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Tomasz Wasilczyk87329672019-07-12 11:43:00 -07001/*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
Tomasz Wasilczykad107412020-05-29 16:32:43 -070017#include <libnetdevice/can.h>
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070018
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070019#include "common.h"
20
21#include <android-base/logging.h>
22#include <android-base/unique_fd.h>
Tomasz Wasilczyk66fc9392020-08-03 10:22:52 -070023#include <libnl++/MessageFactory.h>
24#include <libnl++/Socket.h>
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070025
26#include <linux/can.h>
chrisweirbee3d2c2019-11-19 10:23:37 -080027#include <linux/can/error.h>
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070028#include <linux/can/netlink.h>
chrisweirbee3d2c2019-11-19 10:23:37 -080029#include <linux/can/raw.h>
Tomasz Wasilczyk390c7112020-07-30 11:08:29 -070030#include <linux/rtnetlink.h>
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070031
Tomasz Wasilczyk55f21932019-12-20 09:20:24 -080032namespace android::netdevice::can {
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070033
chrisweirbee3d2c2019-11-19 10:23:37 -080034static constexpr can_err_mask_t kErrMask = CAN_ERR_MASK;
35
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070036base::unique_fd socket(const std::string& ifname) {
Tomasz Wasilczyk3ab105b2020-08-05 14:07:40 -070037 sockaddr_can addr = {};
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070038 addr.can_family = AF_CAN;
39 addr.can_ifindex = nametoindex(ifname);
40 if (addr.can_ifindex == 0) {
41 LOG(ERROR) << "Interface " << ifname << " doesn't exists";
42 return {};
43 }
44
45 base::unique_fd sock(::socket(PF_CAN, SOCK_RAW, CAN_RAW));
46 if (!sock.ok()) {
47 LOG(ERROR) << "Failed to create CAN socket";
48 return {};
49 }
50
chrisweirbee3d2c2019-11-19 10:23:37 -080051 if (setsockopt(sock.get(), SOL_CAN_RAW, CAN_RAW_ERR_FILTER, &kErrMask, sizeof(kErrMask)) < 0) {
chrisweir1173a722020-02-26 14:39:56 -080052 PLOG(ERROR) << "Can't receive error frames, CAN setsockpt failed";
chrisweirbee3d2c2019-11-19 10:23:37 -080053 return {};
54 }
55
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070056 if (0 != fcntl(sock.get(), F_SETFL, O_RDWR | O_NONBLOCK)) {
57 LOG(ERROR) << "Couldn't put CAN socket in non-blocking mode";
58 return {};
59 }
60
Tomasz Wasilczyk3ab105b2020-08-05 14:07:40 -070061 if (0 != bind(sock.get(), reinterpret_cast<sockaddr*>(&addr), sizeof(addr))) {
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070062 LOG(ERROR) << "Can't bind to CAN interface " << ifname;
63 return {};
64 }
65
66 return sock;
67}
68
69bool setBitrate(std::string ifname, uint32_t bitrate) {
Tomasz Wasilczyk3ab105b2020-08-05 14:07:40 -070070 can_bittiming bt = {};
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070071 bt.bitrate = bitrate;
72
Tomasz Wasilczyk3ab105b2020-08-05 14:07:40 -070073 nl::MessageFactory<ifinfomsg> req(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_ACK);
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070074
Tomasz Wasilczyk3ab105b2020-08-05 14:07:40 -070075 req->ifi_index = nametoindex(ifname);
76 if (req->ifi_index == 0) {
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070077 LOG(ERROR) << "Can't find interface " << ifname;
78 return false;
79 }
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070080
81 {
Tomasz Wasilczyk3ab105b2020-08-05 14:07:40 -070082 auto linkinfo = req.addNested(IFLA_LINKINFO);
83 req.add(IFLA_INFO_KIND, "can");
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070084 {
Tomasz Wasilczyk3ab105b2020-08-05 14:07:40 -070085 auto infodata = req.addNested(IFLA_INFO_DATA);
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070086 /* For CAN FD, it would require to add IFLA_CAN_DATA_BITTIMING
87 * and IFLA_CAN_CTRLMODE as well. */
Tomasz Wasilczyk3ab105b2020-08-05 14:07:40 -070088 req.add(IFLA_CAN_BITTIMING, bt);
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070089 }
90 }
91
Tomasz Wasilczyk66fc9392020-08-03 10:22:52 -070092 nl::Socket sock(NETLINK_ROUTE);
Tomasz Wasilczyk71396052020-08-04 16:21:39 -070093 return sock.send(req) && sock.receiveAck(req);
Tomasz Wasilczyk87329672019-07-12 11:43:00 -070094}
95
Tomasz Wasilczyk55f21932019-12-20 09:20:24 -080096} // namespace android::netdevice::can