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bird/lib/ip.c
2010-04-28 00:39:57 +02:00

251 lines
6.5 KiB
C

/*
* BIRD Library -- IP address routines common for IPv4 and IPv6
*
* (c) 1998--2000 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "nest/bird.h"
#include "lib/ip.h"
/**
* DOC: IP addresses
*
* BIRD uses its own abstraction of IP address in order to share the same
* code for both IPv4 and IPv6. IP addresses are represented as entities
* of type &ip_addr which are never to be treated as numbers and instead
* they must be manipulated using the following functions and macros.
*/
/**
* ip_scope_text - get textual representation of address scope
* @scope: scope (%SCOPE_xxx)
*
* Returns a pointer to a textual name of the scope given.
*/
char *
ip_scope_text(unsigned scope)
{
static char *scope_table[] = { "host", "link", "site", "org", "univ" };
if (scope > SCOPE_UNIVERSE)
return "?";
else
return scope_table[scope];
}
#if 0
/**
* ipa_equal - compare two IP addresses for equality
* @x: IP address
* @y: IP address
*
* ipa_equal() returns 1 if @x and @y represent the same IP address, else 0.
*/
int ipa_equal(ip_addr x, ip_addr y) { DUMMY }
/**
* ipa_nonzero - test if an IP address is defined
* @x: IP address
*
* ipa_nonzero returns 1 if @x is a defined IP address (not all bits are zero),
* else 0.
*
* The undefined all-zero address is reachable as a |IPA_NONE| macro.
*/
int ipa_nonzero(ip_addr x) { DUMMY }
/**
* ipa_and - compute bitwise and of two IP addresses
* @x: IP address
* @y: IP address
*
* This function returns a bitwise and of @x and @y. It's primarily
* used for network masking.
*/
ip_addr ipa_and(ip_addr x, ip_addr y) { DUMMY }
/**
* ipa_or - compute bitwise or of two IP addresses
* @x: IP address
* @y: IP address
*
* This function returns a bitwise or of @x and @y.
*/
ip_addr ipa_or(ip_addr x, ip_addr y) { DUMMY }
/**
* ipa_xor - compute bitwise xor of two IP addresses
* @x: IP address
* @y: IP address
*
* This function returns a bitwise xor of @x and @y.
*/
ip_addr ipa_xor(ip_addr x, ip_addr y) { DUMMY }
/**
* ipa_not - compute bitwise negation of two IP addresses
* @x: IP address
*
* This function returns a bitwise negation of @x.
*/
ip_addr ipa_not(ip_addr x) { DUMMY }
/**
* ipa_mkmask - create a netmask
* @x: prefix length
*
* This function returns an &ip_addr corresponding of a netmask
* of an address prefix of size @x.
*/
ip_addr ipa_mkmask(int x) { DUMMY }
/**
* ipa_mkmask - calculate netmask length
* @x: IP address
*
* This function checks whether @x represents a valid netmask and
* returns the size of the associate network prefix or -1 for invalid
* mask.
*/
int ipa_mklen(ip_addr x) { DUMMY }
/**
* ipa_hash - hash IP addresses
* @x: IP address
*
* ipa_hash() returns a 16-bit hash value of the IP address @x.
*/
int ipa_hash(ip_addr x) { DUMMY }
/**
* ipa_hton - convert IP address to network order
* @x: IP address
*
* Converts the IP address @x to the network byte order.
*
* Beware, this is a macro and it alters the argument!
*/
void ipa_hton(ip_addr x) { DUMMY }
/**
* ipa_ntoh - convert IP address to host order
* @x: IP address
*
* Converts the IP address @x from the network byte order.
*
* Beware, this is a macro and it alters the argument!
*/
void ipa_ntoh(ip_addr x) { DUMMY }
/**
* ipa_classify - classify an IP address
* @x: IP address
*
* ipa_classify() returns an address class of @x, that is a bitwise or
* of address type (%IADDR_INVALID, %IADDR_HOST, %IADDR_BROADCAST, %IADDR_MULTICAST)
* with address scope (%SCOPE_HOST to %SCOPE_UNIVERSE) or -1 (%IADDR_INVALID)
* for an invalid address.
*/
int ipa_classify(ip_addr x) { DUMMY }
/**
* ipa_class_mask - guess netmask according to address class
* @x: IP address
*
* This function (available in IPv4 version only) returns a
* network mask according to the address class of @x. Although
* classful addressing is nowadays obsolete, there still live
* routing protocols transferring no prefix lengths nor netmasks
* and this function could be useful to them.
*/
ip_addr ipa_class_mask(ip_addr x) { DUMMY }
/**
* ipa_from_u32 - convert IPv4 address to an integer
* @x: IP address
*
* This function takes an IPv4 address and returns its numeric
* representation.
*/
u32 ipa_from_u32(ip_addr x) { DUMMY }
/**
* ipa_to_u32 - convert integer to IPv4 address
* @x: a 32-bit integer
*
* ipa_to_u32() takes a numeric representation of an IPv4 address
* and converts it to the corresponding &ip_addr.
*/
ip_addr ipa_to_u32(u32 x) { DUMMY }
/**
* ipa_compare - compare two IP addresses for order
* @x: IP address
* @y: IP address
*
* The ipa_compare() function takes two IP addresses and returns
* -1 if @x is less than @y in canonical ordering (lexicographical
* order of the bit strings), 1 if @x is greater than @y and 0
* if they are the same.
*/
int ipa_compare(ip_addr x, ip_addr y) { DUMMY }
/**
* ipa_build - build an IPv6 address from parts
* @a1: part #1
* @a2: part #2
* @a3: part #3
* @a4: part #4
*
* ipa_build() takes @a1 to @a4 and assembles them to a single IPv6
* address. It's used for example when a protocol wants to bind its
* socket to a hard-wired multicast address.
*/
ip_addr ipa_build(u32 a1, u32 a2, u32 a3, u32 a4) { DUMMY }
/**
* ipa_absolutize - convert link scope IPv6 address to universe scope
* @x: link scope IPv6 address
* @y: universe scope IPv6 prefix of the interface
*
* This function combines a link-scope IPv6 address @x with the universe
* scope prefix @x of the network assigned to an interface to get a
* universe scope form of @x.
*/
ip_addr ipa_absolutize(ip_addr x, ip_addr y) { DUMMY }
/**
* ip_ntop - convert IP address to textual representation
* @a: IP address
* @buf: buffer of size at least %STD_ADDRESS_P_LENGTH
*
* This function takes an IP address and creates its textual
* representation for presenting to the user.
*/
char *ip_ntop(ip_addr a, char *buf) { DUMMY }
/**
* ip_ntox - convert IP address to hexadecimal representation
* @a: IP address
* @buf: buffer of size at least %STD_ADDRESS_P_LENGTH
*
* This function takes an IP address and creates its hexadecimal
* textual representation. Primary use: debugging dumps.
*/
char *ip_ntox(ip_addr a, char *buf) { DUMMY }
/**
* ip_pton - parse textual representation of IP address
* @a: textual representation
* @o: where to put the resulting address
*
* This function parses a textual IP address representation and
* stores the decoded address to a variable pointed to by @o.
* Returns 0 if a parse error has occurred, else 0.
*/
int ip_pton(char *a, ip_addr *o) { DUMMY }
#endif