feat: boostrap hicn 22.02

The current patch provides several new features, improvements,
bug fixes and also complete rewrite of entire components.

- lib
The hicn packet parser has been improved with a new packet
format fully based on UDP. The TCP header is still temporarily
supported but the UDP header will replace completely the new hicn
packet format. Improvements have been made to make sure every
packet parsing operation is made via this library. The current
new header can be used as header between the payload and the
UDP header or as trailer in the UDP surplus area to be tested
when UDP options will start to be used.

- hicn-light
The portable packet forwarder has been completely rewritten from
scratch with the twofold objective to improve performance and
code size but  also to drop dependencies such as libparc which is
now removed by the current implementation.

- hicn control
the control library is the agent that is used to program the
packet forwarders via their binary API. This component has
benefited from significant improvements in terms of interaction
model which is now event driven and more robust to failures.

- VPP plugin has been updated to support VPP 22.02

- transport
Major improvement have been made to the RTC protocol, to the
support of IO modules and to the security sub system. Signed
manifests are the default data authenticity and integrity framework.
Confidentiality can be enabled by sharing the encryption key to the
prod/cons layer. The library has been tested with group key based
applications such as broadcast/multicast and real-time on-line
meetings with trusted server keys or MLS.

- testing
Unit testing has been introduced using GoogleTest. One third of
the code base is covered by unit testing with priority on
critical features. Functional testing has also been introduce
using Docker, linux bridging and Robot Framework to define
test with Less Code techniques to facilitate the extension
of the coverage.

Co-authored-by: Mauro Sardara <msardara@cisco.com>
Co-authored-by: Jordan Augé <jordan.auge+fdio@cisco.com>
Co-authored-by: Michele Papalini <micpapal@cisco.com>
Co-authored-by: Angelo Mantellini <manangel@cisco.com>
Co-authored-by: Jacques Samain <jsamain@cisco.com>
Co-authored-by: Olivier Roques <oroques+fdio@cisco.com>
Co-authored-by: Enrico Loparco <eloparco@cisco.com>
Co-authored-by: Giulio Grassi <gigrassi@cisco.com>

Change-Id: I75d0ef70f86d921e3ef503c99271216ff583c215
Signed-off-by: Luca Muscariello <muscariello@ieee.org>
Signed-off-by: Mauro Sardara <msardara@cisco.com>

1 files changed, 371 insertions, 0 deletions

diff --git a/libtransport/src/core/udp_connector.cc b/libtransport/src/core/udp_connector.cc
new file mode 100644
index 000000000..ee0c7ea9c
--- /dev/null
+++ b/libtransport/src/core/udp_connector.cc
@@ -0,0 +1,371 @@
+/*
+ * Copyright (c) 2021 Cisco and/or its affiliates.
+ */
+
+#include <core/errors.h>
+#include <core/udp_connector.h>
+#include <glog/logging.h>
+#include <hicn/transport/utils/branch_prediction.h>
+
+#include <iostream>
+#include <thread>
+#include <vector>
+
+namespace transport {
+namespace core {
+
+UdpTunnelConnector::~UdpTunnelConnector() {}
+
+void UdpTunnelConnector::connect(const std::string &hostname, uint16_t port,
+                                 const std::string &bind_address,
+                                 uint16_t bind_port) {
+  if (state_ == State::CLOSED) {
+    state_ = State::CONNECTING;
+
+    asio::ip::udp::resolver::query query(asio::ip::udp::v4(), hostname,
+                                         std::to_string(port));
+
+    endpoint_iterator_ = resolver_.resolve(query);
+    remote_endpoint_send_ = *endpoint_iterator_;
+    socket_->open(remote_endpoint_send_.protocol());
+
+    if (!bind_address.empty() && bind_port != 0) {
+      using namespace asio::ip;
+
+      auto address = address::from_string(bind_address);
+      if (address.is_v6()) {
+        std::error_code ec;
+        socket_->set_option(asio::ip::v6_only(false), ec);
+        // Call succeeds only on dual stack systems.
+      }
+
+      socket_->bind(udp::endpoint(address, bind_port));
+    }
+
+    remote_endpoint_ = Endpoint(remote_endpoint_send_);
+    local_endpoint_ = Endpoint(socket_->local_endpoint());
+
+    auto self = shared_from_this();
+    doConnect(self);
+  }
+}
+
+void UdpTunnelConnector::send(Packet &packet) {
+  send(packet.shared_from_this());
+}
+
+void UdpTunnelConnector::send(const utils::MemBuf::Ptr &buffer) {
+  auto self = shared_from_this();
+  io_service_.post([self, pkt{buffer}]() {
+    bool write_in_progress = !self->output_buffer_.empty();
+    self->output_buffer_.push_back(std::move(pkt));
+    if (TRANSPORT_EXPECT_TRUE(self->state_ == State::CONNECTED)) {
+      if (!write_in_progress) {
+        self->doSendPacket(self);
+      }
+    } else {
+      self->data_available_ = true;
+    }
+  });
+}
+
+void UdpTunnelConnector::close() {
+  DLOG_IF(INFO, VLOG_IS_ON(2)) << "UDPTunnelConnector::close";
+  state_ = State::CLOSED;
+  bool is_socket_owned = socket_.use_count() == 1;
+  if (is_socket_owned) {
+    // Here we use a shared ptr to keep the object alive until we call the close
+    // function
+    auto self = shared_from_this();
+    io_service_.dispatch([this, self]() {
+      socket_->close();
+      // on_close_callback_(shared_from_this());
+    });
+  }
+}
+
+void UdpTunnelConnector::doSendPacket(
+    const std::shared_ptr<UdpTunnelConnector> &self) {
+#ifdef LINUX
+  send_timer_.expires_from_now(std::chrono::microseconds(50));
+  send_timer_.async_wait([self](const std::error_code &ec) {
+    if (ec) {
+      return;
+    }
+
+    self->writeHandler();
+  });
+#else
+  auto packet = output_buffer_.front().get();
+  auto array = std::vector<asio::const_buffer>();
+
+  const ::utils::MemBuf *current = packet;
+  do {
+    array.push_back(asio::const_buffer(current->data(), current->length()));
+    current = current->next();
+  } while (current != packet);
+
+  socket_->async_send_to(
+      std::move(array), remote_endpoint_send_,
+      [this, self](const std::error_code &ec, std::size_t length) {
+        if (TRANSPORT_EXPECT_TRUE(!ec)) {
+          sent_callback_(this, make_error_code(core_error::success));
+        } else if (ec.value() ==
+                   static_cast<int>(std::errc::operation_canceled)) {
+          // The connection has been closed by the application.
+          return;
+        } else {
+          sendFailed();
+          sent_callback_(this, ec);
+        }
+
+        output_buffer_.pop_front();
+        if (!output_buffer_.empty()) {
+          doSendPacket(self);
+        }
+      });
+#endif
+}
+
+void UdpTunnelConnector::retryConnection() {
+  // The connection was refused. In this case let's retry to reconnect.
+  connection_reattempts_++;
+  LOG(ERROR) << "Error in UDP: Connection refused. Retrying...";
+  state_ = State::CONNECTING;
+  timer_.expires_from_now(std::chrono::milliseconds(500));
+  std::weak_ptr<UdpTunnelConnector> self = shared_from_this();
+  timer_.async_wait([self, this](const std::error_code &ec) {
+    if (ec) {
+    }
+    if (auto ptr = self.lock()) {
+      doConnect(ptr);
+    }
+  });
+  return;
+}
+
+#ifdef LINUX
+void UdpTunnelConnector::writeHandler() {
+  if (TRANSPORT_EXPECT_FALSE(state_ != State::CONNECTED)) {
+    return;
+  }
+
+  auto len = std::min(output_buffer_.size(), std::size_t(Connector::max_burst));
+
+  if (len) {
+    int m = 0;
+    for (auto &p : output_buffer_) {
+      auto packet = p.get();
+      ::utils::MemBuf *current = packet;
+      int b = 0;
+      do {
+        // array.push_back(asio::const_buffer(current->data(),
+        // current->length()));
+        tx_iovecs_[m][b].iov_base = current->writableData();
+        tx_iovecs_[m][b].iov_len = current->length();
+        current = current->next();
+        b++;
+      } while (current != packet);
+
+      tx_msgs_[m].msg_hdr.msg_iov = tx_iovecs_[m];
+      tx_msgs_[m].msg_hdr.msg_iovlen = b;
+      tx_msgs_[m].msg_hdr.msg_name = remote_endpoint_send_.data();
+      tx_msgs_[m].msg_hdr.msg_namelen = remote_endpoint_send_.size();
+      m++;
+
+      if (--len == 0) {
+        break;
+      }
+    }
+
+    int retval = sendmmsg(socket_->native_handle(), tx_msgs_, m, MSG_DONTWAIT);
+    if (retval > 0) {
+      while (retval--) {
+        output_buffer_.pop_front();
+      }
+    } else if (errno != EWOULDBLOCK && errno != EAGAIN) {
+      LOG(ERROR) << "Error sending messages: " << strerror(errno);
+      sent_callback_(this, make_error_code(core_error::send_failed));
+      return;
+    }
+  }
+
+  if (!output_buffer_.empty()) {
+    send_timer_.expires_from_now(std::chrono::microseconds(50));
+    std::weak_ptr<UdpTunnelConnector> self = shared_from_this();
+    send_timer_.async_wait([self](const std::error_code &ec) {
+      if (ec) {
+        return;
+      }
+      if (auto ptr = self.lock()) {
+        ptr->writeHandler();
+      }
+    });
+  }
+}
+
+void UdpTunnelConnector::readHandler(const std::error_code &ec) {
+  DLOG_IF(INFO, VLOG_IS_ON(3)) << "UdpTunnelConnector receive packet";
+
+  if (TRANSPORT_EXPECT_TRUE(!ec)) {
+    if (TRANSPORT_EXPECT_TRUE(state_ == State::CONNECTED)) {
+      if (current_position_ == 0) {
+        for (int i = 0; i < max_burst; i++) {
+          auto read_buffer = getRawBuffer();
+          rx_iovecs_[i][0].iov_base = read_buffer.first;
+          rx_iovecs_[i][0].iov_len = read_buffer.second;
+          rx_msgs_[i].msg_hdr.msg_iov = rx_iovecs_[i];
+          rx_msgs_[i].msg_hdr.msg_iovlen = 1;
+        }
+      }
+
+      int res = recvmmsg(socket_->native_handle(), rx_msgs_ + current_position_,
+                         max_burst - current_position_, MSG_DONTWAIT, nullptr);
+      if (res < 0) {
+        if (errno == EWOULDBLOCK || errno == EAGAIN) {
+          // Try again later
+          return;
+        }
+
+        if (errno == ECONNREFUSED &&
+            connection_reattempts_ < max_reconnection_reattempts) {
+          retryConnection();
+          return;
+        }
+
+        LOG(ERROR) << "Error receiving messages! " << strerror(errno) << " "
+                   << res;
+        std::vector<utils::MemBuf::Ptr> v;
+        auto ec = make_error_code(core_error::receive_failed);
+
+        receive_callback_(this, v, ec);
+        return;
+      }
+
+      std::vector<utils::MemBuf::Ptr> v;
+      v.reserve(res);
+      for (int i = 0; i < res; i++) {
+        auto packet = getPacketFromBuffer(
+            reinterpret_cast<uint8_t *>(
+                rx_msgs_[current_position_].msg_hdr.msg_iov[0].iov_base),
+            rx_msgs_[current_position_].msg_len);
+        receiveSuccess(*packet);
+        v.push_back(std::move(packet));
+        ++current_position_;
+      }
+
+      receive_callback_(this, v, make_error_code(core_error::success));
+
+      doRecvPacket();
+    } else {
+      LOG(ERROR) << "Error in UDP: Receiving packets from a not "
+                    "connected socket.";
+    }
+  } else if (ec.value() == static_cast<int>(std::errc::operation_canceled)) {
+    LOG(ERROR) << "The connection has been closed by the application.";
+    return;
+  } else {
+    if (TRANSPORT_EXPECT_TRUE(state_ == State::CONNECTED)) {
+      // receive_callback_(this, *read_msg_, ec);
+      LOG(ERROR) << "Error in UDP connector: " << ec.value() << " "
+                 << ec.message();
+    } else {
+      LOG(ERROR) << "Error in connector while not connected. " << ec.value()
+                 << " " << ec.message();
+    }
+  }
+}
+#endif
+
+void UdpTunnelConnector::doRecvPacket() {
+  std::weak_ptr<UdpTunnelConnector> self = shared_from_this();
+#ifdef LINUX
+  if (state_ == State::CONNECTED) {
+#if ((ASIO_VERSION / 100 % 1000) < 11)
+    socket_->async_receive(asio::null_buffers(),
+#else
+    socket_->async_wait(asio::ip::tcp::socket::wait_read,
+#endif
+                           [self](const std::error_code &ec) {
+                             if (ec) {
+                               LOG(ERROR)
+                                   << "Error in UDP connector: " << ec.value()
+                                   << " " << ec.message();
+                               return;
+                             }
+                             if (auto ptr = self.lock()) {
+                               ptr->readHandler(ec);
+                             }
+                           });
+  }
+#else
+  DLOG_IF(INFO, VLOG_IS_ON(3)) << "UdpTunnelConnector receive packet";
+  read_msg_ = getRawBuffer();
+  socket_->async_receive_from(
+      asio::buffer(read_msg_.first, read_msg_.second), remote_endpoint_recv_,
+      [this, self](const std::error_code &ec, std::size_t length) {
+        if (auto ptr = self.lock()) {
+          DLOG_IF(INFO, VLOG_IS_ON(3))
+              << "UdpTunnelConnector received packet length=" << length;
+          if (TRANSPORT_EXPECT_TRUE(!ec)) {
+            if (TRANSPORT_EXPECT_TRUE(state_ == State::CONNECTED)) {
+              auto packet = getPacketFromBuffer(read_msg_.first, length);
+              receiveSuccess(*packet);
+              std::vector<utils::MemBuf::Ptr> v{std::move(packet)};
+              receive_callback_(this, v, make_error_code(core_error::success));
+              doRecvPacket();
+            } else {
+              LOG(ERROR) << "Error in UDP: Receiving packets from a not "
+                            "connected socket.";
+            }
+          } else if (ec.value() ==
+                     static_cast<int>(std::errc::operation_canceled)) {
+            LOG(ERROR) << "The connection has been closed by the application.";
+            return;
+          } else if (ec.value() ==
+                     static_cast<int>(std::errc::connection_refused)) {
+            if (connection_reattempts_ < max_reconnection_reattempts) {
+              retryConnection();
+            }
+          } else {
+            if (TRANSPORT_EXPECT_TRUE(state_ == State::CONNECTED)) {
+              LOG(ERROR) << "Error in UDP connector: " << ec.value()
+                         << ec.message();
+            } else {
+              LOG(ERROR) << "Error while not connected";
+            }
+          }
+        }
+      });
+#endif
+}
+
+void UdpTunnelConnector::doConnect(
+    std::shared_ptr<UdpTunnelConnector> &self_shared) {
+  std::weak_ptr<UdpTunnelConnector> self = self_shared;
+  asio::async_connect(*socket_, endpoint_iterator_,
+                      [this, self](const std::error_code &ec,
+                                   asio::ip::udp::resolver::iterator) {
+                        if (auto ptr = self.lock()) {
+                          if (!ec) {
+                            state_ = State::CONNECTED;
+                            doRecvPacket();
+
+                            if (data_available_) {
+                              data_available_ = false;
+                              doSendPacket(ptr);
+                            }
+
+                            on_reconnect_callback_(
+                                this, make_error_code(core_error::success));
+                          } else {
+                            LOG(ERROR) << "UDP Connection failed!!!";
+                            retryConnection();
+                          }
+                        }
+                      });
+}
+
+}  // namespace core
+
+}  // namespace transport