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NAME

ipsec initsubnet - initialize an ip_subnet



ipsec addrtosubnet - initialize a singleton ip_subnet



ipsec subnettypeof - get address type of an ip_subnet



ipsec masktocount - convert subnet mask to bit count



ipsec networkof - get base address of an ip_subnet



ipsec maskof - get subnet mask of an ip_subnet
 

SYNOPSIS

const char *initsubnet(const ip_address *addr,
  int maskbits, int clash, ip_subnet *dst);
const char *addrtosubnet(const ip_address *addr,
  ip_subnet *dst);

int subnettypeof(const ip_subnet *src);
int masktocount(const ip_address *src);
void networkof(const ip_subnet *src, ip_address *dst);
void maskof(const ip_subnet *src, ip_address *dst);  

DESCRIPTION

Initsubnet initializes a variable *dst of type ip_subnet from a base address and a count of mask bits. The clash parameter specifies what to do if the base address includes 1 bits outside the prefix specified by the mask (that is, in the ``host number'' part of the address):

'0'

zero out host-number bits

'x'

non-zero host-number bits are an error

Initsubnet returns NULL for success and a pointer to a string-literal error message for failure; see DIAGNOSTICS.

Addrtosubnet initializes an ip_subnet variable *dst to a ``singleton subnet'' containing the single address *addr. It returns NULL for success and a pointer to a string-literal error message for failure.

Subnettypeof returns the address type of a subnet, normally AF_INET or AF_INET6. (The <freeswan.h> header file arranges to include the necessary headers for these names to be known.)

Masktocount converts a subnet mask, expressed as an address, to a bit count suitable for use with initsubnet. It returns -1 for error; see DIAGNOSTICS.

Networkof fills in *dst with the base address of subnet src.

Maskof fills in *dst with the subnet mask of subnet src, expressed as an address.  

SEE ALSO

DIAGNOSTICS

HISTORY

Index

NAME

SYNOPSIS

DESCRIPTION

SEE ALSO

DIAGNOSTICS

HISTORY

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