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/*
* Copyright (c) 2017-2020 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <io_modules/udp/hicn_forwarder_module.h>
#include <io_modules/udp/udp_socket_connector.h>
union AddressLight {
uint32_t ipv4;
struct in6_addr ipv6;
};
typedef struct {
uint8_t message_type;
uint8_t command_id;
uint16_t length;
uint32_t seq_num;
} CommandHeader;
typedef struct {
uint8_t message_type;
uint8_t command_id;
uint16_t length;
uint32_t seq_num;
char symbolic_or_connid[16];
union AddressLight address;
uint16_t cost;
uint8_t address_type;
uint8_t len;
} RouteToSelfCommand;
typedef struct {
uint8_t message_type;
uint8_t command_id;
uint16_t length;
uint32_t seq_num;
char symbolic_or_connid[16];
} DeleteSelfConnectionCommand;
namespace {
static constexpr uint8_t addr_inet = 1;
static constexpr uint8_t addr_inet6 = 2;
static constexpr uint8_t add_route_command = 3;
static constexpr uint8_t delete_connection_command = 5;
static constexpr uint8_t request_light = 0xc0;
static constexpr char identifier[] = "SELF";
void fillCommandHeader(CommandHeader *header) {
// Allocate and fill the header
header->message_type = request_light;
header->length = 1;
}
RouteToSelfCommand createCommandRoute(std::unique_ptr<sockaddr> &&addr,
uint8_t prefix_length) {
RouteToSelfCommand command = {0};
// check and set IP address
if (addr->sa_family == AF_INET) {
command.address_type = addr_inet;
command.address.ipv4 = ((sockaddr_in *)addr.get())->sin_addr.s_addr;
} else if (addr->sa_family == AF_INET6) {
command.address_type = addr_inet6;
command.address.ipv6 = ((sockaddr_in6 *)addr.get())->sin6_addr;
}
// Fill remaining payload fields
#ifndef _WIN32
strcpy(command.symbolic_or_connid, identifier);
#else
strcpy_s(command.symbolic_or_connid, 16, identifier);
#endif
command.cost = 1;
command.len = (uint8_t)prefix_length;
// Allocate and fill the header
command.command_id = add_route_command;
fillCommandHeader((CommandHeader *)&command);
return command;
}
DeleteSelfConnectionCommand createCommandDeleteConnection() {
DeleteSelfConnectionCommand command = {0};
fillCommandHeader((CommandHeader *)&command);
command.command_id = delete_connection_command;
#ifndef _WIN32
strcpy(command.symbolic_or_connid, identifier);
#else
strcpy_s(command.symbolic_or_connid, 16, identifier);
#endif
return command;
}
} // namespace
namespace transport {
namespace core {
HicnForwarderModule::HicnForwarderModule() : IoModule(), connector_(nullptr) {}
HicnForwarderModule::~HicnForwarderModule() {}
void HicnForwarderModule::connect(bool is_consumer) {
connector_->connect();
connector_->setRole(is_consumer ? Connector::Role::CONSUMER
: Connector::Role::PRODUCER);
}
bool HicnForwarderModule::isConnected() { return connector_->isConnected(); }
void HicnForwarderModule::send(Packet &packet) {
IoModule::send(packet);
packet.setChecksum();
connector_->send(packet);
}
void HicnForwarderModule::send(const uint8_t *packet, std::size_t len) {
counters_.tx_packets++;
counters_.tx_bytes += len;
// Perfect forwarding
connector_->send(packet, len);
}
void HicnForwarderModule::registerRoute(const Prefix &prefix) {
auto command = createCommandRoute(prefix.toSockaddr(),
(uint8_t)prefix.getPrefixLength());
send((uint8_t *)&command, sizeof(RouteToSelfCommand));
}
void HicnForwarderModule::closeConnection() {
auto command = createCommandDeleteConnection();
send((uint8_t *)&command, sizeof(DeleteSelfConnectionCommand));
connector_->close();
}
void HicnForwarderModule::init(
Connector::PacketReceivedCallback &&receive_callback,
Connector::OnReconnectCallback &&reconnect_callback,
asio::io_service &io_service, const std::string &app_name) {
if (!connector_) {
connector_ = new UdpSocketConnector(std::move(receive_callback), nullptr,
nullptr, std::move(reconnect_callback),
io_service, app_name);
}
}
void HicnForwarderModule::processControlMessageReply(
utils::MemBuf &packet_buffer) {
if (packet_buffer.data()[0] == nack_code) {
throw errors::RuntimeException(
"Received Nack message from hicn light forwarder.");
}
}
std::uint32_t HicnForwarderModule::getMtu() { return interface_mtu; }
bool HicnForwarderModule::isControlMessage(const uint8_t *message) {
return message[0] == ack_code || message[0] == nack_code;
}
extern "C" IoModule *create_module(void) { return new HicnForwarderModule(); }
} // namespace core
} // namespace transport
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