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-.TH IPSEC_INITSUBNET 3 "12 March 2002"
-.SH NAME
-ipsec initsubnet \- initialize an ip_subnet
-.br
-ipsec addrtosubnet \- initialize a singleton ip_subnet
-.br
-ipsec subnettypeof \- get address type of an ip_subnet
-.br
-ipsec masktocount \- convert subnet mask to bit count
-.br
-ipsec networkof \- get base address of an ip_subnet
-.br
-ipsec maskof \- get subnet mask of an ip_subnet
-.SH SYNOPSIS
-.B "#include <freeswan.h>"
-.sp
-.B "const char *initsubnet(const ip_address *addr,"
-.ti +1c
-.B "int maskbits, int clash, ip_subnet *dst);"
-.br
-.B "const char *addrtosubnet(const ip_address *addr,"
-.ti +1c
-.B "ip_subnet *dst);"
-.sp
-.B "int subnettypeof(const ip_subnet *src);"
-.br
-.B "int masktocount(const ip_address *src);"
-.br
-.B "void networkof(const ip_subnet *src, ip_address *dst);"
-.br
-.B "void maskof(const ip_subnet *src, ip_address *dst);"
-.SH DESCRIPTION
-The
-.B <freeswan.h>
-library uses an internal type
-.I ip_subnet
-to contain a description of an IP subnet
-(base address plus mask).
-These functions provide basic tools for creating and examining this type.
-.PP
-.I Initsubnet
-initializes a variable
-.I *dst
-of type
-.I ip_subnet
-from a base address and
-a count of mask bits.
-The
-.I clash
-parameter specifies what to do if the base address includes
-.B 1
-bits outside the prefix specified by the mask
-(that is, in the ``host number'' part of the address):
-.RS
-.IP '0' 5
-zero out host-number bits
-.IP 'x'
-non-zero host-number bits are an error
-.RE
-.PP
-.I Initsubnet
-returns
-.B NULL
-for success and
-a pointer to a string-literal error message for failure;
-see DIAGNOSTICS.
-.PP
-.I Addrtosubnet
-initializes an
-.I ip_subnet
-variable
-.I *dst
-to a ``singleton subnet'' containing the single address
-.IR *addr .
-It returns
-.B NULL
-for success and
-a pointer to a string-literal error message for failure.
-.PP
-.I Subnettypeof
-returns the address type of a subnet,
-normally
-.B AF_INET
-or
-.BR AF_INET6 .
-(The
-.B <freeswan.h>
-header file arranges to include the necessary headers for these
-names to be known.)
-.PP
-.I Masktocount
-converts a subnet mask, expressed as an address, to a bit count
-suitable for use with
-.IR initsubnet .
-It returns
-.B \-1
-for error; see DIAGNOSTICS.
-.PP
-.I Networkof
-fills in
-.I *dst
-with the base address of subnet
-.IR src .
-.PP
-.I Maskof
-fills in
-.I *dst
-with the subnet mask of subnet
-.IR src ,
-expressed as an address.
-.SH SEE ALSO
-inet(3), ipsec_ttosubnet(3), ipsec_rangetosubnet(3)
-.SH DIAGNOSTICS
-Fatal errors in
-.I initsubnet
-are:
-unknown address family;
-unknown
-.I clash
-value;
-impossible mask bit count;
-non-zero host-number bits and
-.I clash
-is
-.BR 'x' .
-Fatal errors in
-.I addrtosubnet
-are:
-unknown address family.
-Fatal errors in
-.I masktocount
-are:
-unknown address family;
-mask bits not contiguous.
-.SH HISTORY
-Written for the FreeS/WAN project by Henry Spencer.