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/* ip traffic selector, for libreswan
*
* Copyright (C) 2020 Andrew Cagney <cagney@gnu.org>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/lgpl-2.1.txt>.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
* License for more details.
*
*/
#ifndef IP_SELECTOR_H
#define IP_SELECTOR_H
#include "ip_address.h"
#include "ip_endpoint.h"
#include "ip_subnet.h"
#include "ip_protoport.h"
#include "ip_protocol.h"
#include "ip_range.h"
struct jambuf;
/*
* IKEv2 style traffic selectors can describe.
*
* LO_ADDRESS..HI_ADDRESS : LO_PORT..HI_PORT
*
* However, this is currently implemented using a subnet which,
* bizarrely, can describe:
*
* NETWORK_PREFIX | 0 / MASK : PORT
*
* where PORT==0 imples 0..65535, and (presumably) port can only be
* non-zero when the NETWORK_PREFIX/MASK is for a single address.
*/
/*
* Define SELECTOR_TYPE to enable a proper selector structure; expect
* everything to break.
*/
#ifdef SELECTOR_TYPE
struct {
/*
* XXX: Data structure sufficient for IKEv2?
*/
const struct ip_protocol * protocol;
ip_address lo_address, hi_address;
uint16_t lo_hport, hi_hport;
} ip_selector;
#else
#include "ip_subnet.h"
typedef ip_subnet ip_selector;
#endif
#define PRI_SELECTOR "%s"
#define pri_selector(S,B) str_selector(S, B)
void pexpect_selector(const ip_selector *s, const char *t, where_t where);
#define pselector(S) pexpect_selector(S, #S, HERE)
ip_selector selector_from_address(const ip_address *address);
ip_selector selector_from_address_protocol(const ip_address *address,
const ip_protocol *protocol);
ip_selector selector_from_address_protocol_port(const ip_address *address,
const ip_protocol *protocol,
ip_port port);
ip_selector selector_from_endpoint(const ip_endpoint *address);
ip_selector selector_from_subnet_protocol_port(const ip_subnet *subnet,
const ip_protocol *protocol,
ip_port port);
ip_selector selector_from_address_protoport(const ip_address *address,
const ip_protoport *protoport);
ip_selector selector_from_subnet_protoport(const ip_subnet *subnet,
const ip_protoport *protoport);
err_t range_to_selector(const ip_range *range,
const ip_protoport *protoport,
ip_selector *selector);
err_t numeric_to_selector(shunk_t src, const struct ip_info *afi, ip_selector *dst);
/*
* Magic values.
*
* XXX: While the headers call the all-zero address "ANY" (INADDR_ANY,
* IN6ADDR_ANY_INIT), the headers also refer to the IPv6 value as
* unspecified (for instance IN6_IS_ADDR_UNSPECIFIED()) leaving the
* term "unspecified" underspecified.
*
* Consequently an AF_UNSPEC address (i.e., uninitialized or unset),
* is identified by *_unset().
*/
extern const ip_selector unset_selector;
bool selector_is_unset(const ip_selector *selector);
/* attributes */
const struct ip_info *selector_type(const ip_selector *selector);
unsigned selector_ipproto(const ip_selector *selector);
const ip_protocol *selector_protocol(const ip_selector *selector);
ip_range selector_range(const ip_selector *selector);
ip_protoport selector_protoport(const ip_selector *selector);
ip_port selector_port(const ip_selector *selector);
/* hacks */
int selector_hport(const ip_selector *selector);
#define update_selector_hport(SELECTOR, HPORT) { (SELECTOR)->addr.hport = (HPORT); }
#define update_selector_ipproto(SELECTOR, IPPROTO) { (SELECTOR)->addr.ipproto = (IPPROTO); }
/* assuming a subnet like XFRM does */
ip_address selector_prefix(const ip_selector *selector);
unsigned selector_maskbits(const ip_selector *selector);
bool selector_contains_all_addresses(const ip_selector *selector);
bool selector_contains_one_address(const ip_selector *selector);
bool selector_contains_no_addresses(const ip_selector *selector);
bool selector_in_selector(const ip_selector *l, const ip_selector *r);
bool endpoint_in_selector(const ip_endpoint *l, const ip_selector *r);
bool address_in_selector(const ip_address *l, const ip_selector *r);
bool selector_eq(const ip_selector *l, const ip_selector *r);
/* printing */
typedef struct {
char buf[sizeof(address_buf) + 4/*"/NNN"*/ + 6/*:65535*/];
} selector_buf;
const char *str_selector(const ip_selector *selector, selector_buf *out);
size_t jam_selector(struct jambuf *buf, const ip_selector *selector);
const char *str_selector_sensitive(const ip_selector *selector, selector_buf *out);
size_t jam_selector_sensitive(struct jambuf *buf, const ip_selector *selector);
typedef struct {
char buf[sizeof(selector_buf) + sizeof("=UNKNOWN=UNKNOWN=>") + sizeof(selector_buf)];
} selectors_buf;
const char *str_selectors(const ip_selector *src, const ip_selector *dst, selectors_buf *out);
size_t jam_selectors(struct jambuf *buf, const ip_selector *src, const ip_selector *dst);
const char *str_selectors_sensitive(const ip_selector *src, const ip_selector *dst, selectors_buf *out);
size_t jam_selectors_sensitive(struct jambuf *buf, const ip_selector *src, const ip_selector *dst);
#endif
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