IPSEC_SUBNETOF(3)IPSEC_SUBNETOF(3)NAME
ipsec subnetof - given Internet address and subnet mask, return subnet
number
ipsec hostof - given Internet address and subnet mask, return host part
ipsec broadcastof - given Internet address and subnet mask, return
broadcast address
SYNOPSIS
#include <freeswan.h>
struct in_addr subnetof(struct in_addr addr,
struct in_addr mask);
struct in_addr hostof(struct in_addr addr,
struct in_addr mask);
struct in_addr broadcastof(struct in_addr addr,
struct in_addr mask);
DESCRIPTION
These functions are obsolete; see ipsec_networkof(3) for their replace‐
ments.
Subnetof takes an Internet address and a subnet mask and returns the
network part of the address (all in network byte order). Hostof simi‐
larly returns the host part, and broadcastof returns the broadcast
address (all-1s convention) for the network.
These functions are provided to hide the Internet bit-munging inside an
API, in hopes of easing the eventual transition to IPv6.
SEE ALSOinet(3), ipsec_atosubnet(3)HISTORY
Written for the FreeS/WAN project by Henry Spencer.
BUGS
Calling functions for this is more costly than doing it yourself.
11 June 2001 IPSEC_SUBNETOF(3)
