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// Copyright (C) 2014-2023 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <dhcp/iface_mgr.h>
#include <dhcp/option_custom.h>
#include <dhcpsrv/cfgmgr.h>
#include <dhcpsrv/cfg_subnets4.h>
#include <dhcpsrv/dhcpsrv_log.h>
#include <dhcpsrv/lease_mgr_factory.h>
#include <dhcpsrv/shared_network.h>
#include <dhcpsrv/subnet_id.h>
#include <asiolink/io_address.h>
#include <asiolink/addr_utilities.h>
#include <stats/stats_mgr.h>
#include <sstream>
using namespace isc::asiolink;
using namespace isc::data;
namespace isc {
namespace dhcp {
void
CfgSubnets4::add(const Subnet4Ptr& subnet) {
if (getBySubnetId(subnet->getID())) {
isc_throw(isc::dhcp::DuplicateSubnetID, "ID of the new IPv4 subnet '"
<< subnet->getID() << "' is already in use");
} else if (getByPrefix(subnet->toText())) {
/// @todo: Check that this new subnet does not cross boundaries of any
/// other already defined subnet.
isc_throw(isc::dhcp::DuplicateSubnetID, "subnet with the prefix of '"
<< subnet->toText() << "' already exists");
}
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE, DHCPSRV_CFGMGR_ADD_SUBNET4)
.arg(subnet->toText());
static_cast<void>(subnets_.insert(subnet));
}
Subnet4Ptr
CfgSubnets4::replace(const Subnet4Ptr& subnet) {
// Get the subnet with the same ID.
const SubnetID& subnet_id = subnet->getID();
auto& index = subnets_.template get<SubnetSubnetIdIndexTag>();
auto subnet_it = index.find(subnet_id);
if (subnet_it == index.end()) {
isc_throw(BadValue, "There is no IPv4 subnet with ID " <<subnet_id);
}
Subnet4Ptr old = *subnet_it;
bool ret = index.replace(subnet_it, subnet);
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE, DHCPSRV_CFGMGR_UPDATE_SUBNET4)
.arg(subnet_id).arg(ret);
if (ret) {
return (old);
} else {
return (Subnet4Ptr());
}
}
void
CfgSubnets4::del(const ConstSubnet4Ptr& subnet) {
del(subnet->getID());
}
void
CfgSubnets4::del(const SubnetID& subnet_id) {
auto& index = subnets_.get<SubnetSubnetIdIndexTag>();
auto subnet_it = index.find(subnet_id);
if (subnet_it == index.end()) {
isc_throw(BadValue, "no subnet with ID of '" << subnet_id
<< "' found");
}
Subnet4Ptr subnet = *subnet_it;
index.erase(subnet_it);
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE, DHCPSRV_CFGMGR_DEL_SUBNET4)
.arg(subnet->toText());
}
void
CfgSubnets4::merge(CfgOptionDefPtr cfg_def, CfgSharedNetworks4Ptr networks,
CfgSubnets4& other) {
auto& index_id = subnets_.get<SubnetSubnetIdIndexTag>();
auto& index_prefix = subnets_.get<SubnetPrefixIndexTag>();
// Iterate over the subnets to be merged. They will replace the existing
// subnets with the same id. All new subnets will be inserted into the
// configuration into which we're merging.
auto const& other_subnets = other.getAll();
for (auto const& other_subnet : (*other_subnets)) {
// Check if there is a subnet with the same ID.
auto subnet_id_it = index_id.find(other_subnet->getID());
if (subnet_id_it != index_id.end()) {
// Subnet found.
auto existing_subnet = *subnet_id_it;
// If the existing subnet and other subnet
// are the same instance skip it.
if (existing_subnet == other_subnet) {
continue;
}
// Updating the prefix can lead to problems... e.g. pools
// and reservations going outside range.
// @todo: check prefix change.
// We're going to replace the existing subnet with the other
// version. If it belongs to a shared network, we need
// remove it from that network.
SharedNetwork4Ptr network;
existing_subnet->getSharedNetwork(network);
if (network) {
network->del(existing_subnet->getID());
}
// Now we remove the existing subnet.
index_id.erase(subnet_id_it);
}
// Check if there is a subnet with the same prefix.
auto subnet_prefix_it = index_prefix.find(other_subnet->toText());
if (subnet_prefix_it != index_prefix.end()) {
// Subnet found.
auto existing_subnet = *subnet_prefix_it;
// Updating the id can lead to problems... e.g. reservation
// for the previous subnet ID.
// @todo: check reservations
// We're going to replace the existing subnet with the other
// version. If it belongs to a shared network, we need
// remove it from that network.
SharedNetwork4Ptr network;
existing_subnet->getSharedNetwork(network);
if (network) {
network->del(existing_subnet->getID());
}
// Now we remove the existing subnet.
index_prefix.erase(subnet_prefix_it);
}
// Create the subnet's options based on the given definitions.
other_subnet->getCfgOption()->createOptions(cfg_def);
// Create the options for pool based on the given definitions.
for (const auto& pool : other_subnet->getPoolsWritable(Lease::TYPE_V4)) {
pool->getCfgOption()->createOptions(cfg_def);
}
// Add the "other" subnet to the our collection of subnets.
static_cast<void>(subnets_.insert(other_subnet));
// If it belongs to a shared network, find the network and
// add the subnet to it
std::string network_name = other_subnet->getSharedNetworkName();
if (!network_name.empty()) {
SharedNetwork4Ptr network = networks->getByName(network_name);
if (network) {
network->add(other_subnet);
} else {
// This implies the shared-network collection we were given
// is out of sync with the subnets we were given.
isc_throw(InvalidOperation, "Cannot assign subnet ID of "
<< other_subnet->getID()
<< " to shared network: " << network_name
<< ", network does not exist");
}
}
// Instantiate the configured allocator and its state.
other_subnet->createAllocators();
}
}
ConstSubnet4Ptr
CfgSubnets4::getBySubnetId(const SubnetID& subnet_id) const {
const auto& index = subnets_.get<SubnetSubnetIdIndexTag>();
auto subnet_it = index.find(subnet_id);
return ((subnet_it != index.cend()) ? (*subnet_it) : ConstSubnet4Ptr());
}
ConstSubnet4Ptr
CfgSubnets4::getByPrefix(const std::string& subnet_text) const {
const auto& index = subnets_.get<SubnetPrefixIndexTag>();
auto subnet_it = index.find(subnet_text);
return ((subnet_it != index.cend()) ? (*subnet_it) : ConstSubnet4Ptr());
}
bool
CfgSubnets4::hasSubnetWithServerId(const asiolink::IOAddress& server_id) const {
const auto& index = subnets_.get<SubnetServerIdIndexTag>();
auto subnet_it = index.find(server_id);
return (subnet_it != index.cend());
}
SubnetSelector
CfgSubnets4::initSelector(const Pkt4Ptr& query) {
SubnetSelector selector;
selector.ciaddr_ = query->getCiaddr();
selector.giaddr_ = query->getGiaddr();
selector.local_address_ = query->getLocalAddr();
selector.remote_address_ = query->getRemoteAddr();
selector.client_classes_ = query->classes_;
selector.iface_name_ = query->getIface();
// If the link-selection sub-option is present, extract its value.
// "The link-selection sub-option is used by any DHCP relay agent
// that desires to specify a subnet/link for a DHCP client request
// that it is relaying but needs the subnet/link specification to
// be different from the IP address the DHCP server should use
// when communicating with the relay agent." (RFC 3527)
//
// Try first Relay Agent Link Selection sub-option
OptionPtr rai = query->getOption(DHO_DHCP_AGENT_OPTIONS);
if (rai) {
OptionCustomPtr rai_custom =
boost::dynamic_pointer_cast<OptionCustom>(rai);
if (rai_custom) {
// If Relay Agent Information Link Selection is ignored in the
// configuration, skip returning the related subnet selector here,
// and move on to normal subnet selection.
bool ignore_link_sel = CfgMgr::instance().getCurrentCfg()->
getIgnoreRAILinkSelection();
if (!ignore_link_sel) {
OptionPtr link_select =
rai_custom->getOption(RAI_OPTION_LINK_SELECTION);
if (link_select) {
OptionBuffer link_select_buf = link_select->getData();
if (link_select_buf.size() == sizeof(uint32_t)) {
selector.option_select_ =
IOAddress::fromBytes(AF_INET, &link_select_buf[0]);
return (selector);
}
}
}
}
}
// The query does not include a RAI option or that option does
// not contain the link-selection sub-option. Try subnet-selection
// option.
OptionPtr sbnsel = query->getOption(DHO_SUBNET_SELECTION);
if (sbnsel) {
OptionCustomPtr oc =
boost::dynamic_pointer_cast<OptionCustom>(sbnsel);
if (oc) {
selector.option_select_ = oc->readAddress();
}
}
return (selector);
}
Subnet4Ptr
CfgSubnets4::selectSubnet4o6(const SubnetSelector& selector) const {
for (auto const& subnet : subnets_) {
Cfg4o6& cfg4o6 = subnet->get4o6();
// Is this an 4o6 subnet at all?
if (!cfg4o6.enabled()) {
continue; // No? Let's try the next one.
}
// First match criteria: check if we have a prefix/len defined.
std::pair<asiolink::IOAddress, uint8_t> pref = cfg4o6.getSubnet4o6();
if (!pref.first.isV6Zero()) {
// Let's check if the IPv6 address is in range
IOAddress first = firstAddrInPrefix(pref.first, pref.second);
IOAddress last = lastAddrInPrefix(pref.first, pref.second);
if ((first <= selector.remote_address_) &&
(selector.remote_address_ <= last)) {
return (subnet);
}
}
// Second match criteria: check if the interface-id matches
if (cfg4o6.getInterfaceId() && selector.interface_id_ &&
cfg4o6.getInterfaceId()->equals(selector.interface_id_)) {
return (subnet);
}
// Third match criteria: check if the interface name matches
if (!cfg4o6.getIface4o6().empty() && !selector.iface_name_.empty()
&& cfg4o6.getIface4o6() == selector.iface_name_) {
return (subnet);
}
}
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE, DHCPSRV_SUBNET4O6_SELECT_FAILED);
// Ok, wasn't able to find any matching subnet.
return (Subnet4Ptr());
}
Subnet4Ptr
CfgSubnets4::selectSubnet(const SubnetSelector& selector) const {
// First use RAI link select sub-option or subnet select option
if (!selector.option_select_.isV4Zero()) {
return (selectSubnet(selector.option_select_,
selector.client_classes_));
} else {
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE,
DHCPSRV_SUBNET4_SELECT_NO_RAI_OPTIONS);
}
// If relayed message has been received, try to match the giaddr with the
// relay address specified for a subnet and/or shared network. It is also
// possible that the relay address will not match with any of the relay
// addresses across all subnets, but we need to verify that for all subnets
// before we can try to use the giaddr to match with the subnet prefix.
if (!selector.giaddr_.isV4Zero()) {
for (auto const& subnet : subnets_) {
// If relay information is specified for this subnet, it must match.
// Otherwise, we ignore this subnet.
if (subnet->hasRelays()) {
if (!subnet->hasRelayAddress(selector.giaddr_)) {
continue;
}
} else {
// Relay information is not specified on the subnet level,
// so let's try matching on the shared network level.
SharedNetwork4Ptr network;
subnet->getSharedNetwork(network);
if (!network || !(network->hasRelayAddress(selector.giaddr_))) {
continue;
}
}
// If a subnet meets the client class criteria return it.
if (subnet->clientSupported(selector.client_classes_)) {
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE,
DHCPSRV_CFGMGR_SUBNET4_RELAY)
.arg(subnet->toText())
.arg(selector.giaddr_.toText());
return (subnet);
}
}
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE,
DHCPSRV_SUBNET4_SELECT_BY_RELAY_ADDRESS_NO_MATCH)
.arg(selector.giaddr_.toText());
} else {
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE,
DHCPSRV_SUBNET4_SELECT_NO_RELAY_ADDRESS);
}
// If we got to this point it means that we were not able to match the
// giaddr with any of the addresses specified for subnets. Let's determine
// what address from the client's packet to use to match with the
// subnets' prefixes.
IOAddress address = IOAddress::IPV4_ZERO_ADDRESS();
// If there is a giaddr, use it for subnet selection.
if (!selector.giaddr_.isV4Zero()) {
address = selector.giaddr_;
// If it is a Renew or Rebind, use the ciaddr.
} else if (!selector.ciaddr_.isV4Zero() &&
!selector.local_address_.isV4Bcast()) {
address = selector.ciaddr_;
// If ciaddr is not specified, use the source address.
} else if (!selector.remote_address_.isV4Zero() &&
!selector.local_address_.isV4Bcast()) {
address = selector.remote_address_;
// If local interface name is known, use the local address on this
// interface.
} else if (!selector.iface_name_.empty()) {
IfacePtr iface = IfaceMgr::instance().getIface(selector.iface_name_);
// This should never happen in the real life. Hence we throw an
// exception.
if (iface == NULL) {
isc_throw(isc::BadValue, "interface " << selector.iface_name_
<< " doesn't exist and therefore it is impossible"
" to find a suitable subnet for its IPv4 address");
}
// Attempt to select subnet based on the interface name.
Subnet4Ptr subnet = selectSubnet(selector.iface_name_,
selector.client_classes_);
// If it matches - great. If not, we'll try to use a different
// selection criteria below.
if (subnet) {
return (subnet);
} else {
// Let's try to get an address from the local interface and
// try to match it to defined subnet.
iface->getAddress4(address);
}
}
// Unable to find a suitable address to use for subnet selection.
if (address.isV4Zero()) {
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE,
DHCPSRV_SUBNET4_SELECT_NO_USABLE_ADDRESS);
return (Subnet4Ptr());
}
// We have identified an address in the client's packet that can be
// used for subnet selection. Match this packet with the subnets.
return (selectSubnet(address, selector.client_classes_));
}
Subnet4Ptr
CfgSubnets4::selectSubnet(const std::string& iface,
const ClientClasses& client_classes) const {
for (auto const& subnet : subnets_) {
Subnet4Ptr subnet_selected;
// First, try subnet specific interface name.
if (!subnet->getIface(Network4::Inheritance::NONE).empty()) {
if (subnet->getIface(Network4::Inheritance::NONE) == iface) {
subnet_selected = subnet;
}
} else {
// Interface not specified for a subnet, so let's try if
// we can match with shared network specific setting of
// the interface.
SharedNetwork4Ptr network;
subnet->getSharedNetwork(network);
if (network &&
(network->getIface(Network4::Inheritance::NONE) == iface)) {
subnet_selected = subnet;
}
}
if (subnet_selected) {
// If a subnet meets the client class criteria return it.
if (subnet_selected->clientSupported(client_classes)) {
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE,
DHCPSRV_CFGMGR_SUBNET4_IFACE)
.arg(subnet->toText())
.arg(iface);
return (subnet_selected);
}
}
}
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE,
DHCPSRV_SUBNET4_SELECT_BY_INTERFACE_NO_MATCH)
.arg(iface);
// Failed to find a subnet.
return (Subnet4Ptr());
}
Subnet4Ptr
CfgSubnets4::getSubnet(const SubnetID id) const {
/// @todo: Once this code is migrated to multi-index container, use
/// an index rather than full scan.
for (auto const& subnet : subnets_) {
if (subnet->getID() == id) {
return (subnet);
}
}
return (Subnet4Ptr());
}
Subnet4Ptr
CfgSubnets4::selectSubnet(const IOAddress& address,
const ClientClasses& client_classes) const {
for (auto const& subnet : subnets_) {
// Address is in range for the subnet prefix, so return it.
if (!subnet->inRange(address)) {
continue;
}
// If a subnet meets the client class criteria return it.
if (subnet->clientSupported(client_classes)) {
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE, DHCPSRV_CFGMGR_SUBNET4_ADDR)
.arg(subnet->toText())
.arg(address.toText());
return (subnet);
}
}
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE,
DHCPSRV_SUBNET4_SELECT_BY_ADDRESS_NO_MATCH)
.arg(address.toText());
// Failed to find a subnet.
return (Subnet4Ptr());
}
SubnetIDSet
CfgSubnets4::getLinks(const IOAddress& link_addr, uint8_t& link_len) const {
SubnetIDSet links;
bool link_len_set = false;
for (auto const& subnet : subnets_) {
if (!subnet->inRange(link_addr)) {
continue;
}
uint8_t plen = subnet->get().second;
if (!link_len_set || (plen < link_len)) {
link_len_set = true;
link_len = plen;
}
links.insert(subnet->getID());
}
return (links);
}
void
CfgSubnets4::removeStatistics() {
using namespace isc::stats;
// For each v4 subnet currently configured, remove the statistic.
StatsMgr& stats_mgr = StatsMgr::instance();
for (auto const& subnet4 : subnets_) {
SubnetID subnet_id = subnet4->getID();
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
"total-addresses"));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
"assigned-addresses"));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
"cumulative-assigned-addresses"));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
"declined-addresses"));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
"reclaimed-declined-addresses"));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
"reclaimed-leases"));
for (const auto& pool : subnet4->getPools(Lease::TYPE_V4)) {
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
StatsMgr::generateName("pool", pool->getID(),
"total-addresses")));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
StatsMgr::generateName("pool", pool->getID(),
"assigned-addresses")));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
StatsMgr::generateName("pool", pool->getID(),
"cumulative-assigned-addresses")));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
StatsMgr::generateName("pool", pool->getID(),
"declined-addresses")));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
StatsMgr::generateName("pool", pool->getID(),
"reclaimed-declined-addresses")));
stats_mgr.del(StatsMgr::generateName("subnet", subnet_id,
StatsMgr::generateName("pool", pool->getID(),
"reclaimed-leases")));
}
}
}
void
CfgSubnets4::updateStatistics() {
using namespace isc::stats;
StatsMgr& stats_mgr = StatsMgr::instance();
for (auto const& subnet4 : subnets_) {
SubnetID subnet_id = subnet4->getID();
stats_mgr.setValue(StatsMgr::
generateName("subnet", subnet_id, "total-addresses"),
int64_t(subnet4->getPoolCapacity(Lease::TYPE_V4)));
const std::string& name(StatsMgr::generateName("subnet", subnet_id,
"cumulative-assigned-addresses"));
if (!stats_mgr.getObservation(name)) {
stats_mgr.setValue(name, static_cast<int64_t>(0));
}
const std::string& name_reuses(StatsMgr::generateName("subnet", subnet_id,
"v4-lease-reuses"));
if (!stats_mgr.getObservation(name_reuses)) {
stats_mgr.setValue(name_reuses, int64_t(0));
}
const std::string& name_conflicts(StatsMgr::generateName("subnet", subnet_id,
"v4-reservation-conflicts"));
if (!stats_mgr.getObservation(name_conflicts)) {
stats_mgr.setValue(name_conflicts, static_cast<int64_t>(0));
}
for (const auto& pool : subnet4->getPools(Lease::TYPE_V4)) {
const std::string& name_total(StatsMgr::generateName("subnet", subnet_id,
StatsMgr::generateName("pool", pool->getID(),
"total-addresses")));
if (!stats_mgr.getObservation(name_total)) {
stats_mgr.setValue(name_total, static_cast<int64_t>(pool->getCapacity()));
} else {
stats_mgr.addValue(name_total, static_cast<int64_t>(pool->getCapacity()));
}
const std::string& name_ca(StatsMgr::generateName("subnet", subnet_id,
StatsMgr::generateName("pool", pool->getID(),
"cumulative-assigned-addresses")));
if (!stats_mgr.getObservation(name_ca)) {
stats_mgr.setValue(name_ca, static_cast<int64_t>(0));
}
}
}
// Only recount the stats if we have subnets.
if (subnets_.begin() != subnets_.end()) {
LeaseMgrFactory::instance().recountLeaseStats4();
}
}
void
CfgSubnets4::initAllocatorsAfterConfigure() {
for (auto subnet : subnets_) {
subnet->initAllocatorsAfterConfigure();
}
}
void
CfgSubnets4::clear() {
subnets_.clear();
}
ElementPtr
CfgSubnets4::toElement() const {
ElementPtr result = Element::createList();
// Iterate subnets
for (auto const& subnet : subnets_) {
result->add(subnet->toElement());
}
return (result);
}
} // end of namespace isc::dhcp
} // end of namespace isc
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