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IPSEC_GOODMASKSection: C Library Functions (3)Updated: 13 Oct 1998 Index Return to Main Contents NAMEipsec 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); DESCRIPTIONGoodmask 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. SEE ALSOinet(3), ipsec_atosubnet(3)DIAGNOSTICSMasktobits returns -1 for an invalid mask. Bitstomask returns an all-zeros mask for a negative or out-of-range n.HISTORYWritten for the FreeS/WAN project by Henry Spencer.BUGSThe error-reporting convention of bitstomask is less than ideal; zero is sometimes a legitimate mask.
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