net: refactor netlink message parsing, add extack support
Change-Id: Iaa132d8cb1aece6cfc608cc1c3b4478982ac706e
diff --git a/src/net/detail/netlink-util.hpp b/src/net/detail/netlink-util.hpp
new file mode 100644
index 0000000..15f54f3
--- /dev/null
+++ b/src/net/detail/netlink-util.hpp
@@ -0,0 +1,339 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2018 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ *
+ * @author Davide Pesavento <davide.pesavento@lip6.fr>
+ */
+
+#ifndef NDN_NET_NETLINK_UTIL_HPP
+#define NDN_NET_NETLINK_UTIL_HPP
+
+#include "../../common.hpp"
+#include "../ethernet.hpp"
+
+#ifndef NDN_CXX_HAVE_RTNETLINK
+#error "This file should not be included ..."
+#endif
+
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <string.h>
+
+#include <cstring>
+#include <map>
+
+#include <boost/asio/ip/address.hpp>
+
+namespace ndn {
+namespace net {
+
+template<typename T>
+constexpr size_t
+getAttributeLength(const T* attr);
+
+template<>
+constexpr size_t
+getAttributeLength(const nlattr* attr)
+{
+ return attr->nla_len;
+}
+
+template<>
+constexpr size_t
+getAttributeLength(const rtattr* attr)
+{
+ return attr->rta_len;
+}
+
+template<typename T>
+constexpr size_t
+getAttributeLengthAligned(const T* attr);
+
+template<>
+constexpr size_t
+getAttributeLengthAligned(const nlattr* attr)
+{
+ return NLA_ALIGN(attr->nla_len);
+}
+
+template<>
+constexpr size_t
+getAttributeLengthAligned(const rtattr* attr)
+{
+ return RTA_ALIGN(attr->rta_len);
+}
+
+template<typename T>
+constexpr uint16_t
+getAttributeType(const T* attr);
+
+template<>
+constexpr uint16_t
+getAttributeType(const nlattr* attr)
+{
+ return attr->nla_type & NLA_TYPE_MASK;
+}
+
+template<>
+constexpr uint16_t
+getAttributeType(const rtattr* attr)
+{
+ return attr->rta_type;
+}
+
+template<typename T>
+const uint8_t*
+getAttributeValue(const T* attr);
+
+template<>
+inline const uint8_t*
+getAttributeValue(const nlattr* attr)
+{
+ return reinterpret_cast<const uint8_t*>(attr) + NLA_HDRLEN;
+}
+
+template<>
+inline const uint8_t*
+getAttributeValue(const rtattr* attr)
+{
+ return reinterpret_cast<const uint8_t*>(RTA_DATA(const_cast<rtattr*>(attr)));
+}
+
+template<typename T>
+constexpr size_t
+getAttributeValueLength(const T* attr);
+
+template<>
+constexpr size_t
+getAttributeValueLength(const nlattr* attr)
+{
+ return attr->nla_len - NLA_HDRLEN;
+}
+
+template<>
+constexpr size_t
+getAttributeValueLength(const rtattr* attr)
+{
+ return RTA_PAYLOAD(attr);
+}
+
+template<typename T>
+class NetlinkMessageAttributes;
+
+class NetlinkMessage
+{
+public:
+ explicit
+ NetlinkMessage(const uint8_t* buf, size_t buflen) noexcept
+ : m_msg(reinterpret_cast<const nlmsghdr*>(buf))
+ , m_length(buflen)
+ {
+ BOOST_ASSERT(buf != nullptr);
+ }
+
+ const nlmsghdr&
+ operator*() const noexcept
+ {
+ return *m_msg;
+ }
+
+ const nlmsghdr*
+ operator->() const noexcept
+ {
+ return m_msg;
+ }
+
+ bool
+ isValid() const noexcept
+ {
+ return NLMSG_OK(m_msg, m_length);
+ }
+
+ NetlinkMessage
+ getNext() const noexcept
+ {
+ BOOST_ASSERT(isValid());
+
+ // mimic NLMSG_NEXT
+ auto thisLen = NLMSG_ALIGN(m_msg->nlmsg_len);
+ return NetlinkMessage{reinterpret_cast<const uint8_t*>(m_msg) + thisLen, m_length - thisLen};
+ }
+
+ template<typename T>
+ const T*
+ getPayload() const noexcept
+ {
+ BOOST_ASSERT(isValid());
+
+ if (m_msg->nlmsg_len < NLMSG_LENGTH(sizeof(T)))
+ return nullptr;
+
+ return reinterpret_cast<const T*>(NLMSG_DATA(const_cast<nlmsghdr*>(m_msg)));
+ }
+
+ template<typename AttributeT, typename PayloadT>
+ NetlinkMessageAttributes<AttributeT>
+ getAttributes(const PayloadT* p) const noexcept
+ {
+ BOOST_ASSERT(isValid());
+
+ auto begin = reinterpret_cast<const uint8_t*>(p) + NLMSG_ALIGN(sizeof(PayloadT));
+ auto length = NLMSG_PAYLOAD(m_msg, sizeof(PayloadT));
+ return NetlinkMessageAttributes<AttributeT>{reinterpret_cast<const AttributeT*>(begin), length};
+ }
+
+private:
+ const nlmsghdr* m_msg;
+ size_t m_length;
+};
+
+template<typename T>
+class NetlinkMessageAttributes
+{
+ // empty type used to implement tag dispatching in getAttributeByType()
+ template<typename U>
+ struct AttrValueTypeTag {};
+
+public:
+ explicit
+ NetlinkMessageAttributes(const T* begin, size_t length) noexcept
+ {
+ for (; isAttrValid(begin, length); begin = getNextAttr(begin, length)) {
+ m_attrs[getAttributeType(begin)] = begin;
+ }
+ }
+
+ size_t
+ size() const noexcept
+ {
+ return m_attrs.size();
+ }
+
+ template<typename U>
+ optional<U>
+ getAttributeByType(uint16_t attrType) const
+ {
+ auto it = m_attrs.find(attrType);
+ if (it == m_attrs.end())
+ return nullopt;
+
+ return convertAttrValue(getAttributeValue(it->second),
+ getAttributeValueLength(it->second),
+ AttrValueTypeTag<U>{});
+ }
+
+private:
+ static bool
+ isAttrValid(const T* attr, size_t nBytesRemaining) noexcept
+ {
+ return attr != nullptr &&
+ nBytesRemaining >= sizeof(T) &&
+ getAttributeLength(attr) >= sizeof(T) &&
+ getAttributeLength(attr) <= nBytesRemaining;
+ }
+
+ static const T*
+ getNextAttr(const T* attr, size_t& nBytesRemaining) noexcept
+ {
+ auto len = getAttributeLengthAligned(attr);
+ if (len > nBytesRemaining) // prevent integer underflow
+ return nullptr;
+
+ nBytesRemaining -= len;
+ return reinterpret_cast<const T*>(reinterpret_cast<const uint8_t*>(attr) + len);
+ }
+
+ template<typename Integral>
+ static std::enable_if_t<std::is_integral<Integral>::value, optional<Integral>>
+ convertAttrValue(const uint8_t* val, size_t len, AttrValueTypeTag<Integral>)
+ {
+ if (len < sizeof(Integral))
+ return nullopt;
+
+ Integral i;
+ std::memcpy(&i, val, sizeof(Integral));
+ return i;
+ }
+
+ static optional<std::string>
+ convertAttrValue(const uint8_t* val, size_t len, AttrValueTypeTag<std::string>)
+ {
+ auto str = reinterpret_cast<const char*>(val);
+ if (::strnlen(str, len) < len)
+ return std::string(str);
+ else
+ return nullopt;
+ }
+
+ static optional<ethernet::Address>
+ convertAttrValue(const uint8_t* val, size_t len, AttrValueTypeTag<ethernet::Address>)
+ {
+ if (len < ethernet::ADDR_LEN)
+ return nullopt;
+
+ return ethernet::Address(val);
+ }
+
+ template<typename IpAddress>
+ static std::enable_if_t<std::is_same<IpAddress, boost::asio::ip::address_v4>::value ||
+ std::is_same<IpAddress, boost::asio::ip::address_v6>::value, optional<IpAddress>>
+ convertAttrValue(const uint8_t* val, size_t len, AttrValueTypeTag<IpAddress>)
+ {
+ typename IpAddress::bytes_type bytes;
+ if (len < bytes.size())
+ return nullopt;
+
+ std::copy_n(val, bytes.size(), bytes.begin());
+ return IpAddress(bytes);
+ }
+
+private:
+ std::map<uint16_t, const T*> m_attrs;
+};
+
+inline const char*
+nlmsgTypeToString(uint16_t type) noexcept
+{
+#define NLMSG_STRINGIFY(x) case NLMSG_##x: return "<" #x ">"
+#define RTM_STRINGIFY(x) case RTM_##x: return "<" #x ">"
+ switch (type) {
+ NLMSG_STRINGIFY(NOOP);
+ NLMSG_STRINGIFY(ERROR);
+ NLMSG_STRINGIFY(DONE);
+ NLMSG_STRINGIFY(OVERRUN);
+ RTM_STRINGIFY(NEWLINK);
+ RTM_STRINGIFY(DELLINK);
+ RTM_STRINGIFY(GETLINK);
+ RTM_STRINGIFY(NEWADDR);
+ RTM_STRINGIFY(DELADDR);
+ RTM_STRINGIFY(GETADDR);
+ RTM_STRINGIFY(NEWROUTE);
+ RTM_STRINGIFY(DELROUTE);
+ RTM_STRINGIFY(GETROUTE);
+ default:
+ return "";
+ }
+#undef NLMSG_STRINGIFY
+#undef RTM_STRINGIFY
+}
+
+} // namespace net
+} // namespace ndn
+
+#endif // NDN_NET_NETLINK_UTIL_HPP
diff --git a/src/net/detail/network-monitor-impl-netlink.cpp b/src/net/detail/network-monitor-impl-netlink.cpp
new file mode 100644
index 0000000..13b8c0e
--- /dev/null
+++ b/src/net/detail/network-monitor-impl-netlink.cpp
@@ -0,0 +1,543 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2018 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ *
+ * @author Davide Pesavento <davide.pesavento@lip6.fr>
+ */
+
+#include "network-monitor-impl-netlink.hpp"
+#include "linux-if-constants.hpp"
+#include "netlink-util.hpp"
+#include "../network-address.hpp"
+#include "../network-interface.hpp"
+#include "../../util/logger.hpp"
+#include "../../util/time.hpp"
+
+#include <cerrno>
+#include <cstdlib>
+
+#include <linux/if_addr.h>
+#include <linux/if_link.h>
+#include <net/if_arp.h>
+#include <sys/socket.h>
+
+#include <boost/asio/write.hpp>
+
+#ifndef SOL_NETLINK
+#define SOL_NETLINK 270
+#endif
+
+#ifndef RTEXT_FILTER_SKIP_STATS
+#define RTEXT_FILTER_SKIP_STATS (1 << 3)
+#endif
+
+NDN_LOG_INIT(ndn.NetworkMonitor);
+
+namespace ndn {
+namespace net {
+
+struct RtnlRequest
+{
+ nlmsghdr nlh;
+ ifinfomsg ifi;
+ rtattr rta alignas(NLMSG_ALIGNTO); // rtattr has to be aligned
+ uint32_t rtext; // space for IFLA_EXT_MASK
+};
+
+NetworkMonitorImplNetlink::NetworkMonitorImplNetlink(boost::asio::io_service& io)
+ : m_socket(make_shared<boost::asio::posix::stream_descriptor>(io))
+ , m_pid(0)
+ , m_sequenceNo(static_cast<uint32_t>(time::system_clock::now().time_since_epoch().count()))
+ , m_isEnumeratingLinks(false)
+ , m_isEnumeratingAddresses(false)
+{
+ NDN_LOG_TRACE("creating NETLINK_ROUTE socket");
+ initSocket(NETLINK_ROUTE);
+ for (auto group : {RTNLGRP_LINK,
+ RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV4_ROUTE,
+ RTNLGRP_IPV6_IFADDR, RTNLGRP_IPV6_ROUTE}) {
+ joinGroup(group);
+ }
+
+ asyncRead();
+
+ NDN_LOG_TRACE("enumerating links");
+ sendDumpRequest(RTM_GETLINK);
+ m_isEnumeratingLinks = true;
+}
+
+NetworkMonitorImplNetlink::~NetworkMonitorImplNetlink()
+{
+ boost::system::error_code error;
+ m_socket->close(error);
+}
+
+shared_ptr<const NetworkInterface>
+NetworkMonitorImplNetlink::getNetworkInterface(const std::string& ifname) const
+{
+ for (const auto& e : m_interfaces) {
+ if (e.second->getName() == ifname)
+ return e.second;
+ }
+ return nullptr;
+}
+
+std::vector<shared_ptr<const NetworkInterface>>
+NetworkMonitorImplNetlink::listNetworkInterfaces() const
+{
+ std::vector<shared_ptr<const NetworkInterface>> v;
+ v.reserve(m_interfaces.size());
+
+ for (const auto& e : m_interfaces) {
+ v.push_back(e.second);
+ }
+ return v;
+}
+
+bool
+NetworkMonitorImplNetlink::isEnumerating() const
+{
+ return m_isEnumeratingLinks || m_isEnumeratingAddresses;
+}
+
+void
+NetworkMonitorImplNetlink::initSocket(int family)
+{
+ int fd = ::socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, family);
+ if (fd < 0) {
+ BOOST_THROW_EXCEPTION(Error("Cannot create netlink socket ("s + std::strerror(errno) + ")"));
+ }
+ m_socket->assign(fd);
+
+ // increase socket receive buffer to 1MB to avoid losing messages
+ const int bufsize = 1 * 1024 * 1024;
+ if (::setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bufsize, sizeof(bufsize)) < 0) {
+ // not a fatal error
+ NDN_LOG_DEBUG("setting SO_RCVBUF failed: " << std::strerror(errno));
+ }
+
+ sockaddr_nl addr{};
+ addr.nl_family = AF_NETLINK;
+ if (::bind(fd, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0) {
+ BOOST_THROW_EXCEPTION(Error("Cannot bind netlink socket ("s + std::strerror(errno) + ")"));
+ }
+
+ // find out what pid has been assigned to us
+ socklen_t len = sizeof(addr);
+ if (::getsockname(fd, reinterpret_cast<sockaddr*>(&addr), &len) < 0) {
+ BOOST_THROW_EXCEPTION(Error("Cannot obtain netlink socket address ("s + std::strerror(errno) + ")"));
+ }
+ if (len != sizeof(addr)) {
+ BOOST_THROW_EXCEPTION(Error("Wrong address length (" + to_string(len) + ")"));
+ }
+ if (addr.nl_family != AF_NETLINK) {
+ BOOST_THROW_EXCEPTION(Error("Wrong address family (" + to_string(addr.nl_family) + ")"));
+ }
+ m_pid = addr.nl_pid;
+ NDN_LOG_TRACE("our pid is " << m_pid);
+
+#ifdef NDN_CXX_HAVE_NETLINK_EXT_ACK
+ // enable extended ACK reporting
+ const int one = 1;
+ if (::setsockopt(fd, SOL_NETLINK, NETLINK_EXT_ACK, &one, sizeof(one)) < 0) {
+ // not a fatal error
+ NDN_LOG_DEBUG("setting NETLINK_EXT_ACK failed: " << std::strerror(errno));
+ }
+#endif // NDN_CXX_HAVE_NETLINK_EXT_ACK
+}
+
+void
+NetworkMonitorImplNetlink::joinGroup(int group)
+{
+ if (::setsockopt(m_socket->native_handle(), SOL_NETLINK, NETLINK_ADD_MEMBERSHIP,
+ &group, sizeof(group)) < 0) {
+ BOOST_THROW_EXCEPTION(Error("Cannot join netlink group " + to_string(group) +
+ " (" + std::strerror(errno) + ")"));
+ }
+}
+
+void
+NetworkMonitorImplNetlink::sendDumpRequest(uint16_t nlmsgType)
+{
+ auto request = make_shared<RtnlRequest>();
+ request->nlh.nlmsg_len = sizeof(RtnlRequest);
+ request->nlh.nlmsg_type = nlmsgType;
+ request->nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+ request->nlh.nlmsg_seq = ++m_sequenceNo;
+ request->nlh.nlmsg_pid = m_pid;
+ request->ifi.ifi_family = AF_UNSPEC;
+ request->rta.rta_type = IFLA_EXT_MASK;
+ request->rta.rta_len = RTA_LENGTH(sizeof(request->rtext));
+ request->rtext = RTEXT_FILTER_SKIP_STATS;
+
+ boost::asio::async_write(*m_socket, boost::asio::buffer(request.get(), sizeof(RtnlRequest)),
+ // capture 'request' to prevent its premature deallocation
+ [request] (const boost::system::error_code& error, size_t) {
+ if (!error) {
+ auto type = request->nlh.nlmsg_type;
+ NDN_LOG_TRACE("sent dump request type=" << type << nlmsgTypeToString(type)
+ << " seq=" << request->nlh.nlmsg_seq);
+ }
+ else if (error != boost::asio::error::operation_aborted) {
+ NDN_LOG_ERROR("write failed: " << error.message());
+ BOOST_THROW_EXCEPTION(Error("Failed to send netlink request (" + error.message() + ")"));
+ }
+ });
+}
+
+void
+NetworkMonitorImplNetlink::asyncRead()
+{
+ m_socket->async_read_some(boost::asio::buffer(m_buffer),
+ // capture a copy of 'm_socket' to prevent its deallocation while the handler is still pending
+ [this, socket = m_socket] (auto&&... args) {
+ this->handleRead(std::forward<decltype(args)>(args)..., socket);
+ });
+}
+
+void
+NetworkMonitorImplNetlink::handleRead(const boost::system::error_code& error, size_t nBytesRead,
+ const shared_ptr<boost::asio::posix::stream_descriptor>& socket)
+{
+ if (!socket->is_open() ||
+ error == boost::asio::error::operation_aborted) {
+ // socket was closed, ignore the error
+ NDN_LOG_TRACE("socket closed or operation aborted");
+ return;
+ }
+ if (error) {
+ NDN_LOG_ERROR("read failed: " << error.message());
+ BOOST_THROW_EXCEPTION(Error("Netlink socket read failed (" + error.message() + ")"));
+ }
+
+ NDN_LOG_TRACE("read " << nBytesRead << " bytes from netlink socket");
+
+ NetlinkMessage nlmsg(m_buffer.data(), nBytesRead);
+ for (; nlmsg.isValid(); nlmsg = nlmsg.getNext()) {
+ NDN_LOG_TRACE("parsing " << (nlmsg->nlmsg_flags & NLM_F_MULTI ? "multi-part " : "") <<
+ "message type=" << nlmsg->nlmsg_type << nlmsgTypeToString(nlmsg->nlmsg_type) <<
+ " len=" << nlmsg->nlmsg_len <<
+ " seq=" << nlmsg->nlmsg_seq <<
+ " pid=" << nlmsg->nlmsg_pid);
+
+ if (isEnumerating() && (nlmsg->nlmsg_pid != m_pid || nlmsg->nlmsg_seq != m_sequenceNo)) {
+ NDN_LOG_TRACE("seq/pid mismatch, ignoring");
+ continue;
+ }
+
+ if (nlmsg->nlmsg_flags & NLM_F_DUMP_INTR) {
+ NDN_LOG_ERROR("netlink dump is inconsistent");
+ // TODO: discard the rest of the message and retry the dump
+ break;
+ }
+
+ if (nlmsg->nlmsg_type == NLMSG_DONE) {
+ break;
+ }
+
+ parseNetlinkMessage(nlmsg);
+ }
+
+ if (nlmsg->nlmsg_type == NLMSG_DONE) {
+ if (m_isEnumeratingLinks) {
+ // links enumeration complete, now request all the addresses
+ m_isEnumeratingLinks = false;
+ NDN_LOG_TRACE("enumerating addresses");
+ sendDumpRequest(RTM_GETADDR);
+ m_isEnumeratingAddresses = true;
+ }
+ else if (m_isEnumeratingAddresses) {
+ // links and addresses enumeration complete
+ m_isEnumeratingAddresses = false;
+ // TODO: enumerate routes
+ NDN_LOG_DEBUG("enumeration complete");
+ this->emitSignal(onEnumerationCompleted);
+ }
+ }
+
+ asyncRead();
+}
+
+void
+NetworkMonitorImplNetlink::parseNetlinkMessage(const NetlinkMessage& nlmsg)
+{
+ switch (nlmsg->nlmsg_type) {
+ case RTM_NEWLINK:
+ case RTM_DELLINK:
+ parseLinkMessage(nlmsg);
+ if (!isEnumerating())
+ this->emitSignal(onNetworkStateChanged); // backward compat
+ break;
+
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ parseAddressMessage(nlmsg);
+ if (!isEnumerating())
+ this->emitSignal(onNetworkStateChanged); // backward compat
+ break;
+
+ case RTM_NEWROUTE:
+ case RTM_DELROUTE:
+ parseRouteMessage(nlmsg);
+ if (!isEnumerating())
+ this->emitSignal(onNetworkStateChanged); // backward compat
+ break;
+
+ case NLMSG_ERROR:
+ parseErrorMessage(nlmsg);
+ break;
+ }
+}
+
+static InterfaceType
+ifiTypeToInterfaceType(uint16_t type)
+{
+ switch (type) {
+ case ARPHRD_ETHER:
+ return InterfaceType::ETHERNET;
+ case ARPHRD_LOOPBACK:
+ return InterfaceType::LOOPBACK;
+ default:
+ return InterfaceType::UNKNOWN;
+ }
+}
+
+static AddressFamily
+ifaFamilyToAddressFamily(uint8_t family)
+{
+ switch (family) {
+ case AF_INET:
+ return AddressFamily::V4;
+ case AF_INET6:
+ return AddressFamily::V6;
+ default:
+ return AddressFamily::UNSPECIFIED;
+ }
+}
+
+static AddressScope
+ifaScopeToAddressScope(uint8_t scope)
+{
+ switch (scope) {
+ case RT_SCOPE_NOWHERE:
+ return AddressScope::NOWHERE;
+ case RT_SCOPE_HOST:
+ return AddressScope::HOST;
+ case RT_SCOPE_LINK:
+ return AddressScope::LINK;
+ default:
+ return AddressScope::GLOBAL;
+ }
+}
+
+void
+NetworkMonitorImplNetlink::parseLinkMessage(const NetlinkMessage& nlmsg)
+{
+ const ifinfomsg* ifi = nlmsg.getPayload<ifinfomsg>();
+ if (ifi == nullptr) {
+ NDN_LOG_WARN("malformed ifinfomsg");
+ return;
+ }
+
+ if (ifiTypeToInterfaceType(ifi->ifi_type) == InterfaceType::UNKNOWN) {
+ NDN_LOG_DEBUG("unhandled interface type " << ifi->ifi_type);
+ return;
+ }
+
+ shared_ptr<NetworkInterface> interface;
+ auto it = m_interfaces.find(ifi->ifi_index);
+ if (it != m_interfaces.end()) {
+ interface = it->second;
+ BOOST_ASSERT(interface != nullptr);
+ BOOST_ASSERT(interface->getIndex() == ifi->ifi_index);
+ }
+
+ if (nlmsg->nlmsg_type == RTM_DELLINK) {
+ if (interface != nullptr) {
+ NDN_LOG_DEBUG("removing interface " << interface->getName());
+ m_interfaces.erase(it);
+ this->emitSignal(onInterfaceRemoved, interface);
+ }
+ return;
+ }
+
+ if (interface == nullptr) {
+ interface = makeNetworkInterface();
+ interface->setIndex(ifi->ifi_index);
+ }
+ interface->setType(ifiTypeToInterfaceType(ifi->ifi_type));
+ interface->setFlags(ifi->ifi_flags);
+
+ auto attrs = nlmsg.getAttributes<rtattr>(ifi);
+ NDN_LOG_TRACE("message contains " << attrs.size() << " attributes");
+
+ auto address = attrs.getAttributeByType<ethernet::Address>(IFLA_ADDRESS);
+ if (address)
+ interface->setEthernetAddress(*address);
+
+ auto broadcast = attrs.getAttributeByType<ethernet::Address>(IFLA_BROADCAST);
+ if (broadcast)
+ interface->setEthernetBroadcastAddress(*broadcast);
+
+ auto name = attrs.getAttributeByType<std::string>(IFLA_IFNAME);
+ if (name)
+ interface->setName(*name);
+
+ auto mtu = attrs.getAttributeByType<uint32_t>(IFLA_MTU);
+ if (mtu)
+ interface->setMtu(*mtu);
+
+ auto state = attrs.getAttributeByType<uint8_t>(IFLA_OPERSTATE);
+ updateInterfaceState(*interface, state ? *state : linux_if::OPER_STATE_UNKNOWN);
+
+ if (it == m_interfaces.end()) {
+ NDN_LOG_DEBUG("adding interface " << interface->getName());
+ m_interfaces[interface->getIndex()] = interface;
+ this->emitSignal(onInterfaceAdded, interface);
+ }
+}
+
+void
+NetworkMonitorImplNetlink::parseAddressMessage(const NetlinkMessage& nlmsg)
+{
+ const ifaddrmsg* ifa = nlmsg.getPayload<ifaddrmsg>();
+ if (ifa == nullptr) {
+ NDN_LOG_WARN("malformed ifaddrmsg");
+ return;
+ }
+
+ auto it = m_interfaces.find(ifa->ifa_index);
+ if (it == m_interfaces.end()) {
+ // unknown interface, ignore message
+ NDN_LOG_TRACE("unknown interface index " << ifa->ifa_index);
+ return;
+ }
+ auto interface = it->second;
+ BOOST_ASSERT(interface != nullptr);
+
+ auto attrs = nlmsg.getAttributes<rtattr>(ifa);
+ NDN_LOG_TRACE("message contains " << attrs.size() << " attributes");
+
+ namespace ip = boost::asio::ip;
+ ip::address ipAddr, broadcastAddr;
+ if (ifa->ifa_family == AF_INET) {
+ auto v4 = attrs.getAttributeByType<ip::address_v4>(IFA_LOCAL);
+ if (v4)
+ ipAddr = *v4;
+
+ v4 = attrs.getAttributeByType<ip::address_v4>(IFA_BROADCAST);
+ if (v4)
+ broadcastAddr = *v4;
+ }
+ else if (ifa->ifa_family == AF_INET6) {
+ auto v6 = attrs.getAttributeByType<ip::address_v6>(IFA_ADDRESS);
+ if (v6) {
+ if (v6->is_link_local())
+ v6->scope_id(ifa->ifa_index);
+
+ ipAddr = *v6;
+ }
+ }
+
+ uint32_t flags = ifa->ifa_flags; // overwritten by IFA_FLAGS if supported and present
+#ifdef NDN_CXX_HAVE_IFA_FLAGS
+ auto extFlags = attrs.getAttributeByType<uint32_t>(IFA_FLAGS);
+ if (extFlags)
+ flags = *extFlags;
+#endif // NDN_CXX_HAVE_IFA_FLAGS
+
+ NetworkAddress address(ifaFamilyToAddressFamily(ifa->ifa_family),
+ ipAddr,
+ broadcastAddr,
+ ifa->ifa_prefixlen,
+ ifaScopeToAddressScope(ifa->ifa_scope),
+ flags);
+ BOOST_ASSERT(address.getFamily() != AddressFamily::UNSPECIFIED);
+
+ if (nlmsg->nlmsg_type == RTM_NEWADDR)
+ interface->addNetworkAddress(address);
+ else if (nlmsg->nlmsg_type == RTM_DELADDR)
+ interface->removeNetworkAddress(address);
+}
+
+void
+NetworkMonitorImplNetlink::parseRouteMessage(const NetlinkMessage& nlmsg)
+{
+ // TODO
+}
+
+void
+NetworkMonitorImplNetlink::parseErrorMessage(const NetlinkMessage& nlmsg)
+{
+ const nlmsgerr* err = nlmsg.getPayload<nlmsgerr>();
+ if (err == nullptr) {
+ NDN_LOG_WARN("malformed nlmsgerr");
+ return;
+ }
+
+ if (err->error == 0) {
+ // an error code of zero indicates an ACK message, not an error
+ NDN_LOG_TRACE("ACK");
+ return;
+ }
+
+ NDN_LOG_ERROR("NLMSG_ERROR: " << std::strerror(std::abs(err->error)));
+
+#ifdef NDN_CXX_HAVE_NETLINK_EXT_ACK
+ if (!(nlmsg->nlmsg_flags & NLM_F_ACK_TLVS))
+ return;
+
+ size_t errLen = NLMSG_LENGTH(sizeof(nlmsgerr));
+ if (!(nlmsg->nlmsg_flags & NLM_F_CAPPED))
+ errLen += err->msg.nlmsg_len - NLMSG_HDRLEN; // don't count the inner nlmsghdr twice
+
+ if (nlmsg->nlmsg_len <= errLen)
+ return;
+
+ auto nla = reinterpret_cast<const nlattr*>(reinterpret_cast<const uint8_t*>(&*nlmsg) + errLen);
+ auto attrs = NetlinkMessageAttributes<nlattr>(nla, nlmsg->nlmsg_len - errLen);
+ auto msg = attrs.getAttributeByType<std::string>(NLMSGERR_ATTR_MSG);
+ if (msg)
+ NDN_LOG_ERROR("kernel message: " << *msg);
+#endif // NDN_CXX_HAVE_NETLINK_EXT_ACK
+}
+
+void
+NetworkMonitorImplNetlink::updateInterfaceState(NetworkInterface& interface, uint8_t operState)
+{
+ if (operState == linux_if::OPER_STATE_UP) {
+ interface.setState(InterfaceState::RUNNING);
+ }
+ else if (operState == linux_if::OPER_STATE_DORMANT) {
+ interface.setState(InterfaceState::DORMANT);
+ }
+ else {
+ // fallback to flags
+ auto flags = interface.getFlags();
+ if ((flags & linux_if::FLAG_LOWER_UP) && !(flags & linux_if::FLAG_DORMANT))
+ interface.setState(InterfaceState::RUNNING);
+ else if (flags & IFF_UP)
+ interface.setState(InterfaceState::NO_CARRIER);
+ else
+ interface.setState(InterfaceState::DOWN);
+ }
+}
+
+} // namespace net
+} // namespace ndn
diff --git a/src/net/detail/network-monitor-impl-rtnl.hpp b/src/net/detail/network-monitor-impl-netlink.hpp
similarity index 74%
rename from src/net/detail/network-monitor-impl-rtnl.hpp
rename to src/net/detail/network-monitor-impl-netlink.hpp
index ce15dd5..a61c546 100644
--- a/src/net/detail/network-monitor-impl-rtnl.hpp
+++ b/src/net/detail/network-monitor-impl-netlink.hpp
@@ -1,6 +1,6 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2013-2017 Regents of the University of California.
+/*
+ * Copyright (c) 2013-2018 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
@@ -21,14 +21,14 @@
* @author Davide Pesavento <davide.pesavento@lip6.fr>
*/
-#ifndef NDN_NET_NETWORK_MONITOR_IMPL_RTNL_HPP
-#define NDN_NET_NETWORK_MONITOR_IMPL_RTNL_HPP
+#ifndef NDN_NET_NETWORK_MONITOR_IMPL_NETLINK_HPP
+#define NDN_NET_NETWORK_MONITOR_IMPL_NETLINK_HPP
#include "ndn-cxx-config.hpp"
#include "../network-monitor.hpp"
#ifndef NDN_CXX_HAVE_RTNETLINK
-#error "This file should not be compiled ..."
+#error "This file should not be included ..."
#endif
#include <boost/asio/posix/stream_descriptor.hpp>
@@ -36,15 +36,12 @@
#include <array>
#include <map>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-#include <linux/if_addr.h>
-#include <linux/if_link.h>
-
namespace ndn {
namespace net {
-class NetworkMonitorImplRtnl : public NetworkMonitorImpl
+class NetlinkMessage;
+
+class NetworkMonitorImplNetlink : public NetworkMonitorImpl
{
public:
using Error = NetworkMonitor::Error;
@@ -52,9 +49,9 @@
/** \brief initialize netlink socket and start enumerating interfaces
*/
explicit
- NetworkMonitorImplRtnl(boost::asio::io_service& io);
+ NetworkMonitorImplNetlink(boost::asio::io_service& io);
- ~NetworkMonitorImplRtnl();
+ ~NetworkMonitorImplNetlink();
uint32_t
getCapabilities() const final
@@ -73,19 +70,14 @@
listNetworkInterfaces() const final;
private:
- struct RtnlRequest
- {
- nlmsghdr nlh;
- ifinfomsg ifi;
- rtattr rta __attribute__((aligned(NLMSG_ALIGNTO))); // rtattr has to be aligned
- uint32_t rtext; // space for IFLA_EXT_MASK
- };
-
bool
isEnumerating() const;
void
- initSocket();
+ initSocket(int family);
+
+ void
+ joinGroup(int group);
void
sendDumpRequest(uint16_t nlmsgType);
@@ -98,16 +90,19 @@
const shared_ptr<boost::asio::posix::stream_descriptor>& socket);
void
- parseNetlinkMessage(const nlmsghdr* nlh, size_t len);
+ parseNetlinkMessage(const NetlinkMessage& nlmsg);
void
- parseLinkMessage(const nlmsghdr* nlh, const ifinfomsg* ifi);
+ parseLinkMessage(const NetlinkMessage& nlmsg);
void
- parseAddressMessage(const nlmsghdr* nlh, const ifaddrmsg* ifa);
+ parseAddressMessage(const NetlinkMessage& nlmsg);
void
- parseRouteMessage(const nlmsghdr* nlh, const rtmsg* rtm);
+ parseRouteMessage(const NetlinkMessage& nlmsg);
+
+ void
+ parseErrorMessage(const NetlinkMessage& nlmsg);
static void
updateInterfaceState(NetworkInterface& interface, uint8_t operState);
@@ -125,4 +120,4 @@
} // namespace net
} // namespace ndn
-#endif // NDN_NET_NETWORK_MONITOR_IMPL_RTNL_HPP
+#endif // NDN_NET_NETWORK_MONITOR_IMPL_NETLINK_HPP
diff --git a/src/net/detail/network-monitor-impl-osx.hpp b/src/net/detail/network-monitor-impl-osx.hpp
index 93cd57a..f536b5d 100644
--- a/src/net/detail/network-monitor-impl-osx.hpp
+++ b/src/net/detail/network-monitor-impl-osx.hpp
@@ -26,7 +26,7 @@
#include "../network-monitor.hpp"
#ifndef NDN_CXX_HAVE_OSX_FRAMEWORKS
-#error "This file should not be compiled ..."
+#error "This file should not be included ..."
#endif
#include "../../util/cf-releaser-osx.hpp"
diff --git a/src/net/detail/network-monitor-impl-rtnl.cpp b/src/net/detail/network-monitor-impl-rtnl.cpp
deleted file mode 100644
index ab797db..0000000
--- a/src/net/detail/network-monitor-impl-rtnl.cpp
+++ /dev/null
@@ -1,511 +0,0 @@
-/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/*
- * Copyright (c) 2013-2018 Regents of the University of California.
- *
- * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
- *
- * ndn-cxx library is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received copies of the GNU General Public License and GNU Lesser
- * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
- * <http://www.gnu.org/licenses/>.
- *
- * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
- *
- * @author Davide Pesavento <davide.pesavento@lip6.fr>
- */
-
-#include "network-monitor-impl-rtnl.hpp"
-#include "linux-if-constants.hpp"
-#include "../network-address.hpp"
-#include "../network-interface.hpp"
-#include "../../util/logger.hpp"
-#include "../../util/time.hpp"
-
-#include <boost/asio/write.hpp>
-
-#include <cerrno>
-#include <cstdlib>
-#include <net/if_arp.h>
-#include <sys/socket.h>
-
-NDN_LOG_INIT(ndn.NetworkMonitor);
-
-namespace ndn {
-namespace net {
-
-NetworkMonitorImplRtnl::NetworkMonitorImplRtnl(boost::asio::io_service& io)
- : m_socket(make_shared<boost::asio::posix::stream_descriptor>(io))
- , m_pid(0)
- , m_sequenceNo(static_cast<uint32_t>(time::system_clock::now().time_since_epoch().count()))
- , m_isEnumeratingLinks(false)
- , m_isEnumeratingAddresses(false)
-{
- initSocket();
- asyncRead();
-
- NDN_LOG_TRACE("enumerating links");
- sendDumpRequest(RTM_GETLINK);
- m_isEnumeratingLinks = true;
-}
-
-NetworkMonitorImplRtnl::~NetworkMonitorImplRtnl()
-{
- boost::system::error_code error;
- m_socket->close(error);
-}
-
-shared_ptr<const NetworkInterface>
-NetworkMonitorImplRtnl::getNetworkInterface(const std::string& ifname) const
-{
- for (const auto& e : m_interfaces) {
- if (e.second->getName() == ifname)
- return e.second;
- }
- return nullptr;
-}
-
-std::vector<shared_ptr<const NetworkInterface>>
-NetworkMonitorImplRtnl::listNetworkInterfaces() const
-{
- std::vector<shared_ptr<const NetworkInterface>> v;
- v.reserve(m_interfaces.size());
-
- for (const auto& e : m_interfaces) {
- v.push_back(e.second);
- }
- return v;
-}
-
-bool
-NetworkMonitorImplRtnl::isEnumerating() const
-{
- return m_isEnumeratingLinks || m_isEnumeratingAddresses;
-}
-
-void
-NetworkMonitorImplRtnl::initSocket()
-{
- NDN_LOG_TRACE("creating netlink socket");
-
- int fd = ::socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
- if (fd < 0) {
- BOOST_THROW_EXCEPTION(Error("Cannot create netlink socket ("s + std::strerror(errno) + ")"));
- }
- m_socket->assign(fd);
-
- sockaddr_nl addr{};
- addr.nl_family = AF_NETLINK;
- addr.nl_groups = RTMGRP_LINK | RTMGRP_NOTIFY |
- RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE |
- RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE;
- if (::bind(fd, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0) {
- BOOST_THROW_EXCEPTION(Error("Cannot bind netlink socket ("s + std::strerror(errno) + ")"));
- }
-
- // find out what pid has been assigned to us
- socklen_t len = sizeof(addr);
- if (::getsockname(fd, reinterpret_cast<sockaddr*>(&addr), &len) < 0) {
- BOOST_THROW_EXCEPTION(Error("Cannot obtain netlink socket address ("s + std::strerror(errno) + ")"));
- }
- if (len != sizeof(addr)) {
- BOOST_THROW_EXCEPTION(Error("Wrong address length (" + to_string(len) + ")"));
- }
- if (addr.nl_family != AF_NETLINK) {
- BOOST_THROW_EXCEPTION(Error("Wrong address family (" + to_string(addr.nl_family) + ")"));
- }
- m_pid = addr.nl_pid;
- NDN_LOG_TRACE("our pid is " << m_pid);
-}
-
-void
-NetworkMonitorImplRtnl::sendDumpRequest(uint16_t nlmsgType)
-{
- auto request = make_shared<RtnlRequest>();
- request->nlh.nlmsg_len = sizeof(RtnlRequest);
- request->nlh.nlmsg_type = nlmsgType;
- request->nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
- request->nlh.nlmsg_seq = ++m_sequenceNo;
- request->nlh.nlmsg_pid = m_pid;
- request->ifi.ifi_family = AF_UNSPEC;
- request->rta.rta_type = IFLA_EXT_MASK;
- request->rta.rta_len = RTA_LENGTH(sizeof(request->rtext));
- request->rtext = 1 << 3; // RTEXT_FILTER_SKIP_STATS
-
- boost::asio::async_write(*m_socket, boost::asio::buffer(request.get(), sizeof(RtnlRequest)),
- // capture 'request' to prevent its premature deallocation
- [request] (const boost::system::error_code& error, size_t) {
- if (error && error != boost::asio::error::operation_aborted) {
- NDN_LOG_ERROR("write failed: " << error.message());
- BOOST_THROW_EXCEPTION(Error("Failed to send netlink request (" + error.message() + ")"));
- }
- });
-}
-
-static const char*
-nlmsgTypeToString(uint16_t type)
-{
-#define NLMSG_STRINGIFY(x) case NLMSG_##x: return "<" #x ">"
-#define RTM_STRINGIFY(x) case RTM_##x: return "<" #x ">"
- switch (type) {
- NLMSG_STRINGIFY(NOOP);
- NLMSG_STRINGIFY(ERROR);
- NLMSG_STRINGIFY(DONE);
- NLMSG_STRINGIFY(OVERRUN);
- RTM_STRINGIFY(NEWLINK);
- RTM_STRINGIFY(DELLINK);
- RTM_STRINGIFY(NEWADDR);
- RTM_STRINGIFY(DELADDR);
- RTM_STRINGIFY(NEWROUTE);
- RTM_STRINGIFY(DELROUTE);
- default:
- return "";
- }
-#undef NLMSG_STRINGIFY
-#undef RTM_STRINGIFY
-}
-
-static InterfaceType
-ifiTypeToInterfaceType(uint16_t type)
-{
- switch (type) {
- case ARPHRD_ETHER:
- return InterfaceType::ETHERNET;
- case ARPHRD_LOOPBACK:
- return InterfaceType::LOOPBACK;
- default:
- return InterfaceType::UNKNOWN;
- }
-}
-
-static AddressFamily
-ifaFamilyToAddressFamily(uint8_t family)
-{
- switch (family) {
- case AF_INET:
- return AddressFamily::V4;
- case AF_INET6:
- return AddressFamily::V6;
- default:
- return AddressFamily::UNSPECIFIED;
- }
-}
-
-static AddressScope
-ifaScopeToAddressScope(uint8_t scope)
-{
- switch (scope) {
- case RT_SCOPE_NOWHERE:
- return AddressScope::NOWHERE;
- case RT_SCOPE_HOST:
- return AddressScope::HOST;
- case RT_SCOPE_LINK:
- return AddressScope::LINK;
- default:
- return AddressScope::GLOBAL;
- }
-}
-
-void
-NetworkMonitorImplRtnl::asyncRead()
-{
- m_socket->async_read_some(boost::asio::buffer(m_buffer),
- bind(&NetworkMonitorImplRtnl::handleRead, this, _1, _2, m_socket));
-}
-
-void
-NetworkMonitorImplRtnl::handleRead(const boost::system::error_code& error, size_t nBytesRead,
- const shared_ptr<boost::asio::posix::stream_descriptor>& socket)
-{
- if (!socket->is_open() ||
- error == boost::asio::error::operation_aborted) {
- // socket was closed, ignore the error
- NDN_LOG_TRACE("socket closed or operation aborted");
- return;
- }
- if (error) {
- NDN_LOG_ERROR("read failed: " << error.message());
- BOOST_THROW_EXCEPTION(Error("Netlink socket read failed (" + error.message() + ")"));
- }
-
- NDN_LOG_TRACE("read " << nBytesRead << " bytes from netlink socket");
-
- const nlmsghdr* nlh = reinterpret_cast<const nlmsghdr*>(m_buffer.data());
- if (!isEnumerating() || (nlh->nlmsg_seq == m_sequenceNo && nlh->nlmsg_pid == m_pid)) {
- parseNetlinkMessage(nlh, nBytesRead);
- }
- else {
- NDN_LOG_TRACE("seq/pid mismatch, ignoring");
- }
-
- asyncRead();
-}
-
-void
-NetworkMonitorImplRtnl::parseNetlinkMessage(const nlmsghdr* nlh, size_t len)
-{
- while (NLMSG_OK(nlh, len)) {
- NDN_LOG_TRACE("parsing " << (nlh->nlmsg_flags & NLM_F_MULTI ? "multi-part " : "") <<
- "message type=" << nlh->nlmsg_type << nlmsgTypeToString(nlh->nlmsg_type) <<
- " len=" << nlh->nlmsg_len <<
- " seq=" << nlh->nlmsg_seq <<
- " pid=" << nlh->nlmsg_pid);
-
- if (nlh->nlmsg_flags & NLM_F_DUMP_INTR) {
- NDN_LOG_ERROR("netlink dump was interrupted");
- // TODO: technically we should retry the dump...
- break;
- }
-
- if (nlh->nlmsg_type == NLMSG_DONE)
- break;
-
- switch (nlh->nlmsg_type) {
- case RTM_NEWLINK:
- case RTM_DELLINK:
- parseLinkMessage(nlh, reinterpret_cast<const ifinfomsg*>(NLMSG_DATA(nlh)));
- if (!isEnumerating())
- this->emitSignal(onNetworkStateChanged); // backward compat
- break;
-
- case RTM_NEWADDR:
- case RTM_DELADDR:
- parseAddressMessage(nlh, reinterpret_cast<const ifaddrmsg*>(NLMSG_DATA(nlh)));
- if (!isEnumerating())
- this->emitSignal(onNetworkStateChanged); // backward compat
- break;
-
- case RTM_NEWROUTE:
- case RTM_DELROUTE:
- parseRouteMessage(nlh, reinterpret_cast<const rtmsg*>(NLMSG_DATA(nlh)));
- if (!isEnumerating())
- this->emitSignal(onNetworkStateChanged); // backward compat
- break;
-
- case NLMSG_ERROR: {
- const nlmsgerr* err = reinterpret_cast<const nlmsgerr*>(NLMSG_DATA(nlh));
- if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(nlmsgerr)))
- NDN_LOG_ERROR("truncated NLMSG_ERROR");
- else if (err->error == 0)
- // an error code of zero indicates an ACK message, not an error
- NDN_LOG_TRACE("ACK");
- else
- NDN_LOG_ERROR("NLMSG_ERROR: " << std::strerror(std::abs(err->error)));
- break;
- }
- }
-
- nlh = NLMSG_NEXT(nlh, len);
- }
-
- if (nlh->nlmsg_type == NLMSG_DONE && m_isEnumeratingLinks) {
- // links enumeration complete, now request all the addresses
- m_isEnumeratingLinks = false;
- NDN_LOG_TRACE("enumerating addresses");
- sendDumpRequest(RTM_GETADDR);
- m_isEnumeratingAddresses = true;
- }
- else if (nlh->nlmsg_type == NLMSG_DONE && m_isEnumeratingAddresses) {
- // links and addresses enumeration complete
- m_isEnumeratingAddresses = false;
- // TODO: enumerate routes
- NDN_LOG_DEBUG("enumeration complete");
- this->emitSignal(onEnumerationCompleted);
- }
-}
-
-void
-NetworkMonitorImplRtnl::parseLinkMessage(const nlmsghdr* nlh, const ifinfomsg* ifi)
-{
- if (ifiTypeToInterfaceType(ifi->ifi_type) == InterfaceType::UNKNOWN) {
- NDN_LOG_DEBUG("unhandled interface type " << ifi->ifi_type);
- return;
- }
-
- shared_ptr<NetworkInterface> interface;
- auto it = m_interfaces.find(ifi->ifi_index);
- if (it != m_interfaces.end()) {
- interface = it->second;
- BOOST_ASSERT(interface != nullptr);
- BOOST_ASSERT(interface->getIndex() == ifi->ifi_index);
- }
-
- if (nlh->nlmsg_type == RTM_DELLINK) {
- if (interface != nullptr) {
- NDN_LOG_DEBUG("removing interface " << interface->getName());
- m_interfaces.erase(it);
- this->emitSignal(onInterfaceRemoved, interface);
- }
- return;
- }
-
- if (interface == nullptr) {
- interface = makeNetworkInterface();
- interface->setIndex(ifi->ifi_index);
- }
- interface->setType(ifiTypeToInterfaceType(ifi->ifi_type));
- interface->setFlags(ifi->ifi_flags);
-
- const rtattr* rta = reinterpret_cast<const rtattr*>(IFLA_RTA(ifi));
- size_t rtaTotalLen = IFLA_PAYLOAD(nlh);
- uint8_t operState = linux_if::OPER_STATE_UNKNOWN;
-
- while (RTA_OK(rta, rtaTotalLen)) {
- size_t attrLen = RTA_PAYLOAD(rta);
-
- switch (rta->rta_type) {
- case IFLA_ADDRESS:
- if (attrLen == ethernet::ADDR_LEN) {
- ethernet::Address addr(reinterpret_cast<const uint8_t*>(RTA_DATA(rta)));
- interface->setEthernetAddress(addr);
- }
- break;
-
- case IFLA_BROADCAST:
- if (attrLen == ethernet::ADDR_LEN) {
- ethernet::Address addr(reinterpret_cast<const uint8_t*>(RTA_DATA(rta)));
- interface->setEthernetBroadcastAddress(addr);
- }
- break;
-
- case IFLA_IFNAME: {
- auto attrData = reinterpret_cast<const char*>(RTA_DATA(rta));
- if (::strnlen(attrData, attrLen) <= attrLen)
- interface->setName(attrData);
- break;
- }
-
- case IFLA_MTU:
- if (attrLen == sizeof(uint32_t))
- interface->setMtu(*(reinterpret_cast<const uint32_t*>(RTA_DATA(rta))));
- break;
-
- case IFLA_OPERSTATE:
- if (attrLen == sizeof(uint8_t))
- operState = *(reinterpret_cast<const uint8_t*>RTA_DATA(rta));
- break;
- }
-
- rta = RTA_NEXT(rta, rtaTotalLen);
- }
-
- updateInterfaceState(*interface, operState);
-
- if (it == m_interfaces.end()) {
- NDN_LOG_DEBUG("adding interface " << interface->getName());
- m_interfaces[interface->getIndex()] = interface;
- this->emitSignal(onInterfaceAdded, interface);
- }
-}
-
-void
-NetworkMonitorImplRtnl::parseAddressMessage(const nlmsghdr* nlh, const ifaddrmsg* ifa)
-{
- auto it = m_interfaces.find(ifa->ifa_index);
- if (it == m_interfaces.end()) {
- // unknown interface, ignore message
- NDN_LOG_TRACE("unknown interface index " << ifa->ifa_index);
- return;
- }
- auto interface = it->second;
- BOOST_ASSERT(interface != nullptr);
-
- namespace ip = boost::asio::ip;
- ip::address ipAddr, broadcastAddr;
- uint32_t flags = ifa->ifa_flags; // will be overridden by IFA_FLAGS if the attribute is present
-
- const rtattr* rta = reinterpret_cast<const rtattr*>(IFA_RTA(ifa));
- size_t rtaTotalLen = IFA_PAYLOAD(nlh);
-
- while (RTA_OK(rta, rtaTotalLen)) {
- auto attrData = reinterpret_cast<const unsigned char*>(RTA_DATA(rta));
- size_t attrLen = RTA_PAYLOAD(rta);
-
- switch (rta->rta_type) {
- case IFA_LOCAL:
- if (ifa->ifa_family == AF_INET && attrLen == sizeof(ip::address_v4::bytes_type)) {
- ip::address_v4::bytes_type bytes;
- std::copy_n(attrData, bytes.size(), bytes.begin());
- ipAddr = ip::address_v4(bytes);
- }
- break;
-
- case IFA_ADDRESS:
- if (ifa->ifa_family == AF_INET6 && attrLen == sizeof(ip::address_v6::bytes_type)) {
- ip::address_v6::bytes_type bytes;
- std::copy_n(attrData, bytes.size(), bytes.begin());
- ip::address_v6 v6Addr(bytes);
- if (v6Addr.is_link_local())
- v6Addr.scope_id(ifa->ifa_index);
- ipAddr = v6Addr;
- }
- break;
-
- case IFA_BROADCAST:
- if (ifa->ifa_family == AF_INET && attrLen == sizeof(ip::address_v4::bytes_type)) {
- ip::address_v4::bytes_type bytes;
- std::copy_n(attrData, bytes.size(), bytes.begin());
- broadcastAddr = ip::address_v4(bytes);
- }
- break;
-
-#ifdef NDN_CXX_HAVE_IFA_FLAGS
- case IFA_FLAGS:
- if (attrLen == sizeof(uint32_t))
- flags = *(reinterpret_cast<const uint32_t*>(attrData));
- break;
-#endif // NDN_CXX_HAVE_IFA_FLAGS
- }
-
- rta = RTA_NEXT(rta, rtaTotalLen);
- }
-
- NetworkAddress address(ifaFamilyToAddressFamily(ifa->ifa_family),
- ipAddr,
- broadcastAddr,
- ifa->ifa_prefixlen,
- ifaScopeToAddressScope(ifa->ifa_scope),
- flags);
- BOOST_ASSERT(address.getFamily() != AddressFamily::UNSPECIFIED);
-
- if (nlh->nlmsg_type == RTM_NEWADDR)
- interface->addNetworkAddress(address);
- else if (nlh->nlmsg_type == RTM_DELADDR)
- interface->removeNetworkAddress(address);
-}
-
-void
-NetworkMonitorImplRtnl::parseRouteMessage(const nlmsghdr* nlh, const rtmsg* rtm)
-{
- // TODO
-}
-
-void
-NetworkMonitorImplRtnl::updateInterfaceState(NetworkInterface& interface, uint8_t operState)
-{
- if (operState == linux_if::OPER_STATE_UP) {
- interface.setState(InterfaceState::RUNNING);
- }
- else if (operState == linux_if::OPER_STATE_DORMANT) {
- interface.setState(InterfaceState::DORMANT);
- }
- else {
- // fallback to flags
- auto flags = interface.getFlags();
- if ((flags & linux_if::FLAG_LOWER_UP) && !(flags & linux_if::FLAG_DORMANT))
- interface.setState(InterfaceState::RUNNING);
- else if (flags & IFF_UP)
- interface.setState(InterfaceState::NO_CARRIER);
- else
- interface.setState(InterfaceState::DOWN);
- }
-}
-
-} // namespace net
-} // namespace ndn