1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481
|
// Copyright 2015 CNI authors
//
// 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.
package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net"
"os"
"path/filepath"
"runtime"
"strings"
"github.com/vishvananda/netlink"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/types/current"
"github.com/containernetworking/cni/pkg/version"
"github.com/containernetworking/plugins/pkg/ip"
"github.com/containernetworking/plugins/pkg/ipam"
"github.com/containernetworking/plugins/pkg/ns"
bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
)
const (
sysBusPCI = "/sys/bus/pci/devices"
)
// Array of different linux drivers bound to network device needed for DPDK
var userspaceDrivers = []string{"vfio-pci", "uio_pci_generic", "igb_uio"}
//NetConf for host-device config, look the README to learn how to use those parameters
type NetConf struct {
types.NetConf
Device string `json:"device"` // Device-Name, something like eth0 or can0 etc.
HWAddr string `json:"hwaddr"` // MAC Address of target network interface
KernelPath string `json:"kernelpath"` // Kernelpath of the device
PCIAddr string `json:"pciBusID"` // PCI Address of target network device
RuntimeConfig struct {
DeviceID string `json:"deviceID,omitempty"`
} `json:"runtimeConfig,omitempty"`
}
func init() {
// this ensures that main runs only on main thread (thread group leader).
// since namespace ops (unshare, setns) are done for a single thread, we
// must ensure that the goroutine does not jump from OS thread to thread
runtime.LockOSThread()
}
func loadConf(bytes []byte) (*NetConf, error) {
n := &NetConf{}
if err := json.Unmarshal(bytes, n); err != nil {
return nil, fmt.Errorf("failed to load netconf: %v", err)
}
if n.RuntimeConfig.DeviceID != "" {
// Override PCI device with the standardized DeviceID provided in Runtime Config.
n.PCIAddr = n.RuntimeConfig.DeviceID
}
if n.Device == "" && n.HWAddr == "" && n.KernelPath == "" && n.PCIAddr == "" {
return nil, fmt.Errorf(`specify either "device", "hwaddr", "kernelpath" or "pciBusID"`)
}
return n, nil
}
func cmdAdd(args *skel.CmdArgs) error {
cfg, err := loadConf(args.StdinData)
if err != nil {
return err
}
containerNs, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer containerNs.Close()
if len(cfg.PCIAddr) > 0 {
isDpdkMode, err := hasDpdkDriver(cfg.PCIAddr)
if err != nil {
return fmt.Errorf("error with host device: %v", err)
}
if isDpdkMode {
return types.PrintResult(¤t.Result{}, cfg.CNIVersion)
}
}
hostDev, err := getLink(cfg.Device, cfg.HWAddr, cfg.KernelPath, cfg.PCIAddr)
if err != nil {
return fmt.Errorf("failed to find host device: %v", err)
}
contDev, err := moveLinkIn(hostDev, containerNs, args.IfName)
if err != nil {
return fmt.Errorf("failed to move link %v", err)
}
var result *current.Result
// run the IPAM plugin and get back the config to apply
if cfg.IPAM.Type != "" {
r, err := ipam.ExecAdd(cfg.IPAM.Type, args.StdinData)
if err != nil {
return err
}
// Invoke ipam del if err to avoid ip leak
defer func() {
if err != nil {
ipam.ExecDel(cfg.IPAM.Type, args.StdinData)
}
}()
// Convert whatever the IPAM result was into the current Result type
result, err = current.NewResultFromResult(r)
if err != nil {
return err
}
if len(result.IPs) == 0 {
return errors.New("IPAM plugin returned missing IP config")
}
result.Interfaces = []*current.Interface{{
Name: contDev.Attrs().Name,
Mac: contDev.Attrs().HardwareAddr.String(),
Sandbox: containerNs.Path(),
}}
for _, ipc := range result.IPs {
// All addresses apply to the container interface (move from host)
ipc.Interface = current.Int(0)
}
err = containerNs.Do(func(_ ns.NetNS) error {
if err := ipam.ConfigureIface(args.IfName, result); err != nil {
return err
}
return nil
})
if err != nil {
return err
}
result.DNS = cfg.DNS
return types.PrintResult(result, cfg.CNIVersion)
}
return printLink(contDev, cfg.CNIVersion, containerNs)
}
func cmdDel(args *skel.CmdArgs) error {
cfg, err := loadConf(args.StdinData)
if err != nil {
return err
}
if args.Netns == "" {
return nil
}
containerNs, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer containerNs.Close()
if len(cfg.PCIAddr) > 0 {
isDpdkMode, err := hasDpdkDriver(cfg.PCIAddr)
if err != nil {
return fmt.Errorf("error with host device: %v", err)
}
if isDpdkMode {
return nil
}
}
if err := moveLinkOut(containerNs, args.IfName); err != nil {
return err
}
if cfg.IPAM.Type != "" {
if err := ipam.ExecDel(cfg.IPAM.Type, args.StdinData); err != nil {
return err
}
}
return nil
}
func moveLinkIn(hostDev netlink.Link, containerNs ns.NetNS, ifName string) (netlink.Link, error) {
if err := netlink.LinkSetNsFd(hostDev, int(containerNs.Fd())); err != nil {
return nil, err
}
var contDev netlink.Link
if err := containerNs.Do(func(_ ns.NetNS) error {
var err error
contDev, err = netlink.LinkByName(hostDev.Attrs().Name)
if err != nil {
return fmt.Errorf("failed to find %q: %v", hostDev.Attrs().Name, err)
}
// Devices can be renamed only when down
if err = netlink.LinkSetDown(contDev); err != nil {
return fmt.Errorf("failed to set %q down: %v", hostDev.Attrs().Name, err)
}
// Save host device name into the container device's alias property
if err := netlink.LinkSetAlias(contDev, hostDev.Attrs().Name); err != nil {
return fmt.Errorf("failed to set alias to %q: %v", hostDev.Attrs().Name, err)
}
// Rename container device to respect args.IfName
if err := netlink.LinkSetName(contDev, ifName); err != nil {
return fmt.Errorf("failed to rename device %q to %q: %v", hostDev.Attrs().Name, ifName, err)
}
// Retrieve link again to get up-to-date name and attributes
contDev, err = netlink.LinkByName(ifName)
if err != nil {
return fmt.Errorf("failed to find %q: %v", ifName, err)
}
return nil
}); err != nil {
return nil, err
}
return contDev, nil
}
func moveLinkOut(containerNs ns.NetNS, ifName string) error {
defaultNs, err := ns.GetCurrentNS()
if err != nil {
return err
}
defer defaultNs.Close()
return containerNs.Do(func(_ ns.NetNS) error {
dev, err := netlink.LinkByName(ifName)
if err != nil {
return fmt.Errorf("failed to find %q: %v", ifName, err)
}
// Devices can be renamed only when down
if err = netlink.LinkSetDown(dev); err != nil {
return fmt.Errorf("failed to set %q down: %v", ifName, err)
}
// Rename device to it's original name
if err = netlink.LinkSetName(dev, dev.Attrs().Alias); err != nil {
return fmt.Errorf("failed to restore %q to original name %q: %v", ifName, dev.Attrs().Alias, err)
}
defer func() {
if err != nil {
// if moving device to host namespace fails, we should revert device name
// to ifName to make sure that device can be found in retries
_ = netlink.LinkSetName(dev, ifName)
}
}()
if err = netlink.LinkSetNsFd(dev, int(defaultNs.Fd())); err != nil {
return fmt.Errorf("failed to move %q to host netns: %v", dev.Attrs().Alias, err)
}
return nil
})
}
func hasDpdkDriver(pciaddr string) (bool, error) {
driverLink := filepath.Join(sysBusPCI, pciaddr, "driver")
driverPath, err := filepath.EvalSymlinks(driverLink)
if err != nil {
return false, err
}
driverStat, err := os.Stat(driverPath)
if err != nil {
return false, err
}
driverName := driverStat.Name()
for _, drv := range userspaceDrivers {
if driverName == drv {
return true, nil
}
}
return false, nil
}
func printLink(dev netlink.Link, cniVersion string, containerNs ns.NetNS) error {
result := current.Result{
CNIVersion: current.ImplementedSpecVersion,
Interfaces: []*current.Interface{
{
Name: dev.Attrs().Name,
Mac: dev.Attrs().HardwareAddr.String(),
Sandbox: containerNs.Path(),
},
},
}
return types.PrintResult(&result, cniVersion)
}
func getLink(devname, hwaddr, kernelpath, pciaddr string) (netlink.Link, error) {
links, err := netlink.LinkList()
if err != nil {
return nil, fmt.Errorf("failed to list node links: %v", err)
}
if len(devname) > 0 {
return netlink.LinkByName(devname)
} else if len(hwaddr) > 0 {
hwAddr, err := net.ParseMAC(hwaddr)
if err != nil {
return nil, fmt.Errorf("failed to parse MAC address %q: %v", hwaddr, err)
}
for _, link := range links {
if bytes.Equal(link.Attrs().HardwareAddr, hwAddr) {
return link, nil
}
}
} else if len(kernelpath) > 0 {
if !filepath.IsAbs(kernelpath) || !strings.HasPrefix(kernelpath, "/sys/devices/") {
return nil, fmt.Errorf("kernel device path %q must be absolute and begin with /sys/devices/", kernelpath)
}
netDir := filepath.Join(kernelpath, "net")
files, err := ioutil.ReadDir(netDir)
if err != nil {
return nil, fmt.Errorf("failed to find network devices at %q", netDir)
}
// Grab the first device from eg /sys/devices/pci0000:00/0000:00:19.0/net
for _, file := range files {
// Make sure it's really an interface
for _, l := range links {
if file.Name() == l.Attrs().Name {
return l, nil
}
}
}
} else if len(pciaddr) > 0 {
netDir := filepath.Join(sysBusPCI, pciaddr, "net")
if _, err := os.Lstat(netDir); err != nil {
virtioNetDir := filepath.Join(sysBusPCI, pciaddr, "virtio*", "net")
matches, err := filepath.Glob(virtioNetDir)
if matches == nil || err != nil {
return nil, fmt.Errorf("no net directory under pci device %s", pciaddr)
}
netDir = matches[0]
}
fInfo, err := ioutil.ReadDir(netDir)
if err != nil {
return nil, fmt.Errorf("failed to read net directory %s: %q", netDir, err)
}
if len(fInfo) > 0 {
return netlink.LinkByName(fInfo[0].Name())
}
return nil, fmt.Errorf("failed to find device name for pci address %s", pciaddr)
}
return nil, fmt.Errorf("failed to find physical interface")
}
func main() {
skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("host-device"))
}
func cmdCheck(args *skel.CmdArgs) error {
cfg, err := loadConf(args.StdinData)
if err != nil {
return err
}
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer netns.Close()
// run the IPAM plugin and get back the config to apply
if cfg.IPAM.Type != "" {
err = ipam.ExecCheck(cfg.IPAM.Type, args.StdinData)
if err != nil {
return err
}
}
// Parse previous result.
if cfg.NetConf.RawPrevResult == nil {
return fmt.Errorf("Required prevResult missing")
}
if err := version.ParsePrevResult(&cfg.NetConf); err != nil {
return err
}
result, err := current.NewResultFromResult(cfg.PrevResult)
if err != nil {
return err
}
var contMap current.Interface
// Find interfaces for name we know, that of host-device inside container
for _, intf := range result.Interfaces {
if args.IfName == intf.Name {
if args.Netns == intf.Sandbox {
contMap = *intf
continue
}
}
}
// The namespace must be the same as what was configured
if args.Netns != contMap.Sandbox {
return fmt.Errorf("Sandbox in prevResult %s doesn't match configured netns: %s",
contMap.Sandbox, args.Netns)
}
//
// Check prevResults for ips, routes and dns against values found in the container
if err := netns.Do(func(_ ns.NetNS) error {
// Check interface against values found in the container
err := validateCniContainerInterface(contMap)
if err != nil {
return err
}
err = ip.ValidateExpectedInterfaceIPs(args.IfName, result.IPs)
if err != nil {
return err
}
err = ip.ValidateExpectedRoute(result.Routes)
if err != nil {
return err
}
return nil
}); err != nil {
return err
}
//
return nil
}
func validateCniContainerInterface(intf current.Interface) error {
var link netlink.Link
var err error
if intf.Name == "" {
return fmt.Errorf("Container interface name missing in prevResult: %v", intf.Name)
}
link, err = netlink.LinkByName(intf.Name)
if err != nil {
return fmt.Errorf("Container Interface name in prevResult: %s not found", intf.Name)
}
if intf.Sandbox == "" {
return fmt.Errorf("Error: Container interface %s should not be in host namespace", link.Attrs().Name)
}
if intf.Mac != "" {
if intf.Mac != link.Attrs().HardwareAddr.String() {
return fmt.Errorf("Interface %s Mac %s doesn't match container Mac: %s", intf.Name, intf.Mac, link.Attrs().HardwareAddr)
}
}
return nil
}
|