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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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 <libnetdevice/libnetdevice.h>
#include "common.h"
#include "ifreqs.h"
#include <android-base/logging.h>
#include <libnl++/MessageFactory.h>
#include <libnl++/Socket.h>
#include <linux/can.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
#include <sstream>
namespace android::netdevice {
void useSocketDomain(int domain) {
ifreqs::socketDomain = domain;
}
bool exists(std::string ifname) {
return nametoindex(ifname) != 0;
}
bool up(std::string ifname) {
auto ifr = ifreqs::fromName(ifname);
if (!ifreqs::send(SIOCGIFFLAGS, ifr)) return false;
ifr.ifr_flags |= IFF_UP;
return ifreqs::send(SIOCSIFFLAGS, ifr);
}
bool down(std::string ifname) {
auto ifr = ifreqs::fromName(ifname);
if (!ifreqs::send(SIOCGIFFLAGS, ifr)) return false;
ifr.ifr_flags &= ~IFF_UP;
return ifreqs::send(SIOCSIFFLAGS, ifr);
}
bool add(std::string dev, std::string type) {
nl::MessageFactory<ifinfomsg> req(RTM_NEWLINK,
NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK);
req.add(IFLA_IFNAME, dev);
{
auto linkinfo = req.addNested(IFLA_LINKINFO);
req.add(IFLA_INFO_KIND, type);
}
nl::Socket sock(NETLINK_ROUTE);
return sock.send(req) && sock.receiveAck(req);
}
bool del(std::string dev) {
nl::MessageFactory<ifinfomsg> req(RTM_DELLINK, NLM_F_REQUEST | NLM_F_ACK);
req.add(IFLA_IFNAME, dev);
nl::Socket sock(NETLINK_ROUTE);
return sock.send(req) && sock.receiveAck(req);
}
std::optional<hwaddr_t> getHwAddr(const std::string& ifname) {
auto ifr = ifreqs::fromName(ifname);
if (!ifreqs::send(SIOCGIFHWADDR, ifr)) return std::nullopt;
hwaddr_t hwaddr;
memcpy(hwaddr.data(), ifr.ifr_hwaddr.sa_data, hwaddr.size());
return hwaddr;
}
bool setHwAddr(const std::string& ifname, hwaddr_t hwaddr) {
auto ifr = ifreqs::fromName(ifname);
// fetch sa_family
if (!ifreqs::send(SIOCGIFHWADDR, ifr)) return false;
memcpy(ifr.ifr_hwaddr.sa_data, hwaddr.data(), hwaddr.size());
return ifreqs::send(SIOCSIFHWADDR, ifr);
}
std::optional<bool> isUp(std::string ifname) {
auto ifr = ifreqs::fromName(ifname);
if (!ifreqs::send(SIOCGIFFLAGS, ifr)) return std::nullopt;
return ifr.ifr_flags & IFF_UP;
}
struct WaitState {
bool present;
bool up;
bool satisfied(WaitCondition cnd) const {
switch (cnd) {
case WaitCondition::PRESENT:
if (present) return true;
break;
case WaitCondition::PRESENT_AND_UP:
if (present && up) return true;
break;
case WaitCondition::DOWN_OR_GONE:
if (!present || !up) return true;
break;
}
return false;
}
};
static std::string toString(WaitCondition cnd) {
switch (cnd) {
case WaitCondition::PRESENT:
return "become present";
case WaitCondition::PRESENT_AND_UP:
return "come up";
case WaitCondition::DOWN_OR_GONE:
return "go down";
}
}
static std::string toString(const std::set<std::string>& ifnames) {
std::stringstream ss;
std::copy(ifnames.begin(), ifnames.end(), std::ostream_iterator<std::string>(ss, ","));
auto str = ss.str();
str.pop_back();
return str;
}
void waitFor(std::set<std::string> ifnames, WaitCondition cnd, bool allOf) {
nl::Socket sock(NETLINK_ROUTE, 0, RTMGRP_LINK);
using StatesMap = std::map<std::string, WaitState>;
StatesMap states = {};
for (const auto ifname : ifnames) {
const auto present = exists(ifname);
const auto up = present && isUp(ifname).value_or(false);
states[ifname] = {present, up};
}
const auto mapConditionChecker = [cnd](const StatesMap::iterator::value_type& it) {
return it.second.satisfied(cnd);
};
const auto isFullySatisfied = [&states, allOf, mapConditionChecker]() {
if (allOf) {
return std::all_of(states.begin(), states.end(), mapConditionChecker);
} else {
return std::any_of(states.begin(), states.end(), mapConditionChecker);
}
};
if (isFullySatisfied()) return;
LOG(DEBUG) << "Waiting for " << (allOf ? "" : "any of ") << toString(ifnames) << " to "
<< toString(cnd);
for (const auto rawMsg : sock) {
const auto msg = nl::Message<ifinfomsg>::parse(rawMsg, {RTM_NEWLINK, RTM_DELLINK});
if (!msg.has_value()) continue;
const auto ifname = msg->attributes.get<std::string>(IFLA_IFNAME);
if (ifnames.count(ifname) == 0) continue;
const bool present = (msg->header.nlmsg_type != RTM_DELLINK);
const bool up = present && (msg->data.ifi_flags & IFF_UP) != 0;
states[ifname] = {present, up};
if (isFullySatisfied()) {
LOG(DEBUG) << "Finished waiting for " << (allOf ? "" : "some of ") << toString(ifnames)
<< " to " << toString(cnd);
return;
}
}
LOG(FATAL) << "Can't read Netlink socket";
}
} // namespace android::netdevice
bool operator==(const android::netdevice::hwaddr_t lhs, const unsigned char rhs[ETH_ALEN]) {
static_assert(lhs.size() == ETH_ALEN);
return 0 == memcmp(lhs.data(), rhs, lhs.size());
}
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