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// Copyright (C) 2015-2022 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 <util/buffer.h>
#include <dhcp/iface_mgr.h>
#include <dhcp/pkt6.h>
#include <dhcpsrv/callout_handle_store.h>
#include <dhcpsrv/cfgmgr.h>
#include <dhcp6/dhcp6to4_ipc.h>
#include <dhcp6/dhcp6_log.h>
#include <dhcp6/ctrl_dhcp6_srv.h>
#include <dhcp6/dhcp6_srv.h>
#include <exceptions/exceptions.h>
#include <hooks/callout_handle.h>
#include <hooks/hooks_log.h>
#include <hooks/hooks_manager.h>
#include <stats/stats_mgr.h>
using namespace std;
using namespace isc::hooks;
namespace isc {
namespace dhcp {
uint16_t Dhcp6to4Ipc::client_port = 0;
Dhcp6to4Ipc::Dhcp6to4Ipc() : Dhcp4o6IpcBase() {}
Dhcp6to4Ipc& Dhcp6to4Ipc::instance() {
static Dhcp6to4Ipc dhcp6to4_ipc;
return (dhcp6to4_ipc);
}
void Dhcp6to4Ipc::open() {
uint16_t port = CfgMgr::instance().getStagingCfg()->getDhcp4o6Port();
if (port == 0) {
Dhcp4o6IpcBase::close();
return;
}
if (port > 65534) {
isc_throw(OutOfRange, "DHCP4o6 port " << port);
}
int old_fd = socket_fd_;
socket_fd_ = Dhcp4o6IpcBase::open(port, ENDPOINT_TYPE_V6);
if ((old_fd == -1) && (socket_fd_ != old_fd)) {
IfaceMgr::instance().addExternalSocket(socket_fd_,
Dhcp6to4Ipc::handler);
}
}
void Dhcp6to4Ipc::handler(int /* fd */) {
Dhcp6to4Ipc& ipc = Dhcp6to4Ipc::instance();
Pkt6Ptr pkt;
try {
LOG_DEBUG(packet6_logger, DBG_DHCP6_DETAIL, DHCP6_DHCP4O6_RECEIVING);
// Receive message from IPC.
pkt = ipc.receive();
if (pkt) {
LOG_DEBUG(packet6_logger, DBG_DHCP6_BASIC, DHCP6_DHCP4O6_PACKET_RECEIVED)
.arg(static_cast<int>(pkt->getType()))
.arg(pkt->getRemoteAddr().toText())
.arg(pkt->getRemotePort())
.arg(pkt->getIface());
}
} catch (const std::exception& e) {
LOG_DEBUG(packet6_logger,DBG_DHCP6_DETAIL, DHCP6_DHCP4O6_RECEIVE_FAIL)
.arg(e.what());
}
if (!pkt) {
return;
}
// Should we check it is a DHCPV6_DHCPV4_RESPONSE?
// Handle relay port
uint16_t relay_port = Dhcpv6Srv::checkRelaySourcePort(pkt);
// The received message has been unpacked by the receive() function. This
// method could have modified the message so it's better to pack() it
// again because we'll be forwarding it to a client.
isc::util::OutputBuffer& buf = pkt->getBuffer();
buf.clear();
pkt->pack();
// Don't use getType(): get the message type from the buffer as we
// want to know if it is a relayed message (vs. internal message type).
// getType() always returns the type of internal message.
uint8_t msg_type = buf[0];
if (client_port) {
pkt->setRemotePort(client_port);
} else if ((msg_type == DHCPV6_RELAY_FORW) ||
(msg_type == DHCPV6_RELAY_REPL)) {
pkt->setRemotePort(relay_port ? relay_port : DHCP6_SERVER_PORT);
} else {
pkt->setRemotePort(DHCP6_CLIENT_PORT);
}
// Can't call the pkt6_send callout because we don't have the query
// From Dhcpv6Srv::processPacketBufferSend
try {
// Let's execute all callouts registered for buffer6_send
if (HooksManager::calloutsPresent(Dhcpv6Srv::getHookIndexBuffer6Send())) {
CalloutHandlePtr callout_handle = getCalloutHandle(pkt);
// Delete previously set arguments
callout_handle->deleteAllArguments();
// Use the RAII wrapper to make sure that the callout handle state is
// reset when this object goes out of scope. All hook points must do
// it to prevent possible circular dependency between the callout
// handle and its arguments.
ScopedCalloutHandleState callout_handle_state(callout_handle);
// Enable copying options from the packet within hook library.
ScopedEnableOptionsCopy<Pkt6> response6_options_copy(pkt);
// Pass incoming packet as argument
callout_handle->setArgument("response6", pkt);
// Call callouts
HooksManager::callCallouts(Dhcpv6Srv::getHookIndexBuffer6Send(),
*callout_handle);
// Callouts decided to skip the next processing step. The next
// processing step would be to parse the packet, so skip at this
// stage means drop.
if ((callout_handle->getStatus() == CalloutHandle::NEXT_STEP_SKIP) ||
(callout_handle->getStatus() == CalloutHandle::NEXT_STEP_DROP)) {
LOG_DEBUG(hooks_logger, DBG_DHCP6_HOOKS,
DHCP6_HOOK_BUFFER_SEND_SKIP)
.arg(pkt->getLabel());
return;
}
callout_handle->getArgument("response6", pkt);
}
LOG_DEBUG(packet6_logger, DBG_DHCP6_DETAIL_DATA, DHCP6_RESPONSE_DATA)
.arg(static_cast<int>(pkt->getType())).arg(pkt->toText());
// Forward packet to the client.
IfaceMgr::instance().send(pkt);
// Update statistics accordingly for sent packet.
Dhcpv6Srv::processStatsSent(pkt);
} catch (const std::exception& e) {
LOG_ERROR(packet6_logger, DHCP6_DHCP4O6_SEND_FAIL).arg(e.what());
}
}
} // namespace dhcp
} // namespace isc
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