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274 | // Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Kea Hooks Basic
// Commercial End User License Agreement v2.0. See COPYING file in the premium/
// directory.
#include <config.h>
#include <cc/data.h>
#include <dhcp/classify.h>
#include <dhcpsrv/lease.h>
#include <dhcpsrv/lease_mgr_factory.h>
#include <dhcpsrv/srv_config.h>
#include <dhcpsrv/subnet_id.h>
#include <limits/configuration.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <limits/limit_manager.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <util/dhcp_space.h>
#include <string><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
using namespace isc::data;
using namespace isc::dhcp;
using namespace isc::util;
using namespace std;
namespace isc {
namespace limits {
LimitManager&
LimitManager::instance() {
static LimitManager instance;
return (instance);
}
void
LimitManager::clear() {
clocked_in_times_by_class_.clear();
clocked_in_times_by_subnet_id_.clear();
}
void
LimitManager::initialize(SrvConfigPtr const& config) {
// Reset any packet accounting that had transpired so far.
clear();
// Parse the configuration to get the limits of interest.
parse(config);
}
void
LimitManager::addClientClassesToLeaseContext(ClientClasses const& classes, LeasePtr const& lease) {
// The ConstElementPtr - ElementPtr division forces the copies below. Changes to the lease's
// user context are not expected so shallow copy is fine as it would have been to reuse the
// original user context. Feel free to get rid of the copying. Preferable to not resort to the
// undefined behavior that is const-cast + writing data to the memory freshly made mutable.
// Get a mutable user context.
ConstElementPtr user_context_source(lease->getContext());
ElementPtr user_context;
if (user_context_source) {
user_context = copy(user_context_source, 0);
} else {
user_context = Element::createMap();
}
// Get a mutable ISC element.
ConstElementPtr ISC_source(user_context->get("ISC"));
ElementPtr ISC;
if (ISC_source) {
ISC = copy(ISC_source, 0);
} else {
ISC = Element::createMap();
user_context->set("ISC", ISC);
}
// Set the new client classes. Old ones are discarded.
ISC->set("client-classes", classes.toElement());
// Set the modified user context in the lease.
lease->setContext(user_context);
}
void
LimitManager::parse(SrvConfigPtr const& config) {
// Parse the configuration to get the limits of interest.
address_limit_configuration_.parse(config);
prefix_limit_configuration_.parse(config);
rate_limit_configuration_.parse(config);
}
template <>
ElementPtr
LimitManager::clientClassLimitsToElement<DHCPv4>(SubClassRelationContainer const& classes,
Lease::Type const& /* lease_type */) {
ElementPtr result(Element::createList());
for (auto const& c : classes) {
auto const& class_def = isc::dhcp::CfgMgr::instance().getCurrentCfg()->getClientClassDictionary()->findClass(c.class_def_);
if (!class_def) {
continue;
}
auto const& limit_cfg = address_limit_configuration_.parseUserContext(class_def->getContext());
if (limit_cfg) {
int64_t const limit_candidate(limit_cfg->intValue());
checkForLimitBoundaries<LeaseLimit>(limit_candidate);
// Get the limit.
LeaseLimit const limit(limit_candidate);
ElementPtr element(Element::createMap());
element->set("name", Element::create(c.class_));
element->set("address-limit", Element::create(limit));
result->add(element);
}
}
return (result);
}
template <>
ElementPtr
LimitManager::clientClassLimitsToElement<DHCPv6>(SubClassRelationContainer const& classes,
Lease::Type const& lease_type) {
ElementPtr result(Element::createList());
auto get_configuration = [&]() -> Configuration<LeaseLimit>& {
if (lease_type == Lease::TYPE_PD) {
return (prefix_limit_configuration_);
} else {
return (address_limit_configuration_);
}
};
auto& config = get_configuration();
for (auto const& c : classes) {
auto const& class_def = isc::dhcp::CfgMgr::instance().getCurrentCfg()->getClientClassDictionary()->findClass(c.class_def_);
if (!class_def) {
continue;
}
auto& limit_cfg = config.parseUserContext(class_def->getContext());
if (limit_cfg) {
int64_t const limit_candidate(limit_cfg->intValue());
checkForLimitBoundaries<LeaseLimit>(limit_candidate);
// Get the limit.
LeaseLimit const limit(limit_candidate);
ElementPtr element(Element::createMap());
element->set("name", Element::create(c.class_));
element->set(config.key(), Element::create(limit));
result->add(element);
}
}
return (result);
}
template <>
ElementPtr
LimitManager::subnetLimitToElement<DHCPv4>(SubnetID const subnet_id,
Lease::Type const& /* lease_type */) {
ElementPtr result(Element::createMap());
auto const& subnet_cfg = isc::dhcp::CfgMgr::instance().getCurrentCfg()->getCfgSubnets4()->getBySubnetId(subnet_id);
if (subnet_cfg) {
auto const& limit_cfg = address_limit_configuration_.parseUserContext(subnet_cfg->getContext());
if (limit_cfg) {
int64_t const limit_candidate(limit_cfg->intValue());
checkForLimitBoundaries<LeaseLimit>(limit_candidate);
// Get the limit.
LeaseLimit const limit(limit_candidate);
result->set("id", Element::create(subnet_id));
result->set("address-limit", Element::create(limit));
}
}
return (result);
}
template <>
ElementPtr
LimitManager::subnetLimitToElement<DHCPv6>(SubnetID const subnet_id,
Lease::Type const& lease_type) {
ElementPtr result(Element::createMap());
std::string limit_name;
auto get_configuration = [&]() -> Configuration<LeaseLimit>& {
if (lease_type == Lease::TYPE_PD) {
limit_name = std::string("prefix-limit");
return (prefix_limit_configuration_);
} else {
limit_name = std::string("address-limit");
return (address_limit_configuration_);
}
};
auto& config = get_configuration();
auto const& subnet_cfg = isc::dhcp::CfgMgr::instance().getCurrentCfg()->getCfgSubnets6()->getBySubnetId(subnet_id);
if (subnet_cfg) {
auto const& limit_cfg = config.parseUserContext(subnet_cfg->getContext());
if (limit_cfg) {
int64_t const limit_candidate(limit_cfg->intValue());
checkForLimitBoundaries<LeaseLimit>(limit_candidate);
// Get the limit.
LeaseLimit const limit(limit_candidate);
result->set("id", Element::create(subnet_id));
result->set(limit_name, Element::create(limit));
}
}
return (result);
}
template <>
ConstElementPtr
LimitManager::subnetRateLimit<DHCPv4>(SubnetID const subnet_id) {
ConstElementPtr limit;
auto const& subnet_cfg = isc::dhcp::CfgMgr::instance().getCurrentCfg()->getCfgSubnets4()->getBySubnetId(subnet_id);
if (subnet_cfg) {
limit = rate_limit_configuration_.parseUserContext(subnet_cfg->getContext());
}
return (limit);
}
template <>
ConstElementPtr
LimitManager::subnetRateLimit<DHCPv6>(SubnetID const subnet_id) {
ConstElementPtr limit;
auto const& subnet_cfg = isc::dhcp::CfgMgr::instance().getCurrentCfg()->getCfgSubnets6()->getBySubnetId(subnet_id);
if (subnet_cfg) {
limit = rate_limit_configuration_.parseUserContext(subnet_cfg->getContext());
}
return (limit);
}
template <>
string
LimitManager::checkLeaseLimits<DHCPv4>(ConstElementPtr const& context) const {
return (LeaseMgrFactory::instance().checkLimits4(context));
}
template <>
string
LimitManager::checkLeaseLimits<DHCPv6>(ConstElementPtr const& context) const {
return (LeaseMgrFactory::instance().checkLimits6(context));
}
template <>
void
LimitManager::recountClassLeases<DHCPv4>() const {
if (isc::dhcp::LeaseMgrFactory::instance().getType() == "memfile") {
isc::dhcp::LeaseMgrFactory::instance().recountClassLeases4();
}
}
template <>
void
LimitManager::recountClassLeases<DHCPv6>() const {
if (isc::dhcp::LeaseMgrFactory::instance().getType() == "memfile") {
isc::dhcp::LeaseMgrFactory::instance().recountClassLeases6();
}
}
} // namespace limits
} // namespace isc
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