Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 1 | /* |
| 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 Wasilczyk | ad10741 | 2020-05-29 16:32:43 -0700 | [diff] [blame] | 17 | #include <libnetdevice/can.h> |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 18 | |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 19 | #include "common.h" |
| 20 | |
| 21 | #include <android-base/logging.h> |
| 22 | #include <android-base/unique_fd.h> |
Tomasz Wasilczyk | 66fc939 | 2020-08-03 10:22:52 -0700 | [diff] [blame] | 23 | #include <libnl++/MessageFactory.h> |
| 24 | #include <libnl++/Socket.h> |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 25 | |
| 26 | #include <linux/can.h> |
chrisweir | bee3d2c | 2019-11-19 10:23:37 -0800 | [diff] [blame] | 27 | #include <linux/can/error.h> |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 28 | #include <linux/can/netlink.h> |
chrisweir | bee3d2c | 2019-11-19 10:23:37 -0800 | [diff] [blame] | 29 | #include <linux/can/raw.h> |
Tomasz Wasilczyk | 390c711 | 2020-07-30 11:08:29 -0700 | [diff] [blame] | 30 | #include <linux/rtnetlink.h> |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 31 | |
Tomasz Wasilczyk | 55f2193 | 2019-12-20 09:20:24 -0800 | [diff] [blame] | 32 | namespace android::netdevice::can { |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 33 | |
chrisweir | bee3d2c | 2019-11-19 10:23:37 -0800 | [diff] [blame] | 34 | static constexpr can_err_mask_t kErrMask = CAN_ERR_MASK; |
| 35 | |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 36 | base::unique_fd socket(const std::string& ifname) { |
Tomasz Wasilczyk | 3ab105b | 2020-08-05 14:07:40 -0700 | [diff] [blame^] | 37 | sockaddr_can addr = {}; |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 38 | 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 | |
chrisweir | bee3d2c | 2019-11-19 10:23:37 -0800 | [diff] [blame] | 51 | if (setsockopt(sock.get(), SOL_CAN_RAW, CAN_RAW_ERR_FILTER, &kErrMask, sizeof(kErrMask)) < 0) { |
chrisweir | 1173a72 | 2020-02-26 14:39:56 -0800 | [diff] [blame] | 52 | PLOG(ERROR) << "Can't receive error frames, CAN setsockpt failed"; |
chrisweir | bee3d2c | 2019-11-19 10:23:37 -0800 | [diff] [blame] | 53 | return {}; |
| 54 | } |
| 55 | |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 56 | 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 Wasilczyk | 3ab105b | 2020-08-05 14:07:40 -0700 | [diff] [blame^] | 61 | if (0 != bind(sock.get(), reinterpret_cast<sockaddr*>(&addr), sizeof(addr))) { |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 62 | LOG(ERROR) << "Can't bind to CAN interface " << ifname; |
| 63 | return {}; |
| 64 | } |
| 65 | |
| 66 | return sock; |
| 67 | } |
| 68 | |
| 69 | bool setBitrate(std::string ifname, uint32_t bitrate) { |
Tomasz Wasilczyk | 3ab105b | 2020-08-05 14:07:40 -0700 | [diff] [blame^] | 70 | can_bittiming bt = {}; |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 71 | bt.bitrate = bitrate; |
| 72 | |
Tomasz Wasilczyk | 3ab105b | 2020-08-05 14:07:40 -0700 | [diff] [blame^] | 73 | nl::MessageFactory<ifinfomsg> req(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_ACK); |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 74 | |
Tomasz Wasilczyk | 3ab105b | 2020-08-05 14:07:40 -0700 | [diff] [blame^] | 75 | req->ifi_index = nametoindex(ifname); |
| 76 | if (req->ifi_index == 0) { |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 77 | LOG(ERROR) << "Can't find interface " << ifname; |
| 78 | return false; |
| 79 | } |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 80 | |
| 81 | { |
Tomasz Wasilczyk | 3ab105b | 2020-08-05 14:07:40 -0700 | [diff] [blame^] | 82 | auto linkinfo = req.addNested(IFLA_LINKINFO); |
| 83 | req.add(IFLA_INFO_KIND, "can"); |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 84 | { |
Tomasz Wasilczyk | 3ab105b | 2020-08-05 14:07:40 -0700 | [diff] [blame^] | 85 | auto infodata = req.addNested(IFLA_INFO_DATA); |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 86 | /* For CAN FD, it would require to add IFLA_CAN_DATA_BITTIMING |
| 87 | * and IFLA_CAN_CTRLMODE as well. */ |
Tomasz Wasilczyk | 3ab105b | 2020-08-05 14:07:40 -0700 | [diff] [blame^] | 88 | req.add(IFLA_CAN_BITTIMING, bt); |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 89 | } |
| 90 | } |
| 91 | |
Tomasz Wasilczyk | 66fc939 | 2020-08-03 10:22:52 -0700 | [diff] [blame] | 92 | nl::Socket sock(NETLINK_ROUTE); |
Tomasz Wasilczyk | 7139605 | 2020-08-04 16:21:39 -0700 | [diff] [blame] | 93 | return sock.send(req) && sock.receiveAck(req); |
Tomasz Wasilczyk | 8732967 | 2019-07-12 11:43:00 -0700 | [diff] [blame] | 94 | } |
| 95 | |
Tomasz Wasilczyk | 55f2193 | 2019-12-20 09:20:24 -0800 | [diff] [blame] | 96 | } // namespace android::netdevice::can |