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Diffstat (limited to 'test/packetimpact/netdevs/netdevs.go')
| -rw-r--r-- | test/packetimpact/netdevs/netdevs.go | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/test/packetimpact/netdevs/netdevs.go b/test/packetimpact/netdevs/netdevs.go deleted file mode 100644 index 25dcfbf60..000000000 --- a/test/packetimpact/netdevs/netdevs.go +++ /dev/null @@ -1,122 +0,0 @@ -// Copyright 2020 The gVisor 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 netdevs contains utilities for working with network devices. -package netdevs - -import ( - "fmt" - "net" - "regexp" - "strconv" - "strings" - - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/header" -) - -// A DeviceInfo represents a network device. -type DeviceInfo struct { - ID uint32 - MAC net.HardwareAddr - IPv4Addr net.IP - IPv4Net *net.IPNet - IPv6Addr net.IP - IPv6Net *net.IPNet -} - -var ( - deviceLine = regexp.MustCompile(`^\s*(\d+): (\w+)`) - linkLine = regexp.MustCompile(`^\s*link/\w+ ([0-9a-fA-F:]+)`) - inetLine = regexp.MustCompile(`^\s*inet ([0-9./]+)`) - inet6Line = regexp.MustCompile(`^\s*inet6 ([0-9a-fA-F:/]+)`) -) - -// ParseDevicesWithRegex will parse the output with the given regexps to produce -// a map from device name to device information. It is assumed that deviceLine -// contains both a name and an ID. -func ParseDevicesWithRegex(cmdOutput string, deviceLine, linkLine, inetLine, inet6Line *regexp.Regexp) (map[string]DeviceInfo, error) { - var currentDevice string - var currentInfo DeviceInfo - deviceInfos := make(map[string]DeviceInfo) - for _, line := range strings.Split(cmdOutput, "\n") { - if m := deviceLine.FindStringSubmatch(line); m != nil { - if currentDevice != "" { - deviceInfos[currentDevice] = currentInfo - } - id, err := strconv.ParseUint(m[1], 10, 32) - if err != nil { - return nil, fmt.Errorf("parsing device ID %s: %w", m[1], err) - } - currentInfo = DeviceInfo{ID: uint32(id)} - currentDevice = m[2] - } else if m := linkLine.FindStringSubmatch(line); m != nil { - mac, err := net.ParseMAC(m[1]) - if err != nil { - return nil, err - } - currentInfo.MAC = mac - } else if m := inetLine.FindStringSubmatch(line); m != nil { - ipv4Addr, ipv4Net, err := net.ParseCIDR(m[1]) - if err != nil { - return nil, err - } - currentInfo.IPv4Addr = ipv4Addr - currentInfo.IPv4Net = ipv4Net - } else if m := inet6Line.FindStringSubmatch(line); m != nil { - ipv6Addr, ipv6Net, err := net.ParseCIDR(m[1]) - if err != nil { - return nil, err - } - currentInfo.IPv6Addr = ipv6Addr - currentInfo.IPv6Net = ipv6Net - } - } - if currentDevice != "" { - deviceInfos[currentDevice] = currentInfo - } - return deviceInfos, nil -} - -// ParseDevices parses the output from `ip addr show` into a map from device -// name to information about the device. -// -// Note: if multiple IPv6 addresses are assigned to a device, the last address -// displayed by `ip addr show` will be used. This is fine for packetimpact -// because we will always only have at most one IPv6 address assigned to each -// device. -func ParseDevices(cmdOutput string) (map[string]DeviceInfo, error) { - return ParseDevicesWithRegex(cmdOutput, deviceLine, linkLine, inetLine, inet6Line) -} - -// MACToIP converts the MAC address to an IPv6 link local address as described -// in RFC 4291 page 20: https://tools.ietf.org/html/rfc4291#page-20 -func MACToIP(mac net.HardwareAddr) net.IP { - addr := make([]byte, header.IPv6AddressSize) - addr[0] = 0xfe - addr[1] = 0x80 - header.EthernetAdddressToModifiedEUI64IntoBuf(tcpip.LinkAddress(mac), addr[8:]) - return net.IP(addr) -} - -// FindDeviceByIP finds a DeviceInfo and device name from an IP address in the -// output of ParseDevices. -func FindDeviceByIP(ip net.IP, devices map[string]DeviceInfo) (string, DeviceInfo, error) { - for dev, info := range devices { - if info.IPv4Addr.Equal(ip) { - return dev, info, nil - } - } - return "", DeviceInfo{}, fmt.Errorf("can't find %s on any interface", ip) -} |