subnetof3
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
Usage
#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);
Overview
These functions are obsolete; see ipsec_networkof(3) for their replacements.
Subnetof takes an Internet address and a subnet mask and returns the network part of the address (all in network byte order). Hostof similarly 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.