Проект OpenNet: MAN ipsec_goodmask (3) Библиотечные вызовы (FreeBSD и Linux)

Интерактивная система просмотра системных руководств (man-ов)

ipsec_goodmask (3)

>> ipsec_goodmask (3) ( Разные man: Библиотечные вызовы )

NAME

ipsec goodmask - is this Internet subnet mask a valid one?



ipsec masktobits - convert Internet subnet mask to bit count



ipsec bitstomask - convert bit count to Internet subnet mask

SYNOPSIS

#include <freeswan.h>

int goodmask(struct in_addr mask);
int masktobits(struct in_addr mask);
struct in_addr bitstomask(int n);

DESCRIPTION

These functions are obsolete; see ipsec_masktocount(3) for a partial replacement.

Goodmask reports whether the subnet mask is a valid one, i.e. consists of a (possibly empty) sequence of 1s followed by a (possibly empty) sequence of 0s. Masktobits takes a (valid) subnet mask and returns the number of 1 bits in it. Bitstomask reverses this, returning the subnet mask corresponding to bit count n.

All masks are in network byte order.