29 #include <pcap/pcap.h>
33 #include <arpa/inet.h>
34 #include <net/ethernet.h>
37 #include <sys/ioctl.h>
40 #if defined(__linux__)
41 #include <netpacket/packet.h>
42 #include <sys/socket.h>
46 #if defined(__APPLE__) || defined(__FreeBSD__)
47 #include <net/if_dl.h>
51 #if !defined(PCAP_NETMASK_UNKNOWN)
56 #define PCAP_NETMASK_UNKNOWN 0xffffffff
65 const ethernet::Address& mcastAddress)
66 : m_pcap(nullptr, pcap_close)
68 , m_srcAddress(interface.etherAddress)
69 , m_destAddress(mcastAddress)
70 , m_interfaceName(interface.name)
71 #if defined(__linux__)
72 , m_interfaceIndex(interface.index)
80 this->
setScope(ndn::nfd::FACE_SCOPE_NON_LOCAL);
82 this->
setLinkType(ndn::nfd::LINK_TYPE_MULTI_ACCESS);
88 int fd = pcap_get_selectable_fd(m_pcap.get());
90 BOOST_THROW_EXCEPTION(
Error(
"pcap_get_selectable_fd failed"));
95 m_socket.assign(::dup(fd));
98 this->
setMtu(getInterfaceMtu());
105 snprintf(filter,
sizeof(filter),
106 "(ether proto 0x%x) && (ether dst %s) && (not ether src %s) && (not vlan)",
107 ethernet::ETHERTYPE_NDN,
108 m_destAddress.toString().c_str(),
109 m_srcAddress.toString().c_str());
110 setPacketFilter(filter);
112 if (!m_destAddress.isBroadcast() && !joinMulticastGroup()) {
114 pcap_set_promisc(m_pcap.get(), 1);
117 m_socket.async_read_some(boost::asio::null_buffers(),
118 bind(&EthernetTransport::handleRead,
this,
119 boost::asio::placeholders::error,
120 boost::asio::placeholders::bytes_transferred));
127 sendPacket(packet.packet);
134 if (m_socket.is_open()) {
137 boost::system::error_code error;
138 m_socket.cancel(error);
139 m_socket.close(error);
151 EthernetTransport::pcapInit()
153 char errbuf[PCAP_ERRBUF_SIZE] = {};
154 m_pcap.reset(pcap_create(m_interfaceName.c_str(), errbuf));
156 BOOST_THROW_EXCEPTION(Error(
"pcap_create: " + std::string(errbuf)));
158 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
163 pcap_set_immediate_mode(m_pcap.get(), 1);
166 if (pcap_activate(m_pcap.get()) < 0)
167 BOOST_THROW_EXCEPTION(Error(
"pcap_activate failed"));
169 if (pcap_set_datalink(m_pcap.get(), DLT_EN10MB) < 0)
170 BOOST_THROW_EXCEPTION(Error(
"pcap_set_datalink: " + std::string(pcap_geterr(m_pcap.get()))));
172 if (pcap_setdirection(m_pcap.get(), PCAP_D_IN) < 0)
178 EthernetTransport::setPacketFilter(
const char* filterString)
182 BOOST_THROW_EXCEPTION(Error(
"pcap_compile: " + std::string(pcap_geterr(m_pcap.get()))));
184 int ret = pcap_setfilter(m_pcap.get(), &filter);
185 pcap_freecode(&filter);
187 BOOST_THROW_EXCEPTION(Error(
"pcap_setfilter: " + std::string(pcap_geterr(m_pcap.get()))));
191 EthernetTransport::joinMulticastGroup()
193 #if defined(__linux__)
195 mr.mr_ifindex = m_interfaceIndex;
196 mr.mr_type = PACKET_MR_MULTICAST;
197 mr.mr_alen = m_destAddress.size();
198 std::memcpy(mr.mr_address, m_destAddress.data(), m_destAddress.size());
200 if (::setsockopt(m_socket.native_handle(), SOL_PACKET,
201 PACKET_ADD_MEMBERSHIP, &mr,
sizeof(mr)) == 0)
204 NFD_LOG_FACE_WARN(
"setsockopt(PACKET_ADD_MEMBERSHIP) failed: " << std::strerror(errno));
207 #if defined(SIOCADDMULTI)
209 std::strncpy(ifr.ifr_name, m_interfaceName.c_str(),
sizeof(ifr.ifr_name) - 1);
211 #if defined(__APPLE__) || defined(__FreeBSD__)
213 using boost::asio::ip::udp;
215 int fd = sock.native_handle();
229 sockaddr_dl* sdl =
reinterpret_cast<sockaddr_dl*
>(&ifr.ifr_addr);
230 sdl->sdl_len =
sizeof(ifr.ifr_addr);
231 sdl->sdl_family = AF_LINK;
232 sdl->sdl_alen = m_destAddress.size();
233 std::memcpy(LLADDR(sdl), m_destAddress.data(), m_destAddress.size());
235 static_assert(
sizeof(ifr.ifr_addr) >= offsetof(sockaddr_dl, sdl_data) + ethernet::ADDR_LEN,
236 "ifr_addr in struct ifreq is too small on this platform");
238 int fd = m_socket.native_handle();
240 ifr.ifr_hwaddr.sa_family = AF_UNSPEC;
241 std::memcpy(ifr.ifr_hwaddr.sa_data, m_destAddress.data(), m_destAddress.size());
243 static_assert(
sizeof(ifr.ifr_hwaddr.sa_data) >= ethernet::ADDR_LEN,
244 "ifr_hwaddr in struct ifreq is too small on this platform");
247 if (::ioctl(fd, SIOCADDMULTI, &ifr) == 0)
257 EthernetTransport::sendPacket(
const ndn::Block& block)
261 ndn::EncodingBuffer buffer(block);
264 if (block.size() < ethernet::MIN_DATA_LEN) {
265 static const uint8_t padding[ethernet::MIN_DATA_LEN] = {};
266 buffer.appendByteArray(padding, ethernet::MIN_DATA_LEN - block.size());
270 static uint16_t ethertype = htons(ethernet::ETHERTYPE_NDN);
271 buffer.prependByteArray(reinterpret_cast<const uint8_t*>(ðertype), ethernet::TYPE_LEN);
272 buffer.prependByteArray(m_srcAddress.data(), m_srcAddress.size());
273 buffer.prependByteArray(m_destAddress.data(), m_destAddress.size());
276 int sent = pcap_inject(m_pcap.get(), buffer.buf(), buffer.size());
279 else if (static_cast<size_t>(sent) < buffer.size())
280 NFD_LOG_FACE_ERROR(
"Failed to send the full frame: bufsize=" << buffer.size() <<
" sent=" << sent);
287 EthernetTransport::handleRead(
const boost::system::error_code& error,
size_t)
290 return processErrorCode(error);
293 const uint8_t* packet;
296 int ret = pcap_next_ex(m_pcap.get(), &header, &packet);
302 processIncomingPacket(header, packet);
306 ret = pcap_stats(m_pcap.get(), &ps);
311 if (ps.ps_drop - m_nDropped > 0)
313 m_nDropped = ps.ps_drop;
317 m_socket.async_read_some(boost::asio::null_buffers(),
318 bind(&EthernetTransport::handleRead,
this,
319 boost::asio::placeholders::error,
320 boost::asio::placeholders::bytes_transferred));
324 EthernetTransport::processIncomingPacket(
const pcap_pkthdr* header,
const uint8_t* packet)
326 size_t length = header->caplen;
327 if (length < ethernet::HDR_LEN + ethernet::MIN_DATA_LEN) {
332 const ether_header* eh =
reinterpret_cast<const ether_header*
>(packet);
333 const ethernet::Address sourceAddress(eh->ether_shost);
337 if (ntohs(eh->ether_type) != ethernet::ETHERTYPE_NDN)
341 BOOST_ASSERT_MSG(ethernet::Address(eh->ether_dhost) == m_destAddress,
342 "Received frame addressed to a different multicast group");
343 BOOST_ASSERT_MSG(sourceAddress != m_srcAddress,
344 "Received frame sent by this host");
346 packet += ethernet::HDR_LEN;
347 length -= ethernet::HDR_LEN;
351 std::tie(isOk, element) = Block::fromBuffer(packet, length);
357 NFD_LOG_FACE_TRACE(
"Received: " << element.size() <<
" bytes from " << sourceAddress.toString());
359 Transport::Packet tp(std::move(element));
360 static_assert(
sizeof(tp.remoteEndpoint) >= ethernet::ADDR_LEN,
361 "Transport::Packet::remoteEndpoint is too small");
362 std::memcpy(&tp.remoteEndpoint, sourceAddress.data(), sourceAddress.size());
367 EthernetTransport::processErrorCode(
const boost::system::error_code& error)
371 if (error == boost::asio::error::operation_aborted ||
383 EthernetTransport::getInterfaceMtu()
386 #if defined(__APPLE__) || defined(__FreeBSD__)
388 using boost::asio::ip::udp;
390 int fd = sock.native_handle();
392 int fd = m_socket.native_handle();
396 std::strncpy(ifr.ifr_name, m_interfaceName.c_str(),
sizeof(ifr.ifr_name) - 1);
398 if (::ioctl(fd, SIOCGIFMTU, &ifr) == 0) {
400 return static_cast<size_t>(ifr.ifr_mtu);
407 return ethernet::MAX_DATA_LEN;
void setLocalUri(const FaceUri &uri)
#define NFD_LOG_FACE_TRACE(msg)
Log a message at TRACE level.
contains information about a network interface
void setScope(ndn::nfd::FaceScope scope)
#define NFD_LOG_FACE_DEBUG(msg)
Log a message at DEBUG level.
EthernetTransport(const NetworkInterfaceInfo &interface, const ethernet::Address &mcastAddress)
Creates an Ethernet-based transport for multicast communication.
void receive(Packet &&packet)
receive a link-layer packet
stores a packet along with the remote endpoint
void doClose() final
performs Transport specific operations to close the transport
the transport is being closed due to a failure
#define NFD_LOG_FACE_WARN(msg)
Log a message at WARN level.
Copyright (c) 2014-2015, Regents of the University of California, Arizona Board of Regents...
the transport is closed, and can be safely deallocated
#define NFD_LOG_FACE_INFO(msg)
Log a message at INFO level.
void setLinkType(ndn::nfd::LinkType linkType)
the transport is requested to be closed
void setPersistency(ndn::nfd::FacePersistency newPersistency)
changes face persistency setting
#define NFD_LOG_INIT(name)
TransportState getState() const
#define PCAP_NETMASK_UNKNOWN
Copyright (c) 2014-2017, Regents of the University of California, Arizona Board of Regents...
void setState(TransportState newState)
set transport state
void setRemoteUri(const FaceUri &uri)
#define NFD_LOG_FACE_ERROR(msg)
Log a message at ERROR level.
boost::asio::io_service & getGlobalIoService()