Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 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 | |
| 17 | #include <errno.h> |
| 18 | #include <string.h> |
| 19 | |
| 20 | #include <arpa/inet.h> |
| 21 | #include <netdb.h> |
| 22 | #include <sys/socket.h> |
| 23 | |
| 24 | #include <glog/logging.h> |
| 25 | #include <fstream> |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 26 | #include <limits> |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 27 | #include <sstream> |
| 28 | #include "common/libs/fs/shared_select.h" |
| 29 | |
| 30 | #include "common/libs/fs/shared_fd.h" |
Jorge E. Moreira | d843066 | 2018-07-22 23:52:33 -0700 | [diff] [blame] | 31 | #include "host/commands/virtual_usb_manager/usbip/vhci_instrument.h" |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 32 | |
| 33 | namespace vadb { |
| 34 | namespace usbip { |
| 35 | namespace { |
| 36 | // Device ID is specified as a concatenated pair of BUS and DEVICE id. |
| 37 | // Since we only export one device and our server doesn't care much about |
| 38 | // its number, we use the default value of BUS=1 and DEVICE=1. |
| 39 | // This can be set to something else and should still work, as long as |
| 40 | // numbers are valid in USB sense. |
| 41 | constexpr uint32_t kDefaultDeviceID = (1 << 16) | 1; |
| 42 | |
| 43 | // Request Highspeed configuration. Superspeed isn't supported by vhci. |
| 44 | // Supported configurations are: |
| 45 | // 4 -> wireless |
| 46 | // 3 -> highspeed |
| 47 | // 2 -> full speed |
| 48 | // 1 -> low speed |
| 49 | // Please refer to the Kernel source tree in the following locations: |
| 50 | // include/uapi/linux/usb/ch9.h |
| 51 | // drivers/usb/usbip/vhci_sysfs.c |
| 52 | constexpr uint32_t kDefaultDeviceSpeed = 3; |
| 53 | |
| 54 | // Subsystem and device type where VHCI driver is located. |
Tomasz Wiszkowski | e18ee64 | 2017-10-31 12:53:42 -0700 | [diff] [blame] | 55 | const char* const kVHCIPlatformPaths[] = { |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 56 | "/sys/devices/platform/vhci_hcd", |
| 57 | "/sys/devices/platform/vhci_hcd.1", |
Tomasz Wiszkowski | e18ee64 | 2017-10-31 12:53:42 -0700 | [diff] [blame] | 58 | }; |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 59 | |
| 60 | // Control messages. |
| 61 | // Attach tells thread to attach remote device. |
| 62 | // Detach tells thread to detach remote device. |
| 63 | using ControlMsgType = uint8_t; |
| 64 | constexpr ControlMsgType kControlAttach = 'A'; |
| 65 | constexpr ControlMsgType kControlDetach = 'D'; |
| 66 | constexpr ControlMsgType kControlExit = 'E'; |
| 67 | |
| 68 | // Used with EPOLL as epoll_data to determine event type. |
| 69 | enum EpollEventType { |
| 70 | kControlEvent, |
| 71 | kVHCIEvent, |
| 72 | }; |
| 73 | |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 74 | } // anonymous namespace |
| 75 | |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 76 | VHCIInstrument::VHCIInstrument(int port, const std::string& name) |
| 77 | : name_(name), port_{port} {} |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 78 | |
| 79 | VHCIInstrument::~VHCIInstrument() { |
| 80 | control_write_end_->Write(&kControlExit, sizeof(kControlExit)); |
Ryan Haining | b8afc41 | 2018-04-07 09:49:28 -0700 | [diff] [blame] | 81 | attach_thread_.join(); |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | bool VHCIInstrument::Init() { |
Greg Hartman | 153b106 | 2017-11-11 12:09:21 -0800 | [diff] [blame] | 85 | cvd::SharedFD::Pipe(&control_read_end_, &control_write_end_); |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 86 | |
Tomasz Wiszkowski | e18ee64 | 2017-10-31 12:53:42 -0700 | [diff] [blame] | 87 | struct stat buf; |
| 88 | for (const auto* path : kVHCIPlatformPaths) { |
| 89 | if (stat(path, &buf) == 0) { |
| 90 | syspath_ = path; |
| 91 | break; |
| 92 | } |
| 93 | } |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 94 | |
Tomasz Wiszkowski | e18ee64 | 2017-10-31 12:53:42 -0700 | [diff] [blame] | 95 | if (syspath_.empty()) { |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 96 | LOG(ERROR) << "VHCI not available. Is the driver loaded?"; |
| 97 | LOG(ERROR) << "Try: sudo modprobe vhci_hcd"; |
| 98 | LOG(ERROR) << "The driver is part of linux-image-extra-`uname -r` package"; |
| 99 | return false; |
| 100 | } |
| 101 | |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 102 | if (!VerifyPortIsFree()) { |
| 103 | LOG(ERROR) << "Trying to use VHCI port " << port_ << " but it is already in" |
| 104 | << " use."; |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 105 | return false; |
| 106 | } |
| 107 | |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 108 | LOG(INFO) << "Using VHCI port " << port_; |
Ryan Haining | b8afc41 | 2018-04-07 09:49:28 -0700 | [diff] [blame] | 109 | attach_thread_ = std::thread([this] { AttachThread(); }); |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 110 | return true; |
| 111 | } |
| 112 | |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 113 | bool VHCIInstrument::VerifyPortIsFree() const { |
| 114 | std::ifstream status_file(syspath_ + "/status"); |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 115 | |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 116 | if (!status_file.good()) { |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 117 | LOG(ERROR) << "Could not open usb-ip status file."; |
| 118 | return false; |
| 119 | } |
| 120 | |
| 121 | // Skip past the header line. |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 122 | status_file.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 123 | |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 124 | while (true) { |
| 125 | // Port status values deducted from /sys/devices/platform/vhci_hcd/status |
| 126 | // kVHCIPortFree indicates the port is not currently in use. |
| 127 | constexpr static int kVHCIStatusPortFree = 4; |
| 128 | |
| 129 | int port{}; |
| 130 | int status{}; |
| 131 | status_file >> port >> status; |
| 132 | if (!status_file.good()) { |
| 133 | break; |
| 134 | } |
| 135 | |
| 136 | status_file.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); |
| 137 | if (port_ == port) { |
| 138 | return status == kVHCIStatusPortFree; |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 139 | } |
| 140 | } |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 141 | LOG(ERROR) << "Couldn't find status for VHCI port " << port_; |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 142 | return false; |
| 143 | } |
| 144 | |
| 145 | void VHCIInstrument::TriggerAttach() { |
| 146 | control_write_end_->Write(&kControlAttach, sizeof(kControlAttach)); |
| 147 | } |
| 148 | |
| 149 | void VHCIInstrument::TriggerDetach() { |
| 150 | control_write_end_->Write(&kControlDetach, sizeof(kControlDetach)); |
| 151 | } |
| 152 | |
| 153 | void VHCIInstrument::AttachThread() { |
Greg Hartman | 153b106 | 2017-11-11 12:09:21 -0800 | [diff] [blame] | 154 | cvd::SharedFD epoll = cvd::SharedFD::Epoll(); |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 155 | // Trigger attach upon start. |
| 156 | bool want_attach = true; |
| 157 | // Operation is pending on read. |
| 158 | bool is_pending = false; |
| 159 | |
| 160 | epoll_event control_event; |
| 161 | control_event.events = EPOLLIN; |
| 162 | control_event.data.u64 = kControlEvent; |
| 163 | epoll_event vhci_event; |
| 164 | vhci_event.events = EPOLLRDHUP | EPOLLONESHOT; |
| 165 | vhci_event.data.u64 = kVHCIEvent; |
| 166 | |
| 167 | epoll->EpollCtl(EPOLL_CTL_ADD, control_read_end_, &control_event); |
| 168 | while (true) { |
| 169 | if (vhci_socket_->IsOpen()) { |
| 170 | epoll->EpollCtl(EPOLL_CTL_ADD, vhci_socket_, &vhci_event); |
| 171 | } |
| 172 | |
| 173 | epoll_event found_event{}; |
| 174 | ControlMsgType request_type; |
| 175 | |
| 176 | if (epoll->EpollWait(&found_event, 1, 1000)) { |
| 177 | switch (found_event.data.u64) { |
| 178 | case kControlEvent: |
| 179 | control_read_end_->Read(&request_type, sizeof(request_type)); |
| 180 | is_pending = true; |
| 181 | want_attach = request_type == kControlAttach; |
| 182 | LOG(INFO) << (want_attach ? "Attach" : "Detach") << " triggered."; |
| 183 | break; |
| 184 | case kVHCIEvent: |
Greg Hartman | 153b106 | 2017-11-11 12:09:21 -0800 | [diff] [blame] | 185 | vhci_socket_ = cvd::SharedFD(); |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 186 | // Only re-establish VHCI if it was already established before. |
| 187 | is_pending = want_attach; |
| 188 | // Do not immediately fall into attach cycle. It will likely complete |
| 189 | // before VHCI finishes deregistering this callback. |
| 190 | continue; |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | // Make an attempt to re-attach. If successful, clear pending attach flag. |
| 195 | if (is_pending) { |
| 196 | if (want_attach && Attach()) { |
| 197 | is_pending = false; |
| 198 | } else if (!want_attach && Detach()) { |
| 199 | is_pending = false; |
| 200 | } else { |
| 201 | LOG(INFO) << (want_attach ? "Attach" : "Detach") << " unsuccessful. " |
| 202 | << "Will re-try."; |
| 203 | sleep(1); |
| 204 | } |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | bool VHCIInstrument::Detach() { |
| 210 | std::stringstream result; |
| 211 | result << port_; |
| 212 | std::ofstream detach(syspath_ + "/detach"); |
| 213 | |
| 214 | if (!detach.is_open()) { |
| 215 | LOG(WARNING) << "Could not open VHCI detach file."; |
| 216 | return false; |
| 217 | } |
| 218 | detach << result.str(); |
| 219 | return detach.rdstate() == std::ios_base::goodbit; |
| 220 | } |
| 221 | |
| 222 | bool VHCIInstrument::Attach() { |
| 223 | if (!vhci_socket_->IsOpen()) { |
| 224 | vhci_socket_ = |
Greg Hartman | 153b106 | 2017-11-11 12:09:21 -0800 | [diff] [blame] | 225 | cvd::SharedFD::SocketLocalClient(name_.c_str(), true, SOCK_STREAM); |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 226 | if (!vhci_socket_->IsOpen()) return false; |
| 227 | } |
| 228 | |
| 229 | int sys_fd = vhci_socket_->UNMANAGED_Dup(); |
| 230 | bool success = false; |
| 231 | |
| 232 | { |
| 233 | std::stringstream result; |
| 234 | result << port_ << ' ' << sys_fd << ' ' << kDefaultDeviceID << ' ' |
| 235 | << kDefaultDeviceSpeed; |
| 236 | std::string path = syspath_ + "/attach"; |
| 237 | std::ofstream attach(path); |
| 238 | |
| 239 | if (!attach.is_open()) { |
| 240 | LOG(WARNING) << "Could not open VHCI attach file " << path << " (" |
| 241 | << strerror(errno) << ")"; |
| 242 | close(sys_fd); |
| 243 | return false; |
| 244 | } |
| 245 | attach << result.str(); |
| 246 | |
| 247 | // It is unclear whether duplicate FD should remain open or not. There are |
| 248 | // cases supporting both assumptions, likely related to kernel version. |
| 249 | // Kernel 4.10 is having problems communicating with USB/IP server if the |
Ryan Haining | dd0dcfe | 2018-05-16 13:55:20 -0700 | [diff] [blame] | 250 | // socket is closed after it's passed to kernel. It is a clear indication |
| 251 | // that the kernel requires the socket to be kept open. |
Greg Hartman | 92045f6 | 2017-10-31 17:12:24 -0700 | [diff] [blame] | 252 | success = attach.rdstate() == std::ios_base::goodbit; |
| 253 | // Make sure everything was written and flushed. This happens when we close |
| 254 | // the ofstream attach. |
| 255 | } |
| 256 | |
| 257 | close(sys_fd); |
| 258 | return success; |
| 259 | } |
| 260 | |
| 261 | } // namespace usbip |
| 262 | } // namespace vadb |