx_ipv4_unicast ;
case qSAFI_Multicast:
return qafx_ipv4_multicast ;
case qSAFI_MPLS_VPN:
return qafx_ipv4_mpls_vpn ;
default:
break ;
} ;
break ;
case qAFI_IP6:
switch(safi)
{
case qSAFI_undef:
case qSAFI_Reserved_3:
return qafx_num_undef ;
case qSAFI_Unicast:
return qafx_ipv6_unicast ;
case qSAFI_Multicast:
return qafx_ipv6_multicast ;
case qSAFI_MPLS_VPN:
return qafx_ipv6_mpls_vpn ;
default:
break ;
} ;
break ;
default:
break ;
} ;
zabort("invalid qAFI or qSAFI") ;
} ;
/*==============================================================================
* Convert iAFI/iSAFI => qafx_bit_t -- tolerates unknown/reserved
* and qAFI/qSAFI => qafx_bit_t -- tolerates undef, but not unknown
*/
/*------------------------------------------------------------------------------
* iAFI/iSAFI => qafx_bit_t unknowns => 0
* reserved => 0
*/
extern qafx_bit_t
qafx_bit_from_iAFI_iSAFI(iAFI_t afi, iSAFI_t safi)
{
qafx_num_t qn = qafx_num_from_iAFI_iSAFI(afi, safi) ;
if ((qn != qafx_num_undef) && (qn != qafx_num_other))
return qafx_bit(qn) ;
else
return 0 ;
} ;
/*------------------------------------------------------------------------------
* qAFI/qSAFI => qafx_bit_t
*
* NB: qAFI_undef with any qSAFI_xxx => 0
* qSAFI_undef with any qAFI_xxx => 0
* qSAFI_Unused qith any qAFI_xxx => 0
*
* NB: any unrecognised qAFI/qSAFI combinations => FATAL error
*/
extern qafx_bit_t
qafx_bit_from_qAFI_qSAFI(qAFI_t afi, qSAFI_t safi)
{
qafx_num_t qn = qafx_num_from_qAFI_qSAFI(afi, safi) ;
if ((qn != qafx_num_undef) && (qn != qafx_num_other))
return qafx_bit(qn) ;
else
return 0 ;
} ;
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