158 lines
4.5 KiB
C
158 lines
4.5 KiB
C
/*
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******************************************************************************
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* SOURCE FILE
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*
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* Document no: @(#) $Name: VXWORKS_ITER40_2019102207 $ $RCSfile: ipcom_mask.c,v $ $Revision: 1.2 $
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* $Source: /home/interpeak/CVSRoot/ipcom/src/ipcom_mask.c,v $
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* $Author: lob $ $Date: 2004-11-09 17:29:43 $
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* $State: Exp $ $Locker: $
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*
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* INTERPEAK_COPYRIGHT_STRING
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* Design and implementation by Lennart Bang <lob@interpeak.se>
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******************************************************************************
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*/
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/*
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****************************************************************************
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* 1 DESCRIPTION
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****************************************************************************
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*/
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/*
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****************************************************************************
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* 2 CONFIGURATION
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****************************************************************************
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*/
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#include "ipcom_config.h"
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/*
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****************************************************************************
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* 3 INCLUDE FILES
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****************************************************************************
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*/
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#define IPCOM_USE_CLIB_PROTO
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#include "ipcom_inet.h"
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#include "ipcom_sock.h"
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#include "ipcom_clib.h"
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/*
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****************************************************************************
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* 4 EXTERN PROTOTYPES
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****************************************************************************
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*/
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/*
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****************************************************************************
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* 5 DEFINES
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****************************************************************************
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*/
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/*
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****************************************************************************
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* 6 TYPES
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****************************************************************************
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*/
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/*
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****************************************************************************
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* 7 LOCAL PROTOTYPES
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****************************************************************************
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*/
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/*
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****************************************************************************
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* 8 DATA
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****************************************************************************
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*/
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/*
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****************************************************************************
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* 9 FUNCTIONS
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****************************************************************************
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*/
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/*
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*===========================================================================
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* ipcom_mask_to_prefixlen
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*===========================================================================
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* Description: Converts binary representation of a mask to the corresponding
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* prefix len value (i.e. 255.255.0.0 -> 16).
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* Parameters: mask - The mask in binary form
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* mask_bit_len - The size of the mask in bits
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* Returns: The prefix length value for the specified mask.
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*
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*/
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IP_PUBLIC int
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ipcom_mask_to_prefixlen(IP_CONST void *mask, int mask_bit_len)
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{
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int prefix_len;
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IP_CONST Ip_u8 *bm;
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Ip_u8 b;
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int i;
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bm = (IP_CONST Ip_u8 *) mask;
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for (prefix_len = 0; bm && (prefix_len < mask_bit_len); prefix_len += 8)
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{
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b = bm[prefix_len >> 3];
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if (b != 0xff)
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{
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for (i = 0; (0x80 >> i) & b; i++)
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prefix_len++;
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return prefix_len;
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}
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}
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return mask_bit_len;
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}
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/*
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*===========================================================================
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* ipcom_sockaddr_to_prefixlen
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*===========================================================================
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* Description: Returns the number of leading '1' in the mask.
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* Parameters: sa - The mask.
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* Returns:
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*
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*/
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IP_PUBLIC int
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ipcom_sockaddr_to_prefixlen(struct Ip_sockaddr *sa)
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{
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int af;
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af = sa->sa_family;
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#ifdef IPCOM_USE_INET
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if (af == IP_AF_INET)
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{
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return ipcom_mask_to_prefixlen(
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&((struct Ip_sockaddr_in *) sa)->sin_addr,
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sizeof(struct Ip_in_addr) * 8);
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}
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#endif /* IPCOM_USE_INET */
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#ifdef IPCOM_USE_INET6
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if (af == IP_AF_INET6)
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{
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return ipcom_mask_to_prefixlen(
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&((struct Ip_sockaddr_in6 *) sa)->sin6_addr,
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sizeof(struct Ip_in6_addr) * 8);
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}
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#endif /* IPCOM_USE_INET6 */
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IP_PANIC2();
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return -IP_ERRNO_EAFNOSUPPORT;
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}
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/*
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****************************************************************************
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* END OF FILE
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****************************************************************************
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*/
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