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/*
Copyright (C) 2018 Srivats P.
This file is part of "Ostinato"
This is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
#include "linuxhostdevice.h"
#ifdef Q_OS_LINUX
#include "../common/qtport.h"
#include <QHostAddress>
#include <netlink/route/link.h>
#include <netlink/route/neighbour.h>
LinuxHostDevice::LinuxHostDevice(QString portName,
DeviceManager *deviceManager)
: Device(deviceManager)
{
ifName_ = portName;
netSock_ = nl_socket_alloc();
if (!netSock_) {
qWarning("Failed to open netlink socket for %s", qPrintable(ifName_));
return;
}
if (nl_connect(netSock_, NETLINK_ROUTE) < 0) {
qWarning("Failed to connect netlink socket for %s", qPrintable(ifName_));
return;
}
rtnl_link *link;
if (rtnl_link_get_kernel(netSock_, 0, qPrintable(ifName_), &link) < 0) {
qWarning("Failed to get rtnet link from kernel for %s", qPrintable(ifName_));
return;
}
ifIndex_ = rtnl_link_get_ifindex(link);
qDebug("Port %s: ifIndex %d", qPrintable(ifName_), ifIndex_);
rtnl_link_put(link);
}
void LinuxHostDevice::receivePacket(PacketBuffer* /*pktBuf*/)
{
// Do Nothing
}
void LinuxHostDevice::clearNeighbors(Device::NeighborSet set)
{
// No need to do anything - see AbstractPort::resolveDeviceNeighbors()
// on when this is used
if (set == kUnresolvedNeighbors)
return;
nl_cache *neighCache;
if (rtnl_neigh_alloc_cache(netSock_, &neighCache) < 0) {
qWarning("Failed to get neigh cache from kernel");
return;
}
if (!neighCache) {
qWarning("Neigh cache empty");
return;
}
int count=0, fail=0;
rtnl_neigh *neigh = (rtnl_neigh*) nl_cache_get_first(neighCache);
while (neigh) {
if ((rtnl_neigh_get_ifindex(neigh) == ifIndex_)
&& (rtnl_neigh_get_family(neigh) == AF_INET
|| rtnl_neigh_get_family(neigh) == AF_INET6)
&& !(rtnl_neigh_get_state(neigh) & (NUD_PERMANENT|NUD_NOARP))) {
count++;
if (rtnl_neigh_delete(netSock_, neigh, 0) < 0)
fail++;
}
neigh = (rtnl_neigh*) nl_cache_get_next(OBJ_CAST(neigh));
}
nl_cache_put(neighCache);
qDebug("Flush ARP/ND table for ifIndex %u: %d/%d deleted",
ifIndex_, count - fail, count);
}
void LinuxHostDevice::getNeighbors(OstEmul::DeviceNeighborList *neighbors)
{
nl_cache *neighCache;
if (rtnl_neigh_alloc_cache(netSock_, &neighCache) < 0) {
qWarning("Failed to get neigh cache from kernel");
return;
}
if (!neighCache) {
qWarning("Neigh cache empty");
return;
}
rtnl_neigh *neigh = (rtnl_neigh*) nl_cache_get_first(neighCache);
while (neigh) {
if ((rtnl_neigh_get_ifindex(neigh) == ifIndex_)
&& !(rtnl_neigh_get_state(neigh) & NUD_NOARP)) {
if (rtnl_neigh_get_family(neigh) == AF_INET) {
OstEmul::ArpEntry *arp = neighbors->add_arp();
arp->set_ip4(qFromBigEndian<quint32>(
nl_addr_get_binary_addr(rtnl_neigh_get_dst(neigh))));
nl_addr *lladdr = rtnl_neigh_get_lladdr(neigh);
arp->set_mac(lladdr ?
qFromBigEndian<quint64>(
nl_addr_get_binary_addr(lladdr)) >> 16 :
0);
}
else if (rtnl_neigh_get_family(neigh) == AF_INET6) {
OstEmul::NdpEntry *ndp = neighbors->add_ndp();
ndp->mutable_ip6()->set_hi(qFromBigEndian<quint64>(
nl_addr_get_binary_addr(
rtnl_neigh_get_dst(neigh))));
ndp->mutable_ip6()->set_lo(qFromBigEndian<quint64>((const uchar*)
nl_addr_get_binary_addr(
rtnl_neigh_get_dst(neigh))+8));
nl_addr *lladdr = rtnl_neigh_get_lladdr(neigh);
ndp->set_mac(lladdr ?
qFromBigEndian<quint64>(
nl_addr_get_binary_addr(lladdr)) >> 16 :
0);
}
}
neigh = (rtnl_neigh*) nl_cache_get_next(OBJ_CAST(neigh));
}
nl_cache_put(neighCache);
}
quint64 LinuxHostDevice::arpLookup(quint32 ip)
{
quint64 mac = 0;
nl_cache *neighCache;
if (rtnl_neigh_alloc_cache(netSock_, &neighCache) < 0) {
qWarning("Failed to get neigh cache from kernel");
return mac;
}
if (!neighCache) {
qWarning("Neigh cache empty");
return mac;
}
quint32 ipBig = qToBigEndian(ip);
nl_addr *dst = nl_addr_build(AF_INET, &ipBig, sizeof(ipBig));
#if 0
//
// libnl 3.2.[15..21] have a bug in rtnl_neigh_get and fail to find entry
// https://github.com/tgraf/libnl/commit/8571f58f23763d8db7365d02c9b27832ad3d7005
//
rtnl_neigh *neigh = rtnl_neigh_get(neighCache, ifIndex_, dst);
if (neigh) {
mac = qFromBigEndian<quint64>(
nl_addr_get_binary_addr(rtnl_neigh_get_lladdr(neigh))) >> 16;
rtnl_neigh_put(neigh);
}
#else
rtnl_neigh *neigh = (rtnl_neigh*) nl_cache_get_first(neighCache);
while (neigh) {
if ((rtnl_neigh_get_ifindex(neigh) == ifIndex_)
&& (rtnl_neigh_get_family(neigh) == AF_INET)
&& !nl_addr_cmp(rtnl_neigh_get_dst(neigh), dst)) {
nl_addr *lladdr = rtnl_neigh_get_lladdr(neigh);
if (lladdr)
mac = qFromBigEndian<quint64>(
nl_addr_get_binary_addr(lladdr)) >> 16;
break;
}
neigh = (rtnl_neigh*) nl_cache_get_next(OBJ_CAST(neigh));
}
#endif
nl_addr_put(dst);
nl_cache_put(neighCache);
return mac;
}
quint64 LinuxHostDevice::ndpLookup(UInt128 ip)
{
quint64 mac = 0;
nl_cache *neighCache;
if (rtnl_neigh_alloc_cache(netSock_, &neighCache) < 0) {
qWarning("Failed to get neigh cache from kernel");
return mac;
}
if (!neighCache) {
qWarning("Neigh cache empty");
return mac;
}
nl_addr *dst = nl_addr_build(AF_INET6, ip.toArray(), 16);
#if 0
//
// libnl 3.2.[15..21] have a bug in rtnl_neigh_get and fail to find entry
// https://github.com/tgraf/libnl/commit/8571f58f23763d8db7365d02c9b27832ad3d7005
//
rtnl_neigh *neigh = rtnl_neigh_get(neighCache, ifIndex_, dst);
if (neigh) {
mac = qFromBigEndian<quint64>(
nl_addr_get_binary_addr(rtnl_neigh_get_lladdr(neigh))) >> 16;
rtnl_neigh_put(neigh);
}
#else
rtnl_neigh *neigh = (rtnl_neigh*) nl_cache_get_first(neighCache);
while (neigh) {
if ((rtnl_neigh_get_ifindex(neigh) == ifIndex_)
&& (rtnl_neigh_get_family(neigh) == AF_INET6)
&& !nl_addr_cmp(rtnl_neigh_get_dst(neigh), dst)) {
nl_addr *lladdr = rtnl_neigh_get_lladdr(neigh);
if (lladdr)
mac = qFromBigEndian<quint64>(
nl_addr_get_binary_addr(lladdr)) >> 16;
break;
}
neigh = (rtnl_neigh*) nl_cache_get_next(OBJ_CAST(neigh));
}
#endif
nl_addr_put(dst);
nl_cache_put(neighCache);
return mac;
}
void LinuxHostDevice::sendArpRequest(quint32 tgtIp)
{
quint32 ipBig = qToBigEndian(tgtIp);
nl_addr *dst = nl_addr_build(AF_INET, &ipBig, sizeof(ipBig));
rtnl_neigh *neigh = rtnl_neigh_alloc();
rtnl_neigh_set_ifindex(neigh, ifIndex_);
rtnl_neigh_set_state(neigh, NUD_NONE);
rtnl_neigh_set_dst(neigh, dst);
rtnl_neigh_set_flags(neigh, NTF_USE); // force kernel to send ARP request
if (int err = rtnl_neigh_add(netSock_, neigh, NLM_F_CREATE) < 0)
qWarning("Resolve arp failed for port %s ip %08x: %s",
qPrintable(ifName_), tgtIp, strerror(err));
rtnl_neigh_put(neigh);
nl_addr_put(dst);
}
void LinuxHostDevice::sendNeighborSolicit(UInt128 tgtIp)
{
nl_addr *dst = nl_addr_build(AF_INET6, tgtIp.toArray(), 16);
rtnl_neigh *neigh = rtnl_neigh_alloc();
rtnl_neigh_set_ifindex(neigh, ifIndex_);
rtnl_neigh_set_state(neigh, NUD_NONE);
rtnl_neigh_set_dst(neigh, dst);
rtnl_neigh_set_flags(neigh, NTF_USE); // force kernel to send ARP request
if (int err = rtnl_neigh_add(netSock_, neigh, NLM_F_CREATE) < 0)
qWarning("Resolve ndp failed for port %s ip %016llx-%016llx: %s",
qPrintable(ifName_), tgtIp.hi64(), tgtIp.lo64(), strerror(err));
rtnl_neigh_put(neigh);
nl_addr_put(dst);
}
#endif
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