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Merge pull request #540 from Mirantis/ivan4th/tapfdsource-test
Add TapFDSource test
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| /* | ||
| Copyright 2017 Mirantis | ||
| 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 nettools | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "os" | ||
| "syscall" | ||
| "unsafe" | ||
|
|
||
| "github.com/vishvananda/netlink" | ||
| ) | ||
|
|
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| // OpenTAP opens a tap device and returns an os.File for it | ||
| func OpenTAP(devName string) (*os.File, error) { | ||
| tapFile, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| var req ifReq | ||
|
|
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| // set IFF_NO_PI to not provide packet information | ||
| // If flag IFF_NO_PI is not set each frame format is: | ||
| // Flags [2 bytes] | ||
| // Proto [2 bytes] | ||
| // Raw protocol ethernet frame. | ||
| // This extra 4-byte header breaks connectivity as in this case kernel truncates initial package | ||
| req.Flags = uint16(syscall.IFF_TAP | syscall.IFF_NO_PI | syscall.IFF_ONE_QUEUE) | ||
| copy(req.Name[:15], devName) | ||
| _, _, errno := syscall.Syscall(syscall.SYS_IOCTL, tapFile.Fd(), uintptr(syscall.TUNSETIFF), uintptr(unsafe.Pointer(&req))) | ||
| if errno != 0 { | ||
| return nil, fmt.Errorf("tuntap IOCTL TUNSETIFF failed, errno %v", errno) | ||
| } | ||
| return tapFile, nil | ||
| } | ||
|
|
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| // CreateTAP sets up a tap link and brings it up | ||
| func CreateTAP(devName string, mtu int) (netlink.Link, error) { | ||
| tap := &netlink.Tuntap{ | ||
| LinkAttrs: netlink.LinkAttrs{ | ||
| Name: devName, | ||
| Flags: net.FlagUp, | ||
| MTU: mtu, | ||
| }, | ||
| Mode: netlink.TUNTAP_MODE_TAP, | ||
| } | ||
|
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| if err := netlink.LinkAdd(tap); err != nil { | ||
| return nil, fmt.Errorf("failed to create tap interface: %v", err) | ||
| } | ||
|
|
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| if err := netlink.LinkSetUp(tap); err != nil { | ||
| return nil, fmt.Errorf("failed to set %q up: %v", devName, err) | ||
| } | ||
|
|
||
| return tap, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,8 @@ | ||
| This directory contains network tests that make use of network | ||
| namespaces and should not be mixed with non-network-namespace-aware | ||
| tests. | ||
| This directory contains the tests that examine Virtlet networking | ||
| by running a DHCP client and sending actual network packets. | ||
|
|
||
| For more info, see containernetworking/cni#262, vishvananda/netns#17 | ||
| etc. | ||
| Note that before we switch to Go 1.10, there may be test flakes | ||
| because some goroutines may inherit a network namespace from other | ||
| goroutines unintentionally. Running at least some of the network tests | ||
| separately may help reduce the impact of this problem. For more info, | ||
| see containernetworking/cni#262, vishvananda/netns#17, golang/go#20676 |
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