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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/can.h>
#include "common.h"
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include <libnl++/MessageFactory.h>
#include <libnl++/Socket.h>
#include <linux/can.h>
#include <linux/can/error.h>
#include <linux/can/netlink.h>
#include <linux/can/raw.h>
#include <linux/rtnetlink.h>
namespace android::netdevice::can {
static constexpr can_err_mask_t kErrMask = CAN_ERR_MASK;
base::unique_fd socket(const std::string& ifname) {
sockaddr_can addr = {};
addr.can_family = AF_CAN;
addr.can_ifindex = nametoindex(ifname);
if (addr.can_ifindex == 0) {
LOG(ERROR) << "Interface " << ifname << " doesn't exists";
return {};
}
base::unique_fd sock(::socket(PF_CAN, SOCK_RAW, CAN_RAW));
if (!sock.ok()) {
LOG(ERROR) << "Failed to create CAN socket";
return {};
}
if (setsockopt(sock.get(), SOL_CAN_RAW, CAN_RAW_ERR_FILTER, &kErrMask, sizeof(kErrMask)) < 0) {
PLOG(ERROR) << "Can't receive error frames, CAN setsockpt failed";
return {};
}
if (0 != fcntl(sock.get(), F_SETFL, O_RDWR | O_NONBLOCK)) {
LOG(ERROR) << "Couldn't put CAN socket in non-blocking mode";
return {};
}
if (0 != bind(sock.get(), reinterpret_cast<sockaddr*>(&addr), sizeof(addr))) {
LOG(ERROR) << "Can't bind to CAN interface " << ifname;
return {};
}
return sock;
}
bool setBitrate(std::string ifname, uint32_t bitrate) {
can_bittiming bt = {};
bt.bitrate = bitrate;
nl::MessageFactory<ifinfomsg> req(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_ACK);
req->ifi_index = nametoindex(ifname);
if (req->ifi_index == 0) {
LOG(ERROR) << "Can't find interface " << ifname;
return false;
}
{
auto linkinfo = req.addNested(IFLA_LINKINFO);
req.add(IFLA_INFO_KIND, "can");
{
auto infodata = req.addNested(IFLA_INFO_DATA);
/* For CAN FD, it would require to add IFLA_CAN_DATA_BITTIMING
* and IFLA_CAN_CTRLMODE as well. */
req.add(IFLA_CAN_BITTIMING, bt);
}
}
nl::Socket sock(NETLINK_ROUTE);
return sock.send(req) && sock.receiveAck(req);
}
} // namespace android::netdevice::can
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